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Merge branch 'master' into for-davem
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / net / wireless / iwlwifi / iwl-agn-rs.c
blob0e6161d7c764e470a8a2cea287c6fb97db0b57a7
1 /******************************************************************************
2 *
3 * Copyright(c) 2005 - 2010 Intel Corporation. All rights reserved.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2 of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
17 *
18 * The full GNU General Public License is included in this distribution in the
19 * file called LICENSE.
20 *
21 * Contact Information:
22 * Intel Linux Wireless <ilw@linux.intel.com>
23 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
24 *
25 *****************************************************************************/
26 #include <linux/kernel.h>
27 #include <linux/init.h>
28 #include <linux/skbuff.h>
29 #include <linux/slab.h>
30 #include <linux/wireless.h>
31 #include <net/mac80211.h>
32
33 #include <linux/netdevice.h>
34 #include <linux/etherdevice.h>
35 #include <linux/delay.h>
36
37 #include <linux/workqueue.h>
38
39 #include "iwl-dev.h"
40 #include "iwl-sta.h"
41 #include "iwl-core.h"
42
43 #define RS_NAME "iwl-agn-rs"
44
45 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
46 #define IWL_NUMBER_TRY 1
47 #define IWL_HT_NUMBER_TRY 3
48
49 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
50 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
51 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
52
53 /* max allowed rate miss before sync LQ cmd */
54 #define IWL_MISSED_RATE_MAX 15
55 /* max time to accum history 2 seconds */
56 #define IWL_RATE_SCALE_FLUSH_INTVL (3*HZ)
57
58 static u8 rs_ht_to_legacy[] = {
59 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
60 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
61 IWL_RATE_6M_INDEX,
62 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
63 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
64 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
65 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
66 };
67
68 static const u8 ant_toggle_lookup[] = {
69 /*ANT_NONE -> */ ANT_NONE,
70 /*ANT_A -> */ ANT_B,
71 /*ANT_B -> */ ANT_C,
72 /*ANT_AB -> */ ANT_BC,
73 /*ANT_C -> */ ANT_A,
74 /*ANT_AC -> */ ANT_AB,
75 /*ANT_BC -> */ ANT_AC,
76 /*ANT_ABC -> */ ANT_ABC,
77 };
78
79 static void rs_rate_scale_perform(struct iwl_priv *priv,
80 struct sk_buff *skb,
81 struct ieee80211_sta *sta,
82 struct iwl_lq_sta *lq_sta);
83 static void rs_fill_link_cmd(struct iwl_priv *priv,
84 struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
85
86
87 #ifdef CONFIG_MAC80211_DEBUGFS
88 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
89 u32 *rate_n_flags, int index);
90 #else
91 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
92 u32 *rate_n_flags, int index)
93 {}
94 #endif
95
96 /**
97 * The following tables contain the expected throughput metrics for all rates
98 *
99 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
100 *
101 * where invalid entries are zeros.
102 *
103 * CCK rates are only valid in legacy table and will only be used in G
104 * (2.4 GHz) band.
105 */
106
107 static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
108 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
109 };
110
111 static s32 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
112 {0, 0, 0, 0, 42, 0, 76, 102, 124, 158, 183, 193, 202}, /* Norm */
113 {0, 0, 0, 0, 46, 0, 82, 110, 132, 167, 192, 202, 210}, /* SGI */
114 {0, 0, 0, 0, 48, 0, 93, 135, 176, 251, 319, 351, 381}, /* AGG */
115 {0, 0, 0, 0, 53, 0, 102, 149, 193, 275, 348, 381, 413}, /* AGG+SGI */
116 };
117
118 static s32 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
119 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
120 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
121 {0, 0, 0, 0, 96, 0, 182, 259, 328, 451, 553, 598, 640}, /* AGG */
122 {0, 0, 0, 0, 106, 0, 199, 282, 357, 487, 593, 640, 683}, /* AGG+SGI */
123 };
124
125 static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
126 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250}, /* Norm */
127 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256}, /* SGI */
128 {0, 0, 0, 0, 92, 0, 175, 250, 317, 436, 534, 578, 619}, /* AGG */
129 {0, 0, 0, 0, 102, 0, 192, 273, 344, 470, 573, 619, 660}, /* AGG+SGI*/
130 };
131
132 static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
133 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
134 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
135 {0, 0, 0, 0, 180, 0, 327, 446, 545, 708, 828, 878, 922}, /* AGG */
136 {0, 0, 0, 0, 197, 0, 355, 481, 584, 752, 872, 922, 966}, /* AGG+SGI */
137 };
138
139 static s32 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = {
140 {0, 0, 0, 0, 99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */
141 {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */
142 {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */
143 {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */
144 };
145
146 static s32 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = {
147 {0, 0, 0, 0, 152, 0, 211, 239, 255, 279, 290, 294, 297}, /* Norm */
148 {0, 0, 0, 0, 160, 0, 219, 245, 261, 284, 294, 297, 300}, /* SGI */
149 {0, 0, 0, 0, 254, 0, 443, 584, 695, 868, 984, 1030, 1070}, /* AGG */
150 {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */
151 };
152
153 /* mbps, mcs */
154 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
155 { "1", "BPSK DSSS"},
156 { "2", "QPSK DSSS"},
157 {"5.5", "BPSK CCK"},
158 { "11", "QPSK CCK"},
159 { "6", "BPSK 1/2"},
160 { "9", "BPSK 1/2"},
161 { "12", "QPSK 1/2"},
162 { "18", "QPSK 3/4"},
163 { "24", "16QAM 1/2"},
164 { "36", "16QAM 3/4"},
165 { "48", "64QAM 2/3"},
166 { "54", "64QAM 3/4"},
167 { "60", "64QAM 5/6"},
168 };
169
170 #define MCS_INDEX_PER_STREAM (8)
171
172 static inline u8 rs_extract_rate(u32 rate_n_flags)
173 {
174 return (u8)(rate_n_flags & 0xFF);
175 }
176
177 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
178 {
179 window->data = 0;
180 window->success_counter = 0;
181 window->success_ratio = IWL_INVALID_VALUE;
182 window->counter = 0;
183 window->average_tpt = IWL_INVALID_VALUE;
184 window->stamp = 0;
185 }
186
187 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
188 {
189 return (ant_type & valid_antenna) == ant_type;
190 }
191
192 /*
193 * removes the old data from the statistics. All data that is older than
194 * TID_MAX_TIME_DIFF, will be deleted.
195 */
196 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
197 {
198 /* The oldest age we want to keep */
199 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
200
201 while (tl->queue_count &&
202 (tl->time_stamp < oldest_time)) {
203 tl->total -= tl->packet_count[tl->head];
204 tl->packet_count[tl->head] = 0;
205 tl->time_stamp += TID_QUEUE_CELL_SPACING;
206 tl->queue_count--;
207 tl->head++;
208 if (tl->head >= TID_QUEUE_MAX_SIZE)
209 tl->head = 0;
210 }
211 }
212
213 /*
214 * increment traffic load value for tid and also remove
215 * any old values if passed the certain time period
216 */
217 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
218 struct ieee80211_hdr *hdr)
219 {
220 u32 curr_time = jiffies_to_msecs(jiffies);
221 u32 time_diff;
222 s32 index;
223 struct iwl_traffic_load *tl = NULL;
224 u8 tid;
225
226 if (ieee80211_is_data_qos(hdr->frame_control)) {
227 u8 *qc = ieee80211_get_qos_ctl(hdr);
228 tid = qc[0] & 0xf;
229 } else
230 return MAX_TID_COUNT;
231
232 if (unlikely(tid >= TID_MAX_LOAD_COUNT))
233 return MAX_TID_COUNT;
234
235 tl = &lq_data->load[tid];
236
237 curr_time -= curr_time % TID_ROUND_VALUE;
238
239 /* Happens only for the first packet. Initialize the data */
240 if (!(tl->queue_count)) {
241 tl->total = 1;
242 tl->time_stamp = curr_time;
243 tl->queue_count = 1;
244 tl->head = 0;
245 tl->packet_count[0] = 1;
246 return MAX_TID_COUNT;
247 }
248
249 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
250 index = time_diff / TID_QUEUE_CELL_SPACING;
251
252 /* The history is too long: remove data that is older than */
253 /* TID_MAX_TIME_DIFF */
254 if (index >= TID_QUEUE_MAX_SIZE)
255 rs_tl_rm_old_stats(tl, curr_time);
256
257 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
258 tl->packet_count[index] = tl->packet_count[index] + 1;
259 tl->total = tl->total + 1;
260
261 if ((index + 1) > tl->queue_count)
262 tl->queue_count = index + 1;
263
264 return tid;
265 }
266
267 /*
268 get the traffic load value for tid
269 */
270 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
271 {
272 u32 curr_time = jiffies_to_msecs(jiffies);
273 u32 time_diff;
274 s32 index;
275 struct iwl_traffic_load *tl = NULL;
276
277 if (tid >= TID_MAX_LOAD_COUNT)
278 return 0;
279
280 tl = &(lq_data->load[tid]);
281
282 curr_time -= curr_time % TID_ROUND_VALUE;
283
284 if (!(tl->queue_count))
285 return 0;
286
287 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
288 index = time_diff / TID_QUEUE_CELL_SPACING;
289
290 /* The history is too long: remove data that is older than */
291 /* TID_MAX_TIME_DIFF */
292 if (index >= TID_QUEUE_MAX_SIZE)
293 rs_tl_rm_old_stats(tl, curr_time);
294
295 return tl->total;
296 }
297
298 static int rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
299 struct iwl_lq_sta *lq_data, u8 tid,
300 struct ieee80211_sta *sta)
301 {
302 int ret = -EAGAIN;
303
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 ieee80211_stop_tx_ba_session(sta, tid,
317 WLAN_BACK_INITIATOR);
318 }
319 } else
320 IWL_ERR(priv, "Fail finding valid aggregation tid: %d\n", tid);
321 return ret;
322 }
323
324 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
325 struct iwl_lq_sta *lq_data,
326 struct ieee80211_sta *sta)
327 {
328 if ((tid < TID_MAX_LOAD_COUNT) &&
329 !rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta)) {
330 if (priv->cfg->use_rts_for_ht) {
331 /*
332 * switch to RTS/CTS if it is the prefer protection
333 * method for HT traffic
334 */
335 IWL_DEBUG_HT(priv, "use RTS/CTS protection for HT\n");
336 priv->staging_rxon.flags &= ~RXON_FLG_SELF_CTS_EN;
337 iwlcore_commit_rxon(priv);
338 }
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 (is_legacy(rate_type)) {
615 return lq_sta->active_legacy_rate;
616 } else {
617 if (is_siso(rate_type))
618 return lq_sta->active_siso_rate;
619 else if (is_mimo2(rate_type))
620 return lq_sta->active_mimo2_rate;
621 else
622 return lq_sta->active_mimo3_rate;
623 }
624 }
625
626 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
627 int rate_type)
628 {
629 u8 high = IWL_RATE_INVALID;
630 u8 low = IWL_RATE_INVALID;
631
632 /* 802.11A or ht walks to the next literal adjacent rate in
633 * the rate table */
634 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
635 int i;
636 u32 mask;
637
638 /* Find the previous rate that is in the rate mask */
639 i = index - 1;
640 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
641 if (rate_mask & mask) {
642 low = i;
643 break;
644 }
645 }
646
647 /* Find the next rate that is in the rate mask */
648 i = index + 1;
649 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
650 if (rate_mask & mask) {
651 high = i;
652 break;
653 }
654 }
655
656 return (high << 8) | low;
657 }
658
659 low = index;
660 while (low != IWL_RATE_INVALID) {
661 low = iwl_rates[low].prev_rs;
662 if (low == IWL_RATE_INVALID)
663 break;
664 if (rate_mask & (1 << low))
665 break;
666 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
667 }
668
669 high = index;
670 while (high != IWL_RATE_INVALID) {
671 high = iwl_rates[high].next_rs;
672 if (high == IWL_RATE_INVALID)
673 break;
674 if (rate_mask & (1 << high))
675 break;
676 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
677 }
678
679 return (high << 8) | low;
680 }
681
682 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
683 struct iwl_scale_tbl_info *tbl,
684 u8 scale_index, u8 ht_possible)
685 {
686 s32 low;
687 u16 rate_mask;
688 u16 high_low;
689 u8 switch_to_legacy = 0;
690 u8 is_green = lq_sta->is_green;
691 struct iwl_priv *priv = lq_sta->drv;
692
693 /* check if we need to switch from HT to legacy rates.
694 * assumption is that mandatory rates (1Mbps or 6Mbps)
695 * are always supported (spec demand) */
696 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
697 switch_to_legacy = 1;
698 scale_index = rs_ht_to_legacy[scale_index];
699 if (lq_sta->band == IEEE80211_BAND_5GHZ)
700 tbl->lq_type = LQ_A;
701 else
702 tbl->lq_type = LQ_G;
703
704 if (num_of_ant(tbl->ant_type) > 1)
705 tbl->ant_type =
706 first_antenna(priv->hw_params.valid_tx_ant);
707
708 tbl->is_ht40 = 0;
709 tbl->is_SGI = 0;
710 tbl->max_search = IWL_MAX_SEARCH;
711 }
712
713 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
714
715 /* Mask with station rate restriction */
716 if (is_legacy(tbl->lq_type)) {
717 /* supp_rates has no CCK bits in A mode */
718 if (lq_sta->band == IEEE80211_BAND_5GHZ)
719 rate_mask = (u16)(rate_mask &
720 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
721 else
722 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
723 }
724
725 /* If we switched from HT to legacy, check current rate */
726 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
727 low = scale_index;
728 goto out;
729 }
730
731 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
732 tbl->lq_type);
733 low = high_low & 0xff;
734
735 if (low == IWL_RATE_INVALID)
736 low = scale_index;
737
738 out:
739 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
740 }
741
742 /*
743 * Simple function to compare two rate scale table types
744 */
745 static bool table_type_matches(struct iwl_scale_tbl_info *a,
746 struct iwl_scale_tbl_info *b)
747 {
748 return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
749 (a->is_SGI == b->is_SGI);
750 }
751
752 /*
753 * mac80211 sends us Tx status
754 */
755 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
756 struct ieee80211_sta *sta, void *priv_sta,
757 struct sk_buff *skb)
758 {
759 int legacy_success;
760 int retries;
761 int rs_index, mac_index, i;
762 struct iwl_lq_sta *lq_sta = priv_sta;
763 struct iwl_link_quality_cmd *table;
764 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
765 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
766 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
767 enum mac80211_rate_control_flags mac_flags;
768 u32 tx_rate;
769 struct iwl_scale_tbl_info tbl_type;
770 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
771
772 IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
773
774 /* Treat uninitialized rate scaling data same as non-existing. */
775 if (!lq_sta) {
776 IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n");
777 return;
778 } else if (!lq_sta->drv) {
779 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
780 return;
781 }
782
783 if (!ieee80211_is_data(hdr->frame_control) ||
784 info->flags & IEEE80211_TX_CTL_NO_ACK)
785 return;
786
787 /* This packet was aggregated but doesn't carry status info */
788 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
789 !(info->flags & IEEE80211_TX_STAT_AMPDU))
790 return;
791
792 /*
793 * Ignore this Tx frame response if its initial rate doesn't match
794 * that of latest Link Quality command. There may be stragglers
795 * from a previous Link Quality command, but we're no longer interested
796 * in those; they're either from the "active" mode while we're trying
797 * to check "search" mode, or a prior "search" mode after we've moved
798 * to a new "search" mode (which might become the new "active" mode).
799 */
800 table = &lq_sta->lq;
801 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
802 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
803 if (priv->band == IEEE80211_BAND_5GHZ)
804 rs_index -= IWL_FIRST_OFDM_RATE;
805 mac_flags = info->status.rates[0].flags;
806 mac_index = info->status.rates[0].idx;
807 /* For HT packets, map MCS to PLCP */
808 if (mac_flags & IEEE80211_TX_RC_MCS) {
809 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
810 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
811 mac_index++;
812 /*
813 * mac80211 HT index is always zero-indexed; we need to move
814 * HT OFDM rates after CCK rates in 2.4 GHz band
815 */
816 if (priv->band == IEEE80211_BAND_2GHZ)
817 mac_index += IWL_FIRST_OFDM_RATE;
818 }
819 /* Here we actually compare this rate to the latest LQ command */
820 if ((mac_index < 0) ||
821 (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
822 (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
823 (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
824 (tbl_type.ant_type != info->antenna_sel_tx) ||
825 (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
826 (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
827 (rs_index != mac_index)) {
828 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate);
829 /*
830 * Since rates mis-match, the last LQ command may have failed.
831 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
832 * ... driver.
833 */
834 lq_sta->missed_rate_counter++;
835 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
836 lq_sta->missed_rate_counter = 0;
837 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC, false);
838 }
839 /* Regardless, ignore this status info for outdated rate */
840 return;
841 } else
842 /* Rate did match, so reset the missed_rate_counter */
843 lq_sta->missed_rate_counter = 0;
844
845 /* Figure out if rate scale algorithm is in active or search table */
846 if (table_type_matches(&tbl_type,
847 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
848 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
849 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
850 } else if (table_type_matches(&tbl_type,
851 &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
852 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
853 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
854 } else {
855 IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n");
856 return;
857 }
858
859 /*
860 * Updating the frame history depends on whether packets were
861 * aggregated.
862 *
863 * For aggregation, all packets were transmitted at the same rate, the
864 * first index into rate scale table.
865 */
866 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
867 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
868 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
869 &rs_index);
870 rs_collect_tx_data(curr_tbl, rs_index,
871 info->status.ampdu_ack_len,
872 info->status.ampdu_ack_map);
873
874 /* Update success/fail counts if not searching for new mode */
875 if (lq_sta->stay_in_tbl) {
876 lq_sta->total_success += info->status.ampdu_ack_map;
877 lq_sta->total_failed += (info->status.ampdu_ack_len -
878 info->status.ampdu_ack_map);
879 }
880 } else {
881 /*
882 * For legacy, update frame history with for each Tx retry.
883 */
884 retries = info->status.rates[0].count - 1;
885 /* HW doesn't send more than 15 retries */
886 retries = min(retries, 15);
887
888 /* The last transmission may have been successful */
889 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
890 /* Collect data for each rate used during failed TX attempts */
891 for (i = 0; i <= retries; ++i) {
892 tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
893 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
894 &tbl_type, &rs_index);
895 /*
896 * Only collect stats if retried rate is in the same RS
897 * table as active/search.
898 */
899 if (table_type_matches(&tbl_type, curr_tbl))
900 tmp_tbl = curr_tbl;
901 else if (table_type_matches(&tbl_type, other_tbl))
902 tmp_tbl = other_tbl;
903 else
904 continue;
905 rs_collect_tx_data(tmp_tbl, rs_index, 1,
906 i < retries ? 0 : legacy_success);
907 }
908
909 /* Update success/fail counts if not searching for new mode */
910 if (lq_sta->stay_in_tbl) {
911 lq_sta->total_success += legacy_success;
912 lq_sta->total_failed += retries + (1 - legacy_success);
913 }
914 }
915 /* The last TX rate is cached in lq_sta; it's set in if/else above */
916 lq_sta->last_rate_n_flags = tx_rate;
917
918 /* See if there's a better rate or modulation mode to try. */
919 if (sta && sta->supp_rates[sband->band])
920 rs_rate_scale_perform(priv, skb, sta, lq_sta);
921 }
922
923 /*
924 * Begin a period of staying with a selected modulation mode.
925 * Set "stay_in_tbl" flag to prevent any mode switches.
926 * Set frame tx success limits according to legacy vs. high-throughput,
927 * and reset overall (spanning all rates) tx success history statistics.
928 * These control how long we stay using same modulation mode before
929 * searching for a new mode.
930 */
931 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
932 struct iwl_lq_sta *lq_sta)
933 {
934 IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
935 lq_sta->stay_in_tbl = 1; /* only place this gets set */
936 if (is_legacy) {
937 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
938 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
939 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
940 } else {
941 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
942 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
943 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
944 }
945 lq_sta->table_count = 0;
946 lq_sta->total_failed = 0;
947 lq_sta->total_success = 0;
948 lq_sta->flush_timer = jiffies;
949 lq_sta->action_counter = 0;
950 }
951
952 /*
953 * Find correct throughput table for given mode of modulation
954 */
955 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
956 struct iwl_scale_tbl_info *tbl)
957 {
958 /* Used to choose among HT tables */
959 s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
960
961 /* Check for invalid LQ type */
962 if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
963 tbl->expected_tpt = expected_tpt_legacy;
964 return;
965 }
966
967 /* Legacy rates have only one table */
968 if (is_legacy(tbl->lq_type)) {
969 tbl->expected_tpt = expected_tpt_legacy;
970 return;
971 }
972
973 /* Choose among many HT tables depending on number of streams
974 * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
975 * status */
976 if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
977 ht_tbl_pointer = expected_tpt_siso20MHz;
978 else if (is_siso(tbl->lq_type))
979 ht_tbl_pointer = expected_tpt_siso40MHz;
980 else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
981 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
982 else if (is_mimo2(tbl->lq_type))
983 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
984 else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
985 ht_tbl_pointer = expected_tpt_mimo3_20MHz;
986 else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
987 ht_tbl_pointer = expected_tpt_mimo3_40MHz;
988
989 if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */
990 tbl->expected_tpt = ht_tbl_pointer[0];
991 else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */
992 tbl->expected_tpt = ht_tbl_pointer[1];
993 else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */
994 tbl->expected_tpt = ht_tbl_pointer[2];
995 else /* AGG+SGI */
996 tbl->expected_tpt = ht_tbl_pointer[3];
997 }
998
999 /*
1000 * Find starting rate for new "search" high-throughput mode of modulation.
1001 * Goal is to find lowest expected rate (under perfect conditions) that is
1002 * above the current measured throughput of "active" mode, to give new mode
1003 * a fair chance to prove itself without too many challenges.
1004 *
1005 * This gets called when transitioning to more aggressive modulation
1006 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1007 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1008 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1009 * bit rate will typically need to increase, but not if performance was bad.
1010 */
1011 static s32 rs_get_best_rate(struct iwl_priv *priv,
1012 struct iwl_lq_sta *lq_sta,
1013 struct iwl_scale_tbl_info *tbl, /* "search" */
1014 u16 rate_mask, s8 index)
1015 {
1016 /* "active" values */
1017 struct iwl_scale_tbl_info *active_tbl =
1018 &(lq_sta->lq_info[lq_sta->active_tbl]);
1019 s32 active_sr = active_tbl->win[index].success_ratio;
1020 s32 active_tpt = active_tbl->expected_tpt[index];
1021
1022 /* expected "search" throughput */
1023 s32 *tpt_tbl = tbl->expected_tpt;
1024
1025 s32 new_rate, high, low, start_hi;
1026 u16 high_low;
1027 s8 rate = index;
1028
1029 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1030
1031 for (; ;) {
1032 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1033 tbl->lq_type);
1034
1035 low = high_low & 0xff;
1036 high = (high_low >> 8) & 0xff;
1037
1038 /*
1039 * Lower the "search" bit rate, to give new "search" mode
1040 * approximately the same throughput as "active" if:
1041 *
1042 * 1) "Active" mode has been working modestly well (but not
1043 * great), and expected "search" throughput (under perfect
1044 * conditions) at candidate rate is above the actual
1045 * measured "active" throughput (but less than expected
1046 * "active" throughput under perfect conditions).
1047 * OR
1048 * 2) "Active" mode has been working perfectly or very well
1049 * and expected "search" throughput (under perfect
1050 * conditions) at candidate rate is above expected
1051 * "active" throughput (under perfect conditions).
1052 */
1053 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1054 ((active_sr > IWL_RATE_DECREASE_TH) &&
1055 (active_sr <= IWL_RATE_HIGH_TH) &&
1056 (tpt_tbl[rate] <= active_tpt))) ||
1057 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1058 (tpt_tbl[rate] > active_tpt))) {
1059
1060 /* (2nd or later pass)
1061 * If we've already tried to raise the rate, and are
1062 * now trying to lower it, use the higher rate. */
1063 if (start_hi != IWL_RATE_INVALID) {
1064 new_rate = start_hi;
1065 break;
1066 }
1067
1068 new_rate = rate;
1069
1070 /* Loop again with lower rate */
1071 if (low != IWL_RATE_INVALID)
1072 rate = low;
1073
1074 /* Lower rate not available, use the original */
1075 else
1076 break;
1077
1078 /* Else try to raise the "search" rate to match "active" */
1079 } else {
1080 /* (2nd or later pass)
1081 * If we've already tried to lower the rate, and are
1082 * now trying to raise it, use the lower rate. */
1083 if (new_rate != IWL_RATE_INVALID)
1084 break;
1085
1086 /* Loop again with higher rate */
1087 else if (high != IWL_RATE_INVALID) {
1088 start_hi = high;
1089 rate = high;
1090
1091 /* Higher rate not available, use the original */
1092 } else {
1093 new_rate = rate;
1094 break;
1095 }
1096 }
1097 }
1098
1099 return new_rate;
1100 }
1101
1102 /*
1103 * Set up search table for MIMO2
1104 */
1105 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1106 struct iwl_lq_sta *lq_sta,
1107 struct ieee80211_conf *conf,
1108 struct ieee80211_sta *sta,
1109 struct iwl_scale_tbl_info *tbl, int index)
1110 {
1111 u16 rate_mask;
1112 s32 rate;
1113 s8 is_green = lq_sta->is_green;
1114
1115 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1116 return -1;
1117
1118 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1119 == WLAN_HT_CAP_SM_PS_STATIC)
1120 return -1;
1121
1122 /* Need both Tx chains/antennas to support MIMO */
1123 if (priv->hw_params.tx_chains_num < 2)
1124 return -1;
1125
1126 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1127
1128 tbl->lq_type = LQ_MIMO2;
1129 tbl->is_dup = lq_sta->is_dup;
1130 tbl->action = 0;
1131 tbl->max_search = IWL_MAX_SEARCH;
1132 rate_mask = lq_sta->active_mimo2_rate;
1133
1134 if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1135 tbl->is_ht40 = 1;
1136 else
1137 tbl->is_ht40 = 0;
1138
1139 rs_set_expected_tpt_table(lq_sta, tbl);
1140
1141 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1142
1143 IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1144 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1145 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1146 rate, rate_mask);
1147 return -1;
1148 }
1149 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1150
1151 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1152 tbl->current_rate, is_green);
1153 return 0;
1154 }
1155
1156 /*
1157 * Set up search table for MIMO3
1158 */
1159 static int rs_switch_to_mimo3(struct iwl_priv *priv,
1160 struct iwl_lq_sta *lq_sta,
1161 struct ieee80211_conf *conf,
1162 struct ieee80211_sta *sta,
1163 struct iwl_scale_tbl_info *tbl, int index)
1164 {
1165 u16 rate_mask;
1166 s32 rate;
1167 s8 is_green = lq_sta->is_green;
1168
1169 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1170 return -1;
1171
1172 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1173 == WLAN_HT_CAP_SM_PS_STATIC)
1174 return -1;
1175
1176 /* Need both Tx chains/antennas to support MIMO */
1177 if (priv->hw_params.tx_chains_num < 3)
1178 return -1;
1179
1180 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1181
1182 tbl->lq_type = LQ_MIMO3;
1183 tbl->is_dup = lq_sta->is_dup;
1184 tbl->action = 0;
1185 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1186 rate_mask = lq_sta->active_mimo3_rate;
1187
1188 if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1189 tbl->is_ht40 = 1;
1190 else
1191 tbl->is_ht40 = 0;
1192
1193 rs_set_expected_tpt_table(lq_sta, tbl);
1194
1195 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1196
1197 IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1198 rate, rate_mask);
1199 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1200 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1201 rate, rate_mask);
1202 return -1;
1203 }
1204 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1205
1206 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1207 tbl->current_rate, is_green);
1208 return 0;
1209 }
1210
1211 /*
1212 * Set up search table for SISO
1213 */
1214 static int rs_switch_to_siso(struct iwl_priv *priv,
1215 struct iwl_lq_sta *lq_sta,
1216 struct ieee80211_conf *conf,
1217 struct ieee80211_sta *sta,
1218 struct iwl_scale_tbl_info *tbl, int index)
1219 {
1220 u16 rate_mask;
1221 u8 is_green = lq_sta->is_green;
1222 s32 rate;
1223
1224 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1225 return -1;
1226
1227 IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1228
1229 tbl->is_dup = lq_sta->is_dup;
1230 tbl->lq_type = LQ_SISO;
1231 tbl->action = 0;
1232 tbl->max_search = IWL_MAX_SEARCH;
1233 rate_mask = lq_sta->active_siso_rate;
1234
1235 if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1236 tbl->is_ht40 = 1;
1237 else
1238 tbl->is_ht40 = 0;
1239
1240 if (is_green)
1241 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1242
1243 rs_set_expected_tpt_table(lq_sta, tbl);
1244 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1245
1246 IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1247 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1248 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1249 rate, rate_mask);
1250 return -1;
1251 }
1252 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1253 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1254 tbl->current_rate, is_green);
1255 return 0;
1256 }
1257
1258 /*
1259 * Try to switch to new modulation mode from legacy
1260 */
1261 static int rs_move_legacy_other(struct iwl_priv *priv,
1262 struct iwl_lq_sta *lq_sta,
1263 struct ieee80211_conf *conf,
1264 struct ieee80211_sta *sta,
1265 int index)
1266 {
1267 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1268 struct iwl_scale_tbl_info *search_tbl =
1269 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1270 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1271 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1272 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1273 u8 start_action = tbl->action;
1274 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1275 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1276 int ret = 0;
1277 u8 update_search_tbl_counter = 0;
1278
1279 if (!iwl_ht_enabled(priv))
1280 /* stay in Legacy */
1281 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1282 else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1283 tbl->action > IWL_LEGACY_SWITCH_SISO)
1284 tbl->action = IWL_LEGACY_SWITCH_SISO;
1285 for (; ;) {
1286 lq_sta->action_counter++;
1287 switch (tbl->action) {
1288 case IWL_LEGACY_SWITCH_ANTENNA1:
1289 case IWL_LEGACY_SWITCH_ANTENNA2:
1290 IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1291
1292 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1293 tx_chains_num <= 1) ||
1294 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1295 tx_chains_num <= 2))
1296 break;
1297
1298 /* Don't change antenna if success has been great */
1299 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1300 break;
1301
1302 /* Set up search table to try other antenna */
1303 memcpy(search_tbl, tbl, sz);
1304
1305 if (rs_toggle_antenna(valid_tx_ant,
1306 &search_tbl->current_rate, search_tbl)) {
1307 update_search_tbl_counter = 1;
1308 rs_set_expected_tpt_table(lq_sta, search_tbl);
1309 goto out;
1310 }
1311 break;
1312 case IWL_LEGACY_SWITCH_SISO:
1313 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1314
1315 /* Set up search table to try SISO */
1316 memcpy(search_tbl, tbl, sz);
1317 search_tbl->is_SGI = 0;
1318 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1319 search_tbl, index);
1320 if (!ret) {
1321 lq_sta->action_counter = 0;
1322 goto out;
1323 }
1324
1325 break;
1326 case IWL_LEGACY_SWITCH_MIMO2_AB:
1327 case IWL_LEGACY_SWITCH_MIMO2_AC:
1328 case IWL_LEGACY_SWITCH_MIMO2_BC:
1329 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1330
1331 /* Set up search table to try MIMO */
1332 memcpy(search_tbl, tbl, sz);
1333 search_tbl->is_SGI = 0;
1334
1335 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1336 search_tbl->ant_type = ANT_AB;
1337 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1338 search_tbl->ant_type = ANT_AC;
1339 else
1340 search_tbl->ant_type = ANT_BC;
1341
1342 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1343 break;
1344
1345 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1346 search_tbl, index);
1347 if (!ret) {
1348 lq_sta->action_counter = 0;
1349 goto out;
1350 }
1351 break;
1352
1353 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1354 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1355
1356 /* Set up search table to try MIMO3 */
1357 memcpy(search_tbl, tbl, sz);
1358 search_tbl->is_SGI = 0;
1359
1360 search_tbl->ant_type = ANT_ABC;
1361
1362 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1363 break;
1364
1365 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1366 search_tbl, index);
1367 if (!ret) {
1368 lq_sta->action_counter = 0;
1369 goto out;
1370 }
1371 break;
1372 }
1373 tbl->action++;
1374 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1375 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1376
1377 if (tbl->action == start_action)
1378 break;
1379
1380 }
1381 search_tbl->lq_type = LQ_NONE;
1382 return 0;
1383
1384 out:
1385 lq_sta->search_better_tbl = 1;
1386 tbl->action++;
1387 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1388 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1389 if (update_search_tbl_counter)
1390 search_tbl->action = tbl->action;
1391 return 0;
1392
1393 }
1394
1395 /*
1396 * Try to switch to new modulation mode from SISO
1397 */
1398 static int rs_move_siso_to_other(struct iwl_priv *priv,
1399 struct iwl_lq_sta *lq_sta,
1400 struct ieee80211_conf *conf,
1401 struct ieee80211_sta *sta, int index)
1402 {
1403 u8 is_green = lq_sta->is_green;
1404 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1405 struct iwl_scale_tbl_info *search_tbl =
1406 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1407 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1408 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1409 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1410 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1411 u8 start_action = tbl->action;
1412 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1413 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1414 u8 update_search_tbl_counter = 0;
1415 int ret;
1416
1417 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1418 tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1419 /* stay in SISO */
1420 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1421 }
1422 for (;;) {
1423 lq_sta->action_counter++;
1424 switch (tbl->action) {
1425 case IWL_SISO_SWITCH_ANTENNA1:
1426 case IWL_SISO_SWITCH_ANTENNA2:
1427 IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1428
1429 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1430 tx_chains_num <= 1) ||
1431 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1432 tx_chains_num <= 2))
1433 break;
1434
1435 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1436 break;
1437
1438 memcpy(search_tbl, tbl, sz);
1439 if (rs_toggle_antenna(valid_tx_ant,
1440 &search_tbl->current_rate, search_tbl)) {
1441 update_search_tbl_counter = 1;
1442 goto out;
1443 }
1444 break;
1445 case IWL_SISO_SWITCH_MIMO2_AB:
1446 case IWL_SISO_SWITCH_MIMO2_AC:
1447 case IWL_SISO_SWITCH_MIMO2_BC:
1448 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1449 memcpy(search_tbl, tbl, sz);
1450 search_tbl->is_SGI = 0;
1451
1452 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1453 search_tbl->ant_type = ANT_AB;
1454 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1455 search_tbl->ant_type = ANT_AC;
1456 else
1457 search_tbl->ant_type = ANT_BC;
1458
1459 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1460 break;
1461
1462 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1463 search_tbl, index);
1464 if (!ret)
1465 goto out;
1466 break;
1467 case IWL_SISO_SWITCH_GI:
1468 if (!tbl->is_ht40 && !(ht_cap->cap &
1469 IEEE80211_HT_CAP_SGI_20))
1470 break;
1471 if (tbl->is_ht40 && !(ht_cap->cap &
1472 IEEE80211_HT_CAP_SGI_40))
1473 break;
1474
1475 IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1476
1477 memcpy(search_tbl, tbl, sz);
1478 if (is_green) {
1479 if (!tbl->is_SGI)
1480 break;
1481 else
1482 IWL_ERR(priv,
1483 "SGI was set in GF+SISO\n");
1484 }
1485 search_tbl->is_SGI = !tbl->is_SGI;
1486 rs_set_expected_tpt_table(lq_sta, search_tbl);
1487 if (tbl->is_SGI) {
1488 s32 tpt = lq_sta->last_tpt / 100;
1489 if (tpt >= search_tbl->expected_tpt[index])
1490 break;
1491 }
1492 search_tbl->current_rate =
1493 rate_n_flags_from_tbl(priv, search_tbl,
1494 index, is_green);
1495 update_search_tbl_counter = 1;
1496 goto out;
1497 case IWL_SISO_SWITCH_MIMO3_ABC:
1498 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1499 memcpy(search_tbl, tbl, sz);
1500 search_tbl->is_SGI = 0;
1501 search_tbl->ant_type = ANT_ABC;
1502
1503 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1504 break;
1505
1506 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1507 search_tbl, index);
1508 if (!ret)
1509 goto out;
1510 break;
1511 }
1512 tbl->action++;
1513 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1514 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1515
1516 if (tbl->action == start_action)
1517 break;
1518 }
1519 search_tbl->lq_type = LQ_NONE;
1520 return 0;
1521
1522 out:
1523 lq_sta->search_better_tbl = 1;
1524 tbl->action++;
1525 if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1526 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1527 if (update_search_tbl_counter)
1528 search_tbl->action = tbl->action;
1529
1530 return 0;
1531 }
1532
1533 /*
1534 * Try to switch to new modulation mode from MIMO2
1535 */
1536 static int rs_move_mimo2_to_other(struct iwl_priv *priv,
1537 struct iwl_lq_sta *lq_sta,
1538 struct ieee80211_conf *conf,
1539 struct ieee80211_sta *sta, int index)
1540 {
1541 s8 is_green = lq_sta->is_green;
1542 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1543 struct iwl_scale_tbl_info *search_tbl =
1544 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1545 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1546 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1547 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1548 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1549 u8 start_action = tbl->action;
1550 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1551 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1552 u8 update_search_tbl_counter = 0;
1553 int ret;
1554
1555 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1556 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1557 tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1558 /* switch in SISO */
1559 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1560 }
1561 for (;;) {
1562 lq_sta->action_counter++;
1563 switch (tbl->action) {
1564 case IWL_MIMO2_SWITCH_ANTENNA1:
1565 case IWL_MIMO2_SWITCH_ANTENNA2:
1566 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1567
1568 if (tx_chains_num <= 2)
1569 break;
1570
1571 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1572 break;
1573
1574 memcpy(search_tbl, tbl, sz);
1575 if (rs_toggle_antenna(valid_tx_ant,
1576 &search_tbl->current_rate, search_tbl)) {
1577 update_search_tbl_counter = 1;
1578 goto out;
1579 }
1580 break;
1581 case IWL_MIMO2_SWITCH_SISO_A:
1582 case IWL_MIMO2_SWITCH_SISO_B:
1583 case IWL_MIMO2_SWITCH_SISO_C:
1584 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1585
1586 /* Set up new search table for SISO */
1587 memcpy(search_tbl, tbl, sz);
1588
1589 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1590 search_tbl->ant_type = ANT_A;
1591 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1592 search_tbl->ant_type = ANT_B;
1593 else
1594 search_tbl->ant_type = ANT_C;
1595
1596 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1597 break;
1598
1599 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1600 search_tbl, index);
1601 if (!ret)
1602 goto out;
1603
1604 break;
1605
1606 case IWL_MIMO2_SWITCH_GI:
1607 if (!tbl->is_ht40 && !(ht_cap->cap &
1608 IEEE80211_HT_CAP_SGI_20))
1609 break;
1610 if (tbl->is_ht40 && !(ht_cap->cap &
1611 IEEE80211_HT_CAP_SGI_40))
1612 break;
1613
1614 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1615
1616 /* Set up new search table for MIMO2 */
1617 memcpy(search_tbl, tbl, sz);
1618 search_tbl->is_SGI = !tbl->is_SGI;
1619 rs_set_expected_tpt_table(lq_sta, search_tbl);
1620 /*
1621 * If active table already uses the fastest possible
1622 * modulation (dual stream with short guard interval),
1623 * and it's working well, there's no need to look
1624 * for a better type of modulation!
1625 */
1626 if (tbl->is_SGI) {
1627 s32 tpt = lq_sta->last_tpt / 100;
1628 if (tpt >= search_tbl->expected_tpt[index])
1629 break;
1630 }
1631 search_tbl->current_rate =
1632 rate_n_flags_from_tbl(priv, search_tbl,
1633 index, is_green);
1634 update_search_tbl_counter = 1;
1635 goto out;
1636
1637 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1638 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1639 memcpy(search_tbl, tbl, sz);
1640 search_tbl->is_SGI = 0;
1641 search_tbl->ant_type = ANT_ABC;
1642
1643 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1644 break;
1645
1646 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1647 search_tbl, index);
1648 if (!ret)
1649 goto out;
1650
1651 break;
1652 }
1653 tbl->action++;
1654 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1655 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1656
1657 if (tbl->action == start_action)
1658 break;
1659 }
1660 search_tbl->lq_type = LQ_NONE;
1661 return 0;
1662 out:
1663 lq_sta->search_better_tbl = 1;
1664 tbl->action++;
1665 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1666 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1667 if (update_search_tbl_counter)
1668 search_tbl->action = tbl->action;
1669
1670 return 0;
1671
1672 }
1673
1674 /*
1675 * Try to switch to new modulation mode from MIMO3
1676 */
1677 static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1678 struct iwl_lq_sta *lq_sta,
1679 struct ieee80211_conf *conf,
1680 struct ieee80211_sta *sta, int index)
1681 {
1682 s8 is_green = lq_sta->is_green;
1683 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1684 struct iwl_scale_tbl_info *search_tbl =
1685 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1686 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1687 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1688 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1689 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1690 u8 start_action = tbl->action;
1691 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1692 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1693 int ret;
1694 u8 update_search_tbl_counter = 0;
1695
1696 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1697 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1698 tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1699 /* switch in SISO */
1700 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1701 }
1702 for (;;) {
1703 lq_sta->action_counter++;
1704 switch (tbl->action) {
1705 case IWL_MIMO3_SWITCH_ANTENNA1:
1706 case IWL_MIMO3_SWITCH_ANTENNA2:
1707 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
1708
1709 if (tx_chains_num <= 3)
1710 break;
1711
1712 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1713 break;
1714
1715 memcpy(search_tbl, tbl, sz);
1716 if (rs_toggle_antenna(valid_tx_ant,
1717 &search_tbl->current_rate, search_tbl))
1718 goto out;
1719 break;
1720 case IWL_MIMO3_SWITCH_SISO_A:
1721 case IWL_MIMO3_SWITCH_SISO_B:
1722 case IWL_MIMO3_SWITCH_SISO_C:
1723 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
1724
1725 /* Set up new search table for SISO */
1726 memcpy(search_tbl, tbl, sz);
1727
1728 if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
1729 search_tbl->ant_type = ANT_A;
1730 else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
1731 search_tbl->ant_type = ANT_B;
1732 else
1733 search_tbl->ant_type = ANT_C;
1734
1735 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1736 break;
1737
1738 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1739 search_tbl, index);
1740 if (!ret)
1741 goto out;
1742
1743 break;
1744
1745 case IWL_MIMO3_SWITCH_MIMO2_AB:
1746 case IWL_MIMO3_SWITCH_MIMO2_AC:
1747 case IWL_MIMO3_SWITCH_MIMO2_BC:
1748 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
1749
1750 memcpy(search_tbl, tbl, sz);
1751 search_tbl->is_SGI = 0;
1752 if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
1753 search_tbl->ant_type = ANT_AB;
1754 else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
1755 search_tbl->ant_type = ANT_AC;
1756 else
1757 search_tbl->ant_type = ANT_BC;
1758
1759 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1760 break;
1761
1762 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1763 search_tbl, index);
1764 if (!ret)
1765 goto out;
1766
1767 break;
1768
1769 case IWL_MIMO3_SWITCH_GI:
1770 if (!tbl->is_ht40 && !(ht_cap->cap &
1771 IEEE80211_HT_CAP_SGI_20))
1772 break;
1773 if (tbl->is_ht40 && !(ht_cap->cap &
1774 IEEE80211_HT_CAP_SGI_40))
1775 break;
1776
1777 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
1778
1779 /* Set up new search table for MIMO */
1780 memcpy(search_tbl, tbl, sz);
1781 search_tbl->is_SGI = !tbl->is_SGI;
1782 rs_set_expected_tpt_table(lq_sta, search_tbl);
1783 /*
1784 * If active table already uses the fastest possible
1785 * modulation (dual stream with short guard interval),
1786 * and it's working well, there's no need to look
1787 * for a better type of modulation!
1788 */
1789 if (tbl->is_SGI) {
1790 s32 tpt = lq_sta->last_tpt / 100;
1791 if (tpt >= search_tbl->expected_tpt[index])
1792 break;
1793 }
1794 search_tbl->current_rate =
1795 rate_n_flags_from_tbl(priv, search_tbl,
1796 index, is_green);
1797 update_search_tbl_counter = 1;
1798 goto out;
1799 }
1800 tbl->action++;
1801 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1802 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1803
1804 if (tbl->action == start_action)
1805 break;
1806 }
1807 search_tbl->lq_type = LQ_NONE;
1808 return 0;
1809 out:
1810 lq_sta->search_better_tbl = 1;
1811 tbl->action++;
1812 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1813 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1814 if (update_search_tbl_counter)
1815 search_tbl->action = tbl->action;
1816
1817 return 0;
1818
1819 }
1820
1821 /*
1822 * Check whether we should continue using same modulation mode, or
1823 * begin search for a new mode, based on:
1824 * 1) # tx successes or failures while using this mode
1825 * 2) # times calling this function
1826 * 3) elapsed time in this mode (not used, for now)
1827 */
1828 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta)
1829 {
1830 struct iwl_scale_tbl_info *tbl;
1831 int i;
1832 int active_tbl;
1833 int flush_interval_passed = 0;
1834 struct iwl_priv *priv;
1835
1836 priv = lq_sta->drv;
1837 active_tbl = lq_sta->active_tbl;
1838
1839 tbl = &(lq_sta->lq_info[active_tbl]);
1840
1841 /* If we've been disallowing search, see if we should now allow it */
1842 if (lq_sta->stay_in_tbl) {
1843
1844 /* Elapsed time using current modulation mode */
1845 if (lq_sta->flush_timer)
1846 flush_interval_passed =
1847 time_after(jiffies,
1848 (unsigned long)(lq_sta->flush_timer +
1849 IWL_RATE_SCALE_FLUSH_INTVL));
1850
1851 /*
1852 * Check if we should allow search for new modulation mode.
1853 * If many frames have failed or succeeded, or we've used
1854 * this same modulation for a long time, allow search, and
1855 * reset history stats that keep track of whether we should
1856 * allow a new search. Also (below) reset all bitmaps and
1857 * stats in active history.
1858 */
1859 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1860 (lq_sta->total_success > lq_sta->max_success_limit) ||
1861 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1862 && (flush_interval_passed))) {
1863 IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n:",
1864 lq_sta->total_failed,
1865 lq_sta->total_success,
1866 flush_interval_passed);
1867
1868 /* Allow search for new mode */
1869 lq_sta->stay_in_tbl = 0; /* only place reset */
1870 lq_sta->total_failed = 0;
1871 lq_sta->total_success = 0;
1872 lq_sta->flush_timer = 0;
1873
1874 /*
1875 * Else if we've used this modulation mode enough repetitions
1876 * (regardless of elapsed time or success/failure), reset
1877 * history bitmaps and rate-specific stats for all rates in
1878 * active table.
1879 */
1880 } else {
1881 lq_sta->table_count++;
1882 if (lq_sta->table_count >=
1883 lq_sta->table_count_limit) {
1884 lq_sta->table_count = 0;
1885
1886 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
1887 for (i = 0; i < IWL_RATE_COUNT; i++)
1888 rs_rate_scale_clear_window(
1889 &(tbl->win[i]));
1890 }
1891 }
1892
1893 /* If transitioning to allow "search", reset all history
1894 * bitmaps and stats in active table (this will become the new
1895 * "search" table). */
1896 if (!lq_sta->stay_in_tbl) {
1897 for (i = 0; i < IWL_RATE_COUNT; i++)
1898 rs_rate_scale_clear_window(&(tbl->win[i]));
1899 }
1900 }
1901 }
1902
1903 /*
1904 * setup rate table in uCode
1905 * return rate_n_flags as used in the table
1906 */
1907 static u32 rs_update_rate_tbl(struct iwl_priv *priv,
1908 struct iwl_lq_sta *lq_sta,
1909 struct iwl_scale_tbl_info *tbl,
1910 int index, u8 is_green)
1911 {
1912 u32 rate;
1913
1914 /* Update uCode's rate table. */
1915 rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
1916 rs_fill_link_cmd(priv, lq_sta, rate);
1917 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC, false);
1918
1919 return rate;
1920 }
1921
1922 /*
1923 * Do rate scaling and search for new modulation mode.
1924 */
1925 static void rs_rate_scale_perform(struct iwl_priv *priv,
1926 struct sk_buff *skb,
1927 struct ieee80211_sta *sta,
1928 struct iwl_lq_sta *lq_sta)
1929 {
1930 struct ieee80211_hw *hw = priv->hw;
1931 struct ieee80211_conf *conf = &hw->conf;
1932 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1933 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1934 int low = IWL_RATE_INVALID;
1935 int high = IWL_RATE_INVALID;
1936 int index;
1937 int i;
1938 struct iwl_rate_scale_data *window = NULL;
1939 int current_tpt = IWL_INVALID_VALUE;
1940 int low_tpt = IWL_INVALID_VALUE;
1941 int high_tpt = IWL_INVALID_VALUE;
1942 u32 fail_count;
1943 s8 scale_action = 0;
1944 u16 rate_mask;
1945 u8 update_lq = 0;
1946 struct iwl_scale_tbl_info *tbl, *tbl1;
1947 u16 rate_scale_index_msk = 0;
1948 u32 rate;
1949 u8 is_green = 0;
1950 u8 active_tbl = 0;
1951 u8 done_search = 0;
1952 u16 high_low;
1953 s32 sr;
1954 u8 tid = MAX_TID_COUNT;
1955 struct iwl_tid_data *tid_data;
1956
1957 IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
1958
1959 /* Send management frames and NO_ACK data using lowest rate. */
1960 /* TODO: this could probably be improved.. */
1961 if (!ieee80211_is_data(hdr->frame_control) ||
1962 info->flags & IEEE80211_TX_CTL_NO_ACK)
1963 return;
1964
1965 if (!sta || !lq_sta)
1966 return;
1967
1968 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
1969
1970 tid = rs_tl_add_packet(lq_sta, hdr);
1971 if ((tid != MAX_TID_COUNT) && (lq_sta->tx_agg_tid_en & (1 << tid))) {
1972 tid_data = &priv->stations[lq_sta->lq.sta_id].tid[tid];
1973 if (tid_data->agg.state == IWL_AGG_OFF)
1974 lq_sta->is_agg = 0;
1975 else
1976 lq_sta->is_agg = 1;
1977 } else
1978 lq_sta->is_agg = 0;
1979
1980 /*
1981 * Select rate-scale / modulation-mode table to work with in
1982 * the rest of this function: "search" if searching for better
1983 * modulation mode, or "active" if doing rate scaling within a mode.
1984 */
1985 if (!lq_sta->search_better_tbl)
1986 active_tbl = lq_sta->active_tbl;
1987 else
1988 active_tbl = 1 - lq_sta->active_tbl;
1989
1990 tbl = &(lq_sta->lq_info[active_tbl]);
1991 if (is_legacy(tbl->lq_type))
1992 lq_sta->is_green = 0;
1993 else
1994 lq_sta->is_green = rs_use_green(sta, &priv->current_ht_config);
1995 is_green = lq_sta->is_green;
1996
1997 /* current tx rate */
1998 index = lq_sta->last_txrate_idx;
1999
2000 IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2001 tbl->lq_type);
2002
2003 /* rates available for this association, and for modulation mode */
2004 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2005
2006 IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
2007
2008 /* mask with station rate restriction */
2009 if (is_legacy(tbl->lq_type)) {
2010 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2011 /* supp_rates has no CCK bits in A mode */
2012 rate_scale_index_msk = (u16) (rate_mask &
2013 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2014 else
2015 rate_scale_index_msk = (u16) (rate_mask &
2016 lq_sta->supp_rates);
2017
2018 } else
2019 rate_scale_index_msk = rate_mask;
2020
2021 if (!rate_scale_index_msk)
2022 rate_scale_index_msk = rate_mask;
2023
2024 if (!((1 << index) & rate_scale_index_msk)) {
2025 IWL_ERR(priv, "Current Rate is not valid\n");
2026 if (lq_sta->search_better_tbl) {
2027 /* revert to active table if search table is not valid*/
2028 tbl->lq_type = LQ_NONE;
2029 lq_sta->search_better_tbl = 0;
2030 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2031 /* get "active" rate info */
2032 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2033 rate = rs_update_rate_tbl(priv, lq_sta,
2034 tbl, index, is_green);
2035 }
2036 return;
2037 }
2038
2039 /* Get expected throughput table and history window for current rate */
2040 if (!tbl->expected_tpt) {
2041 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2042 return;
2043 }
2044
2045 /* force user max rate if set by user */
2046 if ((lq_sta->max_rate_idx != -1) &&
2047 (lq_sta->max_rate_idx < index)) {
2048 index = lq_sta->max_rate_idx;
2049 update_lq = 1;
2050 window = &(tbl->win[index]);
2051 goto lq_update;
2052 }
2053
2054 window = &(tbl->win[index]);
2055
2056 /*
2057 * If there is not enough history to calculate actual average
2058 * throughput, keep analyzing results of more tx frames, without
2059 * changing rate or mode (bypass most of the rest of this function).
2060 * Set up new rate table in uCode only if old rate is not supported
2061 * in current association (use new rate found above).
2062 */
2063 fail_count = window->counter - window->success_counter;
2064 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2065 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2066 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2067 "for index %d\n",
2068 window->success_counter, window->counter, index);
2069
2070 /* Can't calculate this yet; not enough history */
2071 window->average_tpt = IWL_INVALID_VALUE;
2072
2073 /* Should we stay with this modulation mode,
2074 * or search for a new one? */
2075 rs_stay_in_table(lq_sta);
2076
2077 goto out;
2078 }
2079 /* Else we have enough samples; calculate estimate of
2080 * actual average throughput */
2081
2082 /* Sanity-check TPT calculations */
2083 BUG_ON(window->average_tpt != ((window->success_ratio *
2084 tbl->expected_tpt[index] + 64) / 128));
2085
2086 /* If we are searching for better modulation mode, check success. */
2087 if (lq_sta->search_better_tbl &&
2088 (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
2089 /* If good success, continue using the "search" mode;
2090 * no need to send new link quality command, since we're
2091 * continuing to use the setup that we've been trying. */
2092 if (window->average_tpt > lq_sta->last_tpt) {
2093
2094 IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2095 "suc=%d cur-tpt=%d old-tpt=%d\n",
2096 window->success_ratio,
2097 window->average_tpt,
2098 lq_sta->last_tpt);
2099
2100 if (!is_legacy(tbl->lq_type))
2101 lq_sta->enable_counter = 1;
2102
2103 /* Swap tables; "search" becomes "active" */
2104 lq_sta->active_tbl = active_tbl;
2105 current_tpt = window->average_tpt;
2106
2107 /* Else poor success; go back to mode in "active" table */
2108 } else {
2109
2110 IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2111 "suc=%d cur-tpt=%d old-tpt=%d\n",
2112 window->success_ratio,
2113 window->average_tpt,
2114 lq_sta->last_tpt);
2115
2116 /* Nullify "search" table */
2117 tbl->lq_type = LQ_NONE;
2118
2119 /* Revert to "active" table */
2120 active_tbl = lq_sta->active_tbl;
2121 tbl = &(lq_sta->lq_info[active_tbl]);
2122
2123 /* Revert to "active" rate and throughput info */
2124 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2125 current_tpt = lq_sta->last_tpt;
2126
2127 /* Need to set up a new rate table in uCode */
2128 update_lq = 1;
2129 }
2130
2131 /* Either way, we've made a decision; modulation mode
2132 * search is done, allow rate adjustment next time. */
2133 lq_sta->search_better_tbl = 0;
2134 done_search = 1; /* Don't switch modes below! */
2135 goto lq_update;
2136 }
2137
2138 /* (Else) not in search of better modulation mode, try for better
2139 * starting rate, while staying in this mode. */
2140 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2141 tbl->lq_type);
2142 low = high_low & 0xff;
2143 high = (high_low >> 8) & 0xff;
2144
2145 /* If user set max rate, dont allow higher than user constrain */
2146 if ((lq_sta->max_rate_idx != -1) &&
2147 (lq_sta->max_rate_idx < high))
2148 high = IWL_RATE_INVALID;
2149
2150 sr = window->success_ratio;
2151
2152 /* Collect measured throughputs for current and adjacent rates */
2153 current_tpt = window->average_tpt;
2154 if (low != IWL_RATE_INVALID)
2155 low_tpt = tbl->win[low].average_tpt;
2156 if (high != IWL_RATE_INVALID)
2157 high_tpt = tbl->win[high].average_tpt;
2158
2159 scale_action = 0;
2160
2161 /* Too many failures, decrease rate */
2162 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2163 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2164 scale_action = -1;
2165
2166 /* No throughput measured yet for adjacent rates; try increase. */
2167 } else if ((low_tpt == IWL_INVALID_VALUE) &&
2168 (high_tpt == IWL_INVALID_VALUE)) {
2169
2170 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2171 scale_action = 1;
2172 else if (low != IWL_RATE_INVALID)
2173 scale_action = 0;
2174 }
2175
2176 /* Both adjacent throughputs are measured, but neither one has better
2177 * throughput; we're using the best rate, don't change it! */
2178 else if ((low_tpt != IWL_INVALID_VALUE) &&
2179 (high_tpt != IWL_INVALID_VALUE) &&
2180 (low_tpt < current_tpt) &&
2181 (high_tpt < current_tpt))
2182 scale_action = 0;
2183
2184 /* At least one adjacent rate's throughput is measured,
2185 * and may have better performance. */
2186 else {
2187 /* Higher adjacent rate's throughput is measured */
2188 if (high_tpt != IWL_INVALID_VALUE) {
2189 /* Higher rate has better throughput */
2190 if (high_tpt > current_tpt &&
2191 sr >= IWL_RATE_INCREASE_TH) {
2192 scale_action = 1;
2193 } else {
2194 scale_action = 0;
2195 }
2196
2197 /* Lower adjacent rate's throughput is measured */
2198 } else if (low_tpt != IWL_INVALID_VALUE) {
2199 /* Lower rate has better throughput */
2200 if (low_tpt > current_tpt) {
2201 IWL_DEBUG_RATE(priv,
2202 "decrease rate because of low tpt\n");
2203 scale_action = -1;
2204 } else if (sr >= IWL_RATE_INCREASE_TH) {
2205 scale_action = 1;
2206 }
2207 }
2208 }
2209
2210 /* Sanity check; asked for decrease, but success rate or throughput
2211 * has been good at old rate. Don't change it. */
2212 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2213 ((sr > IWL_RATE_HIGH_TH) ||
2214 (current_tpt > (100 * tbl->expected_tpt[low]))))
2215 scale_action = 0;
2216 if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2217 scale_action = -1;
2218 if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
2219 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2220 scale_action = -1;
2221 switch (scale_action) {
2222 case -1:
2223 /* Decrease starting rate, update uCode's rate table */
2224 if (low != IWL_RATE_INVALID) {
2225 update_lq = 1;
2226 index = low;
2227 }
2228
2229 break;
2230 case 1:
2231 /* Increase starting rate, update uCode's rate table */
2232 if (high != IWL_RATE_INVALID) {
2233 update_lq = 1;
2234 index = high;
2235 }
2236
2237 break;
2238 case 0:
2239 /* No change */
2240 default:
2241 break;
2242 }
2243
2244 IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2245 "high %d type %d\n",
2246 index, scale_action, low, high, tbl->lq_type);
2247
2248 lq_update:
2249 /* Replace uCode's rate table for the destination station. */
2250 if (update_lq)
2251 rate = rs_update_rate_tbl(priv, lq_sta,
2252 tbl, index, is_green);
2253
2254 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
2255 /* Should we stay with this modulation mode,
2256 * or search for a new one? */
2257 rs_stay_in_table(lq_sta);
2258 }
2259 /*
2260 * Search for new modulation mode if we're:
2261 * 1) Not changing rates right now
2262 * 2) Not just finishing up a search
2263 * 3) Allowing a new search
2264 */
2265 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2266 /* Save current throughput to compare with "search" throughput*/
2267 lq_sta->last_tpt = current_tpt;
2268
2269 /* Select a new "search" modulation mode to try.
2270 * If one is found, set up the new "search" table. */
2271 if (is_legacy(tbl->lq_type))
2272 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2273 else if (is_siso(tbl->lq_type))
2274 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2275 else if (is_mimo2(tbl->lq_type))
2276 rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2277 else
2278 rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2279
2280 /* If new "search" mode was selected, set up in uCode table */
2281 if (lq_sta->search_better_tbl) {
2282 /* Access the "search" table, clear its history. */
2283 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2284 for (i = 0; i < IWL_RATE_COUNT; i++)
2285 rs_rate_scale_clear_window(&(tbl->win[i]));
2286
2287 /* Use new "search" start rate */
2288 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2289
2290 IWL_DEBUG_RATE(priv, "Switch current mcs: %X index: %d\n",
2291 tbl->current_rate, index);
2292 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2293 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC, false);
2294 } else
2295 done_search = 1;
2296 }
2297
2298 if (done_search && !lq_sta->stay_in_tbl) {
2299 /* If the "active" (non-search) mode was legacy,
2300 * and we've tried switching antennas,
2301 * but we haven't been able to try HT modes (not available),
2302 * stay with best antenna legacy modulation for a while
2303 * before next round of mode comparisons. */
2304 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2305 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2306 lq_sta->action_counter > tbl1->max_search) {
2307 IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2308 rs_set_stay_in_table(priv, 1, lq_sta);
2309 }
2310
2311 /* If we're in an HT mode, and all 3 mode switch actions
2312 * have been tried and compared, stay in this best modulation
2313 * mode for a while before next round of mode comparisons. */
2314 if (lq_sta->enable_counter &&
2315 (lq_sta->action_counter >= tbl1->max_search) &&
2316 iwl_ht_enabled(priv)) {
2317 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2318 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2319 (tid != MAX_TID_COUNT)) {
2320 tid_data =
2321 &priv->stations[lq_sta->lq.sta_id].tid[tid];
2322 if (tid_data->agg.state == IWL_AGG_OFF) {
2323 IWL_DEBUG_RATE(priv,
2324 "try to aggregate tid %d\n",
2325 tid);
2326 rs_tl_turn_on_agg(priv, tid,
2327 lq_sta, sta);
2328 }
2329 }
2330 rs_set_stay_in_table(priv, 0, lq_sta);
2331 }
2332 }
2333
2334 out:
2335 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2336 i = index;
2337 lq_sta->last_txrate_idx = i;
2338
2339 return;
2340 }
2341
2342 /**
2343 * rs_initialize_lq - Initialize a station's hardware rate table
2344 *
2345 * The uCode's station table contains a table of fallback rates
2346 * for automatic fallback during transmission.
2347 *
2348 * NOTE: This sets up a default set of values. These will be replaced later
2349 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2350 * rc80211_simple.
2351 *
2352 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2353 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2354 * which requires station table entry to exist).
2355 */
2356 static void rs_initialize_lq(struct iwl_priv *priv,
2357 struct ieee80211_conf *conf,
2358 struct ieee80211_sta *sta,
2359 struct iwl_lq_sta *lq_sta)
2360 {
2361 struct iwl_scale_tbl_info *tbl;
2362 int rate_idx;
2363 int i;
2364 u32 rate;
2365 u8 use_green = rs_use_green(sta, &priv->current_ht_config);
2366 u8 active_tbl = 0;
2367 u8 valid_tx_ant;
2368
2369 if (!sta || !lq_sta)
2370 goto out;
2371
2372 i = lq_sta->last_txrate_idx;
2373
2374 valid_tx_ant = priv->hw_params.valid_tx_ant;
2375
2376 if (!lq_sta->search_better_tbl)
2377 active_tbl = lq_sta->active_tbl;
2378 else
2379 active_tbl = 1 - lq_sta->active_tbl;
2380
2381 tbl = &(lq_sta->lq_info[active_tbl]);
2382
2383 if ((i < 0) || (i >= IWL_RATE_COUNT))
2384 i = 0;
2385
2386 rate = iwl_rates[i].plcp;
2387 tbl->ant_type = first_antenna(valid_tx_ant);
2388 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2389
2390 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2391 rate |= RATE_MCS_CCK_MSK;
2392
2393 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2394 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2395 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2396
2397 rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2398 tbl->current_rate = rate;
2399 rs_set_expected_tpt_table(lq_sta, tbl);
2400 rs_fill_link_cmd(NULL, lq_sta, rate);
2401 priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2402 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_SYNC, true);
2403 out:
2404 return;
2405 }
2406
2407 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2408 struct ieee80211_tx_rate_control *txrc)
2409 {
2410
2411 struct sk_buff *skb = txrc->skb;
2412 struct ieee80211_supported_band *sband = txrc->sband;
2413 struct iwl_priv *priv __maybe_unused = (struct iwl_priv *)priv_r;
2414 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2415 struct iwl_lq_sta *lq_sta = priv_sta;
2416 int rate_idx;
2417
2418 IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2419
2420 /* Get max rate if user set max rate */
2421 if (lq_sta) {
2422 lq_sta->max_rate_idx = txrc->max_rate_idx;
2423 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2424 (lq_sta->max_rate_idx != -1))
2425 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2426 if ((lq_sta->max_rate_idx < 0) ||
2427 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2428 lq_sta->max_rate_idx = -1;
2429 }
2430
2431 /* Treat uninitialized rate scaling data same as non-existing. */
2432 if (lq_sta && !lq_sta->drv) {
2433 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
2434 priv_sta = NULL;
2435 }
2436
2437 /* Send management frames and NO_ACK data using lowest rate. */
2438 if (rate_control_send_low(sta, priv_sta, txrc))
2439 return;
2440
2441 rate_idx = lq_sta->last_txrate_idx;
2442
2443 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2444 rate_idx -= IWL_FIRST_OFDM_RATE;
2445 /* 6M and 9M shared same MCS index */
2446 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2447 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2448 IWL_RATE_MIMO3_6M_PLCP)
2449 rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2450 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2451 IWL_RATE_MIMO2_6M_PLCP)
2452 rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2453 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2454 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2455 info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2456 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2457 info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
2458 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2459 info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2460 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2461 info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2462 } else {
2463 /* Check for invalid rates */
2464 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2465 ((sband->band == IEEE80211_BAND_5GHZ) &&
2466 (rate_idx < IWL_FIRST_OFDM_RATE)))
2467 rate_idx = rate_lowest_index(sband, sta);
2468 /* On valid 5 GHz rate, adjust index */
2469 else if (sband->band == IEEE80211_BAND_5GHZ)
2470 rate_idx -= IWL_FIRST_OFDM_RATE;
2471 info->control.rates[0].flags = 0;
2472 }
2473 info->control.rates[0].idx = rate_idx;
2474
2475 }
2476
2477 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2478 gfp_t gfp)
2479 {
2480 struct iwl_lq_sta *lq_sta;
2481 struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2482 struct iwl_priv *priv;
2483
2484 priv = (struct iwl_priv *)priv_rate;
2485 IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2486
2487 lq_sta = &sta_priv->lq_sta;
2488
2489 return lq_sta;
2490 }
2491
2492 /*
2493 * Called after adding a new station to initialize rate scaling
2494 */
2495 void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id)
2496 {
2497 int i, j;
2498 struct ieee80211_hw *hw = priv->hw;
2499 struct ieee80211_conf *conf = &priv->hw->conf;
2500 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2501 struct iwl_station_priv *sta_priv;
2502 struct iwl_lq_sta *lq_sta;
2503 struct ieee80211_supported_band *sband;
2504
2505 sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2506 lq_sta = &sta_priv->lq_sta;
2507 sband = hw->wiphy->bands[conf->channel->band];
2508
2509
2510 lq_sta->lq.sta_id = sta_id;
2511
2512 for (j = 0; j < LQ_SIZE; j++)
2513 for (i = 0; i < IWL_RATE_COUNT; i++)
2514 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2515
2516 lq_sta->flush_timer = 0;
2517 lq_sta->supp_rates = sta->supp_rates[sband->band];
2518 for (j = 0; j < LQ_SIZE; j++)
2519 for (i = 0; i < IWL_RATE_COUNT; i++)
2520 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2521
2522 IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n",
2523 sta_id);
2524 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2525 * the lowest or the highest rate.. Could consider using RSSI from
2526 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2527 * after assoc.. */
2528
2529 lq_sta->is_dup = 0;
2530 lq_sta->max_rate_idx = -1;
2531 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2532 lq_sta->is_green = rs_use_green(sta, &priv->current_ht_config);
2533 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2534 lq_sta->band = priv->band;
2535 /*
2536 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2537 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2538 */
2539 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2540 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2541 lq_sta->active_siso_rate &= ~((u16)0x2);
2542 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2543
2544 /* Same here */
2545 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2546 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2547 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2548 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2549
2550 lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2551 lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2552 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2553 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2554
2555 IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2556 lq_sta->active_siso_rate,
2557 lq_sta->active_mimo2_rate,
2558 lq_sta->active_mimo3_rate);
2559
2560 /* These values will be overridden later */
2561 lq_sta->lq.general_params.single_stream_ant_msk =
2562 first_antenna(priv->hw_params.valid_tx_ant);
2563 lq_sta->lq.general_params.dual_stream_ant_msk =
2564 priv->hw_params.valid_tx_ant &
2565 ~first_antenna(priv->hw_params.valid_tx_ant);
2566 if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2567 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2568 } else if (num_of_ant(priv->hw_params.valid_tx_ant) == 2) {
2569 lq_sta->lq.general_params.dual_stream_ant_msk =
2570 priv->hw_params.valid_tx_ant;
2571 }
2572
2573 /* as default allow aggregation for all tids */
2574 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2575 lq_sta->drv = priv;
2576
2577 /* Set last_txrate_idx to lowest rate */
2578 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2579 if (sband->band == IEEE80211_BAND_5GHZ)
2580 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2581 lq_sta->is_agg = 0;
2582
2583 rs_initialize_lq(priv, conf, sta, lq_sta);
2584 }
2585
2586 static void rs_fill_link_cmd(struct iwl_priv *priv,
2587 struct iwl_lq_sta *lq_sta, u32 new_rate)
2588 {
2589 struct iwl_scale_tbl_info tbl_type;
2590 int index = 0;
2591 int rate_idx;
2592 int repeat_rate = 0;
2593 u8 ant_toggle_cnt = 0;
2594 u8 use_ht_possible = 1;
2595 u8 valid_tx_ant = 0;
2596 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2597
2598 /* Override starting rate (index 0) if needed for debug purposes */
2599 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2600
2601 /* Interpret new_rate (rate_n_flags) */
2602 memset(&tbl_type, 0, sizeof(tbl_type));
2603 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2604 &tbl_type, &rate_idx);
2605
2606 /* How many times should we repeat the initial rate? */
2607 if (is_legacy(tbl_type.lq_type)) {
2608 ant_toggle_cnt = 1;
2609 repeat_rate = IWL_NUMBER_TRY;
2610 } else {
2611 repeat_rate = IWL_HT_NUMBER_TRY;
2612 }
2613
2614 lq_cmd->general_params.mimo_delimiter =
2615 is_mimo(tbl_type.lq_type) ? 1 : 0;
2616
2617 /* Fill 1st table entry (index 0) */
2618 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2619
2620 if (num_of_ant(tbl_type.ant_type) == 1) {
2621 lq_cmd->general_params.single_stream_ant_msk =
2622 tbl_type.ant_type;
2623 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2624 lq_cmd->general_params.dual_stream_ant_msk =
2625 tbl_type.ant_type;
2626 } /* otherwise we don't modify the existing value */
2627
2628 index++;
2629 repeat_rate--;
2630
2631 if (priv)
2632 valid_tx_ant = priv->hw_params.valid_tx_ant;
2633
2634 /* Fill rest of rate table */
2635 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2636 /* Repeat initial/next rate.
2637 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2638 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2639 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2640 if (is_legacy(tbl_type.lq_type)) {
2641 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2642 ant_toggle_cnt++;
2643 else if (priv &&
2644 rs_toggle_antenna(valid_tx_ant,
2645 &new_rate, &tbl_type))
2646 ant_toggle_cnt = 1;
2647 }
2648
2649 /* Override next rate if needed for debug purposes */
2650 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2651
2652 /* Fill next table entry */
2653 lq_cmd->rs_table[index].rate_n_flags =
2654 cpu_to_le32(new_rate);
2655 repeat_rate--;
2656 index++;
2657 }
2658
2659 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2660 &rate_idx);
2661
2662 /* Indicate to uCode which entries might be MIMO.
2663 * If initial rate was MIMO, this will finally end up
2664 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2665 if (is_mimo(tbl_type.lq_type))
2666 lq_cmd->general_params.mimo_delimiter = index;
2667
2668 /* Get next rate */
2669 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2670 use_ht_possible);
2671
2672 /* How many times should we repeat the next rate? */
2673 if (is_legacy(tbl_type.lq_type)) {
2674 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2675 ant_toggle_cnt++;
2676 else if (priv &&
2677 rs_toggle_antenna(valid_tx_ant,
2678 &new_rate, &tbl_type))
2679 ant_toggle_cnt = 1;
2680
2681 repeat_rate = IWL_NUMBER_TRY;
2682 } else {
2683 repeat_rate = IWL_HT_NUMBER_TRY;
2684 }
2685
2686 /* Don't allow HT rates after next pass.
2687 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2688 use_ht_possible = 0;
2689
2690 /* Override next rate if needed for debug purposes */
2691 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2692
2693 /* Fill next table entry */
2694 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2695
2696 index++;
2697 repeat_rate--;
2698 }
2699
2700 lq_cmd->agg_params.agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2701 lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2702 lq_cmd->agg_params.agg_time_limit =
2703 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2704 }
2705
2706 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2707 {
2708 return hw->priv;
2709 }
2710 /* rate scale requires free function to be implemented */
2711 static void rs_free(void *priv_rate)
2712 {
2713 return;
2714 }
2715
2716 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
2717 void *priv_sta)
2718 {
2719 struct iwl_priv *priv __maybe_unused = priv_r;
2720
2721 IWL_DEBUG_RATE(priv, "enter\n");
2722 IWL_DEBUG_RATE(priv, "leave\n");
2723 }
2724
2725
2726 #ifdef CONFIG_MAC80211_DEBUGFS
2727 static int open_file_generic(struct inode *inode, struct file *file)
2728 {
2729 file->private_data = inode->i_private;
2730 return 0;
2731 }
2732 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2733 u32 *rate_n_flags, int index)
2734 {
2735 struct iwl_priv *priv;
2736 u8 valid_tx_ant;
2737 u8 ant_sel_tx;
2738
2739 priv = lq_sta->drv;
2740 valid_tx_ant = priv->hw_params.valid_tx_ant;
2741 if (lq_sta->dbg_fixed_rate) {
2742 ant_sel_tx =
2743 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
2744 >> RATE_MCS_ANT_POS);
2745 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
2746 *rate_n_flags = lq_sta->dbg_fixed_rate;
2747 IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
2748 } else {
2749 lq_sta->dbg_fixed_rate = 0;
2750 IWL_ERR(priv,
2751 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
2752 ant_sel_tx, valid_tx_ant);
2753 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
2754 }
2755 } else {
2756 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
2757 }
2758 }
2759
2760 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2761 const char __user *user_buf, size_t count, loff_t *ppos)
2762 {
2763 struct iwl_lq_sta *lq_sta = file->private_data;
2764 struct iwl_priv *priv;
2765 char buf[64];
2766 int buf_size;
2767 u32 parsed_rate;
2768
2769 priv = lq_sta->drv;
2770 memset(buf, 0, sizeof(buf));
2771 buf_size = min(count, sizeof(buf) - 1);
2772 if (copy_from_user(buf, user_buf, buf_size))
2773 return -EFAULT;
2774
2775 if (sscanf(buf, "%x", &parsed_rate) == 1)
2776 lq_sta->dbg_fixed_rate = parsed_rate;
2777 else
2778 lq_sta->dbg_fixed_rate = 0;
2779
2780 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2781 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2782 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2783 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2784
2785 IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
2786 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2787
2788 if (lq_sta->dbg_fixed_rate) {
2789 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2790 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC, false);
2791 }
2792
2793 return count;
2794 }
2795
2796 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2797 char __user *user_buf, size_t count, loff_t *ppos)
2798 {
2799 char *buff;
2800 int desc = 0;
2801 int i = 0;
2802 int index = 0;
2803 ssize_t ret;
2804
2805 struct iwl_lq_sta *lq_sta = file->private_data;
2806 struct iwl_priv *priv;
2807 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2808
2809 priv = lq_sta->drv;
2810 buff = kmalloc(1024, GFP_KERNEL);
2811 if (!buff)
2812 return -ENOMEM;
2813
2814 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2815 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2816 lq_sta->total_failed, lq_sta->total_success,
2817 lq_sta->active_legacy_rate);
2818 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2819 lq_sta->dbg_fixed_rate);
2820 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
2821 (priv->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
2822 (priv->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
2823 (priv->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
2824 desc += sprintf(buff+desc, "lq type %s\n",
2825 (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
2826 if (is_Ht(tbl->lq_type)) {
2827 desc += sprintf(buff+desc, " %s",
2828 (is_siso(tbl->lq_type)) ? "SISO" :
2829 ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
2830 desc += sprintf(buff+desc, " %s",
2831 (tbl->is_ht40) ? "40MHz" : "20MHz");
2832 desc += sprintf(buff+desc, " %s %s %s\n", (tbl->is_SGI) ? "SGI" : "",
2833 (lq_sta->is_green) ? "GF enabled" : "",
2834 (lq_sta->is_agg) ? "AGG on" : "");
2835 }
2836 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
2837 lq_sta->last_rate_n_flags);
2838 desc += sprintf(buff+desc, "general:"
2839 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2840 lq_sta->lq.general_params.flags,
2841 lq_sta->lq.general_params.mimo_delimiter,
2842 lq_sta->lq.general_params.single_stream_ant_msk,
2843 lq_sta->lq.general_params.dual_stream_ant_msk);
2844
2845 desc += sprintf(buff+desc, "agg:"
2846 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2847 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2848 lq_sta->lq.agg_params.agg_dis_start_th,
2849 lq_sta->lq.agg_params.agg_frame_cnt_limit);
2850
2851 desc += sprintf(buff+desc,
2852 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2853 lq_sta->lq.general_params.start_rate_index[0],
2854 lq_sta->lq.general_params.start_rate_index[1],
2855 lq_sta->lq.general_params.start_rate_index[2],
2856 lq_sta->lq.general_params.start_rate_index[3]);
2857
2858 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2859 index = iwl_hwrate_to_plcp_idx(
2860 le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2861 if (is_legacy(tbl->lq_type)) {
2862 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
2863 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
2864 iwl_rate_mcs[index].mbps);
2865 } else {
2866 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
2867 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
2868 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
2869 }
2870 }
2871
2872 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2873 kfree(buff);
2874 return ret;
2875 }
2876
2877 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2878 .write = rs_sta_dbgfs_scale_table_write,
2879 .read = rs_sta_dbgfs_scale_table_read,
2880 .open = open_file_generic,
2881 };
2882 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2883 char __user *user_buf, size_t count, loff_t *ppos)
2884 {
2885 char *buff;
2886 int desc = 0;
2887 int i, j;
2888 ssize_t ret;
2889
2890 struct iwl_lq_sta *lq_sta = file->private_data;
2891
2892 buff = kmalloc(1024, GFP_KERNEL);
2893 if (!buff)
2894 return -ENOMEM;
2895
2896 for (i = 0; i < LQ_SIZE; i++) {
2897 desc += sprintf(buff+desc,
2898 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
2899 "rate=0x%X\n",
2900 lq_sta->active_tbl == i ? "*" : "x",
2901 lq_sta->lq_info[i].lq_type,
2902 lq_sta->lq_info[i].is_SGI,
2903 lq_sta->lq_info[i].is_ht40,
2904 lq_sta->lq_info[i].is_dup,
2905 lq_sta->is_green,
2906 lq_sta->lq_info[i].current_rate);
2907 for (j = 0; j < IWL_RATE_COUNT; j++) {
2908 desc += sprintf(buff+desc,
2909 "counter=%d success=%d %%=%d\n",
2910 lq_sta->lq_info[i].win[j].counter,
2911 lq_sta->lq_info[i].win[j].success_counter,
2912 lq_sta->lq_info[i].win[j].success_ratio);
2913 }
2914 }
2915 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2916 kfree(buff);
2917 return ret;
2918 }
2919
2920 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2921 .read = rs_sta_dbgfs_stats_table_read,
2922 .open = open_file_generic,
2923 };
2924
2925 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
2926 char __user *user_buf, size_t count, loff_t *ppos)
2927 {
2928 char buff[120];
2929 int desc = 0;
2930 ssize_t ret;
2931
2932 struct iwl_lq_sta *lq_sta = file->private_data;
2933 struct iwl_priv *priv;
2934 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
2935
2936 priv = lq_sta->drv;
2937
2938 if (is_Ht(tbl->lq_type))
2939 desc += sprintf(buff+desc,
2940 "Bit Rate= %d Mb/s\n",
2941 tbl->expected_tpt[lq_sta->last_txrate_idx]);
2942 else
2943 desc += sprintf(buff+desc,
2944 "Bit Rate= %d Mb/s\n",
2945 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
2946
2947 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2948 return ret;
2949 }
2950
2951 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
2952 .read = rs_sta_dbgfs_rate_scale_data_read,
2953 .open = open_file_generic,
2954 };
2955
2956 static void rs_add_debugfs(void *priv, void *priv_sta,
2957 struct dentry *dir)
2958 {
2959 struct iwl_lq_sta *lq_sta = priv_sta;
2960 lq_sta->rs_sta_dbgfs_scale_table_file =
2961 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
2962 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2963 lq_sta->rs_sta_dbgfs_stats_table_file =
2964 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
2965 lq_sta, &rs_sta_dbgfs_stats_table_ops);
2966 lq_sta->rs_sta_dbgfs_rate_scale_data_file =
2967 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
2968 lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
2969 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2970 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
2971 &lq_sta->tx_agg_tid_en);
2972
2973 }
2974
2975 static void rs_remove_debugfs(void *priv, void *priv_sta)
2976 {
2977 struct iwl_lq_sta *lq_sta = priv_sta;
2978 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2979 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2980 debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
2981 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2982 }
2983 #endif
2984
2985 /*
2986 * Initialization of rate scaling information is done by driver after
2987 * the station is added. Since mac80211 calls this function before a
2988 * station is added we ignore it.
2989 */
2990 static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband,
2991 struct ieee80211_sta *sta, void *priv_sta)
2992 {
2993 }
2994 static struct rate_control_ops rs_ops = {
2995 .module = NULL,
2996 .name = RS_NAME,
2997 .tx_status = rs_tx_status,
2998 .get_rate = rs_get_rate,
2999 .rate_init = rs_rate_init_stub,
3000 .alloc = rs_alloc,
3001 .free = rs_free,
3002 .alloc_sta = rs_alloc_sta,
3003 .free_sta = rs_free_sta,
3004 #ifdef CONFIG_MAC80211_DEBUGFS
3005 .add_sta_debugfs = rs_add_debugfs,
3006 .remove_sta_debugfs = rs_remove_debugfs,
3007 #endif
3008 };
3009
3010 int iwlagn_rate_control_register(void)
3011 {
3012 return ieee80211_rate_control_register(&rs_ops);
3013 }
3014
3015 void iwlagn_rate_control_unregister(void)
3016 {
3017 ieee80211_rate_control_unregister(&rs_ops);
3018 }
3019
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree