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iwlagn: minor coex API changes
[deliverable/linux.git] / drivers / net / wireless / iwlwifi / iwl-agn-rs.c
CommitLineData
b481de9c
ZY		 1/******************************************************************************
2 *
1f447808 3 * Copyright(c) 2005 - 2010 Intel Corporation. All rights reserved.
b481de9c
ZY		 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:
759ef89f 22 * Intel Linux Wireless <ilw@linux.intel.com>
b481de9c
ZY		 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>
5a0e3ad6 29#include <linux/slab.h>
b481de9c
ZY		 30#include <linux/wireless.h>
31#include <net/mac80211.h>
b481de9c
ZY		 32
33#include <linux/netdevice.h>
34#include <linux/etherdevice.h>
35#include <linux/delay.h>
36
37#include <linux/workqueue.h>
38
3e0d4cb1 39#include "iwl-dev.h"
be1f3ab6 40#include "iwl-sta.h"
857485c0 41#include "iwl-core.h"
b481de9c 42
e227ceac 43#define RS_NAME "iwl-agn-rs"
b481de9c 44
aade00ce 45#define NUM_TRY_BEFORE_ANT_TOGGLE 1
b481de9c
ZY		 46#define IWL_NUMBER_TRY 1
47#define IWL_HT_NUMBER_TRY 3
48
77626355
BC		 49#define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
50#define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
51#define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
52
7d049e5a
AM		 53/* max allowed rate miss before sync LQ cmd */
54#define IWL_MISSED_RATE_MAX 15
77626355 55/* max time to accum history 2 seconds */
447fee70 56#define IWL_RATE_SCALE_FLUSH_INTVL (3*HZ)
b481de9c
ZY		 57
58static u8 rs_ht_to_legacy[] = {
59 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
60 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
61 IWL_RATE_6M_INDEX,
62 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
63 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
64 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
65 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
66};
67
aade00ce
GC		 68static const u8 ant_toggle_lookup[] = {
69 /*ANT_NONE -> */ ANT_NONE,
70 /*ANT_A -> */ ANT_B,
71 /*ANT_B -> */ ANT_C,
72 /*ANT_AB -> */ ANT_BC,
73 /*ANT_C -> */ ANT_A,
74 /*ANT_AC -> */ ANT_AB,
75 /*ANT_BC -> */ ANT_AC,
76 /*ANT_ABC -> */ ANT_ABC,
77};
78
c79dd5b5 79static void rs_rate_scale_perform(struct iwl_priv *priv,
514d65c1 80 struct sk_buff *skb,
4b7679a5
JB		 81 struct ieee80211_sta *sta,
82 struct iwl_lq_sta *lq_sta);
46f9381a 83static void rs_fill_link_cmd(struct iwl_priv *priv,
e227ceac 84 struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
da5dbb97 85static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
b481de9c
ZY		 86
87
98d7e09a 88#ifdef CONFIG_MAC80211_DEBUGFS
e227ceac
TW		 89static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
90 u32 *rate_n_flags, int index);
98d7e09a 91#else
e227ceac
TW		 92static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
93 u32 *rate_n_flags, int index)
98d7e09a
ZY		 94{}
95#endif
77626355 96
e3949d62
DH		 97/**
98 * The following tables contain the expected throughput metrics for all rates
99 *
100 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
101 *
102 * where invalid entries are zeros.
103 *
104 * CCK rates are only valid in legacy table and will only be used in G
105 * (2.4 GHz) band.
77626355 106 */
584a0f00 107
e3949d62
DH		 108static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
109 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
b481de9c
ZY		 110};
111
e3949d62
DH		 112static s32 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
113 {0, 0, 0, 0, 42, 0, 76, 102, 124, 158, 183, 193, 202}, /* Norm */
114 {0, 0, 0, 0, 46, 0, 82, 110, 132, 167, 192, 202, 210}, /* SGI */
115 {0, 0, 0, 0, 48, 0, 93, 135, 176, 251, 319, 351, 381}, /* AGG */
116 {0, 0, 0, 0, 53, 0, 102, 149, 193, 275, 348, 381, 413}, /* AGG+SGI */
b481de9c
ZY		 117};
118
e3949d62
DH		 119static s32 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
120 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
121 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
122 {0, 0, 0, 0, 96, 0, 182, 259, 328, 451, 553, 598, 640}, /* AGG */
123 {0, 0, 0, 0, 106, 0, 199, 282, 357, 487, 593, 640, 683}, /* AGG+SGI */
b481de9c
ZY		 124};
125
e3949d62
DH		 126static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
127 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250}, /* Norm */
128 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256}, /* SGI */
129 {0, 0, 0, 0, 92, 0, 175, 250, 317, 436, 534, 578, 619}, /* AGG */
130 {0, 0, 0, 0, 102, 0, 192, 273, 344, 470, 573, 619, 660}, /* AGG+SGI*/
b481de9c
ZY		 131};
132
e3949d62
DH		 133static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
134 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
135 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
136 {0, 0, 0, 0, 180, 0, 327, 446, 545, 708, 828, 878, 922}, /* AGG */
137 {0, 0, 0, 0, 197, 0, 355, 481, 584, 752, 872, 922, 966}, /* AGG+SGI */
b481de9c
ZY		 138};
139
e3949d62
DH		 140static s32 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = {
141 {0, 0, 0, 0, 99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */
142 {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */
143 {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */
144 {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */
584a0f00
WYG		 145};
146
e3949d62
DH		 147static s32 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = {
148 {0, 0, 0, 0, 152, 0, 211, 239, 255, 279, 290, 294, 297}, /* Norm */
149 {0, 0, 0, 0, 160, 0, 219, 245, 261, 284, 294, 297, 300}, /* SGI */
150 {0, 0, 0, 0, 254, 0, 443, 584, 695, 868, 984, 1030, 1070}, /* AGG */
151 {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */
584a0f00
WYG		 152};
153
12b96817 154/* mbps, mcs */
79496738 155static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
e3949d62
DH		 156 { "1", "BPSK DSSS"},
157 { "2", "QPSK DSSS"},
158 {"5.5", "BPSK CCK"},
159 { "11", "QPSK CCK"},
160 { "6", "BPSK 1/2"},
161 { "9", "BPSK 1/2"},
162 { "12", "QPSK 1/2"},
163 { "18", "QPSK 3/4"},
164 { "24", "16QAM 1/2"},
165 { "36", "16QAM 3/4"},
166 { "48", "64QAM 2/3"},
167 { "54", "64QAM 3/4"},
168 { "60", "64QAM 5/6"},
12b96817
WYG		 169};
170
a9c146b3
WYG		 171#define MCS_INDEX_PER_STREAM (8)
172
39e88504 173static inline u8 rs_extract_rate(u32 rate_n_flags)
b481de9c
ZY		 174{
175 return (u8)(rate_n_flags & 0xFF);
176}
177
e227ceac 178static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
b481de9c
ZY		 179{
180 window->data = 0;
181 window->success_counter = 0;
182 window->success_ratio = IWL_INVALID_VALUE;
183 window->counter = 0;
184 window->average_tpt = IWL_INVALID_VALUE;
185 window->stamp = 0;
b481de9c
ZY		 186}
187
aade00ce
GC		 188static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
189{
3ac7f146 190 return (ant_type & valid_antenna) == ant_type;
aade00ce
GC		 191}
192
0c11b4de
RR		 193/*
194 * removes the old data from the statistics. All data that is older than
195 * TID_MAX_TIME_DIFF, will be deleted.
196 */
e227ceac 197static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
0c11b4de
RR		 198{
199 /* The oldest age we want to keep */
200 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
201
202 while (tl->queue_count &&
203 (tl->time_stamp < oldest_time)) {
204 tl->total -= tl->packet_count[tl->head];
205 tl->packet_count[tl->head] = 0;
206 tl->time_stamp += TID_QUEUE_CELL_SPACING;
207 tl->queue_count--;
208 tl->head++;
209 if (tl->head >= TID_QUEUE_MAX_SIZE)
210 tl->head = 0;
211 }
212}
213
214/*
215 * increment traffic load value for tid and also remove
216 * any old values if passed the certain time period
217 */
e227ceac 218static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
faa29718 219 struct ieee80211_hdr *hdr)
0c11b4de
RR		 220{
221 u32 curr_time = jiffies_to_msecs(jiffies);
222 u32 time_diff;
223 s32 index;
e227ceac 224 struct iwl_traffic_load *tl = NULL;
54dbb525 225 u8 tid;
0c11b4de 226
417f114b 227 if (ieee80211_is_data_qos(hdr->frame_control)) {
fd7c8a40 228 u8 *qc = ieee80211_get_qos_ctl(hdr);
54dbb525
TW		 229 tid = qc[0] & 0xf;
230 } else
faa29718 231 return MAX_TID_COUNT;
0c11b4de 232
e6a6cf4c
RC		 233 if (unlikely(tid >= TID_MAX_LOAD_COUNT))
234 return MAX_TID_COUNT;
235
0c11b4de
RR		 236 tl = &lq_data->load[tid];
237
238 curr_time -= curr_time % TID_ROUND_VALUE;
239
240 /* Happens only for the first packet. Initialize the data */
241 if (!(tl->queue_count)) {
242 tl->total = 1;
243 tl->time_stamp = curr_time;
244 tl->queue_count = 1;
245 tl->head = 0;
246 tl->packet_count[0] = 1;
faa29718 247 return MAX_TID_COUNT;
0c11b4de
RR		 248 }
249
250 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
251 index = time_diff / TID_QUEUE_CELL_SPACING;
252
253 /* The history is too long: remove data that is older than */
254 /* TID_MAX_TIME_DIFF */
255 if (index >= TID_QUEUE_MAX_SIZE)
256 rs_tl_rm_old_stats(tl, curr_time);
257
258 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
259 tl->packet_count[index] = tl->packet_count[index] + 1;
260 tl->total = tl->total + 1;
261
262 if ((index + 1) > tl->queue_count)
263 tl->queue_count = index + 1;
faa29718
RR		 264
265 return tid;
0c11b4de
RR		 266}
267
268/*
269 get the traffic load value for tid
270*/
e227ceac 271static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
0c11b4de
RR		 272{
273 u32 curr_time = jiffies_to_msecs(jiffies);
274 u32 time_diff;
275 s32 index;
e227ceac 276 struct iwl_traffic_load *tl = NULL;
0c11b4de
RR		 277
278 if (tid >= TID_MAX_LOAD_COUNT)
279 return 0;
280
281 tl = &(lq_data->load[tid]);
282
283 curr_time -= curr_time % TID_ROUND_VALUE;
284
285 if (!(tl->queue_count))
286 return 0;
287
288 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
289 index = time_diff / TID_QUEUE_CELL_SPACING;
290
291 /* The history is too long: remove data that is older than */
292 /* TID_MAX_TIME_DIFF */
293 if (index >= TID_QUEUE_MAX_SIZE)
294 rs_tl_rm_old_stats(tl, curr_time);
295
296 return tl->total;
297}
298
82ca9341 299static int rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
e227ceac 300 struct iwl_lq_sta *lq_data, u8 tid,
4b7679a5 301 struct ieee80211_sta *sta)
0c11b4de 302{
82ca9341 303 int ret = -EAGAIN;
290f599c
JB		 304 u32 load;
305
306 /*
307 * Don't create TX aggregation sessions when in high
308 * BT traffic, as they would just be disrupted by BT.
309 */
310 if (priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) {
311 IWL_ERR(priv, "BT traffic (%d), no aggregation allowed\n",
312 priv->bt_traffic_load);
313 return ret;
314 }
315
316 load = rs_tl_get_load(lq_data, tid);
45d42700 317
2411054a 318 if (load > IWL_AGG_LOAD_THRESHOLD) {
e1623446 319 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
e174961c 320 sta->addr, tid);
45d42700
WYG		 321 ret = ieee80211_start_tx_ba_session(sta, tid);
322 if (ret == -EAGAIN) {
323 /*
324 * driver and mac80211 is out of sync
325 * this might be cause by reloading firmware
326 * stop the tx ba session here
327 */
2411054a 328 IWL_ERR(priv, "Fail start Tx agg on tid: %d\n",
45d42700 329 tid);
6a8579d0 330 ieee80211_stop_tx_ba_session(sta, tid);
45d42700 331 }
2411054a
AL		 332 } else {
333 IWL_ERR(priv, "Aggregation not enabled for tid %d "
334 "because load = %u\n", tid, load);
335 }
82ca9341 336 return ret;
0c11b4de
RR		 337}
338
c79dd5b5 339static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
e227ceac 340 struct iwl_lq_sta *lq_data,
4b7679a5 341 struct ieee80211_sta *sta)
0c11b4de 342{
cfecc6b4
WYG		 343 if (tid < TID_MAX_LOAD_COUNT)
344 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
345 else
346 IWL_ERR(priv, "tid exceeds max load count: %d/%d\n",
347 tid, TID_MAX_LOAD_COUNT);
0c11b4de
RR		 348}
349
39e88504 350static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
fde0db31 351{
3ac7f146
TW		 352 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
353 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
354 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
fde0db31
GC		 355}
356
04f2dec1
SZ		 357/*
358 * Static function to get the expected throughput from an iwl_scale_tbl_info
359 * that wraps a NULL pointer check
360 */
361static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
362{
363 if (tbl->expected_tpt)
364 return tbl->expected_tpt[rs_index];
365 return 0;
366}
367
77626355
BC		 368/**
369 * rs_collect_tx_data - Update the success/failure sliding window
370 *
371 * We keep a sliding window of the last 62 packets transmitted
372 * at this rate. window->data contains the bitmask of successful
373 * packets.
374 */
04f2dec1
SZ		 375static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
376 int scale_index, int attempts, int successes)
b481de9c 377{
e227ceac 378 struct iwl_rate_scale_data *window = NULL;
39e88504 379 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
04f2dec1 380 s32 fail_count, tpt;
b481de9c 381
dc2453ae
TW		 382 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
383 return -EINVAL;
b481de9c 384
e3949d62 385 /* Select window for current tx bit rate */
04f2dec1
SZ		 386 window = &(tbl->win[scale_index]);
387
388 /* Get expected throughput */
389 tpt = get_expected_tpt(tbl, scale_index);
b481de9c 390
77626355
BC		 391 /*
392 * Keep track of only the latest 62 tx frame attempts in this rate's
393 * history window; anything older isn't really relevant any more.
394 * If we have filled up the sliding window, drop the oldest attempt;
395 * if the oldest attempt (highest bit in bitmap) shows "success",
396 * subtract "1" from the success counter (this is the main reason
397 * we keep these bitmaps!).
398 */
e3949d62 399 while (attempts > 0) {
39e88504
GC		 400 if (window->counter >= IWL_RATE_MAX_WINDOW) {
401
402 /* remove earliest */
403 window->counter = IWL_RATE_MAX_WINDOW - 1;
404
99556438
RR		 405 if (window->data & mask) {
406 window->data &= ~mask;
39e88504 407 window->success_counter--;
99556438 408 }
b481de9c 409 }
b481de9c 410
99556438
RR		 411 /* Increment frames-attempted counter */
412 window->counter++;
413
e3949d62 414 /* Shift bitmap by one frame to throw away oldest history */
90d7795e 415 window->data <<= 1;
e3949d62
DH		 416
417 /* Mark the most recent #successes attempts as successful */
99556438 418 if (successes > 0) {
39e88504 419 window->success_counter++;
99556438
RR		 420 window->data |= 0x1;
421 successes--;
422 }
77626355 423
e3949d62 424 attempts--;
b481de9c
ZY		 425 }
426
77626355 427 /* Calculate current success ratio, avoid divide-by-0! */
b481de9c
ZY		 428 if (window->counter > 0)
429 window->success_ratio = 128 * (100 * window->success_counter)
430 / window->counter;
431 else
432 window->success_ratio = IWL_INVALID_VALUE;
433
434 fail_count = window->counter - window->success_counter;
435
77626355 436 /* Calculate average throughput, if we have enough history. */
b481de9c
ZY		 437 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
438 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
439 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
440 else
441 window->average_tpt = IWL_INVALID_VALUE;
442
77626355 443 /* Tag this window as having been updated */
b481de9c
ZY		 444 window->stamp = jiffies;
445
dc2453ae 446 return 0;
b481de9c
ZY		 447}
448
77626355
BC		 449/*
450 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
451 */
39e88504 452/* FIXME:RS:remove this function and put the flags statically in the table */
978785a3
TW		 453static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
454 struct iwl_scale_tbl_info *tbl,
455 int index, u8 use_green)
b481de9c 456{
39e88504
GC		 457 u32 rate_n_flags = 0;
458
b481de9c 459 if (is_legacy(tbl->lq_type)) {
1826dcc0 460 rate_n_flags = iwl_rates[index].plcp;
b481de9c 461 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
39e88504 462 rate_n_flags |= RATE_MCS_CCK_MSK;
b481de9c 463
fde0db31
GC		 464 } else if (is_Ht(tbl->lq_type)) {
465 if (index > IWL_LAST_OFDM_RATE) {
978785a3 466 IWL_ERR(priv, "Invalid HT rate index %d\n", index);
b481de9c 467 index = IWL_LAST_OFDM_RATE;
fde0db31 468 }
39e88504 469 rate_n_flags = RATE_MCS_HT_MSK;
fde0db31
GC		 470
471 if (is_siso(tbl->lq_type))
1826dcc0 472 rate_n_flags |= iwl_rates[index].plcp_siso;
fde0db31 473 else if (is_mimo2(tbl->lq_type))
1826dcc0 474 rate_n_flags |= iwl_rates[index].plcp_mimo2;
fde0db31 475 else
1826dcc0 476 rate_n_flags |= iwl_rates[index].plcp_mimo3;
b481de9c 477 } else {
978785a3 478 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
b481de9c
ZY		 479 }
480
39e88504 481 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
fde0db31 482 RATE_MCS_ANT_ABC_MSK);
b481de9c 483
39e88504 484 if (is_Ht(tbl->lq_type)) {
7aafef1c 485 if (tbl->is_ht40) {
39e88504
GC		 486 if (tbl->is_dup)
487 rate_n_flags |= RATE_MCS_DUP_MSK;
488 else
7aafef1c 489 rate_n_flags |= RATE_MCS_HT40_MSK;
39e88504
GC		 490 }
491 if (tbl->is_SGI)
492 rate_n_flags |= RATE_MCS_SGI_MSK;
493
494 if (use_green) {
495 rate_n_flags |= RATE_MCS_GF_MSK;
496 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
497 rate_n_flags &= ~RATE_MCS_SGI_MSK;
978785a3 498 IWL_ERR(priv, "GF was set with SGI:SISO\n");
39e88504
GC		 499 }
500 }
b481de9c 501 }
39e88504 502 return rate_n_flags;
b481de9c
ZY		 503}
504
77626355
BC		 505/*
506 * Interpret uCode API's rate_n_flags format,
507 * fill "search" or "active" tx mode table.
508 */
39e88504 509static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
8318d78a 510 enum ieee80211_band band,
e227ceac 511 struct iwl_scale_tbl_info *tbl,
b481de9c
ZY		 512 int *rate_idx)
513{
39e88504
GC		 514 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
515 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
516 u8 mcs;
b481de9c 517
80e9158c 518 memset(tbl, 0, sizeof(struct iwl_scale_tbl_info));
e7d326ac 519 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
b481de9c 520
fde0db31 521 if (*rate_idx == IWL_RATE_INVALID) {
b481de9c 522 *rate_idx = -1;
dc2453ae 523 return -EINVAL;
b481de9c 524 }
77626355 525 tbl->is_SGI = 0; /* default legacy setup */
7aafef1c 526 tbl->is_ht40 = 0;
b481de9c 527 tbl->is_dup = 0;
fde0db31
GC		 528 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
529 tbl->lq_type = LQ_NONE;
d6e93399 530 tbl->max_search = IWL_MAX_SEARCH;
b481de9c 531
77626355 532 /* legacy rate format */
39e88504 533 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
fde0db31 534 if (num_of_ant == 1) {
8318d78a 535 if (band == IEEE80211_BAND_5GHZ)
b481de9c
ZY		 536 tbl->lq_type = LQ_A;
537 else
538 tbl->lq_type = LQ_G;
b481de9c 539 }
fde0db31 540 /* HT rate format */
b481de9c 541 } else {
39e88504 542 if (rate_n_flags & RATE_MCS_SGI_MSK)
b481de9c
ZY		 543 tbl->is_SGI = 1;
544
7aafef1c 545 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
39e88504 546 (rate_n_flags & RATE_MCS_DUP_MSK))
7aafef1c 547 tbl->is_ht40 = 1;
b481de9c 548
39e88504 549 if (rate_n_flags & RATE_MCS_DUP_MSK)
b481de9c 550 tbl->is_dup = 1;
fde0db31 551
39e88504 552 mcs = rs_extract_rate(rate_n_flags);
fde0db31 553
39e88504
GC		 554 /* SISO */
555 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
fde0db31
GC		 556 if (num_of_ant == 1)
557 tbl->lq_type = LQ_SISO; /*else NONE*/
558 /* MIMO2 */
39e88504 559 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
fde0db31
GC		 560 if (num_of_ant == 2)
561 tbl->lq_type = LQ_MIMO2;
562 /* MIMO3 */
563 } else {
d6e93399
MA		 564 if (num_of_ant == 3) {
565 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
fde0db31 566 tbl->lq_type = LQ_MIMO3;
d6e93399 567 }
fde0db31 568 }
b481de9c
ZY		 569 }
570 return 0;
571}
aade00ce
GC		 572
573/* switch to another antenna/antennas and return 1 */
574/* if no other valid antenna found, return 0 */
575static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
e227ceac 576 struct iwl_scale_tbl_info *tbl)
b481de9c 577{
aade00ce
GC		 578 u8 new_ant_type;
579
580 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
581 return 0;
582
583 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
584 return 0;
585
586 new_ant_type = ant_toggle_lookup[tbl->ant_type];
587
588 while ((new_ant_type != tbl->ant_type) &&
589 !rs_is_valid_ant(valid_ant, new_ant_type))
590 new_ant_type = ant_toggle_lookup[new_ant_type];
591
592 if (new_ant_type == tbl->ant_type)
593 return 0;
594
595 tbl->ant_type = new_ant_type;
596 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
597 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
598 return 1;
b481de9c
ZY		 599}
600
b261793d
DH		 601/**
602 * Green-field mode is valid if the station supports it and
603 * there are no non-GF stations present in the BSS.
604 */
7e6a5886 605static bool rs_use_green(struct ieee80211_sta *sta)
b481de9c 606{
7e6a5886
JB		 607 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
608 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
609
b261793d 610 return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
7e6a5886 611 !(ctx->ht.non_gf_sta_present);
b481de9c
ZY		 612}
613
614/**
615 * rs_get_supported_rates - get the available rates
616 *
617 * if management frame or broadcast frame only return
618 * basic available rates.
619 *
620 */
e227ceac
TW		 621static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
622 struct ieee80211_hdr *hdr,
623 enum iwl_table_type rate_type)
b481de9c 624{
eecd6e57
GC		 625 if (is_legacy(rate_type)) {
626 return lq_sta->active_legacy_rate;
627 } else {
b481de9c 628 if (is_siso(rate_type))
eecd6e57 629 return lq_sta->active_siso_rate;
fde0db31 630 else if (is_mimo2(rate_type))
eecd6e57 631 return lq_sta->active_mimo2_rate;
b481de9c 632 else
eecd6e57 633 return lq_sta->active_mimo3_rate;
c33104f0 634 }
b481de9c
ZY		 635}
636
bf403db8
EK		 637static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
638 int rate_type)
b481de9c
ZY		 639{
640 u8 high = IWL_RATE_INVALID;
641 u8 low = IWL_RATE_INVALID;
642
01ebd063 643 /* 802.11A or ht walks to the next literal adjacent rate in
b481de9c
ZY		 644 * the rate table */
645 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
646 int i;
647 u32 mask;
648
649 /* Find the previous rate that is in the rate mask */
650 i = index - 1;
651 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
652 if (rate_mask & mask) {
653 low = i;
654 break;
655 }
656 }
657
658 /* Find the next rate that is in the rate mask */
659 i = index + 1;
660 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
661 if (rate_mask & mask) {
662 high = i;
663 break;
664 }
665 }
666
667 return (high << 8) | low;
668 }
669
670 low = index;
671 while (low != IWL_RATE_INVALID) {
1826dcc0 672 low = iwl_rates[low].prev_rs;
b481de9c
ZY		 673 if (low == IWL_RATE_INVALID)
674 break;
675 if (rate_mask & (1 << low))
676 break;
e1623446 677 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
b481de9c
ZY		 678 }
679
680 high = index;
681 while (high != IWL_RATE_INVALID) {
1826dcc0 682 high = iwl_rates[high].next_rs;
b481de9c
ZY		 683 if (high == IWL_RATE_INVALID)
684 break;
685 if (rate_mask & (1 << high))
686 break;
e1623446 687 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
b481de9c
ZY		 688 }
689
690 return (high << 8) | low;
691}
692
e227ceac
TW		 693static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
694 struct iwl_scale_tbl_info *tbl,
695 u8 scale_index, u8 ht_possible)
b481de9c 696{
b481de9c
ZY		 697 s32 low;
698 u16 rate_mask;
699 u16 high_low;
700 u8 switch_to_legacy = 0;
c33104f0 701 u8 is_green = lq_sta->is_green;
2ff6578b 702 struct iwl_priv *priv = lq_sta->drv;
b481de9c
ZY		 703
704 /* check if we need to switch from HT to legacy rates.
705 * assumption is that mandatory rates (1Mbps or 6Mbps)
706 * are always supported (spec demand) */
707 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
708 switch_to_legacy = 1;
709 scale_index = rs_ht_to_legacy[scale_index];
8318d78a 710 if (lq_sta->band == IEEE80211_BAND_5GHZ)
b481de9c
ZY		 711 tbl->lq_type = LQ_A;
712 else
713 tbl->lq_type = LQ_G;
714
69fdb309 715 if (num_of_ant(tbl->ant_type) > 1)
2ff6578b
WYG		 716 tbl->ant_type =
717 first_antenna(priv->hw_params.valid_tx_ant);
b481de9c 718
7aafef1c 719 tbl->is_ht40 = 0;
b481de9c 720 tbl->is_SGI = 0;
d6e93399 721 tbl->max_search = IWL_MAX_SEARCH;
b481de9c
ZY		 722 }
723
eecd6e57 724 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
b481de9c 725
77626355 726 /* Mask with station rate restriction */
b481de9c 727 if (is_legacy(tbl->lq_type)) {
77626355 728 /* supp_rates has no CCK bits in A mode */
8318d78a 729 if (lq_sta->band == IEEE80211_BAND_5GHZ)
b481de9c 730 rate_mask = (u16)(rate_mask &
c33104f0 731 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
b481de9c 732 else
c33104f0 733 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
b481de9c
ZY		 734 }
735
77626355 736 /* If we switched from HT to legacy, check current rate */
dc2453ae 737 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
39e88504
GC		 738 low = scale_index;
739 goto out;
b481de9c
ZY		 740 }
741
bf403db8
EK		 742 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
743 tbl->lq_type);
b481de9c
ZY		 744 low = high_low & 0xff;
745
39e88504
GC		 746 if (low == IWL_RATE_INVALID)
747 low = scale_index;
748
749out:
978785a3 750 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
b481de9c
ZY		 751}
752
95407aa4
DH		 753/*
754 * Simple function to compare two rate scale table types
755 */
756static bool table_type_matches(struct iwl_scale_tbl_info *a,
757 struct iwl_scale_tbl_info *b)
758{
759 return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
760 (a->is_SGI == b->is_SGI);
761}
95407aa4 762
7e6a5886
JB		 763static void rs_bt_update_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
764 struct iwl_lq_sta *lq_sta)
bee008b7
WYG		 765{
766 struct iwl_scale_tbl_info *tbl;
767 bool full_concurrent;
768 unsigned long flags;
769
770 spin_lock_irqsave(&priv->lock, flags);
771 if (priv->bt_ci_compliance && priv->bt_ant_couple_ok)
772 full_concurrent = true;
773 else
774 full_concurrent = false;
775 spin_unlock_irqrestore(&priv->lock, flags);
776
777 if (priv->bt_full_concurrent != full_concurrent) {
778 priv->bt_full_concurrent = full_concurrent;
779
780 /* Update uCode's rate table. */
781 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
782 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
7e6a5886 783 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
bee008b7
WYG		 784
785 queue_work(priv->workqueue, &priv->bt_full_concurrency);
786 }
787}
788
77626355
BC		 789/*
790 * mac80211 sends us Tx status
791 */
4b7679a5
JB		 792static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
793 struct ieee80211_sta *sta, void *priv_sta,
e039fa4a 794 struct sk_buff *skb)
b481de9c 795{
95407aa4
DH		 796 int legacy_success;
797 int retries;
798 int rs_index, mac_index, i;
417f114b 799 struct iwl_lq_sta *lq_sta = priv_sta;
66c73db7 800 struct iwl_link_quality_cmd *table;
b481de9c 801 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
4b7679a5 802 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
e039fa4a 803 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
5027309b 804 enum mac80211_rate_control_flags mac_flags;
39e88504 805 u32 tx_rate;
e227ceac 806 struct iwl_scale_tbl_info tbl_type;
04f2dec1 807 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
7e6a5886
JB		 808 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
809 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
b481de9c 810
e1623446 811 IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
b481de9c 812
fe6b23dd
RC		 813 /* Treat uninitialized rate scaling data same as non-existing. */
814 if (!lq_sta) {
815 IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n");
816 return;
817 } else if (!lq_sta->drv) {
818 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
819 return;
820 }
821
417f114b 822 if (!ieee80211_is_data(hdr->frame_control) ||
514d65c1 823 info->flags & IEEE80211_TX_CTL_NO_ACK)
b481de9c
ZY		 824 return;
825
e3949d62 826 /* This packet was aggregated but doesn't carry status info */
e039fa4a
JB		 827 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
828 !(info->flags & IEEE80211_TX_STAT_AMPDU))
99556438
RR		 829 return;
830
77626355
BC		 831 /*
832 * Ignore this Tx frame response if its initial rate doesn't match
833 * that of latest Link Quality command. There may be stragglers
834 * from a previous Link Quality command, but we're no longer interested
835 * in those; they're either from the "active" mode while we're trying
836 * to check "search" mode, or a prior "search" mode after we've moved
837 * to a new "search" mode (which might become the new "active" mode).
838 */
95407aa4 839 table = &lq_sta->lq;
39e88504
GC		 840 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
841 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
4c424e4c
RR		 842 if (priv->band == IEEE80211_BAND_5GHZ)
843 rs_index -= IWL_FIRST_OFDM_RATE;
5027309b
DH		 844 mac_flags = info->status.rates[0].flags;
845 mac_index = info->status.rates[0].idx;
31513be8
DH		 846 /* For HT packets, map MCS to PLCP */
847 if (mac_flags & IEEE80211_TX_RC_MCS) {
848 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
849 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
850 mac_index++;
392a0baf
DH		 851 /*
852 * mac80211 HT index is always zero-indexed; we need to move
853 * HT OFDM rates after CCK rates in 2.4 GHz band
854 */
855 if (priv->band == IEEE80211_BAND_2GHZ)
856 mac_index += IWL_FIRST_OFDM_RATE;
31513be8 857 }
95407aa4 858 /* Here we actually compare this rate to the latest LQ command */
5027309b
DH		 859 if ((mac_index < 0) ||
860 (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
861 (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
862 (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
e6a9854b 863 (tbl_type.ant_type != info->antenna_sel_tx) ||
5027309b
DH		 864 (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
865 (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
31513be8
DH		 866 (rs_index != mac_index)) {
867 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate);
95407aa4
DH		 868 /*
869 * Since rates mis-match, the last LQ command may have failed.
870 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
871 * ... driver.
d5e49036 872 */
7d049e5a
AM		 873 lq_sta->missed_rate_counter++;
874 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
875 lq_sta->missed_rate_counter = 0;
7e6a5886 876 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
7d049e5a 877 }
95407aa4
DH		 878 /* Regardless, ignore this status info for outdated rate */
879 return;
880 } else
881 /* Rate did match, so reset the missed_rate_counter */
882 lq_sta->missed_rate_counter = 0;
883
884 /* Figure out if rate scale algorithm is in active or search table */
885 if (table_type_matches(&tbl_type,
886 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
887 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
888 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
889 } else if (table_type_matches(&tbl_type,
890 &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
891 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
892 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
893 } else {
894 IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n");
80e9158c
WYG		 895 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
896 IWL_DEBUG_RATE(priv, "active- lq:%x, ant:%x, SGI:%d\n",
897 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
898 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
899 IWL_DEBUG_RATE(priv, "search- lq:%x, ant:%x, SGI:%d\n",
900 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
901 IWL_DEBUG_RATE(priv, "actual- lq:%x, ant:%x, SGI:%d\n",
902 tbl_type.lq_type, tbl_type.ant_type, tbl_type.is_SGI);
903 /*
904 * no matching table found, let's by-pass the data collection
905 * and continue to perform rate scale to find the rate table
906 */
da5dbb97 907 rs_stay_in_table(lq_sta, true);
80e9158c 908 goto done;
b481de9c
ZY		 909 }
910
95407aa4
DH		 911 /*
912 * Updating the frame history depends on whether packets were
913 * aggregated.
914 *
915 * For aggregation, all packets were transmitted at the same rate, the
916 * first index into rate scale table.
917 */
918 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
919 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
920 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
921 &rs_index);
04f2dec1 922 rs_collect_tx_data(curr_tbl, rs_index,
e3a3cd87
DH		 923 info->status.ampdu_len,
924 info->status.ampdu_ack_len);
95407aa4
DH		 925
926 /* Update success/fail counts if not searching for new mode */
927 if (lq_sta->stay_in_tbl) {
e3a3cd87
DH		 928 lq_sta->total_success += info->status.ampdu_ack_len;
929 lq_sta->total_failed += (info->status.ampdu_len -
930 info->status.ampdu_ack_len);
b481de9c 931 }
95407aa4 932 } else {
77626355 933 /*
95407aa4 934 * For legacy, update frame history with for each Tx retry.
77626355 935 */
95407aa4
DH		 936 retries = info->status.rates[0].count - 1;
937 /* HW doesn't send more than 15 retries */
938 retries = min(retries, 15);
939
940 /* The last transmission may have been successful */
941 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
942 /* Collect data for each rate used during failed TX attempts */
943 for (i = 0; i <= retries; ++i) {
944 tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
945 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
946 &tbl_type, &rs_index);
947 /*
948 * Only collect stats if retried rate is in the same RS
949 * table as active/search.
950 */
951 if (table_type_matches(&tbl_type, curr_tbl))
04f2dec1 952 tmp_tbl = curr_tbl;
95407aa4 953 else if (table_type_matches(&tbl_type, other_tbl))
04f2dec1 954 tmp_tbl = other_tbl;
95407aa4
DH		 955 else
956 continue;
04f2dec1
SZ		 957 rs_collect_tx_data(tmp_tbl, rs_index, 1,
958 i < retries ? 0 : legacy_success);
95407aa4
DH		 959 }
960
961 /* Update success/fail counts if not searching for new mode */
962 if (lq_sta->stay_in_tbl) {
963 lq_sta->total_success += legacy_success;
964 lq_sta->total_failed += retries + (1 - legacy_success);
99556438 965 }
b481de9c 966 }
95407aa4
DH		 967 /* The last TX rate is cached in lq_sta; it's set in if/else above */
968 lq_sta->last_rate_n_flags = tx_rate;
80e9158c 969done:
77626355 970 /* See if there's a better rate or modulation mode to try. */
c338ba3c 971 if (sta && sta->supp_rates[sband->band])
514d65c1 972 rs_rate_scale_perform(priv, skb, sta, lq_sta);
bee008b7
WYG		 973
974 /* Is there a need to switch between full concurrency and 3-wire? */
975 if (priv->bt_ant_couple_ok)
7e6a5886 976 rs_bt_update_lq(priv, ctx, lq_sta);
b481de9c
ZY		 977}
978
77626355
BC		 979/*
980 * Begin a period of staying with a selected modulation mode.
981 * Set "stay_in_tbl" flag to prevent any mode switches.
982 * Set frame tx success limits according to legacy vs. high-throughput,
983 * and reset overall (spanning all rates) tx success history statistics.
984 * These control how long we stay using same modulation mode before
985 * searching for a new mode.
986 */
bf403db8 987static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
e227ceac 988 struct iwl_lq_sta *lq_sta)
b481de9c 989{
e1623446 990 IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
c33104f0 991 lq_sta->stay_in_tbl = 1; /* only place this gets set */
b481de9c 992 if (is_legacy) {
c33104f0
TW		 993 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
994 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
995 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
b481de9c 996 } else {
c33104f0
TW		 997 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
998 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
999 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
b481de9c 1000 }
c33104f0
TW		 1001 lq_sta->table_count = 0;
1002 lq_sta->total_failed = 0;
1003 lq_sta->total_success = 0;
447fee70 1004 lq_sta->flush_timer = jiffies;
d6e93399 1005 lq_sta->action_counter = 0;
b481de9c
ZY		 1006}
1007
77626355
BC		 1008/*
1009 * Find correct throughput table for given mode of modulation
1010 */
e227ceac
TW		 1011static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1012 struct iwl_scale_tbl_info *tbl)
b481de9c 1013{
e3949d62
DH		 1014 /* Used to choose among HT tables */
1015 s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1016
1017 /* Check for invalid LQ type */
1018 if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1019 tbl->expected_tpt = expected_tpt_legacy;
1020 return;
1021 }
1022
1023 /* Legacy rates have only one table */
b481de9c 1024 if (is_legacy(tbl->lq_type)) {
e3949d62
DH		 1025 tbl->expected_tpt = expected_tpt_legacy;
1026 return;
1027 }
1028
1029 /* Choose among many HT tables depending on number of streams
1030 * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
1031 * status */
1032 if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1033 ht_tbl_pointer = expected_tpt_siso20MHz;
1034 else if (is_siso(tbl->lq_type))
1035 ht_tbl_pointer = expected_tpt_siso40MHz;
1036 else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1037 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1038 else if (is_mimo2(tbl->lq_type))
1039 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1040 else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1041 ht_tbl_pointer = expected_tpt_mimo3_20MHz;
1042 else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
1043 ht_tbl_pointer = expected_tpt_mimo3_40MHz;
1044
1045 if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */
1046 tbl->expected_tpt = ht_tbl_pointer[0];
1047 else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */
1048 tbl->expected_tpt = ht_tbl_pointer[1];
1049 else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */
1050 tbl->expected_tpt = ht_tbl_pointer[2];
1051 else /* AGG+SGI */
1052 tbl->expected_tpt = ht_tbl_pointer[3];
b481de9c
ZY		 1053}
1054
77626355
BC		 1055/*
1056 * Find starting rate for new "search" high-throughput mode of modulation.
1057 * Goal is to find lowest expected rate (under perfect conditions) that is
1058 * above the current measured throughput of "active" mode, to give new mode
1059 * a fair chance to prove itself without too many challenges.
1060 *
1061 * This gets called when transitioning to more aggressive modulation
1062 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1063 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1064 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1065 * bit rate will typically need to increase, but not if performance was bad.
1066 */
c79dd5b5 1067static s32 rs_get_best_rate(struct iwl_priv *priv,
e227ceac
TW		 1068 struct iwl_lq_sta *lq_sta,
1069 struct iwl_scale_tbl_info *tbl, /* "search" */
f935a6da 1070 u16 rate_mask, s8 index)
b481de9c 1071{
77626355 1072 /* "active" values */
e227ceac 1073 struct iwl_scale_tbl_info *active_tbl =
c33104f0 1074 &(lq_sta->lq_info[lq_sta->active_tbl]);
b481de9c 1075 s32 active_sr = active_tbl->win[index].success_ratio;
b481de9c 1076 s32 active_tpt = active_tbl->expected_tpt[index];
77626355
BC		 1077
1078 /* expected "search" throughput */
1079 s32 *tpt_tbl = tbl->expected_tpt;
1080
1081 s32 new_rate, high, low, start_hi;
b481de9c 1082 u16 high_low;
f935a6da 1083 s8 rate = index;
b481de9c
ZY		 1084
1085 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1086
1087 for (; ;) {
bf403db8
EK		 1088 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1089 tbl->lq_type);
b481de9c
ZY		 1090
1091 low = high_low & 0xff;
1092 high = (high_low >> 8) & 0xff;
1093
77626355
BC		 1094 /*
1095 * Lower the "search" bit rate, to give new "search" mode
1096 * approximately the same throughput as "active" if:
1097 *
1098 * 1) "Active" mode has been working modestly well (but not
1099 * great), and expected "search" throughput (under perfect
1100 * conditions) at candidate rate is above the actual
1101 * measured "active" throughput (but less than expected
1102 * "active" throughput under perfect conditions).
1103 * OR
1104 * 2) "Active" mode has been working perfectly or very well
1105 * and expected "search" throughput (under perfect
1106 * conditions) at candidate rate is above expected
1107 * "active" throughput (under perfect conditions).
1108 */
c33104f0 1109 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
b481de9c
ZY		 1110 ((active_sr > IWL_RATE_DECREASE_TH) &&
1111 (active_sr <= IWL_RATE_HIGH_TH) &&
1112 (tpt_tbl[rate] <= active_tpt))) ||
1113 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1114 (tpt_tbl[rate] > active_tpt))) {
1115
77626355
BC		 1116 /* (2nd or later pass)
1117 * If we've already tried to raise the rate, and are
1118 * now trying to lower it, use the higher rate. */
b481de9c
ZY		 1119 if (start_hi != IWL_RATE_INVALID) {
1120 new_rate = start_hi;
1121 break;
1122 }
77626355 1123
b481de9c 1124 new_rate = rate;
77626355
BC		 1125
1126 /* Loop again with lower rate */
b481de9c
ZY		 1127 if (low != IWL_RATE_INVALID)
1128 rate = low;
77626355
BC		 1129
1130 /* Lower rate not available, use the original */
b481de9c
ZY		 1131 else
1132 break;
77626355
BC		 1133
1134 /* Else try to raise the "search" rate to match "active" */
b481de9c 1135 } else {
77626355
BC		 1136 /* (2nd or later pass)
1137 * If we've already tried to lower the rate, and are
1138 * now trying to raise it, use the lower rate. */
b481de9c
ZY		 1139 if (new_rate != IWL_RATE_INVALID)
1140 break;
77626355
BC		 1141
1142 /* Loop again with higher rate */
b481de9c
ZY		 1143 else if (high != IWL_RATE_INVALID) {
1144 start_hi = high;
1145 rate = high;
77626355
BC		 1146
1147 /* Higher rate not available, use the original */
b481de9c 1148 } else {
90d7795e 1149 new_rate = rate;
b481de9c
ZY		 1150 break;
1151 }
1152 }
1153 }
1154
1155 return new_rate;
1156}
b481de9c 1157
77626355 1158/*
584a0f00 1159 * Set up search table for MIMO2
77626355 1160 */
fde0db31 1161static int rs_switch_to_mimo2(struct iwl_priv *priv,
e227ceac 1162 struct iwl_lq_sta *lq_sta,
270243a5 1163 struct ieee80211_conf *conf,
4b7679a5 1164 struct ieee80211_sta *sta,
e227ceac 1165 struct iwl_scale_tbl_info *tbl, int index)
b481de9c 1166{
b481de9c
ZY		 1167 u16 rate_mask;
1168 s32 rate;
c33104f0 1169 s8 is_green = lq_sta->is_green;
7e6a5886
JB		 1170 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1171 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
b481de9c 1172
de27e64e 1173 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
b481de9c
ZY		 1174 return -1;
1175
d9fe60de 1176 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
00c5ae2f 1177 == WLAN_HT_CAP_SM_PS_STATIC)
b481de9c
ZY		 1178 return -1;
1179
77626355 1180 /* Need both Tx chains/antennas to support MIMO */
aade00ce 1181 if (priv->hw_params.tx_chains_num < 2)
b481de9c
ZY		 1182 return -1;
1183
e1623446 1184 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
39e88504
GC		 1185
1186 tbl->lq_type = LQ_MIMO2;
c33104f0 1187 tbl->is_dup = lq_sta->is_dup;
b481de9c 1188 tbl->action = 0;
d6e93399 1189 tbl->max_search = IWL_MAX_SEARCH;
39e88504
GC		 1190 rate_mask = lq_sta->active_mimo2_rate;
1191
7e6a5886 1192 if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
7aafef1c 1193 tbl->is_ht40 = 1;
b481de9c 1194 else
7aafef1c 1195 tbl->is_ht40 = 0;
b481de9c 1196
eecd6e57 1197 rs_set_expected_tpt_table(lq_sta, tbl);
b481de9c 1198
f935a6da 1199 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
b481de9c 1200
e1623446 1201 IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
584a0f00
WYG		 1202 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1203 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1204 rate, rate_mask);
1205 return -1;
1206 }
1207 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1208
1209 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1210 tbl->current_rate, is_green);
1211 return 0;
1212}
1213
1214/*
1215 * Set up search table for MIMO3
1216 */
1217static int rs_switch_to_mimo3(struct iwl_priv *priv,
1218 struct iwl_lq_sta *lq_sta,
1219 struct ieee80211_conf *conf,
1220 struct ieee80211_sta *sta,
1221 struct iwl_scale_tbl_info *tbl, int index)
1222{
1223 u16 rate_mask;
1224 s32 rate;
1225 s8 is_green = lq_sta->is_green;
7e6a5886
JB		 1226 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1227 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
584a0f00
WYG		 1228
1229 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1230 return -1;
1231
1232 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1233 == WLAN_HT_CAP_SM_PS_STATIC)
1234 return -1;
1235
1236 /* Need both Tx chains/antennas to support MIMO */
1237 if (priv->hw_params.tx_chains_num < 3)
1238 return -1;
1239
1240 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1241
1242 tbl->lq_type = LQ_MIMO3;
1243 tbl->is_dup = lq_sta->is_dup;
1244 tbl->action = 0;
d6e93399 1245 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
584a0f00
WYG		 1246 rate_mask = lq_sta->active_mimo3_rate;
1247
7e6a5886 1248 if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
7aafef1c 1249 tbl->is_ht40 = 1;
584a0f00 1250 else
7aafef1c 1251 tbl->is_ht40 = 0;
39e88504 1252
584a0f00
WYG		 1253 rs_set_expected_tpt_table(lq_sta, tbl);
1254
1255 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1256
1257 IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1258 rate, rate_mask);
39e88504 1259 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
e1623446 1260 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
39e88504 1261 rate, rate_mask);
b481de9c 1262 return -1;
39e88504 1263 }
978785a3 1264 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
b481de9c 1265
e1623446 1266 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
39e88504 1267 tbl->current_rate, is_green);
dc2453ae 1268 return 0;
fde0db31 1269}
b481de9c 1270
77626355
BC		 1271/*
1272 * Set up search table for SISO
1273 */
c79dd5b5 1274static int rs_switch_to_siso(struct iwl_priv *priv,
e227ceac 1275 struct iwl_lq_sta *lq_sta,
270243a5 1276 struct ieee80211_conf *conf,
4b7679a5 1277 struct ieee80211_sta *sta,
e227ceac 1278 struct iwl_scale_tbl_info *tbl, int index)
b481de9c 1279{
b481de9c 1280 u16 rate_mask;
c33104f0 1281 u8 is_green = lq_sta->is_green;
b481de9c 1282 s32 rate;
7e6a5886
JB		 1283 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1284 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
b481de9c 1285
de27e64e 1286 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
b481de9c
ZY		 1287 return -1;
1288
e1623446 1289 IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
39e88504 1290
c33104f0 1291 tbl->is_dup = lq_sta->is_dup;
b481de9c
ZY		 1292 tbl->lq_type = LQ_SISO;
1293 tbl->action = 0;
d6e93399 1294 tbl->max_search = IWL_MAX_SEARCH;
39e88504 1295 rate_mask = lq_sta->active_siso_rate;
b481de9c 1296
7e6a5886 1297 if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
7aafef1c 1298 tbl->is_ht40 = 1;
b481de9c 1299 else
7aafef1c 1300 tbl->is_ht40 = 0;
b481de9c 1301
b481de9c 1302 if (is_green)
39e88504 1303 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
b481de9c 1304
eecd6e57 1305 rs_set_expected_tpt_table(lq_sta, tbl);
f935a6da 1306 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
b481de9c 1307
e1623446 1308 IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
b481de9c 1309 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
e1623446 1310 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
b481de9c
ZY		 1311 rate, rate_mask);
1312 return -1;
1313 }
978785a3 1314 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
e1623446 1315 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
39e88504 1316 tbl->current_rate, is_green);
403ab56b 1317 return 0;
b481de9c
ZY		 1318}
1319
77626355
BC		 1320/*
1321 * Try to switch to new modulation mode from legacy
1322 */
c79dd5b5 1323static int rs_move_legacy_other(struct iwl_priv *priv,
e227ceac 1324 struct iwl_lq_sta *lq_sta,
270243a5 1325 struct ieee80211_conf *conf,
4b7679a5 1326 struct ieee80211_sta *sta,
b481de9c
ZY		 1327 int index)
1328{
e227ceac
TW		 1329 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1330 struct iwl_scale_tbl_info *search_tbl =
1331 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1332 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1333 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1334 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
b1a78858 1335 u8 start_action;
fde0db31 1336 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
3110bef7 1337 u8 tx_chains_num = priv->hw_params.tx_chains_num;
fde0db31 1338 int ret = 0;
d6e93399 1339 u8 update_search_tbl_counter = 0;
b481de9c 1340
290f599c
JB		 1341 switch (priv->bt_traffic_load) {
1342 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1343 /* nothing */
1344 break;
1345 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1346 /* avoid antenna B unless MIMO */
da5dbb97 1347 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
290f599c
JB		 1348 if (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2)
1349 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1350 break;
1351 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1352 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1353 /* avoid antenna B and MIMO */
da5dbb97 1354 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
290f599c
JB		 1355 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2 &&
1356 tbl->action != IWL_LEGACY_SWITCH_SISO)
da5dbb97 1357 tbl->action = IWL_LEGACY_SWITCH_SISO;
290f599c
JB		 1358 break;
1359 default:
1360 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1361 break;
1362 }
1363
46f9381a
WYG		 1364 if (!iwl_ht_enabled(priv))
1365 /* stay in Legacy */
1366 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
3ad3b92a 1367 else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
46f9381a
WYG		 1368 tbl->action > IWL_LEGACY_SWITCH_SISO)
1369 tbl->action = IWL_LEGACY_SWITCH_SISO;
bee008b7
WYG		 1370
1371 /* configure as 1x1 if bt full concurrency */
1372 if (priv->bt_full_concurrent) {
1373 if (!iwl_ht_enabled(priv))
1374 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1375 else if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1376 tbl->action = IWL_LEGACY_SWITCH_SISO;
da5dbb97 1377 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
bee008b7
WYG		 1378 }
1379
b1a78858 1380 start_action = tbl->action;
b481de9c 1381 for (; ;) {
d6e93399 1382 lq_sta->action_counter++;
b481de9c 1383 switch (tbl->action) {
3110bef7
GC		 1384 case IWL_LEGACY_SWITCH_ANTENNA1:
1385 case IWL_LEGACY_SWITCH_ANTENNA2:
e1623446 1386 IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
b481de9c 1387
3110bef7
GC		 1388 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1389 tx_chains_num <= 1) ||
1390 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1391 tx_chains_num <= 2))
1392 break;
1393
77626355 1394 /* Don't change antenna if success has been great */
da5dbb97
WYG		 1395 if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1396 !priv->bt_full_concurrent &&
1397 priv->bt_traffic_load ==
1398 IWL_BT_COEX_TRAFFIC_LOAD_NONE)
b481de9c 1399 break;
77626355 1400
77626355 1401 /* Set up search table to try other antenna */
b481de9c
ZY		 1402 memcpy(search_tbl, tbl, sz);
1403
aade00ce
GC		 1404 if (rs_toggle_antenna(valid_tx_ant,
1405 &search_tbl->current_rate, search_tbl)) {
d6e93399 1406 update_search_tbl_counter = 1;
3110bef7 1407 rs_set_expected_tpt_table(lq_sta, search_tbl);
aade00ce
GC		 1408 goto out;
1409 }
a5e8b505 1410 break;
b481de9c 1411 case IWL_LEGACY_SWITCH_SISO:
e1623446 1412 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
77626355
BC		 1413
1414 /* Set up search table to try SISO */
b481de9c 1415 memcpy(search_tbl, tbl, sz);
b481de9c 1416 search_tbl->is_SGI = 0;
c33104f0 1417 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
270243a5 1418 search_tbl, index);
dc2453ae 1419 if (!ret) {
c33104f0 1420 lq_sta->action_counter = 0;
b481de9c 1421 goto out;
dc2453ae 1422 }
b481de9c
ZY		 1423
1424 break;
3110bef7
GC		 1425 case IWL_LEGACY_SWITCH_MIMO2_AB:
1426 case IWL_LEGACY_SWITCH_MIMO2_AC:
1427 case IWL_LEGACY_SWITCH_MIMO2_BC:
e1623446 1428 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
77626355
BC		 1429
1430 /* Set up search table to try MIMO */
b481de9c 1431 memcpy(search_tbl, tbl, sz);
b481de9c 1432 search_tbl->is_SGI = 0;
3110bef7
GC		 1433
1434 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1435 search_tbl->ant_type = ANT_AB;
1436 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1437 search_tbl->ant_type = ANT_AC;
1438 else
1439 search_tbl->ant_type = ANT_BC;
1440
1441 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1442 break;
1443
fde0db31 1444 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
270243a5 1445 search_tbl, index);
dc2453ae 1446 if (!ret) {
c33104f0 1447 lq_sta->action_counter = 0;
b481de9c 1448 goto out;
dc2453ae 1449 }
b481de9c 1450 break;
584a0f00
WYG		 1451
1452 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1453 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1454
1455 /* Set up search table to try MIMO3 */
1456 memcpy(search_tbl, tbl, sz);
1457 search_tbl->is_SGI = 0;
1458
1459 search_tbl->ant_type = ANT_ABC;
1460
1461 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1462 break;
1463
1464 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1465 search_tbl, index);
1466 if (!ret) {
1467 lq_sta->action_counter = 0;
1468 goto out;
1469 }
1470 break;
b481de9c
ZY		 1471 }
1472 tbl->action++;
584a0f00 1473 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
3110bef7 1474 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
b481de9c
ZY		 1475
1476 if (tbl->action == start_action)
1477 break;
1478
1479 }
3110bef7 1480 search_tbl->lq_type = LQ_NONE;
b481de9c
ZY		 1481 return 0;
1482
3110bef7
GC		 1483out:
1484 lq_sta->search_better_tbl = 1;
b481de9c 1485 tbl->action++;
584a0f00 1486 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
3110bef7 1487 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
d6e93399
MA		 1488 if (update_search_tbl_counter)
1489 search_tbl->action = tbl->action;
b481de9c
ZY		 1490 return 0;
1491
1492}
1493
77626355
BC		 1494/*
1495 * Try to switch to new modulation mode from SISO
1496 */
c79dd5b5 1497static int rs_move_siso_to_other(struct iwl_priv *priv,
e227ceac 1498 struct iwl_lq_sta *lq_sta,
270243a5 1499 struct ieee80211_conf *conf,
4b7679a5 1500 struct ieee80211_sta *sta, int index)
b481de9c 1501{
c33104f0 1502 u8 is_green = lq_sta->is_green;
e227ceac
TW		 1503 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1504 struct iwl_scale_tbl_info *search_tbl =
1505 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1506 struct iwl_rate_scale_data *window = &(tbl->win[index]);
28e6f489 1507 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
e227ceac
TW		 1508 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1509 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
b1a78858 1510 u8 start_action;
fde0db31 1511 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
3110bef7 1512 u8 tx_chains_num = priv->hw_params.tx_chains_num;
d6e93399 1513 u8 update_search_tbl_counter = 0;
fde0db31 1514 int ret;
b481de9c 1515
290f599c
JB		 1516 switch (priv->bt_traffic_load) {
1517 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1518 /* nothing */
1519 break;
1520 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1521 /* avoid antenna B unless MIMO */
da5dbb97 1522 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
290f599c
JB		 1523 if (tbl->action == IWL_SISO_SWITCH_ANTENNA2)
1524 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1525 break;
1526 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1527 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1528 /* avoid antenna B and MIMO */
da5dbb97
WYG		 1529 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1530 if (tbl->action != IWL_SISO_SWITCH_ANTENNA1)
290f599c
JB		 1531 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1532 break;
1533 default:
1534 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1535 break;
1536 }
1537
3ad3b92a 1538 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
46f9381a
WYG		 1539 tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1540 /* stay in SISO */
1541 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1542 }
bee008b7
WYG		 1543
1544 /* configure as 1x1 if bt full concurrency */
da5dbb97
WYG		 1545 if (priv->bt_full_concurrent) {
1546 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1547 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1548 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1549 }
bee008b7 1550
b1a78858 1551 start_action = tbl->action;
b481de9c 1552 for (;;) {
c33104f0 1553 lq_sta->action_counter++;
b481de9c 1554 switch (tbl->action) {
3110bef7
GC		 1555 case IWL_SISO_SWITCH_ANTENNA1:
1556 case IWL_SISO_SWITCH_ANTENNA2:
e1623446 1557 IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
3110bef7 1558 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
da5dbb97 1559 tx_chains_num <= 1) ||
3110bef7 1560 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
da5dbb97 1561 tx_chains_num <= 2))
3110bef7
GC		 1562 break;
1563
da5dbb97
WYG		 1564 if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1565 !priv->bt_full_concurrent &&
1566 priv->bt_traffic_load ==
1567 IWL_BT_COEX_TRAFFIC_LOAD_NONE)
b481de9c 1568 break;
b481de9c
ZY		 1569
1570 memcpy(search_tbl, tbl, sz);
aade00ce 1571 if (rs_toggle_antenna(valid_tx_ant,
d6e93399
MA		 1572 &search_tbl->current_rate, search_tbl)) {
1573 update_search_tbl_counter = 1;
aade00ce 1574 goto out;
d6e93399 1575 }
a5e8b505 1576 break;
3110bef7
GC		 1577 case IWL_SISO_SWITCH_MIMO2_AB:
1578 case IWL_SISO_SWITCH_MIMO2_AC:
1579 case IWL_SISO_SWITCH_MIMO2_BC:
e1623446 1580 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
b481de9c 1581 memcpy(search_tbl, tbl, sz);
b481de9c 1582 search_tbl->is_SGI = 0;
3110bef7
GC		 1583
1584 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1585 search_tbl->ant_type = ANT_AB;
1586 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1587 search_tbl->ant_type = ANT_AC;
1588 else
1589 search_tbl->ant_type = ANT_BC;
1590
1591 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1592 break;
1593
fde0db31 1594 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
270243a5 1595 search_tbl, index);
3110bef7 1596 if (!ret)
b481de9c
ZY		 1597 goto out;
1598 break;
1599 case IWL_SISO_SWITCH_GI:
28e6f489
DH		 1600 if (!tbl->is_ht40 && !(ht_cap->cap &
1601 IEEE80211_HT_CAP_SGI_20))
a9841013 1602 break;
28e6f489
DH		 1603 if (tbl->is_ht40 && !(ht_cap->cap &
1604 IEEE80211_HT_CAP_SGI_40))
a9841013
EG		 1605 break;
1606
e1623446 1607 IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
0c11b4de 1608
b481de9c 1609 memcpy(search_tbl, tbl, sz);
39e88504
GC		 1610 if (is_green) {
1611 if (!tbl->is_SGI)
1612 break;
1613 else
15b1687c
WT		 1614 IWL_ERR(priv,
1615 "SGI was set in GF+SISO\n");
b481de9c 1616 }
39e88504 1617 search_tbl->is_SGI = !tbl->is_SGI;
eecd6e57 1618 rs_set_expected_tpt_table(lq_sta, search_tbl);
39e88504
GC		 1619 if (tbl->is_SGI) {
1620 s32 tpt = lq_sta->last_tpt / 100;
1621 if (tpt >= search_tbl->expected_tpt[index])
1622 break;
1623 }
978785a3
TW		 1624 search_tbl->current_rate =
1625 rate_n_flags_from_tbl(priv, search_tbl,
1626 index, is_green);
d6e93399 1627 update_search_tbl_counter = 1;
b481de9c 1628 goto out;
584a0f00
WYG		 1629 case IWL_SISO_SWITCH_MIMO3_ABC:
1630 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1631 memcpy(search_tbl, tbl, sz);
1632 search_tbl->is_SGI = 0;
1633 search_tbl->ant_type = ANT_ABC;
1634
1635 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1636 break;
1637
1638 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1639 search_tbl, index);
1640 if (!ret)
1641 goto out;
1642 break;
b481de9c
ZY		 1643 }
1644 tbl->action++;
584a0f00 1645 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
3110bef7 1646 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
b481de9c
ZY		 1647
1648 if (tbl->action == start_action)
1649 break;
1650 }
3110bef7 1651 search_tbl->lq_type = LQ_NONE;
b481de9c
ZY		 1652 return 0;
1653
1654 out:
3110bef7 1655 lq_sta->search_better_tbl = 1;
b481de9c 1656 tbl->action++;
584a0f00 1657 if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
3110bef7 1658 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
d6e93399
MA		 1659 if (update_search_tbl_counter)
1660 search_tbl->action = tbl->action;
1661
b481de9c
ZY		 1662 return 0;
1663}
1664
77626355 1665/*
584a0f00 1666 * Try to switch to new modulation mode from MIMO2
77626355 1667 */
584a0f00 1668static int rs_move_mimo2_to_other(struct iwl_priv *priv,
e227ceac 1669 struct iwl_lq_sta *lq_sta,
270243a5 1670 struct ieee80211_conf *conf,
4b7679a5 1671 struct ieee80211_sta *sta, int index)
b481de9c 1672{
c33104f0 1673 s8 is_green = lq_sta->is_green;
e227ceac
TW		 1674 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1675 struct iwl_scale_tbl_info *search_tbl =
1676 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
3110bef7 1677 struct iwl_rate_scale_data *window = &(tbl->win[index]);
28e6f489 1678 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
e227ceac
TW		 1679 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1680 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
b1a78858 1681 u8 start_action;
3110bef7
GC		 1682 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1683 u8 tx_chains_num = priv->hw_params.tx_chains_num;
d6e93399 1684 u8 update_search_tbl_counter = 0;
aade00ce 1685 int ret;
b481de9c 1686
290f599c
JB		 1687 switch (priv->bt_traffic_load) {
1688 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1689 /* nothing */
1690 break;
1691 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1692 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1693 /* avoid antenna B and MIMO */
da5dbb97
WYG		 1694 if (tbl->action != IWL_MIMO2_SWITCH_SISO_A)
1695 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1696 break;
290f599c
JB		 1697 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1698 /* avoid antenna B unless MIMO */
da5dbb97
WYG		 1699 if (tbl->action == IWL_MIMO2_SWITCH_SISO_B ||
1700 tbl->action == IWL_MIMO2_SWITCH_SISO_C)
290f599c
JB		 1701 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1702 break;
1703 default:
1704 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1705 break;
1706 }
1707
3ad3b92a 1708 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
46f9381a
WYG		 1709 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1710 tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1711 /* switch in SISO */
1712 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1713 }
bee008b7
WYG		 1714
1715 /* configure as 1x1 if bt full concurrency */
1716 if (priv->bt_full_concurrent &&
1717 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1718 tbl->action > IWL_MIMO2_SWITCH_SISO_C))
1719 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1720
b1a78858 1721 start_action = tbl->action;
b481de9c 1722 for (;;) {
c33104f0 1723 lq_sta->action_counter++;
b481de9c 1724 switch (tbl->action) {
3110bef7
GC		 1725 case IWL_MIMO2_SWITCH_ANTENNA1:
1726 case IWL_MIMO2_SWITCH_ANTENNA2:
584a0f00 1727 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
3110bef7
GC		 1728
1729 if (tx_chains_num <= 2)
1730 break;
1731
1732 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1733 break;
1734
1735 memcpy(search_tbl, tbl, sz);
1736 if (rs_toggle_antenna(valid_tx_ant,
d6e93399
MA		 1737 &search_tbl->current_rate, search_tbl)) {
1738 update_search_tbl_counter = 1;
3110bef7 1739 goto out;
d6e93399 1740 }
3110bef7
GC		 1741 break;
1742 case IWL_MIMO2_SWITCH_SISO_A:
1743 case IWL_MIMO2_SWITCH_SISO_B:
1744 case IWL_MIMO2_SWITCH_SISO_C:
e1623446 1745 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
0c11b4de 1746
77626355 1747 /* Set up new search table for SISO */
b481de9c 1748 memcpy(search_tbl, tbl, sz);
39e88504 1749
3110bef7 1750 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
fde0db31 1751 search_tbl->ant_type = ANT_A;
3110bef7 1752 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
fde0db31 1753 search_tbl->ant_type = ANT_B;
3110bef7
GC		 1754 else
1755 search_tbl->ant_type = ANT_C;
1756
1757 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1758 break;
b481de9c 1759
c33104f0 1760 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
270243a5 1761 search_tbl, index);
3110bef7 1762 if (!ret)
b481de9c 1763 goto out;
3110bef7 1764
b481de9c
ZY		 1765 break;
1766
3110bef7 1767 case IWL_MIMO2_SWITCH_GI:
28e6f489
DH		 1768 if (!tbl->is_ht40 && !(ht_cap->cap &
1769 IEEE80211_HT_CAP_SGI_20))
a9841013 1770 break;
28e6f489
DH		 1771 if (tbl->is_ht40 && !(ht_cap->cap &
1772 IEEE80211_HT_CAP_SGI_40))
a9841013
EG		 1773 break;
1774
584a0f00 1775 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
77626355 1776
584a0f00 1777 /* Set up new search table for MIMO2 */
b481de9c 1778 memcpy(search_tbl, tbl, sz);
39e88504 1779 search_tbl->is_SGI = !tbl->is_SGI;
eecd6e57 1780 rs_set_expected_tpt_table(lq_sta, search_tbl);
77626355
BC		 1781 /*
1782 * If active table already uses the fastest possible
1783 * modulation (dual stream with short guard interval),
1784 * and it's working well, there's no need to look
1785 * for a better type of modulation!
1786 */
39e88504 1787 if (tbl->is_SGI) {
c33104f0 1788 s32 tpt = lq_sta->last_tpt / 100;
39e88504
GC		 1789 if (tpt >= search_tbl->expected_tpt[index])
1790 break;
b481de9c 1791 }
978785a3
TW		 1792 search_tbl->current_rate =
1793 rate_n_flags_from_tbl(priv, search_tbl,
1794 index, is_green);
d6e93399 1795 update_search_tbl_counter = 1;
b481de9c
ZY		 1796 goto out;
1797
584a0f00
WYG		 1798 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1799 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1800 memcpy(search_tbl, tbl, sz);
1801 search_tbl->is_SGI = 0;
1802 search_tbl->ant_type = ANT_ABC;
1803
1804 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1805 break;
1806
1807 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1808 search_tbl, index);
1809 if (!ret)
1810 goto out;
1811
1812 break;
b481de9c
ZY		 1813 }
1814 tbl->action++;
584a0f00 1815 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
3110bef7 1816 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
b481de9c
ZY		 1817
1818 if (tbl->action == start_action)
1819 break;
1820 }
3110bef7 1821 search_tbl->lq_type = LQ_NONE;
b481de9c
ZY		 1822 return 0;
1823 out:
3110bef7 1824 lq_sta->search_better_tbl = 1;
b481de9c 1825 tbl->action++;
584a0f00 1826 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
3110bef7 1827 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
d6e93399
MA		 1828 if (update_search_tbl_counter)
1829 search_tbl->action = tbl->action;
1830
b481de9c
ZY		 1831 return 0;
1832
1833}
1834
584a0f00
WYG		 1835/*
1836 * Try to switch to new modulation mode from MIMO3
1837 */
1838static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1839 struct iwl_lq_sta *lq_sta,
1840 struct ieee80211_conf *conf,
1841 struct ieee80211_sta *sta, int index)
1842{
1843 s8 is_green = lq_sta->is_green;
1844 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1845 struct iwl_scale_tbl_info *search_tbl =
1846 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1847 struct iwl_rate_scale_data *window = &(tbl->win[index]);
28e6f489 1848 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
584a0f00
WYG		 1849 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1850 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
b1a78858 1851 u8 start_action;
584a0f00
WYG		 1852 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1853 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1854 int ret;
d6e93399 1855 u8 update_search_tbl_counter = 0;
584a0f00 1856
290f599c
JB		 1857 switch (priv->bt_traffic_load) {
1858 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1859 /* nothing */
1860 break;
1861 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1862 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1863 /* avoid antenna B and MIMO */
da5dbb97 1864 if (tbl->action != IWL_MIMO3_SWITCH_SISO_A)
290f599c 1865 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
da5dbb97 1866 break;
290f599c
JB		 1867 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1868 /* avoid antenna B unless MIMO */
da5dbb97
WYG		 1869 if (tbl->action == IWL_MIMO3_SWITCH_SISO_B ||
1870 tbl->action == IWL_MIMO3_SWITCH_SISO_C)
290f599c 1871 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
290f599c
JB		 1872 break;
1873 default:
1874 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1875 break;
1876 }
1877
3ad3b92a 1878 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
46f9381a
WYG		 1879 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1880 tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1881 /* switch in SISO */
1882 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1883 }
bee008b7
WYG		 1884
1885 /* configure as 1x1 if bt full concurrency */
1886 if (priv->bt_full_concurrent &&
1887 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1888 tbl->action > IWL_MIMO3_SWITCH_SISO_C))
1889 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1890
b1a78858 1891 start_action = tbl->action;
584a0f00
WYG		 1892 for (;;) {
1893 lq_sta->action_counter++;
1894 switch (tbl->action) {
1895 case IWL_MIMO3_SWITCH_ANTENNA1:
1896 case IWL_MIMO3_SWITCH_ANTENNA2:
1897 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
1898
1899 if (tx_chains_num <= 3)
1900 break;
1901
1902 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1903 break;
1904
1905 memcpy(search_tbl, tbl, sz);
1906 if (rs_toggle_antenna(valid_tx_ant,
1907 &search_tbl->current_rate, search_tbl))
1908 goto out;
1909 break;
1910 case IWL_MIMO3_SWITCH_SISO_A:
1911 case IWL_MIMO3_SWITCH_SISO_B:
1912 case IWL_MIMO3_SWITCH_SISO_C:
1913 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
1914
1915 /* Set up new search table for SISO */
1916 memcpy(search_tbl, tbl, sz);
1917
1918 if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
1919 search_tbl->ant_type = ANT_A;
1920 else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
1921 search_tbl->ant_type = ANT_B;
1922 else
1923 search_tbl->ant_type = ANT_C;
1924
1925 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1926 break;
1927
1928 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1929 search_tbl, index);
1930 if (!ret)
1931 goto out;
1932
1933 break;
1934
1935 case IWL_MIMO3_SWITCH_MIMO2_AB:
1936 case IWL_MIMO3_SWITCH_MIMO2_AC:
1937 case IWL_MIMO3_SWITCH_MIMO2_BC:
1938 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
1939
1940 memcpy(search_tbl, tbl, sz);
1941 search_tbl->is_SGI = 0;
1942 if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
1943 search_tbl->ant_type = ANT_AB;
1944 else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
1945 search_tbl->ant_type = ANT_AC;
1946 else
1947 search_tbl->ant_type = ANT_BC;
1948
1949 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1950 break;
1951
1952 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1953 search_tbl, index);
1954 if (!ret)
1955 goto out;
1956
1957 break;
1958
1959 case IWL_MIMO3_SWITCH_GI:
28e6f489
DH		 1960 if (!tbl->is_ht40 && !(ht_cap->cap &
1961 IEEE80211_HT_CAP_SGI_20))
584a0f00 1962 break;
28e6f489
DH		 1963 if (tbl->is_ht40 && !(ht_cap->cap &
1964 IEEE80211_HT_CAP_SGI_40))
584a0f00
WYG		 1965 break;
1966
1967 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
1968
1969 /* Set up new search table for MIMO */
1970 memcpy(search_tbl, tbl, sz);
1971 search_tbl->is_SGI = !tbl->is_SGI;
1972 rs_set_expected_tpt_table(lq_sta, search_tbl);
1973 /*
1974 * If active table already uses the fastest possible
1975 * modulation (dual stream with short guard interval),
1976 * and it's working well, there's no need to look
1977 * for a better type of modulation!
1978 */
1979 if (tbl->is_SGI) {
1980 s32 tpt = lq_sta->last_tpt / 100;
1981 if (tpt >= search_tbl->expected_tpt[index])
1982 break;
1983 }
1984 search_tbl->current_rate =
1985 rate_n_flags_from_tbl(priv, search_tbl,
1986 index, is_green);
d6e93399 1987 update_search_tbl_counter = 1;
584a0f00
WYG		 1988 goto out;
1989 }
1990 tbl->action++;
1991 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1992 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1993
1994 if (tbl->action == start_action)
1995 break;
1996 }
1997 search_tbl->lq_type = LQ_NONE;
1998 return 0;
1999 out:
2000 lq_sta->search_better_tbl = 1;
2001 tbl->action++;
2002 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2003 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
d6e93399
MA		 2004 if (update_search_tbl_counter)
2005 search_tbl->action = tbl->action;
2006
584a0f00
WYG		 2007 return 0;
2008
2009}
2010
77626355
BC		 2011/*
2012 * Check whether we should continue using same modulation mode, or
2013 * begin search for a new mode, based on:
2014 * 1) # tx successes or failures while using this mode
2015 * 2) # times calling this function
2016 * 3) elapsed time in this mode (not used, for now)
2017 */
da5dbb97 2018static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
b481de9c 2019{
e227ceac 2020 struct iwl_scale_tbl_info *tbl;
b481de9c
ZY		 2021 int i;
2022 int active_tbl;
2023 int flush_interval_passed = 0;
bf403db8 2024 struct iwl_priv *priv;
b481de9c 2025
bf403db8 2026 priv = lq_sta->drv;
c33104f0 2027 active_tbl = lq_sta->active_tbl;
b481de9c 2028
c33104f0 2029 tbl = &(lq_sta->lq_info[active_tbl]);
b481de9c 2030
77626355 2031 /* If we've been disallowing search, see if we should now allow it */
c33104f0 2032 if (lq_sta->stay_in_tbl) {
b481de9c 2033
77626355 2034 /* Elapsed time using current modulation mode */
c33104f0 2035 if (lq_sta->flush_timer)
b481de9c 2036 flush_interval_passed =
447fee70
MA		 2037 time_after(jiffies,
2038 (unsigned long)(lq_sta->flush_timer +
b481de9c
ZY		 2039 IWL_RATE_SCALE_FLUSH_INTVL));
2040
77626355
BC		 2041 /*
2042 * Check if we should allow search for new modulation mode.
2043 * If many frames have failed or succeeded, or we've used
2044 * this same modulation for a long time, allow search, and
2045 * reset history stats that keep track of whether we should
2046 * allow a new search. Also (below) reset all bitmaps and
2047 * stats in active history.
2048 */
da5dbb97
WYG		 2049 if (force_search ||
2050 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
c33104f0
TW		 2051 (lq_sta->total_success > lq_sta->max_success_limit) ||
2052 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
b481de9c 2053 && (flush_interval_passed))) {
e1623446 2054 IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n:",
c33104f0
TW		 2055 lq_sta->total_failed,
2056 lq_sta->total_success,
b481de9c 2057 flush_interval_passed);
77626355
BC		 2058
2059 /* Allow search for new mode */
c33104f0
TW		 2060 lq_sta->stay_in_tbl = 0; /* only place reset */
2061 lq_sta->total_failed = 0;
2062 lq_sta->total_success = 0;
2063 lq_sta->flush_timer = 0;
77626355
BC		 2064
2065 /*
2066 * Else if we've used this modulation mode enough repetitions
2067 * (regardless of elapsed time or success/failure), reset
2068 * history bitmaps and rate-specific stats for all rates in
2069 * active table.
2070 */
403ab56b 2071 } else {
c33104f0
TW		 2072 lq_sta->table_count++;
2073 if (lq_sta->table_count >=
2074 lq_sta->table_count_limit) {
2075 lq_sta->table_count = 0;
b481de9c 2076
e1623446 2077 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
b481de9c
ZY		 2078 for (i = 0; i < IWL_RATE_COUNT; i++)
2079 rs_rate_scale_clear_window(
2080 &(tbl->win[i]));
2081 }
2082 }
2083
77626355
BC		 2084 /* If transitioning to allow "search", reset all history
2085 * bitmaps and stats in active table (this will become the new
2086 * "search" table). */
c33104f0 2087 if (!lq_sta->stay_in_tbl) {
b481de9c
ZY		 2088 for (i = 0; i < IWL_RATE_COUNT; i++)
2089 rs_rate_scale_clear_window(&(tbl->win[i]));
2090 }
2091 }
2092}
2093
e3139fe7
WYG		 2094/*
2095 * setup rate table in uCode
2096 * return rate_n_flags as used in the table
2097 */
2098static u32 rs_update_rate_tbl(struct iwl_priv *priv,
7e6a5886 2099 struct iwl_rxon_context *ctx,
e3139fe7
WYG		 2100 struct iwl_lq_sta *lq_sta,
2101 struct iwl_scale_tbl_info *tbl,
2102 int index, u8 is_green)
2103{
2104 u32 rate;
2105
2106 /* Update uCode's rate table. */
2107 rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2108 rs_fill_link_cmd(priv, lq_sta, rate);
7e6a5886 2109 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
e3139fe7
WYG		 2110
2111 return rate;
2112}
2113
77626355
BC		 2114/*
2115 * Do rate scaling and search for new modulation mode.
2116 */
c79dd5b5 2117static void rs_rate_scale_perform(struct iwl_priv *priv,
514d65c1 2118 struct sk_buff *skb,
4b7679a5
JB		 2119 struct ieee80211_sta *sta,
2120 struct iwl_lq_sta *lq_sta)
b481de9c 2121{
4b7679a5 2122 struct ieee80211_hw *hw = priv->hw;
270243a5 2123 struct ieee80211_conf *conf = &hw->conf;
514d65c1
GS		 2124 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2125 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
b481de9c
ZY		 2126 int low = IWL_RATE_INVALID;
2127 int high = IWL_RATE_INVALID;
2128 int index;
2129 int i;
e227ceac 2130 struct iwl_rate_scale_data *window = NULL;
b481de9c
ZY		 2131 int current_tpt = IWL_INVALID_VALUE;
2132 int low_tpt = IWL_INVALID_VALUE;
2133 int high_tpt = IWL_INVALID_VALUE;
2134 u32 fail_count;
2135 s8 scale_action = 0;
fd7c8a40 2136 u16 rate_mask;
b481de9c 2137 u8 update_lq = 0;
e227ceac 2138 struct iwl_scale_tbl_info *tbl, *tbl1;
b481de9c 2139 u16 rate_scale_index_msk = 0;
39e88504 2140 u32 rate;
b481de9c
ZY		 2141 u8 is_green = 0;
2142 u8 active_tbl = 0;
2143 u8 done_search = 0;
2144 u16 high_low;
a5e8b505 2145 s32 sr;
0c11b4de 2146 u8 tid = MAX_TID_COUNT;
86b4766b 2147 struct iwl_tid_data *tid_data;
7e6a5886
JB		 2148 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
2149 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
b481de9c 2150
e1623446 2151 IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
b481de9c 2152
514d65c1 2153 /* Send management frames and NO_ACK data using lowest rate. */
417f114b
TW		 2154 /* TODO: this could probably be improved.. */
2155 if (!ieee80211_is_data(hdr->frame_control) ||
514d65c1 2156 info->flags & IEEE80211_TX_CTL_NO_ACK)
b481de9c 2157 return;
b481de9c 2158
4b7679a5 2159 if (!sta || !lq_sta)
b481de9c
ZY		 2160 return;
2161
4b7679a5 2162 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
b481de9c 2163
faa29718 2164 tid = rs_tl_add_packet(lq_sta, hdr);
e3949d62
DH		 2165 if ((tid != MAX_TID_COUNT) && (lq_sta->tx_agg_tid_en & (1 << tid))) {
2166 tid_data = &priv->stations[lq_sta->lq.sta_id].tid[tid];
2167 if (tid_data->agg.state == IWL_AGG_OFF)
2168 lq_sta->is_agg = 0;
2169 else
2170 lq_sta->is_agg = 1;
2171 } else
2172 lq_sta->is_agg = 0;
faa29718 2173
77626355
BC		 2174 /*
2175 * Select rate-scale / modulation-mode table to work with in
2176 * the rest of this function: "search" if searching for better
2177 * modulation mode, or "active" if doing rate scaling within a mode.
2178 */
c33104f0
TW		 2179 if (!lq_sta->search_better_tbl)
2180 active_tbl = lq_sta->active_tbl;
b481de9c 2181 else
c33104f0 2182 active_tbl = 1 - lq_sta->active_tbl;
b481de9c 2183
c33104f0 2184 tbl = &(lq_sta->lq_info[active_tbl]);
2681b20b
WYG		 2185 if (is_legacy(tbl->lq_type))
2186 lq_sta->is_green = 0;
2187 else
7e6a5886 2188 lq_sta->is_green = rs_use_green(sta);
c33104f0 2189 is_green = lq_sta->is_green;
b481de9c 2190
77626355 2191 /* current tx rate */
b7e35008 2192 index = lq_sta->last_txrate_idx;
b481de9c 2193
e1623446 2194 IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
b481de9c
ZY		 2195 tbl->lq_type);
2196
77626355 2197 /* rates available for this association, and for modulation mode */
eecd6e57 2198 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
b481de9c 2199
91dd6c27 2200 IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
b481de9c
ZY		 2201
2202 /* mask with station rate restriction */
2203 if (is_legacy(tbl->lq_type)) {
8318d78a 2204 if (lq_sta->band == IEEE80211_BAND_5GHZ)
77626355 2205 /* supp_rates has no CCK bits in A mode */
b481de9c 2206 rate_scale_index_msk = (u16) (rate_mask &
c33104f0 2207 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
b481de9c
ZY		 2208 else
2209 rate_scale_index_msk = (u16) (rate_mask &
c33104f0 2210 lq_sta->supp_rates);
b481de9c
ZY		 2211
2212 } else
2213 rate_scale_index_msk = rate_mask;
2214
2215 if (!rate_scale_index_msk)
2216 rate_scale_index_msk = rate_mask;
2217
07bc28ed 2218 if (!((1 << index) & rate_scale_index_msk)) {
15b1687c 2219 IWL_ERR(priv, "Current Rate is not valid\n");
e3139fe7
WYG		 2220 if (lq_sta->search_better_tbl) {
2221 /* revert to active table if search table is not valid*/
2222 tbl->lq_type = LQ_NONE;
2223 lq_sta->search_better_tbl = 0;
2224 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2225 /* get "active" rate info */
2226 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
7e6a5886 2227 rate = rs_update_rate_tbl(priv, ctx, lq_sta,
e3139fe7
WYG		 2228 tbl, index, is_green);
2229 }
07bc28ed 2230 return;
b481de9c
ZY		 2231 }
2232
77626355 2233 /* Get expected throughput table and history window for current rate */
07bc28ed 2234 if (!tbl->expected_tpt) {
15b1687c 2235 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
07bc28ed
GC		 2236 return;
2237 }
b481de9c 2238
c6ec7a9b
AM		 2239 /* force user max rate if set by user */
2240 if ((lq_sta->max_rate_idx != -1) &&
2241 (lq_sta->max_rate_idx < index)) {
2242 index = lq_sta->max_rate_idx;
2243 update_lq = 1;
2244 window = &(tbl->win[index]);
2245 goto lq_update;
2246 }
2247
b481de9c
ZY		 2248 window = &(tbl->win[index]);
2249
77626355
BC		 2250 /*
2251 * If there is not enough history to calculate actual average
2252 * throughput, keep analyzing results of more tx frames, without
2253 * changing rate or mode (bypass most of the rest of this function).
2254 * Set up new rate table in uCode only if old rate is not supported
2255 * in current association (use new rate found above).
2256 */
b481de9c 2257 fail_count = window->counter - window->success_counter;
07bc28ed
GC		 2258 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2259 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
e1623446 2260 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
b481de9c
ZY		 2261 "for index %d\n",
2262 window->success_counter, window->counter, index);
77626355
BC		 2263
2264 /* Can't calculate this yet; not enough history */
b481de9c 2265 window->average_tpt = IWL_INVALID_VALUE;
77626355
BC		 2266
2267 /* Should we stay with this modulation mode,
2268 * or search for a new one? */
da5dbb97 2269 rs_stay_in_table(lq_sta, false);
77626355 2270
b481de9c 2271 goto out;
3110bef7 2272 }
77626355
BC		 2273 /* Else we have enough samples; calculate estimate of
2274 * actual average throughput */
3d79b2a9
RC		 2275 if (window->average_tpt != ((window->success_ratio *
2276 tbl->expected_tpt[index] + 64) / 128)) {
2277 IWL_ERR(priv, "expected_tpt should have been calculated by now\n");
2278 window->average_tpt = ((window->success_ratio *
2279 tbl->expected_tpt[index] + 64) / 128);
2280 }
b481de9c 2281
77626355 2282 /* If we are searching for better modulation mode, check success. */
46f9381a 2283 if (lq_sta->search_better_tbl &&
3ad3b92a 2284 (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
77626355
BC		 2285 /* If good success, continue using the "search" mode;
2286 * no need to send new link quality command, since we're
2287 * continuing to use the setup that we've been trying. */
07bc28ed
GC		 2288 if (window->average_tpt > lq_sta->last_tpt) {
2289
e1623446 2290 IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
07bc28ed
GC		 2291 "suc=%d cur-tpt=%d old-tpt=%d\n",
2292 window->success_ratio,
2293 window->average_tpt,
2294 lq_sta->last_tpt);
2295
2296 if (!is_legacy(tbl->lq_type))
c33104f0 2297 lq_sta->enable_counter = 1;
07bc28ed 2298
77626355 2299 /* Swap tables; "search" becomes "active" */
c33104f0 2300 lq_sta->active_tbl = active_tbl;
b481de9c 2301 current_tpt = window->average_tpt;
77626355
BC		 2302
2303 /* Else poor success; go back to mode in "active" table */
b481de9c 2304 } else {
07bc28ed 2305
e1623446 2306 IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
07bc28ed
GC		 2307 "suc=%d cur-tpt=%d old-tpt=%d\n",
2308 window->success_ratio,
2309 window->average_tpt,
2310 lq_sta->last_tpt);
2311
77626355 2312 /* Nullify "search" table */
b481de9c 2313 tbl->lq_type = LQ_NONE;
77626355
BC		 2314
2315 /* Revert to "active" table */
c33104f0
TW		 2316 active_tbl = lq_sta->active_tbl;
2317 tbl = &(lq_sta->lq_info[active_tbl]);
b481de9c 2318
77626355 2319 /* Revert to "active" rate and throughput info */
e7d326ac 2320 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
c33104f0 2321 current_tpt = lq_sta->last_tpt;
b481de9c 2322
77626355 2323 /* Need to set up a new rate table in uCode */
b481de9c 2324 update_lq = 1;
b481de9c 2325 }
77626355
BC		 2326
2327 /* Either way, we've made a decision; modulation mode
2328 * search is done, allow rate adjustment next time. */
c33104f0 2329 lq_sta->search_better_tbl = 0;
77626355 2330 done_search = 1; /* Don't switch modes below! */
b481de9c
ZY		 2331 goto lq_update;
2332 }
2333
77626355
BC		 2334 /* (Else) not in search of better modulation mode, try for better
2335 * starting rate, while staying in this mode. */
bf403db8 2336 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
b481de9c
ZY		 2337 tbl->lq_type);
2338 low = high_low & 0xff;
2339 high = (high_low >> 8) & 0xff;
2340
c6ec7a9b
AM		 2341 /* If user set max rate, dont allow higher than user constrain */
2342 if ((lq_sta->max_rate_idx != -1) &&
2343 (lq_sta->max_rate_idx < high))
2344 high = IWL_RATE_INVALID;
2345
a5e8b505
GC		 2346 sr = window->success_ratio;
2347
77626355 2348 /* Collect measured throughputs for current and adjacent rates */
b481de9c 2349 current_tpt = window->average_tpt;
b481de9c
ZY		 2350 if (low != IWL_RATE_INVALID)
2351 low_tpt = tbl->win[low].average_tpt;
b481de9c
ZY		 2352 if (high != IWL_RATE_INVALID)
2353 high_tpt = tbl->win[high].average_tpt;
2354
a5e8b505 2355 scale_action = 0;
b481de9c 2356
77626355 2357 /* Too many failures, decrease rate */
a5e8b505 2358 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
e1623446 2359 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
b481de9c 2360 scale_action = -1;
77626355
BC		 2361
2362 /* No throughput measured yet for adjacent rates; try increase. */
b481de9c 2363 } else if ((low_tpt == IWL_INVALID_VALUE) &&
a5e8b505
GC		 2364 (high_tpt == IWL_INVALID_VALUE)) {
2365
2366 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2367 scale_action = 1;
2368 else if (low != IWL_RATE_INVALID)
8fe72311 2369 scale_action = 0;
a5e8b505 2370 }
77626355
BC		 2371
2372 /* Both adjacent throughputs are measured, but neither one has better
2373 * throughput; we're using the best rate, don't change it! */
b481de9c
ZY		 2374 else if ((low_tpt != IWL_INVALID_VALUE) &&
2375 (high_tpt != IWL_INVALID_VALUE) &&
2376 (low_tpt < current_tpt) &&
2377 (high_tpt < current_tpt))
2378 scale_action = 0;
77626355
BC		 2379
2380 /* At least one adjacent rate's throughput is measured,
2381 * and may have better performance. */
b481de9c 2382 else {
77626355 2383 /* Higher adjacent rate's throughput is measured */
b481de9c 2384 if (high_tpt != IWL_INVALID_VALUE) {
77626355 2385 /* Higher rate has better throughput */
a5e8b505
GC		 2386 if (high_tpt > current_tpt &&
2387 sr >= IWL_RATE_INCREASE_TH) {
b481de9c 2388 scale_action = 1;
a5e8b505 2389 } else {
8fe72311 2390 scale_action = 0;
b481de9c 2391 }
77626355
BC		 2392
2393 /* Lower adjacent rate's throughput is measured */
b481de9c 2394 } else if (low_tpt != IWL_INVALID_VALUE) {
77626355 2395 /* Lower rate has better throughput */
b481de9c 2396 if (low_tpt > current_tpt) {
e1623446
TW		 2397 IWL_DEBUG_RATE(priv,
2398 "decrease rate because of low tpt\n");
b481de9c 2399 scale_action = -1;
a5e8b505 2400 } else if (sr >= IWL_RATE_INCREASE_TH) {
b481de9c 2401 scale_action = 1;
a5e8b505 2402 }
b481de9c
ZY		 2403 }
2404 }
2405
77626355
BC		 2406 /* Sanity check; asked for decrease, but success rate or throughput
2407 * has been good at old rate. Don't change it. */
a5e8b505
GC		 2408 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2409 ((sr > IWL_RATE_HIGH_TH) ||
b481de9c 2410 (current_tpt > (100 * tbl->expected_tpt[low]))))
b481de9c 2411 scale_action = 0;
46f9381a
WYG		 2412 if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2413 scale_action = -1;
3ad3b92a 2414 if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
46f9381a
WYG		 2415 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2416 scale_action = -1;
290f599c 2417
da5dbb97
WYG		 2418 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2419 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2420 if (lq_sta->last_bt_traffic > priv->bt_traffic_load) {
2421 /*
2422 * don't set scale_action, don't want to scale up if
2423 * the rate scale doesn't otherwise think that is a
2424 * good idea.
2425 */
2426 } else if (lq_sta->last_bt_traffic <= priv->bt_traffic_load) {
2427 scale_action = -1;
2428 }
2429 }
2430 lq_sta->last_bt_traffic = priv->bt_traffic_load;
2431
2432 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2433 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2434 /* search for a new modulation */
2435 rs_stay_in_table(lq_sta, true);
2436 goto lq_update;
290f599c
JB		 2437 }
2438
b481de9c
ZY		 2439 switch (scale_action) {
2440 case -1:
77626355 2441 /* Decrease starting rate, update uCode's rate table */
b481de9c
ZY		 2442 if (low != IWL_RATE_INVALID) {
2443 update_lq = 1;
2444 index = low;
2445 }
447fee70 2446
b481de9c
ZY		 2447 break;
2448 case 1:
77626355 2449 /* Increase starting rate, update uCode's rate table */
b481de9c
ZY		 2450 if (high != IWL_RATE_INVALID) {
2451 update_lq = 1;
2452 index = high;
2453 }
2454
2455 break;
2456 case 0:
77626355 2457 /* No change */
b481de9c
ZY		 2458 default:
2459 break;
2460 }
2461
e1623446 2462 IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
b481de9c
ZY		 2463 "high %d type %d\n",
2464 index, scale_action, low, high, tbl->lq_type);
2465
a5e8b505 2466lq_update:
77626355 2467 /* Replace uCode's rate table for the destination station. */
e3139fe7 2468 if (update_lq)
7e6a5886 2469 rate = rs_update_rate_tbl(priv, ctx, lq_sta,
e3139fe7 2470 tbl, index, is_green);
77626355 2471
3ad3b92a 2472 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
46f9381a
WYG		 2473 /* Should we stay with this modulation mode,
2474 * or search for a new one? */
da5dbb97 2475 rs_stay_in_table(lq_sta, false);
46f9381a 2476 }
77626355
BC		 2477 /*
2478 * Search for new modulation mode if we're:
2479 * 1) Not changing rates right now
2480 * 2) Not just finishing up a search
2481 * 3) Allowing a new search
2482 */
47cfd463 2483 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
77626355 2484 /* Save current throughput to compare with "search" throughput*/
c33104f0 2485 lq_sta->last_tpt = current_tpt;
b481de9c 2486
77626355
BC		 2487 /* Select a new "search" modulation mode to try.
2488 * If one is found, set up the new "search" table. */
b481de9c 2489 if (is_legacy(tbl->lq_type))
c33104f0 2490 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
b481de9c 2491 else if (is_siso(tbl->lq_type))
c33104f0 2492 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
584a0f00
WYG		 2493 else if (is_mimo2(tbl->lq_type))
2494 rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
b481de9c 2495 else
584a0f00 2496 rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
b481de9c 2497
77626355 2498 /* If new "search" mode was selected, set up in uCode table */
c33104f0 2499 if (lq_sta->search_better_tbl) {
77626355 2500 /* Access the "search" table, clear its history. */
c33104f0 2501 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
b481de9c
ZY		 2502 for (i = 0; i < IWL_RATE_COUNT; i++)
2503 rs_rate_scale_clear_window(&(tbl->win[i]));
2504
77626355 2505 /* Use new "search" start rate */
e7d326ac 2506 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
b481de9c 2507
e1623446 2508 IWL_DEBUG_RATE(priv, "Switch current mcs: %X index: %d\n",
39e88504 2509 tbl->current_rate, index);
07bc28ed 2510 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
7e6a5886 2511 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
447fee70
MA		 2512 } else
2513 done_search = 1;
2514 }
b481de9c 2515
447fee70 2516 if (done_search && !lq_sta->stay_in_tbl) {
77626355
BC		 2517 /* If the "active" (non-search) mode was legacy,
2518 * and we've tried switching antennas,
2519 * but we haven't been able to try HT modes (not available),
2520 * stay with best antenna legacy modulation for a while
2521 * before next round of mode comparisons. */
c33104f0 2522 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
de27e64e 2523 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
d6e93399 2524 lq_sta->action_counter > tbl1->max_search) {
e1623446 2525 IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
bf403db8 2526 rs_set_stay_in_table(priv, 1, lq_sta);
b481de9c
ZY		 2527 }
2528
77626355
BC		 2529 /* If we're in an HT mode, and all 3 mode switch actions
2530 * have been tried and compared, stay in this best modulation
2531 * mode for a while before next round of mode comparisons. */
c33104f0 2532 if (lq_sta->enable_counter &&
46f9381a
WYG		 2533 (lq_sta->action_counter >= tbl1->max_search) &&
2534 iwl_ht_enabled(priv)) {
0c11b4de
RR		 2535 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2536 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2537 (tid != MAX_TID_COUNT)) {
86b4766b
WYG		 2538 tid_data =
2539 &priv->stations[lq_sta->lq.sta_id].tid[tid];
2540 if (tid_data->agg.state == IWL_AGG_OFF) {
2541 IWL_DEBUG_RATE(priv,
2542 "try to aggregate tid %d\n",
2543 tid);
2544 rs_tl_turn_on_agg(priv, tid,
2545 lq_sta, sta);
2546 }
b481de9c 2547 }
bf403db8 2548 rs_set_stay_in_table(priv, 0, lq_sta);
b481de9c 2549 }
b481de9c
ZY		 2550 }
2551
2552out:
978785a3 2553 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
b481de9c 2554 i = index;
b7e35008 2555 lq_sta->last_txrate_idx = i;
b481de9c
ZY		 2556}
2557
fe6b23dd
RC		 2558/**
2559 * rs_initialize_lq - Initialize a station's hardware rate table
2560 *
2561 * The uCode's station table contains a table of fallback rates
2562 * for automatic fallback during transmission.
2563 *
2564 * NOTE: This sets up a default set of values. These will be replaced later
2565 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2566 * rc80211_simple.
2567 *
2568 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2569 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2570 * which requires station table entry to exist).
2571 */
c79dd5b5 2572static void rs_initialize_lq(struct iwl_priv *priv,
270243a5 2573 struct ieee80211_conf *conf,
4b7679a5
JB		 2574 struct ieee80211_sta *sta,
2575 struct iwl_lq_sta *lq_sta)
b481de9c 2576{
e227ceac 2577 struct iwl_scale_tbl_info *tbl;
b481de9c 2578 int rate_idx;
aade00ce 2579 int i;
39e88504 2580 u32 rate;
7e6a5886 2581 u8 use_green = rs_use_green(sta);
aade00ce
GC		 2582 u8 active_tbl = 0;
2583 u8 valid_tx_ant;
7e6a5886
JB		 2584 struct iwl_station_priv *sta_priv;
2585 struct iwl_rxon_context *ctx;
b481de9c 2586
4b7679a5 2587 if (!sta || !lq_sta)
7e6a5886
JB		 2588 return;
2589
2590 sta_priv = (void *)sta->drv_priv;
2591 ctx = sta_priv->common.ctx;
b481de9c 2592
b7e35008 2593 i = lq_sta->last_txrate_idx;
b481de9c 2594
aade00ce
GC		 2595 valid_tx_ant = priv->hw_params.valid_tx_ant;
2596
c33104f0
TW		 2597 if (!lq_sta->search_better_tbl)
2598 active_tbl = lq_sta->active_tbl;
b481de9c 2599 else
c33104f0 2600 active_tbl = 1 - lq_sta->active_tbl;
b481de9c 2601
c33104f0 2602 tbl = &(lq_sta->lq_info[active_tbl]);
b481de9c
ZY		 2603
2604 if ((i < 0) || (i >= IWL_RATE_COUNT))
2605 i = 0;
2606
1826dcc0 2607 rate = iwl_rates[i].plcp;
eb48dcaf
WT		 2608 tbl->ant_type = first_antenna(valid_tx_ant);
2609 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
b481de9c
ZY		 2610
2611 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
39e88504 2612 rate |= RATE_MCS_CCK_MSK;
b481de9c 2613
39e88504 2614 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
aade00ce
GC		 2615 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2616 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
b481de9c 2617
978785a3 2618 rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
39e88504 2619 tbl->current_rate = rate;
eecd6e57 2620 rs_set_expected_tpt_table(lq_sta, tbl);
07bc28ed 2621 rs_fill_link_cmd(NULL, lq_sta, rate);
fe6b23dd 2622 priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
7e6a5886 2623 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_SYNC, true);
b481de9c
ZY		 2624}
2625
e6a9854b
JB		 2626static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2627 struct ieee80211_tx_rate_control *txrc)
b481de9c
ZY		 2628{
2629
e6a9854b
JB		 2630 struct sk_buff *skb = txrc->skb;
2631 struct ieee80211_supported_band *sband = txrc->sband;
f875f518 2632 struct iwl_priv *priv __maybe_unused = (struct iwl_priv *)priv_r;
e6a9854b 2633 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
417f114b
TW		 2634 struct iwl_lq_sta *lq_sta = priv_sta;
2635 int rate_idx;
b481de9c 2636
e1623446 2637 IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
b481de9c 2638
c6ec7a9b
AM		 2639 /* Get max rate if user set max rate */
2640 if (lq_sta) {
2641 lq_sta->max_rate_idx = txrc->max_rate_idx;
2642 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2643 (lq_sta->max_rate_idx != -1))
2644 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2645 if ((lq_sta->max_rate_idx < 0) ||
2646 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2647 lq_sta->max_rate_idx = -1;
2648 }
2649
fe6b23dd
RC		 2650 /* Treat uninitialized rate scaling data same as non-existing. */
2651 if (lq_sta && !lq_sta->drv) {
2652 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
2653 priv_sta = NULL;
2654 }
2655
514d65c1 2656 /* Send management frames and NO_ACK data using lowest rate. */
4c6d4f5c 2657 if (rate_control_send_low(sta, priv_sta, txrc))
4b7679a5 2658 return;
b481de9c 2659
417f114b 2660 rate_idx = lq_sta->last_txrate_idx;
b481de9c 2661
a9c146b3 2662 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
417f114b 2663 rate_idx -= IWL_FIRST_OFDM_RATE;
a9c146b3
WYG		 2664 /* 6M and 9M shared same MCS index */
2665 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2666 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2667 IWL_RATE_MIMO3_6M_PLCP)
2668 rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2669 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2670 IWL_RATE_MIMO2_6M_PLCP)
2671 rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2672 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2673 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2674 info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2675 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2676 info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
7aafef1c 2677 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
a9c146b3
WYG		 2678 info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2679 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2680 info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2681 } else {
5027309b
DH		 2682 /* Check for invalid rates */
2683 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2684 ((sband->band == IEEE80211_BAND_5GHZ) &&
2685 (rate_idx < IWL_FIRST_OFDM_RATE)))
a9c146b3 2686 rate_idx = rate_lowest_index(sband, sta);
5027309b 2687 /* On valid 5 GHz rate, adjust index */
a9c146b3
WYG		 2688 else if (sband->band == IEEE80211_BAND_5GHZ)
2689 rate_idx -= IWL_FIRST_OFDM_RATE;
7ebaeff8 2690 info->control.rates[0].flags = 0;
a9c146b3 2691 }
417f114b 2692 info->control.rates[0].idx = rate_idx;
a9c146b3 2693
b481de9c
ZY		 2694}
2695
4b7679a5
JB		 2696static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2697 gfp_t gfp)
b481de9c 2698{
e227ceac 2699 struct iwl_lq_sta *lq_sta;
8d9698b3 2700 struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv;
bf403db8 2701 struct iwl_priv *priv;
b481de9c 2702
bf403db8 2703 priv = (struct iwl_priv *)priv_rate;
e1623446 2704 IWL_DEBUG_RATE(priv, "create station rate scale window\n");
b481de9c 2705
8d9698b3 2706 lq_sta = &sta_priv->lq_sta;
b481de9c 2707
c33104f0 2708 return lq_sta;
b481de9c
ZY		 2709}
2710
fe6b23dd
RC		 2711/*
2712 * Called after adding a new station to initialize rate scaling
2713 */
2714void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id)
b481de9c
ZY		 2715{
2716 int i, j;
fe6b23dd 2717 struct ieee80211_hw *hw = priv->hw;
4b7679a5 2718 struct ieee80211_conf *conf = &priv->hw->conf;
7869b0ea 2719 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
fe6b23dd
RC		 2720 struct iwl_station_priv *sta_priv;
2721 struct iwl_lq_sta *lq_sta;
2722 struct ieee80211_supported_band *sband;
2723
2724 sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2725 lq_sta = &sta_priv->lq_sta;
2726 sband = hw->wiphy->bands[conf->channel->band];
b481de9c 2727
fe6b23dd
RC		 2728
2729 lq_sta->lq.sta_id = sta_id;
5ad13f8c
RC		 2730
2731 for (j = 0; j < LQ_SIZE; j++)
2732 for (i = 0; i < IWL_RATE_COUNT; i++)
2733 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2734
c33104f0 2735 lq_sta->flush_timer = 0;
4b7679a5 2736 lq_sta->supp_rates = sta->supp_rates[sband->band];
b481de9c
ZY		 2737 for (j = 0; j < LQ_SIZE; j++)
2738 for (i = 0; i < IWL_RATE_COUNT; i++)
3ac7f146 2739 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
b481de9c 2740
fe6b23dd
RC		 2741 IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n",
2742 sta_id);
b481de9c
ZY		 2743 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2744 * the lowest or the highest rate.. Could consider using RSSI from
2745 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2746 * after assoc.. */
2747
c33104f0 2748 lq_sta->is_dup = 0;
c6ec7a9b 2749 lq_sta->max_rate_idx = -1;
7d049e5a 2750 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
7e6a5886 2751 lq_sta->is_green = rs_use_green(sta);
39e88504 2752 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
8318d78a 2753 lq_sta->band = priv->band;
77626355
BC		 2754 /*
2755 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2756 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2757 */
7869b0ea
DH		 2758 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2759 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
c33104f0 2760 lq_sta->active_siso_rate &= ~((u16)0x2);
fde0db31 2761 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
b481de9c 2762
77626355 2763 /* Same here */
7869b0ea
DH		 2764 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2765 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
fde0db31
GC		 2766 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2767 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2768
7869b0ea
DH		 2769 lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2770 lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
fde0db31
GC		 2771 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2772 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2773
e1623446 2774 IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
c33104f0 2775 lq_sta->active_siso_rate,
fde0db31
GC		 2776 lq_sta->active_mimo2_rate,
2777 lq_sta->active_mimo3_rate);
2778
a96a27f9 2779 /* These values will be overridden later */
3a23d695
WYG		 2780 lq_sta->lq.general_params.single_stream_ant_msk =
2781 first_antenna(priv->hw_params.valid_tx_ant);
2782 lq_sta->lq.general_params.dual_stream_ant_msk =
2783 priv->hw_params.valid_tx_ant &
2784 ~first_antenna(priv->hw_params.valid_tx_ant);
2785 if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2786 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2787 } else if (num_of_ant(priv->hw_params.valid_tx_ant) == 2) {
2788 lq_sta->lq.general_params.dual_stream_ant_msk =
2789 priv->hw_params.valid_tx_ant;
2790 }
07bc28ed 2791
0c11b4de
RR		 2792 /* as default allow aggregation for all tids */
2793 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
c33104f0 2794 lq_sta->drv = priv;
b481de9c 2795
5027309b
DH		 2796 /* Set last_txrate_idx to lowest rate */
2797 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2798 if (sband->band == IEEE80211_BAND_5GHZ)
2799 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
e3949d62 2800 lq_sta->is_agg = 0;
d5e49036 2801
4b7679a5 2802 rs_initialize_lq(priv, conf, sta, lq_sta);
b481de9c
ZY		 2803}
2804
46f9381a 2805static void rs_fill_link_cmd(struct iwl_priv *priv,
e227ceac 2806 struct iwl_lq_sta *lq_sta, u32 new_rate)
b481de9c 2807{
e227ceac 2808 struct iwl_scale_tbl_info tbl_type;
b481de9c 2809 int index = 0;
b481de9c 2810 int rate_idx;
1b696de2 2811 int repeat_rate = 0;
aade00ce 2812 u8 ant_toggle_cnt = 0;
b481de9c 2813 u8 use_ht_possible = 1;
aade00ce 2814 u8 valid_tx_ant = 0;
07bc28ed 2815 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
b481de9c 2816
77626355 2817 /* Override starting rate (index 0) if needed for debug purposes */
39e88504 2818 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
98d7e09a 2819
39e88504
GC		 2820 /* Interpret new_rate (rate_n_flags) */
2821 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
b481de9c
ZY		 2822 &tbl_type, &rate_idx);
2823
da5dbb97
WYG		 2824 if (priv && priv->bt_full_concurrent) {
2825 /* 1x1 only */
2826 tbl_type.ant_type =
2827 first_antenna(priv->hw_params.valid_tx_ant);
2828 }
2829
77626355 2830 /* How many times should we repeat the initial rate? */
b481de9c 2831 if (is_legacy(tbl_type.lq_type)) {
aade00ce 2832 ant_toggle_cnt = 1;
1b696de2 2833 repeat_rate = IWL_NUMBER_TRY;
aade00ce 2834 } else {
1b696de2 2835 repeat_rate = IWL_HT_NUMBER_TRY;
aade00ce 2836 }
b481de9c
ZY		 2837
2838 lq_cmd->general_params.mimo_delimiter =
2839 is_mimo(tbl_type.lq_type) ? 1 : 0;
77626355
BC		 2840
2841 /* Fill 1st table entry (index 0) */
39e88504 2842 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
b481de9c 2843
da5dbb97 2844 if (num_of_ant(tbl_type.ant_type) == 1) {
07bc28ed
GC		 2845 lq_cmd->general_params.single_stream_ant_msk =
2846 tbl_type.ant_type;
2847 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2848 lq_cmd->general_params.dual_stream_ant_msk =
2849 tbl_type.ant_type;
2850 } /* otherwise we don't modify the existing value */
b481de9c
ZY		 2851
2852 index++;
1b696de2 2853 repeat_rate--;
bee008b7
WYG		 2854 if (priv) {
2855 if (priv->bt_full_concurrent)
2856 valid_tx_ant = ANT_A;
2857 else
2858 valid_tx_ant = priv->hw_params.valid_tx_ant;
2859 }
aade00ce 2860
77626355 2861 /* Fill rest of rate table */
b481de9c 2862 while (index < LINK_QUAL_MAX_RETRY_NUM) {
77626355
BC		 2863 /* Repeat initial/next rate.
2864 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2865 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
1b696de2 2866 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
b481de9c 2867 if (is_legacy(tbl_type.lq_type)) {
aade00ce
GC		 2868 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2869 ant_toggle_cnt++;
2870 else if (priv &&
2871 rs_toggle_antenna(valid_tx_ant,
2872 &new_rate, &tbl_type))
2873 ant_toggle_cnt = 1;
da5dbb97 2874 }
98d7e09a 2875
77626355 2876 /* Override next rate if needed for debug purposes */
c33104f0 2877 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
77626355
BC		 2878
2879 /* Fill next table entry */
b481de9c 2880 lq_cmd->rs_table[index].rate_n_flags =
39e88504 2881 cpu_to_le32(new_rate);
1b696de2 2882 repeat_rate--;
b481de9c
ZY		 2883 index++;
2884 }
2885
39e88504 2886 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
b481de9c
ZY		 2887 &rate_idx);
2888
da5dbb97
WYG		 2889 if (priv && priv->bt_full_concurrent) {
2890 /* 1x1 only */
2891 tbl_type.ant_type =
2892 first_antenna(priv->hw_params.valid_tx_ant);
2893 }
2894
77626355
BC		 2895 /* Indicate to uCode which entries might be MIMO.
2896 * If initial rate was MIMO, this will finally end up
2897 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
b481de9c
ZY		 2898 if (is_mimo(tbl_type.lq_type))
2899 lq_cmd->general_params.mimo_delimiter = index;
2900
77626355 2901 /* Get next rate */
39e88504
GC		 2902 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2903 use_ht_possible);
b481de9c 2904
77626355 2905 /* How many times should we repeat the next rate? */
b481de9c 2906 if (is_legacy(tbl_type.lq_type)) {
aade00ce
GC		 2907 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2908 ant_toggle_cnt++;
2909 else if (priv &&
2910 rs_toggle_antenna(valid_tx_ant,
2911 &new_rate, &tbl_type))
2912 ant_toggle_cnt = 1;
2913
1b696de2 2914 repeat_rate = IWL_NUMBER_TRY;
aade00ce 2915 } else {
1b696de2 2916 repeat_rate = IWL_HT_NUMBER_TRY;
aade00ce 2917 }
b481de9c 2918
77626355
BC		 2919 /* Don't allow HT rates after next pass.
2920 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
b481de9c
ZY		 2921 use_ht_possible = 0;
2922
77626355 2923 /* Override next rate if needed for debug purposes */
c33104f0 2924 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
77626355
BC		 2925
2926 /* Fill next table entry */
39e88504 2927 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
b481de9c
ZY		 2928
2929 index++;
1b696de2 2930 repeat_rate--;
b481de9c
ZY		 2931 }
2932
4d80d721 2933 lq_cmd->agg_params.agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
13c33a09 2934 lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
7469701e 2935
13c33a09
WYG		 2936 lq_cmd->agg_params.agg_time_limit =
2937 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
7469701e
WYG		 2938 /*
2939 * overwrite if needed, pass aggregation time limit
2940 * to uCode in uSec
2941 */
2942 if (priv && priv->cfg->agg_time_limit &&
2943 priv->cfg->agg_time_limit >= LINK_QUAL_AGG_TIME_LIMIT_MIN &&
2944 priv->cfg->agg_time_limit <= LINK_QUAL_AGG_TIME_LIMIT_MAX)
2945 lq_cmd->agg_params.agg_time_limit =
2946 cpu_to_le16(priv->cfg->agg_time_limit);
b481de9c
ZY		 2947}
2948
4b7679a5 2949static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
b481de9c 2950{
4b7679a5 2951 return hw->priv;
b481de9c
ZY		 2952}
2953/* rate scale requires free function to be implemented */
2954static void rs_free(void *priv_rate)
2955{
2956 return;
2957}
2958
4b7679a5
JB		 2959static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
2960 void *priv_sta)
b481de9c 2961{
45527c2c 2962 struct iwl_priv *priv __maybe_unused = priv_r;
b481de9c 2963
e1623446 2964 IWL_DEBUG_RATE(priv, "enter\n");
e1623446 2965 IWL_DEBUG_RATE(priv, "leave\n");
b481de9c
ZY		 2966}
2967
2968
93dc646a 2969#ifdef CONFIG_MAC80211_DEBUGFS
5ae212c9
ZY		 2970static int open_file_generic(struct inode *inode, struct file *file)
2971{
2972 file->private_data = inode->i_private;
2973 return 0;
2974}
e227ceac
TW		 2975static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2976 u32 *rate_n_flags, int index)
98d7e09a 2977{
bf403db8 2978 struct iwl_priv *priv;
3c4955f8
WYG		 2979 u8 valid_tx_ant;
2980 u8 ant_sel_tx;
bf403db8
EK		 2981
2982 priv = lq_sta->drv;
3c4955f8 2983 valid_tx_ant = priv->hw_params.valid_tx_ant;
39e88504 2984 if (lq_sta->dbg_fixed_rate) {
3c4955f8
WYG		 2985 ant_sel_tx =
2986 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
2987 >> RATE_MCS_ANT_POS);
2988 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
39e88504 2989 *rate_n_flags = lq_sta->dbg_fixed_rate;
3c4955f8 2990 IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
39e88504 2991 } else {
3c4955f8
WYG		 2992 lq_sta->dbg_fixed_rate = 0;
2993 IWL_ERR(priv,
2994 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
2995 ant_sel_tx, valid_tx_ant);
2996 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
39e88504 2997 }
39e88504 2998 } else {
e1623446 2999 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
98d7e09a 3000 }
98d7e09a 3001}
5ae212c9 3002
98d7e09a
ZY		 3003static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3004 const char __user *user_buf, size_t count, loff_t *ppos)
3005{
e227ceac 3006 struct iwl_lq_sta *lq_sta = file->private_data;
bf403db8 3007 struct iwl_priv *priv;
98d7e09a
ZY		 3008 char buf[64];
3009 int buf_size;
3010 u32 parsed_rate;
7e6a5886
JB		 3011 struct iwl_station_priv *sta_priv =
3012 container_of(lq_sta, struct iwl_station_priv, lq_sta);
3013 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
98d7e09a 3014
bf403db8 3015 priv = lq_sta->drv;
98d7e09a
ZY		 3016 memset(buf, 0, sizeof(buf));
3017 buf_size = min(count, sizeof(buf) - 1);
3018 if (copy_from_user(buf, user_buf, buf_size))
3019 return -EFAULT;
3020
3021 if (sscanf(buf, "%x", &parsed_rate) == 1)
39e88504 3022 lq_sta->dbg_fixed_rate = parsed_rate;
98d7e09a 3023 else
39e88504 3024 lq_sta->dbg_fixed_rate = 0;
98d7e09a 3025
39e88504
GC		 3026 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
3027 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3028 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3029 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
98d7e09a 3030
e1623446 3031 IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
39e88504 3032 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
98d7e09a 3033
39e88504 3034 if (lq_sta->dbg_fixed_rate) {
07bc28ed 3035 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
7e6a5886
JB		 3036 iwl_send_lq_cmd(lq_sta->drv, ctx, &lq_sta->lq, CMD_ASYNC,
3037 false);
98d7e09a
ZY		 3038 }
3039
3040 return count;
3041}
0209dc11 3042
5ae212c9
ZY		 3043static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3044 char __user *user_buf, size_t count, loff_t *ppos)
3045{
a412c804 3046 char *buff;
5ae212c9
ZY		 3047 int desc = 0;
3048 int i = 0;
12b96817 3049 int index = 0;
a412c804 3050 ssize_t ret;
5ae212c9 3051
e227ceac 3052 struct iwl_lq_sta *lq_sta = file->private_data;
d8ae4f52 3053 struct iwl_priv *priv;
adb7b5e6 3054 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
5ae212c9 3055
d8ae4f52 3056 priv = lq_sta->drv;
a412c804
FS		 3057 buff = kmalloc(1024, GFP_KERNEL);
3058 if (!buff)
3059 return -ENOMEM;
3060
c33104f0 3061 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
98d7e09a 3062 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
c33104f0 3063 lq_sta->total_failed, lq_sta->total_success,
39e88504 3064 lq_sta->active_legacy_rate);
98d7e09a 3065 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
39e88504 3066 lq_sta->dbg_fixed_rate);
d8ae4f52
WYG		 3067 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3068 (priv->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
3069 (priv->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
3070 (priv->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
adb7b5e6
WYG		 3071 desc += sprintf(buff+desc, "lq type %s\n",
3072 (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
3073 if (is_Ht(tbl->lq_type)) {
3074 desc += sprintf(buff+desc, " %s",
3075 (is_siso(tbl->lq_type)) ? "SISO" :
3076 ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
3077 desc += sprintf(buff+desc, " %s",
7aafef1c 3078 (tbl->is_ht40) ? "40MHz" : "20MHz");
e3949d62
DH		 3079 desc += sprintf(buff+desc, " %s %s %s\n", (tbl->is_SGI) ? "SGI" : "",
3080 (lq_sta->is_green) ? "GF enabled" : "",
3081 (lq_sta->is_agg) ? "AGG on" : "");
adb7b5e6 3082 }
12b96817
WYG		 3083 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3084 lq_sta->last_rate_n_flags);
5ae212c9
ZY		 3085 desc += sprintf(buff+desc, "general:"
3086 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
c33104f0
TW		 3087 lq_sta->lq.general_params.flags,
3088 lq_sta->lq.general_params.mimo_delimiter,
3089 lq_sta->lq.general_params.single_stream_ant_msk,
3090 lq_sta->lq.general_params.dual_stream_ant_msk);
5ae212c9
ZY		 3091
3092 desc += sprintf(buff+desc, "agg:"
3093 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
c33104f0
TW		 3094 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
3095 lq_sta->lq.agg_params.agg_dis_start_th,
3096 lq_sta->lq.agg_params.agg_frame_cnt_limit);
5ae212c9
ZY		 3097
3098 desc += sprintf(buff+desc,
3099 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
c33104f0
TW		 3100 lq_sta->lq.general_params.start_rate_index[0],
3101 lq_sta->lq.general_params.start_rate_index[1],
3102 lq_sta->lq.general_params.start_rate_index[2],
3103 lq_sta->lq.general_params.start_rate_index[3]);
5ae212c9 3104
12b96817
WYG		 3105 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3106 index = iwl_hwrate_to_plcp_idx(
3107 le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
3108 if (is_legacy(tbl->lq_type)) {
3109 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
3110 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3111 iwl_rate_mcs[index].mbps);
3112 } else {
3113 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
3114 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3115 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
3116 }
3117 }
5ae212c9 3118
a412c804
FS		 3119 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3120 kfree(buff);
3121 return ret;
5ae212c9
ZY		 3122}
3123
3124static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
98d7e09a 3125 .write = rs_sta_dbgfs_scale_table_write,
5ae212c9
ZY		 3126 .read = rs_sta_dbgfs_scale_table_read,
3127 .open = open_file_generic,
3128};
0209dc11
ZY		 3129static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3130 char __user *user_buf, size_t count, loff_t *ppos)
3131{
a412c804 3132 char *buff;
0209dc11
ZY		 3133 int desc = 0;
3134 int i, j;
a412c804 3135 ssize_t ret;
0209dc11 3136
e227ceac 3137 struct iwl_lq_sta *lq_sta = file->private_data;
a412c804
FS		 3138
3139 buff = kmalloc(1024, GFP_KERNEL);
3140 if (!buff)
3141 return -ENOMEM;
3142
0209dc11 3143 for (i = 0; i < LQ_SIZE; i++) {
7aafef1c
WYG		 3144 desc += sprintf(buff+desc,
3145 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
0209dc11 3146 "rate=0x%X\n",
c3056065 3147 lq_sta->active_tbl == i ? "*" : "x",
c33104f0
TW		 3148 lq_sta->lq_info[i].lq_type,
3149 lq_sta->lq_info[i].is_SGI,
7aafef1c 3150 lq_sta->lq_info[i].is_ht40,
c33104f0 3151 lq_sta->lq_info[i].is_dup,
2681b20b 3152 lq_sta->is_green,
39e88504 3153 lq_sta->lq_info[i].current_rate);
0209dc11
ZY		 3154 for (j = 0; j < IWL_RATE_COUNT; j++) {
3155 desc += sprintf(buff+desc,
c33104f0
TW		 3156 "counter=%d success=%d %%=%d\n",
3157 lq_sta->lq_info[i].win[j].counter,
3158 lq_sta->lq_info[i].win[j].success_counter,
3159 lq_sta->lq_info[i].win[j].success_ratio);
0209dc11
ZY		 3160 }
3161 }
a412c804
FS		 3162 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3163 kfree(buff);
3164 return ret;
0209dc11
ZY		 3165}
3166
3167static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3168 .read = rs_sta_dbgfs_stats_table_read,
3169 .open = open_file_generic,
3170};
5ae212c9 3171
38167459
WYG		 3172static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3173 char __user *user_buf, size_t count, loff_t *ppos)
3174{
3175 char buff[120];
3176 int desc = 0;
3177 ssize_t ret;
3178
3179 struct iwl_lq_sta *lq_sta = file->private_data;
3180 struct iwl_priv *priv;
3181 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3182
3183 priv = lq_sta->drv;
3184
3185 if (is_Ht(tbl->lq_type))
3186 desc += sprintf(buff+desc,
3187 "Bit Rate= %d Mb/s\n",
3188 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3189 else
3190 desc += sprintf(buff+desc,
3191 "Bit Rate= %d Mb/s\n",
3192 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
38167459
WYG		 3193
3194 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3195 return ret;
3196}
3197
3198static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3199 .read = rs_sta_dbgfs_rate_scale_data_read,
3200 .open = open_file_generic,
3201};
3202
93dc646a
ZY		 3203static void rs_add_debugfs(void *priv, void *priv_sta,
3204 struct dentry *dir)
3205{
e227ceac 3206 struct iwl_lq_sta *lq_sta = priv_sta;
c33104f0 3207 lq_sta->rs_sta_dbgfs_scale_table_file =
43e85115 3208 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
c33104f0
TW		 3209 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3210 lq_sta->rs_sta_dbgfs_stats_table_file =
43e85115 3211 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
c33104f0 3212 lq_sta, &rs_sta_dbgfs_stats_table_ops);
38167459 3213 lq_sta->rs_sta_dbgfs_rate_scale_data_file =
43e85115 3214 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
38167459 3215 lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
0c11b4de 3216 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
43e85115 3217 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
0c11b4de 3218 &lq_sta->tx_agg_tid_en);
0c11b4de 3219
93dc646a
ZY		 3220}
3221
3222static void rs_remove_debugfs(void *priv, void *priv_sta)
3223{
e227ceac 3224 struct iwl_lq_sta *lq_sta = priv_sta;
c33104f0
TW		 3225 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3226 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
38167459 3227 debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
0c11b4de 3228 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
93dc646a
ZY		 3229}
3230#endif
3231
fe6b23dd
RC		 3232/*
3233 * Initialization of rate scaling information is done by driver after
3234 * the station is added. Since mac80211 calls this function before a
3235 * station is added we ignore it.
3236 */
3237static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband,
3238 struct ieee80211_sta *sta, void *priv_sta)
3239{
3240}
b481de9c
ZY		 3241static struct rate_control_ops rs_ops = {
3242 .module = NULL,
3243 .name = RS_NAME,
3244 .tx_status = rs_tx_status,
3245 .get_rate = rs_get_rate,
fe6b23dd 3246 .rate_init = rs_rate_init_stub,
b481de9c
ZY		 3247 .alloc = rs_alloc,
3248 .free = rs_free,
3249 .alloc_sta = rs_alloc_sta,
3250 .free_sta = rs_free_sta,
93dc646a
ZY		 3251#ifdef CONFIG_MAC80211_DEBUGFS
3252 .add_sta_debugfs = rs_add_debugfs,
3253 .remove_sta_debugfs = rs_remove_debugfs,
3254#endif
b481de9c
ZY		 3255};
3256
e227ceac 3257int iwlagn_rate_control_register(void)
b481de9c 3258{
897e1cf2 3259 return ieee80211_rate_control_register(&rs_ops);
b481de9c
ZY		 3260}
3261
e227ceac 3262void iwlagn_rate_control_unregister(void)
b481de9c
ZY		 3263{
3264 ieee80211_rate_control_unregister(&rs_ops);
3265}
3266
Linux kernel - Deliverables
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