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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / net / wireless / intel / iwlwifi / dvm / rs.c
blob226165db7dfd5bfc46007192512993c0864f75be
1 // SPDX-License-Identifier: GPL-2.0-only
2 /******************************************************************************
3 *
4 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
5 *
6 * Contact Information:
7 * Intel Linux Wireless <linuxwifi@intel.com>
8 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
9 *
10 *****************************************************************************/
11 #include <linux/kernel.h>
12 #include <linux/skbuff.h>
13 #include <linux/slab.h>
14 #include <net/mac80211.h>
15
16 #include <linux/netdevice.h>
17 #include <linux/etherdevice.h>
18 #include <linux/delay.h>
19
20 #include <linux/workqueue.h>
21
22 #include "dev.h"
23 #include "agn.h"
24
25 #define RS_NAME "iwl-agn-rs"
26
27 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
28 #define IWL_NUMBER_TRY 1
29 #define IWL_HT_NUMBER_TRY 3
30
31 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
32 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
33 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
34
35 /* max allowed rate miss before sync LQ cmd */
36 #define IWL_MISSED_RATE_MAX 15
37 /* max time to accum history 2 seconds */
38 #define IWL_RATE_SCALE_FLUSH_INTVL (3*HZ)
39
40 static u8 rs_ht_to_legacy[] = {
41 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
42 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
43 IWL_RATE_6M_INDEX,
44 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
45 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
46 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
47 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
48 };
49
50 static const u8 ant_toggle_lookup[] = {
51 /*ANT_NONE -> */ ANT_NONE,
52 /*ANT_A -> */ ANT_B,
53 /*ANT_B -> */ ANT_C,
54 /*ANT_AB -> */ ANT_BC,
55 /*ANT_C -> */ ANT_A,
56 /*ANT_AC -> */ ANT_AB,
57 /*ANT_BC -> */ ANT_AC,
58 /*ANT_ABC -> */ ANT_ABC,
59 };
60
61 #define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np) \
62 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
63 IWL_RATE_SISO_##s##M_PLCP, \
64 IWL_RATE_MIMO2_##s##M_PLCP,\
65 IWL_RATE_MIMO3_##s##M_PLCP,\
66 IWL_RATE_##r##M_IEEE, \
67 IWL_RATE_##ip##M_INDEX, \
68 IWL_RATE_##in##M_INDEX, \
69 IWL_RATE_##rp##M_INDEX, \
70 IWL_RATE_##rn##M_INDEX, \
71 IWL_RATE_##pp##M_INDEX, \
72 IWL_RATE_##np##M_INDEX }
73
74 /*
75 * Parameter order:
76 * rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
77 *
78 * If there isn't a valid next or previous rate then INV is used which
79 * maps to IWL_RATE_INVALID
80 *
81 */
82 const struct iwl_rate_info iwl_rates[IWL_RATE_COUNT] = {
83 IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2), /* 1mbps */
84 IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5), /* 2mbps */
85 IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11), /*5.5mbps */
86 IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18), /* 11mbps */
87 IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11), /* 6mbps */
88 IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11), /* 9mbps */
89 IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18), /* 12mbps */
90 IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24), /* 18mbps */
91 IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36), /* 24mbps */
92 IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48), /* 36mbps */
93 IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54), /* 48mbps */
94 IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
95 IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
96 /* FIXME:RS: ^^ should be INV (legacy) */
97 };
98
99 static inline u8 rs_extract_rate(u32 rate_n_flags)
100 {
101 return (u8)(rate_n_flags & RATE_MCS_RATE_MSK);
102 }
103
104 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
105 {
106 int idx = 0;
107
108 /* HT rate format */
109 if (rate_n_flags & RATE_MCS_HT_MSK) {
110 idx = rs_extract_rate(rate_n_flags);
111
112 if (idx >= IWL_RATE_MIMO3_6M_PLCP)
113 idx = idx - IWL_RATE_MIMO3_6M_PLCP;
114 else if (idx >= IWL_RATE_MIMO2_6M_PLCP)
115 idx = idx - IWL_RATE_MIMO2_6M_PLCP;
116
117 idx += IWL_FIRST_OFDM_RATE;
118 /* skip 9M not supported in ht*/
119 if (idx >= IWL_RATE_9M_INDEX)
120 idx += 1;
121 if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE))
122 return idx;
123
124 /* legacy rate format, search for match in table */
125 } else {
126 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
127 if (iwl_rates[idx].plcp ==
128 rs_extract_rate(rate_n_flags))
129 return idx;
130 }
131
132 return -1;
133 }
134
135 static void rs_rate_scale_perform(struct iwl_priv *priv,
136 struct sk_buff *skb,
137 struct ieee80211_sta *sta,
138 struct iwl_lq_sta *lq_sta);
139 static void rs_fill_link_cmd(struct iwl_priv *priv,
140 struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
141 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
142
143
144 #ifdef CONFIG_MAC80211_DEBUGFS
145 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
146 u32 *rate_n_flags, int index);
147 #else
148 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
149 u32 *rate_n_flags, int index)
150 {}
151 #endif
152
153 /**
154 * The following tables contain the expected throughput metrics for all rates
155 *
156 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
157 *
158 * where invalid entries are zeros.
159 *
160 * CCK rates are only valid in legacy table and will only be used in G
161 * (2.4 GHz) band.
162 */
163
164 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
165 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
166 };
167
168 static const u16 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
169 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202}, /* Norm */
170 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210}, /* SGI */
171 {0, 0, 0, 0, 47, 0, 91, 133, 171, 242, 305, 334, 362}, /* AGG */
172 {0, 0, 0, 0, 52, 0, 101, 145, 187, 264, 330, 361, 390}, /* AGG+SGI */
173 };
174
175 static const u16 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
176 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
177 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
178 {0, 0, 0, 0, 94, 0, 177, 249, 313, 423, 512, 550, 586}, /* AGG */
179 {0, 0, 0, 0, 104, 0, 193, 270, 338, 454, 545, 584, 620}, /* AGG+SGI */
180 };
181
182 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
183 {0, 0, 0, 0, 74, 0, 123, 155, 179, 214, 236, 244, 251}, /* Norm */
184 {0, 0, 0, 0, 81, 0, 131, 164, 188, 223, 243, 251, 257}, /* SGI */
185 {0, 0, 0, 0, 89, 0, 167, 235, 296, 402, 488, 526, 560}, /* AGG */
186 {0, 0, 0, 0, 97, 0, 182, 255, 320, 431, 520, 558, 593}, /* AGG+SGI*/
187 };
188
189 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
190 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
191 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
192 {0, 0, 0, 0, 171, 0, 305, 410, 496, 634, 731, 771, 805}, /* AGG */
193 {0, 0, 0, 0, 186, 0, 329, 439, 527, 667, 764, 803, 838}, /* AGG+SGI */
194 };
195
196 static const u16 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = {
197 {0, 0, 0, 0, 99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */
198 {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */
199 {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */
200 {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */
201 };
202
203 static const u16 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = {
204 {0, 0, 0, 0, 152, 0, 211, 239, 255, 279, 290, 294, 297}, /* Norm */
205 {0, 0, 0, 0, 160, 0, 219, 245, 261, 284, 294, 297, 300}, /* SGI */
206 {0, 0, 0, 0, 254, 0, 443, 584, 695, 868, 984, 1030, 1070}, /* AGG */
207 {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */
208 };
209
210 /* mbps, mcs */
211 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
212 { "1", "BPSK DSSS"},
213 { "2", "QPSK DSSS"},
214 {"5.5", "BPSK CCK"},
215 { "11", "QPSK CCK"},
216 { "6", "BPSK 1/2"},
217 { "9", "BPSK 1/2"},
218 { "12", "QPSK 1/2"},
219 { "18", "QPSK 3/4"},
220 { "24", "16QAM 1/2"},
221 { "36", "16QAM 3/4"},
222 { "48", "64QAM 2/3"},
223 { "54", "64QAM 3/4"},
224 { "60", "64QAM 5/6"},
225 };
226
227 #define MCS_INDEX_PER_STREAM (8)
228
229 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
230 {
231 window->data = 0;
232 window->success_counter = 0;
233 window->success_ratio = IWL_INVALID_VALUE;
234 window->counter = 0;
235 window->average_tpt = IWL_INVALID_VALUE;
236 window->stamp = 0;
237 }
238
239 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
240 {
241 return (ant_type & valid_antenna) == ant_type;
242 }
243
244 /*
245 * removes the old data from the statistics. All data that is older than
246 * TID_MAX_TIME_DIFF, will be deleted.
247 */
248 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
249 {
250 /* The oldest age we want to keep */
251 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
252
253 while (tl->queue_count &&
254 (tl->time_stamp < oldest_time)) {
255 tl->total -= tl->packet_count[tl->head];
256 tl->packet_count[tl->head] = 0;
257 tl->time_stamp += TID_QUEUE_CELL_SPACING;
258 tl->queue_count--;
259 tl->head++;
260 if (tl->head >= TID_QUEUE_MAX_SIZE)
261 tl->head = 0;
262 }
263 }
264
265 /*
266 * increment traffic load value for tid and also remove
267 * any old values if passed the certain time period
268 */
269 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
270 struct ieee80211_hdr *hdr)
271 {
272 u32 curr_time = jiffies_to_msecs(jiffies);
273 u32 time_diff;
274 s32 index;
275 struct iwl_traffic_load *tl = NULL;
276 u8 tid;
277
278 if (ieee80211_is_data_qos(hdr->frame_control)) {
279 u8 *qc = ieee80211_get_qos_ctl(hdr);
280 tid = qc[0] & 0xf;
281 } else
282 return IWL_MAX_TID_COUNT;
283
284 if (unlikely(tid >= IWL_MAX_TID_COUNT))
285 return IWL_MAX_TID_COUNT;
286
287 tl = &lq_data->load[tid];
288
289 curr_time -= curr_time % TID_ROUND_VALUE;
290
291 /* Happens only for the first packet. Initialize the data */
292 if (!(tl->queue_count)) {
293 tl->total = 1;
294 tl->time_stamp = curr_time;
295 tl->queue_count = 1;
296 tl->head = 0;
297 tl->packet_count[0] = 1;
298 return IWL_MAX_TID_COUNT;
299 }
300
301 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
302 index = time_diff / TID_QUEUE_CELL_SPACING;
303
304 /* The history is too long: remove data that is older than */
305 /* TID_MAX_TIME_DIFF */
306 if (index >= TID_QUEUE_MAX_SIZE)
307 rs_tl_rm_old_stats(tl, curr_time);
308
309 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
310 tl->packet_count[index] = tl->packet_count[index] + 1;
311 tl->total = tl->total + 1;
312
313 if ((index + 1) > tl->queue_count)
314 tl->queue_count = index + 1;
315
316 return tid;
317 }
318
319 #ifdef CONFIG_MAC80211_DEBUGFS
320 /**
321 * Program the device to use fixed rate for frame transmit
322 * This is for debugging/testing only
323 * once the device start use fixed rate, we need to reload the module
324 * to being back the normal operation.
325 */
326 static void rs_program_fix_rate(struct iwl_priv *priv,
327 struct iwl_lq_sta *lq_sta)
328 {
329 struct iwl_station_priv *sta_priv =
330 container_of(lq_sta, struct iwl_station_priv, lq_sta);
331 struct iwl_rxon_context *ctx = sta_priv->ctx;
332
333 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
334 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
335 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
336 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
337
338 IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
339 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
340
341 if (lq_sta->dbg_fixed_rate) {
342 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
343 iwl_send_lq_cmd(lq_sta->drv, ctx, &lq_sta->lq, CMD_ASYNC,
344 false);
345 }
346 }
347 #endif
348
349 /*
350 get the traffic load value for tid
351 */
352 static void rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
353 {
354 u32 curr_time = jiffies_to_msecs(jiffies);
355 u32 time_diff;
356 s32 index;
357 struct iwl_traffic_load *tl = NULL;
358
359 if (tid >= IWL_MAX_TID_COUNT)
360 return;
361
362 tl = &(lq_data->load[tid]);
363
364 curr_time -= curr_time % TID_ROUND_VALUE;
365
366 if (!(tl->queue_count))
367 return;
368
369 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
370 index = time_diff / TID_QUEUE_CELL_SPACING;
371
372 /* The history is too long: remove data that is older than */
373 /* TID_MAX_TIME_DIFF */
374 if (index >= TID_QUEUE_MAX_SIZE)
375 rs_tl_rm_old_stats(tl, curr_time);
376 }
377
378 static int rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
379 struct iwl_lq_sta *lq_data, u8 tid,
380 struct ieee80211_sta *sta)
381 {
382 int ret = -EAGAIN;
383
384 /*
385 * Don't create TX aggregation sessions when in high
386 * BT traffic, as they would just be disrupted by BT.
387 */
388 if (priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) {
389 IWL_DEBUG_COEX(priv,
390 "BT traffic (%d), no aggregation allowed\n",
391 priv->bt_traffic_load);
392 return ret;
393 }
394
395 rs_tl_get_load(lq_data, tid);
396
397 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
398 sta->addr, tid);
399 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
400 if (ret == -EAGAIN) {
401 /*
402 * driver and mac80211 is out of sync
403 * this might be cause by reloading firmware
404 * stop the tx ba session here
405 */
406 IWL_ERR(priv, "Fail start Tx agg on tid: %d\n",
407 tid);
408 ieee80211_stop_tx_ba_session(sta, tid);
409 }
410 return ret;
411 }
412
413 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
414 struct iwl_lq_sta *lq_data,
415 struct ieee80211_sta *sta)
416 {
417 if (tid < IWL_MAX_TID_COUNT)
418 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
419 else
420 IWL_ERR(priv, "tid exceeds max TID count: %d/%d\n",
421 tid, IWL_MAX_TID_COUNT);
422 }
423
424 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
425 {
426 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
427 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
428 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
429 }
430
431 /*
432 * Static function to get the expected throughput from an iwl_scale_tbl_info
433 * that wraps a NULL pointer check
434 */
435 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
436 {
437 if (tbl->expected_tpt)
438 return tbl->expected_tpt[rs_index];
439 return 0;
440 }
441
442 /**
443 * rs_collect_tx_data - Update the success/failure sliding window
444 *
445 * We keep a sliding window of the last 62 packets transmitted
446 * at this rate. window->data contains the bitmask of successful
447 * packets.
448 */
449 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
450 int scale_index, int attempts, int successes)
451 {
452 struct iwl_rate_scale_data *window = NULL;
453 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
454 s32 fail_count, tpt;
455
456 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
457 return -EINVAL;
458
459 /* Select window for current tx bit rate */
460 window = &(tbl->win[scale_index]);
461
462 /* Get expected throughput */
463 tpt = get_expected_tpt(tbl, scale_index);
464
465 /*
466 * Keep track of only the latest 62 tx frame attempts in this rate's
467 * history window; anything older isn't really relevant any more.
468 * If we have filled up the sliding window, drop the oldest attempt;
469 * if the oldest attempt (highest bit in bitmap) shows "success",
470 * subtract "1" from the success counter (this is the main reason
471 * we keep these bitmaps!).
472 */
473 while (attempts > 0) {
474 if (window->counter >= IWL_RATE_MAX_WINDOW) {
475
476 /* remove earliest */
477 window->counter = IWL_RATE_MAX_WINDOW - 1;
478
479 if (window->data & mask) {
480 window->data &= ~mask;
481 window->success_counter--;
482 }
483 }
484
485 /* Increment frames-attempted counter */
486 window->counter++;
487
488 /* Shift bitmap by one frame to throw away oldest history */
489 window->data <<= 1;
490
491 /* Mark the most recent #successes attempts as successful */
492 if (successes > 0) {
493 window->success_counter++;
494 window->data |= 0x1;
495 successes--;
496 }
497
498 attempts--;
499 }
500
501 /* Calculate current success ratio, avoid divide-by-0! */
502 if (window->counter > 0)
503 window->success_ratio = 128 * (100 * window->success_counter)
504 / window->counter;
505 else
506 window->success_ratio = IWL_INVALID_VALUE;
507
508 fail_count = window->counter - window->success_counter;
509
510 /* Calculate average throughput, if we have enough history. */
511 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
512 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
513 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
514 else
515 window->average_tpt = IWL_INVALID_VALUE;
516
517 /* Tag this window as having been updated */
518 window->stamp = jiffies;
519
520 return 0;
521 }
522
523 /*
524 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
525 */
526 /* FIXME:RS:remove this function and put the flags statically in the table */
527 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
528 struct iwl_scale_tbl_info *tbl,
529 int index, u8 use_green)
530 {
531 u32 rate_n_flags = 0;
532
533 if (is_legacy(tbl->lq_type)) {
534 rate_n_flags = iwl_rates[index].plcp;
535 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
536 rate_n_flags |= RATE_MCS_CCK_MSK;
537
538 } else if (is_Ht(tbl->lq_type)) {
539 if (index > IWL_LAST_OFDM_RATE) {
540 IWL_ERR(priv, "Invalid HT rate index %d\n", index);
541 index = IWL_LAST_OFDM_RATE;
542 }
543 rate_n_flags = RATE_MCS_HT_MSK;
544
545 if (is_siso(tbl->lq_type))
546 rate_n_flags |= iwl_rates[index].plcp_siso;
547 else if (is_mimo2(tbl->lq_type))
548 rate_n_flags |= iwl_rates[index].plcp_mimo2;
549 else
550 rate_n_flags |= iwl_rates[index].plcp_mimo3;
551 } else {
552 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
553 }
554
555 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
556 RATE_MCS_ANT_ABC_MSK);
557
558 if (is_Ht(tbl->lq_type)) {
559 if (tbl->is_ht40) {
560 if (tbl->is_dup)
561 rate_n_flags |= RATE_MCS_DUP_MSK;
562 else
563 rate_n_flags |= RATE_MCS_HT40_MSK;
564 }
565 if (tbl->is_SGI)
566 rate_n_flags |= RATE_MCS_SGI_MSK;
567
568 if (use_green) {
569 rate_n_flags |= RATE_MCS_GF_MSK;
570 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
571 rate_n_flags &= ~RATE_MCS_SGI_MSK;
572 IWL_ERR(priv, "GF was set with SGI:SISO\n");
573 }
574 }
575 }
576 return rate_n_flags;
577 }
578
579 /*
580 * Interpret uCode API's rate_n_flags format,
581 * fill "search" or "active" tx mode table.
582 */
583 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
584 enum nl80211_band band,
585 struct iwl_scale_tbl_info *tbl,
586 int *rate_idx)
587 {
588 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
589 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
590 u8 mcs;
591
592 memset(tbl, 0, sizeof(struct iwl_scale_tbl_info));
593 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
594
595 if (*rate_idx == IWL_RATE_INVALID) {
596 *rate_idx = -1;
597 return -EINVAL;
598 }
599 tbl->is_SGI = 0; /* default legacy setup */
600 tbl->is_ht40 = 0;
601 tbl->is_dup = 0;
602 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
603 tbl->lq_type = LQ_NONE;
604 tbl->max_search = IWL_MAX_SEARCH;
605
606 /* legacy rate format */
607 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
608 if (num_of_ant == 1) {
609 if (band == NL80211_BAND_5GHZ)
610 tbl->lq_type = LQ_A;
611 else
612 tbl->lq_type = LQ_G;
613 }
614 /* HT rate format */
615 } else {
616 if (rate_n_flags & RATE_MCS_SGI_MSK)
617 tbl->is_SGI = 1;
618
619 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
620 (rate_n_flags & RATE_MCS_DUP_MSK))
621 tbl->is_ht40 = 1;
622
623 if (rate_n_flags & RATE_MCS_DUP_MSK)
624 tbl->is_dup = 1;
625
626 mcs = rs_extract_rate(rate_n_flags);
627
628 /* SISO */
629 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
630 if (num_of_ant == 1)
631 tbl->lq_type = LQ_SISO; /*else NONE*/
632 /* MIMO2 */
633 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
634 if (num_of_ant == 2)
635 tbl->lq_type = LQ_MIMO2;
636 /* MIMO3 */
637 } else {
638 if (num_of_ant == 3) {
639 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
640 tbl->lq_type = LQ_MIMO3;
641 }
642 }
643 }
644 return 0;
645 }
646
647 /* switch to another antenna/antennas and return 1 */
648 /* if no other valid antenna found, return 0 */
649 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
650 struct iwl_scale_tbl_info *tbl)
651 {
652 u8 new_ant_type;
653
654 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
655 return 0;
656
657 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
658 return 0;
659
660 new_ant_type = ant_toggle_lookup[tbl->ant_type];
661
662 while ((new_ant_type != tbl->ant_type) &&
663 !rs_is_valid_ant(valid_ant, new_ant_type))
664 new_ant_type = ant_toggle_lookup[new_ant_type];
665
666 if (new_ant_type == tbl->ant_type)
667 return 0;
668
669 tbl->ant_type = new_ant_type;
670 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
671 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
672 return 1;
673 }
674
675 /**
676 * Green-field mode is valid if the station supports it and
677 * there are no non-GF stations present in the BSS.
678 */
679 static bool rs_use_green(struct ieee80211_sta *sta)
680 {
681 /*
682 * There's a bug somewhere in this code that causes the
683 * scaling to get stuck because GF+SGI can't be combined
684 * in SISO rates. Until we find that bug, disable GF, it
685 * has only limited benefit and we still interoperate with
686 * GF APs since we can always receive GF transmissions.
687 */
688 return false;
689 }
690
691 /**
692 * rs_get_supported_rates - get the available rates
693 *
694 * if management frame or broadcast frame only return
695 * basic available rates.
696 *
697 */
698 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
699 struct ieee80211_hdr *hdr,
700 enum iwl_table_type rate_type)
701 {
702 if (is_legacy(rate_type)) {
703 return lq_sta->active_legacy_rate;
704 } else {
705 if (is_siso(rate_type))
706 return lq_sta->active_siso_rate;
707 else if (is_mimo2(rate_type))
708 return lq_sta->active_mimo2_rate;
709 else
710 return lq_sta->active_mimo3_rate;
711 }
712 }
713
714 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
715 int rate_type)
716 {
717 u8 high = IWL_RATE_INVALID;
718 u8 low = IWL_RATE_INVALID;
719
720 /* 802.11A or ht walks to the next literal adjacent rate in
721 * the rate table */
722 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
723 int i;
724 u32 mask;
725
726 /* Find the previous rate that is in the rate mask */
727 i = index - 1;
728 if (i >= 0)
729 mask = BIT(i);
730
731 for (; i >= 0; i--, mask >>= 1) {
732 if (rate_mask & mask) {
733 low = i;
734 break;
735 }
736 }
737
738 /* Find the next rate that is in the rate mask */
739 i = index + 1;
740 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
741 if (rate_mask & mask) {
742 high = i;
743 break;
744 }
745 }
746
747 return (high << 8) | low;
748 }
749
750 low = index;
751 while (low != IWL_RATE_INVALID) {
752 low = iwl_rates[low].prev_rs;
753 if (low == IWL_RATE_INVALID)
754 break;
755 if (rate_mask & (1 << low))
756 break;
757 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
758 }
759
760 high = index;
761 while (high != IWL_RATE_INVALID) {
762 high = iwl_rates[high].next_rs;
763 if (high == IWL_RATE_INVALID)
764 break;
765 if (rate_mask & (1 << high))
766 break;
767 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
768 }
769
770 return (high << 8) | low;
771 }
772
773 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
774 struct iwl_scale_tbl_info *tbl,
775 u8 scale_index, u8 ht_possible)
776 {
777 s32 low;
778 u16 rate_mask;
779 u16 high_low;
780 u8 switch_to_legacy = 0;
781 u8 is_green = lq_sta->is_green;
782 struct iwl_priv *priv = lq_sta->drv;
783
784 /* check if we need to switch from HT to legacy rates.
785 * assumption is that mandatory rates (1Mbps or 6Mbps)
786 * are always supported (spec demand) */
787 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
788 switch_to_legacy = 1;
789 scale_index = rs_ht_to_legacy[scale_index];
790 if (lq_sta->band == NL80211_BAND_5GHZ)
791 tbl->lq_type = LQ_A;
792 else
793 tbl->lq_type = LQ_G;
794
795 if (num_of_ant(tbl->ant_type) > 1)
796 tbl->ant_type =
797 first_antenna(priv->nvm_data->valid_tx_ant);
798
799 tbl->is_ht40 = 0;
800 tbl->is_SGI = 0;
801 tbl->max_search = IWL_MAX_SEARCH;
802 }
803
804 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
805
806 /* Mask with station rate restriction */
807 if (is_legacy(tbl->lq_type)) {
808 /* supp_rates has no CCK bits in A mode */
809 if (lq_sta->band == NL80211_BAND_5GHZ)
810 rate_mask = (u16)(rate_mask &
811 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
812 else
813 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
814 }
815
816 /* If we switched from HT to legacy, check current rate */
817 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
818 low = scale_index;
819 goto out;
820 }
821
822 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
823 tbl->lq_type);
824 low = high_low & 0xff;
825
826 if (low == IWL_RATE_INVALID)
827 low = scale_index;
828
829 out:
830 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
831 }
832
833 /*
834 * Simple function to compare two rate scale table types
835 */
836 static bool table_type_matches(struct iwl_scale_tbl_info *a,
837 struct iwl_scale_tbl_info *b)
838 {
839 return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
840 (a->is_SGI == b->is_SGI);
841 }
842
843 static void rs_bt_update_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
844 struct iwl_lq_sta *lq_sta)
845 {
846 struct iwl_scale_tbl_info *tbl;
847 bool full_concurrent = priv->bt_full_concurrent;
848
849 if (priv->bt_ant_couple_ok) {
850 /*
851 * Is there a need to switch between
852 * full concurrency and 3-wire?
853 */
854 if (priv->bt_ci_compliance)
855 full_concurrent = true;
856 else
857 full_concurrent = false;
858 }
859 if ((priv->bt_traffic_load != priv->last_bt_traffic_load) ||
860 (priv->bt_full_concurrent != full_concurrent)) {
861 priv->bt_full_concurrent = full_concurrent;
862 priv->last_bt_traffic_load = priv->bt_traffic_load;
863
864 /* Update uCode's rate table. */
865 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
866 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
867 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
868
869 queue_work(priv->workqueue, &priv->bt_full_concurrency);
870 }
871 }
872
873 /*
874 * mac80211 sends us Tx status
875 */
876 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
877 struct ieee80211_sta *sta, void *priv_sta,
878 struct sk_buff *skb)
879 {
880 int legacy_success;
881 int retries;
882 int rs_index, mac_index, i;
883 struct iwl_lq_sta *lq_sta = priv_sta;
884 struct iwl_link_quality_cmd *table;
885 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
886 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)priv_r;
887 struct iwl_priv *priv = IWL_OP_MODE_GET_DVM(op_mode);
888 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
889 enum mac80211_rate_control_flags mac_flags;
890 u32 tx_rate;
891 struct iwl_scale_tbl_info tbl_type;
892 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
893 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
894 struct iwl_rxon_context *ctx = sta_priv->ctx;
895
896 IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
897
898 /* Treat uninitialized rate scaling data same as non-existing. */
899 if (!lq_sta) {
900 IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n");
901 return;
902 } else if (!lq_sta->drv) {
903 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
904 return;
905 }
906
907 if (!ieee80211_is_data(hdr->frame_control) ||
908 info->flags & IEEE80211_TX_CTL_NO_ACK)
909 return;
910
911 /* This packet was aggregated but doesn't carry status info */
912 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
913 !(info->flags & IEEE80211_TX_STAT_AMPDU))
914 return;
915
916 /*
917 * Ignore this Tx frame response if its initial rate doesn't match
918 * that of latest Link Quality command. There may be stragglers
919 * from a previous Link Quality command, but we're no longer interested
920 * in those; they're either from the "active" mode while we're trying
921 * to check "search" mode, or a prior "search" mode after we've moved
922 * to a new "search" mode (which might become the new "active" mode).
923 */
924 table = &lq_sta->lq;
925 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
926 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
927 if (priv->band == NL80211_BAND_5GHZ)
928 rs_index -= IWL_FIRST_OFDM_RATE;
929 mac_flags = info->status.rates[0].flags;
930 mac_index = info->status.rates[0].idx;
931 /* For HT packets, map MCS to PLCP */
932 if (mac_flags & IEEE80211_TX_RC_MCS) {
933 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
934 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
935 mac_index++;
936 /*
937 * mac80211 HT index is always zero-indexed; we need to move
938 * HT OFDM rates after CCK rates in 2.4 GHz band
939 */
940 if (priv->band == NL80211_BAND_2GHZ)
941 mac_index += IWL_FIRST_OFDM_RATE;
942 }
943 /* Here we actually compare this rate to the latest LQ command */
944 if ((mac_index < 0) ||
945 (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
946 (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
947 (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
948 (tbl_type.ant_type != info->status.antenna) ||
949 (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
950 (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
951 (rs_index != mac_index)) {
952 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate);
953 /*
954 * Since rates mis-match, the last LQ command may have failed.
955 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
956 * ... driver.
957 */
958 lq_sta->missed_rate_counter++;
959 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
960 lq_sta->missed_rate_counter = 0;
961 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
962 }
963 /* Regardless, ignore this status info for outdated rate */
964 return;
965 } else
966 /* Rate did match, so reset the missed_rate_counter */
967 lq_sta->missed_rate_counter = 0;
968
969 /* Figure out if rate scale algorithm is in active or search table */
970 if (table_type_matches(&tbl_type,
971 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
972 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
973 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
974 } else if (table_type_matches(&tbl_type,
975 &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
976 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
977 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
978 } else {
979 IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n");
980 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
981 IWL_DEBUG_RATE(priv, "active- lq:%x, ant:%x, SGI:%d\n",
982 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
983 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
984 IWL_DEBUG_RATE(priv, "search- lq:%x, ant:%x, SGI:%d\n",
985 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
986 IWL_DEBUG_RATE(priv, "actual- lq:%x, ant:%x, SGI:%d\n",
987 tbl_type.lq_type, tbl_type.ant_type, tbl_type.is_SGI);
988 /*
989 * no matching table found, let's by-pass the data collection
990 * and continue to perform rate scale to find the rate table
991 */
992 rs_stay_in_table(lq_sta, true);
993 goto done;
994 }
995
996 /*
997 * Updating the frame history depends on whether packets were
998 * aggregated.
999 *
1000 * For aggregation, all packets were transmitted at the same rate, the
1001 * first index into rate scale table.
1002 */
1003 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1004 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
1005 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
1006 &rs_index);
1007 rs_collect_tx_data(curr_tbl, rs_index,
1008 info->status.ampdu_len,
1009 info->status.ampdu_ack_len);
1010
1011 /* Update success/fail counts if not searching for new mode */
1012 if (lq_sta->stay_in_tbl) {
1013 lq_sta->total_success += info->status.ampdu_ack_len;
1014 lq_sta->total_failed += (info->status.ampdu_len -
1015 info->status.ampdu_ack_len);
1016 }
1017 } else {
1018 /*
1019 * For legacy, update frame history with for each Tx retry.
1020 */
1021 retries = info->status.rates[0].count - 1;
1022 /* HW doesn't send more than 15 retries */
1023 retries = min(retries, 15);
1024
1025 /* The last transmission may have been successful */
1026 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1027 /* Collect data for each rate used during failed TX attempts */
1028 for (i = 0; i <= retries; ++i) {
1029 tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
1030 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
1031 &tbl_type, &rs_index);
1032 /*
1033 * Only collect stats if retried rate is in the same RS
1034 * table as active/search.
1035 */
1036 if (table_type_matches(&tbl_type, curr_tbl))
1037 tmp_tbl = curr_tbl;
1038 else if (table_type_matches(&tbl_type, other_tbl))
1039 tmp_tbl = other_tbl;
1040 else
1041 continue;
1042 rs_collect_tx_data(tmp_tbl, rs_index, 1,
1043 i < retries ? 0 : legacy_success);
1044 }
1045
1046 /* Update success/fail counts if not searching for new mode */
1047 if (lq_sta->stay_in_tbl) {
1048 lq_sta->total_success += legacy_success;
1049 lq_sta->total_failed += retries + (1 - legacy_success);
1050 }
1051 }
1052 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1053 lq_sta->last_rate_n_flags = tx_rate;
1054 done:
1055 /* See if there's a better rate or modulation mode to try. */
1056 if (sta && sta->supp_rates[sband->band])
1057 rs_rate_scale_perform(priv, skb, sta, lq_sta);
1058
1059 if (priv->lib->bt_params && priv->lib->bt_params->advanced_bt_coexist)
1060 rs_bt_update_lq(priv, ctx, lq_sta);
1061 }
1062
1063 /*
1064 * Begin a period of staying with a selected modulation mode.
1065 * Set "stay_in_tbl" flag to prevent any mode switches.
1066 * Set frame tx success limits according to legacy vs. high-throughput,
1067 * and reset overall (spanning all rates) tx success history statistics.
1068 * These control how long we stay using same modulation mode before
1069 * searching for a new mode.
1070 */
1071 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
1072 struct iwl_lq_sta *lq_sta)
1073 {
1074 IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
1075 lq_sta->stay_in_tbl = 1; /* only place this gets set */
1076 if (is_legacy) {
1077 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1078 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1079 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1080 } else {
1081 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1082 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1083 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1084 }
1085 lq_sta->table_count = 0;
1086 lq_sta->total_failed = 0;
1087 lq_sta->total_success = 0;
1088 lq_sta->flush_timer = jiffies;
1089 lq_sta->action_counter = 0;
1090 }
1091
1092 /*
1093 * Find correct throughput table for given mode of modulation
1094 */
1095 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1096 struct iwl_scale_tbl_info *tbl)
1097 {
1098 /* Used to choose among HT tables */
1099 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1100
1101 /* Check for invalid LQ type */
1102 if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1103 tbl->expected_tpt = expected_tpt_legacy;
1104 return;
1105 }
1106
1107 /* Legacy rates have only one table */
1108 if (is_legacy(tbl->lq_type)) {
1109 tbl->expected_tpt = expected_tpt_legacy;
1110 return;
1111 }
1112
1113 /* Choose among many HT tables depending on number of streams
1114 * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
1115 * status */
1116 if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1117 ht_tbl_pointer = expected_tpt_siso20MHz;
1118 else if (is_siso(tbl->lq_type))
1119 ht_tbl_pointer = expected_tpt_siso40MHz;
1120 else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1121 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1122 else if (is_mimo2(tbl->lq_type))
1123 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1124 else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1125 ht_tbl_pointer = expected_tpt_mimo3_20MHz;
1126 else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
1127 ht_tbl_pointer = expected_tpt_mimo3_40MHz;
1128
1129 if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */
1130 tbl->expected_tpt = ht_tbl_pointer[0];
1131 else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */
1132 tbl->expected_tpt = ht_tbl_pointer[1];
1133 else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */
1134 tbl->expected_tpt = ht_tbl_pointer[2];
1135 else /* AGG+SGI */
1136 tbl->expected_tpt = ht_tbl_pointer[3];
1137 }
1138
1139 /*
1140 * Find starting rate for new "search" high-throughput mode of modulation.
1141 * Goal is to find lowest expected rate (under perfect conditions) that is
1142 * above the current measured throughput of "active" mode, to give new mode
1143 * a fair chance to prove itself without too many challenges.
1144 *
1145 * This gets called when transitioning to more aggressive modulation
1146 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1147 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1148 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1149 * bit rate will typically need to increase, but not if performance was bad.
1150 */
1151 static s32 rs_get_best_rate(struct iwl_priv *priv,
1152 struct iwl_lq_sta *lq_sta,
1153 struct iwl_scale_tbl_info *tbl, /* "search" */
1154 u16 rate_mask, s8 index)
1155 {
1156 /* "active" values */
1157 struct iwl_scale_tbl_info *active_tbl =
1158 &(lq_sta->lq_info[lq_sta->active_tbl]);
1159 s32 active_sr = active_tbl->win[index].success_ratio;
1160 s32 active_tpt = active_tbl->expected_tpt[index];
1161 /* expected "search" throughput */
1162 const u16 *tpt_tbl = tbl->expected_tpt;
1163
1164 s32 new_rate, high, low, start_hi;
1165 u16 high_low;
1166 s8 rate = index;
1167
1168 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1169
1170 for (; ;) {
1171 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1172 tbl->lq_type);
1173
1174 low = high_low & 0xff;
1175 high = (high_low >> 8) & 0xff;
1176
1177 /*
1178 * Lower the "search" bit rate, to give new "search" mode
1179 * approximately the same throughput as "active" if:
1180 *
1181 * 1) "Active" mode has been working modestly well (but not
1182 * great), and expected "search" throughput (under perfect
1183 * conditions) at candidate rate is above the actual
1184 * measured "active" throughput (but less than expected
1185 * "active" throughput under perfect conditions).
1186 * OR
1187 * 2) "Active" mode has been working perfectly or very well
1188 * and expected "search" throughput (under perfect
1189 * conditions) at candidate rate is above expected
1190 * "active" throughput (under perfect conditions).
1191 */
1192 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1193 ((active_sr > IWL_RATE_DECREASE_TH) &&
1194 (active_sr <= IWL_RATE_HIGH_TH) &&
1195 (tpt_tbl[rate] <= active_tpt))) ||
1196 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1197 (tpt_tbl[rate] > active_tpt))) {
1198
1199 /* (2nd or later pass)
1200 * If we've already tried to raise the rate, and are
1201 * now trying to lower it, use the higher rate. */
1202 if (start_hi != IWL_RATE_INVALID) {
1203 new_rate = start_hi;
1204 break;
1205 }
1206
1207 new_rate = rate;
1208
1209 /* Loop again with lower rate */
1210 if (low != IWL_RATE_INVALID)
1211 rate = low;
1212
1213 /* Lower rate not available, use the original */
1214 else
1215 break;
1216
1217 /* Else try to raise the "search" rate to match "active" */
1218 } else {
1219 /* (2nd or later pass)
1220 * If we've already tried to lower the rate, and are
1221 * now trying to raise it, use the lower rate. */
1222 if (new_rate != IWL_RATE_INVALID)
1223 break;
1224
1225 /* Loop again with higher rate */
1226 else if (high != IWL_RATE_INVALID) {
1227 start_hi = high;
1228 rate = high;
1229
1230 /* Higher rate not available, use the original */
1231 } else {
1232 new_rate = rate;
1233 break;
1234 }
1235 }
1236 }
1237
1238 return new_rate;
1239 }
1240
1241 /*
1242 * Set up search table for MIMO2
1243 */
1244 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1245 struct iwl_lq_sta *lq_sta,
1246 struct ieee80211_conf *conf,
1247 struct ieee80211_sta *sta,
1248 struct iwl_scale_tbl_info *tbl, int index)
1249 {
1250 u16 rate_mask;
1251 s32 rate;
1252 s8 is_green = lq_sta->is_green;
1253 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1254 struct iwl_rxon_context *ctx = sta_priv->ctx;
1255
1256 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1257 return -1;
1258
1259 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
1260 return -1;
1261
1262 /* Need both Tx chains/antennas to support MIMO */
1263 if (priv->hw_params.tx_chains_num < 2)
1264 return -1;
1265
1266 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1267
1268 tbl->lq_type = LQ_MIMO2;
1269 tbl->is_dup = lq_sta->is_dup;
1270 tbl->action = 0;
1271 tbl->max_search = IWL_MAX_SEARCH;
1272 rate_mask = lq_sta->active_mimo2_rate;
1273
1274 if (iwl_is_ht40_tx_allowed(priv, ctx, sta))
1275 tbl->is_ht40 = 1;
1276 else
1277 tbl->is_ht40 = 0;
1278
1279 rs_set_expected_tpt_table(lq_sta, tbl);
1280
1281 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1282
1283 IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1284 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1285 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1286 rate, rate_mask);
1287 return -1;
1288 }
1289 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1290
1291 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1292 tbl->current_rate, is_green);
1293 return 0;
1294 }
1295
1296 /*
1297 * Set up search table for MIMO3
1298 */
1299 static int rs_switch_to_mimo3(struct iwl_priv *priv,
1300 struct iwl_lq_sta *lq_sta,
1301 struct ieee80211_conf *conf,
1302 struct ieee80211_sta *sta,
1303 struct iwl_scale_tbl_info *tbl, int index)
1304 {
1305 u16 rate_mask;
1306 s32 rate;
1307 s8 is_green = lq_sta->is_green;
1308 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1309 struct iwl_rxon_context *ctx = sta_priv->ctx;
1310
1311 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1312 return -1;
1313
1314 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
1315 return -1;
1316
1317 /* Need both Tx chains/antennas to support MIMO */
1318 if (priv->hw_params.tx_chains_num < 3)
1319 return -1;
1320
1321 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1322
1323 tbl->lq_type = LQ_MIMO3;
1324 tbl->is_dup = lq_sta->is_dup;
1325 tbl->action = 0;
1326 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1327 rate_mask = lq_sta->active_mimo3_rate;
1328
1329 if (iwl_is_ht40_tx_allowed(priv, ctx, sta))
1330 tbl->is_ht40 = 1;
1331 else
1332 tbl->is_ht40 = 0;
1333
1334 rs_set_expected_tpt_table(lq_sta, tbl);
1335
1336 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1337
1338 IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1339 rate, rate_mask);
1340 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1341 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1342 rate, rate_mask);
1343 return -1;
1344 }
1345 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1346
1347 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1348 tbl->current_rate, is_green);
1349 return 0;
1350 }
1351
1352 /*
1353 * Set up search table for SISO
1354 */
1355 static int rs_switch_to_siso(struct iwl_priv *priv,
1356 struct iwl_lq_sta *lq_sta,
1357 struct ieee80211_conf *conf,
1358 struct ieee80211_sta *sta,
1359 struct iwl_scale_tbl_info *tbl, int index)
1360 {
1361 u16 rate_mask;
1362 u8 is_green = lq_sta->is_green;
1363 s32 rate;
1364 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1365 struct iwl_rxon_context *ctx = sta_priv->ctx;
1366
1367 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1368 return -1;
1369
1370 IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1371
1372 tbl->is_dup = lq_sta->is_dup;
1373 tbl->lq_type = LQ_SISO;
1374 tbl->action = 0;
1375 tbl->max_search = IWL_MAX_SEARCH;
1376 rate_mask = lq_sta->active_siso_rate;
1377
1378 if (iwl_is_ht40_tx_allowed(priv, ctx, sta))
1379 tbl->is_ht40 = 1;
1380 else
1381 tbl->is_ht40 = 0;
1382
1383 if (is_green)
1384 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1385
1386 rs_set_expected_tpt_table(lq_sta, tbl);
1387 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1388
1389 IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1390 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1391 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1392 rate, rate_mask);
1393 return -1;
1394 }
1395 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1396 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1397 tbl->current_rate, is_green);
1398 return 0;
1399 }
1400
1401 /*
1402 * Try to switch to new modulation mode from legacy
1403 */
1404 static void rs_move_legacy_other(struct iwl_priv *priv,
1405 struct iwl_lq_sta *lq_sta,
1406 struct ieee80211_conf *conf,
1407 struct ieee80211_sta *sta,
1408 int index)
1409 {
1410 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1411 struct iwl_scale_tbl_info *search_tbl =
1412 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1413 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1414 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1415 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1416 u8 start_action;
1417 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1418 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1419 int ret = 0;
1420 u8 update_search_tbl_counter = 0;
1421
1422 switch (priv->bt_traffic_load) {
1423 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1424 /* nothing */
1425 break;
1426 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1427 /* avoid antenna B unless MIMO */
1428 if (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2)
1429 tbl->action = IWL_LEGACY_SWITCH_SISO;
1430 break;
1431 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1432 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1433 /* avoid antenna B and MIMO */
1434 valid_tx_ant =
1435 first_antenna(priv->nvm_data->valid_tx_ant);
1436 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2 &&
1437 tbl->action != IWL_LEGACY_SWITCH_SISO)
1438 tbl->action = IWL_LEGACY_SWITCH_SISO;
1439 break;
1440 default:
1441 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load);
1442 break;
1443 }
1444
1445 if (!iwl_ht_enabled(priv))
1446 /* stay in Legacy */
1447 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1448 else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1449 tbl->action > IWL_LEGACY_SWITCH_SISO)
1450 tbl->action = IWL_LEGACY_SWITCH_SISO;
1451
1452 /* configure as 1x1 if bt full concurrency */
1453 if (priv->bt_full_concurrent) {
1454 if (!iwl_ht_enabled(priv))
1455 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1456 else if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1457 tbl->action = IWL_LEGACY_SWITCH_SISO;
1458 valid_tx_ant =
1459 first_antenna(priv->nvm_data->valid_tx_ant);
1460 }
1461
1462 start_action = tbl->action;
1463 for (; ;) {
1464 lq_sta->action_counter++;
1465 switch (tbl->action) {
1466 case IWL_LEGACY_SWITCH_ANTENNA1:
1467 case IWL_LEGACY_SWITCH_ANTENNA2:
1468 IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1469
1470 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1471 tx_chains_num <= 1) ||
1472 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1473 tx_chains_num <= 2))
1474 break;
1475
1476 /* Don't change antenna if success has been great */
1477 if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1478 !priv->bt_full_concurrent &&
1479 priv->bt_traffic_load ==
1480 IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1481 break;
1482
1483 /* Set up search table to try other antenna */
1484 memcpy(search_tbl, tbl, sz);
1485
1486 if (rs_toggle_antenna(valid_tx_ant,
1487 &search_tbl->current_rate, search_tbl)) {
1488 update_search_tbl_counter = 1;
1489 rs_set_expected_tpt_table(lq_sta, search_tbl);
1490 goto out;
1491 }
1492 break;
1493 case IWL_LEGACY_SWITCH_SISO:
1494 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1495
1496 /* Set up search table to try SISO */
1497 memcpy(search_tbl, tbl, sz);
1498 search_tbl->is_SGI = 0;
1499 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1500 search_tbl, index);
1501 if (!ret) {
1502 lq_sta->action_counter = 0;
1503 goto out;
1504 }
1505
1506 break;
1507 case IWL_LEGACY_SWITCH_MIMO2_AB:
1508 case IWL_LEGACY_SWITCH_MIMO2_AC:
1509 case IWL_LEGACY_SWITCH_MIMO2_BC:
1510 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1511
1512 /* Set up search table to try MIMO */
1513 memcpy(search_tbl, tbl, sz);
1514 search_tbl->is_SGI = 0;
1515
1516 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1517 search_tbl->ant_type = ANT_AB;
1518 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1519 search_tbl->ant_type = ANT_AC;
1520 else
1521 search_tbl->ant_type = ANT_BC;
1522
1523 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1524 break;
1525
1526 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1527 search_tbl, index);
1528 if (!ret) {
1529 lq_sta->action_counter = 0;
1530 goto out;
1531 }
1532 break;
1533
1534 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1535 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1536
1537 /* Set up search table to try MIMO3 */
1538 memcpy(search_tbl, tbl, sz);
1539 search_tbl->is_SGI = 0;
1540
1541 search_tbl->ant_type = ANT_ABC;
1542
1543 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1544 break;
1545
1546 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1547 search_tbl, index);
1548 if (!ret) {
1549 lq_sta->action_counter = 0;
1550 goto out;
1551 }
1552 break;
1553 }
1554 tbl->action++;
1555 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1556 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1557
1558 if (tbl->action == start_action)
1559 break;
1560
1561 }
1562 search_tbl->lq_type = LQ_NONE;
1563 return;
1564
1565 out:
1566 lq_sta->search_better_tbl = 1;
1567 tbl->action++;
1568 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1569 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1570 if (update_search_tbl_counter)
1571 search_tbl->action = tbl->action;
1572 }
1573
1574 /*
1575 * Try to switch to new modulation mode from SISO
1576 */
1577 static void rs_move_siso_to_other(struct iwl_priv *priv,
1578 struct iwl_lq_sta *lq_sta,
1579 struct ieee80211_conf *conf,
1580 struct ieee80211_sta *sta, int index)
1581 {
1582 u8 is_green = lq_sta->is_green;
1583 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1584 struct iwl_scale_tbl_info *search_tbl =
1585 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1586 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1587 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1588 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1589 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1590 u8 start_action;
1591 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1592 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1593 u8 update_search_tbl_counter = 0;
1594 int ret;
1595
1596 switch (priv->bt_traffic_load) {
1597 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1598 /* nothing */
1599 break;
1600 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1601 /* avoid antenna B unless MIMO */
1602 if (tbl->action == IWL_SISO_SWITCH_ANTENNA2)
1603 tbl->action = IWL_SISO_SWITCH_MIMO2_AB;
1604 break;
1605 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1606 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1607 /* avoid antenna B and MIMO */
1608 valid_tx_ant =
1609 first_antenna(priv->nvm_data->valid_tx_ant);
1610 if (tbl->action != IWL_SISO_SWITCH_ANTENNA1)
1611 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1612 break;
1613 default:
1614 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load);
1615 break;
1616 }
1617
1618 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1619 tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1620 /* stay in SISO */
1621 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1622 }
1623
1624 /* configure as 1x1 if bt full concurrency */
1625 if (priv->bt_full_concurrent) {
1626 valid_tx_ant =
1627 first_antenna(priv->nvm_data->valid_tx_ant);
1628 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1629 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1630 }
1631
1632 start_action = tbl->action;
1633 for (;;) {
1634 lq_sta->action_counter++;
1635 switch (tbl->action) {
1636 case IWL_SISO_SWITCH_ANTENNA1:
1637 case IWL_SISO_SWITCH_ANTENNA2:
1638 IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1639 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1640 tx_chains_num <= 1) ||
1641 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1642 tx_chains_num <= 2))
1643 break;
1644
1645 if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1646 !priv->bt_full_concurrent &&
1647 priv->bt_traffic_load ==
1648 IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1649 break;
1650
1651 memcpy(search_tbl, tbl, sz);
1652 if (rs_toggle_antenna(valid_tx_ant,
1653 &search_tbl->current_rate, search_tbl)) {
1654 update_search_tbl_counter = 1;
1655 goto out;
1656 }
1657 break;
1658 case IWL_SISO_SWITCH_MIMO2_AB:
1659 case IWL_SISO_SWITCH_MIMO2_AC:
1660 case IWL_SISO_SWITCH_MIMO2_BC:
1661 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1662 memcpy(search_tbl, tbl, sz);
1663 search_tbl->is_SGI = 0;
1664
1665 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1666 search_tbl->ant_type = ANT_AB;
1667 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1668 search_tbl->ant_type = ANT_AC;
1669 else
1670 search_tbl->ant_type = ANT_BC;
1671
1672 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1673 break;
1674
1675 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1676 search_tbl, index);
1677 if (!ret)
1678 goto out;
1679 break;
1680 case IWL_SISO_SWITCH_GI:
1681 if (!tbl->is_ht40 && !(ht_cap->cap &
1682 IEEE80211_HT_CAP_SGI_20))
1683 break;
1684 if (tbl->is_ht40 && !(ht_cap->cap &
1685 IEEE80211_HT_CAP_SGI_40))
1686 break;
1687
1688 IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1689
1690 memcpy(search_tbl, tbl, sz);
1691 if (is_green) {
1692 if (!tbl->is_SGI)
1693 break;
1694 else
1695 IWL_ERR(priv,
1696 "SGI was set in GF+SISO\n");
1697 }
1698 search_tbl->is_SGI = !tbl->is_SGI;
1699 rs_set_expected_tpt_table(lq_sta, search_tbl);
1700 if (tbl->is_SGI) {
1701 s32 tpt = lq_sta->last_tpt / 100;
1702 if (tpt >= search_tbl->expected_tpt[index])
1703 break;
1704 }
1705 search_tbl->current_rate =
1706 rate_n_flags_from_tbl(priv, search_tbl,
1707 index, is_green);
1708 update_search_tbl_counter = 1;
1709 goto out;
1710 case IWL_SISO_SWITCH_MIMO3_ABC:
1711 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1712 memcpy(search_tbl, tbl, sz);
1713 search_tbl->is_SGI = 0;
1714 search_tbl->ant_type = ANT_ABC;
1715
1716 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1717 break;
1718
1719 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1720 search_tbl, index);
1721 if (!ret)
1722 goto out;
1723 break;
1724 }
1725 tbl->action++;
1726 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1727 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1728
1729 if (tbl->action == start_action)
1730 break;
1731 }
1732 search_tbl->lq_type = LQ_NONE;
1733 return;
1734
1735 out:
1736 lq_sta->search_better_tbl = 1;
1737 tbl->action++;
1738 if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1739 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1740 if (update_search_tbl_counter)
1741 search_tbl->action = tbl->action;
1742 }
1743
1744 /*
1745 * Try to switch to new modulation mode from MIMO2
1746 */
1747 static void rs_move_mimo2_to_other(struct iwl_priv *priv,
1748 struct iwl_lq_sta *lq_sta,
1749 struct ieee80211_conf *conf,
1750 struct ieee80211_sta *sta, int index)
1751 {
1752 s8 is_green = lq_sta->is_green;
1753 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1754 struct iwl_scale_tbl_info *search_tbl =
1755 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1756 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1757 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1758 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1759 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1760 u8 start_action;
1761 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1762 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1763 u8 update_search_tbl_counter = 0;
1764 int ret;
1765
1766 switch (priv->bt_traffic_load) {
1767 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1768 /* nothing */
1769 break;
1770 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1771 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1772 /* avoid antenna B and MIMO */
1773 if (tbl->action != IWL_MIMO2_SWITCH_SISO_A)
1774 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1775 break;
1776 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1777 /* avoid antenna B unless MIMO */
1778 if (tbl->action == IWL_MIMO2_SWITCH_SISO_B ||
1779 tbl->action == IWL_MIMO2_SWITCH_SISO_C)
1780 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1781 break;
1782 default:
1783 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load);
1784 break;
1785 }
1786
1787 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1788 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1789 tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1790 /* switch in SISO */
1791 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1792 }
1793
1794 /* configure as 1x1 if bt full concurrency */
1795 if (priv->bt_full_concurrent &&
1796 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1797 tbl->action > IWL_MIMO2_SWITCH_SISO_C))
1798 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1799
1800 start_action = tbl->action;
1801 for (;;) {
1802 lq_sta->action_counter++;
1803 switch (tbl->action) {
1804 case IWL_MIMO2_SWITCH_ANTENNA1:
1805 case IWL_MIMO2_SWITCH_ANTENNA2:
1806 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1807
1808 if (tx_chains_num <= 2)
1809 break;
1810
1811 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1812 break;
1813
1814 memcpy(search_tbl, tbl, sz);
1815 if (rs_toggle_antenna(valid_tx_ant,
1816 &search_tbl->current_rate, search_tbl)) {
1817 update_search_tbl_counter = 1;
1818 goto out;
1819 }
1820 break;
1821 case IWL_MIMO2_SWITCH_SISO_A:
1822 case IWL_MIMO2_SWITCH_SISO_B:
1823 case IWL_MIMO2_SWITCH_SISO_C:
1824 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1825
1826 /* Set up new search table for SISO */
1827 memcpy(search_tbl, tbl, sz);
1828
1829 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1830 search_tbl->ant_type = ANT_A;
1831 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1832 search_tbl->ant_type = ANT_B;
1833 else
1834 search_tbl->ant_type = ANT_C;
1835
1836 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1837 break;
1838
1839 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1840 search_tbl, index);
1841 if (!ret)
1842 goto out;
1843
1844 break;
1845
1846 case IWL_MIMO2_SWITCH_GI:
1847 if (!tbl->is_ht40 && !(ht_cap->cap &
1848 IEEE80211_HT_CAP_SGI_20))
1849 break;
1850 if (tbl->is_ht40 && !(ht_cap->cap &
1851 IEEE80211_HT_CAP_SGI_40))
1852 break;
1853
1854 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1855
1856 /* Set up new search table for MIMO2 */
1857 memcpy(search_tbl, tbl, sz);
1858 search_tbl->is_SGI = !tbl->is_SGI;
1859 rs_set_expected_tpt_table(lq_sta, search_tbl);
1860 /*
1861 * If active table already uses the fastest possible
1862 * modulation (dual stream with short guard interval),
1863 * and it's working well, there's no need to look
1864 * for a better type of modulation!
1865 */
1866 if (tbl->is_SGI) {
1867 s32 tpt = lq_sta->last_tpt / 100;
1868 if (tpt >= search_tbl->expected_tpt[index])
1869 break;
1870 }
1871 search_tbl->current_rate =
1872 rate_n_flags_from_tbl(priv, search_tbl,
1873 index, is_green);
1874 update_search_tbl_counter = 1;
1875 goto out;
1876
1877 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1878 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1879 memcpy(search_tbl, tbl, sz);
1880 search_tbl->is_SGI = 0;
1881 search_tbl->ant_type = ANT_ABC;
1882
1883 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1884 break;
1885
1886 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1887 search_tbl, index);
1888 if (!ret)
1889 goto out;
1890
1891 break;
1892 }
1893 tbl->action++;
1894 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1895 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1896
1897 if (tbl->action == start_action)
1898 break;
1899 }
1900 search_tbl->lq_type = LQ_NONE;
1901 return;
1902 out:
1903 lq_sta->search_better_tbl = 1;
1904 tbl->action++;
1905 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1906 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1907 if (update_search_tbl_counter)
1908 search_tbl->action = tbl->action;
1909
1910 }
1911
1912 /*
1913 * Try to switch to new modulation mode from MIMO3
1914 */
1915 static void rs_move_mimo3_to_other(struct iwl_priv *priv,
1916 struct iwl_lq_sta *lq_sta,
1917 struct ieee80211_conf *conf,
1918 struct ieee80211_sta *sta, int index)
1919 {
1920 s8 is_green = lq_sta->is_green;
1921 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1922 struct iwl_scale_tbl_info *search_tbl =
1923 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1924 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1925 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1926 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1927 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1928 u8 start_action;
1929 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1930 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1931 int ret;
1932 u8 update_search_tbl_counter = 0;
1933
1934 switch (priv->bt_traffic_load) {
1935 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1936 /* nothing */
1937 break;
1938 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1939 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1940 /* avoid antenna B and MIMO */
1941 if (tbl->action != IWL_MIMO3_SWITCH_SISO_A)
1942 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1943 break;
1944 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1945 /* avoid antenna B unless MIMO */
1946 if (tbl->action == IWL_MIMO3_SWITCH_SISO_B ||
1947 tbl->action == IWL_MIMO3_SWITCH_SISO_C)
1948 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1949 break;
1950 default:
1951 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load);
1952 break;
1953 }
1954
1955 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1956 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1957 tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1958 /* switch in SISO */
1959 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1960 }
1961
1962 /* configure as 1x1 if bt full concurrency */
1963 if (priv->bt_full_concurrent &&
1964 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1965 tbl->action > IWL_MIMO3_SWITCH_SISO_C))
1966 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1967
1968 start_action = tbl->action;
1969 for (;;) {
1970 lq_sta->action_counter++;
1971 switch (tbl->action) {
1972 case IWL_MIMO3_SWITCH_ANTENNA1:
1973 case IWL_MIMO3_SWITCH_ANTENNA2:
1974 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
1975
1976 if (tx_chains_num <= 3)
1977 break;
1978
1979 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1980 break;
1981
1982 memcpy(search_tbl, tbl, sz);
1983 if (rs_toggle_antenna(valid_tx_ant,
1984 &search_tbl->current_rate, search_tbl))
1985 goto out;
1986 break;
1987 case IWL_MIMO3_SWITCH_SISO_A:
1988 case IWL_MIMO3_SWITCH_SISO_B:
1989 case IWL_MIMO3_SWITCH_SISO_C:
1990 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
1991
1992 /* Set up new search table for SISO */
1993 memcpy(search_tbl, tbl, sz);
1994
1995 if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
1996 search_tbl->ant_type = ANT_A;
1997 else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
1998 search_tbl->ant_type = ANT_B;
1999 else
2000 search_tbl->ant_type = ANT_C;
2001
2002 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2003 break;
2004
2005 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
2006 search_tbl, index);
2007 if (!ret)
2008 goto out;
2009
2010 break;
2011
2012 case IWL_MIMO3_SWITCH_MIMO2_AB:
2013 case IWL_MIMO3_SWITCH_MIMO2_AC:
2014 case IWL_MIMO3_SWITCH_MIMO2_BC:
2015 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
2016
2017 memcpy(search_tbl, tbl, sz);
2018 search_tbl->is_SGI = 0;
2019 if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
2020 search_tbl->ant_type = ANT_AB;
2021 else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
2022 search_tbl->ant_type = ANT_AC;
2023 else
2024 search_tbl->ant_type = ANT_BC;
2025
2026 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2027 break;
2028
2029 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
2030 search_tbl, index);
2031 if (!ret)
2032 goto out;
2033
2034 break;
2035
2036 case IWL_MIMO3_SWITCH_GI:
2037 if (!tbl->is_ht40 && !(ht_cap->cap &
2038 IEEE80211_HT_CAP_SGI_20))
2039 break;
2040 if (tbl->is_ht40 && !(ht_cap->cap &
2041 IEEE80211_HT_CAP_SGI_40))
2042 break;
2043
2044 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
2045
2046 /* Set up new search table for MIMO */
2047 memcpy(search_tbl, tbl, sz);
2048 search_tbl->is_SGI = !tbl->is_SGI;
2049 rs_set_expected_tpt_table(lq_sta, search_tbl);
2050 /*
2051 * If active table already uses the fastest possible
2052 * modulation (dual stream with short guard interval),
2053 * and it's working well, there's no need to look
2054 * for a better type of modulation!
2055 */
2056 if (tbl->is_SGI) {
2057 s32 tpt = lq_sta->last_tpt / 100;
2058 if (tpt >= search_tbl->expected_tpt[index])
2059 break;
2060 }
2061 search_tbl->current_rate =
2062 rate_n_flags_from_tbl(priv, search_tbl,
2063 index, is_green);
2064 update_search_tbl_counter = 1;
2065 goto out;
2066 }
2067 tbl->action++;
2068 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2069 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2070
2071 if (tbl->action == start_action)
2072 break;
2073 }
2074 search_tbl->lq_type = LQ_NONE;
2075 return;
2076 out:
2077 lq_sta->search_better_tbl = 1;
2078 tbl->action++;
2079 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2080 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2081 if (update_search_tbl_counter)
2082 search_tbl->action = tbl->action;
2083 }
2084
2085 /*
2086 * Check whether we should continue using same modulation mode, or
2087 * begin search for a new mode, based on:
2088 * 1) # tx successes or failures while using this mode
2089 * 2) # times calling this function
2090 * 3) elapsed time in this mode (not used, for now)
2091 */
2092 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
2093 {
2094 struct iwl_scale_tbl_info *tbl;
2095 int i;
2096 int active_tbl;
2097 int flush_interval_passed = 0;
2098 struct iwl_priv *priv;
2099
2100 priv = lq_sta->drv;
2101 active_tbl = lq_sta->active_tbl;
2102
2103 tbl = &(lq_sta->lq_info[active_tbl]);
2104
2105 /* If we've been disallowing search, see if we should now allow it */
2106 if (lq_sta->stay_in_tbl) {
2107
2108 /* Elapsed time using current modulation mode */
2109 if (lq_sta->flush_timer)
2110 flush_interval_passed =
2111 time_after(jiffies,
2112 (unsigned long)(lq_sta->flush_timer +
2113 IWL_RATE_SCALE_FLUSH_INTVL));
2114
2115 /*
2116 * Check if we should allow search for new modulation mode.
2117 * If many frames have failed or succeeded, or we've used
2118 * this same modulation for a long time, allow search, and
2119 * reset history stats that keep track of whether we should
2120 * allow a new search. Also (below) reset all bitmaps and
2121 * stats in active history.
2122 */
2123 if (force_search ||
2124 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
2125 (lq_sta->total_success > lq_sta->max_success_limit) ||
2126 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
2127 && (flush_interval_passed))) {
2128 IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n",
2129 lq_sta->total_failed,
2130 lq_sta->total_success,
2131 flush_interval_passed);
2132
2133 /* Allow search for new mode */
2134 lq_sta->stay_in_tbl = 0; /* only place reset */
2135 lq_sta->total_failed = 0;
2136 lq_sta->total_success = 0;
2137 lq_sta->flush_timer = 0;
2138
2139 /*
2140 * Else if we've used this modulation mode enough repetitions
2141 * (regardless of elapsed time or success/failure), reset
2142 * history bitmaps and rate-specific stats for all rates in
2143 * active table.
2144 */
2145 } else {
2146 lq_sta->table_count++;
2147 if (lq_sta->table_count >=
2148 lq_sta->table_count_limit) {
2149 lq_sta->table_count = 0;
2150
2151 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
2152 for (i = 0; i < IWL_RATE_COUNT; i++)
2153 rs_rate_scale_clear_window(
2154 &(tbl->win[i]));
2155 }
2156 }
2157
2158 /* If transitioning to allow "search", reset all history
2159 * bitmaps and stats in active table (this will become the new
2160 * "search" table). */
2161 if (!lq_sta->stay_in_tbl) {
2162 for (i = 0; i < IWL_RATE_COUNT; i++)
2163 rs_rate_scale_clear_window(&(tbl->win[i]));
2164 }
2165 }
2166 }
2167
2168 /*
2169 * setup rate table in uCode
2170 */
2171 static void rs_update_rate_tbl(struct iwl_priv *priv,
2172 struct iwl_rxon_context *ctx,
2173 struct iwl_lq_sta *lq_sta,
2174 struct iwl_scale_tbl_info *tbl,
2175 int index, u8 is_green)
2176 {
2177 u32 rate;
2178
2179 /* Update uCode's rate table. */
2180 rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2181 rs_fill_link_cmd(priv, lq_sta, rate);
2182 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2183 }
2184
2185 /*
2186 * Do rate scaling and search for new modulation mode.
2187 */
2188 static void rs_rate_scale_perform(struct iwl_priv *priv,
2189 struct sk_buff *skb,
2190 struct ieee80211_sta *sta,
2191 struct iwl_lq_sta *lq_sta)
2192 {
2193 struct ieee80211_hw *hw = priv->hw;
2194 struct ieee80211_conf *conf = &hw->conf;
2195 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2196 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2197 int low = IWL_RATE_INVALID;
2198 int high = IWL_RATE_INVALID;
2199 int index;
2200 int i;
2201 struct iwl_rate_scale_data *window = NULL;
2202 int current_tpt = IWL_INVALID_VALUE;
2203 int low_tpt = IWL_INVALID_VALUE;
2204 int high_tpt = IWL_INVALID_VALUE;
2205 u32 fail_count;
2206 s8 scale_action = 0;
2207 u16 rate_mask;
2208 u8 update_lq = 0;
2209 struct iwl_scale_tbl_info *tbl, *tbl1;
2210 u16 rate_scale_index_msk = 0;
2211 u8 is_green = 0;
2212 u8 active_tbl = 0;
2213 u8 done_search = 0;
2214 u16 high_low;
2215 s32 sr;
2216 u8 tid = IWL_MAX_TID_COUNT;
2217 struct iwl_tid_data *tid_data;
2218 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
2219 struct iwl_rxon_context *ctx = sta_priv->ctx;
2220
2221 IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
2222
2223 /* Send management frames and NO_ACK data using lowest rate. */
2224 /* TODO: this could probably be improved.. */
2225 if (!ieee80211_is_data(hdr->frame_control) ||
2226 info->flags & IEEE80211_TX_CTL_NO_ACK)
2227 return;
2228
2229 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
2230
2231 tid = rs_tl_add_packet(lq_sta, hdr);
2232 if ((tid != IWL_MAX_TID_COUNT) &&
2233 (lq_sta->tx_agg_tid_en & (1 << tid))) {
2234 tid_data = &priv->tid_data[lq_sta->lq.sta_id][tid];
2235 if (tid_data->agg.state == IWL_AGG_OFF)
2236 lq_sta->is_agg = 0;
2237 else
2238 lq_sta->is_agg = 1;
2239 } else
2240 lq_sta->is_agg = 0;
2241
2242 /*
2243 * Select rate-scale / modulation-mode table to work with in
2244 * the rest of this function: "search" if searching for better
2245 * modulation mode, or "active" if doing rate scaling within a mode.
2246 */
2247 if (!lq_sta->search_better_tbl)
2248 active_tbl = lq_sta->active_tbl;
2249 else
2250 active_tbl = 1 - lq_sta->active_tbl;
2251
2252 tbl = &(lq_sta->lq_info[active_tbl]);
2253 if (is_legacy(tbl->lq_type))
2254 lq_sta->is_green = 0;
2255 else
2256 lq_sta->is_green = rs_use_green(sta);
2257 is_green = lq_sta->is_green;
2258
2259 /* current tx rate */
2260 index = lq_sta->last_txrate_idx;
2261
2262 IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2263 tbl->lq_type);
2264
2265 /* rates available for this association, and for modulation mode */
2266 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2267
2268 IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
2269
2270 /* mask with station rate restriction */
2271 if (is_legacy(tbl->lq_type)) {
2272 if (lq_sta->band == NL80211_BAND_5GHZ)
2273 /* supp_rates has no CCK bits in A mode */
2274 rate_scale_index_msk = (u16) (rate_mask &
2275 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2276 else
2277 rate_scale_index_msk = (u16) (rate_mask &
2278 lq_sta->supp_rates);
2279
2280 } else
2281 rate_scale_index_msk = rate_mask;
2282
2283 if (!rate_scale_index_msk)
2284 rate_scale_index_msk = rate_mask;
2285
2286 if (!((1 << index) & rate_scale_index_msk)) {
2287 IWL_ERR(priv, "Current Rate is not valid\n");
2288 if (lq_sta->search_better_tbl) {
2289 /* revert to active table if search table is not valid*/
2290 tbl->lq_type = LQ_NONE;
2291 lq_sta->search_better_tbl = 0;
2292 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2293 /* get "active" rate info */
2294 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2295 rs_update_rate_tbl(priv, ctx, lq_sta, tbl,
2296 index, is_green);
2297 }
2298 return;
2299 }
2300
2301 /* Get expected throughput table and history window for current rate */
2302 if (!tbl->expected_tpt) {
2303 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2304 return;
2305 }
2306
2307 /* force user max rate if set by user */
2308 if ((lq_sta->max_rate_idx != -1) &&
2309 (lq_sta->max_rate_idx < index)) {
2310 index = lq_sta->max_rate_idx;
2311 update_lq = 1;
2312 window = &(tbl->win[index]);
2313 goto lq_update;
2314 }
2315
2316 window = &(tbl->win[index]);
2317
2318 /*
2319 * If there is not enough history to calculate actual average
2320 * throughput, keep analyzing results of more tx frames, without
2321 * changing rate or mode (bypass most of the rest of this function).
2322 * Set up new rate table in uCode only if old rate is not supported
2323 * in current association (use new rate found above).
2324 */
2325 fail_count = window->counter - window->success_counter;
2326 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2327 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2328 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2329 "for index %d\n",
2330 window->success_counter, window->counter, index);
2331
2332 /* Can't calculate this yet; not enough history */
2333 window->average_tpt = IWL_INVALID_VALUE;
2334
2335 /* Should we stay with this modulation mode,
2336 * or search for a new one? */
2337 rs_stay_in_table(lq_sta, false);
2338
2339 goto out;
2340 }
2341 /* Else we have enough samples; calculate estimate of
2342 * actual average throughput */
2343 if (window->average_tpt != ((window->success_ratio *
2344 tbl->expected_tpt[index] + 64) / 128)) {
2345 IWL_ERR(priv, "expected_tpt should have been calculated by now\n");
2346 window->average_tpt = ((window->success_ratio *
2347 tbl->expected_tpt[index] + 64) / 128);
2348 }
2349
2350 /* If we are searching for better modulation mode, check success. */
2351 if (lq_sta->search_better_tbl &&
2352 (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
2353 /* If good success, continue using the "search" mode;
2354 * no need to send new link quality command, since we're
2355 * continuing to use the setup that we've been trying. */
2356 if (window->average_tpt > lq_sta->last_tpt) {
2357
2358 IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2359 "suc=%d cur-tpt=%d old-tpt=%d\n",
2360 window->success_ratio,
2361 window->average_tpt,
2362 lq_sta->last_tpt);
2363
2364 if (!is_legacy(tbl->lq_type))
2365 lq_sta->enable_counter = 1;
2366
2367 /* Swap tables; "search" becomes "active" */
2368 lq_sta->active_tbl = active_tbl;
2369 current_tpt = window->average_tpt;
2370
2371 /* Else poor success; go back to mode in "active" table */
2372 } else {
2373
2374 IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2375 "suc=%d cur-tpt=%d old-tpt=%d\n",
2376 window->success_ratio,
2377 window->average_tpt,
2378 lq_sta->last_tpt);
2379
2380 /* Nullify "search" table */
2381 tbl->lq_type = LQ_NONE;
2382
2383 /* Revert to "active" table */
2384 active_tbl = lq_sta->active_tbl;
2385 tbl = &(lq_sta->lq_info[active_tbl]);
2386
2387 /* Revert to "active" rate and throughput info */
2388 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2389 current_tpt = lq_sta->last_tpt;
2390
2391 /* Need to set up a new rate table in uCode */
2392 update_lq = 1;
2393 }
2394
2395 /* Either way, we've made a decision; modulation mode
2396 * search is done, allow rate adjustment next time. */
2397 lq_sta->search_better_tbl = 0;
2398 done_search = 1; /* Don't switch modes below! */
2399 goto lq_update;
2400 }
2401
2402 /* (Else) not in search of better modulation mode, try for better
2403 * starting rate, while staying in this mode. */
2404 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2405 tbl->lq_type);
2406 low = high_low & 0xff;
2407 high = (high_low >> 8) & 0xff;
2408
2409 /* If user set max rate, dont allow higher than user constrain */
2410 if ((lq_sta->max_rate_idx != -1) &&
2411 (lq_sta->max_rate_idx < high))
2412 high = IWL_RATE_INVALID;
2413
2414 sr = window->success_ratio;
2415
2416 /* Collect measured throughputs for current and adjacent rates */
2417 current_tpt = window->average_tpt;
2418 if (low != IWL_RATE_INVALID)
2419 low_tpt = tbl->win[low].average_tpt;
2420 if (high != IWL_RATE_INVALID)
2421 high_tpt = tbl->win[high].average_tpt;
2422
2423 scale_action = 0;
2424
2425 /* Too many failures, decrease rate */
2426 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2427 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2428 scale_action = -1;
2429
2430 /* No throughput measured yet for adjacent rates; try increase. */
2431 } else if ((low_tpt == IWL_INVALID_VALUE) &&
2432 (high_tpt == IWL_INVALID_VALUE)) {
2433
2434 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2435 scale_action = 1;
2436 else if (low != IWL_RATE_INVALID)
2437 scale_action = 0;
2438 }
2439
2440 /* Both adjacent throughputs are measured, but neither one has better
2441 * throughput; we're using the best rate, don't change it! */
2442 else if ((low_tpt != IWL_INVALID_VALUE) &&
2443 (high_tpt != IWL_INVALID_VALUE) &&
2444 (low_tpt < current_tpt) &&
2445 (high_tpt < current_tpt))
2446 scale_action = 0;
2447
2448 /* At least one adjacent rate's throughput is measured,
2449 * and may have better performance. */
2450 else {
2451 /* Higher adjacent rate's throughput is measured */
2452 if (high_tpt != IWL_INVALID_VALUE) {
2453 /* Higher rate has better throughput */
2454 if (high_tpt > current_tpt &&
2455 sr >= IWL_RATE_INCREASE_TH) {
2456 scale_action = 1;
2457 } else {
2458 scale_action = 0;
2459 }
2460
2461 /* Lower adjacent rate's throughput is measured */
2462 } else if (low_tpt != IWL_INVALID_VALUE) {
2463 /* Lower rate has better throughput */
2464 if (low_tpt > current_tpt) {
2465 IWL_DEBUG_RATE(priv,
2466 "decrease rate because of low tpt\n");
2467 scale_action = -1;
2468 } else if (sr >= IWL_RATE_INCREASE_TH) {
2469 scale_action = 1;
2470 }
2471 }
2472 }
2473
2474 /* Sanity check; asked for decrease, but success rate or throughput
2475 * has been good at old rate. Don't change it. */
2476 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2477 ((sr > IWL_RATE_HIGH_TH) ||
2478 (current_tpt > (100 * tbl->expected_tpt[low]))))
2479 scale_action = 0;
2480 if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2481 scale_action = -1;
2482 if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
2483 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2484 scale_action = -1;
2485
2486 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2487 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2488 if (lq_sta->last_bt_traffic > priv->bt_traffic_load) {
2489 /*
2490 * don't set scale_action, don't want to scale up if
2491 * the rate scale doesn't otherwise think that is a
2492 * good idea.
2493 */
2494 } else if (lq_sta->last_bt_traffic <= priv->bt_traffic_load) {
2495 scale_action = -1;
2496 }
2497 }
2498 lq_sta->last_bt_traffic = priv->bt_traffic_load;
2499
2500 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2501 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2502 /* search for a new modulation */
2503 rs_stay_in_table(lq_sta, true);
2504 goto lq_update;
2505 }
2506
2507 switch (scale_action) {
2508 case -1:
2509 /* Decrease starting rate, update uCode's rate table */
2510 if (low != IWL_RATE_INVALID) {
2511 update_lq = 1;
2512 index = low;
2513 }
2514
2515 break;
2516 case 1:
2517 /* Increase starting rate, update uCode's rate table */
2518 if (high != IWL_RATE_INVALID) {
2519 update_lq = 1;
2520 index = high;
2521 }
2522
2523 break;
2524 case 0:
2525 /* No change */
2526 default:
2527 break;
2528 }
2529
2530 IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2531 "high %d type %d\n",
2532 index, scale_action, low, high, tbl->lq_type);
2533
2534 lq_update:
2535 /* Replace uCode's rate table for the destination station. */
2536 if (update_lq)
2537 rs_update_rate_tbl(priv, ctx, lq_sta, tbl, index, is_green);
2538
2539 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
2540 /* Should we stay with this modulation mode,
2541 * or search for a new one? */
2542 rs_stay_in_table(lq_sta, false);
2543 }
2544 /*
2545 * Search for new modulation mode if we're:
2546 * 1) Not changing rates right now
2547 * 2) Not just finishing up a search
2548 * 3) Allowing a new search
2549 */
2550 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2551 /* Save current throughput to compare with "search" throughput*/
2552 lq_sta->last_tpt = current_tpt;
2553
2554 /* Select a new "search" modulation mode to try.
2555 * If one is found, set up the new "search" table. */
2556 if (is_legacy(tbl->lq_type))
2557 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2558 else if (is_siso(tbl->lq_type))
2559 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2560 else if (is_mimo2(tbl->lq_type))
2561 rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2562 else
2563 rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2564
2565 /* If new "search" mode was selected, set up in uCode table */
2566 if (lq_sta->search_better_tbl) {
2567 /* Access the "search" table, clear its history. */
2568 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2569 for (i = 0; i < IWL_RATE_COUNT; i++)
2570 rs_rate_scale_clear_window(&(tbl->win[i]));
2571
2572 /* Use new "search" start rate */
2573 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2574
2575 IWL_DEBUG_RATE(priv, "Switch current mcs: %X index: %d\n",
2576 tbl->current_rate, index);
2577 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2578 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2579 } else
2580 done_search = 1;
2581 }
2582
2583 if (done_search && !lq_sta->stay_in_tbl) {
2584 /* If the "active" (non-search) mode was legacy,
2585 * and we've tried switching antennas,
2586 * but we haven't been able to try HT modes (not available),
2587 * stay with best antenna legacy modulation for a while
2588 * before next round of mode comparisons. */
2589 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2590 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2591 lq_sta->action_counter > tbl1->max_search) {
2592 IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2593 rs_set_stay_in_table(priv, 1, lq_sta);
2594 }
2595
2596 /* If we're in an HT mode, and all 3 mode switch actions
2597 * have been tried and compared, stay in this best modulation
2598 * mode for a while before next round of mode comparisons. */
2599 if (lq_sta->enable_counter &&
2600 (lq_sta->action_counter >= tbl1->max_search) &&
2601 iwl_ht_enabled(priv)) {
2602 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2603 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2604 (tid != IWL_MAX_TID_COUNT)) {
2605 u8 sta_id = lq_sta->lq.sta_id;
2606 tid_data = &priv->tid_data[sta_id][tid];
2607 if (tid_data->agg.state == IWL_AGG_OFF) {
2608 IWL_DEBUG_RATE(priv,
2609 "try to aggregate tid %d\n",
2610 tid);
2611 rs_tl_turn_on_agg(priv, tid,
2612 lq_sta, sta);
2613 }
2614 }
2615 rs_set_stay_in_table(priv, 0, lq_sta);
2616 }
2617 }
2618
2619 out:
2620 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2621 lq_sta->last_txrate_idx = index;
2622 }
2623
2624 /**
2625 * rs_initialize_lq - Initialize a station's hardware rate table
2626 *
2627 * The uCode's station table contains a table of fallback rates
2628 * for automatic fallback during transmission.
2629 *
2630 * NOTE: This sets up a default set of values. These will be replaced later
2631 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2632 * rc80211_simple.
2633 *
2634 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2635 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2636 * which requires station table entry to exist).
2637 */
2638 static void rs_initialize_lq(struct iwl_priv *priv,
2639 struct ieee80211_sta *sta,
2640 struct iwl_lq_sta *lq_sta)
2641 {
2642 struct iwl_scale_tbl_info *tbl;
2643 int rate_idx;
2644 int i;
2645 u32 rate;
2646 u8 use_green = rs_use_green(sta);
2647 u8 active_tbl = 0;
2648 u8 valid_tx_ant;
2649 struct iwl_station_priv *sta_priv;
2650 struct iwl_rxon_context *ctx;
2651
2652 if (!sta || !lq_sta)
2653 return;
2654
2655 sta_priv = (void *)sta->drv_priv;
2656 ctx = sta_priv->ctx;
2657
2658 i = lq_sta->last_txrate_idx;
2659
2660 valid_tx_ant = priv->nvm_data->valid_tx_ant;
2661
2662 if (!lq_sta->search_better_tbl)
2663 active_tbl = lq_sta->active_tbl;
2664 else
2665 active_tbl = 1 - lq_sta->active_tbl;
2666
2667 tbl = &(lq_sta->lq_info[active_tbl]);
2668
2669 if ((i < 0) || (i >= IWL_RATE_COUNT))
2670 i = 0;
2671
2672 rate = iwl_rates[i].plcp;
2673 tbl->ant_type = first_antenna(valid_tx_ant);
2674 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2675
2676 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2677 rate |= RATE_MCS_CCK_MSK;
2678
2679 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2680 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2681 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2682
2683 rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2684 tbl->current_rate = rate;
2685 rs_set_expected_tpt_table(lq_sta, tbl);
2686 rs_fill_link_cmd(NULL, lq_sta, rate);
2687 priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2688 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, 0, true);
2689 }
2690
2691 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2692 struct ieee80211_tx_rate_control *txrc)
2693 {
2694
2695 struct sk_buff *skb = txrc->skb;
2696 struct ieee80211_supported_band *sband = txrc->sband;
2697 struct iwl_op_mode *op_mode __maybe_unused =
2698 (struct iwl_op_mode *)priv_r;
2699 struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
2700 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2701 struct iwl_lq_sta *lq_sta = priv_sta;
2702 int rate_idx;
2703
2704 IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2705
2706 /* Get max rate if user set max rate */
2707 if (lq_sta) {
2708 lq_sta->max_rate_idx = fls(txrc->rate_idx_mask) - 1;
2709 if ((sband->band == NL80211_BAND_5GHZ) &&
2710 (lq_sta->max_rate_idx != -1))
2711 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2712 if ((lq_sta->max_rate_idx < 0) ||
2713 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2714 lq_sta->max_rate_idx = -1;
2715 }
2716
2717 /* Treat uninitialized rate scaling data same as non-existing. */
2718 if (lq_sta && !lq_sta->drv) {
2719 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
2720 priv_sta = NULL;
2721 }
2722
2723 rate_idx = lq_sta->last_txrate_idx;
2724
2725 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2726 rate_idx -= IWL_FIRST_OFDM_RATE;
2727 /* 6M and 9M shared same MCS index */
2728 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2729 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2730 IWL_RATE_MIMO3_6M_PLCP)
2731 rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2732 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2733 IWL_RATE_MIMO2_6M_PLCP)
2734 rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2735 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2736 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2737 info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2738 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2739 info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
2740 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2741 info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2742 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2743 info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2744 } else {
2745 /* Check for invalid rates */
2746 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2747 ((sband->band == NL80211_BAND_5GHZ) &&
2748 (rate_idx < IWL_FIRST_OFDM_RATE)))
2749 rate_idx = rate_lowest_index(sband, sta);
2750 /* On valid 5 GHz rate, adjust index */
2751 else if (sband->band == NL80211_BAND_5GHZ)
2752 rate_idx -= IWL_FIRST_OFDM_RATE;
2753 info->control.rates[0].flags = 0;
2754 }
2755 info->control.rates[0].idx = rate_idx;
2756 info->control.rates[0].count = 1;
2757 }
2758
2759 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2760 gfp_t gfp)
2761 {
2762 struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2763 struct iwl_op_mode *op_mode __maybe_unused =
2764 (struct iwl_op_mode *)priv_rate;
2765 struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
2766
2767 IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2768
2769 return &sta_priv->lq_sta;
2770 }
2771
2772 /*
2773 * Called after adding a new station to initialize rate scaling
2774 */
2775 void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id)
2776 {
2777 int i, j;
2778 struct ieee80211_hw *hw = priv->hw;
2779 struct ieee80211_conf *conf = &priv->hw->conf;
2780 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2781 struct iwl_station_priv *sta_priv;
2782 struct iwl_lq_sta *lq_sta;
2783 struct ieee80211_supported_band *sband;
2784 unsigned long supp; /* must be unsigned long for for_each_set_bit */
2785
2786 sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2787 lq_sta = &sta_priv->lq_sta;
2788 sband = hw->wiphy->bands[conf->chandef.chan->band];
2789
2790
2791 lq_sta->lq.sta_id = sta_id;
2792
2793 for (j = 0; j < LQ_SIZE; j++)
2794 for (i = 0; i < IWL_RATE_COUNT; i++)
2795 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2796
2797 lq_sta->flush_timer = 0;
2798 lq_sta->supp_rates = sta->supp_rates[sband->band];
2799
2800 IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n",
2801 sta_id);
2802 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2803 * the lowest or the highest rate.. Could consider using RSSI from
2804 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2805 * after assoc.. */
2806
2807 lq_sta->is_dup = 0;
2808 lq_sta->max_rate_idx = -1;
2809 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2810 lq_sta->is_green = rs_use_green(sta);
2811 lq_sta->band = sband->band;
2812 /*
2813 * active legacy rates as per supported rates bitmap
2814 */
2815 supp = sta->supp_rates[sband->band];
2816 lq_sta->active_legacy_rate = 0;
2817 for_each_set_bit(i, &supp, BITS_PER_LONG)
2818 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2819
2820 /*
2821 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2822 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2823 */
2824 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2825 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2826 lq_sta->active_siso_rate &= ~((u16)0x2);
2827 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2828
2829 /* Same here */
2830 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2831 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2832 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2833 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2834
2835 lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2836 lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2837 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2838 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2839
2840 IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2841 lq_sta->active_siso_rate,
2842 lq_sta->active_mimo2_rate,
2843 lq_sta->active_mimo3_rate);
2844
2845 /* These values will be overridden later */
2846 lq_sta->lq.general_params.single_stream_ant_msk =
2847 first_antenna(priv->nvm_data->valid_tx_ant);
2848 lq_sta->lq.general_params.dual_stream_ant_msk =
2849 priv->nvm_data->valid_tx_ant &
2850 ~first_antenna(priv->nvm_data->valid_tx_ant);
2851 if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2852 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2853 } else if (num_of_ant(priv->nvm_data->valid_tx_ant) == 2) {
2854 lq_sta->lq.general_params.dual_stream_ant_msk =
2855 priv->nvm_data->valid_tx_ant;
2856 }
2857
2858 /* as default allow aggregation for all tids */
2859 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2860 lq_sta->drv = priv;
2861
2862 /* Set last_txrate_idx to lowest rate */
2863 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2864 if (sband->band == NL80211_BAND_5GHZ)
2865 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2866 lq_sta->is_agg = 0;
2867 #ifdef CONFIG_MAC80211_DEBUGFS
2868 lq_sta->dbg_fixed_rate = 0;
2869 #endif
2870
2871 rs_initialize_lq(priv, sta, lq_sta);
2872 }
2873
2874 static void rs_fill_link_cmd(struct iwl_priv *priv,
2875 struct iwl_lq_sta *lq_sta, u32 new_rate)
2876 {
2877 struct iwl_scale_tbl_info tbl_type;
2878 int index = 0;
2879 int rate_idx;
2880 int repeat_rate = 0;
2881 u8 ant_toggle_cnt = 0;
2882 u8 use_ht_possible = 1;
2883 u8 valid_tx_ant = 0;
2884 struct iwl_station_priv *sta_priv =
2885 container_of(lq_sta, struct iwl_station_priv, lq_sta);
2886 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2887
2888 /* Override starting rate (index 0) if needed for debug purposes */
2889 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2890
2891 /* Interpret new_rate (rate_n_flags) */
2892 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2893 &tbl_type, &rate_idx);
2894
2895 if (priv && priv->bt_full_concurrent) {
2896 /* 1x1 only */
2897 tbl_type.ant_type =
2898 first_antenna(priv->nvm_data->valid_tx_ant);
2899 }
2900
2901 /* How many times should we repeat the initial rate? */
2902 if (is_legacy(tbl_type.lq_type)) {
2903 ant_toggle_cnt = 1;
2904 repeat_rate = IWL_NUMBER_TRY;
2905 } else {
2906 repeat_rate = min(IWL_HT_NUMBER_TRY,
2907 LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2908 }
2909
2910 lq_cmd->general_params.mimo_delimiter =
2911 is_mimo(tbl_type.lq_type) ? 1 : 0;
2912
2913 /* Fill 1st table entry (index 0) */
2914 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2915
2916 if (num_of_ant(tbl_type.ant_type) == 1) {
2917 lq_cmd->general_params.single_stream_ant_msk =
2918 tbl_type.ant_type;
2919 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2920 lq_cmd->general_params.dual_stream_ant_msk =
2921 tbl_type.ant_type;
2922 } /* otherwise we don't modify the existing value */
2923
2924 index++;
2925 repeat_rate--;
2926 if (priv) {
2927 if (priv->bt_full_concurrent)
2928 valid_tx_ant = ANT_A;
2929 else
2930 valid_tx_ant = priv->nvm_data->valid_tx_ant;
2931 }
2932
2933 /* Fill rest of rate table */
2934 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2935 /* Repeat initial/next rate.
2936 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2937 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2938 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2939 if (is_legacy(tbl_type.lq_type)) {
2940 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2941 ant_toggle_cnt++;
2942 else if (priv &&
2943 rs_toggle_antenna(valid_tx_ant,
2944 &new_rate, &tbl_type))
2945 ant_toggle_cnt = 1;
2946 }
2947
2948 /* Override next rate if needed for debug purposes */
2949 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2950
2951 /* Fill next table entry */
2952 lq_cmd->rs_table[index].rate_n_flags =
2953 cpu_to_le32(new_rate);
2954 repeat_rate--;
2955 index++;
2956 }
2957
2958 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2959 &rate_idx);
2960
2961 if (priv && priv->bt_full_concurrent) {
2962 /* 1x1 only */
2963 tbl_type.ant_type =
2964 first_antenna(priv->nvm_data->valid_tx_ant);
2965 }
2966
2967 /* Indicate to uCode which entries might be MIMO.
2968 * If initial rate was MIMO, this will finally end up
2969 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2970 if (is_mimo(tbl_type.lq_type))
2971 lq_cmd->general_params.mimo_delimiter = index;
2972
2973 /* Get next rate */
2974 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2975 use_ht_possible);
2976
2977 /* How many times should we repeat the next rate? */
2978 if (is_legacy(tbl_type.lq_type)) {
2979 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2980 ant_toggle_cnt++;
2981 else if (priv &&
2982 rs_toggle_antenna(valid_tx_ant,
2983 &new_rate, &tbl_type))
2984 ant_toggle_cnt = 1;
2985
2986 repeat_rate = IWL_NUMBER_TRY;
2987 } else {
2988 repeat_rate = IWL_HT_NUMBER_TRY;
2989 }
2990
2991 /* Don't allow HT rates after next pass.
2992 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2993 use_ht_possible = 0;
2994
2995 /* Override next rate if needed for debug purposes */
2996 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2997
2998 /* Fill next table entry */
2999 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
3000
3001 index++;
3002 repeat_rate--;
3003 }
3004
3005 lq_cmd->agg_params.agg_frame_cnt_limit =
3006 sta_priv->max_agg_bufsize ?: LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3007 lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
3008
3009 lq_cmd->agg_params.agg_time_limit =
3010 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
3011 /*
3012 * overwrite if needed, pass aggregation time limit
3013 * to uCode in uSec
3014 */
3015 if (priv && priv->lib->bt_params &&
3016 priv->lib->bt_params->agg_time_limit &&
3017 priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH)
3018 lq_cmd->agg_params.agg_time_limit =
3019 cpu_to_le16(priv->lib->bt_params->agg_time_limit);
3020 }
3021
3022 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3023 {
3024 return hw->priv;
3025 }
3026 /* rate scale requires free function to be implemented */
3027 static void rs_free(void *priv_rate)
3028 {
3029 return;
3030 }
3031
3032 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
3033 void *priv_sta)
3034 {
3035 struct iwl_op_mode *op_mode __maybe_unused = priv_r;
3036 struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
3037
3038 IWL_DEBUG_RATE(priv, "enter\n");
3039 IWL_DEBUG_RATE(priv, "leave\n");
3040 }
3041
3042 #ifdef CONFIG_MAC80211_DEBUGFS
3043 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
3044 u32 *rate_n_flags, int index)
3045 {
3046 struct iwl_priv *priv;
3047 u8 valid_tx_ant;
3048 u8 ant_sel_tx;
3049
3050 priv = lq_sta->drv;
3051 valid_tx_ant = priv->nvm_data->valid_tx_ant;
3052 if (lq_sta->dbg_fixed_rate) {
3053 ant_sel_tx =
3054 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
3055 >> RATE_MCS_ANT_POS);
3056 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
3057 *rate_n_flags = lq_sta->dbg_fixed_rate;
3058 IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
3059 } else {
3060 lq_sta->dbg_fixed_rate = 0;
3061 IWL_ERR(priv,
3062 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
3063 ant_sel_tx, valid_tx_ant);
3064 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3065 }
3066 } else {
3067 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3068 }
3069 }
3070
3071 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3072 const char __user *user_buf, size_t count, loff_t *ppos)
3073 {
3074 struct iwl_lq_sta *lq_sta = file->private_data;
3075 struct iwl_priv *priv;
3076 char buf[64];
3077 size_t buf_size;
3078 u32 parsed_rate;
3079
3080
3081 priv = lq_sta->drv;
3082 memset(buf, 0, sizeof(buf));
3083 buf_size = min(count, sizeof(buf) - 1);
3084 if (copy_from_user(buf, user_buf, buf_size))
3085 return -EFAULT;
3086
3087 if (sscanf(buf, "%x", &parsed_rate) == 1)
3088 lq_sta->dbg_fixed_rate = parsed_rate;
3089 else
3090 lq_sta->dbg_fixed_rate = 0;
3091
3092 rs_program_fix_rate(priv, lq_sta);
3093
3094 return count;
3095 }
3096
3097 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3098 char __user *user_buf, size_t count, loff_t *ppos)
3099 {
3100 char *buff;
3101 int desc = 0;
3102 int i = 0;
3103 int index = 0;
3104 ssize_t ret;
3105
3106 struct iwl_lq_sta *lq_sta = file->private_data;
3107 struct iwl_priv *priv;
3108 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3109
3110 priv = lq_sta->drv;
3111 buff = kmalloc(1024, GFP_KERNEL);
3112 if (!buff)
3113 return -ENOMEM;
3114
3115 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3116 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
3117 lq_sta->total_failed, lq_sta->total_success,
3118 lq_sta->active_legacy_rate);
3119 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3120 lq_sta->dbg_fixed_rate);
3121 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3122 (priv->nvm_data->valid_tx_ant & ANT_A) ? "ANT_A," : "",
3123 (priv->nvm_data->valid_tx_ant & ANT_B) ? "ANT_B," : "",
3124 (priv->nvm_data->valid_tx_ant & ANT_C) ? "ANT_C" : "");
3125 desc += sprintf(buff+desc, "lq type %s\n",
3126 (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
3127 if (is_Ht(tbl->lq_type)) {
3128 desc += sprintf(buff + desc, " %s",
3129 (is_siso(tbl->lq_type)) ? "SISO" :
3130 ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
3131 desc += sprintf(buff + desc, " %s",
3132 (tbl->is_ht40) ? "40MHz" : "20MHz");
3133 desc += sprintf(buff + desc, " %s %s %s\n",
3134 (tbl->is_SGI) ? "SGI" : "",
3135 (lq_sta->is_green) ? "GF enabled" : "",
3136 (lq_sta->is_agg) ? "AGG on" : "");
3137 }
3138 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3139 lq_sta->last_rate_n_flags);
3140 desc += sprintf(buff+desc, "general:"
3141 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
3142 lq_sta->lq.general_params.flags,
3143 lq_sta->lq.general_params.mimo_delimiter,
3144 lq_sta->lq.general_params.single_stream_ant_msk,
3145 lq_sta->lq.general_params.dual_stream_ant_msk);
3146
3147 desc += sprintf(buff+desc, "agg:"
3148 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3149 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
3150 lq_sta->lq.agg_params.agg_dis_start_th,
3151 lq_sta->lq.agg_params.agg_frame_cnt_limit);
3152
3153 desc += sprintf(buff+desc,
3154 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3155 lq_sta->lq.general_params.start_rate_index[0],
3156 lq_sta->lq.general_params.start_rate_index[1],
3157 lq_sta->lq.general_params.start_rate_index[2],
3158 lq_sta->lq.general_params.start_rate_index[3]);
3159
3160 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3161 index = iwl_hwrate_to_plcp_idx(
3162 le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
3163 if (is_legacy(tbl->lq_type)) {
3164 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
3165 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3166 iwl_rate_mcs[index].mbps);
3167 } else {
3168 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
3169 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3170 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
3171 }
3172 }
3173
3174 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3175 kfree(buff);
3176 return ret;
3177 }
3178
3179 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3180 .write = rs_sta_dbgfs_scale_table_write,
3181 .read = rs_sta_dbgfs_scale_table_read,
3182 .open = simple_open,
3183 .llseek = default_llseek,
3184 };
3185 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3186 char __user *user_buf, size_t count, loff_t *ppos)
3187 {
3188 char *buff;
3189 int desc = 0;
3190 int i, j;
3191 ssize_t ret;
3192
3193 struct iwl_lq_sta *lq_sta = file->private_data;
3194
3195 buff = kmalloc(1024, GFP_KERNEL);
3196 if (!buff)
3197 return -ENOMEM;
3198
3199 for (i = 0; i < LQ_SIZE; i++) {
3200 desc += sprintf(buff+desc,
3201 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
3202 "rate=0x%X\n",
3203 lq_sta->active_tbl == i ? "*" : "x",
3204 lq_sta->lq_info[i].lq_type,
3205 lq_sta->lq_info[i].is_SGI,
3206 lq_sta->lq_info[i].is_ht40,
3207 lq_sta->lq_info[i].is_dup,
3208 lq_sta->is_green,
3209 lq_sta->lq_info[i].current_rate);
3210 for (j = 0; j < IWL_RATE_COUNT; j++) {
3211 desc += sprintf(buff+desc,
3212 "counter=%d success=%d %%=%d\n",
3213 lq_sta->lq_info[i].win[j].counter,
3214 lq_sta->lq_info[i].win[j].success_counter,
3215 lq_sta->lq_info[i].win[j].success_ratio);
3216 }
3217 }
3218 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3219 kfree(buff);
3220 return ret;
3221 }
3222
3223 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3224 .read = rs_sta_dbgfs_stats_table_read,
3225 .open = simple_open,
3226 .llseek = default_llseek,
3227 };
3228
3229 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3230 char __user *user_buf, size_t count, loff_t *ppos)
3231 {
3232 struct iwl_lq_sta *lq_sta = file->private_data;
3233 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3234 char buff[120];
3235 int desc = 0;
3236
3237 if (is_Ht(tbl->lq_type))
3238 desc += sprintf(buff+desc,
3239 "Bit Rate= %d Mb/s\n",
3240 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3241 else
3242 desc += sprintf(buff+desc,
3243 "Bit Rate= %d Mb/s\n",
3244 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3245
3246 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3247 }
3248
3249 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3250 .read = rs_sta_dbgfs_rate_scale_data_read,
3251 .open = simple_open,
3252 .llseek = default_llseek,
3253 };
3254
3255 static void rs_add_debugfs(void *priv, void *priv_sta,
3256 struct dentry *dir)
3257 {
3258 struct iwl_lq_sta *lq_sta = priv_sta;
3259
3260 debugfs_create_file("rate_scale_table", 0600, dir, lq_sta,
3261 &rs_sta_dbgfs_scale_table_ops);
3262 debugfs_create_file("rate_stats_table", 0400, dir, lq_sta,
3263 &rs_sta_dbgfs_stats_table_ops);
3264 debugfs_create_file("rate_scale_data", 0400, dir, lq_sta,
3265 &rs_sta_dbgfs_rate_scale_data_ops);
3266 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
3267 &lq_sta->tx_agg_tid_en);
3268
3269 }
3270 #endif
3271
3272 /*
3273 * Initialization of rate scaling information is done by driver after
3274 * the station is added. Since mac80211 calls this function before a
3275 * station is added we ignore it.
3276 */
3277 static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband,
3278 struct cfg80211_chan_def *chandef,
3279 struct ieee80211_sta *sta, void *priv_sta)
3280 {
3281 }
3282
3283 static const struct rate_control_ops rs_ops = {
3284 .name = RS_NAME,
3285 .tx_status = rs_tx_status,
3286 .get_rate = rs_get_rate,
3287 .rate_init = rs_rate_init_stub,
3288 .alloc = rs_alloc,
3289 .free = rs_free,
3290 .alloc_sta = rs_alloc_sta,
3291 .free_sta = rs_free_sta,
3292 #ifdef CONFIG_MAC80211_DEBUGFS
3293 .add_sta_debugfs = rs_add_debugfs,
3294 #endif
3295 };
3296
3297 int iwlagn_rate_control_register(void)
3298 {
3299 return ieee80211_rate_control_register(&rs_ops);
3300 }
3301
3302 void iwlagn_rate_control_unregister(void)
3303 {
3304 ieee80211_rate_control_unregister(&rs_ops);
3305 }
3306
Linux with added FPC-III support