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Staging: netwave: delete the driver
[linux/fpc-iii.git] / drivers / net / wireless / iwlwifi / iwl-agn-rs.c
blob1460116d329f2c65b39d88ed295069295648b1f2
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 void 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;
303
304 if (rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
305 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
306 sta->addr, tid);
307 ret = ieee80211_start_tx_ba_session(sta, tid);
308 if (ret == -EAGAIN) {
309 /*
310 * driver and mac80211 is out of sync
311 * this might be cause by reloading firmware
312 * stop the tx ba session here
313 */
314 IWL_DEBUG_HT(priv, "Fail start Tx agg on tid: %d\n",
315 tid);
316 ret = ieee80211_stop_tx_ba_session(sta, tid,
317 WLAN_BACK_INITIATOR);
318 }
319 }
320 }
321
322 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
323 struct iwl_lq_sta *lq_data,
324 struct ieee80211_sta *sta)
325 {
326 if ((tid < TID_MAX_LOAD_COUNT))
327 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
328 else if (tid == IWL_AGG_ALL_TID)
329 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
330 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
331 if (priv->cfg->use_rts_for_ht) {
332 /*
333 * switch to RTS/CTS if it is the prefer protection method
334 * for HT traffic
335 */
336 IWL_DEBUG_HT(priv, "use RTS/CTS protection for HT\n");
337 priv->staging_rxon.flags &= ~RXON_FLG_SELF_CTS_EN;
338 iwlcore_commit_rxon(priv);
339 }
340 }
341
342 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
343 {
344 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
345 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
346 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
347 }
348
349 /*
350 * Static function to get the expected throughput from an iwl_scale_tbl_info
351 * that wraps a NULL pointer check
352 */
353 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
354 {
355 if (tbl->expected_tpt)
356 return tbl->expected_tpt[rs_index];
357 return 0;
358 }
359
360 /**
361 * rs_collect_tx_data - Update the success/failure sliding window
362 *
363 * We keep a sliding window of the last 62 packets transmitted
364 * at this rate. window->data contains the bitmask of successful
365 * packets.
366 */
367 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
368 int scale_index, int attempts, int successes)
369 {
370 struct iwl_rate_scale_data *window = NULL;
371 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
372 s32 fail_count, tpt;
373
374 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
375 return -EINVAL;
376
377 /* Select window for current tx bit rate */
378 window = &(tbl->win[scale_index]);
379
380 /* Get expected throughput */
381 tpt = get_expected_tpt(tbl, scale_index);
382
383 /*
384 * Keep track of only the latest 62 tx frame attempts in this rate's
385 * history window; anything older isn't really relevant any more.
386 * If we have filled up the sliding window, drop the oldest attempt;
387 * if the oldest attempt (highest bit in bitmap) shows "success",
388 * subtract "1" from the success counter (this is the main reason
389 * we keep these bitmaps!).
390 */
391 while (attempts > 0) {
392 if (window->counter >= IWL_RATE_MAX_WINDOW) {
393
394 /* remove earliest */
395 window->counter = IWL_RATE_MAX_WINDOW - 1;
396
397 if (window->data & mask) {
398 window->data &= ~mask;
399 window->success_counter--;
400 }
401 }
402
403 /* Increment frames-attempted counter */
404 window->counter++;
405
406 /* Shift bitmap by one frame to throw away oldest history */
407 window->data <<= 1;
408
409 /* Mark the most recent #successes attempts as successful */
410 if (successes > 0) {
411 window->success_counter++;
412 window->data |= 0x1;
413 successes--;
414 }
415
416 attempts--;
417 }
418
419 /* Calculate current success ratio, avoid divide-by-0! */
420 if (window->counter > 0)
421 window->success_ratio = 128 * (100 * window->success_counter)
422 / window->counter;
423 else
424 window->success_ratio = IWL_INVALID_VALUE;
425
426 fail_count = window->counter - window->success_counter;
427
428 /* Calculate average throughput, if we have enough history. */
429 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
430 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
431 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
432 else
433 window->average_tpt = IWL_INVALID_VALUE;
434
435 /* Tag this window as having been updated */
436 window->stamp = jiffies;
437
438 return 0;
439 }
440
441 /*
442 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
443 */
444 /* FIXME:RS:remove this function and put the flags statically in the table */
445 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
446 struct iwl_scale_tbl_info *tbl,
447 int index, u8 use_green)
448 {
449 u32 rate_n_flags = 0;
450
451 if (is_legacy(tbl->lq_type)) {
452 rate_n_flags = iwl_rates[index].plcp;
453 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
454 rate_n_flags |= RATE_MCS_CCK_MSK;
455
456 } else if (is_Ht(tbl->lq_type)) {
457 if (index > IWL_LAST_OFDM_RATE) {
458 IWL_ERR(priv, "Invalid HT rate index %d\n", index);
459 index = IWL_LAST_OFDM_RATE;
460 }
461 rate_n_flags = RATE_MCS_HT_MSK;
462
463 if (is_siso(tbl->lq_type))
464 rate_n_flags |= iwl_rates[index].plcp_siso;
465 else if (is_mimo2(tbl->lq_type))
466 rate_n_flags |= iwl_rates[index].plcp_mimo2;
467 else
468 rate_n_flags |= iwl_rates[index].plcp_mimo3;
469 } else {
470 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
471 }
472
473 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
474 RATE_MCS_ANT_ABC_MSK);
475
476 if (is_Ht(tbl->lq_type)) {
477 if (tbl->is_ht40) {
478 if (tbl->is_dup)
479 rate_n_flags |= RATE_MCS_DUP_MSK;
480 else
481 rate_n_flags |= RATE_MCS_HT40_MSK;
482 }
483 if (tbl->is_SGI)
484 rate_n_flags |= RATE_MCS_SGI_MSK;
485
486 if (use_green) {
487 rate_n_flags |= RATE_MCS_GF_MSK;
488 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
489 rate_n_flags &= ~RATE_MCS_SGI_MSK;
490 IWL_ERR(priv, "GF was set with SGI:SISO\n");
491 }
492 }
493 }
494 return rate_n_flags;
495 }
496
497 /*
498 * Interpret uCode API's rate_n_flags format,
499 * fill "search" or "active" tx mode table.
500 */
501 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
502 enum ieee80211_band band,
503 struct iwl_scale_tbl_info *tbl,
504 int *rate_idx)
505 {
506 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
507 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
508 u8 mcs;
509
510 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
511
512 if (*rate_idx == IWL_RATE_INVALID) {
513 *rate_idx = -1;
514 return -EINVAL;
515 }
516 tbl->is_SGI = 0; /* default legacy setup */
517 tbl->is_ht40 = 0;
518 tbl->is_dup = 0;
519 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
520 tbl->lq_type = LQ_NONE;
521 tbl->max_search = IWL_MAX_SEARCH;
522
523 /* legacy rate format */
524 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
525 if (num_of_ant == 1) {
526 if (band == IEEE80211_BAND_5GHZ)
527 tbl->lq_type = LQ_A;
528 else
529 tbl->lq_type = LQ_G;
530 }
531 /* HT rate format */
532 } else {
533 if (rate_n_flags & RATE_MCS_SGI_MSK)
534 tbl->is_SGI = 1;
535
536 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
537 (rate_n_flags & RATE_MCS_DUP_MSK))
538 tbl->is_ht40 = 1;
539
540 if (rate_n_flags & RATE_MCS_DUP_MSK)
541 tbl->is_dup = 1;
542
543 mcs = rs_extract_rate(rate_n_flags);
544
545 /* SISO */
546 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
547 if (num_of_ant == 1)
548 tbl->lq_type = LQ_SISO; /*else NONE*/
549 /* MIMO2 */
550 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
551 if (num_of_ant == 2)
552 tbl->lq_type = LQ_MIMO2;
553 /* MIMO3 */
554 } else {
555 if (num_of_ant == 3) {
556 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
557 tbl->lq_type = LQ_MIMO3;
558 }
559 }
560 }
561 return 0;
562 }
563
564 /* switch to another antenna/antennas and return 1 */
565 /* if no other valid antenna found, return 0 */
566 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
567 struct iwl_scale_tbl_info *tbl)
568 {
569 u8 new_ant_type;
570
571 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
572 return 0;
573
574 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
575 return 0;
576
577 new_ant_type = ant_toggle_lookup[tbl->ant_type];
578
579 while ((new_ant_type != tbl->ant_type) &&
580 !rs_is_valid_ant(valid_ant, new_ant_type))
581 new_ant_type = ant_toggle_lookup[new_ant_type];
582
583 if (new_ant_type == tbl->ant_type)
584 return 0;
585
586 tbl->ant_type = new_ant_type;
587 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
588 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
589 return 1;
590 }
591
592 /**
593 * Green-field mode is valid if the station supports it and
594 * there are no non-GF stations present in the BSS.
595 */
596 static inline u8 rs_use_green(struct ieee80211_sta *sta,
597 struct iwl_ht_config *ht_conf)
598 {
599 return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
600 !(ht_conf->non_GF_STA_present);
601 }
602
603 /**
604 * rs_get_supported_rates - get the available rates
605 *
606 * if management frame or broadcast frame only return
607 * basic available rates.
608 *
609 */
610 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
611 struct ieee80211_hdr *hdr,
612 enum iwl_table_type rate_type)
613 {
614 if (hdr && is_multicast_ether_addr(hdr->addr1) &&
615 lq_sta->active_rate_basic)
616 return lq_sta->active_rate_basic;
617
618 if (is_legacy(rate_type)) {
619 return lq_sta->active_legacy_rate;
620 } else {
621 if (is_siso(rate_type))
622 return lq_sta->active_siso_rate;
623 else if (is_mimo2(rate_type))
624 return lq_sta->active_mimo2_rate;
625 else
626 return lq_sta->active_mimo3_rate;
627 }
628 }
629
630 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
631 int rate_type)
632 {
633 u8 high = IWL_RATE_INVALID;
634 u8 low = IWL_RATE_INVALID;
635
636 /* 802.11A or ht walks to the next literal adjacent rate in
637 * the rate table */
638 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
639 int i;
640 u32 mask;
641
642 /* Find the previous rate that is in the rate mask */
643 i = index - 1;
644 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
645 if (rate_mask & mask) {
646 low = i;
647 break;
648 }
649 }
650
651 /* Find the next rate that is in the rate mask */
652 i = index + 1;
653 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
654 if (rate_mask & mask) {
655 high = i;
656 break;
657 }
658 }
659
660 return (high << 8) | low;
661 }
662
663 low = index;
664 while (low != IWL_RATE_INVALID) {
665 low = iwl_rates[low].prev_rs;
666 if (low == IWL_RATE_INVALID)
667 break;
668 if (rate_mask & (1 << low))
669 break;
670 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
671 }
672
673 high = index;
674 while (high != IWL_RATE_INVALID) {
675 high = iwl_rates[high].next_rs;
676 if (high == IWL_RATE_INVALID)
677 break;
678 if (rate_mask & (1 << high))
679 break;
680 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
681 }
682
683 return (high << 8) | low;
684 }
685
686 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
687 struct iwl_scale_tbl_info *tbl,
688 u8 scale_index, u8 ht_possible)
689 {
690 s32 low;
691 u16 rate_mask;
692 u16 high_low;
693 u8 switch_to_legacy = 0;
694 u8 is_green = lq_sta->is_green;
695 struct iwl_priv *priv = lq_sta->drv;
696
697 /* check if we need to switch from HT to legacy rates.
698 * assumption is that mandatory rates (1Mbps or 6Mbps)
699 * are always supported (spec demand) */
700 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
701 switch_to_legacy = 1;
702 scale_index = rs_ht_to_legacy[scale_index];
703 if (lq_sta->band == IEEE80211_BAND_5GHZ)
704 tbl->lq_type = LQ_A;
705 else
706 tbl->lq_type = LQ_G;
707
708 if (num_of_ant(tbl->ant_type) > 1)
709 tbl->ant_type =
710 first_antenna(priv->hw_params.valid_tx_ant);
711
712 tbl->is_ht40 = 0;
713 tbl->is_SGI = 0;
714 tbl->max_search = IWL_MAX_SEARCH;
715 }
716
717 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
718
719 /* Mask with station rate restriction */
720 if (is_legacy(tbl->lq_type)) {
721 /* supp_rates has no CCK bits in A mode */
722 if (lq_sta->band == IEEE80211_BAND_5GHZ)
723 rate_mask = (u16)(rate_mask &
724 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
725 else
726 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
727 }
728
729 /* If we switched from HT to legacy, check current rate */
730 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
731 low = scale_index;
732 goto out;
733 }
734
735 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
736 tbl->lq_type);
737 low = high_low & 0xff;
738
739 if (low == IWL_RATE_INVALID)
740 low = scale_index;
741
742 out:
743 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
744 }
745
746 /*
747 * Simple function to compare two rate scale table types
748 */
749 static bool table_type_matches(struct iwl_scale_tbl_info *a,
750 struct iwl_scale_tbl_info *b)
751 {
752 return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
753 (a->is_SGI == b->is_SGI);
754 }
755
756 /*
757 * mac80211 sends us Tx status
758 */
759 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
760 struct ieee80211_sta *sta, void *priv_sta,
761 struct sk_buff *skb)
762 {
763 int legacy_success;
764 int retries;
765 int rs_index, mac_index, i;
766 struct iwl_lq_sta *lq_sta = priv_sta;
767 struct iwl_link_quality_cmd *table;
768 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
769 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
770 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
771 enum mac80211_rate_control_flags mac_flags;
772 u32 tx_rate;
773 struct iwl_scale_tbl_info tbl_type;
774 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
775
776 IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
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 if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
788 !lq_sta->ibss_sta_added)
789 return;
790
791 /*
792 * Ignore this Tx frame response if its initial rate doesn't match
793 * that of latest Link Quality command. There may be stragglers
794 * from a previous Link Quality command, but we're no longer interested
795 * in those; they're either from the "active" mode while we're trying
796 * to check "search" mode, or a prior "search" mode after we've moved
797 * to a new "search" mode (which might become the new "active" mode).
798 */
799 table = &lq_sta->lq;
800 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
801 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
802 if (priv->band == IEEE80211_BAND_5GHZ)
803 rs_index -= IWL_FIRST_OFDM_RATE;
804 mac_flags = info->status.rates[0].flags;
805 mac_index = info->status.rates[0].idx;
806 /* For HT packets, map MCS to PLCP */
807 if (mac_flags & IEEE80211_TX_RC_MCS) {
808 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
809 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
810 mac_index++;
811 /*
812 * mac80211 HT index is always zero-indexed; we need to move
813 * HT OFDM rates after CCK rates in 2.4 GHz band
814 */
815 if (priv->band == IEEE80211_BAND_2GHZ)
816 mac_index += IWL_FIRST_OFDM_RATE;
817 }
818 /* Here we actually compare this rate to the latest LQ command */
819 if ((mac_index < 0) ||
820 (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
821 (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
822 (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
823 (tbl_type.ant_type != info->antenna_sel_tx) ||
824 (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
825 (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
826 (rs_index != mac_index)) {
827 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate);
828 /*
829 * Since rates mis-match, the last LQ command may have failed.
830 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
831 * ... driver.
832 */
833 lq_sta->missed_rate_counter++;
834 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
835 lq_sta->missed_rate_counter = 0;
836 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
837 }
838 /* Regardless, ignore this status info for outdated rate */
839 return;
840 } else
841 /* Rate did match, so reset the missed_rate_counter */
842 lq_sta->missed_rate_counter = 0;
843
844 /* Figure out if rate scale algorithm is in active or search table */
845 if (table_type_matches(&tbl_type,
846 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
847 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
848 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
849 } else if (table_type_matches(&tbl_type,
850 &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
851 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
852 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
853 } else {
854 IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n");
855 return;
856 }
857
858 /*
859 * Updating the frame history depends on whether packets were
860 * aggregated.
861 *
862 * For aggregation, all packets were transmitted at the same rate, the
863 * first index into rate scale table.
864 */
865 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
866 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
867 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
868 &rs_index);
869 rs_collect_tx_data(curr_tbl, rs_index,
870 info->status.ampdu_ack_len,
871 info->status.ampdu_ack_map);
872
873 /* Update success/fail counts if not searching for new mode */
874 if (lq_sta->stay_in_tbl) {
875 lq_sta->total_success += info->status.ampdu_ack_map;
876 lq_sta->total_failed += (info->status.ampdu_ack_len -
877 info->status.ampdu_ack_map);
878 }
879 } else {
880 /*
881 * For legacy, update frame history with for each Tx retry.
882 */
883 retries = info->status.rates[0].count - 1;
884 /* HW doesn't send more than 15 retries */
885 retries = min(retries, 15);
886
887 /* The last transmission may have been successful */
888 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
889 /* Collect data for each rate used during failed TX attempts */
890 for (i = 0; i <= retries; ++i) {
891 tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
892 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
893 &tbl_type, &rs_index);
894 /*
895 * Only collect stats if retried rate is in the same RS
896 * table as active/search.
897 */
898 if (table_type_matches(&tbl_type, curr_tbl))
899 tmp_tbl = curr_tbl;
900 else if (table_type_matches(&tbl_type, other_tbl))
901 tmp_tbl = other_tbl;
902 else
903 continue;
904 rs_collect_tx_data(tmp_tbl, rs_index, 1,
905 i < retries ? 0 : legacy_success);
906 }
907
908 /* Update success/fail counts if not searching for new mode */
909 if (lq_sta->stay_in_tbl) {
910 lq_sta->total_success += legacy_success;
911 lq_sta->total_failed += retries + (1 - legacy_success);
912 }
913 }
914 /* The last TX rate is cached in lq_sta; it's set in if/else above */
915 lq_sta->last_rate_n_flags = tx_rate;
916
917 /* See if there's a better rate or modulation mode to try. */
918 if (sta && sta->supp_rates[sband->band])
919 rs_rate_scale_perform(priv, skb, sta, lq_sta);
920 }
921
922 /*
923 * Begin a period of staying with a selected modulation mode.
924 * Set "stay_in_tbl" flag to prevent any mode switches.
925 * Set frame tx success limits according to legacy vs. high-throughput,
926 * and reset overall (spanning all rates) tx success history statistics.
927 * These control how long we stay using same modulation mode before
928 * searching for a new mode.
929 */
930 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
931 struct iwl_lq_sta *lq_sta)
932 {
933 IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
934 lq_sta->stay_in_tbl = 1; /* only place this gets set */
935 if (is_legacy) {
936 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
937 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
938 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
939 } else {
940 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
941 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
942 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
943 }
944 lq_sta->table_count = 0;
945 lq_sta->total_failed = 0;
946 lq_sta->total_success = 0;
947 lq_sta->flush_timer = jiffies;
948 lq_sta->action_counter = 0;
949 }
950
951 /*
952 * Find correct throughput table for given mode of modulation
953 */
954 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
955 struct iwl_scale_tbl_info *tbl)
956 {
957 /* Used to choose among HT tables */
958 s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
959
960 /* Check for invalid LQ type */
961 if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
962 tbl->expected_tpt = expected_tpt_legacy;
963 return;
964 }
965
966 /* Legacy rates have only one table */
967 if (is_legacy(tbl->lq_type)) {
968 tbl->expected_tpt = expected_tpt_legacy;
969 return;
970 }
971
972 /* Choose among many HT tables depending on number of streams
973 * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
974 * status */
975 if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
976 ht_tbl_pointer = expected_tpt_siso20MHz;
977 else if (is_siso(tbl->lq_type))
978 ht_tbl_pointer = expected_tpt_siso40MHz;
979 else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
980 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
981 else if (is_mimo2(tbl->lq_type))
982 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
983 else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
984 ht_tbl_pointer = expected_tpt_mimo3_20MHz;
985 else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
986 ht_tbl_pointer = expected_tpt_mimo3_40MHz;
987
988 if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */
989 tbl->expected_tpt = ht_tbl_pointer[0];
990 else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */
991 tbl->expected_tpt = ht_tbl_pointer[1];
992 else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */
993 tbl->expected_tpt = ht_tbl_pointer[2];
994 else /* AGG+SGI */
995 tbl->expected_tpt = ht_tbl_pointer[3];
996 }
997
998 /*
999 * Find starting rate for new "search" high-throughput mode of modulation.
1000 * Goal is to find lowest expected rate (under perfect conditions) that is
1001 * above the current measured throughput of "active" mode, to give new mode
1002 * a fair chance to prove itself without too many challenges.
1003 *
1004 * This gets called when transitioning to more aggressive modulation
1005 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1006 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1007 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1008 * bit rate will typically need to increase, but not if performance was bad.
1009 */
1010 static s32 rs_get_best_rate(struct iwl_priv *priv,
1011 struct iwl_lq_sta *lq_sta,
1012 struct iwl_scale_tbl_info *tbl, /* "search" */
1013 u16 rate_mask, s8 index)
1014 {
1015 /* "active" values */
1016 struct iwl_scale_tbl_info *active_tbl =
1017 &(lq_sta->lq_info[lq_sta->active_tbl]);
1018 s32 active_sr = active_tbl->win[index].success_ratio;
1019 s32 active_tpt = active_tbl->expected_tpt[index];
1020
1021 /* expected "search" throughput */
1022 s32 *tpt_tbl = tbl->expected_tpt;
1023
1024 s32 new_rate, high, low, start_hi;
1025 u16 high_low;
1026 s8 rate = index;
1027
1028 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1029
1030 for (; ;) {
1031 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1032 tbl->lq_type);
1033
1034 low = high_low & 0xff;
1035 high = (high_low >> 8) & 0xff;
1036
1037 /*
1038 * Lower the "search" bit rate, to give new "search" mode
1039 * approximately the same throughput as "active" if:
1040 *
1041 * 1) "Active" mode has been working modestly well (but not
1042 * great), and expected "search" throughput (under perfect
1043 * conditions) at candidate rate is above the actual
1044 * measured "active" throughput (but less than expected
1045 * "active" throughput under perfect conditions).
1046 * OR
1047 * 2) "Active" mode has been working perfectly or very well
1048 * and expected "search" throughput (under perfect
1049 * conditions) at candidate rate is above expected
1050 * "active" throughput (under perfect conditions).
1051 */
1052 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1053 ((active_sr > IWL_RATE_DECREASE_TH) &&
1054 (active_sr <= IWL_RATE_HIGH_TH) &&
1055 (tpt_tbl[rate] <= active_tpt))) ||
1056 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1057 (tpt_tbl[rate] > active_tpt))) {
1058
1059 /* (2nd or later pass)
1060 * If we've already tried to raise the rate, and are
1061 * now trying to lower it, use the higher rate. */
1062 if (start_hi != IWL_RATE_INVALID) {
1063 new_rate = start_hi;
1064 break;
1065 }
1066
1067 new_rate = rate;
1068
1069 /* Loop again with lower rate */
1070 if (low != IWL_RATE_INVALID)
1071 rate = low;
1072
1073 /* Lower rate not available, use the original */
1074 else
1075 break;
1076
1077 /* Else try to raise the "search" rate to match "active" */
1078 } else {
1079 /* (2nd or later pass)
1080 * If we've already tried to lower the rate, and are
1081 * now trying to raise it, use the lower rate. */
1082 if (new_rate != IWL_RATE_INVALID)
1083 break;
1084
1085 /* Loop again with higher rate */
1086 else if (high != IWL_RATE_INVALID) {
1087 start_hi = high;
1088 rate = high;
1089
1090 /* Higher rate not available, use the original */
1091 } else {
1092 new_rate = rate;
1093 break;
1094 }
1095 }
1096 }
1097
1098 return new_rate;
1099 }
1100
1101 /*
1102 * Set up search table for MIMO2
1103 */
1104 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1105 struct iwl_lq_sta *lq_sta,
1106 struct ieee80211_conf *conf,
1107 struct ieee80211_sta *sta,
1108 struct iwl_scale_tbl_info *tbl, int index)
1109 {
1110 u16 rate_mask;
1111 s32 rate;
1112 s8 is_green = lq_sta->is_green;
1113
1114 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1115 return -1;
1116
1117 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1118 == WLAN_HT_CAP_SM_PS_STATIC)
1119 return -1;
1120
1121 /* Need both Tx chains/antennas to support MIMO */
1122 if (priv->hw_params.tx_chains_num < 2)
1123 return -1;
1124
1125 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1126
1127 tbl->lq_type = LQ_MIMO2;
1128 tbl->is_dup = lq_sta->is_dup;
1129 tbl->action = 0;
1130 tbl->max_search = IWL_MAX_SEARCH;
1131 rate_mask = lq_sta->active_mimo2_rate;
1132
1133 if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1134 tbl->is_ht40 = 1;
1135 else
1136 tbl->is_ht40 = 0;
1137
1138 rs_set_expected_tpt_table(lq_sta, tbl);
1139
1140 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1141
1142 IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1143 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1144 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1145 rate, rate_mask);
1146 return -1;
1147 }
1148 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1149
1150 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1151 tbl->current_rate, is_green);
1152 return 0;
1153 }
1154
1155 /*
1156 * Set up search table for MIMO3
1157 */
1158 static int rs_switch_to_mimo3(struct iwl_priv *priv,
1159 struct iwl_lq_sta *lq_sta,
1160 struct ieee80211_conf *conf,
1161 struct ieee80211_sta *sta,
1162 struct iwl_scale_tbl_info *tbl, int index)
1163 {
1164 u16 rate_mask;
1165 s32 rate;
1166 s8 is_green = lq_sta->is_green;
1167
1168 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1169 return -1;
1170
1171 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1172 == WLAN_HT_CAP_SM_PS_STATIC)
1173 return -1;
1174
1175 /* Need both Tx chains/antennas to support MIMO */
1176 if (priv->hw_params.tx_chains_num < 3)
1177 return -1;
1178
1179 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1180
1181 tbl->lq_type = LQ_MIMO3;
1182 tbl->is_dup = lq_sta->is_dup;
1183 tbl->action = 0;
1184 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1185 rate_mask = lq_sta->active_mimo3_rate;
1186
1187 if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1188 tbl->is_ht40 = 1;
1189 else
1190 tbl->is_ht40 = 0;
1191
1192 rs_set_expected_tpt_table(lq_sta, tbl);
1193
1194 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1195
1196 IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1197 rate, rate_mask);
1198 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1199 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1200 rate, rate_mask);
1201 return -1;
1202 }
1203 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1204
1205 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1206 tbl->current_rate, is_green);
1207 return 0;
1208 }
1209
1210 /*
1211 * Set up search table for SISO
1212 */
1213 static int rs_switch_to_siso(struct iwl_priv *priv,
1214 struct iwl_lq_sta *lq_sta,
1215 struct ieee80211_conf *conf,
1216 struct ieee80211_sta *sta,
1217 struct iwl_scale_tbl_info *tbl, int index)
1218 {
1219 u16 rate_mask;
1220 u8 is_green = lq_sta->is_green;
1221 s32 rate;
1222
1223 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1224 return -1;
1225
1226 IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1227
1228 tbl->is_dup = lq_sta->is_dup;
1229 tbl->lq_type = LQ_SISO;
1230 tbl->action = 0;
1231 tbl->max_search = IWL_MAX_SEARCH;
1232 rate_mask = lq_sta->active_siso_rate;
1233
1234 if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1235 tbl->is_ht40 = 1;
1236 else
1237 tbl->is_ht40 = 0;
1238
1239 if (is_green)
1240 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1241
1242 rs_set_expected_tpt_table(lq_sta, tbl);
1243 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1244
1245 IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1246 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1247 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1248 rate, rate_mask);
1249 return -1;
1250 }
1251 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1252 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1253 tbl->current_rate, is_green);
1254 return 0;
1255 }
1256
1257 /*
1258 * Try to switch to new modulation mode from legacy
1259 */
1260 static int rs_move_legacy_other(struct iwl_priv *priv,
1261 struct iwl_lq_sta *lq_sta,
1262 struct ieee80211_conf *conf,
1263 struct ieee80211_sta *sta,
1264 int index)
1265 {
1266 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1267 struct iwl_scale_tbl_info *search_tbl =
1268 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1269 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1270 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1271 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1272 u8 start_action = tbl->action;
1273 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1274 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1275 int ret = 0;
1276 u8 update_search_tbl_counter = 0;
1277
1278 if (!iwl_ht_enabled(priv))
1279 /* stay in Legacy */
1280 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1281 else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1282 tbl->action > IWL_LEGACY_SWITCH_SISO)
1283 tbl->action = IWL_LEGACY_SWITCH_SISO;
1284 for (; ;) {
1285 lq_sta->action_counter++;
1286 switch (tbl->action) {
1287 case IWL_LEGACY_SWITCH_ANTENNA1:
1288 case IWL_LEGACY_SWITCH_ANTENNA2:
1289 IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1290
1291 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1292 tx_chains_num <= 1) ||
1293 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1294 tx_chains_num <= 2))
1295 break;
1296
1297 /* Don't change antenna if success has been great */
1298 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1299 break;
1300
1301 /* Set up search table to try other antenna */
1302 memcpy(search_tbl, tbl, sz);
1303
1304 if (rs_toggle_antenna(valid_tx_ant,
1305 &search_tbl->current_rate, search_tbl)) {
1306 update_search_tbl_counter = 1;
1307 rs_set_expected_tpt_table(lq_sta, search_tbl);
1308 goto out;
1309 }
1310 break;
1311 case IWL_LEGACY_SWITCH_SISO:
1312 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1313
1314 /* Set up search table to try SISO */
1315 memcpy(search_tbl, tbl, sz);
1316 search_tbl->is_SGI = 0;
1317 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1318 search_tbl, index);
1319 if (!ret) {
1320 lq_sta->action_counter = 0;
1321 goto out;
1322 }
1323
1324 break;
1325 case IWL_LEGACY_SWITCH_MIMO2_AB:
1326 case IWL_LEGACY_SWITCH_MIMO2_AC:
1327 case IWL_LEGACY_SWITCH_MIMO2_BC:
1328 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1329
1330 /* Set up search table to try MIMO */
1331 memcpy(search_tbl, tbl, sz);
1332 search_tbl->is_SGI = 0;
1333
1334 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1335 search_tbl->ant_type = ANT_AB;
1336 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1337 search_tbl->ant_type = ANT_AC;
1338 else
1339 search_tbl->ant_type = ANT_BC;
1340
1341 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1342 break;
1343
1344 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1345 search_tbl, index);
1346 if (!ret) {
1347 lq_sta->action_counter = 0;
1348 goto out;
1349 }
1350 break;
1351
1352 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1353 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1354
1355 /* Set up search table to try MIMO3 */
1356 memcpy(search_tbl, tbl, sz);
1357 search_tbl->is_SGI = 0;
1358
1359 search_tbl->ant_type = ANT_ABC;
1360
1361 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1362 break;
1363
1364 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1365 search_tbl, index);
1366 if (!ret) {
1367 lq_sta->action_counter = 0;
1368 goto out;
1369 }
1370 break;
1371 }
1372 tbl->action++;
1373 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1374 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1375
1376 if (tbl->action == start_action)
1377 break;
1378
1379 }
1380 search_tbl->lq_type = LQ_NONE;
1381 return 0;
1382
1383 out:
1384 lq_sta->search_better_tbl = 1;
1385 tbl->action++;
1386 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1387 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1388 if (update_search_tbl_counter)
1389 search_tbl->action = tbl->action;
1390 return 0;
1391
1392 }
1393
1394 /*
1395 * Try to switch to new modulation mode from SISO
1396 */
1397 static int rs_move_siso_to_other(struct iwl_priv *priv,
1398 struct iwl_lq_sta *lq_sta,
1399 struct ieee80211_conf *conf,
1400 struct ieee80211_sta *sta, int index)
1401 {
1402 u8 is_green = lq_sta->is_green;
1403 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1404 struct iwl_scale_tbl_info *search_tbl =
1405 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1406 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1407 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1408 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1409 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1410 u8 start_action = tbl->action;
1411 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1412 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1413 u8 update_search_tbl_counter = 0;
1414 int ret;
1415
1416 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1417 tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1418 /* stay in SISO */
1419 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1420 }
1421 for (;;) {
1422 lq_sta->action_counter++;
1423 switch (tbl->action) {
1424 case IWL_SISO_SWITCH_ANTENNA1:
1425 case IWL_SISO_SWITCH_ANTENNA2:
1426 IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1427
1428 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1429 tx_chains_num <= 1) ||
1430 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1431 tx_chains_num <= 2))
1432 break;
1433
1434 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1435 break;
1436
1437 memcpy(search_tbl, tbl, sz);
1438 if (rs_toggle_antenna(valid_tx_ant,
1439 &search_tbl->current_rate, search_tbl)) {
1440 update_search_tbl_counter = 1;
1441 goto out;
1442 }
1443 break;
1444 case IWL_SISO_SWITCH_MIMO2_AB:
1445 case IWL_SISO_SWITCH_MIMO2_AC:
1446 case IWL_SISO_SWITCH_MIMO2_BC:
1447 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1448 memcpy(search_tbl, tbl, sz);
1449 search_tbl->is_SGI = 0;
1450
1451 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1452 search_tbl->ant_type = ANT_AB;
1453 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1454 search_tbl->ant_type = ANT_AC;
1455 else
1456 search_tbl->ant_type = ANT_BC;
1457
1458 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1459 break;
1460
1461 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1462 search_tbl, index);
1463 if (!ret)
1464 goto out;
1465 break;
1466 case IWL_SISO_SWITCH_GI:
1467 if (!tbl->is_ht40 && !(ht_cap->cap &
1468 IEEE80211_HT_CAP_SGI_20))
1469 break;
1470 if (tbl->is_ht40 && !(ht_cap->cap &
1471 IEEE80211_HT_CAP_SGI_40))
1472 break;
1473
1474 IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1475
1476 memcpy(search_tbl, tbl, sz);
1477 if (is_green) {
1478 if (!tbl->is_SGI)
1479 break;
1480 else
1481 IWL_ERR(priv,
1482 "SGI was set in GF+SISO\n");
1483 }
1484 search_tbl->is_SGI = !tbl->is_SGI;
1485 rs_set_expected_tpt_table(lq_sta, search_tbl);
1486 if (tbl->is_SGI) {
1487 s32 tpt = lq_sta->last_tpt / 100;
1488 if (tpt >= search_tbl->expected_tpt[index])
1489 break;
1490 }
1491 search_tbl->current_rate =
1492 rate_n_flags_from_tbl(priv, search_tbl,
1493 index, is_green);
1494 update_search_tbl_counter = 1;
1495 goto out;
1496 case IWL_SISO_SWITCH_MIMO3_ABC:
1497 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1498 memcpy(search_tbl, tbl, sz);
1499 search_tbl->is_SGI = 0;
1500 search_tbl->ant_type = ANT_ABC;
1501
1502 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1503 break;
1504
1505 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1506 search_tbl, index);
1507 if (!ret)
1508 goto out;
1509 break;
1510 }
1511 tbl->action++;
1512 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1513 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1514
1515 if (tbl->action == start_action)
1516 break;
1517 }
1518 search_tbl->lq_type = LQ_NONE;
1519 return 0;
1520
1521 out:
1522 lq_sta->search_better_tbl = 1;
1523 tbl->action++;
1524 if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1525 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1526 if (update_search_tbl_counter)
1527 search_tbl->action = tbl->action;
1528
1529 return 0;
1530 }
1531
1532 /*
1533 * Try to switch to new modulation mode from MIMO2
1534 */
1535 static int rs_move_mimo2_to_other(struct iwl_priv *priv,
1536 struct iwl_lq_sta *lq_sta,
1537 struct ieee80211_conf *conf,
1538 struct ieee80211_sta *sta, int index)
1539 {
1540 s8 is_green = lq_sta->is_green;
1541 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1542 struct iwl_scale_tbl_info *search_tbl =
1543 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1544 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1545 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1546 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1547 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1548 u8 start_action = tbl->action;
1549 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1550 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1551 u8 update_search_tbl_counter = 0;
1552 int ret;
1553
1554 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1555 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1556 tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1557 /* switch in SISO */
1558 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1559 }
1560 for (;;) {
1561 lq_sta->action_counter++;
1562 switch (tbl->action) {
1563 case IWL_MIMO2_SWITCH_ANTENNA1:
1564 case IWL_MIMO2_SWITCH_ANTENNA2:
1565 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1566
1567 if (tx_chains_num <= 2)
1568 break;
1569
1570 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1571 break;
1572
1573 memcpy(search_tbl, tbl, sz);
1574 if (rs_toggle_antenna(valid_tx_ant,
1575 &search_tbl->current_rate, search_tbl)) {
1576 update_search_tbl_counter = 1;
1577 goto out;
1578 }
1579 break;
1580 case IWL_MIMO2_SWITCH_SISO_A:
1581 case IWL_MIMO2_SWITCH_SISO_B:
1582 case IWL_MIMO2_SWITCH_SISO_C:
1583 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1584
1585 /* Set up new search table for SISO */
1586 memcpy(search_tbl, tbl, sz);
1587
1588 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1589 search_tbl->ant_type = ANT_A;
1590 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1591 search_tbl->ant_type = ANT_B;
1592 else
1593 search_tbl->ant_type = ANT_C;
1594
1595 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1596 break;
1597
1598 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1599 search_tbl, index);
1600 if (!ret)
1601 goto out;
1602
1603 break;
1604
1605 case IWL_MIMO2_SWITCH_GI:
1606 if (!tbl->is_ht40 && !(ht_cap->cap &
1607 IEEE80211_HT_CAP_SGI_20))
1608 break;
1609 if (tbl->is_ht40 && !(ht_cap->cap &
1610 IEEE80211_HT_CAP_SGI_40))
1611 break;
1612
1613 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1614
1615 /* Set up new search table for MIMO2 */
1616 memcpy(search_tbl, tbl, sz);
1617 search_tbl->is_SGI = !tbl->is_SGI;
1618 rs_set_expected_tpt_table(lq_sta, search_tbl);
1619 /*
1620 * If active table already uses the fastest possible
1621 * modulation (dual stream with short guard interval),
1622 * and it's working well, there's no need to look
1623 * for a better type of modulation!
1624 */
1625 if (tbl->is_SGI) {
1626 s32 tpt = lq_sta->last_tpt / 100;
1627 if (tpt >= search_tbl->expected_tpt[index])
1628 break;
1629 }
1630 search_tbl->current_rate =
1631 rate_n_flags_from_tbl(priv, search_tbl,
1632 index, is_green);
1633 update_search_tbl_counter = 1;
1634 goto out;
1635
1636 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1637 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1638 memcpy(search_tbl, tbl, sz);
1639 search_tbl->is_SGI = 0;
1640 search_tbl->ant_type = ANT_ABC;
1641
1642 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1643 break;
1644
1645 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1646 search_tbl, index);
1647 if (!ret)
1648 goto out;
1649
1650 break;
1651 }
1652 tbl->action++;
1653 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1654 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1655
1656 if (tbl->action == start_action)
1657 break;
1658 }
1659 search_tbl->lq_type = LQ_NONE;
1660 return 0;
1661 out:
1662 lq_sta->search_better_tbl = 1;
1663 tbl->action++;
1664 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1665 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1666 if (update_search_tbl_counter)
1667 search_tbl->action = tbl->action;
1668
1669 return 0;
1670
1671 }
1672
1673 /*
1674 * Try to switch to new modulation mode from MIMO3
1675 */
1676 static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1677 struct iwl_lq_sta *lq_sta,
1678 struct ieee80211_conf *conf,
1679 struct ieee80211_sta *sta, int index)
1680 {
1681 s8 is_green = lq_sta->is_green;
1682 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1683 struct iwl_scale_tbl_info *search_tbl =
1684 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1685 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1686 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1687 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1688 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1689 u8 start_action = tbl->action;
1690 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1691 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1692 int ret;
1693 u8 update_search_tbl_counter = 0;
1694
1695 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1696 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1697 tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1698 /* switch in SISO */
1699 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1700 }
1701 for (;;) {
1702 lq_sta->action_counter++;
1703 switch (tbl->action) {
1704 case IWL_MIMO3_SWITCH_ANTENNA1:
1705 case IWL_MIMO3_SWITCH_ANTENNA2:
1706 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
1707
1708 if (tx_chains_num <= 3)
1709 break;
1710
1711 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1712 break;
1713
1714 memcpy(search_tbl, tbl, sz);
1715 if (rs_toggle_antenna(valid_tx_ant,
1716 &search_tbl->current_rate, search_tbl))
1717 goto out;
1718 break;
1719 case IWL_MIMO3_SWITCH_SISO_A:
1720 case IWL_MIMO3_SWITCH_SISO_B:
1721 case IWL_MIMO3_SWITCH_SISO_C:
1722 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
1723
1724 /* Set up new search table for SISO */
1725 memcpy(search_tbl, tbl, sz);
1726
1727 if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
1728 search_tbl->ant_type = ANT_A;
1729 else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
1730 search_tbl->ant_type = ANT_B;
1731 else
1732 search_tbl->ant_type = ANT_C;
1733
1734 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1735 break;
1736
1737 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1738 search_tbl, index);
1739 if (!ret)
1740 goto out;
1741
1742 break;
1743
1744 case IWL_MIMO3_SWITCH_MIMO2_AB:
1745 case IWL_MIMO3_SWITCH_MIMO2_AC:
1746 case IWL_MIMO3_SWITCH_MIMO2_BC:
1747 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
1748
1749 memcpy(search_tbl, tbl, sz);
1750 search_tbl->is_SGI = 0;
1751 if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
1752 search_tbl->ant_type = ANT_AB;
1753 else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
1754 search_tbl->ant_type = ANT_AC;
1755 else
1756 search_tbl->ant_type = ANT_BC;
1757
1758 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1759 break;
1760
1761 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1762 search_tbl, index);
1763 if (!ret)
1764 goto out;
1765
1766 break;
1767
1768 case IWL_MIMO3_SWITCH_GI:
1769 if (!tbl->is_ht40 && !(ht_cap->cap &
1770 IEEE80211_HT_CAP_SGI_20))
1771 break;
1772 if (tbl->is_ht40 && !(ht_cap->cap &
1773 IEEE80211_HT_CAP_SGI_40))
1774 break;
1775
1776 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
1777
1778 /* Set up new search table for MIMO */
1779 memcpy(search_tbl, tbl, sz);
1780 search_tbl->is_SGI = !tbl->is_SGI;
1781 rs_set_expected_tpt_table(lq_sta, search_tbl);
1782 /*
1783 * If active table already uses the fastest possible
1784 * modulation (dual stream with short guard interval),
1785 * and it's working well, there's no need to look
1786 * for a better type of modulation!
1787 */
1788 if (tbl->is_SGI) {
1789 s32 tpt = lq_sta->last_tpt / 100;
1790 if (tpt >= search_tbl->expected_tpt[index])
1791 break;
1792 }
1793 search_tbl->current_rate =
1794 rate_n_flags_from_tbl(priv, search_tbl,
1795 index, is_green);
1796 update_search_tbl_counter = 1;
1797 goto out;
1798 }
1799 tbl->action++;
1800 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1801 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1802
1803 if (tbl->action == start_action)
1804 break;
1805 }
1806 search_tbl->lq_type = LQ_NONE;
1807 return 0;
1808 out:
1809 lq_sta->search_better_tbl = 1;
1810 tbl->action++;
1811 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1812 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1813 if (update_search_tbl_counter)
1814 search_tbl->action = tbl->action;
1815
1816 return 0;
1817
1818 }
1819
1820 /*
1821 * Check whether we should continue using same modulation mode, or
1822 * begin search for a new mode, based on:
1823 * 1) # tx successes or failures while using this mode
1824 * 2) # times calling this function
1825 * 3) elapsed time in this mode (not used, for now)
1826 */
1827 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta)
1828 {
1829 struct iwl_scale_tbl_info *tbl;
1830 int i;
1831 int active_tbl;
1832 int flush_interval_passed = 0;
1833 struct iwl_priv *priv;
1834
1835 priv = lq_sta->drv;
1836 active_tbl = lq_sta->active_tbl;
1837
1838 tbl = &(lq_sta->lq_info[active_tbl]);
1839
1840 /* If we've been disallowing search, see if we should now allow it */
1841 if (lq_sta->stay_in_tbl) {
1842
1843 /* Elapsed time using current modulation mode */
1844 if (lq_sta->flush_timer)
1845 flush_interval_passed =
1846 time_after(jiffies,
1847 (unsigned long)(lq_sta->flush_timer +
1848 IWL_RATE_SCALE_FLUSH_INTVL));
1849
1850 /*
1851 * Check if we should allow search for new modulation mode.
1852 * If many frames have failed or succeeded, or we've used
1853 * this same modulation for a long time, allow search, and
1854 * reset history stats that keep track of whether we should
1855 * allow a new search. Also (below) reset all bitmaps and
1856 * stats in active history.
1857 */
1858 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1859 (lq_sta->total_success > lq_sta->max_success_limit) ||
1860 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1861 && (flush_interval_passed))) {
1862 IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n:",
1863 lq_sta->total_failed,
1864 lq_sta->total_success,
1865 flush_interval_passed);
1866
1867 /* Allow search for new mode */
1868 lq_sta->stay_in_tbl = 0; /* only place reset */
1869 lq_sta->total_failed = 0;
1870 lq_sta->total_success = 0;
1871 lq_sta->flush_timer = 0;
1872
1873 /*
1874 * Else if we've used this modulation mode enough repetitions
1875 * (regardless of elapsed time or success/failure), reset
1876 * history bitmaps and rate-specific stats for all rates in
1877 * active table.
1878 */
1879 } else {
1880 lq_sta->table_count++;
1881 if (lq_sta->table_count >=
1882 lq_sta->table_count_limit) {
1883 lq_sta->table_count = 0;
1884
1885 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
1886 for (i = 0; i < IWL_RATE_COUNT; i++)
1887 rs_rate_scale_clear_window(
1888 &(tbl->win[i]));
1889 }
1890 }
1891
1892 /* If transitioning to allow "search", reset all history
1893 * bitmaps and stats in active table (this will become the new
1894 * "search" table). */
1895 if (!lq_sta->stay_in_tbl) {
1896 for (i = 0; i < IWL_RATE_COUNT; i++)
1897 rs_rate_scale_clear_window(&(tbl->win[i]));
1898 }
1899 }
1900 }
1901
1902 /*
1903 * setup rate table in uCode
1904 * return rate_n_flags as used in the table
1905 */
1906 static u32 rs_update_rate_tbl(struct iwl_priv *priv,
1907 struct iwl_lq_sta *lq_sta,
1908 struct iwl_scale_tbl_info *tbl,
1909 int index, u8 is_green)
1910 {
1911 u32 rate;
1912
1913 /* Update uCode's rate table. */
1914 rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
1915 rs_fill_link_cmd(priv, lq_sta, rate);
1916 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1917
1918 return rate;
1919 }
1920
1921 /*
1922 * Do rate scaling and search for new modulation mode.
1923 */
1924 static void rs_rate_scale_perform(struct iwl_priv *priv,
1925 struct sk_buff *skb,
1926 struct ieee80211_sta *sta,
1927 struct iwl_lq_sta *lq_sta)
1928 {
1929 struct ieee80211_hw *hw = priv->hw;
1930 struct ieee80211_conf *conf = &hw->conf;
1931 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1932 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1933 int low = IWL_RATE_INVALID;
1934 int high = IWL_RATE_INVALID;
1935 int index;
1936 int i;
1937 struct iwl_rate_scale_data *window = NULL;
1938 int current_tpt = IWL_INVALID_VALUE;
1939 int low_tpt = IWL_INVALID_VALUE;
1940 int high_tpt = IWL_INVALID_VALUE;
1941 u32 fail_count;
1942 s8 scale_action = 0;
1943 u16 rate_mask;
1944 u8 update_lq = 0;
1945 struct iwl_scale_tbl_info *tbl, *tbl1;
1946 u16 rate_scale_index_msk = 0;
1947 u32 rate;
1948 u8 is_green = 0;
1949 u8 active_tbl = 0;
1950 u8 done_search = 0;
1951 u16 high_low;
1952 s32 sr;
1953 u8 tid = MAX_TID_COUNT;
1954 struct iwl_tid_data *tid_data;
1955
1956 IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
1957
1958 /* Send management frames and NO_ACK data using lowest rate. */
1959 /* TODO: this could probably be improved.. */
1960 if (!ieee80211_is_data(hdr->frame_control) ||
1961 info->flags & IEEE80211_TX_CTL_NO_ACK)
1962 return;
1963
1964 if (!sta || !lq_sta)
1965 return;
1966
1967 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
1968
1969 tid = rs_tl_add_packet(lq_sta, hdr);
1970 if ((tid != MAX_TID_COUNT) && (lq_sta->tx_agg_tid_en & (1 << tid))) {
1971 tid_data = &priv->stations[lq_sta->lq.sta_id].tid[tid];
1972 if (tid_data->agg.state == IWL_AGG_OFF)
1973 lq_sta->is_agg = 0;
1974 else
1975 lq_sta->is_agg = 1;
1976 } else
1977 lq_sta->is_agg = 0;
1978
1979 /*
1980 * Select rate-scale / modulation-mode table to work with in
1981 * the rest of this function: "search" if searching for better
1982 * modulation mode, or "active" if doing rate scaling within a mode.
1983 */
1984 if (!lq_sta->search_better_tbl)
1985 active_tbl = lq_sta->active_tbl;
1986 else
1987 active_tbl = 1 - lq_sta->active_tbl;
1988
1989 tbl = &(lq_sta->lq_info[active_tbl]);
1990 if (is_legacy(tbl->lq_type))
1991 lq_sta->is_green = 0;
1992 else
1993 lq_sta->is_green = rs_use_green(sta, &priv->current_ht_config);
1994 is_green = lq_sta->is_green;
1995
1996 /* current tx rate */
1997 index = lq_sta->last_txrate_idx;
1998
1999 IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2000 tbl->lq_type);
2001
2002 /* rates available for this association, and for modulation mode */
2003 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2004
2005 IWL_DEBUG_RATE(priv, "mask 0x%04X \n", rate_mask);
2006
2007 /* mask with station rate restriction */
2008 if (is_legacy(tbl->lq_type)) {
2009 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2010 /* supp_rates has no CCK bits in A mode */
2011 rate_scale_index_msk = (u16) (rate_mask &
2012 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2013 else
2014 rate_scale_index_msk = (u16) (rate_mask &
2015 lq_sta->supp_rates);
2016
2017 } else
2018 rate_scale_index_msk = rate_mask;
2019
2020 if (!rate_scale_index_msk)
2021 rate_scale_index_msk = rate_mask;
2022
2023 if (!((1 << index) & rate_scale_index_msk)) {
2024 IWL_ERR(priv, "Current Rate is not valid\n");
2025 if (lq_sta->search_better_tbl) {
2026 /* revert to active table if search table is not valid*/
2027 tbl->lq_type = LQ_NONE;
2028 lq_sta->search_better_tbl = 0;
2029 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2030 /* get "active" rate info */
2031 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2032 rate = rs_update_rate_tbl(priv, lq_sta,
2033 tbl, index, is_green);
2034 }
2035 return;
2036 }
2037
2038 /* Get expected throughput table and history window for current rate */
2039 if (!tbl->expected_tpt) {
2040 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2041 return;
2042 }
2043
2044 /* force user max rate if set by user */
2045 if ((lq_sta->max_rate_idx != -1) &&
2046 (lq_sta->max_rate_idx < index)) {
2047 index = lq_sta->max_rate_idx;
2048 update_lq = 1;
2049 window = &(tbl->win[index]);
2050 goto lq_update;
2051 }
2052
2053 window = &(tbl->win[index]);
2054
2055 /*
2056 * If there is not enough history to calculate actual average
2057 * throughput, keep analyzing results of more tx frames, without
2058 * changing rate or mode (bypass most of the rest of this function).
2059 * Set up new rate table in uCode only if old rate is not supported
2060 * in current association (use new rate found above).
2061 */
2062 fail_count = window->counter - window->success_counter;
2063 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2064 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2065 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2066 "for index %d\n",
2067 window->success_counter, window->counter, index);
2068
2069 /* Can't calculate this yet; not enough history */
2070 window->average_tpt = IWL_INVALID_VALUE;
2071
2072 /* Should we stay with this modulation mode,
2073 * or search for a new one? */
2074 rs_stay_in_table(lq_sta);
2075
2076 goto out;
2077 }
2078 /* Else we have enough samples; calculate estimate of
2079 * actual average throughput */
2080
2081 /* Sanity-check TPT calculations */
2082 BUG_ON(window->average_tpt != ((window->success_ratio *
2083 tbl->expected_tpt[index] + 64) / 128));
2084
2085 /* If we are searching for better modulation mode, check success. */
2086 if (lq_sta->search_better_tbl &&
2087 (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
2088 /* If good success, continue using the "search" mode;
2089 * no need to send new link quality command, since we're
2090 * continuing to use the setup that we've been trying. */
2091 if (window->average_tpt > lq_sta->last_tpt) {
2092
2093 IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2094 "suc=%d cur-tpt=%d old-tpt=%d\n",
2095 window->success_ratio,
2096 window->average_tpt,
2097 lq_sta->last_tpt);
2098
2099 if (!is_legacy(tbl->lq_type))
2100 lq_sta->enable_counter = 1;
2101
2102 /* Swap tables; "search" becomes "active" */
2103 lq_sta->active_tbl = active_tbl;
2104 current_tpt = window->average_tpt;
2105
2106 /* Else poor success; go back to mode in "active" table */
2107 } else {
2108
2109 IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2110 "suc=%d cur-tpt=%d old-tpt=%d\n",
2111 window->success_ratio,
2112 window->average_tpt,
2113 lq_sta->last_tpt);
2114
2115 /* Nullify "search" table */
2116 tbl->lq_type = LQ_NONE;
2117
2118 /* Revert to "active" table */
2119 active_tbl = lq_sta->active_tbl;
2120 tbl = &(lq_sta->lq_info[active_tbl]);
2121
2122 /* Revert to "active" rate and throughput info */
2123 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2124 current_tpt = lq_sta->last_tpt;
2125
2126 /* Need to set up a new rate table in uCode */
2127 update_lq = 1;
2128 }
2129
2130 /* Either way, we've made a decision; modulation mode
2131 * search is done, allow rate adjustment next time. */
2132 lq_sta->search_better_tbl = 0;
2133 done_search = 1; /* Don't switch modes below! */
2134 goto lq_update;
2135 }
2136
2137 /* (Else) not in search of better modulation mode, try for better
2138 * starting rate, while staying in this mode. */
2139 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2140 tbl->lq_type);
2141 low = high_low & 0xff;
2142 high = (high_low >> 8) & 0xff;
2143
2144 /* If user set max rate, dont allow higher than user constrain */
2145 if ((lq_sta->max_rate_idx != -1) &&
2146 (lq_sta->max_rate_idx < high))
2147 high = IWL_RATE_INVALID;
2148
2149 sr = window->success_ratio;
2150
2151 /* Collect measured throughputs for current and adjacent rates */
2152 current_tpt = window->average_tpt;
2153 if (low != IWL_RATE_INVALID)
2154 low_tpt = tbl->win[low].average_tpt;
2155 if (high != IWL_RATE_INVALID)
2156 high_tpt = tbl->win[high].average_tpt;
2157
2158 scale_action = 0;
2159
2160 /* Too many failures, decrease rate */
2161 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2162 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2163 scale_action = -1;
2164
2165 /* No throughput measured yet for adjacent rates; try increase. */
2166 } else if ((low_tpt == IWL_INVALID_VALUE) &&
2167 (high_tpt == IWL_INVALID_VALUE)) {
2168
2169 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2170 scale_action = 1;
2171 else if (low != IWL_RATE_INVALID)
2172 scale_action = 0;
2173 }
2174
2175 /* Both adjacent throughputs are measured, but neither one has better
2176 * throughput; we're using the best rate, don't change it! */
2177 else if ((low_tpt != IWL_INVALID_VALUE) &&
2178 (high_tpt != IWL_INVALID_VALUE) &&
2179 (low_tpt < current_tpt) &&
2180 (high_tpt < current_tpt))
2181 scale_action = 0;
2182
2183 /* At least one adjacent rate's throughput is measured,
2184 * and may have better performance. */
2185 else {
2186 /* Higher adjacent rate's throughput is measured */
2187 if (high_tpt != IWL_INVALID_VALUE) {
2188 /* Higher rate has better throughput */
2189 if (high_tpt > current_tpt &&
2190 sr >= IWL_RATE_INCREASE_TH) {
2191 scale_action = 1;
2192 } else {
2193 scale_action = 0;
2194 }
2195
2196 /* Lower adjacent rate's throughput is measured */
2197 } else if (low_tpt != IWL_INVALID_VALUE) {
2198 /* Lower rate has better throughput */
2199 if (low_tpt > current_tpt) {
2200 IWL_DEBUG_RATE(priv,
2201 "decrease rate because of low tpt\n");
2202 scale_action = -1;
2203 } else if (sr >= IWL_RATE_INCREASE_TH) {
2204 scale_action = 1;
2205 }
2206 }
2207 }
2208
2209 /* Sanity check; asked for decrease, but success rate or throughput
2210 * has been good at old rate. Don't change it. */
2211 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2212 ((sr > IWL_RATE_HIGH_TH) ||
2213 (current_tpt > (100 * tbl->expected_tpt[low]))))
2214 scale_action = 0;
2215 if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2216 scale_action = -1;
2217 if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
2218 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2219 scale_action = -1;
2220 switch (scale_action) {
2221 case -1:
2222 /* Decrease starting rate, update uCode's rate table */
2223 if (low != IWL_RATE_INVALID) {
2224 update_lq = 1;
2225 index = low;
2226 }
2227
2228 break;
2229 case 1:
2230 /* Increase starting rate, update uCode's rate table */
2231 if (high != IWL_RATE_INVALID) {
2232 update_lq = 1;
2233 index = high;
2234 }
2235
2236 break;
2237 case 0:
2238 /* No change */
2239 default:
2240 break;
2241 }
2242
2243 IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2244 "high %d type %d\n",
2245 index, scale_action, low, high, tbl->lq_type);
2246
2247 lq_update:
2248 /* Replace uCode's rate table for the destination station. */
2249 if (update_lq)
2250 rate = rs_update_rate_tbl(priv, lq_sta,
2251 tbl, index, is_green);
2252
2253 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
2254 /* Should we stay with this modulation mode,
2255 * or search for a new one? */
2256 rs_stay_in_table(lq_sta);
2257 }
2258 /*
2259 * Search for new modulation mode if we're:
2260 * 1) Not changing rates right now
2261 * 2) Not just finishing up a search
2262 * 3) Allowing a new search
2263 */
2264 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2265 /* Save current throughput to compare with "search" throughput*/
2266 lq_sta->last_tpt = current_tpt;
2267
2268 /* Select a new "search" modulation mode to try.
2269 * If one is found, set up the new "search" table. */
2270 if (is_legacy(tbl->lq_type))
2271 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2272 else if (is_siso(tbl->lq_type))
2273 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2274 else if (is_mimo2(tbl->lq_type))
2275 rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2276 else
2277 rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2278
2279 /* If new "search" mode was selected, set up in uCode table */
2280 if (lq_sta->search_better_tbl) {
2281 /* Access the "search" table, clear its history. */
2282 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2283 for (i = 0; i < IWL_RATE_COUNT; i++)
2284 rs_rate_scale_clear_window(&(tbl->win[i]));
2285
2286 /* Use new "search" start rate */
2287 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2288
2289 IWL_DEBUG_RATE(priv, "Switch current mcs: %X index: %d\n",
2290 tbl->current_rate, index);
2291 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2292 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2293 } else
2294 done_search = 1;
2295 }
2296
2297 if (done_search && !lq_sta->stay_in_tbl) {
2298 /* If the "active" (non-search) mode was legacy,
2299 * and we've tried switching antennas,
2300 * but we haven't been able to try HT modes (not available),
2301 * stay with best antenna legacy modulation for a while
2302 * before next round of mode comparisons. */
2303 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2304 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2305 lq_sta->action_counter > tbl1->max_search) {
2306 IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2307 rs_set_stay_in_table(priv, 1, lq_sta);
2308 }
2309
2310 /* If we're in an HT mode, and all 3 mode switch actions
2311 * have been tried and compared, stay in this best modulation
2312 * mode for a while before next round of mode comparisons. */
2313 if (lq_sta->enable_counter &&
2314 (lq_sta->action_counter >= tbl1->max_search) &&
2315 iwl_ht_enabled(priv)) {
2316 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2317 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2318 (tid != MAX_TID_COUNT)) {
2319 tid_data =
2320 &priv->stations[lq_sta->lq.sta_id].tid[tid];
2321 if (tid_data->agg.state == IWL_AGG_OFF) {
2322 IWL_DEBUG_RATE(priv,
2323 "try to aggregate tid %d\n",
2324 tid);
2325 rs_tl_turn_on_agg(priv, tid,
2326 lq_sta, sta);
2327 }
2328 }
2329 rs_set_stay_in_table(priv, 0, lq_sta);
2330 }
2331 }
2332
2333 out:
2334 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2335 i = index;
2336 lq_sta->last_txrate_idx = i;
2337
2338 return;
2339 }
2340
2341
2342 static void rs_initialize_lq(struct iwl_priv *priv,
2343 struct ieee80211_conf *conf,
2344 struct ieee80211_sta *sta,
2345 struct iwl_lq_sta *lq_sta)
2346 {
2347 struct iwl_scale_tbl_info *tbl;
2348 int rate_idx;
2349 int i;
2350 u32 rate;
2351 u8 use_green = rs_use_green(sta, &priv->current_ht_config);
2352 u8 active_tbl = 0;
2353 u8 valid_tx_ant;
2354
2355 if (!sta || !lq_sta)
2356 goto out;
2357
2358 i = lq_sta->last_txrate_idx;
2359
2360 if ((lq_sta->lq.sta_id == 0xff) &&
2361 (priv->iw_mode == NL80211_IFTYPE_ADHOC))
2362 goto out;
2363
2364 valid_tx_ant = priv->hw_params.valid_tx_ant;
2365
2366 if (!lq_sta->search_better_tbl)
2367 active_tbl = lq_sta->active_tbl;
2368 else
2369 active_tbl = 1 - lq_sta->active_tbl;
2370
2371 tbl = &(lq_sta->lq_info[active_tbl]);
2372
2373 if ((i < 0) || (i >= IWL_RATE_COUNT))
2374 i = 0;
2375
2376 rate = iwl_rates[i].plcp;
2377 tbl->ant_type = first_antenna(valid_tx_ant);
2378 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2379
2380 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2381 rate |= RATE_MCS_CCK_MSK;
2382
2383 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2384 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2385 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2386
2387 rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2388 tbl->current_rate = rate;
2389 rs_set_expected_tpt_table(lq_sta, tbl);
2390 rs_fill_link_cmd(NULL, lq_sta, rate);
2391 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2392 out:
2393 return;
2394 }
2395
2396 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2397 struct ieee80211_tx_rate_control *txrc)
2398 {
2399
2400 struct sk_buff *skb = txrc->skb;
2401 struct ieee80211_supported_band *sband = txrc->sband;
2402 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2403 struct ieee80211_conf *conf = &priv->hw->conf;
2404 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2405 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2406 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2407 struct iwl_lq_sta *lq_sta = priv_sta;
2408 int rate_idx;
2409
2410 IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2411
2412 /* Get max rate if user set max rate */
2413 if (lq_sta) {
2414 lq_sta->max_rate_idx = txrc->max_rate_idx;
2415 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2416 (lq_sta->max_rate_idx != -1))
2417 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2418 if ((lq_sta->max_rate_idx < 0) ||
2419 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2420 lq_sta->max_rate_idx = -1;
2421 }
2422
2423 /* Send management frames and NO_ACK data using lowest rate. */
2424 if (rate_control_send_low(sta, priv_sta, txrc))
2425 return;
2426
2427 rate_idx = lq_sta->last_txrate_idx;
2428
2429 if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
2430 !lq_sta->ibss_sta_added) {
2431 u8 sta_id = iwl_find_station(priv, hdr->addr1);
2432
2433 if (sta_id == IWL_INVALID_STATION) {
2434 IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n",
2435 hdr->addr1);
2436 sta_id = iwl_add_station(priv, hdr->addr1,
2437 false, CMD_ASYNC, ht_cap);
2438 }
2439 if ((sta_id != IWL_INVALID_STATION)) {
2440 lq_sta->lq.sta_id = sta_id;
2441 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2442 lq_sta->ibss_sta_added = 1;
2443 rs_initialize_lq(priv, conf, sta, lq_sta);
2444 }
2445 }
2446
2447 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2448 rate_idx -= IWL_FIRST_OFDM_RATE;
2449 /* 6M and 9M shared same MCS index */
2450 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2451 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2452 IWL_RATE_MIMO3_6M_PLCP)
2453 rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2454 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2455 IWL_RATE_MIMO2_6M_PLCP)
2456 rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2457 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2458 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2459 info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2460 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2461 info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
2462 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2463 info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2464 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2465 info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2466 } else {
2467 /* Check for invalid rates */
2468 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2469 ((sband->band == IEEE80211_BAND_5GHZ) &&
2470 (rate_idx < IWL_FIRST_OFDM_RATE)))
2471 rate_idx = rate_lowest_index(sband, sta);
2472 /* On valid 5 GHz rate, adjust index */
2473 else if (sband->band == IEEE80211_BAND_5GHZ)
2474 rate_idx -= IWL_FIRST_OFDM_RATE;
2475 info->control.rates[0].flags = 0;
2476 }
2477 info->control.rates[0].idx = rate_idx;
2478
2479 }
2480
2481 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2482 gfp_t gfp)
2483 {
2484 struct iwl_lq_sta *lq_sta;
2485 struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2486 struct iwl_priv *priv;
2487
2488 priv = (struct iwl_priv *)priv_rate;
2489 IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2490
2491 lq_sta = &sta_priv->lq_sta;
2492
2493 return lq_sta;
2494 }
2495
2496 static void rs_rate_init(void *priv_r, struct ieee80211_supported_band *sband,
2497 struct ieee80211_sta *sta, void *priv_sta)
2498 {
2499 int i, j;
2500 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2501 struct ieee80211_conf *conf = &priv->hw->conf;
2502 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2503 struct iwl_lq_sta *lq_sta = priv_sta;
2504
2505 lq_sta->lq.sta_id = 0xff;
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 ***\n");
2518 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2519 * the lowest or the highest rate.. Could consider using RSSI from
2520 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2521 * after assoc.. */
2522
2523 lq_sta->ibss_sta_added = 0;
2524 if (priv->iw_mode == NL80211_IFTYPE_AP) {
2525 u8 sta_id = iwl_find_station(priv,
2526 sta->addr);
2527
2528 /* for IBSS the call are from tasklet */
2529 IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n", sta->addr);
2530
2531 if (sta_id == IWL_INVALID_STATION) {
2532 IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n", sta->addr);
2533 sta_id = iwl_add_station(priv, sta->addr, false,
2534 CMD_ASYNC, ht_cap);
2535 }
2536 if ((sta_id != IWL_INVALID_STATION)) {
2537 lq_sta->lq.sta_id = sta_id;
2538 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2539 }
2540 /* FIXME: this is w/a remove it later */
2541 priv->assoc_station_added = 1;
2542 }
2543
2544 lq_sta->is_dup = 0;
2545 lq_sta->max_rate_idx = -1;
2546 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2547 lq_sta->is_green = rs_use_green(sta, &priv->current_ht_config);
2548 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2549 lq_sta->active_rate_basic = priv->active_rate_basic;
2550 lq_sta->band = priv->band;
2551 /*
2552 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2553 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2554 */
2555 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2556 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2557 lq_sta->active_siso_rate &= ~((u16)0x2);
2558 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2559
2560 /* Same here */
2561 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2562 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2563 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2564 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2565
2566 lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2567 lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2568 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2569 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2570
2571 IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2572 lq_sta->active_siso_rate,
2573 lq_sta->active_mimo2_rate,
2574 lq_sta->active_mimo3_rate);
2575
2576 /* These values will be overridden later */
2577 lq_sta->lq.general_params.single_stream_ant_msk = ANT_A;
2578 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2579
2580 /* as default allow aggregation for all tids */
2581 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2582 lq_sta->drv = priv;
2583
2584 /* Set last_txrate_idx to lowest rate */
2585 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2586 if (sband->band == IEEE80211_BAND_5GHZ)
2587 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2588 lq_sta->is_agg = 0;
2589
2590 rs_initialize_lq(priv, conf, sta, lq_sta);
2591 }
2592
2593 static void rs_fill_link_cmd(struct iwl_priv *priv,
2594 struct iwl_lq_sta *lq_sta, u32 new_rate)
2595 {
2596 struct iwl_scale_tbl_info tbl_type;
2597 int index = 0;
2598 int rate_idx;
2599 int repeat_rate = 0;
2600 u8 ant_toggle_cnt = 0;
2601 u8 use_ht_possible = 1;
2602 u8 valid_tx_ant = 0;
2603 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2604
2605 /* Override starting rate (index 0) if needed for debug purposes */
2606 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2607
2608 /* Interpret new_rate (rate_n_flags) */
2609 memset(&tbl_type, 0, sizeof(tbl_type));
2610 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2611 &tbl_type, &rate_idx);
2612
2613 /* How many times should we repeat the initial rate? */
2614 if (is_legacy(tbl_type.lq_type)) {
2615 ant_toggle_cnt = 1;
2616 repeat_rate = IWL_NUMBER_TRY;
2617 } else {
2618 repeat_rate = IWL_HT_NUMBER_TRY;
2619 }
2620
2621 lq_cmd->general_params.mimo_delimiter =
2622 is_mimo(tbl_type.lq_type) ? 1 : 0;
2623
2624 /* Fill 1st table entry (index 0) */
2625 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2626
2627 if (num_of_ant(tbl_type.ant_type) == 1) {
2628 lq_cmd->general_params.single_stream_ant_msk =
2629 tbl_type.ant_type;
2630 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2631 lq_cmd->general_params.dual_stream_ant_msk =
2632 tbl_type.ant_type;
2633 } /* otherwise we don't modify the existing value */
2634
2635 index++;
2636 repeat_rate--;
2637
2638 if (priv)
2639 valid_tx_ant = priv->hw_params.valid_tx_ant;
2640
2641 /* Fill rest of rate table */
2642 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2643 /* Repeat initial/next rate.
2644 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2645 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2646 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2647 if (is_legacy(tbl_type.lq_type)) {
2648 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2649 ant_toggle_cnt++;
2650 else if (priv &&
2651 rs_toggle_antenna(valid_tx_ant,
2652 &new_rate, &tbl_type))
2653 ant_toggle_cnt = 1;
2654 }
2655
2656 /* Override next rate if needed for debug purposes */
2657 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2658
2659 /* Fill next table entry */
2660 lq_cmd->rs_table[index].rate_n_flags =
2661 cpu_to_le32(new_rate);
2662 repeat_rate--;
2663 index++;
2664 }
2665
2666 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2667 &rate_idx);
2668
2669 /* Indicate to uCode which entries might be MIMO.
2670 * If initial rate was MIMO, this will finally end up
2671 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2672 if (is_mimo(tbl_type.lq_type))
2673 lq_cmd->general_params.mimo_delimiter = index;
2674
2675 /* Get next rate */
2676 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2677 use_ht_possible);
2678
2679 /* How many times should we repeat the next rate? */
2680 if (is_legacy(tbl_type.lq_type)) {
2681 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2682 ant_toggle_cnt++;
2683 else if (priv &&
2684 rs_toggle_antenna(valid_tx_ant,
2685 &new_rate, &tbl_type))
2686 ant_toggle_cnt = 1;
2687
2688 repeat_rate = IWL_NUMBER_TRY;
2689 } else {
2690 repeat_rate = IWL_HT_NUMBER_TRY;
2691 }
2692
2693 /* Don't allow HT rates after next pass.
2694 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2695 use_ht_possible = 0;
2696
2697 /* Override next rate if needed for debug purposes */
2698 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2699
2700 /* Fill next table entry */
2701 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2702
2703 index++;
2704 repeat_rate--;
2705 }
2706
2707 lq_cmd->agg_params.agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2708 lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2709 lq_cmd->agg_params.agg_time_limit =
2710 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2711 }
2712
2713 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2714 {
2715 return hw->priv;
2716 }
2717 /* rate scale requires free function to be implemented */
2718 static void rs_free(void *priv_rate)
2719 {
2720 return;
2721 }
2722
2723 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
2724 void *priv_sta)
2725 {
2726 struct iwl_priv *priv __maybe_unused = priv_r;
2727
2728 IWL_DEBUG_RATE(priv, "enter\n");
2729 IWL_DEBUG_RATE(priv, "leave\n");
2730 }
2731
2732
2733 #ifdef CONFIG_MAC80211_DEBUGFS
2734 static int open_file_generic(struct inode *inode, struct file *file)
2735 {
2736 file->private_data = inode->i_private;
2737 return 0;
2738 }
2739 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2740 u32 *rate_n_flags, int index)
2741 {
2742 struct iwl_priv *priv;
2743 u8 valid_tx_ant;
2744 u8 ant_sel_tx;
2745
2746 priv = lq_sta->drv;
2747 valid_tx_ant = priv->hw_params.valid_tx_ant;
2748 if (lq_sta->dbg_fixed_rate) {
2749 ant_sel_tx =
2750 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
2751 >> RATE_MCS_ANT_POS);
2752 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
2753 *rate_n_flags = lq_sta->dbg_fixed_rate;
2754 IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
2755 } else {
2756 lq_sta->dbg_fixed_rate = 0;
2757 IWL_ERR(priv,
2758 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
2759 ant_sel_tx, valid_tx_ant);
2760 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
2761 }
2762 } else {
2763 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
2764 }
2765 }
2766
2767 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2768 const char __user *user_buf, size_t count, loff_t *ppos)
2769 {
2770 struct iwl_lq_sta *lq_sta = file->private_data;
2771 struct iwl_priv *priv;
2772 char buf[64];
2773 int buf_size;
2774 u32 parsed_rate;
2775
2776 priv = lq_sta->drv;
2777 memset(buf, 0, sizeof(buf));
2778 buf_size = min(count, sizeof(buf) - 1);
2779 if (copy_from_user(buf, user_buf, buf_size))
2780 return -EFAULT;
2781
2782 if (sscanf(buf, "%x", &parsed_rate) == 1)
2783 lq_sta->dbg_fixed_rate = parsed_rate;
2784 else
2785 lq_sta->dbg_fixed_rate = 0;
2786
2787 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2788 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2789 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2790 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2791
2792 IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
2793 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2794
2795 if (lq_sta->dbg_fixed_rate) {
2796 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2797 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2798 }
2799
2800 return count;
2801 }
2802
2803 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2804 char __user *user_buf, size_t count, loff_t *ppos)
2805 {
2806 char *buff;
2807 int desc = 0;
2808 int i = 0;
2809 int index = 0;
2810 ssize_t ret;
2811
2812 struct iwl_lq_sta *lq_sta = file->private_data;
2813 struct iwl_priv *priv;
2814 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2815
2816 priv = lq_sta->drv;
2817 buff = kmalloc(1024, GFP_KERNEL);
2818 if (!buff)
2819 return -ENOMEM;
2820
2821 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2822 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2823 lq_sta->total_failed, lq_sta->total_success,
2824 lq_sta->active_legacy_rate);
2825 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2826 lq_sta->dbg_fixed_rate);
2827 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
2828 (priv->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
2829 (priv->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
2830 (priv->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
2831 desc += sprintf(buff+desc, "lq type %s\n",
2832 (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
2833 if (is_Ht(tbl->lq_type)) {
2834 desc += sprintf(buff+desc, " %s",
2835 (is_siso(tbl->lq_type)) ? "SISO" :
2836 ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
2837 desc += sprintf(buff+desc, " %s",
2838 (tbl->is_ht40) ? "40MHz" : "20MHz");
2839 desc += sprintf(buff+desc, " %s %s %s\n", (tbl->is_SGI) ? "SGI" : "",
2840 (lq_sta->is_green) ? "GF enabled" : "",
2841 (lq_sta->is_agg) ? "AGG on" : "");
2842 }
2843 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
2844 lq_sta->last_rate_n_flags);
2845 desc += sprintf(buff+desc, "general:"
2846 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2847 lq_sta->lq.general_params.flags,
2848 lq_sta->lq.general_params.mimo_delimiter,
2849 lq_sta->lq.general_params.single_stream_ant_msk,
2850 lq_sta->lq.general_params.dual_stream_ant_msk);
2851
2852 desc += sprintf(buff+desc, "agg:"
2853 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2854 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2855 lq_sta->lq.agg_params.agg_dis_start_th,
2856 lq_sta->lq.agg_params.agg_frame_cnt_limit);
2857
2858 desc += sprintf(buff+desc,
2859 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2860 lq_sta->lq.general_params.start_rate_index[0],
2861 lq_sta->lq.general_params.start_rate_index[1],
2862 lq_sta->lq.general_params.start_rate_index[2],
2863 lq_sta->lq.general_params.start_rate_index[3]);
2864
2865 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2866 index = iwl_hwrate_to_plcp_idx(
2867 le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2868 if (is_legacy(tbl->lq_type)) {
2869 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
2870 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
2871 iwl_rate_mcs[index].mbps);
2872 } else {
2873 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
2874 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
2875 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
2876 }
2877 }
2878
2879 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2880 kfree(buff);
2881 return ret;
2882 }
2883
2884 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2885 .write = rs_sta_dbgfs_scale_table_write,
2886 .read = rs_sta_dbgfs_scale_table_read,
2887 .open = open_file_generic,
2888 };
2889 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2890 char __user *user_buf, size_t count, loff_t *ppos)
2891 {
2892 char *buff;
2893 int desc = 0;
2894 int i, j;
2895 ssize_t ret;
2896
2897 struct iwl_lq_sta *lq_sta = file->private_data;
2898
2899 buff = kmalloc(1024, GFP_KERNEL);
2900 if (!buff)
2901 return -ENOMEM;
2902
2903 for (i = 0; i < LQ_SIZE; i++) {
2904 desc += sprintf(buff+desc,
2905 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
2906 "rate=0x%X\n",
2907 lq_sta->active_tbl == i ? "*" : "x",
2908 lq_sta->lq_info[i].lq_type,
2909 lq_sta->lq_info[i].is_SGI,
2910 lq_sta->lq_info[i].is_ht40,
2911 lq_sta->lq_info[i].is_dup,
2912 lq_sta->is_green,
2913 lq_sta->lq_info[i].current_rate);
2914 for (j = 0; j < IWL_RATE_COUNT; j++) {
2915 desc += sprintf(buff+desc,
2916 "counter=%d success=%d %%=%d\n",
2917 lq_sta->lq_info[i].win[j].counter,
2918 lq_sta->lq_info[i].win[j].success_counter,
2919 lq_sta->lq_info[i].win[j].success_ratio);
2920 }
2921 }
2922 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2923 kfree(buff);
2924 return ret;
2925 }
2926
2927 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2928 .read = rs_sta_dbgfs_stats_table_read,
2929 .open = open_file_generic,
2930 };
2931
2932 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
2933 char __user *user_buf, size_t count, loff_t *ppos)
2934 {
2935 char buff[120];
2936 int desc = 0;
2937 ssize_t ret;
2938
2939 struct iwl_lq_sta *lq_sta = file->private_data;
2940 struct iwl_priv *priv;
2941 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
2942
2943 priv = lq_sta->drv;
2944
2945 if (is_Ht(tbl->lq_type))
2946 desc += sprintf(buff+desc,
2947 "Bit Rate= %d Mb/s\n",
2948 tbl->expected_tpt[lq_sta->last_txrate_idx]);
2949 else
2950 desc += sprintf(buff+desc,
2951 "Bit Rate= %d Mb/s\n",
2952 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
2953 desc += sprintf(buff+desc,
2954 "Signal Level= %d dBm\tNoise Level= %d dBm\n",
2955 priv->last_rx_rssi, priv->last_rx_noise);
2956 desc += sprintf(buff+desc,
2957 "Tsf= 0x%llx\tBeacon time= 0x%08X\n",
2958 priv->last_tsf, priv->last_beacon_time);
2959
2960 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2961 return ret;
2962 }
2963
2964 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
2965 .read = rs_sta_dbgfs_rate_scale_data_read,
2966 .open = open_file_generic,
2967 };
2968
2969 static void rs_add_debugfs(void *priv, void *priv_sta,
2970 struct dentry *dir)
2971 {
2972 struct iwl_lq_sta *lq_sta = priv_sta;
2973 lq_sta->rs_sta_dbgfs_scale_table_file =
2974 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
2975 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2976 lq_sta->rs_sta_dbgfs_stats_table_file =
2977 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
2978 lq_sta, &rs_sta_dbgfs_stats_table_ops);
2979 lq_sta->rs_sta_dbgfs_rate_scale_data_file =
2980 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
2981 lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
2982 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2983 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
2984 &lq_sta->tx_agg_tid_en);
2985
2986 }
2987
2988 static void rs_remove_debugfs(void *priv, void *priv_sta)
2989 {
2990 struct iwl_lq_sta *lq_sta = priv_sta;
2991 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2992 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2993 debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
2994 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2995 }
2996 #endif
2997
2998 static struct rate_control_ops rs_ops = {
2999 .module = NULL,
3000 .name = RS_NAME,
3001 .tx_status = rs_tx_status,
3002 .get_rate = rs_get_rate,
3003 .rate_init = rs_rate_init,
3004 .alloc = rs_alloc,
3005 .free = rs_free,
3006 .alloc_sta = rs_alloc_sta,
3007 .free_sta = rs_free_sta,
3008 #ifdef CONFIG_MAC80211_DEBUGFS
3009 .add_sta_debugfs = rs_add_debugfs,
3010 .remove_sta_debugfs = rs_remove_debugfs,
3011 #endif
3012 };
3013
3014 int iwlagn_rate_control_register(void)
3015 {
3016 return ieee80211_rate_control_register(&rs_ops);
3017 }
3018
3019 void iwlagn_rate_control_unregister(void)
3020 {
3021 ieee80211_rate_control_unregister(&rs_ops);
3022 }
3023
Linux with added FPC-III support