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 * Intel Linux Wireless <ilw@linux.intel.com>
23 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
24 *
25 *****************************************************************************/
26 #include <linux/kernel.h>
27 #include <linux/init.h>
28 #include <linux/skbuff.h>
29 #include <linux/wireless.h>
30 #include <net/mac80211.h>
31
32 #include <linux/netdevice.h>
33 #include <linux/etherdevice.h>
34 #include <linux/delay.h>
35
36 #include <linux/workqueue.h>
37
38 #include "iwl-dev.h"
39 #include "iwl-sta.h"
40 #include "iwl-core.h"
41
42 #define RS_NAME "iwl-agn-rs"
43
44 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
45 #define IWL_NUMBER_TRY 1
46 #define IWL_HT_NUMBER_TRY 3
47
48 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
49 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
50 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
51
52 /* max time to accum history 2 seconds */
53 #define IWL_RATE_SCALE_FLUSH_INTVL (2*HZ)
54
55 static u8 rs_ht_to_legacy[] = {
56 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
57 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
58 IWL_RATE_6M_INDEX,
59 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
60 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
61 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
62 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
63 };
64
65 static const u8 ant_toggle_lookup[] = {
66 /*ANT_NONE -> */ ANT_NONE,
67 /*ANT_A -> */ ANT_B,
68 /*ANT_B -> */ ANT_C,
69 /*ANT_AB -> */ ANT_BC,
70 /*ANT_C -> */ ANT_A,
71 /*ANT_AC -> */ ANT_AB,
72 /*ANT_BC -> */ ANT_AC,
73 /*ANT_ABC -> */ ANT_ABC,
74 };
75
76 /**
77 * struct iwl_rate_scale_data -- tx success history for one rate
78 */
79 struct iwl_rate_scale_data {
80 u64 data; /* bitmap of successful frames */
81 s32 success_counter; /* number of frames successful */
82 s32 success_ratio; /* per-cent * 128 */
83 s32 counter; /* number of frames attempted */
84 s32 average_tpt; /* success ratio * expected throughput */
85 unsigned long stamp;
86 };
87
88 /**
89 * struct iwl_scale_tbl_info -- tx params and success history for all rates
90 *
91 * There are two of these in struct iwl_lq_sta,
92 * one for "active", and one for "search".
93 */
94 struct iwl_scale_tbl_info {
95 enum iwl_table_type lq_type;
96 u8 ant_type;
97 u8 is_SGI; /* 1 = short guard interval */
98 u8 is_fat; /* 1 = 40 MHz channel width */
99 u8 is_dup; /* 1 = duplicated data streams */
100 u8 action; /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
101 s32 *expected_tpt; /* throughput metrics; expected_tpt_G, etc. */
102 u32 current_rate; /* rate_n_flags, uCode API format */
103 struct iwl_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
104 };
105
106 struct iwl_traffic_load {
107 unsigned long time_stamp; /* age of the oldest statistics */
108 u32 packet_count[TID_QUEUE_MAX_SIZE]; /* packet count in this time
109 * slice */
110 u32 total; /* total num of packets during the
111 * last TID_MAX_TIME_DIFF */
112 u8 queue_count; /* number of queues that has
113 * been used since the last cleanup */
114 u8 head; /* start of the circular buffer */
115 };
116
117 /**
118 * struct iwl_lq_sta -- driver's rate scaling private structure
119 *
120 * Pointer to this gets passed back and forth between driver and mac80211.
121 */
122 struct iwl_lq_sta {
123 u8 active_tbl; /* index of active table, range 0-1 */
124 u8 enable_counter; /* indicates HT mode */
125 u8 stay_in_tbl; /* 1: disallow, 0: allow search for new mode */
126 u8 search_better_tbl; /* 1: currently trying alternate mode */
127 s32 last_tpt;
128
129 /* The following determine when to search for a new mode */
130 u32 table_count_limit;
131 u32 max_failure_limit; /* # failed frames before new search */
132 u32 max_success_limit; /* # successful frames before new search */
133 u32 table_count;
134 u32 total_failed; /* total failed frames, any/all rates */
135 u32 total_success; /* total successful frames, any/all rates */
136 u32 flush_timer; /* time staying in mode before new search */
137
138 u8 action_counter; /* # mode-switch actions tried */
139 u8 is_green;
140 u8 is_dup;
141 enum ieee80211_band band;
142 u8 ibss_sta_added;
143
144 /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
145 u32 supp_rates;
146 u16 active_legacy_rate;
147 u16 active_siso_rate;
148 u16 active_mimo2_rate;
149 u16 active_mimo3_rate;
150 u16 active_rate_basic;
151
152 struct iwl_link_quality_cmd lq;
153 struct iwl_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
154 struct iwl_traffic_load load[TID_MAX_LOAD_COUNT];
155 u8 tx_agg_tid_en;
156 #ifdef CONFIG_MAC80211_DEBUGFS
157 struct dentry *rs_sta_dbgfs_scale_table_file;
158 struct dentry *rs_sta_dbgfs_stats_table_file;
159 struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
160 u32 dbg_fixed_rate;
161 #endif
162 struct iwl_priv *drv;
163
164 /* used to be in sta_info */
165 int last_txrate_idx;
166 };
167
168 static void rs_rate_scale_perform(struct iwl_priv *priv,
169 struct ieee80211_hdr *hdr,
170 struct ieee80211_sta *sta,
171 struct iwl_lq_sta *lq_sta);
172 static void rs_fill_link_cmd(const struct iwl_priv *priv,
173 struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
174
175
176 #ifdef CONFIG_MAC80211_DEBUGFS
177 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
178 u32 *rate_n_flags, int index);
179 #else
rs_dbgfs_set_mcs(struct iwl_lq_sta * lq_sta,u32 * rate_n_flags,int index)180 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
181 u32 *rate_n_flags, int index)
182 {}
183 #endif
184
185 /*
186 * Expected throughput metrics for following rates:
187 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
188 * "G" is the only table that supports CCK (the first 4 rates).
189 */
190 /*FIXME:RS:need to separate tables for MIMO2/MIMO3*/
191 static s32 expected_tpt_A[IWL_RATE_COUNT] = {
192 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
193 };
194
195 static s32 expected_tpt_G[IWL_RATE_COUNT] = {
196 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
197 };
198
199 static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
200 0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
201 };
202
203 static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
204 0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
205 };
206
207 static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
208 0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
209 };
210
211 static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
212 0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
213 };
214
215 static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
216 0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
217 };
218
219 static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
220 0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
221 };
222
223 static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
224 0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
225 };
226
227 static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
228 0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
229 };
230
rs_extract_rate(u32 rate_n_flags)231 static inline u8 rs_extract_rate(u32 rate_n_flags)
232 {
233 return (u8)(rate_n_flags & 0xFF);
234 }
235
rs_rate_scale_clear_window(struct iwl_rate_scale_data * window)236 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
237 {
238 window->data = 0;
239 window->success_counter = 0;
240 window->success_ratio = IWL_INVALID_VALUE;
241 window->counter = 0;
242 window->average_tpt = IWL_INVALID_VALUE;
243 window->stamp = 0;
244 }
245
rs_is_valid_ant(u8 valid_antenna,u8 ant_type)246 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
247 {
248 return (ant_type & valid_antenna) == ant_type;
249 }
250
251 /*
252 * removes the old data from the statistics. All data that is older than
253 * TID_MAX_TIME_DIFF, will be deleted.
254 */
rs_tl_rm_old_stats(struct iwl_traffic_load * tl,u32 curr_time)255 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
256 {
257 /* The oldest age we want to keep */
258 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
259
260 while (tl->queue_count &&
261 (tl->time_stamp < oldest_time)) {
262 tl->total -= tl->packet_count[tl->head];
263 tl->packet_count[tl->head] = 0;
264 tl->time_stamp += TID_QUEUE_CELL_SPACING;
265 tl->queue_count--;
266 tl->head++;
267 if (tl->head >= TID_QUEUE_MAX_SIZE)
268 tl->head = 0;
269 }
270 }
271
272 /*
273 * increment traffic load value for tid and also remove
274 * any old values if passed the certain time period
275 */
rs_tl_add_packet(struct iwl_lq_sta * lq_data,struct ieee80211_hdr * hdr)276 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
277 struct ieee80211_hdr *hdr)
278 {
279 u32 curr_time = jiffies_to_msecs(jiffies);
280 u32 time_diff;
281 s32 index;
282 struct iwl_traffic_load *tl = NULL;
283 u8 tid;
284
285 if (ieee80211_is_data_qos(hdr->frame_control)) {
286 u8 *qc = ieee80211_get_qos_ctl(hdr);
287 tid = qc[0] & 0xf;
288 } else
289 return MAX_TID_COUNT;
290
291 tl = &lq_data->load[tid];
292
293 curr_time -= curr_time % TID_ROUND_VALUE;
294
295 /* Happens only for the first packet. Initialize the data */
296 if (!(tl->queue_count)) {
297 tl->total = 1;
298 tl->time_stamp = curr_time;
299 tl->queue_count = 1;
300 tl->head = 0;
301 tl->packet_count[0] = 1;
302 return MAX_TID_COUNT;
303 }
304
305 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
306 index = time_diff / TID_QUEUE_CELL_SPACING;
307
308 /* The history is too long: remove data that is older than */
309 /* TID_MAX_TIME_DIFF */
310 if (index >= TID_QUEUE_MAX_SIZE)
311 rs_tl_rm_old_stats(tl, curr_time);
312
313 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
314 tl->packet_count[index] = tl->packet_count[index] + 1;
315 tl->total = tl->total + 1;
316
317 if ((index + 1) > tl->queue_count)
318 tl->queue_count = index + 1;
319
320 return tid;
321 }
322
323 /*
324 get the traffic load value for tid
325 */
rs_tl_get_load(struct iwl_lq_sta * lq_data,u8 tid)326 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
327 {
328 u32 curr_time = jiffies_to_msecs(jiffies);
329 u32 time_diff;
330 s32 index;
331 struct iwl_traffic_load *tl = NULL;
332
333 if (tid >= TID_MAX_LOAD_COUNT)
334 return 0;
335
336 tl = &(lq_data->load[tid]);
337
338 curr_time -= curr_time % TID_ROUND_VALUE;
339
340 if (!(tl->queue_count))
341 return 0;
342
343 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
344 index = time_diff / TID_QUEUE_CELL_SPACING;
345
346 /* The history is too long: remove data that is older than */
347 /* TID_MAX_TIME_DIFF */
348 if (index >= TID_QUEUE_MAX_SIZE)
349 rs_tl_rm_old_stats(tl, curr_time);
350
351 return tl->total;
352 }
353
rs_tl_turn_on_agg_for_tid(struct iwl_priv * priv,struct iwl_lq_sta * lq_data,u8 tid,struct ieee80211_sta * sta)354 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
355 struct iwl_lq_sta *lq_data, u8 tid,
356 struct ieee80211_sta *sta)
357 {
358 if (rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
359 IWL_DEBUG_HT("Starting Tx agg: STA: %pM tid: %d\n",
360 sta->addr, tid);
361 ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
362 }
363 }
364
rs_tl_turn_on_agg(struct iwl_priv * priv,u8 tid,struct iwl_lq_sta * lq_data,struct ieee80211_sta * sta)365 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
366 struct iwl_lq_sta *lq_data,
367 struct ieee80211_sta *sta)
368 {
369 if ((tid < TID_MAX_LOAD_COUNT))
370 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
371 else if (tid == IWL_AGG_ALL_TID)
372 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
373 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
374 }
375
get_num_of_ant_from_rate(u32 rate_n_flags)376 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
377 {
378 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
379 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
380 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
381 }
382
383 /**
384 * rs_collect_tx_data - Update the success/failure sliding window
385 *
386 * We keep a sliding window of the last 62 packets transmitted
387 * at this rate. window->data contains the bitmask of successful
388 * packets.
389 */
rs_collect_tx_data(struct iwl_rate_scale_data * windows,int scale_index,s32 tpt,int retries,int successes)390 static int rs_collect_tx_data(struct iwl_rate_scale_data *windows,
391 int scale_index, s32 tpt, int retries,
392 int successes)
393 {
394 struct iwl_rate_scale_data *window = NULL;
395 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
396 s32 fail_count;
397
398 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
399 return -EINVAL;
400
401 /* Select data for current tx bit rate */
402 window = &(windows[scale_index]);
403
404 /*
405 * Keep track of only the latest 62 tx frame attempts in this rate's
406 * history window; anything older isn't really relevant any more.
407 * If we have filled up the sliding window, drop the oldest attempt;
408 * if the oldest attempt (highest bit in bitmap) shows "success",
409 * subtract "1" from the success counter (this is the main reason
410 * we keep these bitmaps!).
411 */
412 while (retries > 0) {
413 if (window->counter >= IWL_RATE_MAX_WINDOW) {
414
415 /* remove earliest */
416 window->counter = IWL_RATE_MAX_WINDOW - 1;
417
418 if (window->data & mask) {
419 window->data &= ~mask;
420 window->success_counter--;
421 }
422 }
423
424 /* Increment frames-attempted counter */
425 window->counter++;
426
427 /* Shift bitmap by one frame (throw away oldest history),
428 * OR in "1", and increment "success" if this
429 * frame was successful. */
430 window->data <<= 1;
431 if (successes > 0) {
432 window->success_counter++;
433 window->data |= 0x1;
434 successes--;
435 }
436
437 retries--;
438 }
439
440 /* Calculate current success ratio, avoid divide-by-0! */
441 if (window->counter > 0)
442 window->success_ratio = 128 * (100 * window->success_counter)
443 / window->counter;
444 else
445 window->success_ratio = IWL_INVALID_VALUE;
446
447 fail_count = window->counter - window->success_counter;
448
449 /* Calculate average throughput, if we have enough history. */
450 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
451 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
452 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
453 else
454 window->average_tpt = IWL_INVALID_VALUE;
455
456 /* Tag this window as having been updated */
457 window->stamp = jiffies;
458
459 return 0;
460 }
461
462 /*
463 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
464 */
465 /* FIXME:RS:remove this function and put the flags statically in the table */
rate_n_flags_from_tbl(struct iwl_scale_tbl_info * tbl,int index,u8 use_green)466 static u32 rate_n_flags_from_tbl(struct iwl_scale_tbl_info *tbl,
467 int index, u8 use_green)
468 {
469 u32 rate_n_flags = 0;
470
471 if (is_legacy(tbl->lq_type)) {
472 rate_n_flags = iwl_rates[index].plcp;
473 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
474 rate_n_flags |= RATE_MCS_CCK_MSK;
475
476 } else if (is_Ht(tbl->lq_type)) {
477 if (index > IWL_LAST_OFDM_RATE) {
478 IWL_ERROR("invalid HT rate index %d\n", index);
479 index = IWL_LAST_OFDM_RATE;
480 }
481 rate_n_flags = RATE_MCS_HT_MSK;
482
483 if (is_siso(tbl->lq_type))
484 rate_n_flags |= iwl_rates[index].plcp_siso;
485 else if (is_mimo2(tbl->lq_type))
486 rate_n_flags |= iwl_rates[index].plcp_mimo2;
487 else
488 rate_n_flags |= iwl_rates[index].plcp_mimo3;
489 } else {
490 IWL_ERROR("Invalid tbl->lq_type %d\n", tbl->lq_type);
491 }
492
493 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
494 RATE_MCS_ANT_ABC_MSK);
495
496 if (is_Ht(tbl->lq_type)) {
497 if (tbl->is_fat) {
498 if (tbl->is_dup)
499 rate_n_flags |= RATE_MCS_DUP_MSK;
500 else
501 rate_n_flags |= RATE_MCS_FAT_MSK;
502 }
503 if (tbl->is_SGI)
504 rate_n_flags |= RATE_MCS_SGI_MSK;
505
506 if (use_green) {
507 rate_n_flags |= RATE_MCS_GF_MSK;
508 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
509 rate_n_flags &= ~RATE_MCS_SGI_MSK;
510 IWL_ERROR("GF was set with SGI:SISO\n");
511 }
512 }
513 }
514 return rate_n_flags;
515 }
516
517 /*
518 * Interpret uCode API's rate_n_flags format,
519 * fill "search" or "active" tx mode table.
520 */
rs_get_tbl_info_from_mcs(const u32 rate_n_flags,enum ieee80211_band band,struct iwl_scale_tbl_info * tbl,int * rate_idx)521 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
522 enum ieee80211_band band,
523 struct iwl_scale_tbl_info *tbl,
524 int *rate_idx)
525 {
526 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
527 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
528 u8 mcs;
529
530 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
531
532 if (*rate_idx == IWL_RATE_INVALID) {
533 *rate_idx = -1;
534 return -EINVAL;
535 }
536 tbl->is_SGI = 0; /* default legacy setup */
537 tbl->is_fat = 0;
538 tbl->is_dup = 0;
539 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
540 tbl->lq_type = LQ_NONE;
541
542 /* legacy rate format */
543 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
544 if (num_of_ant == 1) {
545 if (band == IEEE80211_BAND_5GHZ)
546 tbl->lq_type = LQ_A;
547 else
548 tbl->lq_type = LQ_G;
549 }
550 /* HT rate format */
551 } else {
552 if (rate_n_flags & RATE_MCS_SGI_MSK)
553 tbl->is_SGI = 1;
554
555 if ((rate_n_flags & RATE_MCS_FAT_MSK) ||
556 (rate_n_flags & RATE_MCS_DUP_MSK))
557 tbl->is_fat = 1;
558
559 if (rate_n_flags & RATE_MCS_DUP_MSK)
560 tbl->is_dup = 1;
561
562 mcs = rs_extract_rate(rate_n_flags);
563
564 /* SISO */
565 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
566 if (num_of_ant == 1)
567 tbl->lq_type = LQ_SISO; /*else NONE*/
568 /* MIMO2 */
569 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
570 if (num_of_ant == 2)
571 tbl->lq_type = LQ_MIMO2;
572 /* MIMO3 */
573 } else {
574 if (num_of_ant == 3)
575 tbl->lq_type = LQ_MIMO3;
576 }
577 }
578 return 0;
579 }
580
581 /* switch to another antenna/antennas and return 1 */
582 /* if no other valid antenna found, return 0 */
rs_toggle_antenna(u32 valid_ant,u32 * rate_n_flags,struct iwl_scale_tbl_info * tbl)583 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
584 struct iwl_scale_tbl_info *tbl)
585 {
586 u8 new_ant_type;
587
588 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
589 return 0;
590
591 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
592 return 0;
593
594 new_ant_type = ant_toggle_lookup[tbl->ant_type];
595
596 while ((new_ant_type != tbl->ant_type) &&
597 !rs_is_valid_ant(valid_ant, new_ant_type))
598 new_ant_type = ant_toggle_lookup[new_ant_type];
599
600 if (new_ant_type == tbl->ant_type)
601 return 0;
602
603 tbl->ant_type = new_ant_type;
604 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
605 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
606 return 1;
607 }
608
609 /* FIXME:RS: in 4965 we don't use greenfield at all */
610 /* FIXME:RS: don't use greenfield for now in TX */
611 #if 0
612 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
613 {
614 return (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) &&
615 priv->current_ht_config.is_green_field &&
616 !priv->current_ht_config.non_GF_STA_present;
617 }
618 #endif
rs_use_green(struct iwl_priv * priv,struct ieee80211_conf * conf)619 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
620 {
621 return 0;
622 }
623
624 /**
625 * rs_get_supported_rates - get the available rates
626 *
627 * if management frame or broadcast frame only return
628 * basic available rates.
629 *
630 */
rs_get_supported_rates(struct iwl_lq_sta * lq_sta,struct ieee80211_hdr * hdr,enum iwl_table_type rate_type)631 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
632 struct ieee80211_hdr *hdr,
633 enum iwl_table_type rate_type)
634 {
635 if (hdr && is_multicast_ether_addr(hdr->addr1) &&
636 lq_sta->active_rate_basic)
637 return lq_sta->active_rate_basic;
638
639 if (is_legacy(rate_type)) {
640 return lq_sta->active_legacy_rate;
641 } else {
642 if (is_siso(rate_type))
643 return lq_sta->active_siso_rate;
644 else if (is_mimo2(rate_type))
645 return lq_sta->active_mimo2_rate;
646 else
647 return lq_sta->active_mimo3_rate;
648 }
649 }
650
rs_get_adjacent_rate(struct iwl_priv * priv,u8 index,u16 rate_mask,int rate_type)651 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
652 int rate_type)
653 {
654 u8 high = IWL_RATE_INVALID;
655 u8 low = IWL_RATE_INVALID;
656
657 /* 802.11A or ht walks to the next literal adjacent rate in
658 * the rate table */
659 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
660 int i;
661 u32 mask;
662
663 /* Find the previous rate that is in the rate mask */
664 i = index - 1;
665 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
666 if (rate_mask & mask) {
667 low = i;
668 break;
669 }
670 }
671
672 /* Find the next rate that is in the rate mask */
673 i = index + 1;
674 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
675 if (rate_mask & mask) {
676 high = i;
677 break;
678 }
679 }
680
681 return (high << 8) | low;
682 }
683
684 low = index;
685 while (low != IWL_RATE_INVALID) {
686 low = iwl_rates[low].prev_rs;
687 if (low == IWL_RATE_INVALID)
688 break;
689 if (rate_mask & (1 << low))
690 break;
691 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
692 }
693
694 high = index;
695 while (high != IWL_RATE_INVALID) {
696 high = iwl_rates[high].next_rs;
697 if (high == IWL_RATE_INVALID)
698 break;
699 if (rate_mask & (1 << high))
700 break;
701 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
702 }
703
704 return (high << 8) | low;
705 }
706
rs_get_lower_rate(struct iwl_lq_sta * lq_sta,struct iwl_scale_tbl_info * tbl,u8 scale_index,u8 ht_possible)707 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
708 struct iwl_scale_tbl_info *tbl,
709 u8 scale_index, u8 ht_possible)
710 {
711 s32 low;
712 u16 rate_mask;
713 u16 high_low;
714 u8 switch_to_legacy = 0;
715 u8 is_green = lq_sta->is_green;
716
717 /* check if we need to switch from HT to legacy rates.
718 * assumption is that mandatory rates (1Mbps or 6Mbps)
719 * are always supported (spec demand) */
720 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
721 switch_to_legacy = 1;
722 scale_index = rs_ht_to_legacy[scale_index];
723 if (lq_sta->band == IEEE80211_BAND_5GHZ)
724 tbl->lq_type = LQ_A;
725 else
726 tbl->lq_type = LQ_G;
727
728 if (num_of_ant(tbl->ant_type) > 1)
729 tbl->ant_type = ANT_A;/*FIXME:RS*/
730
731 tbl->is_fat = 0;
732 tbl->is_SGI = 0;
733 }
734
735 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
736
737 /* Mask with station rate restriction */
738 if (is_legacy(tbl->lq_type)) {
739 /* supp_rates has no CCK bits in A mode */
740 if (lq_sta->band == IEEE80211_BAND_5GHZ)
741 rate_mask = (u16)(rate_mask &
742 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
743 else
744 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
745 }
746
747 /* If we switched from HT to legacy, check current rate */
748 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
749 low = scale_index;
750 goto out;
751 }
752
753 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
754 tbl->lq_type);
755 low = high_low & 0xff;
756
757 if (low == IWL_RATE_INVALID)
758 low = scale_index;
759
760 out:
761 return rate_n_flags_from_tbl(tbl, low, is_green);
762 }
763
764 /*
765 * mac80211 sends us Tx status
766 */
rs_tx_status(void * priv_r,struct ieee80211_supported_band * sband,struct ieee80211_sta * sta,void * priv_sta,struct sk_buff * skb)767 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
768 struct ieee80211_sta *sta, void *priv_sta,
769 struct sk_buff *skb)
770 {
771 int status;
772 u8 retries;
773 int rs_index, index = 0;
774 struct iwl_lq_sta *lq_sta = priv_sta;
775 struct iwl_link_quality_cmd *table;
776 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
777 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
778 struct ieee80211_hw *hw = priv->hw;
779 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
780 struct iwl_rate_scale_data *window = NULL;
781 struct iwl_rate_scale_data *search_win = NULL;
782 u32 tx_rate;
783 struct iwl_scale_tbl_info tbl_type;
784 struct iwl_scale_tbl_info *curr_tbl, *search_tbl;
785 u8 active_index = 0;
786 s32 tpt = 0;
787
788 IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
789
790 if (!ieee80211_is_data(hdr->frame_control) ||
791 is_multicast_ether_addr(hdr->addr1))
792 return;
793
794 /* This packet was aggregated but doesn't carry rate scale info */
795 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
796 !(info->flags & IEEE80211_TX_STAT_AMPDU))
797 return;
798
799 retries = info->status.rates[0].count - 1;
800
801 if (retries > 15)
802 retries = 15;
803
804 if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
805 !lq_sta->ibss_sta_added)
806 goto out;
807
808 table = &lq_sta->lq;
809 active_index = lq_sta->active_tbl;
810
811 curr_tbl = &(lq_sta->lq_info[active_index]);
812 search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
813 window = (struct iwl_rate_scale_data *)&(curr_tbl->win[0]);
814 search_win = (struct iwl_rate_scale_data *)&(search_tbl->win[0]);
815
816 /*
817 * Ignore this Tx frame response if its initial rate doesn't match
818 * that of latest Link Quality command. There may be stragglers
819 * from a previous Link Quality command, but we're no longer interested
820 * in those; they're either from the "active" mode while we're trying
821 * to check "search" mode, or a prior "search" mode after we've moved
822 * to a new "search" mode (which might become the new "active" mode).
823 */
824 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
825 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
826 if (priv->band == IEEE80211_BAND_5GHZ)
827 rs_index -= IWL_FIRST_OFDM_RATE;
828
829 if ((info->status.rates[0].idx < 0) ||
830 (tbl_type.is_SGI != !!(info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)) ||
831 (tbl_type.is_fat != !!(info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
832 (tbl_type.is_dup != !!(info->status.rates[0].flags & IEEE80211_TX_RC_DUP_DATA)) ||
833 (tbl_type.ant_type != info->antenna_sel_tx) ||
834 (!!(tx_rate & RATE_MCS_HT_MSK) != !!(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) ||
835 (!!(tx_rate & RATE_MCS_GF_MSK) != !!(info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
836 (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
837 hw->wiphy->bands[info->band]->bitrates[info->status.rates[0].idx].bitrate)) {
838 IWL_DEBUG_RATE("initial rate does not match 0x%x\n", tx_rate);
839 /* the last LQ command could failed so the LQ in ucode not
840 * the same in driver sync up
841 */
842 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
843 goto out;
844 }
845
846 /* Update frame history window with "failure" for each Tx retry. */
847 while (retries) {
848 /* Look up the rate and other info used for each tx attempt.
849 * Each tx attempt steps one entry deeper in the rate table. */
850 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
851 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
852 &tbl_type, &rs_index);
853
854 /* If type matches "search" table,
855 * add failure to "search" history */
856 if ((tbl_type.lq_type == search_tbl->lq_type) &&
857 (tbl_type.ant_type == search_tbl->ant_type) &&
858 (tbl_type.is_SGI == search_tbl->is_SGI)) {
859 if (search_tbl->expected_tpt)
860 tpt = search_tbl->expected_tpt[rs_index];
861 else
862 tpt = 0;
863 rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
864
865 /* Else if type matches "current/active" table,
866 * add failure to "current/active" history */
867 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
868 (tbl_type.ant_type == curr_tbl->ant_type) &&
869 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
870 if (curr_tbl->expected_tpt)
871 tpt = curr_tbl->expected_tpt[rs_index];
872 else
873 tpt = 0;
874 rs_collect_tx_data(window, rs_index, tpt, 1, 0);
875 }
876
877 /* If not searching for a new mode, increment failed counter
878 * ... this helps determine when to start searching again */
879 if (lq_sta->stay_in_tbl)
880 lq_sta->total_failed++;
881 --retries;
882 index++;
883
884 }
885
886 /*
887 * Find (by rate) the history window to update with final Tx attempt;
888 * if Tx was successful first try, use original rate,
889 * else look up the rate that was, finally, successful.
890 */
891 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
892 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
893
894 /* Update frame history window with "success" if Tx got ACKed ... */
895 status = !!(info->flags & IEEE80211_TX_STAT_ACK);
896
897 /* If type matches "search" table,
898 * add final tx status to "search" history */
899 if ((tbl_type.lq_type == search_tbl->lq_type) &&
900 (tbl_type.ant_type == search_tbl->ant_type) &&
901 (tbl_type.is_SGI == search_tbl->is_SGI)) {
902 if (search_tbl->expected_tpt)
903 tpt = search_tbl->expected_tpt[rs_index];
904 else
905 tpt = 0;
906 if (info->flags & IEEE80211_TX_CTL_AMPDU)
907 rs_collect_tx_data(search_win, rs_index, tpt,
908 info->status.ampdu_ack_len,
909 info->status.ampdu_ack_map);
910 else
911 rs_collect_tx_data(search_win, rs_index, tpt,
912 1, status);
913 /* Else if type matches "current/active" table,
914 * add final tx status to "current/active" history */
915 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
916 (tbl_type.ant_type == curr_tbl->ant_type) &&
917 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
918 if (curr_tbl->expected_tpt)
919 tpt = curr_tbl->expected_tpt[rs_index];
920 else
921 tpt = 0;
922 if (info->flags & IEEE80211_TX_CTL_AMPDU)
923 rs_collect_tx_data(window, rs_index, tpt,
924 info->status.ampdu_ack_len,
925 info->status.ampdu_ack_map);
926 else
927 rs_collect_tx_data(window, rs_index, tpt,
928 1, status);
929 }
930
931 /* If not searching for new mode, increment success/failed counter
932 * ... these help determine when to start searching again */
933 if (lq_sta->stay_in_tbl) {
934 if (info->flags & IEEE80211_TX_CTL_AMPDU) {
935 lq_sta->total_success += info->status.ampdu_ack_map;
936 lq_sta->total_failed +=
937 (info->status.ampdu_ack_len - info->status.ampdu_ack_map);
938 } else {
939 if (status)
940 lq_sta->total_success++;
941 else
942 lq_sta->total_failed++;
943 }
944 }
945
946 /* See if there's a better rate or modulation mode to try. */
947 if (sta && sta->supp_rates[sband->band])
948 rs_rate_scale_perform(priv, hdr, sta, lq_sta);
949 out:
950 return;
951 }
952
953 /*
954 * Begin a period of staying with a selected modulation mode.
955 * Set "stay_in_tbl" flag to prevent any mode switches.
956 * Set frame tx success limits according to legacy vs. high-throughput,
957 * and reset overall (spanning all rates) tx success history statistics.
958 * These control how long we stay using same modulation mode before
959 * searching for a new mode.
960 */
rs_set_stay_in_table(struct iwl_priv * priv,u8 is_legacy,struct iwl_lq_sta * lq_sta)961 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
962 struct iwl_lq_sta *lq_sta)
963 {
964 IWL_DEBUG_RATE("we are staying in the same table\n");
965 lq_sta->stay_in_tbl = 1; /* only place this gets set */
966 if (is_legacy) {
967 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
968 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
969 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
970 } else {
971 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
972 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
973 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
974 }
975 lq_sta->table_count = 0;
976 lq_sta->total_failed = 0;
977 lq_sta->total_success = 0;
978 }
979
980 /*
981 * Find correct throughput table for given mode of modulation
982 */
rs_set_expected_tpt_table(struct iwl_lq_sta * lq_sta,struct iwl_scale_tbl_info * tbl)983 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
984 struct iwl_scale_tbl_info *tbl)
985 {
986 if (is_legacy(tbl->lq_type)) {
987 if (!is_a_band(tbl->lq_type))
988 tbl->expected_tpt = expected_tpt_G;
989 else
990 tbl->expected_tpt = expected_tpt_A;
991 } else if (is_siso(tbl->lq_type)) {
992 if (tbl->is_fat && !lq_sta->is_dup)
993 if (tbl->is_SGI)
994 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
995 else
996 tbl->expected_tpt = expected_tpt_siso40MHz;
997 else if (tbl->is_SGI)
998 tbl->expected_tpt = expected_tpt_siso20MHzSGI;
999 else
1000 tbl->expected_tpt = expected_tpt_siso20MHz;
1001
1002 } else if (is_mimo(tbl->lq_type)) { /* FIXME:need to separate mimo2/3 */
1003 if (tbl->is_fat && !lq_sta->is_dup)
1004 if (tbl->is_SGI)
1005 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
1006 else
1007 tbl->expected_tpt = expected_tpt_mimo40MHz;
1008 else if (tbl->is_SGI)
1009 tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
1010 else
1011 tbl->expected_tpt = expected_tpt_mimo20MHz;
1012 } else
1013 tbl->expected_tpt = expected_tpt_G;
1014 }
1015
1016 /*
1017 * Find starting rate for new "search" high-throughput mode of modulation.
1018 * Goal is to find lowest expected rate (under perfect conditions) that is
1019 * above the current measured throughput of "active" mode, to give new mode
1020 * a fair chance to prove itself without too many challenges.
1021 *
1022 * This gets called when transitioning to more aggressive modulation
1023 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1024 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1025 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1026 * bit rate will typically need to increase, but not if performance was bad.
1027 */
rs_get_best_rate(struct iwl_priv * priv,struct iwl_lq_sta * lq_sta,struct iwl_scale_tbl_info * tbl,u16 rate_mask,s8 index)1028 static s32 rs_get_best_rate(struct iwl_priv *priv,
1029 struct iwl_lq_sta *lq_sta,
1030 struct iwl_scale_tbl_info *tbl, /* "search" */
1031 u16 rate_mask, s8 index)
1032 {
1033 /* "active" values */
1034 struct iwl_scale_tbl_info *active_tbl =
1035 &(lq_sta->lq_info[lq_sta->active_tbl]);
1036 s32 active_sr = active_tbl->win[index].success_ratio;
1037 s32 active_tpt = active_tbl->expected_tpt[index];
1038
1039 /* expected "search" throughput */
1040 s32 *tpt_tbl = tbl->expected_tpt;
1041
1042 s32 new_rate, high, low, start_hi;
1043 u16 high_low;
1044 s8 rate = index;
1045
1046 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1047
1048 for (; ;) {
1049 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1050 tbl->lq_type);
1051
1052 low = high_low & 0xff;
1053 high = (high_low >> 8) & 0xff;
1054
1055 /*
1056 * Lower the "search" bit rate, to give new "search" mode
1057 * approximately the same throughput as "active" if:
1058 *
1059 * 1) "Active" mode has been working modestly well (but not
1060 * great), and expected "search" throughput (under perfect
1061 * conditions) at candidate rate is above the actual
1062 * measured "active" throughput (but less than expected
1063 * "active" throughput under perfect conditions).
1064 * OR
1065 * 2) "Active" mode has been working perfectly or very well
1066 * and expected "search" throughput (under perfect
1067 * conditions) at candidate rate is above expected
1068 * "active" throughput (under perfect conditions).
1069 */
1070 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1071 ((active_sr > IWL_RATE_DECREASE_TH) &&
1072 (active_sr <= IWL_RATE_HIGH_TH) &&
1073 (tpt_tbl[rate] <= active_tpt))) ||
1074 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1075 (tpt_tbl[rate] > active_tpt))) {
1076
1077 /* (2nd or later pass)
1078 * If we've already tried to raise the rate, and are
1079 * now trying to lower it, use the higher rate. */
1080 if (start_hi != IWL_RATE_INVALID) {
1081 new_rate = start_hi;
1082 break;
1083 }
1084
1085 new_rate = rate;
1086
1087 /* Loop again with lower rate */
1088 if (low != IWL_RATE_INVALID)
1089 rate = low;
1090
1091 /* Lower rate not available, use the original */
1092 else
1093 break;
1094
1095 /* Else try to raise the "search" rate to match "active" */
1096 } else {
1097 /* (2nd or later pass)
1098 * If we've already tried to lower the rate, and are
1099 * now trying to raise it, use the lower rate. */
1100 if (new_rate != IWL_RATE_INVALID)
1101 break;
1102
1103 /* Loop again with higher rate */
1104 else if (high != IWL_RATE_INVALID) {
1105 start_hi = high;
1106 rate = high;
1107
1108 /* Higher rate not available, use the original */
1109 } else {
1110 new_rate = rate;
1111 break;
1112 }
1113 }
1114 }
1115
1116 return new_rate;
1117 }
1118
1119 /*
1120 * Set up search table for MIMO
1121 */
rs_switch_to_mimo2(struct iwl_priv * priv,struct iwl_lq_sta * lq_sta,struct ieee80211_conf * conf,struct ieee80211_sta * sta,struct iwl_scale_tbl_info * tbl,int index)1122 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1123 struct iwl_lq_sta *lq_sta,
1124 struct ieee80211_conf *conf,
1125 struct ieee80211_sta *sta,
1126 struct iwl_scale_tbl_info *tbl, int index)
1127 {
1128 u16 rate_mask;
1129 s32 rate;
1130 s8 is_green = lq_sta->is_green;
1131
1132 if (!conf->ht.enabled || !sta->ht_cap.ht_supported)
1133 return -1;
1134
1135 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1136 == WLAN_HT_CAP_SM_PS_STATIC)
1137 return -1;
1138
1139 /* Need both Tx chains/antennas to support MIMO */
1140 if (priv->hw_params.tx_chains_num < 2)
1141 return -1;
1142
1143 IWL_DEBUG_RATE("LQ: try to switch to MIMO2\n");
1144
1145 tbl->lq_type = LQ_MIMO2;
1146 tbl->is_dup = lq_sta->is_dup;
1147 tbl->action = 0;
1148 rate_mask = lq_sta->active_mimo2_rate;
1149
1150 if (priv->current_ht_config.supported_chan_width
1151 == IWL_CHANNEL_WIDTH_40MHZ)
1152 tbl->is_fat = 1;
1153 else
1154 tbl->is_fat = 0;
1155
1156 /* FIXME: - don't toggle SGI here
1157 if (tbl->is_fat) {
1158 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1159 tbl->is_SGI = 1;
1160 else
1161 tbl->is_SGI = 0;
1162 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1163 tbl->is_SGI = 1;
1164 else
1165 tbl->is_SGI = 0;
1166 */
1167
1168 rs_set_expected_tpt_table(lq_sta, tbl);
1169
1170 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1171
1172 IWL_DEBUG_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1173
1174 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1175 IWL_DEBUG_RATE("Can't switch with index %d rate mask %x\n",
1176 rate, rate_mask);
1177 return -1;
1178 }
1179 tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1180
1181 IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1182 tbl->current_rate, is_green);
1183 return 0;
1184 }
1185
1186 /*
1187 * Set up search table for SISO
1188 */
rs_switch_to_siso(struct iwl_priv * priv,struct iwl_lq_sta * lq_sta,struct ieee80211_conf * conf,struct ieee80211_sta * sta,struct iwl_scale_tbl_info * tbl,int index)1189 static int rs_switch_to_siso(struct iwl_priv *priv,
1190 struct iwl_lq_sta *lq_sta,
1191 struct ieee80211_conf *conf,
1192 struct ieee80211_sta *sta,
1193 struct iwl_scale_tbl_info *tbl, int index)
1194 {
1195 u16 rate_mask;
1196 u8 is_green = lq_sta->is_green;
1197 s32 rate;
1198
1199 if (!conf->ht.enabled || !sta->ht_cap.ht_supported)
1200 return -1;
1201
1202 IWL_DEBUG_RATE("LQ: try to switch to SISO\n");
1203
1204 tbl->is_dup = lq_sta->is_dup;
1205 tbl->lq_type = LQ_SISO;
1206 tbl->action = 0;
1207 rate_mask = lq_sta->active_siso_rate;
1208
1209 if (priv->current_ht_config.supported_chan_width
1210 == IWL_CHANNEL_WIDTH_40MHZ)
1211 tbl->is_fat = 1;
1212 else
1213 tbl->is_fat = 0;
1214
1215 /* FIXME: - don't toggle SGI here
1216 if (tbl->is_fat) {
1217 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1218 tbl->is_SGI = 1;
1219 else
1220 tbl->is_SGI = 0;
1221 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1222 tbl->is_SGI = 1;
1223 else
1224 tbl->is_SGI = 0;
1225 */
1226
1227 if (is_green)
1228 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1229
1230 rs_set_expected_tpt_table(lq_sta, tbl);
1231 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1232
1233 IWL_DEBUG_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask);
1234 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1235 IWL_DEBUG_RATE("can not switch with index %d rate mask %x\n",
1236 rate, rate_mask);
1237 return -1;
1238 }
1239 tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1240 IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1241 tbl->current_rate, is_green);
1242 return 0;
1243 }
1244
1245 /*
1246 * Try to switch to new modulation mode from legacy
1247 */
rs_move_legacy_other(struct iwl_priv * priv,struct iwl_lq_sta * lq_sta,struct ieee80211_conf * conf,struct ieee80211_sta * sta,int index)1248 static int rs_move_legacy_other(struct iwl_priv *priv,
1249 struct iwl_lq_sta *lq_sta,
1250 struct ieee80211_conf *conf,
1251 struct ieee80211_sta *sta,
1252 int index)
1253 {
1254 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1255 struct iwl_scale_tbl_info *search_tbl =
1256 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1257 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1258 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1259 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1260 u8 start_action = tbl->action;
1261 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1262 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1263 int ret = 0;
1264
1265 for (; ;) {
1266 switch (tbl->action) {
1267 case IWL_LEGACY_SWITCH_ANTENNA1:
1268 case IWL_LEGACY_SWITCH_ANTENNA2:
1269 IWL_DEBUG_RATE("LQ: Legacy toggle Antenna\n");
1270
1271 lq_sta->action_counter++;
1272
1273 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1274 tx_chains_num <= 1) ||
1275 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1276 tx_chains_num <= 2))
1277 break;
1278
1279 /* Don't change antenna if success has been great */
1280 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1281 break;
1282
1283 /* Set up search table to try other antenna */
1284 memcpy(search_tbl, tbl, sz);
1285
1286 if (rs_toggle_antenna(valid_tx_ant,
1287 &search_tbl->current_rate, search_tbl)) {
1288 rs_set_expected_tpt_table(lq_sta, search_tbl);
1289 goto out;
1290 }
1291 break;
1292 case IWL_LEGACY_SWITCH_SISO:
1293 IWL_DEBUG_RATE("LQ: Legacy switch to SISO\n");
1294
1295 /* Set up search table to try SISO */
1296 memcpy(search_tbl, tbl, sz);
1297 search_tbl->is_SGI = 0;
1298 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1299 search_tbl, index);
1300 if (!ret) {
1301 lq_sta->action_counter = 0;
1302 goto out;
1303 }
1304
1305 break;
1306 case IWL_LEGACY_SWITCH_MIMO2_AB:
1307 case IWL_LEGACY_SWITCH_MIMO2_AC:
1308 case IWL_LEGACY_SWITCH_MIMO2_BC:
1309 IWL_DEBUG_RATE("LQ: Legacy switch to MIMO2\n");
1310
1311 /* Set up search table to try MIMO */
1312 memcpy(search_tbl, tbl, sz);
1313 search_tbl->is_SGI = 0;
1314
1315 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1316 search_tbl->ant_type = ANT_AB;
1317 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1318 search_tbl->ant_type = ANT_AC;
1319 else
1320 search_tbl->ant_type = ANT_BC;
1321
1322 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1323 break;
1324
1325 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1326 search_tbl, index);
1327 if (!ret) {
1328 lq_sta->action_counter = 0;
1329 goto out;
1330 }
1331 break;
1332 }
1333 tbl->action++;
1334 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2_BC)
1335 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1336
1337 if (tbl->action == start_action)
1338 break;
1339
1340 }
1341 search_tbl->lq_type = LQ_NONE;
1342 return 0;
1343
1344 out:
1345 lq_sta->search_better_tbl = 1;
1346 tbl->action++;
1347 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2_BC)
1348 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1349 return 0;
1350
1351 }
1352
1353 /*
1354 * Try to switch to new modulation mode from SISO
1355 */
rs_move_siso_to_other(struct iwl_priv * priv,struct iwl_lq_sta * lq_sta,struct ieee80211_conf * conf,struct ieee80211_sta * sta,int index)1356 static int rs_move_siso_to_other(struct iwl_priv *priv,
1357 struct iwl_lq_sta *lq_sta,
1358 struct ieee80211_conf *conf,
1359 struct ieee80211_sta *sta, int index)
1360 {
1361 u8 is_green = lq_sta->is_green;
1362 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1363 struct iwl_scale_tbl_info *search_tbl =
1364 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1365 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1366 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1367 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1368 u8 start_action = tbl->action;
1369 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1370 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1371 int ret;
1372
1373 for (;;) {
1374 lq_sta->action_counter++;
1375 switch (tbl->action) {
1376 case IWL_SISO_SWITCH_ANTENNA1:
1377 case IWL_SISO_SWITCH_ANTENNA2:
1378 IWL_DEBUG_RATE("LQ: SISO toggle Antenna\n");
1379
1380 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1381 tx_chains_num <= 1) ||
1382 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1383 tx_chains_num <= 2))
1384 break;
1385
1386 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1387 break;
1388
1389 memcpy(search_tbl, tbl, sz);
1390 if (rs_toggle_antenna(valid_tx_ant,
1391 &search_tbl->current_rate, search_tbl))
1392 goto out;
1393 break;
1394 case IWL_SISO_SWITCH_MIMO2_AB:
1395 case IWL_SISO_SWITCH_MIMO2_AC:
1396 case IWL_SISO_SWITCH_MIMO2_BC:
1397 IWL_DEBUG_RATE("LQ: SISO switch to MIMO2\n");
1398 memcpy(search_tbl, tbl, sz);
1399 search_tbl->is_SGI = 0;
1400
1401 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1402 search_tbl->ant_type = ANT_AB;
1403 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1404 search_tbl->ant_type = ANT_AC;
1405 else
1406 search_tbl->ant_type = ANT_BC;
1407
1408 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1409 break;
1410
1411 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1412 search_tbl, index);
1413 if (!ret)
1414 goto out;
1415 break;
1416 case IWL_SISO_SWITCH_GI:
1417 if (!tbl->is_fat &&
1418 !(priv->current_ht_config.sgf &
1419 HT_SHORT_GI_20MHZ))
1420 break;
1421 if (tbl->is_fat &&
1422 !(priv->current_ht_config.sgf &
1423 HT_SHORT_GI_40MHZ))
1424 break;
1425
1426 IWL_DEBUG_RATE("LQ: SISO toggle SGI/NGI\n");
1427
1428 memcpy(search_tbl, tbl, sz);
1429 if (is_green) {
1430 if (!tbl->is_SGI)
1431 break;
1432 else
1433 IWL_ERROR("SGI was set in GF+SISO\n");
1434 }
1435 search_tbl->is_SGI = !tbl->is_SGI;
1436 rs_set_expected_tpt_table(lq_sta, search_tbl);
1437 if (tbl->is_SGI) {
1438 s32 tpt = lq_sta->last_tpt / 100;
1439 if (tpt >= search_tbl->expected_tpt[index])
1440 break;
1441 }
1442 search_tbl->current_rate = rate_n_flags_from_tbl(
1443 search_tbl, index, is_green);
1444 goto out;
1445 }
1446 tbl->action++;
1447 if (tbl->action > IWL_SISO_SWITCH_GI)
1448 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1449
1450 if (tbl->action == start_action)
1451 break;
1452 }
1453 search_tbl->lq_type = LQ_NONE;
1454 return 0;
1455
1456 out:
1457 lq_sta->search_better_tbl = 1;
1458 tbl->action++;
1459 if (tbl->action > IWL_SISO_SWITCH_GI)
1460 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1461 return 0;
1462 }
1463
1464 /*
1465 * Try to switch to new modulation mode from MIMO
1466 */
rs_move_mimo_to_other(struct iwl_priv * priv,struct iwl_lq_sta * lq_sta,struct ieee80211_conf * conf,struct ieee80211_sta * sta,int index)1467 static int rs_move_mimo_to_other(struct iwl_priv *priv,
1468 struct iwl_lq_sta *lq_sta,
1469 struct ieee80211_conf *conf,
1470 struct ieee80211_sta *sta, int index)
1471 {
1472 s8 is_green = lq_sta->is_green;
1473 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1474 struct iwl_scale_tbl_info *search_tbl =
1475 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1476 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1477 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1478 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1479 u8 start_action = tbl->action;
1480 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1481 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1482 int ret;
1483
1484 for (;;) {
1485 lq_sta->action_counter++;
1486 switch (tbl->action) {
1487 case IWL_MIMO2_SWITCH_ANTENNA1:
1488 case IWL_MIMO2_SWITCH_ANTENNA2:
1489 IWL_DEBUG_RATE("LQ: MIMO toggle Antennas\n");
1490
1491 if (tx_chains_num <= 2)
1492 break;
1493
1494 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1495 break;
1496
1497 memcpy(search_tbl, tbl, sz);
1498 if (rs_toggle_antenna(valid_tx_ant,
1499 &search_tbl->current_rate, search_tbl))
1500 goto out;
1501 break;
1502 case IWL_MIMO2_SWITCH_SISO_A:
1503 case IWL_MIMO2_SWITCH_SISO_B:
1504 case IWL_MIMO2_SWITCH_SISO_C:
1505 IWL_DEBUG_RATE("LQ: MIMO2 switch to SISO\n");
1506
1507 /* Set up new search table for SISO */
1508 memcpy(search_tbl, tbl, sz);
1509
1510 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1511 search_tbl->ant_type = ANT_A;
1512 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1513 search_tbl->ant_type = ANT_B;
1514 else
1515 search_tbl->ant_type = ANT_C;
1516
1517 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1518 break;
1519
1520 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1521 search_tbl, index);
1522 if (!ret)
1523 goto out;
1524
1525 break;
1526
1527 case IWL_MIMO2_SWITCH_GI:
1528 if (!tbl->is_fat &&
1529 !(priv->current_ht_config.sgf &
1530 HT_SHORT_GI_20MHZ))
1531 break;
1532 if (tbl->is_fat &&
1533 !(priv->current_ht_config.sgf &
1534 HT_SHORT_GI_40MHZ))
1535 break;
1536
1537 IWL_DEBUG_RATE("LQ: MIMO toggle SGI/NGI\n");
1538
1539 /* Set up new search table for MIMO */
1540 memcpy(search_tbl, tbl, sz);
1541 search_tbl->is_SGI = !tbl->is_SGI;
1542 rs_set_expected_tpt_table(lq_sta, search_tbl);
1543 /*
1544 * If active table already uses the fastest possible
1545 * modulation (dual stream with short guard interval),
1546 * and it's working well, there's no need to look
1547 * for a better type of modulation!
1548 */
1549 if (tbl->is_SGI) {
1550 s32 tpt = lq_sta->last_tpt / 100;
1551 if (tpt >= search_tbl->expected_tpt[index])
1552 break;
1553 }
1554 search_tbl->current_rate = rate_n_flags_from_tbl(
1555 search_tbl, index, is_green);
1556 goto out;
1557
1558 }
1559 tbl->action++;
1560 if (tbl->action > IWL_MIMO2_SWITCH_GI)
1561 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1562
1563 if (tbl->action == start_action)
1564 break;
1565 }
1566 search_tbl->lq_type = LQ_NONE;
1567 return 0;
1568 out:
1569 lq_sta->search_better_tbl = 1;
1570 tbl->action++;
1571 if (tbl->action > IWL_MIMO2_SWITCH_GI)
1572 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1573 return 0;
1574
1575 }
1576
1577 /*
1578 * Check whether we should continue using same modulation mode, or
1579 * begin search for a new mode, based on:
1580 * 1) # tx successes or failures while using this mode
1581 * 2) # times calling this function
1582 * 3) elapsed time in this mode (not used, for now)
1583 */
rs_stay_in_table(struct iwl_lq_sta * lq_sta)1584 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta)
1585 {
1586 struct iwl_scale_tbl_info *tbl;
1587 int i;
1588 int active_tbl;
1589 int flush_interval_passed = 0;
1590 struct iwl_priv *priv;
1591
1592 priv = lq_sta->drv;
1593 active_tbl = lq_sta->active_tbl;
1594
1595 tbl = &(lq_sta->lq_info[active_tbl]);
1596
1597 /* If we've been disallowing search, see if we should now allow it */
1598 if (lq_sta->stay_in_tbl) {
1599
1600 /* Elapsed time using current modulation mode */
1601 if (lq_sta->flush_timer)
1602 flush_interval_passed =
1603 time_after(jiffies,
1604 (unsigned long)(lq_sta->flush_timer +
1605 IWL_RATE_SCALE_FLUSH_INTVL));
1606
1607 /*
1608 * Check if we should allow search for new modulation mode.
1609 * If many frames have failed or succeeded, or we've used
1610 * this same modulation for a long time, allow search, and
1611 * reset history stats that keep track of whether we should
1612 * allow a new search. Also (below) reset all bitmaps and
1613 * stats in active history.
1614 */
1615 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1616 (lq_sta->total_success > lq_sta->max_success_limit) ||
1617 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1618 && (flush_interval_passed))) {
1619 IWL_DEBUG_RATE("LQ: stay is expired %d %d %d\n:",
1620 lq_sta->total_failed,
1621 lq_sta->total_success,
1622 flush_interval_passed);
1623
1624 /* Allow search for new mode */
1625 lq_sta->stay_in_tbl = 0; /* only place reset */
1626 lq_sta->total_failed = 0;
1627 lq_sta->total_success = 0;
1628 lq_sta->flush_timer = 0;
1629
1630 /*
1631 * Else if we've used this modulation mode enough repetitions
1632 * (regardless of elapsed time or success/failure), reset
1633 * history bitmaps and rate-specific stats for all rates in
1634 * active table.
1635 */
1636 } else {
1637 lq_sta->table_count++;
1638 if (lq_sta->table_count >=
1639 lq_sta->table_count_limit) {
1640 lq_sta->table_count = 0;
1641
1642 IWL_DEBUG_RATE("LQ: stay in table clear win\n");
1643 for (i = 0; i < IWL_RATE_COUNT; i++)
1644 rs_rate_scale_clear_window(
1645 &(tbl->win[i]));
1646 }
1647 }
1648
1649 /* If transitioning to allow "search", reset all history
1650 * bitmaps and stats in active table (this will become the new
1651 * "search" table). */
1652 if (!lq_sta->stay_in_tbl) {
1653 for (i = 0; i < IWL_RATE_COUNT; i++)
1654 rs_rate_scale_clear_window(&(tbl->win[i]));
1655 }
1656 }
1657 }
1658
1659 /*
1660 * Do rate scaling and search for new modulation mode.
1661 */
rs_rate_scale_perform(struct iwl_priv * priv,struct ieee80211_hdr * hdr,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta)1662 static void rs_rate_scale_perform(struct iwl_priv *priv,
1663 struct ieee80211_hdr *hdr,
1664 struct ieee80211_sta *sta,
1665 struct iwl_lq_sta *lq_sta)
1666 {
1667 struct ieee80211_hw *hw = priv->hw;
1668 struct ieee80211_conf *conf = &hw->conf;
1669 int low = IWL_RATE_INVALID;
1670 int high = IWL_RATE_INVALID;
1671 int index;
1672 int i;
1673 struct iwl_rate_scale_data *window = NULL;
1674 int current_tpt = IWL_INVALID_VALUE;
1675 int low_tpt = IWL_INVALID_VALUE;
1676 int high_tpt = IWL_INVALID_VALUE;
1677 u32 fail_count;
1678 s8 scale_action = 0;
1679 u16 rate_mask;
1680 u8 update_lq = 0;
1681 struct iwl_scale_tbl_info *tbl, *tbl1;
1682 u16 rate_scale_index_msk = 0;
1683 u32 rate;
1684 u8 is_green = 0;
1685 u8 active_tbl = 0;
1686 u8 done_search = 0;
1687 u16 high_low;
1688 s32 sr;
1689 u8 tid = MAX_TID_COUNT;
1690
1691 IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1692
1693 /* Send management frames and broadcast/multicast data using
1694 * lowest rate. */
1695 /* TODO: this could probably be improved.. */
1696 if (!ieee80211_is_data(hdr->frame_control) ||
1697 is_multicast_ether_addr(hdr->addr1))
1698 return;
1699
1700 if (!sta || !lq_sta)
1701 return;
1702
1703 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
1704
1705 tid = rs_tl_add_packet(lq_sta, hdr);
1706
1707 /*
1708 * Select rate-scale / modulation-mode table to work with in
1709 * the rest of this function: "search" if searching for better
1710 * modulation mode, or "active" if doing rate scaling within a mode.
1711 */
1712 if (!lq_sta->search_better_tbl)
1713 active_tbl = lq_sta->active_tbl;
1714 else
1715 active_tbl = 1 - lq_sta->active_tbl;
1716
1717 tbl = &(lq_sta->lq_info[active_tbl]);
1718 is_green = lq_sta->is_green;
1719
1720 /* current tx rate */
1721 index = lq_sta->last_txrate_idx;
1722
1723 IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1724 tbl->lq_type);
1725
1726 /* rates available for this association, and for modulation mode */
1727 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
1728
1729 IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1730
1731 /* mask with station rate restriction */
1732 if (is_legacy(tbl->lq_type)) {
1733 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1734 /* supp_rates has no CCK bits in A mode */
1735 rate_scale_index_msk = (u16) (rate_mask &
1736 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1737 else
1738 rate_scale_index_msk = (u16) (rate_mask &
1739 lq_sta->supp_rates);
1740
1741 } else
1742 rate_scale_index_msk = rate_mask;
1743
1744 if (!rate_scale_index_msk)
1745 rate_scale_index_msk = rate_mask;
1746
1747 if (!((1 << index) & rate_scale_index_msk)) {
1748 IWL_ERROR("Current Rate is not valid\n");
1749 return;
1750 }
1751
1752 /* Get expected throughput table and history window for current rate */
1753 if (!tbl->expected_tpt) {
1754 IWL_ERROR("tbl->expected_tpt is NULL\n");
1755 return;
1756 }
1757
1758 window = &(tbl->win[index]);
1759
1760 /*
1761 * If there is not enough history to calculate actual average
1762 * throughput, keep analyzing results of more tx frames, without
1763 * changing rate or mode (bypass most of the rest of this function).
1764 * Set up new rate table in uCode only if old rate is not supported
1765 * in current association (use new rate found above).
1766 */
1767 fail_count = window->counter - window->success_counter;
1768 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1769 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
1770 IWL_DEBUG_RATE("LQ: still below TH. succ=%d total=%d "
1771 "for index %d\n",
1772 window->success_counter, window->counter, index);
1773
1774 /* Can't calculate this yet; not enough history */
1775 window->average_tpt = IWL_INVALID_VALUE;
1776
1777 /* Should we stay with this modulation mode,
1778 * or search for a new one? */
1779 rs_stay_in_table(lq_sta);
1780
1781 goto out;
1782 }
1783
1784 /* Else we have enough samples; calculate estimate of
1785 * actual average throughput */
1786
1787 BUG_ON(window->average_tpt != ((window->success_ratio *
1788 tbl->expected_tpt[index] + 64) / 128));
1789
1790 /* If we are searching for better modulation mode, check success. */
1791 if (lq_sta->search_better_tbl) {
1792
1793 /* If good success, continue using the "search" mode;
1794 * no need to send new link quality command, since we're
1795 * continuing to use the setup that we've been trying. */
1796 if (window->average_tpt > lq_sta->last_tpt) {
1797
1798 IWL_DEBUG_RATE("LQ: SWITCHING TO NEW TABLE "
1799 "suc=%d cur-tpt=%d old-tpt=%d\n",
1800 window->success_ratio,
1801 window->average_tpt,
1802 lq_sta->last_tpt);
1803
1804 if (!is_legacy(tbl->lq_type))
1805 lq_sta->enable_counter = 1;
1806
1807 /* Swap tables; "search" becomes "active" */
1808 lq_sta->active_tbl = active_tbl;
1809 current_tpt = window->average_tpt;
1810
1811 /* Else poor success; go back to mode in "active" table */
1812 } else {
1813
1814 IWL_DEBUG_RATE("LQ: GOING BACK TO THE OLD TABLE "
1815 "suc=%d cur-tpt=%d old-tpt=%d\n",
1816 window->success_ratio,
1817 window->average_tpt,
1818 lq_sta->last_tpt);
1819
1820 /* Nullify "search" table */
1821 tbl->lq_type = LQ_NONE;
1822
1823 /* Revert to "active" table */
1824 active_tbl = lq_sta->active_tbl;
1825 tbl = &(lq_sta->lq_info[active_tbl]);
1826
1827 /* Revert to "active" rate and throughput info */
1828 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1829 current_tpt = lq_sta->last_tpt;
1830
1831 /* Need to set up a new rate table in uCode */
1832 update_lq = 1;
1833 }
1834
1835 /* Either way, we've made a decision; modulation mode
1836 * search is done, allow rate adjustment next time. */
1837 lq_sta->search_better_tbl = 0;
1838 done_search = 1; /* Don't switch modes below! */
1839 goto lq_update;
1840 }
1841
1842 /* (Else) not in search of better modulation mode, try for better
1843 * starting rate, while staying in this mode. */
1844 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
1845 tbl->lq_type);
1846 low = high_low & 0xff;
1847 high = (high_low >> 8) & 0xff;
1848
1849 sr = window->success_ratio;
1850
1851 /* Collect measured throughputs for current and adjacent rates */
1852 current_tpt = window->average_tpt;
1853 if (low != IWL_RATE_INVALID)
1854 low_tpt = tbl->win[low].average_tpt;
1855 if (high != IWL_RATE_INVALID)
1856 high_tpt = tbl->win[high].average_tpt;
1857
1858 scale_action = 0;
1859
1860 /* Too many failures, decrease rate */
1861 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
1862 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1863 scale_action = -1;
1864
1865 /* No throughput measured yet for adjacent rates; try increase. */
1866 } else if ((low_tpt == IWL_INVALID_VALUE) &&
1867 (high_tpt == IWL_INVALID_VALUE)) {
1868
1869 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
1870 scale_action = 1;
1871 else if (low != IWL_RATE_INVALID)
1872 scale_action = -1;
1873 }
1874
1875 /* Both adjacent throughputs are measured, but neither one has better
1876 * throughput; we're using the best rate, don't change it! */
1877 else if ((low_tpt != IWL_INVALID_VALUE) &&
1878 (high_tpt != IWL_INVALID_VALUE) &&
1879 (low_tpt < current_tpt) &&
1880 (high_tpt < current_tpt))
1881 scale_action = 0;
1882
1883 /* At least one adjacent rate's throughput is measured,
1884 * and may have better performance. */
1885 else {
1886 /* Higher adjacent rate's throughput is measured */
1887 if (high_tpt != IWL_INVALID_VALUE) {
1888 /* Higher rate has better throughput */
1889 if (high_tpt > current_tpt &&
1890 sr >= IWL_RATE_INCREASE_TH) {
1891 scale_action = 1;
1892 } else {
1893 IWL_DEBUG_RATE
1894 ("decrease rate because of high tpt\n");
1895 scale_action = -1;
1896 }
1897
1898 /* Lower adjacent rate's throughput is measured */
1899 } else if (low_tpt != IWL_INVALID_VALUE) {
1900 /* Lower rate has better throughput */
1901 if (low_tpt > current_tpt) {
1902 IWL_DEBUG_RATE
1903 ("decrease rate because of low tpt\n");
1904 scale_action = -1;
1905 } else if (sr >= IWL_RATE_INCREASE_TH) {
1906 scale_action = 1;
1907 }
1908 }
1909 }
1910
1911 /* Sanity check; asked for decrease, but success rate or throughput
1912 * has been good at old rate. Don't change it. */
1913 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
1914 ((sr > IWL_RATE_HIGH_TH) ||
1915 (current_tpt > (100 * tbl->expected_tpt[low]))))
1916 scale_action = 0;
1917
1918 switch (scale_action) {
1919 case -1:
1920 /* Decrease starting rate, update uCode's rate table */
1921 if (low != IWL_RATE_INVALID) {
1922 update_lq = 1;
1923 index = low;
1924 }
1925 break;
1926 case 1:
1927 /* Increase starting rate, update uCode's rate table */
1928 if (high != IWL_RATE_INVALID) {
1929 update_lq = 1;
1930 index = high;
1931 }
1932
1933 break;
1934 case 0:
1935 /* No change */
1936 default:
1937 break;
1938 }
1939
1940 IWL_DEBUG_RATE("choose rate scale index %d action %d low %d "
1941 "high %d type %d\n",
1942 index, scale_action, low, high, tbl->lq_type);
1943
1944 lq_update:
1945 /* Replace uCode's rate table for the destination station. */
1946 if (update_lq) {
1947 rate = rate_n_flags_from_tbl(tbl, index, is_green);
1948 rs_fill_link_cmd(priv, lq_sta, rate);
1949 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1950 }
1951
1952 /* Should we stay with this modulation mode, or search for a new one? */
1953 rs_stay_in_table(lq_sta);
1954
1955 /*
1956 * Search for new modulation mode if we're:
1957 * 1) Not changing rates right now
1958 * 2) Not just finishing up a search
1959 * 3) Allowing a new search
1960 */
1961 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
1962 /* Save current throughput to compare with "search" throughput*/
1963 lq_sta->last_tpt = current_tpt;
1964
1965 /* Select a new "search" modulation mode to try.
1966 * If one is found, set up the new "search" table. */
1967 if (is_legacy(tbl->lq_type))
1968 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
1969 else if (is_siso(tbl->lq_type))
1970 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
1971 else
1972 rs_move_mimo_to_other(priv, lq_sta, conf, sta, index);
1973
1974 /* If new "search" mode was selected, set up in uCode table */
1975 if (lq_sta->search_better_tbl) {
1976 /* Access the "search" table, clear its history. */
1977 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1978 for (i = 0; i < IWL_RATE_COUNT; i++)
1979 rs_rate_scale_clear_window(&(tbl->win[i]));
1980
1981 /* Use new "search" start rate */
1982 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1983
1984 IWL_DEBUG_RATE("Switch current mcs: %X index: %d\n",
1985 tbl->current_rate, index);
1986 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
1987 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1988 }
1989
1990 /* If the "active" (non-search) mode was legacy,
1991 * and we've tried switching antennas,
1992 * but we haven't been able to try HT modes (not available),
1993 * stay with best antenna legacy modulation for a while
1994 * before next round of mode comparisons. */
1995 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
1996 if (is_legacy(tbl1->lq_type) && !conf->ht.enabled &&
1997 lq_sta->action_counter >= 1) {
1998 lq_sta->action_counter = 0;
1999 IWL_DEBUG_RATE("LQ: STAY in legacy table\n");
2000 rs_set_stay_in_table(priv, 1, lq_sta);
2001 }
2002
2003 /* If we're in an HT mode, and all 3 mode switch actions
2004 * have been tried and compared, stay in this best modulation
2005 * mode for a while before next round of mode comparisons. */
2006 if (lq_sta->enable_counter &&
2007 (lq_sta->action_counter >= IWL_ACTION_LIMIT)) {
2008 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2009 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2010 (tid != MAX_TID_COUNT)) {
2011 IWL_DEBUG_RATE("try to aggregate tid %d\n", tid);
2012 rs_tl_turn_on_agg(priv, tid, lq_sta, sta);
2013 }
2014 lq_sta->action_counter = 0;
2015 rs_set_stay_in_table(priv, 0, lq_sta);
2016 }
2017
2018 /*
2019 * Else, don't search for a new modulation mode.
2020 * Put new timestamp in stay-in-modulation-mode flush timer if:
2021 * 1) Not changing rates right now
2022 * 2) Not just finishing up a search
2023 * 3) flush timer is empty
2024 */
2025 } else {
2026 if ((!update_lq) && (!done_search) && (!lq_sta->flush_timer))
2027 lq_sta->flush_timer = jiffies;
2028 }
2029
2030 out:
2031 tbl->current_rate = rate_n_flags_from_tbl(tbl, index, is_green);
2032 i = index;
2033 lq_sta->last_txrate_idx = i;
2034
2035 return;
2036 }
2037
2038
rs_initialize_lq(struct iwl_priv * priv,struct ieee80211_conf * conf,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta)2039 static void rs_initialize_lq(struct iwl_priv *priv,
2040 struct ieee80211_conf *conf,
2041 struct ieee80211_sta *sta,
2042 struct iwl_lq_sta *lq_sta)
2043 {
2044 struct iwl_scale_tbl_info *tbl;
2045 int rate_idx;
2046 int i;
2047 u32 rate;
2048 u8 use_green = rs_use_green(priv, conf);
2049 u8 active_tbl = 0;
2050 u8 valid_tx_ant;
2051
2052 if (!sta || !lq_sta)
2053 goto out;
2054
2055 i = lq_sta->last_txrate_idx;
2056
2057 if ((lq_sta->lq.sta_id == 0xff) &&
2058 (priv->iw_mode == NL80211_IFTYPE_ADHOC))
2059 goto out;
2060
2061 valid_tx_ant = priv->hw_params.valid_tx_ant;
2062
2063 if (!lq_sta->search_better_tbl)
2064 active_tbl = lq_sta->active_tbl;
2065 else
2066 active_tbl = 1 - lq_sta->active_tbl;
2067
2068 tbl = &(lq_sta->lq_info[active_tbl]);
2069
2070 if ((i < 0) || (i >= IWL_RATE_COUNT))
2071 i = 0;
2072
2073 rate = iwl_rates[i].plcp;
2074 tbl->ant_type = first_antenna(valid_tx_ant);
2075 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2076
2077 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2078 rate |= RATE_MCS_CCK_MSK;
2079
2080 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2081 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2082 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2083
2084 rate = rate_n_flags_from_tbl(tbl, rate_idx, use_green);
2085 tbl->current_rate = rate;
2086 rs_set_expected_tpt_table(lq_sta, tbl);
2087 rs_fill_link_cmd(NULL, lq_sta, rate);
2088 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2089 out:
2090 return;
2091 }
2092
rs_get_rate(void * priv_r,struct ieee80211_sta * sta,void * priv_sta,struct ieee80211_tx_rate_control * txrc)2093 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2094 struct ieee80211_tx_rate_control *txrc)
2095 {
2096
2097 struct sk_buff *skb = txrc->skb;
2098 struct ieee80211_supported_band *sband = txrc->sband;
2099 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2100 struct ieee80211_conf *conf = &priv->hw->conf;
2101 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2102 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2103 struct iwl_lq_sta *lq_sta = priv_sta;
2104 int rate_idx;
2105 u64 mask_bit = 0;
2106
2107 IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2108
2109 if (sta)
2110 mask_bit = sta->supp_rates[sband->band];
2111
2112 /* Send management frames and broadcast/multicast data using lowest
2113 * rate. */
2114 if (!ieee80211_is_data(hdr->frame_control) ||
2115 is_multicast_ether_addr(hdr->addr1) || !sta || !lq_sta) {
2116 if (!mask_bit)
2117 info->control.rates[0].idx =
2118 rate_lowest_index(sband, NULL);
2119 else
2120 info->control.rates[0].idx =
2121 rate_lowest_index(sband, sta);
2122 return;
2123 }
2124
2125 rate_idx = lq_sta->last_txrate_idx;
2126
2127 if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
2128 !lq_sta->ibss_sta_added) {
2129 u8 sta_id = iwl_find_station(priv, hdr->addr1);
2130
2131 if (sta_id == IWL_INVALID_STATION) {
2132 IWL_DEBUG_RATE("LQ: ADD station %pM\n",
2133 hdr->addr1);
2134 sta_id = iwl_add_station_flags(priv, hdr->addr1,
2135 0, CMD_ASYNC, NULL);
2136 }
2137 if ((sta_id != IWL_INVALID_STATION)) {
2138 lq_sta->lq.sta_id = sta_id;
2139 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2140 lq_sta->ibss_sta_added = 1;
2141 rs_initialize_lq(priv, conf, sta, lq_sta);
2142 }
2143 }
2144
2145 if (rate_idx < 0 || rate_idx > IWL_RATE_COUNT)
2146 rate_idx = rate_lowest_index(sband, sta);
2147 else if (sband->band == IEEE80211_BAND_5GHZ)
2148 rate_idx -= IWL_FIRST_OFDM_RATE;
2149
2150 info->control.rates[0].idx = rate_idx;
2151 }
2152
rs_alloc_sta(void * priv_rate,struct ieee80211_sta * sta,gfp_t gfp)2153 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2154 gfp_t gfp)
2155 {
2156 struct iwl_lq_sta *lq_sta;
2157 struct iwl_priv *priv;
2158 int i, j;
2159
2160 priv = (struct iwl_priv *)priv_rate;
2161 IWL_DEBUG_RATE("create station rate scale window\n");
2162
2163 lq_sta = kzalloc(sizeof(struct iwl_lq_sta), gfp);
2164
2165 if (lq_sta == NULL)
2166 return NULL;
2167 lq_sta->lq.sta_id = 0xff;
2168
2169
2170 for (j = 0; j < LQ_SIZE; j++)
2171 for (i = 0; i < IWL_RATE_COUNT; i++)
2172 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2173
2174 return lq_sta;
2175 }
2176
rs_rate_init(void * priv_r,struct ieee80211_supported_band * sband,struct ieee80211_sta * sta,void * priv_sta)2177 static void rs_rate_init(void *priv_r, struct ieee80211_supported_band *sband,
2178 struct ieee80211_sta *sta, void *priv_sta)
2179 {
2180 int i, j;
2181 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2182 struct ieee80211_conf *conf = &priv->hw->conf;
2183 struct iwl_lq_sta *lq_sta = priv_sta;
2184 u16 mask_bit = 0;
2185
2186 lq_sta->flush_timer = 0;
2187 lq_sta->supp_rates = sta->supp_rates[sband->band];
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 station 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 == NL80211_IFTYPE_AP) {
2200 u8 sta_id = iwl_find_station(priv, sta->addr);
2201
2202 /* for IBSS the call are from tasklet */
2203 IWL_DEBUG_RATE("LQ: ADD station %pM\n", sta->addr);
2204
2205 if (sta_id == IWL_INVALID_STATION) {
2206 IWL_DEBUG_RATE("LQ: ADD station %pM\n", sta->addr);
2207 sta_id = iwl_add_station_flags(priv, sta->addr,
2208 0, CMD_ASYNC, NULL);
2209 }
2210 if ((sta_id != IWL_INVALID_STATION)) {
2211 lq_sta->lq.sta_id = sta_id;
2212 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2213 }
2214 /* FIXME: this is w/a remove it later */
2215 priv->assoc_station_added = 1;
2216 }
2217
2218 lq_sta->is_dup = 0;
2219 lq_sta->is_green = rs_use_green(priv, conf);
2220 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2221 lq_sta->active_rate_basic = priv->active_rate_basic;
2222 lq_sta->band = priv->band;
2223 /*
2224 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2225 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2226 */
2227 lq_sta->active_siso_rate = sta->ht_cap.mcs.rx_mask[0] << 1;
2228 lq_sta->active_siso_rate |= sta->ht_cap.mcs.rx_mask[0] & 0x1;
2229 lq_sta->active_siso_rate &= ~((u16)0x2);
2230 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2231
2232 /* Same here */
2233 lq_sta->active_mimo2_rate = sta->ht_cap.mcs.rx_mask[1] << 1;
2234 lq_sta->active_mimo2_rate |= sta->ht_cap.mcs.rx_mask[1] & 0x1;
2235 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2236 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2237
2238 lq_sta->active_mimo3_rate = sta->ht_cap.mcs.rx_mask[2] << 1;
2239 lq_sta->active_mimo3_rate |= sta->ht_cap.mcs.rx_mask[2] & 0x1;
2240 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2241 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2242
2243 IWL_DEBUG_RATE("SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2244 lq_sta->active_siso_rate,
2245 lq_sta->active_mimo2_rate,
2246 lq_sta->active_mimo3_rate);
2247
2248 /* These values will be overridden later */
2249 lq_sta->lq.general_params.single_stream_ant_msk = ANT_A;
2250 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2251
2252 /* as default allow aggregation for all tids */
2253 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2254 lq_sta->drv = priv;
2255
2256 /* Find highest tx rate supported by hardware and destination station */
2257 mask_bit = sta->supp_rates[sband->band] & lq_sta->active_legacy_rate;
2258 lq_sta->last_txrate_idx = 3;
2259 for (i = 0; i < sband->n_bitrates; i++)
2260 if (mask_bit & BIT(i))
2261 lq_sta->last_txrate_idx = i;
2262
2263 /* For MODE_IEEE80211A, skip over cck rates in global rate table */
2264 if (sband->band == IEEE80211_BAND_5GHZ)
2265 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2266
2267 rs_initialize_lq(priv, conf, sta, lq_sta);
2268 }
2269
rs_fill_link_cmd(const struct iwl_priv * priv,struct iwl_lq_sta * lq_sta,u32 new_rate)2270 static void rs_fill_link_cmd(const struct iwl_priv *priv,
2271 struct iwl_lq_sta *lq_sta, u32 new_rate)
2272 {
2273 struct iwl_scale_tbl_info tbl_type;
2274 int index = 0;
2275 int rate_idx;
2276 int repeat_rate = 0;
2277 u8 ant_toggle_cnt = 0;
2278 u8 use_ht_possible = 1;
2279 u8 valid_tx_ant = 0;
2280 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2281
2282 /* Override starting rate (index 0) if needed for debug purposes */
2283 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2284
2285 /* Interpret new_rate (rate_n_flags) */
2286 memset(&tbl_type, 0, sizeof(tbl_type));
2287 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2288 &tbl_type, &rate_idx);
2289
2290 /* How many times should we repeat the initial rate? */
2291 if (is_legacy(tbl_type.lq_type)) {
2292 ant_toggle_cnt = 1;
2293 repeat_rate = IWL_NUMBER_TRY;
2294 } else {
2295 repeat_rate = IWL_HT_NUMBER_TRY;
2296 }
2297
2298 lq_cmd->general_params.mimo_delimiter =
2299 is_mimo(tbl_type.lq_type) ? 1 : 0;
2300
2301 /* Fill 1st table entry (index 0) */
2302 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2303
2304 if (num_of_ant(tbl_type.ant_type) == 1) {
2305 lq_cmd->general_params.single_stream_ant_msk =
2306 tbl_type.ant_type;
2307 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2308 lq_cmd->general_params.dual_stream_ant_msk =
2309 tbl_type.ant_type;
2310 } /* otherwise we don't modify the existing value */
2311
2312 index++;
2313 repeat_rate--;
2314
2315 if (priv)
2316 valid_tx_ant = priv->hw_params.valid_tx_ant;
2317
2318 /* Fill rest of rate table */
2319 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2320 /* Repeat initial/next rate.
2321 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2322 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2323 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2324 if (is_legacy(tbl_type.lq_type)) {
2325 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2326 ant_toggle_cnt++;
2327 else if (priv &&
2328 rs_toggle_antenna(valid_tx_ant,
2329 &new_rate, &tbl_type))
2330 ant_toggle_cnt = 1;
2331 }
2332
2333 /* Override next rate if needed for debug purposes */
2334 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2335
2336 /* Fill next table entry */
2337 lq_cmd->rs_table[index].rate_n_flags =
2338 cpu_to_le32(new_rate);
2339 repeat_rate--;
2340 index++;
2341 }
2342
2343 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2344 &rate_idx);
2345
2346 /* Indicate to uCode which entries might be MIMO.
2347 * If initial rate was MIMO, this will finally end up
2348 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2349 if (is_mimo(tbl_type.lq_type))
2350 lq_cmd->general_params.mimo_delimiter = index;
2351
2352 /* Get next rate */
2353 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2354 use_ht_possible);
2355
2356 /* How many times should we repeat the next rate? */
2357 if (is_legacy(tbl_type.lq_type)) {
2358 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2359 ant_toggle_cnt++;
2360 else if (priv &&
2361 rs_toggle_antenna(valid_tx_ant,
2362 &new_rate, &tbl_type))
2363 ant_toggle_cnt = 1;
2364
2365 repeat_rate = IWL_NUMBER_TRY;
2366 } else {
2367 repeat_rate = IWL_HT_NUMBER_TRY;
2368 }
2369
2370 /* Don't allow HT rates after next pass.
2371 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2372 use_ht_possible = 0;
2373
2374 /* Override next rate if needed for debug purposes */
2375 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2376
2377 /* Fill next table entry */
2378 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2379
2380 index++;
2381 repeat_rate--;
2382 }
2383
2384 lq_cmd->agg_params.agg_frame_cnt_limit = 64;
2385 lq_cmd->agg_params.agg_dis_start_th = 3;
2386 lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
2387 }
2388
rs_alloc(struct ieee80211_hw * hw,struct dentry * debugfsdir)2389 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2390 {
2391 return hw->priv;
2392 }
2393 /* rate scale requires free function to be implemented */
rs_free(void * priv_rate)2394 static void rs_free(void *priv_rate)
2395 {
2396 return;
2397 }
2398
rs_free_sta(void * priv_r,struct ieee80211_sta * sta,void * priv_sta)2399 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
2400 void *priv_sta)
2401 {
2402 struct iwl_lq_sta *lq_sta = priv_sta;
2403 struct iwl_priv *priv __maybe_unused = priv_r;
2404
2405 IWL_DEBUG_RATE("enter\n");
2406 kfree(lq_sta);
2407 IWL_DEBUG_RATE("leave\n");
2408 }
2409
2410
2411 #ifdef CONFIG_MAC80211_DEBUGFS
open_file_generic(struct inode * inode,struct file * file)2412 static int open_file_generic(struct inode *inode, struct file *file)
2413 {
2414 file->private_data = inode->i_private;
2415 return 0;
2416 }
rs_dbgfs_set_mcs(struct iwl_lq_sta * lq_sta,u32 * rate_n_flags,int index)2417 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2418 u32 *rate_n_flags, int index)
2419 {
2420 struct iwl_priv *priv;
2421
2422 priv = lq_sta->drv;
2423 if (lq_sta->dbg_fixed_rate) {
2424 if (index < 12) {
2425 *rate_n_flags = lq_sta->dbg_fixed_rate;
2426 } else {
2427 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2428 *rate_n_flags = 0x800D;
2429 else
2430 *rate_n_flags = 0x820A;
2431 }
2432 IWL_DEBUG_RATE("Fixed rate ON\n");
2433 } else {
2434 IWL_DEBUG_RATE("Fixed rate OFF\n");
2435 }
2436 }
2437
rs_sta_dbgfs_scale_table_write(struct file * file,const char __user * user_buf,size_t count,loff_t * ppos)2438 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2439 const char __user *user_buf, size_t count, loff_t *ppos)
2440 {
2441 struct iwl_lq_sta *lq_sta = file->private_data;
2442 struct iwl_priv *priv;
2443 char buf[64];
2444 int buf_size;
2445 u32 parsed_rate;
2446
2447 priv = lq_sta->drv;
2448 memset(buf, 0, sizeof(buf));
2449 buf_size = min(count, sizeof(buf) - 1);
2450 if (copy_from_user(buf, user_buf, buf_size))
2451 return -EFAULT;
2452
2453 if (sscanf(buf, "%x", &parsed_rate) == 1)
2454 lq_sta->dbg_fixed_rate = parsed_rate;
2455 else
2456 lq_sta->dbg_fixed_rate = 0;
2457
2458 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2459 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2460 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2461 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2462
2463 IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2464 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2465
2466 if (lq_sta->dbg_fixed_rate) {
2467 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2468 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2469 }
2470
2471 return count;
2472 }
2473
rs_sta_dbgfs_scale_table_read(struct file * file,char __user * user_buf,size_t count,loff_t * ppos)2474 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2475 char __user *user_buf, size_t count, loff_t *ppos)
2476 {
2477 char buff[1024];
2478 int desc = 0;
2479 int i = 0;
2480
2481 struct iwl_lq_sta *lq_sta = file->private_data;
2482
2483 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2484 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2485 lq_sta->total_failed, lq_sta->total_success,
2486 lq_sta->active_legacy_rate);
2487 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2488 lq_sta->dbg_fixed_rate);
2489 desc += sprintf(buff+desc, "general:"
2490 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2491 lq_sta->lq.general_params.flags,
2492 lq_sta->lq.general_params.mimo_delimiter,
2493 lq_sta->lq.general_params.single_stream_ant_msk,
2494 lq_sta->lq.general_params.dual_stream_ant_msk);
2495
2496 desc += sprintf(buff+desc, "agg:"
2497 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2498 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2499 lq_sta->lq.agg_params.agg_dis_start_th,
2500 lq_sta->lq.agg_params.agg_frame_cnt_limit);
2501
2502 desc += sprintf(buff+desc,
2503 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2504 lq_sta->lq.general_params.start_rate_index[0],
2505 lq_sta->lq.general_params.start_rate_index[1],
2506 lq_sta->lq.general_params.start_rate_index[2],
2507 lq_sta->lq.general_params.start_rate_index[3]);
2508
2509
2510 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2511 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
2512 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2513
2514 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2515 }
2516
2517 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2518 .write = rs_sta_dbgfs_scale_table_write,
2519 .read = rs_sta_dbgfs_scale_table_read,
2520 .open = open_file_generic,
2521 };
rs_sta_dbgfs_stats_table_read(struct file * file,char __user * user_buf,size_t count,loff_t * ppos)2522 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2523 char __user *user_buf, size_t count, loff_t *ppos)
2524 {
2525 char buff[1024];
2526 int desc = 0;
2527 int i, j;
2528
2529 struct iwl_lq_sta *lq_sta = file->private_data;
2530 for (i = 0; i < LQ_SIZE; i++) {
2531 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2532 "rate=0x%X\n",
2533 lq_sta->active_tbl == i ? "*" : "x",
2534 lq_sta->lq_info[i].lq_type,
2535 lq_sta->lq_info[i].is_SGI,
2536 lq_sta->lq_info[i].is_fat,
2537 lq_sta->lq_info[i].is_dup,
2538 lq_sta->lq_info[i].current_rate);
2539 for (j = 0; j < IWL_RATE_COUNT; j++) {
2540 desc += sprintf(buff+desc,
2541 "counter=%d success=%d %%=%d\n",
2542 lq_sta->lq_info[i].win[j].counter,
2543 lq_sta->lq_info[i].win[j].success_counter,
2544 lq_sta->lq_info[i].win[j].success_ratio);
2545 }
2546 }
2547 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2548 }
2549
2550 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2551 .read = rs_sta_dbgfs_stats_table_read,
2552 .open = open_file_generic,
2553 };
2554
rs_add_debugfs(void * priv,void * priv_sta,struct dentry * dir)2555 static void rs_add_debugfs(void *priv, void *priv_sta,
2556 struct dentry *dir)
2557 {
2558 struct iwl_lq_sta *lq_sta = priv_sta;
2559 lq_sta->rs_sta_dbgfs_scale_table_file =
2560 debugfs_create_file("rate_scale_table", 0600, dir,
2561 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2562 lq_sta->rs_sta_dbgfs_stats_table_file =
2563 debugfs_create_file("rate_stats_table", 0600, dir,
2564 lq_sta, &rs_sta_dbgfs_stats_table_ops);
2565 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2566 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
2567 &lq_sta->tx_agg_tid_en);
2568
2569 }
2570
rs_remove_debugfs(void * priv,void * priv_sta)2571 static void rs_remove_debugfs(void *priv, void *priv_sta)
2572 {
2573 struct iwl_lq_sta *lq_sta = priv_sta;
2574 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2575 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2576 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2577 }
2578 #endif
2579
2580 static struct rate_control_ops rs_ops = {
2581 .module = NULL,
2582 .name = RS_NAME,
2583 .tx_status = rs_tx_status,
2584 .get_rate = rs_get_rate,
2585 .rate_init = rs_rate_init,
2586 .alloc = rs_alloc,
2587 .free = rs_free,
2588 .alloc_sta = rs_alloc_sta,
2589 .free_sta = rs_free_sta,
2590 #ifdef CONFIG_MAC80211_DEBUGFS
2591 .add_sta_debugfs = rs_add_debugfs,
2592 .remove_sta_debugfs = rs_remove_debugfs,
2593 #endif
2594 };
2595
iwlagn_rate_control_register(void)2596 int iwlagn_rate_control_register(void)
2597 {
2598 return ieee80211_rate_control_register(&rs_ops);
2599 }
2600
iwlagn_rate_control_unregister(void)2601 void iwlagn_rate_control_unregister(void)
2602 {
2603 ieee80211_rate_control_unregister(&rs_ops);
2604 }
2605
2606