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fix a kmap leak in virtio_console
[linux/fpc-iii.git] / drivers / net / wireless / iwlwifi / dvm / rs.c
blob0977d93b529d3ce11fde93ac1e1c4ff626415a13
1 /******************************************************************************
2 *
3 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2 of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
17 *
18 * The full GNU General Public License is included in this distribution in the
19 * file called LICENSE.
20 *
21 * Contact Information:
22 * Intel Linux Wireless <ilw@linux.intel.com>
23 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
24 *
25 *****************************************************************************/
26 #include <linux/kernel.h>
27 #include <linux/skbuff.h>
28 #include <linux/slab.h>
29 #include <net/mac80211.h>
30
31 #include <linux/netdevice.h>
32 #include <linux/etherdevice.h>
33 #include <linux/delay.h>
34
35 #include <linux/workqueue.h>
36
37 #include "dev.h"
38 #include "agn.h"
39
40 #define RS_NAME "iwl-agn-rs"
41
42 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
43 #define IWL_NUMBER_TRY 1
44 #define IWL_HT_NUMBER_TRY 3
45
46 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
47 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
48 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
49
50 /* max allowed rate miss before sync LQ cmd */
51 #define IWL_MISSED_RATE_MAX 15
52 /* max time to accum history 2 seconds */
53 #define IWL_RATE_SCALE_FLUSH_INTVL (3*HZ)
54
55 static u8 rs_ht_to_legacy[] = {
56 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
57 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
58 IWL_RATE_6M_INDEX,
59 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
60 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
61 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
62 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
63 };
64
65 static const u8 ant_toggle_lookup[] = {
66 /*ANT_NONE -> */ ANT_NONE,
67 /*ANT_A -> */ ANT_B,
68 /*ANT_B -> */ ANT_C,
69 /*ANT_AB -> */ ANT_BC,
70 /*ANT_C -> */ ANT_A,
71 /*ANT_AC -> */ ANT_AB,
72 /*ANT_BC -> */ ANT_AC,
73 /*ANT_ABC -> */ ANT_ABC,
74 };
75
76 #define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np) \
77 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
78 IWL_RATE_SISO_##s##M_PLCP, \
79 IWL_RATE_MIMO2_##s##M_PLCP,\
80 IWL_RATE_MIMO3_##s##M_PLCP,\
81 IWL_RATE_##r##M_IEEE, \
82 IWL_RATE_##ip##M_INDEX, \
83 IWL_RATE_##in##M_INDEX, \
84 IWL_RATE_##rp##M_INDEX, \
85 IWL_RATE_##rn##M_INDEX, \
86 IWL_RATE_##pp##M_INDEX, \
87 IWL_RATE_##np##M_INDEX }
88
89 /*
90 * Parameter order:
91 * rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
92 *
93 * If there isn't a valid next or previous rate then INV is used which
94 * maps to IWL_RATE_INVALID
95 *
96 */
97 const struct iwl_rate_info iwl_rates[IWL_RATE_COUNT] = {
98 IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2), /* 1mbps */
99 IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5), /* 2mbps */
100 IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11), /*5.5mbps */
101 IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18), /* 11mbps */
102 IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11), /* 6mbps */
103 IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11), /* 9mbps */
104 IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18), /* 12mbps */
105 IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24), /* 18mbps */
106 IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36), /* 24mbps */
107 IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48), /* 36mbps */
108 IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54), /* 48mbps */
109 IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
110 IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
111 /* FIXME:RS: ^^ should be INV (legacy) */
112 };
113
114 static inline u8 rs_extract_rate(u32 rate_n_flags)
115 {
116 return (u8)(rate_n_flags & RATE_MCS_RATE_MSK);
117 }
118
119 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
120 {
121 int idx = 0;
122
123 /* HT rate format */
124 if (rate_n_flags & RATE_MCS_HT_MSK) {
125 idx = rs_extract_rate(rate_n_flags);
126
127 if (idx >= IWL_RATE_MIMO3_6M_PLCP)
128 idx = idx - IWL_RATE_MIMO3_6M_PLCP;
129 else if (idx >= IWL_RATE_MIMO2_6M_PLCP)
130 idx = idx - IWL_RATE_MIMO2_6M_PLCP;
131
132 idx += IWL_FIRST_OFDM_RATE;
133 /* skip 9M not supported in ht*/
134 if (idx >= IWL_RATE_9M_INDEX)
135 idx += 1;
136 if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE))
137 return idx;
138
139 /* legacy rate format, search for match in table */
140 } else {
141 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
142 if (iwl_rates[idx].plcp ==
143 rs_extract_rate(rate_n_flags))
144 return idx;
145 }
146
147 return -1;
148 }
149
150 static void rs_rate_scale_perform(struct iwl_priv *priv,
151 struct sk_buff *skb,
152 struct ieee80211_sta *sta,
153 struct iwl_lq_sta *lq_sta);
154 static void rs_fill_link_cmd(struct iwl_priv *priv,
155 struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
156 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
157
158
159 #ifdef CONFIG_MAC80211_DEBUGFS
160 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
161 u32 *rate_n_flags, int index);
162 #else
163 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
164 u32 *rate_n_flags, int index)
165 {}
166 #endif
167
168 /**
169 * The following tables contain the expected throughput metrics for all rates
170 *
171 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
172 *
173 * where invalid entries are zeros.
174 *
175 * CCK rates are only valid in legacy table and will only be used in G
176 * (2.4 GHz) band.
177 */
178
179 static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
180 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
181 };
182
183 static s32 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
184 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202}, /* Norm */
185 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210}, /* SGI */
186 {0, 0, 0, 0, 47, 0, 91, 133, 171, 242, 305, 334, 362}, /* AGG */
187 {0, 0, 0, 0, 52, 0, 101, 145, 187, 264, 330, 361, 390}, /* AGG+SGI */
188 };
189
190 static s32 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
191 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
192 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
193 {0, 0, 0, 0, 94, 0, 177, 249, 313, 423, 512, 550, 586}, /* AGG */
194 {0, 0, 0, 0, 104, 0, 193, 270, 338, 454, 545, 584, 620}, /* AGG+SGI */
195 };
196
197 static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
198 {0, 0, 0, 0, 74, 0, 123, 155, 179, 214, 236, 244, 251}, /* Norm */
199 {0, 0, 0, 0, 81, 0, 131, 164, 188, 223, 243, 251, 257}, /* SGI */
200 {0, 0, 0, 0, 89, 0, 167, 235, 296, 402, 488, 526, 560}, /* AGG */
201 {0, 0, 0, 0, 97, 0, 182, 255, 320, 431, 520, 558, 593}, /* AGG+SGI*/
202 };
203
204 static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
205 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
206 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
207 {0, 0, 0, 0, 171, 0, 305, 410, 496, 634, 731, 771, 805}, /* AGG */
208 {0, 0, 0, 0, 186, 0, 329, 439, 527, 667, 764, 803, 838}, /* AGG+SGI */
209 };
210
211 static s32 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = {
212 {0, 0, 0, 0, 99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */
213 {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */
214 {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */
215 {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */
216 };
217
218 static s32 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = {
219 {0, 0, 0, 0, 152, 0, 211, 239, 255, 279, 290, 294, 297}, /* Norm */
220 {0, 0, 0, 0, 160, 0, 219, 245, 261, 284, 294, 297, 300}, /* SGI */
221 {0, 0, 0, 0, 254, 0, 443, 584, 695, 868, 984, 1030, 1070}, /* AGG */
222 {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */
223 };
224
225 /* mbps, mcs */
226 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
227 { "1", "BPSK DSSS"},
228 { "2", "QPSK DSSS"},
229 {"5.5", "BPSK CCK"},
230 { "11", "QPSK CCK"},
231 { "6", "BPSK 1/2"},
232 { "9", "BPSK 1/2"},
233 { "12", "QPSK 1/2"},
234 { "18", "QPSK 3/4"},
235 { "24", "16QAM 1/2"},
236 { "36", "16QAM 3/4"},
237 { "48", "64QAM 2/3"},
238 { "54", "64QAM 3/4"},
239 { "60", "64QAM 5/6"},
240 };
241
242 #define MCS_INDEX_PER_STREAM (8)
243
244 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
245 {
246 window->data = 0;
247 window->success_counter = 0;
248 window->success_ratio = IWL_INVALID_VALUE;
249 window->counter = 0;
250 window->average_tpt = IWL_INVALID_VALUE;
251 window->stamp = 0;
252 }
253
254 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
255 {
256 return (ant_type & valid_antenna) == ant_type;
257 }
258
259 /*
260 * removes the old data from the statistics. All data that is older than
261 * TID_MAX_TIME_DIFF, will be deleted.
262 */
263 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
264 {
265 /* The oldest age we want to keep */
266 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
267
268 while (tl->queue_count &&
269 (tl->time_stamp < oldest_time)) {
270 tl->total -= tl->packet_count[tl->head];
271 tl->packet_count[tl->head] = 0;
272 tl->time_stamp += TID_QUEUE_CELL_SPACING;
273 tl->queue_count--;
274 tl->head++;
275 if (tl->head >= TID_QUEUE_MAX_SIZE)
276 tl->head = 0;
277 }
278 }
279
280 /*
281 * increment traffic load value for tid and also remove
282 * any old values if passed the certain time period
283 */
284 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
285 struct ieee80211_hdr *hdr)
286 {
287 u32 curr_time = jiffies_to_msecs(jiffies);
288 u32 time_diff;
289 s32 index;
290 struct iwl_traffic_load *tl = NULL;
291 u8 tid;
292
293 if (ieee80211_is_data_qos(hdr->frame_control)) {
294 u8 *qc = ieee80211_get_qos_ctl(hdr);
295 tid = qc[0] & 0xf;
296 } else
297 return IWL_MAX_TID_COUNT;
298
299 if (unlikely(tid >= IWL_MAX_TID_COUNT))
300 return IWL_MAX_TID_COUNT;
301
302 tl = &lq_data->load[tid];
303
304 curr_time -= curr_time % TID_ROUND_VALUE;
305
306 /* Happens only for the first packet. Initialize the data */
307 if (!(tl->queue_count)) {
308 tl->total = 1;
309 tl->time_stamp = curr_time;
310 tl->queue_count = 1;
311 tl->head = 0;
312 tl->packet_count[0] = 1;
313 return IWL_MAX_TID_COUNT;
314 }
315
316 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
317 index = time_diff / TID_QUEUE_CELL_SPACING;
318
319 /* The history is too long: remove data that is older than */
320 /* TID_MAX_TIME_DIFF */
321 if (index >= TID_QUEUE_MAX_SIZE)
322 rs_tl_rm_old_stats(tl, curr_time);
323
324 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
325 tl->packet_count[index] = tl->packet_count[index] + 1;
326 tl->total = tl->total + 1;
327
328 if ((index + 1) > tl->queue_count)
329 tl->queue_count = index + 1;
330
331 return tid;
332 }
333
334 #ifdef CONFIG_MAC80211_DEBUGFS
335 /**
336 * Program the device to use fixed rate for frame transmit
337 * This is for debugging/testing only
338 * once the device start use fixed rate, we need to reload the module
339 * to being back the normal operation.
340 */
341 static void rs_program_fix_rate(struct iwl_priv *priv,
342 struct iwl_lq_sta *lq_sta)
343 {
344 struct iwl_station_priv *sta_priv =
345 container_of(lq_sta, struct iwl_station_priv, lq_sta);
346 struct iwl_rxon_context *ctx = sta_priv->ctx;
347
348 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
349 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
350 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
351 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
352
353 IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
354 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
355
356 if (lq_sta->dbg_fixed_rate) {
357 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
358 iwl_send_lq_cmd(lq_sta->drv, ctx, &lq_sta->lq, CMD_ASYNC,
359 false);
360 }
361 }
362 #endif
363
364 /*
365 get the traffic load value for tid
366 */
367 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
368 {
369 u32 curr_time = jiffies_to_msecs(jiffies);
370 u32 time_diff;
371 s32 index;
372 struct iwl_traffic_load *tl = NULL;
373
374 if (tid >= IWL_MAX_TID_COUNT)
375 return 0;
376
377 tl = &(lq_data->load[tid]);
378
379 curr_time -= curr_time % TID_ROUND_VALUE;
380
381 if (!(tl->queue_count))
382 return 0;
383
384 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
385 index = time_diff / TID_QUEUE_CELL_SPACING;
386
387 /* The history is too long: remove data that is older than */
388 /* TID_MAX_TIME_DIFF */
389 if (index >= TID_QUEUE_MAX_SIZE)
390 rs_tl_rm_old_stats(tl, curr_time);
391
392 return tl->total;
393 }
394
395 static int rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
396 struct iwl_lq_sta *lq_data, u8 tid,
397 struct ieee80211_sta *sta)
398 {
399 int ret = -EAGAIN;
400 u32 load;
401
402 /*
403 * Don't create TX aggregation sessions when in high
404 * BT traffic, as they would just be disrupted by BT.
405 */
406 if (priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) {
407 IWL_DEBUG_COEX(priv,
408 "BT traffic (%d), no aggregation allowed\n",
409 priv->bt_traffic_load);
410 return ret;
411 }
412
413 load = rs_tl_get_load(lq_data, tid);
414
415 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
416 sta->addr, tid);
417 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
418 if (ret == -EAGAIN) {
419 /*
420 * driver and mac80211 is out of sync
421 * this might be cause by reloading firmware
422 * stop the tx ba session here
423 */
424 IWL_ERR(priv, "Fail start Tx agg on tid: %d\n",
425 tid);
426 ieee80211_stop_tx_ba_session(sta, tid);
427 }
428 return ret;
429 }
430
431 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
432 struct iwl_lq_sta *lq_data,
433 struct ieee80211_sta *sta)
434 {
435 if (tid < IWL_MAX_TID_COUNT)
436 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
437 else
438 IWL_ERR(priv, "tid exceeds max TID count: %d/%d\n",
439 tid, IWL_MAX_TID_COUNT);
440 }
441
442 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
443 {
444 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
445 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
446 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
447 }
448
449 /*
450 * Static function to get the expected throughput from an iwl_scale_tbl_info
451 * that wraps a NULL pointer check
452 */
453 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
454 {
455 if (tbl->expected_tpt)
456 return tbl->expected_tpt[rs_index];
457 return 0;
458 }
459
460 /**
461 * rs_collect_tx_data - Update the success/failure sliding window
462 *
463 * We keep a sliding window of the last 62 packets transmitted
464 * at this rate. window->data contains the bitmask of successful
465 * packets.
466 */
467 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
468 int scale_index, int attempts, int successes)
469 {
470 struct iwl_rate_scale_data *window = NULL;
471 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
472 s32 fail_count, tpt;
473
474 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
475 return -EINVAL;
476
477 /* Select window for current tx bit rate */
478 window = &(tbl->win[scale_index]);
479
480 /* Get expected throughput */
481 tpt = get_expected_tpt(tbl, scale_index);
482
483 /*
484 * Keep track of only the latest 62 tx frame attempts in this rate's
485 * history window; anything older isn't really relevant any more.
486 * If we have filled up the sliding window, drop the oldest attempt;
487 * if the oldest attempt (highest bit in bitmap) shows "success",
488 * subtract "1" from the success counter (this is the main reason
489 * we keep these bitmaps!).
490 */
491 while (attempts > 0) {
492 if (window->counter >= IWL_RATE_MAX_WINDOW) {
493
494 /* remove earliest */
495 window->counter = IWL_RATE_MAX_WINDOW - 1;
496
497 if (window->data & mask) {
498 window->data &= ~mask;
499 window->success_counter--;
500 }
501 }
502
503 /* Increment frames-attempted counter */
504 window->counter++;
505
506 /* Shift bitmap by one frame to throw away oldest history */
507 window->data <<= 1;
508
509 /* Mark the most recent #successes attempts as successful */
510 if (successes > 0) {
511 window->success_counter++;
512 window->data |= 0x1;
513 successes--;
514 }
515
516 attempts--;
517 }
518
519 /* Calculate current success ratio, avoid divide-by-0! */
520 if (window->counter > 0)
521 window->success_ratio = 128 * (100 * window->success_counter)
522 / window->counter;
523 else
524 window->success_ratio = IWL_INVALID_VALUE;
525
526 fail_count = window->counter - window->success_counter;
527
528 /* Calculate average throughput, if we have enough history. */
529 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
530 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
531 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
532 else
533 window->average_tpt = IWL_INVALID_VALUE;
534
535 /* Tag this window as having been updated */
536 window->stamp = jiffies;
537
538 return 0;
539 }
540
541 /*
542 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
543 */
544 /* FIXME:RS:remove this function and put the flags statically in the table */
545 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
546 struct iwl_scale_tbl_info *tbl,
547 int index, u8 use_green)
548 {
549 u32 rate_n_flags = 0;
550
551 if (is_legacy(tbl->lq_type)) {
552 rate_n_flags = iwl_rates[index].plcp;
553 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
554 rate_n_flags |= RATE_MCS_CCK_MSK;
555
556 } else if (is_Ht(tbl->lq_type)) {
557 if (index > IWL_LAST_OFDM_RATE) {
558 IWL_ERR(priv, "Invalid HT rate index %d\n", index);
559 index = IWL_LAST_OFDM_RATE;
560 }
561 rate_n_flags = RATE_MCS_HT_MSK;
562
563 if (is_siso(tbl->lq_type))
564 rate_n_flags |= iwl_rates[index].plcp_siso;
565 else if (is_mimo2(tbl->lq_type))
566 rate_n_flags |= iwl_rates[index].plcp_mimo2;
567 else
568 rate_n_flags |= iwl_rates[index].plcp_mimo3;
569 } else {
570 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
571 }
572
573 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
574 RATE_MCS_ANT_ABC_MSK);
575
576 if (is_Ht(tbl->lq_type)) {
577 if (tbl->is_ht40) {
578 if (tbl->is_dup)
579 rate_n_flags |= RATE_MCS_DUP_MSK;
580 else
581 rate_n_flags |= RATE_MCS_HT40_MSK;
582 }
583 if (tbl->is_SGI)
584 rate_n_flags |= RATE_MCS_SGI_MSK;
585
586 if (use_green) {
587 rate_n_flags |= RATE_MCS_GF_MSK;
588 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
589 rate_n_flags &= ~RATE_MCS_SGI_MSK;
590 IWL_ERR(priv, "GF was set with SGI:SISO\n");
591 }
592 }
593 }
594 return rate_n_flags;
595 }
596
597 /*
598 * Interpret uCode API's rate_n_flags format,
599 * fill "search" or "active" tx mode table.
600 */
601 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
602 enum ieee80211_band band,
603 struct iwl_scale_tbl_info *tbl,
604 int *rate_idx)
605 {
606 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
607 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
608 u8 mcs;
609
610 memset(tbl, 0, sizeof(struct iwl_scale_tbl_info));
611 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
612
613 if (*rate_idx == IWL_RATE_INVALID) {
614 *rate_idx = -1;
615 return -EINVAL;
616 }
617 tbl->is_SGI = 0; /* default legacy setup */
618 tbl->is_ht40 = 0;
619 tbl->is_dup = 0;
620 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
621 tbl->lq_type = LQ_NONE;
622 tbl->max_search = IWL_MAX_SEARCH;
623
624 /* legacy rate format */
625 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
626 if (num_of_ant == 1) {
627 if (band == IEEE80211_BAND_5GHZ)
628 tbl->lq_type = LQ_A;
629 else
630 tbl->lq_type = LQ_G;
631 }
632 /* HT rate format */
633 } else {
634 if (rate_n_flags & RATE_MCS_SGI_MSK)
635 tbl->is_SGI = 1;
636
637 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
638 (rate_n_flags & RATE_MCS_DUP_MSK))
639 tbl->is_ht40 = 1;
640
641 if (rate_n_flags & RATE_MCS_DUP_MSK)
642 tbl->is_dup = 1;
643
644 mcs = rs_extract_rate(rate_n_flags);
645
646 /* SISO */
647 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
648 if (num_of_ant == 1)
649 tbl->lq_type = LQ_SISO; /*else NONE*/
650 /* MIMO2 */
651 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
652 if (num_of_ant == 2)
653 tbl->lq_type = LQ_MIMO2;
654 /* MIMO3 */
655 } else {
656 if (num_of_ant == 3) {
657 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
658 tbl->lq_type = LQ_MIMO3;
659 }
660 }
661 }
662 return 0;
663 }
664
665 /* switch to another antenna/antennas and return 1 */
666 /* if no other valid antenna found, return 0 */
667 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
668 struct iwl_scale_tbl_info *tbl)
669 {
670 u8 new_ant_type;
671
672 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
673 return 0;
674
675 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
676 return 0;
677
678 new_ant_type = ant_toggle_lookup[tbl->ant_type];
679
680 while ((new_ant_type != tbl->ant_type) &&
681 !rs_is_valid_ant(valid_ant, new_ant_type))
682 new_ant_type = ant_toggle_lookup[new_ant_type];
683
684 if (new_ant_type == tbl->ant_type)
685 return 0;
686
687 tbl->ant_type = new_ant_type;
688 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
689 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
690 return 1;
691 }
692
693 /**
694 * Green-field mode is valid if the station supports it and
695 * there are no non-GF stations present in the BSS.
696 */
697 static bool rs_use_green(struct ieee80211_sta *sta)
698 {
699 /*
700 * There's a bug somewhere in this code that causes the
701 * scaling to get stuck because GF+SGI can't be combined
702 * in SISO rates. Until we find that bug, disable GF, it
703 * has only limited benefit and we still interoperate with
704 * GF APs since we can always receive GF transmissions.
705 */
706 return false;
707 }
708
709 /**
710 * rs_get_supported_rates - get the available rates
711 *
712 * if management frame or broadcast frame only return
713 * basic available rates.
714 *
715 */
716 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
717 struct ieee80211_hdr *hdr,
718 enum iwl_table_type rate_type)
719 {
720 if (is_legacy(rate_type)) {
721 return lq_sta->active_legacy_rate;
722 } else {
723 if (is_siso(rate_type))
724 return lq_sta->active_siso_rate;
725 else if (is_mimo2(rate_type))
726 return lq_sta->active_mimo2_rate;
727 else
728 return lq_sta->active_mimo3_rate;
729 }
730 }
731
732 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
733 int rate_type)
734 {
735 u8 high = IWL_RATE_INVALID;
736 u8 low = IWL_RATE_INVALID;
737
738 /* 802.11A or ht walks to the next literal adjacent rate in
739 * the rate table */
740 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
741 int i;
742 u32 mask;
743
744 /* Find the previous rate that is in the rate mask */
745 i = index - 1;
746 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
747 if (rate_mask & mask) {
748 low = i;
749 break;
750 }
751 }
752
753 /* Find the next rate that is in the rate mask */
754 i = index + 1;
755 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
756 if (rate_mask & mask) {
757 high = i;
758 break;
759 }
760 }
761
762 return (high << 8) | low;
763 }
764
765 low = index;
766 while (low != IWL_RATE_INVALID) {
767 low = iwl_rates[low].prev_rs;
768 if (low == IWL_RATE_INVALID)
769 break;
770 if (rate_mask & (1 << low))
771 break;
772 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
773 }
774
775 high = index;
776 while (high != IWL_RATE_INVALID) {
777 high = iwl_rates[high].next_rs;
778 if (high == IWL_RATE_INVALID)
779 break;
780 if (rate_mask & (1 << high))
781 break;
782 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
783 }
784
785 return (high << 8) | low;
786 }
787
788 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
789 struct iwl_scale_tbl_info *tbl,
790 u8 scale_index, u8 ht_possible)
791 {
792 s32 low;
793 u16 rate_mask;
794 u16 high_low;
795 u8 switch_to_legacy = 0;
796 u8 is_green = lq_sta->is_green;
797 struct iwl_priv *priv = lq_sta->drv;
798
799 /* check if we need to switch from HT to legacy rates.
800 * assumption is that mandatory rates (1Mbps or 6Mbps)
801 * are always supported (spec demand) */
802 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
803 switch_to_legacy = 1;
804 scale_index = rs_ht_to_legacy[scale_index];
805 if (lq_sta->band == IEEE80211_BAND_5GHZ)
806 tbl->lq_type = LQ_A;
807 else
808 tbl->lq_type = LQ_G;
809
810 if (num_of_ant(tbl->ant_type) > 1)
811 tbl->ant_type =
812 first_antenna(priv->nvm_data->valid_tx_ant);
813
814 tbl->is_ht40 = 0;
815 tbl->is_SGI = 0;
816 tbl->max_search = IWL_MAX_SEARCH;
817 }
818
819 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
820
821 /* Mask with station rate restriction */
822 if (is_legacy(tbl->lq_type)) {
823 /* supp_rates has no CCK bits in A mode */
824 if (lq_sta->band == IEEE80211_BAND_5GHZ)
825 rate_mask = (u16)(rate_mask &
826 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
827 else
828 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
829 }
830
831 /* If we switched from HT to legacy, check current rate */
832 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
833 low = scale_index;
834 goto out;
835 }
836
837 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
838 tbl->lq_type);
839 low = high_low & 0xff;
840
841 if (low == IWL_RATE_INVALID)
842 low = scale_index;
843
844 out:
845 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
846 }
847
848 /*
849 * Simple function to compare two rate scale table types
850 */
851 static bool table_type_matches(struct iwl_scale_tbl_info *a,
852 struct iwl_scale_tbl_info *b)
853 {
854 return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
855 (a->is_SGI == b->is_SGI);
856 }
857
858 static void rs_bt_update_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
859 struct iwl_lq_sta *lq_sta)
860 {
861 struct iwl_scale_tbl_info *tbl;
862 bool full_concurrent = priv->bt_full_concurrent;
863
864 if (priv->bt_ant_couple_ok) {
865 /*
866 * Is there a need to switch between
867 * full concurrency and 3-wire?
868 */
869 if (priv->bt_ci_compliance && priv->bt_ant_couple_ok)
870 full_concurrent = true;
871 else
872 full_concurrent = false;
873 }
874 if ((priv->bt_traffic_load != priv->last_bt_traffic_load) ||
875 (priv->bt_full_concurrent != full_concurrent)) {
876 priv->bt_full_concurrent = full_concurrent;
877 priv->last_bt_traffic_load = priv->bt_traffic_load;
878
879 /* Update uCode's rate table. */
880 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
881 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
882 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
883
884 queue_work(priv->workqueue, &priv->bt_full_concurrency);
885 }
886 }
887
888 /*
889 * mac80211 sends us Tx status
890 */
891 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
892 struct ieee80211_sta *sta, void *priv_sta,
893 struct sk_buff *skb)
894 {
895 int legacy_success;
896 int retries;
897 int rs_index, mac_index, i;
898 struct iwl_lq_sta *lq_sta = priv_sta;
899 struct iwl_link_quality_cmd *table;
900 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
901 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)priv_r;
902 struct iwl_priv *priv = IWL_OP_MODE_GET_DVM(op_mode);
903 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
904 enum mac80211_rate_control_flags mac_flags;
905 u32 tx_rate;
906 struct iwl_scale_tbl_info tbl_type;
907 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
908 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
909 struct iwl_rxon_context *ctx = sta_priv->ctx;
910
911 IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
912
913 /* Treat uninitialized rate scaling data same as non-existing. */
914 if (!lq_sta) {
915 IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n");
916 return;
917 } else if (!lq_sta->drv) {
918 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
919 return;
920 }
921
922 if (!ieee80211_is_data(hdr->frame_control) ||
923 info->flags & IEEE80211_TX_CTL_NO_ACK)
924 return;
925
926 /* This packet was aggregated but doesn't carry status info */
927 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
928 !(info->flags & IEEE80211_TX_STAT_AMPDU))
929 return;
930
931 /*
932 * Ignore this Tx frame response if its initial rate doesn't match
933 * that of latest Link Quality command. There may be stragglers
934 * from a previous Link Quality command, but we're no longer interested
935 * in those; they're either from the "active" mode while we're trying
936 * to check "search" mode, or a prior "search" mode after we've moved
937 * to a new "search" mode (which might become the new "active" mode).
938 */
939 table = &lq_sta->lq;
940 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
941 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
942 if (priv->band == IEEE80211_BAND_5GHZ)
943 rs_index -= IWL_FIRST_OFDM_RATE;
944 mac_flags = info->status.rates[0].flags;
945 mac_index = info->status.rates[0].idx;
946 /* For HT packets, map MCS to PLCP */
947 if (mac_flags & IEEE80211_TX_RC_MCS) {
948 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
949 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
950 mac_index++;
951 /*
952 * mac80211 HT index is always zero-indexed; we need to move
953 * HT OFDM rates after CCK rates in 2.4 GHz band
954 */
955 if (priv->band == IEEE80211_BAND_2GHZ)
956 mac_index += IWL_FIRST_OFDM_RATE;
957 }
958 /* Here we actually compare this rate to the latest LQ command */
959 if ((mac_index < 0) ||
960 (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
961 (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
962 (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
963 (tbl_type.ant_type != info->status.antenna) ||
964 (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
965 (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
966 (rs_index != mac_index)) {
967 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate);
968 /*
969 * Since rates mis-match, the last LQ command may have failed.
970 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
971 * ... driver.
972 */
973 lq_sta->missed_rate_counter++;
974 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
975 lq_sta->missed_rate_counter = 0;
976 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
977 }
978 /* Regardless, ignore this status info for outdated rate */
979 return;
980 } else
981 /* Rate did match, so reset the missed_rate_counter */
982 lq_sta->missed_rate_counter = 0;
983
984 /* Figure out if rate scale algorithm is in active or search table */
985 if (table_type_matches(&tbl_type,
986 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
987 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
988 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
989 } else if (table_type_matches(&tbl_type,
990 &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
991 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
992 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
993 } else {
994 IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n");
995 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
996 IWL_DEBUG_RATE(priv, "active- lq:%x, ant:%x, SGI:%d\n",
997 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
998 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
999 IWL_DEBUG_RATE(priv, "search- lq:%x, ant:%x, SGI:%d\n",
1000 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
1001 IWL_DEBUG_RATE(priv, "actual- lq:%x, ant:%x, SGI:%d\n",
1002 tbl_type.lq_type, tbl_type.ant_type, tbl_type.is_SGI);
1003 /*
1004 * no matching table found, let's by-pass the data collection
1005 * and continue to perform rate scale to find the rate table
1006 */
1007 rs_stay_in_table(lq_sta, true);
1008 goto done;
1009 }
1010
1011 /*
1012 * Updating the frame history depends on whether packets were
1013 * aggregated.
1014 *
1015 * For aggregation, all packets were transmitted at the same rate, the
1016 * first index into rate scale table.
1017 */
1018 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1019 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
1020 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
1021 &rs_index);
1022 rs_collect_tx_data(curr_tbl, rs_index,
1023 info->status.ampdu_len,
1024 info->status.ampdu_ack_len);
1025
1026 /* Update success/fail counts if not searching for new mode */
1027 if (lq_sta->stay_in_tbl) {
1028 lq_sta->total_success += info->status.ampdu_ack_len;
1029 lq_sta->total_failed += (info->status.ampdu_len -
1030 info->status.ampdu_ack_len);
1031 }
1032 } else {
1033 /*
1034 * For legacy, update frame history with for each Tx retry.
1035 */
1036 retries = info->status.rates[0].count - 1;
1037 /* HW doesn't send more than 15 retries */
1038 retries = min(retries, 15);
1039
1040 /* The last transmission may have been successful */
1041 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1042 /* Collect data for each rate used during failed TX attempts */
1043 for (i = 0; i <= retries; ++i) {
1044 tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
1045 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
1046 &tbl_type, &rs_index);
1047 /*
1048 * Only collect stats if retried rate is in the same RS
1049 * table as active/search.
1050 */
1051 if (table_type_matches(&tbl_type, curr_tbl))
1052 tmp_tbl = curr_tbl;
1053 else if (table_type_matches(&tbl_type, other_tbl))
1054 tmp_tbl = other_tbl;
1055 else
1056 continue;
1057 rs_collect_tx_data(tmp_tbl, rs_index, 1,
1058 i < retries ? 0 : legacy_success);
1059 }
1060
1061 /* Update success/fail counts if not searching for new mode */
1062 if (lq_sta->stay_in_tbl) {
1063 lq_sta->total_success += legacy_success;
1064 lq_sta->total_failed += retries + (1 - legacy_success);
1065 }
1066 }
1067 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1068 lq_sta->last_rate_n_flags = tx_rate;
1069 done:
1070 /* See if there's a better rate or modulation mode to try. */
1071 if (sta && sta->supp_rates[sband->band])
1072 rs_rate_scale_perform(priv, skb, sta, lq_sta);
1073
1074 if (priv->lib->bt_params && priv->lib->bt_params->advanced_bt_coexist)
1075 rs_bt_update_lq(priv, ctx, lq_sta);
1076 }
1077
1078 /*
1079 * Begin a period of staying with a selected modulation mode.
1080 * Set "stay_in_tbl" flag to prevent any mode switches.
1081 * Set frame tx success limits according to legacy vs. high-throughput,
1082 * and reset overall (spanning all rates) tx success history statistics.
1083 * These control how long we stay using same modulation mode before
1084 * searching for a new mode.
1085 */
1086 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
1087 struct iwl_lq_sta *lq_sta)
1088 {
1089 IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
1090 lq_sta->stay_in_tbl = 1; /* only place this gets set */
1091 if (is_legacy) {
1092 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1093 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1094 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1095 } else {
1096 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1097 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1098 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1099 }
1100 lq_sta->table_count = 0;
1101 lq_sta->total_failed = 0;
1102 lq_sta->total_success = 0;
1103 lq_sta->flush_timer = jiffies;
1104 lq_sta->action_counter = 0;
1105 }
1106
1107 /*
1108 * Find correct throughput table for given mode of modulation
1109 */
1110 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1111 struct iwl_scale_tbl_info *tbl)
1112 {
1113 /* Used to choose among HT tables */
1114 s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1115
1116 /* Check for invalid LQ type */
1117 if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1118 tbl->expected_tpt = expected_tpt_legacy;
1119 return;
1120 }
1121
1122 /* Legacy rates have only one table */
1123 if (is_legacy(tbl->lq_type)) {
1124 tbl->expected_tpt = expected_tpt_legacy;
1125 return;
1126 }
1127
1128 /* Choose among many HT tables depending on number of streams
1129 * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
1130 * status */
1131 if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1132 ht_tbl_pointer = expected_tpt_siso20MHz;
1133 else if (is_siso(tbl->lq_type))
1134 ht_tbl_pointer = expected_tpt_siso40MHz;
1135 else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1136 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1137 else if (is_mimo2(tbl->lq_type))
1138 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1139 else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1140 ht_tbl_pointer = expected_tpt_mimo3_20MHz;
1141 else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
1142 ht_tbl_pointer = expected_tpt_mimo3_40MHz;
1143
1144 if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */
1145 tbl->expected_tpt = ht_tbl_pointer[0];
1146 else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */
1147 tbl->expected_tpt = ht_tbl_pointer[1];
1148 else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */
1149 tbl->expected_tpt = ht_tbl_pointer[2];
1150 else /* AGG+SGI */
1151 tbl->expected_tpt = ht_tbl_pointer[3];
1152 }
1153
1154 /*
1155 * Find starting rate for new "search" high-throughput mode of modulation.
1156 * Goal is to find lowest expected rate (under perfect conditions) that is
1157 * above the current measured throughput of "active" mode, to give new mode
1158 * a fair chance to prove itself without too many challenges.
1159 *
1160 * This gets called when transitioning to more aggressive modulation
1161 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1162 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1163 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1164 * bit rate will typically need to increase, but not if performance was bad.
1165 */
1166 static s32 rs_get_best_rate(struct iwl_priv *priv,
1167 struct iwl_lq_sta *lq_sta,
1168 struct iwl_scale_tbl_info *tbl, /* "search" */
1169 u16 rate_mask, s8 index)
1170 {
1171 /* "active" values */
1172 struct iwl_scale_tbl_info *active_tbl =
1173 &(lq_sta->lq_info[lq_sta->active_tbl]);
1174 s32 active_sr = active_tbl->win[index].success_ratio;
1175 s32 active_tpt = active_tbl->expected_tpt[index];
1176
1177 /* expected "search" throughput */
1178 s32 *tpt_tbl = tbl->expected_tpt;
1179
1180 s32 new_rate, high, low, start_hi;
1181 u16 high_low;
1182 s8 rate = index;
1183
1184 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1185
1186 for (; ;) {
1187 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1188 tbl->lq_type);
1189
1190 low = high_low & 0xff;
1191 high = (high_low >> 8) & 0xff;
1192
1193 /*
1194 * Lower the "search" bit rate, to give new "search" mode
1195 * approximately the same throughput as "active" if:
1196 *
1197 * 1) "Active" mode has been working modestly well (but not
1198 * great), and expected "search" throughput (under perfect
1199 * conditions) at candidate rate is above the actual
1200 * measured "active" throughput (but less than expected
1201 * "active" throughput under perfect conditions).
1202 * OR
1203 * 2) "Active" mode has been working perfectly or very well
1204 * and expected "search" throughput (under perfect
1205 * conditions) at candidate rate is above expected
1206 * "active" throughput (under perfect conditions).
1207 */
1208 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1209 ((active_sr > IWL_RATE_DECREASE_TH) &&
1210 (active_sr <= IWL_RATE_HIGH_TH) &&
1211 (tpt_tbl[rate] <= active_tpt))) ||
1212 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1213 (tpt_tbl[rate] > active_tpt))) {
1214
1215 /* (2nd or later pass)
1216 * If we've already tried to raise the rate, and are
1217 * now trying to lower it, use the higher rate. */
1218 if (start_hi != IWL_RATE_INVALID) {
1219 new_rate = start_hi;
1220 break;
1221 }
1222
1223 new_rate = rate;
1224
1225 /* Loop again with lower rate */
1226 if (low != IWL_RATE_INVALID)
1227 rate = low;
1228
1229 /* Lower rate not available, use the original */
1230 else
1231 break;
1232
1233 /* Else try to raise the "search" rate to match "active" */
1234 } else {
1235 /* (2nd or later pass)
1236 * If we've already tried to lower the rate, and are
1237 * now trying to raise it, use the lower rate. */
1238 if (new_rate != IWL_RATE_INVALID)
1239 break;
1240
1241 /* Loop again with higher rate */
1242 else if (high != IWL_RATE_INVALID) {
1243 start_hi = high;
1244 rate = high;
1245
1246 /* Higher rate not available, use the original */
1247 } else {
1248 new_rate = rate;
1249 break;
1250 }
1251 }
1252 }
1253
1254 return new_rate;
1255 }
1256
1257 /*
1258 * Set up search table for MIMO2
1259 */
1260 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1261 struct iwl_lq_sta *lq_sta,
1262 struct ieee80211_conf *conf,
1263 struct ieee80211_sta *sta,
1264 struct iwl_scale_tbl_info *tbl, int index)
1265 {
1266 u16 rate_mask;
1267 s32 rate;
1268 s8 is_green = lq_sta->is_green;
1269 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1270 struct iwl_rxon_context *ctx = sta_priv->ctx;
1271
1272 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1273 return -1;
1274
1275 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
1276 return -1;
1277
1278 /* Need both Tx chains/antennas to support MIMO */
1279 if (priv->hw_params.tx_chains_num < 2)
1280 return -1;
1281
1282 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1283
1284 tbl->lq_type = LQ_MIMO2;
1285 tbl->is_dup = lq_sta->is_dup;
1286 tbl->action = 0;
1287 tbl->max_search = IWL_MAX_SEARCH;
1288 rate_mask = lq_sta->active_mimo2_rate;
1289
1290 if (iwl_is_ht40_tx_allowed(priv, ctx, sta))
1291 tbl->is_ht40 = 1;
1292 else
1293 tbl->is_ht40 = 0;
1294
1295 rs_set_expected_tpt_table(lq_sta, tbl);
1296
1297 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1298
1299 IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1300 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1301 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1302 rate, rate_mask);
1303 return -1;
1304 }
1305 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1306
1307 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1308 tbl->current_rate, is_green);
1309 return 0;
1310 }
1311
1312 /*
1313 * Set up search table for MIMO3
1314 */
1315 static int rs_switch_to_mimo3(struct iwl_priv *priv,
1316 struct iwl_lq_sta *lq_sta,
1317 struct ieee80211_conf *conf,
1318 struct ieee80211_sta *sta,
1319 struct iwl_scale_tbl_info *tbl, int index)
1320 {
1321 u16 rate_mask;
1322 s32 rate;
1323 s8 is_green = lq_sta->is_green;
1324 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1325 struct iwl_rxon_context *ctx = sta_priv->ctx;
1326
1327 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1328 return -1;
1329
1330 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
1331 return -1;
1332
1333 /* Need both Tx chains/antennas to support MIMO */
1334 if (priv->hw_params.tx_chains_num < 3)
1335 return -1;
1336
1337 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1338
1339 tbl->lq_type = LQ_MIMO3;
1340 tbl->is_dup = lq_sta->is_dup;
1341 tbl->action = 0;
1342 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1343 rate_mask = lq_sta->active_mimo3_rate;
1344
1345 if (iwl_is_ht40_tx_allowed(priv, ctx, sta))
1346 tbl->is_ht40 = 1;
1347 else
1348 tbl->is_ht40 = 0;
1349
1350 rs_set_expected_tpt_table(lq_sta, tbl);
1351
1352 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1353
1354 IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1355 rate, rate_mask);
1356 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1357 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1358 rate, rate_mask);
1359 return -1;
1360 }
1361 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1362
1363 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1364 tbl->current_rate, is_green);
1365 return 0;
1366 }
1367
1368 /*
1369 * Set up search table for SISO
1370 */
1371 static int rs_switch_to_siso(struct iwl_priv *priv,
1372 struct iwl_lq_sta *lq_sta,
1373 struct ieee80211_conf *conf,
1374 struct ieee80211_sta *sta,
1375 struct iwl_scale_tbl_info *tbl, int index)
1376 {
1377 u16 rate_mask;
1378 u8 is_green = lq_sta->is_green;
1379 s32 rate;
1380 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1381 struct iwl_rxon_context *ctx = sta_priv->ctx;
1382
1383 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1384 return -1;
1385
1386 IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1387
1388 tbl->is_dup = lq_sta->is_dup;
1389 tbl->lq_type = LQ_SISO;
1390 tbl->action = 0;
1391 tbl->max_search = IWL_MAX_SEARCH;
1392 rate_mask = lq_sta->active_siso_rate;
1393
1394 if (iwl_is_ht40_tx_allowed(priv, ctx, sta))
1395 tbl->is_ht40 = 1;
1396 else
1397 tbl->is_ht40 = 0;
1398
1399 if (is_green)
1400 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1401
1402 rs_set_expected_tpt_table(lq_sta, tbl);
1403 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1404
1405 IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1406 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1407 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1408 rate, rate_mask);
1409 return -1;
1410 }
1411 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1412 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1413 tbl->current_rate, is_green);
1414 return 0;
1415 }
1416
1417 /*
1418 * Try to switch to new modulation mode from legacy
1419 */
1420 static int rs_move_legacy_other(struct iwl_priv *priv,
1421 struct iwl_lq_sta *lq_sta,
1422 struct ieee80211_conf *conf,
1423 struct ieee80211_sta *sta,
1424 int index)
1425 {
1426 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1427 struct iwl_scale_tbl_info *search_tbl =
1428 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1429 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1430 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1431 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1432 u8 start_action;
1433 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1434 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1435 int ret = 0;
1436 u8 update_search_tbl_counter = 0;
1437
1438 switch (priv->bt_traffic_load) {
1439 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1440 /* nothing */
1441 break;
1442 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1443 /* avoid antenna B unless MIMO */
1444 if (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2)
1445 tbl->action = IWL_LEGACY_SWITCH_SISO;
1446 break;
1447 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1448 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1449 /* avoid antenna B and MIMO */
1450 valid_tx_ant =
1451 first_antenna(priv->nvm_data->valid_tx_ant);
1452 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2 &&
1453 tbl->action != IWL_LEGACY_SWITCH_SISO)
1454 tbl->action = IWL_LEGACY_SWITCH_SISO;
1455 break;
1456 default:
1457 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1458 break;
1459 }
1460
1461 if (!iwl_ht_enabled(priv))
1462 /* stay in Legacy */
1463 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1464 else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1465 tbl->action > IWL_LEGACY_SWITCH_SISO)
1466 tbl->action = IWL_LEGACY_SWITCH_SISO;
1467
1468 /* configure as 1x1 if bt full concurrency */
1469 if (priv->bt_full_concurrent) {
1470 if (!iwl_ht_enabled(priv))
1471 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1472 else if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1473 tbl->action = IWL_LEGACY_SWITCH_SISO;
1474 valid_tx_ant =
1475 first_antenna(priv->nvm_data->valid_tx_ant);
1476 }
1477
1478 start_action = tbl->action;
1479 for (; ;) {
1480 lq_sta->action_counter++;
1481 switch (tbl->action) {
1482 case IWL_LEGACY_SWITCH_ANTENNA1:
1483 case IWL_LEGACY_SWITCH_ANTENNA2:
1484 IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1485
1486 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1487 tx_chains_num <= 1) ||
1488 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1489 tx_chains_num <= 2))
1490 break;
1491
1492 /* Don't change antenna if success has been great */
1493 if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1494 !priv->bt_full_concurrent &&
1495 priv->bt_traffic_load ==
1496 IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1497 break;
1498
1499 /* Set up search table to try other antenna */
1500 memcpy(search_tbl, tbl, sz);
1501
1502 if (rs_toggle_antenna(valid_tx_ant,
1503 &search_tbl->current_rate, search_tbl)) {
1504 update_search_tbl_counter = 1;
1505 rs_set_expected_tpt_table(lq_sta, search_tbl);
1506 goto out;
1507 }
1508 break;
1509 case IWL_LEGACY_SWITCH_SISO:
1510 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1511
1512 /* Set up search table to try SISO */
1513 memcpy(search_tbl, tbl, sz);
1514 search_tbl->is_SGI = 0;
1515 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1516 search_tbl, index);
1517 if (!ret) {
1518 lq_sta->action_counter = 0;
1519 goto out;
1520 }
1521
1522 break;
1523 case IWL_LEGACY_SWITCH_MIMO2_AB:
1524 case IWL_LEGACY_SWITCH_MIMO2_AC:
1525 case IWL_LEGACY_SWITCH_MIMO2_BC:
1526 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1527
1528 /* Set up search table to try MIMO */
1529 memcpy(search_tbl, tbl, sz);
1530 search_tbl->is_SGI = 0;
1531
1532 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1533 search_tbl->ant_type = ANT_AB;
1534 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1535 search_tbl->ant_type = ANT_AC;
1536 else
1537 search_tbl->ant_type = ANT_BC;
1538
1539 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1540 break;
1541
1542 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1543 search_tbl, index);
1544 if (!ret) {
1545 lq_sta->action_counter = 0;
1546 goto out;
1547 }
1548 break;
1549
1550 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1551 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1552
1553 /* Set up search table to try MIMO3 */
1554 memcpy(search_tbl, tbl, sz);
1555 search_tbl->is_SGI = 0;
1556
1557 search_tbl->ant_type = ANT_ABC;
1558
1559 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1560 break;
1561
1562 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1563 search_tbl, index);
1564 if (!ret) {
1565 lq_sta->action_counter = 0;
1566 goto out;
1567 }
1568 break;
1569 }
1570 tbl->action++;
1571 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1572 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1573
1574 if (tbl->action == start_action)
1575 break;
1576
1577 }
1578 search_tbl->lq_type = LQ_NONE;
1579 return 0;
1580
1581 out:
1582 lq_sta->search_better_tbl = 1;
1583 tbl->action++;
1584 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1585 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1586 if (update_search_tbl_counter)
1587 search_tbl->action = tbl->action;
1588 return 0;
1589
1590 }
1591
1592 /*
1593 * Try to switch to new modulation mode from SISO
1594 */
1595 static int rs_move_siso_to_other(struct iwl_priv *priv,
1596 struct iwl_lq_sta *lq_sta,
1597 struct ieee80211_conf *conf,
1598 struct ieee80211_sta *sta, int index)
1599 {
1600 u8 is_green = lq_sta->is_green;
1601 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1602 struct iwl_scale_tbl_info *search_tbl =
1603 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1604 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1605 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1606 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1607 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1608 u8 start_action;
1609 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1610 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1611 u8 update_search_tbl_counter = 0;
1612 int ret;
1613
1614 switch (priv->bt_traffic_load) {
1615 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1616 /* nothing */
1617 break;
1618 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1619 /* avoid antenna B unless MIMO */
1620 if (tbl->action == IWL_SISO_SWITCH_ANTENNA2)
1621 tbl->action = IWL_SISO_SWITCH_MIMO2_AB;
1622 break;
1623 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1624 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1625 /* avoid antenna B and MIMO */
1626 valid_tx_ant =
1627 first_antenna(priv->nvm_data->valid_tx_ant);
1628 if (tbl->action != IWL_SISO_SWITCH_ANTENNA1)
1629 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1630 break;
1631 default:
1632 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1633 break;
1634 }
1635
1636 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1637 tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1638 /* stay in SISO */
1639 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1640 }
1641
1642 /* configure as 1x1 if bt full concurrency */
1643 if (priv->bt_full_concurrent) {
1644 valid_tx_ant =
1645 first_antenna(priv->nvm_data->valid_tx_ant);
1646 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1647 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1648 }
1649
1650 start_action = tbl->action;
1651 for (;;) {
1652 lq_sta->action_counter++;
1653 switch (tbl->action) {
1654 case IWL_SISO_SWITCH_ANTENNA1:
1655 case IWL_SISO_SWITCH_ANTENNA2:
1656 IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1657 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1658 tx_chains_num <= 1) ||
1659 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1660 tx_chains_num <= 2))
1661 break;
1662
1663 if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1664 !priv->bt_full_concurrent &&
1665 priv->bt_traffic_load ==
1666 IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1667 break;
1668
1669 memcpy(search_tbl, tbl, sz);
1670 if (rs_toggle_antenna(valid_tx_ant,
1671 &search_tbl->current_rate, search_tbl)) {
1672 update_search_tbl_counter = 1;
1673 goto out;
1674 }
1675 break;
1676 case IWL_SISO_SWITCH_MIMO2_AB:
1677 case IWL_SISO_SWITCH_MIMO2_AC:
1678 case IWL_SISO_SWITCH_MIMO2_BC:
1679 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1680 memcpy(search_tbl, tbl, sz);
1681 search_tbl->is_SGI = 0;
1682
1683 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1684 search_tbl->ant_type = ANT_AB;
1685 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1686 search_tbl->ant_type = ANT_AC;
1687 else
1688 search_tbl->ant_type = ANT_BC;
1689
1690 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1691 break;
1692
1693 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1694 search_tbl, index);
1695 if (!ret)
1696 goto out;
1697 break;
1698 case IWL_SISO_SWITCH_GI:
1699 if (!tbl->is_ht40 && !(ht_cap->cap &
1700 IEEE80211_HT_CAP_SGI_20))
1701 break;
1702 if (tbl->is_ht40 && !(ht_cap->cap &
1703 IEEE80211_HT_CAP_SGI_40))
1704 break;
1705
1706 IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1707
1708 memcpy(search_tbl, tbl, sz);
1709 if (is_green) {
1710 if (!tbl->is_SGI)
1711 break;
1712 else
1713 IWL_ERR(priv,
1714 "SGI was set in GF+SISO\n");
1715 }
1716 search_tbl->is_SGI = !tbl->is_SGI;
1717 rs_set_expected_tpt_table(lq_sta, search_tbl);
1718 if (tbl->is_SGI) {
1719 s32 tpt = lq_sta->last_tpt / 100;
1720 if (tpt >= search_tbl->expected_tpt[index])
1721 break;
1722 }
1723 search_tbl->current_rate =
1724 rate_n_flags_from_tbl(priv, search_tbl,
1725 index, is_green);
1726 update_search_tbl_counter = 1;
1727 goto out;
1728 case IWL_SISO_SWITCH_MIMO3_ABC:
1729 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1730 memcpy(search_tbl, tbl, sz);
1731 search_tbl->is_SGI = 0;
1732 search_tbl->ant_type = ANT_ABC;
1733
1734 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1735 break;
1736
1737 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1738 search_tbl, index);
1739 if (!ret)
1740 goto out;
1741 break;
1742 }
1743 tbl->action++;
1744 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1745 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1746
1747 if (tbl->action == start_action)
1748 break;
1749 }
1750 search_tbl->lq_type = LQ_NONE;
1751 return 0;
1752
1753 out:
1754 lq_sta->search_better_tbl = 1;
1755 tbl->action++;
1756 if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1757 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1758 if (update_search_tbl_counter)
1759 search_tbl->action = tbl->action;
1760
1761 return 0;
1762 }
1763
1764 /*
1765 * Try to switch to new modulation mode from MIMO2
1766 */
1767 static int rs_move_mimo2_to_other(struct iwl_priv *priv,
1768 struct iwl_lq_sta *lq_sta,
1769 struct ieee80211_conf *conf,
1770 struct ieee80211_sta *sta, int index)
1771 {
1772 s8 is_green = lq_sta->is_green;
1773 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1774 struct iwl_scale_tbl_info *search_tbl =
1775 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1776 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1777 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1778 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1779 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1780 u8 start_action;
1781 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1782 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1783 u8 update_search_tbl_counter = 0;
1784 int ret;
1785
1786 switch (priv->bt_traffic_load) {
1787 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1788 /* nothing */
1789 break;
1790 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1791 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1792 /* avoid antenna B and MIMO */
1793 if (tbl->action != IWL_MIMO2_SWITCH_SISO_A)
1794 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1795 break;
1796 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1797 /* avoid antenna B unless MIMO */
1798 if (tbl->action == IWL_MIMO2_SWITCH_SISO_B ||
1799 tbl->action == IWL_MIMO2_SWITCH_SISO_C)
1800 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1801 break;
1802 default:
1803 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1804 break;
1805 }
1806
1807 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1808 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1809 tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1810 /* switch in SISO */
1811 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1812 }
1813
1814 /* configure as 1x1 if bt full concurrency */
1815 if (priv->bt_full_concurrent &&
1816 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1817 tbl->action > IWL_MIMO2_SWITCH_SISO_C))
1818 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1819
1820 start_action = tbl->action;
1821 for (;;) {
1822 lq_sta->action_counter++;
1823 switch (tbl->action) {
1824 case IWL_MIMO2_SWITCH_ANTENNA1:
1825 case IWL_MIMO2_SWITCH_ANTENNA2:
1826 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1827
1828 if (tx_chains_num <= 2)
1829 break;
1830
1831 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1832 break;
1833
1834 memcpy(search_tbl, tbl, sz);
1835 if (rs_toggle_antenna(valid_tx_ant,
1836 &search_tbl->current_rate, search_tbl)) {
1837 update_search_tbl_counter = 1;
1838 goto out;
1839 }
1840 break;
1841 case IWL_MIMO2_SWITCH_SISO_A:
1842 case IWL_MIMO2_SWITCH_SISO_B:
1843 case IWL_MIMO2_SWITCH_SISO_C:
1844 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1845
1846 /* Set up new search table for SISO */
1847 memcpy(search_tbl, tbl, sz);
1848
1849 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1850 search_tbl->ant_type = ANT_A;
1851 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1852 search_tbl->ant_type = ANT_B;
1853 else
1854 search_tbl->ant_type = ANT_C;
1855
1856 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1857 break;
1858
1859 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1860 search_tbl, index);
1861 if (!ret)
1862 goto out;
1863
1864 break;
1865
1866 case IWL_MIMO2_SWITCH_GI:
1867 if (!tbl->is_ht40 && !(ht_cap->cap &
1868 IEEE80211_HT_CAP_SGI_20))
1869 break;
1870 if (tbl->is_ht40 && !(ht_cap->cap &
1871 IEEE80211_HT_CAP_SGI_40))
1872 break;
1873
1874 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1875
1876 /* Set up new search table for MIMO2 */
1877 memcpy(search_tbl, tbl, sz);
1878 search_tbl->is_SGI = !tbl->is_SGI;
1879 rs_set_expected_tpt_table(lq_sta, search_tbl);
1880 /*
1881 * If active table already uses the fastest possible
1882 * modulation (dual stream with short guard interval),
1883 * and it's working well, there's no need to look
1884 * for a better type of modulation!
1885 */
1886 if (tbl->is_SGI) {
1887 s32 tpt = lq_sta->last_tpt / 100;
1888 if (tpt >= search_tbl->expected_tpt[index])
1889 break;
1890 }
1891 search_tbl->current_rate =
1892 rate_n_flags_from_tbl(priv, search_tbl,
1893 index, is_green);
1894 update_search_tbl_counter = 1;
1895 goto out;
1896
1897 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1898 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1899 memcpy(search_tbl, tbl, sz);
1900 search_tbl->is_SGI = 0;
1901 search_tbl->ant_type = ANT_ABC;
1902
1903 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1904 break;
1905
1906 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1907 search_tbl, index);
1908 if (!ret)
1909 goto out;
1910
1911 break;
1912 }
1913 tbl->action++;
1914 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1915 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1916
1917 if (tbl->action == start_action)
1918 break;
1919 }
1920 search_tbl->lq_type = LQ_NONE;
1921 return 0;
1922 out:
1923 lq_sta->search_better_tbl = 1;
1924 tbl->action++;
1925 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1926 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1927 if (update_search_tbl_counter)
1928 search_tbl->action = tbl->action;
1929
1930 return 0;
1931
1932 }
1933
1934 /*
1935 * Try to switch to new modulation mode from MIMO3
1936 */
1937 static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1938 struct iwl_lq_sta *lq_sta,
1939 struct ieee80211_conf *conf,
1940 struct ieee80211_sta *sta, int index)
1941 {
1942 s8 is_green = lq_sta->is_green;
1943 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1944 struct iwl_scale_tbl_info *search_tbl =
1945 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1946 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1947 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1948 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1949 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1950 u8 start_action;
1951 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1952 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1953 int ret;
1954 u8 update_search_tbl_counter = 0;
1955
1956 switch (priv->bt_traffic_load) {
1957 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1958 /* nothing */
1959 break;
1960 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1961 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1962 /* avoid antenna B and MIMO */
1963 if (tbl->action != IWL_MIMO3_SWITCH_SISO_A)
1964 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1965 break;
1966 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1967 /* avoid antenna B unless MIMO */
1968 if (tbl->action == IWL_MIMO3_SWITCH_SISO_B ||
1969 tbl->action == IWL_MIMO3_SWITCH_SISO_C)
1970 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1971 break;
1972 default:
1973 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1974 break;
1975 }
1976
1977 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1978 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1979 tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1980 /* switch in SISO */
1981 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1982 }
1983
1984 /* configure as 1x1 if bt full concurrency */
1985 if (priv->bt_full_concurrent &&
1986 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1987 tbl->action > IWL_MIMO3_SWITCH_SISO_C))
1988 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1989
1990 start_action = tbl->action;
1991 for (;;) {
1992 lq_sta->action_counter++;
1993 switch (tbl->action) {
1994 case IWL_MIMO3_SWITCH_ANTENNA1:
1995 case IWL_MIMO3_SWITCH_ANTENNA2:
1996 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
1997
1998 if (tx_chains_num <= 3)
1999 break;
2000
2001 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
2002 break;
2003
2004 memcpy(search_tbl, tbl, sz);
2005 if (rs_toggle_antenna(valid_tx_ant,
2006 &search_tbl->current_rate, search_tbl))
2007 goto out;
2008 break;
2009 case IWL_MIMO3_SWITCH_SISO_A:
2010 case IWL_MIMO3_SWITCH_SISO_B:
2011 case IWL_MIMO3_SWITCH_SISO_C:
2012 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
2013
2014 /* Set up new search table for SISO */
2015 memcpy(search_tbl, tbl, sz);
2016
2017 if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
2018 search_tbl->ant_type = ANT_A;
2019 else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
2020 search_tbl->ant_type = ANT_B;
2021 else
2022 search_tbl->ant_type = ANT_C;
2023
2024 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2025 break;
2026
2027 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
2028 search_tbl, index);
2029 if (!ret)
2030 goto out;
2031
2032 break;
2033
2034 case IWL_MIMO3_SWITCH_MIMO2_AB:
2035 case IWL_MIMO3_SWITCH_MIMO2_AC:
2036 case IWL_MIMO3_SWITCH_MIMO2_BC:
2037 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
2038
2039 memcpy(search_tbl, tbl, sz);
2040 search_tbl->is_SGI = 0;
2041 if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
2042 search_tbl->ant_type = ANT_AB;
2043 else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
2044 search_tbl->ant_type = ANT_AC;
2045 else
2046 search_tbl->ant_type = ANT_BC;
2047
2048 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2049 break;
2050
2051 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
2052 search_tbl, index);
2053 if (!ret)
2054 goto out;
2055
2056 break;
2057
2058 case IWL_MIMO3_SWITCH_GI:
2059 if (!tbl->is_ht40 && !(ht_cap->cap &
2060 IEEE80211_HT_CAP_SGI_20))
2061 break;
2062 if (tbl->is_ht40 && !(ht_cap->cap &
2063 IEEE80211_HT_CAP_SGI_40))
2064 break;
2065
2066 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
2067
2068 /* Set up new search table for MIMO */
2069 memcpy(search_tbl, tbl, sz);
2070 search_tbl->is_SGI = !tbl->is_SGI;
2071 rs_set_expected_tpt_table(lq_sta, search_tbl);
2072 /*
2073 * If active table already uses the fastest possible
2074 * modulation (dual stream with short guard interval),
2075 * and it's working well, there's no need to look
2076 * for a better type of modulation!
2077 */
2078 if (tbl->is_SGI) {
2079 s32 tpt = lq_sta->last_tpt / 100;
2080 if (tpt >= search_tbl->expected_tpt[index])
2081 break;
2082 }
2083 search_tbl->current_rate =
2084 rate_n_flags_from_tbl(priv, search_tbl,
2085 index, is_green);
2086 update_search_tbl_counter = 1;
2087 goto out;
2088 }
2089 tbl->action++;
2090 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2091 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2092
2093 if (tbl->action == start_action)
2094 break;
2095 }
2096 search_tbl->lq_type = LQ_NONE;
2097 return 0;
2098 out:
2099 lq_sta->search_better_tbl = 1;
2100 tbl->action++;
2101 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2102 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2103 if (update_search_tbl_counter)
2104 search_tbl->action = tbl->action;
2105
2106 return 0;
2107
2108 }
2109
2110 /*
2111 * Check whether we should continue using same modulation mode, or
2112 * begin search for a new mode, based on:
2113 * 1) # tx successes or failures while using this mode
2114 * 2) # times calling this function
2115 * 3) elapsed time in this mode (not used, for now)
2116 */
2117 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
2118 {
2119 struct iwl_scale_tbl_info *tbl;
2120 int i;
2121 int active_tbl;
2122 int flush_interval_passed = 0;
2123 struct iwl_priv *priv;
2124
2125 priv = lq_sta->drv;
2126 active_tbl = lq_sta->active_tbl;
2127
2128 tbl = &(lq_sta->lq_info[active_tbl]);
2129
2130 /* If we've been disallowing search, see if we should now allow it */
2131 if (lq_sta->stay_in_tbl) {
2132
2133 /* Elapsed time using current modulation mode */
2134 if (lq_sta->flush_timer)
2135 flush_interval_passed =
2136 time_after(jiffies,
2137 (unsigned long)(lq_sta->flush_timer +
2138 IWL_RATE_SCALE_FLUSH_INTVL));
2139
2140 /*
2141 * Check if we should allow search for new modulation mode.
2142 * If many frames have failed or succeeded, or we've used
2143 * this same modulation for a long time, allow search, and
2144 * reset history stats that keep track of whether we should
2145 * allow a new search. Also (below) reset all bitmaps and
2146 * stats in active history.
2147 */
2148 if (force_search ||
2149 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
2150 (lq_sta->total_success > lq_sta->max_success_limit) ||
2151 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
2152 && (flush_interval_passed))) {
2153 IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n",
2154 lq_sta->total_failed,
2155 lq_sta->total_success,
2156 flush_interval_passed);
2157
2158 /* Allow search for new mode */
2159 lq_sta->stay_in_tbl = 0; /* only place reset */
2160 lq_sta->total_failed = 0;
2161 lq_sta->total_success = 0;
2162 lq_sta->flush_timer = 0;
2163
2164 /*
2165 * Else if we've used this modulation mode enough repetitions
2166 * (regardless of elapsed time or success/failure), reset
2167 * history bitmaps and rate-specific stats for all rates in
2168 * active table.
2169 */
2170 } else {
2171 lq_sta->table_count++;
2172 if (lq_sta->table_count >=
2173 lq_sta->table_count_limit) {
2174 lq_sta->table_count = 0;
2175
2176 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
2177 for (i = 0; i < IWL_RATE_COUNT; i++)
2178 rs_rate_scale_clear_window(
2179 &(tbl->win[i]));
2180 }
2181 }
2182
2183 /* If transitioning to allow "search", reset all history
2184 * bitmaps and stats in active table (this will become the new
2185 * "search" table). */
2186 if (!lq_sta->stay_in_tbl) {
2187 for (i = 0; i < IWL_RATE_COUNT; i++)
2188 rs_rate_scale_clear_window(&(tbl->win[i]));
2189 }
2190 }
2191 }
2192
2193 /*
2194 * setup rate table in uCode
2195 */
2196 static void rs_update_rate_tbl(struct iwl_priv *priv,
2197 struct iwl_rxon_context *ctx,
2198 struct iwl_lq_sta *lq_sta,
2199 struct iwl_scale_tbl_info *tbl,
2200 int index, u8 is_green)
2201 {
2202 u32 rate;
2203
2204 /* Update uCode's rate table. */
2205 rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2206 rs_fill_link_cmd(priv, lq_sta, rate);
2207 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2208 }
2209
2210 /*
2211 * Do rate scaling and search for new modulation mode.
2212 */
2213 static void rs_rate_scale_perform(struct iwl_priv *priv,
2214 struct sk_buff *skb,
2215 struct ieee80211_sta *sta,
2216 struct iwl_lq_sta *lq_sta)
2217 {
2218 struct ieee80211_hw *hw = priv->hw;
2219 struct ieee80211_conf *conf = &hw->conf;
2220 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2221 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2222 int low = IWL_RATE_INVALID;
2223 int high = IWL_RATE_INVALID;
2224 int index;
2225 int i;
2226 struct iwl_rate_scale_data *window = NULL;
2227 int current_tpt = IWL_INVALID_VALUE;
2228 int low_tpt = IWL_INVALID_VALUE;
2229 int high_tpt = IWL_INVALID_VALUE;
2230 u32 fail_count;
2231 s8 scale_action = 0;
2232 u16 rate_mask;
2233 u8 update_lq = 0;
2234 struct iwl_scale_tbl_info *tbl, *tbl1;
2235 u16 rate_scale_index_msk = 0;
2236 u8 is_green = 0;
2237 u8 active_tbl = 0;
2238 u8 done_search = 0;
2239 u16 high_low;
2240 s32 sr;
2241 u8 tid = IWL_MAX_TID_COUNT;
2242 struct iwl_tid_data *tid_data;
2243 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
2244 struct iwl_rxon_context *ctx = sta_priv->ctx;
2245
2246 IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
2247
2248 /* Send management frames and NO_ACK data using lowest rate. */
2249 /* TODO: this could probably be improved.. */
2250 if (!ieee80211_is_data(hdr->frame_control) ||
2251 info->flags & IEEE80211_TX_CTL_NO_ACK)
2252 return;
2253
2254 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
2255
2256 tid = rs_tl_add_packet(lq_sta, hdr);
2257 if ((tid != IWL_MAX_TID_COUNT) &&
2258 (lq_sta->tx_agg_tid_en & (1 << tid))) {
2259 tid_data = &priv->tid_data[lq_sta->lq.sta_id][tid];
2260 if (tid_data->agg.state == IWL_AGG_OFF)
2261 lq_sta->is_agg = 0;
2262 else
2263 lq_sta->is_agg = 1;
2264 } else
2265 lq_sta->is_agg = 0;
2266
2267 /*
2268 * Select rate-scale / modulation-mode table to work with in
2269 * the rest of this function: "search" if searching for better
2270 * modulation mode, or "active" if doing rate scaling within a mode.
2271 */
2272 if (!lq_sta->search_better_tbl)
2273 active_tbl = lq_sta->active_tbl;
2274 else
2275 active_tbl = 1 - lq_sta->active_tbl;
2276
2277 tbl = &(lq_sta->lq_info[active_tbl]);
2278 if (is_legacy(tbl->lq_type))
2279 lq_sta->is_green = 0;
2280 else
2281 lq_sta->is_green = rs_use_green(sta);
2282 is_green = lq_sta->is_green;
2283
2284 /* current tx rate */
2285 index = lq_sta->last_txrate_idx;
2286
2287 IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2288 tbl->lq_type);
2289
2290 /* rates available for this association, and for modulation mode */
2291 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2292
2293 IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
2294
2295 /* mask with station rate restriction */
2296 if (is_legacy(tbl->lq_type)) {
2297 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2298 /* supp_rates has no CCK bits in A mode */
2299 rate_scale_index_msk = (u16) (rate_mask &
2300 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2301 else
2302 rate_scale_index_msk = (u16) (rate_mask &
2303 lq_sta->supp_rates);
2304
2305 } else
2306 rate_scale_index_msk = rate_mask;
2307
2308 if (!rate_scale_index_msk)
2309 rate_scale_index_msk = rate_mask;
2310
2311 if (!((1 << index) & rate_scale_index_msk)) {
2312 IWL_ERR(priv, "Current Rate is not valid\n");
2313 if (lq_sta->search_better_tbl) {
2314 /* revert to active table if search table is not valid*/
2315 tbl->lq_type = LQ_NONE;
2316 lq_sta->search_better_tbl = 0;
2317 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2318 /* get "active" rate info */
2319 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2320 rs_update_rate_tbl(priv, ctx, lq_sta, tbl,
2321 index, is_green);
2322 }
2323 return;
2324 }
2325
2326 /* Get expected throughput table and history window for current rate */
2327 if (!tbl->expected_tpt) {
2328 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2329 return;
2330 }
2331
2332 /* force user max rate if set by user */
2333 if ((lq_sta->max_rate_idx != -1) &&
2334 (lq_sta->max_rate_idx < index)) {
2335 index = lq_sta->max_rate_idx;
2336 update_lq = 1;
2337 window = &(tbl->win[index]);
2338 goto lq_update;
2339 }
2340
2341 window = &(tbl->win[index]);
2342
2343 /*
2344 * If there is not enough history to calculate actual average
2345 * throughput, keep analyzing results of more tx frames, without
2346 * changing rate or mode (bypass most of the rest of this function).
2347 * Set up new rate table in uCode only if old rate is not supported
2348 * in current association (use new rate found above).
2349 */
2350 fail_count = window->counter - window->success_counter;
2351 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2352 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2353 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2354 "for index %d\n",
2355 window->success_counter, window->counter, index);
2356
2357 /* Can't calculate this yet; not enough history */
2358 window->average_tpt = IWL_INVALID_VALUE;
2359
2360 /* Should we stay with this modulation mode,
2361 * or search for a new one? */
2362 rs_stay_in_table(lq_sta, false);
2363
2364 goto out;
2365 }
2366 /* Else we have enough samples; calculate estimate of
2367 * actual average throughput */
2368 if (window->average_tpt != ((window->success_ratio *
2369 tbl->expected_tpt[index] + 64) / 128)) {
2370 IWL_ERR(priv, "expected_tpt should have been calculated by now\n");
2371 window->average_tpt = ((window->success_ratio *
2372 tbl->expected_tpt[index] + 64) / 128);
2373 }
2374
2375 /* If we are searching for better modulation mode, check success. */
2376 if (lq_sta->search_better_tbl &&
2377 (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
2378 /* If good success, continue using the "search" mode;
2379 * no need to send new link quality command, since we're
2380 * continuing to use the setup that we've been trying. */
2381 if (window->average_tpt > lq_sta->last_tpt) {
2382
2383 IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2384 "suc=%d cur-tpt=%d old-tpt=%d\n",
2385 window->success_ratio,
2386 window->average_tpt,
2387 lq_sta->last_tpt);
2388
2389 if (!is_legacy(tbl->lq_type))
2390 lq_sta->enable_counter = 1;
2391
2392 /* Swap tables; "search" becomes "active" */
2393 lq_sta->active_tbl = active_tbl;
2394 current_tpt = window->average_tpt;
2395
2396 /* Else poor success; go back to mode in "active" table */
2397 } else {
2398
2399 IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2400 "suc=%d cur-tpt=%d old-tpt=%d\n",
2401 window->success_ratio,
2402 window->average_tpt,
2403 lq_sta->last_tpt);
2404
2405 /* Nullify "search" table */
2406 tbl->lq_type = LQ_NONE;
2407
2408 /* Revert to "active" table */
2409 active_tbl = lq_sta->active_tbl;
2410 tbl = &(lq_sta->lq_info[active_tbl]);
2411
2412 /* Revert to "active" rate and throughput info */
2413 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2414 current_tpt = lq_sta->last_tpt;
2415
2416 /* Need to set up a new rate table in uCode */
2417 update_lq = 1;
2418 }
2419
2420 /* Either way, we've made a decision; modulation mode
2421 * search is done, allow rate adjustment next time. */
2422 lq_sta->search_better_tbl = 0;
2423 done_search = 1; /* Don't switch modes below! */
2424 goto lq_update;
2425 }
2426
2427 /* (Else) not in search of better modulation mode, try for better
2428 * starting rate, while staying in this mode. */
2429 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2430 tbl->lq_type);
2431 low = high_low & 0xff;
2432 high = (high_low >> 8) & 0xff;
2433
2434 /* If user set max rate, dont allow higher than user constrain */
2435 if ((lq_sta->max_rate_idx != -1) &&
2436 (lq_sta->max_rate_idx < high))
2437 high = IWL_RATE_INVALID;
2438
2439 sr = window->success_ratio;
2440
2441 /* Collect measured throughputs for current and adjacent rates */
2442 current_tpt = window->average_tpt;
2443 if (low != IWL_RATE_INVALID)
2444 low_tpt = tbl->win[low].average_tpt;
2445 if (high != IWL_RATE_INVALID)
2446 high_tpt = tbl->win[high].average_tpt;
2447
2448 scale_action = 0;
2449
2450 /* Too many failures, decrease rate */
2451 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2452 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2453 scale_action = -1;
2454
2455 /* No throughput measured yet for adjacent rates; try increase. */
2456 } else if ((low_tpt == IWL_INVALID_VALUE) &&
2457 (high_tpt == IWL_INVALID_VALUE)) {
2458
2459 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2460 scale_action = 1;
2461 else if (low != IWL_RATE_INVALID)
2462 scale_action = 0;
2463 }
2464
2465 /* Both adjacent throughputs are measured, but neither one has better
2466 * throughput; we're using the best rate, don't change it! */
2467 else if ((low_tpt != IWL_INVALID_VALUE) &&
2468 (high_tpt != IWL_INVALID_VALUE) &&
2469 (low_tpt < current_tpt) &&
2470 (high_tpt < current_tpt))
2471 scale_action = 0;
2472
2473 /* At least one adjacent rate's throughput is measured,
2474 * and may have better performance. */
2475 else {
2476 /* Higher adjacent rate's throughput is measured */
2477 if (high_tpt != IWL_INVALID_VALUE) {
2478 /* Higher rate has better throughput */
2479 if (high_tpt > current_tpt &&
2480 sr >= IWL_RATE_INCREASE_TH) {
2481 scale_action = 1;
2482 } else {
2483 scale_action = 0;
2484 }
2485
2486 /* Lower adjacent rate's throughput is measured */
2487 } else if (low_tpt != IWL_INVALID_VALUE) {
2488 /* Lower rate has better throughput */
2489 if (low_tpt > current_tpt) {
2490 IWL_DEBUG_RATE(priv,
2491 "decrease rate because of low tpt\n");
2492 scale_action = -1;
2493 } else if (sr >= IWL_RATE_INCREASE_TH) {
2494 scale_action = 1;
2495 }
2496 }
2497 }
2498
2499 /* Sanity check; asked for decrease, but success rate or throughput
2500 * has been good at old rate. Don't change it. */
2501 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2502 ((sr > IWL_RATE_HIGH_TH) ||
2503 (current_tpt > (100 * tbl->expected_tpt[low]))))
2504 scale_action = 0;
2505 if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2506 scale_action = -1;
2507 if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
2508 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2509 scale_action = -1;
2510
2511 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2512 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2513 if (lq_sta->last_bt_traffic > priv->bt_traffic_load) {
2514 /*
2515 * don't set scale_action, don't want to scale up if
2516 * the rate scale doesn't otherwise think that is a
2517 * good idea.
2518 */
2519 } else if (lq_sta->last_bt_traffic <= priv->bt_traffic_load) {
2520 scale_action = -1;
2521 }
2522 }
2523 lq_sta->last_bt_traffic = priv->bt_traffic_load;
2524
2525 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2526 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2527 /* search for a new modulation */
2528 rs_stay_in_table(lq_sta, true);
2529 goto lq_update;
2530 }
2531
2532 switch (scale_action) {
2533 case -1:
2534 /* Decrease starting rate, update uCode's rate table */
2535 if (low != IWL_RATE_INVALID) {
2536 update_lq = 1;
2537 index = low;
2538 }
2539
2540 break;
2541 case 1:
2542 /* Increase starting rate, update uCode's rate table */
2543 if (high != IWL_RATE_INVALID) {
2544 update_lq = 1;
2545 index = high;
2546 }
2547
2548 break;
2549 case 0:
2550 /* No change */
2551 default:
2552 break;
2553 }
2554
2555 IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2556 "high %d type %d\n",
2557 index, scale_action, low, high, tbl->lq_type);
2558
2559 lq_update:
2560 /* Replace uCode's rate table for the destination station. */
2561 if (update_lq)
2562 rs_update_rate_tbl(priv, ctx, lq_sta, tbl, index, is_green);
2563
2564 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
2565 /* Should we stay with this modulation mode,
2566 * or search for a new one? */
2567 rs_stay_in_table(lq_sta, false);
2568 }
2569 /*
2570 * Search for new modulation mode if we're:
2571 * 1) Not changing rates right now
2572 * 2) Not just finishing up a search
2573 * 3) Allowing a new search
2574 */
2575 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2576 /* Save current throughput to compare with "search" throughput*/
2577 lq_sta->last_tpt = current_tpt;
2578
2579 /* Select a new "search" modulation mode to try.
2580 * If one is found, set up the new "search" table. */
2581 if (is_legacy(tbl->lq_type))
2582 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2583 else if (is_siso(tbl->lq_type))
2584 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2585 else if (is_mimo2(tbl->lq_type))
2586 rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2587 else
2588 rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2589
2590 /* If new "search" mode was selected, set up in uCode table */
2591 if (lq_sta->search_better_tbl) {
2592 /* Access the "search" table, clear its history. */
2593 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2594 for (i = 0; i < IWL_RATE_COUNT; i++)
2595 rs_rate_scale_clear_window(&(tbl->win[i]));
2596
2597 /* Use new "search" start rate */
2598 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2599
2600 IWL_DEBUG_RATE(priv, "Switch current mcs: %X index: %d\n",
2601 tbl->current_rate, index);
2602 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2603 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2604 } else
2605 done_search = 1;
2606 }
2607
2608 if (done_search && !lq_sta->stay_in_tbl) {
2609 /* If the "active" (non-search) mode was legacy,
2610 * and we've tried switching antennas,
2611 * but we haven't been able to try HT modes (not available),
2612 * stay with best antenna legacy modulation for a while
2613 * before next round of mode comparisons. */
2614 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2615 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2616 lq_sta->action_counter > tbl1->max_search) {
2617 IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2618 rs_set_stay_in_table(priv, 1, lq_sta);
2619 }
2620
2621 /* If we're in an HT mode, and all 3 mode switch actions
2622 * have been tried and compared, stay in this best modulation
2623 * mode for a while before next round of mode comparisons. */
2624 if (lq_sta->enable_counter &&
2625 (lq_sta->action_counter >= tbl1->max_search) &&
2626 iwl_ht_enabled(priv)) {
2627 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2628 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2629 (tid != IWL_MAX_TID_COUNT)) {
2630 u8 sta_id = lq_sta->lq.sta_id;
2631 tid_data = &priv->tid_data[sta_id][tid];
2632 if (tid_data->agg.state == IWL_AGG_OFF) {
2633 IWL_DEBUG_RATE(priv,
2634 "try to aggregate tid %d\n",
2635 tid);
2636 rs_tl_turn_on_agg(priv, tid,
2637 lq_sta, sta);
2638 }
2639 }
2640 rs_set_stay_in_table(priv, 0, lq_sta);
2641 }
2642 }
2643
2644 out:
2645 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2646 lq_sta->last_txrate_idx = index;
2647 }
2648
2649 /**
2650 * rs_initialize_lq - Initialize a station's hardware rate table
2651 *
2652 * The uCode's station table contains a table of fallback rates
2653 * for automatic fallback during transmission.
2654 *
2655 * NOTE: This sets up a default set of values. These will be replaced later
2656 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2657 * rc80211_simple.
2658 *
2659 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2660 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2661 * which requires station table entry to exist).
2662 */
2663 static void rs_initialize_lq(struct iwl_priv *priv,
2664 struct ieee80211_sta *sta,
2665 struct iwl_lq_sta *lq_sta)
2666 {
2667 struct iwl_scale_tbl_info *tbl;
2668 int rate_idx;
2669 int i;
2670 u32 rate;
2671 u8 use_green = rs_use_green(sta);
2672 u8 active_tbl = 0;
2673 u8 valid_tx_ant;
2674 struct iwl_station_priv *sta_priv;
2675 struct iwl_rxon_context *ctx;
2676
2677 if (!sta || !lq_sta)
2678 return;
2679
2680 sta_priv = (void *)sta->drv_priv;
2681 ctx = sta_priv->ctx;
2682
2683 i = lq_sta->last_txrate_idx;
2684
2685 valid_tx_ant = priv->nvm_data->valid_tx_ant;
2686
2687 if (!lq_sta->search_better_tbl)
2688 active_tbl = lq_sta->active_tbl;
2689 else
2690 active_tbl = 1 - lq_sta->active_tbl;
2691
2692 tbl = &(lq_sta->lq_info[active_tbl]);
2693
2694 if ((i < 0) || (i >= IWL_RATE_COUNT))
2695 i = 0;
2696
2697 rate = iwl_rates[i].plcp;
2698 tbl->ant_type = first_antenna(valid_tx_ant);
2699 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2700
2701 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2702 rate |= RATE_MCS_CCK_MSK;
2703
2704 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2705 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2706 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2707
2708 rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2709 tbl->current_rate = rate;
2710 rs_set_expected_tpt_table(lq_sta, tbl);
2711 rs_fill_link_cmd(NULL, lq_sta, rate);
2712 priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2713 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_SYNC, true);
2714 }
2715
2716 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2717 struct ieee80211_tx_rate_control *txrc)
2718 {
2719
2720 struct sk_buff *skb = txrc->skb;
2721 struct ieee80211_supported_band *sband = txrc->sband;
2722 struct iwl_op_mode *op_mode __maybe_unused =
2723 (struct iwl_op_mode *)priv_r;
2724 struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
2725 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2726 struct iwl_lq_sta *lq_sta = priv_sta;
2727 int rate_idx;
2728
2729 IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2730
2731 /* Get max rate if user set max rate */
2732 if (lq_sta) {
2733 lq_sta->max_rate_idx = txrc->max_rate_idx;
2734 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2735 (lq_sta->max_rate_idx != -1))
2736 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2737 if ((lq_sta->max_rate_idx < 0) ||
2738 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2739 lq_sta->max_rate_idx = -1;
2740 }
2741
2742 /* Treat uninitialized rate scaling data same as non-existing. */
2743 if (lq_sta && !lq_sta->drv) {
2744 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
2745 priv_sta = NULL;
2746 }
2747
2748 /* Send management frames and NO_ACK data using lowest rate. */
2749 if (rate_control_send_low(sta, priv_sta, txrc))
2750 return;
2751
2752 rate_idx = lq_sta->last_txrate_idx;
2753
2754 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2755 rate_idx -= IWL_FIRST_OFDM_RATE;
2756 /* 6M and 9M shared same MCS index */
2757 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2758 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2759 IWL_RATE_MIMO3_6M_PLCP)
2760 rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2761 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2762 IWL_RATE_MIMO2_6M_PLCP)
2763 rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2764 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2765 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2766 info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2767 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2768 info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
2769 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2770 info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2771 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2772 info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2773 } else {
2774 /* Check for invalid rates */
2775 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2776 ((sband->band == IEEE80211_BAND_5GHZ) &&
2777 (rate_idx < IWL_FIRST_OFDM_RATE)))
2778 rate_idx = rate_lowest_index(sband, sta);
2779 /* On valid 5 GHz rate, adjust index */
2780 else if (sband->band == IEEE80211_BAND_5GHZ)
2781 rate_idx -= IWL_FIRST_OFDM_RATE;
2782 info->control.rates[0].flags = 0;
2783 }
2784 info->control.rates[0].idx = rate_idx;
2785 info->control.rates[0].count = 1;
2786 }
2787
2788 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2789 gfp_t gfp)
2790 {
2791 struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2792 struct iwl_op_mode *op_mode __maybe_unused =
2793 (struct iwl_op_mode *)priv_rate;
2794 struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
2795
2796 IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2797
2798 return &sta_priv->lq_sta;
2799 }
2800
2801 /*
2802 * Called after adding a new station to initialize rate scaling
2803 */
2804 void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id)
2805 {
2806 int i, j;
2807 struct ieee80211_hw *hw = priv->hw;
2808 struct ieee80211_conf *conf = &priv->hw->conf;
2809 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2810 struct iwl_station_priv *sta_priv;
2811 struct iwl_lq_sta *lq_sta;
2812 struct ieee80211_supported_band *sband;
2813 unsigned long supp; /* must be unsigned long for for_each_set_bit */
2814
2815 sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2816 lq_sta = &sta_priv->lq_sta;
2817 sband = hw->wiphy->bands[conf->chandef.chan->band];
2818
2819
2820 lq_sta->lq.sta_id = sta_id;
2821
2822 for (j = 0; j < LQ_SIZE; j++)
2823 for (i = 0; i < IWL_RATE_COUNT; i++)
2824 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2825
2826 lq_sta->flush_timer = 0;
2827 lq_sta->supp_rates = sta->supp_rates[sband->band];
2828
2829 IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n",
2830 sta_id);
2831 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2832 * the lowest or the highest rate.. Could consider using RSSI from
2833 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2834 * after assoc.. */
2835
2836 lq_sta->is_dup = 0;
2837 lq_sta->max_rate_idx = -1;
2838 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2839 lq_sta->is_green = rs_use_green(sta);
2840 lq_sta->band = sband->band;
2841 /*
2842 * active legacy rates as per supported rates bitmap
2843 */
2844 supp = sta->supp_rates[sband->band];
2845 lq_sta->active_legacy_rate = 0;
2846 for_each_set_bit(i, &supp, BITS_PER_LONG)
2847 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2848
2849 /*
2850 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2851 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2852 */
2853 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2854 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2855 lq_sta->active_siso_rate &= ~((u16)0x2);
2856 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2857
2858 /* Same here */
2859 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2860 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2861 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2862 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2863
2864 lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2865 lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2866 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2867 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2868
2869 IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2870 lq_sta->active_siso_rate,
2871 lq_sta->active_mimo2_rate,
2872 lq_sta->active_mimo3_rate);
2873
2874 /* These values will be overridden later */
2875 lq_sta->lq.general_params.single_stream_ant_msk =
2876 first_antenna(priv->nvm_data->valid_tx_ant);
2877 lq_sta->lq.general_params.dual_stream_ant_msk =
2878 priv->nvm_data->valid_tx_ant &
2879 ~first_antenna(priv->nvm_data->valid_tx_ant);
2880 if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2881 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2882 } else if (num_of_ant(priv->nvm_data->valid_tx_ant) == 2) {
2883 lq_sta->lq.general_params.dual_stream_ant_msk =
2884 priv->nvm_data->valid_tx_ant;
2885 }
2886
2887 /* as default allow aggregation for all tids */
2888 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2889 lq_sta->drv = priv;
2890
2891 /* Set last_txrate_idx to lowest rate */
2892 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2893 if (sband->band == IEEE80211_BAND_5GHZ)
2894 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2895 lq_sta->is_agg = 0;
2896 #ifdef CONFIG_MAC80211_DEBUGFS
2897 lq_sta->dbg_fixed_rate = 0;
2898 #endif
2899
2900 rs_initialize_lq(priv, sta, lq_sta);
2901 }
2902
2903 static void rs_fill_link_cmd(struct iwl_priv *priv,
2904 struct iwl_lq_sta *lq_sta, u32 new_rate)
2905 {
2906 struct iwl_scale_tbl_info tbl_type;
2907 int index = 0;
2908 int rate_idx;
2909 int repeat_rate = 0;
2910 u8 ant_toggle_cnt = 0;
2911 u8 use_ht_possible = 1;
2912 u8 valid_tx_ant = 0;
2913 struct iwl_station_priv *sta_priv =
2914 container_of(lq_sta, struct iwl_station_priv, lq_sta);
2915 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2916
2917 /* Override starting rate (index 0) if needed for debug purposes */
2918 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2919
2920 /* Interpret new_rate (rate_n_flags) */
2921 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2922 &tbl_type, &rate_idx);
2923
2924 if (priv && priv->bt_full_concurrent) {
2925 /* 1x1 only */
2926 tbl_type.ant_type =
2927 first_antenna(priv->nvm_data->valid_tx_ant);
2928 }
2929
2930 /* How many times should we repeat the initial rate? */
2931 if (is_legacy(tbl_type.lq_type)) {
2932 ant_toggle_cnt = 1;
2933 repeat_rate = IWL_NUMBER_TRY;
2934 } else {
2935 repeat_rate = min(IWL_HT_NUMBER_TRY,
2936 LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2937 }
2938
2939 lq_cmd->general_params.mimo_delimiter =
2940 is_mimo(tbl_type.lq_type) ? 1 : 0;
2941
2942 /* Fill 1st table entry (index 0) */
2943 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2944
2945 if (num_of_ant(tbl_type.ant_type) == 1) {
2946 lq_cmd->general_params.single_stream_ant_msk =
2947 tbl_type.ant_type;
2948 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2949 lq_cmd->general_params.dual_stream_ant_msk =
2950 tbl_type.ant_type;
2951 } /* otherwise we don't modify the existing value */
2952
2953 index++;
2954 repeat_rate--;
2955 if (priv) {
2956 if (priv->bt_full_concurrent)
2957 valid_tx_ant = ANT_A;
2958 else
2959 valid_tx_ant = priv->nvm_data->valid_tx_ant;
2960 }
2961
2962 /* Fill rest of rate table */
2963 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2964 /* Repeat initial/next rate.
2965 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2966 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2967 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2968 if (is_legacy(tbl_type.lq_type)) {
2969 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2970 ant_toggle_cnt++;
2971 else if (priv &&
2972 rs_toggle_antenna(valid_tx_ant,
2973 &new_rate, &tbl_type))
2974 ant_toggle_cnt = 1;
2975 }
2976
2977 /* Override next rate if needed for debug purposes */
2978 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2979
2980 /* Fill next table entry */
2981 lq_cmd->rs_table[index].rate_n_flags =
2982 cpu_to_le32(new_rate);
2983 repeat_rate--;
2984 index++;
2985 }
2986
2987 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2988 &rate_idx);
2989
2990 if (priv && priv->bt_full_concurrent) {
2991 /* 1x1 only */
2992 tbl_type.ant_type =
2993 first_antenna(priv->nvm_data->valid_tx_ant);
2994 }
2995
2996 /* Indicate to uCode which entries might be MIMO.
2997 * If initial rate was MIMO, this will finally end up
2998 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2999 if (is_mimo(tbl_type.lq_type))
3000 lq_cmd->general_params.mimo_delimiter = index;
3001
3002 /* Get next rate */
3003 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
3004 use_ht_possible);
3005
3006 /* How many times should we repeat the next rate? */
3007 if (is_legacy(tbl_type.lq_type)) {
3008 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
3009 ant_toggle_cnt++;
3010 else if (priv &&
3011 rs_toggle_antenna(valid_tx_ant,
3012 &new_rate, &tbl_type))
3013 ant_toggle_cnt = 1;
3014
3015 repeat_rate = IWL_NUMBER_TRY;
3016 } else {
3017 repeat_rate = IWL_HT_NUMBER_TRY;
3018 }
3019
3020 /* Don't allow HT rates after next pass.
3021 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
3022 use_ht_possible = 0;
3023
3024 /* Override next rate if needed for debug purposes */
3025 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
3026
3027 /* Fill next table entry */
3028 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
3029
3030 index++;
3031 repeat_rate--;
3032 }
3033
3034 lq_cmd->agg_params.agg_frame_cnt_limit =
3035 sta_priv->max_agg_bufsize ?: LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3036 lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
3037
3038 lq_cmd->agg_params.agg_time_limit =
3039 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
3040 /*
3041 * overwrite if needed, pass aggregation time limit
3042 * to uCode in uSec
3043 */
3044 if (priv && priv->lib->bt_params &&
3045 priv->lib->bt_params->agg_time_limit &&
3046 priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH)
3047 lq_cmd->agg_params.agg_time_limit =
3048 cpu_to_le16(priv->lib->bt_params->agg_time_limit);
3049 }
3050
3051 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3052 {
3053 return hw->priv;
3054 }
3055 /* rate scale requires free function to be implemented */
3056 static void rs_free(void *priv_rate)
3057 {
3058 return;
3059 }
3060
3061 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
3062 void *priv_sta)
3063 {
3064 struct iwl_op_mode *op_mode __maybe_unused = priv_r;
3065 struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
3066
3067 IWL_DEBUG_RATE(priv, "enter\n");
3068 IWL_DEBUG_RATE(priv, "leave\n");
3069 }
3070
3071 #ifdef CONFIG_MAC80211_DEBUGFS
3072 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
3073 u32 *rate_n_flags, int index)
3074 {
3075 struct iwl_priv *priv;
3076 u8 valid_tx_ant;
3077 u8 ant_sel_tx;
3078
3079 priv = lq_sta->drv;
3080 valid_tx_ant = priv->nvm_data->valid_tx_ant;
3081 if (lq_sta->dbg_fixed_rate) {
3082 ant_sel_tx =
3083 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
3084 >> RATE_MCS_ANT_POS);
3085 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
3086 *rate_n_flags = lq_sta->dbg_fixed_rate;
3087 IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
3088 } else {
3089 lq_sta->dbg_fixed_rate = 0;
3090 IWL_ERR(priv,
3091 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
3092 ant_sel_tx, valid_tx_ant);
3093 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3094 }
3095 } else {
3096 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3097 }
3098 }
3099
3100 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3101 const char __user *user_buf, size_t count, loff_t *ppos)
3102 {
3103 struct iwl_lq_sta *lq_sta = file->private_data;
3104 struct iwl_priv *priv;
3105 char buf[64];
3106 size_t buf_size;
3107 u32 parsed_rate;
3108
3109
3110 priv = lq_sta->drv;
3111 memset(buf, 0, sizeof(buf));
3112 buf_size = min(count, sizeof(buf) - 1);
3113 if (copy_from_user(buf, user_buf, buf_size))
3114 return -EFAULT;
3115
3116 if (sscanf(buf, "%x", &parsed_rate) == 1)
3117 lq_sta->dbg_fixed_rate = parsed_rate;
3118 else
3119 lq_sta->dbg_fixed_rate = 0;
3120
3121 rs_program_fix_rate(priv, lq_sta);
3122
3123 return count;
3124 }
3125
3126 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3127 char __user *user_buf, size_t count, loff_t *ppos)
3128 {
3129 char *buff;
3130 int desc = 0;
3131 int i = 0;
3132 int index = 0;
3133 ssize_t ret;
3134
3135 struct iwl_lq_sta *lq_sta = file->private_data;
3136 struct iwl_priv *priv;
3137 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3138
3139 priv = lq_sta->drv;
3140 buff = kmalloc(1024, GFP_KERNEL);
3141 if (!buff)
3142 return -ENOMEM;
3143
3144 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3145 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
3146 lq_sta->total_failed, lq_sta->total_success,
3147 lq_sta->active_legacy_rate);
3148 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3149 lq_sta->dbg_fixed_rate);
3150 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3151 (priv->nvm_data->valid_tx_ant & ANT_A) ? "ANT_A," : "",
3152 (priv->nvm_data->valid_tx_ant & ANT_B) ? "ANT_B," : "",
3153 (priv->nvm_data->valid_tx_ant & ANT_C) ? "ANT_C" : "");
3154 desc += sprintf(buff+desc, "lq type %s\n",
3155 (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
3156 if (is_Ht(tbl->lq_type)) {
3157 desc += sprintf(buff+desc, " %s",
3158 (is_siso(tbl->lq_type)) ? "SISO" :
3159 ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
3160 desc += sprintf(buff+desc, " %s",
3161 (tbl->is_ht40) ? "40MHz" : "20MHz");
3162 desc += sprintf(buff+desc, " %s %s %s\n", (tbl->is_SGI) ? "SGI" : "",
3163 (lq_sta->is_green) ? "GF enabled" : "",
3164 (lq_sta->is_agg) ? "AGG on" : "");
3165 }
3166 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3167 lq_sta->last_rate_n_flags);
3168 desc += sprintf(buff+desc, "general:"
3169 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
3170 lq_sta->lq.general_params.flags,
3171 lq_sta->lq.general_params.mimo_delimiter,
3172 lq_sta->lq.general_params.single_stream_ant_msk,
3173 lq_sta->lq.general_params.dual_stream_ant_msk);
3174
3175 desc += sprintf(buff+desc, "agg:"
3176 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3177 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
3178 lq_sta->lq.agg_params.agg_dis_start_th,
3179 lq_sta->lq.agg_params.agg_frame_cnt_limit);
3180
3181 desc += sprintf(buff+desc,
3182 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3183 lq_sta->lq.general_params.start_rate_index[0],
3184 lq_sta->lq.general_params.start_rate_index[1],
3185 lq_sta->lq.general_params.start_rate_index[2],
3186 lq_sta->lq.general_params.start_rate_index[3]);
3187
3188 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3189 index = iwl_hwrate_to_plcp_idx(
3190 le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
3191 if (is_legacy(tbl->lq_type)) {
3192 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
3193 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3194 iwl_rate_mcs[index].mbps);
3195 } else {
3196 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
3197 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3198 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
3199 }
3200 }
3201
3202 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3203 kfree(buff);
3204 return ret;
3205 }
3206
3207 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3208 .write = rs_sta_dbgfs_scale_table_write,
3209 .read = rs_sta_dbgfs_scale_table_read,
3210 .open = simple_open,
3211 .llseek = default_llseek,
3212 };
3213 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3214 char __user *user_buf, size_t count, loff_t *ppos)
3215 {
3216 char *buff;
3217 int desc = 0;
3218 int i, j;
3219 ssize_t ret;
3220
3221 struct iwl_lq_sta *lq_sta = file->private_data;
3222
3223 buff = kmalloc(1024, GFP_KERNEL);
3224 if (!buff)
3225 return -ENOMEM;
3226
3227 for (i = 0; i < LQ_SIZE; i++) {
3228 desc += sprintf(buff+desc,
3229 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
3230 "rate=0x%X\n",
3231 lq_sta->active_tbl == i ? "*" : "x",
3232 lq_sta->lq_info[i].lq_type,
3233 lq_sta->lq_info[i].is_SGI,
3234 lq_sta->lq_info[i].is_ht40,
3235 lq_sta->lq_info[i].is_dup,
3236 lq_sta->is_green,
3237 lq_sta->lq_info[i].current_rate);
3238 for (j = 0; j < IWL_RATE_COUNT; j++) {
3239 desc += sprintf(buff+desc,
3240 "counter=%d success=%d %%=%d\n",
3241 lq_sta->lq_info[i].win[j].counter,
3242 lq_sta->lq_info[i].win[j].success_counter,
3243 lq_sta->lq_info[i].win[j].success_ratio);
3244 }
3245 }
3246 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3247 kfree(buff);
3248 return ret;
3249 }
3250
3251 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3252 .read = rs_sta_dbgfs_stats_table_read,
3253 .open = simple_open,
3254 .llseek = default_llseek,
3255 };
3256
3257 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3258 char __user *user_buf, size_t count, loff_t *ppos)
3259 {
3260 struct iwl_lq_sta *lq_sta = file->private_data;
3261 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3262 char buff[120];
3263 int desc = 0;
3264
3265 if (is_Ht(tbl->lq_type))
3266 desc += sprintf(buff+desc,
3267 "Bit Rate= %d Mb/s\n",
3268 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3269 else
3270 desc += sprintf(buff+desc,
3271 "Bit Rate= %d Mb/s\n",
3272 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3273
3274 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3275 }
3276
3277 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3278 .read = rs_sta_dbgfs_rate_scale_data_read,
3279 .open = simple_open,
3280 .llseek = default_llseek,
3281 };
3282
3283 static void rs_add_debugfs(void *priv, void *priv_sta,
3284 struct dentry *dir)
3285 {
3286 struct iwl_lq_sta *lq_sta = priv_sta;
3287 lq_sta->rs_sta_dbgfs_scale_table_file =
3288 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3289 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3290 lq_sta->rs_sta_dbgfs_stats_table_file =
3291 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3292 lq_sta, &rs_sta_dbgfs_stats_table_ops);
3293 lq_sta->rs_sta_dbgfs_rate_scale_data_file =
3294 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
3295 lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
3296 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
3297 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3298 &lq_sta->tx_agg_tid_en);
3299
3300 }
3301
3302 static void rs_remove_debugfs(void *priv, void *priv_sta)
3303 {
3304 struct iwl_lq_sta *lq_sta = priv_sta;
3305 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3306 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
3307 debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
3308 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
3309 }
3310 #endif
3311
3312 /*
3313 * Initialization of rate scaling information is done by driver after
3314 * the station is added. Since mac80211 calls this function before a
3315 * station is added we ignore it.
3316 */
3317 static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband,
3318 struct cfg80211_chan_def *chandef,
3319 struct ieee80211_sta *sta, void *priv_sta)
3320 {
3321 }
3322 static struct rate_control_ops rs_ops = {
3323 .module = NULL,
3324 .name = RS_NAME,
3325 .tx_status = rs_tx_status,
3326 .get_rate = rs_get_rate,
3327 .rate_init = rs_rate_init_stub,
3328 .alloc = rs_alloc,
3329 .free = rs_free,
3330 .alloc_sta = rs_alloc_sta,
3331 .free_sta = rs_free_sta,
3332 #ifdef CONFIG_MAC80211_DEBUGFS
3333 .add_sta_debugfs = rs_add_debugfs,
3334 .remove_sta_debugfs = rs_remove_debugfs,
3335 #endif
3336 };
3337
3338 int iwlagn_rate_control_register(void)
3339 {
3340 return ieee80211_rate_control_register(&rs_ops);
3341 }
3342
3343 void iwlagn_rate_control_unregister(void)
3344 {
3345 ieee80211_rate_control_unregister(&rs_ops);
3346 }
3347
Linux with added FPC-III support