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iwlwifi: rate scale module cleanups
[mirror_ubuntu-zesty-kernel.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
46#define NUM_TRY_BEFORE_ANTENNA_TOGGLE 1
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
77626355
BC		 67/**
68 * struct iwl4965_rate_scale_data -- tx success history for one rate
69 */
bb8c093b 70struct iwl4965_rate_scale_data {
77626355
BC		 71 u64 data; /* bitmap of successful frames */
72 s32 success_counter; /* number of frames successful */
73 s32 success_ratio; /* per-cent * 128 */
74 s32 counter; /* number of frames attempted */
75 s32 average_tpt; /* success ratio * expected throughput */
b481de9c
ZY		 76 unsigned long stamp;
77};
78
77626355
BC		 79/**
80 * struct iwl4965_scale_tbl_info -- tx params and success history for all rates
81 *
0c11b4de 82 * There are two of these in struct iwl4965_lq_sta,
77626355
BC		 83 * one for "active", and one for "search".
84 */
bb8c093b 85struct iwl4965_scale_tbl_info {
fde0db31
GC		 86 enum iwl_table_type lq_type;
87 u8 ant_type;
77626355
BC		 88 u8 is_SGI; /* 1 = short guard interval */
89 u8 is_fat; /* 1 = 40 MHz channel width */
90 u8 is_dup; /* 1 = duplicated data streams */
91 u8 action; /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
92 s32 *expected_tpt; /* throughput metrics; expected_tpt_G, etc. */
39e88504 93 u32 current_rate; /* rate_n_flags, uCode API format */
77626355 94 struct iwl4965_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
b481de9c
ZY		 95};
96
0c11b4de
RR		 97#ifdef CONFIG_IWL4965_HT
98
99struct iwl4965_traffic_load {
100 unsigned long time_stamp; /* age of the oldest statistics */
101 u32 packet_count[TID_QUEUE_MAX_SIZE]; /* packet count in this time
102 * slice */
103 u32 total; /* total num of packets during the
104 * last TID_MAX_TIME_DIFF */
105 u8 queue_count; /* number of queues that has
106 * been used since the last cleanup */
107 u8 head; /* start of the circular buffer */
108};
109
110#endif /* CONFIG_IWL4965_HT */
111
77626355 112/**
0c11b4de 113 * struct iwl4965_lq_sta -- driver's rate scaling private structure
77626355
BC		 114 *
115 * Pointer to this gets passed back and forth between driver and mac80211.
116 */
c33104f0 117struct iwl4965_lq_sta {
77626355
BC		 118 u8 active_tbl; /* index of active table, range 0-1 */
119 u8 enable_counter; /* indicates HT mode */
120 u8 stay_in_tbl; /* 1: disallow, 0: allow search for new mode */
121 u8 search_better_tbl; /* 1: currently trying alternate mode */
b481de9c 122 s32 last_tpt;
77626355
BC		 123
124 /* The following determine when to search for a new mode */
b481de9c 125 u32 table_count_limit;
77626355
BC		 126 u32 max_failure_limit; /* # failed frames before new search */
127 u32 max_success_limit; /* # successful frames before new search */
b481de9c 128 u32 table_count;
77626355
BC		 129 u32 total_failed; /* total failed frames, any/all rates */
130 u32 total_success; /* total successful frames, any/all rates */
131 u32 flush_timer; /* time staying in mode before new search */
132
133 u8 action_counter; /* # mode-switch actions tried */
b481de9c
ZY		 134 u8 antenna;
135 u8 valid_antenna;
136 u8 is_green;
137 u8 is_dup;
8318d78a 138 enum ieee80211_band band;
b481de9c 139 u8 ibss_sta_added;
77626355
BC		 140
141 /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
02dede04 142 u32 supp_rates;
39e88504 143 u16 active_legacy_rate;
b481de9c 144 u16 active_siso_rate;
fde0db31
GC		 145 u16 active_mimo2_rate;
146 u16 active_mimo3_rate;
b481de9c 147 u16 active_rate_basic;
77626355 148
66c73db7 149 struct iwl_link_quality_cmd lq;
77626355 150 struct iwl4965_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
0c11b4de
RR		 151#ifdef CONFIG_IWL4965_HT
152 struct iwl4965_traffic_load load[TID_MAX_LOAD_COUNT];
153 u8 tx_agg_tid_en;
154#endif
5ae212c9 155#ifdef CONFIG_MAC80211_DEBUGFS
98d7e09a 156 struct dentry *rs_sta_dbgfs_scale_table_file;
0209dc11 157 struct dentry *rs_sta_dbgfs_stats_table_file;
0c11b4de
RR		 158#ifdef CONFIG_IWL4965_HT
159 struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
160#endif
39e88504 161 u32 dbg_fixed_rate;
c79dd5b5 162 struct iwl_priv *drv;
5ae212c9 163#endif
b481de9c
ZY		 164};
165
c79dd5b5 166static void rs_rate_scale_perform(struct iwl_priv *priv,
b481de9c
ZY		 167 struct net_device *dev,
168 struct ieee80211_hdr *hdr,
169 struct sta_info *sta);
fde0db31
GC		 170static void rs_fill_link_cmd(const struct iwl_priv *priv,
171 struct iwl4965_lq_sta *lq_sta,
39e88504 172 u32 rate_n_flags,
66c73db7 173 struct iwl_link_quality_cmd *tbl);
b481de9c
ZY		 174
175
98d7e09a 176#ifdef CONFIG_MAC80211_DEBUGFS
c33104f0 177static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
39e88504 178 u32 *rate_n_flags, int index);
98d7e09a 179#else
c33104f0 180static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
39e88504 181 u32 *rate_n_flags, int index)
98d7e09a
ZY		 182{}
183#endif
77626355
BC		 184
185/*
186 * Expected throughput metrics for following rates:
187 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
188 * "G" is the only table that supports CCK (the first 4 rates).
189 */
fde0db31 190/*FIXME:RS:need to spearate tables for MIMO2/MIMO3*/
b481de9c
ZY		 191static s32 expected_tpt_A[IWL_RATE_COUNT] = {
192 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
193};
194
195static s32 expected_tpt_G[IWL_RATE_COUNT] = {
196 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
197};
198
199static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
200 0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
201};
202
203static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
204 0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
205};
206
207static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
208 0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
209};
210
211static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
212 0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
213};
214
215static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
216 0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
217};
218
219static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
220 0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
221};
222
223static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
224 0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
225};
226
227static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
228 0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
229};
230
39e88504 231static inline u8 rs_extract_rate(u32 rate_n_flags)
b481de9c
ZY		 232{
233 return (u8)(rate_n_flags & 0xFF);
234}
235
bb8c093b 236static void rs_rate_scale_clear_window(struct iwl4965_rate_scale_data *window)
b481de9c
ZY		 237{
238 window->data = 0;
239 window->success_counter = 0;
240 window->success_ratio = IWL_INVALID_VALUE;
241 window->counter = 0;
242 window->average_tpt = IWL_INVALID_VALUE;
243 window->stamp = 0;
b481de9c
ZY		 244}
245
0c11b4de
RR		 246#ifdef CONFIG_IWL4965_HT
247/*
248 * removes the old data from the statistics. All data that is older than
249 * TID_MAX_TIME_DIFF, will be deleted.
250 */
251static void rs_tl_rm_old_stats(struct iwl4965_traffic_load *tl, u32 curr_time)
252{
253 /* The oldest age we want to keep */
254 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
255
256 while (tl->queue_count &&
257 (tl->time_stamp < oldest_time)) {
258 tl->total -= tl->packet_count[tl->head];
259 tl->packet_count[tl->head] = 0;
260 tl->time_stamp += TID_QUEUE_CELL_SPACING;
261 tl->queue_count--;
262 tl->head++;
263 if (tl->head >= TID_QUEUE_MAX_SIZE)
264 tl->head = 0;
265 }
266}
267
268/*
269 * increment traffic load value for tid and also remove
270 * any old values if passed the certain time period
271 */
272static void rs_tl_add_packet(struct iwl4965_lq_sta *lq_data, u8 tid)
273{
274 u32 curr_time = jiffies_to_msecs(jiffies);
275 u32 time_diff;
276 s32 index;
277 struct iwl4965_traffic_load *tl = NULL;
278
279 if (tid >= TID_MAX_LOAD_COUNT)
280 return;
281
282 tl = &lq_data->load[tid];
283
284 curr_time -= curr_time % TID_ROUND_VALUE;
285
286 /* Happens only for the first packet. Initialize the data */
287 if (!(tl->queue_count)) {
288 tl->total = 1;
289 tl->time_stamp = curr_time;
290 tl->queue_count = 1;
291 tl->head = 0;
292 tl->packet_count[0] = 1;
293 return;
294 }
295
296 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
297 index = time_diff / TID_QUEUE_CELL_SPACING;
298
299 /* The history is too long: remove data that is older than */
300 /* TID_MAX_TIME_DIFF */
301 if (index >= TID_QUEUE_MAX_SIZE)
302 rs_tl_rm_old_stats(tl, curr_time);
303
304 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
305 tl->packet_count[index] = tl->packet_count[index] + 1;
306 tl->total = tl->total + 1;
307
308 if ((index + 1) > tl->queue_count)
309 tl->queue_count = index + 1;
310}
311
312/*
313 get the traffic load value for tid
314*/
315static u32 rs_tl_get_load(struct iwl4965_lq_sta *lq_data, u8 tid)
316{
317 u32 curr_time = jiffies_to_msecs(jiffies);
318 u32 time_diff;
319 s32 index;
320 struct iwl4965_traffic_load *tl = NULL;
321
322 if (tid >= TID_MAX_LOAD_COUNT)
323 return 0;
324
325 tl = &(lq_data->load[tid]);
326
327 curr_time -= curr_time % TID_ROUND_VALUE;
328
329 if (!(tl->queue_count))
330 return 0;
331
332 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
333 index = time_diff / TID_QUEUE_CELL_SPACING;
334
335 /* The history is too long: remove data that is older than */
336 /* TID_MAX_TIME_DIFF */
337 if (index >= TID_QUEUE_MAX_SIZE)
338 rs_tl_rm_old_stats(tl, curr_time);
339
340 return tl->total;
341}
342
c79dd5b5 343static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
0c11b4de
RR		 344 struct iwl4965_lq_sta *lq_data, u8 tid,
345 struct sta_info *sta)
346{
347 unsigned long state;
348 DECLARE_MAC_BUF(mac);
349
350 spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
cee24a3e 351 state = sta->ampdu_mlme.tid_state_tx[tid];
0c11b4de
RR		 352 spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
353
354 if (state == HT_AGG_STATE_IDLE &&
355 rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
356 IWL_DEBUG_HT("Starting Tx agg: STA: %s tid: %d\n",
357 print_mac(mac, sta->addr), tid);
358 ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
359 }
360}
361
c79dd5b5 362static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
0c11b4de
RR		 363 struct iwl4965_lq_sta *lq_data,
364 struct sta_info *sta)
365{
366 if ((tid < TID_MAX_LOAD_COUNT))
367 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
368 else if (tid == IWL_AGG_ALL_TID)
369 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
370 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
371}
372
373#endif /* CONFIG_IWLWIFI_HT */
374
39e88504 375static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
fde0db31 376{
39e88504
GC		 377 return (!!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
378 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
379 !!(rate_n_flags & RATE_MCS_ANT_C_MSK));
fde0db31
GC		 380}
381
77626355
BC		 382/**
383 * rs_collect_tx_data - Update the success/failure sliding window
384 *
385 * We keep a sliding window of the last 62 packets transmitted
386 * at this rate. window->data contains the bitmask of successful
387 * packets.
388 */
bb8c093b 389static int rs_collect_tx_data(struct iwl4965_rate_scale_data *windows,
99556438
RR		 390 int scale_index, s32 tpt, int retries,
391 int successes)
b481de9c 392{
bb8c093b 393 struct iwl4965_rate_scale_data *window = NULL;
39e88504 394 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
b481de9c
ZY		 395 s32 fail_count;
396
dc2453ae
TW		 397 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
398 return -EINVAL;
b481de9c 399
77626355 400 /* Select data for current tx bit rate */
b481de9c
ZY		 401 window = &(windows[scale_index]);
402
77626355
BC		 403 /*
404 * Keep track of only the latest 62 tx frame attempts in this rate's
405 * history window; anything older isn't really relevant any more.
406 * If we have filled up the sliding window, drop the oldest attempt;
407 * if the oldest attempt (highest bit in bitmap) shows "success",
408 * subtract "1" from the success counter (this is the main reason
409 * we keep these bitmaps!).
410 */
99556438 411 while (retries > 0) {
39e88504
GC		 412 if (window->counter >= IWL_RATE_MAX_WINDOW) {
413
414 /* remove earliest */
415 window->counter = IWL_RATE_MAX_WINDOW - 1;
416
99556438
RR		 417 if (window->data & mask) {
418 window->data &= ~mask;
39e88504 419 window->success_counter--;
99556438 420 }
b481de9c 421 }
b481de9c 422
99556438
RR		 423 /* Increment frames-attempted counter */
424 window->counter++;
425
426 /* Shift bitmap by one frame (throw away oldest history),
427 * OR in "1", and increment "success" if this
428 * frame was successful. */
39e88504 429 window->data <<= 1;;
99556438 430 if (successes > 0) {
39e88504 431 window->success_counter++;
99556438
RR		 432 window->data |= 0x1;
433 successes--;
434 }
77626355 435
99556438 436 retries--;
b481de9c
ZY		 437 }
438
77626355 439 /* Calculate current success ratio, avoid divide-by-0! */
b481de9c
ZY		 440 if (window->counter > 0)
441 window->success_ratio = 128 * (100 * window->success_counter)
442 / window->counter;
443 else
444 window->success_ratio = IWL_INVALID_VALUE;
445
446 fail_count = window->counter - window->success_counter;
447
77626355 448 /* Calculate average throughput, if we have enough history. */
b481de9c
ZY		 449 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
450 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
451 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
452 else
453 window->average_tpt = IWL_INVALID_VALUE;
454
77626355 455 /* Tag this window as having been updated */
b481de9c
ZY		 456 window->stamp = jiffies;
457
dc2453ae 458 return 0;
b481de9c
ZY		 459}
460
77626355
BC		 461/*
462 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
463 */
39e88504
GC		 464/* FIXME:RS:remove this function and put the flags statically in the table */
465static u32 rate_n_flags_from_tbl(struct iwl4965_scale_tbl_info *tbl,
466 int index, u8 use_green)
b481de9c 467{
39e88504
GC		 468 u32 rate_n_flags = 0;
469
b481de9c 470 if (is_legacy(tbl->lq_type)) {
39e88504 471 rate_n_flags = iwl4965_rates[index].plcp;
b481de9c 472 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
39e88504 473 rate_n_flags |= RATE_MCS_CCK_MSK;
b481de9c 474
fde0db31
GC		 475 } else if (is_Ht(tbl->lq_type)) {
476 if (index > IWL_LAST_OFDM_RATE) {
477 IWL_ERROR("invalid HT rate index %d\n", index);
b481de9c 478 index = IWL_LAST_OFDM_RATE;
fde0db31 479 }
39e88504 480 rate_n_flags = RATE_MCS_HT_MSK;
fde0db31
GC		 481
482 if (is_siso(tbl->lq_type))
39e88504 483 rate_n_flags |= iwl4965_rates[index].plcp_siso;
fde0db31 484 else if (is_mimo2(tbl->lq_type))
39e88504 485 rate_n_flags |= iwl4965_rates[index].plcp_mimo2;
fde0db31 486 else
39e88504 487 rate_n_flags |= iwl4965_rates[index].plcp_mimo3;
b481de9c 488 } else {
fde0db31 489 IWL_ERROR("Invalid tbl->lq_type %d\n", tbl->lq_type);
b481de9c
ZY		 490 }
491
39e88504 492 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
fde0db31 493 RATE_MCS_ANT_ABC_MSK);
b481de9c 494
39e88504
GC		 495 if (is_Ht(tbl->lq_type)) {
496 if (tbl->is_fat) {
497 if (tbl->is_dup)
498 rate_n_flags |= RATE_MCS_DUP_MSK;
499 else
500 rate_n_flags |= RATE_MCS_FAT_MSK;
501 }
502 if (tbl->is_SGI)
503 rate_n_flags |= RATE_MCS_SGI_MSK;
504
505 if (use_green) {
506 rate_n_flags |= RATE_MCS_GF_MSK;
507 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
508 rate_n_flags &= ~RATE_MCS_SGI_MSK;
509 IWL_ERROR("GF was set with SGI:SISO\n");
510 }
511 }
b481de9c 512 }
39e88504 513 return rate_n_flags;
b481de9c
ZY		 514}
515
77626355
BC		 516/*
517 * Interpret uCode API's rate_n_flags format,
518 * fill "search" or "active" tx mode table.
519 */
39e88504 520static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
8318d78a
JB		 521 enum ieee80211_band band,
522 struct iwl4965_scale_tbl_info *tbl,
b481de9c
ZY		 523 int *rate_idx)
524{
39e88504
GC		 525 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
526 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
527 u8 mcs;
b481de9c 528
39e88504 529 *rate_idx = iwl4965_hwrate_to_plcp_idx(rate_n_flags);
b481de9c 530
fde0db31 531 if (*rate_idx == IWL_RATE_INVALID) {
b481de9c 532 *rate_idx = -1;
dc2453ae 533 return -EINVAL;
b481de9c 534 }
77626355 535 tbl->is_SGI = 0; /* default legacy setup */
b481de9c
ZY		 536 tbl->is_fat = 0;
537 tbl->is_dup = 0;
fde0db31
GC		 538 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
539 tbl->lq_type = LQ_NONE;
b481de9c 540
77626355 541 /* legacy rate format */
39e88504 542 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
fde0db31 543 if (num_of_ant == 1) {
8318d78a 544 if (band == IEEE80211_BAND_5GHZ)
b481de9c
ZY		 545 tbl->lq_type = LQ_A;
546 else
547 tbl->lq_type = LQ_G;
b481de9c 548 }
fde0db31 549 /* HT rate format */
b481de9c 550 } else {
39e88504 551 if (rate_n_flags & RATE_MCS_SGI_MSK)
b481de9c
ZY		 552 tbl->is_SGI = 1;
553
39e88504
GC		 554 if ((rate_n_flags & RATE_MCS_FAT_MSK) ||
555 (rate_n_flags & RATE_MCS_DUP_MSK))
b481de9c
ZY		 556 tbl->is_fat = 1;
557
39e88504 558 if (rate_n_flags & RATE_MCS_DUP_MSK)
b481de9c 559 tbl->is_dup = 1;
fde0db31 560
39e88504 561 mcs = rs_extract_rate(rate_n_flags);
fde0db31 562
39e88504
GC		 563 /* SISO */
564 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
fde0db31
GC		 565 if (num_of_ant == 1)
566 tbl->lq_type = LQ_SISO; /*else NONE*/
567 /* MIMO2 */
39e88504 568 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
fde0db31
GC		 569 if (num_of_ant == 2)
570 tbl->lq_type = LQ_MIMO2;
571 /* MIMO3 */
572 } else {
573 if (num_of_ant == 3)
574 tbl->lq_type = LQ_MIMO3;
575 }
b481de9c
ZY		 576 }
577 return 0;
578}
fde0db31 579/* FIXME:RS: need to toggle also ANT_C, and also AB,AC,BC */
39e88504 580static inline void rs_toggle_antenna(u32 *rate_n_flags,
bb8c093b 581 struct iwl4965_scale_tbl_info *tbl)
b481de9c 582{
fde0db31 583 tbl->ant_type ^= ANT_AB;
39e88504 584 *rate_n_flags ^= (RATE_MCS_ANT_A_MSK|RATE_MCS_ANT_B_MSK);
b481de9c
ZY		 585}
586
39e88504 587/* FIXME:RS: in 4965 we don't use greenfield at all */
c79dd5b5 588static inline u8 rs_use_green(struct iwl_priv *priv,
270243a5 589 struct ieee80211_conf *conf)
b481de9c 590{
c8b0e6e1 591#ifdef CONFIG_IWL4965_HT
270243a5
RR		 592 return ((conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) &&
593 priv->current_ht_config.is_green_field &&
594 !priv->current_ht_config.non_GF_STA_present);
39e88504 595#else
dc2453ae 596 return 0;
39e88504 597#endif /* CONFIG_IWL4965_HT */
b481de9c
ZY		 598}
599
600/**
601 * rs_get_supported_rates - get the available rates
602 *
603 * if management frame or broadcast frame only return
604 * basic available rates.
605 *
606 */
eecd6e57 607static u16 rs_get_supported_rates(struct iwl4965_lq_sta *lq_sta,
b481de9c 608 struct ieee80211_hdr *hdr,
eecd6e57 609 enum iwl_table_type rate_type)
b481de9c 610{
eecd6e57
GC		 611 if (hdr && is_multicast_ether_addr(hdr->addr1) &&
612 lq_sta->active_rate_basic)
613 return lq_sta->active_rate_basic;
614
615 if (is_legacy(rate_type)) {
616 return lq_sta->active_legacy_rate;
617 } else {
b481de9c 618 if (is_siso(rate_type))
eecd6e57 619 return lq_sta->active_siso_rate;
fde0db31 620 else if (is_mimo2(rate_type))
eecd6e57 621 return lq_sta->active_mimo2_rate;
b481de9c 622 else
eecd6e57 623 return lq_sta->active_mimo3_rate;
c33104f0 624 }
b481de9c
ZY		 625}
626
627static u16 rs_get_adjacent_rate(u8 index, u16 rate_mask, int rate_type)
628{
629 u8 high = IWL_RATE_INVALID;
630 u8 low = IWL_RATE_INVALID;
631
01ebd063 632 /* 802.11A or ht walks to the next literal adjacent rate in
b481de9c
ZY		 633 * the rate table */
634 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
635 int i;
636 u32 mask;
637
638 /* Find the previous rate that is in the rate mask */
639 i = index - 1;
640 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
641 if (rate_mask & mask) {
642 low = i;
643 break;
644 }
645 }
646
647 /* Find the next rate that is in the rate mask */
648 i = index + 1;
649 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
650 if (rate_mask & mask) {
651 high = i;
652 break;
653 }
654 }
655
656 return (high << 8) | low;
657 }
658
659 low = index;
660 while (low != IWL_RATE_INVALID) {
bb8c093b 661 low = iwl4965_rates[low].prev_rs;
b481de9c
ZY		 662 if (low == IWL_RATE_INVALID)
663 break;
664 if (rate_mask & (1 << low))
665 break;
666 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
667 }
668
669 high = index;
670 while (high != IWL_RATE_INVALID) {
bb8c093b 671 high = iwl4965_rates[high].next_rs;
b481de9c
ZY		 672 if (high == IWL_RATE_INVALID)
673 break;
674 if (rate_mask & (1 << high))
675 break;
676 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
677 }
678
679 return (high << 8) | low;
680}
681
39e88504 682static u32 rs_get_lower_rate(struct iwl4965_lq_sta *lq_sta,
bb8c093b 683 struct iwl4965_scale_tbl_info *tbl, u8 scale_index,
39e88504 684 u8 ht_possible)
b481de9c 685{
b481de9c
ZY		 686 s32 low;
687 u16 rate_mask;
688 u16 high_low;
689 u8 switch_to_legacy = 0;
c33104f0 690 u8 is_green = lq_sta->is_green;
b481de9c
ZY		 691
692 /* check if we need to switch from HT to legacy rates.
693 * assumption is that mandatory rates (1Mbps or 6Mbps)
694 * are always supported (spec demand) */
695 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
696 switch_to_legacy = 1;
697 scale_index = rs_ht_to_legacy[scale_index];
8318d78a 698 if (lq_sta->band == IEEE80211_BAND_5GHZ)
b481de9c
ZY		 699 tbl->lq_type = LQ_A;
700 else
701 tbl->lq_type = LQ_G;
702
fde0db31
GC		 703 if (num_of_ant(tbl->ant_type > 1))
704 tbl->ant_type = ANT_A;/*FIXME:RS*/
b481de9c
ZY		 705
706 tbl->is_fat = 0;
707 tbl->is_SGI = 0;
708 }
709
eecd6e57 710 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
b481de9c 711
77626355 712 /* Mask with station rate restriction */
b481de9c 713 if (is_legacy(tbl->lq_type)) {
77626355 714 /* supp_rates has no CCK bits in A mode */
8318d78a 715 if (lq_sta->band == IEEE80211_BAND_5GHZ)
b481de9c 716 rate_mask = (u16)(rate_mask &
c33104f0 717 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
b481de9c 718 else
c33104f0 719 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
b481de9c
ZY		 720 }
721
77626355 722 /* If we switched from HT to legacy, check current rate */
dc2453ae 723 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
39e88504
GC		 724 low = scale_index;
725 goto out;
b481de9c
ZY		 726 }
727
728 high_low = rs_get_adjacent_rate(scale_index, rate_mask, tbl->lq_type);
729 low = high_low & 0xff;
730
39e88504
GC		 731 if (low == IWL_RATE_INVALID)
732 low = scale_index;
733
734out:
735 return rate_n_flags_from_tbl(tbl, low, is_green);
b481de9c
ZY		 736}
737
77626355
BC		 738/*
739 * mac80211 sends us Tx status
740 */
c33104f0 741static void rs_tx_status(void *priv_rate, struct net_device *dev,
b481de9c
ZY		 742 struct sk_buff *skb,
743 struct ieee80211_tx_status *tx_resp)
744{
745 int status;
746 u8 retries;
747 int rs_index, index = 0;
c33104f0 748 struct iwl4965_lq_sta *lq_sta;
66c73db7 749 struct iwl_link_quality_cmd *table;
b481de9c
ZY		 750 struct sta_info *sta;
751 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
c79dd5b5 752 struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
b481de9c 753 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
4c424e4c 754 struct ieee80211_hw *hw = local_to_hw(local);
bb8c093b
CH		 755 struct iwl4965_rate_scale_data *window = NULL;
756 struct iwl4965_rate_scale_data *search_win = NULL;
39e88504 757 u32 tx_rate;
bb8c093b
CH		 758 struct iwl4965_scale_tbl_info tbl_type;
759 struct iwl4965_scale_tbl_info *curr_tbl, *search_tbl;
b481de9c
ZY		 760 u8 active_index = 0;
761 u16 fc = le16_to_cpu(hdr->frame_control);
762 s32 tpt = 0;
763
58826351 764 IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
b481de9c
ZY		 765
766 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1))
767 return;
768
99556438
RR		 769 /* This packet was aggregated but doesn't carry rate scale info */
770 if ((tx_resp->control.flags & IEEE80211_TXCTL_AMPDU) &&
771 !(tx_resp->flags & IEEE80211_TX_STATUS_AMPDU))
772 return;
773
b481de9c
ZY		 774 retries = tx_resp->retry_count;
775
776 if (retries > 15)
777 retries = 15;
778
d0709a65 779 rcu_read_lock();
b481de9c
ZY		 780
781 sta = sta_info_get(local, hdr->addr1);
782
f4d6082d
TW		 783 if (!sta || !sta->rate_ctrl_priv)
784 goto out;
785
b481de9c 786
c33104f0 787 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
b481de9c
ZY		 788
789 if (!priv->lq_mngr.lq_ready)
f4d6082d 790 goto out;
b481de9c 791
c33104f0
TW		 792 if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
793 !lq_sta->ibss_sta_added)
f4d6082d 794 goto out;
b481de9c 795
c33104f0
TW		 796 table = &lq_sta->lq;
797 active_index = lq_sta->active_tbl;
b481de9c 798
c33104f0 799 lq_sta->antenna = lq_sta->valid_antenna;
77626355 800
c33104f0
TW		 801 curr_tbl = &(lq_sta->lq_info[active_index]);
802 search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
bb8c093b 803 window = (struct iwl4965_rate_scale_data *)
b481de9c 804 &(curr_tbl->win[0]);
bb8c093b 805 search_win = (struct iwl4965_rate_scale_data *)
b481de9c
ZY		 806 &(search_tbl->win[0]);
807
77626355
BC		 808 /*
809 * Ignore this Tx frame response if its initial rate doesn't match
810 * that of latest Link Quality command. There may be stragglers
811 * from a previous Link Quality command, but we're no longer interested
812 * in those; they're either from the "active" mode while we're trying
813 * to check "search" mode, or a prior "search" mode after we've moved
814 * to a new "search" mode (which might become the new "active" mode).
815 */
39e88504
GC		 816 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
817 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
4c424e4c
RR		 818 if (priv->band == IEEE80211_BAND_5GHZ)
819 rs_index -= IWL_FIRST_OFDM_RATE;
820
821 if ((tx_resp->control.tx_rate == NULL) ||
822 (tbl_type.is_SGI ^
823 !!(tx_resp->control.flags & IEEE80211_TXCTL_SHORT_GI)) ||
824 (tbl_type.is_fat ^
825 !!(tx_resp->control.flags & IEEE80211_TXCTL_40_MHZ_WIDTH)) ||
826 (tbl_type.is_dup ^
827 !!(tx_resp->control.flags & IEEE80211_TXCTL_DUP_DATA)) ||
fde0db31 828 (tbl_type.ant_type ^ tx_resp->control.antenna_sel_tx) ||
39e88504 829 (!!(tx_rate & RATE_MCS_HT_MSK) ^
4c424e4c 830 !!(tx_resp->control.flags & IEEE80211_TXCTL_OFDM_HT)) ||
39e88504 831 (!!(tx_rate & RATE_MCS_GF_MSK) ^
4c424e4c
RR		 832 !!(tx_resp->control.flags & IEEE80211_TXCTL_GREEN_FIELD)) ||
833 (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
834 tx_resp->control.tx_rate->bitrate)) {
39e88504 835 IWL_DEBUG_RATE("initial rate does not match 0x%x\n", tx_rate);
f4d6082d 836 goto out;
b481de9c
ZY		 837 }
838
77626355 839 /* Update frame history window with "failure" for each Tx retry. */
b481de9c 840 while (retries) {
77626355
BC		 841 /* Look up the rate and other info used for each tx attempt.
842 * Each tx attempt steps one entry deeper in the rate table. */
39e88504
GC		 843 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
844 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
b481de9c
ZY		 845 &tbl_type, &rs_index);
846
77626355
BC		 847 /* If type matches "search" table,
848 * add failure to "search" history */
b481de9c 849 if ((tbl_type.lq_type == search_tbl->lq_type) &&
fde0db31 850 (tbl_type.ant_type == search_tbl->ant_type) &&
b481de9c
ZY		 851 (tbl_type.is_SGI == search_tbl->is_SGI)) {
852 if (search_tbl->expected_tpt)
853 tpt = search_tbl->expected_tpt[rs_index];
854 else
855 tpt = 0;
99556438 856 rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
77626355
BC		 857
858 /* Else if type matches "current/active" table,
859 * add failure to "current/active" history */
b481de9c 860 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
fde0db31 861 (tbl_type.ant_type == curr_tbl->ant_type) &&
b481de9c
ZY		 862 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
863 if (curr_tbl->expected_tpt)
864 tpt = curr_tbl->expected_tpt[rs_index];
865 else
866 tpt = 0;
99556438 867 rs_collect_tx_data(window, rs_index, tpt, 1, 0);
b481de9c 868 }
77626355
BC		 869
870 /* If not searching for a new mode, increment failed counter
871 * ... this helps determine when to start searching again */
c33104f0
TW		 872 if (lq_sta->stay_in_tbl)
873 lq_sta->total_failed++;
b481de9c
ZY		 874 --retries;
875 index++;
876
877 }
878
77626355
BC		 879 /*
880 * Find (by rate) the history window to update with final Tx attempt;
881 * if Tx was successful first try, use original rate,
882 * else look up the rate that was, finally, successful.
883 */
39e88504
GC		 884 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
885 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
b481de9c 886
77626355 887 /* Update frame history window with "success" if Tx got ACKed ... */
b481de9c
ZY		 888 if (tx_resp->flags & IEEE80211_TX_STATUS_ACK)
889 status = 1;
890 else
891 status = 0;
892
77626355
BC		 893 /* If type matches "search" table,
894 * add final tx status to "search" history */
b481de9c 895 if ((tbl_type.lq_type == search_tbl->lq_type) &&
fde0db31 896 (tbl_type.ant_type == search_tbl->ant_type) &&
b481de9c
ZY		 897 (tbl_type.is_SGI == search_tbl->is_SGI)) {
898 if (search_tbl->expected_tpt)
899 tpt = search_tbl->expected_tpt[rs_index];
900 else
901 tpt = 0;
99556438
RR		 902 if (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU)
903 rs_collect_tx_data(search_win, rs_index, tpt,
904 tx_resp->ampdu_ack_len,
905 tx_resp->ampdu_ack_map);
906 else
907 rs_collect_tx_data(search_win, rs_index, tpt,
908 1, status);
77626355
BC		 909 /* Else if type matches "current/active" table,
910 * add final tx status to "current/active" history */
b481de9c 911 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
fde0db31 912 (tbl_type.ant_type == curr_tbl->ant_type) &&
b481de9c
ZY		 913 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
914 if (curr_tbl->expected_tpt)
915 tpt = curr_tbl->expected_tpt[rs_index];
916 else
917 tpt = 0;
99556438
RR		 918 if (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU)
919 rs_collect_tx_data(window, rs_index, tpt,
920 tx_resp->ampdu_ack_len,
921 tx_resp->ampdu_ack_map);
922 else
923 rs_collect_tx_data(window, rs_index, tpt,
924 1, status);
b481de9c
ZY		 925 }
926
77626355
BC		 927 /* If not searching for new mode, increment success/failed counter
928 * ... these help determine when to start searching again */
c33104f0 929 if (lq_sta->stay_in_tbl) {
99556438
RR		 930 if (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU) {
931 lq_sta->total_success += tx_resp->ampdu_ack_map;
932 lq_sta->total_failed +=
933 (tx_resp->ampdu_ack_len - tx_resp->ampdu_ack_map);
934 } else {
935 if (status)
936 lq_sta->total_success++;
937 else
938 lq_sta->total_failed++;
939 }
b481de9c
ZY		 940 }
941
77626355 942 /* See if there's a better rate or modulation mode to try. */
b481de9c 943 rs_rate_scale_perform(priv, dev, hdr, sta);
f4d6082d 944out:
d0709a65 945 rcu_read_unlock();
b481de9c
ZY		 946 return;
947}
948
fde0db31 949static inline u8 rs_is_ant_connected(u8 valid_antenna, u8 ant_type)
b481de9c 950{
fde0db31 951 return ((ant_type & valid_antenna) == ant_type);
b481de9c
ZY		 952}
953
fde0db31
GC		 954/*FIXME:RS: this function should be replaced*/
955static u8 rs_is_other_ant_connected(u8 valid_antenna, u8 ant_type)
b481de9c 956{
fde0db31
GC		 957 if (ant_type == ANT_B)
958 return rs_is_ant_connected(valid_antenna, ANT_A);
b481de9c 959 else
fde0db31 960 return rs_is_ant_connected(valid_antenna, ANT_B);
b481de9c
ZY		 961
962 return 0;
963}
964
77626355
BC		 965/*
966 * Begin a period of staying with a selected modulation mode.
967 * Set "stay_in_tbl" flag to prevent any mode switches.
968 * Set frame tx success limits according to legacy vs. high-throughput,
969 * and reset overall (spanning all rates) tx success history statistics.
970 * These control how long we stay using same modulation mode before
971 * searching for a new mode.
972 */
b481de9c 973static void rs_set_stay_in_table(u8 is_legacy,
c33104f0 974 struct iwl4965_lq_sta *lq_sta)
b481de9c 975{
eecd6e57 976 IWL_DEBUG_RATE("we are staying in the same table\n");
c33104f0 977 lq_sta->stay_in_tbl = 1; /* only place this gets set */
b481de9c 978 if (is_legacy) {
c33104f0
TW		 979 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
980 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
981 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
b481de9c 982 } else {
c33104f0
TW		 983 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
984 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
985 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
b481de9c 986 }
c33104f0
TW		 987 lq_sta->table_count = 0;
988 lq_sta->total_failed = 0;
989 lq_sta->total_success = 0;
b481de9c
ZY		 990}
991
77626355
BC		 992/*
993 * Find correct throughput table for given mode of modulation
994 */
eecd6e57 995static void rs_set_expected_tpt_table(struct iwl4965_lq_sta *lq_sta,
bb8c093b 996 struct iwl4965_scale_tbl_info *tbl)
b481de9c
ZY		 997{
998 if (is_legacy(tbl->lq_type)) {
999 if (!is_a_band(tbl->lq_type))
1000 tbl->expected_tpt = expected_tpt_G;
1001 else
1002 tbl->expected_tpt = expected_tpt_A;
1003 } else if (is_siso(tbl->lq_type)) {
c33104f0 1004 if (tbl->is_fat && !lq_sta->is_dup)
b481de9c
ZY		 1005 if (tbl->is_SGI)
1006 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
1007 else
1008 tbl->expected_tpt = expected_tpt_siso40MHz;
1009 else if (tbl->is_SGI)
1010 tbl->expected_tpt = expected_tpt_siso20MHzSGI;
1011 else
1012 tbl->expected_tpt = expected_tpt_siso20MHz;
1013
fde0db31 1014 } else if (is_mimo(tbl->lq_type)) { /* FIXME:need to separate mimo2/3 */
c33104f0 1015 if (tbl->is_fat && !lq_sta->is_dup)
b481de9c
ZY		 1016 if (tbl->is_SGI)
1017 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
1018 else
1019 tbl->expected_tpt = expected_tpt_mimo40MHz;
1020 else if (tbl->is_SGI)
1021 tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
1022 else
1023 tbl->expected_tpt = expected_tpt_mimo20MHz;
1024 } else
1025 tbl->expected_tpt = expected_tpt_G;
1026}
1027
c8b0e6e1 1028#ifdef CONFIG_IWL4965_HT
77626355
BC		 1029/*
1030 * Find starting rate for new "search" high-throughput mode of modulation.
1031 * Goal is to find lowest expected rate (under perfect conditions) that is
1032 * above the current measured throughput of "active" mode, to give new mode
1033 * a fair chance to prove itself without too many challenges.
1034 *
1035 * This gets called when transitioning to more aggressive modulation
1036 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1037 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1038 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1039 * bit rate will typically need to increase, but not if performance was bad.
1040 */
c79dd5b5 1041static s32 rs_get_best_rate(struct iwl_priv *priv,
c33104f0 1042 struct iwl4965_lq_sta *lq_sta,
77626355 1043 struct iwl4965_scale_tbl_info *tbl, /* "search" */
b481de9c
ZY		 1044 u16 rate_mask, s8 index, s8 rate)
1045{
77626355 1046 /* "active" values */
bb8c093b 1047 struct iwl4965_scale_tbl_info *active_tbl =
c33104f0 1048 &(lq_sta->lq_info[lq_sta->active_tbl]);
b481de9c 1049 s32 active_sr = active_tbl->win[index].success_ratio;
b481de9c 1050 s32 active_tpt = active_tbl->expected_tpt[index];
77626355
BC		 1051
1052 /* expected "search" throughput */
1053 s32 *tpt_tbl = tbl->expected_tpt;
1054
1055 s32 new_rate, high, low, start_hi;
b481de9c
ZY		 1056 u16 high_low;
1057
1058 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1059
1060 for (; ;) {
1061 high_low = rs_get_adjacent_rate(rate, rate_mask, tbl->lq_type);
1062
1063 low = high_low & 0xff;
1064 high = (high_low >> 8) & 0xff;
1065
77626355
BC		 1066 /*
1067 * Lower the "search" bit rate, to give new "search" mode
1068 * approximately the same throughput as "active" if:
1069 *
1070 * 1) "Active" mode has been working modestly well (but not
1071 * great), and expected "search" throughput (under perfect
1072 * conditions) at candidate rate is above the actual
1073 * measured "active" throughput (but less than expected
1074 * "active" throughput under perfect conditions).
1075 * OR
1076 * 2) "Active" mode has been working perfectly or very well
1077 * and expected "search" throughput (under perfect
1078 * conditions) at candidate rate is above expected
1079 * "active" throughput (under perfect conditions).
1080 */
c33104f0 1081 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
b481de9c
ZY		 1082 ((active_sr > IWL_RATE_DECREASE_TH) &&
1083 (active_sr <= IWL_RATE_HIGH_TH) &&
1084 (tpt_tbl[rate] <= active_tpt))) ||
1085 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1086 (tpt_tbl[rate] > active_tpt))) {
1087
77626355
BC		 1088 /* (2nd or later pass)
1089 * If we've already tried to raise the rate, and are
1090 * now trying to lower it, use the higher rate. */
b481de9c
ZY		 1091 if (start_hi != IWL_RATE_INVALID) {
1092 new_rate = start_hi;
1093 break;
1094 }
77626355 1095
b481de9c 1096 new_rate = rate;
77626355
BC		 1097
1098 /* Loop again with lower rate */
b481de9c
ZY		 1099 if (low != IWL_RATE_INVALID)
1100 rate = low;
77626355
BC		 1101
1102 /* Lower rate not available, use the original */
b481de9c
ZY		 1103 else
1104 break;
77626355
BC		 1105
1106 /* Else try to raise the "search" rate to match "active" */
b481de9c 1107 } else {
77626355
BC		 1108 /* (2nd or later pass)
1109 * If we've already tried to lower the rate, and are
1110 * now trying to raise it, use the lower rate. */
b481de9c
ZY		 1111 if (new_rate != IWL_RATE_INVALID)
1112 break;
77626355
BC		 1113
1114 /* Loop again with higher rate */
b481de9c
ZY		 1115 else if (high != IWL_RATE_INVALID) {
1116 start_hi = high;
1117 rate = high;
77626355
BC		 1118
1119 /* Higher rate not available, use the original */
b481de9c
ZY		 1120 } else {
1121 new_rate = rate;
1122 break;
1123 }
1124 }
1125 }
1126
1127 return new_rate;
1128}
c8b0e6e1 1129#endif /* CONFIG_IWL4965_HT */
b481de9c 1130
fde0db31 1131/*FIXME:RS:this function should be replaced*/
b481de9c
ZY		 1132static inline u8 rs_is_both_ant_supp(u8 valid_antenna)
1133{
fde0db31 1134 return (rs_is_ant_connected(valid_antenna, ANT_AB));
b481de9c
ZY		 1135}
1136
77626355
BC		 1137/*
1138 * Set up search table for MIMO
1139 */
fde0db31
GC		 1140#ifdef CONFIG_IWL4965_HT
1141static int rs_switch_to_mimo2(struct iwl_priv *priv,
c33104f0 1142 struct iwl4965_lq_sta *lq_sta,
270243a5
RR		 1143 struct ieee80211_conf *conf,
1144 struct sta_info *sta,
bb8c093b 1145 struct iwl4965_scale_tbl_info *tbl, int index)
b481de9c 1146{
b481de9c
ZY		 1147 u16 rate_mask;
1148 s32 rate;
c33104f0 1149 s8 is_green = lq_sta->is_green;
b481de9c 1150
270243a5
RR		 1151 if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1152 !sta->ht_info.ht_supported)
b481de9c
ZY		 1153 return -1;
1154
270243a5 1155 if (priv->current_ht_config.tx_mimo_ps_mode == IWL_MIMO_PS_STATIC)
b481de9c
ZY		 1156 return -1;
1157
77626355 1158 /* Need both Tx chains/antennas to support MIMO */
fde0db31 1159 if (!rs_is_both_ant_supp(priv->hw_params.valid_tx_ant))
b481de9c
ZY		 1160 return -1;
1161
eecd6e57 1162 IWL_DEBUG_RATE("LQ: try to switch to MIMO2\n");
39e88504
GC		 1163
1164 tbl->lq_type = LQ_MIMO2;
c33104f0 1165 tbl->is_dup = lq_sta->is_dup;
b481de9c 1166 tbl->action = 0;
39e88504
GC		 1167 rate_mask = lq_sta->active_mimo2_rate;
1168
270243a5 1169 if (priv->current_ht_config.supported_chan_width
39e88504 1170 == IWL_CHANNEL_WIDTH_40MHZ)
b481de9c
ZY		 1171 tbl->is_fat = 1;
1172 else
1173 tbl->is_fat = 0;
1174
39e88504 1175 /* FIXME: - don't toggle SGI here
b481de9c 1176 if (tbl->is_fat) {
270243a5 1177 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
b481de9c
ZY		 1178 tbl->is_SGI = 1;
1179 else
1180 tbl->is_SGI = 0;
270243a5 1181 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
b481de9c
ZY		 1182 tbl->is_SGI = 1;
1183 else
1184 tbl->is_SGI = 0;
39e88504 1185 */
b481de9c 1186
eecd6e57 1187 rs_set_expected_tpt_table(lq_sta, tbl);
b481de9c 1188
c33104f0 1189 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index, index);
b481de9c 1190
eecd6e57 1191 IWL_DEBUG_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
39e88504
GC		 1192
1193 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
eecd6e57 1194 IWL_DEBUG_RATE("Can't switch with index %d rate mask %x\n",
39e88504 1195 rate, rate_mask);
b481de9c 1196 return -1;
39e88504
GC		 1197 }
1198 tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
b481de9c 1199
eecd6e57 1200 IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
39e88504 1201 tbl->current_rate, is_green);
dc2453ae 1202 return 0;
fde0db31 1203}
403ab56b 1204#else
fde0db31
GC		 1205static int rs_switch_to_mimo2(struct iwl_priv *priv,
1206 struct iwl4965_lq_sta *lq_sta,
1207 struct ieee80211_conf *conf,
1208 struct sta_info *sta,
1209 struct iwl4965_scale_tbl_info *tbl, int index)
1210{
403ab56b 1211 return -1;
b481de9c 1212}
fde0db31 1213#endif /*CONFIG_IWL4965_HT */
b481de9c 1214
77626355
BC		 1215/*
1216 * Set up search table for SISO
1217 */
c79dd5b5 1218static int rs_switch_to_siso(struct iwl_priv *priv,
c33104f0 1219 struct iwl4965_lq_sta *lq_sta,
270243a5
RR		 1220 struct ieee80211_conf *conf,
1221 struct sta_info *sta,
bb8c093b 1222 struct iwl4965_scale_tbl_info *tbl, int index)
b481de9c 1223{
c8b0e6e1 1224#ifdef CONFIG_IWL4965_HT
b481de9c 1225 u16 rate_mask;
c33104f0 1226 u8 is_green = lq_sta->is_green;
b481de9c
ZY		 1227 s32 rate;
1228
270243a5
RR		 1229 if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1230 !sta->ht_info.ht_supported)
b481de9c
ZY		 1231 return -1;
1232
eecd6e57 1233 IWL_DEBUG_RATE("LQ: try to switch to SISO\n");
39e88504 1234
c33104f0 1235 tbl->is_dup = lq_sta->is_dup;
b481de9c
ZY		 1236 tbl->lq_type = LQ_SISO;
1237 tbl->action = 0;
39e88504 1238 rate_mask = lq_sta->active_siso_rate;
b481de9c 1239
270243a5
RR		 1240 if (priv->current_ht_config.supported_chan_width
1241 == IWL_CHANNEL_WIDTH_40MHZ)
b481de9c
ZY		 1242 tbl->is_fat = 1;
1243 else
1244 tbl->is_fat = 0;
1245
39e88504 1246 /* FIXME: - don't toggle SGI here
b481de9c 1247 if (tbl->is_fat) {
270243a5 1248 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
b481de9c
ZY		 1249 tbl->is_SGI = 1;
1250 else
1251 tbl->is_SGI = 0;
270243a5 1252 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
b481de9c
ZY		 1253 tbl->is_SGI = 1;
1254 else
1255 tbl->is_SGI = 0;
39e88504 1256 */
b481de9c
ZY		 1257
1258 if (is_green)
39e88504 1259 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
b481de9c 1260
eecd6e57 1261 rs_set_expected_tpt_table(lq_sta, tbl);
c33104f0 1262 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index, index);
b481de9c 1263
eecd6e57 1264 IWL_DEBUG_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask);
b481de9c 1265 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
eecd6e57 1266 IWL_DEBUG_RATE("can not switch with index %d rate mask %x\n",
b481de9c
ZY		 1267 rate, rate_mask);
1268 return -1;
1269 }
39e88504 1270 tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
eecd6e57 1271 IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
39e88504 1272 tbl->current_rate, is_green);
403ab56b
MA		 1273 return 0;
1274#else
1275 return -1;
b481de9c 1276
0c11b4de 1277#endif /*CONFIG_IWL4965_HT */
b481de9c
ZY		 1278}
1279
77626355
BC		 1280/*
1281 * Try to switch to new modulation mode from legacy
1282 */
c79dd5b5 1283static int rs_move_legacy_other(struct iwl_priv *priv,
c33104f0 1284 struct iwl4965_lq_sta *lq_sta,
270243a5
RR		 1285 struct ieee80211_conf *conf,
1286 struct sta_info *sta,
b481de9c
ZY		 1287 int index)
1288{
bb8c093b 1289 struct iwl4965_scale_tbl_info *tbl =
c33104f0 1290 &(lq_sta->lq_info[lq_sta->active_tbl]);
bb8c093b 1291 struct iwl4965_scale_tbl_info *search_tbl =
c33104f0 1292 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
bb8c093b
CH		 1293 struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1294 u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1295 (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
b481de9c 1296 u8 start_action = tbl->action;
fde0db31
GC		 1297 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1298 int ret = 0;
b481de9c
ZY		 1299
1300 for (; ;) {
1301 switch (tbl->action) {
1302 case IWL_LEGACY_SWITCH_ANTENNA:
eecd6e57 1303 IWL_DEBUG_RATE("LQ Legacy toggle Antenna\n");
b481de9c
ZY		 1304
1305 search_tbl->lq_type = LQ_NONE;
c33104f0 1306 lq_sta->action_counter++;
77626355
BC		 1307
1308 /* Don't change antenna if success has been great */
39e88504 1309 /*FIXME:RS:not sure this is really needed*/
b481de9c
ZY		 1310 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1311 break;
77626355
BC		 1312
1313 /* Don't change antenna if other one is not connected */
fde0db31
GC		 1314 if (!rs_is_other_ant_connected(valid_tx_ant,
1315 tbl->ant_type))
b481de9c
ZY		 1316 break;
1317
77626355 1318 /* Set up search table to try other antenna */
b481de9c
ZY		 1319 memcpy(search_tbl, tbl, sz);
1320
39e88504 1321 rs_toggle_antenna(&search_tbl->current_rate,
b481de9c 1322 search_tbl);
eecd6e57 1323 rs_set_expected_tpt_table(lq_sta, search_tbl);
c33104f0 1324 lq_sta->search_better_tbl = 1;
b481de9c
ZY		 1325 goto out;
1326
1327 case IWL_LEGACY_SWITCH_SISO:
eecd6e57 1328 IWL_DEBUG_RATE("LQ: Legacy switch to SISO\n");
77626355
BC		 1329
1330 /* Set up search table to try SISO */
b481de9c 1331 memcpy(search_tbl, tbl, sz);
b481de9c 1332 search_tbl->is_SGI = 0;
c33104f0 1333 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
270243a5 1334 search_tbl, index);
dc2453ae 1335 if (!ret) {
c33104f0
TW		 1336 lq_sta->search_better_tbl = 1;
1337 lq_sta->action_counter = 0;
b481de9c 1338 goto out;
dc2453ae 1339 }
b481de9c
ZY		 1340
1341 break;
fde0db31 1342 case IWL_LEGACY_SWITCH_MIMO2:
eecd6e57 1343 IWL_DEBUG_RATE("LQ: Legacy switch to MIMO2\n");
77626355
BC		 1344
1345 /* Set up search table to try MIMO */
b481de9c 1346 memcpy(search_tbl, tbl, sz);
b481de9c 1347 search_tbl->is_SGI = 0;
fde0db31
GC		 1348 search_tbl->ant_type = ANT_AB;/*FIXME:RS*/
1349 /*FIXME:RS:need to check ant validity*/
1350 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
270243a5 1351 search_tbl, index);
dc2453ae 1352 if (!ret) {
c33104f0
TW		 1353 lq_sta->search_better_tbl = 1;
1354 lq_sta->action_counter = 0;
b481de9c 1355 goto out;
dc2453ae 1356 }
b481de9c
ZY		 1357 break;
1358 }
1359 tbl->action++;
fde0db31 1360 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2)
b481de9c
ZY		 1361 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1362
1363 if (tbl->action == start_action)
1364 break;
1365
1366 }
1367 return 0;
1368
1369 out:
1370 tbl->action++;
fde0db31 1371 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2)
b481de9c
ZY		 1372 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1373 return 0;
1374
1375}
1376
77626355
BC		 1377/*
1378 * Try to switch to new modulation mode from SISO
1379 */
c79dd5b5 1380static int rs_move_siso_to_other(struct iwl_priv *priv,
c33104f0 1381 struct iwl4965_lq_sta *lq_sta,
270243a5
RR		 1382 struct ieee80211_conf *conf,
1383 struct sta_info *sta,
b481de9c
ZY		 1384 int index)
1385{
c33104f0 1386 u8 is_green = lq_sta->is_green;
bb8c093b 1387 struct iwl4965_scale_tbl_info *tbl =
c33104f0 1388 &(lq_sta->lq_info[lq_sta->active_tbl]);
bb8c093b 1389 struct iwl4965_scale_tbl_info *search_tbl =
c33104f0 1390 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
bb8c093b
CH		 1391 struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1392 u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1393 (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
b481de9c 1394 u8 start_action = tbl->action;
fde0db31
GC		 1395 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1396 int ret;
b481de9c
ZY		 1397
1398 for (;;) {
c33104f0 1399 lq_sta->action_counter++;
b481de9c
ZY		 1400 switch (tbl->action) {
1401 case IWL_SISO_SWITCH_ANTENNA:
eecd6e57 1402 IWL_DEBUG_RATE("LQ: SISO toggle Antenna\n");
39e88504 1403 /*FIXME:RS: is this really needed for SISO?*/
b481de9c
ZY		 1404 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1405 break;
fde0db31
GC		 1406 if (!rs_is_other_ant_connected(valid_tx_ant,
1407 tbl->ant_type))
b481de9c
ZY		 1408 break;
1409
1410 memcpy(search_tbl, tbl, sz);
39e88504 1411 rs_toggle_antenna(&search_tbl->current_rate,
b481de9c 1412 search_tbl);
c33104f0 1413 lq_sta->search_better_tbl = 1;
b481de9c
ZY		 1414
1415 goto out;
1416
fde0db31 1417 case IWL_SISO_SWITCH_MIMO2:
eecd6e57 1418 IWL_DEBUG_RATE("LQ: SISO switch to MIMO\n");
b481de9c 1419 memcpy(search_tbl, tbl, sz);
b481de9c 1420 search_tbl->is_SGI = 0;
fde0db31
GC		 1421 search_tbl->ant_type = ANT_AB; /*FIXME:RS*/
1422 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
270243a5 1423 search_tbl, index);
dc2453ae 1424 if (!ret) {
c33104f0 1425 lq_sta->search_better_tbl = 1;
b481de9c 1426 goto out;
dc2453ae 1427 }
b481de9c
ZY		 1428 break;
1429 case IWL_SISO_SWITCH_GI:
eecd6e57 1430 IWL_DEBUG_RATE("LQ: SISO toggle SGI/NGI\n");
0c11b4de 1431
b481de9c 1432 memcpy(search_tbl, tbl, sz);
39e88504
GC		 1433 if (is_green) {
1434 if (!tbl->is_SGI)
1435 break;
1436 else
1437 IWL_ERROR("SGI was set in GF+SISO\n");
b481de9c 1438 }
39e88504 1439 search_tbl->is_SGI = !tbl->is_SGI;
eecd6e57 1440 rs_set_expected_tpt_table(lq_sta, search_tbl);
39e88504
GC		 1441 if (tbl->is_SGI) {
1442 s32 tpt = lq_sta->last_tpt / 100;
1443 if (tpt >= search_tbl->expected_tpt[index])
1444 break;
1445 }
1446 search_tbl->current_rate = rate_n_flags_from_tbl(
1447 search_tbl, index, is_green);
1448 lq_sta->search_better_tbl = 1;
b481de9c
ZY		 1449 goto out;
1450 }
1451 tbl->action++;
1452 if (tbl->action > IWL_SISO_SWITCH_GI)
1453 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1454
1455 if (tbl->action == start_action)
1456 break;
1457 }
1458 return 0;
1459
1460 out:
1461 tbl->action++;
1462 if (tbl->action > IWL_SISO_SWITCH_GI)
1463 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1464 return 0;
1465}
1466
77626355
BC		 1467/*
1468 * Try to switch to new modulation mode from MIMO
1469 */
c79dd5b5 1470static int rs_move_mimo_to_other(struct iwl_priv *priv,
c33104f0 1471 struct iwl4965_lq_sta *lq_sta,
270243a5
RR		 1472 struct ieee80211_conf *conf,
1473 struct sta_info *sta,
b481de9c
ZY		 1474 int index)
1475{
dc2453ae 1476 int ret;
c33104f0 1477 s8 is_green = lq_sta->is_green;
bb8c093b 1478 struct iwl4965_scale_tbl_info *tbl =
c33104f0 1479 &(lq_sta->lq_info[lq_sta->active_tbl]);
bb8c093b 1480 struct iwl4965_scale_tbl_info *search_tbl =
c33104f0 1481 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
bb8c093b
CH		 1482 u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1483 (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
b481de9c
ZY		 1484 u8 start_action = tbl->action;
1485
1486 for (;;) {
c33104f0 1487 lq_sta->action_counter++;
b481de9c
ZY		 1488 switch (tbl->action) {
1489 case IWL_MIMO_SWITCH_ANTENNA_A:
1490 case IWL_MIMO_SWITCH_ANTENNA_B:
eecd6e57 1491 IWL_DEBUG_RATE("LQ: MIMO2 switch to SISO\n");
0c11b4de 1492
77626355 1493 /* Set up new search table for SISO */
b481de9c 1494 memcpy(search_tbl, tbl, sz);
39e88504
GC		 1495
1496 /*FIXME:RS:need to check ant validity + C*/
b481de9c 1497 if (tbl->action == IWL_MIMO_SWITCH_ANTENNA_A)
fde0db31 1498 search_tbl->ant_type = ANT_A;
b481de9c 1499 else
fde0db31 1500 search_tbl->ant_type = ANT_B;
b481de9c 1501
c33104f0 1502 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
270243a5 1503 search_tbl, index);
dc2453ae 1504 if (!ret) {
c33104f0 1505 lq_sta->search_better_tbl = 1;
b481de9c
ZY		 1506 goto out;
1507 }
1508 break;
1509
1510 case IWL_MIMO_SWITCH_GI:
eecd6e57 1511 IWL_DEBUG_RATE("LQ: MIMO toggle SGI/NGI\n");
77626355
BC		 1512
1513 /* Set up new search table for MIMO */
b481de9c 1514 memcpy(search_tbl, tbl, sz);
39e88504 1515 search_tbl->is_SGI = !tbl->is_SGI;
eecd6e57 1516 rs_set_expected_tpt_table(lq_sta, search_tbl);
77626355
BC		 1517 /*
1518 * If active table already uses the fastest possible
1519 * modulation (dual stream with short guard interval),
1520 * and it's working well, there's no need to look
1521 * for a better type of modulation!
1522 */
39e88504 1523 if (tbl->is_SGI) {
c33104f0 1524 s32 tpt = lq_sta->last_tpt / 100;
39e88504
GC		 1525 if (tpt >= search_tbl->expected_tpt[index])
1526 break;
b481de9c 1527 }
39e88504
GC		 1528 search_tbl->current_rate = rate_n_flags_from_tbl(
1529 search_tbl, index, is_green);
1530 lq_sta->search_better_tbl = 1;
b481de9c
ZY		 1531 goto out;
1532
1533 }
1534 tbl->action++;
1535 if (tbl->action > IWL_MIMO_SWITCH_GI)
1536 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1537
1538 if (tbl->action == start_action)
1539 break;
1540 }
1541
1542 return 0;
1543 out:
1544 tbl->action++;
1545 if (tbl->action > IWL_MIMO_SWITCH_GI)
1546 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1547 return 0;
1548
1549}
1550
77626355
BC		 1551/*
1552 * Check whether we should continue using same modulation mode, or
1553 * begin search for a new mode, based on:
1554 * 1) # tx successes or failures while using this mode
1555 * 2) # times calling this function
1556 * 3) elapsed time in this mode (not used, for now)
1557 */
c33104f0 1558static void rs_stay_in_table(struct iwl4965_lq_sta *lq_sta)
b481de9c 1559{
bb8c093b 1560 struct iwl4965_scale_tbl_info *tbl;
b481de9c
ZY		 1561 int i;
1562 int active_tbl;
1563 int flush_interval_passed = 0;
1564
c33104f0 1565 active_tbl = lq_sta->active_tbl;
b481de9c 1566
c33104f0 1567 tbl = &(lq_sta->lq_info[active_tbl]);
b481de9c 1568
77626355 1569 /* If we've been disallowing search, see if we should now allow it */
c33104f0 1570 if (lq_sta->stay_in_tbl) {
b481de9c 1571
77626355 1572 /* Elapsed time using current modulation mode */
c33104f0 1573 if (lq_sta->flush_timer)
b481de9c
ZY		 1574 flush_interval_passed =
1575 time_after(jiffies,
c33104f0 1576 (unsigned long)(lq_sta->flush_timer +
b481de9c
ZY		 1577 IWL_RATE_SCALE_FLUSH_INTVL));
1578
77626355 1579 /* For now, disable the elapsed time criterion */
b481de9c 1580 flush_interval_passed = 0;
77626355
BC		 1581
1582 /*
1583 * Check if we should allow search for new modulation mode.
1584 * If many frames have failed or succeeded, or we've used
1585 * this same modulation for a long time, allow search, and
1586 * reset history stats that keep track of whether we should
1587 * allow a new search. Also (below) reset all bitmaps and
1588 * stats in active history.
1589 */
c33104f0
TW		 1590 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1591 (lq_sta->total_success > lq_sta->max_success_limit) ||
1592 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
b481de9c 1593 && (flush_interval_passed))) {
eecd6e57 1594 IWL_DEBUG_RATE("LQ: stay is expired %d %d %d\n:",
c33104f0
TW		 1595 lq_sta->total_failed,
1596 lq_sta->total_success,
b481de9c 1597 flush_interval_passed);
77626355
BC		 1598
1599 /* Allow search for new mode */
c33104f0
TW		 1600 lq_sta->stay_in_tbl = 0; /* only place reset */
1601 lq_sta->total_failed = 0;
1602 lq_sta->total_success = 0;
1603 lq_sta->flush_timer = 0;
77626355
BC		 1604
1605 /*
1606 * Else if we've used this modulation mode enough repetitions
1607 * (regardless of elapsed time or success/failure), reset
1608 * history bitmaps and rate-specific stats for all rates in
1609 * active table.
1610 */
403ab56b 1611 } else {
c33104f0
TW		 1612 lq_sta->table_count++;
1613 if (lq_sta->table_count >=
1614 lq_sta->table_count_limit) {
1615 lq_sta->table_count = 0;
b481de9c 1616
eecd6e57 1617 IWL_DEBUG_RATE("LQ: stay in table clear win\n");
b481de9c
ZY		 1618 for (i = 0; i < IWL_RATE_COUNT; i++)
1619 rs_rate_scale_clear_window(
1620 &(tbl->win[i]));
1621 }
1622 }
1623
77626355
BC		 1624 /* If transitioning to allow "search", reset all history
1625 * bitmaps and stats in active table (this will become the new
1626 * "search" table). */
c33104f0 1627 if (!lq_sta->stay_in_tbl) {
b481de9c
ZY		 1628 for (i = 0; i < IWL_RATE_COUNT; i++)
1629 rs_rate_scale_clear_window(&(tbl->win[i]));
1630 }
1631 }
1632}
1633
77626355
BC		 1634/*
1635 * Do rate scaling and search for new modulation mode.
1636 */
c79dd5b5 1637static void rs_rate_scale_perform(struct iwl_priv *priv,
b481de9c
ZY		 1638 struct net_device *dev,
1639 struct ieee80211_hdr *hdr,
1640 struct sta_info *sta)
1641{
270243a5
RR		 1642 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1643 struct ieee80211_hw *hw = local_to_hw(local);
1644 struct ieee80211_conf *conf = &hw->conf;
b481de9c
ZY		 1645 int low = IWL_RATE_INVALID;
1646 int high = IWL_RATE_INVALID;
1647 int index;
1648 int i;
bb8c093b 1649 struct iwl4965_rate_scale_data *window = NULL;
b481de9c
ZY		 1650 int current_tpt = IWL_INVALID_VALUE;
1651 int low_tpt = IWL_INVALID_VALUE;
1652 int high_tpt = IWL_INVALID_VALUE;
1653 u32 fail_count;
1654 s8 scale_action = 0;
1655 u16 fc, rate_mask;
1656 u8 update_lq = 0;
c33104f0 1657 struct iwl4965_lq_sta *lq_sta;
bb8c093b 1658 struct iwl4965_scale_tbl_info *tbl, *tbl1;
b481de9c 1659 u16 rate_scale_index_msk = 0;
39e88504 1660 u32 rate;
b481de9c
ZY		 1661 u8 is_green = 0;
1662 u8 active_tbl = 0;
1663 u8 done_search = 0;
1664 u16 high_low;
0c11b4de
RR		 1665#ifdef CONFIG_IWL4965_HT
1666 u8 tid = MAX_TID_COUNT;
1667 __le16 *qc;
1668#endif
b481de9c
ZY		 1669
1670 IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1671
1672 fc = le16_to_cpu(hdr->frame_control);
1673 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
1674 /* Send management frames and broadcast/multicast data using
1675 * lowest rate. */
1676 /* TODO: this could probably be improved.. */
1677 return;
1678 }
1679
1680 if (!sta || !sta->rate_ctrl_priv)
1681 return;
1682
1683 if (!priv->lq_mngr.lq_ready) {
1684 IWL_DEBUG_RATE("still rate scaling not ready\n");
1685 return;
1686 }
c33104f0 1687 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
b481de9c 1688
0c11b4de
RR		 1689#ifdef CONFIG_IWL4965_HT
1690 qc = ieee80211_get_qos_ctrl(hdr);
1691 if (qc) {
1692 tid = (u8)(le16_to_cpu(*qc) & 0xf);
1693 rs_tl_add_packet(lq_sta, tid);
1694 }
1695#endif
77626355
BC		 1696 /*
1697 * Select rate-scale / modulation-mode table to work with in
1698 * the rest of this function: "search" if searching for better
1699 * modulation mode, or "active" if doing rate scaling within a mode.
1700 */
c33104f0
TW		 1701 if (!lq_sta->search_better_tbl)
1702 active_tbl = lq_sta->active_tbl;
b481de9c 1703 else
c33104f0 1704 active_tbl = 1 - lq_sta->active_tbl;
b481de9c 1705
c33104f0
TW		 1706 tbl = &(lq_sta->lq_info[active_tbl]);
1707 is_green = lq_sta->is_green;
b481de9c 1708
77626355 1709 /* current tx rate */
8318d78a 1710 index = sta->last_txrate_idx;
b481de9c
ZY		 1711
1712 IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1713 tbl->lq_type);
1714
77626355 1715 /* rates available for this association, and for modulation mode */
eecd6e57 1716 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
b481de9c
ZY		 1717
1718 IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1719
1720 /* mask with station rate restriction */
1721 if (is_legacy(tbl->lq_type)) {
8318d78a 1722 if (lq_sta->band == IEEE80211_BAND_5GHZ)
77626355 1723 /* supp_rates has no CCK bits in A mode */
b481de9c 1724 rate_scale_index_msk = (u16) (rate_mask &
c33104f0 1725 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
b481de9c
ZY		 1726 else
1727 rate_scale_index_msk = (u16) (rate_mask &
c33104f0 1728 lq_sta->supp_rates);
b481de9c
ZY		 1729
1730 } else
1731 rate_scale_index_msk = rate_mask;
1732
1733 if (!rate_scale_index_msk)
1734 rate_scale_index_msk = rate_mask;
1735
77626355
BC		 1736 /* If current rate is no longer supported on current association,
1737 * or user changed preferences for rates, find a new supported rate. */
b481de9c
ZY		 1738 if (index < 0 || !((1 << index) & rate_scale_index_msk)) {
1739 index = IWL_INVALID_VALUE;
1740 update_lq = 1;
1741
77626355 1742 /* get the highest available rate */
b481de9c
ZY		 1743 for (i = 0; i <= IWL_RATE_COUNT; i++) {
1744 if ((1 << i) & rate_scale_index_msk)
1745 index = i;
1746 }
1747
1748 if (index == IWL_INVALID_VALUE) {
1749 IWL_WARNING("Can not find a suitable rate\n");
1750 return;
1751 }
1752 }
1753
77626355 1754 /* Get expected throughput table and history window for current rate */
b481de9c 1755 if (!tbl->expected_tpt)
eecd6e57 1756 rs_set_expected_tpt_table(lq_sta, tbl);
b481de9c
ZY		 1757
1758 window = &(tbl->win[index]);
1759
77626355
BC		 1760 /*
1761 * If there is not enough history to calculate actual average
1762 * throughput, keep analyzing results of more tx frames, without
1763 * changing rate or mode (bypass most of the rest of this function).
1764 * Set up new rate table in uCode only if old rate is not supported
1765 * in current association (use new rate found above).
1766 */
b481de9c
ZY		 1767 fail_count = window->counter - window->success_counter;
1768 if (((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1769 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH))
1770 || (tbl->expected_tpt == NULL)) {
1771 IWL_DEBUG_RATE("LQ: still below TH succ %d total %d "
1772 "for index %d\n",
1773 window->success_counter, window->counter, index);
77626355
BC		 1774
1775 /* Can't calculate this yet; not enough history */
b481de9c 1776 window->average_tpt = IWL_INVALID_VALUE;
77626355
BC		 1777
1778 /* Should we stay with this modulation mode,
1779 * or search for a new one? */
c33104f0 1780 rs_stay_in_table(lq_sta);
77626355
BC		 1781
1782 /* Set up new rate table in uCode, if needed */
b481de9c 1783 if (update_lq) {
39e88504
GC		 1784 rate = rate_n_flags_from_tbl(tbl, index, is_green);
1785 rs_fill_link_cmd(priv, lq_sta, rate, &lq_sta->lq);
66c73db7 1786 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
b481de9c
ZY		 1787 }
1788 goto out;
1789
77626355
BC		 1790 /* Else we have enough samples; calculate estimate of
1791 * actual average throughput */
b481de9c
ZY		 1792 } else
1793 window->average_tpt = ((window->success_ratio *
1794 tbl->expected_tpt[index] + 64) / 128);
1795
77626355 1796 /* If we are searching for better modulation mode, check success. */
c33104f0 1797 if (lq_sta->search_better_tbl) {
b481de9c
ZY		 1798 int success_limit = IWL_RATE_SCALE_SWITCH;
1799
77626355
BC		 1800 /* If good success, continue using the "search" mode;
1801 * no need to send new link quality command, since we're
1802 * continuing to use the setup that we've been trying. */
b481de9c 1803 if ((window->success_ratio > success_limit) ||
c33104f0 1804 (window->average_tpt > lq_sta->last_tpt)) {
b481de9c 1805 if (!is_legacy(tbl->lq_type)) {
eecd6e57 1806 IWL_DEBUG_RATE("LQ: we are switching to HT"
b481de9c
ZY		 1807 " rate suc %d current tpt %d"
1808 " old tpt %d\n",
1809 window->success_ratio,
1810 window->average_tpt,
c33104f0
TW		 1811 lq_sta->last_tpt);
1812 lq_sta->enable_counter = 1;
b481de9c 1813 }
77626355 1814 /* Swap tables; "search" becomes "active" */
c33104f0 1815 lq_sta->active_tbl = active_tbl;
b481de9c 1816 current_tpt = window->average_tpt;
77626355
BC		 1817
1818 /* Else poor success; go back to mode in "active" table */
b481de9c 1819 } else {
77626355 1820 /* Nullify "search" table */
b481de9c 1821 tbl->lq_type = LQ_NONE;
77626355
BC		 1822
1823 /* Revert to "active" table */
c33104f0
TW		 1824 active_tbl = lq_sta->active_tbl;
1825 tbl = &(lq_sta->lq_info[active_tbl]);
b481de9c 1826
77626355 1827 /* Revert to "active" rate and throughput info */
17744ff6 1828 index = iwl4965_hwrate_to_plcp_idx(
39e88504 1829 tbl->current_rate);
c33104f0 1830 current_tpt = lq_sta->last_tpt;
b481de9c 1831
77626355 1832 /* Need to set up a new rate table in uCode */
b481de9c 1833 update_lq = 1;
eecd6e57 1834 IWL_DEBUG_RATE("XXY GO BACK TO OLD TABLE\n");
b481de9c 1835 }
77626355
BC		 1836
1837 /* Either way, we've made a decision; modulation mode
1838 * search is done, allow rate adjustment next time. */
c33104f0 1839 lq_sta->search_better_tbl = 0;
77626355 1840 done_search = 1; /* Don't switch modes below! */
b481de9c
ZY		 1841 goto lq_update;
1842 }
1843
77626355
BC		 1844 /* (Else) not in search of better modulation mode, try for better
1845 * starting rate, while staying in this mode. */
b481de9c
ZY		 1846 high_low = rs_get_adjacent_rate(index, rate_scale_index_msk,
1847 tbl->lq_type);
1848 low = high_low & 0xff;
1849 high = (high_low >> 8) & 0xff;
1850
77626355 1851 /* Collect measured throughputs for current and adjacent rates */
b481de9c 1852 current_tpt = window->average_tpt;
b481de9c
ZY		 1853 if (low != IWL_RATE_INVALID)
1854 low_tpt = tbl->win[low].average_tpt;
b481de9c
ZY		 1855 if (high != IWL_RATE_INVALID)
1856 high_tpt = tbl->win[high].average_tpt;
1857
77626355 1858 /* Assume rate increase */
b481de9c
ZY		 1859 scale_action = 1;
1860
77626355 1861 /* Too many failures, decrease rate */
b481de9c
ZY		 1862 if ((window->success_ratio <= IWL_RATE_DECREASE_TH) ||
1863 (current_tpt == 0)) {
1864 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1865 scale_action = -1;
77626355
BC		 1866
1867 /* No throughput measured yet for adjacent rates; try increase. */
b481de9c
ZY		 1868 } else if ((low_tpt == IWL_INVALID_VALUE) &&
1869 (high_tpt == IWL_INVALID_VALUE))
1870 scale_action = 1;
77626355
BC		 1871
1872 /* Both adjacent throughputs are measured, but neither one has better
1873 * throughput; we're using the best rate, don't change it! */
b481de9c
ZY		 1874 else if ((low_tpt != IWL_INVALID_VALUE) &&
1875 (high_tpt != IWL_INVALID_VALUE) &&
1876 (low_tpt < current_tpt) &&
1877 (high_tpt < current_tpt))
1878 scale_action = 0;
77626355
BC		 1879
1880 /* At least one adjacent rate's throughput is measured,
1881 * and may have better performance. */
b481de9c 1882 else {
77626355 1883 /* Higher adjacent rate's throughput is measured */
b481de9c 1884 if (high_tpt != IWL_INVALID_VALUE) {
77626355 1885 /* Higher rate has better throughput */
b481de9c
ZY		 1886 if (high_tpt > current_tpt)
1887 scale_action = 1;
1888 else {
1889 IWL_DEBUG_RATE
1890 ("decrease rate because of high tpt\n");
1891 scale_action = -1;
1892 }
77626355
BC		 1893
1894 /* Lower adjacent rate's throughput is measured */
b481de9c 1895 } else if (low_tpt != IWL_INVALID_VALUE) {
77626355 1896 /* Lower rate has better throughput */
b481de9c
ZY		 1897 if (low_tpt > current_tpt) {
1898 IWL_DEBUG_RATE
1899 ("decrease rate because of low tpt\n");
1900 scale_action = -1;
1901 } else
1902 scale_action = 1;
1903 }
1904 }
1905
77626355
BC		 1906 /* Sanity check; asked for decrease, but success rate or throughput
1907 * has been good at old rate. Don't change it. */
b481de9c
ZY		 1908 if (scale_action == -1) {
1909 if ((low != IWL_RATE_INVALID) &&
1910 ((window->success_ratio > IWL_RATE_HIGH_TH) ||
1911 (current_tpt > (100 * tbl->expected_tpt[low]))))
1912 scale_action = 0;
77626355
BC		 1913
1914 /* Sanity check; asked for increase, but success rate has not been great
1915 * even at old rate, higher rate will be worse. Don't change it. */
b481de9c
ZY		 1916 } else if ((scale_action == 1) &&
1917 (window->success_ratio < IWL_RATE_INCREASE_TH))
1918 scale_action = 0;
1919
1920 switch (scale_action) {
1921 case -1:
77626355 1922 /* Decrease starting rate, update uCode's rate table */
b481de9c
ZY		 1923 if (low != IWL_RATE_INVALID) {
1924 update_lq = 1;
1925 index = low;
1926 }
1927 break;
1928 case 1:
77626355 1929 /* Increase starting rate, update uCode's rate table */
b481de9c
ZY		 1930 if (high != IWL_RATE_INVALID) {
1931 update_lq = 1;
1932 index = high;
1933 }
1934
1935 break;
1936 case 0:
77626355 1937 /* No change */
b481de9c
ZY		 1938 default:
1939 break;
1940 }
1941
eecd6e57 1942 IWL_DEBUG_RATE("choose rate scale index %d action %d low %d "
b481de9c
ZY		 1943 "high %d type %d\n",
1944 index, scale_action, low, high, tbl->lq_type);
1945
1946 lq_update:
77626355 1947 /* Replace uCode's rate table for the destination station. */
b481de9c 1948 if (update_lq) {
39e88504
GC		 1949 rate = rate_n_flags_from_tbl(tbl, index, is_green);
1950 rs_fill_link_cmd(priv, lq_sta, rate, &lq_sta->lq);
66c73db7 1951 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
b481de9c 1952 }
77626355
BC		 1953
1954 /* Should we stay with this modulation mode, or search for a new one? */
c33104f0 1955 rs_stay_in_table(lq_sta);
b481de9c 1956
77626355
BC		 1957 /*
1958 * Search for new modulation mode if we're:
1959 * 1) Not changing rates right now
1960 * 2) Not just finishing up a search
1961 * 3) Allowing a new search
1962 */
c33104f0 1963 if (!update_lq && !done_search && !lq_sta->stay_in_tbl) {
77626355 1964 /* Save current throughput to compare with "search" throughput*/
c33104f0 1965 lq_sta->last_tpt = current_tpt;
b481de9c 1966
77626355
BC		 1967 /* Select a new "search" modulation mode to try.
1968 * If one is found, set up the new "search" table. */
b481de9c 1969 if (is_legacy(tbl->lq_type))
c33104f0 1970 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
b481de9c 1971 else if (is_siso(tbl->lq_type))
c33104f0 1972 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
b481de9c 1973 else
c33104f0 1974 rs_move_mimo_to_other(priv, lq_sta, conf, sta, index);
b481de9c 1975
77626355 1976 /* If new "search" mode was selected, set up in uCode table */
c33104f0 1977 if (lq_sta->search_better_tbl) {
77626355 1978 /* Access the "search" table, clear its history. */
c33104f0 1979 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
b481de9c
ZY		 1980 for (i = 0; i < IWL_RATE_COUNT; i++)
1981 rs_rate_scale_clear_window(&(tbl->win[i]));
1982
77626355 1983 /* Use new "search" start rate */
17744ff6 1984 index = iwl4965_hwrate_to_plcp_idx(
39e88504 1985 tbl->current_rate);
b481de9c 1986
eecd6e57 1987 IWL_DEBUG_RATE("Switch current mcs: %X index: %d\n",
39e88504
GC		 1988 tbl->current_rate, index);
1989 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate,
c33104f0 1990 &lq_sta->lq);
66c73db7 1991 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
b481de9c 1992 }
b481de9c 1993
77626355
BC		 1994 /* If the "active" (non-search) mode was legacy,
1995 * and we've tried switching antennas,
1996 * but we haven't been able to try HT modes (not available),
1997 * stay with best antenna legacy modulation for a while
1998 * before next round of mode comparisons. */
c33104f0 1999 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
b481de9c 2000 if (is_legacy(tbl1->lq_type) &&
c8b0e6e1 2001#ifdef CONFIG_IWL4965_HT
270243a5 2002 (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)) &&
b481de9c 2003#endif
c33104f0
TW		 2004 (lq_sta->action_counter >= 1)) {
2005 lq_sta->action_counter = 0;
eecd6e57 2006 IWL_DEBUG_RATE("LQ: STAY in legacy table\n");
c33104f0 2007 rs_set_stay_in_table(1, lq_sta);
b481de9c
ZY		 2008 }
2009
77626355
BC		 2010 /* If we're in an HT mode, and all 3 mode switch actions
2011 * have been tried and compared, stay in this best modulation
2012 * mode for a while before next round of mode comparisons. */
c33104f0
TW		 2013 if (lq_sta->enable_counter &&
2014 (lq_sta->action_counter >= IWL_ACTION_LIMIT)) {
0c11b4de
RR		 2015#ifdef CONFIG_IWL4965_HT
2016 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2017 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2018 (tid != MAX_TID_COUNT)) {
eecd6e57 2019 IWL_DEBUG_RATE("try to aggregate tid %d\n", tid);
0c11b4de 2020 rs_tl_turn_on_agg(priv, tid, lq_sta, sta);
b481de9c 2021 }
0c11b4de 2022#endif /*CONFIG_IWL4965_HT */
c33104f0
TW		 2023 lq_sta->action_counter = 0;
2024 rs_set_stay_in_table(0, lq_sta);
b481de9c 2025 }
77626355
BC		 2026
2027 /*
2028 * Else, don't search for a new modulation mode.
2029 * Put new timestamp in stay-in-modulation-mode flush timer if:
2030 * 1) Not changing rates right now
2031 * 2) Not just finishing up a search
2032 * 3) flush timer is empty
2033 */
b481de9c 2034 } else {
c33104f0
TW		 2035 if ((!update_lq) && (!done_search) && (!lq_sta->flush_timer))
2036 lq_sta->flush_timer = jiffies;
b481de9c
ZY		 2037 }
2038
2039out:
39e88504 2040 tbl->current_rate = rate_n_flags_from_tbl(tbl, index, is_green);
b481de9c 2041 i = index;
8318d78a 2042 sta->last_txrate_idx = i;
b481de9c 2043
8318d78a 2044 /* sta->txrate_idx is an index to A mode rates which start
b481de9c
ZY		 2045 * at IWL_FIRST_OFDM_RATE
2046 */
8318d78a
JB		 2047 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2048 sta->txrate_idx = i - IWL_FIRST_OFDM_RATE;
b481de9c 2049 else
8318d78a 2050 sta->txrate_idx = i;
b481de9c
ZY		 2051
2052 return;
2053}
2054
2055
c79dd5b5 2056static void rs_initialize_lq(struct iwl_priv *priv,
270243a5 2057 struct ieee80211_conf *conf,
b481de9c
ZY		 2058 struct sta_info *sta)
2059{
2060 int i;
c33104f0 2061 struct iwl4965_lq_sta *lq_sta;
bb8c093b 2062 struct iwl4965_scale_tbl_info *tbl;
b481de9c
ZY		 2063 u8 active_tbl = 0;
2064 int rate_idx;
270243a5 2065 u8 use_green = rs_use_green(priv, conf);
39e88504 2066 u32 rate;
b481de9c
ZY		 2067
2068 if (!sta || !sta->rate_ctrl_priv)
2069 goto out;
2070
c33104f0 2071 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
8318d78a 2072 i = sta->last_txrate_idx;
b481de9c 2073
c33104f0 2074 if ((lq_sta->lq.sta_id == 0xff) &&
b481de9c
ZY		 2075 (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
2076 goto out;
2077
c33104f0
TW		 2078 if (!lq_sta->search_better_tbl)
2079 active_tbl = lq_sta->active_tbl;
b481de9c 2080 else
c33104f0 2081 active_tbl = 1 - lq_sta->active_tbl;
b481de9c 2082
c33104f0 2083 tbl = &(lq_sta->lq_info[active_tbl]);
b481de9c
ZY		 2084
2085 if ((i < 0) || (i >= IWL_RATE_COUNT))
2086 i = 0;
2087
fde0db31 2088 /* FIXME:RS: This is also wrong in 4965 */
39e88504
GC		 2089 rate = iwl4965_rates[i].plcp;
2090 rate |= RATE_MCS_ANT_B_MSK;
2091 rate &= ~RATE_MCS_ANT_A_MSK;
b481de9c
ZY		 2092
2093 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
39e88504 2094 rate |= RATE_MCS_CCK_MSK;
b481de9c 2095
fde0db31 2096 tbl->ant_type = ANT_B;
39e88504 2097 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
fde0db31 2098 if (!rs_is_ant_connected(priv->hw_params.valid_tx_ant, tbl->ant_type))
39e88504 2099 rs_toggle_antenna(&rate, tbl);
b481de9c 2100
39e88504
GC		 2101 rate = rate_n_flags_from_tbl(tbl, rate_idx, use_green);
2102 tbl->current_rate = rate;
eecd6e57 2103 rs_set_expected_tpt_table(lq_sta, tbl);
39e88504 2104 rs_fill_link_cmd(NULL, lq_sta, rate, &lq_sta->lq);
66c73db7 2105 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
b481de9c
ZY		 2106 out:
2107 return;
2108}
2109
1abbe498 2110static void rs_get_rate(void *priv_rate, struct net_device *dev,
8318d78a
JB		 2111 struct ieee80211_supported_band *sband,
2112 struct sk_buff *skb,
1abbe498 2113 struct rate_selection *sel)
b481de9c
ZY		 2114{
2115
2116 int i;
2117 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
270243a5 2118 struct ieee80211_conf *conf = &local->hw.conf;
b481de9c
ZY		 2119 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2120 struct sta_info *sta;
2bc454b0 2121 u16 fc;
c79dd5b5 2122 struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
c33104f0 2123 struct iwl4965_lq_sta *lq_sta;
b481de9c 2124
58826351 2125 IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
b481de9c 2126
d0709a65
JB		 2127 rcu_read_lock();
2128
b481de9c
ZY		 2129 sta = sta_info_get(local, hdr->addr1);
2130
2bc454b0
MW		 2131 /* Send management frames and broadcast/multicast data using lowest
2132 * rate. */
2133 fc = le16_to_cpu(hdr->frame_control);
2134 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1) ||
2135 !sta || !sta->rate_ctrl_priv) {
8318d78a 2136 sel->rate = rate_lowest(local, sband, sta);
f4d6082d 2137 goto out;
b481de9c
ZY		 2138 }
2139
c33104f0 2140 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
8318d78a 2141 i = sta->last_txrate_idx;
b481de9c 2142
c33104f0
TW		 2143 if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
2144 !lq_sta->ibss_sta_added) {
947b13a7 2145 u8 sta_id = iwl_find_station(priv, hdr->addr1);
0795af57 2146 DECLARE_MAC_BUF(mac);
b481de9c
ZY		 2147
2148 if (sta_id == IWL_INVALID_STATION) {
0795af57
JP		 2149 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2150 print_mac(mac, hdr->addr1));
67d62035
RR		 2151 sta_id = iwl4965_add_station_flags(priv, hdr->addr1,
2152 0, CMD_ASYNC, NULL);
b481de9c
ZY		 2153 }
2154 if ((sta_id != IWL_INVALID_STATION)) {
c33104f0
TW		 2155 lq_sta->lq.sta_id = sta_id;
2156 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2157 lq_sta->ibss_sta_added = 1;
270243a5 2158 rs_initialize_lq(priv, conf, sta);
b481de9c 2159 }
c33104f0 2160 if (!lq_sta->ibss_sta_added)
b481de9c
ZY		 2161 goto done;
2162 }
2163
f4d6082d 2164done:
1abbe498 2165 if ((i < 0) || (i > IWL_RATE_COUNT)) {
8318d78a 2166 sel->rate = rate_lowest(local, sband, sta);
f4d6082d 2167 goto out;
1abbe498 2168 }
b481de9c 2169
1abbe498 2170 sel->rate = &priv->ieee_rates[i];
f4d6082d
TW		 2171out:
2172 rcu_read_unlock();
b481de9c
ZY		 2173}
2174
2175static void *rs_alloc_sta(void *priv, gfp_t gfp)
2176{
c33104f0 2177 struct iwl4965_lq_sta *lq_sta;
b481de9c
ZY		 2178 int i, j;
2179
2180 IWL_DEBUG_RATE("create station rate scale window\n");
2181
c33104f0 2182 lq_sta = kzalloc(sizeof(struct iwl4965_lq_sta), gfp);
b481de9c 2183
c33104f0 2184 if (lq_sta == NULL)
b481de9c 2185 return NULL;
c33104f0 2186 lq_sta->lq.sta_id = 0xff;
b481de9c 2187
63fddb9f 2188
b481de9c
ZY		 2189 for (j = 0; j < LQ_SIZE; j++)
2190 for (i = 0; i < IWL_RATE_COUNT; i++)
c33104f0 2191 rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
b481de9c 2192
c33104f0 2193 return lq_sta;
b481de9c
ZY		 2194}
2195
2196static void rs_rate_init(void *priv_rate, void *priv_sta,
2197 struct ieee80211_local *local,
2198 struct sta_info *sta)
2199{
2200 int i, j;
270243a5 2201 struct ieee80211_conf *conf = &local->hw.conf;
8318d78a 2202 struct ieee80211_supported_band *sband;
c79dd5b5 2203 struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
c33104f0 2204 struct iwl4965_lq_sta *lq_sta = priv_sta;
b481de9c 2205
8318d78a
JB		 2206 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2207
c33104f0 2208 lq_sta->flush_timer = 0;
8318d78a
JB		 2209 lq_sta->supp_rates = sta->supp_rates[sband->band];
2210 sta->txrate_idx = 3;
b481de9c
ZY		 2211 for (j = 0; j < LQ_SIZE; j++)
2212 for (i = 0; i < IWL_RATE_COUNT; i++)
c33104f0 2213 rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
b481de9c
ZY		 2214
2215 IWL_DEBUG_RATE("rate scale global init\n");
2216 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2217 * the lowest or the highest rate.. Could consider using RSSI from
2218 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2219 * after assoc.. */
2220
c33104f0 2221 lq_sta->ibss_sta_added = 0;
b481de9c 2222 if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
947b13a7 2223 u8 sta_id = iwl_find_station(priv, sta->addr);
0795af57
JP		 2224 DECLARE_MAC_BUF(mac);
2225
b481de9c 2226 /* for IBSS the call are from tasklet */
eecd6e57 2227 IWL_DEBUG_RATE("LQ: ADD station %s\n",
0795af57 2228 print_mac(mac, sta->addr));
b481de9c
ZY		 2229
2230 if (sta_id == IWL_INVALID_STATION) {
0795af57
JP		 2231 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2232 print_mac(mac, sta->addr));
67d62035
RR		 2233 sta_id = iwl4965_add_station_flags(priv, sta->addr,
2234 0, CMD_ASYNC, NULL);
b481de9c
ZY		 2235 }
2236 if ((sta_id != IWL_INVALID_STATION)) {
c33104f0
TW		 2237 lq_sta->lq.sta_id = sta_id;
2238 lq_sta->lq.rs_table[0].rate_n_flags = 0;
b481de9c
ZY		 2239 }
2240 /* FIXME: this is w/a remove it later */
2241 priv->assoc_station_added = 1;
2242 }
2243
77626355 2244 /* Find highest tx rate supported by hardware and destination station */
8318d78a
JB		 2245 for (i = 0; i < sband->n_bitrates; i++)
2246 if (sta->supp_rates[sband->band] & BIT(i))
2247 sta->txrate_idx = i;
2248
2249 sta->last_txrate_idx = sta->txrate_idx;
2250 /* WTF is with this bogus comment? A doesn't have cck rates */
77626355 2251 /* For MODE_IEEE80211A, cck rates are at end of rate table */
8318d78a
JB		 2252 if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
2253 sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
b481de9c 2254
c33104f0 2255 lq_sta->is_dup = 0;
c33104f0 2256 lq_sta->is_green = rs_use_green(priv, conf);
39e88504 2257 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
c33104f0 2258 lq_sta->active_rate_basic = priv->active_rate_basic;
8318d78a 2259 lq_sta->band = priv->band;
c8b0e6e1 2260#ifdef CONFIG_IWL4965_HT
77626355
BC		 2261 /*
2262 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2263 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2264 */
fde0db31
GC		 2265 lq_sta->active_siso_rate =
2266 priv->current_ht_config.supp_mcs_set[0] << 1;
c33104f0 2267 lq_sta->active_siso_rate |=
fde0db31 2268 priv->current_ht_config.supp_mcs_set[0] & 0x1;
c33104f0 2269 lq_sta->active_siso_rate &= ~((u16)0x2);
fde0db31 2270 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
b481de9c 2271
77626355 2272 /* Same here */
fde0db31
GC		 2273 lq_sta->active_mimo2_rate =
2274 priv->current_ht_config.supp_mcs_set[1] << 1;
2275 lq_sta->active_mimo2_rate |=
2276 priv->current_ht_config.supp_mcs_set[1] & 0x1;
2277 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2278 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2279
2280 lq_sta->active_mimo3_rate =
2281 priv->current_ht_config.supp_mcs_set[2] << 1;
2282 lq_sta->active_mimo3_rate |=
2283 priv->current_ht_config.supp_mcs_set[2] & 0x1;
2284 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2285 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2286
eecd6e57 2287 IWL_DEBUG_RATE("SISO RATE %X MIMO2 RATE %X MIMO3 RATE %X\n",
c33104f0 2288 lq_sta->active_siso_rate,
fde0db31
GC		 2289 lq_sta->active_mimo2_rate,
2290 lq_sta->active_mimo3_rate);
2291
0c11b4de
RR		 2292 /* as default allow aggregation for all tids */
2293 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
c8b0e6e1 2294#endif /*CONFIG_IWL4965_HT*/
98d7e09a 2295#ifdef CONFIG_MAC80211_DEBUGFS
c33104f0 2296 lq_sta->drv = priv;
98d7e09a 2297#endif
b481de9c
ZY		 2298
2299 if (priv->assoc_station_added)
2300 priv->lq_mngr.lq_ready = 1;
2301
270243a5 2302 rs_initialize_lq(priv, conf, sta);
b481de9c
ZY		 2303}
2304
fde0db31
GC		 2305static void rs_fill_link_cmd(const struct iwl_priv *priv,
2306 struct iwl4965_lq_sta *lq_sta,
39e88504 2307 u32 new_rate,
fde0db31 2308 struct iwl_link_quality_cmd *lq_cmd)
b481de9c
ZY		 2309{
2310 int index = 0;
b481de9c 2311 int rate_idx;
1b696de2 2312 int repeat_rate = 0;
b481de9c
ZY		 2313 u8 ant_toggle_count = 0;
2314 u8 use_ht_possible = 1;
bb8c093b 2315 struct iwl4965_scale_tbl_info tbl_type = { 0 };
b481de9c 2316
77626355 2317 /* Override starting rate (index 0) if needed for debug purposes */
39e88504 2318 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
98d7e09a 2319
39e88504
GC		 2320 /* Interpret new_rate (rate_n_flags) */
2321 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
b481de9c
ZY		 2322 &tbl_type, &rate_idx);
2323
77626355 2324 /* How many times should we repeat the initial rate? */
b481de9c
ZY		 2325 if (is_legacy(tbl_type.lq_type)) {
2326 ant_toggle_count = 1;
1b696de2 2327 repeat_rate = IWL_NUMBER_TRY;
b481de9c 2328 } else
1b696de2 2329 repeat_rate = IWL_HT_NUMBER_TRY;
b481de9c
ZY		 2330
2331 lq_cmd->general_params.mimo_delimiter =
2332 is_mimo(tbl_type.lq_type) ? 1 : 0;
77626355
BC		 2333
2334 /* Fill 1st table entry (index 0) */
39e88504 2335 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
b481de9c 2336
fde0db31
GC		 2337 /*FIXME:RS*/
2338 if (is_mimo(tbl_type.lq_type) || (tbl_type.ant_type == ANT_A))
77626355
BC		 2339 lq_cmd->general_params.single_stream_ant_msk
2340 = LINK_QUAL_ANT_A_MSK;
b481de9c 2341 else
77626355
BC		 2342 lq_cmd->general_params.single_stream_ant_msk
2343 = LINK_QUAL_ANT_B_MSK;
b481de9c
ZY		 2344
2345 index++;
1b696de2 2346 repeat_rate--;
b481de9c 2347
77626355 2348 /* Fill rest of rate table */
b481de9c 2349 while (index < LINK_QUAL_MAX_RETRY_NUM) {
77626355
BC		 2350 /* Repeat initial/next rate.
2351 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2352 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
1b696de2 2353 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
b481de9c
ZY		 2354 if (is_legacy(tbl_type.lq_type)) {
2355 if (ant_toggle_count <
2356 NUM_TRY_BEFORE_ANTENNA_TOGGLE)
2357 ant_toggle_count++;
fde0db31
GC		 2358 else if (priv && rs_is_other_ant_connected(
2359 priv->hw_params.valid_tx_ant,
2360 tbl_type.ant_type)) {
b481de9c
ZY		 2361 rs_toggle_antenna(&new_rate, &tbl_type);
2362 ant_toggle_count = 1;
2363 }
2364 }
98d7e09a 2365
77626355 2366 /* Override next rate if needed for debug purposes */
c33104f0 2367 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
77626355
BC		 2368
2369 /* Fill next table entry */
b481de9c 2370 lq_cmd->rs_table[index].rate_n_flags =
39e88504 2371 cpu_to_le32(new_rate);
1b696de2 2372 repeat_rate--;
b481de9c
ZY		 2373 index++;
2374 }
2375
39e88504 2376 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
b481de9c
ZY		 2377 &rate_idx);
2378
77626355
BC		 2379 /* Indicate to uCode which entries might be MIMO.
2380 * If initial rate was MIMO, this will finally end up
2381 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
b481de9c
ZY		 2382 if (is_mimo(tbl_type.lq_type))
2383 lq_cmd->general_params.mimo_delimiter = index;
2384
77626355 2385 /* Get next rate */
39e88504
GC		 2386 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2387 use_ht_possible);
b481de9c 2388
77626355 2389 /* How many times should we repeat the next rate? */
b481de9c
ZY		 2390 if (is_legacy(tbl_type.lq_type)) {
2391 if (ant_toggle_count < NUM_TRY_BEFORE_ANTENNA_TOGGLE)
2392 ant_toggle_count++;
fde0db31
GC		 2393 else if (priv && rs_is_other_ant_connected(
2394 priv->hw_params.valid_tx_ant,
2395 tbl_type.ant_type)) {
b481de9c
ZY		 2396 rs_toggle_antenna(&new_rate, &tbl_type);
2397 ant_toggle_count = 1;
2398 }
1b696de2 2399 repeat_rate = IWL_NUMBER_TRY;
b481de9c 2400 } else
1b696de2 2401 repeat_rate = IWL_HT_NUMBER_TRY;
b481de9c 2402
77626355
BC		 2403 /* Don't allow HT rates after next pass.
2404 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
b481de9c
ZY		 2405 use_ht_possible = 0;
2406
77626355 2407 /* Override next rate if needed for debug purposes */
c33104f0 2408 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
77626355
BC		 2409
2410 /* Fill next table entry */
39e88504 2411 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
b481de9c
ZY		 2412
2413 index++;
1b696de2 2414 repeat_rate--;
b481de9c
ZY		 2415 }
2416
b481de9c
ZY		 2417 lq_cmd->general_params.dual_stream_ant_msk = 3;
2418 lq_cmd->agg_params.agg_dis_start_th = 3;
2419 lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
b481de9c
ZY		 2420}
2421
2422static void *rs_alloc(struct ieee80211_local *local)
2423{
2424 return local->hw.priv;
2425}
2426/* rate scale requires free function to be implemented */
2427static void rs_free(void *priv_rate)
2428{
2429 return;
2430}
2431
2432static void rs_clear(void *priv_rate)
2433{
c79dd5b5 2434 struct iwl_priv *priv = (struct iwl_priv *) priv_rate;
b481de9c
ZY		 2435
2436 IWL_DEBUG_RATE("enter\n");
2437
2438 priv->lq_mngr.lq_ready = 0;
b481de9c
ZY		 2439
2440 IWL_DEBUG_RATE("leave\n");
2441}
2442
2443static void rs_free_sta(void *priv, void *priv_sta)
2444{
c33104f0 2445 struct iwl4965_lq_sta *lq_sta = priv_sta;
b481de9c
ZY		 2446
2447 IWL_DEBUG_RATE("enter\n");
c33104f0 2448 kfree(lq_sta);
b481de9c
ZY		 2449 IWL_DEBUG_RATE("leave\n");
2450}
2451
2452
93dc646a 2453#ifdef CONFIG_MAC80211_DEBUGFS
5ae212c9
ZY		 2454static int open_file_generic(struct inode *inode, struct file *file)
2455{
2456 file->private_data = inode->i_private;
2457 return 0;
2458}
c33104f0 2459static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
39e88504 2460 u32 *rate_n_flags, int index)
98d7e09a 2461{
39e88504
GC		 2462 if (lq_sta->dbg_fixed_rate) {
2463 if (index < 12) {
2464 *rate_n_flags = lq_sta->dbg_fixed_rate;
2465 } else {
2466 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2467 *rate_n_flags = 0x800D;
2468 else
2469 *rate_n_flags = 0x820A;
2470 }
98d7e09a 2471 IWL_DEBUG_RATE("Fixed rate ON\n");
39e88504
GC		 2472 } else {
2473 IWL_DEBUG_RATE("Fixed rate OFF\n");
98d7e09a 2474 }
98d7e09a 2475}
5ae212c9 2476
98d7e09a
ZY		 2477static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2478 const char __user *user_buf, size_t count, loff_t *ppos)
2479{
c33104f0 2480 struct iwl4965_lq_sta *lq_sta = file->private_data;
98d7e09a
ZY		 2481 char buf[64];
2482 int buf_size;
2483 u32 parsed_rate;
2484
2485 memset(buf, 0, sizeof(buf));
2486 buf_size = min(count, sizeof(buf) - 1);
2487 if (copy_from_user(buf, user_buf, buf_size))
2488 return -EFAULT;
2489
2490 if (sscanf(buf, "%x", &parsed_rate) == 1)
39e88504 2491 lq_sta->dbg_fixed_rate = parsed_rate;
98d7e09a 2492 else
39e88504 2493 lq_sta->dbg_fixed_rate = 0;
98d7e09a 2494
39e88504
GC		 2495 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2496 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2497 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2498 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
98d7e09a
ZY		 2499
2500 IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
39e88504 2501 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
98d7e09a 2502
39e88504
GC		 2503 if (lq_sta->dbg_fixed_rate) {
2504 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate,
2505 &lq_sta->lq);
66c73db7 2506 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
98d7e09a
ZY		 2507 }
2508
2509 return count;
2510}
0209dc11 2511
5ae212c9
ZY		 2512static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2513 char __user *user_buf, size_t count, loff_t *ppos)
2514{
2515 char buff[1024];
2516 int desc = 0;
2517 int i = 0;
2518
c33104f0 2519 struct iwl4965_lq_sta *lq_sta = file->private_data;
5ae212c9 2520
c33104f0 2521 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
98d7e09a 2522 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
c33104f0 2523 lq_sta->total_failed, lq_sta->total_success,
39e88504 2524 lq_sta->active_legacy_rate);
98d7e09a 2525 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
39e88504 2526 lq_sta->dbg_fixed_rate);
5ae212c9
ZY		 2527 desc += sprintf(buff+desc, "general:"
2528 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
c33104f0
TW		 2529 lq_sta->lq.general_params.flags,
2530 lq_sta->lq.general_params.mimo_delimiter,
2531 lq_sta->lq.general_params.single_stream_ant_msk,
2532 lq_sta->lq.general_params.dual_stream_ant_msk);
5ae212c9
ZY		 2533
2534 desc += sprintf(buff+desc, "agg:"
2535 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
c33104f0
TW		 2536 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2537 lq_sta->lq.agg_params.agg_dis_start_th,
2538 lq_sta->lq.agg_params.agg_frame_cnt_limit);
5ae212c9
ZY		 2539
2540 desc += sprintf(buff+desc,
2541 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
c33104f0
TW		 2542 lq_sta->lq.general_params.start_rate_index[0],
2543 lq_sta->lq.general_params.start_rate_index[1],
2544 lq_sta->lq.general_params.start_rate_index[2],
2545 lq_sta->lq.general_params.start_rate_index[3]);
5ae212c9
ZY		 2546
2547
2548 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2549 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
c33104f0 2550 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
5ae212c9
ZY		 2551
2552 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2553}
2554
2555static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
98d7e09a 2556 .write = rs_sta_dbgfs_scale_table_write,
5ae212c9
ZY		 2557 .read = rs_sta_dbgfs_scale_table_read,
2558 .open = open_file_generic,
2559};
0209dc11
ZY		 2560static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2561 char __user *user_buf, size_t count, loff_t *ppos)
2562{
2563 char buff[1024];
2564 int desc = 0;
2565 int i, j;
2566
c33104f0 2567 struct iwl4965_lq_sta *lq_sta = file->private_data;
0209dc11
ZY		 2568 for (i = 0; i < LQ_SIZE; i++) {
2569 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2570 "rate=0x%X\n",
c33104f0
TW		 2571 lq_sta->active_tbl == i?"*":"x",
2572 lq_sta->lq_info[i].lq_type,
2573 lq_sta->lq_info[i].is_SGI,
2574 lq_sta->lq_info[i].is_fat,
2575 lq_sta->lq_info[i].is_dup,
39e88504 2576 lq_sta->lq_info[i].current_rate);
0209dc11
ZY		 2577 for (j = 0; j < IWL_RATE_COUNT; j++) {
2578 desc += sprintf(buff+desc,
c33104f0
TW		 2579 "counter=%d success=%d %%=%d\n",
2580 lq_sta->lq_info[i].win[j].counter,
2581 lq_sta->lq_info[i].win[j].success_counter,
2582 lq_sta->lq_info[i].win[j].success_ratio);
0209dc11
ZY		 2583 }
2584 }
2585 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2586}
2587
2588static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2589 .read = rs_sta_dbgfs_stats_table_read,
2590 .open = open_file_generic,
2591};
5ae212c9 2592
93dc646a
ZY		 2593static void rs_add_debugfs(void *priv, void *priv_sta,
2594 struct dentry *dir)
2595{
c33104f0
TW		 2596 struct iwl4965_lq_sta *lq_sta = priv_sta;
2597 lq_sta->rs_sta_dbgfs_scale_table_file =
0209dc11 2598 debugfs_create_file("rate_scale_table", 0600, dir,
c33104f0
TW		 2599 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2600 lq_sta->rs_sta_dbgfs_stats_table_file =
0209dc11 2601 debugfs_create_file("rate_stats_table", 0600, dir,
c33104f0 2602 lq_sta, &rs_sta_dbgfs_stats_table_ops);
0c11b4de
RR		 2603#ifdef CONFIG_IWL4965_HT
2604 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2605 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
2606 &lq_sta->tx_agg_tid_en);
2607#endif
2608
93dc646a
ZY		 2609}
2610
2611static void rs_remove_debugfs(void *priv, void *priv_sta)
2612{
c33104f0
TW		 2613 struct iwl4965_lq_sta *lq_sta = priv_sta;
2614 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2615 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
0c11b4de
RR		 2616#ifdef CONFIG_IWL4965_HT
2617 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2618#endif
93dc646a
ZY		 2619}
2620#endif
2621
b481de9c
ZY		 2622static struct rate_control_ops rs_ops = {
2623 .module = NULL,
2624 .name = RS_NAME,
2625 .tx_status = rs_tx_status,
2626 .get_rate = rs_get_rate,
2627 .rate_init = rs_rate_init,
2628 .clear = rs_clear,
2629 .alloc = rs_alloc,
2630 .free = rs_free,
2631 .alloc_sta = rs_alloc_sta,
2632 .free_sta = rs_free_sta,
93dc646a
ZY		 2633#ifdef CONFIG_MAC80211_DEBUGFS
2634 .add_sta_debugfs = rs_add_debugfs,
2635 .remove_sta_debugfs = rs_remove_debugfs,
2636#endif
b481de9c
ZY		 2637};
2638
bb8c093b 2639int iwl4965_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id)
b481de9c
ZY		 2640{
2641 struct ieee80211_local *local = hw_to_local(hw);
c79dd5b5 2642 struct iwl_priv *priv = hw->priv;
c33104f0 2643 struct iwl4965_lq_sta *lq_sta;
b481de9c 2644 struct sta_info *sta;
c33104f0 2645 int cnt = 0, i;
b481de9c
ZY		 2646 u32 samples = 0, success = 0, good = 0;
2647 unsigned long now = jiffies;
2648 u32 max_time = 0;
2649 u8 lq_type, antenna;
2650
d0709a65
JB		 2651 rcu_read_lock();
2652
b481de9c
ZY		 2653 sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
2654 if (!sta || !sta->rate_ctrl_priv) {
d0709a65 2655 if (sta)
b481de9c 2656 IWL_DEBUG_RATE("leave - no private rate data!\n");
d0709a65 2657 else
b481de9c 2658 IWL_DEBUG_RATE("leave - no station!\n");
d0709a65 2659 rcu_read_unlock();
b481de9c
ZY		 2660 return sprintf(buf, "station %d not found\n", sta_id);
2661 }
2662
c33104f0 2663 lq_sta = (void *)sta->rate_ctrl_priv;
b481de9c 2664
c33104f0 2665 lq_type = lq_sta->lq_info[lq_sta->active_tbl].lq_type;
fde0db31 2666 antenna = lq_sta->lq_info[lq_sta->active_tbl].ant_type;
b481de9c
ZY		 2667
2668 if (is_legacy(lq_type))
2669 i = IWL_RATE_54M_INDEX;
2670 else
2671 i = IWL_RATE_60M_INDEX;
2672 while (1) {
2673 u64 mask;
2674 int j;
c33104f0 2675 int active = lq_sta->active_tbl;
b481de9c 2676
c33104f0
TW		 2677 cnt +=
2678 sprintf(&buf[cnt], " %2dMbs: ", iwl4965_rates[i].ieee / 2);
b481de9c
ZY		 2679
2680 mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1));
2681 for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1)
c33104f0
TW		 2682 buf[cnt++] =
2683 (lq_sta->lq_info[active].win[i].data & mask)
b481de9c
ZY		 2684 ? '1' : '0';
2685
c33104f0
TW		 2686 samples += lq_sta->lq_info[active].win[i].counter;
2687 good += lq_sta->lq_info[active].win[i].success_counter;
2688 success += lq_sta->lq_info[active].win[i].success_counter *
bb8c093b 2689 iwl4965_rates[i].ieee;
b481de9c 2690
c33104f0 2691 if (lq_sta->lq_info[active].win[i].stamp) {
b481de9c
ZY		 2692 int delta =
2693 jiffies_to_msecs(now -
c33104f0 2694 lq_sta->lq_info[active].win[i].stamp);
b481de9c
ZY		 2695
2696 if (delta > max_time)
2697 max_time = delta;
2698
c33104f0 2699 cnt += sprintf(&buf[cnt], "%5dms\n", delta);
b481de9c 2700 } else
c33104f0 2701 buf[cnt++] = '\n';
b481de9c 2702
bb8c093b 2703 j = iwl4965_get_prev_ieee_rate(i);
b481de9c
ZY		 2704 if (j == i)
2705 break;
2706 i = j;
2707 }
2708
2709 /* Display the average rate of all samples taken.
2710 *
77626355 2711 * NOTE: We multiply # of samples by 2 since the IEEE measurement
bb8c093b 2712 * added from iwl4965_rates is actually 2X the rate */
b481de9c 2713 if (samples)
c33104f0 2714 cnt += sprintf(&buf[cnt],
b481de9c
ZY		 2715 "\nAverage rate is %3d.%02dMbs over last %4dms\n"
2716 "%3d%% success (%d good packets over %d tries)\n",
2717 success / (2 * samples), (success * 5 / samples) % 10,
2718 max_time, good * 100 / samples, good, samples);
2719 else
c33104f0
TW		 2720 cnt += sprintf(&buf[cnt], "\nAverage rate: 0Mbs\n");
2721
2722 cnt += sprintf(&buf[cnt], "\nrate scale type %d antenna %d "
b481de9c 2723 "active_search %d rate index %d\n", lq_type, antenna,
8318d78a 2724 lq_sta->search_better_tbl, sta->last_txrate_idx);
b481de9c 2725
d0709a65 2726 rcu_read_unlock();
c33104f0 2727 return cnt;
b481de9c
ZY		 2728}
2729
bb8c093b 2730void iwl4965_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
b481de9c 2731{
c79dd5b5 2732 struct iwl_priv *priv = hw->priv;
b481de9c
ZY		 2733
2734 priv->lq_mngr.lq_ready = 1;
2735}
2736
897e1cf2 2737int iwl4965_rate_control_register(void)
b481de9c 2738{
897e1cf2 2739 return ieee80211_rate_control_register(&rs_ops);
b481de9c
ZY		 2740}
2741
897e1cf2 2742void iwl4965_rate_control_unregister(void)
b481de9c
ZY		 2743{
2744 ieee80211_rate_control_unregister(&rs_ops);
2745}
2746
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