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iwlagn: minor coex API changes
[deliverable/linux.git] / drivers / net / wireless / iwlwifi / iwl-agn-rs.c
1 /******************************************************************************
2 *
3 * Copyright(c) 2005 - 2010 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/slab.h>
30 #include <linux/wireless.h>
31 #include <net/mac80211.h>
32
33 #include <linux/netdevice.h>
34 #include <linux/etherdevice.h>
35 #include <linux/delay.h>
36
37 #include <linux/workqueue.h>
38
39 #include "iwl-dev.h"
40 #include "iwl-sta.h"
41 #include "iwl-core.h"
42
43 #define RS_NAME "iwl-agn-rs"
44
45 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
46 #define IWL_NUMBER_TRY 1
47 #define IWL_HT_NUMBER_TRY 3
48
49 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
50 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
51 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
52
53 /* max allowed rate miss before sync LQ cmd */
54 #define IWL_MISSED_RATE_MAX 15
55 /* max time to accum history 2 seconds */
56 #define IWL_RATE_SCALE_FLUSH_INTVL (3*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 static void rs_rate_scale_perform(struct iwl_priv *priv,
80 struct sk_buff *skb,
81 struct ieee80211_sta *sta,
82 struct iwl_lq_sta *lq_sta);
83 static void rs_fill_link_cmd(struct iwl_priv *priv,
84 struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
85 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
86
87
88 #ifdef CONFIG_MAC80211_DEBUGFS
89 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
90 u32 *rate_n_flags, int index);
91 #else
92 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
93 u32 *rate_n_flags, int index)
94 {}
95 #endif
96
97 /**
98 * The following tables contain the expected throughput metrics for all rates
99 *
100 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
101 *
102 * where invalid entries are zeros.
103 *
104 * CCK rates are only valid in legacy table and will only be used in G
105 * (2.4 GHz) band.
106 */
107
108 static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
109 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
110 };
111
112 static s32 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
113 {0, 0, 0, 0, 42, 0, 76, 102, 124, 158, 183, 193, 202}, /* Norm */
114 {0, 0, 0, 0, 46, 0, 82, 110, 132, 167, 192, 202, 210}, /* SGI */
115 {0, 0, 0, 0, 48, 0, 93, 135, 176, 251, 319, 351, 381}, /* AGG */
116 {0, 0, 0, 0, 53, 0, 102, 149, 193, 275, 348, 381, 413}, /* AGG+SGI */
117 };
118
119 static s32 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
120 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
121 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
122 {0, 0, 0, 0, 96, 0, 182, 259, 328, 451, 553, 598, 640}, /* AGG */
123 {0, 0, 0, 0, 106, 0, 199, 282, 357, 487, 593, 640, 683}, /* AGG+SGI */
124 };
125
126 static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
127 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250}, /* Norm */
128 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256}, /* SGI */
129 {0, 0, 0, 0, 92, 0, 175, 250, 317, 436, 534, 578, 619}, /* AGG */
130 {0, 0, 0, 0, 102, 0, 192, 273, 344, 470, 573, 619, 660}, /* AGG+SGI*/
131 };
132
133 static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
134 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
135 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
136 {0, 0, 0, 0, 180, 0, 327, 446, 545, 708, 828, 878, 922}, /* AGG */
137 {0, 0, 0, 0, 197, 0, 355, 481, 584, 752, 872, 922, 966}, /* AGG+SGI */
138 };
139
140 static s32 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = {
141 {0, 0, 0, 0, 99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */
142 {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */
143 {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */
144 {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */
145 };
146
147 static s32 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = {
148 {0, 0, 0, 0, 152, 0, 211, 239, 255, 279, 290, 294, 297}, /* Norm */
149 {0, 0, 0, 0, 160, 0, 219, 245, 261, 284, 294, 297, 300}, /* SGI */
150 {0, 0, 0, 0, 254, 0, 443, 584, 695, 868, 984, 1030, 1070}, /* AGG */
151 {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */
152 };
153
154 /* mbps, mcs */
155 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
156 { "1", "BPSK DSSS"},
157 { "2", "QPSK DSSS"},
158 {"5.5", "BPSK CCK"},
159 { "11", "QPSK CCK"},
160 { "6", "BPSK 1/2"},
161 { "9", "BPSK 1/2"},
162 { "12", "QPSK 1/2"},
163 { "18", "QPSK 3/4"},
164 { "24", "16QAM 1/2"},
165 { "36", "16QAM 3/4"},
166 { "48", "64QAM 2/3"},
167 { "54", "64QAM 3/4"},
168 { "60", "64QAM 5/6"},
169 };
170
171 #define MCS_INDEX_PER_STREAM (8)
172
173 static inline u8 rs_extract_rate(u32 rate_n_flags)
174 {
175 return (u8)(rate_n_flags & 0xFF);
176 }
177
178 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
179 {
180 window->data = 0;
181 window->success_counter = 0;
182 window->success_ratio = IWL_INVALID_VALUE;
183 window->counter = 0;
184 window->average_tpt = IWL_INVALID_VALUE;
185 window->stamp = 0;
186 }
187
188 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
189 {
190 return (ant_type & valid_antenna) == ant_type;
191 }
192
193 /*
194 * removes the old data from the statistics. All data that is older than
195 * TID_MAX_TIME_DIFF, will be deleted.
196 */
197 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
198 {
199 /* The oldest age we want to keep */
200 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
201
202 while (tl->queue_count &&
203 (tl->time_stamp < oldest_time)) {
204 tl->total -= tl->packet_count[tl->head];
205 tl->packet_count[tl->head] = 0;
206 tl->time_stamp += TID_QUEUE_CELL_SPACING;
207 tl->queue_count--;
208 tl->head++;
209 if (tl->head >= TID_QUEUE_MAX_SIZE)
210 tl->head = 0;
211 }
212 }
213
214 /*
215 * increment traffic load value for tid and also remove
216 * any old values if passed the certain time period
217 */
218 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
219 struct ieee80211_hdr *hdr)
220 {
221 u32 curr_time = jiffies_to_msecs(jiffies);
222 u32 time_diff;
223 s32 index;
224 struct iwl_traffic_load *tl = NULL;
225 u8 tid;
226
227 if (ieee80211_is_data_qos(hdr->frame_control)) {
228 u8 *qc = ieee80211_get_qos_ctl(hdr);
229 tid = qc[0] & 0xf;
230 } else
231 return MAX_TID_COUNT;
232
233 if (unlikely(tid >= TID_MAX_LOAD_COUNT))
234 return MAX_TID_COUNT;
235
236 tl = &lq_data->load[tid];
237
238 curr_time -= curr_time % TID_ROUND_VALUE;
239
240 /* Happens only for the first packet. Initialize the data */
241 if (!(tl->queue_count)) {
242 tl->total = 1;
243 tl->time_stamp = curr_time;
244 tl->queue_count = 1;
245 tl->head = 0;
246 tl->packet_count[0] = 1;
247 return MAX_TID_COUNT;
248 }
249
250 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
251 index = time_diff / TID_QUEUE_CELL_SPACING;
252
253 /* The history is too long: remove data that is older than */
254 /* TID_MAX_TIME_DIFF */
255 if (index >= TID_QUEUE_MAX_SIZE)
256 rs_tl_rm_old_stats(tl, curr_time);
257
258 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
259 tl->packet_count[index] = tl->packet_count[index] + 1;
260 tl->total = tl->total + 1;
261
262 if ((index + 1) > tl->queue_count)
263 tl->queue_count = index + 1;
264
265 return tid;
266 }
267
268 /*
269 get the traffic load value for tid
270 */
271 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
272 {
273 u32 curr_time = jiffies_to_msecs(jiffies);
274 u32 time_diff;
275 s32 index;
276 struct iwl_traffic_load *tl = NULL;
277
278 if (tid >= TID_MAX_LOAD_COUNT)
279 return 0;
280
281 tl = &(lq_data->load[tid]);
282
283 curr_time -= curr_time % TID_ROUND_VALUE;
284
285 if (!(tl->queue_count))
286 return 0;
287
288 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
289 index = time_diff / TID_QUEUE_CELL_SPACING;
290
291 /* The history is too long: remove data that is older than */
292 /* TID_MAX_TIME_DIFF */
293 if (index >= TID_QUEUE_MAX_SIZE)
294 rs_tl_rm_old_stats(tl, curr_time);
295
296 return tl->total;
297 }
298
299 static int rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
300 struct iwl_lq_sta *lq_data, u8 tid,
301 struct ieee80211_sta *sta)
302 {
303 int ret = -EAGAIN;
304 u32 load;
305
306 /*
307 * Don't create TX aggregation sessions when in high
308 * BT traffic, as they would just be disrupted by BT.
309 */
310 if (priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) {
311 IWL_ERR(priv, "BT traffic (%d), no aggregation allowed\n",
312 priv->bt_traffic_load);
313 return ret;
314 }
315
316 load = rs_tl_get_load(lq_data, tid);
317
318 if (load > IWL_AGG_LOAD_THRESHOLD) {
319 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
320 sta->addr, tid);
321 ret = ieee80211_start_tx_ba_session(sta, tid);
322 if (ret == -EAGAIN) {
323 /*
324 * driver and mac80211 is out of sync
325 * this might be cause by reloading firmware
326 * stop the tx ba session here
327 */
328 IWL_ERR(priv, "Fail start Tx agg on tid: %d\n",
329 tid);
330 ieee80211_stop_tx_ba_session(sta, tid);
331 }
332 } else {
333 IWL_ERR(priv, "Aggregation not enabled for tid %d "
334 "because load = %u\n", tid, load);
335 }
336 return ret;
337 }
338
339 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
340 struct iwl_lq_sta *lq_data,
341 struct ieee80211_sta *sta)
342 {
343 if (tid < TID_MAX_LOAD_COUNT)
344 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
345 else
346 IWL_ERR(priv, "tid exceeds max load count: %d/%d\n",
347 tid, TID_MAX_LOAD_COUNT);
348 }
349
350 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
351 {
352 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
353 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
354 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
355 }
356
357 /*
358 * Static function to get the expected throughput from an iwl_scale_tbl_info
359 * that wraps a NULL pointer check
360 */
361 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
362 {
363 if (tbl->expected_tpt)
364 return tbl->expected_tpt[rs_index];
365 return 0;
366 }
367
368 /**
369 * rs_collect_tx_data - Update the success/failure sliding window
370 *
371 * We keep a sliding window of the last 62 packets transmitted
372 * at this rate. window->data contains the bitmask of successful
373 * packets.
374 */
375 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
376 int scale_index, int attempts, int successes)
377 {
378 struct iwl_rate_scale_data *window = NULL;
379 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
380 s32 fail_count, tpt;
381
382 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
383 return -EINVAL;
384
385 /* Select window for current tx bit rate */
386 window = &(tbl->win[scale_index]);
387
388 /* Get expected throughput */
389 tpt = get_expected_tpt(tbl, scale_index);
390
391 /*
392 * Keep track of only the latest 62 tx frame attempts in this rate's
393 * history window; anything older isn't really relevant any more.
394 * If we have filled up the sliding window, drop the oldest attempt;
395 * if the oldest attempt (highest bit in bitmap) shows "success",
396 * subtract "1" from the success counter (this is the main reason
397 * we keep these bitmaps!).
398 */
399 while (attempts > 0) {
400 if (window->counter >= IWL_RATE_MAX_WINDOW) {
401
402 /* remove earliest */
403 window->counter = IWL_RATE_MAX_WINDOW - 1;
404
405 if (window->data & mask) {
406 window->data &= ~mask;
407 window->success_counter--;
408 }
409 }
410
411 /* Increment frames-attempted counter */
412 window->counter++;
413
414 /* Shift bitmap by one frame to throw away oldest history */
415 window->data <<= 1;
416
417 /* Mark the most recent #successes attempts as successful */
418 if (successes > 0) {
419 window->success_counter++;
420 window->data |= 0x1;
421 successes--;
422 }
423
424 attempts--;
425 }
426
427 /* Calculate current success ratio, avoid divide-by-0! */
428 if (window->counter > 0)
429 window->success_ratio = 128 * (100 * window->success_counter)
430 / window->counter;
431 else
432 window->success_ratio = IWL_INVALID_VALUE;
433
434 fail_count = window->counter - window->success_counter;
435
436 /* Calculate average throughput, if we have enough history. */
437 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
438 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
439 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
440 else
441 window->average_tpt = IWL_INVALID_VALUE;
442
443 /* Tag this window as having been updated */
444 window->stamp = jiffies;
445
446 return 0;
447 }
448
449 /*
450 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
451 */
452 /* FIXME:RS:remove this function and put the flags statically in the table */
453 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
454 struct iwl_scale_tbl_info *tbl,
455 int index, u8 use_green)
456 {
457 u32 rate_n_flags = 0;
458
459 if (is_legacy(tbl->lq_type)) {
460 rate_n_flags = iwl_rates[index].plcp;
461 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
462 rate_n_flags |= RATE_MCS_CCK_MSK;
463
464 } else if (is_Ht(tbl->lq_type)) {
465 if (index > IWL_LAST_OFDM_RATE) {
466 IWL_ERR(priv, "Invalid HT rate index %d\n", index);
467 index = IWL_LAST_OFDM_RATE;
468 }
469 rate_n_flags = RATE_MCS_HT_MSK;
470
471 if (is_siso(tbl->lq_type))
472 rate_n_flags |= iwl_rates[index].plcp_siso;
473 else if (is_mimo2(tbl->lq_type))
474 rate_n_flags |= iwl_rates[index].plcp_mimo2;
475 else
476 rate_n_flags |= iwl_rates[index].plcp_mimo3;
477 } else {
478 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
479 }
480
481 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
482 RATE_MCS_ANT_ABC_MSK);
483
484 if (is_Ht(tbl->lq_type)) {
485 if (tbl->is_ht40) {
486 if (tbl->is_dup)
487 rate_n_flags |= RATE_MCS_DUP_MSK;
488 else
489 rate_n_flags |= RATE_MCS_HT40_MSK;
490 }
491 if (tbl->is_SGI)
492 rate_n_flags |= RATE_MCS_SGI_MSK;
493
494 if (use_green) {
495 rate_n_flags |= RATE_MCS_GF_MSK;
496 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
497 rate_n_flags &= ~RATE_MCS_SGI_MSK;
498 IWL_ERR(priv, "GF was set with SGI:SISO\n");
499 }
500 }
501 }
502 return rate_n_flags;
503 }
504
505 /*
506 * Interpret uCode API's rate_n_flags format,
507 * fill "search" or "active" tx mode table.
508 */
509 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
510 enum ieee80211_band band,
511 struct iwl_scale_tbl_info *tbl,
512 int *rate_idx)
513 {
514 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
515 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
516 u8 mcs;
517
518 memset(tbl, 0, sizeof(struct iwl_scale_tbl_info));
519 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
520
521 if (*rate_idx == IWL_RATE_INVALID) {
522 *rate_idx = -1;
523 return -EINVAL;
524 }
525 tbl->is_SGI = 0; /* default legacy setup */
526 tbl->is_ht40 = 0;
527 tbl->is_dup = 0;
528 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
529 tbl->lq_type = LQ_NONE;
530 tbl->max_search = IWL_MAX_SEARCH;
531
532 /* legacy rate format */
533 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
534 if (num_of_ant == 1) {
535 if (band == IEEE80211_BAND_5GHZ)
536 tbl->lq_type = LQ_A;
537 else
538 tbl->lq_type = LQ_G;
539 }
540 /* HT rate format */
541 } else {
542 if (rate_n_flags & RATE_MCS_SGI_MSK)
543 tbl->is_SGI = 1;
544
545 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
546 (rate_n_flags & RATE_MCS_DUP_MSK))
547 tbl->is_ht40 = 1;
548
549 if (rate_n_flags & RATE_MCS_DUP_MSK)
550 tbl->is_dup = 1;
551
552 mcs = rs_extract_rate(rate_n_flags);
553
554 /* SISO */
555 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
556 if (num_of_ant == 1)
557 tbl->lq_type = LQ_SISO; /*else NONE*/
558 /* MIMO2 */
559 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
560 if (num_of_ant == 2)
561 tbl->lq_type = LQ_MIMO2;
562 /* MIMO3 */
563 } else {
564 if (num_of_ant == 3) {
565 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
566 tbl->lq_type = LQ_MIMO3;
567 }
568 }
569 }
570 return 0;
571 }
572
573 /* switch to another antenna/antennas and return 1 */
574 /* if no other valid antenna found, return 0 */
575 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
576 struct iwl_scale_tbl_info *tbl)
577 {
578 u8 new_ant_type;
579
580 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
581 return 0;
582
583 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
584 return 0;
585
586 new_ant_type = ant_toggle_lookup[tbl->ant_type];
587
588 while ((new_ant_type != tbl->ant_type) &&
589 !rs_is_valid_ant(valid_ant, new_ant_type))
590 new_ant_type = ant_toggle_lookup[new_ant_type];
591
592 if (new_ant_type == tbl->ant_type)
593 return 0;
594
595 tbl->ant_type = new_ant_type;
596 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
597 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
598 return 1;
599 }
600
601 /**
602 * Green-field mode is valid if the station supports it and
603 * there are no non-GF stations present in the BSS.
604 */
605 static bool rs_use_green(struct ieee80211_sta *sta)
606 {
607 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
608 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
609
610 return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
611 !(ctx->ht.non_gf_sta_present);
612 }
613
614 /**
615 * rs_get_supported_rates - get the available rates
616 *
617 * if management frame or broadcast frame only return
618 * basic available rates.
619 *
620 */
621 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
622 struct ieee80211_hdr *hdr,
623 enum iwl_table_type rate_type)
624 {
625 if (is_legacy(rate_type)) {
626 return lq_sta->active_legacy_rate;
627 } else {
628 if (is_siso(rate_type))
629 return lq_sta->active_siso_rate;
630 else if (is_mimo2(rate_type))
631 return lq_sta->active_mimo2_rate;
632 else
633 return lq_sta->active_mimo3_rate;
634 }
635 }
636
637 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
638 int rate_type)
639 {
640 u8 high = IWL_RATE_INVALID;
641 u8 low = IWL_RATE_INVALID;
642
643 /* 802.11A or ht walks to the next literal adjacent rate in
644 * the rate table */
645 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
646 int i;
647 u32 mask;
648
649 /* Find the previous rate that is in the rate mask */
650 i = index - 1;
651 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
652 if (rate_mask & mask) {
653 low = i;
654 break;
655 }
656 }
657
658 /* Find the next rate that is in the rate mask */
659 i = index + 1;
660 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
661 if (rate_mask & mask) {
662 high = i;
663 break;
664 }
665 }
666
667 return (high << 8) | low;
668 }
669
670 low = index;
671 while (low != IWL_RATE_INVALID) {
672 low = iwl_rates[low].prev_rs;
673 if (low == IWL_RATE_INVALID)
674 break;
675 if (rate_mask & (1 << low))
676 break;
677 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
678 }
679
680 high = index;
681 while (high != IWL_RATE_INVALID) {
682 high = iwl_rates[high].next_rs;
683 if (high == IWL_RATE_INVALID)
684 break;
685 if (rate_mask & (1 << high))
686 break;
687 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
688 }
689
690 return (high << 8) | low;
691 }
692
693 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
694 struct iwl_scale_tbl_info *tbl,
695 u8 scale_index, u8 ht_possible)
696 {
697 s32 low;
698 u16 rate_mask;
699 u16 high_low;
700 u8 switch_to_legacy = 0;
701 u8 is_green = lq_sta->is_green;
702 struct iwl_priv *priv = lq_sta->drv;
703
704 /* check if we need to switch from HT to legacy rates.
705 * assumption is that mandatory rates (1Mbps or 6Mbps)
706 * are always supported (spec demand) */
707 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
708 switch_to_legacy = 1;
709 scale_index = rs_ht_to_legacy[scale_index];
710 if (lq_sta->band == IEEE80211_BAND_5GHZ)
711 tbl->lq_type = LQ_A;
712 else
713 tbl->lq_type = LQ_G;
714
715 if (num_of_ant(tbl->ant_type) > 1)
716 tbl->ant_type =
717 first_antenna(priv->hw_params.valid_tx_ant);
718
719 tbl->is_ht40 = 0;
720 tbl->is_SGI = 0;
721 tbl->max_search = IWL_MAX_SEARCH;
722 }
723
724 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
725
726 /* Mask with station rate restriction */
727 if (is_legacy(tbl->lq_type)) {
728 /* supp_rates has no CCK bits in A mode */
729 if (lq_sta->band == IEEE80211_BAND_5GHZ)
730 rate_mask = (u16)(rate_mask &
731 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
732 else
733 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
734 }
735
736 /* If we switched from HT to legacy, check current rate */
737 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
738 low = scale_index;
739 goto out;
740 }
741
742 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
743 tbl->lq_type);
744 low = high_low & 0xff;
745
746 if (low == IWL_RATE_INVALID)
747 low = scale_index;
748
749 out:
750 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
751 }
752
753 /*
754 * Simple function to compare two rate scale table types
755 */
756 static bool table_type_matches(struct iwl_scale_tbl_info *a,
757 struct iwl_scale_tbl_info *b)
758 {
759 return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
760 (a->is_SGI == b->is_SGI);
761 }
762
763 static void rs_bt_update_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
764 struct iwl_lq_sta *lq_sta)
765 {
766 struct iwl_scale_tbl_info *tbl;
767 bool full_concurrent;
768 unsigned long flags;
769
770 spin_lock_irqsave(&priv->lock, flags);
771 if (priv->bt_ci_compliance && priv->bt_ant_couple_ok)
772 full_concurrent = true;
773 else
774 full_concurrent = false;
775 spin_unlock_irqrestore(&priv->lock, flags);
776
777 if (priv->bt_full_concurrent != full_concurrent) {
778 priv->bt_full_concurrent = full_concurrent;
779
780 /* Update uCode's rate table. */
781 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
782 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
783 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
784
785 queue_work(priv->workqueue, &priv->bt_full_concurrency);
786 }
787 }
788
789 /*
790 * mac80211 sends us Tx status
791 */
792 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
793 struct ieee80211_sta *sta, void *priv_sta,
794 struct sk_buff *skb)
795 {
796 int legacy_success;
797 int retries;
798 int rs_index, mac_index, i;
799 struct iwl_lq_sta *lq_sta = priv_sta;
800 struct iwl_link_quality_cmd *table;
801 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
802 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
803 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
804 enum mac80211_rate_control_flags mac_flags;
805 u32 tx_rate;
806 struct iwl_scale_tbl_info tbl_type;
807 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
808 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
809 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
810
811 IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
812
813 /* Treat uninitialized rate scaling data same as non-existing. */
814 if (!lq_sta) {
815 IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n");
816 return;
817 } else if (!lq_sta->drv) {
818 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
819 return;
820 }
821
822 if (!ieee80211_is_data(hdr->frame_control) ||
823 info->flags & IEEE80211_TX_CTL_NO_ACK)
824 return;
825
826 /* This packet was aggregated but doesn't carry status info */
827 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
828 !(info->flags & IEEE80211_TX_STAT_AMPDU))
829 return;
830
831 /*
832 * Ignore this Tx frame response if its initial rate doesn't match
833 * that of latest Link Quality command. There may be stragglers
834 * from a previous Link Quality command, but we're no longer interested
835 * in those; they're either from the "active" mode while we're trying
836 * to check "search" mode, or a prior "search" mode after we've moved
837 * to a new "search" mode (which might become the new "active" mode).
838 */
839 table = &lq_sta->lq;
840 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
841 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
842 if (priv->band == IEEE80211_BAND_5GHZ)
843 rs_index -= IWL_FIRST_OFDM_RATE;
844 mac_flags = info->status.rates[0].flags;
845 mac_index = info->status.rates[0].idx;
846 /* For HT packets, map MCS to PLCP */
847 if (mac_flags & IEEE80211_TX_RC_MCS) {
848 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
849 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
850 mac_index++;
851 /*
852 * mac80211 HT index is always zero-indexed; we need to move
853 * HT OFDM rates after CCK rates in 2.4 GHz band
854 */
855 if (priv->band == IEEE80211_BAND_2GHZ)
856 mac_index += IWL_FIRST_OFDM_RATE;
857 }
858 /* Here we actually compare this rate to the latest LQ command */
859 if ((mac_index < 0) ||
860 (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
861 (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
862 (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
863 (tbl_type.ant_type != info->antenna_sel_tx) ||
864 (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
865 (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
866 (rs_index != mac_index)) {
867 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate);
868 /*
869 * Since rates mis-match, the last LQ command may have failed.
870 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
871 * ... driver.
872 */
873 lq_sta->missed_rate_counter++;
874 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
875 lq_sta->missed_rate_counter = 0;
876 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
877 }
878 /* Regardless, ignore this status info for outdated rate */
879 return;
880 } else
881 /* Rate did match, so reset the missed_rate_counter */
882 lq_sta->missed_rate_counter = 0;
883
884 /* Figure out if rate scale algorithm is in active or search table */
885 if (table_type_matches(&tbl_type,
886 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
887 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
888 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
889 } else if (table_type_matches(&tbl_type,
890 &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
891 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
892 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
893 } else {
894 IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n");
895 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
896 IWL_DEBUG_RATE(priv, "active- lq:%x, ant:%x, SGI:%d\n",
897 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
898 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
899 IWL_DEBUG_RATE(priv, "search- lq:%x, ant:%x, SGI:%d\n",
900 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
901 IWL_DEBUG_RATE(priv, "actual- lq:%x, ant:%x, SGI:%d\n",
902 tbl_type.lq_type, tbl_type.ant_type, tbl_type.is_SGI);
903 /*
904 * no matching table found, let's by-pass the data collection
905 * and continue to perform rate scale to find the rate table
906 */
907 rs_stay_in_table(lq_sta, true);
908 goto done;
909 }
910
911 /*
912 * Updating the frame history depends on whether packets were
913 * aggregated.
914 *
915 * For aggregation, all packets were transmitted at the same rate, the
916 * first index into rate scale table.
917 */
918 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
919 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
920 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
921 &rs_index);
922 rs_collect_tx_data(curr_tbl, rs_index,
923 info->status.ampdu_len,
924 info->status.ampdu_ack_len);
925
926 /* Update success/fail counts if not searching for new mode */
927 if (lq_sta->stay_in_tbl) {
928 lq_sta->total_success += info->status.ampdu_ack_len;
929 lq_sta->total_failed += (info->status.ampdu_len -
930 info->status.ampdu_ack_len);
931 }
932 } else {
933 /*
934 * For legacy, update frame history with for each Tx retry.
935 */
936 retries = info->status.rates[0].count - 1;
937 /* HW doesn't send more than 15 retries */
938 retries = min(retries, 15);
939
940 /* The last transmission may have been successful */
941 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
942 /* Collect data for each rate used during failed TX attempts */
943 for (i = 0; i <= retries; ++i) {
944 tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
945 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
946 &tbl_type, &rs_index);
947 /*
948 * Only collect stats if retried rate is in the same RS
949 * table as active/search.
950 */
951 if (table_type_matches(&tbl_type, curr_tbl))
952 tmp_tbl = curr_tbl;
953 else if (table_type_matches(&tbl_type, other_tbl))
954 tmp_tbl = other_tbl;
955 else
956 continue;
957 rs_collect_tx_data(tmp_tbl, rs_index, 1,
958 i < retries ? 0 : legacy_success);
959 }
960
961 /* Update success/fail counts if not searching for new mode */
962 if (lq_sta->stay_in_tbl) {
963 lq_sta->total_success += legacy_success;
964 lq_sta->total_failed += retries + (1 - legacy_success);
965 }
966 }
967 /* The last TX rate is cached in lq_sta; it's set in if/else above */
968 lq_sta->last_rate_n_flags = tx_rate;
969 done:
970 /* See if there's a better rate or modulation mode to try. */
971 if (sta && sta->supp_rates[sband->band])
972 rs_rate_scale_perform(priv, skb, sta, lq_sta);
973
974 /* Is there a need to switch between full concurrency and 3-wire? */
975 if (priv->bt_ant_couple_ok)
976 rs_bt_update_lq(priv, ctx, lq_sta);
977 }
978
979 /*
980 * Begin a period of staying with a selected modulation mode.
981 * Set "stay_in_tbl" flag to prevent any mode switches.
982 * Set frame tx success limits according to legacy vs. high-throughput,
983 * and reset overall (spanning all rates) tx success history statistics.
984 * These control how long we stay using same modulation mode before
985 * searching for a new mode.
986 */
987 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
988 struct iwl_lq_sta *lq_sta)
989 {
990 IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
991 lq_sta->stay_in_tbl = 1; /* only place this gets set */
992 if (is_legacy) {
993 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
994 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
995 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
996 } else {
997 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
998 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
999 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1000 }
1001 lq_sta->table_count = 0;
1002 lq_sta->total_failed = 0;
1003 lq_sta->total_success = 0;
1004 lq_sta->flush_timer = jiffies;
1005 lq_sta->action_counter = 0;
1006 }
1007
1008 /*
1009 * Find correct throughput table for given mode of modulation
1010 */
1011 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1012 struct iwl_scale_tbl_info *tbl)
1013 {
1014 /* Used to choose among HT tables */
1015 s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1016
1017 /* Check for invalid LQ type */
1018 if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1019 tbl->expected_tpt = expected_tpt_legacy;
1020 return;
1021 }
1022
1023 /* Legacy rates have only one table */
1024 if (is_legacy(tbl->lq_type)) {
1025 tbl->expected_tpt = expected_tpt_legacy;
1026 return;
1027 }
1028
1029 /* Choose among many HT tables depending on number of streams
1030 * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
1031 * status */
1032 if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1033 ht_tbl_pointer = expected_tpt_siso20MHz;
1034 else if (is_siso(tbl->lq_type))
1035 ht_tbl_pointer = expected_tpt_siso40MHz;
1036 else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1037 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1038 else if (is_mimo2(tbl->lq_type))
1039 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1040 else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1041 ht_tbl_pointer = expected_tpt_mimo3_20MHz;
1042 else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
1043 ht_tbl_pointer = expected_tpt_mimo3_40MHz;
1044
1045 if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */
1046 tbl->expected_tpt = ht_tbl_pointer[0];
1047 else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */
1048 tbl->expected_tpt = ht_tbl_pointer[1];
1049 else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */
1050 tbl->expected_tpt = ht_tbl_pointer[2];
1051 else /* AGG+SGI */
1052 tbl->expected_tpt = ht_tbl_pointer[3];
1053 }
1054
1055 /*
1056 * Find starting rate for new "search" high-throughput mode of modulation.
1057 * Goal is to find lowest expected rate (under perfect conditions) that is
1058 * above the current measured throughput of "active" mode, to give new mode
1059 * a fair chance to prove itself without too many challenges.
1060 *
1061 * This gets called when transitioning to more aggressive modulation
1062 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1063 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1064 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1065 * bit rate will typically need to increase, but not if performance was bad.
1066 */
1067 static s32 rs_get_best_rate(struct iwl_priv *priv,
1068 struct iwl_lq_sta *lq_sta,
1069 struct iwl_scale_tbl_info *tbl, /* "search" */
1070 u16 rate_mask, s8 index)
1071 {
1072 /* "active" values */
1073 struct iwl_scale_tbl_info *active_tbl =
1074 &(lq_sta->lq_info[lq_sta->active_tbl]);
1075 s32 active_sr = active_tbl->win[index].success_ratio;
1076 s32 active_tpt = active_tbl->expected_tpt[index];
1077
1078 /* expected "search" throughput */
1079 s32 *tpt_tbl = tbl->expected_tpt;
1080
1081 s32 new_rate, high, low, start_hi;
1082 u16 high_low;
1083 s8 rate = index;
1084
1085 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1086
1087 for (; ;) {
1088 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1089 tbl->lq_type);
1090
1091 low = high_low & 0xff;
1092 high = (high_low >> 8) & 0xff;
1093
1094 /*
1095 * Lower the "search" bit rate, to give new "search" mode
1096 * approximately the same throughput as "active" if:
1097 *
1098 * 1) "Active" mode has been working modestly well (but not
1099 * great), and expected "search" throughput (under perfect
1100 * conditions) at candidate rate is above the actual
1101 * measured "active" throughput (but less than expected
1102 * "active" throughput under perfect conditions).
1103 * OR
1104 * 2) "Active" mode has been working perfectly or very well
1105 * and expected "search" throughput (under perfect
1106 * conditions) at candidate rate is above expected
1107 * "active" throughput (under perfect conditions).
1108 */
1109 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1110 ((active_sr > IWL_RATE_DECREASE_TH) &&
1111 (active_sr <= IWL_RATE_HIGH_TH) &&
1112 (tpt_tbl[rate] <= active_tpt))) ||
1113 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1114 (tpt_tbl[rate] > active_tpt))) {
1115
1116 /* (2nd or later pass)
1117 * If we've already tried to raise the rate, and are
1118 * now trying to lower it, use the higher rate. */
1119 if (start_hi != IWL_RATE_INVALID) {
1120 new_rate = start_hi;
1121 break;
1122 }
1123
1124 new_rate = rate;
1125
1126 /* Loop again with lower rate */
1127 if (low != IWL_RATE_INVALID)
1128 rate = low;
1129
1130 /* Lower rate not available, use the original */
1131 else
1132 break;
1133
1134 /* Else try to raise the "search" rate to match "active" */
1135 } else {
1136 /* (2nd or later pass)
1137 * If we've already tried to lower the rate, and are
1138 * now trying to raise it, use the lower rate. */
1139 if (new_rate != IWL_RATE_INVALID)
1140 break;
1141
1142 /* Loop again with higher rate */
1143 else if (high != IWL_RATE_INVALID) {
1144 start_hi = high;
1145 rate = high;
1146
1147 /* Higher rate not available, use the original */
1148 } else {
1149 new_rate = rate;
1150 break;
1151 }
1152 }
1153 }
1154
1155 return new_rate;
1156 }
1157
1158 /*
1159 * Set up search table for MIMO2
1160 */
1161 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1162 struct iwl_lq_sta *lq_sta,
1163 struct ieee80211_conf *conf,
1164 struct ieee80211_sta *sta,
1165 struct iwl_scale_tbl_info *tbl, int index)
1166 {
1167 u16 rate_mask;
1168 s32 rate;
1169 s8 is_green = lq_sta->is_green;
1170 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1171 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1172
1173 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1174 return -1;
1175
1176 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1177 == WLAN_HT_CAP_SM_PS_STATIC)
1178 return -1;
1179
1180 /* Need both Tx chains/antennas to support MIMO */
1181 if (priv->hw_params.tx_chains_num < 2)
1182 return -1;
1183
1184 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1185
1186 tbl->lq_type = LQ_MIMO2;
1187 tbl->is_dup = lq_sta->is_dup;
1188 tbl->action = 0;
1189 tbl->max_search = IWL_MAX_SEARCH;
1190 rate_mask = lq_sta->active_mimo2_rate;
1191
1192 if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1193 tbl->is_ht40 = 1;
1194 else
1195 tbl->is_ht40 = 0;
1196
1197 rs_set_expected_tpt_table(lq_sta, tbl);
1198
1199 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1200
1201 IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1202 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1203 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1204 rate, rate_mask);
1205 return -1;
1206 }
1207 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1208
1209 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1210 tbl->current_rate, is_green);
1211 return 0;
1212 }
1213
1214 /*
1215 * Set up search table for MIMO3
1216 */
1217 static int rs_switch_to_mimo3(struct iwl_priv *priv,
1218 struct iwl_lq_sta *lq_sta,
1219 struct ieee80211_conf *conf,
1220 struct ieee80211_sta *sta,
1221 struct iwl_scale_tbl_info *tbl, int index)
1222 {
1223 u16 rate_mask;
1224 s32 rate;
1225 s8 is_green = lq_sta->is_green;
1226 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1227 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1228
1229 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1230 return -1;
1231
1232 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1233 == WLAN_HT_CAP_SM_PS_STATIC)
1234 return -1;
1235
1236 /* Need both Tx chains/antennas to support MIMO */
1237 if (priv->hw_params.tx_chains_num < 3)
1238 return -1;
1239
1240 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1241
1242 tbl->lq_type = LQ_MIMO3;
1243 tbl->is_dup = lq_sta->is_dup;
1244 tbl->action = 0;
1245 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1246 rate_mask = lq_sta->active_mimo3_rate;
1247
1248 if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1249 tbl->is_ht40 = 1;
1250 else
1251 tbl->is_ht40 = 0;
1252
1253 rs_set_expected_tpt_table(lq_sta, tbl);
1254
1255 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1256
1257 IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1258 rate, rate_mask);
1259 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1260 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1261 rate, rate_mask);
1262 return -1;
1263 }
1264 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1265
1266 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1267 tbl->current_rate, is_green);
1268 return 0;
1269 }
1270
1271 /*
1272 * Set up search table for SISO
1273 */
1274 static int rs_switch_to_siso(struct iwl_priv *priv,
1275 struct iwl_lq_sta *lq_sta,
1276 struct ieee80211_conf *conf,
1277 struct ieee80211_sta *sta,
1278 struct iwl_scale_tbl_info *tbl, int index)
1279 {
1280 u16 rate_mask;
1281 u8 is_green = lq_sta->is_green;
1282 s32 rate;
1283 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1284 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1285
1286 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1287 return -1;
1288
1289 IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1290
1291 tbl->is_dup = lq_sta->is_dup;
1292 tbl->lq_type = LQ_SISO;
1293 tbl->action = 0;
1294 tbl->max_search = IWL_MAX_SEARCH;
1295 rate_mask = lq_sta->active_siso_rate;
1296
1297 if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1298 tbl->is_ht40 = 1;
1299 else
1300 tbl->is_ht40 = 0;
1301
1302 if (is_green)
1303 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1304
1305 rs_set_expected_tpt_table(lq_sta, tbl);
1306 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1307
1308 IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1309 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1310 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1311 rate, rate_mask);
1312 return -1;
1313 }
1314 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1315 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1316 tbl->current_rate, is_green);
1317 return 0;
1318 }
1319
1320 /*
1321 * Try to switch to new modulation mode from legacy
1322 */
1323 static int rs_move_legacy_other(struct iwl_priv *priv,
1324 struct iwl_lq_sta *lq_sta,
1325 struct ieee80211_conf *conf,
1326 struct ieee80211_sta *sta,
1327 int index)
1328 {
1329 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1330 struct iwl_scale_tbl_info *search_tbl =
1331 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1332 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1333 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1334 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1335 u8 start_action;
1336 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1337 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1338 int ret = 0;
1339 u8 update_search_tbl_counter = 0;
1340
1341 switch (priv->bt_traffic_load) {
1342 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1343 /* nothing */
1344 break;
1345 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1346 /* avoid antenna B unless MIMO */
1347 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1348 if (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2)
1349 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1350 break;
1351 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1352 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1353 /* avoid antenna B and MIMO */
1354 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1355 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2 &&
1356 tbl->action != IWL_LEGACY_SWITCH_SISO)
1357 tbl->action = IWL_LEGACY_SWITCH_SISO;
1358 break;
1359 default:
1360 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1361 break;
1362 }
1363
1364 if (!iwl_ht_enabled(priv))
1365 /* stay in Legacy */
1366 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1367 else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1368 tbl->action > IWL_LEGACY_SWITCH_SISO)
1369 tbl->action = IWL_LEGACY_SWITCH_SISO;
1370
1371 /* configure as 1x1 if bt full concurrency */
1372 if (priv->bt_full_concurrent) {
1373 if (!iwl_ht_enabled(priv))
1374 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1375 else if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1376 tbl->action = IWL_LEGACY_SWITCH_SISO;
1377 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1378 }
1379
1380 start_action = tbl->action;
1381 for (; ;) {
1382 lq_sta->action_counter++;
1383 switch (tbl->action) {
1384 case IWL_LEGACY_SWITCH_ANTENNA1:
1385 case IWL_LEGACY_SWITCH_ANTENNA2:
1386 IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1387
1388 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1389 tx_chains_num <= 1) ||
1390 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1391 tx_chains_num <= 2))
1392 break;
1393
1394 /* Don't change antenna if success has been great */
1395 if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1396 !priv->bt_full_concurrent &&
1397 priv->bt_traffic_load ==
1398 IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1399 break;
1400
1401 /* Set up search table to try other antenna */
1402 memcpy(search_tbl, tbl, sz);
1403
1404 if (rs_toggle_antenna(valid_tx_ant,
1405 &search_tbl->current_rate, search_tbl)) {
1406 update_search_tbl_counter = 1;
1407 rs_set_expected_tpt_table(lq_sta, search_tbl);
1408 goto out;
1409 }
1410 break;
1411 case IWL_LEGACY_SWITCH_SISO:
1412 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1413
1414 /* Set up search table to try SISO */
1415 memcpy(search_tbl, tbl, sz);
1416 search_tbl->is_SGI = 0;
1417 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1418 search_tbl, index);
1419 if (!ret) {
1420 lq_sta->action_counter = 0;
1421 goto out;
1422 }
1423
1424 break;
1425 case IWL_LEGACY_SWITCH_MIMO2_AB:
1426 case IWL_LEGACY_SWITCH_MIMO2_AC:
1427 case IWL_LEGACY_SWITCH_MIMO2_BC:
1428 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1429
1430 /* Set up search table to try MIMO */
1431 memcpy(search_tbl, tbl, sz);
1432 search_tbl->is_SGI = 0;
1433
1434 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1435 search_tbl->ant_type = ANT_AB;
1436 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1437 search_tbl->ant_type = ANT_AC;
1438 else
1439 search_tbl->ant_type = ANT_BC;
1440
1441 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1442 break;
1443
1444 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1445 search_tbl, index);
1446 if (!ret) {
1447 lq_sta->action_counter = 0;
1448 goto out;
1449 }
1450 break;
1451
1452 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1453 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1454
1455 /* Set up search table to try MIMO3 */
1456 memcpy(search_tbl, tbl, sz);
1457 search_tbl->is_SGI = 0;
1458
1459 search_tbl->ant_type = ANT_ABC;
1460
1461 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1462 break;
1463
1464 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1465 search_tbl, index);
1466 if (!ret) {
1467 lq_sta->action_counter = 0;
1468 goto out;
1469 }
1470 break;
1471 }
1472 tbl->action++;
1473 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1474 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1475
1476 if (tbl->action == start_action)
1477 break;
1478
1479 }
1480 search_tbl->lq_type = LQ_NONE;
1481 return 0;
1482
1483 out:
1484 lq_sta->search_better_tbl = 1;
1485 tbl->action++;
1486 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1487 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1488 if (update_search_tbl_counter)
1489 search_tbl->action = tbl->action;
1490 return 0;
1491
1492 }
1493
1494 /*
1495 * Try to switch to new modulation mode from SISO
1496 */
1497 static int rs_move_siso_to_other(struct iwl_priv *priv,
1498 struct iwl_lq_sta *lq_sta,
1499 struct ieee80211_conf *conf,
1500 struct ieee80211_sta *sta, int index)
1501 {
1502 u8 is_green = lq_sta->is_green;
1503 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1504 struct iwl_scale_tbl_info *search_tbl =
1505 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1506 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1507 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1508 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1509 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1510 u8 start_action;
1511 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1512 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1513 u8 update_search_tbl_counter = 0;
1514 int ret;
1515
1516 switch (priv->bt_traffic_load) {
1517 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1518 /* nothing */
1519 break;
1520 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1521 /* avoid antenna B unless MIMO */
1522 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1523 if (tbl->action == IWL_SISO_SWITCH_ANTENNA2)
1524 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1525 break;
1526 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1527 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1528 /* avoid antenna B and MIMO */
1529 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1530 if (tbl->action != IWL_SISO_SWITCH_ANTENNA1)
1531 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1532 break;
1533 default:
1534 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1535 break;
1536 }
1537
1538 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1539 tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1540 /* stay in SISO */
1541 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1542 }
1543
1544 /* configure as 1x1 if bt full concurrency */
1545 if (priv->bt_full_concurrent) {
1546 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1547 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1548 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1549 }
1550
1551 start_action = tbl->action;
1552 for (;;) {
1553 lq_sta->action_counter++;
1554 switch (tbl->action) {
1555 case IWL_SISO_SWITCH_ANTENNA1:
1556 case IWL_SISO_SWITCH_ANTENNA2:
1557 IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1558 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1559 tx_chains_num <= 1) ||
1560 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1561 tx_chains_num <= 2))
1562 break;
1563
1564 if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1565 !priv->bt_full_concurrent &&
1566 priv->bt_traffic_load ==
1567 IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1568 break;
1569
1570 memcpy(search_tbl, tbl, sz);
1571 if (rs_toggle_antenna(valid_tx_ant,
1572 &search_tbl->current_rate, search_tbl)) {
1573 update_search_tbl_counter = 1;
1574 goto out;
1575 }
1576 break;
1577 case IWL_SISO_SWITCH_MIMO2_AB:
1578 case IWL_SISO_SWITCH_MIMO2_AC:
1579 case IWL_SISO_SWITCH_MIMO2_BC:
1580 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1581 memcpy(search_tbl, tbl, sz);
1582 search_tbl->is_SGI = 0;
1583
1584 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1585 search_tbl->ant_type = ANT_AB;
1586 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1587 search_tbl->ant_type = ANT_AC;
1588 else
1589 search_tbl->ant_type = ANT_BC;
1590
1591 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1592 break;
1593
1594 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1595 search_tbl, index);
1596 if (!ret)
1597 goto out;
1598 break;
1599 case IWL_SISO_SWITCH_GI:
1600 if (!tbl->is_ht40 && !(ht_cap->cap &
1601 IEEE80211_HT_CAP_SGI_20))
1602 break;
1603 if (tbl->is_ht40 && !(ht_cap->cap &
1604 IEEE80211_HT_CAP_SGI_40))
1605 break;
1606
1607 IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1608
1609 memcpy(search_tbl, tbl, sz);
1610 if (is_green) {
1611 if (!tbl->is_SGI)
1612 break;
1613 else
1614 IWL_ERR(priv,
1615 "SGI was set in GF+SISO\n");
1616 }
1617 search_tbl->is_SGI = !tbl->is_SGI;
1618 rs_set_expected_tpt_table(lq_sta, search_tbl);
1619 if (tbl->is_SGI) {
1620 s32 tpt = lq_sta->last_tpt / 100;
1621 if (tpt >= search_tbl->expected_tpt[index])
1622 break;
1623 }
1624 search_tbl->current_rate =
1625 rate_n_flags_from_tbl(priv, search_tbl,
1626 index, is_green);
1627 update_search_tbl_counter = 1;
1628 goto out;
1629 case IWL_SISO_SWITCH_MIMO3_ABC:
1630 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1631 memcpy(search_tbl, tbl, sz);
1632 search_tbl->is_SGI = 0;
1633 search_tbl->ant_type = ANT_ABC;
1634
1635 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1636 break;
1637
1638 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1639 search_tbl, index);
1640 if (!ret)
1641 goto out;
1642 break;
1643 }
1644 tbl->action++;
1645 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1646 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1647
1648 if (tbl->action == start_action)
1649 break;
1650 }
1651 search_tbl->lq_type = LQ_NONE;
1652 return 0;
1653
1654 out:
1655 lq_sta->search_better_tbl = 1;
1656 tbl->action++;
1657 if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1658 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1659 if (update_search_tbl_counter)
1660 search_tbl->action = tbl->action;
1661
1662 return 0;
1663 }
1664
1665 /*
1666 * Try to switch to new modulation mode from MIMO2
1667 */
1668 static int rs_move_mimo2_to_other(struct iwl_priv *priv,
1669 struct iwl_lq_sta *lq_sta,
1670 struct ieee80211_conf *conf,
1671 struct ieee80211_sta *sta, int index)
1672 {
1673 s8 is_green = lq_sta->is_green;
1674 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1675 struct iwl_scale_tbl_info *search_tbl =
1676 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1677 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1678 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1679 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1680 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1681 u8 start_action;
1682 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1683 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1684 u8 update_search_tbl_counter = 0;
1685 int ret;
1686
1687 switch (priv->bt_traffic_load) {
1688 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1689 /* nothing */
1690 break;
1691 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1692 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1693 /* avoid antenna B and MIMO */
1694 if (tbl->action != IWL_MIMO2_SWITCH_SISO_A)
1695 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1696 break;
1697 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1698 /* avoid antenna B unless MIMO */
1699 if (tbl->action == IWL_MIMO2_SWITCH_SISO_B ||
1700 tbl->action == IWL_MIMO2_SWITCH_SISO_C)
1701 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1702 break;
1703 default:
1704 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1705 break;
1706 }
1707
1708 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1709 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1710 tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1711 /* switch in SISO */
1712 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1713 }
1714
1715 /* configure as 1x1 if bt full concurrency */
1716 if (priv->bt_full_concurrent &&
1717 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1718 tbl->action > IWL_MIMO2_SWITCH_SISO_C))
1719 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1720
1721 start_action = tbl->action;
1722 for (;;) {
1723 lq_sta->action_counter++;
1724 switch (tbl->action) {
1725 case IWL_MIMO2_SWITCH_ANTENNA1:
1726 case IWL_MIMO2_SWITCH_ANTENNA2:
1727 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1728
1729 if (tx_chains_num <= 2)
1730 break;
1731
1732 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1733 break;
1734
1735 memcpy(search_tbl, tbl, sz);
1736 if (rs_toggle_antenna(valid_tx_ant,
1737 &search_tbl->current_rate, search_tbl)) {
1738 update_search_tbl_counter = 1;
1739 goto out;
1740 }
1741 break;
1742 case IWL_MIMO2_SWITCH_SISO_A:
1743 case IWL_MIMO2_SWITCH_SISO_B:
1744 case IWL_MIMO2_SWITCH_SISO_C:
1745 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1746
1747 /* Set up new search table for SISO */
1748 memcpy(search_tbl, tbl, sz);
1749
1750 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1751 search_tbl->ant_type = ANT_A;
1752 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1753 search_tbl->ant_type = ANT_B;
1754 else
1755 search_tbl->ant_type = ANT_C;
1756
1757 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1758 break;
1759
1760 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1761 search_tbl, index);
1762 if (!ret)
1763 goto out;
1764
1765 break;
1766
1767 case IWL_MIMO2_SWITCH_GI:
1768 if (!tbl->is_ht40 && !(ht_cap->cap &
1769 IEEE80211_HT_CAP_SGI_20))
1770 break;
1771 if (tbl->is_ht40 && !(ht_cap->cap &
1772 IEEE80211_HT_CAP_SGI_40))
1773 break;
1774
1775 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1776
1777 /* Set up new search table for MIMO2 */
1778 memcpy(search_tbl, tbl, sz);
1779 search_tbl->is_SGI = !tbl->is_SGI;
1780 rs_set_expected_tpt_table(lq_sta, search_tbl);
1781 /*
1782 * If active table already uses the fastest possible
1783 * modulation (dual stream with short guard interval),
1784 * and it's working well, there's no need to look
1785 * for a better type of modulation!
1786 */
1787 if (tbl->is_SGI) {
1788 s32 tpt = lq_sta->last_tpt / 100;
1789 if (tpt >= search_tbl->expected_tpt[index])
1790 break;
1791 }
1792 search_tbl->current_rate =
1793 rate_n_flags_from_tbl(priv, search_tbl,
1794 index, is_green);
1795 update_search_tbl_counter = 1;
1796 goto out;
1797
1798 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1799 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1800 memcpy(search_tbl, tbl, sz);
1801 search_tbl->is_SGI = 0;
1802 search_tbl->ant_type = ANT_ABC;
1803
1804 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1805 break;
1806
1807 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1808 search_tbl, index);
1809 if (!ret)
1810 goto out;
1811
1812 break;
1813 }
1814 tbl->action++;
1815 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1816 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1817
1818 if (tbl->action == start_action)
1819 break;
1820 }
1821 search_tbl->lq_type = LQ_NONE;
1822 return 0;
1823 out:
1824 lq_sta->search_better_tbl = 1;
1825 tbl->action++;
1826 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1827 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1828 if (update_search_tbl_counter)
1829 search_tbl->action = tbl->action;
1830
1831 return 0;
1832
1833 }
1834
1835 /*
1836 * Try to switch to new modulation mode from MIMO3
1837 */
1838 static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1839 struct iwl_lq_sta *lq_sta,
1840 struct ieee80211_conf *conf,
1841 struct ieee80211_sta *sta, int index)
1842 {
1843 s8 is_green = lq_sta->is_green;
1844 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1845 struct iwl_scale_tbl_info *search_tbl =
1846 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1847 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1848 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1849 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1850 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1851 u8 start_action;
1852 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1853 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1854 int ret;
1855 u8 update_search_tbl_counter = 0;
1856
1857 switch (priv->bt_traffic_load) {
1858 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1859 /* nothing */
1860 break;
1861 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1862 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1863 /* avoid antenna B and MIMO */
1864 if (tbl->action != IWL_MIMO3_SWITCH_SISO_A)
1865 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1866 break;
1867 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1868 /* avoid antenna B unless MIMO */
1869 if (tbl->action == IWL_MIMO3_SWITCH_SISO_B ||
1870 tbl->action == IWL_MIMO3_SWITCH_SISO_C)
1871 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1872 break;
1873 default:
1874 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1875 break;
1876 }
1877
1878 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1879 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1880 tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1881 /* switch in SISO */
1882 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1883 }
1884
1885 /* configure as 1x1 if bt full concurrency */
1886 if (priv->bt_full_concurrent &&
1887 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1888 tbl->action > IWL_MIMO3_SWITCH_SISO_C))
1889 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1890
1891 start_action = tbl->action;
1892 for (;;) {
1893 lq_sta->action_counter++;
1894 switch (tbl->action) {
1895 case IWL_MIMO3_SWITCH_ANTENNA1:
1896 case IWL_MIMO3_SWITCH_ANTENNA2:
1897 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
1898
1899 if (tx_chains_num <= 3)
1900 break;
1901
1902 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1903 break;
1904
1905 memcpy(search_tbl, tbl, sz);
1906 if (rs_toggle_antenna(valid_tx_ant,
1907 &search_tbl->current_rate, search_tbl))
1908 goto out;
1909 break;
1910 case IWL_MIMO3_SWITCH_SISO_A:
1911 case IWL_MIMO3_SWITCH_SISO_B:
1912 case IWL_MIMO3_SWITCH_SISO_C:
1913 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
1914
1915 /* Set up new search table for SISO */
1916 memcpy(search_tbl, tbl, sz);
1917
1918 if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
1919 search_tbl->ant_type = ANT_A;
1920 else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
1921 search_tbl->ant_type = ANT_B;
1922 else
1923 search_tbl->ant_type = ANT_C;
1924
1925 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1926 break;
1927
1928 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1929 search_tbl, index);
1930 if (!ret)
1931 goto out;
1932
1933 break;
1934
1935 case IWL_MIMO3_SWITCH_MIMO2_AB:
1936 case IWL_MIMO3_SWITCH_MIMO2_AC:
1937 case IWL_MIMO3_SWITCH_MIMO2_BC:
1938 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
1939
1940 memcpy(search_tbl, tbl, sz);
1941 search_tbl->is_SGI = 0;
1942 if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
1943 search_tbl->ant_type = ANT_AB;
1944 else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
1945 search_tbl->ant_type = ANT_AC;
1946 else
1947 search_tbl->ant_type = ANT_BC;
1948
1949 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1950 break;
1951
1952 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1953 search_tbl, index);
1954 if (!ret)
1955 goto out;
1956
1957 break;
1958
1959 case IWL_MIMO3_SWITCH_GI:
1960 if (!tbl->is_ht40 && !(ht_cap->cap &
1961 IEEE80211_HT_CAP_SGI_20))
1962 break;
1963 if (tbl->is_ht40 && !(ht_cap->cap &
1964 IEEE80211_HT_CAP_SGI_40))
1965 break;
1966
1967 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
1968
1969 /* Set up new search table for MIMO */
1970 memcpy(search_tbl, tbl, sz);
1971 search_tbl->is_SGI = !tbl->is_SGI;
1972 rs_set_expected_tpt_table(lq_sta, search_tbl);
1973 /*
1974 * If active table already uses the fastest possible
1975 * modulation (dual stream with short guard interval),
1976 * and it's working well, there's no need to look
1977 * for a better type of modulation!
1978 */
1979 if (tbl->is_SGI) {
1980 s32 tpt = lq_sta->last_tpt / 100;
1981 if (tpt >= search_tbl->expected_tpt[index])
1982 break;
1983 }
1984 search_tbl->current_rate =
1985 rate_n_flags_from_tbl(priv, search_tbl,
1986 index, is_green);
1987 update_search_tbl_counter = 1;
1988 goto out;
1989 }
1990 tbl->action++;
1991 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1992 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1993
1994 if (tbl->action == start_action)
1995 break;
1996 }
1997 search_tbl->lq_type = LQ_NONE;
1998 return 0;
1999 out:
2000 lq_sta->search_better_tbl = 1;
2001 tbl->action++;
2002 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2003 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2004 if (update_search_tbl_counter)
2005 search_tbl->action = tbl->action;
2006
2007 return 0;
2008
2009 }
2010
2011 /*
2012 * Check whether we should continue using same modulation mode, or
2013 * begin search for a new mode, based on:
2014 * 1) # tx successes or failures while using this mode
2015 * 2) # times calling this function
2016 * 3) elapsed time in this mode (not used, for now)
2017 */
2018 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
2019 {
2020 struct iwl_scale_tbl_info *tbl;
2021 int i;
2022 int active_tbl;
2023 int flush_interval_passed = 0;
2024 struct iwl_priv *priv;
2025
2026 priv = lq_sta->drv;
2027 active_tbl = lq_sta->active_tbl;
2028
2029 tbl = &(lq_sta->lq_info[active_tbl]);
2030
2031 /* If we've been disallowing search, see if we should now allow it */
2032 if (lq_sta->stay_in_tbl) {
2033
2034 /* Elapsed time using current modulation mode */
2035 if (lq_sta->flush_timer)
2036 flush_interval_passed =
2037 time_after(jiffies,
2038 (unsigned long)(lq_sta->flush_timer +
2039 IWL_RATE_SCALE_FLUSH_INTVL));
2040
2041 /*
2042 * Check if we should allow search for new modulation mode.
2043 * If many frames have failed or succeeded, or we've used
2044 * this same modulation for a long time, allow search, and
2045 * reset history stats that keep track of whether we should
2046 * allow a new search. Also (below) reset all bitmaps and
2047 * stats in active history.
2048 */
2049 if (force_search ||
2050 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
2051 (lq_sta->total_success > lq_sta->max_success_limit) ||
2052 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
2053 && (flush_interval_passed))) {
2054 IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n:",
2055 lq_sta->total_failed,
2056 lq_sta->total_success,
2057 flush_interval_passed);
2058
2059 /* Allow search for new mode */
2060 lq_sta->stay_in_tbl = 0; /* only place reset */
2061 lq_sta->total_failed = 0;
2062 lq_sta->total_success = 0;
2063 lq_sta->flush_timer = 0;
2064
2065 /*
2066 * Else if we've used this modulation mode enough repetitions
2067 * (regardless of elapsed time or success/failure), reset
2068 * history bitmaps and rate-specific stats for all rates in
2069 * active table.
2070 */
2071 } else {
2072 lq_sta->table_count++;
2073 if (lq_sta->table_count >=
2074 lq_sta->table_count_limit) {
2075 lq_sta->table_count = 0;
2076
2077 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
2078 for (i = 0; i < IWL_RATE_COUNT; i++)
2079 rs_rate_scale_clear_window(
2080 &(tbl->win[i]));
2081 }
2082 }
2083
2084 /* If transitioning to allow "search", reset all history
2085 * bitmaps and stats in active table (this will become the new
2086 * "search" table). */
2087 if (!lq_sta->stay_in_tbl) {
2088 for (i = 0; i < IWL_RATE_COUNT; i++)
2089 rs_rate_scale_clear_window(&(tbl->win[i]));
2090 }
2091 }
2092 }
2093
2094 /*
2095 * setup rate table in uCode
2096 * return rate_n_flags as used in the table
2097 */
2098 static u32 rs_update_rate_tbl(struct iwl_priv *priv,
2099 struct iwl_rxon_context *ctx,
2100 struct iwl_lq_sta *lq_sta,
2101 struct iwl_scale_tbl_info *tbl,
2102 int index, u8 is_green)
2103 {
2104 u32 rate;
2105
2106 /* Update uCode's rate table. */
2107 rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2108 rs_fill_link_cmd(priv, lq_sta, rate);
2109 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2110
2111 return rate;
2112 }
2113
2114 /*
2115 * Do rate scaling and search for new modulation mode.
2116 */
2117 static void rs_rate_scale_perform(struct iwl_priv *priv,
2118 struct sk_buff *skb,
2119 struct ieee80211_sta *sta,
2120 struct iwl_lq_sta *lq_sta)
2121 {
2122 struct ieee80211_hw *hw = priv->hw;
2123 struct ieee80211_conf *conf = &hw->conf;
2124 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2125 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2126 int low = IWL_RATE_INVALID;
2127 int high = IWL_RATE_INVALID;
2128 int index;
2129 int i;
2130 struct iwl_rate_scale_data *window = NULL;
2131 int current_tpt = IWL_INVALID_VALUE;
2132 int low_tpt = IWL_INVALID_VALUE;
2133 int high_tpt = IWL_INVALID_VALUE;
2134 u32 fail_count;
2135 s8 scale_action = 0;
2136 u16 rate_mask;
2137 u8 update_lq = 0;
2138 struct iwl_scale_tbl_info *tbl, *tbl1;
2139 u16 rate_scale_index_msk = 0;
2140 u32 rate;
2141 u8 is_green = 0;
2142 u8 active_tbl = 0;
2143 u8 done_search = 0;
2144 u16 high_low;
2145 s32 sr;
2146 u8 tid = MAX_TID_COUNT;
2147 struct iwl_tid_data *tid_data;
2148 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
2149 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
2150
2151 IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
2152
2153 /* Send management frames and NO_ACK data using lowest rate. */
2154 /* TODO: this could probably be improved.. */
2155 if (!ieee80211_is_data(hdr->frame_control) ||
2156 info->flags & IEEE80211_TX_CTL_NO_ACK)
2157 return;
2158
2159 if (!sta || !lq_sta)
2160 return;
2161
2162 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
2163
2164 tid = rs_tl_add_packet(lq_sta, hdr);
2165 if ((tid != MAX_TID_COUNT) && (lq_sta->tx_agg_tid_en & (1 << tid))) {
2166 tid_data = &priv->stations[lq_sta->lq.sta_id].tid[tid];
2167 if (tid_data->agg.state == IWL_AGG_OFF)
2168 lq_sta->is_agg = 0;
2169 else
2170 lq_sta->is_agg = 1;
2171 } else
2172 lq_sta->is_agg = 0;
2173
2174 /*
2175 * Select rate-scale / modulation-mode table to work with in
2176 * the rest of this function: "search" if searching for better
2177 * modulation mode, or "active" if doing rate scaling within a mode.
2178 */
2179 if (!lq_sta->search_better_tbl)
2180 active_tbl = lq_sta->active_tbl;
2181 else
2182 active_tbl = 1 - lq_sta->active_tbl;
2183
2184 tbl = &(lq_sta->lq_info[active_tbl]);
2185 if (is_legacy(tbl->lq_type))
2186 lq_sta->is_green = 0;
2187 else
2188 lq_sta->is_green = rs_use_green(sta);
2189 is_green = lq_sta->is_green;
2190
2191 /* current tx rate */
2192 index = lq_sta->last_txrate_idx;
2193
2194 IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2195 tbl->lq_type);
2196
2197 /* rates available for this association, and for modulation mode */
2198 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2199
2200 IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
2201
2202 /* mask with station rate restriction */
2203 if (is_legacy(tbl->lq_type)) {
2204 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2205 /* supp_rates has no CCK bits in A mode */
2206 rate_scale_index_msk = (u16) (rate_mask &
2207 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2208 else
2209 rate_scale_index_msk = (u16) (rate_mask &
2210 lq_sta->supp_rates);
2211
2212 } else
2213 rate_scale_index_msk = rate_mask;
2214
2215 if (!rate_scale_index_msk)
2216 rate_scale_index_msk = rate_mask;
2217
2218 if (!((1 << index) & rate_scale_index_msk)) {
2219 IWL_ERR(priv, "Current Rate is not valid\n");
2220 if (lq_sta->search_better_tbl) {
2221 /* revert to active table if search table is not valid*/
2222 tbl->lq_type = LQ_NONE;
2223 lq_sta->search_better_tbl = 0;
2224 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2225 /* get "active" rate info */
2226 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2227 rate = rs_update_rate_tbl(priv, ctx, lq_sta,
2228 tbl, index, is_green);
2229 }
2230 return;
2231 }
2232
2233 /* Get expected throughput table and history window for current rate */
2234 if (!tbl->expected_tpt) {
2235 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2236 return;
2237 }
2238
2239 /* force user max rate if set by user */
2240 if ((lq_sta->max_rate_idx != -1) &&
2241 (lq_sta->max_rate_idx < index)) {
2242 index = lq_sta->max_rate_idx;
2243 update_lq = 1;
2244 window = &(tbl->win[index]);
2245 goto lq_update;
2246 }
2247
2248 window = &(tbl->win[index]);
2249
2250 /*
2251 * If there is not enough history to calculate actual average
2252 * throughput, keep analyzing results of more tx frames, without
2253 * changing rate or mode (bypass most of the rest of this function).
2254 * Set up new rate table in uCode only if old rate is not supported
2255 * in current association (use new rate found above).
2256 */
2257 fail_count = window->counter - window->success_counter;
2258 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2259 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2260 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2261 "for index %d\n",
2262 window->success_counter, window->counter, index);
2263
2264 /* Can't calculate this yet; not enough history */
2265 window->average_tpt = IWL_INVALID_VALUE;
2266
2267 /* Should we stay with this modulation mode,
2268 * or search for a new one? */
2269 rs_stay_in_table(lq_sta, false);
2270
2271 goto out;
2272 }
2273 /* Else we have enough samples; calculate estimate of
2274 * actual average throughput */
2275 if (window->average_tpt != ((window->success_ratio *
2276 tbl->expected_tpt[index] + 64) / 128)) {
2277 IWL_ERR(priv, "expected_tpt should have been calculated by now\n");
2278 window->average_tpt = ((window->success_ratio *
2279 tbl->expected_tpt[index] + 64) / 128);
2280 }
2281
2282 /* If we are searching for better modulation mode, check success. */
2283 if (lq_sta->search_better_tbl &&
2284 (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
2285 /* If good success, continue using the "search" mode;
2286 * no need to send new link quality command, since we're
2287 * continuing to use the setup that we've been trying. */
2288 if (window->average_tpt > lq_sta->last_tpt) {
2289
2290 IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2291 "suc=%d cur-tpt=%d old-tpt=%d\n",
2292 window->success_ratio,
2293 window->average_tpt,
2294 lq_sta->last_tpt);
2295
2296 if (!is_legacy(tbl->lq_type))
2297 lq_sta->enable_counter = 1;
2298
2299 /* Swap tables; "search" becomes "active" */
2300 lq_sta->active_tbl = active_tbl;
2301 current_tpt = window->average_tpt;
2302
2303 /* Else poor success; go back to mode in "active" table */
2304 } else {
2305
2306 IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2307 "suc=%d cur-tpt=%d old-tpt=%d\n",
2308 window->success_ratio,
2309 window->average_tpt,
2310 lq_sta->last_tpt);
2311
2312 /* Nullify "search" table */
2313 tbl->lq_type = LQ_NONE;
2314
2315 /* Revert to "active" table */
2316 active_tbl = lq_sta->active_tbl;
2317 tbl = &(lq_sta->lq_info[active_tbl]);
2318
2319 /* Revert to "active" rate and throughput info */
2320 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2321 current_tpt = lq_sta->last_tpt;
2322
2323 /* Need to set up a new rate table in uCode */
2324 update_lq = 1;
2325 }
2326
2327 /* Either way, we've made a decision; modulation mode
2328 * search is done, allow rate adjustment next time. */
2329 lq_sta->search_better_tbl = 0;
2330 done_search = 1; /* Don't switch modes below! */
2331 goto lq_update;
2332 }
2333
2334 /* (Else) not in search of better modulation mode, try for better
2335 * starting rate, while staying in this mode. */
2336 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2337 tbl->lq_type);
2338 low = high_low & 0xff;
2339 high = (high_low >> 8) & 0xff;
2340
2341 /* If user set max rate, dont allow higher than user constrain */
2342 if ((lq_sta->max_rate_idx != -1) &&
2343 (lq_sta->max_rate_idx < high))
2344 high = IWL_RATE_INVALID;
2345
2346 sr = window->success_ratio;
2347
2348 /* Collect measured throughputs for current and adjacent rates */
2349 current_tpt = window->average_tpt;
2350 if (low != IWL_RATE_INVALID)
2351 low_tpt = tbl->win[low].average_tpt;
2352 if (high != IWL_RATE_INVALID)
2353 high_tpt = tbl->win[high].average_tpt;
2354
2355 scale_action = 0;
2356
2357 /* Too many failures, decrease rate */
2358 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2359 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2360 scale_action = -1;
2361
2362 /* No throughput measured yet for adjacent rates; try increase. */
2363 } else if ((low_tpt == IWL_INVALID_VALUE) &&
2364 (high_tpt == IWL_INVALID_VALUE)) {
2365
2366 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2367 scale_action = 1;
2368 else if (low != IWL_RATE_INVALID)
2369 scale_action = 0;
2370 }
2371
2372 /* Both adjacent throughputs are measured, but neither one has better
2373 * throughput; we're using the best rate, don't change it! */
2374 else if ((low_tpt != IWL_INVALID_VALUE) &&
2375 (high_tpt != IWL_INVALID_VALUE) &&
2376 (low_tpt < current_tpt) &&
2377 (high_tpt < current_tpt))
2378 scale_action = 0;
2379
2380 /* At least one adjacent rate's throughput is measured,
2381 * and may have better performance. */
2382 else {
2383 /* Higher adjacent rate's throughput is measured */
2384 if (high_tpt != IWL_INVALID_VALUE) {
2385 /* Higher rate has better throughput */
2386 if (high_tpt > current_tpt &&
2387 sr >= IWL_RATE_INCREASE_TH) {
2388 scale_action = 1;
2389 } else {
2390 scale_action = 0;
2391 }
2392
2393 /* Lower adjacent rate's throughput is measured */
2394 } else if (low_tpt != IWL_INVALID_VALUE) {
2395 /* Lower rate has better throughput */
2396 if (low_tpt > current_tpt) {
2397 IWL_DEBUG_RATE(priv,
2398 "decrease rate because of low tpt\n");
2399 scale_action = -1;
2400 } else if (sr >= IWL_RATE_INCREASE_TH) {
2401 scale_action = 1;
2402 }
2403 }
2404 }
2405
2406 /* Sanity check; asked for decrease, but success rate or throughput
2407 * has been good at old rate. Don't change it. */
2408 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2409 ((sr > IWL_RATE_HIGH_TH) ||
2410 (current_tpt > (100 * tbl->expected_tpt[low]))))
2411 scale_action = 0;
2412 if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2413 scale_action = -1;
2414 if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
2415 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2416 scale_action = -1;
2417
2418 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2419 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2420 if (lq_sta->last_bt_traffic > priv->bt_traffic_load) {
2421 /*
2422 * don't set scale_action, don't want to scale up if
2423 * the rate scale doesn't otherwise think that is a
2424 * good idea.
2425 */
2426 } else if (lq_sta->last_bt_traffic <= priv->bt_traffic_load) {
2427 scale_action = -1;
2428 }
2429 }
2430 lq_sta->last_bt_traffic = priv->bt_traffic_load;
2431
2432 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2433 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2434 /* search for a new modulation */
2435 rs_stay_in_table(lq_sta, true);
2436 goto lq_update;
2437 }
2438
2439 switch (scale_action) {
2440 case -1:
2441 /* Decrease starting rate, update uCode's rate table */
2442 if (low != IWL_RATE_INVALID) {
2443 update_lq = 1;
2444 index = low;
2445 }
2446
2447 break;
2448 case 1:
2449 /* Increase starting rate, update uCode's rate table */
2450 if (high != IWL_RATE_INVALID) {
2451 update_lq = 1;
2452 index = high;
2453 }
2454
2455 break;
2456 case 0:
2457 /* No change */
2458 default:
2459 break;
2460 }
2461
2462 IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2463 "high %d type %d\n",
2464 index, scale_action, low, high, tbl->lq_type);
2465
2466 lq_update:
2467 /* Replace uCode's rate table for the destination station. */
2468 if (update_lq)
2469 rate = rs_update_rate_tbl(priv, ctx, lq_sta,
2470 tbl, index, is_green);
2471
2472 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
2473 /* Should we stay with this modulation mode,
2474 * or search for a new one? */
2475 rs_stay_in_table(lq_sta, false);
2476 }
2477 /*
2478 * Search for new modulation mode if we're:
2479 * 1) Not changing rates right now
2480 * 2) Not just finishing up a search
2481 * 3) Allowing a new search
2482 */
2483 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2484 /* Save current throughput to compare with "search" throughput*/
2485 lq_sta->last_tpt = current_tpt;
2486
2487 /* Select a new "search" modulation mode to try.
2488 * If one is found, set up the new "search" table. */
2489 if (is_legacy(tbl->lq_type))
2490 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2491 else if (is_siso(tbl->lq_type))
2492 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2493 else if (is_mimo2(tbl->lq_type))
2494 rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2495 else
2496 rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2497
2498 /* If new "search" mode was selected, set up in uCode table */
2499 if (lq_sta->search_better_tbl) {
2500 /* Access the "search" table, clear its history. */
2501 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2502 for (i = 0; i < IWL_RATE_COUNT; i++)
2503 rs_rate_scale_clear_window(&(tbl->win[i]));
2504
2505 /* Use new "search" start rate */
2506 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2507
2508 IWL_DEBUG_RATE(priv, "Switch current mcs: %X index: %d\n",
2509 tbl->current_rate, index);
2510 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2511 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2512 } else
2513 done_search = 1;
2514 }
2515
2516 if (done_search && !lq_sta->stay_in_tbl) {
2517 /* If the "active" (non-search) mode was legacy,
2518 * and we've tried switching antennas,
2519 * but we haven't been able to try HT modes (not available),
2520 * stay with best antenna legacy modulation for a while
2521 * before next round of mode comparisons. */
2522 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2523 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2524 lq_sta->action_counter > tbl1->max_search) {
2525 IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2526 rs_set_stay_in_table(priv, 1, lq_sta);
2527 }
2528
2529 /* If we're in an HT mode, and all 3 mode switch actions
2530 * have been tried and compared, stay in this best modulation
2531 * mode for a while before next round of mode comparisons. */
2532 if (lq_sta->enable_counter &&
2533 (lq_sta->action_counter >= tbl1->max_search) &&
2534 iwl_ht_enabled(priv)) {
2535 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2536 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2537 (tid != MAX_TID_COUNT)) {
2538 tid_data =
2539 &priv->stations[lq_sta->lq.sta_id].tid[tid];
2540 if (tid_data->agg.state == IWL_AGG_OFF) {
2541 IWL_DEBUG_RATE(priv,
2542 "try to aggregate tid %d\n",
2543 tid);
2544 rs_tl_turn_on_agg(priv, tid,
2545 lq_sta, sta);
2546 }
2547 }
2548 rs_set_stay_in_table(priv, 0, lq_sta);
2549 }
2550 }
2551
2552 out:
2553 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2554 i = index;
2555 lq_sta->last_txrate_idx = i;
2556 }
2557
2558 /**
2559 * rs_initialize_lq - Initialize a station's hardware rate table
2560 *
2561 * The uCode's station table contains a table of fallback rates
2562 * for automatic fallback during transmission.
2563 *
2564 * NOTE: This sets up a default set of values. These will be replaced later
2565 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2566 * rc80211_simple.
2567 *
2568 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2569 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2570 * which requires station table entry to exist).
2571 */
2572 static void rs_initialize_lq(struct iwl_priv *priv,
2573 struct ieee80211_conf *conf,
2574 struct ieee80211_sta *sta,
2575 struct iwl_lq_sta *lq_sta)
2576 {
2577 struct iwl_scale_tbl_info *tbl;
2578 int rate_idx;
2579 int i;
2580 u32 rate;
2581 u8 use_green = rs_use_green(sta);
2582 u8 active_tbl = 0;
2583 u8 valid_tx_ant;
2584 struct iwl_station_priv *sta_priv;
2585 struct iwl_rxon_context *ctx;
2586
2587 if (!sta || !lq_sta)
2588 return;
2589
2590 sta_priv = (void *)sta->drv_priv;
2591 ctx = sta_priv->common.ctx;
2592
2593 i = lq_sta->last_txrate_idx;
2594
2595 valid_tx_ant = priv->hw_params.valid_tx_ant;
2596
2597 if (!lq_sta->search_better_tbl)
2598 active_tbl = lq_sta->active_tbl;
2599 else
2600 active_tbl = 1 - lq_sta->active_tbl;
2601
2602 tbl = &(lq_sta->lq_info[active_tbl]);
2603
2604 if ((i < 0) || (i >= IWL_RATE_COUNT))
2605 i = 0;
2606
2607 rate = iwl_rates[i].plcp;
2608 tbl->ant_type = first_antenna(valid_tx_ant);
2609 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2610
2611 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2612 rate |= RATE_MCS_CCK_MSK;
2613
2614 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2615 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2616 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2617
2618 rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2619 tbl->current_rate = rate;
2620 rs_set_expected_tpt_table(lq_sta, tbl);
2621 rs_fill_link_cmd(NULL, lq_sta, rate);
2622 priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2623 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_SYNC, true);
2624 }
2625
2626 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2627 struct ieee80211_tx_rate_control *txrc)
2628 {
2629
2630 struct sk_buff *skb = txrc->skb;
2631 struct ieee80211_supported_band *sband = txrc->sband;
2632 struct iwl_priv *priv __maybe_unused = (struct iwl_priv *)priv_r;
2633 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2634 struct iwl_lq_sta *lq_sta = priv_sta;
2635 int rate_idx;
2636
2637 IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2638
2639 /* Get max rate if user set max rate */
2640 if (lq_sta) {
2641 lq_sta->max_rate_idx = txrc->max_rate_idx;
2642 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2643 (lq_sta->max_rate_idx != -1))
2644 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2645 if ((lq_sta->max_rate_idx < 0) ||
2646 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2647 lq_sta->max_rate_idx = -1;
2648 }
2649
2650 /* Treat uninitialized rate scaling data same as non-existing. */
2651 if (lq_sta && !lq_sta->drv) {
2652 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
2653 priv_sta = NULL;
2654 }
2655
2656 /* Send management frames and NO_ACK data using lowest rate. */
2657 if (rate_control_send_low(sta, priv_sta, txrc))
2658 return;
2659
2660 rate_idx = lq_sta->last_txrate_idx;
2661
2662 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2663 rate_idx -= IWL_FIRST_OFDM_RATE;
2664 /* 6M and 9M shared same MCS index */
2665 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2666 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2667 IWL_RATE_MIMO3_6M_PLCP)
2668 rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2669 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2670 IWL_RATE_MIMO2_6M_PLCP)
2671 rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2672 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2673 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2674 info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2675 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2676 info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
2677 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2678 info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2679 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2680 info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2681 } else {
2682 /* Check for invalid rates */
2683 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2684 ((sband->band == IEEE80211_BAND_5GHZ) &&
2685 (rate_idx < IWL_FIRST_OFDM_RATE)))
2686 rate_idx = rate_lowest_index(sband, sta);
2687 /* On valid 5 GHz rate, adjust index */
2688 else if (sband->band == IEEE80211_BAND_5GHZ)
2689 rate_idx -= IWL_FIRST_OFDM_RATE;
2690 info->control.rates[0].flags = 0;
2691 }
2692 info->control.rates[0].idx = rate_idx;
2693
2694 }
2695
2696 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2697 gfp_t gfp)
2698 {
2699 struct iwl_lq_sta *lq_sta;
2700 struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2701 struct iwl_priv *priv;
2702
2703 priv = (struct iwl_priv *)priv_rate;
2704 IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2705
2706 lq_sta = &sta_priv->lq_sta;
2707
2708 return lq_sta;
2709 }
2710
2711 /*
2712 * Called after adding a new station to initialize rate scaling
2713 */
2714 void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id)
2715 {
2716 int i, j;
2717 struct ieee80211_hw *hw = priv->hw;
2718 struct ieee80211_conf *conf = &priv->hw->conf;
2719 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2720 struct iwl_station_priv *sta_priv;
2721 struct iwl_lq_sta *lq_sta;
2722 struct ieee80211_supported_band *sband;
2723
2724 sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2725 lq_sta = &sta_priv->lq_sta;
2726 sband = hw->wiphy->bands[conf->channel->band];
2727
2728
2729 lq_sta->lq.sta_id = sta_id;
2730
2731 for (j = 0; j < LQ_SIZE; j++)
2732 for (i = 0; i < IWL_RATE_COUNT; i++)
2733 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2734
2735 lq_sta->flush_timer = 0;
2736 lq_sta->supp_rates = sta->supp_rates[sband->band];
2737 for (j = 0; j < LQ_SIZE; j++)
2738 for (i = 0; i < IWL_RATE_COUNT; i++)
2739 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2740
2741 IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n",
2742 sta_id);
2743 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2744 * the lowest or the highest rate.. Could consider using RSSI from
2745 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2746 * after assoc.. */
2747
2748 lq_sta->is_dup = 0;
2749 lq_sta->max_rate_idx = -1;
2750 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2751 lq_sta->is_green = rs_use_green(sta);
2752 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2753 lq_sta->band = priv->band;
2754 /*
2755 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2756 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2757 */
2758 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2759 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2760 lq_sta->active_siso_rate &= ~((u16)0x2);
2761 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2762
2763 /* Same here */
2764 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2765 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2766 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2767 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2768
2769 lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2770 lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2771 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2772 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2773
2774 IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2775 lq_sta->active_siso_rate,
2776 lq_sta->active_mimo2_rate,
2777 lq_sta->active_mimo3_rate);
2778
2779 /* These values will be overridden later */
2780 lq_sta->lq.general_params.single_stream_ant_msk =
2781 first_antenna(priv->hw_params.valid_tx_ant);
2782 lq_sta->lq.general_params.dual_stream_ant_msk =
2783 priv->hw_params.valid_tx_ant &
2784 ~first_antenna(priv->hw_params.valid_tx_ant);
2785 if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2786 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2787 } else if (num_of_ant(priv->hw_params.valid_tx_ant) == 2) {
2788 lq_sta->lq.general_params.dual_stream_ant_msk =
2789 priv->hw_params.valid_tx_ant;
2790 }
2791
2792 /* as default allow aggregation for all tids */
2793 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2794 lq_sta->drv = priv;
2795
2796 /* Set last_txrate_idx to lowest rate */
2797 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2798 if (sband->band == IEEE80211_BAND_5GHZ)
2799 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2800 lq_sta->is_agg = 0;
2801
2802 rs_initialize_lq(priv, conf, sta, lq_sta);
2803 }
2804
2805 static void rs_fill_link_cmd(struct iwl_priv *priv,
2806 struct iwl_lq_sta *lq_sta, u32 new_rate)
2807 {
2808 struct iwl_scale_tbl_info tbl_type;
2809 int index = 0;
2810 int rate_idx;
2811 int repeat_rate = 0;
2812 u8 ant_toggle_cnt = 0;
2813 u8 use_ht_possible = 1;
2814 u8 valid_tx_ant = 0;
2815 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2816
2817 /* Override starting rate (index 0) if needed for debug purposes */
2818 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2819
2820 /* Interpret new_rate (rate_n_flags) */
2821 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2822 &tbl_type, &rate_idx);
2823
2824 if (priv && priv->bt_full_concurrent) {
2825 /* 1x1 only */
2826 tbl_type.ant_type =
2827 first_antenna(priv->hw_params.valid_tx_ant);
2828 }
2829
2830 /* How many times should we repeat the initial rate? */
2831 if (is_legacy(tbl_type.lq_type)) {
2832 ant_toggle_cnt = 1;
2833 repeat_rate = IWL_NUMBER_TRY;
2834 } else {
2835 repeat_rate = IWL_HT_NUMBER_TRY;
2836 }
2837
2838 lq_cmd->general_params.mimo_delimiter =
2839 is_mimo(tbl_type.lq_type) ? 1 : 0;
2840
2841 /* Fill 1st table entry (index 0) */
2842 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2843
2844 if (num_of_ant(tbl_type.ant_type) == 1) {
2845 lq_cmd->general_params.single_stream_ant_msk =
2846 tbl_type.ant_type;
2847 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2848 lq_cmd->general_params.dual_stream_ant_msk =
2849 tbl_type.ant_type;
2850 } /* otherwise we don't modify the existing value */
2851
2852 index++;
2853 repeat_rate--;
2854 if (priv) {
2855 if (priv->bt_full_concurrent)
2856 valid_tx_ant = ANT_A;
2857 else
2858 valid_tx_ant = priv->hw_params.valid_tx_ant;
2859 }
2860
2861 /* Fill rest of rate table */
2862 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2863 /* Repeat initial/next rate.
2864 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2865 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2866 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2867 if (is_legacy(tbl_type.lq_type)) {
2868 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2869 ant_toggle_cnt++;
2870 else if (priv &&
2871 rs_toggle_antenna(valid_tx_ant,
2872 &new_rate, &tbl_type))
2873 ant_toggle_cnt = 1;
2874 }
2875
2876 /* Override next rate if needed for debug purposes */
2877 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2878
2879 /* Fill next table entry */
2880 lq_cmd->rs_table[index].rate_n_flags =
2881 cpu_to_le32(new_rate);
2882 repeat_rate--;
2883 index++;
2884 }
2885
2886 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2887 &rate_idx);
2888
2889 if (priv && priv->bt_full_concurrent) {
2890 /* 1x1 only */
2891 tbl_type.ant_type =
2892 first_antenna(priv->hw_params.valid_tx_ant);
2893 }
2894
2895 /* Indicate to uCode which entries might be MIMO.
2896 * If initial rate was MIMO, this will finally end up
2897 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2898 if (is_mimo(tbl_type.lq_type))
2899 lq_cmd->general_params.mimo_delimiter = index;
2900
2901 /* Get next rate */
2902 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2903 use_ht_possible);
2904
2905 /* How many times should we repeat the next rate? */
2906 if (is_legacy(tbl_type.lq_type)) {
2907 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2908 ant_toggle_cnt++;
2909 else if (priv &&
2910 rs_toggle_antenna(valid_tx_ant,
2911 &new_rate, &tbl_type))
2912 ant_toggle_cnt = 1;
2913
2914 repeat_rate = IWL_NUMBER_TRY;
2915 } else {
2916 repeat_rate = IWL_HT_NUMBER_TRY;
2917 }
2918
2919 /* Don't allow HT rates after next pass.
2920 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2921 use_ht_possible = 0;
2922
2923 /* Override next rate if needed for debug purposes */
2924 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2925
2926 /* Fill next table entry */
2927 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2928
2929 index++;
2930 repeat_rate--;
2931 }
2932
2933 lq_cmd->agg_params.agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2934 lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2935
2936 lq_cmd->agg_params.agg_time_limit =
2937 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2938 /*
2939 * overwrite if needed, pass aggregation time limit
2940 * to uCode in uSec
2941 */
2942 if (priv && priv->cfg->agg_time_limit &&
2943 priv->cfg->agg_time_limit >= LINK_QUAL_AGG_TIME_LIMIT_MIN &&
2944 priv->cfg->agg_time_limit <= LINK_QUAL_AGG_TIME_LIMIT_MAX)
2945 lq_cmd->agg_params.agg_time_limit =
2946 cpu_to_le16(priv->cfg->agg_time_limit);
2947 }
2948
2949 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2950 {
2951 return hw->priv;
2952 }
2953 /* rate scale requires free function to be implemented */
2954 static void rs_free(void *priv_rate)
2955 {
2956 return;
2957 }
2958
2959 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
2960 void *priv_sta)
2961 {
2962 struct iwl_priv *priv __maybe_unused = priv_r;
2963
2964 IWL_DEBUG_RATE(priv, "enter\n");
2965 IWL_DEBUG_RATE(priv, "leave\n");
2966 }
2967
2968
2969 #ifdef CONFIG_MAC80211_DEBUGFS
2970 static int open_file_generic(struct inode *inode, struct file *file)
2971 {
2972 file->private_data = inode->i_private;
2973 return 0;
2974 }
2975 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2976 u32 *rate_n_flags, int index)
2977 {
2978 struct iwl_priv *priv;
2979 u8 valid_tx_ant;
2980 u8 ant_sel_tx;
2981
2982 priv = lq_sta->drv;
2983 valid_tx_ant = priv->hw_params.valid_tx_ant;
2984 if (lq_sta->dbg_fixed_rate) {
2985 ant_sel_tx =
2986 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
2987 >> RATE_MCS_ANT_POS);
2988 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
2989 *rate_n_flags = lq_sta->dbg_fixed_rate;
2990 IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
2991 } else {
2992 lq_sta->dbg_fixed_rate = 0;
2993 IWL_ERR(priv,
2994 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
2995 ant_sel_tx, valid_tx_ant);
2996 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
2997 }
2998 } else {
2999 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3000 }
3001 }
3002
3003 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3004 const char __user *user_buf, size_t count, loff_t *ppos)
3005 {
3006 struct iwl_lq_sta *lq_sta = file->private_data;
3007 struct iwl_priv *priv;
3008 char buf[64];
3009 int buf_size;
3010 u32 parsed_rate;
3011 struct iwl_station_priv *sta_priv =
3012 container_of(lq_sta, struct iwl_station_priv, lq_sta);
3013 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
3014
3015 priv = lq_sta->drv;
3016 memset(buf, 0, sizeof(buf));
3017 buf_size = min(count, sizeof(buf) - 1);
3018 if (copy_from_user(buf, user_buf, buf_size))
3019 return -EFAULT;
3020
3021 if (sscanf(buf, "%x", &parsed_rate) == 1)
3022 lq_sta->dbg_fixed_rate = parsed_rate;
3023 else
3024 lq_sta->dbg_fixed_rate = 0;
3025
3026 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
3027 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3028 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3029 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3030
3031 IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
3032 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
3033
3034 if (lq_sta->dbg_fixed_rate) {
3035 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
3036 iwl_send_lq_cmd(lq_sta->drv, ctx, &lq_sta->lq, CMD_ASYNC,
3037 false);
3038 }
3039
3040 return count;
3041 }
3042
3043 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3044 char __user *user_buf, size_t count, loff_t *ppos)
3045 {
3046 char *buff;
3047 int desc = 0;
3048 int i = 0;
3049 int index = 0;
3050 ssize_t ret;
3051
3052 struct iwl_lq_sta *lq_sta = file->private_data;
3053 struct iwl_priv *priv;
3054 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3055
3056 priv = lq_sta->drv;
3057 buff = kmalloc(1024, GFP_KERNEL);
3058 if (!buff)
3059 return -ENOMEM;
3060
3061 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3062 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
3063 lq_sta->total_failed, lq_sta->total_success,
3064 lq_sta->active_legacy_rate);
3065 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3066 lq_sta->dbg_fixed_rate);
3067 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3068 (priv->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
3069 (priv->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
3070 (priv->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
3071 desc += sprintf(buff+desc, "lq type %s\n",
3072 (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
3073 if (is_Ht(tbl->lq_type)) {
3074 desc += sprintf(buff+desc, " %s",
3075 (is_siso(tbl->lq_type)) ? "SISO" :
3076 ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
3077 desc += sprintf(buff+desc, " %s",
3078 (tbl->is_ht40) ? "40MHz" : "20MHz");
3079 desc += sprintf(buff+desc, " %s %s %s\n", (tbl->is_SGI) ? "SGI" : "",
3080 (lq_sta->is_green) ? "GF enabled" : "",
3081 (lq_sta->is_agg) ? "AGG on" : "");
3082 }
3083 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3084 lq_sta->last_rate_n_flags);
3085 desc += sprintf(buff+desc, "general:"
3086 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
3087 lq_sta->lq.general_params.flags,
3088 lq_sta->lq.general_params.mimo_delimiter,
3089 lq_sta->lq.general_params.single_stream_ant_msk,
3090 lq_sta->lq.general_params.dual_stream_ant_msk);
3091
3092 desc += sprintf(buff+desc, "agg:"
3093 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3094 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
3095 lq_sta->lq.agg_params.agg_dis_start_th,
3096 lq_sta->lq.agg_params.agg_frame_cnt_limit);
3097
3098 desc += sprintf(buff+desc,
3099 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3100 lq_sta->lq.general_params.start_rate_index[0],
3101 lq_sta->lq.general_params.start_rate_index[1],
3102 lq_sta->lq.general_params.start_rate_index[2],
3103 lq_sta->lq.general_params.start_rate_index[3]);
3104
3105 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3106 index = iwl_hwrate_to_plcp_idx(
3107 le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
3108 if (is_legacy(tbl->lq_type)) {
3109 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
3110 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3111 iwl_rate_mcs[index].mbps);
3112 } else {
3113 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
3114 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3115 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
3116 }
3117 }
3118
3119 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3120 kfree(buff);
3121 return ret;
3122 }
3123
3124 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3125 .write = rs_sta_dbgfs_scale_table_write,
3126 .read = rs_sta_dbgfs_scale_table_read,
3127 .open = open_file_generic,
3128 };
3129 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3130 char __user *user_buf, size_t count, loff_t *ppos)
3131 {
3132 char *buff;
3133 int desc = 0;
3134 int i, j;
3135 ssize_t ret;
3136
3137 struct iwl_lq_sta *lq_sta = file->private_data;
3138
3139 buff = kmalloc(1024, GFP_KERNEL);
3140 if (!buff)
3141 return -ENOMEM;
3142
3143 for (i = 0; i < LQ_SIZE; i++) {
3144 desc += sprintf(buff+desc,
3145 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
3146 "rate=0x%X\n",
3147 lq_sta->active_tbl == i ? "*" : "x",
3148 lq_sta->lq_info[i].lq_type,
3149 lq_sta->lq_info[i].is_SGI,
3150 lq_sta->lq_info[i].is_ht40,
3151 lq_sta->lq_info[i].is_dup,
3152 lq_sta->is_green,
3153 lq_sta->lq_info[i].current_rate);
3154 for (j = 0; j < IWL_RATE_COUNT; j++) {
3155 desc += sprintf(buff+desc,
3156 "counter=%d success=%d %%=%d\n",
3157 lq_sta->lq_info[i].win[j].counter,
3158 lq_sta->lq_info[i].win[j].success_counter,
3159 lq_sta->lq_info[i].win[j].success_ratio);
3160 }
3161 }
3162 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3163 kfree(buff);
3164 return ret;
3165 }
3166
3167 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3168 .read = rs_sta_dbgfs_stats_table_read,
3169 .open = open_file_generic,
3170 };
3171
3172 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3173 char __user *user_buf, size_t count, loff_t *ppos)
3174 {
3175 char buff[120];
3176 int desc = 0;
3177 ssize_t ret;
3178
3179 struct iwl_lq_sta *lq_sta = file->private_data;
3180 struct iwl_priv *priv;
3181 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3182
3183 priv = lq_sta->drv;
3184
3185 if (is_Ht(tbl->lq_type))
3186 desc += sprintf(buff+desc,
3187 "Bit Rate= %d Mb/s\n",
3188 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3189 else
3190 desc += sprintf(buff+desc,
3191 "Bit Rate= %d Mb/s\n",
3192 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3193
3194 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3195 return ret;
3196 }
3197
3198 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3199 .read = rs_sta_dbgfs_rate_scale_data_read,
3200 .open = open_file_generic,
3201 };
3202
3203 static void rs_add_debugfs(void *priv, void *priv_sta,
3204 struct dentry *dir)
3205 {
3206 struct iwl_lq_sta *lq_sta = priv_sta;
3207 lq_sta->rs_sta_dbgfs_scale_table_file =
3208 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3209 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3210 lq_sta->rs_sta_dbgfs_stats_table_file =
3211 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3212 lq_sta, &rs_sta_dbgfs_stats_table_ops);
3213 lq_sta->rs_sta_dbgfs_rate_scale_data_file =
3214 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
3215 lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
3216 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
3217 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3218 &lq_sta->tx_agg_tid_en);
3219
3220 }
3221
3222 static void rs_remove_debugfs(void *priv, void *priv_sta)
3223 {
3224 struct iwl_lq_sta *lq_sta = priv_sta;
3225 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3226 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
3227 debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
3228 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
3229 }
3230 #endif
3231
3232 /*
3233 * Initialization of rate scaling information is done by driver after
3234 * the station is added. Since mac80211 calls this function before a
3235 * station is added we ignore it.
3236 */
3237 static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband,
3238 struct ieee80211_sta *sta, void *priv_sta)
3239 {
3240 }
3241 static struct rate_control_ops rs_ops = {
3242 .module = NULL,
3243 .name = RS_NAME,
3244 .tx_status = rs_tx_status,
3245 .get_rate = rs_get_rate,
3246 .rate_init = rs_rate_init_stub,
3247 .alloc = rs_alloc,
3248 .free = rs_free,
3249 .alloc_sta = rs_alloc_sta,
3250 .free_sta = rs_free_sta,
3251 #ifdef CONFIG_MAC80211_DEBUGFS
3252 .add_sta_debugfs = rs_add_debugfs,
3253 .remove_sta_debugfs = rs_remove_debugfs,
3254 #endif
3255 };
3256
3257 int iwlagn_rate_control_register(void)
3258 {
3259 return ieee80211_rate_control_register(&rs_ops);
3260 }
3261
3262 void iwlagn_rate_control_unregister(void)
3263 {
3264 ieee80211_rate_control_unregister(&rs_ops);
3265 }
3266
Linux kernel - Deliverables
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