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