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iwlwifi: configure HT40 channels in iwl_mac_config
[mirror_ubuntu-zesty-kernel.git] / drivers / net / wireless / iwlwifi / iwl-agn-rs.c
CommitLineData
b481de9c
ZY		 1/******************************************************************************
2 *
01f8162a 3 * Copyright(c) 2005 - 2009 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>
29#include <linux/wireless.h>
30#include <net/mac80211.h>
b481de9c
ZY		 31
32#include <linux/netdevice.h>
33#include <linux/etherdevice.h>
34#include <linux/delay.h>
35
36#include <linux/workqueue.h>
37
3e0d4cb1 38#include "iwl-dev.h"
be1f3ab6 39#include "iwl-sta.h"
857485c0 40#include "iwl-core.h"
b481de9c 41
e227ceac 42#define RS_NAME "iwl-agn-rs"
b481de9c 43
aade00ce 44#define NUM_TRY_BEFORE_ANT_TOGGLE 1
b481de9c
ZY		 45#define IWL_NUMBER_TRY 1
46#define IWL_HT_NUMBER_TRY 3
47
77626355
BC		 48#define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
49#define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
50#define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
51
7d049e5a
AM		 52/* max allowed rate miss before sync LQ cmd */
53#define IWL_MISSED_RATE_MAX 15
77626355 54/* max time to accum history 2 seconds */
447fee70 55#define IWL_RATE_SCALE_FLUSH_INTVL (3*HZ)
b481de9c
ZY		 56
57static u8 rs_ht_to_legacy[] = {
58 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
59 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
60 IWL_RATE_6M_INDEX,
61 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
62 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
63 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
64 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
65};
66
aade00ce
GC		 67static const u8 ant_toggle_lookup[] = {
68 /*ANT_NONE -> */ ANT_NONE,
69 /*ANT_A -> */ ANT_B,
70 /*ANT_B -> */ ANT_C,
71 /*ANT_AB -> */ ANT_BC,
72 /*ANT_C -> */ ANT_A,
73 /*ANT_AC -> */ ANT_AB,
74 /*ANT_BC -> */ ANT_AC,
75 /*ANT_ABC -> */ ANT_ABC,
76};
77
77626355 78/**
e227ceac 79 * struct iwl_rate_scale_data -- tx success history for one rate
77626355 80 */
e227ceac 81struct iwl_rate_scale_data {
77626355
BC		 82 u64 data; /* bitmap of successful frames */
83 s32 success_counter; /* number of frames successful */
84 s32 success_ratio; /* per-cent * 128 */
85 s32 counter; /* number of frames attempted */
86 s32 average_tpt; /* success ratio * expected throughput */
b481de9c
ZY		 87 unsigned long stamp;
88};
89
77626355 90/**
e227ceac 91 * struct iwl_scale_tbl_info -- tx params and success history for all rates
77626355 92 *
e227ceac 93 * There are two of these in struct iwl_lq_sta,
77626355
BC		 94 * one for "active", and one for "search".
95 */
e227ceac 96struct iwl_scale_tbl_info {
fde0db31
GC		 97 enum iwl_table_type lq_type;
98 u8 ant_type;
77626355 99 u8 is_SGI; /* 1 = short guard interval */
7aafef1c 100 u8 is_ht40; /* 1 = 40 MHz channel width */
77626355
BC		 101 u8 is_dup; /* 1 = duplicated data streams */
102 u8 action; /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
d6e93399 103 u8 max_search; /* maximun number of tables we can search */
77626355 104 s32 *expected_tpt; /* throughput metrics; expected_tpt_G, etc. */
39e88504 105 u32 current_rate; /* rate_n_flags, uCode API format */
e227ceac 106 struct iwl_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
b481de9c
ZY		 107};
108
e227ceac 109struct iwl_traffic_load {
0c11b4de
RR		 110 unsigned long time_stamp; /* age of the oldest statistics */
111 u32 packet_count[TID_QUEUE_MAX_SIZE]; /* packet count in this time
112 * slice */
113 u32 total; /* total num of packets during the
114 * last TID_MAX_TIME_DIFF */
115 u8 queue_count; /* number of queues that has
116 * been used since the last cleanup */
117 u8 head; /* start of the circular buffer */
118};
119
77626355 120/**
e227ceac 121 * struct iwl_lq_sta -- driver's rate scaling private structure
77626355
BC		 122 *
123 * Pointer to this gets passed back and forth between driver and mac80211.
124 */
e227ceac 125struct iwl_lq_sta {
77626355
BC		 126 u8 active_tbl; /* index of active table, range 0-1 */
127 u8 enable_counter; /* indicates HT mode */
128 u8 stay_in_tbl; /* 1: disallow, 0: allow search for new mode */
129 u8 search_better_tbl; /* 1: currently trying alternate mode */
b481de9c 130 s32 last_tpt;
77626355
BC		 131
132 /* The following determine when to search for a new mode */
b481de9c 133 u32 table_count_limit;
77626355
BC		 134 u32 max_failure_limit; /* # failed frames before new search */
135 u32 max_success_limit; /* # successful frames before new search */
b481de9c 136 u32 table_count;
77626355
BC		 137 u32 total_failed; /* total failed frames, any/all rates */
138 u32 total_success; /* total successful frames, any/all rates */
447fee70 139 u64 flush_timer; /* time staying in mode before new search */
77626355
BC		 140
141 u8 action_counter; /* # mode-switch actions tried */
b481de9c
ZY		 142 u8 is_green;
143 u8 is_dup;
8318d78a 144 enum ieee80211_band band;
b481de9c 145 u8 ibss_sta_added;
77626355
BC		 146
147 /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
02dede04 148 u32 supp_rates;
39e88504 149 u16 active_legacy_rate;
b481de9c 150 u16 active_siso_rate;
fde0db31
GC		 151 u16 active_mimo2_rate;
152 u16 active_mimo3_rate;
b481de9c 153 u16 active_rate_basic;
c6ec7a9b 154 s8 max_rate_idx; /* Max rate set by user */
7d049e5a 155 u8 missed_rate_counter;
77626355 156
66c73db7 157 struct iwl_link_quality_cmd lq;
e227ceac
TW		 158 struct iwl_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
159 struct iwl_traffic_load load[TID_MAX_LOAD_COUNT];
0c11b4de 160 u8 tx_agg_tid_en;
5ae212c9 161#ifdef CONFIG_MAC80211_DEBUGFS
98d7e09a 162 struct dentry *rs_sta_dbgfs_scale_table_file;
0209dc11 163 struct dentry *rs_sta_dbgfs_stats_table_file;
38167459 164 struct dentry *rs_sta_dbgfs_rate_scale_data_file;
0c11b4de 165 struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
39e88504 166 u32 dbg_fixed_rate;
5ae212c9 167#endif
6243065d 168 struct iwl_priv *drv;
b7e35008
JB		 169
170 /* used to be in sta_info */
171 int last_txrate_idx;
12b96817
WYG		 172 /* last tx rate_n_flags */
173 u32 last_rate_n_flags;
b481de9c
ZY		 174};
175
c79dd5b5 176static void rs_rate_scale_perform(struct iwl_priv *priv,
514d65c1 177 struct sk_buff *skb,
4b7679a5
JB		 178 struct ieee80211_sta *sta,
179 struct iwl_lq_sta *lq_sta);
46f9381a 180static void rs_fill_link_cmd(struct iwl_priv *priv,
e227ceac 181 struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
b481de9c
ZY		 182
183
98d7e09a 184#ifdef CONFIG_MAC80211_DEBUGFS
e227ceac
TW		 185static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
186 u32 *rate_n_flags, int index);
98d7e09a 187#else
e227ceac
TW		 188static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
189 u32 *rate_n_flags, int index)
98d7e09a
ZY		 190{}
191#endif
77626355
BC		 192
193/*
194 * Expected throughput metrics for following rates:
195 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
196 * "G" is the only table that supports CCK (the first 4 rates).
197 */
584a0f00 198
b481de9c
ZY		 199static s32 expected_tpt_A[IWL_RATE_COUNT] = {
200 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
201};
202
203static s32 expected_tpt_G[IWL_RATE_COUNT] = {
204 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
205};
206
207static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
208 0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
209};
210
211static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
212 0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
213};
214
584a0f00 215static s32 expected_tpt_mimo2_20MHz[IWL_RATE_COUNT] = {
b481de9c
ZY		 216 0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
217};
218
584a0f00 219static s32 expected_tpt_mimo2_20MHzSGI[IWL_RATE_COUNT] = {
b481de9c
ZY		 220 0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
221};
222
223static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
224 0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
225};
226
227static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
228 0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
229};
230
584a0f00 231static s32 expected_tpt_mimo2_40MHz[IWL_RATE_COUNT] = {
b481de9c
ZY		 232 0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
233};
234
584a0f00 235static s32 expected_tpt_mimo2_40MHzSGI[IWL_RATE_COUNT] = {
b481de9c
ZY		 236 0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
237};
238
584a0f00
WYG		 239/* Expected throughput metric MIMO3 */
240static s32 expected_tpt_mimo3_20MHz[IWL_RATE_COUNT] = {
241 0, 0, 0, 0, 99, 99, 153, 186, 208, 239, 256, 263, 268
242};
243
244static s32 expected_tpt_mimo3_20MHzSGI[IWL_RATE_COUNT] = {
245 0, 0, 0, 0, 106, 106, 162, 194, 215, 246, 262, 268, 273
246};
247
248static s32 expected_tpt_mimo3_40MHz[IWL_RATE_COUNT] = {
249 0, 0, 0, 0, 152, 152, 211, 239, 255, 279, 290, 294, 297
250};
251
252static s32 expected_tpt_mimo3_40MHzSGI[IWL_RATE_COUNT] = {
253 0, 0, 0, 0, 160, 160, 219, 245, 261, 284, 294, 297, 300
254};
255
12b96817
WYG		 256/* mbps, mcs */
257const static struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
258 {"1", ""},
259 {"2", ""},
260 {"5.5", ""},
261 {"11", ""},
262 {"6", "BPSK 1/2"},
263 {"9", "BPSK 1/2"},
264 {"12", "QPSK 1/2"},
265 {"18", "QPSK 3/4"},
266 {"24", "16QAM 1/2"},
267 {"36", "16QAM 3/4"},
268 {"48", "64QAM 2/3"},
269 {"54", "64QAM 3/4"},
270 {"60", "64QAM 5/6"}
271};
272
a9c146b3
WYG		 273#define MCS_INDEX_PER_STREAM (8)
274
39e88504 275static inline u8 rs_extract_rate(u32 rate_n_flags)
b481de9c
ZY		 276{
277 return (u8)(rate_n_flags & 0xFF);
278}
279
e227ceac 280static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
b481de9c
ZY		 281{
282 window->data = 0;
283 window->success_counter = 0;
284 window->success_ratio = IWL_INVALID_VALUE;
285 window->counter = 0;
286 window->average_tpt = IWL_INVALID_VALUE;
287 window->stamp = 0;
b481de9c
ZY		 288}
289
aade00ce
GC		 290static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
291{
3ac7f146 292 return (ant_type & valid_antenna) == ant_type;
aade00ce
GC		 293}
294
0c11b4de
RR		 295/*
296 * removes the old data from the statistics. All data that is older than
297 * TID_MAX_TIME_DIFF, will be deleted.
298 */
e227ceac 299static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
0c11b4de
RR		 300{
301 /* The oldest age we want to keep */
302 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
303
304 while (tl->queue_count &&
305 (tl->time_stamp < oldest_time)) {
306 tl->total -= tl->packet_count[tl->head];
307 tl->packet_count[tl->head] = 0;
308 tl->time_stamp += TID_QUEUE_CELL_SPACING;
309 tl->queue_count--;
310 tl->head++;
311 if (tl->head >= TID_QUEUE_MAX_SIZE)
312 tl->head = 0;
313 }
314}
315
316/*
317 * increment traffic load value for tid and also remove
318 * any old values if passed the certain time period
319 */
e227ceac 320static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
faa29718 321 struct ieee80211_hdr *hdr)
0c11b4de
RR		 322{
323 u32 curr_time = jiffies_to_msecs(jiffies);
324 u32 time_diff;
325 s32 index;
e227ceac 326 struct iwl_traffic_load *tl = NULL;
54dbb525 327 u8 tid;
0c11b4de 328
417f114b 329 if (ieee80211_is_data_qos(hdr->frame_control)) {
fd7c8a40 330 u8 *qc = ieee80211_get_qos_ctl(hdr);
54dbb525
TW		 331 tid = qc[0] & 0xf;
332 } else
faa29718 333 return MAX_TID_COUNT;
0c11b4de 334
e6a6cf4c
RC		 335 if (unlikely(tid >= TID_MAX_LOAD_COUNT))
336 return MAX_TID_COUNT;
337
0c11b4de
RR		 338 tl = &lq_data->load[tid];
339
340 curr_time -= curr_time % TID_ROUND_VALUE;
341
342 /* Happens only for the first packet. Initialize the data */
343 if (!(tl->queue_count)) {
344 tl->total = 1;
345 tl->time_stamp = curr_time;
346 tl->queue_count = 1;
347 tl->head = 0;
348 tl->packet_count[0] = 1;
faa29718 349 return MAX_TID_COUNT;
0c11b4de
RR		 350 }
351
352 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
353 index = time_diff / TID_QUEUE_CELL_SPACING;
354
355 /* The history is too long: remove data that is older than */
356 /* TID_MAX_TIME_DIFF */
357 if (index >= TID_QUEUE_MAX_SIZE)
358 rs_tl_rm_old_stats(tl, curr_time);
359
360 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
361 tl->packet_count[index] = tl->packet_count[index] + 1;
362 tl->total = tl->total + 1;
363
364 if ((index + 1) > tl->queue_count)
365 tl->queue_count = index + 1;
faa29718
RR		 366
367 return tid;
0c11b4de
RR		 368}
369
370/*
371 get the traffic load value for tid
372*/
e227ceac 373static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
0c11b4de
RR		 374{
375 u32 curr_time = jiffies_to_msecs(jiffies);
376 u32 time_diff;
377 s32 index;
e227ceac 378 struct iwl_traffic_load *tl = NULL;
0c11b4de
RR		 379
380 if (tid >= TID_MAX_LOAD_COUNT)
381 return 0;
382
383 tl = &(lq_data->load[tid]);
384
385 curr_time -= curr_time % TID_ROUND_VALUE;
386
387 if (!(tl->queue_count))
388 return 0;
389
390 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
391 index = time_diff / TID_QUEUE_CELL_SPACING;
392
393 /* The history is too long: remove data that is older than */
394 /* TID_MAX_TIME_DIFF */
395 if (index >= TID_QUEUE_MAX_SIZE)
396 rs_tl_rm_old_stats(tl, curr_time);
397
398 return tl->total;
399}
400
c79dd5b5 401static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
e227ceac 402 struct iwl_lq_sta *lq_data, u8 tid,
4b7679a5 403 struct ieee80211_sta *sta)
0c11b4de 404{
ff550cb4 405 if (rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
e1623446 406 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
e174961c 407 sta->addr, tid);
4b7679a5 408 ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
0c11b4de
RR		 409 }
410}
411
c79dd5b5 412static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
e227ceac 413 struct iwl_lq_sta *lq_data,
4b7679a5 414 struct ieee80211_sta *sta)
0c11b4de
RR		 415{
416 if ((tid < TID_MAX_LOAD_COUNT))
417 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
418 else if (tid == IWL_AGG_ALL_TID)
419 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
420 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
421}
422
39e88504 423static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
fde0db31 424{
3ac7f146
TW		 425 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
426 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
427 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
fde0db31
GC		 428}
429
77626355
BC		 430/**
431 * rs_collect_tx_data - Update the success/failure sliding window
432 *
433 * We keep a sliding window of the last 62 packets transmitted
434 * at this rate. window->data contains the bitmask of successful
435 * packets.
436 */
e227ceac 437static int rs_collect_tx_data(struct iwl_rate_scale_data *windows,
99556438
RR		 438 int scale_index, s32 tpt, int retries,
439 int successes)
b481de9c 440{
e227ceac 441 struct iwl_rate_scale_data *window = NULL;
39e88504 442 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
b481de9c
ZY		 443 s32 fail_count;
444
dc2453ae
TW		 445 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
446 return -EINVAL;
b481de9c 447
77626355 448 /* Select data for current tx bit rate */
b481de9c
ZY		 449 window = &(windows[scale_index]);
450
77626355
BC		 451 /*
452 * Keep track of only the latest 62 tx frame attempts in this rate's
453 * history window; anything older isn't really relevant any more.
454 * If we have filled up the sliding window, drop the oldest attempt;
455 * if the oldest attempt (highest bit in bitmap) shows "success",
456 * subtract "1" from the success counter (this is the main reason
457 * we keep these bitmaps!).
458 */
99556438 459 while (retries > 0) {
39e88504
GC		 460 if (window->counter >= IWL_RATE_MAX_WINDOW) {
461
462 /* remove earliest */
463 window->counter = IWL_RATE_MAX_WINDOW - 1;
464
99556438
RR		 465 if (window->data & mask) {
466 window->data &= ~mask;
39e88504 467 window->success_counter--;
99556438 468 }
b481de9c 469 }
b481de9c 470
99556438
RR		 471 /* Increment frames-attempted counter */
472 window->counter++;
473
474 /* Shift bitmap by one frame (throw away oldest history),
475 * OR in "1", and increment "success" if this
476 * frame was successful. */
90d7795e 477 window->data <<= 1;
99556438 478 if (successes > 0) {
39e88504 479 window->success_counter++;
99556438
RR		 480 window->data |= 0x1;
481 successes--;
482 }
77626355 483
99556438 484 retries--;
b481de9c
ZY		 485 }
486
77626355 487 /* Calculate current success ratio, avoid divide-by-0! */
b481de9c
ZY		 488 if (window->counter > 0)
489 window->success_ratio = 128 * (100 * window->success_counter)
490 / window->counter;
491 else
492 window->success_ratio = IWL_INVALID_VALUE;
493
494 fail_count = window->counter - window->success_counter;
495
77626355 496 /* Calculate average throughput, if we have enough history. */
b481de9c
ZY		 497 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
498 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
499 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
500 else
501 window->average_tpt = IWL_INVALID_VALUE;
502
77626355 503 /* Tag this window as having been updated */
b481de9c
ZY		 504 window->stamp = jiffies;
505
dc2453ae 506 return 0;
b481de9c
ZY		 507}
508
77626355
BC		 509/*
510 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
511 */
39e88504 512/* FIXME:RS:remove this function and put the flags statically in the table */
978785a3
TW		 513static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
514 struct iwl_scale_tbl_info *tbl,
515 int index, u8 use_green)
b481de9c 516{
39e88504
GC		 517 u32 rate_n_flags = 0;
518
b481de9c 519 if (is_legacy(tbl->lq_type)) {
1826dcc0 520 rate_n_flags = iwl_rates[index].plcp;
b481de9c 521 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
39e88504 522 rate_n_flags |= RATE_MCS_CCK_MSK;
b481de9c 523
fde0db31
GC		 524 } else if (is_Ht(tbl->lq_type)) {
525 if (index > IWL_LAST_OFDM_RATE) {
978785a3 526 IWL_ERR(priv, "Invalid HT rate index %d\n", index);
b481de9c 527 index = IWL_LAST_OFDM_RATE;
fde0db31 528 }
39e88504 529 rate_n_flags = RATE_MCS_HT_MSK;
fde0db31
GC		 530
531 if (is_siso(tbl->lq_type))
1826dcc0 532 rate_n_flags |= iwl_rates[index].plcp_siso;
fde0db31 533 else if (is_mimo2(tbl->lq_type))
1826dcc0 534 rate_n_flags |= iwl_rates[index].plcp_mimo2;
fde0db31 535 else
1826dcc0 536 rate_n_flags |= iwl_rates[index].plcp_mimo3;
b481de9c 537 } else {
978785a3 538 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
b481de9c
ZY		 539 }
540
39e88504 541 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
fde0db31 542 RATE_MCS_ANT_ABC_MSK);
b481de9c 543
39e88504 544 if (is_Ht(tbl->lq_type)) {
7aafef1c 545 if (tbl->is_ht40) {
39e88504
GC		 546 if (tbl->is_dup)
547 rate_n_flags |= RATE_MCS_DUP_MSK;
548 else
7aafef1c 549 rate_n_flags |= RATE_MCS_HT40_MSK;
39e88504
GC		 550 }
551 if (tbl->is_SGI)
552 rate_n_flags |= RATE_MCS_SGI_MSK;
553
554 if (use_green) {
555 rate_n_flags |= RATE_MCS_GF_MSK;
556 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
557 rate_n_flags &= ~RATE_MCS_SGI_MSK;
978785a3 558 IWL_ERR(priv, "GF was set with SGI:SISO\n");
39e88504
GC		 559 }
560 }
b481de9c 561 }
39e88504 562 return rate_n_flags;
b481de9c
ZY		 563}
564
77626355
BC		 565/*
566 * Interpret uCode API's rate_n_flags format,
567 * fill "search" or "active" tx mode table.
568 */
39e88504 569static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
8318d78a 570 enum ieee80211_band band,
e227ceac 571 struct iwl_scale_tbl_info *tbl,
b481de9c
ZY		 572 int *rate_idx)
573{
39e88504
GC		 574 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
575 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
576 u8 mcs;
b481de9c 577
e7d326ac 578 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
b481de9c 579
fde0db31 580 if (*rate_idx == IWL_RATE_INVALID) {
b481de9c 581 *rate_idx = -1;
dc2453ae 582 return -EINVAL;
b481de9c 583 }
77626355 584 tbl->is_SGI = 0; /* default legacy setup */
7aafef1c 585 tbl->is_ht40 = 0;
b481de9c 586 tbl->is_dup = 0;
fde0db31
GC		 587 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
588 tbl->lq_type = LQ_NONE;
d6e93399 589 tbl->max_search = IWL_MAX_SEARCH;
b481de9c 590
77626355 591 /* legacy rate format */
39e88504 592 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
fde0db31 593 if (num_of_ant == 1) {
8318d78a 594 if (band == IEEE80211_BAND_5GHZ)
b481de9c
ZY		 595 tbl->lq_type = LQ_A;
596 else
597 tbl->lq_type = LQ_G;
b481de9c 598 }
fde0db31 599 /* HT rate format */
b481de9c 600 } else {
39e88504 601 if (rate_n_flags & RATE_MCS_SGI_MSK)
b481de9c
ZY		 602 tbl->is_SGI = 1;
603
7aafef1c 604 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
39e88504 605 (rate_n_flags & RATE_MCS_DUP_MSK))
7aafef1c 606 tbl->is_ht40 = 1;
b481de9c 607
39e88504 608 if (rate_n_flags & RATE_MCS_DUP_MSK)
b481de9c 609 tbl->is_dup = 1;
fde0db31 610
39e88504 611 mcs = rs_extract_rate(rate_n_flags);
fde0db31 612
39e88504
GC		 613 /* SISO */
614 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
fde0db31
GC		 615 if (num_of_ant == 1)
616 tbl->lq_type = LQ_SISO; /*else NONE*/
617 /* MIMO2 */
39e88504 618 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
fde0db31
GC		 619 if (num_of_ant == 2)
620 tbl->lq_type = LQ_MIMO2;
621 /* MIMO3 */
622 } else {
d6e93399
MA		 623 if (num_of_ant == 3) {
624 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
fde0db31 625 tbl->lq_type = LQ_MIMO3;
d6e93399 626 }
fde0db31 627 }
b481de9c
ZY		 628 }
629 return 0;
630}
aade00ce
GC		 631
632/* switch to another antenna/antennas and return 1 */
633/* if no other valid antenna found, return 0 */
634static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
e227ceac 635 struct iwl_scale_tbl_info *tbl)
b481de9c 636{
aade00ce
GC		 637 u8 new_ant_type;
638
639 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
640 return 0;
641
642 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
643 return 0;
644
645 new_ant_type = ant_toggle_lookup[tbl->ant_type];
646
647 while ((new_ant_type != tbl->ant_type) &&
648 !rs_is_valid_ant(valid_ant, new_ant_type))
649 new_ant_type = ant_toggle_lookup[new_ant_type];
650
651 if (new_ant_type == tbl->ant_type)
652 return 0;
653
654 tbl->ant_type = new_ant_type;
655 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
656 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
657 return 1;
b481de9c
ZY		 658}
659
2681b20b
WYG		 660/* in 4965 we don't use greenfield at all */
661static inline u8 rs_use_green(struct iwl_priv *priv,
662 struct ieee80211_conf *conf)
b481de9c 663{
2681b20b
WYG		 664 u8 is_green;
665
666 if ((priv->hw_rev & CSR_HW_REV_TYPE_MSK) == CSR_HW_REV_TYPE_4965)
667 is_green = 0;
668 else
669 is_green = (conf_is_ht(conf) &&
670 priv->current_ht_config.is_green_field &&
671 !priv->current_ht_config.non_GF_STA_present);
672 return is_green;
b481de9c
ZY		 673}
674
675/**
676 * rs_get_supported_rates - get the available rates
677 *
678 * if management frame or broadcast frame only return
679 * basic available rates.
680 *
681 */
e227ceac
TW		 682static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
683 struct ieee80211_hdr *hdr,
684 enum iwl_table_type rate_type)
b481de9c 685{
eecd6e57
GC		 686 if (hdr && is_multicast_ether_addr(hdr->addr1) &&
687 lq_sta->active_rate_basic)
688 return lq_sta->active_rate_basic;
689
690 if (is_legacy(rate_type)) {
691 return lq_sta->active_legacy_rate;
692 } else {
b481de9c 693 if (is_siso(rate_type))
eecd6e57 694 return lq_sta->active_siso_rate;
fde0db31 695 else if (is_mimo2(rate_type))
eecd6e57 696 return lq_sta->active_mimo2_rate;
b481de9c 697 else
eecd6e57 698 return lq_sta->active_mimo3_rate;
c33104f0 699 }
b481de9c
ZY		 700}
701
bf403db8
EK		 702static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
703 int rate_type)
b481de9c
ZY		 704{
705 u8 high = IWL_RATE_INVALID;
706 u8 low = IWL_RATE_INVALID;
707
01ebd063 708 /* 802.11A or ht walks to the next literal adjacent rate in
b481de9c
ZY		 709 * the rate table */
710 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
711 int i;
712 u32 mask;
713
714 /* Find the previous rate that is in the rate mask */
715 i = index - 1;
716 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
717 if (rate_mask & mask) {
718 low = i;
719 break;
720 }
721 }
722
723 /* Find the next rate that is in the rate mask */
724 i = index + 1;
725 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
726 if (rate_mask & mask) {
727 high = i;
728 break;
729 }
730 }
731
732 return (high << 8) | low;
733 }
734
735 low = index;
736 while (low != IWL_RATE_INVALID) {
1826dcc0 737 low = iwl_rates[low].prev_rs;
b481de9c
ZY		 738 if (low == IWL_RATE_INVALID)
739 break;
740 if (rate_mask & (1 << low))
741 break;
e1623446 742 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
b481de9c
ZY		 743 }
744
745 high = index;
746 while (high != IWL_RATE_INVALID) {
1826dcc0 747 high = iwl_rates[high].next_rs;
b481de9c
ZY		 748 if (high == IWL_RATE_INVALID)
749 break;
750 if (rate_mask & (1 << high))
751 break;
e1623446 752 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
b481de9c
ZY		 753 }
754
755 return (high << 8) | low;
756}
757
e227ceac
TW		 758static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
759 struct iwl_scale_tbl_info *tbl,
760 u8 scale_index, u8 ht_possible)
b481de9c 761{
b481de9c
ZY		 762 s32 low;
763 u16 rate_mask;
764 u16 high_low;
765 u8 switch_to_legacy = 0;
c33104f0 766 u8 is_green = lq_sta->is_green;
b481de9c
ZY		 767
768 /* check if we need to switch from HT to legacy rates.
769 * assumption is that mandatory rates (1Mbps or 6Mbps)
770 * are always supported (spec demand) */
771 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
772 switch_to_legacy = 1;
773 scale_index = rs_ht_to_legacy[scale_index];
8318d78a 774 if (lq_sta->band == IEEE80211_BAND_5GHZ)
b481de9c
ZY		 775 tbl->lq_type = LQ_A;
776 else
777 tbl->lq_type = LQ_G;
778
69fdb309 779 if (num_of_ant(tbl->ant_type) > 1)
fde0db31 780 tbl->ant_type = ANT_A;/*FIXME:RS*/
b481de9c 781
7aafef1c 782 tbl->is_ht40 = 0;
b481de9c 783 tbl->is_SGI = 0;
d6e93399 784 tbl->max_search = IWL_MAX_SEARCH;
b481de9c
ZY		 785 }
786
eecd6e57 787 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
b481de9c 788
77626355 789 /* Mask with station rate restriction */
b481de9c 790 if (is_legacy(tbl->lq_type)) {
77626355 791 /* supp_rates has no CCK bits in A mode */
8318d78a 792 if (lq_sta->band == IEEE80211_BAND_5GHZ)
b481de9c 793 rate_mask = (u16)(rate_mask &
c33104f0 794 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
b481de9c 795 else
c33104f0 796 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
b481de9c
ZY		 797 }
798
77626355 799 /* If we switched from HT to legacy, check current rate */
dc2453ae 800 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
39e88504
GC		 801 low = scale_index;
802 goto out;
b481de9c
ZY		 803 }
804
bf403db8
EK		 805 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
806 tbl->lq_type);
b481de9c
ZY		 807 low = high_low & 0xff;
808
39e88504
GC		 809 if (low == IWL_RATE_INVALID)
810 low = scale_index;
811
812out:
978785a3 813 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
b481de9c
ZY		 814}
815
77626355
BC		 816/*
817 * mac80211 sends us Tx status
818 */
4b7679a5
JB		 819static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
820 struct ieee80211_sta *sta, void *priv_sta,
e039fa4a 821 struct sk_buff *skb)
b481de9c
ZY		 822{
823 int status;
824 u8 retries;
825 int rs_index, index = 0;
417f114b 826 struct iwl_lq_sta *lq_sta = priv_sta;
66c73db7 827 struct iwl_link_quality_cmd *table;
b481de9c 828 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
4b7679a5
JB		 829 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
830 struct ieee80211_hw *hw = priv->hw;
e039fa4a 831 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
e227ceac
TW		 832 struct iwl_rate_scale_data *window = NULL;
833 struct iwl_rate_scale_data *search_win = NULL;
39e88504 834 u32 tx_rate;
e227ceac
TW		 835 struct iwl_scale_tbl_info tbl_type;
836 struct iwl_scale_tbl_info *curr_tbl, *search_tbl;
b481de9c 837 u8 active_index = 0;
b481de9c
ZY		 838 s32 tpt = 0;
839
e1623446 840 IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
b481de9c 841
417f114b 842 if (!ieee80211_is_data(hdr->frame_control) ||
514d65c1 843 info->flags & IEEE80211_TX_CTL_NO_ACK)
b481de9c
ZY		 844 return;
845
99556438 846 /* This packet was aggregated but doesn't carry rate scale info */
e039fa4a
JB		 847 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
848 !(info->flags & IEEE80211_TX_STAT_AMPDU))
99556438
RR		 849 return;
850
8fe72311
WYG		 851 if (info->flags & IEEE80211_TX_STAT_AMPDU)
852 retries = 0;
853 else
854 retries = info->status.rates[0].count - 1;
b481de9c
ZY		 855
856 if (retries > 15)
857 retries = 15;
858
05c914fe 859 if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
c33104f0 860 !lq_sta->ibss_sta_added)
f4d6082d 861 goto out;
b481de9c 862
c33104f0
TW		 863 table = &lq_sta->lq;
864 active_index = lq_sta->active_tbl;
b481de9c 865
c33104f0
TW		 866 curr_tbl = &(lq_sta->lq_info[active_index]);
867 search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
e227ceac
TW		 868 window = (struct iwl_rate_scale_data *)&(curr_tbl->win[0]);
869 search_win = (struct iwl_rate_scale_data *)&(search_tbl->win[0]);
b481de9c 870
77626355
BC		 871 /*
872 * Ignore this Tx frame response if its initial rate doesn't match
873 * that of latest Link Quality command. There may be stragglers
874 * from a previous Link Quality command, but we're no longer interested
875 * in those; they're either from the "active" mode while we're trying
876 * to check "search" mode, or a prior "search" mode after we've moved
877 * to a new "search" mode (which might become the new "active" mode).
878 */
39e88504
GC		 879 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
880 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
4c424e4c
RR		 881 if (priv->band == IEEE80211_BAND_5GHZ)
882 rs_index -= IWL_FIRST_OFDM_RATE;
883
e6a9854b
JB		 884 if ((info->status.rates[0].idx < 0) ||
885 (tbl_type.is_SGI != !!(info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)) ||
7aafef1c 886 (tbl_type.is_ht40 != !!(info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
e6a9854b
JB		 887 (tbl_type.is_dup != !!(info->status.rates[0].flags & IEEE80211_TX_RC_DUP_DATA)) ||
888 (tbl_type.ant_type != info->antenna_sel_tx) ||
889 (!!(tx_rate & RATE_MCS_HT_MSK) != !!(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) ||
890 (!!(tx_rate & RATE_MCS_GF_MSK) != !!(info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
4c424e4c 891 (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
e6a9854b 892 hw->wiphy->bands[info->band]->bitrates[info->status.rates[0].idx].bitrate)) {
e1623446 893 IWL_DEBUG_RATE(priv, "initial rate does not match 0x%x\n", tx_rate);
d5e49036
MA		 894 /* the last LQ command could failed so the LQ in ucode not
895 * the same in driver sync up
896 */
7d049e5a
AM		 897 lq_sta->missed_rate_counter++;
898 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
899 lq_sta->missed_rate_counter = 0;
900 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
901 }
f4d6082d 902 goto out;
b481de9c
ZY		 903 }
904
7d049e5a 905 lq_sta->missed_rate_counter = 0;
77626355 906 /* Update frame history window with "failure" for each Tx retry. */
b481de9c 907 while (retries) {
77626355
BC		 908 /* Look up the rate and other info used for each tx attempt.
909 * Each tx attempt steps one entry deeper in the rate table. */
39e88504
GC		 910 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
911 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
b481de9c
ZY		 912 &tbl_type, &rs_index);
913
77626355
BC		 914 /* If type matches "search" table,
915 * add failure to "search" history */
b481de9c 916 if ((tbl_type.lq_type == search_tbl->lq_type) &&
fde0db31 917 (tbl_type.ant_type == search_tbl->ant_type) &&
b481de9c
ZY		 918 (tbl_type.is_SGI == search_tbl->is_SGI)) {
919 if (search_tbl->expected_tpt)
920 tpt = search_tbl->expected_tpt[rs_index];
921 else
922 tpt = 0;
99556438 923 rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
77626355
BC		 924
925 /* Else if type matches "current/active" table,
926 * add failure to "current/active" history */
b481de9c 927 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
fde0db31 928 (tbl_type.ant_type == curr_tbl->ant_type) &&
b481de9c
ZY		 929 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
930 if (curr_tbl->expected_tpt)
931 tpt = curr_tbl->expected_tpt[rs_index];
932 else
933 tpt = 0;
99556438 934 rs_collect_tx_data(window, rs_index, tpt, 1, 0);
b481de9c 935 }
77626355
BC		 936
937 /* If not searching for a new mode, increment failed counter
938 * ... this helps determine when to start searching again */
c33104f0
TW		 939 if (lq_sta->stay_in_tbl)
940 lq_sta->total_failed++;
b481de9c
ZY		 941 --retries;
942 index++;
943
944 }
945
77626355
BC		 946 /*
947 * Find (by rate) the history window to update with final Tx attempt;
948 * if Tx was successful first try, use original rate,
949 * else look up the rate that was, finally, successful.
950 */
39e88504 951 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
12b96817 952 lq_sta->last_rate_n_flags = tx_rate;
39e88504 953 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
b481de9c 954
77626355 955 /* Update frame history window with "success" if Tx got ACKed ... */
e039fa4a 956 status = !!(info->flags & IEEE80211_TX_STAT_ACK);
b481de9c 957
77626355
BC		 958 /* If type matches "search" table,
959 * add final tx status to "search" history */
b481de9c 960 if ((tbl_type.lq_type == search_tbl->lq_type) &&
fde0db31 961 (tbl_type.ant_type == search_tbl->ant_type) &&
b481de9c
ZY		 962 (tbl_type.is_SGI == search_tbl->is_SGI)) {
963 if (search_tbl->expected_tpt)
964 tpt = search_tbl->expected_tpt[rs_index];
965 else
966 tpt = 0;
df36c044 967 if (info->flags & IEEE80211_TX_STAT_AMPDU)
99556438 968 rs_collect_tx_data(search_win, rs_index, tpt,
e039fa4a
JB		 969 info->status.ampdu_ack_len,
970 info->status.ampdu_ack_map);
99556438
RR		 971 else
972 rs_collect_tx_data(search_win, rs_index, tpt,
973 1, status);
77626355
BC		 974 /* Else if type matches "current/active" table,
975 * add final tx status to "current/active" history */
b481de9c 976 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
fde0db31 977 (tbl_type.ant_type == curr_tbl->ant_type) &&
b481de9c
ZY		 978 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
979 if (curr_tbl->expected_tpt)
980 tpt = curr_tbl->expected_tpt[rs_index];
981 else
982 tpt = 0;
df36c044 983 if (info->flags & IEEE80211_TX_STAT_AMPDU)
99556438 984 rs_collect_tx_data(window, rs_index, tpt,
e039fa4a
JB		 985 info->status.ampdu_ack_len,
986 info->status.ampdu_ack_map);
99556438
RR		 987 else
988 rs_collect_tx_data(window, rs_index, tpt,
989 1, status);
b481de9c
ZY		 990 }
991
77626355
BC		 992 /* If not searching for new mode, increment success/failed counter
993 * ... these help determine when to start searching again */
c33104f0 994 if (lq_sta->stay_in_tbl) {
df36c044 995 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
e039fa4a 996 lq_sta->total_success += info->status.ampdu_ack_map;
99556438 997 lq_sta->total_failed +=
e039fa4a 998 (info->status.ampdu_ack_len - info->status.ampdu_ack_map);
99556438
RR		 999 } else {
1000 if (status)
1001 lq_sta->total_success++;
1002 else
1003 lq_sta->total_failed++;
1004 }
b481de9c
ZY		 1005 }
1006
77626355 1007 /* See if there's a better rate or modulation mode to try. */
c338ba3c 1008 if (sta && sta->supp_rates[sband->band])
514d65c1 1009 rs_rate_scale_perform(priv, skb, sta, lq_sta);
f4d6082d 1010out:
b481de9c
ZY		 1011 return;
1012}
1013
77626355
BC		 1014/*
1015 * Begin a period of staying with a selected modulation mode.
1016 * Set "stay_in_tbl" flag to prevent any mode switches.
1017 * Set frame tx success limits according to legacy vs. high-throughput,
1018 * and reset overall (spanning all rates) tx success history statistics.
1019 * These control how long we stay using same modulation mode before
1020 * searching for a new mode.
1021 */
bf403db8 1022static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
e227ceac 1023 struct iwl_lq_sta *lq_sta)
b481de9c 1024{
e1623446 1025 IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
c33104f0 1026 lq_sta->stay_in_tbl = 1; /* only place this gets set */
b481de9c 1027 if (is_legacy) {
c33104f0
TW		 1028 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1029 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1030 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
b481de9c 1031 } else {
c33104f0
TW		 1032 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1033 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1034 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
b481de9c 1035 }
c33104f0
TW		 1036 lq_sta->table_count = 0;
1037 lq_sta->total_failed = 0;
1038 lq_sta->total_success = 0;
447fee70 1039 lq_sta->flush_timer = jiffies;
d6e93399 1040 lq_sta->action_counter = 0;
b481de9c
ZY		 1041}
1042
77626355
BC		 1043/*
1044 * Find correct throughput table for given mode of modulation
1045 */
e227ceac
TW		 1046static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1047 struct iwl_scale_tbl_info *tbl)
b481de9c
ZY		 1048{
1049 if (is_legacy(tbl->lq_type)) {
1050 if (!is_a_band(tbl->lq_type))
1051 tbl->expected_tpt = expected_tpt_G;
1052 else
1053 tbl->expected_tpt = expected_tpt_A;
1054 } else if (is_siso(tbl->lq_type)) {
7aafef1c 1055 if (tbl->is_ht40 && !lq_sta->is_dup)
b481de9c
ZY		 1056 if (tbl->is_SGI)
1057 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
1058 else
1059 tbl->expected_tpt = expected_tpt_siso40MHz;
1060 else if (tbl->is_SGI)
1061 tbl->expected_tpt = expected_tpt_siso20MHzSGI;
1062 else
1063 tbl->expected_tpt = expected_tpt_siso20MHz;
584a0f00 1064 } else if (is_mimo2(tbl->lq_type)) {
7aafef1c 1065 if (tbl->is_ht40 && !lq_sta->is_dup)
584a0f00
WYG		 1066 if (tbl->is_SGI)
1067 tbl->expected_tpt = expected_tpt_mimo2_40MHzSGI;
1068 else
1069 tbl->expected_tpt = expected_tpt_mimo2_40MHz;
1070 else if (tbl->is_SGI)
1071 tbl->expected_tpt = expected_tpt_mimo2_20MHzSGI;
1072 else
1073 tbl->expected_tpt = expected_tpt_mimo2_20MHz;
1074 } else if (is_mimo3(tbl->lq_type)) {
7aafef1c 1075 if (tbl->is_ht40 && !lq_sta->is_dup)
b481de9c 1076 if (tbl->is_SGI)
584a0f00 1077 tbl->expected_tpt = expected_tpt_mimo3_40MHzSGI;
b481de9c 1078 else
584a0f00 1079 tbl->expected_tpt = expected_tpt_mimo3_40MHz;
b481de9c 1080 else if (tbl->is_SGI)
584a0f00 1081 tbl->expected_tpt = expected_tpt_mimo3_20MHzSGI;
b481de9c 1082 else
584a0f00 1083 tbl->expected_tpt = expected_tpt_mimo3_20MHz;
b481de9c
ZY		 1084 } else
1085 tbl->expected_tpt = expected_tpt_G;
1086}
1087
77626355
BC		 1088/*
1089 * Find starting rate for new "search" high-throughput mode of modulation.
1090 * Goal is to find lowest expected rate (under perfect conditions) that is
1091 * above the current measured throughput of "active" mode, to give new mode
1092 * a fair chance to prove itself without too many challenges.
1093 *
1094 * This gets called when transitioning to more aggressive modulation
1095 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1096 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1097 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1098 * bit rate will typically need to increase, but not if performance was bad.
1099 */
c79dd5b5 1100static s32 rs_get_best_rate(struct iwl_priv *priv,
e227ceac
TW		 1101 struct iwl_lq_sta *lq_sta,
1102 struct iwl_scale_tbl_info *tbl, /* "search" */
f935a6da 1103 u16 rate_mask, s8 index)
b481de9c 1104{
77626355 1105 /* "active" values */
e227ceac 1106 struct iwl_scale_tbl_info *active_tbl =
c33104f0 1107 &(lq_sta->lq_info[lq_sta->active_tbl]);
b481de9c 1108 s32 active_sr = active_tbl->win[index].success_ratio;
b481de9c 1109 s32 active_tpt = active_tbl->expected_tpt[index];
77626355
BC		 1110
1111 /* expected "search" throughput */
1112 s32 *tpt_tbl = tbl->expected_tpt;
1113
1114 s32 new_rate, high, low, start_hi;
b481de9c 1115 u16 high_low;
f935a6da 1116 s8 rate = index;
b481de9c
ZY		 1117
1118 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1119
1120 for (; ;) {
bf403db8
EK		 1121 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1122 tbl->lq_type);
b481de9c
ZY		 1123
1124 low = high_low & 0xff;
1125 high = (high_low >> 8) & 0xff;
1126
77626355
BC		 1127 /*
1128 * Lower the "search" bit rate, to give new "search" mode
1129 * approximately the same throughput as "active" if:
1130 *
1131 * 1) "Active" mode has been working modestly well (but not
1132 * great), and expected "search" throughput (under perfect
1133 * conditions) at candidate rate is above the actual
1134 * measured "active" throughput (but less than expected
1135 * "active" throughput under perfect conditions).
1136 * OR
1137 * 2) "Active" mode has been working perfectly or very well
1138 * and expected "search" throughput (under perfect
1139 * conditions) at candidate rate is above expected
1140 * "active" throughput (under perfect conditions).
1141 */
c33104f0 1142 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
b481de9c
ZY		 1143 ((active_sr > IWL_RATE_DECREASE_TH) &&
1144 (active_sr <= IWL_RATE_HIGH_TH) &&
1145 (tpt_tbl[rate] <= active_tpt))) ||
1146 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1147 (tpt_tbl[rate] > active_tpt))) {
1148
77626355
BC		 1149 /* (2nd or later pass)
1150 * If we've already tried to raise the rate, and are
1151 * now trying to lower it, use the higher rate. */
b481de9c
ZY		 1152 if (start_hi != IWL_RATE_INVALID) {
1153 new_rate = start_hi;
1154 break;
1155 }
77626355 1156
b481de9c 1157 new_rate = rate;
77626355
BC		 1158
1159 /* Loop again with lower rate */
b481de9c
ZY		 1160 if (low != IWL_RATE_INVALID)
1161 rate = low;
77626355
BC		 1162
1163 /* Lower rate not available, use the original */
b481de9c
ZY		 1164 else
1165 break;
77626355
BC		 1166
1167 /* Else try to raise the "search" rate to match "active" */
b481de9c 1168 } else {
77626355
BC		 1169 /* (2nd or later pass)
1170 * If we've already tried to lower the rate, and are
1171 * now trying to raise it, use the lower rate. */
b481de9c
ZY		 1172 if (new_rate != IWL_RATE_INVALID)
1173 break;
77626355
BC		 1174
1175 /* Loop again with higher rate */
b481de9c
ZY		 1176 else if (high != IWL_RATE_INVALID) {
1177 start_hi = high;
1178 rate = high;
77626355
BC		 1179
1180 /* Higher rate not available, use the original */
b481de9c 1181 } else {
90d7795e 1182 new_rate = rate;
b481de9c
ZY		 1183 break;
1184 }
1185 }
1186 }
1187
1188 return new_rate;
1189}
b481de9c 1190
77626355 1191/*
584a0f00 1192 * Set up search table for MIMO2
77626355 1193 */
fde0db31 1194static int rs_switch_to_mimo2(struct iwl_priv *priv,
e227ceac 1195 struct iwl_lq_sta *lq_sta,
270243a5 1196 struct ieee80211_conf *conf,
4b7679a5 1197 struct ieee80211_sta *sta,
e227ceac 1198 struct iwl_scale_tbl_info *tbl, int index)
b481de9c 1199{
b481de9c
ZY		 1200 u16 rate_mask;
1201 s32 rate;
c33104f0 1202 s8 is_green = lq_sta->is_green;
b481de9c 1203
de27e64e 1204 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
b481de9c
ZY		 1205 return -1;
1206
d9fe60de 1207 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
00c5ae2f 1208 == WLAN_HT_CAP_SM_PS_STATIC)
b481de9c
ZY		 1209 return -1;
1210
77626355 1211 /* Need both Tx chains/antennas to support MIMO */
aade00ce 1212 if (priv->hw_params.tx_chains_num < 2)
b481de9c
ZY		 1213 return -1;
1214
e1623446 1215 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
39e88504
GC		 1216
1217 tbl->lq_type = LQ_MIMO2;
c33104f0 1218 tbl->is_dup = lq_sta->is_dup;
b481de9c 1219 tbl->action = 0;
d6e93399 1220 tbl->max_search = IWL_MAX_SEARCH;
39e88504
GC		 1221 rate_mask = lq_sta->active_mimo2_rate;
1222
7aafef1c
WYG		 1223 if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1224 tbl->is_ht40 = 1;
b481de9c 1225 else
7aafef1c 1226 tbl->is_ht40 = 0;
b481de9c 1227
39e88504 1228 /* FIXME: - don't toggle SGI here
7aafef1c 1229 if (tbl->is_ht40) {
270243a5 1230 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
b481de9c
ZY		 1231 tbl->is_SGI = 1;
1232 else
1233 tbl->is_SGI = 0;
270243a5 1234 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
b481de9c
ZY		 1235 tbl->is_SGI = 1;
1236 else
1237 tbl->is_SGI = 0;
39e88504 1238 */
b481de9c 1239
eecd6e57 1240 rs_set_expected_tpt_table(lq_sta, tbl);
b481de9c 1241
f935a6da 1242 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
b481de9c 1243
e1623446 1244 IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
584a0f00
WYG		 1245 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1246 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1247 rate, rate_mask);
1248 return -1;
1249 }
1250 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1251
1252 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1253 tbl->current_rate, is_green);
1254 return 0;
1255}
1256
1257/*
1258 * Set up search table for MIMO3
1259 */
1260static int rs_switch_to_mimo3(struct iwl_priv *priv,
1261 struct iwl_lq_sta *lq_sta,
1262 struct ieee80211_conf *conf,
1263 struct ieee80211_sta *sta,
1264 struct iwl_scale_tbl_info *tbl, int index)
1265{
1266 u16 rate_mask;
1267 s32 rate;
1268 s8 is_green = lq_sta->is_green;
1269
1270 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1271 return -1;
1272
1273 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1274 == WLAN_HT_CAP_SM_PS_STATIC)
1275 return -1;
1276
1277 /* Need both Tx chains/antennas to support MIMO */
1278 if (priv->hw_params.tx_chains_num < 3)
1279 return -1;
1280
1281 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1282
1283 tbl->lq_type = LQ_MIMO3;
1284 tbl->is_dup = lq_sta->is_dup;
1285 tbl->action = 0;
d6e93399 1286 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
584a0f00
WYG		 1287 rate_mask = lq_sta->active_mimo3_rate;
1288
7aafef1c
WYG		 1289 if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1290 tbl->is_ht40 = 1;
584a0f00 1291 else
7aafef1c 1292 tbl->is_ht40 = 0;
39e88504 1293
584a0f00 1294 /* FIXME: - don't toggle SGI here
7aafef1c 1295 if (tbl->is_ht40) {
584a0f00
WYG		 1296 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1297 tbl->is_SGI = 1;
1298 else
1299 tbl->is_SGI = 0;
1300 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1301 tbl->is_SGI = 1;
1302 else
1303 tbl->is_SGI = 0;
1304 */
1305
1306 rs_set_expected_tpt_table(lq_sta, tbl);
1307
1308 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1309
1310 IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1311 rate, rate_mask);
39e88504 1312 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
e1623446 1313 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
39e88504 1314 rate, rate_mask);
b481de9c 1315 return -1;
39e88504 1316 }
978785a3 1317 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
b481de9c 1318
e1623446 1319 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
39e88504 1320 tbl->current_rate, is_green);
dc2453ae 1321 return 0;
fde0db31 1322}
b481de9c 1323
77626355
BC		 1324/*
1325 * Set up search table for SISO
1326 */
c79dd5b5 1327static int rs_switch_to_siso(struct iwl_priv *priv,
e227ceac 1328 struct iwl_lq_sta *lq_sta,
270243a5 1329 struct ieee80211_conf *conf,
4b7679a5 1330 struct ieee80211_sta *sta,
e227ceac 1331 struct iwl_scale_tbl_info *tbl, int index)
b481de9c 1332{
b481de9c 1333 u16 rate_mask;
c33104f0 1334 u8 is_green = lq_sta->is_green;
b481de9c
ZY		 1335 s32 rate;
1336
de27e64e 1337 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
b481de9c
ZY		 1338 return -1;
1339
e1623446 1340 IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
39e88504 1341
c33104f0 1342 tbl->is_dup = lq_sta->is_dup;
b481de9c
ZY		 1343 tbl->lq_type = LQ_SISO;
1344 tbl->action = 0;
d6e93399 1345 tbl->max_search = IWL_MAX_SEARCH;
39e88504 1346 rate_mask = lq_sta->active_siso_rate;
b481de9c 1347
7aafef1c
WYG		 1348 if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1349 tbl->is_ht40 = 1;
b481de9c 1350 else
7aafef1c 1351 tbl->is_ht40 = 0;
b481de9c 1352
39e88504 1353 /* FIXME: - don't toggle SGI here
7aafef1c 1354 if (tbl->is_ht40) {
270243a5 1355 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
b481de9c
ZY		 1356 tbl->is_SGI = 1;
1357 else
1358 tbl->is_SGI = 0;
270243a5 1359 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
b481de9c
ZY		 1360 tbl->is_SGI = 1;
1361 else
1362 tbl->is_SGI = 0;
39e88504 1363 */
b481de9c
ZY		 1364
1365 if (is_green)
39e88504 1366 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
b481de9c 1367
eecd6e57 1368 rs_set_expected_tpt_table(lq_sta, tbl);
f935a6da 1369 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
b481de9c 1370
e1623446 1371 IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
b481de9c 1372 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
e1623446 1373 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
b481de9c
ZY		 1374 rate, rate_mask);
1375 return -1;
1376 }
978785a3 1377 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
e1623446 1378 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
39e88504 1379 tbl->current_rate, is_green);
403ab56b 1380 return 0;
b481de9c
ZY		 1381}
1382
77626355
BC		 1383/*
1384 * Try to switch to new modulation mode from legacy
1385 */
c79dd5b5 1386static int rs_move_legacy_other(struct iwl_priv *priv,
e227ceac 1387 struct iwl_lq_sta *lq_sta,
270243a5 1388 struct ieee80211_conf *conf,
4b7679a5 1389 struct ieee80211_sta *sta,
b481de9c
ZY		 1390 int index)
1391{
e227ceac
TW		 1392 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1393 struct iwl_scale_tbl_info *search_tbl =
1394 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1395 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1396 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1397 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
b481de9c 1398 u8 start_action = tbl->action;
fde0db31 1399 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
3110bef7 1400 u8 tx_chains_num = priv->hw_params.tx_chains_num;
fde0db31 1401 int ret = 0;
d6e93399 1402 u8 update_search_tbl_counter = 0;
b481de9c 1403
46f9381a
WYG		 1404 if (!iwl_ht_enabled(priv))
1405 /* stay in Legacy */
1406 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
3ad3b92a 1407 else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
46f9381a
WYG		 1408 tbl->action > IWL_LEGACY_SWITCH_SISO)
1409 tbl->action = IWL_LEGACY_SWITCH_SISO;
b481de9c 1410 for (; ;) {
d6e93399 1411 lq_sta->action_counter++;
b481de9c 1412 switch (tbl->action) {
3110bef7
GC		 1413 case IWL_LEGACY_SWITCH_ANTENNA1:
1414 case IWL_LEGACY_SWITCH_ANTENNA2:
e1623446 1415 IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
b481de9c 1416
3110bef7
GC		 1417 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1418 tx_chains_num <= 1) ||
1419 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1420 tx_chains_num <= 2))
1421 break;
1422
77626355 1423 /* Don't change antenna if success has been great */
b481de9c
ZY		 1424 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1425 break;
77626355 1426
77626355 1427 /* Set up search table to try other antenna */
b481de9c
ZY		 1428 memcpy(search_tbl, tbl, sz);
1429
aade00ce
GC		 1430 if (rs_toggle_antenna(valid_tx_ant,
1431 &search_tbl->current_rate, search_tbl)) {
d6e93399 1432 update_search_tbl_counter = 1;
3110bef7 1433 rs_set_expected_tpt_table(lq_sta, search_tbl);
aade00ce
GC		 1434 goto out;
1435 }
a5e8b505 1436 break;
b481de9c 1437 case IWL_LEGACY_SWITCH_SISO:
e1623446 1438 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
77626355
BC		 1439
1440 /* Set up search table to try SISO */
b481de9c 1441 memcpy(search_tbl, tbl, sz);
b481de9c 1442 search_tbl->is_SGI = 0;
c33104f0 1443 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
270243a5 1444 search_tbl, index);
dc2453ae 1445 if (!ret) {
c33104f0 1446 lq_sta->action_counter = 0;
b481de9c 1447 goto out;
dc2453ae 1448 }
b481de9c
ZY		 1449
1450 break;
3110bef7
GC		 1451 case IWL_LEGACY_SWITCH_MIMO2_AB:
1452 case IWL_LEGACY_SWITCH_MIMO2_AC:
1453 case IWL_LEGACY_SWITCH_MIMO2_BC:
e1623446 1454 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
77626355
BC		 1455
1456 /* Set up search table to try MIMO */
b481de9c 1457 memcpy(search_tbl, tbl, sz);
b481de9c 1458 search_tbl->is_SGI = 0;
3110bef7
GC		 1459
1460 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1461 search_tbl->ant_type = ANT_AB;
1462 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1463 search_tbl->ant_type = ANT_AC;
1464 else
1465 search_tbl->ant_type = ANT_BC;
1466
1467 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1468 break;
1469
fde0db31 1470 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
270243a5 1471 search_tbl, index);
dc2453ae 1472 if (!ret) {
c33104f0 1473 lq_sta->action_counter = 0;
b481de9c 1474 goto out;
dc2453ae 1475 }
b481de9c 1476 break;
584a0f00
WYG		 1477
1478 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1479 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1480
1481 /* Set up search table to try MIMO3 */
1482 memcpy(search_tbl, tbl, sz);
1483 search_tbl->is_SGI = 0;
1484
1485 search_tbl->ant_type = ANT_ABC;
1486
1487 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1488 break;
1489
1490 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1491 search_tbl, index);
1492 if (!ret) {
1493 lq_sta->action_counter = 0;
1494 goto out;
1495 }
1496 break;
b481de9c
ZY		 1497 }
1498 tbl->action++;
584a0f00 1499 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
3110bef7 1500 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
b481de9c
ZY		 1501
1502 if (tbl->action == start_action)
1503 break;
1504
1505 }
3110bef7 1506 search_tbl->lq_type = LQ_NONE;
b481de9c
ZY		 1507 return 0;
1508
3110bef7
GC		 1509out:
1510 lq_sta->search_better_tbl = 1;
b481de9c 1511 tbl->action++;
584a0f00 1512 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
3110bef7 1513 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
d6e93399
MA		 1514 if (update_search_tbl_counter)
1515 search_tbl->action = tbl->action;
b481de9c
ZY		 1516 return 0;
1517
1518}
1519
77626355
BC		 1520/*
1521 * Try to switch to new modulation mode from SISO
1522 */
c79dd5b5 1523static int rs_move_siso_to_other(struct iwl_priv *priv,
e227ceac 1524 struct iwl_lq_sta *lq_sta,
270243a5 1525 struct ieee80211_conf *conf,
4b7679a5 1526 struct ieee80211_sta *sta, int index)
b481de9c 1527{
c33104f0 1528 u8 is_green = lq_sta->is_green;
e227ceac
TW		 1529 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1530 struct iwl_scale_tbl_info *search_tbl =
1531 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1532 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1533 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1534 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
b481de9c 1535 u8 start_action = tbl->action;
fde0db31 1536 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
3110bef7 1537 u8 tx_chains_num = priv->hw_params.tx_chains_num;
d6e93399 1538 u8 update_search_tbl_counter = 0;
fde0db31 1539 int ret;
b481de9c 1540
3ad3b92a 1541 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
46f9381a
WYG		 1542 tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1543 /* stay in SISO */
1544 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1545 }
b481de9c 1546 for (;;) {
c33104f0 1547 lq_sta->action_counter++;
b481de9c 1548 switch (tbl->action) {
3110bef7
GC		 1549 case IWL_SISO_SWITCH_ANTENNA1:
1550 case IWL_SISO_SWITCH_ANTENNA2:
e1623446 1551 IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
3110bef7
GC		 1552
1553 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1554 tx_chains_num <= 1) ||
1555 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1556 tx_chains_num <= 2))
1557 break;
1558
b481de9c
ZY		 1559 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1560 break;
b481de9c
ZY		 1561
1562 memcpy(search_tbl, tbl, sz);
aade00ce 1563 if (rs_toggle_antenna(valid_tx_ant,
d6e93399
MA		 1564 &search_tbl->current_rate, search_tbl)) {
1565 update_search_tbl_counter = 1;
aade00ce 1566 goto out;
d6e93399 1567 }
a5e8b505 1568 break;
3110bef7
GC		 1569 case IWL_SISO_SWITCH_MIMO2_AB:
1570 case IWL_SISO_SWITCH_MIMO2_AC:
1571 case IWL_SISO_SWITCH_MIMO2_BC:
e1623446 1572 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
b481de9c 1573 memcpy(search_tbl, tbl, sz);
b481de9c 1574 search_tbl->is_SGI = 0;
3110bef7
GC		 1575
1576 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1577 search_tbl->ant_type = ANT_AB;
1578 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1579 search_tbl->ant_type = ANT_AC;
1580 else
1581 search_tbl->ant_type = ANT_BC;
1582
1583 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1584 break;
1585
fde0db31 1586 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
270243a5 1587 search_tbl, index);
3110bef7 1588 if (!ret)
b481de9c
ZY		 1589 goto out;
1590 break;
1591 case IWL_SISO_SWITCH_GI:
7aafef1c 1592 if (!tbl->is_ht40 &&
a9841013
EG		 1593 !(priv->current_ht_config.sgf &
1594 HT_SHORT_GI_20MHZ))
1595 break;
7aafef1c 1596 if (tbl->is_ht40 &&
a9841013
EG		 1597 !(priv->current_ht_config.sgf &
1598 HT_SHORT_GI_40MHZ))
1599 break;
1600
e1623446 1601 IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
0c11b4de 1602
b481de9c 1603 memcpy(search_tbl, tbl, sz);
39e88504
GC		 1604 if (is_green) {
1605 if (!tbl->is_SGI)
1606 break;
1607 else
15b1687c
WT		 1608 IWL_ERR(priv,
1609 "SGI was set in GF+SISO\n");
b481de9c 1610 }
39e88504 1611 search_tbl->is_SGI = !tbl->is_SGI;
eecd6e57 1612 rs_set_expected_tpt_table(lq_sta, search_tbl);
39e88504
GC		 1613 if (tbl->is_SGI) {
1614 s32 tpt = lq_sta->last_tpt / 100;
1615 if (tpt >= search_tbl->expected_tpt[index])
1616 break;
1617 }
978785a3
TW		 1618 search_tbl->current_rate =
1619 rate_n_flags_from_tbl(priv, search_tbl,
1620 index, is_green);
d6e93399 1621 update_search_tbl_counter = 1;
b481de9c 1622 goto out;
584a0f00
WYG		 1623 case IWL_SISO_SWITCH_MIMO3_ABC:
1624 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1625 memcpy(search_tbl, tbl, sz);
1626 search_tbl->is_SGI = 0;
1627 search_tbl->ant_type = ANT_ABC;
1628
1629 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1630 break;
1631
1632 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1633 search_tbl, index);
1634 if (!ret)
1635 goto out;
1636 break;
b481de9c
ZY		 1637 }
1638 tbl->action++;
584a0f00 1639 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
3110bef7 1640 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
b481de9c
ZY		 1641
1642 if (tbl->action == start_action)
1643 break;
1644 }
3110bef7 1645 search_tbl->lq_type = LQ_NONE;
b481de9c
ZY		 1646 return 0;
1647
1648 out:
3110bef7 1649 lq_sta->search_better_tbl = 1;
b481de9c 1650 tbl->action++;
584a0f00 1651 if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
3110bef7 1652 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
d6e93399
MA		 1653 if (update_search_tbl_counter)
1654 search_tbl->action = tbl->action;
1655
b481de9c
ZY		 1656 return 0;
1657}
1658
77626355 1659/*
584a0f00 1660 * Try to switch to new modulation mode from MIMO2
77626355 1661 */
584a0f00 1662static int rs_move_mimo2_to_other(struct iwl_priv *priv,
e227ceac 1663 struct iwl_lq_sta *lq_sta,
270243a5 1664 struct ieee80211_conf *conf,
4b7679a5 1665 struct ieee80211_sta *sta, int index)
b481de9c 1666{
c33104f0 1667 s8 is_green = lq_sta->is_green;
e227ceac
TW		 1668 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1669 struct iwl_scale_tbl_info *search_tbl =
1670 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
3110bef7 1671 struct iwl_rate_scale_data *window = &(tbl->win[index]);
e227ceac
TW		 1672 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1673 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
b481de9c 1674 u8 start_action = tbl->action;
3110bef7
GC		 1675 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1676 u8 tx_chains_num = priv->hw_params.tx_chains_num;
d6e93399 1677 u8 update_search_tbl_counter = 0;
aade00ce 1678 int ret;
b481de9c 1679
3ad3b92a 1680 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
46f9381a
WYG		 1681 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1682 tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1683 /* switch in SISO */
1684 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1685 }
b481de9c 1686 for (;;) {
c33104f0 1687 lq_sta->action_counter++;
b481de9c 1688 switch (tbl->action) {
3110bef7
GC		 1689 case IWL_MIMO2_SWITCH_ANTENNA1:
1690 case IWL_MIMO2_SWITCH_ANTENNA2:
584a0f00 1691 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
3110bef7
GC		 1692
1693 if (tx_chains_num <= 2)
1694 break;
1695
1696 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1697 break;
1698
1699 memcpy(search_tbl, tbl, sz);
1700 if (rs_toggle_antenna(valid_tx_ant,
d6e93399
MA		 1701 &search_tbl->current_rate, search_tbl)) {
1702 update_search_tbl_counter = 1;
3110bef7 1703 goto out;
d6e93399 1704 }
3110bef7
GC		 1705 break;
1706 case IWL_MIMO2_SWITCH_SISO_A:
1707 case IWL_MIMO2_SWITCH_SISO_B:
1708 case IWL_MIMO2_SWITCH_SISO_C:
e1623446 1709 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
0c11b4de 1710
77626355 1711 /* Set up new search table for SISO */
b481de9c 1712 memcpy(search_tbl, tbl, sz);
39e88504 1713
3110bef7 1714 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
fde0db31 1715 search_tbl->ant_type = ANT_A;
3110bef7 1716 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
fde0db31 1717 search_tbl->ant_type = ANT_B;
3110bef7
GC		 1718 else
1719 search_tbl->ant_type = ANT_C;
1720
1721 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1722 break;
b481de9c 1723
c33104f0 1724 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
270243a5 1725 search_tbl, index);
3110bef7 1726 if (!ret)
b481de9c 1727 goto out;
3110bef7 1728
b481de9c
ZY		 1729 break;
1730
3110bef7 1731 case IWL_MIMO2_SWITCH_GI:
7aafef1c 1732 if (!tbl->is_ht40 &&
a9841013
EG		 1733 !(priv->current_ht_config.sgf &
1734 HT_SHORT_GI_20MHZ))
1735 break;
7aafef1c 1736 if (tbl->is_ht40 &&
a9841013
EG		 1737 !(priv->current_ht_config.sgf &
1738 HT_SHORT_GI_40MHZ))
1739 break;
1740
584a0f00 1741 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
77626355 1742
584a0f00 1743 /* Set up new search table for MIMO2 */
b481de9c 1744 memcpy(search_tbl, tbl, sz);
39e88504 1745 search_tbl->is_SGI = !tbl->is_SGI;
eecd6e57 1746 rs_set_expected_tpt_table(lq_sta, search_tbl);
77626355
BC		 1747 /*
1748 * If active table already uses the fastest possible
1749 * modulation (dual stream with short guard interval),
1750 * and it's working well, there's no need to look
1751 * for a better type of modulation!
1752 */
39e88504 1753 if (tbl->is_SGI) {
c33104f0 1754 s32 tpt = lq_sta->last_tpt / 100;
39e88504
GC		 1755 if (tpt >= search_tbl->expected_tpt[index])
1756 break;
b481de9c 1757 }
978785a3
TW		 1758 search_tbl->current_rate =
1759 rate_n_flags_from_tbl(priv, search_tbl,
1760 index, is_green);
d6e93399 1761 update_search_tbl_counter = 1;
b481de9c
ZY		 1762 goto out;
1763
584a0f00
WYG		 1764 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1765 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1766 memcpy(search_tbl, tbl, sz);
1767 search_tbl->is_SGI = 0;
1768 search_tbl->ant_type = ANT_ABC;
1769
1770 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1771 break;
1772
1773 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1774 search_tbl, index);
1775 if (!ret)
1776 goto out;
1777
1778 break;
b481de9c
ZY		 1779 }
1780 tbl->action++;
584a0f00 1781 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
3110bef7 1782 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
b481de9c
ZY		 1783
1784 if (tbl->action == start_action)
1785 break;
1786 }
3110bef7 1787 search_tbl->lq_type = LQ_NONE;
b481de9c
ZY		 1788 return 0;
1789 out:
3110bef7 1790 lq_sta->search_better_tbl = 1;
b481de9c 1791 tbl->action++;
584a0f00 1792 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
3110bef7 1793 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
d6e93399
MA		 1794 if (update_search_tbl_counter)
1795 search_tbl->action = tbl->action;
1796
b481de9c
ZY		 1797 return 0;
1798
1799}
1800
584a0f00
WYG		 1801/*
1802 * Try to switch to new modulation mode from MIMO3
1803 */
1804static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1805 struct iwl_lq_sta *lq_sta,
1806 struct ieee80211_conf *conf,
1807 struct ieee80211_sta *sta, int index)
1808{
1809 s8 is_green = lq_sta->is_green;
1810 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1811 struct iwl_scale_tbl_info *search_tbl =
1812 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1813 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1814 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1815 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1816 u8 start_action = tbl->action;
1817 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1818 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1819 int ret;
d6e93399 1820 u8 update_search_tbl_counter = 0;
584a0f00 1821
3ad3b92a 1822 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
46f9381a
WYG		 1823 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1824 tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1825 /* switch in SISO */
1826 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1827 }
584a0f00
WYG		 1828 for (;;) {
1829 lq_sta->action_counter++;
1830 switch (tbl->action) {
1831 case IWL_MIMO3_SWITCH_ANTENNA1:
1832 case IWL_MIMO3_SWITCH_ANTENNA2:
1833 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
1834
1835 if (tx_chains_num <= 3)
1836 break;
1837
1838 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1839 break;
1840
1841 memcpy(search_tbl, tbl, sz);
1842 if (rs_toggle_antenna(valid_tx_ant,
1843 &search_tbl->current_rate, search_tbl))
1844 goto out;
1845 break;
1846 case IWL_MIMO3_SWITCH_SISO_A:
1847 case IWL_MIMO3_SWITCH_SISO_B:
1848 case IWL_MIMO3_SWITCH_SISO_C:
1849 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
1850
1851 /* Set up new search table for SISO */
1852 memcpy(search_tbl, tbl, sz);
1853
1854 if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
1855 search_tbl->ant_type = ANT_A;
1856 else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
1857 search_tbl->ant_type = ANT_B;
1858 else
1859 search_tbl->ant_type = ANT_C;
1860
1861 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1862 break;
1863
1864 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1865 search_tbl, index);
1866 if (!ret)
1867 goto out;
1868
1869 break;
1870
1871 case IWL_MIMO3_SWITCH_MIMO2_AB:
1872 case IWL_MIMO3_SWITCH_MIMO2_AC:
1873 case IWL_MIMO3_SWITCH_MIMO2_BC:
1874 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
1875
1876 memcpy(search_tbl, tbl, sz);
1877 search_tbl->is_SGI = 0;
1878 if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
1879 search_tbl->ant_type = ANT_AB;
1880 else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
1881 search_tbl->ant_type = ANT_AC;
1882 else
1883 search_tbl->ant_type = ANT_BC;
1884
1885 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1886 break;
1887
1888 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1889 search_tbl, index);
1890 if (!ret)
1891 goto out;
1892
1893 break;
1894
1895 case IWL_MIMO3_SWITCH_GI:
7aafef1c 1896 if (!tbl->is_ht40 &&
584a0f00
WYG		 1897 !(priv->current_ht_config.sgf &
1898 HT_SHORT_GI_20MHZ))
1899 break;
7aafef1c 1900 if (tbl->is_ht40 &&
584a0f00
WYG		 1901 !(priv->current_ht_config.sgf &
1902 HT_SHORT_GI_40MHZ))
1903 break;
1904
1905 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
1906
1907 /* Set up new search table for MIMO */
1908 memcpy(search_tbl, tbl, sz);
1909 search_tbl->is_SGI = !tbl->is_SGI;
1910 rs_set_expected_tpt_table(lq_sta, search_tbl);
1911 /*
1912 * If active table already uses the fastest possible
1913 * modulation (dual stream with short guard interval),
1914 * and it's working well, there's no need to look
1915 * for a better type of modulation!
1916 */
1917 if (tbl->is_SGI) {
1918 s32 tpt = lq_sta->last_tpt / 100;
1919 if (tpt >= search_tbl->expected_tpt[index])
1920 break;
1921 }
1922 search_tbl->current_rate =
1923 rate_n_flags_from_tbl(priv, search_tbl,
1924 index, is_green);
d6e93399 1925 update_search_tbl_counter = 1;
584a0f00
WYG		 1926 goto out;
1927 }
1928 tbl->action++;
1929 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1930 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1931
1932 if (tbl->action == start_action)
1933 break;
1934 }
1935 search_tbl->lq_type = LQ_NONE;
1936 return 0;
1937 out:
1938 lq_sta->search_better_tbl = 1;
1939 tbl->action++;
1940 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1941 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
d6e93399
MA		 1942 if (update_search_tbl_counter)
1943 search_tbl->action = tbl->action;
1944
584a0f00
WYG		 1945 return 0;
1946
1947}
1948
77626355
BC		 1949/*
1950 * Check whether we should continue using same modulation mode, or
1951 * begin search for a new mode, based on:
1952 * 1) # tx successes or failures while using this mode
1953 * 2) # times calling this function
1954 * 3) elapsed time in this mode (not used, for now)
1955 */
e227ceac 1956static void rs_stay_in_table(struct iwl_lq_sta *lq_sta)
b481de9c 1957{
e227ceac 1958 struct iwl_scale_tbl_info *tbl;
b481de9c
ZY		 1959 int i;
1960 int active_tbl;
1961 int flush_interval_passed = 0;
bf403db8 1962 struct iwl_priv *priv;
b481de9c 1963
bf403db8 1964 priv = lq_sta->drv;
c33104f0 1965 active_tbl = lq_sta->active_tbl;
b481de9c 1966
c33104f0 1967 tbl = &(lq_sta->lq_info[active_tbl]);
b481de9c 1968
77626355 1969 /* If we've been disallowing search, see if we should now allow it */
c33104f0 1970 if (lq_sta->stay_in_tbl) {
b481de9c 1971
77626355 1972 /* Elapsed time using current modulation mode */
c33104f0 1973 if (lq_sta->flush_timer)
b481de9c 1974 flush_interval_passed =
447fee70
MA		 1975 time_after(jiffies,
1976 (unsigned long)(lq_sta->flush_timer +
b481de9c
ZY		 1977 IWL_RATE_SCALE_FLUSH_INTVL));
1978
77626355
BC		 1979 /*
1980 * Check if we should allow search for new modulation mode.
1981 * If many frames have failed or succeeded, or we've used
1982 * this same modulation for a long time, allow search, and
1983 * reset history stats that keep track of whether we should
1984 * allow a new search. Also (below) reset all bitmaps and
1985 * stats in active history.
1986 */
c33104f0
TW		 1987 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1988 (lq_sta->total_success > lq_sta->max_success_limit) ||
1989 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
b481de9c 1990 && (flush_interval_passed))) {
e1623446 1991 IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n:",
c33104f0
TW		 1992 lq_sta->total_failed,
1993 lq_sta->total_success,
b481de9c 1994 flush_interval_passed);
77626355
BC		 1995
1996 /* Allow search for new mode */
c33104f0
TW		 1997 lq_sta->stay_in_tbl = 0; /* only place reset */
1998 lq_sta->total_failed = 0;
1999 lq_sta->total_success = 0;
2000 lq_sta->flush_timer = 0;
77626355
BC		 2001
2002 /*
2003 * Else if we've used this modulation mode enough repetitions
2004 * (regardless of elapsed time or success/failure), reset
2005 * history bitmaps and rate-specific stats for all rates in
2006 * active table.
2007 */
403ab56b 2008 } else {
c33104f0
TW		 2009 lq_sta->table_count++;
2010 if (lq_sta->table_count >=
2011 lq_sta->table_count_limit) {
2012 lq_sta->table_count = 0;
b481de9c 2013
e1623446 2014 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
b481de9c
ZY		 2015 for (i = 0; i < IWL_RATE_COUNT; i++)
2016 rs_rate_scale_clear_window(
2017 &(tbl->win[i]));
2018 }
2019 }
2020
77626355
BC		 2021 /* If transitioning to allow "search", reset all history
2022 * bitmaps and stats in active table (this will become the new
2023 * "search" table). */
c33104f0 2024 if (!lq_sta->stay_in_tbl) {
b481de9c
ZY		 2025 for (i = 0; i < IWL_RATE_COUNT; i++)
2026 rs_rate_scale_clear_window(&(tbl->win[i]));
2027 }
2028 }
2029}
2030
e3139fe7
WYG		 2031/*
2032 * setup rate table in uCode
2033 * return rate_n_flags as used in the table
2034 */
2035static u32 rs_update_rate_tbl(struct iwl_priv *priv,
2036 struct iwl_lq_sta *lq_sta,
2037 struct iwl_scale_tbl_info *tbl,
2038 int index, u8 is_green)
2039{
2040 u32 rate;
2041
2042 /* Update uCode's rate table. */
2043 rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2044 rs_fill_link_cmd(priv, lq_sta, rate);
2045 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2046
2047 return rate;
2048}
2049
77626355
BC		 2050/*
2051 * Do rate scaling and search for new modulation mode.
2052 */
c79dd5b5 2053static void rs_rate_scale_perform(struct iwl_priv *priv,
514d65c1 2054 struct sk_buff *skb,
4b7679a5
JB		 2055 struct ieee80211_sta *sta,
2056 struct iwl_lq_sta *lq_sta)
b481de9c 2057{
4b7679a5 2058 struct ieee80211_hw *hw = priv->hw;
270243a5 2059 struct ieee80211_conf *conf = &hw->conf;
514d65c1
GS		 2060 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2061 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
b481de9c
ZY		 2062 int low = IWL_RATE_INVALID;
2063 int high = IWL_RATE_INVALID;
2064 int index;
2065 int i;
e227ceac 2066 struct iwl_rate_scale_data *window = NULL;
b481de9c
ZY		 2067 int current_tpt = IWL_INVALID_VALUE;
2068 int low_tpt = IWL_INVALID_VALUE;
2069 int high_tpt = IWL_INVALID_VALUE;
2070 u32 fail_count;
2071 s8 scale_action = 0;
fd7c8a40 2072 u16 rate_mask;
b481de9c 2073 u8 update_lq = 0;
e227ceac 2074 struct iwl_scale_tbl_info *tbl, *tbl1;
b481de9c 2075 u16 rate_scale_index_msk = 0;
39e88504 2076 u32 rate;
b481de9c
ZY		 2077 u8 is_green = 0;
2078 u8 active_tbl = 0;
2079 u8 done_search = 0;
2080 u16 high_low;
a5e8b505 2081 s32 sr;
0c11b4de 2082 u8 tid = MAX_TID_COUNT;
86b4766b 2083 struct iwl_tid_data *tid_data;
b481de9c 2084
e1623446 2085 IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
b481de9c 2086
514d65c1 2087 /* Send management frames and NO_ACK data using lowest rate. */
417f114b
TW		 2088 /* TODO: this could probably be improved.. */
2089 if (!ieee80211_is_data(hdr->frame_control) ||
514d65c1 2090 info->flags & IEEE80211_TX_CTL_NO_ACK)
b481de9c 2091 return;
b481de9c 2092
4b7679a5 2093 if (!sta || !lq_sta)
b481de9c
ZY		 2094 return;
2095
4b7679a5 2096 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
b481de9c 2097
faa29718
RR		 2098 tid = rs_tl_add_packet(lq_sta, hdr);
2099
77626355
BC		 2100 /*
2101 * Select rate-scale / modulation-mode table to work with in
2102 * the rest of this function: "search" if searching for better
2103 * modulation mode, or "active" if doing rate scaling within a mode.
2104 */
c33104f0
TW		 2105 if (!lq_sta->search_better_tbl)
2106 active_tbl = lq_sta->active_tbl;
b481de9c 2107 else
c33104f0 2108 active_tbl = 1 - lq_sta->active_tbl;
b481de9c 2109
c33104f0 2110 tbl = &(lq_sta->lq_info[active_tbl]);
2681b20b
WYG		 2111 if (is_legacy(tbl->lq_type))
2112 lq_sta->is_green = 0;
2113 else
2114 lq_sta->is_green = rs_use_green(priv, conf);
c33104f0 2115 is_green = lq_sta->is_green;
b481de9c 2116
77626355 2117 /* current tx rate */
b7e35008 2118 index = lq_sta->last_txrate_idx;
b481de9c 2119
e1623446 2120 IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
b481de9c
ZY		 2121 tbl->lq_type);
2122
77626355 2123 /* rates available for this association, and for modulation mode */
eecd6e57 2124 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
b481de9c 2125
e1623446 2126 IWL_DEBUG_RATE(priv, "mask 0x%04X \n", rate_mask);
b481de9c
ZY		 2127
2128 /* mask with station rate restriction */
2129 if (is_legacy(tbl->lq_type)) {
8318d78a 2130 if (lq_sta->band == IEEE80211_BAND_5GHZ)
77626355 2131 /* supp_rates has no CCK bits in A mode */
b481de9c 2132 rate_scale_index_msk = (u16) (rate_mask &
c33104f0 2133 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
b481de9c
ZY		 2134 else
2135 rate_scale_index_msk = (u16) (rate_mask &
c33104f0 2136 lq_sta->supp_rates);
b481de9c
ZY		 2137
2138 } else
2139 rate_scale_index_msk = rate_mask;
2140
2141 if (!rate_scale_index_msk)
2142 rate_scale_index_msk = rate_mask;
2143
07bc28ed 2144 if (!((1 << index) & rate_scale_index_msk)) {
15b1687c 2145 IWL_ERR(priv, "Current Rate is not valid\n");
e3139fe7
WYG		 2146 if (lq_sta->search_better_tbl) {
2147 /* revert to active table if search table is not valid*/
2148 tbl->lq_type = LQ_NONE;
2149 lq_sta->search_better_tbl = 0;
2150 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2151 /* get "active" rate info */
2152 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2153 rate = rs_update_rate_tbl(priv, lq_sta,
2154 tbl, index, is_green);
2155 }
07bc28ed 2156 return;
b481de9c
ZY		 2157 }
2158
77626355 2159 /* Get expected throughput table and history window for current rate */
07bc28ed 2160 if (!tbl->expected_tpt) {
15b1687c 2161 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
07bc28ed
GC		 2162 return;
2163 }
b481de9c 2164
c6ec7a9b
AM		 2165 /* force user max rate if set by user */
2166 if ((lq_sta->max_rate_idx != -1) &&
2167 (lq_sta->max_rate_idx < index)) {
2168 index = lq_sta->max_rate_idx;
2169 update_lq = 1;
2170 window = &(tbl->win[index]);
2171 goto lq_update;
2172 }
2173
b481de9c
ZY		 2174 window = &(tbl->win[index]);
2175
77626355
BC		 2176 /*
2177 * If there is not enough history to calculate actual average
2178 * throughput, keep analyzing results of more tx frames, without
2179 * changing rate or mode (bypass most of the rest of this function).
2180 * Set up new rate table in uCode only if old rate is not supported
2181 * in current association (use new rate found above).
2182 */
b481de9c 2183 fail_count = window->counter - window->success_counter;
07bc28ed
GC		 2184 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2185 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
e1623446 2186 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
b481de9c
ZY		 2187 "for index %d\n",
2188 window->success_counter, window->counter, index);
77626355
BC		 2189
2190 /* Can't calculate this yet; not enough history */
b481de9c 2191 window->average_tpt = IWL_INVALID_VALUE;
77626355
BC		 2192
2193 /* Should we stay with this modulation mode,
2194 * or search for a new one? */
c33104f0 2195 rs_stay_in_table(lq_sta);
77626355 2196
b481de9c 2197 goto out;
3110bef7 2198 }
b481de9c 2199
77626355
BC		 2200 /* Else we have enough samples; calculate estimate of
2201 * actual average throughput */
3110bef7
GC		 2202
2203 BUG_ON(window->average_tpt != ((window->success_ratio *
2204 tbl->expected_tpt[index] + 64) / 128));
b481de9c 2205
77626355 2206 /* If we are searching for better modulation mode, check success. */
46f9381a 2207 if (lq_sta->search_better_tbl &&
3ad3b92a 2208 (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
77626355
BC		 2209 /* If good success, continue using the "search" mode;
2210 * no need to send new link quality command, since we're
2211 * continuing to use the setup that we've been trying. */
07bc28ed
GC		 2212 if (window->average_tpt > lq_sta->last_tpt) {
2213
e1623446 2214 IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
07bc28ed
GC		 2215 "suc=%d cur-tpt=%d old-tpt=%d\n",
2216 window->success_ratio,
2217 window->average_tpt,
2218 lq_sta->last_tpt);
2219
2220 if (!is_legacy(tbl->lq_type))
c33104f0 2221 lq_sta->enable_counter = 1;
07bc28ed 2222
77626355 2223 /* Swap tables; "search" becomes "active" */
c33104f0 2224 lq_sta->active_tbl = active_tbl;
b481de9c 2225 current_tpt = window->average_tpt;
77626355
BC		 2226
2227 /* Else poor success; go back to mode in "active" table */
b481de9c 2228 } else {
07bc28ed 2229
e1623446 2230 IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
07bc28ed
GC		 2231 "suc=%d cur-tpt=%d old-tpt=%d\n",
2232 window->success_ratio,
2233 window->average_tpt,
2234 lq_sta->last_tpt);
2235
77626355 2236 /* Nullify "search" table */
b481de9c 2237 tbl->lq_type = LQ_NONE;
77626355
BC		 2238
2239 /* Revert to "active" table */
c33104f0
TW		 2240 active_tbl = lq_sta->active_tbl;
2241 tbl = &(lq_sta->lq_info[active_tbl]);
b481de9c 2242
77626355 2243 /* Revert to "active" rate and throughput info */
e7d326ac 2244 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
c33104f0 2245 current_tpt = lq_sta->last_tpt;
b481de9c 2246
77626355 2247 /* Need to set up a new rate table in uCode */
b481de9c 2248 update_lq = 1;
b481de9c 2249 }
77626355
BC		 2250
2251 /* Either way, we've made a decision; modulation mode
2252 * search is done, allow rate adjustment next time. */
c33104f0 2253 lq_sta->search_better_tbl = 0;
77626355 2254 done_search = 1; /* Don't switch modes below! */
b481de9c
ZY		 2255 goto lq_update;
2256 }
2257
77626355
BC		 2258 /* (Else) not in search of better modulation mode, try for better
2259 * starting rate, while staying in this mode. */
bf403db8 2260 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
b481de9c
ZY		 2261 tbl->lq_type);
2262 low = high_low & 0xff;
2263 high = (high_low >> 8) & 0xff;
2264
c6ec7a9b
AM		 2265 /* If user set max rate, dont allow higher than user constrain */
2266 if ((lq_sta->max_rate_idx != -1) &&
2267 (lq_sta->max_rate_idx < high))
2268 high = IWL_RATE_INVALID;
2269
a5e8b505
GC		 2270 sr = window->success_ratio;
2271
77626355 2272 /* Collect measured throughputs for current and adjacent rates */
b481de9c 2273 current_tpt = window->average_tpt;
b481de9c
ZY		 2274 if (low != IWL_RATE_INVALID)
2275 low_tpt = tbl->win[low].average_tpt;
b481de9c
ZY		 2276 if (high != IWL_RATE_INVALID)
2277 high_tpt = tbl->win[high].average_tpt;
2278
a5e8b505 2279 scale_action = 0;
b481de9c 2280
77626355 2281 /* Too many failures, decrease rate */
a5e8b505 2282 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
e1623446 2283 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
b481de9c 2284 scale_action = -1;
77626355
BC		 2285
2286 /* No throughput measured yet for adjacent rates; try increase. */
b481de9c 2287 } else if ((low_tpt == IWL_INVALID_VALUE) &&
a5e8b505
GC		 2288 (high_tpt == IWL_INVALID_VALUE)) {
2289
2290 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2291 scale_action = 1;
2292 else if (low != IWL_RATE_INVALID)
8fe72311 2293 scale_action = 0;
a5e8b505 2294 }
77626355
BC		 2295
2296 /* Both adjacent throughputs are measured, but neither one has better
2297 * throughput; we're using the best rate, don't change it! */
b481de9c
ZY		 2298 else if ((low_tpt != IWL_INVALID_VALUE) &&
2299 (high_tpt != IWL_INVALID_VALUE) &&
2300 (low_tpt < current_tpt) &&
2301 (high_tpt < current_tpt))
2302 scale_action = 0;
77626355
BC		 2303
2304 /* At least one adjacent rate's throughput is measured,
2305 * and may have better performance. */
b481de9c 2306 else {
77626355 2307 /* Higher adjacent rate's throughput is measured */
b481de9c 2308 if (high_tpt != IWL_INVALID_VALUE) {
77626355 2309 /* Higher rate has better throughput */
a5e8b505
GC		 2310 if (high_tpt > current_tpt &&
2311 sr >= IWL_RATE_INCREASE_TH) {
b481de9c 2312 scale_action = 1;
a5e8b505 2313 } else {
8fe72311 2314 scale_action = 0;
b481de9c 2315 }
77626355
BC		 2316
2317 /* Lower adjacent rate's throughput is measured */
b481de9c 2318 } else if (low_tpt != IWL_INVALID_VALUE) {
77626355 2319 /* Lower rate has better throughput */
b481de9c 2320 if (low_tpt > current_tpt) {
e1623446
TW		 2321 IWL_DEBUG_RATE(priv,
2322 "decrease rate because of low tpt\n");
b481de9c 2323 scale_action = -1;
a5e8b505 2324 } else if (sr >= IWL_RATE_INCREASE_TH) {
b481de9c 2325 scale_action = 1;
a5e8b505 2326 }
b481de9c
ZY		 2327 }
2328 }
2329
77626355
BC		 2330 /* Sanity check; asked for decrease, but success rate or throughput
2331 * has been good at old rate. Don't change it. */
a5e8b505
GC		 2332 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2333 ((sr > IWL_RATE_HIGH_TH) ||
b481de9c 2334 (current_tpt > (100 * tbl->expected_tpt[low]))))
b481de9c 2335 scale_action = 0;
46f9381a
WYG		 2336 if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2337 scale_action = -1;
3ad3b92a 2338 if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
46f9381a
WYG		 2339 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2340 scale_action = -1;
b481de9c
ZY		 2341 switch (scale_action) {
2342 case -1:
77626355 2343 /* Decrease starting rate, update uCode's rate table */
b481de9c
ZY		 2344 if (low != IWL_RATE_INVALID) {
2345 update_lq = 1;
2346 index = low;
2347 }
447fee70 2348
b481de9c
ZY		 2349 break;
2350 case 1:
77626355 2351 /* Increase starting rate, update uCode's rate table */
b481de9c
ZY		 2352 if (high != IWL_RATE_INVALID) {
2353 update_lq = 1;
2354 index = high;
2355 }
2356
2357 break;
2358 case 0:
77626355 2359 /* No change */
b481de9c
ZY		 2360 default:
2361 break;
2362 }
2363
e1623446 2364 IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
b481de9c
ZY		 2365 "high %d type %d\n",
2366 index, scale_action, low, high, tbl->lq_type);
2367
a5e8b505 2368lq_update:
77626355 2369 /* Replace uCode's rate table for the destination station. */
e3139fe7
WYG		 2370 if (update_lq)
2371 rate = rs_update_rate_tbl(priv, lq_sta,
2372 tbl, index, is_green);
77626355 2373
3ad3b92a 2374 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
46f9381a
WYG		 2375 /* Should we stay with this modulation mode,
2376 * or search for a new one? */
2377 rs_stay_in_table(lq_sta);
2378 }
77626355
BC		 2379 /*
2380 * Search for new modulation mode if we're:
2381 * 1) Not changing rates right now
2382 * 2) Not just finishing up a search
2383 * 3) Allowing a new search
2384 */
47cfd463 2385 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
77626355 2386 /* Save current throughput to compare with "search" throughput*/
c33104f0 2387 lq_sta->last_tpt = current_tpt;
b481de9c 2388
77626355
BC		 2389 /* Select a new "search" modulation mode to try.
2390 * If one is found, set up the new "search" table. */
b481de9c 2391 if (is_legacy(tbl->lq_type))
c33104f0 2392 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
b481de9c 2393 else if (is_siso(tbl->lq_type))
c33104f0 2394 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
584a0f00
WYG		 2395 else if (is_mimo2(tbl->lq_type))
2396 rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
b481de9c 2397 else
584a0f00 2398 rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
b481de9c 2399
77626355 2400 /* If new "search" mode was selected, set up in uCode table */
c33104f0 2401 if (lq_sta->search_better_tbl) {
77626355 2402 /* Access the "search" table, clear its history. */
c33104f0 2403 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
b481de9c
ZY		 2404 for (i = 0; i < IWL_RATE_COUNT; i++)
2405 rs_rate_scale_clear_window(&(tbl->win[i]));
2406
77626355 2407 /* Use new "search" start rate */
e7d326ac 2408 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
b481de9c 2409
e1623446 2410 IWL_DEBUG_RATE(priv, "Switch current mcs: %X index: %d\n",
39e88504 2411 tbl->current_rate, index);
07bc28ed 2412 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
66c73db7 2413 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
447fee70
MA		 2414 } else
2415 done_search = 1;
2416 }
b481de9c 2417
447fee70 2418 if (done_search && !lq_sta->stay_in_tbl) {
77626355
BC		 2419 /* If the "active" (non-search) mode was legacy,
2420 * and we've tried switching antennas,
2421 * but we haven't been able to try HT modes (not available),
2422 * stay with best antenna legacy modulation for a while
2423 * before next round of mode comparisons. */
c33104f0 2424 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
de27e64e 2425 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
d6e93399 2426 lq_sta->action_counter > tbl1->max_search) {
e1623446 2427 IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
bf403db8 2428 rs_set_stay_in_table(priv, 1, lq_sta);
b481de9c
ZY		 2429 }
2430
77626355
BC		 2431 /* If we're in an HT mode, and all 3 mode switch actions
2432 * have been tried and compared, stay in this best modulation
2433 * mode for a while before next round of mode comparisons. */
c33104f0 2434 if (lq_sta->enable_counter &&
46f9381a
WYG		 2435 (lq_sta->action_counter >= tbl1->max_search) &&
2436 iwl_ht_enabled(priv)) {
0c11b4de
RR		 2437 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2438 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2439 (tid != MAX_TID_COUNT)) {
86b4766b
WYG		 2440 tid_data =
2441 &priv->stations[lq_sta->lq.sta_id].tid[tid];
2442 if (tid_data->agg.state == IWL_AGG_OFF) {
2443 IWL_DEBUG_RATE(priv,
2444 "try to aggregate tid %d\n",
2445 tid);
2446 rs_tl_turn_on_agg(priv, tid,
2447 lq_sta, sta);
2448 }
b481de9c 2449 }
bf403db8 2450 rs_set_stay_in_table(priv, 0, lq_sta);
b481de9c 2451 }
b481de9c
ZY		 2452 }
2453
2454out:
978785a3 2455 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
b481de9c 2456 i = index;
b7e35008 2457 lq_sta->last_txrate_idx = i;
b481de9c 2458
b481de9c
ZY		 2459 return;
2460}
2461
2462
c79dd5b5 2463static void rs_initialize_lq(struct iwl_priv *priv,
270243a5 2464 struct ieee80211_conf *conf,
4b7679a5
JB		 2465 struct ieee80211_sta *sta,
2466 struct iwl_lq_sta *lq_sta)
b481de9c 2467{
e227ceac 2468 struct iwl_scale_tbl_info *tbl;
b481de9c 2469 int rate_idx;
aade00ce 2470 int i;
39e88504 2471 u32 rate;
aade00ce
GC		 2472 u8 use_green = rs_use_green(priv, conf);
2473 u8 active_tbl = 0;
2474 u8 valid_tx_ant;
b481de9c 2475
4b7679a5 2476 if (!sta || !lq_sta)
b481de9c
ZY		 2477 goto out;
2478
b7e35008 2479 i = lq_sta->last_txrate_idx;
b481de9c 2480
c33104f0 2481 if ((lq_sta->lq.sta_id == 0xff) &&
05c914fe 2482 (priv->iw_mode == NL80211_IFTYPE_ADHOC))
b481de9c
ZY		 2483 goto out;
2484
aade00ce
GC		 2485 valid_tx_ant = priv->hw_params.valid_tx_ant;
2486
c33104f0
TW		 2487 if (!lq_sta->search_better_tbl)
2488 active_tbl = lq_sta->active_tbl;
b481de9c 2489 else
c33104f0 2490 active_tbl = 1 - lq_sta->active_tbl;
b481de9c 2491
c33104f0 2492 tbl = &(lq_sta->lq_info[active_tbl]);
b481de9c
ZY		 2493
2494 if ((i < 0) || (i >= IWL_RATE_COUNT))
2495 i = 0;
2496
1826dcc0 2497 rate = iwl_rates[i].plcp;
eb48dcaf
WT		 2498 tbl->ant_type = first_antenna(valid_tx_ant);
2499 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
b481de9c
ZY		 2500
2501 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
39e88504 2502 rate |= RATE_MCS_CCK_MSK;
b481de9c 2503
39e88504 2504 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
aade00ce
GC		 2505 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2506 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
b481de9c 2507
978785a3 2508 rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
39e88504 2509 tbl->current_rate = rate;
eecd6e57 2510 rs_set_expected_tpt_table(lq_sta, tbl);
07bc28ed 2511 rs_fill_link_cmd(NULL, lq_sta, rate);
66c73db7 2512 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
b481de9c
ZY		 2513 out:
2514 return;
2515}
2516
e6a9854b
JB		 2517static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2518 struct ieee80211_tx_rate_control *txrc)
b481de9c
ZY		 2519{
2520
e6a9854b
JB		 2521 struct sk_buff *skb = txrc->skb;
2522 struct ieee80211_supported_band *sband = txrc->sband;
4b7679a5
JB		 2523 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2524 struct ieee80211_conf *conf = &priv->hw->conf;
7869b0ea 2525 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
b481de9c 2526 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
e6a9854b 2527 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
417f114b
TW		 2528 struct iwl_lq_sta *lq_sta = priv_sta;
2529 int rate_idx;
b481de9c 2530
e1623446 2531 IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
b481de9c 2532
c6ec7a9b
AM		 2533 /* Get max rate if user set max rate */
2534 if (lq_sta) {
2535 lq_sta->max_rate_idx = txrc->max_rate_idx;
2536 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2537 (lq_sta->max_rate_idx != -1))
2538 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2539 if ((lq_sta->max_rate_idx < 0) ||
2540 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2541 lq_sta->max_rate_idx = -1;
2542 }
2543
514d65c1 2544 /* Send management frames and NO_ACK data using lowest rate. */
4c6d4f5c 2545 if (rate_control_send_low(sta, priv_sta, txrc))
4b7679a5 2546 return;
b481de9c 2547
417f114b 2548 rate_idx = lq_sta->last_txrate_idx;
b481de9c 2549
05c914fe 2550 if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
c33104f0 2551 !lq_sta->ibss_sta_added) {
c587de0b 2552 u8 sta_id = iwl_find_station(priv, hdr->addr1);
b481de9c
ZY		 2553
2554 if (sta_id == IWL_INVALID_STATION) {
e1623446 2555 IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n",
e174961c 2556 hdr->addr1);
c587de0b 2557 sta_id = iwl_add_station(priv, hdr->addr1,
7869b0ea 2558 false, CMD_ASYNC, ht_cap);
b481de9c
ZY		 2559 }
2560 if ((sta_id != IWL_INVALID_STATION)) {
c33104f0
TW		 2561 lq_sta->lq.sta_id = sta_id;
2562 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2563 lq_sta->ibss_sta_added = 1;
4b7679a5 2564 rs_initialize_lq(priv, conf, sta, lq_sta);
b481de9c 2565 }
b481de9c
ZY		 2566 }
2567
a9c146b3 2568 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
417f114b 2569 rate_idx -= IWL_FIRST_OFDM_RATE;
a9c146b3
WYG		 2570 /* 6M and 9M shared same MCS index */
2571 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2572 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2573 IWL_RATE_MIMO3_6M_PLCP)
2574 rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2575 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2576 IWL_RATE_MIMO2_6M_PLCP)
2577 rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2578 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2579 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2580 info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2581 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2582 info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
7aafef1c 2583 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
a9c146b3
WYG		 2584 info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2585 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2586 info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2587 } else {
2588 if (rate_idx < 0 || rate_idx > IWL_RATE_COUNT)
2589 rate_idx = rate_lowest_index(sband, sta);
2590 else if (sband->band == IEEE80211_BAND_5GHZ)
2591 rate_idx -= IWL_FIRST_OFDM_RATE;
2592 }
417f114b 2593 info->control.rates[0].idx = rate_idx;
a9c146b3 2594
b481de9c
ZY		 2595}
2596
4b7679a5
JB		 2597static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2598 gfp_t gfp)
b481de9c 2599{
e227ceac 2600 struct iwl_lq_sta *lq_sta;
bf403db8 2601 struct iwl_priv *priv;
b481de9c
ZY		 2602 int i, j;
2603
bf403db8 2604 priv = (struct iwl_priv *)priv_rate;
e1623446 2605 IWL_DEBUG_RATE(priv, "create station rate scale window\n");
b481de9c 2606
e227ceac 2607 lq_sta = kzalloc(sizeof(struct iwl_lq_sta), gfp);
b481de9c 2608
c33104f0 2609 if (lq_sta == NULL)
b481de9c 2610 return NULL;
c33104f0 2611 lq_sta->lq.sta_id = 0xff;
b481de9c 2612
63fddb9f 2613
b481de9c
ZY		 2614 for (j = 0; j < LQ_SIZE; j++)
2615 for (i = 0; i < IWL_RATE_COUNT; i++)
3ac7f146 2616 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
b481de9c 2617
c33104f0 2618 return lq_sta;
b481de9c
ZY		 2619}
2620
4b7679a5
JB		 2621static void rs_rate_init(void *priv_r, struct ieee80211_supported_band *sband,
2622 struct ieee80211_sta *sta, void *priv_sta)
b481de9c
ZY		 2623{
2624 int i, j;
4b7679a5
JB		 2625 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2626 struct ieee80211_conf *conf = &priv->hw->conf;
7869b0ea 2627 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
e227ceac 2628 struct iwl_lq_sta *lq_sta = priv_sta;
d5e49036 2629 u16 mask_bit = 0;
7d049e5a
AM		 2630 int count;
2631 int start_rate = 0;
b481de9c 2632
c33104f0 2633 lq_sta->flush_timer = 0;
4b7679a5 2634 lq_sta->supp_rates = sta->supp_rates[sband->band];
b481de9c
ZY		 2635 for (j = 0; j < LQ_SIZE; j++)
2636 for (i = 0; i < IWL_RATE_COUNT; i++)
3ac7f146 2637 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
b481de9c 2638
e1623446 2639 IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init ***\n");
b481de9c
ZY		 2640 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2641 * the lowest or the highest rate.. Could consider using RSSI from
2642 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2643 * after assoc.. */
2644
c33104f0 2645 lq_sta->ibss_sta_added = 0;
05c914fe 2646 if (priv->iw_mode == NL80211_IFTYPE_AP) {
c587de0b 2647 u8 sta_id = iwl_find_station(priv,
e11bc028 2648 sta->addr);
0795af57 2649
b481de9c 2650 /* for IBSS the call are from tasklet */
e1623446 2651 IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n", sta->addr);
b481de9c
ZY		 2652
2653 if (sta_id == IWL_INVALID_STATION) {
e1623446 2654 IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n", sta->addr);
c587de0b 2655 sta_id = iwl_add_station(priv, sta->addr, false,
7869b0ea 2656 CMD_ASYNC, ht_cap);
b481de9c
ZY		 2657 }
2658 if ((sta_id != IWL_INVALID_STATION)) {
c33104f0
TW		 2659 lq_sta->lq.sta_id = sta_id;
2660 lq_sta->lq.rs_table[0].rate_n_flags = 0;
b481de9c
ZY		 2661 }
2662 /* FIXME: this is w/a remove it later */
2663 priv->assoc_station_added = 1;
2664 }
2665
c33104f0 2666 lq_sta->is_dup = 0;
c6ec7a9b 2667 lq_sta->max_rate_idx = -1;
7d049e5a 2668 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
c33104f0 2669 lq_sta->is_green = rs_use_green(priv, conf);
39e88504 2670 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
c33104f0 2671 lq_sta->active_rate_basic = priv->active_rate_basic;
8318d78a 2672 lq_sta->band = priv->band;
77626355
BC		 2673 /*
2674 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2675 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2676 */
7869b0ea
DH		 2677 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2678 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
c33104f0 2679 lq_sta->active_siso_rate &= ~((u16)0x2);
fde0db31 2680 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
b481de9c 2681
77626355 2682 /* Same here */
7869b0ea
DH		 2683 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2684 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
fde0db31
GC		 2685 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2686 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2687
7869b0ea
DH		 2688 lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2689 lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
fde0db31
GC		 2690 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2691 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2692
e1623446 2693 IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
c33104f0 2694 lq_sta->active_siso_rate,
fde0db31
GC		 2695 lq_sta->active_mimo2_rate,
2696 lq_sta->active_mimo3_rate);
2697
a96a27f9 2698 /* These values will be overridden later */
07bc28ed
GC		 2699 lq_sta->lq.general_params.single_stream_ant_msk = ANT_A;
2700 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2701
0c11b4de
RR		 2702 /* as default allow aggregation for all tids */
2703 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
c33104f0 2704 lq_sta->drv = priv;
b481de9c 2705
d5e49036 2706 /* Find highest tx rate supported by hardware and destination station */
7d049e5a
AM		 2707 mask_bit = sta->supp_rates[sband->band];
2708 count = sband->n_bitrates;
2709 if (sband->band == IEEE80211_BAND_5GHZ) {
2710 count += IWL_FIRST_OFDM_RATE;
2711 start_rate = IWL_FIRST_OFDM_RATE;
2712 mask_bit <<= IWL_FIRST_OFDM_RATE;
2713 }
2714
2715 mask_bit = mask_bit & lq_sta->active_legacy_rate;
2716 lq_sta->last_txrate_idx = 4;
2717 for (i = start_rate; i < count; i++)
d5e49036
MA		 2718 if (mask_bit & BIT(i))
2719 lq_sta->last_txrate_idx = i;
2720
4b7679a5 2721 rs_initialize_lq(priv, conf, sta, lq_sta);
b481de9c
ZY		 2722}
2723
46f9381a 2724static void rs_fill_link_cmd(struct iwl_priv *priv,
e227ceac 2725 struct iwl_lq_sta *lq_sta, u32 new_rate)
b481de9c 2726{
e227ceac 2727 struct iwl_scale_tbl_info tbl_type;
b481de9c 2728 int index = 0;
b481de9c 2729 int rate_idx;
1b696de2 2730 int repeat_rate = 0;
aade00ce 2731 u8 ant_toggle_cnt = 0;
b481de9c 2732 u8 use_ht_possible = 1;
aade00ce 2733 u8 valid_tx_ant = 0;
07bc28ed 2734 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
b481de9c 2735
77626355 2736 /* Override starting rate (index 0) if needed for debug purposes */
39e88504 2737 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
98d7e09a 2738
39e88504 2739 /* Interpret new_rate (rate_n_flags) */
aade00ce 2740 memset(&tbl_type, 0, sizeof(tbl_type));
39e88504 2741 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
b481de9c
ZY		 2742 &tbl_type, &rate_idx);
2743
77626355 2744 /* How many times should we repeat the initial rate? */
b481de9c 2745 if (is_legacy(tbl_type.lq_type)) {
aade00ce 2746 ant_toggle_cnt = 1;
1b696de2 2747 repeat_rate = IWL_NUMBER_TRY;
aade00ce 2748 } else {
1b696de2 2749 repeat_rate = IWL_HT_NUMBER_TRY;
aade00ce 2750 }
b481de9c
ZY		 2751
2752 lq_cmd->general_params.mimo_delimiter =
2753 is_mimo(tbl_type.lq_type) ? 1 : 0;
77626355
BC		 2754
2755 /* Fill 1st table entry (index 0) */
39e88504 2756 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
b481de9c 2757
07bc28ed
GC		 2758 if (num_of_ant(tbl_type.ant_type) == 1) {
2759 lq_cmd->general_params.single_stream_ant_msk =
2760 tbl_type.ant_type;
2761 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2762 lq_cmd->general_params.dual_stream_ant_msk =
2763 tbl_type.ant_type;
2764 } /* otherwise we don't modify the existing value */
b481de9c
ZY		 2765
2766 index++;
1b696de2 2767 repeat_rate--;
b481de9c 2768
aade00ce
GC		 2769 if (priv)
2770 valid_tx_ant = priv->hw_params.valid_tx_ant;
2771
77626355 2772 /* Fill rest of rate table */
b481de9c 2773 while (index < LINK_QUAL_MAX_RETRY_NUM) {
77626355
BC		 2774 /* Repeat initial/next rate.
2775 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2776 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
1b696de2 2777 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
b481de9c 2778 if (is_legacy(tbl_type.lq_type)) {
aade00ce
GC		 2779 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2780 ant_toggle_cnt++;
2781 else if (priv &&
2782 rs_toggle_antenna(valid_tx_ant,
2783 &new_rate, &tbl_type))
2784 ant_toggle_cnt = 1;
2785}
98d7e09a 2786
77626355 2787 /* Override next rate if needed for debug purposes */
c33104f0 2788 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
77626355
BC		 2789
2790 /* Fill next table entry */
b481de9c 2791 lq_cmd->rs_table[index].rate_n_flags =
39e88504 2792 cpu_to_le32(new_rate);
1b696de2 2793 repeat_rate--;
b481de9c
ZY		 2794 index++;
2795 }
2796
39e88504 2797 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
b481de9c
ZY		 2798 &rate_idx);
2799
77626355
BC		 2800 /* Indicate to uCode which entries might be MIMO.
2801 * If initial rate was MIMO, this will finally end up
2802 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
b481de9c
ZY		 2803 if (is_mimo(tbl_type.lq_type))
2804 lq_cmd->general_params.mimo_delimiter = index;
2805
77626355 2806 /* Get next rate */
39e88504
GC		 2807 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2808 use_ht_possible);
b481de9c 2809
77626355 2810 /* How many times should we repeat the next rate? */
b481de9c 2811 if (is_legacy(tbl_type.lq_type)) {
aade00ce
GC		 2812 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2813 ant_toggle_cnt++;
2814 else if (priv &&
2815 rs_toggle_antenna(valid_tx_ant,
2816 &new_rate, &tbl_type))
2817 ant_toggle_cnt = 1;
2818
1b696de2 2819 repeat_rate = IWL_NUMBER_TRY;
aade00ce 2820 } else {
1b696de2 2821 repeat_rate = IWL_HT_NUMBER_TRY;
aade00ce 2822 }
b481de9c 2823
77626355
BC		 2824 /* Don't allow HT rates after next pass.
2825 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
b481de9c
ZY		 2826 use_ht_possible = 0;
2827
77626355 2828 /* Override next rate if needed for debug purposes */
c33104f0 2829 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
77626355
BC		 2830
2831 /* Fill next table entry */
39e88504 2832 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
b481de9c
ZY		 2833
2834 index++;
1b696de2 2835 repeat_rate--;
b481de9c
ZY		 2836 }
2837
13c33a09
WYG		 2838 lq_cmd->agg_params.agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_MAX;
2839 lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2840 lq_cmd->agg_params.agg_time_limit =
2841 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
b481de9c
ZY		 2842}
2843
4b7679a5 2844static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
b481de9c 2845{
4b7679a5 2846 return hw->priv;
b481de9c
ZY		 2847}
2848/* rate scale requires free function to be implemented */
2849static void rs_free(void *priv_rate)
2850{
2851 return;
2852}
2853
4b7679a5
JB		 2854static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
2855 void *priv_sta)
b481de9c 2856{
e227ceac 2857 struct iwl_lq_sta *lq_sta = priv_sta;
45527c2c 2858 struct iwl_priv *priv __maybe_unused = priv_r;
b481de9c 2859
e1623446 2860 IWL_DEBUG_RATE(priv, "enter\n");
c33104f0 2861 kfree(lq_sta);
e1623446 2862 IWL_DEBUG_RATE(priv, "leave\n");
b481de9c
ZY		 2863}
2864
2865
93dc646a 2866#ifdef CONFIG_MAC80211_DEBUGFS
5ae212c9
ZY		 2867static int open_file_generic(struct inode *inode, struct file *file)
2868{
2869 file->private_data = inode->i_private;
2870 return 0;
2871}
e227ceac
TW		 2872static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2873 u32 *rate_n_flags, int index)
98d7e09a 2874{
bf403db8 2875 struct iwl_priv *priv;
3c4955f8
WYG		 2876 u8 valid_tx_ant;
2877 u8 ant_sel_tx;
bf403db8
EK		 2878
2879 priv = lq_sta->drv;
3c4955f8 2880 valid_tx_ant = priv->hw_params.valid_tx_ant;
39e88504 2881 if (lq_sta->dbg_fixed_rate) {
3c4955f8
WYG		 2882 ant_sel_tx =
2883 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
2884 >> RATE_MCS_ANT_POS);
2885 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
39e88504 2886 *rate_n_flags = lq_sta->dbg_fixed_rate;
3c4955f8 2887 IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
39e88504 2888 } else {
3c4955f8
WYG		 2889 lq_sta->dbg_fixed_rate = 0;
2890 IWL_ERR(priv,
2891 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
2892 ant_sel_tx, valid_tx_ant);
2893 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
39e88504 2894 }
39e88504 2895 } else {
e1623446 2896 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
98d7e09a 2897 }
98d7e09a 2898}
5ae212c9 2899
98d7e09a
ZY		 2900static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2901 const char __user *user_buf, size_t count, loff_t *ppos)
2902{
e227ceac 2903 struct iwl_lq_sta *lq_sta = file->private_data;
bf403db8 2904 struct iwl_priv *priv;
98d7e09a
ZY		 2905 char buf[64];
2906 int buf_size;
2907 u32 parsed_rate;
2908
bf403db8 2909 priv = lq_sta->drv;
98d7e09a
ZY		 2910 memset(buf, 0, sizeof(buf));
2911 buf_size = min(count, sizeof(buf) - 1);
2912 if (copy_from_user(buf, user_buf, buf_size))
2913 return -EFAULT;
2914
2915 if (sscanf(buf, "%x", &parsed_rate) == 1)
39e88504 2916 lq_sta->dbg_fixed_rate = parsed_rate;
98d7e09a 2917 else
39e88504 2918 lq_sta->dbg_fixed_rate = 0;
98d7e09a 2919
39e88504
GC		 2920 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2921 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2922 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2923 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
98d7e09a 2924
e1623446 2925 IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
39e88504 2926 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
98d7e09a 2927
39e88504 2928 if (lq_sta->dbg_fixed_rate) {
07bc28ed 2929 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
66c73db7 2930 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
98d7e09a
ZY		 2931 }
2932
2933 return count;
2934}
0209dc11 2935
5ae212c9
ZY		 2936static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2937 char __user *user_buf, size_t count, loff_t *ppos)
2938{
a412c804 2939 char *buff;
5ae212c9
ZY		 2940 int desc = 0;
2941 int i = 0;
12b96817 2942 int index = 0;
a412c804 2943 ssize_t ret;
5ae212c9 2944
e227ceac 2945 struct iwl_lq_sta *lq_sta = file->private_data;
d8ae4f52 2946 struct iwl_priv *priv;
adb7b5e6 2947 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
5ae212c9 2948
d8ae4f52 2949 priv = lq_sta->drv;
a412c804
FS		 2950 buff = kmalloc(1024, GFP_KERNEL);
2951 if (!buff)
2952 return -ENOMEM;
2953
c33104f0 2954 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
98d7e09a 2955 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
c33104f0 2956 lq_sta->total_failed, lq_sta->total_success,
39e88504 2957 lq_sta->active_legacy_rate);
98d7e09a 2958 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
39e88504 2959 lq_sta->dbg_fixed_rate);
d8ae4f52
WYG		 2960 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
2961 (priv->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
2962 (priv->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
2963 (priv->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
adb7b5e6
WYG		 2964 desc += sprintf(buff+desc, "lq type %s\n",
2965 (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
2966 if (is_Ht(tbl->lq_type)) {
2967 desc += sprintf(buff+desc, " %s",
2968 (is_siso(tbl->lq_type)) ? "SISO" :
2969 ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
2970 desc += sprintf(buff+desc, " %s",
7aafef1c 2971 (tbl->is_ht40) ? "40MHz" : "20MHz");
2681b20b
WYG		 2972 desc += sprintf(buff+desc, " %s %s\n", (tbl->is_SGI) ? "SGI" : "",
2973 (lq_sta->is_green) ? "GF enabled" : "");
adb7b5e6 2974 }
12b96817
WYG		 2975 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
2976 lq_sta->last_rate_n_flags);
5ae212c9
ZY		 2977 desc += sprintf(buff+desc, "general:"
2978 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
c33104f0
TW		 2979 lq_sta->lq.general_params.flags,
2980 lq_sta->lq.general_params.mimo_delimiter,
2981 lq_sta->lq.general_params.single_stream_ant_msk,
2982 lq_sta->lq.general_params.dual_stream_ant_msk);
5ae212c9
ZY		 2983
2984 desc += sprintf(buff+desc, "agg:"
2985 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
c33104f0
TW		 2986 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2987 lq_sta->lq.agg_params.agg_dis_start_th,
2988 lq_sta->lq.agg_params.agg_frame_cnt_limit);
5ae212c9
ZY		 2989
2990 desc += sprintf(buff+desc,
2991 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
c33104f0
TW		 2992 lq_sta->lq.general_params.start_rate_index[0],
2993 lq_sta->lq.general_params.start_rate_index[1],
2994 lq_sta->lq.general_params.start_rate_index[2],
2995 lq_sta->lq.general_params.start_rate_index[3]);
5ae212c9 2996
12b96817
WYG		 2997 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2998 index = iwl_hwrate_to_plcp_idx(
2999 le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
3000 if (is_legacy(tbl->lq_type)) {
3001 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
3002 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3003 iwl_rate_mcs[index].mbps);
3004 } else {
3005 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
3006 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3007 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
3008 }
3009 }
5ae212c9 3010
a412c804
FS		 3011 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3012 kfree(buff);
3013 return ret;
5ae212c9
ZY		 3014}
3015
3016static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
98d7e09a 3017 .write = rs_sta_dbgfs_scale_table_write,
5ae212c9
ZY		 3018 .read = rs_sta_dbgfs_scale_table_read,
3019 .open = open_file_generic,
3020};
0209dc11
ZY		 3021static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3022 char __user *user_buf, size_t count, loff_t *ppos)
3023{
a412c804 3024 char *buff;
0209dc11
ZY		 3025 int desc = 0;
3026 int i, j;
a412c804 3027 ssize_t ret;
0209dc11 3028
e227ceac 3029 struct iwl_lq_sta *lq_sta = file->private_data;
a412c804
FS		 3030
3031 buff = kmalloc(1024, GFP_KERNEL);
3032 if (!buff)
3033 return -ENOMEM;
3034
0209dc11 3035 for (i = 0; i < LQ_SIZE; i++) {
7aafef1c
WYG		 3036 desc += sprintf(buff+desc,
3037 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
0209dc11 3038 "rate=0x%X\n",
c3056065 3039 lq_sta->active_tbl == i ? "*" : "x",
c33104f0
TW		 3040 lq_sta->lq_info[i].lq_type,
3041 lq_sta->lq_info[i].is_SGI,
7aafef1c 3042 lq_sta->lq_info[i].is_ht40,
c33104f0 3043 lq_sta->lq_info[i].is_dup,
2681b20b 3044 lq_sta->is_green,
39e88504 3045 lq_sta->lq_info[i].current_rate);
0209dc11
ZY		 3046 for (j = 0; j < IWL_RATE_COUNT; j++) {
3047 desc += sprintf(buff+desc,
c33104f0
TW		 3048 "counter=%d success=%d %%=%d\n",
3049 lq_sta->lq_info[i].win[j].counter,
3050 lq_sta->lq_info[i].win[j].success_counter,
3051 lq_sta->lq_info[i].win[j].success_ratio);
0209dc11
ZY		 3052 }
3053 }
a412c804
FS		 3054 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3055 kfree(buff);
3056 return ret;
0209dc11
ZY		 3057}
3058
3059static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3060 .read = rs_sta_dbgfs_stats_table_read,
3061 .open = open_file_generic,
3062};
5ae212c9 3063
38167459
WYG		 3064static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3065 char __user *user_buf, size_t count, loff_t *ppos)
3066{
3067 char buff[120];
3068 int desc = 0;
3069 ssize_t ret;
3070
3071 struct iwl_lq_sta *lq_sta = file->private_data;
3072 struct iwl_priv *priv;
3073 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3074
3075 priv = lq_sta->drv;
3076
3077 if (is_Ht(tbl->lq_type))
3078 desc += sprintf(buff+desc,
3079 "Bit Rate= %d Mb/s\n",
3080 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3081 else
3082 desc += sprintf(buff+desc,
3083 "Bit Rate= %d Mb/s\n",
3084 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3085 desc += sprintf(buff+desc,
3086 "Signal Level= %d dBm\tNoise Level= %d dBm\n",
3087 priv->last_rx_rssi, priv->last_rx_noise);
3088 desc += sprintf(buff+desc,
3089 "Tsf= 0x%llx\tBeacon time= 0x%08X\n",
3090 priv->last_tsf, priv->last_beacon_time);
3091
3092 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3093 return ret;
3094}
3095
3096static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3097 .read = rs_sta_dbgfs_rate_scale_data_read,
3098 .open = open_file_generic,
3099};
3100
93dc646a
ZY		 3101static void rs_add_debugfs(void *priv, void *priv_sta,
3102 struct dentry *dir)
3103{
e227ceac 3104 struct iwl_lq_sta *lq_sta = priv_sta;
c33104f0 3105 lq_sta->rs_sta_dbgfs_scale_table_file =
0209dc11 3106 debugfs_create_file("rate_scale_table", 0600, dir,
c33104f0
TW		 3107 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3108 lq_sta->rs_sta_dbgfs_stats_table_file =
0209dc11 3109 debugfs_create_file("rate_stats_table", 0600, dir,
c33104f0 3110 lq_sta, &rs_sta_dbgfs_stats_table_ops);
38167459
WYG		 3111 lq_sta->rs_sta_dbgfs_rate_scale_data_file =
3112 debugfs_create_file("rate_scale_data", 0600, dir,
3113 lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
0c11b4de
RR		 3114 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
3115 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
3116 &lq_sta->tx_agg_tid_en);
0c11b4de 3117
93dc646a
ZY		 3118}
3119
3120static void rs_remove_debugfs(void *priv, void *priv_sta)
3121{
e227ceac 3122 struct iwl_lq_sta *lq_sta = priv_sta;
c33104f0
TW		 3123 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3124 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
38167459 3125 debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
0c11b4de 3126 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
93dc646a
ZY		 3127}
3128#endif
3129
b481de9c
ZY		 3130static struct rate_control_ops rs_ops = {
3131 .module = NULL,
3132 .name = RS_NAME,
3133 .tx_status = rs_tx_status,
3134 .get_rate = rs_get_rate,
3135 .rate_init = rs_rate_init,
b481de9c
ZY		 3136 .alloc = rs_alloc,
3137 .free = rs_free,
3138 .alloc_sta = rs_alloc_sta,
3139 .free_sta = rs_free_sta,
93dc646a
ZY		 3140#ifdef CONFIG_MAC80211_DEBUGFS
3141 .add_sta_debugfs = rs_add_debugfs,
3142 .remove_sta_debugfs = rs_remove_debugfs,
3143#endif
b481de9c
ZY		 3144};
3145
e227ceac 3146int iwlagn_rate_control_register(void)
b481de9c 3147{
897e1cf2 3148 return ieee80211_rate_control_register(&rs_ops);
b481de9c
ZY		 3149}
3150
e227ceac 3151void iwlagn_rate_control_unregister(void)
b481de9c
ZY		 3152{
3153 ieee80211_rate_control_unregister(&rs_ops);
3154}
3155
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