?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
On Tue, Nov 06, 2007 at 02:33:53AM -0800, akpm@linux-foundation.org wrote:
[mmotm.git] / drivers / net / wireless / iwlwifi / iwl-agn-rs.c
bloba07be29cc5e53995750fc50442ebdc2b935d7d01
1 /******************************************************************************
2 *
3 * Copyright(c) 2005 - 2009 Intel Corporation. All rights reserved.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2 of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
17 *
18 * The full GNU General Public License is included in this distribution in the
19 * file called LICENSE.
20 *
21 * Contact Information:
22 * Intel Linux Wireless <ilw@linux.intel.com>
23 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
24 *
25 *****************************************************************************/
26 #include <linux/kernel.h>
27 #include <linux/init.h>
28 #include <linux/skbuff.h>
29 #include <linux/wireless.h>
30 #include <net/mac80211.h>
31
32 #include <linux/netdevice.h>
33 #include <linux/etherdevice.h>
34 #include <linux/delay.h>
35
36 #include <linux/workqueue.h>
37
38 #include "iwl-dev.h"
39 #include "iwl-sta.h"
40 #include "iwl-core.h"
41
42 #define RS_NAME "iwl-agn-rs"
43
44 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
45 #define IWL_NUMBER_TRY 1
46 #define IWL_HT_NUMBER_TRY 3
47
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
52 /* max allowed rate miss before sync LQ cmd */
53 #define IWL_MISSED_RATE_MAX 15
54 /* max time to accum history 2 seconds */
55 #define IWL_RATE_SCALE_FLUSH_INTVL (3*HZ)
56
57 static 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
67 static 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
78 /**
79 * struct iwl_rate_scale_data -- tx success history for one rate
80 */
81 struct iwl_rate_scale_data {
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 */
87 unsigned long stamp;
88 };
89
90 /**
91 * struct iwl_scale_tbl_info -- tx params and success history for all rates
92 *
93 * There are two of these in struct iwl_lq_sta,
94 * one for "active", and one for "search".
95 */
96 struct iwl_scale_tbl_info {
97 enum iwl_table_type lq_type;
98 u8 ant_type;
99 u8 is_SGI; /* 1 = short guard interval */
100 u8 is_ht40; /* 1 = 40 MHz channel width */
101 u8 is_dup; /* 1 = duplicated data streams */
102 u8 action; /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
103 u8 max_search; /* maximun number of tables we can search */
104 s32 *expected_tpt; /* throughput metrics; expected_tpt_G, etc. */
105 u32 current_rate; /* rate_n_flags, uCode API format */
106 struct iwl_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
107 };
108
109 struct iwl_traffic_load {
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
120 /**
121 * struct iwl_lq_sta -- driver's rate scaling private structure
122 *
123 * Pointer to this gets passed back and forth between driver and mac80211.
124 */
125 struct iwl_lq_sta {
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 */
130 s32 last_tpt;
131
132 /* The following determine when to search for a new mode */
133 u32 table_count_limit;
134 u32 max_failure_limit; /* # failed frames before new search */
135 u32 max_success_limit; /* # successful frames before new search */
136 u32 table_count;
137 u32 total_failed; /* total failed frames, any/all rates */
138 u32 total_success; /* total successful frames, any/all rates */
139 u64 flush_timer; /* time staying in mode before new search */
140
141 u8 action_counter; /* # mode-switch actions tried */
142 u8 is_green;
143 u8 is_dup;
144 enum ieee80211_band band;
145 u8 ibss_sta_added;
146
147 /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
148 u32 supp_rates;
149 u16 active_legacy_rate;
150 u16 active_siso_rate;
151 u16 active_mimo2_rate;
152 u16 active_mimo3_rate;
153 u16 active_rate_basic;
154 s8 max_rate_idx; /* Max rate set by user */
155 u8 missed_rate_counter;
156
157 struct iwl_link_quality_cmd lq;
158 struct iwl_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
159 struct iwl_traffic_load load[TID_MAX_LOAD_COUNT];
160 u8 tx_agg_tid_en;
161 #ifdef CONFIG_MAC80211_DEBUGFS
162 struct dentry *rs_sta_dbgfs_scale_table_file;
163 struct dentry *rs_sta_dbgfs_stats_table_file;
164 struct dentry *rs_sta_dbgfs_rate_scale_data_file;
165 struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
166 u32 dbg_fixed_rate;
167 #endif
168 struct iwl_priv *drv;
169
170 /* used to be in sta_info */
171 int last_txrate_idx;
172 /* last tx rate_n_flags */
173 u32 last_rate_n_flags;
174 /* packets destined for this STA are aggregated */
175 u8 is_agg;
176 };
177
178 static void rs_rate_scale_perform(struct iwl_priv *priv,
179 struct sk_buff *skb,
180 struct ieee80211_sta *sta,
181 struct iwl_lq_sta *lq_sta);
182 static void rs_fill_link_cmd(struct iwl_priv *priv,
183 struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
184
185
186 #ifdef CONFIG_MAC80211_DEBUGFS
187 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
188 u32 *rate_n_flags, int index);
189 #else
190 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
191 u32 *rate_n_flags, int index)
192 {}
193 #endif
194
195 /**
196 * The following tables contain the expected throughput metrics for all rates
197 *
198 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
199 *
200 * where invalid entries are zeros.
201 *
202 * CCK rates are only valid in legacy table and will only be used in G
203 * (2.4 GHz) band.
204 */
205
206 static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
207 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
208 };
209
210 static s32 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
211 {0, 0, 0, 0, 42, 0, 76, 102, 124, 158, 183, 193, 202}, /* Norm */
212 {0, 0, 0, 0, 46, 0, 82, 110, 132, 167, 192, 202, 210}, /* SGI */
213 {0, 0, 0, 0, 48, 0, 93, 135, 176, 251, 319, 351, 381}, /* AGG */
214 {0, 0, 0, 0, 53, 0, 102, 149, 193, 275, 348, 381, 413}, /* AGG+SGI */
215 };
216
217 static s32 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
218 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
219 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
220 {0, 0, 0, 0, 96, 0, 182, 259, 328, 451, 553, 598, 640}, /* AGG */
221 {0, 0, 0, 0, 106, 0, 199, 282, 357, 487, 593, 640, 683}, /* AGG+SGI */
222 };
223
224 static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
225 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250}, /* Norm */
226 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256}, /* SGI */
227 {0, 0, 0, 0, 92, 0, 175, 250, 317, 436, 534, 578, 619}, /* AGG */
228 {0, 0, 0, 0, 102, 0, 192, 273, 344, 470, 573, 619, 660}, /* AGG+SGI*/
229 };
230
231 static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
232 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
233 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
234 {0, 0, 0, 0, 180, 0, 327, 446, 545, 708, 828, 878, 922}, /* AGG */
235 {0, 0, 0, 0, 197, 0, 355, 481, 584, 752, 872, 922, 966}, /* AGG+SGI */
236 };
237
238 static s32 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = {
239 {0, 0, 0, 0, 99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */
240 {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */
241 {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */
242 {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */
243 };
244
245 static s32 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = {
246 {0, 0, 0, 0, 152, 0, 211, 239, 255, 279, 290, 294, 297}, /* Norm */
247 {0, 0, 0, 0, 160, 0, 219, 245, 261, 284, 294, 297, 300}, /* SGI */
248 {0, 0, 0, 0, 254, 0, 443, 584, 695, 868, 984, 1030, 1070}, /* AGG */
249 {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */
250 };
251
252 /* mbps, mcs */
253 const static struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
254 { "1", "BPSK DSSS"},
255 { "2", "QPSK DSSS"},
256 {"5.5", "BPSK CCK"},
257 { "11", "QPSK CCK"},
258 { "6", "BPSK 1/2"},
259 { "9", "BPSK 1/2"},
260 { "12", "QPSK 1/2"},
261 { "18", "QPSK 3/4"},
262 { "24", "16QAM 1/2"},
263 { "36", "16QAM 3/4"},
264 { "48", "64QAM 2/3"},
265 { "54", "64QAM 3/4"},
266 { "60", "64QAM 5/6"},
267 };
268
269 #define MCS_INDEX_PER_STREAM (8)
270
271 static inline u8 rs_extract_rate(u32 rate_n_flags)
272 {
273 return (u8)(rate_n_flags & 0xFF);
274 }
275
276 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
277 {
278 window->data = 0;
279 window->success_counter = 0;
280 window->success_ratio = IWL_INVALID_VALUE;
281 window->counter = 0;
282 window->average_tpt = IWL_INVALID_VALUE;
283 window->stamp = 0;
284 }
285
286 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
287 {
288 return (ant_type & valid_antenna) == ant_type;
289 }
290
291 /*
292 * removes the old data from the statistics. All data that is older than
293 * TID_MAX_TIME_DIFF, will be deleted.
294 */
295 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
296 {
297 /* The oldest age we want to keep */
298 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
299
300 while (tl->queue_count &&
301 (tl->time_stamp < oldest_time)) {
302 tl->total -= tl->packet_count[tl->head];
303 tl->packet_count[tl->head] = 0;
304 tl->time_stamp += TID_QUEUE_CELL_SPACING;
305 tl->queue_count--;
306 tl->head++;
307 if (tl->head >= TID_QUEUE_MAX_SIZE)
308 tl->head = 0;
309 }
310 }
311
312 /*
313 * increment traffic load value for tid and also remove
314 * any old values if passed the certain time period
315 */
316 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
317 struct ieee80211_hdr *hdr)
318 {
319 u32 curr_time = jiffies_to_msecs(jiffies);
320 u32 time_diff;
321 s32 index;
322 struct iwl_traffic_load *tl = NULL;
323 u8 tid;
324
325 if (ieee80211_is_data_qos(hdr->frame_control)) {
326 u8 *qc = ieee80211_get_qos_ctl(hdr);
327 tid = qc[0] & 0xf;
328 } else
329 return MAX_TID_COUNT;
330
331 if (unlikely(tid >= TID_MAX_LOAD_COUNT))
332 return MAX_TID_COUNT;
333
334 tl = &lq_data->load[tid];
335
336 curr_time -= curr_time % TID_ROUND_VALUE;
337
338 /* Happens only for the first packet. Initialize the data */
339 if (!(tl->queue_count)) {
340 tl->total = 1;
341 tl->time_stamp = curr_time;
342 tl->queue_count = 1;
343 tl->head = 0;
344 tl->packet_count[0] = 1;
345 return MAX_TID_COUNT;
346 }
347
348 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
349 index = time_diff / TID_QUEUE_CELL_SPACING;
350
351 /* The history is too long: remove data that is older than */
352 /* TID_MAX_TIME_DIFF */
353 if (index >= TID_QUEUE_MAX_SIZE)
354 rs_tl_rm_old_stats(tl, curr_time);
355
356 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
357 tl->packet_count[index] = tl->packet_count[index] + 1;
358 tl->total = tl->total + 1;
359
360 if ((index + 1) > tl->queue_count)
361 tl->queue_count = index + 1;
362
363 return tid;
364 }
365
366 /*
367 get the traffic load value for tid
368 */
369 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
370 {
371 u32 curr_time = jiffies_to_msecs(jiffies);
372 u32 time_diff;
373 s32 index;
374 struct iwl_traffic_load *tl = NULL;
375
376 if (tid >= TID_MAX_LOAD_COUNT)
377 return 0;
378
379 tl = &(lq_data->load[tid]);
380
381 curr_time -= curr_time % TID_ROUND_VALUE;
382
383 if (!(tl->queue_count))
384 return 0;
385
386 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
387 index = time_diff / TID_QUEUE_CELL_SPACING;
388
389 /* The history is too long: remove data that is older than */
390 /* TID_MAX_TIME_DIFF */
391 if (index >= TID_QUEUE_MAX_SIZE)
392 rs_tl_rm_old_stats(tl, curr_time);
393
394 return tl->total;
395 }
396
397 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
398 struct iwl_lq_sta *lq_data, u8 tid,
399 struct ieee80211_sta *sta)
400 {
401 if (rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
402 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
403 sta->addr, tid);
404 ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
405 }
406 }
407
408 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
409 struct iwl_lq_sta *lq_data,
410 struct ieee80211_sta *sta)
411 {
412 if ((tid < TID_MAX_LOAD_COUNT))
413 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
414 else if (tid == IWL_AGG_ALL_TID)
415 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
416 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
417 if (priv->cfg->use_rts_for_ht) {
418 /*
419 * switch to RTS/CTS if it is the prefer protection method
420 * for HT traffic
421 */
422 IWL_DEBUG_HT(priv, "use RTS/CTS protection for HT\n");
423 priv->staging_rxon.flags &= ~RXON_FLG_SELF_CTS_EN;
424 iwlcore_commit_rxon(priv);
425 }
426 }
427
428 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
429 {
430 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
431 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
432 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
433 }
434
435 /**
436 * rs_collect_tx_data - Update the success/failure sliding window
437 *
438 * We keep a sliding window of the last 62 packets transmitted
439 * at this rate. window->data contains the bitmask of successful
440 * packets.
441 */
442 static int rs_collect_tx_data(struct iwl_rate_scale_data *windows,
443 int scale_index, s32 tpt, int attempts,
444 int successes)
445 {
446 struct iwl_rate_scale_data *window = NULL;
447 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
448 s32 fail_count;
449
450 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
451 return -EINVAL;
452
453 /* Select window for current tx bit rate */
454 window = &(windows[scale_index]);
455
456 /*
457 * Keep track of only the latest 62 tx frame attempts in this rate's
458 * history window; anything older isn't really relevant any more.
459 * If we have filled up the sliding window, drop the oldest attempt;
460 * if the oldest attempt (highest bit in bitmap) shows "success",
461 * subtract "1" from the success counter (this is the main reason
462 * we keep these bitmaps!).
463 */
464 while (attempts > 0) {
465 if (window->counter >= IWL_RATE_MAX_WINDOW) {
466
467 /* remove earliest */
468 window->counter = IWL_RATE_MAX_WINDOW - 1;
469
470 if (window->data & mask) {
471 window->data &= ~mask;
472 window->success_counter--;
473 }
474 }
475
476 /* Increment frames-attempted counter */
477 window->counter++;
478
479 /* Shift bitmap by one frame to throw away oldest history */
480 window->data <<= 1;
481
482 /* Mark the most recent #successes attempts as successful */
483 if (successes > 0) {
484 window->success_counter++;
485 window->data |= 0x1;
486 successes--;
487 }
488
489 attempts--;
490 }
491
492 /* Calculate current success ratio, avoid divide-by-0! */
493 if (window->counter > 0)
494 window->success_ratio = 128 * (100 * window->success_counter)
495 / window->counter;
496 else
497 window->success_ratio = IWL_INVALID_VALUE;
498
499 fail_count = window->counter - window->success_counter;
500
501 /* Calculate average throughput, if we have enough history. */
502 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
503 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
504 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
505 else
506 window->average_tpt = IWL_INVALID_VALUE;
507
508 /* Tag this window as having been updated */
509 window->stamp = jiffies;
510
511 return 0;
512 }
513
514 /*
515 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
516 */
517 /* FIXME:RS:remove this function and put the flags statically in the table */
518 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
519 struct iwl_scale_tbl_info *tbl,
520 int index, u8 use_green)
521 {
522 u32 rate_n_flags = 0;
523
524 if (is_legacy(tbl->lq_type)) {
525 rate_n_flags = iwl_rates[index].plcp;
526 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
527 rate_n_flags |= RATE_MCS_CCK_MSK;
528
529 } else if (is_Ht(tbl->lq_type)) {
530 if (index > IWL_LAST_OFDM_RATE) {
531 IWL_ERR(priv, "Invalid HT rate index %d\n", index);
532 index = IWL_LAST_OFDM_RATE;
533 }
534 rate_n_flags = RATE_MCS_HT_MSK;
535
536 if (is_siso(tbl->lq_type))
537 rate_n_flags |= iwl_rates[index].plcp_siso;
538 else if (is_mimo2(tbl->lq_type))
539 rate_n_flags |= iwl_rates[index].plcp_mimo2;
540 else
541 rate_n_flags |= iwl_rates[index].plcp_mimo3;
542 } else {
543 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
544 }
545
546 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
547 RATE_MCS_ANT_ABC_MSK);
548
549 if (is_Ht(tbl->lq_type)) {
550 if (tbl->is_ht40) {
551 if (tbl->is_dup)
552 rate_n_flags |= RATE_MCS_DUP_MSK;
553 else
554 rate_n_flags |= RATE_MCS_HT40_MSK;
555 }
556 if (tbl->is_SGI)
557 rate_n_flags |= RATE_MCS_SGI_MSK;
558
559 if (use_green) {
560 rate_n_flags |= RATE_MCS_GF_MSK;
561 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
562 rate_n_flags &= ~RATE_MCS_SGI_MSK;
563 IWL_ERR(priv, "GF was set with SGI:SISO\n");
564 }
565 }
566 }
567 return rate_n_flags;
568 }
569
570 /*
571 * Interpret uCode API's rate_n_flags format,
572 * fill "search" or "active" tx mode table.
573 */
574 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
575 enum ieee80211_band band,
576 struct iwl_scale_tbl_info *tbl,
577 int *rate_idx)
578 {
579 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
580 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
581 u8 mcs;
582
583 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
584
585 if (*rate_idx == IWL_RATE_INVALID) {
586 *rate_idx = -1;
587 return -EINVAL;
588 }
589 tbl->is_SGI = 0; /* default legacy setup */
590 tbl->is_ht40 = 0;
591 tbl->is_dup = 0;
592 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
593 tbl->lq_type = LQ_NONE;
594 tbl->max_search = IWL_MAX_SEARCH;
595
596 /* legacy rate format */
597 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
598 if (num_of_ant == 1) {
599 if (band == IEEE80211_BAND_5GHZ)
600 tbl->lq_type = LQ_A;
601 else
602 tbl->lq_type = LQ_G;
603 }
604 /* HT rate format */
605 } else {
606 if (rate_n_flags & RATE_MCS_SGI_MSK)
607 tbl->is_SGI = 1;
608
609 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
610 (rate_n_flags & RATE_MCS_DUP_MSK))
611 tbl->is_ht40 = 1;
612
613 if (rate_n_flags & RATE_MCS_DUP_MSK)
614 tbl->is_dup = 1;
615
616 mcs = rs_extract_rate(rate_n_flags);
617
618 /* SISO */
619 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
620 if (num_of_ant == 1)
621 tbl->lq_type = LQ_SISO; /*else NONE*/
622 /* MIMO2 */
623 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
624 if (num_of_ant == 2)
625 tbl->lq_type = LQ_MIMO2;
626 /* MIMO3 */
627 } else {
628 if (num_of_ant == 3) {
629 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
630 tbl->lq_type = LQ_MIMO3;
631 }
632 }
633 }
634 return 0;
635 }
636
637 /* switch to another antenna/antennas and return 1 */
638 /* if no other valid antenna found, return 0 */
639 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
640 struct iwl_scale_tbl_info *tbl)
641 {
642 u8 new_ant_type;
643
644 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
645 return 0;
646
647 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
648 return 0;
649
650 new_ant_type = ant_toggle_lookup[tbl->ant_type];
651
652 while ((new_ant_type != tbl->ant_type) &&
653 !rs_is_valid_ant(valid_ant, new_ant_type))
654 new_ant_type = ant_toggle_lookup[new_ant_type];
655
656 if (new_ant_type == tbl->ant_type)
657 return 0;
658
659 tbl->ant_type = new_ant_type;
660 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
661 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
662 return 1;
663 }
664
665 /**
666 * Green-field mode is valid if the station supports it and
667 * there are no non-GF stations present in the BSS.
668 */
669 static inline u8 rs_use_green(struct ieee80211_sta *sta,
670 struct iwl_ht_config *ht_conf)
671 {
672 return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
673 !(ht_conf->non_GF_STA_present);
674 }
675
676 /**
677 * rs_get_supported_rates - get the available rates
678 *
679 * if management frame or broadcast frame only return
680 * basic available rates.
681 *
682 */
683 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
684 struct ieee80211_hdr *hdr,
685 enum iwl_table_type rate_type)
686 {
687 if (hdr && is_multicast_ether_addr(hdr->addr1) &&
688 lq_sta->active_rate_basic)
689 return lq_sta->active_rate_basic;
690
691 if (is_legacy(rate_type)) {
692 return lq_sta->active_legacy_rate;
693 } else {
694 if (is_siso(rate_type))
695 return lq_sta->active_siso_rate;
696 else if (is_mimo2(rate_type))
697 return lq_sta->active_mimo2_rate;
698 else
699 return lq_sta->active_mimo3_rate;
700 }
701 }
702
703 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
704 int rate_type)
705 {
706 u8 high = IWL_RATE_INVALID;
707 u8 low = IWL_RATE_INVALID;
708
709 /* 802.11A or ht walks to the next literal adjacent rate in
710 * the rate table */
711 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
712 int i;
713 u32 mask;
714
715 /* Find the previous rate that is in the rate mask */
716 i = index - 1;
717 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
718 if (rate_mask & mask) {
719 low = i;
720 break;
721 }
722 }
723
724 /* Find the next rate that is in the rate mask */
725 i = index + 1;
726 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
727 if (rate_mask & mask) {
728 high = i;
729 break;
730 }
731 }
732
733 return (high << 8) | low;
734 }
735
736 low = index;
737 while (low != IWL_RATE_INVALID) {
738 low = iwl_rates[low].prev_rs;
739 if (low == IWL_RATE_INVALID)
740 break;
741 if (rate_mask & (1 << low))
742 break;
743 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
744 }
745
746 high = index;
747 while (high != IWL_RATE_INVALID) {
748 high = iwl_rates[high].next_rs;
749 if (high == IWL_RATE_INVALID)
750 break;
751 if (rate_mask & (1 << high))
752 break;
753 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
754 }
755
756 return (high << 8) | low;
757 }
758
759 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
760 struct iwl_scale_tbl_info *tbl,
761 u8 scale_index, u8 ht_possible)
762 {
763 s32 low;
764 u16 rate_mask;
765 u16 high_low;
766 u8 switch_to_legacy = 0;
767 u8 is_green = lq_sta->is_green;
768 struct iwl_priv *priv = lq_sta->drv;
769
770 /* check if we need to switch from HT to legacy rates.
771 * assumption is that mandatory rates (1Mbps or 6Mbps)
772 * are always supported (spec demand) */
773 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
774 switch_to_legacy = 1;
775 scale_index = rs_ht_to_legacy[scale_index];
776 if (lq_sta->band == IEEE80211_BAND_5GHZ)
777 tbl->lq_type = LQ_A;
778 else
779 tbl->lq_type = LQ_G;
780
781 if (num_of_ant(tbl->ant_type) > 1)
782 tbl->ant_type =
783 first_antenna(priv->hw_params.valid_tx_ant);
784
785 tbl->is_ht40 = 0;
786 tbl->is_SGI = 0;
787 tbl->max_search = IWL_MAX_SEARCH;
788 }
789
790 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
791
792 /* Mask with station rate restriction */
793 if (is_legacy(tbl->lq_type)) {
794 /* supp_rates has no CCK bits in A mode */
795 if (lq_sta->band == IEEE80211_BAND_5GHZ)
796 rate_mask = (u16)(rate_mask &
797 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
798 else
799 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
800 }
801
802 /* If we switched from HT to legacy, check current rate */
803 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
804 low = scale_index;
805 goto out;
806 }
807
808 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
809 tbl->lq_type);
810 low = high_low & 0xff;
811
812 if (low == IWL_RATE_INVALID)
813 low = scale_index;
814
815 out:
816 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
817 }
818
819 /*
820 * Simple function to compare two rate scale table types
821 */
822 static bool table_type_matches(struct iwl_scale_tbl_info *a,
823 struct iwl_scale_tbl_info *b)
824 {
825 return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
826 (a->is_SGI == b->is_SGI);
827 }
828 /*
829 * Static function to get the expected throughput from an iwl_scale_tbl_info
830 * that wraps a NULL pointer check
831 */
832 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
833 {
834 if (tbl->expected_tpt)
835 return tbl->expected_tpt[rs_index];
836 return 0;
837 }
838
839 /*
840 * mac80211 sends us Tx status
841 */
842 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
843 struct ieee80211_sta *sta, void *priv_sta,
844 struct sk_buff *skb)
845 {
846 int legacy_success;
847 int retries;
848 int rs_index, mac_index, i;
849 struct iwl_lq_sta *lq_sta = priv_sta;
850 struct iwl_link_quality_cmd *table;
851 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
852 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
853 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
854 struct iwl_rate_scale_data *window = NULL;
855 enum mac80211_rate_control_flags mac_flags;
856 u32 tx_rate;
857 struct iwl_scale_tbl_info tbl_type;
858 struct iwl_scale_tbl_info *curr_tbl, *other_tbl;
859 s32 tpt = 0;
860
861 IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
862
863 if (!ieee80211_is_data(hdr->frame_control) ||
864 info->flags & IEEE80211_TX_CTL_NO_ACK)
865 return;
866
867 /* This packet was aggregated but doesn't carry status info */
868 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
869 !(info->flags & IEEE80211_TX_STAT_AMPDU))
870 return;
871
872 if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
873 !lq_sta->ibss_sta_added)
874 return;
875
876 /*
877 * Ignore this Tx frame response if its initial rate doesn't match
878 * that of latest Link Quality command. There may be stragglers
879 * from a previous Link Quality command, but we're no longer interested
880 * in those; they're either from the "active" mode while we're trying
881 * to check "search" mode, or a prior "search" mode after we've moved
882 * to a new "search" mode (which might become the new "active" mode).
883 */
884 table = &lq_sta->lq;
885 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
886 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
887 if (priv->band == IEEE80211_BAND_5GHZ)
888 rs_index -= IWL_FIRST_OFDM_RATE;
889 mac_flags = info->status.rates[0].flags;
890 mac_index = info->status.rates[0].idx;
891 /* For HT packets, map MCS to PLCP */
892 if (mac_flags & IEEE80211_TX_RC_MCS) {
893 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
894 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
895 mac_index++;
896 /*
897 * mac80211 HT index is always zero-indexed; we need to move
898 * HT OFDM rates after CCK rates in 2.4 GHz band
899 */
900 if (priv->band == IEEE80211_BAND_2GHZ)
901 mac_index += IWL_FIRST_OFDM_RATE;
902 }
903 /* Here we actually compare this rate to the latest LQ command */
904 if ((mac_index < 0) ||
905 (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
906 (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
907 (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
908 (tbl_type.ant_type != info->antenna_sel_tx) ||
909 (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
910 (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
911 (rs_index != mac_index)) {
912 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate);
913 /*
914 * Since rates mis-match, the last LQ command may have failed.
915 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
916 * ... driver.
917 */
918 lq_sta->missed_rate_counter++;
919 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
920 lq_sta->missed_rate_counter = 0;
921 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
922 }
923 /* Regardless, ignore this status info for outdated rate */
924 return;
925 } else
926 /* Rate did match, so reset the missed_rate_counter */
927 lq_sta->missed_rate_counter = 0;
928
929 /* Figure out if rate scale algorithm is in active or search table */
930 if (table_type_matches(&tbl_type,
931 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
932 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
933 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
934 } else if (table_type_matches(&tbl_type,
935 &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
936 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
937 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
938 } else {
939 IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n");
940 return;
941 }
942 window = (struct iwl_rate_scale_data *)&(curr_tbl->win[0]);
943
944 /*
945 * Updating the frame history depends on whether packets were
946 * aggregated.
947 *
948 * For aggregation, all packets were transmitted at the same rate, the
949 * first index into rate scale table.
950 */
951 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
952 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
953 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
954 &rs_index);
955 tpt = get_expected_tpt(curr_tbl, rs_index);
956 rs_collect_tx_data(window, rs_index, tpt,
957 info->status.ampdu_ack_len,
958 info->status.ampdu_ack_map);
959
960 /* Update success/fail counts if not searching for new mode */
961 if (lq_sta->stay_in_tbl) {
962 lq_sta->total_success += info->status.ampdu_ack_map;
963 lq_sta->total_failed += (info->status.ampdu_ack_len -
964 info->status.ampdu_ack_map);
965 }
966 } else {
967 /*
968 * For legacy, update frame history with for each Tx retry.
969 */
970 retries = info->status.rates[0].count - 1;
971 /* HW doesn't send more than 15 retries */
972 retries = min(retries, 15);
973
974 /* The last transmission may have been successful */
975 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
976 /* Collect data for each rate used during failed TX attempts */
977 for (i = 0; i <= retries; ++i) {
978 tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
979 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
980 &tbl_type, &rs_index);
981 /*
982 * Only collect stats if retried rate is in the same RS
983 * table as active/search.
984 */
985 if (table_type_matches(&tbl_type, curr_tbl))
986 tpt = get_expected_tpt(curr_tbl, rs_index);
987 else if (table_type_matches(&tbl_type, other_tbl))
988 tpt = get_expected_tpt(other_tbl, rs_index);
989 else
990 continue;
991
992 /* Constants mean 1 transmission, 0 successes */
993 if (i < retries)
994 rs_collect_tx_data(window, rs_index, tpt, 1,
995 0);
996 else
997 rs_collect_tx_data(window, rs_index, tpt, 1,
998 legacy_success);
999 }
1000
1001 /* Update success/fail counts if not searching for new mode */
1002 if (lq_sta->stay_in_tbl) {
1003 lq_sta->total_success += legacy_success;
1004 lq_sta->total_failed += retries + (1 - legacy_success);
1005 }
1006 }
1007 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1008 lq_sta->last_rate_n_flags = tx_rate;
1009
1010 /* See if there's a better rate or modulation mode to try. */
1011 if (sta && sta->supp_rates[sband->band])
1012 rs_rate_scale_perform(priv, skb, sta, lq_sta);
1013 }
1014
1015 /*
1016 * Begin a period of staying with a selected modulation mode.
1017 * Set "stay_in_tbl" flag to prevent any mode switches.
1018 * Set frame tx success limits according to legacy vs. high-throughput,
1019 * and reset overall (spanning all rates) tx success history statistics.
1020 * These control how long we stay using same modulation mode before
1021 * searching for a new mode.
1022 */
1023 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
1024 struct iwl_lq_sta *lq_sta)
1025 {
1026 IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
1027 lq_sta->stay_in_tbl = 1; /* only place this gets set */
1028 if (is_legacy) {
1029 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1030 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1031 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1032 } else {
1033 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1034 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1035 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1036 }
1037 lq_sta->table_count = 0;
1038 lq_sta->total_failed = 0;
1039 lq_sta->total_success = 0;
1040 lq_sta->flush_timer = jiffies;
1041 lq_sta->action_counter = 0;
1042 }
1043
1044 /*
1045 * Find correct throughput table for given mode of modulation
1046 */
1047 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1048 struct iwl_scale_tbl_info *tbl)
1049 {
1050 /* Used to choose among HT tables */
1051 s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1052
1053 /* Check for invalid LQ type */
1054 if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1055 tbl->expected_tpt = expected_tpt_legacy;
1056 return;
1057 }
1058
1059 /* Legacy rates have only one table */
1060 if (is_legacy(tbl->lq_type)) {
1061 tbl->expected_tpt = expected_tpt_legacy;
1062 return;
1063 }
1064
1065 /* Choose among many HT tables depending on number of streams
1066 * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
1067 * status */
1068 if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1069 ht_tbl_pointer = expected_tpt_siso20MHz;
1070 else if (is_siso(tbl->lq_type))
1071 ht_tbl_pointer = expected_tpt_siso40MHz;
1072 else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1073 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1074 else if (is_mimo2(tbl->lq_type))
1075 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1076 else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1077 ht_tbl_pointer = expected_tpt_mimo3_20MHz;
1078 else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
1079 ht_tbl_pointer = expected_tpt_mimo3_40MHz;
1080
1081 if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */
1082 tbl->expected_tpt = ht_tbl_pointer[0];
1083 else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */
1084 tbl->expected_tpt = ht_tbl_pointer[1];
1085 else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */
1086 tbl->expected_tpt = ht_tbl_pointer[2];
1087 else /* AGG+SGI */
1088 tbl->expected_tpt = ht_tbl_pointer[3];
1089 }
1090
1091 /*
1092 * Find starting rate for new "search" high-throughput mode of modulation.
1093 * Goal is to find lowest expected rate (under perfect conditions) that is
1094 * above the current measured throughput of "active" mode, to give new mode
1095 * a fair chance to prove itself without too many challenges.
1096 *
1097 * This gets called when transitioning to more aggressive modulation
1098 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1099 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1100 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1101 * bit rate will typically need to increase, but not if performance was bad.
1102 */
1103 static s32 rs_get_best_rate(struct iwl_priv *priv,
1104 struct iwl_lq_sta *lq_sta,
1105 struct iwl_scale_tbl_info *tbl, /* "search" */
1106 u16 rate_mask, s8 index)
1107 {
1108 /* "active" values */
1109 struct iwl_scale_tbl_info *active_tbl =
1110 &(lq_sta->lq_info[lq_sta->active_tbl]);
1111 s32 active_sr = active_tbl->win[index].success_ratio;
1112 s32 active_tpt = active_tbl->expected_tpt[index];
1113
1114 /* expected "search" throughput */
1115 s32 *tpt_tbl = tbl->expected_tpt;
1116
1117 s32 new_rate, high, low, start_hi;
1118 u16 high_low;
1119 s8 rate = index;
1120
1121 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1122
1123 for (; ;) {
1124 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1125 tbl->lq_type);
1126
1127 low = high_low & 0xff;
1128 high = (high_low >> 8) & 0xff;
1129
1130 /*
1131 * Lower the "search" bit rate, to give new "search" mode
1132 * approximately the same throughput as "active" if:
1133 *
1134 * 1) "Active" mode has been working modestly well (but not
1135 * great), and expected "search" throughput (under perfect
1136 * conditions) at candidate rate is above the actual
1137 * measured "active" throughput (but less than expected
1138 * "active" throughput under perfect conditions).
1139 * OR
1140 * 2) "Active" mode has been working perfectly or very well
1141 * and expected "search" throughput (under perfect
1142 * conditions) at candidate rate is above expected
1143 * "active" throughput (under perfect conditions).
1144 */
1145 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1146 ((active_sr > IWL_RATE_DECREASE_TH) &&
1147 (active_sr <= IWL_RATE_HIGH_TH) &&
1148 (tpt_tbl[rate] <= active_tpt))) ||
1149 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1150 (tpt_tbl[rate] > active_tpt))) {
1151
1152 /* (2nd or later pass)
1153 * If we've already tried to raise the rate, and are
1154 * now trying to lower it, use the higher rate. */
1155 if (start_hi != IWL_RATE_INVALID) {
1156 new_rate = start_hi;
1157 break;
1158 }
1159
1160 new_rate = rate;
1161
1162 /* Loop again with lower rate */
1163 if (low != IWL_RATE_INVALID)
1164 rate = low;
1165
1166 /* Lower rate not available, use the original */
1167 else
1168 break;
1169
1170 /* Else try to raise the "search" rate to match "active" */
1171 } else {
1172 /* (2nd or later pass)
1173 * If we've already tried to lower the rate, and are
1174 * now trying to raise it, use the lower rate. */
1175 if (new_rate != IWL_RATE_INVALID)
1176 break;
1177
1178 /* Loop again with higher rate */
1179 else if (high != IWL_RATE_INVALID) {
1180 start_hi = high;
1181 rate = high;
1182
1183 /* Higher rate not available, use the original */
1184 } else {
1185 new_rate = rate;
1186 break;
1187 }
1188 }
1189 }
1190
1191 return new_rate;
1192 }
1193
1194 /*
1195 * Set up search table for MIMO2
1196 */
1197 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1198 struct iwl_lq_sta *lq_sta,
1199 struct ieee80211_conf *conf,
1200 struct ieee80211_sta *sta,
1201 struct iwl_scale_tbl_info *tbl, int index)
1202 {
1203 u16 rate_mask;
1204 s32 rate;
1205 s8 is_green = lq_sta->is_green;
1206
1207 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1208 return -1;
1209
1210 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1211 == WLAN_HT_CAP_SM_PS_STATIC)
1212 return -1;
1213
1214 /* Need both Tx chains/antennas to support MIMO */
1215 if (priv->hw_params.tx_chains_num < 2)
1216 return -1;
1217
1218 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1219
1220 tbl->lq_type = LQ_MIMO2;
1221 tbl->is_dup = lq_sta->is_dup;
1222 tbl->action = 0;
1223 tbl->max_search = IWL_MAX_SEARCH;
1224 rate_mask = lq_sta->active_mimo2_rate;
1225
1226 if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1227 tbl->is_ht40 = 1;
1228 else
1229 tbl->is_ht40 = 0;
1230
1231 rs_set_expected_tpt_table(lq_sta, tbl);
1232
1233 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1234
1235 IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1236 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1237 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1238 rate, rate_mask);
1239 return -1;
1240 }
1241 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1242
1243 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1244 tbl->current_rate, is_green);
1245 return 0;
1246 }
1247
1248 /*
1249 * Set up search table for MIMO3
1250 */
1251 static int rs_switch_to_mimo3(struct iwl_priv *priv,
1252 struct iwl_lq_sta *lq_sta,
1253 struct ieee80211_conf *conf,
1254 struct ieee80211_sta *sta,
1255 struct iwl_scale_tbl_info *tbl, int index)
1256 {
1257 u16 rate_mask;
1258 s32 rate;
1259 s8 is_green = lq_sta->is_green;
1260
1261 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1262 return -1;
1263
1264 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1265 == WLAN_HT_CAP_SM_PS_STATIC)
1266 return -1;
1267
1268 /* Need both Tx chains/antennas to support MIMO */
1269 if (priv->hw_params.tx_chains_num < 3)
1270 return -1;
1271
1272 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1273
1274 tbl->lq_type = LQ_MIMO3;
1275 tbl->is_dup = lq_sta->is_dup;
1276 tbl->action = 0;
1277 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1278 rate_mask = lq_sta->active_mimo3_rate;
1279
1280 if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1281 tbl->is_ht40 = 1;
1282 else
1283 tbl->is_ht40 = 0;
1284
1285 rs_set_expected_tpt_table(lq_sta, tbl);
1286
1287 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1288
1289 IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1290 rate, rate_mask);
1291 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1292 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1293 rate, rate_mask);
1294 return -1;
1295 }
1296 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1297
1298 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1299 tbl->current_rate, is_green);
1300 return 0;
1301 }
1302
1303 /*
1304 * Set up search table for SISO
1305 */
1306 static int rs_switch_to_siso(struct iwl_priv *priv,
1307 struct iwl_lq_sta *lq_sta,
1308 struct ieee80211_conf *conf,
1309 struct ieee80211_sta *sta,
1310 struct iwl_scale_tbl_info *tbl, int index)
1311 {
1312 u16 rate_mask;
1313 u8 is_green = lq_sta->is_green;
1314 s32 rate;
1315
1316 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1317 return -1;
1318
1319 IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1320
1321 tbl->is_dup = lq_sta->is_dup;
1322 tbl->lq_type = LQ_SISO;
1323 tbl->action = 0;
1324 tbl->max_search = IWL_MAX_SEARCH;
1325 rate_mask = lq_sta->active_siso_rate;
1326
1327 if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1328 tbl->is_ht40 = 1;
1329 else
1330 tbl->is_ht40 = 0;
1331
1332 if (is_green)
1333 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1334
1335 rs_set_expected_tpt_table(lq_sta, tbl);
1336 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1337
1338 IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1339 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1340 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1341 rate, rate_mask);
1342 return -1;
1343 }
1344 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1345 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1346 tbl->current_rate, is_green);
1347 return 0;
1348 }
1349
1350 /*
1351 * Try to switch to new modulation mode from legacy
1352 */
1353 static int rs_move_legacy_other(struct iwl_priv *priv,
1354 struct iwl_lq_sta *lq_sta,
1355 struct ieee80211_conf *conf,
1356 struct ieee80211_sta *sta,
1357 int index)
1358 {
1359 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1360 struct iwl_scale_tbl_info *search_tbl =
1361 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1362 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1363 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1364 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1365 u8 start_action = tbl->action;
1366 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1367 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1368 int ret = 0;
1369 u8 update_search_tbl_counter = 0;
1370
1371 if (!iwl_ht_enabled(priv))
1372 /* stay in Legacy */
1373 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1374 else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1375 tbl->action > IWL_LEGACY_SWITCH_SISO)
1376 tbl->action = IWL_LEGACY_SWITCH_SISO;
1377 for (; ;) {
1378 lq_sta->action_counter++;
1379 switch (tbl->action) {
1380 case IWL_LEGACY_SWITCH_ANTENNA1:
1381 case IWL_LEGACY_SWITCH_ANTENNA2:
1382 IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1383
1384 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1385 tx_chains_num <= 1) ||
1386 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1387 tx_chains_num <= 2))
1388 break;
1389
1390 /* Don't change antenna if success has been great */
1391 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1392 break;
1393
1394 /* Set up search table to try other antenna */
1395 memcpy(search_tbl, tbl, sz);
1396
1397 if (rs_toggle_antenna(valid_tx_ant,
1398 &search_tbl->current_rate, search_tbl)) {
1399 update_search_tbl_counter = 1;
1400 rs_set_expected_tpt_table(lq_sta, search_tbl);
1401 goto out;
1402 }
1403 break;
1404 case IWL_LEGACY_SWITCH_SISO:
1405 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1406
1407 /* Set up search table to try SISO */
1408 memcpy(search_tbl, tbl, sz);
1409 search_tbl->is_SGI = 0;
1410 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1411 search_tbl, index);
1412 if (!ret) {
1413 lq_sta->action_counter = 0;
1414 goto out;
1415 }
1416
1417 break;
1418 case IWL_LEGACY_SWITCH_MIMO2_AB:
1419 case IWL_LEGACY_SWITCH_MIMO2_AC:
1420 case IWL_LEGACY_SWITCH_MIMO2_BC:
1421 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1422
1423 /* Set up search table to try MIMO */
1424 memcpy(search_tbl, tbl, sz);
1425 search_tbl->is_SGI = 0;
1426
1427 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1428 search_tbl->ant_type = ANT_AB;
1429 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1430 search_tbl->ant_type = ANT_AC;
1431 else
1432 search_tbl->ant_type = ANT_BC;
1433
1434 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1435 break;
1436
1437 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1438 search_tbl, index);
1439 if (!ret) {
1440 lq_sta->action_counter = 0;
1441 goto out;
1442 }
1443 break;
1444
1445 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1446 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1447
1448 /* Set up search table to try MIMO3 */
1449 memcpy(search_tbl, tbl, sz);
1450 search_tbl->is_SGI = 0;
1451
1452 search_tbl->ant_type = ANT_ABC;
1453
1454 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1455 break;
1456
1457 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1458 search_tbl, index);
1459 if (!ret) {
1460 lq_sta->action_counter = 0;
1461 goto out;
1462 }
1463 break;
1464 }
1465 tbl->action++;
1466 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1467 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1468
1469 if (tbl->action == start_action)
1470 break;
1471
1472 }
1473 search_tbl->lq_type = LQ_NONE;
1474 return 0;
1475
1476 out:
1477 lq_sta->search_better_tbl = 1;
1478 tbl->action++;
1479 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1480 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1481 if (update_search_tbl_counter)
1482 search_tbl->action = tbl->action;
1483 return 0;
1484
1485 }
1486
1487 /*
1488 * Try to switch to new modulation mode from SISO
1489 */
1490 static int rs_move_siso_to_other(struct iwl_priv *priv,
1491 struct iwl_lq_sta *lq_sta,
1492 struct ieee80211_conf *conf,
1493 struct ieee80211_sta *sta, int index)
1494 {
1495 u8 is_green = lq_sta->is_green;
1496 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1497 struct iwl_scale_tbl_info *search_tbl =
1498 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1499 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1500 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1501 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1502 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1503 u8 start_action = tbl->action;
1504 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1505 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1506 u8 update_search_tbl_counter = 0;
1507 int ret;
1508
1509 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1510 tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1511 /* stay in SISO */
1512 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1513 }
1514 for (;;) {
1515 lq_sta->action_counter++;
1516 switch (tbl->action) {
1517 case IWL_SISO_SWITCH_ANTENNA1:
1518 case IWL_SISO_SWITCH_ANTENNA2:
1519 IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1520
1521 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1522 tx_chains_num <= 1) ||
1523 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1524 tx_chains_num <= 2))
1525 break;
1526
1527 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1528 break;
1529
1530 memcpy(search_tbl, tbl, sz);
1531 if (rs_toggle_antenna(valid_tx_ant,
1532 &search_tbl->current_rate, search_tbl)) {
1533 update_search_tbl_counter = 1;
1534 goto out;
1535 }
1536 break;
1537 case IWL_SISO_SWITCH_MIMO2_AB:
1538 case IWL_SISO_SWITCH_MIMO2_AC:
1539 case IWL_SISO_SWITCH_MIMO2_BC:
1540 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1541 memcpy(search_tbl, tbl, sz);
1542 search_tbl->is_SGI = 0;
1543
1544 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1545 search_tbl->ant_type = ANT_AB;
1546 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1547 search_tbl->ant_type = ANT_AC;
1548 else
1549 search_tbl->ant_type = ANT_BC;
1550
1551 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1552 break;
1553
1554 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1555 search_tbl, index);
1556 if (!ret)
1557 goto out;
1558 break;
1559 case IWL_SISO_SWITCH_GI:
1560 if (!tbl->is_ht40 && !(ht_cap->cap &
1561 IEEE80211_HT_CAP_SGI_20))
1562 break;
1563 if (tbl->is_ht40 && !(ht_cap->cap &
1564 IEEE80211_HT_CAP_SGI_40))
1565 break;
1566
1567 IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1568
1569 memcpy(search_tbl, tbl, sz);
1570 if (is_green) {
1571 if (!tbl->is_SGI)
1572 break;
1573 else
1574 IWL_ERR(priv,
1575 "SGI was set in GF+SISO\n");
1576 }
1577 search_tbl->is_SGI = !tbl->is_SGI;
1578 rs_set_expected_tpt_table(lq_sta, search_tbl);
1579 if (tbl->is_SGI) {
1580 s32 tpt = lq_sta->last_tpt / 100;
1581 if (tpt >= search_tbl->expected_tpt[index])
1582 break;
1583 }
1584 search_tbl->current_rate =
1585 rate_n_flags_from_tbl(priv, search_tbl,
1586 index, is_green);
1587 update_search_tbl_counter = 1;
1588 goto out;
1589 case IWL_SISO_SWITCH_MIMO3_ABC:
1590 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1591 memcpy(search_tbl, tbl, sz);
1592 search_tbl->is_SGI = 0;
1593 search_tbl->ant_type = ANT_ABC;
1594
1595 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1596 break;
1597
1598 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1599 search_tbl, index);
1600 if (!ret)
1601 goto out;
1602 break;
1603 }
1604 tbl->action++;
1605 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1606 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1607
1608 if (tbl->action == start_action)
1609 break;
1610 }
1611 search_tbl->lq_type = LQ_NONE;
1612 return 0;
1613
1614 out:
1615 lq_sta->search_better_tbl = 1;
1616 tbl->action++;
1617 if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1618 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1619 if (update_search_tbl_counter)
1620 search_tbl->action = tbl->action;
1621
1622 return 0;
1623 }
1624
1625 /*
1626 * Try to switch to new modulation mode from MIMO2
1627 */
1628 static int rs_move_mimo2_to_other(struct iwl_priv *priv,
1629 struct iwl_lq_sta *lq_sta,
1630 struct ieee80211_conf *conf,
1631 struct ieee80211_sta *sta, int index)
1632 {
1633 s8 is_green = lq_sta->is_green;
1634 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1635 struct iwl_scale_tbl_info *search_tbl =
1636 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1637 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1638 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1639 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1640 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1641 u8 start_action = tbl->action;
1642 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1643 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1644 u8 update_search_tbl_counter = 0;
1645 int ret;
1646
1647 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1648 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1649 tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1650 /* switch in SISO */
1651 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1652 }
1653 for (;;) {
1654 lq_sta->action_counter++;
1655 switch (tbl->action) {
1656 case IWL_MIMO2_SWITCH_ANTENNA1:
1657 case IWL_MIMO2_SWITCH_ANTENNA2:
1658 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1659
1660 if (tx_chains_num <= 2)
1661 break;
1662
1663 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1664 break;
1665
1666 memcpy(search_tbl, tbl, sz);
1667 if (rs_toggle_antenna(valid_tx_ant,
1668 &search_tbl->current_rate, search_tbl)) {
1669 update_search_tbl_counter = 1;
1670 goto out;
1671 }
1672 break;
1673 case IWL_MIMO2_SWITCH_SISO_A:
1674 case IWL_MIMO2_SWITCH_SISO_B:
1675 case IWL_MIMO2_SWITCH_SISO_C:
1676 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1677
1678 /* Set up new search table for SISO */
1679 memcpy(search_tbl, tbl, sz);
1680
1681 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1682 search_tbl->ant_type = ANT_A;
1683 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1684 search_tbl->ant_type = ANT_B;
1685 else
1686 search_tbl->ant_type = ANT_C;
1687
1688 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1689 break;
1690
1691 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1692 search_tbl, index);
1693 if (!ret)
1694 goto out;
1695
1696 break;
1697
1698 case IWL_MIMO2_SWITCH_GI:
1699 if (!tbl->is_ht40 && !(ht_cap->cap &
1700 IEEE80211_HT_CAP_SGI_20))
1701 break;
1702 if (tbl->is_ht40 && !(ht_cap->cap &
1703 IEEE80211_HT_CAP_SGI_40))
1704 break;
1705
1706 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1707
1708 /* Set up new search table for MIMO2 */
1709 memcpy(search_tbl, tbl, sz);
1710 search_tbl->is_SGI = !tbl->is_SGI;
1711 rs_set_expected_tpt_table(lq_sta, search_tbl);
1712 /*
1713 * If active table already uses the fastest possible
1714 * modulation (dual stream with short guard interval),
1715 * and it's working well, there's no need to look
1716 * for a better type of modulation!
1717 */
1718 if (tbl->is_SGI) {
1719 s32 tpt = lq_sta->last_tpt / 100;
1720 if (tpt >= search_tbl->expected_tpt[index])
1721 break;
1722 }
1723 search_tbl->current_rate =
1724 rate_n_flags_from_tbl(priv, search_tbl,
1725 index, is_green);
1726 update_search_tbl_counter = 1;
1727 goto out;
1728
1729 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1730 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1731 memcpy(search_tbl, tbl, sz);
1732 search_tbl->is_SGI = 0;
1733 search_tbl->ant_type = ANT_ABC;
1734
1735 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1736 break;
1737
1738 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1739 search_tbl, index);
1740 if (!ret)
1741 goto out;
1742
1743 break;
1744 }
1745 tbl->action++;
1746 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1747 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1748
1749 if (tbl->action == start_action)
1750 break;
1751 }
1752 search_tbl->lq_type = LQ_NONE;
1753 return 0;
1754 out:
1755 lq_sta->search_better_tbl = 1;
1756 tbl->action++;
1757 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1758 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1759 if (update_search_tbl_counter)
1760 search_tbl->action = tbl->action;
1761
1762 return 0;
1763
1764 }
1765
1766 /*
1767 * Try to switch to new modulation mode from MIMO3
1768 */
1769 static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1770 struct iwl_lq_sta *lq_sta,
1771 struct ieee80211_conf *conf,
1772 struct ieee80211_sta *sta, int index)
1773 {
1774 s8 is_green = lq_sta->is_green;
1775 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1776 struct iwl_scale_tbl_info *search_tbl =
1777 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1778 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1779 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1780 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1781 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1782 u8 start_action = tbl->action;
1783 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1784 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1785 int ret;
1786 u8 update_search_tbl_counter = 0;
1787
1788 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1789 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1790 tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1791 /* switch in SISO */
1792 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1793 }
1794 for (;;) {
1795 lq_sta->action_counter++;
1796 switch (tbl->action) {
1797 case IWL_MIMO3_SWITCH_ANTENNA1:
1798 case IWL_MIMO3_SWITCH_ANTENNA2:
1799 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
1800
1801 if (tx_chains_num <= 3)
1802 break;
1803
1804 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1805 break;
1806
1807 memcpy(search_tbl, tbl, sz);
1808 if (rs_toggle_antenna(valid_tx_ant,
1809 &search_tbl->current_rate, search_tbl))
1810 goto out;
1811 break;
1812 case IWL_MIMO3_SWITCH_SISO_A:
1813 case IWL_MIMO3_SWITCH_SISO_B:
1814 case IWL_MIMO3_SWITCH_SISO_C:
1815 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
1816
1817 /* Set up new search table for SISO */
1818 memcpy(search_tbl, tbl, sz);
1819
1820 if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
1821 search_tbl->ant_type = ANT_A;
1822 else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
1823 search_tbl->ant_type = ANT_B;
1824 else
1825 search_tbl->ant_type = ANT_C;
1826
1827 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1828 break;
1829
1830 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1831 search_tbl, index);
1832 if (!ret)
1833 goto out;
1834
1835 break;
1836
1837 case IWL_MIMO3_SWITCH_MIMO2_AB:
1838 case IWL_MIMO3_SWITCH_MIMO2_AC:
1839 case IWL_MIMO3_SWITCH_MIMO2_BC:
1840 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
1841
1842 memcpy(search_tbl, tbl, sz);
1843 search_tbl->is_SGI = 0;
1844 if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
1845 search_tbl->ant_type = ANT_AB;
1846 else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
1847 search_tbl->ant_type = ANT_AC;
1848 else
1849 search_tbl->ant_type = ANT_BC;
1850
1851 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1852 break;
1853
1854 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1855 search_tbl, index);
1856 if (!ret)
1857 goto out;
1858
1859 break;
1860
1861 case IWL_MIMO3_SWITCH_GI:
1862 if (!tbl->is_ht40 && !(ht_cap->cap &
1863 IEEE80211_HT_CAP_SGI_20))
1864 break;
1865 if (tbl->is_ht40 && !(ht_cap->cap &
1866 IEEE80211_HT_CAP_SGI_40))
1867 break;
1868
1869 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
1870
1871 /* Set up new search table for MIMO */
1872 memcpy(search_tbl, tbl, sz);
1873 search_tbl->is_SGI = !tbl->is_SGI;
1874 rs_set_expected_tpt_table(lq_sta, search_tbl);
1875 /*
1876 * If active table already uses the fastest possible
1877 * modulation (dual stream with short guard interval),
1878 * and it's working well, there's no need to look
1879 * for a better type of modulation!
1880 */
1881 if (tbl->is_SGI) {
1882 s32 tpt = lq_sta->last_tpt / 100;
1883 if (tpt >= search_tbl->expected_tpt[index])
1884 break;
1885 }
1886 search_tbl->current_rate =
1887 rate_n_flags_from_tbl(priv, search_tbl,
1888 index, is_green);
1889 update_search_tbl_counter = 1;
1890 goto out;
1891 }
1892 tbl->action++;
1893 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1894 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1895
1896 if (tbl->action == start_action)
1897 break;
1898 }
1899 search_tbl->lq_type = LQ_NONE;
1900 return 0;
1901 out:
1902 lq_sta->search_better_tbl = 1;
1903 tbl->action++;
1904 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1905 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1906 if (update_search_tbl_counter)
1907 search_tbl->action = tbl->action;
1908
1909 return 0;
1910
1911 }
1912
1913 /*
1914 * Check whether we should continue using same modulation mode, or
1915 * begin search for a new mode, based on:
1916 * 1) # tx successes or failures while using this mode
1917 * 2) # times calling this function
1918 * 3) elapsed time in this mode (not used, for now)
1919 */
1920 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta)
1921 {
1922 struct iwl_scale_tbl_info *tbl;
1923 int i;
1924 int active_tbl;
1925 int flush_interval_passed = 0;
1926 struct iwl_priv *priv;
1927
1928 priv = lq_sta->drv;
1929 active_tbl = lq_sta->active_tbl;
1930
1931 tbl = &(lq_sta->lq_info[active_tbl]);
1932
1933 /* If we've been disallowing search, see if we should now allow it */
1934 if (lq_sta->stay_in_tbl) {
1935
1936 /* Elapsed time using current modulation mode */
1937 if (lq_sta->flush_timer)
1938 flush_interval_passed =
1939 time_after(jiffies,
1940 (unsigned long)(lq_sta->flush_timer +
1941 IWL_RATE_SCALE_FLUSH_INTVL));
1942
1943 /*
1944 * Check if we should allow search for new modulation mode.
1945 * If many frames have failed or succeeded, or we've used
1946 * this same modulation for a long time, allow search, and
1947 * reset history stats that keep track of whether we should
1948 * allow a new search. Also (below) reset all bitmaps and
1949 * stats in active history.
1950 */
1951 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1952 (lq_sta->total_success > lq_sta->max_success_limit) ||
1953 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1954 && (flush_interval_passed))) {
1955 IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n:",
1956 lq_sta->total_failed,
1957 lq_sta->total_success,
1958 flush_interval_passed);
1959
1960 /* Allow search for new mode */
1961 lq_sta->stay_in_tbl = 0; /* only place reset */
1962 lq_sta->total_failed = 0;
1963 lq_sta->total_success = 0;
1964 lq_sta->flush_timer = 0;
1965
1966 /*
1967 * Else if we've used this modulation mode enough repetitions
1968 * (regardless of elapsed time or success/failure), reset
1969 * history bitmaps and rate-specific stats for all rates in
1970 * active table.
1971 */
1972 } else {
1973 lq_sta->table_count++;
1974 if (lq_sta->table_count >=
1975 lq_sta->table_count_limit) {
1976 lq_sta->table_count = 0;
1977
1978 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
1979 for (i = 0; i < IWL_RATE_COUNT; i++)
1980 rs_rate_scale_clear_window(
1981 &(tbl->win[i]));
1982 }
1983 }
1984
1985 /* If transitioning to allow "search", reset all history
1986 * bitmaps and stats in active table (this will become the new
1987 * "search" table). */
1988 if (!lq_sta->stay_in_tbl) {
1989 for (i = 0; i < IWL_RATE_COUNT; i++)
1990 rs_rate_scale_clear_window(&(tbl->win[i]));
1991 }
1992 }
1993 }
1994
1995 /*
1996 * setup rate table in uCode
1997 * return rate_n_flags as used in the table
1998 */
1999 static u32 rs_update_rate_tbl(struct iwl_priv *priv,
2000 struct iwl_lq_sta *lq_sta,
2001 struct iwl_scale_tbl_info *tbl,
2002 int index, u8 is_green)
2003 {
2004 u32 rate;
2005
2006 /* Update uCode's rate table. */
2007 rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2008 rs_fill_link_cmd(priv, lq_sta, rate);
2009 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2010
2011 return rate;
2012 }
2013
2014 /*
2015 * Do rate scaling and search for new modulation mode.
2016 */
2017 static void rs_rate_scale_perform(struct iwl_priv *priv,
2018 struct sk_buff *skb,
2019 struct ieee80211_sta *sta,
2020 struct iwl_lq_sta *lq_sta)
2021 {
2022 struct ieee80211_hw *hw = priv->hw;
2023 struct ieee80211_conf *conf = &hw->conf;
2024 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2025 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2026 int low = IWL_RATE_INVALID;
2027 int high = IWL_RATE_INVALID;
2028 int index;
2029 int i;
2030 struct iwl_rate_scale_data *window = NULL;
2031 int current_tpt = IWL_INVALID_VALUE;
2032 int low_tpt = IWL_INVALID_VALUE;
2033 int high_tpt = IWL_INVALID_VALUE;
2034 u32 fail_count;
2035 s8 scale_action = 0;
2036 u16 rate_mask;
2037 u8 update_lq = 0;
2038 struct iwl_scale_tbl_info *tbl, *tbl1;
2039 u16 rate_scale_index_msk = 0;
2040 u32 rate;
2041 u8 is_green = 0;
2042 u8 active_tbl = 0;
2043 u8 done_search = 0;
2044 u16 high_low;
2045 s32 sr;
2046 u8 tid = MAX_TID_COUNT;
2047 struct iwl_tid_data *tid_data;
2048
2049 IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
2050
2051 /* Send management frames and NO_ACK data using lowest rate. */
2052 /* TODO: this could probably be improved.. */
2053 if (!ieee80211_is_data(hdr->frame_control) ||
2054 info->flags & IEEE80211_TX_CTL_NO_ACK)
2055 return;
2056
2057 if (!sta || !lq_sta)
2058 return;
2059
2060 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
2061
2062 tid = rs_tl_add_packet(lq_sta, hdr);
2063 if ((tid != MAX_TID_COUNT) && (lq_sta->tx_agg_tid_en & (1 << tid))) {
2064 tid_data = &priv->stations[lq_sta->lq.sta_id].tid[tid];
2065 if (tid_data->agg.state == IWL_AGG_OFF)
2066 lq_sta->is_agg = 0;
2067 else
2068 lq_sta->is_agg = 1;
2069 } else
2070 lq_sta->is_agg = 0;
2071
2072 /*
2073 * Select rate-scale / modulation-mode table to work with in
2074 * the rest of this function: "search" if searching for better
2075 * modulation mode, or "active" if doing rate scaling within a mode.
2076 */
2077 if (!lq_sta->search_better_tbl)
2078 active_tbl = lq_sta->active_tbl;
2079 else
2080 active_tbl = 1 - lq_sta->active_tbl;
2081
2082 tbl = &(lq_sta->lq_info[active_tbl]);
2083 if (is_legacy(tbl->lq_type))
2084 lq_sta->is_green = 0;
2085 else
2086 lq_sta->is_green = rs_use_green(sta, &priv->current_ht_config);
2087 is_green = lq_sta->is_green;
2088
2089 /* current tx rate */
2090 index = lq_sta->last_txrate_idx;
2091
2092 IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2093 tbl->lq_type);
2094
2095 /* rates available for this association, and for modulation mode */
2096 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2097
2098 IWL_DEBUG_RATE(priv, "mask 0x%04X \n", rate_mask);
2099
2100 /* mask with station rate restriction */
2101 if (is_legacy(tbl->lq_type)) {
2102 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2103 /* supp_rates has no CCK bits in A mode */
2104 rate_scale_index_msk = (u16) (rate_mask &
2105 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2106 else
2107 rate_scale_index_msk = (u16) (rate_mask &
2108 lq_sta->supp_rates);
2109
2110 } else
2111 rate_scale_index_msk = rate_mask;
2112
2113 if (!rate_scale_index_msk)
2114 rate_scale_index_msk = rate_mask;
2115
2116 if (!((1 << index) & rate_scale_index_msk)) {
2117 IWL_ERR(priv, "Current Rate is not valid\n");
2118 if (lq_sta->search_better_tbl) {
2119 /* revert to active table if search table is not valid*/
2120 tbl->lq_type = LQ_NONE;
2121 lq_sta->search_better_tbl = 0;
2122 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2123 /* get "active" rate info */
2124 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2125 rate = rs_update_rate_tbl(priv, lq_sta,
2126 tbl, index, is_green);
2127 }
2128 return;
2129 }
2130
2131 /* Get expected throughput table and history window for current rate */
2132 if (!tbl->expected_tpt) {
2133 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2134 return;
2135 }
2136
2137 /* force user max rate if set by user */
2138 if ((lq_sta->max_rate_idx != -1) &&
2139 (lq_sta->max_rate_idx < index)) {
2140 index = lq_sta->max_rate_idx;
2141 update_lq = 1;
2142 window = &(tbl->win[index]);
2143 goto lq_update;
2144 }
2145
2146 window = &(tbl->win[index]);
2147
2148 /*
2149 * If there is not enough history to calculate actual average
2150 * throughput, keep analyzing results of more tx frames, without
2151 * changing rate or mode (bypass most of the rest of this function).
2152 * Set up new rate table in uCode only if old rate is not supported
2153 * in current association (use new rate found above).
2154 */
2155 fail_count = window->counter - window->success_counter;
2156 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2157 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2158 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2159 "for index %d\n",
2160 window->success_counter, window->counter, index);
2161
2162 /* Can't calculate this yet; not enough history */
2163 window->average_tpt = IWL_INVALID_VALUE;
2164
2165 /* Should we stay with this modulation mode,
2166 * or search for a new one? */
2167 rs_stay_in_table(lq_sta);
2168
2169 goto out;
2170 }
2171 /* Else we have enough samples; calculate estimate of
2172 * actual average throughput */
2173
2174 /* Sanity-check TPT calculations */
2175 BUG_ON(window->average_tpt != ((window->success_ratio *
2176 tbl->expected_tpt[index] + 64) / 128));
2177
2178 /* If we are searching for better modulation mode, check success. */
2179 if (lq_sta->search_better_tbl &&
2180 (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
2181 /* If good success, continue using the "search" mode;
2182 * no need to send new link quality command, since we're
2183 * continuing to use the setup that we've been trying. */
2184 if (window->average_tpt > lq_sta->last_tpt) {
2185
2186 IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2187 "suc=%d cur-tpt=%d old-tpt=%d\n",
2188 window->success_ratio,
2189 window->average_tpt,
2190 lq_sta->last_tpt);
2191
2192 if (!is_legacy(tbl->lq_type))
2193 lq_sta->enable_counter = 1;
2194
2195 /* Swap tables; "search" becomes "active" */
2196 lq_sta->active_tbl = active_tbl;
2197 current_tpt = window->average_tpt;
2198
2199 /* Else poor success; go back to mode in "active" table */
2200 } else {
2201
2202 IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2203 "suc=%d cur-tpt=%d old-tpt=%d\n",
2204 window->success_ratio,
2205 window->average_tpt,
2206 lq_sta->last_tpt);
2207
2208 /* Nullify "search" table */
2209 tbl->lq_type = LQ_NONE;
2210
2211 /* Revert to "active" table */
2212 active_tbl = lq_sta->active_tbl;
2213 tbl = &(lq_sta->lq_info[active_tbl]);
2214
2215 /* Revert to "active" rate and throughput info */
2216 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2217 current_tpt = lq_sta->last_tpt;
2218
2219 /* Need to set up a new rate table in uCode */
2220 update_lq = 1;
2221 }
2222
2223 /* Either way, we've made a decision; modulation mode
2224 * search is done, allow rate adjustment next time. */
2225 lq_sta->search_better_tbl = 0;
2226 done_search = 1; /* Don't switch modes below! */
2227 goto lq_update;
2228 }
2229
2230 /* (Else) not in search of better modulation mode, try for better
2231 * starting rate, while staying in this mode. */
2232 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2233 tbl->lq_type);
2234 low = high_low & 0xff;
2235 high = (high_low >> 8) & 0xff;
2236
2237 /* If user set max rate, dont allow higher than user constrain */
2238 if ((lq_sta->max_rate_idx != -1) &&
2239 (lq_sta->max_rate_idx < high))
2240 high = IWL_RATE_INVALID;
2241
2242 sr = window->success_ratio;
2243
2244 /* Collect measured throughputs for current and adjacent rates */
2245 current_tpt = window->average_tpt;
2246 if (low != IWL_RATE_INVALID)
2247 low_tpt = tbl->win[low].average_tpt;
2248 if (high != IWL_RATE_INVALID)
2249 high_tpt = tbl->win[high].average_tpt;
2250
2251 scale_action = 0;
2252
2253 /* Too many failures, decrease rate */
2254 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2255 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2256 scale_action = -1;
2257
2258 /* No throughput measured yet for adjacent rates; try increase. */
2259 } else if ((low_tpt == IWL_INVALID_VALUE) &&
2260 (high_tpt == IWL_INVALID_VALUE)) {
2261
2262 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2263 scale_action = 1;
2264 else if (low != IWL_RATE_INVALID)
2265 scale_action = 0;
2266 }
2267
2268 /* Both adjacent throughputs are measured, but neither one has better
2269 * throughput; we're using the best rate, don't change it! */
2270 else if ((low_tpt != IWL_INVALID_VALUE) &&
2271 (high_tpt != IWL_INVALID_VALUE) &&
2272 (low_tpt < current_tpt) &&
2273 (high_tpt < current_tpt))
2274 scale_action = 0;
2275
2276 /* At least one adjacent rate's throughput is measured,
2277 * and may have better performance. */
2278 else {
2279 /* Higher adjacent rate's throughput is measured */
2280 if (high_tpt != IWL_INVALID_VALUE) {
2281 /* Higher rate has better throughput */
2282 if (high_tpt > current_tpt &&
2283 sr >= IWL_RATE_INCREASE_TH) {
2284 scale_action = 1;
2285 } else {
2286 scale_action = 0;
2287 }
2288
2289 /* Lower adjacent rate's throughput is measured */
2290 } else if (low_tpt != IWL_INVALID_VALUE) {
2291 /* Lower rate has better throughput */
2292 if (low_tpt > current_tpt) {
2293 IWL_DEBUG_RATE(priv,
2294 "decrease rate because of low tpt\n");
2295 scale_action = -1;
2296 } else if (sr >= IWL_RATE_INCREASE_TH) {
2297 scale_action = 1;
2298 }
2299 }
2300 }
2301
2302 /* Sanity check; asked for decrease, but success rate or throughput
2303 * has been good at old rate. Don't change it. */
2304 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2305 ((sr > IWL_RATE_HIGH_TH) ||
2306 (current_tpt > (100 * tbl->expected_tpt[low]))))
2307 scale_action = 0;
2308 if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2309 scale_action = -1;
2310 if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
2311 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2312 scale_action = -1;
2313 switch (scale_action) {
2314 case -1:
2315 /* Decrease starting rate, update uCode's rate table */
2316 if (low != IWL_RATE_INVALID) {
2317 update_lq = 1;
2318 index = low;
2319 }
2320
2321 break;
2322 case 1:
2323 /* Increase starting rate, update uCode's rate table */
2324 if (high != IWL_RATE_INVALID) {
2325 update_lq = 1;
2326 index = high;
2327 }
2328
2329 break;
2330 case 0:
2331 /* No change */
2332 default:
2333 break;
2334 }
2335
2336 IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2337 "high %d type %d\n",
2338 index, scale_action, low, high, tbl->lq_type);
2339
2340 lq_update:
2341 /* Replace uCode's rate table for the destination station. */
2342 if (update_lq)
2343 rate = rs_update_rate_tbl(priv, lq_sta,
2344 tbl, index, is_green);
2345
2346 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
2347 /* Should we stay with this modulation mode,
2348 * or search for a new one? */
2349 rs_stay_in_table(lq_sta);
2350 }
2351 /*
2352 * Search for new modulation mode if we're:
2353 * 1) Not changing rates right now
2354 * 2) Not just finishing up a search
2355 * 3) Allowing a new search
2356 */
2357 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2358 /* Save current throughput to compare with "search" throughput*/
2359 lq_sta->last_tpt = current_tpt;
2360
2361 /* Select a new "search" modulation mode to try.
2362 * If one is found, set up the new "search" table. */
2363 if (is_legacy(tbl->lq_type))
2364 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2365 else if (is_siso(tbl->lq_type))
2366 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2367 else if (is_mimo2(tbl->lq_type))
2368 rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2369 else
2370 rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2371
2372 /* If new "search" mode was selected, set up in uCode table */
2373 if (lq_sta->search_better_tbl) {
2374 /* Access the "search" table, clear its history. */
2375 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2376 for (i = 0; i < IWL_RATE_COUNT; i++)
2377 rs_rate_scale_clear_window(&(tbl->win[i]));
2378
2379 /* Use new "search" start rate */
2380 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2381
2382 IWL_DEBUG_RATE(priv, "Switch current mcs: %X index: %d\n",
2383 tbl->current_rate, index);
2384 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2385 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2386 } else
2387 done_search = 1;
2388 }
2389
2390 if (done_search && !lq_sta->stay_in_tbl) {
2391 /* If the "active" (non-search) mode was legacy,
2392 * and we've tried switching antennas,
2393 * but we haven't been able to try HT modes (not available),
2394 * stay with best antenna legacy modulation for a while
2395 * before next round of mode comparisons. */
2396 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2397 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2398 lq_sta->action_counter > tbl1->max_search) {
2399 IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2400 rs_set_stay_in_table(priv, 1, lq_sta);
2401 }
2402
2403 /* If we're in an HT mode, and all 3 mode switch actions
2404 * have been tried and compared, stay in this best modulation
2405 * mode for a while before next round of mode comparisons. */
2406 if (lq_sta->enable_counter &&
2407 (lq_sta->action_counter >= tbl1->max_search) &&
2408 iwl_ht_enabled(priv)) {
2409 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2410 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2411 (tid != MAX_TID_COUNT)) {
2412 tid_data =
2413 &priv->stations[lq_sta->lq.sta_id].tid[tid];
2414 if (tid_data->agg.state == IWL_AGG_OFF) {
2415 IWL_DEBUG_RATE(priv,
2416 "try to aggregate tid %d\n",
2417 tid);
2418 rs_tl_turn_on_agg(priv, tid,
2419 lq_sta, sta);
2420 }
2421 }
2422 rs_set_stay_in_table(priv, 0, lq_sta);
2423 }
2424 }
2425
2426 out:
2427 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2428 i = index;
2429 lq_sta->last_txrate_idx = i;
2430
2431 return;
2432 }
2433
2434
2435 static void rs_initialize_lq(struct iwl_priv *priv,
2436 struct ieee80211_conf *conf,
2437 struct ieee80211_sta *sta,
2438 struct iwl_lq_sta *lq_sta)
2439 {
2440 struct iwl_scale_tbl_info *tbl;
2441 int rate_idx;
2442 int i;
2443 u32 rate;
2444 u8 use_green = rs_use_green(sta, &priv->current_ht_config);
2445 u8 active_tbl = 0;
2446 u8 valid_tx_ant;
2447
2448 if (!sta || !lq_sta)
2449 goto out;
2450
2451 i = lq_sta->last_txrate_idx;
2452
2453 if ((lq_sta->lq.sta_id == 0xff) &&
2454 (priv->iw_mode == NL80211_IFTYPE_ADHOC))
2455 goto out;
2456
2457 valid_tx_ant = priv->hw_params.valid_tx_ant;
2458
2459 if (!lq_sta->search_better_tbl)
2460 active_tbl = lq_sta->active_tbl;
2461 else
2462 active_tbl = 1 - lq_sta->active_tbl;
2463
2464 tbl = &(lq_sta->lq_info[active_tbl]);
2465
2466 if ((i < 0) || (i >= IWL_RATE_COUNT))
2467 i = 0;
2468
2469 rate = iwl_rates[i].plcp;
2470 tbl->ant_type = first_antenna(valid_tx_ant);
2471 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2472
2473 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2474 rate |= RATE_MCS_CCK_MSK;
2475
2476 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2477 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2478 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2479
2480 rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2481 tbl->current_rate = rate;
2482 rs_set_expected_tpt_table(lq_sta, tbl);
2483 rs_fill_link_cmd(NULL, lq_sta, rate);
2484 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2485 out:
2486 return;
2487 }
2488
2489 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2490 struct ieee80211_tx_rate_control *txrc)
2491 {
2492
2493 struct sk_buff *skb = txrc->skb;
2494 struct ieee80211_supported_band *sband = txrc->sband;
2495 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2496 struct ieee80211_conf *conf = &priv->hw->conf;
2497 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2498 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2499 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2500 struct iwl_lq_sta *lq_sta = priv_sta;
2501 int rate_idx;
2502
2503 IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2504
2505 /* Get max rate if user set max rate */
2506 if (lq_sta) {
2507 lq_sta->max_rate_idx = txrc->max_rate_idx;
2508 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2509 (lq_sta->max_rate_idx != -1))
2510 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2511 if ((lq_sta->max_rate_idx < 0) ||
2512 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2513 lq_sta->max_rate_idx = -1;
2514 }
2515
2516 /* Send management frames and NO_ACK data using lowest rate. */
2517 if (rate_control_send_low(sta, priv_sta, txrc))
2518 return;
2519
2520 rate_idx = lq_sta->last_txrate_idx;
2521
2522 if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
2523 !lq_sta->ibss_sta_added) {
2524 u8 sta_id = iwl_find_station(priv, hdr->addr1);
2525
2526 if (sta_id == IWL_INVALID_STATION) {
2527 IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n",
2528 hdr->addr1);
2529 sta_id = iwl_add_station(priv, hdr->addr1,
2530 false, CMD_ASYNC, ht_cap);
2531 }
2532 if ((sta_id != IWL_INVALID_STATION)) {
2533 lq_sta->lq.sta_id = sta_id;
2534 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2535 lq_sta->ibss_sta_added = 1;
2536 rs_initialize_lq(priv, conf, sta, lq_sta);
2537 }
2538 }
2539
2540 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2541 rate_idx -= IWL_FIRST_OFDM_RATE;
2542 /* 6M and 9M shared same MCS index */
2543 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2544 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2545 IWL_RATE_MIMO3_6M_PLCP)
2546 rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2547 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2548 IWL_RATE_MIMO2_6M_PLCP)
2549 rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2550 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2551 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2552 info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2553 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2554 info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
2555 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2556 info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2557 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2558 info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2559 } else {
2560 /* Check for invalid rates */
2561 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2562 ((sband->band == IEEE80211_BAND_5GHZ) &&
2563 (rate_idx < IWL_FIRST_OFDM_RATE)))
2564 rate_idx = rate_lowest_index(sband, sta);
2565 /* On valid 5 GHz rate, adjust index */
2566 else if (sband->band == IEEE80211_BAND_5GHZ)
2567 rate_idx -= IWL_FIRST_OFDM_RATE;
2568 info->control.rates[0].flags = 0;
2569 }
2570 info->control.rates[0].idx = rate_idx;
2571
2572 }
2573
2574 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2575 gfp_t gfp)
2576 {
2577 struct iwl_lq_sta *lq_sta;
2578 struct iwl_priv *priv;
2579 int i, j;
2580
2581 priv = (struct iwl_priv *)priv_rate;
2582 IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2583
2584 lq_sta = kzalloc(sizeof(struct iwl_lq_sta), gfp);
2585
2586 if (lq_sta == NULL)
2587 return NULL;
2588 lq_sta->lq.sta_id = 0xff;
2589
2590
2591 for (j = 0; j < LQ_SIZE; j++)
2592 for (i = 0; i < IWL_RATE_COUNT; i++)
2593 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2594
2595 return lq_sta;
2596 }
2597
2598 static void rs_rate_init(void *priv_r, struct ieee80211_supported_band *sband,
2599 struct ieee80211_sta *sta, void *priv_sta)
2600 {
2601 int i, j;
2602 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2603 struct ieee80211_conf *conf = &priv->hw->conf;
2604 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2605 struct iwl_lq_sta *lq_sta = priv_sta;
2606
2607 lq_sta->flush_timer = 0;
2608 lq_sta->supp_rates = sta->supp_rates[sband->band];
2609 for (j = 0; j < LQ_SIZE; j++)
2610 for (i = 0; i < IWL_RATE_COUNT; i++)
2611 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2612
2613 IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init ***\n");
2614 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2615 * the lowest or the highest rate.. Could consider using RSSI from
2616 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2617 * after assoc.. */
2618
2619 lq_sta->ibss_sta_added = 0;
2620 if (priv->iw_mode == NL80211_IFTYPE_AP) {
2621 u8 sta_id = iwl_find_station(priv,
2622 sta->addr);
2623
2624 /* for IBSS the call are from tasklet */
2625 IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n", sta->addr);
2626
2627 if (sta_id == IWL_INVALID_STATION) {
2628 IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n", sta->addr);
2629 sta_id = iwl_add_station(priv, sta->addr, false,
2630 CMD_ASYNC, ht_cap);
2631 }
2632 if ((sta_id != IWL_INVALID_STATION)) {
2633 lq_sta->lq.sta_id = sta_id;
2634 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2635 }
2636 /* FIXME: this is w/a remove it later */
2637 priv->assoc_station_added = 1;
2638 }
2639
2640 lq_sta->is_dup = 0;
2641 lq_sta->max_rate_idx = -1;
2642 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2643 lq_sta->is_green = rs_use_green(sta, &priv->current_ht_config);
2644 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2645 lq_sta->active_rate_basic = priv->active_rate_basic;
2646 lq_sta->band = priv->band;
2647 /*
2648 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2649 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2650 */
2651 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2652 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2653 lq_sta->active_siso_rate &= ~((u16)0x2);
2654 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2655
2656 /* Same here */
2657 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2658 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2659 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2660 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2661
2662 lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2663 lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2664 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2665 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2666
2667 IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2668 lq_sta->active_siso_rate,
2669 lq_sta->active_mimo2_rate,
2670 lq_sta->active_mimo3_rate);
2671
2672 /* These values will be overridden later */
2673 lq_sta->lq.general_params.single_stream_ant_msk = ANT_A;
2674 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2675
2676 /* as default allow aggregation for all tids */
2677 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2678 lq_sta->drv = priv;
2679
2680 /* Set last_txrate_idx to lowest rate */
2681 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2682 if (sband->band == IEEE80211_BAND_5GHZ)
2683 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2684 lq_sta->is_agg = 0;
2685
2686 rs_initialize_lq(priv, conf, sta, lq_sta);
2687 }
2688
2689 static void rs_fill_link_cmd(struct iwl_priv *priv,
2690 struct iwl_lq_sta *lq_sta, u32 new_rate)
2691 {
2692 struct iwl_scale_tbl_info tbl_type;
2693 int index = 0;
2694 int rate_idx;
2695 int repeat_rate = 0;
2696 u8 ant_toggle_cnt = 0;
2697 u8 use_ht_possible = 1;
2698 u8 valid_tx_ant = 0;
2699 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2700
2701 /* Override starting rate (index 0) if needed for debug purposes */
2702 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2703
2704 /* Interpret new_rate (rate_n_flags) */
2705 memset(&tbl_type, 0, sizeof(tbl_type));
2706 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2707 &tbl_type, &rate_idx);
2708
2709 /* How many times should we repeat the initial rate? */
2710 if (is_legacy(tbl_type.lq_type)) {
2711 ant_toggle_cnt = 1;
2712 repeat_rate = IWL_NUMBER_TRY;
2713 } else {
2714 repeat_rate = IWL_HT_NUMBER_TRY;
2715 }
2716
2717 lq_cmd->general_params.mimo_delimiter =
2718 is_mimo(tbl_type.lq_type) ? 1 : 0;
2719
2720 /* Fill 1st table entry (index 0) */
2721 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2722
2723 if (num_of_ant(tbl_type.ant_type) == 1) {
2724 lq_cmd->general_params.single_stream_ant_msk =
2725 tbl_type.ant_type;
2726 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2727 lq_cmd->general_params.dual_stream_ant_msk =
2728 tbl_type.ant_type;
2729 } /* otherwise we don't modify the existing value */
2730
2731 index++;
2732 repeat_rate--;
2733
2734 if (priv)
2735 valid_tx_ant = priv->hw_params.valid_tx_ant;
2736
2737 /* Fill rest of rate table */
2738 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2739 /* Repeat initial/next rate.
2740 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2741 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2742 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2743 if (is_legacy(tbl_type.lq_type)) {
2744 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2745 ant_toggle_cnt++;
2746 else if (priv &&
2747 rs_toggle_antenna(valid_tx_ant,
2748 &new_rate, &tbl_type))
2749 ant_toggle_cnt = 1;
2750 }
2751
2752 /* Override next rate if needed for debug purposes */
2753 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2754
2755 /* Fill next table entry */
2756 lq_cmd->rs_table[index].rate_n_flags =
2757 cpu_to_le32(new_rate);
2758 repeat_rate--;
2759 index++;
2760 }
2761
2762 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2763 &rate_idx);
2764
2765 /* Indicate to uCode which entries might be MIMO.
2766 * If initial rate was MIMO, this will finally end up
2767 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2768 if (is_mimo(tbl_type.lq_type))
2769 lq_cmd->general_params.mimo_delimiter = index;
2770
2771 /* Get next rate */
2772 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2773 use_ht_possible);
2774
2775 /* How many times should we repeat the next rate? */
2776 if (is_legacy(tbl_type.lq_type)) {
2777 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2778 ant_toggle_cnt++;
2779 else if (priv &&
2780 rs_toggle_antenna(valid_tx_ant,
2781 &new_rate, &tbl_type))
2782 ant_toggle_cnt = 1;
2783
2784 repeat_rate = IWL_NUMBER_TRY;
2785 } else {
2786 repeat_rate = IWL_HT_NUMBER_TRY;
2787 }
2788
2789 /* Don't allow HT rates after next pass.
2790 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2791 use_ht_possible = 0;
2792
2793 /* Override next rate if needed for debug purposes */
2794 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2795
2796 /* Fill next table entry */
2797 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2798
2799 index++;
2800 repeat_rate--;
2801 }
2802
2803 lq_cmd->agg_params.agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2804 lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2805 lq_cmd->agg_params.agg_time_limit =
2806 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2807 }
2808
2809 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2810 {
2811 return hw->priv;
2812 }
2813 /* rate scale requires free function to be implemented */
2814 static void rs_free(void *priv_rate)
2815 {
2816 return;
2817 }
2818
2819 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
2820 void *priv_sta)
2821 {
2822 struct iwl_lq_sta *lq_sta = priv_sta;
2823 struct iwl_priv *priv __maybe_unused = priv_r;
2824
2825 IWL_DEBUG_RATE(priv, "enter\n");
2826 kfree(lq_sta);
2827 IWL_DEBUG_RATE(priv, "leave\n");
2828 }
2829
2830
2831 #ifdef CONFIG_MAC80211_DEBUGFS
2832 static int open_file_generic(struct inode *inode, struct file *file)
2833 {
2834 file->private_data = inode->i_private;
2835 return 0;
2836 }
2837 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2838 u32 *rate_n_flags, int index)
2839 {
2840 struct iwl_priv *priv;
2841 u8 valid_tx_ant;
2842 u8 ant_sel_tx;
2843
2844 priv = lq_sta->drv;
2845 valid_tx_ant = priv->hw_params.valid_tx_ant;
2846 if (lq_sta->dbg_fixed_rate) {
2847 ant_sel_tx =
2848 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
2849 >> RATE_MCS_ANT_POS);
2850 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
2851 *rate_n_flags = lq_sta->dbg_fixed_rate;
2852 IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
2853 } else {
2854 lq_sta->dbg_fixed_rate = 0;
2855 IWL_ERR(priv,
2856 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
2857 ant_sel_tx, valid_tx_ant);
2858 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
2859 }
2860 } else {
2861 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
2862 }
2863 }
2864
2865 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2866 const char __user *user_buf, size_t count, loff_t *ppos)
2867 {
2868 struct iwl_lq_sta *lq_sta = file->private_data;
2869 struct iwl_priv *priv;
2870 char buf[64];
2871 int buf_size;
2872 u32 parsed_rate;
2873
2874 priv = lq_sta->drv;
2875 memset(buf, 0, sizeof(buf));
2876 buf_size = min(count, sizeof(buf) - 1);
2877 if (copy_from_user(buf, user_buf, buf_size))
2878 return -EFAULT;
2879
2880 if (sscanf(buf, "%x", &parsed_rate) == 1)
2881 lq_sta->dbg_fixed_rate = parsed_rate;
2882 else
2883 lq_sta->dbg_fixed_rate = 0;
2884
2885 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2886 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2887 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2888 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2889
2890 IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
2891 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2892
2893 if (lq_sta->dbg_fixed_rate) {
2894 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2895 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2896 }
2897
2898 return count;
2899 }
2900
2901 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2902 char __user *user_buf, size_t count, loff_t *ppos)
2903 {
2904 char *buff;
2905 int desc = 0;
2906 int i = 0;
2907 int index = 0;
2908 ssize_t ret;
2909
2910 struct iwl_lq_sta *lq_sta = file->private_data;
2911 struct iwl_priv *priv;
2912 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2913
2914 priv = lq_sta->drv;
2915 buff = kmalloc(1024, GFP_KERNEL);
2916 if (!buff)
2917 return -ENOMEM;
2918
2919 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2920 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2921 lq_sta->total_failed, lq_sta->total_success,
2922 lq_sta->active_legacy_rate);
2923 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2924 lq_sta->dbg_fixed_rate);
2925 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
2926 (priv->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
2927 (priv->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
2928 (priv->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
2929 desc += sprintf(buff+desc, "lq type %s\n",
2930 (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
2931 if (is_Ht(tbl->lq_type)) {
2932 desc += sprintf(buff+desc, " %s",
2933 (is_siso(tbl->lq_type)) ? "SISO" :
2934 ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
2935 desc += sprintf(buff+desc, " %s",
2936 (tbl->is_ht40) ? "40MHz" : "20MHz");
2937 desc += sprintf(buff+desc, " %s %s %s\n", (tbl->is_SGI) ? "SGI" : "",
2938 (lq_sta->is_green) ? "GF enabled" : "",
2939 (lq_sta->is_agg) ? "AGG on" : "");
2940 }
2941 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
2942 lq_sta->last_rate_n_flags);
2943 desc += sprintf(buff+desc, "general:"
2944 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2945 lq_sta->lq.general_params.flags,
2946 lq_sta->lq.general_params.mimo_delimiter,
2947 lq_sta->lq.general_params.single_stream_ant_msk,
2948 lq_sta->lq.general_params.dual_stream_ant_msk);
2949
2950 desc += sprintf(buff+desc, "agg:"
2951 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2952 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2953 lq_sta->lq.agg_params.agg_dis_start_th,
2954 lq_sta->lq.agg_params.agg_frame_cnt_limit);
2955
2956 desc += sprintf(buff+desc,
2957 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2958 lq_sta->lq.general_params.start_rate_index[0],
2959 lq_sta->lq.general_params.start_rate_index[1],
2960 lq_sta->lq.general_params.start_rate_index[2],
2961 lq_sta->lq.general_params.start_rate_index[3]);
2962
2963 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2964 index = iwl_hwrate_to_plcp_idx(
2965 le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2966 if (is_legacy(tbl->lq_type)) {
2967 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
2968 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
2969 iwl_rate_mcs[index].mbps);
2970 } else {
2971 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
2972 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
2973 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
2974 }
2975 }
2976
2977 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2978 kfree(buff);
2979 return ret;
2980 }
2981
2982 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2983 .write = rs_sta_dbgfs_scale_table_write,
2984 .read = rs_sta_dbgfs_scale_table_read,
2985 .open = open_file_generic,
2986 };
2987 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2988 char __user *user_buf, size_t count, loff_t *ppos)
2989 {
2990 char *buff;
2991 int desc = 0;
2992 int i, j;
2993 ssize_t ret;
2994
2995 struct iwl_lq_sta *lq_sta = file->private_data;
2996
2997 buff = kmalloc(1024, GFP_KERNEL);
2998 if (!buff)
2999 return -ENOMEM;
3000
3001 for (i = 0; i < LQ_SIZE; i++) {
3002 desc += sprintf(buff+desc,
3003 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
3004 "rate=0x%X\n",
3005 lq_sta->active_tbl == i ? "*" : "x",
3006 lq_sta->lq_info[i].lq_type,
3007 lq_sta->lq_info[i].is_SGI,
3008 lq_sta->lq_info[i].is_ht40,
3009 lq_sta->lq_info[i].is_dup,
3010 lq_sta->is_green,
3011 lq_sta->lq_info[i].current_rate);
3012 for (j = 0; j < IWL_RATE_COUNT; j++) {
3013 desc += sprintf(buff+desc,
3014 "counter=%d success=%d %%=%d\n",
3015 lq_sta->lq_info[i].win[j].counter,
3016 lq_sta->lq_info[i].win[j].success_counter,
3017 lq_sta->lq_info[i].win[j].success_ratio);
3018 }
3019 }
3020 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3021 kfree(buff);
3022 return ret;
3023 }
3024
3025 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3026 .read = rs_sta_dbgfs_stats_table_read,
3027 .open = open_file_generic,
3028 };
3029
3030 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3031 char __user *user_buf, size_t count, loff_t *ppos)
3032 {
3033 char buff[120];
3034 int desc = 0;
3035 ssize_t ret;
3036
3037 struct iwl_lq_sta *lq_sta = file->private_data;
3038 struct iwl_priv *priv;
3039 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3040
3041 priv = lq_sta->drv;
3042
3043 if (is_Ht(tbl->lq_type))
3044 desc += sprintf(buff+desc,
3045 "Bit Rate= %d Mb/s\n",
3046 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3047 else
3048 desc += sprintf(buff+desc,
3049 "Bit Rate= %d Mb/s\n",
3050 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3051 desc += sprintf(buff+desc,
3052 "Signal Level= %d dBm\tNoise Level= %d dBm\n",
3053 priv->last_rx_rssi, priv->last_rx_noise);
3054 desc += sprintf(buff+desc,
3055 "Tsf= 0x%llx\tBeacon time= 0x%08X\n",
3056 priv->last_tsf, priv->last_beacon_time);
3057
3058 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3059 return ret;
3060 }
3061
3062 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3063 .read = rs_sta_dbgfs_rate_scale_data_read,
3064 .open = open_file_generic,
3065 };
3066
3067 static void rs_add_debugfs(void *priv, void *priv_sta,
3068 struct dentry *dir)
3069 {
3070 struct iwl_lq_sta *lq_sta = priv_sta;
3071 lq_sta->rs_sta_dbgfs_scale_table_file =
3072 debugfs_create_file("rate_scale_table", 0600, dir,
3073 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3074 lq_sta->rs_sta_dbgfs_stats_table_file =
3075 debugfs_create_file("rate_stats_table", 0600, dir,
3076 lq_sta, &rs_sta_dbgfs_stats_table_ops);
3077 lq_sta->rs_sta_dbgfs_rate_scale_data_file =
3078 debugfs_create_file("rate_scale_data", 0600, dir,
3079 lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
3080 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
3081 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
3082 &lq_sta->tx_agg_tid_en);
3083
3084 }
3085
3086 static void rs_remove_debugfs(void *priv, void *priv_sta)
3087 {
3088 struct iwl_lq_sta *lq_sta = priv_sta;
3089 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3090 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
3091 debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
3092 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
3093 }
3094 #endif
3095
3096 static struct rate_control_ops rs_ops = {
3097 .module = NULL,
3098 .name = RS_NAME,
3099 .tx_status = rs_tx_status,
3100 .get_rate = rs_get_rate,
3101 .rate_init = rs_rate_init,
3102 .alloc = rs_alloc,
3103 .free = rs_free,
3104 .alloc_sta = rs_alloc_sta,
3105 .free_sta = rs_free_sta,
3106 #ifdef CONFIG_MAC80211_DEBUGFS
3107 .add_sta_debugfs = rs_add_debugfs,
3108 .remove_sta_debugfs = rs_remove_debugfs,
3109 #endif
3110 };
3111
3112 int iwlagn_rate_control_register(void)
3113 {
3114 return ieee80211_rate_control_register(&rs_ops);
3115 }
3116
3117 void iwlagn_rate_control_unregister(void)
3118 {
3119 ieee80211_rate_control_unregister(&rs_ops);
3120 }
3121
mm of the moment repository