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iwlwifi: rate sacaling fixes
[linux-2.6-block.git] / drivers / net / wireless / iwlwifi / iwl-4965-rs.c
CommitLineData
b481de9c
ZY		 1/******************************************************************************
2 *
eb7ae89c 3 * Copyright(c) 2005 - 2008 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:
22 * James P. Ketrenos <ipw2100-admin@linux.intel.com>
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
2c8dccc7 38#include "../net/mac80211/rate.h"
b481de9c 39
5d08cd1d 40#include "iwl-4965.h"
857485c0 41#include "iwl-core.h"
b481de9c
ZY		 42#include "iwl-helpers.h"
43
44#define RS_NAME "iwl-4965-rs"
45
aade00ce 46#define NUM_TRY_BEFORE_ANT_TOGGLE 1
b481de9c
ZY		 47#define IWL_NUMBER_TRY 1
48#define IWL_HT_NUMBER_TRY 3
49
77626355
BC		 50#define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
51#define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
52#define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
53
54/* max time to accum history 2 seconds */
55#define IWL_RATE_SCALE_FLUSH_INTVL (2*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
BC		 78/**
79 * struct iwl4965_rate_scale_data -- tx success history for one rate
80 */
bb8c093b 81struct iwl4965_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
BC		 90/**
91 * struct iwl4965_scale_tbl_info -- tx params and success history for all rates
92 *
0c11b4de 93 * There are two of these in struct iwl4965_lq_sta,
77626355
BC		 94 * one for "active", and one for "search".
95 */
bb8c093b 96struct iwl4965_scale_tbl_info {
fde0db31
GC		 97 enum iwl_table_type lq_type;
98 u8 ant_type;
77626355
BC		 99 u8 is_SGI; /* 1 = short guard interval */
100 u8 is_fat; /* 1 = 40 MHz channel width */
101 u8 is_dup; /* 1 = duplicated data streams */
102 u8 action; /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
103 s32 *expected_tpt; /* throughput metrics; expected_tpt_G, etc. */
39e88504 104 u32 current_rate; /* rate_n_flags, uCode API format */
77626355 105 struct iwl4965_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
b481de9c
ZY		 106};
107
0c11b4de
RR		 108#ifdef CONFIG_IWL4965_HT
109
110struct iwl4965_traffic_load {
111 unsigned long time_stamp; /* age of the oldest statistics */
112 u32 packet_count[TID_QUEUE_MAX_SIZE]; /* packet count in this time
113 * slice */
114 u32 total; /* total num of packets during the
115 * last TID_MAX_TIME_DIFF */
116 u8 queue_count; /* number of queues that has
117 * been used since the last cleanup */
118 u8 head; /* start of the circular buffer */
119};
120
121#endif /* CONFIG_IWL4965_HT */
122
77626355 123/**
0c11b4de 124 * struct iwl4965_lq_sta -- driver's rate scaling private structure
77626355
BC		 125 *
126 * Pointer to this gets passed back and forth between driver and mac80211.
127 */
c33104f0 128struct iwl4965_lq_sta {
77626355
BC		 129 u8 active_tbl; /* index of active table, range 0-1 */
130 u8 enable_counter; /* indicates HT mode */
131 u8 stay_in_tbl; /* 1: disallow, 0: allow search for new mode */
132 u8 search_better_tbl; /* 1: currently trying alternate mode */
b481de9c 133 s32 last_tpt;
77626355
BC		 134
135 /* The following determine when to search for a new mode */
b481de9c 136 u32 table_count_limit;
77626355
BC		 137 u32 max_failure_limit; /* # failed frames before new search */
138 u32 max_success_limit; /* # successful frames before new search */
b481de9c 139 u32 table_count;
77626355
BC		 140 u32 total_failed; /* total failed frames, any/all rates */
141 u32 total_success; /* total successful frames, any/all rates */
142 u32 flush_timer; /* time staying in mode before new search */
143
144 u8 action_counter; /* # mode-switch actions tried */
b481de9c
ZY		 145 u8 is_green;
146 u8 is_dup;
8318d78a 147 enum ieee80211_band band;
b481de9c 148 u8 ibss_sta_added;
77626355
BC		 149
150 /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
02dede04 151 u32 supp_rates;
39e88504 152 u16 active_legacy_rate;
b481de9c 153 u16 active_siso_rate;
fde0db31
GC		 154 u16 active_mimo2_rate;
155 u16 active_mimo3_rate;
b481de9c 156 u16 active_rate_basic;
77626355 157
66c73db7 158 struct iwl_link_quality_cmd lq;
77626355 159 struct iwl4965_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
0c11b4de
RR		 160#ifdef CONFIG_IWL4965_HT
161 struct iwl4965_traffic_load load[TID_MAX_LOAD_COUNT];
162 u8 tx_agg_tid_en;
163#endif
5ae212c9 164#ifdef CONFIG_MAC80211_DEBUGFS
98d7e09a 165 struct dentry *rs_sta_dbgfs_scale_table_file;
0209dc11 166 struct dentry *rs_sta_dbgfs_stats_table_file;
0c11b4de
RR		 167#ifdef CONFIG_IWL4965_HT
168 struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
169#endif
39e88504 170 u32 dbg_fixed_rate;
c79dd5b5 171 struct iwl_priv *drv;
5ae212c9 172#endif
b481de9c
ZY		 173};
174
c79dd5b5 175static void rs_rate_scale_perform(struct iwl_priv *priv,
b481de9c
ZY		 176 struct net_device *dev,
177 struct ieee80211_hdr *hdr,
178 struct sta_info *sta);
fde0db31
GC		 179static void rs_fill_link_cmd(const struct iwl_priv *priv,
180 struct iwl4965_lq_sta *lq_sta,
39e88504 181 u32 rate_n_flags,
66c73db7 182 struct iwl_link_quality_cmd *tbl);
b481de9c
ZY		 183
184
98d7e09a 185#ifdef CONFIG_MAC80211_DEBUGFS
c33104f0 186static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
39e88504 187 u32 *rate_n_flags, int index);
98d7e09a 188#else
c33104f0 189static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
39e88504 190 u32 *rate_n_flags, int index)
98d7e09a
ZY		 191{}
192#endif
77626355
BC		 193
194/*
195 * Expected throughput metrics for following rates:
196 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
197 * "G" is the only table that supports CCK (the first 4 rates).
198 */
fde0db31 199/*FIXME:RS:need to spearate tables for MIMO2/MIMO3*/
b481de9c
ZY		 200static s32 expected_tpt_A[IWL_RATE_COUNT] = {
201 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
202};
203
204static s32 expected_tpt_G[IWL_RATE_COUNT] = {
205 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
206};
207
208static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
209 0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
210};
211
212static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
213 0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
214};
215
216static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
217 0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
218};
219
220static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
221 0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
222};
223
224static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
225 0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
226};
227
228static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
229 0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
230};
231
232static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
233 0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
234};
235
236static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
237 0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
238};
239
39e88504 240static inline u8 rs_extract_rate(u32 rate_n_flags)
b481de9c
ZY		 241{
242 return (u8)(rate_n_flags & 0xFF);
243}
244
bb8c093b 245static void rs_rate_scale_clear_window(struct iwl4965_rate_scale_data *window)
b481de9c
ZY		 246{
247 window->data = 0;
248 window->success_counter = 0;
249 window->success_ratio = IWL_INVALID_VALUE;
250 window->counter = 0;
251 window->average_tpt = IWL_INVALID_VALUE;
252 window->stamp = 0;
b481de9c
ZY		 253}
254
aade00ce
GC		 255static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
256{
257 return ((ant_type & valid_antenna) == ant_type);
258}
259
0c11b4de
RR		 260#ifdef CONFIG_IWL4965_HT
261/*
262 * removes the old data from the statistics. All data that is older than
263 * TID_MAX_TIME_DIFF, will be deleted.
264 */
265static void rs_tl_rm_old_stats(struct iwl4965_traffic_load *tl, u32 curr_time)
266{
267 /* The oldest age we want to keep */
268 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
269
270 while (tl->queue_count &&
271 (tl->time_stamp < oldest_time)) {
272 tl->total -= tl->packet_count[tl->head];
273 tl->packet_count[tl->head] = 0;
274 tl->time_stamp += TID_QUEUE_CELL_SPACING;
275 tl->queue_count--;
276 tl->head++;
277 if (tl->head >= TID_QUEUE_MAX_SIZE)
278 tl->head = 0;
279 }
280}
281
282/*
283 * increment traffic load value for tid and also remove
284 * any old values if passed the certain time period
285 */
286static void rs_tl_add_packet(struct iwl4965_lq_sta *lq_data, u8 tid)
287{
288 u32 curr_time = jiffies_to_msecs(jiffies);
289 u32 time_diff;
290 s32 index;
291 struct iwl4965_traffic_load *tl = NULL;
292
293 if (tid >= TID_MAX_LOAD_COUNT)
294 return;
295
296 tl = &lq_data->load[tid];
297
298 curr_time -= curr_time % TID_ROUND_VALUE;
299
300 /* Happens only for the first packet. Initialize the data */
301 if (!(tl->queue_count)) {
302 tl->total = 1;
303 tl->time_stamp = curr_time;
304 tl->queue_count = 1;
305 tl->head = 0;
306 tl->packet_count[0] = 1;
307 return;
308 }
309
310 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
311 index = time_diff / TID_QUEUE_CELL_SPACING;
312
313 /* The history is too long: remove data that is older than */
314 /* TID_MAX_TIME_DIFF */
315 if (index >= TID_QUEUE_MAX_SIZE)
316 rs_tl_rm_old_stats(tl, curr_time);
317
318 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
319 tl->packet_count[index] = tl->packet_count[index] + 1;
320 tl->total = tl->total + 1;
321
322 if ((index + 1) > tl->queue_count)
323 tl->queue_count = index + 1;
324}
325
326/*
327 get the traffic load value for tid
328*/
329static u32 rs_tl_get_load(struct iwl4965_lq_sta *lq_data, u8 tid)
330{
331 u32 curr_time = jiffies_to_msecs(jiffies);
332 u32 time_diff;
333 s32 index;
334 struct iwl4965_traffic_load *tl = NULL;
335
336 if (tid >= TID_MAX_LOAD_COUNT)
337 return 0;
338
339 tl = &(lq_data->load[tid]);
340
341 curr_time -= curr_time % TID_ROUND_VALUE;
342
343 if (!(tl->queue_count))
344 return 0;
345
346 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
347 index = time_diff / TID_QUEUE_CELL_SPACING;
348
349 /* The history is too long: remove data that is older than */
350 /* TID_MAX_TIME_DIFF */
351 if (index >= TID_QUEUE_MAX_SIZE)
352 rs_tl_rm_old_stats(tl, curr_time);
353
354 return tl->total;
355}
356
c79dd5b5 357static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
0c11b4de
RR		 358 struct iwl4965_lq_sta *lq_data, u8 tid,
359 struct sta_info *sta)
360{
361 unsigned long state;
362 DECLARE_MAC_BUF(mac);
363
364 spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
cee24a3e 365 state = sta->ampdu_mlme.tid_state_tx[tid];
0c11b4de
RR		 366 spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
367
368 if (state == HT_AGG_STATE_IDLE &&
369 rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
370 IWL_DEBUG_HT("Starting Tx agg: STA: %s tid: %d\n",
371 print_mac(mac, sta->addr), tid);
372 ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
373 }
374}
375
c79dd5b5 376static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
0c11b4de
RR		 377 struct iwl4965_lq_sta *lq_data,
378 struct sta_info *sta)
379{
380 if ((tid < TID_MAX_LOAD_COUNT))
381 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
382 else if (tid == IWL_AGG_ALL_TID)
383 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
384 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
385}
386
387#endif /* CONFIG_IWLWIFI_HT */
388
39e88504 389static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
fde0db31 390{
39e88504
GC		 391 return (!!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
392 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
393 !!(rate_n_flags & RATE_MCS_ANT_C_MSK));
fde0db31
GC		 394}
395
77626355
BC		 396/**
397 * rs_collect_tx_data - Update the success/failure sliding window
398 *
399 * We keep a sliding window of the last 62 packets transmitted
400 * at this rate. window->data contains the bitmask of successful
401 * packets.
402 */
bb8c093b 403static int rs_collect_tx_data(struct iwl4965_rate_scale_data *windows,
99556438
RR		 404 int scale_index, s32 tpt, int retries,
405 int successes)
b481de9c 406{
bb8c093b 407 struct iwl4965_rate_scale_data *window = NULL;
39e88504 408 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
b481de9c
ZY		 409 s32 fail_count;
410
dc2453ae
TW		 411 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
412 return -EINVAL;
b481de9c 413
77626355 414 /* Select data for current tx bit rate */
b481de9c
ZY		 415 window = &(windows[scale_index]);
416
77626355
BC		 417 /*
418 * Keep track of only the latest 62 tx frame attempts in this rate's
419 * history window; anything older isn't really relevant any more.
420 * If we have filled up the sliding window, drop the oldest attempt;
421 * if the oldest attempt (highest bit in bitmap) shows "success",
422 * subtract "1" from the success counter (this is the main reason
423 * we keep these bitmaps!).
424 */
99556438 425 while (retries > 0) {
39e88504
GC		 426 if (window->counter >= IWL_RATE_MAX_WINDOW) {
427
428 /* remove earliest */
429 window->counter = IWL_RATE_MAX_WINDOW - 1;
430
99556438
RR		 431 if (window->data & mask) {
432 window->data &= ~mask;
39e88504 433 window->success_counter--;
99556438 434 }
b481de9c 435 }
b481de9c 436
99556438
RR		 437 /* Increment frames-attempted counter */
438 window->counter++;
439
440 /* Shift bitmap by one frame (throw away oldest history),
441 * OR in "1", and increment "success" if this
442 * frame was successful. */
39e88504 443 window->data <<= 1;;
99556438 444 if (successes > 0) {
39e88504 445 window->success_counter++;
99556438
RR		 446 window->data |= 0x1;
447 successes--;
448 }
77626355 449
99556438 450 retries--;
b481de9c
ZY		 451 }
452
77626355 453 /* Calculate current success ratio, avoid divide-by-0! */
b481de9c
ZY		 454 if (window->counter > 0)
455 window->success_ratio = 128 * (100 * window->success_counter)
456 / window->counter;
457 else
458 window->success_ratio = IWL_INVALID_VALUE;
459
460 fail_count = window->counter - window->success_counter;
461
77626355 462 /* Calculate average throughput, if we have enough history. */
b481de9c
ZY		 463 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
464 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
465 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
466 else
467 window->average_tpt = IWL_INVALID_VALUE;
468
77626355 469 /* Tag this window as having been updated */
b481de9c
ZY		 470 window->stamp = jiffies;
471
dc2453ae 472 return 0;
b481de9c
ZY		 473}
474
77626355
BC		 475/*
476 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
477 */
39e88504
GC		 478/* FIXME:RS:remove this function and put the flags statically in the table */
479static u32 rate_n_flags_from_tbl(struct iwl4965_scale_tbl_info *tbl,
480 int index, u8 use_green)
b481de9c 481{
39e88504
GC		 482 u32 rate_n_flags = 0;
483
b481de9c 484 if (is_legacy(tbl->lq_type)) {
39e88504 485 rate_n_flags = iwl4965_rates[index].plcp;
b481de9c 486 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
39e88504 487 rate_n_flags |= RATE_MCS_CCK_MSK;
b481de9c 488
fde0db31
GC		 489 } else if (is_Ht(tbl->lq_type)) {
490 if (index > IWL_LAST_OFDM_RATE) {
491 IWL_ERROR("invalid HT rate index %d\n", index);
b481de9c 492 index = IWL_LAST_OFDM_RATE;
fde0db31 493 }
39e88504 494 rate_n_flags = RATE_MCS_HT_MSK;
fde0db31
GC		 495
496 if (is_siso(tbl->lq_type))
39e88504 497 rate_n_flags |= iwl4965_rates[index].plcp_siso;
fde0db31 498 else if (is_mimo2(tbl->lq_type))
39e88504 499 rate_n_flags |= iwl4965_rates[index].plcp_mimo2;
fde0db31 500 else
39e88504 501 rate_n_flags |= iwl4965_rates[index].plcp_mimo3;
b481de9c 502 } else {
fde0db31 503 IWL_ERROR("Invalid tbl->lq_type %d\n", tbl->lq_type);
b481de9c
ZY		 504 }
505
39e88504 506 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
fde0db31 507 RATE_MCS_ANT_ABC_MSK);
b481de9c 508
39e88504
GC		 509 if (is_Ht(tbl->lq_type)) {
510 if (tbl->is_fat) {
511 if (tbl->is_dup)
512 rate_n_flags |= RATE_MCS_DUP_MSK;
513 else
514 rate_n_flags |= RATE_MCS_FAT_MSK;
515 }
516 if (tbl->is_SGI)
517 rate_n_flags |= RATE_MCS_SGI_MSK;
518
519 if (use_green) {
520 rate_n_flags |= RATE_MCS_GF_MSK;
521 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
522 rate_n_flags &= ~RATE_MCS_SGI_MSK;
523 IWL_ERROR("GF was set with SGI:SISO\n");
524 }
525 }
b481de9c 526 }
39e88504 527 return rate_n_flags;
b481de9c
ZY		 528}
529
77626355
BC		 530/*
531 * Interpret uCode API's rate_n_flags format,
532 * fill "search" or "active" tx mode table.
533 */
39e88504 534static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
8318d78a
JB		 535 enum ieee80211_band band,
536 struct iwl4965_scale_tbl_info *tbl,
b481de9c
ZY		 537 int *rate_idx)
538{
39e88504
GC		 539 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
540 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
541 u8 mcs;
b481de9c 542
39e88504 543 *rate_idx = iwl4965_hwrate_to_plcp_idx(rate_n_flags);
b481de9c 544
fde0db31 545 if (*rate_idx == IWL_RATE_INVALID) {
b481de9c 546 *rate_idx = -1;
dc2453ae 547 return -EINVAL;
b481de9c 548 }
77626355 549 tbl->is_SGI = 0; /* default legacy setup */
b481de9c
ZY		 550 tbl->is_fat = 0;
551 tbl->is_dup = 0;
fde0db31
GC		 552 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
553 tbl->lq_type = LQ_NONE;
b481de9c 554
77626355 555 /* legacy rate format */
39e88504 556 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
fde0db31 557 if (num_of_ant == 1) {
8318d78a 558 if (band == IEEE80211_BAND_5GHZ)
b481de9c
ZY		 559 tbl->lq_type = LQ_A;
560 else
561 tbl->lq_type = LQ_G;
b481de9c 562 }
fde0db31 563 /* HT rate format */
b481de9c 564 } else {
39e88504 565 if (rate_n_flags & RATE_MCS_SGI_MSK)
b481de9c
ZY		 566 tbl->is_SGI = 1;
567
39e88504
GC		 568 if ((rate_n_flags & RATE_MCS_FAT_MSK) ||
569 (rate_n_flags & RATE_MCS_DUP_MSK))
b481de9c
ZY		 570 tbl->is_fat = 1;
571
39e88504 572 if (rate_n_flags & RATE_MCS_DUP_MSK)
b481de9c 573 tbl->is_dup = 1;
fde0db31 574
39e88504 575 mcs = rs_extract_rate(rate_n_flags);
fde0db31 576
39e88504
GC		 577 /* SISO */
578 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
fde0db31
GC		 579 if (num_of_ant == 1)
580 tbl->lq_type = LQ_SISO; /*else NONE*/
581 /* MIMO2 */
39e88504 582 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
fde0db31
GC		 583 if (num_of_ant == 2)
584 tbl->lq_type = LQ_MIMO2;
585 /* MIMO3 */
586 } else {
587 if (num_of_ant == 3)
588 tbl->lq_type = LQ_MIMO3;
589 }
b481de9c
ZY		 590 }
591 return 0;
592}
aade00ce
GC		 593
594/* switch to another antenna/antennas and return 1 */
595/* if no other valid antenna found, return 0 */
596static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
597 struct iwl4965_scale_tbl_info *tbl)
b481de9c 598{
aade00ce
GC		 599 u8 new_ant_type;
600
601 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
602 return 0;
603
604 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
605 return 0;
606
607 new_ant_type = ant_toggle_lookup[tbl->ant_type];
608
609 while ((new_ant_type != tbl->ant_type) &&
610 !rs_is_valid_ant(valid_ant, new_ant_type))
611 new_ant_type = ant_toggle_lookup[new_ant_type];
612
613 if (new_ant_type == tbl->ant_type)
614 return 0;
615
616 tbl->ant_type = new_ant_type;
617 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
618 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
619 return 1;
b481de9c
ZY		 620}
621
39e88504 622/* FIXME:RS: in 4965 we don't use greenfield at all */
f935a6da
GC		 623/* FIXME:RS: don't use greenfield for now in TX */
624/* #ifdef CONFIG_IWL4965_HT */
625#if 0
626static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
b481de9c 627{
270243a5
RR		 628 return ((conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) &&
629 priv->current_ht_config.is_green_field &&
630 !priv->current_ht_config.non_GF_STA_present);
f935a6da 631}
39e88504 632#else
f935a6da
GC		 633static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
634{
dc2453ae 635 return 0;
b481de9c 636}
f935a6da 637#endif /* CONFIG_IWL4965_HT */
b481de9c
ZY		 638
639/**
640 * rs_get_supported_rates - get the available rates
641 *
642 * if management frame or broadcast frame only return
643 * basic available rates.
644 *
645 */
eecd6e57 646static u16 rs_get_supported_rates(struct iwl4965_lq_sta *lq_sta,
b481de9c 647 struct ieee80211_hdr *hdr,
eecd6e57 648 enum iwl_table_type rate_type)
b481de9c 649{
eecd6e57
GC		 650 if (hdr && is_multicast_ether_addr(hdr->addr1) &&
651 lq_sta->active_rate_basic)
652 return lq_sta->active_rate_basic;
653
654 if (is_legacy(rate_type)) {
655 return lq_sta->active_legacy_rate;
656 } else {
b481de9c 657 if (is_siso(rate_type))
eecd6e57 658 return lq_sta->active_siso_rate;
fde0db31 659 else if (is_mimo2(rate_type))
eecd6e57 660 return lq_sta->active_mimo2_rate;
b481de9c 661 else
eecd6e57 662 return lq_sta->active_mimo3_rate;
c33104f0 663 }
b481de9c
ZY		 664}
665
666static u16 rs_get_adjacent_rate(u8 index, u16 rate_mask, int rate_type)
667{
668 u8 high = IWL_RATE_INVALID;
669 u8 low = IWL_RATE_INVALID;
670
01ebd063 671 /* 802.11A or ht walks to the next literal adjacent rate in
b481de9c
ZY		 672 * the rate table */
673 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
674 int i;
675 u32 mask;
676
677 /* Find the previous rate that is in the rate mask */
678 i = index - 1;
679 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
680 if (rate_mask & mask) {
681 low = i;
682 break;
683 }
684 }
685
686 /* Find the next rate that is in the rate mask */
687 i = index + 1;
688 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
689 if (rate_mask & mask) {
690 high = i;
691 break;
692 }
693 }
694
695 return (high << 8) | low;
696 }
697
698 low = index;
699 while (low != IWL_RATE_INVALID) {
bb8c093b 700 low = iwl4965_rates[low].prev_rs;
b481de9c
ZY		 701 if (low == IWL_RATE_INVALID)
702 break;
703 if (rate_mask & (1 << low))
704 break;
705 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
706 }
707
708 high = index;
709 while (high != IWL_RATE_INVALID) {
bb8c093b 710 high = iwl4965_rates[high].next_rs;
b481de9c
ZY		 711 if (high == IWL_RATE_INVALID)
712 break;
713 if (rate_mask & (1 << high))
714 break;
715 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
716 }
717
718 return (high << 8) | low;
719}
720
39e88504 721static u32 rs_get_lower_rate(struct iwl4965_lq_sta *lq_sta,
bb8c093b 722 struct iwl4965_scale_tbl_info *tbl, u8 scale_index,
39e88504 723 u8 ht_possible)
b481de9c 724{
b481de9c
ZY		 725 s32 low;
726 u16 rate_mask;
727 u16 high_low;
728 u8 switch_to_legacy = 0;
c33104f0 729 u8 is_green = lq_sta->is_green;
b481de9c
ZY		 730
731 /* check if we need to switch from HT to legacy rates.
732 * assumption is that mandatory rates (1Mbps or 6Mbps)
733 * are always supported (spec demand) */
734 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
735 switch_to_legacy = 1;
736 scale_index = rs_ht_to_legacy[scale_index];
8318d78a 737 if (lq_sta->band == IEEE80211_BAND_5GHZ)
b481de9c
ZY		 738 tbl->lq_type = LQ_A;
739 else
740 tbl->lq_type = LQ_G;
741
69fdb309 742 if (num_of_ant(tbl->ant_type) > 1)
fde0db31 743 tbl->ant_type = ANT_A;/*FIXME:RS*/
b481de9c
ZY		 744
745 tbl->is_fat = 0;
746 tbl->is_SGI = 0;
747 }
748
eecd6e57 749 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
b481de9c 750
77626355 751 /* Mask with station rate restriction */
b481de9c 752 if (is_legacy(tbl->lq_type)) {
77626355 753 /* supp_rates has no CCK bits in A mode */
8318d78a 754 if (lq_sta->band == IEEE80211_BAND_5GHZ)
b481de9c 755 rate_mask = (u16)(rate_mask &
c33104f0 756 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
b481de9c 757 else
c33104f0 758 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
b481de9c
ZY		 759 }
760
77626355 761 /* If we switched from HT to legacy, check current rate */
dc2453ae 762 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
39e88504
GC		 763 low = scale_index;
764 goto out;
b481de9c
ZY		 765 }
766
767 high_low = rs_get_adjacent_rate(scale_index, rate_mask, tbl->lq_type);
768 low = high_low & 0xff;
769
39e88504
GC		 770 if (low == IWL_RATE_INVALID)
771 low = scale_index;
772
773out:
774 return rate_n_flags_from_tbl(tbl, low, is_green);
b481de9c
ZY		 775}
776
77626355
BC		 777/*
778 * mac80211 sends us Tx status
779 */
c33104f0 780static void rs_tx_status(void *priv_rate, struct net_device *dev,
b481de9c
ZY		 781 struct sk_buff *skb,
782 struct ieee80211_tx_status *tx_resp)
783{
784 int status;
785 u8 retries;
786 int rs_index, index = 0;
c33104f0 787 struct iwl4965_lq_sta *lq_sta;
66c73db7 788 struct iwl_link_quality_cmd *table;
b481de9c
ZY		 789 struct sta_info *sta;
790 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
c79dd5b5 791 struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
b481de9c 792 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
4c424e4c 793 struct ieee80211_hw *hw = local_to_hw(local);
bb8c093b
CH		 794 struct iwl4965_rate_scale_data *window = NULL;
795 struct iwl4965_rate_scale_data *search_win = NULL;
39e88504 796 u32 tx_rate;
bb8c093b
CH		 797 struct iwl4965_scale_tbl_info tbl_type;
798 struct iwl4965_scale_tbl_info *curr_tbl, *search_tbl;
b481de9c
ZY		 799 u8 active_index = 0;
800 u16 fc = le16_to_cpu(hdr->frame_control);
801 s32 tpt = 0;
802
58826351 803 IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
b481de9c
ZY		 804
805 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1))
806 return;
807
99556438
RR		 808 /* This packet was aggregated but doesn't carry rate scale info */
809 if ((tx_resp->control.flags & IEEE80211_TXCTL_AMPDU) &&
810 !(tx_resp->flags & IEEE80211_TX_STATUS_AMPDU))
811 return;
812
b481de9c
ZY		 813 retries = tx_resp->retry_count;
814
815 if (retries > 15)
816 retries = 15;
817
d0709a65 818 rcu_read_lock();
b481de9c
ZY		 819
820 sta = sta_info_get(local, hdr->addr1);
821
f4d6082d
TW		 822 if (!sta || !sta->rate_ctrl_priv)
823 goto out;
824
b481de9c 825
c33104f0 826 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
b481de9c
ZY		 827
828 if (!priv->lq_mngr.lq_ready)
f4d6082d 829 goto out;
b481de9c 830
c33104f0
TW		 831 if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
832 !lq_sta->ibss_sta_added)
f4d6082d 833 goto out;
b481de9c 834
c33104f0
TW		 835 table = &lq_sta->lq;
836 active_index = lq_sta->active_tbl;
b481de9c 837
c33104f0
TW		 838 curr_tbl = &(lq_sta->lq_info[active_index]);
839 search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
bb8c093b 840 window = (struct iwl4965_rate_scale_data *)
b481de9c 841 &(curr_tbl->win[0]);
bb8c093b 842 search_win = (struct iwl4965_rate_scale_data *)
b481de9c
ZY		 843 &(search_tbl->win[0]);
844
77626355
BC		 845 /*
846 * Ignore this Tx frame response if its initial rate doesn't match
847 * that of latest Link Quality command. There may be stragglers
848 * from a previous Link Quality command, but we're no longer interested
849 * in those; they're either from the "active" mode while we're trying
850 * to check "search" mode, or a prior "search" mode after we've moved
851 * to a new "search" mode (which might become the new "active" mode).
852 */
39e88504
GC		 853 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
854 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
4c424e4c
RR		 855 if (priv->band == IEEE80211_BAND_5GHZ)
856 rs_index -= IWL_FIRST_OFDM_RATE;
857
858 if ((tx_resp->control.tx_rate == NULL) ||
859 (tbl_type.is_SGI ^
860 !!(tx_resp->control.flags & IEEE80211_TXCTL_SHORT_GI)) ||
861 (tbl_type.is_fat ^
862 !!(tx_resp->control.flags & IEEE80211_TXCTL_40_MHZ_WIDTH)) ||
863 (tbl_type.is_dup ^
864 !!(tx_resp->control.flags & IEEE80211_TXCTL_DUP_DATA)) ||
fde0db31 865 (tbl_type.ant_type ^ tx_resp->control.antenna_sel_tx) ||
39e88504 866 (!!(tx_rate & RATE_MCS_HT_MSK) ^
4c424e4c 867 !!(tx_resp->control.flags & IEEE80211_TXCTL_OFDM_HT)) ||
39e88504 868 (!!(tx_rate & RATE_MCS_GF_MSK) ^
4c424e4c
RR		 869 !!(tx_resp->control.flags & IEEE80211_TXCTL_GREEN_FIELD)) ||
870 (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
871 tx_resp->control.tx_rate->bitrate)) {
39e88504 872 IWL_DEBUG_RATE("initial rate does not match 0x%x\n", tx_rate);
f4d6082d 873 goto out;
b481de9c
ZY		 874 }
875
77626355 876 /* Update frame history window with "failure" for each Tx retry. */
b481de9c 877 while (retries) {
77626355
BC		 878 /* Look up the rate and other info used for each tx attempt.
879 * Each tx attempt steps one entry deeper in the rate table. */
39e88504
GC		 880 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
881 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
b481de9c
ZY		 882 &tbl_type, &rs_index);
883
77626355
BC		 884 /* If type matches "search" table,
885 * add failure to "search" history */
b481de9c 886 if ((tbl_type.lq_type == search_tbl->lq_type) &&
fde0db31 887 (tbl_type.ant_type == search_tbl->ant_type) &&
b481de9c
ZY		 888 (tbl_type.is_SGI == search_tbl->is_SGI)) {
889 if (search_tbl->expected_tpt)
890 tpt = search_tbl->expected_tpt[rs_index];
891 else
892 tpt = 0;
99556438 893 rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
77626355
BC		 894
895 /* Else if type matches "current/active" table,
896 * add failure to "current/active" history */
b481de9c 897 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
fde0db31 898 (tbl_type.ant_type == curr_tbl->ant_type) &&
b481de9c
ZY		 899 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
900 if (curr_tbl->expected_tpt)
901 tpt = curr_tbl->expected_tpt[rs_index];
902 else
903 tpt = 0;
99556438 904 rs_collect_tx_data(window, rs_index, tpt, 1, 0);
b481de9c 905 }
77626355
BC		 906
907 /* If not searching for a new mode, increment failed counter
908 * ... this helps determine when to start searching again */
c33104f0
TW		 909 if (lq_sta->stay_in_tbl)
910 lq_sta->total_failed++;
b481de9c
ZY		 911 --retries;
912 index++;
913
914 }
915
77626355
BC		 916 /*
917 * Find (by rate) the history window to update with final Tx attempt;
918 * if Tx was successful first try, use original rate,
919 * else look up the rate that was, finally, successful.
920 */
39e88504
GC		 921 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
922 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
b481de9c 923
77626355 924 /* Update frame history window with "success" if Tx got ACKed ... */
b481de9c
ZY		 925 if (tx_resp->flags & IEEE80211_TX_STATUS_ACK)
926 status = 1;
927 else
928 status = 0;
929
77626355
BC		 930 /* If type matches "search" table,
931 * add final tx status to "search" history */
b481de9c 932 if ((tbl_type.lq_type == search_tbl->lq_type) &&
fde0db31 933 (tbl_type.ant_type == search_tbl->ant_type) &&
b481de9c
ZY		 934 (tbl_type.is_SGI == search_tbl->is_SGI)) {
935 if (search_tbl->expected_tpt)
936 tpt = search_tbl->expected_tpt[rs_index];
937 else
938 tpt = 0;
99556438
RR		 939 if (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU)
940 rs_collect_tx_data(search_win, rs_index, tpt,
941 tx_resp->ampdu_ack_len,
942 tx_resp->ampdu_ack_map);
943 else
944 rs_collect_tx_data(search_win, rs_index, tpt,
945 1, status);
77626355
BC		 946 /* Else if type matches "current/active" table,
947 * add final tx status to "current/active" history */
b481de9c 948 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
fde0db31 949 (tbl_type.ant_type == curr_tbl->ant_type) &&
b481de9c
ZY		 950 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
951 if (curr_tbl->expected_tpt)
952 tpt = curr_tbl->expected_tpt[rs_index];
953 else
954 tpt = 0;
99556438
RR		 955 if (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU)
956 rs_collect_tx_data(window, rs_index, tpt,
957 tx_resp->ampdu_ack_len,
958 tx_resp->ampdu_ack_map);
959 else
960 rs_collect_tx_data(window, rs_index, tpt,
961 1, status);
b481de9c
ZY		 962 }
963
77626355
BC		 964 /* If not searching for new mode, increment success/failed counter
965 * ... these help determine when to start searching again */
c33104f0 966 if (lq_sta->stay_in_tbl) {
99556438
RR		 967 if (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU) {
968 lq_sta->total_success += tx_resp->ampdu_ack_map;
969 lq_sta->total_failed +=
970 (tx_resp->ampdu_ack_len - tx_resp->ampdu_ack_map);
971 } else {
972 if (status)
973 lq_sta->total_success++;
974 else
975 lq_sta->total_failed++;
976 }
b481de9c
ZY		 977 }
978
77626355 979 /* See if there's a better rate or modulation mode to try. */
b481de9c 980 rs_rate_scale_perform(priv, dev, hdr, sta);
f4d6082d 981out:
d0709a65 982 rcu_read_unlock();
b481de9c
ZY		 983 return;
984}
985
77626355
BC		 986/*
987 * Begin a period of staying with a selected modulation mode.
988 * Set "stay_in_tbl" flag to prevent any mode switches.
989 * Set frame tx success limits according to legacy vs. high-throughput,
990 * and reset overall (spanning all rates) tx success history statistics.
991 * These control how long we stay using same modulation mode before
992 * searching for a new mode.
993 */
b481de9c 994static void rs_set_stay_in_table(u8 is_legacy,
c33104f0 995 struct iwl4965_lq_sta *lq_sta)
b481de9c 996{
eecd6e57 997 IWL_DEBUG_RATE("we are staying in the same table\n");
c33104f0 998 lq_sta->stay_in_tbl = 1; /* only place this gets set */
b481de9c 999 if (is_legacy) {
c33104f0
TW		 1000 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1001 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1002 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
b481de9c 1003 } else {
c33104f0
TW		 1004 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1005 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1006 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
b481de9c 1007 }
c33104f0
TW		 1008 lq_sta->table_count = 0;
1009 lq_sta->total_failed = 0;
1010 lq_sta->total_success = 0;
b481de9c
ZY		 1011}
1012
77626355
BC		 1013/*
1014 * Find correct throughput table for given mode of modulation
1015 */
eecd6e57 1016static void rs_set_expected_tpt_table(struct iwl4965_lq_sta *lq_sta,
bb8c093b 1017 struct iwl4965_scale_tbl_info *tbl)
b481de9c
ZY		 1018{
1019 if (is_legacy(tbl->lq_type)) {
1020 if (!is_a_band(tbl->lq_type))
1021 tbl->expected_tpt = expected_tpt_G;
1022 else
1023 tbl->expected_tpt = expected_tpt_A;
1024 } else if (is_siso(tbl->lq_type)) {
c33104f0 1025 if (tbl->is_fat && !lq_sta->is_dup)
b481de9c
ZY		 1026 if (tbl->is_SGI)
1027 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
1028 else
1029 tbl->expected_tpt = expected_tpt_siso40MHz;
1030 else if (tbl->is_SGI)
1031 tbl->expected_tpt = expected_tpt_siso20MHzSGI;
1032 else
1033 tbl->expected_tpt = expected_tpt_siso20MHz;
1034
fde0db31 1035 } else if (is_mimo(tbl->lq_type)) { /* FIXME:need to separate mimo2/3 */
c33104f0 1036 if (tbl->is_fat && !lq_sta->is_dup)
b481de9c
ZY		 1037 if (tbl->is_SGI)
1038 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
1039 else
1040 tbl->expected_tpt = expected_tpt_mimo40MHz;
1041 else if (tbl->is_SGI)
1042 tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
1043 else
1044 tbl->expected_tpt = expected_tpt_mimo20MHz;
1045 } else
1046 tbl->expected_tpt = expected_tpt_G;
1047}
1048
c8b0e6e1 1049#ifdef CONFIG_IWL4965_HT
77626355
BC		 1050/*
1051 * Find starting rate for new "search" high-throughput mode of modulation.
1052 * Goal is to find lowest expected rate (under perfect conditions) that is
1053 * above the current measured throughput of "active" mode, to give new mode
1054 * a fair chance to prove itself without too many challenges.
1055 *
1056 * This gets called when transitioning to more aggressive modulation
1057 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1058 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1059 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1060 * bit rate will typically need to increase, but not if performance was bad.
1061 */
c79dd5b5 1062static s32 rs_get_best_rate(struct iwl_priv *priv,
c33104f0 1063 struct iwl4965_lq_sta *lq_sta,
77626355 1064 struct iwl4965_scale_tbl_info *tbl, /* "search" */
f935a6da 1065 u16 rate_mask, s8 index)
b481de9c 1066{
77626355 1067 /* "active" values */
bb8c093b 1068 struct iwl4965_scale_tbl_info *active_tbl =
c33104f0 1069 &(lq_sta->lq_info[lq_sta->active_tbl]);
b481de9c 1070 s32 active_sr = active_tbl->win[index].success_ratio;
b481de9c 1071 s32 active_tpt = active_tbl->expected_tpt[index];
77626355
BC		 1072
1073 /* expected "search" throughput */
1074 s32 *tpt_tbl = tbl->expected_tpt;
1075
1076 s32 new_rate, high, low, start_hi;
b481de9c 1077 u16 high_low;
f935a6da 1078 s8 rate = index;
b481de9c
ZY		 1079
1080 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1081
1082 for (; ;) {
1083 high_low = rs_get_adjacent_rate(rate, rate_mask, tbl->lq_type);
1084
1085 low = high_low & 0xff;
1086 high = (high_low >> 8) & 0xff;
1087
77626355
BC		 1088 /*
1089 * Lower the "search" bit rate, to give new "search" mode
1090 * approximately the same throughput as "active" if:
1091 *
1092 * 1) "Active" mode has been working modestly well (but not
1093 * great), and expected "search" throughput (under perfect
1094 * conditions) at candidate rate is above the actual
1095 * measured "active" throughput (but less than expected
1096 * "active" throughput under perfect conditions).
1097 * OR
1098 * 2) "Active" mode has been working perfectly or very well
1099 * and expected "search" throughput (under perfect
1100 * conditions) at candidate rate is above expected
1101 * "active" throughput (under perfect conditions).
1102 */
c33104f0 1103 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
b481de9c
ZY		 1104 ((active_sr > IWL_RATE_DECREASE_TH) &&
1105 (active_sr <= IWL_RATE_HIGH_TH) &&
1106 (tpt_tbl[rate] <= active_tpt))) ||
1107 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1108 (tpt_tbl[rate] > active_tpt))) {
1109
77626355
BC		 1110 /* (2nd or later pass)
1111 * If we've already tried to raise the rate, and are
1112 * now trying to lower it, use the higher rate. */
b481de9c
ZY		 1113 if (start_hi != IWL_RATE_INVALID) {
1114 new_rate = start_hi;
1115 break;
1116 }
77626355 1117
b481de9c 1118 new_rate = rate;
77626355
BC		 1119
1120 /* Loop again with lower rate */
b481de9c
ZY		 1121 if (low != IWL_RATE_INVALID)
1122 rate = low;
77626355
BC		 1123
1124 /* Lower rate not available, use the original */
b481de9c
ZY		 1125 else
1126 break;
77626355
BC		 1127
1128 /* Else try to raise the "search" rate to match "active" */
b481de9c 1129 } else {
77626355
BC		 1130 /* (2nd or later pass)
1131 * If we've already tried to lower the rate, and are
1132 * now trying to raise it, use the lower rate. */
b481de9c
ZY		 1133 if (new_rate != IWL_RATE_INVALID)
1134 break;
77626355
BC		 1135
1136 /* Loop again with higher rate */
b481de9c
ZY		 1137 else if (high != IWL_RATE_INVALID) {
1138 start_hi = high;
1139 rate = high;
77626355
BC		 1140
1141 /* Higher rate not available, use the original */
b481de9c
ZY		 1142 } else {
1143 new_rate = rate;
1144 break;
1145 }
1146 }
1147 }
1148
1149 return new_rate;
1150}
c8b0e6e1 1151#endif /* CONFIG_IWL4965_HT */
b481de9c 1152
77626355
BC		 1153/*
1154 * Set up search table for MIMO
1155 */
fde0db31
GC		 1156#ifdef CONFIG_IWL4965_HT
1157static int rs_switch_to_mimo2(struct iwl_priv *priv,
c33104f0 1158 struct iwl4965_lq_sta *lq_sta,
270243a5
RR		 1159 struct ieee80211_conf *conf,
1160 struct sta_info *sta,
bb8c093b 1161 struct iwl4965_scale_tbl_info *tbl, int index)
b481de9c 1162{
b481de9c
ZY		 1163 u16 rate_mask;
1164 s32 rate;
c33104f0 1165 s8 is_green = lq_sta->is_green;
b481de9c 1166
270243a5
RR		 1167 if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1168 !sta->ht_info.ht_supported)
b481de9c
ZY		 1169 return -1;
1170
270243a5 1171 if (priv->current_ht_config.tx_mimo_ps_mode == IWL_MIMO_PS_STATIC)
b481de9c
ZY		 1172 return -1;
1173
77626355 1174 /* Need both Tx chains/antennas to support MIMO */
aade00ce 1175 if (priv->hw_params.tx_chains_num < 2)
b481de9c
ZY		 1176 return -1;
1177
eecd6e57 1178 IWL_DEBUG_RATE("LQ: try to switch to MIMO2\n");
39e88504
GC		 1179
1180 tbl->lq_type = LQ_MIMO2;
c33104f0 1181 tbl->is_dup = lq_sta->is_dup;
b481de9c 1182 tbl->action = 0;
39e88504
GC		 1183 rate_mask = lq_sta->active_mimo2_rate;
1184
270243a5 1185 if (priv->current_ht_config.supported_chan_width
39e88504 1186 == IWL_CHANNEL_WIDTH_40MHZ)
b481de9c
ZY		 1187 tbl->is_fat = 1;
1188 else
1189 tbl->is_fat = 0;
1190
39e88504 1191 /* FIXME: - don't toggle SGI here
b481de9c 1192 if (tbl->is_fat) {
270243a5 1193 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
b481de9c
ZY		 1194 tbl->is_SGI = 1;
1195 else
1196 tbl->is_SGI = 0;
270243a5 1197 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
b481de9c
ZY		 1198 tbl->is_SGI = 1;
1199 else
1200 tbl->is_SGI = 0;
39e88504 1201 */
b481de9c 1202
eecd6e57 1203 rs_set_expected_tpt_table(lq_sta, tbl);
b481de9c 1204
f935a6da 1205 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
b481de9c 1206
eecd6e57 1207 IWL_DEBUG_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
39e88504
GC		 1208
1209 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
eecd6e57 1210 IWL_DEBUG_RATE("Can't switch with index %d rate mask %x\n",
39e88504 1211 rate, rate_mask);
b481de9c 1212 return -1;
39e88504
GC		 1213 }
1214 tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
b481de9c 1215
eecd6e57 1216 IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
39e88504 1217 tbl->current_rate, is_green);
dc2453ae 1218 return 0;
fde0db31 1219}
403ab56b 1220#else
fde0db31
GC		 1221static int rs_switch_to_mimo2(struct iwl_priv *priv,
1222 struct iwl4965_lq_sta *lq_sta,
1223 struct ieee80211_conf *conf,
1224 struct sta_info *sta,
1225 struct iwl4965_scale_tbl_info *tbl, int index)
1226{
403ab56b 1227 return -1;
b481de9c 1228}
fde0db31 1229#endif /*CONFIG_IWL4965_HT */
b481de9c 1230
77626355
BC		 1231/*
1232 * Set up search table for SISO
1233 */
c79dd5b5 1234static int rs_switch_to_siso(struct iwl_priv *priv,
c33104f0 1235 struct iwl4965_lq_sta *lq_sta,
270243a5
RR		 1236 struct ieee80211_conf *conf,
1237 struct sta_info *sta,
bb8c093b 1238 struct iwl4965_scale_tbl_info *tbl, int index)
b481de9c 1239{
c8b0e6e1 1240#ifdef CONFIG_IWL4965_HT
b481de9c 1241 u16 rate_mask;
c33104f0 1242 u8 is_green = lq_sta->is_green;
b481de9c
ZY		 1243 s32 rate;
1244
270243a5
RR		 1245 if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1246 !sta->ht_info.ht_supported)
b481de9c
ZY		 1247 return -1;
1248
eecd6e57 1249 IWL_DEBUG_RATE("LQ: try to switch to SISO\n");
39e88504 1250
c33104f0 1251 tbl->is_dup = lq_sta->is_dup;
b481de9c
ZY		 1252 tbl->lq_type = LQ_SISO;
1253 tbl->action = 0;
39e88504 1254 rate_mask = lq_sta->active_siso_rate;
b481de9c 1255
270243a5
RR		 1256 if (priv->current_ht_config.supported_chan_width
1257 == IWL_CHANNEL_WIDTH_40MHZ)
b481de9c
ZY		 1258 tbl->is_fat = 1;
1259 else
1260 tbl->is_fat = 0;
1261
39e88504 1262 /* FIXME: - don't toggle SGI here
b481de9c 1263 if (tbl->is_fat) {
270243a5 1264 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
b481de9c
ZY		 1265 tbl->is_SGI = 1;
1266 else
1267 tbl->is_SGI = 0;
270243a5 1268 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
b481de9c
ZY		 1269 tbl->is_SGI = 1;
1270 else
1271 tbl->is_SGI = 0;
39e88504 1272 */
b481de9c
ZY		 1273
1274 if (is_green)
39e88504 1275 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
b481de9c 1276
eecd6e57 1277 rs_set_expected_tpt_table(lq_sta, tbl);
f935a6da 1278 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
b481de9c 1279
eecd6e57 1280 IWL_DEBUG_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask);
b481de9c 1281 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
eecd6e57 1282 IWL_DEBUG_RATE("can not switch with index %d rate mask %x\n",
b481de9c
ZY		 1283 rate, rate_mask);
1284 return -1;
1285 }
39e88504 1286 tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
eecd6e57 1287 IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
39e88504 1288 tbl->current_rate, is_green);
403ab56b
MA		 1289 return 0;
1290#else
1291 return -1;
0c11b4de 1292#endif /*CONFIG_IWL4965_HT */
b481de9c
ZY		 1293}
1294
77626355
BC		 1295/*
1296 * Try to switch to new modulation mode from legacy
1297 */
c79dd5b5 1298static int rs_move_legacy_other(struct iwl_priv *priv,
c33104f0 1299 struct iwl4965_lq_sta *lq_sta,
270243a5
RR		 1300 struct ieee80211_conf *conf,
1301 struct sta_info *sta,
b481de9c
ZY		 1302 int index)
1303{
bb8c093b 1304 struct iwl4965_scale_tbl_info *tbl =
c33104f0 1305 &(lq_sta->lq_info[lq_sta->active_tbl]);
bb8c093b 1306 struct iwl4965_scale_tbl_info *search_tbl =
c33104f0 1307 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
bb8c093b
CH		 1308 struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1309 u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1310 (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
b481de9c 1311 u8 start_action = tbl->action;
fde0db31
GC		 1312 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1313 int ret = 0;
b481de9c
ZY		 1314
1315 for (; ;) {
1316 switch (tbl->action) {
1317 case IWL_LEGACY_SWITCH_ANTENNA:
f935a6da 1318 IWL_DEBUG_RATE("LQ: Legacy toggle Antenna\n");
b481de9c 1319
c33104f0 1320 lq_sta->action_counter++;
77626355
BC		 1321
1322 /* Don't change antenna if success has been great */
39e88504 1323 /*FIXME:RS:not sure this is really needed*/
b481de9c
ZY		 1324 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1325 break;
77626355 1326
77626355 1327 /* Set up search table to try other antenna */
b481de9c
ZY		 1328 memcpy(search_tbl, tbl, sz);
1329
aade00ce
GC		 1330 if (rs_toggle_antenna(valid_tx_ant,
1331 &search_tbl->current_rate, search_tbl)) {
1332 rs_set_expected_tpt_table(lq_sta, search_tbl);
1333 lq_sta->search_better_tbl = 1;
1334 goto out;
1335 }
b481de9c
ZY		 1336
1337 case IWL_LEGACY_SWITCH_SISO:
eecd6e57 1338 IWL_DEBUG_RATE("LQ: Legacy switch to SISO\n");
77626355
BC		 1339
1340 /* Set up search table to try SISO */
b481de9c 1341 memcpy(search_tbl, tbl, sz);
b481de9c 1342 search_tbl->is_SGI = 0;
c33104f0 1343 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
270243a5 1344 search_tbl, index);
dc2453ae 1345 if (!ret) {
c33104f0
TW		 1346 lq_sta->search_better_tbl = 1;
1347 lq_sta->action_counter = 0;
b481de9c 1348 goto out;
dc2453ae 1349 }
b481de9c
ZY		 1350
1351 break;
fde0db31 1352 case IWL_LEGACY_SWITCH_MIMO2:
eecd6e57 1353 IWL_DEBUG_RATE("LQ: Legacy switch to MIMO2\n");
77626355
BC		 1354
1355 /* Set up search table to try MIMO */
b481de9c 1356 memcpy(search_tbl, tbl, sz);
b481de9c 1357 search_tbl->is_SGI = 0;
fde0db31
GC		 1358 search_tbl->ant_type = ANT_AB;/*FIXME:RS*/
1359 /*FIXME:RS:need to check ant validity*/
1360 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
270243a5 1361 search_tbl, index);
dc2453ae 1362 if (!ret) {
c33104f0
TW		 1363 lq_sta->search_better_tbl = 1;
1364 lq_sta->action_counter = 0;
b481de9c 1365 goto out;
dc2453ae 1366 }
b481de9c
ZY		 1367 break;
1368 }
1369 tbl->action++;
fde0db31 1370 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2)
b481de9c
ZY		 1371 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1372
1373 if (tbl->action == start_action)
1374 break;
1375
1376 }
1377 return 0;
1378
1379 out:
1380 tbl->action++;
fde0db31 1381 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2)
b481de9c
ZY		 1382 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1383 return 0;
1384
1385}
1386
77626355
BC		 1387/*
1388 * Try to switch to new modulation mode from SISO
1389 */
c79dd5b5 1390static int rs_move_siso_to_other(struct iwl_priv *priv,
c33104f0 1391 struct iwl4965_lq_sta *lq_sta,
270243a5
RR		 1392 struct ieee80211_conf *conf,
1393 struct sta_info *sta,
b481de9c
ZY		 1394 int index)
1395{
c33104f0 1396 u8 is_green = lq_sta->is_green;
bb8c093b 1397 struct iwl4965_scale_tbl_info *tbl =
c33104f0 1398 &(lq_sta->lq_info[lq_sta->active_tbl]);
bb8c093b 1399 struct iwl4965_scale_tbl_info *search_tbl =
c33104f0 1400 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
bb8c093b
CH		 1401 struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1402 u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1403 (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
b481de9c 1404 u8 start_action = tbl->action;
fde0db31
GC		 1405 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1406 int ret;
b481de9c
ZY		 1407
1408 for (;;) {
c33104f0 1409 lq_sta->action_counter++;
b481de9c
ZY		 1410 switch (tbl->action) {
1411 case IWL_SISO_SWITCH_ANTENNA:
eecd6e57 1412 IWL_DEBUG_RATE("LQ: SISO toggle Antenna\n");
39e88504 1413 /*FIXME:RS: is this really needed for SISO?*/
b481de9c
ZY		 1414 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1415 break;
b481de9c
ZY		 1416
1417 memcpy(search_tbl, tbl, sz);
aade00ce
GC		 1418 if (rs_toggle_antenna(valid_tx_ant,
1419 &search_tbl->current_rate, search_tbl)) {
1420 lq_sta->search_better_tbl = 1;
1421 goto out;
1422 }
b481de9c 1423
fde0db31 1424 case IWL_SISO_SWITCH_MIMO2:
eecd6e57 1425 IWL_DEBUG_RATE("LQ: SISO switch to MIMO\n");
b481de9c 1426 memcpy(search_tbl, tbl, sz);
b481de9c 1427 search_tbl->is_SGI = 0;
fde0db31
GC		 1428 search_tbl->ant_type = ANT_AB; /*FIXME:RS*/
1429 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
270243a5 1430 search_tbl, index);
dc2453ae 1431 if (!ret) {
c33104f0 1432 lq_sta->search_better_tbl = 1;
b481de9c 1433 goto out;
dc2453ae 1434 }
b481de9c
ZY		 1435 break;
1436 case IWL_SISO_SWITCH_GI:
eecd6e57 1437 IWL_DEBUG_RATE("LQ: SISO toggle SGI/NGI\n");
0c11b4de 1438
b481de9c 1439 memcpy(search_tbl, tbl, sz);
39e88504
GC		 1440 if (is_green) {
1441 if (!tbl->is_SGI)
1442 break;
1443 else
1444 IWL_ERROR("SGI was set in GF+SISO\n");
b481de9c 1445 }
39e88504 1446 search_tbl->is_SGI = !tbl->is_SGI;
eecd6e57 1447 rs_set_expected_tpt_table(lq_sta, search_tbl);
39e88504
GC		 1448 if (tbl->is_SGI) {
1449 s32 tpt = lq_sta->last_tpt / 100;
1450 if (tpt >= search_tbl->expected_tpt[index])
1451 break;
1452 }
1453 search_tbl->current_rate = rate_n_flags_from_tbl(
1454 search_tbl, index, is_green);
1455 lq_sta->search_better_tbl = 1;
b481de9c
ZY		 1456 goto out;
1457 }
1458 tbl->action++;
1459 if (tbl->action > IWL_SISO_SWITCH_GI)
1460 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1461
1462 if (tbl->action == start_action)
1463 break;
1464 }
1465 return 0;
1466
1467 out:
1468 tbl->action++;
1469 if (tbl->action > IWL_SISO_SWITCH_GI)
1470 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1471 return 0;
1472}
1473
77626355
BC		 1474/*
1475 * Try to switch to new modulation mode from MIMO
1476 */
c79dd5b5 1477static int rs_move_mimo_to_other(struct iwl_priv *priv,
c33104f0 1478 struct iwl4965_lq_sta *lq_sta,
270243a5
RR		 1479 struct ieee80211_conf *conf,
1480 struct sta_info *sta,
b481de9c
ZY		 1481 int index)
1482{
c33104f0 1483 s8 is_green = lq_sta->is_green;
bb8c093b 1484 struct iwl4965_scale_tbl_info *tbl =
c33104f0 1485 &(lq_sta->lq_info[lq_sta->active_tbl]);
bb8c093b 1486 struct iwl4965_scale_tbl_info *search_tbl =
c33104f0 1487 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
bb8c093b
CH		 1488 u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1489 (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
b481de9c 1490 u8 start_action = tbl->action;
aade00ce
GC		 1491 /*u8 valid_tx_ant = priv->hw_params.valid_tx_ant;*/
1492 int ret;
b481de9c
ZY		 1493
1494 for (;;) {
c33104f0 1495 lq_sta->action_counter++;
b481de9c
ZY		 1496 switch (tbl->action) {
1497 case IWL_MIMO_SWITCH_ANTENNA_A:
1498 case IWL_MIMO_SWITCH_ANTENNA_B:
eecd6e57 1499 IWL_DEBUG_RATE("LQ: MIMO2 switch to SISO\n");
0c11b4de 1500
77626355 1501 /* Set up new search table for SISO */
b481de9c 1502 memcpy(search_tbl, tbl, sz);
39e88504
GC		 1503
1504 /*FIXME:RS:need to check ant validity + C*/
b481de9c 1505 if (tbl->action == IWL_MIMO_SWITCH_ANTENNA_A)
fde0db31 1506 search_tbl->ant_type = ANT_A;
b481de9c 1507 else
fde0db31 1508 search_tbl->ant_type = ANT_B;
b481de9c 1509
c33104f0 1510 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
270243a5 1511 search_tbl, index);
dc2453ae 1512 if (!ret) {
c33104f0 1513 lq_sta->search_better_tbl = 1;
b481de9c
ZY		 1514 goto out;
1515 }
1516 break;
1517
1518 case IWL_MIMO_SWITCH_GI:
eecd6e57 1519 IWL_DEBUG_RATE("LQ: MIMO toggle SGI/NGI\n");
77626355
BC		 1520
1521 /* Set up new search table for MIMO */
b481de9c 1522 memcpy(search_tbl, tbl, sz);
39e88504 1523 search_tbl->is_SGI = !tbl->is_SGI;
eecd6e57 1524 rs_set_expected_tpt_table(lq_sta, search_tbl);
77626355
BC		 1525 /*
1526 * If active table already uses the fastest possible
1527 * modulation (dual stream with short guard interval),
1528 * and it's working well, there's no need to look
1529 * for a better type of modulation!
1530 */
39e88504 1531 if (tbl->is_SGI) {
c33104f0 1532 s32 tpt = lq_sta->last_tpt / 100;
39e88504
GC		 1533 if (tpt >= search_tbl->expected_tpt[index])
1534 break;
b481de9c 1535 }
39e88504
GC		 1536 search_tbl->current_rate = rate_n_flags_from_tbl(
1537 search_tbl, index, is_green);
1538 lq_sta->search_better_tbl = 1;
b481de9c
ZY		 1539 goto out;
1540
1541 }
1542 tbl->action++;
1543 if (tbl->action > IWL_MIMO_SWITCH_GI)
1544 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1545
1546 if (tbl->action == start_action)
1547 break;
1548 }
1549
1550 return 0;
1551 out:
1552 tbl->action++;
1553 if (tbl->action > IWL_MIMO_SWITCH_GI)
1554 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1555 return 0;
1556
1557}
1558
77626355
BC		 1559/*
1560 * Check whether we should continue using same modulation mode, or
1561 * begin search for a new mode, based on:
1562 * 1) # tx successes or failures while using this mode
1563 * 2) # times calling this function
1564 * 3) elapsed time in this mode (not used, for now)
1565 */
c33104f0 1566static void rs_stay_in_table(struct iwl4965_lq_sta *lq_sta)
b481de9c 1567{
bb8c093b 1568 struct iwl4965_scale_tbl_info *tbl;
b481de9c
ZY		 1569 int i;
1570 int active_tbl;
1571 int flush_interval_passed = 0;
1572
c33104f0 1573 active_tbl = lq_sta->active_tbl;
b481de9c 1574
c33104f0 1575 tbl = &(lq_sta->lq_info[active_tbl]);
b481de9c 1576
77626355 1577 /* If we've been disallowing search, see if we should now allow it */
c33104f0 1578 if (lq_sta->stay_in_tbl) {
b481de9c 1579
77626355 1580 /* Elapsed time using current modulation mode */
c33104f0 1581 if (lq_sta->flush_timer)
b481de9c
ZY		 1582 flush_interval_passed =
1583 time_after(jiffies,
c33104f0 1584 (unsigned long)(lq_sta->flush_timer +
b481de9c
ZY		 1585 IWL_RATE_SCALE_FLUSH_INTVL));
1586
77626355
BC		 1587 /*
1588 * Check if we should allow search for new modulation mode.
1589 * If many frames have failed or succeeded, or we've used
1590 * this same modulation for a long time, allow search, and
1591 * reset history stats that keep track of whether we should
1592 * allow a new search. Also (below) reset all bitmaps and
1593 * stats in active history.
1594 */
c33104f0
TW		 1595 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1596 (lq_sta->total_success > lq_sta->max_success_limit) ||
1597 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
b481de9c 1598 && (flush_interval_passed))) {
eecd6e57 1599 IWL_DEBUG_RATE("LQ: stay is expired %d %d %d\n:",
c33104f0
TW		 1600 lq_sta->total_failed,
1601 lq_sta->total_success,
b481de9c 1602 flush_interval_passed);
77626355
BC		 1603
1604 /* Allow search for new mode */
c33104f0
TW		 1605 lq_sta->stay_in_tbl = 0; /* only place reset */
1606 lq_sta->total_failed = 0;
1607 lq_sta->total_success = 0;
1608 lq_sta->flush_timer = 0;
77626355
BC		 1609
1610 /*
1611 * Else if we've used this modulation mode enough repetitions
1612 * (regardless of elapsed time or success/failure), reset
1613 * history bitmaps and rate-specific stats for all rates in
1614 * active table.
1615 */
403ab56b 1616 } else {
c33104f0
TW		 1617 lq_sta->table_count++;
1618 if (lq_sta->table_count >=
1619 lq_sta->table_count_limit) {
1620 lq_sta->table_count = 0;
b481de9c 1621
eecd6e57 1622 IWL_DEBUG_RATE("LQ: stay in table clear win\n");
b481de9c
ZY		 1623 for (i = 0; i < IWL_RATE_COUNT; i++)
1624 rs_rate_scale_clear_window(
1625 &(tbl->win[i]));
1626 }
1627 }
1628
77626355
BC		 1629 /* If transitioning to allow "search", reset all history
1630 * bitmaps and stats in active table (this will become the new
1631 * "search" table). */
c33104f0 1632 if (!lq_sta->stay_in_tbl) {
b481de9c
ZY		 1633 for (i = 0; i < IWL_RATE_COUNT; i++)
1634 rs_rate_scale_clear_window(&(tbl->win[i]));
1635 }
1636 }
1637}
1638
77626355
BC		 1639/*
1640 * Do rate scaling and search for new modulation mode.
1641 */
c79dd5b5 1642static void rs_rate_scale_perform(struct iwl_priv *priv,
b481de9c
ZY		 1643 struct net_device *dev,
1644 struct ieee80211_hdr *hdr,
1645 struct sta_info *sta)
1646{
270243a5
RR		 1647 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1648 struct ieee80211_hw *hw = local_to_hw(local);
1649 struct ieee80211_conf *conf = &hw->conf;
b481de9c
ZY		 1650 int low = IWL_RATE_INVALID;
1651 int high = IWL_RATE_INVALID;
1652 int index;
1653 int i;
bb8c093b 1654 struct iwl4965_rate_scale_data *window = NULL;
b481de9c
ZY		 1655 int current_tpt = IWL_INVALID_VALUE;
1656 int low_tpt = IWL_INVALID_VALUE;
1657 int high_tpt = IWL_INVALID_VALUE;
1658 u32 fail_count;
1659 s8 scale_action = 0;
1660 u16 fc, rate_mask;
1661 u8 update_lq = 0;
c33104f0 1662 struct iwl4965_lq_sta *lq_sta;
bb8c093b 1663 struct iwl4965_scale_tbl_info *tbl, *tbl1;
b481de9c 1664 u16 rate_scale_index_msk = 0;
39e88504 1665 u32 rate;
b481de9c
ZY		 1666 u8 is_green = 0;
1667 u8 active_tbl = 0;
1668 u8 done_search = 0;
1669 u16 high_low;
0c11b4de
RR		 1670#ifdef CONFIG_IWL4965_HT
1671 u8 tid = MAX_TID_COUNT;
1672 __le16 *qc;
1673#endif
b481de9c
ZY		 1674
1675 IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1676
1677 fc = le16_to_cpu(hdr->frame_control);
1678 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
1679 /* Send management frames and broadcast/multicast data using
1680 * lowest rate. */
1681 /* TODO: this could probably be improved.. */
1682 return;
1683 }
1684
1685 if (!sta || !sta->rate_ctrl_priv)
1686 return;
1687
1688 if (!priv->lq_mngr.lq_ready) {
1689 IWL_DEBUG_RATE("still rate scaling not ready\n");
1690 return;
1691 }
c33104f0 1692 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
b481de9c 1693
0c11b4de
RR		 1694#ifdef CONFIG_IWL4965_HT
1695 qc = ieee80211_get_qos_ctrl(hdr);
1696 if (qc) {
1697 tid = (u8)(le16_to_cpu(*qc) & 0xf);
1698 rs_tl_add_packet(lq_sta, tid);
1699 }
1700#endif
77626355
BC		 1701 /*
1702 * Select rate-scale / modulation-mode table to work with in
1703 * the rest of this function: "search" if searching for better
1704 * modulation mode, or "active" if doing rate scaling within a mode.
1705 */
c33104f0
TW		 1706 if (!lq_sta->search_better_tbl)
1707 active_tbl = lq_sta->active_tbl;
b481de9c 1708 else
c33104f0 1709 active_tbl = 1 - lq_sta->active_tbl;
b481de9c 1710
c33104f0
TW		 1711 tbl = &(lq_sta->lq_info[active_tbl]);
1712 is_green = lq_sta->is_green;
b481de9c 1713
77626355 1714 /* current tx rate */
8318d78a 1715 index = sta->last_txrate_idx;
b481de9c
ZY		 1716
1717 IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1718 tbl->lq_type);
1719
77626355 1720 /* rates available for this association, and for modulation mode */
eecd6e57 1721 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
b481de9c
ZY		 1722
1723 IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1724
1725 /* mask with station rate restriction */
1726 if (is_legacy(tbl->lq_type)) {
8318d78a 1727 if (lq_sta->band == IEEE80211_BAND_5GHZ)
77626355 1728 /* supp_rates has no CCK bits in A mode */
b481de9c 1729 rate_scale_index_msk = (u16) (rate_mask &
c33104f0 1730 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
b481de9c
ZY		 1731 else
1732 rate_scale_index_msk = (u16) (rate_mask &
c33104f0 1733 lq_sta->supp_rates);
b481de9c
ZY		 1734
1735 } else
1736 rate_scale_index_msk = rate_mask;
1737
1738 if (!rate_scale_index_msk)
1739 rate_scale_index_msk = rate_mask;
1740
77626355
BC		 1741 /* If current rate is no longer supported on current association,
1742 * or user changed preferences for rates, find a new supported rate. */
b481de9c
ZY		 1743 if (index < 0 || !((1 << index) & rate_scale_index_msk)) {
1744 index = IWL_INVALID_VALUE;
1745 update_lq = 1;
1746
77626355 1747 /* get the highest available rate */
b481de9c
ZY		 1748 for (i = 0; i <= IWL_RATE_COUNT; i++) {
1749 if ((1 << i) & rate_scale_index_msk)
1750 index = i;
1751 }
1752
1753 if (index == IWL_INVALID_VALUE) {
1754 IWL_WARNING("Can not find a suitable rate\n");
1755 return;
1756 }
1757 }
1758
77626355 1759 /* Get expected throughput table and history window for current rate */
b481de9c 1760 if (!tbl->expected_tpt)
eecd6e57 1761 rs_set_expected_tpt_table(lq_sta, tbl);
b481de9c
ZY		 1762
1763 window = &(tbl->win[index]);
1764
77626355
BC		 1765 /*
1766 * If there is not enough history to calculate actual average
1767 * throughput, keep analyzing results of more tx frames, without
1768 * changing rate or mode (bypass most of the rest of this function).
1769 * Set up new rate table in uCode only if old rate is not supported
1770 * in current association (use new rate found above).
1771 */
b481de9c
ZY		 1772 fail_count = window->counter - window->success_counter;
1773 if (((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1774 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH))
1775 || (tbl->expected_tpt == NULL)) {
1776 IWL_DEBUG_RATE("LQ: still below TH succ %d total %d "
1777 "for index %d\n",
1778 window->success_counter, window->counter, index);
77626355
BC		 1779
1780 /* Can't calculate this yet; not enough history */
b481de9c 1781 window->average_tpt = IWL_INVALID_VALUE;
77626355
BC		 1782
1783 /* Should we stay with this modulation mode,
1784 * or search for a new one? */
c33104f0 1785 rs_stay_in_table(lq_sta);
77626355
BC		 1786
1787 /* Set up new rate table in uCode, if needed */
b481de9c 1788 if (update_lq) {
39e88504
GC		 1789 rate = rate_n_flags_from_tbl(tbl, index, is_green);
1790 rs_fill_link_cmd(priv, lq_sta, rate, &lq_sta->lq);
66c73db7 1791 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
b481de9c
ZY		 1792 }
1793 goto out;
1794
77626355
BC		 1795 /* Else we have enough samples; calculate estimate of
1796 * actual average throughput */
b481de9c
ZY		 1797 } else
1798 window->average_tpt = ((window->success_ratio *
1799 tbl->expected_tpt[index] + 64) / 128);
1800
77626355 1801 /* If we are searching for better modulation mode, check success. */
c33104f0 1802 if (lq_sta->search_better_tbl) {
b481de9c
ZY		 1803 int success_limit = IWL_RATE_SCALE_SWITCH;
1804
77626355
BC		 1805 /* If good success, continue using the "search" mode;
1806 * no need to send new link quality command, since we're
1807 * continuing to use the setup that we've been trying. */
b481de9c 1808 if ((window->success_ratio > success_limit) ||
c33104f0 1809 (window->average_tpt > lq_sta->last_tpt)) {
b481de9c 1810 if (!is_legacy(tbl->lq_type)) {
eecd6e57 1811 IWL_DEBUG_RATE("LQ: we are switching to HT"
b481de9c
ZY		 1812 " rate suc %d current tpt %d"
1813 " old tpt %d\n",
1814 window->success_ratio,
1815 window->average_tpt,
c33104f0
TW		 1816 lq_sta->last_tpt);
1817 lq_sta->enable_counter = 1;
b481de9c 1818 }
77626355 1819 /* Swap tables; "search" becomes "active" */
c33104f0 1820 lq_sta->active_tbl = active_tbl;
b481de9c 1821 current_tpt = window->average_tpt;
77626355
BC		 1822
1823 /* Else poor success; go back to mode in "active" table */
b481de9c 1824 } else {
77626355 1825 /* Nullify "search" table */
b481de9c 1826 tbl->lq_type = LQ_NONE;
77626355
BC		 1827
1828 /* Revert to "active" table */
c33104f0
TW		 1829 active_tbl = lq_sta->active_tbl;
1830 tbl = &(lq_sta->lq_info[active_tbl]);
b481de9c 1831
77626355 1832 /* Revert to "active" rate and throughput info */
17744ff6 1833 index = iwl4965_hwrate_to_plcp_idx(
39e88504 1834 tbl->current_rate);
c33104f0 1835 current_tpt = lq_sta->last_tpt;
b481de9c 1836
77626355 1837 /* Need to set up a new rate table in uCode */
b481de9c 1838 update_lq = 1;
eecd6e57 1839 IWL_DEBUG_RATE("XXY GO BACK TO OLD TABLE\n");
b481de9c 1840 }
77626355
BC		 1841
1842 /* Either way, we've made a decision; modulation mode
1843 * search is done, allow rate adjustment next time. */
c33104f0 1844 lq_sta->search_better_tbl = 0;
77626355 1845 done_search = 1; /* Don't switch modes below! */
b481de9c
ZY		 1846 goto lq_update;
1847 }
1848
77626355
BC		 1849 /* (Else) not in search of better modulation mode, try for better
1850 * starting rate, while staying in this mode. */
b481de9c
ZY		 1851 high_low = rs_get_adjacent_rate(index, rate_scale_index_msk,
1852 tbl->lq_type);
1853 low = high_low & 0xff;
1854 high = (high_low >> 8) & 0xff;
1855
77626355 1856 /* Collect measured throughputs for current and adjacent rates */
b481de9c 1857 current_tpt = window->average_tpt;
b481de9c
ZY		 1858 if (low != IWL_RATE_INVALID)
1859 low_tpt = tbl->win[low].average_tpt;
b481de9c
ZY		 1860 if (high != IWL_RATE_INVALID)
1861 high_tpt = tbl->win[high].average_tpt;
1862
77626355 1863 /* Assume rate increase */
b481de9c
ZY		 1864 scale_action = 1;
1865
77626355 1866 /* Too many failures, decrease rate */
b481de9c
ZY		 1867 if ((window->success_ratio <= IWL_RATE_DECREASE_TH) ||
1868 (current_tpt == 0)) {
1869 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1870 scale_action = -1;
77626355
BC		 1871
1872 /* No throughput measured yet for adjacent rates; try increase. */
b481de9c
ZY		 1873 } else if ((low_tpt == IWL_INVALID_VALUE) &&
1874 (high_tpt == IWL_INVALID_VALUE))
1875 scale_action = 1;
77626355
BC		 1876
1877 /* Both adjacent throughputs are measured, but neither one has better
1878 * throughput; we're using the best rate, don't change it! */
b481de9c
ZY		 1879 else if ((low_tpt != IWL_INVALID_VALUE) &&
1880 (high_tpt != IWL_INVALID_VALUE) &&
1881 (low_tpt < current_tpt) &&
1882 (high_tpt < current_tpt))
1883 scale_action = 0;
77626355
BC		 1884
1885 /* At least one adjacent rate's throughput is measured,
1886 * and may have better performance. */
b481de9c 1887 else {
77626355 1888 /* Higher adjacent rate's throughput is measured */
b481de9c 1889 if (high_tpt != IWL_INVALID_VALUE) {
77626355 1890 /* Higher rate has better throughput */
b481de9c
ZY		 1891 if (high_tpt > current_tpt)
1892 scale_action = 1;
1893 else {
1894 IWL_DEBUG_RATE
1895 ("decrease rate because of high tpt\n");
1896 scale_action = -1;
1897 }
77626355
BC		 1898
1899 /* Lower adjacent rate's throughput is measured */
b481de9c 1900 } else if (low_tpt != IWL_INVALID_VALUE) {
77626355 1901 /* Lower rate has better throughput */
b481de9c
ZY		 1902 if (low_tpt > current_tpt) {
1903 IWL_DEBUG_RATE
1904 ("decrease rate because of low tpt\n");
1905 scale_action = -1;
1906 } else
1907 scale_action = 1;
1908 }
1909 }
1910
77626355
BC		 1911 /* Sanity check; asked for decrease, but success rate or throughput
1912 * has been good at old rate. Don't change it. */
b481de9c
ZY		 1913 if (scale_action == -1) {
1914 if ((low != IWL_RATE_INVALID) &&
1915 ((window->success_ratio > IWL_RATE_HIGH_TH) ||
1916 (current_tpt > (100 * tbl->expected_tpt[low]))))
1917 scale_action = 0;
77626355
BC		 1918
1919 /* Sanity check; asked for increase, but success rate has not been great
1920 * even at old rate, higher rate will be worse. Don't change it. */
b481de9c
ZY		 1921 } else if ((scale_action == 1) &&
1922 (window->success_ratio < IWL_RATE_INCREASE_TH))
1923 scale_action = 0;
1924
1925 switch (scale_action) {
1926 case -1:
77626355 1927 /* Decrease starting rate, update uCode's rate table */
b481de9c
ZY		 1928 if (low != IWL_RATE_INVALID) {
1929 update_lq = 1;
1930 index = low;
1931 }
1932 break;
1933 case 1:
77626355 1934 /* Increase starting rate, update uCode's rate table */
b481de9c
ZY		 1935 if (high != IWL_RATE_INVALID) {
1936 update_lq = 1;
1937 index = high;
1938 }
1939
1940 break;
1941 case 0:
77626355 1942 /* No change */
b481de9c
ZY		 1943 default:
1944 break;
1945 }
1946
eecd6e57 1947 IWL_DEBUG_RATE("choose rate scale index %d action %d low %d "
b481de9c
ZY		 1948 "high %d type %d\n",
1949 index, scale_action, low, high, tbl->lq_type);
1950
1951 lq_update:
77626355 1952 /* Replace uCode's rate table for the destination station. */
b481de9c 1953 if (update_lq) {
39e88504
GC		 1954 rate = rate_n_flags_from_tbl(tbl, index, is_green);
1955 rs_fill_link_cmd(priv, lq_sta, rate, &lq_sta->lq);
66c73db7 1956 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
b481de9c 1957 }
77626355
BC		 1958
1959 /* Should we stay with this modulation mode, or search for a new one? */
c33104f0 1960 rs_stay_in_table(lq_sta);
b481de9c 1961
77626355
BC		 1962 /*
1963 * Search for new modulation mode if we're:
1964 * 1) Not changing rates right now
1965 * 2) Not just finishing up a search
1966 * 3) Allowing a new search
1967 */
c33104f0 1968 if (!update_lq && !done_search && !lq_sta->stay_in_tbl) {
77626355 1969 /* Save current throughput to compare with "search" throughput*/
c33104f0 1970 lq_sta->last_tpt = current_tpt;
b481de9c 1971
77626355
BC		 1972 /* Select a new "search" modulation mode to try.
1973 * If one is found, set up the new "search" table. */
b481de9c 1974 if (is_legacy(tbl->lq_type))
c33104f0 1975 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
b481de9c 1976 else if (is_siso(tbl->lq_type))
c33104f0 1977 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
b481de9c 1978 else
c33104f0 1979 rs_move_mimo_to_other(priv, lq_sta, conf, sta, index);
b481de9c 1980
77626355 1981 /* If new "search" mode was selected, set up in uCode table */
c33104f0 1982 if (lq_sta->search_better_tbl) {
77626355 1983 /* Access the "search" table, clear its history. */
c33104f0 1984 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
b481de9c
ZY		 1985 for (i = 0; i < IWL_RATE_COUNT; i++)
1986 rs_rate_scale_clear_window(&(tbl->win[i]));
1987
77626355 1988 /* Use new "search" start rate */
17744ff6 1989 index = iwl4965_hwrate_to_plcp_idx(
39e88504 1990 tbl->current_rate);
b481de9c 1991
eecd6e57 1992 IWL_DEBUG_RATE("Switch current mcs: %X index: %d\n",
39e88504
GC		 1993 tbl->current_rate, index);
1994 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate,
c33104f0 1995 &lq_sta->lq);
66c73db7 1996 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
b481de9c 1997 }
b481de9c 1998
77626355
BC		 1999 /* If the "active" (non-search) mode was legacy,
2000 * and we've tried switching antennas,
2001 * but we haven't been able to try HT modes (not available),
2002 * stay with best antenna legacy modulation for a while
2003 * before next round of mode comparisons. */
c33104f0 2004 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
b481de9c 2005 if (is_legacy(tbl1->lq_type) &&
c8b0e6e1 2006#ifdef CONFIG_IWL4965_HT
270243a5 2007 (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)) &&
b481de9c 2008#endif
c33104f0
TW		 2009 (lq_sta->action_counter >= 1)) {
2010 lq_sta->action_counter = 0;
eecd6e57 2011 IWL_DEBUG_RATE("LQ: STAY in legacy table\n");
c33104f0 2012 rs_set_stay_in_table(1, lq_sta);
b481de9c
ZY		 2013 }
2014
77626355
BC		 2015 /* If we're in an HT mode, and all 3 mode switch actions
2016 * have been tried and compared, stay in this best modulation
2017 * mode for a while before next round of mode comparisons. */
c33104f0
TW		 2018 if (lq_sta->enable_counter &&
2019 (lq_sta->action_counter >= IWL_ACTION_LIMIT)) {
0c11b4de
RR		 2020#ifdef CONFIG_IWL4965_HT
2021 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2022 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2023 (tid != MAX_TID_COUNT)) {
eecd6e57 2024 IWL_DEBUG_RATE("try to aggregate tid %d\n", tid);
0c11b4de 2025 rs_tl_turn_on_agg(priv, tid, lq_sta, sta);
b481de9c 2026 }
0c11b4de 2027#endif /*CONFIG_IWL4965_HT */
c33104f0
TW		 2028 lq_sta->action_counter = 0;
2029 rs_set_stay_in_table(0, lq_sta);
b481de9c 2030 }
77626355
BC		 2031
2032 /*
2033 * Else, don't search for a new modulation mode.
2034 * Put new timestamp in stay-in-modulation-mode flush timer if:
2035 * 1) Not changing rates right now
2036 * 2) Not just finishing up a search
2037 * 3) flush timer is empty
2038 */
b481de9c 2039 } else {
c33104f0
TW		 2040 if ((!update_lq) && (!done_search) && (!lq_sta->flush_timer))
2041 lq_sta->flush_timer = jiffies;
b481de9c
ZY		 2042 }
2043
2044out:
39e88504 2045 tbl->current_rate = rate_n_flags_from_tbl(tbl, index, is_green);
b481de9c 2046 i = index;
8318d78a 2047 sta->last_txrate_idx = i;
b481de9c 2048
8318d78a 2049 /* sta->txrate_idx is an index to A mode rates which start
b481de9c
ZY		 2050 * at IWL_FIRST_OFDM_RATE
2051 */
8318d78a
JB		 2052 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2053 sta->txrate_idx = i - IWL_FIRST_OFDM_RATE;
b481de9c 2054 else
8318d78a 2055 sta->txrate_idx = i;
b481de9c
ZY		 2056
2057 return;
2058}
2059
2060
c79dd5b5 2061static void rs_initialize_lq(struct iwl_priv *priv,
270243a5 2062 struct ieee80211_conf *conf,
b481de9c
ZY		 2063 struct sta_info *sta)
2064{
c33104f0 2065 struct iwl4965_lq_sta *lq_sta;
bb8c093b 2066 struct iwl4965_scale_tbl_info *tbl;
b481de9c 2067 int rate_idx;
aade00ce 2068 int i;
39e88504 2069 u32 rate;
aade00ce
GC		 2070 u8 use_green = rs_use_green(priv, conf);
2071 u8 active_tbl = 0;
2072 u8 valid_tx_ant;
b481de9c
ZY		 2073
2074 if (!sta || !sta->rate_ctrl_priv)
2075 goto out;
2076
c33104f0 2077 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
8318d78a 2078 i = sta->last_txrate_idx;
b481de9c 2079
c33104f0 2080 if ((lq_sta->lq.sta_id == 0xff) &&
b481de9c
ZY		 2081 (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
2082 goto out;
2083
aade00ce
GC		 2084 valid_tx_ant = priv->hw_params.valid_tx_ant;
2085
c33104f0
TW		 2086 if (!lq_sta->search_better_tbl)
2087 active_tbl = lq_sta->active_tbl;
b481de9c 2088 else
c33104f0 2089 active_tbl = 1 - lq_sta->active_tbl;
b481de9c 2090
c33104f0 2091 tbl = &(lq_sta->lq_info[active_tbl]);
b481de9c
ZY		 2092
2093 if ((i < 0) || (i >= IWL_RATE_COUNT))
2094 i = 0;
2095
fde0db31 2096 /* FIXME:RS: This is also wrong in 4965 */
39e88504
GC		 2097 rate = iwl4965_rates[i].plcp;
2098 rate |= RATE_MCS_ANT_B_MSK;
2099 rate &= ~RATE_MCS_ANT_A_MSK;
b481de9c
ZY		 2100
2101 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
39e88504 2102 rate |= RATE_MCS_CCK_MSK;
b481de9c 2103
fde0db31 2104 tbl->ant_type = ANT_B;
39e88504 2105 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
aade00ce
GC		 2106 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2107 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
b481de9c 2108
39e88504
GC		 2109 rate = rate_n_flags_from_tbl(tbl, rate_idx, use_green);
2110 tbl->current_rate = rate;
eecd6e57 2111 rs_set_expected_tpt_table(lq_sta, tbl);
39e88504 2112 rs_fill_link_cmd(NULL, lq_sta, rate, &lq_sta->lq);
66c73db7 2113 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
b481de9c
ZY		 2114 out:
2115 return;
2116}
2117
1abbe498 2118static void rs_get_rate(void *priv_rate, struct net_device *dev,
8318d78a
JB		 2119 struct ieee80211_supported_band *sband,
2120 struct sk_buff *skb,
1abbe498 2121 struct rate_selection *sel)
b481de9c
ZY		 2122{
2123
2124 int i;
2125 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
270243a5 2126 struct ieee80211_conf *conf = &local->hw.conf;
b481de9c
ZY		 2127 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2128 struct sta_info *sta;
2bc454b0 2129 u16 fc;
c79dd5b5 2130 struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
c33104f0 2131 struct iwl4965_lq_sta *lq_sta;
b481de9c 2132
58826351 2133 IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
b481de9c 2134
d0709a65
JB		 2135 rcu_read_lock();
2136
b481de9c
ZY		 2137 sta = sta_info_get(local, hdr->addr1);
2138
2bc454b0
MW		 2139 /* Send management frames and broadcast/multicast data using lowest
2140 * rate. */
2141 fc = le16_to_cpu(hdr->frame_control);
2142 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1) ||
2143 !sta || !sta->rate_ctrl_priv) {
8318d78a 2144 sel->rate = rate_lowest(local, sband, sta);
f4d6082d 2145 goto out;
b481de9c
ZY		 2146 }
2147
c33104f0 2148 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
8318d78a 2149 i = sta->last_txrate_idx;
b481de9c 2150
c33104f0
TW		 2151 if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
2152 !lq_sta->ibss_sta_added) {
947b13a7 2153 u8 sta_id = iwl_find_station(priv, hdr->addr1);
0795af57 2154 DECLARE_MAC_BUF(mac);
b481de9c
ZY		 2155
2156 if (sta_id == IWL_INVALID_STATION) {
0795af57
JP		 2157 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2158 print_mac(mac, hdr->addr1));
67d62035
RR		 2159 sta_id = iwl4965_add_station_flags(priv, hdr->addr1,
2160 0, CMD_ASYNC, NULL);
b481de9c
ZY		 2161 }
2162 if ((sta_id != IWL_INVALID_STATION)) {
c33104f0
TW		 2163 lq_sta->lq.sta_id = sta_id;
2164 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2165 lq_sta->ibss_sta_added = 1;
270243a5 2166 rs_initialize_lq(priv, conf, sta);
b481de9c 2167 }
c33104f0 2168 if (!lq_sta->ibss_sta_added)
b481de9c
ZY		 2169 goto done;
2170 }
2171
f4d6082d 2172done:
1abbe498 2173 if ((i < 0) || (i > IWL_RATE_COUNT)) {
8318d78a 2174 sel->rate = rate_lowest(local, sband, sta);
f4d6082d 2175 goto out;
1abbe498 2176 }
b481de9c 2177
1abbe498 2178 sel->rate = &priv->ieee_rates[i];
f4d6082d
TW		 2179out:
2180 rcu_read_unlock();
b481de9c
ZY		 2181}
2182
2183static void *rs_alloc_sta(void *priv, gfp_t gfp)
2184{
c33104f0 2185 struct iwl4965_lq_sta *lq_sta;
b481de9c
ZY		 2186 int i, j;
2187
2188 IWL_DEBUG_RATE("create station rate scale window\n");
2189
c33104f0 2190 lq_sta = kzalloc(sizeof(struct iwl4965_lq_sta), gfp);
b481de9c 2191
c33104f0 2192 if (lq_sta == NULL)
b481de9c 2193 return NULL;
c33104f0 2194 lq_sta->lq.sta_id = 0xff;
b481de9c 2195
63fddb9f 2196
b481de9c
ZY		 2197 for (j = 0; j < LQ_SIZE; j++)
2198 for (i = 0; i < IWL_RATE_COUNT; i++)
c33104f0 2199 rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
b481de9c 2200
c33104f0 2201 return lq_sta;
b481de9c
ZY		 2202}
2203
2204static void rs_rate_init(void *priv_rate, void *priv_sta,
2205 struct ieee80211_local *local,
2206 struct sta_info *sta)
2207{
2208 int i, j;
270243a5 2209 struct ieee80211_conf *conf = &local->hw.conf;
8318d78a 2210 struct ieee80211_supported_band *sband;
c79dd5b5 2211 struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
c33104f0 2212 struct iwl4965_lq_sta *lq_sta = priv_sta;
b481de9c 2213
8318d78a
JB		 2214 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2215
c33104f0 2216 lq_sta->flush_timer = 0;
8318d78a
JB		 2217 lq_sta->supp_rates = sta->supp_rates[sband->band];
2218 sta->txrate_idx = 3;
b481de9c
ZY		 2219 for (j = 0; j < LQ_SIZE; j++)
2220 for (i = 0; i < IWL_RATE_COUNT; i++)
c33104f0 2221 rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
b481de9c
ZY		 2222
2223 IWL_DEBUG_RATE("rate scale global init\n");
2224 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2225 * the lowest or the highest rate.. Could consider using RSSI from
2226 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2227 * after assoc.. */
2228
c33104f0 2229 lq_sta->ibss_sta_added = 0;
b481de9c 2230 if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
947b13a7 2231 u8 sta_id = iwl_find_station(priv, sta->addr);
0795af57
JP		 2232 DECLARE_MAC_BUF(mac);
2233
b481de9c 2234 /* for IBSS the call are from tasklet */
eecd6e57 2235 IWL_DEBUG_RATE("LQ: ADD station %s\n",
0795af57 2236 print_mac(mac, sta->addr));
b481de9c
ZY		 2237
2238 if (sta_id == IWL_INVALID_STATION) {
0795af57
JP		 2239 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2240 print_mac(mac, sta->addr));
67d62035
RR		 2241 sta_id = iwl4965_add_station_flags(priv, sta->addr,
2242 0, CMD_ASYNC, NULL);
b481de9c
ZY		 2243 }
2244 if ((sta_id != IWL_INVALID_STATION)) {
c33104f0
TW		 2245 lq_sta->lq.sta_id = sta_id;
2246 lq_sta->lq.rs_table[0].rate_n_flags = 0;
b481de9c
ZY		 2247 }
2248 /* FIXME: this is w/a remove it later */
2249 priv->assoc_station_added = 1;
2250 }
2251
77626355 2252 /* Find highest tx rate supported by hardware and destination station */
8318d78a
JB		 2253 for (i = 0; i < sband->n_bitrates; i++)
2254 if (sta->supp_rates[sband->band] & BIT(i))
2255 sta->txrate_idx = i;
2256
2257 sta->last_txrate_idx = sta->txrate_idx;
2258 /* WTF is with this bogus comment? A doesn't have cck rates */
77626355 2259 /* For MODE_IEEE80211A, cck rates are at end of rate table */
8318d78a
JB		 2260 if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
2261 sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
b481de9c 2262
c33104f0 2263 lq_sta->is_dup = 0;
c33104f0 2264 lq_sta->is_green = rs_use_green(priv, conf);
39e88504 2265 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
c33104f0 2266 lq_sta->active_rate_basic = priv->active_rate_basic;
8318d78a 2267 lq_sta->band = priv->band;
c8b0e6e1 2268#ifdef CONFIG_IWL4965_HT
77626355
BC		 2269 /*
2270 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2271 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2272 */
fde0db31
GC		 2273 lq_sta->active_siso_rate =
2274 priv->current_ht_config.supp_mcs_set[0] << 1;
c33104f0 2275 lq_sta->active_siso_rate |=
fde0db31 2276 priv->current_ht_config.supp_mcs_set[0] & 0x1;
c33104f0 2277 lq_sta->active_siso_rate &= ~((u16)0x2);
fde0db31 2278 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
b481de9c 2279
77626355 2280 /* Same here */
fde0db31
GC		 2281 lq_sta->active_mimo2_rate =
2282 priv->current_ht_config.supp_mcs_set[1] << 1;
2283 lq_sta->active_mimo2_rate |=
2284 priv->current_ht_config.supp_mcs_set[1] & 0x1;
2285 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2286 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2287
2288 lq_sta->active_mimo3_rate =
2289 priv->current_ht_config.supp_mcs_set[2] << 1;
2290 lq_sta->active_mimo3_rate |=
2291 priv->current_ht_config.supp_mcs_set[2] & 0x1;
2292 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2293 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2294
eecd6e57 2295 IWL_DEBUG_RATE("SISO RATE %X MIMO2 RATE %X MIMO3 RATE %X\n",
c33104f0 2296 lq_sta->active_siso_rate,
fde0db31
GC		 2297 lq_sta->active_mimo2_rate,
2298 lq_sta->active_mimo3_rate);
2299
0c11b4de
RR		 2300 /* as default allow aggregation for all tids */
2301 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
c8b0e6e1 2302#endif /*CONFIG_IWL4965_HT*/
98d7e09a 2303#ifdef CONFIG_MAC80211_DEBUGFS
c33104f0 2304 lq_sta->drv = priv;
98d7e09a 2305#endif
b481de9c
ZY		 2306
2307 if (priv->assoc_station_added)
2308 priv->lq_mngr.lq_ready = 1;
2309
270243a5 2310 rs_initialize_lq(priv, conf, sta);
b481de9c
ZY		 2311}
2312
fde0db31
GC		 2313static void rs_fill_link_cmd(const struct iwl_priv *priv,
2314 struct iwl4965_lq_sta *lq_sta,
39e88504 2315 u32 new_rate,
fde0db31 2316 struct iwl_link_quality_cmd *lq_cmd)
b481de9c 2317{
aade00ce 2318 struct iwl4965_scale_tbl_info tbl_type;
b481de9c 2319 int index = 0;
b481de9c 2320 int rate_idx;
1b696de2 2321 int repeat_rate = 0;
aade00ce 2322 u8 ant_toggle_cnt = 0;
b481de9c 2323 u8 use_ht_possible = 1;
aade00ce 2324 u8 valid_tx_ant = 0;
b481de9c 2325
77626355 2326 /* Override starting rate (index 0) if needed for debug purposes */
39e88504 2327 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
98d7e09a 2328
39e88504 2329 /* Interpret new_rate (rate_n_flags) */
aade00ce 2330 memset(&tbl_type, 0, sizeof(tbl_type));
39e88504 2331 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
b481de9c
ZY		 2332 &tbl_type, &rate_idx);
2333
77626355 2334 /* How many times should we repeat the initial rate? */
b481de9c 2335 if (is_legacy(tbl_type.lq_type)) {
aade00ce 2336 ant_toggle_cnt = 1;
1b696de2 2337 repeat_rate = IWL_NUMBER_TRY;
aade00ce 2338 } else {
1b696de2 2339 repeat_rate = IWL_HT_NUMBER_TRY;
aade00ce 2340 }
b481de9c
ZY		 2341
2342 lq_cmd->general_params.mimo_delimiter =
2343 is_mimo(tbl_type.lq_type) ? 1 : 0;
77626355
BC		 2344
2345 /* Fill 1st table entry (index 0) */
39e88504 2346 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
b481de9c 2347
fde0db31
GC		 2348 /*FIXME:RS*/
2349 if (is_mimo(tbl_type.lq_type) || (tbl_type.ant_type == ANT_A))
77626355
BC		 2350 lq_cmd->general_params.single_stream_ant_msk
2351 = LINK_QUAL_ANT_A_MSK;
b481de9c 2352 else
77626355
BC		 2353 lq_cmd->general_params.single_stream_ant_msk
2354 = LINK_QUAL_ANT_B_MSK;
b481de9c
ZY		 2355
2356 index++;
1b696de2 2357 repeat_rate--;
b481de9c 2358
aade00ce
GC		 2359 if (priv)
2360 valid_tx_ant = priv->hw_params.valid_tx_ant;
2361
77626355 2362 /* Fill rest of rate table */
b481de9c 2363 while (index < LINK_QUAL_MAX_RETRY_NUM) {
77626355
BC		 2364 /* Repeat initial/next rate.
2365 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2366 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
1b696de2 2367 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
b481de9c 2368 if (is_legacy(tbl_type.lq_type)) {
aade00ce
GC		 2369 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2370 ant_toggle_cnt++;
2371 else if (priv &&
2372 rs_toggle_antenna(valid_tx_ant,
2373 &new_rate, &tbl_type))
2374 ant_toggle_cnt = 1;
2375}
98d7e09a 2376
77626355 2377 /* Override next rate if needed for debug purposes */
c33104f0 2378 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
77626355
BC		 2379
2380 /* Fill next table entry */
b481de9c 2381 lq_cmd->rs_table[index].rate_n_flags =
39e88504 2382 cpu_to_le32(new_rate);
1b696de2 2383 repeat_rate--;
b481de9c
ZY		 2384 index++;
2385 }
2386
39e88504 2387 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
b481de9c
ZY		 2388 &rate_idx);
2389
77626355
BC		 2390 /* Indicate to uCode which entries might be MIMO.
2391 * If initial rate was MIMO, this will finally end up
2392 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
b481de9c
ZY		 2393 if (is_mimo(tbl_type.lq_type))
2394 lq_cmd->general_params.mimo_delimiter = index;
2395
77626355 2396 /* Get next rate */
39e88504
GC		 2397 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2398 use_ht_possible);
b481de9c 2399
77626355 2400 /* How many times should we repeat the next rate? */
b481de9c 2401 if (is_legacy(tbl_type.lq_type)) {
aade00ce
GC		 2402 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2403 ant_toggle_cnt++;
2404 else if (priv &&
2405 rs_toggle_antenna(valid_tx_ant,
2406 &new_rate, &tbl_type))
2407 ant_toggle_cnt = 1;
2408
1b696de2 2409 repeat_rate = IWL_NUMBER_TRY;
aade00ce 2410 } else {
1b696de2 2411 repeat_rate = IWL_HT_NUMBER_TRY;
aade00ce 2412 }
b481de9c 2413
77626355
BC		 2414 /* Don't allow HT rates after next pass.
2415 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
b481de9c
ZY		 2416 use_ht_possible = 0;
2417
77626355 2418 /* Override next rate if needed for debug purposes */
c33104f0 2419 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
77626355
BC		 2420
2421 /* Fill next table entry */
39e88504 2422 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
b481de9c
ZY		 2423
2424 index++;
1b696de2 2425 repeat_rate--;
b481de9c
ZY		 2426 }
2427
b481de9c
ZY		 2428 lq_cmd->general_params.dual_stream_ant_msk = 3;
2429 lq_cmd->agg_params.agg_dis_start_th = 3;
2430 lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
b481de9c
ZY		 2431}
2432
2433static void *rs_alloc(struct ieee80211_local *local)
2434{
2435 return local->hw.priv;
2436}
2437/* rate scale requires free function to be implemented */
2438static void rs_free(void *priv_rate)
2439{
2440 return;
2441}
2442
2443static void rs_clear(void *priv_rate)
2444{
c79dd5b5 2445 struct iwl_priv *priv = (struct iwl_priv *) priv_rate;
b481de9c
ZY		 2446
2447 IWL_DEBUG_RATE("enter\n");
2448
2449 priv->lq_mngr.lq_ready = 0;
b481de9c
ZY		 2450
2451 IWL_DEBUG_RATE("leave\n");
2452}
2453
2454static void rs_free_sta(void *priv, void *priv_sta)
2455{
c33104f0 2456 struct iwl4965_lq_sta *lq_sta = priv_sta;
b481de9c
ZY		 2457
2458 IWL_DEBUG_RATE("enter\n");
c33104f0 2459 kfree(lq_sta);
b481de9c
ZY		 2460 IWL_DEBUG_RATE("leave\n");
2461}
2462
2463
93dc646a 2464#ifdef CONFIG_MAC80211_DEBUGFS
5ae212c9
ZY		 2465static int open_file_generic(struct inode *inode, struct file *file)
2466{
2467 file->private_data = inode->i_private;
2468 return 0;
2469}
c33104f0 2470static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
39e88504 2471 u32 *rate_n_flags, int index)
98d7e09a 2472{
39e88504
GC		 2473 if (lq_sta->dbg_fixed_rate) {
2474 if (index < 12) {
2475 *rate_n_flags = lq_sta->dbg_fixed_rate;
2476 } else {
2477 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2478 *rate_n_flags = 0x800D;
2479 else
2480 *rate_n_flags = 0x820A;
2481 }
98d7e09a 2482 IWL_DEBUG_RATE("Fixed rate ON\n");
39e88504
GC		 2483 } else {
2484 IWL_DEBUG_RATE("Fixed rate OFF\n");
98d7e09a 2485 }
98d7e09a 2486}
5ae212c9 2487
98d7e09a
ZY		 2488static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2489 const char __user *user_buf, size_t count, loff_t *ppos)
2490{
c33104f0 2491 struct iwl4965_lq_sta *lq_sta = file->private_data;
98d7e09a
ZY		 2492 char buf[64];
2493 int buf_size;
2494 u32 parsed_rate;
2495
2496 memset(buf, 0, sizeof(buf));
2497 buf_size = min(count, sizeof(buf) - 1);
2498 if (copy_from_user(buf, user_buf, buf_size))
2499 return -EFAULT;
2500
2501 if (sscanf(buf, "%x", &parsed_rate) == 1)
39e88504 2502 lq_sta->dbg_fixed_rate = parsed_rate;
98d7e09a 2503 else
39e88504 2504 lq_sta->dbg_fixed_rate = 0;
98d7e09a 2505
39e88504
GC		 2506 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2507 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2508 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2509 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
98d7e09a
ZY		 2510
2511 IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
39e88504 2512 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
98d7e09a 2513
39e88504
GC		 2514 if (lq_sta->dbg_fixed_rate) {
2515 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate,
2516 &lq_sta->lq);
66c73db7 2517 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
98d7e09a
ZY		 2518 }
2519
2520 return count;
2521}
0209dc11 2522
5ae212c9
ZY		 2523static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2524 char __user *user_buf, size_t count, loff_t *ppos)
2525{
2526 char buff[1024];
2527 int desc = 0;
2528 int i = 0;
2529
c33104f0 2530 struct iwl4965_lq_sta *lq_sta = file->private_data;
5ae212c9 2531
c33104f0 2532 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
98d7e09a 2533 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
c33104f0 2534 lq_sta->total_failed, lq_sta->total_success,
39e88504 2535 lq_sta->active_legacy_rate);
98d7e09a 2536 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
39e88504 2537 lq_sta->dbg_fixed_rate);
5ae212c9
ZY		 2538 desc += sprintf(buff+desc, "general:"
2539 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
c33104f0
TW		 2540 lq_sta->lq.general_params.flags,
2541 lq_sta->lq.general_params.mimo_delimiter,
2542 lq_sta->lq.general_params.single_stream_ant_msk,
2543 lq_sta->lq.general_params.dual_stream_ant_msk);
5ae212c9
ZY		 2544
2545 desc += sprintf(buff+desc, "agg:"
2546 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
c33104f0
TW		 2547 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2548 lq_sta->lq.agg_params.agg_dis_start_th,
2549 lq_sta->lq.agg_params.agg_frame_cnt_limit);
5ae212c9
ZY		 2550
2551 desc += sprintf(buff+desc,
2552 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
c33104f0
TW		 2553 lq_sta->lq.general_params.start_rate_index[0],
2554 lq_sta->lq.general_params.start_rate_index[1],
2555 lq_sta->lq.general_params.start_rate_index[2],
2556 lq_sta->lq.general_params.start_rate_index[3]);
5ae212c9
ZY		 2557
2558
2559 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2560 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
c33104f0 2561 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
5ae212c9
ZY		 2562
2563 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2564}
2565
2566static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
98d7e09a 2567 .write = rs_sta_dbgfs_scale_table_write,
5ae212c9
ZY		 2568 .read = rs_sta_dbgfs_scale_table_read,
2569 .open = open_file_generic,
2570};
0209dc11
ZY		 2571static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2572 char __user *user_buf, size_t count, loff_t *ppos)
2573{
2574 char buff[1024];
2575 int desc = 0;
2576 int i, j;
2577
c33104f0 2578 struct iwl4965_lq_sta *lq_sta = file->private_data;
0209dc11
ZY		 2579 for (i = 0; i < LQ_SIZE; i++) {
2580 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2581 "rate=0x%X\n",
c33104f0
TW		 2582 lq_sta->active_tbl == i?"*":"x",
2583 lq_sta->lq_info[i].lq_type,
2584 lq_sta->lq_info[i].is_SGI,
2585 lq_sta->lq_info[i].is_fat,
2586 lq_sta->lq_info[i].is_dup,
39e88504 2587 lq_sta->lq_info[i].current_rate);
0209dc11
ZY		 2588 for (j = 0; j < IWL_RATE_COUNT; j++) {
2589 desc += sprintf(buff+desc,
c33104f0
TW		 2590 "counter=%d success=%d %%=%d\n",
2591 lq_sta->lq_info[i].win[j].counter,
2592 lq_sta->lq_info[i].win[j].success_counter,
2593 lq_sta->lq_info[i].win[j].success_ratio);
0209dc11
ZY		 2594 }
2595 }
2596 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2597}
2598
2599static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2600 .read = rs_sta_dbgfs_stats_table_read,
2601 .open = open_file_generic,
2602};
5ae212c9 2603
93dc646a
ZY		 2604static void rs_add_debugfs(void *priv, void *priv_sta,
2605 struct dentry *dir)
2606{
c33104f0
TW		 2607 struct iwl4965_lq_sta *lq_sta = priv_sta;
2608 lq_sta->rs_sta_dbgfs_scale_table_file =
0209dc11 2609 debugfs_create_file("rate_scale_table", 0600, dir,
c33104f0
TW		 2610 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2611 lq_sta->rs_sta_dbgfs_stats_table_file =
0209dc11 2612 debugfs_create_file("rate_stats_table", 0600, dir,
c33104f0 2613 lq_sta, &rs_sta_dbgfs_stats_table_ops);
0c11b4de
RR		 2614#ifdef CONFIG_IWL4965_HT
2615 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2616 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
2617 &lq_sta->tx_agg_tid_en);
2618#endif
2619
93dc646a
ZY		 2620}
2621
2622static void rs_remove_debugfs(void *priv, void *priv_sta)
2623{
c33104f0
TW		 2624 struct iwl4965_lq_sta *lq_sta = priv_sta;
2625 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2626 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
0c11b4de
RR		 2627#ifdef CONFIG_IWL4965_HT
2628 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2629#endif
93dc646a
ZY		 2630}
2631#endif
2632
b481de9c
ZY		 2633static struct rate_control_ops rs_ops = {
2634 .module = NULL,
2635 .name = RS_NAME,
2636 .tx_status = rs_tx_status,
2637 .get_rate = rs_get_rate,
2638 .rate_init = rs_rate_init,
2639 .clear = rs_clear,
2640 .alloc = rs_alloc,
2641 .free = rs_free,
2642 .alloc_sta = rs_alloc_sta,
2643 .free_sta = rs_free_sta,
93dc646a
ZY		 2644#ifdef CONFIG_MAC80211_DEBUGFS
2645 .add_sta_debugfs = rs_add_debugfs,
2646 .remove_sta_debugfs = rs_remove_debugfs,
2647#endif
b481de9c
ZY		 2648};
2649
bb8c093b 2650int iwl4965_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id)
b481de9c
ZY		 2651{
2652 struct ieee80211_local *local = hw_to_local(hw);
c79dd5b5 2653 struct iwl_priv *priv = hw->priv;
c33104f0 2654 struct iwl4965_lq_sta *lq_sta;
b481de9c 2655 struct sta_info *sta;
c33104f0 2656 int cnt = 0, i;
b481de9c
ZY		 2657 u32 samples = 0, success = 0, good = 0;
2658 unsigned long now = jiffies;
2659 u32 max_time = 0;
2660 u8 lq_type, antenna;
2661
d0709a65
JB		 2662 rcu_read_lock();
2663
b481de9c
ZY		 2664 sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
2665 if (!sta || !sta->rate_ctrl_priv) {
d0709a65 2666 if (sta)
b481de9c 2667 IWL_DEBUG_RATE("leave - no private rate data!\n");
d0709a65 2668 else
b481de9c 2669 IWL_DEBUG_RATE("leave - no station!\n");
d0709a65 2670 rcu_read_unlock();
b481de9c
ZY		 2671 return sprintf(buf, "station %d not found\n", sta_id);
2672 }
2673
c33104f0 2674 lq_sta = (void *)sta->rate_ctrl_priv;
b481de9c 2675
c33104f0 2676 lq_type = lq_sta->lq_info[lq_sta->active_tbl].lq_type;
fde0db31 2677 antenna = lq_sta->lq_info[lq_sta->active_tbl].ant_type;
b481de9c
ZY		 2678
2679 if (is_legacy(lq_type))
2680 i = IWL_RATE_54M_INDEX;
2681 else
2682 i = IWL_RATE_60M_INDEX;
2683 while (1) {
2684 u64 mask;
2685 int j;
c33104f0 2686 int active = lq_sta->active_tbl;
b481de9c 2687
c33104f0
TW		 2688 cnt +=
2689 sprintf(&buf[cnt], " %2dMbs: ", iwl4965_rates[i].ieee / 2);
b481de9c
ZY		 2690
2691 mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1));
2692 for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1)
c33104f0
TW		 2693 buf[cnt++] =
2694 (lq_sta->lq_info[active].win[i].data & mask)
b481de9c
ZY		 2695 ? '1' : '0';
2696
c33104f0
TW		 2697 samples += lq_sta->lq_info[active].win[i].counter;
2698 good += lq_sta->lq_info[active].win[i].success_counter;
2699 success += lq_sta->lq_info[active].win[i].success_counter *
bb8c093b 2700 iwl4965_rates[i].ieee;
b481de9c 2701
c33104f0 2702 if (lq_sta->lq_info[active].win[i].stamp) {
b481de9c
ZY		 2703 int delta =
2704 jiffies_to_msecs(now -
c33104f0 2705 lq_sta->lq_info[active].win[i].stamp);
b481de9c
ZY		 2706
2707 if (delta > max_time)
2708 max_time = delta;
2709
c33104f0 2710 cnt += sprintf(&buf[cnt], "%5dms\n", delta);
b481de9c 2711 } else
c33104f0 2712 buf[cnt++] = '\n';
b481de9c 2713
bb8c093b 2714 j = iwl4965_get_prev_ieee_rate(i);
b481de9c
ZY		 2715 if (j == i)
2716 break;
2717 i = j;
2718 }
2719
2720 /* Display the average rate of all samples taken.
2721 *
77626355 2722 * NOTE: We multiply # of samples by 2 since the IEEE measurement
bb8c093b 2723 * added from iwl4965_rates is actually 2X the rate */
b481de9c 2724 if (samples)
c33104f0 2725 cnt += sprintf(&buf[cnt],
b481de9c
ZY		 2726 "\nAverage rate is %3d.%02dMbs over last %4dms\n"
2727 "%3d%% success (%d good packets over %d tries)\n",
2728 success / (2 * samples), (success * 5 / samples) % 10,
2729 max_time, good * 100 / samples, good, samples);
2730 else
c33104f0
TW		 2731 cnt += sprintf(&buf[cnt], "\nAverage rate: 0Mbs\n");
2732
2733 cnt += sprintf(&buf[cnt], "\nrate scale type %d antenna %d "
b481de9c 2734 "active_search %d rate index %d\n", lq_type, antenna,
8318d78a 2735 lq_sta->search_better_tbl, sta->last_txrate_idx);
b481de9c 2736
d0709a65 2737 rcu_read_unlock();
c33104f0 2738 return cnt;
b481de9c
ZY		 2739}
2740
bb8c093b 2741void iwl4965_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
b481de9c 2742{
c79dd5b5 2743 struct iwl_priv *priv = hw->priv;
b481de9c
ZY		 2744
2745 priv->lq_mngr.lq_ready = 1;
2746}
2747
897e1cf2 2748int iwl4965_rate_control_register(void)
b481de9c 2749{
897e1cf2 2750 return ieee80211_rate_control_register(&rs_ops);
b481de9c
ZY		 2751}
2752
897e1cf2 2753void iwl4965_rate_control_unregister(void)
b481de9c
ZY		 2754{
2755 ieee80211_rate_control_unregister(&rs_ops);
2756}
2757
Linux 6.x block layer and io_uring tree(s)