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iwlwifi: use ieee80211_conf to examine rate capabilities
[linux-2.6-block.git] / drivers / net / wireless / iwlwifi / iwl-4965-rs.c
CommitLineData
b481de9c
ZY		 1/******************************************************************************
2 *
eb7ae89c 3 * Copyright(c) 2005 - 2008 Intel Corporation. All rights reserved.
b481de9c
ZY		 4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2 of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
17 *
18 * The full GNU General Public License is included in this distribution in the
19 * file called LICENSE.
20 *
21 * Contact Information:
22 * James P. Ketrenos <ipw2100-admin@linux.intel.com>
23 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
24 *
25 *****************************************************************************/
26#include <linux/kernel.h>
27#include <linux/init.h>
28#include <linux/skbuff.h>
29#include <linux/wireless.h>
30#include <net/mac80211.h>
b481de9c
ZY		 31
32#include <linux/netdevice.h>
33#include <linux/etherdevice.h>
34#include <linux/delay.h>
35
36#include <linux/workqueue.h>
37
2c8dccc7 38#include "../net/mac80211/rate.h"
b481de9c 39
3e0d4cb1 40#include "iwl-dev.h"
857485c0 41#include "iwl-core.h"
b481de9c
ZY		 42#include "iwl-helpers.h"
43
44#define RS_NAME "iwl-4965-rs"
45
aade00ce 46#define NUM_TRY_BEFORE_ANT_TOGGLE 1
b481de9c
ZY		 47#define IWL_NUMBER_TRY 1
48#define IWL_HT_NUMBER_TRY 3
49
77626355
BC		 50#define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
51#define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
52#define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
53
54/* max time to accum history 2 seconds */
55#define IWL_RATE_SCALE_FLUSH_INTVL (2*HZ)
b481de9c
ZY		 56
57static u8 rs_ht_to_legacy[] = {
58 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
59 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
60 IWL_RATE_6M_INDEX,
61 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
62 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
63 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
64 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
65};
66
aade00ce
GC		 67static const u8 ant_toggle_lookup[] = {
68 /*ANT_NONE -> */ ANT_NONE,
69 /*ANT_A -> */ ANT_B,
70 /*ANT_B -> */ ANT_C,
71 /*ANT_AB -> */ ANT_BC,
72 /*ANT_C -> */ ANT_A,
73 /*ANT_AC -> */ ANT_AB,
74 /*ANT_BC -> */ ANT_AC,
75 /*ANT_ABC -> */ ANT_ABC,
76};
77
77626355
BC		 78/**
79 * struct iwl4965_rate_scale_data -- tx success history for one rate
80 */
bb8c093b 81struct iwl4965_rate_scale_data {
77626355
BC		 82 u64 data; /* bitmap of successful frames */
83 s32 success_counter; /* number of frames successful */
84 s32 success_ratio; /* per-cent * 128 */
85 s32 counter; /* number of frames attempted */
86 s32 average_tpt; /* success ratio * expected throughput */
b481de9c
ZY		 87 unsigned long stamp;
88};
89
77626355
BC		 90/**
91 * struct iwl4965_scale_tbl_info -- tx params and success history for all rates
92 *
0c11b4de 93 * There are two of these in struct iwl4965_lq_sta,
77626355
BC		 94 * one for "active", and one for "search".
95 */
bb8c093b 96struct iwl4965_scale_tbl_info {
fde0db31
GC		 97 enum iwl_table_type lq_type;
98 u8 ant_type;
77626355
BC		 99 u8 is_SGI; /* 1 = short guard interval */
100 u8 is_fat; /* 1 = 40 MHz channel width */
101 u8 is_dup; /* 1 = duplicated data streams */
102 u8 action; /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
103 s32 *expected_tpt; /* throughput metrics; expected_tpt_G, etc. */
39e88504 104 u32 current_rate; /* rate_n_flags, uCode API format */
77626355 105 struct iwl4965_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
b481de9c
ZY		 106};
107
0c11b4de
RR		 108struct iwl4965_traffic_load {
109 unsigned long time_stamp; /* age of the oldest statistics */
110 u32 packet_count[TID_QUEUE_MAX_SIZE]; /* packet count in this time
111 * slice */
112 u32 total; /* total num of packets during the
113 * last TID_MAX_TIME_DIFF */
114 u8 queue_count; /* number of queues that has
115 * been used since the last cleanup */
116 u8 head; /* start of the circular buffer */
117};
118
77626355 119/**
0c11b4de 120 * struct iwl4965_lq_sta -- driver's rate scaling private structure
77626355
BC		 121 *
122 * Pointer to this gets passed back and forth between driver and mac80211.
123 */
c33104f0 124struct iwl4965_lq_sta {
77626355
BC		 125 u8 active_tbl; /* index of active table, range 0-1 */
126 u8 enable_counter; /* indicates HT mode */
127 u8 stay_in_tbl; /* 1: disallow, 0: allow search for new mode */
128 u8 search_better_tbl; /* 1: currently trying alternate mode */
b481de9c 129 s32 last_tpt;
77626355
BC		 130
131 /* The following determine when to search for a new mode */
b481de9c 132 u32 table_count_limit;
77626355
BC		 133 u32 max_failure_limit; /* # failed frames before new search */
134 u32 max_success_limit; /* # successful frames before new search */
b481de9c 135 u32 table_count;
77626355
BC		 136 u32 total_failed; /* total failed frames, any/all rates */
137 u32 total_success; /* total successful frames, any/all rates */
138 u32 flush_timer; /* time staying in mode before new search */
139
140 u8 action_counter; /* # mode-switch actions tried */
b481de9c
ZY		 141 u8 is_green;
142 u8 is_dup;
8318d78a 143 enum ieee80211_band band;
b481de9c 144 u8 ibss_sta_added;
77626355
BC		 145
146 /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
02dede04 147 u32 supp_rates;
39e88504 148 u16 active_legacy_rate;
b481de9c 149 u16 active_siso_rate;
fde0db31
GC		 150 u16 active_mimo2_rate;
151 u16 active_mimo3_rate;
b481de9c 152 u16 active_rate_basic;
77626355 153
66c73db7 154 struct iwl_link_quality_cmd lq;
77626355 155 struct iwl4965_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
0c11b4de
RR		 156 struct iwl4965_traffic_load load[TID_MAX_LOAD_COUNT];
157 u8 tx_agg_tid_en;
5ae212c9 158#ifdef CONFIG_MAC80211_DEBUGFS
98d7e09a 159 struct dentry *rs_sta_dbgfs_scale_table_file;
0209dc11 160 struct dentry *rs_sta_dbgfs_stats_table_file;
0c11b4de 161 struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
39e88504 162 u32 dbg_fixed_rate;
5ae212c9 163#endif
6243065d 164 struct iwl_priv *drv;
b481de9c
ZY		 165};
166
c79dd5b5 167static void rs_rate_scale_perform(struct iwl_priv *priv,
b481de9c
ZY		 168 struct net_device *dev,
169 struct ieee80211_hdr *hdr,
170 struct sta_info *sta);
fde0db31
GC		 171static void rs_fill_link_cmd(const struct iwl_priv *priv,
172 struct iwl4965_lq_sta *lq_sta,
07bc28ed 173 u32 rate_n_flags);
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
aade00ce
GC		 246static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
247{
248 return ((ant_type & valid_antenna) == ant_type);
249}
250
0c11b4de
RR		 251/*
252 * removes the old data from the statistics. All data that is older than
253 * TID_MAX_TIME_DIFF, will be deleted.
254 */
255static void rs_tl_rm_old_stats(struct iwl4965_traffic_load *tl, u32 curr_time)
256{
257 /* The oldest age we want to keep */
258 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
259
260 while (tl->queue_count &&
261 (tl->time_stamp < oldest_time)) {
262 tl->total -= tl->packet_count[tl->head];
263 tl->packet_count[tl->head] = 0;
264 tl->time_stamp += TID_QUEUE_CELL_SPACING;
265 tl->queue_count--;
266 tl->head++;
267 if (tl->head >= TID_QUEUE_MAX_SIZE)
268 tl->head = 0;
269 }
270}
271
272/*
273 * increment traffic load value for tid and also remove
274 * any old values if passed the certain time period
275 */
54dbb525
TW		 276static void rs_tl_add_packet(struct iwl4965_lq_sta *lq_data,
277 struct ieee80211_hdr *hdr)
0c11b4de
RR		 278{
279 u32 curr_time = jiffies_to_msecs(jiffies);
280 u32 time_diff;
281 s32 index;
282 struct iwl4965_traffic_load *tl = NULL;
54dbb525
TW		 283 u16 fc = le16_to_cpu(hdr->frame_control);
284 u8 tid;
0c11b4de 285
54dbb525
TW		 286 if (ieee80211_is_qos_data(fc)) {
287 u8 *qc = ieee80211_get_qos_ctrl(hdr, ieee80211_get_hdrlen(fc));
288 tid = qc[0] & 0xf;
289 } else
0c11b4de
RR		 290 return;
291
292 tl = &lq_data->load[tid];
293
294 curr_time -= curr_time % TID_ROUND_VALUE;
295
296 /* Happens only for the first packet. Initialize the data */
297 if (!(tl->queue_count)) {
298 tl->total = 1;
299 tl->time_stamp = curr_time;
300 tl->queue_count = 1;
301 tl->head = 0;
302 tl->packet_count[0] = 1;
303 return;
304 }
305
306 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
307 index = time_diff / TID_QUEUE_CELL_SPACING;
308
309 /* The history is too long: remove data that is older than */
310 /* TID_MAX_TIME_DIFF */
311 if (index >= TID_QUEUE_MAX_SIZE)
312 rs_tl_rm_old_stats(tl, curr_time);
313
314 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
315 tl->packet_count[index] = tl->packet_count[index] + 1;
316 tl->total = tl->total + 1;
317
318 if ((index + 1) > tl->queue_count)
319 tl->queue_count = index + 1;
320}
321
322/*
323 get the traffic load value for tid
324*/
325static u32 rs_tl_get_load(struct iwl4965_lq_sta *lq_data, u8 tid)
326{
327 u32 curr_time = jiffies_to_msecs(jiffies);
328 u32 time_diff;
329 s32 index;
330 struct iwl4965_traffic_load *tl = NULL;
331
332 if (tid >= TID_MAX_LOAD_COUNT)
333 return 0;
334
335 tl = &(lq_data->load[tid]);
336
337 curr_time -= curr_time % TID_ROUND_VALUE;
338
339 if (!(tl->queue_count))
340 return 0;
341
342 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
343 index = time_diff / TID_QUEUE_CELL_SPACING;
344
345 /* The history is too long: remove data that is older than */
346 /* TID_MAX_TIME_DIFF */
347 if (index >= TID_QUEUE_MAX_SIZE)
348 rs_tl_rm_old_stats(tl, curr_time);
349
350 return tl->total;
351}
352
c79dd5b5 353static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
0c11b4de
RR		 354 struct iwl4965_lq_sta *lq_data, u8 tid,
355 struct sta_info *sta)
356{
357 unsigned long state;
358 DECLARE_MAC_BUF(mac);
359
07346f81 360 spin_lock_bh(&sta->lock);
cee24a3e 361 state = sta->ampdu_mlme.tid_state_tx[tid];
07346f81 362 spin_unlock_bh(&sta->lock);
0c11b4de
RR		 363
364 if (state == HT_AGG_STATE_IDLE &&
365 rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
366 IWL_DEBUG_HT("Starting Tx agg: STA: %s tid: %d\n",
367 print_mac(mac, sta->addr), tid);
368 ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
369 }
370}
371
c79dd5b5 372static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
0c11b4de
RR		 373 struct iwl4965_lq_sta *lq_data,
374 struct sta_info *sta)
375{
376 if ((tid < TID_MAX_LOAD_COUNT))
377 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
378 else if (tid == IWL_AGG_ALL_TID)
379 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
380 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
381}
382
39e88504 383static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
fde0db31 384{
39e88504
GC		 385 return (!!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
386 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
387 !!(rate_n_flags & RATE_MCS_ANT_C_MSK));
fde0db31
GC		 388}
389
77626355
BC		 390/**
391 * rs_collect_tx_data - Update the success/failure sliding window
392 *
393 * We keep a sliding window of the last 62 packets transmitted
394 * at this rate. window->data contains the bitmask of successful
395 * packets.
396 */
bb8c093b 397static int rs_collect_tx_data(struct iwl4965_rate_scale_data *windows,
99556438
RR		 398 int scale_index, s32 tpt, int retries,
399 int successes)
b481de9c 400{
bb8c093b 401 struct iwl4965_rate_scale_data *window = NULL;
39e88504 402 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
b481de9c
ZY		 403 s32 fail_count;
404
dc2453ae
TW		 405 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
406 return -EINVAL;
b481de9c 407
77626355 408 /* Select data for current tx bit rate */
b481de9c
ZY		 409 window = &(windows[scale_index]);
410
77626355
BC		 411 /*
412 * Keep track of only the latest 62 tx frame attempts in this rate's
413 * history window; anything older isn't really relevant any more.
414 * If we have filled up the sliding window, drop the oldest attempt;
415 * if the oldest attempt (highest bit in bitmap) shows "success",
416 * subtract "1" from the success counter (this is the main reason
417 * we keep these bitmaps!).
418 */
99556438 419 while (retries > 0) {
39e88504
GC		 420 if (window->counter >= IWL_RATE_MAX_WINDOW) {
421
422 /* remove earliest */
423 window->counter = IWL_RATE_MAX_WINDOW - 1;
424
99556438
RR		 425 if (window->data & mask) {
426 window->data &= ~mask;
39e88504 427 window->success_counter--;
99556438 428 }
b481de9c 429 }
b481de9c 430
99556438
RR		 431 /* Increment frames-attempted counter */
432 window->counter++;
433
434 /* Shift bitmap by one frame (throw away oldest history),
435 * OR in "1", and increment "success" if this
436 * frame was successful. */
39e88504 437 window->data <<= 1;;
99556438 438 if (successes > 0) {
39e88504 439 window->success_counter++;
99556438
RR		 440 window->data |= 0x1;
441 successes--;
442 }
77626355 443
99556438 444 retries--;
b481de9c
ZY		 445 }
446
77626355 447 /* Calculate current success ratio, avoid divide-by-0! */
b481de9c
ZY		 448 if (window->counter > 0)
449 window->success_ratio = 128 * (100 * window->success_counter)
450 / window->counter;
451 else
452 window->success_ratio = IWL_INVALID_VALUE;
453
454 fail_count = window->counter - window->success_counter;
455
77626355 456 /* Calculate average throughput, if we have enough history. */
b481de9c
ZY		 457 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
458 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
459 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
460 else
461 window->average_tpt = IWL_INVALID_VALUE;
462
77626355 463 /* Tag this window as having been updated */
b481de9c
ZY		 464 window->stamp = jiffies;
465
dc2453ae 466 return 0;
b481de9c
ZY		 467}
468
77626355
BC		 469/*
470 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
471 */
39e88504
GC		 472/* FIXME:RS:remove this function and put the flags statically in the table */
473static u32 rate_n_flags_from_tbl(struct iwl4965_scale_tbl_info *tbl,
474 int index, u8 use_green)
b481de9c 475{
39e88504
GC		 476 u32 rate_n_flags = 0;
477
b481de9c 478 if (is_legacy(tbl->lq_type)) {
1826dcc0 479 rate_n_flags = iwl_rates[index].plcp;
b481de9c 480 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
39e88504 481 rate_n_flags |= RATE_MCS_CCK_MSK;
b481de9c 482
fde0db31
GC		 483 } else if (is_Ht(tbl->lq_type)) {
484 if (index > IWL_LAST_OFDM_RATE) {
485 IWL_ERROR("invalid HT rate index %d\n", index);
b481de9c 486 index = IWL_LAST_OFDM_RATE;
fde0db31 487 }
39e88504 488 rate_n_flags = RATE_MCS_HT_MSK;
fde0db31
GC		 489
490 if (is_siso(tbl->lq_type))
1826dcc0 491 rate_n_flags |= iwl_rates[index].plcp_siso;
fde0db31 492 else if (is_mimo2(tbl->lq_type))
1826dcc0 493 rate_n_flags |= iwl_rates[index].plcp_mimo2;
fde0db31 494 else
1826dcc0 495 rate_n_flags |= iwl_rates[index].plcp_mimo3;
b481de9c 496 } else {
fde0db31 497 IWL_ERROR("Invalid tbl->lq_type %d\n", tbl->lq_type);
b481de9c
ZY		 498 }
499
39e88504 500 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
fde0db31 501 RATE_MCS_ANT_ABC_MSK);
b481de9c 502
39e88504
GC		 503 if (is_Ht(tbl->lq_type)) {
504 if (tbl->is_fat) {
505 if (tbl->is_dup)
506 rate_n_flags |= RATE_MCS_DUP_MSK;
507 else
508 rate_n_flags |= RATE_MCS_FAT_MSK;
509 }
510 if (tbl->is_SGI)
511 rate_n_flags |= RATE_MCS_SGI_MSK;
512
513 if (use_green) {
514 rate_n_flags |= RATE_MCS_GF_MSK;
515 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
516 rate_n_flags &= ~RATE_MCS_SGI_MSK;
517 IWL_ERROR("GF was set with SGI:SISO\n");
518 }
519 }
b481de9c 520 }
39e88504 521 return rate_n_flags;
b481de9c
ZY		 522}
523
77626355
BC		 524/*
525 * Interpret uCode API's rate_n_flags format,
526 * fill "search" or "active" tx mode table.
527 */
39e88504 528static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
8318d78a
JB		 529 enum ieee80211_band band,
530 struct iwl4965_scale_tbl_info *tbl,
b481de9c
ZY		 531 int *rate_idx)
532{
39e88504
GC		 533 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
534 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
535 u8 mcs;
b481de9c 536
39e88504 537 *rate_idx = iwl4965_hwrate_to_plcp_idx(rate_n_flags);
b481de9c 538
fde0db31 539 if (*rate_idx == IWL_RATE_INVALID) {
b481de9c 540 *rate_idx = -1;
dc2453ae 541 return -EINVAL;
b481de9c 542 }
77626355 543 tbl->is_SGI = 0; /* default legacy setup */
b481de9c
ZY		 544 tbl->is_fat = 0;
545 tbl->is_dup = 0;
fde0db31
GC		 546 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
547 tbl->lq_type = LQ_NONE;
b481de9c 548
77626355 549 /* legacy rate format */
39e88504 550 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
fde0db31 551 if (num_of_ant == 1) {
8318d78a 552 if (band == IEEE80211_BAND_5GHZ)
b481de9c
ZY		 553 tbl->lq_type = LQ_A;
554 else
555 tbl->lq_type = LQ_G;
b481de9c 556 }
fde0db31 557 /* HT rate format */
b481de9c 558 } else {
39e88504 559 if (rate_n_flags & RATE_MCS_SGI_MSK)
b481de9c
ZY		 560 tbl->is_SGI = 1;
561
39e88504
GC		 562 if ((rate_n_flags & RATE_MCS_FAT_MSK) ||
563 (rate_n_flags & RATE_MCS_DUP_MSK))
b481de9c
ZY		 564 tbl->is_fat = 1;
565
39e88504 566 if (rate_n_flags & RATE_MCS_DUP_MSK)
b481de9c 567 tbl->is_dup = 1;
fde0db31 568
39e88504 569 mcs = rs_extract_rate(rate_n_flags);
fde0db31 570
39e88504
GC		 571 /* SISO */
572 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
fde0db31
GC		 573 if (num_of_ant == 1)
574 tbl->lq_type = LQ_SISO; /*else NONE*/
575 /* MIMO2 */
39e88504 576 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
fde0db31
GC		 577 if (num_of_ant == 2)
578 tbl->lq_type = LQ_MIMO2;
579 /* MIMO3 */
580 } else {
581 if (num_of_ant == 3)
582 tbl->lq_type = LQ_MIMO3;
583 }
b481de9c
ZY		 584 }
585 return 0;
586}
aade00ce
GC		 587
588/* switch to another antenna/antennas and return 1 */
589/* if no other valid antenna found, return 0 */
590static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
591 struct iwl4965_scale_tbl_info *tbl)
b481de9c 592{
aade00ce
GC		 593 u8 new_ant_type;
594
595 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
596 return 0;
597
598 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
599 return 0;
600
601 new_ant_type = ant_toggle_lookup[tbl->ant_type];
602
603 while ((new_ant_type != tbl->ant_type) &&
604 !rs_is_valid_ant(valid_ant, new_ant_type))
605 new_ant_type = ant_toggle_lookup[new_ant_type];
606
607 if (new_ant_type == tbl->ant_type)
608 return 0;
609
610 tbl->ant_type = new_ant_type;
611 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
612 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
613 return 1;
b481de9c
ZY		 614}
615
39e88504 616/* FIXME:RS: in 4965 we don't use greenfield at all */
f935a6da 617/* FIXME:RS: don't use greenfield for now in TX */
f935a6da
GC		 618#if 0
619static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
b481de9c 620{
270243a5
RR		 621 return ((conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) &&
622 priv->current_ht_config.is_green_field &&
623 !priv->current_ht_config.non_GF_STA_present);
f935a6da 624}
4f85f5b3 625#endif
f935a6da
GC		 626static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
627{
dc2453ae 628 return 0;
b481de9c
ZY		 629}
630
631/**
632 * rs_get_supported_rates - get the available rates
633 *
634 * if management frame or broadcast frame only return
635 * basic available rates.
636 *
637 */
eecd6e57 638static u16 rs_get_supported_rates(struct iwl4965_lq_sta *lq_sta,
b481de9c 639 struct ieee80211_hdr *hdr,
eecd6e57 640 enum iwl_table_type rate_type)
b481de9c 641{
eecd6e57
GC		 642 if (hdr && is_multicast_ether_addr(hdr->addr1) &&
643 lq_sta->active_rate_basic)
644 return lq_sta->active_rate_basic;
645
646 if (is_legacy(rate_type)) {
647 return lq_sta->active_legacy_rate;
648 } else {
b481de9c 649 if (is_siso(rate_type))
eecd6e57 650 return lq_sta->active_siso_rate;
fde0db31 651 else if (is_mimo2(rate_type))
eecd6e57 652 return lq_sta->active_mimo2_rate;
b481de9c 653 else
eecd6e57 654 return lq_sta->active_mimo3_rate;
c33104f0 655 }
b481de9c
ZY		 656}
657
bf403db8
EK		 658static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
659 int rate_type)
b481de9c
ZY		 660{
661 u8 high = IWL_RATE_INVALID;
662 u8 low = IWL_RATE_INVALID;
663
01ebd063 664 /* 802.11A or ht walks to the next literal adjacent rate in
b481de9c
ZY		 665 * the rate table */
666 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
667 int i;
668 u32 mask;
669
670 /* Find the previous rate that is in the rate mask */
671 i = index - 1;
672 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
673 if (rate_mask & mask) {
674 low = i;
675 break;
676 }
677 }
678
679 /* Find the next rate that is in the rate mask */
680 i = index + 1;
681 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
682 if (rate_mask & mask) {
683 high = i;
684 break;
685 }
686 }
687
688 return (high << 8) | low;
689 }
690
691 low = index;
692 while (low != IWL_RATE_INVALID) {
1826dcc0 693 low = iwl_rates[low].prev_rs;
b481de9c
ZY		 694 if (low == IWL_RATE_INVALID)
695 break;
696 if (rate_mask & (1 << low))
697 break;
698 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
699 }
700
701 high = index;
702 while (high != IWL_RATE_INVALID) {
1826dcc0 703 high = iwl_rates[high].next_rs;
b481de9c
ZY		 704 if (high == IWL_RATE_INVALID)
705 break;
706 if (rate_mask & (1 << high))
707 break;
708 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
709 }
710
711 return (high << 8) | low;
712}
713
39e88504 714static u32 rs_get_lower_rate(struct iwl4965_lq_sta *lq_sta,
bb8c093b 715 struct iwl4965_scale_tbl_info *tbl, u8 scale_index,
39e88504 716 u8 ht_possible)
b481de9c 717{
b481de9c
ZY		 718 s32 low;
719 u16 rate_mask;
720 u16 high_low;
721 u8 switch_to_legacy = 0;
c33104f0 722 u8 is_green = lq_sta->is_green;
b481de9c
ZY		 723
724 /* check if we need to switch from HT to legacy rates.
725 * assumption is that mandatory rates (1Mbps or 6Mbps)
726 * are always supported (spec demand) */
727 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
728 switch_to_legacy = 1;
729 scale_index = rs_ht_to_legacy[scale_index];
8318d78a 730 if (lq_sta->band == IEEE80211_BAND_5GHZ)
b481de9c
ZY		 731 tbl->lq_type = LQ_A;
732 else
733 tbl->lq_type = LQ_G;
734
69fdb309 735 if (num_of_ant(tbl->ant_type) > 1)
fde0db31 736 tbl->ant_type = ANT_A;/*FIXME:RS*/
b481de9c
ZY		 737
738 tbl->is_fat = 0;
739 tbl->is_SGI = 0;
740 }
741
eecd6e57 742 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
b481de9c 743
77626355 744 /* Mask with station rate restriction */
b481de9c 745 if (is_legacy(tbl->lq_type)) {
77626355 746 /* supp_rates has no CCK bits in A mode */
8318d78a 747 if (lq_sta->band == IEEE80211_BAND_5GHZ)
b481de9c 748 rate_mask = (u16)(rate_mask &
c33104f0 749 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
b481de9c 750 else
c33104f0 751 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
b481de9c
ZY		 752 }
753
77626355 754 /* If we switched from HT to legacy, check current rate */
dc2453ae 755 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
39e88504
GC		 756 low = scale_index;
757 goto out;
b481de9c
ZY		 758 }
759
bf403db8
EK		 760 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
761 tbl->lq_type);
b481de9c
ZY		 762 low = high_low & 0xff;
763
39e88504
GC		 764 if (low == IWL_RATE_INVALID)
765 low = scale_index;
766
767out:
768 return rate_n_flags_from_tbl(tbl, low, is_green);
b481de9c
ZY		 769}
770
77626355
BC		 771/*
772 * mac80211 sends us Tx status
773 */
c33104f0 774static void rs_tx_status(void *priv_rate, struct net_device *dev,
e039fa4a 775 struct sk_buff *skb)
b481de9c
ZY		 776{
777 int status;
778 u8 retries;
779 int rs_index, index = 0;
c33104f0 780 struct iwl4965_lq_sta *lq_sta;
66c73db7 781 struct iwl_link_quality_cmd *table;
b481de9c
ZY		 782 struct sta_info *sta;
783 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
c79dd5b5 784 struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
b481de9c 785 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
4c424e4c 786 struct ieee80211_hw *hw = local_to_hw(local);
e039fa4a 787 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
bb8c093b
CH		 788 struct iwl4965_rate_scale_data *window = NULL;
789 struct iwl4965_rate_scale_data *search_win = NULL;
39e88504 790 u32 tx_rate;
bb8c093b
CH		 791 struct iwl4965_scale_tbl_info tbl_type;
792 struct iwl4965_scale_tbl_info *curr_tbl, *search_tbl;
b481de9c
ZY		 793 u8 active_index = 0;
794 u16 fc = le16_to_cpu(hdr->frame_control);
795 s32 tpt = 0;
796
58826351 797 IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
b481de9c
ZY		 798
799 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1))
800 return;
801
99556438 802 /* This packet was aggregated but doesn't carry rate scale info */
e039fa4a
JB		 803 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
804 !(info->flags & IEEE80211_TX_STAT_AMPDU))
99556438
RR		 805 return;
806
e039fa4a 807 retries = info->status.retry_count;
b481de9c
ZY		 808
809 if (retries > 15)
810 retries = 15;
811
d0709a65 812 rcu_read_lock();
b481de9c
ZY		 813
814 sta = sta_info_get(local, hdr->addr1);
815
f4d6082d
TW		 816 if (!sta || !sta->rate_ctrl_priv)
817 goto out;
818
b481de9c 819
c33104f0 820 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
b481de9c
ZY		 821
822 if (!priv->lq_mngr.lq_ready)
f4d6082d 823 goto out;
b481de9c 824
c33104f0
TW		 825 if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
826 !lq_sta->ibss_sta_added)
f4d6082d 827 goto out;
b481de9c 828
c33104f0
TW		 829 table = &lq_sta->lq;
830 active_index = lq_sta->active_tbl;
b481de9c 831
c33104f0
TW		 832 curr_tbl = &(lq_sta->lq_info[active_index]);
833 search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
bb8c093b 834 window = (struct iwl4965_rate_scale_data *)
b481de9c 835 &(curr_tbl->win[0]);
bb8c093b 836 search_win = (struct iwl4965_rate_scale_data *)
b481de9c
ZY		 837 &(search_tbl->win[0]);
838
77626355
BC		 839 /*
840 * Ignore this Tx frame response if its initial rate doesn't match
841 * that of latest Link Quality command. There may be stragglers
842 * from a previous Link Quality command, but we're no longer interested
843 * in those; they're either from the "active" mode while we're trying
844 * to check "search" mode, or a prior "search" mode after we've moved
845 * to a new "search" mode (which might become the new "active" mode).
846 */
39e88504
GC		 847 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
848 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
4c424e4c
RR		 849 if (priv->band == IEEE80211_BAND_5GHZ)
850 rs_index -= IWL_FIRST_OFDM_RATE;
851
e039fa4a 852 if ((info->tx_rate_idx < 0) ||
4c424e4c 853 (tbl_type.is_SGI ^
e039fa4a 854 !!(info->flags & IEEE80211_TX_CTL_SHORT_GI)) ||
4c424e4c 855 (tbl_type.is_fat ^
e039fa4a 856 !!(info->flags & IEEE80211_TX_CTL_40_MHZ_WIDTH)) ||
4c424e4c 857 (tbl_type.is_dup ^
e039fa4a
JB		 858 !!(info->flags & IEEE80211_TX_CTL_DUP_DATA)) ||
859 (tbl_type.ant_type ^ info->antenna_sel_tx) ||
39e88504 860 (!!(tx_rate & RATE_MCS_HT_MSK) ^
e039fa4a 861 !!(info->flags & IEEE80211_TX_CTL_OFDM_HT)) ||
39e88504 862 (!!(tx_rate & RATE_MCS_GF_MSK) ^
e039fa4a 863 !!(info->flags & IEEE80211_TX_CTL_GREEN_FIELD)) ||
4c424e4c 864 (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
e039fa4a 865 hw->wiphy->bands[info->band]->bitrates[info->tx_rate_idx].bitrate)) {
39e88504 866 IWL_DEBUG_RATE("initial rate does not match 0x%x\n", tx_rate);
f4d6082d 867 goto out;
b481de9c
ZY		 868 }
869
77626355 870 /* Update frame history window with "failure" for each Tx retry. */
b481de9c 871 while (retries) {
77626355
BC		 872 /* Look up the rate and other info used for each tx attempt.
873 * Each tx attempt steps one entry deeper in the rate table. */
39e88504
GC		 874 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
875 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
b481de9c
ZY		 876 &tbl_type, &rs_index);
877
77626355
BC		 878 /* If type matches "search" table,
879 * add failure to "search" history */
b481de9c 880 if ((tbl_type.lq_type == search_tbl->lq_type) &&
fde0db31 881 (tbl_type.ant_type == search_tbl->ant_type) &&
b481de9c
ZY		 882 (tbl_type.is_SGI == search_tbl->is_SGI)) {
883 if (search_tbl->expected_tpt)
884 tpt = search_tbl->expected_tpt[rs_index];
885 else
886 tpt = 0;
99556438 887 rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
77626355
BC		 888
889 /* Else if type matches "current/active" table,
890 * add failure to "current/active" history */
b481de9c 891 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
fde0db31 892 (tbl_type.ant_type == curr_tbl->ant_type) &&
b481de9c
ZY		 893 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
894 if (curr_tbl->expected_tpt)
895 tpt = curr_tbl->expected_tpt[rs_index];
896 else
897 tpt = 0;
99556438 898 rs_collect_tx_data(window, rs_index, tpt, 1, 0);
b481de9c 899 }
77626355
BC		 900
901 /* If not searching for a new mode, increment failed counter
902 * ... this helps determine when to start searching again */
c33104f0
TW		 903 if (lq_sta->stay_in_tbl)
904 lq_sta->total_failed++;
b481de9c
ZY		 905 --retries;
906 index++;
907
908 }
909
77626355
BC		 910 /*
911 * Find (by rate) the history window to update with final Tx attempt;
912 * if Tx was successful first try, use original rate,
913 * else look up the rate that was, finally, successful.
914 */
39e88504
GC		 915 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
916 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
b481de9c 917
77626355 918 /* Update frame history window with "success" if Tx got ACKed ... */
e039fa4a 919 status = !!(info->flags & IEEE80211_TX_STAT_ACK);
b481de9c 920
77626355
BC		 921 /* If type matches "search" table,
922 * add final tx status to "search" history */
b481de9c 923 if ((tbl_type.lq_type == search_tbl->lq_type) &&
fde0db31 924 (tbl_type.ant_type == search_tbl->ant_type) &&
b481de9c
ZY		 925 (tbl_type.is_SGI == search_tbl->is_SGI)) {
926 if (search_tbl->expected_tpt)
927 tpt = search_tbl->expected_tpt[rs_index];
928 else
929 tpt = 0;
e039fa4a 930 if (info->flags & IEEE80211_TX_CTL_AMPDU)
99556438 931 rs_collect_tx_data(search_win, rs_index, tpt,
e039fa4a
JB		 932 info->status.ampdu_ack_len,
933 info->status.ampdu_ack_map);
99556438
RR		 934 else
935 rs_collect_tx_data(search_win, rs_index, tpt,
936 1, status);
77626355
BC		 937 /* Else if type matches "current/active" table,
938 * add final tx status to "current/active" history */
b481de9c 939 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
fde0db31 940 (tbl_type.ant_type == curr_tbl->ant_type) &&
b481de9c
ZY		 941 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
942 if (curr_tbl->expected_tpt)
943 tpt = curr_tbl->expected_tpt[rs_index];
944 else
945 tpt = 0;
e039fa4a 946 if (info->flags & IEEE80211_TX_CTL_AMPDU)
99556438 947 rs_collect_tx_data(window, rs_index, tpt,
e039fa4a
JB		 948 info->status.ampdu_ack_len,
949 info->status.ampdu_ack_map);
99556438
RR		 950 else
951 rs_collect_tx_data(window, rs_index, tpt,
952 1, status);
b481de9c
ZY		 953 }
954
77626355
BC		 955 /* If not searching for new mode, increment success/failed counter
956 * ... these help determine when to start searching again */
c33104f0 957 if (lq_sta->stay_in_tbl) {
e039fa4a
JB		 958 if (info->flags & IEEE80211_TX_CTL_AMPDU) {
959 lq_sta->total_success += info->status.ampdu_ack_map;
99556438 960 lq_sta->total_failed +=
e039fa4a 961 (info->status.ampdu_ack_len - info->status.ampdu_ack_map);
99556438
RR		 962 } else {
963 if (status)
964 lq_sta->total_success++;
965 else
966 lq_sta->total_failed++;
967 }
b481de9c
ZY		 968 }
969
77626355 970 /* See if there's a better rate or modulation mode to try. */
b481de9c 971 rs_rate_scale_perform(priv, dev, hdr, sta);
f4d6082d 972out:
d0709a65 973 rcu_read_unlock();
b481de9c
ZY		 974 return;
975}
976
77626355
BC		 977/*
978 * Begin a period of staying with a selected modulation mode.
979 * Set "stay_in_tbl" flag to prevent any mode switches.
980 * Set frame tx success limits according to legacy vs. high-throughput,
981 * and reset overall (spanning all rates) tx success history statistics.
982 * These control how long we stay using same modulation mode before
983 * searching for a new mode.
984 */
bf403db8 985static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
c33104f0 986 struct iwl4965_lq_sta *lq_sta)
b481de9c 987{
eecd6e57 988 IWL_DEBUG_RATE("we are staying in the same table\n");
c33104f0 989 lq_sta->stay_in_tbl = 1; /* only place this gets set */
b481de9c 990 if (is_legacy) {
c33104f0
TW		 991 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
992 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
993 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
b481de9c 994 } else {
c33104f0
TW		 995 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
996 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
997 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
b481de9c 998 }
c33104f0
TW		 999 lq_sta->table_count = 0;
1000 lq_sta->total_failed = 0;
1001 lq_sta->total_success = 0;
b481de9c
ZY		 1002}
1003
77626355
BC		 1004/*
1005 * Find correct throughput table for given mode of modulation
1006 */
eecd6e57 1007static void rs_set_expected_tpt_table(struct iwl4965_lq_sta *lq_sta,
bb8c093b 1008 struct iwl4965_scale_tbl_info *tbl)
b481de9c
ZY		 1009{
1010 if (is_legacy(tbl->lq_type)) {
1011 if (!is_a_band(tbl->lq_type))
1012 tbl->expected_tpt = expected_tpt_G;
1013 else
1014 tbl->expected_tpt = expected_tpt_A;
1015 } else if (is_siso(tbl->lq_type)) {
c33104f0 1016 if (tbl->is_fat && !lq_sta->is_dup)
b481de9c
ZY		 1017 if (tbl->is_SGI)
1018 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
1019 else
1020 tbl->expected_tpt = expected_tpt_siso40MHz;
1021 else if (tbl->is_SGI)
1022 tbl->expected_tpt = expected_tpt_siso20MHzSGI;
1023 else
1024 tbl->expected_tpt = expected_tpt_siso20MHz;
1025
fde0db31 1026 } else if (is_mimo(tbl->lq_type)) { /* FIXME:need to separate mimo2/3 */
c33104f0 1027 if (tbl->is_fat && !lq_sta->is_dup)
b481de9c
ZY		 1028 if (tbl->is_SGI)
1029 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
1030 else
1031 tbl->expected_tpt = expected_tpt_mimo40MHz;
1032 else if (tbl->is_SGI)
1033 tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
1034 else
1035 tbl->expected_tpt = expected_tpt_mimo20MHz;
1036 } else
1037 tbl->expected_tpt = expected_tpt_G;
1038}
1039
77626355
BC		 1040/*
1041 * Find starting rate for new "search" high-throughput mode of modulation.
1042 * Goal is to find lowest expected rate (under perfect conditions) that is
1043 * above the current measured throughput of "active" mode, to give new mode
1044 * a fair chance to prove itself without too many challenges.
1045 *
1046 * This gets called when transitioning to more aggressive modulation
1047 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1048 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1049 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1050 * bit rate will typically need to increase, but not if performance was bad.
1051 */
c79dd5b5 1052static s32 rs_get_best_rate(struct iwl_priv *priv,
c33104f0 1053 struct iwl4965_lq_sta *lq_sta,
77626355 1054 struct iwl4965_scale_tbl_info *tbl, /* "search" */
f935a6da 1055 u16 rate_mask, s8 index)
b481de9c 1056{
77626355 1057 /* "active" values */
bb8c093b 1058 struct iwl4965_scale_tbl_info *active_tbl =
c33104f0 1059 &(lq_sta->lq_info[lq_sta->active_tbl]);
b481de9c 1060 s32 active_sr = active_tbl->win[index].success_ratio;
b481de9c 1061 s32 active_tpt = active_tbl->expected_tpt[index];
77626355
BC		 1062
1063 /* expected "search" throughput */
1064 s32 *tpt_tbl = tbl->expected_tpt;
1065
1066 s32 new_rate, high, low, start_hi;
b481de9c 1067 u16 high_low;
f935a6da 1068 s8 rate = index;
b481de9c
ZY		 1069
1070 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1071
1072 for (; ;) {
bf403db8
EK		 1073 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1074 tbl->lq_type);
b481de9c
ZY		 1075
1076 low = high_low & 0xff;
1077 high = (high_low >> 8) & 0xff;
1078
77626355
BC		 1079 /*
1080 * Lower the "search" bit rate, to give new "search" mode
1081 * approximately the same throughput as "active" if:
1082 *
1083 * 1) "Active" mode has been working modestly well (but not
1084 * great), and expected "search" throughput (under perfect
1085 * conditions) at candidate rate is above the actual
1086 * measured "active" throughput (but less than expected
1087 * "active" throughput under perfect conditions).
1088 * OR
1089 * 2) "Active" mode has been working perfectly or very well
1090 * and expected "search" throughput (under perfect
1091 * conditions) at candidate rate is above expected
1092 * "active" throughput (under perfect conditions).
1093 */
c33104f0 1094 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
b481de9c
ZY		 1095 ((active_sr > IWL_RATE_DECREASE_TH) &&
1096 (active_sr <= IWL_RATE_HIGH_TH) &&
1097 (tpt_tbl[rate] <= active_tpt))) ||
1098 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1099 (tpt_tbl[rate] > active_tpt))) {
1100
77626355
BC		 1101 /* (2nd or later pass)
1102 * If we've already tried to raise the rate, and are
1103 * now trying to lower it, use the higher rate. */
b481de9c
ZY		 1104 if (start_hi != IWL_RATE_INVALID) {
1105 new_rate = start_hi;
1106 break;
1107 }
77626355 1108
b481de9c 1109 new_rate = rate;
77626355
BC		 1110
1111 /* Loop again with lower rate */
b481de9c
ZY		 1112 if (low != IWL_RATE_INVALID)
1113 rate = low;
77626355
BC		 1114
1115 /* Lower rate not available, use the original */
b481de9c
ZY		 1116 else
1117 break;
77626355
BC		 1118
1119 /* Else try to raise the "search" rate to match "active" */
b481de9c 1120 } else {
77626355
BC		 1121 /* (2nd or later pass)
1122 * If we've already tried to lower the rate, and are
1123 * now trying to raise it, use the lower rate. */
b481de9c
ZY		 1124 if (new_rate != IWL_RATE_INVALID)
1125 break;
77626355
BC		 1126
1127 /* Loop again with higher rate */
b481de9c
ZY		 1128 else if (high != IWL_RATE_INVALID) {
1129 start_hi = high;
1130 rate = high;
77626355
BC		 1131
1132 /* Higher rate not available, use the original */
b481de9c 1133 } else {
b481de9c
ZY		 1134 break;
1135 }
1136 }
1137 }
1138
1139 return new_rate;
1140}
b481de9c 1141
77626355
BC		 1142/*
1143 * Set up search table for MIMO
1144 */
fde0db31 1145static int rs_switch_to_mimo2(struct iwl_priv *priv,
c33104f0 1146 struct iwl4965_lq_sta *lq_sta,
270243a5
RR		 1147 struct ieee80211_conf *conf,
1148 struct sta_info *sta,
bb8c093b 1149 struct iwl4965_scale_tbl_info *tbl, int index)
b481de9c 1150{
b481de9c
ZY		 1151 u16 rate_mask;
1152 s32 rate;
c33104f0 1153 s8 is_green = lq_sta->is_green;
b481de9c 1154
270243a5
RR		 1155 if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1156 !sta->ht_info.ht_supported)
b481de9c
ZY		 1157 return -1;
1158
270243a5 1159 if (priv->current_ht_config.tx_mimo_ps_mode == IWL_MIMO_PS_STATIC)
b481de9c
ZY		 1160 return -1;
1161
77626355 1162 /* Need both Tx chains/antennas to support MIMO */
aade00ce 1163 if (priv->hw_params.tx_chains_num < 2)
b481de9c
ZY		 1164 return -1;
1165
eecd6e57 1166 IWL_DEBUG_RATE("LQ: try to switch to MIMO2\n");
39e88504
GC		 1167
1168 tbl->lq_type = LQ_MIMO2;
c33104f0 1169 tbl->is_dup = lq_sta->is_dup;
b481de9c 1170 tbl->action = 0;
39e88504
GC		 1171 rate_mask = lq_sta->active_mimo2_rate;
1172
270243a5 1173 if (priv->current_ht_config.supported_chan_width
39e88504 1174 == IWL_CHANNEL_WIDTH_40MHZ)
b481de9c
ZY		 1175 tbl->is_fat = 1;
1176 else
1177 tbl->is_fat = 0;
1178
39e88504 1179 /* FIXME: - don't toggle SGI here
b481de9c 1180 if (tbl->is_fat) {
270243a5 1181 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
b481de9c
ZY		 1182 tbl->is_SGI = 1;
1183 else
1184 tbl->is_SGI = 0;
270243a5 1185 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
b481de9c
ZY		 1186 tbl->is_SGI = 1;
1187 else
1188 tbl->is_SGI = 0;
39e88504 1189 */
b481de9c 1190
eecd6e57 1191 rs_set_expected_tpt_table(lq_sta, tbl);
b481de9c 1192
f935a6da 1193 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
b481de9c 1194
eecd6e57 1195 IWL_DEBUG_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
39e88504
GC		 1196
1197 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
eecd6e57 1198 IWL_DEBUG_RATE("Can't switch with index %d rate mask %x\n",
39e88504 1199 rate, rate_mask);
b481de9c 1200 return -1;
39e88504
GC		 1201 }
1202 tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
b481de9c 1203
eecd6e57 1204 IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
39e88504 1205 tbl->current_rate, is_green);
dc2453ae 1206 return 0;
fde0db31 1207}
b481de9c 1208
77626355
BC		 1209/*
1210 * Set up search table for SISO
1211 */
c79dd5b5 1212static int rs_switch_to_siso(struct iwl_priv *priv,
c33104f0 1213 struct iwl4965_lq_sta *lq_sta,
270243a5
RR		 1214 struct ieee80211_conf *conf,
1215 struct sta_info *sta,
bb8c093b 1216 struct iwl4965_scale_tbl_info *tbl, int index)
b481de9c 1217{
b481de9c 1218 u16 rate_mask;
c33104f0 1219 u8 is_green = lq_sta->is_green;
b481de9c
ZY		 1220 s32 rate;
1221
270243a5
RR		 1222 if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1223 !sta->ht_info.ht_supported)
b481de9c
ZY		 1224 return -1;
1225
eecd6e57 1226 IWL_DEBUG_RATE("LQ: try to switch to SISO\n");
39e88504 1227
c33104f0 1228 tbl->is_dup = lq_sta->is_dup;
b481de9c
ZY		 1229 tbl->lq_type = LQ_SISO;
1230 tbl->action = 0;
39e88504 1231 rate_mask = lq_sta->active_siso_rate;
b481de9c 1232
270243a5
RR		 1233 if (priv->current_ht_config.supported_chan_width
1234 == IWL_CHANNEL_WIDTH_40MHZ)
b481de9c
ZY		 1235 tbl->is_fat = 1;
1236 else
1237 tbl->is_fat = 0;
1238
39e88504 1239 /* FIXME: - don't toggle SGI here
b481de9c 1240 if (tbl->is_fat) {
270243a5 1241 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
b481de9c
ZY		 1242 tbl->is_SGI = 1;
1243 else
1244 tbl->is_SGI = 0;
270243a5 1245 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
b481de9c
ZY		 1246 tbl->is_SGI = 1;
1247 else
1248 tbl->is_SGI = 0;
39e88504 1249 */
b481de9c
ZY		 1250
1251 if (is_green)
39e88504 1252 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
b481de9c 1253
eecd6e57 1254 rs_set_expected_tpt_table(lq_sta, tbl);
f935a6da 1255 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
b481de9c 1256
eecd6e57 1257 IWL_DEBUG_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask);
b481de9c 1258 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
eecd6e57 1259 IWL_DEBUG_RATE("can not switch with index %d rate mask %x\n",
b481de9c
ZY		 1260 rate, rate_mask);
1261 return -1;
1262 }
39e88504 1263 tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
eecd6e57 1264 IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
39e88504 1265 tbl->current_rate, is_green);
403ab56b 1266 return 0;
b481de9c
ZY		 1267}
1268
77626355
BC		 1269/*
1270 * Try to switch to new modulation mode from legacy
1271 */
c79dd5b5 1272static int rs_move_legacy_other(struct iwl_priv *priv,
c33104f0 1273 struct iwl4965_lq_sta *lq_sta,
270243a5
RR		 1274 struct ieee80211_conf *conf,
1275 struct sta_info *sta,
b481de9c
ZY		 1276 int index)
1277{
bb8c093b 1278 struct iwl4965_scale_tbl_info *tbl =
c33104f0 1279 &(lq_sta->lq_info[lq_sta->active_tbl]);
bb8c093b 1280 struct iwl4965_scale_tbl_info *search_tbl =
c33104f0 1281 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
bb8c093b
CH		 1282 struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1283 u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1284 (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
b481de9c 1285 u8 start_action = tbl->action;
fde0db31
GC		 1286 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1287 int ret = 0;
b481de9c
ZY		 1288
1289 for (; ;) {
1290 switch (tbl->action) {
1291 case IWL_LEGACY_SWITCH_ANTENNA:
f935a6da 1292 IWL_DEBUG_RATE("LQ: Legacy toggle Antenna\n");
b481de9c 1293
c33104f0 1294 lq_sta->action_counter++;
77626355
BC		 1295
1296 /* Don't change antenna if success has been great */
b481de9c
ZY		 1297 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1298 break;
77626355 1299
77626355 1300 /* Set up search table to try other antenna */
b481de9c
ZY		 1301 memcpy(search_tbl, tbl, sz);
1302
aade00ce
GC		 1303 if (rs_toggle_antenna(valid_tx_ant,
1304 &search_tbl->current_rate, search_tbl)) {
aade00ce
GC		 1305 lq_sta->search_better_tbl = 1;
1306 goto out;
1307 }
a5e8b505 1308 break;
b481de9c 1309 case IWL_LEGACY_SWITCH_SISO:
eecd6e57 1310 IWL_DEBUG_RATE("LQ: Legacy switch to SISO\n");
77626355
BC		 1311
1312 /* Set up search table to try SISO */
b481de9c 1313 memcpy(search_tbl, tbl, sz);
b481de9c 1314 search_tbl->is_SGI = 0;
c33104f0 1315 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
270243a5 1316 search_tbl, index);
dc2453ae 1317 if (!ret) {
c33104f0
TW		 1318 lq_sta->search_better_tbl = 1;
1319 lq_sta->action_counter = 0;
b481de9c 1320 goto out;
dc2453ae 1321 }
b481de9c
ZY		 1322
1323 break;
fde0db31 1324 case IWL_LEGACY_SWITCH_MIMO2:
eecd6e57 1325 IWL_DEBUG_RATE("LQ: Legacy switch to MIMO2\n");
77626355
BC		 1326
1327 /* Set up search table to try MIMO */
b481de9c 1328 memcpy(search_tbl, tbl, sz);
b481de9c 1329 search_tbl->is_SGI = 0;
fde0db31
GC		 1330 search_tbl->ant_type = ANT_AB;/*FIXME:RS*/
1331 /*FIXME:RS:need to check ant validity*/
1332 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
270243a5 1333 search_tbl, index);
dc2453ae 1334 if (!ret) {
c33104f0
TW		 1335 lq_sta->search_better_tbl = 1;
1336 lq_sta->action_counter = 0;
b481de9c 1337 goto out;
dc2453ae 1338 }
b481de9c
ZY		 1339 break;
1340 }
1341 tbl->action++;
fde0db31 1342 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2)
b481de9c
ZY		 1343 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1344
1345 if (tbl->action == start_action)
1346 break;
1347
1348 }
1349 return 0;
1350
1351 out:
1352 tbl->action++;
fde0db31 1353 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2)
b481de9c
ZY		 1354 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1355 return 0;
1356
1357}
1358
77626355
BC		 1359/*
1360 * Try to switch to new modulation mode from SISO
1361 */
c79dd5b5 1362static int rs_move_siso_to_other(struct iwl_priv *priv,
c33104f0 1363 struct iwl4965_lq_sta *lq_sta,
270243a5
RR		 1364 struct ieee80211_conf *conf,
1365 struct sta_info *sta,
b481de9c
ZY		 1366 int index)
1367{
c33104f0 1368 u8 is_green = lq_sta->is_green;
bb8c093b 1369 struct iwl4965_scale_tbl_info *tbl =
c33104f0 1370 &(lq_sta->lq_info[lq_sta->active_tbl]);
bb8c093b 1371 struct iwl4965_scale_tbl_info *search_tbl =
c33104f0 1372 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
bb8c093b
CH		 1373 struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1374 u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1375 (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
b481de9c 1376 u8 start_action = tbl->action;
fde0db31
GC		 1377 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1378 int ret;
b481de9c
ZY		 1379
1380 for (;;) {
c33104f0 1381 lq_sta->action_counter++;
b481de9c
ZY		 1382 switch (tbl->action) {
1383 case IWL_SISO_SWITCH_ANTENNA:
eecd6e57 1384 IWL_DEBUG_RATE("LQ: SISO toggle Antenna\n");
b481de9c
ZY		 1385 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1386 break;
b481de9c
ZY		 1387
1388 memcpy(search_tbl, tbl, sz);
aade00ce
GC		 1389 if (rs_toggle_antenna(valid_tx_ant,
1390 &search_tbl->current_rate, search_tbl)) {
1391 lq_sta->search_better_tbl = 1;
1392 goto out;
1393 }
a5e8b505 1394 break;
fde0db31 1395 case IWL_SISO_SWITCH_MIMO2:
a5e8b505 1396 IWL_DEBUG_RATE("LQ: SISO switch to MIMO2\n");
b481de9c 1397 memcpy(search_tbl, tbl, sz);
b481de9c 1398 search_tbl->is_SGI = 0;
fde0db31
GC		 1399 search_tbl->ant_type = ANT_AB; /*FIXME:RS*/
1400 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
270243a5 1401 search_tbl, index);
dc2453ae 1402 if (!ret) {
c33104f0 1403 lq_sta->search_better_tbl = 1;
b481de9c 1404 goto out;
dc2453ae 1405 }
b481de9c
ZY		 1406 break;
1407 case IWL_SISO_SWITCH_GI:
a9841013
EG		 1408 if (!tbl->is_fat &&
1409 !(priv->current_ht_config.sgf &
1410 HT_SHORT_GI_20MHZ))
1411 break;
1412 if (tbl->is_fat &&
1413 !(priv->current_ht_config.sgf &
1414 HT_SHORT_GI_40MHZ))
1415 break;
1416
eecd6e57 1417 IWL_DEBUG_RATE("LQ: SISO toggle SGI/NGI\n");
0c11b4de 1418
b481de9c 1419 memcpy(search_tbl, tbl, sz);
39e88504
GC		 1420 if (is_green) {
1421 if (!tbl->is_SGI)
1422 break;
1423 else
1424 IWL_ERROR("SGI was set in GF+SISO\n");
b481de9c 1425 }
39e88504 1426 search_tbl->is_SGI = !tbl->is_SGI;
eecd6e57 1427 rs_set_expected_tpt_table(lq_sta, search_tbl);
39e88504
GC		 1428 if (tbl->is_SGI) {
1429 s32 tpt = lq_sta->last_tpt / 100;
1430 if (tpt >= search_tbl->expected_tpt[index])
1431 break;
1432 }
1433 search_tbl->current_rate = rate_n_flags_from_tbl(
1434 search_tbl, index, is_green);
1435 lq_sta->search_better_tbl = 1;
b481de9c
ZY		 1436 goto out;
1437 }
1438 tbl->action++;
1439 if (tbl->action > IWL_SISO_SWITCH_GI)
1440 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1441
1442 if (tbl->action == start_action)
1443 break;
1444 }
1445 return 0;
1446
1447 out:
1448 tbl->action++;
1449 if (tbl->action > IWL_SISO_SWITCH_GI)
1450 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1451 return 0;
1452}
1453
77626355
BC		 1454/*
1455 * Try to switch to new modulation mode from MIMO
1456 */
c79dd5b5 1457static int rs_move_mimo_to_other(struct iwl_priv *priv,
c33104f0 1458 struct iwl4965_lq_sta *lq_sta,
270243a5
RR		 1459 struct ieee80211_conf *conf,
1460 struct sta_info *sta,
b481de9c
ZY		 1461 int index)
1462{
c33104f0 1463 s8 is_green = lq_sta->is_green;
bb8c093b 1464 struct iwl4965_scale_tbl_info *tbl =
c33104f0 1465 &(lq_sta->lq_info[lq_sta->active_tbl]);
bb8c093b 1466 struct iwl4965_scale_tbl_info *search_tbl =
c33104f0 1467 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
bb8c093b
CH		 1468 u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1469 (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
b481de9c 1470 u8 start_action = tbl->action;
aade00ce
GC		 1471 /*u8 valid_tx_ant = priv->hw_params.valid_tx_ant;*/
1472 int ret;
b481de9c
ZY		 1473
1474 for (;;) {
c33104f0 1475 lq_sta->action_counter++;
b481de9c
ZY		 1476 switch (tbl->action) {
1477 case IWL_MIMO_SWITCH_ANTENNA_A:
1478 case IWL_MIMO_SWITCH_ANTENNA_B:
eecd6e57 1479 IWL_DEBUG_RATE("LQ: MIMO2 switch to SISO\n");
0c11b4de 1480
77626355 1481 /* Set up new search table for SISO */
b481de9c 1482 memcpy(search_tbl, tbl, sz);
39e88504
GC		 1483
1484 /*FIXME:RS:need to check ant validity + C*/
b481de9c 1485 if (tbl->action == IWL_MIMO_SWITCH_ANTENNA_A)
fde0db31 1486 search_tbl->ant_type = ANT_A;
b481de9c 1487 else
fde0db31 1488 search_tbl->ant_type = ANT_B;
b481de9c 1489
c33104f0 1490 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
270243a5 1491 search_tbl, index);
dc2453ae 1492 if (!ret) {
c33104f0 1493 lq_sta->search_better_tbl = 1;
b481de9c
ZY		 1494 goto out;
1495 }
1496 break;
1497
1498 case IWL_MIMO_SWITCH_GI:
a9841013
EG		 1499 if (!tbl->is_fat &&
1500 !(priv->current_ht_config.sgf &
1501 HT_SHORT_GI_20MHZ))
1502 break;
1503 if (tbl->is_fat &&
1504 !(priv->current_ht_config.sgf &
1505 HT_SHORT_GI_40MHZ))
1506 break;
1507
eecd6e57 1508 IWL_DEBUG_RATE("LQ: MIMO toggle SGI/NGI\n");
77626355
BC		 1509
1510 /* Set up new search table for MIMO */
b481de9c 1511 memcpy(search_tbl, tbl, sz);
39e88504 1512 search_tbl->is_SGI = !tbl->is_SGI;
eecd6e57 1513 rs_set_expected_tpt_table(lq_sta, search_tbl);
77626355
BC		 1514 /*
1515 * If active table already uses the fastest possible
1516 * modulation (dual stream with short guard interval),
1517 * and it's working well, there's no need to look
1518 * for a better type of modulation!
1519 */
39e88504 1520 if (tbl->is_SGI) {
c33104f0 1521 s32 tpt = lq_sta->last_tpt / 100;
39e88504
GC		 1522 if (tpt >= search_tbl->expected_tpt[index])
1523 break;
b481de9c 1524 }
39e88504
GC		 1525 search_tbl->current_rate = rate_n_flags_from_tbl(
1526 search_tbl, index, is_green);
1527 lq_sta->search_better_tbl = 1;
b481de9c
ZY		 1528 goto out;
1529
1530 }
1531 tbl->action++;
1532 if (tbl->action > IWL_MIMO_SWITCH_GI)
1533 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1534
1535 if (tbl->action == start_action)
1536 break;
1537 }
1538
1539 return 0;
1540 out:
1541 tbl->action++;
1542 if (tbl->action > IWL_MIMO_SWITCH_GI)
1543 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1544 return 0;
1545
1546}
1547
77626355
BC		 1548/*
1549 * Check whether we should continue using same modulation mode, or
1550 * begin search for a new mode, based on:
1551 * 1) # tx successes or failures while using this mode
1552 * 2) # times calling this function
1553 * 3) elapsed time in this mode (not used, for now)
1554 */
c33104f0 1555static void rs_stay_in_table(struct iwl4965_lq_sta *lq_sta)
b481de9c 1556{
bb8c093b 1557 struct iwl4965_scale_tbl_info *tbl;
b481de9c
ZY		 1558 int i;
1559 int active_tbl;
1560 int flush_interval_passed = 0;
bf403db8 1561 struct iwl_priv *priv;
b481de9c 1562
bf403db8 1563 priv = lq_sta->drv;
c33104f0 1564 active_tbl = lq_sta->active_tbl;
b481de9c 1565
c33104f0 1566 tbl = &(lq_sta->lq_info[active_tbl]);
b481de9c 1567
77626355 1568 /* If we've been disallowing search, see if we should now allow it */
c33104f0 1569 if (lq_sta->stay_in_tbl) {
b481de9c 1570
77626355 1571 /* Elapsed time using current modulation mode */
c33104f0 1572 if (lq_sta->flush_timer)
b481de9c
ZY		 1573 flush_interval_passed =
1574 time_after(jiffies,
c33104f0 1575 (unsigned long)(lq_sta->flush_timer +
b481de9c
ZY		 1576 IWL_RATE_SCALE_FLUSH_INTVL));
1577
77626355
BC		 1578 /*
1579 * Check if we should allow search for new modulation mode.
1580 * If many frames have failed or succeeded, or we've used
1581 * this same modulation for a long time, allow search, and
1582 * reset history stats that keep track of whether we should
1583 * allow a new search. Also (below) reset all bitmaps and
1584 * stats in active history.
1585 */
c33104f0
TW		 1586 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1587 (lq_sta->total_success > lq_sta->max_success_limit) ||
1588 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
b481de9c 1589 && (flush_interval_passed))) {
eecd6e57 1590 IWL_DEBUG_RATE("LQ: stay is expired %d %d %d\n:",
c33104f0
TW		 1591 lq_sta->total_failed,
1592 lq_sta->total_success,
b481de9c 1593 flush_interval_passed);
77626355
BC		 1594
1595 /* Allow search for new mode */
c33104f0
TW		 1596 lq_sta->stay_in_tbl = 0; /* only place reset */
1597 lq_sta->total_failed = 0;
1598 lq_sta->total_success = 0;
1599 lq_sta->flush_timer = 0;
77626355
BC		 1600
1601 /*
1602 * Else if we've used this modulation mode enough repetitions
1603 * (regardless of elapsed time or success/failure), reset
1604 * history bitmaps and rate-specific stats for all rates in
1605 * active table.
1606 */
403ab56b 1607 } else {
c33104f0
TW		 1608 lq_sta->table_count++;
1609 if (lq_sta->table_count >=
1610 lq_sta->table_count_limit) {
1611 lq_sta->table_count = 0;
b481de9c 1612
eecd6e57 1613 IWL_DEBUG_RATE("LQ: stay in table clear win\n");
b481de9c
ZY		 1614 for (i = 0; i < IWL_RATE_COUNT; i++)
1615 rs_rate_scale_clear_window(
1616 &(tbl->win[i]));
1617 }
1618 }
1619
77626355
BC		 1620 /* If transitioning to allow "search", reset all history
1621 * bitmaps and stats in active table (this will become the new
1622 * "search" table). */
c33104f0 1623 if (!lq_sta->stay_in_tbl) {
b481de9c
ZY		 1624 for (i = 0; i < IWL_RATE_COUNT; i++)
1625 rs_rate_scale_clear_window(&(tbl->win[i]));
1626 }
1627 }
1628}
1629
77626355
BC		 1630/*
1631 * Do rate scaling and search for new modulation mode.
1632 */
c79dd5b5 1633static void rs_rate_scale_perform(struct iwl_priv *priv,
b481de9c
ZY		 1634 struct net_device *dev,
1635 struct ieee80211_hdr *hdr,
1636 struct sta_info *sta)
1637{
270243a5
RR		 1638 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1639 struct ieee80211_hw *hw = local_to_hw(local);
1640 struct ieee80211_conf *conf = &hw->conf;
b481de9c
ZY		 1641 int low = IWL_RATE_INVALID;
1642 int high = IWL_RATE_INVALID;
1643 int index;
1644 int i;
bb8c093b 1645 struct iwl4965_rate_scale_data *window = NULL;
b481de9c
ZY		 1646 int current_tpt = IWL_INVALID_VALUE;
1647 int low_tpt = IWL_INVALID_VALUE;
1648 int high_tpt = IWL_INVALID_VALUE;
1649 u32 fail_count;
1650 s8 scale_action = 0;
1651 u16 fc, rate_mask;
1652 u8 update_lq = 0;
c33104f0 1653 struct iwl4965_lq_sta *lq_sta;
bb8c093b 1654 struct iwl4965_scale_tbl_info *tbl, *tbl1;
b481de9c 1655 u16 rate_scale_index_msk = 0;
39e88504 1656 u32 rate;
b481de9c
ZY		 1657 u8 is_green = 0;
1658 u8 active_tbl = 0;
1659 u8 done_search = 0;
1660 u16 high_low;
a5e8b505 1661 s32 sr;
0c11b4de 1662 u8 tid = MAX_TID_COUNT;
b481de9c
ZY		 1663
1664 IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1665
1666 fc = le16_to_cpu(hdr->frame_control);
1667 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
1668 /* Send management frames and broadcast/multicast data using
1669 * lowest rate. */
1670 /* TODO: this could probably be improved.. */
1671 return;
1672 }
1673
1674 if (!sta || !sta->rate_ctrl_priv)
1675 return;
1676
1677 if (!priv->lq_mngr.lq_ready) {
1678 IWL_DEBUG_RATE("still rate scaling not ready\n");
1679 return;
1680 }
c33104f0 1681 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
b481de9c 1682
54dbb525 1683 rs_tl_add_packet(lq_sta, hdr);
77626355
BC		 1684 /*
1685 * Select rate-scale / modulation-mode table to work with in
1686 * the rest of this function: "search" if searching for better
1687 * modulation mode, or "active" if doing rate scaling within a mode.
1688 */
c33104f0
TW		 1689 if (!lq_sta->search_better_tbl)
1690 active_tbl = lq_sta->active_tbl;
b481de9c 1691 else
c33104f0 1692 active_tbl = 1 - lq_sta->active_tbl;
b481de9c 1693
c33104f0
TW		 1694 tbl = &(lq_sta->lq_info[active_tbl]);
1695 is_green = lq_sta->is_green;
b481de9c 1696
77626355 1697 /* current tx rate */
8318d78a 1698 index = sta->last_txrate_idx;
b481de9c
ZY		 1699
1700 IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1701 tbl->lq_type);
1702
77626355 1703 /* rates available for this association, and for modulation mode */
eecd6e57 1704 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
b481de9c
ZY		 1705
1706 IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1707
1708 /* mask with station rate restriction */
1709 if (is_legacy(tbl->lq_type)) {
8318d78a 1710 if (lq_sta->band == IEEE80211_BAND_5GHZ)
77626355 1711 /* supp_rates has no CCK bits in A mode */
b481de9c 1712 rate_scale_index_msk = (u16) (rate_mask &
c33104f0 1713 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
b481de9c
ZY		 1714 else
1715 rate_scale_index_msk = (u16) (rate_mask &
c33104f0 1716 lq_sta->supp_rates);
b481de9c
ZY		 1717
1718 } else
1719 rate_scale_index_msk = rate_mask;
1720
1721 if (!rate_scale_index_msk)
1722 rate_scale_index_msk = rate_mask;
1723
07bc28ed
GC		 1724 if (!((1 << index) & rate_scale_index_msk)) {
1725 IWL_ERROR("Current Rate is not valid\n");
1726 return;
b481de9c
ZY		 1727 }
1728
77626355 1729 /* Get expected throughput table and history window for current rate */
07bc28ed
GC		 1730 if (!tbl->expected_tpt) {
1731 IWL_ERROR("tbl->expected_tpt is NULL\n");
1732 return;
1733 }
b481de9c
ZY		 1734
1735 window = &(tbl->win[index]);
1736
77626355
BC		 1737 /*
1738 * If there is not enough history to calculate actual average
1739 * throughput, keep analyzing results of more tx frames, without
1740 * changing rate or mode (bypass most of the rest of this function).
1741 * Set up new rate table in uCode only if old rate is not supported
1742 * in current association (use new rate found above).
1743 */
b481de9c 1744 fail_count = window->counter - window->success_counter;
07bc28ed
GC		 1745 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1746 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
1747 IWL_DEBUG_RATE("LQ: still below TH. succ=%d total=%d "
b481de9c
ZY		 1748 "for index %d\n",
1749 window->success_counter, window->counter, index);
77626355
BC		 1750
1751 /* Can't calculate this yet; not enough history */
b481de9c 1752 window->average_tpt = IWL_INVALID_VALUE;
77626355
BC		 1753
1754 /* Should we stay with this modulation mode,
1755 * or search for a new one? */
c33104f0 1756 rs_stay_in_table(lq_sta);
77626355 1757
b481de9c
ZY		 1758 goto out;
1759
77626355
BC		 1760 /* Else we have enough samples; calculate estimate of
1761 * actual average throughput */
07bc28ed
GC		 1762 } else {
1763 /*FIXME:RS remove this else if we don't get this error*/
1764 if (window->average_tpt != ((window->success_ratio *
1765 tbl->expected_tpt[index] + 64) / 128)) {
1766 IWL_ERROR("expected_tpt should have been calculated"
1767 " by now\n");
1768 window->average_tpt = ((window->success_ratio *
b481de9c 1769 tbl->expected_tpt[index] + 64) / 128);
07bc28ed
GC		 1770 }
1771 }
b481de9c 1772
77626355 1773 /* If we are searching for better modulation mode, check success. */
c33104f0 1774 if (lq_sta->search_better_tbl) {
b481de9c 1775
77626355
BC		 1776 /* If good success, continue using the "search" mode;
1777 * no need to send new link quality command, since we're
1778 * continuing to use the setup that we've been trying. */
07bc28ed
GC		 1779 if (window->average_tpt > lq_sta->last_tpt) {
1780
1781 IWL_DEBUG_RATE("LQ: SWITCHING TO CURRENT TABLE "
1782 "suc=%d cur-tpt=%d old-tpt=%d\n",
1783 window->success_ratio,
1784 window->average_tpt,
1785 lq_sta->last_tpt);
1786
1787 if (!is_legacy(tbl->lq_type))
c33104f0 1788 lq_sta->enable_counter = 1;
07bc28ed 1789
77626355 1790 /* Swap tables; "search" becomes "active" */
c33104f0 1791 lq_sta->active_tbl = active_tbl;
b481de9c 1792 current_tpt = window->average_tpt;
77626355
BC		 1793
1794 /* Else poor success; go back to mode in "active" table */
b481de9c 1795 } else {
07bc28ed
GC		 1796
1797 IWL_DEBUG_RATE("LQ: GOING BACK TO THE OLD TABLE "
1798 "suc=%d cur-tpt=%d old-tpt=%d\n",
1799 window->success_ratio,
1800 window->average_tpt,
1801 lq_sta->last_tpt);
1802
77626355 1803 /* Nullify "search" table */
b481de9c 1804 tbl->lq_type = LQ_NONE;
77626355
BC		 1805
1806 /* Revert to "active" table */
c33104f0
TW		 1807 active_tbl = lq_sta->active_tbl;
1808 tbl = &(lq_sta->lq_info[active_tbl]);
b481de9c 1809
77626355 1810 /* Revert to "active" rate and throughput info */
17744ff6 1811 index = iwl4965_hwrate_to_plcp_idx(
39e88504 1812 tbl->current_rate);
c33104f0 1813 current_tpt = lq_sta->last_tpt;
b481de9c 1814
77626355 1815 /* Need to set up a new rate table in uCode */
b481de9c 1816 update_lq = 1;
b481de9c 1817 }
77626355
BC		 1818
1819 /* Either way, we've made a decision; modulation mode
1820 * search is done, allow rate adjustment next time. */
c33104f0 1821 lq_sta->search_better_tbl = 0;
77626355 1822 done_search = 1; /* Don't switch modes below! */
b481de9c
ZY		 1823 goto lq_update;
1824 }
1825
77626355
BC		 1826 /* (Else) not in search of better modulation mode, try for better
1827 * starting rate, while staying in this mode. */
bf403db8 1828 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
b481de9c
ZY		 1829 tbl->lq_type);
1830 low = high_low & 0xff;
1831 high = (high_low >> 8) & 0xff;
1832
a5e8b505
GC		 1833 sr = window->success_ratio;
1834
77626355 1835 /* Collect measured throughputs for current and adjacent rates */
b481de9c 1836 current_tpt = window->average_tpt;
b481de9c
ZY		 1837 if (low != IWL_RATE_INVALID)
1838 low_tpt = tbl->win[low].average_tpt;
b481de9c
ZY		 1839 if (high != IWL_RATE_INVALID)
1840 high_tpt = tbl->win[high].average_tpt;
1841
a5e8b505 1842 scale_action = 0;
b481de9c 1843
77626355 1844 /* Too many failures, decrease rate */
a5e8b505 1845 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
b481de9c
ZY		 1846 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1847 scale_action = -1;
77626355
BC		 1848
1849 /* No throughput measured yet for adjacent rates; try increase. */
b481de9c 1850 } else if ((low_tpt == IWL_INVALID_VALUE) &&
a5e8b505
GC		 1851 (high_tpt == IWL_INVALID_VALUE)) {
1852
1853 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
1854 scale_action = 1;
1855 else if (low != IWL_RATE_INVALID)
1856 scale_action = -1;
1857 }
77626355
BC		 1858
1859 /* Both adjacent throughputs are measured, but neither one has better
1860 * throughput; we're using the best rate, don't change it! */
b481de9c
ZY		 1861 else if ((low_tpt != IWL_INVALID_VALUE) &&
1862 (high_tpt != IWL_INVALID_VALUE) &&
1863 (low_tpt < current_tpt) &&
1864 (high_tpt < current_tpt))
1865 scale_action = 0;
77626355
BC		 1866
1867 /* At least one adjacent rate's throughput is measured,
1868 * and may have better performance. */
b481de9c 1869 else {
77626355 1870 /* Higher adjacent rate's throughput is measured */
b481de9c 1871 if (high_tpt != IWL_INVALID_VALUE) {
77626355 1872 /* Higher rate has better throughput */
a5e8b505
GC		 1873 if (high_tpt > current_tpt &&
1874 sr >= IWL_RATE_INCREASE_TH) {
b481de9c 1875 scale_action = 1;
a5e8b505 1876 } else {
b481de9c
ZY		 1877 IWL_DEBUG_RATE
1878 ("decrease rate because of high tpt\n");
1879 scale_action = -1;
1880 }
77626355
BC		 1881
1882 /* Lower adjacent rate's throughput is measured */
b481de9c 1883 } else if (low_tpt != IWL_INVALID_VALUE) {
77626355 1884 /* Lower rate has better throughput */
b481de9c
ZY		 1885 if (low_tpt > current_tpt) {
1886 IWL_DEBUG_RATE
1887 ("decrease rate because of low tpt\n");
1888 scale_action = -1;
a5e8b505 1889 } else if (sr >= IWL_RATE_INCREASE_TH) {
b481de9c 1890 scale_action = 1;
a5e8b505 1891 }
b481de9c
ZY		 1892 }
1893 }
1894
77626355
BC		 1895 /* Sanity check; asked for decrease, but success rate or throughput
1896 * has been good at old rate. Don't change it. */
a5e8b505
GC		 1897 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
1898 ((sr > IWL_RATE_HIGH_TH) ||
b481de9c 1899 (current_tpt > (100 * tbl->expected_tpt[low]))))
b481de9c
ZY		 1900 scale_action = 0;
1901
1902 switch (scale_action) {
1903 case -1:
77626355 1904 /* Decrease starting rate, update uCode's rate table */
b481de9c
ZY		 1905 if (low != IWL_RATE_INVALID) {
1906 update_lq = 1;
1907 index = low;
1908 }
1909 break;
1910 case 1:
77626355 1911 /* Increase starting rate, update uCode's rate table */
b481de9c
ZY		 1912 if (high != IWL_RATE_INVALID) {
1913 update_lq = 1;
1914 index = high;
1915 }
1916
1917 break;
1918 case 0:
77626355 1919 /* No change */
b481de9c
ZY		 1920 default:
1921 break;
1922 }
1923
eecd6e57 1924 IWL_DEBUG_RATE("choose rate scale index %d action %d low %d "
b481de9c
ZY		 1925 "high %d type %d\n",
1926 index, scale_action, low, high, tbl->lq_type);
1927
a5e8b505 1928lq_update:
77626355 1929 /* Replace uCode's rate table for the destination station. */
b481de9c 1930 if (update_lq) {
39e88504 1931 rate = rate_n_flags_from_tbl(tbl, index, is_green);
07bc28ed 1932 rs_fill_link_cmd(priv, lq_sta, rate);
66c73db7 1933 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
b481de9c 1934 }
77626355
BC		 1935
1936 /* Should we stay with this modulation mode, or search for a new one? */
c33104f0 1937 rs_stay_in_table(lq_sta);
b481de9c 1938
77626355
BC		 1939 /*
1940 * Search for new modulation mode if we're:
1941 * 1) Not changing rates right now
1942 * 2) Not just finishing up a search
1943 * 3) Allowing a new search
1944 */
47cfd463 1945 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
77626355 1946 /* Save current throughput to compare with "search" throughput*/
c33104f0 1947 lq_sta->last_tpt = current_tpt;
b481de9c 1948
77626355
BC		 1949 /* Select a new "search" modulation mode to try.
1950 * If one is found, set up the new "search" table. */
b481de9c 1951 if (is_legacy(tbl->lq_type))
c33104f0 1952 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
b481de9c 1953 else if (is_siso(tbl->lq_type))
c33104f0 1954 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
b481de9c 1955 else
c33104f0 1956 rs_move_mimo_to_other(priv, lq_sta, conf, sta, index);
b481de9c 1957
77626355 1958 /* If new "search" mode was selected, set up in uCode table */
c33104f0 1959 if (lq_sta->search_better_tbl) {
77626355 1960 /* Access the "search" table, clear its history. */
c33104f0 1961 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
b481de9c
ZY		 1962 for (i = 0; i < IWL_RATE_COUNT; i++)
1963 rs_rate_scale_clear_window(&(tbl->win[i]));
1964
77626355 1965 /* Use new "search" start rate */
17744ff6 1966 index = iwl4965_hwrate_to_plcp_idx(
39e88504 1967 tbl->current_rate);
b481de9c 1968
eecd6e57 1969 IWL_DEBUG_RATE("Switch current mcs: %X index: %d\n",
39e88504 1970 tbl->current_rate, index);
07bc28ed 1971 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
66c73db7 1972 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
b481de9c 1973 }
b481de9c 1974
77626355
BC		 1975 /* If the "active" (non-search) mode was legacy,
1976 * and we've tried switching antennas,
1977 * but we haven't been able to try HT modes (not available),
1978 * stay with best antenna legacy modulation for a while
1979 * before next round of mode comparisons. */
c33104f0 1980 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
b481de9c 1981 if (is_legacy(tbl1->lq_type) &&
270243a5 1982 (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)) &&
c33104f0
TW		 1983 (lq_sta->action_counter >= 1)) {
1984 lq_sta->action_counter = 0;
eecd6e57 1985 IWL_DEBUG_RATE("LQ: STAY in legacy table\n");
bf403db8 1986 rs_set_stay_in_table(priv, 1, lq_sta);
b481de9c
ZY		 1987 }
1988
77626355
BC		 1989 /* If we're in an HT mode, and all 3 mode switch actions
1990 * have been tried and compared, stay in this best modulation
1991 * mode for a while before next round of mode comparisons. */
c33104f0
TW		 1992 if (lq_sta->enable_counter &&
1993 (lq_sta->action_counter >= IWL_ACTION_LIMIT)) {
0c11b4de
RR		 1994 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
1995 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
1996 (tid != MAX_TID_COUNT)) {
eecd6e57 1997 IWL_DEBUG_RATE("try to aggregate tid %d\n", tid);
0c11b4de 1998 rs_tl_turn_on_agg(priv, tid, lq_sta, sta);
b481de9c 1999 }
c33104f0 2000 lq_sta->action_counter = 0;
bf403db8 2001 rs_set_stay_in_table(priv, 0, lq_sta);
b481de9c 2002 }
77626355
BC		 2003
2004 /*
2005 * Else, don't search for a new modulation mode.
2006 * Put new timestamp in stay-in-modulation-mode flush timer if:
2007 * 1) Not changing rates right now
2008 * 2) Not just finishing up a search
2009 * 3) flush timer is empty
2010 */
b481de9c 2011 } else {
c33104f0
TW		 2012 if ((!update_lq) && (!done_search) && (!lq_sta->flush_timer))
2013 lq_sta->flush_timer = jiffies;
b481de9c
ZY		 2014 }
2015
2016out:
39e88504 2017 tbl->current_rate = rate_n_flags_from_tbl(tbl, index, is_green);
b481de9c 2018 i = index;
8318d78a 2019 sta->last_txrate_idx = i;
b481de9c 2020
8318d78a 2021 /* sta->txrate_idx is an index to A mode rates which start
b481de9c
ZY		 2022 * at IWL_FIRST_OFDM_RATE
2023 */
8318d78a
JB		 2024 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2025 sta->txrate_idx = i - IWL_FIRST_OFDM_RATE;
b481de9c 2026 else
8318d78a 2027 sta->txrate_idx = i;
b481de9c
ZY		 2028
2029 return;
2030}
2031
2032
c79dd5b5 2033static void rs_initialize_lq(struct iwl_priv *priv,
270243a5 2034 struct ieee80211_conf *conf,
b481de9c
ZY		 2035 struct sta_info *sta)
2036{
c33104f0 2037 struct iwl4965_lq_sta *lq_sta;
bb8c093b 2038 struct iwl4965_scale_tbl_info *tbl;
b481de9c 2039 int rate_idx;
aade00ce 2040 int i;
39e88504 2041 u32 rate;
aade00ce
GC		 2042 u8 use_green = rs_use_green(priv, conf);
2043 u8 active_tbl = 0;
2044 u8 valid_tx_ant;
b481de9c
ZY		 2045
2046 if (!sta || !sta->rate_ctrl_priv)
2047 goto out;
2048
c33104f0 2049 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
8318d78a 2050 i = sta->last_txrate_idx;
b481de9c 2051
c33104f0 2052 if ((lq_sta->lq.sta_id == 0xff) &&
b481de9c
ZY		 2053 (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
2054 goto out;
2055
aade00ce
GC		 2056 valid_tx_ant = priv->hw_params.valid_tx_ant;
2057
c33104f0
TW		 2058 if (!lq_sta->search_better_tbl)
2059 active_tbl = lq_sta->active_tbl;
b481de9c 2060 else
c33104f0 2061 active_tbl = 1 - lq_sta->active_tbl;
b481de9c 2062
c33104f0 2063 tbl = &(lq_sta->lq_info[active_tbl]);
b481de9c
ZY		 2064
2065 if ((i < 0) || (i >= IWL_RATE_COUNT))
2066 i = 0;
2067
fde0db31 2068 /* FIXME:RS: This is also wrong in 4965 */
1826dcc0 2069 rate = iwl_rates[i].plcp;
39e88504
GC		 2070 rate |= RATE_MCS_ANT_B_MSK;
2071 rate &= ~RATE_MCS_ANT_A_MSK;
b481de9c
ZY		 2072
2073 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
39e88504 2074 rate |= RATE_MCS_CCK_MSK;
b481de9c 2075
fde0db31 2076 tbl->ant_type = ANT_B;
39e88504 2077 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
aade00ce
GC		 2078 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2079 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
b481de9c 2080
39e88504
GC		 2081 rate = rate_n_flags_from_tbl(tbl, rate_idx, use_green);
2082 tbl->current_rate = rate;
eecd6e57 2083 rs_set_expected_tpt_table(lq_sta, tbl);
07bc28ed 2084 rs_fill_link_cmd(NULL, lq_sta, rate);
66c73db7 2085 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
b481de9c
ZY		 2086 out:
2087 return;
2088}
2089
1abbe498 2090static void rs_get_rate(void *priv_rate, struct net_device *dev,
8318d78a
JB		 2091 struct ieee80211_supported_band *sband,
2092 struct sk_buff *skb,
1abbe498 2093 struct rate_selection *sel)
b481de9c
ZY		 2094{
2095
2096 int i;
2097 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
270243a5 2098 struct ieee80211_conf *conf = &local->hw.conf;
b481de9c
ZY		 2099 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2100 struct sta_info *sta;
2bc454b0 2101 u16 fc;
c79dd5b5 2102 struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
c33104f0 2103 struct iwl4965_lq_sta *lq_sta;
b481de9c 2104
58826351 2105 IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
b481de9c 2106
d0709a65
JB		 2107 rcu_read_lock();
2108
b481de9c
ZY		 2109 sta = sta_info_get(local, hdr->addr1);
2110
2bc454b0
MW		 2111 /* Send management frames and broadcast/multicast data using lowest
2112 * rate. */
2113 fc = le16_to_cpu(hdr->frame_control);
2114 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1) ||
2115 !sta || !sta->rate_ctrl_priv) {
2e92e6f2 2116 sel->rate_idx = rate_lowest_index(local, sband, sta);
f4d6082d 2117 goto out;
b481de9c
ZY		 2118 }
2119
c33104f0 2120 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
8318d78a 2121 i = sta->last_txrate_idx;
b481de9c 2122
c33104f0
TW		 2123 if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
2124 !lq_sta->ibss_sta_added) {
947b13a7 2125 u8 sta_id = iwl_find_station(priv, hdr->addr1);
0795af57 2126 DECLARE_MAC_BUF(mac);
b481de9c
ZY		 2127
2128 if (sta_id == IWL_INVALID_STATION) {
0795af57
JP		 2129 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2130 print_mac(mac, hdr->addr1));
4f40e4d9 2131 sta_id = iwl_add_station_flags(priv, hdr->addr1,
67d62035 2132 0, CMD_ASYNC, NULL);
b481de9c
ZY		 2133 }
2134 if ((sta_id != IWL_INVALID_STATION)) {
c33104f0
TW		 2135 lq_sta->lq.sta_id = sta_id;
2136 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2137 lq_sta->ibss_sta_added = 1;
270243a5 2138 rs_initialize_lq(priv, conf, sta);
b481de9c 2139 }
c33104f0 2140 if (!lq_sta->ibss_sta_added)
b481de9c
ZY		 2141 goto done;
2142 }
2143
f4d6082d 2144done:
1abbe498 2145 if ((i < 0) || (i > IWL_RATE_COUNT)) {
2e92e6f2 2146 sel->rate_idx = rate_lowest_index(local, sband, sta);
f4d6082d 2147 goto out;
1abbe498 2148 }
b481de9c 2149
2e92e6f2
JB		 2150 if (sband->band == IEEE80211_BAND_5GHZ)
2151 i -= IWL_FIRST_OFDM_RATE;
2152 sel->rate_idx = i;
f4d6082d
TW		 2153out:
2154 rcu_read_unlock();
b481de9c
ZY		 2155}
2156
bf403db8 2157static void *rs_alloc_sta(void *priv_rate, gfp_t gfp)
b481de9c 2158{
c33104f0 2159 struct iwl4965_lq_sta *lq_sta;
bf403db8 2160 struct iwl_priv *priv;
b481de9c
ZY		 2161 int i, j;
2162
bf403db8 2163 priv = (struct iwl_priv *)priv_rate;
b481de9c
ZY		 2164 IWL_DEBUG_RATE("create station rate scale window\n");
2165
c33104f0 2166 lq_sta = kzalloc(sizeof(struct iwl4965_lq_sta), gfp);
b481de9c 2167
c33104f0 2168 if (lq_sta == NULL)
b481de9c 2169 return NULL;
c33104f0 2170 lq_sta->lq.sta_id = 0xff;
b481de9c 2171
63fddb9f 2172
b481de9c
ZY		 2173 for (j = 0; j < LQ_SIZE; j++)
2174 for (i = 0; i < IWL_RATE_COUNT; i++)
c33104f0 2175 rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
b481de9c 2176
c33104f0 2177 return lq_sta;
b481de9c
ZY		 2178}
2179
2180static void rs_rate_init(void *priv_rate, void *priv_sta,
2181 struct ieee80211_local *local,
2182 struct sta_info *sta)
2183{
2184 int i, j;
270243a5 2185 struct ieee80211_conf *conf = &local->hw.conf;
8318d78a 2186 struct ieee80211_supported_band *sband;
c79dd5b5 2187 struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
c33104f0 2188 struct iwl4965_lq_sta *lq_sta = priv_sta;
b481de9c 2189
8318d78a
JB		 2190 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2191
c33104f0 2192 lq_sta->flush_timer = 0;
8318d78a
JB		 2193 lq_sta->supp_rates = sta->supp_rates[sband->band];
2194 sta->txrate_idx = 3;
b481de9c
ZY		 2195 for (j = 0; j < LQ_SIZE; j++)
2196 for (i = 0; i < IWL_RATE_COUNT; i++)
c33104f0 2197 rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
b481de9c 2198
07bc28ed 2199 IWL_DEBUG_RATE("LQ: *** rate scale global init ***\n");
b481de9c
ZY		 2200 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2201 * the lowest or the highest rate.. Could consider using RSSI from
2202 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2203 * after assoc.. */
2204
c33104f0 2205 lq_sta->ibss_sta_added = 0;
b481de9c 2206 if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
947b13a7 2207 u8 sta_id = iwl_find_station(priv, sta->addr);
0795af57
JP		 2208 DECLARE_MAC_BUF(mac);
2209
b481de9c 2210 /* for IBSS the call are from tasklet */
eecd6e57 2211 IWL_DEBUG_RATE("LQ: ADD station %s\n",
0795af57 2212 print_mac(mac, sta->addr));
b481de9c
ZY		 2213
2214 if (sta_id == IWL_INVALID_STATION) {
0795af57
JP		 2215 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2216 print_mac(mac, sta->addr));
4f40e4d9 2217 sta_id = iwl_add_station_flags(priv, sta->addr,
67d62035 2218 0, CMD_ASYNC, NULL);
b481de9c
ZY		 2219 }
2220 if ((sta_id != IWL_INVALID_STATION)) {
c33104f0
TW		 2221 lq_sta->lq.sta_id = sta_id;
2222 lq_sta->lq.rs_table[0].rate_n_flags = 0;
b481de9c
ZY		 2223 }
2224 /* FIXME: this is w/a remove it later */
2225 priv->assoc_station_added = 1;
2226 }
2227
77626355 2228 /* Find highest tx rate supported by hardware and destination station */
8318d78a
JB		 2229 for (i = 0; i < sband->n_bitrates; i++)
2230 if (sta->supp_rates[sband->band] & BIT(i))
2231 sta->txrate_idx = i;
2232
2233 sta->last_txrate_idx = sta->txrate_idx;
2234 /* WTF is with this bogus comment? A doesn't have cck rates */
77626355 2235 /* For MODE_IEEE80211A, cck rates are at end of rate table */
8318d78a
JB		 2236 if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
2237 sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
b481de9c 2238
c33104f0 2239 lq_sta->is_dup = 0;
c33104f0 2240 lq_sta->is_green = rs_use_green(priv, conf);
39e88504 2241 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
c33104f0 2242 lq_sta->active_rate_basic = priv->active_rate_basic;
8318d78a 2243 lq_sta->band = priv->band;
77626355
BC		 2244 /*
2245 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2246 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2247 */
263b5f5a
RR		 2248 lq_sta->active_siso_rate = conf->ht_conf.supp_mcs_set[0] << 1;
2249 lq_sta->active_siso_rate |= conf->ht_conf.supp_mcs_set[0] & 0x1;
c33104f0 2250 lq_sta->active_siso_rate &= ~((u16)0x2);
fde0db31 2251 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
b481de9c 2252
77626355 2253 /* Same here */
263b5f5a
RR		 2254 lq_sta->active_mimo2_rate = conf->ht_conf.supp_mcs_set[1] << 1;
2255 lq_sta->active_mimo2_rate |= conf->ht_conf.supp_mcs_set[1] & 0x1;
fde0db31
GC		 2256 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2257 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2258
263b5f5a
RR		 2259 lq_sta->active_mimo3_rate = conf->ht_conf.supp_mcs_set[2] << 1;
2260 lq_sta->active_mimo3_rate |= conf->ht_conf.supp_mcs_set[2] & 0x1;
fde0db31
GC		 2261 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2262 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2263
07bc28ed 2264 IWL_DEBUG_RATE("SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
c33104f0 2265 lq_sta->active_siso_rate,
fde0db31
GC		 2266 lq_sta->active_mimo2_rate,
2267 lq_sta->active_mimo3_rate);
2268
07bc28ed
GC		 2269 /* These values will be overriden later */
2270 lq_sta->lq.general_params.single_stream_ant_msk = ANT_A;
2271 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2272
0c11b4de
RR		 2273 /* as default allow aggregation for all tids */
2274 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
98d7e09a 2275#ifdef CONFIG_MAC80211_DEBUGFS
c33104f0 2276 lq_sta->drv = priv;
98d7e09a 2277#endif
b481de9c
ZY		 2278
2279 if (priv->assoc_station_added)
2280 priv->lq_mngr.lq_ready = 1;
2281
270243a5 2282 rs_initialize_lq(priv, conf, sta);
b481de9c
ZY		 2283}
2284
fde0db31
GC		 2285static void rs_fill_link_cmd(const struct iwl_priv *priv,
2286 struct iwl4965_lq_sta *lq_sta,
07bc28ed 2287 u32 new_rate)
b481de9c 2288{
aade00ce 2289 struct iwl4965_scale_tbl_info tbl_type;
b481de9c 2290 int index = 0;
b481de9c 2291 int rate_idx;
1b696de2 2292 int repeat_rate = 0;
aade00ce 2293 u8 ant_toggle_cnt = 0;
b481de9c 2294 u8 use_ht_possible = 1;
aade00ce 2295 u8 valid_tx_ant = 0;
07bc28ed 2296 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
b481de9c 2297
77626355 2298 /* Override starting rate (index 0) if needed for debug purposes */
39e88504 2299 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
98d7e09a 2300
39e88504 2301 /* Interpret new_rate (rate_n_flags) */
aade00ce 2302 memset(&tbl_type, 0, sizeof(tbl_type));
39e88504 2303 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
b481de9c
ZY		 2304 &tbl_type, &rate_idx);
2305
77626355 2306 /* How many times should we repeat the initial rate? */
b481de9c 2307 if (is_legacy(tbl_type.lq_type)) {
aade00ce 2308 ant_toggle_cnt = 1;
1b696de2 2309 repeat_rate = IWL_NUMBER_TRY;
aade00ce 2310 } else {
1b696de2 2311 repeat_rate = IWL_HT_NUMBER_TRY;
aade00ce 2312 }
b481de9c
ZY		 2313
2314 lq_cmd->general_params.mimo_delimiter =
2315 is_mimo(tbl_type.lq_type) ? 1 : 0;
77626355
BC		 2316
2317 /* Fill 1st table entry (index 0) */
39e88504 2318 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
b481de9c 2319
07bc28ed
GC		 2320 if (num_of_ant(tbl_type.ant_type) == 1) {
2321 lq_cmd->general_params.single_stream_ant_msk =
2322 tbl_type.ant_type;
2323 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2324 lq_cmd->general_params.dual_stream_ant_msk =
2325 tbl_type.ant_type;
2326 } /* otherwise we don't modify the existing value */
b481de9c
ZY		 2327
2328 index++;
1b696de2 2329 repeat_rate--;
b481de9c 2330
aade00ce
GC		 2331 if (priv)
2332 valid_tx_ant = priv->hw_params.valid_tx_ant;
2333
77626355 2334 /* Fill rest of rate table */
b481de9c 2335 while (index < LINK_QUAL_MAX_RETRY_NUM) {
77626355
BC		 2336 /* Repeat initial/next rate.
2337 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2338 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
1b696de2 2339 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
b481de9c 2340 if (is_legacy(tbl_type.lq_type)) {
aade00ce
GC		 2341 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2342 ant_toggle_cnt++;
2343 else if (priv &&
2344 rs_toggle_antenna(valid_tx_ant,
2345 &new_rate, &tbl_type))
2346 ant_toggle_cnt = 1;
2347}
98d7e09a 2348
77626355 2349 /* Override next rate if needed for debug purposes */
c33104f0 2350 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
77626355
BC		 2351
2352 /* Fill next table entry */
b481de9c 2353 lq_cmd->rs_table[index].rate_n_flags =
39e88504 2354 cpu_to_le32(new_rate);
1b696de2 2355 repeat_rate--;
b481de9c
ZY		 2356 index++;
2357 }
2358
39e88504 2359 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
b481de9c
ZY		 2360 &rate_idx);
2361
77626355
BC		 2362 /* Indicate to uCode which entries might be MIMO.
2363 * If initial rate was MIMO, this will finally end up
2364 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
b481de9c
ZY		 2365 if (is_mimo(tbl_type.lq_type))
2366 lq_cmd->general_params.mimo_delimiter = index;
2367
77626355 2368 /* Get next rate */
39e88504
GC		 2369 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2370 use_ht_possible);
b481de9c 2371
77626355 2372 /* How many times should we repeat the next rate? */
b481de9c 2373 if (is_legacy(tbl_type.lq_type)) {
aade00ce
GC		 2374 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2375 ant_toggle_cnt++;
2376 else if (priv &&
2377 rs_toggle_antenna(valid_tx_ant,
2378 &new_rate, &tbl_type))
2379 ant_toggle_cnt = 1;
2380
1b696de2 2381 repeat_rate = IWL_NUMBER_TRY;
aade00ce 2382 } else {
1b696de2 2383 repeat_rate = IWL_HT_NUMBER_TRY;
aade00ce 2384 }
b481de9c 2385
77626355
BC		 2386 /* Don't allow HT rates after next pass.
2387 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
b481de9c
ZY		 2388 use_ht_possible = 0;
2389
77626355 2390 /* Override next rate if needed for debug purposes */
c33104f0 2391 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
77626355
BC		 2392
2393 /* Fill next table entry */
39e88504 2394 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
b481de9c
ZY		 2395
2396 index++;
1b696de2 2397 repeat_rate--;
b481de9c
ZY		 2398 }
2399
5e1dd8dc 2400 lq_cmd->agg_params.agg_frame_cnt_limit = 64;
b481de9c
ZY		 2401 lq_cmd->agg_params.agg_dis_start_th = 3;
2402 lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
b481de9c
ZY		 2403}
2404
2405static void *rs_alloc(struct ieee80211_local *local)
2406{
2407 return local->hw.priv;
2408}
2409/* rate scale requires free function to be implemented */
2410static void rs_free(void *priv_rate)
2411{
2412 return;
2413}
2414
2415static void rs_clear(void *priv_rate)
2416{
c79dd5b5 2417 struct iwl_priv *priv = (struct iwl_priv *) priv_rate;
b481de9c
ZY		 2418
2419 IWL_DEBUG_RATE("enter\n");
2420
2421 priv->lq_mngr.lq_ready = 0;
b481de9c
ZY		 2422
2423 IWL_DEBUG_RATE("leave\n");
2424}
2425
bf403db8 2426static void rs_free_sta(void *priv_rate, void *priv_sta)
b481de9c 2427{
c33104f0 2428 struct iwl4965_lq_sta *lq_sta = priv_sta;
bf403db8 2429 struct iwl_priv *priv;
b481de9c 2430
bf403db8 2431 priv = (struct iwl_priv *)priv_rate;
b481de9c 2432 IWL_DEBUG_RATE("enter\n");
c33104f0 2433 kfree(lq_sta);
b481de9c
ZY		 2434 IWL_DEBUG_RATE("leave\n");
2435}
2436
2437
93dc646a 2438#ifdef CONFIG_MAC80211_DEBUGFS
5ae212c9
ZY		 2439static int open_file_generic(struct inode *inode, struct file *file)
2440{
2441 file->private_data = inode->i_private;
2442 return 0;
2443}
c33104f0 2444static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
39e88504 2445 u32 *rate_n_flags, int index)
98d7e09a 2446{
bf403db8
EK		 2447 struct iwl_priv *priv;
2448
2449 priv = lq_sta->drv;
39e88504
GC		 2450 if (lq_sta->dbg_fixed_rate) {
2451 if (index < 12) {
2452 *rate_n_flags = lq_sta->dbg_fixed_rate;
2453 } else {
2454 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2455 *rate_n_flags = 0x800D;
2456 else
2457 *rate_n_flags = 0x820A;
2458 }
98d7e09a 2459 IWL_DEBUG_RATE("Fixed rate ON\n");
39e88504
GC		 2460 } else {
2461 IWL_DEBUG_RATE("Fixed rate OFF\n");
98d7e09a 2462 }
98d7e09a 2463}
5ae212c9 2464
98d7e09a
ZY		 2465static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2466 const char __user *user_buf, size_t count, loff_t *ppos)
2467{
c33104f0 2468 struct iwl4965_lq_sta *lq_sta = file->private_data;
bf403db8 2469 struct iwl_priv *priv;
98d7e09a
ZY		 2470 char buf[64];
2471 int buf_size;
2472 u32 parsed_rate;
2473
bf403db8 2474 priv = lq_sta->drv;
98d7e09a
ZY		 2475 memset(buf, 0, sizeof(buf));
2476 buf_size = min(count, sizeof(buf) - 1);
2477 if (copy_from_user(buf, user_buf, buf_size))
2478 return -EFAULT;
2479
2480 if (sscanf(buf, "%x", &parsed_rate) == 1)
39e88504 2481 lq_sta->dbg_fixed_rate = parsed_rate;
98d7e09a 2482 else
39e88504 2483 lq_sta->dbg_fixed_rate = 0;
98d7e09a 2484
39e88504
GC		 2485 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2486 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2487 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2488 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
98d7e09a
ZY		 2489
2490 IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
39e88504 2491 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
98d7e09a 2492
39e88504 2493 if (lq_sta->dbg_fixed_rate) {
07bc28ed 2494 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
66c73db7 2495 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
98d7e09a
ZY		 2496 }
2497
2498 return count;
2499}
0209dc11 2500
5ae212c9
ZY		 2501static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2502 char __user *user_buf, size_t count, loff_t *ppos)
2503{
2504 char buff[1024];
2505 int desc = 0;
2506 int i = 0;
2507
c33104f0 2508 struct iwl4965_lq_sta *lq_sta = file->private_data;
5ae212c9 2509
c33104f0 2510 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
98d7e09a 2511 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
c33104f0 2512 lq_sta->total_failed, lq_sta->total_success,
39e88504 2513 lq_sta->active_legacy_rate);
98d7e09a 2514 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
39e88504 2515 lq_sta->dbg_fixed_rate);
5ae212c9
ZY		 2516 desc += sprintf(buff+desc, "general:"
2517 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
c33104f0
TW		 2518 lq_sta->lq.general_params.flags,
2519 lq_sta->lq.general_params.mimo_delimiter,
2520 lq_sta->lq.general_params.single_stream_ant_msk,
2521 lq_sta->lq.general_params.dual_stream_ant_msk);
5ae212c9
ZY		 2522
2523 desc += sprintf(buff+desc, "agg:"
2524 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
c33104f0
TW		 2525 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2526 lq_sta->lq.agg_params.agg_dis_start_th,
2527 lq_sta->lq.agg_params.agg_frame_cnt_limit);
5ae212c9
ZY		 2528
2529 desc += sprintf(buff+desc,
2530 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
c33104f0
TW		 2531 lq_sta->lq.general_params.start_rate_index[0],
2532 lq_sta->lq.general_params.start_rate_index[1],
2533 lq_sta->lq.general_params.start_rate_index[2],
2534 lq_sta->lq.general_params.start_rate_index[3]);
5ae212c9
ZY		 2535
2536
2537 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2538 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
c33104f0 2539 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
5ae212c9
ZY		 2540
2541 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2542}
2543
2544static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
98d7e09a 2545 .write = rs_sta_dbgfs_scale_table_write,
5ae212c9
ZY		 2546 .read = rs_sta_dbgfs_scale_table_read,
2547 .open = open_file_generic,
2548};
0209dc11
ZY		 2549static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2550 char __user *user_buf, size_t count, loff_t *ppos)
2551{
2552 char buff[1024];
2553 int desc = 0;
2554 int i, j;
2555
c33104f0 2556 struct iwl4965_lq_sta *lq_sta = file->private_data;
0209dc11
ZY		 2557 for (i = 0; i < LQ_SIZE; i++) {
2558 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2559 "rate=0x%X\n",
c33104f0
TW		 2560 lq_sta->active_tbl == i?"*":"x",
2561 lq_sta->lq_info[i].lq_type,
2562 lq_sta->lq_info[i].is_SGI,
2563 lq_sta->lq_info[i].is_fat,
2564 lq_sta->lq_info[i].is_dup,
39e88504 2565 lq_sta->lq_info[i].current_rate);
0209dc11
ZY		 2566 for (j = 0; j < IWL_RATE_COUNT; j++) {
2567 desc += sprintf(buff+desc,
c33104f0
TW		 2568 "counter=%d success=%d %%=%d\n",
2569 lq_sta->lq_info[i].win[j].counter,
2570 lq_sta->lq_info[i].win[j].success_counter,
2571 lq_sta->lq_info[i].win[j].success_ratio);
0209dc11
ZY		 2572 }
2573 }
2574 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2575}
2576
2577static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2578 .read = rs_sta_dbgfs_stats_table_read,
2579 .open = open_file_generic,
2580};
5ae212c9 2581
93dc646a
ZY		 2582static void rs_add_debugfs(void *priv, void *priv_sta,
2583 struct dentry *dir)
2584{
c33104f0
TW		 2585 struct iwl4965_lq_sta *lq_sta = priv_sta;
2586 lq_sta->rs_sta_dbgfs_scale_table_file =
0209dc11 2587 debugfs_create_file("rate_scale_table", 0600, dir,
c33104f0
TW		 2588 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2589 lq_sta->rs_sta_dbgfs_stats_table_file =
0209dc11 2590 debugfs_create_file("rate_stats_table", 0600, dir,
c33104f0 2591 lq_sta, &rs_sta_dbgfs_stats_table_ops);
0c11b4de
RR		 2592 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2593 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
2594 &lq_sta->tx_agg_tid_en);
0c11b4de 2595
93dc646a
ZY		 2596}
2597
2598static void rs_remove_debugfs(void *priv, void *priv_sta)
2599{
c33104f0
TW		 2600 struct iwl4965_lq_sta *lq_sta = priv_sta;
2601 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2602 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
0c11b4de 2603 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
93dc646a
ZY		 2604}
2605#endif
2606
b481de9c
ZY		 2607static struct rate_control_ops rs_ops = {
2608 .module = NULL,
2609 .name = RS_NAME,
2610 .tx_status = rs_tx_status,
2611 .get_rate = rs_get_rate,
2612 .rate_init = rs_rate_init,
2613 .clear = rs_clear,
2614 .alloc = rs_alloc,
2615 .free = rs_free,
2616 .alloc_sta = rs_alloc_sta,
2617 .free_sta = rs_free_sta,
93dc646a
ZY		 2618#ifdef CONFIG_MAC80211_DEBUGFS
2619 .add_sta_debugfs = rs_add_debugfs,
2620 .remove_sta_debugfs = rs_remove_debugfs,
2621#endif
b481de9c
ZY		 2622};
2623
bb8c093b 2624int iwl4965_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id)
b481de9c
ZY		 2625{
2626 struct ieee80211_local *local = hw_to_local(hw);
c79dd5b5 2627 struct iwl_priv *priv = hw->priv;
c33104f0 2628 struct iwl4965_lq_sta *lq_sta;
b481de9c 2629 struct sta_info *sta;
c33104f0 2630 int cnt = 0, i;
b481de9c
ZY		 2631 u32 samples = 0, success = 0, good = 0;
2632 unsigned long now = jiffies;
2633 u32 max_time = 0;
2634 u8 lq_type, antenna;
2635
d0709a65
JB		 2636 rcu_read_lock();
2637
b481de9c
ZY		 2638 sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
2639 if (!sta || !sta->rate_ctrl_priv) {
d0709a65 2640 if (sta)
b481de9c 2641 IWL_DEBUG_RATE("leave - no private rate data!\n");
d0709a65 2642 else
b481de9c 2643 IWL_DEBUG_RATE("leave - no station!\n");
d0709a65 2644 rcu_read_unlock();
b481de9c
ZY		 2645 return sprintf(buf, "station %d not found\n", sta_id);
2646 }
2647
c33104f0 2648 lq_sta = (void *)sta->rate_ctrl_priv;
b481de9c 2649
c33104f0 2650 lq_type = lq_sta->lq_info[lq_sta->active_tbl].lq_type;
fde0db31 2651 antenna = lq_sta->lq_info[lq_sta->active_tbl].ant_type;
b481de9c
ZY		 2652
2653 if (is_legacy(lq_type))
2654 i = IWL_RATE_54M_INDEX;
2655 else
2656 i = IWL_RATE_60M_INDEX;
2657 while (1) {
2658 u64 mask;
2659 int j;
c33104f0 2660 int active = lq_sta->active_tbl;
b481de9c 2661
c33104f0 2662 cnt +=
1826dcc0 2663 sprintf(&buf[cnt], " %2dMbs: ", iwl_rates[i].ieee / 2);
b481de9c
ZY		 2664
2665 mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1));
2666 for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1)
c33104f0
TW		 2667 buf[cnt++] =
2668 (lq_sta->lq_info[active].win[i].data & mask)
b481de9c
ZY		 2669 ? '1' : '0';
2670
c33104f0
TW		 2671 samples += lq_sta->lq_info[active].win[i].counter;
2672 good += lq_sta->lq_info[active].win[i].success_counter;
2673 success += lq_sta->lq_info[active].win[i].success_counter *
1826dcc0 2674 iwl_rates[i].ieee;
b481de9c 2675
c33104f0 2676 if (lq_sta->lq_info[active].win[i].stamp) {
b481de9c
ZY		 2677 int delta =
2678 jiffies_to_msecs(now -
c33104f0 2679 lq_sta->lq_info[active].win[i].stamp);
b481de9c
ZY		 2680
2681 if (delta > max_time)
2682 max_time = delta;
2683
c33104f0 2684 cnt += sprintf(&buf[cnt], "%5dms\n", delta);
b481de9c 2685 } else
c33104f0 2686 buf[cnt++] = '\n';
b481de9c 2687
bb8c093b 2688 j = iwl4965_get_prev_ieee_rate(i);
b481de9c
ZY		 2689 if (j == i)
2690 break;
2691 i = j;
2692 }
2693
1826dcc0
TW		 2694 /*
2695 * Display the average rate of all samples taken.
2696 * NOTE: We multiply # of samples by 2 since the IEEE measurement
2697 * added from iwl_rates is actually 2X the rate.
2698 */
b481de9c 2699 if (samples)
c33104f0 2700 cnt += sprintf(&buf[cnt],
b481de9c
ZY		 2701 "\nAverage rate is %3d.%02dMbs over last %4dms\n"
2702 "%3d%% success (%d good packets over %d tries)\n",
2703 success / (2 * samples), (success * 5 / samples) % 10,
2704 max_time, good * 100 / samples, good, samples);
2705 else
c33104f0
TW		 2706 cnt += sprintf(&buf[cnt], "\nAverage rate: 0Mbs\n");
2707
2708 cnt += sprintf(&buf[cnt], "\nrate scale type %d antenna %d "
b481de9c 2709 "active_search %d rate index %d\n", lq_type, antenna,
8318d78a 2710 lq_sta->search_better_tbl, sta->last_txrate_idx);
b481de9c 2711
d0709a65 2712 rcu_read_unlock();
c33104f0 2713 return cnt;
b481de9c
ZY		 2714}
2715
bb8c093b 2716void iwl4965_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
b481de9c 2717{
c79dd5b5 2718 struct iwl_priv *priv = hw->priv;
b481de9c
ZY		 2719
2720 priv->lq_mngr.lq_ready = 1;
2721}
2722
897e1cf2 2723int iwl4965_rate_control_register(void)
b481de9c 2724{
897e1cf2 2725 return ieee80211_rate_control_register(&rs_ops);
b481de9c
ZY		 2726}
2727
897e1cf2 2728void iwl4965_rate_control_unregister(void)
b481de9c
ZY		 2729{
2730 ieee80211_rate_control_unregister(&rs_ops);
2731}
2732
Linux 6.x block layer and io_uring tree(s)