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iwlwifi: Remove unnecessary code
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / net / wireless / iwlwifi / iwl-4965-rs.c
blobc7ebb3bf06f5fd50cdc9e8415583e01cbb78f6f7
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 "../net/mac80211/rate.h"
39
40 #include "iwl-dev.h"
41 #include "iwl-sta.h"
42 #include "iwl-core.h"
43 #include "iwl-helpers.h"
44
45 #define RS_NAME "iwl-4965-rs"
46
47 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
48 #define IWL_NUMBER_TRY 1
49 #define IWL_HT_NUMBER_TRY 3
50
51 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
52 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
53 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
54
55 /* max time to accum history 2 seconds */
56 #define IWL_RATE_SCALE_FLUSH_INTVL (2*HZ)
57
58 static u8 rs_ht_to_legacy[] = {
59 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
60 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
61 IWL_RATE_6M_INDEX,
62 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
63 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
64 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
65 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
66 };
67
68 static const u8 ant_toggle_lookup[] = {
69 /*ANT_NONE -> */ ANT_NONE,
70 /*ANT_A -> */ ANT_B,
71 /*ANT_B -> */ ANT_C,
72 /*ANT_AB -> */ ANT_BC,
73 /*ANT_C -> */ ANT_A,
74 /*ANT_AC -> */ ANT_AB,
75 /*ANT_BC -> */ ANT_AC,
76 /*ANT_ABC -> */ ANT_ABC,
77 };
78
79 /**
80 * struct iwl4965_rate_scale_data -- tx success history for one rate
81 */
82 struct iwl4965_rate_scale_data {
83 u64 data; /* bitmap of successful frames */
84 s32 success_counter; /* number of frames successful */
85 s32 success_ratio; /* per-cent * 128 */
86 s32 counter; /* number of frames attempted */
87 s32 average_tpt; /* success ratio * expected throughput */
88 unsigned long stamp;
89 };
90
91 /**
92 * struct iwl4965_scale_tbl_info -- tx params and success history for all rates
93 *
94 * There are two of these in struct iwl4965_lq_sta,
95 * one for "active", and one for "search".
96 */
97 struct iwl4965_scale_tbl_info {
98 enum iwl_table_type lq_type;
99 u8 ant_type;
100 u8 is_SGI; /* 1 = short guard interval */
101 u8 is_fat; /* 1 = 40 MHz channel width */
102 u8 is_dup; /* 1 = duplicated data streams */
103 u8 action; /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
104 s32 *expected_tpt; /* throughput metrics; expected_tpt_G, etc. */
105 u32 current_rate; /* rate_n_flags, uCode API format */
106 struct iwl4965_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
107 };
108
109 struct iwl4965_traffic_load {
110 unsigned long time_stamp; /* age of the oldest statistics */
111 u32 packet_count[TID_QUEUE_MAX_SIZE]; /* packet count in this time
112 * slice */
113 u32 total; /* total num of packets during the
114 * last TID_MAX_TIME_DIFF */
115 u8 queue_count; /* number of queues that has
116 * been used since the last cleanup */
117 u8 head; /* start of the circular buffer */
118 };
119
120 /**
121 * struct iwl4965_lq_sta -- driver's rate scaling private structure
122 *
123 * Pointer to this gets passed back and forth between driver and mac80211.
124 */
125 struct iwl4965_lq_sta {
126 u8 active_tbl; /* index of active table, range 0-1 */
127 u8 enable_counter; /* indicates HT mode */
128 u8 stay_in_tbl; /* 1: disallow, 0: allow search for new mode */
129 u8 search_better_tbl; /* 1: currently trying alternate mode */
130 s32 last_tpt;
131
132 /* The following determine when to search for a new mode */
133 u32 table_count_limit;
134 u32 max_failure_limit; /* # failed frames before new search */
135 u32 max_success_limit; /* # successful frames before new search */
136 u32 table_count;
137 u32 total_failed; /* total failed frames, any/all rates */
138 u32 total_success; /* total successful frames, any/all rates */
139 u32 flush_timer; /* time staying in mode before new search */
140
141 u8 action_counter; /* # mode-switch actions tried */
142 u8 is_green;
143 u8 is_dup;
144 enum ieee80211_band band;
145 u8 ibss_sta_added;
146
147 /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
148 u32 supp_rates;
149 u16 active_legacy_rate;
150 u16 active_siso_rate;
151 u16 active_mimo2_rate;
152 u16 active_mimo3_rate;
153 u16 active_rate_basic;
154
155 struct iwl_link_quality_cmd lq;
156 struct iwl4965_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
157 struct iwl4965_traffic_load load[TID_MAX_LOAD_COUNT];
158 u8 tx_agg_tid_en;
159 #ifdef CONFIG_MAC80211_DEBUGFS
160 struct dentry *rs_sta_dbgfs_scale_table_file;
161 struct dentry *rs_sta_dbgfs_stats_table_file;
162 struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
163 u32 dbg_fixed_rate;
164 #endif
165 struct iwl_priv *drv;
166 };
167
168 static void rs_rate_scale_perform(struct iwl_priv *priv,
169 struct net_device *dev,
170 struct ieee80211_hdr *hdr,
171 struct sta_info *sta);
172 static void rs_fill_link_cmd(const struct iwl_priv *priv,
173 struct iwl4965_lq_sta *lq_sta,
174 u32 rate_n_flags);
175
176
177 #ifdef CONFIG_MAC80211_DEBUGFS
178 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
179 u32 *rate_n_flags, int index);
180 #else
181 static void rs_dbgfs_set_mcs(struct iwl4965_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 iwl4965_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 iwl4965_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 iwl4965_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 iwl4965_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 iwl4965_lq_sta *lq_data, u8 tid)
329 {
330 u32 curr_time = jiffies_to_msecs(jiffies);
331 u32 time_diff;
332 s32 index;
333 struct iwl4965_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 iwl4965_lq_sta *lq_data, u8 tid,
358 struct sta_info *sta)
359 {
360 unsigned long state;
361 DECLARE_MAC_BUF(mac);
362
363 spin_lock_bh(&sta->lock);
364 state = sta->ampdu_mlme.tid_state_tx[tid];
365 spin_unlock_bh(&sta->lock);
366
367 if (state == HT_AGG_STATE_IDLE &&
368 rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
369 IWL_DEBUG_HT("Starting Tx agg: STA: %s tid: %d\n",
370 print_mac(mac, sta->addr), tid);
371 ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
372 }
373 }
374
375 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
376 struct iwl4965_lq_sta *lq_data,
377 struct sta_info *sta)
378 {
379 if ((tid < TID_MAX_LOAD_COUNT))
380 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
381 else if (tid == IWL_AGG_ALL_TID)
382 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
383 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
384 }
385
386 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
387 {
388 return (!!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
389 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
390 !!(rate_n_flags & RATE_MCS_ANT_C_MSK));
391 }
392
393 /**
394 * rs_collect_tx_data - Update the success/failure sliding window
395 *
396 * We keep a sliding window of the last 62 packets transmitted
397 * at this rate. window->data contains the bitmask of successful
398 * packets.
399 */
400 static int rs_collect_tx_data(struct iwl4965_rate_scale_data *windows,
401 int scale_index, s32 tpt, int retries,
402 int successes)
403 {
404 struct iwl4965_rate_scale_data *window = NULL;
405 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
406 s32 fail_count;
407
408 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
409 return -EINVAL;
410
411 /* Select data for current tx bit rate */
412 window = &(windows[scale_index]);
413
414 /*
415 * Keep track of only the latest 62 tx frame attempts in this rate's
416 * history window; anything older isn't really relevant any more.
417 * If we have filled up the sliding window, drop the oldest attempt;
418 * if the oldest attempt (highest bit in bitmap) shows "success",
419 * subtract "1" from the success counter (this is the main reason
420 * we keep these bitmaps!).
421 */
422 while (retries > 0) {
423 if (window->counter >= IWL_RATE_MAX_WINDOW) {
424
425 /* remove earliest */
426 window->counter = IWL_RATE_MAX_WINDOW - 1;
427
428 if (window->data & mask) {
429 window->data &= ~mask;
430 window->success_counter--;
431 }
432 }
433
434 /* Increment frames-attempted counter */
435 window->counter++;
436
437 /* Shift bitmap by one frame (throw away oldest history),
438 * OR in "1", and increment "success" if this
439 * frame was successful. */
440 window->data <<= 1;;
441 if (successes > 0) {
442 window->success_counter++;
443 window->data |= 0x1;
444 successes--;
445 }
446
447 retries--;
448 }
449
450 /* Calculate current success ratio, avoid divide-by-0! */
451 if (window->counter > 0)
452 window->success_ratio = 128 * (100 * window->success_counter)
453 / window->counter;
454 else
455 window->success_ratio = IWL_INVALID_VALUE;
456
457 fail_count = window->counter - window->success_counter;
458
459 /* Calculate average throughput, if we have enough history. */
460 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
461 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
462 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
463 else
464 window->average_tpt = IWL_INVALID_VALUE;
465
466 /* Tag this window as having been updated */
467 window->stamp = jiffies;
468
469 return 0;
470 }
471
472 /*
473 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
474 */
475 /* FIXME:RS:remove this function and put the flags statically in the table */
476 static u32 rate_n_flags_from_tbl(struct iwl4965_scale_tbl_info *tbl,
477 int index, u8 use_green)
478 {
479 u32 rate_n_flags = 0;
480
481 if (is_legacy(tbl->lq_type)) {
482 rate_n_flags = iwl_rates[index].plcp;
483 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
484 rate_n_flags |= RATE_MCS_CCK_MSK;
485
486 } else if (is_Ht(tbl->lq_type)) {
487 if (index > IWL_LAST_OFDM_RATE) {
488 IWL_ERROR("invalid HT rate index %d\n", index);
489 index = IWL_LAST_OFDM_RATE;
490 }
491 rate_n_flags = RATE_MCS_HT_MSK;
492
493 if (is_siso(tbl->lq_type))
494 rate_n_flags |= iwl_rates[index].plcp_siso;
495 else if (is_mimo2(tbl->lq_type))
496 rate_n_flags |= iwl_rates[index].plcp_mimo2;
497 else
498 rate_n_flags |= iwl_rates[index].plcp_mimo3;
499 } else {
500 IWL_ERROR("Invalid tbl->lq_type %d\n", tbl->lq_type);
501 }
502
503 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
504 RATE_MCS_ANT_ABC_MSK);
505
506 if (is_Ht(tbl->lq_type)) {
507 if (tbl->is_fat) {
508 if (tbl->is_dup)
509 rate_n_flags |= RATE_MCS_DUP_MSK;
510 else
511 rate_n_flags |= RATE_MCS_FAT_MSK;
512 }
513 if (tbl->is_SGI)
514 rate_n_flags |= RATE_MCS_SGI_MSK;
515
516 if (use_green) {
517 rate_n_flags |= RATE_MCS_GF_MSK;
518 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
519 rate_n_flags &= ~RATE_MCS_SGI_MSK;
520 IWL_ERROR("GF was set with SGI:SISO\n");
521 }
522 }
523 }
524 return rate_n_flags;
525 }
526
527 /*
528 * Interpret uCode API's rate_n_flags format,
529 * fill "search" or "active" tx mode table.
530 */
531 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
532 enum ieee80211_band band,
533 struct iwl4965_scale_tbl_info *tbl,
534 int *rate_idx)
535 {
536 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
537 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
538 u8 mcs;
539
540 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
541
542 if (*rate_idx == IWL_RATE_INVALID) {
543 *rate_idx = -1;
544 return -EINVAL;
545 }
546 tbl->is_SGI = 0; /* default legacy setup */
547 tbl->is_fat = 0;
548 tbl->is_dup = 0;
549 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
550 tbl->lq_type = LQ_NONE;
551
552 /* legacy rate format */
553 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
554 if (num_of_ant == 1) {
555 if (band == IEEE80211_BAND_5GHZ)
556 tbl->lq_type = LQ_A;
557 else
558 tbl->lq_type = LQ_G;
559 }
560 /* HT rate format */
561 } else {
562 if (rate_n_flags & RATE_MCS_SGI_MSK)
563 tbl->is_SGI = 1;
564
565 if ((rate_n_flags & RATE_MCS_FAT_MSK) ||
566 (rate_n_flags & RATE_MCS_DUP_MSK))
567 tbl->is_fat = 1;
568
569 if (rate_n_flags & RATE_MCS_DUP_MSK)
570 tbl->is_dup = 1;
571
572 mcs = rs_extract_rate(rate_n_flags);
573
574 /* SISO */
575 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
576 if (num_of_ant == 1)
577 tbl->lq_type = LQ_SISO; /*else NONE*/
578 /* MIMO2 */
579 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
580 if (num_of_ant == 2)
581 tbl->lq_type = LQ_MIMO2;
582 /* MIMO3 */
583 } else {
584 if (num_of_ant == 3)
585 tbl->lq_type = LQ_MIMO3;
586 }
587 }
588 return 0;
589 }
590
591 /* switch to another antenna/antennas and return 1 */
592 /* if no other valid antenna found, return 0 */
593 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
594 struct iwl4965_scale_tbl_info *tbl)
595 {
596 u8 new_ant_type;
597
598 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
599 return 0;
600
601 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
602 return 0;
603
604 new_ant_type = ant_toggle_lookup[tbl->ant_type];
605
606 while ((new_ant_type != tbl->ant_type) &&
607 !rs_is_valid_ant(valid_ant, new_ant_type))
608 new_ant_type = ant_toggle_lookup[new_ant_type];
609
610 if (new_ant_type == tbl->ant_type)
611 return 0;
612
613 tbl->ant_type = new_ant_type;
614 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
615 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
616 return 1;
617 }
618
619 /* FIXME:RS: in 4965 we don't use greenfield at all */
620 /* FIXME:RS: don't use greenfield for now in TX */
621 #if 0
622 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
623 {
624 return ((conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) &&
625 priv->current_ht_config.is_green_field &&
626 !priv->current_ht_config.non_GF_STA_present);
627 }
628 #endif
629 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
630 {
631 return 0;
632 }
633
634 /**
635 * rs_get_supported_rates - get the available rates
636 *
637 * if management frame or broadcast frame only return
638 * basic available rates.
639 *
640 */
641 static u16 rs_get_supported_rates(struct iwl4965_lq_sta *lq_sta,
642 struct ieee80211_hdr *hdr,
643 enum iwl_table_type rate_type)
644 {
645 if (hdr && is_multicast_ether_addr(hdr->addr1) &&
646 lq_sta->active_rate_basic)
647 return lq_sta->active_rate_basic;
648
649 if (is_legacy(rate_type)) {
650 return lq_sta->active_legacy_rate;
651 } else {
652 if (is_siso(rate_type))
653 return lq_sta->active_siso_rate;
654 else if (is_mimo2(rate_type))
655 return lq_sta->active_mimo2_rate;
656 else
657 return lq_sta->active_mimo3_rate;
658 }
659 }
660
661 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
662 int rate_type)
663 {
664 u8 high = IWL_RATE_INVALID;
665 u8 low = IWL_RATE_INVALID;
666
667 /* 802.11A or ht walks to the next literal adjacent rate in
668 * the rate table */
669 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
670 int i;
671 u32 mask;
672
673 /* Find the previous rate that is in the rate mask */
674 i = index - 1;
675 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
676 if (rate_mask & mask) {
677 low = i;
678 break;
679 }
680 }
681
682 /* Find the next rate that is in the rate mask */
683 i = index + 1;
684 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
685 if (rate_mask & mask) {
686 high = i;
687 break;
688 }
689 }
690
691 return (high << 8) | low;
692 }
693
694 low = index;
695 while (low != IWL_RATE_INVALID) {
696 low = iwl_rates[low].prev_rs;
697 if (low == IWL_RATE_INVALID)
698 break;
699 if (rate_mask & (1 << low))
700 break;
701 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
702 }
703
704 high = index;
705 while (high != IWL_RATE_INVALID) {
706 high = iwl_rates[high].next_rs;
707 if (high == IWL_RATE_INVALID)
708 break;
709 if (rate_mask & (1 << high))
710 break;
711 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
712 }
713
714 return (high << 8) | low;
715 }
716
717 static u32 rs_get_lower_rate(struct iwl4965_lq_sta *lq_sta,
718 struct iwl4965_scale_tbl_info *tbl, u8 scale_index,
719 u8 ht_possible)
720 {
721 s32 low;
722 u16 rate_mask;
723 u16 high_low;
724 u8 switch_to_legacy = 0;
725 u8 is_green = lq_sta->is_green;
726
727 /* check if we need to switch from HT to legacy rates.
728 * assumption is that mandatory rates (1Mbps or 6Mbps)
729 * are always supported (spec demand) */
730 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
731 switch_to_legacy = 1;
732 scale_index = rs_ht_to_legacy[scale_index];
733 if (lq_sta->band == IEEE80211_BAND_5GHZ)
734 tbl->lq_type = LQ_A;
735 else
736 tbl->lq_type = LQ_G;
737
738 if (num_of_ant(tbl->ant_type) > 1)
739 tbl->ant_type = ANT_A;/*FIXME:RS*/
740
741 tbl->is_fat = 0;
742 tbl->is_SGI = 0;
743 }
744
745 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
746
747 /* Mask with station rate restriction */
748 if (is_legacy(tbl->lq_type)) {
749 /* supp_rates has no CCK bits in A mode */
750 if (lq_sta->band == IEEE80211_BAND_5GHZ)
751 rate_mask = (u16)(rate_mask &
752 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
753 else
754 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
755 }
756
757 /* If we switched from HT to legacy, check current rate */
758 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
759 low = scale_index;
760 goto out;
761 }
762
763 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
764 tbl->lq_type);
765 low = high_low & 0xff;
766
767 if (low == IWL_RATE_INVALID)
768 low = scale_index;
769
770 out:
771 return rate_n_flags_from_tbl(tbl, low, is_green);
772 }
773
774 /*
775 * mac80211 sends us Tx status
776 */
777 static void rs_tx_status(void *priv_rate, struct net_device *dev,
778 struct sk_buff *skb)
779 {
780 int status;
781 u8 retries;
782 int rs_index, index = 0;
783 struct iwl4965_lq_sta *lq_sta;
784 struct iwl_link_quality_cmd *table;
785 struct sta_info *sta;
786 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
787 struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
788 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
789 struct ieee80211_hw *hw = local_to_hw(local);
790 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
791 struct iwl4965_rate_scale_data *window = NULL;
792 struct iwl4965_rate_scale_data *search_win = NULL;
793 u32 tx_rate;
794 struct iwl4965_scale_tbl_info tbl_type;
795 struct iwl4965_scale_tbl_info *curr_tbl, *search_tbl;
796 u8 active_index = 0;
797 __le16 fc = hdr->frame_control;
798 s32 tpt = 0;
799
800 IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
801
802 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1))
803 return;
804
805 /* This packet was aggregated but doesn't carry rate scale info */
806 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
807 !(info->flags & IEEE80211_TX_STAT_AMPDU))
808 return;
809
810 retries = info->status.retry_count;
811
812 if (retries > 15)
813 retries = 15;
814
815 rcu_read_lock();
816
817 sta = sta_info_get(local, hdr->addr1);
818
819 if (!sta || !sta->rate_ctrl_priv)
820 goto out;
821
822
823 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
824
825 if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
826 !lq_sta->ibss_sta_added)
827 goto out;
828
829 table = &lq_sta->lq;
830 active_index = lq_sta->active_tbl;
831
832 curr_tbl = &(lq_sta->lq_info[active_index]);
833 search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
834 window = (struct iwl4965_rate_scale_data *)
835 &(curr_tbl->win[0]);
836 search_win = (struct iwl4965_rate_scale_data *)
837 &(search_tbl->win[0]);
838
839 /*
840 * Ignore this Tx frame response if its initial rate doesn't match
841 * that of latest Link Quality command. There may be stragglers
842 * from a previous Link Quality command, but we're no longer interested
843 * in those; they're either from the "active" mode while we're trying
844 * to check "search" mode, or a prior "search" mode after we've moved
845 * to a new "search" mode (which might become the new "active" mode).
846 */
847 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
848 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
849 if (priv->band == IEEE80211_BAND_5GHZ)
850 rs_index -= IWL_FIRST_OFDM_RATE;
851
852 if ((info->tx_rate_idx < 0) ||
853 (tbl_type.is_SGI ^
854 !!(info->flags & IEEE80211_TX_CTL_SHORT_GI)) ||
855 (tbl_type.is_fat ^
856 !!(info->flags & IEEE80211_TX_CTL_40_MHZ_WIDTH)) ||
857 (tbl_type.is_dup ^
858 !!(info->flags & IEEE80211_TX_CTL_DUP_DATA)) ||
859 (tbl_type.ant_type ^ info->antenna_sel_tx) ||
860 (!!(tx_rate & RATE_MCS_HT_MSK) ^
861 !!(info->flags & IEEE80211_TX_CTL_OFDM_HT)) ||
862 (!!(tx_rate & RATE_MCS_GF_MSK) ^
863 !!(info->flags & IEEE80211_TX_CTL_GREEN_FIELD)) ||
864 (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
865 hw->wiphy->bands[info->band]->bitrates[info->tx_rate_idx].bitrate)) {
866 IWL_DEBUG_RATE("initial rate does not match 0x%x\n", tx_rate);
867 goto out;
868 }
869
870 /* Update frame history window with "failure" for each Tx retry. */
871 while (retries) {
872 /* Look up the rate and other info used for each tx attempt.
873 * Each tx attempt steps one entry deeper in the rate table. */
874 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
875 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
876 &tbl_type, &rs_index);
877
878 /* If type matches "search" table,
879 * add failure to "search" history */
880 if ((tbl_type.lq_type == search_tbl->lq_type) &&
881 (tbl_type.ant_type == search_tbl->ant_type) &&
882 (tbl_type.is_SGI == search_tbl->is_SGI)) {
883 if (search_tbl->expected_tpt)
884 tpt = search_tbl->expected_tpt[rs_index];
885 else
886 tpt = 0;
887 rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
888
889 /* Else if type matches "current/active" table,
890 * add failure to "current/active" history */
891 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
892 (tbl_type.ant_type == curr_tbl->ant_type) &&
893 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
894 if (curr_tbl->expected_tpt)
895 tpt = curr_tbl->expected_tpt[rs_index];
896 else
897 tpt = 0;
898 rs_collect_tx_data(window, rs_index, tpt, 1, 0);
899 }
900
901 /* If not searching for a new mode, increment failed counter
902 * ... this helps determine when to start searching again */
903 if (lq_sta->stay_in_tbl)
904 lq_sta->total_failed++;
905 --retries;
906 index++;
907
908 }
909
910 /*
911 * Find (by rate) the history window to update with final Tx attempt;
912 * if Tx was successful first try, use original rate,
913 * else look up the rate that was, finally, successful.
914 */
915 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
916 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
917
918 /* Update frame history window with "success" if Tx got ACKed ... */
919 status = !!(info->flags & IEEE80211_TX_STAT_ACK);
920
921 /* If type matches "search" table,
922 * add final tx status to "search" history */
923 if ((tbl_type.lq_type == search_tbl->lq_type) &&
924 (tbl_type.ant_type == search_tbl->ant_type) &&
925 (tbl_type.is_SGI == search_tbl->is_SGI)) {
926 if (search_tbl->expected_tpt)
927 tpt = search_tbl->expected_tpt[rs_index];
928 else
929 tpt = 0;
930 if (info->flags & IEEE80211_TX_CTL_AMPDU)
931 rs_collect_tx_data(search_win, rs_index, tpt,
932 info->status.ampdu_ack_len,
933 info->status.ampdu_ack_map);
934 else
935 rs_collect_tx_data(search_win, rs_index, tpt,
936 1, status);
937 /* Else if type matches "current/active" table,
938 * add final tx status to "current/active" history */
939 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
940 (tbl_type.ant_type == curr_tbl->ant_type) &&
941 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
942 if (curr_tbl->expected_tpt)
943 tpt = curr_tbl->expected_tpt[rs_index];
944 else
945 tpt = 0;
946 if (info->flags & IEEE80211_TX_CTL_AMPDU)
947 rs_collect_tx_data(window, rs_index, tpt,
948 info->status.ampdu_ack_len,
949 info->status.ampdu_ack_map);
950 else
951 rs_collect_tx_data(window, rs_index, tpt,
952 1, status);
953 }
954
955 /* If not searching for new mode, increment success/failed counter
956 * ... these help determine when to start searching again */
957 if (lq_sta->stay_in_tbl) {
958 if (info->flags & IEEE80211_TX_CTL_AMPDU) {
959 lq_sta->total_success += info->status.ampdu_ack_map;
960 lq_sta->total_failed +=
961 (info->status.ampdu_ack_len - info->status.ampdu_ack_map);
962 } else {
963 if (status)
964 lq_sta->total_success++;
965 else
966 lq_sta->total_failed++;
967 }
968 }
969
970 /* See if there's a better rate or modulation mode to try. */
971 rs_rate_scale_perform(priv, dev, hdr, sta);
972 out:
973 rcu_read_unlock();
974 return;
975 }
976
977 /*
978 * Begin a period of staying with a selected modulation mode.
979 * Set "stay_in_tbl" flag to prevent any mode switches.
980 * Set frame tx success limits according to legacy vs. high-throughput,
981 * and reset overall (spanning all rates) tx success history statistics.
982 * These control how long we stay using same modulation mode before
983 * searching for a new mode.
984 */
985 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
986 struct iwl4965_lq_sta *lq_sta)
987 {
988 IWL_DEBUG_RATE("we are staying in the same table\n");
989 lq_sta->stay_in_tbl = 1; /* only place this gets set */
990 if (is_legacy) {
991 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
992 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
993 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
994 } else {
995 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
996 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
997 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
998 }
999 lq_sta->table_count = 0;
1000 lq_sta->total_failed = 0;
1001 lq_sta->total_success = 0;
1002 }
1003
1004 /*
1005 * Find correct throughput table for given mode of modulation
1006 */
1007 static void rs_set_expected_tpt_table(struct iwl4965_lq_sta *lq_sta,
1008 struct iwl4965_scale_tbl_info *tbl)
1009 {
1010 if (is_legacy(tbl->lq_type)) {
1011 if (!is_a_band(tbl->lq_type))
1012 tbl->expected_tpt = expected_tpt_G;
1013 else
1014 tbl->expected_tpt = expected_tpt_A;
1015 } else if (is_siso(tbl->lq_type)) {
1016 if (tbl->is_fat && !lq_sta->is_dup)
1017 if (tbl->is_SGI)
1018 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
1019 else
1020 tbl->expected_tpt = expected_tpt_siso40MHz;
1021 else if (tbl->is_SGI)
1022 tbl->expected_tpt = expected_tpt_siso20MHzSGI;
1023 else
1024 tbl->expected_tpt = expected_tpt_siso20MHz;
1025
1026 } else if (is_mimo(tbl->lq_type)) { /* FIXME:need to separate mimo2/3 */
1027 if (tbl->is_fat && !lq_sta->is_dup)
1028 if (tbl->is_SGI)
1029 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
1030 else
1031 tbl->expected_tpt = expected_tpt_mimo40MHz;
1032 else if (tbl->is_SGI)
1033 tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
1034 else
1035 tbl->expected_tpt = expected_tpt_mimo20MHz;
1036 } else
1037 tbl->expected_tpt = expected_tpt_G;
1038 }
1039
1040 /*
1041 * Find starting rate for new "search" high-throughput mode of modulation.
1042 * Goal is to find lowest expected rate (under perfect conditions) that is
1043 * above the current measured throughput of "active" mode, to give new mode
1044 * a fair chance to prove itself without too many challenges.
1045 *
1046 * This gets called when transitioning to more aggressive modulation
1047 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1048 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1049 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1050 * bit rate will typically need to increase, but not if performance was bad.
1051 */
1052 static s32 rs_get_best_rate(struct iwl_priv *priv,
1053 struct iwl4965_lq_sta *lq_sta,
1054 struct iwl4965_scale_tbl_info *tbl, /* "search" */
1055 u16 rate_mask, s8 index)
1056 {
1057 /* "active" values */
1058 struct iwl4965_scale_tbl_info *active_tbl =
1059 &(lq_sta->lq_info[lq_sta->active_tbl]);
1060 s32 active_sr = active_tbl->win[index].success_ratio;
1061 s32 active_tpt = active_tbl->expected_tpt[index];
1062
1063 /* expected "search" throughput */
1064 s32 *tpt_tbl = tbl->expected_tpt;
1065
1066 s32 new_rate, high, low, start_hi;
1067 u16 high_low;
1068 s8 rate = index;
1069
1070 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1071
1072 for (; ;) {
1073 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1074 tbl->lq_type);
1075
1076 low = high_low & 0xff;
1077 high = (high_low >> 8) & 0xff;
1078
1079 /*
1080 * Lower the "search" bit rate, to give new "search" mode
1081 * approximately the same throughput as "active" if:
1082 *
1083 * 1) "Active" mode has been working modestly well (but not
1084 * great), and expected "search" throughput (under perfect
1085 * conditions) at candidate rate is above the actual
1086 * measured "active" throughput (but less than expected
1087 * "active" throughput under perfect conditions).
1088 * OR
1089 * 2) "Active" mode has been working perfectly or very well
1090 * and expected "search" throughput (under perfect
1091 * conditions) at candidate rate is above expected
1092 * "active" throughput (under perfect conditions).
1093 */
1094 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1095 ((active_sr > IWL_RATE_DECREASE_TH) &&
1096 (active_sr <= IWL_RATE_HIGH_TH) &&
1097 (tpt_tbl[rate] <= active_tpt))) ||
1098 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1099 (tpt_tbl[rate] > active_tpt))) {
1100
1101 /* (2nd or later pass)
1102 * If we've already tried to raise the rate, and are
1103 * now trying to lower it, use the higher rate. */
1104 if (start_hi != IWL_RATE_INVALID) {
1105 new_rate = start_hi;
1106 break;
1107 }
1108
1109 new_rate = rate;
1110
1111 /* Loop again with lower rate */
1112 if (low != IWL_RATE_INVALID)
1113 rate = low;
1114
1115 /* Lower rate not available, use the original */
1116 else
1117 break;
1118
1119 /* Else try to raise the "search" rate to match "active" */
1120 } else {
1121 /* (2nd or later pass)
1122 * If we've already tried to lower the rate, and are
1123 * now trying to raise it, use the lower rate. */
1124 if (new_rate != IWL_RATE_INVALID)
1125 break;
1126
1127 /* Loop again with higher rate */
1128 else if (high != IWL_RATE_INVALID) {
1129 start_hi = high;
1130 rate = high;
1131
1132 /* Higher rate not available, use the original */
1133 } else {
1134 break;
1135 }
1136 }
1137 }
1138
1139 return new_rate;
1140 }
1141
1142 /*
1143 * Set up search table for MIMO
1144 */
1145 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1146 struct iwl4965_lq_sta *lq_sta,
1147 struct ieee80211_conf *conf,
1148 struct sta_info *sta,
1149 struct iwl4965_scale_tbl_info *tbl, int index)
1150 {
1151 u16 rate_mask;
1152 s32 rate;
1153 s8 is_green = lq_sta->is_green;
1154
1155 if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1156 !sta->ht_info.ht_supported)
1157 return -1;
1158
1159 if (priv->current_ht_config.tx_mimo_ps_mode == IWL_MIMO_PS_STATIC)
1160 return -1;
1161
1162 /* Need both Tx chains/antennas to support MIMO */
1163 if (priv->hw_params.tx_chains_num < 2)
1164 return -1;
1165
1166 IWL_DEBUG_RATE("LQ: try to switch to MIMO2\n");
1167
1168 tbl->lq_type = LQ_MIMO2;
1169 tbl->is_dup = lq_sta->is_dup;
1170 tbl->action = 0;
1171 rate_mask = lq_sta->active_mimo2_rate;
1172
1173 if (priv->current_ht_config.supported_chan_width
1174 == IWL_CHANNEL_WIDTH_40MHZ)
1175 tbl->is_fat = 1;
1176 else
1177 tbl->is_fat = 0;
1178
1179 /* FIXME: - don't toggle SGI here
1180 if (tbl->is_fat) {
1181 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1182 tbl->is_SGI = 1;
1183 else
1184 tbl->is_SGI = 0;
1185 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1186 tbl->is_SGI = 1;
1187 else
1188 tbl->is_SGI = 0;
1189 */
1190
1191 rs_set_expected_tpt_table(lq_sta, tbl);
1192
1193 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1194
1195 IWL_DEBUG_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1196
1197 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1198 IWL_DEBUG_RATE("Can't switch with index %d rate mask %x\n",
1199 rate, rate_mask);
1200 return -1;
1201 }
1202 tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1203
1204 IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1205 tbl->current_rate, is_green);
1206 return 0;
1207 }
1208
1209 /*
1210 * Set up search table for SISO
1211 */
1212 static int rs_switch_to_siso(struct iwl_priv *priv,
1213 struct iwl4965_lq_sta *lq_sta,
1214 struct ieee80211_conf *conf,
1215 struct sta_info *sta,
1216 struct iwl4965_scale_tbl_info *tbl, int index)
1217 {
1218 u16 rate_mask;
1219 u8 is_green = lq_sta->is_green;
1220 s32 rate;
1221
1222 if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1223 !sta->ht_info.ht_supported)
1224 return -1;
1225
1226 IWL_DEBUG_RATE("LQ: try to switch to SISO\n");
1227
1228 tbl->is_dup = lq_sta->is_dup;
1229 tbl->lq_type = LQ_SISO;
1230 tbl->action = 0;
1231 rate_mask = lq_sta->active_siso_rate;
1232
1233 if (priv->current_ht_config.supported_chan_width
1234 == IWL_CHANNEL_WIDTH_40MHZ)
1235 tbl->is_fat = 1;
1236 else
1237 tbl->is_fat = 0;
1238
1239 /* FIXME: - don't toggle SGI here
1240 if (tbl->is_fat) {
1241 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1242 tbl->is_SGI = 1;
1243 else
1244 tbl->is_SGI = 0;
1245 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1246 tbl->is_SGI = 1;
1247 else
1248 tbl->is_SGI = 0;
1249 */
1250
1251 if (is_green)
1252 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1253
1254 rs_set_expected_tpt_table(lq_sta, tbl);
1255 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1256
1257 IWL_DEBUG_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask);
1258 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1259 IWL_DEBUG_RATE("can not switch with index %d rate mask %x\n",
1260 rate, rate_mask);
1261 return -1;
1262 }
1263 tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1264 IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1265 tbl->current_rate, is_green);
1266 return 0;
1267 }
1268
1269 /*
1270 * Try to switch to new modulation mode from legacy
1271 */
1272 static int rs_move_legacy_other(struct iwl_priv *priv,
1273 struct iwl4965_lq_sta *lq_sta,
1274 struct ieee80211_conf *conf,
1275 struct sta_info *sta,
1276 int index)
1277 {
1278 struct iwl4965_scale_tbl_info *tbl =
1279 &(lq_sta->lq_info[lq_sta->active_tbl]);
1280 struct iwl4965_scale_tbl_info *search_tbl =
1281 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1282 struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1283 u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1284 (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1285 u8 start_action = tbl->action;
1286 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1287 int ret = 0;
1288
1289 for (; ;) {
1290 switch (tbl->action) {
1291 case IWL_LEGACY_SWITCH_ANTENNA:
1292 IWL_DEBUG_RATE("LQ: Legacy toggle Antenna\n");
1293
1294 lq_sta->action_counter++;
1295
1296 /* Don't change antenna if success has been great */
1297 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1298 break;
1299
1300 /* Set up search table to try other antenna */
1301 memcpy(search_tbl, tbl, sz);
1302
1303 if (rs_toggle_antenna(valid_tx_ant,
1304 &search_tbl->current_rate, search_tbl)) {
1305 lq_sta->search_better_tbl = 1;
1306 goto out;
1307 }
1308 break;
1309 case IWL_LEGACY_SWITCH_SISO:
1310 IWL_DEBUG_RATE("LQ: Legacy switch to SISO\n");
1311
1312 /* Set up search table to try SISO */
1313 memcpy(search_tbl, tbl, sz);
1314 search_tbl->is_SGI = 0;
1315 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1316 search_tbl, index);
1317 if (!ret) {
1318 lq_sta->search_better_tbl = 1;
1319 lq_sta->action_counter = 0;
1320 goto out;
1321 }
1322
1323 break;
1324 case IWL_LEGACY_SWITCH_MIMO2:
1325 IWL_DEBUG_RATE("LQ: Legacy switch to MIMO2\n");
1326
1327 /* Set up search table to try MIMO */
1328 memcpy(search_tbl, tbl, sz);
1329 search_tbl->is_SGI = 0;
1330 search_tbl->ant_type = ANT_AB;/*FIXME:RS*/
1331 /*FIXME:RS:need to check ant validity*/
1332 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1333 search_tbl, index);
1334 if (!ret) {
1335 lq_sta->search_better_tbl = 1;
1336 lq_sta->action_counter = 0;
1337 goto out;
1338 }
1339 break;
1340 }
1341 tbl->action++;
1342 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2)
1343 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1344
1345 if (tbl->action == start_action)
1346 break;
1347
1348 }
1349 return 0;
1350
1351 out:
1352 tbl->action++;
1353 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2)
1354 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1355 return 0;
1356
1357 }
1358
1359 /*
1360 * Try to switch to new modulation mode from SISO
1361 */
1362 static int rs_move_siso_to_other(struct iwl_priv *priv,
1363 struct iwl4965_lq_sta *lq_sta,
1364 struct ieee80211_conf *conf,
1365 struct sta_info *sta,
1366 int index)
1367 {
1368 u8 is_green = lq_sta->is_green;
1369 struct iwl4965_scale_tbl_info *tbl =
1370 &(lq_sta->lq_info[lq_sta->active_tbl]);
1371 struct iwl4965_scale_tbl_info *search_tbl =
1372 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1373 struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1374 u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1375 (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1376 u8 start_action = tbl->action;
1377 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1378 int ret;
1379
1380 for (;;) {
1381 lq_sta->action_counter++;
1382 switch (tbl->action) {
1383 case IWL_SISO_SWITCH_ANTENNA:
1384 IWL_DEBUG_RATE("LQ: SISO toggle Antenna\n");
1385 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1386 break;
1387
1388 memcpy(search_tbl, tbl, sz);
1389 if (rs_toggle_antenna(valid_tx_ant,
1390 &search_tbl->current_rate, search_tbl)) {
1391 lq_sta->search_better_tbl = 1;
1392 goto out;
1393 }
1394 break;
1395 case IWL_SISO_SWITCH_MIMO2:
1396 IWL_DEBUG_RATE("LQ: SISO switch to MIMO2\n");
1397 memcpy(search_tbl, tbl, sz);
1398 search_tbl->is_SGI = 0;
1399 search_tbl->ant_type = ANT_AB; /*FIXME:RS*/
1400 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1401 search_tbl, index);
1402 if (!ret) {
1403 lq_sta->search_better_tbl = 1;
1404 goto out;
1405 }
1406 break;
1407 case IWL_SISO_SWITCH_GI:
1408 if (!tbl->is_fat &&
1409 !(priv->current_ht_config.sgf &
1410 HT_SHORT_GI_20MHZ))
1411 break;
1412 if (tbl->is_fat &&
1413 !(priv->current_ht_config.sgf &
1414 HT_SHORT_GI_40MHZ))
1415 break;
1416
1417 IWL_DEBUG_RATE("LQ: SISO toggle SGI/NGI\n");
1418
1419 memcpy(search_tbl, tbl, sz);
1420 if (is_green) {
1421 if (!tbl->is_SGI)
1422 break;
1423 else
1424 IWL_ERROR("SGI was set in GF+SISO\n");
1425 }
1426 search_tbl->is_SGI = !tbl->is_SGI;
1427 rs_set_expected_tpt_table(lq_sta, search_tbl);
1428 if (tbl->is_SGI) {
1429 s32 tpt = lq_sta->last_tpt / 100;
1430 if (tpt >= search_tbl->expected_tpt[index])
1431 break;
1432 }
1433 search_tbl->current_rate = rate_n_flags_from_tbl(
1434 search_tbl, index, is_green);
1435 lq_sta->search_better_tbl = 1;
1436 goto out;
1437 }
1438 tbl->action++;
1439 if (tbl->action > IWL_SISO_SWITCH_GI)
1440 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1441
1442 if (tbl->action == start_action)
1443 break;
1444 }
1445 return 0;
1446
1447 out:
1448 tbl->action++;
1449 if (tbl->action > IWL_SISO_SWITCH_GI)
1450 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1451 return 0;
1452 }
1453
1454 /*
1455 * Try to switch to new modulation mode from MIMO
1456 */
1457 static int rs_move_mimo_to_other(struct iwl_priv *priv,
1458 struct iwl4965_lq_sta *lq_sta,
1459 struct ieee80211_conf *conf,
1460 struct sta_info *sta,
1461 int index)
1462 {
1463 s8 is_green = lq_sta->is_green;
1464 struct iwl4965_scale_tbl_info *tbl =
1465 &(lq_sta->lq_info[lq_sta->active_tbl]);
1466 struct iwl4965_scale_tbl_info *search_tbl =
1467 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1468 u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1469 (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1470 u8 start_action = tbl->action;
1471 /*u8 valid_tx_ant = priv->hw_params.valid_tx_ant;*/
1472 int ret;
1473
1474 for (;;) {
1475 lq_sta->action_counter++;
1476 switch (tbl->action) {
1477 case IWL_MIMO_SWITCH_ANTENNA_A:
1478 case IWL_MIMO_SWITCH_ANTENNA_B:
1479 IWL_DEBUG_RATE("LQ: MIMO2 switch to SISO\n");
1480
1481 /* Set up new search table for SISO */
1482 memcpy(search_tbl, tbl, sz);
1483
1484 /*FIXME:RS:need to check ant validity + C*/
1485 if (tbl->action == IWL_MIMO_SWITCH_ANTENNA_A)
1486 search_tbl->ant_type = ANT_A;
1487 else
1488 search_tbl->ant_type = ANT_B;
1489
1490 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1491 search_tbl, index);
1492 if (!ret) {
1493 lq_sta->search_better_tbl = 1;
1494 goto out;
1495 }
1496 break;
1497
1498 case IWL_MIMO_SWITCH_GI:
1499 if (!tbl->is_fat &&
1500 !(priv->current_ht_config.sgf &
1501 HT_SHORT_GI_20MHZ))
1502 break;
1503 if (tbl->is_fat &&
1504 !(priv->current_ht_config.sgf &
1505 HT_SHORT_GI_40MHZ))
1506 break;
1507
1508 IWL_DEBUG_RATE("LQ: MIMO toggle SGI/NGI\n");
1509
1510 /* Set up new search table for MIMO */
1511 memcpy(search_tbl, tbl, sz);
1512 search_tbl->is_SGI = !tbl->is_SGI;
1513 rs_set_expected_tpt_table(lq_sta, search_tbl);
1514 /*
1515 * If active table already uses the fastest possible
1516 * modulation (dual stream with short guard interval),
1517 * and it's working well, there's no need to look
1518 * for a better type of modulation!
1519 */
1520 if (tbl->is_SGI) {
1521 s32 tpt = lq_sta->last_tpt / 100;
1522 if (tpt >= search_tbl->expected_tpt[index])
1523 break;
1524 }
1525 search_tbl->current_rate = rate_n_flags_from_tbl(
1526 search_tbl, index, is_green);
1527 lq_sta->search_better_tbl = 1;
1528 goto out;
1529
1530 }
1531 tbl->action++;
1532 if (tbl->action > IWL_MIMO_SWITCH_GI)
1533 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1534
1535 if (tbl->action == start_action)
1536 break;
1537 }
1538
1539 return 0;
1540 out:
1541 tbl->action++;
1542 if (tbl->action > IWL_MIMO_SWITCH_GI)
1543 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1544 return 0;
1545
1546 }
1547
1548 /*
1549 * Check whether we should continue using same modulation mode, or
1550 * begin search for a new mode, based on:
1551 * 1) # tx successes or failures while using this mode
1552 * 2) # times calling this function
1553 * 3) elapsed time in this mode (not used, for now)
1554 */
1555 static void rs_stay_in_table(struct iwl4965_lq_sta *lq_sta)
1556 {
1557 struct iwl4965_scale_tbl_info *tbl;
1558 int i;
1559 int active_tbl;
1560 int flush_interval_passed = 0;
1561 struct iwl_priv *priv;
1562
1563 priv = lq_sta->drv;
1564 active_tbl = lq_sta->active_tbl;
1565
1566 tbl = &(lq_sta->lq_info[active_tbl]);
1567
1568 /* If we've been disallowing search, see if we should now allow it */
1569 if (lq_sta->stay_in_tbl) {
1570
1571 /* Elapsed time using current modulation mode */
1572 if (lq_sta->flush_timer)
1573 flush_interval_passed =
1574 time_after(jiffies,
1575 (unsigned long)(lq_sta->flush_timer +
1576 IWL_RATE_SCALE_FLUSH_INTVL));
1577
1578 /*
1579 * Check if we should allow search for new modulation mode.
1580 * If many frames have failed or succeeded, or we've used
1581 * this same modulation for a long time, allow search, and
1582 * reset history stats that keep track of whether we should
1583 * allow a new search. Also (below) reset all bitmaps and
1584 * stats in active history.
1585 */
1586 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1587 (lq_sta->total_success > lq_sta->max_success_limit) ||
1588 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1589 && (flush_interval_passed))) {
1590 IWL_DEBUG_RATE("LQ: stay is expired %d %d %d\n:",
1591 lq_sta->total_failed,
1592 lq_sta->total_success,
1593 flush_interval_passed);
1594
1595 /* Allow search for new mode */
1596 lq_sta->stay_in_tbl = 0; /* only place reset */
1597 lq_sta->total_failed = 0;
1598 lq_sta->total_success = 0;
1599 lq_sta->flush_timer = 0;
1600
1601 /*
1602 * Else if we've used this modulation mode enough repetitions
1603 * (regardless of elapsed time or success/failure), reset
1604 * history bitmaps and rate-specific stats for all rates in
1605 * active table.
1606 */
1607 } else {
1608 lq_sta->table_count++;
1609 if (lq_sta->table_count >=
1610 lq_sta->table_count_limit) {
1611 lq_sta->table_count = 0;
1612
1613 IWL_DEBUG_RATE("LQ: stay in table clear win\n");
1614 for (i = 0; i < IWL_RATE_COUNT; i++)
1615 rs_rate_scale_clear_window(
1616 &(tbl->win[i]));
1617 }
1618 }
1619
1620 /* If transitioning to allow "search", reset all history
1621 * bitmaps and stats in active table (this will become the new
1622 * "search" table). */
1623 if (!lq_sta->stay_in_tbl) {
1624 for (i = 0; i < IWL_RATE_COUNT; i++)
1625 rs_rate_scale_clear_window(&(tbl->win[i]));
1626 }
1627 }
1628 }
1629
1630 /*
1631 * Do rate scaling and search for new modulation mode.
1632 */
1633 static void rs_rate_scale_perform(struct iwl_priv *priv,
1634 struct net_device *dev,
1635 struct ieee80211_hdr *hdr,
1636 struct sta_info *sta)
1637 {
1638 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1639 struct ieee80211_hw *hw = local_to_hw(local);
1640 struct ieee80211_conf *conf = &hw->conf;
1641 int low = IWL_RATE_INVALID;
1642 int high = IWL_RATE_INVALID;
1643 int index;
1644 int i;
1645 struct iwl4965_rate_scale_data *window = NULL;
1646 int current_tpt = IWL_INVALID_VALUE;
1647 int low_tpt = IWL_INVALID_VALUE;
1648 int high_tpt = IWL_INVALID_VALUE;
1649 u32 fail_count;
1650 s8 scale_action = 0;
1651 __le16 fc;
1652 u16 rate_mask;
1653 u8 update_lq = 0;
1654 struct iwl4965_lq_sta *lq_sta;
1655 struct iwl4965_scale_tbl_info *tbl, *tbl1;
1656 u16 rate_scale_index_msk = 0;
1657 u32 rate;
1658 u8 is_green = 0;
1659 u8 active_tbl = 0;
1660 u8 done_search = 0;
1661 u16 high_low;
1662 s32 sr;
1663 u8 tid = MAX_TID_COUNT;
1664
1665 IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1666
1667 fc = hdr->frame_control;
1668 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
1669 /* Send management frames and broadcast/multicast data using
1670 * lowest rate. */
1671 /* TODO: this could probably be improved.. */
1672 return;
1673 }
1674
1675 if (!sta || !sta->rate_ctrl_priv)
1676 return;
1677
1678 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
1679
1680 tid = rs_tl_add_packet(lq_sta, hdr);
1681
1682 /*
1683 * Select rate-scale / modulation-mode table to work with in
1684 * the rest of this function: "search" if searching for better
1685 * modulation mode, or "active" if doing rate scaling within a mode.
1686 */
1687 if (!lq_sta->search_better_tbl)
1688 active_tbl = lq_sta->active_tbl;
1689 else
1690 active_tbl = 1 - lq_sta->active_tbl;
1691
1692 tbl = &(lq_sta->lq_info[active_tbl]);
1693 is_green = lq_sta->is_green;
1694
1695 /* current tx rate */
1696 index = sta->last_txrate_idx;
1697
1698 IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1699 tbl->lq_type);
1700
1701 /* rates available for this association, and for modulation mode */
1702 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
1703
1704 IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1705
1706 /* mask with station rate restriction */
1707 if (is_legacy(tbl->lq_type)) {
1708 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1709 /* supp_rates has no CCK bits in A mode */
1710 rate_scale_index_msk = (u16) (rate_mask &
1711 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1712 else
1713 rate_scale_index_msk = (u16) (rate_mask &
1714 lq_sta->supp_rates);
1715
1716 } else
1717 rate_scale_index_msk = rate_mask;
1718
1719 if (!rate_scale_index_msk)
1720 rate_scale_index_msk = rate_mask;
1721
1722 if (!((1 << index) & rate_scale_index_msk)) {
1723 IWL_ERROR("Current Rate is not valid\n");
1724 return;
1725 }
1726
1727 /* Get expected throughput table and history window for current rate */
1728 if (!tbl->expected_tpt) {
1729 IWL_ERROR("tbl->expected_tpt is NULL\n");
1730 return;
1731 }
1732
1733 window = &(tbl->win[index]);
1734
1735 /*
1736 * If there is not enough history to calculate actual average
1737 * throughput, keep analyzing results of more tx frames, without
1738 * changing rate or mode (bypass most of the rest of this function).
1739 * Set up new rate table in uCode only if old rate is not supported
1740 * in current association (use new rate found above).
1741 */
1742 fail_count = window->counter - window->success_counter;
1743 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1744 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
1745 IWL_DEBUG_RATE("LQ: still below TH. succ=%d total=%d "
1746 "for index %d\n",
1747 window->success_counter, window->counter, index);
1748
1749 /* Can't calculate this yet; not enough history */
1750 window->average_tpt = IWL_INVALID_VALUE;
1751
1752 /* Should we stay with this modulation mode,
1753 * or search for a new one? */
1754 rs_stay_in_table(lq_sta);
1755
1756 goto out;
1757
1758 /* Else we have enough samples; calculate estimate of
1759 * actual average throughput */
1760 } else {
1761 /*FIXME:RS remove this else if we don't get this error*/
1762 if (window->average_tpt != ((window->success_ratio *
1763 tbl->expected_tpt[index] + 64) / 128)) {
1764 IWL_ERROR("expected_tpt should have been calculated"
1765 " by now\n");
1766 window->average_tpt = ((window->success_ratio *
1767 tbl->expected_tpt[index] + 64) / 128);
1768 }
1769 }
1770
1771 /* If we are searching for better modulation mode, check success. */
1772 if (lq_sta->search_better_tbl) {
1773
1774 /* If good success, continue using the "search" mode;
1775 * no need to send new link quality command, since we're
1776 * continuing to use the setup that we've been trying. */
1777 if (window->average_tpt > lq_sta->last_tpt) {
1778
1779 IWL_DEBUG_RATE("LQ: SWITCHING TO CURRENT TABLE "
1780 "suc=%d cur-tpt=%d old-tpt=%d\n",
1781 window->success_ratio,
1782 window->average_tpt,
1783 lq_sta->last_tpt);
1784
1785 if (!is_legacy(tbl->lq_type))
1786 lq_sta->enable_counter = 1;
1787
1788 /* Swap tables; "search" becomes "active" */
1789 lq_sta->active_tbl = active_tbl;
1790 current_tpt = window->average_tpt;
1791
1792 /* Else poor success; go back to mode in "active" table */
1793 } else {
1794
1795 IWL_DEBUG_RATE("LQ: GOING BACK TO THE OLD TABLE "
1796 "suc=%d cur-tpt=%d old-tpt=%d\n",
1797 window->success_ratio,
1798 window->average_tpt,
1799 lq_sta->last_tpt);
1800
1801 /* Nullify "search" table */
1802 tbl->lq_type = LQ_NONE;
1803
1804 /* Revert to "active" table */
1805 active_tbl = lq_sta->active_tbl;
1806 tbl = &(lq_sta->lq_info[active_tbl]);
1807
1808 /* Revert to "active" rate and throughput info */
1809 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1810 current_tpt = lq_sta->last_tpt;
1811
1812 /* Need to set up a new rate table in uCode */
1813 update_lq = 1;
1814 }
1815
1816 /* Either way, we've made a decision; modulation mode
1817 * search is done, allow rate adjustment next time. */
1818 lq_sta->search_better_tbl = 0;
1819 done_search = 1; /* Don't switch modes below! */
1820 goto lq_update;
1821 }
1822
1823 /* (Else) not in search of better modulation mode, try for better
1824 * starting rate, while staying in this mode. */
1825 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
1826 tbl->lq_type);
1827 low = high_low & 0xff;
1828 high = (high_low >> 8) & 0xff;
1829
1830 sr = window->success_ratio;
1831
1832 /* Collect measured throughputs for current and adjacent rates */
1833 current_tpt = window->average_tpt;
1834 if (low != IWL_RATE_INVALID)
1835 low_tpt = tbl->win[low].average_tpt;
1836 if (high != IWL_RATE_INVALID)
1837 high_tpt = tbl->win[high].average_tpt;
1838
1839 scale_action = 0;
1840
1841 /* Too many failures, decrease rate */
1842 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
1843 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1844 scale_action = -1;
1845
1846 /* No throughput measured yet for adjacent rates; try increase. */
1847 } else if ((low_tpt == IWL_INVALID_VALUE) &&
1848 (high_tpt == IWL_INVALID_VALUE)) {
1849
1850 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
1851 scale_action = 1;
1852 else if (low != IWL_RATE_INVALID)
1853 scale_action = -1;
1854 }
1855
1856 /* Both adjacent throughputs are measured, but neither one has better
1857 * throughput; we're using the best rate, don't change it! */
1858 else if ((low_tpt != IWL_INVALID_VALUE) &&
1859 (high_tpt != IWL_INVALID_VALUE) &&
1860 (low_tpt < current_tpt) &&
1861 (high_tpt < current_tpt))
1862 scale_action = 0;
1863
1864 /* At least one adjacent rate's throughput is measured,
1865 * and may have better performance. */
1866 else {
1867 /* Higher adjacent rate's throughput is measured */
1868 if (high_tpt != IWL_INVALID_VALUE) {
1869 /* Higher rate has better throughput */
1870 if (high_tpt > current_tpt &&
1871 sr >= IWL_RATE_INCREASE_TH) {
1872 scale_action = 1;
1873 } else {
1874 IWL_DEBUG_RATE
1875 ("decrease rate because of high tpt\n");
1876 scale_action = -1;
1877 }
1878
1879 /* Lower adjacent rate's throughput is measured */
1880 } else if (low_tpt != IWL_INVALID_VALUE) {
1881 /* Lower rate has better throughput */
1882 if (low_tpt > current_tpt) {
1883 IWL_DEBUG_RATE
1884 ("decrease rate because of low tpt\n");
1885 scale_action = -1;
1886 } else if (sr >= IWL_RATE_INCREASE_TH) {
1887 scale_action = 1;
1888 }
1889 }
1890 }
1891
1892 /* Sanity check; asked for decrease, but success rate or throughput
1893 * has been good at old rate. Don't change it. */
1894 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
1895 ((sr > IWL_RATE_HIGH_TH) ||
1896 (current_tpt > (100 * tbl->expected_tpt[low]))))
1897 scale_action = 0;
1898
1899 switch (scale_action) {
1900 case -1:
1901 /* Decrease starting rate, update uCode's rate table */
1902 if (low != IWL_RATE_INVALID) {
1903 update_lq = 1;
1904 index = low;
1905 }
1906 break;
1907 case 1:
1908 /* Increase starting rate, update uCode's rate table */
1909 if (high != IWL_RATE_INVALID) {
1910 update_lq = 1;
1911 index = high;
1912 }
1913
1914 break;
1915 case 0:
1916 /* No change */
1917 default:
1918 break;
1919 }
1920
1921 IWL_DEBUG_RATE("choose rate scale index %d action %d low %d "
1922 "high %d type %d\n",
1923 index, scale_action, low, high, tbl->lq_type);
1924
1925 lq_update:
1926 /* Replace uCode's rate table for the destination station. */
1927 if (update_lq) {
1928 rate = rate_n_flags_from_tbl(tbl, index, is_green);
1929 rs_fill_link_cmd(priv, lq_sta, rate);
1930 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1931 }
1932
1933 /* Should we stay with this modulation mode, or search for a new one? */
1934 rs_stay_in_table(lq_sta);
1935
1936 /*
1937 * Search for new modulation mode if we're:
1938 * 1) Not changing rates right now
1939 * 2) Not just finishing up a search
1940 * 3) Allowing a new search
1941 */
1942 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
1943 /* Save current throughput to compare with "search" throughput*/
1944 lq_sta->last_tpt = current_tpt;
1945
1946 /* Select a new "search" modulation mode to try.
1947 * If one is found, set up the new "search" table. */
1948 if (is_legacy(tbl->lq_type))
1949 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
1950 else if (is_siso(tbl->lq_type))
1951 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
1952 else
1953 rs_move_mimo_to_other(priv, lq_sta, conf, sta, index);
1954
1955 /* If new "search" mode was selected, set up in uCode table */
1956 if (lq_sta->search_better_tbl) {
1957 /* Access the "search" table, clear its history. */
1958 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1959 for (i = 0; i < IWL_RATE_COUNT; i++)
1960 rs_rate_scale_clear_window(&(tbl->win[i]));
1961
1962 /* Use new "search" start rate */
1963 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1964
1965 IWL_DEBUG_RATE("Switch current mcs: %X index: %d\n",
1966 tbl->current_rate, index);
1967 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
1968 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1969 }
1970
1971 /* If the "active" (non-search) mode was legacy,
1972 * and we've tried switching antennas,
1973 * but we haven't been able to try HT modes (not available),
1974 * stay with best antenna legacy modulation for a while
1975 * before next round of mode comparisons. */
1976 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
1977 if (is_legacy(tbl1->lq_type) &&
1978 (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)) &&
1979 (lq_sta->action_counter >= 1)) {
1980 lq_sta->action_counter = 0;
1981 IWL_DEBUG_RATE("LQ: STAY in legacy table\n");
1982 rs_set_stay_in_table(priv, 1, lq_sta);
1983 }
1984
1985 /* If we're in an HT mode, and all 3 mode switch actions
1986 * have been tried and compared, stay in this best modulation
1987 * mode for a while before next round of mode comparisons. */
1988 if (lq_sta->enable_counter &&
1989 (lq_sta->action_counter >= IWL_ACTION_LIMIT)) {
1990 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
1991 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
1992 (tid != MAX_TID_COUNT)) {
1993 IWL_DEBUG_RATE("try to aggregate tid %d\n", tid);
1994 rs_tl_turn_on_agg(priv, tid, lq_sta, sta);
1995 }
1996 lq_sta->action_counter = 0;
1997 rs_set_stay_in_table(priv, 0, lq_sta);
1998 }
1999
2000 /*
2001 * Else, don't search for a new modulation mode.
2002 * Put new timestamp in stay-in-modulation-mode flush timer if:
2003 * 1) Not changing rates right now
2004 * 2) Not just finishing up a search
2005 * 3) flush timer is empty
2006 */
2007 } else {
2008 if ((!update_lq) && (!done_search) && (!lq_sta->flush_timer))
2009 lq_sta->flush_timer = jiffies;
2010 }
2011
2012 out:
2013 tbl->current_rate = rate_n_flags_from_tbl(tbl, index, is_green);
2014 i = index;
2015 sta->last_txrate_idx = i;
2016
2017 /* sta->txrate_idx is an index to A mode rates which start
2018 * at IWL_FIRST_OFDM_RATE
2019 */
2020 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2021 sta->txrate_idx = i - IWL_FIRST_OFDM_RATE;
2022 else
2023 sta->txrate_idx = i;
2024
2025 return;
2026 }
2027
2028
2029 static void rs_initialize_lq(struct iwl_priv *priv,
2030 struct ieee80211_conf *conf,
2031 struct sta_info *sta)
2032 {
2033 struct iwl4965_lq_sta *lq_sta;
2034 struct iwl4965_scale_tbl_info *tbl;
2035 int rate_idx;
2036 int i;
2037 u32 rate;
2038 u8 use_green = rs_use_green(priv, conf);
2039 u8 active_tbl = 0;
2040 u8 valid_tx_ant;
2041
2042 if (!sta || !sta->rate_ctrl_priv)
2043 goto out;
2044
2045 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
2046 i = sta->last_txrate_idx;
2047
2048 if ((lq_sta->lq.sta_id == 0xff) &&
2049 (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
2050 goto out;
2051
2052 valid_tx_ant = priv->hw_params.valid_tx_ant;
2053
2054 if (!lq_sta->search_better_tbl)
2055 active_tbl = lq_sta->active_tbl;
2056 else
2057 active_tbl = 1 - lq_sta->active_tbl;
2058
2059 tbl = &(lq_sta->lq_info[active_tbl]);
2060
2061 if ((i < 0) || (i >= IWL_RATE_COUNT))
2062 i = 0;
2063
2064 /* FIXME:RS: This is also wrong in 4965 */
2065 rate = iwl_rates[i].plcp;
2066 rate |= RATE_MCS_ANT_B_MSK;
2067 rate &= ~RATE_MCS_ANT_A_MSK;
2068
2069 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2070 rate |= RATE_MCS_CCK_MSK;
2071
2072 tbl->ant_type = ANT_B;
2073 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2074 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2075 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2076
2077 rate = rate_n_flags_from_tbl(tbl, rate_idx, use_green);
2078 tbl->current_rate = rate;
2079 rs_set_expected_tpt_table(lq_sta, tbl);
2080 rs_fill_link_cmd(NULL, lq_sta, rate);
2081 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2082 out:
2083 return;
2084 }
2085
2086 static void rs_get_rate(void *priv_rate, struct net_device *dev,
2087 struct ieee80211_supported_band *sband,
2088 struct sk_buff *skb,
2089 struct rate_selection *sel)
2090 {
2091
2092 int i;
2093 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2094 struct ieee80211_conf *conf = &local->hw.conf;
2095 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2096 struct sta_info *sta;
2097 __le16 fc;
2098 struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
2099 struct iwl4965_lq_sta *lq_sta;
2100
2101 IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2102
2103 rcu_read_lock();
2104
2105 sta = sta_info_get(local, hdr->addr1);
2106
2107 /* Send management frames and broadcast/multicast data using lowest
2108 * rate. */
2109 fc = hdr->frame_control;
2110 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1) ||
2111 !sta || !sta->rate_ctrl_priv) {
2112 sel->rate_idx = rate_lowest_index(local, sband, sta);
2113 goto out;
2114 }
2115
2116 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
2117 i = sta->last_txrate_idx;
2118
2119 if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
2120 !lq_sta->ibss_sta_added) {
2121 u8 sta_id = iwl_find_station(priv, hdr->addr1);
2122 DECLARE_MAC_BUF(mac);
2123
2124 if (sta_id == IWL_INVALID_STATION) {
2125 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2126 print_mac(mac, hdr->addr1));
2127 sta_id = iwl_add_station_flags(priv, hdr->addr1,
2128 0, CMD_ASYNC, NULL);
2129 }
2130 if ((sta_id != IWL_INVALID_STATION)) {
2131 lq_sta->lq.sta_id = sta_id;
2132 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2133 lq_sta->ibss_sta_added = 1;
2134 rs_initialize_lq(priv, conf, sta);
2135 }
2136 }
2137
2138 if ((i < 0) || (i > IWL_RATE_COUNT)) {
2139 sel->rate_idx = rate_lowest_index(local, sband, sta);
2140 goto out;
2141 }
2142
2143 if (sband->band == IEEE80211_BAND_5GHZ)
2144 i -= IWL_FIRST_OFDM_RATE;
2145 sel->rate_idx = i;
2146 out:
2147 rcu_read_unlock();
2148 }
2149
2150 static void *rs_alloc_sta(void *priv_rate, gfp_t gfp)
2151 {
2152 struct iwl4965_lq_sta *lq_sta;
2153 struct iwl_priv *priv;
2154 int i, j;
2155
2156 priv = (struct iwl_priv *)priv_rate;
2157 IWL_DEBUG_RATE("create station rate scale window\n");
2158
2159 lq_sta = kzalloc(sizeof(struct iwl4965_lq_sta), gfp);
2160
2161 if (lq_sta == NULL)
2162 return NULL;
2163 lq_sta->lq.sta_id = 0xff;
2164
2165
2166 for (j = 0; j < LQ_SIZE; j++)
2167 for (i = 0; i < IWL_RATE_COUNT; i++)
2168 rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
2169
2170 return lq_sta;
2171 }
2172
2173 static void rs_rate_init(void *priv_rate, void *priv_sta,
2174 struct ieee80211_local *local,
2175 struct sta_info *sta)
2176 {
2177 int i, j;
2178 struct ieee80211_conf *conf = &local->hw.conf;
2179 struct ieee80211_supported_band *sband;
2180 struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
2181 struct iwl4965_lq_sta *lq_sta = priv_sta;
2182
2183 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2184
2185 lq_sta->flush_timer = 0;
2186 lq_sta->supp_rates = sta->supp_rates[sband->band];
2187 sta->txrate_idx = 3;
2188 for (j = 0; j < LQ_SIZE; j++)
2189 for (i = 0; i < IWL_RATE_COUNT; i++)
2190 rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
2191
2192 IWL_DEBUG_RATE("LQ: *** rate scale global init ***\n");
2193 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2194 * the lowest or the highest rate.. Could consider using RSSI from
2195 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2196 * after assoc.. */
2197
2198 lq_sta->ibss_sta_added = 0;
2199 if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
2200 u8 sta_id = iwl_find_station(priv, sta->addr);
2201 DECLARE_MAC_BUF(mac);
2202
2203 /* for IBSS the call are from tasklet */
2204 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2205 print_mac(mac, sta->addr));
2206
2207 if (sta_id == IWL_INVALID_STATION) {
2208 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2209 print_mac(mac, sta->addr));
2210 sta_id = iwl_add_station_flags(priv, sta->addr,
2211 0, CMD_ASYNC, NULL);
2212 }
2213 if ((sta_id != IWL_INVALID_STATION)) {
2214 lq_sta->lq.sta_id = sta_id;
2215 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2216 }
2217 /* FIXME: this is w/a remove it later */
2218 priv->assoc_station_added = 1;
2219 }
2220
2221 /* Find highest tx rate supported by hardware and destination station */
2222 for (i = 0; i < sband->n_bitrates; i++)
2223 if (sta->supp_rates[sband->band] & BIT(i))
2224 sta->txrate_idx = i;
2225
2226 sta->last_txrate_idx = sta->txrate_idx;
2227 /* WTF is with this bogus comment? A doesn't have cck rates */
2228 /* For MODE_IEEE80211A, cck rates are at end of rate table */
2229 if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
2230 sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2231
2232 lq_sta->is_dup = 0;
2233 lq_sta->is_green = rs_use_green(priv, conf);
2234 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2235 lq_sta->active_rate_basic = priv->active_rate_basic;
2236 lq_sta->band = priv->band;
2237 /*
2238 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2239 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2240 */
2241 lq_sta->active_siso_rate = conf->ht_conf.supp_mcs_set[0] << 1;
2242 lq_sta->active_siso_rate |= conf->ht_conf.supp_mcs_set[0] & 0x1;
2243 lq_sta->active_siso_rate &= ~((u16)0x2);
2244 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2245
2246 /* Same here */
2247 lq_sta->active_mimo2_rate = conf->ht_conf.supp_mcs_set[1] << 1;
2248 lq_sta->active_mimo2_rate |= conf->ht_conf.supp_mcs_set[1] & 0x1;
2249 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2250 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2251
2252 lq_sta->active_mimo3_rate = conf->ht_conf.supp_mcs_set[2] << 1;
2253 lq_sta->active_mimo3_rate |= conf->ht_conf.supp_mcs_set[2] & 0x1;
2254 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2255 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2256
2257 IWL_DEBUG_RATE("SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2258 lq_sta->active_siso_rate,
2259 lq_sta->active_mimo2_rate,
2260 lq_sta->active_mimo3_rate);
2261
2262 /* These values will be overriden later */
2263 lq_sta->lq.general_params.single_stream_ant_msk = ANT_A;
2264 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2265
2266 /* as default allow aggregation for all tids */
2267 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2268 #ifdef CONFIG_MAC80211_DEBUGFS
2269 lq_sta->drv = priv;
2270 #endif
2271
2272 rs_initialize_lq(priv, conf, sta);
2273 }
2274
2275 static void rs_fill_link_cmd(const struct iwl_priv *priv,
2276 struct iwl4965_lq_sta *lq_sta,
2277 u32 new_rate)
2278 {
2279 struct iwl4965_scale_tbl_info tbl_type;
2280 int index = 0;
2281 int rate_idx;
2282 int repeat_rate = 0;
2283 u8 ant_toggle_cnt = 0;
2284 u8 use_ht_possible = 1;
2285 u8 valid_tx_ant = 0;
2286 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2287
2288 /* Override starting rate (index 0) if needed for debug purposes */
2289 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2290
2291 /* Interpret new_rate (rate_n_flags) */
2292 memset(&tbl_type, 0, sizeof(tbl_type));
2293 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2294 &tbl_type, &rate_idx);
2295
2296 /* How many times should we repeat the initial rate? */
2297 if (is_legacy(tbl_type.lq_type)) {
2298 ant_toggle_cnt = 1;
2299 repeat_rate = IWL_NUMBER_TRY;
2300 } else {
2301 repeat_rate = IWL_HT_NUMBER_TRY;
2302 }
2303
2304 lq_cmd->general_params.mimo_delimiter =
2305 is_mimo(tbl_type.lq_type) ? 1 : 0;
2306
2307 /* Fill 1st table entry (index 0) */
2308 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2309
2310 if (num_of_ant(tbl_type.ant_type) == 1) {
2311 lq_cmd->general_params.single_stream_ant_msk =
2312 tbl_type.ant_type;
2313 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2314 lq_cmd->general_params.dual_stream_ant_msk =
2315 tbl_type.ant_type;
2316 } /* otherwise we don't modify the existing value */
2317
2318 index++;
2319 repeat_rate--;
2320
2321 if (priv)
2322 valid_tx_ant = priv->hw_params.valid_tx_ant;
2323
2324 /* Fill rest of rate table */
2325 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2326 /* Repeat initial/next rate.
2327 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2328 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2329 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2330 if (is_legacy(tbl_type.lq_type)) {
2331 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2332 ant_toggle_cnt++;
2333 else if (priv &&
2334 rs_toggle_antenna(valid_tx_ant,
2335 &new_rate, &tbl_type))
2336 ant_toggle_cnt = 1;
2337 }
2338
2339 /* Override next rate if needed for debug purposes */
2340 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2341
2342 /* Fill next table entry */
2343 lq_cmd->rs_table[index].rate_n_flags =
2344 cpu_to_le32(new_rate);
2345 repeat_rate--;
2346 index++;
2347 }
2348
2349 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2350 &rate_idx);
2351
2352 /* Indicate to uCode which entries might be MIMO.
2353 * If initial rate was MIMO, this will finally end up
2354 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2355 if (is_mimo(tbl_type.lq_type))
2356 lq_cmd->general_params.mimo_delimiter = index;
2357
2358 /* Get next rate */
2359 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2360 use_ht_possible);
2361
2362 /* How many times should we repeat the next rate? */
2363 if (is_legacy(tbl_type.lq_type)) {
2364 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2365 ant_toggle_cnt++;
2366 else if (priv &&
2367 rs_toggle_antenna(valid_tx_ant,
2368 &new_rate, &tbl_type))
2369 ant_toggle_cnt = 1;
2370
2371 repeat_rate = IWL_NUMBER_TRY;
2372 } else {
2373 repeat_rate = IWL_HT_NUMBER_TRY;
2374 }
2375
2376 /* Don't allow HT rates after next pass.
2377 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2378 use_ht_possible = 0;
2379
2380 /* Override next rate if needed for debug purposes */
2381 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2382
2383 /* Fill next table entry */
2384 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2385
2386 index++;
2387 repeat_rate--;
2388 }
2389
2390 lq_cmd->agg_params.agg_frame_cnt_limit = 64;
2391 lq_cmd->agg_params.agg_dis_start_th = 3;
2392 lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
2393 }
2394
2395 static void *rs_alloc(struct ieee80211_local *local)
2396 {
2397 return local->hw.priv;
2398 }
2399 /* rate scale requires free function to be implemented */
2400 static void rs_free(void *priv_rate)
2401 {
2402 return;
2403 }
2404
2405 static void rs_clear(void *priv_rate)
2406 {
2407 struct iwl_priv *priv = (struct iwl_priv *) priv_rate;
2408
2409 IWL_DEBUG_RATE("enter\n");
2410
2411 /* TODO - add rate scale state reset */
2412
2413 IWL_DEBUG_RATE("leave\n");
2414 }
2415
2416 static void rs_free_sta(void *priv_rate, void *priv_sta)
2417 {
2418 struct iwl4965_lq_sta *lq_sta = priv_sta;
2419 struct iwl_priv *priv;
2420
2421 priv = (struct iwl_priv *)priv_rate;
2422 IWL_DEBUG_RATE("enter\n");
2423 kfree(lq_sta);
2424 IWL_DEBUG_RATE("leave\n");
2425 }
2426
2427
2428 #ifdef CONFIG_MAC80211_DEBUGFS
2429 static int open_file_generic(struct inode *inode, struct file *file)
2430 {
2431 file->private_data = inode->i_private;
2432 return 0;
2433 }
2434 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
2435 u32 *rate_n_flags, int index)
2436 {
2437 struct iwl_priv *priv;
2438
2439 priv = lq_sta->drv;
2440 if (lq_sta->dbg_fixed_rate) {
2441 if (index < 12) {
2442 *rate_n_flags = lq_sta->dbg_fixed_rate;
2443 } else {
2444 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2445 *rate_n_flags = 0x800D;
2446 else
2447 *rate_n_flags = 0x820A;
2448 }
2449 IWL_DEBUG_RATE("Fixed rate ON\n");
2450 } else {
2451 IWL_DEBUG_RATE("Fixed rate OFF\n");
2452 }
2453 }
2454
2455 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2456 const char __user *user_buf, size_t count, loff_t *ppos)
2457 {
2458 struct iwl4965_lq_sta *lq_sta = file->private_data;
2459 struct iwl_priv *priv;
2460 char buf[64];
2461 int buf_size;
2462 u32 parsed_rate;
2463
2464 priv = lq_sta->drv;
2465 memset(buf, 0, sizeof(buf));
2466 buf_size = min(count, sizeof(buf) - 1);
2467 if (copy_from_user(buf, user_buf, buf_size))
2468 return -EFAULT;
2469
2470 if (sscanf(buf, "%x", &parsed_rate) == 1)
2471 lq_sta->dbg_fixed_rate = parsed_rate;
2472 else
2473 lq_sta->dbg_fixed_rate = 0;
2474
2475 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2476 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2477 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2478 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2479
2480 IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2481 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2482
2483 if (lq_sta->dbg_fixed_rate) {
2484 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2485 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2486 }
2487
2488 return count;
2489 }
2490
2491 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2492 char __user *user_buf, size_t count, loff_t *ppos)
2493 {
2494 char buff[1024];
2495 int desc = 0;
2496 int i = 0;
2497
2498 struct iwl4965_lq_sta *lq_sta = file->private_data;
2499
2500 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2501 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2502 lq_sta->total_failed, lq_sta->total_success,
2503 lq_sta->active_legacy_rate);
2504 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2505 lq_sta->dbg_fixed_rate);
2506 desc += sprintf(buff+desc, "general:"
2507 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2508 lq_sta->lq.general_params.flags,
2509 lq_sta->lq.general_params.mimo_delimiter,
2510 lq_sta->lq.general_params.single_stream_ant_msk,
2511 lq_sta->lq.general_params.dual_stream_ant_msk);
2512
2513 desc += sprintf(buff+desc, "agg:"
2514 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2515 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2516 lq_sta->lq.agg_params.agg_dis_start_th,
2517 lq_sta->lq.agg_params.agg_frame_cnt_limit);
2518
2519 desc += sprintf(buff+desc,
2520 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2521 lq_sta->lq.general_params.start_rate_index[0],
2522 lq_sta->lq.general_params.start_rate_index[1],
2523 lq_sta->lq.general_params.start_rate_index[2],
2524 lq_sta->lq.general_params.start_rate_index[3]);
2525
2526
2527 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2528 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
2529 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2530
2531 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2532 }
2533
2534 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2535 .write = rs_sta_dbgfs_scale_table_write,
2536 .read = rs_sta_dbgfs_scale_table_read,
2537 .open = open_file_generic,
2538 };
2539 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2540 char __user *user_buf, size_t count, loff_t *ppos)
2541 {
2542 char buff[1024];
2543 int desc = 0;
2544 int i, j;
2545
2546 struct iwl4965_lq_sta *lq_sta = file->private_data;
2547 for (i = 0; i < LQ_SIZE; i++) {
2548 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2549 "rate=0x%X\n",
2550 lq_sta->active_tbl == i?"*":"x",
2551 lq_sta->lq_info[i].lq_type,
2552 lq_sta->lq_info[i].is_SGI,
2553 lq_sta->lq_info[i].is_fat,
2554 lq_sta->lq_info[i].is_dup,
2555 lq_sta->lq_info[i].current_rate);
2556 for (j = 0; j < IWL_RATE_COUNT; j++) {
2557 desc += sprintf(buff+desc,
2558 "counter=%d success=%d %%=%d\n",
2559 lq_sta->lq_info[i].win[j].counter,
2560 lq_sta->lq_info[i].win[j].success_counter,
2561 lq_sta->lq_info[i].win[j].success_ratio);
2562 }
2563 }
2564 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2565 }
2566
2567 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2568 .read = rs_sta_dbgfs_stats_table_read,
2569 .open = open_file_generic,
2570 };
2571
2572 static void rs_add_debugfs(void *priv, void *priv_sta,
2573 struct dentry *dir)
2574 {
2575 struct iwl4965_lq_sta *lq_sta = priv_sta;
2576 lq_sta->rs_sta_dbgfs_scale_table_file =
2577 debugfs_create_file("rate_scale_table", 0600, dir,
2578 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2579 lq_sta->rs_sta_dbgfs_stats_table_file =
2580 debugfs_create_file("rate_stats_table", 0600, dir,
2581 lq_sta, &rs_sta_dbgfs_stats_table_ops);
2582 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2583 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
2584 &lq_sta->tx_agg_tid_en);
2585
2586 }
2587
2588 static void rs_remove_debugfs(void *priv, void *priv_sta)
2589 {
2590 struct iwl4965_lq_sta *lq_sta = priv_sta;
2591 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2592 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2593 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2594 }
2595 #endif
2596
2597 static struct rate_control_ops rs_ops = {
2598 .module = NULL,
2599 .name = RS_NAME,
2600 .tx_status = rs_tx_status,
2601 .get_rate = rs_get_rate,
2602 .rate_init = rs_rate_init,
2603 .clear = rs_clear,
2604 .alloc = rs_alloc,
2605 .free = rs_free,
2606 .alloc_sta = rs_alloc_sta,
2607 .free_sta = rs_free_sta,
2608 #ifdef CONFIG_MAC80211_DEBUGFS
2609 .add_sta_debugfs = rs_add_debugfs,
2610 .remove_sta_debugfs = rs_remove_debugfs,
2611 #endif
2612 };
2613
2614 int iwl4965_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id)
2615 {
2616 struct ieee80211_local *local = hw_to_local(hw);
2617 struct iwl_priv *priv = hw->priv;
2618 struct iwl4965_lq_sta *lq_sta;
2619 struct sta_info *sta;
2620 int cnt = 0, i;
2621 u32 samples = 0, success = 0, good = 0;
2622 unsigned long now = jiffies;
2623 u32 max_time = 0;
2624 u8 lq_type, antenna;
2625
2626 rcu_read_lock();
2627
2628 sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
2629 if (!sta || !sta->rate_ctrl_priv) {
2630 if (sta)
2631 IWL_DEBUG_RATE("leave - no private rate data!\n");
2632 else
2633 IWL_DEBUG_RATE("leave - no station!\n");
2634 rcu_read_unlock();
2635 return sprintf(buf, "station %d not found\n", sta_id);
2636 }
2637
2638 lq_sta = (void *)sta->rate_ctrl_priv;
2639
2640 lq_type = lq_sta->lq_info[lq_sta->active_tbl].lq_type;
2641 antenna = lq_sta->lq_info[lq_sta->active_tbl].ant_type;
2642
2643 if (is_legacy(lq_type))
2644 i = IWL_RATE_54M_INDEX;
2645 else
2646 i = IWL_RATE_60M_INDEX;
2647 while (1) {
2648 u64 mask;
2649 int j;
2650 int active = lq_sta->active_tbl;
2651
2652 cnt +=
2653 sprintf(&buf[cnt], " %2dMbs: ", iwl_rates[i].ieee / 2);
2654
2655 mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1));
2656 for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1)
2657 buf[cnt++] =
2658 (lq_sta->lq_info[active].win[i].data & mask)
2659 ? '1' : '0';
2660
2661 samples += lq_sta->lq_info[active].win[i].counter;
2662 good += lq_sta->lq_info[active].win[i].success_counter;
2663 success += lq_sta->lq_info[active].win[i].success_counter *
2664 iwl_rates[i].ieee;
2665
2666 if (lq_sta->lq_info[active].win[i].stamp) {
2667 int delta =
2668 jiffies_to_msecs(now -
2669 lq_sta->lq_info[active].win[i].stamp);
2670
2671 if (delta > max_time)
2672 max_time = delta;
2673
2674 cnt += sprintf(&buf[cnt], "%5dms\n", delta);
2675 } else
2676 buf[cnt++] = '\n';
2677
2678 j = iwl4965_get_prev_ieee_rate(i);
2679 if (j == i)
2680 break;
2681 i = j;
2682 }
2683
2684 /*
2685 * Display the average rate of all samples taken.
2686 * NOTE: We multiply # of samples by 2 since the IEEE measurement
2687 * added from iwl_rates is actually 2X the rate.
2688 */
2689 if (samples)
2690 cnt += sprintf(&buf[cnt],
2691 "\nAverage rate is %3d.%02dMbs over last %4dms\n"
2692 "%3d%% success (%d good packets over %d tries)\n",
2693 success / (2 * samples), (success * 5 / samples) % 10,
2694 max_time, good * 100 / samples, good, samples);
2695 else
2696 cnt += sprintf(&buf[cnt], "\nAverage rate: 0Mbs\n");
2697
2698 cnt += sprintf(&buf[cnt], "\nrate scale type %d antenna %d "
2699 "active_search %d rate index %d\n", lq_type, antenna,
2700 lq_sta->search_better_tbl, sta->last_txrate_idx);
2701
2702 rcu_read_unlock();
2703 return cnt;
2704 }
2705
2706 int iwl4965_rate_control_register(void)
2707 {
2708 return ieee80211_rate_control_register(&rs_ops);
2709 }
2710
2711 void iwl4965_rate_control_unregister(void)
2712 {
2713 ieee80211_rate_control_unregister(&rs_ops);
2714 }
2715
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree