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net/mlx4_en: Move filters cleanup to a proper location
[linux/fpc-iii.git] / drivers / net / wireless / intel / iwlwifi / dvm / rs.c
blobb95c2d76db33c52cf6c5c9e1957ead160917f772
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 <linuxwifi@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 nl80211_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 == NL80211_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 == NL80211_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 == NL80211_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 == NL80211_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 == NL80211_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 void 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;
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 }
1588
1589 /*
1590 * Try to switch to new modulation mode from SISO
1591 */
1592 static void rs_move_siso_to_other(struct iwl_priv *priv,
1593 struct iwl_lq_sta *lq_sta,
1594 struct ieee80211_conf *conf,
1595 struct ieee80211_sta *sta, int index)
1596 {
1597 u8 is_green = lq_sta->is_green;
1598 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1599 struct iwl_scale_tbl_info *search_tbl =
1600 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1601 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1602 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1603 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1604 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1605 u8 start_action;
1606 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1607 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1608 u8 update_search_tbl_counter = 0;
1609 int ret;
1610
1611 switch (priv->bt_traffic_load) {
1612 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1613 /* nothing */
1614 break;
1615 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1616 /* avoid antenna B unless MIMO */
1617 if (tbl->action == IWL_SISO_SWITCH_ANTENNA2)
1618 tbl->action = IWL_SISO_SWITCH_MIMO2_AB;
1619 break;
1620 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1621 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1622 /* avoid antenna B and MIMO */
1623 valid_tx_ant =
1624 first_antenna(priv->nvm_data->valid_tx_ant);
1625 if (tbl->action != IWL_SISO_SWITCH_ANTENNA1)
1626 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1627 break;
1628 default:
1629 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load);
1630 break;
1631 }
1632
1633 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1634 tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1635 /* stay in SISO */
1636 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1637 }
1638
1639 /* configure as 1x1 if bt full concurrency */
1640 if (priv->bt_full_concurrent) {
1641 valid_tx_ant =
1642 first_antenna(priv->nvm_data->valid_tx_ant);
1643 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1644 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1645 }
1646
1647 start_action = tbl->action;
1648 for (;;) {
1649 lq_sta->action_counter++;
1650 switch (tbl->action) {
1651 case IWL_SISO_SWITCH_ANTENNA1:
1652 case IWL_SISO_SWITCH_ANTENNA2:
1653 IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1654 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1655 tx_chains_num <= 1) ||
1656 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1657 tx_chains_num <= 2))
1658 break;
1659
1660 if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1661 !priv->bt_full_concurrent &&
1662 priv->bt_traffic_load ==
1663 IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1664 break;
1665
1666 memcpy(search_tbl, tbl, sz);
1667 if (rs_toggle_antenna(valid_tx_ant,
1668 &search_tbl->current_rate, search_tbl)) {
1669 update_search_tbl_counter = 1;
1670 goto out;
1671 }
1672 break;
1673 case IWL_SISO_SWITCH_MIMO2_AB:
1674 case IWL_SISO_SWITCH_MIMO2_AC:
1675 case IWL_SISO_SWITCH_MIMO2_BC:
1676 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1677 memcpy(search_tbl, tbl, sz);
1678 search_tbl->is_SGI = 0;
1679
1680 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1681 search_tbl->ant_type = ANT_AB;
1682 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1683 search_tbl->ant_type = ANT_AC;
1684 else
1685 search_tbl->ant_type = ANT_BC;
1686
1687 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1688 break;
1689
1690 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1691 search_tbl, index);
1692 if (!ret)
1693 goto out;
1694 break;
1695 case IWL_SISO_SWITCH_GI:
1696 if (!tbl->is_ht40 && !(ht_cap->cap &
1697 IEEE80211_HT_CAP_SGI_20))
1698 break;
1699 if (tbl->is_ht40 && !(ht_cap->cap &
1700 IEEE80211_HT_CAP_SGI_40))
1701 break;
1702
1703 IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1704
1705 memcpy(search_tbl, tbl, sz);
1706 if (is_green) {
1707 if (!tbl->is_SGI)
1708 break;
1709 else
1710 IWL_ERR(priv,
1711 "SGI was set in GF+SISO\n");
1712 }
1713 search_tbl->is_SGI = !tbl->is_SGI;
1714 rs_set_expected_tpt_table(lq_sta, search_tbl);
1715 if (tbl->is_SGI) {
1716 s32 tpt = lq_sta->last_tpt / 100;
1717 if (tpt >= search_tbl->expected_tpt[index])
1718 break;
1719 }
1720 search_tbl->current_rate =
1721 rate_n_flags_from_tbl(priv, search_tbl,
1722 index, is_green);
1723 update_search_tbl_counter = 1;
1724 goto out;
1725 case IWL_SISO_SWITCH_MIMO3_ABC:
1726 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1727 memcpy(search_tbl, tbl, sz);
1728 search_tbl->is_SGI = 0;
1729 search_tbl->ant_type = ANT_ABC;
1730
1731 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1732 break;
1733
1734 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1735 search_tbl, index);
1736 if (!ret)
1737 goto out;
1738 break;
1739 }
1740 tbl->action++;
1741 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1742 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1743
1744 if (tbl->action == start_action)
1745 break;
1746 }
1747 search_tbl->lq_type = LQ_NONE;
1748 return;
1749
1750 out:
1751 lq_sta->search_better_tbl = 1;
1752 tbl->action++;
1753 if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1754 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1755 if (update_search_tbl_counter)
1756 search_tbl->action = tbl->action;
1757 }
1758
1759 /*
1760 * Try to switch to new modulation mode from MIMO2
1761 */
1762 static void rs_move_mimo2_to_other(struct iwl_priv *priv,
1763 struct iwl_lq_sta *lq_sta,
1764 struct ieee80211_conf *conf,
1765 struct ieee80211_sta *sta, int index)
1766 {
1767 s8 is_green = lq_sta->is_green;
1768 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1769 struct iwl_scale_tbl_info *search_tbl =
1770 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1771 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1772 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1773 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1774 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1775 u8 start_action;
1776 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1777 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1778 u8 update_search_tbl_counter = 0;
1779 int ret;
1780
1781 switch (priv->bt_traffic_load) {
1782 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1783 /* nothing */
1784 break;
1785 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1786 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1787 /* avoid antenna B and MIMO */
1788 if (tbl->action != IWL_MIMO2_SWITCH_SISO_A)
1789 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1790 break;
1791 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1792 /* avoid antenna B unless MIMO */
1793 if (tbl->action == IWL_MIMO2_SWITCH_SISO_B ||
1794 tbl->action == IWL_MIMO2_SWITCH_SISO_C)
1795 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1796 break;
1797 default:
1798 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load);
1799 break;
1800 }
1801
1802 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1803 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1804 tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1805 /* switch in SISO */
1806 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1807 }
1808
1809 /* configure as 1x1 if bt full concurrency */
1810 if (priv->bt_full_concurrent &&
1811 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1812 tbl->action > IWL_MIMO2_SWITCH_SISO_C))
1813 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1814
1815 start_action = tbl->action;
1816 for (;;) {
1817 lq_sta->action_counter++;
1818 switch (tbl->action) {
1819 case IWL_MIMO2_SWITCH_ANTENNA1:
1820 case IWL_MIMO2_SWITCH_ANTENNA2:
1821 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1822
1823 if (tx_chains_num <= 2)
1824 break;
1825
1826 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1827 break;
1828
1829 memcpy(search_tbl, tbl, sz);
1830 if (rs_toggle_antenna(valid_tx_ant,
1831 &search_tbl->current_rate, search_tbl)) {
1832 update_search_tbl_counter = 1;
1833 goto out;
1834 }
1835 break;
1836 case IWL_MIMO2_SWITCH_SISO_A:
1837 case IWL_MIMO2_SWITCH_SISO_B:
1838 case IWL_MIMO2_SWITCH_SISO_C:
1839 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1840
1841 /* Set up new search table for SISO */
1842 memcpy(search_tbl, tbl, sz);
1843
1844 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1845 search_tbl->ant_type = ANT_A;
1846 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1847 search_tbl->ant_type = ANT_B;
1848 else
1849 search_tbl->ant_type = ANT_C;
1850
1851 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1852 break;
1853
1854 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1855 search_tbl, index);
1856 if (!ret)
1857 goto out;
1858
1859 break;
1860
1861 case IWL_MIMO2_SWITCH_GI:
1862 if (!tbl->is_ht40 && !(ht_cap->cap &
1863 IEEE80211_HT_CAP_SGI_20))
1864 break;
1865 if (tbl->is_ht40 && !(ht_cap->cap &
1866 IEEE80211_HT_CAP_SGI_40))
1867 break;
1868
1869 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1870
1871 /* Set up new search table for MIMO2 */
1872 memcpy(search_tbl, tbl, sz);
1873 search_tbl->is_SGI = !tbl->is_SGI;
1874 rs_set_expected_tpt_table(lq_sta, search_tbl);
1875 /*
1876 * If active table already uses the fastest possible
1877 * modulation (dual stream with short guard interval),
1878 * and it's working well, there's no need to look
1879 * for a better type of modulation!
1880 */
1881 if (tbl->is_SGI) {
1882 s32 tpt = lq_sta->last_tpt / 100;
1883 if (tpt >= search_tbl->expected_tpt[index])
1884 break;
1885 }
1886 search_tbl->current_rate =
1887 rate_n_flags_from_tbl(priv, search_tbl,
1888 index, is_green);
1889 update_search_tbl_counter = 1;
1890 goto out;
1891
1892 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1893 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1894 memcpy(search_tbl, tbl, sz);
1895 search_tbl->is_SGI = 0;
1896 search_tbl->ant_type = ANT_ABC;
1897
1898 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1899 break;
1900
1901 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1902 search_tbl, index);
1903 if (!ret)
1904 goto out;
1905
1906 break;
1907 }
1908 tbl->action++;
1909 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1910 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1911
1912 if (tbl->action == start_action)
1913 break;
1914 }
1915 search_tbl->lq_type = LQ_NONE;
1916 return;
1917 out:
1918 lq_sta->search_better_tbl = 1;
1919 tbl->action++;
1920 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1921 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1922 if (update_search_tbl_counter)
1923 search_tbl->action = tbl->action;
1924
1925 }
1926
1927 /*
1928 * Try to switch to new modulation mode from MIMO3
1929 */
1930 static void rs_move_mimo3_to_other(struct iwl_priv *priv,
1931 struct iwl_lq_sta *lq_sta,
1932 struct ieee80211_conf *conf,
1933 struct ieee80211_sta *sta, int index)
1934 {
1935 s8 is_green = lq_sta->is_green;
1936 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1937 struct iwl_scale_tbl_info *search_tbl =
1938 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1939 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1940 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1941 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1942 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1943 u8 start_action;
1944 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1945 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1946 int ret;
1947 u8 update_search_tbl_counter = 0;
1948
1949 switch (priv->bt_traffic_load) {
1950 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1951 /* nothing */
1952 break;
1953 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1954 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1955 /* avoid antenna B and MIMO */
1956 if (tbl->action != IWL_MIMO3_SWITCH_SISO_A)
1957 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1958 break;
1959 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1960 /* avoid antenna B unless MIMO */
1961 if (tbl->action == IWL_MIMO3_SWITCH_SISO_B ||
1962 tbl->action == IWL_MIMO3_SWITCH_SISO_C)
1963 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1964 break;
1965 default:
1966 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load);
1967 break;
1968 }
1969
1970 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1971 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1972 tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1973 /* switch in SISO */
1974 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1975 }
1976
1977 /* configure as 1x1 if bt full concurrency */
1978 if (priv->bt_full_concurrent &&
1979 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1980 tbl->action > IWL_MIMO3_SWITCH_SISO_C))
1981 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1982
1983 start_action = tbl->action;
1984 for (;;) {
1985 lq_sta->action_counter++;
1986 switch (tbl->action) {
1987 case IWL_MIMO3_SWITCH_ANTENNA1:
1988 case IWL_MIMO3_SWITCH_ANTENNA2:
1989 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
1990
1991 if (tx_chains_num <= 3)
1992 break;
1993
1994 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1995 break;
1996
1997 memcpy(search_tbl, tbl, sz);
1998 if (rs_toggle_antenna(valid_tx_ant,
1999 &search_tbl->current_rate, search_tbl))
2000 goto out;
2001 break;
2002 case IWL_MIMO3_SWITCH_SISO_A:
2003 case IWL_MIMO3_SWITCH_SISO_B:
2004 case IWL_MIMO3_SWITCH_SISO_C:
2005 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
2006
2007 /* Set up new search table for SISO */
2008 memcpy(search_tbl, tbl, sz);
2009
2010 if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
2011 search_tbl->ant_type = ANT_A;
2012 else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
2013 search_tbl->ant_type = ANT_B;
2014 else
2015 search_tbl->ant_type = ANT_C;
2016
2017 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2018 break;
2019
2020 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
2021 search_tbl, index);
2022 if (!ret)
2023 goto out;
2024
2025 break;
2026
2027 case IWL_MIMO3_SWITCH_MIMO2_AB:
2028 case IWL_MIMO3_SWITCH_MIMO2_AC:
2029 case IWL_MIMO3_SWITCH_MIMO2_BC:
2030 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
2031
2032 memcpy(search_tbl, tbl, sz);
2033 search_tbl->is_SGI = 0;
2034 if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
2035 search_tbl->ant_type = ANT_AB;
2036 else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
2037 search_tbl->ant_type = ANT_AC;
2038 else
2039 search_tbl->ant_type = ANT_BC;
2040
2041 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2042 break;
2043
2044 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
2045 search_tbl, index);
2046 if (!ret)
2047 goto out;
2048
2049 break;
2050
2051 case IWL_MIMO3_SWITCH_GI:
2052 if (!tbl->is_ht40 && !(ht_cap->cap &
2053 IEEE80211_HT_CAP_SGI_20))
2054 break;
2055 if (tbl->is_ht40 && !(ht_cap->cap &
2056 IEEE80211_HT_CAP_SGI_40))
2057 break;
2058
2059 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
2060
2061 /* Set up new search table for MIMO */
2062 memcpy(search_tbl, tbl, sz);
2063 search_tbl->is_SGI = !tbl->is_SGI;
2064 rs_set_expected_tpt_table(lq_sta, search_tbl);
2065 /*
2066 * If active table already uses the fastest possible
2067 * modulation (dual stream with short guard interval),
2068 * and it's working well, there's no need to look
2069 * for a better type of modulation!
2070 */
2071 if (tbl->is_SGI) {
2072 s32 tpt = lq_sta->last_tpt / 100;
2073 if (tpt >= search_tbl->expected_tpt[index])
2074 break;
2075 }
2076 search_tbl->current_rate =
2077 rate_n_flags_from_tbl(priv, search_tbl,
2078 index, is_green);
2079 update_search_tbl_counter = 1;
2080 goto out;
2081 }
2082 tbl->action++;
2083 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2084 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2085
2086 if (tbl->action == start_action)
2087 break;
2088 }
2089 search_tbl->lq_type = LQ_NONE;
2090 return;
2091 out:
2092 lq_sta->search_better_tbl = 1;
2093 tbl->action++;
2094 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2095 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2096 if (update_search_tbl_counter)
2097 search_tbl->action = tbl->action;
2098 }
2099
2100 /*
2101 * Check whether we should continue using same modulation mode, or
2102 * begin search for a new mode, based on:
2103 * 1) # tx successes or failures while using this mode
2104 * 2) # times calling this function
2105 * 3) elapsed time in this mode (not used, for now)
2106 */
2107 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
2108 {
2109 struct iwl_scale_tbl_info *tbl;
2110 int i;
2111 int active_tbl;
2112 int flush_interval_passed = 0;
2113 struct iwl_priv *priv;
2114
2115 priv = lq_sta->drv;
2116 active_tbl = lq_sta->active_tbl;
2117
2118 tbl = &(lq_sta->lq_info[active_tbl]);
2119
2120 /* If we've been disallowing search, see if we should now allow it */
2121 if (lq_sta->stay_in_tbl) {
2122
2123 /* Elapsed time using current modulation mode */
2124 if (lq_sta->flush_timer)
2125 flush_interval_passed =
2126 time_after(jiffies,
2127 (unsigned long)(lq_sta->flush_timer +
2128 IWL_RATE_SCALE_FLUSH_INTVL));
2129
2130 /*
2131 * Check if we should allow search for new modulation mode.
2132 * If many frames have failed or succeeded, or we've used
2133 * this same modulation for a long time, allow search, and
2134 * reset history stats that keep track of whether we should
2135 * allow a new search. Also (below) reset all bitmaps and
2136 * stats in active history.
2137 */
2138 if (force_search ||
2139 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
2140 (lq_sta->total_success > lq_sta->max_success_limit) ||
2141 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
2142 && (flush_interval_passed))) {
2143 IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n",
2144 lq_sta->total_failed,
2145 lq_sta->total_success,
2146 flush_interval_passed);
2147
2148 /* Allow search for new mode */
2149 lq_sta->stay_in_tbl = 0; /* only place reset */
2150 lq_sta->total_failed = 0;
2151 lq_sta->total_success = 0;
2152 lq_sta->flush_timer = 0;
2153
2154 /*
2155 * Else if we've used this modulation mode enough repetitions
2156 * (regardless of elapsed time or success/failure), reset
2157 * history bitmaps and rate-specific stats for all rates in
2158 * active table.
2159 */
2160 } else {
2161 lq_sta->table_count++;
2162 if (lq_sta->table_count >=
2163 lq_sta->table_count_limit) {
2164 lq_sta->table_count = 0;
2165
2166 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
2167 for (i = 0; i < IWL_RATE_COUNT; i++)
2168 rs_rate_scale_clear_window(
2169 &(tbl->win[i]));
2170 }
2171 }
2172
2173 /* If transitioning to allow "search", reset all history
2174 * bitmaps and stats in active table (this will become the new
2175 * "search" table). */
2176 if (!lq_sta->stay_in_tbl) {
2177 for (i = 0; i < IWL_RATE_COUNT; i++)
2178 rs_rate_scale_clear_window(&(tbl->win[i]));
2179 }
2180 }
2181 }
2182
2183 /*
2184 * setup rate table in uCode
2185 */
2186 static void rs_update_rate_tbl(struct iwl_priv *priv,
2187 struct iwl_rxon_context *ctx,
2188 struct iwl_lq_sta *lq_sta,
2189 struct iwl_scale_tbl_info *tbl,
2190 int index, u8 is_green)
2191 {
2192 u32 rate;
2193
2194 /* Update uCode's rate table. */
2195 rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2196 rs_fill_link_cmd(priv, lq_sta, rate);
2197 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2198 }
2199
2200 /*
2201 * Do rate scaling and search for new modulation mode.
2202 */
2203 static void rs_rate_scale_perform(struct iwl_priv *priv,
2204 struct sk_buff *skb,
2205 struct ieee80211_sta *sta,
2206 struct iwl_lq_sta *lq_sta)
2207 {
2208 struct ieee80211_hw *hw = priv->hw;
2209 struct ieee80211_conf *conf = &hw->conf;
2210 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2211 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2212 int low = IWL_RATE_INVALID;
2213 int high = IWL_RATE_INVALID;
2214 int index;
2215 int i;
2216 struct iwl_rate_scale_data *window = NULL;
2217 int current_tpt = IWL_INVALID_VALUE;
2218 int low_tpt = IWL_INVALID_VALUE;
2219 int high_tpt = IWL_INVALID_VALUE;
2220 u32 fail_count;
2221 s8 scale_action = 0;
2222 u16 rate_mask;
2223 u8 update_lq = 0;
2224 struct iwl_scale_tbl_info *tbl, *tbl1;
2225 u16 rate_scale_index_msk = 0;
2226 u8 is_green = 0;
2227 u8 active_tbl = 0;
2228 u8 done_search = 0;
2229 u16 high_low;
2230 s32 sr;
2231 u8 tid = IWL_MAX_TID_COUNT;
2232 struct iwl_tid_data *tid_data;
2233 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
2234 struct iwl_rxon_context *ctx = sta_priv->ctx;
2235
2236 IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
2237
2238 /* Send management frames and NO_ACK data using lowest rate. */
2239 /* TODO: this could probably be improved.. */
2240 if (!ieee80211_is_data(hdr->frame_control) ||
2241 info->flags & IEEE80211_TX_CTL_NO_ACK)
2242 return;
2243
2244 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
2245
2246 tid = rs_tl_add_packet(lq_sta, hdr);
2247 if ((tid != IWL_MAX_TID_COUNT) &&
2248 (lq_sta->tx_agg_tid_en & (1 << tid))) {
2249 tid_data = &priv->tid_data[lq_sta->lq.sta_id][tid];
2250 if (tid_data->agg.state == IWL_AGG_OFF)
2251 lq_sta->is_agg = 0;
2252 else
2253 lq_sta->is_agg = 1;
2254 } else
2255 lq_sta->is_agg = 0;
2256
2257 /*
2258 * Select rate-scale / modulation-mode table to work with in
2259 * the rest of this function: "search" if searching for better
2260 * modulation mode, or "active" if doing rate scaling within a mode.
2261 */
2262 if (!lq_sta->search_better_tbl)
2263 active_tbl = lq_sta->active_tbl;
2264 else
2265 active_tbl = 1 - lq_sta->active_tbl;
2266
2267 tbl = &(lq_sta->lq_info[active_tbl]);
2268 if (is_legacy(tbl->lq_type))
2269 lq_sta->is_green = 0;
2270 else
2271 lq_sta->is_green = rs_use_green(sta);
2272 is_green = lq_sta->is_green;
2273
2274 /* current tx rate */
2275 index = lq_sta->last_txrate_idx;
2276
2277 IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2278 tbl->lq_type);
2279
2280 /* rates available for this association, and for modulation mode */
2281 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2282
2283 IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
2284
2285 /* mask with station rate restriction */
2286 if (is_legacy(tbl->lq_type)) {
2287 if (lq_sta->band == NL80211_BAND_5GHZ)
2288 /* supp_rates has no CCK bits in A mode */
2289 rate_scale_index_msk = (u16) (rate_mask &
2290 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2291 else
2292 rate_scale_index_msk = (u16) (rate_mask &
2293 lq_sta->supp_rates);
2294
2295 } else
2296 rate_scale_index_msk = rate_mask;
2297
2298 if (!rate_scale_index_msk)
2299 rate_scale_index_msk = rate_mask;
2300
2301 if (!((1 << index) & rate_scale_index_msk)) {
2302 IWL_ERR(priv, "Current Rate is not valid\n");
2303 if (lq_sta->search_better_tbl) {
2304 /* revert to active table if search table is not valid*/
2305 tbl->lq_type = LQ_NONE;
2306 lq_sta->search_better_tbl = 0;
2307 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2308 /* get "active" rate info */
2309 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2310 rs_update_rate_tbl(priv, ctx, lq_sta, tbl,
2311 index, is_green);
2312 }
2313 return;
2314 }
2315
2316 /* Get expected throughput table and history window for current rate */
2317 if (!tbl->expected_tpt) {
2318 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2319 return;
2320 }
2321
2322 /* force user max rate if set by user */
2323 if ((lq_sta->max_rate_idx != -1) &&
2324 (lq_sta->max_rate_idx < index)) {
2325 index = lq_sta->max_rate_idx;
2326 update_lq = 1;
2327 window = &(tbl->win[index]);
2328 goto lq_update;
2329 }
2330
2331 window = &(tbl->win[index]);
2332
2333 /*
2334 * If there is not enough history to calculate actual average
2335 * throughput, keep analyzing results of more tx frames, without
2336 * changing rate or mode (bypass most of the rest of this function).
2337 * Set up new rate table in uCode only if old rate is not supported
2338 * in current association (use new rate found above).
2339 */
2340 fail_count = window->counter - window->success_counter;
2341 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2342 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2343 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2344 "for index %d\n",
2345 window->success_counter, window->counter, index);
2346
2347 /* Can't calculate this yet; not enough history */
2348 window->average_tpt = IWL_INVALID_VALUE;
2349
2350 /* Should we stay with this modulation mode,
2351 * or search for a new one? */
2352 rs_stay_in_table(lq_sta, false);
2353
2354 goto out;
2355 }
2356 /* Else we have enough samples; calculate estimate of
2357 * actual average throughput */
2358 if (window->average_tpt != ((window->success_ratio *
2359 tbl->expected_tpt[index] + 64) / 128)) {
2360 IWL_ERR(priv, "expected_tpt should have been calculated by now\n");
2361 window->average_tpt = ((window->success_ratio *
2362 tbl->expected_tpt[index] + 64) / 128);
2363 }
2364
2365 /* If we are searching for better modulation mode, check success. */
2366 if (lq_sta->search_better_tbl &&
2367 (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
2368 /* If good success, continue using the "search" mode;
2369 * no need to send new link quality command, since we're
2370 * continuing to use the setup that we've been trying. */
2371 if (window->average_tpt > lq_sta->last_tpt) {
2372
2373 IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2374 "suc=%d cur-tpt=%d old-tpt=%d\n",
2375 window->success_ratio,
2376 window->average_tpt,
2377 lq_sta->last_tpt);
2378
2379 if (!is_legacy(tbl->lq_type))
2380 lq_sta->enable_counter = 1;
2381
2382 /* Swap tables; "search" becomes "active" */
2383 lq_sta->active_tbl = active_tbl;
2384 current_tpt = window->average_tpt;
2385
2386 /* Else poor success; go back to mode in "active" table */
2387 } else {
2388
2389 IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2390 "suc=%d cur-tpt=%d old-tpt=%d\n",
2391 window->success_ratio,
2392 window->average_tpt,
2393 lq_sta->last_tpt);
2394
2395 /* Nullify "search" table */
2396 tbl->lq_type = LQ_NONE;
2397
2398 /* Revert to "active" table */
2399 active_tbl = lq_sta->active_tbl;
2400 tbl = &(lq_sta->lq_info[active_tbl]);
2401
2402 /* Revert to "active" rate and throughput info */
2403 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2404 current_tpt = lq_sta->last_tpt;
2405
2406 /* Need to set up a new rate table in uCode */
2407 update_lq = 1;
2408 }
2409
2410 /* Either way, we've made a decision; modulation mode
2411 * search is done, allow rate adjustment next time. */
2412 lq_sta->search_better_tbl = 0;
2413 done_search = 1; /* Don't switch modes below! */
2414 goto lq_update;
2415 }
2416
2417 /* (Else) not in search of better modulation mode, try for better
2418 * starting rate, while staying in this mode. */
2419 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2420 tbl->lq_type);
2421 low = high_low & 0xff;
2422 high = (high_low >> 8) & 0xff;
2423
2424 /* If user set max rate, dont allow higher than user constrain */
2425 if ((lq_sta->max_rate_idx != -1) &&
2426 (lq_sta->max_rate_idx < high))
2427 high = IWL_RATE_INVALID;
2428
2429 sr = window->success_ratio;
2430
2431 /* Collect measured throughputs for current and adjacent rates */
2432 current_tpt = window->average_tpt;
2433 if (low != IWL_RATE_INVALID)
2434 low_tpt = tbl->win[low].average_tpt;
2435 if (high != IWL_RATE_INVALID)
2436 high_tpt = tbl->win[high].average_tpt;
2437
2438 scale_action = 0;
2439
2440 /* Too many failures, decrease rate */
2441 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2442 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2443 scale_action = -1;
2444
2445 /* No throughput measured yet for adjacent rates; try increase. */
2446 } else if ((low_tpt == IWL_INVALID_VALUE) &&
2447 (high_tpt == IWL_INVALID_VALUE)) {
2448
2449 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2450 scale_action = 1;
2451 else if (low != IWL_RATE_INVALID)
2452 scale_action = 0;
2453 }
2454
2455 /* Both adjacent throughputs are measured, but neither one has better
2456 * throughput; we're using the best rate, don't change it! */
2457 else if ((low_tpt != IWL_INVALID_VALUE) &&
2458 (high_tpt != IWL_INVALID_VALUE) &&
2459 (low_tpt < current_tpt) &&
2460 (high_tpt < current_tpt))
2461 scale_action = 0;
2462
2463 /* At least one adjacent rate's throughput is measured,
2464 * and may have better performance. */
2465 else {
2466 /* Higher adjacent rate's throughput is measured */
2467 if (high_tpt != IWL_INVALID_VALUE) {
2468 /* Higher rate has better throughput */
2469 if (high_tpt > current_tpt &&
2470 sr >= IWL_RATE_INCREASE_TH) {
2471 scale_action = 1;
2472 } else {
2473 scale_action = 0;
2474 }
2475
2476 /* Lower adjacent rate's throughput is measured */
2477 } else if (low_tpt != IWL_INVALID_VALUE) {
2478 /* Lower rate has better throughput */
2479 if (low_tpt > current_tpt) {
2480 IWL_DEBUG_RATE(priv,
2481 "decrease rate because of low tpt\n");
2482 scale_action = -1;
2483 } else if (sr >= IWL_RATE_INCREASE_TH) {
2484 scale_action = 1;
2485 }
2486 }
2487 }
2488
2489 /* Sanity check; asked for decrease, but success rate or throughput
2490 * has been good at old rate. Don't change it. */
2491 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2492 ((sr > IWL_RATE_HIGH_TH) ||
2493 (current_tpt > (100 * tbl->expected_tpt[low]))))
2494 scale_action = 0;
2495 if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2496 scale_action = -1;
2497 if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
2498 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2499 scale_action = -1;
2500
2501 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2502 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2503 if (lq_sta->last_bt_traffic > priv->bt_traffic_load) {
2504 /*
2505 * don't set scale_action, don't want to scale up if
2506 * the rate scale doesn't otherwise think that is a
2507 * good idea.
2508 */
2509 } else if (lq_sta->last_bt_traffic <= priv->bt_traffic_load) {
2510 scale_action = -1;
2511 }
2512 }
2513 lq_sta->last_bt_traffic = priv->bt_traffic_load;
2514
2515 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2516 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2517 /* search for a new modulation */
2518 rs_stay_in_table(lq_sta, true);
2519 goto lq_update;
2520 }
2521
2522 switch (scale_action) {
2523 case -1:
2524 /* Decrease starting rate, update uCode's rate table */
2525 if (low != IWL_RATE_INVALID) {
2526 update_lq = 1;
2527 index = low;
2528 }
2529
2530 break;
2531 case 1:
2532 /* Increase starting rate, update uCode's rate table */
2533 if (high != IWL_RATE_INVALID) {
2534 update_lq = 1;
2535 index = high;
2536 }
2537
2538 break;
2539 case 0:
2540 /* No change */
2541 default:
2542 break;
2543 }
2544
2545 IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2546 "high %d type %d\n",
2547 index, scale_action, low, high, tbl->lq_type);
2548
2549 lq_update:
2550 /* Replace uCode's rate table for the destination station. */
2551 if (update_lq)
2552 rs_update_rate_tbl(priv, ctx, lq_sta, tbl, index, is_green);
2553
2554 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
2555 /* Should we stay with this modulation mode,
2556 * or search for a new one? */
2557 rs_stay_in_table(lq_sta, false);
2558 }
2559 /*
2560 * Search for new modulation mode if we're:
2561 * 1) Not changing rates right now
2562 * 2) Not just finishing up a search
2563 * 3) Allowing a new search
2564 */
2565 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2566 /* Save current throughput to compare with "search" throughput*/
2567 lq_sta->last_tpt = current_tpt;
2568
2569 /* Select a new "search" modulation mode to try.
2570 * If one is found, set up the new "search" table. */
2571 if (is_legacy(tbl->lq_type))
2572 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2573 else if (is_siso(tbl->lq_type))
2574 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2575 else if (is_mimo2(tbl->lq_type))
2576 rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2577 else
2578 rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2579
2580 /* If new "search" mode was selected, set up in uCode table */
2581 if (lq_sta->search_better_tbl) {
2582 /* Access the "search" table, clear its history. */
2583 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2584 for (i = 0; i < IWL_RATE_COUNT; i++)
2585 rs_rate_scale_clear_window(&(tbl->win[i]));
2586
2587 /* Use new "search" start rate */
2588 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2589
2590 IWL_DEBUG_RATE(priv, "Switch current mcs: %X index: %d\n",
2591 tbl->current_rate, index);
2592 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2593 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2594 } else
2595 done_search = 1;
2596 }
2597
2598 if (done_search && !lq_sta->stay_in_tbl) {
2599 /* If the "active" (non-search) mode was legacy,
2600 * and we've tried switching antennas,
2601 * but we haven't been able to try HT modes (not available),
2602 * stay with best antenna legacy modulation for a while
2603 * before next round of mode comparisons. */
2604 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2605 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2606 lq_sta->action_counter > tbl1->max_search) {
2607 IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2608 rs_set_stay_in_table(priv, 1, lq_sta);
2609 }
2610
2611 /* If we're in an HT mode, and all 3 mode switch actions
2612 * have been tried and compared, stay in this best modulation
2613 * mode for a while before next round of mode comparisons. */
2614 if (lq_sta->enable_counter &&
2615 (lq_sta->action_counter >= tbl1->max_search) &&
2616 iwl_ht_enabled(priv)) {
2617 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2618 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2619 (tid != IWL_MAX_TID_COUNT)) {
2620 u8 sta_id = lq_sta->lq.sta_id;
2621 tid_data = &priv->tid_data[sta_id][tid];
2622 if (tid_data->agg.state == IWL_AGG_OFF) {
2623 IWL_DEBUG_RATE(priv,
2624 "try to aggregate tid %d\n",
2625 tid);
2626 rs_tl_turn_on_agg(priv, tid,
2627 lq_sta, sta);
2628 }
2629 }
2630 rs_set_stay_in_table(priv, 0, lq_sta);
2631 }
2632 }
2633
2634 out:
2635 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2636 lq_sta->last_txrate_idx = index;
2637 }
2638
2639 /**
2640 * rs_initialize_lq - Initialize a station's hardware rate table
2641 *
2642 * The uCode's station table contains a table of fallback rates
2643 * for automatic fallback during transmission.
2644 *
2645 * NOTE: This sets up a default set of values. These will be replaced later
2646 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2647 * rc80211_simple.
2648 *
2649 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2650 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2651 * which requires station table entry to exist).
2652 */
2653 static void rs_initialize_lq(struct iwl_priv *priv,
2654 struct ieee80211_sta *sta,
2655 struct iwl_lq_sta *lq_sta)
2656 {
2657 struct iwl_scale_tbl_info *tbl;
2658 int rate_idx;
2659 int i;
2660 u32 rate;
2661 u8 use_green = rs_use_green(sta);
2662 u8 active_tbl = 0;
2663 u8 valid_tx_ant;
2664 struct iwl_station_priv *sta_priv;
2665 struct iwl_rxon_context *ctx;
2666
2667 if (!sta || !lq_sta)
2668 return;
2669
2670 sta_priv = (void *)sta->drv_priv;
2671 ctx = sta_priv->ctx;
2672
2673 i = lq_sta->last_txrate_idx;
2674
2675 valid_tx_ant = priv->nvm_data->valid_tx_ant;
2676
2677 if (!lq_sta->search_better_tbl)
2678 active_tbl = lq_sta->active_tbl;
2679 else
2680 active_tbl = 1 - lq_sta->active_tbl;
2681
2682 tbl = &(lq_sta->lq_info[active_tbl]);
2683
2684 if ((i < 0) || (i >= IWL_RATE_COUNT))
2685 i = 0;
2686
2687 rate = iwl_rates[i].plcp;
2688 tbl->ant_type = first_antenna(valid_tx_ant);
2689 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2690
2691 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2692 rate |= RATE_MCS_CCK_MSK;
2693
2694 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2695 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2696 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2697
2698 rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2699 tbl->current_rate = rate;
2700 rs_set_expected_tpt_table(lq_sta, tbl);
2701 rs_fill_link_cmd(NULL, lq_sta, rate);
2702 priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2703 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, 0, true);
2704 }
2705
2706 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2707 struct ieee80211_tx_rate_control *txrc)
2708 {
2709
2710 struct sk_buff *skb = txrc->skb;
2711 struct ieee80211_supported_band *sband = txrc->sband;
2712 struct iwl_op_mode *op_mode __maybe_unused =
2713 (struct iwl_op_mode *)priv_r;
2714 struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
2715 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2716 struct iwl_lq_sta *lq_sta = priv_sta;
2717 int rate_idx;
2718
2719 IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2720
2721 /* Get max rate if user set max rate */
2722 if (lq_sta) {
2723 lq_sta->max_rate_idx = txrc->max_rate_idx;
2724 if ((sband->band == NL80211_BAND_5GHZ) &&
2725 (lq_sta->max_rate_idx != -1))
2726 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2727 if ((lq_sta->max_rate_idx < 0) ||
2728 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2729 lq_sta->max_rate_idx = -1;
2730 }
2731
2732 /* Treat uninitialized rate scaling data same as non-existing. */
2733 if (lq_sta && !lq_sta->drv) {
2734 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
2735 priv_sta = NULL;
2736 }
2737
2738 /* Send management frames and NO_ACK data using lowest rate. */
2739 if (rate_control_send_low(sta, priv_sta, txrc))
2740 return;
2741
2742 rate_idx = lq_sta->last_txrate_idx;
2743
2744 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2745 rate_idx -= IWL_FIRST_OFDM_RATE;
2746 /* 6M and 9M shared same MCS index */
2747 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2748 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2749 IWL_RATE_MIMO3_6M_PLCP)
2750 rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2751 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2752 IWL_RATE_MIMO2_6M_PLCP)
2753 rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2754 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2755 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2756 info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2757 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2758 info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
2759 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2760 info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2761 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2762 info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2763 } else {
2764 /* Check for invalid rates */
2765 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2766 ((sband->band == NL80211_BAND_5GHZ) &&
2767 (rate_idx < IWL_FIRST_OFDM_RATE)))
2768 rate_idx = rate_lowest_index(sband, sta);
2769 /* On valid 5 GHz rate, adjust index */
2770 else if (sband->band == NL80211_BAND_5GHZ)
2771 rate_idx -= IWL_FIRST_OFDM_RATE;
2772 info->control.rates[0].flags = 0;
2773 }
2774 info->control.rates[0].idx = rate_idx;
2775 info->control.rates[0].count = 1;
2776 }
2777
2778 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2779 gfp_t gfp)
2780 {
2781 struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2782 struct iwl_op_mode *op_mode __maybe_unused =
2783 (struct iwl_op_mode *)priv_rate;
2784 struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
2785
2786 IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2787
2788 return &sta_priv->lq_sta;
2789 }
2790
2791 /*
2792 * Called after adding a new station to initialize rate scaling
2793 */
2794 void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id)
2795 {
2796 int i, j;
2797 struct ieee80211_hw *hw = priv->hw;
2798 struct ieee80211_conf *conf = &priv->hw->conf;
2799 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2800 struct iwl_station_priv *sta_priv;
2801 struct iwl_lq_sta *lq_sta;
2802 struct ieee80211_supported_band *sband;
2803 unsigned long supp; /* must be unsigned long for for_each_set_bit */
2804
2805 sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2806 lq_sta = &sta_priv->lq_sta;
2807 sband = hw->wiphy->bands[conf->chandef.chan->band];
2808
2809
2810 lq_sta->lq.sta_id = sta_id;
2811
2812 for (j = 0; j < LQ_SIZE; j++)
2813 for (i = 0; i < IWL_RATE_COUNT; i++)
2814 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2815
2816 lq_sta->flush_timer = 0;
2817 lq_sta->supp_rates = sta->supp_rates[sband->band];
2818
2819 IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n",
2820 sta_id);
2821 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2822 * the lowest or the highest rate.. Could consider using RSSI from
2823 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2824 * after assoc.. */
2825
2826 lq_sta->is_dup = 0;
2827 lq_sta->max_rate_idx = -1;
2828 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2829 lq_sta->is_green = rs_use_green(sta);
2830 lq_sta->band = sband->band;
2831 /*
2832 * active legacy rates as per supported rates bitmap
2833 */
2834 supp = sta->supp_rates[sband->band];
2835 lq_sta->active_legacy_rate = 0;
2836 for_each_set_bit(i, &supp, BITS_PER_LONG)
2837 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2838
2839 /*
2840 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2841 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2842 */
2843 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2844 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2845 lq_sta->active_siso_rate &= ~((u16)0x2);
2846 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2847
2848 /* Same here */
2849 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2850 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2851 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2852 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2853
2854 lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2855 lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2856 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2857 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2858
2859 IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2860 lq_sta->active_siso_rate,
2861 lq_sta->active_mimo2_rate,
2862 lq_sta->active_mimo3_rate);
2863
2864 /* These values will be overridden later */
2865 lq_sta->lq.general_params.single_stream_ant_msk =
2866 first_antenna(priv->nvm_data->valid_tx_ant);
2867 lq_sta->lq.general_params.dual_stream_ant_msk =
2868 priv->nvm_data->valid_tx_ant &
2869 ~first_antenna(priv->nvm_data->valid_tx_ant);
2870 if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2871 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2872 } else if (num_of_ant(priv->nvm_data->valid_tx_ant) == 2) {
2873 lq_sta->lq.general_params.dual_stream_ant_msk =
2874 priv->nvm_data->valid_tx_ant;
2875 }
2876
2877 /* as default allow aggregation for all tids */
2878 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2879 lq_sta->drv = priv;
2880
2881 /* Set last_txrate_idx to lowest rate */
2882 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2883 if (sband->band == NL80211_BAND_5GHZ)
2884 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2885 lq_sta->is_agg = 0;
2886 #ifdef CONFIG_MAC80211_DEBUGFS
2887 lq_sta->dbg_fixed_rate = 0;
2888 #endif
2889
2890 rs_initialize_lq(priv, sta, lq_sta);
2891 }
2892
2893 static void rs_fill_link_cmd(struct iwl_priv *priv,
2894 struct iwl_lq_sta *lq_sta, u32 new_rate)
2895 {
2896 struct iwl_scale_tbl_info tbl_type;
2897 int index = 0;
2898 int rate_idx;
2899 int repeat_rate = 0;
2900 u8 ant_toggle_cnt = 0;
2901 u8 use_ht_possible = 1;
2902 u8 valid_tx_ant = 0;
2903 struct iwl_station_priv *sta_priv =
2904 container_of(lq_sta, struct iwl_station_priv, lq_sta);
2905 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2906
2907 /* Override starting rate (index 0) if needed for debug purposes */
2908 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2909
2910 /* Interpret new_rate (rate_n_flags) */
2911 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2912 &tbl_type, &rate_idx);
2913
2914 if (priv && priv->bt_full_concurrent) {
2915 /* 1x1 only */
2916 tbl_type.ant_type =
2917 first_antenna(priv->nvm_data->valid_tx_ant);
2918 }
2919
2920 /* How many times should we repeat the initial rate? */
2921 if (is_legacy(tbl_type.lq_type)) {
2922 ant_toggle_cnt = 1;
2923 repeat_rate = IWL_NUMBER_TRY;
2924 } else {
2925 repeat_rate = min(IWL_HT_NUMBER_TRY,
2926 LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2927 }
2928
2929 lq_cmd->general_params.mimo_delimiter =
2930 is_mimo(tbl_type.lq_type) ? 1 : 0;
2931
2932 /* Fill 1st table entry (index 0) */
2933 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2934
2935 if (num_of_ant(tbl_type.ant_type) == 1) {
2936 lq_cmd->general_params.single_stream_ant_msk =
2937 tbl_type.ant_type;
2938 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2939 lq_cmd->general_params.dual_stream_ant_msk =
2940 tbl_type.ant_type;
2941 } /* otherwise we don't modify the existing value */
2942
2943 index++;
2944 repeat_rate--;
2945 if (priv) {
2946 if (priv->bt_full_concurrent)
2947 valid_tx_ant = ANT_A;
2948 else
2949 valid_tx_ant = priv->nvm_data->valid_tx_ant;
2950 }
2951
2952 /* Fill rest of rate table */
2953 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2954 /* Repeat initial/next rate.
2955 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2956 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2957 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2958 if (is_legacy(tbl_type.lq_type)) {
2959 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2960 ant_toggle_cnt++;
2961 else if (priv &&
2962 rs_toggle_antenna(valid_tx_ant,
2963 &new_rate, &tbl_type))
2964 ant_toggle_cnt = 1;
2965 }
2966
2967 /* Override next rate if needed for debug purposes */
2968 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2969
2970 /* Fill next table entry */
2971 lq_cmd->rs_table[index].rate_n_flags =
2972 cpu_to_le32(new_rate);
2973 repeat_rate--;
2974 index++;
2975 }
2976
2977 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2978 &rate_idx);
2979
2980 if (priv && priv->bt_full_concurrent) {
2981 /* 1x1 only */
2982 tbl_type.ant_type =
2983 first_antenna(priv->nvm_data->valid_tx_ant);
2984 }
2985
2986 /* Indicate to uCode which entries might be MIMO.
2987 * If initial rate was MIMO, this will finally end up
2988 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2989 if (is_mimo(tbl_type.lq_type))
2990 lq_cmd->general_params.mimo_delimiter = index;
2991
2992 /* Get next rate */
2993 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2994 use_ht_possible);
2995
2996 /* How many times should we repeat the next rate? */
2997 if (is_legacy(tbl_type.lq_type)) {
2998 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2999 ant_toggle_cnt++;
3000 else if (priv &&
3001 rs_toggle_antenna(valid_tx_ant,
3002 &new_rate, &tbl_type))
3003 ant_toggle_cnt = 1;
3004
3005 repeat_rate = IWL_NUMBER_TRY;
3006 } else {
3007 repeat_rate = IWL_HT_NUMBER_TRY;
3008 }
3009
3010 /* Don't allow HT rates after next pass.
3011 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
3012 use_ht_possible = 0;
3013
3014 /* Override next rate if needed for debug purposes */
3015 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
3016
3017 /* Fill next table entry */
3018 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
3019
3020 index++;
3021 repeat_rate--;
3022 }
3023
3024 lq_cmd->agg_params.agg_frame_cnt_limit =
3025 sta_priv->max_agg_bufsize ?: LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3026 lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
3027
3028 lq_cmd->agg_params.agg_time_limit =
3029 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
3030 /*
3031 * overwrite if needed, pass aggregation time limit
3032 * to uCode in uSec
3033 */
3034 if (priv && priv->lib->bt_params &&
3035 priv->lib->bt_params->agg_time_limit &&
3036 priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH)
3037 lq_cmd->agg_params.agg_time_limit =
3038 cpu_to_le16(priv->lib->bt_params->agg_time_limit);
3039 }
3040
3041 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3042 {
3043 return hw->priv;
3044 }
3045 /* rate scale requires free function to be implemented */
3046 static void rs_free(void *priv_rate)
3047 {
3048 return;
3049 }
3050
3051 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
3052 void *priv_sta)
3053 {
3054 struct iwl_op_mode *op_mode __maybe_unused = priv_r;
3055 struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
3056
3057 IWL_DEBUG_RATE(priv, "enter\n");
3058 IWL_DEBUG_RATE(priv, "leave\n");
3059 }
3060
3061 #ifdef CONFIG_MAC80211_DEBUGFS
3062 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
3063 u32 *rate_n_flags, int index)
3064 {
3065 struct iwl_priv *priv;
3066 u8 valid_tx_ant;
3067 u8 ant_sel_tx;
3068
3069 priv = lq_sta->drv;
3070 valid_tx_ant = priv->nvm_data->valid_tx_ant;
3071 if (lq_sta->dbg_fixed_rate) {
3072 ant_sel_tx =
3073 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
3074 >> RATE_MCS_ANT_POS);
3075 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
3076 *rate_n_flags = lq_sta->dbg_fixed_rate;
3077 IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
3078 } else {
3079 lq_sta->dbg_fixed_rate = 0;
3080 IWL_ERR(priv,
3081 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
3082 ant_sel_tx, valid_tx_ant);
3083 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3084 }
3085 } else {
3086 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3087 }
3088 }
3089
3090 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3091 const char __user *user_buf, size_t count, loff_t *ppos)
3092 {
3093 struct iwl_lq_sta *lq_sta = file->private_data;
3094 struct iwl_priv *priv;
3095 char buf[64];
3096 size_t buf_size;
3097 u32 parsed_rate;
3098
3099
3100 priv = lq_sta->drv;
3101 memset(buf, 0, sizeof(buf));
3102 buf_size = min(count, sizeof(buf) - 1);
3103 if (copy_from_user(buf, user_buf, buf_size))
3104 return -EFAULT;
3105
3106 if (sscanf(buf, "%x", &parsed_rate) == 1)
3107 lq_sta->dbg_fixed_rate = parsed_rate;
3108 else
3109 lq_sta->dbg_fixed_rate = 0;
3110
3111 rs_program_fix_rate(priv, lq_sta);
3112
3113 return count;
3114 }
3115
3116 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3117 char __user *user_buf, size_t count, loff_t *ppos)
3118 {
3119 char *buff;
3120 int desc = 0;
3121 int i = 0;
3122 int index = 0;
3123 ssize_t ret;
3124
3125 struct iwl_lq_sta *lq_sta = file->private_data;
3126 struct iwl_priv *priv;
3127 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3128
3129 priv = lq_sta->drv;
3130 buff = kmalloc(1024, GFP_KERNEL);
3131 if (!buff)
3132 return -ENOMEM;
3133
3134 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3135 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
3136 lq_sta->total_failed, lq_sta->total_success,
3137 lq_sta->active_legacy_rate);
3138 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3139 lq_sta->dbg_fixed_rate);
3140 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3141 (priv->nvm_data->valid_tx_ant & ANT_A) ? "ANT_A," : "",
3142 (priv->nvm_data->valid_tx_ant & ANT_B) ? "ANT_B," : "",
3143 (priv->nvm_data->valid_tx_ant & ANT_C) ? "ANT_C" : "");
3144 desc += sprintf(buff+desc, "lq type %s\n",
3145 (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
3146 if (is_Ht(tbl->lq_type)) {
3147 desc += sprintf(buff + desc, " %s",
3148 (is_siso(tbl->lq_type)) ? "SISO" :
3149 ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
3150 desc += sprintf(buff + desc, " %s",
3151 (tbl->is_ht40) ? "40MHz" : "20MHz");
3152 desc += sprintf(buff + desc, " %s %s %s\n",
3153 (tbl->is_SGI) ? "SGI" : "",
3154 (lq_sta->is_green) ? "GF enabled" : "",
3155 (lq_sta->is_agg) ? "AGG on" : "");
3156 }
3157 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3158 lq_sta->last_rate_n_flags);
3159 desc += sprintf(buff+desc, "general:"
3160 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
3161 lq_sta->lq.general_params.flags,
3162 lq_sta->lq.general_params.mimo_delimiter,
3163 lq_sta->lq.general_params.single_stream_ant_msk,
3164 lq_sta->lq.general_params.dual_stream_ant_msk);
3165
3166 desc += sprintf(buff+desc, "agg:"
3167 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3168 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
3169 lq_sta->lq.agg_params.agg_dis_start_th,
3170 lq_sta->lq.agg_params.agg_frame_cnt_limit);
3171
3172 desc += sprintf(buff+desc,
3173 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3174 lq_sta->lq.general_params.start_rate_index[0],
3175 lq_sta->lq.general_params.start_rate_index[1],
3176 lq_sta->lq.general_params.start_rate_index[2],
3177 lq_sta->lq.general_params.start_rate_index[3]);
3178
3179 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3180 index = iwl_hwrate_to_plcp_idx(
3181 le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
3182 if (is_legacy(tbl->lq_type)) {
3183 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
3184 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3185 iwl_rate_mcs[index].mbps);
3186 } else {
3187 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
3188 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3189 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
3190 }
3191 }
3192
3193 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3194 kfree(buff);
3195 return ret;
3196 }
3197
3198 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3199 .write = rs_sta_dbgfs_scale_table_write,
3200 .read = rs_sta_dbgfs_scale_table_read,
3201 .open = simple_open,
3202 .llseek = default_llseek,
3203 };
3204 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3205 char __user *user_buf, size_t count, loff_t *ppos)
3206 {
3207 char *buff;
3208 int desc = 0;
3209 int i, j;
3210 ssize_t ret;
3211
3212 struct iwl_lq_sta *lq_sta = file->private_data;
3213
3214 buff = kmalloc(1024, GFP_KERNEL);
3215 if (!buff)
3216 return -ENOMEM;
3217
3218 for (i = 0; i < LQ_SIZE; i++) {
3219 desc += sprintf(buff+desc,
3220 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
3221 "rate=0x%X\n",
3222 lq_sta->active_tbl == i ? "*" : "x",
3223 lq_sta->lq_info[i].lq_type,
3224 lq_sta->lq_info[i].is_SGI,
3225 lq_sta->lq_info[i].is_ht40,
3226 lq_sta->lq_info[i].is_dup,
3227 lq_sta->is_green,
3228 lq_sta->lq_info[i].current_rate);
3229 for (j = 0; j < IWL_RATE_COUNT; j++) {
3230 desc += sprintf(buff+desc,
3231 "counter=%d success=%d %%=%d\n",
3232 lq_sta->lq_info[i].win[j].counter,
3233 lq_sta->lq_info[i].win[j].success_counter,
3234 lq_sta->lq_info[i].win[j].success_ratio);
3235 }
3236 }
3237 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3238 kfree(buff);
3239 return ret;
3240 }
3241
3242 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3243 .read = rs_sta_dbgfs_stats_table_read,
3244 .open = simple_open,
3245 .llseek = default_llseek,
3246 };
3247
3248 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3249 char __user *user_buf, size_t count, loff_t *ppos)
3250 {
3251 struct iwl_lq_sta *lq_sta = file->private_data;
3252 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3253 char buff[120];
3254 int desc = 0;
3255
3256 if (is_Ht(tbl->lq_type))
3257 desc += sprintf(buff+desc,
3258 "Bit Rate= %d Mb/s\n",
3259 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3260 else
3261 desc += sprintf(buff+desc,
3262 "Bit Rate= %d Mb/s\n",
3263 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3264
3265 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3266 }
3267
3268 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3269 .read = rs_sta_dbgfs_rate_scale_data_read,
3270 .open = simple_open,
3271 .llseek = default_llseek,
3272 };
3273
3274 static void rs_add_debugfs(void *priv, void *priv_sta,
3275 struct dentry *dir)
3276 {
3277 struct iwl_lq_sta *lq_sta = priv_sta;
3278 lq_sta->rs_sta_dbgfs_scale_table_file =
3279 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3280 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3281 lq_sta->rs_sta_dbgfs_stats_table_file =
3282 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3283 lq_sta, &rs_sta_dbgfs_stats_table_ops);
3284 lq_sta->rs_sta_dbgfs_rate_scale_data_file =
3285 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
3286 lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
3287 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
3288 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3289 &lq_sta->tx_agg_tid_en);
3290
3291 }
3292
3293 static void rs_remove_debugfs(void *priv, void *priv_sta)
3294 {
3295 struct iwl_lq_sta *lq_sta = priv_sta;
3296 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3297 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
3298 debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
3299 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
3300 }
3301 #endif
3302
3303 /*
3304 * Initialization of rate scaling information is done by driver after
3305 * the station is added. Since mac80211 calls this function before a
3306 * station is added we ignore it.
3307 */
3308 static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband,
3309 struct cfg80211_chan_def *chandef,
3310 struct ieee80211_sta *sta, void *priv_sta)
3311 {
3312 }
3313
3314 static const struct rate_control_ops rs_ops = {
3315 .name = RS_NAME,
3316 .tx_status = rs_tx_status,
3317 .get_rate = rs_get_rate,
3318 .rate_init = rs_rate_init_stub,
3319 .alloc = rs_alloc,
3320 .free = rs_free,
3321 .alloc_sta = rs_alloc_sta,
3322 .free_sta = rs_free_sta,
3323 #ifdef CONFIG_MAC80211_DEBUGFS
3324 .add_sta_debugfs = rs_add_debugfs,
3325 .remove_sta_debugfs = rs_remove_debugfs,
3326 #endif
3327 };
3328
3329 int iwlagn_rate_control_register(void)
3330 {
3331 return ieee80211_rate_control_register(&rs_ops);
3332 }
3333
3334 void iwlagn_rate_control_unregister(void)
3335 {
3336 ieee80211_rate_control_unregister(&rs_ops);
3337 }
3338
Linux with added FPC-III support