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iwlwifi: update BT traffic load states correctly
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / net / wireless / iwlwifi / iwl-agn-rs.c
blob2aed7a05e2cd9f93bf727671a72e4378008dfc67
1 /******************************************************************************
2 *
3 * Copyright(c) 2005 - 2011 Intel Corporation. All rights reserved.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2 of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
17 *
18 * The full GNU General Public License is included in this distribution in the
19 * file called LICENSE.
20 *
21 * Contact Information:
22 * Intel Linux Wireless <ilw@linux.intel.com>
23 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
24 *
25 *****************************************************************************/
26 #include <linux/kernel.h>
27 #include <linux/init.h>
28 #include <linux/skbuff.h>
29 #include <linux/slab.h>
30 #include <linux/wireless.h>
31 #include <net/mac80211.h>
32
33 #include <linux/netdevice.h>
34 #include <linux/etherdevice.h>
35 #include <linux/delay.h>
36
37 #include <linux/workqueue.h>
38
39 #include "iwl-dev.h"
40 #include "iwl-sta.h"
41 #include "iwl-core.h"
42 #include "iwl-agn.h"
43
44 #define RS_NAME "iwl-agn-rs"
45
46 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
47 #define IWL_NUMBER_TRY 1
48 #define IWL_HT_NUMBER_TRY 3
49
50 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
51 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
52 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
53
54 /* max allowed rate miss before sync LQ cmd */
55 #define IWL_MISSED_RATE_MAX 15
56 /* max time to accum history 2 seconds */
57 #define IWL_RATE_SCALE_FLUSH_INTVL (3*HZ)
58
59 static u8 rs_ht_to_legacy[] = {
60 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
61 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
62 IWL_RATE_6M_INDEX,
63 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
64 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
65 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
66 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
67 };
68
69 static const u8 ant_toggle_lookup[] = {
70 /*ANT_NONE -> */ ANT_NONE,
71 /*ANT_A -> */ ANT_B,
72 /*ANT_B -> */ ANT_C,
73 /*ANT_AB -> */ ANT_BC,
74 /*ANT_C -> */ ANT_A,
75 /*ANT_AC -> */ ANT_AB,
76 /*ANT_BC -> */ ANT_AC,
77 /*ANT_ABC -> */ ANT_ABC,
78 };
79
80 #define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np) \
81 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
82 IWL_RATE_SISO_##s##M_PLCP, \
83 IWL_RATE_MIMO2_##s##M_PLCP,\
84 IWL_RATE_MIMO3_##s##M_PLCP,\
85 IWL_RATE_##r##M_IEEE, \
86 IWL_RATE_##ip##M_INDEX, \
87 IWL_RATE_##in##M_INDEX, \
88 IWL_RATE_##rp##M_INDEX, \
89 IWL_RATE_##rn##M_INDEX, \
90 IWL_RATE_##pp##M_INDEX, \
91 IWL_RATE_##np##M_INDEX }
92
93 /*
94 * Parameter order:
95 * rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
96 *
97 * If there isn't a valid next or previous rate then INV is used which
98 * maps to IWL_RATE_INVALID
99 *
100 */
101 const struct iwl_rate_info iwl_rates[IWL_RATE_COUNT] = {
102 IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2), /* 1mbps */
103 IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5), /* 2mbps */
104 IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11), /*5.5mbps */
105 IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18), /* 11mbps */
106 IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11), /* 6mbps */
107 IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11), /* 9mbps */
108 IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18), /* 12mbps */
109 IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24), /* 18mbps */
110 IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36), /* 24mbps */
111 IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48), /* 36mbps */
112 IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54), /* 48mbps */
113 IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
114 IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
115 /* FIXME:RS: ^^ should be INV (legacy) */
116 };
117
118 static inline u8 rs_extract_rate(u32 rate_n_flags)
119 {
120 return (u8)(rate_n_flags & RATE_MCS_RATE_MSK);
121 }
122
123 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
124 {
125 int idx = 0;
126
127 /* HT rate format */
128 if (rate_n_flags & RATE_MCS_HT_MSK) {
129 idx = rs_extract_rate(rate_n_flags);
130
131 if (idx >= IWL_RATE_MIMO3_6M_PLCP)
132 idx = idx - IWL_RATE_MIMO3_6M_PLCP;
133 else if (idx >= IWL_RATE_MIMO2_6M_PLCP)
134 idx = idx - IWL_RATE_MIMO2_6M_PLCP;
135
136 idx += IWL_FIRST_OFDM_RATE;
137 /* skip 9M not supported in ht*/
138 if (idx >= IWL_RATE_9M_INDEX)
139 idx += 1;
140 if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE))
141 return idx;
142
143 /* legacy rate format, search for match in table */
144 } else {
145 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
146 if (iwl_rates[idx].plcp ==
147 rs_extract_rate(rate_n_flags))
148 return idx;
149 }
150
151 return -1;
152 }
153
154 static void rs_rate_scale_perform(struct iwl_priv *priv,
155 struct sk_buff *skb,
156 struct ieee80211_sta *sta,
157 struct iwl_lq_sta *lq_sta);
158 static void rs_fill_link_cmd(struct iwl_priv *priv,
159 struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
160 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
161
162
163 #ifdef CONFIG_MAC80211_DEBUGFS
164 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
165 u32 *rate_n_flags, int index);
166 #else
167 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
168 u32 *rate_n_flags, int index)
169 {}
170 #endif
171
172 /**
173 * The following tables contain the expected throughput metrics for all rates
174 *
175 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
176 *
177 * where invalid entries are zeros.
178 *
179 * CCK rates are only valid in legacy table and will only be used in G
180 * (2.4 GHz) band.
181 */
182
183 static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
184 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
185 };
186
187 static s32 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
188 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202}, /* Norm */
189 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210}, /* SGI */
190 {0, 0, 0, 0, 47, 0, 91, 133, 171, 242, 305, 334, 362}, /* AGG */
191 {0, 0, 0, 0, 52, 0, 101, 145, 187, 264, 330, 361, 390}, /* AGG+SGI */
192 };
193
194 static s32 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
195 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
196 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
197 {0, 0, 0, 0, 94, 0, 177, 249, 313, 423, 512, 550, 586}, /* AGG */
198 {0, 0, 0, 0, 104, 0, 193, 270, 338, 454, 545, 584, 620}, /* AGG+SGI */
199 };
200
201 static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
202 {0, 0, 0, 0, 74, 0, 123, 155, 179, 214, 236, 244, 251}, /* Norm */
203 {0, 0, 0, 0, 81, 0, 131, 164, 188, 223, 243, 251, 257}, /* SGI */
204 {0, 0, 0, 0, 89, 0, 167, 235, 296, 402, 488, 526, 560}, /* AGG */
205 {0, 0, 0, 0, 97, 0, 182, 255, 320, 431, 520, 558, 593}, /* AGG+SGI*/
206 };
207
208 static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
209 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
210 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
211 {0, 0, 0, 0, 171, 0, 305, 410, 496, 634, 731, 771, 805}, /* AGG */
212 {0, 0, 0, 0, 186, 0, 329, 439, 527, 667, 764, 803, 838}, /* AGG+SGI */
213 };
214
215 static s32 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = {
216 {0, 0, 0, 0, 99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */
217 {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */
218 {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */
219 {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */
220 };
221
222 static s32 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = {
223 {0, 0, 0, 0, 152, 0, 211, 239, 255, 279, 290, 294, 297}, /* Norm */
224 {0, 0, 0, 0, 160, 0, 219, 245, 261, 284, 294, 297, 300}, /* SGI */
225 {0, 0, 0, 0, 254, 0, 443, 584, 695, 868, 984, 1030, 1070}, /* AGG */
226 {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */
227 };
228
229 /* mbps, mcs */
230 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
231 { "1", "BPSK DSSS"},
232 { "2", "QPSK DSSS"},
233 {"5.5", "BPSK CCK"},
234 { "11", "QPSK CCK"},
235 { "6", "BPSK 1/2"},
236 { "9", "BPSK 1/2"},
237 { "12", "QPSK 1/2"},
238 { "18", "QPSK 3/4"},
239 { "24", "16QAM 1/2"},
240 { "36", "16QAM 3/4"},
241 { "48", "64QAM 2/3"},
242 { "54", "64QAM 3/4"},
243 { "60", "64QAM 5/6"},
244 };
245
246 #define MCS_INDEX_PER_STREAM (8)
247
248 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
249 {
250 window->data = 0;
251 window->success_counter = 0;
252 window->success_ratio = IWL_INVALID_VALUE;
253 window->counter = 0;
254 window->average_tpt = IWL_INVALID_VALUE;
255 window->stamp = 0;
256 }
257
258 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
259 {
260 return (ant_type & valid_antenna) == ant_type;
261 }
262
263 /*
264 * removes the old data from the statistics. All data that is older than
265 * TID_MAX_TIME_DIFF, will be deleted.
266 */
267 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
268 {
269 /* The oldest age we want to keep */
270 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
271
272 while (tl->queue_count &&
273 (tl->time_stamp < oldest_time)) {
274 tl->total -= tl->packet_count[tl->head];
275 tl->packet_count[tl->head] = 0;
276 tl->time_stamp += TID_QUEUE_CELL_SPACING;
277 tl->queue_count--;
278 tl->head++;
279 if (tl->head >= TID_QUEUE_MAX_SIZE)
280 tl->head = 0;
281 }
282 }
283
284 /*
285 * increment traffic load value for tid and also remove
286 * any old values if passed the certain time period
287 */
288 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
289 struct ieee80211_hdr *hdr)
290 {
291 u32 curr_time = jiffies_to_msecs(jiffies);
292 u32 time_diff;
293 s32 index;
294 struct iwl_traffic_load *tl = NULL;
295 u8 tid;
296
297 if (ieee80211_is_data_qos(hdr->frame_control)) {
298 u8 *qc = ieee80211_get_qos_ctl(hdr);
299 tid = qc[0] & 0xf;
300 } else
301 return MAX_TID_COUNT;
302
303 if (unlikely(tid >= TID_MAX_LOAD_COUNT))
304 return MAX_TID_COUNT;
305
306 tl = &lq_data->load[tid];
307
308 curr_time -= curr_time % TID_ROUND_VALUE;
309
310 /* Happens only for the first packet. Initialize the data */
311 if (!(tl->queue_count)) {
312 tl->total = 1;
313 tl->time_stamp = curr_time;
314 tl->queue_count = 1;
315 tl->head = 0;
316 tl->packet_count[0] = 1;
317 return MAX_TID_COUNT;
318 }
319
320 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
321 index = time_diff / TID_QUEUE_CELL_SPACING;
322
323 /* The history is too long: remove data that is older than */
324 /* TID_MAX_TIME_DIFF */
325 if (index >= TID_QUEUE_MAX_SIZE)
326 rs_tl_rm_old_stats(tl, curr_time);
327
328 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
329 tl->packet_count[index] = tl->packet_count[index] + 1;
330 tl->total = tl->total + 1;
331
332 if ((index + 1) > tl->queue_count)
333 tl->queue_count = index + 1;
334
335 return tid;
336 }
337
338 #ifdef CONFIG_MAC80211_DEBUGFS
339 static void rs_program_fix_rate(struct iwl_priv *priv,
340 struct iwl_lq_sta *lq_sta)
341 {
342 struct iwl_station_priv *sta_priv =
343 container_of(lq_sta, struct iwl_station_priv, lq_sta);
344 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
345
346 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
347 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
348 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
349 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
350
351 lq_sta->dbg_fixed_rate = priv->dbg_fixed_rate;
352
353 IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
354 lq_sta->lq.sta_id, priv->dbg_fixed_rate);
355
356 if (priv->dbg_fixed_rate) {
357 rs_fill_link_cmd(NULL, lq_sta, priv->dbg_fixed_rate);
358 iwl_send_lq_cmd(lq_sta->drv, ctx, &lq_sta->lq, CMD_ASYNC,
359 false);
360 }
361 }
362 #endif
363
364 /*
365 get the traffic load value for tid
366 */
367 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
368 {
369 u32 curr_time = jiffies_to_msecs(jiffies);
370 u32 time_diff;
371 s32 index;
372 struct iwl_traffic_load *tl = NULL;
373
374 if (tid >= TID_MAX_LOAD_COUNT)
375 return 0;
376
377 tl = &(lq_data->load[tid]);
378
379 curr_time -= curr_time % TID_ROUND_VALUE;
380
381 if (!(tl->queue_count))
382 return 0;
383
384 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
385 index = time_diff / TID_QUEUE_CELL_SPACING;
386
387 /* The history is too long: remove data that is older than */
388 /* TID_MAX_TIME_DIFF */
389 if (index >= TID_QUEUE_MAX_SIZE)
390 rs_tl_rm_old_stats(tl, curr_time);
391
392 return tl->total;
393 }
394
395 static int rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
396 struct iwl_lq_sta *lq_data, u8 tid,
397 struct ieee80211_sta *sta)
398 {
399 int ret = -EAGAIN;
400 u32 load;
401
402 /*
403 * Don't create TX aggregation sessions when in high
404 * BT traffic, as they would just be disrupted by BT.
405 */
406 if (priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) {
407 IWL_ERR(priv, "BT traffic (%d), no aggregation allowed\n",
408 priv->bt_traffic_load);
409 return ret;
410 }
411
412 load = rs_tl_get_load(lq_data, tid);
413
414 if (load > IWL_AGG_LOAD_THRESHOLD) {
415 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
416 sta->addr, tid);
417 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
418 if (ret == -EAGAIN) {
419 /*
420 * driver and mac80211 is out of sync
421 * this might be cause by reloading firmware
422 * stop the tx ba session here
423 */
424 IWL_ERR(priv, "Fail start Tx agg on tid: %d\n",
425 tid);
426 ieee80211_stop_tx_ba_session(sta, tid);
427 }
428 } else {
429 IWL_ERR(priv, "Aggregation not enabled for tid %d "
430 "because load = %u\n", tid, load);
431 }
432 return ret;
433 }
434
435 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
436 struct iwl_lq_sta *lq_data,
437 struct ieee80211_sta *sta)
438 {
439 if (tid < TID_MAX_LOAD_COUNT)
440 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
441 else
442 IWL_ERR(priv, "tid exceeds max load count: %d/%d\n",
443 tid, TID_MAX_LOAD_COUNT);
444 }
445
446 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
447 {
448 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
449 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
450 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
451 }
452
453 /*
454 * Static function to get the expected throughput from an iwl_scale_tbl_info
455 * that wraps a NULL pointer check
456 */
457 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
458 {
459 if (tbl->expected_tpt)
460 return tbl->expected_tpt[rs_index];
461 return 0;
462 }
463
464 /**
465 * rs_collect_tx_data - Update the success/failure sliding window
466 *
467 * We keep a sliding window of the last 62 packets transmitted
468 * at this rate. window->data contains the bitmask of successful
469 * packets.
470 */
471 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
472 int scale_index, int attempts, int successes)
473 {
474 struct iwl_rate_scale_data *window = NULL;
475 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
476 s32 fail_count, tpt;
477
478 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
479 return -EINVAL;
480
481 /* Select window for current tx bit rate */
482 window = &(tbl->win[scale_index]);
483
484 /* Get expected throughput */
485 tpt = get_expected_tpt(tbl, scale_index);
486
487 /*
488 * Keep track of only the latest 62 tx frame attempts in this rate's
489 * history window; anything older isn't really relevant any more.
490 * If we have filled up the sliding window, drop the oldest attempt;
491 * if the oldest attempt (highest bit in bitmap) shows "success",
492 * subtract "1" from the success counter (this is the main reason
493 * we keep these bitmaps!).
494 */
495 while (attempts > 0) {
496 if (window->counter >= IWL_RATE_MAX_WINDOW) {
497
498 /* remove earliest */
499 window->counter = IWL_RATE_MAX_WINDOW - 1;
500
501 if (window->data & mask) {
502 window->data &= ~mask;
503 window->success_counter--;
504 }
505 }
506
507 /* Increment frames-attempted counter */
508 window->counter++;
509
510 /* Shift bitmap by one frame to throw away oldest history */
511 window->data <<= 1;
512
513 /* Mark the most recent #successes attempts as successful */
514 if (successes > 0) {
515 window->success_counter++;
516 window->data |= 0x1;
517 successes--;
518 }
519
520 attempts--;
521 }
522
523 /* Calculate current success ratio, avoid divide-by-0! */
524 if (window->counter > 0)
525 window->success_ratio = 128 * (100 * window->success_counter)
526 / window->counter;
527 else
528 window->success_ratio = IWL_INVALID_VALUE;
529
530 fail_count = window->counter - window->success_counter;
531
532 /* Calculate average throughput, if we have enough history. */
533 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
534 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
535 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
536 else
537 window->average_tpt = IWL_INVALID_VALUE;
538
539 /* Tag this window as having been updated */
540 window->stamp = jiffies;
541
542 return 0;
543 }
544
545 /*
546 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
547 */
548 /* FIXME:RS:remove this function and put the flags statically in the table */
549 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
550 struct iwl_scale_tbl_info *tbl,
551 int index, u8 use_green)
552 {
553 u32 rate_n_flags = 0;
554
555 if (is_legacy(tbl->lq_type)) {
556 rate_n_flags = iwl_rates[index].plcp;
557 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
558 rate_n_flags |= RATE_MCS_CCK_MSK;
559
560 } else if (is_Ht(tbl->lq_type)) {
561 if (index > IWL_LAST_OFDM_RATE) {
562 IWL_ERR(priv, "Invalid HT rate index %d\n", index);
563 index = IWL_LAST_OFDM_RATE;
564 }
565 rate_n_flags = RATE_MCS_HT_MSK;
566
567 if (is_siso(tbl->lq_type))
568 rate_n_flags |= iwl_rates[index].plcp_siso;
569 else if (is_mimo2(tbl->lq_type))
570 rate_n_flags |= iwl_rates[index].plcp_mimo2;
571 else
572 rate_n_flags |= iwl_rates[index].plcp_mimo3;
573 } else {
574 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
575 }
576
577 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
578 RATE_MCS_ANT_ABC_MSK);
579
580 if (is_Ht(tbl->lq_type)) {
581 if (tbl->is_ht40) {
582 if (tbl->is_dup)
583 rate_n_flags |= RATE_MCS_DUP_MSK;
584 else
585 rate_n_flags |= RATE_MCS_HT40_MSK;
586 }
587 if (tbl->is_SGI)
588 rate_n_flags |= RATE_MCS_SGI_MSK;
589
590 if (use_green) {
591 rate_n_flags |= RATE_MCS_GF_MSK;
592 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
593 rate_n_flags &= ~RATE_MCS_SGI_MSK;
594 IWL_ERR(priv, "GF was set with SGI:SISO\n");
595 }
596 }
597 }
598 return rate_n_flags;
599 }
600
601 /*
602 * Interpret uCode API's rate_n_flags format,
603 * fill "search" or "active" tx mode table.
604 */
605 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
606 enum ieee80211_band band,
607 struct iwl_scale_tbl_info *tbl,
608 int *rate_idx)
609 {
610 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
611 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
612 u8 mcs;
613
614 memset(tbl, 0, sizeof(struct iwl_scale_tbl_info));
615 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
616
617 if (*rate_idx == IWL_RATE_INVALID) {
618 *rate_idx = -1;
619 return -EINVAL;
620 }
621 tbl->is_SGI = 0; /* default legacy setup */
622 tbl->is_ht40 = 0;
623 tbl->is_dup = 0;
624 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
625 tbl->lq_type = LQ_NONE;
626 tbl->max_search = IWL_MAX_SEARCH;
627
628 /* legacy rate format */
629 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
630 if (num_of_ant == 1) {
631 if (band == IEEE80211_BAND_5GHZ)
632 tbl->lq_type = LQ_A;
633 else
634 tbl->lq_type = LQ_G;
635 }
636 /* HT rate format */
637 } else {
638 if (rate_n_flags & RATE_MCS_SGI_MSK)
639 tbl->is_SGI = 1;
640
641 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
642 (rate_n_flags & RATE_MCS_DUP_MSK))
643 tbl->is_ht40 = 1;
644
645 if (rate_n_flags & RATE_MCS_DUP_MSK)
646 tbl->is_dup = 1;
647
648 mcs = rs_extract_rate(rate_n_flags);
649
650 /* SISO */
651 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
652 if (num_of_ant == 1)
653 tbl->lq_type = LQ_SISO; /*else NONE*/
654 /* MIMO2 */
655 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
656 if (num_of_ant == 2)
657 tbl->lq_type = LQ_MIMO2;
658 /* MIMO3 */
659 } else {
660 if (num_of_ant == 3) {
661 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
662 tbl->lq_type = LQ_MIMO3;
663 }
664 }
665 }
666 return 0;
667 }
668
669 /* switch to another antenna/antennas and return 1 */
670 /* if no other valid antenna found, return 0 */
671 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
672 struct iwl_scale_tbl_info *tbl)
673 {
674 u8 new_ant_type;
675
676 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
677 return 0;
678
679 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
680 return 0;
681
682 new_ant_type = ant_toggle_lookup[tbl->ant_type];
683
684 while ((new_ant_type != tbl->ant_type) &&
685 !rs_is_valid_ant(valid_ant, new_ant_type))
686 new_ant_type = ant_toggle_lookup[new_ant_type];
687
688 if (new_ant_type == tbl->ant_type)
689 return 0;
690
691 tbl->ant_type = new_ant_type;
692 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
693 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
694 return 1;
695 }
696
697 /**
698 * Green-field mode is valid if the station supports it and
699 * there are no non-GF stations present in the BSS.
700 */
701 static bool rs_use_green(struct ieee80211_sta *sta)
702 {
703 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
704 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
705
706 return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
707 !(ctx->ht.non_gf_sta_present);
708 }
709
710 /**
711 * rs_get_supported_rates - get the available rates
712 *
713 * if management frame or broadcast frame only return
714 * basic available rates.
715 *
716 */
717 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
718 struct ieee80211_hdr *hdr,
719 enum iwl_table_type rate_type)
720 {
721 if (is_legacy(rate_type)) {
722 return lq_sta->active_legacy_rate;
723 } else {
724 if (is_siso(rate_type))
725 return lq_sta->active_siso_rate;
726 else if (is_mimo2(rate_type))
727 return lq_sta->active_mimo2_rate;
728 else
729 return lq_sta->active_mimo3_rate;
730 }
731 }
732
733 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
734 int rate_type)
735 {
736 u8 high = IWL_RATE_INVALID;
737 u8 low = IWL_RATE_INVALID;
738
739 /* 802.11A or ht walks to the next literal adjacent rate in
740 * the rate table */
741 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
742 int i;
743 u32 mask;
744
745 /* Find the previous rate that is in the rate mask */
746 i = index - 1;
747 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
748 if (rate_mask & mask) {
749 low = i;
750 break;
751 }
752 }
753
754 /* Find the next rate that is in the rate mask */
755 i = index + 1;
756 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
757 if (rate_mask & mask) {
758 high = i;
759 break;
760 }
761 }
762
763 return (high << 8) | low;
764 }
765
766 low = index;
767 while (low != IWL_RATE_INVALID) {
768 low = iwl_rates[low].prev_rs;
769 if (low == IWL_RATE_INVALID)
770 break;
771 if (rate_mask & (1 << low))
772 break;
773 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
774 }
775
776 high = index;
777 while (high != IWL_RATE_INVALID) {
778 high = iwl_rates[high].next_rs;
779 if (high == IWL_RATE_INVALID)
780 break;
781 if (rate_mask & (1 << high))
782 break;
783 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
784 }
785
786 return (high << 8) | low;
787 }
788
789 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
790 struct iwl_scale_tbl_info *tbl,
791 u8 scale_index, u8 ht_possible)
792 {
793 s32 low;
794 u16 rate_mask;
795 u16 high_low;
796 u8 switch_to_legacy = 0;
797 u8 is_green = lq_sta->is_green;
798 struct iwl_priv *priv = lq_sta->drv;
799
800 /* check if we need to switch from HT to legacy rates.
801 * assumption is that mandatory rates (1Mbps or 6Mbps)
802 * are always supported (spec demand) */
803 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
804 switch_to_legacy = 1;
805 scale_index = rs_ht_to_legacy[scale_index];
806 if (lq_sta->band == IEEE80211_BAND_5GHZ)
807 tbl->lq_type = LQ_A;
808 else
809 tbl->lq_type = LQ_G;
810
811 if (num_of_ant(tbl->ant_type) > 1)
812 tbl->ant_type =
813 first_antenna(priv->hw_params.valid_tx_ant);
814
815 tbl->is_ht40 = 0;
816 tbl->is_SGI = 0;
817 tbl->max_search = IWL_MAX_SEARCH;
818 }
819
820 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
821
822 /* Mask with station rate restriction */
823 if (is_legacy(tbl->lq_type)) {
824 /* supp_rates has no CCK bits in A mode */
825 if (lq_sta->band == IEEE80211_BAND_5GHZ)
826 rate_mask = (u16)(rate_mask &
827 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
828 else
829 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
830 }
831
832 /* If we switched from HT to legacy, check current rate */
833 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
834 low = scale_index;
835 goto out;
836 }
837
838 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
839 tbl->lq_type);
840 low = high_low & 0xff;
841
842 if (low == IWL_RATE_INVALID)
843 low = scale_index;
844
845 out:
846 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
847 }
848
849 /*
850 * Simple function to compare two rate scale table types
851 */
852 static bool table_type_matches(struct iwl_scale_tbl_info *a,
853 struct iwl_scale_tbl_info *b)
854 {
855 return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
856 (a->is_SGI == b->is_SGI);
857 }
858
859 static void rs_bt_update_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
860 struct iwl_lq_sta *lq_sta)
861 {
862 struct iwl_scale_tbl_info *tbl;
863 bool full_concurrent = priv->bt_full_concurrent;
864 unsigned long flags;
865
866 if (priv->bt_ant_couple_ok) {
867 /*
868 * Is there a need to switch between
869 * full concurrency and 3-wire?
870 */
871 spin_lock_irqsave(&priv->lock, flags);
872 if (priv->bt_ci_compliance && priv->bt_ant_couple_ok)
873 full_concurrent = true;
874 else
875 full_concurrent = false;
876 spin_unlock_irqrestore(&priv->lock, flags);
877 }
878 if ((priv->bt_traffic_load != priv->last_bt_traffic_load) ||
879 (priv->bt_full_concurrent != full_concurrent)) {
880 priv->bt_full_concurrent = full_concurrent;
881 priv->last_bt_traffic_load = priv->bt_traffic_load;
882
883 /* Update uCode's rate table. */
884 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
885 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
886 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
887
888 queue_work(priv->workqueue, &priv->bt_full_concurrency);
889 }
890 }
891
892 /*
893 * mac80211 sends us Tx status
894 */
895 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
896 struct ieee80211_sta *sta, void *priv_sta,
897 struct sk_buff *skb)
898 {
899 int legacy_success;
900 int retries;
901 int rs_index, mac_index, i;
902 struct iwl_lq_sta *lq_sta = priv_sta;
903 struct iwl_link_quality_cmd *table;
904 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
905 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
906 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
907 enum mac80211_rate_control_flags mac_flags;
908 u32 tx_rate;
909 struct iwl_scale_tbl_info tbl_type;
910 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
911 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
912 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
913
914 IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
915
916 /* Treat uninitialized rate scaling data same as non-existing. */
917 if (!lq_sta) {
918 IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n");
919 return;
920 } else if (!lq_sta->drv) {
921 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
922 return;
923 }
924
925 if (!ieee80211_is_data(hdr->frame_control) ||
926 info->flags & IEEE80211_TX_CTL_NO_ACK)
927 return;
928
929 /* This packet was aggregated but doesn't carry status info */
930 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
931 !(info->flags & IEEE80211_TX_STAT_AMPDU))
932 return;
933
934 /*
935 * Ignore this Tx frame response if its initial rate doesn't match
936 * that of latest Link Quality command. There may be stragglers
937 * from a previous Link Quality command, but we're no longer interested
938 * in those; they're either from the "active" mode while we're trying
939 * to check "search" mode, or a prior "search" mode after we've moved
940 * to a new "search" mode (which might become the new "active" mode).
941 */
942 table = &lq_sta->lq;
943 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
944 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
945 if (priv->band == IEEE80211_BAND_5GHZ)
946 rs_index -= IWL_FIRST_OFDM_RATE;
947 mac_flags = info->status.rates[0].flags;
948 mac_index = info->status.rates[0].idx;
949 /* For HT packets, map MCS to PLCP */
950 if (mac_flags & IEEE80211_TX_RC_MCS) {
951 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
952 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
953 mac_index++;
954 /*
955 * mac80211 HT index is always zero-indexed; we need to move
956 * HT OFDM rates after CCK rates in 2.4 GHz band
957 */
958 if (priv->band == IEEE80211_BAND_2GHZ)
959 mac_index += IWL_FIRST_OFDM_RATE;
960 }
961 /* Here we actually compare this rate to the latest LQ command */
962 if ((mac_index < 0) ||
963 (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
964 (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
965 (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
966 (tbl_type.ant_type != info->antenna_sel_tx) ||
967 (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
968 (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
969 (rs_index != mac_index)) {
970 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate);
971 /*
972 * Since rates mis-match, the last LQ command may have failed.
973 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
974 * ... driver.
975 */
976 lq_sta->missed_rate_counter++;
977 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
978 lq_sta->missed_rate_counter = 0;
979 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
980 }
981 /* Regardless, ignore this status info for outdated rate */
982 return;
983 } else
984 /* Rate did match, so reset the missed_rate_counter */
985 lq_sta->missed_rate_counter = 0;
986
987 /* Figure out if rate scale algorithm is in active or search table */
988 if (table_type_matches(&tbl_type,
989 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
990 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
991 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
992 } else if (table_type_matches(&tbl_type,
993 &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
994 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
995 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
996 } else {
997 IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n");
998 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
999 IWL_DEBUG_RATE(priv, "active- lq:%x, ant:%x, SGI:%d\n",
1000 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
1001 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1002 IWL_DEBUG_RATE(priv, "search- lq:%x, ant:%x, SGI:%d\n",
1003 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
1004 IWL_DEBUG_RATE(priv, "actual- lq:%x, ant:%x, SGI:%d\n",
1005 tbl_type.lq_type, tbl_type.ant_type, tbl_type.is_SGI);
1006 /*
1007 * no matching table found, let's by-pass the data collection
1008 * and continue to perform rate scale to find the rate table
1009 */
1010 rs_stay_in_table(lq_sta, true);
1011 goto done;
1012 }
1013
1014 /*
1015 * Updating the frame history depends on whether packets were
1016 * aggregated.
1017 *
1018 * For aggregation, all packets were transmitted at the same rate, the
1019 * first index into rate scale table.
1020 */
1021 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1022 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
1023 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
1024 &rs_index);
1025 rs_collect_tx_data(curr_tbl, rs_index,
1026 info->status.ampdu_len,
1027 info->status.ampdu_ack_len);
1028
1029 /* Update success/fail counts if not searching for new mode */
1030 if (lq_sta->stay_in_tbl) {
1031 lq_sta->total_success += info->status.ampdu_ack_len;
1032 lq_sta->total_failed += (info->status.ampdu_len -
1033 info->status.ampdu_ack_len);
1034 }
1035 } else {
1036 /*
1037 * For legacy, update frame history with for each Tx retry.
1038 */
1039 retries = info->status.rates[0].count - 1;
1040 /* HW doesn't send more than 15 retries */
1041 retries = min(retries, 15);
1042
1043 /* The last transmission may have been successful */
1044 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1045 /* Collect data for each rate used during failed TX attempts */
1046 for (i = 0; i <= retries; ++i) {
1047 tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
1048 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
1049 &tbl_type, &rs_index);
1050 /*
1051 * Only collect stats if retried rate is in the same RS
1052 * table as active/search.
1053 */
1054 if (table_type_matches(&tbl_type, curr_tbl))
1055 tmp_tbl = curr_tbl;
1056 else if (table_type_matches(&tbl_type, other_tbl))
1057 tmp_tbl = other_tbl;
1058 else
1059 continue;
1060 rs_collect_tx_data(tmp_tbl, rs_index, 1,
1061 i < retries ? 0 : legacy_success);
1062 }
1063
1064 /* Update success/fail counts if not searching for new mode */
1065 if (lq_sta->stay_in_tbl) {
1066 lq_sta->total_success += legacy_success;
1067 lq_sta->total_failed += retries + (1 - legacy_success);
1068 }
1069 }
1070 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1071 lq_sta->last_rate_n_flags = tx_rate;
1072 done:
1073 /* See if there's a better rate or modulation mode to try. */
1074 if (sta && sta->supp_rates[sband->band])
1075 rs_rate_scale_perform(priv, skb, sta, lq_sta);
1076 #ifdef CONFIG_MAC80211_DEBUGFS
1077 if (priv->dbg_fixed_rate != lq_sta->dbg_fixed_rate)
1078 rs_program_fix_rate(priv, lq_sta);
1079 #endif
1080 if (priv->cfg->bt_params && priv->cfg->bt_params->advanced_bt_coexist)
1081 rs_bt_update_lq(priv, ctx, lq_sta);
1082 }
1083
1084 /*
1085 * Begin a period of staying with a selected modulation mode.
1086 * Set "stay_in_tbl" flag to prevent any mode switches.
1087 * Set frame tx success limits according to legacy vs. high-throughput,
1088 * and reset overall (spanning all rates) tx success history statistics.
1089 * These control how long we stay using same modulation mode before
1090 * searching for a new mode.
1091 */
1092 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
1093 struct iwl_lq_sta *lq_sta)
1094 {
1095 IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
1096 lq_sta->stay_in_tbl = 1; /* only place this gets set */
1097 if (is_legacy) {
1098 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1099 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1100 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1101 } else {
1102 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1103 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1104 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1105 }
1106 lq_sta->table_count = 0;
1107 lq_sta->total_failed = 0;
1108 lq_sta->total_success = 0;
1109 lq_sta->flush_timer = jiffies;
1110 lq_sta->action_counter = 0;
1111 }
1112
1113 /*
1114 * Find correct throughput table for given mode of modulation
1115 */
1116 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1117 struct iwl_scale_tbl_info *tbl)
1118 {
1119 /* Used to choose among HT tables */
1120 s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1121
1122 /* Check for invalid LQ type */
1123 if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1124 tbl->expected_tpt = expected_tpt_legacy;
1125 return;
1126 }
1127
1128 /* Legacy rates have only one table */
1129 if (is_legacy(tbl->lq_type)) {
1130 tbl->expected_tpt = expected_tpt_legacy;
1131 return;
1132 }
1133
1134 /* Choose among many HT tables depending on number of streams
1135 * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
1136 * status */
1137 if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1138 ht_tbl_pointer = expected_tpt_siso20MHz;
1139 else if (is_siso(tbl->lq_type))
1140 ht_tbl_pointer = expected_tpt_siso40MHz;
1141 else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1142 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1143 else if (is_mimo2(tbl->lq_type))
1144 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1145 else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1146 ht_tbl_pointer = expected_tpt_mimo3_20MHz;
1147 else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
1148 ht_tbl_pointer = expected_tpt_mimo3_40MHz;
1149
1150 if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */
1151 tbl->expected_tpt = ht_tbl_pointer[0];
1152 else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */
1153 tbl->expected_tpt = ht_tbl_pointer[1];
1154 else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */
1155 tbl->expected_tpt = ht_tbl_pointer[2];
1156 else /* AGG+SGI */
1157 tbl->expected_tpt = ht_tbl_pointer[3];
1158 }
1159
1160 /*
1161 * Find starting rate for new "search" high-throughput mode of modulation.
1162 * Goal is to find lowest expected rate (under perfect conditions) that is
1163 * above the current measured throughput of "active" mode, to give new mode
1164 * a fair chance to prove itself without too many challenges.
1165 *
1166 * This gets called when transitioning to more aggressive modulation
1167 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1168 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1169 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1170 * bit rate will typically need to increase, but not if performance was bad.
1171 */
1172 static s32 rs_get_best_rate(struct iwl_priv *priv,
1173 struct iwl_lq_sta *lq_sta,
1174 struct iwl_scale_tbl_info *tbl, /* "search" */
1175 u16 rate_mask, s8 index)
1176 {
1177 /* "active" values */
1178 struct iwl_scale_tbl_info *active_tbl =
1179 &(lq_sta->lq_info[lq_sta->active_tbl]);
1180 s32 active_sr = active_tbl->win[index].success_ratio;
1181 s32 active_tpt = active_tbl->expected_tpt[index];
1182
1183 /* expected "search" throughput */
1184 s32 *tpt_tbl = tbl->expected_tpt;
1185
1186 s32 new_rate, high, low, start_hi;
1187 u16 high_low;
1188 s8 rate = index;
1189
1190 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1191
1192 for (; ;) {
1193 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1194 tbl->lq_type);
1195
1196 low = high_low & 0xff;
1197 high = (high_low >> 8) & 0xff;
1198
1199 /*
1200 * Lower the "search" bit rate, to give new "search" mode
1201 * approximately the same throughput as "active" if:
1202 *
1203 * 1) "Active" mode has been working modestly well (but not
1204 * great), and expected "search" throughput (under perfect
1205 * conditions) at candidate rate is above the actual
1206 * measured "active" throughput (but less than expected
1207 * "active" throughput under perfect conditions).
1208 * OR
1209 * 2) "Active" mode has been working perfectly or very well
1210 * and expected "search" throughput (under perfect
1211 * conditions) at candidate rate is above expected
1212 * "active" throughput (under perfect conditions).
1213 */
1214 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1215 ((active_sr > IWL_RATE_DECREASE_TH) &&
1216 (active_sr <= IWL_RATE_HIGH_TH) &&
1217 (tpt_tbl[rate] <= active_tpt))) ||
1218 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1219 (tpt_tbl[rate] > active_tpt))) {
1220
1221 /* (2nd or later pass)
1222 * If we've already tried to raise the rate, and are
1223 * now trying to lower it, use the higher rate. */
1224 if (start_hi != IWL_RATE_INVALID) {
1225 new_rate = start_hi;
1226 break;
1227 }
1228
1229 new_rate = rate;
1230
1231 /* Loop again with lower rate */
1232 if (low != IWL_RATE_INVALID)
1233 rate = low;
1234
1235 /* Lower rate not available, use the original */
1236 else
1237 break;
1238
1239 /* Else try to raise the "search" rate to match "active" */
1240 } else {
1241 /* (2nd or later pass)
1242 * If we've already tried to lower the rate, and are
1243 * now trying to raise it, use the lower rate. */
1244 if (new_rate != IWL_RATE_INVALID)
1245 break;
1246
1247 /* Loop again with higher rate */
1248 else if (high != IWL_RATE_INVALID) {
1249 start_hi = high;
1250 rate = high;
1251
1252 /* Higher rate not available, use the original */
1253 } else {
1254 new_rate = rate;
1255 break;
1256 }
1257 }
1258 }
1259
1260 return new_rate;
1261 }
1262
1263 /*
1264 * Set up search table for MIMO2
1265 */
1266 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1267 struct iwl_lq_sta *lq_sta,
1268 struct ieee80211_conf *conf,
1269 struct ieee80211_sta *sta,
1270 struct iwl_scale_tbl_info *tbl, int index)
1271 {
1272 u16 rate_mask;
1273 s32 rate;
1274 s8 is_green = lq_sta->is_green;
1275 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1276 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1277
1278 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1279 return -1;
1280
1281 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1282 == WLAN_HT_CAP_SM_PS_STATIC)
1283 return -1;
1284
1285 /* Need both Tx chains/antennas to support MIMO */
1286 if (priv->hw_params.tx_chains_num < 2)
1287 return -1;
1288
1289 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1290
1291 tbl->lq_type = LQ_MIMO2;
1292 tbl->is_dup = lq_sta->is_dup;
1293 tbl->action = 0;
1294 tbl->max_search = IWL_MAX_SEARCH;
1295 rate_mask = lq_sta->active_mimo2_rate;
1296
1297 if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1298 tbl->is_ht40 = 1;
1299 else
1300 tbl->is_ht40 = 0;
1301
1302 rs_set_expected_tpt_table(lq_sta, tbl);
1303
1304 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1305
1306 IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1307 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1308 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1309 rate, rate_mask);
1310 return -1;
1311 }
1312 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1313
1314 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1315 tbl->current_rate, is_green);
1316 return 0;
1317 }
1318
1319 /*
1320 * Set up search table for MIMO3
1321 */
1322 static int rs_switch_to_mimo3(struct iwl_priv *priv,
1323 struct iwl_lq_sta *lq_sta,
1324 struct ieee80211_conf *conf,
1325 struct ieee80211_sta *sta,
1326 struct iwl_scale_tbl_info *tbl, int index)
1327 {
1328 u16 rate_mask;
1329 s32 rate;
1330 s8 is_green = lq_sta->is_green;
1331 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1332 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1333
1334 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1335 return -1;
1336
1337 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1338 == WLAN_HT_CAP_SM_PS_STATIC)
1339 return -1;
1340
1341 /* Need both Tx chains/antennas to support MIMO */
1342 if (priv->hw_params.tx_chains_num < 3)
1343 return -1;
1344
1345 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1346
1347 tbl->lq_type = LQ_MIMO3;
1348 tbl->is_dup = lq_sta->is_dup;
1349 tbl->action = 0;
1350 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1351 rate_mask = lq_sta->active_mimo3_rate;
1352
1353 if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1354 tbl->is_ht40 = 1;
1355 else
1356 tbl->is_ht40 = 0;
1357
1358 rs_set_expected_tpt_table(lq_sta, tbl);
1359
1360 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1361
1362 IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1363 rate, rate_mask);
1364 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1365 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1366 rate, rate_mask);
1367 return -1;
1368 }
1369 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1370
1371 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1372 tbl->current_rate, is_green);
1373 return 0;
1374 }
1375
1376 /*
1377 * Set up search table for SISO
1378 */
1379 static int rs_switch_to_siso(struct iwl_priv *priv,
1380 struct iwl_lq_sta *lq_sta,
1381 struct ieee80211_conf *conf,
1382 struct ieee80211_sta *sta,
1383 struct iwl_scale_tbl_info *tbl, int index)
1384 {
1385 u16 rate_mask;
1386 u8 is_green = lq_sta->is_green;
1387 s32 rate;
1388 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1389 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1390
1391 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1392 return -1;
1393
1394 IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1395
1396 tbl->is_dup = lq_sta->is_dup;
1397 tbl->lq_type = LQ_SISO;
1398 tbl->action = 0;
1399 tbl->max_search = IWL_MAX_SEARCH;
1400 rate_mask = lq_sta->active_siso_rate;
1401
1402 if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1403 tbl->is_ht40 = 1;
1404 else
1405 tbl->is_ht40 = 0;
1406
1407 if (is_green)
1408 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1409
1410 rs_set_expected_tpt_table(lq_sta, tbl);
1411 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1412
1413 IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1414 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1415 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1416 rate, rate_mask);
1417 return -1;
1418 }
1419 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1420 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1421 tbl->current_rate, is_green);
1422 return 0;
1423 }
1424
1425 /*
1426 * Try to switch to new modulation mode from legacy
1427 */
1428 static int rs_move_legacy_other(struct iwl_priv *priv,
1429 struct iwl_lq_sta *lq_sta,
1430 struct ieee80211_conf *conf,
1431 struct ieee80211_sta *sta,
1432 int index)
1433 {
1434 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1435 struct iwl_scale_tbl_info *search_tbl =
1436 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1437 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1438 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1439 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1440 u8 start_action;
1441 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1442 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1443 int ret = 0;
1444 u8 update_search_tbl_counter = 0;
1445
1446 switch (priv->bt_traffic_load) {
1447 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1448 /* nothing */
1449 break;
1450 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1451 /* avoid antenna B unless MIMO */
1452 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1453 if (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2)
1454 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1455 break;
1456 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1457 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1458 /* avoid antenna B and MIMO */
1459 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1460 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2 &&
1461 tbl->action != IWL_LEGACY_SWITCH_SISO)
1462 tbl->action = IWL_LEGACY_SWITCH_SISO;
1463 break;
1464 default:
1465 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1466 break;
1467 }
1468
1469 if (!iwl_ht_enabled(priv))
1470 /* stay in Legacy */
1471 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1472 else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1473 tbl->action > IWL_LEGACY_SWITCH_SISO)
1474 tbl->action = IWL_LEGACY_SWITCH_SISO;
1475
1476 /* configure as 1x1 if bt full concurrency */
1477 if (priv->bt_full_concurrent) {
1478 if (!iwl_ht_enabled(priv))
1479 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1480 else if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1481 tbl->action = IWL_LEGACY_SWITCH_SISO;
1482 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1483 }
1484
1485 start_action = tbl->action;
1486 for (; ;) {
1487 lq_sta->action_counter++;
1488 switch (tbl->action) {
1489 case IWL_LEGACY_SWITCH_ANTENNA1:
1490 case IWL_LEGACY_SWITCH_ANTENNA2:
1491 IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1492
1493 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1494 tx_chains_num <= 1) ||
1495 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1496 tx_chains_num <= 2))
1497 break;
1498
1499 /* Don't change antenna if success has been great */
1500 if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1501 !priv->bt_full_concurrent &&
1502 priv->bt_traffic_load ==
1503 IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1504 break;
1505
1506 /* Set up search table to try other antenna */
1507 memcpy(search_tbl, tbl, sz);
1508
1509 if (rs_toggle_antenna(valid_tx_ant,
1510 &search_tbl->current_rate, search_tbl)) {
1511 update_search_tbl_counter = 1;
1512 rs_set_expected_tpt_table(lq_sta, search_tbl);
1513 goto out;
1514 }
1515 break;
1516 case IWL_LEGACY_SWITCH_SISO:
1517 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1518
1519 /* Set up search table to try SISO */
1520 memcpy(search_tbl, tbl, sz);
1521 search_tbl->is_SGI = 0;
1522 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1523 search_tbl, index);
1524 if (!ret) {
1525 lq_sta->action_counter = 0;
1526 goto out;
1527 }
1528
1529 break;
1530 case IWL_LEGACY_SWITCH_MIMO2_AB:
1531 case IWL_LEGACY_SWITCH_MIMO2_AC:
1532 case IWL_LEGACY_SWITCH_MIMO2_BC:
1533 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1534
1535 /* Set up search table to try MIMO */
1536 memcpy(search_tbl, tbl, sz);
1537 search_tbl->is_SGI = 0;
1538
1539 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1540 search_tbl->ant_type = ANT_AB;
1541 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1542 search_tbl->ant_type = ANT_AC;
1543 else
1544 search_tbl->ant_type = ANT_BC;
1545
1546 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1547 break;
1548
1549 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1550 search_tbl, index);
1551 if (!ret) {
1552 lq_sta->action_counter = 0;
1553 goto out;
1554 }
1555 break;
1556
1557 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1558 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1559
1560 /* Set up search table to try MIMO3 */
1561 memcpy(search_tbl, tbl, sz);
1562 search_tbl->is_SGI = 0;
1563
1564 search_tbl->ant_type = ANT_ABC;
1565
1566 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1567 break;
1568
1569 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1570 search_tbl, index);
1571 if (!ret) {
1572 lq_sta->action_counter = 0;
1573 goto out;
1574 }
1575 break;
1576 }
1577 tbl->action++;
1578 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1579 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1580
1581 if (tbl->action == start_action)
1582 break;
1583
1584 }
1585 search_tbl->lq_type = LQ_NONE;
1586 return 0;
1587
1588 out:
1589 lq_sta->search_better_tbl = 1;
1590 tbl->action++;
1591 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1592 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1593 if (update_search_tbl_counter)
1594 search_tbl->action = tbl->action;
1595 return 0;
1596
1597 }
1598
1599 /*
1600 * Try to switch to new modulation mode from SISO
1601 */
1602 static int rs_move_siso_to_other(struct iwl_priv *priv,
1603 struct iwl_lq_sta *lq_sta,
1604 struct ieee80211_conf *conf,
1605 struct ieee80211_sta *sta, int index)
1606 {
1607 u8 is_green = lq_sta->is_green;
1608 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1609 struct iwl_scale_tbl_info *search_tbl =
1610 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1611 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1612 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1613 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1614 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1615 u8 start_action;
1616 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1617 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1618 u8 update_search_tbl_counter = 0;
1619 int ret;
1620
1621 switch (priv->bt_traffic_load) {
1622 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1623 /* nothing */
1624 break;
1625 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1626 /* avoid antenna B unless MIMO */
1627 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1628 if (tbl->action == IWL_SISO_SWITCH_ANTENNA2)
1629 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1630 break;
1631 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1632 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1633 /* avoid antenna B and MIMO */
1634 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1635 if (tbl->action != IWL_SISO_SWITCH_ANTENNA1)
1636 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1637 break;
1638 default:
1639 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1640 break;
1641 }
1642
1643 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1644 tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1645 /* stay in SISO */
1646 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1647 }
1648
1649 /* configure as 1x1 if bt full concurrency */
1650 if (priv->bt_full_concurrent) {
1651 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1652 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1653 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1654 }
1655
1656 start_action = tbl->action;
1657 for (;;) {
1658 lq_sta->action_counter++;
1659 switch (tbl->action) {
1660 case IWL_SISO_SWITCH_ANTENNA1:
1661 case IWL_SISO_SWITCH_ANTENNA2:
1662 IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1663 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1664 tx_chains_num <= 1) ||
1665 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1666 tx_chains_num <= 2))
1667 break;
1668
1669 if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1670 !priv->bt_full_concurrent &&
1671 priv->bt_traffic_load ==
1672 IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1673 break;
1674
1675 memcpy(search_tbl, tbl, sz);
1676 if (rs_toggle_antenna(valid_tx_ant,
1677 &search_tbl->current_rate, search_tbl)) {
1678 update_search_tbl_counter = 1;
1679 goto out;
1680 }
1681 break;
1682 case IWL_SISO_SWITCH_MIMO2_AB:
1683 case IWL_SISO_SWITCH_MIMO2_AC:
1684 case IWL_SISO_SWITCH_MIMO2_BC:
1685 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1686 memcpy(search_tbl, tbl, sz);
1687 search_tbl->is_SGI = 0;
1688
1689 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1690 search_tbl->ant_type = ANT_AB;
1691 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1692 search_tbl->ant_type = ANT_AC;
1693 else
1694 search_tbl->ant_type = ANT_BC;
1695
1696 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1697 break;
1698
1699 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1700 search_tbl, index);
1701 if (!ret)
1702 goto out;
1703 break;
1704 case IWL_SISO_SWITCH_GI:
1705 if (!tbl->is_ht40 && !(ht_cap->cap &
1706 IEEE80211_HT_CAP_SGI_20))
1707 break;
1708 if (tbl->is_ht40 && !(ht_cap->cap &
1709 IEEE80211_HT_CAP_SGI_40))
1710 break;
1711
1712 IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1713
1714 memcpy(search_tbl, tbl, sz);
1715 if (is_green) {
1716 if (!tbl->is_SGI)
1717 break;
1718 else
1719 IWL_ERR(priv,
1720 "SGI was set in GF+SISO\n");
1721 }
1722 search_tbl->is_SGI = !tbl->is_SGI;
1723 rs_set_expected_tpt_table(lq_sta, search_tbl);
1724 if (tbl->is_SGI) {
1725 s32 tpt = lq_sta->last_tpt / 100;
1726 if (tpt >= search_tbl->expected_tpt[index])
1727 break;
1728 }
1729 search_tbl->current_rate =
1730 rate_n_flags_from_tbl(priv, search_tbl,
1731 index, is_green);
1732 update_search_tbl_counter = 1;
1733 goto out;
1734 case IWL_SISO_SWITCH_MIMO3_ABC:
1735 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1736 memcpy(search_tbl, tbl, sz);
1737 search_tbl->is_SGI = 0;
1738 search_tbl->ant_type = ANT_ABC;
1739
1740 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1741 break;
1742
1743 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1744 search_tbl, index);
1745 if (!ret)
1746 goto out;
1747 break;
1748 }
1749 tbl->action++;
1750 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1751 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1752
1753 if (tbl->action == start_action)
1754 break;
1755 }
1756 search_tbl->lq_type = LQ_NONE;
1757 return 0;
1758
1759 out:
1760 lq_sta->search_better_tbl = 1;
1761 tbl->action++;
1762 if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1763 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1764 if (update_search_tbl_counter)
1765 search_tbl->action = tbl->action;
1766
1767 return 0;
1768 }
1769
1770 /*
1771 * Try to switch to new modulation mode from MIMO2
1772 */
1773 static int rs_move_mimo2_to_other(struct iwl_priv *priv,
1774 struct iwl_lq_sta *lq_sta,
1775 struct ieee80211_conf *conf,
1776 struct ieee80211_sta *sta, int index)
1777 {
1778 s8 is_green = lq_sta->is_green;
1779 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1780 struct iwl_scale_tbl_info *search_tbl =
1781 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1782 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1783 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1784 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1785 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1786 u8 start_action;
1787 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1788 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1789 u8 update_search_tbl_counter = 0;
1790 int ret;
1791
1792 switch (priv->bt_traffic_load) {
1793 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1794 /* nothing */
1795 break;
1796 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1797 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1798 /* avoid antenna B and MIMO */
1799 if (tbl->action != IWL_MIMO2_SWITCH_SISO_A)
1800 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1801 break;
1802 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1803 /* avoid antenna B unless MIMO */
1804 if (tbl->action == IWL_MIMO2_SWITCH_SISO_B ||
1805 tbl->action == IWL_MIMO2_SWITCH_SISO_C)
1806 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1807 break;
1808 default:
1809 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1810 break;
1811 }
1812
1813 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1814 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1815 tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1816 /* switch in SISO */
1817 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1818 }
1819
1820 /* configure as 1x1 if bt full concurrency */
1821 if (priv->bt_full_concurrent &&
1822 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1823 tbl->action > IWL_MIMO2_SWITCH_SISO_C))
1824 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1825
1826 start_action = tbl->action;
1827 for (;;) {
1828 lq_sta->action_counter++;
1829 switch (tbl->action) {
1830 case IWL_MIMO2_SWITCH_ANTENNA1:
1831 case IWL_MIMO2_SWITCH_ANTENNA2:
1832 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1833
1834 if (tx_chains_num <= 2)
1835 break;
1836
1837 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1838 break;
1839
1840 memcpy(search_tbl, tbl, sz);
1841 if (rs_toggle_antenna(valid_tx_ant,
1842 &search_tbl->current_rate, search_tbl)) {
1843 update_search_tbl_counter = 1;
1844 goto out;
1845 }
1846 break;
1847 case IWL_MIMO2_SWITCH_SISO_A:
1848 case IWL_MIMO2_SWITCH_SISO_B:
1849 case IWL_MIMO2_SWITCH_SISO_C:
1850 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1851
1852 /* Set up new search table for SISO */
1853 memcpy(search_tbl, tbl, sz);
1854
1855 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1856 search_tbl->ant_type = ANT_A;
1857 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1858 search_tbl->ant_type = ANT_B;
1859 else
1860 search_tbl->ant_type = ANT_C;
1861
1862 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1863 break;
1864
1865 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1866 search_tbl, index);
1867 if (!ret)
1868 goto out;
1869
1870 break;
1871
1872 case IWL_MIMO2_SWITCH_GI:
1873 if (!tbl->is_ht40 && !(ht_cap->cap &
1874 IEEE80211_HT_CAP_SGI_20))
1875 break;
1876 if (tbl->is_ht40 && !(ht_cap->cap &
1877 IEEE80211_HT_CAP_SGI_40))
1878 break;
1879
1880 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1881
1882 /* Set up new search table for MIMO2 */
1883 memcpy(search_tbl, tbl, sz);
1884 search_tbl->is_SGI = !tbl->is_SGI;
1885 rs_set_expected_tpt_table(lq_sta, search_tbl);
1886 /*
1887 * If active table already uses the fastest possible
1888 * modulation (dual stream with short guard interval),
1889 * and it's working well, there's no need to look
1890 * for a better type of modulation!
1891 */
1892 if (tbl->is_SGI) {
1893 s32 tpt = lq_sta->last_tpt / 100;
1894 if (tpt >= search_tbl->expected_tpt[index])
1895 break;
1896 }
1897 search_tbl->current_rate =
1898 rate_n_flags_from_tbl(priv, search_tbl,
1899 index, is_green);
1900 update_search_tbl_counter = 1;
1901 goto out;
1902
1903 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1904 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1905 memcpy(search_tbl, tbl, sz);
1906 search_tbl->is_SGI = 0;
1907 search_tbl->ant_type = ANT_ABC;
1908
1909 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1910 break;
1911
1912 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1913 search_tbl, index);
1914 if (!ret)
1915 goto out;
1916
1917 break;
1918 }
1919 tbl->action++;
1920 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1921 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1922
1923 if (tbl->action == start_action)
1924 break;
1925 }
1926 search_tbl->lq_type = LQ_NONE;
1927 return 0;
1928 out:
1929 lq_sta->search_better_tbl = 1;
1930 tbl->action++;
1931 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1932 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1933 if (update_search_tbl_counter)
1934 search_tbl->action = tbl->action;
1935
1936 return 0;
1937
1938 }
1939
1940 /*
1941 * Try to switch to new modulation mode from MIMO3
1942 */
1943 static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1944 struct iwl_lq_sta *lq_sta,
1945 struct ieee80211_conf *conf,
1946 struct ieee80211_sta *sta, int index)
1947 {
1948 s8 is_green = lq_sta->is_green;
1949 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1950 struct iwl_scale_tbl_info *search_tbl =
1951 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1952 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1953 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1954 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1955 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1956 u8 start_action;
1957 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1958 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1959 int ret;
1960 u8 update_search_tbl_counter = 0;
1961
1962 switch (priv->bt_traffic_load) {
1963 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1964 /* nothing */
1965 break;
1966 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1967 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1968 /* avoid antenna B and MIMO */
1969 if (tbl->action != IWL_MIMO3_SWITCH_SISO_A)
1970 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1971 break;
1972 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1973 /* avoid antenna B unless MIMO */
1974 if (tbl->action == IWL_MIMO3_SWITCH_SISO_B ||
1975 tbl->action == IWL_MIMO3_SWITCH_SISO_C)
1976 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1977 break;
1978 default:
1979 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1980 break;
1981 }
1982
1983 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1984 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1985 tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1986 /* switch in SISO */
1987 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1988 }
1989
1990 /* configure as 1x1 if bt full concurrency */
1991 if (priv->bt_full_concurrent &&
1992 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1993 tbl->action > IWL_MIMO3_SWITCH_SISO_C))
1994 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1995
1996 start_action = tbl->action;
1997 for (;;) {
1998 lq_sta->action_counter++;
1999 switch (tbl->action) {
2000 case IWL_MIMO3_SWITCH_ANTENNA1:
2001 case IWL_MIMO3_SWITCH_ANTENNA2:
2002 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
2003
2004 if (tx_chains_num <= 3)
2005 break;
2006
2007 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
2008 break;
2009
2010 memcpy(search_tbl, tbl, sz);
2011 if (rs_toggle_antenna(valid_tx_ant,
2012 &search_tbl->current_rate, search_tbl))
2013 goto out;
2014 break;
2015 case IWL_MIMO3_SWITCH_SISO_A:
2016 case IWL_MIMO3_SWITCH_SISO_B:
2017 case IWL_MIMO3_SWITCH_SISO_C:
2018 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
2019
2020 /* Set up new search table for SISO */
2021 memcpy(search_tbl, tbl, sz);
2022
2023 if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
2024 search_tbl->ant_type = ANT_A;
2025 else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
2026 search_tbl->ant_type = ANT_B;
2027 else
2028 search_tbl->ant_type = ANT_C;
2029
2030 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2031 break;
2032
2033 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
2034 search_tbl, index);
2035 if (!ret)
2036 goto out;
2037
2038 break;
2039
2040 case IWL_MIMO3_SWITCH_MIMO2_AB:
2041 case IWL_MIMO3_SWITCH_MIMO2_AC:
2042 case IWL_MIMO3_SWITCH_MIMO2_BC:
2043 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
2044
2045 memcpy(search_tbl, tbl, sz);
2046 search_tbl->is_SGI = 0;
2047 if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
2048 search_tbl->ant_type = ANT_AB;
2049 else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
2050 search_tbl->ant_type = ANT_AC;
2051 else
2052 search_tbl->ant_type = ANT_BC;
2053
2054 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2055 break;
2056
2057 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
2058 search_tbl, index);
2059 if (!ret)
2060 goto out;
2061
2062 break;
2063
2064 case IWL_MIMO3_SWITCH_GI:
2065 if (!tbl->is_ht40 && !(ht_cap->cap &
2066 IEEE80211_HT_CAP_SGI_20))
2067 break;
2068 if (tbl->is_ht40 && !(ht_cap->cap &
2069 IEEE80211_HT_CAP_SGI_40))
2070 break;
2071
2072 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
2073
2074 /* Set up new search table for MIMO */
2075 memcpy(search_tbl, tbl, sz);
2076 search_tbl->is_SGI = !tbl->is_SGI;
2077 rs_set_expected_tpt_table(lq_sta, search_tbl);
2078 /*
2079 * If active table already uses the fastest possible
2080 * modulation (dual stream with short guard interval),
2081 * and it's working well, there's no need to look
2082 * for a better type of modulation!
2083 */
2084 if (tbl->is_SGI) {
2085 s32 tpt = lq_sta->last_tpt / 100;
2086 if (tpt >= search_tbl->expected_tpt[index])
2087 break;
2088 }
2089 search_tbl->current_rate =
2090 rate_n_flags_from_tbl(priv, search_tbl,
2091 index, is_green);
2092 update_search_tbl_counter = 1;
2093 goto out;
2094 }
2095 tbl->action++;
2096 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2097 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2098
2099 if (tbl->action == start_action)
2100 break;
2101 }
2102 search_tbl->lq_type = LQ_NONE;
2103 return 0;
2104 out:
2105 lq_sta->search_better_tbl = 1;
2106 tbl->action++;
2107 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2108 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2109 if (update_search_tbl_counter)
2110 search_tbl->action = tbl->action;
2111
2112 return 0;
2113
2114 }
2115
2116 /*
2117 * Check whether we should continue using same modulation mode, or
2118 * begin search for a new mode, based on:
2119 * 1) # tx successes or failures while using this mode
2120 * 2) # times calling this function
2121 * 3) elapsed time in this mode (not used, for now)
2122 */
2123 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
2124 {
2125 struct iwl_scale_tbl_info *tbl;
2126 int i;
2127 int active_tbl;
2128 int flush_interval_passed = 0;
2129 struct iwl_priv *priv;
2130
2131 priv = lq_sta->drv;
2132 active_tbl = lq_sta->active_tbl;
2133
2134 tbl = &(lq_sta->lq_info[active_tbl]);
2135
2136 /* If we've been disallowing search, see if we should now allow it */
2137 if (lq_sta->stay_in_tbl) {
2138
2139 /* Elapsed time using current modulation mode */
2140 if (lq_sta->flush_timer)
2141 flush_interval_passed =
2142 time_after(jiffies,
2143 (unsigned long)(lq_sta->flush_timer +
2144 IWL_RATE_SCALE_FLUSH_INTVL));
2145
2146 /*
2147 * Check if we should allow search for new modulation mode.
2148 * If many frames have failed or succeeded, or we've used
2149 * this same modulation for a long time, allow search, and
2150 * reset history stats that keep track of whether we should
2151 * allow a new search. Also (below) reset all bitmaps and
2152 * stats in active history.
2153 */
2154 if (force_search ||
2155 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
2156 (lq_sta->total_success > lq_sta->max_success_limit) ||
2157 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
2158 && (flush_interval_passed))) {
2159 IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n:",
2160 lq_sta->total_failed,
2161 lq_sta->total_success,
2162 flush_interval_passed);
2163
2164 /* Allow search for new mode */
2165 lq_sta->stay_in_tbl = 0; /* only place reset */
2166 lq_sta->total_failed = 0;
2167 lq_sta->total_success = 0;
2168 lq_sta->flush_timer = 0;
2169
2170 /*
2171 * Else if we've used this modulation mode enough repetitions
2172 * (regardless of elapsed time or success/failure), reset
2173 * history bitmaps and rate-specific stats for all rates in
2174 * active table.
2175 */
2176 } else {
2177 lq_sta->table_count++;
2178 if (lq_sta->table_count >=
2179 lq_sta->table_count_limit) {
2180 lq_sta->table_count = 0;
2181
2182 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
2183 for (i = 0; i < IWL_RATE_COUNT; i++)
2184 rs_rate_scale_clear_window(
2185 &(tbl->win[i]));
2186 }
2187 }
2188
2189 /* If transitioning to allow "search", reset all history
2190 * bitmaps and stats in active table (this will become the new
2191 * "search" table). */
2192 if (!lq_sta->stay_in_tbl) {
2193 for (i = 0; i < IWL_RATE_COUNT; i++)
2194 rs_rate_scale_clear_window(&(tbl->win[i]));
2195 }
2196 }
2197 }
2198
2199 /*
2200 * setup rate table in uCode
2201 * return rate_n_flags as used in the table
2202 */
2203 static void rs_update_rate_tbl(struct iwl_priv *priv,
2204 struct iwl_rxon_context *ctx,
2205 struct iwl_lq_sta *lq_sta,
2206 struct iwl_scale_tbl_info *tbl,
2207 int index, u8 is_green)
2208 {
2209 u32 rate;
2210
2211 /* Update uCode's rate table. */
2212 rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2213 rs_fill_link_cmd(priv, lq_sta, rate);
2214 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2215 }
2216
2217 /*
2218 * Do rate scaling and search for new modulation mode.
2219 */
2220 static void rs_rate_scale_perform(struct iwl_priv *priv,
2221 struct sk_buff *skb,
2222 struct ieee80211_sta *sta,
2223 struct iwl_lq_sta *lq_sta)
2224 {
2225 struct ieee80211_hw *hw = priv->hw;
2226 struct ieee80211_conf *conf = &hw->conf;
2227 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2228 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2229 int low = IWL_RATE_INVALID;
2230 int high = IWL_RATE_INVALID;
2231 int index;
2232 int i;
2233 struct iwl_rate_scale_data *window = NULL;
2234 int current_tpt = IWL_INVALID_VALUE;
2235 int low_tpt = IWL_INVALID_VALUE;
2236 int high_tpt = IWL_INVALID_VALUE;
2237 u32 fail_count;
2238 s8 scale_action = 0;
2239 u16 rate_mask;
2240 u8 update_lq = 0;
2241 struct iwl_scale_tbl_info *tbl, *tbl1;
2242 u16 rate_scale_index_msk = 0;
2243 u8 is_green = 0;
2244 u8 active_tbl = 0;
2245 u8 done_search = 0;
2246 u16 high_low;
2247 s32 sr;
2248 u8 tid = MAX_TID_COUNT;
2249 struct iwl_tid_data *tid_data;
2250 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
2251 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
2252
2253 IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
2254
2255 /* Send management frames and NO_ACK data using lowest rate. */
2256 /* TODO: this could probably be improved.. */
2257 if (!ieee80211_is_data(hdr->frame_control) ||
2258 info->flags & IEEE80211_TX_CTL_NO_ACK)
2259 return;
2260
2261 if (!sta || !lq_sta)
2262 return;
2263
2264 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
2265
2266 tid = rs_tl_add_packet(lq_sta, hdr);
2267 if ((tid != MAX_TID_COUNT) && (lq_sta->tx_agg_tid_en & (1 << tid))) {
2268 tid_data = &priv->stations[lq_sta->lq.sta_id].tid[tid];
2269 if (tid_data->agg.state == IWL_AGG_OFF)
2270 lq_sta->is_agg = 0;
2271 else
2272 lq_sta->is_agg = 1;
2273 } else
2274 lq_sta->is_agg = 0;
2275
2276 /*
2277 * Select rate-scale / modulation-mode table to work with in
2278 * the rest of this function: "search" if searching for better
2279 * modulation mode, or "active" if doing rate scaling within a mode.
2280 */
2281 if (!lq_sta->search_better_tbl)
2282 active_tbl = lq_sta->active_tbl;
2283 else
2284 active_tbl = 1 - lq_sta->active_tbl;
2285
2286 tbl = &(lq_sta->lq_info[active_tbl]);
2287 if (is_legacy(tbl->lq_type))
2288 lq_sta->is_green = 0;
2289 else
2290 lq_sta->is_green = rs_use_green(sta);
2291 is_green = lq_sta->is_green;
2292
2293 /* current tx rate */
2294 index = lq_sta->last_txrate_idx;
2295
2296 IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2297 tbl->lq_type);
2298
2299 /* rates available for this association, and for modulation mode */
2300 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2301
2302 IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
2303
2304 /* mask with station rate restriction */
2305 if (is_legacy(tbl->lq_type)) {
2306 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2307 /* supp_rates has no CCK bits in A mode */
2308 rate_scale_index_msk = (u16) (rate_mask &
2309 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2310 else
2311 rate_scale_index_msk = (u16) (rate_mask &
2312 lq_sta->supp_rates);
2313
2314 } else
2315 rate_scale_index_msk = rate_mask;
2316
2317 if (!rate_scale_index_msk)
2318 rate_scale_index_msk = rate_mask;
2319
2320 if (!((1 << index) & rate_scale_index_msk)) {
2321 IWL_ERR(priv, "Current Rate is not valid\n");
2322 if (lq_sta->search_better_tbl) {
2323 /* revert to active table if search table is not valid*/
2324 tbl->lq_type = LQ_NONE;
2325 lq_sta->search_better_tbl = 0;
2326 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2327 /* get "active" rate info */
2328 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2329 rs_update_rate_tbl(priv, ctx, lq_sta, tbl,
2330 index, is_green);
2331 }
2332 return;
2333 }
2334
2335 /* Get expected throughput table and history window for current rate */
2336 if (!tbl->expected_tpt) {
2337 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2338 return;
2339 }
2340
2341 /* force user max rate if set by user */
2342 if ((lq_sta->max_rate_idx != -1) &&
2343 (lq_sta->max_rate_idx < index)) {
2344 index = lq_sta->max_rate_idx;
2345 update_lq = 1;
2346 window = &(tbl->win[index]);
2347 goto lq_update;
2348 }
2349
2350 window = &(tbl->win[index]);
2351
2352 /*
2353 * If there is not enough history to calculate actual average
2354 * throughput, keep analyzing results of more tx frames, without
2355 * changing rate or mode (bypass most of the rest of this function).
2356 * Set up new rate table in uCode only if old rate is not supported
2357 * in current association (use new rate found above).
2358 */
2359 fail_count = window->counter - window->success_counter;
2360 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2361 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2362 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2363 "for index %d\n",
2364 window->success_counter, window->counter, index);
2365
2366 /* Can't calculate this yet; not enough history */
2367 window->average_tpt = IWL_INVALID_VALUE;
2368
2369 /* Should we stay with this modulation mode,
2370 * or search for a new one? */
2371 rs_stay_in_table(lq_sta, false);
2372
2373 goto out;
2374 }
2375 /* Else we have enough samples; calculate estimate of
2376 * actual average throughput */
2377 if (window->average_tpt != ((window->success_ratio *
2378 tbl->expected_tpt[index] + 64) / 128)) {
2379 IWL_ERR(priv, "expected_tpt should have been calculated by now\n");
2380 window->average_tpt = ((window->success_ratio *
2381 tbl->expected_tpt[index] + 64) / 128);
2382 }
2383
2384 /* If we are searching for better modulation mode, check success. */
2385 if (lq_sta->search_better_tbl &&
2386 (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
2387 /* If good success, continue using the "search" mode;
2388 * no need to send new link quality command, since we're
2389 * continuing to use the setup that we've been trying. */
2390 if (window->average_tpt > lq_sta->last_tpt) {
2391
2392 IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2393 "suc=%d cur-tpt=%d old-tpt=%d\n",
2394 window->success_ratio,
2395 window->average_tpt,
2396 lq_sta->last_tpt);
2397
2398 if (!is_legacy(tbl->lq_type))
2399 lq_sta->enable_counter = 1;
2400
2401 /* Swap tables; "search" becomes "active" */
2402 lq_sta->active_tbl = active_tbl;
2403 current_tpt = window->average_tpt;
2404
2405 /* Else poor success; go back to mode in "active" table */
2406 } else {
2407
2408 IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2409 "suc=%d cur-tpt=%d old-tpt=%d\n",
2410 window->success_ratio,
2411 window->average_tpt,
2412 lq_sta->last_tpt);
2413
2414 /* Nullify "search" table */
2415 tbl->lq_type = LQ_NONE;
2416
2417 /* Revert to "active" table */
2418 active_tbl = lq_sta->active_tbl;
2419 tbl = &(lq_sta->lq_info[active_tbl]);
2420
2421 /* Revert to "active" rate and throughput info */
2422 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2423 current_tpt = lq_sta->last_tpt;
2424
2425 /* Need to set up a new rate table in uCode */
2426 update_lq = 1;
2427 }
2428
2429 /* Either way, we've made a decision; modulation mode
2430 * search is done, allow rate adjustment next time. */
2431 lq_sta->search_better_tbl = 0;
2432 done_search = 1; /* Don't switch modes below! */
2433 goto lq_update;
2434 }
2435
2436 /* (Else) not in search of better modulation mode, try for better
2437 * starting rate, while staying in this mode. */
2438 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2439 tbl->lq_type);
2440 low = high_low & 0xff;
2441 high = (high_low >> 8) & 0xff;
2442
2443 /* If user set max rate, dont allow higher than user constrain */
2444 if ((lq_sta->max_rate_idx != -1) &&
2445 (lq_sta->max_rate_idx < high))
2446 high = IWL_RATE_INVALID;
2447
2448 sr = window->success_ratio;
2449
2450 /* Collect measured throughputs for current and adjacent rates */
2451 current_tpt = window->average_tpt;
2452 if (low != IWL_RATE_INVALID)
2453 low_tpt = tbl->win[low].average_tpt;
2454 if (high != IWL_RATE_INVALID)
2455 high_tpt = tbl->win[high].average_tpt;
2456
2457 scale_action = 0;
2458
2459 /* Too many failures, decrease rate */
2460 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2461 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2462 scale_action = -1;
2463
2464 /* No throughput measured yet for adjacent rates; try increase. */
2465 } else if ((low_tpt == IWL_INVALID_VALUE) &&
2466 (high_tpt == IWL_INVALID_VALUE)) {
2467
2468 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2469 scale_action = 1;
2470 else if (low != IWL_RATE_INVALID)
2471 scale_action = 0;
2472 }
2473
2474 /* Both adjacent throughputs are measured, but neither one has better
2475 * throughput; we're using the best rate, don't change it! */
2476 else if ((low_tpt != IWL_INVALID_VALUE) &&
2477 (high_tpt != IWL_INVALID_VALUE) &&
2478 (low_tpt < current_tpt) &&
2479 (high_tpt < current_tpt))
2480 scale_action = 0;
2481
2482 /* At least one adjacent rate's throughput is measured,
2483 * and may have better performance. */
2484 else {
2485 /* Higher adjacent rate's throughput is measured */
2486 if (high_tpt != IWL_INVALID_VALUE) {
2487 /* Higher rate has better throughput */
2488 if (high_tpt > current_tpt &&
2489 sr >= IWL_RATE_INCREASE_TH) {
2490 scale_action = 1;
2491 } else {
2492 scale_action = 0;
2493 }
2494
2495 /* Lower adjacent rate's throughput is measured */
2496 } else if (low_tpt != IWL_INVALID_VALUE) {
2497 /* Lower rate has better throughput */
2498 if (low_tpt > current_tpt) {
2499 IWL_DEBUG_RATE(priv,
2500 "decrease rate because of low tpt\n");
2501 scale_action = -1;
2502 } else if (sr >= IWL_RATE_INCREASE_TH) {
2503 scale_action = 1;
2504 }
2505 }
2506 }
2507
2508 /* Sanity check; asked for decrease, but success rate or throughput
2509 * has been good at old rate. Don't change it. */
2510 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2511 ((sr > IWL_RATE_HIGH_TH) ||
2512 (current_tpt > (100 * tbl->expected_tpt[low]))))
2513 scale_action = 0;
2514 if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2515 scale_action = -1;
2516 if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
2517 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2518 scale_action = -1;
2519
2520 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2521 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2522 if (lq_sta->last_bt_traffic > priv->bt_traffic_load) {
2523 /*
2524 * don't set scale_action, don't want to scale up if
2525 * the rate scale doesn't otherwise think that is a
2526 * good idea.
2527 */
2528 } else if (lq_sta->last_bt_traffic <= priv->bt_traffic_load) {
2529 scale_action = -1;
2530 }
2531 }
2532 lq_sta->last_bt_traffic = priv->bt_traffic_load;
2533
2534 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2535 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2536 /* search for a new modulation */
2537 rs_stay_in_table(lq_sta, true);
2538 goto lq_update;
2539 }
2540
2541 switch (scale_action) {
2542 case -1:
2543 /* Decrease starting rate, update uCode's rate table */
2544 if (low != IWL_RATE_INVALID) {
2545 update_lq = 1;
2546 index = low;
2547 }
2548
2549 break;
2550 case 1:
2551 /* Increase starting rate, update uCode's rate table */
2552 if (high != IWL_RATE_INVALID) {
2553 update_lq = 1;
2554 index = high;
2555 }
2556
2557 break;
2558 case 0:
2559 /* No change */
2560 default:
2561 break;
2562 }
2563
2564 IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2565 "high %d type %d\n",
2566 index, scale_action, low, high, tbl->lq_type);
2567
2568 lq_update:
2569 /* Replace uCode's rate table for the destination station. */
2570 if (update_lq)
2571 rs_update_rate_tbl(priv, ctx, lq_sta, tbl, index, is_green);
2572
2573 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
2574 /* Should we stay with this modulation mode,
2575 * or search for a new one? */
2576 rs_stay_in_table(lq_sta, false);
2577 }
2578 /*
2579 * Search for new modulation mode if we're:
2580 * 1) Not changing rates right now
2581 * 2) Not just finishing up a search
2582 * 3) Allowing a new search
2583 */
2584 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2585 /* Save current throughput to compare with "search" throughput*/
2586 lq_sta->last_tpt = current_tpt;
2587
2588 /* Select a new "search" modulation mode to try.
2589 * If one is found, set up the new "search" table. */
2590 if (is_legacy(tbl->lq_type))
2591 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2592 else if (is_siso(tbl->lq_type))
2593 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2594 else if (is_mimo2(tbl->lq_type))
2595 rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2596 else
2597 rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2598
2599 /* If new "search" mode was selected, set up in uCode table */
2600 if (lq_sta->search_better_tbl) {
2601 /* Access the "search" table, clear its history. */
2602 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2603 for (i = 0; i < IWL_RATE_COUNT; i++)
2604 rs_rate_scale_clear_window(&(tbl->win[i]));
2605
2606 /* Use new "search" start rate */
2607 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2608
2609 IWL_DEBUG_RATE(priv, "Switch current mcs: %X index: %d\n",
2610 tbl->current_rate, index);
2611 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2612 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2613 } else
2614 done_search = 1;
2615 }
2616
2617 if (done_search && !lq_sta->stay_in_tbl) {
2618 /* If the "active" (non-search) mode was legacy,
2619 * and we've tried switching antennas,
2620 * but we haven't been able to try HT modes (not available),
2621 * stay with best antenna legacy modulation for a while
2622 * before next round of mode comparisons. */
2623 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2624 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2625 lq_sta->action_counter > tbl1->max_search) {
2626 IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2627 rs_set_stay_in_table(priv, 1, lq_sta);
2628 }
2629
2630 /* If we're in an HT mode, and all 3 mode switch actions
2631 * have been tried and compared, stay in this best modulation
2632 * mode for a while before next round of mode comparisons. */
2633 if (lq_sta->enable_counter &&
2634 (lq_sta->action_counter >= tbl1->max_search) &&
2635 iwl_ht_enabled(priv)) {
2636 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2637 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2638 (tid != MAX_TID_COUNT)) {
2639 tid_data =
2640 &priv->stations[lq_sta->lq.sta_id].tid[tid];
2641 if (tid_data->agg.state == IWL_AGG_OFF) {
2642 IWL_DEBUG_RATE(priv,
2643 "try to aggregate tid %d\n",
2644 tid);
2645 rs_tl_turn_on_agg(priv, tid,
2646 lq_sta, sta);
2647 }
2648 }
2649 rs_set_stay_in_table(priv, 0, lq_sta);
2650 }
2651 }
2652
2653 out:
2654 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2655 i = index;
2656 lq_sta->last_txrate_idx = i;
2657 }
2658
2659 /**
2660 * rs_initialize_lq - Initialize a station's hardware rate table
2661 *
2662 * The uCode's station table contains a table of fallback rates
2663 * for automatic fallback during transmission.
2664 *
2665 * NOTE: This sets up a default set of values. These will be replaced later
2666 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2667 * rc80211_simple.
2668 *
2669 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2670 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2671 * which requires station table entry to exist).
2672 */
2673 static void rs_initialize_lq(struct iwl_priv *priv,
2674 struct ieee80211_conf *conf,
2675 struct ieee80211_sta *sta,
2676 struct iwl_lq_sta *lq_sta)
2677 {
2678 struct iwl_scale_tbl_info *tbl;
2679 int rate_idx;
2680 int i;
2681 u32 rate;
2682 u8 use_green = rs_use_green(sta);
2683 u8 active_tbl = 0;
2684 u8 valid_tx_ant;
2685 struct iwl_station_priv *sta_priv;
2686 struct iwl_rxon_context *ctx;
2687
2688 if (!sta || !lq_sta)
2689 return;
2690
2691 sta_priv = (void *)sta->drv_priv;
2692 ctx = sta_priv->common.ctx;
2693
2694 i = lq_sta->last_txrate_idx;
2695
2696 valid_tx_ant = priv->hw_params.valid_tx_ant;
2697
2698 if (!lq_sta->search_better_tbl)
2699 active_tbl = lq_sta->active_tbl;
2700 else
2701 active_tbl = 1 - lq_sta->active_tbl;
2702
2703 tbl = &(lq_sta->lq_info[active_tbl]);
2704
2705 if ((i < 0) || (i >= IWL_RATE_COUNT))
2706 i = 0;
2707
2708 rate = iwl_rates[i].plcp;
2709 tbl->ant_type = first_antenna(valid_tx_ant);
2710 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2711
2712 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2713 rate |= RATE_MCS_CCK_MSK;
2714
2715 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2716 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2717 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2718
2719 rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2720 tbl->current_rate = rate;
2721 rs_set_expected_tpt_table(lq_sta, tbl);
2722 rs_fill_link_cmd(NULL, lq_sta, rate);
2723 priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2724 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_SYNC, true);
2725 }
2726
2727 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2728 struct ieee80211_tx_rate_control *txrc)
2729 {
2730
2731 struct sk_buff *skb = txrc->skb;
2732 struct ieee80211_supported_band *sband = txrc->sband;
2733 struct iwl_priv *priv __maybe_unused = (struct iwl_priv *)priv_r;
2734 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2735 struct iwl_lq_sta *lq_sta = priv_sta;
2736 int rate_idx;
2737
2738 IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2739
2740 /* Get max rate if user set max rate */
2741 if (lq_sta) {
2742 lq_sta->max_rate_idx = txrc->max_rate_idx;
2743 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2744 (lq_sta->max_rate_idx != -1))
2745 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2746 if ((lq_sta->max_rate_idx < 0) ||
2747 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2748 lq_sta->max_rate_idx = -1;
2749 }
2750
2751 /* Treat uninitialized rate scaling data same as non-existing. */
2752 if (lq_sta && !lq_sta->drv) {
2753 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
2754 priv_sta = NULL;
2755 }
2756
2757 /* Send management frames and NO_ACK data using lowest rate. */
2758 if (rate_control_send_low(sta, priv_sta, txrc))
2759 return;
2760
2761 rate_idx = lq_sta->last_txrate_idx;
2762
2763 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2764 rate_idx -= IWL_FIRST_OFDM_RATE;
2765 /* 6M and 9M shared same MCS index */
2766 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2767 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2768 IWL_RATE_MIMO3_6M_PLCP)
2769 rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2770 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2771 IWL_RATE_MIMO2_6M_PLCP)
2772 rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2773 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2774 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2775 info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2776 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2777 info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
2778 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2779 info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2780 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2781 info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2782 } else {
2783 /* Check for invalid rates */
2784 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2785 ((sband->band == IEEE80211_BAND_5GHZ) &&
2786 (rate_idx < IWL_FIRST_OFDM_RATE)))
2787 rate_idx = rate_lowest_index(sband, sta);
2788 /* On valid 5 GHz rate, adjust index */
2789 else if (sband->band == IEEE80211_BAND_5GHZ)
2790 rate_idx -= IWL_FIRST_OFDM_RATE;
2791 info->control.rates[0].flags = 0;
2792 }
2793 info->control.rates[0].idx = rate_idx;
2794
2795 }
2796
2797 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2798 gfp_t gfp)
2799 {
2800 struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2801 struct iwl_priv *priv;
2802
2803 priv = (struct iwl_priv *)priv_rate;
2804 IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2805
2806 return &sta_priv->lq_sta;
2807 }
2808
2809 /*
2810 * Called after adding a new station to initialize rate scaling
2811 */
2812 void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id)
2813 {
2814 int i, j;
2815 struct ieee80211_hw *hw = priv->hw;
2816 struct ieee80211_conf *conf = &priv->hw->conf;
2817 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2818 struct iwl_station_priv *sta_priv;
2819 struct iwl_lq_sta *lq_sta;
2820 struct ieee80211_supported_band *sband;
2821
2822 sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2823 lq_sta = &sta_priv->lq_sta;
2824 sband = hw->wiphy->bands[conf->channel->band];
2825
2826
2827 lq_sta->lq.sta_id = sta_id;
2828
2829 for (j = 0; j < LQ_SIZE; j++)
2830 for (i = 0; i < IWL_RATE_COUNT; i++)
2831 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2832
2833 lq_sta->flush_timer = 0;
2834 lq_sta->supp_rates = sta->supp_rates[sband->band];
2835 for (j = 0; j < LQ_SIZE; j++)
2836 for (i = 0; i < IWL_RATE_COUNT; i++)
2837 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2838
2839 IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n",
2840 sta_id);
2841 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2842 * the lowest or the highest rate.. Could consider using RSSI from
2843 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2844 * after assoc.. */
2845
2846 lq_sta->is_dup = 0;
2847 lq_sta->max_rate_idx = -1;
2848 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2849 lq_sta->is_green = rs_use_green(sta);
2850 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2851 lq_sta->band = priv->band;
2852 /*
2853 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2854 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2855 */
2856 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2857 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2858 lq_sta->active_siso_rate &= ~((u16)0x2);
2859 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2860
2861 /* Same here */
2862 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2863 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2864 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2865 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2866
2867 lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2868 lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2869 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2870 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2871
2872 IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2873 lq_sta->active_siso_rate,
2874 lq_sta->active_mimo2_rate,
2875 lq_sta->active_mimo3_rate);
2876
2877 /* These values will be overridden later */
2878 lq_sta->lq.general_params.single_stream_ant_msk =
2879 first_antenna(priv->hw_params.valid_tx_ant);
2880 lq_sta->lq.general_params.dual_stream_ant_msk =
2881 priv->hw_params.valid_tx_ant &
2882 ~first_antenna(priv->hw_params.valid_tx_ant);
2883 if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2884 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2885 } else if (num_of_ant(priv->hw_params.valid_tx_ant) == 2) {
2886 lq_sta->lq.general_params.dual_stream_ant_msk =
2887 priv->hw_params.valid_tx_ant;
2888 }
2889
2890 /* as default allow aggregation for all tids */
2891 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2892 lq_sta->drv = priv;
2893
2894 /* Set last_txrate_idx to lowest rate */
2895 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2896 if (sband->band == IEEE80211_BAND_5GHZ)
2897 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2898 lq_sta->is_agg = 0;
2899
2900 priv->dbg_fixed_rate = 0;
2901 #ifdef CONFIG_MAC80211_DEBUGFS
2902 lq_sta->dbg_fixed_rate = 0;
2903 #endif
2904
2905 rs_initialize_lq(priv, conf, sta, lq_sta);
2906 }
2907
2908 static void rs_fill_link_cmd(struct iwl_priv *priv,
2909 struct iwl_lq_sta *lq_sta, u32 new_rate)
2910 {
2911 struct iwl_scale_tbl_info tbl_type;
2912 int index = 0;
2913 int rate_idx;
2914 int repeat_rate = 0;
2915 u8 ant_toggle_cnt = 0;
2916 u8 use_ht_possible = 1;
2917 u8 valid_tx_ant = 0;
2918 struct iwl_station_priv *sta_priv =
2919 container_of(lq_sta, struct iwl_station_priv, lq_sta);
2920 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2921
2922 /* Override starting rate (index 0) if needed for debug purposes */
2923 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2924
2925 /* Interpret new_rate (rate_n_flags) */
2926 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2927 &tbl_type, &rate_idx);
2928
2929 if (priv && priv->bt_full_concurrent) {
2930 /* 1x1 only */
2931 tbl_type.ant_type =
2932 first_antenna(priv->hw_params.valid_tx_ant);
2933 }
2934
2935 /* How many times should we repeat the initial rate? */
2936 if (is_legacy(tbl_type.lq_type)) {
2937 ant_toggle_cnt = 1;
2938 repeat_rate = IWL_NUMBER_TRY;
2939 } else {
2940 repeat_rate = min(IWL_HT_NUMBER_TRY,
2941 LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2942 }
2943
2944 lq_cmd->general_params.mimo_delimiter =
2945 is_mimo(tbl_type.lq_type) ? 1 : 0;
2946
2947 /* Fill 1st table entry (index 0) */
2948 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2949
2950 if (num_of_ant(tbl_type.ant_type) == 1) {
2951 lq_cmd->general_params.single_stream_ant_msk =
2952 tbl_type.ant_type;
2953 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2954 lq_cmd->general_params.dual_stream_ant_msk =
2955 tbl_type.ant_type;
2956 } /* otherwise we don't modify the existing value */
2957
2958 index++;
2959 repeat_rate--;
2960 if (priv) {
2961 if (priv->bt_full_concurrent)
2962 valid_tx_ant = ANT_A;
2963 else
2964 valid_tx_ant = priv->hw_params.valid_tx_ant;
2965 }
2966
2967 /* Fill rest of rate table */
2968 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2969 /* Repeat initial/next rate.
2970 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2971 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2972 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2973 if (is_legacy(tbl_type.lq_type)) {
2974 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2975 ant_toggle_cnt++;
2976 else if (priv &&
2977 rs_toggle_antenna(valid_tx_ant,
2978 &new_rate, &tbl_type))
2979 ant_toggle_cnt = 1;
2980 }
2981
2982 /* Override next rate if needed for debug purposes */
2983 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2984
2985 /* Fill next table entry */
2986 lq_cmd->rs_table[index].rate_n_flags =
2987 cpu_to_le32(new_rate);
2988 repeat_rate--;
2989 index++;
2990 }
2991
2992 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2993 &rate_idx);
2994
2995 if (priv && priv->bt_full_concurrent) {
2996 /* 1x1 only */
2997 tbl_type.ant_type =
2998 first_antenna(priv->hw_params.valid_tx_ant);
2999 }
3000
3001 /* Indicate to uCode which entries might be MIMO.
3002 * If initial rate was MIMO, this will finally end up
3003 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
3004 if (is_mimo(tbl_type.lq_type))
3005 lq_cmd->general_params.mimo_delimiter = index;
3006
3007 /* Get next rate */
3008 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
3009 use_ht_possible);
3010
3011 /* How many times should we repeat the next rate? */
3012 if (is_legacy(tbl_type.lq_type)) {
3013 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
3014 ant_toggle_cnt++;
3015 else if (priv &&
3016 rs_toggle_antenna(valid_tx_ant,
3017 &new_rate, &tbl_type))
3018 ant_toggle_cnt = 1;
3019
3020 repeat_rate = IWL_NUMBER_TRY;
3021 } else {
3022 repeat_rate = IWL_HT_NUMBER_TRY;
3023 }
3024
3025 /* Don't allow HT rates after next pass.
3026 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
3027 use_ht_possible = 0;
3028
3029 /* Override next rate if needed for debug purposes */
3030 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
3031
3032 /* Fill next table entry */
3033 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
3034
3035 index++;
3036 repeat_rate--;
3037 }
3038
3039 lq_cmd->agg_params.agg_frame_cnt_limit =
3040 sta_priv->max_agg_bufsize ?: LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3041 lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
3042
3043 lq_cmd->agg_params.agg_time_limit =
3044 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
3045 /*
3046 * overwrite if needed, pass aggregation time limit
3047 * to uCode in uSec
3048 */
3049 if (priv && priv->cfg->bt_params &&
3050 priv->cfg->bt_params->agg_time_limit &&
3051 priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH)
3052 lq_cmd->agg_params.agg_time_limit =
3053 cpu_to_le16(priv->cfg->bt_params->agg_time_limit);
3054 }
3055
3056 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3057 {
3058 return hw->priv;
3059 }
3060 /* rate scale requires free function to be implemented */
3061 static void rs_free(void *priv_rate)
3062 {
3063 return;
3064 }
3065
3066 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
3067 void *priv_sta)
3068 {
3069 struct iwl_priv *priv __maybe_unused = priv_r;
3070
3071 IWL_DEBUG_RATE(priv, "enter\n");
3072 IWL_DEBUG_RATE(priv, "leave\n");
3073 }
3074
3075 #ifdef CONFIG_MAC80211_DEBUGFS
3076 static int open_file_generic(struct inode *inode, struct file *file)
3077 {
3078 file->private_data = inode->i_private;
3079 return 0;
3080 }
3081 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
3082 u32 *rate_n_flags, int index)
3083 {
3084 struct iwl_priv *priv;
3085 u8 valid_tx_ant;
3086 u8 ant_sel_tx;
3087
3088 priv = lq_sta->drv;
3089 valid_tx_ant = priv->hw_params.valid_tx_ant;
3090 if (lq_sta->dbg_fixed_rate) {
3091 ant_sel_tx =
3092 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
3093 >> RATE_MCS_ANT_POS);
3094 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
3095 *rate_n_flags = lq_sta->dbg_fixed_rate;
3096 IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
3097 } else {
3098 lq_sta->dbg_fixed_rate = 0;
3099 priv->dbg_fixed_rate = 0;
3100 IWL_ERR(priv,
3101 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
3102 ant_sel_tx, valid_tx_ant);
3103 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3104 }
3105 } else {
3106 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3107 }
3108 }
3109
3110 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3111 const char __user *user_buf, size_t count, loff_t *ppos)
3112 {
3113 struct iwl_lq_sta *lq_sta = file->private_data;
3114 struct iwl_priv *priv;
3115 char buf[64];
3116 size_t buf_size;
3117 u32 parsed_rate;
3118
3119
3120 priv = lq_sta->drv;
3121 memset(buf, 0, sizeof(buf));
3122 buf_size = min(count, sizeof(buf) - 1);
3123 if (copy_from_user(buf, user_buf, buf_size))
3124 return -EFAULT;
3125
3126 if (sscanf(buf, "%x", &parsed_rate) == 1)
3127 priv->dbg_fixed_rate = lq_sta->dbg_fixed_rate = parsed_rate;
3128 else
3129 priv->dbg_fixed_rate = lq_sta->dbg_fixed_rate = 0;
3130
3131 rs_program_fix_rate(priv, lq_sta);
3132
3133 return count;
3134 }
3135
3136 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3137 char __user *user_buf, size_t count, loff_t *ppos)
3138 {
3139 char *buff;
3140 int desc = 0;
3141 int i = 0;
3142 int index = 0;
3143 ssize_t ret;
3144
3145 struct iwl_lq_sta *lq_sta = file->private_data;
3146 struct iwl_priv *priv;
3147 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3148
3149 priv = lq_sta->drv;
3150 buff = kmalloc(1024, GFP_KERNEL);
3151 if (!buff)
3152 return -ENOMEM;
3153
3154 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3155 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
3156 lq_sta->total_failed, lq_sta->total_success,
3157 lq_sta->active_legacy_rate);
3158 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3159 priv->dbg_fixed_rate);
3160 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3161 (priv->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
3162 (priv->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
3163 (priv->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
3164 desc += sprintf(buff+desc, "lq type %s\n",
3165 (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
3166 if (is_Ht(tbl->lq_type)) {
3167 desc += sprintf(buff+desc, " %s",
3168 (is_siso(tbl->lq_type)) ? "SISO" :
3169 ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
3170 desc += sprintf(buff+desc, " %s",
3171 (tbl->is_ht40) ? "40MHz" : "20MHz");
3172 desc += sprintf(buff+desc, " %s %s %s\n", (tbl->is_SGI) ? "SGI" : "",
3173 (lq_sta->is_green) ? "GF enabled" : "",
3174 (lq_sta->is_agg) ? "AGG on" : "");
3175 }
3176 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3177 lq_sta->last_rate_n_flags);
3178 desc += sprintf(buff+desc, "general:"
3179 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
3180 lq_sta->lq.general_params.flags,
3181 lq_sta->lq.general_params.mimo_delimiter,
3182 lq_sta->lq.general_params.single_stream_ant_msk,
3183 lq_sta->lq.general_params.dual_stream_ant_msk);
3184
3185 desc += sprintf(buff+desc, "agg:"
3186 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3187 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
3188 lq_sta->lq.agg_params.agg_dis_start_th,
3189 lq_sta->lq.agg_params.agg_frame_cnt_limit);
3190
3191 desc += sprintf(buff+desc,
3192 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3193 lq_sta->lq.general_params.start_rate_index[0],
3194 lq_sta->lq.general_params.start_rate_index[1],
3195 lq_sta->lq.general_params.start_rate_index[2],
3196 lq_sta->lq.general_params.start_rate_index[3]);
3197
3198 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3199 index = iwl_hwrate_to_plcp_idx(
3200 le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
3201 if (is_legacy(tbl->lq_type)) {
3202 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
3203 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3204 iwl_rate_mcs[index].mbps);
3205 } else {
3206 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
3207 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3208 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
3209 }
3210 }
3211
3212 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3213 kfree(buff);
3214 return ret;
3215 }
3216
3217 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3218 .write = rs_sta_dbgfs_scale_table_write,
3219 .read = rs_sta_dbgfs_scale_table_read,
3220 .open = open_file_generic,
3221 .llseek = default_llseek,
3222 };
3223 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3224 char __user *user_buf, size_t count, loff_t *ppos)
3225 {
3226 char *buff;
3227 int desc = 0;
3228 int i, j;
3229 ssize_t ret;
3230
3231 struct iwl_lq_sta *lq_sta = file->private_data;
3232
3233 buff = kmalloc(1024, GFP_KERNEL);
3234 if (!buff)
3235 return -ENOMEM;
3236
3237 for (i = 0; i < LQ_SIZE; i++) {
3238 desc += sprintf(buff+desc,
3239 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
3240 "rate=0x%X\n",
3241 lq_sta->active_tbl == i ? "*" : "x",
3242 lq_sta->lq_info[i].lq_type,
3243 lq_sta->lq_info[i].is_SGI,
3244 lq_sta->lq_info[i].is_ht40,
3245 lq_sta->lq_info[i].is_dup,
3246 lq_sta->is_green,
3247 lq_sta->lq_info[i].current_rate);
3248 for (j = 0; j < IWL_RATE_COUNT; j++) {
3249 desc += sprintf(buff+desc,
3250 "counter=%d success=%d %%=%d\n",
3251 lq_sta->lq_info[i].win[j].counter,
3252 lq_sta->lq_info[i].win[j].success_counter,
3253 lq_sta->lq_info[i].win[j].success_ratio);
3254 }
3255 }
3256 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3257 kfree(buff);
3258 return ret;
3259 }
3260
3261 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3262 .read = rs_sta_dbgfs_stats_table_read,
3263 .open = open_file_generic,
3264 .llseek = default_llseek,
3265 };
3266
3267 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3268 char __user *user_buf, size_t count, loff_t *ppos)
3269 {
3270 struct iwl_lq_sta *lq_sta = file->private_data;
3271 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3272 char buff[120];
3273 int desc = 0;
3274
3275 if (is_Ht(tbl->lq_type))
3276 desc += sprintf(buff+desc,
3277 "Bit Rate= %d Mb/s\n",
3278 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3279 else
3280 desc += sprintf(buff+desc,
3281 "Bit Rate= %d Mb/s\n",
3282 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3283
3284 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3285 }
3286
3287 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3288 .read = rs_sta_dbgfs_rate_scale_data_read,
3289 .open = open_file_generic,
3290 .llseek = default_llseek,
3291 };
3292
3293 static void rs_add_debugfs(void *priv, void *priv_sta,
3294 struct dentry *dir)
3295 {
3296 struct iwl_lq_sta *lq_sta = priv_sta;
3297 lq_sta->rs_sta_dbgfs_scale_table_file =
3298 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3299 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3300 lq_sta->rs_sta_dbgfs_stats_table_file =
3301 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3302 lq_sta, &rs_sta_dbgfs_stats_table_ops);
3303 lq_sta->rs_sta_dbgfs_rate_scale_data_file =
3304 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
3305 lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
3306 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
3307 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3308 &lq_sta->tx_agg_tid_en);
3309
3310 }
3311
3312 static void rs_remove_debugfs(void *priv, void *priv_sta)
3313 {
3314 struct iwl_lq_sta *lq_sta = priv_sta;
3315 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3316 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
3317 debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
3318 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
3319 }
3320 #endif
3321
3322 /*
3323 * Initialization of rate scaling information is done by driver after
3324 * the station is added. Since mac80211 calls this function before a
3325 * station is added we ignore it.
3326 */
3327 static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband,
3328 struct ieee80211_sta *sta, void *priv_sta)
3329 {
3330 }
3331 static struct rate_control_ops rs_ops = {
3332 .module = NULL,
3333 .name = RS_NAME,
3334 .tx_status = rs_tx_status,
3335 .get_rate = rs_get_rate,
3336 .rate_init = rs_rate_init_stub,
3337 .alloc = rs_alloc,
3338 .free = rs_free,
3339 .alloc_sta = rs_alloc_sta,
3340 .free_sta = rs_free_sta,
3341 #ifdef CONFIG_MAC80211_DEBUGFS
3342 .add_sta_debugfs = rs_add_debugfs,
3343 .remove_sta_debugfs = rs_remove_debugfs,
3344 #endif
3345 };
3346
3347 int iwlagn_rate_control_register(void)
3348 {
3349 return ieee80211_rate_control_register(&rs_ops);
3350 }
3351
3352 void iwlagn_rate_control_unregister(void)
3353 {
3354 ieee80211_rate_control_unregister(&rs_ops);
3355 }
3356
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree