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ARM: mm: Recreate kernel mappings in early_paging_init()
[linux/fpc-iii.git] / drivers / net / wireless / iwlwifi / dvm / rs.c
blobb647e506564cb78cd6117a70c0e09a3036c69d7b
1 /******************************************************************************
2 *
3 * Copyright(c) 2005 - 2013 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 <net/mac80211.h>
31
32 #include <linux/netdevice.h>
33 #include <linux/etherdevice.h>
34 #include <linux/delay.h>
35
36 #include <linux/workqueue.h>
37
38 #include "dev.h"
39 #include "agn.h"
40
41 #define RS_NAME "iwl-agn-rs"
42
43 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
44 #define IWL_NUMBER_TRY 1
45 #define IWL_HT_NUMBER_TRY 3
46
47 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
48 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
49 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
50
51 /* max allowed rate miss before sync LQ cmd */
52 #define IWL_MISSED_RATE_MAX 15
53 /* max time to accum history 2 seconds */
54 #define IWL_RATE_SCALE_FLUSH_INTVL (3*HZ)
55
56 static u8 rs_ht_to_legacy[] = {
57 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
58 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
59 IWL_RATE_6M_INDEX,
60 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
61 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
62 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
63 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
64 };
65
66 static const u8 ant_toggle_lookup[] = {
67 /*ANT_NONE -> */ ANT_NONE,
68 /*ANT_A -> */ ANT_B,
69 /*ANT_B -> */ ANT_C,
70 /*ANT_AB -> */ ANT_BC,
71 /*ANT_C -> */ ANT_A,
72 /*ANT_AC -> */ ANT_AB,
73 /*ANT_BC -> */ ANT_AC,
74 /*ANT_ABC -> */ ANT_ABC,
75 };
76
77 #define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np) \
78 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
79 IWL_RATE_SISO_##s##M_PLCP, \
80 IWL_RATE_MIMO2_##s##M_PLCP,\
81 IWL_RATE_MIMO3_##s##M_PLCP,\
82 IWL_RATE_##r##M_IEEE, \
83 IWL_RATE_##ip##M_INDEX, \
84 IWL_RATE_##in##M_INDEX, \
85 IWL_RATE_##rp##M_INDEX, \
86 IWL_RATE_##rn##M_INDEX, \
87 IWL_RATE_##pp##M_INDEX, \
88 IWL_RATE_##np##M_INDEX }
89
90 /*
91 * Parameter order:
92 * rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
93 *
94 * If there isn't a valid next or previous rate then INV is used which
95 * maps to IWL_RATE_INVALID
96 *
97 */
98 const struct iwl_rate_info iwl_rates[IWL_RATE_COUNT] = {
99 IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2), /* 1mbps */
100 IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5), /* 2mbps */
101 IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11), /*5.5mbps */
102 IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18), /* 11mbps */
103 IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11), /* 6mbps */
104 IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11), /* 9mbps */
105 IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18), /* 12mbps */
106 IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24), /* 18mbps */
107 IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36), /* 24mbps */
108 IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48), /* 36mbps */
109 IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54), /* 48mbps */
110 IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
111 IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
112 /* FIXME:RS: ^^ should be INV (legacy) */
113 };
114
115 static inline u8 rs_extract_rate(u32 rate_n_flags)
116 {
117 return (u8)(rate_n_flags & RATE_MCS_RATE_MSK);
118 }
119
120 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
121 {
122 int idx = 0;
123
124 /* HT rate format */
125 if (rate_n_flags & RATE_MCS_HT_MSK) {
126 idx = rs_extract_rate(rate_n_flags);
127
128 if (idx >= IWL_RATE_MIMO3_6M_PLCP)
129 idx = idx - IWL_RATE_MIMO3_6M_PLCP;
130 else if (idx >= IWL_RATE_MIMO2_6M_PLCP)
131 idx = idx - IWL_RATE_MIMO2_6M_PLCP;
132
133 idx += IWL_FIRST_OFDM_RATE;
134 /* skip 9M not supported in ht*/
135 if (idx >= IWL_RATE_9M_INDEX)
136 idx += 1;
137 if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE))
138 return idx;
139
140 /* legacy rate format, search for match in table */
141 } else {
142 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
143 if (iwl_rates[idx].plcp ==
144 rs_extract_rate(rate_n_flags))
145 return idx;
146 }
147
148 return -1;
149 }
150
151 static void rs_rate_scale_perform(struct iwl_priv *priv,
152 struct sk_buff *skb,
153 struct ieee80211_sta *sta,
154 struct iwl_lq_sta *lq_sta);
155 static void rs_fill_link_cmd(struct iwl_priv *priv,
156 struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
157 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
158
159
160 #ifdef CONFIG_MAC80211_DEBUGFS
161 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
162 u32 *rate_n_flags, int index);
163 #else
164 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
165 u32 *rate_n_flags, int index)
166 {}
167 #endif
168
169 /**
170 * The following tables contain the expected throughput metrics for all rates
171 *
172 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
173 *
174 * where invalid entries are zeros.
175 *
176 * CCK rates are only valid in legacy table and will only be used in G
177 * (2.4 GHz) band.
178 */
179
180 static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
181 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
182 };
183
184 static s32 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
185 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202}, /* Norm */
186 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210}, /* SGI */
187 {0, 0, 0, 0, 47, 0, 91, 133, 171, 242, 305, 334, 362}, /* AGG */
188 {0, 0, 0, 0, 52, 0, 101, 145, 187, 264, 330, 361, 390}, /* AGG+SGI */
189 };
190
191 static s32 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
192 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
193 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
194 {0, 0, 0, 0, 94, 0, 177, 249, 313, 423, 512, 550, 586}, /* AGG */
195 {0, 0, 0, 0, 104, 0, 193, 270, 338, 454, 545, 584, 620}, /* AGG+SGI */
196 };
197
198 static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
199 {0, 0, 0, 0, 74, 0, 123, 155, 179, 214, 236, 244, 251}, /* Norm */
200 {0, 0, 0, 0, 81, 0, 131, 164, 188, 223, 243, 251, 257}, /* SGI */
201 {0, 0, 0, 0, 89, 0, 167, 235, 296, 402, 488, 526, 560}, /* AGG */
202 {0, 0, 0, 0, 97, 0, 182, 255, 320, 431, 520, 558, 593}, /* AGG+SGI*/
203 };
204
205 static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
206 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
207 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
208 {0, 0, 0, 0, 171, 0, 305, 410, 496, 634, 731, 771, 805}, /* AGG */
209 {0, 0, 0, 0, 186, 0, 329, 439, 527, 667, 764, 803, 838}, /* AGG+SGI */
210 };
211
212 static s32 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = {
213 {0, 0, 0, 0, 99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */
214 {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */
215 {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */
216 {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */
217 };
218
219 static s32 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = {
220 {0, 0, 0, 0, 152, 0, 211, 239, 255, 279, 290, 294, 297}, /* Norm */
221 {0, 0, 0, 0, 160, 0, 219, 245, 261, 284, 294, 297, 300}, /* SGI */
222 {0, 0, 0, 0, 254, 0, 443, 584, 695, 868, 984, 1030, 1070}, /* AGG */
223 {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */
224 };
225
226 /* mbps, mcs */
227 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
228 { "1", "BPSK DSSS"},
229 { "2", "QPSK DSSS"},
230 {"5.5", "BPSK CCK"},
231 { "11", "QPSK CCK"},
232 { "6", "BPSK 1/2"},
233 { "9", "BPSK 1/2"},
234 { "12", "QPSK 1/2"},
235 { "18", "QPSK 3/4"},
236 { "24", "16QAM 1/2"},
237 { "36", "16QAM 3/4"},
238 { "48", "64QAM 2/3"},
239 { "54", "64QAM 3/4"},
240 { "60", "64QAM 5/6"},
241 };
242
243 #define MCS_INDEX_PER_STREAM (8)
244
245 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
246 {
247 window->data = 0;
248 window->success_counter = 0;
249 window->success_ratio = IWL_INVALID_VALUE;
250 window->counter = 0;
251 window->average_tpt = IWL_INVALID_VALUE;
252 window->stamp = 0;
253 }
254
255 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
256 {
257 return (ant_type & valid_antenna) == ant_type;
258 }
259
260 /*
261 * removes the old data from the statistics. All data that is older than
262 * TID_MAX_TIME_DIFF, will be deleted.
263 */
264 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
265 {
266 /* The oldest age we want to keep */
267 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
268
269 while (tl->queue_count &&
270 (tl->time_stamp < oldest_time)) {
271 tl->total -= tl->packet_count[tl->head];
272 tl->packet_count[tl->head] = 0;
273 tl->time_stamp += TID_QUEUE_CELL_SPACING;
274 tl->queue_count--;
275 tl->head++;
276 if (tl->head >= TID_QUEUE_MAX_SIZE)
277 tl->head = 0;
278 }
279 }
280
281 /*
282 * increment traffic load value for tid and also remove
283 * any old values if passed the certain time period
284 */
285 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
286 struct ieee80211_hdr *hdr)
287 {
288 u32 curr_time = jiffies_to_msecs(jiffies);
289 u32 time_diff;
290 s32 index;
291 struct iwl_traffic_load *tl = NULL;
292 u8 tid;
293
294 if (ieee80211_is_data_qos(hdr->frame_control)) {
295 u8 *qc = ieee80211_get_qos_ctl(hdr);
296 tid = qc[0] & 0xf;
297 } else
298 return IWL_MAX_TID_COUNT;
299
300 if (unlikely(tid >= IWL_MAX_TID_COUNT))
301 return IWL_MAX_TID_COUNT;
302
303 tl = &lq_data->load[tid];
304
305 curr_time -= curr_time % TID_ROUND_VALUE;
306
307 /* Happens only for the first packet. Initialize the data */
308 if (!(tl->queue_count)) {
309 tl->total = 1;
310 tl->time_stamp = curr_time;
311 tl->queue_count = 1;
312 tl->head = 0;
313 tl->packet_count[0] = 1;
314 return IWL_MAX_TID_COUNT;
315 }
316
317 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
318 index = time_diff / TID_QUEUE_CELL_SPACING;
319
320 /* The history is too long: remove data that is older than */
321 /* TID_MAX_TIME_DIFF */
322 if (index >= TID_QUEUE_MAX_SIZE)
323 rs_tl_rm_old_stats(tl, curr_time);
324
325 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
326 tl->packet_count[index] = tl->packet_count[index] + 1;
327 tl->total = tl->total + 1;
328
329 if ((index + 1) > tl->queue_count)
330 tl->queue_count = index + 1;
331
332 return tid;
333 }
334
335 #ifdef CONFIG_MAC80211_DEBUGFS
336 /**
337 * Program the device to use fixed rate for frame transmit
338 * This is for debugging/testing only
339 * once the device start use fixed rate, we need to reload the module
340 * to being back the normal operation.
341 */
342 static void rs_program_fix_rate(struct iwl_priv *priv,
343 struct iwl_lq_sta *lq_sta)
344 {
345 struct iwl_station_priv *sta_priv =
346 container_of(lq_sta, struct iwl_station_priv, lq_sta);
347 struct iwl_rxon_context *ctx = sta_priv->ctx;
348
349 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
350 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
351 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
352 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
353
354 IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
355 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
356
357 if (lq_sta->dbg_fixed_rate) {
358 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
359 iwl_send_lq_cmd(lq_sta->drv, ctx, &lq_sta->lq, CMD_ASYNC,
360 false);
361 }
362 }
363 #endif
364
365 /*
366 get the traffic load value for tid
367 */
368 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
369 {
370 u32 curr_time = jiffies_to_msecs(jiffies);
371 u32 time_diff;
372 s32 index;
373 struct iwl_traffic_load *tl = NULL;
374
375 if (tid >= IWL_MAX_TID_COUNT)
376 return 0;
377
378 tl = &(lq_data->load[tid]);
379
380 curr_time -= curr_time % TID_ROUND_VALUE;
381
382 if (!(tl->queue_count))
383 return 0;
384
385 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
386 index = time_diff / TID_QUEUE_CELL_SPACING;
387
388 /* The history is too long: remove data that is older than */
389 /* TID_MAX_TIME_DIFF */
390 if (index >= TID_QUEUE_MAX_SIZE)
391 rs_tl_rm_old_stats(tl, curr_time);
392
393 return tl->total;
394 }
395
396 static int rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
397 struct iwl_lq_sta *lq_data, u8 tid,
398 struct ieee80211_sta *sta)
399 {
400 int ret = -EAGAIN;
401 u32 load;
402
403 /*
404 * Don't create TX aggregation sessions when in high
405 * BT traffic, as they would just be disrupted by BT.
406 */
407 if (priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) {
408 IWL_DEBUG_COEX(priv,
409 "BT traffic (%d), no aggregation allowed\n",
410 priv->bt_traffic_load);
411 return ret;
412 }
413
414 load = rs_tl_get_load(lq_data, tid);
415
416 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
417 sta->addr, tid);
418 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
419 if (ret == -EAGAIN) {
420 /*
421 * driver and mac80211 is out of sync
422 * this might be cause by reloading firmware
423 * stop the tx ba session here
424 */
425 IWL_ERR(priv, "Fail start Tx agg on tid: %d\n",
426 tid);
427 ieee80211_stop_tx_ba_session(sta, tid);
428 }
429 return ret;
430 }
431
432 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
433 struct iwl_lq_sta *lq_data,
434 struct ieee80211_sta *sta)
435 {
436 if (tid < IWL_MAX_TID_COUNT)
437 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
438 else
439 IWL_ERR(priv, "tid exceeds max TID count: %d/%d\n",
440 tid, IWL_MAX_TID_COUNT);
441 }
442
443 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
444 {
445 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
446 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
447 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
448 }
449
450 /*
451 * Static function to get the expected throughput from an iwl_scale_tbl_info
452 * that wraps a NULL pointer check
453 */
454 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
455 {
456 if (tbl->expected_tpt)
457 return tbl->expected_tpt[rs_index];
458 return 0;
459 }
460
461 /**
462 * rs_collect_tx_data - Update the success/failure sliding window
463 *
464 * We keep a sliding window of the last 62 packets transmitted
465 * at this rate. window->data contains the bitmask of successful
466 * packets.
467 */
468 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
469 int scale_index, int attempts, int successes)
470 {
471 struct iwl_rate_scale_data *window = NULL;
472 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
473 s32 fail_count, tpt;
474
475 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
476 return -EINVAL;
477
478 /* Select window for current tx bit rate */
479 window = &(tbl->win[scale_index]);
480
481 /* Get expected throughput */
482 tpt = get_expected_tpt(tbl, scale_index);
483
484 /*
485 * Keep track of only the latest 62 tx frame attempts in this rate's
486 * history window; anything older isn't really relevant any more.
487 * If we have filled up the sliding window, drop the oldest attempt;
488 * if the oldest attempt (highest bit in bitmap) shows "success",
489 * subtract "1" from the success counter (this is the main reason
490 * we keep these bitmaps!).
491 */
492 while (attempts > 0) {
493 if (window->counter >= IWL_RATE_MAX_WINDOW) {
494
495 /* remove earliest */
496 window->counter = IWL_RATE_MAX_WINDOW - 1;
497
498 if (window->data & mask) {
499 window->data &= ~mask;
500 window->success_counter--;
501 }
502 }
503
504 /* Increment frames-attempted counter */
505 window->counter++;
506
507 /* Shift bitmap by one frame to throw away oldest history */
508 window->data <<= 1;
509
510 /* Mark the most recent #successes attempts as successful */
511 if (successes > 0) {
512 window->success_counter++;
513 window->data |= 0x1;
514 successes--;
515 }
516
517 attempts--;
518 }
519
520 /* Calculate current success ratio, avoid divide-by-0! */
521 if (window->counter > 0)
522 window->success_ratio = 128 * (100 * window->success_counter)
523 / window->counter;
524 else
525 window->success_ratio = IWL_INVALID_VALUE;
526
527 fail_count = window->counter - window->success_counter;
528
529 /* Calculate average throughput, if we have enough history. */
530 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
531 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
532 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
533 else
534 window->average_tpt = IWL_INVALID_VALUE;
535
536 /* Tag this window as having been updated */
537 window->stamp = jiffies;
538
539 return 0;
540 }
541
542 /*
543 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
544 */
545 /* FIXME:RS:remove this function and put the flags statically in the table */
546 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
547 struct iwl_scale_tbl_info *tbl,
548 int index, u8 use_green)
549 {
550 u32 rate_n_flags = 0;
551
552 if (is_legacy(tbl->lq_type)) {
553 rate_n_flags = iwl_rates[index].plcp;
554 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
555 rate_n_flags |= RATE_MCS_CCK_MSK;
556
557 } else if (is_Ht(tbl->lq_type)) {
558 if (index > IWL_LAST_OFDM_RATE) {
559 IWL_ERR(priv, "Invalid HT rate index %d\n", index);
560 index = IWL_LAST_OFDM_RATE;
561 }
562 rate_n_flags = RATE_MCS_HT_MSK;
563
564 if (is_siso(tbl->lq_type))
565 rate_n_flags |= iwl_rates[index].plcp_siso;
566 else if (is_mimo2(tbl->lq_type))
567 rate_n_flags |= iwl_rates[index].plcp_mimo2;
568 else
569 rate_n_flags |= iwl_rates[index].plcp_mimo3;
570 } else {
571 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
572 }
573
574 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
575 RATE_MCS_ANT_ABC_MSK);
576
577 if (is_Ht(tbl->lq_type)) {
578 if (tbl->is_ht40) {
579 if (tbl->is_dup)
580 rate_n_flags |= RATE_MCS_DUP_MSK;
581 else
582 rate_n_flags |= RATE_MCS_HT40_MSK;
583 }
584 if (tbl->is_SGI)
585 rate_n_flags |= RATE_MCS_SGI_MSK;
586
587 if (use_green) {
588 rate_n_flags |= RATE_MCS_GF_MSK;
589 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
590 rate_n_flags &= ~RATE_MCS_SGI_MSK;
591 IWL_ERR(priv, "GF was set with SGI:SISO\n");
592 }
593 }
594 }
595 return rate_n_flags;
596 }
597
598 /*
599 * Interpret uCode API's rate_n_flags format,
600 * fill "search" or "active" tx mode table.
601 */
602 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
603 enum ieee80211_band band,
604 struct iwl_scale_tbl_info *tbl,
605 int *rate_idx)
606 {
607 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
608 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
609 u8 mcs;
610
611 memset(tbl, 0, sizeof(struct iwl_scale_tbl_info));
612 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
613
614 if (*rate_idx == IWL_RATE_INVALID) {
615 *rate_idx = -1;
616 return -EINVAL;
617 }
618 tbl->is_SGI = 0; /* default legacy setup */
619 tbl->is_ht40 = 0;
620 tbl->is_dup = 0;
621 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
622 tbl->lq_type = LQ_NONE;
623 tbl->max_search = IWL_MAX_SEARCH;
624
625 /* legacy rate format */
626 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
627 if (num_of_ant == 1) {
628 if (band == IEEE80211_BAND_5GHZ)
629 tbl->lq_type = LQ_A;
630 else
631 tbl->lq_type = LQ_G;
632 }
633 /* HT rate format */
634 } else {
635 if (rate_n_flags & RATE_MCS_SGI_MSK)
636 tbl->is_SGI = 1;
637
638 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
639 (rate_n_flags & RATE_MCS_DUP_MSK))
640 tbl->is_ht40 = 1;
641
642 if (rate_n_flags & RATE_MCS_DUP_MSK)
643 tbl->is_dup = 1;
644
645 mcs = rs_extract_rate(rate_n_flags);
646
647 /* SISO */
648 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
649 if (num_of_ant == 1)
650 tbl->lq_type = LQ_SISO; /*else NONE*/
651 /* MIMO2 */
652 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
653 if (num_of_ant == 2)
654 tbl->lq_type = LQ_MIMO2;
655 /* MIMO3 */
656 } else {
657 if (num_of_ant == 3) {
658 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
659 tbl->lq_type = LQ_MIMO3;
660 }
661 }
662 }
663 return 0;
664 }
665
666 /* switch to another antenna/antennas and return 1 */
667 /* if no other valid antenna found, return 0 */
668 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
669 struct iwl_scale_tbl_info *tbl)
670 {
671 u8 new_ant_type;
672
673 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
674 return 0;
675
676 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
677 return 0;
678
679 new_ant_type = ant_toggle_lookup[tbl->ant_type];
680
681 while ((new_ant_type != tbl->ant_type) &&
682 !rs_is_valid_ant(valid_ant, new_ant_type))
683 new_ant_type = ant_toggle_lookup[new_ant_type];
684
685 if (new_ant_type == tbl->ant_type)
686 return 0;
687
688 tbl->ant_type = new_ant_type;
689 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
690 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
691 return 1;
692 }
693
694 /**
695 * Green-field mode is valid if the station supports it and
696 * there are no non-GF stations present in the BSS.
697 */
698 static bool rs_use_green(struct ieee80211_sta *sta)
699 {
700 /*
701 * There's a bug somewhere in this code that causes the
702 * scaling to get stuck because GF+SGI can't be combined
703 * in SISO rates. Until we find that bug, disable GF, it
704 * has only limited benefit and we still interoperate with
705 * GF APs since we can always receive GF transmissions.
706 */
707 return false;
708 }
709
710 /**
711 * rs_get_supported_rates - get the available rates
712 *
713 * if management frame or broadcast frame only return
714 * basic available rates.
715 *
716 */
717 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
718 struct ieee80211_hdr *hdr,
719 enum iwl_table_type rate_type)
720 {
721 if (is_legacy(rate_type)) {
722 return lq_sta->active_legacy_rate;
723 } else {
724 if (is_siso(rate_type))
725 return lq_sta->active_siso_rate;
726 else if (is_mimo2(rate_type))
727 return lq_sta->active_mimo2_rate;
728 else
729 return lq_sta->active_mimo3_rate;
730 }
731 }
732
733 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
734 int rate_type)
735 {
736 u8 high = IWL_RATE_INVALID;
737 u8 low = IWL_RATE_INVALID;
738
739 /* 802.11A or ht walks to the next literal adjacent rate in
740 * the rate table */
741 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
742 int i;
743 u32 mask;
744
745 /* Find the previous rate that is in the rate mask */
746 i = index - 1;
747 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
748 if (rate_mask & mask) {
749 low = i;
750 break;
751 }
752 }
753
754 /* Find the next rate that is in the rate mask */
755 i = index + 1;
756 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
757 if (rate_mask & mask) {
758 high = i;
759 break;
760 }
761 }
762
763 return (high << 8) | low;
764 }
765
766 low = index;
767 while (low != IWL_RATE_INVALID) {
768 low = iwl_rates[low].prev_rs;
769 if (low == IWL_RATE_INVALID)
770 break;
771 if (rate_mask & (1 << low))
772 break;
773 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
774 }
775
776 high = index;
777 while (high != IWL_RATE_INVALID) {
778 high = iwl_rates[high].next_rs;
779 if (high == IWL_RATE_INVALID)
780 break;
781 if (rate_mask & (1 << high))
782 break;
783 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
784 }
785
786 return (high << 8) | low;
787 }
788
789 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
790 struct iwl_scale_tbl_info *tbl,
791 u8 scale_index, u8 ht_possible)
792 {
793 s32 low;
794 u16 rate_mask;
795 u16 high_low;
796 u8 switch_to_legacy = 0;
797 u8 is_green = lq_sta->is_green;
798 struct iwl_priv *priv = lq_sta->drv;
799
800 /* check if we need to switch from HT to legacy rates.
801 * assumption is that mandatory rates (1Mbps or 6Mbps)
802 * are always supported (spec demand) */
803 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
804 switch_to_legacy = 1;
805 scale_index = rs_ht_to_legacy[scale_index];
806 if (lq_sta->band == IEEE80211_BAND_5GHZ)
807 tbl->lq_type = LQ_A;
808 else
809 tbl->lq_type = LQ_G;
810
811 if (num_of_ant(tbl->ant_type) > 1)
812 tbl->ant_type =
813 first_antenna(priv->nvm_data->valid_tx_ant);
814
815 tbl->is_ht40 = 0;
816 tbl->is_SGI = 0;
817 tbl->max_search = IWL_MAX_SEARCH;
818 }
819
820 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
821
822 /* Mask with station rate restriction */
823 if (is_legacy(tbl->lq_type)) {
824 /* supp_rates has no CCK bits in A mode */
825 if (lq_sta->band == IEEE80211_BAND_5GHZ)
826 rate_mask = (u16)(rate_mask &
827 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
828 else
829 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
830 }
831
832 /* If we switched from HT to legacy, check current rate */
833 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
834 low = scale_index;
835 goto out;
836 }
837
838 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
839 tbl->lq_type);
840 low = high_low & 0xff;
841
842 if (low == IWL_RATE_INVALID)
843 low = scale_index;
844
845 out:
846 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
847 }
848
849 /*
850 * Simple function to compare two rate scale table types
851 */
852 static bool table_type_matches(struct iwl_scale_tbl_info *a,
853 struct iwl_scale_tbl_info *b)
854 {
855 return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
856 (a->is_SGI == b->is_SGI);
857 }
858
859 static void rs_bt_update_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
860 struct iwl_lq_sta *lq_sta)
861 {
862 struct iwl_scale_tbl_info *tbl;
863 bool full_concurrent = priv->bt_full_concurrent;
864
865 if (priv->bt_ant_couple_ok) {
866 /*
867 * Is there a need to switch between
868 * full concurrency and 3-wire?
869 */
870 if (priv->bt_ci_compliance && priv->bt_ant_couple_ok)
871 full_concurrent = true;
872 else
873 full_concurrent = false;
874 }
875 if ((priv->bt_traffic_load != priv->last_bt_traffic_load) ||
876 (priv->bt_full_concurrent != full_concurrent)) {
877 priv->bt_full_concurrent = full_concurrent;
878 priv->last_bt_traffic_load = priv->bt_traffic_load;
879
880 /* Update uCode's rate table. */
881 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
882 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
883 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
884
885 queue_work(priv->workqueue, &priv->bt_full_concurrency);
886 }
887 }
888
889 /*
890 * mac80211 sends us Tx status
891 */
892 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
893 struct ieee80211_sta *sta, void *priv_sta,
894 struct sk_buff *skb)
895 {
896 int legacy_success;
897 int retries;
898 int rs_index, mac_index, i;
899 struct iwl_lq_sta *lq_sta = priv_sta;
900 struct iwl_link_quality_cmd *table;
901 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
902 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)priv_r;
903 struct iwl_priv *priv = IWL_OP_MODE_GET_DVM(op_mode);
904 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
905 enum mac80211_rate_control_flags mac_flags;
906 u32 tx_rate;
907 struct iwl_scale_tbl_info tbl_type;
908 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
909 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
910 struct iwl_rxon_context *ctx = sta_priv->ctx;
911
912 IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
913
914 /* Treat uninitialized rate scaling data same as non-existing. */
915 if (!lq_sta) {
916 IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n");
917 return;
918 } else if (!lq_sta->drv) {
919 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
920 return;
921 }
922
923 if (!ieee80211_is_data(hdr->frame_control) ||
924 info->flags & IEEE80211_TX_CTL_NO_ACK)
925 return;
926
927 /* This packet was aggregated but doesn't carry status info */
928 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
929 !(info->flags & IEEE80211_TX_STAT_AMPDU))
930 return;
931
932 /*
933 * Ignore this Tx frame response if its initial rate doesn't match
934 * that of latest Link Quality command. There may be stragglers
935 * from a previous Link Quality command, but we're no longer interested
936 * in those; they're either from the "active" mode while we're trying
937 * to check "search" mode, or a prior "search" mode after we've moved
938 * to a new "search" mode (which might become the new "active" mode).
939 */
940 table = &lq_sta->lq;
941 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
942 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
943 if (priv->band == IEEE80211_BAND_5GHZ)
944 rs_index -= IWL_FIRST_OFDM_RATE;
945 mac_flags = info->status.rates[0].flags;
946 mac_index = info->status.rates[0].idx;
947 /* For HT packets, map MCS to PLCP */
948 if (mac_flags & IEEE80211_TX_RC_MCS) {
949 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
950 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
951 mac_index++;
952 /*
953 * mac80211 HT index is always zero-indexed; we need to move
954 * HT OFDM rates after CCK rates in 2.4 GHz band
955 */
956 if (priv->band == IEEE80211_BAND_2GHZ)
957 mac_index += IWL_FIRST_OFDM_RATE;
958 }
959 /* Here we actually compare this rate to the latest LQ command */
960 if ((mac_index < 0) ||
961 (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
962 (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
963 (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
964 (tbl_type.ant_type != info->status.antenna) ||
965 (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
966 (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
967 (rs_index != mac_index)) {
968 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate);
969 /*
970 * Since rates mis-match, the last LQ command may have failed.
971 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
972 * ... driver.
973 */
974 lq_sta->missed_rate_counter++;
975 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
976 lq_sta->missed_rate_counter = 0;
977 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
978 }
979 /* Regardless, ignore this status info for outdated rate */
980 return;
981 } else
982 /* Rate did match, so reset the missed_rate_counter */
983 lq_sta->missed_rate_counter = 0;
984
985 /* Figure out if rate scale algorithm is in active or search table */
986 if (table_type_matches(&tbl_type,
987 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
988 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
989 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
990 } else if (table_type_matches(&tbl_type,
991 &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
992 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
993 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
994 } else {
995 IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n");
996 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
997 IWL_DEBUG_RATE(priv, "active- lq:%x, ant:%x, SGI:%d\n",
998 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
999 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1000 IWL_DEBUG_RATE(priv, "search- lq:%x, ant:%x, SGI:%d\n",
1001 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
1002 IWL_DEBUG_RATE(priv, "actual- lq:%x, ant:%x, SGI:%d\n",
1003 tbl_type.lq_type, tbl_type.ant_type, tbl_type.is_SGI);
1004 /*
1005 * no matching table found, let's by-pass the data collection
1006 * and continue to perform rate scale to find the rate table
1007 */
1008 rs_stay_in_table(lq_sta, true);
1009 goto done;
1010 }
1011
1012 /*
1013 * Updating the frame history depends on whether packets were
1014 * aggregated.
1015 *
1016 * For aggregation, all packets were transmitted at the same rate, the
1017 * first index into rate scale table.
1018 */
1019 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1020 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
1021 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
1022 &rs_index);
1023 rs_collect_tx_data(curr_tbl, rs_index,
1024 info->status.ampdu_len,
1025 info->status.ampdu_ack_len);
1026
1027 /* Update success/fail counts if not searching for new mode */
1028 if (lq_sta->stay_in_tbl) {
1029 lq_sta->total_success += info->status.ampdu_ack_len;
1030 lq_sta->total_failed += (info->status.ampdu_len -
1031 info->status.ampdu_ack_len);
1032 }
1033 } else {
1034 /*
1035 * For legacy, update frame history with for each Tx retry.
1036 */
1037 retries = info->status.rates[0].count - 1;
1038 /* HW doesn't send more than 15 retries */
1039 retries = min(retries, 15);
1040
1041 /* The last transmission may have been successful */
1042 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1043 /* Collect data for each rate used during failed TX attempts */
1044 for (i = 0; i <= retries; ++i) {
1045 tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
1046 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
1047 &tbl_type, &rs_index);
1048 /*
1049 * Only collect stats if retried rate is in the same RS
1050 * table as active/search.
1051 */
1052 if (table_type_matches(&tbl_type, curr_tbl))
1053 tmp_tbl = curr_tbl;
1054 else if (table_type_matches(&tbl_type, other_tbl))
1055 tmp_tbl = other_tbl;
1056 else
1057 continue;
1058 rs_collect_tx_data(tmp_tbl, rs_index, 1,
1059 i < retries ? 0 : legacy_success);
1060 }
1061
1062 /* Update success/fail counts if not searching for new mode */
1063 if (lq_sta->stay_in_tbl) {
1064 lq_sta->total_success += legacy_success;
1065 lq_sta->total_failed += retries + (1 - legacy_success);
1066 }
1067 }
1068 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1069 lq_sta->last_rate_n_flags = tx_rate;
1070 done:
1071 /* See if there's a better rate or modulation mode to try. */
1072 if (sta && sta->supp_rates[sband->band])
1073 rs_rate_scale_perform(priv, skb, sta, lq_sta);
1074
1075 if (priv->lib->bt_params && priv->lib->bt_params->advanced_bt_coexist)
1076 rs_bt_update_lq(priv, ctx, lq_sta);
1077 }
1078
1079 /*
1080 * Begin a period of staying with a selected modulation mode.
1081 * Set "stay_in_tbl" flag to prevent any mode switches.
1082 * Set frame tx success limits according to legacy vs. high-throughput,
1083 * and reset overall (spanning all rates) tx success history statistics.
1084 * These control how long we stay using same modulation mode before
1085 * searching for a new mode.
1086 */
1087 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
1088 struct iwl_lq_sta *lq_sta)
1089 {
1090 IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
1091 lq_sta->stay_in_tbl = 1; /* only place this gets set */
1092 if (is_legacy) {
1093 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1094 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1095 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1096 } else {
1097 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1098 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1099 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1100 }
1101 lq_sta->table_count = 0;
1102 lq_sta->total_failed = 0;
1103 lq_sta->total_success = 0;
1104 lq_sta->flush_timer = jiffies;
1105 lq_sta->action_counter = 0;
1106 }
1107
1108 /*
1109 * Find correct throughput table for given mode of modulation
1110 */
1111 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1112 struct iwl_scale_tbl_info *tbl)
1113 {
1114 /* Used to choose among HT tables */
1115 s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1116
1117 /* Check for invalid LQ type */
1118 if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1119 tbl->expected_tpt = expected_tpt_legacy;
1120 return;
1121 }
1122
1123 /* Legacy rates have only one table */
1124 if (is_legacy(tbl->lq_type)) {
1125 tbl->expected_tpt = expected_tpt_legacy;
1126 return;
1127 }
1128
1129 /* Choose among many HT tables depending on number of streams
1130 * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
1131 * status */
1132 if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1133 ht_tbl_pointer = expected_tpt_siso20MHz;
1134 else if (is_siso(tbl->lq_type))
1135 ht_tbl_pointer = expected_tpt_siso40MHz;
1136 else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1137 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1138 else if (is_mimo2(tbl->lq_type))
1139 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1140 else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1141 ht_tbl_pointer = expected_tpt_mimo3_20MHz;
1142 else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
1143 ht_tbl_pointer = expected_tpt_mimo3_40MHz;
1144
1145 if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */
1146 tbl->expected_tpt = ht_tbl_pointer[0];
1147 else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */
1148 tbl->expected_tpt = ht_tbl_pointer[1];
1149 else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */
1150 tbl->expected_tpt = ht_tbl_pointer[2];
1151 else /* AGG+SGI */
1152 tbl->expected_tpt = ht_tbl_pointer[3];
1153 }
1154
1155 /*
1156 * Find starting rate for new "search" high-throughput mode of modulation.
1157 * Goal is to find lowest expected rate (under perfect conditions) that is
1158 * above the current measured throughput of "active" mode, to give new mode
1159 * a fair chance to prove itself without too many challenges.
1160 *
1161 * This gets called when transitioning to more aggressive modulation
1162 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1163 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1164 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1165 * bit rate will typically need to increase, but not if performance was bad.
1166 */
1167 static s32 rs_get_best_rate(struct iwl_priv *priv,
1168 struct iwl_lq_sta *lq_sta,
1169 struct iwl_scale_tbl_info *tbl, /* "search" */
1170 u16 rate_mask, s8 index)
1171 {
1172 /* "active" values */
1173 struct iwl_scale_tbl_info *active_tbl =
1174 &(lq_sta->lq_info[lq_sta->active_tbl]);
1175 s32 active_sr = active_tbl->win[index].success_ratio;
1176 s32 active_tpt = active_tbl->expected_tpt[index];
1177
1178 /* expected "search" throughput */
1179 s32 *tpt_tbl = tbl->expected_tpt;
1180
1181 s32 new_rate, high, low, start_hi;
1182 u16 high_low;
1183 s8 rate = index;
1184
1185 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1186
1187 for (; ;) {
1188 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1189 tbl->lq_type);
1190
1191 low = high_low & 0xff;
1192 high = (high_low >> 8) & 0xff;
1193
1194 /*
1195 * Lower the "search" bit rate, to give new "search" mode
1196 * approximately the same throughput as "active" if:
1197 *
1198 * 1) "Active" mode has been working modestly well (but not
1199 * great), and expected "search" throughput (under perfect
1200 * conditions) at candidate rate is above the actual
1201 * measured "active" throughput (but less than expected
1202 * "active" throughput under perfect conditions).
1203 * OR
1204 * 2) "Active" mode has been working perfectly or very well
1205 * and expected "search" throughput (under perfect
1206 * conditions) at candidate rate is above expected
1207 * "active" throughput (under perfect conditions).
1208 */
1209 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1210 ((active_sr > IWL_RATE_DECREASE_TH) &&
1211 (active_sr <= IWL_RATE_HIGH_TH) &&
1212 (tpt_tbl[rate] <= active_tpt))) ||
1213 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1214 (tpt_tbl[rate] > active_tpt))) {
1215
1216 /* (2nd or later pass)
1217 * If we've already tried to raise the rate, and are
1218 * now trying to lower it, use the higher rate. */
1219 if (start_hi != IWL_RATE_INVALID) {
1220 new_rate = start_hi;
1221 break;
1222 }
1223
1224 new_rate = rate;
1225
1226 /* Loop again with lower rate */
1227 if (low != IWL_RATE_INVALID)
1228 rate = low;
1229
1230 /* Lower rate not available, use the original */
1231 else
1232 break;
1233
1234 /* Else try to raise the "search" rate to match "active" */
1235 } else {
1236 /* (2nd or later pass)
1237 * If we've already tried to lower the rate, and are
1238 * now trying to raise it, use the lower rate. */
1239 if (new_rate != IWL_RATE_INVALID)
1240 break;
1241
1242 /* Loop again with higher rate */
1243 else if (high != IWL_RATE_INVALID) {
1244 start_hi = high;
1245 rate = high;
1246
1247 /* Higher rate not available, use the original */
1248 } else {
1249 new_rate = rate;
1250 break;
1251 }
1252 }
1253 }
1254
1255 return new_rate;
1256 }
1257
1258 /*
1259 * Set up search table for MIMO2
1260 */
1261 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1262 struct iwl_lq_sta *lq_sta,
1263 struct ieee80211_conf *conf,
1264 struct ieee80211_sta *sta,
1265 struct iwl_scale_tbl_info *tbl, int index)
1266 {
1267 u16 rate_mask;
1268 s32 rate;
1269 s8 is_green = lq_sta->is_green;
1270 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1271 struct iwl_rxon_context *ctx = sta_priv->ctx;
1272
1273 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1274 return -1;
1275
1276 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
1277 return -1;
1278
1279 /* Need both Tx chains/antennas to support MIMO */
1280 if (priv->hw_params.tx_chains_num < 2)
1281 return -1;
1282
1283 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1284
1285 tbl->lq_type = LQ_MIMO2;
1286 tbl->is_dup = lq_sta->is_dup;
1287 tbl->action = 0;
1288 tbl->max_search = IWL_MAX_SEARCH;
1289 rate_mask = lq_sta->active_mimo2_rate;
1290
1291 if (iwl_is_ht40_tx_allowed(priv, ctx, sta))
1292 tbl->is_ht40 = 1;
1293 else
1294 tbl->is_ht40 = 0;
1295
1296 rs_set_expected_tpt_table(lq_sta, tbl);
1297
1298 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1299
1300 IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1301 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1302 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1303 rate, rate_mask);
1304 return -1;
1305 }
1306 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1307
1308 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1309 tbl->current_rate, is_green);
1310 return 0;
1311 }
1312
1313 /*
1314 * Set up search table for MIMO3
1315 */
1316 static int rs_switch_to_mimo3(struct iwl_priv *priv,
1317 struct iwl_lq_sta *lq_sta,
1318 struct ieee80211_conf *conf,
1319 struct ieee80211_sta *sta,
1320 struct iwl_scale_tbl_info *tbl, int index)
1321 {
1322 u16 rate_mask;
1323 s32 rate;
1324 s8 is_green = lq_sta->is_green;
1325 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1326 struct iwl_rxon_context *ctx = sta_priv->ctx;
1327
1328 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1329 return -1;
1330
1331 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
1332 return -1;
1333
1334 /* Need both Tx chains/antennas to support MIMO */
1335 if (priv->hw_params.tx_chains_num < 3)
1336 return -1;
1337
1338 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1339
1340 tbl->lq_type = LQ_MIMO3;
1341 tbl->is_dup = lq_sta->is_dup;
1342 tbl->action = 0;
1343 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1344 rate_mask = lq_sta->active_mimo3_rate;
1345
1346 if (iwl_is_ht40_tx_allowed(priv, ctx, sta))
1347 tbl->is_ht40 = 1;
1348 else
1349 tbl->is_ht40 = 0;
1350
1351 rs_set_expected_tpt_table(lq_sta, tbl);
1352
1353 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1354
1355 IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1356 rate, rate_mask);
1357 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1358 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1359 rate, rate_mask);
1360 return -1;
1361 }
1362 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1363
1364 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1365 tbl->current_rate, is_green);
1366 return 0;
1367 }
1368
1369 /*
1370 * Set up search table for SISO
1371 */
1372 static int rs_switch_to_siso(struct iwl_priv *priv,
1373 struct iwl_lq_sta *lq_sta,
1374 struct ieee80211_conf *conf,
1375 struct ieee80211_sta *sta,
1376 struct iwl_scale_tbl_info *tbl, int index)
1377 {
1378 u16 rate_mask;
1379 u8 is_green = lq_sta->is_green;
1380 s32 rate;
1381 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1382 struct iwl_rxon_context *ctx = sta_priv->ctx;
1383
1384 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1385 return -1;
1386
1387 IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1388
1389 tbl->is_dup = lq_sta->is_dup;
1390 tbl->lq_type = LQ_SISO;
1391 tbl->action = 0;
1392 tbl->max_search = IWL_MAX_SEARCH;
1393 rate_mask = lq_sta->active_siso_rate;
1394
1395 if (iwl_is_ht40_tx_allowed(priv, ctx, sta))
1396 tbl->is_ht40 = 1;
1397 else
1398 tbl->is_ht40 = 0;
1399
1400 if (is_green)
1401 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1402
1403 rs_set_expected_tpt_table(lq_sta, tbl);
1404 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1405
1406 IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1407 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1408 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1409 rate, rate_mask);
1410 return -1;
1411 }
1412 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1413 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1414 tbl->current_rate, is_green);
1415 return 0;
1416 }
1417
1418 /*
1419 * Try to switch to new modulation mode from legacy
1420 */
1421 static int rs_move_legacy_other(struct iwl_priv *priv,
1422 struct iwl_lq_sta *lq_sta,
1423 struct ieee80211_conf *conf,
1424 struct ieee80211_sta *sta,
1425 int index)
1426 {
1427 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1428 struct iwl_scale_tbl_info *search_tbl =
1429 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1430 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1431 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1432 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1433 u8 start_action;
1434 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1435 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1436 int ret = 0;
1437 u8 update_search_tbl_counter = 0;
1438
1439 switch (priv->bt_traffic_load) {
1440 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1441 /* nothing */
1442 break;
1443 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1444 /* avoid antenna B unless MIMO */
1445 if (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2)
1446 tbl->action = IWL_LEGACY_SWITCH_SISO;
1447 break;
1448 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1449 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1450 /* avoid antenna B and MIMO */
1451 valid_tx_ant =
1452 first_antenna(priv->nvm_data->valid_tx_ant);
1453 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2 &&
1454 tbl->action != IWL_LEGACY_SWITCH_SISO)
1455 tbl->action = IWL_LEGACY_SWITCH_SISO;
1456 break;
1457 default:
1458 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1459 break;
1460 }
1461
1462 if (!iwl_ht_enabled(priv))
1463 /* stay in Legacy */
1464 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1465 else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1466 tbl->action > IWL_LEGACY_SWITCH_SISO)
1467 tbl->action = IWL_LEGACY_SWITCH_SISO;
1468
1469 /* configure as 1x1 if bt full concurrency */
1470 if (priv->bt_full_concurrent) {
1471 if (!iwl_ht_enabled(priv))
1472 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1473 else if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1474 tbl->action = IWL_LEGACY_SWITCH_SISO;
1475 valid_tx_ant =
1476 first_antenna(priv->nvm_data->valid_tx_ant);
1477 }
1478
1479 start_action = tbl->action;
1480 for (; ;) {
1481 lq_sta->action_counter++;
1482 switch (tbl->action) {
1483 case IWL_LEGACY_SWITCH_ANTENNA1:
1484 case IWL_LEGACY_SWITCH_ANTENNA2:
1485 IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1486
1487 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1488 tx_chains_num <= 1) ||
1489 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1490 tx_chains_num <= 2))
1491 break;
1492
1493 /* Don't change antenna if success has been great */
1494 if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1495 !priv->bt_full_concurrent &&
1496 priv->bt_traffic_load ==
1497 IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1498 break;
1499
1500 /* Set up search table to try other antenna */
1501 memcpy(search_tbl, tbl, sz);
1502
1503 if (rs_toggle_antenna(valid_tx_ant,
1504 &search_tbl->current_rate, search_tbl)) {
1505 update_search_tbl_counter = 1;
1506 rs_set_expected_tpt_table(lq_sta, search_tbl);
1507 goto out;
1508 }
1509 break;
1510 case IWL_LEGACY_SWITCH_SISO:
1511 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1512
1513 /* Set up search table to try SISO */
1514 memcpy(search_tbl, tbl, sz);
1515 search_tbl->is_SGI = 0;
1516 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1517 search_tbl, index);
1518 if (!ret) {
1519 lq_sta->action_counter = 0;
1520 goto out;
1521 }
1522
1523 break;
1524 case IWL_LEGACY_SWITCH_MIMO2_AB:
1525 case IWL_LEGACY_SWITCH_MIMO2_AC:
1526 case IWL_LEGACY_SWITCH_MIMO2_BC:
1527 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1528
1529 /* Set up search table to try MIMO */
1530 memcpy(search_tbl, tbl, sz);
1531 search_tbl->is_SGI = 0;
1532
1533 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1534 search_tbl->ant_type = ANT_AB;
1535 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1536 search_tbl->ant_type = ANT_AC;
1537 else
1538 search_tbl->ant_type = ANT_BC;
1539
1540 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1541 break;
1542
1543 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1544 search_tbl, index);
1545 if (!ret) {
1546 lq_sta->action_counter = 0;
1547 goto out;
1548 }
1549 break;
1550
1551 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1552 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1553
1554 /* Set up search table to try MIMO3 */
1555 memcpy(search_tbl, tbl, sz);
1556 search_tbl->is_SGI = 0;
1557
1558 search_tbl->ant_type = ANT_ABC;
1559
1560 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1561 break;
1562
1563 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1564 search_tbl, index);
1565 if (!ret) {
1566 lq_sta->action_counter = 0;
1567 goto out;
1568 }
1569 break;
1570 }
1571 tbl->action++;
1572 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1573 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1574
1575 if (tbl->action == start_action)
1576 break;
1577
1578 }
1579 search_tbl->lq_type = LQ_NONE;
1580 return 0;
1581
1582 out:
1583 lq_sta->search_better_tbl = 1;
1584 tbl->action++;
1585 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1586 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1587 if (update_search_tbl_counter)
1588 search_tbl->action = tbl->action;
1589 return 0;
1590
1591 }
1592
1593 /*
1594 * Try to switch to new modulation mode from SISO
1595 */
1596 static int rs_move_siso_to_other(struct iwl_priv *priv,
1597 struct iwl_lq_sta *lq_sta,
1598 struct ieee80211_conf *conf,
1599 struct ieee80211_sta *sta, int index)
1600 {
1601 u8 is_green = lq_sta->is_green;
1602 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1603 struct iwl_scale_tbl_info *search_tbl =
1604 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1605 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1606 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1607 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1608 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1609 u8 start_action;
1610 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1611 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1612 u8 update_search_tbl_counter = 0;
1613 int ret;
1614
1615 switch (priv->bt_traffic_load) {
1616 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1617 /* nothing */
1618 break;
1619 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1620 /* avoid antenna B unless MIMO */
1621 if (tbl->action == IWL_SISO_SWITCH_ANTENNA2)
1622 tbl->action = IWL_SISO_SWITCH_MIMO2_AB;
1623 break;
1624 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1625 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1626 /* avoid antenna B and MIMO */
1627 valid_tx_ant =
1628 first_antenna(priv->nvm_data->valid_tx_ant);
1629 if (tbl->action != IWL_SISO_SWITCH_ANTENNA1)
1630 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1631 break;
1632 default:
1633 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1634 break;
1635 }
1636
1637 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1638 tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1639 /* stay in SISO */
1640 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1641 }
1642
1643 /* configure as 1x1 if bt full concurrency */
1644 if (priv->bt_full_concurrent) {
1645 valid_tx_ant =
1646 first_antenna(priv->nvm_data->valid_tx_ant);
1647 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1648 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1649 }
1650
1651 start_action = tbl->action;
1652 for (;;) {
1653 lq_sta->action_counter++;
1654 switch (tbl->action) {
1655 case IWL_SISO_SWITCH_ANTENNA1:
1656 case IWL_SISO_SWITCH_ANTENNA2:
1657 IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1658 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1659 tx_chains_num <= 1) ||
1660 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1661 tx_chains_num <= 2))
1662 break;
1663
1664 if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1665 !priv->bt_full_concurrent &&
1666 priv->bt_traffic_load ==
1667 IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1668 break;
1669
1670 memcpy(search_tbl, tbl, sz);
1671 if (rs_toggle_antenna(valid_tx_ant,
1672 &search_tbl->current_rate, search_tbl)) {
1673 update_search_tbl_counter = 1;
1674 goto out;
1675 }
1676 break;
1677 case IWL_SISO_SWITCH_MIMO2_AB:
1678 case IWL_SISO_SWITCH_MIMO2_AC:
1679 case IWL_SISO_SWITCH_MIMO2_BC:
1680 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1681 memcpy(search_tbl, tbl, sz);
1682 search_tbl->is_SGI = 0;
1683
1684 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1685 search_tbl->ant_type = ANT_AB;
1686 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1687 search_tbl->ant_type = ANT_AC;
1688 else
1689 search_tbl->ant_type = ANT_BC;
1690
1691 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1692 break;
1693
1694 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1695 search_tbl, index);
1696 if (!ret)
1697 goto out;
1698 break;
1699 case IWL_SISO_SWITCH_GI:
1700 if (!tbl->is_ht40 && !(ht_cap->cap &
1701 IEEE80211_HT_CAP_SGI_20))
1702 break;
1703 if (tbl->is_ht40 && !(ht_cap->cap &
1704 IEEE80211_HT_CAP_SGI_40))
1705 break;
1706
1707 IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1708
1709 memcpy(search_tbl, tbl, sz);
1710 if (is_green) {
1711 if (!tbl->is_SGI)
1712 break;
1713 else
1714 IWL_ERR(priv,
1715 "SGI was set in GF+SISO\n");
1716 }
1717 search_tbl->is_SGI = !tbl->is_SGI;
1718 rs_set_expected_tpt_table(lq_sta, search_tbl);
1719 if (tbl->is_SGI) {
1720 s32 tpt = lq_sta->last_tpt / 100;
1721 if (tpt >= search_tbl->expected_tpt[index])
1722 break;
1723 }
1724 search_tbl->current_rate =
1725 rate_n_flags_from_tbl(priv, search_tbl,
1726 index, is_green);
1727 update_search_tbl_counter = 1;
1728 goto out;
1729 case IWL_SISO_SWITCH_MIMO3_ABC:
1730 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1731 memcpy(search_tbl, tbl, sz);
1732 search_tbl->is_SGI = 0;
1733 search_tbl->ant_type = ANT_ABC;
1734
1735 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1736 break;
1737
1738 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1739 search_tbl, index);
1740 if (!ret)
1741 goto out;
1742 break;
1743 }
1744 tbl->action++;
1745 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1746 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1747
1748 if (tbl->action == start_action)
1749 break;
1750 }
1751 search_tbl->lq_type = LQ_NONE;
1752 return 0;
1753
1754 out:
1755 lq_sta->search_better_tbl = 1;
1756 tbl->action++;
1757 if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1758 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1759 if (update_search_tbl_counter)
1760 search_tbl->action = tbl->action;
1761
1762 return 0;
1763 }
1764
1765 /*
1766 * Try to switch to new modulation mode from MIMO2
1767 */
1768 static int rs_move_mimo2_to_other(struct iwl_priv *priv,
1769 struct iwl_lq_sta *lq_sta,
1770 struct ieee80211_conf *conf,
1771 struct ieee80211_sta *sta, int index)
1772 {
1773 s8 is_green = lq_sta->is_green;
1774 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1775 struct iwl_scale_tbl_info *search_tbl =
1776 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1777 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1778 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1779 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1780 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1781 u8 start_action;
1782 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1783 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1784 u8 update_search_tbl_counter = 0;
1785 int ret;
1786
1787 switch (priv->bt_traffic_load) {
1788 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1789 /* nothing */
1790 break;
1791 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1792 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1793 /* avoid antenna B and MIMO */
1794 if (tbl->action != IWL_MIMO2_SWITCH_SISO_A)
1795 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1796 break;
1797 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1798 /* avoid antenna B unless MIMO */
1799 if (tbl->action == IWL_MIMO2_SWITCH_SISO_B ||
1800 tbl->action == IWL_MIMO2_SWITCH_SISO_C)
1801 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1802 break;
1803 default:
1804 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1805 break;
1806 }
1807
1808 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1809 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1810 tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1811 /* switch in SISO */
1812 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1813 }
1814
1815 /* configure as 1x1 if bt full concurrency */
1816 if (priv->bt_full_concurrent &&
1817 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1818 tbl->action > IWL_MIMO2_SWITCH_SISO_C))
1819 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1820
1821 start_action = tbl->action;
1822 for (;;) {
1823 lq_sta->action_counter++;
1824 switch (tbl->action) {
1825 case IWL_MIMO2_SWITCH_ANTENNA1:
1826 case IWL_MIMO2_SWITCH_ANTENNA2:
1827 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1828
1829 if (tx_chains_num <= 2)
1830 break;
1831
1832 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1833 break;
1834
1835 memcpy(search_tbl, tbl, sz);
1836 if (rs_toggle_antenna(valid_tx_ant,
1837 &search_tbl->current_rate, search_tbl)) {
1838 update_search_tbl_counter = 1;
1839 goto out;
1840 }
1841 break;
1842 case IWL_MIMO2_SWITCH_SISO_A:
1843 case IWL_MIMO2_SWITCH_SISO_B:
1844 case IWL_MIMO2_SWITCH_SISO_C:
1845 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1846
1847 /* Set up new search table for SISO */
1848 memcpy(search_tbl, tbl, sz);
1849
1850 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1851 search_tbl->ant_type = ANT_A;
1852 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1853 search_tbl->ant_type = ANT_B;
1854 else
1855 search_tbl->ant_type = ANT_C;
1856
1857 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1858 break;
1859
1860 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1861 search_tbl, index);
1862 if (!ret)
1863 goto out;
1864
1865 break;
1866
1867 case IWL_MIMO2_SWITCH_GI:
1868 if (!tbl->is_ht40 && !(ht_cap->cap &
1869 IEEE80211_HT_CAP_SGI_20))
1870 break;
1871 if (tbl->is_ht40 && !(ht_cap->cap &
1872 IEEE80211_HT_CAP_SGI_40))
1873 break;
1874
1875 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1876
1877 /* Set up new search table for MIMO2 */
1878 memcpy(search_tbl, tbl, sz);
1879 search_tbl->is_SGI = !tbl->is_SGI;
1880 rs_set_expected_tpt_table(lq_sta, search_tbl);
1881 /*
1882 * If active table already uses the fastest possible
1883 * modulation (dual stream with short guard interval),
1884 * and it's working well, there's no need to look
1885 * for a better type of modulation!
1886 */
1887 if (tbl->is_SGI) {
1888 s32 tpt = lq_sta->last_tpt / 100;
1889 if (tpt >= search_tbl->expected_tpt[index])
1890 break;
1891 }
1892 search_tbl->current_rate =
1893 rate_n_flags_from_tbl(priv, search_tbl,
1894 index, is_green);
1895 update_search_tbl_counter = 1;
1896 goto out;
1897
1898 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1899 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1900 memcpy(search_tbl, tbl, sz);
1901 search_tbl->is_SGI = 0;
1902 search_tbl->ant_type = ANT_ABC;
1903
1904 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1905 break;
1906
1907 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1908 search_tbl, index);
1909 if (!ret)
1910 goto out;
1911
1912 break;
1913 }
1914 tbl->action++;
1915 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1916 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1917
1918 if (tbl->action == start_action)
1919 break;
1920 }
1921 search_tbl->lq_type = LQ_NONE;
1922 return 0;
1923 out:
1924 lq_sta->search_better_tbl = 1;
1925 tbl->action++;
1926 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1927 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1928 if (update_search_tbl_counter)
1929 search_tbl->action = tbl->action;
1930
1931 return 0;
1932
1933 }
1934
1935 /*
1936 * Try to switch to new modulation mode from MIMO3
1937 */
1938 static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1939 struct iwl_lq_sta *lq_sta,
1940 struct ieee80211_conf *conf,
1941 struct ieee80211_sta *sta, int index)
1942 {
1943 s8 is_green = lq_sta->is_green;
1944 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1945 struct iwl_scale_tbl_info *search_tbl =
1946 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1947 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1948 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1949 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1950 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1951 u8 start_action;
1952 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1953 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1954 int ret;
1955 u8 update_search_tbl_counter = 0;
1956
1957 switch (priv->bt_traffic_load) {
1958 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1959 /* nothing */
1960 break;
1961 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1962 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1963 /* avoid antenna B and MIMO */
1964 if (tbl->action != IWL_MIMO3_SWITCH_SISO_A)
1965 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1966 break;
1967 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1968 /* avoid antenna B unless MIMO */
1969 if (tbl->action == IWL_MIMO3_SWITCH_SISO_B ||
1970 tbl->action == IWL_MIMO3_SWITCH_SISO_C)
1971 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1972 break;
1973 default:
1974 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1975 break;
1976 }
1977
1978 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1979 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1980 tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1981 /* switch in SISO */
1982 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1983 }
1984
1985 /* configure as 1x1 if bt full concurrency */
1986 if (priv->bt_full_concurrent &&
1987 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1988 tbl->action > IWL_MIMO3_SWITCH_SISO_C))
1989 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1990
1991 start_action = tbl->action;
1992 for (;;) {
1993 lq_sta->action_counter++;
1994 switch (tbl->action) {
1995 case IWL_MIMO3_SWITCH_ANTENNA1:
1996 case IWL_MIMO3_SWITCH_ANTENNA2:
1997 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
1998
1999 if (tx_chains_num <= 3)
2000 break;
2001
2002 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
2003 break;
2004
2005 memcpy(search_tbl, tbl, sz);
2006 if (rs_toggle_antenna(valid_tx_ant,
2007 &search_tbl->current_rate, search_tbl))
2008 goto out;
2009 break;
2010 case IWL_MIMO3_SWITCH_SISO_A:
2011 case IWL_MIMO3_SWITCH_SISO_B:
2012 case IWL_MIMO3_SWITCH_SISO_C:
2013 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
2014
2015 /* Set up new search table for SISO */
2016 memcpy(search_tbl, tbl, sz);
2017
2018 if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
2019 search_tbl->ant_type = ANT_A;
2020 else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
2021 search_tbl->ant_type = ANT_B;
2022 else
2023 search_tbl->ant_type = ANT_C;
2024
2025 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2026 break;
2027
2028 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
2029 search_tbl, index);
2030 if (!ret)
2031 goto out;
2032
2033 break;
2034
2035 case IWL_MIMO3_SWITCH_MIMO2_AB:
2036 case IWL_MIMO3_SWITCH_MIMO2_AC:
2037 case IWL_MIMO3_SWITCH_MIMO2_BC:
2038 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
2039
2040 memcpy(search_tbl, tbl, sz);
2041 search_tbl->is_SGI = 0;
2042 if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
2043 search_tbl->ant_type = ANT_AB;
2044 else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
2045 search_tbl->ant_type = ANT_AC;
2046 else
2047 search_tbl->ant_type = ANT_BC;
2048
2049 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2050 break;
2051
2052 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
2053 search_tbl, index);
2054 if (!ret)
2055 goto out;
2056
2057 break;
2058
2059 case IWL_MIMO3_SWITCH_GI:
2060 if (!tbl->is_ht40 && !(ht_cap->cap &
2061 IEEE80211_HT_CAP_SGI_20))
2062 break;
2063 if (tbl->is_ht40 && !(ht_cap->cap &
2064 IEEE80211_HT_CAP_SGI_40))
2065 break;
2066
2067 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
2068
2069 /* Set up new search table for MIMO */
2070 memcpy(search_tbl, tbl, sz);
2071 search_tbl->is_SGI = !tbl->is_SGI;
2072 rs_set_expected_tpt_table(lq_sta, search_tbl);
2073 /*
2074 * If active table already uses the fastest possible
2075 * modulation (dual stream with short guard interval),
2076 * and it's working well, there's no need to look
2077 * for a better type of modulation!
2078 */
2079 if (tbl->is_SGI) {
2080 s32 tpt = lq_sta->last_tpt / 100;
2081 if (tpt >= search_tbl->expected_tpt[index])
2082 break;
2083 }
2084 search_tbl->current_rate =
2085 rate_n_flags_from_tbl(priv, search_tbl,
2086 index, is_green);
2087 update_search_tbl_counter = 1;
2088 goto out;
2089 }
2090 tbl->action++;
2091 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2092 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2093
2094 if (tbl->action == start_action)
2095 break;
2096 }
2097 search_tbl->lq_type = LQ_NONE;
2098 return 0;
2099 out:
2100 lq_sta->search_better_tbl = 1;
2101 tbl->action++;
2102 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2103 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2104 if (update_search_tbl_counter)
2105 search_tbl->action = tbl->action;
2106
2107 return 0;
2108
2109 }
2110
2111 /*
2112 * Check whether we should continue using same modulation mode, or
2113 * begin search for a new mode, based on:
2114 * 1) # tx successes or failures while using this mode
2115 * 2) # times calling this function
2116 * 3) elapsed time in this mode (not used, for now)
2117 */
2118 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
2119 {
2120 struct iwl_scale_tbl_info *tbl;
2121 int i;
2122 int active_tbl;
2123 int flush_interval_passed = 0;
2124 struct iwl_priv *priv;
2125
2126 priv = lq_sta->drv;
2127 active_tbl = lq_sta->active_tbl;
2128
2129 tbl = &(lq_sta->lq_info[active_tbl]);
2130
2131 /* If we've been disallowing search, see if we should now allow it */
2132 if (lq_sta->stay_in_tbl) {
2133
2134 /* Elapsed time using current modulation mode */
2135 if (lq_sta->flush_timer)
2136 flush_interval_passed =
2137 time_after(jiffies,
2138 (unsigned long)(lq_sta->flush_timer +
2139 IWL_RATE_SCALE_FLUSH_INTVL));
2140
2141 /*
2142 * Check if we should allow search for new modulation mode.
2143 * If many frames have failed or succeeded, or we've used
2144 * this same modulation for a long time, allow search, and
2145 * reset history stats that keep track of whether we should
2146 * allow a new search. Also (below) reset all bitmaps and
2147 * stats in active history.
2148 */
2149 if (force_search ||
2150 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
2151 (lq_sta->total_success > lq_sta->max_success_limit) ||
2152 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
2153 && (flush_interval_passed))) {
2154 IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n",
2155 lq_sta->total_failed,
2156 lq_sta->total_success,
2157 flush_interval_passed);
2158
2159 /* Allow search for new mode */
2160 lq_sta->stay_in_tbl = 0; /* only place reset */
2161 lq_sta->total_failed = 0;
2162 lq_sta->total_success = 0;
2163 lq_sta->flush_timer = 0;
2164
2165 /*
2166 * Else if we've used this modulation mode enough repetitions
2167 * (regardless of elapsed time or success/failure), reset
2168 * history bitmaps and rate-specific stats for all rates in
2169 * active table.
2170 */
2171 } else {
2172 lq_sta->table_count++;
2173 if (lq_sta->table_count >=
2174 lq_sta->table_count_limit) {
2175 lq_sta->table_count = 0;
2176
2177 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
2178 for (i = 0; i < IWL_RATE_COUNT; i++)
2179 rs_rate_scale_clear_window(
2180 &(tbl->win[i]));
2181 }
2182 }
2183
2184 /* If transitioning to allow "search", reset all history
2185 * bitmaps and stats in active table (this will become the new
2186 * "search" table). */
2187 if (!lq_sta->stay_in_tbl) {
2188 for (i = 0; i < IWL_RATE_COUNT; i++)
2189 rs_rate_scale_clear_window(&(tbl->win[i]));
2190 }
2191 }
2192 }
2193
2194 /*
2195 * setup rate table in uCode
2196 */
2197 static void rs_update_rate_tbl(struct iwl_priv *priv,
2198 struct iwl_rxon_context *ctx,
2199 struct iwl_lq_sta *lq_sta,
2200 struct iwl_scale_tbl_info *tbl,
2201 int index, u8 is_green)
2202 {
2203 u32 rate;
2204
2205 /* Update uCode's rate table. */
2206 rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2207 rs_fill_link_cmd(priv, lq_sta, rate);
2208 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2209 }
2210
2211 /*
2212 * Do rate scaling and search for new modulation mode.
2213 */
2214 static void rs_rate_scale_perform(struct iwl_priv *priv,
2215 struct sk_buff *skb,
2216 struct ieee80211_sta *sta,
2217 struct iwl_lq_sta *lq_sta)
2218 {
2219 struct ieee80211_hw *hw = priv->hw;
2220 struct ieee80211_conf *conf = &hw->conf;
2221 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2222 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2223 int low = IWL_RATE_INVALID;
2224 int high = IWL_RATE_INVALID;
2225 int index;
2226 int i;
2227 struct iwl_rate_scale_data *window = NULL;
2228 int current_tpt = IWL_INVALID_VALUE;
2229 int low_tpt = IWL_INVALID_VALUE;
2230 int high_tpt = IWL_INVALID_VALUE;
2231 u32 fail_count;
2232 s8 scale_action = 0;
2233 u16 rate_mask;
2234 u8 update_lq = 0;
2235 struct iwl_scale_tbl_info *tbl, *tbl1;
2236 u16 rate_scale_index_msk = 0;
2237 u8 is_green = 0;
2238 u8 active_tbl = 0;
2239 u8 done_search = 0;
2240 u16 high_low;
2241 s32 sr;
2242 u8 tid = IWL_MAX_TID_COUNT;
2243 struct iwl_tid_data *tid_data;
2244 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
2245 struct iwl_rxon_context *ctx = sta_priv->ctx;
2246
2247 IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
2248
2249 /* Send management frames and NO_ACK data using lowest rate. */
2250 /* TODO: this could probably be improved.. */
2251 if (!ieee80211_is_data(hdr->frame_control) ||
2252 info->flags & IEEE80211_TX_CTL_NO_ACK)
2253 return;
2254
2255 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
2256
2257 tid = rs_tl_add_packet(lq_sta, hdr);
2258 if ((tid != IWL_MAX_TID_COUNT) &&
2259 (lq_sta->tx_agg_tid_en & (1 << tid))) {
2260 tid_data = &priv->tid_data[lq_sta->lq.sta_id][tid];
2261 if (tid_data->agg.state == IWL_AGG_OFF)
2262 lq_sta->is_agg = 0;
2263 else
2264 lq_sta->is_agg = 1;
2265 } else
2266 lq_sta->is_agg = 0;
2267
2268 /*
2269 * Select rate-scale / modulation-mode table to work with in
2270 * the rest of this function: "search" if searching for better
2271 * modulation mode, or "active" if doing rate scaling within a mode.
2272 */
2273 if (!lq_sta->search_better_tbl)
2274 active_tbl = lq_sta->active_tbl;
2275 else
2276 active_tbl = 1 - lq_sta->active_tbl;
2277
2278 tbl = &(lq_sta->lq_info[active_tbl]);
2279 if (is_legacy(tbl->lq_type))
2280 lq_sta->is_green = 0;
2281 else
2282 lq_sta->is_green = rs_use_green(sta);
2283 is_green = lq_sta->is_green;
2284
2285 /* current tx rate */
2286 index = lq_sta->last_txrate_idx;
2287
2288 IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2289 tbl->lq_type);
2290
2291 /* rates available for this association, and for modulation mode */
2292 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2293
2294 IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
2295
2296 /* mask with station rate restriction */
2297 if (is_legacy(tbl->lq_type)) {
2298 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2299 /* supp_rates has no CCK bits in A mode */
2300 rate_scale_index_msk = (u16) (rate_mask &
2301 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2302 else
2303 rate_scale_index_msk = (u16) (rate_mask &
2304 lq_sta->supp_rates);
2305
2306 } else
2307 rate_scale_index_msk = rate_mask;
2308
2309 if (!rate_scale_index_msk)
2310 rate_scale_index_msk = rate_mask;
2311
2312 if (!((1 << index) & rate_scale_index_msk)) {
2313 IWL_ERR(priv, "Current Rate is not valid\n");
2314 if (lq_sta->search_better_tbl) {
2315 /* revert to active table if search table is not valid*/
2316 tbl->lq_type = LQ_NONE;
2317 lq_sta->search_better_tbl = 0;
2318 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2319 /* get "active" rate info */
2320 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2321 rs_update_rate_tbl(priv, ctx, lq_sta, tbl,
2322 index, is_green);
2323 }
2324 return;
2325 }
2326
2327 /* Get expected throughput table and history window for current rate */
2328 if (!tbl->expected_tpt) {
2329 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2330 return;
2331 }
2332
2333 /* force user max rate if set by user */
2334 if ((lq_sta->max_rate_idx != -1) &&
2335 (lq_sta->max_rate_idx < index)) {
2336 index = lq_sta->max_rate_idx;
2337 update_lq = 1;
2338 window = &(tbl->win[index]);
2339 goto lq_update;
2340 }
2341
2342 window = &(tbl->win[index]);
2343
2344 /*
2345 * If there is not enough history to calculate actual average
2346 * throughput, keep analyzing results of more tx frames, without
2347 * changing rate or mode (bypass most of the rest of this function).
2348 * Set up new rate table in uCode only if old rate is not supported
2349 * in current association (use new rate found above).
2350 */
2351 fail_count = window->counter - window->success_counter;
2352 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2353 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2354 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2355 "for index %d\n",
2356 window->success_counter, window->counter, index);
2357
2358 /* Can't calculate this yet; not enough history */
2359 window->average_tpt = IWL_INVALID_VALUE;
2360
2361 /* Should we stay with this modulation mode,
2362 * or search for a new one? */
2363 rs_stay_in_table(lq_sta, false);
2364
2365 goto out;
2366 }
2367 /* Else we have enough samples; calculate estimate of
2368 * actual average throughput */
2369 if (window->average_tpt != ((window->success_ratio *
2370 tbl->expected_tpt[index] + 64) / 128)) {
2371 IWL_ERR(priv, "expected_tpt should have been calculated by now\n");
2372 window->average_tpt = ((window->success_ratio *
2373 tbl->expected_tpt[index] + 64) / 128);
2374 }
2375
2376 /* If we are searching for better modulation mode, check success. */
2377 if (lq_sta->search_better_tbl &&
2378 (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
2379 /* If good success, continue using the "search" mode;
2380 * no need to send new link quality command, since we're
2381 * continuing to use the setup that we've been trying. */
2382 if (window->average_tpt > lq_sta->last_tpt) {
2383
2384 IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2385 "suc=%d cur-tpt=%d old-tpt=%d\n",
2386 window->success_ratio,
2387 window->average_tpt,
2388 lq_sta->last_tpt);
2389
2390 if (!is_legacy(tbl->lq_type))
2391 lq_sta->enable_counter = 1;
2392
2393 /* Swap tables; "search" becomes "active" */
2394 lq_sta->active_tbl = active_tbl;
2395 current_tpt = window->average_tpt;
2396
2397 /* Else poor success; go back to mode in "active" table */
2398 } else {
2399
2400 IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2401 "suc=%d cur-tpt=%d old-tpt=%d\n",
2402 window->success_ratio,
2403 window->average_tpt,
2404 lq_sta->last_tpt);
2405
2406 /* Nullify "search" table */
2407 tbl->lq_type = LQ_NONE;
2408
2409 /* Revert to "active" table */
2410 active_tbl = lq_sta->active_tbl;
2411 tbl = &(lq_sta->lq_info[active_tbl]);
2412
2413 /* Revert to "active" rate and throughput info */
2414 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2415 current_tpt = lq_sta->last_tpt;
2416
2417 /* Need to set up a new rate table in uCode */
2418 update_lq = 1;
2419 }
2420
2421 /* Either way, we've made a decision; modulation mode
2422 * search is done, allow rate adjustment next time. */
2423 lq_sta->search_better_tbl = 0;
2424 done_search = 1; /* Don't switch modes below! */
2425 goto lq_update;
2426 }
2427
2428 /* (Else) not in search of better modulation mode, try for better
2429 * starting rate, while staying in this mode. */
2430 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2431 tbl->lq_type);
2432 low = high_low & 0xff;
2433 high = (high_low >> 8) & 0xff;
2434
2435 /* If user set max rate, dont allow higher than user constrain */
2436 if ((lq_sta->max_rate_idx != -1) &&
2437 (lq_sta->max_rate_idx < high))
2438 high = IWL_RATE_INVALID;
2439
2440 sr = window->success_ratio;
2441
2442 /* Collect measured throughputs for current and adjacent rates */
2443 current_tpt = window->average_tpt;
2444 if (low != IWL_RATE_INVALID)
2445 low_tpt = tbl->win[low].average_tpt;
2446 if (high != IWL_RATE_INVALID)
2447 high_tpt = tbl->win[high].average_tpt;
2448
2449 scale_action = 0;
2450
2451 /* Too many failures, decrease rate */
2452 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2453 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2454 scale_action = -1;
2455
2456 /* No throughput measured yet for adjacent rates; try increase. */
2457 } else if ((low_tpt == IWL_INVALID_VALUE) &&
2458 (high_tpt == IWL_INVALID_VALUE)) {
2459
2460 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2461 scale_action = 1;
2462 else if (low != IWL_RATE_INVALID)
2463 scale_action = 0;
2464 }
2465
2466 /* Both adjacent throughputs are measured, but neither one has better
2467 * throughput; we're using the best rate, don't change it! */
2468 else if ((low_tpt != IWL_INVALID_VALUE) &&
2469 (high_tpt != IWL_INVALID_VALUE) &&
2470 (low_tpt < current_tpt) &&
2471 (high_tpt < current_tpt))
2472 scale_action = 0;
2473
2474 /* At least one adjacent rate's throughput is measured,
2475 * and may have better performance. */
2476 else {
2477 /* Higher adjacent rate's throughput is measured */
2478 if (high_tpt != IWL_INVALID_VALUE) {
2479 /* Higher rate has better throughput */
2480 if (high_tpt > current_tpt &&
2481 sr >= IWL_RATE_INCREASE_TH) {
2482 scale_action = 1;
2483 } else {
2484 scale_action = 0;
2485 }
2486
2487 /* Lower adjacent rate's throughput is measured */
2488 } else if (low_tpt != IWL_INVALID_VALUE) {
2489 /* Lower rate has better throughput */
2490 if (low_tpt > current_tpt) {
2491 IWL_DEBUG_RATE(priv,
2492 "decrease rate because of low tpt\n");
2493 scale_action = -1;
2494 } else if (sr >= IWL_RATE_INCREASE_TH) {
2495 scale_action = 1;
2496 }
2497 }
2498 }
2499
2500 /* Sanity check; asked for decrease, but success rate or throughput
2501 * has been good at old rate. Don't change it. */
2502 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2503 ((sr > IWL_RATE_HIGH_TH) ||
2504 (current_tpt > (100 * tbl->expected_tpt[low]))))
2505 scale_action = 0;
2506 if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2507 scale_action = -1;
2508 if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
2509 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2510 scale_action = -1;
2511
2512 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2513 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2514 if (lq_sta->last_bt_traffic > priv->bt_traffic_load) {
2515 /*
2516 * don't set scale_action, don't want to scale up if
2517 * the rate scale doesn't otherwise think that is a
2518 * good idea.
2519 */
2520 } else if (lq_sta->last_bt_traffic <= priv->bt_traffic_load) {
2521 scale_action = -1;
2522 }
2523 }
2524 lq_sta->last_bt_traffic = priv->bt_traffic_load;
2525
2526 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2527 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2528 /* search for a new modulation */
2529 rs_stay_in_table(lq_sta, true);
2530 goto lq_update;
2531 }
2532
2533 switch (scale_action) {
2534 case -1:
2535 /* Decrease starting rate, update uCode's rate table */
2536 if (low != IWL_RATE_INVALID) {
2537 update_lq = 1;
2538 index = low;
2539 }
2540
2541 break;
2542 case 1:
2543 /* Increase starting rate, update uCode's rate table */
2544 if (high != IWL_RATE_INVALID) {
2545 update_lq = 1;
2546 index = high;
2547 }
2548
2549 break;
2550 case 0:
2551 /* No change */
2552 default:
2553 break;
2554 }
2555
2556 IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2557 "high %d type %d\n",
2558 index, scale_action, low, high, tbl->lq_type);
2559
2560 lq_update:
2561 /* Replace uCode's rate table for the destination station. */
2562 if (update_lq)
2563 rs_update_rate_tbl(priv, ctx, lq_sta, tbl, index, is_green);
2564
2565 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
2566 /* Should we stay with this modulation mode,
2567 * or search for a new one? */
2568 rs_stay_in_table(lq_sta, false);
2569 }
2570 /*
2571 * Search for new modulation mode if we're:
2572 * 1) Not changing rates right now
2573 * 2) Not just finishing up a search
2574 * 3) Allowing a new search
2575 */
2576 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2577 /* Save current throughput to compare with "search" throughput*/
2578 lq_sta->last_tpt = current_tpt;
2579
2580 /* Select a new "search" modulation mode to try.
2581 * If one is found, set up the new "search" table. */
2582 if (is_legacy(tbl->lq_type))
2583 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2584 else if (is_siso(tbl->lq_type))
2585 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2586 else if (is_mimo2(tbl->lq_type))
2587 rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2588 else
2589 rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2590
2591 /* If new "search" mode was selected, set up in uCode table */
2592 if (lq_sta->search_better_tbl) {
2593 /* Access the "search" table, clear its history. */
2594 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2595 for (i = 0; i < IWL_RATE_COUNT; i++)
2596 rs_rate_scale_clear_window(&(tbl->win[i]));
2597
2598 /* Use new "search" start rate */
2599 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2600
2601 IWL_DEBUG_RATE(priv, "Switch current mcs: %X index: %d\n",
2602 tbl->current_rate, index);
2603 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2604 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2605 } else
2606 done_search = 1;
2607 }
2608
2609 if (done_search && !lq_sta->stay_in_tbl) {
2610 /* If the "active" (non-search) mode was legacy,
2611 * and we've tried switching antennas,
2612 * but we haven't been able to try HT modes (not available),
2613 * stay with best antenna legacy modulation for a while
2614 * before next round of mode comparisons. */
2615 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2616 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2617 lq_sta->action_counter > tbl1->max_search) {
2618 IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2619 rs_set_stay_in_table(priv, 1, lq_sta);
2620 }
2621
2622 /* If we're in an HT mode, and all 3 mode switch actions
2623 * have been tried and compared, stay in this best modulation
2624 * mode for a while before next round of mode comparisons. */
2625 if (lq_sta->enable_counter &&
2626 (lq_sta->action_counter >= tbl1->max_search) &&
2627 iwl_ht_enabled(priv)) {
2628 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2629 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2630 (tid != IWL_MAX_TID_COUNT)) {
2631 u8 sta_id = lq_sta->lq.sta_id;
2632 tid_data = &priv->tid_data[sta_id][tid];
2633 if (tid_data->agg.state == IWL_AGG_OFF) {
2634 IWL_DEBUG_RATE(priv,
2635 "try to aggregate tid %d\n",
2636 tid);
2637 rs_tl_turn_on_agg(priv, tid,
2638 lq_sta, sta);
2639 }
2640 }
2641 rs_set_stay_in_table(priv, 0, lq_sta);
2642 }
2643 }
2644
2645 out:
2646 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2647 lq_sta->last_txrate_idx = index;
2648 }
2649
2650 /**
2651 * rs_initialize_lq - Initialize a station's hardware rate table
2652 *
2653 * The uCode's station table contains a table of fallback rates
2654 * for automatic fallback during transmission.
2655 *
2656 * NOTE: This sets up a default set of values. These will be replaced later
2657 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2658 * rc80211_simple.
2659 *
2660 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2661 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2662 * which requires station table entry to exist).
2663 */
2664 static void rs_initialize_lq(struct iwl_priv *priv,
2665 struct ieee80211_sta *sta,
2666 struct iwl_lq_sta *lq_sta)
2667 {
2668 struct iwl_scale_tbl_info *tbl;
2669 int rate_idx;
2670 int i;
2671 u32 rate;
2672 u8 use_green = rs_use_green(sta);
2673 u8 active_tbl = 0;
2674 u8 valid_tx_ant;
2675 struct iwl_station_priv *sta_priv;
2676 struct iwl_rxon_context *ctx;
2677
2678 if (!sta || !lq_sta)
2679 return;
2680
2681 sta_priv = (void *)sta->drv_priv;
2682 ctx = sta_priv->ctx;
2683
2684 i = lq_sta->last_txrate_idx;
2685
2686 valid_tx_ant = priv->nvm_data->valid_tx_ant;
2687
2688 if (!lq_sta->search_better_tbl)
2689 active_tbl = lq_sta->active_tbl;
2690 else
2691 active_tbl = 1 - lq_sta->active_tbl;
2692
2693 tbl = &(lq_sta->lq_info[active_tbl]);
2694
2695 if ((i < 0) || (i >= IWL_RATE_COUNT))
2696 i = 0;
2697
2698 rate = iwl_rates[i].plcp;
2699 tbl->ant_type = first_antenna(valid_tx_ant);
2700 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2701
2702 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2703 rate |= RATE_MCS_CCK_MSK;
2704
2705 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2706 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2707 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2708
2709 rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2710 tbl->current_rate = rate;
2711 rs_set_expected_tpt_table(lq_sta, tbl);
2712 rs_fill_link_cmd(NULL, lq_sta, rate);
2713 priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2714 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_SYNC, true);
2715 }
2716
2717 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2718 struct ieee80211_tx_rate_control *txrc)
2719 {
2720
2721 struct sk_buff *skb = txrc->skb;
2722 struct ieee80211_supported_band *sband = txrc->sband;
2723 struct iwl_op_mode *op_mode __maybe_unused =
2724 (struct iwl_op_mode *)priv_r;
2725 struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
2726 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2727 struct iwl_lq_sta *lq_sta = priv_sta;
2728 int rate_idx;
2729
2730 IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2731
2732 /* Get max rate if user set max rate */
2733 if (lq_sta) {
2734 lq_sta->max_rate_idx = txrc->max_rate_idx;
2735 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2736 (lq_sta->max_rate_idx != -1))
2737 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2738 if ((lq_sta->max_rate_idx < 0) ||
2739 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2740 lq_sta->max_rate_idx = -1;
2741 }
2742
2743 /* Treat uninitialized rate scaling data same as non-existing. */
2744 if (lq_sta && !lq_sta->drv) {
2745 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
2746 priv_sta = NULL;
2747 }
2748
2749 /* Send management frames and NO_ACK data using lowest rate. */
2750 if (rate_control_send_low(sta, priv_sta, txrc))
2751 return;
2752
2753 rate_idx = lq_sta->last_txrate_idx;
2754
2755 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2756 rate_idx -= IWL_FIRST_OFDM_RATE;
2757 /* 6M and 9M shared same MCS index */
2758 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2759 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2760 IWL_RATE_MIMO3_6M_PLCP)
2761 rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2762 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2763 IWL_RATE_MIMO2_6M_PLCP)
2764 rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2765 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2766 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2767 info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2768 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2769 info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
2770 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2771 info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2772 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2773 info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2774 } else {
2775 /* Check for invalid rates */
2776 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2777 ((sband->band == IEEE80211_BAND_5GHZ) &&
2778 (rate_idx < IWL_FIRST_OFDM_RATE)))
2779 rate_idx = rate_lowest_index(sband, sta);
2780 /* On valid 5 GHz rate, adjust index */
2781 else if (sband->band == IEEE80211_BAND_5GHZ)
2782 rate_idx -= IWL_FIRST_OFDM_RATE;
2783 info->control.rates[0].flags = 0;
2784 }
2785 info->control.rates[0].idx = rate_idx;
2786 info->control.rates[0].count = 1;
2787 }
2788
2789 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2790 gfp_t gfp)
2791 {
2792 struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2793 struct iwl_op_mode *op_mode __maybe_unused =
2794 (struct iwl_op_mode *)priv_rate;
2795 struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
2796
2797 IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2798
2799 return &sta_priv->lq_sta;
2800 }
2801
2802 /*
2803 * Called after adding a new station to initialize rate scaling
2804 */
2805 void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id)
2806 {
2807 int i, j;
2808 struct ieee80211_hw *hw = priv->hw;
2809 struct ieee80211_conf *conf = &priv->hw->conf;
2810 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2811 struct iwl_station_priv *sta_priv;
2812 struct iwl_lq_sta *lq_sta;
2813 struct ieee80211_supported_band *sband;
2814 unsigned long supp; /* must be unsigned long for for_each_set_bit */
2815
2816 sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2817 lq_sta = &sta_priv->lq_sta;
2818 sband = hw->wiphy->bands[conf->chandef.chan->band];
2819
2820
2821 lq_sta->lq.sta_id = sta_id;
2822
2823 for (j = 0; j < LQ_SIZE; j++)
2824 for (i = 0; i < IWL_RATE_COUNT; i++)
2825 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2826
2827 lq_sta->flush_timer = 0;
2828 lq_sta->supp_rates = sta->supp_rates[sband->band];
2829
2830 IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n",
2831 sta_id);
2832 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2833 * the lowest or the highest rate.. Could consider using RSSI from
2834 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2835 * after assoc.. */
2836
2837 lq_sta->is_dup = 0;
2838 lq_sta->max_rate_idx = -1;
2839 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2840 lq_sta->is_green = rs_use_green(sta);
2841 lq_sta->band = sband->band;
2842 /*
2843 * active legacy rates as per supported rates bitmap
2844 */
2845 supp = sta->supp_rates[sband->band];
2846 lq_sta->active_legacy_rate = 0;
2847 for_each_set_bit(i, &supp, BITS_PER_LONG)
2848 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2849
2850 /*
2851 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2852 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2853 */
2854 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2855 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2856 lq_sta->active_siso_rate &= ~((u16)0x2);
2857 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2858
2859 /* Same here */
2860 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2861 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2862 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2863 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2864
2865 lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2866 lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2867 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2868 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2869
2870 IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2871 lq_sta->active_siso_rate,
2872 lq_sta->active_mimo2_rate,
2873 lq_sta->active_mimo3_rate);
2874
2875 /* These values will be overridden later */
2876 lq_sta->lq.general_params.single_stream_ant_msk =
2877 first_antenna(priv->nvm_data->valid_tx_ant);
2878 lq_sta->lq.general_params.dual_stream_ant_msk =
2879 priv->nvm_data->valid_tx_ant &
2880 ~first_antenna(priv->nvm_data->valid_tx_ant);
2881 if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2882 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2883 } else if (num_of_ant(priv->nvm_data->valid_tx_ant) == 2) {
2884 lq_sta->lq.general_params.dual_stream_ant_msk =
2885 priv->nvm_data->valid_tx_ant;
2886 }
2887
2888 /* as default allow aggregation for all tids */
2889 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2890 lq_sta->drv = priv;
2891
2892 /* Set last_txrate_idx to lowest rate */
2893 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2894 if (sband->band == IEEE80211_BAND_5GHZ)
2895 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2896 lq_sta->is_agg = 0;
2897 #ifdef CONFIG_MAC80211_DEBUGFS
2898 lq_sta->dbg_fixed_rate = 0;
2899 #endif
2900
2901 rs_initialize_lq(priv, sta, lq_sta);
2902 }
2903
2904 static void rs_fill_link_cmd(struct iwl_priv *priv,
2905 struct iwl_lq_sta *lq_sta, u32 new_rate)
2906 {
2907 struct iwl_scale_tbl_info tbl_type;
2908 int index = 0;
2909 int rate_idx;
2910 int repeat_rate = 0;
2911 u8 ant_toggle_cnt = 0;
2912 u8 use_ht_possible = 1;
2913 u8 valid_tx_ant = 0;
2914 struct iwl_station_priv *sta_priv =
2915 container_of(lq_sta, struct iwl_station_priv, lq_sta);
2916 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2917
2918 /* Override starting rate (index 0) if needed for debug purposes */
2919 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2920
2921 /* Interpret new_rate (rate_n_flags) */
2922 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2923 &tbl_type, &rate_idx);
2924
2925 if (priv && priv->bt_full_concurrent) {
2926 /* 1x1 only */
2927 tbl_type.ant_type =
2928 first_antenna(priv->nvm_data->valid_tx_ant);
2929 }
2930
2931 /* How many times should we repeat the initial rate? */
2932 if (is_legacy(tbl_type.lq_type)) {
2933 ant_toggle_cnt = 1;
2934 repeat_rate = IWL_NUMBER_TRY;
2935 } else {
2936 repeat_rate = min(IWL_HT_NUMBER_TRY,
2937 LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2938 }
2939
2940 lq_cmd->general_params.mimo_delimiter =
2941 is_mimo(tbl_type.lq_type) ? 1 : 0;
2942
2943 /* Fill 1st table entry (index 0) */
2944 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2945
2946 if (num_of_ant(tbl_type.ant_type) == 1) {
2947 lq_cmd->general_params.single_stream_ant_msk =
2948 tbl_type.ant_type;
2949 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2950 lq_cmd->general_params.dual_stream_ant_msk =
2951 tbl_type.ant_type;
2952 } /* otherwise we don't modify the existing value */
2953
2954 index++;
2955 repeat_rate--;
2956 if (priv) {
2957 if (priv->bt_full_concurrent)
2958 valid_tx_ant = ANT_A;
2959 else
2960 valid_tx_ant = priv->nvm_data->valid_tx_ant;
2961 }
2962
2963 /* Fill rest of rate table */
2964 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2965 /* Repeat initial/next rate.
2966 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2967 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2968 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2969 if (is_legacy(tbl_type.lq_type)) {
2970 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2971 ant_toggle_cnt++;
2972 else if (priv &&
2973 rs_toggle_antenna(valid_tx_ant,
2974 &new_rate, &tbl_type))
2975 ant_toggle_cnt = 1;
2976 }
2977
2978 /* Override next rate if needed for debug purposes */
2979 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2980
2981 /* Fill next table entry */
2982 lq_cmd->rs_table[index].rate_n_flags =
2983 cpu_to_le32(new_rate);
2984 repeat_rate--;
2985 index++;
2986 }
2987
2988 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2989 &rate_idx);
2990
2991 if (priv && priv->bt_full_concurrent) {
2992 /* 1x1 only */
2993 tbl_type.ant_type =
2994 first_antenna(priv->nvm_data->valid_tx_ant);
2995 }
2996
2997 /* Indicate to uCode which entries might be MIMO.
2998 * If initial rate was MIMO, this will finally end up
2999 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
3000 if (is_mimo(tbl_type.lq_type))
3001 lq_cmd->general_params.mimo_delimiter = index;
3002
3003 /* Get next rate */
3004 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
3005 use_ht_possible);
3006
3007 /* How many times should we repeat the next rate? */
3008 if (is_legacy(tbl_type.lq_type)) {
3009 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
3010 ant_toggle_cnt++;
3011 else if (priv &&
3012 rs_toggle_antenna(valid_tx_ant,
3013 &new_rate, &tbl_type))
3014 ant_toggle_cnt = 1;
3015
3016 repeat_rate = IWL_NUMBER_TRY;
3017 } else {
3018 repeat_rate = IWL_HT_NUMBER_TRY;
3019 }
3020
3021 /* Don't allow HT rates after next pass.
3022 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
3023 use_ht_possible = 0;
3024
3025 /* Override next rate if needed for debug purposes */
3026 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
3027
3028 /* Fill next table entry */
3029 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
3030
3031 index++;
3032 repeat_rate--;
3033 }
3034
3035 lq_cmd->agg_params.agg_frame_cnt_limit =
3036 sta_priv->max_agg_bufsize ?: LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3037 lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
3038
3039 lq_cmd->agg_params.agg_time_limit =
3040 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
3041 /*
3042 * overwrite if needed, pass aggregation time limit
3043 * to uCode in uSec
3044 */
3045 if (priv && priv->lib->bt_params &&
3046 priv->lib->bt_params->agg_time_limit &&
3047 priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH)
3048 lq_cmd->agg_params.agg_time_limit =
3049 cpu_to_le16(priv->lib->bt_params->agg_time_limit);
3050 }
3051
3052 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3053 {
3054 return hw->priv;
3055 }
3056 /* rate scale requires free function to be implemented */
3057 static void rs_free(void *priv_rate)
3058 {
3059 return;
3060 }
3061
3062 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
3063 void *priv_sta)
3064 {
3065 struct iwl_op_mode *op_mode __maybe_unused = priv_r;
3066 struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
3067
3068 IWL_DEBUG_RATE(priv, "enter\n");
3069 IWL_DEBUG_RATE(priv, "leave\n");
3070 }
3071
3072 #ifdef CONFIG_MAC80211_DEBUGFS
3073 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
3074 u32 *rate_n_flags, int index)
3075 {
3076 struct iwl_priv *priv;
3077 u8 valid_tx_ant;
3078 u8 ant_sel_tx;
3079
3080 priv = lq_sta->drv;
3081 valid_tx_ant = priv->nvm_data->valid_tx_ant;
3082 if (lq_sta->dbg_fixed_rate) {
3083 ant_sel_tx =
3084 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
3085 >> RATE_MCS_ANT_POS);
3086 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
3087 *rate_n_flags = lq_sta->dbg_fixed_rate;
3088 IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
3089 } else {
3090 lq_sta->dbg_fixed_rate = 0;
3091 IWL_ERR(priv,
3092 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
3093 ant_sel_tx, valid_tx_ant);
3094 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3095 }
3096 } else {
3097 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3098 }
3099 }
3100
3101 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3102 const char __user *user_buf, size_t count, loff_t *ppos)
3103 {
3104 struct iwl_lq_sta *lq_sta = file->private_data;
3105 struct iwl_priv *priv;
3106 char buf[64];
3107 size_t buf_size;
3108 u32 parsed_rate;
3109
3110
3111 priv = lq_sta->drv;
3112 memset(buf, 0, sizeof(buf));
3113 buf_size = min(count, sizeof(buf) - 1);
3114 if (copy_from_user(buf, user_buf, buf_size))
3115 return -EFAULT;
3116
3117 if (sscanf(buf, "%x", &parsed_rate) == 1)
3118 lq_sta->dbg_fixed_rate = parsed_rate;
3119 else
3120 lq_sta->dbg_fixed_rate = 0;
3121
3122 rs_program_fix_rate(priv, lq_sta);
3123
3124 return count;
3125 }
3126
3127 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3128 char __user *user_buf, size_t count, loff_t *ppos)
3129 {
3130 char *buff;
3131 int desc = 0;
3132 int i = 0;
3133 int index = 0;
3134 ssize_t ret;
3135
3136 struct iwl_lq_sta *lq_sta = file->private_data;
3137 struct iwl_priv *priv;
3138 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3139
3140 priv = lq_sta->drv;
3141 buff = kmalloc(1024, GFP_KERNEL);
3142 if (!buff)
3143 return -ENOMEM;
3144
3145 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3146 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
3147 lq_sta->total_failed, lq_sta->total_success,
3148 lq_sta->active_legacy_rate);
3149 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3150 lq_sta->dbg_fixed_rate);
3151 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3152 (priv->nvm_data->valid_tx_ant & ANT_A) ? "ANT_A," : "",
3153 (priv->nvm_data->valid_tx_ant & ANT_B) ? "ANT_B," : "",
3154 (priv->nvm_data->valid_tx_ant & ANT_C) ? "ANT_C" : "");
3155 desc += sprintf(buff+desc, "lq type %s\n",
3156 (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
3157 if (is_Ht(tbl->lq_type)) {
3158 desc += sprintf(buff+desc, " %s",
3159 (is_siso(tbl->lq_type)) ? "SISO" :
3160 ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
3161 desc += sprintf(buff+desc, " %s",
3162 (tbl->is_ht40) ? "40MHz" : "20MHz");
3163 desc += sprintf(buff+desc, " %s %s %s\n", (tbl->is_SGI) ? "SGI" : "",
3164 (lq_sta->is_green) ? "GF enabled" : "",
3165 (lq_sta->is_agg) ? "AGG on" : "");
3166 }
3167 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3168 lq_sta->last_rate_n_flags);
3169 desc += sprintf(buff+desc, "general:"
3170 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
3171 lq_sta->lq.general_params.flags,
3172 lq_sta->lq.general_params.mimo_delimiter,
3173 lq_sta->lq.general_params.single_stream_ant_msk,
3174 lq_sta->lq.general_params.dual_stream_ant_msk);
3175
3176 desc += sprintf(buff+desc, "agg:"
3177 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3178 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
3179 lq_sta->lq.agg_params.agg_dis_start_th,
3180 lq_sta->lq.agg_params.agg_frame_cnt_limit);
3181
3182 desc += sprintf(buff+desc,
3183 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3184 lq_sta->lq.general_params.start_rate_index[0],
3185 lq_sta->lq.general_params.start_rate_index[1],
3186 lq_sta->lq.general_params.start_rate_index[2],
3187 lq_sta->lq.general_params.start_rate_index[3]);
3188
3189 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3190 index = iwl_hwrate_to_plcp_idx(
3191 le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
3192 if (is_legacy(tbl->lq_type)) {
3193 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
3194 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3195 iwl_rate_mcs[index].mbps);
3196 } else {
3197 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
3198 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3199 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
3200 }
3201 }
3202
3203 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3204 kfree(buff);
3205 return ret;
3206 }
3207
3208 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3209 .write = rs_sta_dbgfs_scale_table_write,
3210 .read = rs_sta_dbgfs_scale_table_read,
3211 .open = simple_open,
3212 .llseek = default_llseek,
3213 };
3214 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3215 char __user *user_buf, size_t count, loff_t *ppos)
3216 {
3217 char *buff;
3218 int desc = 0;
3219 int i, j;
3220 ssize_t ret;
3221
3222 struct iwl_lq_sta *lq_sta = file->private_data;
3223
3224 buff = kmalloc(1024, GFP_KERNEL);
3225 if (!buff)
3226 return -ENOMEM;
3227
3228 for (i = 0; i < LQ_SIZE; i++) {
3229 desc += sprintf(buff+desc,
3230 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
3231 "rate=0x%X\n",
3232 lq_sta->active_tbl == i ? "*" : "x",
3233 lq_sta->lq_info[i].lq_type,
3234 lq_sta->lq_info[i].is_SGI,
3235 lq_sta->lq_info[i].is_ht40,
3236 lq_sta->lq_info[i].is_dup,
3237 lq_sta->is_green,
3238 lq_sta->lq_info[i].current_rate);
3239 for (j = 0; j < IWL_RATE_COUNT; j++) {
3240 desc += sprintf(buff+desc,
3241 "counter=%d success=%d %%=%d\n",
3242 lq_sta->lq_info[i].win[j].counter,
3243 lq_sta->lq_info[i].win[j].success_counter,
3244 lq_sta->lq_info[i].win[j].success_ratio);
3245 }
3246 }
3247 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3248 kfree(buff);
3249 return ret;
3250 }
3251
3252 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3253 .read = rs_sta_dbgfs_stats_table_read,
3254 .open = simple_open,
3255 .llseek = default_llseek,
3256 };
3257
3258 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3259 char __user *user_buf, size_t count, loff_t *ppos)
3260 {
3261 struct iwl_lq_sta *lq_sta = file->private_data;
3262 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3263 char buff[120];
3264 int desc = 0;
3265
3266 if (is_Ht(tbl->lq_type))
3267 desc += sprintf(buff+desc,
3268 "Bit Rate= %d Mb/s\n",
3269 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3270 else
3271 desc += sprintf(buff+desc,
3272 "Bit Rate= %d Mb/s\n",
3273 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3274
3275 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
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 = simple_open,
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 cfg80211_chan_def *chandef,
3320 struct ieee80211_sta *sta, void *priv_sta)
3321 {
3322 }
3323 static struct rate_control_ops rs_ops = {
3324 .module = NULL,
3325 .name = RS_NAME,
3326 .tx_status = rs_tx_status,
3327 .get_rate = rs_get_rate,
3328 .rate_init = rs_rate_init_stub,
3329 .alloc = rs_alloc,
3330 .free = rs_free,
3331 .alloc_sta = rs_alloc_sta,
3332 .free_sta = rs_free_sta,
3333 #ifdef CONFIG_MAC80211_DEBUGFS
3334 .add_sta_debugfs = rs_add_debugfs,
3335 .remove_sta_debugfs = rs_remove_debugfs,
3336 #endif
3337 };
3338
3339 int iwlagn_rate_control_register(void)
3340 {
3341 return ieee80211_rate_control_register(&rs_ops);
3342 }
3343
3344 void iwlagn_rate_control_unregister(void)
3345 {
3346 ieee80211_rate_control_unregister(&rs_ops);
3347 }
3348
Linux with added FPC-III support