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iwlwifi: handle the case when set power fail
[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
RR		 334
335 tl = &lq_data->load[tid];
336
337 curr_time -= curr_time % TID_ROUND_VALUE;
338
339 /* Happens only for the first packet. Initialize the data */
340 if (!(tl->queue_count)) {
341 tl->total = 1;
342 tl->time_stamp = curr_time;
343 tl->queue_count = 1;
344 tl->head = 0;
345 tl->packet_count[0] = 1;
faa29718 346 return MAX_TID_COUNT;
0c11b4de
RR		 347 }
348
349 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
350 index = time_diff / TID_QUEUE_CELL_SPACING;
351
352 /* The history is too long: remove data that is older than */
353 /* TID_MAX_TIME_DIFF */
354 if (index >= TID_QUEUE_MAX_SIZE)
355 rs_tl_rm_old_stats(tl, curr_time);
356
357 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
358 tl->packet_count[index] = tl->packet_count[index] + 1;
359 tl->total = tl->total + 1;
360
361 if ((index + 1) > tl->queue_count)
362 tl->queue_count = index + 1;
faa29718
RR		 363
364 return tid;
0c11b4de
RR		 365}
366
367/*
368 get the traffic load value for tid
369*/
e227ceac 370static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
0c11b4de
RR		 371{
372 u32 curr_time = jiffies_to_msecs(jiffies);
373 u32 time_diff;
374 s32 index;
e227ceac 375 struct iwl_traffic_load *tl = NULL;
0c11b4de
RR		 376
377 if (tid >= TID_MAX_LOAD_COUNT)
378 return 0;
379
380 tl = &(lq_data->load[tid]);
381
382 curr_time -= curr_time % TID_ROUND_VALUE;
383
384 if (!(tl->queue_count))
385 return 0;
386
387 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
388 index = time_diff / TID_QUEUE_CELL_SPACING;
389
390 /* The history is too long: remove data that is older than */
391 /* TID_MAX_TIME_DIFF */
392 if (index >= TID_QUEUE_MAX_SIZE)
393 rs_tl_rm_old_stats(tl, curr_time);
394
395 return tl->total;
396}
397
c79dd5b5 398static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
e227ceac 399 struct iwl_lq_sta *lq_data, u8 tid,
4b7679a5 400 struct ieee80211_sta *sta)
0c11b4de 401{
ff550cb4 402 if (rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
e1623446 403 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
e174961c 404 sta->addr, tid);
4b7679a5 405 ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
0c11b4de
RR		 406 }
407}
408
c79dd5b5 409static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
e227ceac 410 struct iwl_lq_sta *lq_data,
4b7679a5 411 struct ieee80211_sta *sta)
0c11b4de
RR		 412{
413 if ((tid < TID_MAX_LOAD_COUNT))
414 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
415 else if (tid == IWL_AGG_ALL_TID)
416 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
417 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
418}
419
39e88504 420static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
fde0db31 421{
3ac7f146
TW		 422 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
423 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
424 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
fde0db31
GC		 425}
426
77626355
BC		 427/**
428 * rs_collect_tx_data - Update the success/failure sliding window
429 *
430 * We keep a sliding window of the last 62 packets transmitted
431 * at this rate. window->data contains the bitmask of successful
432 * packets.
433 */
e227ceac 434static int rs_collect_tx_data(struct iwl_rate_scale_data *windows,
99556438
RR		 435 int scale_index, s32 tpt, int retries,
436 int successes)
b481de9c 437{
e227ceac 438 struct iwl_rate_scale_data *window = NULL;
39e88504 439 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
b481de9c
ZY		 440 s32 fail_count;
441
dc2453ae
TW		 442 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
443 return -EINVAL;
b481de9c 444
77626355 445 /* Select data for current tx bit rate */
b481de9c
ZY		 446 window = &(windows[scale_index]);
447
77626355
BC		 448 /*
449 * Keep track of only the latest 62 tx frame attempts in this rate's
450 * history window; anything older isn't really relevant any more.
451 * If we have filled up the sliding window, drop the oldest attempt;
452 * if the oldest attempt (highest bit in bitmap) shows "success",
453 * subtract "1" from the success counter (this is the main reason
454 * we keep these bitmaps!).
455 */
99556438 456 while (retries > 0) {
39e88504
GC		 457 if (window->counter >= IWL_RATE_MAX_WINDOW) {
458
459 /* remove earliest */
460 window->counter = IWL_RATE_MAX_WINDOW - 1;
461
99556438
RR		 462 if (window->data & mask) {
463 window->data &= ~mask;
39e88504 464 window->success_counter--;
99556438 465 }
b481de9c 466 }
b481de9c 467
99556438
RR		 468 /* Increment frames-attempted counter */
469 window->counter++;
470
471 /* Shift bitmap by one frame (throw away oldest history),
472 * OR in "1", and increment "success" if this
473 * frame was successful. */
90d7795e 474 window->data <<= 1;
99556438 475 if (successes > 0) {
39e88504 476 window->success_counter++;
99556438
RR		 477 window->data |= 0x1;
478 successes--;
479 }
77626355 480
99556438 481 retries--;
b481de9c
ZY		 482 }
483
77626355 484 /* Calculate current success ratio, avoid divide-by-0! */
b481de9c
ZY		 485 if (window->counter > 0)
486 window->success_ratio = 128 * (100 * window->success_counter)
487 / window->counter;
488 else
489 window->success_ratio = IWL_INVALID_VALUE;
490
491 fail_count = window->counter - window->success_counter;
492
77626355 493 /* Calculate average throughput, if we have enough history. */
b481de9c
ZY		 494 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
495 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
496 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
497 else
498 window->average_tpt = IWL_INVALID_VALUE;
499
77626355 500 /* Tag this window as having been updated */
b481de9c
ZY		 501 window->stamp = jiffies;
502
dc2453ae 503 return 0;
b481de9c
ZY		 504}
505
77626355
BC		 506/*
507 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
508 */
39e88504 509/* FIXME:RS:remove this function and put the flags statically in the table */
978785a3
TW		 510static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
511 struct iwl_scale_tbl_info *tbl,
512 int index, u8 use_green)
b481de9c 513{
39e88504
GC		 514 u32 rate_n_flags = 0;
515
b481de9c 516 if (is_legacy(tbl->lq_type)) {
1826dcc0 517 rate_n_flags = iwl_rates[index].plcp;
b481de9c 518 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
39e88504 519 rate_n_flags |= RATE_MCS_CCK_MSK;
b481de9c 520
fde0db31
GC		 521 } else if (is_Ht(tbl->lq_type)) {
522 if (index > IWL_LAST_OFDM_RATE) {
978785a3 523 IWL_ERR(priv, "Invalid HT rate index %d\n", index);
b481de9c 524 index = IWL_LAST_OFDM_RATE;
fde0db31 525 }
39e88504 526 rate_n_flags = RATE_MCS_HT_MSK;
fde0db31
GC		 527
528 if (is_siso(tbl->lq_type))
1826dcc0 529 rate_n_flags |= iwl_rates[index].plcp_siso;
fde0db31 530 else if (is_mimo2(tbl->lq_type))
1826dcc0 531 rate_n_flags |= iwl_rates[index].plcp_mimo2;
fde0db31 532 else
1826dcc0 533 rate_n_flags |= iwl_rates[index].plcp_mimo3;
b481de9c 534 } else {
978785a3 535 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
b481de9c
ZY		 536 }
537
39e88504 538 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
fde0db31 539 RATE_MCS_ANT_ABC_MSK);
b481de9c 540
39e88504 541 if (is_Ht(tbl->lq_type)) {
7aafef1c 542 if (tbl->is_ht40) {
39e88504
GC		 543 if (tbl->is_dup)
544 rate_n_flags |= RATE_MCS_DUP_MSK;
545 else
7aafef1c 546 rate_n_flags |= RATE_MCS_HT40_MSK;
39e88504
GC		 547 }
548 if (tbl->is_SGI)
549 rate_n_flags |= RATE_MCS_SGI_MSK;
550
551 if (use_green) {
552 rate_n_flags |= RATE_MCS_GF_MSK;
553 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
554 rate_n_flags &= ~RATE_MCS_SGI_MSK;
978785a3 555 IWL_ERR(priv, "GF was set with SGI:SISO\n");
39e88504
GC		 556 }
557 }
b481de9c 558 }
39e88504 559 return rate_n_flags;
b481de9c
ZY		 560}
561
77626355
BC		 562/*
563 * Interpret uCode API's rate_n_flags format,
564 * fill "search" or "active" tx mode table.
565 */
39e88504 566static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
8318d78a 567 enum ieee80211_band band,
e227ceac 568 struct iwl_scale_tbl_info *tbl,
b481de9c
ZY		 569 int *rate_idx)
570{
39e88504
GC		 571 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
572 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
573 u8 mcs;
b481de9c 574
e7d326ac 575 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
b481de9c 576
fde0db31 577 if (*rate_idx == IWL_RATE_INVALID) {
b481de9c 578 *rate_idx = -1;
dc2453ae 579 return -EINVAL;
b481de9c 580 }
77626355 581 tbl->is_SGI = 0; /* default legacy setup */
7aafef1c 582 tbl->is_ht40 = 0;
b481de9c 583 tbl->is_dup = 0;
fde0db31
GC		 584 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
585 tbl->lq_type = LQ_NONE;
d6e93399 586 tbl->max_search = IWL_MAX_SEARCH;
b481de9c 587
77626355 588 /* legacy rate format */
39e88504 589 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
fde0db31 590 if (num_of_ant == 1) {
8318d78a 591 if (band == IEEE80211_BAND_5GHZ)
b481de9c
ZY		 592 tbl->lq_type = LQ_A;
593 else
594 tbl->lq_type = LQ_G;
b481de9c 595 }
fde0db31 596 /* HT rate format */
b481de9c 597 } else {
39e88504 598 if (rate_n_flags & RATE_MCS_SGI_MSK)
b481de9c
ZY		 599 tbl->is_SGI = 1;
600
7aafef1c 601 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
39e88504 602 (rate_n_flags & RATE_MCS_DUP_MSK))
7aafef1c 603 tbl->is_ht40 = 1;
b481de9c 604
39e88504 605 if (rate_n_flags & RATE_MCS_DUP_MSK)
b481de9c 606 tbl->is_dup = 1;
fde0db31 607
39e88504 608 mcs = rs_extract_rate(rate_n_flags);
fde0db31 609
39e88504
GC		 610 /* SISO */
611 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
fde0db31
GC		 612 if (num_of_ant == 1)
613 tbl->lq_type = LQ_SISO; /*else NONE*/
614 /* MIMO2 */
39e88504 615 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
fde0db31
GC		 616 if (num_of_ant == 2)
617 tbl->lq_type = LQ_MIMO2;
618 /* MIMO3 */
619 } else {
d6e93399
MA		 620 if (num_of_ant == 3) {
621 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
fde0db31 622 tbl->lq_type = LQ_MIMO3;
d6e93399 623 }
fde0db31 624 }
b481de9c
ZY		 625 }
626 return 0;
627}
aade00ce
GC		 628
629/* switch to another antenna/antennas and return 1 */
630/* if no other valid antenna found, return 0 */
631static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
e227ceac 632 struct iwl_scale_tbl_info *tbl)
b481de9c 633{
aade00ce
GC		 634 u8 new_ant_type;
635
636 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
637 return 0;
638
639 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
640 return 0;
641
642 new_ant_type = ant_toggle_lookup[tbl->ant_type];
643
644 while ((new_ant_type != tbl->ant_type) &&
645 !rs_is_valid_ant(valid_ant, new_ant_type))
646 new_ant_type = ant_toggle_lookup[new_ant_type];
647
648 if (new_ant_type == tbl->ant_type)
649 return 0;
650
651 tbl->ant_type = new_ant_type;
652 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
653 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
654 return 1;
b481de9c
ZY		 655}
656
2681b20b
WYG		 657/* in 4965 we don't use greenfield at all */
658static inline u8 rs_use_green(struct iwl_priv *priv,
659 struct ieee80211_conf *conf)
b481de9c 660{
2681b20b
WYG		 661 u8 is_green;
662
663 if ((priv->hw_rev & CSR_HW_REV_TYPE_MSK) == CSR_HW_REV_TYPE_4965)
664 is_green = 0;
665 else
666 is_green = (conf_is_ht(conf) &&
667 priv->current_ht_config.is_green_field &&
668 !priv->current_ht_config.non_GF_STA_present);
669 return is_green;
b481de9c
ZY		 670}
671
672/**
673 * rs_get_supported_rates - get the available rates
674 *
675 * if management frame or broadcast frame only return
676 * basic available rates.
677 *
678 */
e227ceac
TW		 679static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
680 struct ieee80211_hdr *hdr,
681 enum iwl_table_type rate_type)
b481de9c 682{
eecd6e57
GC		 683 if (hdr && is_multicast_ether_addr(hdr->addr1) &&
684 lq_sta->active_rate_basic)
685 return lq_sta->active_rate_basic;
686
687 if (is_legacy(rate_type)) {
688 return lq_sta->active_legacy_rate;
689 } else {
b481de9c 690 if (is_siso(rate_type))
eecd6e57 691 return lq_sta->active_siso_rate;
fde0db31 692 else if (is_mimo2(rate_type))
eecd6e57 693 return lq_sta->active_mimo2_rate;
b481de9c 694 else
eecd6e57 695 return lq_sta->active_mimo3_rate;
c33104f0 696 }
b481de9c
ZY		 697}
698
bf403db8
EK		 699static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
700 int rate_type)
b481de9c
ZY		 701{
702 u8 high = IWL_RATE_INVALID;
703 u8 low = IWL_RATE_INVALID;
704
01ebd063 705 /* 802.11A or ht walks to the next literal adjacent rate in
b481de9c
ZY		 706 * the rate table */
707 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
708 int i;
709 u32 mask;
710
711 /* Find the previous rate that is in the rate mask */
712 i = index - 1;
713 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
714 if (rate_mask & mask) {
715 low = i;
716 break;
717 }
718 }
719
720 /* Find the next rate that is in the rate mask */
721 i = index + 1;
722 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
723 if (rate_mask & mask) {
724 high = i;
725 break;
726 }
727 }
728
729 return (high << 8) | low;
730 }
731
732 low = index;
733 while (low != IWL_RATE_INVALID) {
1826dcc0 734 low = iwl_rates[low].prev_rs;
b481de9c
ZY		 735 if (low == IWL_RATE_INVALID)
736 break;
737 if (rate_mask & (1 << low))
738 break;
e1623446 739 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
b481de9c
ZY		 740 }
741
742 high = index;
743 while (high != IWL_RATE_INVALID) {
1826dcc0 744 high = iwl_rates[high].next_rs;
b481de9c
ZY		 745 if (high == IWL_RATE_INVALID)
746 break;
747 if (rate_mask & (1 << high))
748 break;
e1623446 749 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
b481de9c
ZY		 750 }
751
752 return (high << 8) | low;
753}
754
e227ceac
TW		 755static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
756 struct iwl_scale_tbl_info *tbl,
757 u8 scale_index, u8 ht_possible)
b481de9c 758{
b481de9c
ZY		 759 s32 low;
760 u16 rate_mask;
761 u16 high_low;
762 u8 switch_to_legacy = 0;
c33104f0 763 u8 is_green = lq_sta->is_green;
b481de9c
ZY		 764
765 /* check if we need to switch from HT to legacy rates.
766 * assumption is that mandatory rates (1Mbps or 6Mbps)
767 * are always supported (spec demand) */
768 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
769 switch_to_legacy = 1;
770 scale_index = rs_ht_to_legacy[scale_index];
8318d78a 771 if (lq_sta->band == IEEE80211_BAND_5GHZ)
b481de9c
ZY		 772 tbl->lq_type = LQ_A;
773 else
774 tbl->lq_type = LQ_G;
775
69fdb309 776 if (num_of_ant(tbl->ant_type) > 1)
fde0db31 777 tbl->ant_type = ANT_A;/*FIXME:RS*/
b481de9c 778
7aafef1c 779 tbl->is_ht40 = 0;
b481de9c 780 tbl->is_SGI = 0;
d6e93399 781 tbl->max_search = IWL_MAX_SEARCH;
b481de9c
ZY		 782 }
783
eecd6e57 784 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
b481de9c 785
77626355 786 /* Mask with station rate restriction */
b481de9c 787 if (is_legacy(tbl->lq_type)) {
77626355 788 /* supp_rates has no CCK bits in A mode */
8318d78a 789 if (lq_sta->band == IEEE80211_BAND_5GHZ)
b481de9c 790 rate_mask = (u16)(rate_mask &
c33104f0 791 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
b481de9c 792 else
c33104f0 793 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
b481de9c
ZY		 794 }
795
77626355 796 /* If we switched from HT to legacy, check current rate */
dc2453ae 797 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
39e88504
GC		 798 low = scale_index;
799 goto out;
b481de9c
ZY		 800 }
801
bf403db8
EK		 802 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
803 tbl->lq_type);
b481de9c
ZY		 804 low = high_low & 0xff;
805
39e88504
GC		 806 if (low == IWL_RATE_INVALID)
807 low = scale_index;
808
809out:
978785a3 810 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
b481de9c
ZY		 811}
812
77626355
BC		 813/*
814 * mac80211 sends us Tx status
815 */
4b7679a5
JB		 816static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
817 struct ieee80211_sta *sta, void *priv_sta,
e039fa4a 818 struct sk_buff *skb)
b481de9c
ZY		 819{
820 int status;
821 u8 retries;
822 int rs_index, index = 0;
417f114b 823 struct iwl_lq_sta *lq_sta = priv_sta;
66c73db7 824 struct iwl_link_quality_cmd *table;
b481de9c 825 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
4b7679a5
JB		 826 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
827 struct ieee80211_hw *hw = priv->hw;
e039fa4a 828 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
e227ceac
TW		 829 struct iwl_rate_scale_data *window = NULL;
830 struct iwl_rate_scale_data *search_win = NULL;
39e88504 831 u32 tx_rate;
e227ceac
TW		 832 struct iwl_scale_tbl_info tbl_type;
833 struct iwl_scale_tbl_info *curr_tbl, *search_tbl;
b481de9c 834 u8 active_index = 0;
b481de9c
ZY		 835 s32 tpt = 0;
836
e1623446 837 IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
b481de9c 838
417f114b 839 if (!ieee80211_is_data(hdr->frame_control) ||
514d65c1 840 info->flags & IEEE80211_TX_CTL_NO_ACK)
b481de9c
ZY		 841 return;
842
99556438 843 /* This packet was aggregated but doesn't carry rate scale info */
e039fa4a
JB		 844 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
845 !(info->flags & IEEE80211_TX_STAT_AMPDU))
99556438
RR		 846 return;
847
8fe72311
WYG		 848 if (info->flags & IEEE80211_TX_STAT_AMPDU)
849 retries = 0;
850 else
851 retries = info->status.rates[0].count - 1;
b481de9c
ZY		 852
853 if (retries > 15)
854 retries = 15;
855
05c914fe 856 if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
c33104f0 857 !lq_sta->ibss_sta_added)
f4d6082d 858 goto out;
b481de9c 859
c33104f0
TW		 860 table = &lq_sta->lq;
861 active_index = lq_sta->active_tbl;
b481de9c 862
c33104f0
TW		 863 curr_tbl = &(lq_sta->lq_info[active_index]);
864 search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
e227ceac
TW		 865 window = (struct iwl_rate_scale_data *)&(curr_tbl->win[0]);
866 search_win = (struct iwl_rate_scale_data *)&(search_tbl->win[0]);
b481de9c 867
77626355
BC		 868 /*
869 * Ignore this Tx frame response if its initial rate doesn't match
870 * that of latest Link Quality command. There may be stragglers
871 * from a previous Link Quality command, but we're no longer interested
872 * in those; they're either from the "active" mode while we're trying
873 * to check "search" mode, or a prior "search" mode after we've moved
874 * to a new "search" mode (which might become the new "active" mode).
875 */
39e88504
GC		 876 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
877 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
4c424e4c
RR		 878 if (priv->band == IEEE80211_BAND_5GHZ)
879 rs_index -= IWL_FIRST_OFDM_RATE;
880
e6a9854b
JB		 881 if ((info->status.rates[0].idx < 0) ||
882 (tbl_type.is_SGI != !!(info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)) ||
7aafef1c 883 (tbl_type.is_ht40 != !!(info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
e6a9854b
JB		 884 (tbl_type.is_dup != !!(info->status.rates[0].flags & IEEE80211_TX_RC_DUP_DATA)) ||
885 (tbl_type.ant_type != info->antenna_sel_tx) ||
886 (!!(tx_rate & RATE_MCS_HT_MSK) != !!(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) ||
887 (!!(tx_rate & RATE_MCS_GF_MSK) != !!(info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
4c424e4c 888 (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
e6a9854b 889 hw->wiphy->bands[info->band]->bitrates[info->status.rates[0].idx].bitrate)) {
e1623446 890 IWL_DEBUG_RATE(priv, "initial rate does not match 0x%x\n", tx_rate);
d5e49036
MA		 891 /* the last LQ command could failed so the LQ in ucode not
892 * the same in driver sync up
893 */
7d049e5a
AM		 894 lq_sta->missed_rate_counter++;
895 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
896 lq_sta->missed_rate_counter = 0;
897 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
898 }
f4d6082d 899 goto out;
b481de9c
ZY		 900 }
901
7d049e5a 902 lq_sta->missed_rate_counter = 0;
77626355 903 /* Update frame history window with "failure" for each Tx retry. */
b481de9c 904 while (retries) {
77626355
BC		 905 /* Look up the rate and other info used for each tx attempt.
906 * Each tx attempt steps one entry deeper in the rate table. */
39e88504
GC		 907 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
908 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
b481de9c
ZY		 909 &tbl_type, &rs_index);
910
77626355
BC		 911 /* If type matches "search" table,
912 * add failure to "search" history */
b481de9c 913 if ((tbl_type.lq_type == search_tbl->lq_type) &&
fde0db31 914 (tbl_type.ant_type == search_tbl->ant_type) &&
b481de9c
ZY		 915 (tbl_type.is_SGI == search_tbl->is_SGI)) {
916 if (search_tbl->expected_tpt)
917 tpt = search_tbl->expected_tpt[rs_index];
918 else
919 tpt = 0;
99556438 920 rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
77626355
BC		 921
922 /* Else if type matches "current/active" table,
923 * add failure to "current/active" history */
b481de9c 924 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
fde0db31 925 (tbl_type.ant_type == curr_tbl->ant_type) &&
b481de9c
ZY		 926 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
927 if (curr_tbl->expected_tpt)
928 tpt = curr_tbl->expected_tpt[rs_index];
929 else
930 tpt = 0;
99556438 931 rs_collect_tx_data(window, rs_index, tpt, 1, 0);
b481de9c 932 }
77626355
BC		 933
934 /* If not searching for a new mode, increment failed counter
935 * ... this helps determine when to start searching again */
c33104f0
TW		 936 if (lq_sta->stay_in_tbl)
937 lq_sta->total_failed++;
b481de9c
ZY		 938 --retries;
939 index++;
940
941 }
942
77626355
BC		 943 /*
944 * Find (by rate) the history window to update with final Tx attempt;
945 * if Tx was successful first try, use original rate,
946 * else look up the rate that was, finally, successful.
947 */
39e88504 948 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
12b96817 949 lq_sta->last_rate_n_flags = tx_rate;
39e88504 950 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
b481de9c 951
77626355 952 /* Update frame history window with "success" if Tx got ACKed ... */
e039fa4a 953 status = !!(info->flags & IEEE80211_TX_STAT_ACK);
b481de9c 954
77626355
BC		 955 /* If type matches "search" table,
956 * add final tx status to "search" history */
b481de9c 957 if ((tbl_type.lq_type == search_tbl->lq_type) &&
fde0db31 958 (tbl_type.ant_type == search_tbl->ant_type) &&
b481de9c
ZY		 959 (tbl_type.is_SGI == search_tbl->is_SGI)) {
960 if (search_tbl->expected_tpt)
961 tpt = search_tbl->expected_tpt[rs_index];
962 else
963 tpt = 0;
df36c044 964 if (info->flags & IEEE80211_TX_STAT_AMPDU)
99556438 965 rs_collect_tx_data(search_win, rs_index, tpt,
e039fa4a
JB		 966 info->status.ampdu_ack_len,
967 info->status.ampdu_ack_map);
99556438
RR		 968 else
969 rs_collect_tx_data(search_win, rs_index, tpt,
970 1, status);
77626355
BC		 971 /* Else if type matches "current/active" table,
972 * add final tx status to "current/active" history */
b481de9c 973 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
fde0db31 974 (tbl_type.ant_type == curr_tbl->ant_type) &&
b481de9c
ZY		 975 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
976 if (curr_tbl->expected_tpt)
977 tpt = curr_tbl->expected_tpt[rs_index];
978 else
979 tpt = 0;
df36c044 980 if (info->flags & IEEE80211_TX_STAT_AMPDU)
99556438 981 rs_collect_tx_data(window, rs_index, tpt,
e039fa4a
JB		 982 info->status.ampdu_ack_len,
983 info->status.ampdu_ack_map);
99556438
RR		 984 else
985 rs_collect_tx_data(window, rs_index, tpt,
986 1, status);
b481de9c
ZY		 987 }
988
77626355
BC		 989 /* If not searching for new mode, increment success/failed counter
990 * ... these help determine when to start searching again */
c33104f0 991 if (lq_sta->stay_in_tbl) {
df36c044 992 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
e039fa4a 993 lq_sta->total_success += info->status.ampdu_ack_map;
99556438 994 lq_sta->total_failed +=
e039fa4a 995 (info->status.ampdu_ack_len - info->status.ampdu_ack_map);
99556438
RR		 996 } else {
997 if (status)
998 lq_sta->total_success++;
999 else
1000 lq_sta->total_failed++;
1001 }
b481de9c
ZY		 1002 }
1003
77626355 1004 /* See if there's a better rate or modulation mode to try. */
c338ba3c 1005 if (sta && sta->supp_rates[sband->band])
514d65c1 1006 rs_rate_scale_perform(priv, skb, sta, lq_sta);
f4d6082d 1007out:
b481de9c
ZY		 1008 return;
1009}
1010
77626355
BC		 1011/*
1012 * Begin a period of staying with a selected modulation mode.
1013 * Set "stay_in_tbl" flag to prevent any mode switches.
1014 * Set frame tx success limits according to legacy vs. high-throughput,
1015 * and reset overall (spanning all rates) tx success history statistics.
1016 * These control how long we stay using same modulation mode before
1017 * searching for a new mode.
1018 */
bf403db8 1019static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
e227ceac 1020 struct iwl_lq_sta *lq_sta)
b481de9c 1021{
e1623446 1022 IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
c33104f0 1023 lq_sta->stay_in_tbl = 1; /* only place this gets set */
b481de9c 1024 if (is_legacy) {
c33104f0
TW		 1025 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1026 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1027 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
b481de9c 1028 } else {
c33104f0
TW		 1029 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1030 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1031 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
b481de9c 1032 }
c33104f0
TW		 1033 lq_sta->table_count = 0;
1034 lq_sta->total_failed = 0;
1035 lq_sta->total_success = 0;
447fee70 1036 lq_sta->flush_timer = jiffies;
d6e93399 1037 lq_sta->action_counter = 0;
b481de9c
ZY		 1038}
1039
77626355
BC		 1040/*
1041 * Find correct throughput table for given mode of modulation
1042 */
e227ceac
TW		 1043static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1044 struct iwl_scale_tbl_info *tbl)
b481de9c
ZY		 1045{
1046 if (is_legacy(tbl->lq_type)) {
1047 if (!is_a_band(tbl->lq_type))
1048 tbl->expected_tpt = expected_tpt_G;
1049 else
1050 tbl->expected_tpt = expected_tpt_A;
1051 } else if (is_siso(tbl->lq_type)) {
7aafef1c 1052 if (tbl->is_ht40 && !lq_sta->is_dup)
b481de9c
ZY		 1053 if (tbl->is_SGI)
1054 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
1055 else
1056 tbl->expected_tpt = expected_tpt_siso40MHz;
1057 else if (tbl->is_SGI)
1058 tbl->expected_tpt = expected_tpt_siso20MHzSGI;
1059 else
1060 tbl->expected_tpt = expected_tpt_siso20MHz;
584a0f00 1061 } else if (is_mimo2(tbl->lq_type)) {
7aafef1c 1062 if (tbl->is_ht40 && !lq_sta->is_dup)
584a0f00
WYG		 1063 if (tbl->is_SGI)
1064 tbl->expected_tpt = expected_tpt_mimo2_40MHzSGI;
1065 else
1066 tbl->expected_tpt = expected_tpt_mimo2_40MHz;
1067 else if (tbl->is_SGI)
1068 tbl->expected_tpt = expected_tpt_mimo2_20MHzSGI;
1069 else
1070 tbl->expected_tpt = expected_tpt_mimo2_20MHz;
1071 } else if (is_mimo3(tbl->lq_type)) {
7aafef1c 1072 if (tbl->is_ht40 && !lq_sta->is_dup)
b481de9c 1073 if (tbl->is_SGI)
584a0f00 1074 tbl->expected_tpt = expected_tpt_mimo3_40MHzSGI;
b481de9c 1075 else
584a0f00 1076 tbl->expected_tpt = expected_tpt_mimo3_40MHz;
b481de9c 1077 else if (tbl->is_SGI)
584a0f00 1078 tbl->expected_tpt = expected_tpt_mimo3_20MHzSGI;
b481de9c 1079 else
584a0f00 1080 tbl->expected_tpt = expected_tpt_mimo3_20MHz;
b481de9c
ZY		 1081 } else
1082 tbl->expected_tpt = expected_tpt_G;
1083}
1084
77626355
BC		 1085/*
1086 * Find starting rate for new "search" high-throughput mode of modulation.
1087 * Goal is to find lowest expected rate (under perfect conditions) that is
1088 * above the current measured throughput of "active" mode, to give new mode
1089 * a fair chance to prove itself without too many challenges.
1090 *
1091 * This gets called when transitioning to more aggressive modulation
1092 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1093 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1094 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1095 * bit rate will typically need to increase, but not if performance was bad.
1096 */
c79dd5b5 1097static s32 rs_get_best_rate(struct iwl_priv *priv,
e227ceac
TW		 1098 struct iwl_lq_sta *lq_sta,
1099 struct iwl_scale_tbl_info *tbl, /* "search" */
f935a6da 1100 u16 rate_mask, s8 index)
b481de9c 1101{
77626355 1102 /* "active" values */
e227ceac 1103 struct iwl_scale_tbl_info *active_tbl =
c33104f0 1104 &(lq_sta->lq_info[lq_sta->active_tbl]);
b481de9c 1105 s32 active_sr = active_tbl->win[index].success_ratio;
b481de9c 1106 s32 active_tpt = active_tbl->expected_tpt[index];
77626355
BC		 1107
1108 /* expected "search" throughput */
1109 s32 *tpt_tbl = tbl->expected_tpt;
1110
1111 s32 new_rate, high, low, start_hi;
b481de9c 1112 u16 high_low;
f935a6da 1113 s8 rate = index;
b481de9c
ZY		 1114
1115 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1116
1117 for (; ;) {
bf403db8
EK		 1118 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1119 tbl->lq_type);
b481de9c
ZY		 1120
1121 low = high_low & 0xff;
1122 high = (high_low >> 8) & 0xff;
1123
77626355
BC		 1124 /*
1125 * Lower the "search" bit rate, to give new "search" mode
1126 * approximately the same throughput as "active" if:
1127 *
1128 * 1) "Active" mode has been working modestly well (but not
1129 * great), and expected "search" throughput (under perfect
1130 * conditions) at candidate rate is above the actual
1131 * measured "active" throughput (but less than expected
1132 * "active" throughput under perfect conditions).
1133 * OR
1134 * 2) "Active" mode has been working perfectly or very well
1135 * and expected "search" throughput (under perfect
1136 * conditions) at candidate rate is above expected
1137 * "active" throughput (under perfect conditions).
1138 */
c33104f0 1139 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
b481de9c
ZY		 1140 ((active_sr > IWL_RATE_DECREASE_TH) &&
1141 (active_sr <= IWL_RATE_HIGH_TH) &&
1142 (tpt_tbl[rate] <= active_tpt))) ||
1143 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1144 (tpt_tbl[rate] > active_tpt))) {
1145
77626355
BC		 1146 /* (2nd or later pass)
1147 * If we've already tried to raise the rate, and are
1148 * now trying to lower it, use the higher rate. */
b481de9c
ZY		 1149 if (start_hi != IWL_RATE_INVALID) {
1150 new_rate = start_hi;
1151 break;
1152 }
77626355 1153
b481de9c 1154 new_rate = rate;
77626355
BC		 1155
1156 /* Loop again with lower rate */
b481de9c
ZY		 1157 if (low != IWL_RATE_INVALID)
1158 rate = low;
77626355
BC		 1159
1160 /* Lower rate not available, use the original */
b481de9c
ZY		 1161 else
1162 break;
77626355
BC		 1163
1164 /* Else try to raise the "search" rate to match "active" */
b481de9c 1165 } else {
77626355
BC		 1166 /* (2nd or later pass)
1167 * If we've already tried to lower the rate, and are
1168 * now trying to raise it, use the lower rate. */
b481de9c
ZY		 1169 if (new_rate != IWL_RATE_INVALID)
1170 break;
77626355
BC		 1171
1172 /* Loop again with higher rate */
b481de9c
ZY		 1173 else if (high != IWL_RATE_INVALID) {
1174 start_hi = high;
1175 rate = high;
77626355
BC		 1176
1177 /* Higher rate not available, use the original */
b481de9c 1178 } else {
90d7795e 1179 new_rate = rate;
b481de9c
ZY		 1180 break;
1181 }
1182 }
1183 }
1184
1185 return new_rate;
1186}
b481de9c 1187
77626355 1188/*
584a0f00 1189 * Set up search table for MIMO2
77626355 1190 */
fde0db31 1191static int rs_switch_to_mimo2(struct iwl_priv *priv,
e227ceac 1192 struct iwl_lq_sta *lq_sta,
270243a5 1193 struct ieee80211_conf *conf,
4b7679a5 1194 struct ieee80211_sta *sta,
e227ceac 1195 struct iwl_scale_tbl_info *tbl, int index)
b481de9c 1196{
b481de9c
ZY		 1197 u16 rate_mask;
1198 s32 rate;
c33104f0 1199 s8 is_green = lq_sta->is_green;
b481de9c 1200
de27e64e 1201 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
b481de9c
ZY		 1202 return -1;
1203
d9fe60de 1204 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
00c5ae2f 1205 == WLAN_HT_CAP_SM_PS_STATIC)
b481de9c
ZY		 1206 return -1;
1207
77626355 1208 /* Need both Tx chains/antennas to support MIMO */
aade00ce 1209 if (priv->hw_params.tx_chains_num < 2)
b481de9c
ZY		 1210 return -1;
1211
e1623446 1212 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
39e88504
GC		 1213
1214 tbl->lq_type = LQ_MIMO2;
c33104f0 1215 tbl->is_dup = lq_sta->is_dup;
b481de9c 1216 tbl->action = 0;
d6e93399 1217 tbl->max_search = IWL_MAX_SEARCH;
39e88504
GC		 1218 rate_mask = lq_sta->active_mimo2_rate;
1219
7aafef1c
WYG		 1220 if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1221 tbl->is_ht40 = 1;
b481de9c 1222 else
7aafef1c 1223 tbl->is_ht40 = 0;
b481de9c 1224
39e88504 1225 /* FIXME: - don't toggle SGI here
7aafef1c 1226 if (tbl->is_ht40) {
270243a5 1227 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
b481de9c
ZY		 1228 tbl->is_SGI = 1;
1229 else
1230 tbl->is_SGI = 0;
270243a5 1231 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
b481de9c
ZY		 1232 tbl->is_SGI = 1;
1233 else
1234 tbl->is_SGI = 0;
39e88504 1235 */
b481de9c 1236
eecd6e57 1237 rs_set_expected_tpt_table(lq_sta, tbl);
b481de9c 1238
f935a6da 1239 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
b481de9c 1240
e1623446 1241 IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
584a0f00
WYG		 1242 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1243 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1244 rate, rate_mask);
1245 return -1;
1246 }
1247 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1248
1249 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1250 tbl->current_rate, is_green);
1251 return 0;
1252}
1253
1254/*
1255 * Set up search table for MIMO3
1256 */
1257static int rs_switch_to_mimo3(struct iwl_priv *priv,
1258 struct iwl_lq_sta *lq_sta,
1259 struct ieee80211_conf *conf,
1260 struct ieee80211_sta *sta,
1261 struct iwl_scale_tbl_info *tbl, int index)
1262{
1263 u16 rate_mask;
1264 s32 rate;
1265 s8 is_green = lq_sta->is_green;
1266
1267 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1268 return -1;
1269
1270 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1271 == WLAN_HT_CAP_SM_PS_STATIC)
1272 return -1;
1273
1274 /* Need both Tx chains/antennas to support MIMO */
1275 if (priv->hw_params.tx_chains_num < 3)
1276 return -1;
1277
1278 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1279
1280 tbl->lq_type = LQ_MIMO3;
1281 tbl->is_dup = lq_sta->is_dup;
1282 tbl->action = 0;
d6e93399 1283 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
584a0f00
WYG		 1284 rate_mask = lq_sta->active_mimo3_rate;
1285
7aafef1c
WYG		 1286 if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1287 tbl->is_ht40 = 1;
584a0f00 1288 else
7aafef1c 1289 tbl->is_ht40 = 0;
39e88504 1290
584a0f00 1291 /* FIXME: - don't toggle SGI here
7aafef1c 1292 if (tbl->is_ht40) {
584a0f00
WYG		 1293 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1294 tbl->is_SGI = 1;
1295 else
1296 tbl->is_SGI = 0;
1297 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1298 tbl->is_SGI = 1;
1299 else
1300 tbl->is_SGI = 0;
1301 */
1302
1303 rs_set_expected_tpt_table(lq_sta, tbl);
1304
1305 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1306
1307 IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1308 rate, rate_mask);
39e88504 1309 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
e1623446 1310 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
39e88504 1311 rate, rate_mask);
b481de9c 1312 return -1;
39e88504 1313 }
978785a3 1314 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
b481de9c 1315
e1623446 1316 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
39e88504 1317 tbl->current_rate, is_green);
dc2453ae 1318 return 0;
fde0db31 1319}
b481de9c 1320
77626355
BC		 1321/*
1322 * Set up search table for SISO
1323 */
c79dd5b5 1324static int rs_switch_to_siso(struct iwl_priv *priv,
e227ceac 1325 struct iwl_lq_sta *lq_sta,
270243a5 1326 struct ieee80211_conf *conf,
4b7679a5 1327 struct ieee80211_sta *sta,
e227ceac 1328 struct iwl_scale_tbl_info *tbl, int index)
b481de9c 1329{
b481de9c 1330 u16 rate_mask;
c33104f0 1331 u8 is_green = lq_sta->is_green;
b481de9c
ZY		 1332 s32 rate;
1333
de27e64e 1334 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
b481de9c
ZY		 1335 return -1;
1336
e1623446 1337 IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
39e88504 1338
c33104f0 1339 tbl->is_dup = lq_sta->is_dup;
b481de9c
ZY		 1340 tbl->lq_type = LQ_SISO;
1341 tbl->action = 0;
d6e93399 1342 tbl->max_search = IWL_MAX_SEARCH;
39e88504 1343 rate_mask = lq_sta->active_siso_rate;
b481de9c 1344
7aafef1c
WYG		 1345 if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1346 tbl->is_ht40 = 1;
b481de9c 1347 else
7aafef1c 1348 tbl->is_ht40 = 0;
b481de9c 1349
39e88504 1350 /* FIXME: - don't toggle SGI here
7aafef1c 1351 if (tbl->is_ht40) {
270243a5 1352 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
b481de9c
ZY		 1353 tbl->is_SGI = 1;
1354 else
1355 tbl->is_SGI = 0;
270243a5 1356 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
b481de9c
ZY		 1357 tbl->is_SGI = 1;
1358 else
1359 tbl->is_SGI = 0;
39e88504 1360 */
b481de9c
ZY		 1361
1362 if (is_green)
39e88504 1363 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
b481de9c 1364
eecd6e57 1365 rs_set_expected_tpt_table(lq_sta, tbl);
f935a6da 1366 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
b481de9c 1367
e1623446 1368 IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
b481de9c 1369 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
e1623446 1370 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
b481de9c
ZY		 1371 rate, rate_mask);
1372 return -1;
1373 }
978785a3 1374 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
e1623446 1375 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
39e88504 1376 tbl->current_rate, is_green);
403ab56b 1377 return 0;
b481de9c
ZY		 1378}
1379
77626355
BC		 1380/*
1381 * Try to switch to new modulation mode from legacy
1382 */
c79dd5b5 1383static int rs_move_legacy_other(struct iwl_priv *priv,
e227ceac 1384 struct iwl_lq_sta *lq_sta,
270243a5 1385 struct ieee80211_conf *conf,
4b7679a5 1386 struct ieee80211_sta *sta,
b481de9c
ZY		 1387 int index)
1388{
e227ceac
TW		 1389 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1390 struct iwl_scale_tbl_info *search_tbl =
1391 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1392 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1393 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1394 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
b481de9c 1395 u8 start_action = tbl->action;
fde0db31 1396 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
3110bef7 1397 u8 tx_chains_num = priv->hw_params.tx_chains_num;
fde0db31 1398 int ret = 0;
d6e93399 1399 u8 update_search_tbl_counter = 0;
b481de9c 1400
46f9381a
WYG		 1401 if (!iwl_ht_enabled(priv))
1402 /* stay in Legacy */
1403 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1404 else if (iwl_tx_ant_restriction(priv) == IWL_TX_SINGLE &&
1405 tbl->action > IWL_LEGACY_SWITCH_SISO)
1406 tbl->action = IWL_LEGACY_SWITCH_SISO;
b481de9c 1407 for (; ;) {
d6e93399 1408 lq_sta->action_counter++;
b481de9c 1409 switch (tbl->action) {
3110bef7
GC		 1410 case IWL_LEGACY_SWITCH_ANTENNA1:
1411 case IWL_LEGACY_SWITCH_ANTENNA2:
e1623446 1412 IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
b481de9c 1413
3110bef7
GC		 1414 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1415 tx_chains_num <= 1) ||
1416 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1417 tx_chains_num <= 2))
1418 break;
1419
77626355 1420 /* Don't change antenna if success has been great */
b481de9c
ZY		 1421 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1422 break;
77626355 1423
77626355 1424 /* Set up search table to try other antenna */
b481de9c
ZY		 1425 memcpy(search_tbl, tbl, sz);
1426
aade00ce
GC		 1427 if (rs_toggle_antenna(valid_tx_ant,
1428 &search_tbl->current_rate, search_tbl)) {
d6e93399 1429 update_search_tbl_counter = 1;
3110bef7 1430 rs_set_expected_tpt_table(lq_sta, search_tbl);
aade00ce
GC		 1431 goto out;
1432 }
a5e8b505 1433 break;
b481de9c 1434 case IWL_LEGACY_SWITCH_SISO:
e1623446 1435 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
77626355
BC		 1436
1437 /* Set up search table to try SISO */
b481de9c 1438 memcpy(search_tbl, tbl, sz);
b481de9c 1439 search_tbl->is_SGI = 0;
c33104f0 1440 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
270243a5 1441 search_tbl, index);
dc2453ae 1442 if (!ret) {
c33104f0 1443 lq_sta->action_counter = 0;
b481de9c 1444 goto out;
dc2453ae 1445 }
b481de9c
ZY		 1446
1447 break;
3110bef7
GC		 1448 case IWL_LEGACY_SWITCH_MIMO2_AB:
1449 case IWL_LEGACY_SWITCH_MIMO2_AC:
1450 case IWL_LEGACY_SWITCH_MIMO2_BC:
e1623446 1451 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
77626355
BC		 1452
1453 /* Set up search table to try MIMO */
b481de9c 1454 memcpy(search_tbl, tbl, sz);
b481de9c 1455 search_tbl->is_SGI = 0;
3110bef7
GC		 1456
1457 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1458 search_tbl->ant_type = ANT_AB;
1459 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1460 search_tbl->ant_type = ANT_AC;
1461 else
1462 search_tbl->ant_type = ANT_BC;
1463
1464 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1465 break;
1466
fde0db31 1467 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
270243a5 1468 search_tbl, index);
dc2453ae 1469 if (!ret) {
c33104f0 1470 lq_sta->action_counter = 0;
b481de9c 1471 goto out;
dc2453ae 1472 }
b481de9c 1473 break;
584a0f00
WYG		 1474
1475 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1476 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1477
1478 /* Set up search table to try MIMO3 */
1479 memcpy(search_tbl, tbl, sz);
1480 search_tbl->is_SGI = 0;
1481
1482 search_tbl->ant_type = ANT_ABC;
1483
1484 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1485 break;
1486
1487 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1488 search_tbl, index);
1489 if (!ret) {
1490 lq_sta->action_counter = 0;
1491 goto out;
1492 }
1493 break;
b481de9c
ZY		 1494 }
1495 tbl->action++;
584a0f00 1496 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
3110bef7 1497 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
b481de9c
ZY		 1498
1499 if (tbl->action == start_action)
1500 break;
1501
1502 }
3110bef7 1503 search_tbl->lq_type = LQ_NONE;
b481de9c
ZY		 1504 return 0;
1505
3110bef7
GC		 1506out:
1507 lq_sta->search_better_tbl = 1;
b481de9c 1508 tbl->action++;
584a0f00 1509 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
3110bef7 1510 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
d6e93399
MA		 1511 if (update_search_tbl_counter)
1512 search_tbl->action = tbl->action;
b481de9c
ZY		 1513 return 0;
1514
1515}
1516
77626355
BC		 1517/*
1518 * Try to switch to new modulation mode from SISO
1519 */
c79dd5b5 1520static int rs_move_siso_to_other(struct iwl_priv *priv,
e227ceac 1521 struct iwl_lq_sta *lq_sta,
270243a5 1522 struct ieee80211_conf *conf,
4b7679a5 1523 struct ieee80211_sta *sta, int index)
b481de9c 1524{
c33104f0 1525 u8 is_green = lq_sta->is_green;
e227ceac
TW		 1526 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1527 struct iwl_scale_tbl_info *search_tbl =
1528 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1529 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1530 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1531 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
b481de9c 1532 u8 start_action = tbl->action;
fde0db31 1533 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
3110bef7 1534 u8 tx_chains_num = priv->hw_params.tx_chains_num;
d6e93399 1535 u8 update_search_tbl_counter = 0;
fde0db31 1536 int ret;
b481de9c 1537
46f9381a
WYG		 1538 if (iwl_tx_ant_restriction(priv) == IWL_TX_SINGLE &&
1539 tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1540 /* stay in SISO */
1541 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1542 }
b481de9c 1543 for (;;) {
c33104f0 1544 lq_sta->action_counter++;
b481de9c 1545 switch (tbl->action) {
3110bef7
GC		 1546 case IWL_SISO_SWITCH_ANTENNA1:
1547 case IWL_SISO_SWITCH_ANTENNA2:
e1623446 1548 IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
3110bef7
GC		 1549
1550 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1551 tx_chains_num <= 1) ||
1552 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1553 tx_chains_num <= 2))
1554 break;
1555
b481de9c
ZY		 1556 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1557 break;
b481de9c
ZY		 1558
1559 memcpy(search_tbl, tbl, sz);
aade00ce 1560 if (rs_toggle_antenna(valid_tx_ant,
d6e93399
MA		 1561 &search_tbl->current_rate, search_tbl)) {
1562 update_search_tbl_counter = 1;
aade00ce 1563 goto out;
d6e93399 1564 }
a5e8b505 1565 break;
3110bef7
GC		 1566 case IWL_SISO_SWITCH_MIMO2_AB:
1567 case IWL_SISO_SWITCH_MIMO2_AC:
1568 case IWL_SISO_SWITCH_MIMO2_BC:
e1623446 1569 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
b481de9c 1570 memcpy(search_tbl, tbl, sz);
b481de9c 1571 search_tbl->is_SGI = 0;
3110bef7
GC		 1572
1573 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1574 search_tbl->ant_type = ANT_AB;
1575 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1576 search_tbl->ant_type = ANT_AC;
1577 else
1578 search_tbl->ant_type = ANT_BC;
1579
1580 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1581 break;
1582
fde0db31 1583 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
270243a5 1584 search_tbl, index);
3110bef7 1585 if (!ret)
b481de9c
ZY		 1586 goto out;
1587 break;
1588 case IWL_SISO_SWITCH_GI:
7aafef1c 1589 if (!tbl->is_ht40 &&
a9841013
EG		 1590 !(priv->current_ht_config.sgf &
1591 HT_SHORT_GI_20MHZ))
1592 break;
7aafef1c 1593 if (tbl->is_ht40 &&
a9841013
EG		 1594 !(priv->current_ht_config.sgf &
1595 HT_SHORT_GI_40MHZ))
1596 break;
1597
e1623446 1598 IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
0c11b4de 1599
b481de9c 1600 memcpy(search_tbl, tbl, sz);
39e88504
GC		 1601 if (is_green) {
1602 if (!tbl->is_SGI)
1603 break;
1604 else
15b1687c
WT		 1605 IWL_ERR(priv,
1606 "SGI was set in GF+SISO\n");
b481de9c 1607 }
39e88504 1608 search_tbl->is_SGI = !tbl->is_SGI;
eecd6e57 1609 rs_set_expected_tpt_table(lq_sta, search_tbl);
39e88504
GC		 1610 if (tbl->is_SGI) {
1611 s32 tpt = lq_sta->last_tpt / 100;
1612 if (tpt >= search_tbl->expected_tpt[index])
1613 break;
1614 }
978785a3
TW		 1615 search_tbl->current_rate =
1616 rate_n_flags_from_tbl(priv, search_tbl,
1617 index, is_green);
d6e93399 1618 update_search_tbl_counter = 1;
b481de9c 1619 goto out;
584a0f00
WYG		 1620 case IWL_SISO_SWITCH_MIMO3_ABC:
1621 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1622 memcpy(search_tbl, tbl, sz);
1623 search_tbl->is_SGI = 0;
1624 search_tbl->ant_type = ANT_ABC;
1625
1626 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1627 break;
1628
1629 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1630 search_tbl, index);
1631 if (!ret)
1632 goto out;
1633 break;
b481de9c
ZY		 1634 }
1635 tbl->action++;
584a0f00 1636 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
3110bef7 1637 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
b481de9c
ZY		 1638
1639 if (tbl->action == start_action)
1640 break;
1641 }
3110bef7 1642 search_tbl->lq_type = LQ_NONE;
b481de9c
ZY		 1643 return 0;
1644
1645 out:
3110bef7 1646 lq_sta->search_better_tbl = 1;
b481de9c 1647 tbl->action++;
584a0f00 1648 if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
3110bef7 1649 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
d6e93399
MA		 1650 if (update_search_tbl_counter)
1651 search_tbl->action = tbl->action;
1652
b481de9c
ZY		 1653 return 0;
1654}
1655
77626355 1656/*
584a0f00 1657 * Try to switch to new modulation mode from MIMO2
77626355 1658 */
584a0f00 1659static int rs_move_mimo2_to_other(struct iwl_priv *priv,
e227ceac 1660 struct iwl_lq_sta *lq_sta,
270243a5 1661 struct ieee80211_conf *conf,
4b7679a5 1662 struct ieee80211_sta *sta, int index)
b481de9c 1663{
c33104f0 1664 s8 is_green = lq_sta->is_green;
e227ceac
TW		 1665 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1666 struct iwl_scale_tbl_info *search_tbl =
1667 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
3110bef7 1668 struct iwl_rate_scale_data *window = &(tbl->win[index]);
e227ceac
TW		 1669 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1670 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
b481de9c 1671 u8 start_action = tbl->action;
3110bef7
GC		 1672 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1673 u8 tx_chains_num = priv->hw_params.tx_chains_num;
d6e93399 1674 u8 update_search_tbl_counter = 0;
aade00ce 1675 int ret;
b481de9c 1676
46f9381a
WYG		 1677 if ((iwl_tx_ant_restriction(priv) == IWL_TX_SINGLE) &&
1678 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1679 tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1680 /* switch in SISO */
1681 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1682 }
b481de9c 1683 for (;;) {
c33104f0 1684 lq_sta->action_counter++;
b481de9c 1685 switch (tbl->action) {
3110bef7
GC		 1686 case IWL_MIMO2_SWITCH_ANTENNA1:
1687 case IWL_MIMO2_SWITCH_ANTENNA2:
584a0f00 1688 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
3110bef7
GC		 1689
1690 if (tx_chains_num <= 2)
1691 break;
1692
1693 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1694 break;
1695
1696 memcpy(search_tbl, tbl, sz);
1697 if (rs_toggle_antenna(valid_tx_ant,
d6e93399
MA		 1698 &search_tbl->current_rate, search_tbl)) {
1699 update_search_tbl_counter = 1;
3110bef7 1700 goto out;
d6e93399 1701 }
3110bef7
GC		 1702 break;
1703 case IWL_MIMO2_SWITCH_SISO_A:
1704 case IWL_MIMO2_SWITCH_SISO_B:
1705 case IWL_MIMO2_SWITCH_SISO_C:
e1623446 1706 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
0c11b4de 1707
77626355 1708 /* Set up new search table for SISO */
b481de9c 1709 memcpy(search_tbl, tbl, sz);
39e88504 1710
3110bef7 1711 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
fde0db31 1712 search_tbl->ant_type = ANT_A;
3110bef7 1713 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
fde0db31 1714 search_tbl->ant_type = ANT_B;
3110bef7
GC		 1715 else
1716 search_tbl->ant_type = ANT_C;
1717
1718 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1719 break;
b481de9c 1720
c33104f0 1721 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
270243a5 1722 search_tbl, index);
3110bef7 1723 if (!ret)
b481de9c 1724 goto out;
3110bef7 1725
b481de9c
ZY		 1726 break;
1727
3110bef7 1728 case IWL_MIMO2_SWITCH_GI:
7aafef1c 1729 if (!tbl->is_ht40 &&
a9841013
EG		 1730 !(priv->current_ht_config.sgf &
1731 HT_SHORT_GI_20MHZ))
1732 break;
7aafef1c 1733 if (tbl->is_ht40 &&
a9841013
EG		 1734 !(priv->current_ht_config.sgf &
1735 HT_SHORT_GI_40MHZ))
1736 break;
1737
584a0f00 1738 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
77626355 1739
584a0f00 1740 /* Set up new search table for MIMO2 */
b481de9c 1741 memcpy(search_tbl, tbl, sz);
39e88504 1742 search_tbl->is_SGI = !tbl->is_SGI;
eecd6e57 1743 rs_set_expected_tpt_table(lq_sta, search_tbl);
77626355
BC		 1744 /*
1745 * If active table already uses the fastest possible
1746 * modulation (dual stream with short guard interval),
1747 * and it's working well, there's no need to look
1748 * for a better type of modulation!
1749 */
39e88504 1750 if (tbl->is_SGI) {
c33104f0 1751 s32 tpt = lq_sta->last_tpt / 100;
39e88504
GC		 1752 if (tpt >= search_tbl->expected_tpt[index])
1753 break;
b481de9c 1754 }
978785a3
TW		 1755 search_tbl->current_rate =
1756 rate_n_flags_from_tbl(priv, search_tbl,
1757 index, is_green);
d6e93399 1758 update_search_tbl_counter = 1;
b481de9c
ZY		 1759 goto out;
1760
584a0f00
WYG		 1761 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1762 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1763 memcpy(search_tbl, tbl, sz);
1764 search_tbl->is_SGI = 0;
1765 search_tbl->ant_type = ANT_ABC;
1766
1767 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1768 break;
1769
1770 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1771 search_tbl, index);
1772 if (!ret)
1773 goto out;
1774
1775 break;
b481de9c
ZY		 1776 }
1777 tbl->action++;
584a0f00 1778 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
3110bef7 1779 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
b481de9c
ZY		 1780
1781 if (tbl->action == start_action)
1782 break;
1783 }
3110bef7 1784 search_tbl->lq_type = LQ_NONE;
b481de9c
ZY		 1785 return 0;
1786 out:
3110bef7 1787 lq_sta->search_better_tbl = 1;
b481de9c 1788 tbl->action++;
584a0f00 1789 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
3110bef7 1790 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
d6e93399
MA		 1791 if (update_search_tbl_counter)
1792 search_tbl->action = tbl->action;
1793
b481de9c
ZY		 1794 return 0;
1795
1796}
1797
584a0f00
WYG		 1798/*
1799 * Try to switch to new modulation mode from MIMO3
1800 */
1801static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1802 struct iwl_lq_sta *lq_sta,
1803 struct ieee80211_conf *conf,
1804 struct ieee80211_sta *sta, int index)
1805{
1806 s8 is_green = lq_sta->is_green;
1807 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1808 struct iwl_scale_tbl_info *search_tbl =
1809 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1810 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1811 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1812 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1813 u8 start_action = tbl->action;
1814 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1815 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1816 int ret;
d6e93399 1817 u8 update_search_tbl_counter = 0;
584a0f00 1818
46f9381a
WYG		 1819 if ((iwl_tx_ant_restriction(priv) == IWL_TX_SINGLE) &&
1820 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1821 tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1822 /* switch in SISO */
1823 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1824 }
584a0f00
WYG		 1825 for (;;) {
1826 lq_sta->action_counter++;
1827 switch (tbl->action) {
1828 case IWL_MIMO3_SWITCH_ANTENNA1:
1829 case IWL_MIMO3_SWITCH_ANTENNA2:
1830 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
1831
1832 if (tx_chains_num <= 3)
1833 break;
1834
1835 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1836 break;
1837
1838 memcpy(search_tbl, tbl, sz);
1839 if (rs_toggle_antenna(valid_tx_ant,
1840 &search_tbl->current_rate, search_tbl))
1841 goto out;
1842 break;
1843 case IWL_MIMO3_SWITCH_SISO_A:
1844 case IWL_MIMO3_SWITCH_SISO_B:
1845 case IWL_MIMO3_SWITCH_SISO_C:
1846 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
1847
1848 /* Set up new search table for SISO */
1849 memcpy(search_tbl, tbl, sz);
1850
1851 if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
1852 search_tbl->ant_type = ANT_A;
1853 else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
1854 search_tbl->ant_type = ANT_B;
1855 else
1856 search_tbl->ant_type = ANT_C;
1857
1858 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1859 break;
1860
1861 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1862 search_tbl, index);
1863 if (!ret)
1864 goto out;
1865
1866 break;
1867
1868 case IWL_MIMO3_SWITCH_MIMO2_AB:
1869 case IWL_MIMO3_SWITCH_MIMO2_AC:
1870 case IWL_MIMO3_SWITCH_MIMO2_BC:
1871 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
1872
1873 memcpy(search_tbl, tbl, sz);
1874 search_tbl->is_SGI = 0;
1875 if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
1876 search_tbl->ant_type = ANT_AB;
1877 else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
1878 search_tbl->ant_type = ANT_AC;
1879 else
1880 search_tbl->ant_type = ANT_BC;
1881
1882 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1883 break;
1884
1885 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1886 search_tbl, index);
1887 if (!ret)
1888 goto out;
1889
1890 break;
1891
1892 case IWL_MIMO3_SWITCH_GI:
7aafef1c 1893 if (!tbl->is_ht40 &&
584a0f00
WYG		 1894 !(priv->current_ht_config.sgf &
1895 HT_SHORT_GI_20MHZ))
1896 break;
7aafef1c 1897 if (tbl->is_ht40 &&
584a0f00
WYG		 1898 !(priv->current_ht_config.sgf &
1899 HT_SHORT_GI_40MHZ))
1900 break;
1901
1902 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
1903
1904 /* Set up new search table for MIMO */
1905 memcpy(search_tbl, tbl, sz);
1906 search_tbl->is_SGI = !tbl->is_SGI;
1907 rs_set_expected_tpt_table(lq_sta, search_tbl);
1908 /*
1909 * If active table already uses the fastest possible
1910 * modulation (dual stream with short guard interval),
1911 * and it's working well, there's no need to look
1912 * for a better type of modulation!
1913 */
1914 if (tbl->is_SGI) {
1915 s32 tpt = lq_sta->last_tpt / 100;
1916 if (tpt >= search_tbl->expected_tpt[index])
1917 break;
1918 }
1919 search_tbl->current_rate =
1920 rate_n_flags_from_tbl(priv, search_tbl,
1921 index, is_green);
d6e93399 1922 update_search_tbl_counter = 1;
584a0f00
WYG		 1923 goto out;
1924 }
1925 tbl->action++;
1926 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1927 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1928
1929 if (tbl->action == start_action)
1930 break;
1931 }
1932 search_tbl->lq_type = LQ_NONE;
1933 return 0;
1934 out:
1935 lq_sta->search_better_tbl = 1;
1936 tbl->action++;
1937 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1938 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
d6e93399
MA		 1939 if (update_search_tbl_counter)
1940 search_tbl->action = tbl->action;
1941
584a0f00
WYG		 1942 return 0;
1943
1944}
1945
77626355
BC		 1946/*
1947 * Check whether we should continue using same modulation mode, or
1948 * begin search for a new mode, based on:
1949 * 1) # tx successes or failures while using this mode
1950 * 2) # times calling this function
1951 * 3) elapsed time in this mode (not used, for now)
1952 */
e227ceac 1953static void rs_stay_in_table(struct iwl_lq_sta *lq_sta)
b481de9c 1954{
e227ceac 1955 struct iwl_scale_tbl_info *tbl;
b481de9c
ZY		 1956 int i;
1957 int active_tbl;
1958 int flush_interval_passed = 0;
bf403db8 1959 struct iwl_priv *priv;
b481de9c 1960
bf403db8 1961 priv = lq_sta->drv;
c33104f0 1962 active_tbl = lq_sta->active_tbl;
b481de9c 1963
c33104f0 1964 tbl = &(lq_sta->lq_info[active_tbl]);
b481de9c 1965
77626355 1966 /* If we've been disallowing search, see if we should now allow it */
c33104f0 1967 if (lq_sta->stay_in_tbl) {
b481de9c 1968
77626355 1969 /* Elapsed time using current modulation mode */
c33104f0 1970 if (lq_sta->flush_timer)
b481de9c 1971 flush_interval_passed =
447fee70
MA		 1972 time_after(jiffies,
1973 (unsigned long)(lq_sta->flush_timer +
b481de9c
ZY		 1974 IWL_RATE_SCALE_FLUSH_INTVL));
1975
77626355
BC		 1976 /*
1977 * Check if we should allow search for new modulation mode.
1978 * If many frames have failed or succeeded, or we've used
1979 * this same modulation for a long time, allow search, and
1980 * reset history stats that keep track of whether we should
1981 * allow a new search. Also (below) reset all bitmaps and
1982 * stats in active history.
1983 */
c33104f0
TW		 1984 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1985 (lq_sta->total_success > lq_sta->max_success_limit) ||
1986 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
b481de9c 1987 && (flush_interval_passed))) {
e1623446 1988 IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n:",
c33104f0
TW		 1989 lq_sta->total_failed,
1990 lq_sta->total_success,
b481de9c 1991 flush_interval_passed);
77626355
BC		 1992
1993 /* Allow search for new mode */
c33104f0
TW		 1994 lq_sta->stay_in_tbl = 0; /* only place reset */
1995 lq_sta->total_failed = 0;
1996 lq_sta->total_success = 0;
1997 lq_sta->flush_timer = 0;
77626355
BC		 1998
1999 /*
2000 * Else if we've used this modulation mode enough repetitions
2001 * (regardless of elapsed time or success/failure), reset
2002 * history bitmaps and rate-specific stats for all rates in
2003 * active table.
2004 */
403ab56b 2005 } else {
c33104f0
TW		 2006 lq_sta->table_count++;
2007 if (lq_sta->table_count >=
2008 lq_sta->table_count_limit) {
2009 lq_sta->table_count = 0;
b481de9c 2010
e1623446 2011 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
b481de9c
ZY		 2012 for (i = 0; i < IWL_RATE_COUNT; i++)
2013 rs_rate_scale_clear_window(
2014 &(tbl->win[i]));
2015 }
2016 }
2017
77626355
BC		 2018 /* If transitioning to allow "search", reset all history
2019 * bitmaps and stats in active table (this will become the new
2020 * "search" table). */
c33104f0 2021 if (!lq_sta->stay_in_tbl) {
b481de9c
ZY		 2022 for (i = 0; i < IWL_RATE_COUNT; i++)
2023 rs_rate_scale_clear_window(&(tbl->win[i]));
2024 }
2025 }
2026}
2027
e3139fe7
WYG		 2028/*
2029 * setup rate table in uCode
2030 * return rate_n_flags as used in the table
2031 */
2032static u32 rs_update_rate_tbl(struct iwl_priv *priv,
2033 struct iwl_lq_sta *lq_sta,
2034 struct iwl_scale_tbl_info *tbl,
2035 int index, u8 is_green)
2036{
2037 u32 rate;
2038
2039 /* Update uCode's rate table. */
2040 rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2041 rs_fill_link_cmd(priv, lq_sta, rate);
2042 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2043
2044 return rate;
2045}
2046
77626355
BC		 2047/*
2048 * Do rate scaling and search for new modulation mode.
2049 */
c79dd5b5 2050static void rs_rate_scale_perform(struct iwl_priv *priv,
514d65c1 2051 struct sk_buff *skb,
4b7679a5
JB		 2052 struct ieee80211_sta *sta,
2053 struct iwl_lq_sta *lq_sta)
b481de9c 2054{
4b7679a5 2055 struct ieee80211_hw *hw = priv->hw;
270243a5 2056 struct ieee80211_conf *conf = &hw->conf;
514d65c1
GS		 2057 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2058 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
b481de9c
ZY		 2059 int low = IWL_RATE_INVALID;
2060 int high = IWL_RATE_INVALID;
2061 int index;
2062 int i;
e227ceac 2063 struct iwl_rate_scale_data *window = NULL;
b481de9c
ZY		 2064 int current_tpt = IWL_INVALID_VALUE;
2065 int low_tpt = IWL_INVALID_VALUE;
2066 int high_tpt = IWL_INVALID_VALUE;
2067 u32 fail_count;
2068 s8 scale_action = 0;
fd7c8a40 2069 u16 rate_mask;
b481de9c 2070 u8 update_lq = 0;
e227ceac 2071 struct iwl_scale_tbl_info *tbl, *tbl1;
b481de9c 2072 u16 rate_scale_index_msk = 0;
39e88504 2073 u32 rate;
b481de9c
ZY		 2074 u8 is_green = 0;
2075 u8 active_tbl = 0;
2076 u8 done_search = 0;
2077 u16 high_low;
a5e8b505 2078 s32 sr;
0c11b4de 2079 u8 tid = MAX_TID_COUNT;
86b4766b 2080 struct iwl_tid_data *tid_data;
b481de9c 2081
e1623446 2082 IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
b481de9c 2083
514d65c1 2084 /* Send management frames and NO_ACK data using lowest rate. */
417f114b
TW		 2085 /* TODO: this could probably be improved.. */
2086 if (!ieee80211_is_data(hdr->frame_control) ||
514d65c1 2087 info->flags & IEEE80211_TX_CTL_NO_ACK)
b481de9c 2088 return;
b481de9c 2089
4b7679a5 2090 if (!sta || !lq_sta)
b481de9c
ZY		 2091 return;
2092
4b7679a5 2093 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
b481de9c 2094
faa29718
RR		 2095 tid = rs_tl_add_packet(lq_sta, hdr);
2096
77626355
BC		 2097 /*
2098 * Select rate-scale / modulation-mode table to work with in
2099 * the rest of this function: "search" if searching for better
2100 * modulation mode, or "active" if doing rate scaling within a mode.
2101 */
c33104f0
TW		 2102 if (!lq_sta->search_better_tbl)
2103 active_tbl = lq_sta->active_tbl;
b481de9c 2104 else
c33104f0 2105 active_tbl = 1 - lq_sta->active_tbl;
b481de9c 2106
c33104f0 2107 tbl = &(lq_sta->lq_info[active_tbl]);
2681b20b
WYG		 2108 if (is_legacy(tbl->lq_type))
2109 lq_sta->is_green = 0;
2110 else
2111 lq_sta->is_green = rs_use_green(priv, conf);
c33104f0 2112 is_green = lq_sta->is_green;
b481de9c 2113
77626355 2114 /* current tx rate */
b7e35008 2115 index = lq_sta->last_txrate_idx;
b481de9c 2116
e1623446 2117 IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
b481de9c
ZY		 2118 tbl->lq_type);
2119
77626355 2120 /* rates available for this association, and for modulation mode */
eecd6e57 2121 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
b481de9c 2122
e1623446 2123 IWL_DEBUG_RATE(priv, "mask 0x%04X \n", rate_mask);
b481de9c
ZY		 2124
2125 /* mask with station rate restriction */
2126 if (is_legacy(tbl->lq_type)) {
8318d78a 2127 if (lq_sta->band == IEEE80211_BAND_5GHZ)
77626355 2128 /* supp_rates has no CCK bits in A mode */
b481de9c 2129 rate_scale_index_msk = (u16) (rate_mask &
c33104f0 2130 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
b481de9c
ZY		 2131 else
2132 rate_scale_index_msk = (u16) (rate_mask &
c33104f0 2133 lq_sta->supp_rates);
b481de9c
ZY		 2134
2135 } else
2136 rate_scale_index_msk = rate_mask;
2137
2138 if (!rate_scale_index_msk)
2139 rate_scale_index_msk = rate_mask;
2140
07bc28ed 2141 if (!((1 << index) & rate_scale_index_msk)) {
15b1687c 2142 IWL_ERR(priv, "Current Rate is not valid\n");
e3139fe7
WYG		 2143 if (lq_sta->search_better_tbl) {
2144 /* revert to active table if search table is not valid*/
2145 tbl->lq_type = LQ_NONE;
2146 lq_sta->search_better_tbl = 0;
2147 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2148 /* get "active" rate info */
2149 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2150 rate = rs_update_rate_tbl(priv, lq_sta,
2151 tbl, index, is_green);
2152 }
07bc28ed 2153 return;
b481de9c
ZY		 2154 }
2155
77626355 2156 /* Get expected throughput table and history window for current rate */
07bc28ed 2157 if (!tbl->expected_tpt) {
15b1687c 2158 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
07bc28ed
GC		 2159 return;
2160 }
b481de9c 2161
c6ec7a9b
AM		 2162 /* force user max rate if set by user */
2163 if ((lq_sta->max_rate_idx != -1) &&
2164 (lq_sta->max_rate_idx < index)) {
2165 index = lq_sta->max_rate_idx;
2166 update_lq = 1;
2167 window = &(tbl->win[index]);
2168 goto lq_update;
2169 }
2170
b481de9c
ZY		 2171 window = &(tbl->win[index]);
2172
77626355
BC		 2173 /*
2174 * If there is not enough history to calculate actual average
2175 * throughput, keep analyzing results of more tx frames, without
2176 * changing rate or mode (bypass most of the rest of this function).
2177 * Set up new rate table in uCode only if old rate is not supported
2178 * in current association (use new rate found above).
2179 */
b481de9c 2180 fail_count = window->counter - window->success_counter;
07bc28ed
GC		 2181 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2182 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
e1623446 2183 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
b481de9c
ZY		 2184 "for index %d\n",
2185 window->success_counter, window->counter, index);
77626355
BC		 2186
2187 /* Can't calculate this yet; not enough history */
b481de9c 2188 window->average_tpt = IWL_INVALID_VALUE;
77626355
BC		 2189
2190 /* Should we stay with this modulation mode,
2191 * or search for a new one? */
c33104f0 2192 rs_stay_in_table(lq_sta);
77626355 2193
b481de9c 2194 goto out;
3110bef7 2195 }
b481de9c 2196
77626355
BC		 2197 /* Else we have enough samples; calculate estimate of
2198 * actual average throughput */
3110bef7
GC		 2199
2200 BUG_ON(window->average_tpt != ((window->success_ratio *
2201 tbl->expected_tpt[index] + 64) / 128));
b481de9c 2202
77626355 2203 /* If we are searching for better modulation mode, check success. */
46f9381a
WYG		 2204 if (lq_sta->search_better_tbl &&
2205 (iwl_tx_ant_restriction(priv) == IWL_TX_MULTI)) {
77626355
BC		 2206 /* If good success, continue using the "search" mode;
2207 * no need to send new link quality command, since we're
2208 * continuing to use the setup that we've been trying. */
07bc28ed
GC		 2209 if (window->average_tpt > lq_sta->last_tpt) {
2210
e1623446 2211 IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
07bc28ed
GC		 2212 "suc=%d cur-tpt=%d old-tpt=%d\n",
2213 window->success_ratio,
2214 window->average_tpt,
2215 lq_sta->last_tpt);
2216
2217 if (!is_legacy(tbl->lq_type))
c33104f0 2218 lq_sta->enable_counter = 1;
07bc28ed 2219
77626355 2220 /* Swap tables; "search" becomes "active" */
c33104f0 2221 lq_sta->active_tbl = active_tbl;
b481de9c 2222 current_tpt = window->average_tpt;
77626355
BC		 2223
2224 /* Else poor success; go back to mode in "active" table */
b481de9c 2225 } else {
07bc28ed 2226
e1623446 2227 IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
07bc28ed
GC		 2228 "suc=%d cur-tpt=%d old-tpt=%d\n",
2229 window->success_ratio,
2230 window->average_tpt,
2231 lq_sta->last_tpt);
2232
77626355 2233 /* Nullify "search" table */
b481de9c 2234 tbl->lq_type = LQ_NONE;
77626355
BC		 2235
2236 /* Revert to "active" table */
c33104f0
TW		 2237 active_tbl = lq_sta->active_tbl;
2238 tbl = &(lq_sta->lq_info[active_tbl]);
b481de9c 2239
77626355 2240 /* Revert to "active" rate and throughput info */
e7d326ac 2241 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
c33104f0 2242 current_tpt = lq_sta->last_tpt;
b481de9c 2243
77626355 2244 /* Need to set up a new rate table in uCode */
b481de9c 2245 update_lq = 1;
b481de9c 2246 }
77626355
BC		 2247
2248 /* Either way, we've made a decision; modulation mode
2249 * search is done, allow rate adjustment next time. */
c33104f0 2250 lq_sta->search_better_tbl = 0;
77626355 2251 done_search = 1; /* Don't switch modes below! */
b481de9c
ZY		 2252 goto lq_update;
2253 }
2254
77626355
BC		 2255 /* (Else) not in search of better modulation mode, try for better
2256 * starting rate, while staying in this mode. */
bf403db8 2257 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
b481de9c
ZY		 2258 tbl->lq_type);
2259 low = high_low & 0xff;
2260 high = (high_low >> 8) & 0xff;
2261
c6ec7a9b
AM		 2262 /* If user set max rate, dont allow higher than user constrain */
2263 if ((lq_sta->max_rate_idx != -1) &&
2264 (lq_sta->max_rate_idx < high))
2265 high = IWL_RATE_INVALID;
2266
a5e8b505
GC		 2267 sr = window->success_ratio;
2268
77626355 2269 /* Collect measured throughputs for current and adjacent rates */
b481de9c 2270 current_tpt = window->average_tpt;
b481de9c
ZY		 2271 if (low != IWL_RATE_INVALID)
2272 low_tpt = tbl->win[low].average_tpt;
b481de9c
ZY		 2273 if (high != IWL_RATE_INVALID)
2274 high_tpt = tbl->win[high].average_tpt;
2275
a5e8b505 2276 scale_action = 0;
b481de9c 2277
77626355 2278 /* Too many failures, decrease rate */
a5e8b505 2279 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
e1623446 2280 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
b481de9c 2281 scale_action = -1;
77626355
BC		 2282
2283 /* No throughput measured yet for adjacent rates; try increase. */
b481de9c 2284 } else if ((low_tpt == IWL_INVALID_VALUE) &&
a5e8b505
GC		 2285 (high_tpt == IWL_INVALID_VALUE)) {
2286
2287 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2288 scale_action = 1;
2289 else if (low != IWL_RATE_INVALID)
8fe72311 2290 scale_action = 0;
a5e8b505 2291 }
77626355
BC		 2292
2293 /* Both adjacent throughputs are measured, but neither one has better
2294 * throughput; we're using the best rate, don't change it! */
b481de9c
ZY		 2295 else if ((low_tpt != IWL_INVALID_VALUE) &&
2296 (high_tpt != IWL_INVALID_VALUE) &&
2297 (low_tpt < current_tpt) &&
2298 (high_tpt < current_tpt))
2299 scale_action = 0;
77626355
BC		 2300
2301 /* At least one adjacent rate's throughput is measured,
2302 * and may have better performance. */
b481de9c 2303 else {
77626355 2304 /* Higher adjacent rate's throughput is measured */
b481de9c 2305 if (high_tpt != IWL_INVALID_VALUE) {
77626355 2306 /* Higher rate has better throughput */
a5e8b505
GC		 2307 if (high_tpt > current_tpt &&
2308 sr >= IWL_RATE_INCREASE_TH) {
b481de9c 2309 scale_action = 1;
a5e8b505 2310 } else {
8fe72311 2311 scale_action = 0;
b481de9c 2312 }
77626355
BC		 2313
2314 /* Lower adjacent rate's throughput is measured */
b481de9c 2315 } else if (low_tpt != IWL_INVALID_VALUE) {
77626355 2316 /* Lower rate has better throughput */
b481de9c 2317 if (low_tpt > current_tpt) {
e1623446
TW		 2318 IWL_DEBUG_RATE(priv,
2319 "decrease rate because of low tpt\n");
b481de9c 2320 scale_action = -1;
a5e8b505 2321 } else if (sr >= IWL_RATE_INCREASE_TH) {
b481de9c 2322 scale_action = 1;
a5e8b505 2323 }
b481de9c
ZY		 2324 }
2325 }
2326
77626355
BC		 2327 /* Sanity check; asked for decrease, but success rate or throughput
2328 * has been good at old rate. Don't change it. */
a5e8b505
GC		 2329 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2330 ((sr > IWL_RATE_HIGH_TH) ||
b481de9c 2331 (current_tpt > (100 * tbl->expected_tpt[low]))))
b481de9c 2332 scale_action = 0;
46f9381a
WYG		 2333 if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2334 scale_action = -1;
2335 if (iwl_tx_ant_restriction(priv) != IWL_TX_MULTI &&
2336 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2337 scale_action = -1;
b481de9c
ZY		 2338 switch (scale_action) {
2339 case -1:
77626355 2340 /* Decrease starting rate, update uCode's rate table */
b481de9c
ZY		 2341 if (low != IWL_RATE_INVALID) {
2342 update_lq = 1;
2343 index = low;
2344 }
447fee70 2345
b481de9c
ZY		 2346 break;
2347 case 1:
77626355 2348 /* Increase starting rate, update uCode's rate table */
b481de9c
ZY		 2349 if (high != IWL_RATE_INVALID) {
2350 update_lq = 1;
2351 index = high;
2352 }
2353
2354 break;
2355 case 0:
77626355 2356 /* No change */
b481de9c
ZY		 2357 default:
2358 break;
2359 }
2360
e1623446 2361 IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
b481de9c
ZY		 2362 "high %d type %d\n",
2363 index, scale_action, low, high, tbl->lq_type);
2364
a5e8b505 2365lq_update:
77626355 2366 /* Replace uCode's rate table for the destination station. */
e3139fe7
WYG		 2367 if (update_lq)
2368 rate = rs_update_rate_tbl(priv, lq_sta,
2369 tbl, index, is_green);
77626355 2370
46f9381a
WYG		 2371 if (iwl_tx_ant_restriction(priv) == IWL_TX_MULTI) {
2372 /* Should we stay with this modulation mode,
2373 * or search for a new one? */
2374 rs_stay_in_table(lq_sta);
2375 }
77626355
BC		 2376 /*
2377 * Search for new modulation mode if we're:
2378 * 1) Not changing rates right now
2379 * 2) Not just finishing up a search
2380 * 3) Allowing a new search
2381 */
47cfd463 2382 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
77626355 2383 /* Save current throughput to compare with "search" throughput*/
c33104f0 2384 lq_sta->last_tpt = current_tpt;
b481de9c 2385
77626355
BC		 2386 /* Select a new "search" modulation mode to try.
2387 * If one is found, set up the new "search" table. */
b481de9c 2388 if (is_legacy(tbl->lq_type))
c33104f0 2389 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
b481de9c 2390 else if (is_siso(tbl->lq_type))
c33104f0 2391 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
584a0f00
WYG		 2392 else if (is_mimo2(tbl->lq_type))
2393 rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
b481de9c 2394 else
584a0f00 2395 rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
b481de9c 2396
77626355 2397 /* If new "search" mode was selected, set up in uCode table */
c33104f0 2398 if (lq_sta->search_better_tbl) {
77626355 2399 /* Access the "search" table, clear its history. */
c33104f0 2400 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
b481de9c
ZY		 2401 for (i = 0; i < IWL_RATE_COUNT; i++)
2402 rs_rate_scale_clear_window(&(tbl->win[i]));
2403
77626355 2404 /* Use new "search" start rate */
e7d326ac 2405 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
b481de9c 2406
e1623446 2407 IWL_DEBUG_RATE(priv, "Switch current mcs: %X index: %d\n",
39e88504 2408 tbl->current_rate, index);
07bc28ed 2409 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
66c73db7 2410 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
447fee70
MA		 2411 } else
2412 done_search = 1;
2413 }
b481de9c 2414
447fee70 2415 if (done_search && !lq_sta->stay_in_tbl) {
77626355
BC		 2416 /* If the "active" (non-search) mode was legacy,
2417 * and we've tried switching antennas,
2418 * but we haven't been able to try HT modes (not available),
2419 * stay with best antenna legacy modulation for a while
2420 * before next round of mode comparisons. */
c33104f0 2421 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
de27e64e 2422 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
d6e93399 2423 lq_sta->action_counter > tbl1->max_search) {
e1623446 2424 IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
bf403db8 2425 rs_set_stay_in_table(priv, 1, lq_sta);
b481de9c
ZY		 2426 }
2427
77626355
BC		 2428 /* If we're in an HT mode, and all 3 mode switch actions
2429 * have been tried and compared, stay in this best modulation
2430 * mode for a while before next round of mode comparisons. */
c33104f0 2431 if (lq_sta->enable_counter &&
46f9381a
WYG		 2432 (lq_sta->action_counter >= tbl1->max_search) &&
2433 iwl_ht_enabled(priv)) {
0c11b4de
RR		 2434 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2435 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2436 (tid != MAX_TID_COUNT)) {
86b4766b
WYG		 2437 tid_data =
2438 &priv->stations[lq_sta->lq.sta_id].tid[tid];
2439 if (tid_data->agg.state == IWL_AGG_OFF) {
2440 IWL_DEBUG_RATE(priv,
2441 "try to aggregate tid %d\n",
2442 tid);
2443 rs_tl_turn_on_agg(priv, tid,
2444 lq_sta, sta);
2445 }
b481de9c 2446 }
bf403db8 2447 rs_set_stay_in_table(priv, 0, lq_sta);
b481de9c 2448 }
b481de9c
ZY		 2449 }
2450
2451out:
978785a3 2452 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
b481de9c 2453 i = index;
b7e35008 2454 lq_sta->last_txrate_idx = i;
b481de9c 2455
b481de9c
ZY		 2456 return;
2457}
2458
2459
c79dd5b5 2460static void rs_initialize_lq(struct iwl_priv *priv,
270243a5 2461 struct ieee80211_conf *conf,
4b7679a5
JB		 2462 struct ieee80211_sta *sta,
2463 struct iwl_lq_sta *lq_sta)
b481de9c 2464{
e227ceac 2465 struct iwl_scale_tbl_info *tbl;
b481de9c 2466 int rate_idx;
aade00ce 2467 int i;
39e88504 2468 u32 rate;
aade00ce
GC		 2469 u8 use_green = rs_use_green(priv, conf);
2470 u8 active_tbl = 0;
2471 u8 valid_tx_ant;
b481de9c 2472
4b7679a5 2473 if (!sta || !lq_sta)
b481de9c
ZY		 2474 goto out;
2475
b7e35008 2476 i = lq_sta->last_txrate_idx;
b481de9c 2477
c33104f0 2478 if ((lq_sta->lq.sta_id == 0xff) &&
05c914fe 2479 (priv->iw_mode == NL80211_IFTYPE_ADHOC))
b481de9c
ZY		 2480 goto out;
2481
aade00ce
GC		 2482 valid_tx_ant = priv->hw_params.valid_tx_ant;
2483
c33104f0
TW		 2484 if (!lq_sta->search_better_tbl)
2485 active_tbl = lq_sta->active_tbl;
b481de9c 2486 else
c33104f0 2487 active_tbl = 1 - lq_sta->active_tbl;
b481de9c 2488
c33104f0 2489 tbl = &(lq_sta->lq_info[active_tbl]);
b481de9c
ZY		 2490
2491 if ((i < 0) || (i >= IWL_RATE_COUNT))
2492 i = 0;
2493
1826dcc0 2494 rate = iwl_rates[i].plcp;
eb48dcaf
WT		 2495 tbl->ant_type = first_antenna(valid_tx_ant);
2496 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
b481de9c
ZY		 2497
2498 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
39e88504 2499 rate |= RATE_MCS_CCK_MSK;
b481de9c 2500
39e88504 2501 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
aade00ce
GC		 2502 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2503 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
b481de9c 2504
978785a3 2505 rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
39e88504 2506 tbl->current_rate = rate;
eecd6e57 2507 rs_set_expected_tpt_table(lq_sta, tbl);
07bc28ed 2508 rs_fill_link_cmd(NULL, lq_sta, rate);
66c73db7 2509 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
b481de9c
ZY		 2510 out:
2511 return;
2512}
2513
e6a9854b
JB		 2514static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2515 struct ieee80211_tx_rate_control *txrc)
b481de9c
ZY		 2516{
2517
e6a9854b
JB		 2518 struct sk_buff *skb = txrc->skb;
2519 struct ieee80211_supported_band *sband = txrc->sband;
4b7679a5
JB		 2520 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2521 struct ieee80211_conf *conf = &priv->hw->conf;
b481de9c 2522 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
e6a9854b 2523 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
417f114b
TW		 2524 struct iwl_lq_sta *lq_sta = priv_sta;
2525 int rate_idx;
b481de9c 2526
e1623446 2527 IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
b481de9c 2528
c6ec7a9b
AM		 2529 /* Get max rate if user set max rate */
2530 if (lq_sta) {
2531 lq_sta->max_rate_idx = txrc->max_rate_idx;
2532 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2533 (lq_sta->max_rate_idx != -1))
2534 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2535 if ((lq_sta->max_rate_idx < 0) ||
2536 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2537 lq_sta->max_rate_idx = -1;
2538 }
2539
514d65c1 2540 /* Send management frames and NO_ACK data using lowest rate. */
4c6d4f5c 2541 if (rate_control_send_low(sta, priv_sta, txrc))
4b7679a5 2542 return;
b481de9c 2543
417f114b 2544 rate_idx = lq_sta->last_txrate_idx;
b481de9c 2545
05c914fe 2546 if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
c33104f0 2547 !lq_sta->ibss_sta_added) {
c587de0b 2548 u8 sta_id = iwl_find_station(priv, hdr->addr1);
b481de9c
ZY		 2549
2550 if (sta_id == IWL_INVALID_STATION) {
e1623446 2551 IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n",
e174961c 2552 hdr->addr1);
c587de0b
TW		 2553 sta_id = iwl_add_station(priv, hdr->addr1,
2554 false, CMD_ASYNC, NULL);
b481de9c
ZY		 2555 }
2556 if ((sta_id != IWL_INVALID_STATION)) {
c33104f0
TW		 2557 lq_sta->lq.sta_id = sta_id;
2558 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2559 lq_sta->ibss_sta_added = 1;
4b7679a5 2560 rs_initialize_lq(priv, conf, sta, lq_sta);
b481de9c 2561 }
b481de9c
ZY		 2562 }
2563
a9c146b3 2564 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
417f114b 2565 rate_idx -= IWL_FIRST_OFDM_RATE;
a9c146b3
WYG		 2566 /* 6M and 9M shared same MCS index */
2567 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2568 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2569 IWL_RATE_MIMO3_6M_PLCP)
2570 rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2571 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2572 IWL_RATE_MIMO2_6M_PLCP)
2573 rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2574 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2575 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2576 info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2577 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2578 info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
7aafef1c 2579 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
a9c146b3
WYG		 2580 info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2581 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2582 info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2583 } else {
2584 if (rate_idx < 0 || rate_idx > IWL_RATE_COUNT)
2585 rate_idx = rate_lowest_index(sband, sta);
2586 else if (sband->band == IEEE80211_BAND_5GHZ)
2587 rate_idx -= IWL_FIRST_OFDM_RATE;
2588 }
417f114b 2589 info->control.rates[0].idx = rate_idx;
a9c146b3 2590
b481de9c
ZY		 2591}
2592
4b7679a5
JB		 2593static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2594 gfp_t gfp)
b481de9c 2595{
e227ceac 2596 struct iwl_lq_sta *lq_sta;
bf403db8 2597 struct iwl_priv *priv;
b481de9c
ZY		 2598 int i, j;
2599
bf403db8 2600 priv = (struct iwl_priv *)priv_rate;
e1623446 2601 IWL_DEBUG_RATE(priv, "create station rate scale window\n");
b481de9c 2602
e227ceac 2603 lq_sta = kzalloc(sizeof(struct iwl_lq_sta), gfp);
b481de9c 2604
c33104f0 2605 if (lq_sta == NULL)
b481de9c 2606 return NULL;
c33104f0 2607 lq_sta->lq.sta_id = 0xff;
b481de9c 2608
63fddb9f 2609
b481de9c
ZY		 2610 for (j = 0; j < LQ_SIZE; j++)
2611 for (i = 0; i < IWL_RATE_COUNT; i++)
3ac7f146 2612 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
b481de9c 2613
c33104f0 2614 return lq_sta;
b481de9c
ZY		 2615}
2616
4b7679a5
JB		 2617static void rs_rate_init(void *priv_r, struct ieee80211_supported_band *sband,
2618 struct ieee80211_sta *sta, void *priv_sta)
b481de9c
ZY		 2619{
2620 int i, j;
4b7679a5
JB		 2621 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2622 struct ieee80211_conf *conf = &priv->hw->conf;
e227ceac 2623 struct iwl_lq_sta *lq_sta = priv_sta;
d5e49036 2624 u16 mask_bit = 0;
7d049e5a
AM		 2625 int count;
2626 int start_rate = 0;
b481de9c 2627
c33104f0 2628 lq_sta->flush_timer = 0;
4b7679a5 2629 lq_sta->supp_rates = sta->supp_rates[sband->band];
b481de9c
ZY		 2630 for (j = 0; j < LQ_SIZE; j++)
2631 for (i = 0; i < IWL_RATE_COUNT; i++)
3ac7f146 2632 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
b481de9c 2633
e1623446 2634 IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init ***\n");
b481de9c
ZY		 2635 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2636 * the lowest or the highest rate.. Could consider using RSSI from
2637 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2638 * after assoc.. */
2639
c33104f0 2640 lq_sta->ibss_sta_added = 0;
05c914fe 2641 if (priv->iw_mode == NL80211_IFTYPE_AP) {
c587de0b 2642 u8 sta_id = iwl_find_station(priv,
e11bc028 2643 sta->addr);
0795af57 2644
b481de9c 2645 /* for IBSS the call are from tasklet */
e1623446 2646 IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n", sta->addr);
b481de9c
ZY		 2647
2648 if (sta_id == IWL_INVALID_STATION) {
e1623446 2649 IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n", sta->addr);
c587de0b
TW		 2650 sta_id = iwl_add_station(priv, sta->addr, false,
2651 CMD_ASYNC, NULL);
b481de9c
ZY		 2652 }
2653 if ((sta_id != IWL_INVALID_STATION)) {
c33104f0
TW		 2654 lq_sta->lq.sta_id = sta_id;
2655 lq_sta->lq.rs_table[0].rate_n_flags = 0;
b481de9c
ZY		 2656 }
2657 /* FIXME: this is w/a remove it later */
2658 priv->assoc_station_added = 1;
2659 }
2660
c33104f0 2661 lq_sta->is_dup = 0;
c6ec7a9b 2662 lq_sta->max_rate_idx = -1;
7d049e5a 2663 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
c33104f0 2664 lq_sta->is_green = rs_use_green(priv, conf);
39e88504 2665 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
c33104f0 2666 lq_sta->active_rate_basic = priv->active_rate_basic;
8318d78a 2667 lq_sta->band = priv->band;
77626355
BC		 2668 /*
2669 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2670 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2671 */
ae5eb026
JB		 2672 lq_sta->active_siso_rate = sta->ht_cap.mcs.rx_mask[0] << 1;
2673 lq_sta->active_siso_rate |= sta->ht_cap.mcs.rx_mask[0] & 0x1;
c33104f0 2674 lq_sta->active_siso_rate &= ~((u16)0x2);
fde0db31 2675 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
b481de9c 2676
77626355 2677 /* Same here */
ae5eb026
JB		 2678 lq_sta->active_mimo2_rate = sta->ht_cap.mcs.rx_mask[1] << 1;
2679 lq_sta->active_mimo2_rate |= sta->ht_cap.mcs.rx_mask[1] & 0x1;
fde0db31
GC		 2680 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2681 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2682
ae5eb026
JB		 2683 lq_sta->active_mimo3_rate = sta->ht_cap.mcs.rx_mask[2] << 1;
2684 lq_sta->active_mimo3_rate |= sta->ht_cap.mcs.rx_mask[2] & 0x1;
fde0db31
GC		 2685 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2686 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2687
e1623446 2688 IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
c33104f0 2689 lq_sta->active_siso_rate,
fde0db31
GC		 2690 lq_sta->active_mimo2_rate,
2691 lq_sta->active_mimo3_rate);
2692
a96a27f9 2693 /* These values will be overridden later */
07bc28ed
GC		 2694 lq_sta->lq.general_params.single_stream_ant_msk = ANT_A;
2695 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2696
0c11b4de
RR		 2697 /* as default allow aggregation for all tids */
2698 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
c33104f0 2699 lq_sta->drv = priv;
b481de9c 2700
d5e49036 2701 /* Find highest tx rate supported by hardware and destination station */
7d049e5a
AM		 2702 mask_bit = sta->supp_rates[sband->band];
2703 count = sband->n_bitrates;
2704 if (sband->band == IEEE80211_BAND_5GHZ) {
2705 count += IWL_FIRST_OFDM_RATE;
2706 start_rate = IWL_FIRST_OFDM_RATE;
2707 mask_bit <<= IWL_FIRST_OFDM_RATE;
2708 }
2709
2710 mask_bit = mask_bit & lq_sta->active_legacy_rate;
2711 lq_sta->last_txrate_idx = 4;
2712 for (i = start_rate; i < count; i++)
d5e49036
MA		 2713 if (mask_bit & BIT(i))
2714 lq_sta->last_txrate_idx = i;
2715
4b7679a5 2716 rs_initialize_lq(priv, conf, sta, lq_sta);
b481de9c
ZY		 2717}
2718
46f9381a 2719static void rs_fill_link_cmd(struct iwl_priv *priv,
e227ceac 2720 struct iwl_lq_sta *lq_sta, u32 new_rate)
b481de9c 2721{
e227ceac 2722 struct iwl_scale_tbl_info tbl_type;
b481de9c 2723 int index = 0;
b481de9c 2724 int rate_idx;
1b696de2 2725 int repeat_rate = 0;
aade00ce 2726 u8 ant_toggle_cnt = 0;
b481de9c 2727 u8 use_ht_possible = 1;
aade00ce 2728 u8 valid_tx_ant = 0;
07bc28ed 2729 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
b481de9c 2730
77626355 2731 /* Override starting rate (index 0) if needed for debug purposes */
39e88504 2732 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
98d7e09a 2733
39e88504 2734 /* Interpret new_rate (rate_n_flags) */
aade00ce 2735 memset(&tbl_type, 0, sizeof(tbl_type));
39e88504 2736 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
b481de9c
ZY		 2737 &tbl_type, &rate_idx);
2738
77626355 2739 /* How many times should we repeat the initial rate? */
b481de9c 2740 if (is_legacy(tbl_type.lq_type)) {
aade00ce 2741 ant_toggle_cnt = 1;
1b696de2 2742 repeat_rate = IWL_NUMBER_TRY;
aade00ce 2743 } else {
1b696de2 2744 repeat_rate = IWL_HT_NUMBER_TRY;
aade00ce 2745 }
b481de9c
ZY		 2746
2747 lq_cmd->general_params.mimo_delimiter =
2748 is_mimo(tbl_type.lq_type) ? 1 : 0;
77626355
BC		 2749
2750 /* Fill 1st table entry (index 0) */
39e88504 2751 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
b481de9c 2752
07bc28ed
GC		 2753 if (num_of_ant(tbl_type.ant_type) == 1) {
2754 lq_cmd->general_params.single_stream_ant_msk =
2755 tbl_type.ant_type;
2756 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2757 lq_cmd->general_params.dual_stream_ant_msk =
2758 tbl_type.ant_type;
2759 } /* otherwise we don't modify the existing value */
b481de9c
ZY		 2760
2761 index++;
1b696de2 2762 repeat_rate--;
b481de9c 2763
aade00ce
GC		 2764 if (priv)
2765 valid_tx_ant = priv->hw_params.valid_tx_ant;
2766
77626355 2767 /* Fill rest of rate table */
b481de9c 2768 while (index < LINK_QUAL_MAX_RETRY_NUM) {
77626355
BC		 2769 /* Repeat initial/next rate.
2770 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2771 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
1b696de2 2772 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
b481de9c 2773 if (is_legacy(tbl_type.lq_type)) {
aade00ce
GC		 2774 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2775 ant_toggle_cnt++;
2776 else if (priv &&
2777 rs_toggle_antenna(valid_tx_ant,
2778 &new_rate, &tbl_type))
2779 ant_toggle_cnt = 1;
2780}
98d7e09a 2781
77626355 2782 /* Override next rate if needed for debug purposes */
c33104f0 2783 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
77626355
BC		 2784
2785 /* Fill next table entry */
b481de9c 2786 lq_cmd->rs_table[index].rate_n_flags =
39e88504 2787 cpu_to_le32(new_rate);
1b696de2 2788 repeat_rate--;
b481de9c
ZY		 2789 index++;
2790 }
2791
39e88504 2792 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
b481de9c
ZY		 2793 &rate_idx);
2794
77626355
BC		 2795 /* Indicate to uCode which entries might be MIMO.
2796 * If initial rate was MIMO, this will finally end up
2797 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
b481de9c
ZY		 2798 if (is_mimo(tbl_type.lq_type))
2799 lq_cmd->general_params.mimo_delimiter = index;
2800
77626355 2801 /* Get next rate */
39e88504
GC		 2802 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2803 use_ht_possible);
b481de9c 2804
77626355 2805 /* How many times should we repeat the next rate? */
b481de9c 2806 if (is_legacy(tbl_type.lq_type)) {
aade00ce
GC		 2807 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2808 ant_toggle_cnt++;
2809 else if (priv &&
2810 rs_toggle_antenna(valid_tx_ant,
2811 &new_rate, &tbl_type))
2812 ant_toggle_cnt = 1;
2813
1b696de2 2814 repeat_rate = IWL_NUMBER_TRY;
aade00ce 2815 } else {
1b696de2 2816 repeat_rate = IWL_HT_NUMBER_TRY;
aade00ce 2817 }
b481de9c 2818
77626355
BC		 2819 /* Don't allow HT rates after next pass.
2820 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
b481de9c
ZY		 2821 use_ht_possible = 0;
2822
77626355 2823 /* Override next rate if needed for debug purposes */
c33104f0 2824 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
77626355
BC		 2825
2826 /* Fill next table entry */
39e88504 2827 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
b481de9c
ZY		 2828
2829 index++;
1b696de2 2830 repeat_rate--;
b481de9c
ZY		 2831 }
2832
13c33a09
WYG		 2833 lq_cmd->agg_params.agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_MAX;
2834 lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2835 lq_cmd->agg_params.agg_time_limit =
2836 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
b481de9c
ZY		 2837}
2838
4b7679a5 2839static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
b481de9c 2840{
4b7679a5 2841 return hw->priv;
b481de9c
ZY		 2842}
2843/* rate scale requires free function to be implemented */
2844static void rs_free(void *priv_rate)
2845{
2846 return;
2847}
2848
4b7679a5
JB		 2849static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
2850 void *priv_sta)
b481de9c 2851{
e227ceac 2852 struct iwl_lq_sta *lq_sta = priv_sta;
45527c2c 2853 struct iwl_priv *priv __maybe_unused = priv_r;
b481de9c 2854
e1623446 2855 IWL_DEBUG_RATE(priv, "enter\n");
c33104f0 2856 kfree(lq_sta);
e1623446 2857 IWL_DEBUG_RATE(priv, "leave\n");
b481de9c
ZY		 2858}
2859
2860
93dc646a 2861#ifdef CONFIG_MAC80211_DEBUGFS
5ae212c9
ZY		 2862static int open_file_generic(struct inode *inode, struct file *file)
2863{
2864 file->private_data = inode->i_private;
2865 return 0;
2866}
e227ceac
TW		 2867static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2868 u32 *rate_n_flags, int index)
98d7e09a 2869{
bf403db8 2870 struct iwl_priv *priv;
3c4955f8
WYG		 2871 u8 valid_tx_ant;
2872 u8 ant_sel_tx;
bf403db8
EK		 2873
2874 priv = lq_sta->drv;
3c4955f8 2875 valid_tx_ant = priv->hw_params.valid_tx_ant;
39e88504 2876 if (lq_sta->dbg_fixed_rate) {
3c4955f8
WYG		 2877 ant_sel_tx =
2878 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
2879 >> RATE_MCS_ANT_POS);
2880 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
39e88504 2881 *rate_n_flags = lq_sta->dbg_fixed_rate;
3c4955f8 2882 IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
39e88504 2883 } else {
3c4955f8
WYG		 2884 lq_sta->dbg_fixed_rate = 0;
2885 IWL_ERR(priv,
2886 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
2887 ant_sel_tx, valid_tx_ant);
2888 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
39e88504 2889 }
39e88504 2890 } else {
e1623446 2891 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
98d7e09a 2892 }
98d7e09a 2893}
5ae212c9 2894
98d7e09a
ZY		 2895static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2896 const char __user *user_buf, size_t count, loff_t *ppos)
2897{
e227ceac 2898 struct iwl_lq_sta *lq_sta = file->private_data;
bf403db8 2899 struct iwl_priv *priv;
98d7e09a
ZY		 2900 char buf[64];
2901 int buf_size;
2902 u32 parsed_rate;
2903
bf403db8 2904 priv = lq_sta->drv;
98d7e09a
ZY		 2905 memset(buf, 0, sizeof(buf));
2906 buf_size = min(count, sizeof(buf) - 1);
2907 if (copy_from_user(buf, user_buf, buf_size))
2908 return -EFAULT;
2909
2910 if (sscanf(buf, "%x", &parsed_rate) == 1)
39e88504 2911 lq_sta->dbg_fixed_rate = parsed_rate;
98d7e09a 2912 else
39e88504 2913 lq_sta->dbg_fixed_rate = 0;
98d7e09a 2914
39e88504
GC		 2915 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2916 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2917 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2918 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
98d7e09a 2919
e1623446 2920 IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
39e88504 2921 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
98d7e09a 2922
39e88504 2923 if (lq_sta->dbg_fixed_rate) {
07bc28ed 2924 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
66c73db7 2925 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
98d7e09a
ZY		 2926 }
2927
2928 return count;
2929}
0209dc11 2930
5ae212c9
ZY		 2931static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2932 char __user *user_buf, size_t count, loff_t *ppos)
2933{
a412c804 2934 char *buff;
5ae212c9
ZY		 2935 int desc = 0;
2936 int i = 0;
12b96817 2937 int index = 0;
a412c804 2938 ssize_t ret;
5ae212c9 2939
e227ceac 2940 struct iwl_lq_sta *lq_sta = file->private_data;
d8ae4f52 2941 struct iwl_priv *priv;
adb7b5e6 2942 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
5ae212c9 2943
d8ae4f52 2944 priv = lq_sta->drv;
a412c804
FS		 2945 buff = kmalloc(1024, GFP_KERNEL);
2946 if (!buff)
2947 return -ENOMEM;
2948
c33104f0 2949 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
98d7e09a 2950 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
c33104f0 2951 lq_sta->total_failed, lq_sta->total_success,
39e88504 2952 lq_sta->active_legacy_rate);
98d7e09a 2953 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
39e88504 2954 lq_sta->dbg_fixed_rate);
d8ae4f52
WYG		 2955 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
2956 (priv->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
2957 (priv->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
2958 (priv->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
adb7b5e6
WYG		 2959 desc += sprintf(buff+desc, "lq type %s\n",
2960 (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
2961 if (is_Ht(tbl->lq_type)) {
2962 desc += sprintf(buff+desc, " %s",
2963 (is_siso(tbl->lq_type)) ? "SISO" :
2964 ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
2965 desc += sprintf(buff+desc, " %s",
7aafef1c 2966 (tbl->is_ht40) ? "40MHz" : "20MHz");
2681b20b
WYG		 2967 desc += sprintf(buff+desc, " %s %s\n", (tbl->is_SGI) ? "SGI" : "",
2968 (lq_sta->is_green) ? "GF enabled" : "");
adb7b5e6 2969 }
12b96817
WYG		 2970 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
2971 lq_sta->last_rate_n_flags);
5ae212c9
ZY		 2972 desc += sprintf(buff+desc, "general:"
2973 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
c33104f0
TW		 2974 lq_sta->lq.general_params.flags,
2975 lq_sta->lq.general_params.mimo_delimiter,
2976 lq_sta->lq.general_params.single_stream_ant_msk,
2977 lq_sta->lq.general_params.dual_stream_ant_msk);
5ae212c9
ZY		 2978
2979 desc += sprintf(buff+desc, "agg:"
2980 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
c33104f0
TW		 2981 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2982 lq_sta->lq.agg_params.agg_dis_start_th,
2983 lq_sta->lq.agg_params.agg_frame_cnt_limit);
5ae212c9
ZY		 2984
2985 desc += sprintf(buff+desc,
2986 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
c33104f0
TW		 2987 lq_sta->lq.general_params.start_rate_index[0],
2988 lq_sta->lq.general_params.start_rate_index[1],
2989 lq_sta->lq.general_params.start_rate_index[2],
2990 lq_sta->lq.general_params.start_rate_index[3]);
5ae212c9 2991
12b96817
WYG		 2992 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2993 index = iwl_hwrate_to_plcp_idx(
2994 le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2995 if (is_legacy(tbl->lq_type)) {
2996 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
2997 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
2998 iwl_rate_mcs[index].mbps);
2999 } else {
3000 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
3001 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3002 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
3003 }
3004 }
5ae212c9 3005
a412c804
FS		 3006 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3007 kfree(buff);
3008 return ret;
5ae212c9
ZY		 3009}
3010
3011static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
98d7e09a 3012 .write = rs_sta_dbgfs_scale_table_write,
5ae212c9
ZY		 3013 .read = rs_sta_dbgfs_scale_table_read,
3014 .open = open_file_generic,
3015};
0209dc11
ZY		 3016static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3017 char __user *user_buf, size_t count, loff_t *ppos)
3018{
a412c804 3019 char *buff;
0209dc11
ZY		 3020 int desc = 0;
3021 int i, j;
a412c804 3022 ssize_t ret;
0209dc11 3023
e227ceac 3024 struct iwl_lq_sta *lq_sta = file->private_data;
a412c804
FS		 3025
3026 buff = kmalloc(1024, GFP_KERNEL);
3027 if (!buff)
3028 return -ENOMEM;
3029
0209dc11 3030 for (i = 0; i < LQ_SIZE; i++) {
7aafef1c
WYG		 3031 desc += sprintf(buff+desc,
3032 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
0209dc11 3033 "rate=0x%X\n",
c3056065 3034 lq_sta->active_tbl == i ? "*" : "x",
c33104f0
TW		 3035 lq_sta->lq_info[i].lq_type,
3036 lq_sta->lq_info[i].is_SGI,
7aafef1c 3037 lq_sta->lq_info[i].is_ht40,
c33104f0 3038 lq_sta->lq_info[i].is_dup,
2681b20b 3039 lq_sta->is_green,
39e88504 3040 lq_sta->lq_info[i].current_rate);
0209dc11
ZY		 3041 for (j = 0; j < IWL_RATE_COUNT; j++) {
3042 desc += sprintf(buff+desc,
c33104f0
TW		 3043 "counter=%d success=%d %%=%d\n",
3044 lq_sta->lq_info[i].win[j].counter,
3045 lq_sta->lq_info[i].win[j].success_counter,
3046 lq_sta->lq_info[i].win[j].success_ratio);
0209dc11
ZY		 3047 }
3048 }
a412c804
FS		 3049 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3050 kfree(buff);
3051 return ret;
0209dc11
ZY		 3052}
3053
3054static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3055 .read = rs_sta_dbgfs_stats_table_read,
3056 .open = open_file_generic,
3057};
5ae212c9 3058
38167459
WYG		 3059static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3060 char __user *user_buf, size_t count, loff_t *ppos)
3061{
3062 char buff[120];
3063 int desc = 0;
3064 ssize_t ret;
3065
3066 struct iwl_lq_sta *lq_sta = file->private_data;
3067 struct iwl_priv *priv;
3068 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3069
3070 priv = lq_sta->drv;
3071
3072 if (is_Ht(tbl->lq_type))
3073 desc += sprintf(buff+desc,
3074 "Bit Rate= %d Mb/s\n",
3075 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3076 else
3077 desc += sprintf(buff+desc,
3078 "Bit Rate= %d Mb/s\n",
3079 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3080 desc += sprintf(buff+desc,
3081 "Signal Level= %d dBm\tNoise Level= %d dBm\n",
3082 priv->last_rx_rssi, priv->last_rx_noise);
3083 desc += sprintf(buff+desc,
3084 "Tsf= 0x%llx\tBeacon time= 0x%08X\n",
3085 priv->last_tsf, priv->last_beacon_time);
3086
3087 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3088 return ret;
3089}
3090
3091static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3092 .read = rs_sta_dbgfs_rate_scale_data_read,
3093 .open = open_file_generic,
3094};
3095
93dc646a
ZY		 3096static void rs_add_debugfs(void *priv, void *priv_sta,
3097 struct dentry *dir)
3098{
e227ceac 3099 struct iwl_lq_sta *lq_sta = priv_sta;
c33104f0 3100 lq_sta->rs_sta_dbgfs_scale_table_file =
0209dc11 3101 debugfs_create_file("rate_scale_table", 0600, dir,
c33104f0
TW		 3102 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3103 lq_sta->rs_sta_dbgfs_stats_table_file =
0209dc11 3104 debugfs_create_file("rate_stats_table", 0600, dir,
c33104f0 3105 lq_sta, &rs_sta_dbgfs_stats_table_ops);
38167459
WYG		 3106 lq_sta->rs_sta_dbgfs_rate_scale_data_file =
3107 debugfs_create_file("rate_scale_data", 0600, dir,
3108 lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
0c11b4de
RR		 3109 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
3110 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
3111 &lq_sta->tx_agg_tid_en);
0c11b4de 3112
93dc646a
ZY		 3113}
3114
3115static void rs_remove_debugfs(void *priv, void *priv_sta)
3116{
e227ceac 3117 struct iwl_lq_sta *lq_sta = priv_sta;
c33104f0
TW		 3118 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3119 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
38167459 3120 debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
0c11b4de 3121 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
93dc646a
ZY		 3122}
3123#endif
3124
b481de9c
ZY		 3125static struct rate_control_ops rs_ops = {
3126 .module = NULL,
3127 .name = RS_NAME,
3128 .tx_status = rs_tx_status,
3129 .get_rate = rs_get_rate,
3130 .rate_init = rs_rate_init,
b481de9c
ZY		 3131 .alloc = rs_alloc,
3132 .free = rs_free,
3133 .alloc_sta = rs_alloc_sta,
3134 .free_sta = rs_free_sta,
93dc646a
ZY		 3135#ifdef CONFIG_MAC80211_DEBUGFS
3136 .add_sta_debugfs = rs_add_debugfs,
3137 .remove_sta_debugfs = rs_remove_debugfs,
3138#endif
b481de9c
ZY		 3139};
3140
e227ceac 3141int iwlagn_rate_control_register(void)
b481de9c 3142{
897e1cf2 3143 return ieee80211_rate_control_register(&rs_ops);
b481de9c
ZY		 3144}
3145
e227ceac 3146void iwlagn_rate_control_unregister(void)
b481de9c
ZY		 3147{
3148 ieee80211_rate_control_unregister(&rs_ops);
3149}
3150
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