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