projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
iwlwifi: remove CMD_SYNC
[deliverable/linux.git] / drivers / net / wireless / iwlwifi / dvm / rs.c
1 /******************************************************************************
2 *
3 * Copyright(c) 2005 - 2014 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/skbuff.h>
28 #include <linux/slab.h>
29 #include <net/mac80211.h>
30
31 #include <linux/netdevice.h>
32 #include <linux/etherdevice.h>
33 #include <linux/delay.h>
34
35 #include <linux/workqueue.h>
36
37 #include "dev.h"
38 #include "agn.h"
39
40 #define RS_NAME "iwl-agn-rs"
41
42 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
43 #define IWL_NUMBER_TRY 1
44 #define IWL_HT_NUMBER_TRY 3
45
46 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
47 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
48 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
49
50 /* max allowed rate miss before sync LQ cmd */
51 #define IWL_MISSED_RATE_MAX 15
52 /* max time to accum history 2 seconds */
53 #define IWL_RATE_SCALE_FLUSH_INTVL (3*HZ)
54
55 static u8 rs_ht_to_legacy[] = {
56 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
57 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
58 IWL_RATE_6M_INDEX,
59 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
60 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
61 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
62 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
63 };
64
65 static const u8 ant_toggle_lookup[] = {
66 /*ANT_NONE -> */ ANT_NONE,
67 /*ANT_A -> */ ANT_B,
68 /*ANT_B -> */ ANT_C,
69 /*ANT_AB -> */ ANT_BC,
70 /*ANT_C -> */ ANT_A,
71 /*ANT_AC -> */ ANT_AB,
72 /*ANT_BC -> */ ANT_AC,
73 /*ANT_ABC -> */ ANT_ABC,
74 };
75
76 #define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np) \
77 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
78 IWL_RATE_SISO_##s##M_PLCP, \
79 IWL_RATE_MIMO2_##s##M_PLCP,\
80 IWL_RATE_MIMO3_##s##M_PLCP,\
81 IWL_RATE_##r##M_IEEE, \
82 IWL_RATE_##ip##M_INDEX, \
83 IWL_RATE_##in##M_INDEX, \
84 IWL_RATE_##rp##M_INDEX, \
85 IWL_RATE_##rn##M_INDEX, \
86 IWL_RATE_##pp##M_INDEX, \
87 IWL_RATE_##np##M_INDEX }
88
89 /*
90 * Parameter order:
91 * rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
92 *
93 * If there isn't a valid next or previous rate then INV is used which
94 * maps to IWL_RATE_INVALID
95 *
96 */
97 const struct iwl_rate_info iwl_rates[IWL_RATE_COUNT] = {
98 IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2), /* 1mbps */
99 IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5), /* 2mbps */
100 IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11), /*5.5mbps */
101 IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18), /* 11mbps */
102 IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11), /* 6mbps */
103 IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11), /* 9mbps */
104 IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18), /* 12mbps */
105 IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24), /* 18mbps */
106 IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36), /* 24mbps */
107 IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48), /* 36mbps */
108 IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54), /* 48mbps */
109 IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
110 IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
111 /* FIXME:RS: ^^ should be INV (legacy) */
112 };
113
114 static inline u8 rs_extract_rate(u32 rate_n_flags)
115 {
116 return (u8)(rate_n_flags & RATE_MCS_RATE_MSK);
117 }
118
119 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
120 {
121 int idx = 0;
122
123 /* HT rate format */
124 if (rate_n_flags & RATE_MCS_HT_MSK) {
125 idx = rs_extract_rate(rate_n_flags);
126
127 if (idx >= IWL_RATE_MIMO3_6M_PLCP)
128 idx = idx - IWL_RATE_MIMO3_6M_PLCP;
129 else if (idx >= IWL_RATE_MIMO2_6M_PLCP)
130 idx = idx - IWL_RATE_MIMO2_6M_PLCP;
131
132 idx += IWL_FIRST_OFDM_RATE;
133 /* skip 9M not supported in ht*/
134 if (idx >= IWL_RATE_9M_INDEX)
135 idx += 1;
136 if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE))
137 return idx;
138
139 /* legacy rate format, search for match in table */
140 } else {
141 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
142 if (iwl_rates[idx].plcp ==
143 rs_extract_rate(rate_n_flags))
144 return idx;
145 }
146
147 return -1;
148 }
149
150 static void rs_rate_scale_perform(struct iwl_priv *priv,
151 struct sk_buff *skb,
152 struct ieee80211_sta *sta,
153 struct iwl_lq_sta *lq_sta);
154 static void rs_fill_link_cmd(struct iwl_priv *priv,
155 struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
156 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
157
158
159 #ifdef CONFIG_MAC80211_DEBUGFS
160 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
161 u32 *rate_n_flags, int index);
162 #else
163 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
164 u32 *rate_n_flags, int index)
165 {}
166 #endif
167
168 /**
169 * The following tables contain the expected throughput metrics for all rates
170 *
171 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
172 *
173 * where invalid entries are zeros.
174 *
175 * CCK rates are only valid in legacy table and will only be used in G
176 * (2.4 GHz) band.
177 */
178
179 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
180 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
181 };
182
183 static const u16 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
184 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202}, /* Norm */
185 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210}, /* SGI */
186 {0, 0, 0, 0, 47, 0, 91, 133, 171, 242, 305, 334, 362}, /* AGG */
187 {0, 0, 0, 0, 52, 0, 101, 145, 187, 264, 330, 361, 390}, /* AGG+SGI */
188 };
189
190 static const u16 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
191 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
192 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
193 {0, 0, 0, 0, 94, 0, 177, 249, 313, 423, 512, 550, 586}, /* AGG */
194 {0, 0, 0, 0, 104, 0, 193, 270, 338, 454, 545, 584, 620}, /* AGG+SGI */
195 };
196
197 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
198 {0, 0, 0, 0, 74, 0, 123, 155, 179, 214, 236, 244, 251}, /* Norm */
199 {0, 0, 0, 0, 81, 0, 131, 164, 188, 223, 243, 251, 257}, /* SGI */
200 {0, 0, 0, 0, 89, 0, 167, 235, 296, 402, 488, 526, 560}, /* AGG */
201 {0, 0, 0, 0, 97, 0, 182, 255, 320, 431, 520, 558, 593}, /* AGG+SGI*/
202 };
203
204 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
205 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
206 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
207 {0, 0, 0, 0, 171, 0, 305, 410, 496, 634, 731, 771, 805}, /* AGG */
208 {0, 0, 0, 0, 186, 0, 329, 439, 527, 667, 764, 803, 838}, /* AGG+SGI */
209 };
210
211 static const u16 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = {
212 {0, 0, 0, 0, 99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */
213 {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */
214 {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */
215 {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */
216 };
217
218 static const u16 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = {
219 {0, 0, 0, 0, 152, 0, 211, 239, 255, 279, 290, 294, 297}, /* Norm */
220 {0, 0, 0, 0, 160, 0, 219, 245, 261, 284, 294, 297, 300}, /* SGI */
221 {0, 0, 0, 0, 254, 0, 443, 584, 695, 868, 984, 1030, 1070}, /* AGG */
222 {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */
223 };
224
225 /* mbps, mcs */
226 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
227 { "1", "BPSK DSSS"},
228 { "2", "QPSK DSSS"},
229 {"5.5", "BPSK CCK"},
230 { "11", "QPSK CCK"},
231 { "6", "BPSK 1/2"},
232 { "9", "BPSK 1/2"},
233 { "12", "QPSK 1/2"},
234 { "18", "QPSK 3/4"},
235 { "24", "16QAM 1/2"},
236 { "36", "16QAM 3/4"},
237 { "48", "64QAM 2/3"},
238 { "54", "64QAM 3/4"},
239 { "60", "64QAM 5/6"},
240 };
241
242 #define MCS_INDEX_PER_STREAM (8)
243
244 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
245 {
246 window->data = 0;
247 window->success_counter = 0;
248 window->success_ratio = IWL_INVALID_VALUE;
249 window->counter = 0;
250 window->average_tpt = IWL_INVALID_VALUE;
251 window->stamp = 0;
252 }
253
254 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
255 {
256 return (ant_type & valid_antenna) == ant_type;
257 }
258
259 /*
260 * removes the old data from the statistics. All data that is older than
261 * TID_MAX_TIME_DIFF, will be deleted.
262 */
263 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
264 {
265 /* The oldest age we want to keep */
266 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
267
268 while (tl->queue_count &&
269 (tl->time_stamp < oldest_time)) {
270 tl->total -= tl->packet_count[tl->head];
271 tl->packet_count[tl->head] = 0;
272 tl->time_stamp += TID_QUEUE_CELL_SPACING;
273 tl->queue_count--;
274 tl->head++;
275 if (tl->head >= TID_QUEUE_MAX_SIZE)
276 tl->head = 0;
277 }
278 }
279
280 /*
281 * increment traffic load value for tid and also remove
282 * any old values if passed the certain time period
283 */
284 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
285 struct ieee80211_hdr *hdr)
286 {
287 u32 curr_time = jiffies_to_msecs(jiffies);
288 u32 time_diff;
289 s32 index;
290 struct iwl_traffic_load *tl = NULL;
291 u8 tid;
292
293 if (ieee80211_is_data_qos(hdr->frame_control)) {
294 u8 *qc = ieee80211_get_qos_ctl(hdr);
295 tid = qc[0] & 0xf;
296 } else
297 return IWL_MAX_TID_COUNT;
298
299 if (unlikely(tid >= IWL_MAX_TID_COUNT))
300 return IWL_MAX_TID_COUNT;
301
302 tl = &lq_data->load[tid];
303
304 curr_time -= curr_time % TID_ROUND_VALUE;
305
306 /* Happens only for the first packet. Initialize the data */
307 if (!(tl->queue_count)) {
308 tl->total = 1;
309 tl->time_stamp = curr_time;
310 tl->queue_count = 1;
311 tl->head = 0;
312 tl->packet_count[0] = 1;
313 return IWL_MAX_TID_COUNT;
314 }
315
316 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
317 index = time_diff / TID_QUEUE_CELL_SPACING;
318
319 /* The history is too long: remove data that is older than */
320 /* TID_MAX_TIME_DIFF */
321 if (index >= TID_QUEUE_MAX_SIZE)
322 rs_tl_rm_old_stats(tl, curr_time);
323
324 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
325 tl->packet_count[index] = tl->packet_count[index] + 1;
326 tl->total = tl->total + 1;
327
328 if ((index + 1) > tl->queue_count)
329 tl->queue_count = index + 1;
330
331 return tid;
332 }
333
334 #ifdef CONFIG_MAC80211_DEBUGFS
335 /**
336 * Program the device to use fixed rate for frame transmit
337 * This is for debugging/testing only
338 * once the device start use fixed rate, we need to reload the module
339 * to being back the normal operation.
340 */
341 static void rs_program_fix_rate(struct iwl_priv *priv,
342 struct iwl_lq_sta *lq_sta)
343 {
344 struct iwl_station_priv *sta_priv =
345 container_of(lq_sta, struct iwl_station_priv, lq_sta);
346 struct iwl_rxon_context *ctx = sta_priv->ctx;
347
348 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
349 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
350 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
351 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
352
353 IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
354 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
355
356 if (lq_sta->dbg_fixed_rate) {
357 rs_fill_link_cmd(NULL, lq_sta, lq_sta->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 >= IWL_MAX_TID_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_DEBUG_COEX(priv,
408 "BT traffic (%d), no aggregation allowed\n",
409 priv->bt_traffic_load);
410 return ret;
411 }
412
413 load = rs_tl_get_load(lq_data, tid);
414
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 return ret;
429 }
430
431 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
432 struct iwl_lq_sta *lq_data,
433 struct ieee80211_sta *sta)
434 {
435 if (tid < IWL_MAX_TID_COUNT)
436 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
437 else
438 IWL_ERR(priv, "tid exceeds max TID count: %d/%d\n",
439 tid, IWL_MAX_TID_COUNT);
440 }
441
442 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
443 {
444 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
445 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
446 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
447 }
448
449 /*
450 * Static function to get the expected throughput from an iwl_scale_tbl_info
451 * that wraps a NULL pointer check
452 */
453 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
454 {
455 if (tbl->expected_tpt)
456 return tbl->expected_tpt[rs_index];
457 return 0;
458 }
459
460 /**
461 * rs_collect_tx_data - Update the success/failure sliding window
462 *
463 * We keep a sliding window of the last 62 packets transmitted
464 * at this rate. window->data contains the bitmask of successful
465 * packets.
466 */
467 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
468 int scale_index, int attempts, int successes)
469 {
470 struct iwl_rate_scale_data *window = NULL;
471 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
472 s32 fail_count, tpt;
473
474 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
475 return -EINVAL;
476
477 /* Select window for current tx bit rate */
478 window = &(tbl->win[scale_index]);
479
480 /* Get expected throughput */
481 tpt = get_expected_tpt(tbl, scale_index);
482
483 /*
484 * Keep track of only the latest 62 tx frame attempts in this rate's
485 * history window; anything older isn't really relevant any more.
486 * If we have filled up the sliding window, drop the oldest attempt;
487 * if the oldest attempt (highest bit in bitmap) shows "success",
488 * subtract "1" from the success counter (this is the main reason
489 * we keep these bitmaps!).
490 */
491 while (attempts > 0) {
492 if (window->counter >= IWL_RATE_MAX_WINDOW) {
493
494 /* remove earliest */
495 window->counter = IWL_RATE_MAX_WINDOW - 1;
496
497 if (window->data & mask) {
498 window->data &= ~mask;
499 window->success_counter--;
500 }
501 }
502
503 /* Increment frames-attempted counter */
504 window->counter++;
505
506 /* Shift bitmap by one frame to throw away oldest history */
507 window->data <<= 1;
508
509 /* Mark the most recent #successes attempts as successful */
510 if (successes > 0) {
511 window->success_counter++;
512 window->data |= 0x1;
513 successes--;
514 }
515
516 attempts--;
517 }
518
519 /* Calculate current success ratio, avoid divide-by-0! */
520 if (window->counter > 0)
521 window->success_ratio = 128 * (100 * window->success_counter)
522 / window->counter;
523 else
524 window->success_ratio = IWL_INVALID_VALUE;
525
526 fail_count = window->counter - window->success_counter;
527
528 /* Calculate average throughput, if we have enough history. */
529 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
530 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
531 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
532 else
533 window->average_tpt = IWL_INVALID_VALUE;
534
535 /* Tag this window as having been updated */
536 window->stamp = jiffies;
537
538 return 0;
539 }
540
541 /*
542 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
543 */
544 /* FIXME:RS:remove this function and put the flags statically in the table */
545 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
546 struct iwl_scale_tbl_info *tbl,
547 int index, u8 use_green)
548 {
549 u32 rate_n_flags = 0;
550
551 if (is_legacy(tbl->lq_type)) {
552 rate_n_flags = iwl_rates[index].plcp;
553 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
554 rate_n_flags |= RATE_MCS_CCK_MSK;
555
556 } else if (is_Ht(tbl->lq_type)) {
557 if (index > IWL_LAST_OFDM_RATE) {
558 IWL_ERR(priv, "Invalid HT rate index %d\n", index);
559 index = IWL_LAST_OFDM_RATE;
560 }
561 rate_n_flags = RATE_MCS_HT_MSK;
562
563 if (is_siso(tbl->lq_type))
564 rate_n_flags |= iwl_rates[index].plcp_siso;
565 else if (is_mimo2(tbl->lq_type))
566 rate_n_flags |= iwl_rates[index].plcp_mimo2;
567 else
568 rate_n_flags |= iwl_rates[index].plcp_mimo3;
569 } else {
570 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
571 }
572
573 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
574 RATE_MCS_ANT_ABC_MSK);
575
576 if (is_Ht(tbl->lq_type)) {
577 if (tbl->is_ht40) {
578 if (tbl->is_dup)
579 rate_n_flags |= RATE_MCS_DUP_MSK;
580 else
581 rate_n_flags |= RATE_MCS_HT40_MSK;
582 }
583 if (tbl->is_SGI)
584 rate_n_flags |= RATE_MCS_SGI_MSK;
585
586 if (use_green) {
587 rate_n_flags |= RATE_MCS_GF_MSK;
588 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
589 rate_n_flags &= ~RATE_MCS_SGI_MSK;
590 IWL_ERR(priv, "GF was set with SGI:SISO\n");
591 }
592 }
593 }
594 return rate_n_flags;
595 }
596
597 /*
598 * Interpret uCode API's rate_n_flags format,
599 * fill "search" or "active" tx mode table.
600 */
601 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
602 enum ieee80211_band band,
603 struct iwl_scale_tbl_info *tbl,
604 int *rate_idx)
605 {
606 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
607 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
608 u8 mcs;
609
610 memset(tbl, 0, sizeof(struct iwl_scale_tbl_info));
611 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
612
613 if (*rate_idx == IWL_RATE_INVALID) {
614 *rate_idx = -1;
615 return -EINVAL;
616 }
617 tbl->is_SGI = 0; /* default legacy setup */
618 tbl->is_ht40 = 0;
619 tbl->is_dup = 0;
620 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
621 tbl->lq_type = LQ_NONE;
622 tbl->max_search = IWL_MAX_SEARCH;
623
624 /* legacy rate format */
625 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
626 if (num_of_ant == 1) {
627 if (band == IEEE80211_BAND_5GHZ)
628 tbl->lq_type = LQ_A;
629 else
630 tbl->lq_type = LQ_G;
631 }
632 /* HT rate format */
633 } else {
634 if (rate_n_flags & RATE_MCS_SGI_MSK)
635 tbl->is_SGI = 1;
636
637 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
638 (rate_n_flags & RATE_MCS_DUP_MSK))
639 tbl->is_ht40 = 1;
640
641 if (rate_n_flags & RATE_MCS_DUP_MSK)
642 tbl->is_dup = 1;
643
644 mcs = rs_extract_rate(rate_n_flags);
645
646 /* SISO */
647 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
648 if (num_of_ant == 1)
649 tbl->lq_type = LQ_SISO; /*else NONE*/
650 /* MIMO2 */
651 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
652 if (num_of_ant == 2)
653 tbl->lq_type = LQ_MIMO2;
654 /* MIMO3 */
655 } else {
656 if (num_of_ant == 3) {
657 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
658 tbl->lq_type = LQ_MIMO3;
659 }
660 }
661 }
662 return 0;
663 }
664
665 /* switch to another antenna/antennas and return 1 */
666 /* if no other valid antenna found, return 0 */
667 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
668 struct iwl_scale_tbl_info *tbl)
669 {
670 u8 new_ant_type;
671
672 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
673 return 0;
674
675 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
676 return 0;
677
678 new_ant_type = ant_toggle_lookup[tbl->ant_type];
679
680 while ((new_ant_type != tbl->ant_type) &&
681 !rs_is_valid_ant(valid_ant, new_ant_type))
682 new_ant_type = ant_toggle_lookup[new_ant_type];
683
684 if (new_ant_type == tbl->ant_type)
685 return 0;
686
687 tbl->ant_type = new_ant_type;
688 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
689 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
690 return 1;
691 }
692
693 /**
694 * Green-field mode is valid if the station supports it and
695 * there are no non-GF stations present in the BSS.
696 */
697 static bool rs_use_green(struct ieee80211_sta *sta)
698 {
699 /*
700 * There's a bug somewhere in this code that causes the
701 * scaling to get stuck because GF+SGI can't be combined
702 * in SISO rates. Until we find that bug, disable GF, it
703 * has only limited benefit and we still interoperate with
704 * GF APs since we can always receive GF transmissions.
705 */
706 return false;
707 }
708
709 /**
710 * rs_get_supported_rates - get the available rates
711 *
712 * if management frame or broadcast frame only return
713 * basic available rates.
714 *
715 */
716 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
717 struct ieee80211_hdr *hdr,
718 enum iwl_table_type rate_type)
719 {
720 if (is_legacy(rate_type)) {
721 return lq_sta->active_legacy_rate;
722 } else {
723 if (is_siso(rate_type))
724 return lq_sta->active_siso_rate;
725 else if (is_mimo2(rate_type))
726 return lq_sta->active_mimo2_rate;
727 else
728 return lq_sta->active_mimo3_rate;
729 }
730 }
731
732 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
733 int rate_type)
734 {
735 u8 high = IWL_RATE_INVALID;
736 u8 low = IWL_RATE_INVALID;
737
738 /* 802.11A or ht walks to the next literal adjacent rate in
739 * the rate table */
740 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
741 int i;
742 u32 mask;
743
744 /* Find the previous rate that is in the rate mask */
745 i = index - 1;
746 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
747 if (rate_mask & mask) {
748 low = i;
749 break;
750 }
751 }
752
753 /* Find the next rate that is in the rate mask */
754 i = index + 1;
755 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
756 if (rate_mask & mask) {
757 high = i;
758 break;
759 }
760 }
761
762 return (high << 8) | low;
763 }
764
765 low = index;
766 while (low != IWL_RATE_INVALID) {
767 low = iwl_rates[low].prev_rs;
768 if (low == IWL_RATE_INVALID)
769 break;
770 if (rate_mask & (1 << low))
771 break;
772 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
773 }
774
775 high = index;
776 while (high != IWL_RATE_INVALID) {
777 high = iwl_rates[high].next_rs;
778 if (high == IWL_RATE_INVALID)
779 break;
780 if (rate_mask & (1 << high))
781 break;
782 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
783 }
784
785 return (high << 8) | low;
786 }
787
788 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
789 struct iwl_scale_tbl_info *tbl,
790 u8 scale_index, u8 ht_possible)
791 {
792 s32 low;
793 u16 rate_mask;
794 u16 high_low;
795 u8 switch_to_legacy = 0;
796 u8 is_green = lq_sta->is_green;
797 struct iwl_priv *priv = lq_sta->drv;
798
799 /* check if we need to switch from HT to legacy rates.
800 * assumption is that mandatory rates (1Mbps or 6Mbps)
801 * are always supported (spec demand) */
802 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
803 switch_to_legacy = 1;
804 scale_index = rs_ht_to_legacy[scale_index];
805 if (lq_sta->band == IEEE80211_BAND_5GHZ)
806 tbl->lq_type = LQ_A;
807 else
808 tbl->lq_type = LQ_G;
809
810 if (num_of_ant(tbl->ant_type) > 1)
811 tbl->ant_type =
812 first_antenna(priv->nvm_data->valid_tx_ant);
813
814 tbl->is_ht40 = 0;
815 tbl->is_SGI = 0;
816 tbl->max_search = IWL_MAX_SEARCH;
817 }
818
819 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
820
821 /* Mask with station rate restriction */
822 if (is_legacy(tbl->lq_type)) {
823 /* supp_rates has no CCK bits in A mode */
824 if (lq_sta->band == IEEE80211_BAND_5GHZ)
825 rate_mask = (u16)(rate_mask &
826 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
827 else
828 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
829 }
830
831 /* If we switched from HT to legacy, check current rate */
832 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
833 low = scale_index;
834 goto out;
835 }
836
837 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
838 tbl->lq_type);
839 low = high_low & 0xff;
840
841 if (low == IWL_RATE_INVALID)
842 low = scale_index;
843
844 out:
845 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
846 }
847
848 /*
849 * Simple function to compare two rate scale table types
850 */
851 static bool table_type_matches(struct iwl_scale_tbl_info *a,
852 struct iwl_scale_tbl_info *b)
853 {
854 return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
855 (a->is_SGI == b->is_SGI);
856 }
857
858 static void rs_bt_update_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
859 struct iwl_lq_sta *lq_sta)
860 {
861 struct iwl_scale_tbl_info *tbl;
862 bool full_concurrent = priv->bt_full_concurrent;
863
864 if (priv->bt_ant_couple_ok) {
865 /*
866 * Is there a need to switch between
867 * full concurrency and 3-wire?
868 */
869 if (priv->bt_ci_compliance && priv->bt_ant_couple_ok)
870 full_concurrent = true;
871 else
872 full_concurrent = false;
873 }
874 if ((priv->bt_traffic_load != priv->last_bt_traffic_load) ||
875 (priv->bt_full_concurrent != full_concurrent)) {
876 priv->bt_full_concurrent = full_concurrent;
877 priv->last_bt_traffic_load = priv->bt_traffic_load;
878
879 /* Update uCode's rate table. */
880 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
881 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
882 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
883
884 queue_work(priv->workqueue, &priv->bt_full_concurrency);
885 }
886 }
887
888 /*
889 * mac80211 sends us Tx status
890 */
891 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
892 struct ieee80211_sta *sta, void *priv_sta,
893 struct sk_buff *skb)
894 {
895 int legacy_success;
896 int retries;
897 int rs_index, mac_index, i;
898 struct iwl_lq_sta *lq_sta = priv_sta;
899 struct iwl_link_quality_cmd *table;
900 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
901 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)priv_r;
902 struct iwl_priv *priv = IWL_OP_MODE_GET_DVM(op_mode);
903 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
904 enum mac80211_rate_control_flags mac_flags;
905 u32 tx_rate;
906 struct iwl_scale_tbl_info tbl_type;
907 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
908 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
909 struct iwl_rxon_context *ctx = sta_priv->ctx;
910
911 IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
912
913 /* Treat uninitialized rate scaling data same as non-existing. */
914 if (!lq_sta) {
915 IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n");
916 return;
917 } else if (!lq_sta->drv) {
918 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
919 return;
920 }
921
922 if (!ieee80211_is_data(hdr->frame_control) ||
923 info->flags & IEEE80211_TX_CTL_NO_ACK)
924 return;
925
926 /* This packet was aggregated but doesn't carry status info */
927 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
928 !(info->flags & IEEE80211_TX_STAT_AMPDU))
929 return;
930
931 /*
932 * Ignore this Tx frame response if its initial rate doesn't match
933 * that of latest Link Quality command. There may be stragglers
934 * from a previous Link Quality command, but we're no longer interested
935 * in those; they're either from the "active" mode while we're trying
936 * to check "search" mode, or a prior "search" mode after we've moved
937 * to a new "search" mode (which might become the new "active" mode).
938 */
939 table = &lq_sta->lq;
940 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
941 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
942 if (priv->band == IEEE80211_BAND_5GHZ)
943 rs_index -= IWL_FIRST_OFDM_RATE;
944 mac_flags = info->status.rates[0].flags;
945 mac_index = info->status.rates[0].idx;
946 /* For HT packets, map MCS to PLCP */
947 if (mac_flags & IEEE80211_TX_RC_MCS) {
948 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
949 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
950 mac_index++;
951 /*
952 * mac80211 HT index is always zero-indexed; we need to move
953 * HT OFDM rates after CCK rates in 2.4 GHz band
954 */
955 if (priv->band == IEEE80211_BAND_2GHZ)
956 mac_index += IWL_FIRST_OFDM_RATE;
957 }
958 /* Here we actually compare this rate to the latest LQ command */
959 if ((mac_index < 0) ||
960 (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
961 (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
962 (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
963 (tbl_type.ant_type != info->status.antenna) ||
964 (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
965 (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
966 (rs_index != mac_index)) {
967 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate);
968 /*
969 * Since rates mis-match, the last LQ command may have failed.
970 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
971 * ... driver.
972 */
973 lq_sta->missed_rate_counter++;
974 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
975 lq_sta->missed_rate_counter = 0;
976 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
977 }
978 /* Regardless, ignore this status info for outdated rate */
979 return;
980 } else
981 /* Rate did match, so reset the missed_rate_counter */
982 lq_sta->missed_rate_counter = 0;
983
984 /* Figure out if rate scale algorithm is in active or search table */
985 if (table_type_matches(&tbl_type,
986 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
987 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
988 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
989 } else if (table_type_matches(&tbl_type,
990 &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
991 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
992 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
993 } else {
994 IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n");
995 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
996 IWL_DEBUG_RATE(priv, "active- lq:%x, ant:%x, SGI:%d\n",
997 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
998 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
999 IWL_DEBUG_RATE(priv, "search- lq:%x, ant:%x, SGI:%d\n",
1000 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
1001 IWL_DEBUG_RATE(priv, "actual- lq:%x, ant:%x, SGI:%d\n",
1002 tbl_type.lq_type, tbl_type.ant_type, tbl_type.is_SGI);
1003 /*
1004 * no matching table found, let's by-pass the data collection
1005 * and continue to perform rate scale to find the rate table
1006 */
1007 rs_stay_in_table(lq_sta, true);
1008 goto done;
1009 }
1010
1011 /*
1012 * Updating the frame history depends on whether packets were
1013 * aggregated.
1014 *
1015 * For aggregation, all packets were transmitted at the same rate, the
1016 * first index into rate scale table.
1017 */
1018 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1019 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
1020 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
1021 &rs_index);
1022 rs_collect_tx_data(curr_tbl, rs_index,
1023 info->status.ampdu_len,
1024 info->status.ampdu_ack_len);
1025
1026 /* Update success/fail counts if not searching for new mode */
1027 if (lq_sta->stay_in_tbl) {
1028 lq_sta->total_success += info->status.ampdu_ack_len;
1029 lq_sta->total_failed += (info->status.ampdu_len -
1030 info->status.ampdu_ack_len);
1031 }
1032 } else {
1033 /*
1034 * For legacy, update frame history with for each Tx retry.
1035 */
1036 retries = info->status.rates[0].count - 1;
1037 /* HW doesn't send more than 15 retries */
1038 retries = min(retries, 15);
1039
1040 /* The last transmission may have been successful */
1041 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1042 /* Collect data for each rate used during failed TX attempts */
1043 for (i = 0; i <= retries; ++i) {
1044 tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
1045 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
1046 &tbl_type, &rs_index);
1047 /*
1048 * Only collect stats if retried rate is in the same RS
1049 * table as active/search.
1050 */
1051 if (table_type_matches(&tbl_type, curr_tbl))
1052 tmp_tbl = curr_tbl;
1053 else if (table_type_matches(&tbl_type, other_tbl))
1054 tmp_tbl = other_tbl;
1055 else
1056 continue;
1057 rs_collect_tx_data(tmp_tbl, rs_index, 1,
1058 i < retries ? 0 : legacy_success);
1059 }
1060
1061 /* Update success/fail counts if not searching for new mode */
1062 if (lq_sta->stay_in_tbl) {
1063 lq_sta->total_success += legacy_success;
1064 lq_sta->total_failed += retries + (1 - legacy_success);
1065 }
1066 }
1067 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1068 lq_sta->last_rate_n_flags = tx_rate;
1069 done:
1070 /* See if there's a better rate or modulation mode to try. */
1071 if (sta && sta->supp_rates[sband->band])
1072 rs_rate_scale_perform(priv, skb, sta, lq_sta);
1073
1074 if (priv->lib->bt_params && priv->lib->bt_params->advanced_bt_coexist)
1075 rs_bt_update_lq(priv, ctx, lq_sta);
1076 }
1077
1078 /*
1079 * Begin a period of staying with a selected modulation mode.
1080 * Set "stay_in_tbl" flag to prevent any mode switches.
1081 * Set frame tx success limits according to legacy vs. high-throughput,
1082 * and reset overall (spanning all rates) tx success history statistics.
1083 * These control how long we stay using same modulation mode before
1084 * searching for a new mode.
1085 */
1086 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
1087 struct iwl_lq_sta *lq_sta)
1088 {
1089 IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
1090 lq_sta->stay_in_tbl = 1; /* only place this gets set */
1091 if (is_legacy) {
1092 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1093 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1094 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1095 } else {
1096 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1097 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1098 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1099 }
1100 lq_sta->table_count = 0;
1101 lq_sta->total_failed = 0;
1102 lq_sta->total_success = 0;
1103 lq_sta->flush_timer = jiffies;
1104 lq_sta->action_counter = 0;
1105 }
1106
1107 /*
1108 * Find correct throughput table for given mode of modulation
1109 */
1110 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1111 struct iwl_scale_tbl_info *tbl)
1112 {
1113 /* Used to choose among HT tables */
1114 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1115
1116 /* Check for invalid LQ type */
1117 if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1118 tbl->expected_tpt = expected_tpt_legacy;
1119 return;
1120 }
1121
1122 /* Legacy rates have only one table */
1123 if (is_legacy(tbl->lq_type)) {
1124 tbl->expected_tpt = expected_tpt_legacy;
1125 return;
1126 }
1127
1128 /* Choose among many HT tables depending on number of streams
1129 * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
1130 * status */
1131 if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1132 ht_tbl_pointer = expected_tpt_siso20MHz;
1133 else if (is_siso(tbl->lq_type))
1134 ht_tbl_pointer = expected_tpt_siso40MHz;
1135 else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1136 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1137 else if (is_mimo2(tbl->lq_type))
1138 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1139 else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1140 ht_tbl_pointer = expected_tpt_mimo3_20MHz;
1141 else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
1142 ht_tbl_pointer = expected_tpt_mimo3_40MHz;
1143
1144 if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */
1145 tbl->expected_tpt = ht_tbl_pointer[0];
1146 else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */
1147 tbl->expected_tpt = ht_tbl_pointer[1];
1148 else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */
1149 tbl->expected_tpt = ht_tbl_pointer[2];
1150 else /* AGG+SGI */
1151 tbl->expected_tpt = ht_tbl_pointer[3];
1152 }
1153
1154 /*
1155 * Find starting rate for new "search" high-throughput mode of modulation.
1156 * Goal is to find lowest expected rate (under perfect conditions) that is
1157 * above the current measured throughput of "active" mode, to give new mode
1158 * a fair chance to prove itself without too many challenges.
1159 *
1160 * This gets called when transitioning to more aggressive modulation
1161 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1162 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1163 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1164 * bit rate will typically need to increase, but not if performance was bad.
1165 */
1166 static s32 rs_get_best_rate(struct iwl_priv *priv,
1167 struct iwl_lq_sta *lq_sta,
1168 struct iwl_scale_tbl_info *tbl, /* "search" */
1169 u16 rate_mask, s8 index)
1170 {
1171 /* "active" values */
1172 struct iwl_scale_tbl_info *active_tbl =
1173 &(lq_sta->lq_info[lq_sta->active_tbl]);
1174 s32 active_sr = active_tbl->win[index].success_ratio;
1175 s32 active_tpt = active_tbl->expected_tpt[index];
1176 /* expected "search" throughput */
1177 const u16 *tpt_tbl = tbl->expected_tpt;
1178
1179 s32 new_rate, high, low, start_hi;
1180 u16 high_low;
1181 s8 rate = index;
1182
1183 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1184
1185 for (; ;) {
1186 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1187 tbl->lq_type);
1188
1189 low = high_low & 0xff;
1190 high = (high_low >> 8) & 0xff;
1191
1192 /*
1193 * Lower the "search" bit rate, to give new "search" mode
1194 * approximately the same throughput as "active" if:
1195 *
1196 * 1) "Active" mode has been working modestly well (but not
1197 * great), and expected "search" throughput (under perfect
1198 * conditions) at candidate rate is above the actual
1199 * measured "active" throughput (but less than expected
1200 * "active" throughput under perfect conditions).
1201 * OR
1202 * 2) "Active" mode has been working perfectly or very well
1203 * and expected "search" throughput (under perfect
1204 * conditions) at candidate rate is above expected
1205 * "active" throughput (under perfect conditions).
1206 */
1207 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1208 ((active_sr > IWL_RATE_DECREASE_TH) &&
1209 (active_sr <= IWL_RATE_HIGH_TH) &&
1210 (tpt_tbl[rate] <= active_tpt))) ||
1211 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1212 (tpt_tbl[rate] > active_tpt))) {
1213
1214 /* (2nd or later pass)
1215 * If we've already tried to raise the rate, and are
1216 * now trying to lower it, use the higher rate. */
1217 if (start_hi != IWL_RATE_INVALID) {
1218 new_rate = start_hi;
1219 break;
1220 }
1221
1222 new_rate = rate;
1223
1224 /* Loop again with lower rate */
1225 if (low != IWL_RATE_INVALID)
1226 rate = low;
1227
1228 /* Lower rate not available, use the original */
1229 else
1230 break;
1231
1232 /* Else try to raise the "search" rate to match "active" */
1233 } else {
1234 /* (2nd or later pass)
1235 * If we've already tried to lower the rate, and are
1236 * now trying to raise it, use the lower rate. */
1237 if (new_rate != IWL_RATE_INVALID)
1238 break;
1239
1240 /* Loop again with higher rate */
1241 else if (high != IWL_RATE_INVALID) {
1242 start_hi = high;
1243 rate = high;
1244
1245 /* Higher rate not available, use the original */
1246 } else {
1247 new_rate = rate;
1248 break;
1249 }
1250 }
1251 }
1252
1253 return new_rate;
1254 }
1255
1256 /*
1257 * Set up search table for MIMO2
1258 */
1259 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1260 struct iwl_lq_sta *lq_sta,
1261 struct ieee80211_conf *conf,
1262 struct ieee80211_sta *sta,
1263 struct iwl_scale_tbl_info *tbl, int index)
1264 {
1265 u16 rate_mask;
1266 s32 rate;
1267 s8 is_green = lq_sta->is_green;
1268 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1269 struct iwl_rxon_context *ctx = sta_priv->ctx;
1270
1271 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1272 return -1;
1273
1274 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
1275 return -1;
1276
1277 /* Need both Tx chains/antennas to support MIMO */
1278 if (priv->hw_params.tx_chains_num < 2)
1279 return -1;
1280
1281 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1282
1283 tbl->lq_type = LQ_MIMO2;
1284 tbl->is_dup = lq_sta->is_dup;
1285 tbl->action = 0;
1286 tbl->max_search = IWL_MAX_SEARCH;
1287 rate_mask = lq_sta->active_mimo2_rate;
1288
1289 if (iwl_is_ht40_tx_allowed(priv, ctx, sta))
1290 tbl->is_ht40 = 1;
1291 else
1292 tbl->is_ht40 = 0;
1293
1294 rs_set_expected_tpt_table(lq_sta, tbl);
1295
1296 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1297
1298 IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1299 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1300 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1301 rate, rate_mask);
1302 return -1;
1303 }
1304 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1305
1306 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1307 tbl->current_rate, is_green);
1308 return 0;
1309 }
1310
1311 /*
1312 * Set up search table for MIMO3
1313 */
1314 static int rs_switch_to_mimo3(struct iwl_priv *priv,
1315 struct iwl_lq_sta *lq_sta,
1316 struct ieee80211_conf *conf,
1317 struct ieee80211_sta *sta,
1318 struct iwl_scale_tbl_info *tbl, int index)
1319 {
1320 u16 rate_mask;
1321 s32 rate;
1322 s8 is_green = lq_sta->is_green;
1323 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1324 struct iwl_rxon_context *ctx = sta_priv->ctx;
1325
1326 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1327 return -1;
1328
1329 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
1330 return -1;
1331
1332 /* Need both Tx chains/antennas to support MIMO */
1333 if (priv->hw_params.tx_chains_num < 3)
1334 return -1;
1335
1336 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1337
1338 tbl->lq_type = LQ_MIMO3;
1339 tbl->is_dup = lq_sta->is_dup;
1340 tbl->action = 0;
1341 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1342 rate_mask = lq_sta->active_mimo3_rate;
1343
1344 if (iwl_is_ht40_tx_allowed(priv, ctx, sta))
1345 tbl->is_ht40 = 1;
1346 else
1347 tbl->is_ht40 = 0;
1348
1349 rs_set_expected_tpt_table(lq_sta, tbl);
1350
1351 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1352
1353 IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1354 rate, rate_mask);
1355 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1356 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1357 rate, rate_mask);
1358 return -1;
1359 }
1360 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1361
1362 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1363 tbl->current_rate, is_green);
1364 return 0;
1365 }
1366
1367 /*
1368 * Set up search table for SISO
1369 */
1370 static int rs_switch_to_siso(struct iwl_priv *priv,
1371 struct iwl_lq_sta *lq_sta,
1372 struct ieee80211_conf *conf,
1373 struct ieee80211_sta *sta,
1374 struct iwl_scale_tbl_info *tbl, int index)
1375 {
1376 u16 rate_mask;
1377 u8 is_green = lq_sta->is_green;
1378 s32 rate;
1379 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1380 struct iwl_rxon_context *ctx = sta_priv->ctx;
1381
1382 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1383 return -1;
1384
1385 IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1386
1387 tbl->is_dup = lq_sta->is_dup;
1388 tbl->lq_type = LQ_SISO;
1389 tbl->action = 0;
1390 tbl->max_search = IWL_MAX_SEARCH;
1391 rate_mask = lq_sta->active_siso_rate;
1392
1393 if (iwl_is_ht40_tx_allowed(priv, ctx, sta))
1394 tbl->is_ht40 = 1;
1395 else
1396 tbl->is_ht40 = 0;
1397
1398 if (is_green)
1399 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1400
1401 rs_set_expected_tpt_table(lq_sta, tbl);
1402 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1403
1404 IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1405 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1406 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1407 rate, rate_mask);
1408 return -1;
1409 }
1410 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1411 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1412 tbl->current_rate, is_green);
1413 return 0;
1414 }
1415
1416 /*
1417 * Try to switch to new modulation mode from legacy
1418 */
1419 static int rs_move_legacy_other(struct iwl_priv *priv,
1420 struct iwl_lq_sta *lq_sta,
1421 struct ieee80211_conf *conf,
1422 struct ieee80211_sta *sta,
1423 int index)
1424 {
1425 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1426 struct iwl_scale_tbl_info *search_tbl =
1427 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1428 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1429 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1430 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1431 u8 start_action;
1432 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1433 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1434 int ret = 0;
1435 u8 update_search_tbl_counter = 0;
1436
1437 switch (priv->bt_traffic_load) {
1438 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1439 /* nothing */
1440 break;
1441 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1442 /* avoid antenna B unless MIMO */
1443 if (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2)
1444 tbl->action = IWL_LEGACY_SWITCH_SISO;
1445 break;
1446 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1447 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1448 /* avoid antenna B and MIMO */
1449 valid_tx_ant =
1450 first_antenna(priv->nvm_data->valid_tx_ant);
1451 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2 &&
1452 tbl->action != IWL_LEGACY_SWITCH_SISO)
1453 tbl->action = IWL_LEGACY_SWITCH_SISO;
1454 break;
1455 default:
1456 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load);
1457 break;
1458 }
1459
1460 if (!iwl_ht_enabled(priv))
1461 /* stay in Legacy */
1462 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1463 else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1464 tbl->action > IWL_LEGACY_SWITCH_SISO)
1465 tbl->action = IWL_LEGACY_SWITCH_SISO;
1466
1467 /* configure as 1x1 if bt full concurrency */
1468 if (priv->bt_full_concurrent) {
1469 if (!iwl_ht_enabled(priv))
1470 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1471 else if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1472 tbl->action = IWL_LEGACY_SWITCH_SISO;
1473 valid_tx_ant =
1474 first_antenna(priv->nvm_data->valid_tx_ant);
1475 }
1476
1477 start_action = tbl->action;
1478 for (; ;) {
1479 lq_sta->action_counter++;
1480 switch (tbl->action) {
1481 case IWL_LEGACY_SWITCH_ANTENNA1:
1482 case IWL_LEGACY_SWITCH_ANTENNA2:
1483 IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1484
1485 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1486 tx_chains_num <= 1) ||
1487 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1488 tx_chains_num <= 2))
1489 break;
1490
1491 /* Don't change antenna if success has been great */
1492 if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1493 !priv->bt_full_concurrent &&
1494 priv->bt_traffic_load ==
1495 IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1496 break;
1497
1498 /* Set up search table to try other antenna */
1499 memcpy(search_tbl, tbl, sz);
1500
1501 if (rs_toggle_antenna(valid_tx_ant,
1502 &search_tbl->current_rate, search_tbl)) {
1503 update_search_tbl_counter = 1;
1504 rs_set_expected_tpt_table(lq_sta, search_tbl);
1505 goto out;
1506 }
1507 break;
1508 case IWL_LEGACY_SWITCH_SISO:
1509 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1510
1511 /* Set up search table to try SISO */
1512 memcpy(search_tbl, tbl, sz);
1513 search_tbl->is_SGI = 0;
1514 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1515 search_tbl, index);
1516 if (!ret) {
1517 lq_sta->action_counter = 0;
1518 goto out;
1519 }
1520
1521 break;
1522 case IWL_LEGACY_SWITCH_MIMO2_AB:
1523 case IWL_LEGACY_SWITCH_MIMO2_AC:
1524 case IWL_LEGACY_SWITCH_MIMO2_BC:
1525 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1526
1527 /* Set up search table to try MIMO */
1528 memcpy(search_tbl, tbl, sz);
1529 search_tbl->is_SGI = 0;
1530
1531 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1532 search_tbl->ant_type = ANT_AB;
1533 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1534 search_tbl->ant_type = ANT_AC;
1535 else
1536 search_tbl->ant_type = ANT_BC;
1537
1538 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1539 break;
1540
1541 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1542 search_tbl, index);
1543 if (!ret) {
1544 lq_sta->action_counter = 0;
1545 goto out;
1546 }
1547 break;
1548
1549 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1550 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1551
1552 /* Set up search table to try MIMO3 */
1553 memcpy(search_tbl, tbl, sz);
1554 search_tbl->is_SGI = 0;
1555
1556 search_tbl->ant_type = ANT_ABC;
1557
1558 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1559 break;
1560
1561 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1562 search_tbl, index);
1563 if (!ret) {
1564 lq_sta->action_counter = 0;
1565 goto out;
1566 }
1567 break;
1568 }
1569 tbl->action++;
1570 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1571 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1572
1573 if (tbl->action == start_action)
1574 break;
1575
1576 }
1577 search_tbl->lq_type = LQ_NONE;
1578 return 0;
1579
1580 out:
1581 lq_sta->search_better_tbl = 1;
1582 tbl->action++;
1583 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1584 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1585 if (update_search_tbl_counter)
1586 search_tbl->action = tbl->action;
1587 return 0;
1588
1589 }
1590
1591 /*
1592 * Try to switch to new modulation mode from SISO
1593 */
1594 static int rs_move_siso_to_other(struct iwl_priv *priv,
1595 struct iwl_lq_sta *lq_sta,
1596 struct ieee80211_conf *conf,
1597 struct ieee80211_sta *sta, int index)
1598 {
1599 u8 is_green = lq_sta->is_green;
1600 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1601 struct iwl_scale_tbl_info *search_tbl =
1602 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1603 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1604 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1605 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1606 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1607 u8 start_action;
1608 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1609 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1610 u8 update_search_tbl_counter = 0;
1611 int ret;
1612
1613 switch (priv->bt_traffic_load) {
1614 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1615 /* nothing */
1616 break;
1617 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1618 /* avoid antenna B unless MIMO */
1619 if (tbl->action == IWL_SISO_SWITCH_ANTENNA2)
1620 tbl->action = IWL_SISO_SWITCH_MIMO2_AB;
1621 break;
1622 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1623 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1624 /* avoid antenna B and MIMO */
1625 valid_tx_ant =
1626 first_antenna(priv->nvm_data->valid_tx_ant);
1627 if (tbl->action != IWL_SISO_SWITCH_ANTENNA1)
1628 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1629 break;
1630 default:
1631 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load);
1632 break;
1633 }
1634
1635 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1636 tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1637 /* stay in SISO */
1638 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1639 }
1640
1641 /* configure as 1x1 if bt full concurrency */
1642 if (priv->bt_full_concurrent) {
1643 valid_tx_ant =
1644 first_antenna(priv->nvm_data->valid_tx_ant);
1645 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1646 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1647 }
1648
1649 start_action = tbl->action;
1650 for (;;) {
1651 lq_sta->action_counter++;
1652 switch (tbl->action) {
1653 case IWL_SISO_SWITCH_ANTENNA1:
1654 case IWL_SISO_SWITCH_ANTENNA2:
1655 IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1656 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1657 tx_chains_num <= 1) ||
1658 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1659 tx_chains_num <= 2))
1660 break;
1661
1662 if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1663 !priv->bt_full_concurrent &&
1664 priv->bt_traffic_load ==
1665 IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1666 break;
1667
1668 memcpy(search_tbl, tbl, sz);
1669 if (rs_toggle_antenna(valid_tx_ant,
1670 &search_tbl->current_rate, search_tbl)) {
1671 update_search_tbl_counter = 1;
1672 goto out;
1673 }
1674 break;
1675 case IWL_SISO_SWITCH_MIMO2_AB:
1676 case IWL_SISO_SWITCH_MIMO2_AC:
1677 case IWL_SISO_SWITCH_MIMO2_BC:
1678 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1679 memcpy(search_tbl, tbl, sz);
1680 search_tbl->is_SGI = 0;
1681
1682 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1683 search_tbl->ant_type = ANT_AB;
1684 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1685 search_tbl->ant_type = ANT_AC;
1686 else
1687 search_tbl->ant_type = ANT_BC;
1688
1689 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1690 break;
1691
1692 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1693 search_tbl, index);
1694 if (!ret)
1695 goto out;
1696 break;
1697 case IWL_SISO_SWITCH_GI:
1698 if (!tbl->is_ht40 && !(ht_cap->cap &
1699 IEEE80211_HT_CAP_SGI_20))
1700 break;
1701 if (tbl->is_ht40 && !(ht_cap->cap &
1702 IEEE80211_HT_CAP_SGI_40))
1703 break;
1704
1705 IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1706
1707 memcpy(search_tbl, tbl, sz);
1708 if (is_green) {
1709 if (!tbl->is_SGI)
1710 break;
1711 else
1712 IWL_ERR(priv,
1713 "SGI was set in GF+SISO\n");
1714 }
1715 search_tbl->is_SGI = !tbl->is_SGI;
1716 rs_set_expected_tpt_table(lq_sta, search_tbl);
1717 if (tbl->is_SGI) {
1718 s32 tpt = lq_sta->last_tpt / 100;
1719 if (tpt >= search_tbl->expected_tpt[index])
1720 break;
1721 }
1722 search_tbl->current_rate =
1723 rate_n_flags_from_tbl(priv, search_tbl,
1724 index, is_green);
1725 update_search_tbl_counter = 1;
1726 goto out;
1727 case IWL_SISO_SWITCH_MIMO3_ABC:
1728 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1729 memcpy(search_tbl, tbl, sz);
1730 search_tbl->is_SGI = 0;
1731 search_tbl->ant_type = ANT_ABC;
1732
1733 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1734 break;
1735
1736 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1737 search_tbl, index);
1738 if (!ret)
1739 goto out;
1740 break;
1741 }
1742 tbl->action++;
1743 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1744 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1745
1746 if (tbl->action == start_action)
1747 break;
1748 }
1749 search_tbl->lq_type = LQ_NONE;
1750 return 0;
1751
1752 out:
1753 lq_sta->search_better_tbl = 1;
1754 tbl->action++;
1755 if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1756 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1757 if (update_search_tbl_counter)
1758 search_tbl->action = tbl->action;
1759
1760 return 0;
1761 }
1762
1763 /*
1764 * Try to switch to new modulation mode from MIMO2
1765 */
1766 static int rs_move_mimo2_to_other(struct iwl_priv *priv,
1767 struct iwl_lq_sta *lq_sta,
1768 struct ieee80211_conf *conf,
1769 struct ieee80211_sta *sta, int index)
1770 {
1771 s8 is_green = lq_sta->is_green;
1772 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1773 struct iwl_scale_tbl_info *search_tbl =
1774 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1775 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1776 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1777 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1778 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1779 u8 start_action;
1780 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1781 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1782 u8 update_search_tbl_counter = 0;
1783 int ret;
1784
1785 switch (priv->bt_traffic_load) {
1786 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1787 /* nothing */
1788 break;
1789 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1790 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1791 /* avoid antenna B and MIMO */
1792 if (tbl->action != IWL_MIMO2_SWITCH_SISO_A)
1793 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1794 break;
1795 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1796 /* avoid antenna B unless MIMO */
1797 if (tbl->action == IWL_MIMO2_SWITCH_SISO_B ||
1798 tbl->action == IWL_MIMO2_SWITCH_SISO_C)
1799 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1800 break;
1801 default:
1802 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load);
1803 break;
1804 }
1805
1806 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1807 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1808 tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1809 /* switch in SISO */
1810 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1811 }
1812
1813 /* configure as 1x1 if bt full concurrency */
1814 if (priv->bt_full_concurrent &&
1815 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1816 tbl->action > IWL_MIMO2_SWITCH_SISO_C))
1817 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1818
1819 start_action = tbl->action;
1820 for (;;) {
1821 lq_sta->action_counter++;
1822 switch (tbl->action) {
1823 case IWL_MIMO2_SWITCH_ANTENNA1:
1824 case IWL_MIMO2_SWITCH_ANTENNA2:
1825 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1826
1827 if (tx_chains_num <= 2)
1828 break;
1829
1830 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1831 break;
1832
1833 memcpy(search_tbl, tbl, sz);
1834 if (rs_toggle_antenna(valid_tx_ant,
1835 &search_tbl->current_rate, search_tbl)) {
1836 update_search_tbl_counter = 1;
1837 goto out;
1838 }
1839 break;
1840 case IWL_MIMO2_SWITCH_SISO_A:
1841 case IWL_MIMO2_SWITCH_SISO_B:
1842 case IWL_MIMO2_SWITCH_SISO_C:
1843 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1844
1845 /* Set up new search table for SISO */
1846 memcpy(search_tbl, tbl, sz);
1847
1848 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1849 search_tbl->ant_type = ANT_A;
1850 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1851 search_tbl->ant_type = ANT_B;
1852 else
1853 search_tbl->ant_type = ANT_C;
1854
1855 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1856 break;
1857
1858 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1859 search_tbl, index);
1860 if (!ret)
1861 goto out;
1862
1863 break;
1864
1865 case IWL_MIMO2_SWITCH_GI:
1866 if (!tbl->is_ht40 && !(ht_cap->cap &
1867 IEEE80211_HT_CAP_SGI_20))
1868 break;
1869 if (tbl->is_ht40 && !(ht_cap->cap &
1870 IEEE80211_HT_CAP_SGI_40))
1871 break;
1872
1873 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1874
1875 /* Set up new search table for MIMO2 */
1876 memcpy(search_tbl, tbl, sz);
1877 search_tbl->is_SGI = !tbl->is_SGI;
1878 rs_set_expected_tpt_table(lq_sta, search_tbl);
1879 /*
1880 * If active table already uses the fastest possible
1881 * modulation (dual stream with short guard interval),
1882 * and it's working well, there's no need to look
1883 * for a better type of modulation!
1884 */
1885 if (tbl->is_SGI) {
1886 s32 tpt = lq_sta->last_tpt / 100;
1887 if (tpt >= search_tbl->expected_tpt[index])
1888 break;
1889 }
1890 search_tbl->current_rate =
1891 rate_n_flags_from_tbl(priv, search_tbl,
1892 index, is_green);
1893 update_search_tbl_counter = 1;
1894 goto out;
1895
1896 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1897 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1898 memcpy(search_tbl, tbl, sz);
1899 search_tbl->is_SGI = 0;
1900 search_tbl->ant_type = ANT_ABC;
1901
1902 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1903 break;
1904
1905 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1906 search_tbl, index);
1907 if (!ret)
1908 goto out;
1909
1910 break;
1911 }
1912 tbl->action++;
1913 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1914 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1915
1916 if (tbl->action == start_action)
1917 break;
1918 }
1919 search_tbl->lq_type = LQ_NONE;
1920 return 0;
1921 out:
1922 lq_sta->search_better_tbl = 1;
1923 tbl->action++;
1924 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1925 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1926 if (update_search_tbl_counter)
1927 search_tbl->action = tbl->action;
1928
1929 return 0;
1930
1931 }
1932
1933 /*
1934 * Try to switch to new modulation mode from MIMO3
1935 */
1936 static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1937 struct iwl_lq_sta *lq_sta,
1938 struct ieee80211_conf *conf,
1939 struct ieee80211_sta *sta, int index)
1940 {
1941 s8 is_green = lq_sta->is_green;
1942 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1943 struct iwl_scale_tbl_info *search_tbl =
1944 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1945 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1946 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1947 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1948 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1949 u8 start_action;
1950 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1951 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1952 int ret;
1953 u8 update_search_tbl_counter = 0;
1954
1955 switch (priv->bt_traffic_load) {
1956 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1957 /* nothing */
1958 break;
1959 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1960 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1961 /* avoid antenna B and MIMO */
1962 if (tbl->action != IWL_MIMO3_SWITCH_SISO_A)
1963 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1964 break;
1965 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1966 /* avoid antenna B unless MIMO */
1967 if (tbl->action == IWL_MIMO3_SWITCH_SISO_B ||
1968 tbl->action == IWL_MIMO3_SWITCH_SISO_C)
1969 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1970 break;
1971 default:
1972 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load);
1973 break;
1974 }
1975
1976 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1977 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1978 tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1979 /* switch in SISO */
1980 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1981 }
1982
1983 /* configure as 1x1 if bt full concurrency */
1984 if (priv->bt_full_concurrent &&
1985 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1986 tbl->action > IWL_MIMO3_SWITCH_SISO_C))
1987 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1988
1989 start_action = tbl->action;
1990 for (;;) {
1991 lq_sta->action_counter++;
1992 switch (tbl->action) {
1993 case IWL_MIMO3_SWITCH_ANTENNA1:
1994 case IWL_MIMO3_SWITCH_ANTENNA2:
1995 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
1996
1997 if (tx_chains_num <= 3)
1998 break;
1999
2000 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
2001 break;
2002
2003 memcpy(search_tbl, tbl, sz);
2004 if (rs_toggle_antenna(valid_tx_ant,
2005 &search_tbl->current_rate, search_tbl))
2006 goto out;
2007 break;
2008 case IWL_MIMO3_SWITCH_SISO_A:
2009 case IWL_MIMO3_SWITCH_SISO_B:
2010 case IWL_MIMO3_SWITCH_SISO_C:
2011 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
2012
2013 /* Set up new search table for SISO */
2014 memcpy(search_tbl, tbl, sz);
2015
2016 if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
2017 search_tbl->ant_type = ANT_A;
2018 else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
2019 search_tbl->ant_type = ANT_B;
2020 else
2021 search_tbl->ant_type = ANT_C;
2022
2023 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2024 break;
2025
2026 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
2027 search_tbl, index);
2028 if (!ret)
2029 goto out;
2030
2031 break;
2032
2033 case IWL_MIMO3_SWITCH_MIMO2_AB:
2034 case IWL_MIMO3_SWITCH_MIMO2_AC:
2035 case IWL_MIMO3_SWITCH_MIMO2_BC:
2036 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
2037
2038 memcpy(search_tbl, tbl, sz);
2039 search_tbl->is_SGI = 0;
2040 if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
2041 search_tbl->ant_type = ANT_AB;
2042 else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
2043 search_tbl->ant_type = ANT_AC;
2044 else
2045 search_tbl->ant_type = ANT_BC;
2046
2047 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2048 break;
2049
2050 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
2051 search_tbl, index);
2052 if (!ret)
2053 goto out;
2054
2055 break;
2056
2057 case IWL_MIMO3_SWITCH_GI:
2058 if (!tbl->is_ht40 && !(ht_cap->cap &
2059 IEEE80211_HT_CAP_SGI_20))
2060 break;
2061 if (tbl->is_ht40 && !(ht_cap->cap &
2062 IEEE80211_HT_CAP_SGI_40))
2063 break;
2064
2065 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
2066
2067 /* Set up new search table for MIMO */
2068 memcpy(search_tbl, tbl, sz);
2069 search_tbl->is_SGI = !tbl->is_SGI;
2070 rs_set_expected_tpt_table(lq_sta, search_tbl);
2071 /*
2072 * If active table already uses the fastest possible
2073 * modulation (dual stream with short guard interval),
2074 * and it's working well, there's no need to look
2075 * for a better type of modulation!
2076 */
2077 if (tbl->is_SGI) {
2078 s32 tpt = lq_sta->last_tpt / 100;
2079 if (tpt >= search_tbl->expected_tpt[index])
2080 break;
2081 }
2082 search_tbl->current_rate =
2083 rate_n_flags_from_tbl(priv, search_tbl,
2084 index, is_green);
2085 update_search_tbl_counter = 1;
2086 goto out;
2087 }
2088 tbl->action++;
2089 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2090 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2091
2092 if (tbl->action == start_action)
2093 break;
2094 }
2095 search_tbl->lq_type = LQ_NONE;
2096 return 0;
2097 out:
2098 lq_sta->search_better_tbl = 1;
2099 tbl->action++;
2100 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2101 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2102 if (update_search_tbl_counter)
2103 search_tbl->action = tbl->action;
2104
2105 return 0;
2106
2107 }
2108
2109 /*
2110 * Check whether we should continue using same modulation mode, or
2111 * begin search for a new mode, based on:
2112 * 1) # tx successes or failures while using this mode
2113 * 2) # times calling this function
2114 * 3) elapsed time in this mode (not used, for now)
2115 */
2116 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
2117 {
2118 struct iwl_scale_tbl_info *tbl;
2119 int i;
2120 int active_tbl;
2121 int flush_interval_passed = 0;
2122 struct iwl_priv *priv;
2123
2124 priv = lq_sta->drv;
2125 active_tbl = lq_sta->active_tbl;
2126
2127 tbl = &(lq_sta->lq_info[active_tbl]);
2128
2129 /* If we've been disallowing search, see if we should now allow it */
2130 if (lq_sta->stay_in_tbl) {
2131
2132 /* Elapsed time using current modulation mode */
2133 if (lq_sta->flush_timer)
2134 flush_interval_passed =
2135 time_after(jiffies,
2136 (unsigned long)(lq_sta->flush_timer +
2137 IWL_RATE_SCALE_FLUSH_INTVL));
2138
2139 /*
2140 * Check if we should allow search for new modulation mode.
2141 * If many frames have failed or succeeded, or we've used
2142 * this same modulation for a long time, allow search, and
2143 * reset history stats that keep track of whether we should
2144 * allow a new search. Also (below) reset all bitmaps and
2145 * stats in active history.
2146 */
2147 if (force_search ||
2148 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
2149 (lq_sta->total_success > lq_sta->max_success_limit) ||
2150 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
2151 && (flush_interval_passed))) {
2152 IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n",
2153 lq_sta->total_failed,
2154 lq_sta->total_success,
2155 flush_interval_passed);
2156
2157 /* Allow search for new mode */
2158 lq_sta->stay_in_tbl = 0; /* only place reset */
2159 lq_sta->total_failed = 0;
2160 lq_sta->total_success = 0;
2161 lq_sta->flush_timer = 0;
2162
2163 /*
2164 * Else if we've used this modulation mode enough repetitions
2165 * (regardless of elapsed time or success/failure), reset
2166 * history bitmaps and rate-specific stats for all rates in
2167 * active table.
2168 */
2169 } else {
2170 lq_sta->table_count++;
2171 if (lq_sta->table_count >=
2172 lq_sta->table_count_limit) {
2173 lq_sta->table_count = 0;
2174
2175 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
2176 for (i = 0; i < IWL_RATE_COUNT; i++)
2177 rs_rate_scale_clear_window(
2178 &(tbl->win[i]));
2179 }
2180 }
2181
2182 /* If transitioning to allow "search", reset all history
2183 * bitmaps and stats in active table (this will become the new
2184 * "search" table). */
2185 if (!lq_sta->stay_in_tbl) {
2186 for (i = 0; i < IWL_RATE_COUNT; i++)
2187 rs_rate_scale_clear_window(&(tbl->win[i]));
2188 }
2189 }
2190 }
2191
2192 /*
2193 * setup rate table in uCode
2194 */
2195 static void rs_update_rate_tbl(struct iwl_priv *priv,
2196 struct iwl_rxon_context *ctx,
2197 struct iwl_lq_sta *lq_sta,
2198 struct iwl_scale_tbl_info *tbl,
2199 int index, u8 is_green)
2200 {
2201 u32 rate;
2202
2203 /* Update uCode's rate table. */
2204 rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2205 rs_fill_link_cmd(priv, lq_sta, rate);
2206 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2207 }
2208
2209 /*
2210 * Do rate scaling and search for new modulation mode.
2211 */
2212 static void rs_rate_scale_perform(struct iwl_priv *priv,
2213 struct sk_buff *skb,
2214 struct ieee80211_sta *sta,
2215 struct iwl_lq_sta *lq_sta)
2216 {
2217 struct ieee80211_hw *hw = priv->hw;
2218 struct ieee80211_conf *conf = &hw->conf;
2219 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2220 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2221 int low = IWL_RATE_INVALID;
2222 int high = IWL_RATE_INVALID;
2223 int index;
2224 int i;
2225 struct iwl_rate_scale_data *window = NULL;
2226 int current_tpt = IWL_INVALID_VALUE;
2227 int low_tpt = IWL_INVALID_VALUE;
2228 int high_tpt = IWL_INVALID_VALUE;
2229 u32 fail_count;
2230 s8 scale_action = 0;
2231 u16 rate_mask;
2232 u8 update_lq = 0;
2233 struct iwl_scale_tbl_info *tbl, *tbl1;
2234 u16 rate_scale_index_msk = 0;
2235 u8 is_green = 0;
2236 u8 active_tbl = 0;
2237 u8 done_search = 0;
2238 u16 high_low;
2239 s32 sr;
2240 u8 tid = IWL_MAX_TID_COUNT;
2241 struct iwl_tid_data *tid_data;
2242 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
2243 struct iwl_rxon_context *ctx = sta_priv->ctx;
2244
2245 IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
2246
2247 /* Send management frames and NO_ACK data using lowest rate. */
2248 /* TODO: this could probably be improved.. */
2249 if (!ieee80211_is_data(hdr->frame_control) ||
2250 info->flags & IEEE80211_TX_CTL_NO_ACK)
2251 return;
2252
2253 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
2254
2255 tid = rs_tl_add_packet(lq_sta, hdr);
2256 if ((tid != IWL_MAX_TID_COUNT) &&
2257 (lq_sta->tx_agg_tid_en & (1 << tid))) {
2258 tid_data = &priv->tid_data[lq_sta->lq.sta_id][tid];
2259 if (tid_data->agg.state == IWL_AGG_OFF)
2260 lq_sta->is_agg = 0;
2261 else
2262 lq_sta->is_agg = 1;
2263 } else
2264 lq_sta->is_agg = 0;
2265
2266 /*
2267 * Select rate-scale / modulation-mode table to work with in
2268 * the rest of this function: "search" if searching for better
2269 * modulation mode, or "active" if doing rate scaling within a mode.
2270 */
2271 if (!lq_sta->search_better_tbl)
2272 active_tbl = lq_sta->active_tbl;
2273 else
2274 active_tbl = 1 - lq_sta->active_tbl;
2275
2276 tbl = &(lq_sta->lq_info[active_tbl]);
2277 if (is_legacy(tbl->lq_type))
2278 lq_sta->is_green = 0;
2279 else
2280 lq_sta->is_green = rs_use_green(sta);
2281 is_green = lq_sta->is_green;
2282
2283 /* current tx rate */
2284 index = lq_sta->last_txrate_idx;
2285
2286 IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2287 tbl->lq_type);
2288
2289 /* rates available for this association, and for modulation mode */
2290 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2291
2292 IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
2293
2294 /* mask with station rate restriction */
2295 if (is_legacy(tbl->lq_type)) {
2296 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2297 /* supp_rates has no CCK bits in A mode */
2298 rate_scale_index_msk = (u16) (rate_mask &
2299 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2300 else
2301 rate_scale_index_msk = (u16) (rate_mask &
2302 lq_sta->supp_rates);
2303
2304 } else
2305 rate_scale_index_msk = rate_mask;
2306
2307 if (!rate_scale_index_msk)
2308 rate_scale_index_msk = rate_mask;
2309
2310 if (!((1 << index) & rate_scale_index_msk)) {
2311 IWL_ERR(priv, "Current Rate is not valid\n");
2312 if (lq_sta->search_better_tbl) {
2313 /* revert to active table if search table is not valid*/
2314 tbl->lq_type = LQ_NONE;
2315 lq_sta->search_better_tbl = 0;
2316 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2317 /* get "active" rate info */
2318 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2319 rs_update_rate_tbl(priv, ctx, lq_sta, tbl,
2320 index, is_green);
2321 }
2322 return;
2323 }
2324
2325 /* Get expected throughput table and history window for current rate */
2326 if (!tbl->expected_tpt) {
2327 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2328 return;
2329 }
2330
2331 /* force user max rate if set by user */
2332 if ((lq_sta->max_rate_idx != -1) &&
2333 (lq_sta->max_rate_idx < index)) {
2334 index = lq_sta->max_rate_idx;
2335 update_lq = 1;
2336 window = &(tbl->win[index]);
2337 goto lq_update;
2338 }
2339
2340 window = &(tbl->win[index]);
2341
2342 /*
2343 * If there is not enough history to calculate actual average
2344 * throughput, keep analyzing results of more tx frames, without
2345 * changing rate or mode (bypass most of the rest of this function).
2346 * Set up new rate table in uCode only if old rate is not supported
2347 * in current association (use new rate found above).
2348 */
2349 fail_count = window->counter - window->success_counter;
2350 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2351 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2352 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2353 "for index %d\n",
2354 window->success_counter, window->counter, index);
2355
2356 /* Can't calculate this yet; not enough history */
2357 window->average_tpt = IWL_INVALID_VALUE;
2358
2359 /* Should we stay with this modulation mode,
2360 * or search for a new one? */
2361 rs_stay_in_table(lq_sta, false);
2362
2363 goto out;
2364 }
2365 /* Else we have enough samples; calculate estimate of
2366 * actual average throughput */
2367 if (window->average_tpt != ((window->success_ratio *
2368 tbl->expected_tpt[index] + 64) / 128)) {
2369 IWL_ERR(priv, "expected_tpt should have been calculated by now\n");
2370 window->average_tpt = ((window->success_ratio *
2371 tbl->expected_tpt[index] + 64) / 128);
2372 }
2373
2374 /* If we are searching for better modulation mode, check success. */
2375 if (lq_sta->search_better_tbl &&
2376 (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
2377 /* If good success, continue using the "search" mode;
2378 * no need to send new link quality command, since we're
2379 * continuing to use the setup that we've been trying. */
2380 if (window->average_tpt > lq_sta->last_tpt) {
2381
2382 IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2383 "suc=%d cur-tpt=%d old-tpt=%d\n",
2384 window->success_ratio,
2385 window->average_tpt,
2386 lq_sta->last_tpt);
2387
2388 if (!is_legacy(tbl->lq_type))
2389 lq_sta->enable_counter = 1;
2390
2391 /* Swap tables; "search" becomes "active" */
2392 lq_sta->active_tbl = active_tbl;
2393 current_tpt = window->average_tpt;
2394
2395 /* Else poor success; go back to mode in "active" table */
2396 } else {
2397
2398 IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2399 "suc=%d cur-tpt=%d old-tpt=%d\n",
2400 window->success_ratio,
2401 window->average_tpt,
2402 lq_sta->last_tpt);
2403
2404 /* Nullify "search" table */
2405 tbl->lq_type = LQ_NONE;
2406
2407 /* Revert to "active" table */
2408 active_tbl = lq_sta->active_tbl;
2409 tbl = &(lq_sta->lq_info[active_tbl]);
2410
2411 /* Revert to "active" rate and throughput info */
2412 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2413 current_tpt = lq_sta->last_tpt;
2414
2415 /* Need to set up a new rate table in uCode */
2416 update_lq = 1;
2417 }
2418
2419 /* Either way, we've made a decision; modulation mode
2420 * search is done, allow rate adjustment next time. */
2421 lq_sta->search_better_tbl = 0;
2422 done_search = 1; /* Don't switch modes below! */
2423 goto lq_update;
2424 }
2425
2426 /* (Else) not in search of better modulation mode, try for better
2427 * starting rate, while staying in this mode. */
2428 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2429 tbl->lq_type);
2430 low = high_low & 0xff;
2431 high = (high_low >> 8) & 0xff;
2432
2433 /* If user set max rate, dont allow higher than user constrain */
2434 if ((lq_sta->max_rate_idx != -1) &&
2435 (lq_sta->max_rate_idx < high))
2436 high = IWL_RATE_INVALID;
2437
2438 sr = window->success_ratio;
2439
2440 /* Collect measured throughputs for current and adjacent rates */
2441 current_tpt = window->average_tpt;
2442 if (low != IWL_RATE_INVALID)
2443 low_tpt = tbl->win[low].average_tpt;
2444 if (high != IWL_RATE_INVALID)
2445 high_tpt = tbl->win[high].average_tpt;
2446
2447 scale_action = 0;
2448
2449 /* Too many failures, decrease rate */
2450 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2451 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2452 scale_action = -1;
2453
2454 /* No throughput measured yet for adjacent rates; try increase. */
2455 } else if ((low_tpt == IWL_INVALID_VALUE) &&
2456 (high_tpt == IWL_INVALID_VALUE)) {
2457
2458 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2459 scale_action = 1;
2460 else if (low != IWL_RATE_INVALID)
2461 scale_action = 0;
2462 }
2463
2464 /* Both adjacent throughputs are measured, but neither one has better
2465 * throughput; we're using the best rate, don't change it! */
2466 else if ((low_tpt != IWL_INVALID_VALUE) &&
2467 (high_tpt != IWL_INVALID_VALUE) &&
2468 (low_tpt < current_tpt) &&
2469 (high_tpt < current_tpt))
2470 scale_action = 0;
2471
2472 /* At least one adjacent rate's throughput is measured,
2473 * and may have better performance. */
2474 else {
2475 /* Higher adjacent rate's throughput is measured */
2476 if (high_tpt != IWL_INVALID_VALUE) {
2477 /* Higher rate has better throughput */
2478 if (high_tpt > current_tpt &&
2479 sr >= IWL_RATE_INCREASE_TH) {
2480 scale_action = 1;
2481 } else {
2482 scale_action = 0;
2483 }
2484
2485 /* Lower adjacent rate's throughput is measured */
2486 } else if (low_tpt != IWL_INVALID_VALUE) {
2487 /* Lower rate has better throughput */
2488 if (low_tpt > current_tpt) {
2489 IWL_DEBUG_RATE(priv,
2490 "decrease rate because of low tpt\n");
2491 scale_action = -1;
2492 } else if (sr >= IWL_RATE_INCREASE_TH) {
2493 scale_action = 1;
2494 }
2495 }
2496 }
2497
2498 /* Sanity check; asked for decrease, but success rate or throughput
2499 * has been good at old rate. Don't change it. */
2500 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2501 ((sr > IWL_RATE_HIGH_TH) ||
2502 (current_tpt > (100 * tbl->expected_tpt[low]))))
2503 scale_action = 0;
2504 if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2505 scale_action = -1;
2506 if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
2507 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2508 scale_action = -1;
2509
2510 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2511 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2512 if (lq_sta->last_bt_traffic > priv->bt_traffic_load) {
2513 /*
2514 * don't set scale_action, don't want to scale up if
2515 * the rate scale doesn't otherwise think that is a
2516 * good idea.
2517 */
2518 } else if (lq_sta->last_bt_traffic <= priv->bt_traffic_load) {
2519 scale_action = -1;
2520 }
2521 }
2522 lq_sta->last_bt_traffic = priv->bt_traffic_load;
2523
2524 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2525 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2526 /* search for a new modulation */
2527 rs_stay_in_table(lq_sta, true);
2528 goto lq_update;
2529 }
2530
2531 switch (scale_action) {
2532 case -1:
2533 /* Decrease starting rate, update uCode's rate table */
2534 if (low != IWL_RATE_INVALID) {
2535 update_lq = 1;
2536 index = low;
2537 }
2538
2539 break;
2540 case 1:
2541 /* Increase starting rate, update uCode's rate table */
2542 if (high != IWL_RATE_INVALID) {
2543 update_lq = 1;
2544 index = high;
2545 }
2546
2547 break;
2548 case 0:
2549 /* No change */
2550 default:
2551 break;
2552 }
2553
2554 IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2555 "high %d type %d\n",
2556 index, scale_action, low, high, tbl->lq_type);
2557
2558 lq_update:
2559 /* Replace uCode's rate table for the destination station. */
2560 if (update_lq)
2561 rs_update_rate_tbl(priv, ctx, lq_sta, tbl, index, is_green);
2562
2563 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
2564 /* Should we stay with this modulation mode,
2565 * or search for a new one? */
2566 rs_stay_in_table(lq_sta, false);
2567 }
2568 /*
2569 * Search for new modulation mode if we're:
2570 * 1) Not changing rates right now
2571 * 2) Not just finishing up a search
2572 * 3) Allowing a new search
2573 */
2574 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2575 /* Save current throughput to compare with "search" throughput*/
2576 lq_sta->last_tpt = current_tpt;
2577
2578 /* Select a new "search" modulation mode to try.
2579 * If one is found, set up the new "search" table. */
2580 if (is_legacy(tbl->lq_type))
2581 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2582 else if (is_siso(tbl->lq_type))
2583 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2584 else if (is_mimo2(tbl->lq_type))
2585 rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2586 else
2587 rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2588
2589 /* If new "search" mode was selected, set up in uCode table */
2590 if (lq_sta->search_better_tbl) {
2591 /* Access the "search" table, clear its history. */
2592 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2593 for (i = 0; i < IWL_RATE_COUNT; i++)
2594 rs_rate_scale_clear_window(&(tbl->win[i]));
2595
2596 /* Use new "search" start rate */
2597 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2598
2599 IWL_DEBUG_RATE(priv, "Switch current mcs: %X index: %d\n",
2600 tbl->current_rate, index);
2601 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2602 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2603 } else
2604 done_search = 1;
2605 }
2606
2607 if (done_search && !lq_sta->stay_in_tbl) {
2608 /* If the "active" (non-search) mode was legacy,
2609 * and we've tried switching antennas,
2610 * but we haven't been able to try HT modes (not available),
2611 * stay with best antenna legacy modulation for a while
2612 * before next round of mode comparisons. */
2613 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2614 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2615 lq_sta->action_counter > tbl1->max_search) {
2616 IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2617 rs_set_stay_in_table(priv, 1, lq_sta);
2618 }
2619
2620 /* If we're in an HT mode, and all 3 mode switch actions
2621 * have been tried and compared, stay in this best modulation
2622 * mode for a while before next round of mode comparisons. */
2623 if (lq_sta->enable_counter &&
2624 (lq_sta->action_counter >= tbl1->max_search) &&
2625 iwl_ht_enabled(priv)) {
2626 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2627 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2628 (tid != IWL_MAX_TID_COUNT)) {
2629 u8 sta_id = lq_sta->lq.sta_id;
2630 tid_data = &priv->tid_data[sta_id][tid];
2631 if (tid_data->agg.state == IWL_AGG_OFF) {
2632 IWL_DEBUG_RATE(priv,
2633 "try to aggregate tid %d\n",
2634 tid);
2635 rs_tl_turn_on_agg(priv, tid,
2636 lq_sta, sta);
2637 }
2638 }
2639 rs_set_stay_in_table(priv, 0, lq_sta);
2640 }
2641 }
2642
2643 out:
2644 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2645 lq_sta->last_txrate_idx = index;
2646 }
2647
2648 /**
2649 * rs_initialize_lq - Initialize a station's hardware rate table
2650 *
2651 * The uCode's station table contains a table of fallback rates
2652 * for automatic fallback during transmission.
2653 *
2654 * NOTE: This sets up a default set of values. These will be replaced later
2655 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2656 * rc80211_simple.
2657 *
2658 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2659 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2660 * which requires station table entry to exist).
2661 */
2662 static void rs_initialize_lq(struct iwl_priv *priv,
2663 struct ieee80211_sta *sta,
2664 struct iwl_lq_sta *lq_sta)
2665 {
2666 struct iwl_scale_tbl_info *tbl;
2667 int rate_idx;
2668 int i;
2669 u32 rate;
2670 u8 use_green = rs_use_green(sta);
2671 u8 active_tbl = 0;
2672 u8 valid_tx_ant;
2673 struct iwl_station_priv *sta_priv;
2674 struct iwl_rxon_context *ctx;
2675
2676 if (!sta || !lq_sta)
2677 return;
2678
2679 sta_priv = (void *)sta->drv_priv;
2680 ctx = sta_priv->ctx;
2681
2682 i = lq_sta->last_txrate_idx;
2683
2684 valid_tx_ant = priv->nvm_data->valid_tx_ant;
2685
2686 if (!lq_sta->search_better_tbl)
2687 active_tbl = lq_sta->active_tbl;
2688 else
2689 active_tbl = 1 - lq_sta->active_tbl;
2690
2691 tbl = &(lq_sta->lq_info[active_tbl]);
2692
2693 if ((i < 0) || (i >= IWL_RATE_COUNT))
2694 i = 0;
2695
2696 rate = iwl_rates[i].plcp;
2697 tbl->ant_type = first_antenna(valid_tx_ant);
2698 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2699
2700 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2701 rate |= RATE_MCS_CCK_MSK;
2702
2703 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2704 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2705 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2706
2707 rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2708 tbl->current_rate = rate;
2709 rs_set_expected_tpt_table(lq_sta, tbl);
2710 rs_fill_link_cmd(NULL, lq_sta, rate);
2711 priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2712 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, 0, true);
2713 }
2714
2715 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2716 struct ieee80211_tx_rate_control *txrc)
2717 {
2718
2719 struct sk_buff *skb = txrc->skb;
2720 struct ieee80211_supported_band *sband = txrc->sband;
2721 struct iwl_op_mode *op_mode __maybe_unused =
2722 (struct iwl_op_mode *)priv_r;
2723 struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
2724 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2725 struct iwl_lq_sta *lq_sta = priv_sta;
2726 int rate_idx;
2727
2728 IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2729
2730 /* Get max rate if user set max rate */
2731 if (lq_sta) {
2732 lq_sta->max_rate_idx = txrc->max_rate_idx;
2733 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2734 (lq_sta->max_rate_idx != -1))
2735 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2736 if ((lq_sta->max_rate_idx < 0) ||
2737 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2738 lq_sta->max_rate_idx = -1;
2739 }
2740
2741 /* Treat uninitialized rate scaling data same as non-existing. */
2742 if (lq_sta && !lq_sta->drv) {
2743 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
2744 priv_sta = NULL;
2745 }
2746
2747 /* Send management frames and NO_ACK data using lowest rate. */
2748 if (rate_control_send_low(sta, priv_sta, txrc))
2749 return;
2750
2751 rate_idx = lq_sta->last_txrate_idx;
2752
2753 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2754 rate_idx -= IWL_FIRST_OFDM_RATE;
2755 /* 6M and 9M shared same MCS index */
2756 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2757 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2758 IWL_RATE_MIMO3_6M_PLCP)
2759 rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2760 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2761 IWL_RATE_MIMO2_6M_PLCP)
2762 rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2763 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2764 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2765 info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2766 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2767 info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
2768 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2769 info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2770 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2771 info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2772 } else {
2773 /* Check for invalid rates */
2774 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2775 ((sband->band == IEEE80211_BAND_5GHZ) &&
2776 (rate_idx < IWL_FIRST_OFDM_RATE)))
2777 rate_idx = rate_lowest_index(sband, sta);
2778 /* On valid 5 GHz rate, adjust index */
2779 else if (sband->band == IEEE80211_BAND_5GHZ)
2780 rate_idx -= IWL_FIRST_OFDM_RATE;
2781 info->control.rates[0].flags = 0;
2782 }
2783 info->control.rates[0].idx = rate_idx;
2784 info->control.rates[0].count = 1;
2785 }
2786
2787 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2788 gfp_t gfp)
2789 {
2790 struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2791 struct iwl_op_mode *op_mode __maybe_unused =
2792 (struct iwl_op_mode *)priv_rate;
2793 struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
2794
2795 IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2796
2797 return &sta_priv->lq_sta;
2798 }
2799
2800 /*
2801 * Called after adding a new station to initialize rate scaling
2802 */
2803 void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id)
2804 {
2805 int i, j;
2806 struct ieee80211_hw *hw = priv->hw;
2807 struct ieee80211_conf *conf = &priv->hw->conf;
2808 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2809 struct iwl_station_priv *sta_priv;
2810 struct iwl_lq_sta *lq_sta;
2811 struct ieee80211_supported_band *sband;
2812 unsigned long supp; /* must be unsigned long for for_each_set_bit */
2813
2814 sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2815 lq_sta = &sta_priv->lq_sta;
2816 sband = hw->wiphy->bands[conf->chandef.chan->band];
2817
2818
2819 lq_sta->lq.sta_id = sta_id;
2820
2821 for (j = 0; j < LQ_SIZE; j++)
2822 for (i = 0; i < IWL_RATE_COUNT; i++)
2823 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2824
2825 lq_sta->flush_timer = 0;
2826 lq_sta->supp_rates = sta->supp_rates[sband->band];
2827
2828 IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n",
2829 sta_id);
2830 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2831 * the lowest or the highest rate.. Could consider using RSSI from
2832 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2833 * after assoc.. */
2834
2835 lq_sta->is_dup = 0;
2836 lq_sta->max_rate_idx = -1;
2837 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2838 lq_sta->is_green = rs_use_green(sta);
2839 lq_sta->band = sband->band;
2840 /*
2841 * active legacy rates as per supported rates bitmap
2842 */
2843 supp = sta->supp_rates[sband->band];
2844 lq_sta->active_legacy_rate = 0;
2845 for_each_set_bit(i, &supp, BITS_PER_LONG)
2846 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2847
2848 /*
2849 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2850 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2851 */
2852 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2853 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2854 lq_sta->active_siso_rate &= ~((u16)0x2);
2855 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2856
2857 /* Same here */
2858 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2859 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2860 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2861 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2862
2863 lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2864 lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2865 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2866 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2867
2868 IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2869 lq_sta->active_siso_rate,
2870 lq_sta->active_mimo2_rate,
2871 lq_sta->active_mimo3_rate);
2872
2873 /* These values will be overridden later */
2874 lq_sta->lq.general_params.single_stream_ant_msk =
2875 first_antenna(priv->nvm_data->valid_tx_ant);
2876 lq_sta->lq.general_params.dual_stream_ant_msk =
2877 priv->nvm_data->valid_tx_ant &
2878 ~first_antenna(priv->nvm_data->valid_tx_ant);
2879 if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2880 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2881 } else if (num_of_ant(priv->nvm_data->valid_tx_ant) == 2) {
2882 lq_sta->lq.general_params.dual_stream_ant_msk =
2883 priv->nvm_data->valid_tx_ant;
2884 }
2885
2886 /* as default allow aggregation for all tids */
2887 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2888 lq_sta->drv = priv;
2889
2890 /* Set last_txrate_idx to lowest rate */
2891 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2892 if (sband->band == IEEE80211_BAND_5GHZ)
2893 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2894 lq_sta->is_agg = 0;
2895 #ifdef CONFIG_MAC80211_DEBUGFS
2896 lq_sta->dbg_fixed_rate = 0;
2897 #endif
2898
2899 rs_initialize_lq(priv, sta, lq_sta);
2900 }
2901
2902 static void rs_fill_link_cmd(struct iwl_priv *priv,
2903 struct iwl_lq_sta *lq_sta, u32 new_rate)
2904 {
2905 struct iwl_scale_tbl_info tbl_type;
2906 int index = 0;
2907 int rate_idx;
2908 int repeat_rate = 0;
2909 u8 ant_toggle_cnt = 0;
2910 u8 use_ht_possible = 1;
2911 u8 valid_tx_ant = 0;
2912 struct iwl_station_priv *sta_priv =
2913 container_of(lq_sta, struct iwl_station_priv, lq_sta);
2914 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2915
2916 /* Override starting rate (index 0) if needed for debug purposes */
2917 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2918
2919 /* Interpret new_rate (rate_n_flags) */
2920 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2921 &tbl_type, &rate_idx);
2922
2923 if (priv && priv->bt_full_concurrent) {
2924 /* 1x1 only */
2925 tbl_type.ant_type =
2926 first_antenna(priv->nvm_data->valid_tx_ant);
2927 }
2928
2929 /* How many times should we repeat the initial rate? */
2930 if (is_legacy(tbl_type.lq_type)) {
2931 ant_toggle_cnt = 1;
2932 repeat_rate = IWL_NUMBER_TRY;
2933 } else {
2934 repeat_rate = min(IWL_HT_NUMBER_TRY,
2935 LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2936 }
2937
2938 lq_cmd->general_params.mimo_delimiter =
2939 is_mimo(tbl_type.lq_type) ? 1 : 0;
2940
2941 /* Fill 1st table entry (index 0) */
2942 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2943
2944 if (num_of_ant(tbl_type.ant_type) == 1) {
2945 lq_cmd->general_params.single_stream_ant_msk =
2946 tbl_type.ant_type;
2947 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2948 lq_cmd->general_params.dual_stream_ant_msk =
2949 tbl_type.ant_type;
2950 } /* otherwise we don't modify the existing value */
2951
2952 index++;
2953 repeat_rate--;
2954 if (priv) {
2955 if (priv->bt_full_concurrent)
2956 valid_tx_ant = ANT_A;
2957 else
2958 valid_tx_ant = priv->nvm_data->valid_tx_ant;
2959 }
2960
2961 /* Fill rest of rate table */
2962 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2963 /* Repeat initial/next rate.
2964 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2965 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2966 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2967 if (is_legacy(tbl_type.lq_type)) {
2968 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2969 ant_toggle_cnt++;
2970 else if (priv &&
2971 rs_toggle_antenna(valid_tx_ant,
2972 &new_rate, &tbl_type))
2973 ant_toggle_cnt = 1;
2974 }
2975
2976 /* Override next rate if needed for debug purposes */
2977 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2978
2979 /* Fill next table entry */
2980 lq_cmd->rs_table[index].rate_n_flags =
2981 cpu_to_le32(new_rate);
2982 repeat_rate--;
2983 index++;
2984 }
2985
2986 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2987 &rate_idx);
2988
2989 if (priv && priv->bt_full_concurrent) {
2990 /* 1x1 only */
2991 tbl_type.ant_type =
2992 first_antenna(priv->nvm_data->valid_tx_ant);
2993 }
2994
2995 /* Indicate to uCode which entries might be MIMO.
2996 * If initial rate was MIMO, this will finally end up
2997 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2998 if (is_mimo(tbl_type.lq_type))
2999 lq_cmd->general_params.mimo_delimiter = index;
3000
3001 /* Get next rate */
3002 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
3003 use_ht_possible);
3004
3005 /* How many times should we repeat the next rate? */
3006 if (is_legacy(tbl_type.lq_type)) {
3007 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
3008 ant_toggle_cnt++;
3009 else if (priv &&
3010 rs_toggle_antenna(valid_tx_ant,
3011 &new_rate, &tbl_type))
3012 ant_toggle_cnt = 1;
3013
3014 repeat_rate = IWL_NUMBER_TRY;
3015 } else {
3016 repeat_rate = IWL_HT_NUMBER_TRY;
3017 }
3018
3019 /* Don't allow HT rates after next pass.
3020 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
3021 use_ht_possible = 0;
3022
3023 /* Override next rate if needed for debug purposes */
3024 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
3025
3026 /* Fill next table entry */
3027 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
3028
3029 index++;
3030 repeat_rate--;
3031 }
3032
3033 lq_cmd->agg_params.agg_frame_cnt_limit =
3034 sta_priv->max_agg_bufsize ?: LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3035 lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
3036
3037 lq_cmd->agg_params.agg_time_limit =
3038 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
3039 /*
3040 * overwrite if needed, pass aggregation time limit
3041 * to uCode in uSec
3042 */
3043 if (priv && priv->lib->bt_params &&
3044 priv->lib->bt_params->agg_time_limit &&
3045 priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH)
3046 lq_cmd->agg_params.agg_time_limit =
3047 cpu_to_le16(priv->lib->bt_params->agg_time_limit);
3048 }
3049
3050 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3051 {
3052 return hw->priv;
3053 }
3054 /* rate scale requires free function to be implemented */
3055 static void rs_free(void *priv_rate)
3056 {
3057 return;
3058 }
3059
3060 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
3061 void *priv_sta)
3062 {
3063 struct iwl_op_mode *op_mode __maybe_unused = priv_r;
3064 struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
3065
3066 IWL_DEBUG_RATE(priv, "enter\n");
3067 IWL_DEBUG_RATE(priv, "leave\n");
3068 }
3069
3070 #ifdef CONFIG_MAC80211_DEBUGFS
3071 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
3072 u32 *rate_n_flags, int index)
3073 {
3074 struct iwl_priv *priv;
3075 u8 valid_tx_ant;
3076 u8 ant_sel_tx;
3077
3078 priv = lq_sta->drv;
3079 valid_tx_ant = priv->nvm_data->valid_tx_ant;
3080 if (lq_sta->dbg_fixed_rate) {
3081 ant_sel_tx =
3082 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
3083 >> RATE_MCS_ANT_POS);
3084 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
3085 *rate_n_flags = lq_sta->dbg_fixed_rate;
3086 IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
3087 } else {
3088 lq_sta->dbg_fixed_rate = 0;
3089 IWL_ERR(priv,
3090 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
3091 ant_sel_tx, valid_tx_ant);
3092 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3093 }
3094 } else {
3095 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3096 }
3097 }
3098
3099 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3100 const char __user *user_buf, size_t count, loff_t *ppos)
3101 {
3102 struct iwl_lq_sta *lq_sta = file->private_data;
3103 struct iwl_priv *priv;
3104 char buf[64];
3105 size_t buf_size;
3106 u32 parsed_rate;
3107
3108
3109 priv = lq_sta->drv;
3110 memset(buf, 0, sizeof(buf));
3111 buf_size = min(count, sizeof(buf) - 1);
3112 if (copy_from_user(buf, user_buf, buf_size))
3113 return -EFAULT;
3114
3115 if (sscanf(buf, "%x", &parsed_rate) == 1)
3116 lq_sta->dbg_fixed_rate = parsed_rate;
3117 else
3118 lq_sta->dbg_fixed_rate = 0;
3119
3120 rs_program_fix_rate(priv, lq_sta);
3121
3122 return count;
3123 }
3124
3125 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3126 char __user *user_buf, size_t count, loff_t *ppos)
3127 {
3128 char *buff;
3129 int desc = 0;
3130 int i = 0;
3131 int index = 0;
3132 ssize_t ret;
3133
3134 struct iwl_lq_sta *lq_sta = file->private_data;
3135 struct iwl_priv *priv;
3136 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3137
3138 priv = lq_sta->drv;
3139 buff = kmalloc(1024, GFP_KERNEL);
3140 if (!buff)
3141 return -ENOMEM;
3142
3143 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3144 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
3145 lq_sta->total_failed, lq_sta->total_success,
3146 lq_sta->active_legacy_rate);
3147 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3148 lq_sta->dbg_fixed_rate);
3149 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3150 (priv->nvm_data->valid_tx_ant & ANT_A) ? "ANT_A," : "",
3151 (priv->nvm_data->valid_tx_ant & ANT_B) ? "ANT_B," : "",
3152 (priv->nvm_data->valid_tx_ant & ANT_C) ? "ANT_C" : "");
3153 desc += sprintf(buff+desc, "lq type %s\n",
3154 (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
3155 if (is_Ht(tbl->lq_type)) {
3156 desc += sprintf(buff+desc, " %s",
3157 (is_siso(tbl->lq_type)) ? "SISO" :
3158 ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
3159 desc += sprintf(buff+desc, " %s",
3160 (tbl->is_ht40) ? "40MHz" : "20MHz");
3161 desc += sprintf(buff+desc, " %s %s %s\n", (tbl->is_SGI) ? "SGI" : "",
3162 (lq_sta->is_green) ? "GF enabled" : "",
3163 (lq_sta->is_agg) ? "AGG on" : "");
3164 }
3165 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3166 lq_sta->last_rate_n_flags);
3167 desc += sprintf(buff+desc, "general:"
3168 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
3169 lq_sta->lq.general_params.flags,
3170 lq_sta->lq.general_params.mimo_delimiter,
3171 lq_sta->lq.general_params.single_stream_ant_msk,
3172 lq_sta->lq.general_params.dual_stream_ant_msk);
3173
3174 desc += sprintf(buff+desc, "agg:"
3175 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3176 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
3177 lq_sta->lq.agg_params.agg_dis_start_th,
3178 lq_sta->lq.agg_params.agg_frame_cnt_limit);
3179
3180 desc += sprintf(buff+desc,
3181 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3182 lq_sta->lq.general_params.start_rate_index[0],
3183 lq_sta->lq.general_params.start_rate_index[1],
3184 lq_sta->lq.general_params.start_rate_index[2],
3185 lq_sta->lq.general_params.start_rate_index[3]);
3186
3187 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3188 index = iwl_hwrate_to_plcp_idx(
3189 le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
3190 if (is_legacy(tbl->lq_type)) {
3191 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
3192 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3193 iwl_rate_mcs[index].mbps);
3194 } else {
3195 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
3196 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3197 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
3198 }
3199 }
3200
3201 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3202 kfree(buff);
3203 return ret;
3204 }
3205
3206 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3207 .write = rs_sta_dbgfs_scale_table_write,
3208 .read = rs_sta_dbgfs_scale_table_read,
3209 .open = simple_open,
3210 .llseek = default_llseek,
3211 };
3212 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3213 char __user *user_buf, size_t count, loff_t *ppos)
3214 {
3215 char *buff;
3216 int desc = 0;
3217 int i, j;
3218 ssize_t ret;
3219
3220 struct iwl_lq_sta *lq_sta = file->private_data;
3221
3222 buff = kmalloc(1024, GFP_KERNEL);
3223 if (!buff)
3224 return -ENOMEM;
3225
3226 for (i = 0; i < LQ_SIZE; i++) {
3227 desc += sprintf(buff+desc,
3228 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
3229 "rate=0x%X\n",
3230 lq_sta->active_tbl == i ? "*" : "x",
3231 lq_sta->lq_info[i].lq_type,
3232 lq_sta->lq_info[i].is_SGI,
3233 lq_sta->lq_info[i].is_ht40,
3234 lq_sta->lq_info[i].is_dup,
3235 lq_sta->is_green,
3236 lq_sta->lq_info[i].current_rate);
3237 for (j = 0; j < IWL_RATE_COUNT; j++) {
3238 desc += sprintf(buff+desc,
3239 "counter=%d success=%d %%=%d\n",
3240 lq_sta->lq_info[i].win[j].counter,
3241 lq_sta->lq_info[i].win[j].success_counter,
3242 lq_sta->lq_info[i].win[j].success_ratio);
3243 }
3244 }
3245 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3246 kfree(buff);
3247 return ret;
3248 }
3249
3250 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3251 .read = rs_sta_dbgfs_stats_table_read,
3252 .open = simple_open,
3253 .llseek = default_llseek,
3254 };
3255
3256 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3257 char __user *user_buf, size_t count, loff_t *ppos)
3258 {
3259 struct iwl_lq_sta *lq_sta = file->private_data;
3260 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3261 char buff[120];
3262 int desc = 0;
3263
3264 if (is_Ht(tbl->lq_type))
3265 desc += sprintf(buff+desc,
3266 "Bit Rate= %d Mb/s\n",
3267 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3268 else
3269 desc += sprintf(buff+desc,
3270 "Bit Rate= %d Mb/s\n",
3271 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3272
3273 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3274 }
3275
3276 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3277 .read = rs_sta_dbgfs_rate_scale_data_read,
3278 .open = simple_open,
3279 .llseek = default_llseek,
3280 };
3281
3282 static void rs_add_debugfs(void *priv, void *priv_sta,
3283 struct dentry *dir)
3284 {
3285 struct iwl_lq_sta *lq_sta = priv_sta;
3286 lq_sta->rs_sta_dbgfs_scale_table_file =
3287 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3288 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3289 lq_sta->rs_sta_dbgfs_stats_table_file =
3290 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3291 lq_sta, &rs_sta_dbgfs_stats_table_ops);
3292 lq_sta->rs_sta_dbgfs_rate_scale_data_file =
3293 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
3294 lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
3295 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
3296 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3297 &lq_sta->tx_agg_tid_en);
3298
3299 }
3300
3301 static void rs_remove_debugfs(void *priv, void *priv_sta)
3302 {
3303 struct iwl_lq_sta *lq_sta = priv_sta;
3304 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3305 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
3306 debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
3307 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
3308 }
3309 #endif
3310
3311 /*
3312 * Initialization of rate scaling information is done by driver after
3313 * the station is added. Since mac80211 calls this function before a
3314 * station is added we ignore it.
3315 */
3316 static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband,
3317 struct cfg80211_chan_def *chandef,
3318 struct ieee80211_sta *sta, void *priv_sta)
3319 {
3320 }
3321
3322 static const struct rate_control_ops rs_ops = {
3323 .name = RS_NAME,
3324 .tx_status = rs_tx_status,
3325 .get_rate = rs_get_rate,
3326 .rate_init = rs_rate_init_stub,
3327 .alloc = rs_alloc,
3328 .free = rs_free,
3329 .alloc_sta = rs_alloc_sta,
3330 .free_sta = rs_free_sta,
3331 #ifdef CONFIG_MAC80211_DEBUGFS
3332 .add_sta_debugfs = rs_add_debugfs,
3333 .remove_sta_debugfs = rs_remove_debugfs,
3334 #endif
3335 };
3336
3337 int iwlagn_rate_control_register(void)
3338 {
3339 return ieee80211_rate_control_register(&rs_ops);
3340 }
3341
3342 void iwlagn_rate_control_unregister(void)
3343 {
3344 ieee80211_rate_control_unregister(&rs_ops);
3345 }
3346
Linux kernel - Deliverables
This page took 0.165485 seconds and 5 git commands to generate.