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