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s2io: Generate complete messages using single line DBG_PRINTs
[deliverable/linux.git] / drivers / net / wireless / iwlwifi / iwl-agn-rs.c
CommitLineData
b481de9c
ZY		 1/******************************************************************************
2 *
01f8162a 3 * Copyright(c) 2005 - 2009 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:
759ef89f 22 * Intel Linux Wireless <ilw@linux.intel.com>
b481de9c
ZY		 23 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
24 *
25 *****************************************************************************/
26#include <linux/kernel.h>
27#include <linux/init.h>
28#include <linux/skbuff.h>
29#include <linux/wireless.h>
30#include <net/mac80211.h>
b481de9c
ZY		 31
32#include <linux/netdevice.h>
33#include <linux/etherdevice.h>
34#include <linux/delay.h>
35
36#include <linux/workqueue.h>
37
3e0d4cb1 38#include "iwl-dev.h"
be1f3ab6 39#include "iwl-sta.h"
857485c0 40#include "iwl-core.h"
b481de9c 41
e227ceac 42#define RS_NAME "iwl-agn-rs"
b481de9c 43
aade00ce 44#define NUM_TRY_BEFORE_ANT_TOGGLE 1
b481de9c
ZY		 45#define IWL_NUMBER_TRY 1
46#define IWL_HT_NUMBER_TRY 3
47
77626355
BC		 48#define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
49#define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
50#define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
51
7d049e5a
AM		 52/* max allowed rate miss before sync LQ cmd */
53#define IWL_MISSED_RATE_MAX 15
77626355 54/* max time to accum history 2 seconds */
447fee70 55#define IWL_RATE_SCALE_FLUSH_INTVL (3*HZ)
b481de9c
ZY		 56
57static u8 rs_ht_to_legacy[] = {
58 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
59 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
60 IWL_RATE_6M_INDEX,
61 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
62 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
63 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
64 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
65};
66
aade00ce
GC		 67static const u8 ant_toggle_lookup[] = {
68 /*ANT_NONE -> */ ANT_NONE,
69 /*ANT_A -> */ ANT_B,
70 /*ANT_B -> */ ANT_C,
71 /*ANT_AB -> */ ANT_BC,
72 /*ANT_C -> */ ANT_A,
73 /*ANT_AC -> */ ANT_AB,
74 /*ANT_BC -> */ ANT_AC,
75 /*ANT_ABC -> */ ANT_ABC,
76};
77
77626355 78/**
e227ceac 79 * struct iwl_rate_scale_data -- tx success history for one rate
77626355 80 */
e227ceac 81struct iwl_rate_scale_data {
77626355
BC		 82 u64 data; /* bitmap of successful frames */
83 s32 success_counter; /* number of frames successful */
84 s32 success_ratio; /* per-cent * 128 */
85 s32 counter; /* number of frames attempted */
86 s32 average_tpt; /* success ratio * expected throughput */
b481de9c
ZY		 87 unsigned long stamp;
88};
89
77626355 90/**
e227ceac 91 * struct iwl_scale_tbl_info -- tx params and success history for all rates
77626355 92 *
e227ceac 93 * There are two of these in struct iwl_lq_sta,
77626355
BC		 94 * one for "active", and one for "search".
95 */
e227ceac 96struct iwl_scale_tbl_info {
fde0db31
GC		 97 enum iwl_table_type lq_type;
98 u8 ant_type;
77626355 99 u8 is_SGI; /* 1 = short guard interval */
7aafef1c 100 u8 is_ht40; /* 1 = 40 MHz channel width */
77626355
BC		 101 u8 is_dup; /* 1 = duplicated data streams */
102 u8 action; /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
d6e93399 103 u8 max_search; /* maximun number of tables we can search */
77626355 104 s32 *expected_tpt; /* throughput metrics; expected_tpt_G, etc. */
39e88504 105 u32 current_rate; /* rate_n_flags, uCode API format */
e227ceac 106 struct iwl_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
b481de9c
ZY		 107};
108
e227ceac 109struct iwl_traffic_load {
0c11b4de
RR		 110 unsigned long time_stamp; /* age of the oldest statistics */
111 u32 packet_count[TID_QUEUE_MAX_SIZE]; /* packet count in this time
112 * slice */
113 u32 total; /* total num of packets during the
114 * last TID_MAX_TIME_DIFF */
115 u8 queue_count; /* number of queues that has
116 * been used since the last cleanup */
117 u8 head; /* start of the circular buffer */
118};
119
77626355 120/**
e227ceac 121 * struct iwl_lq_sta -- driver's rate scaling private structure
77626355
BC		 122 *
123 * Pointer to this gets passed back and forth between driver and mac80211.
124 */
e227ceac 125struct iwl_lq_sta {
77626355
BC		 126 u8 active_tbl; /* index of active table, range 0-1 */
127 u8 enable_counter; /* indicates HT mode */
128 u8 stay_in_tbl; /* 1: disallow, 0: allow search for new mode */
129 u8 search_better_tbl; /* 1: currently trying alternate mode */
b481de9c 130 s32 last_tpt;
77626355
BC		 131
132 /* The following determine when to search for a new mode */
b481de9c 133 u32 table_count_limit;
77626355
BC		 134 u32 max_failure_limit; /* # failed frames before new search */
135 u32 max_success_limit; /* # successful frames before new search */
b481de9c 136 u32 table_count;
77626355
BC		 137 u32 total_failed; /* total failed frames, any/all rates */
138 u32 total_success; /* total successful frames, any/all rates */
447fee70 139 u64 flush_timer; /* time staying in mode before new search */
77626355
BC		 140
141 u8 action_counter; /* # mode-switch actions tried */
b481de9c
ZY		 142 u8 is_green;
143 u8 is_dup;
8318d78a 144 enum ieee80211_band band;
b481de9c 145 u8 ibss_sta_added;
77626355
BC		 146
147 /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
02dede04 148 u32 supp_rates;
39e88504 149 u16 active_legacy_rate;
b481de9c 150 u16 active_siso_rate;
fde0db31
GC		 151 u16 active_mimo2_rate;
152 u16 active_mimo3_rate;
b481de9c 153 u16 active_rate_basic;
c6ec7a9b 154 s8 max_rate_idx; /* Max rate set by user */
7d049e5a 155 u8 missed_rate_counter;
77626355 156
66c73db7 157 struct iwl_link_quality_cmd lq;
e227ceac
TW		 158 struct iwl_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
159 struct iwl_traffic_load load[TID_MAX_LOAD_COUNT];
0c11b4de 160 u8 tx_agg_tid_en;
5ae212c9 161#ifdef CONFIG_MAC80211_DEBUGFS
98d7e09a 162 struct dentry *rs_sta_dbgfs_scale_table_file;
0209dc11 163 struct dentry *rs_sta_dbgfs_stats_table_file;
38167459 164 struct dentry *rs_sta_dbgfs_rate_scale_data_file;
0c11b4de 165 struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
39e88504 166 u32 dbg_fixed_rate;
5ae212c9 167#endif
6243065d 168 struct iwl_priv *drv;
b7e35008
JB		 169
170 /* used to be in sta_info */
171 int last_txrate_idx;
12b96817
WYG		 172 /* last tx rate_n_flags */
173 u32 last_rate_n_flags;
b481de9c
ZY		 174};
175
c79dd5b5 176static void rs_rate_scale_perform(struct iwl_priv *priv,
514d65c1 177 struct sk_buff *skb,
4b7679a5
JB		 178 struct ieee80211_sta *sta,
179 struct iwl_lq_sta *lq_sta);
46f9381a 180static void rs_fill_link_cmd(struct iwl_priv *priv,
e227ceac 181 struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
b481de9c
ZY		 182
183
98d7e09a 184#ifdef CONFIG_MAC80211_DEBUGFS
e227ceac
TW		 185static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
186 u32 *rate_n_flags, int index);
98d7e09a 187#else
e227ceac
TW		 188static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
189 u32 *rate_n_flags, int index)
98d7e09a
ZY		 190{}
191#endif
77626355
BC		 192
193/*
194 * Expected throughput metrics for following rates:
195 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
196 * "G" is the only table that supports CCK (the first 4 rates).
197 */
584a0f00 198
b481de9c
ZY		 199static s32 expected_tpt_A[IWL_RATE_COUNT] = {
200 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
201};
202
203static s32 expected_tpt_G[IWL_RATE_COUNT] = {
204 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
205};
206
207static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
208 0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
209};
210
211static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
212 0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
213};
214
584a0f00 215static s32 expected_tpt_mimo2_20MHz[IWL_RATE_COUNT] = {
b481de9c
ZY		 216 0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
217};
218
584a0f00 219static s32 expected_tpt_mimo2_20MHzSGI[IWL_RATE_COUNT] = {
b481de9c
ZY		 220 0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
221};
222
223static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
224 0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
225};
226
227static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
228 0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
229};
230
584a0f00 231static s32 expected_tpt_mimo2_40MHz[IWL_RATE_COUNT] = {
b481de9c
ZY		 232 0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
233};
234
584a0f00 235static s32 expected_tpt_mimo2_40MHzSGI[IWL_RATE_COUNT] = {
b481de9c
ZY		 236 0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
237};
238
584a0f00
WYG		 239/* Expected throughput metric MIMO3 */
240static s32 expected_tpt_mimo3_20MHz[IWL_RATE_COUNT] = {
241 0, 0, 0, 0, 99, 99, 153, 186, 208, 239, 256, 263, 268
242};
243
244static s32 expected_tpt_mimo3_20MHzSGI[IWL_RATE_COUNT] = {
245 0, 0, 0, 0, 106, 106, 162, 194, 215, 246, 262, 268, 273
246};
247
248static s32 expected_tpt_mimo3_40MHz[IWL_RATE_COUNT] = {
249 0, 0, 0, 0, 152, 152, 211, 239, 255, 279, 290, 294, 297
250};
251
252static s32 expected_tpt_mimo3_40MHzSGI[IWL_RATE_COUNT] = {
253 0, 0, 0, 0, 160, 160, 219, 245, 261, 284, 294, 297, 300
254};
255
12b96817
WYG		 256/* mbps, mcs */
257const static struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
258 {"1", ""},
259 {"2", ""},
260 {"5.5", ""},
261 {"11", ""},
262 {"6", "BPSK 1/2"},
263 {"9", "BPSK 1/2"},
264 {"12", "QPSK 1/2"},
265 {"18", "QPSK 3/4"},
266 {"24", "16QAM 1/2"},
267 {"36", "16QAM 3/4"},
268 {"48", "64QAM 2/3"},
269 {"54", "64QAM 3/4"},
270 {"60", "64QAM 5/6"}
271};
272
a9c146b3
WYG		 273#define MCS_INDEX_PER_STREAM (8)
274
39e88504 275static inline u8 rs_extract_rate(u32 rate_n_flags)
b481de9c
ZY		 276{
277 return (u8)(rate_n_flags & 0xFF);
278}
279
e227ceac 280static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
b481de9c
ZY		 281{
282 window->data = 0;
283 window->success_counter = 0;
284 window->success_ratio = IWL_INVALID_VALUE;
285 window->counter = 0;
286 window->average_tpt = IWL_INVALID_VALUE;
287 window->stamp = 0;
b481de9c
ZY		 288}
289
aade00ce
GC		 290static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
291{
3ac7f146 292 return (ant_type & valid_antenna) == ant_type;
aade00ce
GC		 293}
294
0c11b4de
RR		 295/*
296 * removes the old data from the statistics. All data that is older than
297 * TID_MAX_TIME_DIFF, will be deleted.
298 */
e227ceac 299static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
0c11b4de
RR		 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 */
e227ceac 320static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
faa29718 321 struct ieee80211_hdr *hdr)
0c11b4de
RR		 322{
323 u32 curr_time = jiffies_to_msecs(jiffies);
324 u32 time_diff;
325 s32 index;
e227ceac 326 struct iwl_traffic_load *tl = NULL;
54dbb525 327 u8 tid;
0c11b4de 328
417f114b 329 if (ieee80211_is_data_qos(hdr->frame_control)) {
fd7c8a40 330 u8 *qc = ieee80211_get_qos_ctl(hdr);
54dbb525
TW		 331 tid = qc[0] & 0xf;
332 } else
faa29718 333 return MAX_TID_COUNT;
0c11b4de 334
e6a6cf4c
RC		 335 if (unlikely(tid >= TID_MAX_LOAD_COUNT))
336 return MAX_TID_COUNT;
337
0c11b4de
RR		 338 tl = &lq_data->load[tid];
339
340 curr_time -= curr_time % TID_ROUND_VALUE;
341
342 /* Happens only for the first packet. Initialize the data */
343 if (!(tl->queue_count)) {
344 tl->total = 1;
345 tl->time_stamp = curr_time;
346 tl->queue_count = 1;
347 tl->head = 0;
348 tl->packet_count[0] = 1;
faa29718 349 return MAX_TID_COUNT;
0c11b4de
RR		 350 }
351
352 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
353 index = time_diff / TID_QUEUE_CELL_SPACING;
354
355 /* The history is too long: remove data that is older than */
356 /* TID_MAX_TIME_DIFF */
357 if (index >= TID_QUEUE_MAX_SIZE)
358 rs_tl_rm_old_stats(tl, curr_time);
359
360 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
361 tl->packet_count[index] = tl->packet_count[index] + 1;
362 tl->total = tl->total + 1;
363
364 if ((index + 1) > tl->queue_count)
365 tl->queue_count = index + 1;
faa29718
RR		 366
367 return tid;
0c11b4de
RR		 368}
369
370/*
371 get the traffic load value for tid
372*/
e227ceac 373static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
0c11b4de
RR		 374{
375 u32 curr_time = jiffies_to_msecs(jiffies);
376 u32 time_diff;
377 s32 index;
e227ceac 378 struct iwl_traffic_load *tl = NULL;
0c11b4de
RR		 379
380 if (tid >= TID_MAX_LOAD_COUNT)
381 return 0;
382
383 tl = &(lq_data->load[tid]);
384
385 curr_time -= curr_time % TID_ROUND_VALUE;
386
387 if (!(tl->queue_count))
388 return 0;
389
390 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
391 index = time_diff / TID_QUEUE_CELL_SPACING;
392
393 /* The history is too long: remove data that is older than */
394 /* TID_MAX_TIME_DIFF */
395 if (index >= TID_QUEUE_MAX_SIZE)
396 rs_tl_rm_old_stats(tl, curr_time);
397
398 return tl->total;
399}
400
c79dd5b5 401static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
e227ceac 402 struct iwl_lq_sta *lq_data, u8 tid,
4b7679a5 403 struct ieee80211_sta *sta)
0c11b4de 404{
ff550cb4 405 if (rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
e1623446 406 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
e174961c 407 sta->addr, tid);
4b7679a5 408 ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
0c11b4de
RR		 409 }
410}
411
c79dd5b5 412static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
e227ceac 413 struct iwl_lq_sta *lq_data,
4b7679a5 414 struct ieee80211_sta *sta)
0c11b4de
RR		 415{
416 if ((tid < TID_MAX_LOAD_COUNT))
417 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
418 else if (tid == IWL_AGG_ALL_TID)
419 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
420 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
421}
422
39e88504 423static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
fde0db31 424{
3ac7f146
TW		 425 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
426 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
427 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
fde0db31
GC		 428}
429
77626355
BC		 430/**
431 * rs_collect_tx_data - Update the success/failure sliding window
432 *
433 * We keep a sliding window of the last 62 packets transmitted
434 * at this rate. window->data contains the bitmask of successful
435 * packets.
436 */
e227ceac 437static int rs_collect_tx_data(struct iwl_rate_scale_data *windows,
99556438
RR		 438 int scale_index, s32 tpt, int retries,
439 int successes)
b481de9c 440{
e227ceac 441 struct iwl_rate_scale_data *window = NULL;
39e88504 442 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
b481de9c
ZY		 443 s32 fail_count;
444
dc2453ae
TW		 445 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
446 return -EINVAL;
b481de9c 447
77626355 448 /* Select data for current tx bit rate */
b481de9c
ZY		 449 window = &(windows[scale_index]);
450
77626355
BC		 451 /*
452 * Keep track of only the latest 62 tx frame attempts in this rate's
453 * history window; anything older isn't really relevant any more.
454 * If we have filled up the sliding window, drop the oldest attempt;
455 * if the oldest attempt (highest bit in bitmap) shows "success",
456 * subtract "1" from the success counter (this is the main reason
457 * we keep these bitmaps!).
458 */
99556438 459 while (retries > 0) {
39e88504
GC		 460 if (window->counter >= IWL_RATE_MAX_WINDOW) {
461
462 /* remove earliest */
463 window->counter = IWL_RATE_MAX_WINDOW - 1;
464
99556438
RR		 465 if (window->data & mask) {
466 window->data &= ~mask;
39e88504 467 window->success_counter--;
99556438 468 }
b481de9c 469 }
b481de9c 470
99556438
RR		 471 /* Increment frames-attempted counter */
472 window->counter++;
473
474 /* Shift bitmap by one frame (throw away oldest history),
475 * OR in "1", and increment "success" if this
476 * frame was successful. */
90d7795e 477 window->data <<= 1;
99556438 478 if (successes > 0) {
39e88504 479 window->success_counter++;
99556438
RR		 480 window->data |= 0x1;
481 successes--;
482 }
77626355 483
99556438 484 retries--;
b481de9c
ZY		 485 }
486
77626355 487 /* Calculate current success ratio, avoid divide-by-0! */
b481de9c
ZY		 488 if (window->counter > 0)
489 window->success_ratio = 128 * (100 * window->success_counter)
490 / window->counter;
491 else
492 window->success_ratio = IWL_INVALID_VALUE;
493
494 fail_count = window->counter - window->success_counter;
495
77626355 496 /* Calculate average throughput, if we have enough history. */
b481de9c
ZY		 497 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
498 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
499 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
500 else
501 window->average_tpt = IWL_INVALID_VALUE;
502
77626355 503 /* Tag this window as having been updated */
b481de9c
ZY		 504 window->stamp = jiffies;
505
dc2453ae 506 return 0;
b481de9c
ZY		 507}
508
77626355
BC		 509/*
510 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
511 */
39e88504 512/* FIXME:RS:remove this function and put the flags statically in the table */
978785a3
TW		 513static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
514 struct iwl_scale_tbl_info *tbl,
515 int index, u8 use_green)
b481de9c 516{
39e88504
GC		 517 u32 rate_n_flags = 0;
518
b481de9c 519 if (is_legacy(tbl->lq_type)) {
1826dcc0 520 rate_n_flags = iwl_rates[index].plcp;
b481de9c 521 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
39e88504 522 rate_n_flags |= RATE_MCS_CCK_MSK;
b481de9c 523
fde0db31
GC		 524 } else if (is_Ht(tbl->lq_type)) {
525 if (index > IWL_LAST_OFDM_RATE) {
978785a3 526 IWL_ERR(priv, "Invalid HT rate index %d\n", index);
b481de9c 527 index = IWL_LAST_OFDM_RATE;
fde0db31 528 }
39e88504 529 rate_n_flags = RATE_MCS_HT_MSK;
fde0db31
GC		 530
531 if (is_siso(tbl->lq_type))
1826dcc0 532 rate_n_flags |= iwl_rates[index].plcp_siso;
fde0db31 533 else if (is_mimo2(tbl->lq_type))
1826dcc0 534 rate_n_flags |= iwl_rates[index].plcp_mimo2;
fde0db31 535 else
1826dcc0 536 rate_n_flags |= iwl_rates[index].plcp_mimo3;
b481de9c 537 } else {
978785a3 538 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
b481de9c
ZY		 539 }
540
39e88504 541 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
fde0db31 542 RATE_MCS_ANT_ABC_MSK);
b481de9c 543
39e88504 544 if (is_Ht(tbl->lq_type)) {
7aafef1c 545 if (tbl->is_ht40) {
39e88504
GC		 546 if (tbl->is_dup)
547 rate_n_flags |= RATE_MCS_DUP_MSK;
548 else
7aafef1c 549 rate_n_flags |= RATE_MCS_HT40_MSK;
39e88504
GC		 550 }
551 if (tbl->is_SGI)
552 rate_n_flags |= RATE_MCS_SGI_MSK;
553
554 if (use_green) {
555 rate_n_flags |= RATE_MCS_GF_MSK;
556 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
557 rate_n_flags &= ~RATE_MCS_SGI_MSK;
978785a3 558 IWL_ERR(priv, "GF was set with SGI:SISO\n");
39e88504
GC		 559 }
560 }
b481de9c 561 }
39e88504 562 return rate_n_flags;
b481de9c
ZY		 563}
564
77626355
BC		 565/*
566 * Interpret uCode API's rate_n_flags format,
567 * fill "search" or "active" tx mode table.
568 */
39e88504 569static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
8318d78a 570 enum ieee80211_band band,
e227ceac 571 struct iwl_scale_tbl_info *tbl,
b481de9c
ZY		 572 int *rate_idx)
573{
39e88504
GC		 574 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
575 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
576 u8 mcs;
b481de9c 577
e7d326ac 578 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
b481de9c 579
fde0db31 580 if (*rate_idx == IWL_RATE_INVALID) {
b481de9c 581 *rate_idx = -1;
dc2453ae 582 return -EINVAL;
b481de9c 583 }
77626355 584 tbl->is_SGI = 0; /* default legacy setup */
7aafef1c 585 tbl->is_ht40 = 0;
b481de9c 586 tbl->is_dup = 0;
fde0db31
GC		 587 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
588 tbl->lq_type = LQ_NONE;
d6e93399 589 tbl->max_search = IWL_MAX_SEARCH;
b481de9c 590
77626355 591 /* legacy rate format */
39e88504 592 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
fde0db31 593 if (num_of_ant == 1) {
8318d78a 594 if (band == IEEE80211_BAND_5GHZ)
b481de9c
ZY		 595 tbl->lq_type = LQ_A;
596 else
597 tbl->lq_type = LQ_G;
b481de9c 598 }
fde0db31 599 /* HT rate format */
b481de9c 600 } else {
39e88504 601 if (rate_n_flags & RATE_MCS_SGI_MSK)
b481de9c
ZY		 602 tbl->is_SGI = 1;
603
7aafef1c 604 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
39e88504 605 (rate_n_flags & RATE_MCS_DUP_MSK))
7aafef1c 606 tbl->is_ht40 = 1;
b481de9c 607
39e88504 608 if (rate_n_flags & RATE_MCS_DUP_MSK)
b481de9c 609 tbl->is_dup = 1;
fde0db31 610
39e88504 611 mcs = rs_extract_rate(rate_n_flags);
fde0db31 612
39e88504
GC		 613 /* SISO */
614 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
fde0db31
GC		 615 if (num_of_ant == 1)
616 tbl->lq_type = LQ_SISO; /*else NONE*/
617 /* MIMO2 */
39e88504 618 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
fde0db31
GC		 619 if (num_of_ant == 2)
620 tbl->lq_type = LQ_MIMO2;
621 /* MIMO3 */
622 } else {
d6e93399
MA		 623 if (num_of_ant == 3) {
624 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
fde0db31 625 tbl->lq_type = LQ_MIMO3;
d6e93399 626 }
fde0db31 627 }
b481de9c
ZY		 628 }
629 return 0;
630}
aade00ce
GC		 631
632/* switch to another antenna/antennas and return 1 */
633/* if no other valid antenna found, return 0 */
634static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
e227ceac 635 struct iwl_scale_tbl_info *tbl)
b481de9c 636{
aade00ce
GC		 637 u8 new_ant_type;
638
639 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
640 return 0;
641
642 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
643 return 0;
644
645 new_ant_type = ant_toggle_lookup[tbl->ant_type];
646
647 while ((new_ant_type != tbl->ant_type) &&
648 !rs_is_valid_ant(valid_ant, new_ant_type))
649 new_ant_type = ant_toggle_lookup[new_ant_type];
650
651 if (new_ant_type == tbl->ant_type)
652 return 0;
653
654 tbl->ant_type = new_ant_type;
655 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
656 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
657 return 1;
b481de9c
ZY		 658}
659
b261793d
DH		 660/**
661 * Green-field mode is valid if the station supports it and
662 * there are no non-GF stations present in the BSS.
663 */
664static inline u8 rs_use_green(struct ieee80211_sta *sta,
665 struct iwl_ht_info *ht_conf)
b481de9c 666{
b261793d
DH		 667 return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
668 !(ht_conf->non_GF_STA_present);
b481de9c
ZY		 669}
670
671/**
672 * rs_get_supported_rates - get the available rates
673 *
674 * if management frame or broadcast frame only return
675 * basic available rates.
676 *
677 */
e227ceac
TW		 678static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
679 struct ieee80211_hdr *hdr,
680 enum iwl_table_type rate_type)
b481de9c 681{
eecd6e57
GC		 682 if (hdr && is_multicast_ether_addr(hdr->addr1) &&
683 lq_sta->active_rate_basic)
684 return lq_sta->active_rate_basic;
685
686 if (is_legacy(rate_type)) {
687 return lq_sta->active_legacy_rate;
688 } else {
b481de9c 689 if (is_siso(rate_type))
eecd6e57 690 return lq_sta->active_siso_rate;
fde0db31 691 else if (is_mimo2(rate_type))
eecd6e57 692 return lq_sta->active_mimo2_rate;
b481de9c 693 else
eecd6e57 694 return lq_sta->active_mimo3_rate;
c33104f0 695 }
b481de9c
ZY		 696}
697
bf403db8
EK		 698static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
699 int rate_type)
b481de9c
ZY		 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) {
1826dcc0 733 low = iwl_rates[low].prev_rs;
b481de9c
ZY		 734 if (low == IWL_RATE_INVALID)
735 break;
736 if (rate_mask & (1 << low))
737 break;
e1623446 738 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
b481de9c
ZY		 739 }
740
741 high = index;
742 while (high != IWL_RATE_INVALID) {
1826dcc0 743 high = iwl_rates[high].next_rs;
b481de9c
ZY		 744 if (high == IWL_RATE_INVALID)
745 break;
746 if (rate_mask & (1 << high))
747 break;
e1623446 748 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
b481de9c
ZY		 749 }
750
751 return (high << 8) | low;
752}
753
e227ceac
TW		 754static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
755 struct iwl_scale_tbl_info *tbl,
756 u8 scale_index, u8 ht_possible)
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
69fdb309 775 if (num_of_ant(tbl->ant_type) > 1)
fde0db31 776 tbl->ant_type = ANT_A;/*FIXME:RS*/
b481de9c 777
7aafef1c 778 tbl->is_ht40 = 0;
b481de9c 779 tbl->is_SGI = 0;
d6e93399 780 tbl->max_search = IWL_MAX_SEARCH;
b481de9c
ZY		 781 }
782
eecd6e57 783 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
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))) {
39e88504
GC		 797 low = scale_index;
798 goto out;
b481de9c
ZY		 799 }
800
bf403db8
EK		 801 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
802 tbl->lq_type);
b481de9c
ZY		 803 low = high_low & 0xff;
804
39e88504
GC		 805 if (low == IWL_RATE_INVALID)
806 low = scale_index;
807
808out:
978785a3 809 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
b481de9c
ZY		 810}
811
77626355
BC		 812/*
813 * mac80211 sends us Tx status
814 */
4b7679a5
JB		 815static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
816 struct ieee80211_sta *sta, void *priv_sta,
e039fa4a 817 struct sk_buff *skb)
b481de9c
ZY		 818{
819 int status;
820 u8 retries;
821 int rs_index, index = 0;
417f114b 822 struct iwl_lq_sta *lq_sta = priv_sta;
66c73db7 823 struct iwl_link_quality_cmd *table;
b481de9c 824 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
4b7679a5
JB		 825 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
826 struct ieee80211_hw *hw = priv->hw;
e039fa4a 827 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
e227ceac
TW		 828 struct iwl_rate_scale_data *window = NULL;
829 struct iwl_rate_scale_data *search_win = NULL;
39e88504 830 u32 tx_rate;
e227ceac
TW		 831 struct iwl_scale_tbl_info tbl_type;
832 struct iwl_scale_tbl_info *curr_tbl, *search_tbl;
b481de9c 833 u8 active_index = 0;
b481de9c
ZY		 834 s32 tpt = 0;
835
e1623446 836 IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
b481de9c 837
417f114b 838 if (!ieee80211_is_data(hdr->frame_control) ||
514d65c1 839 info->flags & IEEE80211_TX_CTL_NO_ACK)
b481de9c
ZY		 840 return;
841
99556438 842 /* This packet was aggregated but doesn't carry rate scale info */
e039fa4a
JB		 843 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
844 !(info->flags & IEEE80211_TX_STAT_AMPDU))
99556438
RR		 845 return;
846
8fe72311
WYG		 847 if (info->flags & IEEE80211_TX_STAT_AMPDU)
848 retries = 0;
849 else
850 retries = info->status.rates[0].count - 1;
b481de9c
ZY		 851
852 if (retries > 15)
853 retries = 15;
854
05c914fe 855 if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
c33104f0 856 !lq_sta->ibss_sta_added)
f4d6082d 857 goto out;
b481de9c 858
c33104f0
TW		 859 table = &lq_sta->lq;
860 active_index = lq_sta->active_tbl;
b481de9c 861
c33104f0
TW		 862 curr_tbl = &(lq_sta->lq_info[active_index]);
863 search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
e227ceac
TW		 864 window = (struct iwl_rate_scale_data *)&(curr_tbl->win[0]);
865 search_win = (struct iwl_rate_scale_data *)&(search_tbl->win[0]);
b481de9c 866
77626355
BC		 867 /*
868 * Ignore this Tx frame response if its initial rate doesn't match
869 * that of latest Link Quality command. There may be stragglers
870 * from a previous Link Quality command, but we're no longer interested
871 * in those; they're either from the "active" mode while we're trying
872 * to check "search" mode, or a prior "search" mode after we've moved
873 * to a new "search" mode (which might become the new "active" mode).
874 */
39e88504
GC		 875 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
876 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
4c424e4c
RR		 877 if (priv->band == IEEE80211_BAND_5GHZ)
878 rs_index -= IWL_FIRST_OFDM_RATE;
879
e6a9854b
JB		 880 if ((info->status.rates[0].idx < 0) ||
881 (tbl_type.is_SGI != !!(info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)) ||
7aafef1c 882 (tbl_type.is_ht40 != !!(info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
e6a9854b
JB		 883 (tbl_type.is_dup != !!(info->status.rates[0].flags & IEEE80211_TX_RC_DUP_DATA)) ||
884 (tbl_type.ant_type != info->antenna_sel_tx) ||
885 (!!(tx_rate & RATE_MCS_HT_MSK) != !!(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) ||
886 (!!(tx_rate & RATE_MCS_GF_MSK) != !!(info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
4c424e4c 887 (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
e6a9854b 888 hw->wiphy->bands[info->band]->bitrates[info->status.rates[0].idx].bitrate)) {
e1623446 889 IWL_DEBUG_RATE(priv, "initial rate does not match 0x%x\n", tx_rate);
d5e49036
MA		 890 /* the last LQ command could failed so the LQ in ucode not
891 * the same in driver sync up
892 */
7d049e5a
AM		 893 lq_sta->missed_rate_counter++;
894 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
895 lq_sta->missed_rate_counter = 0;
896 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
897 }
f4d6082d 898 goto out;
b481de9c
ZY		 899 }
900
7d049e5a 901 lq_sta->missed_rate_counter = 0;
77626355 902 /* Update frame history window with "failure" for each Tx retry. */
b481de9c 903 while (retries) {
77626355
BC		 904 /* Look up the rate and other info used for each tx attempt.
905 * Each tx attempt steps one entry deeper in the rate table. */
39e88504
GC		 906 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
907 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
b481de9c
ZY		 908 &tbl_type, &rs_index);
909
77626355
BC		 910 /* If type matches "search" table,
911 * add failure to "search" history */
b481de9c 912 if ((tbl_type.lq_type == search_tbl->lq_type) &&
fde0db31 913 (tbl_type.ant_type == search_tbl->ant_type) &&
b481de9c
ZY		 914 (tbl_type.is_SGI == search_tbl->is_SGI)) {
915 if (search_tbl->expected_tpt)
916 tpt = search_tbl->expected_tpt[rs_index];
917 else
918 tpt = 0;
99556438 919 rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
77626355
BC		 920
921 /* Else if type matches "current/active" table,
922 * add failure to "current/active" history */
b481de9c 923 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
fde0db31 924 (tbl_type.ant_type == curr_tbl->ant_type) &&
b481de9c
ZY		 925 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
926 if (curr_tbl->expected_tpt)
927 tpt = curr_tbl->expected_tpt[rs_index];
928 else
929 tpt = 0;
99556438 930 rs_collect_tx_data(window, rs_index, tpt, 1, 0);
b481de9c 931 }
77626355
BC		 932
933 /* If not searching for a new mode, increment failed counter
934 * ... this helps determine when to start searching again */
c33104f0
TW		 935 if (lq_sta->stay_in_tbl)
936 lq_sta->total_failed++;
b481de9c
ZY		 937 --retries;
938 index++;
939
940 }
941
77626355
BC		 942 /*
943 * Find (by rate) the history window to update with final Tx attempt;
944 * if Tx was successful first try, use original rate,
945 * else look up the rate that was, finally, successful.
946 */
39e88504 947 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
12b96817 948 lq_sta->last_rate_n_flags = tx_rate;
39e88504 949 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
b481de9c 950
77626355 951 /* Update frame history window with "success" if Tx got ACKed ... */
e039fa4a 952 status = !!(info->flags & IEEE80211_TX_STAT_ACK);
b481de9c 953
77626355
BC		 954 /* If type matches "search" table,
955 * add final tx status to "search" history */
b481de9c 956 if ((tbl_type.lq_type == search_tbl->lq_type) &&
fde0db31 957 (tbl_type.ant_type == search_tbl->ant_type) &&
b481de9c
ZY		 958 (tbl_type.is_SGI == search_tbl->is_SGI)) {
959 if (search_tbl->expected_tpt)
960 tpt = search_tbl->expected_tpt[rs_index];
961 else
962 tpt = 0;
df36c044 963 if (info->flags & IEEE80211_TX_STAT_AMPDU)
99556438 964 rs_collect_tx_data(search_win, rs_index, tpt,
e039fa4a
JB		 965 info->status.ampdu_ack_len,
966 info->status.ampdu_ack_map);
99556438
RR		 967 else
968 rs_collect_tx_data(search_win, rs_index, tpt,
969 1, status);
77626355
BC		 970 /* Else if type matches "current/active" table,
971 * add final tx status to "current/active" history */
b481de9c 972 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
fde0db31 973 (tbl_type.ant_type == curr_tbl->ant_type) &&
b481de9c
ZY		 974 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
975 if (curr_tbl->expected_tpt)
976 tpt = curr_tbl->expected_tpt[rs_index];
977 else
978 tpt = 0;
df36c044 979 if (info->flags & IEEE80211_TX_STAT_AMPDU)
99556438 980 rs_collect_tx_data(window, rs_index, tpt,
e039fa4a
JB		 981 info->status.ampdu_ack_len,
982 info->status.ampdu_ack_map);
99556438
RR		 983 else
984 rs_collect_tx_data(window, rs_index, tpt,
985 1, status);
b481de9c
ZY		 986 }
987
77626355
BC		 988 /* If not searching for new mode, increment success/failed counter
989 * ... these help determine when to start searching again */
c33104f0 990 if (lq_sta->stay_in_tbl) {
df36c044 991 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
e039fa4a 992 lq_sta->total_success += info->status.ampdu_ack_map;
99556438 993 lq_sta->total_failed +=
e039fa4a 994 (info->status.ampdu_ack_len - info->status.ampdu_ack_map);
99556438
RR		 995 } else {
996 if (status)
997 lq_sta->total_success++;
998 else
999 lq_sta->total_failed++;
1000 }
b481de9c
ZY		 1001 }
1002
77626355 1003 /* See if there's a better rate or modulation mode to try. */
c338ba3c 1004 if (sta && sta->supp_rates[sband->band])
514d65c1 1005 rs_rate_scale_perform(priv, skb, sta, lq_sta);
f4d6082d 1006out:
b481de9c
ZY		 1007 return;
1008}
1009
77626355
BC		 1010/*
1011 * Begin a period of staying with a selected modulation mode.
1012 * Set "stay_in_tbl" flag to prevent any mode switches.
1013 * Set frame tx success limits according to legacy vs. high-throughput,
1014 * and reset overall (spanning all rates) tx success history statistics.
1015 * These control how long we stay using same modulation mode before
1016 * searching for a new mode.
1017 */
bf403db8 1018static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
e227ceac 1019 struct iwl_lq_sta *lq_sta)
b481de9c 1020{
e1623446 1021 IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
c33104f0 1022 lq_sta->stay_in_tbl = 1; /* only place this gets set */
b481de9c 1023 if (is_legacy) {
c33104f0
TW		 1024 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1025 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1026 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
b481de9c 1027 } else {
c33104f0
TW		 1028 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1029 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1030 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
b481de9c 1031 }
c33104f0
TW		 1032 lq_sta->table_count = 0;
1033 lq_sta->total_failed = 0;
1034 lq_sta->total_success = 0;
447fee70 1035 lq_sta->flush_timer = jiffies;
d6e93399 1036 lq_sta->action_counter = 0;
b481de9c
ZY		 1037}
1038
77626355
BC		 1039/*
1040 * Find correct throughput table for given mode of modulation
1041 */
e227ceac
TW		 1042static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1043 struct iwl_scale_tbl_info *tbl)
b481de9c
ZY		 1044{
1045 if (is_legacy(tbl->lq_type)) {
1046 if (!is_a_band(tbl->lq_type))
1047 tbl->expected_tpt = expected_tpt_G;
1048 else
1049 tbl->expected_tpt = expected_tpt_A;
1050 } else if (is_siso(tbl->lq_type)) {
7aafef1c 1051 if (tbl->is_ht40 && !lq_sta->is_dup)
b481de9c
ZY		 1052 if (tbl->is_SGI)
1053 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
1054 else
1055 tbl->expected_tpt = expected_tpt_siso40MHz;
1056 else if (tbl->is_SGI)
1057 tbl->expected_tpt = expected_tpt_siso20MHzSGI;
1058 else
1059 tbl->expected_tpt = expected_tpt_siso20MHz;
584a0f00 1060 } else if (is_mimo2(tbl->lq_type)) {
7aafef1c 1061 if (tbl->is_ht40 && !lq_sta->is_dup)
584a0f00
WYG		 1062 if (tbl->is_SGI)
1063 tbl->expected_tpt = expected_tpt_mimo2_40MHzSGI;
1064 else
1065 tbl->expected_tpt = expected_tpt_mimo2_40MHz;
1066 else if (tbl->is_SGI)
1067 tbl->expected_tpt = expected_tpt_mimo2_20MHzSGI;
1068 else
1069 tbl->expected_tpt = expected_tpt_mimo2_20MHz;
1070 } else if (is_mimo3(tbl->lq_type)) {
7aafef1c 1071 if (tbl->is_ht40 && !lq_sta->is_dup)
b481de9c 1072 if (tbl->is_SGI)
584a0f00 1073 tbl->expected_tpt = expected_tpt_mimo3_40MHzSGI;
b481de9c 1074 else
584a0f00 1075 tbl->expected_tpt = expected_tpt_mimo3_40MHz;
b481de9c 1076 else if (tbl->is_SGI)
584a0f00 1077 tbl->expected_tpt = expected_tpt_mimo3_20MHzSGI;
b481de9c 1078 else
584a0f00 1079 tbl->expected_tpt = expected_tpt_mimo3_20MHz;
b481de9c
ZY		 1080 } else
1081 tbl->expected_tpt = expected_tpt_G;
1082}
1083
77626355
BC		 1084/*
1085 * Find starting rate for new "search" high-throughput mode of modulation.
1086 * Goal is to find lowest expected rate (under perfect conditions) that is
1087 * above the current measured throughput of "active" mode, to give new mode
1088 * a fair chance to prove itself without too many challenges.
1089 *
1090 * This gets called when transitioning to more aggressive modulation
1091 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1092 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1093 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1094 * bit rate will typically need to increase, but not if performance was bad.
1095 */
c79dd5b5 1096static s32 rs_get_best_rate(struct iwl_priv *priv,
e227ceac
TW		 1097 struct iwl_lq_sta *lq_sta,
1098 struct iwl_scale_tbl_info *tbl, /* "search" */
f935a6da 1099 u16 rate_mask, s8 index)
b481de9c 1100{
77626355 1101 /* "active" values */
e227ceac 1102 struct iwl_scale_tbl_info *active_tbl =
c33104f0 1103 &(lq_sta->lq_info[lq_sta->active_tbl]);
b481de9c 1104 s32 active_sr = active_tbl->win[index].success_ratio;
b481de9c 1105 s32 active_tpt = active_tbl->expected_tpt[index];
77626355
BC		 1106
1107 /* expected "search" throughput */
1108 s32 *tpt_tbl = tbl->expected_tpt;
1109
1110 s32 new_rate, high, low, start_hi;
b481de9c 1111 u16 high_low;
f935a6da 1112 s8 rate = index;
b481de9c
ZY		 1113
1114 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1115
1116 for (; ;) {
bf403db8
EK		 1117 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1118 tbl->lq_type);
b481de9c
ZY		 1119
1120 low = high_low & 0xff;
1121 high = (high_low >> 8) & 0xff;
1122
77626355
BC		 1123 /*
1124 * Lower the "search" bit rate, to give new "search" mode
1125 * approximately the same throughput as "active" if:
1126 *
1127 * 1) "Active" mode has been working modestly well (but not
1128 * great), and expected "search" throughput (under perfect
1129 * conditions) at candidate rate is above the actual
1130 * measured "active" throughput (but less than expected
1131 * "active" throughput under perfect conditions).
1132 * OR
1133 * 2) "Active" mode has been working perfectly or very well
1134 * and expected "search" throughput (under perfect
1135 * conditions) at candidate rate is above expected
1136 * "active" throughput (under perfect conditions).
1137 */
c33104f0 1138 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
b481de9c
ZY		 1139 ((active_sr > IWL_RATE_DECREASE_TH) &&
1140 (active_sr <= IWL_RATE_HIGH_TH) &&
1141 (tpt_tbl[rate] <= active_tpt))) ||
1142 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1143 (tpt_tbl[rate] > active_tpt))) {
1144
77626355
BC		 1145 /* (2nd or later pass)
1146 * If we've already tried to raise the rate, and are
1147 * now trying to lower it, use the higher rate. */
b481de9c
ZY		 1148 if (start_hi != IWL_RATE_INVALID) {
1149 new_rate = start_hi;
1150 break;
1151 }
77626355 1152
b481de9c 1153 new_rate = rate;
77626355
BC		 1154
1155 /* Loop again with lower rate */
b481de9c
ZY		 1156 if (low != IWL_RATE_INVALID)
1157 rate = low;
77626355
BC		 1158
1159 /* Lower rate not available, use the original */
b481de9c
ZY		 1160 else
1161 break;
77626355
BC		 1162
1163 /* Else try to raise the "search" rate to match "active" */
b481de9c 1164 } else {
77626355
BC		 1165 /* (2nd or later pass)
1166 * If we've already tried to lower the rate, and are
1167 * now trying to raise it, use the lower rate. */
b481de9c
ZY		 1168 if (new_rate != IWL_RATE_INVALID)
1169 break;
77626355
BC		 1170
1171 /* Loop again with higher rate */
b481de9c
ZY		 1172 else if (high != IWL_RATE_INVALID) {
1173 start_hi = high;
1174 rate = high;
77626355
BC		 1175
1176 /* Higher rate not available, use the original */
b481de9c 1177 } else {
90d7795e 1178 new_rate = rate;
b481de9c
ZY		 1179 break;
1180 }
1181 }
1182 }
1183
1184 return new_rate;
1185}
b481de9c 1186
77626355 1187/*
584a0f00 1188 * Set up search table for MIMO2
77626355 1189 */
fde0db31 1190static int rs_switch_to_mimo2(struct iwl_priv *priv,
e227ceac 1191 struct iwl_lq_sta *lq_sta,
270243a5 1192 struct ieee80211_conf *conf,
4b7679a5 1193 struct ieee80211_sta *sta,
e227ceac 1194 struct iwl_scale_tbl_info *tbl, int index)
b481de9c 1195{
b481de9c
ZY		 1196 u16 rate_mask;
1197 s32 rate;
c33104f0 1198 s8 is_green = lq_sta->is_green;
b481de9c 1199
de27e64e 1200 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
b481de9c
ZY		 1201 return -1;
1202
d9fe60de 1203 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
00c5ae2f 1204 == WLAN_HT_CAP_SM_PS_STATIC)
b481de9c
ZY		 1205 return -1;
1206
77626355 1207 /* Need both Tx chains/antennas to support MIMO */
aade00ce 1208 if (priv->hw_params.tx_chains_num < 2)
b481de9c
ZY		 1209 return -1;
1210
e1623446 1211 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
39e88504
GC		 1212
1213 tbl->lq_type = LQ_MIMO2;
c33104f0 1214 tbl->is_dup = lq_sta->is_dup;
b481de9c 1215 tbl->action = 0;
d6e93399 1216 tbl->max_search = IWL_MAX_SEARCH;
39e88504
GC		 1217 rate_mask = lq_sta->active_mimo2_rate;
1218
7aafef1c
WYG		 1219 if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1220 tbl->is_ht40 = 1;
b481de9c 1221 else
7aafef1c 1222 tbl->is_ht40 = 0;
b481de9c 1223
eecd6e57 1224 rs_set_expected_tpt_table(lq_sta, tbl);
b481de9c 1225
f935a6da 1226 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
b481de9c 1227
e1623446 1228 IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
584a0f00
WYG		 1229 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1230 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1231 rate, rate_mask);
1232 return -1;
1233 }
1234 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1235
1236 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1237 tbl->current_rate, is_green);
1238 return 0;
1239}
1240
1241/*
1242 * Set up search table for MIMO3
1243 */
1244static int rs_switch_to_mimo3(struct iwl_priv *priv,
1245 struct iwl_lq_sta *lq_sta,
1246 struct ieee80211_conf *conf,
1247 struct ieee80211_sta *sta,
1248 struct iwl_scale_tbl_info *tbl, int index)
1249{
1250 u16 rate_mask;
1251 s32 rate;
1252 s8 is_green = lq_sta->is_green;
1253
1254 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1255 return -1;
1256
1257 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1258 == WLAN_HT_CAP_SM_PS_STATIC)
1259 return -1;
1260
1261 /* Need both Tx chains/antennas to support MIMO */
1262 if (priv->hw_params.tx_chains_num < 3)
1263 return -1;
1264
1265 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1266
1267 tbl->lq_type = LQ_MIMO3;
1268 tbl->is_dup = lq_sta->is_dup;
1269 tbl->action = 0;
d6e93399 1270 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
584a0f00
WYG		 1271 rate_mask = lq_sta->active_mimo3_rate;
1272
7aafef1c
WYG		 1273 if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1274 tbl->is_ht40 = 1;
584a0f00 1275 else
7aafef1c 1276 tbl->is_ht40 = 0;
39e88504 1277
584a0f00
WYG		 1278 rs_set_expected_tpt_table(lq_sta, tbl);
1279
1280 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1281
1282 IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1283 rate, rate_mask);
39e88504 1284 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
e1623446 1285 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
39e88504 1286 rate, rate_mask);
b481de9c 1287 return -1;
39e88504 1288 }
978785a3 1289 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
b481de9c 1290
e1623446 1291 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
39e88504 1292 tbl->current_rate, is_green);
dc2453ae 1293 return 0;
fde0db31 1294}
b481de9c 1295
77626355
BC		 1296/*
1297 * Set up search table for SISO
1298 */
c79dd5b5 1299static int rs_switch_to_siso(struct iwl_priv *priv,
e227ceac 1300 struct iwl_lq_sta *lq_sta,
270243a5 1301 struct ieee80211_conf *conf,
4b7679a5 1302 struct ieee80211_sta *sta,
e227ceac 1303 struct iwl_scale_tbl_info *tbl, int index)
b481de9c 1304{
b481de9c 1305 u16 rate_mask;
c33104f0 1306 u8 is_green = lq_sta->is_green;
b481de9c
ZY		 1307 s32 rate;
1308
de27e64e 1309 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
b481de9c
ZY		 1310 return -1;
1311
e1623446 1312 IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
39e88504 1313
c33104f0 1314 tbl->is_dup = lq_sta->is_dup;
b481de9c
ZY		 1315 tbl->lq_type = LQ_SISO;
1316 tbl->action = 0;
d6e93399 1317 tbl->max_search = IWL_MAX_SEARCH;
39e88504 1318 rate_mask = lq_sta->active_siso_rate;
b481de9c 1319
7aafef1c
WYG		 1320 if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1321 tbl->is_ht40 = 1;
b481de9c 1322 else
7aafef1c 1323 tbl->is_ht40 = 0;
b481de9c 1324
b481de9c 1325 if (is_green)
39e88504 1326 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
b481de9c 1327
eecd6e57 1328 rs_set_expected_tpt_table(lq_sta, tbl);
f935a6da 1329 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
b481de9c 1330
e1623446 1331 IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
b481de9c 1332 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
e1623446 1333 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
b481de9c
ZY		 1334 rate, rate_mask);
1335 return -1;
1336 }
978785a3 1337 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
e1623446 1338 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
39e88504 1339 tbl->current_rate, is_green);
403ab56b 1340 return 0;
b481de9c
ZY		 1341}
1342
77626355
BC		 1343/*
1344 * Try to switch to new modulation mode from legacy
1345 */
c79dd5b5 1346static int rs_move_legacy_other(struct iwl_priv *priv,
e227ceac 1347 struct iwl_lq_sta *lq_sta,
270243a5 1348 struct ieee80211_conf *conf,
4b7679a5 1349 struct ieee80211_sta *sta,
b481de9c
ZY		 1350 int index)
1351{
e227ceac
TW		 1352 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1353 struct iwl_scale_tbl_info *search_tbl =
1354 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1355 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1356 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1357 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
b481de9c 1358 u8 start_action = tbl->action;
fde0db31 1359 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
3110bef7 1360 u8 tx_chains_num = priv->hw_params.tx_chains_num;
fde0db31 1361 int ret = 0;
d6e93399 1362 u8 update_search_tbl_counter = 0;
b481de9c 1363
46f9381a
WYG		 1364 if (!iwl_ht_enabled(priv))
1365 /* stay in Legacy */
1366 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
3ad3b92a 1367 else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
46f9381a
WYG		 1368 tbl->action > IWL_LEGACY_SWITCH_SISO)
1369 tbl->action = IWL_LEGACY_SWITCH_SISO;
b481de9c 1370 for (; ;) {
d6e93399 1371 lq_sta->action_counter++;
b481de9c 1372 switch (tbl->action) {
3110bef7
GC		 1373 case IWL_LEGACY_SWITCH_ANTENNA1:
1374 case IWL_LEGACY_SWITCH_ANTENNA2:
e1623446 1375 IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
b481de9c 1376
3110bef7
GC		 1377 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1378 tx_chains_num <= 1) ||
1379 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1380 tx_chains_num <= 2))
1381 break;
1382
77626355 1383 /* Don't change antenna if success has been great */
b481de9c
ZY		 1384 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1385 break;
77626355 1386
77626355 1387 /* Set up search table to try other antenna */
b481de9c
ZY		 1388 memcpy(search_tbl, tbl, sz);
1389
aade00ce
GC		 1390 if (rs_toggle_antenna(valid_tx_ant,
1391 &search_tbl->current_rate, search_tbl)) {
d6e93399 1392 update_search_tbl_counter = 1;
3110bef7 1393 rs_set_expected_tpt_table(lq_sta, search_tbl);
aade00ce
GC		 1394 goto out;
1395 }
a5e8b505 1396 break;
b481de9c 1397 case IWL_LEGACY_SWITCH_SISO:
e1623446 1398 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
77626355
BC		 1399
1400 /* Set up search table to try SISO */
b481de9c 1401 memcpy(search_tbl, tbl, sz);
b481de9c 1402 search_tbl->is_SGI = 0;
c33104f0 1403 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
270243a5 1404 search_tbl, index);
dc2453ae 1405 if (!ret) {
c33104f0 1406 lq_sta->action_counter = 0;
b481de9c 1407 goto out;
dc2453ae 1408 }
b481de9c
ZY		 1409
1410 break;
3110bef7
GC		 1411 case IWL_LEGACY_SWITCH_MIMO2_AB:
1412 case IWL_LEGACY_SWITCH_MIMO2_AC:
1413 case IWL_LEGACY_SWITCH_MIMO2_BC:
e1623446 1414 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
77626355
BC		 1415
1416 /* Set up search table to try MIMO */
b481de9c 1417 memcpy(search_tbl, tbl, sz);
b481de9c 1418 search_tbl->is_SGI = 0;
3110bef7
GC		 1419
1420 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1421 search_tbl->ant_type = ANT_AB;
1422 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1423 search_tbl->ant_type = ANT_AC;
1424 else
1425 search_tbl->ant_type = ANT_BC;
1426
1427 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1428 break;
1429
fde0db31 1430 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
270243a5 1431 search_tbl, index);
dc2453ae 1432 if (!ret) {
c33104f0 1433 lq_sta->action_counter = 0;
b481de9c 1434 goto out;
dc2453ae 1435 }
b481de9c 1436 break;
584a0f00
WYG		 1437
1438 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1439 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1440
1441 /* Set up search table to try MIMO3 */
1442 memcpy(search_tbl, tbl, sz);
1443 search_tbl->is_SGI = 0;
1444
1445 search_tbl->ant_type = ANT_ABC;
1446
1447 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1448 break;
1449
1450 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1451 search_tbl, index);
1452 if (!ret) {
1453 lq_sta->action_counter = 0;
1454 goto out;
1455 }
1456 break;
b481de9c
ZY		 1457 }
1458 tbl->action++;
584a0f00 1459 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
3110bef7 1460 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
b481de9c
ZY		 1461
1462 if (tbl->action == start_action)
1463 break;
1464
1465 }
3110bef7 1466 search_tbl->lq_type = LQ_NONE;
b481de9c
ZY		 1467 return 0;
1468
3110bef7
GC		 1469out:
1470 lq_sta->search_better_tbl = 1;
b481de9c 1471 tbl->action++;
584a0f00 1472 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
3110bef7 1473 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
d6e93399
MA		 1474 if (update_search_tbl_counter)
1475 search_tbl->action = tbl->action;
b481de9c
ZY		 1476 return 0;
1477
1478}
1479
77626355
BC		 1480/*
1481 * Try to switch to new modulation mode from SISO
1482 */
c79dd5b5 1483static int rs_move_siso_to_other(struct iwl_priv *priv,
e227ceac 1484 struct iwl_lq_sta *lq_sta,
270243a5 1485 struct ieee80211_conf *conf,
4b7679a5 1486 struct ieee80211_sta *sta, int index)
b481de9c 1487{
c33104f0 1488 u8 is_green = lq_sta->is_green;
e227ceac
TW		 1489 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1490 struct iwl_scale_tbl_info *search_tbl =
1491 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1492 struct iwl_rate_scale_data *window = &(tbl->win[index]);
28e6f489 1493 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
e227ceac
TW		 1494 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1495 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
b481de9c 1496 u8 start_action = tbl->action;
fde0db31 1497 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
3110bef7 1498 u8 tx_chains_num = priv->hw_params.tx_chains_num;
d6e93399 1499 u8 update_search_tbl_counter = 0;
fde0db31 1500 int ret;
b481de9c 1501
3ad3b92a 1502 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
46f9381a
WYG		 1503 tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1504 /* stay in SISO */
1505 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1506 }
b481de9c 1507 for (;;) {
c33104f0 1508 lq_sta->action_counter++;
b481de9c 1509 switch (tbl->action) {
3110bef7
GC		 1510 case IWL_SISO_SWITCH_ANTENNA1:
1511 case IWL_SISO_SWITCH_ANTENNA2:
e1623446 1512 IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
3110bef7
GC		 1513
1514 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1515 tx_chains_num <= 1) ||
1516 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1517 tx_chains_num <= 2))
1518 break;
1519
b481de9c
ZY		 1520 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1521 break;
b481de9c
ZY		 1522
1523 memcpy(search_tbl, tbl, sz);
aade00ce 1524 if (rs_toggle_antenna(valid_tx_ant,
d6e93399
MA		 1525 &search_tbl->current_rate, search_tbl)) {
1526 update_search_tbl_counter = 1;
aade00ce 1527 goto out;
d6e93399 1528 }
a5e8b505 1529 break;
3110bef7
GC		 1530 case IWL_SISO_SWITCH_MIMO2_AB:
1531 case IWL_SISO_SWITCH_MIMO2_AC:
1532 case IWL_SISO_SWITCH_MIMO2_BC:
e1623446 1533 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
b481de9c 1534 memcpy(search_tbl, tbl, sz);
b481de9c 1535 search_tbl->is_SGI = 0;
3110bef7
GC		 1536
1537 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1538 search_tbl->ant_type = ANT_AB;
1539 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1540 search_tbl->ant_type = ANT_AC;
1541 else
1542 search_tbl->ant_type = ANT_BC;
1543
1544 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1545 break;
1546
fde0db31 1547 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
270243a5 1548 search_tbl, index);
3110bef7 1549 if (!ret)
b481de9c
ZY		 1550 goto out;
1551 break;
1552 case IWL_SISO_SWITCH_GI:
28e6f489
DH		 1553 if (!tbl->is_ht40 && !(ht_cap->cap &
1554 IEEE80211_HT_CAP_SGI_20))
a9841013 1555 break;
28e6f489
DH		 1556 if (tbl->is_ht40 && !(ht_cap->cap &
1557 IEEE80211_HT_CAP_SGI_40))
a9841013
EG		 1558 break;
1559
e1623446 1560 IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
0c11b4de 1561
b481de9c 1562 memcpy(search_tbl, tbl, sz);
39e88504
GC		 1563 if (is_green) {
1564 if (!tbl->is_SGI)
1565 break;
1566 else
15b1687c
WT		 1567 IWL_ERR(priv,
1568 "SGI was set in GF+SISO\n");
b481de9c 1569 }
39e88504 1570 search_tbl->is_SGI = !tbl->is_SGI;
eecd6e57 1571 rs_set_expected_tpt_table(lq_sta, search_tbl);
39e88504
GC		 1572 if (tbl->is_SGI) {
1573 s32 tpt = lq_sta->last_tpt / 100;
1574 if (tpt >= search_tbl->expected_tpt[index])
1575 break;
1576 }
978785a3
TW		 1577 search_tbl->current_rate =
1578 rate_n_flags_from_tbl(priv, search_tbl,
1579 index, is_green);
d6e93399 1580 update_search_tbl_counter = 1;
b481de9c 1581 goto out;
584a0f00
WYG		 1582 case IWL_SISO_SWITCH_MIMO3_ABC:
1583 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1584 memcpy(search_tbl, tbl, sz);
1585 search_tbl->is_SGI = 0;
1586 search_tbl->ant_type = ANT_ABC;
1587
1588 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1589 break;
1590
1591 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1592 search_tbl, index);
1593 if (!ret)
1594 goto out;
1595 break;
b481de9c
ZY		 1596 }
1597 tbl->action++;
584a0f00 1598 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
3110bef7 1599 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
b481de9c
ZY		 1600
1601 if (tbl->action == start_action)
1602 break;
1603 }
3110bef7 1604 search_tbl->lq_type = LQ_NONE;
b481de9c
ZY		 1605 return 0;
1606
1607 out:
3110bef7 1608 lq_sta->search_better_tbl = 1;
b481de9c 1609 tbl->action++;
584a0f00 1610 if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
3110bef7 1611 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
d6e93399
MA		 1612 if (update_search_tbl_counter)
1613 search_tbl->action = tbl->action;
1614
b481de9c
ZY		 1615 return 0;
1616}
1617
77626355 1618/*
584a0f00 1619 * Try to switch to new modulation mode from MIMO2
77626355 1620 */
584a0f00 1621static int rs_move_mimo2_to_other(struct iwl_priv *priv,
e227ceac 1622 struct iwl_lq_sta *lq_sta,
270243a5 1623 struct ieee80211_conf *conf,
4b7679a5 1624 struct ieee80211_sta *sta, int index)
b481de9c 1625{
c33104f0 1626 s8 is_green = lq_sta->is_green;
e227ceac
TW		 1627 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1628 struct iwl_scale_tbl_info *search_tbl =
1629 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
3110bef7 1630 struct iwl_rate_scale_data *window = &(tbl->win[index]);
28e6f489 1631 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
e227ceac
TW		 1632 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1633 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
b481de9c 1634 u8 start_action = tbl->action;
3110bef7
GC		 1635 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1636 u8 tx_chains_num = priv->hw_params.tx_chains_num;
d6e93399 1637 u8 update_search_tbl_counter = 0;
aade00ce 1638 int ret;
b481de9c 1639
3ad3b92a 1640 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
46f9381a
WYG		 1641 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1642 tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1643 /* switch in SISO */
1644 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1645 }
b481de9c 1646 for (;;) {
c33104f0 1647 lq_sta->action_counter++;
b481de9c 1648 switch (tbl->action) {
3110bef7
GC		 1649 case IWL_MIMO2_SWITCH_ANTENNA1:
1650 case IWL_MIMO2_SWITCH_ANTENNA2:
584a0f00 1651 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
3110bef7
GC		 1652
1653 if (tx_chains_num <= 2)
1654 break;
1655
1656 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1657 break;
1658
1659 memcpy(search_tbl, tbl, sz);
1660 if (rs_toggle_antenna(valid_tx_ant,
d6e93399
MA		 1661 &search_tbl->current_rate, search_tbl)) {
1662 update_search_tbl_counter = 1;
3110bef7 1663 goto out;
d6e93399 1664 }
3110bef7
GC		 1665 break;
1666 case IWL_MIMO2_SWITCH_SISO_A:
1667 case IWL_MIMO2_SWITCH_SISO_B:
1668 case IWL_MIMO2_SWITCH_SISO_C:
e1623446 1669 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
0c11b4de 1670
77626355 1671 /* Set up new search table for SISO */
b481de9c 1672 memcpy(search_tbl, tbl, sz);
39e88504 1673
3110bef7 1674 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
fde0db31 1675 search_tbl->ant_type = ANT_A;
3110bef7 1676 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
fde0db31 1677 search_tbl->ant_type = ANT_B;
3110bef7
GC		 1678 else
1679 search_tbl->ant_type = ANT_C;
1680
1681 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1682 break;
b481de9c 1683
c33104f0 1684 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
270243a5 1685 search_tbl, index);
3110bef7 1686 if (!ret)
b481de9c 1687 goto out;
3110bef7 1688
b481de9c
ZY		 1689 break;
1690
3110bef7 1691 case IWL_MIMO2_SWITCH_GI:
28e6f489
DH		 1692 if (!tbl->is_ht40 && !(ht_cap->cap &
1693 IEEE80211_HT_CAP_SGI_20))
a9841013 1694 break;
28e6f489
DH		 1695 if (tbl->is_ht40 && !(ht_cap->cap &
1696 IEEE80211_HT_CAP_SGI_40))
a9841013
EG		 1697 break;
1698
584a0f00 1699 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
77626355 1700
584a0f00 1701 /* Set up new search table for MIMO2 */
b481de9c 1702 memcpy(search_tbl, tbl, sz);
39e88504 1703 search_tbl->is_SGI = !tbl->is_SGI;
eecd6e57 1704 rs_set_expected_tpt_table(lq_sta, search_tbl);
77626355
BC		 1705 /*
1706 * If active table already uses the fastest possible
1707 * modulation (dual stream with short guard interval),
1708 * and it's working well, there's no need to look
1709 * for a better type of modulation!
1710 */
39e88504 1711 if (tbl->is_SGI) {
c33104f0 1712 s32 tpt = lq_sta->last_tpt / 100;
39e88504
GC		 1713 if (tpt >= search_tbl->expected_tpt[index])
1714 break;
b481de9c 1715 }
978785a3
TW		 1716 search_tbl->current_rate =
1717 rate_n_flags_from_tbl(priv, search_tbl,
1718 index, is_green);
d6e93399 1719 update_search_tbl_counter = 1;
b481de9c
ZY		 1720 goto out;
1721
584a0f00
WYG		 1722 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1723 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1724 memcpy(search_tbl, tbl, sz);
1725 search_tbl->is_SGI = 0;
1726 search_tbl->ant_type = ANT_ABC;
1727
1728 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1729 break;
1730
1731 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1732 search_tbl, index);
1733 if (!ret)
1734 goto out;
1735
1736 break;
b481de9c
ZY		 1737 }
1738 tbl->action++;
584a0f00 1739 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
3110bef7 1740 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
b481de9c
ZY		 1741
1742 if (tbl->action == start_action)
1743 break;
1744 }
3110bef7 1745 search_tbl->lq_type = LQ_NONE;
b481de9c
ZY		 1746 return 0;
1747 out:
3110bef7 1748 lq_sta->search_better_tbl = 1;
b481de9c 1749 tbl->action++;
584a0f00 1750 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
3110bef7 1751 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
d6e93399
MA		 1752 if (update_search_tbl_counter)
1753 search_tbl->action = tbl->action;
1754
b481de9c
ZY		 1755 return 0;
1756
1757}
1758
584a0f00
WYG		 1759/*
1760 * Try to switch to new modulation mode from MIMO3
1761 */
1762static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1763 struct iwl_lq_sta *lq_sta,
1764 struct ieee80211_conf *conf,
1765 struct ieee80211_sta *sta, int index)
1766{
1767 s8 is_green = lq_sta->is_green;
1768 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1769 struct iwl_scale_tbl_info *search_tbl =
1770 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1771 struct iwl_rate_scale_data *window = &(tbl->win[index]);
28e6f489 1772 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
584a0f00
WYG		 1773 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1774 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1775 u8 start_action = tbl->action;
1776 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1777 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1778 int ret;
d6e93399 1779 u8 update_search_tbl_counter = 0;
584a0f00 1780
3ad3b92a 1781 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
46f9381a
WYG		 1782 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1783 tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1784 /* switch in SISO */
1785 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1786 }
584a0f00
WYG		 1787 for (;;) {
1788 lq_sta->action_counter++;
1789 switch (tbl->action) {
1790 case IWL_MIMO3_SWITCH_ANTENNA1:
1791 case IWL_MIMO3_SWITCH_ANTENNA2:
1792 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
1793
1794 if (tx_chains_num <= 3)
1795 break;
1796
1797 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1798 break;
1799
1800 memcpy(search_tbl, tbl, sz);
1801 if (rs_toggle_antenna(valid_tx_ant,
1802 &search_tbl->current_rate, search_tbl))
1803 goto out;
1804 break;
1805 case IWL_MIMO3_SWITCH_SISO_A:
1806 case IWL_MIMO3_SWITCH_SISO_B:
1807 case IWL_MIMO3_SWITCH_SISO_C:
1808 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
1809
1810 /* Set up new search table for SISO */
1811 memcpy(search_tbl, tbl, sz);
1812
1813 if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
1814 search_tbl->ant_type = ANT_A;
1815 else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
1816 search_tbl->ant_type = ANT_B;
1817 else
1818 search_tbl->ant_type = ANT_C;
1819
1820 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1821 break;
1822
1823 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1824 search_tbl, index);
1825 if (!ret)
1826 goto out;
1827
1828 break;
1829
1830 case IWL_MIMO3_SWITCH_MIMO2_AB:
1831 case IWL_MIMO3_SWITCH_MIMO2_AC:
1832 case IWL_MIMO3_SWITCH_MIMO2_BC:
1833 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
1834
1835 memcpy(search_tbl, tbl, sz);
1836 search_tbl->is_SGI = 0;
1837 if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
1838 search_tbl->ant_type = ANT_AB;
1839 else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
1840 search_tbl->ant_type = ANT_AC;
1841 else
1842 search_tbl->ant_type = ANT_BC;
1843
1844 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1845 break;
1846
1847 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1848 search_tbl, index);
1849 if (!ret)
1850 goto out;
1851
1852 break;
1853
1854 case IWL_MIMO3_SWITCH_GI:
28e6f489
DH		 1855 if (!tbl->is_ht40 && !(ht_cap->cap &
1856 IEEE80211_HT_CAP_SGI_20))
584a0f00 1857 break;
28e6f489
DH		 1858 if (tbl->is_ht40 && !(ht_cap->cap &
1859 IEEE80211_HT_CAP_SGI_40))
584a0f00
WYG		 1860 break;
1861
1862 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
1863
1864 /* Set up new search table for MIMO */
1865 memcpy(search_tbl, tbl, sz);
1866 search_tbl->is_SGI = !tbl->is_SGI;
1867 rs_set_expected_tpt_table(lq_sta, search_tbl);
1868 /*
1869 * If active table already uses the fastest possible
1870 * modulation (dual stream with short guard interval),
1871 * and it's working well, there's no need to look
1872 * for a better type of modulation!
1873 */
1874 if (tbl->is_SGI) {
1875 s32 tpt = lq_sta->last_tpt / 100;
1876 if (tpt >= search_tbl->expected_tpt[index])
1877 break;
1878 }
1879 search_tbl->current_rate =
1880 rate_n_flags_from_tbl(priv, search_tbl,
1881 index, is_green);
d6e93399 1882 update_search_tbl_counter = 1;
584a0f00
WYG		 1883 goto out;
1884 }
1885 tbl->action++;
1886 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1887 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1888
1889 if (tbl->action == start_action)
1890 break;
1891 }
1892 search_tbl->lq_type = LQ_NONE;
1893 return 0;
1894 out:
1895 lq_sta->search_better_tbl = 1;
1896 tbl->action++;
1897 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1898 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
d6e93399
MA		 1899 if (update_search_tbl_counter)
1900 search_tbl->action = tbl->action;
1901
584a0f00
WYG		 1902 return 0;
1903
1904}
1905
77626355
BC		 1906/*
1907 * Check whether we should continue using same modulation mode, or
1908 * begin search for a new mode, based on:
1909 * 1) # tx successes or failures while using this mode
1910 * 2) # times calling this function
1911 * 3) elapsed time in this mode (not used, for now)
1912 */
e227ceac 1913static void rs_stay_in_table(struct iwl_lq_sta *lq_sta)
b481de9c 1914{
e227ceac 1915 struct iwl_scale_tbl_info *tbl;
b481de9c
ZY		 1916 int i;
1917 int active_tbl;
1918 int flush_interval_passed = 0;
bf403db8 1919 struct iwl_priv *priv;
b481de9c 1920
bf403db8 1921 priv = lq_sta->drv;
c33104f0 1922 active_tbl = lq_sta->active_tbl;
b481de9c 1923
c33104f0 1924 tbl = &(lq_sta->lq_info[active_tbl]);
b481de9c 1925
77626355 1926 /* If we've been disallowing search, see if we should now allow it */
c33104f0 1927 if (lq_sta->stay_in_tbl) {
b481de9c 1928
77626355 1929 /* Elapsed time using current modulation mode */
c33104f0 1930 if (lq_sta->flush_timer)
b481de9c 1931 flush_interval_passed =
447fee70
MA		 1932 time_after(jiffies,
1933 (unsigned long)(lq_sta->flush_timer +
b481de9c
ZY		 1934 IWL_RATE_SCALE_FLUSH_INTVL));
1935
77626355
BC		 1936 /*
1937 * Check if we should allow search for new modulation mode.
1938 * If many frames have failed or succeeded, or we've used
1939 * this same modulation for a long time, allow search, and
1940 * reset history stats that keep track of whether we should
1941 * allow a new search. Also (below) reset all bitmaps and
1942 * stats in active history.
1943 */
c33104f0
TW		 1944 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1945 (lq_sta->total_success > lq_sta->max_success_limit) ||
1946 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
b481de9c 1947 && (flush_interval_passed))) {
e1623446 1948 IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n:",
c33104f0
TW		 1949 lq_sta->total_failed,
1950 lq_sta->total_success,
b481de9c 1951 flush_interval_passed);
77626355
BC		 1952
1953 /* Allow search for new mode */
c33104f0
TW		 1954 lq_sta->stay_in_tbl = 0; /* only place reset */
1955 lq_sta->total_failed = 0;
1956 lq_sta->total_success = 0;
1957 lq_sta->flush_timer = 0;
77626355
BC		 1958
1959 /*
1960 * Else if we've used this modulation mode enough repetitions
1961 * (regardless of elapsed time or success/failure), reset
1962 * history bitmaps and rate-specific stats for all rates in
1963 * active table.
1964 */
403ab56b 1965 } else {
c33104f0
TW		 1966 lq_sta->table_count++;
1967 if (lq_sta->table_count >=
1968 lq_sta->table_count_limit) {
1969 lq_sta->table_count = 0;
b481de9c 1970
e1623446 1971 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
b481de9c
ZY		 1972 for (i = 0; i < IWL_RATE_COUNT; i++)
1973 rs_rate_scale_clear_window(
1974 &(tbl->win[i]));
1975 }
1976 }
1977
77626355
BC		 1978 /* If transitioning to allow "search", reset all history
1979 * bitmaps and stats in active table (this will become the new
1980 * "search" table). */
c33104f0 1981 if (!lq_sta->stay_in_tbl) {
b481de9c
ZY		 1982 for (i = 0; i < IWL_RATE_COUNT; i++)
1983 rs_rate_scale_clear_window(&(tbl->win[i]));
1984 }
1985 }
1986}
1987
e3139fe7
WYG		 1988/*
1989 * setup rate table in uCode
1990 * return rate_n_flags as used in the table
1991 */
1992static u32 rs_update_rate_tbl(struct iwl_priv *priv,
1993 struct iwl_lq_sta *lq_sta,
1994 struct iwl_scale_tbl_info *tbl,
1995 int index, u8 is_green)
1996{
1997 u32 rate;
1998
1999 /* Update uCode's rate table. */
2000 rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2001 rs_fill_link_cmd(priv, lq_sta, rate);
2002 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2003
2004 return rate;
2005}
2006
77626355
BC		 2007/*
2008 * Do rate scaling and search for new modulation mode.
2009 */
c79dd5b5 2010static void rs_rate_scale_perform(struct iwl_priv *priv,
514d65c1 2011 struct sk_buff *skb,
4b7679a5
JB		 2012 struct ieee80211_sta *sta,
2013 struct iwl_lq_sta *lq_sta)
b481de9c 2014{
4b7679a5 2015 struct ieee80211_hw *hw = priv->hw;
270243a5 2016 struct ieee80211_conf *conf = &hw->conf;
514d65c1
GS		 2017 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2018 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
b481de9c
ZY		 2019 int low = IWL_RATE_INVALID;
2020 int high = IWL_RATE_INVALID;
2021 int index;
2022 int i;
e227ceac 2023 struct iwl_rate_scale_data *window = NULL;
b481de9c
ZY		 2024 int current_tpt = IWL_INVALID_VALUE;
2025 int low_tpt = IWL_INVALID_VALUE;
2026 int high_tpt = IWL_INVALID_VALUE;
2027 u32 fail_count;
2028 s8 scale_action = 0;
fd7c8a40 2029 u16 rate_mask;
b481de9c 2030 u8 update_lq = 0;
e227ceac 2031 struct iwl_scale_tbl_info *tbl, *tbl1;
b481de9c 2032 u16 rate_scale_index_msk = 0;
39e88504 2033 u32 rate;
b481de9c
ZY		 2034 u8 is_green = 0;
2035 u8 active_tbl = 0;
2036 u8 done_search = 0;
2037 u16 high_low;
a5e8b505 2038 s32 sr;
0c11b4de 2039 u8 tid = MAX_TID_COUNT;
86b4766b 2040 struct iwl_tid_data *tid_data;
b481de9c 2041
e1623446 2042 IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
b481de9c 2043
514d65c1 2044 /* Send management frames and NO_ACK data using lowest rate. */
417f114b
TW		 2045 /* TODO: this could probably be improved.. */
2046 if (!ieee80211_is_data(hdr->frame_control) ||
514d65c1 2047 info->flags & IEEE80211_TX_CTL_NO_ACK)
b481de9c 2048 return;
b481de9c 2049
4b7679a5 2050 if (!sta || !lq_sta)
b481de9c
ZY		 2051 return;
2052
4b7679a5 2053 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
b481de9c 2054
faa29718
RR		 2055 tid = rs_tl_add_packet(lq_sta, hdr);
2056
77626355
BC		 2057 /*
2058 * Select rate-scale / modulation-mode table to work with in
2059 * the rest of this function: "search" if searching for better
2060 * modulation mode, or "active" if doing rate scaling within a mode.
2061 */
c33104f0
TW		 2062 if (!lq_sta->search_better_tbl)
2063 active_tbl = lq_sta->active_tbl;
b481de9c 2064 else
c33104f0 2065 active_tbl = 1 - lq_sta->active_tbl;
b481de9c 2066
c33104f0 2067 tbl = &(lq_sta->lq_info[active_tbl]);
2681b20b
WYG		 2068 if (is_legacy(tbl->lq_type))
2069 lq_sta->is_green = 0;
2070 else
b261793d 2071 lq_sta->is_green = rs_use_green(sta, &priv->current_ht_config);
c33104f0 2072 is_green = lq_sta->is_green;
b481de9c 2073
77626355 2074 /* current tx rate */
b7e35008 2075 index = lq_sta->last_txrate_idx;
b481de9c 2076
e1623446 2077 IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
b481de9c
ZY		 2078 tbl->lq_type);
2079
77626355 2080 /* rates available for this association, and for modulation mode */
eecd6e57 2081 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
b481de9c 2082
e1623446 2083 IWL_DEBUG_RATE(priv, "mask 0x%04X \n", rate_mask);
b481de9c
ZY		 2084
2085 /* mask with station rate restriction */
2086 if (is_legacy(tbl->lq_type)) {
8318d78a 2087 if (lq_sta->band == IEEE80211_BAND_5GHZ)
77626355 2088 /* supp_rates has no CCK bits in A mode */
b481de9c 2089 rate_scale_index_msk = (u16) (rate_mask &
c33104f0 2090 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
b481de9c
ZY		 2091 else
2092 rate_scale_index_msk = (u16) (rate_mask &
c33104f0 2093 lq_sta->supp_rates);
b481de9c
ZY		 2094
2095 } else
2096 rate_scale_index_msk = rate_mask;
2097
2098 if (!rate_scale_index_msk)
2099 rate_scale_index_msk = rate_mask;
2100
07bc28ed 2101 if (!((1 << index) & rate_scale_index_msk)) {
15b1687c 2102 IWL_ERR(priv, "Current Rate is not valid\n");
e3139fe7
WYG		 2103 if (lq_sta->search_better_tbl) {
2104 /* revert to active table if search table is not valid*/
2105 tbl->lq_type = LQ_NONE;
2106 lq_sta->search_better_tbl = 0;
2107 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2108 /* get "active" rate info */
2109 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2110 rate = rs_update_rate_tbl(priv, lq_sta,
2111 tbl, index, is_green);
2112 }
07bc28ed 2113 return;
b481de9c
ZY		 2114 }
2115
77626355 2116 /* Get expected throughput table and history window for current rate */
07bc28ed 2117 if (!tbl->expected_tpt) {
15b1687c 2118 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
07bc28ed
GC		 2119 return;
2120 }
b481de9c 2121
c6ec7a9b
AM		 2122 /* force user max rate if set by user */
2123 if ((lq_sta->max_rate_idx != -1) &&
2124 (lq_sta->max_rate_idx < index)) {
2125 index = lq_sta->max_rate_idx;
2126 update_lq = 1;
2127 window = &(tbl->win[index]);
2128 goto lq_update;
2129 }
2130
b481de9c
ZY		 2131 window = &(tbl->win[index]);
2132
77626355
BC		 2133 /*
2134 * If there is not enough history to calculate actual average
2135 * throughput, keep analyzing results of more tx frames, without
2136 * changing rate or mode (bypass most of the rest of this function).
2137 * Set up new rate table in uCode only if old rate is not supported
2138 * in current association (use new rate found above).
2139 */
b481de9c 2140 fail_count = window->counter - window->success_counter;
07bc28ed
GC		 2141 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2142 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
e1623446 2143 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
b481de9c
ZY		 2144 "for index %d\n",
2145 window->success_counter, window->counter, index);
77626355
BC		 2146
2147 /* Can't calculate this yet; not enough history */
b481de9c 2148 window->average_tpt = IWL_INVALID_VALUE;
77626355
BC		 2149
2150 /* Should we stay with this modulation mode,
2151 * or search for a new one? */
c33104f0 2152 rs_stay_in_table(lq_sta);
77626355 2153
b481de9c 2154 goto out;
3110bef7 2155 }
b481de9c 2156
77626355
BC		 2157 /* Else we have enough samples; calculate estimate of
2158 * actual average throughput */
3110bef7
GC		 2159
2160 BUG_ON(window->average_tpt != ((window->success_ratio *
2161 tbl->expected_tpt[index] + 64) / 128));
b481de9c 2162
77626355 2163 /* If we are searching for better modulation mode, check success. */
46f9381a 2164 if (lq_sta->search_better_tbl &&
3ad3b92a 2165 (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
77626355
BC		 2166 /* If good success, continue using the "search" mode;
2167 * no need to send new link quality command, since we're
2168 * continuing to use the setup that we've been trying. */
07bc28ed
GC		 2169 if (window->average_tpt > lq_sta->last_tpt) {
2170
e1623446 2171 IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
07bc28ed
GC		 2172 "suc=%d cur-tpt=%d old-tpt=%d\n",
2173 window->success_ratio,
2174 window->average_tpt,
2175 lq_sta->last_tpt);
2176
2177 if (!is_legacy(tbl->lq_type))
c33104f0 2178 lq_sta->enable_counter = 1;
07bc28ed 2179
77626355 2180 /* Swap tables; "search" becomes "active" */
c33104f0 2181 lq_sta->active_tbl = active_tbl;
b481de9c 2182 current_tpt = window->average_tpt;
77626355
BC		 2183
2184 /* Else poor success; go back to mode in "active" table */
b481de9c 2185 } else {
07bc28ed 2186
e1623446 2187 IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
07bc28ed
GC		 2188 "suc=%d cur-tpt=%d old-tpt=%d\n",
2189 window->success_ratio,
2190 window->average_tpt,
2191 lq_sta->last_tpt);
2192
77626355 2193 /* Nullify "search" table */
b481de9c 2194 tbl->lq_type = LQ_NONE;
77626355
BC		 2195
2196 /* Revert to "active" table */
c33104f0
TW		 2197 active_tbl = lq_sta->active_tbl;
2198 tbl = &(lq_sta->lq_info[active_tbl]);
b481de9c 2199
77626355 2200 /* Revert to "active" rate and throughput info */
e7d326ac 2201 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
c33104f0 2202 current_tpt = lq_sta->last_tpt;
b481de9c 2203
77626355 2204 /* Need to set up a new rate table in uCode */
b481de9c 2205 update_lq = 1;
b481de9c 2206 }
77626355
BC		 2207
2208 /* Either way, we've made a decision; modulation mode
2209 * search is done, allow rate adjustment next time. */
c33104f0 2210 lq_sta->search_better_tbl = 0;
77626355 2211 done_search = 1; /* Don't switch modes below! */
b481de9c
ZY		 2212 goto lq_update;
2213 }
2214
77626355
BC		 2215 /* (Else) not in search of better modulation mode, try for better
2216 * starting rate, while staying in this mode. */
bf403db8 2217 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
b481de9c
ZY		 2218 tbl->lq_type);
2219 low = high_low & 0xff;
2220 high = (high_low >> 8) & 0xff;
2221
c6ec7a9b
AM		 2222 /* If user set max rate, dont allow higher than user constrain */
2223 if ((lq_sta->max_rate_idx != -1) &&
2224 (lq_sta->max_rate_idx < high))
2225 high = IWL_RATE_INVALID;
2226
a5e8b505
GC		 2227 sr = window->success_ratio;
2228
77626355 2229 /* Collect measured throughputs for current and adjacent rates */
b481de9c 2230 current_tpt = window->average_tpt;
b481de9c
ZY		 2231 if (low != IWL_RATE_INVALID)
2232 low_tpt = tbl->win[low].average_tpt;
b481de9c
ZY		 2233 if (high != IWL_RATE_INVALID)
2234 high_tpt = tbl->win[high].average_tpt;
2235
a5e8b505 2236 scale_action = 0;
b481de9c 2237
77626355 2238 /* Too many failures, decrease rate */
a5e8b505 2239 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
e1623446 2240 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
b481de9c 2241 scale_action = -1;
77626355
BC		 2242
2243 /* No throughput measured yet for adjacent rates; try increase. */
b481de9c 2244 } else if ((low_tpt == IWL_INVALID_VALUE) &&
a5e8b505
GC		 2245 (high_tpt == IWL_INVALID_VALUE)) {
2246
2247 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2248 scale_action = 1;
2249 else if (low != IWL_RATE_INVALID)
8fe72311 2250 scale_action = 0;
a5e8b505 2251 }
77626355
BC		 2252
2253 /* Both adjacent throughputs are measured, but neither one has better
2254 * throughput; we're using the best rate, don't change it! */
b481de9c
ZY		 2255 else if ((low_tpt != IWL_INVALID_VALUE) &&
2256 (high_tpt != IWL_INVALID_VALUE) &&
2257 (low_tpt < current_tpt) &&
2258 (high_tpt < current_tpt))
2259 scale_action = 0;
77626355
BC		 2260
2261 /* At least one adjacent rate's throughput is measured,
2262 * and may have better performance. */
b481de9c 2263 else {
77626355 2264 /* Higher adjacent rate's throughput is measured */
b481de9c 2265 if (high_tpt != IWL_INVALID_VALUE) {
77626355 2266 /* Higher rate has better throughput */
a5e8b505
GC		 2267 if (high_tpt > current_tpt &&
2268 sr >= IWL_RATE_INCREASE_TH) {
b481de9c 2269 scale_action = 1;
a5e8b505 2270 } else {
8fe72311 2271 scale_action = 0;
b481de9c 2272 }
77626355
BC		 2273
2274 /* Lower adjacent rate's throughput is measured */
b481de9c 2275 } else if (low_tpt != IWL_INVALID_VALUE) {
77626355 2276 /* Lower rate has better throughput */
b481de9c 2277 if (low_tpt > current_tpt) {
e1623446
TW		 2278 IWL_DEBUG_RATE(priv,
2279 "decrease rate because of low tpt\n");
b481de9c 2280 scale_action = -1;
a5e8b505 2281 } else if (sr >= IWL_RATE_INCREASE_TH) {
b481de9c 2282 scale_action = 1;
a5e8b505 2283 }
b481de9c
ZY		 2284 }
2285 }
2286
77626355
BC		 2287 /* Sanity check; asked for decrease, but success rate or throughput
2288 * has been good at old rate. Don't change it. */
a5e8b505
GC		 2289 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2290 ((sr > IWL_RATE_HIGH_TH) ||
b481de9c 2291 (current_tpt > (100 * tbl->expected_tpt[low]))))
b481de9c 2292 scale_action = 0;
46f9381a
WYG		 2293 if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2294 scale_action = -1;
3ad3b92a 2295 if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
46f9381a
WYG		 2296 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2297 scale_action = -1;
b481de9c
ZY		 2298 switch (scale_action) {
2299 case -1:
77626355 2300 /* Decrease starting rate, update uCode's rate table */
b481de9c
ZY		 2301 if (low != IWL_RATE_INVALID) {
2302 update_lq = 1;
2303 index = low;
2304 }
447fee70 2305
b481de9c
ZY		 2306 break;
2307 case 1:
77626355 2308 /* Increase starting rate, update uCode's rate table */
b481de9c
ZY		 2309 if (high != IWL_RATE_INVALID) {
2310 update_lq = 1;
2311 index = high;
2312 }
2313
2314 break;
2315 case 0:
77626355 2316 /* No change */
b481de9c
ZY		 2317 default:
2318 break;
2319 }
2320
e1623446 2321 IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
b481de9c
ZY		 2322 "high %d type %d\n",
2323 index, scale_action, low, high, tbl->lq_type);
2324
a5e8b505 2325lq_update:
77626355 2326 /* Replace uCode's rate table for the destination station. */
e3139fe7
WYG		 2327 if (update_lq)
2328 rate = rs_update_rate_tbl(priv, lq_sta,
2329 tbl, index, is_green);
77626355 2330
3ad3b92a 2331 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
46f9381a
WYG		 2332 /* Should we stay with this modulation mode,
2333 * or search for a new one? */
2334 rs_stay_in_table(lq_sta);
2335 }
77626355
BC		 2336 /*
2337 * Search for new modulation mode if we're:
2338 * 1) Not changing rates right now
2339 * 2) Not just finishing up a search
2340 * 3) Allowing a new search
2341 */
47cfd463 2342 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
77626355 2343 /* Save current throughput to compare with "search" throughput*/
c33104f0 2344 lq_sta->last_tpt = current_tpt;
b481de9c 2345
77626355
BC		 2346 /* Select a new "search" modulation mode to try.
2347 * If one is found, set up the new "search" table. */
b481de9c 2348 if (is_legacy(tbl->lq_type))
c33104f0 2349 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
b481de9c 2350 else if (is_siso(tbl->lq_type))
c33104f0 2351 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
584a0f00
WYG		 2352 else if (is_mimo2(tbl->lq_type))
2353 rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
b481de9c 2354 else
584a0f00 2355 rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
b481de9c 2356
77626355 2357 /* If new "search" mode was selected, set up in uCode table */
c33104f0 2358 if (lq_sta->search_better_tbl) {
77626355 2359 /* Access the "search" table, clear its history. */
c33104f0 2360 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
b481de9c
ZY		 2361 for (i = 0; i < IWL_RATE_COUNT; i++)
2362 rs_rate_scale_clear_window(&(tbl->win[i]));
2363
77626355 2364 /* Use new "search" start rate */
e7d326ac 2365 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
b481de9c 2366
e1623446 2367 IWL_DEBUG_RATE(priv, "Switch current mcs: %X index: %d\n",
39e88504 2368 tbl->current_rate, index);
07bc28ed 2369 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
66c73db7 2370 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
447fee70
MA		 2371 } else
2372 done_search = 1;
2373 }
b481de9c 2374
447fee70 2375 if (done_search && !lq_sta->stay_in_tbl) {
77626355
BC		 2376 /* If the "active" (non-search) mode was legacy,
2377 * and we've tried switching antennas,
2378 * but we haven't been able to try HT modes (not available),
2379 * stay with best antenna legacy modulation for a while
2380 * before next round of mode comparisons. */
c33104f0 2381 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
de27e64e 2382 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
d6e93399 2383 lq_sta->action_counter > tbl1->max_search) {
e1623446 2384 IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
bf403db8 2385 rs_set_stay_in_table(priv, 1, lq_sta);
b481de9c
ZY		 2386 }
2387
77626355
BC		 2388 /* If we're in an HT mode, and all 3 mode switch actions
2389 * have been tried and compared, stay in this best modulation
2390 * mode for a while before next round of mode comparisons. */
c33104f0 2391 if (lq_sta->enable_counter &&
46f9381a
WYG		 2392 (lq_sta->action_counter >= tbl1->max_search) &&
2393 iwl_ht_enabled(priv)) {
0c11b4de
RR		 2394 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2395 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2396 (tid != MAX_TID_COUNT)) {
86b4766b
WYG		 2397 tid_data =
2398 &priv->stations[lq_sta->lq.sta_id].tid[tid];
2399 if (tid_data->agg.state == IWL_AGG_OFF) {
2400 IWL_DEBUG_RATE(priv,
2401 "try to aggregate tid %d\n",
2402 tid);
2403 rs_tl_turn_on_agg(priv, tid,
2404 lq_sta, sta);
2405 }
b481de9c 2406 }
bf403db8 2407 rs_set_stay_in_table(priv, 0, lq_sta);
b481de9c 2408 }
b481de9c
ZY		 2409 }
2410
2411out:
978785a3 2412 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
b481de9c 2413 i = index;
b7e35008 2414 lq_sta->last_txrate_idx = i;
b481de9c 2415
b481de9c
ZY		 2416 return;
2417}
2418
2419
c79dd5b5 2420static void rs_initialize_lq(struct iwl_priv *priv,
270243a5 2421 struct ieee80211_conf *conf,
4b7679a5
JB		 2422 struct ieee80211_sta *sta,
2423 struct iwl_lq_sta *lq_sta)
b481de9c 2424{
e227ceac 2425 struct iwl_scale_tbl_info *tbl;
b481de9c 2426 int rate_idx;
aade00ce 2427 int i;
39e88504 2428 u32 rate;
b261793d 2429 u8 use_green = rs_use_green(sta, &priv->current_ht_config);
aade00ce
GC		 2430 u8 active_tbl = 0;
2431 u8 valid_tx_ant;
b481de9c 2432
4b7679a5 2433 if (!sta || !lq_sta)
b481de9c
ZY		 2434 goto out;
2435
b7e35008 2436 i = lq_sta->last_txrate_idx;
b481de9c 2437
c33104f0 2438 if ((lq_sta->lq.sta_id == 0xff) &&
05c914fe 2439 (priv->iw_mode == NL80211_IFTYPE_ADHOC))
b481de9c
ZY		 2440 goto out;
2441
aade00ce
GC		 2442 valid_tx_ant = priv->hw_params.valid_tx_ant;
2443
c33104f0
TW		 2444 if (!lq_sta->search_better_tbl)
2445 active_tbl = lq_sta->active_tbl;
b481de9c 2446 else
c33104f0 2447 active_tbl = 1 - lq_sta->active_tbl;
b481de9c 2448
c33104f0 2449 tbl = &(lq_sta->lq_info[active_tbl]);
b481de9c
ZY		 2450
2451 if ((i < 0) || (i >= IWL_RATE_COUNT))
2452 i = 0;
2453
1826dcc0 2454 rate = iwl_rates[i].plcp;
eb48dcaf
WT		 2455 tbl->ant_type = first_antenna(valid_tx_ant);
2456 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
b481de9c
ZY		 2457
2458 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
39e88504 2459 rate |= RATE_MCS_CCK_MSK;
b481de9c 2460
39e88504 2461 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
aade00ce
GC		 2462 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2463 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
b481de9c 2464
978785a3 2465 rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
39e88504 2466 tbl->current_rate = rate;
eecd6e57 2467 rs_set_expected_tpt_table(lq_sta, tbl);
07bc28ed 2468 rs_fill_link_cmd(NULL, lq_sta, rate);
66c73db7 2469 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
b481de9c
ZY		 2470 out:
2471 return;
2472}
2473
e6a9854b
JB		 2474static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2475 struct ieee80211_tx_rate_control *txrc)
b481de9c
ZY		 2476{
2477
e6a9854b
JB		 2478 struct sk_buff *skb = txrc->skb;
2479 struct ieee80211_supported_band *sband = txrc->sband;
4b7679a5
JB		 2480 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2481 struct ieee80211_conf *conf = &priv->hw->conf;
7869b0ea 2482 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
b481de9c 2483 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
e6a9854b 2484 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
417f114b
TW		 2485 struct iwl_lq_sta *lq_sta = priv_sta;
2486 int rate_idx;
b481de9c 2487
e1623446 2488 IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
b481de9c 2489
c6ec7a9b
AM		 2490 /* Get max rate if user set max rate */
2491 if (lq_sta) {
2492 lq_sta->max_rate_idx = txrc->max_rate_idx;
2493 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2494 (lq_sta->max_rate_idx != -1))
2495 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2496 if ((lq_sta->max_rate_idx < 0) ||
2497 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2498 lq_sta->max_rate_idx = -1;
2499 }
2500
514d65c1 2501 /* Send management frames and NO_ACK data using lowest rate. */
4c6d4f5c 2502 if (rate_control_send_low(sta, priv_sta, txrc))
4b7679a5 2503 return;
b481de9c 2504
417f114b 2505 rate_idx = lq_sta->last_txrate_idx;
b481de9c 2506
05c914fe 2507 if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
c33104f0 2508 !lq_sta->ibss_sta_added) {
c587de0b 2509 u8 sta_id = iwl_find_station(priv, hdr->addr1);
b481de9c
ZY		 2510
2511 if (sta_id == IWL_INVALID_STATION) {
e1623446 2512 IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n",
e174961c 2513 hdr->addr1);
c587de0b 2514 sta_id = iwl_add_station(priv, hdr->addr1,
7869b0ea 2515 false, CMD_ASYNC, ht_cap);
b481de9c
ZY		 2516 }
2517 if ((sta_id != IWL_INVALID_STATION)) {
c33104f0
TW		 2518 lq_sta->lq.sta_id = sta_id;
2519 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2520 lq_sta->ibss_sta_added = 1;
4b7679a5 2521 rs_initialize_lq(priv, conf, sta, lq_sta);
b481de9c 2522 }
b481de9c
ZY		 2523 }
2524
a9c146b3 2525 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
417f114b 2526 rate_idx -= IWL_FIRST_OFDM_RATE;
a9c146b3
WYG		 2527 /* 6M and 9M shared same MCS index */
2528 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2529 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2530 IWL_RATE_MIMO3_6M_PLCP)
2531 rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2532 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2533 IWL_RATE_MIMO2_6M_PLCP)
2534 rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2535 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2536 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2537 info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2538 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2539 info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
7aafef1c 2540 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
a9c146b3
WYG		 2541 info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2542 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2543 info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2544 } else {
2545 if (rate_idx < 0 || rate_idx > IWL_RATE_COUNT)
2546 rate_idx = rate_lowest_index(sband, sta);
2547 else if (sband->band == IEEE80211_BAND_5GHZ)
2548 rate_idx -= IWL_FIRST_OFDM_RATE;
7ebaeff8 2549 info->control.rates[0].flags = 0;
a9c146b3 2550 }
417f114b 2551 info->control.rates[0].idx = rate_idx;
a9c146b3 2552
b481de9c
ZY		 2553}
2554
4b7679a5
JB		 2555static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2556 gfp_t gfp)
b481de9c 2557{
e227ceac 2558 struct iwl_lq_sta *lq_sta;
bf403db8 2559 struct iwl_priv *priv;
b481de9c
ZY		 2560 int i, j;
2561
bf403db8 2562 priv = (struct iwl_priv *)priv_rate;
e1623446 2563 IWL_DEBUG_RATE(priv, "create station rate scale window\n");
b481de9c 2564
e227ceac 2565 lq_sta = kzalloc(sizeof(struct iwl_lq_sta), gfp);
b481de9c 2566
c33104f0 2567 if (lq_sta == NULL)
b481de9c 2568 return NULL;
c33104f0 2569 lq_sta->lq.sta_id = 0xff;
b481de9c 2570
63fddb9f 2571
b481de9c
ZY		 2572 for (j = 0; j < LQ_SIZE; j++)
2573 for (i = 0; i < IWL_RATE_COUNT; i++)
3ac7f146 2574 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
b481de9c 2575
c33104f0 2576 return lq_sta;
b481de9c
ZY		 2577}
2578
4b7679a5
JB		 2579static void rs_rate_init(void *priv_r, struct ieee80211_supported_band *sband,
2580 struct ieee80211_sta *sta, void *priv_sta)
b481de9c
ZY		 2581{
2582 int i, j;
4b7679a5
JB		 2583 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2584 struct ieee80211_conf *conf = &priv->hw->conf;
7869b0ea 2585 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
e227ceac 2586 struct iwl_lq_sta *lq_sta = priv_sta;
d5e49036 2587 u16 mask_bit = 0;
7d049e5a
AM		 2588 int count;
2589 int start_rate = 0;
b481de9c 2590
c33104f0 2591 lq_sta->flush_timer = 0;
4b7679a5 2592 lq_sta->supp_rates = sta->supp_rates[sband->band];
b481de9c
ZY		 2593 for (j = 0; j < LQ_SIZE; j++)
2594 for (i = 0; i < IWL_RATE_COUNT; i++)
3ac7f146 2595 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
b481de9c 2596
e1623446 2597 IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init ***\n");
b481de9c
ZY		 2598 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2599 * the lowest or the highest rate.. Could consider using RSSI from
2600 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2601 * after assoc.. */
2602
c33104f0 2603 lq_sta->ibss_sta_added = 0;
05c914fe 2604 if (priv->iw_mode == NL80211_IFTYPE_AP) {
c587de0b 2605 u8 sta_id = iwl_find_station(priv,
e11bc028 2606 sta->addr);
0795af57 2607
b481de9c 2608 /* for IBSS the call are from tasklet */
e1623446 2609 IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n", sta->addr);
b481de9c
ZY		 2610
2611 if (sta_id == IWL_INVALID_STATION) {
e1623446 2612 IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n", sta->addr);
c587de0b 2613 sta_id = iwl_add_station(priv, sta->addr, false,
7869b0ea 2614 CMD_ASYNC, ht_cap);
b481de9c
ZY		 2615 }
2616 if ((sta_id != IWL_INVALID_STATION)) {
c33104f0
TW		 2617 lq_sta->lq.sta_id = sta_id;
2618 lq_sta->lq.rs_table[0].rate_n_flags = 0;
b481de9c
ZY		 2619 }
2620 /* FIXME: this is w/a remove it later */
2621 priv->assoc_station_added = 1;
2622 }
2623
c33104f0 2624 lq_sta->is_dup = 0;
c6ec7a9b 2625 lq_sta->max_rate_idx = -1;
7d049e5a 2626 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
b261793d 2627 lq_sta->is_green = rs_use_green(sta, &priv->current_ht_config);
39e88504 2628 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
c33104f0 2629 lq_sta->active_rate_basic = priv->active_rate_basic;
8318d78a 2630 lq_sta->band = priv->band;
77626355
BC		 2631 /*
2632 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2633 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2634 */
7869b0ea
DH		 2635 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2636 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
c33104f0 2637 lq_sta->active_siso_rate &= ~((u16)0x2);
fde0db31 2638 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
b481de9c 2639
77626355 2640 /* Same here */
7869b0ea
DH		 2641 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2642 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
fde0db31
GC		 2643 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2644 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2645
7869b0ea
DH		 2646 lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2647 lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
fde0db31
GC		 2648 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2649 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2650
e1623446 2651 IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
c33104f0 2652 lq_sta->active_siso_rate,
fde0db31
GC		 2653 lq_sta->active_mimo2_rate,
2654 lq_sta->active_mimo3_rate);
2655
a96a27f9 2656 /* These values will be overridden later */
07bc28ed
GC		 2657 lq_sta->lq.general_params.single_stream_ant_msk = ANT_A;
2658 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2659
0c11b4de
RR		 2660 /* as default allow aggregation for all tids */
2661 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
c33104f0 2662 lq_sta->drv = priv;
b481de9c 2663
d5e49036 2664 /* Find highest tx rate supported by hardware and destination station */
7d049e5a
AM		 2665 mask_bit = sta->supp_rates[sband->band];
2666 count = sband->n_bitrates;
2667 if (sband->band == IEEE80211_BAND_5GHZ) {
2668 count += IWL_FIRST_OFDM_RATE;
2669 start_rate = IWL_FIRST_OFDM_RATE;
2670 mask_bit <<= IWL_FIRST_OFDM_RATE;
2671 }
2672
2673 mask_bit = mask_bit & lq_sta->active_legacy_rate;
2674 lq_sta->last_txrate_idx = 4;
2675 for (i = start_rate; i < count; i++)
d5e49036
MA		 2676 if (mask_bit & BIT(i))
2677 lq_sta->last_txrate_idx = i;
2678
4b7679a5 2679 rs_initialize_lq(priv, conf, sta, lq_sta);
b481de9c
ZY		 2680}
2681
46f9381a 2682static void rs_fill_link_cmd(struct iwl_priv *priv,
e227ceac 2683 struct iwl_lq_sta *lq_sta, u32 new_rate)
b481de9c 2684{
e227ceac 2685 struct iwl_scale_tbl_info tbl_type;
b481de9c 2686 int index = 0;
b481de9c 2687 int rate_idx;
1b696de2 2688 int repeat_rate = 0;
aade00ce 2689 u8 ant_toggle_cnt = 0;
b481de9c 2690 u8 use_ht_possible = 1;
aade00ce 2691 u8 valid_tx_ant = 0;
07bc28ed 2692 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
b481de9c 2693
77626355 2694 /* Override starting rate (index 0) if needed for debug purposes */
39e88504 2695 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
98d7e09a 2696
39e88504 2697 /* Interpret new_rate (rate_n_flags) */
aade00ce 2698 memset(&tbl_type, 0, sizeof(tbl_type));
39e88504 2699 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
b481de9c
ZY		 2700 &tbl_type, &rate_idx);
2701
77626355 2702 /* How many times should we repeat the initial rate? */
b481de9c 2703 if (is_legacy(tbl_type.lq_type)) {
aade00ce 2704 ant_toggle_cnt = 1;
1b696de2 2705 repeat_rate = IWL_NUMBER_TRY;
aade00ce 2706 } else {
1b696de2 2707 repeat_rate = IWL_HT_NUMBER_TRY;
aade00ce 2708 }
b481de9c
ZY		 2709
2710 lq_cmd->general_params.mimo_delimiter =
2711 is_mimo(tbl_type.lq_type) ? 1 : 0;
77626355
BC		 2712
2713 /* Fill 1st table entry (index 0) */
39e88504 2714 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
b481de9c 2715
07bc28ed
GC		 2716 if (num_of_ant(tbl_type.ant_type) == 1) {
2717 lq_cmd->general_params.single_stream_ant_msk =
2718 tbl_type.ant_type;
2719 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2720 lq_cmd->general_params.dual_stream_ant_msk =
2721 tbl_type.ant_type;
2722 } /* otherwise we don't modify the existing value */
b481de9c
ZY		 2723
2724 index++;
1b696de2 2725 repeat_rate--;
b481de9c 2726
aade00ce
GC		 2727 if (priv)
2728 valid_tx_ant = priv->hw_params.valid_tx_ant;
2729
77626355 2730 /* Fill rest of rate table */
b481de9c 2731 while (index < LINK_QUAL_MAX_RETRY_NUM) {
77626355
BC		 2732 /* Repeat initial/next rate.
2733 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2734 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
1b696de2 2735 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
b481de9c 2736 if (is_legacy(tbl_type.lq_type)) {
aade00ce
GC		 2737 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2738 ant_toggle_cnt++;
2739 else if (priv &&
2740 rs_toggle_antenna(valid_tx_ant,
2741 &new_rate, &tbl_type))
2742 ant_toggle_cnt = 1;
2743}
98d7e09a 2744
77626355 2745 /* Override next rate if needed for debug purposes */
c33104f0 2746 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
77626355
BC		 2747
2748 /* Fill next table entry */
b481de9c 2749 lq_cmd->rs_table[index].rate_n_flags =
39e88504 2750 cpu_to_le32(new_rate);
1b696de2 2751 repeat_rate--;
b481de9c
ZY		 2752 index++;
2753 }
2754
39e88504 2755 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
b481de9c
ZY		 2756 &rate_idx);
2757
77626355
BC		 2758 /* Indicate to uCode which entries might be MIMO.
2759 * If initial rate was MIMO, this will finally end up
2760 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
b481de9c
ZY		 2761 if (is_mimo(tbl_type.lq_type))
2762 lq_cmd->general_params.mimo_delimiter = index;
2763
77626355 2764 /* Get next rate */
39e88504
GC		 2765 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2766 use_ht_possible);
b481de9c 2767
77626355 2768 /* How many times should we repeat the next rate? */
b481de9c 2769 if (is_legacy(tbl_type.lq_type)) {
aade00ce
GC		 2770 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2771 ant_toggle_cnt++;
2772 else if (priv &&
2773 rs_toggle_antenna(valid_tx_ant,
2774 &new_rate, &tbl_type))
2775 ant_toggle_cnt = 1;
2776
1b696de2 2777 repeat_rate = IWL_NUMBER_TRY;
aade00ce 2778 } else {
1b696de2 2779 repeat_rate = IWL_HT_NUMBER_TRY;
aade00ce 2780 }
b481de9c 2781
77626355
BC		 2782 /* Don't allow HT rates after next pass.
2783 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
b481de9c
ZY		 2784 use_ht_possible = 0;
2785
77626355 2786 /* Override next rate if needed for debug purposes */
c33104f0 2787 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
77626355
BC		 2788
2789 /* Fill next table entry */
39e88504 2790 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
b481de9c
ZY		 2791
2792 index++;
1b696de2 2793 repeat_rate--;
b481de9c
ZY		 2794 }
2795
13c33a09
WYG		 2796 lq_cmd->agg_params.agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_MAX;
2797 lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2798 lq_cmd->agg_params.agg_time_limit =
2799 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
b481de9c
ZY		 2800}
2801
4b7679a5 2802static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
b481de9c 2803{
4b7679a5 2804 return hw->priv;
b481de9c
ZY		 2805}
2806/* rate scale requires free function to be implemented */
2807static void rs_free(void *priv_rate)
2808{
2809 return;
2810}
2811
4b7679a5
JB		 2812static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
2813 void *priv_sta)
b481de9c 2814{
e227ceac 2815 struct iwl_lq_sta *lq_sta = priv_sta;
45527c2c 2816 struct iwl_priv *priv __maybe_unused = priv_r;
b481de9c 2817
e1623446 2818 IWL_DEBUG_RATE(priv, "enter\n");
c33104f0 2819 kfree(lq_sta);
e1623446 2820 IWL_DEBUG_RATE(priv, "leave\n");
b481de9c
ZY		 2821}
2822
2823
93dc646a 2824#ifdef CONFIG_MAC80211_DEBUGFS
5ae212c9
ZY		 2825static int open_file_generic(struct inode *inode, struct file *file)
2826{
2827 file->private_data = inode->i_private;
2828 return 0;
2829}
e227ceac
TW		 2830static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2831 u32 *rate_n_flags, int index)
98d7e09a 2832{
bf403db8 2833 struct iwl_priv *priv;
3c4955f8
WYG		 2834 u8 valid_tx_ant;
2835 u8 ant_sel_tx;
bf403db8
EK		 2836
2837 priv = lq_sta->drv;
3c4955f8 2838 valid_tx_ant = priv->hw_params.valid_tx_ant;
39e88504 2839 if (lq_sta->dbg_fixed_rate) {
3c4955f8
WYG		 2840 ant_sel_tx =
2841 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
2842 >> RATE_MCS_ANT_POS);
2843 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
39e88504 2844 *rate_n_flags = lq_sta->dbg_fixed_rate;
3c4955f8 2845 IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
39e88504 2846 } else {
3c4955f8
WYG		 2847 lq_sta->dbg_fixed_rate = 0;
2848 IWL_ERR(priv,
2849 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
2850 ant_sel_tx, valid_tx_ant);
2851 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
39e88504 2852 }
39e88504 2853 } else {
e1623446 2854 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
98d7e09a 2855 }
98d7e09a 2856}
5ae212c9 2857
98d7e09a
ZY		 2858static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2859 const char __user *user_buf, size_t count, loff_t *ppos)
2860{
e227ceac 2861 struct iwl_lq_sta *lq_sta = file->private_data;
bf403db8 2862 struct iwl_priv *priv;
98d7e09a
ZY		 2863 char buf[64];
2864 int buf_size;
2865 u32 parsed_rate;
2866
bf403db8 2867 priv = lq_sta->drv;
98d7e09a
ZY		 2868 memset(buf, 0, sizeof(buf));
2869 buf_size = min(count, sizeof(buf) - 1);
2870 if (copy_from_user(buf, user_buf, buf_size))
2871 return -EFAULT;
2872
2873 if (sscanf(buf, "%x", &parsed_rate) == 1)
39e88504 2874 lq_sta->dbg_fixed_rate = parsed_rate;
98d7e09a 2875 else
39e88504 2876 lq_sta->dbg_fixed_rate = 0;
98d7e09a 2877
39e88504
GC		 2878 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2879 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2880 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2881 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
98d7e09a 2882
e1623446 2883 IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
39e88504 2884 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
98d7e09a 2885
39e88504 2886 if (lq_sta->dbg_fixed_rate) {
07bc28ed 2887 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
66c73db7 2888 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
98d7e09a
ZY		 2889 }
2890
2891 return count;
2892}
0209dc11 2893
5ae212c9
ZY		 2894static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2895 char __user *user_buf, size_t count, loff_t *ppos)
2896{
a412c804 2897 char *buff;
5ae212c9
ZY		 2898 int desc = 0;
2899 int i = 0;
12b96817 2900 int index = 0;
a412c804 2901 ssize_t ret;
5ae212c9 2902
e227ceac 2903 struct iwl_lq_sta *lq_sta = file->private_data;
d8ae4f52 2904 struct iwl_priv *priv;
adb7b5e6 2905 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
5ae212c9 2906
d8ae4f52 2907 priv = lq_sta->drv;
a412c804
FS		 2908 buff = kmalloc(1024, GFP_KERNEL);
2909 if (!buff)
2910 return -ENOMEM;
2911
c33104f0 2912 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
98d7e09a 2913 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
c33104f0 2914 lq_sta->total_failed, lq_sta->total_success,
39e88504 2915 lq_sta->active_legacy_rate);
98d7e09a 2916 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
39e88504 2917 lq_sta->dbg_fixed_rate);
d8ae4f52
WYG		 2918 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
2919 (priv->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
2920 (priv->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
2921 (priv->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
adb7b5e6
WYG		 2922 desc += sprintf(buff+desc, "lq type %s\n",
2923 (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
2924 if (is_Ht(tbl->lq_type)) {
2925 desc += sprintf(buff+desc, " %s",
2926 (is_siso(tbl->lq_type)) ? "SISO" :
2927 ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
2928 desc += sprintf(buff+desc, " %s",
7aafef1c 2929 (tbl->is_ht40) ? "40MHz" : "20MHz");
2681b20b
WYG		 2930 desc += sprintf(buff+desc, " %s %s\n", (tbl->is_SGI) ? "SGI" : "",
2931 (lq_sta->is_green) ? "GF enabled" : "");
adb7b5e6 2932 }
12b96817
WYG		 2933 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
2934 lq_sta->last_rate_n_flags);
5ae212c9
ZY		 2935 desc += sprintf(buff+desc, "general:"
2936 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
c33104f0
TW		 2937 lq_sta->lq.general_params.flags,
2938 lq_sta->lq.general_params.mimo_delimiter,
2939 lq_sta->lq.general_params.single_stream_ant_msk,
2940 lq_sta->lq.general_params.dual_stream_ant_msk);
5ae212c9
ZY		 2941
2942 desc += sprintf(buff+desc, "agg:"
2943 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
c33104f0
TW		 2944 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2945 lq_sta->lq.agg_params.agg_dis_start_th,
2946 lq_sta->lq.agg_params.agg_frame_cnt_limit);
5ae212c9
ZY		 2947
2948 desc += sprintf(buff+desc,
2949 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
c33104f0
TW		 2950 lq_sta->lq.general_params.start_rate_index[0],
2951 lq_sta->lq.general_params.start_rate_index[1],
2952 lq_sta->lq.general_params.start_rate_index[2],
2953 lq_sta->lq.general_params.start_rate_index[3]);
5ae212c9 2954
12b96817
WYG		 2955 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2956 index = iwl_hwrate_to_plcp_idx(
2957 le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2958 if (is_legacy(tbl->lq_type)) {
2959 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
2960 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
2961 iwl_rate_mcs[index].mbps);
2962 } else {
2963 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
2964 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
2965 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
2966 }
2967 }
5ae212c9 2968
a412c804
FS		 2969 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2970 kfree(buff);
2971 return ret;
5ae212c9
ZY		 2972}
2973
2974static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
98d7e09a 2975 .write = rs_sta_dbgfs_scale_table_write,
5ae212c9
ZY		 2976 .read = rs_sta_dbgfs_scale_table_read,
2977 .open = open_file_generic,
2978};
0209dc11
ZY		 2979static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2980 char __user *user_buf, size_t count, loff_t *ppos)
2981{
a412c804 2982 char *buff;
0209dc11
ZY		 2983 int desc = 0;
2984 int i, j;
a412c804 2985 ssize_t ret;
0209dc11 2986
e227ceac 2987 struct iwl_lq_sta *lq_sta = file->private_data;
a412c804
FS		 2988
2989 buff = kmalloc(1024, GFP_KERNEL);
2990 if (!buff)
2991 return -ENOMEM;
2992
0209dc11 2993 for (i = 0; i < LQ_SIZE; i++) {
7aafef1c
WYG		 2994 desc += sprintf(buff+desc,
2995 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
0209dc11 2996 "rate=0x%X\n",
c3056065 2997 lq_sta->active_tbl == i ? "*" : "x",
c33104f0
TW		 2998 lq_sta->lq_info[i].lq_type,
2999 lq_sta->lq_info[i].is_SGI,
7aafef1c 3000 lq_sta->lq_info[i].is_ht40,
c33104f0 3001 lq_sta->lq_info[i].is_dup,
2681b20b 3002 lq_sta->is_green,
39e88504 3003 lq_sta->lq_info[i].current_rate);
0209dc11
ZY		 3004 for (j = 0; j < IWL_RATE_COUNT; j++) {
3005 desc += sprintf(buff+desc,
c33104f0
TW		 3006 "counter=%d success=%d %%=%d\n",
3007 lq_sta->lq_info[i].win[j].counter,
3008 lq_sta->lq_info[i].win[j].success_counter,
3009 lq_sta->lq_info[i].win[j].success_ratio);
0209dc11
ZY		 3010 }
3011 }
a412c804
FS		 3012 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3013 kfree(buff);
3014 return ret;
0209dc11
ZY		 3015}
3016
3017static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3018 .read = rs_sta_dbgfs_stats_table_read,
3019 .open = open_file_generic,
3020};
5ae212c9 3021
38167459
WYG		 3022static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3023 char __user *user_buf, size_t count, loff_t *ppos)
3024{
3025 char buff[120];
3026 int desc = 0;
3027 ssize_t ret;
3028
3029 struct iwl_lq_sta *lq_sta = file->private_data;
3030 struct iwl_priv *priv;
3031 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3032
3033 priv = lq_sta->drv;
3034
3035 if (is_Ht(tbl->lq_type))
3036 desc += sprintf(buff+desc,
3037 "Bit Rate= %d Mb/s\n",
3038 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3039 else
3040 desc += sprintf(buff+desc,
3041 "Bit Rate= %d Mb/s\n",
3042 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3043 desc += sprintf(buff+desc,
3044 "Signal Level= %d dBm\tNoise Level= %d dBm\n",
3045 priv->last_rx_rssi, priv->last_rx_noise);
3046 desc += sprintf(buff+desc,
3047 "Tsf= 0x%llx\tBeacon time= 0x%08X\n",
3048 priv->last_tsf, priv->last_beacon_time);
3049
3050 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3051 return ret;
3052}
3053
3054static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3055 .read = rs_sta_dbgfs_rate_scale_data_read,
3056 .open = open_file_generic,
3057};
3058
93dc646a
ZY		 3059static void rs_add_debugfs(void *priv, void *priv_sta,
3060 struct dentry *dir)
3061{
e227ceac 3062 struct iwl_lq_sta *lq_sta = priv_sta;
c33104f0 3063 lq_sta->rs_sta_dbgfs_scale_table_file =
0209dc11 3064 debugfs_create_file("rate_scale_table", 0600, dir,
c33104f0
TW		 3065 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3066 lq_sta->rs_sta_dbgfs_stats_table_file =
0209dc11 3067 debugfs_create_file("rate_stats_table", 0600, dir,
c33104f0 3068 lq_sta, &rs_sta_dbgfs_stats_table_ops);
38167459
WYG		 3069 lq_sta->rs_sta_dbgfs_rate_scale_data_file =
3070 debugfs_create_file("rate_scale_data", 0600, dir,
3071 lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
0c11b4de
RR		 3072 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
3073 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
3074 &lq_sta->tx_agg_tid_en);
0c11b4de 3075
93dc646a
ZY		 3076}
3077
3078static void rs_remove_debugfs(void *priv, void *priv_sta)
3079{
e227ceac 3080 struct iwl_lq_sta *lq_sta = priv_sta;
c33104f0
TW		 3081 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3082 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
38167459 3083 debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
0c11b4de 3084 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
93dc646a
ZY		 3085}
3086#endif
3087
b481de9c
ZY		 3088static struct rate_control_ops rs_ops = {
3089 .module = NULL,
3090 .name = RS_NAME,
3091 .tx_status = rs_tx_status,
3092 .get_rate = rs_get_rate,
3093 .rate_init = rs_rate_init,
b481de9c
ZY		 3094 .alloc = rs_alloc,
3095 .free = rs_free,
3096 .alloc_sta = rs_alloc_sta,
3097 .free_sta = rs_free_sta,
93dc646a
ZY		 3098#ifdef CONFIG_MAC80211_DEBUGFS
3099 .add_sta_debugfs = rs_add_debugfs,
3100 .remove_sta_debugfs = rs_remove_debugfs,
3101#endif
b481de9c
ZY		 3102};
3103
e227ceac 3104int iwlagn_rate_control_register(void)
b481de9c 3105{
897e1cf2 3106 return ieee80211_rate_control_register(&rs_ops);
b481de9c
ZY		 3107}
3108
e227ceac 3109void iwlagn_rate_control_unregister(void)
b481de9c
ZY		 3110{
3111 ieee80211_rate_control_unregister(&rs_ops);
3112}
3113
Linux kernel - Deliverables
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