]> bbs.cooldavid.org Git - net-next-2.6.git/blame - drivers/net/wireless/iwlwifi/iwl-agn-rs.c
git://bbs.cooldavid.org / net-next-2.6.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Merge branch 'master' of /repos/git/net-next-2.6
[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);
82ca9341 316 ieee80211_stop_tx_ba_session(sta, tid,
45d42700
WYG		 317 WLAN_BACK_INITIATOR);
318 }
82ca9341
WYG		 319 } else
320 IWL_ERR(priv, "Fail finding valid aggregation tid: %d\n", tid);
321 return ret;
0c11b4de
RR		 322}
323
c79dd5b5 324static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
e227ceac 325 struct iwl_lq_sta *lq_data,
4b7679a5 326 struct ieee80211_sta *sta)
0c11b4de 327{
82ca9341
WYG		 328 if ((tid < TID_MAX_LOAD_COUNT) &&
329 !rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta)) {
330 if (priv->cfg->use_rts_for_ht) {
331 /*
332 * switch to RTS/CTS if it is the prefer protection
333 * method for HT traffic
334 */
335 IWL_DEBUG_HT(priv, "use RTS/CTS protection for HT\n");
336 priv->staging_rxon.flags &= ~RXON_FLG_SELF_CTS_EN;
337 iwlcore_commit_rxon(priv);
338 }
47eef9bd 339 }
0c11b4de
RR		 340}
341
39e88504 342static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
fde0db31 343{
3ac7f146
TW		 344 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
345 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
346 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
fde0db31
GC		 347}
348
04f2dec1
SZ		 349/*
350 * Static function to get the expected throughput from an iwl_scale_tbl_info
351 * that wraps a NULL pointer check
352 */
353static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
354{
355 if (tbl->expected_tpt)
356 return tbl->expected_tpt[rs_index];
357 return 0;
358}
359
77626355
BC		 360/**
361 * rs_collect_tx_data - Update the success/failure sliding window
362 *
363 * We keep a sliding window of the last 62 packets transmitted
364 * at this rate. window->data contains the bitmask of successful
365 * packets.
366 */
04f2dec1
SZ		 367static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
368 int scale_index, int attempts, int successes)
b481de9c 369{
e227ceac 370 struct iwl_rate_scale_data *window = NULL;
39e88504 371 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
04f2dec1 372 s32 fail_count, tpt;
b481de9c 373
dc2453ae
TW		 374 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
375 return -EINVAL;
b481de9c 376
e3949d62 377 /* Select window for current tx bit rate */
04f2dec1
SZ		 378 window = &(tbl->win[scale_index]);
379
380 /* Get expected throughput */
381 tpt = get_expected_tpt(tbl, scale_index);
b481de9c 382
77626355
BC		 383 /*
384 * Keep track of only the latest 62 tx frame attempts in this rate's
385 * history window; anything older isn't really relevant any more.
386 * If we have filled up the sliding window, drop the oldest attempt;
387 * if the oldest attempt (highest bit in bitmap) shows "success",
388 * subtract "1" from the success counter (this is the main reason
389 * we keep these bitmaps!).
390 */
e3949d62 391 while (attempts > 0) {
39e88504
GC		 392 if (window->counter >= IWL_RATE_MAX_WINDOW) {
393
394 /* remove earliest */
395 window->counter = IWL_RATE_MAX_WINDOW - 1;
396
99556438
RR		 397 if (window->data & mask) {
398 window->data &= ~mask;
39e88504 399 window->success_counter--;
99556438 400 }
b481de9c 401 }
b481de9c 402
99556438
RR		 403 /* Increment frames-attempted counter */
404 window->counter++;
405
e3949d62 406 /* Shift bitmap by one frame to throw away oldest history */
90d7795e 407 window->data <<= 1;
e3949d62
DH		 408
409 /* Mark the most recent #successes attempts as successful */
99556438 410 if (successes > 0) {
39e88504 411 window->success_counter++;
99556438
RR		 412 window->data |= 0x1;
413 successes--;
414 }
77626355 415
e3949d62 416 attempts--;
b481de9c
ZY		 417 }
418
77626355 419 /* Calculate current success ratio, avoid divide-by-0! */
b481de9c
ZY		 420 if (window->counter > 0)
421 window->success_ratio = 128 * (100 * window->success_counter)
422 / window->counter;
423 else
424 window->success_ratio = IWL_INVALID_VALUE;
425
426 fail_count = window->counter - window->success_counter;
427
77626355 428 /* Calculate average throughput, if we have enough history. */
b481de9c
ZY		 429 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
430 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
431 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
432 else
433 window->average_tpt = IWL_INVALID_VALUE;
434
77626355 435 /* Tag this window as having been updated */
b481de9c
ZY		 436 window->stamp = jiffies;
437
dc2453ae 438 return 0;
b481de9c
ZY		 439}
440
77626355
BC		 441/*
442 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
443 */
39e88504 444/* FIXME:RS:remove this function and put the flags statically in the table */
978785a3
TW		 445static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
446 struct iwl_scale_tbl_info *tbl,
447 int index, u8 use_green)
b481de9c 448{
39e88504
GC		 449 u32 rate_n_flags = 0;
450
b481de9c 451 if (is_legacy(tbl->lq_type)) {
1826dcc0 452 rate_n_flags = iwl_rates[index].plcp;
b481de9c 453 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
39e88504 454 rate_n_flags |= RATE_MCS_CCK_MSK;
b481de9c 455
fde0db31
GC		 456 } else if (is_Ht(tbl->lq_type)) {
457 if (index > IWL_LAST_OFDM_RATE) {
978785a3 458 IWL_ERR(priv, "Invalid HT rate index %d\n", index);
b481de9c 459 index = IWL_LAST_OFDM_RATE;
fde0db31 460 }
39e88504 461 rate_n_flags = RATE_MCS_HT_MSK;
fde0db31
GC		 462
463 if (is_siso(tbl->lq_type))
1826dcc0 464 rate_n_flags |= iwl_rates[index].plcp_siso;
fde0db31 465 else if (is_mimo2(tbl->lq_type))
1826dcc0 466 rate_n_flags |= iwl_rates[index].plcp_mimo2;
fde0db31 467 else
1826dcc0 468 rate_n_flags |= iwl_rates[index].plcp_mimo3;
b481de9c 469 } else {
978785a3 470 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
b481de9c
ZY		 471 }
472
39e88504 473 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
fde0db31 474 RATE_MCS_ANT_ABC_MSK);
b481de9c 475
39e88504 476 if (is_Ht(tbl->lq_type)) {
7aafef1c 477 if (tbl->is_ht40) {
39e88504
GC		 478 if (tbl->is_dup)
479 rate_n_flags |= RATE_MCS_DUP_MSK;
480 else
7aafef1c 481 rate_n_flags |= RATE_MCS_HT40_MSK;
39e88504
GC		 482 }
483 if (tbl->is_SGI)
484 rate_n_flags |= RATE_MCS_SGI_MSK;
485
486 if (use_green) {
487 rate_n_flags |= RATE_MCS_GF_MSK;
488 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
489 rate_n_flags &= ~RATE_MCS_SGI_MSK;
978785a3 490 IWL_ERR(priv, "GF was set with SGI:SISO\n");
39e88504
GC		 491 }
492 }
b481de9c 493 }
39e88504 494 return rate_n_flags;
b481de9c
ZY		 495}
496
77626355
BC		 497/*
498 * Interpret uCode API's rate_n_flags format,
499 * fill "search" or "active" tx mode table.
500 */
39e88504 501static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
8318d78a 502 enum ieee80211_band band,
e227ceac 503 struct iwl_scale_tbl_info *tbl,
b481de9c
ZY		 504 int *rate_idx)
505{
39e88504
GC		 506 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
507 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
508 u8 mcs;
b481de9c 509
e7d326ac 510 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
b481de9c 511
fde0db31 512 if (*rate_idx == IWL_RATE_INVALID) {
b481de9c 513 *rate_idx = -1;
dc2453ae 514 return -EINVAL;
b481de9c 515 }
77626355 516 tbl->is_SGI = 0; /* default legacy setup */
7aafef1c 517 tbl->is_ht40 = 0;
b481de9c 518 tbl->is_dup = 0;
fde0db31
GC		 519 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
520 tbl->lq_type = LQ_NONE;
d6e93399 521 tbl->max_search = IWL_MAX_SEARCH;
b481de9c 522
77626355 523 /* legacy rate format */
39e88504 524 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
fde0db31 525 if (num_of_ant == 1) {
8318d78a 526 if (band == IEEE80211_BAND_5GHZ)
b481de9c
ZY		 527 tbl->lq_type = LQ_A;
528 else
529 tbl->lq_type = LQ_G;
b481de9c 530 }
fde0db31 531 /* HT rate format */
b481de9c 532 } else {
39e88504 533 if (rate_n_flags & RATE_MCS_SGI_MSK)
b481de9c
ZY		 534 tbl->is_SGI = 1;
535
7aafef1c 536 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
39e88504 537 (rate_n_flags & RATE_MCS_DUP_MSK))
7aafef1c 538 tbl->is_ht40 = 1;
b481de9c 539
39e88504 540 if (rate_n_flags & RATE_MCS_DUP_MSK)
b481de9c 541 tbl->is_dup = 1;
fde0db31 542
39e88504 543 mcs = rs_extract_rate(rate_n_flags);
fde0db31 544
39e88504
GC		 545 /* SISO */
546 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
fde0db31
GC		 547 if (num_of_ant == 1)
548 tbl->lq_type = LQ_SISO; /*else NONE*/
549 /* MIMO2 */
39e88504 550 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
fde0db31
GC		 551 if (num_of_ant == 2)
552 tbl->lq_type = LQ_MIMO2;
553 /* MIMO3 */
554 } else {
d6e93399
MA		 555 if (num_of_ant == 3) {
556 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
fde0db31 557 tbl->lq_type = LQ_MIMO3;
d6e93399 558 }
fde0db31 559 }
b481de9c
ZY		 560 }
561 return 0;
562}
aade00ce
GC		 563
564/* switch to another antenna/antennas and return 1 */
565/* if no other valid antenna found, return 0 */
566static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
e227ceac 567 struct iwl_scale_tbl_info *tbl)
b481de9c 568{
aade00ce
GC		 569 u8 new_ant_type;
570
571 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
572 return 0;
573
574 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
575 return 0;
576
577 new_ant_type = ant_toggle_lookup[tbl->ant_type];
578
579 while ((new_ant_type != tbl->ant_type) &&
580 !rs_is_valid_ant(valid_ant, new_ant_type))
581 new_ant_type = ant_toggle_lookup[new_ant_type];
582
583 if (new_ant_type == tbl->ant_type)
584 return 0;
585
586 tbl->ant_type = new_ant_type;
587 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
588 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
589 return 1;
b481de9c
ZY		 590}
591
b261793d
DH		 592/**
593 * Green-field mode is valid if the station supports it and
594 * there are no non-GF stations present in the BSS.
595 */
596static inline u8 rs_use_green(struct ieee80211_sta *sta,
fad95bf5 597 struct iwl_ht_config *ht_conf)
b481de9c 598{
b261793d
DH		 599 return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
600 !(ht_conf->non_GF_STA_present);
b481de9c
ZY		 601}
602
603/**
604 * rs_get_supported_rates - get the available rates
605 *
606 * if management frame or broadcast frame only return
607 * basic available rates.
608 *
609 */
e227ceac
TW		 610static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
611 struct ieee80211_hdr *hdr,
612 enum iwl_table_type rate_type)
b481de9c 613{
eecd6e57
GC		 614 if (is_legacy(rate_type)) {
615 return lq_sta->active_legacy_rate;
616 } else {
b481de9c 617 if (is_siso(rate_type))
eecd6e57 618 return lq_sta->active_siso_rate;
fde0db31 619 else if (is_mimo2(rate_type))
eecd6e57 620 return lq_sta->active_mimo2_rate;
b481de9c 621 else
eecd6e57 622 return lq_sta->active_mimo3_rate;
c33104f0 623 }
b481de9c
ZY		 624}
625
bf403db8
EK		 626static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
627 int rate_type)
b481de9c
ZY		 628{
629 u8 high = IWL_RATE_INVALID;
630 u8 low = IWL_RATE_INVALID;
631
01ebd063 632 /* 802.11A or ht walks to the next literal adjacent rate in
b481de9c
ZY		 633 * the rate table */
634 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
635 int i;
636 u32 mask;
637
638 /* Find the previous rate that is in the rate mask */
639 i = index - 1;
640 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
641 if (rate_mask & mask) {
642 low = i;
643 break;
644 }
645 }
646
647 /* Find the next rate that is in the rate mask */
648 i = index + 1;
649 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
650 if (rate_mask & mask) {
651 high = i;
652 break;
653 }
654 }
655
656 return (high << 8) | low;
657 }
658
659 low = index;
660 while (low != IWL_RATE_INVALID) {
1826dcc0 661 low = iwl_rates[low].prev_rs;
b481de9c
ZY		 662 if (low == IWL_RATE_INVALID)
663 break;
664 if (rate_mask & (1 << low))
665 break;
e1623446 666 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
b481de9c
ZY		 667 }
668
669 high = index;
670 while (high != IWL_RATE_INVALID) {
1826dcc0 671 high = iwl_rates[high].next_rs;
b481de9c
ZY		 672 if (high == IWL_RATE_INVALID)
673 break;
674 if (rate_mask & (1 << high))
675 break;
e1623446 676 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
b481de9c
ZY		 677 }
678
679 return (high << 8) | low;
680}
681
e227ceac
TW		 682static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
683 struct iwl_scale_tbl_info *tbl,
684 u8 scale_index, u8 ht_possible)
b481de9c 685{
b481de9c
ZY		 686 s32 low;
687 u16 rate_mask;
688 u16 high_low;
689 u8 switch_to_legacy = 0;
c33104f0 690 u8 is_green = lq_sta->is_green;
2ff6578b 691 struct iwl_priv *priv = lq_sta->drv;
b481de9c
ZY		 692
693 /* check if we need to switch from HT to legacy rates.
694 * assumption is that mandatory rates (1Mbps or 6Mbps)
695 * are always supported (spec demand) */
696 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
697 switch_to_legacy = 1;
698 scale_index = rs_ht_to_legacy[scale_index];
8318d78a 699 if (lq_sta->band == IEEE80211_BAND_5GHZ)
b481de9c
ZY		 700 tbl->lq_type = LQ_A;
701 else
702 tbl->lq_type = LQ_G;
703
69fdb309 704 if (num_of_ant(tbl->ant_type) > 1)
2ff6578b
WYG		 705 tbl->ant_type =
706 first_antenna(priv->hw_params.valid_tx_ant);
b481de9c 707
7aafef1c 708 tbl->is_ht40 = 0;
b481de9c 709 tbl->is_SGI = 0;
d6e93399 710 tbl->max_search = IWL_MAX_SEARCH;
b481de9c
ZY		 711 }
712
eecd6e57 713 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
b481de9c 714
77626355 715 /* Mask with station rate restriction */
b481de9c 716 if (is_legacy(tbl->lq_type)) {
77626355 717 /* supp_rates has no CCK bits in A mode */
8318d78a 718 if (lq_sta->band == IEEE80211_BAND_5GHZ)
b481de9c 719 rate_mask = (u16)(rate_mask &
c33104f0 720 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
b481de9c 721 else
c33104f0 722 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
b481de9c
ZY		 723 }
724
77626355 725 /* If we switched from HT to legacy, check current rate */
dc2453ae 726 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
39e88504
GC		 727 low = scale_index;
728 goto out;
b481de9c
ZY		 729 }
730
bf403db8
EK		 731 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
732 tbl->lq_type);
b481de9c
ZY		 733 low = high_low & 0xff;
734
39e88504
GC		 735 if (low == IWL_RATE_INVALID)
736 low = scale_index;
737
738out:
978785a3 739 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
b481de9c
ZY		 740}
741
95407aa4
DH		 742/*
743 * Simple function to compare two rate scale table types
744 */
745static bool table_type_matches(struct iwl_scale_tbl_info *a,
746 struct iwl_scale_tbl_info *b)
747{
748 return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
749 (a->is_SGI == b->is_SGI);
750}
95407aa4 751
77626355
BC		 752/*
753 * mac80211 sends us Tx status
754 */
4b7679a5
JB		 755static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
756 struct ieee80211_sta *sta, void *priv_sta,
e039fa4a 757 struct sk_buff *skb)
b481de9c 758{
95407aa4
DH		 759 int legacy_success;
760 int retries;
761 int rs_index, mac_index, i;
417f114b 762 struct iwl_lq_sta *lq_sta = priv_sta;
66c73db7 763 struct iwl_link_quality_cmd *table;
b481de9c 764 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
4b7679a5 765 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
e039fa4a 766 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
5027309b 767 enum mac80211_rate_control_flags mac_flags;
39e88504 768 u32 tx_rate;
e227ceac 769 struct iwl_scale_tbl_info tbl_type;
04f2dec1 770 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
b481de9c 771
e1623446 772 IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
b481de9c 773
fe6b23dd
RC		 774 /* Treat uninitialized rate scaling data same as non-existing. */
775 if (!lq_sta) {
776 IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n");
777 return;
778 } else if (!lq_sta->drv) {
779 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
780 return;
781 }
782
417f114b 783 if (!ieee80211_is_data(hdr->frame_control) ||
514d65c1 784 info->flags & IEEE80211_TX_CTL_NO_ACK)
b481de9c
ZY		 785 return;
786
e3949d62 787 /* This packet was aggregated but doesn't carry status info */
e039fa4a
JB		 788 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
789 !(info->flags & IEEE80211_TX_STAT_AMPDU))
99556438
RR		 790 return;
791
77626355
BC		 792 /*
793 * Ignore this Tx frame response if its initial rate doesn't match
794 * that of latest Link Quality command. There may be stragglers
795 * from a previous Link Quality command, but we're no longer interested
796 * in those; they're either from the "active" mode while we're trying
797 * to check "search" mode, or a prior "search" mode after we've moved
798 * to a new "search" mode (which might become the new "active" mode).
799 */
95407aa4 800 table = &lq_sta->lq;
39e88504
GC		 801 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
802 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
4c424e4c
RR		 803 if (priv->band == IEEE80211_BAND_5GHZ)
804 rs_index -= IWL_FIRST_OFDM_RATE;
5027309b
DH		 805 mac_flags = info->status.rates[0].flags;
806 mac_index = info->status.rates[0].idx;
31513be8
DH		 807 /* For HT packets, map MCS to PLCP */
808 if (mac_flags & IEEE80211_TX_RC_MCS) {
809 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
810 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
811 mac_index++;
392a0baf
DH		 812 /*
813 * mac80211 HT index is always zero-indexed; we need to move
814 * HT OFDM rates after CCK rates in 2.4 GHz band
815 */
816 if (priv->band == IEEE80211_BAND_2GHZ)
817 mac_index += IWL_FIRST_OFDM_RATE;
31513be8 818 }
95407aa4 819 /* Here we actually compare this rate to the latest LQ command */
5027309b
DH		 820 if ((mac_index < 0) ||
821 (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
822 (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
823 (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
e6a9854b 824 (tbl_type.ant_type != info->antenna_sel_tx) ||
5027309b
DH		 825 (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
826 (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
31513be8
DH		 827 (rs_index != mac_index)) {
828 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate);
95407aa4
DH		 829 /*
830 * Since rates mis-match, the last LQ command may have failed.
831 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
832 * ... driver.
d5e49036 833 */
7d049e5a
AM		 834 lq_sta->missed_rate_counter++;
835 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
836 lq_sta->missed_rate_counter = 0;
fe6b23dd 837 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC, false);
7d049e5a 838 }
95407aa4
DH		 839 /* Regardless, ignore this status info for outdated rate */
840 return;
841 } else
842 /* Rate did match, so reset the missed_rate_counter */
843 lq_sta->missed_rate_counter = 0;
844
845 /* Figure out if rate scale algorithm is in active or search table */
846 if (table_type_matches(&tbl_type,
847 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
848 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
849 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
850 } else if (table_type_matches(&tbl_type,
851 &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
852 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
853 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
854 } else {
855 IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n");
856 return;
b481de9c
ZY		 857 }
858
95407aa4
DH		 859 /*
860 * Updating the frame history depends on whether packets were
861 * aggregated.
862 *
863 * For aggregation, all packets were transmitted at the same rate, the
864 * first index into rate scale table.
865 */
866 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
867 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
868 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
869 &rs_index);
04f2dec1 870 rs_collect_tx_data(curr_tbl, rs_index,
e3a3cd87
DH		 871 info->status.ampdu_len,
872 info->status.ampdu_ack_len);
95407aa4
DH		 873
874 /* Update success/fail counts if not searching for new mode */
875 if (lq_sta->stay_in_tbl) {
e3a3cd87
DH		 876 lq_sta->total_success += info->status.ampdu_ack_len;
877 lq_sta->total_failed += (info->status.ampdu_len -
878 info->status.ampdu_ack_len);
b481de9c 879 }
95407aa4 880 } else {
77626355 881 /*
95407aa4 882 * For legacy, update frame history with for each Tx retry.
77626355 883 */
95407aa4
DH		 884 retries = info->status.rates[0].count - 1;
885 /* HW doesn't send more than 15 retries */
886 retries = min(retries, 15);
887
888 /* The last transmission may have been successful */
889 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
890 /* Collect data for each rate used during failed TX attempts */
891 for (i = 0; i <= retries; ++i) {
892 tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
893 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
894 &tbl_type, &rs_index);
895 /*
896 * Only collect stats if retried rate is in the same RS
897 * table as active/search.
898 */
899 if (table_type_matches(&tbl_type, curr_tbl))
04f2dec1 900 tmp_tbl = curr_tbl;
95407aa4 901 else if (table_type_matches(&tbl_type, other_tbl))
04f2dec1 902 tmp_tbl = other_tbl;
95407aa4
DH		 903 else
904 continue;
04f2dec1
SZ		 905 rs_collect_tx_data(tmp_tbl, rs_index, 1,
906 i < retries ? 0 : legacy_success);
95407aa4
DH		 907 }
908
909 /* Update success/fail counts if not searching for new mode */
910 if (lq_sta->stay_in_tbl) {
911 lq_sta->total_success += legacy_success;
912 lq_sta->total_failed += retries + (1 - legacy_success);
99556438 913 }
b481de9c 914 }
95407aa4
DH		 915 /* The last TX rate is cached in lq_sta; it's set in if/else above */
916 lq_sta->last_rate_n_flags = tx_rate;
b481de9c 917
77626355 918 /* See if there's a better rate or modulation mode to try. */
c338ba3c 919 if (sta && sta->supp_rates[sband->band])
514d65c1 920 rs_rate_scale_perform(priv, skb, sta, lq_sta);
b481de9c
ZY		 921}
922
77626355
BC		 923/*
924 * Begin a period of staying with a selected modulation mode.
925 * Set "stay_in_tbl" flag to prevent any mode switches.
926 * Set frame tx success limits according to legacy vs. high-throughput,
927 * and reset overall (spanning all rates) tx success history statistics.
928 * These control how long we stay using same modulation mode before
929 * searching for a new mode.
930 */
bf403db8 931static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
e227ceac 932 struct iwl_lq_sta *lq_sta)
b481de9c 933{
e1623446 934 IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
c33104f0 935 lq_sta->stay_in_tbl = 1; /* only place this gets set */
b481de9c 936 if (is_legacy) {
c33104f0
TW		 937 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
938 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
939 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
b481de9c 940 } else {
c33104f0
TW		 941 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
942 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
943 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
b481de9c 944 }
c33104f0
TW		 945 lq_sta->table_count = 0;
946 lq_sta->total_failed = 0;
947 lq_sta->total_success = 0;
447fee70 948 lq_sta->flush_timer = jiffies;
d6e93399 949 lq_sta->action_counter = 0;
b481de9c
ZY		 950}
951
77626355
BC		 952/*
953 * Find correct throughput table for given mode of modulation
954 */
e227ceac
TW		 955static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
956 struct iwl_scale_tbl_info *tbl)
b481de9c 957{
e3949d62
DH		 958 /* Used to choose among HT tables */
959 s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
960
961 /* Check for invalid LQ type */
962 if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
963 tbl->expected_tpt = expected_tpt_legacy;
964 return;
965 }
966
967 /* Legacy rates have only one table */
b481de9c 968 if (is_legacy(tbl->lq_type)) {
e3949d62
DH		 969 tbl->expected_tpt = expected_tpt_legacy;
970 return;
971 }
972
973 /* Choose among many HT tables depending on number of streams
974 * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
975 * status */
976 if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
977 ht_tbl_pointer = expected_tpt_siso20MHz;
978 else if (is_siso(tbl->lq_type))
979 ht_tbl_pointer = expected_tpt_siso40MHz;
980 else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
981 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
982 else if (is_mimo2(tbl->lq_type))
983 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
984 else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
985 ht_tbl_pointer = expected_tpt_mimo3_20MHz;
986 else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
987 ht_tbl_pointer = expected_tpt_mimo3_40MHz;
988
989 if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */
990 tbl->expected_tpt = ht_tbl_pointer[0];
991 else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */
992 tbl->expected_tpt = ht_tbl_pointer[1];
993 else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */
994 tbl->expected_tpt = ht_tbl_pointer[2];
995 else /* AGG+SGI */
996 tbl->expected_tpt = ht_tbl_pointer[3];
b481de9c
ZY		 997}
998
77626355
BC		 999/*
1000 * Find starting rate for new "search" high-throughput mode of modulation.
1001 * Goal is to find lowest expected rate (under perfect conditions) that is
1002 * above the current measured throughput of "active" mode, to give new mode
1003 * a fair chance to prove itself without too many challenges.
1004 *
1005 * This gets called when transitioning to more aggressive modulation
1006 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1007 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1008 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1009 * bit rate will typically need to increase, but not if performance was bad.
1010 */
c79dd5b5 1011static s32 rs_get_best_rate(struct iwl_priv *priv,
e227ceac
TW		 1012 struct iwl_lq_sta *lq_sta,
1013 struct iwl_scale_tbl_info *tbl, /* "search" */
f935a6da 1014 u16 rate_mask, s8 index)
b481de9c 1015{
77626355 1016 /* "active" values */
e227ceac 1017 struct iwl_scale_tbl_info *active_tbl =
c33104f0 1018 &(lq_sta->lq_info[lq_sta->active_tbl]);
b481de9c 1019 s32 active_sr = active_tbl->win[index].success_ratio;
b481de9c 1020 s32 active_tpt = active_tbl->expected_tpt[index];
77626355
BC		 1021
1022 /* expected "search" throughput */
1023 s32 *tpt_tbl = tbl->expected_tpt;
1024
1025 s32 new_rate, high, low, start_hi;
b481de9c 1026 u16 high_low;
f935a6da 1027 s8 rate = index;
b481de9c
ZY		 1028
1029 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1030
1031 for (; ;) {
bf403db8
EK		 1032 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1033 tbl->lq_type);
b481de9c
ZY		 1034
1035 low = high_low & 0xff;
1036 high = (high_low >> 8) & 0xff;
1037
77626355
BC		 1038 /*
1039 * Lower the "search" bit rate, to give new "search" mode
1040 * approximately the same throughput as "active" if:
1041 *
1042 * 1) "Active" mode has been working modestly well (but not
1043 * great), and expected "search" throughput (under perfect
1044 * conditions) at candidate rate is above the actual
1045 * measured "active" throughput (but less than expected
1046 * "active" throughput under perfect conditions).
1047 * OR
1048 * 2) "Active" mode has been working perfectly or very well
1049 * and expected "search" throughput (under perfect
1050 * conditions) at candidate rate is above expected
1051 * "active" throughput (under perfect conditions).
1052 */
c33104f0 1053 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
b481de9c
ZY		 1054 ((active_sr > IWL_RATE_DECREASE_TH) &&
1055 (active_sr <= IWL_RATE_HIGH_TH) &&
1056 (tpt_tbl[rate] <= active_tpt))) ||
1057 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1058 (tpt_tbl[rate] > active_tpt))) {
1059
77626355
BC		 1060 /* (2nd or later pass)
1061 * If we've already tried to raise the rate, and are
1062 * now trying to lower it, use the higher rate. */
b481de9c
ZY		 1063 if (start_hi != IWL_RATE_INVALID) {
1064 new_rate = start_hi;
1065 break;
1066 }
77626355 1067
b481de9c 1068 new_rate = rate;
77626355
BC		 1069
1070 /* Loop again with lower rate */
b481de9c
ZY		 1071 if (low != IWL_RATE_INVALID)
1072 rate = low;
77626355
BC		 1073
1074 /* Lower rate not available, use the original */
b481de9c
ZY		 1075 else
1076 break;
77626355
BC		 1077
1078 /* Else try to raise the "search" rate to match "active" */
b481de9c 1079 } else {
77626355
BC		 1080 /* (2nd or later pass)
1081 * If we've already tried to lower the rate, and are
1082 * now trying to raise it, use the lower rate. */
b481de9c
ZY		 1083 if (new_rate != IWL_RATE_INVALID)
1084 break;
77626355
BC		 1085
1086 /* Loop again with higher rate */
b481de9c
ZY		 1087 else if (high != IWL_RATE_INVALID) {
1088 start_hi = high;
1089 rate = high;
77626355
BC		 1090
1091 /* Higher rate not available, use the original */
b481de9c 1092 } else {
90d7795e 1093 new_rate = rate;
b481de9c
ZY		 1094 break;
1095 }
1096 }
1097 }
1098
1099 return new_rate;
1100}
b481de9c 1101
77626355 1102/*
584a0f00 1103 * Set up search table for MIMO2
77626355 1104 */
fde0db31 1105static int rs_switch_to_mimo2(struct iwl_priv *priv,
e227ceac 1106 struct iwl_lq_sta *lq_sta,
270243a5 1107 struct ieee80211_conf *conf,
4b7679a5 1108 struct ieee80211_sta *sta,
e227ceac 1109 struct iwl_scale_tbl_info *tbl, int index)
b481de9c 1110{
b481de9c
ZY		 1111 u16 rate_mask;
1112 s32 rate;
c33104f0 1113 s8 is_green = lq_sta->is_green;
b481de9c 1114
de27e64e 1115 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
b481de9c
ZY		 1116 return -1;
1117
d9fe60de 1118 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
00c5ae2f 1119 == WLAN_HT_CAP_SM_PS_STATIC)
b481de9c
ZY		 1120 return -1;
1121
77626355 1122 /* Need both Tx chains/antennas to support MIMO */
aade00ce 1123 if (priv->hw_params.tx_chains_num < 2)
b481de9c
ZY		 1124 return -1;
1125
e1623446 1126 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
39e88504
GC		 1127
1128 tbl->lq_type = LQ_MIMO2;
c33104f0 1129 tbl->is_dup = lq_sta->is_dup;
b481de9c 1130 tbl->action = 0;
d6e93399 1131 tbl->max_search = IWL_MAX_SEARCH;
39e88504
GC		 1132 rate_mask = lq_sta->active_mimo2_rate;
1133
7aafef1c
WYG		 1134 if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1135 tbl->is_ht40 = 1;
b481de9c 1136 else
7aafef1c 1137 tbl->is_ht40 = 0;
b481de9c 1138
eecd6e57 1139 rs_set_expected_tpt_table(lq_sta, tbl);
b481de9c 1140
f935a6da 1141 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
b481de9c 1142
e1623446 1143 IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
584a0f00
WYG		 1144 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1145 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1146 rate, rate_mask);
1147 return -1;
1148 }
1149 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1150
1151 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1152 tbl->current_rate, is_green);
1153 return 0;
1154}
1155
1156/*
1157 * Set up search table for MIMO3
1158 */
1159static int rs_switch_to_mimo3(struct iwl_priv *priv,
1160 struct iwl_lq_sta *lq_sta,
1161 struct ieee80211_conf *conf,
1162 struct ieee80211_sta *sta,
1163 struct iwl_scale_tbl_info *tbl, int index)
1164{
1165 u16 rate_mask;
1166 s32 rate;
1167 s8 is_green = lq_sta->is_green;
1168
1169 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1170 return -1;
1171
1172 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1173 == WLAN_HT_CAP_SM_PS_STATIC)
1174 return -1;
1175
1176 /* Need both Tx chains/antennas to support MIMO */
1177 if (priv->hw_params.tx_chains_num < 3)
1178 return -1;
1179
1180 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1181
1182 tbl->lq_type = LQ_MIMO3;
1183 tbl->is_dup = lq_sta->is_dup;
1184 tbl->action = 0;
d6e93399 1185 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
584a0f00
WYG		 1186 rate_mask = lq_sta->active_mimo3_rate;
1187
7aafef1c
WYG		 1188 if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1189 tbl->is_ht40 = 1;
584a0f00 1190 else
7aafef1c 1191 tbl->is_ht40 = 0;
39e88504 1192
584a0f00
WYG		 1193 rs_set_expected_tpt_table(lq_sta, tbl);
1194
1195 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1196
1197 IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1198 rate, rate_mask);
39e88504 1199 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
e1623446 1200 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
39e88504 1201 rate, rate_mask);
b481de9c 1202 return -1;
39e88504 1203 }
978785a3 1204 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
b481de9c 1205
e1623446 1206 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
39e88504 1207 tbl->current_rate, is_green);
dc2453ae 1208 return 0;
fde0db31 1209}
b481de9c 1210
77626355
BC		 1211/*
1212 * Set up search table for SISO
1213 */
c79dd5b5 1214static int rs_switch_to_siso(struct iwl_priv *priv,
e227ceac 1215 struct iwl_lq_sta *lq_sta,
270243a5 1216 struct ieee80211_conf *conf,
4b7679a5 1217 struct ieee80211_sta *sta,
e227ceac 1218 struct iwl_scale_tbl_info *tbl, int index)
b481de9c 1219{
b481de9c 1220 u16 rate_mask;
c33104f0 1221 u8 is_green = lq_sta->is_green;
b481de9c
ZY		 1222 s32 rate;
1223
de27e64e 1224 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
b481de9c
ZY		 1225 return -1;
1226
e1623446 1227 IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
39e88504 1228
c33104f0 1229 tbl->is_dup = lq_sta->is_dup;
b481de9c
ZY		 1230 tbl->lq_type = LQ_SISO;
1231 tbl->action = 0;
d6e93399 1232 tbl->max_search = IWL_MAX_SEARCH;
39e88504 1233 rate_mask = lq_sta->active_siso_rate;
b481de9c 1234
7aafef1c
WYG		 1235 if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1236 tbl->is_ht40 = 1;
b481de9c 1237 else
7aafef1c 1238 tbl->is_ht40 = 0;
b481de9c 1239
b481de9c 1240 if (is_green)
39e88504 1241 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
b481de9c 1242
eecd6e57 1243 rs_set_expected_tpt_table(lq_sta, tbl);
f935a6da 1244 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
b481de9c 1245
e1623446 1246 IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
b481de9c 1247 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
e1623446 1248 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
b481de9c
ZY		 1249 rate, rate_mask);
1250 return -1;
1251 }
978785a3 1252 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
e1623446 1253 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
39e88504 1254 tbl->current_rate, is_green);
403ab56b 1255 return 0;
b481de9c
ZY		 1256}
1257
77626355
BC		 1258/*
1259 * Try to switch to new modulation mode from legacy
1260 */
c79dd5b5 1261static int rs_move_legacy_other(struct iwl_priv *priv,
e227ceac 1262 struct iwl_lq_sta *lq_sta,
270243a5 1263 struct ieee80211_conf *conf,
4b7679a5 1264 struct ieee80211_sta *sta,
b481de9c
ZY		 1265 int index)
1266{
e227ceac
TW		 1267 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1268 struct iwl_scale_tbl_info *search_tbl =
1269 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1270 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1271 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1272 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
b481de9c 1273 u8 start_action = tbl->action;
fde0db31 1274 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
3110bef7 1275 u8 tx_chains_num = priv->hw_params.tx_chains_num;
fde0db31 1276 int ret = 0;
d6e93399 1277 u8 update_search_tbl_counter = 0;
b481de9c 1278
46f9381a
WYG		 1279 if (!iwl_ht_enabled(priv))
1280 /* stay in Legacy */
1281 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
3ad3b92a 1282 else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
46f9381a
WYG		 1283 tbl->action > IWL_LEGACY_SWITCH_SISO)
1284 tbl->action = IWL_LEGACY_SWITCH_SISO;
b481de9c 1285 for (; ;) {
d6e93399 1286 lq_sta->action_counter++;
b481de9c 1287 switch (tbl->action) {
3110bef7
GC		 1288 case IWL_LEGACY_SWITCH_ANTENNA1:
1289 case IWL_LEGACY_SWITCH_ANTENNA2:
e1623446 1290 IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
b481de9c 1291
3110bef7
GC		 1292 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1293 tx_chains_num <= 1) ||
1294 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1295 tx_chains_num <= 2))
1296 break;
1297
77626355 1298 /* Don't change antenna if success has been great */
b481de9c
ZY		 1299 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1300 break;
77626355 1301
77626355 1302 /* Set up search table to try other antenna */
b481de9c
ZY		 1303 memcpy(search_tbl, tbl, sz);
1304
aade00ce
GC		 1305 if (rs_toggle_antenna(valid_tx_ant,
1306 &search_tbl->current_rate, search_tbl)) {
d6e93399 1307 update_search_tbl_counter = 1;
3110bef7 1308 rs_set_expected_tpt_table(lq_sta, search_tbl);
aade00ce
GC		 1309 goto out;
1310 }
a5e8b505 1311 break;
b481de9c 1312 case IWL_LEGACY_SWITCH_SISO:
e1623446 1313 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
77626355
BC		 1314
1315 /* Set up search table to try SISO */
b481de9c 1316 memcpy(search_tbl, tbl, sz);
b481de9c 1317 search_tbl->is_SGI = 0;
c33104f0 1318 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
270243a5 1319 search_tbl, index);
dc2453ae 1320 if (!ret) {
c33104f0 1321 lq_sta->action_counter = 0;
b481de9c 1322 goto out;
dc2453ae 1323 }
b481de9c
ZY		 1324
1325 break;
3110bef7
GC		 1326 case IWL_LEGACY_SWITCH_MIMO2_AB:
1327 case IWL_LEGACY_SWITCH_MIMO2_AC:
1328 case IWL_LEGACY_SWITCH_MIMO2_BC:
e1623446 1329 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
77626355
BC		 1330
1331 /* Set up search table to try MIMO */
b481de9c 1332 memcpy(search_tbl, tbl, sz);
b481de9c 1333 search_tbl->is_SGI = 0;
3110bef7
GC		 1334
1335 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1336 search_tbl->ant_type = ANT_AB;
1337 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1338 search_tbl->ant_type = ANT_AC;
1339 else
1340 search_tbl->ant_type = ANT_BC;
1341
1342 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1343 break;
1344
fde0db31 1345 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
270243a5 1346 search_tbl, index);
dc2453ae 1347 if (!ret) {
c33104f0 1348 lq_sta->action_counter = 0;
b481de9c 1349 goto out;
dc2453ae 1350 }
b481de9c 1351 break;
584a0f00
WYG		 1352
1353 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1354 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1355
1356 /* Set up search table to try MIMO3 */
1357 memcpy(search_tbl, tbl, sz);
1358 search_tbl->is_SGI = 0;
1359
1360 search_tbl->ant_type = ANT_ABC;
1361
1362 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1363 break;
1364
1365 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1366 search_tbl, index);
1367 if (!ret) {
1368 lq_sta->action_counter = 0;
1369 goto out;
1370 }
1371 break;
b481de9c
ZY		 1372 }
1373 tbl->action++;
584a0f00 1374 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
3110bef7 1375 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
b481de9c
ZY		 1376
1377 if (tbl->action == start_action)
1378 break;
1379
1380 }
3110bef7 1381 search_tbl->lq_type = LQ_NONE;
b481de9c
ZY		 1382 return 0;
1383
3110bef7
GC		 1384out:
1385 lq_sta->search_better_tbl = 1;
b481de9c 1386 tbl->action++;
584a0f00 1387 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
3110bef7 1388 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
d6e93399
MA		 1389 if (update_search_tbl_counter)
1390 search_tbl->action = tbl->action;
b481de9c
ZY		 1391 return 0;
1392
1393}
1394
77626355
BC		 1395/*
1396 * Try to switch to new modulation mode from SISO
1397 */
c79dd5b5 1398static int rs_move_siso_to_other(struct iwl_priv *priv,
e227ceac 1399 struct iwl_lq_sta *lq_sta,
270243a5 1400 struct ieee80211_conf *conf,
4b7679a5 1401 struct ieee80211_sta *sta, int index)
b481de9c 1402{
c33104f0 1403 u8 is_green = lq_sta->is_green;
e227ceac
TW		 1404 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1405 struct iwl_scale_tbl_info *search_tbl =
1406 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1407 struct iwl_rate_scale_data *window = &(tbl->win[index]);
28e6f489 1408 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
e227ceac
TW		 1409 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1410 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
b481de9c 1411 u8 start_action = tbl->action;
fde0db31 1412 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
3110bef7 1413 u8 tx_chains_num = priv->hw_params.tx_chains_num;
d6e93399 1414 u8 update_search_tbl_counter = 0;
fde0db31 1415 int ret;
b481de9c 1416
3ad3b92a 1417 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
46f9381a
WYG		 1418 tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1419 /* stay in SISO */
1420 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1421 }
b481de9c 1422 for (;;) {
c33104f0 1423 lq_sta->action_counter++;
b481de9c 1424 switch (tbl->action) {
3110bef7
GC		 1425 case IWL_SISO_SWITCH_ANTENNA1:
1426 case IWL_SISO_SWITCH_ANTENNA2:
e1623446 1427 IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
3110bef7
GC		 1428
1429 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1430 tx_chains_num <= 1) ||
1431 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1432 tx_chains_num <= 2))
1433 break;
1434
b481de9c
ZY		 1435 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1436 break;
b481de9c
ZY		 1437
1438 memcpy(search_tbl, tbl, sz);
aade00ce 1439 if (rs_toggle_antenna(valid_tx_ant,
d6e93399
MA		 1440 &search_tbl->current_rate, search_tbl)) {
1441 update_search_tbl_counter = 1;
aade00ce 1442 goto out;
d6e93399 1443 }
a5e8b505 1444 break;
3110bef7
GC		 1445 case IWL_SISO_SWITCH_MIMO2_AB:
1446 case IWL_SISO_SWITCH_MIMO2_AC:
1447 case IWL_SISO_SWITCH_MIMO2_BC:
e1623446 1448 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
b481de9c 1449 memcpy(search_tbl, tbl, sz);
b481de9c 1450 search_tbl->is_SGI = 0;
3110bef7
GC		 1451
1452 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1453 search_tbl->ant_type = ANT_AB;
1454 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1455 search_tbl->ant_type = ANT_AC;
1456 else
1457 search_tbl->ant_type = ANT_BC;
1458
1459 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1460 break;
1461
fde0db31 1462 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
270243a5 1463 search_tbl, index);
3110bef7 1464 if (!ret)
b481de9c
ZY		 1465 goto out;
1466 break;
1467 case IWL_SISO_SWITCH_GI:
28e6f489
DH		 1468 if (!tbl->is_ht40 && !(ht_cap->cap &
1469 IEEE80211_HT_CAP_SGI_20))
a9841013 1470 break;
28e6f489
DH		 1471 if (tbl->is_ht40 && !(ht_cap->cap &
1472 IEEE80211_HT_CAP_SGI_40))
a9841013
EG		 1473 break;
1474
e1623446 1475 IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
0c11b4de 1476
b481de9c 1477 memcpy(search_tbl, tbl, sz);
39e88504
GC		 1478 if (is_green) {
1479 if (!tbl->is_SGI)
1480 break;
1481 else
15b1687c
WT		 1482 IWL_ERR(priv,
1483 "SGI was set in GF+SISO\n");
b481de9c 1484 }
39e88504 1485 search_tbl->is_SGI = !tbl->is_SGI;
eecd6e57 1486 rs_set_expected_tpt_table(lq_sta, search_tbl);
39e88504
GC		 1487 if (tbl->is_SGI) {
1488 s32 tpt = lq_sta->last_tpt / 100;
1489 if (tpt >= search_tbl->expected_tpt[index])
1490 break;
1491 }
978785a3
TW		 1492 search_tbl->current_rate =
1493 rate_n_flags_from_tbl(priv, search_tbl,
1494 index, is_green);
d6e93399 1495 update_search_tbl_counter = 1;
b481de9c 1496 goto out;
584a0f00
WYG		 1497 case IWL_SISO_SWITCH_MIMO3_ABC:
1498 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1499 memcpy(search_tbl, tbl, sz);
1500 search_tbl->is_SGI = 0;
1501 search_tbl->ant_type = ANT_ABC;
1502
1503 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1504 break;
1505
1506 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1507 search_tbl, index);
1508 if (!ret)
1509 goto out;
1510 break;
b481de9c
ZY		 1511 }
1512 tbl->action++;
584a0f00 1513 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
3110bef7 1514 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
b481de9c
ZY		 1515
1516 if (tbl->action == start_action)
1517 break;
1518 }
3110bef7 1519 search_tbl->lq_type = LQ_NONE;
b481de9c
ZY		 1520 return 0;
1521
1522 out:
3110bef7 1523 lq_sta->search_better_tbl = 1;
b481de9c 1524 tbl->action++;
584a0f00 1525 if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
3110bef7 1526 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
d6e93399
MA		 1527 if (update_search_tbl_counter)
1528 search_tbl->action = tbl->action;
1529
b481de9c
ZY		 1530 return 0;
1531}
1532
77626355 1533/*
584a0f00 1534 * Try to switch to new modulation mode from MIMO2
77626355 1535 */
584a0f00 1536static int rs_move_mimo2_to_other(struct iwl_priv *priv,
e227ceac 1537 struct iwl_lq_sta *lq_sta,
270243a5 1538 struct ieee80211_conf *conf,
4b7679a5 1539 struct ieee80211_sta *sta, int index)
b481de9c 1540{
c33104f0 1541 s8 is_green = lq_sta->is_green;
e227ceac
TW		 1542 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1543 struct iwl_scale_tbl_info *search_tbl =
1544 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
3110bef7 1545 struct iwl_rate_scale_data *window = &(tbl->win[index]);
28e6f489 1546 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
e227ceac
TW		 1547 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1548 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
b481de9c 1549 u8 start_action = tbl->action;
3110bef7
GC		 1550 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1551 u8 tx_chains_num = priv->hw_params.tx_chains_num;
d6e93399 1552 u8 update_search_tbl_counter = 0;
aade00ce 1553 int ret;
b481de9c 1554
3ad3b92a 1555 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
46f9381a
WYG		 1556 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1557 tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1558 /* switch in SISO */
1559 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1560 }
b481de9c 1561 for (;;) {
c33104f0 1562 lq_sta->action_counter++;
b481de9c 1563 switch (tbl->action) {
3110bef7
GC		 1564 case IWL_MIMO2_SWITCH_ANTENNA1:
1565 case IWL_MIMO2_SWITCH_ANTENNA2:
584a0f00 1566 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
3110bef7
GC		 1567
1568 if (tx_chains_num <= 2)
1569 break;
1570
1571 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1572 break;
1573
1574 memcpy(search_tbl, tbl, sz);
1575 if (rs_toggle_antenna(valid_tx_ant,
d6e93399
MA		 1576 &search_tbl->current_rate, search_tbl)) {
1577 update_search_tbl_counter = 1;
3110bef7 1578 goto out;
d6e93399 1579 }
3110bef7
GC		 1580 break;
1581 case IWL_MIMO2_SWITCH_SISO_A:
1582 case IWL_MIMO2_SWITCH_SISO_B:
1583 case IWL_MIMO2_SWITCH_SISO_C:
e1623446 1584 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
0c11b4de 1585
77626355 1586 /* Set up new search table for SISO */
b481de9c 1587 memcpy(search_tbl, tbl, sz);
39e88504 1588
3110bef7 1589 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
fde0db31 1590 search_tbl->ant_type = ANT_A;
3110bef7 1591 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
fde0db31 1592 search_tbl->ant_type = ANT_B;
3110bef7
GC		 1593 else
1594 search_tbl->ant_type = ANT_C;
1595
1596 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1597 break;
b481de9c 1598
c33104f0 1599 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
270243a5 1600 search_tbl, index);
3110bef7 1601 if (!ret)
b481de9c 1602 goto out;
3110bef7 1603
b481de9c
ZY		 1604 break;
1605
3110bef7 1606 case IWL_MIMO2_SWITCH_GI:
28e6f489
DH		 1607 if (!tbl->is_ht40 && !(ht_cap->cap &
1608 IEEE80211_HT_CAP_SGI_20))
a9841013 1609 break;
28e6f489
DH		 1610 if (tbl->is_ht40 && !(ht_cap->cap &
1611 IEEE80211_HT_CAP_SGI_40))
a9841013
EG		 1612 break;
1613
584a0f00 1614 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
77626355 1615
584a0f00 1616 /* Set up new search table for MIMO2 */
b481de9c 1617 memcpy(search_tbl, tbl, sz);
39e88504 1618 search_tbl->is_SGI = !tbl->is_SGI;
eecd6e57 1619 rs_set_expected_tpt_table(lq_sta, search_tbl);
77626355
BC		 1620 /*
1621 * If active table already uses the fastest possible
1622 * modulation (dual stream with short guard interval),
1623 * and it's working well, there's no need to look
1624 * for a better type of modulation!
1625 */
39e88504 1626 if (tbl->is_SGI) {
c33104f0 1627 s32 tpt = lq_sta->last_tpt / 100;
39e88504
GC		 1628 if (tpt >= search_tbl->expected_tpt[index])
1629 break;
b481de9c 1630 }
978785a3
TW		 1631 search_tbl->current_rate =
1632 rate_n_flags_from_tbl(priv, search_tbl,
1633 index, is_green);
d6e93399 1634 update_search_tbl_counter = 1;
b481de9c
ZY		 1635 goto out;
1636
584a0f00
WYG		 1637 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1638 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1639 memcpy(search_tbl, tbl, sz);
1640 search_tbl->is_SGI = 0;
1641 search_tbl->ant_type = ANT_ABC;
1642
1643 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1644 break;
1645
1646 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1647 search_tbl, index);
1648 if (!ret)
1649 goto out;
1650
1651 break;
b481de9c
ZY		 1652 }
1653 tbl->action++;
584a0f00 1654 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
3110bef7 1655 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
b481de9c
ZY		 1656
1657 if (tbl->action == start_action)
1658 break;
1659 }
3110bef7 1660 search_tbl->lq_type = LQ_NONE;
b481de9c
ZY		 1661 return 0;
1662 out:
3110bef7 1663 lq_sta->search_better_tbl = 1;
b481de9c 1664 tbl->action++;
584a0f00 1665 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
3110bef7 1666 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
d6e93399
MA		 1667 if (update_search_tbl_counter)
1668 search_tbl->action = tbl->action;
1669
b481de9c
ZY		 1670 return 0;
1671
1672}
1673
584a0f00
WYG		 1674/*
1675 * Try to switch to new modulation mode from MIMO3
1676 */
1677static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1678 struct iwl_lq_sta *lq_sta,
1679 struct ieee80211_conf *conf,
1680 struct ieee80211_sta *sta, int index)
1681{
1682 s8 is_green = lq_sta->is_green;
1683 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1684 struct iwl_scale_tbl_info *search_tbl =
1685 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1686 struct iwl_rate_scale_data *window = &(tbl->win[index]);
28e6f489 1687 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
584a0f00
WYG		 1688 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1689 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1690 u8 start_action = tbl->action;
1691 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1692 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1693 int ret;
d6e93399 1694 u8 update_search_tbl_counter = 0;
584a0f00 1695
3ad3b92a 1696 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
46f9381a
WYG		 1697 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1698 tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1699 /* switch in SISO */
1700 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1701 }
584a0f00
WYG		 1702 for (;;) {
1703 lq_sta->action_counter++;
1704 switch (tbl->action) {
1705 case IWL_MIMO3_SWITCH_ANTENNA1:
1706 case IWL_MIMO3_SWITCH_ANTENNA2:
1707 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
1708
1709 if (tx_chains_num <= 3)
1710 break;
1711
1712 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1713 break;
1714
1715 memcpy(search_tbl, tbl, sz);
1716 if (rs_toggle_antenna(valid_tx_ant,
1717 &search_tbl->current_rate, search_tbl))
1718 goto out;
1719 break;
1720 case IWL_MIMO3_SWITCH_SISO_A:
1721 case IWL_MIMO3_SWITCH_SISO_B:
1722 case IWL_MIMO3_SWITCH_SISO_C:
1723 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
1724
1725 /* Set up new search table for SISO */
1726 memcpy(search_tbl, tbl, sz);
1727
1728 if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
1729 search_tbl->ant_type = ANT_A;
1730 else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
1731 search_tbl->ant_type = ANT_B;
1732 else
1733 search_tbl->ant_type = ANT_C;
1734
1735 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1736 break;
1737
1738 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1739 search_tbl, index);
1740 if (!ret)
1741 goto out;
1742
1743 break;
1744
1745 case IWL_MIMO3_SWITCH_MIMO2_AB:
1746 case IWL_MIMO3_SWITCH_MIMO2_AC:
1747 case IWL_MIMO3_SWITCH_MIMO2_BC:
1748 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
1749
1750 memcpy(search_tbl, tbl, sz);
1751 search_tbl->is_SGI = 0;
1752 if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
1753 search_tbl->ant_type = ANT_AB;
1754 else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
1755 search_tbl->ant_type = ANT_AC;
1756 else
1757 search_tbl->ant_type = ANT_BC;
1758
1759 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1760 break;
1761
1762 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1763 search_tbl, index);
1764 if (!ret)
1765 goto out;
1766
1767 break;
1768
1769 case IWL_MIMO3_SWITCH_GI:
28e6f489
DH		 1770 if (!tbl->is_ht40 && !(ht_cap->cap &
1771 IEEE80211_HT_CAP_SGI_20))
584a0f00 1772 break;
28e6f489
DH		 1773 if (tbl->is_ht40 && !(ht_cap->cap &
1774 IEEE80211_HT_CAP_SGI_40))
584a0f00
WYG		 1775 break;
1776
1777 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
1778
1779 /* Set up new search table for MIMO */
1780 memcpy(search_tbl, tbl, sz);
1781 search_tbl->is_SGI = !tbl->is_SGI;
1782 rs_set_expected_tpt_table(lq_sta, search_tbl);
1783 /*
1784 * If active table already uses the fastest possible
1785 * modulation (dual stream with short guard interval),
1786 * and it's working well, there's no need to look
1787 * for a better type of modulation!
1788 */
1789 if (tbl->is_SGI) {
1790 s32 tpt = lq_sta->last_tpt / 100;
1791 if (tpt >= search_tbl->expected_tpt[index])
1792 break;
1793 }
1794 search_tbl->current_rate =
1795 rate_n_flags_from_tbl(priv, search_tbl,
1796 index, is_green);
d6e93399 1797 update_search_tbl_counter = 1;
584a0f00
WYG		 1798 goto out;
1799 }
1800 tbl->action++;
1801 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1802 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1803
1804 if (tbl->action == start_action)
1805 break;
1806 }
1807 search_tbl->lq_type = LQ_NONE;
1808 return 0;
1809 out:
1810 lq_sta->search_better_tbl = 1;
1811 tbl->action++;
1812 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1813 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
d6e93399
MA		 1814 if (update_search_tbl_counter)
1815 search_tbl->action = tbl->action;
1816
584a0f00
WYG		 1817 return 0;
1818
1819}
1820
77626355
BC		 1821/*
1822 * Check whether we should continue using same modulation mode, or
1823 * begin search for a new mode, based on:
1824 * 1) # tx successes or failures while using this mode
1825 * 2) # times calling this function
1826 * 3) elapsed time in this mode (not used, for now)
1827 */
e227ceac 1828static void rs_stay_in_table(struct iwl_lq_sta *lq_sta)
b481de9c 1829{
e227ceac 1830 struct iwl_scale_tbl_info *tbl;
b481de9c
ZY		 1831 int i;
1832 int active_tbl;
1833 int flush_interval_passed = 0;
bf403db8 1834 struct iwl_priv *priv;
b481de9c 1835
bf403db8 1836 priv = lq_sta->drv;
c33104f0 1837 active_tbl = lq_sta->active_tbl;
b481de9c 1838
c33104f0 1839 tbl = &(lq_sta->lq_info[active_tbl]);
b481de9c 1840
77626355 1841 /* If we've been disallowing search, see if we should now allow it */
c33104f0 1842 if (lq_sta->stay_in_tbl) {
b481de9c 1843
77626355 1844 /* Elapsed time using current modulation mode */
c33104f0 1845 if (lq_sta->flush_timer)
b481de9c 1846 flush_interval_passed =
447fee70
MA		 1847 time_after(jiffies,
1848 (unsigned long)(lq_sta->flush_timer +
b481de9c
ZY		 1849 IWL_RATE_SCALE_FLUSH_INTVL));
1850
77626355
BC		 1851 /*
1852 * Check if we should allow search for new modulation mode.
1853 * If many frames have failed or succeeded, or we've used
1854 * this same modulation for a long time, allow search, and
1855 * reset history stats that keep track of whether we should
1856 * allow a new search. Also (below) reset all bitmaps and
1857 * stats in active history.
1858 */
c33104f0
TW		 1859 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1860 (lq_sta->total_success > lq_sta->max_success_limit) ||
1861 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
b481de9c 1862 && (flush_interval_passed))) {
e1623446 1863 IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n:",
c33104f0
TW		 1864 lq_sta->total_failed,
1865 lq_sta->total_success,
b481de9c 1866 flush_interval_passed);
77626355
BC		 1867
1868 /* Allow search for new mode */
c33104f0
TW		 1869 lq_sta->stay_in_tbl = 0; /* only place reset */
1870 lq_sta->total_failed = 0;
1871 lq_sta->total_success = 0;
1872 lq_sta->flush_timer = 0;
77626355
BC		 1873
1874 /*
1875 * Else if we've used this modulation mode enough repetitions
1876 * (regardless of elapsed time or success/failure), reset
1877 * history bitmaps and rate-specific stats for all rates in
1878 * active table.
1879 */
403ab56b 1880 } else {
c33104f0
TW		 1881 lq_sta->table_count++;
1882 if (lq_sta->table_count >=
1883 lq_sta->table_count_limit) {
1884 lq_sta->table_count = 0;
b481de9c 1885
e1623446 1886 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
b481de9c
ZY		 1887 for (i = 0; i < IWL_RATE_COUNT; i++)
1888 rs_rate_scale_clear_window(
1889 &(tbl->win[i]));
1890 }
1891 }
1892
77626355
BC		 1893 /* If transitioning to allow "search", reset all history
1894 * bitmaps and stats in active table (this will become the new
1895 * "search" table). */
c33104f0 1896 if (!lq_sta->stay_in_tbl) {
b481de9c
ZY		 1897 for (i = 0; i < IWL_RATE_COUNT; i++)
1898 rs_rate_scale_clear_window(&(tbl->win[i]));
1899 }
1900 }
1901}
1902
e3139fe7
WYG		 1903/*
1904 * setup rate table in uCode
1905 * return rate_n_flags as used in the table
1906 */
1907static u32 rs_update_rate_tbl(struct iwl_priv *priv,
1908 struct iwl_lq_sta *lq_sta,
1909 struct iwl_scale_tbl_info *tbl,
1910 int index, u8 is_green)
1911{
1912 u32 rate;
1913
1914 /* Update uCode's rate table. */
1915 rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
1916 rs_fill_link_cmd(priv, lq_sta, rate);
fe6b23dd 1917 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC, false);
e3139fe7
WYG		 1918
1919 return rate;
1920}
1921
77626355
BC		 1922/*
1923 * Do rate scaling and search for new modulation mode.
1924 */
c79dd5b5 1925static void rs_rate_scale_perform(struct iwl_priv *priv,
514d65c1 1926 struct sk_buff *skb,
4b7679a5
JB		 1927 struct ieee80211_sta *sta,
1928 struct iwl_lq_sta *lq_sta)
b481de9c 1929{
4b7679a5 1930 struct ieee80211_hw *hw = priv->hw;
270243a5 1931 struct ieee80211_conf *conf = &hw->conf;
514d65c1
GS		 1932 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1933 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
b481de9c
ZY		 1934 int low = IWL_RATE_INVALID;
1935 int high = IWL_RATE_INVALID;
1936 int index;
1937 int i;
e227ceac 1938 struct iwl_rate_scale_data *window = NULL;
b481de9c
ZY		 1939 int current_tpt = IWL_INVALID_VALUE;
1940 int low_tpt = IWL_INVALID_VALUE;
1941 int high_tpt = IWL_INVALID_VALUE;
1942 u32 fail_count;
1943 s8 scale_action = 0;
fd7c8a40 1944 u16 rate_mask;
b481de9c 1945 u8 update_lq = 0;
e227ceac 1946 struct iwl_scale_tbl_info *tbl, *tbl1;
b481de9c 1947 u16 rate_scale_index_msk = 0;
39e88504 1948 u32 rate;
b481de9c
ZY		 1949 u8 is_green = 0;
1950 u8 active_tbl = 0;
1951 u8 done_search = 0;
1952 u16 high_low;
a5e8b505 1953 s32 sr;
0c11b4de 1954 u8 tid = MAX_TID_COUNT;
86b4766b 1955 struct iwl_tid_data *tid_data;
b481de9c 1956
e1623446 1957 IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
b481de9c 1958
514d65c1 1959 /* Send management frames and NO_ACK data using lowest rate. */
417f114b
TW		 1960 /* TODO: this could probably be improved.. */
1961 if (!ieee80211_is_data(hdr->frame_control) ||
514d65c1 1962 info->flags & IEEE80211_TX_CTL_NO_ACK)
b481de9c 1963 return;
b481de9c 1964
4b7679a5 1965 if (!sta || !lq_sta)
b481de9c
ZY		 1966 return;
1967
4b7679a5 1968 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
b481de9c 1969
faa29718 1970 tid = rs_tl_add_packet(lq_sta, hdr);
e3949d62
DH		 1971 if ((tid != MAX_TID_COUNT) && (lq_sta->tx_agg_tid_en & (1 << tid))) {
1972 tid_data = &priv->stations[lq_sta->lq.sta_id].tid[tid];
1973 if (tid_data->agg.state == IWL_AGG_OFF)
1974 lq_sta->is_agg = 0;
1975 else
1976 lq_sta->is_agg = 1;
1977 } else
1978 lq_sta->is_agg = 0;
faa29718 1979
77626355
BC		 1980 /*
1981 * Select rate-scale / modulation-mode table to work with in
1982 * the rest of this function: "search" if searching for better
1983 * modulation mode, or "active" if doing rate scaling within a mode.
1984 */
c33104f0
TW		 1985 if (!lq_sta->search_better_tbl)
1986 active_tbl = lq_sta->active_tbl;
b481de9c 1987 else
c33104f0 1988 active_tbl = 1 - lq_sta->active_tbl;
b481de9c 1989
c33104f0 1990 tbl = &(lq_sta->lq_info[active_tbl]);
2681b20b
WYG		 1991 if (is_legacy(tbl->lq_type))
1992 lq_sta->is_green = 0;
1993 else
b261793d 1994 lq_sta->is_green = rs_use_green(sta, &priv->current_ht_config);
c33104f0 1995 is_green = lq_sta->is_green;
b481de9c 1996
77626355 1997 /* current tx rate */
b7e35008 1998 index = lq_sta->last_txrate_idx;
b481de9c 1999
e1623446 2000 IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
b481de9c
ZY		 2001 tbl->lq_type);
2002
77626355 2003 /* rates available for this association, and for modulation mode */
eecd6e57 2004 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
b481de9c 2005
91dd6c27 2006 IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
b481de9c
ZY		 2007
2008 /* mask with station rate restriction */
2009 if (is_legacy(tbl->lq_type)) {
8318d78a 2010 if (lq_sta->band == IEEE80211_BAND_5GHZ)
77626355 2011 /* supp_rates has no CCK bits in A mode */
b481de9c 2012 rate_scale_index_msk = (u16) (rate_mask &
c33104f0 2013 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
b481de9c
ZY		 2014 else
2015 rate_scale_index_msk = (u16) (rate_mask &
c33104f0 2016 lq_sta->supp_rates);
b481de9c
ZY		 2017
2018 } else
2019 rate_scale_index_msk = rate_mask;
2020
2021 if (!rate_scale_index_msk)
2022 rate_scale_index_msk = rate_mask;
2023
07bc28ed 2024 if (!((1 << index) & rate_scale_index_msk)) {
15b1687c 2025 IWL_ERR(priv, "Current Rate is not valid\n");
e3139fe7
WYG		 2026 if (lq_sta->search_better_tbl) {
2027 /* revert to active table if search table is not valid*/
2028 tbl->lq_type = LQ_NONE;
2029 lq_sta->search_better_tbl = 0;
2030 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2031 /* get "active" rate info */
2032 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2033 rate = rs_update_rate_tbl(priv, lq_sta,
2034 tbl, index, is_green);
2035 }
07bc28ed 2036 return;
b481de9c
ZY		 2037 }
2038
77626355 2039 /* Get expected throughput table and history window for current rate */
07bc28ed 2040 if (!tbl->expected_tpt) {
15b1687c 2041 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
07bc28ed
GC		 2042 return;
2043 }
b481de9c 2044
c6ec7a9b
AM		 2045 /* force user max rate if set by user */
2046 if ((lq_sta->max_rate_idx != -1) &&
2047 (lq_sta->max_rate_idx < index)) {
2048 index = lq_sta->max_rate_idx;
2049 update_lq = 1;
2050 window = &(tbl->win[index]);
2051 goto lq_update;
2052 }
2053
b481de9c
ZY		 2054 window = &(tbl->win[index]);
2055
77626355
BC		 2056 /*
2057 * If there is not enough history to calculate actual average
2058 * throughput, keep analyzing results of more tx frames, without
2059 * changing rate or mode (bypass most of the rest of this function).
2060 * Set up new rate table in uCode only if old rate is not supported
2061 * in current association (use new rate found above).
2062 */
b481de9c 2063 fail_count = window->counter - window->success_counter;
07bc28ed
GC		 2064 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2065 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
e1623446 2066 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
b481de9c
ZY		 2067 "for index %d\n",
2068 window->success_counter, window->counter, index);
77626355
BC		 2069
2070 /* Can't calculate this yet; not enough history */
b481de9c 2071 window->average_tpt = IWL_INVALID_VALUE;
77626355
BC		 2072
2073 /* Should we stay with this modulation mode,
2074 * or search for a new one? */
c33104f0 2075 rs_stay_in_table(lq_sta);
77626355 2076
b481de9c 2077 goto out;
3110bef7 2078 }
77626355
BC		 2079 /* Else we have enough samples; calculate estimate of
2080 * actual average throughput */
3d79b2a9
RC		 2081 if (window->average_tpt != ((window->success_ratio *
2082 tbl->expected_tpt[index] + 64) / 128)) {
2083 IWL_ERR(priv, "expected_tpt should have been calculated by now\n");
2084 window->average_tpt = ((window->success_ratio *
2085 tbl->expected_tpt[index] + 64) / 128);
2086 }
b481de9c 2087
77626355 2088 /* If we are searching for better modulation mode, check success. */
46f9381a 2089 if (lq_sta->search_better_tbl &&
3ad3b92a 2090 (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
77626355
BC		 2091 /* If good success, continue using the "search" mode;
2092 * no need to send new link quality command, since we're
2093 * continuing to use the setup that we've been trying. */
07bc28ed
GC		 2094 if (window->average_tpt > lq_sta->last_tpt) {
2095
e1623446 2096 IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
07bc28ed
GC		 2097 "suc=%d cur-tpt=%d old-tpt=%d\n",
2098 window->success_ratio,
2099 window->average_tpt,
2100 lq_sta->last_tpt);
2101
2102 if (!is_legacy(tbl->lq_type))
c33104f0 2103 lq_sta->enable_counter = 1;
07bc28ed 2104
77626355 2105 /* Swap tables; "search" becomes "active" */
c33104f0 2106 lq_sta->active_tbl = active_tbl;
b481de9c 2107 current_tpt = window->average_tpt;
77626355
BC		 2108
2109 /* Else poor success; go back to mode in "active" table */
b481de9c 2110 } else {
07bc28ed 2111
e1623446 2112 IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
07bc28ed
GC		 2113 "suc=%d cur-tpt=%d old-tpt=%d\n",
2114 window->success_ratio,
2115 window->average_tpt,
2116 lq_sta->last_tpt);
2117
77626355 2118 /* Nullify "search" table */
b481de9c 2119 tbl->lq_type = LQ_NONE;
77626355
BC		 2120
2121 /* Revert to "active" table */
c33104f0
TW		 2122 active_tbl = lq_sta->active_tbl;
2123 tbl = &(lq_sta->lq_info[active_tbl]);
b481de9c 2124
77626355 2125 /* Revert to "active" rate and throughput info */
e7d326ac 2126 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
c33104f0 2127 current_tpt = lq_sta->last_tpt;
b481de9c 2128
77626355 2129 /* Need to set up a new rate table in uCode */
b481de9c 2130 update_lq = 1;
b481de9c 2131 }
77626355
BC		 2132
2133 /* Either way, we've made a decision; modulation mode
2134 * search is done, allow rate adjustment next time. */
c33104f0 2135 lq_sta->search_better_tbl = 0;
77626355 2136 done_search = 1; /* Don't switch modes below! */
b481de9c
ZY		 2137 goto lq_update;
2138 }
2139
77626355
BC		 2140 /* (Else) not in search of better modulation mode, try for better
2141 * starting rate, while staying in this mode. */
bf403db8 2142 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
b481de9c
ZY		 2143 tbl->lq_type);
2144 low = high_low & 0xff;
2145 high = (high_low >> 8) & 0xff;
2146
c6ec7a9b
AM		 2147 /* If user set max rate, dont allow higher than user constrain */
2148 if ((lq_sta->max_rate_idx != -1) &&
2149 (lq_sta->max_rate_idx < high))
2150 high = IWL_RATE_INVALID;
2151
a5e8b505
GC		 2152 sr = window->success_ratio;
2153
77626355 2154 /* Collect measured throughputs for current and adjacent rates */
b481de9c 2155 current_tpt = window->average_tpt;
b481de9c
ZY		 2156 if (low != IWL_RATE_INVALID)
2157 low_tpt = tbl->win[low].average_tpt;
b481de9c
ZY		 2158 if (high != IWL_RATE_INVALID)
2159 high_tpt = tbl->win[high].average_tpt;
2160
a5e8b505 2161 scale_action = 0;
b481de9c 2162
77626355 2163 /* Too many failures, decrease rate */
a5e8b505 2164 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
e1623446 2165 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
b481de9c 2166 scale_action = -1;
77626355
BC		 2167
2168 /* No throughput measured yet for adjacent rates; try increase. */
b481de9c 2169 } else if ((low_tpt == IWL_INVALID_VALUE) &&
a5e8b505
GC		 2170 (high_tpt == IWL_INVALID_VALUE)) {
2171
2172 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2173 scale_action = 1;
2174 else if (low != IWL_RATE_INVALID)
8fe72311 2175 scale_action = 0;
a5e8b505 2176 }
77626355
BC		 2177
2178 /* Both adjacent throughputs are measured, but neither one has better
2179 * throughput; we're using the best rate, don't change it! */
b481de9c
ZY		 2180 else if ((low_tpt != IWL_INVALID_VALUE) &&
2181 (high_tpt != IWL_INVALID_VALUE) &&
2182 (low_tpt < current_tpt) &&
2183 (high_tpt < current_tpt))
2184 scale_action = 0;
77626355
BC		 2185
2186 /* At least one adjacent rate's throughput is measured,
2187 * and may have better performance. */
b481de9c 2188 else {
77626355 2189 /* Higher adjacent rate's throughput is measured */
b481de9c 2190 if (high_tpt != IWL_INVALID_VALUE) {
77626355 2191 /* Higher rate has better throughput */
a5e8b505
GC		 2192 if (high_tpt > current_tpt &&
2193 sr >= IWL_RATE_INCREASE_TH) {
b481de9c 2194 scale_action = 1;
a5e8b505 2195 } else {
8fe72311 2196 scale_action = 0;
b481de9c 2197 }
77626355
BC		 2198
2199 /* Lower adjacent rate's throughput is measured */
b481de9c 2200 } else if (low_tpt != IWL_INVALID_VALUE) {
77626355 2201 /* Lower rate has better throughput */
b481de9c 2202 if (low_tpt > current_tpt) {
e1623446
TW		 2203 IWL_DEBUG_RATE(priv,
2204 "decrease rate because of low tpt\n");
b481de9c 2205 scale_action = -1;
a5e8b505 2206 } else if (sr >= IWL_RATE_INCREASE_TH) {
b481de9c 2207 scale_action = 1;
a5e8b505 2208 }
b481de9c
ZY		 2209 }
2210 }
2211
77626355
BC		 2212 /* Sanity check; asked for decrease, but success rate or throughput
2213 * has been good at old rate. Don't change it. */
a5e8b505
GC		 2214 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2215 ((sr > IWL_RATE_HIGH_TH) ||
b481de9c 2216 (current_tpt > (100 * tbl->expected_tpt[low]))))
b481de9c 2217 scale_action = 0;
46f9381a
WYG		 2218 if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2219 scale_action = -1;
3ad3b92a 2220 if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
46f9381a
WYG		 2221 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2222 scale_action = -1;
b481de9c
ZY		 2223 switch (scale_action) {
2224 case -1:
77626355 2225 /* Decrease starting rate, update uCode's rate table */
b481de9c
ZY		 2226 if (low != IWL_RATE_INVALID) {
2227 update_lq = 1;
2228 index = low;
2229 }
447fee70 2230
b481de9c
ZY		 2231 break;
2232 case 1:
77626355 2233 /* Increase starting rate, update uCode's rate table */
b481de9c
ZY		 2234 if (high != IWL_RATE_INVALID) {
2235 update_lq = 1;
2236 index = high;
2237 }
2238
2239 break;
2240 case 0:
77626355 2241 /* No change */
b481de9c
ZY		 2242 default:
2243 break;
2244 }
2245
e1623446 2246 IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
b481de9c
ZY		 2247 "high %d type %d\n",
2248 index, scale_action, low, high, tbl->lq_type);
2249
a5e8b505 2250lq_update:
77626355 2251 /* Replace uCode's rate table for the destination station. */
e3139fe7
WYG		 2252 if (update_lq)
2253 rate = rs_update_rate_tbl(priv, lq_sta,
2254 tbl, index, is_green);
77626355 2255
3ad3b92a 2256 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
46f9381a
WYG		 2257 /* Should we stay with this modulation mode,
2258 * or search for a new one? */
2259 rs_stay_in_table(lq_sta);
2260 }
77626355
BC		 2261 /*
2262 * Search for new modulation mode if we're:
2263 * 1) Not changing rates right now
2264 * 2) Not just finishing up a search
2265 * 3) Allowing a new search
2266 */
47cfd463 2267 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
77626355 2268 /* Save current throughput to compare with "search" throughput*/
c33104f0 2269 lq_sta->last_tpt = current_tpt;
b481de9c 2270
77626355
BC		 2271 /* Select a new "search" modulation mode to try.
2272 * If one is found, set up the new "search" table. */
b481de9c 2273 if (is_legacy(tbl->lq_type))
c33104f0 2274 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
b481de9c 2275 else if (is_siso(tbl->lq_type))
c33104f0 2276 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
584a0f00
WYG		 2277 else if (is_mimo2(tbl->lq_type))
2278 rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
b481de9c 2279 else
584a0f00 2280 rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
b481de9c 2281
77626355 2282 /* If new "search" mode was selected, set up in uCode table */
c33104f0 2283 if (lq_sta->search_better_tbl) {
77626355 2284 /* Access the "search" table, clear its history. */
c33104f0 2285 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
b481de9c
ZY		 2286 for (i = 0; i < IWL_RATE_COUNT; i++)
2287 rs_rate_scale_clear_window(&(tbl->win[i]));
2288
77626355 2289 /* Use new "search" start rate */
e7d326ac 2290 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
b481de9c 2291
e1623446 2292 IWL_DEBUG_RATE(priv, "Switch current mcs: %X index: %d\n",
39e88504 2293 tbl->current_rate, index);
07bc28ed 2294 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
fe6b23dd 2295 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC, false);
447fee70
MA		 2296 } else
2297 done_search = 1;
2298 }
b481de9c 2299
447fee70 2300 if (done_search && !lq_sta->stay_in_tbl) {
77626355
BC		 2301 /* If the "active" (non-search) mode was legacy,
2302 * and we've tried switching antennas,
2303 * but we haven't been able to try HT modes (not available),
2304 * stay with best antenna legacy modulation for a while
2305 * before next round of mode comparisons. */
c33104f0 2306 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
de27e64e 2307 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
d6e93399 2308 lq_sta->action_counter > tbl1->max_search) {
e1623446 2309 IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
bf403db8 2310 rs_set_stay_in_table(priv, 1, lq_sta);
b481de9c
ZY		 2311 }
2312
77626355
BC		 2313 /* If we're in an HT mode, and all 3 mode switch actions
2314 * have been tried and compared, stay in this best modulation
2315 * mode for a while before next round of mode comparisons. */
c33104f0 2316 if (lq_sta->enable_counter &&
46f9381a
WYG		 2317 (lq_sta->action_counter >= tbl1->max_search) &&
2318 iwl_ht_enabled(priv)) {
0c11b4de
RR		 2319 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2320 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2321 (tid != MAX_TID_COUNT)) {
86b4766b
WYG		 2322 tid_data =
2323 &priv->stations[lq_sta->lq.sta_id].tid[tid];
2324 if (tid_data->agg.state == IWL_AGG_OFF) {
2325 IWL_DEBUG_RATE(priv,
2326 "try to aggregate tid %d\n",
2327 tid);
2328 rs_tl_turn_on_agg(priv, tid,
2329 lq_sta, sta);
2330 }
b481de9c 2331 }
bf403db8 2332 rs_set_stay_in_table(priv, 0, lq_sta);
b481de9c 2333 }
b481de9c
ZY		 2334 }
2335
2336out:
978785a3 2337 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
b481de9c 2338 i = index;
b7e35008 2339 lq_sta->last_txrate_idx = i;
b481de9c 2340
b481de9c
ZY		 2341 return;
2342}
2343
fe6b23dd
RC		 2344/**
2345 * rs_initialize_lq - Initialize a station's hardware rate table
2346 *
2347 * The uCode's station table contains a table of fallback rates
2348 * for automatic fallback during transmission.
2349 *
2350 * NOTE: This sets up a default set of values. These will be replaced later
2351 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2352 * rc80211_simple.
2353 *
2354 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2355 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2356 * which requires station table entry to exist).
2357 */
c79dd5b5 2358static void rs_initialize_lq(struct iwl_priv *priv,
270243a5 2359 struct ieee80211_conf *conf,
4b7679a5
JB		 2360 struct ieee80211_sta *sta,
2361 struct iwl_lq_sta *lq_sta)
b481de9c 2362{
e227ceac 2363 struct iwl_scale_tbl_info *tbl;
b481de9c 2364 int rate_idx;
aade00ce 2365 int i;
39e88504 2366 u32 rate;
b261793d 2367 u8 use_green = rs_use_green(sta, &priv->current_ht_config);
aade00ce
GC		 2368 u8 active_tbl = 0;
2369 u8 valid_tx_ant;
b481de9c 2370
4b7679a5 2371 if (!sta || !lq_sta)
b481de9c
ZY		 2372 goto out;
2373
b7e35008 2374 i = lq_sta->last_txrate_idx;
b481de9c 2375
aade00ce
GC		 2376 valid_tx_ant = priv->hw_params.valid_tx_ant;
2377
c33104f0
TW		 2378 if (!lq_sta->search_better_tbl)
2379 active_tbl = lq_sta->active_tbl;
b481de9c 2380 else
c33104f0 2381 active_tbl = 1 - lq_sta->active_tbl;
b481de9c 2382
c33104f0 2383 tbl = &(lq_sta->lq_info[active_tbl]);
b481de9c
ZY		 2384
2385 if ((i < 0) || (i >= IWL_RATE_COUNT))
2386 i = 0;
2387
1826dcc0 2388 rate = iwl_rates[i].plcp;
eb48dcaf
WT		 2389 tbl->ant_type = first_antenna(valid_tx_ant);
2390 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
b481de9c
ZY		 2391
2392 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
39e88504 2393 rate |= RATE_MCS_CCK_MSK;
b481de9c 2394
39e88504 2395 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
aade00ce
GC		 2396 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2397 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
b481de9c 2398
978785a3 2399 rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
39e88504 2400 tbl->current_rate = rate;
eecd6e57 2401 rs_set_expected_tpt_table(lq_sta, tbl);
07bc28ed 2402 rs_fill_link_cmd(NULL, lq_sta, rate);
fe6b23dd
RC		 2403 priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2404 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_SYNC, true);
b481de9c
ZY		 2405 out:
2406 return;
2407}
2408
e6a9854b
JB		 2409static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2410 struct ieee80211_tx_rate_control *txrc)
b481de9c
ZY		 2411{
2412
e6a9854b
JB		 2413 struct sk_buff *skb = txrc->skb;
2414 struct ieee80211_supported_band *sband = txrc->sband;
f875f518 2415 struct iwl_priv *priv __maybe_unused = (struct iwl_priv *)priv_r;
e6a9854b 2416 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
417f114b
TW		 2417 struct iwl_lq_sta *lq_sta = priv_sta;
2418 int rate_idx;
b481de9c 2419
e1623446 2420 IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
b481de9c 2421
c6ec7a9b
AM		 2422 /* Get max rate if user set max rate */
2423 if (lq_sta) {
2424 lq_sta->max_rate_idx = txrc->max_rate_idx;
2425 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2426 (lq_sta->max_rate_idx != -1))
2427 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2428 if ((lq_sta->max_rate_idx < 0) ||
2429 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2430 lq_sta->max_rate_idx = -1;
2431 }
2432
fe6b23dd
RC		 2433 /* Treat uninitialized rate scaling data same as non-existing. */
2434 if (lq_sta && !lq_sta->drv) {
2435 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
2436 priv_sta = NULL;
2437 }
2438
514d65c1 2439 /* Send management frames and NO_ACK data using lowest rate. */
4c6d4f5c 2440 if (rate_control_send_low(sta, priv_sta, txrc))
4b7679a5 2441 return;
b481de9c 2442
417f114b 2443 rate_idx = lq_sta->last_txrate_idx;
b481de9c 2444
a9c146b3 2445 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
417f114b 2446 rate_idx -= IWL_FIRST_OFDM_RATE;
a9c146b3
WYG		 2447 /* 6M and 9M shared same MCS index */
2448 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2449 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2450 IWL_RATE_MIMO3_6M_PLCP)
2451 rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2452 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2453 IWL_RATE_MIMO2_6M_PLCP)
2454 rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2455 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2456 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2457 info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2458 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2459 info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
7aafef1c 2460 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
a9c146b3
WYG		 2461 info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2462 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2463 info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2464 } else {
5027309b
DH		 2465 /* Check for invalid rates */
2466 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2467 ((sband->band == IEEE80211_BAND_5GHZ) &&
2468 (rate_idx < IWL_FIRST_OFDM_RATE)))
a9c146b3 2469 rate_idx = rate_lowest_index(sband, sta);
5027309b 2470 /* On valid 5 GHz rate, adjust index */
a9c146b3
WYG		 2471 else if (sband->band == IEEE80211_BAND_5GHZ)
2472 rate_idx -= IWL_FIRST_OFDM_RATE;
7ebaeff8 2473 info->control.rates[0].flags = 0;
a9c146b3 2474 }
417f114b 2475 info->control.rates[0].idx = rate_idx;
a9c146b3 2476
b481de9c
ZY		 2477}
2478
4b7679a5
JB		 2479static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2480 gfp_t gfp)
b481de9c 2481{
e227ceac 2482 struct iwl_lq_sta *lq_sta;
8d9698b3 2483 struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv;
bf403db8 2484 struct iwl_priv *priv;
b481de9c 2485
bf403db8 2486 priv = (struct iwl_priv *)priv_rate;
e1623446 2487 IWL_DEBUG_RATE(priv, "create station rate scale window\n");
b481de9c 2488
8d9698b3 2489 lq_sta = &sta_priv->lq_sta;
b481de9c 2490
c33104f0 2491 return lq_sta;
b481de9c
ZY		 2492}
2493
fe6b23dd
RC		 2494/*
2495 * Called after adding a new station to initialize rate scaling
2496 */
2497void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id)
b481de9c
ZY		 2498{
2499 int i, j;
fe6b23dd 2500 struct ieee80211_hw *hw = priv->hw;
4b7679a5 2501 struct ieee80211_conf *conf = &priv->hw->conf;
7869b0ea 2502 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
fe6b23dd
RC		 2503 struct iwl_station_priv *sta_priv;
2504 struct iwl_lq_sta *lq_sta;
2505 struct ieee80211_supported_band *sband;
2506
2507 sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2508 lq_sta = &sta_priv->lq_sta;
2509 sband = hw->wiphy->bands[conf->channel->band];
b481de9c 2510
fe6b23dd
RC		 2511
2512 lq_sta->lq.sta_id = sta_id;
5ad13f8c
RC		 2513
2514 for (j = 0; j < LQ_SIZE; j++)
2515 for (i = 0; i < IWL_RATE_COUNT; i++)
2516 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2517
c33104f0 2518 lq_sta->flush_timer = 0;
4b7679a5 2519 lq_sta->supp_rates = sta->supp_rates[sband->band];
b481de9c
ZY		 2520 for (j = 0; j < LQ_SIZE; j++)
2521 for (i = 0; i < IWL_RATE_COUNT; i++)
3ac7f146 2522 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
b481de9c 2523
fe6b23dd
RC		 2524 IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n",
2525 sta_id);
b481de9c
ZY		 2526 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2527 * the lowest or the highest rate.. Could consider using RSSI from
2528 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2529 * after assoc.. */
2530
c33104f0 2531 lq_sta->is_dup = 0;
c6ec7a9b 2532 lq_sta->max_rate_idx = -1;
7d049e5a 2533 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
b261793d 2534 lq_sta->is_green = rs_use_green(sta, &priv->current_ht_config);
39e88504 2535 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
8318d78a 2536 lq_sta->band = priv->band;
77626355
BC		 2537 /*
2538 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2539 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2540 */
7869b0ea
DH		 2541 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2542 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
c33104f0 2543 lq_sta->active_siso_rate &= ~((u16)0x2);
fde0db31 2544 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
b481de9c 2545
77626355 2546 /* Same here */
7869b0ea
DH		 2547 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2548 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
fde0db31
GC		 2549 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2550 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2551
7869b0ea
DH		 2552 lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2553 lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
fde0db31
GC		 2554 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2555 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2556
e1623446 2557 IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
c33104f0 2558 lq_sta->active_siso_rate,
fde0db31
GC		 2559 lq_sta->active_mimo2_rate,
2560 lq_sta->active_mimo3_rate);
2561
a96a27f9 2562 /* These values will be overridden later */
3a23d695
WYG		 2563 lq_sta->lq.general_params.single_stream_ant_msk =
2564 first_antenna(priv->hw_params.valid_tx_ant);
2565 lq_sta->lq.general_params.dual_stream_ant_msk =
2566 priv->hw_params.valid_tx_ant &
2567 ~first_antenna(priv->hw_params.valid_tx_ant);
2568 if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2569 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2570 } else if (num_of_ant(priv->hw_params.valid_tx_ant) == 2) {
2571 lq_sta->lq.general_params.dual_stream_ant_msk =
2572 priv->hw_params.valid_tx_ant;
2573 }
07bc28ed 2574
0c11b4de
RR		 2575 /* as default allow aggregation for all tids */
2576 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
c33104f0 2577 lq_sta->drv = priv;
b481de9c 2578
5027309b
DH		 2579 /* Set last_txrate_idx to lowest rate */
2580 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2581 if (sband->band == IEEE80211_BAND_5GHZ)
2582 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
e3949d62 2583 lq_sta->is_agg = 0;
d5e49036 2584
4b7679a5 2585 rs_initialize_lq(priv, conf, sta, lq_sta);
b481de9c
ZY		 2586}
2587
46f9381a 2588static void rs_fill_link_cmd(struct iwl_priv *priv,
e227ceac 2589 struct iwl_lq_sta *lq_sta, u32 new_rate)
b481de9c 2590{
e227ceac 2591 struct iwl_scale_tbl_info tbl_type;
b481de9c 2592 int index = 0;
b481de9c 2593 int rate_idx;
1b696de2 2594 int repeat_rate = 0;
aade00ce 2595 u8 ant_toggle_cnt = 0;
b481de9c 2596 u8 use_ht_possible = 1;
aade00ce 2597 u8 valid_tx_ant = 0;
07bc28ed 2598 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
b481de9c 2599
77626355 2600 /* Override starting rate (index 0) if needed for debug purposes */
39e88504 2601 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
98d7e09a 2602
39e88504 2603 /* Interpret new_rate (rate_n_flags) */
aade00ce 2604 memset(&tbl_type, 0, sizeof(tbl_type));
39e88504 2605 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
b481de9c
ZY		 2606 &tbl_type, &rate_idx);
2607
77626355 2608 /* How many times should we repeat the initial rate? */
b481de9c 2609 if (is_legacy(tbl_type.lq_type)) {
aade00ce 2610 ant_toggle_cnt = 1;
1b696de2 2611 repeat_rate = IWL_NUMBER_TRY;
aade00ce 2612 } else {
1b696de2 2613 repeat_rate = IWL_HT_NUMBER_TRY;
aade00ce 2614 }
b481de9c
ZY		 2615
2616 lq_cmd->general_params.mimo_delimiter =
2617 is_mimo(tbl_type.lq_type) ? 1 : 0;
77626355
BC		 2618
2619 /* Fill 1st table entry (index 0) */
39e88504 2620 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
b481de9c 2621
07bc28ed
GC		 2622 if (num_of_ant(tbl_type.ant_type) == 1) {
2623 lq_cmd->general_params.single_stream_ant_msk =
2624 tbl_type.ant_type;
2625 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2626 lq_cmd->general_params.dual_stream_ant_msk =
2627 tbl_type.ant_type;
2628 } /* otherwise we don't modify the existing value */
b481de9c
ZY		 2629
2630 index++;
1b696de2 2631 repeat_rate--;
b481de9c 2632
aade00ce
GC		 2633 if (priv)
2634 valid_tx_ant = priv->hw_params.valid_tx_ant;
2635
77626355 2636 /* Fill rest of rate table */
b481de9c 2637 while (index < LINK_QUAL_MAX_RETRY_NUM) {
77626355
BC		 2638 /* Repeat initial/next rate.
2639 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2640 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
1b696de2 2641 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
b481de9c 2642 if (is_legacy(tbl_type.lq_type)) {
aade00ce
GC		 2643 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2644 ant_toggle_cnt++;
2645 else if (priv &&
2646 rs_toggle_antenna(valid_tx_ant,
2647 &new_rate, &tbl_type))
2648 ant_toggle_cnt = 1;
2649}
98d7e09a 2650
77626355 2651 /* Override next rate if needed for debug purposes */
c33104f0 2652 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
77626355
BC		 2653
2654 /* Fill next table entry */
b481de9c 2655 lq_cmd->rs_table[index].rate_n_flags =
39e88504 2656 cpu_to_le32(new_rate);
1b696de2 2657 repeat_rate--;
b481de9c
ZY		 2658 index++;
2659 }
2660
39e88504 2661 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
b481de9c
ZY		 2662 &rate_idx);
2663
77626355
BC		 2664 /* Indicate to uCode which entries might be MIMO.
2665 * If initial rate was MIMO, this will finally end up
2666 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
b481de9c
ZY		 2667 if (is_mimo(tbl_type.lq_type))
2668 lq_cmd->general_params.mimo_delimiter = index;
2669
77626355 2670 /* Get next rate */
39e88504
GC		 2671 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2672 use_ht_possible);
b481de9c 2673
77626355 2674 /* How many times should we repeat the next rate? */
b481de9c 2675 if (is_legacy(tbl_type.lq_type)) {
aade00ce
GC		 2676 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2677 ant_toggle_cnt++;
2678 else if (priv &&
2679 rs_toggle_antenna(valid_tx_ant,
2680 &new_rate, &tbl_type))
2681 ant_toggle_cnt = 1;
2682
1b696de2 2683 repeat_rate = IWL_NUMBER_TRY;
aade00ce 2684 } else {
1b696de2 2685 repeat_rate = IWL_HT_NUMBER_TRY;
aade00ce 2686 }
b481de9c 2687
77626355
BC		 2688 /* Don't allow HT rates after next pass.
2689 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
b481de9c
ZY		 2690 use_ht_possible = 0;
2691
77626355 2692 /* Override next rate if needed for debug purposes */
c33104f0 2693 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
77626355
BC		 2694
2695 /* Fill next table entry */
39e88504 2696 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
b481de9c
ZY		 2697
2698 index++;
1b696de2 2699 repeat_rate--;
b481de9c
ZY		 2700 }
2701
4d80d721 2702 lq_cmd->agg_params.agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
13c33a09
WYG		 2703 lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2704 lq_cmd->agg_params.agg_time_limit =
2705 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
b481de9c
ZY		 2706}
2707
4b7679a5 2708static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
b481de9c 2709{
4b7679a5 2710 return hw->priv;
b481de9c
ZY		 2711}
2712/* rate scale requires free function to be implemented */
2713static void rs_free(void *priv_rate)
2714{
2715 return;
2716}
2717
4b7679a5
JB		 2718static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
2719 void *priv_sta)
b481de9c 2720{
45527c2c 2721 struct iwl_priv *priv __maybe_unused = priv_r;
b481de9c 2722
e1623446 2723 IWL_DEBUG_RATE(priv, "enter\n");
e1623446 2724 IWL_DEBUG_RATE(priv, "leave\n");
b481de9c
ZY		 2725}
2726
2727
93dc646a 2728#ifdef CONFIG_MAC80211_DEBUGFS
5ae212c9
ZY		 2729static int open_file_generic(struct inode *inode, struct file *file)
2730{
2731 file->private_data = inode->i_private;
2732 return 0;
2733}
e227ceac
TW		 2734static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2735 u32 *rate_n_flags, int index)
98d7e09a 2736{
bf403db8 2737 struct iwl_priv *priv;
3c4955f8
WYG		 2738 u8 valid_tx_ant;
2739 u8 ant_sel_tx;
bf403db8
EK		 2740
2741 priv = lq_sta->drv;
3c4955f8 2742 valid_tx_ant = priv->hw_params.valid_tx_ant;
39e88504 2743 if (lq_sta->dbg_fixed_rate) {
3c4955f8
WYG		 2744 ant_sel_tx =
2745 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
2746 >> RATE_MCS_ANT_POS);
2747 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
39e88504 2748 *rate_n_flags = lq_sta->dbg_fixed_rate;
3c4955f8 2749 IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
39e88504 2750 } else {
3c4955f8
WYG		 2751 lq_sta->dbg_fixed_rate = 0;
2752 IWL_ERR(priv,
2753 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
2754 ant_sel_tx, valid_tx_ant);
2755 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
39e88504 2756 }
39e88504 2757 } else {
e1623446 2758 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
98d7e09a 2759 }
98d7e09a 2760}
5ae212c9 2761
98d7e09a
ZY		 2762static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2763 const char __user *user_buf, size_t count, loff_t *ppos)
2764{
e227ceac 2765 struct iwl_lq_sta *lq_sta = file->private_data;
bf403db8 2766 struct iwl_priv *priv;
98d7e09a
ZY		 2767 char buf[64];
2768 int buf_size;
2769 u32 parsed_rate;
2770
bf403db8 2771 priv = lq_sta->drv;
98d7e09a
ZY		 2772 memset(buf, 0, sizeof(buf));
2773 buf_size = min(count, sizeof(buf) - 1);
2774 if (copy_from_user(buf, user_buf, buf_size))
2775 return -EFAULT;
2776
2777 if (sscanf(buf, "%x", &parsed_rate) == 1)
39e88504 2778 lq_sta->dbg_fixed_rate = parsed_rate;
98d7e09a 2779 else
39e88504 2780 lq_sta->dbg_fixed_rate = 0;
98d7e09a 2781
39e88504
GC		 2782 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2783 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2784 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2785 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
98d7e09a 2786
e1623446 2787 IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
39e88504 2788 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
98d7e09a 2789
39e88504 2790 if (lq_sta->dbg_fixed_rate) {
07bc28ed 2791 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
fe6b23dd 2792 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC, false);
98d7e09a
ZY		 2793 }
2794
2795 return count;
2796}
0209dc11 2797
5ae212c9
ZY		 2798static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2799 char __user *user_buf, size_t count, loff_t *ppos)
2800{
a412c804 2801 char *buff;
5ae212c9
ZY		 2802 int desc = 0;
2803 int i = 0;
12b96817 2804 int index = 0;
a412c804 2805 ssize_t ret;
5ae212c9 2806
e227ceac 2807 struct iwl_lq_sta *lq_sta = file->private_data;
d8ae4f52 2808 struct iwl_priv *priv;
adb7b5e6 2809 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
5ae212c9 2810
d8ae4f52 2811 priv = lq_sta->drv;
a412c804
FS		 2812 buff = kmalloc(1024, GFP_KERNEL);
2813 if (!buff)
2814 return -ENOMEM;
2815
c33104f0 2816 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
98d7e09a 2817 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
c33104f0 2818 lq_sta->total_failed, lq_sta->total_success,
39e88504 2819 lq_sta->active_legacy_rate);
98d7e09a 2820 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
39e88504 2821 lq_sta->dbg_fixed_rate);
d8ae4f52
WYG		 2822 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
2823 (priv->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
2824 (priv->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
2825 (priv->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
adb7b5e6
WYG		 2826 desc += sprintf(buff+desc, "lq type %s\n",
2827 (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
2828 if (is_Ht(tbl->lq_type)) {
2829 desc += sprintf(buff+desc, " %s",
2830 (is_siso(tbl->lq_type)) ? "SISO" :
2831 ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
2832 desc += sprintf(buff+desc, " %s",
7aafef1c 2833 (tbl->is_ht40) ? "40MHz" : "20MHz");
e3949d62
DH		 2834 desc += sprintf(buff+desc, " %s %s %s\n", (tbl->is_SGI) ? "SGI" : "",
2835 (lq_sta->is_green) ? "GF enabled" : "",
2836 (lq_sta->is_agg) ? "AGG on" : "");
adb7b5e6 2837 }
12b96817
WYG		 2838 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
2839 lq_sta->last_rate_n_flags);
5ae212c9
ZY		 2840 desc += sprintf(buff+desc, "general:"
2841 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
c33104f0
TW		 2842 lq_sta->lq.general_params.flags,
2843 lq_sta->lq.general_params.mimo_delimiter,
2844 lq_sta->lq.general_params.single_stream_ant_msk,
2845 lq_sta->lq.general_params.dual_stream_ant_msk);
5ae212c9
ZY		 2846
2847 desc += sprintf(buff+desc, "agg:"
2848 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
c33104f0
TW		 2849 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2850 lq_sta->lq.agg_params.agg_dis_start_th,
2851 lq_sta->lq.agg_params.agg_frame_cnt_limit);
5ae212c9
ZY		 2852
2853 desc += sprintf(buff+desc,
2854 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
c33104f0
TW		 2855 lq_sta->lq.general_params.start_rate_index[0],
2856 lq_sta->lq.general_params.start_rate_index[1],
2857 lq_sta->lq.general_params.start_rate_index[2],
2858 lq_sta->lq.general_params.start_rate_index[3]);
5ae212c9 2859
12b96817
WYG		 2860 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2861 index = iwl_hwrate_to_plcp_idx(
2862 le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2863 if (is_legacy(tbl->lq_type)) {
2864 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
2865 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
2866 iwl_rate_mcs[index].mbps);
2867 } else {
2868 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
2869 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
2870 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
2871 }
2872 }
5ae212c9 2873
a412c804
FS		 2874 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2875 kfree(buff);
2876 return ret;
5ae212c9
ZY		 2877}
2878
2879static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
98d7e09a 2880 .write = rs_sta_dbgfs_scale_table_write,
5ae212c9
ZY		 2881 .read = rs_sta_dbgfs_scale_table_read,
2882 .open = open_file_generic,
2883};
0209dc11
ZY		 2884static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2885 char __user *user_buf, size_t count, loff_t *ppos)
2886{
a412c804 2887 char *buff;
0209dc11
ZY		 2888 int desc = 0;
2889 int i, j;
a412c804 2890 ssize_t ret;
0209dc11 2891
e227ceac 2892 struct iwl_lq_sta *lq_sta = file->private_data;
a412c804
FS		 2893
2894 buff = kmalloc(1024, GFP_KERNEL);
2895 if (!buff)
2896 return -ENOMEM;
2897
0209dc11 2898 for (i = 0; i < LQ_SIZE; i++) {
7aafef1c
WYG		 2899 desc += sprintf(buff+desc,
2900 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
0209dc11 2901 "rate=0x%X\n",
c3056065 2902 lq_sta->active_tbl == i ? "*" : "x",
c33104f0
TW		 2903 lq_sta->lq_info[i].lq_type,
2904 lq_sta->lq_info[i].is_SGI,
7aafef1c 2905 lq_sta->lq_info[i].is_ht40,
c33104f0 2906 lq_sta->lq_info[i].is_dup,
2681b20b 2907 lq_sta->is_green,
39e88504 2908 lq_sta->lq_info[i].current_rate);
0209dc11
ZY		 2909 for (j = 0; j < IWL_RATE_COUNT; j++) {
2910 desc += sprintf(buff+desc,
c33104f0
TW		 2911 "counter=%d success=%d %%=%d\n",
2912 lq_sta->lq_info[i].win[j].counter,
2913 lq_sta->lq_info[i].win[j].success_counter,
2914 lq_sta->lq_info[i].win[j].success_ratio);
0209dc11
ZY		 2915 }
2916 }
a412c804
FS		 2917 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2918 kfree(buff);
2919 return ret;
0209dc11
ZY		 2920}
2921
2922static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2923 .read = rs_sta_dbgfs_stats_table_read,
2924 .open = open_file_generic,
2925};
5ae212c9 2926
38167459
WYG		 2927static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
2928 char __user *user_buf, size_t count, loff_t *ppos)
2929{
2930 char buff[120];
2931 int desc = 0;
2932 ssize_t ret;
2933
2934 struct iwl_lq_sta *lq_sta = file->private_data;
2935 struct iwl_priv *priv;
2936 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
2937
2938 priv = lq_sta->drv;
2939
2940 if (is_Ht(tbl->lq_type))
2941 desc += sprintf(buff+desc,
2942 "Bit Rate= %d Mb/s\n",
2943 tbl->expected_tpt[lq_sta->last_txrate_idx]);
2944 else
2945 desc += sprintf(buff+desc,
2946 "Bit Rate= %d Mb/s\n",
2947 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
38167459
WYG		 2948
2949 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2950 return ret;
2951}
2952
2953static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
2954 .read = rs_sta_dbgfs_rate_scale_data_read,
2955 .open = open_file_generic,
2956};
2957
93dc646a
ZY		 2958static void rs_add_debugfs(void *priv, void *priv_sta,
2959 struct dentry *dir)
2960{
e227ceac 2961 struct iwl_lq_sta *lq_sta = priv_sta;
c33104f0 2962 lq_sta->rs_sta_dbgfs_scale_table_file =
43e85115 2963 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
c33104f0
TW		 2964 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2965 lq_sta->rs_sta_dbgfs_stats_table_file =
43e85115 2966 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
c33104f0 2967 lq_sta, &rs_sta_dbgfs_stats_table_ops);
38167459 2968 lq_sta->rs_sta_dbgfs_rate_scale_data_file =
43e85115 2969 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
38167459 2970 lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
0c11b4de 2971 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
43e85115 2972 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
0c11b4de 2973 &lq_sta->tx_agg_tid_en);
0c11b4de 2974
93dc646a
ZY		 2975}
2976
2977static void rs_remove_debugfs(void *priv, void *priv_sta)
2978{
e227ceac 2979 struct iwl_lq_sta *lq_sta = priv_sta;
c33104f0
TW		 2980 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2981 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
38167459 2982 debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
0c11b4de 2983 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
93dc646a
ZY		 2984}
2985#endif
2986
fe6b23dd
RC		 2987/*
2988 * Initialization of rate scaling information is done by driver after
2989 * the station is added. Since mac80211 calls this function before a
2990 * station is added we ignore it.
2991 */
2992static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband,
2993 struct ieee80211_sta *sta, void *priv_sta)
2994{
2995}
b481de9c
ZY		 2996static struct rate_control_ops rs_ops = {
2997 .module = NULL,
2998 .name = RS_NAME,
2999 .tx_status = rs_tx_status,
3000 .get_rate = rs_get_rate,
fe6b23dd 3001 .rate_init = rs_rate_init_stub,
b481de9c
ZY		 3002 .alloc = rs_alloc,
3003 .free = rs_free,
3004 .alloc_sta = rs_alloc_sta,
3005 .free_sta = rs_free_sta,
93dc646a
ZY		 3006#ifdef CONFIG_MAC80211_DEBUGFS
3007 .add_sta_debugfs = rs_add_debugfs,
3008 .remove_sta_debugfs = rs_remove_debugfs,
3009#endif
b481de9c
ZY		 3010};
3011
e227ceac 3012int iwlagn_rate_control_register(void)
b481de9c 3013{
897e1cf2 3014 return ieee80211_rate_control_register(&rs_ops);
b481de9c
ZY		 3015}
3016
e227ceac 3017void iwlagn_rate_control_unregister(void)
b481de9c
ZY		 3018{
3019 ieee80211_rate_control_unregister(&rs_ops);
3020}
3021
Clone of davem's net-next-2.6 tree