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iwlwifi: rename iwl-4965-debug.h back to iwl-debug.h
[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>
31#include <net/ieee80211.h>
32
33#include <linux/netdevice.h>
34#include <linux/etherdevice.h>
35#include <linux/delay.h>
36
37#include <linux/workqueue.h>
38
b481de9c
ZY		 39#include "../net/mac80211/ieee80211_rate.h"
40
5d08cd1d 41#include "iwl-4965.h"
b481de9c
ZY		 42#include "iwl-helpers.h"
43
44#define RS_NAME "iwl-4965-rs"
45
46#define NUM_TRY_BEFORE_ANTENNA_TOGGLE 1
47#define IWL_NUMBER_TRY 1
48#define IWL_HT_NUMBER_TRY 3
49
77626355
BC		 50#define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
51#define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
52#define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
53
54/* max time to accum history 2 seconds */
55#define IWL_RATE_SCALE_FLUSH_INTVL (2*HZ)
b481de9c
ZY		 56
57static u8 rs_ht_to_legacy[] = {
58 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
59 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
60 IWL_RATE_6M_INDEX,
61 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
62 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
63 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
64 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
65};
66
bb8c093b 67struct iwl4965_rate {
b481de9c
ZY		 68 u32 rate_n_flags;
69} __attribute__ ((packed));
70
77626355
BC		 71/**
72 * struct iwl4965_rate_scale_data -- tx success history for one rate
73 */
bb8c093b 74struct iwl4965_rate_scale_data {
77626355
BC		 75 u64 data; /* bitmap of successful frames */
76 s32 success_counter; /* number of frames successful */
77 s32 success_ratio; /* per-cent * 128 */
78 s32 counter; /* number of frames attempted */
79 s32 average_tpt; /* success ratio * expected throughput */
b481de9c
ZY		 80 unsigned long stamp;
81};
82
77626355
BC		 83/**
84 * struct iwl4965_scale_tbl_info -- tx params and success history for all rates
85 *
0c11b4de 86 * There are two of these in struct iwl4965_lq_sta,
77626355
BC		 87 * one for "active", and one for "search".
88 */
bb8c093b
CH		 89struct iwl4965_scale_tbl_info {
90 enum iwl4965_table_type lq_type;
91 enum iwl4965_antenna_type antenna_type;
77626355
BC		 92 u8 is_SGI; /* 1 = short guard interval */
93 u8 is_fat; /* 1 = 40 MHz channel width */
94 u8 is_dup; /* 1 = duplicated data streams */
95 u8 action; /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
96 s32 *expected_tpt; /* throughput metrics; expected_tpt_G, etc. */
97 struct iwl4965_rate current_rate; /* rate_n_flags, uCode API format */
98 struct iwl4965_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
b481de9c
ZY		 99};
100
0c11b4de
RR		 101#ifdef CONFIG_IWL4965_HT
102
103struct iwl4965_traffic_load {
104 unsigned long time_stamp; /* age of the oldest statistics */
105 u32 packet_count[TID_QUEUE_MAX_SIZE]; /* packet count in this time
106 * slice */
107 u32 total; /* total num of packets during the
108 * last TID_MAX_TIME_DIFF */
109 u8 queue_count; /* number of queues that has
110 * been used since the last cleanup */
111 u8 head; /* start of the circular buffer */
112};
113
114#endif /* CONFIG_IWL4965_HT */
115
77626355 116/**
0c11b4de 117 * struct iwl4965_lq_sta -- driver's rate scaling private structure
77626355
BC		 118 *
119 * Pointer to this gets passed back and forth between driver and mac80211.
120 */
c33104f0 121struct iwl4965_lq_sta {
77626355
BC		 122 u8 active_tbl; /* index of active table, range 0-1 */
123 u8 enable_counter; /* indicates HT mode */
124 u8 stay_in_tbl; /* 1: disallow, 0: allow search for new mode */
125 u8 search_better_tbl; /* 1: currently trying alternate mode */
b481de9c 126 s32 last_tpt;
77626355
BC		 127
128 /* The following determine when to search for a new mode */
b481de9c 129 u32 table_count_limit;
77626355
BC		 130 u32 max_failure_limit; /* # failed frames before new search */
131 u32 max_success_limit; /* # successful frames before new search */
b481de9c 132 u32 table_count;
77626355
BC		 133 u32 total_failed; /* total failed frames, any/all rates */
134 u32 total_success; /* total successful frames, any/all rates */
135 u32 flush_timer; /* time staying in mode before new search */
136
137 u8 action_counter; /* # mode-switch actions tried */
b481de9c
ZY		 138 u8 antenna;
139 u8 valid_antenna;
140 u8 is_green;
141 u8 is_dup;
8318d78a 142 enum ieee80211_band band;
b481de9c 143 u8 ibss_sta_added;
77626355
BC		 144
145 /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
02dede04 146 u32 supp_rates;
b481de9c
ZY		 147 u16 active_rate;
148 u16 active_siso_rate;
149 u16 active_mimo_rate;
150 u16 active_rate_basic;
77626355 151
bb8c093b 152 struct iwl4965_link_quality_cmd lq;
77626355 153 struct iwl4965_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
0c11b4de
RR		 154#ifdef CONFIG_IWL4965_HT
155 struct iwl4965_traffic_load load[TID_MAX_LOAD_COUNT];
156 u8 tx_agg_tid_en;
157#endif
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
RR		 161#ifdef CONFIG_IWL4965_HT
162 struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
163#endif
bb8c093b
CH		 164 struct iwl4965_rate dbg_fixed;
165 struct iwl4965_priv *drv;
5ae212c9 166#endif
b481de9c
ZY		 167};
168
bb8c093b 169static void rs_rate_scale_perform(struct iwl4965_priv *priv,
b481de9c
ZY		 170 struct net_device *dev,
171 struct ieee80211_hdr *hdr,
172 struct sta_info *sta);
c33104f0 173static void rs_fill_link_cmd(struct iwl4965_lq_sta *lq_sta,
bb8c093b
CH		 174 struct iwl4965_rate *tx_mcs,
175 struct iwl4965_link_quality_cmd *tbl);
b481de9c
ZY		 176
177
98d7e09a 178#ifdef CONFIG_MAC80211_DEBUGFS
c33104f0 179static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
bb8c093b 180 struct iwl4965_rate *mcs, int index);
98d7e09a 181#else
c33104f0 182static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
bb8c093b 183 struct iwl4965_rate *mcs, int index)
98d7e09a
ZY		 184{}
185#endif
77626355
BC		 186
187/*
188 * Expected throughput metrics for following rates:
189 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
190 * "G" is the only table that supports CCK (the first 4 rates).
191 */
b481de9c
ZY		 192static s32 expected_tpt_A[IWL_RATE_COUNT] = {
193 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
194};
195
196static s32 expected_tpt_G[IWL_RATE_COUNT] = {
197 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
198};
199
200static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
201 0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
202};
203
204static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
205 0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
206};
207
208static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
209 0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
210};
211
212static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
213 0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
214};
215
216static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
217 0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
218};
219
220static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
221 0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
222};
223
224static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
225 0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
226};
227
228static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
229 0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
230};
231
bb8c093b
CH		 232static int iwl4965_lq_sync_callback(struct iwl4965_priv *priv,
233 struct iwl4965_cmd *cmd, struct sk_buff *skb)
b481de9c
ZY		 234{
235 /*We didn't cache the SKB; let the caller free it */
236 return 1;
237}
238
bb8c093b 239static inline u8 iwl4965_rate_get_rate(u32 rate_n_flags)
b481de9c
ZY		 240{
241 return (u8)(rate_n_flags & 0xFF);
242}
243
bb8c093b
CH		 244static int rs_send_lq_cmd(struct iwl4965_priv *priv,
245 struct iwl4965_link_quality_cmd *lq, u8 flags)
b481de9c 246{
0a6857e7 247#ifdef CONFIG_IWLWIFI_DEBUG
b481de9c
ZY		 248 int i;
249#endif
bb8c093b 250 struct iwl4965_host_cmd cmd = {
b481de9c 251 .id = REPLY_TX_LINK_QUALITY_CMD,
bb8c093b 252 .len = sizeof(struct iwl4965_link_quality_cmd),
b481de9c
ZY		 253 .meta.flags = flags,
254 .data = lq,
255 };
256
257 if ((lq->sta_id == 0xFF) &&
258 (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
dc2453ae 259 return -EINVAL;
b481de9c
ZY		 260
261 if (lq->sta_id == 0xFF)
262 lq->sta_id = IWL_AP_ID;
263
264 IWL_DEBUG_RATE("lq station id 0x%x\n", lq->sta_id);
265 IWL_DEBUG_RATE("lq dta 0x%X 0x%X\n",
266 lq->general_params.single_stream_ant_msk,
267 lq->general_params.dual_stream_ant_msk);
0a6857e7 268#ifdef CONFIG_IWLWIFI_DEBUG
b481de9c
ZY		 269 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
270 IWL_DEBUG_RATE("lq index %d 0x%X\n",
271 i, lq->rs_table[i].rate_n_flags);
272#endif
273
274 if (flags & CMD_ASYNC)
bb8c093b 275 cmd.meta.u.callback = iwl4965_lq_sync_callback;
b481de9c 276
bb8c093b 277 if (iwl4965_is_associated(priv) && priv->assoc_station_added &&
b481de9c 278 priv->lq_mngr.lq_ready)
bb8c093b 279 return iwl4965_send_cmd(priv, &cmd);
b481de9c 280
dc2453ae 281 return 0;
b481de9c
ZY		 282}
283
bb8c093b 284static void rs_rate_scale_clear_window(struct iwl4965_rate_scale_data *window)
b481de9c
ZY		 285{
286 window->data = 0;
287 window->success_counter = 0;
288 window->success_ratio = IWL_INVALID_VALUE;
289 window->counter = 0;
290 window->average_tpt = IWL_INVALID_VALUE;
291 window->stamp = 0;
b481de9c
ZY		 292}
293
0c11b4de
RR		 294#ifdef CONFIG_IWL4965_HT
295/*
296 * removes the old data from the statistics. All data that is older than
297 * TID_MAX_TIME_DIFF, will be deleted.
298 */
299static void rs_tl_rm_old_stats(struct iwl4965_traffic_load *tl, u32 curr_time)
300{
301 /* The oldest age we want to keep */
302 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
303
304 while (tl->queue_count &&
305 (tl->time_stamp < oldest_time)) {
306 tl->total -= tl->packet_count[tl->head];
307 tl->packet_count[tl->head] = 0;
308 tl->time_stamp += TID_QUEUE_CELL_SPACING;
309 tl->queue_count--;
310 tl->head++;
311 if (tl->head >= TID_QUEUE_MAX_SIZE)
312 tl->head = 0;
313 }
314}
315
316/*
317 * increment traffic load value for tid and also remove
318 * any old values if passed the certain time period
319 */
320static void rs_tl_add_packet(struct iwl4965_lq_sta *lq_data, u8 tid)
321{
322 u32 curr_time = jiffies_to_msecs(jiffies);
323 u32 time_diff;
324 s32 index;
325 struct iwl4965_traffic_load *tl = NULL;
326
327 if (tid >= TID_MAX_LOAD_COUNT)
328 return;
329
330 tl = &lq_data->load[tid];
331
332 curr_time -= curr_time % TID_ROUND_VALUE;
333
334 /* Happens only for the first packet. Initialize the data */
335 if (!(tl->queue_count)) {
336 tl->total = 1;
337 tl->time_stamp = curr_time;
338 tl->queue_count = 1;
339 tl->head = 0;
340 tl->packet_count[0] = 1;
341 return;
342 }
343
344 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
345 index = time_diff / TID_QUEUE_CELL_SPACING;
346
347 /* The history is too long: remove data that is older than */
348 /* TID_MAX_TIME_DIFF */
349 if (index >= TID_QUEUE_MAX_SIZE)
350 rs_tl_rm_old_stats(tl, curr_time);
351
352 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
353 tl->packet_count[index] = tl->packet_count[index] + 1;
354 tl->total = tl->total + 1;
355
356 if ((index + 1) > tl->queue_count)
357 tl->queue_count = index + 1;
358}
359
360/*
361 get the traffic load value for tid
362*/
363static u32 rs_tl_get_load(struct iwl4965_lq_sta *lq_data, u8 tid)
364{
365 u32 curr_time = jiffies_to_msecs(jiffies);
366 u32 time_diff;
367 s32 index;
368 struct iwl4965_traffic_load *tl = NULL;
369
370 if (tid >= TID_MAX_LOAD_COUNT)
371 return 0;
372
373 tl = &(lq_data->load[tid]);
374
375 curr_time -= curr_time % TID_ROUND_VALUE;
376
377 if (!(tl->queue_count))
378 return 0;
379
380 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
381 index = time_diff / TID_QUEUE_CELL_SPACING;
382
383 /* The history is too long: remove data that is older than */
384 /* TID_MAX_TIME_DIFF */
385 if (index >= TID_QUEUE_MAX_SIZE)
386 rs_tl_rm_old_stats(tl, curr_time);
387
388 return tl->total;
389}
390
391static void rs_tl_turn_on_agg_for_tid(struct iwl4965_priv *priv,
392 struct iwl4965_lq_sta *lq_data, u8 tid,
393 struct sta_info *sta)
394{
395 unsigned long state;
396 DECLARE_MAC_BUF(mac);
397
398 spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
399 state = sta->ampdu_mlme.tid_tx[tid].state;
400 spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
401
402 if (state == HT_AGG_STATE_IDLE &&
403 rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
404 IWL_DEBUG_HT("Starting Tx agg: STA: %s tid: %d\n",
405 print_mac(mac, sta->addr), tid);
406 ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
407 }
408}
409
410static void rs_tl_turn_on_agg(struct iwl4965_priv *priv, u8 tid,
411 struct iwl4965_lq_sta *lq_data,
412 struct sta_info *sta)
413{
414 if ((tid < TID_MAX_LOAD_COUNT))
415 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
416 else if (tid == IWL_AGG_ALL_TID)
417 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
418 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
419}
420
421#endif /* CONFIG_IWLWIFI_HT */
422
77626355
BC		 423/**
424 * rs_collect_tx_data - Update the success/failure sliding window
425 *
426 * We keep a sliding window of the last 62 packets transmitted
427 * at this rate. window->data contains the bitmask of successful
428 * packets.
429 */
bb8c093b 430static int rs_collect_tx_data(struct iwl4965_rate_scale_data *windows,
99556438
RR		 431 int scale_index, s32 tpt, int retries,
432 int successes)
b481de9c 433{
bb8c093b 434 struct iwl4965_rate_scale_data *window = NULL;
b481de9c
ZY		 435 u64 mask;
436 u8 win_size = IWL_RATE_MAX_WINDOW;
437 s32 fail_count;
438
dc2453ae
TW		 439 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
440 return -EINVAL;
b481de9c 441
77626355 442 /* Select data for current tx bit rate */
b481de9c
ZY		 443 window = &(windows[scale_index]);
444
77626355
BC		 445 /*
446 * Keep track of only the latest 62 tx frame attempts in this rate's
447 * history window; anything older isn't really relevant any more.
448 * If we have filled up the sliding window, drop the oldest attempt;
449 * if the oldest attempt (highest bit in bitmap) shows "success",
450 * subtract "1" from the success counter (this is the main reason
451 * we keep these bitmaps!).
452 */
99556438
RR		 453 while (retries > 0) {
454 if (window->counter >= win_size) {
455 window->counter = win_size - 1;
456 mask = 1;
457 mask = (mask << (win_size - 1));
458 if (window->data & mask) {
459 window->data &= ~mask;
460 window->success_counter =
461 window->success_counter - 1;
462 }
b481de9c 463 }
b481de9c 464
99556438
RR		 465 /* Increment frames-attempted counter */
466 window->counter++;
467
468 /* Shift bitmap by one frame (throw away oldest history),
469 * OR in "1", and increment "success" if this
470 * frame was successful. */
471 mask = window->data;
472 window->data = (mask << 1);
473 if (successes > 0) {
474 window->success_counter = window->success_counter + 1;
475 window->data |= 0x1;
476 successes--;
477 }
77626355 478
99556438 479 retries--;
b481de9c
ZY		 480 }
481
77626355 482 /* Calculate current success ratio, avoid divide-by-0! */
b481de9c
ZY		 483 if (window->counter > 0)
484 window->success_ratio = 128 * (100 * window->success_counter)
485 / window->counter;
486 else
487 window->success_ratio = IWL_INVALID_VALUE;
488
489 fail_count = window->counter - window->success_counter;
490
77626355 491 /* Calculate average throughput, if we have enough history. */
b481de9c
ZY		 492 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
493 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
494 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
495 else
496 window->average_tpt = IWL_INVALID_VALUE;
497
77626355 498 /* Tag this window as having been updated */
b481de9c
ZY		 499 window->stamp = jiffies;
500
dc2453ae 501 return 0;
b481de9c
ZY		 502}
503
77626355
BC		 504/*
505 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
506 */
bb8c093b
CH		 507static void rs_mcs_from_tbl(struct iwl4965_rate *mcs_rate,
508 struct iwl4965_scale_tbl_info *tbl,
b481de9c
ZY		 509 int index, u8 use_green)
510{
b481de9c 511 if (is_legacy(tbl->lq_type)) {
bb8c093b 512 mcs_rate->rate_n_flags = iwl4965_rates[index].plcp;
b481de9c
ZY		 513 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
514 mcs_rate->rate_n_flags |= RATE_MCS_CCK_MSK;
515
516 } else if (is_siso(tbl->lq_type)) {
517 if (index > IWL_LAST_OFDM_RATE)
518 index = IWL_LAST_OFDM_RATE;
bb8c093b 519 mcs_rate->rate_n_flags = iwl4965_rates[index].plcp_siso |
b481de9c
ZY		 520 RATE_MCS_HT_MSK;
521 } else {
522 if (index > IWL_LAST_OFDM_RATE)
523 index = IWL_LAST_OFDM_RATE;
bb8c093b 524 mcs_rate->rate_n_flags = iwl4965_rates[index].plcp_mimo |
b481de9c
ZY		 525 RATE_MCS_HT_MSK;
526 }
527
528 switch (tbl->antenna_type) {
529 case ANT_BOTH:
530 mcs_rate->rate_n_flags |= RATE_MCS_ANT_AB_MSK;
531 break;
532 case ANT_MAIN:
533 mcs_rate->rate_n_flags |= RATE_MCS_ANT_A_MSK;
534 break;
535 case ANT_AUX:
536 mcs_rate->rate_n_flags |= RATE_MCS_ANT_B_MSK;
537 break;
538 case ANT_NONE:
539 break;
540 }
541
542 if (is_legacy(tbl->lq_type))
dc2453ae 543 return;
b481de9c
ZY		 544
545 if (tbl->is_fat) {
546 if (tbl->is_dup)
547 mcs_rate->rate_n_flags |= RATE_MCS_DUP_MSK;
548 else
549 mcs_rate->rate_n_flags |= RATE_MCS_FAT_MSK;
550 }
551 if (tbl->is_SGI)
552 mcs_rate->rate_n_flags |= RATE_MCS_SGI_MSK;
553
554 if (use_green) {
555 mcs_rate->rate_n_flags |= RATE_MCS_GF_MSK;
556 if (is_siso(tbl->lq_type))
557 mcs_rate->rate_n_flags &= ~RATE_MCS_SGI_MSK;
558 }
b481de9c
ZY		 559}
560
77626355
BC		 561/*
562 * Interpret uCode API's rate_n_flags format,
563 * fill "search" or "active" tx mode table.
564 */
bb8c093b 565static int rs_get_tbl_info_from_mcs(const struct iwl4965_rate *mcs_rate,
8318d78a
JB		 566 enum ieee80211_band band,
567 struct iwl4965_scale_tbl_info *tbl,
b481de9c
ZY		 568 int *rate_idx)
569{
570 int index;
571 u32 ant_msk;
572
17744ff6 573 index = iwl4965_hwrate_to_plcp_idx(mcs_rate->rate_n_flags);
b481de9c
ZY		 574
575 if (index == IWL_RATE_INVALID) {
576 *rate_idx = -1;
dc2453ae 577 return -EINVAL;
b481de9c 578 }
77626355 579 tbl->is_SGI = 0; /* default legacy setup */
b481de9c
ZY		 580 tbl->is_fat = 0;
581 tbl->is_dup = 0;
77626355 582 tbl->antenna_type = ANT_BOTH; /* default MIMO setup */
b481de9c 583
77626355 584 /* legacy rate format */
b481de9c
ZY		 585 if (!(mcs_rate->rate_n_flags & RATE_MCS_HT_MSK)) {
586 ant_msk = (mcs_rate->rate_n_flags & RATE_MCS_ANT_AB_MSK);
587
588 if (ant_msk == RATE_MCS_ANT_AB_MSK)
589 tbl->lq_type = LQ_NONE;
590 else {
591
8318d78a 592 if (band == IEEE80211_BAND_5GHZ)
b481de9c
ZY		 593 tbl->lq_type = LQ_A;
594 else
595 tbl->lq_type = LQ_G;
596
597 if (mcs_rate->rate_n_flags & RATE_MCS_ANT_A_MSK)
598 tbl->antenna_type = ANT_MAIN;
599 else
600 tbl->antenna_type = ANT_AUX;
601 }
602 *rate_idx = index;
603
77626355 604 /* HT rate format, SISO (might be 20 MHz legacy or 40 MHz fat width) */
bb8c093b 605 } else if (iwl4965_rate_get_rate(mcs_rate->rate_n_flags)
b481de9c
ZY		 606 <= IWL_RATE_SISO_60M_PLCP) {
607 tbl->lq_type = LQ_SISO;
608
609 ant_msk = (mcs_rate->rate_n_flags & RATE_MCS_ANT_AB_MSK);
610 if (ant_msk == RATE_MCS_ANT_AB_MSK)
611 tbl->lq_type = LQ_NONE;
612 else {
613 if (mcs_rate->rate_n_flags & RATE_MCS_ANT_A_MSK)
614 tbl->antenna_type = ANT_MAIN;
615 else
616 tbl->antenna_type = ANT_AUX;
617 }
618 if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK)
619 tbl->is_SGI = 1;
620
621 if ((mcs_rate->rate_n_flags & RATE_MCS_FAT_MSK) ||
622 (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK))
623 tbl->is_fat = 1;
624
625 if (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK)
626 tbl->is_dup = 1;
627
628 *rate_idx = index;
77626355
BC		 629
630 /* HT rate format, MIMO (might be 20 MHz legacy or 40 MHz fat width) */
b481de9c
ZY		 631 } else {
632 tbl->lq_type = LQ_MIMO;
633 if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK)
634 tbl->is_SGI = 1;
635
636 if ((mcs_rate->rate_n_flags & RATE_MCS_FAT_MSK) ||
637 (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK))
638 tbl->is_fat = 1;
639
640 if (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK)
641 tbl->is_dup = 1;
642 *rate_idx = index;
643 }
644 return 0;
645}
646
bb8c093b
CH		 647static inline void rs_toggle_antenna(struct iwl4965_rate *new_rate,
648 struct iwl4965_scale_tbl_info *tbl)
b481de9c
ZY		 649{
650 if (tbl->antenna_type == ANT_AUX) {
651 tbl->antenna_type = ANT_MAIN;
652 new_rate->rate_n_flags &= ~RATE_MCS_ANT_B_MSK;
653 new_rate->rate_n_flags |= RATE_MCS_ANT_A_MSK;
654 } else {
655 tbl->antenna_type = ANT_AUX;
656 new_rate->rate_n_flags &= ~RATE_MCS_ANT_A_MSK;
657 new_rate->rate_n_flags |= RATE_MCS_ANT_B_MSK;
658 }
659}
660
270243a5
RR		 661static inline u8 rs_use_green(struct iwl4965_priv *priv,
662 struct ieee80211_conf *conf)
b481de9c 663{
c8b0e6e1 664#ifdef CONFIG_IWL4965_HT
270243a5
RR		 665 return ((conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) &&
666 priv->current_ht_config.is_green_field &&
667 !priv->current_ht_config.non_GF_STA_present);
668#endif /* CONFIG_IWL4965_HT */
dc2453ae 669 return 0;
b481de9c
ZY		 670}
671
672/**
673 * rs_get_supported_rates - get the available rates
674 *
675 * if management frame or broadcast frame only return
676 * basic available rates.
677 *
678 */
c33104f0 679static void rs_get_supported_rates(struct iwl4965_lq_sta *lq_sta,
b481de9c 680 struct ieee80211_hdr *hdr,
bb8c093b 681 enum iwl4965_table_type rate_type,
b481de9c
ZY		 682 u16 *data_rate)
683{
684 if (is_legacy(rate_type))
c33104f0 685 *data_rate = lq_sta->active_rate;
b481de9c
ZY		 686 else {
687 if (is_siso(rate_type))
c33104f0 688 *data_rate = lq_sta->active_siso_rate;
b481de9c 689 else
c33104f0 690 *data_rate = lq_sta->active_mimo_rate;
b481de9c
ZY		 691 }
692
693 if (hdr && is_multicast_ether_addr(hdr->addr1) &&
c33104f0
TW		 694 lq_sta->active_rate_basic) {
695 *data_rate = lq_sta->active_rate_basic;
696 }
b481de9c
ZY		 697}
698
699static u16 rs_get_adjacent_rate(u8 index, u16 rate_mask, int rate_type)
700{
701 u8 high = IWL_RATE_INVALID;
702 u8 low = IWL_RATE_INVALID;
703
01ebd063 704 /* 802.11A or ht walks to the next literal adjacent rate in
b481de9c
ZY		 705 * the rate table */
706 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
707 int i;
708 u32 mask;
709
710 /* Find the previous rate that is in the rate mask */
711 i = index - 1;
712 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
713 if (rate_mask & mask) {
714 low = i;
715 break;
716 }
717 }
718
719 /* Find the next rate that is in the rate mask */
720 i = index + 1;
721 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
722 if (rate_mask & mask) {
723 high = i;
724 break;
725 }
726 }
727
728 return (high << 8) | low;
729 }
730
731 low = index;
732 while (low != IWL_RATE_INVALID) {
bb8c093b 733 low = iwl4965_rates[low].prev_rs;
b481de9c
ZY		 734 if (low == IWL_RATE_INVALID)
735 break;
736 if (rate_mask & (1 << low))
737 break;
738 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
739 }
740
741 high = index;
742 while (high != IWL_RATE_INVALID) {
bb8c093b 743 high = iwl4965_rates[high].next_rs;
b481de9c
ZY		 744 if (high == IWL_RATE_INVALID)
745 break;
746 if (rate_mask & (1 << high))
747 break;
748 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
749 }
750
751 return (high << 8) | low;
752}
753
c33104f0 754static void rs_get_lower_rate(struct iwl4965_lq_sta *lq_sta,
bb8c093b
CH		 755 struct iwl4965_scale_tbl_info *tbl, u8 scale_index,
756 u8 ht_possible, struct iwl4965_rate *mcs_rate)
b481de9c 757{
b481de9c
ZY		 758 s32 low;
759 u16 rate_mask;
760 u16 high_low;
761 u8 switch_to_legacy = 0;
c33104f0 762 u8 is_green = lq_sta->is_green;
b481de9c
ZY		 763
764 /* check if we need to switch from HT to legacy rates.
765 * assumption is that mandatory rates (1Mbps or 6Mbps)
766 * are always supported (spec demand) */
767 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
768 switch_to_legacy = 1;
769 scale_index = rs_ht_to_legacy[scale_index];
8318d78a 770 if (lq_sta->band == IEEE80211_BAND_5GHZ)
b481de9c
ZY		 771 tbl->lq_type = LQ_A;
772 else
773 tbl->lq_type = LQ_G;
774
775 if ((tbl->antenna_type == ANT_BOTH) ||
776 (tbl->antenna_type == ANT_NONE))
777 tbl->antenna_type = ANT_MAIN;
778
779 tbl->is_fat = 0;
780 tbl->is_SGI = 0;
781 }
782
c33104f0 783 rs_get_supported_rates(lq_sta, NULL, tbl->lq_type, &rate_mask);
b481de9c 784
77626355 785 /* Mask with station rate restriction */
b481de9c 786 if (is_legacy(tbl->lq_type)) {
77626355 787 /* supp_rates has no CCK bits in A mode */
8318d78a 788 if (lq_sta->band == IEEE80211_BAND_5GHZ)
b481de9c 789 rate_mask = (u16)(rate_mask &
c33104f0 790 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
b481de9c 791 else
c33104f0 792 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
b481de9c
ZY		 793 }
794
77626355 795 /* If we switched from HT to legacy, check current rate */
dc2453ae 796 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
b481de9c 797 rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green);
dc2453ae 798 return;
b481de9c
ZY		 799 }
800
801 high_low = rs_get_adjacent_rate(scale_index, rate_mask, tbl->lq_type);
802 low = high_low & 0xff;
803
804 if (low != IWL_RATE_INVALID)
805 rs_mcs_from_tbl(mcs_rate, tbl, low, is_green);
806 else
807 rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green);
b481de9c
ZY		 808}
809
77626355
BC		 810/*
811 * mac80211 sends us Tx status
812 */
c33104f0 813static void rs_tx_status(void *priv_rate, struct net_device *dev,
b481de9c
ZY		 814 struct sk_buff *skb,
815 struct ieee80211_tx_status *tx_resp)
816{
817 int status;
818 u8 retries;
819 int rs_index, index = 0;
c33104f0 820 struct iwl4965_lq_sta *lq_sta;
bb8c093b 821 struct iwl4965_link_quality_cmd *table;
b481de9c
ZY		 822 struct sta_info *sta;
823 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
bb8c093b 824 struct iwl4965_priv *priv = (struct iwl4965_priv *)priv_rate;
b481de9c 825 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
4c424e4c 826 struct ieee80211_hw *hw = local_to_hw(local);
bb8c093b
CH		 827 struct iwl4965_rate_scale_data *window = NULL;
828 struct iwl4965_rate_scale_data *search_win = NULL;
829 struct iwl4965_rate tx_mcs;
830 struct iwl4965_scale_tbl_info tbl_type;
831 struct iwl4965_scale_tbl_info *curr_tbl, *search_tbl;
b481de9c
ZY		 832 u8 active_index = 0;
833 u16 fc = le16_to_cpu(hdr->frame_control);
834 s32 tpt = 0;
835
58826351 836 IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
b481de9c
ZY		 837
838 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1))
839 return;
840
99556438
RR		 841 /* This packet was aggregated but doesn't carry rate scale info */
842 if ((tx_resp->control.flags & IEEE80211_TXCTL_AMPDU) &&
843 !(tx_resp->flags & IEEE80211_TX_STATUS_AMPDU))
844 return;
845
b481de9c
ZY		 846 retries = tx_resp->retry_count;
847
848 if (retries > 15)
849 retries = 15;
850
d0709a65 851 rcu_read_lock();
b481de9c
ZY		 852
853 sta = sta_info_get(local, hdr->addr1);
854
f4d6082d
TW		 855 if (!sta || !sta->rate_ctrl_priv)
856 goto out;
857
b481de9c 858
c33104f0 859 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
b481de9c
ZY		 860
861 if (!priv->lq_mngr.lq_ready)
f4d6082d 862 goto out;
b481de9c 863
c33104f0
TW		 864 if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
865 !lq_sta->ibss_sta_added)
f4d6082d 866 goto out;
b481de9c 867
c33104f0
TW		 868 table = &lq_sta->lq;
869 active_index = lq_sta->active_tbl;
b481de9c 870
77626355 871 /* Get mac80211 antenna info */
c33104f0
TW		 872 lq_sta->antenna =
873 (lq_sta->valid_antenna & local->hw.conf.antenna_sel_tx);
874 if (!lq_sta->antenna)
875 lq_sta->antenna = lq_sta->valid_antenna;
b481de9c 876
77626355 877 /* Ignore mac80211 antenna info for now */
c33104f0 878 lq_sta->antenna = lq_sta->valid_antenna;
77626355 879
c33104f0
TW		 880 curr_tbl = &(lq_sta->lq_info[active_index]);
881 search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
bb8c093b 882 window = (struct iwl4965_rate_scale_data *)
b481de9c 883 &(curr_tbl->win[0]);
bb8c093b 884 search_win = (struct iwl4965_rate_scale_data *)
b481de9c
ZY		 885 &(search_tbl->win[0]);
886
77626355
BC		 887 /*
888 * Ignore this Tx frame response if its initial rate doesn't match
889 * that of latest Link Quality command. There may be stragglers
890 * from a previous Link Quality command, but we're no longer interested
891 * in those; they're either from the "active" mode while we're trying
892 * to check "search" mode, or a prior "search" mode after we've moved
893 * to a new "search" mode (which might become the new "active" mode).
894 */
4c424e4c
RR		 895 tx_mcs.rate_n_flags = le32_to_cpu(table->rs_table[0].rate_n_flags);
896 rs_get_tbl_info_from_mcs(&tx_mcs, priv->band, &tbl_type, &rs_index);
897 if (priv->band == IEEE80211_BAND_5GHZ)
898 rs_index -= IWL_FIRST_OFDM_RATE;
899
900 if ((tx_resp->control.tx_rate == NULL) ||
901 (tbl_type.is_SGI ^
902 !!(tx_resp->control.flags & IEEE80211_TXCTL_SHORT_GI)) ||
903 (tbl_type.is_fat ^
904 !!(tx_resp->control.flags & IEEE80211_TXCTL_40_MHZ_WIDTH)) ||
905 (tbl_type.is_dup ^
906 !!(tx_resp->control.flags & IEEE80211_TXCTL_DUP_DATA)) ||
907 (tbl_type.antenna_type ^
908 tx_resp->control.antenna_sel_tx) ||
909 (!!(tx_mcs.rate_n_flags & RATE_MCS_HT_MSK) ^
910 !!(tx_resp->control.flags & IEEE80211_TXCTL_OFDM_HT)) ||
911 (!!(tx_mcs.rate_n_flags & RATE_MCS_GF_MSK) ^
912 !!(tx_resp->control.flags & IEEE80211_TXCTL_GREEN_FIELD)) ||
913 (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
914 tx_resp->control.tx_rate->bitrate)) {
915 IWL_DEBUG_RATE("initial rate does not match 0x%x\n",
916 tx_mcs.rate_n_flags);
f4d6082d 917 goto out;
b481de9c
ZY		 918 }
919
77626355 920 /* Update frame history window with "failure" for each Tx retry. */
b481de9c 921 while (retries) {
77626355
BC		 922 /* Look up the rate and other info used for each tx attempt.
923 * Each tx attempt steps one entry deeper in the rate table. */
b481de9c
ZY		 924 tx_mcs.rate_n_flags =
925 le32_to_cpu(table->rs_table[index].rate_n_flags);
8318d78a 926 rs_get_tbl_info_from_mcs(&tx_mcs, priv->band,
b481de9c
ZY		 927 &tbl_type, &rs_index);
928
77626355
BC		 929 /* If type matches "search" table,
930 * add failure to "search" history */
b481de9c
ZY		 931 if ((tbl_type.lq_type == search_tbl->lq_type) &&
932 (tbl_type.antenna_type == search_tbl->antenna_type) &&
933 (tbl_type.is_SGI == search_tbl->is_SGI)) {
934 if (search_tbl->expected_tpt)
935 tpt = search_tbl->expected_tpt[rs_index];
936 else
937 tpt = 0;
99556438 938 rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
77626355
BC		 939
940 /* Else if type matches "current/active" table,
941 * add failure to "current/active" history */
b481de9c
ZY		 942 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
943 (tbl_type.antenna_type == curr_tbl->antenna_type) &&
944 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
945 if (curr_tbl->expected_tpt)
946 tpt = curr_tbl->expected_tpt[rs_index];
947 else
948 tpt = 0;
99556438 949 rs_collect_tx_data(window, rs_index, tpt, 1, 0);
b481de9c 950 }
77626355
BC		 951
952 /* If not searching for a new mode, increment failed counter
953 * ... this helps determine when to start searching again */
c33104f0
TW		 954 if (lq_sta->stay_in_tbl)
955 lq_sta->total_failed++;
b481de9c
ZY		 956 --retries;
957 index++;
958
959 }
960
77626355
BC		 961 /*
962 * Find (by rate) the history window to update with final Tx attempt;
963 * if Tx was successful first try, use original rate,
964 * else look up the rate that was, finally, successful.
965 */
4c424e4c
RR		 966 tx_mcs.rate_n_flags = le32_to_cpu(table->rs_table[index].rate_n_flags);
967 rs_get_tbl_info_from_mcs(&tx_mcs, priv->band, &tbl_type, &rs_index);
b481de9c 968
77626355 969 /* Update frame history window with "success" if Tx got ACKed ... */
b481de9c
ZY		 970 if (tx_resp->flags & IEEE80211_TX_STATUS_ACK)
971 status = 1;
972 else
973 status = 0;
974
77626355
BC		 975 /* If type matches "search" table,
976 * add final tx status to "search" history */
b481de9c
ZY		 977 if ((tbl_type.lq_type == search_tbl->lq_type) &&
978 (tbl_type.antenna_type == search_tbl->antenna_type) &&
979 (tbl_type.is_SGI == search_tbl->is_SGI)) {
980 if (search_tbl->expected_tpt)
981 tpt = search_tbl->expected_tpt[rs_index];
982 else
983 tpt = 0;
99556438
RR		 984 if (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU)
985 rs_collect_tx_data(search_win, rs_index, tpt,
986 tx_resp->ampdu_ack_len,
987 tx_resp->ampdu_ack_map);
988 else
989 rs_collect_tx_data(search_win, rs_index, tpt,
990 1, status);
77626355
BC		 991 /* Else if type matches "current/active" table,
992 * add final tx status to "current/active" history */
b481de9c
ZY		 993 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
994 (tbl_type.antenna_type == curr_tbl->antenna_type) &&
995 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
996 if (curr_tbl->expected_tpt)
997 tpt = curr_tbl->expected_tpt[rs_index];
998 else
999 tpt = 0;
99556438
RR		 1000 if (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU)
1001 rs_collect_tx_data(window, rs_index, tpt,
1002 tx_resp->ampdu_ack_len,
1003 tx_resp->ampdu_ack_map);
1004 else
1005 rs_collect_tx_data(window, rs_index, tpt,
1006 1, status);
b481de9c
ZY		 1007 }
1008
77626355
BC		 1009 /* If not searching for new mode, increment success/failed counter
1010 * ... these help determine when to start searching again */
c33104f0 1011 if (lq_sta->stay_in_tbl) {
99556438
RR		 1012 if (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU) {
1013 lq_sta->total_success += tx_resp->ampdu_ack_map;
1014 lq_sta->total_failed +=
1015 (tx_resp->ampdu_ack_len - tx_resp->ampdu_ack_map);
1016 } else {
1017 if (status)
1018 lq_sta->total_success++;
1019 else
1020 lq_sta->total_failed++;
1021 }
b481de9c
ZY		 1022 }
1023
77626355 1024 /* See if there's a better rate or modulation mode to try. */
b481de9c 1025 rs_rate_scale_perform(priv, dev, hdr, sta);
f4d6082d 1026out:
d0709a65 1027 rcu_read_unlock();
b481de9c
ZY		 1028 return;
1029}
1030
1031static u8 rs_is_ant_connected(u8 valid_antenna,
bb8c093b 1032 enum iwl4965_antenna_type antenna_type)
b481de9c
ZY		 1033{
1034 if (antenna_type == ANT_AUX)
1035 return ((valid_antenna & 0x2) ? 1:0);
1036 else if (antenna_type == ANT_MAIN)
1037 return ((valid_antenna & 0x1) ? 1:0);
dc2453ae
TW		 1038 else if (antenna_type == ANT_BOTH)
1039 return ((valid_antenna & 0x3) == 0x3);
b481de9c
ZY		 1040
1041 return 1;
1042}
1043
1044static u8 rs_is_other_ant_connected(u8 valid_antenna,
bb8c093b 1045 enum iwl4965_antenna_type antenna_type)
b481de9c
ZY		 1046{
1047 if (antenna_type == ANT_AUX)
dc2453ae 1048 return rs_is_ant_connected(valid_antenna, ANT_MAIN);
b481de9c 1049 else
dc2453ae 1050 return rs_is_ant_connected(valid_antenna, ANT_AUX);
b481de9c
ZY		 1051
1052 return 0;
1053}
1054
77626355
BC		 1055/*
1056 * Begin a period of staying with a selected modulation mode.
1057 * Set "stay_in_tbl" flag to prevent any mode switches.
1058 * Set frame tx success limits according to legacy vs. high-throughput,
1059 * and reset overall (spanning all rates) tx success history statistics.
1060 * These control how long we stay using same modulation mode before
1061 * searching for a new mode.
1062 */
b481de9c 1063static void rs_set_stay_in_table(u8 is_legacy,
c33104f0 1064 struct iwl4965_lq_sta *lq_sta)
b481de9c
ZY		 1065{
1066 IWL_DEBUG_HT("we are staying in the same table\n");
c33104f0 1067 lq_sta->stay_in_tbl = 1; /* only place this gets set */
b481de9c 1068 if (is_legacy) {
c33104f0
TW		 1069 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1070 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1071 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
b481de9c 1072 } else {
c33104f0
TW		 1073 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1074 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1075 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
b481de9c 1076 }
c33104f0
TW		 1077 lq_sta->table_count = 0;
1078 lq_sta->total_failed = 0;
1079 lq_sta->total_success = 0;
b481de9c
ZY		 1080}
1081
77626355
BC		 1082/*
1083 * Find correct throughput table for given mode of modulation
1084 */
c33104f0 1085static void rs_get_expected_tpt_table(struct iwl4965_lq_sta *lq_sta,
bb8c093b 1086 struct iwl4965_scale_tbl_info *tbl)
b481de9c
ZY		 1087{
1088 if (is_legacy(tbl->lq_type)) {
1089 if (!is_a_band(tbl->lq_type))
1090 tbl->expected_tpt = expected_tpt_G;
1091 else
1092 tbl->expected_tpt = expected_tpt_A;
1093 } else if (is_siso(tbl->lq_type)) {
c33104f0 1094 if (tbl->is_fat && !lq_sta->is_dup)
b481de9c
ZY		 1095 if (tbl->is_SGI)
1096 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
1097 else
1098 tbl->expected_tpt = expected_tpt_siso40MHz;
1099 else if (tbl->is_SGI)
1100 tbl->expected_tpt = expected_tpt_siso20MHzSGI;
1101 else
1102 tbl->expected_tpt = expected_tpt_siso20MHz;
1103
1104 } else if (is_mimo(tbl->lq_type)) {
c33104f0 1105 if (tbl->is_fat && !lq_sta->is_dup)
b481de9c
ZY		 1106 if (tbl->is_SGI)
1107 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
1108 else
1109 tbl->expected_tpt = expected_tpt_mimo40MHz;
1110 else if (tbl->is_SGI)
1111 tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
1112 else
1113 tbl->expected_tpt = expected_tpt_mimo20MHz;
1114 } else
1115 tbl->expected_tpt = expected_tpt_G;
1116}
1117
c8b0e6e1 1118#ifdef CONFIG_IWL4965_HT
77626355
BC		 1119/*
1120 * Find starting rate for new "search" high-throughput mode of modulation.
1121 * Goal is to find lowest expected rate (under perfect conditions) that is
1122 * above the current measured throughput of "active" mode, to give new mode
1123 * a fair chance to prove itself without too many challenges.
1124 *
1125 * This gets called when transitioning to more aggressive modulation
1126 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1127 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1128 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1129 * bit rate will typically need to increase, but not if performance was bad.
1130 */
bb8c093b 1131static s32 rs_get_best_rate(struct iwl4965_priv *priv,
c33104f0 1132 struct iwl4965_lq_sta *lq_sta,
77626355 1133 struct iwl4965_scale_tbl_info *tbl, /* "search" */
b481de9c
ZY		 1134 u16 rate_mask, s8 index, s8 rate)
1135{
77626355 1136 /* "active" values */
bb8c093b 1137 struct iwl4965_scale_tbl_info *active_tbl =
c33104f0 1138 &(lq_sta->lq_info[lq_sta->active_tbl]);
b481de9c 1139 s32 active_sr = active_tbl->win[index].success_ratio;
b481de9c 1140 s32 active_tpt = active_tbl->expected_tpt[index];
77626355
BC		 1141
1142 /* expected "search" throughput */
1143 s32 *tpt_tbl = tbl->expected_tpt;
1144
1145 s32 new_rate, high, low, start_hi;
b481de9c
ZY		 1146 u16 high_low;
1147
1148 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1149
1150 for (; ;) {
1151 high_low = rs_get_adjacent_rate(rate, rate_mask, tbl->lq_type);
1152
1153 low = high_low & 0xff;
1154 high = (high_low >> 8) & 0xff;
1155
77626355
BC		 1156 /*
1157 * Lower the "search" bit rate, to give new "search" mode
1158 * approximately the same throughput as "active" if:
1159 *
1160 * 1) "Active" mode has been working modestly well (but not
1161 * great), and expected "search" throughput (under perfect
1162 * conditions) at candidate rate is above the actual
1163 * measured "active" throughput (but less than expected
1164 * "active" throughput under perfect conditions).
1165 * OR
1166 * 2) "Active" mode has been working perfectly or very well
1167 * and expected "search" throughput (under perfect
1168 * conditions) at candidate rate is above expected
1169 * "active" throughput (under perfect conditions).
1170 */
c33104f0 1171 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
b481de9c
ZY		 1172 ((active_sr > IWL_RATE_DECREASE_TH) &&
1173 (active_sr <= IWL_RATE_HIGH_TH) &&
1174 (tpt_tbl[rate] <= active_tpt))) ||
1175 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1176 (tpt_tbl[rate] > active_tpt))) {
1177
77626355
BC		 1178 /* (2nd or later pass)
1179 * If we've already tried to raise the rate, and are
1180 * now trying to lower it, use the higher rate. */
b481de9c
ZY		 1181 if (start_hi != IWL_RATE_INVALID) {
1182 new_rate = start_hi;
1183 break;
1184 }
77626355 1185
b481de9c 1186 new_rate = rate;
77626355
BC		 1187
1188 /* Loop again with lower rate */
b481de9c
ZY		 1189 if (low != IWL_RATE_INVALID)
1190 rate = low;
77626355
BC		 1191
1192 /* Lower rate not available, use the original */
b481de9c
ZY		 1193 else
1194 break;
77626355
BC		 1195
1196 /* Else try to raise the "search" rate to match "active" */
b481de9c 1197 } else {
77626355
BC		 1198 /* (2nd or later pass)
1199 * If we've already tried to lower the rate, and are
1200 * now trying to raise it, use the lower rate. */
b481de9c
ZY		 1201 if (new_rate != IWL_RATE_INVALID)
1202 break;
77626355
BC		 1203
1204 /* Loop again with higher rate */
b481de9c
ZY		 1205 else if (high != IWL_RATE_INVALID) {
1206 start_hi = high;
1207 rate = high;
77626355
BC		 1208
1209 /* Higher rate not available, use the original */
b481de9c
ZY		 1210 } else {
1211 new_rate = rate;
1212 break;
1213 }
1214 }
1215 }
1216
1217 return new_rate;
1218}
c8b0e6e1 1219#endif /* CONFIG_IWL4965_HT */
b481de9c
ZY		 1220
1221static inline u8 rs_is_both_ant_supp(u8 valid_antenna)
1222{
1223 return (rs_is_ant_connected(valid_antenna, ANT_BOTH));
1224}
1225
77626355
BC		 1226/*
1227 * Set up search table for MIMO
1228 */
bb8c093b 1229static int rs_switch_to_mimo(struct iwl4965_priv *priv,
c33104f0 1230 struct iwl4965_lq_sta *lq_sta,
270243a5
RR		 1231 struct ieee80211_conf *conf,
1232 struct sta_info *sta,
bb8c093b 1233 struct iwl4965_scale_tbl_info *tbl, int index)
b481de9c 1234{
c8b0e6e1 1235#ifdef CONFIG_IWL4965_HT
b481de9c
ZY		 1236 u16 rate_mask;
1237 s32 rate;
c33104f0 1238 s8 is_green = lq_sta->is_green;
b481de9c 1239
270243a5
RR		 1240 if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1241 !sta->ht_info.ht_supported)
b481de9c
ZY		 1242 return -1;
1243
1244 IWL_DEBUG_HT("LQ: try to switch to MIMO\n");
1245 tbl->lq_type = LQ_MIMO;
c33104f0 1246 rs_get_supported_rates(lq_sta, NULL, tbl->lq_type,
b481de9c
ZY		 1247 &rate_mask);
1248
270243a5 1249 if (priv->current_ht_config.tx_mimo_ps_mode == IWL_MIMO_PS_STATIC)
b481de9c
ZY		 1250 return -1;
1251
77626355 1252 /* Need both Tx chains/antennas to support MIMO */
c33104f0 1253 if (!rs_is_both_ant_supp(lq_sta->antenna))
b481de9c
ZY		 1254 return -1;
1255
c33104f0 1256 tbl->is_dup = lq_sta->is_dup;
b481de9c 1257 tbl->action = 0;
270243a5
RR		 1258 if (priv->current_ht_config.supported_chan_width
1259 == IWL_CHANNEL_WIDTH_40MHZ)
b481de9c
ZY		 1260 tbl->is_fat = 1;
1261 else
1262 tbl->is_fat = 0;
1263
1264 if (tbl->is_fat) {
270243a5 1265 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
b481de9c
ZY		 1266 tbl->is_SGI = 1;
1267 else
1268 tbl->is_SGI = 0;
270243a5 1269 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
b481de9c
ZY		 1270 tbl->is_SGI = 1;
1271 else
1272 tbl->is_SGI = 0;
1273
c33104f0 1274 rs_get_expected_tpt_table(lq_sta, tbl);
b481de9c 1275
c33104f0 1276 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index, index);
b481de9c
ZY		 1277
1278 IWL_DEBUG_HT("LQ: MIMO best rate %d mask %X\n", rate, rate_mask);
1279 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask))
1280 return -1;
1281 rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green);
1282
1283 IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
1284 tbl->current_rate.rate_n_flags, is_green);
dc2453ae 1285 return 0;
403ab56b
MA		 1286#else
1287 return -1;
0c11b4de 1288#endif /*CONFIG_IWL4965_HT */
b481de9c
ZY		 1289}
1290
77626355
BC		 1291/*
1292 * Set up search table for SISO
1293 */
bb8c093b 1294static int rs_switch_to_siso(struct iwl4965_priv *priv,
c33104f0 1295 struct iwl4965_lq_sta *lq_sta,
270243a5
RR		 1296 struct ieee80211_conf *conf,
1297 struct sta_info *sta,
bb8c093b 1298 struct iwl4965_scale_tbl_info *tbl, int index)
b481de9c 1299{
c8b0e6e1 1300#ifdef CONFIG_IWL4965_HT
b481de9c 1301 u16 rate_mask;
c33104f0 1302 u8 is_green = lq_sta->is_green;
b481de9c
ZY		 1303 s32 rate;
1304
1305 IWL_DEBUG_HT("LQ: try to switch to SISO\n");
270243a5
RR		 1306 if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1307 !sta->ht_info.ht_supported)
b481de9c
ZY		 1308 return -1;
1309
c33104f0 1310 tbl->is_dup = lq_sta->is_dup;
b481de9c
ZY		 1311 tbl->lq_type = LQ_SISO;
1312 tbl->action = 0;
c33104f0 1313 rs_get_supported_rates(lq_sta, NULL, tbl->lq_type,
b481de9c
ZY		 1314 &rate_mask);
1315
270243a5
RR		 1316 if (priv->current_ht_config.supported_chan_width
1317 == IWL_CHANNEL_WIDTH_40MHZ)
b481de9c
ZY		 1318 tbl->is_fat = 1;
1319 else
1320 tbl->is_fat = 0;
1321
1322 if (tbl->is_fat) {
270243a5 1323 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
b481de9c
ZY		 1324 tbl->is_SGI = 1;
1325 else
1326 tbl->is_SGI = 0;
270243a5 1327 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
b481de9c
ZY		 1328 tbl->is_SGI = 1;
1329 else
1330 tbl->is_SGI = 0;
1331
1332 if (is_green)
1333 tbl->is_SGI = 0;
1334
c33104f0
TW		 1335 rs_get_expected_tpt_table(lq_sta, tbl);
1336 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index, index);
b481de9c
ZY		 1337
1338 IWL_DEBUG_HT("LQ: get best rate %d mask %X\n", rate, rate_mask);
1339 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1340 IWL_DEBUG_HT("can not switch with index %d rate mask %x\n",
1341 rate, rate_mask);
1342 return -1;
1343 }
1344 rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green);
1345 IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
1346 tbl->current_rate.rate_n_flags, is_green);
403ab56b
MA		 1347 return 0;
1348#else
1349 return -1;
b481de9c 1350
0c11b4de 1351#endif /*CONFIG_IWL4965_HT */
b481de9c
ZY		 1352}
1353
77626355
BC		 1354/*
1355 * Try to switch to new modulation mode from legacy
1356 */
bb8c093b 1357static int rs_move_legacy_other(struct iwl4965_priv *priv,
c33104f0 1358 struct iwl4965_lq_sta *lq_sta,
270243a5
RR		 1359 struct ieee80211_conf *conf,
1360 struct sta_info *sta,
b481de9c
ZY		 1361 int index)
1362{
dc2453ae 1363 int ret = 0;
bb8c093b 1364 struct iwl4965_scale_tbl_info *tbl =
c33104f0 1365 &(lq_sta->lq_info[lq_sta->active_tbl]);
bb8c093b 1366 struct iwl4965_scale_tbl_info *search_tbl =
c33104f0 1367 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
bb8c093b
CH		 1368 struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1369 u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1370 (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
b481de9c
ZY		 1371 u8 start_action = tbl->action;
1372
1373 for (; ;) {
1374 switch (tbl->action) {
1375 case IWL_LEGACY_SWITCH_ANTENNA:
1376 IWL_DEBUG_HT("LQ Legacy switch Antenna\n");
1377
1378 search_tbl->lq_type = LQ_NONE;
c33104f0 1379 lq_sta->action_counter++;
77626355
BC		 1380
1381 /* Don't change antenna if success has been great */
b481de9c
ZY		 1382 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1383 break;
77626355
BC		 1384
1385 /* Don't change antenna if other one is not connected */
c33104f0 1386 if (!rs_is_other_ant_connected(lq_sta->antenna,
b481de9c
ZY		 1387 tbl->antenna_type))
1388 break;
1389
77626355 1390 /* Set up search table to try other antenna */
b481de9c
ZY		 1391 memcpy(search_tbl, tbl, sz);
1392
1393 rs_toggle_antenna(&(search_tbl->current_rate),
1394 search_tbl);
c33104f0
TW		 1395 rs_get_expected_tpt_table(lq_sta, search_tbl);
1396 lq_sta->search_better_tbl = 1;
b481de9c
ZY		 1397 goto out;
1398
1399 case IWL_LEGACY_SWITCH_SISO:
1400 IWL_DEBUG_HT("LQ: Legacy switch to SISO\n");
77626355
BC		 1401
1402 /* Set up search table to try SISO */
b481de9c
ZY		 1403 memcpy(search_tbl, tbl, sz);
1404 search_tbl->lq_type = LQ_SISO;
1405 search_tbl->is_SGI = 0;
1406 search_tbl->is_fat = 0;
c33104f0 1407 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
270243a5 1408 search_tbl, index);
dc2453ae 1409 if (!ret) {
c33104f0
TW		 1410 lq_sta->search_better_tbl = 1;
1411 lq_sta->action_counter = 0;
b481de9c 1412 goto out;
dc2453ae 1413 }
b481de9c
ZY		 1414
1415 break;
1416 case IWL_LEGACY_SWITCH_MIMO:
1417 IWL_DEBUG_HT("LQ: Legacy switch MIMO\n");
77626355
BC		 1418
1419 /* Set up search table to try MIMO */
b481de9c
ZY		 1420 memcpy(search_tbl, tbl, sz);
1421 search_tbl->lq_type = LQ_MIMO;
1422 search_tbl->is_SGI = 0;
1423 search_tbl->is_fat = 0;
1424 search_tbl->antenna_type = ANT_BOTH;
c33104f0 1425 ret = rs_switch_to_mimo(priv, lq_sta, conf, sta,
270243a5 1426 search_tbl, index);
dc2453ae 1427 if (!ret) {
c33104f0
TW		 1428 lq_sta->search_better_tbl = 1;
1429 lq_sta->action_counter = 0;
b481de9c 1430 goto out;
dc2453ae 1431 }
b481de9c
ZY		 1432 break;
1433 }
1434 tbl->action++;
1435 if (tbl->action > IWL_LEGACY_SWITCH_MIMO)
1436 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1437
1438 if (tbl->action == start_action)
1439 break;
1440
1441 }
1442 return 0;
1443
1444 out:
1445 tbl->action++;
1446 if (tbl->action > IWL_LEGACY_SWITCH_MIMO)
1447 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1448 return 0;
1449
1450}
1451
77626355
BC		 1452/*
1453 * Try to switch to new modulation mode from SISO
1454 */
bb8c093b 1455static int rs_move_siso_to_other(struct iwl4965_priv *priv,
c33104f0 1456 struct iwl4965_lq_sta *lq_sta,
270243a5
RR		 1457 struct ieee80211_conf *conf,
1458 struct sta_info *sta,
b481de9c
ZY		 1459 int index)
1460{
dc2453ae 1461 int ret;
c33104f0 1462 u8 is_green = lq_sta->is_green;
bb8c093b 1463 struct iwl4965_scale_tbl_info *tbl =
c33104f0 1464 &(lq_sta->lq_info[lq_sta->active_tbl]);
bb8c093b 1465 struct iwl4965_scale_tbl_info *search_tbl =
c33104f0 1466 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
bb8c093b
CH		 1467 struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1468 u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1469 (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
b481de9c
ZY		 1470 u8 start_action = tbl->action;
1471
1472 for (;;) {
c33104f0 1473 lq_sta->action_counter++;
b481de9c
ZY		 1474 switch (tbl->action) {
1475 case IWL_SISO_SWITCH_ANTENNA:
1476 IWL_DEBUG_HT("LQ: SISO SWITCH ANTENNA SISO\n");
1477 search_tbl->lq_type = LQ_NONE;
1478 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1479 break;
c33104f0 1480 if (!rs_is_other_ant_connected(lq_sta->antenna,
b481de9c
ZY		 1481 tbl->antenna_type))
1482 break;
1483
1484 memcpy(search_tbl, tbl, sz);
1485 search_tbl->action = IWL_SISO_SWITCH_MIMO;
1486 rs_toggle_antenna(&(search_tbl->current_rate),
1487 search_tbl);
c33104f0 1488 lq_sta->search_better_tbl = 1;
b481de9c
ZY		 1489
1490 goto out;
1491
1492 case IWL_SISO_SWITCH_MIMO:
1493 IWL_DEBUG_HT("LQ: SISO SWITCH TO MIMO FROM SISO\n");
1494 memcpy(search_tbl, tbl, sz);
1495 search_tbl->lq_type = LQ_MIMO;
1496 search_tbl->is_SGI = 0;
1497 search_tbl->is_fat = 0;
1498 search_tbl->antenna_type = ANT_BOTH;
c33104f0 1499 ret = rs_switch_to_mimo(priv, lq_sta, conf, sta,
270243a5 1500 search_tbl, index);
dc2453ae 1501 if (!ret) {
c33104f0 1502 lq_sta->search_better_tbl = 1;
b481de9c 1503 goto out;
dc2453ae 1504 }
b481de9c
ZY		 1505 break;
1506 case IWL_SISO_SWITCH_GI:
1507 IWL_DEBUG_HT("LQ: SISO SWITCH TO GI\n");
0c11b4de 1508
b481de9c
ZY		 1509 memcpy(search_tbl, tbl, sz);
1510 search_tbl->action = 0;
1511 if (search_tbl->is_SGI)
1512 search_tbl->is_SGI = 0;
1513 else if (!is_green)
1514 search_tbl->is_SGI = 1;
1515 else
1516 break;
c33104f0 1517 lq_sta->search_better_tbl = 1;
b481de9c
ZY		 1518 if ((tbl->lq_type == LQ_SISO) &&
1519 (tbl->is_SGI)) {
c33104f0 1520 s32 tpt = lq_sta->last_tpt / 100;
b481de9c
ZY		 1521 if (((!tbl->is_fat) &&
1522 (tpt >= expected_tpt_siso20MHz[index])) ||
1523 ((tbl->is_fat) &&
1524 (tpt >= expected_tpt_siso40MHz[index])))
c33104f0 1525 lq_sta->search_better_tbl = 0;
b481de9c 1526 }
c33104f0 1527 rs_get_expected_tpt_table(lq_sta, search_tbl);
b481de9c
ZY		 1528 rs_mcs_from_tbl(&search_tbl->current_rate,
1529 search_tbl, index, is_green);
1530 goto out;
1531 }
1532 tbl->action++;
1533 if (tbl->action > IWL_SISO_SWITCH_GI)
1534 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1535
1536 if (tbl->action == start_action)
1537 break;
1538 }
1539 return 0;
1540
1541 out:
1542 tbl->action++;
1543 if (tbl->action > IWL_SISO_SWITCH_GI)
1544 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1545 return 0;
1546}
1547
77626355
BC		 1548/*
1549 * Try to switch to new modulation mode from MIMO
1550 */
bb8c093b 1551static int rs_move_mimo_to_other(struct iwl4965_priv *priv,
c33104f0 1552 struct iwl4965_lq_sta *lq_sta,
270243a5
RR		 1553 struct ieee80211_conf *conf,
1554 struct sta_info *sta,
b481de9c
ZY		 1555 int index)
1556{
dc2453ae 1557 int ret;
c33104f0 1558 s8 is_green = lq_sta->is_green;
bb8c093b 1559 struct iwl4965_scale_tbl_info *tbl =
c33104f0 1560 &(lq_sta->lq_info[lq_sta->active_tbl]);
bb8c093b 1561 struct iwl4965_scale_tbl_info *search_tbl =
c33104f0 1562 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
bb8c093b
CH		 1563 u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1564 (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
b481de9c
ZY		 1565 u8 start_action = tbl->action;
1566
1567 for (;;) {
c33104f0 1568 lq_sta->action_counter++;
b481de9c
ZY		 1569 switch (tbl->action) {
1570 case IWL_MIMO_SWITCH_ANTENNA_A:
1571 case IWL_MIMO_SWITCH_ANTENNA_B:
1572 IWL_DEBUG_HT("LQ: MIMO SWITCH TO SISO\n");
77626355 1573
0c11b4de 1574
77626355 1575 /* Set up new search table for SISO */
b481de9c
ZY		 1576 memcpy(search_tbl, tbl, sz);
1577 search_tbl->lq_type = LQ_SISO;
1578 search_tbl->is_SGI = 0;
1579 search_tbl->is_fat = 0;
1580 if (tbl->action == IWL_MIMO_SWITCH_ANTENNA_A)
1581 search_tbl->antenna_type = ANT_MAIN;
1582 else
1583 search_tbl->antenna_type = ANT_AUX;
1584
c33104f0 1585 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
270243a5 1586 search_tbl, index);
dc2453ae 1587 if (!ret) {
c33104f0 1588 lq_sta->search_better_tbl = 1;
b481de9c
ZY		 1589 goto out;
1590 }
1591 break;
1592
1593 case IWL_MIMO_SWITCH_GI:
1594 IWL_DEBUG_HT("LQ: MIMO SWITCH TO GI\n");
77626355
BC		 1595
1596 /* Set up new search table for MIMO */
b481de9c
ZY		 1597 memcpy(search_tbl, tbl, sz);
1598 search_tbl->lq_type = LQ_MIMO;
1599 search_tbl->antenna_type = ANT_BOTH;
1600 search_tbl->action = 0;
1601 if (search_tbl->is_SGI)
1602 search_tbl->is_SGI = 0;
1603 else
1604 search_tbl->is_SGI = 1;
c33104f0 1605 lq_sta->search_better_tbl = 1;
77626355
BC		 1606
1607 /*
1608 * If active table already uses the fastest possible
1609 * modulation (dual stream with short guard interval),
1610 * and it's working well, there's no need to look
1611 * for a better type of modulation!
1612 */
b481de9c
ZY		 1613 if ((tbl->lq_type == LQ_MIMO) &&
1614 (tbl->is_SGI)) {
c33104f0 1615 s32 tpt = lq_sta->last_tpt / 100;
b481de9c
ZY		 1616 if (((!tbl->is_fat) &&
1617 (tpt >= expected_tpt_mimo20MHz[index])) ||
1618 ((tbl->is_fat) &&
1619 (tpt >= expected_tpt_mimo40MHz[index])))
c33104f0 1620 lq_sta->search_better_tbl = 0;
b481de9c 1621 }
c33104f0 1622 rs_get_expected_tpt_table(lq_sta, search_tbl);
b481de9c
ZY		 1623 rs_mcs_from_tbl(&search_tbl->current_rate,
1624 search_tbl, index, is_green);
1625 goto out;
1626
1627 }
1628 tbl->action++;
1629 if (tbl->action > IWL_MIMO_SWITCH_GI)
1630 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1631
1632 if (tbl->action == start_action)
1633 break;
1634 }
1635
1636 return 0;
1637 out:
1638 tbl->action++;
1639 if (tbl->action > IWL_MIMO_SWITCH_GI)
1640 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1641 return 0;
1642
1643}
1644
77626355
BC		 1645/*
1646 * Check whether we should continue using same modulation mode, or
1647 * begin search for a new mode, based on:
1648 * 1) # tx successes or failures while using this mode
1649 * 2) # times calling this function
1650 * 3) elapsed time in this mode (not used, for now)
1651 */
c33104f0 1652static void rs_stay_in_table(struct iwl4965_lq_sta *lq_sta)
b481de9c 1653{
bb8c093b 1654 struct iwl4965_scale_tbl_info *tbl;
b481de9c
ZY		 1655 int i;
1656 int active_tbl;
1657 int flush_interval_passed = 0;
1658
c33104f0 1659 active_tbl = lq_sta->active_tbl;
b481de9c 1660
c33104f0 1661 tbl = &(lq_sta->lq_info[active_tbl]);
b481de9c 1662
77626355 1663 /* If we've been disallowing search, see if we should now allow it */
c33104f0 1664 if (lq_sta->stay_in_tbl) {
b481de9c 1665
77626355 1666 /* Elapsed time using current modulation mode */
c33104f0 1667 if (lq_sta->flush_timer)
b481de9c
ZY		 1668 flush_interval_passed =
1669 time_after(jiffies,
c33104f0 1670 (unsigned long)(lq_sta->flush_timer +
b481de9c
ZY		 1671 IWL_RATE_SCALE_FLUSH_INTVL));
1672
77626355 1673 /* For now, disable the elapsed time criterion */
b481de9c 1674 flush_interval_passed = 0;
77626355
BC		 1675
1676 /*
1677 * Check if we should allow search for new modulation mode.
1678 * If many frames have failed or succeeded, or we've used
1679 * this same modulation for a long time, allow search, and
1680 * reset history stats that keep track of whether we should
1681 * allow a new search. Also (below) reset all bitmaps and
1682 * stats in active history.
1683 */
c33104f0
TW		 1684 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1685 (lq_sta->total_success > lq_sta->max_success_limit) ||
1686 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
b481de9c
ZY		 1687 && (flush_interval_passed))) {
1688 IWL_DEBUG_HT("LQ: stay is expired %d %d %d\n:",
c33104f0
TW		 1689 lq_sta->total_failed,
1690 lq_sta->total_success,
b481de9c 1691 flush_interval_passed);
77626355
BC		 1692
1693 /* Allow search for new mode */
c33104f0
TW		 1694 lq_sta->stay_in_tbl = 0; /* only place reset */
1695 lq_sta->total_failed = 0;
1696 lq_sta->total_success = 0;
1697 lq_sta->flush_timer = 0;
77626355
BC		 1698
1699 /*
1700 * Else if we've used this modulation mode enough repetitions
1701 * (regardless of elapsed time or success/failure), reset
1702 * history bitmaps and rate-specific stats for all rates in
1703 * active table.
1704 */
403ab56b 1705 } else {
c33104f0
TW		 1706 lq_sta->table_count++;
1707 if (lq_sta->table_count >=
1708 lq_sta->table_count_limit) {
1709 lq_sta->table_count = 0;
b481de9c
ZY		 1710
1711 IWL_DEBUG_HT("LQ: stay in table clear win\n");
1712 for (i = 0; i < IWL_RATE_COUNT; i++)
1713 rs_rate_scale_clear_window(
1714 &(tbl->win[i]));
1715 }
1716 }
1717
77626355
BC		 1718 /* If transitioning to allow "search", reset all history
1719 * bitmaps and stats in active table (this will become the new
1720 * "search" table). */
c33104f0 1721 if (!lq_sta->stay_in_tbl) {
b481de9c
ZY		 1722 for (i = 0; i < IWL_RATE_COUNT; i++)
1723 rs_rate_scale_clear_window(&(tbl->win[i]));
1724 }
1725 }
1726}
1727
77626355
BC		 1728/*
1729 * Do rate scaling and search for new modulation mode.
1730 */
bb8c093b 1731static void rs_rate_scale_perform(struct iwl4965_priv *priv,
b481de9c
ZY		 1732 struct net_device *dev,
1733 struct ieee80211_hdr *hdr,
1734 struct sta_info *sta)
1735{
270243a5
RR		 1736 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1737 struct ieee80211_hw *hw = local_to_hw(local);
1738 struct ieee80211_conf *conf = &hw->conf;
b481de9c
ZY		 1739 int low = IWL_RATE_INVALID;
1740 int high = IWL_RATE_INVALID;
1741 int index;
1742 int i;
bb8c093b 1743 struct iwl4965_rate_scale_data *window = NULL;
b481de9c
ZY		 1744 int current_tpt = IWL_INVALID_VALUE;
1745 int low_tpt = IWL_INVALID_VALUE;
1746 int high_tpt = IWL_INVALID_VALUE;
1747 u32 fail_count;
1748 s8 scale_action = 0;
1749 u16 fc, rate_mask;
1750 u8 update_lq = 0;
c33104f0 1751 struct iwl4965_lq_sta *lq_sta;
bb8c093b 1752 struct iwl4965_scale_tbl_info *tbl, *tbl1;
b481de9c 1753 u16 rate_scale_index_msk = 0;
bb8c093b 1754 struct iwl4965_rate mcs_rate;
b481de9c
ZY		 1755 u8 is_green = 0;
1756 u8 active_tbl = 0;
1757 u8 done_search = 0;
1758 u16 high_low;
0c11b4de
RR		 1759#ifdef CONFIG_IWL4965_HT
1760 u8 tid = MAX_TID_COUNT;
1761 __le16 *qc;
1762#endif
b481de9c
ZY		 1763
1764 IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1765
1766 fc = le16_to_cpu(hdr->frame_control);
1767 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
1768 /* Send management frames and broadcast/multicast data using
1769 * lowest rate. */
1770 /* TODO: this could probably be improved.. */
1771 return;
1772 }
1773
1774 if (!sta || !sta->rate_ctrl_priv)
1775 return;
1776
1777 if (!priv->lq_mngr.lq_ready) {
1778 IWL_DEBUG_RATE("still rate scaling not ready\n");
1779 return;
1780 }
c33104f0 1781 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
b481de9c 1782
0c11b4de
RR		 1783#ifdef CONFIG_IWL4965_HT
1784 qc = ieee80211_get_qos_ctrl(hdr);
1785 if (qc) {
1786 tid = (u8)(le16_to_cpu(*qc) & 0xf);
1787 rs_tl_add_packet(lq_sta, tid);
1788 }
1789#endif
77626355
BC		 1790 /*
1791 * Select rate-scale / modulation-mode table to work with in
1792 * the rest of this function: "search" if searching for better
1793 * modulation mode, or "active" if doing rate scaling within a mode.
1794 */
c33104f0
TW		 1795 if (!lq_sta->search_better_tbl)
1796 active_tbl = lq_sta->active_tbl;
b481de9c 1797 else
c33104f0 1798 active_tbl = 1 - lq_sta->active_tbl;
b481de9c 1799
c33104f0
TW		 1800 tbl = &(lq_sta->lq_info[active_tbl]);
1801 is_green = lq_sta->is_green;
b481de9c 1802
77626355 1803 /* current tx rate */
8318d78a 1804 index = sta->last_txrate_idx;
b481de9c
ZY		 1805
1806 IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1807 tbl->lq_type);
1808
77626355 1809 /* rates available for this association, and for modulation mode */
c33104f0 1810 rs_get_supported_rates(lq_sta, hdr, tbl->lq_type,
b481de9c
ZY		 1811 &rate_mask);
1812
1813 IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1814
1815 /* mask with station rate restriction */
1816 if (is_legacy(tbl->lq_type)) {
8318d78a 1817 if (lq_sta->band == IEEE80211_BAND_5GHZ)
77626355 1818 /* supp_rates has no CCK bits in A mode */
b481de9c 1819 rate_scale_index_msk = (u16) (rate_mask &
c33104f0 1820 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
b481de9c
ZY		 1821 else
1822 rate_scale_index_msk = (u16) (rate_mask &
c33104f0 1823 lq_sta->supp_rates);
b481de9c
ZY		 1824
1825 } else
1826 rate_scale_index_msk = rate_mask;
1827
1828 if (!rate_scale_index_msk)
1829 rate_scale_index_msk = rate_mask;
1830
77626355
BC		 1831 /* If current rate is no longer supported on current association,
1832 * or user changed preferences for rates, find a new supported rate. */
b481de9c
ZY		 1833 if (index < 0 || !((1 << index) & rate_scale_index_msk)) {
1834 index = IWL_INVALID_VALUE;
1835 update_lq = 1;
1836
77626355 1837 /* get the highest available rate */
b481de9c
ZY		 1838 for (i = 0; i <= IWL_RATE_COUNT; i++) {
1839 if ((1 << i) & rate_scale_index_msk)
1840 index = i;
1841 }
1842
1843 if (index == IWL_INVALID_VALUE) {
1844 IWL_WARNING("Can not find a suitable rate\n");
1845 return;
1846 }
1847 }
1848
77626355 1849 /* Get expected throughput table and history window for current rate */
b481de9c 1850 if (!tbl->expected_tpt)
c33104f0 1851 rs_get_expected_tpt_table(lq_sta, tbl);
b481de9c
ZY		 1852
1853 window = &(tbl->win[index]);
1854
77626355
BC		 1855 /*
1856 * If there is not enough history to calculate actual average
1857 * throughput, keep analyzing results of more tx frames, without
1858 * changing rate or mode (bypass most of the rest of this function).
1859 * Set up new rate table in uCode only if old rate is not supported
1860 * in current association (use new rate found above).
1861 */
b481de9c
ZY		 1862 fail_count = window->counter - window->success_counter;
1863 if (((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1864 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH))
1865 || (tbl->expected_tpt == NULL)) {
1866 IWL_DEBUG_RATE("LQ: still below TH succ %d total %d "
1867 "for index %d\n",
1868 window->success_counter, window->counter, index);
77626355
BC		 1869
1870 /* Can't calculate this yet; not enough history */
b481de9c 1871 window->average_tpt = IWL_INVALID_VALUE;
77626355
BC		 1872
1873 /* Should we stay with this modulation mode,
1874 * or search for a new one? */
c33104f0 1875 rs_stay_in_table(lq_sta);
77626355
BC		 1876
1877 /* Set up new rate table in uCode, if needed */
b481de9c
ZY		 1878 if (update_lq) {
1879 rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green);
c33104f0
TW		 1880 rs_fill_link_cmd(lq_sta, &mcs_rate, &lq_sta->lq);
1881 rs_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
b481de9c
ZY		 1882 }
1883 goto out;
1884
77626355
BC		 1885 /* Else we have enough samples; calculate estimate of
1886 * actual average throughput */
b481de9c
ZY		 1887 } else
1888 window->average_tpt = ((window->success_ratio *
1889 tbl->expected_tpt[index] + 64) / 128);
1890
77626355 1891 /* If we are searching for better modulation mode, check success. */
c33104f0 1892 if (lq_sta->search_better_tbl) {
b481de9c
ZY		 1893 int success_limit = IWL_RATE_SCALE_SWITCH;
1894
77626355
BC		 1895 /* If good success, continue using the "search" mode;
1896 * no need to send new link quality command, since we're
1897 * continuing to use the setup that we've been trying. */
b481de9c 1898 if ((window->success_ratio > success_limit) ||
c33104f0 1899 (window->average_tpt > lq_sta->last_tpt)) {
b481de9c
ZY		 1900 if (!is_legacy(tbl->lq_type)) {
1901 IWL_DEBUG_HT("LQ: we are switching to HT"
1902 " rate suc %d current tpt %d"
1903 " old tpt %d\n",
1904 window->success_ratio,
1905 window->average_tpt,
c33104f0
TW		 1906 lq_sta->last_tpt);
1907 lq_sta->enable_counter = 1;
b481de9c 1908 }
77626355 1909 /* Swap tables; "search" becomes "active" */
c33104f0 1910 lq_sta->active_tbl = active_tbl;
b481de9c 1911 current_tpt = window->average_tpt;
77626355
BC		 1912
1913 /* Else poor success; go back to mode in "active" table */
b481de9c 1914 } else {
77626355 1915 /* Nullify "search" table */
b481de9c 1916 tbl->lq_type = LQ_NONE;
77626355
BC		 1917
1918 /* Revert to "active" table */
c33104f0
TW		 1919 active_tbl = lq_sta->active_tbl;
1920 tbl = &(lq_sta->lq_info[active_tbl]);
b481de9c 1921
77626355 1922 /* Revert to "active" rate and throughput info */
17744ff6 1923 index = iwl4965_hwrate_to_plcp_idx(
b481de9c 1924 tbl->current_rate.rate_n_flags);
c33104f0 1925 current_tpt = lq_sta->last_tpt;
b481de9c 1926
77626355 1927 /* Need to set up a new rate table in uCode */
b481de9c 1928 update_lq = 1;
b481de9c
ZY		 1929 IWL_DEBUG_HT("XXY GO BACK TO OLD TABLE\n");
1930 }
77626355
BC		 1931
1932 /* Either way, we've made a decision; modulation mode
1933 * search is done, allow rate adjustment next time. */
c33104f0 1934 lq_sta->search_better_tbl = 0;
77626355 1935 done_search = 1; /* Don't switch modes below! */
b481de9c
ZY		 1936 goto lq_update;
1937 }
1938
77626355
BC		 1939 /* (Else) not in search of better modulation mode, try for better
1940 * starting rate, while staying in this mode. */
b481de9c
ZY		 1941 high_low = rs_get_adjacent_rate(index, rate_scale_index_msk,
1942 tbl->lq_type);
1943 low = high_low & 0xff;
1944 high = (high_low >> 8) & 0xff;
1945
77626355 1946 /* Collect measured throughputs for current and adjacent rates */
b481de9c 1947 current_tpt = window->average_tpt;
b481de9c
ZY		 1948 if (low != IWL_RATE_INVALID)
1949 low_tpt = tbl->win[low].average_tpt;
b481de9c
ZY		 1950 if (high != IWL_RATE_INVALID)
1951 high_tpt = tbl->win[high].average_tpt;
1952
77626355 1953 /* Assume rate increase */
b481de9c
ZY		 1954 scale_action = 1;
1955
77626355 1956 /* Too many failures, decrease rate */
b481de9c
ZY		 1957 if ((window->success_ratio <= IWL_RATE_DECREASE_TH) ||
1958 (current_tpt == 0)) {
1959 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1960 scale_action = -1;
77626355
BC		 1961
1962 /* No throughput measured yet for adjacent rates; try increase. */
b481de9c
ZY		 1963 } else if ((low_tpt == IWL_INVALID_VALUE) &&
1964 (high_tpt == IWL_INVALID_VALUE))
1965 scale_action = 1;
77626355
BC		 1966
1967 /* Both adjacent throughputs are measured, but neither one has better
1968 * throughput; we're using the best rate, don't change it! */
b481de9c
ZY		 1969 else if ((low_tpt != IWL_INVALID_VALUE) &&
1970 (high_tpt != IWL_INVALID_VALUE) &&
1971 (low_tpt < current_tpt) &&
1972 (high_tpt < current_tpt))
1973 scale_action = 0;
77626355
BC		 1974
1975 /* At least one adjacent rate's throughput is measured,
1976 * and may have better performance. */
b481de9c 1977 else {
77626355 1978 /* Higher adjacent rate's throughput is measured */
b481de9c 1979 if (high_tpt != IWL_INVALID_VALUE) {
77626355 1980 /* Higher rate has better throughput */
b481de9c
ZY		 1981 if (high_tpt > current_tpt)
1982 scale_action = 1;
1983 else {
1984 IWL_DEBUG_RATE
1985 ("decrease rate because of high tpt\n");
1986 scale_action = -1;
1987 }
77626355
BC		 1988
1989 /* Lower adjacent rate's throughput is measured */
b481de9c 1990 } else if (low_tpt != IWL_INVALID_VALUE) {
77626355 1991 /* Lower rate has better throughput */
b481de9c
ZY		 1992 if (low_tpt > current_tpt) {
1993 IWL_DEBUG_RATE
1994 ("decrease rate because of low tpt\n");
1995 scale_action = -1;
1996 } else
1997 scale_action = 1;
1998 }
1999 }
2000
77626355
BC		 2001 /* Sanity check; asked for decrease, but success rate or throughput
2002 * has been good at old rate. Don't change it. */
b481de9c
ZY		 2003 if (scale_action == -1) {
2004 if ((low != IWL_RATE_INVALID) &&
2005 ((window->success_ratio > IWL_RATE_HIGH_TH) ||
2006 (current_tpt > (100 * tbl->expected_tpt[low]))))
2007 scale_action = 0;
77626355
BC		 2008
2009 /* Sanity check; asked for increase, but success rate has not been great
2010 * even at old rate, higher rate will be worse. Don't change it. */
b481de9c
ZY		 2011 } else if ((scale_action == 1) &&
2012 (window->success_ratio < IWL_RATE_INCREASE_TH))
2013 scale_action = 0;
2014
2015 switch (scale_action) {
2016 case -1:
77626355 2017 /* Decrease starting rate, update uCode's rate table */
b481de9c
ZY		 2018 if (low != IWL_RATE_INVALID) {
2019 update_lq = 1;
2020 index = low;
2021 }
2022 break;
2023 case 1:
77626355 2024 /* Increase starting rate, update uCode's rate table */
b481de9c
ZY		 2025 if (high != IWL_RATE_INVALID) {
2026 update_lq = 1;
2027 index = high;
2028 }
2029
2030 break;
2031 case 0:
77626355 2032 /* No change */
b481de9c
ZY		 2033 default:
2034 break;
2035 }
2036
2037 IWL_DEBUG_HT("choose rate scale index %d action %d low %d "
2038 "high %d type %d\n",
2039 index, scale_action, low, high, tbl->lq_type);
2040
2041 lq_update:
77626355 2042 /* Replace uCode's rate table for the destination station. */
b481de9c
ZY		 2043 if (update_lq) {
2044 rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green);
c33104f0
TW		 2045 rs_fill_link_cmd(lq_sta, &mcs_rate, &lq_sta->lq);
2046 rs_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
b481de9c 2047 }
77626355
BC		 2048
2049 /* Should we stay with this modulation mode, or search for a new one? */
c33104f0 2050 rs_stay_in_table(lq_sta);
b481de9c 2051
77626355
BC		 2052 /*
2053 * Search for new modulation mode if we're:
2054 * 1) Not changing rates right now
2055 * 2) Not just finishing up a search
2056 * 3) Allowing a new search
2057 */
c33104f0 2058 if (!update_lq && !done_search && !lq_sta->stay_in_tbl) {
77626355 2059 /* Save current throughput to compare with "search" throughput*/
c33104f0 2060 lq_sta->last_tpt = current_tpt;
b481de9c 2061
77626355
BC		 2062 /* Select a new "search" modulation mode to try.
2063 * If one is found, set up the new "search" table. */
b481de9c 2064 if (is_legacy(tbl->lq_type))
c33104f0 2065 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
b481de9c 2066 else if (is_siso(tbl->lq_type))
c33104f0 2067 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
b481de9c 2068 else
c33104f0 2069 rs_move_mimo_to_other(priv, lq_sta, conf, sta, index);
b481de9c 2070
77626355 2071 /* If new "search" mode was selected, set up in uCode table */
c33104f0 2072 if (lq_sta->search_better_tbl) {
77626355 2073 /* Access the "search" table, clear its history. */
c33104f0 2074 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
b481de9c
ZY		 2075 for (i = 0; i < IWL_RATE_COUNT; i++)
2076 rs_rate_scale_clear_window(&(tbl->win[i]));
2077
77626355 2078 /* Use new "search" start rate */
17744ff6 2079 index = iwl4965_hwrate_to_plcp_idx(
b481de9c
ZY		 2080 tbl->current_rate.rate_n_flags);
2081
2082 IWL_DEBUG_HT("Switch current mcs: %X index: %d\n",
2083 tbl->current_rate.rate_n_flags, index);
c33104f0
TW		 2084 rs_fill_link_cmd(lq_sta, &tbl->current_rate,
2085 &lq_sta->lq);
2086 rs_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
b481de9c 2087 }
b481de9c 2088
77626355
BC		 2089 /* If the "active" (non-search) mode was legacy,
2090 * and we've tried switching antennas,
2091 * but we haven't been able to try HT modes (not available),
2092 * stay with best antenna legacy modulation for a while
2093 * before next round of mode comparisons. */
c33104f0 2094 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
b481de9c 2095 if (is_legacy(tbl1->lq_type) &&
c8b0e6e1 2096#ifdef CONFIG_IWL4965_HT
270243a5 2097 (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)) &&
b481de9c 2098#endif
c33104f0
TW		 2099 (lq_sta->action_counter >= 1)) {
2100 lq_sta->action_counter = 0;
b481de9c 2101 IWL_DEBUG_HT("LQ: STAY in legacy table\n");
c33104f0 2102 rs_set_stay_in_table(1, lq_sta);
b481de9c
ZY		 2103 }
2104
77626355
BC		 2105 /* If we're in an HT mode, and all 3 mode switch actions
2106 * have been tried and compared, stay in this best modulation
2107 * mode for a while before next round of mode comparisons. */
c33104f0
TW		 2108 if (lq_sta->enable_counter &&
2109 (lq_sta->action_counter >= IWL_ACTION_LIMIT)) {
0c11b4de
RR		 2110#ifdef CONFIG_IWL4965_HT
2111 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2112 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2113 (tid != MAX_TID_COUNT)) {
2114 IWL_DEBUG_HT("try to aggregate tid %d\n", tid);
2115 rs_tl_turn_on_agg(priv, tid, lq_sta, sta);
b481de9c 2116 }
0c11b4de 2117#endif /*CONFIG_IWL4965_HT */
c33104f0
TW		 2118 lq_sta->action_counter = 0;
2119 rs_set_stay_in_table(0, lq_sta);
b481de9c 2120 }
77626355
BC		 2121
2122 /*
2123 * Else, don't search for a new modulation mode.
2124 * Put new timestamp in stay-in-modulation-mode flush timer if:
2125 * 1) Not changing rates right now
2126 * 2) Not just finishing up a search
2127 * 3) flush timer is empty
2128 */
b481de9c 2129 } else {
c33104f0
TW		 2130 if ((!update_lq) && (!done_search) && (!lq_sta->flush_timer))
2131 lq_sta->flush_timer = jiffies;
b481de9c
ZY		 2132 }
2133
2134out:
2135 rs_mcs_from_tbl(&tbl->current_rate, tbl, index, is_green);
2136 i = index;
8318d78a 2137 sta->last_txrate_idx = i;
b481de9c 2138
8318d78a 2139 /* sta->txrate_idx is an index to A mode rates which start
b481de9c
ZY		 2140 * at IWL_FIRST_OFDM_RATE
2141 */
8318d78a
JB		 2142 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2143 sta->txrate_idx = i - IWL_FIRST_OFDM_RATE;
b481de9c 2144 else
8318d78a 2145 sta->txrate_idx = i;
b481de9c
ZY		 2146
2147 return;
2148}
2149
2150
bb8c093b 2151static void rs_initialize_lq(struct iwl4965_priv *priv,
270243a5 2152 struct ieee80211_conf *conf,
b481de9c
ZY		 2153 struct sta_info *sta)
2154{
2155 int i;
c33104f0 2156 struct iwl4965_lq_sta *lq_sta;
bb8c093b 2157 struct iwl4965_scale_tbl_info *tbl;
b481de9c
ZY		 2158 u8 active_tbl = 0;
2159 int rate_idx;
270243a5 2160 u8 use_green = rs_use_green(priv, conf);
bb8c093b 2161 struct iwl4965_rate mcs_rate;
b481de9c
ZY		 2162
2163 if (!sta || !sta->rate_ctrl_priv)
2164 goto out;
2165
c33104f0 2166 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
8318d78a 2167 i = sta->last_txrate_idx;
b481de9c 2168
c33104f0 2169 if ((lq_sta->lq.sta_id == 0xff) &&
b481de9c
ZY		 2170 (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
2171 goto out;
2172
c33104f0
TW		 2173 if (!lq_sta->search_better_tbl)
2174 active_tbl = lq_sta->active_tbl;
b481de9c 2175 else
c33104f0 2176 active_tbl = 1 - lq_sta->active_tbl;
b481de9c 2177
c33104f0 2178 tbl = &(lq_sta->lq_info[active_tbl]);
b481de9c
ZY		 2179
2180 if ((i < 0) || (i >= IWL_RATE_COUNT))
2181 i = 0;
2182
bb8c093b 2183 mcs_rate.rate_n_flags = iwl4965_rates[i].plcp ;
b481de9c
ZY		 2184 mcs_rate.rate_n_flags |= RATE_MCS_ANT_B_MSK;
2185 mcs_rate.rate_n_flags &= ~RATE_MCS_ANT_A_MSK;
2186
2187 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2188 mcs_rate.rate_n_flags |= RATE_MCS_CCK_MSK;
2189
2190 tbl->antenna_type = ANT_AUX;
8318d78a 2191 rs_get_tbl_info_from_mcs(&mcs_rate, priv->band, tbl, &rate_idx);
b481de9c 2192 if (!rs_is_ant_connected(priv->valid_antenna, tbl->antenna_type))
46640a8c 2193 rs_toggle_antenna(&mcs_rate, tbl);
b481de9c
ZY		 2194
2195 rs_mcs_from_tbl(&mcs_rate, tbl, rate_idx, use_green);
2196 tbl->current_rate.rate_n_flags = mcs_rate.rate_n_flags;
c33104f0
TW		 2197 rs_get_expected_tpt_table(lq_sta, tbl);
2198 rs_fill_link_cmd(lq_sta, &mcs_rate, &lq_sta->lq);
2199 rs_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
b481de9c
ZY		 2200 out:
2201 return;
2202}
2203
1abbe498 2204static void rs_get_rate(void *priv_rate, struct net_device *dev,
8318d78a
JB		 2205 struct ieee80211_supported_band *sband,
2206 struct sk_buff *skb,
1abbe498 2207 struct rate_selection *sel)
b481de9c
ZY		 2208{
2209
2210 int i;
2211 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
270243a5 2212 struct ieee80211_conf *conf = &local->hw.conf;
b481de9c
ZY		 2213 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2214 struct sta_info *sta;
2bc454b0 2215 u16 fc;
bb8c093b 2216 struct iwl4965_priv *priv = (struct iwl4965_priv *)priv_rate;
c33104f0 2217 struct iwl4965_lq_sta *lq_sta;
b481de9c 2218
58826351 2219 IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
b481de9c 2220
d0709a65
JB		 2221 rcu_read_lock();
2222
b481de9c
ZY		 2223 sta = sta_info_get(local, hdr->addr1);
2224
2bc454b0
MW		 2225 /* Send management frames and broadcast/multicast data using lowest
2226 * rate. */
2227 fc = le16_to_cpu(hdr->frame_control);
2228 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1) ||
2229 !sta || !sta->rate_ctrl_priv) {
8318d78a 2230 sel->rate = rate_lowest(local, sband, sta);
f4d6082d 2231 goto out;
b481de9c
ZY		 2232 }
2233
c33104f0 2234 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
8318d78a 2235 i = sta->last_txrate_idx;
b481de9c 2236
c33104f0
TW		 2237 if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
2238 !lq_sta->ibss_sta_added) {
bb8c093b 2239 u8 sta_id = iwl4965_hw_find_station(priv, hdr->addr1);
0795af57 2240 DECLARE_MAC_BUF(mac);
b481de9c
ZY		 2241
2242 if (sta_id == IWL_INVALID_STATION) {
0795af57
JP		 2243 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2244 print_mac(mac, hdr->addr1));
67d62035
RR		 2245 sta_id = iwl4965_add_station_flags(priv, hdr->addr1,
2246 0, CMD_ASYNC, NULL);
b481de9c
ZY		 2247 }
2248 if ((sta_id != IWL_INVALID_STATION)) {
c33104f0
TW		 2249 lq_sta->lq.sta_id = sta_id;
2250 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2251 lq_sta->ibss_sta_added = 1;
270243a5 2252 rs_initialize_lq(priv, conf, sta);
b481de9c 2253 }
c33104f0 2254 if (!lq_sta->ibss_sta_added)
b481de9c
ZY		 2255 goto done;
2256 }
2257
f4d6082d 2258done:
1abbe498 2259 if ((i < 0) || (i > IWL_RATE_COUNT)) {
8318d78a 2260 sel->rate = rate_lowest(local, sband, sta);
f4d6082d 2261 goto out;
1abbe498 2262 }
b481de9c 2263
1abbe498 2264 sel->rate = &priv->ieee_rates[i];
f4d6082d
TW		 2265out:
2266 rcu_read_unlock();
b481de9c
ZY		 2267}
2268
2269static void *rs_alloc_sta(void *priv, gfp_t gfp)
2270{
c33104f0 2271 struct iwl4965_lq_sta *lq_sta;
b481de9c
ZY		 2272 int i, j;
2273
2274 IWL_DEBUG_RATE("create station rate scale window\n");
2275
c33104f0 2276 lq_sta = kzalloc(sizeof(struct iwl4965_lq_sta), gfp);
b481de9c 2277
c33104f0 2278 if (lq_sta == NULL)
b481de9c 2279 return NULL;
c33104f0 2280 lq_sta->lq.sta_id = 0xff;
b481de9c 2281
63fddb9f 2282
b481de9c
ZY		 2283 for (j = 0; j < LQ_SIZE; j++)
2284 for (i = 0; i < IWL_RATE_COUNT; i++)
c33104f0 2285 rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
b481de9c 2286
c33104f0 2287 return lq_sta;
b481de9c
ZY		 2288}
2289
2290static void rs_rate_init(void *priv_rate, void *priv_sta,
2291 struct ieee80211_local *local,
2292 struct sta_info *sta)
2293{
2294 int i, j;
270243a5 2295 struct ieee80211_conf *conf = &local->hw.conf;
8318d78a 2296 struct ieee80211_supported_band *sband;
bb8c093b 2297 struct iwl4965_priv *priv = (struct iwl4965_priv *)priv_rate;
c33104f0 2298 struct iwl4965_lq_sta *lq_sta = priv_sta;
b481de9c 2299
8318d78a
JB		 2300 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2301
c33104f0 2302 lq_sta->flush_timer = 0;
8318d78a
JB		 2303 lq_sta->supp_rates = sta->supp_rates[sband->band];
2304 sta->txrate_idx = 3;
b481de9c
ZY		 2305 for (j = 0; j < LQ_SIZE; j++)
2306 for (i = 0; i < IWL_RATE_COUNT; i++)
c33104f0 2307 rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
b481de9c
ZY		 2308
2309 IWL_DEBUG_RATE("rate scale global init\n");
2310 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2311 * the lowest or the highest rate.. Could consider using RSSI from
2312 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2313 * after assoc.. */
2314
c33104f0 2315 lq_sta->ibss_sta_added = 0;
b481de9c 2316 if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
bb8c093b 2317 u8 sta_id = iwl4965_hw_find_station(priv, sta->addr);
0795af57
JP		 2318 DECLARE_MAC_BUF(mac);
2319
b481de9c 2320 /* for IBSS the call are from tasklet */
0795af57
JP		 2321 IWL_DEBUG_HT("LQ: ADD station %s\n",
2322 print_mac(mac, sta->addr));
b481de9c
ZY		 2323
2324 if (sta_id == IWL_INVALID_STATION) {
0795af57
JP		 2325 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2326 print_mac(mac, sta->addr));
67d62035
RR		 2327 sta_id = iwl4965_add_station_flags(priv, sta->addr,
2328 0, CMD_ASYNC, NULL);
b481de9c
ZY		 2329 }
2330 if ((sta_id != IWL_INVALID_STATION)) {
c33104f0
TW		 2331 lq_sta->lq.sta_id = sta_id;
2332 lq_sta->lq.rs_table[0].rate_n_flags = 0;
b481de9c
ZY		 2333 }
2334 /* FIXME: this is w/a remove it later */
2335 priv->assoc_station_added = 1;
2336 }
2337
77626355 2338 /* Find highest tx rate supported by hardware and destination station */
8318d78a
JB		 2339 for (i = 0; i < sband->n_bitrates; i++)
2340 if (sta->supp_rates[sband->band] & BIT(i))
2341 sta->txrate_idx = i;
2342
2343 sta->last_txrate_idx = sta->txrate_idx;
2344 /* WTF is with this bogus comment? A doesn't have cck rates */
77626355 2345 /* For MODE_IEEE80211A, cck rates are at end of rate table */
8318d78a
JB		 2346 if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
2347 sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
b481de9c 2348
c33104f0
TW		 2349 lq_sta->is_dup = 0;
2350 lq_sta->valid_antenna = priv->valid_antenna;
2351 lq_sta->antenna = priv->antenna;
2352 lq_sta->is_green = rs_use_green(priv, conf);
2353 lq_sta->active_rate = priv->active_rate;
2354 lq_sta->active_rate &= ~(0x1000);
2355 lq_sta->active_rate_basic = priv->active_rate_basic;
8318d78a 2356 lq_sta->band = priv->band;
c8b0e6e1 2357#ifdef CONFIG_IWL4965_HT
77626355
BC		 2358 /*
2359 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2360 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2361 */
c33104f0
TW		 2362 lq_sta->active_siso_rate = (priv->current_ht_config.supp_mcs_set[0] << 1);
2363 lq_sta->active_siso_rate |=
270243a5 2364 (priv->current_ht_config.supp_mcs_set[0] & 0x1);
c33104f0
TW		 2365 lq_sta->active_siso_rate &= ~((u16)0x2);
2366 lq_sta->active_siso_rate =
2367 lq_sta->active_siso_rate << IWL_FIRST_OFDM_RATE;
b481de9c 2368
77626355 2369 /* Same here */
c33104f0
TW		 2370 lq_sta->active_mimo_rate = (priv->current_ht_config.supp_mcs_set[1] << 1);
2371 lq_sta->active_mimo_rate |=
270243a5 2372 (priv->current_ht_config.supp_mcs_set[1] & 0x1);
c33104f0
TW		 2373 lq_sta->active_mimo_rate &= ~((u16)0x2);
2374 lq_sta->active_mimo_rate =
2375 lq_sta->active_mimo_rate << IWL_FIRST_OFDM_RATE;
2376 IWL_DEBUG_HT("SISO RATE 0x%X MIMO RATE 0x%X\n",
2377 lq_sta->active_siso_rate,
2378 lq_sta->active_mimo_rate);
0c11b4de
RR		 2379 /* as default allow aggregation for all tids */
2380 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
c8b0e6e1 2381#endif /*CONFIG_IWL4965_HT*/
98d7e09a 2382#ifdef CONFIG_MAC80211_DEBUGFS
c33104f0 2383 lq_sta->drv = priv;
98d7e09a 2384#endif
b481de9c
ZY		 2385
2386 if (priv->assoc_station_added)
2387 priv->lq_mngr.lq_ready = 1;
2388
270243a5 2389 rs_initialize_lq(priv, conf, sta);
b481de9c
ZY		 2390}
2391
c33104f0 2392static void rs_fill_link_cmd(struct iwl4965_lq_sta *lq_sta,
bb8c093b
CH		 2393 struct iwl4965_rate *tx_mcs,
2394 struct iwl4965_link_quality_cmd *lq_cmd)
b481de9c
ZY		 2395{
2396 int index = 0;
b481de9c 2397 int rate_idx;
1b696de2 2398 int repeat_rate = 0;
b481de9c
ZY		 2399 u8 ant_toggle_count = 0;
2400 u8 use_ht_possible = 1;
bb8c093b
CH		 2401 struct iwl4965_rate new_rate;
2402 struct iwl4965_scale_tbl_info tbl_type = { 0 };
b481de9c 2403
77626355 2404 /* Override starting rate (index 0) if needed for debug purposes */
c33104f0 2405 rs_dbgfs_set_mcs(lq_sta, tx_mcs, index);
98d7e09a 2406
77626355 2407 /* Interpret rate_n_flags */
8318d78a 2408 rs_get_tbl_info_from_mcs(tx_mcs, lq_sta->band,
b481de9c
ZY		 2409 &tbl_type, &rate_idx);
2410
77626355 2411 /* How many times should we repeat the initial rate? */
b481de9c
ZY		 2412 if (is_legacy(tbl_type.lq_type)) {
2413 ant_toggle_count = 1;
1b696de2 2414 repeat_rate = IWL_NUMBER_TRY;
b481de9c 2415 } else
1b696de2 2416 repeat_rate = IWL_HT_NUMBER_TRY;
b481de9c
ZY		 2417
2418 lq_cmd->general_params.mimo_delimiter =
2419 is_mimo(tbl_type.lq_type) ? 1 : 0;
77626355
BC		 2420
2421 /* Fill 1st table entry (index 0) */
b481de9c
ZY		 2422 lq_cmd->rs_table[index].rate_n_flags =
2423 cpu_to_le32(tx_mcs->rate_n_flags);
2424 new_rate.rate_n_flags = tx_mcs->rate_n_flags;
2425
2426 if (is_mimo(tbl_type.lq_type) || (tbl_type.antenna_type == ANT_MAIN))
77626355
BC		 2427 lq_cmd->general_params.single_stream_ant_msk
2428 = LINK_QUAL_ANT_A_MSK;
b481de9c 2429 else
77626355
BC		 2430 lq_cmd->general_params.single_stream_ant_msk
2431 = LINK_QUAL_ANT_B_MSK;
b481de9c
ZY		 2432
2433 index++;
1b696de2 2434 repeat_rate--;
b481de9c 2435
77626355 2436 /* Fill rest of rate table */
b481de9c 2437 while (index < LINK_QUAL_MAX_RETRY_NUM) {
77626355
BC		 2438 /* Repeat initial/next rate.
2439 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2440 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
1b696de2 2441 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
b481de9c
ZY		 2442 if (is_legacy(tbl_type.lq_type)) {
2443 if (ant_toggle_count <
2444 NUM_TRY_BEFORE_ANTENNA_TOGGLE)
2445 ant_toggle_count++;
2446 else {
2447 rs_toggle_antenna(&new_rate, &tbl_type);
2448 ant_toggle_count = 1;
2449 }
2450 }
98d7e09a 2451
77626355 2452 /* Override next rate if needed for debug purposes */
c33104f0 2453 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
77626355
BC		 2454
2455 /* Fill next table entry */
b481de9c
ZY		 2456 lq_cmd->rs_table[index].rate_n_flags =
2457 cpu_to_le32(new_rate.rate_n_flags);
1b696de2 2458 repeat_rate--;
b481de9c
ZY		 2459 index++;
2460 }
2461
8318d78a 2462 rs_get_tbl_info_from_mcs(&new_rate, lq_sta->band, &tbl_type,
b481de9c
ZY		 2463 &rate_idx);
2464
77626355
BC		 2465 /* Indicate to uCode which entries might be MIMO.
2466 * If initial rate was MIMO, this will finally end up
2467 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
b481de9c
ZY		 2468 if (is_mimo(tbl_type.lq_type))
2469 lq_cmd->general_params.mimo_delimiter = index;
2470
77626355 2471 /* Get next rate */
c33104f0 2472 rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
02dede04 2473 use_ht_possible, &new_rate);
b481de9c 2474
77626355 2475 /* How many times should we repeat the next rate? */
b481de9c
ZY		 2476 if (is_legacy(tbl_type.lq_type)) {
2477 if (ant_toggle_count < NUM_TRY_BEFORE_ANTENNA_TOGGLE)
2478 ant_toggle_count++;
2479 else {
2480 rs_toggle_antenna(&new_rate, &tbl_type);
2481 ant_toggle_count = 1;
2482 }
1b696de2 2483 repeat_rate = IWL_NUMBER_TRY;
b481de9c 2484 } else
1b696de2 2485 repeat_rate = IWL_HT_NUMBER_TRY;
b481de9c 2486
77626355
BC		 2487 /* Don't allow HT rates after next pass.
2488 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
b481de9c
ZY		 2489 use_ht_possible = 0;
2490
77626355 2491 /* Override next rate if needed for debug purposes */
c33104f0 2492 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
77626355
BC		 2493
2494 /* Fill next table entry */
b481de9c
ZY		 2495 lq_cmd->rs_table[index].rate_n_flags =
2496 cpu_to_le32(new_rate.rate_n_flags);
b481de9c
ZY		 2497
2498 index++;
1b696de2 2499 repeat_rate--;
b481de9c
ZY		 2500 }
2501
b481de9c
ZY		 2502 lq_cmd->general_params.dual_stream_ant_msk = 3;
2503 lq_cmd->agg_params.agg_dis_start_th = 3;
2504 lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
b481de9c
ZY		 2505}
2506
2507static void *rs_alloc(struct ieee80211_local *local)
2508{
2509 return local->hw.priv;
2510}
2511/* rate scale requires free function to be implemented */
2512static void rs_free(void *priv_rate)
2513{
2514 return;
2515}
2516
2517static void rs_clear(void *priv_rate)
2518{
bb8c093b 2519 struct iwl4965_priv *priv = (struct iwl4965_priv *) priv_rate;
b481de9c
ZY		 2520
2521 IWL_DEBUG_RATE("enter\n");
2522
2523 priv->lq_mngr.lq_ready = 0;
b481de9c
ZY		 2524
2525 IWL_DEBUG_RATE("leave\n");
2526}
2527
2528static void rs_free_sta(void *priv, void *priv_sta)
2529{
c33104f0 2530 struct iwl4965_lq_sta *lq_sta = priv_sta;
b481de9c
ZY		 2531
2532 IWL_DEBUG_RATE("enter\n");
c33104f0 2533 kfree(lq_sta);
b481de9c
ZY		 2534 IWL_DEBUG_RATE("leave\n");
2535}
2536
2537
93dc646a 2538#ifdef CONFIG_MAC80211_DEBUGFS
5ae212c9
ZY		 2539static int open_file_generic(struct inode *inode, struct file *file)
2540{
2541 file->private_data = inode->i_private;
2542 return 0;
2543}
c33104f0 2544static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
bb8c093b 2545 struct iwl4965_rate *mcs, int index)
98d7e09a 2546{
4457e1a4
RR		 2547 u32 base_rate;
2548
8318d78a 2549 if (lq_sta->band == IEEE80211_BAND_5GHZ)
4457e1a4
RR		 2550 base_rate = 0x800D;
2551 else
2552 base_rate = 0x820A;
2553
c33104f0 2554 if (lq_sta->dbg_fixed.rate_n_flags) {
98d7e09a 2555 if (index < 12)
c33104f0 2556 mcs->rate_n_flags = lq_sta->dbg_fixed.rate_n_flags;
98d7e09a 2557 else
4457e1a4 2558 mcs->rate_n_flags = base_rate;
98d7e09a
ZY		 2559 IWL_DEBUG_RATE("Fixed rate ON\n");
2560 return;
2561 }
2562
2563 IWL_DEBUG_RATE("Fixed rate OFF\n");
2564}
5ae212c9 2565
98d7e09a
ZY		 2566static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2567 const char __user *user_buf, size_t count, loff_t *ppos)
2568{
c33104f0 2569 struct iwl4965_lq_sta *lq_sta = file->private_data;
98d7e09a
ZY		 2570 char buf[64];
2571 int buf_size;
2572 u32 parsed_rate;
2573
2574 memset(buf, 0, sizeof(buf));
2575 buf_size = min(count, sizeof(buf) - 1);
2576 if (copy_from_user(buf, user_buf, buf_size))
2577 return -EFAULT;
2578
2579 if (sscanf(buf, "%x", &parsed_rate) == 1)
c33104f0 2580 lq_sta->dbg_fixed.rate_n_flags = parsed_rate;
98d7e09a 2581 else
c33104f0 2582 lq_sta->dbg_fixed.rate_n_flags = 0;
98d7e09a 2583
c33104f0
TW		 2584 lq_sta->active_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2585 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2586 lq_sta->active_mimo_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
98d7e09a
ZY		 2587
2588 IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
c33104f0 2589 lq_sta->lq.sta_id, lq_sta->dbg_fixed.rate_n_flags);
98d7e09a 2590
c33104f0
TW		 2591 if (lq_sta->dbg_fixed.rate_n_flags) {
2592 rs_fill_link_cmd(lq_sta, &lq_sta->dbg_fixed, &lq_sta->lq);
2593 rs_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
98d7e09a
ZY		 2594 }
2595
2596 return count;
2597}
0209dc11 2598
5ae212c9
ZY		 2599static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2600 char __user *user_buf, size_t count, loff_t *ppos)
2601{
2602 char buff[1024];
2603 int desc = 0;
2604 int i = 0;
2605
c33104f0 2606 struct iwl4965_lq_sta *lq_sta = file->private_data;
5ae212c9 2607
c33104f0 2608 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
98d7e09a 2609 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
c33104f0
TW		 2610 lq_sta->total_failed, lq_sta->total_success,
2611 lq_sta->active_rate);
98d7e09a 2612 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
c33104f0 2613 lq_sta->dbg_fixed.rate_n_flags);
5ae212c9
ZY		 2614 desc += sprintf(buff+desc, "general:"
2615 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
c33104f0
TW		 2616 lq_sta->lq.general_params.flags,
2617 lq_sta->lq.general_params.mimo_delimiter,
2618 lq_sta->lq.general_params.single_stream_ant_msk,
2619 lq_sta->lq.general_params.dual_stream_ant_msk);
5ae212c9
ZY		 2620
2621 desc += sprintf(buff+desc, "agg:"
2622 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
c33104f0
TW		 2623 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2624 lq_sta->lq.agg_params.agg_dis_start_th,
2625 lq_sta->lq.agg_params.agg_frame_cnt_limit);
5ae212c9
ZY		 2626
2627 desc += sprintf(buff+desc,
2628 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
c33104f0
TW		 2629 lq_sta->lq.general_params.start_rate_index[0],
2630 lq_sta->lq.general_params.start_rate_index[1],
2631 lq_sta->lq.general_params.start_rate_index[2],
2632 lq_sta->lq.general_params.start_rate_index[3]);
5ae212c9
ZY		 2633
2634
2635 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2636 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
c33104f0 2637 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
5ae212c9
ZY		 2638
2639 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2640}
2641
2642static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
98d7e09a 2643 .write = rs_sta_dbgfs_scale_table_write,
5ae212c9
ZY		 2644 .read = rs_sta_dbgfs_scale_table_read,
2645 .open = open_file_generic,
2646};
0209dc11
ZY		 2647static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2648 char __user *user_buf, size_t count, loff_t *ppos)
2649{
2650 char buff[1024];
2651 int desc = 0;
2652 int i, j;
2653
c33104f0 2654 struct iwl4965_lq_sta *lq_sta = file->private_data;
0209dc11
ZY		 2655 for (i = 0; i < LQ_SIZE; i++) {
2656 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2657 "rate=0x%X\n",
c33104f0
TW		 2658 lq_sta->active_tbl == i?"*":"x",
2659 lq_sta->lq_info[i].lq_type,
2660 lq_sta->lq_info[i].is_SGI,
2661 lq_sta->lq_info[i].is_fat,
2662 lq_sta->lq_info[i].is_dup,
2663 lq_sta->lq_info[i].current_rate.rate_n_flags);
0209dc11
ZY		 2664 for (j = 0; j < IWL_RATE_COUNT; j++) {
2665 desc += sprintf(buff+desc,
c33104f0
TW		 2666 "counter=%d success=%d %%=%d\n",
2667 lq_sta->lq_info[i].win[j].counter,
2668 lq_sta->lq_info[i].win[j].success_counter,
2669 lq_sta->lq_info[i].win[j].success_ratio);
0209dc11
ZY		 2670 }
2671 }
2672 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2673}
2674
2675static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2676 .read = rs_sta_dbgfs_stats_table_read,
2677 .open = open_file_generic,
2678};
5ae212c9 2679
93dc646a
ZY		 2680static void rs_add_debugfs(void *priv, void *priv_sta,
2681 struct dentry *dir)
2682{
c33104f0
TW		 2683 struct iwl4965_lq_sta *lq_sta = priv_sta;
2684 lq_sta->rs_sta_dbgfs_scale_table_file =
0209dc11 2685 debugfs_create_file("rate_scale_table", 0600, dir,
c33104f0
TW		 2686 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2687 lq_sta->rs_sta_dbgfs_stats_table_file =
0209dc11 2688 debugfs_create_file("rate_stats_table", 0600, dir,
c33104f0 2689 lq_sta, &rs_sta_dbgfs_stats_table_ops);
0c11b4de
RR		 2690#ifdef CONFIG_IWL4965_HT
2691 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2692 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
2693 &lq_sta->tx_agg_tid_en);
2694#endif
2695
93dc646a
ZY		 2696}
2697
2698static void rs_remove_debugfs(void *priv, void *priv_sta)
2699{
c33104f0
TW		 2700 struct iwl4965_lq_sta *lq_sta = priv_sta;
2701 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2702 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
0c11b4de
RR		 2703#ifdef CONFIG_IWL4965_HT
2704 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2705#endif
93dc646a
ZY		 2706}
2707#endif
2708
b481de9c
ZY		 2709static struct rate_control_ops rs_ops = {
2710 .module = NULL,
2711 .name = RS_NAME,
2712 .tx_status = rs_tx_status,
2713 .get_rate = rs_get_rate,
2714 .rate_init = rs_rate_init,
2715 .clear = rs_clear,
2716 .alloc = rs_alloc,
2717 .free = rs_free,
2718 .alloc_sta = rs_alloc_sta,
2719 .free_sta = rs_free_sta,
93dc646a
ZY		 2720#ifdef CONFIG_MAC80211_DEBUGFS
2721 .add_sta_debugfs = rs_add_debugfs,
2722 .remove_sta_debugfs = rs_remove_debugfs,
2723#endif
b481de9c
ZY		 2724};
2725
bb8c093b 2726int iwl4965_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id)
b481de9c
ZY		 2727{
2728 struct ieee80211_local *local = hw_to_local(hw);
bb8c093b 2729 struct iwl4965_priv *priv = hw->priv;
c33104f0 2730 struct iwl4965_lq_sta *lq_sta;
b481de9c 2731 struct sta_info *sta;
c33104f0 2732 int cnt = 0, i;
b481de9c
ZY		 2733 u32 samples = 0, success = 0, good = 0;
2734 unsigned long now = jiffies;
2735 u32 max_time = 0;
2736 u8 lq_type, antenna;
2737
d0709a65
JB		 2738 rcu_read_lock();
2739
b481de9c
ZY		 2740 sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
2741 if (!sta || !sta->rate_ctrl_priv) {
d0709a65 2742 if (sta)
b481de9c 2743 IWL_DEBUG_RATE("leave - no private rate data!\n");
d0709a65 2744 else
b481de9c 2745 IWL_DEBUG_RATE("leave - no station!\n");
d0709a65 2746 rcu_read_unlock();
b481de9c
ZY		 2747 return sprintf(buf, "station %d not found\n", sta_id);
2748 }
2749
c33104f0 2750 lq_sta = (void *)sta->rate_ctrl_priv;
b481de9c 2751
c33104f0
TW		 2752 lq_type = lq_sta->lq_info[lq_sta->active_tbl].lq_type;
2753 antenna = lq_sta->lq_info[lq_sta->active_tbl].antenna_type;
b481de9c
ZY		 2754
2755 if (is_legacy(lq_type))
2756 i = IWL_RATE_54M_INDEX;
2757 else
2758 i = IWL_RATE_60M_INDEX;
2759 while (1) {
2760 u64 mask;
2761 int j;
c33104f0 2762 int active = lq_sta->active_tbl;
b481de9c 2763
c33104f0
TW		 2764 cnt +=
2765 sprintf(&buf[cnt], " %2dMbs: ", iwl4965_rates[i].ieee / 2);
b481de9c
ZY		 2766
2767 mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1));
2768 for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1)
c33104f0
TW		 2769 buf[cnt++] =
2770 (lq_sta->lq_info[active].win[i].data & mask)
b481de9c
ZY		 2771 ? '1' : '0';
2772
c33104f0
TW		 2773 samples += lq_sta->lq_info[active].win[i].counter;
2774 good += lq_sta->lq_info[active].win[i].success_counter;
2775 success += lq_sta->lq_info[active].win[i].success_counter *
bb8c093b 2776 iwl4965_rates[i].ieee;
b481de9c 2777
c33104f0 2778 if (lq_sta->lq_info[active].win[i].stamp) {
b481de9c
ZY		 2779 int delta =
2780 jiffies_to_msecs(now -
c33104f0 2781 lq_sta->lq_info[active].win[i].stamp);
b481de9c
ZY		 2782
2783 if (delta > max_time)
2784 max_time = delta;
2785
c33104f0 2786 cnt += sprintf(&buf[cnt], "%5dms\n", delta);
b481de9c 2787 } else
c33104f0 2788 buf[cnt++] = '\n';
b481de9c 2789
bb8c093b 2790 j = iwl4965_get_prev_ieee_rate(i);
b481de9c
ZY		 2791 if (j == i)
2792 break;
2793 i = j;
2794 }
2795
2796 /* Display the average rate of all samples taken.
2797 *
77626355 2798 * NOTE: We multiply # of samples by 2 since the IEEE measurement
bb8c093b 2799 * added from iwl4965_rates is actually 2X the rate */
b481de9c 2800 if (samples)
c33104f0 2801 cnt += sprintf(&buf[cnt],
b481de9c
ZY		 2802 "\nAverage rate is %3d.%02dMbs over last %4dms\n"
2803 "%3d%% success (%d good packets over %d tries)\n",
2804 success / (2 * samples), (success * 5 / samples) % 10,
2805 max_time, good * 100 / samples, good, samples);
2806 else
c33104f0
TW		 2807 cnt += sprintf(&buf[cnt], "\nAverage rate: 0Mbs\n");
2808
2809 cnt += sprintf(&buf[cnt], "\nrate scale type %d antenna %d "
b481de9c 2810 "active_search %d rate index %d\n", lq_type, antenna,
8318d78a 2811 lq_sta->search_better_tbl, sta->last_txrate_idx);
b481de9c 2812
d0709a65 2813 rcu_read_unlock();
c33104f0 2814 return cnt;
b481de9c
ZY		 2815}
2816
bb8c093b 2817void iwl4965_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
b481de9c 2818{
bb8c093b 2819 struct iwl4965_priv *priv = hw->priv;
b481de9c
ZY		 2820
2821 priv->lq_mngr.lq_ready = 1;
2822}
2823
bb8c093b 2824void iwl4965_rate_control_register(struct ieee80211_hw *hw)
b481de9c
ZY		 2825{
2826 ieee80211_rate_control_register(&rs_ops);
2827}
2828
bb8c093b 2829void iwl4965_rate_control_unregister(struct ieee80211_hw *hw)
b481de9c
ZY		 2830{
2831 ieee80211_rate_control_unregister(&rs_ops);
2832}
2833
Linux 6.x block layer and io_uring tree(s)