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iwlwifi: Fix error: struct iwl_lq_sta has no member named dbg_fixed_rate
[linux-2.6.git] / drivers / net / wireless / iwlwifi / iwl-agn-rs.c
blob75fcd30a7c13fbbd22e7a276f8e612c096a2a53b
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 #include "iwl-agn.h"
43
44 #define RS_NAME "iwl-agn-rs"
45
46 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
47 #define IWL_NUMBER_TRY 1
48 #define IWL_HT_NUMBER_TRY 3
49
50 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
51 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
52 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
53
54 /* max allowed rate miss before sync LQ cmd */
55 #define IWL_MISSED_RATE_MAX 15
56 /* max time to accum history 2 seconds */
57 #define IWL_RATE_SCALE_FLUSH_INTVL (3*HZ)
58
59 static u8 rs_ht_to_legacy[] = {
60 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
61 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
62 IWL_RATE_6M_INDEX,
63 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
64 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
65 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
66 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
67 };
68
69 static const u8 ant_toggle_lookup[] = {
70 /*ANT_NONE -> */ ANT_NONE,
71 /*ANT_A -> */ ANT_B,
72 /*ANT_B -> */ ANT_C,
73 /*ANT_AB -> */ ANT_BC,
74 /*ANT_C -> */ ANT_A,
75 /*ANT_AC -> */ ANT_AB,
76 /*ANT_BC -> */ ANT_AC,
77 /*ANT_ABC -> */ ANT_ABC,
78 };
79
80 #define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np) \
81 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
82 IWL_RATE_SISO_##s##M_PLCP, \
83 IWL_RATE_MIMO2_##s##M_PLCP,\
84 IWL_RATE_MIMO3_##s##M_PLCP,\
85 IWL_RATE_##r##M_IEEE, \
86 IWL_RATE_##ip##M_INDEX, \
87 IWL_RATE_##in##M_INDEX, \
88 IWL_RATE_##rp##M_INDEX, \
89 IWL_RATE_##rn##M_INDEX, \
90 IWL_RATE_##pp##M_INDEX, \
91 IWL_RATE_##np##M_INDEX }
92
93 /*
94 * Parameter order:
95 * rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
96 *
97 * If there isn't a valid next or previous rate then INV is used which
98 * maps to IWL_RATE_INVALID
99 *
100 */
101 const struct iwl_rate_info iwl_rates[IWL_RATE_COUNT] = {
102 IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2), /* 1mbps */
103 IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5), /* 2mbps */
104 IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11), /*5.5mbps */
105 IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18), /* 11mbps */
106 IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11), /* 6mbps */
107 IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11), /* 9mbps */
108 IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18), /* 12mbps */
109 IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24), /* 18mbps */
110 IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36), /* 24mbps */
111 IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48), /* 36mbps */
112 IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54), /* 48mbps */
113 IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
114 IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
115 /* FIXME:RS: ^^ should be INV (legacy) */
116 };
117
118 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
119 {
120 int idx = 0;
121
122 /* HT rate format */
123 if (rate_n_flags & RATE_MCS_HT_MSK) {
124 idx = (rate_n_flags & 0xff);
125
126 if (idx >= IWL_RATE_MIMO3_6M_PLCP)
127 idx = idx - IWL_RATE_MIMO3_6M_PLCP;
128 else if (idx >= IWL_RATE_MIMO2_6M_PLCP)
129 idx = idx - IWL_RATE_MIMO2_6M_PLCP;
130
131 idx += IWL_FIRST_OFDM_RATE;
132 /* skip 9M not supported in ht*/
133 if (idx >= IWL_RATE_9M_INDEX)
134 idx += 1;
135 if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE))
136 return idx;
137
138 /* legacy rate format, search for match in table */
139 } else {
140 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
141 if (iwl_rates[idx].plcp == (rate_n_flags & 0xFF))
142 return idx;
143 }
144
145 return -1;
146 }
147
148 static void rs_rate_scale_perform(struct iwl_priv *priv,
149 struct sk_buff *skb,
150 struct ieee80211_sta *sta,
151 struct iwl_lq_sta *lq_sta);
152 static void rs_fill_link_cmd(struct iwl_priv *priv,
153 struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
154 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
155
156
157 #ifdef CONFIG_MAC80211_DEBUGFS
158 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
159 u32 *rate_n_flags, int index);
160 #else
161 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
162 u32 *rate_n_flags, int index)
163 {}
164 #endif
165
166 /**
167 * The following tables contain the expected throughput metrics for all rates
168 *
169 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
170 *
171 * where invalid entries are zeros.
172 *
173 * CCK rates are only valid in legacy table and will only be used in G
174 * (2.4 GHz) band.
175 */
176
177 static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
178 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
179 };
180
181 static s32 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
182 {0, 0, 0, 0, 42, 0, 76, 102, 124, 158, 183, 193, 202}, /* Norm */
183 {0, 0, 0, 0, 46, 0, 82, 110, 132, 167, 192, 202, 210}, /* SGI */
184 {0, 0, 0, 0, 48, 0, 93, 135, 176, 251, 319, 351, 381}, /* AGG */
185 {0, 0, 0, 0, 53, 0, 102, 149, 193, 275, 348, 381, 413}, /* AGG+SGI */
186 };
187
188 static s32 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
189 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
190 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
191 {0, 0, 0, 0, 96, 0, 182, 259, 328, 451, 553, 598, 640}, /* AGG */
192 {0, 0, 0, 0, 106, 0, 199, 282, 357, 487, 593, 640, 683}, /* AGG+SGI */
193 };
194
195 static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
196 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250}, /* Norm */
197 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256}, /* SGI */
198 {0, 0, 0, 0, 92, 0, 175, 250, 317, 436, 534, 578, 619}, /* AGG */
199 {0, 0, 0, 0, 102, 0, 192, 273, 344, 470, 573, 619, 660}, /* AGG+SGI*/
200 };
201
202 static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
203 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
204 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
205 {0, 0, 0, 0, 180, 0, 327, 446, 545, 708, 828, 878, 922}, /* AGG */
206 {0, 0, 0, 0, 197, 0, 355, 481, 584, 752, 872, 922, 966}, /* AGG+SGI */
207 };
208
209 static s32 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = {
210 {0, 0, 0, 0, 99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */
211 {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */
212 {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */
213 {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */
214 };
215
216 static s32 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = {
217 {0, 0, 0, 0, 152, 0, 211, 239, 255, 279, 290, 294, 297}, /* Norm */
218 {0, 0, 0, 0, 160, 0, 219, 245, 261, 284, 294, 297, 300}, /* SGI */
219 {0, 0, 0, 0, 254, 0, 443, 584, 695, 868, 984, 1030, 1070}, /* AGG */
220 {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */
221 };
222
223 /* mbps, mcs */
224 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
225 { "1", "BPSK DSSS"},
226 { "2", "QPSK DSSS"},
227 {"5.5", "BPSK CCK"},
228 { "11", "QPSK CCK"},
229 { "6", "BPSK 1/2"},
230 { "9", "BPSK 1/2"},
231 { "12", "QPSK 1/2"},
232 { "18", "QPSK 3/4"},
233 { "24", "16QAM 1/2"},
234 { "36", "16QAM 3/4"},
235 { "48", "64QAM 2/3"},
236 { "54", "64QAM 3/4"},
237 { "60", "64QAM 5/6"},
238 };
239
240 #define MCS_INDEX_PER_STREAM (8)
241
242 static inline u8 rs_extract_rate(u32 rate_n_flags)
243 {
244 return (u8)(rate_n_flags & 0xFF);
245 }
246
247 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
248 {
249 window->data = 0;
250 window->success_counter = 0;
251 window->success_ratio = IWL_INVALID_VALUE;
252 window->counter = 0;
253 window->average_tpt = IWL_INVALID_VALUE;
254 window->stamp = 0;
255 }
256
257 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
258 {
259 return (ant_type & valid_antenna) == ant_type;
260 }
261
262 /*
263 * removes the old data from the statistics. All data that is older than
264 * TID_MAX_TIME_DIFF, will be deleted.
265 */
266 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
267 {
268 /* The oldest age we want to keep */
269 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
270
271 while (tl->queue_count &&
272 (tl->time_stamp < oldest_time)) {
273 tl->total -= tl->packet_count[tl->head];
274 tl->packet_count[tl->head] = 0;
275 tl->time_stamp += TID_QUEUE_CELL_SPACING;
276 tl->queue_count--;
277 tl->head++;
278 if (tl->head >= TID_QUEUE_MAX_SIZE)
279 tl->head = 0;
280 }
281 }
282
283 /*
284 * increment traffic load value for tid and also remove
285 * any old values if passed the certain time period
286 */
287 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
288 struct ieee80211_hdr *hdr)
289 {
290 u32 curr_time = jiffies_to_msecs(jiffies);
291 u32 time_diff;
292 s32 index;
293 struct iwl_traffic_load *tl = NULL;
294 u8 tid;
295
296 if (ieee80211_is_data_qos(hdr->frame_control)) {
297 u8 *qc = ieee80211_get_qos_ctl(hdr);
298 tid = qc[0] & 0xf;
299 } else
300 return MAX_TID_COUNT;
301
302 if (unlikely(tid >= TID_MAX_LOAD_COUNT))
303 return MAX_TID_COUNT;
304
305 tl = &lq_data->load[tid];
306
307 curr_time -= curr_time % TID_ROUND_VALUE;
308
309 /* Happens only for the first packet. Initialize the data */
310 if (!(tl->queue_count)) {
311 tl->total = 1;
312 tl->time_stamp = curr_time;
313 tl->queue_count = 1;
314 tl->head = 0;
315 tl->packet_count[0] = 1;
316 return MAX_TID_COUNT;
317 }
318
319 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
320 index = time_diff / TID_QUEUE_CELL_SPACING;
321
322 /* The history is too long: remove data that is older than */
323 /* TID_MAX_TIME_DIFF */
324 if (index >= TID_QUEUE_MAX_SIZE)
325 rs_tl_rm_old_stats(tl, curr_time);
326
327 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
328 tl->packet_count[index] = tl->packet_count[index] + 1;
329 tl->total = tl->total + 1;
330
331 if ((index + 1) > tl->queue_count)
332 tl->queue_count = index + 1;
333
334 return tid;
335 }
336
337 /*
338 get the traffic load value for tid
339 */
340 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
341 {
342 u32 curr_time = jiffies_to_msecs(jiffies);
343 u32 time_diff;
344 s32 index;
345 struct iwl_traffic_load *tl = NULL;
346
347 if (tid >= TID_MAX_LOAD_COUNT)
348 return 0;
349
350 tl = &(lq_data->load[tid]);
351
352 curr_time -= curr_time % TID_ROUND_VALUE;
353
354 if (!(tl->queue_count))
355 return 0;
356
357 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
358 index = time_diff / TID_QUEUE_CELL_SPACING;
359
360 /* The history is too long: remove data that is older than */
361 /* TID_MAX_TIME_DIFF */
362 if (index >= TID_QUEUE_MAX_SIZE)
363 rs_tl_rm_old_stats(tl, curr_time);
364
365 return tl->total;
366 }
367
368 static int rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
369 struct iwl_lq_sta *lq_data, u8 tid,
370 struct ieee80211_sta *sta)
371 {
372 int ret = -EAGAIN;
373 u32 load;
374
375 /*
376 * Don't create TX aggregation sessions when in high
377 * BT traffic, as they would just be disrupted by BT.
378 */
379 if (priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) {
380 IWL_ERR(priv, "BT traffic (%d), no aggregation allowed\n",
381 priv->bt_traffic_load);
382 return ret;
383 }
384
385 load = rs_tl_get_load(lq_data, tid);
386
387 if (load > IWL_AGG_LOAD_THRESHOLD) {
388 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
389 sta->addr, tid);
390 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
391 if (ret == -EAGAIN) {
392 /*
393 * driver and mac80211 is out of sync
394 * this might be cause by reloading firmware
395 * stop the tx ba session here
396 */
397 IWL_ERR(priv, "Fail start Tx agg on tid: %d\n",
398 tid);
399 ieee80211_stop_tx_ba_session(sta, tid);
400 }
401 } else {
402 IWL_ERR(priv, "Aggregation not enabled for tid %d "
403 "because load = %u\n", tid, load);
404 }
405 return ret;
406 }
407
408 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
409 struct iwl_lq_sta *lq_data,
410 struct ieee80211_sta *sta)
411 {
412 if (tid < TID_MAX_LOAD_COUNT)
413 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
414 else
415 IWL_ERR(priv, "tid exceeds max load count: %d/%d\n",
416 tid, TID_MAX_LOAD_COUNT);
417 }
418
419 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
420 {
421 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
422 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
423 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
424 }
425
426 /*
427 * Static function to get the expected throughput from an iwl_scale_tbl_info
428 * that wraps a NULL pointer check
429 */
430 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
431 {
432 if (tbl->expected_tpt)
433 return tbl->expected_tpt[rs_index];
434 return 0;
435 }
436
437 /**
438 * rs_collect_tx_data - Update the success/failure sliding window
439 *
440 * We keep a sliding window of the last 62 packets transmitted
441 * at this rate. window->data contains the bitmask of successful
442 * packets.
443 */
444 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
445 int scale_index, int attempts, int successes)
446 {
447 struct iwl_rate_scale_data *window = NULL;
448 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
449 s32 fail_count, tpt;
450
451 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
452 return -EINVAL;
453
454 /* Select window for current tx bit rate */
455 window = &(tbl->win[scale_index]);
456
457 /* Get expected throughput */
458 tpt = get_expected_tpt(tbl, scale_index);
459
460 /*
461 * Keep track of only the latest 62 tx frame attempts in this rate's
462 * history window; anything older isn't really relevant any more.
463 * If we have filled up the sliding window, drop the oldest attempt;
464 * if the oldest attempt (highest bit in bitmap) shows "success",
465 * subtract "1" from the success counter (this is the main reason
466 * we keep these bitmaps!).
467 */
468 while (attempts > 0) {
469 if (window->counter >= IWL_RATE_MAX_WINDOW) {
470
471 /* remove earliest */
472 window->counter = IWL_RATE_MAX_WINDOW - 1;
473
474 if (window->data & mask) {
475 window->data &= ~mask;
476 window->success_counter--;
477 }
478 }
479
480 /* Increment frames-attempted counter */
481 window->counter++;
482
483 /* Shift bitmap by one frame to throw away oldest history */
484 window->data <<= 1;
485
486 /* Mark the most recent #successes attempts as successful */
487 if (successes > 0) {
488 window->success_counter++;
489 window->data |= 0x1;
490 successes--;
491 }
492
493 attempts--;
494 }
495
496 /* Calculate current success ratio, avoid divide-by-0! */
497 if (window->counter > 0)
498 window->success_ratio = 128 * (100 * window->success_counter)
499 / window->counter;
500 else
501 window->success_ratio = IWL_INVALID_VALUE;
502
503 fail_count = window->counter - window->success_counter;
504
505 /* Calculate average throughput, if we have enough history. */
506 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
507 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
508 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
509 else
510 window->average_tpt = IWL_INVALID_VALUE;
511
512 /* Tag this window as having been updated */
513 window->stamp = jiffies;
514
515 return 0;
516 }
517
518 /*
519 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
520 */
521 /* FIXME:RS:remove this function and put the flags statically in the table */
522 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
523 struct iwl_scale_tbl_info *tbl,
524 int index, u8 use_green)
525 {
526 u32 rate_n_flags = 0;
527
528 if (is_legacy(tbl->lq_type)) {
529 rate_n_flags = iwl_rates[index].plcp;
530 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
531 rate_n_flags |= RATE_MCS_CCK_MSK;
532
533 } else if (is_Ht(tbl->lq_type)) {
534 if (index > IWL_LAST_OFDM_RATE) {
535 IWL_ERR(priv, "Invalid HT rate index %d\n", index);
536 index = IWL_LAST_OFDM_RATE;
537 }
538 rate_n_flags = RATE_MCS_HT_MSK;
539
540 if (is_siso(tbl->lq_type))
541 rate_n_flags |= iwl_rates[index].plcp_siso;
542 else if (is_mimo2(tbl->lq_type))
543 rate_n_flags |= iwl_rates[index].plcp_mimo2;
544 else
545 rate_n_flags |= iwl_rates[index].plcp_mimo3;
546 } else {
547 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
548 }
549
550 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
551 RATE_MCS_ANT_ABC_MSK);
552
553 if (is_Ht(tbl->lq_type)) {
554 if (tbl->is_ht40) {
555 if (tbl->is_dup)
556 rate_n_flags |= RATE_MCS_DUP_MSK;
557 else
558 rate_n_flags |= RATE_MCS_HT40_MSK;
559 }
560 if (tbl->is_SGI)
561 rate_n_flags |= RATE_MCS_SGI_MSK;
562
563 if (use_green) {
564 rate_n_flags |= RATE_MCS_GF_MSK;
565 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
566 rate_n_flags &= ~RATE_MCS_SGI_MSK;
567 IWL_ERR(priv, "GF was set with SGI:SISO\n");
568 }
569 }
570 }
571 return rate_n_flags;
572 }
573
574 /*
575 * Interpret uCode API's rate_n_flags format,
576 * fill "search" or "active" tx mode table.
577 */
578 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
579 enum ieee80211_band band,
580 struct iwl_scale_tbl_info *tbl,
581 int *rate_idx)
582 {
583 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
584 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
585 u8 mcs;
586
587 memset(tbl, 0, sizeof(struct iwl_scale_tbl_info));
588 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
589
590 if (*rate_idx == IWL_RATE_INVALID) {
591 *rate_idx = -1;
592 return -EINVAL;
593 }
594 tbl->is_SGI = 0; /* default legacy setup */
595 tbl->is_ht40 = 0;
596 tbl->is_dup = 0;
597 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
598 tbl->lq_type = LQ_NONE;
599 tbl->max_search = IWL_MAX_SEARCH;
600
601 /* legacy rate format */
602 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
603 if (num_of_ant == 1) {
604 if (band == IEEE80211_BAND_5GHZ)
605 tbl->lq_type = LQ_A;
606 else
607 tbl->lq_type = LQ_G;
608 }
609 /* HT rate format */
610 } else {
611 if (rate_n_flags & RATE_MCS_SGI_MSK)
612 tbl->is_SGI = 1;
613
614 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
615 (rate_n_flags & RATE_MCS_DUP_MSK))
616 tbl->is_ht40 = 1;
617
618 if (rate_n_flags & RATE_MCS_DUP_MSK)
619 tbl->is_dup = 1;
620
621 mcs = rs_extract_rate(rate_n_flags);
622
623 /* SISO */
624 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
625 if (num_of_ant == 1)
626 tbl->lq_type = LQ_SISO; /*else NONE*/
627 /* MIMO2 */
628 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
629 if (num_of_ant == 2)
630 tbl->lq_type = LQ_MIMO2;
631 /* MIMO3 */
632 } else {
633 if (num_of_ant == 3) {
634 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
635 tbl->lq_type = LQ_MIMO3;
636 }
637 }
638 }
639 return 0;
640 }
641
642 /* switch to another antenna/antennas and return 1 */
643 /* if no other valid antenna found, return 0 */
644 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
645 struct iwl_scale_tbl_info *tbl)
646 {
647 u8 new_ant_type;
648
649 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
650 return 0;
651
652 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
653 return 0;
654
655 new_ant_type = ant_toggle_lookup[tbl->ant_type];
656
657 while ((new_ant_type != tbl->ant_type) &&
658 !rs_is_valid_ant(valid_ant, new_ant_type))
659 new_ant_type = ant_toggle_lookup[new_ant_type];
660
661 if (new_ant_type == tbl->ant_type)
662 return 0;
663
664 tbl->ant_type = new_ant_type;
665 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
666 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
667 return 1;
668 }
669
670 /**
671 * Green-field mode is valid if the station supports it and
672 * there are no non-GF stations present in the BSS.
673 */
674 static bool rs_use_green(struct ieee80211_sta *sta)
675 {
676 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
677 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
678
679 return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
680 !(ctx->ht.non_gf_sta_present);
681 }
682
683 /**
684 * rs_get_supported_rates - get the available rates
685 *
686 * if management frame or broadcast frame only return
687 * basic available rates.
688 *
689 */
690 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
691 struct ieee80211_hdr *hdr,
692 enum iwl_table_type rate_type)
693 {
694 if (is_legacy(rate_type)) {
695 return lq_sta->active_legacy_rate;
696 } else {
697 if (is_siso(rate_type))
698 return lq_sta->active_siso_rate;
699 else if (is_mimo2(rate_type))
700 return lq_sta->active_mimo2_rate;
701 else
702 return lq_sta->active_mimo3_rate;
703 }
704 }
705
706 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
707 int rate_type)
708 {
709 u8 high = IWL_RATE_INVALID;
710 u8 low = IWL_RATE_INVALID;
711
712 /* 802.11A or ht walks to the next literal adjacent rate in
713 * the rate table */
714 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
715 int i;
716 u32 mask;
717
718 /* Find the previous rate that is in the rate mask */
719 i = index - 1;
720 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
721 if (rate_mask & mask) {
722 low = i;
723 break;
724 }
725 }
726
727 /* Find the next rate that is in the rate mask */
728 i = index + 1;
729 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
730 if (rate_mask & mask) {
731 high = i;
732 break;
733 }
734 }
735
736 return (high << 8) | low;
737 }
738
739 low = index;
740 while (low != IWL_RATE_INVALID) {
741 low = iwl_rates[low].prev_rs;
742 if (low == IWL_RATE_INVALID)
743 break;
744 if (rate_mask & (1 << low))
745 break;
746 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
747 }
748
749 high = index;
750 while (high != IWL_RATE_INVALID) {
751 high = iwl_rates[high].next_rs;
752 if (high == IWL_RATE_INVALID)
753 break;
754 if (rate_mask & (1 << high))
755 break;
756 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
757 }
758
759 return (high << 8) | low;
760 }
761
762 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
763 struct iwl_scale_tbl_info *tbl,
764 u8 scale_index, u8 ht_possible)
765 {
766 s32 low;
767 u16 rate_mask;
768 u16 high_low;
769 u8 switch_to_legacy = 0;
770 u8 is_green = lq_sta->is_green;
771 struct iwl_priv *priv = lq_sta->drv;
772
773 /* check if we need to switch from HT to legacy rates.
774 * assumption is that mandatory rates (1Mbps or 6Mbps)
775 * are always supported (spec demand) */
776 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
777 switch_to_legacy = 1;
778 scale_index = rs_ht_to_legacy[scale_index];
779 if (lq_sta->band == IEEE80211_BAND_5GHZ)
780 tbl->lq_type = LQ_A;
781 else
782 tbl->lq_type = LQ_G;
783
784 if (num_of_ant(tbl->ant_type) > 1)
785 tbl->ant_type =
786 first_antenna(priv->hw_params.valid_tx_ant);
787
788 tbl->is_ht40 = 0;
789 tbl->is_SGI = 0;
790 tbl->max_search = IWL_MAX_SEARCH;
791 }
792
793 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
794
795 /* Mask with station rate restriction */
796 if (is_legacy(tbl->lq_type)) {
797 /* supp_rates has no CCK bits in A mode */
798 if (lq_sta->band == IEEE80211_BAND_5GHZ)
799 rate_mask = (u16)(rate_mask &
800 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
801 else
802 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
803 }
804
805 /* If we switched from HT to legacy, check current rate */
806 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
807 low = scale_index;
808 goto out;
809 }
810
811 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
812 tbl->lq_type);
813 low = high_low & 0xff;
814
815 if (low == IWL_RATE_INVALID)
816 low = scale_index;
817
818 out:
819 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
820 }
821
822 /*
823 * Simple function to compare two rate scale table types
824 */
825 static bool table_type_matches(struct iwl_scale_tbl_info *a,
826 struct iwl_scale_tbl_info *b)
827 {
828 return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
829 (a->is_SGI == b->is_SGI);
830 }
831
832 static void rs_bt_update_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
833 struct iwl_lq_sta *lq_sta)
834 {
835 struct iwl_scale_tbl_info *tbl;
836 bool full_concurrent = priv->bt_full_concurrent;
837 unsigned long flags;
838
839 if (priv->bt_ant_couple_ok) {
840 /*
841 * Is there a need to switch between
842 * full concurrency and 3-wire?
843 */
844 spin_lock_irqsave(&priv->lock, flags);
845 if (priv->bt_ci_compliance && priv->bt_ant_couple_ok)
846 full_concurrent = true;
847 else
848 full_concurrent = false;
849 spin_unlock_irqrestore(&priv->lock, flags);
850 }
851 if ((priv->bt_traffic_load != priv->last_bt_traffic_load) ||
852 (priv->bt_full_concurrent != full_concurrent)) {
853 priv->bt_full_concurrent = full_concurrent;
854
855 /* Update uCode's rate table. */
856 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
857 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
858 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
859
860 queue_work(priv->workqueue, &priv->bt_full_concurrency);
861 }
862 }
863
864 /*
865 * mac80211 sends us Tx status
866 */
867 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
868 struct ieee80211_sta *sta, void *priv_sta,
869 struct sk_buff *skb)
870 {
871 int legacy_success;
872 int retries;
873 int rs_index, mac_index, i;
874 struct iwl_lq_sta *lq_sta = priv_sta;
875 struct iwl_link_quality_cmd *table;
876 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
877 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
878 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
879 enum mac80211_rate_control_flags mac_flags;
880 u32 tx_rate;
881 struct iwl_scale_tbl_info tbl_type;
882 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
883 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
884 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
885
886 IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
887
888 /* Treat uninitialized rate scaling data same as non-existing. */
889 if (!lq_sta) {
890 IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n");
891 return;
892 } else if (!lq_sta->drv) {
893 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
894 return;
895 }
896
897 if (!ieee80211_is_data(hdr->frame_control) ||
898 info->flags & IEEE80211_TX_CTL_NO_ACK)
899 return;
900
901 /* This packet was aggregated but doesn't carry status info */
902 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
903 !(info->flags & IEEE80211_TX_STAT_AMPDU))
904 return;
905
906 /*
907 * Ignore this Tx frame response if its initial rate doesn't match
908 * that of latest Link Quality command. There may be stragglers
909 * from a previous Link Quality command, but we're no longer interested
910 * in those; they're either from the "active" mode while we're trying
911 * to check "search" mode, or a prior "search" mode after we've moved
912 * to a new "search" mode (which might become the new "active" mode).
913 */
914 table = &lq_sta->lq;
915 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
916 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
917 if (priv->band == IEEE80211_BAND_5GHZ)
918 rs_index -= IWL_FIRST_OFDM_RATE;
919 mac_flags = info->status.rates[0].flags;
920 mac_index = info->status.rates[0].idx;
921 /* For HT packets, map MCS to PLCP */
922 if (mac_flags & IEEE80211_TX_RC_MCS) {
923 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
924 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
925 mac_index++;
926 /*
927 * mac80211 HT index is always zero-indexed; we need to move
928 * HT OFDM rates after CCK rates in 2.4 GHz band
929 */
930 if (priv->band == IEEE80211_BAND_2GHZ)
931 mac_index += IWL_FIRST_OFDM_RATE;
932 }
933 /* Here we actually compare this rate to the latest LQ command */
934 if ((mac_index < 0) ||
935 (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
936 (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
937 (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
938 (tbl_type.ant_type != info->antenna_sel_tx) ||
939 (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
940 (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
941 (rs_index != mac_index)) {
942 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate);
943 /*
944 * Since rates mis-match, the last LQ command may have failed.
945 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
946 * ... driver.
947 */
948 lq_sta->missed_rate_counter++;
949 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
950 lq_sta->missed_rate_counter = 0;
951 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
952 }
953 /* Regardless, ignore this status info for outdated rate */
954 return;
955 } else
956 /* Rate did match, so reset the missed_rate_counter */
957 lq_sta->missed_rate_counter = 0;
958
959 /* Figure out if rate scale algorithm is in active or search table */
960 if (table_type_matches(&tbl_type,
961 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
962 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
963 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
964 } else if (table_type_matches(&tbl_type,
965 &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
966 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
967 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
968 } else {
969 IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n");
970 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
971 IWL_DEBUG_RATE(priv, "active- lq:%x, ant:%x, SGI:%d\n",
972 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
973 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
974 IWL_DEBUG_RATE(priv, "search- lq:%x, ant:%x, SGI:%d\n",
975 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
976 IWL_DEBUG_RATE(priv, "actual- lq:%x, ant:%x, SGI:%d\n",
977 tbl_type.lq_type, tbl_type.ant_type, tbl_type.is_SGI);
978 /*
979 * no matching table found, let's by-pass the data collection
980 * and continue to perform rate scale to find the rate table
981 */
982 rs_stay_in_table(lq_sta, true);
983 goto done;
984 }
985
986 /*
987 * Updating the frame history depends on whether packets were
988 * aggregated.
989 *
990 * For aggregation, all packets were transmitted at the same rate, the
991 * first index into rate scale table.
992 */
993 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
994 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
995 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
996 &rs_index);
997 rs_collect_tx_data(curr_tbl, rs_index,
998 info->status.ampdu_len,
999 info->status.ampdu_ack_len);
1000
1001 /* Update success/fail counts if not searching for new mode */
1002 if (lq_sta->stay_in_tbl) {
1003 lq_sta->total_success += info->status.ampdu_ack_len;
1004 lq_sta->total_failed += (info->status.ampdu_len -
1005 info->status.ampdu_ack_len);
1006 }
1007 } else {
1008 /*
1009 * For legacy, update frame history with for each Tx retry.
1010 */
1011 retries = info->status.rates[0].count - 1;
1012 /* HW doesn't send more than 15 retries */
1013 retries = min(retries, 15);
1014
1015 /* The last transmission may have been successful */
1016 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1017 /* Collect data for each rate used during failed TX attempts */
1018 for (i = 0; i <= retries; ++i) {
1019 tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
1020 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
1021 &tbl_type, &rs_index);
1022 /*
1023 * Only collect stats if retried rate is in the same RS
1024 * table as active/search.
1025 */
1026 if (table_type_matches(&tbl_type, curr_tbl))
1027 tmp_tbl = curr_tbl;
1028 else if (table_type_matches(&tbl_type, other_tbl))
1029 tmp_tbl = other_tbl;
1030 else
1031 continue;
1032 rs_collect_tx_data(tmp_tbl, rs_index, 1,
1033 i < retries ? 0 : legacy_success);
1034 }
1035
1036 /* Update success/fail counts if not searching for new mode */
1037 if (lq_sta->stay_in_tbl) {
1038 lq_sta->total_success += legacy_success;
1039 lq_sta->total_failed += retries + (1 - legacy_success);
1040 }
1041 }
1042 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1043 lq_sta->last_rate_n_flags = tx_rate;
1044 done:
1045 /* See if there's a better rate or modulation mode to try. */
1046 if (sta && sta->supp_rates[sband->band])
1047 rs_rate_scale_perform(priv, skb, sta, lq_sta);
1048
1049 if (priv->cfg->bt_params && priv->cfg->bt_params->advanced_bt_coexist)
1050 rs_bt_update_lq(priv, ctx, lq_sta);
1051 }
1052
1053 /*
1054 * Begin a period of staying with a selected modulation mode.
1055 * Set "stay_in_tbl" flag to prevent any mode switches.
1056 * Set frame tx success limits according to legacy vs. high-throughput,
1057 * and reset overall (spanning all rates) tx success history statistics.
1058 * These control how long we stay using same modulation mode before
1059 * searching for a new mode.
1060 */
1061 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
1062 struct iwl_lq_sta *lq_sta)
1063 {
1064 IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
1065 lq_sta->stay_in_tbl = 1; /* only place this gets set */
1066 if (is_legacy) {
1067 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1068 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1069 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1070 } else {
1071 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1072 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1073 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1074 }
1075 lq_sta->table_count = 0;
1076 lq_sta->total_failed = 0;
1077 lq_sta->total_success = 0;
1078 lq_sta->flush_timer = jiffies;
1079 lq_sta->action_counter = 0;
1080 }
1081
1082 /*
1083 * Find correct throughput table for given mode of modulation
1084 */
1085 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1086 struct iwl_scale_tbl_info *tbl)
1087 {
1088 /* Used to choose among HT tables */
1089 s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1090
1091 /* Check for invalid LQ type */
1092 if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1093 tbl->expected_tpt = expected_tpt_legacy;
1094 return;
1095 }
1096
1097 /* Legacy rates have only one table */
1098 if (is_legacy(tbl->lq_type)) {
1099 tbl->expected_tpt = expected_tpt_legacy;
1100 return;
1101 }
1102
1103 /* Choose among many HT tables depending on number of streams
1104 * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
1105 * status */
1106 if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1107 ht_tbl_pointer = expected_tpt_siso20MHz;
1108 else if (is_siso(tbl->lq_type))
1109 ht_tbl_pointer = expected_tpt_siso40MHz;
1110 else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1111 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1112 else if (is_mimo2(tbl->lq_type))
1113 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1114 else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1115 ht_tbl_pointer = expected_tpt_mimo3_20MHz;
1116 else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
1117 ht_tbl_pointer = expected_tpt_mimo3_40MHz;
1118
1119 if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */
1120 tbl->expected_tpt = ht_tbl_pointer[0];
1121 else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */
1122 tbl->expected_tpt = ht_tbl_pointer[1];
1123 else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */
1124 tbl->expected_tpt = ht_tbl_pointer[2];
1125 else /* AGG+SGI */
1126 tbl->expected_tpt = ht_tbl_pointer[3];
1127 }
1128
1129 /*
1130 * Find starting rate for new "search" high-throughput mode of modulation.
1131 * Goal is to find lowest expected rate (under perfect conditions) that is
1132 * above the current measured throughput of "active" mode, to give new mode
1133 * a fair chance to prove itself without too many challenges.
1134 *
1135 * This gets called when transitioning to more aggressive modulation
1136 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1137 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1138 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1139 * bit rate will typically need to increase, but not if performance was bad.
1140 */
1141 static s32 rs_get_best_rate(struct iwl_priv *priv,
1142 struct iwl_lq_sta *lq_sta,
1143 struct iwl_scale_tbl_info *tbl, /* "search" */
1144 u16 rate_mask, s8 index)
1145 {
1146 /* "active" values */
1147 struct iwl_scale_tbl_info *active_tbl =
1148 &(lq_sta->lq_info[lq_sta->active_tbl]);
1149 s32 active_sr = active_tbl->win[index].success_ratio;
1150 s32 active_tpt = active_tbl->expected_tpt[index];
1151
1152 /* expected "search" throughput */
1153 s32 *tpt_tbl = tbl->expected_tpt;
1154
1155 s32 new_rate, high, low, start_hi;
1156 u16 high_low;
1157 s8 rate = index;
1158
1159 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1160
1161 for (; ;) {
1162 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1163 tbl->lq_type);
1164
1165 low = high_low & 0xff;
1166 high = (high_low >> 8) & 0xff;
1167
1168 /*
1169 * Lower the "search" bit rate, to give new "search" mode
1170 * approximately the same throughput as "active" if:
1171 *
1172 * 1) "Active" mode has been working modestly well (but not
1173 * great), and expected "search" throughput (under perfect
1174 * conditions) at candidate rate is above the actual
1175 * measured "active" throughput (but less than expected
1176 * "active" throughput under perfect conditions).
1177 * OR
1178 * 2) "Active" mode has been working perfectly or very well
1179 * and expected "search" throughput (under perfect
1180 * conditions) at candidate rate is above expected
1181 * "active" throughput (under perfect conditions).
1182 */
1183 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1184 ((active_sr > IWL_RATE_DECREASE_TH) &&
1185 (active_sr <= IWL_RATE_HIGH_TH) &&
1186 (tpt_tbl[rate] <= active_tpt))) ||
1187 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1188 (tpt_tbl[rate] > active_tpt))) {
1189
1190 /* (2nd or later pass)
1191 * If we've already tried to raise the rate, and are
1192 * now trying to lower it, use the higher rate. */
1193 if (start_hi != IWL_RATE_INVALID) {
1194 new_rate = start_hi;
1195 break;
1196 }
1197
1198 new_rate = rate;
1199
1200 /* Loop again with lower rate */
1201 if (low != IWL_RATE_INVALID)
1202 rate = low;
1203
1204 /* Lower rate not available, use the original */
1205 else
1206 break;
1207
1208 /* Else try to raise the "search" rate to match "active" */
1209 } else {
1210 /* (2nd or later pass)
1211 * If we've already tried to lower the rate, and are
1212 * now trying to raise it, use the lower rate. */
1213 if (new_rate != IWL_RATE_INVALID)
1214 break;
1215
1216 /* Loop again with higher rate */
1217 else if (high != IWL_RATE_INVALID) {
1218 start_hi = high;
1219 rate = high;
1220
1221 /* Higher rate not available, use the original */
1222 } else {
1223 new_rate = rate;
1224 break;
1225 }
1226 }
1227 }
1228
1229 return new_rate;
1230 }
1231
1232 /*
1233 * Set up search table for MIMO2
1234 */
1235 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1236 struct iwl_lq_sta *lq_sta,
1237 struct ieee80211_conf *conf,
1238 struct ieee80211_sta *sta,
1239 struct iwl_scale_tbl_info *tbl, int index)
1240 {
1241 u16 rate_mask;
1242 s32 rate;
1243 s8 is_green = lq_sta->is_green;
1244 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1245 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1246
1247 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1248 return -1;
1249
1250 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1251 == WLAN_HT_CAP_SM_PS_STATIC)
1252 return -1;
1253
1254 /* Need both Tx chains/antennas to support MIMO */
1255 if (priv->hw_params.tx_chains_num < 2)
1256 return -1;
1257
1258 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1259
1260 tbl->lq_type = LQ_MIMO2;
1261 tbl->is_dup = lq_sta->is_dup;
1262 tbl->action = 0;
1263 tbl->max_search = IWL_MAX_SEARCH;
1264 rate_mask = lq_sta->active_mimo2_rate;
1265
1266 if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1267 tbl->is_ht40 = 1;
1268 else
1269 tbl->is_ht40 = 0;
1270
1271 rs_set_expected_tpt_table(lq_sta, tbl);
1272
1273 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1274
1275 IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1276 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1277 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1278 rate, rate_mask);
1279 return -1;
1280 }
1281 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1282
1283 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1284 tbl->current_rate, is_green);
1285 return 0;
1286 }
1287
1288 /*
1289 * Set up search table for MIMO3
1290 */
1291 static int rs_switch_to_mimo3(struct iwl_priv *priv,
1292 struct iwl_lq_sta *lq_sta,
1293 struct ieee80211_conf *conf,
1294 struct ieee80211_sta *sta,
1295 struct iwl_scale_tbl_info *tbl, int index)
1296 {
1297 u16 rate_mask;
1298 s32 rate;
1299 s8 is_green = lq_sta->is_green;
1300 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1301 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1302
1303 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1304 return -1;
1305
1306 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1307 == WLAN_HT_CAP_SM_PS_STATIC)
1308 return -1;
1309
1310 /* Need both Tx chains/antennas to support MIMO */
1311 if (priv->hw_params.tx_chains_num < 3)
1312 return -1;
1313
1314 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1315
1316 tbl->lq_type = LQ_MIMO3;
1317 tbl->is_dup = lq_sta->is_dup;
1318 tbl->action = 0;
1319 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1320 rate_mask = lq_sta->active_mimo3_rate;
1321
1322 if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1323 tbl->is_ht40 = 1;
1324 else
1325 tbl->is_ht40 = 0;
1326
1327 rs_set_expected_tpt_table(lq_sta, tbl);
1328
1329 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1330
1331 IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1332 rate, rate_mask);
1333 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1334 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1335 rate, rate_mask);
1336 return -1;
1337 }
1338 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1339
1340 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1341 tbl->current_rate, is_green);
1342 return 0;
1343 }
1344
1345 /*
1346 * Set up search table for SISO
1347 */
1348 static int rs_switch_to_siso(struct iwl_priv *priv,
1349 struct iwl_lq_sta *lq_sta,
1350 struct ieee80211_conf *conf,
1351 struct ieee80211_sta *sta,
1352 struct iwl_scale_tbl_info *tbl, int index)
1353 {
1354 u16 rate_mask;
1355 u8 is_green = lq_sta->is_green;
1356 s32 rate;
1357 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1358 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1359
1360 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1361 return -1;
1362
1363 IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1364
1365 tbl->is_dup = lq_sta->is_dup;
1366 tbl->lq_type = LQ_SISO;
1367 tbl->action = 0;
1368 tbl->max_search = IWL_MAX_SEARCH;
1369 rate_mask = lq_sta->active_siso_rate;
1370
1371 if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1372 tbl->is_ht40 = 1;
1373 else
1374 tbl->is_ht40 = 0;
1375
1376 if (is_green)
1377 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1378
1379 rs_set_expected_tpt_table(lq_sta, tbl);
1380 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1381
1382 IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1383 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1384 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1385 rate, rate_mask);
1386 return -1;
1387 }
1388 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1389 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1390 tbl->current_rate, is_green);
1391 return 0;
1392 }
1393
1394 /*
1395 * Try to switch to new modulation mode from legacy
1396 */
1397 static int rs_move_legacy_other(struct iwl_priv *priv,
1398 struct iwl_lq_sta *lq_sta,
1399 struct ieee80211_conf *conf,
1400 struct ieee80211_sta *sta,
1401 int index)
1402 {
1403 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1404 struct iwl_scale_tbl_info *search_tbl =
1405 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1406 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1407 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1408 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1409 u8 start_action;
1410 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1411 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1412 int ret = 0;
1413 u8 update_search_tbl_counter = 0;
1414
1415 switch (priv->bt_traffic_load) {
1416 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1417 /* nothing */
1418 break;
1419 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1420 /* avoid antenna B unless MIMO */
1421 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1422 if (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2)
1423 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1424 break;
1425 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1426 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1427 /* avoid antenna B and MIMO */
1428 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1429 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2 &&
1430 tbl->action != IWL_LEGACY_SWITCH_SISO)
1431 tbl->action = IWL_LEGACY_SWITCH_SISO;
1432 break;
1433 default:
1434 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1435 break;
1436 }
1437
1438 if (!iwl_ht_enabled(priv))
1439 /* stay in Legacy */
1440 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1441 else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1442 tbl->action > IWL_LEGACY_SWITCH_SISO)
1443 tbl->action = IWL_LEGACY_SWITCH_SISO;
1444
1445 /* configure as 1x1 if bt full concurrency */
1446 if (priv->bt_full_concurrent) {
1447 if (!iwl_ht_enabled(priv))
1448 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1449 else if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1450 tbl->action = IWL_LEGACY_SWITCH_SISO;
1451 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1452 }
1453
1454 start_action = tbl->action;
1455 for (; ;) {
1456 lq_sta->action_counter++;
1457 switch (tbl->action) {
1458 case IWL_LEGACY_SWITCH_ANTENNA1:
1459 case IWL_LEGACY_SWITCH_ANTENNA2:
1460 IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1461
1462 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1463 tx_chains_num <= 1) ||
1464 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1465 tx_chains_num <= 2))
1466 break;
1467
1468 /* Don't change antenna if success has been great */
1469 if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1470 !priv->bt_full_concurrent &&
1471 priv->bt_traffic_load ==
1472 IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1473 break;
1474
1475 /* Set up search table to try other antenna */
1476 memcpy(search_tbl, tbl, sz);
1477
1478 if (rs_toggle_antenna(valid_tx_ant,
1479 &search_tbl->current_rate, search_tbl)) {
1480 update_search_tbl_counter = 1;
1481 rs_set_expected_tpt_table(lq_sta, search_tbl);
1482 goto out;
1483 }
1484 break;
1485 case IWL_LEGACY_SWITCH_SISO:
1486 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1487
1488 /* Set up search table to try SISO */
1489 memcpy(search_tbl, tbl, sz);
1490 search_tbl->is_SGI = 0;
1491 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1492 search_tbl, index);
1493 if (!ret) {
1494 lq_sta->action_counter = 0;
1495 goto out;
1496 }
1497
1498 break;
1499 case IWL_LEGACY_SWITCH_MIMO2_AB:
1500 case IWL_LEGACY_SWITCH_MIMO2_AC:
1501 case IWL_LEGACY_SWITCH_MIMO2_BC:
1502 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1503
1504 /* Set up search table to try MIMO */
1505 memcpy(search_tbl, tbl, sz);
1506 search_tbl->is_SGI = 0;
1507
1508 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1509 search_tbl->ant_type = ANT_AB;
1510 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1511 search_tbl->ant_type = ANT_AC;
1512 else
1513 search_tbl->ant_type = ANT_BC;
1514
1515 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1516 break;
1517
1518 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1519 search_tbl, index);
1520 if (!ret) {
1521 lq_sta->action_counter = 0;
1522 goto out;
1523 }
1524 break;
1525
1526 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1527 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1528
1529 /* Set up search table to try MIMO3 */
1530 memcpy(search_tbl, tbl, sz);
1531 search_tbl->is_SGI = 0;
1532
1533 search_tbl->ant_type = ANT_ABC;
1534
1535 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1536 break;
1537
1538 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1539 search_tbl, index);
1540 if (!ret) {
1541 lq_sta->action_counter = 0;
1542 goto out;
1543 }
1544 break;
1545 }
1546 tbl->action++;
1547 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1548 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1549
1550 if (tbl->action == start_action)
1551 break;
1552
1553 }
1554 search_tbl->lq_type = LQ_NONE;
1555 return 0;
1556
1557 out:
1558 lq_sta->search_better_tbl = 1;
1559 tbl->action++;
1560 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1561 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1562 if (update_search_tbl_counter)
1563 search_tbl->action = tbl->action;
1564 return 0;
1565
1566 }
1567
1568 /*
1569 * Try to switch to new modulation mode from SISO
1570 */
1571 static int rs_move_siso_to_other(struct iwl_priv *priv,
1572 struct iwl_lq_sta *lq_sta,
1573 struct ieee80211_conf *conf,
1574 struct ieee80211_sta *sta, int index)
1575 {
1576 u8 is_green = lq_sta->is_green;
1577 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1578 struct iwl_scale_tbl_info *search_tbl =
1579 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1580 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1581 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1582 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1583 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1584 u8 start_action;
1585 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1586 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1587 u8 update_search_tbl_counter = 0;
1588 int ret;
1589
1590 switch (priv->bt_traffic_load) {
1591 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1592 /* nothing */
1593 break;
1594 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1595 /* avoid antenna B unless MIMO */
1596 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1597 if (tbl->action == IWL_SISO_SWITCH_ANTENNA2)
1598 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1599 break;
1600 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1601 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1602 /* avoid antenna B and MIMO */
1603 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1604 if (tbl->action != IWL_SISO_SWITCH_ANTENNA1)
1605 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1606 break;
1607 default:
1608 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1609 break;
1610 }
1611
1612 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1613 tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1614 /* stay in SISO */
1615 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1616 }
1617
1618 /* configure as 1x1 if bt full concurrency */
1619 if (priv->bt_full_concurrent) {
1620 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1621 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1622 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1623 }
1624
1625 start_action = tbl->action;
1626 for (;;) {
1627 lq_sta->action_counter++;
1628 switch (tbl->action) {
1629 case IWL_SISO_SWITCH_ANTENNA1:
1630 case IWL_SISO_SWITCH_ANTENNA2:
1631 IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1632 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1633 tx_chains_num <= 1) ||
1634 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1635 tx_chains_num <= 2))
1636 break;
1637
1638 if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1639 !priv->bt_full_concurrent &&
1640 priv->bt_traffic_load ==
1641 IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1642 break;
1643
1644 memcpy(search_tbl, tbl, sz);
1645 if (rs_toggle_antenna(valid_tx_ant,
1646 &search_tbl->current_rate, search_tbl)) {
1647 update_search_tbl_counter = 1;
1648 goto out;
1649 }
1650 break;
1651 case IWL_SISO_SWITCH_MIMO2_AB:
1652 case IWL_SISO_SWITCH_MIMO2_AC:
1653 case IWL_SISO_SWITCH_MIMO2_BC:
1654 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1655 memcpy(search_tbl, tbl, sz);
1656 search_tbl->is_SGI = 0;
1657
1658 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1659 search_tbl->ant_type = ANT_AB;
1660 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1661 search_tbl->ant_type = ANT_AC;
1662 else
1663 search_tbl->ant_type = ANT_BC;
1664
1665 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1666 break;
1667
1668 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1669 search_tbl, index);
1670 if (!ret)
1671 goto out;
1672 break;
1673 case IWL_SISO_SWITCH_GI:
1674 if (!tbl->is_ht40 && !(ht_cap->cap &
1675 IEEE80211_HT_CAP_SGI_20))
1676 break;
1677 if (tbl->is_ht40 && !(ht_cap->cap &
1678 IEEE80211_HT_CAP_SGI_40))
1679 break;
1680
1681 IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1682
1683 memcpy(search_tbl, tbl, sz);
1684 if (is_green) {
1685 if (!tbl->is_SGI)
1686 break;
1687 else
1688 IWL_ERR(priv,
1689 "SGI was set in GF+SISO\n");
1690 }
1691 search_tbl->is_SGI = !tbl->is_SGI;
1692 rs_set_expected_tpt_table(lq_sta, search_tbl);
1693 if (tbl->is_SGI) {
1694 s32 tpt = lq_sta->last_tpt / 100;
1695 if (tpt >= search_tbl->expected_tpt[index])
1696 break;
1697 }
1698 search_tbl->current_rate =
1699 rate_n_flags_from_tbl(priv, search_tbl,
1700 index, is_green);
1701 update_search_tbl_counter = 1;
1702 goto out;
1703 case IWL_SISO_SWITCH_MIMO3_ABC:
1704 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1705 memcpy(search_tbl, tbl, sz);
1706 search_tbl->is_SGI = 0;
1707 search_tbl->ant_type = ANT_ABC;
1708
1709 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1710 break;
1711
1712 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1713 search_tbl, index);
1714 if (!ret)
1715 goto out;
1716 break;
1717 }
1718 tbl->action++;
1719 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1720 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1721
1722 if (tbl->action == start_action)
1723 break;
1724 }
1725 search_tbl->lq_type = LQ_NONE;
1726 return 0;
1727
1728 out:
1729 lq_sta->search_better_tbl = 1;
1730 tbl->action++;
1731 if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1732 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1733 if (update_search_tbl_counter)
1734 search_tbl->action = tbl->action;
1735
1736 return 0;
1737 }
1738
1739 /*
1740 * Try to switch to new modulation mode from MIMO2
1741 */
1742 static int rs_move_mimo2_to_other(struct iwl_priv *priv,
1743 struct iwl_lq_sta *lq_sta,
1744 struct ieee80211_conf *conf,
1745 struct ieee80211_sta *sta, int index)
1746 {
1747 s8 is_green = lq_sta->is_green;
1748 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1749 struct iwl_scale_tbl_info *search_tbl =
1750 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1751 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1752 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1753 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1754 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1755 u8 start_action;
1756 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1757 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1758 u8 update_search_tbl_counter = 0;
1759 int ret;
1760
1761 switch (priv->bt_traffic_load) {
1762 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1763 /* nothing */
1764 break;
1765 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1766 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1767 /* avoid antenna B and MIMO */
1768 if (tbl->action != IWL_MIMO2_SWITCH_SISO_A)
1769 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1770 break;
1771 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1772 /* avoid antenna B unless MIMO */
1773 if (tbl->action == IWL_MIMO2_SWITCH_SISO_B ||
1774 tbl->action == IWL_MIMO2_SWITCH_SISO_C)
1775 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1776 break;
1777 default:
1778 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1779 break;
1780 }
1781
1782 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1783 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1784 tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1785 /* switch in SISO */
1786 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1787 }
1788
1789 /* configure as 1x1 if bt full concurrency */
1790 if (priv->bt_full_concurrent &&
1791 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1792 tbl->action > IWL_MIMO2_SWITCH_SISO_C))
1793 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1794
1795 start_action = tbl->action;
1796 for (;;) {
1797 lq_sta->action_counter++;
1798 switch (tbl->action) {
1799 case IWL_MIMO2_SWITCH_ANTENNA1:
1800 case IWL_MIMO2_SWITCH_ANTENNA2:
1801 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1802
1803 if (tx_chains_num <= 2)
1804 break;
1805
1806 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1807 break;
1808
1809 memcpy(search_tbl, tbl, sz);
1810 if (rs_toggle_antenna(valid_tx_ant,
1811 &search_tbl->current_rate, search_tbl)) {
1812 update_search_tbl_counter = 1;
1813 goto out;
1814 }
1815 break;
1816 case IWL_MIMO2_SWITCH_SISO_A:
1817 case IWL_MIMO2_SWITCH_SISO_B:
1818 case IWL_MIMO2_SWITCH_SISO_C:
1819 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1820
1821 /* Set up new search table for SISO */
1822 memcpy(search_tbl, tbl, sz);
1823
1824 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1825 search_tbl->ant_type = ANT_A;
1826 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1827 search_tbl->ant_type = ANT_B;
1828 else
1829 search_tbl->ant_type = ANT_C;
1830
1831 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1832 break;
1833
1834 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1835 search_tbl, index);
1836 if (!ret)
1837 goto out;
1838
1839 break;
1840
1841 case IWL_MIMO2_SWITCH_GI:
1842 if (!tbl->is_ht40 && !(ht_cap->cap &
1843 IEEE80211_HT_CAP_SGI_20))
1844 break;
1845 if (tbl->is_ht40 && !(ht_cap->cap &
1846 IEEE80211_HT_CAP_SGI_40))
1847 break;
1848
1849 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1850
1851 /* Set up new search table for MIMO2 */
1852 memcpy(search_tbl, tbl, sz);
1853 search_tbl->is_SGI = !tbl->is_SGI;
1854 rs_set_expected_tpt_table(lq_sta, search_tbl);
1855 /*
1856 * If active table already uses the fastest possible
1857 * modulation (dual stream with short guard interval),
1858 * and it's working well, there's no need to look
1859 * for a better type of modulation!
1860 */
1861 if (tbl->is_SGI) {
1862 s32 tpt = lq_sta->last_tpt / 100;
1863 if (tpt >= search_tbl->expected_tpt[index])
1864 break;
1865 }
1866 search_tbl->current_rate =
1867 rate_n_flags_from_tbl(priv, search_tbl,
1868 index, is_green);
1869 update_search_tbl_counter = 1;
1870 goto out;
1871
1872 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1873 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1874 memcpy(search_tbl, tbl, sz);
1875 search_tbl->is_SGI = 0;
1876 search_tbl->ant_type = ANT_ABC;
1877
1878 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1879 break;
1880
1881 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1882 search_tbl, index);
1883 if (!ret)
1884 goto out;
1885
1886 break;
1887 }
1888 tbl->action++;
1889 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1890 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1891
1892 if (tbl->action == start_action)
1893 break;
1894 }
1895 search_tbl->lq_type = LQ_NONE;
1896 return 0;
1897 out:
1898 lq_sta->search_better_tbl = 1;
1899 tbl->action++;
1900 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1901 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1902 if (update_search_tbl_counter)
1903 search_tbl->action = tbl->action;
1904
1905 return 0;
1906
1907 }
1908
1909 /*
1910 * Try to switch to new modulation mode from MIMO3
1911 */
1912 static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1913 struct iwl_lq_sta *lq_sta,
1914 struct ieee80211_conf *conf,
1915 struct ieee80211_sta *sta, int index)
1916 {
1917 s8 is_green = lq_sta->is_green;
1918 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1919 struct iwl_scale_tbl_info *search_tbl =
1920 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1921 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1922 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1923 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1924 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1925 u8 start_action;
1926 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1927 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1928 int ret;
1929 u8 update_search_tbl_counter = 0;
1930
1931 switch (priv->bt_traffic_load) {
1932 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1933 /* nothing */
1934 break;
1935 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1936 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1937 /* avoid antenna B and MIMO */
1938 if (tbl->action != IWL_MIMO3_SWITCH_SISO_A)
1939 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1940 break;
1941 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1942 /* avoid antenna B unless MIMO */
1943 if (tbl->action == IWL_MIMO3_SWITCH_SISO_B ||
1944 tbl->action == IWL_MIMO3_SWITCH_SISO_C)
1945 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1946 break;
1947 default:
1948 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1949 break;
1950 }
1951
1952 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1953 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1954 tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1955 /* switch in SISO */
1956 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1957 }
1958
1959 /* configure as 1x1 if bt full concurrency */
1960 if (priv->bt_full_concurrent &&
1961 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1962 tbl->action > IWL_MIMO3_SWITCH_SISO_C))
1963 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1964
1965 start_action = tbl->action;
1966 for (;;) {
1967 lq_sta->action_counter++;
1968 switch (tbl->action) {
1969 case IWL_MIMO3_SWITCH_ANTENNA1:
1970 case IWL_MIMO3_SWITCH_ANTENNA2:
1971 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
1972
1973 if (tx_chains_num <= 3)
1974 break;
1975
1976 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1977 break;
1978
1979 memcpy(search_tbl, tbl, sz);
1980 if (rs_toggle_antenna(valid_tx_ant,
1981 &search_tbl->current_rate, search_tbl))
1982 goto out;
1983 break;
1984 case IWL_MIMO3_SWITCH_SISO_A:
1985 case IWL_MIMO3_SWITCH_SISO_B:
1986 case IWL_MIMO3_SWITCH_SISO_C:
1987 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
1988
1989 /* Set up new search table for SISO */
1990 memcpy(search_tbl, tbl, sz);
1991
1992 if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
1993 search_tbl->ant_type = ANT_A;
1994 else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
1995 search_tbl->ant_type = ANT_B;
1996 else
1997 search_tbl->ant_type = ANT_C;
1998
1999 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2000 break;
2001
2002 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
2003 search_tbl, index);
2004 if (!ret)
2005 goto out;
2006
2007 break;
2008
2009 case IWL_MIMO3_SWITCH_MIMO2_AB:
2010 case IWL_MIMO3_SWITCH_MIMO2_AC:
2011 case IWL_MIMO3_SWITCH_MIMO2_BC:
2012 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
2013
2014 memcpy(search_tbl, tbl, sz);
2015 search_tbl->is_SGI = 0;
2016 if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
2017 search_tbl->ant_type = ANT_AB;
2018 else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
2019 search_tbl->ant_type = ANT_AC;
2020 else
2021 search_tbl->ant_type = ANT_BC;
2022
2023 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2024 break;
2025
2026 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
2027 search_tbl, index);
2028 if (!ret)
2029 goto out;
2030
2031 break;
2032
2033 case IWL_MIMO3_SWITCH_GI:
2034 if (!tbl->is_ht40 && !(ht_cap->cap &
2035 IEEE80211_HT_CAP_SGI_20))
2036 break;
2037 if (tbl->is_ht40 && !(ht_cap->cap &
2038 IEEE80211_HT_CAP_SGI_40))
2039 break;
2040
2041 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
2042
2043 /* Set up new search table for MIMO */
2044 memcpy(search_tbl, tbl, sz);
2045 search_tbl->is_SGI = !tbl->is_SGI;
2046 rs_set_expected_tpt_table(lq_sta, search_tbl);
2047 /*
2048 * If active table already uses the fastest possible
2049 * modulation (dual stream with short guard interval),
2050 * and it's working well, there's no need to look
2051 * for a better type of modulation!
2052 */
2053 if (tbl->is_SGI) {
2054 s32 tpt = lq_sta->last_tpt / 100;
2055 if (tpt >= search_tbl->expected_tpt[index])
2056 break;
2057 }
2058 search_tbl->current_rate =
2059 rate_n_flags_from_tbl(priv, search_tbl,
2060 index, is_green);
2061 update_search_tbl_counter = 1;
2062 goto out;
2063 }
2064 tbl->action++;
2065 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2066 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2067
2068 if (tbl->action == start_action)
2069 break;
2070 }
2071 search_tbl->lq_type = LQ_NONE;
2072 return 0;
2073 out:
2074 lq_sta->search_better_tbl = 1;
2075 tbl->action++;
2076 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2077 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2078 if (update_search_tbl_counter)
2079 search_tbl->action = tbl->action;
2080
2081 return 0;
2082
2083 }
2084
2085 /*
2086 * Check whether we should continue using same modulation mode, or
2087 * begin search for a new mode, based on:
2088 * 1) # tx successes or failures while using this mode
2089 * 2) # times calling this function
2090 * 3) elapsed time in this mode (not used, for now)
2091 */
2092 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
2093 {
2094 struct iwl_scale_tbl_info *tbl;
2095 int i;
2096 int active_tbl;
2097 int flush_interval_passed = 0;
2098 struct iwl_priv *priv;
2099
2100 priv = lq_sta->drv;
2101 active_tbl = lq_sta->active_tbl;
2102
2103 tbl = &(lq_sta->lq_info[active_tbl]);
2104
2105 /* If we've been disallowing search, see if we should now allow it */
2106 if (lq_sta->stay_in_tbl) {
2107
2108 /* Elapsed time using current modulation mode */
2109 if (lq_sta->flush_timer)
2110 flush_interval_passed =
2111 time_after(jiffies,
2112 (unsigned long)(lq_sta->flush_timer +
2113 IWL_RATE_SCALE_FLUSH_INTVL));
2114
2115 /*
2116 * Check if we should allow search for new modulation mode.
2117 * If many frames have failed or succeeded, or we've used
2118 * this same modulation for a long time, allow search, and
2119 * reset history stats that keep track of whether we should
2120 * allow a new search. Also (below) reset all bitmaps and
2121 * stats in active history.
2122 */
2123 if (force_search ||
2124 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
2125 (lq_sta->total_success > lq_sta->max_success_limit) ||
2126 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
2127 && (flush_interval_passed))) {
2128 IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n:",
2129 lq_sta->total_failed,
2130 lq_sta->total_success,
2131 flush_interval_passed);
2132
2133 /* Allow search for new mode */
2134 lq_sta->stay_in_tbl = 0; /* only place reset */
2135 lq_sta->total_failed = 0;
2136 lq_sta->total_success = 0;
2137 lq_sta->flush_timer = 0;
2138
2139 /*
2140 * Else if we've used this modulation mode enough repetitions
2141 * (regardless of elapsed time or success/failure), reset
2142 * history bitmaps and rate-specific stats for all rates in
2143 * active table.
2144 */
2145 } else {
2146 lq_sta->table_count++;
2147 if (lq_sta->table_count >=
2148 lq_sta->table_count_limit) {
2149 lq_sta->table_count = 0;
2150
2151 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
2152 for (i = 0; i < IWL_RATE_COUNT; i++)
2153 rs_rate_scale_clear_window(
2154 &(tbl->win[i]));
2155 }
2156 }
2157
2158 /* If transitioning to allow "search", reset all history
2159 * bitmaps and stats in active table (this will become the new
2160 * "search" table). */
2161 if (!lq_sta->stay_in_tbl) {
2162 for (i = 0; i < IWL_RATE_COUNT; i++)
2163 rs_rate_scale_clear_window(&(tbl->win[i]));
2164 }
2165 }
2166 }
2167
2168 /*
2169 * setup rate table in uCode
2170 * return rate_n_flags as used in the table
2171 */
2172 static u32 rs_update_rate_tbl(struct iwl_priv *priv,
2173 struct iwl_rxon_context *ctx,
2174 struct iwl_lq_sta *lq_sta,
2175 struct iwl_scale_tbl_info *tbl,
2176 int index, u8 is_green)
2177 {
2178 u32 rate;
2179
2180 /* Update uCode's rate table. */
2181 rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2182 rs_fill_link_cmd(priv, lq_sta, rate);
2183 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2184
2185 return rate;
2186 }
2187
2188 /*
2189 * Do rate scaling and search for new modulation mode.
2190 */
2191 static void rs_rate_scale_perform(struct iwl_priv *priv,
2192 struct sk_buff *skb,
2193 struct ieee80211_sta *sta,
2194 struct iwl_lq_sta *lq_sta)
2195 {
2196 struct ieee80211_hw *hw = priv->hw;
2197 struct ieee80211_conf *conf = &hw->conf;
2198 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2199 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2200 int low = IWL_RATE_INVALID;
2201 int high = IWL_RATE_INVALID;
2202 int index;
2203 int i;
2204 struct iwl_rate_scale_data *window = NULL;
2205 int current_tpt = IWL_INVALID_VALUE;
2206 int low_tpt = IWL_INVALID_VALUE;
2207 int high_tpt = IWL_INVALID_VALUE;
2208 u32 fail_count;
2209 s8 scale_action = 0;
2210 u16 rate_mask;
2211 u8 update_lq = 0;
2212 struct iwl_scale_tbl_info *tbl, *tbl1;
2213 u16 rate_scale_index_msk = 0;
2214 u32 rate;
2215 u8 is_green = 0;
2216 u8 active_tbl = 0;
2217 u8 done_search = 0;
2218 u16 high_low;
2219 s32 sr;
2220 u8 tid = MAX_TID_COUNT;
2221 struct iwl_tid_data *tid_data;
2222 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
2223 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
2224
2225 IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
2226
2227 /* Send management frames and NO_ACK data using lowest rate. */
2228 /* TODO: this could probably be improved.. */
2229 if (!ieee80211_is_data(hdr->frame_control) ||
2230 info->flags & IEEE80211_TX_CTL_NO_ACK)
2231 return;
2232
2233 if (!sta || !lq_sta)
2234 return;
2235
2236 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
2237
2238 tid = rs_tl_add_packet(lq_sta, hdr);
2239 if ((tid != MAX_TID_COUNT) && (lq_sta->tx_agg_tid_en & (1 << tid))) {
2240 tid_data = &priv->stations[lq_sta->lq.sta_id].tid[tid];
2241 if (tid_data->agg.state == IWL_AGG_OFF)
2242 lq_sta->is_agg = 0;
2243 else
2244 lq_sta->is_agg = 1;
2245 } else
2246 lq_sta->is_agg = 0;
2247
2248 /*
2249 * Select rate-scale / modulation-mode table to work with in
2250 * the rest of this function: "search" if searching for better
2251 * modulation mode, or "active" if doing rate scaling within a mode.
2252 */
2253 if (!lq_sta->search_better_tbl)
2254 active_tbl = lq_sta->active_tbl;
2255 else
2256 active_tbl = 1 - lq_sta->active_tbl;
2257
2258 tbl = &(lq_sta->lq_info[active_tbl]);
2259 if (is_legacy(tbl->lq_type))
2260 lq_sta->is_green = 0;
2261 else
2262 lq_sta->is_green = rs_use_green(sta);
2263 is_green = lq_sta->is_green;
2264
2265 /* current tx rate */
2266 index = lq_sta->last_txrate_idx;
2267
2268 IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2269 tbl->lq_type);
2270
2271 /* rates available for this association, and for modulation mode */
2272 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2273
2274 IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
2275
2276 /* mask with station rate restriction */
2277 if (is_legacy(tbl->lq_type)) {
2278 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2279 /* supp_rates has no CCK bits in A mode */
2280 rate_scale_index_msk = (u16) (rate_mask &
2281 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2282 else
2283 rate_scale_index_msk = (u16) (rate_mask &
2284 lq_sta->supp_rates);
2285
2286 } else
2287 rate_scale_index_msk = rate_mask;
2288
2289 if (!rate_scale_index_msk)
2290 rate_scale_index_msk = rate_mask;
2291
2292 if (!((1 << index) & rate_scale_index_msk)) {
2293 IWL_ERR(priv, "Current Rate is not valid\n");
2294 if (lq_sta->search_better_tbl) {
2295 /* revert to active table if search table is not valid*/
2296 tbl->lq_type = LQ_NONE;
2297 lq_sta->search_better_tbl = 0;
2298 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2299 /* get "active" rate info */
2300 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2301 rate = rs_update_rate_tbl(priv, ctx, lq_sta,
2302 tbl, index, is_green);
2303 }
2304 return;
2305 }
2306
2307 /* Get expected throughput table and history window for current rate */
2308 if (!tbl->expected_tpt) {
2309 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2310 return;
2311 }
2312
2313 /* force user max rate if set by user */
2314 if ((lq_sta->max_rate_idx != -1) &&
2315 (lq_sta->max_rate_idx < index)) {
2316 index = lq_sta->max_rate_idx;
2317 update_lq = 1;
2318 window = &(tbl->win[index]);
2319 goto lq_update;
2320 }
2321
2322 window = &(tbl->win[index]);
2323
2324 /*
2325 * If there is not enough history to calculate actual average
2326 * throughput, keep analyzing results of more tx frames, without
2327 * changing rate or mode (bypass most of the rest of this function).
2328 * Set up new rate table in uCode only if old rate is not supported
2329 * in current association (use new rate found above).
2330 */
2331 fail_count = window->counter - window->success_counter;
2332 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2333 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2334 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2335 "for index %d\n",
2336 window->success_counter, window->counter, index);
2337
2338 /* Can't calculate this yet; not enough history */
2339 window->average_tpt = IWL_INVALID_VALUE;
2340
2341 /* Should we stay with this modulation mode,
2342 * or search for a new one? */
2343 rs_stay_in_table(lq_sta, false);
2344
2345 goto out;
2346 }
2347 /* Else we have enough samples; calculate estimate of
2348 * actual average throughput */
2349 if (window->average_tpt != ((window->success_ratio *
2350 tbl->expected_tpt[index] + 64) / 128)) {
2351 IWL_ERR(priv, "expected_tpt should have been calculated by now\n");
2352 window->average_tpt = ((window->success_ratio *
2353 tbl->expected_tpt[index] + 64) / 128);
2354 }
2355
2356 /* If we are searching for better modulation mode, check success. */
2357 if (lq_sta->search_better_tbl &&
2358 (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
2359 /* If good success, continue using the "search" mode;
2360 * no need to send new link quality command, since we're
2361 * continuing to use the setup that we've been trying. */
2362 if (window->average_tpt > lq_sta->last_tpt) {
2363
2364 IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2365 "suc=%d cur-tpt=%d old-tpt=%d\n",
2366 window->success_ratio,
2367 window->average_tpt,
2368 lq_sta->last_tpt);
2369
2370 if (!is_legacy(tbl->lq_type))
2371 lq_sta->enable_counter = 1;
2372
2373 /* Swap tables; "search" becomes "active" */
2374 lq_sta->active_tbl = active_tbl;
2375 current_tpt = window->average_tpt;
2376
2377 /* Else poor success; go back to mode in "active" table */
2378 } else {
2379
2380 IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2381 "suc=%d cur-tpt=%d old-tpt=%d\n",
2382 window->success_ratio,
2383 window->average_tpt,
2384 lq_sta->last_tpt);
2385
2386 /* Nullify "search" table */
2387 tbl->lq_type = LQ_NONE;
2388
2389 /* Revert to "active" table */
2390 active_tbl = lq_sta->active_tbl;
2391 tbl = &(lq_sta->lq_info[active_tbl]);
2392
2393 /* Revert to "active" rate and throughput info */
2394 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2395 current_tpt = lq_sta->last_tpt;
2396
2397 /* Need to set up a new rate table in uCode */
2398 update_lq = 1;
2399 }
2400
2401 /* Either way, we've made a decision; modulation mode
2402 * search is done, allow rate adjustment next time. */
2403 lq_sta->search_better_tbl = 0;
2404 done_search = 1; /* Don't switch modes below! */
2405 goto lq_update;
2406 }
2407
2408 /* (Else) not in search of better modulation mode, try for better
2409 * starting rate, while staying in this mode. */
2410 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2411 tbl->lq_type);
2412 low = high_low & 0xff;
2413 high = (high_low >> 8) & 0xff;
2414
2415 /* If user set max rate, dont allow higher than user constrain */
2416 if ((lq_sta->max_rate_idx != -1) &&
2417 (lq_sta->max_rate_idx < high))
2418 high = IWL_RATE_INVALID;
2419
2420 sr = window->success_ratio;
2421
2422 /* Collect measured throughputs for current and adjacent rates */
2423 current_tpt = window->average_tpt;
2424 if (low != IWL_RATE_INVALID)
2425 low_tpt = tbl->win[low].average_tpt;
2426 if (high != IWL_RATE_INVALID)
2427 high_tpt = tbl->win[high].average_tpt;
2428
2429 scale_action = 0;
2430
2431 /* Too many failures, decrease rate */
2432 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2433 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2434 scale_action = -1;
2435
2436 /* No throughput measured yet for adjacent rates; try increase. */
2437 } else if ((low_tpt == IWL_INVALID_VALUE) &&
2438 (high_tpt == IWL_INVALID_VALUE)) {
2439
2440 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2441 scale_action = 1;
2442 else if (low != IWL_RATE_INVALID)
2443 scale_action = 0;
2444 }
2445
2446 /* Both adjacent throughputs are measured, but neither one has better
2447 * throughput; we're using the best rate, don't change it! */
2448 else if ((low_tpt != IWL_INVALID_VALUE) &&
2449 (high_tpt != IWL_INVALID_VALUE) &&
2450 (low_tpt < current_tpt) &&
2451 (high_tpt < current_tpt))
2452 scale_action = 0;
2453
2454 /* At least one adjacent rate's throughput is measured,
2455 * and may have better performance. */
2456 else {
2457 /* Higher adjacent rate's throughput is measured */
2458 if (high_tpt != IWL_INVALID_VALUE) {
2459 /* Higher rate has better throughput */
2460 if (high_tpt > current_tpt &&
2461 sr >= IWL_RATE_INCREASE_TH) {
2462 scale_action = 1;
2463 } else {
2464 scale_action = 0;
2465 }
2466
2467 /* Lower adjacent rate's throughput is measured */
2468 } else if (low_tpt != IWL_INVALID_VALUE) {
2469 /* Lower rate has better throughput */
2470 if (low_tpt > current_tpt) {
2471 IWL_DEBUG_RATE(priv,
2472 "decrease rate because of low tpt\n");
2473 scale_action = -1;
2474 } else if (sr >= IWL_RATE_INCREASE_TH) {
2475 scale_action = 1;
2476 }
2477 }
2478 }
2479
2480 /* Sanity check; asked for decrease, but success rate or throughput
2481 * has been good at old rate. Don't change it. */
2482 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2483 ((sr > IWL_RATE_HIGH_TH) ||
2484 (current_tpt > (100 * tbl->expected_tpt[low]))))
2485 scale_action = 0;
2486 if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2487 scale_action = -1;
2488 if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
2489 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2490 scale_action = -1;
2491
2492 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2493 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2494 if (lq_sta->last_bt_traffic > priv->bt_traffic_load) {
2495 /*
2496 * don't set scale_action, don't want to scale up if
2497 * the rate scale doesn't otherwise think that is a
2498 * good idea.
2499 */
2500 } else if (lq_sta->last_bt_traffic <= priv->bt_traffic_load) {
2501 scale_action = -1;
2502 }
2503 }
2504 lq_sta->last_bt_traffic = priv->bt_traffic_load;
2505
2506 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2507 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2508 /* search for a new modulation */
2509 rs_stay_in_table(lq_sta, true);
2510 goto lq_update;
2511 }
2512
2513 switch (scale_action) {
2514 case -1:
2515 /* Decrease starting rate, update uCode's rate table */
2516 if (low != IWL_RATE_INVALID) {
2517 update_lq = 1;
2518 index = low;
2519 }
2520
2521 break;
2522 case 1:
2523 /* Increase starting rate, update uCode's rate table */
2524 if (high != IWL_RATE_INVALID) {
2525 update_lq = 1;
2526 index = high;
2527 }
2528
2529 break;
2530 case 0:
2531 /* No change */
2532 default:
2533 break;
2534 }
2535
2536 IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2537 "high %d type %d\n",
2538 index, scale_action, low, high, tbl->lq_type);
2539
2540 lq_update:
2541 /* Replace uCode's rate table for the destination station. */
2542 if (update_lq)
2543 rate = rs_update_rate_tbl(priv, ctx, lq_sta,
2544 tbl, index, is_green);
2545
2546 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
2547 /* Should we stay with this modulation mode,
2548 * or search for a new one? */
2549 rs_stay_in_table(lq_sta, false);
2550 }
2551 /*
2552 * Search for new modulation mode if we're:
2553 * 1) Not changing rates right now
2554 * 2) Not just finishing up a search
2555 * 3) Allowing a new search
2556 */
2557 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2558 /* Save current throughput to compare with "search" throughput*/
2559 lq_sta->last_tpt = current_tpt;
2560
2561 /* Select a new "search" modulation mode to try.
2562 * If one is found, set up the new "search" table. */
2563 if (is_legacy(tbl->lq_type))
2564 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2565 else if (is_siso(tbl->lq_type))
2566 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2567 else if (is_mimo2(tbl->lq_type))
2568 rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2569 else
2570 rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2571
2572 /* If new "search" mode was selected, set up in uCode table */
2573 if (lq_sta->search_better_tbl) {
2574 /* Access the "search" table, clear its history. */
2575 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2576 for (i = 0; i < IWL_RATE_COUNT; i++)
2577 rs_rate_scale_clear_window(&(tbl->win[i]));
2578
2579 /* Use new "search" start rate */
2580 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2581
2582 IWL_DEBUG_RATE(priv, "Switch current mcs: %X index: %d\n",
2583 tbl->current_rate, index);
2584 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2585 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2586 } else
2587 done_search = 1;
2588 }
2589
2590 if (done_search && !lq_sta->stay_in_tbl) {
2591 /* If the "active" (non-search) mode was legacy,
2592 * and we've tried switching antennas,
2593 * but we haven't been able to try HT modes (not available),
2594 * stay with best antenna legacy modulation for a while
2595 * before next round of mode comparisons. */
2596 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2597 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2598 lq_sta->action_counter > tbl1->max_search) {
2599 IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2600 rs_set_stay_in_table(priv, 1, lq_sta);
2601 }
2602
2603 /* If we're in an HT mode, and all 3 mode switch actions
2604 * have been tried and compared, stay in this best modulation
2605 * mode for a while before next round of mode comparisons. */
2606 if (lq_sta->enable_counter &&
2607 (lq_sta->action_counter >= tbl1->max_search) &&
2608 iwl_ht_enabled(priv)) {
2609 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2610 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2611 (tid != MAX_TID_COUNT)) {
2612 tid_data =
2613 &priv->stations[lq_sta->lq.sta_id].tid[tid];
2614 if (tid_data->agg.state == IWL_AGG_OFF) {
2615 IWL_DEBUG_RATE(priv,
2616 "try to aggregate tid %d\n",
2617 tid);
2618 rs_tl_turn_on_agg(priv, tid,
2619 lq_sta, sta);
2620 }
2621 }
2622 rs_set_stay_in_table(priv, 0, lq_sta);
2623 }
2624 }
2625
2626 out:
2627 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2628 i = index;
2629 lq_sta->last_txrate_idx = i;
2630 }
2631
2632 /**
2633 * rs_initialize_lq - Initialize a station's hardware rate table
2634 *
2635 * The uCode's station table contains a table of fallback rates
2636 * for automatic fallback during transmission.
2637 *
2638 * NOTE: This sets up a default set of values. These will be replaced later
2639 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2640 * rc80211_simple.
2641 *
2642 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2643 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2644 * which requires station table entry to exist).
2645 */
2646 static void rs_initialize_lq(struct iwl_priv *priv,
2647 struct ieee80211_conf *conf,
2648 struct ieee80211_sta *sta,
2649 struct iwl_lq_sta *lq_sta)
2650 {
2651 struct iwl_scale_tbl_info *tbl;
2652 int rate_idx;
2653 int i;
2654 u32 rate;
2655 u8 use_green = rs_use_green(sta);
2656 u8 active_tbl = 0;
2657 u8 valid_tx_ant;
2658 struct iwl_station_priv *sta_priv;
2659 struct iwl_rxon_context *ctx;
2660
2661 if (!sta || !lq_sta)
2662 return;
2663
2664 sta_priv = (void *)sta->drv_priv;
2665 ctx = sta_priv->common.ctx;
2666
2667 i = lq_sta->last_txrate_idx;
2668
2669 valid_tx_ant = priv->hw_params.valid_tx_ant;
2670
2671 if (!lq_sta->search_better_tbl)
2672 active_tbl = lq_sta->active_tbl;
2673 else
2674 active_tbl = 1 - lq_sta->active_tbl;
2675
2676 tbl = &(lq_sta->lq_info[active_tbl]);
2677
2678 if ((i < 0) || (i >= IWL_RATE_COUNT))
2679 i = 0;
2680
2681 rate = iwl_rates[i].plcp;
2682 tbl->ant_type = first_antenna(valid_tx_ant);
2683 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2684
2685 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2686 rate |= RATE_MCS_CCK_MSK;
2687
2688 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2689 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2690 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2691
2692 rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2693 tbl->current_rate = rate;
2694 rs_set_expected_tpt_table(lq_sta, tbl);
2695 rs_fill_link_cmd(NULL, lq_sta, rate);
2696 priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2697 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_SYNC, true);
2698 }
2699
2700 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2701 struct ieee80211_tx_rate_control *txrc)
2702 {
2703
2704 struct sk_buff *skb = txrc->skb;
2705 struct ieee80211_supported_band *sband = txrc->sband;
2706 struct iwl_priv *priv __maybe_unused = (struct iwl_priv *)priv_r;
2707 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2708 struct iwl_lq_sta *lq_sta = priv_sta;
2709 int rate_idx;
2710
2711 IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2712
2713 /* Get max rate if user set max rate */
2714 if (lq_sta) {
2715 lq_sta->max_rate_idx = txrc->max_rate_idx;
2716 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2717 (lq_sta->max_rate_idx != -1))
2718 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2719 if ((lq_sta->max_rate_idx < 0) ||
2720 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2721 lq_sta->max_rate_idx = -1;
2722 }
2723
2724 /* Treat uninitialized rate scaling data same as non-existing. */
2725 if (lq_sta && !lq_sta->drv) {
2726 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
2727 priv_sta = NULL;
2728 }
2729
2730 /* Send management frames and NO_ACK data using lowest rate. */
2731 if (rate_control_send_low(sta, priv_sta, txrc))
2732 return;
2733
2734 rate_idx = lq_sta->last_txrate_idx;
2735
2736 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2737 rate_idx -= IWL_FIRST_OFDM_RATE;
2738 /* 6M and 9M shared same MCS index */
2739 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2740 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2741 IWL_RATE_MIMO3_6M_PLCP)
2742 rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2743 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2744 IWL_RATE_MIMO2_6M_PLCP)
2745 rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2746 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2747 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2748 info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2749 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2750 info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
2751 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2752 info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2753 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2754 info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2755 } else {
2756 /* Check for invalid rates */
2757 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2758 ((sband->band == IEEE80211_BAND_5GHZ) &&
2759 (rate_idx < IWL_FIRST_OFDM_RATE)))
2760 rate_idx = rate_lowest_index(sband, sta);
2761 /* On valid 5 GHz rate, adjust index */
2762 else if (sband->band == IEEE80211_BAND_5GHZ)
2763 rate_idx -= IWL_FIRST_OFDM_RATE;
2764 info->control.rates[0].flags = 0;
2765 }
2766 info->control.rates[0].idx = rate_idx;
2767
2768 }
2769
2770 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2771 gfp_t gfp)
2772 {
2773 struct iwl_lq_sta *lq_sta;
2774 struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2775 struct iwl_priv *priv;
2776
2777 priv = (struct iwl_priv *)priv_rate;
2778 IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2779
2780 lq_sta = &sta_priv->lq_sta;
2781
2782 return lq_sta;
2783 }
2784
2785 /*
2786 * Called after adding a new station to initialize rate scaling
2787 */
2788 void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id)
2789 {
2790 int i, j;
2791 struct ieee80211_hw *hw = priv->hw;
2792 struct ieee80211_conf *conf = &priv->hw->conf;
2793 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2794 struct iwl_station_priv *sta_priv;
2795 struct iwl_lq_sta *lq_sta;
2796 struct ieee80211_supported_band *sband;
2797
2798 sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2799 lq_sta = &sta_priv->lq_sta;
2800 sband = hw->wiphy->bands[conf->channel->band];
2801
2802
2803 lq_sta->lq.sta_id = sta_id;
2804
2805 for (j = 0; j < LQ_SIZE; j++)
2806 for (i = 0; i < IWL_RATE_COUNT; i++)
2807 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2808
2809 lq_sta->flush_timer = 0;
2810 lq_sta->supp_rates = sta->supp_rates[sband->band];
2811 for (j = 0; j < LQ_SIZE; j++)
2812 for (i = 0; i < IWL_RATE_COUNT; i++)
2813 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2814
2815 IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n",
2816 sta_id);
2817 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2818 * the lowest or the highest rate.. Could consider using RSSI from
2819 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2820 * after assoc.. */
2821
2822 lq_sta->is_dup = 0;
2823 lq_sta->max_rate_idx = -1;
2824 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2825 lq_sta->is_green = rs_use_green(sta);
2826 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2827 lq_sta->band = priv->band;
2828 /*
2829 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2830 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2831 */
2832 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2833 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2834 lq_sta->active_siso_rate &= ~((u16)0x2);
2835 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2836
2837 /* Same here */
2838 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2839 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2840 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2841 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2842
2843 lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2844 lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2845 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2846 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2847
2848 IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2849 lq_sta->active_siso_rate,
2850 lq_sta->active_mimo2_rate,
2851 lq_sta->active_mimo3_rate);
2852
2853 /* These values will be overridden later */
2854 lq_sta->lq.general_params.single_stream_ant_msk =
2855 first_antenna(priv->hw_params.valid_tx_ant);
2856 lq_sta->lq.general_params.dual_stream_ant_msk =
2857 priv->hw_params.valid_tx_ant &
2858 ~first_antenna(priv->hw_params.valid_tx_ant);
2859 if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2860 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2861 } else if (num_of_ant(priv->hw_params.valid_tx_ant) == 2) {
2862 lq_sta->lq.general_params.dual_stream_ant_msk =
2863 priv->hw_params.valid_tx_ant;
2864 }
2865
2866 /* as default allow aggregation for all tids */
2867 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2868 lq_sta->drv = priv;
2869
2870 /* Set last_txrate_idx to lowest rate */
2871 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2872 if (sband->band == IEEE80211_BAND_5GHZ)
2873 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2874 lq_sta->is_agg = 0;
2875
2876 #ifdef CONFIG_MAC80211_DEBUGFS
2877 lq_sta->dbg_fixed_rate = 0;
2878 #endif
2879
2880 rs_initialize_lq(priv, conf, sta, lq_sta);
2881 }
2882
2883 static void rs_fill_link_cmd(struct iwl_priv *priv,
2884 struct iwl_lq_sta *lq_sta, u32 new_rate)
2885 {
2886 struct iwl_scale_tbl_info tbl_type;
2887 int index = 0;
2888 int rate_idx;
2889 int repeat_rate = 0;
2890 u8 ant_toggle_cnt = 0;
2891 u8 use_ht_possible = 1;
2892 u8 valid_tx_ant = 0;
2893 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2894
2895 /* Override starting rate (index 0) if needed for debug purposes */
2896 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2897
2898 /* Interpret new_rate (rate_n_flags) */
2899 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2900 &tbl_type, &rate_idx);
2901
2902 if (priv && priv->bt_full_concurrent) {
2903 /* 1x1 only */
2904 tbl_type.ant_type =
2905 first_antenna(priv->hw_params.valid_tx_ant);
2906 }
2907
2908 /* How many times should we repeat the initial rate? */
2909 if (is_legacy(tbl_type.lq_type)) {
2910 ant_toggle_cnt = 1;
2911 repeat_rate = IWL_NUMBER_TRY;
2912 } else {
2913 repeat_rate = IWL_HT_NUMBER_TRY;
2914 }
2915
2916 lq_cmd->general_params.mimo_delimiter =
2917 is_mimo(tbl_type.lq_type) ? 1 : 0;
2918
2919 /* Fill 1st table entry (index 0) */
2920 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2921
2922 if (num_of_ant(tbl_type.ant_type) == 1) {
2923 lq_cmd->general_params.single_stream_ant_msk =
2924 tbl_type.ant_type;
2925 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2926 lq_cmd->general_params.dual_stream_ant_msk =
2927 tbl_type.ant_type;
2928 } /* otherwise we don't modify the existing value */
2929
2930 index++;
2931 repeat_rate--;
2932 if (priv) {
2933 if (priv->bt_full_concurrent)
2934 valid_tx_ant = ANT_A;
2935 else
2936 valid_tx_ant = priv->hw_params.valid_tx_ant;
2937 }
2938
2939 /* Fill rest of rate table */
2940 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2941 /* Repeat initial/next rate.
2942 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2943 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2944 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2945 if (is_legacy(tbl_type.lq_type)) {
2946 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2947 ant_toggle_cnt++;
2948 else if (priv &&
2949 rs_toggle_antenna(valid_tx_ant,
2950 &new_rate, &tbl_type))
2951 ant_toggle_cnt = 1;
2952 }
2953
2954 /* Override next rate if needed for debug purposes */
2955 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2956
2957 /* Fill next table entry */
2958 lq_cmd->rs_table[index].rate_n_flags =
2959 cpu_to_le32(new_rate);
2960 repeat_rate--;
2961 index++;
2962 }
2963
2964 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2965 &rate_idx);
2966
2967 if (priv && priv->bt_full_concurrent) {
2968 /* 1x1 only */
2969 tbl_type.ant_type =
2970 first_antenna(priv->hw_params.valid_tx_ant);
2971 }
2972
2973 /* Indicate to uCode which entries might be MIMO.
2974 * If initial rate was MIMO, this will finally end up
2975 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2976 if (is_mimo(tbl_type.lq_type))
2977 lq_cmd->general_params.mimo_delimiter = index;
2978
2979 /* Get next rate */
2980 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2981 use_ht_possible);
2982
2983 /* How many times should we repeat the next rate? */
2984 if (is_legacy(tbl_type.lq_type)) {
2985 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2986 ant_toggle_cnt++;
2987 else if (priv &&
2988 rs_toggle_antenna(valid_tx_ant,
2989 &new_rate, &tbl_type))
2990 ant_toggle_cnt = 1;
2991
2992 repeat_rate = IWL_NUMBER_TRY;
2993 } else {
2994 repeat_rate = IWL_HT_NUMBER_TRY;
2995 }
2996
2997 /* Don't allow HT rates after next pass.
2998 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2999 use_ht_possible = 0;
3000
3001 /* Override next rate if needed for debug purposes */
3002 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
3003
3004 /* Fill next table entry */
3005 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
3006
3007 index++;
3008 repeat_rate--;
3009 }
3010
3011 lq_cmd->agg_params.agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3012 lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
3013
3014 lq_cmd->agg_params.agg_time_limit =
3015 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
3016 /*
3017 * overwrite if needed, pass aggregation time limit
3018 * to uCode in uSec
3019 */
3020 if (priv && priv->cfg->bt_params &&
3021 priv->cfg->bt_params->agg_time_limit &&
3022 priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH)
3023 lq_cmd->agg_params.agg_time_limit =
3024 cpu_to_le16(priv->cfg->bt_params->agg_time_limit);
3025 }
3026
3027 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3028 {
3029 return hw->priv;
3030 }
3031 /* rate scale requires free function to be implemented */
3032 static void rs_free(void *priv_rate)
3033 {
3034 return;
3035 }
3036
3037 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
3038 void *priv_sta)
3039 {
3040 struct iwl_priv *priv __maybe_unused = priv_r;
3041
3042 IWL_DEBUG_RATE(priv, "enter\n");
3043 IWL_DEBUG_RATE(priv, "leave\n");
3044 }
3045
3046
3047 #ifdef CONFIG_MAC80211_DEBUGFS
3048 static int open_file_generic(struct inode *inode, struct file *file)
3049 {
3050 file->private_data = inode->i_private;
3051 return 0;
3052 }
3053 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
3054 u32 *rate_n_flags, int index)
3055 {
3056 struct iwl_priv *priv;
3057 u8 valid_tx_ant;
3058 u8 ant_sel_tx;
3059
3060 priv = lq_sta->drv;
3061 valid_tx_ant = priv->hw_params.valid_tx_ant;
3062 if (lq_sta->dbg_fixed_rate) {
3063 ant_sel_tx =
3064 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
3065 >> RATE_MCS_ANT_POS);
3066 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
3067 *rate_n_flags = lq_sta->dbg_fixed_rate;
3068 IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
3069 } else {
3070 lq_sta->dbg_fixed_rate = 0;
3071 IWL_ERR(priv,
3072 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
3073 ant_sel_tx, valid_tx_ant);
3074 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3075 }
3076 } else {
3077 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3078 }
3079 }
3080
3081 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3082 const char __user *user_buf, size_t count, loff_t *ppos)
3083 {
3084 struct iwl_lq_sta *lq_sta = file->private_data;
3085 struct iwl_priv *priv;
3086 char buf[64];
3087 int buf_size;
3088 u32 parsed_rate;
3089 struct iwl_station_priv *sta_priv =
3090 container_of(lq_sta, struct iwl_station_priv, lq_sta);
3091 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
3092
3093 priv = lq_sta->drv;
3094 memset(buf, 0, sizeof(buf));
3095 buf_size = min(count, sizeof(buf) - 1);
3096 if (copy_from_user(buf, user_buf, buf_size))
3097 return -EFAULT;
3098
3099 if (sscanf(buf, "%x", &parsed_rate) == 1)
3100 lq_sta->dbg_fixed_rate = parsed_rate;
3101 else
3102 lq_sta->dbg_fixed_rate = 0;
3103
3104 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
3105 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3106 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3107 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3108
3109 IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
3110 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
3111
3112 if (lq_sta->dbg_fixed_rate) {
3113 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
3114 iwl_send_lq_cmd(lq_sta->drv, ctx, &lq_sta->lq, CMD_ASYNC,
3115 false);
3116 }
3117
3118 return count;
3119 }
3120
3121 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3122 char __user *user_buf, size_t count, loff_t *ppos)
3123 {
3124 char *buff;
3125 int desc = 0;
3126 int i = 0;
3127 int index = 0;
3128 ssize_t ret;
3129
3130 struct iwl_lq_sta *lq_sta = file->private_data;
3131 struct iwl_priv *priv;
3132 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3133
3134 priv = lq_sta->drv;
3135 buff = kmalloc(1024, GFP_KERNEL);
3136 if (!buff)
3137 return -ENOMEM;
3138
3139 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3140 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
3141 lq_sta->total_failed, lq_sta->total_success,
3142 lq_sta->active_legacy_rate);
3143 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3144 lq_sta->dbg_fixed_rate);
3145 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3146 (priv->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
3147 (priv->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
3148 (priv->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
3149 desc += sprintf(buff+desc, "lq type %s\n",
3150 (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
3151 if (is_Ht(tbl->lq_type)) {
3152 desc += sprintf(buff+desc, " %s",
3153 (is_siso(tbl->lq_type)) ? "SISO" :
3154 ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
3155 desc += sprintf(buff+desc, " %s",
3156 (tbl->is_ht40) ? "40MHz" : "20MHz");
3157 desc += sprintf(buff+desc, " %s %s %s\n", (tbl->is_SGI) ? "SGI" : "",
3158 (lq_sta->is_green) ? "GF enabled" : "",
3159 (lq_sta->is_agg) ? "AGG on" : "");
3160 }
3161 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3162 lq_sta->last_rate_n_flags);
3163 desc += sprintf(buff+desc, "general:"
3164 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
3165 lq_sta->lq.general_params.flags,
3166 lq_sta->lq.general_params.mimo_delimiter,
3167 lq_sta->lq.general_params.single_stream_ant_msk,
3168 lq_sta->lq.general_params.dual_stream_ant_msk);
3169
3170 desc += sprintf(buff+desc, "agg:"
3171 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3172 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
3173 lq_sta->lq.agg_params.agg_dis_start_th,
3174 lq_sta->lq.agg_params.agg_frame_cnt_limit);
3175
3176 desc += sprintf(buff+desc,
3177 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3178 lq_sta->lq.general_params.start_rate_index[0],
3179 lq_sta->lq.general_params.start_rate_index[1],
3180 lq_sta->lq.general_params.start_rate_index[2],
3181 lq_sta->lq.general_params.start_rate_index[3]);
3182
3183 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3184 index = iwl_hwrate_to_plcp_idx(
3185 le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
3186 if (is_legacy(tbl->lq_type)) {
3187 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
3188 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3189 iwl_rate_mcs[index].mbps);
3190 } else {
3191 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
3192 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3193 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
3194 }
3195 }
3196
3197 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3198 kfree(buff);
3199 return ret;
3200 }
3201
3202 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3203 .write = rs_sta_dbgfs_scale_table_write,
3204 .read = rs_sta_dbgfs_scale_table_read,
3205 .open = open_file_generic,
3206 .llseek = default_llseek,
3207 };
3208 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3209 char __user *user_buf, size_t count, loff_t *ppos)
3210 {
3211 char *buff;
3212 int desc = 0;
3213 int i, j;
3214 ssize_t ret;
3215
3216 struct iwl_lq_sta *lq_sta = file->private_data;
3217
3218 buff = kmalloc(1024, GFP_KERNEL);
3219 if (!buff)
3220 return -ENOMEM;
3221
3222 for (i = 0; i < LQ_SIZE; i++) {
3223 desc += sprintf(buff+desc,
3224 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
3225 "rate=0x%X\n",
3226 lq_sta->active_tbl == i ? "*" : "x",
3227 lq_sta->lq_info[i].lq_type,
3228 lq_sta->lq_info[i].is_SGI,
3229 lq_sta->lq_info[i].is_ht40,
3230 lq_sta->lq_info[i].is_dup,
3231 lq_sta->is_green,
3232 lq_sta->lq_info[i].current_rate);
3233 for (j = 0; j < IWL_RATE_COUNT; j++) {
3234 desc += sprintf(buff+desc,
3235 "counter=%d success=%d %%=%d\n",
3236 lq_sta->lq_info[i].win[j].counter,
3237 lq_sta->lq_info[i].win[j].success_counter,
3238 lq_sta->lq_info[i].win[j].success_ratio);
3239 }
3240 }
3241 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3242 kfree(buff);
3243 return ret;
3244 }
3245
3246 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3247 .read = rs_sta_dbgfs_stats_table_read,
3248 .open = open_file_generic,
3249 .llseek = default_llseek,
3250 };
3251
3252 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3253 char __user *user_buf, size_t count, loff_t *ppos)
3254 {
3255 char buff[120];
3256 int desc = 0;
3257 ssize_t ret;
3258
3259 struct iwl_lq_sta *lq_sta = file->private_data;
3260 struct iwl_priv *priv;
3261 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3262
3263 priv = lq_sta->drv;
3264
3265 if (is_Ht(tbl->lq_type))
3266 desc += sprintf(buff+desc,
3267 "Bit Rate= %d Mb/s\n",
3268 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3269 else
3270 desc += sprintf(buff+desc,
3271 "Bit Rate= %d Mb/s\n",
3272 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3273
3274 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3275 return ret;
3276 }
3277
3278 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3279 .read = rs_sta_dbgfs_rate_scale_data_read,
3280 .open = open_file_generic,
3281 .llseek = default_llseek,
3282 };
3283
3284 static void rs_add_debugfs(void *priv, void *priv_sta,
3285 struct dentry *dir)
3286 {
3287 struct iwl_lq_sta *lq_sta = priv_sta;
3288 lq_sta->rs_sta_dbgfs_scale_table_file =
3289 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3290 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3291 lq_sta->rs_sta_dbgfs_stats_table_file =
3292 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3293 lq_sta, &rs_sta_dbgfs_stats_table_ops);
3294 lq_sta->rs_sta_dbgfs_rate_scale_data_file =
3295 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
3296 lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
3297 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
3298 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3299 &lq_sta->tx_agg_tid_en);
3300
3301 }
3302
3303 static void rs_remove_debugfs(void *priv, void *priv_sta)
3304 {
3305 struct iwl_lq_sta *lq_sta = priv_sta;
3306 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3307 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
3308 debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
3309 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
3310 }
3311 #endif
3312
3313 /*
3314 * Initialization of rate scaling information is done by driver after
3315 * the station is added. Since mac80211 calls this function before a
3316 * station is added we ignore it.
3317 */
3318 static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband,
3319 struct ieee80211_sta *sta, void *priv_sta)
3320 {
3321 }
3322 static struct rate_control_ops rs_ops = {
3323 .module = NULL,
3324 .name = RS_NAME,
3325 .tx_status = rs_tx_status,
3326 .get_rate = rs_get_rate,
3327 .rate_init = rs_rate_init_stub,
3328 .alloc = rs_alloc,
3329 .free = rs_free,
3330 .alloc_sta = rs_alloc_sta,
3331 .free_sta = rs_free_sta,
3332 #ifdef CONFIG_MAC80211_DEBUGFS
3333 .add_sta_debugfs = rs_add_debugfs,
3334 .remove_sta_debugfs = rs_remove_debugfs,
3335 #endif
3336 };
3337
3338 int iwlagn_rate_control_register(void)
3339 {
3340 return ieee80211_rate_control_register(&rs_ops);
3341 }
3342
3343 void iwlagn_rate_control_unregister(void)
3344 {
3345 ieee80211_rate_control_unregister(&rs_ops);
3346 }
3347
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