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1/******************************************************************************
2 *
3 * Copyright(c) 2005 - 2011 Intel Corporation. All rights reserved.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2 of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
17 *
18 * The full GNU General Public License is included in this distribution in the
19 * file called LICENSE.
20 *
21 * Contact Information:
22 * Intel Linux Wireless <ilw@linux.intel.com>
23 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
24 *
25 *****************************************************************************/
26#include <linux/kernel.h>
27#include <linux/init.h>
28#include <linux/skbuff.h>
29#include <linux/slab.h>
30#include <linux/wireless.h>
31#include <net/mac80211.h>
32
33#include <linux/netdevice.h>
34#include <linux/etherdevice.h>
35#include <linux/delay.h>
36
37#include <linux/workqueue.h>
38
39#include "iwl-dev.h"
40#include "iwl-sta.h"
41#include "iwl-core.h"
42#include "iwl-agn.h"
43
44#define RS_NAME "iwl-agn-rs"
45
46#define NUM_TRY_BEFORE_ANT_TOGGLE 1
47#define IWL_NUMBER_TRY 1
48#define IWL_HT_NUMBER_TRY 3
49
50#define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
51#define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
52#define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
53
54/* max allowed rate miss before sync LQ cmd */
55#define IWL_MISSED_RATE_MAX 15
56/* max time to accum history 2 seconds */
57#define IWL_RATE_SCALE_FLUSH_INTVL (3*HZ)
58
59static u8 rs_ht_to_legacy[] = {
60 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
61 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
62 IWL_RATE_6M_INDEX,
63 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
64 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
65 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
66 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
67};
68
69static const u8 ant_toggle_lookup[] = {
70 /*ANT_NONE -> */ ANT_NONE,
71 /*ANT_A -> */ ANT_B,
72 /*ANT_B -> */ ANT_C,
73 /*ANT_AB -> */ ANT_BC,
74 /*ANT_C -> */ ANT_A,
75 /*ANT_AC -> */ ANT_AB,
76 /*ANT_BC -> */ ANT_AC,
77 /*ANT_ABC -> */ ANT_ABC,
78};
79
80#define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np) \
81 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
82 IWL_RATE_SISO_##s##M_PLCP, \
83 IWL_RATE_MIMO2_##s##M_PLCP,\
84 IWL_RATE_MIMO3_##s##M_PLCP,\
85 IWL_RATE_##r##M_IEEE, \
86 IWL_RATE_##ip##M_INDEX, \
87 IWL_RATE_##in##M_INDEX, \
88 IWL_RATE_##rp##M_INDEX, \
89 IWL_RATE_##rn##M_INDEX, \
90 IWL_RATE_##pp##M_INDEX, \
91 IWL_RATE_##np##M_INDEX }
92
93/*
94 * Parameter order:
95 * rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
96 *
97 * If there isn't a valid next or previous rate then INV is used which
98 * maps to IWL_RATE_INVALID
99 *
100 */
101const struct iwl_rate_info iwl_rates[IWL_RATE_COUNT] = {
102 IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2), /* 1mbps */
103 IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5), /* 2mbps */
104 IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11), /*5.5mbps */
105 IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18), /* 11mbps */
106 IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11), /* 6mbps */
107 IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11), /* 9mbps */
108 IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18), /* 12mbps */
109 IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24), /* 18mbps */
110 IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36), /* 24mbps */
111 IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48), /* 36mbps */
112 IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54), /* 48mbps */
113 IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
114 IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
115 /* FIXME:RS: ^^ should be INV (legacy) */
116};
117
118static inline u8 rs_extract_rate(u32 rate_n_flags)
119{
120 return (u8)(rate_n_flags & RATE_MCS_RATE_MSK);
121}
122
123static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
124{
125 int idx = 0;
126
127 /* HT rate format */
128 if (rate_n_flags & RATE_MCS_HT_MSK) {
129 idx = rs_extract_rate(rate_n_flags);
130
131 if (idx >= IWL_RATE_MIMO3_6M_PLCP)
132 idx = idx - IWL_RATE_MIMO3_6M_PLCP;
133 else if (idx >= IWL_RATE_MIMO2_6M_PLCP)
134 idx = idx - IWL_RATE_MIMO2_6M_PLCP;
135
136 idx += IWL_FIRST_OFDM_RATE;
137 /* skip 9M not supported in ht*/
138 if (idx >= IWL_RATE_9M_INDEX)
139 idx += 1;
140 if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE))
141 return idx;
142
143 /* legacy rate format, search for match in table */
144 } else {
145 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
146 if (iwl_rates[idx].plcp ==
147 rs_extract_rate(rate_n_flags))
148 return idx;
149 }
150
151 return -1;
152}
153
154static void rs_rate_scale_perform(struct iwl_priv *priv,
155 struct sk_buff *skb,
156 struct ieee80211_sta *sta,
157 struct iwl_lq_sta *lq_sta);
158static void rs_fill_link_cmd(struct iwl_priv *priv,
159 struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
160static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
161
162
163#ifdef CONFIG_MAC80211_DEBUGFS
164static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
165 u32 *rate_n_flags, int index);
166#else
167static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
168 u32 *rate_n_flags, int index)
169{}
170#endif
171
172/**
173 * The following tables contain the expected throughput metrics for all rates
174 *
175 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
176 *
177 * where invalid entries are zeros.
178 *
179 * CCK rates are only valid in legacy table and will only be used in G
180 * (2.4 GHz) band.
181 */
182
183static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
184 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
185};
186
187static s32 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
188 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202}, /* Norm */
189 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210}, /* SGI */
190 {0, 0, 0, 0, 47, 0, 91, 133, 171, 242, 305, 334, 362}, /* AGG */
191 {0, 0, 0, 0, 52, 0, 101, 145, 187, 264, 330, 361, 390}, /* AGG+SGI */
192};
193
194static s32 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
195 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
196 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
197 {0, 0, 0, 0, 94, 0, 177, 249, 313, 423, 512, 550, 586}, /* AGG */
198 {0, 0, 0, 0, 104, 0, 193, 270, 338, 454, 545, 584, 620}, /* AGG+SGI */
199};
200
201static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
202 {0, 0, 0, 0, 74, 0, 123, 155, 179, 214, 236, 244, 251}, /* Norm */
203 {0, 0, 0, 0, 81, 0, 131, 164, 188, 223, 243, 251, 257}, /* SGI */
204 {0, 0, 0, 0, 89, 0, 167, 235, 296, 402, 488, 526, 560}, /* AGG */
205 {0, 0, 0, 0, 97, 0, 182, 255, 320, 431, 520, 558, 593}, /* AGG+SGI*/
206};
207
208static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
209 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
210 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
211 {0, 0, 0, 0, 171, 0, 305, 410, 496, 634, 731, 771, 805}, /* AGG */
212 {0, 0, 0, 0, 186, 0, 329, 439, 527, 667, 764, 803, 838}, /* AGG+SGI */
213};
214
215static s32 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = {
216 {0, 0, 0, 0, 99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */
217 {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */
218 {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */
219 {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */
220};
221
222static s32 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = {
223 {0, 0, 0, 0, 152, 0, 211, 239, 255, 279, 290, 294, 297}, /* Norm */
224 {0, 0, 0, 0, 160, 0, 219, 245, 261, 284, 294, 297, 300}, /* SGI */
225 {0, 0, 0, 0, 254, 0, 443, 584, 695, 868, 984, 1030, 1070}, /* AGG */
226 {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */
227};
228
229/* mbps, mcs */
230static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
231 { "1", "BPSK DSSS"},
232 { "2", "QPSK DSSS"},
233 {"5.5", "BPSK CCK"},
234 { "11", "QPSK CCK"},
235 { "6", "BPSK 1/2"},
236 { "9", "BPSK 1/2"},
237 { "12", "QPSK 1/2"},
238 { "18", "QPSK 3/4"},
239 { "24", "16QAM 1/2"},
240 { "36", "16QAM 3/4"},
241 { "48", "64QAM 2/3"},
242 { "54", "64QAM 3/4"},
243 { "60", "64QAM 5/6"},
244};
245
246#define MCS_INDEX_PER_STREAM (8)
247
248static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
249{
250 window->data = 0;
251 window->success_counter = 0;
252 window->success_ratio = IWL_INVALID_VALUE;
253 window->counter = 0;
254 window->average_tpt = IWL_INVALID_VALUE;
255 window->stamp = 0;
256}
257
258static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
259{
260 return (ant_type & valid_antenna) == ant_type;
261}
262
263/*
264 * removes the old data from the statistics. All data that is older than
265 * TID_MAX_TIME_DIFF, will be deleted.
266 */
267static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
268{
269 /* The oldest age we want to keep */
270 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
271
272 while (tl->queue_count &&
273 (tl->time_stamp < oldest_time)) {
274 tl->total -= tl->packet_count[tl->head];
275 tl->packet_count[tl->head] = 0;
276 tl->time_stamp += TID_QUEUE_CELL_SPACING;
277 tl->queue_count--;
278 tl->head++;
279 if (tl->head >= TID_QUEUE_MAX_SIZE)
280 tl->head = 0;
281 }
282}
283
284/*
285 * increment traffic load value for tid and also remove
286 * any old values if passed the certain time period
287 */
288static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
289 struct ieee80211_hdr *hdr)
290{
291 u32 curr_time = jiffies_to_msecs(jiffies);
292 u32 time_diff;
293 s32 index;
294 struct iwl_traffic_load *tl = NULL;
295 u8 tid;
296
297 if (ieee80211_is_data_qos(hdr->frame_control)) {
298 u8 *qc = ieee80211_get_qos_ctl(hdr);
299 tid = qc[0] & 0xf;
300 } else
301 return MAX_TID_COUNT;
302
303 if (unlikely(tid >= TID_MAX_LOAD_COUNT))
304 return MAX_TID_COUNT;
305
306 tl = &lq_data->load[tid];
307
308 curr_time -= curr_time % TID_ROUND_VALUE;
309
310 /* Happens only for the first packet. Initialize the data */
311 if (!(tl->queue_count)) {
312 tl->total = 1;
313 tl->time_stamp = curr_time;
314 tl->queue_count = 1;
315 tl->head = 0;
316 tl->packet_count[0] = 1;
317 return MAX_TID_COUNT;
318 }
319
320 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
321 index = time_diff / TID_QUEUE_CELL_SPACING;
322
323 /* The history is too long: remove data that is older than */
324 /* TID_MAX_TIME_DIFF */
325 if (index >= TID_QUEUE_MAX_SIZE)
326 rs_tl_rm_old_stats(tl, curr_time);
327
328 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
329 tl->packet_count[index] = tl->packet_count[index] + 1;
330 tl->total = tl->total + 1;
331
332 if ((index + 1) > tl->queue_count)
333 tl->queue_count = index + 1;
334
335 return tid;
336}
337
338#ifdef CONFIG_MAC80211_DEBUGFS
339/**
340 * Program the device to use fixed rate for frame transmit
341 * This is for debugging/testing only
342 * once the device start use fixed rate, we need to reload the module
343 * to being back the normal operation.
344 */
345static void rs_program_fix_rate(struct iwl_priv *priv,
346 struct iwl_lq_sta *lq_sta)
347{
348 struct iwl_station_priv *sta_priv =
349 container_of(lq_sta, struct iwl_station_priv, lq_sta);
350 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
351
352 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
353 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
354 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
355 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
356
357#ifdef CONFIG_IWLWIFI_DEVICE_SVTOOL
358 /* testmode has higher priority to overwirte the fixed rate */
359 if (priv->tm_fixed_rate)
360 lq_sta->dbg_fixed_rate = priv->tm_fixed_rate;
361#endif
362
363 IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
364 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
365
366 if (lq_sta->dbg_fixed_rate) {
367 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
368 iwl_send_lq_cmd(lq_sta->drv, ctx, &lq_sta->lq, CMD_ASYNC,
369 false);
370 }
371}
372#endif
373
374/*
375 get the traffic load value for tid
376*/
377static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
378{
379 u32 curr_time = jiffies_to_msecs(jiffies);
380 u32 time_diff;
381 s32 index;
382 struct iwl_traffic_load *tl = NULL;
383
384 if (tid >= TID_MAX_LOAD_COUNT)
385 return 0;
386
387 tl = &(lq_data->load[tid]);
388
389 curr_time -= curr_time % TID_ROUND_VALUE;
390
391 if (!(tl->queue_count))
392 return 0;
393
394 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
395 index = time_diff / TID_QUEUE_CELL_SPACING;
396
397 /* The history is too long: remove data that is older than */
398 /* TID_MAX_TIME_DIFF */
399 if (index >= TID_QUEUE_MAX_SIZE)
400 rs_tl_rm_old_stats(tl, curr_time);
401
402 return tl->total;
403}
404
405static int rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
406 struct iwl_lq_sta *lq_data, u8 tid,
407 struct ieee80211_sta *sta)
408{
409 int ret = -EAGAIN;
410 u32 load;
411
412 /*
413 * Don't create TX aggregation sessions when in high
414 * BT traffic, as they would just be disrupted by BT.
415 */
416 if (priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) {
417 IWL_ERR(priv, "BT traffic (%d), no aggregation allowed\n",
418 priv->bt_traffic_load);
419 return ret;
420 }
421
422 load = rs_tl_get_load(lq_data, tid);
423
424 if (load > IWL_AGG_LOAD_THRESHOLD) {
425 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
426 sta->addr, tid);
427 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
428 if (ret == -EAGAIN) {
429 /*
430 * driver and mac80211 is out of sync
431 * this might be cause by reloading firmware
432 * stop the tx ba session here
433 */
434 IWL_ERR(priv, "Fail start Tx agg on tid: %d\n",
435 tid);
436 ieee80211_stop_tx_ba_session(sta, tid);
437 }
438 } else {
439 IWL_DEBUG_HT(priv, "Aggregation not enabled for tid %d "
440 "because load = %u\n", tid, load);
441 }
442 return ret;
443}
444
445static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
446 struct iwl_lq_sta *lq_data,
447 struct ieee80211_sta *sta)
448{
449 if (tid < TID_MAX_LOAD_COUNT)
450 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
451 else
452 IWL_ERR(priv, "tid exceeds max load count: %d/%d\n",
453 tid, TID_MAX_LOAD_COUNT);
454}
455
456static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
457{
458 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
459 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
460 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
461}
462
463/*
464 * Static function to get the expected throughput from an iwl_scale_tbl_info
465 * that wraps a NULL pointer check
466 */
467static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
468{
469 if (tbl->expected_tpt)
470 return tbl->expected_tpt[rs_index];
471 return 0;
472}
473
474/**
475 * rs_collect_tx_data - Update the success/failure sliding window
476 *
477 * We keep a sliding window of the last 62 packets transmitted
478 * at this rate. window->data contains the bitmask of successful
479 * packets.
480 */
481static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
482 int scale_index, int attempts, int successes)
483{
484 struct iwl_rate_scale_data *window = NULL;
485 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
486 s32 fail_count, tpt;
487
488 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
489 return -EINVAL;
490
491 /* Select window for current tx bit rate */
492 window = &(tbl->win[scale_index]);
493
494 /* Get expected throughput */
495 tpt = get_expected_tpt(tbl, scale_index);
496
497 /*
498 * Keep track of only the latest 62 tx frame attempts in this rate's
499 * history window; anything older isn't really relevant any more.
500 * If we have filled up the sliding window, drop the oldest attempt;
501 * if the oldest attempt (highest bit in bitmap) shows "success",
502 * subtract "1" from the success counter (this is the main reason
503 * we keep these bitmaps!).
504 */
505 while (attempts > 0) {
506 if (window->counter >= IWL_RATE_MAX_WINDOW) {
507
508 /* remove earliest */
509 window->counter = IWL_RATE_MAX_WINDOW - 1;
510
511 if (window->data & mask) {
512 window->data &= ~mask;
513 window->success_counter--;
514 }
515 }
516
517 /* Increment frames-attempted counter */
518 window->counter++;
519
520 /* Shift bitmap by one frame to throw away oldest history */
521 window->data <<= 1;
522
523 /* Mark the most recent #successes attempts as successful */
524 if (successes > 0) {
525 window->success_counter++;
526 window->data |= 0x1;
527 successes--;
528 }
529
530 attempts--;
531 }
532
533 /* Calculate current success ratio, avoid divide-by-0! */
534 if (window->counter > 0)
535 window->success_ratio = 128 * (100 * window->success_counter)
536 / window->counter;
537 else
538 window->success_ratio = IWL_INVALID_VALUE;
539
540 fail_count = window->counter - window->success_counter;
541
542 /* Calculate average throughput, if we have enough history. */
543 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
544 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
545 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
546 else
547 window->average_tpt = IWL_INVALID_VALUE;
548
549 /* Tag this window as having been updated */
550 window->stamp = jiffies;
551
552 return 0;
553}
554
555/*
556 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
557 */
558/* FIXME:RS:remove this function and put the flags statically in the table */
559static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
560 struct iwl_scale_tbl_info *tbl,
561 int index, u8 use_green)
562{
563 u32 rate_n_flags = 0;
564
565 if (is_legacy(tbl->lq_type)) {
566 rate_n_flags = iwl_rates[index].plcp;
567 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
568 rate_n_flags |= RATE_MCS_CCK_MSK;
569
570 } else if (is_Ht(tbl->lq_type)) {
571 if (index > IWL_LAST_OFDM_RATE) {
572 IWL_ERR(priv, "Invalid HT rate index %d\n", index);
573 index = IWL_LAST_OFDM_RATE;
574 }
575 rate_n_flags = RATE_MCS_HT_MSK;
576
577 if (is_siso(tbl->lq_type))
578 rate_n_flags |= iwl_rates[index].plcp_siso;
579 else if (is_mimo2(tbl->lq_type))
580 rate_n_flags |= iwl_rates[index].plcp_mimo2;
581 else
582 rate_n_flags |= iwl_rates[index].plcp_mimo3;
583 } else {
584 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
585 }
586
587 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
588 RATE_MCS_ANT_ABC_MSK);
589
590 if (is_Ht(tbl->lq_type)) {
591 if (tbl->is_ht40) {
592 if (tbl->is_dup)
593 rate_n_flags |= RATE_MCS_DUP_MSK;
594 else
595 rate_n_flags |= RATE_MCS_HT40_MSK;
596 }
597 if (tbl->is_SGI)
598 rate_n_flags |= RATE_MCS_SGI_MSK;
599
600 if (use_green) {
601 rate_n_flags |= RATE_MCS_GF_MSK;
602 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
603 rate_n_flags &= ~RATE_MCS_SGI_MSK;
604 IWL_ERR(priv, "GF was set with SGI:SISO\n");
605 }
606 }
607 }
608 return rate_n_flags;
609}
610
611/*
612 * Interpret uCode API's rate_n_flags format,
613 * fill "search" or "active" tx mode table.
614 */
615static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
616 enum ieee80211_band band,
617 struct iwl_scale_tbl_info *tbl,
618 int *rate_idx)
619{
620 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
621 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
622 u8 mcs;
623
624 memset(tbl, 0, sizeof(struct iwl_scale_tbl_info));
625 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
626
627 if (*rate_idx == IWL_RATE_INVALID) {
628 *rate_idx = -1;
629 return -EINVAL;
630 }
631 tbl->is_SGI = 0; /* default legacy setup */
632 tbl->is_ht40 = 0;
633 tbl->is_dup = 0;
634 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
635 tbl->lq_type = LQ_NONE;
636 tbl->max_search = IWL_MAX_SEARCH;
637
638 /* legacy rate format */
639 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
640 if (num_of_ant == 1) {
641 if (band == IEEE80211_BAND_5GHZ)
642 tbl->lq_type = LQ_A;
643 else
644 tbl->lq_type = LQ_G;
645 }
646 /* HT rate format */
647 } else {
648 if (rate_n_flags & RATE_MCS_SGI_MSK)
649 tbl->is_SGI = 1;
650
651 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
652 (rate_n_flags & RATE_MCS_DUP_MSK))
653 tbl->is_ht40 = 1;
654
655 if (rate_n_flags & RATE_MCS_DUP_MSK)
656 tbl->is_dup = 1;
657
658 mcs = rs_extract_rate(rate_n_flags);
659
660 /* SISO */
661 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
662 if (num_of_ant == 1)
663 tbl->lq_type = LQ_SISO; /*else NONE*/
664 /* MIMO2 */
665 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
666 if (num_of_ant == 2)
667 tbl->lq_type = LQ_MIMO2;
668 /* MIMO3 */
669 } else {
670 if (num_of_ant == 3) {
671 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
672 tbl->lq_type = LQ_MIMO3;
673 }
674 }
675 }
676 return 0;
677}
678
679/* switch to another antenna/antennas and return 1 */
680/* if no other valid antenna found, return 0 */
681static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
682 struct iwl_scale_tbl_info *tbl)
683{
684 u8 new_ant_type;
685
686 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
687 return 0;
688
689 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
690 return 0;
691
692 new_ant_type = ant_toggle_lookup[tbl->ant_type];
693
694 while ((new_ant_type != tbl->ant_type) &&
695 !rs_is_valid_ant(valid_ant, new_ant_type))
696 new_ant_type = ant_toggle_lookup[new_ant_type];
697
698 if (new_ant_type == tbl->ant_type)
699 return 0;
700
701 tbl->ant_type = new_ant_type;
702 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
703 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
704 return 1;
705}
706
707/**
708 * Green-field mode is valid if the station supports it and
709 * there are no non-GF stations present in the BSS.
710 */
711static bool rs_use_green(struct ieee80211_sta *sta)
712{
713 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
714 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
715
716 return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
717 !(ctx->ht.non_gf_sta_present);
718}
719
720/**
721 * rs_get_supported_rates - get the available rates
722 *
723 * if management frame or broadcast frame only return
724 * basic available rates.
725 *
726 */
727static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
728 struct ieee80211_hdr *hdr,
729 enum iwl_table_type rate_type)
730{
731 if (is_legacy(rate_type)) {
732 return lq_sta->active_legacy_rate;
733 } else {
734 if (is_siso(rate_type))
735 return lq_sta->active_siso_rate;
736 else if (is_mimo2(rate_type))
737 return lq_sta->active_mimo2_rate;
738 else
739 return lq_sta->active_mimo3_rate;
740 }
741}
742
743static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
744 int rate_type)
745{
746 u8 high = IWL_RATE_INVALID;
747 u8 low = IWL_RATE_INVALID;
748
749 /* 802.11A or ht walks to the next literal adjacent rate in
750 * the rate table */
751 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
752 int i;
753 u32 mask;
754
755 /* Find the previous rate that is in the rate mask */
756 i = index - 1;
757 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
758 if (rate_mask & mask) {
759 low = i;
760 break;
761 }
762 }
763
764 /* Find the next rate that is in the rate mask */
765 i = index + 1;
766 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
767 if (rate_mask & mask) {
768 high = i;
769 break;
770 }
771 }
772
773 return (high << 8) | low;
774 }
775
776 low = index;
777 while (low != IWL_RATE_INVALID) {
778 low = iwl_rates[low].prev_rs;
779 if (low == IWL_RATE_INVALID)
780 break;
781 if (rate_mask & (1 << low))
782 break;
783 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
784 }
785
786 high = index;
787 while (high != IWL_RATE_INVALID) {
788 high = iwl_rates[high].next_rs;
789 if (high == IWL_RATE_INVALID)
790 break;
791 if (rate_mask & (1 << high))
792 break;
793 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
794 }
795
796 return (high << 8) | low;
797}
798
799static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
800 struct iwl_scale_tbl_info *tbl,
801 u8 scale_index, u8 ht_possible)
802{
803 s32 low;
804 u16 rate_mask;
805 u16 high_low;
806 u8 switch_to_legacy = 0;
807 u8 is_green = lq_sta->is_green;
808 struct iwl_priv *priv = lq_sta->drv;
809
810 /* check if we need to switch from HT to legacy rates.
811 * assumption is that mandatory rates (1Mbps or 6Mbps)
812 * are always supported (spec demand) */
813 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
814 switch_to_legacy = 1;
815 scale_index = rs_ht_to_legacy[scale_index];
816 if (lq_sta->band == IEEE80211_BAND_5GHZ)
817 tbl->lq_type = LQ_A;
818 else
819 tbl->lq_type = LQ_G;
820
821 if (num_of_ant(tbl->ant_type) > 1)
822 tbl->ant_type =
823 first_antenna(priv->hw_params.valid_tx_ant);
824
825 tbl->is_ht40 = 0;
826 tbl->is_SGI = 0;
827 tbl->max_search = IWL_MAX_SEARCH;
828 }
829
830 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
831
832 /* Mask with station rate restriction */
833 if (is_legacy(tbl->lq_type)) {
834 /* supp_rates has no CCK bits in A mode */
835 if (lq_sta->band == IEEE80211_BAND_5GHZ)
836 rate_mask = (u16)(rate_mask &
837 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
838 else
839 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
840 }
841
842 /* If we switched from HT to legacy, check current rate */
843 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
844 low = scale_index;
845 goto out;
846 }
847
848 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
849 tbl->lq_type);
850 low = high_low & 0xff;
851
852 if (low == IWL_RATE_INVALID)
853 low = scale_index;
854
855out:
856 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
857}
858
859/*
860 * Simple function to compare two rate scale table types
861 */
862static bool table_type_matches(struct iwl_scale_tbl_info *a,
863 struct iwl_scale_tbl_info *b)
864{
865 return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
866 (a->is_SGI == b->is_SGI);
867}
868
869static void rs_bt_update_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
870 struct iwl_lq_sta *lq_sta)
871{
872 struct iwl_scale_tbl_info *tbl;
873 bool full_concurrent = priv->bt_full_concurrent;
874 unsigned long flags;
875
876 if (priv->bt_ant_couple_ok) {
877 /*
878 * Is there a need to switch between
879 * full concurrency and 3-wire?
880 */
881 spin_lock_irqsave(&priv->lock, flags);
882 if (priv->bt_ci_compliance && priv->bt_ant_couple_ok)
883 full_concurrent = true;
884 else
885 full_concurrent = false;
886 spin_unlock_irqrestore(&priv->lock, flags);
887 }
888 if ((priv->bt_traffic_load != priv->last_bt_traffic_load) ||
889 (priv->bt_full_concurrent != full_concurrent)) {
890 priv->bt_full_concurrent = full_concurrent;
891
892 /* Update uCode's rate table. */
893 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
894 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
895 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
896
897 queue_work(priv->workqueue, &priv->bt_full_concurrency);
898 }
899}
900
901/*
902 * mac80211 sends us Tx status
903 */
904static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
905 struct ieee80211_sta *sta, void *priv_sta,
906 struct sk_buff *skb)
907{
908 int legacy_success;
909 int retries;
910 int rs_index, mac_index, i;
911 struct iwl_lq_sta *lq_sta = priv_sta;
912 struct iwl_link_quality_cmd *table;
913 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
914 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
915 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
916 enum mac80211_rate_control_flags mac_flags;
917 u32 tx_rate;
918 struct iwl_scale_tbl_info tbl_type;
919 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
920 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
921 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
922
923 IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
924
925 /* Treat uninitialized rate scaling data same as non-existing. */
926 if (!lq_sta) {
927 IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n");
928 return;
929 } else if (!lq_sta->drv) {
930 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
931 return;
932 }
933
934 if (!ieee80211_is_data(hdr->frame_control) ||
935 info->flags & IEEE80211_TX_CTL_NO_ACK)
936 return;
937
938 /* This packet was aggregated but doesn't carry status info */
939 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
940 !(info->flags & IEEE80211_TX_STAT_AMPDU))
941 return;
942
943 /*
944 * Ignore this Tx frame response if its initial rate doesn't match
945 * that of latest Link Quality command. There may be stragglers
946 * from a previous Link Quality command, but we're no longer interested
947 * in those; they're either from the "active" mode while we're trying
948 * to check "search" mode, or a prior "search" mode after we've moved
949 * to a new "search" mode (which might become the new "active" mode).
950 */
951 table = &lq_sta->lq;
952 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
953 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
954 if (priv->band == IEEE80211_BAND_5GHZ)
955 rs_index -= IWL_FIRST_OFDM_RATE;
956 mac_flags = info->status.rates[0].flags;
957 mac_index = info->status.rates[0].idx;
958 /* For HT packets, map MCS to PLCP */
959 if (mac_flags & IEEE80211_TX_RC_MCS) {
960 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
961 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
962 mac_index++;
963 /*
964 * mac80211 HT index is always zero-indexed; we need to move
965 * HT OFDM rates after CCK rates in 2.4 GHz band
966 */
967 if (priv->band == IEEE80211_BAND_2GHZ)
968 mac_index += IWL_FIRST_OFDM_RATE;
969 }
970 /* Here we actually compare this rate to the latest LQ command */
971 if ((mac_index < 0) ||
972 (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
973 (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
974 (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
975 (tbl_type.ant_type != info->antenna_sel_tx) ||
976 (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
977 (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
978 (rs_index != mac_index)) {
979 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate);
980 /*
981 * Since rates mis-match, the last LQ command may have failed.
982 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
983 * ... driver.
984 */
985 lq_sta->missed_rate_counter++;
986 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
987 lq_sta->missed_rate_counter = 0;
988 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
989 }
990 /* Regardless, ignore this status info for outdated rate */
991 return;
992 } else
993 /* Rate did match, so reset the missed_rate_counter */
994 lq_sta->missed_rate_counter = 0;
995
996 /* Figure out if rate scale algorithm is in active or search table */
997 if (table_type_matches(&tbl_type,
998 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
999 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1000 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1001 } else if (table_type_matches(&tbl_type,
1002 &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
1003 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1004 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1005 } else {
1006 IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n");
1007 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1008 IWL_DEBUG_RATE(priv, "active- lq:%x, ant:%x, SGI:%d\n",
1009 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
1010 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1011 IWL_DEBUG_RATE(priv, "search- lq:%x, ant:%x, SGI:%d\n",
1012 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
1013 IWL_DEBUG_RATE(priv, "actual- lq:%x, ant:%x, SGI:%d\n",
1014 tbl_type.lq_type, tbl_type.ant_type, tbl_type.is_SGI);
1015 /*
1016 * no matching table found, let's by-pass the data collection
1017 * and continue to perform rate scale to find the rate table
1018 */
1019 rs_stay_in_table(lq_sta, true);
1020 goto done;
1021 }
1022
1023 /*
1024 * Updating the frame history depends on whether packets were
1025 * aggregated.
1026 *
1027 * For aggregation, all packets were transmitted at the same rate, the
1028 * first index into rate scale table.
1029 */
1030 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1031 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
1032 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
1033 &rs_index);
1034 rs_collect_tx_data(curr_tbl, rs_index,
1035 info->status.ampdu_len,
1036 info->status.ampdu_ack_len);
1037
1038 /* Update success/fail counts if not searching for new mode */
1039 if (lq_sta->stay_in_tbl) {
1040 lq_sta->total_success += info->status.ampdu_ack_len;
1041 lq_sta->total_failed += (info->status.ampdu_len -
1042 info->status.ampdu_ack_len);
1043 }
1044 } else {
1045 /*
1046 * For legacy, update frame history with for each Tx retry.
1047 */
1048 retries = info->status.rates[0].count - 1;
1049 /* HW doesn't send more than 15 retries */
1050 retries = min(retries, 15);
1051
1052 /* The last transmission may have been successful */
1053 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1054 /* Collect data for each rate used during failed TX attempts */
1055 for (i = 0; i <= retries; ++i) {
1056 tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
1057 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
1058 &tbl_type, &rs_index);
1059 /*
1060 * Only collect stats if retried rate is in the same RS
1061 * table as active/search.
1062 */
1063 if (table_type_matches(&tbl_type, curr_tbl))
1064 tmp_tbl = curr_tbl;
1065 else if (table_type_matches(&tbl_type, other_tbl))
1066 tmp_tbl = other_tbl;
1067 else
1068 continue;
1069 rs_collect_tx_data(tmp_tbl, rs_index, 1,
1070 i < retries ? 0 : legacy_success);
1071 }
1072
1073 /* Update success/fail counts if not searching for new mode */
1074 if (lq_sta->stay_in_tbl) {
1075 lq_sta->total_success += legacy_success;
1076 lq_sta->total_failed += retries + (1 - legacy_success);
1077 }
1078 }
1079 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1080 lq_sta->last_rate_n_flags = tx_rate;
1081done:
1082 /* See if there's a better rate or modulation mode to try. */
1083 if (sta && sta->supp_rates[sband->band])
1084 rs_rate_scale_perform(priv, skb, sta, lq_sta);
1085
1086#if defined(CONFIG_MAC80211_DEBUGFS) && defined(CONFIG_IWLWIFI_DEVICE_SVTOOL)
1087 if ((priv->tm_fixed_rate) &&
1088 (priv->tm_fixed_rate != lq_sta->dbg_fixed_rate))
1089 rs_program_fix_rate(priv, lq_sta);
1090#endif
1091 if (priv->cfg->bt_params && priv->cfg->bt_params->advanced_bt_coexist)
1092 rs_bt_update_lq(priv, ctx, lq_sta);
1093}
1094
1095/*
1096 * Begin a period of staying with a selected modulation mode.
1097 * Set "stay_in_tbl" flag to prevent any mode switches.
1098 * Set frame tx success limits according to legacy vs. high-throughput,
1099 * and reset overall (spanning all rates) tx success history statistics.
1100 * These control how long we stay using same modulation mode before
1101 * searching for a new mode.
1102 */
1103static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
1104 struct iwl_lq_sta *lq_sta)
1105{
1106 IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
1107 lq_sta->stay_in_tbl = 1; /* only place this gets set */
1108 if (is_legacy) {
1109 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1110 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1111 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1112 } else {
1113 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1114 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1115 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1116 }
1117 lq_sta->table_count = 0;
1118 lq_sta->total_failed = 0;
1119 lq_sta->total_success = 0;
1120 lq_sta->flush_timer = jiffies;
1121 lq_sta->action_counter = 0;
1122}
1123
1124/*
1125 * Find correct throughput table for given mode of modulation
1126 */
1127static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1128 struct iwl_scale_tbl_info *tbl)
1129{
1130 /* Used to choose among HT tables */
1131 s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1132
1133 /* Check for invalid LQ type */
1134 if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1135 tbl->expected_tpt = expected_tpt_legacy;
1136 return;
1137 }
1138
1139 /* Legacy rates have only one table */
1140 if (is_legacy(tbl->lq_type)) {
1141 tbl->expected_tpt = expected_tpt_legacy;
1142 return;
1143 }
1144
1145 /* Choose among many HT tables depending on number of streams
1146 * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
1147 * status */
1148 if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1149 ht_tbl_pointer = expected_tpt_siso20MHz;
1150 else if (is_siso(tbl->lq_type))
1151 ht_tbl_pointer = expected_tpt_siso40MHz;
1152 else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1153 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1154 else if (is_mimo2(tbl->lq_type))
1155 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1156 else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1157 ht_tbl_pointer = expected_tpt_mimo3_20MHz;
1158 else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
1159 ht_tbl_pointer = expected_tpt_mimo3_40MHz;
1160
1161 if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */
1162 tbl->expected_tpt = ht_tbl_pointer[0];
1163 else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */
1164 tbl->expected_tpt = ht_tbl_pointer[1];
1165 else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */
1166 tbl->expected_tpt = ht_tbl_pointer[2];
1167 else /* AGG+SGI */
1168 tbl->expected_tpt = ht_tbl_pointer[3];
1169}
1170
1171/*
1172 * Find starting rate for new "search" high-throughput mode of modulation.
1173 * Goal is to find lowest expected rate (under perfect conditions) that is
1174 * above the current measured throughput of "active" mode, to give new mode
1175 * a fair chance to prove itself without too many challenges.
1176 *
1177 * This gets called when transitioning to more aggressive modulation
1178 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1179 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1180 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1181 * bit rate will typically need to increase, but not if performance was bad.
1182 */
1183static s32 rs_get_best_rate(struct iwl_priv *priv,
1184 struct iwl_lq_sta *lq_sta,
1185 struct iwl_scale_tbl_info *tbl, /* "search" */
1186 u16 rate_mask, s8 index)
1187{
1188 /* "active" values */
1189 struct iwl_scale_tbl_info *active_tbl =
1190 &(lq_sta->lq_info[lq_sta->active_tbl]);
1191 s32 active_sr = active_tbl->win[index].success_ratio;
1192 s32 active_tpt = active_tbl->expected_tpt[index];
1193
1194 /* expected "search" throughput */
1195 s32 *tpt_tbl = tbl->expected_tpt;
1196
1197 s32 new_rate, high, low, start_hi;
1198 u16 high_low;
1199 s8 rate = index;
1200
1201 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1202
1203 for (; ;) {
1204 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1205 tbl->lq_type);
1206
1207 low = high_low & 0xff;
1208 high = (high_low >> 8) & 0xff;
1209
1210 /*
1211 * Lower the "search" bit rate, to give new "search" mode
1212 * approximately the same throughput as "active" if:
1213 *
1214 * 1) "Active" mode has been working modestly well (but not
1215 * great), and expected "search" throughput (under perfect
1216 * conditions) at candidate rate is above the actual
1217 * measured "active" throughput (but less than expected
1218 * "active" throughput under perfect conditions).
1219 * OR
1220 * 2) "Active" mode has been working perfectly or very well
1221 * and expected "search" throughput (under perfect
1222 * conditions) at candidate rate is above expected
1223 * "active" throughput (under perfect conditions).
1224 */
1225 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1226 ((active_sr > IWL_RATE_DECREASE_TH) &&
1227 (active_sr <= IWL_RATE_HIGH_TH) &&
1228 (tpt_tbl[rate] <= active_tpt))) ||
1229 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1230 (tpt_tbl[rate] > active_tpt))) {
1231
1232 /* (2nd or later pass)
1233 * If we've already tried to raise the rate, and are
1234 * now trying to lower it, use the higher rate. */
1235 if (start_hi != IWL_RATE_INVALID) {
1236 new_rate = start_hi;
1237 break;
1238 }
1239
1240 new_rate = rate;
1241
1242 /* Loop again with lower rate */
1243 if (low != IWL_RATE_INVALID)
1244 rate = low;
1245
1246 /* Lower rate not available, use the original */
1247 else
1248 break;
1249
1250 /* Else try to raise the "search" rate to match "active" */
1251 } else {
1252 /* (2nd or later pass)
1253 * If we've already tried to lower the rate, and are
1254 * now trying to raise it, use the lower rate. */
1255 if (new_rate != IWL_RATE_INVALID)
1256 break;
1257
1258 /* Loop again with higher rate */
1259 else if (high != IWL_RATE_INVALID) {
1260 start_hi = high;
1261 rate = high;
1262
1263 /* Higher rate not available, use the original */
1264 } else {
1265 new_rate = rate;
1266 break;
1267 }
1268 }
1269 }
1270
1271 return new_rate;
1272}
1273
1274/*
1275 * Set up search table for MIMO2
1276 */
1277static int rs_switch_to_mimo2(struct iwl_priv *priv,
1278 struct iwl_lq_sta *lq_sta,
1279 struct ieee80211_conf *conf,
1280 struct ieee80211_sta *sta,
1281 struct iwl_scale_tbl_info *tbl, int index)
1282{
1283 u16 rate_mask;
1284 s32 rate;
1285 s8 is_green = lq_sta->is_green;
1286 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1287 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1288
1289 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1290 return -1;
1291
1292 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1293 == WLAN_HT_CAP_SM_PS_STATIC)
1294 return -1;
1295
1296 /* Need both Tx chains/antennas to support MIMO */
1297 if (priv->hw_params.tx_chains_num < 2)
1298 return -1;
1299
1300 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1301
1302 tbl->lq_type = LQ_MIMO2;
1303 tbl->is_dup = lq_sta->is_dup;
1304 tbl->action = 0;
1305 tbl->max_search = IWL_MAX_SEARCH;
1306 rate_mask = lq_sta->active_mimo2_rate;
1307
1308 if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1309 tbl->is_ht40 = 1;
1310 else
1311 tbl->is_ht40 = 0;
1312
1313 rs_set_expected_tpt_table(lq_sta, tbl);
1314
1315 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1316
1317 IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1318 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1319 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1320 rate, rate_mask);
1321 return -1;
1322 }
1323 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1324
1325 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1326 tbl->current_rate, is_green);
1327 return 0;
1328}
1329
1330/*
1331 * Set up search table for MIMO3
1332 */
1333static int rs_switch_to_mimo3(struct iwl_priv *priv,
1334 struct iwl_lq_sta *lq_sta,
1335 struct ieee80211_conf *conf,
1336 struct ieee80211_sta *sta,
1337 struct iwl_scale_tbl_info *tbl, int index)
1338{
1339 u16 rate_mask;
1340 s32 rate;
1341 s8 is_green = lq_sta->is_green;
1342 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1343 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1344
1345 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1346 return -1;
1347
1348 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1349 == WLAN_HT_CAP_SM_PS_STATIC)
1350 return -1;
1351
1352 /* Need both Tx chains/antennas to support MIMO */
1353 if (priv->hw_params.tx_chains_num < 3)
1354 return -1;
1355
1356 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1357
1358 tbl->lq_type = LQ_MIMO3;
1359 tbl->is_dup = lq_sta->is_dup;
1360 tbl->action = 0;
1361 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1362 rate_mask = lq_sta->active_mimo3_rate;
1363
1364 if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1365 tbl->is_ht40 = 1;
1366 else
1367 tbl->is_ht40 = 0;
1368
1369 rs_set_expected_tpt_table(lq_sta, tbl);
1370
1371 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1372
1373 IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1374 rate, rate_mask);
1375 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1376 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1377 rate, rate_mask);
1378 return -1;
1379 }
1380 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1381
1382 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1383 tbl->current_rate, is_green);
1384 return 0;
1385}
1386
1387/*
1388 * Set up search table for SISO
1389 */
1390static int rs_switch_to_siso(struct iwl_priv *priv,
1391 struct iwl_lq_sta *lq_sta,
1392 struct ieee80211_conf *conf,
1393 struct ieee80211_sta *sta,
1394 struct iwl_scale_tbl_info *tbl, int index)
1395{
1396 u16 rate_mask;
1397 u8 is_green = lq_sta->is_green;
1398 s32 rate;
1399 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1400 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1401
1402 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1403 return -1;
1404
1405 IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1406
1407 tbl->is_dup = lq_sta->is_dup;
1408 tbl->lq_type = LQ_SISO;
1409 tbl->action = 0;
1410 tbl->max_search = IWL_MAX_SEARCH;
1411 rate_mask = lq_sta->active_siso_rate;
1412
1413 if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1414 tbl->is_ht40 = 1;
1415 else
1416 tbl->is_ht40 = 0;
1417
1418 if (is_green)
1419 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1420
1421 rs_set_expected_tpt_table(lq_sta, tbl);
1422 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1423
1424 IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1425 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1426 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1427 rate, rate_mask);
1428 return -1;
1429 }
1430 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1431 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1432 tbl->current_rate, is_green);
1433 return 0;
1434}
1435
1436/*
1437 * Try to switch to new modulation mode from legacy
1438 */
1439static int rs_move_legacy_other(struct iwl_priv *priv,
1440 struct iwl_lq_sta *lq_sta,
1441 struct ieee80211_conf *conf,
1442 struct ieee80211_sta *sta,
1443 int index)
1444{
1445 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1446 struct iwl_scale_tbl_info *search_tbl =
1447 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1448 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1449 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1450 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1451 u8 start_action;
1452 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1453 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1454 int ret = 0;
1455 u8 update_search_tbl_counter = 0;
1456
1457 switch (priv->bt_traffic_load) {
1458 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1459 /* nothing */
1460 break;
1461 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1462 /* avoid antenna B unless MIMO */
1463 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1464 if (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2)
1465 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1466 break;
1467 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1468 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1469 /* avoid antenna B and MIMO */
1470 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1471 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2 &&
1472 tbl->action != IWL_LEGACY_SWITCH_SISO)
1473 tbl->action = IWL_LEGACY_SWITCH_SISO;
1474 break;
1475 default:
1476 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1477 break;
1478 }
1479
1480 if (!iwl_ht_enabled(priv))
1481 /* stay in Legacy */
1482 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1483 else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1484 tbl->action > IWL_LEGACY_SWITCH_SISO)
1485 tbl->action = IWL_LEGACY_SWITCH_SISO;
1486
1487 /* configure as 1x1 if bt full concurrency */
1488 if (priv->bt_full_concurrent) {
1489 if (!iwl_ht_enabled(priv))
1490 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1491 else if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1492 tbl->action = IWL_LEGACY_SWITCH_SISO;
1493 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1494 }
1495
1496 start_action = tbl->action;
1497 for (; ;) {
1498 lq_sta->action_counter++;
1499 switch (tbl->action) {
1500 case IWL_LEGACY_SWITCH_ANTENNA1:
1501 case IWL_LEGACY_SWITCH_ANTENNA2:
1502 IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1503
1504 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1505 tx_chains_num <= 1) ||
1506 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1507 tx_chains_num <= 2))
1508 break;
1509
1510 /* Don't change antenna if success has been great */
1511 if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1512 !priv->bt_full_concurrent &&
1513 priv->bt_traffic_load ==
1514 IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1515 break;
1516
1517 /* Set up search table to try other antenna */
1518 memcpy(search_tbl, tbl, sz);
1519
1520 if (rs_toggle_antenna(valid_tx_ant,
1521 &search_tbl->current_rate, search_tbl)) {
1522 update_search_tbl_counter = 1;
1523 rs_set_expected_tpt_table(lq_sta, search_tbl);
1524 goto out;
1525 }
1526 break;
1527 case IWL_LEGACY_SWITCH_SISO:
1528 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1529
1530 /* Set up search table to try SISO */
1531 memcpy(search_tbl, tbl, sz);
1532 search_tbl->is_SGI = 0;
1533 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1534 search_tbl, index);
1535 if (!ret) {
1536 lq_sta->action_counter = 0;
1537 goto out;
1538 }
1539
1540 break;
1541 case IWL_LEGACY_SWITCH_MIMO2_AB:
1542 case IWL_LEGACY_SWITCH_MIMO2_AC:
1543 case IWL_LEGACY_SWITCH_MIMO2_BC:
1544 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1545
1546 /* Set up search table to try MIMO */
1547 memcpy(search_tbl, tbl, sz);
1548 search_tbl->is_SGI = 0;
1549
1550 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1551 search_tbl->ant_type = ANT_AB;
1552 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1553 search_tbl->ant_type = ANT_AC;
1554 else
1555 search_tbl->ant_type = ANT_BC;
1556
1557 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1558 break;
1559
1560 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1561 search_tbl, index);
1562 if (!ret) {
1563 lq_sta->action_counter = 0;
1564 goto out;
1565 }
1566 break;
1567
1568 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1569 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1570
1571 /* Set up search table to try MIMO3 */
1572 memcpy(search_tbl, tbl, sz);
1573 search_tbl->is_SGI = 0;
1574
1575 search_tbl->ant_type = ANT_ABC;
1576
1577 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1578 break;
1579
1580 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1581 search_tbl, index);
1582 if (!ret) {
1583 lq_sta->action_counter = 0;
1584 goto out;
1585 }
1586 break;
1587 }
1588 tbl->action++;
1589 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1590 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1591
1592 if (tbl->action == start_action)
1593 break;
1594
1595 }
1596 search_tbl->lq_type = LQ_NONE;
1597 return 0;
1598
1599out:
1600 lq_sta->search_better_tbl = 1;
1601 tbl->action++;
1602 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1603 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1604 if (update_search_tbl_counter)
1605 search_tbl->action = tbl->action;
1606 return 0;
1607
1608}
1609
1610/*
1611 * Try to switch to new modulation mode from SISO
1612 */
1613static int rs_move_siso_to_other(struct iwl_priv *priv,
1614 struct iwl_lq_sta *lq_sta,
1615 struct ieee80211_conf *conf,
1616 struct ieee80211_sta *sta, int index)
1617{
1618 u8 is_green = lq_sta->is_green;
1619 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1620 struct iwl_scale_tbl_info *search_tbl =
1621 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1622 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1623 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1624 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1625 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1626 u8 start_action;
1627 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1628 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1629 u8 update_search_tbl_counter = 0;
1630 int ret;
1631
1632 switch (priv->bt_traffic_load) {
1633 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1634 /* nothing */
1635 break;
1636 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1637 /* avoid antenna B unless MIMO */
1638 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1639 if (tbl->action == IWL_SISO_SWITCH_ANTENNA2)
1640 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1641 break;
1642 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1643 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1644 /* avoid antenna B and MIMO */
1645 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1646 if (tbl->action != IWL_SISO_SWITCH_ANTENNA1)
1647 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1648 break;
1649 default:
1650 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1651 break;
1652 }
1653
1654 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1655 tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1656 /* stay in SISO */
1657 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1658 }
1659
1660 /* configure as 1x1 if bt full concurrency */
1661 if (priv->bt_full_concurrent) {
1662 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1663 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1664 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1665 }
1666
1667 start_action = tbl->action;
1668 for (;;) {
1669 lq_sta->action_counter++;
1670 switch (tbl->action) {
1671 case IWL_SISO_SWITCH_ANTENNA1:
1672 case IWL_SISO_SWITCH_ANTENNA2:
1673 IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1674 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1675 tx_chains_num <= 1) ||
1676 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1677 tx_chains_num <= 2))
1678 break;
1679
1680 if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1681 !priv->bt_full_concurrent &&
1682 priv->bt_traffic_load ==
1683 IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1684 break;
1685
1686 memcpy(search_tbl, tbl, sz);
1687 if (rs_toggle_antenna(valid_tx_ant,
1688 &search_tbl->current_rate, search_tbl)) {
1689 update_search_tbl_counter = 1;
1690 goto out;
1691 }
1692 break;
1693 case IWL_SISO_SWITCH_MIMO2_AB:
1694 case IWL_SISO_SWITCH_MIMO2_AC:
1695 case IWL_SISO_SWITCH_MIMO2_BC:
1696 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1697 memcpy(search_tbl, tbl, sz);
1698 search_tbl->is_SGI = 0;
1699
1700 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1701 search_tbl->ant_type = ANT_AB;
1702 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1703 search_tbl->ant_type = ANT_AC;
1704 else
1705 search_tbl->ant_type = ANT_BC;
1706
1707 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1708 break;
1709
1710 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1711 search_tbl, index);
1712 if (!ret)
1713 goto out;
1714 break;
1715 case IWL_SISO_SWITCH_GI:
1716 if (!tbl->is_ht40 && !(ht_cap->cap &
1717 IEEE80211_HT_CAP_SGI_20))
1718 break;
1719 if (tbl->is_ht40 && !(ht_cap->cap &
1720 IEEE80211_HT_CAP_SGI_40))
1721 break;
1722
1723 IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1724
1725 memcpy(search_tbl, tbl, sz);
1726 if (is_green) {
1727 if (!tbl->is_SGI)
1728 break;
1729 else
1730 IWL_ERR(priv,
1731 "SGI was set in GF+SISO\n");
1732 }
1733 search_tbl->is_SGI = !tbl->is_SGI;
1734 rs_set_expected_tpt_table(lq_sta, search_tbl);
1735 if (tbl->is_SGI) {
1736 s32 tpt = lq_sta->last_tpt / 100;
1737 if (tpt >= search_tbl->expected_tpt[index])
1738 break;
1739 }
1740 search_tbl->current_rate =
1741 rate_n_flags_from_tbl(priv, search_tbl,
1742 index, is_green);
1743 update_search_tbl_counter = 1;
1744 goto out;
1745 case IWL_SISO_SWITCH_MIMO3_ABC:
1746 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1747 memcpy(search_tbl, tbl, sz);
1748 search_tbl->is_SGI = 0;
1749 search_tbl->ant_type = ANT_ABC;
1750
1751 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1752 break;
1753
1754 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1755 search_tbl, index);
1756 if (!ret)
1757 goto out;
1758 break;
1759 }
1760 tbl->action++;
1761 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1762 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1763
1764 if (tbl->action == start_action)
1765 break;
1766 }
1767 search_tbl->lq_type = LQ_NONE;
1768 return 0;
1769
1770 out:
1771 lq_sta->search_better_tbl = 1;
1772 tbl->action++;
1773 if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1774 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1775 if (update_search_tbl_counter)
1776 search_tbl->action = tbl->action;
1777
1778 return 0;
1779}
1780
1781/*
1782 * Try to switch to new modulation mode from MIMO2
1783 */
1784static int rs_move_mimo2_to_other(struct iwl_priv *priv,
1785 struct iwl_lq_sta *lq_sta,
1786 struct ieee80211_conf *conf,
1787 struct ieee80211_sta *sta, int index)
1788{
1789 s8 is_green = lq_sta->is_green;
1790 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1791 struct iwl_scale_tbl_info *search_tbl =
1792 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1793 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1794 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1795 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1796 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1797 u8 start_action;
1798 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1799 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1800 u8 update_search_tbl_counter = 0;
1801 int ret;
1802
1803 switch (priv->bt_traffic_load) {
1804 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1805 /* nothing */
1806 break;
1807 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1808 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1809 /* avoid antenna B and MIMO */
1810 if (tbl->action != IWL_MIMO2_SWITCH_SISO_A)
1811 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1812 break;
1813 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1814 /* avoid antenna B unless MIMO */
1815 if (tbl->action == IWL_MIMO2_SWITCH_SISO_B ||
1816 tbl->action == IWL_MIMO2_SWITCH_SISO_C)
1817 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1818 break;
1819 default:
1820 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1821 break;
1822 }
1823
1824 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1825 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1826 tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1827 /* switch in SISO */
1828 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1829 }
1830
1831 /* configure as 1x1 if bt full concurrency */
1832 if (priv->bt_full_concurrent &&
1833 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1834 tbl->action > IWL_MIMO2_SWITCH_SISO_C))
1835 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1836
1837 start_action = tbl->action;
1838 for (;;) {
1839 lq_sta->action_counter++;
1840 switch (tbl->action) {
1841 case IWL_MIMO2_SWITCH_ANTENNA1:
1842 case IWL_MIMO2_SWITCH_ANTENNA2:
1843 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1844
1845 if (tx_chains_num <= 2)
1846 break;
1847
1848 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1849 break;
1850
1851 memcpy(search_tbl, tbl, sz);
1852 if (rs_toggle_antenna(valid_tx_ant,
1853 &search_tbl->current_rate, search_tbl)) {
1854 update_search_tbl_counter = 1;
1855 goto out;
1856 }
1857 break;
1858 case IWL_MIMO2_SWITCH_SISO_A:
1859 case IWL_MIMO2_SWITCH_SISO_B:
1860 case IWL_MIMO2_SWITCH_SISO_C:
1861 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1862
1863 /* Set up new search table for SISO */
1864 memcpy(search_tbl, tbl, sz);
1865
1866 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1867 search_tbl->ant_type = ANT_A;
1868 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1869 search_tbl->ant_type = ANT_B;
1870 else
1871 search_tbl->ant_type = ANT_C;
1872
1873 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1874 break;
1875
1876 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1877 search_tbl, index);
1878 if (!ret)
1879 goto out;
1880
1881 break;
1882
1883 case IWL_MIMO2_SWITCH_GI:
1884 if (!tbl->is_ht40 && !(ht_cap->cap &
1885 IEEE80211_HT_CAP_SGI_20))
1886 break;
1887 if (tbl->is_ht40 && !(ht_cap->cap &
1888 IEEE80211_HT_CAP_SGI_40))
1889 break;
1890
1891 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1892
1893 /* Set up new search table for MIMO2 */
1894 memcpy(search_tbl, tbl, sz);
1895 search_tbl->is_SGI = !tbl->is_SGI;
1896 rs_set_expected_tpt_table(lq_sta, search_tbl);
1897 /*
1898 * If active table already uses the fastest possible
1899 * modulation (dual stream with short guard interval),
1900 * and it's working well, there's no need to look
1901 * for a better type of modulation!
1902 */
1903 if (tbl->is_SGI) {
1904 s32 tpt = lq_sta->last_tpt / 100;
1905 if (tpt >= search_tbl->expected_tpt[index])
1906 break;
1907 }
1908 search_tbl->current_rate =
1909 rate_n_flags_from_tbl(priv, search_tbl,
1910 index, is_green);
1911 update_search_tbl_counter = 1;
1912 goto out;
1913
1914 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1915 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1916 memcpy(search_tbl, tbl, sz);
1917 search_tbl->is_SGI = 0;
1918 search_tbl->ant_type = ANT_ABC;
1919
1920 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1921 break;
1922
1923 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1924 search_tbl, index);
1925 if (!ret)
1926 goto out;
1927
1928 break;
1929 }
1930 tbl->action++;
1931 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1932 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1933
1934 if (tbl->action == start_action)
1935 break;
1936 }
1937 search_tbl->lq_type = LQ_NONE;
1938 return 0;
1939 out:
1940 lq_sta->search_better_tbl = 1;
1941 tbl->action++;
1942 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1943 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1944 if (update_search_tbl_counter)
1945 search_tbl->action = tbl->action;
1946
1947 return 0;
1948
1949}
1950
1951/*
1952 * Try to switch to new modulation mode from MIMO3
1953 */
1954static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1955 struct iwl_lq_sta *lq_sta,
1956 struct ieee80211_conf *conf,
1957 struct ieee80211_sta *sta, int index)
1958{
1959 s8 is_green = lq_sta->is_green;
1960 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1961 struct iwl_scale_tbl_info *search_tbl =
1962 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1963 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1964 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1965 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1966 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1967 u8 start_action;
1968 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1969 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1970 int ret;
1971 u8 update_search_tbl_counter = 0;
1972
1973 switch (priv->bt_traffic_load) {
1974 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1975 /* nothing */
1976 break;
1977 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1978 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1979 /* avoid antenna B and MIMO */
1980 if (tbl->action != IWL_MIMO3_SWITCH_SISO_A)
1981 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1982 break;
1983 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1984 /* avoid antenna B unless MIMO */
1985 if (tbl->action == IWL_MIMO3_SWITCH_SISO_B ||
1986 tbl->action == IWL_MIMO3_SWITCH_SISO_C)
1987 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1988 break;
1989 default:
1990 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1991 break;
1992 }
1993
1994 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1995 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1996 tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1997 /* switch in SISO */
1998 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1999 }
2000
2001 /* configure as 1x1 if bt full concurrency */
2002 if (priv->bt_full_concurrent &&
2003 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
2004 tbl->action > IWL_MIMO3_SWITCH_SISO_C))
2005 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
2006
2007 start_action = tbl->action;
2008 for (;;) {
2009 lq_sta->action_counter++;
2010 switch (tbl->action) {
2011 case IWL_MIMO3_SWITCH_ANTENNA1:
2012 case IWL_MIMO3_SWITCH_ANTENNA2:
2013 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
2014
2015 if (tx_chains_num <= 3)
2016 break;
2017
2018 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
2019 break;
2020
2021 memcpy(search_tbl, tbl, sz);
2022 if (rs_toggle_antenna(valid_tx_ant,
2023 &search_tbl->current_rate, search_tbl))
2024 goto out;
2025 break;
2026 case IWL_MIMO3_SWITCH_SISO_A:
2027 case IWL_MIMO3_SWITCH_SISO_B:
2028 case IWL_MIMO3_SWITCH_SISO_C:
2029 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
2030
2031 /* Set up new search table for SISO */
2032 memcpy(search_tbl, tbl, sz);
2033
2034 if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
2035 search_tbl->ant_type = ANT_A;
2036 else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
2037 search_tbl->ant_type = ANT_B;
2038 else
2039 search_tbl->ant_type = ANT_C;
2040
2041 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2042 break;
2043
2044 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
2045 search_tbl, index);
2046 if (!ret)
2047 goto out;
2048
2049 break;
2050
2051 case IWL_MIMO3_SWITCH_MIMO2_AB:
2052 case IWL_MIMO3_SWITCH_MIMO2_AC:
2053 case IWL_MIMO3_SWITCH_MIMO2_BC:
2054 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
2055
2056 memcpy(search_tbl, tbl, sz);
2057 search_tbl->is_SGI = 0;
2058 if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
2059 search_tbl->ant_type = ANT_AB;
2060 else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
2061 search_tbl->ant_type = ANT_AC;
2062 else
2063 search_tbl->ant_type = ANT_BC;
2064
2065 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2066 break;
2067
2068 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
2069 search_tbl, index);
2070 if (!ret)
2071 goto out;
2072
2073 break;
2074
2075 case IWL_MIMO3_SWITCH_GI:
2076 if (!tbl->is_ht40 && !(ht_cap->cap &
2077 IEEE80211_HT_CAP_SGI_20))
2078 break;
2079 if (tbl->is_ht40 && !(ht_cap->cap &
2080 IEEE80211_HT_CAP_SGI_40))
2081 break;
2082
2083 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
2084
2085 /* Set up new search table for MIMO */
2086 memcpy(search_tbl, tbl, sz);
2087 search_tbl->is_SGI = !tbl->is_SGI;
2088 rs_set_expected_tpt_table(lq_sta, search_tbl);
2089 /*
2090 * If active table already uses the fastest possible
2091 * modulation (dual stream with short guard interval),
2092 * and it's working well, there's no need to look
2093 * for a better type of modulation!
2094 */
2095 if (tbl->is_SGI) {
2096 s32 tpt = lq_sta->last_tpt / 100;
2097 if (tpt >= search_tbl->expected_tpt[index])
2098 break;
2099 }
2100 search_tbl->current_rate =
2101 rate_n_flags_from_tbl(priv, search_tbl,
2102 index, is_green);
2103 update_search_tbl_counter = 1;
2104 goto out;
2105 }
2106 tbl->action++;
2107 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2108 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2109
2110 if (tbl->action == start_action)
2111 break;
2112 }
2113 search_tbl->lq_type = LQ_NONE;
2114 return 0;
2115 out:
2116 lq_sta->search_better_tbl = 1;
2117 tbl->action++;
2118 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2119 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2120 if (update_search_tbl_counter)
2121 search_tbl->action = tbl->action;
2122
2123 return 0;
2124
2125}
2126
2127/*
2128 * Check whether we should continue using same modulation mode, or
2129 * begin search for a new mode, based on:
2130 * 1) # tx successes or failures while using this mode
2131 * 2) # times calling this function
2132 * 3) elapsed time in this mode (not used, for now)
2133 */
2134static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
2135{
2136 struct iwl_scale_tbl_info *tbl;
2137 int i;
2138 int active_tbl;
2139 int flush_interval_passed = 0;
2140 struct iwl_priv *priv;
2141
2142 priv = lq_sta->drv;
2143 active_tbl = lq_sta->active_tbl;
2144
2145 tbl = &(lq_sta->lq_info[active_tbl]);
2146
2147 /* If we've been disallowing search, see if we should now allow it */
2148 if (lq_sta->stay_in_tbl) {
2149
2150 /* Elapsed time using current modulation mode */
2151 if (lq_sta->flush_timer)
2152 flush_interval_passed =
2153 time_after(jiffies,
2154 (unsigned long)(lq_sta->flush_timer +
2155 IWL_RATE_SCALE_FLUSH_INTVL));
2156
2157 /*
2158 * Check if we should allow search for new modulation mode.
2159 * If many frames have failed or succeeded, or we've used
2160 * this same modulation for a long time, allow search, and
2161 * reset history stats that keep track of whether we should
2162 * allow a new search. Also (below) reset all bitmaps and
2163 * stats in active history.
2164 */
2165 if (force_search ||
2166 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
2167 (lq_sta->total_success > lq_sta->max_success_limit) ||
2168 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
2169 && (flush_interval_passed))) {
2170 IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n:",
2171 lq_sta->total_failed,
2172 lq_sta->total_success,
2173 flush_interval_passed);
2174
2175 /* Allow search for new mode */
2176 lq_sta->stay_in_tbl = 0; /* only place reset */
2177 lq_sta->total_failed = 0;
2178 lq_sta->total_success = 0;
2179 lq_sta->flush_timer = 0;
2180
2181 /*
2182 * Else if we've used this modulation mode enough repetitions
2183 * (regardless of elapsed time or success/failure), reset
2184 * history bitmaps and rate-specific stats for all rates in
2185 * active table.
2186 */
2187 } else {
2188 lq_sta->table_count++;
2189 if (lq_sta->table_count >=
2190 lq_sta->table_count_limit) {
2191 lq_sta->table_count = 0;
2192
2193 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
2194 for (i = 0; i < IWL_RATE_COUNT; i++)
2195 rs_rate_scale_clear_window(
2196 &(tbl->win[i]));
2197 }
2198 }
2199
2200 /* If transitioning to allow "search", reset all history
2201 * bitmaps and stats in active table (this will become the new
2202 * "search" table). */
2203 if (!lq_sta->stay_in_tbl) {
2204 for (i = 0; i < IWL_RATE_COUNT; i++)
2205 rs_rate_scale_clear_window(&(tbl->win[i]));
2206 }
2207 }
2208}
2209
2210/*
2211 * setup rate table in uCode
2212 * return rate_n_flags as used in the table
2213 */
2214static void rs_update_rate_tbl(struct iwl_priv *priv,
2215 struct iwl_rxon_context *ctx,
2216 struct iwl_lq_sta *lq_sta,
2217 struct iwl_scale_tbl_info *tbl,
2218 int index, u8 is_green)
2219{
2220 u32 rate;
2221
2222 /* Update uCode's rate table. */
2223 rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2224 rs_fill_link_cmd(priv, lq_sta, rate);
2225 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2226}
2227
2228/*
2229 * Do rate scaling and search for new modulation mode.
2230 */
2231static void rs_rate_scale_perform(struct iwl_priv *priv,
2232 struct sk_buff *skb,
2233 struct ieee80211_sta *sta,
2234 struct iwl_lq_sta *lq_sta)
2235{
2236 struct ieee80211_hw *hw = priv->hw;
2237 struct ieee80211_conf *conf = &hw->conf;
2238 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2239 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2240 int low = IWL_RATE_INVALID;
2241 int high = IWL_RATE_INVALID;
2242 int index;
2243 int i;
2244 struct iwl_rate_scale_data *window = NULL;
2245 int current_tpt = IWL_INVALID_VALUE;
2246 int low_tpt = IWL_INVALID_VALUE;
2247 int high_tpt = IWL_INVALID_VALUE;
2248 u32 fail_count;
2249 s8 scale_action = 0;
2250 u16 rate_mask;
2251 u8 update_lq = 0;
2252 struct iwl_scale_tbl_info *tbl, *tbl1;
2253 u16 rate_scale_index_msk = 0;
2254 u8 is_green = 0;
2255 u8 active_tbl = 0;
2256 u8 done_search = 0;
2257 u16 high_low;
2258 s32 sr;
2259 u8 tid = MAX_TID_COUNT;
2260 struct iwl_tid_data *tid_data;
2261 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
2262 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
2263
2264 IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
2265
2266 /* Send management frames and NO_ACK data using lowest rate. */
2267 /* TODO: this could probably be improved.. */
2268 if (!ieee80211_is_data(hdr->frame_control) ||
2269 info->flags & IEEE80211_TX_CTL_NO_ACK)
2270 return;
2271
2272 if (!sta || !lq_sta)
2273 return;
2274
2275 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
2276
2277 tid = rs_tl_add_packet(lq_sta, hdr);
2278 if ((tid != MAX_TID_COUNT) && (lq_sta->tx_agg_tid_en & (1 << tid))) {
2279 tid_data = &priv->stations[lq_sta->lq.sta_id].tid[tid];
2280 if (tid_data->agg.state == IWL_AGG_OFF)
2281 lq_sta->is_agg = 0;
2282 else
2283 lq_sta->is_agg = 1;
2284 } else
2285 lq_sta->is_agg = 0;
2286
2287 /*
2288 * Select rate-scale / modulation-mode table to work with in
2289 * the rest of this function: "search" if searching for better
2290 * modulation mode, or "active" if doing rate scaling within a mode.
2291 */
2292 if (!lq_sta->search_better_tbl)
2293 active_tbl = lq_sta->active_tbl;
2294 else
2295 active_tbl = 1 - lq_sta->active_tbl;
2296
2297 tbl = &(lq_sta->lq_info[active_tbl]);
2298 if (is_legacy(tbl->lq_type))
2299 lq_sta->is_green = 0;
2300 else
2301 lq_sta->is_green = rs_use_green(sta);
2302 is_green = lq_sta->is_green;
2303
2304 /* current tx rate */
2305 index = lq_sta->last_txrate_idx;
2306
2307 IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2308 tbl->lq_type);
2309
2310 /* rates available for this association, and for modulation mode */
2311 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2312
2313 IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
2314
2315 /* mask with station rate restriction */
2316 if (is_legacy(tbl->lq_type)) {
2317 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2318 /* supp_rates has no CCK bits in A mode */
2319 rate_scale_index_msk = (u16) (rate_mask &
2320 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2321 else
2322 rate_scale_index_msk = (u16) (rate_mask &
2323 lq_sta->supp_rates);
2324
2325 } else
2326 rate_scale_index_msk = rate_mask;
2327
2328 if (!rate_scale_index_msk)
2329 rate_scale_index_msk = rate_mask;
2330
2331 if (!((1 << index) & rate_scale_index_msk)) {
2332 IWL_ERR(priv, "Current Rate is not valid\n");
2333 if (lq_sta->search_better_tbl) {
2334 /* revert to active table if search table is not valid*/
2335 tbl->lq_type = LQ_NONE;
2336 lq_sta->search_better_tbl = 0;
2337 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2338 /* get "active" rate info */
2339 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2340 rs_update_rate_tbl(priv, ctx, lq_sta, tbl,
2341 index, is_green);
2342 }
2343 return;
2344 }
2345
2346 /* Get expected throughput table and history window for current rate */
2347 if (!tbl->expected_tpt) {
2348 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2349 return;
2350 }
2351
2352 /* force user max rate if set by user */
2353 if ((lq_sta->max_rate_idx != -1) &&
2354 (lq_sta->max_rate_idx < index)) {
2355 index = lq_sta->max_rate_idx;
2356 update_lq = 1;
2357 window = &(tbl->win[index]);
2358 goto lq_update;
2359 }
2360
2361 window = &(tbl->win[index]);
2362
2363 /*
2364 * If there is not enough history to calculate actual average
2365 * throughput, keep analyzing results of more tx frames, without
2366 * changing rate or mode (bypass most of the rest of this function).
2367 * Set up new rate table in uCode only if old rate is not supported
2368 * in current association (use new rate found above).
2369 */
2370 fail_count = window->counter - window->success_counter;
2371 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2372 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2373 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2374 "for index %d\n",
2375 window->success_counter, window->counter, index);
2376
2377 /* Can't calculate this yet; not enough history */
2378 window->average_tpt = IWL_INVALID_VALUE;
2379
2380 /* Should we stay with this modulation mode,
2381 * or search for a new one? */
2382 rs_stay_in_table(lq_sta, false);
2383
2384 goto out;
2385 }
2386 /* Else we have enough samples; calculate estimate of
2387 * actual average throughput */
2388 if (window->average_tpt != ((window->success_ratio *
2389 tbl->expected_tpt[index] + 64) / 128)) {
2390 IWL_ERR(priv, "expected_tpt should have been calculated by now\n");
2391 window->average_tpt = ((window->success_ratio *
2392 tbl->expected_tpt[index] + 64) / 128);
2393 }
2394
2395 /* If we are searching for better modulation mode, check success. */
2396 if (lq_sta->search_better_tbl &&
2397 (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
2398 /* If good success, continue using the "search" mode;
2399 * no need to send new link quality command, since we're
2400 * continuing to use the setup that we've been trying. */
2401 if (window->average_tpt > lq_sta->last_tpt) {
2402
2403 IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2404 "suc=%d cur-tpt=%d old-tpt=%d\n",
2405 window->success_ratio,
2406 window->average_tpt,
2407 lq_sta->last_tpt);
2408
2409 if (!is_legacy(tbl->lq_type))
2410 lq_sta->enable_counter = 1;
2411
2412 /* Swap tables; "search" becomes "active" */
2413 lq_sta->active_tbl = active_tbl;
2414 current_tpt = window->average_tpt;
2415
2416 /* Else poor success; go back to mode in "active" table */
2417 } else {
2418
2419 IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2420 "suc=%d cur-tpt=%d old-tpt=%d\n",
2421 window->success_ratio,
2422 window->average_tpt,
2423 lq_sta->last_tpt);
2424
2425 /* Nullify "search" table */
2426 tbl->lq_type = LQ_NONE;
2427
2428 /* Revert to "active" table */
2429 active_tbl = lq_sta->active_tbl;
2430 tbl = &(lq_sta->lq_info[active_tbl]);
2431
2432 /* Revert to "active" rate and throughput info */
2433 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2434 current_tpt = lq_sta->last_tpt;
2435
2436 /* Need to set up a new rate table in uCode */
2437 update_lq = 1;
2438 }
2439
2440 /* Either way, we've made a decision; modulation mode
2441 * search is done, allow rate adjustment next time. */
2442 lq_sta->search_better_tbl = 0;
2443 done_search = 1; /* Don't switch modes below! */
2444 goto lq_update;
2445 }
2446
2447 /* (Else) not in search of better modulation mode, try for better
2448 * starting rate, while staying in this mode. */
2449 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2450 tbl->lq_type);
2451 low = high_low & 0xff;
2452 high = (high_low >> 8) & 0xff;
2453
2454 /* If user set max rate, dont allow higher than user constrain */
2455 if ((lq_sta->max_rate_idx != -1) &&
2456 (lq_sta->max_rate_idx < high))
2457 high = IWL_RATE_INVALID;
2458
2459 sr = window->success_ratio;
2460
2461 /* Collect measured throughputs for current and adjacent rates */
2462 current_tpt = window->average_tpt;
2463 if (low != IWL_RATE_INVALID)
2464 low_tpt = tbl->win[low].average_tpt;
2465 if (high != IWL_RATE_INVALID)
2466 high_tpt = tbl->win[high].average_tpt;
2467
2468 scale_action = 0;
2469
2470 /* Too many failures, decrease rate */
2471 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2472 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2473 scale_action = -1;
2474
2475 /* No throughput measured yet for adjacent rates; try increase. */
2476 } else if ((low_tpt == IWL_INVALID_VALUE) &&
2477 (high_tpt == IWL_INVALID_VALUE)) {
2478
2479 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2480 scale_action = 1;
2481 else if (low != IWL_RATE_INVALID)
2482 scale_action = 0;
2483 }
2484
2485 /* Both adjacent throughputs are measured, but neither one has better
2486 * throughput; we're using the best rate, don't change it! */
2487 else if ((low_tpt != IWL_INVALID_VALUE) &&
2488 (high_tpt != IWL_INVALID_VALUE) &&
2489 (low_tpt < current_tpt) &&
2490 (high_tpt < current_tpt))
2491 scale_action = 0;
2492
2493 /* At least one adjacent rate's throughput is measured,
2494 * and may have better performance. */
2495 else {
2496 /* Higher adjacent rate's throughput is measured */
2497 if (high_tpt != IWL_INVALID_VALUE) {
2498 /* Higher rate has better throughput */
2499 if (high_tpt > current_tpt &&
2500 sr >= IWL_RATE_INCREASE_TH) {
2501 scale_action = 1;
2502 } else {
2503 scale_action = 0;
2504 }
2505
2506 /* Lower adjacent rate's throughput is measured */
2507 } else if (low_tpt != IWL_INVALID_VALUE) {
2508 /* Lower rate has better throughput */
2509 if (low_tpt > current_tpt) {
2510 IWL_DEBUG_RATE(priv,
2511 "decrease rate because of low tpt\n");
2512 scale_action = -1;
2513 } else if (sr >= IWL_RATE_INCREASE_TH) {
2514 scale_action = 1;
2515 }
2516 }
2517 }
2518
2519 /* Sanity check; asked for decrease, but success rate or throughput
2520 * has been good at old rate. Don't change it. */
2521 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2522 ((sr > IWL_RATE_HIGH_TH) ||
2523 (current_tpt > (100 * tbl->expected_tpt[low]))))
2524 scale_action = 0;
2525 if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2526 scale_action = -1;
2527 if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
2528 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2529 scale_action = -1;
2530
2531 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2532 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2533 if (lq_sta->last_bt_traffic > priv->bt_traffic_load) {
2534 /*
2535 * don't set scale_action, don't want to scale up if
2536 * the rate scale doesn't otherwise think that is a
2537 * good idea.
2538 */
2539 } else if (lq_sta->last_bt_traffic <= priv->bt_traffic_load) {
2540 scale_action = -1;
2541 }
2542 }
2543 lq_sta->last_bt_traffic = priv->bt_traffic_load;
2544
2545 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2546 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2547 /* search for a new modulation */
2548 rs_stay_in_table(lq_sta, true);
2549 goto lq_update;
2550 }
2551
2552 switch (scale_action) {
2553 case -1:
2554 /* Decrease starting rate, update uCode's rate table */
2555 if (low != IWL_RATE_INVALID) {
2556 update_lq = 1;
2557 index = low;
2558 }
2559
2560 break;
2561 case 1:
2562 /* Increase starting rate, update uCode's rate table */
2563 if (high != IWL_RATE_INVALID) {
2564 update_lq = 1;
2565 index = high;
2566 }
2567
2568 break;
2569 case 0:
2570 /* No change */
2571 default:
2572 break;
2573 }
2574
2575 IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2576 "high %d type %d\n",
2577 index, scale_action, low, high, tbl->lq_type);
2578
2579lq_update:
2580 /* Replace uCode's rate table for the destination station. */
2581 if (update_lq)
2582 rs_update_rate_tbl(priv, ctx, lq_sta, tbl, index, is_green);
2583
2584 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
2585 /* Should we stay with this modulation mode,
2586 * or search for a new one? */
2587 rs_stay_in_table(lq_sta, false);
2588 }
2589 /*
2590 * Search for new modulation mode if we're:
2591 * 1) Not changing rates right now
2592 * 2) Not just finishing up a search
2593 * 3) Allowing a new search
2594 */
2595 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2596 /* Save current throughput to compare with "search" throughput*/
2597 lq_sta->last_tpt = current_tpt;
2598
2599 /* Select a new "search" modulation mode to try.
2600 * If one is found, set up the new "search" table. */
2601 if (is_legacy(tbl->lq_type))
2602 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2603 else if (is_siso(tbl->lq_type))
2604 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2605 else if (is_mimo2(tbl->lq_type))
2606 rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2607 else
2608 rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2609
2610 /* If new "search" mode was selected, set up in uCode table */
2611 if (lq_sta->search_better_tbl) {
2612 /* Access the "search" table, clear its history. */
2613 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2614 for (i = 0; i < IWL_RATE_COUNT; i++)
2615 rs_rate_scale_clear_window(&(tbl->win[i]));
2616
2617 /* Use new "search" start rate */
2618 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2619
2620 IWL_DEBUG_RATE(priv, "Switch current mcs: %X index: %d\n",
2621 tbl->current_rate, index);
2622 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2623 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2624 } else
2625 done_search = 1;
2626 }
2627
2628 if (done_search && !lq_sta->stay_in_tbl) {
2629 /* If the "active" (non-search) mode was legacy,
2630 * and we've tried switching antennas,
2631 * but we haven't been able to try HT modes (not available),
2632 * stay with best antenna legacy modulation for a while
2633 * before next round of mode comparisons. */
2634 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2635 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2636 lq_sta->action_counter > tbl1->max_search) {
2637 IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2638 rs_set_stay_in_table(priv, 1, lq_sta);
2639 }
2640
2641 /* If we're in an HT mode, and all 3 mode switch actions
2642 * have been tried and compared, stay in this best modulation
2643 * mode for a while before next round of mode comparisons. */
2644 if (lq_sta->enable_counter &&
2645 (lq_sta->action_counter >= tbl1->max_search) &&
2646 iwl_ht_enabled(priv)) {
2647 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2648 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2649 (tid != MAX_TID_COUNT)) {
2650 tid_data =
2651 &priv->stations[lq_sta->lq.sta_id].tid[tid];
2652 if (tid_data->agg.state == IWL_AGG_OFF) {
2653 IWL_DEBUG_RATE(priv,
2654 "try to aggregate tid %d\n",
2655 tid);
2656 rs_tl_turn_on_agg(priv, tid,
2657 lq_sta, sta);
2658 }
2659 }
2660 rs_set_stay_in_table(priv, 0, lq_sta);
2661 }
2662 }
2663
2664out:
2665 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2666 i = index;
2667 lq_sta->last_txrate_idx = i;
2668}
2669
2670/**
2671 * rs_initialize_lq - Initialize a station's hardware rate table
2672 *
2673 * The uCode's station table contains a table of fallback rates
2674 * for automatic fallback during transmission.
2675 *
2676 * NOTE: This sets up a default set of values. These will be replaced later
2677 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2678 * rc80211_simple.
2679 *
2680 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2681 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2682 * which requires station table entry to exist).
2683 */
2684static void rs_initialize_lq(struct iwl_priv *priv,
2685 struct ieee80211_conf *conf,
2686 struct ieee80211_sta *sta,
2687 struct iwl_lq_sta *lq_sta)
2688{
2689 struct iwl_scale_tbl_info *tbl;
2690 int rate_idx;
2691 int i;
2692 u32 rate;
2693 u8 use_green = rs_use_green(sta);
2694 u8 active_tbl = 0;
2695 u8 valid_tx_ant;
2696 struct iwl_station_priv *sta_priv;
2697 struct iwl_rxon_context *ctx;
2698
2699 if (!sta || !lq_sta)
2700 return;
2701
2702 sta_priv = (void *)sta->drv_priv;
2703 ctx = sta_priv->common.ctx;
2704
2705 i = lq_sta->last_txrate_idx;
2706
2707 valid_tx_ant = priv->hw_params.valid_tx_ant;
2708
2709 if (!lq_sta->search_better_tbl)
2710 active_tbl = lq_sta->active_tbl;
2711 else
2712 active_tbl = 1 - lq_sta->active_tbl;
2713
2714 tbl = &(lq_sta->lq_info[active_tbl]);
2715
2716 if ((i < 0) || (i >= IWL_RATE_COUNT))
2717 i = 0;
2718
2719 rate = iwl_rates[i].plcp;
2720 tbl->ant_type = first_antenna(valid_tx_ant);
2721 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2722
2723 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2724 rate |= RATE_MCS_CCK_MSK;
2725
2726 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2727 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2728 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2729
2730 rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2731 tbl->current_rate = rate;
2732 rs_set_expected_tpt_table(lq_sta, tbl);
2733 rs_fill_link_cmd(NULL, lq_sta, rate);
2734 priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2735 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_SYNC, true);
2736}
2737
2738static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2739 struct ieee80211_tx_rate_control *txrc)
2740{
2741
2742 struct sk_buff *skb = txrc->skb;
2743 struct ieee80211_supported_band *sband = txrc->sband;
2744 struct iwl_priv *priv __maybe_unused = (struct iwl_priv *)priv_r;
2745 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2746 struct iwl_lq_sta *lq_sta = priv_sta;
2747 int rate_idx;
2748
2749 IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2750
2751 /* Get max rate if user set max rate */
2752 if (lq_sta) {
2753 lq_sta->max_rate_idx = txrc->max_rate_idx;
2754 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2755 (lq_sta->max_rate_idx != -1))
2756 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2757 if ((lq_sta->max_rate_idx < 0) ||
2758 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2759 lq_sta->max_rate_idx = -1;
2760 }
2761
2762 /* Treat uninitialized rate scaling data same as non-existing. */
2763 if (lq_sta && !lq_sta->drv) {
2764 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
2765 priv_sta = NULL;
2766 }
2767
2768 /* Send management frames and NO_ACK data using lowest rate. */
2769 if (rate_control_send_low(sta, priv_sta, txrc))
2770 return;
2771
2772 rate_idx = lq_sta->last_txrate_idx;
2773
2774 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2775 rate_idx -= IWL_FIRST_OFDM_RATE;
2776 /* 6M and 9M shared same MCS index */
2777 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2778 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2779 IWL_RATE_MIMO3_6M_PLCP)
2780 rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2781 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2782 IWL_RATE_MIMO2_6M_PLCP)
2783 rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2784 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2785 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2786 info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2787 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2788 info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
2789 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2790 info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2791 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2792 info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2793 } else {
2794 /* Check for invalid rates */
2795 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2796 ((sband->band == IEEE80211_BAND_5GHZ) &&
2797 (rate_idx < IWL_FIRST_OFDM_RATE)))
2798 rate_idx = rate_lowest_index(sband, sta);
2799 /* On valid 5 GHz rate, adjust index */
2800 else if (sband->band == IEEE80211_BAND_5GHZ)
2801 rate_idx -= IWL_FIRST_OFDM_RATE;
2802 info->control.rates[0].flags = 0;
2803 }
2804 info->control.rates[0].idx = rate_idx;
2805
2806}
2807
2808static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2809 gfp_t gfp)
2810{
2811 struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2812 struct iwl_priv *priv;
2813
2814 priv = (struct iwl_priv *)priv_rate;
2815 IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2816
2817 return &sta_priv->lq_sta;
2818}
2819
2820/*
2821 * Called after adding a new station to initialize rate scaling
2822 */
2823void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id)
2824{
2825 int i, j;
2826 struct ieee80211_hw *hw = priv->hw;
2827 struct ieee80211_conf *conf = &priv->hw->conf;
2828 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2829 struct iwl_station_priv *sta_priv;
2830 struct iwl_lq_sta *lq_sta;
2831 struct ieee80211_supported_band *sband;
2832
2833 sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2834 lq_sta = &sta_priv->lq_sta;
2835 sband = hw->wiphy->bands[conf->channel->band];
2836
2837
2838 lq_sta->lq.sta_id = sta_id;
2839
2840 for (j = 0; j < LQ_SIZE; j++)
2841 for (i = 0; i < IWL_RATE_COUNT; i++)
2842 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2843
2844 lq_sta->flush_timer = 0;
2845 lq_sta->supp_rates = sta->supp_rates[sband->band];
2846 for (j = 0; j < LQ_SIZE; j++)
2847 for (i = 0; i < IWL_RATE_COUNT; i++)
2848 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2849
2850 IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n",
2851 sta_id);
2852 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2853 * the lowest or the highest rate.. Could consider using RSSI from
2854 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2855 * after assoc.. */
2856
2857 lq_sta->is_dup = 0;
2858 lq_sta->max_rate_idx = -1;
2859 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2860 lq_sta->is_green = rs_use_green(sta);
2861 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2862 lq_sta->band = priv->band;
2863 /*
2864 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2865 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2866 */
2867 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2868 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2869 lq_sta->active_siso_rate &= ~((u16)0x2);
2870 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2871
2872 /* Same here */
2873 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2874 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2875 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2876 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2877
2878 lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2879 lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2880 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2881 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2882
2883 IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2884 lq_sta->active_siso_rate,
2885 lq_sta->active_mimo2_rate,
2886 lq_sta->active_mimo3_rate);
2887
2888 /* These values will be overridden later */
2889 lq_sta->lq.general_params.single_stream_ant_msk =
2890 first_antenna(priv->hw_params.valid_tx_ant);
2891 lq_sta->lq.general_params.dual_stream_ant_msk =
2892 priv->hw_params.valid_tx_ant &
2893 ~first_antenna(priv->hw_params.valid_tx_ant);
2894 if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2895 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2896 } else if (num_of_ant(priv->hw_params.valid_tx_ant) == 2) {
2897 lq_sta->lq.general_params.dual_stream_ant_msk =
2898 priv->hw_params.valid_tx_ant;
2899 }
2900
2901 /* as default allow aggregation for all tids */
2902 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2903 lq_sta->drv = priv;
2904
2905 /* Set last_txrate_idx to lowest rate */
2906 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2907 if (sband->band == IEEE80211_BAND_5GHZ)
2908 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2909 lq_sta->is_agg = 0;
2910#ifdef CONFIG_IWLWIFI_DEVICE_SVTOOL
2911 priv->tm_fixed_rate = 0;
2912#endif
2913#ifdef CONFIG_MAC80211_DEBUGFS
2914 lq_sta->dbg_fixed_rate = 0;
2915#endif
2916
2917 rs_initialize_lq(priv, conf, sta, lq_sta);
2918}
2919
2920static void rs_fill_link_cmd(struct iwl_priv *priv,
2921 struct iwl_lq_sta *lq_sta, u32 new_rate)
2922{
2923 struct iwl_scale_tbl_info tbl_type;
2924 int index = 0;
2925 int rate_idx;
2926 int repeat_rate = 0;
2927 u8 ant_toggle_cnt = 0;
2928 u8 use_ht_possible = 1;
2929 u8 valid_tx_ant = 0;
2930 struct iwl_station_priv *sta_priv =
2931 container_of(lq_sta, struct iwl_station_priv, lq_sta);
2932 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2933
2934 /* Override starting rate (index 0) if needed for debug purposes */
2935 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2936
2937 /* Interpret new_rate (rate_n_flags) */
2938 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2939 &tbl_type, &rate_idx);
2940
2941 if (priv && priv->bt_full_concurrent) {
2942 /* 1x1 only */
2943 tbl_type.ant_type =
2944 first_antenna(priv->hw_params.valid_tx_ant);
2945 }
2946
2947 /* How many times should we repeat the initial rate? */
2948 if (is_legacy(tbl_type.lq_type)) {
2949 ant_toggle_cnt = 1;
2950 repeat_rate = IWL_NUMBER_TRY;
2951 } else {
2952 repeat_rate = min(IWL_HT_NUMBER_TRY,
2953 LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2954 }
2955
2956 lq_cmd->general_params.mimo_delimiter =
2957 is_mimo(tbl_type.lq_type) ? 1 : 0;
2958
2959 /* Fill 1st table entry (index 0) */
2960 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2961
2962 if (num_of_ant(tbl_type.ant_type) == 1) {
2963 lq_cmd->general_params.single_stream_ant_msk =
2964 tbl_type.ant_type;
2965 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2966 lq_cmd->general_params.dual_stream_ant_msk =
2967 tbl_type.ant_type;
2968 } /* otherwise we don't modify the existing value */
2969
2970 index++;
2971 repeat_rate--;
2972 if (priv) {
2973 if (priv->bt_full_concurrent)
2974 valid_tx_ant = ANT_A;
2975 else
2976 valid_tx_ant = priv->hw_params.valid_tx_ant;
2977 }
2978
2979 /* Fill rest of rate table */
2980 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2981 /* Repeat initial/next rate.
2982 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2983 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2984 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2985 if (is_legacy(tbl_type.lq_type)) {
2986 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2987 ant_toggle_cnt++;
2988 else if (priv &&
2989 rs_toggle_antenna(valid_tx_ant,
2990 &new_rate, &tbl_type))
2991 ant_toggle_cnt = 1;
2992 }
2993
2994 /* Override next rate if needed for debug purposes */
2995 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2996
2997 /* Fill next table entry */
2998 lq_cmd->rs_table[index].rate_n_flags =
2999 cpu_to_le32(new_rate);
3000 repeat_rate--;
3001 index++;
3002 }
3003
3004 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
3005 &rate_idx);
3006
3007 if (priv && priv->bt_full_concurrent) {
3008 /* 1x1 only */
3009 tbl_type.ant_type =
3010 first_antenna(priv->hw_params.valid_tx_ant);
3011 }
3012
3013 /* Indicate to uCode which entries might be MIMO.
3014 * If initial rate was MIMO, this will finally end up
3015 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
3016 if (is_mimo(tbl_type.lq_type))
3017 lq_cmd->general_params.mimo_delimiter = index;
3018
3019 /* Get next rate */
3020 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
3021 use_ht_possible);
3022
3023 /* How many times should we repeat the next rate? */
3024 if (is_legacy(tbl_type.lq_type)) {
3025 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
3026 ant_toggle_cnt++;
3027 else if (priv &&
3028 rs_toggle_antenna(valid_tx_ant,
3029 &new_rate, &tbl_type))
3030 ant_toggle_cnt = 1;
3031
3032 repeat_rate = IWL_NUMBER_TRY;
3033 } else {
3034 repeat_rate = IWL_HT_NUMBER_TRY;
3035 }
3036
3037 /* Don't allow HT rates after next pass.
3038 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
3039 use_ht_possible = 0;
3040
3041 /* Override next rate if needed for debug purposes */
3042 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
3043
3044 /* Fill next table entry */
3045 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
3046
3047 index++;
3048 repeat_rate--;
3049 }
3050
3051 lq_cmd->agg_params.agg_frame_cnt_limit =
3052 sta_priv->max_agg_bufsize ?: LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3053 lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
3054
3055 lq_cmd->agg_params.agg_time_limit =
3056 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
3057 /*
3058 * overwrite if needed, pass aggregation time limit
3059 * to uCode in uSec
3060 */
3061 if (priv && priv->cfg->bt_params &&
3062 priv->cfg->bt_params->agg_time_limit &&
3063 priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH)
3064 lq_cmd->agg_params.agg_time_limit =
3065 cpu_to_le16(priv->cfg->bt_params->agg_time_limit);
3066}
3067
3068static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3069{
3070 return hw->priv;
3071}
3072/* rate scale requires free function to be implemented */
3073static void rs_free(void *priv_rate)
3074{
3075 return;
3076}
3077
3078static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
3079 void *priv_sta)
3080{
3081 struct iwl_priv *priv __maybe_unused = priv_r;
3082
3083 IWL_DEBUG_RATE(priv, "enter\n");
3084 IWL_DEBUG_RATE(priv, "leave\n");
3085}
3086
3087#ifdef CONFIG_MAC80211_DEBUGFS
3088static int open_file_generic(struct inode *inode, struct file *file)
3089{
3090 file->private_data = inode->i_private;
3091 return 0;
3092}
3093static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
3094 u32 *rate_n_flags, int index)
3095{
3096 struct iwl_priv *priv;
3097 u8 valid_tx_ant;
3098 u8 ant_sel_tx;
3099
3100 priv = lq_sta->drv;
3101 valid_tx_ant = priv->hw_params.valid_tx_ant;
3102 if (lq_sta->dbg_fixed_rate) {
3103 ant_sel_tx =
3104 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
3105 >> RATE_MCS_ANT_POS);
3106 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
3107 *rate_n_flags = lq_sta->dbg_fixed_rate;
3108 IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
3109 } else {
3110 lq_sta->dbg_fixed_rate = 0;
3111 IWL_ERR(priv,
3112 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
3113 ant_sel_tx, valid_tx_ant);
3114 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3115 }
3116 } else {
3117 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3118 }
3119}
3120
3121static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3122 const char __user *user_buf, size_t count, loff_t *ppos)
3123{
3124 struct iwl_lq_sta *lq_sta = file->private_data;
3125 struct iwl_priv *priv;
3126 char buf[64];
3127 size_t buf_size;
3128 u32 parsed_rate;
3129
3130
3131 priv = lq_sta->drv;
3132 memset(buf, 0, sizeof(buf));
3133 buf_size = min(count, sizeof(buf) - 1);
3134 if (copy_from_user(buf, user_buf, buf_size))
3135 return -EFAULT;
3136
3137 if (sscanf(buf, "%x", &parsed_rate) == 1)
3138 lq_sta->dbg_fixed_rate = parsed_rate;
3139 else
3140 lq_sta->dbg_fixed_rate = 0;
3141
3142 rs_program_fix_rate(priv, lq_sta);
3143
3144 return count;
3145}
3146
3147static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3148 char __user *user_buf, size_t count, loff_t *ppos)
3149{
3150 char *buff;
3151 int desc = 0;
3152 int i = 0;
3153 int index = 0;
3154 ssize_t ret;
3155
3156 struct iwl_lq_sta *lq_sta = file->private_data;
3157 struct iwl_priv *priv;
3158 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3159
3160 priv = lq_sta->drv;
3161 buff = kmalloc(1024, GFP_KERNEL);
3162 if (!buff)
3163 return -ENOMEM;
3164
3165 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3166 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
3167 lq_sta->total_failed, lq_sta->total_success,
3168 lq_sta->active_legacy_rate);
3169 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3170 lq_sta->dbg_fixed_rate);
3171 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3172 (priv->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
3173 (priv->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
3174 (priv->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
3175 desc += sprintf(buff+desc, "lq type %s\n",
3176 (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
3177 if (is_Ht(tbl->lq_type)) {
3178 desc += sprintf(buff+desc, " %s",
3179 (is_siso(tbl->lq_type)) ? "SISO" :
3180 ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
3181 desc += sprintf(buff+desc, " %s",
3182 (tbl->is_ht40) ? "40MHz" : "20MHz");
3183 desc += sprintf(buff+desc, " %s %s %s\n", (tbl->is_SGI) ? "SGI" : "",
3184 (lq_sta->is_green) ? "GF enabled" : "",
3185 (lq_sta->is_agg) ? "AGG on" : "");
3186 }
3187 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3188 lq_sta->last_rate_n_flags);
3189 desc += sprintf(buff+desc, "general:"
3190 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
3191 lq_sta->lq.general_params.flags,
3192 lq_sta->lq.general_params.mimo_delimiter,
3193 lq_sta->lq.general_params.single_stream_ant_msk,
3194 lq_sta->lq.general_params.dual_stream_ant_msk);
3195
3196 desc += sprintf(buff+desc, "agg:"
3197 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3198 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
3199 lq_sta->lq.agg_params.agg_dis_start_th,
3200 lq_sta->lq.agg_params.agg_frame_cnt_limit);
3201
3202 desc += sprintf(buff+desc,
3203 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3204 lq_sta->lq.general_params.start_rate_index[0],
3205 lq_sta->lq.general_params.start_rate_index[1],
3206 lq_sta->lq.general_params.start_rate_index[2],
3207 lq_sta->lq.general_params.start_rate_index[3]);
3208
3209 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3210 index = iwl_hwrate_to_plcp_idx(
3211 le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
3212 if (is_legacy(tbl->lq_type)) {
3213 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
3214 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3215 iwl_rate_mcs[index].mbps);
3216 } else {
3217 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
3218 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3219 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
3220 }
3221 }
3222
3223 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3224 kfree(buff);
3225 return ret;
3226}
3227
3228static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3229 .write = rs_sta_dbgfs_scale_table_write,
3230 .read = rs_sta_dbgfs_scale_table_read,
3231 .open = open_file_generic,
3232 .llseek = default_llseek,
3233};
3234static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3235 char __user *user_buf, size_t count, loff_t *ppos)
3236{
3237 char *buff;
3238 int desc = 0;
3239 int i, j;
3240 ssize_t ret;
3241
3242 struct iwl_lq_sta *lq_sta = file->private_data;
3243
3244 buff = kmalloc(1024, GFP_KERNEL);
3245 if (!buff)
3246 return -ENOMEM;
3247
3248 for (i = 0; i < LQ_SIZE; i++) {
3249 desc += sprintf(buff+desc,
3250 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
3251 "rate=0x%X\n",
3252 lq_sta->active_tbl == i ? "*" : "x",
3253 lq_sta->lq_info[i].lq_type,
3254 lq_sta->lq_info[i].is_SGI,
3255 lq_sta->lq_info[i].is_ht40,
3256 lq_sta->lq_info[i].is_dup,
3257 lq_sta->is_green,
3258 lq_sta->lq_info[i].current_rate);
3259 for (j = 0; j < IWL_RATE_COUNT; j++) {
3260 desc += sprintf(buff+desc,
3261 "counter=%d success=%d %%=%d\n",
3262 lq_sta->lq_info[i].win[j].counter,
3263 lq_sta->lq_info[i].win[j].success_counter,
3264 lq_sta->lq_info[i].win[j].success_ratio);
3265 }
3266 }
3267 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3268 kfree(buff);
3269 return ret;
3270}
3271
3272static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3273 .read = rs_sta_dbgfs_stats_table_read,
3274 .open = open_file_generic,
3275 .llseek = default_llseek,
3276};
3277
3278static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3279 char __user *user_buf, size_t count, loff_t *ppos)
3280{
3281 struct iwl_lq_sta *lq_sta = file->private_data;
3282 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3283 char buff[120];
3284 int desc = 0;
3285
3286 if (is_Ht(tbl->lq_type))
3287 desc += sprintf(buff+desc,
3288 "Bit Rate= %d Mb/s\n",
3289 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3290 else
3291 desc += sprintf(buff+desc,
3292 "Bit Rate= %d Mb/s\n",
3293 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3294
3295 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3296}
3297
3298static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3299 .read = rs_sta_dbgfs_rate_scale_data_read,
3300 .open = open_file_generic,
3301 .llseek = default_llseek,
3302};
3303
3304static void rs_add_debugfs(void *priv, void *priv_sta,
3305 struct dentry *dir)
3306{
3307 struct iwl_lq_sta *lq_sta = priv_sta;
3308 lq_sta->rs_sta_dbgfs_scale_table_file =
3309 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3310 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3311 lq_sta->rs_sta_dbgfs_stats_table_file =
3312 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3313 lq_sta, &rs_sta_dbgfs_stats_table_ops);
3314 lq_sta->rs_sta_dbgfs_rate_scale_data_file =
3315 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
3316 lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
3317 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
3318 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3319 &lq_sta->tx_agg_tid_en);
3320
3321}
3322
3323static void rs_remove_debugfs(void *priv, void *priv_sta)
3324{
3325 struct iwl_lq_sta *lq_sta = priv_sta;
3326 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3327 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
3328 debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
3329 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
3330}
3331#endif
3332
3333/*
3334 * Initialization of rate scaling information is done by driver after
3335 * the station is added. Since mac80211 calls this function before a
3336 * station is added we ignore it.
3337 */
3338static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband,
3339 struct ieee80211_sta *sta, void *priv_sta)
3340{
3341}
3342static struct rate_control_ops rs_ops = {
3343 .module = NULL,
3344 .name = RS_NAME,
3345 .tx_status = rs_tx_status,
3346 .get_rate = rs_get_rate,
3347 .rate_init = rs_rate_init_stub,
3348 .alloc = rs_alloc,
3349 .free = rs_free,
3350 .alloc_sta = rs_alloc_sta,
3351 .free_sta = rs_free_sta,
3352#ifdef CONFIG_MAC80211_DEBUGFS
3353 .add_sta_debugfs = rs_add_debugfs,
3354 .remove_sta_debugfs = rs_remove_debugfs,
3355#endif
3356};
3357
3358int iwlagn_rate_control_register(void)
3359{
3360 return ieee80211_rate_control_register(&rs_ops);
3361}
3362
3363void iwlagn_rate_control_unregister(void)
3364{
3365 ieee80211_rate_control_unregister(&rs_ops);
3366}
3367