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mac80211: clean up ieee80211_stop_tx_ba_session
[net-next-2.6.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);
b481de9c
ZY		 85
86
98d7e09a 87#ifdef CONFIG_MAC80211_DEBUGFS
e227ceac
TW		 88static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
89 u32 *rate_n_flags, int index);
98d7e09a 90#else
e227ceac
TW		 91static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
92 u32 *rate_n_flags, int index)
98d7e09a
ZY		 93{}
94#endif
77626355 95
e3949d62
DH		 96/**
97 * The following tables contain the expected throughput metrics for all rates
98 *
99 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
100 *
101 * where invalid entries are zeros.
102 *
103 * CCK rates are only valid in legacy table and will only be used in G
104 * (2.4 GHz) band.
77626355 105 */
584a0f00 106
e3949d62
DH		 107static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
108 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
b481de9c
ZY		 109};
110
e3949d62
DH		 111static s32 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
112 {0, 0, 0, 0, 42, 0, 76, 102, 124, 158, 183, 193, 202}, /* Norm */
113 {0, 0, 0, 0, 46, 0, 82, 110, 132, 167, 192, 202, 210}, /* SGI */
114 {0, 0, 0, 0, 48, 0, 93, 135, 176, 251, 319, 351, 381}, /* AGG */
115 {0, 0, 0, 0, 53, 0, 102, 149, 193, 275, 348, 381, 413}, /* AGG+SGI */
b481de9c
ZY		 116};
117
e3949d62
DH		 118static s32 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
119 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
120 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
121 {0, 0, 0, 0, 96, 0, 182, 259, 328, 451, 553, 598, 640}, /* AGG */
122 {0, 0, 0, 0, 106, 0, 199, 282, 357, 487, 593, 640, 683}, /* AGG+SGI */
b481de9c
ZY		 123};
124
e3949d62
DH		 125static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
126 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250}, /* Norm */
127 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256}, /* SGI */
128 {0, 0, 0, 0, 92, 0, 175, 250, 317, 436, 534, 578, 619}, /* AGG */
129 {0, 0, 0, 0, 102, 0, 192, 273, 344, 470, 573, 619, 660}, /* AGG+SGI*/
b481de9c
ZY		 130};
131
e3949d62
DH		 132static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
133 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
134 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
135 {0, 0, 0, 0, 180, 0, 327, 446, 545, 708, 828, 878, 922}, /* AGG */
136 {0, 0, 0, 0, 197, 0, 355, 481, 584, 752, 872, 922, 966}, /* AGG+SGI */
b481de9c
ZY		 137};
138
e3949d62
DH		 139static s32 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = {
140 {0, 0, 0, 0, 99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */
141 {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */
142 {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */
143 {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */
584a0f00
WYG		 144};
145
e3949d62
DH		 146static s32 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = {
147 {0, 0, 0, 0, 152, 0, 211, 239, 255, 279, 290, 294, 297}, /* Norm */
148 {0, 0, 0, 0, 160, 0, 219, 245, 261, 284, 294, 297, 300}, /* SGI */
149 {0, 0, 0, 0, 254, 0, 443, 584, 695, 868, 984, 1030, 1070}, /* AGG */
150 {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */
584a0f00
WYG		 151};
152
12b96817 153/* mbps, mcs */
79496738 154static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
e3949d62
DH		 155 { "1", "BPSK DSSS"},
156 { "2", "QPSK DSSS"},
157 {"5.5", "BPSK CCK"},
158 { "11", "QPSK CCK"},
159 { "6", "BPSK 1/2"},
160 { "9", "BPSK 1/2"},
161 { "12", "QPSK 1/2"},
162 { "18", "QPSK 3/4"},
163 { "24", "16QAM 1/2"},
164 { "36", "16QAM 3/4"},
165 { "48", "64QAM 2/3"},
166 { "54", "64QAM 3/4"},
167 { "60", "64QAM 5/6"},
12b96817
WYG		 168};
169
a9c146b3
WYG		 170#define MCS_INDEX_PER_STREAM (8)
171
39e88504 172static inline u8 rs_extract_rate(u32 rate_n_flags)
b481de9c
ZY		 173{
174 return (u8)(rate_n_flags & 0xFF);
175}
176
e227ceac 177static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
b481de9c
ZY		 178{
179 window->data = 0;
180 window->success_counter = 0;
181 window->success_ratio = IWL_INVALID_VALUE;
182 window->counter = 0;
183 window->average_tpt = IWL_INVALID_VALUE;
184 window->stamp = 0;
b481de9c
ZY		 185}
186
aade00ce
GC		 187static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
188{
3ac7f146 189 return (ant_type & valid_antenna) == ant_type;
aade00ce
GC		 190}
191
0c11b4de
RR		 192/*
193 * removes the old data from the statistics. All data that is older than
194 * TID_MAX_TIME_DIFF, will be deleted.
195 */
e227ceac 196static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
0c11b4de
RR		 197{
198 /* The oldest age we want to keep */
199 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
200
201 while (tl->queue_count &&
202 (tl->time_stamp < oldest_time)) {
203 tl->total -= tl->packet_count[tl->head];
204 tl->packet_count[tl->head] = 0;
205 tl->time_stamp += TID_QUEUE_CELL_SPACING;
206 tl->queue_count--;
207 tl->head++;
208 if (tl->head >= TID_QUEUE_MAX_SIZE)
209 tl->head = 0;
210 }
211}
212
213/*
214 * increment traffic load value for tid and also remove
215 * any old values if passed the certain time period
216 */
e227ceac 217static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
faa29718 218 struct ieee80211_hdr *hdr)
0c11b4de
RR		 219{
220 u32 curr_time = jiffies_to_msecs(jiffies);
221 u32 time_diff;
222 s32 index;
e227ceac 223 struct iwl_traffic_load *tl = NULL;
54dbb525 224 u8 tid;
0c11b4de 225
417f114b 226 if (ieee80211_is_data_qos(hdr->frame_control)) {
fd7c8a40 227 u8 *qc = ieee80211_get_qos_ctl(hdr);
54dbb525
TW		 228 tid = qc[0] & 0xf;
229 } else
faa29718 230 return MAX_TID_COUNT;
0c11b4de 231
e6a6cf4c
RC		 232 if (unlikely(tid >= TID_MAX_LOAD_COUNT))
233 return MAX_TID_COUNT;
234
0c11b4de
RR		 235 tl = &lq_data->load[tid];
236
237 curr_time -= curr_time % TID_ROUND_VALUE;
238
239 /* Happens only for the first packet. Initialize the data */
240 if (!(tl->queue_count)) {
241 tl->total = 1;
242 tl->time_stamp = curr_time;
243 tl->queue_count = 1;
244 tl->head = 0;
245 tl->packet_count[0] = 1;
faa29718 246 return MAX_TID_COUNT;
0c11b4de
RR		 247 }
248
249 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
250 index = time_diff / TID_QUEUE_CELL_SPACING;
251
252 /* The history is too long: remove data that is older than */
253 /* TID_MAX_TIME_DIFF */
254 if (index >= TID_QUEUE_MAX_SIZE)
255 rs_tl_rm_old_stats(tl, curr_time);
256
257 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
258 tl->packet_count[index] = tl->packet_count[index] + 1;
259 tl->total = tl->total + 1;
260
261 if ((index + 1) > tl->queue_count)
262 tl->queue_count = index + 1;
faa29718
RR		 263
264 return tid;
0c11b4de
RR		 265}
266
267/*
268 get the traffic load value for tid
269*/
e227ceac 270static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
0c11b4de
RR		 271{
272 u32 curr_time = jiffies_to_msecs(jiffies);
273 u32 time_diff;
274 s32 index;
e227ceac 275 struct iwl_traffic_load *tl = NULL;
0c11b4de
RR		 276
277 if (tid >= TID_MAX_LOAD_COUNT)
278 return 0;
279
280 tl = &(lq_data->load[tid]);
281
282 curr_time -= curr_time % TID_ROUND_VALUE;
283
284 if (!(tl->queue_count))
285 return 0;
286
287 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
288 index = time_diff / TID_QUEUE_CELL_SPACING;
289
290 /* The history is too long: remove data that is older than */
291 /* TID_MAX_TIME_DIFF */
292 if (index >= TID_QUEUE_MAX_SIZE)
293 rs_tl_rm_old_stats(tl, curr_time);
294
295 return tl->total;
296}
297
82ca9341 298static int rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
e227ceac 299 struct iwl_lq_sta *lq_data, u8 tid,
4b7679a5 300 struct ieee80211_sta *sta)
0c11b4de 301{
82ca9341 302 int ret = -EAGAIN;
45d42700 303
ff550cb4 304 if (rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
e1623446 305 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
e174961c 306 sta->addr, tid);
45d42700
WYG		 307 ret = ieee80211_start_tx_ba_session(sta, tid);
308 if (ret == -EAGAIN) {
309 /*
310 * driver and mac80211 is out of sync
311 * this might be cause by reloading firmware
312 * stop the tx ba session here
313 */
314 IWL_DEBUG_HT(priv, "Fail start Tx agg on tid: %d\n",
315 tid);
6a8579d0 316 ieee80211_stop_tx_ba_session(sta, tid);
45d42700 317 }
82ca9341
WYG		 318 } else
319 IWL_ERR(priv, "Fail finding valid aggregation tid: %d\n", tid);
320 return ret;
0c11b4de
RR		 321}
322
c79dd5b5 323static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
e227ceac 324 struct iwl_lq_sta *lq_data,
4b7679a5 325 struct ieee80211_sta *sta)
0c11b4de 326{
82ca9341
WYG		 327 if ((tid < TID_MAX_LOAD_COUNT) &&
328 !rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta)) {
329 if (priv->cfg->use_rts_for_ht) {
330 /*
331 * switch to RTS/CTS if it is the prefer protection
332 * method for HT traffic
333 */
334 IWL_DEBUG_HT(priv, "use RTS/CTS protection for HT\n");
335 priv->staging_rxon.flags &= ~RXON_FLG_SELF_CTS_EN;
336 iwlcore_commit_rxon(priv);
337 }
47eef9bd 338 }
0c11b4de
RR		 339}
340
39e88504 341static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
fde0db31 342{
3ac7f146
TW		 343 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
344 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
345 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
fde0db31
GC		 346}
347
04f2dec1
SZ		 348/*
349 * Static function to get the expected throughput from an iwl_scale_tbl_info
350 * that wraps a NULL pointer check
351 */
352static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
353{
354 if (tbl->expected_tpt)
355 return tbl->expected_tpt[rs_index];
356 return 0;
357}
358
77626355
BC		 359/**
360 * rs_collect_tx_data - Update the success/failure sliding window
361 *
362 * We keep a sliding window of the last 62 packets transmitted
363 * at this rate. window->data contains the bitmask of successful
364 * packets.
365 */
04f2dec1
SZ		 366static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
367 int scale_index, int attempts, int successes)
b481de9c 368{
e227ceac 369 struct iwl_rate_scale_data *window = NULL;
39e88504 370 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
04f2dec1 371 s32 fail_count, tpt;
b481de9c 372
dc2453ae
TW		 373 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
374 return -EINVAL;
b481de9c 375
e3949d62 376 /* Select window for current tx bit rate */
04f2dec1
SZ		 377 window = &(tbl->win[scale_index]);
378
379 /* Get expected throughput */
380 tpt = get_expected_tpt(tbl, scale_index);
b481de9c 381
77626355
BC		 382 /*
383 * Keep track of only the latest 62 tx frame attempts in this rate's
384 * history window; anything older isn't really relevant any more.
385 * If we have filled up the sliding window, drop the oldest attempt;
386 * if the oldest attempt (highest bit in bitmap) shows "success",
387 * subtract "1" from the success counter (this is the main reason
388 * we keep these bitmaps!).
389 */
e3949d62 390 while (attempts > 0) {
39e88504
GC		 391 if (window->counter >= IWL_RATE_MAX_WINDOW) {
392
393 /* remove earliest */
394 window->counter = IWL_RATE_MAX_WINDOW - 1;
395
99556438
RR		 396 if (window->data & mask) {
397 window->data &= ~mask;
39e88504 398 window->success_counter--;
99556438 399 }
b481de9c 400 }
b481de9c 401
99556438
RR		 402 /* Increment frames-attempted counter */
403 window->counter++;
404
e3949d62 405 /* Shift bitmap by one frame to throw away oldest history */
90d7795e 406 window->data <<= 1;
e3949d62
DH		 407
408 /* Mark the most recent #successes attempts as successful */
99556438 409 if (successes > 0) {
39e88504 410 window->success_counter++;
99556438
RR		 411 window->data |= 0x1;
412 successes--;
413 }
77626355 414
e3949d62 415 attempts--;
b481de9c
ZY		 416 }
417
77626355 418 /* Calculate current success ratio, avoid divide-by-0! */
b481de9c
ZY		 419 if (window->counter > 0)
420 window->success_ratio = 128 * (100 * window->success_counter)
421 / window->counter;
422 else
423 window->success_ratio = IWL_INVALID_VALUE;
424
425 fail_count = window->counter - window->success_counter;
426
77626355 427 /* Calculate average throughput, if we have enough history. */
b481de9c
ZY		 428 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
429 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
430 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
431 else
432 window->average_tpt = IWL_INVALID_VALUE;
433
77626355 434 /* Tag this window as having been updated */
b481de9c
ZY		 435 window->stamp = jiffies;
436
dc2453ae 437 return 0;
b481de9c
ZY		 438}
439
77626355
BC		 440/*
441 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
442 */
39e88504 443/* FIXME:RS:remove this function and put the flags statically in the table */
978785a3
TW		 444static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
445 struct iwl_scale_tbl_info *tbl,
446 int index, u8 use_green)
b481de9c 447{
39e88504
GC		 448 u32 rate_n_flags = 0;
449
b481de9c 450 if (is_legacy(tbl->lq_type)) {
1826dcc0 451 rate_n_flags = iwl_rates[index].plcp;
b481de9c 452 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
39e88504 453 rate_n_flags |= RATE_MCS_CCK_MSK;
b481de9c 454
fde0db31
GC		 455 } else if (is_Ht(tbl->lq_type)) {
456 if (index > IWL_LAST_OFDM_RATE) {
978785a3 457 IWL_ERR(priv, "Invalid HT rate index %d\n", index);
b481de9c 458 index = IWL_LAST_OFDM_RATE;
fde0db31 459 }
39e88504 460 rate_n_flags = RATE_MCS_HT_MSK;
fde0db31
GC		 461
462 if (is_siso(tbl->lq_type))
1826dcc0 463 rate_n_flags |= iwl_rates[index].plcp_siso;
fde0db31 464 else if (is_mimo2(tbl->lq_type))
1826dcc0 465 rate_n_flags |= iwl_rates[index].plcp_mimo2;
fde0db31 466 else
1826dcc0 467 rate_n_flags |= iwl_rates[index].plcp_mimo3;
b481de9c 468 } else {
978785a3 469 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
b481de9c
ZY		 470 }
471
39e88504 472 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
fde0db31 473 RATE_MCS_ANT_ABC_MSK);
b481de9c 474
39e88504 475 if (is_Ht(tbl->lq_type)) {
7aafef1c 476 if (tbl->is_ht40) {
39e88504
GC		 477 if (tbl->is_dup)
478 rate_n_flags |= RATE_MCS_DUP_MSK;
479 else
7aafef1c 480 rate_n_flags |= RATE_MCS_HT40_MSK;
39e88504
GC		 481 }
482 if (tbl->is_SGI)
483 rate_n_flags |= RATE_MCS_SGI_MSK;
484
485 if (use_green) {
486 rate_n_flags |= RATE_MCS_GF_MSK;
487 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
488 rate_n_flags &= ~RATE_MCS_SGI_MSK;
978785a3 489 IWL_ERR(priv, "GF was set with SGI:SISO\n");
39e88504
GC		 490 }
491 }
b481de9c 492 }
39e88504 493 return rate_n_flags;
b481de9c
ZY		 494}
495
77626355
BC		 496/*
497 * Interpret uCode API's rate_n_flags format,
498 * fill "search" or "active" tx mode table.
499 */
39e88504 500static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
8318d78a 501 enum ieee80211_band band,
e227ceac 502 struct iwl_scale_tbl_info *tbl,
b481de9c
ZY		 503 int *rate_idx)
504{
39e88504
GC		 505 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
506 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
507 u8 mcs;
b481de9c 508
e7d326ac 509 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
b481de9c 510
fde0db31 511 if (*rate_idx == IWL_RATE_INVALID) {
b481de9c 512 *rate_idx = -1;
dc2453ae 513 return -EINVAL;
b481de9c 514 }
77626355 515 tbl->is_SGI = 0; /* default legacy setup */
7aafef1c 516 tbl->is_ht40 = 0;
b481de9c 517 tbl->is_dup = 0;
fde0db31
GC		 518 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
519 tbl->lq_type = LQ_NONE;
d6e93399 520 tbl->max_search = IWL_MAX_SEARCH;
b481de9c 521
77626355 522 /* legacy rate format */
39e88504 523 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
fde0db31 524 if (num_of_ant == 1) {
8318d78a 525 if (band == IEEE80211_BAND_5GHZ)
b481de9c
ZY		 526 tbl->lq_type = LQ_A;
527 else
528 tbl->lq_type = LQ_G;
b481de9c 529 }
fde0db31 530 /* HT rate format */
b481de9c 531 } else {
39e88504 532 if (rate_n_flags & RATE_MCS_SGI_MSK)
b481de9c
ZY		 533 tbl->is_SGI = 1;
534
7aafef1c 535 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
39e88504 536 (rate_n_flags & RATE_MCS_DUP_MSK))
7aafef1c 537 tbl->is_ht40 = 1;
b481de9c 538
39e88504 539 if (rate_n_flags & RATE_MCS_DUP_MSK)
b481de9c 540 tbl->is_dup = 1;
fde0db31 541
39e88504 542 mcs = rs_extract_rate(rate_n_flags);
fde0db31 543
39e88504
GC		 544 /* SISO */
545 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
fde0db31
GC		 546 if (num_of_ant == 1)
547 tbl->lq_type = LQ_SISO; /*else NONE*/
548 /* MIMO2 */
39e88504 549 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
fde0db31
GC		 550 if (num_of_ant == 2)
551 tbl->lq_type = LQ_MIMO2;
552 /* MIMO3 */
553 } else {
d6e93399
MA		 554 if (num_of_ant == 3) {
555 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
fde0db31 556 tbl->lq_type = LQ_MIMO3;
d6e93399 557 }
fde0db31 558 }
b481de9c
ZY		 559 }
560 return 0;
561}
aade00ce
GC		 562
563/* switch to another antenna/antennas and return 1 */
564/* if no other valid antenna found, return 0 */
565static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
e227ceac 566 struct iwl_scale_tbl_info *tbl)
b481de9c 567{
aade00ce
GC		 568 u8 new_ant_type;
569
570 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
571 return 0;
572
573 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
574 return 0;
575
576 new_ant_type = ant_toggle_lookup[tbl->ant_type];
577
578 while ((new_ant_type != tbl->ant_type) &&
579 !rs_is_valid_ant(valid_ant, new_ant_type))
580 new_ant_type = ant_toggle_lookup[new_ant_type];
581
582 if (new_ant_type == tbl->ant_type)
583 return 0;
584
585 tbl->ant_type = new_ant_type;
586 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
587 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
588 return 1;
b481de9c
ZY		 589}
590
b261793d
DH		 591/**
592 * Green-field mode is valid if the station supports it and
593 * there are no non-GF stations present in the BSS.
594 */
595static inline u8 rs_use_green(struct ieee80211_sta *sta,
fad95bf5 596 struct iwl_ht_config *ht_conf)
b481de9c 597{
b261793d
DH		 598 return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
599 !(ht_conf->non_GF_STA_present);
b481de9c
ZY		 600}
601
602/**
603 * rs_get_supported_rates - get the available rates
604 *
605 * if management frame or broadcast frame only return
606 * basic available rates.
607 *
608 */
e227ceac
TW		 609static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
610 struct ieee80211_hdr *hdr,
611 enum iwl_table_type rate_type)
b481de9c 612{
eecd6e57
GC		 613 if (is_legacy(rate_type)) {
614 return lq_sta->active_legacy_rate;
615 } else {
b481de9c 616 if (is_siso(rate_type))
eecd6e57 617 return lq_sta->active_siso_rate;
fde0db31 618 else if (is_mimo2(rate_type))
eecd6e57 619 return lq_sta->active_mimo2_rate;
b481de9c 620 else
eecd6e57 621 return lq_sta->active_mimo3_rate;
c33104f0 622 }
b481de9c
ZY		 623}
624
bf403db8
EK		 625static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
626 int rate_type)
b481de9c
ZY		 627{
628 u8 high = IWL_RATE_INVALID;
629 u8 low = IWL_RATE_INVALID;
630
01ebd063 631 /* 802.11A or ht walks to the next literal adjacent rate in
b481de9c
ZY		 632 * the rate table */
633 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
634 int i;
635 u32 mask;
636
637 /* Find the previous rate that is in the rate mask */
638 i = index - 1;
639 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
640 if (rate_mask & mask) {
641 low = i;
642 break;
643 }
644 }
645
646 /* Find the next rate that is in the rate mask */
647 i = index + 1;
648 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
649 if (rate_mask & mask) {
650 high = i;
651 break;
652 }
653 }
654
655 return (high << 8) | low;
656 }
657
658 low = index;
659 while (low != IWL_RATE_INVALID) {
1826dcc0 660 low = iwl_rates[low].prev_rs;
b481de9c
ZY		 661 if (low == IWL_RATE_INVALID)
662 break;
663 if (rate_mask & (1 << low))
664 break;
e1623446 665 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
b481de9c
ZY		 666 }
667
668 high = index;
669 while (high != IWL_RATE_INVALID) {
1826dcc0 670 high = iwl_rates[high].next_rs;
b481de9c
ZY		 671 if (high == IWL_RATE_INVALID)
672 break;
673 if (rate_mask & (1 << high))
674 break;
e1623446 675 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
b481de9c
ZY		 676 }
677
678 return (high << 8) | low;
679}
680
e227ceac
TW		 681static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
682 struct iwl_scale_tbl_info *tbl,
683 u8 scale_index, u8 ht_possible)
b481de9c 684{
b481de9c
ZY		 685 s32 low;
686 u16 rate_mask;
687 u16 high_low;
688 u8 switch_to_legacy = 0;
c33104f0 689 u8 is_green = lq_sta->is_green;
2ff6578b 690 struct iwl_priv *priv = lq_sta->drv;
b481de9c
ZY		 691
692 /* check if we need to switch from HT to legacy rates.
693 * assumption is that mandatory rates (1Mbps or 6Mbps)
694 * are always supported (spec demand) */
695 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
696 switch_to_legacy = 1;
697 scale_index = rs_ht_to_legacy[scale_index];
8318d78a 698 if (lq_sta->band == IEEE80211_BAND_5GHZ)
b481de9c
ZY		 699 tbl->lq_type = LQ_A;
700 else
701 tbl->lq_type = LQ_G;
702
69fdb309 703 if (num_of_ant(tbl->ant_type) > 1)
2ff6578b
WYG		 704 tbl->ant_type =
705 first_antenna(priv->hw_params.valid_tx_ant);
b481de9c 706
7aafef1c 707 tbl->is_ht40 = 0;
b481de9c 708 tbl->is_SGI = 0;
d6e93399 709 tbl->max_search = IWL_MAX_SEARCH;
b481de9c
ZY		 710 }
711
eecd6e57 712 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
b481de9c 713
77626355 714 /* Mask with station rate restriction */
b481de9c 715 if (is_legacy(tbl->lq_type)) {
77626355 716 /* supp_rates has no CCK bits in A mode */
8318d78a 717 if (lq_sta->band == IEEE80211_BAND_5GHZ)
b481de9c 718 rate_mask = (u16)(rate_mask &
c33104f0 719 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
b481de9c 720 else
c33104f0 721 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
b481de9c
ZY		 722 }
723
77626355 724 /* If we switched from HT to legacy, check current rate */
dc2453ae 725 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
39e88504
GC		 726 low = scale_index;
727 goto out;
b481de9c
ZY		 728 }
729
bf403db8
EK		 730 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
731 tbl->lq_type);
b481de9c
ZY		 732 low = high_low & 0xff;
733
39e88504
GC		 734 if (low == IWL_RATE_INVALID)
735 low = scale_index;
736
737out:
978785a3 738 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
b481de9c
ZY		 739}
740
95407aa4
DH		 741/*
742 * Simple function to compare two rate scale table types
743 */
744static bool table_type_matches(struct iwl_scale_tbl_info *a,
745 struct iwl_scale_tbl_info *b)
746{
747 return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
748 (a->is_SGI == b->is_SGI);
749}
95407aa4 750
77626355
BC		 751/*
752 * mac80211 sends us Tx status
753 */
4b7679a5
JB		 754static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
755 struct ieee80211_sta *sta, void *priv_sta,
e039fa4a 756 struct sk_buff *skb)
b481de9c 757{
95407aa4
DH		 758 int legacy_success;
759 int retries;
760 int rs_index, mac_index, i;
417f114b 761 struct iwl_lq_sta *lq_sta = priv_sta;
66c73db7 762 struct iwl_link_quality_cmd *table;
b481de9c 763 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
4b7679a5 764 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
e039fa4a 765 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
5027309b 766 enum mac80211_rate_control_flags mac_flags;
39e88504 767 u32 tx_rate;
e227ceac 768 struct iwl_scale_tbl_info tbl_type;
04f2dec1 769 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
b481de9c 770
e1623446 771 IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
b481de9c 772
fe6b23dd
RC		 773 /* Treat uninitialized rate scaling data same as non-existing. */
774 if (!lq_sta) {
775 IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n");
776 return;
777 } else if (!lq_sta->drv) {
778 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
779 return;
780 }
781
417f114b 782 if (!ieee80211_is_data(hdr->frame_control) ||
514d65c1 783 info->flags & IEEE80211_TX_CTL_NO_ACK)
b481de9c
ZY		 784 return;
785
e3949d62 786 /* This packet was aggregated but doesn't carry status info */
e039fa4a
JB		 787 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
788 !(info->flags & IEEE80211_TX_STAT_AMPDU))
99556438
RR		 789 return;
790
77626355
BC		 791 /*
792 * Ignore this Tx frame response if its initial rate doesn't match
793 * that of latest Link Quality command. There may be stragglers
794 * from a previous Link Quality command, but we're no longer interested
795 * in those; they're either from the "active" mode while we're trying
796 * to check "search" mode, or a prior "search" mode after we've moved
797 * to a new "search" mode (which might become the new "active" mode).
798 */
95407aa4 799 table = &lq_sta->lq;
39e88504
GC		 800 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
801 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
4c424e4c
RR		 802 if (priv->band == IEEE80211_BAND_5GHZ)
803 rs_index -= IWL_FIRST_OFDM_RATE;
5027309b
DH		 804 mac_flags = info->status.rates[0].flags;
805 mac_index = info->status.rates[0].idx;
31513be8
DH		 806 /* For HT packets, map MCS to PLCP */
807 if (mac_flags & IEEE80211_TX_RC_MCS) {
808 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
809 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
810 mac_index++;
392a0baf
DH		 811 /*
812 * mac80211 HT index is always zero-indexed; we need to move
813 * HT OFDM rates after CCK rates in 2.4 GHz band
814 */
815 if (priv->band == IEEE80211_BAND_2GHZ)
816 mac_index += IWL_FIRST_OFDM_RATE;
31513be8 817 }
95407aa4 818 /* Here we actually compare this rate to the latest LQ command */
5027309b
DH		 819 if ((mac_index < 0) ||
820 (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
821 (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
822 (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
e6a9854b 823 (tbl_type.ant_type != info->antenna_sel_tx) ||
5027309b
DH		 824 (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
825 (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
31513be8
DH		 826 (rs_index != mac_index)) {
827 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate);
95407aa4
DH		 828 /*
829 * Since rates mis-match, the last LQ command may have failed.
830 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
831 * ... driver.
d5e49036 832 */
7d049e5a
AM		 833 lq_sta->missed_rate_counter++;
834 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
835 lq_sta->missed_rate_counter = 0;
fe6b23dd 836 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC, false);
7d049e5a 837 }
95407aa4
DH		 838 /* Regardless, ignore this status info for outdated rate */
839 return;
840 } else
841 /* Rate did match, so reset the missed_rate_counter */
842 lq_sta->missed_rate_counter = 0;
843
844 /* Figure out if rate scale algorithm is in active or search table */
845 if (table_type_matches(&tbl_type,
846 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
847 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
848 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
849 } else if (table_type_matches(&tbl_type,
850 &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
851 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
852 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
853 } else {
854 IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n");
855 return;
b481de9c
ZY		 856 }
857
95407aa4
DH		 858 /*
859 * Updating the frame history depends on whether packets were
860 * aggregated.
861 *
862 * For aggregation, all packets were transmitted at the same rate, the
863 * first index into rate scale table.
864 */
865 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
866 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
867 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
868 &rs_index);
04f2dec1 869 rs_collect_tx_data(curr_tbl, rs_index,
e3a3cd87
DH		 870 info->status.ampdu_len,
871 info->status.ampdu_ack_len);
95407aa4
DH		 872
873 /* Update success/fail counts if not searching for new mode */
874 if (lq_sta->stay_in_tbl) {
e3a3cd87
DH		 875 lq_sta->total_success += info->status.ampdu_ack_len;
876 lq_sta->total_failed += (info->status.ampdu_len -
877 info->status.ampdu_ack_len);
b481de9c 878 }
95407aa4 879 } else {
77626355 880 /*
95407aa4 881 * For legacy, update frame history with for each Tx retry.
77626355 882 */
95407aa4
DH		 883 retries = info->status.rates[0].count - 1;
884 /* HW doesn't send more than 15 retries */
885 retries = min(retries, 15);
886
887 /* The last transmission may have been successful */
888 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
889 /* Collect data for each rate used during failed TX attempts */
890 for (i = 0; i <= retries; ++i) {
891 tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
892 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
893 &tbl_type, &rs_index);
894 /*
895 * Only collect stats if retried rate is in the same RS
896 * table as active/search.
897 */
898 if (table_type_matches(&tbl_type, curr_tbl))
04f2dec1 899 tmp_tbl = curr_tbl;
95407aa4 900 else if (table_type_matches(&tbl_type, other_tbl))
04f2dec1 901 tmp_tbl = other_tbl;
95407aa4
DH		 902 else
903 continue;
04f2dec1
SZ		 904 rs_collect_tx_data(tmp_tbl, rs_index, 1,
905 i < retries ? 0 : legacy_success);
95407aa4
DH		 906 }
907
908 /* Update success/fail counts if not searching for new mode */
909 if (lq_sta->stay_in_tbl) {
910 lq_sta->total_success += legacy_success;
911 lq_sta->total_failed += retries + (1 - legacy_success);
99556438 912 }
b481de9c 913 }
95407aa4
DH		 914 /* The last TX rate is cached in lq_sta; it's set in if/else above */
915 lq_sta->last_rate_n_flags = tx_rate;
b481de9c 916
77626355 917 /* See if there's a better rate or modulation mode to try. */
c338ba3c 918 if (sta && sta->supp_rates[sband->band])
514d65c1 919 rs_rate_scale_perform(priv, skb, sta, lq_sta);
b481de9c
ZY		 920}
921
77626355
BC		 922/*
923 * Begin a period of staying with a selected modulation mode.
924 * Set "stay_in_tbl" flag to prevent any mode switches.
925 * Set frame tx success limits according to legacy vs. high-throughput,
926 * and reset overall (spanning all rates) tx success history statistics.
927 * These control how long we stay using same modulation mode before
928 * searching for a new mode.
929 */
bf403db8 930static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
e227ceac 931 struct iwl_lq_sta *lq_sta)
b481de9c 932{
e1623446 933 IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
c33104f0 934 lq_sta->stay_in_tbl = 1; /* only place this gets set */
b481de9c 935 if (is_legacy) {
c33104f0
TW		 936 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
937 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
938 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
b481de9c 939 } else {
c33104f0
TW		 940 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
941 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
942 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
b481de9c 943 }
c33104f0
TW		 944 lq_sta->table_count = 0;
945 lq_sta->total_failed = 0;
946 lq_sta->total_success = 0;
447fee70 947 lq_sta->flush_timer = jiffies;
d6e93399 948 lq_sta->action_counter = 0;
b481de9c
ZY		 949}
950
77626355
BC		 951/*
952 * Find correct throughput table for given mode of modulation
953 */
e227ceac
TW		 954static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
955 struct iwl_scale_tbl_info *tbl)
b481de9c 956{
e3949d62
DH		 957 /* Used to choose among HT tables */
958 s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
959
960 /* Check for invalid LQ type */
961 if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
962 tbl->expected_tpt = expected_tpt_legacy;
963 return;
964 }
965
966 /* Legacy rates have only one table */
b481de9c 967 if (is_legacy(tbl->lq_type)) {
e3949d62
DH		 968 tbl->expected_tpt = expected_tpt_legacy;
969 return;
970 }
971
972 /* Choose among many HT tables depending on number of streams
973 * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
974 * status */
975 if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
976 ht_tbl_pointer = expected_tpt_siso20MHz;
977 else if (is_siso(tbl->lq_type))
978 ht_tbl_pointer = expected_tpt_siso40MHz;
979 else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
980 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
981 else if (is_mimo2(tbl->lq_type))
982 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
983 else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
984 ht_tbl_pointer = expected_tpt_mimo3_20MHz;
985 else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
986 ht_tbl_pointer = expected_tpt_mimo3_40MHz;
987
988 if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */
989 tbl->expected_tpt = ht_tbl_pointer[0];
990 else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */
991 tbl->expected_tpt = ht_tbl_pointer[1];
992 else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */
993 tbl->expected_tpt = ht_tbl_pointer[2];
994 else /* AGG+SGI */
995 tbl->expected_tpt = ht_tbl_pointer[3];
b481de9c
ZY		 996}
997
77626355
BC		 998/*
999 * Find starting rate for new "search" high-throughput mode of modulation.
1000 * Goal is to find lowest expected rate (under perfect conditions) that is
1001 * above the current measured throughput of "active" mode, to give new mode
1002 * a fair chance to prove itself without too many challenges.
1003 *
1004 * This gets called when transitioning to more aggressive modulation
1005 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1006 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1007 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1008 * bit rate will typically need to increase, but not if performance was bad.
1009 */
c79dd5b5 1010static s32 rs_get_best_rate(struct iwl_priv *priv,
e227ceac
TW		 1011 struct iwl_lq_sta *lq_sta,
1012 struct iwl_scale_tbl_info *tbl, /* "search" */
f935a6da 1013 u16 rate_mask, s8 index)
b481de9c 1014{
77626355 1015 /* "active" values */
e227ceac 1016 struct iwl_scale_tbl_info *active_tbl =
c33104f0 1017 &(lq_sta->lq_info[lq_sta->active_tbl]);
b481de9c 1018 s32 active_sr = active_tbl->win[index].success_ratio;
b481de9c 1019 s32 active_tpt = active_tbl->expected_tpt[index];
77626355
BC		 1020
1021 /* expected "search" throughput */
1022 s32 *tpt_tbl = tbl->expected_tpt;
1023
1024 s32 new_rate, high, low, start_hi;
b481de9c 1025 u16 high_low;
f935a6da 1026 s8 rate = index;
b481de9c
ZY		 1027
1028 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1029
1030 for (; ;) {
bf403db8
EK		 1031 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1032 tbl->lq_type);
b481de9c
ZY		 1033
1034 low = high_low & 0xff;
1035 high = (high_low >> 8) & 0xff;
1036
77626355
BC		 1037 /*
1038 * Lower the "search" bit rate, to give new "search" mode
1039 * approximately the same throughput as "active" if:
1040 *
1041 * 1) "Active" mode has been working modestly well (but not
1042 * great), and expected "search" throughput (under perfect
1043 * conditions) at candidate rate is above the actual
1044 * measured "active" throughput (but less than expected
1045 * "active" throughput under perfect conditions).
1046 * OR
1047 * 2) "Active" mode has been working perfectly or very well
1048 * and expected "search" throughput (under perfect
1049 * conditions) at candidate rate is above expected
1050 * "active" throughput (under perfect conditions).
1051 */
c33104f0 1052 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
b481de9c
ZY		 1053 ((active_sr > IWL_RATE_DECREASE_TH) &&
1054 (active_sr <= IWL_RATE_HIGH_TH) &&
1055 (tpt_tbl[rate] <= active_tpt))) ||
1056 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1057 (tpt_tbl[rate] > active_tpt))) {
1058
77626355
BC		 1059 /* (2nd or later pass)
1060 * If we've already tried to raise the rate, and are
1061 * now trying to lower it, use the higher rate. */
b481de9c
ZY		 1062 if (start_hi != IWL_RATE_INVALID) {
1063 new_rate = start_hi;
1064 break;
1065 }
77626355 1066
b481de9c 1067 new_rate = rate;
77626355
BC		 1068
1069 /* Loop again with lower rate */
b481de9c
ZY		 1070 if (low != IWL_RATE_INVALID)
1071 rate = low;
77626355
BC		 1072
1073 /* Lower rate not available, use the original */
b481de9c
ZY		 1074 else
1075 break;
77626355
BC		 1076
1077 /* Else try to raise the "search" rate to match "active" */
b481de9c 1078 } else {
77626355
BC		 1079 /* (2nd or later pass)
1080 * If we've already tried to lower the rate, and are
1081 * now trying to raise it, use the lower rate. */
b481de9c
ZY		 1082 if (new_rate != IWL_RATE_INVALID)
1083 break;
77626355
BC		 1084
1085 /* Loop again with higher rate */
b481de9c
ZY		 1086 else if (high != IWL_RATE_INVALID) {
1087 start_hi = high;
1088 rate = high;
77626355
BC		 1089
1090 /* Higher rate not available, use the original */
b481de9c 1091 } else {
90d7795e 1092 new_rate = rate;
b481de9c
ZY		 1093 break;
1094 }
1095 }
1096 }
1097
1098 return new_rate;
1099}
b481de9c 1100
77626355 1101/*
584a0f00 1102 * Set up search table for MIMO2
77626355 1103 */
fde0db31 1104static int rs_switch_to_mimo2(struct iwl_priv *priv,
e227ceac 1105 struct iwl_lq_sta *lq_sta,
270243a5 1106 struct ieee80211_conf *conf,
4b7679a5 1107 struct ieee80211_sta *sta,
e227ceac 1108 struct iwl_scale_tbl_info *tbl, int index)
b481de9c 1109{
b481de9c
ZY		 1110 u16 rate_mask;
1111 s32 rate;
c33104f0 1112 s8 is_green = lq_sta->is_green;
b481de9c 1113
de27e64e 1114 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
b481de9c
ZY		 1115 return -1;
1116
d9fe60de 1117 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
00c5ae2f 1118 == WLAN_HT_CAP_SM_PS_STATIC)
b481de9c
ZY		 1119 return -1;
1120
77626355 1121 /* Need both Tx chains/antennas to support MIMO */
aade00ce 1122 if (priv->hw_params.tx_chains_num < 2)
b481de9c
ZY		 1123 return -1;
1124
e1623446 1125 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
39e88504
GC		 1126
1127 tbl->lq_type = LQ_MIMO2;
c33104f0 1128 tbl->is_dup = lq_sta->is_dup;
b481de9c 1129 tbl->action = 0;
d6e93399 1130 tbl->max_search = IWL_MAX_SEARCH;
39e88504
GC		 1131 rate_mask = lq_sta->active_mimo2_rate;
1132
7aafef1c
WYG		 1133 if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1134 tbl->is_ht40 = 1;
b481de9c 1135 else
7aafef1c 1136 tbl->is_ht40 = 0;
b481de9c 1137
eecd6e57 1138 rs_set_expected_tpt_table(lq_sta, tbl);
b481de9c 1139
f935a6da 1140 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
b481de9c 1141
e1623446 1142 IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
584a0f00
WYG		 1143 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1144 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1145 rate, rate_mask);
1146 return -1;
1147 }
1148 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1149
1150 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1151 tbl->current_rate, is_green);
1152 return 0;
1153}
1154
1155/*
1156 * Set up search table for MIMO3
1157 */
1158static int rs_switch_to_mimo3(struct iwl_priv *priv,
1159 struct iwl_lq_sta *lq_sta,
1160 struct ieee80211_conf *conf,
1161 struct ieee80211_sta *sta,
1162 struct iwl_scale_tbl_info *tbl, int index)
1163{
1164 u16 rate_mask;
1165 s32 rate;
1166 s8 is_green = lq_sta->is_green;
1167
1168 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1169 return -1;
1170
1171 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1172 == WLAN_HT_CAP_SM_PS_STATIC)
1173 return -1;
1174
1175 /* Need both Tx chains/antennas to support MIMO */
1176 if (priv->hw_params.tx_chains_num < 3)
1177 return -1;
1178
1179 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1180
1181 tbl->lq_type = LQ_MIMO3;
1182 tbl->is_dup = lq_sta->is_dup;
1183 tbl->action = 0;
d6e93399 1184 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
584a0f00
WYG		 1185 rate_mask = lq_sta->active_mimo3_rate;
1186
7aafef1c
WYG		 1187 if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1188 tbl->is_ht40 = 1;
584a0f00 1189 else
7aafef1c 1190 tbl->is_ht40 = 0;
39e88504 1191
584a0f00
WYG		 1192 rs_set_expected_tpt_table(lq_sta, tbl);
1193
1194 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1195
1196 IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1197 rate, rate_mask);
39e88504 1198 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
e1623446 1199 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
39e88504 1200 rate, rate_mask);
b481de9c 1201 return -1;
39e88504 1202 }
978785a3 1203 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
b481de9c 1204
e1623446 1205 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
39e88504 1206 tbl->current_rate, is_green);
dc2453ae 1207 return 0;
fde0db31 1208}
b481de9c 1209
77626355
BC		 1210/*
1211 * Set up search table for SISO
1212 */
c79dd5b5 1213static int rs_switch_to_siso(struct iwl_priv *priv,
e227ceac 1214 struct iwl_lq_sta *lq_sta,
270243a5 1215 struct ieee80211_conf *conf,
4b7679a5 1216 struct ieee80211_sta *sta,
e227ceac 1217 struct iwl_scale_tbl_info *tbl, int index)
b481de9c 1218{
b481de9c 1219 u16 rate_mask;
c33104f0 1220 u8 is_green = lq_sta->is_green;
b481de9c
ZY		 1221 s32 rate;
1222
de27e64e 1223 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
b481de9c
ZY		 1224 return -1;
1225
e1623446 1226 IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
39e88504 1227
c33104f0 1228 tbl->is_dup = lq_sta->is_dup;
b481de9c
ZY		 1229 tbl->lq_type = LQ_SISO;
1230 tbl->action = 0;
d6e93399 1231 tbl->max_search = IWL_MAX_SEARCH;
39e88504 1232 rate_mask = lq_sta->active_siso_rate;
b481de9c 1233
7aafef1c
WYG		 1234 if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1235 tbl->is_ht40 = 1;
b481de9c 1236 else
7aafef1c 1237 tbl->is_ht40 = 0;
b481de9c 1238
b481de9c 1239 if (is_green)
39e88504 1240 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
b481de9c 1241
eecd6e57 1242 rs_set_expected_tpt_table(lq_sta, tbl);
f935a6da 1243 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
b481de9c 1244
e1623446 1245 IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
b481de9c 1246 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
e1623446 1247 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
b481de9c
ZY		 1248 rate, rate_mask);
1249 return -1;
1250 }
978785a3 1251 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
e1623446 1252 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
39e88504 1253 tbl->current_rate, is_green);
403ab56b 1254 return 0;
b481de9c
ZY		 1255}
1256
77626355
BC		 1257/*
1258 * Try to switch to new modulation mode from legacy
1259 */
c79dd5b5 1260static int rs_move_legacy_other(struct iwl_priv *priv,
e227ceac 1261 struct iwl_lq_sta *lq_sta,
270243a5 1262 struct ieee80211_conf *conf,
4b7679a5 1263 struct ieee80211_sta *sta,
b481de9c
ZY		 1264 int index)
1265{
e227ceac
TW		 1266 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1267 struct iwl_scale_tbl_info *search_tbl =
1268 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1269 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1270 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1271 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
b481de9c 1272 u8 start_action = tbl->action;
fde0db31 1273 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
3110bef7 1274 u8 tx_chains_num = priv->hw_params.tx_chains_num;
fde0db31 1275 int ret = 0;
d6e93399 1276 u8 update_search_tbl_counter = 0;
b481de9c 1277
46f9381a
WYG		 1278 if (!iwl_ht_enabled(priv))
1279 /* stay in Legacy */
1280 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
3ad3b92a 1281 else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
46f9381a
WYG		 1282 tbl->action > IWL_LEGACY_SWITCH_SISO)
1283 tbl->action = IWL_LEGACY_SWITCH_SISO;
b481de9c 1284 for (; ;) {
d6e93399 1285 lq_sta->action_counter++;
b481de9c 1286 switch (tbl->action) {
3110bef7
GC		 1287 case IWL_LEGACY_SWITCH_ANTENNA1:
1288 case IWL_LEGACY_SWITCH_ANTENNA2:
e1623446 1289 IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
b481de9c 1290
3110bef7
GC		 1291 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1292 tx_chains_num <= 1) ||
1293 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1294 tx_chains_num <= 2))
1295 break;
1296
77626355 1297 /* Don't change antenna if success has been great */
b481de9c
ZY		 1298 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1299 break;
77626355 1300
77626355 1301 /* Set up search table to try other antenna */
b481de9c
ZY		 1302 memcpy(search_tbl, tbl, sz);
1303
aade00ce
GC		 1304 if (rs_toggle_antenna(valid_tx_ant,
1305 &search_tbl->current_rate, search_tbl)) {
d6e93399 1306 update_search_tbl_counter = 1;
3110bef7 1307 rs_set_expected_tpt_table(lq_sta, search_tbl);
aade00ce
GC		 1308 goto out;
1309 }
a5e8b505 1310 break;
b481de9c 1311 case IWL_LEGACY_SWITCH_SISO:
e1623446 1312 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
77626355
BC		 1313
1314 /* Set up search table to try SISO */
b481de9c 1315 memcpy(search_tbl, tbl, sz);
b481de9c 1316 search_tbl->is_SGI = 0;
c33104f0 1317 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
270243a5 1318 search_tbl, index);
dc2453ae 1319 if (!ret) {
c33104f0 1320 lq_sta->action_counter = 0;
b481de9c 1321 goto out;
dc2453ae 1322 }
b481de9c
ZY		 1323
1324 break;
3110bef7
GC		 1325 case IWL_LEGACY_SWITCH_MIMO2_AB:
1326 case IWL_LEGACY_SWITCH_MIMO2_AC:
1327 case IWL_LEGACY_SWITCH_MIMO2_BC:
e1623446 1328 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
77626355
BC		 1329
1330 /* Set up search table to try MIMO */
b481de9c 1331 memcpy(search_tbl, tbl, sz);
b481de9c 1332 search_tbl->is_SGI = 0;
3110bef7
GC		 1333
1334 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1335 search_tbl->ant_type = ANT_AB;
1336 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1337 search_tbl->ant_type = ANT_AC;
1338 else
1339 search_tbl->ant_type = ANT_BC;
1340
1341 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1342 break;
1343
fde0db31 1344 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
270243a5 1345 search_tbl, index);
dc2453ae 1346 if (!ret) {
c33104f0 1347 lq_sta->action_counter = 0;
b481de9c 1348 goto out;
dc2453ae 1349 }
b481de9c 1350 break;
584a0f00
WYG		 1351
1352 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1353 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1354
1355 /* Set up search table to try MIMO3 */
1356 memcpy(search_tbl, tbl, sz);
1357 search_tbl->is_SGI = 0;
1358
1359 search_tbl->ant_type = ANT_ABC;
1360
1361 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1362 break;
1363
1364 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1365 search_tbl, index);
1366 if (!ret) {
1367 lq_sta->action_counter = 0;
1368 goto out;
1369 }
1370 break;
b481de9c
ZY		 1371 }
1372 tbl->action++;
584a0f00 1373 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
3110bef7 1374 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
b481de9c
ZY		 1375
1376 if (tbl->action == start_action)
1377 break;
1378
1379 }
3110bef7 1380 search_tbl->lq_type = LQ_NONE;
b481de9c
ZY		 1381 return 0;
1382
3110bef7
GC		 1383out:
1384 lq_sta->search_better_tbl = 1;
b481de9c 1385 tbl->action++;
584a0f00 1386 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
3110bef7 1387 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
d6e93399
MA		 1388 if (update_search_tbl_counter)
1389 search_tbl->action = tbl->action;
b481de9c
ZY		 1390 return 0;
1391
1392}
1393
77626355
BC		 1394/*
1395 * Try to switch to new modulation mode from SISO
1396 */
c79dd5b5 1397static int rs_move_siso_to_other(struct iwl_priv *priv,
e227ceac 1398 struct iwl_lq_sta *lq_sta,
270243a5 1399 struct ieee80211_conf *conf,
4b7679a5 1400 struct ieee80211_sta *sta, int index)
b481de9c 1401{
c33104f0 1402 u8 is_green = lq_sta->is_green;
e227ceac
TW		 1403 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1404 struct iwl_scale_tbl_info *search_tbl =
1405 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1406 struct iwl_rate_scale_data *window = &(tbl->win[index]);
28e6f489 1407 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
e227ceac
TW		 1408 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1409 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
b481de9c 1410 u8 start_action = tbl->action;
fde0db31 1411 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
3110bef7 1412 u8 tx_chains_num = priv->hw_params.tx_chains_num;
d6e93399 1413 u8 update_search_tbl_counter = 0;
fde0db31 1414 int ret;
b481de9c 1415
3ad3b92a 1416 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
46f9381a
WYG		 1417 tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1418 /* stay in SISO */
1419 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1420 }
b481de9c 1421 for (;;) {
c33104f0 1422 lq_sta->action_counter++;
b481de9c 1423 switch (tbl->action) {
3110bef7
GC		 1424 case IWL_SISO_SWITCH_ANTENNA1:
1425 case IWL_SISO_SWITCH_ANTENNA2:
e1623446 1426 IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
3110bef7
GC		 1427
1428 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1429 tx_chains_num <= 1) ||
1430 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1431 tx_chains_num <= 2))
1432 break;
1433
b481de9c
ZY		 1434 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1435 break;
b481de9c
ZY		 1436
1437 memcpy(search_tbl, tbl, sz);
aade00ce 1438 if (rs_toggle_antenna(valid_tx_ant,
d6e93399
MA		 1439 &search_tbl->current_rate, search_tbl)) {
1440 update_search_tbl_counter = 1;
aade00ce 1441 goto out;
d6e93399 1442 }
a5e8b505 1443 break;
3110bef7
GC		 1444 case IWL_SISO_SWITCH_MIMO2_AB:
1445 case IWL_SISO_SWITCH_MIMO2_AC:
1446 case IWL_SISO_SWITCH_MIMO2_BC:
e1623446 1447 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
b481de9c 1448 memcpy(search_tbl, tbl, sz);
b481de9c 1449 search_tbl->is_SGI = 0;
3110bef7
GC		 1450
1451 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1452 search_tbl->ant_type = ANT_AB;
1453 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1454 search_tbl->ant_type = ANT_AC;
1455 else
1456 search_tbl->ant_type = ANT_BC;
1457
1458 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1459 break;
1460
fde0db31 1461 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
270243a5 1462 search_tbl, index);
3110bef7 1463 if (!ret)
b481de9c
ZY		 1464 goto out;
1465 break;
1466 case IWL_SISO_SWITCH_GI:
28e6f489
DH		 1467 if (!tbl->is_ht40 && !(ht_cap->cap &
1468 IEEE80211_HT_CAP_SGI_20))
a9841013 1469 break;
28e6f489
DH		 1470 if (tbl->is_ht40 && !(ht_cap->cap &
1471 IEEE80211_HT_CAP_SGI_40))
a9841013
EG		 1472 break;
1473
e1623446 1474 IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
0c11b4de 1475
b481de9c 1476 memcpy(search_tbl, tbl, sz);
39e88504
GC		 1477 if (is_green) {
1478 if (!tbl->is_SGI)
1479 break;
1480 else
15b1687c
WT		 1481 IWL_ERR(priv,
1482 "SGI was set in GF+SISO\n");
b481de9c 1483 }
39e88504 1484 search_tbl->is_SGI = !tbl->is_SGI;
eecd6e57 1485 rs_set_expected_tpt_table(lq_sta, search_tbl);
39e88504
GC		 1486 if (tbl->is_SGI) {
1487 s32 tpt = lq_sta->last_tpt / 100;
1488 if (tpt >= search_tbl->expected_tpt[index])
1489 break;
1490 }
978785a3
TW		 1491 search_tbl->current_rate =
1492 rate_n_flags_from_tbl(priv, search_tbl,
1493 index, is_green);
d6e93399 1494 update_search_tbl_counter = 1;
b481de9c 1495 goto out;
584a0f00
WYG		 1496 case IWL_SISO_SWITCH_MIMO3_ABC:
1497 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1498 memcpy(search_tbl, tbl, sz);
1499 search_tbl->is_SGI = 0;
1500 search_tbl->ant_type = ANT_ABC;
1501
1502 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1503 break;
1504
1505 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1506 search_tbl, index);
1507 if (!ret)
1508 goto out;
1509 break;
b481de9c
ZY		 1510 }
1511 tbl->action++;
584a0f00 1512 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
3110bef7 1513 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
b481de9c
ZY		 1514
1515 if (tbl->action == start_action)
1516 break;
1517 }
3110bef7 1518 search_tbl->lq_type = LQ_NONE;
b481de9c
ZY		 1519 return 0;
1520
1521 out:
3110bef7 1522 lq_sta->search_better_tbl = 1;
b481de9c 1523 tbl->action++;
584a0f00 1524 if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
3110bef7 1525 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
d6e93399
MA		 1526 if (update_search_tbl_counter)
1527 search_tbl->action = tbl->action;
1528
b481de9c
ZY		 1529 return 0;
1530}
1531
77626355 1532/*
584a0f00 1533 * Try to switch to new modulation mode from MIMO2
77626355 1534 */
584a0f00 1535static int rs_move_mimo2_to_other(struct iwl_priv *priv,
e227ceac 1536 struct iwl_lq_sta *lq_sta,
270243a5 1537 struct ieee80211_conf *conf,
4b7679a5 1538 struct ieee80211_sta *sta, int index)
b481de9c 1539{
c33104f0 1540 s8 is_green = lq_sta->is_green;
e227ceac
TW		 1541 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1542 struct iwl_scale_tbl_info *search_tbl =
1543 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
3110bef7 1544 struct iwl_rate_scale_data *window = &(tbl->win[index]);
28e6f489 1545 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
e227ceac
TW		 1546 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1547 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
b481de9c 1548 u8 start_action = tbl->action;
3110bef7
GC		 1549 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1550 u8 tx_chains_num = priv->hw_params.tx_chains_num;
d6e93399 1551 u8 update_search_tbl_counter = 0;
aade00ce 1552 int ret;
b481de9c 1553
3ad3b92a 1554 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
46f9381a
WYG		 1555 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1556 tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1557 /* switch in SISO */
1558 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1559 }
b481de9c 1560 for (;;) {
c33104f0 1561 lq_sta->action_counter++;
b481de9c 1562 switch (tbl->action) {
3110bef7
GC		 1563 case IWL_MIMO2_SWITCH_ANTENNA1:
1564 case IWL_MIMO2_SWITCH_ANTENNA2:
584a0f00 1565 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
3110bef7
GC		 1566
1567 if (tx_chains_num <= 2)
1568 break;
1569
1570 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1571 break;
1572
1573 memcpy(search_tbl, tbl, sz);
1574 if (rs_toggle_antenna(valid_tx_ant,
d6e93399
MA		 1575 &search_tbl->current_rate, search_tbl)) {
1576 update_search_tbl_counter = 1;
3110bef7 1577 goto out;
d6e93399 1578 }
3110bef7
GC		 1579 break;
1580 case IWL_MIMO2_SWITCH_SISO_A:
1581 case IWL_MIMO2_SWITCH_SISO_B:
1582 case IWL_MIMO2_SWITCH_SISO_C:
e1623446 1583 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
0c11b4de 1584
77626355 1585 /* Set up new search table for SISO */
b481de9c 1586 memcpy(search_tbl, tbl, sz);
39e88504 1587
3110bef7 1588 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
fde0db31 1589 search_tbl->ant_type = ANT_A;
3110bef7 1590 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
fde0db31 1591 search_tbl->ant_type = ANT_B;
3110bef7
GC		 1592 else
1593 search_tbl->ant_type = ANT_C;
1594
1595 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1596 break;
b481de9c 1597
c33104f0 1598 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
270243a5 1599 search_tbl, index);
3110bef7 1600 if (!ret)
b481de9c 1601 goto out;
3110bef7 1602
b481de9c
ZY		 1603 break;
1604
3110bef7 1605 case IWL_MIMO2_SWITCH_GI:
28e6f489
DH		 1606 if (!tbl->is_ht40 && !(ht_cap->cap &
1607 IEEE80211_HT_CAP_SGI_20))
a9841013 1608 break;
28e6f489
DH		 1609 if (tbl->is_ht40 && !(ht_cap->cap &
1610 IEEE80211_HT_CAP_SGI_40))
a9841013
EG		 1611 break;
1612
584a0f00 1613 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
77626355 1614
584a0f00 1615 /* Set up new search table for MIMO2 */
b481de9c 1616 memcpy(search_tbl, tbl, sz);
39e88504 1617 search_tbl->is_SGI = !tbl->is_SGI;
eecd6e57 1618 rs_set_expected_tpt_table(lq_sta, search_tbl);
77626355
BC		 1619 /*
1620 * If active table already uses the fastest possible
1621 * modulation (dual stream with short guard interval),
1622 * and it's working well, there's no need to look
1623 * for a better type of modulation!
1624 */
39e88504 1625 if (tbl->is_SGI) {
c33104f0 1626 s32 tpt = lq_sta->last_tpt / 100;
39e88504
GC		 1627 if (tpt >= search_tbl->expected_tpt[index])
1628 break;
b481de9c 1629 }
978785a3
TW		 1630 search_tbl->current_rate =
1631 rate_n_flags_from_tbl(priv, search_tbl,
1632 index, is_green);
d6e93399 1633 update_search_tbl_counter = 1;
b481de9c
ZY		 1634 goto out;
1635
584a0f00
WYG		 1636 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1637 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1638 memcpy(search_tbl, tbl, sz);
1639 search_tbl->is_SGI = 0;
1640 search_tbl->ant_type = ANT_ABC;
1641
1642 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1643 break;
1644
1645 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1646 search_tbl, index);
1647 if (!ret)
1648 goto out;
1649
1650 break;
b481de9c
ZY		 1651 }
1652 tbl->action++;
584a0f00 1653 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
3110bef7 1654 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
b481de9c
ZY		 1655
1656 if (tbl->action == start_action)
1657 break;
1658 }
3110bef7 1659 search_tbl->lq_type = LQ_NONE;
b481de9c
ZY		 1660 return 0;
1661 out:
3110bef7 1662 lq_sta->search_better_tbl = 1;
b481de9c 1663 tbl->action++;
584a0f00 1664 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
3110bef7 1665 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
d6e93399
MA		 1666 if (update_search_tbl_counter)
1667 search_tbl->action = tbl->action;
1668
b481de9c
ZY		 1669 return 0;
1670
1671}
1672
584a0f00
WYG		 1673/*
1674 * Try to switch to new modulation mode from MIMO3
1675 */
1676static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1677 struct iwl_lq_sta *lq_sta,
1678 struct ieee80211_conf *conf,
1679 struct ieee80211_sta *sta, int index)
1680{
1681 s8 is_green = lq_sta->is_green;
1682 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1683 struct iwl_scale_tbl_info *search_tbl =
1684 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1685 struct iwl_rate_scale_data *window = &(tbl->win[index]);
28e6f489 1686 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
584a0f00
WYG		 1687 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1688 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1689 u8 start_action = tbl->action;
1690 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1691 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1692 int ret;
d6e93399 1693 u8 update_search_tbl_counter = 0;
584a0f00 1694
3ad3b92a 1695 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
46f9381a
WYG		 1696 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1697 tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1698 /* switch in SISO */
1699 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1700 }
584a0f00
WYG		 1701 for (;;) {
1702 lq_sta->action_counter++;
1703 switch (tbl->action) {
1704 case IWL_MIMO3_SWITCH_ANTENNA1:
1705 case IWL_MIMO3_SWITCH_ANTENNA2:
1706 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
1707
1708 if (tx_chains_num <= 3)
1709 break;
1710
1711 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1712 break;
1713
1714 memcpy(search_tbl, tbl, sz);
1715 if (rs_toggle_antenna(valid_tx_ant,
1716 &search_tbl->current_rate, search_tbl))
1717 goto out;
1718 break;
1719 case IWL_MIMO3_SWITCH_SISO_A:
1720 case IWL_MIMO3_SWITCH_SISO_B:
1721 case IWL_MIMO3_SWITCH_SISO_C:
1722 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
1723
1724 /* Set up new search table for SISO */
1725 memcpy(search_tbl, tbl, sz);
1726
1727 if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
1728 search_tbl->ant_type = ANT_A;
1729 else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
1730 search_tbl->ant_type = ANT_B;
1731 else
1732 search_tbl->ant_type = ANT_C;
1733
1734 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1735 break;
1736
1737 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1738 search_tbl, index);
1739 if (!ret)
1740 goto out;
1741
1742 break;
1743
1744 case IWL_MIMO3_SWITCH_MIMO2_AB:
1745 case IWL_MIMO3_SWITCH_MIMO2_AC:
1746 case IWL_MIMO3_SWITCH_MIMO2_BC:
1747 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
1748
1749 memcpy(search_tbl, tbl, sz);
1750 search_tbl->is_SGI = 0;
1751 if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
1752 search_tbl->ant_type = ANT_AB;
1753 else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
1754 search_tbl->ant_type = ANT_AC;
1755 else
1756 search_tbl->ant_type = ANT_BC;
1757
1758 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1759 break;
1760
1761 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1762 search_tbl, index);
1763 if (!ret)
1764 goto out;
1765
1766 break;
1767
1768 case IWL_MIMO3_SWITCH_GI:
28e6f489
DH		 1769 if (!tbl->is_ht40 && !(ht_cap->cap &
1770 IEEE80211_HT_CAP_SGI_20))
584a0f00 1771 break;
28e6f489
DH		 1772 if (tbl->is_ht40 && !(ht_cap->cap &
1773 IEEE80211_HT_CAP_SGI_40))
584a0f00
WYG		 1774 break;
1775
1776 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
1777
1778 /* Set up new search table for MIMO */
1779 memcpy(search_tbl, tbl, sz);
1780 search_tbl->is_SGI = !tbl->is_SGI;
1781 rs_set_expected_tpt_table(lq_sta, search_tbl);
1782 /*
1783 * If active table already uses the fastest possible
1784 * modulation (dual stream with short guard interval),
1785 * and it's working well, there's no need to look
1786 * for a better type of modulation!
1787 */
1788 if (tbl->is_SGI) {
1789 s32 tpt = lq_sta->last_tpt / 100;
1790 if (tpt >= search_tbl->expected_tpt[index])
1791 break;
1792 }
1793 search_tbl->current_rate =
1794 rate_n_flags_from_tbl(priv, search_tbl,
1795 index, is_green);
d6e93399 1796 update_search_tbl_counter = 1;
584a0f00
WYG		 1797 goto out;
1798 }
1799 tbl->action++;
1800 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1801 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1802
1803 if (tbl->action == start_action)
1804 break;
1805 }
1806 search_tbl->lq_type = LQ_NONE;
1807 return 0;
1808 out:
1809 lq_sta->search_better_tbl = 1;
1810 tbl->action++;
1811 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1812 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
d6e93399
MA		 1813 if (update_search_tbl_counter)
1814 search_tbl->action = tbl->action;
1815
584a0f00
WYG		 1816 return 0;
1817
1818}
1819
77626355
BC		 1820/*
1821 * Check whether we should continue using same modulation mode, or
1822 * begin search for a new mode, based on:
1823 * 1) # tx successes or failures while using this mode
1824 * 2) # times calling this function
1825 * 3) elapsed time in this mode (not used, for now)
1826 */
e227ceac 1827static void rs_stay_in_table(struct iwl_lq_sta *lq_sta)
b481de9c 1828{
e227ceac 1829 struct iwl_scale_tbl_info *tbl;
b481de9c
ZY		 1830 int i;
1831 int active_tbl;
1832 int flush_interval_passed = 0;
bf403db8 1833 struct iwl_priv *priv;
b481de9c 1834
bf403db8 1835 priv = lq_sta->drv;
c33104f0 1836 active_tbl = lq_sta->active_tbl;
b481de9c 1837
c33104f0 1838 tbl = &(lq_sta->lq_info[active_tbl]);
b481de9c 1839
77626355 1840 /* If we've been disallowing search, see if we should now allow it */
c33104f0 1841 if (lq_sta->stay_in_tbl) {
b481de9c 1842
77626355 1843 /* Elapsed time using current modulation mode */
c33104f0 1844 if (lq_sta->flush_timer)
b481de9c 1845 flush_interval_passed =
447fee70
MA		 1846 time_after(jiffies,
1847 (unsigned long)(lq_sta->flush_timer +
b481de9c
ZY		 1848 IWL_RATE_SCALE_FLUSH_INTVL));
1849
77626355
BC		 1850 /*
1851 * Check if we should allow search for new modulation mode.
1852 * If many frames have failed or succeeded, or we've used
1853 * this same modulation for a long time, allow search, and
1854 * reset history stats that keep track of whether we should
1855 * allow a new search. Also (below) reset all bitmaps and
1856 * stats in active history.
1857 */
c33104f0
TW		 1858 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1859 (lq_sta->total_success > lq_sta->max_success_limit) ||
1860 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
b481de9c 1861 && (flush_interval_passed))) {
e1623446 1862 IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n:",
c33104f0
TW		 1863 lq_sta->total_failed,
1864 lq_sta->total_success,
b481de9c 1865 flush_interval_passed);
77626355
BC		 1866
1867 /* Allow search for new mode */
c33104f0
TW		 1868 lq_sta->stay_in_tbl = 0; /* only place reset */
1869 lq_sta->total_failed = 0;
1870 lq_sta->total_success = 0;
1871 lq_sta->flush_timer = 0;
77626355
BC		 1872
1873 /*
1874 * Else if we've used this modulation mode enough repetitions
1875 * (regardless of elapsed time or success/failure), reset
1876 * history bitmaps and rate-specific stats for all rates in
1877 * active table.
1878 */
403ab56b 1879 } else {
c33104f0
TW		 1880 lq_sta->table_count++;
1881 if (lq_sta->table_count >=
1882 lq_sta->table_count_limit) {
1883 lq_sta->table_count = 0;
b481de9c 1884
e1623446 1885 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
b481de9c
ZY		 1886 for (i = 0; i < IWL_RATE_COUNT; i++)
1887 rs_rate_scale_clear_window(
1888 &(tbl->win[i]));
1889 }
1890 }
1891
77626355
BC		 1892 /* If transitioning to allow "search", reset all history
1893 * bitmaps and stats in active table (this will become the new
1894 * "search" table). */
c33104f0 1895 if (!lq_sta->stay_in_tbl) {
b481de9c
ZY		 1896 for (i = 0; i < IWL_RATE_COUNT; i++)
1897 rs_rate_scale_clear_window(&(tbl->win[i]));
1898 }
1899 }
1900}
1901
e3139fe7
WYG		 1902/*
1903 * setup rate table in uCode
1904 * return rate_n_flags as used in the table
1905 */
1906static u32 rs_update_rate_tbl(struct iwl_priv *priv,
1907 struct iwl_lq_sta *lq_sta,
1908 struct iwl_scale_tbl_info *tbl,
1909 int index, u8 is_green)
1910{
1911 u32 rate;
1912
1913 /* Update uCode's rate table. */
1914 rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
1915 rs_fill_link_cmd(priv, lq_sta, rate);
fe6b23dd 1916 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC, false);
e3139fe7
WYG		 1917
1918 return rate;
1919}
1920
77626355
BC		 1921/*
1922 * Do rate scaling and search for new modulation mode.
1923 */
c79dd5b5 1924static void rs_rate_scale_perform(struct iwl_priv *priv,
514d65c1 1925 struct sk_buff *skb,
4b7679a5
JB		 1926 struct ieee80211_sta *sta,
1927 struct iwl_lq_sta *lq_sta)
b481de9c 1928{
4b7679a5 1929 struct ieee80211_hw *hw = priv->hw;
270243a5 1930 struct ieee80211_conf *conf = &hw->conf;
514d65c1
GS		 1931 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1932 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
b481de9c
ZY		 1933 int low = IWL_RATE_INVALID;
1934 int high = IWL_RATE_INVALID;
1935 int index;
1936 int i;
e227ceac 1937 struct iwl_rate_scale_data *window = NULL;
b481de9c
ZY		 1938 int current_tpt = IWL_INVALID_VALUE;
1939 int low_tpt = IWL_INVALID_VALUE;
1940 int high_tpt = IWL_INVALID_VALUE;
1941 u32 fail_count;
1942 s8 scale_action = 0;
fd7c8a40 1943 u16 rate_mask;
b481de9c 1944 u8 update_lq = 0;
e227ceac 1945 struct iwl_scale_tbl_info *tbl, *tbl1;
b481de9c 1946 u16 rate_scale_index_msk = 0;
39e88504 1947 u32 rate;
b481de9c
ZY		 1948 u8 is_green = 0;
1949 u8 active_tbl = 0;
1950 u8 done_search = 0;
1951 u16 high_low;
a5e8b505 1952 s32 sr;
0c11b4de 1953 u8 tid = MAX_TID_COUNT;
86b4766b 1954 struct iwl_tid_data *tid_data;
b481de9c 1955
e1623446 1956 IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
b481de9c 1957
514d65c1 1958 /* Send management frames and NO_ACK data using lowest rate. */
417f114b
TW		 1959 /* TODO: this could probably be improved.. */
1960 if (!ieee80211_is_data(hdr->frame_control) ||
514d65c1 1961 info->flags & IEEE80211_TX_CTL_NO_ACK)
b481de9c 1962 return;
b481de9c 1963
4b7679a5 1964 if (!sta || !lq_sta)
b481de9c
ZY		 1965 return;
1966
4b7679a5 1967 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
b481de9c 1968
faa29718 1969 tid = rs_tl_add_packet(lq_sta, hdr);
e3949d62
DH		 1970 if ((tid != MAX_TID_COUNT) && (lq_sta->tx_agg_tid_en & (1 << tid))) {
1971 tid_data = &priv->stations[lq_sta->lq.sta_id].tid[tid];
1972 if (tid_data->agg.state == IWL_AGG_OFF)
1973 lq_sta->is_agg = 0;
1974 else
1975 lq_sta->is_agg = 1;
1976 } else
1977 lq_sta->is_agg = 0;
faa29718 1978
77626355
BC		 1979 /*
1980 * Select rate-scale / modulation-mode table to work with in
1981 * the rest of this function: "search" if searching for better
1982 * modulation mode, or "active" if doing rate scaling within a mode.
1983 */
c33104f0
TW		 1984 if (!lq_sta->search_better_tbl)
1985 active_tbl = lq_sta->active_tbl;
b481de9c 1986 else
c33104f0 1987 active_tbl = 1 - lq_sta->active_tbl;
b481de9c 1988
c33104f0 1989 tbl = &(lq_sta->lq_info[active_tbl]);
2681b20b
WYG		 1990 if (is_legacy(tbl->lq_type))
1991 lq_sta->is_green = 0;
1992 else
b261793d 1993 lq_sta->is_green = rs_use_green(sta, &priv->current_ht_config);
c33104f0 1994 is_green = lq_sta->is_green;
b481de9c 1995
77626355 1996 /* current tx rate */
b7e35008 1997 index = lq_sta->last_txrate_idx;
b481de9c 1998
e1623446 1999 IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
b481de9c
ZY		 2000 tbl->lq_type);
2001
77626355 2002 /* rates available for this association, and for modulation mode */
eecd6e57 2003 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
b481de9c 2004
91dd6c27 2005 IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
b481de9c
ZY		 2006
2007 /* mask with station rate restriction */
2008 if (is_legacy(tbl->lq_type)) {
8318d78a 2009 if (lq_sta->band == IEEE80211_BAND_5GHZ)
77626355 2010 /* supp_rates has no CCK bits in A mode */
b481de9c 2011 rate_scale_index_msk = (u16) (rate_mask &
c33104f0 2012 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
b481de9c
ZY		 2013 else
2014 rate_scale_index_msk = (u16) (rate_mask &
c33104f0 2015 lq_sta->supp_rates);
b481de9c
ZY		 2016
2017 } else
2018 rate_scale_index_msk = rate_mask;
2019
2020 if (!rate_scale_index_msk)
2021 rate_scale_index_msk = rate_mask;
2022
07bc28ed 2023 if (!((1 << index) & rate_scale_index_msk)) {
15b1687c 2024 IWL_ERR(priv, "Current Rate is not valid\n");
e3139fe7
WYG		 2025 if (lq_sta->search_better_tbl) {
2026 /* revert to active table if search table is not valid*/
2027 tbl->lq_type = LQ_NONE;
2028 lq_sta->search_better_tbl = 0;
2029 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2030 /* get "active" rate info */
2031 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2032 rate = rs_update_rate_tbl(priv, lq_sta,
2033 tbl, index, is_green);
2034 }
07bc28ed 2035 return;
b481de9c
ZY		 2036 }
2037
77626355 2038 /* Get expected throughput table and history window for current rate */
07bc28ed 2039 if (!tbl->expected_tpt) {
15b1687c 2040 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
07bc28ed
GC		 2041 return;
2042 }
b481de9c 2043
c6ec7a9b
AM		 2044 /* force user max rate if set by user */
2045 if ((lq_sta->max_rate_idx != -1) &&
2046 (lq_sta->max_rate_idx < index)) {
2047 index = lq_sta->max_rate_idx;
2048 update_lq = 1;
2049 window = &(tbl->win[index]);
2050 goto lq_update;
2051 }
2052
b481de9c
ZY		 2053 window = &(tbl->win[index]);
2054
77626355
BC		 2055 /*
2056 * If there is not enough history to calculate actual average
2057 * throughput, keep analyzing results of more tx frames, without
2058 * changing rate or mode (bypass most of the rest of this function).
2059 * Set up new rate table in uCode only if old rate is not supported
2060 * in current association (use new rate found above).
2061 */
b481de9c 2062 fail_count = window->counter - window->success_counter;
07bc28ed
GC		 2063 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2064 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
e1623446 2065 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
b481de9c
ZY		 2066 "for index %d\n",
2067 window->success_counter, window->counter, index);
77626355
BC		 2068
2069 /* Can't calculate this yet; not enough history */
b481de9c 2070 window->average_tpt = IWL_INVALID_VALUE;
77626355
BC		 2071
2072 /* Should we stay with this modulation mode,
2073 * or search for a new one? */
c33104f0 2074 rs_stay_in_table(lq_sta);
77626355 2075
b481de9c 2076 goto out;
3110bef7 2077 }
77626355
BC		 2078 /* Else we have enough samples; calculate estimate of
2079 * actual average throughput */
3d79b2a9
RC		 2080 if (window->average_tpt != ((window->success_ratio *
2081 tbl->expected_tpt[index] + 64) / 128)) {
2082 IWL_ERR(priv, "expected_tpt should have been calculated by now\n");
2083 window->average_tpt = ((window->success_ratio *
2084 tbl->expected_tpt[index] + 64) / 128);
2085 }
b481de9c 2086
77626355 2087 /* If we are searching for better modulation mode, check success. */
46f9381a 2088 if (lq_sta->search_better_tbl &&
3ad3b92a 2089 (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
77626355
BC		 2090 /* If good success, continue using the "search" mode;
2091 * no need to send new link quality command, since we're
2092 * continuing to use the setup that we've been trying. */
07bc28ed
GC		 2093 if (window->average_tpt > lq_sta->last_tpt) {
2094
e1623446 2095 IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
07bc28ed
GC		 2096 "suc=%d cur-tpt=%d old-tpt=%d\n",
2097 window->success_ratio,
2098 window->average_tpt,
2099 lq_sta->last_tpt);
2100
2101 if (!is_legacy(tbl->lq_type))
c33104f0 2102 lq_sta->enable_counter = 1;
07bc28ed 2103
77626355 2104 /* Swap tables; "search" becomes "active" */
c33104f0 2105 lq_sta->active_tbl = active_tbl;
b481de9c 2106 current_tpt = window->average_tpt;
77626355
BC		 2107
2108 /* Else poor success; go back to mode in "active" table */
b481de9c 2109 } else {
07bc28ed 2110
e1623446 2111 IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
07bc28ed
GC		 2112 "suc=%d cur-tpt=%d old-tpt=%d\n",
2113 window->success_ratio,
2114 window->average_tpt,
2115 lq_sta->last_tpt);
2116
77626355 2117 /* Nullify "search" table */
b481de9c 2118 tbl->lq_type = LQ_NONE;
77626355
BC		 2119
2120 /* Revert to "active" table */
c33104f0
TW		 2121 active_tbl = lq_sta->active_tbl;
2122 tbl = &(lq_sta->lq_info[active_tbl]);
b481de9c 2123
77626355 2124 /* Revert to "active" rate and throughput info */
e7d326ac 2125 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
c33104f0 2126 current_tpt = lq_sta->last_tpt;
b481de9c 2127
77626355 2128 /* Need to set up a new rate table in uCode */
b481de9c 2129 update_lq = 1;
b481de9c 2130 }
77626355
BC		 2131
2132 /* Either way, we've made a decision; modulation mode
2133 * search is done, allow rate adjustment next time. */
c33104f0 2134 lq_sta->search_better_tbl = 0;
77626355 2135 done_search = 1; /* Don't switch modes below! */
b481de9c
ZY		 2136 goto lq_update;
2137 }
2138
77626355
BC		 2139 /* (Else) not in search of better modulation mode, try for better
2140 * starting rate, while staying in this mode. */
bf403db8 2141 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
b481de9c
ZY		 2142 tbl->lq_type);
2143 low = high_low & 0xff;
2144 high = (high_low >> 8) & 0xff;
2145
c6ec7a9b
AM		 2146 /* If user set max rate, dont allow higher than user constrain */
2147 if ((lq_sta->max_rate_idx != -1) &&
2148 (lq_sta->max_rate_idx < high))
2149 high = IWL_RATE_INVALID;
2150
a5e8b505
GC		 2151 sr = window->success_ratio;
2152
77626355 2153 /* Collect measured throughputs for current and adjacent rates */
b481de9c 2154 current_tpt = window->average_tpt;
b481de9c
ZY		 2155 if (low != IWL_RATE_INVALID)
2156 low_tpt = tbl->win[low].average_tpt;
b481de9c
ZY		 2157 if (high != IWL_RATE_INVALID)
2158 high_tpt = tbl->win[high].average_tpt;
2159
a5e8b505 2160 scale_action = 0;
b481de9c 2161
77626355 2162 /* Too many failures, decrease rate */
a5e8b505 2163 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
e1623446 2164 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
b481de9c 2165 scale_action = -1;
77626355
BC		 2166
2167 /* No throughput measured yet for adjacent rates; try increase. */
b481de9c 2168 } else if ((low_tpt == IWL_INVALID_VALUE) &&
a5e8b505
GC		 2169 (high_tpt == IWL_INVALID_VALUE)) {
2170
2171 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2172 scale_action = 1;
2173 else if (low != IWL_RATE_INVALID)
8fe72311 2174 scale_action = 0;
a5e8b505 2175 }
77626355
BC		 2176
2177 /* Both adjacent throughputs are measured, but neither one has better
2178 * throughput; we're using the best rate, don't change it! */
b481de9c
ZY		 2179 else if ((low_tpt != IWL_INVALID_VALUE) &&
2180 (high_tpt != IWL_INVALID_VALUE) &&
2181 (low_tpt < current_tpt) &&
2182 (high_tpt < current_tpt))
2183 scale_action = 0;
77626355
BC		 2184
2185 /* At least one adjacent rate's throughput is measured,
2186 * and may have better performance. */
b481de9c 2187 else {
77626355 2188 /* Higher adjacent rate's throughput is measured */
b481de9c 2189 if (high_tpt != IWL_INVALID_VALUE) {
77626355 2190 /* Higher rate has better throughput */
a5e8b505
GC		 2191 if (high_tpt > current_tpt &&
2192 sr >= IWL_RATE_INCREASE_TH) {
b481de9c 2193 scale_action = 1;
a5e8b505 2194 } else {
8fe72311 2195 scale_action = 0;
b481de9c 2196 }
77626355
BC		 2197
2198 /* Lower adjacent rate's throughput is measured */
b481de9c 2199 } else if (low_tpt != IWL_INVALID_VALUE) {
77626355 2200 /* Lower rate has better throughput */
b481de9c 2201 if (low_tpt > current_tpt) {
e1623446
TW		 2202 IWL_DEBUG_RATE(priv,
2203 "decrease rate because of low tpt\n");
b481de9c 2204 scale_action = -1;
a5e8b505 2205 } else if (sr >= IWL_RATE_INCREASE_TH) {
b481de9c 2206 scale_action = 1;
a5e8b505 2207 }
b481de9c
ZY		 2208 }
2209 }
2210
77626355
BC		 2211 /* Sanity check; asked for decrease, but success rate or throughput
2212 * has been good at old rate. Don't change it. */
a5e8b505
GC		 2213 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2214 ((sr > IWL_RATE_HIGH_TH) ||
b481de9c 2215 (current_tpt > (100 * tbl->expected_tpt[low]))))
b481de9c 2216 scale_action = 0;
46f9381a
WYG		 2217 if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2218 scale_action = -1;
3ad3b92a 2219 if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
46f9381a
WYG		 2220 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2221 scale_action = -1;
b481de9c
ZY		 2222 switch (scale_action) {
2223 case -1:
77626355 2224 /* Decrease starting rate, update uCode's rate table */
b481de9c
ZY		 2225 if (low != IWL_RATE_INVALID) {
2226 update_lq = 1;
2227 index = low;
2228 }
447fee70 2229
b481de9c
ZY		 2230 break;
2231 case 1:
77626355 2232 /* Increase starting rate, update uCode's rate table */
b481de9c
ZY		 2233 if (high != IWL_RATE_INVALID) {
2234 update_lq = 1;
2235 index = high;
2236 }
2237
2238 break;
2239 case 0:
77626355 2240 /* No change */
b481de9c
ZY		 2241 default:
2242 break;
2243 }
2244
e1623446 2245 IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
b481de9c
ZY		 2246 "high %d type %d\n",
2247 index, scale_action, low, high, tbl->lq_type);
2248
a5e8b505 2249lq_update:
77626355 2250 /* Replace uCode's rate table for the destination station. */
e3139fe7
WYG		 2251 if (update_lq)
2252 rate = rs_update_rate_tbl(priv, lq_sta,
2253 tbl, index, is_green);
77626355 2254
3ad3b92a 2255 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
46f9381a
WYG		 2256 /* Should we stay with this modulation mode,
2257 * or search for a new one? */
2258 rs_stay_in_table(lq_sta);
2259 }
77626355
BC		 2260 /*
2261 * Search for new modulation mode if we're:
2262 * 1) Not changing rates right now
2263 * 2) Not just finishing up a search
2264 * 3) Allowing a new search
2265 */
47cfd463 2266 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
77626355 2267 /* Save current throughput to compare with "search" throughput*/
c33104f0 2268 lq_sta->last_tpt = current_tpt;
b481de9c 2269
77626355
BC		 2270 /* Select a new "search" modulation mode to try.
2271 * If one is found, set up the new "search" table. */
b481de9c 2272 if (is_legacy(tbl->lq_type))
c33104f0 2273 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
b481de9c 2274 else if (is_siso(tbl->lq_type))
c33104f0 2275 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
584a0f00
WYG		 2276 else if (is_mimo2(tbl->lq_type))
2277 rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
b481de9c 2278 else
584a0f00 2279 rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
b481de9c 2280
77626355 2281 /* If new "search" mode was selected, set up in uCode table */
c33104f0 2282 if (lq_sta->search_better_tbl) {
77626355 2283 /* Access the "search" table, clear its history. */
c33104f0 2284 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
b481de9c
ZY		 2285 for (i = 0; i < IWL_RATE_COUNT; i++)
2286 rs_rate_scale_clear_window(&(tbl->win[i]));
2287
77626355 2288 /* Use new "search" start rate */
e7d326ac 2289 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
b481de9c 2290
e1623446 2291 IWL_DEBUG_RATE(priv, "Switch current mcs: %X index: %d\n",
39e88504 2292 tbl->current_rate, index);
07bc28ed 2293 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
fe6b23dd 2294 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC, false);
447fee70
MA		 2295 } else
2296 done_search = 1;
2297 }
b481de9c 2298
447fee70 2299 if (done_search && !lq_sta->stay_in_tbl) {
77626355
BC		 2300 /* If the "active" (non-search) mode was legacy,
2301 * and we've tried switching antennas,
2302 * but we haven't been able to try HT modes (not available),
2303 * stay with best antenna legacy modulation for a while
2304 * before next round of mode comparisons. */
c33104f0 2305 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
de27e64e 2306 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
d6e93399 2307 lq_sta->action_counter > tbl1->max_search) {
e1623446 2308 IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
bf403db8 2309 rs_set_stay_in_table(priv, 1, lq_sta);
b481de9c
ZY		 2310 }
2311
77626355
BC		 2312 /* If we're in an HT mode, and all 3 mode switch actions
2313 * have been tried and compared, stay in this best modulation
2314 * mode for a while before next round of mode comparisons. */
c33104f0 2315 if (lq_sta->enable_counter &&
46f9381a
WYG		 2316 (lq_sta->action_counter >= tbl1->max_search) &&
2317 iwl_ht_enabled(priv)) {
0c11b4de
RR		 2318 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2319 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2320 (tid != MAX_TID_COUNT)) {
86b4766b
WYG		 2321 tid_data =
2322 &priv->stations[lq_sta->lq.sta_id].tid[tid];
2323 if (tid_data->agg.state == IWL_AGG_OFF) {
2324 IWL_DEBUG_RATE(priv,
2325 "try to aggregate tid %d\n",
2326 tid);
2327 rs_tl_turn_on_agg(priv, tid,
2328 lq_sta, sta);
2329 }
b481de9c 2330 }
bf403db8 2331 rs_set_stay_in_table(priv, 0, lq_sta);
b481de9c 2332 }
b481de9c
ZY		 2333 }
2334
2335out:
978785a3 2336 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
b481de9c 2337 i = index;
b7e35008 2338 lq_sta->last_txrate_idx = i;
b481de9c
ZY		 2339}
2340
fe6b23dd
RC		 2341/**
2342 * rs_initialize_lq - Initialize a station's hardware rate table
2343 *
2344 * The uCode's station table contains a table of fallback rates
2345 * for automatic fallback during transmission.
2346 *
2347 * NOTE: This sets up a default set of values. These will be replaced later
2348 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2349 * rc80211_simple.
2350 *
2351 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2352 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2353 * which requires station table entry to exist).
2354 */
c79dd5b5 2355static void rs_initialize_lq(struct iwl_priv *priv,
270243a5 2356 struct ieee80211_conf *conf,
4b7679a5
JB		 2357 struct ieee80211_sta *sta,
2358 struct iwl_lq_sta *lq_sta)
b481de9c 2359{
e227ceac 2360 struct iwl_scale_tbl_info *tbl;
b481de9c 2361 int rate_idx;
aade00ce 2362 int i;
39e88504 2363 u32 rate;
b261793d 2364 u8 use_green = rs_use_green(sta, &priv->current_ht_config);
aade00ce
GC		 2365 u8 active_tbl = 0;
2366 u8 valid_tx_ant;
b481de9c 2367
4b7679a5 2368 if (!sta || !lq_sta)
b481de9c
ZY		 2369 goto out;
2370
b7e35008 2371 i = lq_sta->last_txrate_idx;
b481de9c 2372
aade00ce
GC		 2373 valid_tx_ant = priv->hw_params.valid_tx_ant;
2374
c33104f0
TW		 2375 if (!lq_sta->search_better_tbl)
2376 active_tbl = lq_sta->active_tbl;
b481de9c 2377 else
c33104f0 2378 active_tbl = 1 - lq_sta->active_tbl;
b481de9c 2379
c33104f0 2380 tbl = &(lq_sta->lq_info[active_tbl]);
b481de9c
ZY		 2381
2382 if ((i < 0) || (i >= IWL_RATE_COUNT))
2383 i = 0;
2384
1826dcc0 2385 rate = iwl_rates[i].plcp;
eb48dcaf
WT		 2386 tbl->ant_type = first_antenna(valid_tx_ant);
2387 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
b481de9c
ZY		 2388
2389 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
39e88504 2390 rate |= RATE_MCS_CCK_MSK;
b481de9c 2391
39e88504 2392 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
aade00ce
GC		 2393 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2394 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
b481de9c 2395
978785a3 2396 rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
39e88504 2397 tbl->current_rate = rate;
eecd6e57 2398 rs_set_expected_tpt_table(lq_sta, tbl);
07bc28ed 2399 rs_fill_link_cmd(NULL, lq_sta, rate);
fe6b23dd
RC		 2400 priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2401 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_SYNC, true);
b481de9c
ZY		 2402 out:
2403 return;
2404}
2405
e6a9854b
JB		 2406static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2407 struct ieee80211_tx_rate_control *txrc)
b481de9c
ZY		 2408{
2409
e6a9854b
JB		 2410 struct sk_buff *skb = txrc->skb;
2411 struct ieee80211_supported_band *sband = txrc->sband;
f875f518 2412 struct iwl_priv *priv __maybe_unused = (struct iwl_priv *)priv_r;
e6a9854b 2413 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
417f114b
TW		 2414 struct iwl_lq_sta *lq_sta = priv_sta;
2415 int rate_idx;
b481de9c 2416
e1623446 2417 IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
b481de9c 2418
c6ec7a9b
AM		 2419 /* Get max rate if user set max rate */
2420 if (lq_sta) {
2421 lq_sta->max_rate_idx = txrc->max_rate_idx;
2422 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2423 (lq_sta->max_rate_idx != -1))
2424 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2425 if ((lq_sta->max_rate_idx < 0) ||
2426 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2427 lq_sta->max_rate_idx = -1;
2428 }
2429
fe6b23dd
RC		 2430 /* Treat uninitialized rate scaling data same as non-existing. */
2431 if (lq_sta && !lq_sta->drv) {
2432 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
2433 priv_sta = NULL;
2434 }
2435
514d65c1 2436 /* Send management frames and NO_ACK data using lowest rate. */
4c6d4f5c 2437 if (rate_control_send_low(sta, priv_sta, txrc))
4b7679a5 2438 return;
b481de9c 2439
417f114b 2440 rate_idx = lq_sta->last_txrate_idx;
b481de9c 2441
a9c146b3 2442 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
417f114b 2443 rate_idx -= IWL_FIRST_OFDM_RATE;
a9c146b3
WYG		 2444 /* 6M and 9M shared same MCS index */
2445 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2446 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2447 IWL_RATE_MIMO3_6M_PLCP)
2448 rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2449 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2450 IWL_RATE_MIMO2_6M_PLCP)
2451 rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2452 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2453 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2454 info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2455 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2456 info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
7aafef1c 2457 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
a9c146b3
WYG		 2458 info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2459 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2460 info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2461 } else {
5027309b
DH		 2462 /* Check for invalid rates */
2463 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2464 ((sband->band == IEEE80211_BAND_5GHZ) &&
2465 (rate_idx < IWL_FIRST_OFDM_RATE)))
a9c146b3 2466 rate_idx = rate_lowest_index(sband, sta);
5027309b 2467 /* On valid 5 GHz rate, adjust index */
a9c146b3
WYG		 2468 else if (sband->band == IEEE80211_BAND_5GHZ)
2469 rate_idx -= IWL_FIRST_OFDM_RATE;
7ebaeff8 2470 info->control.rates[0].flags = 0;
a9c146b3 2471 }
417f114b 2472 info->control.rates[0].idx = rate_idx;
a9c146b3 2473
b481de9c
ZY		 2474}
2475
4b7679a5
JB		 2476static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2477 gfp_t gfp)
b481de9c 2478{
e227ceac 2479 struct iwl_lq_sta *lq_sta;
8d9698b3 2480 struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv;
bf403db8 2481 struct iwl_priv *priv;
b481de9c 2482
bf403db8 2483 priv = (struct iwl_priv *)priv_rate;
e1623446 2484 IWL_DEBUG_RATE(priv, "create station rate scale window\n");
b481de9c 2485
8d9698b3 2486 lq_sta = &sta_priv->lq_sta;
b481de9c 2487
c33104f0 2488 return lq_sta;
b481de9c
ZY		 2489}
2490
fe6b23dd
RC		 2491/*
2492 * Called after adding a new station to initialize rate scaling
2493 */
2494void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id)
b481de9c
ZY		 2495{
2496 int i, j;
fe6b23dd 2497 struct ieee80211_hw *hw = priv->hw;
4b7679a5 2498 struct ieee80211_conf *conf = &priv->hw->conf;
7869b0ea 2499 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
fe6b23dd
RC		 2500 struct iwl_station_priv *sta_priv;
2501 struct iwl_lq_sta *lq_sta;
2502 struct ieee80211_supported_band *sband;
2503
2504 sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2505 lq_sta = &sta_priv->lq_sta;
2506 sband = hw->wiphy->bands[conf->channel->band];
b481de9c 2507
fe6b23dd
RC		 2508
2509 lq_sta->lq.sta_id = sta_id;
5ad13f8c
RC		 2510
2511 for (j = 0; j < LQ_SIZE; j++)
2512 for (i = 0; i < IWL_RATE_COUNT; i++)
2513 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2514
c33104f0 2515 lq_sta->flush_timer = 0;
4b7679a5 2516 lq_sta->supp_rates = sta->supp_rates[sband->band];
b481de9c
ZY		 2517 for (j = 0; j < LQ_SIZE; j++)
2518 for (i = 0; i < IWL_RATE_COUNT; i++)
3ac7f146 2519 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
b481de9c 2520
fe6b23dd
RC		 2521 IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n",
2522 sta_id);
b481de9c
ZY		 2523 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2524 * the lowest or the highest rate.. Could consider using RSSI from
2525 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2526 * after assoc.. */
2527
c33104f0 2528 lq_sta->is_dup = 0;
c6ec7a9b 2529 lq_sta->max_rate_idx = -1;
7d049e5a 2530 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
b261793d 2531 lq_sta->is_green = rs_use_green(sta, &priv->current_ht_config);
39e88504 2532 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
8318d78a 2533 lq_sta->band = priv->band;
77626355
BC		 2534 /*
2535 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2536 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2537 */
7869b0ea
DH		 2538 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2539 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
c33104f0 2540 lq_sta->active_siso_rate &= ~((u16)0x2);
fde0db31 2541 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
b481de9c 2542
77626355 2543 /* Same here */
7869b0ea
DH		 2544 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2545 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
fde0db31
GC		 2546 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2547 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2548
7869b0ea
DH		 2549 lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2550 lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
fde0db31
GC		 2551 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2552 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2553
e1623446 2554 IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
c33104f0 2555 lq_sta->active_siso_rate,
fde0db31
GC		 2556 lq_sta->active_mimo2_rate,
2557 lq_sta->active_mimo3_rate);
2558
a96a27f9 2559 /* These values will be overridden later */
3a23d695
WYG		 2560 lq_sta->lq.general_params.single_stream_ant_msk =
2561 first_antenna(priv->hw_params.valid_tx_ant);
2562 lq_sta->lq.general_params.dual_stream_ant_msk =
2563 priv->hw_params.valid_tx_ant &
2564 ~first_antenna(priv->hw_params.valid_tx_ant);
2565 if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2566 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2567 } else if (num_of_ant(priv->hw_params.valid_tx_ant) == 2) {
2568 lq_sta->lq.general_params.dual_stream_ant_msk =
2569 priv->hw_params.valid_tx_ant;
2570 }
07bc28ed 2571
0c11b4de
RR		 2572 /* as default allow aggregation for all tids */
2573 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
c33104f0 2574 lq_sta->drv = priv;
b481de9c 2575
5027309b
DH		 2576 /* Set last_txrate_idx to lowest rate */
2577 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2578 if (sband->band == IEEE80211_BAND_5GHZ)
2579 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
e3949d62 2580 lq_sta->is_agg = 0;
d5e49036 2581
4b7679a5 2582 rs_initialize_lq(priv, conf, sta, lq_sta);
b481de9c
ZY		 2583}
2584
46f9381a 2585static void rs_fill_link_cmd(struct iwl_priv *priv,
e227ceac 2586 struct iwl_lq_sta *lq_sta, u32 new_rate)
b481de9c 2587{
e227ceac 2588 struct iwl_scale_tbl_info tbl_type;
b481de9c 2589 int index = 0;
b481de9c 2590 int rate_idx;
1b696de2 2591 int repeat_rate = 0;
aade00ce 2592 u8 ant_toggle_cnt = 0;
b481de9c 2593 u8 use_ht_possible = 1;
aade00ce 2594 u8 valid_tx_ant = 0;
07bc28ed 2595 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
b481de9c 2596
77626355 2597 /* Override starting rate (index 0) if needed for debug purposes */
39e88504 2598 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
98d7e09a 2599
39e88504 2600 /* Interpret new_rate (rate_n_flags) */
aade00ce 2601 memset(&tbl_type, 0, sizeof(tbl_type));
39e88504 2602 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
b481de9c
ZY		 2603 &tbl_type, &rate_idx);
2604
77626355 2605 /* How many times should we repeat the initial rate? */
b481de9c 2606 if (is_legacy(tbl_type.lq_type)) {
aade00ce 2607 ant_toggle_cnt = 1;
1b696de2 2608 repeat_rate = IWL_NUMBER_TRY;
aade00ce 2609 } else {
1b696de2 2610 repeat_rate = IWL_HT_NUMBER_TRY;
aade00ce 2611 }
b481de9c
ZY		 2612
2613 lq_cmd->general_params.mimo_delimiter =
2614 is_mimo(tbl_type.lq_type) ? 1 : 0;
77626355
BC		 2615
2616 /* Fill 1st table entry (index 0) */
39e88504 2617 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
b481de9c 2618
07bc28ed
GC		 2619 if (num_of_ant(tbl_type.ant_type) == 1) {
2620 lq_cmd->general_params.single_stream_ant_msk =
2621 tbl_type.ant_type;
2622 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2623 lq_cmd->general_params.dual_stream_ant_msk =
2624 tbl_type.ant_type;
2625 } /* otherwise we don't modify the existing value */
b481de9c
ZY		 2626
2627 index++;
1b696de2 2628 repeat_rate--;
b481de9c 2629
aade00ce
GC		 2630 if (priv)
2631 valid_tx_ant = priv->hw_params.valid_tx_ant;
2632
77626355 2633 /* Fill rest of rate table */
b481de9c 2634 while (index < LINK_QUAL_MAX_RETRY_NUM) {
77626355
BC		 2635 /* Repeat initial/next rate.
2636 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2637 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
1b696de2 2638 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
b481de9c 2639 if (is_legacy(tbl_type.lq_type)) {
aade00ce
GC		 2640 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2641 ant_toggle_cnt++;
2642 else if (priv &&
2643 rs_toggle_antenna(valid_tx_ant,
2644 &new_rate, &tbl_type))
2645 ant_toggle_cnt = 1;
2646}
98d7e09a 2647
77626355 2648 /* Override next rate if needed for debug purposes */
c33104f0 2649 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
77626355
BC		 2650
2651 /* Fill next table entry */
b481de9c 2652 lq_cmd->rs_table[index].rate_n_flags =
39e88504 2653 cpu_to_le32(new_rate);
1b696de2 2654 repeat_rate--;
b481de9c
ZY		 2655 index++;
2656 }
2657
39e88504 2658 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
b481de9c
ZY		 2659 &rate_idx);
2660
77626355
BC		 2661 /* Indicate to uCode which entries might be MIMO.
2662 * If initial rate was MIMO, this will finally end up
2663 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
b481de9c
ZY		 2664 if (is_mimo(tbl_type.lq_type))
2665 lq_cmd->general_params.mimo_delimiter = index;
2666
77626355 2667 /* Get next rate */
39e88504
GC		 2668 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2669 use_ht_possible);
b481de9c 2670
77626355 2671 /* How many times should we repeat the next rate? */
b481de9c 2672 if (is_legacy(tbl_type.lq_type)) {
aade00ce
GC		 2673 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2674 ant_toggle_cnt++;
2675 else if (priv &&
2676 rs_toggle_antenna(valid_tx_ant,
2677 &new_rate, &tbl_type))
2678 ant_toggle_cnt = 1;
2679
1b696de2 2680 repeat_rate = IWL_NUMBER_TRY;
aade00ce 2681 } else {
1b696de2 2682 repeat_rate = IWL_HT_NUMBER_TRY;
aade00ce 2683 }
b481de9c 2684
77626355
BC		 2685 /* Don't allow HT rates after next pass.
2686 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
b481de9c
ZY		 2687 use_ht_possible = 0;
2688
77626355 2689 /* Override next rate if needed for debug purposes */
c33104f0 2690 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
77626355
BC		 2691
2692 /* Fill next table entry */
39e88504 2693 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
b481de9c
ZY		 2694
2695 index++;
1b696de2 2696 repeat_rate--;
b481de9c
ZY		 2697 }
2698
4d80d721 2699 lq_cmd->agg_params.agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
13c33a09
WYG		 2700 lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2701 lq_cmd->agg_params.agg_time_limit =
2702 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
b481de9c
ZY		 2703}
2704
4b7679a5 2705static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
b481de9c 2706{
4b7679a5 2707 return hw->priv;
b481de9c
ZY		 2708}
2709/* rate scale requires free function to be implemented */
2710static void rs_free(void *priv_rate)
2711{
2712 return;
2713}
2714
4b7679a5
JB		 2715static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
2716 void *priv_sta)
b481de9c 2717{
45527c2c 2718 struct iwl_priv *priv __maybe_unused = priv_r;
b481de9c 2719
e1623446 2720 IWL_DEBUG_RATE(priv, "enter\n");
e1623446 2721 IWL_DEBUG_RATE(priv, "leave\n");
b481de9c
ZY		 2722}
2723
2724
93dc646a 2725#ifdef CONFIG_MAC80211_DEBUGFS
5ae212c9
ZY		 2726static int open_file_generic(struct inode *inode, struct file *file)
2727{
2728 file->private_data = inode->i_private;
2729 return 0;
2730}
e227ceac
TW		 2731static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2732 u32 *rate_n_flags, int index)
98d7e09a 2733{
bf403db8 2734 struct iwl_priv *priv;
3c4955f8
WYG		 2735 u8 valid_tx_ant;
2736 u8 ant_sel_tx;
bf403db8
EK		 2737
2738 priv = lq_sta->drv;
3c4955f8 2739 valid_tx_ant = priv->hw_params.valid_tx_ant;
39e88504 2740 if (lq_sta->dbg_fixed_rate) {
3c4955f8
WYG		 2741 ant_sel_tx =
2742 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
2743 >> RATE_MCS_ANT_POS);
2744 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
39e88504 2745 *rate_n_flags = lq_sta->dbg_fixed_rate;
3c4955f8 2746 IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
39e88504 2747 } else {
3c4955f8
WYG		 2748 lq_sta->dbg_fixed_rate = 0;
2749 IWL_ERR(priv,
2750 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
2751 ant_sel_tx, valid_tx_ant);
2752 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
39e88504 2753 }
39e88504 2754 } else {
e1623446 2755 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
98d7e09a 2756 }
98d7e09a 2757}
5ae212c9 2758
98d7e09a
ZY		 2759static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2760 const char __user *user_buf, size_t count, loff_t *ppos)
2761{
e227ceac 2762 struct iwl_lq_sta *lq_sta = file->private_data;
bf403db8 2763 struct iwl_priv *priv;
98d7e09a
ZY		 2764 char buf[64];
2765 int buf_size;
2766 u32 parsed_rate;
2767
bf403db8 2768 priv = lq_sta->drv;
98d7e09a
ZY		 2769 memset(buf, 0, sizeof(buf));
2770 buf_size = min(count, sizeof(buf) - 1);
2771 if (copy_from_user(buf, user_buf, buf_size))
2772 return -EFAULT;
2773
2774 if (sscanf(buf, "%x", &parsed_rate) == 1)
39e88504 2775 lq_sta->dbg_fixed_rate = parsed_rate;
98d7e09a 2776 else
39e88504 2777 lq_sta->dbg_fixed_rate = 0;
98d7e09a 2778
39e88504
GC		 2779 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2780 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2781 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2782 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
98d7e09a 2783
e1623446 2784 IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
39e88504 2785 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
98d7e09a 2786
39e88504 2787 if (lq_sta->dbg_fixed_rate) {
07bc28ed 2788 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
fe6b23dd 2789 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC, false);
98d7e09a
ZY		 2790 }
2791
2792 return count;
2793}
0209dc11 2794
5ae212c9
ZY		 2795static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2796 char __user *user_buf, size_t count, loff_t *ppos)
2797{
a412c804 2798 char *buff;
5ae212c9
ZY		 2799 int desc = 0;
2800 int i = 0;
12b96817 2801 int index = 0;
a412c804 2802 ssize_t ret;
5ae212c9 2803
e227ceac 2804 struct iwl_lq_sta *lq_sta = file->private_data;
d8ae4f52 2805 struct iwl_priv *priv;
adb7b5e6 2806 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
5ae212c9 2807
d8ae4f52 2808 priv = lq_sta->drv;
a412c804
FS		 2809 buff = kmalloc(1024, GFP_KERNEL);
2810 if (!buff)
2811 return -ENOMEM;
2812
c33104f0 2813 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
98d7e09a 2814 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
c33104f0 2815 lq_sta->total_failed, lq_sta->total_success,
39e88504 2816 lq_sta->active_legacy_rate);
98d7e09a 2817 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
39e88504 2818 lq_sta->dbg_fixed_rate);
d8ae4f52
WYG		 2819 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
2820 (priv->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
2821 (priv->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
2822 (priv->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
adb7b5e6
WYG		 2823 desc += sprintf(buff+desc, "lq type %s\n",
2824 (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
2825 if (is_Ht(tbl->lq_type)) {
2826 desc += sprintf(buff+desc, " %s",
2827 (is_siso(tbl->lq_type)) ? "SISO" :
2828 ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
2829 desc += sprintf(buff+desc, " %s",
7aafef1c 2830 (tbl->is_ht40) ? "40MHz" : "20MHz");
e3949d62
DH		 2831 desc += sprintf(buff+desc, " %s %s %s\n", (tbl->is_SGI) ? "SGI" : "",
2832 (lq_sta->is_green) ? "GF enabled" : "",
2833 (lq_sta->is_agg) ? "AGG on" : "");
adb7b5e6 2834 }
12b96817
WYG		 2835 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
2836 lq_sta->last_rate_n_flags);
5ae212c9
ZY		 2837 desc += sprintf(buff+desc, "general:"
2838 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
c33104f0
TW		 2839 lq_sta->lq.general_params.flags,
2840 lq_sta->lq.general_params.mimo_delimiter,
2841 lq_sta->lq.general_params.single_stream_ant_msk,
2842 lq_sta->lq.general_params.dual_stream_ant_msk);
5ae212c9
ZY		 2843
2844 desc += sprintf(buff+desc, "agg:"
2845 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
c33104f0
TW		 2846 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2847 lq_sta->lq.agg_params.agg_dis_start_th,
2848 lq_sta->lq.agg_params.agg_frame_cnt_limit);
5ae212c9
ZY		 2849
2850 desc += sprintf(buff+desc,
2851 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
c33104f0
TW		 2852 lq_sta->lq.general_params.start_rate_index[0],
2853 lq_sta->lq.general_params.start_rate_index[1],
2854 lq_sta->lq.general_params.start_rate_index[2],
2855 lq_sta->lq.general_params.start_rate_index[3]);
5ae212c9 2856
12b96817
WYG		 2857 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2858 index = iwl_hwrate_to_plcp_idx(
2859 le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2860 if (is_legacy(tbl->lq_type)) {
2861 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
2862 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
2863 iwl_rate_mcs[index].mbps);
2864 } else {
2865 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
2866 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
2867 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
2868 }
2869 }
5ae212c9 2870
a412c804
FS		 2871 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2872 kfree(buff);
2873 return ret;
5ae212c9
ZY		 2874}
2875
2876static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
98d7e09a 2877 .write = rs_sta_dbgfs_scale_table_write,
5ae212c9
ZY		 2878 .read = rs_sta_dbgfs_scale_table_read,
2879 .open = open_file_generic,
2880};
0209dc11
ZY		 2881static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2882 char __user *user_buf, size_t count, loff_t *ppos)
2883{
a412c804 2884 char *buff;
0209dc11
ZY		 2885 int desc = 0;
2886 int i, j;
a412c804 2887 ssize_t ret;
0209dc11 2888
e227ceac 2889 struct iwl_lq_sta *lq_sta = file->private_data;
a412c804
FS		 2890
2891 buff = kmalloc(1024, GFP_KERNEL);
2892 if (!buff)
2893 return -ENOMEM;
2894
0209dc11 2895 for (i = 0; i < LQ_SIZE; i++) {
7aafef1c
WYG		 2896 desc += sprintf(buff+desc,
2897 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
0209dc11 2898 "rate=0x%X\n",
c3056065 2899 lq_sta->active_tbl == i ? "*" : "x",
c33104f0
TW		 2900 lq_sta->lq_info[i].lq_type,
2901 lq_sta->lq_info[i].is_SGI,
7aafef1c 2902 lq_sta->lq_info[i].is_ht40,
c33104f0 2903 lq_sta->lq_info[i].is_dup,
2681b20b 2904 lq_sta->is_green,
39e88504 2905 lq_sta->lq_info[i].current_rate);
0209dc11
ZY		 2906 for (j = 0; j < IWL_RATE_COUNT; j++) {
2907 desc += sprintf(buff+desc,
c33104f0
TW		 2908 "counter=%d success=%d %%=%d\n",
2909 lq_sta->lq_info[i].win[j].counter,
2910 lq_sta->lq_info[i].win[j].success_counter,
2911 lq_sta->lq_info[i].win[j].success_ratio);
0209dc11
ZY		 2912 }
2913 }
a412c804
FS		 2914 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2915 kfree(buff);
2916 return ret;
0209dc11
ZY		 2917}
2918
2919static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2920 .read = rs_sta_dbgfs_stats_table_read,
2921 .open = open_file_generic,
2922};
5ae212c9 2923
38167459
WYG		 2924static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
2925 char __user *user_buf, size_t count, loff_t *ppos)
2926{
2927 char buff[120];
2928 int desc = 0;
2929 ssize_t ret;
2930
2931 struct iwl_lq_sta *lq_sta = file->private_data;
2932 struct iwl_priv *priv;
2933 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
2934
2935 priv = lq_sta->drv;
2936
2937 if (is_Ht(tbl->lq_type))
2938 desc += sprintf(buff+desc,
2939 "Bit Rate= %d Mb/s\n",
2940 tbl->expected_tpt[lq_sta->last_txrate_idx]);
2941 else
2942 desc += sprintf(buff+desc,
2943 "Bit Rate= %d Mb/s\n",
2944 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
38167459
WYG		 2945
2946 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2947 return ret;
2948}
2949
2950static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
2951 .read = rs_sta_dbgfs_rate_scale_data_read,
2952 .open = open_file_generic,
2953};
2954
93dc646a
ZY		 2955static void rs_add_debugfs(void *priv, void *priv_sta,
2956 struct dentry *dir)
2957{
e227ceac 2958 struct iwl_lq_sta *lq_sta = priv_sta;
c33104f0 2959 lq_sta->rs_sta_dbgfs_scale_table_file =
43e85115 2960 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
c33104f0
TW		 2961 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2962 lq_sta->rs_sta_dbgfs_stats_table_file =
43e85115 2963 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
c33104f0 2964 lq_sta, &rs_sta_dbgfs_stats_table_ops);
38167459 2965 lq_sta->rs_sta_dbgfs_rate_scale_data_file =
43e85115 2966 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
38167459 2967 lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
0c11b4de 2968 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
43e85115 2969 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
0c11b4de 2970 &lq_sta->tx_agg_tid_en);
0c11b4de 2971
93dc646a
ZY		 2972}
2973
2974static void rs_remove_debugfs(void *priv, void *priv_sta)
2975{
e227ceac 2976 struct iwl_lq_sta *lq_sta = priv_sta;
c33104f0
TW		 2977 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2978 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
38167459 2979 debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
0c11b4de 2980 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
93dc646a
ZY		 2981}
2982#endif
2983
fe6b23dd
RC		 2984/*
2985 * Initialization of rate scaling information is done by driver after
2986 * the station is added. Since mac80211 calls this function before a
2987 * station is added we ignore it.
2988 */
2989static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband,
2990 struct ieee80211_sta *sta, void *priv_sta)
2991{
2992}
b481de9c
ZY		 2993static struct rate_control_ops rs_ops = {
2994 .module = NULL,
2995 .name = RS_NAME,
2996 .tx_status = rs_tx_status,
2997 .get_rate = rs_get_rate,
fe6b23dd 2998 .rate_init = rs_rate_init_stub,
b481de9c
ZY		 2999 .alloc = rs_alloc,
3000 .free = rs_free,
3001 .alloc_sta = rs_alloc_sta,
3002 .free_sta = rs_free_sta,
93dc646a
ZY		 3003#ifdef CONFIG_MAC80211_DEBUGFS
3004 .add_sta_debugfs = rs_add_debugfs,
3005 .remove_sta_debugfs = rs_remove_debugfs,
3006#endif
b481de9c
ZY		 3007};
3008
e227ceac 3009int iwlagn_rate_control_register(void)
b481de9c 3010{
897e1cf2 3011 return ieee80211_rate_control_register(&rs_ops);
b481de9c
ZY		 3012}
3013
e227ceac 3014void iwlagn_rate_control_unregister(void)
b481de9c
ZY		 3015{
3016 ieee80211_rate_control_unregister(&rs_ops);
3017}
3018
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