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Merge branch 'linus' into x86/memory-corruption-check
[deliverable/linux.git] / drivers / net / wireless / iwlwifi / iwl-agn-rs.c
1 /******************************************************************************
2 *
3 * Copyright(c) 2005 - 2008 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 * James P. Ketrenos <ipw2100-admin@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 #include "iwl-helpers.h"
42
43 #define RS_NAME "iwl-agn-rs"
44
45 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
46 #define IWL_NUMBER_TRY 1
47 #define IWL_HT_NUMBER_TRY 3
48
49 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
50 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
51 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
52
53 /* max time to accum history 2 seconds */
54 #define IWL_RATE_SCALE_FLUSH_INTVL (2*HZ)
55
56 static u8 rs_ht_to_legacy[] = {
57 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
58 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
59 IWL_RATE_6M_INDEX,
60 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
61 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
62 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
63 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
64 };
65
66 static const u8 ant_toggle_lookup[] = {
67 /*ANT_NONE -> */ ANT_NONE,
68 /*ANT_A -> */ ANT_B,
69 /*ANT_B -> */ ANT_C,
70 /*ANT_AB -> */ ANT_BC,
71 /*ANT_C -> */ ANT_A,
72 /*ANT_AC -> */ ANT_AB,
73 /*ANT_BC -> */ ANT_AC,
74 /*ANT_ABC -> */ ANT_ABC,
75 };
76
77 /**
78 * struct iwl_rate_scale_data -- tx success history for one rate
79 */
80 struct iwl_rate_scale_data {
81 u64 data; /* bitmap of successful frames */
82 s32 success_counter; /* number of frames successful */
83 s32 success_ratio; /* per-cent * 128 */
84 s32 counter; /* number of frames attempted */
85 s32 average_tpt; /* success ratio * expected throughput */
86 unsigned long stamp;
87 };
88
89 /**
90 * struct iwl_scale_tbl_info -- tx params and success history for all rates
91 *
92 * There are two of these in struct iwl_lq_sta,
93 * one for "active", and one for "search".
94 */
95 struct iwl_scale_tbl_info {
96 enum iwl_table_type lq_type;
97 u8 ant_type;
98 u8 is_SGI; /* 1 = short guard interval */
99 u8 is_fat; /* 1 = 40 MHz channel width */
100 u8 is_dup; /* 1 = duplicated data streams */
101 u8 action; /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
102 s32 *expected_tpt; /* throughput metrics; expected_tpt_G, etc. */
103 u32 current_rate; /* rate_n_flags, uCode API format */
104 struct iwl_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
105 };
106
107 struct iwl_traffic_load {
108 unsigned long time_stamp; /* age of the oldest statistics */
109 u32 packet_count[TID_QUEUE_MAX_SIZE]; /* packet count in this time
110 * slice */
111 u32 total; /* total num of packets during the
112 * last TID_MAX_TIME_DIFF */
113 u8 queue_count; /* number of queues that has
114 * been used since the last cleanup */
115 u8 head; /* start of the circular buffer */
116 };
117
118 /**
119 * struct iwl_lq_sta -- driver's rate scaling private structure
120 *
121 * Pointer to this gets passed back and forth between driver and mac80211.
122 */
123 struct iwl_lq_sta {
124 u8 active_tbl; /* index of active table, range 0-1 */
125 u8 enable_counter; /* indicates HT mode */
126 u8 stay_in_tbl; /* 1: disallow, 0: allow search for new mode */
127 u8 search_better_tbl; /* 1: currently trying alternate mode */
128 s32 last_tpt;
129
130 /* The following determine when to search for a new mode */
131 u32 table_count_limit;
132 u32 max_failure_limit; /* # failed frames before new search */
133 u32 max_success_limit; /* # successful frames before new search */
134 u32 table_count;
135 u32 total_failed; /* total failed frames, any/all rates */
136 u32 total_success; /* total successful frames, any/all rates */
137 u32 flush_timer; /* time staying in mode before new search */
138
139 u8 action_counter; /* # mode-switch actions tried */
140 u8 is_green;
141 u8 is_dup;
142 enum ieee80211_band band;
143 u8 ibss_sta_added;
144
145 /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
146 u32 supp_rates;
147 u16 active_legacy_rate;
148 u16 active_siso_rate;
149 u16 active_mimo2_rate;
150 u16 active_mimo3_rate;
151 u16 active_rate_basic;
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 spearate 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 __le16 fc = hdr->frame_control;
285 u8 tid;
286
287 if (ieee80211_is_data_qos(fc)) {
288 u8 *qc = ieee80211_get_qos_ctl(hdr);
289 tid = qc[0] & 0xf;
290 } else
291 return MAX_TID_COUNT;
292
293 tl = &lq_data->load[tid];
294
295 curr_time -= curr_time % TID_ROUND_VALUE;
296
297 /* Happens only for the first packet. Initialize the data */
298 if (!(tl->queue_count)) {
299 tl->total = 1;
300 tl->time_stamp = curr_time;
301 tl->queue_count = 1;
302 tl->head = 0;
303 tl->packet_count[0] = 1;
304 return MAX_TID_COUNT;
305 }
306
307 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
308 index = time_diff / TID_QUEUE_CELL_SPACING;
309
310 /* The history is too long: remove data that is older than */
311 /* TID_MAX_TIME_DIFF */
312 if (index >= TID_QUEUE_MAX_SIZE)
313 rs_tl_rm_old_stats(tl, curr_time);
314
315 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
316 tl->packet_count[index] = tl->packet_count[index] + 1;
317 tl->total = tl->total + 1;
318
319 if ((index + 1) > tl->queue_count)
320 tl->queue_count = index + 1;
321
322 return tid;
323 }
324
325 /*
326 get the traffic load value for tid
327 */
328 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
329 {
330 u32 curr_time = jiffies_to_msecs(jiffies);
331 u32 time_diff;
332 s32 index;
333 struct iwl_traffic_load *tl = NULL;
334
335 if (tid >= TID_MAX_LOAD_COUNT)
336 return 0;
337
338 tl = &(lq_data->load[tid]);
339
340 curr_time -= curr_time % TID_ROUND_VALUE;
341
342 if (!(tl->queue_count))
343 return 0;
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 return tl->total;
354 }
355
356 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
357 struct iwl_lq_sta *lq_data, u8 tid,
358 struct ieee80211_sta *sta)
359 {
360 DECLARE_MAC_BUF(mac);
361
362 if (rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
363 IWL_DEBUG_HT("Starting Tx agg: STA: %s tid: %d\n",
364 print_mac(mac, sta->addr), tid);
365 ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
366 }
367 }
368
369 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
370 struct iwl_lq_sta *lq_data,
371 struct ieee80211_sta *sta)
372 {
373 if ((tid < TID_MAX_LOAD_COUNT))
374 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
375 else if (tid == IWL_AGG_ALL_TID)
376 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
377 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
378 }
379
380 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
381 {
382 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
383 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
384 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
385 }
386
387 /**
388 * rs_collect_tx_data - Update the success/failure sliding window
389 *
390 * We keep a sliding window of the last 62 packets transmitted
391 * at this rate. window->data contains the bitmask of successful
392 * packets.
393 */
394 static int rs_collect_tx_data(struct iwl_rate_scale_data *windows,
395 int scale_index, s32 tpt, int retries,
396 int successes)
397 {
398 struct iwl_rate_scale_data *window = NULL;
399 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
400 s32 fail_count;
401
402 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
403 return -EINVAL;
404
405 /* Select data for current tx bit rate */
406 window = &(windows[scale_index]);
407
408 /*
409 * Keep track of only the latest 62 tx frame attempts in this rate's
410 * history window; anything older isn't really relevant any more.
411 * If we have filled up the sliding window, drop the oldest attempt;
412 * if the oldest attempt (highest bit in bitmap) shows "success",
413 * subtract "1" from the success counter (this is the main reason
414 * we keep these bitmaps!).
415 */
416 while (retries > 0) {
417 if (window->counter >= IWL_RATE_MAX_WINDOW) {
418
419 /* remove earliest */
420 window->counter = IWL_RATE_MAX_WINDOW - 1;
421
422 if (window->data & mask) {
423 window->data &= ~mask;
424 window->success_counter--;
425 }
426 }
427
428 /* Increment frames-attempted counter */
429 window->counter++;
430
431 /* Shift bitmap by one frame (throw away oldest history),
432 * OR in "1", and increment "success" if this
433 * frame was successful. */
434 window->data <<= 1;
435 if (successes > 0) {
436 window->success_counter++;
437 window->data |= 0x1;
438 successes--;
439 }
440
441 retries--;
442 }
443
444 /* Calculate current success ratio, avoid divide-by-0! */
445 if (window->counter > 0)
446 window->success_ratio = 128 * (100 * window->success_counter)
447 / window->counter;
448 else
449 window->success_ratio = IWL_INVALID_VALUE;
450
451 fail_count = window->counter - window->success_counter;
452
453 /* Calculate average throughput, if we have enough history. */
454 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
455 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
456 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
457 else
458 window->average_tpt = IWL_INVALID_VALUE;
459
460 /* Tag this window as having been updated */
461 window->stamp = jiffies;
462
463 return 0;
464 }
465
466 /*
467 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
468 */
469 /* FIXME:RS:remove this function and put the flags statically in the table */
470 static u32 rate_n_flags_from_tbl(struct iwl_scale_tbl_info *tbl,
471 int index, u8 use_green)
472 {
473 u32 rate_n_flags = 0;
474
475 if (is_legacy(tbl->lq_type)) {
476 rate_n_flags = iwl_rates[index].plcp;
477 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
478 rate_n_flags |= RATE_MCS_CCK_MSK;
479
480 } else if (is_Ht(tbl->lq_type)) {
481 if (index > IWL_LAST_OFDM_RATE) {
482 IWL_ERROR("invalid HT rate index %d\n", index);
483 index = IWL_LAST_OFDM_RATE;
484 }
485 rate_n_flags = RATE_MCS_HT_MSK;
486
487 if (is_siso(tbl->lq_type))
488 rate_n_flags |= iwl_rates[index].plcp_siso;
489 else if (is_mimo2(tbl->lq_type))
490 rate_n_flags |= iwl_rates[index].plcp_mimo2;
491 else
492 rate_n_flags |= iwl_rates[index].plcp_mimo3;
493 } else {
494 IWL_ERROR("Invalid tbl->lq_type %d\n", tbl->lq_type);
495 }
496
497 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
498 RATE_MCS_ANT_ABC_MSK);
499
500 if (is_Ht(tbl->lq_type)) {
501 if (tbl->is_fat) {
502 if (tbl->is_dup)
503 rate_n_flags |= RATE_MCS_DUP_MSK;
504 else
505 rate_n_flags |= RATE_MCS_FAT_MSK;
506 }
507 if (tbl->is_SGI)
508 rate_n_flags |= RATE_MCS_SGI_MSK;
509
510 if (use_green) {
511 rate_n_flags |= RATE_MCS_GF_MSK;
512 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
513 rate_n_flags &= ~RATE_MCS_SGI_MSK;
514 IWL_ERROR("GF was set with SGI:SISO\n");
515 }
516 }
517 }
518 return rate_n_flags;
519 }
520
521 /*
522 * Interpret uCode API's rate_n_flags format,
523 * fill "search" or "active" tx mode table.
524 */
525 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
526 enum ieee80211_band band,
527 struct iwl_scale_tbl_info *tbl,
528 int *rate_idx)
529 {
530 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
531 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
532 u8 mcs;
533
534 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
535
536 if (*rate_idx == IWL_RATE_INVALID) {
537 *rate_idx = -1;
538 return -EINVAL;
539 }
540 tbl->is_SGI = 0; /* default legacy setup */
541 tbl->is_fat = 0;
542 tbl->is_dup = 0;
543 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
544 tbl->lq_type = LQ_NONE;
545
546 /* legacy rate format */
547 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
548 if (num_of_ant == 1) {
549 if (band == IEEE80211_BAND_5GHZ)
550 tbl->lq_type = LQ_A;
551 else
552 tbl->lq_type = LQ_G;
553 }
554 /* HT rate format */
555 } else {
556 if (rate_n_flags & RATE_MCS_SGI_MSK)
557 tbl->is_SGI = 1;
558
559 if ((rate_n_flags & RATE_MCS_FAT_MSK) ||
560 (rate_n_flags & RATE_MCS_DUP_MSK))
561 tbl->is_fat = 1;
562
563 if (rate_n_flags & RATE_MCS_DUP_MSK)
564 tbl->is_dup = 1;
565
566 mcs = rs_extract_rate(rate_n_flags);
567
568 /* SISO */
569 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
570 if (num_of_ant == 1)
571 tbl->lq_type = LQ_SISO; /*else NONE*/
572 /* MIMO2 */
573 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
574 if (num_of_ant == 2)
575 tbl->lq_type = LQ_MIMO2;
576 /* MIMO3 */
577 } else {
578 if (num_of_ant == 3)
579 tbl->lq_type = LQ_MIMO3;
580 }
581 }
582 return 0;
583 }
584
585 /* switch to another antenna/antennas and return 1 */
586 /* if no other valid antenna found, return 0 */
587 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
588 struct iwl_scale_tbl_info *tbl)
589 {
590 u8 new_ant_type;
591
592 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
593 return 0;
594
595 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
596 return 0;
597
598 new_ant_type = ant_toggle_lookup[tbl->ant_type];
599
600 while ((new_ant_type != tbl->ant_type) &&
601 !rs_is_valid_ant(valid_ant, new_ant_type))
602 new_ant_type = ant_toggle_lookup[new_ant_type];
603
604 if (new_ant_type == tbl->ant_type)
605 return 0;
606
607 tbl->ant_type = new_ant_type;
608 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
609 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
610 return 1;
611 }
612
613 /* FIXME:RS: in 4965 we don't use greenfield at all */
614 /* FIXME:RS: don't use greenfield for now in TX */
615 #if 0
616 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
617 {
618 return (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) &&
619 priv->current_ht_config.is_green_field &&
620 !priv->current_ht_config.non_GF_STA_present;
621 }
622 #endif
623 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
624 {
625 return 0;
626 }
627
628 /**
629 * rs_get_supported_rates - get the available rates
630 *
631 * if management frame or broadcast frame only return
632 * basic available rates.
633 *
634 */
635 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
636 struct ieee80211_hdr *hdr,
637 enum iwl_table_type rate_type)
638 {
639 if (hdr && is_multicast_ether_addr(hdr->addr1) &&
640 lq_sta->active_rate_basic)
641 return lq_sta->active_rate_basic;
642
643 if (is_legacy(rate_type)) {
644 return lq_sta->active_legacy_rate;
645 } else {
646 if (is_siso(rate_type))
647 return lq_sta->active_siso_rate;
648 else if (is_mimo2(rate_type))
649 return lq_sta->active_mimo2_rate;
650 else
651 return lq_sta->active_mimo3_rate;
652 }
653 }
654
655 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
656 int rate_type)
657 {
658 u8 high = IWL_RATE_INVALID;
659 u8 low = IWL_RATE_INVALID;
660
661 /* 802.11A or ht walks to the next literal adjacent rate in
662 * the rate table */
663 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
664 int i;
665 u32 mask;
666
667 /* Find the previous rate that is in the rate mask */
668 i = index - 1;
669 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
670 if (rate_mask & mask) {
671 low = i;
672 break;
673 }
674 }
675
676 /* Find the next rate that is in the rate mask */
677 i = index + 1;
678 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
679 if (rate_mask & mask) {
680 high = i;
681 break;
682 }
683 }
684
685 return (high << 8) | low;
686 }
687
688 low = index;
689 while (low != IWL_RATE_INVALID) {
690 low = iwl_rates[low].prev_rs;
691 if (low == IWL_RATE_INVALID)
692 break;
693 if (rate_mask & (1 << low))
694 break;
695 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
696 }
697
698 high = index;
699 while (high != IWL_RATE_INVALID) {
700 high = iwl_rates[high].next_rs;
701 if (high == IWL_RATE_INVALID)
702 break;
703 if (rate_mask & (1 << high))
704 break;
705 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
706 }
707
708 return (high << 8) | low;
709 }
710
711 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
712 struct iwl_scale_tbl_info *tbl,
713 u8 scale_index, u8 ht_possible)
714 {
715 s32 low;
716 u16 rate_mask;
717 u16 high_low;
718 u8 switch_to_legacy = 0;
719 u8 is_green = lq_sta->is_green;
720
721 /* check if we need to switch from HT to legacy rates.
722 * assumption is that mandatory rates (1Mbps or 6Mbps)
723 * are always supported (spec demand) */
724 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
725 switch_to_legacy = 1;
726 scale_index = rs_ht_to_legacy[scale_index];
727 if (lq_sta->band == IEEE80211_BAND_5GHZ)
728 tbl->lq_type = LQ_A;
729 else
730 tbl->lq_type = LQ_G;
731
732 if (num_of_ant(tbl->ant_type) > 1)
733 tbl->ant_type = ANT_A;/*FIXME:RS*/
734
735 tbl->is_fat = 0;
736 tbl->is_SGI = 0;
737 }
738
739 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
740
741 /* Mask with station rate restriction */
742 if (is_legacy(tbl->lq_type)) {
743 /* supp_rates has no CCK bits in A mode */
744 if (lq_sta->band == IEEE80211_BAND_5GHZ)
745 rate_mask = (u16)(rate_mask &
746 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
747 else
748 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
749 }
750
751 /* If we switched from HT to legacy, check current rate */
752 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
753 low = scale_index;
754 goto out;
755 }
756
757 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
758 tbl->lq_type);
759 low = high_low & 0xff;
760
761 if (low == IWL_RATE_INVALID)
762 low = scale_index;
763
764 out:
765 return rate_n_flags_from_tbl(tbl, low, is_green);
766 }
767
768 /*
769 * mac80211 sends us Tx status
770 */
771 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
772 struct ieee80211_sta *sta, void *priv_sta,
773 struct sk_buff *skb)
774 {
775 int status;
776 u8 retries;
777 int rs_index, index = 0;
778 struct iwl_lq_sta *lq_sta;
779 struct iwl_link_quality_cmd *table;
780 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
781 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
782 struct ieee80211_hw *hw = priv->hw;
783 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
784 struct iwl_rate_scale_data *window = NULL;
785 struct iwl_rate_scale_data *search_win = NULL;
786 u32 tx_rate;
787 struct iwl_scale_tbl_info tbl_type;
788 struct iwl_scale_tbl_info *curr_tbl, *search_tbl;
789 u8 active_index = 0;
790 __le16 fc = hdr->frame_control;
791 s32 tpt = 0;
792
793 IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
794
795 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1))
796 return;
797
798 /* This packet was aggregated but doesn't carry rate scale info */
799 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
800 !(info->flags & IEEE80211_TX_STAT_AMPDU))
801 return;
802
803 retries = info->status.retry_count;
804
805 if (retries > 15)
806 retries = 15;
807
808 lq_sta = (struct iwl_lq_sta *)priv_sta;
809
810 if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
811 !lq_sta->ibss_sta_added)
812 goto out;
813
814 table = &lq_sta->lq;
815 active_index = lq_sta->active_tbl;
816
817 curr_tbl = &(lq_sta->lq_info[active_index]);
818 search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
819 window = (struct iwl_rate_scale_data *)&(curr_tbl->win[0]);
820 search_win = (struct iwl_rate_scale_data *)&(search_tbl->win[0]);
821
822 /*
823 * Ignore this Tx frame response if its initial rate doesn't match
824 * that of latest Link Quality command. There may be stragglers
825 * from a previous Link Quality command, but we're no longer interested
826 * in those; they're either from the "active" mode while we're trying
827 * to check "search" mode, or a prior "search" mode after we've moved
828 * to a new "search" mode (which might become the new "active" mode).
829 */
830 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
831 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
832 if (priv->band == IEEE80211_BAND_5GHZ)
833 rs_index -= IWL_FIRST_OFDM_RATE;
834
835 if ((info->tx_rate_idx < 0) ||
836 (tbl_type.is_SGI ^
837 !!(info->flags & IEEE80211_TX_CTL_SHORT_GI)) ||
838 (tbl_type.is_fat ^
839 !!(info->flags & IEEE80211_TX_CTL_40_MHZ_WIDTH)) ||
840 (tbl_type.is_dup ^
841 !!(info->flags & IEEE80211_TX_CTL_DUP_DATA)) ||
842 (tbl_type.ant_type ^ info->antenna_sel_tx) ||
843 (!!(tx_rate & RATE_MCS_HT_MSK) ^
844 !!(info->flags & IEEE80211_TX_CTL_OFDM_HT)) ||
845 (!!(tx_rate & RATE_MCS_GF_MSK) ^
846 !!(info->flags & IEEE80211_TX_CTL_GREEN_FIELD)) ||
847 (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
848 hw->wiphy->bands[info->band]->bitrates[info->tx_rate_idx].bitrate)) {
849 IWL_DEBUG_RATE("initial rate does not match 0x%x\n", tx_rate);
850 goto out;
851 }
852
853 /* Update frame history window with "failure" for each Tx retry. */
854 while (retries) {
855 /* Look up the rate and other info used for each tx attempt.
856 * Each tx attempt steps one entry deeper in the rate table. */
857 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
858 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
859 &tbl_type, &rs_index);
860
861 /* If type matches "search" table,
862 * add failure to "search" history */
863 if ((tbl_type.lq_type == search_tbl->lq_type) &&
864 (tbl_type.ant_type == search_tbl->ant_type) &&
865 (tbl_type.is_SGI == search_tbl->is_SGI)) {
866 if (search_tbl->expected_tpt)
867 tpt = search_tbl->expected_tpt[rs_index];
868 else
869 tpt = 0;
870 rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
871
872 /* Else if type matches "current/active" table,
873 * add failure to "current/active" history */
874 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
875 (tbl_type.ant_type == curr_tbl->ant_type) &&
876 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
877 if (curr_tbl->expected_tpt)
878 tpt = curr_tbl->expected_tpt[rs_index];
879 else
880 tpt = 0;
881 rs_collect_tx_data(window, rs_index, tpt, 1, 0);
882 }
883
884 /* If not searching for a new mode, increment failed counter
885 * ... this helps determine when to start searching again */
886 if (lq_sta->stay_in_tbl)
887 lq_sta->total_failed++;
888 --retries;
889 index++;
890
891 }
892
893 /*
894 * Find (by rate) the history window to update with final Tx attempt;
895 * if Tx was successful first try, use original rate,
896 * else look up the rate that was, finally, successful.
897 */
898 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
899 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
900
901 /* Update frame history window with "success" if Tx got ACKed ... */
902 status = !!(info->flags & IEEE80211_TX_STAT_ACK);
903
904 /* If type matches "search" table,
905 * add final tx status to "search" history */
906 if ((tbl_type.lq_type == search_tbl->lq_type) &&
907 (tbl_type.ant_type == search_tbl->ant_type) &&
908 (tbl_type.is_SGI == search_tbl->is_SGI)) {
909 if (search_tbl->expected_tpt)
910 tpt = search_tbl->expected_tpt[rs_index];
911 else
912 tpt = 0;
913 if (info->flags & IEEE80211_TX_CTL_AMPDU)
914 rs_collect_tx_data(search_win, rs_index, tpt,
915 info->status.ampdu_ack_len,
916 info->status.ampdu_ack_map);
917 else
918 rs_collect_tx_data(search_win, rs_index, tpt,
919 1, status);
920 /* Else if type matches "current/active" table,
921 * add final tx status to "current/active" history */
922 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
923 (tbl_type.ant_type == curr_tbl->ant_type) &&
924 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
925 if (curr_tbl->expected_tpt)
926 tpt = curr_tbl->expected_tpt[rs_index];
927 else
928 tpt = 0;
929 if (info->flags & IEEE80211_TX_CTL_AMPDU)
930 rs_collect_tx_data(window, rs_index, tpt,
931 info->status.ampdu_ack_len,
932 info->status.ampdu_ack_map);
933 else
934 rs_collect_tx_data(window, rs_index, tpt,
935 1, status);
936 }
937
938 /* If not searching for new mode, increment success/failed counter
939 * ... these help determine when to start searching again */
940 if (lq_sta->stay_in_tbl) {
941 if (info->flags & IEEE80211_TX_CTL_AMPDU) {
942 lq_sta->total_success += info->status.ampdu_ack_map;
943 lq_sta->total_failed +=
944 (info->status.ampdu_ack_len - info->status.ampdu_ack_map);
945 } else {
946 if (status)
947 lq_sta->total_success++;
948 else
949 lq_sta->total_failed++;
950 }
951 }
952
953 /* See if there's a better rate or modulation mode to try. */
954 rs_rate_scale_perform(priv, hdr, sta, lq_sta);
955 out:
956 return;
957 }
958
959 /*
960 * Begin a period of staying with a selected modulation mode.
961 * Set "stay_in_tbl" flag to prevent any mode switches.
962 * Set frame tx success limits according to legacy vs. high-throughput,
963 * and reset overall (spanning all rates) tx success history statistics.
964 * These control how long we stay using same modulation mode before
965 * searching for a new mode.
966 */
967 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
968 struct iwl_lq_sta *lq_sta)
969 {
970 IWL_DEBUG_RATE("we are staying in the same table\n");
971 lq_sta->stay_in_tbl = 1; /* only place this gets set */
972 if (is_legacy) {
973 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
974 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
975 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
976 } else {
977 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
978 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
979 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
980 }
981 lq_sta->table_count = 0;
982 lq_sta->total_failed = 0;
983 lq_sta->total_success = 0;
984 }
985
986 /*
987 * Find correct throughput table for given mode of modulation
988 */
989 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
990 struct iwl_scale_tbl_info *tbl)
991 {
992 if (is_legacy(tbl->lq_type)) {
993 if (!is_a_band(tbl->lq_type))
994 tbl->expected_tpt = expected_tpt_G;
995 else
996 tbl->expected_tpt = expected_tpt_A;
997 } else if (is_siso(tbl->lq_type)) {
998 if (tbl->is_fat && !lq_sta->is_dup)
999 if (tbl->is_SGI)
1000 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
1001 else
1002 tbl->expected_tpt = expected_tpt_siso40MHz;
1003 else if (tbl->is_SGI)
1004 tbl->expected_tpt = expected_tpt_siso20MHzSGI;
1005 else
1006 tbl->expected_tpt = expected_tpt_siso20MHz;
1007
1008 } else if (is_mimo(tbl->lq_type)) { /* FIXME:need to separate mimo2/3 */
1009 if (tbl->is_fat && !lq_sta->is_dup)
1010 if (tbl->is_SGI)
1011 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
1012 else
1013 tbl->expected_tpt = expected_tpt_mimo40MHz;
1014 else if (tbl->is_SGI)
1015 tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
1016 else
1017 tbl->expected_tpt = expected_tpt_mimo20MHz;
1018 } else
1019 tbl->expected_tpt = expected_tpt_G;
1020 }
1021
1022 /*
1023 * Find starting rate for new "search" high-throughput mode of modulation.
1024 * Goal is to find lowest expected rate (under perfect conditions) that is
1025 * above the current measured throughput of "active" mode, to give new mode
1026 * a fair chance to prove itself without too many challenges.
1027 *
1028 * This gets called when transitioning to more aggressive modulation
1029 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1030 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1031 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1032 * bit rate will typically need to increase, but not if performance was bad.
1033 */
1034 static s32 rs_get_best_rate(struct iwl_priv *priv,
1035 struct iwl_lq_sta *lq_sta,
1036 struct iwl_scale_tbl_info *tbl, /* "search" */
1037 u16 rate_mask, s8 index)
1038 {
1039 /* "active" values */
1040 struct iwl_scale_tbl_info *active_tbl =
1041 &(lq_sta->lq_info[lq_sta->active_tbl]);
1042 s32 active_sr = active_tbl->win[index].success_ratio;
1043 s32 active_tpt = active_tbl->expected_tpt[index];
1044
1045 /* expected "search" throughput */
1046 s32 *tpt_tbl = tbl->expected_tpt;
1047
1048 s32 new_rate, high, low, start_hi;
1049 u16 high_low;
1050 s8 rate = index;
1051
1052 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1053
1054 for (; ;) {
1055 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1056 tbl->lq_type);
1057
1058 low = high_low & 0xff;
1059 high = (high_low >> 8) & 0xff;
1060
1061 /*
1062 * Lower the "search" bit rate, to give new "search" mode
1063 * approximately the same throughput as "active" if:
1064 *
1065 * 1) "Active" mode has been working modestly well (but not
1066 * great), and expected "search" throughput (under perfect
1067 * conditions) at candidate rate is above the actual
1068 * measured "active" throughput (but less than expected
1069 * "active" throughput under perfect conditions).
1070 * OR
1071 * 2) "Active" mode has been working perfectly or very well
1072 * and expected "search" throughput (under perfect
1073 * conditions) at candidate rate is above expected
1074 * "active" throughput (under perfect conditions).
1075 */
1076 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1077 ((active_sr > IWL_RATE_DECREASE_TH) &&
1078 (active_sr <= IWL_RATE_HIGH_TH) &&
1079 (tpt_tbl[rate] <= active_tpt))) ||
1080 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1081 (tpt_tbl[rate] > active_tpt))) {
1082
1083 /* (2nd or later pass)
1084 * If we've already tried to raise the rate, and are
1085 * now trying to lower it, use the higher rate. */
1086 if (start_hi != IWL_RATE_INVALID) {
1087 new_rate = start_hi;
1088 break;
1089 }
1090
1091 new_rate = rate;
1092
1093 /* Loop again with lower rate */
1094 if (low != IWL_RATE_INVALID)
1095 rate = low;
1096
1097 /* Lower rate not available, use the original */
1098 else
1099 break;
1100
1101 /* Else try to raise the "search" rate to match "active" */
1102 } else {
1103 /* (2nd or later pass)
1104 * If we've already tried to lower the rate, and are
1105 * now trying to raise it, use the lower rate. */
1106 if (new_rate != IWL_RATE_INVALID)
1107 break;
1108
1109 /* Loop again with higher rate */
1110 else if (high != IWL_RATE_INVALID) {
1111 start_hi = high;
1112 rate = high;
1113
1114 /* Higher rate not available, use the original */
1115 } else {
1116 new_rate = rate;
1117 break;
1118 }
1119 }
1120 }
1121
1122 return new_rate;
1123 }
1124
1125 /*
1126 * Set up search table for MIMO
1127 */
1128 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1129 struct iwl_lq_sta *lq_sta,
1130 struct ieee80211_conf *conf,
1131 struct ieee80211_sta *sta,
1132 struct iwl_scale_tbl_info *tbl, int index)
1133 {
1134 u16 rate_mask;
1135 s32 rate;
1136 s8 is_green = lq_sta->is_green;
1137
1138 if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1139 !sta->ht_info.ht_supported)
1140 return -1;
1141
1142 if (((sta->ht_info.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1143 == WLAN_HT_CAP_SM_PS_STATIC)
1144 return -1;
1145
1146 /* Need both Tx chains/antennas to support MIMO */
1147 if (priv->hw_params.tx_chains_num < 2)
1148 return -1;
1149
1150 IWL_DEBUG_RATE("LQ: try to switch to MIMO2\n");
1151
1152 tbl->lq_type = LQ_MIMO2;
1153 tbl->is_dup = lq_sta->is_dup;
1154 tbl->action = 0;
1155 rate_mask = lq_sta->active_mimo2_rate;
1156
1157 if (priv->current_ht_config.supported_chan_width
1158 == IWL_CHANNEL_WIDTH_40MHZ)
1159 tbl->is_fat = 1;
1160 else
1161 tbl->is_fat = 0;
1162
1163 /* FIXME: - don't toggle SGI here
1164 if (tbl->is_fat) {
1165 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1166 tbl->is_SGI = 1;
1167 else
1168 tbl->is_SGI = 0;
1169 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1170 tbl->is_SGI = 1;
1171 else
1172 tbl->is_SGI = 0;
1173 */
1174
1175 rs_set_expected_tpt_table(lq_sta, tbl);
1176
1177 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1178
1179 IWL_DEBUG_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1180
1181 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1182 IWL_DEBUG_RATE("Can't switch with index %d rate mask %x\n",
1183 rate, rate_mask);
1184 return -1;
1185 }
1186 tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1187
1188 IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1189 tbl->current_rate, is_green);
1190 return 0;
1191 }
1192
1193 /*
1194 * Set up search table for SISO
1195 */
1196 static int rs_switch_to_siso(struct iwl_priv *priv,
1197 struct iwl_lq_sta *lq_sta,
1198 struct ieee80211_conf *conf,
1199 struct ieee80211_sta *sta,
1200 struct iwl_scale_tbl_info *tbl, int index)
1201 {
1202 u16 rate_mask;
1203 u8 is_green = lq_sta->is_green;
1204 s32 rate;
1205
1206 if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1207 !sta->ht_info.ht_supported)
1208 return -1;
1209
1210 IWL_DEBUG_RATE("LQ: try to switch to SISO\n");
1211
1212 tbl->is_dup = lq_sta->is_dup;
1213 tbl->lq_type = LQ_SISO;
1214 tbl->action = 0;
1215 rate_mask = lq_sta->active_siso_rate;
1216
1217 if (priv->current_ht_config.supported_chan_width
1218 == IWL_CHANNEL_WIDTH_40MHZ)
1219 tbl->is_fat = 1;
1220 else
1221 tbl->is_fat = 0;
1222
1223 /* FIXME: - don't toggle SGI here
1224 if (tbl->is_fat) {
1225 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1226 tbl->is_SGI = 1;
1227 else
1228 tbl->is_SGI = 0;
1229 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1230 tbl->is_SGI = 1;
1231 else
1232 tbl->is_SGI = 0;
1233 */
1234
1235 if (is_green)
1236 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1237
1238 rs_set_expected_tpt_table(lq_sta, tbl);
1239 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1240
1241 IWL_DEBUG_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask);
1242 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1243 IWL_DEBUG_RATE("can not switch with index %d rate mask %x\n",
1244 rate, rate_mask);
1245 return -1;
1246 }
1247 tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1248 IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1249 tbl->current_rate, is_green);
1250 return 0;
1251 }
1252
1253 /*
1254 * Try to switch to new modulation mode from legacy
1255 */
1256 static int rs_move_legacy_other(struct iwl_priv *priv,
1257 struct iwl_lq_sta *lq_sta,
1258 struct ieee80211_conf *conf,
1259 struct ieee80211_sta *sta,
1260 int index)
1261 {
1262 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1263 struct iwl_scale_tbl_info *search_tbl =
1264 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1265 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1266 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1267 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1268 u8 start_action = tbl->action;
1269 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1270 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1271 int ret = 0;
1272
1273 for (; ;) {
1274 switch (tbl->action) {
1275 case IWL_LEGACY_SWITCH_ANTENNA1:
1276 case IWL_LEGACY_SWITCH_ANTENNA2:
1277 IWL_DEBUG_RATE("LQ: Legacy toggle Antenna\n");
1278
1279 lq_sta->action_counter++;
1280
1281 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1282 tx_chains_num <= 1) ||
1283 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1284 tx_chains_num <= 2))
1285 break;
1286
1287 /* Don't change antenna if success has been great */
1288 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1289 break;
1290
1291 /* Set up search table to try other antenna */
1292 memcpy(search_tbl, tbl, sz);
1293
1294 if (rs_toggle_antenna(valid_tx_ant,
1295 &search_tbl->current_rate, search_tbl)) {
1296 rs_set_expected_tpt_table(lq_sta, search_tbl);
1297 goto out;
1298 }
1299 break;
1300 case IWL_LEGACY_SWITCH_SISO:
1301 IWL_DEBUG_RATE("LQ: Legacy switch to SISO\n");
1302
1303 /* Set up search table to try SISO */
1304 memcpy(search_tbl, tbl, sz);
1305 search_tbl->is_SGI = 0;
1306 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1307 search_tbl, index);
1308 if (!ret) {
1309 lq_sta->action_counter = 0;
1310 goto out;
1311 }
1312
1313 break;
1314 case IWL_LEGACY_SWITCH_MIMO2_AB:
1315 case IWL_LEGACY_SWITCH_MIMO2_AC:
1316 case IWL_LEGACY_SWITCH_MIMO2_BC:
1317 IWL_DEBUG_RATE("LQ: Legacy switch to MIMO2\n");
1318
1319 /* Set up search table to try MIMO */
1320 memcpy(search_tbl, tbl, sz);
1321 search_tbl->is_SGI = 0;
1322
1323 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1324 search_tbl->ant_type = ANT_AB;
1325 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1326 search_tbl->ant_type = ANT_AC;
1327 else
1328 search_tbl->ant_type = ANT_BC;
1329
1330 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1331 break;
1332
1333 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1334 search_tbl, index);
1335 if (!ret) {
1336 lq_sta->action_counter = 0;
1337 goto out;
1338 }
1339 break;
1340 }
1341 tbl->action++;
1342 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2_BC)
1343 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1344
1345 if (tbl->action == start_action)
1346 break;
1347
1348 }
1349 search_tbl->lq_type = LQ_NONE;
1350 return 0;
1351
1352 out:
1353 lq_sta->search_better_tbl = 1;
1354 tbl->action++;
1355 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2_BC)
1356 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1357 return 0;
1358
1359 }
1360
1361 /*
1362 * Try to switch to new modulation mode from SISO
1363 */
1364 static int rs_move_siso_to_other(struct iwl_priv *priv,
1365 struct iwl_lq_sta *lq_sta,
1366 struct ieee80211_conf *conf,
1367 struct ieee80211_sta *sta, int index)
1368 {
1369 u8 is_green = lq_sta->is_green;
1370 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1371 struct iwl_scale_tbl_info *search_tbl =
1372 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1373 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1374 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1375 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1376 u8 start_action = tbl->action;
1377 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1378 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1379 int ret;
1380
1381 for (;;) {
1382 lq_sta->action_counter++;
1383 switch (tbl->action) {
1384 case IWL_SISO_SWITCH_ANTENNA1:
1385 case IWL_SISO_SWITCH_ANTENNA2:
1386 IWL_DEBUG_RATE("LQ: SISO toggle Antenna\n");
1387
1388 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1389 tx_chains_num <= 1) ||
1390 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1391 tx_chains_num <= 2))
1392 break;
1393
1394 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1395 break;
1396
1397 memcpy(search_tbl, tbl, sz);
1398 if (rs_toggle_antenna(valid_tx_ant,
1399 &search_tbl->current_rate, search_tbl))
1400 goto out;
1401 break;
1402 case IWL_SISO_SWITCH_MIMO2_AB:
1403 case IWL_SISO_SWITCH_MIMO2_AC:
1404 case IWL_SISO_SWITCH_MIMO2_BC:
1405 IWL_DEBUG_RATE("LQ: SISO switch to MIMO2\n");
1406 memcpy(search_tbl, tbl, sz);
1407 search_tbl->is_SGI = 0;
1408
1409 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1410 search_tbl->ant_type = ANT_AB;
1411 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1412 search_tbl->ant_type = ANT_AC;
1413 else
1414 search_tbl->ant_type = ANT_BC;
1415
1416 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1417 break;
1418
1419 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1420 search_tbl, index);
1421 if (!ret)
1422 goto out;
1423 break;
1424 case IWL_SISO_SWITCH_GI:
1425 if (!tbl->is_fat &&
1426 !(priv->current_ht_config.sgf &
1427 HT_SHORT_GI_20MHZ))
1428 break;
1429 if (tbl->is_fat &&
1430 !(priv->current_ht_config.sgf &
1431 HT_SHORT_GI_40MHZ))
1432 break;
1433
1434 IWL_DEBUG_RATE("LQ: SISO toggle SGI/NGI\n");
1435
1436 memcpy(search_tbl, tbl, sz);
1437 if (is_green) {
1438 if (!tbl->is_SGI)
1439 break;
1440 else
1441 IWL_ERROR("SGI was set in GF+SISO\n");
1442 }
1443 search_tbl->is_SGI = !tbl->is_SGI;
1444 rs_set_expected_tpt_table(lq_sta, search_tbl);
1445 if (tbl->is_SGI) {
1446 s32 tpt = lq_sta->last_tpt / 100;
1447 if (tpt >= search_tbl->expected_tpt[index])
1448 break;
1449 }
1450 search_tbl->current_rate = rate_n_flags_from_tbl(
1451 search_tbl, index, is_green);
1452 goto out;
1453 }
1454 tbl->action++;
1455 if (tbl->action > IWL_SISO_SWITCH_GI)
1456 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1457
1458 if (tbl->action == start_action)
1459 break;
1460 }
1461 search_tbl->lq_type = LQ_NONE;
1462 return 0;
1463
1464 out:
1465 lq_sta->search_better_tbl = 1;
1466 tbl->action++;
1467 if (tbl->action > IWL_SISO_SWITCH_GI)
1468 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1469 return 0;
1470 }
1471
1472 /*
1473 * Try to switch to new modulation mode from MIMO
1474 */
1475 static int rs_move_mimo_to_other(struct iwl_priv *priv,
1476 struct iwl_lq_sta *lq_sta,
1477 struct ieee80211_conf *conf,
1478 struct ieee80211_sta *sta, int index)
1479 {
1480 s8 is_green = lq_sta->is_green;
1481 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1482 struct iwl_scale_tbl_info *search_tbl =
1483 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1484 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1485 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1486 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1487 u8 start_action = tbl->action;
1488 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1489 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1490 int ret;
1491
1492 for (;;) {
1493 lq_sta->action_counter++;
1494 switch (tbl->action) {
1495 case IWL_MIMO2_SWITCH_ANTENNA1:
1496 case IWL_MIMO2_SWITCH_ANTENNA2:
1497 IWL_DEBUG_RATE("LQ: MIMO toggle Antennas\n");
1498
1499 if (tx_chains_num <= 2)
1500 break;
1501
1502 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1503 break;
1504
1505 memcpy(search_tbl, tbl, sz);
1506 if (rs_toggle_antenna(valid_tx_ant,
1507 &search_tbl->current_rate, search_tbl))
1508 goto out;
1509 break;
1510 case IWL_MIMO2_SWITCH_SISO_A:
1511 case IWL_MIMO2_SWITCH_SISO_B:
1512 case IWL_MIMO2_SWITCH_SISO_C:
1513 IWL_DEBUG_RATE("LQ: MIMO2 switch to SISO\n");
1514
1515 /* Set up new search table for SISO */
1516 memcpy(search_tbl, tbl, sz);
1517
1518 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1519 search_tbl->ant_type = ANT_A;
1520 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1521 search_tbl->ant_type = ANT_B;
1522 else
1523 search_tbl->ant_type = ANT_C;
1524
1525 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1526 break;
1527
1528 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1529 search_tbl, index);
1530 if (!ret)
1531 goto out;
1532
1533 break;
1534
1535 case IWL_MIMO2_SWITCH_GI:
1536 if (!tbl->is_fat &&
1537 !(priv->current_ht_config.sgf &
1538 HT_SHORT_GI_20MHZ))
1539 break;
1540 if (tbl->is_fat &&
1541 !(priv->current_ht_config.sgf &
1542 HT_SHORT_GI_40MHZ))
1543 break;
1544
1545 IWL_DEBUG_RATE("LQ: MIMO toggle SGI/NGI\n");
1546
1547 /* Set up new search table for MIMO */
1548 memcpy(search_tbl, tbl, sz);
1549 search_tbl->is_SGI = !tbl->is_SGI;
1550 rs_set_expected_tpt_table(lq_sta, search_tbl);
1551 /*
1552 * If active table already uses the fastest possible
1553 * modulation (dual stream with short guard interval),
1554 * and it's working well, there's no need to look
1555 * for a better type of modulation!
1556 */
1557 if (tbl->is_SGI) {
1558 s32 tpt = lq_sta->last_tpt / 100;
1559 if (tpt >= search_tbl->expected_tpt[index])
1560 break;
1561 }
1562 search_tbl->current_rate = rate_n_flags_from_tbl(
1563 search_tbl, index, is_green);
1564 goto out;
1565
1566 }
1567 tbl->action++;
1568 if (tbl->action > IWL_MIMO2_SWITCH_GI)
1569 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1570
1571 if (tbl->action == start_action)
1572 break;
1573 }
1574 search_tbl->lq_type = LQ_NONE;
1575 return 0;
1576 out:
1577 lq_sta->search_better_tbl = 1;
1578 tbl->action++;
1579 if (tbl->action > IWL_MIMO2_SWITCH_GI)
1580 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1581 return 0;
1582
1583 }
1584
1585 /*
1586 * Check whether we should continue using same modulation mode, or
1587 * begin search for a new mode, based on:
1588 * 1) # tx successes or failures while using this mode
1589 * 2) # times calling this function
1590 * 3) elapsed time in this mode (not used, for now)
1591 */
1592 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta)
1593 {
1594 struct iwl_scale_tbl_info *tbl;
1595 int i;
1596 int active_tbl;
1597 int flush_interval_passed = 0;
1598 struct iwl_priv *priv;
1599
1600 priv = lq_sta->drv;
1601 active_tbl = lq_sta->active_tbl;
1602
1603 tbl = &(lq_sta->lq_info[active_tbl]);
1604
1605 /* If we've been disallowing search, see if we should now allow it */
1606 if (lq_sta->stay_in_tbl) {
1607
1608 /* Elapsed time using current modulation mode */
1609 if (lq_sta->flush_timer)
1610 flush_interval_passed =
1611 time_after(jiffies,
1612 (unsigned long)(lq_sta->flush_timer +
1613 IWL_RATE_SCALE_FLUSH_INTVL));
1614
1615 /*
1616 * Check if we should allow search for new modulation mode.
1617 * If many frames have failed or succeeded, or we've used
1618 * this same modulation for a long time, allow search, and
1619 * reset history stats that keep track of whether we should
1620 * allow a new search. Also (below) reset all bitmaps and
1621 * stats in active history.
1622 */
1623 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1624 (lq_sta->total_success > lq_sta->max_success_limit) ||
1625 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1626 && (flush_interval_passed))) {
1627 IWL_DEBUG_RATE("LQ: stay is expired %d %d %d\n:",
1628 lq_sta->total_failed,
1629 lq_sta->total_success,
1630 flush_interval_passed);
1631
1632 /* Allow search for new mode */
1633 lq_sta->stay_in_tbl = 0; /* only place reset */
1634 lq_sta->total_failed = 0;
1635 lq_sta->total_success = 0;
1636 lq_sta->flush_timer = 0;
1637
1638 /*
1639 * Else if we've used this modulation mode enough repetitions
1640 * (regardless of elapsed time or success/failure), reset
1641 * history bitmaps and rate-specific stats for all rates in
1642 * active table.
1643 */
1644 } else {
1645 lq_sta->table_count++;
1646 if (lq_sta->table_count >=
1647 lq_sta->table_count_limit) {
1648 lq_sta->table_count = 0;
1649
1650 IWL_DEBUG_RATE("LQ: stay in table clear win\n");
1651 for (i = 0; i < IWL_RATE_COUNT; i++)
1652 rs_rate_scale_clear_window(
1653 &(tbl->win[i]));
1654 }
1655 }
1656
1657 /* If transitioning to allow "search", reset all history
1658 * bitmaps and stats in active table (this will become the new
1659 * "search" table). */
1660 if (!lq_sta->stay_in_tbl) {
1661 for (i = 0; i < IWL_RATE_COUNT; i++)
1662 rs_rate_scale_clear_window(&(tbl->win[i]));
1663 }
1664 }
1665 }
1666
1667 /*
1668 * Do rate scaling and search for new modulation mode.
1669 */
1670 static void rs_rate_scale_perform(struct iwl_priv *priv,
1671 struct ieee80211_hdr *hdr,
1672 struct ieee80211_sta *sta,
1673 struct iwl_lq_sta *lq_sta)
1674 {
1675 struct ieee80211_hw *hw = priv->hw;
1676 struct ieee80211_conf *conf = &hw->conf;
1677 int low = IWL_RATE_INVALID;
1678 int high = IWL_RATE_INVALID;
1679 int index;
1680 int i;
1681 struct iwl_rate_scale_data *window = NULL;
1682 int current_tpt = IWL_INVALID_VALUE;
1683 int low_tpt = IWL_INVALID_VALUE;
1684 int high_tpt = IWL_INVALID_VALUE;
1685 u32 fail_count;
1686 s8 scale_action = 0;
1687 __le16 fc;
1688 u16 rate_mask;
1689 u8 update_lq = 0;
1690 struct iwl_scale_tbl_info *tbl, *tbl1;
1691 u16 rate_scale_index_msk = 0;
1692 u32 rate;
1693 u8 is_green = 0;
1694 u8 active_tbl = 0;
1695 u8 done_search = 0;
1696 u16 high_low;
1697 s32 sr;
1698 u8 tid = MAX_TID_COUNT;
1699
1700 IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1701
1702 fc = hdr->frame_control;
1703 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
1704 /* Send management frames and broadcast/multicast data using
1705 * lowest rate. */
1706 /* TODO: this could probably be improved.. */
1707 return;
1708 }
1709
1710 if (!sta || !lq_sta)
1711 return;
1712
1713 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
1714
1715 tid = rs_tl_add_packet(lq_sta, hdr);
1716
1717 /*
1718 * Select rate-scale / modulation-mode table to work with in
1719 * the rest of this function: "search" if searching for better
1720 * modulation mode, or "active" if doing rate scaling within a mode.
1721 */
1722 if (!lq_sta->search_better_tbl)
1723 active_tbl = lq_sta->active_tbl;
1724 else
1725 active_tbl = 1 - lq_sta->active_tbl;
1726
1727 tbl = &(lq_sta->lq_info[active_tbl]);
1728 is_green = lq_sta->is_green;
1729
1730 /* current tx rate */
1731 index = lq_sta->last_txrate_idx;
1732
1733 IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1734 tbl->lq_type);
1735
1736 /* rates available for this association, and for modulation mode */
1737 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
1738
1739 IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1740
1741 /* mask with station rate restriction */
1742 if (is_legacy(tbl->lq_type)) {
1743 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1744 /* supp_rates has no CCK bits in A mode */
1745 rate_scale_index_msk = (u16) (rate_mask &
1746 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1747 else
1748 rate_scale_index_msk = (u16) (rate_mask &
1749 lq_sta->supp_rates);
1750
1751 } else
1752 rate_scale_index_msk = rate_mask;
1753
1754 if (!rate_scale_index_msk)
1755 rate_scale_index_msk = rate_mask;
1756
1757 if (!((1 << index) & rate_scale_index_msk)) {
1758 IWL_ERROR("Current Rate is not valid\n");
1759 return;
1760 }
1761
1762 /* Get expected throughput table and history window for current rate */
1763 if (!tbl->expected_tpt) {
1764 IWL_ERROR("tbl->expected_tpt is NULL\n");
1765 return;
1766 }
1767
1768 window = &(tbl->win[index]);
1769
1770 /*
1771 * If there is not enough history to calculate actual average
1772 * throughput, keep analyzing results of more tx frames, without
1773 * changing rate or mode (bypass most of the rest of this function).
1774 * Set up new rate table in uCode only if old rate is not supported
1775 * in current association (use new rate found above).
1776 */
1777 fail_count = window->counter - window->success_counter;
1778 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1779 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
1780 IWL_DEBUG_RATE("LQ: still below TH. succ=%d total=%d "
1781 "for index %d\n",
1782 window->success_counter, window->counter, index);
1783
1784 /* Can't calculate this yet; not enough history */
1785 window->average_tpt = IWL_INVALID_VALUE;
1786
1787 /* Should we stay with this modulation mode,
1788 * or search for a new one? */
1789 rs_stay_in_table(lq_sta);
1790
1791 goto out;
1792 }
1793
1794 /* Else we have enough samples; calculate estimate of
1795 * actual average throughput */
1796
1797 BUG_ON(window->average_tpt != ((window->success_ratio *
1798 tbl->expected_tpt[index] + 64) / 128));
1799
1800 /* If we are searching for better modulation mode, check success. */
1801 if (lq_sta->search_better_tbl) {
1802
1803 /* If good success, continue using the "search" mode;
1804 * no need to send new link quality command, since we're
1805 * continuing to use the setup that we've been trying. */
1806 if (window->average_tpt > lq_sta->last_tpt) {
1807
1808 IWL_DEBUG_RATE("LQ: SWITCHING TO NEW TABLE "
1809 "suc=%d cur-tpt=%d old-tpt=%d\n",
1810 window->success_ratio,
1811 window->average_tpt,
1812 lq_sta->last_tpt);
1813
1814 if (!is_legacy(tbl->lq_type))
1815 lq_sta->enable_counter = 1;
1816
1817 /* Swap tables; "search" becomes "active" */
1818 lq_sta->active_tbl = active_tbl;
1819 current_tpt = window->average_tpt;
1820
1821 /* Else poor success; go back to mode in "active" table */
1822 } else {
1823
1824 IWL_DEBUG_RATE("LQ: GOING BACK TO THE OLD TABLE "
1825 "suc=%d cur-tpt=%d old-tpt=%d\n",
1826 window->success_ratio,
1827 window->average_tpt,
1828 lq_sta->last_tpt);
1829
1830 /* Nullify "search" table */
1831 tbl->lq_type = LQ_NONE;
1832
1833 /* Revert to "active" table */
1834 active_tbl = lq_sta->active_tbl;
1835 tbl = &(lq_sta->lq_info[active_tbl]);
1836
1837 /* Revert to "active" rate and throughput info */
1838 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1839 current_tpt = lq_sta->last_tpt;
1840
1841 /* Need to set up a new rate table in uCode */
1842 update_lq = 1;
1843 }
1844
1845 /* Either way, we've made a decision; modulation mode
1846 * search is done, allow rate adjustment next time. */
1847 lq_sta->search_better_tbl = 0;
1848 done_search = 1; /* Don't switch modes below! */
1849 goto lq_update;
1850 }
1851
1852 /* (Else) not in search of better modulation mode, try for better
1853 * starting rate, while staying in this mode. */
1854 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
1855 tbl->lq_type);
1856 low = high_low & 0xff;
1857 high = (high_low >> 8) & 0xff;
1858
1859 sr = window->success_ratio;
1860
1861 /* Collect measured throughputs for current and adjacent rates */
1862 current_tpt = window->average_tpt;
1863 if (low != IWL_RATE_INVALID)
1864 low_tpt = tbl->win[low].average_tpt;
1865 if (high != IWL_RATE_INVALID)
1866 high_tpt = tbl->win[high].average_tpt;
1867
1868 scale_action = 0;
1869
1870 /* Too many failures, decrease rate */
1871 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
1872 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1873 scale_action = -1;
1874
1875 /* No throughput measured yet for adjacent rates; try increase. */
1876 } else if ((low_tpt == IWL_INVALID_VALUE) &&
1877 (high_tpt == IWL_INVALID_VALUE)) {
1878
1879 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
1880 scale_action = 1;
1881 else if (low != IWL_RATE_INVALID)
1882 scale_action = -1;
1883 }
1884
1885 /* Both adjacent throughputs are measured, but neither one has better
1886 * throughput; we're using the best rate, don't change it! */
1887 else if ((low_tpt != IWL_INVALID_VALUE) &&
1888 (high_tpt != IWL_INVALID_VALUE) &&
1889 (low_tpt < current_tpt) &&
1890 (high_tpt < current_tpt))
1891 scale_action = 0;
1892
1893 /* At least one adjacent rate's throughput is measured,
1894 * and may have better performance. */
1895 else {
1896 /* Higher adjacent rate's throughput is measured */
1897 if (high_tpt != IWL_INVALID_VALUE) {
1898 /* Higher rate has better throughput */
1899 if (high_tpt > current_tpt &&
1900 sr >= IWL_RATE_INCREASE_TH) {
1901 scale_action = 1;
1902 } else {
1903 IWL_DEBUG_RATE
1904 ("decrease rate because of high tpt\n");
1905 scale_action = -1;
1906 }
1907
1908 /* Lower adjacent rate's throughput is measured */
1909 } else if (low_tpt != IWL_INVALID_VALUE) {
1910 /* Lower rate has better throughput */
1911 if (low_tpt > current_tpt) {
1912 IWL_DEBUG_RATE
1913 ("decrease rate because of low tpt\n");
1914 scale_action = -1;
1915 } else if (sr >= IWL_RATE_INCREASE_TH) {
1916 scale_action = 1;
1917 }
1918 }
1919 }
1920
1921 /* Sanity check; asked for decrease, but success rate or throughput
1922 * has been good at old rate. Don't change it. */
1923 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
1924 ((sr > IWL_RATE_HIGH_TH) ||
1925 (current_tpt > (100 * tbl->expected_tpt[low]))))
1926 scale_action = 0;
1927
1928 switch (scale_action) {
1929 case -1:
1930 /* Decrease starting rate, update uCode's rate table */
1931 if (low != IWL_RATE_INVALID) {
1932 update_lq = 1;
1933 index = low;
1934 }
1935 break;
1936 case 1:
1937 /* Increase starting rate, update uCode's rate table */
1938 if (high != IWL_RATE_INVALID) {
1939 update_lq = 1;
1940 index = high;
1941 }
1942
1943 break;
1944 case 0:
1945 /* No change */
1946 default:
1947 break;
1948 }
1949
1950 IWL_DEBUG_RATE("choose rate scale index %d action %d low %d "
1951 "high %d type %d\n",
1952 index, scale_action, low, high, tbl->lq_type);
1953
1954 lq_update:
1955 /* Replace uCode's rate table for the destination station. */
1956 if (update_lq) {
1957 rate = rate_n_flags_from_tbl(tbl, index, is_green);
1958 rs_fill_link_cmd(priv, lq_sta, rate);
1959 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1960 }
1961
1962 /* Should we stay with this modulation mode, or search for a new one? */
1963 rs_stay_in_table(lq_sta);
1964
1965 /*
1966 * Search for new modulation mode if we're:
1967 * 1) Not changing rates right now
1968 * 2) Not just finishing up a search
1969 * 3) Allowing a new search
1970 */
1971 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
1972 /* Save current throughput to compare with "search" throughput*/
1973 lq_sta->last_tpt = current_tpt;
1974
1975 /* Select a new "search" modulation mode to try.
1976 * If one is found, set up the new "search" table. */
1977 if (is_legacy(tbl->lq_type))
1978 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
1979 else if (is_siso(tbl->lq_type))
1980 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
1981 else
1982 rs_move_mimo_to_other(priv, lq_sta, conf, sta, index);
1983
1984 /* If new "search" mode was selected, set up in uCode table */
1985 if (lq_sta->search_better_tbl) {
1986 /* Access the "search" table, clear its history. */
1987 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1988 for (i = 0; i < IWL_RATE_COUNT; i++)
1989 rs_rate_scale_clear_window(&(tbl->win[i]));
1990
1991 /* Use new "search" start rate */
1992 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1993
1994 IWL_DEBUG_RATE("Switch current mcs: %X index: %d\n",
1995 tbl->current_rate, index);
1996 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
1997 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1998 }
1999
2000 /* If the "active" (non-search) mode was legacy,
2001 * and we've tried switching antennas,
2002 * but we haven't been able to try HT modes (not available),
2003 * stay with best antenna legacy modulation for a while
2004 * before next round of mode comparisons. */
2005 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2006 if (is_legacy(tbl1->lq_type) &&
2007 (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)) &&
2008 (lq_sta->action_counter >= 1)) {
2009 lq_sta->action_counter = 0;
2010 IWL_DEBUG_RATE("LQ: STAY in legacy table\n");
2011 rs_set_stay_in_table(priv, 1, lq_sta);
2012 }
2013
2014 /* If we're in an HT mode, and all 3 mode switch actions
2015 * have been tried and compared, stay in this best modulation
2016 * mode for a while before next round of mode comparisons. */
2017 if (lq_sta->enable_counter &&
2018 (lq_sta->action_counter >= IWL_ACTION_LIMIT)) {
2019 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2020 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2021 (tid != MAX_TID_COUNT)) {
2022 IWL_DEBUG_RATE("try to aggregate tid %d\n", tid);
2023 rs_tl_turn_on_agg(priv, tid, lq_sta, sta);
2024 }
2025 lq_sta->action_counter = 0;
2026 rs_set_stay_in_table(priv, 0, lq_sta);
2027 }
2028
2029 /*
2030 * Else, don't search for a new modulation mode.
2031 * Put new timestamp in stay-in-modulation-mode flush timer if:
2032 * 1) Not changing rates right now
2033 * 2) Not just finishing up a search
2034 * 3) flush timer is empty
2035 */
2036 } else {
2037 if ((!update_lq) && (!done_search) && (!lq_sta->flush_timer))
2038 lq_sta->flush_timer = jiffies;
2039 }
2040
2041 out:
2042 tbl->current_rate = rate_n_flags_from_tbl(tbl, index, is_green);
2043 i = index;
2044 lq_sta->last_txrate_idx = i;
2045
2046 return;
2047 }
2048
2049
2050 static void rs_initialize_lq(struct iwl_priv *priv,
2051 struct ieee80211_conf *conf,
2052 struct ieee80211_sta *sta,
2053 struct iwl_lq_sta *lq_sta)
2054 {
2055 struct iwl_scale_tbl_info *tbl;
2056 int rate_idx;
2057 int i;
2058 u32 rate;
2059 u8 use_green = rs_use_green(priv, conf);
2060 u8 active_tbl = 0;
2061 u8 valid_tx_ant;
2062
2063 if (!sta || !lq_sta)
2064 goto out;
2065
2066 i = lq_sta->last_txrate_idx;
2067
2068 if ((lq_sta->lq.sta_id == 0xff) &&
2069 (priv->iw_mode == NL80211_IFTYPE_ADHOC))
2070 goto out;
2071
2072 valid_tx_ant = priv->hw_params.valid_tx_ant;
2073
2074 if (!lq_sta->search_better_tbl)
2075 active_tbl = lq_sta->active_tbl;
2076 else
2077 active_tbl = 1 - lq_sta->active_tbl;
2078
2079 tbl = &(lq_sta->lq_info[active_tbl]);
2080
2081 if ((i < 0) || (i >= IWL_RATE_COUNT))
2082 i = 0;
2083
2084 /* FIXME:RS: This is also wrong in 4965 */
2085 rate = iwl_rates[i].plcp;
2086 rate |= RATE_MCS_ANT_B_MSK;
2087 rate &= ~RATE_MCS_ANT_A_MSK;
2088
2089 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2090 rate |= RATE_MCS_CCK_MSK;
2091
2092 tbl->ant_type = ANT_B;
2093 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2094 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2095 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2096
2097 rate = rate_n_flags_from_tbl(tbl, rate_idx, use_green);
2098 tbl->current_rate = rate;
2099 rs_set_expected_tpt_table(lq_sta, tbl);
2100 rs_fill_link_cmd(NULL, lq_sta, rate);
2101 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2102 out:
2103 return;
2104 }
2105
2106 static void rs_get_rate(void *priv_r, struct ieee80211_supported_band *sband,
2107 struct ieee80211_sta *sta, void *priv_sta,
2108 struct sk_buff *skb, struct rate_selection *sel)
2109 {
2110
2111 int i;
2112 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2113 struct ieee80211_conf *conf = &priv->hw->conf;
2114 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2115 __le16 fc;
2116 struct iwl_lq_sta *lq_sta;
2117
2118 IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2119
2120 /* Send management frames and broadcast/multicast data using lowest
2121 * rate. */
2122 fc = hdr->frame_control;
2123 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1) ||
2124 !sta || !priv_sta) {
2125 sel->rate_idx = rate_lowest_index(sband, sta);
2126 return;
2127 }
2128
2129 lq_sta = (struct iwl_lq_sta *)priv_sta;
2130 i = lq_sta->last_txrate_idx;
2131
2132 if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
2133 !lq_sta->ibss_sta_added) {
2134 u8 sta_id = iwl_find_station(priv, hdr->addr1);
2135 DECLARE_MAC_BUF(mac);
2136
2137 if (sta_id == IWL_INVALID_STATION) {
2138 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2139 print_mac(mac, hdr->addr1));
2140 sta_id = iwl_add_station_flags(priv, hdr->addr1,
2141 0, CMD_ASYNC, NULL);
2142 }
2143 if ((sta_id != IWL_INVALID_STATION)) {
2144 lq_sta->lq.sta_id = sta_id;
2145 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2146 lq_sta->ibss_sta_added = 1;
2147 rs_initialize_lq(priv, conf, sta, lq_sta);
2148 }
2149 }
2150
2151 if ((i < 0) || (i > IWL_RATE_COUNT)) {
2152 sel->rate_idx = rate_lowest_index(sband, sta);
2153 return;
2154 }
2155
2156 if (sband->band == IEEE80211_BAND_5GHZ)
2157 i -= IWL_FIRST_OFDM_RATE;
2158 sel->rate_idx = i;
2159 }
2160
2161 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2162 gfp_t gfp)
2163 {
2164 struct iwl_lq_sta *lq_sta;
2165 struct iwl_priv *priv;
2166 int i, j;
2167
2168 priv = (struct iwl_priv *)priv_rate;
2169 IWL_DEBUG_RATE("create station rate scale window\n");
2170
2171 lq_sta = kzalloc(sizeof(struct iwl_lq_sta), gfp);
2172
2173 if (lq_sta == NULL)
2174 return NULL;
2175 lq_sta->lq.sta_id = 0xff;
2176
2177
2178 for (j = 0; j < LQ_SIZE; j++)
2179 for (i = 0; i < IWL_RATE_COUNT; i++)
2180 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2181
2182 return lq_sta;
2183 }
2184
2185 static void rs_rate_init(void *priv_r, struct ieee80211_supported_band *sband,
2186 struct ieee80211_sta *sta, void *priv_sta)
2187 {
2188 int i, j;
2189 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2190 struct ieee80211_conf *conf = &priv->hw->conf;
2191 struct iwl_lq_sta *lq_sta = priv_sta;
2192
2193 lq_sta->flush_timer = 0;
2194 lq_sta->supp_rates = sta->supp_rates[sband->band];
2195 for (j = 0; j < LQ_SIZE; j++)
2196 for (i = 0; i < IWL_RATE_COUNT; i++)
2197 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2198
2199 IWL_DEBUG_RATE("LQ: *** rate scale station global init ***\n");
2200 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2201 * the lowest or the highest rate.. Could consider using RSSI from
2202 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2203 * after assoc.. */
2204
2205 lq_sta->ibss_sta_added = 0;
2206 if (priv->iw_mode == NL80211_IFTYPE_AP) {
2207 u8 sta_id = iwl_find_station(priv, sta->addr);
2208 DECLARE_MAC_BUF(mac);
2209
2210 /* for IBSS the call are from tasklet */
2211 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2212 print_mac(mac, sta->addr));
2213
2214 if (sta_id == IWL_INVALID_STATION) {
2215 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2216 print_mac(mac, sta->addr));
2217 sta_id = iwl_add_station_flags(priv, sta->addr,
2218 0, CMD_ASYNC, NULL);
2219 }
2220 if ((sta_id != IWL_INVALID_STATION)) {
2221 lq_sta->lq.sta_id = sta_id;
2222 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2223 }
2224 /* FIXME: this is w/a remove it later */
2225 priv->assoc_station_added = 1;
2226 }
2227
2228 /* Find highest tx rate supported by hardware and destination station */
2229 lq_sta->last_txrate_idx = 3;
2230 for (i = 0; i < sband->n_bitrates; i++)
2231 if (sta->supp_rates[sband->band] & BIT(i))
2232 lq_sta->last_txrate_idx = i;
2233
2234 /* For MODE_IEEE80211A, skip over cck rates in global rate table */
2235 if (sband->band == IEEE80211_BAND_5GHZ)
2236 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2237
2238 lq_sta->is_dup = 0;
2239 lq_sta->is_green = rs_use_green(priv, conf);
2240 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2241 lq_sta->active_rate_basic = priv->active_rate_basic;
2242 lq_sta->band = priv->band;
2243 /*
2244 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2245 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2246 */
2247 lq_sta->active_siso_rate = conf->ht_conf.supp_mcs_set[0] << 1;
2248 lq_sta->active_siso_rate |= conf->ht_conf.supp_mcs_set[0] & 0x1;
2249 lq_sta->active_siso_rate &= ~((u16)0x2);
2250 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2251
2252 /* Same here */
2253 lq_sta->active_mimo2_rate = conf->ht_conf.supp_mcs_set[1] << 1;
2254 lq_sta->active_mimo2_rate |= conf->ht_conf.supp_mcs_set[1] & 0x1;
2255 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2256 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2257
2258 lq_sta->active_mimo3_rate = conf->ht_conf.supp_mcs_set[2] << 1;
2259 lq_sta->active_mimo3_rate |= conf->ht_conf.supp_mcs_set[2] & 0x1;
2260 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2261 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2262
2263 IWL_DEBUG_RATE("SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2264 lq_sta->active_siso_rate,
2265 lq_sta->active_mimo2_rate,
2266 lq_sta->active_mimo3_rate);
2267
2268 /* These values will be overriden later */
2269 lq_sta->lq.general_params.single_stream_ant_msk = ANT_A;
2270 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2271
2272 /* as default allow aggregation for all tids */
2273 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2274 lq_sta->drv = priv;
2275
2276 rs_initialize_lq(priv, conf, sta, lq_sta);
2277 }
2278
2279 static void rs_fill_link_cmd(const struct iwl_priv *priv,
2280 struct iwl_lq_sta *lq_sta, u32 new_rate)
2281 {
2282 struct iwl_scale_tbl_info tbl_type;
2283 int index = 0;
2284 int rate_idx;
2285 int repeat_rate = 0;
2286 u8 ant_toggle_cnt = 0;
2287 u8 use_ht_possible = 1;
2288 u8 valid_tx_ant = 0;
2289 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2290
2291 /* Override starting rate (index 0) if needed for debug purposes */
2292 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2293
2294 /* Interpret new_rate (rate_n_flags) */
2295 memset(&tbl_type, 0, sizeof(tbl_type));
2296 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2297 &tbl_type, &rate_idx);
2298
2299 /* How many times should we repeat the initial rate? */
2300 if (is_legacy(tbl_type.lq_type)) {
2301 ant_toggle_cnt = 1;
2302 repeat_rate = IWL_NUMBER_TRY;
2303 } else {
2304 repeat_rate = IWL_HT_NUMBER_TRY;
2305 }
2306
2307 lq_cmd->general_params.mimo_delimiter =
2308 is_mimo(tbl_type.lq_type) ? 1 : 0;
2309
2310 /* Fill 1st table entry (index 0) */
2311 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2312
2313 if (num_of_ant(tbl_type.ant_type) == 1) {
2314 lq_cmd->general_params.single_stream_ant_msk =
2315 tbl_type.ant_type;
2316 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2317 lq_cmd->general_params.dual_stream_ant_msk =
2318 tbl_type.ant_type;
2319 } /* otherwise we don't modify the existing value */
2320
2321 index++;
2322 repeat_rate--;
2323
2324 if (priv)
2325 valid_tx_ant = priv->hw_params.valid_tx_ant;
2326
2327 /* Fill rest of rate table */
2328 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2329 /* Repeat initial/next rate.
2330 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2331 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2332 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2333 if (is_legacy(tbl_type.lq_type)) {
2334 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2335 ant_toggle_cnt++;
2336 else if (priv &&
2337 rs_toggle_antenna(valid_tx_ant,
2338 &new_rate, &tbl_type))
2339 ant_toggle_cnt = 1;
2340 }
2341
2342 /* Override next rate if needed for debug purposes */
2343 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2344
2345 /* Fill next table entry */
2346 lq_cmd->rs_table[index].rate_n_flags =
2347 cpu_to_le32(new_rate);
2348 repeat_rate--;
2349 index++;
2350 }
2351
2352 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2353 &rate_idx);
2354
2355 /* Indicate to uCode which entries might be MIMO.
2356 * If initial rate was MIMO, this will finally end up
2357 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2358 if (is_mimo(tbl_type.lq_type))
2359 lq_cmd->general_params.mimo_delimiter = index;
2360
2361 /* Get next rate */
2362 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2363 use_ht_possible);
2364
2365 /* How many times should we repeat the next rate? */
2366 if (is_legacy(tbl_type.lq_type)) {
2367 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2368 ant_toggle_cnt++;
2369 else if (priv &&
2370 rs_toggle_antenna(valid_tx_ant,
2371 &new_rate, &tbl_type))
2372 ant_toggle_cnt = 1;
2373
2374 repeat_rate = IWL_NUMBER_TRY;
2375 } else {
2376 repeat_rate = IWL_HT_NUMBER_TRY;
2377 }
2378
2379 /* Don't allow HT rates after next pass.
2380 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2381 use_ht_possible = 0;
2382
2383 /* Override next rate if needed for debug purposes */
2384 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2385
2386 /* Fill next table entry */
2387 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2388
2389 index++;
2390 repeat_rate--;
2391 }
2392
2393 lq_cmd->agg_params.agg_frame_cnt_limit = 64;
2394 lq_cmd->agg_params.agg_dis_start_th = 3;
2395 lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
2396 }
2397
2398 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2399 {
2400 return hw->priv;
2401 }
2402 /* rate scale requires free function to be implemented */
2403 static void rs_free(void *priv_rate)
2404 {
2405 return;
2406 }
2407
2408 static void rs_clear(void *priv_rate)
2409 {
2410 #ifdef CONFIG_IWLWIFI_DEBUG
2411 struct iwl_priv *priv = (struct iwl_priv *) priv_rate;
2412
2413 IWL_DEBUG_RATE("enter\n");
2414
2415 /* TODO - add rate scale state reset */
2416
2417 IWL_DEBUG_RATE("leave\n");
2418 #endif /* CONFIG_IWLWIFI_DEBUG */
2419 }
2420
2421 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
2422 void *priv_sta)
2423 {
2424 struct iwl_lq_sta *lq_sta = priv_sta;
2425 struct iwl_priv *priv = priv_r;
2426
2427 IWL_DEBUG_RATE("enter\n");
2428 kfree(lq_sta);
2429 IWL_DEBUG_RATE("leave\n");
2430 }
2431
2432
2433 #ifdef CONFIG_MAC80211_DEBUGFS
2434 static int open_file_generic(struct inode *inode, struct file *file)
2435 {
2436 file->private_data = inode->i_private;
2437 return 0;
2438 }
2439 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2440 u32 *rate_n_flags, int index)
2441 {
2442 struct iwl_priv *priv;
2443
2444 priv = lq_sta->drv;
2445 if (lq_sta->dbg_fixed_rate) {
2446 if (index < 12) {
2447 *rate_n_flags = lq_sta->dbg_fixed_rate;
2448 } else {
2449 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2450 *rate_n_flags = 0x800D;
2451 else
2452 *rate_n_flags = 0x820A;
2453 }
2454 IWL_DEBUG_RATE("Fixed rate ON\n");
2455 } else {
2456 IWL_DEBUG_RATE("Fixed rate OFF\n");
2457 }
2458 }
2459
2460 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2461 const char __user *user_buf, size_t count, loff_t *ppos)
2462 {
2463 struct iwl_lq_sta *lq_sta = file->private_data;
2464 struct iwl_priv *priv;
2465 char buf[64];
2466 int buf_size;
2467 u32 parsed_rate;
2468
2469 priv = lq_sta->drv;
2470 memset(buf, 0, sizeof(buf));
2471 buf_size = min(count, sizeof(buf) - 1);
2472 if (copy_from_user(buf, user_buf, buf_size))
2473 return -EFAULT;
2474
2475 if (sscanf(buf, "%x", &parsed_rate) == 1)
2476 lq_sta->dbg_fixed_rate = parsed_rate;
2477 else
2478 lq_sta->dbg_fixed_rate = 0;
2479
2480 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2481 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2482 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2483 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2484
2485 IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2486 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2487
2488 if (lq_sta->dbg_fixed_rate) {
2489 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2490 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2491 }
2492
2493 return count;
2494 }
2495
2496 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2497 char __user *user_buf, size_t count, loff_t *ppos)
2498 {
2499 char buff[1024];
2500 int desc = 0;
2501 int i = 0;
2502
2503 struct iwl_lq_sta *lq_sta = file->private_data;
2504
2505 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2506 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2507 lq_sta->total_failed, lq_sta->total_success,
2508 lq_sta->active_legacy_rate);
2509 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2510 lq_sta->dbg_fixed_rate);
2511 desc += sprintf(buff+desc, "general:"
2512 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2513 lq_sta->lq.general_params.flags,
2514 lq_sta->lq.general_params.mimo_delimiter,
2515 lq_sta->lq.general_params.single_stream_ant_msk,
2516 lq_sta->lq.general_params.dual_stream_ant_msk);
2517
2518 desc += sprintf(buff+desc, "agg:"
2519 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2520 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2521 lq_sta->lq.agg_params.agg_dis_start_th,
2522 lq_sta->lq.agg_params.agg_frame_cnt_limit);
2523
2524 desc += sprintf(buff+desc,
2525 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2526 lq_sta->lq.general_params.start_rate_index[0],
2527 lq_sta->lq.general_params.start_rate_index[1],
2528 lq_sta->lq.general_params.start_rate_index[2],
2529 lq_sta->lq.general_params.start_rate_index[3]);
2530
2531
2532 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2533 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
2534 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2535
2536 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2537 }
2538
2539 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2540 .write = rs_sta_dbgfs_scale_table_write,
2541 .read = rs_sta_dbgfs_scale_table_read,
2542 .open = open_file_generic,
2543 };
2544 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2545 char __user *user_buf, size_t count, loff_t *ppos)
2546 {
2547 char buff[1024];
2548 int desc = 0;
2549 int i, j;
2550
2551 struct iwl_lq_sta *lq_sta = file->private_data;
2552 for (i = 0; i < LQ_SIZE; i++) {
2553 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2554 "rate=0x%X\n",
2555 lq_sta->active_tbl == i?"*":"x",
2556 lq_sta->lq_info[i].lq_type,
2557 lq_sta->lq_info[i].is_SGI,
2558 lq_sta->lq_info[i].is_fat,
2559 lq_sta->lq_info[i].is_dup,
2560 lq_sta->lq_info[i].current_rate);
2561 for (j = 0; j < IWL_RATE_COUNT; j++) {
2562 desc += sprintf(buff+desc,
2563 "counter=%d success=%d %%=%d\n",
2564 lq_sta->lq_info[i].win[j].counter,
2565 lq_sta->lq_info[i].win[j].success_counter,
2566 lq_sta->lq_info[i].win[j].success_ratio);
2567 }
2568 }
2569 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2570 }
2571
2572 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2573 .read = rs_sta_dbgfs_stats_table_read,
2574 .open = open_file_generic,
2575 };
2576
2577 static void rs_add_debugfs(void *priv, void *priv_sta,
2578 struct dentry *dir)
2579 {
2580 struct iwl_lq_sta *lq_sta = priv_sta;
2581 lq_sta->rs_sta_dbgfs_scale_table_file =
2582 debugfs_create_file("rate_scale_table", 0600, dir,
2583 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2584 lq_sta->rs_sta_dbgfs_stats_table_file =
2585 debugfs_create_file("rate_stats_table", 0600, dir,
2586 lq_sta, &rs_sta_dbgfs_stats_table_ops);
2587 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2588 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
2589 &lq_sta->tx_agg_tid_en);
2590
2591 }
2592
2593 static void rs_remove_debugfs(void *priv, void *priv_sta)
2594 {
2595 struct iwl_lq_sta *lq_sta = priv_sta;
2596 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2597 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2598 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2599 }
2600 #endif
2601
2602 static struct rate_control_ops rs_ops = {
2603 .module = NULL,
2604 .name = RS_NAME,
2605 .tx_status = rs_tx_status,
2606 .get_rate = rs_get_rate,
2607 .rate_init = rs_rate_init,
2608 .clear = rs_clear,
2609 .alloc = rs_alloc,
2610 .free = rs_free,
2611 .alloc_sta = rs_alloc_sta,
2612 .free_sta = rs_free_sta,
2613 #ifdef CONFIG_MAC80211_DEBUGFS
2614 .add_sta_debugfs = rs_add_debugfs,
2615 .remove_sta_debugfs = rs_remove_debugfs,
2616 #endif
2617 };
2618
2619 int iwlagn_rate_control_register(void)
2620 {
2621 return ieee80211_rate_control_register(&rs_ops);
2622 }
2623
2624 void iwlagn_rate_control_unregister(void)
2625 {
2626 ieee80211_rate_control_unregister(&rs_ops);
2627 }
2628
Linux kernel - Deliverables
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