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[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / net / wireless / iwlwifi / iwl-agn-rs.c
1 /******************************************************************************
2 *
3 * Copyright(c) 2005 - 2011 Intel Corporation. All rights reserved.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2 of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
17 *
18 * The full GNU General Public License is included in this distribution in the
19 * file called LICENSE.
20 *
21 * Contact Information:
22 * Intel Linux Wireless <ilw@linux.intel.com>
23 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
24 *
25 *****************************************************************************/
26 #include <linux/kernel.h>
27 #include <linux/init.h>
28 #include <linux/skbuff.h>
29 #include <linux/slab.h>
30 #include <linux/wireless.h>
31 #include <net/mac80211.h>
32
33 #include <linux/netdevice.h>
34 #include <linux/etherdevice.h>
35 #include <linux/delay.h>
36
37 #include <linux/workqueue.h>
38
39 #include "iwl-dev.h"
40 #include "iwl-sta.h"
41 #include "iwl-core.h"
42 #include "iwl-agn.h"
43
44 #define RS_NAME "iwl-agn-rs"
45
46 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
47 #define IWL_NUMBER_TRY 1
48 #define IWL_HT_NUMBER_TRY 3
49
50 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
51 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
52 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
53
54 /* max allowed rate miss before sync LQ cmd */
55 #define IWL_MISSED_RATE_MAX 15
56 /* max time to accum history 2 seconds */
57 #define IWL_RATE_SCALE_FLUSH_INTVL (3*HZ)
58
59 static u8 rs_ht_to_legacy[] = {
60 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
61 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
62 IWL_RATE_6M_INDEX,
63 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
64 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
65 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
66 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
67 };
68
69 static const u8 ant_toggle_lookup[] = {
70 /*ANT_NONE -> */ ANT_NONE,
71 /*ANT_A -> */ ANT_B,
72 /*ANT_B -> */ ANT_C,
73 /*ANT_AB -> */ ANT_BC,
74 /*ANT_C -> */ ANT_A,
75 /*ANT_AC -> */ ANT_AB,
76 /*ANT_BC -> */ ANT_AC,
77 /*ANT_ABC -> */ ANT_ABC,
78 };
79
80 #define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np) \
81 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
82 IWL_RATE_SISO_##s##M_PLCP, \
83 IWL_RATE_MIMO2_##s##M_PLCP,\
84 IWL_RATE_MIMO3_##s##M_PLCP,\
85 IWL_RATE_##r##M_IEEE, \
86 IWL_RATE_##ip##M_INDEX, \
87 IWL_RATE_##in##M_INDEX, \
88 IWL_RATE_##rp##M_INDEX, \
89 IWL_RATE_##rn##M_INDEX, \
90 IWL_RATE_##pp##M_INDEX, \
91 IWL_RATE_##np##M_INDEX }
92
93 /*
94 * Parameter order:
95 * rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
96 *
97 * If there isn't a valid next or previous rate then INV is used which
98 * maps to IWL_RATE_INVALID
99 *
100 */
101 const struct iwl_rate_info iwl_rates[IWL_RATE_COUNT] = {
102 IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2), /* 1mbps */
103 IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5), /* 2mbps */
104 IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11), /*5.5mbps */
105 IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18), /* 11mbps */
106 IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11), /* 6mbps */
107 IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11), /* 9mbps */
108 IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18), /* 12mbps */
109 IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24), /* 18mbps */
110 IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36), /* 24mbps */
111 IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48), /* 36mbps */
112 IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54), /* 48mbps */
113 IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
114 IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
115 /* FIXME:RS: ^^ should be INV (legacy) */
116 };
117
118 static inline u8 rs_extract_rate(u32 rate_n_flags)
119 {
120 return (u8)(rate_n_flags & RATE_MCS_RATE_MSK);
121 }
122
123 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
124 {
125 int idx = 0;
126
127 /* HT rate format */
128 if (rate_n_flags & RATE_MCS_HT_MSK) {
129 idx = rs_extract_rate(rate_n_flags);
130
131 if (idx >= IWL_RATE_MIMO3_6M_PLCP)
132 idx = idx - IWL_RATE_MIMO3_6M_PLCP;
133 else if (idx >= IWL_RATE_MIMO2_6M_PLCP)
134 idx = idx - IWL_RATE_MIMO2_6M_PLCP;
135
136 idx += IWL_FIRST_OFDM_RATE;
137 /* skip 9M not supported in ht*/
138 if (idx >= IWL_RATE_9M_INDEX)
139 idx += 1;
140 if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE))
141 return idx;
142
143 /* legacy rate format, search for match in table */
144 } else {
145 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
146 if (iwl_rates[idx].plcp ==
147 rs_extract_rate(rate_n_flags))
148 return idx;
149 }
150
151 return -1;
152 }
153
154 static void rs_rate_scale_perform(struct iwl_priv *priv,
155 struct sk_buff *skb,
156 struct ieee80211_sta *sta,
157 struct iwl_lq_sta *lq_sta);
158 static void rs_fill_link_cmd(struct iwl_priv *priv,
159 struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
160 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
161
162
163 #ifdef CONFIG_MAC80211_DEBUGFS
164 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
165 u32 *rate_n_flags, int index);
166 #else
167 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
168 u32 *rate_n_flags, int index)
169 {}
170 #endif
171
172 /**
173 * The following tables contain the expected throughput metrics for all rates
174 *
175 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
176 *
177 * where invalid entries are zeros.
178 *
179 * CCK rates are only valid in legacy table and will only be used in G
180 * (2.4 GHz) band.
181 */
182
183 static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
184 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
185 };
186
187 static s32 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
188 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202}, /* Norm */
189 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210}, /* SGI */
190 {0, 0, 0, 0, 47, 0, 91, 133, 171, 242, 305, 334, 362}, /* AGG */
191 {0, 0, 0, 0, 52, 0, 101, 145, 187, 264, 330, 361, 390}, /* AGG+SGI */
192 };
193
194 static s32 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
195 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
196 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
197 {0, 0, 0, 0, 94, 0, 177, 249, 313, 423, 512, 550, 586}, /* AGG */
198 {0, 0, 0, 0, 104, 0, 193, 270, 338, 454, 545, 584, 620}, /* AGG+SGI */
199 };
200
201 static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
202 {0, 0, 0, 0, 74, 0, 123, 155, 179, 214, 236, 244, 251}, /* Norm */
203 {0, 0, 0, 0, 81, 0, 131, 164, 188, 223, 243, 251, 257}, /* SGI */
204 {0, 0, 0, 0, 89, 0, 167, 235, 296, 402, 488, 526, 560}, /* AGG */
205 {0, 0, 0, 0, 97, 0, 182, 255, 320, 431, 520, 558, 593}, /* AGG+SGI*/
206 };
207
208 static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
209 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
210 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
211 {0, 0, 0, 0, 171, 0, 305, 410, 496, 634, 731, 771, 805}, /* AGG */
212 {0, 0, 0, 0, 186, 0, 329, 439, 527, 667, 764, 803, 838}, /* AGG+SGI */
213 };
214
215 static s32 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = {
216 {0, 0, 0, 0, 99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */
217 {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */
218 {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */
219 {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */
220 };
221
222 static s32 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = {
223 {0, 0, 0, 0, 152, 0, 211, 239, 255, 279, 290, 294, 297}, /* Norm */
224 {0, 0, 0, 0, 160, 0, 219, 245, 261, 284, 294, 297, 300}, /* SGI */
225 {0, 0, 0, 0, 254, 0, 443, 584, 695, 868, 984, 1030, 1070}, /* AGG */
226 {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */
227 };
228
229 /* mbps, mcs */
230 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
231 { "1", "BPSK DSSS"},
232 { "2", "QPSK DSSS"},
233 {"5.5", "BPSK CCK"},
234 { "11", "QPSK CCK"},
235 { "6", "BPSK 1/2"},
236 { "9", "BPSK 1/2"},
237 { "12", "QPSK 1/2"},
238 { "18", "QPSK 3/4"},
239 { "24", "16QAM 1/2"},
240 { "36", "16QAM 3/4"},
241 { "48", "64QAM 2/3"},
242 { "54", "64QAM 3/4"},
243 { "60", "64QAM 5/6"},
244 };
245
246 #define MCS_INDEX_PER_STREAM (8)
247
248 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
249 {
250 window->data = 0;
251 window->success_counter = 0;
252 window->success_ratio = IWL_INVALID_VALUE;
253 window->counter = 0;
254 window->average_tpt = IWL_INVALID_VALUE;
255 window->stamp = 0;
256 }
257
258 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
259 {
260 return (ant_type & valid_antenna) == ant_type;
261 }
262
263 /*
264 * removes the old data from the statistics. All data that is older than
265 * TID_MAX_TIME_DIFF, will be deleted.
266 */
267 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
268 {
269 /* The oldest age we want to keep */
270 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
271
272 while (tl->queue_count &&
273 (tl->time_stamp < oldest_time)) {
274 tl->total -= tl->packet_count[tl->head];
275 tl->packet_count[tl->head] = 0;
276 tl->time_stamp += TID_QUEUE_CELL_SPACING;
277 tl->queue_count--;
278 tl->head++;
279 if (tl->head >= TID_QUEUE_MAX_SIZE)
280 tl->head = 0;
281 }
282 }
283
284 /*
285 * increment traffic load value for tid and also remove
286 * any old values if passed the certain time period
287 */
288 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
289 struct ieee80211_hdr *hdr)
290 {
291 u32 curr_time = jiffies_to_msecs(jiffies);
292 u32 time_diff;
293 s32 index;
294 struct iwl_traffic_load *tl = NULL;
295 u8 tid;
296
297 if (ieee80211_is_data_qos(hdr->frame_control)) {
298 u8 *qc = ieee80211_get_qos_ctl(hdr);
299 tid = qc[0] & 0xf;
300 } else
301 return MAX_TID_COUNT;
302
303 if (unlikely(tid >= TID_MAX_LOAD_COUNT))
304 return MAX_TID_COUNT;
305
306 tl = &lq_data->load[tid];
307
308 curr_time -= curr_time % TID_ROUND_VALUE;
309
310 /* Happens only for the first packet. Initialize the data */
311 if (!(tl->queue_count)) {
312 tl->total = 1;
313 tl->time_stamp = curr_time;
314 tl->queue_count = 1;
315 tl->head = 0;
316 tl->packet_count[0] = 1;
317 return MAX_TID_COUNT;
318 }
319
320 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
321 index = time_diff / TID_QUEUE_CELL_SPACING;
322
323 /* The history is too long: remove data that is older than */
324 /* TID_MAX_TIME_DIFF */
325 if (index >= TID_QUEUE_MAX_SIZE)
326 rs_tl_rm_old_stats(tl, curr_time);
327
328 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
329 tl->packet_count[index] = tl->packet_count[index] + 1;
330 tl->total = tl->total + 1;
331
332 if ((index + 1) > tl->queue_count)
333 tl->queue_count = index + 1;
334
335 return tid;
336 }
337
338 #ifdef CONFIG_MAC80211_DEBUGFS
339 static void rs_program_fix_rate(struct iwl_priv *priv,
340 struct iwl_lq_sta *lq_sta)
341 {
342 struct iwl_station_priv *sta_priv =
343 container_of(lq_sta, struct iwl_station_priv, lq_sta);
344 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
345
346 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
347 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
348 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
349 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
350
351 lq_sta->dbg_fixed_rate = priv->dbg_fixed_rate;
352
353 IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
354 lq_sta->lq.sta_id, priv->dbg_fixed_rate);
355
356 if (priv->dbg_fixed_rate) {
357 rs_fill_link_cmd(NULL, lq_sta, priv->dbg_fixed_rate);
358 iwl_send_lq_cmd(lq_sta->drv, ctx, &lq_sta->lq, CMD_ASYNC,
359 false);
360 }
361 }
362 #endif
363
364 /*
365 get the traffic load value for tid
366 */
367 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
368 {
369 u32 curr_time = jiffies_to_msecs(jiffies);
370 u32 time_diff;
371 s32 index;
372 struct iwl_traffic_load *tl = NULL;
373
374 if (tid >= TID_MAX_LOAD_COUNT)
375 return 0;
376
377 tl = &(lq_data->load[tid]);
378
379 curr_time -= curr_time % TID_ROUND_VALUE;
380
381 if (!(tl->queue_count))
382 return 0;
383
384 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
385 index = time_diff / TID_QUEUE_CELL_SPACING;
386
387 /* The history is too long: remove data that is older than */
388 /* TID_MAX_TIME_DIFF */
389 if (index >= TID_QUEUE_MAX_SIZE)
390 rs_tl_rm_old_stats(tl, curr_time);
391
392 return tl->total;
393 }
394
395 static int rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
396 struct iwl_lq_sta *lq_data, u8 tid,
397 struct ieee80211_sta *sta)
398 {
399 int ret = -EAGAIN;
400 u32 load;
401
402 /*
403 * Don't create TX aggregation sessions when in high
404 * BT traffic, as they would just be disrupted by BT.
405 */
406 if (priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) {
407 IWL_ERR(priv, "BT traffic (%d), no aggregation allowed\n",
408 priv->bt_traffic_load);
409 return ret;
410 }
411
412 load = rs_tl_get_load(lq_data, tid);
413
414 if (load > IWL_AGG_LOAD_THRESHOLD) {
415 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
416 sta->addr, tid);
417 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
418 if (ret == -EAGAIN) {
419 /*
420 * driver and mac80211 is out of sync
421 * this might be cause by reloading firmware
422 * stop the tx ba session here
423 */
424 IWL_ERR(priv, "Fail start Tx agg on tid: %d\n",
425 tid);
426 ieee80211_stop_tx_ba_session(sta, tid);
427 }
428 } else {
429 IWL_ERR(priv, "Aggregation not enabled for tid %d "
430 "because load = %u\n", tid, load);
431 }
432 return ret;
433 }
434
435 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
436 struct iwl_lq_sta *lq_data,
437 struct ieee80211_sta *sta)
438 {
439 if (tid < TID_MAX_LOAD_COUNT)
440 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
441 else
442 IWL_ERR(priv, "tid exceeds max load count: %d/%d\n",
443 tid, TID_MAX_LOAD_COUNT);
444 }
445
446 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
447 {
448 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
449 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
450 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
451 }
452
453 /*
454 * Static function to get the expected throughput from an iwl_scale_tbl_info
455 * that wraps a NULL pointer check
456 */
457 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
458 {
459 if (tbl->expected_tpt)
460 return tbl->expected_tpt[rs_index];
461 return 0;
462 }
463
464 /**
465 * rs_collect_tx_data - Update the success/failure sliding window
466 *
467 * We keep a sliding window of the last 62 packets transmitted
468 * at this rate. window->data contains the bitmask of successful
469 * packets.
470 */
471 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
472 int scale_index, int attempts, int successes)
473 {
474 struct iwl_rate_scale_data *window = NULL;
475 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
476 s32 fail_count, tpt;
477
478 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
479 return -EINVAL;
480
481 /* Select window for current tx bit rate */
482 window = &(tbl->win[scale_index]);
483
484 /* Get expected throughput */
485 tpt = get_expected_tpt(tbl, scale_index);
486
487 /*
488 * Keep track of only the latest 62 tx frame attempts in this rate's
489 * history window; anything older isn't really relevant any more.
490 * If we have filled up the sliding window, drop the oldest attempt;
491 * if the oldest attempt (highest bit in bitmap) shows "success",
492 * subtract "1" from the success counter (this is the main reason
493 * we keep these bitmaps!).
494 */
495 while (attempts > 0) {
496 if (window->counter >= IWL_RATE_MAX_WINDOW) {
497
498 /* remove earliest */
499 window->counter = IWL_RATE_MAX_WINDOW - 1;
500
501 if (window->data & mask) {
502 window->data &= ~mask;
503 window->success_counter--;
504 }
505 }
506
507 /* Increment frames-attempted counter */
508 window->counter++;
509
510 /* Shift bitmap by one frame to throw away oldest history */
511 window->data <<= 1;
512
513 /* Mark the most recent #successes attempts as successful */
514 if (successes > 0) {
515 window->success_counter++;
516 window->data |= 0x1;
517 successes--;
518 }
519
520 attempts--;
521 }
522
523 /* Calculate current success ratio, avoid divide-by-0! */
524 if (window->counter > 0)
525 window->success_ratio = 128 * (100 * window->success_counter)
526 / window->counter;
527 else
528 window->success_ratio = IWL_INVALID_VALUE;
529
530 fail_count = window->counter - window->success_counter;
531
532 /* Calculate average throughput, if we have enough history. */
533 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
534 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
535 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
536 else
537 window->average_tpt = IWL_INVALID_VALUE;
538
539 /* Tag this window as having been updated */
540 window->stamp = jiffies;
541
542 return 0;
543 }
544
545 /*
546 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
547 */
548 /* FIXME:RS:remove this function and put the flags statically in the table */
549 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
550 struct iwl_scale_tbl_info *tbl,
551 int index, u8 use_green)
552 {
553 u32 rate_n_flags = 0;
554
555 if (is_legacy(tbl->lq_type)) {
556 rate_n_flags = iwl_rates[index].plcp;
557 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
558 rate_n_flags |= RATE_MCS_CCK_MSK;
559
560 } else if (is_Ht(tbl->lq_type)) {
561 if (index > IWL_LAST_OFDM_RATE) {
562 IWL_ERR(priv, "Invalid HT rate index %d\n", index);
563 index = IWL_LAST_OFDM_RATE;
564 }
565 rate_n_flags = RATE_MCS_HT_MSK;
566
567 if (is_siso(tbl->lq_type))
568 rate_n_flags |= iwl_rates[index].plcp_siso;
569 else if (is_mimo2(tbl->lq_type))
570 rate_n_flags |= iwl_rates[index].plcp_mimo2;
571 else
572 rate_n_flags |= iwl_rates[index].plcp_mimo3;
573 } else {
574 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
575 }
576
577 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
578 RATE_MCS_ANT_ABC_MSK);
579
580 if (is_Ht(tbl->lq_type)) {
581 if (tbl->is_ht40) {
582 if (tbl->is_dup)
583 rate_n_flags |= RATE_MCS_DUP_MSK;
584 else
585 rate_n_flags |= RATE_MCS_HT40_MSK;
586 }
587 if (tbl->is_SGI)
588 rate_n_flags |= RATE_MCS_SGI_MSK;
589
590 if (use_green) {
591 rate_n_flags |= RATE_MCS_GF_MSK;
592 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
593 rate_n_flags &= ~RATE_MCS_SGI_MSK;
594 IWL_ERR(priv, "GF was set with SGI:SISO\n");
595 }
596 }
597 }
598 return rate_n_flags;
599 }
600
601 /*
602 * Interpret uCode API's rate_n_flags format,
603 * fill "search" or "active" tx mode table.
604 */
605 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
606 enum ieee80211_band band,
607 struct iwl_scale_tbl_info *tbl,
608 int *rate_idx)
609 {
610 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
611 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
612 u8 mcs;
613
614 memset(tbl, 0, sizeof(struct iwl_scale_tbl_info));
615 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
616
617 if (*rate_idx == IWL_RATE_INVALID) {
618 *rate_idx = -1;
619 return -EINVAL;
620 }
621 tbl->is_SGI = 0; /* default legacy setup */
622 tbl->is_ht40 = 0;
623 tbl->is_dup = 0;
624 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
625 tbl->lq_type = LQ_NONE;
626 tbl->max_search = IWL_MAX_SEARCH;
627
628 /* legacy rate format */
629 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
630 if (num_of_ant == 1) {
631 if (band == IEEE80211_BAND_5GHZ)
632 tbl->lq_type = LQ_A;
633 else
634 tbl->lq_type = LQ_G;
635 }
636 /* HT rate format */
637 } else {
638 if (rate_n_flags & RATE_MCS_SGI_MSK)
639 tbl->is_SGI = 1;
640
641 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
642 (rate_n_flags & RATE_MCS_DUP_MSK))
643 tbl->is_ht40 = 1;
644
645 if (rate_n_flags & RATE_MCS_DUP_MSK)
646 tbl->is_dup = 1;
647
648 mcs = rs_extract_rate(rate_n_flags);
649
650 /* SISO */
651 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
652 if (num_of_ant == 1)
653 tbl->lq_type = LQ_SISO; /*else NONE*/
654 /* MIMO2 */
655 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
656 if (num_of_ant == 2)
657 tbl->lq_type = LQ_MIMO2;
658 /* MIMO3 */
659 } else {
660 if (num_of_ant == 3) {
661 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
662 tbl->lq_type = LQ_MIMO3;
663 }
664 }
665 }
666 return 0;
667 }
668
669 /* switch to another antenna/antennas and return 1 */
670 /* if no other valid antenna found, return 0 */
671 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
672 struct iwl_scale_tbl_info *tbl)
673 {
674 u8 new_ant_type;
675
676 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
677 return 0;
678
679 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
680 return 0;
681
682 new_ant_type = ant_toggle_lookup[tbl->ant_type];
683
684 while ((new_ant_type != tbl->ant_type) &&
685 !rs_is_valid_ant(valid_ant, new_ant_type))
686 new_ant_type = ant_toggle_lookup[new_ant_type];
687
688 if (new_ant_type == tbl->ant_type)
689 return 0;
690
691 tbl->ant_type = new_ant_type;
692 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
693 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
694 return 1;
695 }
696
697 /**
698 * Green-field mode is valid if the station supports it and
699 * there are no non-GF stations present in the BSS.
700 */
701 static bool rs_use_green(struct ieee80211_sta *sta)
702 {
703 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
704 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
705
706 return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
707 !(ctx->ht.non_gf_sta_present);
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->hw_params.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 unsigned long flags;
865
866 if (priv->bt_ant_couple_ok) {
867 /*
868 * Is there a need to switch between
869 * full concurrency and 3-wire?
870 */
871 spin_lock_irqsave(&priv->lock, flags);
872 if (priv->bt_ci_compliance && priv->bt_ant_couple_ok)
873 full_concurrent = true;
874 else
875 full_concurrent = false;
876 spin_unlock_irqrestore(&priv->lock, flags);
877 }
878 if ((priv->bt_traffic_load != priv->last_bt_traffic_load) ||
879 (priv->bt_full_concurrent != full_concurrent)) {
880 priv->bt_full_concurrent = full_concurrent;
881
882 /* Update uCode's rate table. */
883 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
884 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
885 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
886
887 queue_work(priv->workqueue, &priv->bt_full_concurrency);
888 }
889 }
890
891 /*
892 * mac80211 sends us Tx status
893 */
894 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
895 struct ieee80211_sta *sta, void *priv_sta,
896 struct sk_buff *skb)
897 {
898 int legacy_success;
899 int retries;
900 int rs_index, mac_index, i;
901 struct iwl_lq_sta *lq_sta = priv_sta;
902 struct iwl_link_quality_cmd *table;
903 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
904 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
905 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
906 enum mac80211_rate_control_flags mac_flags;
907 u32 tx_rate;
908 struct iwl_scale_tbl_info tbl_type;
909 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
910 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
911 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
912
913 IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
914
915 /* Treat uninitialized rate scaling data same as non-existing. */
916 if (!lq_sta) {
917 IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n");
918 return;
919 } else if (!lq_sta->drv) {
920 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
921 return;
922 }
923
924 if (!ieee80211_is_data(hdr->frame_control) ||
925 info->flags & IEEE80211_TX_CTL_NO_ACK)
926 return;
927
928 /* This packet was aggregated but doesn't carry status info */
929 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
930 !(info->flags & IEEE80211_TX_STAT_AMPDU))
931 return;
932
933 /*
934 * Ignore this Tx frame response if its initial rate doesn't match
935 * that of latest Link Quality command. There may be stragglers
936 * from a previous Link Quality command, but we're no longer interested
937 * in those; they're either from the "active" mode while we're trying
938 * to check "search" mode, or a prior "search" mode after we've moved
939 * to a new "search" mode (which might become the new "active" mode).
940 */
941 table = &lq_sta->lq;
942 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
943 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
944 if (priv->band == IEEE80211_BAND_5GHZ)
945 rs_index -= IWL_FIRST_OFDM_RATE;
946 mac_flags = info->status.rates[0].flags;
947 mac_index = info->status.rates[0].idx;
948 /* For HT packets, map MCS to PLCP */
949 if (mac_flags & IEEE80211_TX_RC_MCS) {
950 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
951 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
952 mac_index++;
953 /*
954 * mac80211 HT index is always zero-indexed; we need to move
955 * HT OFDM rates after CCK rates in 2.4 GHz band
956 */
957 if (priv->band == IEEE80211_BAND_2GHZ)
958 mac_index += IWL_FIRST_OFDM_RATE;
959 }
960 /* Here we actually compare this rate to the latest LQ command */
961 if ((mac_index < 0) ||
962 (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
963 (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
964 (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
965 (tbl_type.ant_type != info->antenna_sel_tx) ||
966 (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
967 (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
968 (rs_index != mac_index)) {
969 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate);
970 /*
971 * Since rates mis-match, the last LQ command may have failed.
972 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
973 * ... driver.
974 */
975 lq_sta->missed_rate_counter++;
976 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
977 lq_sta->missed_rate_counter = 0;
978 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
979 }
980 /* Regardless, ignore this status info for outdated rate */
981 return;
982 } else
983 /* Rate did match, so reset the missed_rate_counter */
984 lq_sta->missed_rate_counter = 0;
985
986 /* Figure out if rate scale algorithm is in active or search table */
987 if (table_type_matches(&tbl_type,
988 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
989 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
990 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
991 } else if (table_type_matches(&tbl_type,
992 &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
993 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
994 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
995 } else {
996 IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n");
997 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
998 IWL_DEBUG_RATE(priv, "active- lq:%x, ant:%x, SGI:%d\n",
999 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
1000 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1001 IWL_DEBUG_RATE(priv, "search- lq:%x, ant:%x, SGI:%d\n",
1002 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
1003 IWL_DEBUG_RATE(priv, "actual- lq:%x, ant:%x, SGI:%d\n",
1004 tbl_type.lq_type, tbl_type.ant_type, tbl_type.is_SGI);
1005 /*
1006 * no matching table found, let's by-pass the data collection
1007 * and continue to perform rate scale to find the rate table
1008 */
1009 rs_stay_in_table(lq_sta, true);
1010 goto done;
1011 }
1012
1013 /*
1014 * Updating the frame history depends on whether packets were
1015 * aggregated.
1016 *
1017 * For aggregation, all packets were transmitted at the same rate, the
1018 * first index into rate scale table.
1019 */
1020 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1021 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
1022 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
1023 &rs_index);
1024 rs_collect_tx_data(curr_tbl, rs_index,
1025 info->status.ampdu_len,
1026 info->status.ampdu_ack_len);
1027
1028 /* Update success/fail counts if not searching for new mode */
1029 if (lq_sta->stay_in_tbl) {
1030 lq_sta->total_success += info->status.ampdu_ack_len;
1031 lq_sta->total_failed += (info->status.ampdu_len -
1032 info->status.ampdu_ack_len);
1033 }
1034 } else {
1035 /*
1036 * For legacy, update frame history with for each Tx retry.
1037 */
1038 retries = info->status.rates[0].count - 1;
1039 /* HW doesn't send more than 15 retries */
1040 retries = min(retries, 15);
1041
1042 /* The last transmission may have been successful */
1043 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1044 /* Collect data for each rate used during failed TX attempts */
1045 for (i = 0; i <= retries; ++i) {
1046 tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
1047 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
1048 &tbl_type, &rs_index);
1049 /*
1050 * Only collect stats if retried rate is in the same RS
1051 * table as active/search.
1052 */
1053 if (table_type_matches(&tbl_type, curr_tbl))
1054 tmp_tbl = curr_tbl;
1055 else if (table_type_matches(&tbl_type, other_tbl))
1056 tmp_tbl = other_tbl;
1057 else
1058 continue;
1059 rs_collect_tx_data(tmp_tbl, rs_index, 1,
1060 i < retries ? 0 : legacy_success);
1061 }
1062
1063 /* Update success/fail counts if not searching for new mode */
1064 if (lq_sta->stay_in_tbl) {
1065 lq_sta->total_success += legacy_success;
1066 lq_sta->total_failed += retries + (1 - legacy_success);
1067 }
1068 }
1069 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1070 lq_sta->last_rate_n_flags = tx_rate;
1071 done:
1072 /* See if there's a better rate or modulation mode to try. */
1073 if (sta && sta->supp_rates[sband->band])
1074 rs_rate_scale_perform(priv, skb, sta, lq_sta);
1075 #ifdef CONFIG_MAC80211_DEBUGFS
1076 if (priv->dbg_fixed_rate != lq_sta->dbg_fixed_rate)
1077 rs_program_fix_rate(priv, lq_sta);
1078 #endif
1079 if (priv->cfg->bt_params && priv->cfg->bt_params->advanced_bt_coexist)
1080 rs_bt_update_lq(priv, ctx, lq_sta);
1081 }
1082
1083 /*
1084 * Begin a period of staying with a selected modulation mode.
1085 * Set "stay_in_tbl" flag to prevent any mode switches.
1086 * Set frame tx success limits according to legacy vs. high-throughput,
1087 * and reset overall (spanning all rates) tx success history statistics.
1088 * These control how long we stay using same modulation mode before
1089 * searching for a new mode.
1090 */
1091 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
1092 struct iwl_lq_sta *lq_sta)
1093 {
1094 IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
1095 lq_sta->stay_in_tbl = 1; /* only place this gets set */
1096 if (is_legacy) {
1097 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1098 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1099 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1100 } else {
1101 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1102 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1103 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1104 }
1105 lq_sta->table_count = 0;
1106 lq_sta->total_failed = 0;
1107 lq_sta->total_success = 0;
1108 lq_sta->flush_timer = jiffies;
1109 lq_sta->action_counter = 0;
1110 }
1111
1112 /*
1113 * Find correct throughput table for given mode of modulation
1114 */
1115 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1116 struct iwl_scale_tbl_info *tbl)
1117 {
1118 /* Used to choose among HT tables */
1119 s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1120
1121 /* Check for invalid LQ type */
1122 if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1123 tbl->expected_tpt = expected_tpt_legacy;
1124 return;
1125 }
1126
1127 /* Legacy rates have only one table */
1128 if (is_legacy(tbl->lq_type)) {
1129 tbl->expected_tpt = expected_tpt_legacy;
1130 return;
1131 }
1132
1133 /* Choose among many HT tables depending on number of streams
1134 * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
1135 * status */
1136 if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1137 ht_tbl_pointer = expected_tpt_siso20MHz;
1138 else if (is_siso(tbl->lq_type))
1139 ht_tbl_pointer = expected_tpt_siso40MHz;
1140 else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1141 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1142 else if (is_mimo2(tbl->lq_type))
1143 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1144 else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1145 ht_tbl_pointer = expected_tpt_mimo3_20MHz;
1146 else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
1147 ht_tbl_pointer = expected_tpt_mimo3_40MHz;
1148
1149 if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */
1150 tbl->expected_tpt = ht_tbl_pointer[0];
1151 else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */
1152 tbl->expected_tpt = ht_tbl_pointer[1];
1153 else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */
1154 tbl->expected_tpt = ht_tbl_pointer[2];
1155 else /* AGG+SGI */
1156 tbl->expected_tpt = ht_tbl_pointer[3];
1157 }
1158
1159 /*
1160 * Find starting rate for new "search" high-throughput mode of modulation.
1161 * Goal is to find lowest expected rate (under perfect conditions) that is
1162 * above the current measured throughput of "active" mode, to give new mode
1163 * a fair chance to prove itself without too many challenges.
1164 *
1165 * This gets called when transitioning to more aggressive modulation
1166 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1167 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1168 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1169 * bit rate will typically need to increase, but not if performance was bad.
1170 */
1171 static s32 rs_get_best_rate(struct iwl_priv *priv,
1172 struct iwl_lq_sta *lq_sta,
1173 struct iwl_scale_tbl_info *tbl, /* "search" */
1174 u16 rate_mask, s8 index)
1175 {
1176 /* "active" values */
1177 struct iwl_scale_tbl_info *active_tbl =
1178 &(lq_sta->lq_info[lq_sta->active_tbl]);
1179 s32 active_sr = active_tbl->win[index].success_ratio;
1180 s32 active_tpt = active_tbl->expected_tpt[index];
1181
1182 /* expected "search" throughput */
1183 s32 *tpt_tbl = tbl->expected_tpt;
1184
1185 s32 new_rate, high, low, start_hi;
1186 u16 high_low;
1187 s8 rate = index;
1188
1189 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1190
1191 for (; ;) {
1192 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1193 tbl->lq_type);
1194
1195 low = high_low & 0xff;
1196 high = (high_low >> 8) & 0xff;
1197
1198 /*
1199 * Lower the "search" bit rate, to give new "search" mode
1200 * approximately the same throughput as "active" if:
1201 *
1202 * 1) "Active" mode has been working modestly well (but not
1203 * great), and expected "search" throughput (under perfect
1204 * conditions) at candidate rate is above the actual
1205 * measured "active" throughput (but less than expected
1206 * "active" throughput under perfect conditions).
1207 * OR
1208 * 2) "Active" mode has been working perfectly or very well
1209 * and expected "search" throughput (under perfect
1210 * conditions) at candidate rate is above expected
1211 * "active" throughput (under perfect conditions).
1212 */
1213 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1214 ((active_sr > IWL_RATE_DECREASE_TH) &&
1215 (active_sr <= IWL_RATE_HIGH_TH) &&
1216 (tpt_tbl[rate] <= active_tpt))) ||
1217 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1218 (tpt_tbl[rate] > active_tpt))) {
1219
1220 /* (2nd or later pass)
1221 * If we've already tried to raise the rate, and are
1222 * now trying to lower it, use the higher rate. */
1223 if (start_hi != IWL_RATE_INVALID) {
1224 new_rate = start_hi;
1225 break;
1226 }
1227
1228 new_rate = rate;
1229
1230 /* Loop again with lower rate */
1231 if (low != IWL_RATE_INVALID)
1232 rate = low;
1233
1234 /* Lower rate not available, use the original */
1235 else
1236 break;
1237
1238 /* Else try to raise the "search" rate to match "active" */
1239 } else {
1240 /* (2nd or later pass)
1241 * If we've already tried to lower the rate, and are
1242 * now trying to raise it, use the lower rate. */
1243 if (new_rate != IWL_RATE_INVALID)
1244 break;
1245
1246 /* Loop again with higher rate */
1247 else if (high != IWL_RATE_INVALID) {
1248 start_hi = high;
1249 rate = high;
1250
1251 /* Higher rate not available, use the original */
1252 } else {
1253 new_rate = rate;
1254 break;
1255 }
1256 }
1257 }
1258
1259 return new_rate;
1260 }
1261
1262 /*
1263 * Set up search table for MIMO2
1264 */
1265 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1266 struct iwl_lq_sta *lq_sta,
1267 struct ieee80211_conf *conf,
1268 struct ieee80211_sta *sta,
1269 struct iwl_scale_tbl_info *tbl, int index)
1270 {
1271 u16 rate_mask;
1272 s32 rate;
1273 s8 is_green = lq_sta->is_green;
1274 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1275 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1276
1277 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1278 return -1;
1279
1280 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1281 == WLAN_HT_CAP_SM_PS_STATIC)
1282 return -1;
1283
1284 /* Need both Tx chains/antennas to support MIMO */
1285 if (priv->hw_params.tx_chains_num < 2)
1286 return -1;
1287
1288 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1289
1290 tbl->lq_type = LQ_MIMO2;
1291 tbl->is_dup = lq_sta->is_dup;
1292 tbl->action = 0;
1293 tbl->max_search = IWL_MAX_SEARCH;
1294 rate_mask = lq_sta->active_mimo2_rate;
1295
1296 if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1297 tbl->is_ht40 = 1;
1298 else
1299 tbl->is_ht40 = 0;
1300
1301 rs_set_expected_tpt_table(lq_sta, tbl);
1302
1303 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1304
1305 IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1306 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1307 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1308 rate, rate_mask);
1309 return -1;
1310 }
1311 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1312
1313 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1314 tbl->current_rate, is_green);
1315 return 0;
1316 }
1317
1318 /*
1319 * Set up search table for MIMO3
1320 */
1321 static int rs_switch_to_mimo3(struct iwl_priv *priv,
1322 struct iwl_lq_sta *lq_sta,
1323 struct ieee80211_conf *conf,
1324 struct ieee80211_sta *sta,
1325 struct iwl_scale_tbl_info *tbl, int index)
1326 {
1327 u16 rate_mask;
1328 s32 rate;
1329 s8 is_green = lq_sta->is_green;
1330 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1331 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1332
1333 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1334 return -1;
1335
1336 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1337 == WLAN_HT_CAP_SM_PS_STATIC)
1338 return -1;
1339
1340 /* Need both Tx chains/antennas to support MIMO */
1341 if (priv->hw_params.tx_chains_num < 3)
1342 return -1;
1343
1344 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1345
1346 tbl->lq_type = LQ_MIMO3;
1347 tbl->is_dup = lq_sta->is_dup;
1348 tbl->action = 0;
1349 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1350 rate_mask = lq_sta->active_mimo3_rate;
1351
1352 if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1353 tbl->is_ht40 = 1;
1354 else
1355 tbl->is_ht40 = 0;
1356
1357 rs_set_expected_tpt_table(lq_sta, tbl);
1358
1359 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1360
1361 IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1362 rate, rate_mask);
1363 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1364 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1365 rate, rate_mask);
1366 return -1;
1367 }
1368 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1369
1370 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1371 tbl->current_rate, is_green);
1372 return 0;
1373 }
1374
1375 /*
1376 * Set up search table for SISO
1377 */
1378 static int rs_switch_to_siso(struct iwl_priv *priv,
1379 struct iwl_lq_sta *lq_sta,
1380 struct ieee80211_conf *conf,
1381 struct ieee80211_sta *sta,
1382 struct iwl_scale_tbl_info *tbl, int index)
1383 {
1384 u16 rate_mask;
1385 u8 is_green = lq_sta->is_green;
1386 s32 rate;
1387 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1388 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1389
1390 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1391 return -1;
1392
1393 IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1394
1395 tbl->is_dup = lq_sta->is_dup;
1396 tbl->lq_type = LQ_SISO;
1397 tbl->action = 0;
1398 tbl->max_search = IWL_MAX_SEARCH;
1399 rate_mask = lq_sta->active_siso_rate;
1400
1401 if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1402 tbl->is_ht40 = 1;
1403 else
1404 tbl->is_ht40 = 0;
1405
1406 if (is_green)
1407 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1408
1409 rs_set_expected_tpt_table(lq_sta, tbl);
1410 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1411
1412 IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1413 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1414 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1415 rate, rate_mask);
1416 return -1;
1417 }
1418 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1419 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1420 tbl->current_rate, is_green);
1421 return 0;
1422 }
1423
1424 /*
1425 * Try to switch to new modulation mode from legacy
1426 */
1427 static int rs_move_legacy_other(struct iwl_priv *priv,
1428 struct iwl_lq_sta *lq_sta,
1429 struct ieee80211_conf *conf,
1430 struct ieee80211_sta *sta,
1431 int index)
1432 {
1433 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1434 struct iwl_scale_tbl_info *search_tbl =
1435 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1436 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1437 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1438 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1439 u8 start_action;
1440 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1441 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1442 int ret = 0;
1443 u8 update_search_tbl_counter = 0;
1444
1445 switch (priv->bt_traffic_load) {
1446 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1447 /* nothing */
1448 break;
1449 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1450 /* avoid antenna B unless MIMO */
1451 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1452 if (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2)
1453 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1454 break;
1455 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1456 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1457 /* avoid antenna B and MIMO */
1458 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1459 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2 &&
1460 tbl->action != IWL_LEGACY_SWITCH_SISO)
1461 tbl->action = IWL_LEGACY_SWITCH_SISO;
1462 break;
1463 default:
1464 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1465 break;
1466 }
1467
1468 if (!iwl_ht_enabled(priv))
1469 /* stay in Legacy */
1470 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1471 else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1472 tbl->action > IWL_LEGACY_SWITCH_SISO)
1473 tbl->action = IWL_LEGACY_SWITCH_SISO;
1474
1475 /* configure as 1x1 if bt full concurrency */
1476 if (priv->bt_full_concurrent) {
1477 if (!iwl_ht_enabled(priv))
1478 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1479 else if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1480 tbl->action = IWL_LEGACY_SWITCH_SISO;
1481 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1482 }
1483
1484 start_action = tbl->action;
1485 for (; ;) {
1486 lq_sta->action_counter++;
1487 switch (tbl->action) {
1488 case IWL_LEGACY_SWITCH_ANTENNA1:
1489 case IWL_LEGACY_SWITCH_ANTENNA2:
1490 IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1491
1492 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1493 tx_chains_num <= 1) ||
1494 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1495 tx_chains_num <= 2))
1496 break;
1497
1498 /* Don't change antenna if success has been great */
1499 if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1500 !priv->bt_full_concurrent &&
1501 priv->bt_traffic_load ==
1502 IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1503 break;
1504
1505 /* Set up search table to try other antenna */
1506 memcpy(search_tbl, tbl, sz);
1507
1508 if (rs_toggle_antenna(valid_tx_ant,
1509 &search_tbl->current_rate, search_tbl)) {
1510 update_search_tbl_counter = 1;
1511 rs_set_expected_tpt_table(lq_sta, search_tbl);
1512 goto out;
1513 }
1514 break;
1515 case IWL_LEGACY_SWITCH_SISO:
1516 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1517
1518 /* Set up search table to try SISO */
1519 memcpy(search_tbl, tbl, sz);
1520 search_tbl->is_SGI = 0;
1521 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1522 search_tbl, index);
1523 if (!ret) {
1524 lq_sta->action_counter = 0;
1525 goto out;
1526 }
1527
1528 break;
1529 case IWL_LEGACY_SWITCH_MIMO2_AB:
1530 case IWL_LEGACY_SWITCH_MIMO2_AC:
1531 case IWL_LEGACY_SWITCH_MIMO2_BC:
1532 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1533
1534 /* Set up search table to try MIMO */
1535 memcpy(search_tbl, tbl, sz);
1536 search_tbl->is_SGI = 0;
1537
1538 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1539 search_tbl->ant_type = ANT_AB;
1540 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1541 search_tbl->ant_type = ANT_AC;
1542 else
1543 search_tbl->ant_type = ANT_BC;
1544
1545 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1546 break;
1547
1548 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1549 search_tbl, index);
1550 if (!ret) {
1551 lq_sta->action_counter = 0;
1552 goto out;
1553 }
1554 break;
1555
1556 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1557 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1558
1559 /* Set up search table to try MIMO3 */
1560 memcpy(search_tbl, tbl, sz);
1561 search_tbl->is_SGI = 0;
1562
1563 search_tbl->ant_type = ANT_ABC;
1564
1565 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1566 break;
1567
1568 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1569 search_tbl, index);
1570 if (!ret) {
1571 lq_sta->action_counter = 0;
1572 goto out;
1573 }
1574 break;
1575 }
1576 tbl->action++;
1577 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1578 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1579
1580 if (tbl->action == start_action)
1581 break;
1582
1583 }
1584 search_tbl->lq_type = LQ_NONE;
1585 return 0;
1586
1587 out:
1588 lq_sta->search_better_tbl = 1;
1589 tbl->action++;
1590 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1591 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1592 if (update_search_tbl_counter)
1593 search_tbl->action = tbl->action;
1594 return 0;
1595
1596 }
1597
1598 /*
1599 * Try to switch to new modulation mode from SISO
1600 */
1601 static int rs_move_siso_to_other(struct iwl_priv *priv,
1602 struct iwl_lq_sta *lq_sta,
1603 struct ieee80211_conf *conf,
1604 struct ieee80211_sta *sta, int index)
1605 {
1606 u8 is_green = lq_sta->is_green;
1607 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1608 struct iwl_scale_tbl_info *search_tbl =
1609 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1610 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1611 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1612 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1613 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1614 u8 start_action;
1615 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1616 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1617 u8 update_search_tbl_counter = 0;
1618 int ret;
1619
1620 switch (priv->bt_traffic_load) {
1621 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1622 /* nothing */
1623 break;
1624 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1625 /* avoid antenna B unless MIMO */
1626 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1627 if (tbl->action == IWL_SISO_SWITCH_ANTENNA2)
1628 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1629 break;
1630 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1631 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1632 /* avoid antenna B and MIMO */
1633 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1634 if (tbl->action != IWL_SISO_SWITCH_ANTENNA1)
1635 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1636 break;
1637 default:
1638 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1639 break;
1640 }
1641
1642 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1643 tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1644 /* stay in SISO */
1645 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1646 }
1647
1648 /* configure as 1x1 if bt full concurrency */
1649 if (priv->bt_full_concurrent) {
1650 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1651 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1652 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1653 }
1654
1655 start_action = tbl->action;
1656 for (;;) {
1657 lq_sta->action_counter++;
1658 switch (tbl->action) {
1659 case IWL_SISO_SWITCH_ANTENNA1:
1660 case IWL_SISO_SWITCH_ANTENNA2:
1661 IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1662 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1663 tx_chains_num <= 1) ||
1664 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1665 tx_chains_num <= 2))
1666 break;
1667
1668 if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1669 !priv->bt_full_concurrent &&
1670 priv->bt_traffic_load ==
1671 IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1672 break;
1673
1674 memcpy(search_tbl, tbl, sz);
1675 if (rs_toggle_antenna(valid_tx_ant,
1676 &search_tbl->current_rate, search_tbl)) {
1677 update_search_tbl_counter = 1;
1678 goto out;
1679 }
1680 break;
1681 case IWL_SISO_SWITCH_MIMO2_AB:
1682 case IWL_SISO_SWITCH_MIMO2_AC:
1683 case IWL_SISO_SWITCH_MIMO2_BC:
1684 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1685 memcpy(search_tbl, tbl, sz);
1686 search_tbl->is_SGI = 0;
1687
1688 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1689 search_tbl->ant_type = ANT_AB;
1690 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1691 search_tbl->ant_type = ANT_AC;
1692 else
1693 search_tbl->ant_type = ANT_BC;
1694
1695 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1696 break;
1697
1698 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1699 search_tbl, index);
1700 if (!ret)
1701 goto out;
1702 break;
1703 case IWL_SISO_SWITCH_GI:
1704 if (!tbl->is_ht40 && !(ht_cap->cap &
1705 IEEE80211_HT_CAP_SGI_20))
1706 break;
1707 if (tbl->is_ht40 && !(ht_cap->cap &
1708 IEEE80211_HT_CAP_SGI_40))
1709 break;
1710
1711 IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1712
1713 memcpy(search_tbl, tbl, sz);
1714 if (is_green) {
1715 if (!tbl->is_SGI)
1716 break;
1717 else
1718 IWL_ERR(priv,
1719 "SGI was set in GF+SISO\n");
1720 }
1721 search_tbl->is_SGI = !tbl->is_SGI;
1722 rs_set_expected_tpt_table(lq_sta, search_tbl);
1723 if (tbl->is_SGI) {
1724 s32 tpt = lq_sta->last_tpt / 100;
1725 if (tpt >= search_tbl->expected_tpt[index])
1726 break;
1727 }
1728 search_tbl->current_rate =
1729 rate_n_flags_from_tbl(priv, search_tbl,
1730 index, is_green);
1731 update_search_tbl_counter = 1;
1732 goto out;
1733 case IWL_SISO_SWITCH_MIMO3_ABC:
1734 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1735 memcpy(search_tbl, tbl, sz);
1736 search_tbl->is_SGI = 0;
1737 search_tbl->ant_type = ANT_ABC;
1738
1739 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1740 break;
1741
1742 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1743 search_tbl, index);
1744 if (!ret)
1745 goto out;
1746 break;
1747 }
1748 tbl->action++;
1749 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1750 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1751
1752 if (tbl->action == start_action)
1753 break;
1754 }
1755 search_tbl->lq_type = LQ_NONE;
1756 return 0;
1757
1758 out:
1759 lq_sta->search_better_tbl = 1;
1760 tbl->action++;
1761 if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1762 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1763 if (update_search_tbl_counter)
1764 search_tbl->action = tbl->action;
1765
1766 return 0;
1767 }
1768
1769 /*
1770 * Try to switch to new modulation mode from MIMO2
1771 */
1772 static int rs_move_mimo2_to_other(struct iwl_priv *priv,
1773 struct iwl_lq_sta *lq_sta,
1774 struct ieee80211_conf *conf,
1775 struct ieee80211_sta *sta, int index)
1776 {
1777 s8 is_green = lq_sta->is_green;
1778 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1779 struct iwl_scale_tbl_info *search_tbl =
1780 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1781 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1782 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1783 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1784 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1785 u8 start_action;
1786 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1787 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1788 u8 update_search_tbl_counter = 0;
1789 int ret;
1790
1791 switch (priv->bt_traffic_load) {
1792 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1793 /* nothing */
1794 break;
1795 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1796 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1797 /* avoid antenna B and MIMO */
1798 if (tbl->action != IWL_MIMO2_SWITCH_SISO_A)
1799 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1800 break;
1801 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1802 /* avoid antenna B unless MIMO */
1803 if (tbl->action == IWL_MIMO2_SWITCH_SISO_B ||
1804 tbl->action == IWL_MIMO2_SWITCH_SISO_C)
1805 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1806 break;
1807 default:
1808 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1809 break;
1810 }
1811
1812 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1813 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1814 tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1815 /* switch in SISO */
1816 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1817 }
1818
1819 /* configure as 1x1 if bt full concurrency */
1820 if (priv->bt_full_concurrent &&
1821 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1822 tbl->action > IWL_MIMO2_SWITCH_SISO_C))
1823 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1824
1825 start_action = tbl->action;
1826 for (;;) {
1827 lq_sta->action_counter++;
1828 switch (tbl->action) {
1829 case IWL_MIMO2_SWITCH_ANTENNA1:
1830 case IWL_MIMO2_SWITCH_ANTENNA2:
1831 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1832
1833 if (tx_chains_num <= 2)
1834 break;
1835
1836 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1837 break;
1838
1839 memcpy(search_tbl, tbl, sz);
1840 if (rs_toggle_antenna(valid_tx_ant,
1841 &search_tbl->current_rate, search_tbl)) {
1842 update_search_tbl_counter = 1;
1843 goto out;
1844 }
1845 break;
1846 case IWL_MIMO2_SWITCH_SISO_A:
1847 case IWL_MIMO2_SWITCH_SISO_B:
1848 case IWL_MIMO2_SWITCH_SISO_C:
1849 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1850
1851 /* Set up new search table for SISO */
1852 memcpy(search_tbl, tbl, sz);
1853
1854 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1855 search_tbl->ant_type = ANT_A;
1856 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1857 search_tbl->ant_type = ANT_B;
1858 else
1859 search_tbl->ant_type = ANT_C;
1860
1861 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1862 break;
1863
1864 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1865 search_tbl, index);
1866 if (!ret)
1867 goto out;
1868
1869 break;
1870
1871 case IWL_MIMO2_SWITCH_GI:
1872 if (!tbl->is_ht40 && !(ht_cap->cap &
1873 IEEE80211_HT_CAP_SGI_20))
1874 break;
1875 if (tbl->is_ht40 && !(ht_cap->cap &
1876 IEEE80211_HT_CAP_SGI_40))
1877 break;
1878
1879 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1880
1881 /* Set up new search table for MIMO2 */
1882 memcpy(search_tbl, tbl, sz);
1883 search_tbl->is_SGI = !tbl->is_SGI;
1884 rs_set_expected_tpt_table(lq_sta, search_tbl);
1885 /*
1886 * If active table already uses the fastest possible
1887 * modulation (dual stream with short guard interval),
1888 * and it's working well, there's no need to look
1889 * for a better type of modulation!
1890 */
1891 if (tbl->is_SGI) {
1892 s32 tpt = lq_sta->last_tpt / 100;
1893 if (tpt >= search_tbl->expected_tpt[index])
1894 break;
1895 }
1896 search_tbl->current_rate =
1897 rate_n_flags_from_tbl(priv, search_tbl,
1898 index, is_green);
1899 update_search_tbl_counter = 1;
1900 goto out;
1901
1902 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1903 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1904 memcpy(search_tbl, tbl, sz);
1905 search_tbl->is_SGI = 0;
1906 search_tbl->ant_type = ANT_ABC;
1907
1908 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1909 break;
1910
1911 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1912 search_tbl, index);
1913 if (!ret)
1914 goto out;
1915
1916 break;
1917 }
1918 tbl->action++;
1919 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1920 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1921
1922 if (tbl->action == start_action)
1923 break;
1924 }
1925 search_tbl->lq_type = LQ_NONE;
1926 return 0;
1927 out:
1928 lq_sta->search_better_tbl = 1;
1929 tbl->action++;
1930 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1931 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1932 if (update_search_tbl_counter)
1933 search_tbl->action = tbl->action;
1934
1935 return 0;
1936
1937 }
1938
1939 /*
1940 * Try to switch to new modulation mode from MIMO3
1941 */
1942 static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1943 struct iwl_lq_sta *lq_sta,
1944 struct ieee80211_conf *conf,
1945 struct ieee80211_sta *sta, int index)
1946 {
1947 s8 is_green = lq_sta->is_green;
1948 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1949 struct iwl_scale_tbl_info *search_tbl =
1950 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1951 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1952 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1953 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1954 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1955 u8 start_action;
1956 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1957 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1958 int ret;
1959 u8 update_search_tbl_counter = 0;
1960
1961 switch (priv->bt_traffic_load) {
1962 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1963 /* nothing */
1964 break;
1965 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1966 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1967 /* avoid antenna B and MIMO */
1968 if (tbl->action != IWL_MIMO3_SWITCH_SISO_A)
1969 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1970 break;
1971 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1972 /* avoid antenna B unless MIMO */
1973 if (tbl->action == IWL_MIMO3_SWITCH_SISO_B ||
1974 tbl->action == IWL_MIMO3_SWITCH_SISO_C)
1975 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1976 break;
1977 default:
1978 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1979 break;
1980 }
1981
1982 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1983 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1984 tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1985 /* switch in SISO */
1986 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1987 }
1988
1989 /* configure as 1x1 if bt full concurrency */
1990 if (priv->bt_full_concurrent &&
1991 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1992 tbl->action > IWL_MIMO3_SWITCH_SISO_C))
1993 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1994
1995 start_action = tbl->action;
1996 for (;;) {
1997 lq_sta->action_counter++;
1998 switch (tbl->action) {
1999 case IWL_MIMO3_SWITCH_ANTENNA1:
2000 case IWL_MIMO3_SWITCH_ANTENNA2:
2001 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
2002
2003 if (tx_chains_num <= 3)
2004 break;
2005
2006 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
2007 break;
2008
2009 memcpy(search_tbl, tbl, sz);
2010 if (rs_toggle_antenna(valid_tx_ant,
2011 &search_tbl->current_rate, search_tbl))
2012 goto out;
2013 break;
2014 case IWL_MIMO3_SWITCH_SISO_A:
2015 case IWL_MIMO3_SWITCH_SISO_B:
2016 case IWL_MIMO3_SWITCH_SISO_C:
2017 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
2018
2019 /* Set up new search table for SISO */
2020 memcpy(search_tbl, tbl, sz);
2021
2022 if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
2023 search_tbl->ant_type = ANT_A;
2024 else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
2025 search_tbl->ant_type = ANT_B;
2026 else
2027 search_tbl->ant_type = ANT_C;
2028
2029 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2030 break;
2031
2032 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
2033 search_tbl, index);
2034 if (!ret)
2035 goto out;
2036
2037 break;
2038
2039 case IWL_MIMO3_SWITCH_MIMO2_AB:
2040 case IWL_MIMO3_SWITCH_MIMO2_AC:
2041 case IWL_MIMO3_SWITCH_MIMO2_BC:
2042 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
2043
2044 memcpy(search_tbl, tbl, sz);
2045 search_tbl->is_SGI = 0;
2046 if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
2047 search_tbl->ant_type = ANT_AB;
2048 else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
2049 search_tbl->ant_type = ANT_AC;
2050 else
2051 search_tbl->ant_type = ANT_BC;
2052
2053 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2054 break;
2055
2056 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
2057 search_tbl, index);
2058 if (!ret)
2059 goto out;
2060
2061 break;
2062
2063 case IWL_MIMO3_SWITCH_GI:
2064 if (!tbl->is_ht40 && !(ht_cap->cap &
2065 IEEE80211_HT_CAP_SGI_20))
2066 break;
2067 if (tbl->is_ht40 && !(ht_cap->cap &
2068 IEEE80211_HT_CAP_SGI_40))
2069 break;
2070
2071 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
2072
2073 /* Set up new search table for MIMO */
2074 memcpy(search_tbl, tbl, sz);
2075 search_tbl->is_SGI = !tbl->is_SGI;
2076 rs_set_expected_tpt_table(lq_sta, search_tbl);
2077 /*
2078 * If active table already uses the fastest possible
2079 * modulation (dual stream with short guard interval),
2080 * and it's working well, there's no need to look
2081 * for a better type of modulation!
2082 */
2083 if (tbl->is_SGI) {
2084 s32 tpt = lq_sta->last_tpt / 100;
2085 if (tpt >= search_tbl->expected_tpt[index])
2086 break;
2087 }
2088 search_tbl->current_rate =
2089 rate_n_flags_from_tbl(priv, search_tbl,
2090 index, is_green);
2091 update_search_tbl_counter = 1;
2092 goto out;
2093 }
2094 tbl->action++;
2095 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2096 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2097
2098 if (tbl->action == start_action)
2099 break;
2100 }
2101 search_tbl->lq_type = LQ_NONE;
2102 return 0;
2103 out:
2104 lq_sta->search_better_tbl = 1;
2105 tbl->action++;
2106 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2107 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2108 if (update_search_tbl_counter)
2109 search_tbl->action = tbl->action;
2110
2111 return 0;
2112
2113 }
2114
2115 /*
2116 * Check whether we should continue using same modulation mode, or
2117 * begin search for a new mode, based on:
2118 * 1) # tx successes or failures while using this mode
2119 * 2) # times calling this function
2120 * 3) elapsed time in this mode (not used, for now)
2121 */
2122 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
2123 {
2124 struct iwl_scale_tbl_info *tbl;
2125 int i;
2126 int active_tbl;
2127 int flush_interval_passed = 0;
2128 struct iwl_priv *priv;
2129
2130 priv = lq_sta->drv;
2131 active_tbl = lq_sta->active_tbl;
2132
2133 tbl = &(lq_sta->lq_info[active_tbl]);
2134
2135 /* If we've been disallowing search, see if we should now allow it */
2136 if (lq_sta->stay_in_tbl) {
2137
2138 /* Elapsed time using current modulation mode */
2139 if (lq_sta->flush_timer)
2140 flush_interval_passed =
2141 time_after(jiffies,
2142 (unsigned long)(lq_sta->flush_timer +
2143 IWL_RATE_SCALE_FLUSH_INTVL));
2144
2145 /*
2146 * Check if we should allow search for new modulation mode.
2147 * If many frames have failed or succeeded, or we've used
2148 * this same modulation for a long time, allow search, and
2149 * reset history stats that keep track of whether we should
2150 * allow a new search. Also (below) reset all bitmaps and
2151 * stats in active history.
2152 */
2153 if (force_search ||
2154 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
2155 (lq_sta->total_success > lq_sta->max_success_limit) ||
2156 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
2157 && (flush_interval_passed))) {
2158 IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n:",
2159 lq_sta->total_failed,
2160 lq_sta->total_success,
2161 flush_interval_passed);
2162
2163 /* Allow search for new mode */
2164 lq_sta->stay_in_tbl = 0; /* only place reset */
2165 lq_sta->total_failed = 0;
2166 lq_sta->total_success = 0;
2167 lq_sta->flush_timer = 0;
2168
2169 /*
2170 * Else if we've used this modulation mode enough repetitions
2171 * (regardless of elapsed time or success/failure), reset
2172 * history bitmaps and rate-specific stats for all rates in
2173 * active table.
2174 */
2175 } else {
2176 lq_sta->table_count++;
2177 if (lq_sta->table_count >=
2178 lq_sta->table_count_limit) {
2179 lq_sta->table_count = 0;
2180
2181 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
2182 for (i = 0; i < IWL_RATE_COUNT; i++)
2183 rs_rate_scale_clear_window(
2184 &(tbl->win[i]));
2185 }
2186 }
2187
2188 /* If transitioning to allow "search", reset all history
2189 * bitmaps and stats in active table (this will become the new
2190 * "search" table). */
2191 if (!lq_sta->stay_in_tbl) {
2192 for (i = 0; i < IWL_RATE_COUNT; i++)
2193 rs_rate_scale_clear_window(&(tbl->win[i]));
2194 }
2195 }
2196 }
2197
2198 /*
2199 * setup rate table in uCode
2200 * return rate_n_flags as used in the table
2201 */
2202 static void rs_update_rate_tbl(struct iwl_priv *priv,
2203 struct iwl_rxon_context *ctx,
2204 struct iwl_lq_sta *lq_sta,
2205 struct iwl_scale_tbl_info *tbl,
2206 int index, u8 is_green)
2207 {
2208 u32 rate;
2209
2210 /* Update uCode's rate table. */
2211 rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2212 rs_fill_link_cmd(priv, lq_sta, rate);
2213 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2214 }
2215
2216 /*
2217 * Do rate scaling and search for new modulation mode.
2218 */
2219 static void rs_rate_scale_perform(struct iwl_priv *priv,
2220 struct sk_buff *skb,
2221 struct ieee80211_sta *sta,
2222 struct iwl_lq_sta *lq_sta)
2223 {
2224 struct ieee80211_hw *hw = priv->hw;
2225 struct ieee80211_conf *conf = &hw->conf;
2226 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2227 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2228 int low = IWL_RATE_INVALID;
2229 int high = IWL_RATE_INVALID;
2230 int index;
2231 int i;
2232 struct iwl_rate_scale_data *window = NULL;
2233 int current_tpt = IWL_INVALID_VALUE;
2234 int low_tpt = IWL_INVALID_VALUE;
2235 int high_tpt = IWL_INVALID_VALUE;
2236 u32 fail_count;
2237 s8 scale_action = 0;
2238 u16 rate_mask;
2239 u8 update_lq = 0;
2240 struct iwl_scale_tbl_info *tbl, *tbl1;
2241 u16 rate_scale_index_msk = 0;
2242 u8 is_green = 0;
2243 u8 active_tbl = 0;
2244 u8 done_search = 0;
2245 u16 high_low;
2246 s32 sr;
2247 u8 tid = MAX_TID_COUNT;
2248 struct iwl_tid_data *tid_data;
2249 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
2250 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
2251
2252 IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
2253
2254 /* Send management frames and NO_ACK data using lowest rate. */
2255 /* TODO: this could probably be improved.. */
2256 if (!ieee80211_is_data(hdr->frame_control) ||
2257 info->flags & IEEE80211_TX_CTL_NO_ACK)
2258 return;
2259
2260 if (!sta || !lq_sta)
2261 return;
2262
2263 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
2264
2265 tid = rs_tl_add_packet(lq_sta, hdr);
2266 if ((tid != MAX_TID_COUNT) && (lq_sta->tx_agg_tid_en & (1 << tid))) {
2267 tid_data = &priv->stations[lq_sta->lq.sta_id].tid[tid];
2268 if (tid_data->agg.state == IWL_AGG_OFF)
2269 lq_sta->is_agg = 0;
2270 else
2271 lq_sta->is_agg = 1;
2272 } else
2273 lq_sta->is_agg = 0;
2274
2275 /*
2276 * Select rate-scale / modulation-mode table to work with in
2277 * the rest of this function: "search" if searching for better
2278 * modulation mode, or "active" if doing rate scaling within a mode.
2279 */
2280 if (!lq_sta->search_better_tbl)
2281 active_tbl = lq_sta->active_tbl;
2282 else
2283 active_tbl = 1 - lq_sta->active_tbl;
2284
2285 tbl = &(lq_sta->lq_info[active_tbl]);
2286 if (is_legacy(tbl->lq_type))
2287 lq_sta->is_green = 0;
2288 else
2289 lq_sta->is_green = rs_use_green(sta);
2290 is_green = lq_sta->is_green;
2291
2292 /* current tx rate */
2293 index = lq_sta->last_txrate_idx;
2294
2295 IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2296 tbl->lq_type);
2297
2298 /* rates available for this association, and for modulation mode */
2299 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2300
2301 IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
2302
2303 /* mask with station rate restriction */
2304 if (is_legacy(tbl->lq_type)) {
2305 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2306 /* supp_rates has no CCK bits in A mode */
2307 rate_scale_index_msk = (u16) (rate_mask &
2308 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2309 else
2310 rate_scale_index_msk = (u16) (rate_mask &
2311 lq_sta->supp_rates);
2312
2313 } else
2314 rate_scale_index_msk = rate_mask;
2315
2316 if (!rate_scale_index_msk)
2317 rate_scale_index_msk = rate_mask;
2318
2319 if (!((1 << index) & rate_scale_index_msk)) {
2320 IWL_ERR(priv, "Current Rate is not valid\n");
2321 if (lq_sta->search_better_tbl) {
2322 /* revert to active table if search table is not valid*/
2323 tbl->lq_type = LQ_NONE;
2324 lq_sta->search_better_tbl = 0;
2325 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2326 /* get "active" rate info */
2327 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2328 rs_update_rate_tbl(priv, ctx, lq_sta, tbl,
2329 index, is_green);
2330 }
2331 return;
2332 }
2333
2334 /* Get expected throughput table and history window for current rate */
2335 if (!tbl->expected_tpt) {
2336 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2337 return;
2338 }
2339
2340 /* force user max rate if set by user */
2341 if ((lq_sta->max_rate_idx != -1) &&
2342 (lq_sta->max_rate_idx < index)) {
2343 index = lq_sta->max_rate_idx;
2344 update_lq = 1;
2345 window = &(tbl->win[index]);
2346 goto lq_update;
2347 }
2348
2349 window = &(tbl->win[index]);
2350
2351 /*
2352 * If there is not enough history to calculate actual average
2353 * throughput, keep analyzing results of more tx frames, without
2354 * changing rate or mode (bypass most of the rest of this function).
2355 * Set up new rate table in uCode only if old rate is not supported
2356 * in current association (use new rate found above).
2357 */
2358 fail_count = window->counter - window->success_counter;
2359 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2360 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2361 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2362 "for index %d\n",
2363 window->success_counter, window->counter, index);
2364
2365 /* Can't calculate this yet; not enough history */
2366 window->average_tpt = IWL_INVALID_VALUE;
2367
2368 /* Should we stay with this modulation mode,
2369 * or search for a new one? */
2370 rs_stay_in_table(lq_sta, false);
2371
2372 goto out;
2373 }
2374 /* Else we have enough samples; calculate estimate of
2375 * actual average throughput */
2376 if (window->average_tpt != ((window->success_ratio *
2377 tbl->expected_tpt[index] + 64) / 128)) {
2378 IWL_ERR(priv, "expected_tpt should have been calculated by now\n");
2379 window->average_tpt = ((window->success_ratio *
2380 tbl->expected_tpt[index] + 64) / 128);
2381 }
2382
2383 /* If we are searching for better modulation mode, check success. */
2384 if (lq_sta->search_better_tbl &&
2385 (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
2386 /* If good success, continue using the "search" mode;
2387 * no need to send new link quality command, since we're
2388 * continuing to use the setup that we've been trying. */
2389 if (window->average_tpt > lq_sta->last_tpt) {
2390
2391 IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2392 "suc=%d cur-tpt=%d old-tpt=%d\n",
2393 window->success_ratio,
2394 window->average_tpt,
2395 lq_sta->last_tpt);
2396
2397 if (!is_legacy(tbl->lq_type))
2398 lq_sta->enable_counter = 1;
2399
2400 /* Swap tables; "search" becomes "active" */
2401 lq_sta->active_tbl = active_tbl;
2402 current_tpt = window->average_tpt;
2403
2404 /* Else poor success; go back to mode in "active" table */
2405 } else {
2406
2407 IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2408 "suc=%d cur-tpt=%d old-tpt=%d\n",
2409 window->success_ratio,
2410 window->average_tpt,
2411 lq_sta->last_tpt);
2412
2413 /* Nullify "search" table */
2414 tbl->lq_type = LQ_NONE;
2415
2416 /* Revert to "active" table */
2417 active_tbl = lq_sta->active_tbl;
2418 tbl = &(lq_sta->lq_info[active_tbl]);
2419
2420 /* Revert to "active" rate and throughput info */
2421 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2422 current_tpt = lq_sta->last_tpt;
2423
2424 /* Need to set up a new rate table in uCode */
2425 update_lq = 1;
2426 }
2427
2428 /* Either way, we've made a decision; modulation mode
2429 * search is done, allow rate adjustment next time. */
2430 lq_sta->search_better_tbl = 0;
2431 done_search = 1; /* Don't switch modes below! */
2432 goto lq_update;
2433 }
2434
2435 /* (Else) not in search of better modulation mode, try for better
2436 * starting rate, while staying in this mode. */
2437 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2438 tbl->lq_type);
2439 low = high_low & 0xff;
2440 high = (high_low >> 8) & 0xff;
2441
2442 /* If user set max rate, dont allow higher than user constrain */
2443 if ((lq_sta->max_rate_idx != -1) &&
2444 (lq_sta->max_rate_idx < high))
2445 high = IWL_RATE_INVALID;
2446
2447 sr = window->success_ratio;
2448
2449 /* Collect measured throughputs for current and adjacent rates */
2450 current_tpt = window->average_tpt;
2451 if (low != IWL_RATE_INVALID)
2452 low_tpt = tbl->win[low].average_tpt;
2453 if (high != IWL_RATE_INVALID)
2454 high_tpt = tbl->win[high].average_tpt;
2455
2456 scale_action = 0;
2457
2458 /* Too many failures, decrease rate */
2459 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2460 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2461 scale_action = -1;
2462
2463 /* No throughput measured yet for adjacent rates; try increase. */
2464 } else if ((low_tpt == IWL_INVALID_VALUE) &&
2465 (high_tpt == IWL_INVALID_VALUE)) {
2466
2467 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2468 scale_action = 1;
2469 else if (low != IWL_RATE_INVALID)
2470 scale_action = 0;
2471 }
2472
2473 /* Both adjacent throughputs are measured, but neither one has better
2474 * throughput; we're using the best rate, don't change it! */
2475 else if ((low_tpt != IWL_INVALID_VALUE) &&
2476 (high_tpt != IWL_INVALID_VALUE) &&
2477 (low_tpt < current_tpt) &&
2478 (high_tpt < current_tpt))
2479 scale_action = 0;
2480
2481 /* At least one adjacent rate's throughput is measured,
2482 * and may have better performance. */
2483 else {
2484 /* Higher adjacent rate's throughput is measured */
2485 if (high_tpt != IWL_INVALID_VALUE) {
2486 /* Higher rate has better throughput */
2487 if (high_tpt > current_tpt &&
2488 sr >= IWL_RATE_INCREASE_TH) {
2489 scale_action = 1;
2490 } else {
2491 scale_action = 0;
2492 }
2493
2494 /* Lower adjacent rate's throughput is measured */
2495 } else if (low_tpt != IWL_INVALID_VALUE) {
2496 /* Lower rate has better throughput */
2497 if (low_tpt > current_tpt) {
2498 IWL_DEBUG_RATE(priv,
2499 "decrease rate because of low tpt\n");
2500 scale_action = -1;
2501 } else if (sr >= IWL_RATE_INCREASE_TH) {
2502 scale_action = 1;
2503 }
2504 }
2505 }
2506
2507 /* Sanity check; asked for decrease, but success rate or throughput
2508 * has been good at old rate. Don't change it. */
2509 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2510 ((sr > IWL_RATE_HIGH_TH) ||
2511 (current_tpt > (100 * tbl->expected_tpt[low]))))
2512 scale_action = 0;
2513 if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2514 scale_action = -1;
2515 if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
2516 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2517 scale_action = -1;
2518
2519 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2520 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2521 if (lq_sta->last_bt_traffic > priv->bt_traffic_load) {
2522 /*
2523 * don't set scale_action, don't want to scale up if
2524 * the rate scale doesn't otherwise think that is a
2525 * good idea.
2526 */
2527 } else if (lq_sta->last_bt_traffic <= priv->bt_traffic_load) {
2528 scale_action = -1;
2529 }
2530 }
2531 lq_sta->last_bt_traffic = priv->bt_traffic_load;
2532
2533 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2534 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2535 /* search for a new modulation */
2536 rs_stay_in_table(lq_sta, true);
2537 goto lq_update;
2538 }
2539
2540 switch (scale_action) {
2541 case -1:
2542 /* Decrease starting rate, update uCode's rate table */
2543 if (low != IWL_RATE_INVALID) {
2544 update_lq = 1;
2545 index = low;
2546 }
2547
2548 break;
2549 case 1:
2550 /* Increase starting rate, update uCode's rate table */
2551 if (high != IWL_RATE_INVALID) {
2552 update_lq = 1;
2553 index = high;
2554 }
2555
2556 break;
2557 case 0:
2558 /* No change */
2559 default:
2560 break;
2561 }
2562
2563 IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2564 "high %d type %d\n",
2565 index, scale_action, low, high, tbl->lq_type);
2566
2567 lq_update:
2568 /* Replace uCode's rate table for the destination station. */
2569 if (update_lq)
2570 rs_update_rate_tbl(priv, ctx, lq_sta, tbl, index, is_green);
2571
2572 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
2573 /* Should we stay with this modulation mode,
2574 * or search for a new one? */
2575 rs_stay_in_table(lq_sta, false);
2576 }
2577 /*
2578 * Search for new modulation mode if we're:
2579 * 1) Not changing rates right now
2580 * 2) Not just finishing up a search
2581 * 3) Allowing a new search
2582 */
2583 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2584 /* Save current throughput to compare with "search" throughput*/
2585 lq_sta->last_tpt = current_tpt;
2586
2587 /* Select a new "search" modulation mode to try.
2588 * If one is found, set up the new "search" table. */
2589 if (is_legacy(tbl->lq_type))
2590 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2591 else if (is_siso(tbl->lq_type))
2592 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2593 else if (is_mimo2(tbl->lq_type))
2594 rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2595 else
2596 rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2597
2598 /* If new "search" mode was selected, set up in uCode table */
2599 if (lq_sta->search_better_tbl) {
2600 /* Access the "search" table, clear its history. */
2601 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2602 for (i = 0; i < IWL_RATE_COUNT; i++)
2603 rs_rate_scale_clear_window(&(tbl->win[i]));
2604
2605 /* Use new "search" start rate */
2606 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2607
2608 IWL_DEBUG_RATE(priv, "Switch current mcs: %X index: %d\n",
2609 tbl->current_rate, index);
2610 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2611 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2612 } else
2613 done_search = 1;
2614 }
2615
2616 if (done_search && !lq_sta->stay_in_tbl) {
2617 /* If the "active" (non-search) mode was legacy,
2618 * and we've tried switching antennas,
2619 * but we haven't been able to try HT modes (not available),
2620 * stay with best antenna legacy modulation for a while
2621 * before next round of mode comparisons. */
2622 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2623 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2624 lq_sta->action_counter > tbl1->max_search) {
2625 IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2626 rs_set_stay_in_table(priv, 1, lq_sta);
2627 }
2628
2629 /* If we're in an HT mode, and all 3 mode switch actions
2630 * have been tried and compared, stay in this best modulation
2631 * mode for a while before next round of mode comparisons. */
2632 if (lq_sta->enable_counter &&
2633 (lq_sta->action_counter >= tbl1->max_search) &&
2634 iwl_ht_enabled(priv)) {
2635 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2636 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2637 (tid != MAX_TID_COUNT)) {
2638 tid_data =
2639 &priv->stations[lq_sta->lq.sta_id].tid[tid];
2640 if (tid_data->agg.state == IWL_AGG_OFF) {
2641 IWL_DEBUG_RATE(priv,
2642 "try to aggregate tid %d\n",
2643 tid);
2644 rs_tl_turn_on_agg(priv, tid,
2645 lq_sta, sta);
2646 }
2647 }
2648 rs_set_stay_in_table(priv, 0, lq_sta);
2649 }
2650 }
2651
2652 out:
2653 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2654 i = index;
2655 lq_sta->last_txrate_idx = i;
2656 }
2657
2658 /**
2659 * rs_initialize_lq - Initialize a station's hardware rate table
2660 *
2661 * The uCode's station table contains a table of fallback rates
2662 * for automatic fallback during transmission.
2663 *
2664 * NOTE: This sets up a default set of values. These will be replaced later
2665 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2666 * rc80211_simple.
2667 *
2668 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2669 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2670 * which requires station table entry to exist).
2671 */
2672 static void rs_initialize_lq(struct iwl_priv *priv,
2673 struct ieee80211_conf *conf,
2674 struct ieee80211_sta *sta,
2675 struct iwl_lq_sta *lq_sta)
2676 {
2677 struct iwl_scale_tbl_info *tbl;
2678 int rate_idx;
2679 int i;
2680 u32 rate;
2681 u8 use_green = rs_use_green(sta);
2682 u8 active_tbl = 0;
2683 u8 valid_tx_ant;
2684 struct iwl_station_priv *sta_priv;
2685 struct iwl_rxon_context *ctx;
2686
2687 if (!sta || !lq_sta)
2688 return;
2689
2690 sta_priv = (void *)sta->drv_priv;
2691 ctx = sta_priv->common.ctx;
2692
2693 i = lq_sta->last_txrate_idx;
2694
2695 valid_tx_ant = priv->hw_params.valid_tx_ant;
2696
2697 if (!lq_sta->search_better_tbl)
2698 active_tbl = lq_sta->active_tbl;
2699 else
2700 active_tbl = 1 - lq_sta->active_tbl;
2701
2702 tbl = &(lq_sta->lq_info[active_tbl]);
2703
2704 if ((i < 0) || (i >= IWL_RATE_COUNT))
2705 i = 0;
2706
2707 rate = iwl_rates[i].plcp;
2708 tbl->ant_type = first_antenna(valid_tx_ant);
2709 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2710
2711 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2712 rate |= RATE_MCS_CCK_MSK;
2713
2714 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2715 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2716 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2717
2718 rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2719 tbl->current_rate = rate;
2720 rs_set_expected_tpt_table(lq_sta, tbl);
2721 rs_fill_link_cmd(NULL, lq_sta, rate);
2722 priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2723 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_SYNC, true);
2724 }
2725
2726 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2727 struct ieee80211_tx_rate_control *txrc)
2728 {
2729
2730 struct sk_buff *skb = txrc->skb;
2731 struct ieee80211_supported_band *sband = txrc->sband;
2732 struct iwl_priv *priv __maybe_unused = (struct iwl_priv *)priv_r;
2733 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2734 struct iwl_lq_sta *lq_sta = priv_sta;
2735 int rate_idx;
2736
2737 IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2738
2739 /* Get max rate if user set max rate */
2740 if (lq_sta) {
2741 lq_sta->max_rate_idx = txrc->max_rate_idx;
2742 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2743 (lq_sta->max_rate_idx != -1))
2744 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2745 if ((lq_sta->max_rate_idx < 0) ||
2746 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2747 lq_sta->max_rate_idx = -1;
2748 }
2749
2750 /* Treat uninitialized rate scaling data same as non-existing. */
2751 if (lq_sta && !lq_sta->drv) {
2752 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
2753 priv_sta = NULL;
2754 }
2755
2756 /* Send management frames and NO_ACK data using lowest rate. */
2757 if (rate_control_send_low(sta, priv_sta, txrc))
2758 return;
2759
2760 rate_idx = lq_sta->last_txrate_idx;
2761
2762 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2763 rate_idx -= IWL_FIRST_OFDM_RATE;
2764 /* 6M and 9M shared same MCS index */
2765 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2766 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2767 IWL_RATE_MIMO3_6M_PLCP)
2768 rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2769 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2770 IWL_RATE_MIMO2_6M_PLCP)
2771 rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2772 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2773 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2774 info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2775 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2776 info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
2777 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2778 info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2779 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2780 info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2781 } else {
2782 /* Check for invalid rates */
2783 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2784 ((sband->band == IEEE80211_BAND_5GHZ) &&
2785 (rate_idx < IWL_FIRST_OFDM_RATE)))
2786 rate_idx = rate_lowest_index(sband, sta);
2787 /* On valid 5 GHz rate, adjust index */
2788 else if (sband->band == IEEE80211_BAND_5GHZ)
2789 rate_idx -= IWL_FIRST_OFDM_RATE;
2790 info->control.rates[0].flags = 0;
2791 }
2792 info->control.rates[0].idx = rate_idx;
2793
2794 }
2795
2796 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2797 gfp_t gfp)
2798 {
2799 struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2800 struct iwl_priv *priv;
2801
2802 priv = (struct iwl_priv *)priv_rate;
2803 IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2804
2805 return &sta_priv->lq_sta;
2806 }
2807
2808 /*
2809 * Called after adding a new station to initialize rate scaling
2810 */
2811 void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id)
2812 {
2813 int i, j;
2814 struct ieee80211_hw *hw = priv->hw;
2815 struct ieee80211_conf *conf = &priv->hw->conf;
2816 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2817 struct iwl_station_priv *sta_priv;
2818 struct iwl_lq_sta *lq_sta;
2819 struct ieee80211_supported_band *sband;
2820
2821 sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2822 lq_sta = &sta_priv->lq_sta;
2823 sband = hw->wiphy->bands[conf->channel->band];
2824
2825
2826 lq_sta->lq.sta_id = sta_id;
2827
2828 for (j = 0; j < LQ_SIZE; j++)
2829 for (i = 0; i < IWL_RATE_COUNT; i++)
2830 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2831
2832 lq_sta->flush_timer = 0;
2833 lq_sta->supp_rates = sta->supp_rates[sband->band];
2834 for (j = 0; j < LQ_SIZE; j++)
2835 for (i = 0; i < IWL_RATE_COUNT; i++)
2836 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2837
2838 IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n",
2839 sta_id);
2840 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2841 * the lowest or the highest rate.. Could consider using RSSI from
2842 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2843 * after assoc.. */
2844
2845 lq_sta->is_dup = 0;
2846 lq_sta->max_rate_idx = -1;
2847 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2848 lq_sta->is_green = rs_use_green(sta);
2849 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2850 lq_sta->band = priv->band;
2851 /*
2852 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2853 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2854 */
2855 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2856 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2857 lq_sta->active_siso_rate &= ~((u16)0x2);
2858 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2859
2860 /* Same here */
2861 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2862 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2863 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2864 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2865
2866 lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2867 lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2868 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2869 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2870
2871 IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2872 lq_sta->active_siso_rate,
2873 lq_sta->active_mimo2_rate,
2874 lq_sta->active_mimo3_rate);
2875
2876 /* These values will be overridden later */
2877 lq_sta->lq.general_params.single_stream_ant_msk =
2878 first_antenna(priv->hw_params.valid_tx_ant);
2879 lq_sta->lq.general_params.dual_stream_ant_msk =
2880 priv->hw_params.valid_tx_ant &
2881 ~first_antenna(priv->hw_params.valid_tx_ant);
2882 if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2883 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2884 } else if (num_of_ant(priv->hw_params.valid_tx_ant) == 2) {
2885 lq_sta->lq.general_params.dual_stream_ant_msk =
2886 priv->hw_params.valid_tx_ant;
2887 }
2888
2889 /* as default allow aggregation for all tids */
2890 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2891 lq_sta->drv = priv;
2892
2893 /* Set last_txrate_idx to lowest rate */
2894 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2895 if (sband->band == IEEE80211_BAND_5GHZ)
2896 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2897 lq_sta->is_agg = 0;
2898
2899 priv->dbg_fixed_rate = 0;
2900 #ifdef CONFIG_MAC80211_DEBUGFS
2901 lq_sta->dbg_fixed_rate = 0;
2902 #endif
2903
2904 rs_initialize_lq(priv, conf, sta, lq_sta);
2905 }
2906
2907 static void rs_fill_link_cmd(struct iwl_priv *priv,
2908 struct iwl_lq_sta *lq_sta, u32 new_rate)
2909 {
2910 struct iwl_scale_tbl_info tbl_type;
2911 int index = 0;
2912 int rate_idx;
2913 int repeat_rate = 0;
2914 u8 ant_toggle_cnt = 0;
2915 u8 use_ht_possible = 1;
2916 u8 valid_tx_ant = 0;
2917 struct iwl_station_priv *sta_priv =
2918 container_of(lq_sta, struct iwl_station_priv, lq_sta);
2919 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2920
2921 /* Override starting rate (index 0) if needed for debug purposes */
2922 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2923
2924 /* Interpret new_rate (rate_n_flags) */
2925 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2926 &tbl_type, &rate_idx);
2927
2928 if (priv && priv->bt_full_concurrent) {
2929 /* 1x1 only */
2930 tbl_type.ant_type =
2931 first_antenna(priv->hw_params.valid_tx_ant);
2932 }
2933
2934 /* How many times should we repeat the initial rate? */
2935 if (is_legacy(tbl_type.lq_type)) {
2936 ant_toggle_cnt = 1;
2937 repeat_rate = IWL_NUMBER_TRY;
2938 } else {
2939 repeat_rate = min(IWL_HT_NUMBER_TRY,
2940 LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2941 }
2942
2943 lq_cmd->general_params.mimo_delimiter =
2944 is_mimo(tbl_type.lq_type) ? 1 : 0;
2945
2946 /* Fill 1st table entry (index 0) */
2947 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2948
2949 if (num_of_ant(tbl_type.ant_type) == 1) {
2950 lq_cmd->general_params.single_stream_ant_msk =
2951 tbl_type.ant_type;
2952 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2953 lq_cmd->general_params.dual_stream_ant_msk =
2954 tbl_type.ant_type;
2955 } /* otherwise we don't modify the existing value */
2956
2957 index++;
2958 repeat_rate--;
2959 if (priv) {
2960 if (priv->bt_full_concurrent)
2961 valid_tx_ant = ANT_A;
2962 else
2963 valid_tx_ant = priv->hw_params.valid_tx_ant;
2964 }
2965
2966 /* Fill rest of rate table */
2967 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2968 /* Repeat initial/next rate.
2969 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2970 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2971 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2972 if (is_legacy(tbl_type.lq_type)) {
2973 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2974 ant_toggle_cnt++;
2975 else if (priv &&
2976 rs_toggle_antenna(valid_tx_ant,
2977 &new_rate, &tbl_type))
2978 ant_toggle_cnt = 1;
2979 }
2980
2981 /* Override next rate if needed for debug purposes */
2982 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2983
2984 /* Fill next table entry */
2985 lq_cmd->rs_table[index].rate_n_flags =
2986 cpu_to_le32(new_rate);
2987 repeat_rate--;
2988 index++;
2989 }
2990
2991 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2992 &rate_idx);
2993
2994 if (priv && priv->bt_full_concurrent) {
2995 /* 1x1 only */
2996 tbl_type.ant_type =
2997 first_antenna(priv->hw_params.valid_tx_ant);
2998 }
2999
3000 /* Indicate to uCode which entries might be MIMO.
3001 * If initial rate was MIMO, this will finally end up
3002 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
3003 if (is_mimo(tbl_type.lq_type))
3004 lq_cmd->general_params.mimo_delimiter = index;
3005
3006 /* Get next rate */
3007 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
3008 use_ht_possible);
3009
3010 /* How many times should we repeat the next rate? */
3011 if (is_legacy(tbl_type.lq_type)) {
3012 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
3013 ant_toggle_cnt++;
3014 else if (priv &&
3015 rs_toggle_antenna(valid_tx_ant,
3016 &new_rate, &tbl_type))
3017 ant_toggle_cnt = 1;
3018
3019 repeat_rate = IWL_NUMBER_TRY;
3020 } else {
3021 repeat_rate = IWL_HT_NUMBER_TRY;
3022 }
3023
3024 /* Don't allow HT rates after next pass.
3025 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
3026 use_ht_possible = 0;
3027
3028 /* Override next rate if needed for debug purposes */
3029 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
3030
3031 /* Fill next table entry */
3032 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
3033
3034 index++;
3035 repeat_rate--;
3036 }
3037
3038 lq_cmd->agg_params.agg_frame_cnt_limit =
3039 sta_priv->max_agg_bufsize ?: LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3040 lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
3041
3042 lq_cmd->agg_params.agg_time_limit =
3043 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
3044 /*
3045 * overwrite if needed, pass aggregation time limit
3046 * to uCode in uSec
3047 */
3048 if (priv && priv->cfg->bt_params &&
3049 priv->cfg->bt_params->agg_time_limit &&
3050 priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH)
3051 lq_cmd->agg_params.agg_time_limit =
3052 cpu_to_le16(priv->cfg->bt_params->agg_time_limit);
3053 }
3054
3055 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3056 {
3057 return hw->priv;
3058 }
3059 /* rate scale requires free function to be implemented */
3060 static void rs_free(void *priv_rate)
3061 {
3062 return;
3063 }
3064
3065 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
3066 void *priv_sta)
3067 {
3068 struct iwl_priv *priv __maybe_unused = priv_r;
3069
3070 IWL_DEBUG_RATE(priv, "enter\n");
3071 IWL_DEBUG_RATE(priv, "leave\n");
3072 }
3073
3074 #ifdef CONFIG_MAC80211_DEBUGFS
3075 static int open_file_generic(struct inode *inode, struct file *file)
3076 {
3077 file->private_data = inode->i_private;
3078 return 0;
3079 }
3080 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
3081 u32 *rate_n_flags, int index)
3082 {
3083 struct iwl_priv *priv;
3084 u8 valid_tx_ant;
3085 u8 ant_sel_tx;
3086
3087 priv = lq_sta->drv;
3088 valid_tx_ant = priv->hw_params.valid_tx_ant;
3089 if (lq_sta->dbg_fixed_rate) {
3090 ant_sel_tx =
3091 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
3092 >> RATE_MCS_ANT_POS);
3093 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
3094 *rate_n_flags = lq_sta->dbg_fixed_rate;
3095 IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
3096 } else {
3097 lq_sta->dbg_fixed_rate = 0;
3098 priv->dbg_fixed_rate = 0;
3099 IWL_ERR(priv,
3100 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
3101 ant_sel_tx, valid_tx_ant);
3102 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3103 }
3104 } else {
3105 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3106 }
3107 }
3108
3109 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3110 const char __user *user_buf, size_t count, loff_t *ppos)
3111 {
3112 struct iwl_lq_sta *lq_sta = file->private_data;
3113 struct iwl_priv *priv;
3114 char buf[64];
3115 size_t buf_size;
3116 u32 parsed_rate;
3117
3118
3119 priv = lq_sta->drv;
3120 memset(buf, 0, sizeof(buf));
3121 buf_size = min(count, sizeof(buf) - 1);
3122 if (copy_from_user(buf, user_buf, buf_size))
3123 return -EFAULT;
3124
3125 if (sscanf(buf, "%x", &parsed_rate) == 1)
3126 priv->dbg_fixed_rate = lq_sta->dbg_fixed_rate = parsed_rate;
3127 else
3128 priv->dbg_fixed_rate = lq_sta->dbg_fixed_rate = 0;
3129
3130 rs_program_fix_rate(priv, lq_sta);
3131
3132 return count;
3133 }
3134
3135 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3136 char __user *user_buf, size_t count, loff_t *ppos)
3137 {
3138 char *buff;
3139 int desc = 0;
3140 int i = 0;
3141 int index = 0;
3142 ssize_t ret;
3143
3144 struct iwl_lq_sta *lq_sta = file->private_data;
3145 struct iwl_priv *priv;
3146 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3147
3148 priv = lq_sta->drv;
3149 buff = kmalloc(1024, GFP_KERNEL);
3150 if (!buff)
3151 return -ENOMEM;
3152
3153 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3154 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
3155 lq_sta->total_failed, lq_sta->total_success,
3156 lq_sta->active_legacy_rate);
3157 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3158 priv->dbg_fixed_rate);
3159 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3160 (priv->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
3161 (priv->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
3162 (priv->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
3163 desc += sprintf(buff+desc, "lq type %s\n",
3164 (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
3165 if (is_Ht(tbl->lq_type)) {
3166 desc += sprintf(buff+desc, " %s",
3167 (is_siso(tbl->lq_type)) ? "SISO" :
3168 ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
3169 desc += sprintf(buff+desc, " %s",
3170 (tbl->is_ht40) ? "40MHz" : "20MHz");
3171 desc += sprintf(buff+desc, " %s %s %s\n", (tbl->is_SGI) ? "SGI" : "",
3172 (lq_sta->is_green) ? "GF enabled" : "",
3173 (lq_sta->is_agg) ? "AGG on" : "");
3174 }
3175 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3176 lq_sta->last_rate_n_flags);
3177 desc += sprintf(buff+desc, "general:"
3178 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
3179 lq_sta->lq.general_params.flags,
3180 lq_sta->lq.general_params.mimo_delimiter,
3181 lq_sta->lq.general_params.single_stream_ant_msk,
3182 lq_sta->lq.general_params.dual_stream_ant_msk);
3183
3184 desc += sprintf(buff+desc, "agg:"
3185 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3186 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
3187 lq_sta->lq.agg_params.agg_dis_start_th,
3188 lq_sta->lq.agg_params.agg_frame_cnt_limit);
3189
3190 desc += sprintf(buff+desc,
3191 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3192 lq_sta->lq.general_params.start_rate_index[0],
3193 lq_sta->lq.general_params.start_rate_index[1],
3194 lq_sta->lq.general_params.start_rate_index[2],
3195 lq_sta->lq.general_params.start_rate_index[3]);
3196
3197 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3198 index = iwl_hwrate_to_plcp_idx(
3199 le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
3200 if (is_legacy(tbl->lq_type)) {
3201 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
3202 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3203 iwl_rate_mcs[index].mbps);
3204 } else {
3205 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
3206 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3207 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
3208 }
3209 }
3210
3211 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3212 kfree(buff);
3213 return ret;
3214 }
3215
3216 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3217 .write = rs_sta_dbgfs_scale_table_write,
3218 .read = rs_sta_dbgfs_scale_table_read,
3219 .open = open_file_generic,
3220 .llseek = default_llseek,
3221 };
3222 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3223 char __user *user_buf, size_t count, loff_t *ppos)
3224 {
3225 char *buff;
3226 int desc = 0;
3227 int i, j;
3228 ssize_t ret;
3229
3230 struct iwl_lq_sta *lq_sta = file->private_data;
3231
3232 buff = kmalloc(1024, GFP_KERNEL);
3233 if (!buff)
3234 return -ENOMEM;
3235
3236 for (i = 0; i < LQ_SIZE; i++) {
3237 desc += sprintf(buff+desc,
3238 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
3239 "rate=0x%X\n",
3240 lq_sta->active_tbl == i ? "*" : "x",
3241 lq_sta->lq_info[i].lq_type,
3242 lq_sta->lq_info[i].is_SGI,
3243 lq_sta->lq_info[i].is_ht40,
3244 lq_sta->lq_info[i].is_dup,
3245 lq_sta->is_green,
3246 lq_sta->lq_info[i].current_rate);
3247 for (j = 0; j < IWL_RATE_COUNT; j++) {
3248 desc += sprintf(buff+desc,
3249 "counter=%d success=%d %%=%d\n",
3250 lq_sta->lq_info[i].win[j].counter,
3251 lq_sta->lq_info[i].win[j].success_counter,
3252 lq_sta->lq_info[i].win[j].success_ratio);
3253 }
3254 }
3255 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3256 kfree(buff);
3257 return ret;
3258 }
3259
3260 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3261 .read = rs_sta_dbgfs_stats_table_read,
3262 .open = open_file_generic,
3263 .llseek = default_llseek,
3264 };
3265
3266 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3267 char __user *user_buf, size_t count, loff_t *ppos)
3268 {
3269 struct iwl_lq_sta *lq_sta = file->private_data;
3270 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3271 char buff[120];
3272 int desc = 0;
3273
3274 if (is_Ht(tbl->lq_type))
3275 desc += sprintf(buff+desc,
3276 "Bit Rate= %d Mb/s\n",
3277 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3278 else
3279 desc += sprintf(buff+desc,
3280 "Bit Rate= %d Mb/s\n",
3281 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3282
3283 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3284 }
3285
3286 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3287 .read = rs_sta_dbgfs_rate_scale_data_read,
3288 .open = open_file_generic,
3289 .llseek = default_llseek,
3290 };
3291
3292 static void rs_add_debugfs(void *priv, void *priv_sta,
3293 struct dentry *dir)
3294 {
3295 struct iwl_lq_sta *lq_sta = priv_sta;
3296 lq_sta->rs_sta_dbgfs_scale_table_file =
3297 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3298 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3299 lq_sta->rs_sta_dbgfs_stats_table_file =
3300 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3301 lq_sta, &rs_sta_dbgfs_stats_table_ops);
3302 lq_sta->rs_sta_dbgfs_rate_scale_data_file =
3303 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
3304 lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
3305 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
3306 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3307 &lq_sta->tx_agg_tid_en);
3308
3309 }
3310
3311 static void rs_remove_debugfs(void *priv, void *priv_sta)
3312 {
3313 struct iwl_lq_sta *lq_sta = priv_sta;
3314 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3315 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
3316 debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
3317 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
3318 }
3319 #endif
3320
3321 /*
3322 * Initialization of rate scaling information is done by driver after
3323 * the station is added. Since mac80211 calls this function before a
3324 * station is added we ignore it.
3325 */
3326 static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband,
3327 struct ieee80211_sta *sta, void *priv_sta)
3328 {
3329 }
3330 static struct rate_control_ops rs_ops = {
3331 .module = NULL,
3332 .name = RS_NAME,
3333 .tx_status = rs_tx_status,
3334 .get_rate = rs_get_rate,
3335 .rate_init = rs_rate_init_stub,
3336 .alloc = rs_alloc,
3337 .free = rs_free,
3338 .alloc_sta = rs_alloc_sta,
3339 .free_sta = rs_free_sta,
3340 #ifdef CONFIG_MAC80211_DEBUGFS
3341 .add_sta_debugfs = rs_add_debugfs,
3342 .remove_sta_debugfs = rs_remove_debugfs,
3343 #endif
3344 };
3345
3346 int iwlagn_rate_control_register(void)
3347 {
3348 return ieee80211_rate_control_register(&rs_ops);
3349 }
3350
3351 void iwlagn_rate_control_unregister(void)
3352 {
3353 ieee80211_rate_control_unregister(&rs_ops);
3354 }
3355
kernel source for telekom puls (alcatel/mediatek)