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Merge branch 'akpm'
[linux-2.6/next.git] / drivers / net / wireless / iwlwifi / iwl-agn-rs.c
blob1fa438e20f0adb01cd85fc1f897dcc8bb74580ed
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 <net/mac80211.h>
31
32 #include <linux/netdevice.h>
33 #include <linux/etherdevice.h>
34 #include <linux/delay.h>
35
36 #include <linux/workqueue.h>
37
38 #include "iwl-dev.h"
39 #include "iwl-sta.h"
40 #include "iwl-core.h"
41 #include "iwl-agn.h"
42
43 #define RS_NAME "iwl-agn-rs"
44
45 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
46 #define IWL_NUMBER_TRY 1
47 #define IWL_HT_NUMBER_TRY 3
48
49 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
50 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
51 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
52
53 /* max allowed rate miss before sync LQ cmd */
54 #define IWL_MISSED_RATE_MAX 15
55 /* max time to accum history 2 seconds */
56 #define IWL_RATE_SCALE_FLUSH_INTVL (3*HZ)
57
58 static u8 rs_ht_to_legacy[] = {
59 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
60 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
61 IWL_RATE_6M_INDEX,
62 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
63 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
64 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
65 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
66 };
67
68 static const u8 ant_toggle_lookup[] = {
69 /*ANT_NONE -> */ ANT_NONE,
70 /*ANT_A -> */ ANT_B,
71 /*ANT_B -> */ ANT_C,
72 /*ANT_AB -> */ ANT_BC,
73 /*ANT_C -> */ ANT_A,
74 /*ANT_AC -> */ ANT_AB,
75 /*ANT_BC -> */ ANT_AC,
76 /*ANT_ABC -> */ ANT_ABC,
77 };
78
79 #define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np) \
80 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
81 IWL_RATE_SISO_##s##M_PLCP, \
82 IWL_RATE_MIMO2_##s##M_PLCP,\
83 IWL_RATE_MIMO3_##s##M_PLCP,\
84 IWL_RATE_##r##M_IEEE, \
85 IWL_RATE_##ip##M_INDEX, \
86 IWL_RATE_##in##M_INDEX, \
87 IWL_RATE_##rp##M_INDEX, \
88 IWL_RATE_##rn##M_INDEX, \
89 IWL_RATE_##pp##M_INDEX, \
90 IWL_RATE_##np##M_INDEX }
91
92 /*
93 * Parameter order:
94 * rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
95 *
96 * If there isn't a valid next or previous rate then INV is used which
97 * maps to IWL_RATE_INVALID
98 *
99 */
100 const struct iwl_rate_info iwl_rates[IWL_RATE_COUNT] = {
101 IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2), /* 1mbps */
102 IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5), /* 2mbps */
103 IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11), /*5.5mbps */
104 IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18), /* 11mbps */
105 IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11), /* 6mbps */
106 IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11), /* 9mbps */
107 IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18), /* 12mbps */
108 IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24), /* 18mbps */
109 IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36), /* 24mbps */
110 IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48), /* 36mbps */
111 IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54), /* 48mbps */
112 IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
113 IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
114 /* FIXME:RS: ^^ should be INV (legacy) */
115 };
116
117 static inline u8 rs_extract_rate(u32 rate_n_flags)
118 {
119 return (u8)(rate_n_flags & RATE_MCS_RATE_MSK);
120 }
121
122 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
123 {
124 int idx = 0;
125
126 /* HT rate format */
127 if (rate_n_flags & RATE_MCS_HT_MSK) {
128 idx = rs_extract_rate(rate_n_flags);
129
130 if (idx >= IWL_RATE_MIMO3_6M_PLCP)
131 idx = idx - IWL_RATE_MIMO3_6M_PLCP;
132 else if (idx >= IWL_RATE_MIMO2_6M_PLCP)
133 idx = idx - IWL_RATE_MIMO2_6M_PLCP;
134
135 idx += IWL_FIRST_OFDM_RATE;
136 /* skip 9M not supported in ht*/
137 if (idx >= IWL_RATE_9M_INDEX)
138 idx += 1;
139 if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE))
140 return idx;
141
142 /* legacy rate format, search for match in table */
143 } else {
144 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
145 if (iwl_rates[idx].plcp ==
146 rs_extract_rate(rate_n_flags))
147 return idx;
148 }
149
150 return -1;
151 }
152
153 static void rs_rate_scale_perform(struct iwl_priv *priv,
154 struct sk_buff *skb,
155 struct ieee80211_sta *sta,
156 struct iwl_lq_sta *lq_sta);
157 static void rs_fill_link_cmd(struct iwl_priv *priv,
158 struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
159 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
160
161
162 #ifdef CONFIG_MAC80211_DEBUGFS
163 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
164 u32 *rate_n_flags, int index);
165 #else
166 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
167 u32 *rate_n_flags, int index)
168 {}
169 #endif
170
171 /**
172 * The following tables contain the expected throughput metrics for all rates
173 *
174 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
175 *
176 * where invalid entries are zeros.
177 *
178 * CCK rates are only valid in legacy table and will only be used in G
179 * (2.4 GHz) band.
180 */
181
182 static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
183 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
184 };
185
186 static s32 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
187 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202}, /* Norm */
188 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210}, /* SGI */
189 {0, 0, 0, 0, 47, 0, 91, 133, 171, 242, 305, 334, 362}, /* AGG */
190 {0, 0, 0, 0, 52, 0, 101, 145, 187, 264, 330, 361, 390}, /* AGG+SGI */
191 };
192
193 static s32 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
194 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
195 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
196 {0, 0, 0, 0, 94, 0, 177, 249, 313, 423, 512, 550, 586}, /* AGG */
197 {0, 0, 0, 0, 104, 0, 193, 270, 338, 454, 545, 584, 620}, /* AGG+SGI */
198 };
199
200 static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
201 {0, 0, 0, 0, 74, 0, 123, 155, 179, 214, 236, 244, 251}, /* Norm */
202 {0, 0, 0, 0, 81, 0, 131, 164, 188, 223, 243, 251, 257}, /* SGI */
203 {0, 0, 0, 0, 89, 0, 167, 235, 296, 402, 488, 526, 560}, /* AGG */
204 {0, 0, 0, 0, 97, 0, 182, 255, 320, 431, 520, 558, 593}, /* AGG+SGI*/
205 };
206
207 static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
208 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
209 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
210 {0, 0, 0, 0, 171, 0, 305, 410, 496, 634, 731, 771, 805}, /* AGG */
211 {0, 0, 0, 0, 186, 0, 329, 439, 527, 667, 764, 803, 838}, /* AGG+SGI */
212 };
213
214 static s32 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = {
215 {0, 0, 0, 0, 99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */
216 {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */
217 {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */
218 {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */
219 };
220
221 static s32 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = {
222 {0, 0, 0, 0, 152, 0, 211, 239, 255, 279, 290, 294, 297}, /* Norm */
223 {0, 0, 0, 0, 160, 0, 219, 245, 261, 284, 294, 297, 300}, /* SGI */
224 {0, 0, 0, 0, 254, 0, 443, 584, 695, 868, 984, 1030, 1070}, /* AGG */
225 {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */
226 };
227
228 /* mbps, mcs */
229 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
230 { "1", "BPSK DSSS"},
231 { "2", "QPSK DSSS"},
232 {"5.5", "BPSK CCK"},
233 { "11", "QPSK CCK"},
234 { "6", "BPSK 1/2"},
235 { "9", "BPSK 1/2"},
236 { "12", "QPSK 1/2"},
237 { "18", "QPSK 3/4"},
238 { "24", "16QAM 1/2"},
239 { "36", "16QAM 3/4"},
240 { "48", "64QAM 2/3"},
241 { "54", "64QAM 3/4"},
242 { "60", "64QAM 5/6"},
243 };
244
245 #define MCS_INDEX_PER_STREAM (8)
246
247 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
248 {
249 window->data = 0;
250 window->success_counter = 0;
251 window->success_ratio = IWL_INVALID_VALUE;
252 window->counter = 0;
253 window->average_tpt = IWL_INVALID_VALUE;
254 window->stamp = 0;
255 }
256
257 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
258 {
259 return (ant_type & valid_antenna) == ant_type;
260 }
261
262 /*
263 * removes the old data from the statistics. All data that is older than
264 * TID_MAX_TIME_DIFF, will be deleted.
265 */
266 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
267 {
268 /* The oldest age we want to keep */
269 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
270
271 while (tl->queue_count &&
272 (tl->time_stamp < oldest_time)) {
273 tl->total -= tl->packet_count[tl->head];
274 tl->packet_count[tl->head] = 0;
275 tl->time_stamp += TID_QUEUE_CELL_SPACING;
276 tl->queue_count--;
277 tl->head++;
278 if (tl->head >= TID_QUEUE_MAX_SIZE)
279 tl->head = 0;
280 }
281 }
282
283 /*
284 * increment traffic load value for tid and also remove
285 * any old values if passed the certain time period
286 */
287 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
288 struct ieee80211_hdr *hdr)
289 {
290 u32 curr_time = jiffies_to_msecs(jiffies);
291 u32 time_diff;
292 s32 index;
293 struct iwl_traffic_load *tl = NULL;
294 u8 tid;
295
296 if (ieee80211_is_data_qos(hdr->frame_control)) {
297 u8 *qc = ieee80211_get_qos_ctl(hdr);
298 tid = qc[0] & 0xf;
299 } else
300 return MAX_TID_COUNT;
301
302 if (unlikely(tid >= TID_MAX_LOAD_COUNT))
303 return MAX_TID_COUNT;
304
305 tl = &lq_data->load[tid];
306
307 curr_time -= curr_time % TID_ROUND_VALUE;
308
309 /* Happens only for the first packet. Initialize the data */
310 if (!(tl->queue_count)) {
311 tl->total = 1;
312 tl->time_stamp = curr_time;
313 tl->queue_count = 1;
314 tl->head = 0;
315 tl->packet_count[0] = 1;
316 return MAX_TID_COUNT;
317 }
318
319 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
320 index = time_diff / TID_QUEUE_CELL_SPACING;
321
322 /* The history is too long: remove data that is older than */
323 /* TID_MAX_TIME_DIFF */
324 if (index >= TID_QUEUE_MAX_SIZE)
325 rs_tl_rm_old_stats(tl, curr_time);
326
327 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
328 tl->packet_count[index] = tl->packet_count[index] + 1;
329 tl->total = tl->total + 1;
330
331 if ((index + 1) > tl->queue_count)
332 tl->queue_count = index + 1;
333
334 return tid;
335 }
336
337 #ifdef CONFIG_MAC80211_DEBUGFS
338 /**
339 * Program the device to use fixed rate for frame transmit
340 * This is for debugging/testing only
341 * once the device start use fixed rate, we need to reload the module
342 * to being back the normal operation.
343 */
344 static void rs_program_fix_rate(struct iwl_priv *priv,
345 struct iwl_lq_sta *lq_sta)
346 {
347 struct iwl_station_priv *sta_priv =
348 container_of(lq_sta, struct iwl_station_priv, lq_sta);
349 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
350
351 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
352 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
353 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
354 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
355
356 #ifdef CONFIG_IWLWIFI_DEVICE_SVTOOL
357 /* testmode has higher priority to overwirte the fixed rate */
358 if (priv->tm_fixed_rate)
359 lq_sta->dbg_fixed_rate = priv->tm_fixed_rate;
360 #endif
361
362 IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
363 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
364
365 if (lq_sta->dbg_fixed_rate) {
366 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
367 iwl_send_lq_cmd(lq_sta->drv, ctx, &lq_sta->lq, CMD_ASYNC,
368 false);
369 }
370 }
371 #endif
372
373 /*
374 get the traffic load value for tid
375 */
376 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
377 {
378 u32 curr_time = jiffies_to_msecs(jiffies);
379 u32 time_diff;
380 s32 index;
381 struct iwl_traffic_load *tl = NULL;
382
383 if (tid >= TID_MAX_LOAD_COUNT)
384 return 0;
385
386 tl = &(lq_data->load[tid]);
387
388 curr_time -= curr_time % TID_ROUND_VALUE;
389
390 if (!(tl->queue_count))
391 return 0;
392
393 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
394 index = time_diff / TID_QUEUE_CELL_SPACING;
395
396 /* The history is too long: remove data that is older than */
397 /* TID_MAX_TIME_DIFF */
398 if (index >= TID_QUEUE_MAX_SIZE)
399 rs_tl_rm_old_stats(tl, curr_time);
400
401 return tl->total;
402 }
403
404 static int rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
405 struct iwl_lq_sta *lq_data, u8 tid,
406 struct ieee80211_sta *sta)
407 {
408 int ret = -EAGAIN;
409 u32 load;
410
411 /*
412 * Don't create TX aggregation sessions when in high
413 * BT traffic, as they would just be disrupted by BT.
414 */
415 if (priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) {
416 IWL_ERR(priv, "BT traffic (%d), no aggregation allowed\n",
417 priv->bt_traffic_load);
418 return ret;
419 }
420
421 load = rs_tl_get_load(lq_data, tid);
422
423 if (load > IWL_AGG_LOAD_THRESHOLD) {
424 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
425 sta->addr, tid);
426 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
427 if (ret == -EAGAIN) {
428 /*
429 * driver and mac80211 is out of sync
430 * this might be cause by reloading firmware
431 * stop the tx ba session here
432 */
433 IWL_ERR(priv, "Fail start Tx agg on tid: %d\n",
434 tid);
435 ieee80211_stop_tx_ba_session(sta, tid);
436 }
437 } else {
438 IWL_DEBUG_HT(priv, "Aggregation not enabled for tid %d "
439 "because load = %u\n", tid, load);
440 }
441 return ret;
442 }
443
444 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
445 struct iwl_lq_sta *lq_data,
446 struct ieee80211_sta *sta)
447 {
448 if (tid < TID_MAX_LOAD_COUNT)
449 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
450 else
451 IWL_ERR(priv, "tid exceeds max load count: %d/%d\n",
452 tid, TID_MAX_LOAD_COUNT);
453 }
454
455 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
456 {
457 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
458 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
459 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
460 }
461
462 /*
463 * Static function to get the expected throughput from an iwl_scale_tbl_info
464 * that wraps a NULL pointer check
465 */
466 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
467 {
468 if (tbl->expected_tpt)
469 return tbl->expected_tpt[rs_index];
470 return 0;
471 }
472
473 /**
474 * rs_collect_tx_data - Update the success/failure sliding window
475 *
476 * We keep a sliding window of the last 62 packets transmitted
477 * at this rate. window->data contains the bitmask of successful
478 * packets.
479 */
480 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
481 int scale_index, int attempts, int successes)
482 {
483 struct iwl_rate_scale_data *window = NULL;
484 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
485 s32 fail_count, tpt;
486
487 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
488 return -EINVAL;
489
490 /* Select window for current tx bit rate */
491 window = &(tbl->win[scale_index]);
492
493 /* Get expected throughput */
494 tpt = get_expected_tpt(tbl, scale_index);
495
496 /*
497 * Keep track of only the latest 62 tx frame attempts in this rate's
498 * history window; anything older isn't really relevant any more.
499 * If we have filled up the sliding window, drop the oldest attempt;
500 * if the oldest attempt (highest bit in bitmap) shows "success",
501 * subtract "1" from the success counter (this is the main reason
502 * we keep these bitmaps!).
503 */
504 while (attempts > 0) {
505 if (window->counter >= IWL_RATE_MAX_WINDOW) {
506
507 /* remove earliest */
508 window->counter = IWL_RATE_MAX_WINDOW - 1;
509
510 if (window->data & mask) {
511 window->data &= ~mask;
512 window->success_counter--;
513 }
514 }
515
516 /* Increment frames-attempted counter */
517 window->counter++;
518
519 /* Shift bitmap by one frame to throw away oldest history */
520 window->data <<= 1;
521
522 /* Mark the most recent #successes attempts as successful */
523 if (successes > 0) {
524 window->success_counter++;
525 window->data |= 0x1;
526 successes--;
527 }
528
529 attempts--;
530 }
531
532 /* Calculate current success ratio, avoid divide-by-0! */
533 if (window->counter > 0)
534 window->success_ratio = 128 * (100 * window->success_counter)
535 / window->counter;
536 else
537 window->success_ratio = IWL_INVALID_VALUE;
538
539 fail_count = window->counter - window->success_counter;
540
541 /* Calculate average throughput, if we have enough history. */
542 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
543 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
544 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
545 else
546 window->average_tpt = IWL_INVALID_VALUE;
547
548 /* Tag this window as having been updated */
549 window->stamp = jiffies;
550
551 return 0;
552 }
553
554 /*
555 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
556 */
557 /* FIXME:RS:remove this function and put the flags statically in the table */
558 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
559 struct iwl_scale_tbl_info *tbl,
560 int index, u8 use_green)
561 {
562 u32 rate_n_flags = 0;
563
564 if (is_legacy(tbl->lq_type)) {
565 rate_n_flags = iwl_rates[index].plcp;
566 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
567 rate_n_flags |= RATE_MCS_CCK_MSK;
568
569 } else if (is_Ht(tbl->lq_type)) {
570 if (index > IWL_LAST_OFDM_RATE) {
571 IWL_ERR(priv, "Invalid HT rate index %d\n", index);
572 index = IWL_LAST_OFDM_RATE;
573 }
574 rate_n_flags = RATE_MCS_HT_MSK;
575
576 if (is_siso(tbl->lq_type))
577 rate_n_flags |= iwl_rates[index].plcp_siso;
578 else if (is_mimo2(tbl->lq_type))
579 rate_n_flags |= iwl_rates[index].plcp_mimo2;
580 else
581 rate_n_flags |= iwl_rates[index].plcp_mimo3;
582 } else {
583 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
584 }
585
586 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
587 RATE_MCS_ANT_ABC_MSK);
588
589 if (is_Ht(tbl->lq_type)) {
590 if (tbl->is_ht40) {
591 if (tbl->is_dup)
592 rate_n_flags |= RATE_MCS_DUP_MSK;
593 else
594 rate_n_flags |= RATE_MCS_HT40_MSK;
595 }
596 if (tbl->is_SGI)
597 rate_n_flags |= RATE_MCS_SGI_MSK;
598
599 if (use_green) {
600 rate_n_flags |= RATE_MCS_GF_MSK;
601 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
602 rate_n_flags &= ~RATE_MCS_SGI_MSK;
603 IWL_ERR(priv, "GF was set with SGI:SISO\n");
604 }
605 }
606 }
607 return rate_n_flags;
608 }
609
610 /*
611 * Interpret uCode API's rate_n_flags format,
612 * fill "search" or "active" tx mode table.
613 */
614 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
615 enum ieee80211_band band,
616 struct iwl_scale_tbl_info *tbl,
617 int *rate_idx)
618 {
619 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
620 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
621 u8 mcs;
622
623 memset(tbl, 0, sizeof(struct iwl_scale_tbl_info));
624 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
625
626 if (*rate_idx == IWL_RATE_INVALID) {
627 *rate_idx = -1;
628 return -EINVAL;
629 }
630 tbl->is_SGI = 0; /* default legacy setup */
631 tbl->is_ht40 = 0;
632 tbl->is_dup = 0;
633 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
634 tbl->lq_type = LQ_NONE;
635 tbl->max_search = IWL_MAX_SEARCH;
636
637 /* legacy rate format */
638 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
639 if (num_of_ant == 1) {
640 if (band == IEEE80211_BAND_5GHZ)
641 tbl->lq_type = LQ_A;
642 else
643 tbl->lq_type = LQ_G;
644 }
645 /* HT rate format */
646 } else {
647 if (rate_n_flags & RATE_MCS_SGI_MSK)
648 tbl->is_SGI = 1;
649
650 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
651 (rate_n_flags & RATE_MCS_DUP_MSK))
652 tbl->is_ht40 = 1;
653
654 if (rate_n_flags & RATE_MCS_DUP_MSK)
655 tbl->is_dup = 1;
656
657 mcs = rs_extract_rate(rate_n_flags);
658
659 /* SISO */
660 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
661 if (num_of_ant == 1)
662 tbl->lq_type = LQ_SISO; /*else NONE*/
663 /* MIMO2 */
664 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
665 if (num_of_ant == 2)
666 tbl->lq_type = LQ_MIMO2;
667 /* MIMO3 */
668 } else {
669 if (num_of_ant == 3) {
670 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
671 tbl->lq_type = LQ_MIMO3;
672 }
673 }
674 }
675 return 0;
676 }
677
678 /* switch to another antenna/antennas and return 1 */
679 /* if no other valid antenna found, return 0 */
680 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
681 struct iwl_scale_tbl_info *tbl)
682 {
683 u8 new_ant_type;
684
685 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
686 return 0;
687
688 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
689 return 0;
690
691 new_ant_type = ant_toggle_lookup[tbl->ant_type];
692
693 while ((new_ant_type != tbl->ant_type) &&
694 !rs_is_valid_ant(valid_ant, new_ant_type))
695 new_ant_type = ant_toggle_lookup[new_ant_type];
696
697 if (new_ant_type == tbl->ant_type)
698 return 0;
699
700 tbl->ant_type = new_ant_type;
701 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
702 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
703 return 1;
704 }
705
706 /**
707 * Green-field mode is valid if the station supports it and
708 * there are no non-GF stations present in the BSS.
709 */
710 static bool rs_use_green(struct ieee80211_sta *sta)
711 {
712 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
713 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
714
715 return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
716 !(ctx->ht.non_gf_sta_present);
717 }
718
719 /**
720 * rs_get_supported_rates - get the available rates
721 *
722 * if management frame or broadcast frame only return
723 * basic available rates.
724 *
725 */
726 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
727 struct ieee80211_hdr *hdr,
728 enum iwl_table_type rate_type)
729 {
730 if (is_legacy(rate_type)) {
731 return lq_sta->active_legacy_rate;
732 } else {
733 if (is_siso(rate_type))
734 return lq_sta->active_siso_rate;
735 else if (is_mimo2(rate_type))
736 return lq_sta->active_mimo2_rate;
737 else
738 return lq_sta->active_mimo3_rate;
739 }
740 }
741
742 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
743 int rate_type)
744 {
745 u8 high = IWL_RATE_INVALID;
746 u8 low = IWL_RATE_INVALID;
747
748 /* 802.11A or ht walks to the next literal adjacent rate in
749 * the rate table */
750 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
751 int i;
752 u32 mask;
753
754 /* Find the previous rate that is in the rate mask */
755 i = index - 1;
756 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
757 if (rate_mask & mask) {
758 low = i;
759 break;
760 }
761 }
762
763 /* Find the next rate that is in the rate mask */
764 i = index + 1;
765 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
766 if (rate_mask & mask) {
767 high = i;
768 break;
769 }
770 }
771
772 return (high << 8) | low;
773 }
774
775 low = index;
776 while (low != IWL_RATE_INVALID) {
777 low = iwl_rates[low].prev_rs;
778 if (low == IWL_RATE_INVALID)
779 break;
780 if (rate_mask & (1 << low))
781 break;
782 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
783 }
784
785 high = index;
786 while (high != IWL_RATE_INVALID) {
787 high = iwl_rates[high].next_rs;
788 if (high == IWL_RATE_INVALID)
789 break;
790 if (rate_mask & (1 << high))
791 break;
792 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
793 }
794
795 return (high << 8) | low;
796 }
797
798 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
799 struct iwl_scale_tbl_info *tbl,
800 u8 scale_index, u8 ht_possible)
801 {
802 s32 low;
803 u16 rate_mask;
804 u16 high_low;
805 u8 switch_to_legacy = 0;
806 u8 is_green = lq_sta->is_green;
807 struct iwl_priv *priv = lq_sta->drv;
808
809 /* check if we need to switch from HT to legacy rates.
810 * assumption is that mandatory rates (1Mbps or 6Mbps)
811 * are always supported (spec demand) */
812 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
813 switch_to_legacy = 1;
814 scale_index = rs_ht_to_legacy[scale_index];
815 if (lq_sta->band == IEEE80211_BAND_5GHZ)
816 tbl->lq_type = LQ_A;
817 else
818 tbl->lq_type = LQ_G;
819
820 if (num_of_ant(tbl->ant_type) > 1)
821 tbl->ant_type =
822 first_antenna(priv->hw_params.valid_tx_ant);
823
824 tbl->is_ht40 = 0;
825 tbl->is_SGI = 0;
826 tbl->max_search = IWL_MAX_SEARCH;
827 }
828
829 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
830
831 /* Mask with station rate restriction */
832 if (is_legacy(tbl->lq_type)) {
833 /* supp_rates has no CCK bits in A mode */
834 if (lq_sta->band == IEEE80211_BAND_5GHZ)
835 rate_mask = (u16)(rate_mask &
836 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
837 else
838 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
839 }
840
841 /* If we switched from HT to legacy, check current rate */
842 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
843 low = scale_index;
844 goto out;
845 }
846
847 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
848 tbl->lq_type);
849 low = high_low & 0xff;
850
851 if (low == IWL_RATE_INVALID)
852 low = scale_index;
853
854 out:
855 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
856 }
857
858 /*
859 * Simple function to compare two rate scale table types
860 */
861 static bool table_type_matches(struct iwl_scale_tbl_info *a,
862 struct iwl_scale_tbl_info *b)
863 {
864 return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
865 (a->is_SGI == b->is_SGI);
866 }
867
868 static void rs_bt_update_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
869 struct iwl_lq_sta *lq_sta)
870 {
871 struct iwl_scale_tbl_info *tbl;
872 bool full_concurrent = priv->bt_full_concurrent;
873 unsigned long flags;
874
875 if (priv->bt_ant_couple_ok) {
876 /*
877 * Is there a need to switch between
878 * full concurrency and 3-wire?
879 */
880 spin_lock_irqsave(&priv->lock, flags);
881 if (priv->bt_ci_compliance && priv->bt_ant_couple_ok)
882 full_concurrent = true;
883 else
884 full_concurrent = false;
885 spin_unlock_irqrestore(&priv->lock, flags);
886 }
887 if ((priv->bt_traffic_load != priv->last_bt_traffic_load) ||
888 (priv->bt_full_concurrent != full_concurrent)) {
889 priv->bt_full_concurrent = full_concurrent;
890
891 /* Update uCode's rate table. */
892 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
893 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
894 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
895
896 queue_work(priv->workqueue, &priv->bt_full_concurrency);
897 }
898 }
899
900 /*
901 * mac80211 sends us Tx status
902 */
903 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
904 struct ieee80211_sta *sta, void *priv_sta,
905 struct sk_buff *skb)
906 {
907 int legacy_success;
908 int retries;
909 int rs_index, mac_index, i;
910 struct iwl_lq_sta *lq_sta = priv_sta;
911 struct iwl_link_quality_cmd *table;
912 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
913 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
914 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
915 enum mac80211_rate_control_flags mac_flags;
916 u32 tx_rate;
917 struct iwl_scale_tbl_info tbl_type;
918 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
919 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
920 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
921
922 IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
923
924 /* Treat uninitialized rate scaling data same as non-existing. */
925 if (!lq_sta) {
926 IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n");
927 return;
928 } else if (!lq_sta->drv) {
929 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
930 return;
931 }
932
933 if (!ieee80211_is_data(hdr->frame_control) ||
934 info->flags & IEEE80211_TX_CTL_NO_ACK)
935 return;
936
937 /* This packet was aggregated but doesn't carry status info */
938 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
939 !(info->flags & IEEE80211_TX_STAT_AMPDU))
940 return;
941
942 /*
943 * Ignore this Tx frame response if its initial rate doesn't match
944 * that of latest Link Quality command. There may be stragglers
945 * from a previous Link Quality command, but we're no longer interested
946 * in those; they're either from the "active" mode while we're trying
947 * to check "search" mode, or a prior "search" mode after we've moved
948 * to a new "search" mode (which might become the new "active" mode).
949 */
950 table = &lq_sta->lq;
951 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
952 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
953 if (priv->band == IEEE80211_BAND_5GHZ)
954 rs_index -= IWL_FIRST_OFDM_RATE;
955 mac_flags = info->status.rates[0].flags;
956 mac_index = info->status.rates[0].idx;
957 /* For HT packets, map MCS to PLCP */
958 if (mac_flags & IEEE80211_TX_RC_MCS) {
959 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
960 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
961 mac_index++;
962 /*
963 * mac80211 HT index is always zero-indexed; we need to move
964 * HT OFDM rates after CCK rates in 2.4 GHz band
965 */
966 if (priv->band == IEEE80211_BAND_2GHZ)
967 mac_index += IWL_FIRST_OFDM_RATE;
968 }
969 /* Here we actually compare this rate to the latest LQ command */
970 if ((mac_index < 0) ||
971 (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
972 (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
973 (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
974 (tbl_type.ant_type != info->antenna_sel_tx) ||
975 (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
976 (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
977 (rs_index != mac_index)) {
978 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate);
979 /*
980 * Since rates mis-match, the last LQ command may have failed.
981 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
982 * ... driver.
983 */
984 lq_sta->missed_rate_counter++;
985 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
986 lq_sta->missed_rate_counter = 0;
987 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
988 }
989 /* Regardless, ignore this status info for outdated rate */
990 return;
991 } else
992 /* Rate did match, so reset the missed_rate_counter */
993 lq_sta->missed_rate_counter = 0;
994
995 /* Figure out if rate scale algorithm is in active or search table */
996 if (table_type_matches(&tbl_type,
997 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
998 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
999 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1000 } else if (table_type_matches(&tbl_type,
1001 &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
1002 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1003 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1004 } else {
1005 IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n");
1006 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1007 IWL_DEBUG_RATE(priv, "active- lq:%x, ant:%x, SGI:%d\n",
1008 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
1009 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1010 IWL_DEBUG_RATE(priv, "search- lq:%x, ant:%x, SGI:%d\n",
1011 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
1012 IWL_DEBUG_RATE(priv, "actual- lq:%x, ant:%x, SGI:%d\n",
1013 tbl_type.lq_type, tbl_type.ant_type, tbl_type.is_SGI);
1014 /*
1015 * no matching table found, let's by-pass the data collection
1016 * and continue to perform rate scale to find the rate table
1017 */
1018 rs_stay_in_table(lq_sta, true);
1019 goto done;
1020 }
1021
1022 /*
1023 * Updating the frame history depends on whether packets were
1024 * aggregated.
1025 *
1026 * For aggregation, all packets were transmitted at the same rate, the
1027 * first index into rate scale table.
1028 */
1029 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1030 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
1031 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
1032 &rs_index);
1033 rs_collect_tx_data(curr_tbl, rs_index,
1034 info->status.ampdu_len,
1035 info->status.ampdu_ack_len);
1036
1037 /* Update success/fail counts if not searching for new mode */
1038 if (lq_sta->stay_in_tbl) {
1039 lq_sta->total_success += info->status.ampdu_ack_len;
1040 lq_sta->total_failed += (info->status.ampdu_len -
1041 info->status.ampdu_ack_len);
1042 }
1043 } else {
1044 /*
1045 * For legacy, update frame history with for each Tx retry.
1046 */
1047 retries = info->status.rates[0].count - 1;
1048 /* HW doesn't send more than 15 retries */
1049 retries = min(retries, 15);
1050
1051 /* The last transmission may have been successful */
1052 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1053 /* Collect data for each rate used during failed TX attempts */
1054 for (i = 0; i <= retries; ++i) {
1055 tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
1056 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
1057 &tbl_type, &rs_index);
1058 /*
1059 * Only collect stats if retried rate is in the same RS
1060 * table as active/search.
1061 */
1062 if (table_type_matches(&tbl_type, curr_tbl))
1063 tmp_tbl = curr_tbl;
1064 else if (table_type_matches(&tbl_type, other_tbl))
1065 tmp_tbl = other_tbl;
1066 else
1067 continue;
1068 rs_collect_tx_data(tmp_tbl, rs_index, 1,
1069 i < retries ? 0 : legacy_success);
1070 }
1071
1072 /* Update success/fail counts if not searching for new mode */
1073 if (lq_sta->stay_in_tbl) {
1074 lq_sta->total_success += legacy_success;
1075 lq_sta->total_failed += retries + (1 - legacy_success);
1076 }
1077 }
1078 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1079 lq_sta->last_rate_n_flags = tx_rate;
1080 done:
1081 /* See if there's a better rate or modulation mode to try. */
1082 if (sta && sta->supp_rates[sband->band])
1083 rs_rate_scale_perform(priv, skb, sta, lq_sta);
1084
1085 #if defined(CONFIG_MAC80211_DEBUGFS) && defined(CONFIG_IWLWIFI_DEVICE_SVTOOL)
1086 if ((priv->tm_fixed_rate) &&
1087 (priv->tm_fixed_rate != lq_sta->dbg_fixed_rate))
1088 rs_program_fix_rate(priv, lq_sta);
1089 #endif
1090 if (priv->cfg->bt_params && priv->cfg->bt_params->advanced_bt_coexist)
1091 rs_bt_update_lq(priv, ctx, lq_sta);
1092 }
1093
1094 /*
1095 * Begin a period of staying with a selected modulation mode.
1096 * Set "stay_in_tbl" flag to prevent any mode switches.
1097 * Set frame tx success limits according to legacy vs. high-throughput,
1098 * and reset overall (spanning all rates) tx success history statistics.
1099 * These control how long we stay using same modulation mode before
1100 * searching for a new mode.
1101 */
1102 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
1103 struct iwl_lq_sta *lq_sta)
1104 {
1105 IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
1106 lq_sta->stay_in_tbl = 1; /* only place this gets set */
1107 if (is_legacy) {
1108 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1109 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1110 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1111 } else {
1112 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1113 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1114 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1115 }
1116 lq_sta->table_count = 0;
1117 lq_sta->total_failed = 0;
1118 lq_sta->total_success = 0;
1119 lq_sta->flush_timer = jiffies;
1120 lq_sta->action_counter = 0;
1121 }
1122
1123 /*
1124 * Find correct throughput table for given mode of modulation
1125 */
1126 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1127 struct iwl_scale_tbl_info *tbl)
1128 {
1129 /* Used to choose among HT tables */
1130 s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1131
1132 /* Check for invalid LQ type */
1133 if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1134 tbl->expected_tpt = expected_tpt_legacy;
1135 return;
1136 }
1137
1138 /* Legacy rates have only one table */
1139 if (is_legacy(tbl->lq_type)) {
1140 tbl->expected_tpt = expected_tpt_legacy;
1141 return;
1142 }
1143
1144 /* Choose among many HT tables depending on number of streams
1145 * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
1146 * status */
1147 if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1148 ht_tbl_pointer = expected_tpt_siso20MHz;
1149 else if (is_siso(tbl->lq_type))
1150 ht_tbl_pointer = expected_tpt_siso40MHz;
1151 else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1152 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1153 else if (is_mimo2(tbl->lq_type))
1154 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1155 else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1156 ht_tbl_pointer = expected_tpt_mimo3_20MHz;
1157 else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
1158 ht_tbl_pointer = expected_tpt_mimo3_40MHz;
1159
1160 if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */
1161 tbl->expected_tpt = ht_tbl_pointer[0];
1162 else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */
1163 tbl->expected_tpt = ht_tbl_pointer[1];
1164 else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */
1165 tbl->expected_tpt = ht_tbl_pointer[2];
1166 else /* AGG+SGI */
1167 tbl->expected_tpt = ht_tbl_pointer[3];
1168 }
1169
1170 /*
1171 * Find starting rate for new "search" high-throughput mode of modulation.
1172 * Goal is to find lowest expected rate (under perfect conditions) that is
1173 * above the current measured throughput of "active" mode, to give new mode
1174 * a fair chance to prove itself without too many challenges.
1175 *
1176 * This gets called when transitioning to more aggressive modulation
1177 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1178 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1179 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1180 * bit rate will typically need to increase, but not if performance was bad.
1181 */
1182 static s32 rs_get_best_rate(struct iwl_priv *priv,
1183 struct iwl_lq_sta *lq_sta,
1184 struct iwl_scale_tbl_info *tbl, /* "search" */
1185 u16 rate_mask, s8 index)
1186 {
1187 /* "active" values */
1188 struct iwl_scale_tbl_info *active_tbl =
1189 &(lq_sta->lq_info[lq_sta->active_tbl]);
1190 s32 active_sr = active_tbl->win[index].success_ratio;
1191 s32 active_tpt = active_tbl->expected_tpt[index];
1192
1193 /* expected "search" throughput */
1194 s32 *tpt_tbl = tbl->expected_tpt;
1195
1196 s32 new_rate, high, low, start_hi;
1197 u16 high_low;
1198 s8 rate = index;
1199
1200 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1201
1202 for (; ;) {
1203 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1204 tbl->lq_type);
1205
1206 low = high_low & 0xff;
1207 high = (high_low >> 8) & 0xff;
1208
1209 /*
1210 * Lower the "search" bit rate, to give new "search" mode
1211 * approximately the same throughput as "active" if:
1212 *
1213 * 1) "Active" mode has been working modestly well (but not
1214 * great), and expected "search" throughput (under perfect
1215 * conditions) at candidate rate is above the actual
1216 * measured "active" throughput (but less than expected
1217 * "active" throughput under perfect conditions).
1218 * OR
1219 * 2) "Active" mode has been working perfectly or very well
1220 * and expected "search" throughput (under perfect
1221 * conditions) at candidate rate is above expected
1222 * "active" throughput (under perfect conditions).
1223 */
1224 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1225 ((active_sr > IWL_RATE_DECREASE_TH) &&
1226 (active_sr <= IWL_RATE_HIGH_TH) &&
1227 (tpt_tbl[rate] <= active_tpt))) ||
1228 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1229 (tpt_tbl[rate] > active_tpt))) {
1230
1231 /* (2nd or later pass)
1232 * If we've already tried to raise the rate, and are
1233 * now trying to lower it, use the higher rate. */
1234 if (start_hi != IWL_RATE_INVALID) {
1235 new_rate = start_hi;
1236 break;
1237 }
1238
1239 new_rate = rate;
1240
1241 /* Loop again with lower rate */
1242 if (low != IWL_RATE_INVALID)
1243 rate = low;
1244
1245 /* Lower rate not available, use the original */
1246 else
1247 break;
1248
1249 /* Else try to raise the "search" rate to match "active" */
1250 } else {
1251 /* (2nd or later pass)
1252 * If we've already tried to lower the rate, and are
1253 * now trying to raise it, use the lower rate. */
1254 if (new_rate != IWL_RATE_INVALID)
1255 break;
1256
1257 /* Loop again with higher rate */
1258 else if (high != IWL_RATE_INVALID) {
1259 start_hi = high;
1260 rate = high;
1261
1262 /* Higher rate not available, use the original */
1263 } else {
1264 new_rate = rate;
1265 break;
1266 }
1267 }
1268 }
1269
1270 return new_rate;
1271 }
1272
1273 /*
1274 * Set up search table for MIMO2
1275 */
1276 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1277 struct iwl_lq_sta *lq_sta,
1278 struct ieee80211_conf *conf,
1279 struct ieee80211_sta *sta,
1280 struct iwl_scale_tbl_info *tbl, int index)
1281 {
1282 u16 rate_mask;
1283 s32 rate;
1284 s8 is_green = lq_sta->is_green;
1285 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1286 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1287
1288 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1289 return -1;
1290
1291 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1292 == WLAN_HT_CAP_SM_PS_STATIC)
1293 return -1;
1294
1295 /* Need both Tx chains/antennas to support MIMO */
1296 if (priv->hw_params.tx_chains_num < 2)
1297 return -1;
1298
1299 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1300
1301 tbl->lq_type = LQ_MIMO2;
1302 tbl->is_dup = lq_sta->is_dup;
1303 tbl->action = 0;
1304 tbl->max_search = IWL_MAX_SEARCH;
1305 rate_mask = lq_sta->active_mimo2_rate;
1306
1307 if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1308 tbl->is_ht40 = 1;
1309 else
1310 tbl->is_ht40 = 0;
1311
1312 rs_set_expected_tpt_table(lq_sta, tbl);
1313
1314 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1315
1316 IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1317 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1318 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1319 rate, rate_mask);
1320 return -1;
1321 }
1322 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1323
1324 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1325 tbl->current_rate, is_green);
1326 return 0;
1327 }
1328
1329 /*
1330 * Set up search table for MIMO3
1331 */
1332 static int rs_switch_to_mimo3(struct iwl_priv *priv,
1333 struct iwl_lq_sta *lq_sta,
1334 struct ieee80211_conf *conf,
1335 struct ieee80211_sta *sta,
1336 struct iwl_scale_tbl_info *tbl, int index)
1337 {
1338 u16 rate_mask;
1339 s32 rate;
1340 s8 is_green = lq_sta->is_green;
1341 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1342 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1343
1344 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1345 return -1;
1346
1347 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1348 == WLAN_HT_CAP_SM_PS_STATIC)
1349 return -1;
1350
1351 /* Need both Tx chains/antennas to support MIMO */
1352 if (priv->hw_params.tx_chains_num < 3)
1353 return -1;
1354
1355 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1356
1357 tbl->lq_type = LQ_MIMO3;
1358 tbl->is_dup = lq_sta->is_dup;
1359 tbl->action = 0;
1360 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1361 rate_mask = lq_sta->active_mimo3_rate;
1362
1363 if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1364 tbl->is_ht40 = 1;
1365 else
1366 tbl->is_ht40 = 0;
1367
1368 rs_set_expected_tpt_table(lq_sta, tbl);
1369
1370 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1371
1372 IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1373 rate, rate_mask);
1374 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1375 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1376 rate, rate_mask);
1377 return -1;
1378 }
1379 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1380
1381 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1382 tbl->current_rate, is_green);
1383 return 0;
1384 }
1385
1386 /*
1387 * Set up search table for SISO
1388 */
1389 static int rs_switch_to_siso(struct iwl_priv *priv,
1390 struct iwl_lq_sta *lq_sta,
1391 struct ieee80211_conf *conf,
1392 struct ieee80211_sta *sta,
1393 struct iwl_scale_tbl_info *tbl, int index)
1394 {
1395 u16 rate_mask;
1396 u8 is_green = lq_sta->is_green;
1397 s32 rate;
1398 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1399 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1400
1401 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1402 return -1;
1403
1404 IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1405
1406 tbl->is_dup = lq_sta->is_dup;
1407 tbl->lq_type = LQ_SISO;
1408 tbl->action = 0;
1409 tbl->max_search = IWL_MAX_SEARCH;
1410 rate_mask = lq_sta->active_siso_rate;
1411
1412 if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1413 tbl->is_ht40 = 1;
1414 else
1415 tbl->is_ht40 = 0;
1416
1417 if (is_green)
1418 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1419
1420 rs_set_expected_tpt_table(lq_sta, tbl);
1421 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1422
1423 IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1424 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1425 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1426 rate, rate_mask);
1427 return -1;
1428 }
1429 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1430 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1431 tbl->current_rate, is_green);
1432 return 0;
1433 }
1434
1435 /*
1436 * Try to switch to new modulation mode from legacy
1437 */
1438 static int rs_move_legacy_other(struct iwl_priv *priv,
1439 struct iwl_lq_sta *lq_sta,
1440 struct ieee80211_conf *conf,
1441 struct ieee80211_sta *sta,
1442 int index)
1443 {
1444 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1445 struct iwl_scale_tbl_info *search_tbl =
1446 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1447 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1448 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1449 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1450 u8 start_action;
1451 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1452 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1453 int ret = 0;
1454 u8 update_search_tbl_counter = 0;
1455
1456 switch (priv->bt_traffic_load) {
1457 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1458 /* nothing */
1459 break;
1460 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1461 /* avoid antenna B unless MIMO */
1462 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1463 if (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2)
1464 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1465 break;
1466 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1467 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1468 /* avoid antenna B and MIMO */
1469 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1470 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2 &&
1471 tbl->action != IWL_LEGACY_SWITCH_SISO)
1472 tbl->action = IWL_LEGACY_SWITCH_SISO;
1473 break;
1474 default:
1475 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1476 break;
1477 }
1478
1479 if (!iwl_ht_enabled(priv))
1480 /* stay in Legacy */
1481 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1482 else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1483 tbl->action > IWL_LEGACY_SWITCH_SISO)
1484 tbl->action = IWL_LEGACY_SWITCH_SISO;
1485
1486 /* configure as 1x1 if bt full concurrency */
1487 if (priv->bt_full_concurrent) {
1488 if (!iwl_ht_enabled(priv))
1489 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1490 else if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1491 tbl->action = IWL_LEGACY_SWITCH_SISO;
1492 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1493 }
1494
1495 start_action = tbl->action;
1496 for (; ;) {
1497 lq_sta->action_counter++;
1498 switch (tbl->action) {
1499 case IWL_LEGACY_SWITCH_ANTENNA1:
1500 case IWL_LEGACY_SWITCH_ANTENNA2:
1501 IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1502
1503 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1504 tx_chains_num <= 1) ||
1505 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1506 tx_chains_num <= 2))
1507 break;
1508
1509 /* Don't change antenna if success has been great */
1510 if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1511 !priv->bt_full_concurrent &&
1512 priv->bt_traffic_load ==
1513 IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1514 break;
1515
1516 /* Set up search table to try other antenna */
1517 memcpy(search_tbl, tbl, sz);
1518
1519 if (rs_toggle_antenna(valid_tx_ant,
1520 &search_tbl->current_rate, search_tbl)) {
1521 update_search_tbl_counter = 1;
1522 rs_set_expected_tpt_table(lq_sta, search_tbl);
1523 goto out;
1524 }
1525 break;
1526 case IWL_LEGACY_SWITCH_SISO:
1527 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1528
1529 /* Set up search table to try SISO */
1530 memcpy(search_tbl, tbl, sz);
1531 search_tbl->is_SGI = 0;
1532 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1533 search_tbl, index);
1534 if (!ret) {
1535 lq_sta->action_counter = 0;
1536 goto out;
1537 }
1538
1539 break;
1540 case IWL_LEGACY_SWITCH_MIMO2_AB:
1541 case IWL_LEGACY_SWITCH_MIMO2_AC:
1542 case IWL_LEGACY_SWITCH_MIMO2_BC:
1543 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1544
1545 /* Set up search table to try MIMO */
1546 memcpy(search_tbl, tbl, sz);
1547 search_tbl->is_SGI = 0;
1548
1549 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1550 search_tbl->ant_type = ANT_AB;
1551 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1552 search_tbl->ant_type = ANT_AC;
1553 else
1554 search_tbl->ant_type = ANT_BC;
1555
1556 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1557 break;
1558
1559 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1560 search_tbl, index);
1561 if (!ret) {
1562 lq_sta->action_counter = 0;
1563 goto out;
1564 }
1565 break;
1566
1567 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1568 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1569
1570 /* Set up search table to try MIMO3 */
1571 memcpy(search_tbl, tbl, sz);
1572 search_tbl->is_SGI = 0;
1573
1574 search_tbl->ant_type = ANT_ABC;
1575
1576 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1577 break;
1578
1579 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1580 search_tbl, index);
1581 if (!ret) {
1582 lq_sta->action_counter = 0;
1583 goto out;
1584 }
1585 break;
1586 }
1587 tbl->action++;
1588 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1589 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1590
1591 if (tbl->action == start_action)
1592 break;
1593
1594 }
1595 search_tbl->lq_type = LQ_NONE;
1596 return 0;
1597
1598 out:
1599 lq_sta->search_better_tbl = 1;
1600 tbl->action++;
1601 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1602 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1603 if (update_search_tbl_counter)
1604 search_tbl->action = tbl->action;
1605 return 0;
1606
1607 }
1608
1609 /*
1610 * Try to switch to new modulation mode from SISO
1611 */
1612 static int rs_move_siso_to_other(struct iwl_priv *priv,
1613 struct iwl_lq_sta *lq_sta,
1614 struct ieee80211_conf *conf,
1615 struct ieee80211_sta *sta, int index)
1616 {
1617 u8 is_green = lq_sta->is_green;
1618 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1619 struct iwl_scale_tbl_info *search_tbl =
1620 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1621 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1622 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1623 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1624 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1625 u8 start_action;
1626 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1627 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1628 u8 update_search_tbl_counter = 0;
1629 int ret;
1630
1631 switch (priv->bt_traffic_load) {
1632 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1633 /* nothing */
1634 break;
1635 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1636 /* avoid antenna B unless MIMO */
1637 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1638 if (tbl->action == IWL_SISO_SWITCH_ANTENNA2)
1639 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1640 break;
1641 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1642 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1643 /* avoid antenna B and MIMO */
1644 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1645 if (tbl->action != IWL_SISO_SWITCH_ANTENNA1)
1646 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1647 break;
1648 default:
1649 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1650 break;
1651 }
1652
1653 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1654 tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1655 /* stay in SISO */
1656 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1657 }
1658
1659 /* configure as 1x1 if bt full concurrency */
1660 if (priv->bt_full_concurrent) {
1661 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1662 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1663 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1664 }
1665
1666 start_action = tbl->action;
1667 for (;;) {
1668 lq_sta->action_counter++;
1669 switch (tbl->action) {
1670 case IWL_SISO_SWITCH_ANTENNA1:
1671 case IWL_SISO_SWITCH_ANTENNA2:
1672 IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1673 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1674 tx_chains_num <= 1) ||
1675 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1676 tx_chains_num <= 2))
1677 break;
1678
1679 if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1680 !priv->bt_full_concurrent &&
1681 priv->bt_traffic_load ==
1682 IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1683 break;
1684
1685 memcpy(search_tbl, tbl, sz);
1686 if (rs_toggle_antenna(valid_tx_ant,
1687 &search_tbl->current_rate, search_tbl)) {
1688 update_search_tbl_counter = 1;
1689 goto out;
1690 }
1691 break;
1692 case IWL_SISO_SWITCH_MIMO2_AB:
1693 case IWL_SISO_SWITCH_MIMO2_AC:
1694 case IWL_SISO_SWITCH_MIMO2_BC:
1695 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1696 memcpy(search_tbl, tbl, sz);
1697 search_tbl->is_SGI = 0;
1698
1699 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1700 search_tbl->ant_type = ANT_AB;
1701 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1702 search_tbl->ant_type = ANT_AC;
1703 else
1704 search_tbl->ant_type = ANT_BC;
1705
1706 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1707 break;
1708
1709 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1710 search_tbl, index);
1711 if (!ret)
1712 goto out;
1713 break;
1714 case IWL_SISO_SWITCH_GI:
1715 if (!tbl->is_ht40 && !(ht_cap->cap &
1716 IEEE80211_HT_CAP_SGI_20))
1717 break;
1718 if (tbl->is_ht40 && !(ht_cap->cap &
1719 IEEE80211_HT_CAP_SGI_40))
1720 break;
1721
1722 IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1723
1724 memcpy(search_tbl, tbl, sz);
1725 if (is_green) {
1726 if (!tbl->is_SGI)
1727 break;
1728 else
1729 IWL_ERR(priv,
1730 "SGI was set in GF+SISO\n");
1731 }
1732 search_tbl->is_SGI = !tbl->is_SGI;
1733 rs_set_expected_tpt_table(lq_sta, search_tbl);
1734 if (tbl->is_SGI) {
1735 s32 tpt = lq_sta->last_tpt / 100;
1736 if (tpt >= search_tbl->expected_tpt[index])
1737 break;
1738 }
1739 search_tbl->current_rate =
1740 rate_n_flags_from_tbl(priv, search_tbl,
1741 index, is_green);
1742 update_search_tbl_counter = 1;
1743 goto out;
1744 case IWL_SISO_SWITCH_MIMO3_ABC:
1745 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1746 memcpy(search_tbl, tbl, sz);
1747 search_tbl->is_SGI = 0;
1748 search_tbl->ant_type = ANT_ABC;
1749
1750 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1751 break;
1752
1753 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1754 search_tbl, index);
1755 if (!ret)
1756 goto out;
1757 break;
1758 }
1759 tbl->action++;
1760 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1761 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1762
1763 if (tbl->action == start_action)
1764 break;
1765 }
1766 search_tbl->lq_type = LQ_NONE;
1767 return 0;
1768
1769 out:
1770 lq_sta->search_better_tbl = 1;
1771 tbl->action++;
1772 if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1773 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1774 if (update_search_tbl_counter)
1775 search_tbl->action = tbl->action;
1776
1777 return 0;
1778 }
1779
1780 /*
1781 * Try to switch to new modulation mode from MIMO2
1782 */
1783 static int rs_move_mimo2_to_other(struct iwl_priv *priv,
1784 struct iwl_lq_sta *lq_sta,
1785 struct ieee80211_conf *conf,
1786 struct ieee80211_sta *sta, int index)
1787 {
1788 s8 is_green = lq_sta->is_green;
1789 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1790 struct iwl_scale_tbl_info *search_tbl =
1791 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1792 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1793 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1794 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1795 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1796 u8 start_action;
1797 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1798 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1799 u8 update_search_tbl_counter = 0;
1800 int ret;
1801
1802 switch (priv->bt_traffic_load) {
1803 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1804 /* nothing */
1805 break;
1806 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1807 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1808 /* avoid antenna B and MIMO */
1809 if (tbl->action != IWL_MIMO2_SWITCH_SISO_A)
1810 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1811 break;
1812 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1813 /* avoid antenna B unless MIMO */
1814 if (tbl->action == IWL_MIMO2_SWITCH_SISO_B ||
1815 tbl->action == IWL_MIMO2_SWITCH_SISO_C)
1816 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1817 break;
1818 default:
1819 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1820 break;
1821 }
1822
1823 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1824 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1825 tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1826 /* switch in SISO */
1827 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1828 }
1829
1830 /* configure as 1x1 if bt full concurrency */
1831 if (priv->bt_full_concurrent &&
1832 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1833 tbl->action > IWL_MIMO2_SWITCH_SISO_C))
1834 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1835
1836 start_action = tbl->action;
1837 for (;;) {
1838 lq_sta->action_counter++;
1839 switch (tbl->action) {
1840 case IWL_MIMO2_SWITCH_ANTENNA1:
1841 case IWL_MIMO2_SWITCH_ANTENNA2:
1842 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1843
1844 if (tx_chains_num <= 2)
1845 break;
1846
1847 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1848 break;
1849
1850 memcpy(search_tbl, tbl, sz);
1851 if (rs_toggle_antenna(valid_tx_ant,
1852 &search_tbl->current_rate, search_tbl)) {
1853 update_search_tbl_counter = 1;
1854 goto out;
1855 }
1856 break;
1857 case IWL_MIMO2_SWITCH_SISO_A:
1858 case IWL_MIMO2_SWITCH_SISO_B:
1859 case IWL_MIMO2_SWITCH_SISO_C:
1860 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1861
1862 /* Set up new search table for SISO */
1863 memcpy(search_tbl, tbl, sz);
1864
1865 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1866 search_tbl->ant_type = ANT_A;
1867 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1868 search_tbl->ant_type = ANT_B;
1869 else
1870 search_tbl->ant_type = ANT_C;
1871
1872 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1873 break;
1874
1875 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1876 search_tbl, index);
1877 if (!ret)
1878 goto out;
1879
1880 break;
1881
1882 case IWL_MIMO2_SWITCH_GI:
1883 if (!tbl->is_ht40 && !(ht_cap->cap &
1884 IEEE80211_HT_CAP_SGI_20))
1885 break;
1886 if (tbl->is_ht40 && !(ht_cap->cap &
1887 IEEE80211_HT_CAP_SGI_40))
1888 break;
1889
1890 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1891
1892 /* Set up new search table for MIMO2 */
1893 memcpy(search_tbl, tbl, sz);
1894 search_tbl->is_SGI = !tbl->is_SGI;
1895 rs_set_expected_tpt_table(lq_sta, search_tbl);
1896 /*
1897 * If active table already uses the fastest possible
1898 * modulation (dual stream with short guard interval),
1899 * and it's working well, there's no need to look
1900 * for a better type of modulation!
1901 */
1902 if (tbl->is_SGI) {
1903 s32 tpt = lq_sta->last_tpt / 100;
1904 if (tpt >= search_tbl->expected_tpt[index])
1905 break;
1906 }
1907 search_tbl->current_rate =
1908 rate_n_flags_from_tbl(priv, search_tbl,
1909 index, is_green);
1910 update_search_tbl_counter = 1;
1911 goto out;
1912
1913 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1914 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1915 memcpy(search_tbl, tbl, sz);
1916 search_tbl->is_SGI = 0;
1917 search_tbl->ant_type = ANT_ABC;
1918
1919 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1920 break;
1921
1922 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1923 search_tbl, index);
1924 if (!ret)
1925 goto out;
1926
1927 break;
1928 }
1929 tbl->action++;
1930 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1931 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1932
1933 if (tbl->action == start_action)
1934 break;
1935 }
1936 search_tbl->lq_type = LQ_NONE;
1937 return 0;
1938 out:
1939 lq_sta->search_better_tbl = 1;
1940 tbl->action++;
1941 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1942 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1943 if (update_search_tbl_counter)
1944 search_tbl->action = tbl->action;
1945
1946 return 0;
1947
1948 }
1949
1950 /*
1951 * Try to switch to new modulation mode from MIMO3
1952 */
1953 static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1954 struct iwl_lq_sta *lq_sta,
1955 struct ieee80211_conf *conf,
1956 struct ieee80211_sta *sta, int index)
1957 {
1958 s8 is_green = lq_sta->is_green;
1959 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1960 struct iwl_scale_tbl_info *search_tbl =
1961 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1962 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1963 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1964 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1965 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1966 u8 start_action;
1967 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1968 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1969 int ret;
1970 u8 update_search_tbl_counter = 0;
1971
1972 switch (priv->bt_traffic_load) {
1973 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1974 /* nothing */
1975 break;
1976 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1977 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1978 /* avoid antenna B and MIMO */
1979 if (tbl->action != IWL_MIMO3_SWITCH_SISO_A)
1980 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1981 break;
1982 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1983 /* avoid antenna B unless MIMO */
1984 if (tbl->action == IWL_MIMO3_SWITCH_SISO_B ||
1985 tbl->action == IWL_MIMO3_SWITCH_SISO_C)
1986 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1987 break;
1988 default:
1989 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1990 break;
1991 }
1992
1993 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1994 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1995 tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1996 /* switch in SISO */
1997 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1998 }
1999
2000 /* configure as 1x1 if bt full concurrency */
2001 if (priv->bt_full_concurrent &&
2002 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
2003 tbl->action > IWL_MIMO3_SWITCH_SISO_C))
2004 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
2005
2006 start_action = tbl->action;
2007 for (;;) {
2008 lq_sta->action_counter++;
2009 switch (tbl->action) {
2010 case IWL_MIMO3_SWITCH_ANTENNA1:
2011 case IWL_MIMO3_SWITCH_ANTENNA2:
2012 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
2013
2014 if (tx_chains_num <= 3)
2015 break;
2016
2017 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
2018 break;
2019
2020 memcpy(search_tbl, tbl, sz);
2021 if (rs_toggle_antenna(valid_tx_ant,
2022 &search_tbl->current_rate, search_tbl))
2023 goto out;
2024 break;
2025 case IWL_MIMO3_SWITCH_SISO_A:
2026 case IWL_MIMO3_SWITCH_SISO_B:
2027 case IWL_MIMO3_SWITCH_SISO_C:
2028 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
2029
2030 /* Set up new search table for SISO */
2031 memcpy(search_tbl, tbl, sz);
2032
2033 if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
2034 search_tbl->ant_type = ANT_A;
2035 else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
2036 search_tbl->ant_type = ANT_B;
2037 else
2038 search_tbl->ant_type = ANT_C;
2039
2040 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2041 break;
2042
2043 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
2044 search_tbl, index);
2045 if (!ret)
2046 goto out;
2047
2048 break;
2049
2050 case IWL_MIMO3_SWITCH_MIMO2_AB:
2051 case IWL_MIMO3_SWITCH_MIMO2_AC:
2052 case IWL_MIMO3_SWITCH_MIMO2_BC:
2053 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
2054
2055 memcpy(search_tbl, tbl, sz);
2056 search_tbl->is_SGI = 0;
2057 if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
2058 search_tbl->ant_type = ANT_AB;
2059 else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
2060 search_tbl->ant_type = ANT_AC;
2061 else
2062 search_tbl->ant_type = ANT_BC;
2063
2064 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2065 break;
2066
2067 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
2068 search_tbl, index);
2069 if (!ret)
2070 goto out;
2071
2072 break;
2073
2074 case IWL_MIMO3_SWITCH_GI:
2075 if (!tbl->is_ht40 && !(ht_cap->cap &
2076 IEEE80211_HT_CAP_SGI_20))
2077 break;
2078 if (tbl->is_ht40 && !(ht_cap->cap &
2079 IEEE80211_HT_CAP_SGI_40))
2080 break;
2081
2082 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
2083
2084 /* Set up new search table for MIMO */
2085 memcpy(search_tbl, tbl, sz);
2086 search_tbl->is_SGI = !tbl->is_SGI;
2087 rs_set_expected_tpt_table(lq_sta, search_tbl);
2088 /*
2089 * If active table already uses the fastest possible
2090 * modulation (dual stream with short guard interval),
2091 * and it's working well, there's no need to look
2092 * for a better type of modulation!
2093 */
2094 if (tbl->is_SGI) {
2095 s32 tpt = lq_sta->last_tpt / 100;
2096 if (tpt >= search_tbl->expected_tpt[index])
2097 break;
2098 }
2099 search_tbl->current_rate =
2100 rate_n_flags_from_tbl(priv, search_tbl,
2101 index, is_green);
2102 update_search_tbl_counter = 1;
2103 goto out;
2104 }
2105 tbl->action++;
2106 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2107 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2108
2109 if (tbl->action == start_action)
2110 break;
2111 }
2112 search_tbl->lq_type = LQ_NONE;
2113 return 0;
2114 out:
2115 lq_sta->search_better_tbl = 1;
2116 tbl->action++;
2117 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2118 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2119 if (update_search_tbl_counter)
2120 search_tbl->action = tbl->action;
2121
2122 return 0;
2123
2124 }
2125
2126 /*
2127 * Check whether we should continue using same modulation mode, or
2128 * begin search for a new mode, based on:
2129 * 1) # tx successes or failures while using this mode
2130 * 2) # times calling this function
2131 * 3) elapsed time in this mode (not used, for now)
2132 */
2133 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
2134 {
2135 struct iwl_scale_tbl_info *tbl;
2136 int i;
2137 int active_tbl;
2138 int flush_interval_passed = 0;
2139 struct iwl_priv *priv;
2140
2141 priv = lq_sta->drv;
2142 active_tbl = lq_sta->active_tbl;
2143
2144 tbl = &(lq_sta->lq_info[active_tbl]);
2145
2146 /* If we've been disallowing search, see if we should now allow it */
2147 if (lq_sta->stay_in_tbl) {
2148
2149 /* Elapsed time using current modulation mode */
2150 if (lq_sta->flush_timer)
2151 flush_interval_passed =
2152 time_after(jiffies,
2153 (unsigned long)(lq_sta->flush_timer +
2154 IWL_RATE_SCALE_FLUSH_INTVL));
2155
2156 /*
2157 * Check if we should allow search for new modulation mode.
2158 * If many frames have failed or succeeded, or we've used
2159 * this same modulation for a long time, allow search, and
2160 * reset history stats that keep track of whether we should
2161 * allow a new search. Also (below) reset all bitmaps and
2162 * stats in active history.
2163 */
2164 if (force_search ||
2165 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
2166 (lq_sta->total_success > lq_sta->max_success_limit) ||
2167 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
2168 && (flush_interval_passed))) {
2169 IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n:",
2170 lq_sta->total_failed,
2171 lq_sta->total_success,
2172 flush_interval_passed);
2173
2174 /* Allow search for new mode */
2175 lq_sta->stay_in_tbl = 0; /* only place reset */
2176 lq_sta->total_failed = 0;
2177 lq_sta->total_success = 0;
2178 lq_sta->flush_timer = 0;
2179
2180 /*
2181 * Else if we've used this modulation mode enough repetitions
2182 * (regardless of elapsed time or success/failure), reset
2183 * history bitmaps and rate-specific stats for all rates in
2184 * active table.
2185 */
2186 } else {
2187 lq_sta->table_count++;
2188 if (lq_sta->table_count >=
2189 lq_sta->table_count_limit) {
2190 lq_sta->table_count = 0;
2191
2192 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
2193 for (i = 0; i < IWL_RATE_COUNT; i++)
2194 rs_rate_scale_clear_window(
2195 &(tbl->win[i]));
2196 }
2197 }
2198
2199 /* If transitioning to allow "search", reset all history
2200 * bitmaps and stats in active table (this will become the new
2201 * "search" table). */
2202 if (!lq_sta->stay_in_tbl) {
2203 for (i = 0; i < IWL_RATE_COUNT; i++)
2204 rs_rate_scale_clear_window(&(tbl->win[i]));
2205 }
2206 }
2207 }
2208
2209 /*
2210 * setup rate table in uCode
2211 * return rate_n_flags as used in the table
2212 */
2213 static void rs_update_rate_tbl(struct iwl_priv *priv,
2214 struct iwl_rxon_context *ctx,
2215 struct iwl_lq_sta *lq_sta,
2216 struct iwl_scale_tbl_info *tbl,
2217 int index, u8 is_green)
2218 {
2219 u32 rate;
2220
2221 /* Update uCode's rate table. */
2222 rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2223 rs_fill_link_cmd(priv, lq_sta, rate);
2224 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2225 }
2226
2227 /*
2228 * Do rate scaling and search for new modulation mode.
2229 */
2230 static void rs_rate_scale_perform(struct iwl_priv *priv,
2231 struct sk_buff *skb,
2232 struct ieee80211_sta *sta,
2233 struct iwl_lq_sta *lq_sta)
2234 {
2235 struct ieee80211_hw *hw = priv->hw;
2236 struct ieee80211_conf *conf = &hw->conf;
2237 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2238 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2239 int low = IWL_RATE_INVALID;
2240 int high = IWL_RATE_INVALID;
2241 int index;
2242 int i;
2243 struct iwl_rate_scale_data *window = NULL;
2244 int current_tpt = IWL_INVALID_VALUE;
2245 int low_tpt = IWL_INVALID_VALUE;
2246 int high_tpt = IWL_INVALID_VALUE;
2247 u32 fail_count;
2248 s8 scale_action = 0;
2249 u16 rate_mask;
2250 u8 update_lq = 0;
2251 struct iwl_scale_tbl_info *tbl, *tbl1;
2252 u16 rate_scale_index_msk = 0;
2253 u8 is_green = 0;
2254 u8 active_tbl = 0;
2255 u8 done_search = 0;
2256 u16 high_low;
2257 s32 sr;
2258 u8 tid = MAX_TID_COUNT;
2259 struct iwl_tid_data *tid_data;
2260 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
2261 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
2262
2263 IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
2264
2265 /* Send management frames and NO_ACK data using lowest rate. */
2266 /* TODO: this could probably be improved.. */
2267 if (!ieee80211_is_data(hdr->frame_control) ||
2268 info->flags & IEEE80211_TX_CTL_NO_ACK)
2269 return;
2270
2271 if (!sta || !lq_sta)
2272 return;
2273
2274 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
2275
2276 tid = rs_tl_add_packet(lq_sta, hdr);
2277 if ((tid != MAX_TID_COUNT) && (lq_sta->tx_agg_tid_en & (1 << tid))) {
2278 tid_data = &priv->stations[lq_sta->lq.sta_id].tid[tid];
2279 if (tid_data->agg.state == IWL_AGG_OFF)
2280 lq_sta->is_agg = 0;
2281 else
2282 lq_sta->is_agg = 1;
2283 } else
2284 lq_sta->is_agg = 0;
2285
2286 /*
2287 * Select rate-scale / modulation-mode table to work with in
2288 * the rest of this function: "search" if searching for better
2289 * modulation mode, or "active" if doing rate scaling within a mode.
2290 */
2291 if (!lq_sta->search_better_tbl)
2292 active_tbl = lq_sta->active_tbl;
2293 else
2294 active_tbl = 1 - lq_sta->active_tbl;
2295
2296 tbl = &(lq_sta->lq_info[active_tbl]);
2297 if (is_legacy(tbl->lq_type))
2298 lq_sta->is_green = 0;
2299 else
2300 lq_sta->is_green = rs_use_green(sta);
2301 is_green = lq_sta->is_green;
2302
2303 /* current tx rate */
2304 index = lq_sta->last_txrate_idx;
2305
2306 IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2307 tbl->lq_type);
2308
2309 /* rates available for this association, and for modulation mode */
2310 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2311
2312 IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
2313
2314 /* mask with station rate restriction */
2315 if (is_legacy(tbl->lq_type)) {
2316 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2317 /* supp_rates has no CCK bits in A mode */
2318 rate_scale_index_msk = (u16) (rate_mask &
2319 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2320 else
2321 rate_scale_index_msk = (u16) (rate_mask &
2322 lq_sta->supp_rates);
2323
2324 } else
2325 rate_scale_index_msk = rate_mask;
2326
2327 if (!rate_scale_index_msk)
2328 rate_scale_index_msk = rate_mask;
2329
2330 if (!((1 << index) & rate_scale_index_msk)) {
2331 IWL_ERR(priv, "Current Rate is not valid\n");
2332 if (lq_sta->search_better_tbl) {
2333 /* revert to active table if search table is not valid*/
2334 tbl->lq_type = LQ_NONE;
2335 lq_sta->search_better_tbl = 0;
2336 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2337 /* get "active" rate info */
2338 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2339 rs_update_rate_tbl(priv, ctx, lq_sta, tbl,
2340 index, is_green);
2341 }
2342 return;
2343 }
2344
2345 /* Get expected throughput table and history window for current rate */
2346 if (!tbl->expected_tpt) {
2347 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2348 return;
2349 }
2350
2351 /* force user max rate if set by user */
2352 if ((lq_sta->max_rate_idx != -1) &&
2353 (lq_sta->max_rate_idx < index)) {
2354 index = lq_sta->max_rate_idx;
2355 update_lq = 1;
2356 window = &(tbl->win[index]);
2357 goto lq_update;
2358 }
2359
2360 window = &(tbl->win[index]);
2361
2362 /*
2363 * If there is not enough history to calculate actual average
2364 * throughput, keep analyzing results of more tx frames, without
2365 * changing rate or mode (bypass most of the rest of this function).
2366 * Set up new rate table in uCode only if old rate is not supported
2367 * in current association (use new rate found above).
2368 */
2369 fail_count = window->counter - window->success_counter;
2370 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2371 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2372 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2373 "for index %d\n",
2374 window->success_counter, window->counter, index);
2375
2376 /* Can't calculate this yet; not enough history */
2377 window->average_tpt = IWL_INVALID_VALUE;
2378
2379 /* Should we stay with this modulation mode,
2380 * or search for a new one? */
2381 rs_stay_in_table(lq_sta, false);
2382
2383 goto out;
2384 }
2385 /* Else we have enough samples; calculate estimate of
2386 * actual average throughput */
2387 if (window->average_tpt != ((window->success_ratio *
2388 tbl->expected_tpt[index] + 64) / 128)) {
2389 IWL_ERR(priv, "expected_tpt should have been calculated by now\n");
2390 window->average_tpt = ((window->success_ratio *
2391 tbl->expected_tpt[index] + 64) / 128);
2392 }
2393
2394 /* If we are searching for better modulation mode, check success. */
2395 if (lq_sta->search_better_tbl &&
2396 (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
2397 /* If good success, continue using the "search" mode;
2398 * no need to send new link quality command, since we're
2399 * continuing to use the setup that we've been trying. */
2400 if (window->average_tpt > lq_sta->last_tpt) {
2401
2402 IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2403 "suc=%d cur-tpt=%d old-tpt=%d\n",
2404 window->success_ratio,
2405 window->average_tpt,
2406 lq_sta->last_tpt);
2407
2408 if (!is_legacy(tbl->lq_type))
2409 lq_sta->enable_counter = 1;
2410
2411 /* Swap tables; "search" becomes "active" */
2412 lq_sta->active_tbl = active_tbl;
2413 current_tpt = window->average_tpt;
2414
2415 /* Else poor success; go back to mode in "active" table */
2416 } else {
2417
2418 IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2419 "suc=%d cur-tpt=%d old-tpt=%d\n",
2420 window->success_ratio,
2421 window->average_tpt,
2422 lq_sta->last_tpt);
2423
2424 /* Nullify "search" table */
2425 tbl->lq_type = LQ_NONE;
2426
2427 /* Revert to "active" table */
2428 active_tbl = lq_sta->active_tbl;
2429 tbl = &(lq_sta->lq_info[active_tbl]);
2430
2431 /* Revert to "active" rate and throughput info */
2432 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2433 current_tpt = lq_sta->last_tpt;
2434
2435 /* Need to set up a new rate table in uCode */
2436 update_lq = 1;
2437 }
2438
2439 /* Either way, we've made a decision; modulation mode
2440 * search is done, allow rate adjustment next time. */
2441 lq_sta->search_better_tbl = 0;
2442 done_search = 1; /* Don't switch modes below! */
2443 goto lq_update;
2444 }
2445
2446 /* (Else) not in search of better modulation mode, try for better
2447 * starting rate, while staying in this mode. */
2448 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2449 tbl->lq_type);
2450 low = high_low & 0xff;
2451 high = (high_low >> 8) & 0xff;
2452
2453 /* If user set max rate, dont allow higher than user constrain */
2454 if ((lq_sta->max_rate_idx != -1) &&
2455 (lq_sta->max_rate_idx < high))
2456 high = IWL_RATE_INVALID;
2457
2458 sr = window->success_ratio;
2459
2460 /* Collect measured throughputs for current and adjacent rates */
2461 current_tpt = window->average_tpt;
2462 if (low != IWL_RATE_INVALID)
2463 low_tpt = tbl->win[low].average_tpt;
2464 if (high != IWL_RATE_INVALID)
2465 high_tpt = tbl->win[high].average_tpt;
2466
2467 scale_action = 0;
2468
2469 /* Too many failures, decrease rate */
2470 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2471 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2472 scale_action = -1;
2473
2474 /* No throughput measured yet for adjacent rates; try increase. */
2475 } else if ((low_tpt == IWL_INVALID_VALUE) &&
2476 (high_tpt == IWL_INVALID_VALUE)) {
2477
2478 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2479 scale_action = 1;
2480 else if (low != IWL_RATE_INVALID)
2481 scale_action = 0;
2482 }
2483
2484 /* Both adjacent throughputs are measured, but neither one has better
2485 * throughput; we're using the best rate, don't change it! */
2486 else if ((low_tpt != IWL_INVALID_VALUE) &&
2487 (high_tpt != IWL_INVALID_VALUE) &&
2488 (low_tpt < current_tpt) &&
2489 (high_tpt < current_tpt))
2490 scale_action = 0;
2491
2492 /* At least one adjacent rate's throughput is measured,
2493 * and may have better performance. */
2494 else {
2495 /* Higher adjacent rate's throughput is measured */
2496 if (high_tpt != IWL_INVALID_VALUE) {
2497 /* Higher rate has better throughput */
2498 if (high_tpt > current_tpt &&
2499 sr >= IWL_RATE_INCREASE_TH) {
2500 scale_action = 1;
2501 } else {
2502 scale_action = 0;
2503 }
2504
2505 /* Lower adjacent rate's throughput is measured */
2506 } else if (low_tpt != IWL_INVALID_VALUE) {
2507 /* Lower rate has better throughput */
2508 if (low_tpt > current_tpt) {
2509 IWL_DEBUG_RATE(priv,
2510 "decrease rate because of low tpt\n");
2511 scale_action = -1;
2512 } else if (sr >= IWL_RATE_INCREASE_TH) {
2513 scale_action = 1;
2514 }
2515 }
2516 }
2517
2518 /* Sanity check; asked for decrease, but success rate or throughput
2519 * has been good at old rate. Don't change it. */
2520 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2521 ((sr > IWL_RATE_HIGH_TH) ||
2522 (current_tpt > (100 * tbl->expected_tpt[low]))))
2523 scale_action = 0;
2524 if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2525 scale_action = -1;
2526 if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
2527 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2528 scale_action = -1;
2529
2530 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2531 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2532 if (lq_sta->last_bt_traffic > priv->bt_traffic_load) {
2533 /*
2534 * don't set scale_action, don't want to scale up if
2535 * the rate scale doesn't otherwise think that is a
2536 * good idea.
2537 */
2538 } else if (lq_sta->last_bt_traffic <= priv->bt_traffic_load) {
2539 scale_action = -1;
2540 }
2541 }
2542 lq_sta->last_bt_traffic = priv->bt_traffic_load;
2543
2544 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2545 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2546 /* search for a new modulation */
2547 rs_stay_in_table(lq_sta, true);
2548 goto lq_update;
2549 }
2550
2551 switch (scale_action) {
2552 case -1:
2553 /* Decrease starting rate, update uCode's rate table */
2554 if (low != IWL_RATE_INVALID) {
2555 update_lq = 1;
2556 index = low;
2557 }
2558
2559 break;
2560 case 1:
2561 /* Increase starting rate, update uCode's rate table */
2562 if (high != IWL_RATE_INVALID) {
2563 update_lq = 1;
2564 index = high;
2565 }
2566
2567 break;
2568 case 0:
2569 /* No change */
2570 default:
2571 break;
2572 }
2573
2574 IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2575 "high %d type %d\n",
2576 index, scale_action, low, high, tbl->lq_type);
2577
2578 lq_update:
2579 /* Replace uCode's rate table for the destination station. */
2580 if (update_lq)
2581 rs_update_rate_tbl(priv, ctx, lq_sta, tbl, index, is_green);
2582
2583 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
2584 /* Should we stay with this modulation mode,
2585 * or search for a new one? */
2586 rs_stay_in_table(lq_sta, false);
2587 }
2588 /*
2589 * Search for new modulation mode if we're:
2590 * 1) Not changing rates right now
2591 * 2) Not just finishing up a search
2592 * 3) Allowing a new search
2593 */
2594 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2595 /* Save current throughput to compare with "search" throughput*/
2596 lq_sta->last_tpt = current_tpt;
2597
2598 /* Select a new "search" modulation mode to try.
2599 * If one is found, set up the new "search" table. */
2600 if (is_legacy(tbl->lq_type))
2601 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2602 else if (is_siso(tbl->lq_type))
2603 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2604 else if (is_mimo2(tbl->lq_type))
2605 rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2606 else
2607 rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2608
2609 /* If new "search" mode was selected, set up in uCode table */
2610 if (lq_sta->search_better_tbl) {
2611 /* Access the "search" table, clear its history. */
2612 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2613 for (i = 0; i < IWL_RATE_COUNT; i++)
2614 rs_rate_scale_clear_window(&(tbl->win[i]));
2615
2616 /* Use new "search" start rate */
2617 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2618
2619 IWL_DEBUG_RATE(priv, "Switch current mcs: %X index: %d\n",
2620 tbl->current_rate, index);
2621 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2622 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2623 } else
2624 done_search = 1;
2625 }
2626
2627 if (done_search && !lq_sta->stay_in_tbl) {
2628 /* If the "active" (non-search) mode was legacy,
2629 * and we've tried switching antennas,
2630 * but we haven't been able to try HT modes (not available),
2631 * stay with best antenna legacy modulation for a while
2632 * before next round of mode comparisons. */
2633 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2634 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2635 lq_sta->action_counter > tbl1->max_search) {
2636 IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2637 rs_set_stay_in_table(priv, 1, lq_sta);
2638 }
2639
2640 /* If we're in an HT mode, and all 3 mode switch actions
2641 * have been tried and compared, stay in this best modulation
2642 * mode for a while before next round of mode comparisons. */
2643 if (lq_sta->enable_counter &&
2644 (lq_sta->action_counter >= tbl1->max_search) &&
2645 iwl_ht_enabled(priv)) {
2646 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2647 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2648 (tid != MAX_TID_COUNT)) {
2649 tid_data =
2650 &priv->stations[lq_sta->lq.sta_id].tid[tid];
2651 if (tid_data->agg.state == IWL_AGG_OFF) {
2652 IWL_DEBUG_RATE(priv,
2653 "try to aggregate tid %d\n",
2654 tid);
2655 rs_tl_turn_on_agg(priv, tid,
2656 lq_sta, sta);
2657 }
2658 }
2659 rs_set_stay_in_table(priv, 0, lq_sta);
2660 }
2661 }
2662
2663 out:
2664 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2665 i = index;
2666 lq_sta->last_txrate_idx = i;
2667 }
2668
2669 /**
2670 * rs_initialize_lq - Initialize a station's hardware rate table
2671 *
2672 * The uCode's station table contains a table of fallback rates
2673 * for automatic fallback during transmission.
2674 *
2675 * NOTE: This sets up a default set of values. These will be replaced later
2676 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2677 * rc80211_simple.
2678 *
2679 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2680 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2681 * which requires station table entry to exist).
2682 */
2683 static void rs_initialize_lq(struct iwl_priv *priv,
2684 struct ieee80211_conf *conf,
2685 struct ieee80211_sta *sta,
2686 struct iwl_lq_sta *lq_sta)
2687 {
2688 struct iwl_scale_tbl_info *tbl;
2689 int rate_idx;
2690 int i;
2691 u32 rate;
2692 u8 use_green = rs_use_green(sta);
2693 u8 active_tbl = 0;
2694 u8 valid_tx_ant;
2695 struct iwl_station_priv *sta_priv;
2696 struct iwl_rxon_context *ctx;
2697
2698 if (!sta || !lq_sta)
2699 return;
2700
2701 sta_priv = (void *)sta->drv_priv;
2702 ctx = sta_priv->common.ctx;
2703
2704 i = lq_sta->last_txrate_idx;
2705
2706 valid_tx_ant = priv->hw_params.valid_tx_ant;
2707
2708 if (!lq_sta->search_better_tbl)
2709 active_tbl = lq_sta->active_tbl;
2710 else
2711 active_tbl = 1 - lq_sta->active_tbl;
2712
2713 tbl = &(lq_sta->lq_info[active_tbl]);
2714
2715 if ((i < 0) || (i >= IWL_RATE_COUNT))
2716 i = 0;
2717
2718 rate = iwl_rates[i].plcp;
2719 tbl->ant_type = first_antenna(valid_tx_ant);
2720 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2721
2722 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2723 rate |= RATE_MCS_CCK_MSK;
2724
2725 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2726 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2727 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2728
2729 rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2730 tbl->current_rate = rate;
2731 rs_set_expected_tpt_table(lq_sta, tbl);
2732 rs_fill_link_cmd(NULL, lq_sta, rate);
2733 priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2734 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_SYNC, true);
2735 }
2736
2737 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2738 struct ieee80211_tx_rate_control *txrc)
2739 {
2740
2741 struct sk_buff *skb = txrc->skb;
2742 struct ieee80211_supported_band *sband = txrc->sband;
2743 struct iwl_priv *priv __maybe_unused = (struct iwl_priv *)priv_r;
2744 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2745 struct iwl_lq_sta *lq_sta = priv_sta;
2746 int rate_idx;
2747
2748 IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2749
2750 /* Get max rate if user set max rate */
2751 if (lq_sta) {
2752 lq_sta->max_rate_idx = txrc->max_rate_idx;
2753 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2754 (lq_sta->max_rate_idx != -1))
2755 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2756 if ((lq_sta->max_rate_idx < 0) ||
2757 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2758 lq_sta->max_rate_idx = -1;
2759 }
2760
2761 /* Treat uninitialized rate scaling data same as non-existing. */
2762 if (lq_sta && !lq_sta->drv) {
2763 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
2764 priv_sta = NULL;
2765 }
2766
2767 /* Send management frames and NO_ACK data using lowest rate. */
2768 if (rate_control_send_low(sta, priv_sta, txrc))
2769 return;
2770
2771 rate_idx = lq_sta->last_txrate_idx;
2772
2773 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2774 rate_idx -= IWL_FIRST_OFDM_RATE;
2775 /* 6M and 9M shared same MCS index */
2776 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2777 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2778 IWL_RATE_MIMO3_6M_PLCP)
2779 rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2780 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2781 IWL_RATE_MIMO2_6M_PLCP)
2782 rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2783 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2784 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2785 info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2786 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2787 info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
2788 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2789 info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2790 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2791 info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2792 } else {
2793 /* Check for invalid rates */
2794 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2795 ((sband->band == IEEE80211_BAND_5GHZ) &&
2796 (rate_idx < IWL_FIRST_OFDM_RATE)))
2797 rate_idx = rate_lowest_index(sband, sta);
2798 /* On valid 5 GHz rate, adjust index */
2799 else if (sband->band == IEEE80211_BAND_5GHZ)
2800 rate_idx -= IWL_FIRST_OFDM_RATE;
2801 info->control.rates[0].flags = 0;
2802 }
2803 info->control.rates[0].idx = rate_idx;
2804
2805 }
2806
2807 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2808 gfp_t gfp)
2809 {
2810 struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2811 struct iwl_priv *priv;
2812
2813 priv = (struct iwl_priv *)priv_rate;
2814 IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2815
2816 return &sta_priv->lq_sta;
2817 }
2818
2819 /*
2820 * Called after adding a new station to initialize rate scaling
2821 */
2822 void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id)
2823 {
2824 int i, j;
2825 struct ieee80211_hw *hw = priv->hw;
2826 struct ieee80211_conf *conf = &priv->hw->conf;
2827 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2828 struct iwl_station_priv *sta_priv;
2829 struct iwl_lq_sta *lq_sta;
2830 struct ieee80211_supported_band *sband;
2831
2832 sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2833 lq_sta = &sta_priv->lq_sta;
2834 sband = hw->wiphy->bands[conf->channel->band];
2835
2836
2837 lq_sta->lq.sta_id = sta_id;
2838
2839 for (j = 0; j < LQ_SIZE; j++)
2840 for (i = 0; i < IWL_RATE_COUNT; i++)
2841 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2842
2843 lq_sta->flush_timer = 0;
2844 lq_sta->supp_rates = sta->supp_rates[sband->band];
2845 for (j = 0; j < LQ_SIZE; j++)
2846 for (i = 0; i < IWL_RATE_COUNT; i++)
2847 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2848
2849 IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n",
2850 sta_id);
2851 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2852 * the lowest or the highest rate.. Could consider using RSSI from
2853 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2854 * after assoc.. */
2855
2856 lq_sta->is_dup = 0;
2857 lq_sta->max_rate_idx = -1;
2858 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2859 lq_sta->is_green = rs_use_green(sta);
2860 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2861 lq_sta->band = priv->band;
2862 /*
2863 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2864 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2865 */
2866 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2867 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2868 lq_sta->active_siso_rate &= ~((u16)0x2);
2869 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2870
2871 /* Same here */
2872 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2873 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2874 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2875 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2876
2877 lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2878 lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2879 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2880 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2881
2882 IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2883 lq_sta->active_siso_rate,
2884 lq_sta->active_mimo2_rate,
2885 lq_sta->active_mimo3_rate);
2886
2887 /* These values will be overridden later */
2888 lq_sta->lq.general_params.single_stream_ant_msk =
2889 first_antenna(priv->hw_params.valid_tx_ant);
2890 lq_sta->lq.general_params.dual_stream_ant_msk =
2891 priv->hw_params.valid_tx_ant &
2892 ~first_antenna(priv->hw_params.valid_tx_ant);
2893 if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2894 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2895 } else if (num_of_ant(priv->hw_params.valid_tx_ant) == 2) {
2896 lq_sta->lq.general_params.dual_stream_ant_msk =
2897 priv->hw_params.valid_tx_ant;
2898 }
2899
2900 /* as default allow aggregation for all tids */
2901 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2902 lq_sta->drv = priv;
2903
2904 /* Set last_txrate_idx to lowest rate */
2905 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2906 if (sband->band == IEEE80211_BAND_5GHZ)
2907 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2908 lq_sta->is_agg = 0;
2909 #ifdef CONFIG_IWLWIFI_DEVICE_SVTOOL
2910 priv->tm_fixed_rate = 0;
2911 #endif
2912 #ifdef CONFIG_MAC80211_DEBUGFS
2913 lq_sta->dbg_fixed_rate = 0;
2914 #endif
2915
2916 rs_initialize_lq(priv, conf, sta, lq_sta);
2917 }
2918
2919 static void rs_fill_link_cmd(struct iwl_priv *priv,
2920 struct iwl_lq_sta *lq_sta, u32 new_rate)
2921 {
2922 struct iwl_scale_tbl_info tbl_type;
2923 int index = 0;
2924 int rate_idx;
2925 int repeat_rate = 0;
2926 u8 ant_toggle_cnt = 0;
2927 u8 use_ht_possible = 1;
2928 u8 valid_tx_ant = 0;
2929 struct iwl_station_priv *sta_priv =
2930 container_of(lq_sta, struct iwl_station_priv, lq_sta);
2931 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2932
2933 /* Override starting rate (index 0) if needed for debug purposes */
2934 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2935
2936 /* Interpret new_rate (rate_n_flags) */
2937 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2938 &tbl_type, &rate_idx);
2939
2940 if (priv && priv->bt_full_concurrent) {
2941 /* 1x1 only */
2942 tbl_type.ant_type =
2943 first_antenna(priv->hw_params.valid_tx_ant);
2944 }
2945
2946 /* How many times should we repeat the initial rate? */
2947 if (is_legacy(tbl_type.lq_type)) {
2948 ant_toggle_cnt = 1;
2949 repeat_rate = IWL_NUMBER_TRY;
2950 } else {
2951 repeat_rate = min(IWL_HT_NUMBER_TRY,
2952 LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2953 }
2954
2955 lq_cmd->general_params.mimo_delimiter =
2956 is_mimo(tbl_type.lq_type) ? 1 : 0;
2957
2958 /* Fill 1st table entry (index 0) */
2959 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2960
2961 if (num_of_ant(tbl_type.ant_type) == 1) {
2962 lq_cmd->general_params.single_stream_ant_msk =
2963 tbl_type.ant_type;
2964 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2965 lq_cmd->general_params.dual_stream_ant_msk =
2966 tbl_type.ant_type;
2967 } /* otherwise we don't modify the existing value */
2968
2969 index++;
2970 repeat_rate--;
2971 if (priv) {
2972 if (priv->bt_full_concurrent)
2973 valid_tx_ant = ANT_A;
2974 else
2975 valid_tx_ant = priv->hw_params.valid_tx_ant;
2976 }
2977
2978 /* Fill rest of rate table */
2979 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2980 /* Repeat initial/next rate.
2981 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2982 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2983 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2984 if (is_legacy(tbl_type.lq_type)) {
2985 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2986 ant_toggle_cnt++;
2987 else if (priv &&
2988 rs_toggle_antenna(valid_tx_ant,
2989 &new_rate, &tbl_type))
2990 ant_toggle_cnt = 1;
2991 }
2992
2993 /* Override next rate if needed for debug purposes */
2994 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2995
2996 /* Fill next table entry */
2997 lq_cmd->rs_table[index].rate_n_flags =
2998 cpu_to_le32(new_rate);
2999 repeat_rate--;
3000 index++;
3001 }
3002
3003 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
3004 &rate_idx);
3005
3006 if (priv && priv->bt_full_concurrent) {
3007 /* 1x1 only */
3008 tbl_type.ant_type =
3009 first_antenna(priv->hw_params.valid_tx_ant);
3010 }
3011
3012 /* Indicate to uCode which entries might be MIMO.
3013 * If initial rate was MIMO, this will finally end up
3014 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
3015 if (is_mimo(tbl_type.lq_type))
3016 lq_cmd->general_params.mimo_delimiter = index;
3017
3018 /* Get next rate */
3019 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
3020 use_ht_possible);
3021
3022 /* How many times should we repeat the next rate? */
3023 if (is_legacy(tbl_type.lq_type)) {
3024 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
3025 ant_toggle_cnt++;
3026 else if (priv &&
3027 rs_toggle_antenna(valid_tx_ant,
3028 &new_rate, &tbl_type))
3029 ant_toggle_cnt = 1;
3030
3031 repeat_rate = IWL_NUMBER_TRY;
3032 } else {
3033 repeat_rate = IWL_HT_NUMBER_TRY;
3034 }
3035
3036 /* Don't allow HT rates after next pass.
3037 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
3038 use_ht_possible = 0;
3039
3040 /* Override next rate if needed for debug purposes */
3041 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
3042
3043 /* Fill next table entry */
3044 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
3045
3046 index++;
3047 repeat_rate--;
3048 }
3049
3050 lq_cmd->agg_params.agg_frame_cnt_limit =
3051 sta_priv->max_agg_bufsize ?: LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3052 lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
3053
3054 lq_cmd->agg_params.agg_time_limit =
3055 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
3056 /*
3057 * overwrite if needed, pass aggregation time limit
3058 * to uCode in uSec
3059 */
3060 if (priv && priv->cfg->bt_params &&
3061 priv->cfg->bt_params->agg_time_limit &&
3062 priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH)
3063 lq_cmd->agg_params.agg_time_limit =
3064 cpu_to_le16(priv->cfg->bt_params->agg_time_limit);
3065 }
3066
3067 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3068 {
3069 return hw->priv;
3070 }
3071 /* rate scale requires free function to be implemented */
3072 static void rs_free(void *priv_rate)
3073 {
3074 return;
3075 }
3076
3077 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
3078 void *priv_sta)
3079 {
3080 struct iwl_priv *priv __maybe_unused = priv_r;
3081
3082 IWL_DEBUG_RATE(priv, "enter\n");
3083 IWL_DEBUG_RATE(priv, "leave\n");
3084 }
3085
3086 #ifdef CONFIG_MAC80211_DEBUGFS
3087 static int open_file_generic(struct inode *inode, struct file *file)
3088 {
3089 file->private_data = inode->i_private;
3090 return 0;
3091 }
3092 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
3093 u32 *rate_n_flags, int index)
3094 {
3095 struct iwl_priv *priv;
3096 u8 valid_tx_ant;
3097 u8 ant_sel_tx;
3098
3099 priv = lq_sta->drv;
3100 valid_tx_ant = priv->hw_params.valid_tx_ant;
3101 if (lq_sta->dbg_fixed_rate) {
3102 ant_sel_tx =
3103 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
3104 >> RATE_MCS_ANT_POS);
3105 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
3106 *rate_n_flags = lq_sta->dbg_fixed_rate;
3107 IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
3108 } else {
3109 lq_sta->dbg_fixed_rate = 0;
3110 IWL_ERR(priv,
3111 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
3112 ant_sel_tx, valid_tx_ant);
3113 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3114 }
3115 } else {
3116 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3117 }
3118 }
3119
3120 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3121 const char __user *user_buf, size_t count, loff_t *ppos)
3122 {
3123 struct iwl_lq_sta *lq_sta = file->private_data;
3124 struct iwl_priv *priv;
3125 char buf[64];
3126 size_t buf_size;
3127 u32 parsed_rate;
3128
3129
3130 priv = lq_sta->drv;
3131 memset(buf, 0, sizeof(buf));
3132 buf_size = min(count, sizeof(buf) - 1);
3133 if (copy_from_user(buf, user_buf, buf_size))
3134 return -EFAULT;
3135
3136 if (sscanf(buf, "%x", &parsed_rate) == 1)
3137 lq_sta->dbg_fixed_rate = parsed_rate;
3138 else
3139 lq_sta->dbg_fixed_rate = 0;
3140
3141 rs_program_fix_rate(priv, lq_sta);
3142
3143 return count;
3144 }
3145
3146 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3147 char __user *user_buf, size_t count, loff_t *ppos)
3148 {
3149 char *buff;
3150 int desc = 0;
3151 int i = 0;
3152 int index = 0;
3153 ssize_t ret;
3154
3155 struct iwl_lq_sta *lq_sta = file->private_data;
3156 struct iwl_priv *priv;
3157 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3158
3159 priv = lq_sta->drv;
3160 buff = kmalloc(1024, GFP_KERNEL);
3161 if (!buff)
3162 return -ENOMEM;
3163
3164 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3165 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
3166 lq_sta->total_failed, lq_sta->total_success,
3167 lq_sta->active_legacy_rate);
3168 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3169 lq_sta->dbg_fixed_rate);
3170 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3171 (priv->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
3172 (priv->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
3173 (priv->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
3174 desc += sprintf(buff+desc, "lq type %s\n",
3175 (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
3176 if (is_Ht(tbl->lq_type)) {
3177 desc += sprintf(buff+desc, " %s",
3178 (is_siso(tbl->lq_type)) ? "SISO" :
3179 ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
3180 desc += sprintf(buff+desc, " %s",
3181 (tbl->is_ht40) ? "40MHz" : "20MHz");
3182 desc += sprintf(buff+desc, " %s %s %s\n", (tbl->is_SGI) ? "SGI" : "",
3183 (lq_sta->is_green) ? "GF enabled" : "",
3184 (lq_sta->is_agg) ? "AGG on" : "");
3185 }
3186 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3187 lq_sta->last_rate_n_flags);
3188 desc += sprintf(buff+desc, "general:"
3189 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
3190 lq_sta->lq.general_params.flags,
3191 lq_sta->lq.general_params.mimo_delimiter,
3192 lq_sta->lq.general_params.single_stream_ant_msk,
3193 lq_sta->lq.general_params.dual_stream_ant_msk);
3194
3195 desc += sprintf(buff+desc, "agg:"
3196 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3197 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
3198 lq_sta->lq.agg_params.agg_dis_start_th,
3199 lq_sta->lq.agg_params.agg_frame_cnt_limit);
3200
3201 desc += sprintf(buff+desc,
3202 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3203 lq_sta->lq.general_params.start_rate_index[0],
3204 lq_sta->lq.general_params.start_rate_index[1],
3205 lq_sta->lq.general_params.start_rate_index[2],
3206 lq_sta->lq.general_params.start_rate_index[3]);
3207
3208 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3209 index = iwl_hwrate_to_plcp_idx(
3210 le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
3211 if (is_legacy(tbl->lq_type)) {
3212 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
3213 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3214 iwl_rate_mcs[index].mbps);
3215 } else {
3216 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
3217 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3218 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
3219 }
3220 }
3221
3222 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3223 kfree(buff);
3224 return ret;
3225 }
3226
3227 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3228 .write = rs_sta_dbgfs_scale_table_write,
3229 .read = rs_sta_dbgfs_scale_table_read,
3230 .open = open_file_generic,
3231 .llseek = default_llseek,
3232 };
3233 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3234 char __user *user_buf, size_t count, loff_t *ppos)
3235 {
3236 char *buff;
3237 int desc = 0;
3238 int i, j;
3239 ssize_t ret;
3240
3241 struct iwl_lq_sta *lq_sta = file->private_data;
3242
3243 buff = kmalloc(1024, GFP_KERNEL);
3244 if (!buff)
3245 return -ENOMEM;
3246
3247 for (i = 0; i < LQ_SIZE; i++) {
3248 desc += sprintf(buff+desc,
3249 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
3250 "rate=0x%X\n",
3251 lq_sta->active_tbl == i ? "*" : "x",
3252 lq_sta->lq_info[i].lq_type,
3253 lq_sta->lq_info[i].is_SGI,
3254 lq_sta->lq_info[i].is_ht40,
3255 lq_sta->lq_info[i].is_dup,
3256 lq_sta->is_green,
3257 lq_sta->lq_info[i].current_rate);
3258 for (j = 0; j < IWL_RATE_COUNT; j++) {
3259 desc += sprintf(buff+desc,
3260 "counter=%d success=%d %%=%d\n",
3261 lq_sta->lq_info[i].win[j].counter,
3262 lq_sta->lq_info[i].win[j].success_counter,
3263 lq_sta->lq_info[i].win[j].success_ratio);
3264 }
3265 }
3266 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3267 kfree(buff);
3268 return ret;
3269 }
3270
3271 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3272 .read = rs_sta_dbgfs_stats_table_read,
3273 .open = open_file_generic,
3274 .llseek = default_llseek,
3275 };
3276
3277 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3278 char __user *user_buf, size_t count, loff_t *ppos)
3279 {
3280 struct iwl_lq_sta *lq_sta = file->private_data;
3281 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3282 char buff[120];
3283 int desc = 0;
3284
3285 if (is_Ht(tbl->lq_type))
3286 desc += sprintf(buff+desc,
3287 "Bit Rate= %d Mb/s\n",
3288 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3289 else
3290 desc += sprintf(buff+desc,
3291 "Bit Rate= %d Mb/s\n",
3292 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3293
3294 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3295 }
3296
3297 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3298 .read = rs_sta_dbgfs_rate_scale_data_read,
3299 .open = open_file_generic,
3300 .llseek = default_llseek,
3301 };
3302
3303 static void rs_add_debugfs(void *priv, void *priv_sta,
3304 struct dentry *dir)
3305 {
3306 struct iwl_lq_sta *lq_sta = priv_sta;
3307 lq_sta->rs_sta_dbgfs_scale_table_file =
3308 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3309 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3310 lq_sta->rs_sta_dbgfs_stats_table_file =
3311 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3312 lq_sta, &rs_sta_dbgfs_stats_table_ops);
3313 lq_sta->rs_sta_dbgfs_rate_scale_data_file =
3314 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
3315 lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
3316 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
3317 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3318 &lq_sta->tx_agg_tid_en);
3319
3320 }
3321
3322 static void rs_remove_debugfs(void *priv, void *priv_sta)
3323 {
3324 struct iwl_lq_sta *lq_sta = priv_sta;
3325 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3326 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
3327 debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
3328 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
3329 }
3330 #endif
3331
3332 /*
3333 * Initialization of rate scaling information is done by driver after
3334 * the station is added. Since mac80211 calls this function before a
3335 * station is added we ignore it.
3336 */
3337 static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband,
3338 struct ieee80211_sta *sta, void *priv_sta)
3339 {
3340 }
3341 static struct rate_control_ops rs_ops = {
3342 .module = NULL,
3343 .name = RS_NAME,
3344 .tx_status = rs_tx_status,
3345 .get_rate = rs_get_rate,
3346 .rate_init = rs_rate_init_stub,
3347 .alloc = rs_alloc,
3348 .free = rs_free,
3349 .alloc_sta = rs_alloc_sta,
3350 .free_sta = rs_free_sta,
3351 #ifdef CONFIG_MAC80211_DEBUGFS
3352 .add_sta_debugfs = rs_add_debugfs,
3353 .remove_sta_debugfs = rs_remove_debugfs,
3354 #endif
3355 };
3356
3357 int iwlagn_rate_control_register(void)
3358 {
3359 return ieee80211_rate_control_register(&rs_ops);
3360 }
3361
3362 void iwlagn_rate_control_unregister(void)
3363 {
3364 ieee80211_rate_control_unregister(&rs_ops);
3365 }
3366
linux-next