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Merge tag 'v3.3.7' into 3.3/master
[zen-stable.git] / drivers / net / wireless / iwlegacy / 4965-rs.c
blob467d0cb14ecdf56213839126ac08ac8c03668834
1 /******************************************************************************
2 *
3 * Copyright(c) 2005 - 2011 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/slab.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 "common.h"
39 #include "4965.h"
40
41 #define IL4965_RS_NAME "iwl-4965-rs"
42
43 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
44 #define IL_NUMBER_TRY 1
45 #define IL_HT_NUMBER_TRY 3
46
47 #define RATE_MAX_WINDOW 62 /* # tx in history win */
48 #define RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
49 #define RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
50
51 /* max allowed rate miss before sync LQ cmd */
52 #define IL_MISSED_RATE_MAX 15
53 /* max time to accum history 2 seconds */
54 #define RATE_SCALE_FLUSH_INTVL (3*HZ)
55
56 static u8 rs_ht_to_legacy[] = {
57 RATE_6M_IDX, RATE_6M_IDX,
58 RATE_6M_IDX, RATE_6M_IDX,
59 RATE_6M_IDX,
60 RATE_6M_IDX, RATE_9M_IDX,
61 RATE_12M_IDX, RATE_18M_IDX,
62 RATE_24M_IDX, RATE_36M_IDX,
63 RATE_48M_IDX, RATE_54M_IDX
64 };
65
66 static const u8 ant_toggle_lookup[] = {
67 /*ANT_NONE -> */ ANT_NONE,
68 /*ANT_A -> */ ANT_B,
69 /*ANT_B -> */ ANT_C,
70 /*ANT_AB -> */ ANT_BC,
71 /*ANT_C -> */ ANT_A,
72 /*ANT_AC -> */ ANT_AB,
73 /*ANT_BC -> */ ANT_AC,
74 /*ANT_ABC -> */ ANT_ABC,
75 };
76
77 #define IL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np) \
78 [RATE_##r##M_IDX] = { RATE_##r##M_PLCP, \
79 RATE_SISO_##s##M_PLCP, \
80 RATE_MIMO2_##s##M_PLCP,\
81 RATE_##r##M_IEEE, \
82 RATE_##ip##M_IDX, \
83 RATE_##in##M_IDX, \
84 RATE_##rp##M_IDX, \
85 RATE_##rn##M_IDX, \
86 RATE_##pp##M_IDX, \
87 RATE_##np##M_IDX }
88
89 /*
90 * Parameter order:
91 * rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
92 *
93 * If there isn't a valid next or previous rate then INV is used which
94 * maps to RATE_INVALID
95 *
96 */
97 const struct il_rate_info il_rates[RATE_COUNT] = {
98 IL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2), /* 1mbps */
99 IL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5), /* 2mbps */
100 IL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11), /*5.5mbps */
101 IL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18), /* 11mbps */
102 IL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11), /* 6mbps */
103 IL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11), /* 9mbps */
104 IL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18), /* 12mbps */
105 IL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24), /* 18mbps */
106 IL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36), /* 24mbps */
107 IL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48), /* 36mbps */
108 IL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54), /* 48mbps */
109 IL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
110 IL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
111 };
112
113 static int
114 il4965_hwrate_to_plcp_idx(u32 rate_n_flags)
115 {
116 int idx = 0;
117
118 /* HT rate format */
119 if (rate_n_flags & RATE_MCS_HT_MSK) {
120 idx = (rate_n_flags & 0xff);
121
122 if (idx >= RATE_MIMO2_6M_PLCP)
123 idx = idx - RATE_MIMO2_6M_PLCP;
124
125 idx += IL_FIRST_OFDM_RATE;
126 /* skip 9M not supported in ht */
127 if (idx >= RATE_9M_IDX)
128 idx += 1;
129 if (idx >= IL_FIRST_OFDM_RATE && idx <= IL_LAST_OFDM_RATE)
130 return idx;
131
132 /* legacy rate format, search for match in table */
133 } else {
134 for (idx = 0; idx < ARRAY_SIZE(il_rates); idx++)
135 if (il_rates[idx].plcp == (rate_n_flags & 0xFF))
136 return idx;
137 }
138
139 return -1;
140 }
141
142 static void il4965_rs_rate_scale_perform(struct il_priv *il,
143 struct sk_buff *skb,
144 struct ieee80211_sta *sta,
145 struct il_lq_sta *lq_sta);
146 static void il4965_rs_fill_link_cmd(struct il_priv *il,
147 struct il_lq_sta *lq_sta, u32 rate_n_flags);
148 static void il4965_rs_stay_in_table(struct il_lq_sta *lq_sta,
149 bool force_search);
150
151 #ifdef CONFIG_MAC80211_DEBUGFS
152 static void il4965_rs_dbgfs_set_mcs(struct il_lq_sta *lq_sta,
153 u32 *rate_n_flags, int idx);
154 #else
155 static void
156 il4965_rs_dbgfs_set_mcs(struct il_lq_sta *lq_sta, u32 * rate_n_flags, int idx)
157 {
158 }
159 #endif
160
161 /**
162 * The following tables contain the expected throughput metrics for all rates
163 *
164 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
165 *
166 * where invalid entries are zeros.
167 *
168 * CCK rates are only valid in legacy table and will only be used in G
169 * (2.4 GHz) band.
170 */
171
172 static s32 expected_tpt_legacy[RATE_COUNT] = {
173 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
174 };
175
176 static s32 expected_tpt_siso20MHz[4][RATE_COUNT] = {
177 {0, 0, 0, 0, 42, 0, 76, 102, 124, 158, 183, 193, 202}, /* Norm */
178 {0, 0, 0, 0, 46, 0, 82, 110, 132, 167, 192, 202, 210}, /* SGI */
179 {0, 0, 0, 0, 48, 0, 93, 135, 176, 251, 319, 351, 381}, /* AGG */
180 {0, 0, 0, 0, 53, 0, 102, 149, 193, 275, 348, 381, 413}, /* AGG+SGI */
181 };
182
183 static s32 expected_tpt_siso40MHz[4][RATE_COUNT] = {
184 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
185 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
186 {0, 0, 0, 0, 96, 0, 182, 259, 328, 451, 553, 598, 640}, /* AGG */
187 {0, 0, 0, 0, 106, 0, 199, 282, 357, 487, 593, 640, 683}, /* AGG+SGI */
188 };
189
190 static s32 expected_tpt_mimo2_20MHz[4][RATE_COUNT] = {
191 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250}, /* Norm */
192 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256}, /* SGI */
193 {0, 0, 0, 0, 92, 0, 175, 250, 317, 436, 534, 578, 619}, /* AGG */
194 {0, 0, 0, 0, 102, 0, 192, 273, 344, 470, 573, 619, 660}, /* AGG+SGI */
195 };
196
197 static s32 expected_tpt_mimo2_40MHz[4][RATE_COUNT] = {
198 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
199 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
200 {0, 0, 0, 0, 180, 0, 327, 446, 545, 708, 828, 878, 922}, /* AGG */
201 {0, 0, 0, 0, 197, 0, 355, 481, 584, 752, 872, 922, 966}, /* AGG+SGI */
202 };
203
204 /* mbps, mcs */
205 static const struct il_rate_mcs_info il_rate_mcs[RATE_COUNT] = {
206 {"1", "BPSK DSSS"},
207 {"2", "QPSK DSSS"},
208 {"5.5", "BPSK CCK"},
209 {"11", "QPSK CCK"},
210 {"6", "BPSK 1/2"},
211 {"9", "BPSK 1/2"},
212 {"12", "QPSK 1/2"},
213 {"18", "QPSK 3/4"},
214 {"24", "16QAM 1/2"},
215 {"36", "16QAM 3/4"},
216 {"48", "64QAM 2/3"},
217 {"54", "64QAM 3/4"},
218 {"60", "64QAM 5/6"},
219 };
220
221 #define MCS_IDX_PER_STREAM (8)
222
223 static inline u8
224 il4965_rs_extract_rate(u32 rate_n_flags)
225 {
226 return (u8) (rate_n_flags & 0xFF);
227 }
228
229 static void
230 il4965_rs_rate_scale_clear_win(struct il_rate_scale_data *win)
231 {
232 win->data = 0;
233 win->success_counter = 0;
234 win->success_ratio = IL_INVALID_VALUE;
235 win->counter = 0;
236 win->average_tpt = IL_INVALID_VALUE;
237 win->stamp = 0;
238 }
239
240 static inline u8
241 il4965_rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
242 {
243 return (ant_type & valid_antenna) == ant_type;
244 }
245
246 /*
247 * removes the old data from the stats. All data that is older than
248 * TID_MAX_TIME_DIFF, will be deleted.
249 */
250 static void
251 il4965_rs_tl_rm_old_stats(struct il_traffic_load *tl, u32 curr_time)
252 {
253 /* The oldest age we want to keep */
254 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
255
256 while (tl->queue_count && tl->time_stamp < oldest_time) {
257 tl->total -= tl->packet_count[tl->head];
258 tl->packet_count[tl->head] = 0;
259 tl->time_stamp += TID_QUEUE_CELL_SPACING;
260 tl->queue_count--;
261 tl->head++;
262 if (tl->head >= TID_QUEUE_MAX_SIZE)
263 tl->head = 0;
264 }
265 }
266
267 /*
268 * increment traffic load value for tid and also remove
269 * any old values if passed the certain time period
270 */
271 static u8
272 il4965_rs_tl_add_packet(struct il_lq_sta *lq_data, struct ieee80211_hdr *hdr)
273 {
274 u32 curr_time = jiffies_to_msecs(jiffies);
275 u32 time_diff;
276 s32 idx;
277 struct il_traffic_load *tl = NULL;
278 u8 tid;
279
280 if (ieee80211_is_data_qos(hdr->frame_control)) {
281 u8 *qc = ieee80211_get_qos_ctl(hdr);
282 tid = qc[0] & 0xf;
283 } else
284 return MAX_TID_COUNT;
285
286 if (unlikely(tid >= TID_MAX_LOAD_COUNT))
287 return MAX_TID_COUNT;
288
289 tl = &lq_data->load[tid];
290
291 curr_time -= curr_time % TID_ROUND_VALUE;
292
293 /* Happens only for the first packet. Initialize the data */
294 if (!(tl->queue_count)) {
295 tl->total = 1;
296 tl->time_stamp = curr_time;
297 tl->queue_count = 1;
298 tl->head = 0;
299 tl->packet_count[0] = 1;
300 return MAX_TID_COUNT;
301 }
302
303 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
304 idx = time_diff / TID_QUEUE_CELL_SPACING;
305
306 /* The history is too long: remove data that is older than */
307 /* TID_MAX_TIME_DIFF */
308 if (idx >= TID_QUEUE_MAX_SIZE)
309 il4965_rs_tl_rm_old_stats(tl, curr_time);
310
311 idx = (tl->head + idx) % TID_QUEUE_MAX_SIZE;
312 tl->packet_count[idx] = tl->packet_count[idx] + 1;
313 tl->total = tl->total + 1;
314
315 if ((idx + 1) > tl->queue_count)
316 tl->queue_count = idx + 1;
317
318 return tid;
319 }
320
321 /*
322 get the traffic load value for tid
323 */
324 static u32
325 il4965_rs_tl_get_load(struct il_lq_sta *lq_data, u8 tid)
326 {
327 u32 curr_time = jiffies_to_msecs(jiffies);
328 u32 time_diff;
329 s32 idx;
330 struct il_traffic_load *tl = NULL;
331
332 if (tid >= TID_MAX_LOAD_COUNT)
333 return 0;
334
335 tl = &(lq_data->load[tid]);
336
337 curr_time -= curr_time % TID_ROUND_VALUE;
338
339 if (!(tl->queue_count))
340 return 0;
341
342 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
343 idx = time_diff / TID_QUEUE_CELL_SPACING;
344
345 /* The history is too long: remove data that is older than */
346 /* TID_MAX_TIME_DIFF */
347 if (idx >= TID_QUEUE_MAX_SIZE)
348 il4965_rs_tl_rm_old_stats(tl, curr_time);
349
350 return tl->total;
351 }
352
353 static int
354 il4965_rs_tl_turn_on_agg_for_tid(struct il_priv *il, struct il_lq_sta *lq_data,
355 u8 tid, struct ieee80211_sta *sta)
356 {
357 int ret = -EAGAIN;
358 u32 load;
359
360 load = il4965_rs_tl_get_load(lq_data, tid);
361
362 if (load > IL_AGG_LOAD_THRESHOLD) {
363 D_HT("Starting Tx agg: STA: %pM tid: %d\n", sta->addr, tid);
364 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
365 if (ret == -EAGAIN) {
366 /*
367 * driver and mac80211 is out of sync
368 * this might be cause by reloading firmware
369 * stop the tx ba session here
370 */
371 IL_ERR("Fail start Tx agg on tid: %d\n", tid);
372 ieee80211_stop_tx_ba_session(sta, tid);
373 }
374 } else
375 D_HT("Aggregation not enabled for tid %d because load = %u\n",
376 tid, load);
377
378 return ret;
379 }
380
381 static void
382 il4965_rs_tl_turn_on_agg(struct il_priv *il, u8 tid, struct il_lq_sta *lq_data,
383 struct ieee80211_sta *sta)
384 {
385 if (tid < TID_MAX_LOAD_COUNT)
386 il4965_rs_tl_turn_on_agg_for_tid(il, lq_data, tid, sta);
387 else
388 IL_ERR("tid exceeds max load count: %d/%d\n", tid,
389 TID_MAX_LOAD_COUNT);
390 }
391
392 static inline int
393 il4965_get_il4965_num_of_ant_from_rate(u32 rate_n_flags)
394 {
395 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
396 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
397 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
398 }
399
400 /*
401 * Static function to get the expected throughput from an il_scale_tbl_info
402 * that wraps a NULL pointer check
403 */
404 static s32
405 il4965_get_expected_tpt(struct il_scale_tbl_info *tbl, int rs_idx)
406 {
407 if (tbl->expected_tpt)
408 return tbl->expected_tpt[rs_idx];
409 return 0;
410 }
411
412 /**
413 * il4965_rs_collect_tx_data - Update the success/failure sliding win
414 *
415 * We keep a sliding win of the last 62 packets transmitted
416 * at this rate. win->data contains the bitmask of successful
417 * packets.
418 */
419 static int
420 il4965_rs_collect_tx_data(struct il_scale_tbl_info *tbl, int scale_idx,
421 int attempts, int successes)
422 {
423 struct il_rate_scale_data *win = NULL;
424 static const u64 mask = (((u64) 1) << (RATE_MAX_WINDOW - 1));
425 s32 fail_count, tpt;
426
427 if (scale_idx < 0 || scale_idx >= RATE_COUNT)
428 return -EINVAL;
429
430 /* Select win for current tx bit rate */
431 win = &(tbl->win[scale_idx]);
432
433 /* Get expected throughput */
434 tpt = il4965_get_expected_tpt(tbl, scale_idx);
435
436 /*
437 * Keep track of only the latest 62 tx frame attempts in this rate's
438 * history win; anything older isn't really relevant any more.
439 * If we have filled up the sliding win, drop the oldest attempt;
440 * if the oldest attempt (highest bit in bitmap) shows "success",
441 * subtract "1" from the success counter (this is the main reason
442 * we keep these bitmaps!).
443 */
444 while (attempts > 0) {
445 if (win->counter >= RATE_MAX_WINDOW) {
446
447 /* remove earliest */
448 win->counter = RATE_MAX_WINDOW - 1;
449
450 if (win->data & mask) {
451 win->data &= ~mask;
452 win->success_counter--;
453 }
454 }
455
456 /* Increment frames-attempted counter */
457 win->counter++;
458
459 /* Shift bitmap by one frame to throw away oldest history */
460 win->data <<= 1;
461
462 /* Mark the most recent #successes attempts as successful */
463 if (successes > 0) {
464 win->success_counter++;
465 win->data |= 0x1;
466 successes--;
467 }
468
469 attempts--;
470 }
471
472 /* Calculate current success ratio, avoid divide-by-0! */
473 if (win->counter > 0)
474 win->success_ratio =
475 128 * (100 * win->success_counter) / win->counter;
476 else
477 win->success_ratio = IL_INVALID_VALUE;
478
479 fail_count = win->counter - win->success_counter;
480
481 /* Calculate average throughput, if we have enough history. */
482 if (fail_count >= RATE_MIN_FAILURE_TH ||
483 win->success_counter >= RATE_MIN_SUCCESS_TH)
484 win->average_tpt = (win->success_ratio * tpt + 64) / 128;
485 else
486 win->average_tpt = IL_INVALID_VALUE;
487
488 /* Tag this win as having been updated */
489 win->stamp = jiffies;
490
491 return 0;
492 }
493
494 /*
495 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
496 */
497 static u32
498 il4965_rate_n_flags_from_tbl(struct il_priv *il, struct il_scale_tbl_info *tbl,
499 int idx, u8 use_green)
500 {
501 u32 rate_n_flags = 0;
502
503 if (is_legacy(tbl->lq_type)) {
504 rate_n_flags = il_rates[idx].plcp;
505 if (idx >= IL_FIRST_CCK_RATE && idx <= IL_LAST_CCK_RATE)
506 rate_n_flags |= RATE_MCS_CCK_MSK;
507
508 } else if (is_Ht(tbl->lq_type)) {
509 if (idx > IL_LAST_OFDM_RATE) {
510 IL_ERR("Invalid HT rate idx %d\n", idx);
511 idx = IL_LAST_OFDM_RATE;
512 }
513 rate_n_flags = RATE_MCS_HT_MSK;
514
515 if (is_siso(tbl->lq_type))
516 rate_n_flags |= il_rates[idx].plcp_siso;
517 else
518 rate_n_flags |= il_rates[idx].plcp_mimo2;
519 } else {
520 IL_ERR("Invalid tbl->lq_type %d\n", tbl->lq_type);
521 }
522
523 rate_n_flags |=
524 ((tbl->ant_type << RATE_MCS_ANT_POS) & RATE_MCS_ANT_ABC_MSK);
525
526 if (is_Ht(tbl->lq_type)) {
527 if (tbl->is_ht40) {
528 if (tbl->is_dup)
529 rate_n_flags |= RATE_MCS_DUP_MSK;
530 else
531 rate_n_flags |= RATE_MCS_HT40_MSK;
532 }
533 if (tbl->is_SGI)
534 rate_n_flags |= RATE_MCS_SGI_MSK;
535
536 if (use_green) {
537 rate_n_flags |= RATE_MCS_GF_MSK;
538 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
539 rate_n_flags &= ~RATE_MCS_SGI_MSK;
540 IL_ERR("GF was set with SGI:SISO\n");
541 }
542 }
543 }
544 return rate_n_flags;
545 }
546
547 /*
548 * Interpret uCode API's rate_n_flags format,
549 * fill "search" or "active" tx mode table.
550 */
551 static int
552 il4965_rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
553 enum ieee80211_band band,
554 struct il_scale_tbl_info *tbl, int *rate_idx)
555 {
556 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
557 u8 il4965_num_of_ant =
558 il4965_get_il4965_num_of_ant_from_rate(rate_n_flags);
559 u8 mcs;
560
561 memset(tbl, 0, sizeof(struct il_scale_tbl_info));
562 *rate_idx = il4965_hwrate_to_plcp_idx(rate_n_flags);
563
564 if (*rate_idx == RATE_INVALID) {
565 *rate_idx = -1;
566 return -EINVAL;
567 }
568 tbl->is_SGI = 0; /* default legacy setup */
569 tbl->is_ht40 = 0;
570 tbl->is_dup = 0;
571 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
572 tbl->lq_type = LQ_NONE;
573 tbl->max_search = IL_MAX_SEARCH;
574
575 /* legacy rate format */
576 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
577 if (il4965_num_of_ant == 1) {
578 if (band == IEEE80211_BAND_5GHZ)
579 tbl->lq_type = LQ_A;
580 else
581 tbl->lq_type = LQ_G;
582 }
583 /* HT rate format */
584 } else {
585 if (rate_n_flags & RATE_MCS_SGI_MSK)
586 tbl->is_SGI = 1;
587
588 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
589 (rate_n_flags & RATE_MCS_DUP_MSK))
590 tbl->is_ht40 = 1;
591
592 if (rate_n_flags & RATE_MCS_DUP_MSK)
593 tbl->is_dup = 1;
594
595 mcs = il4965_rs_extract_rate(rate_n_flags);
596
597 /* SISO */
598 if (mcs <= RATE_SISO_60M_PLCP) {
599 if (il4965_num_of_ant == 1)
600 tbl->lq_type = LQ_SISO; /*else NONE */
601 /* MIMO2 */
602 } else {
603 if (il4965_num_of_ant == 2)
604 tbl->lq_type = LQ_MIMO2;
605 }
606 }
607 return 0;
608 }
609
610 /* switch to another antenna/antennas and return 1 */
611 /* if no other valid antenna found, return 0 */
612 static int
613 il4965_rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
614 struct il_scale_tbl_info *tbl)
615 {
616 u8 new_ant_type;
617
618 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
619 return 0;
620
621 if (!il4965_rs_is_valid_ant(valid_ant, tbl->ant_type))
622 return 0;
623
624 new_ant_type = ant_toggle_lookup[tbl->ant_type];
625
626 while (new_ant_type != tbl->ant_type &&
627 !il4965_rs_is_valid_ant(valid_ant, new_ant_type))
628 new_ant_type = ant_toggle_lookup[new_ant_type];
629
630 if (new_ant_type == tbl->ant_type)
631 return 0;
632
633 tbl->ant_type = new_ant_type;
634 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
635 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
636 return 1;
637 }
638
639 /**
640 * Green-field mode is valid if the station supports it and
641 * there are no non-GF stations present in the BSS.
642 */
643 static bool
644 il4965_rs_use_green(struct ieee80211_sta *sta)
645 {
646 struct il_station_priv *sta_priv = (void *)sta->drv_priv;
647 struct il_rxon_context *ctx = sta_priv->common.ctx;
648
649 return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
650 !(ctx->ht.non_gf_sta_present);
651 }
652
653 /**
654 * il4965_rs_get_supported_rates - get the available rates
655 *
656 * if management frame or broadcast frame only return
657 * basic available rates.
658 *
659 */
660 static u16
661 il4965_rs_get_supported_rates(struct il_lq_sta *lq_sta,
662 struct ieee80211_hdr *hdr,
663 enum il_table_type rate_type)
664 {
665 if (is_legacy(rate_type)) {
666 return lq_sta->active_legacy_rate;
667 } else {
668 if (is_siso(rate_type))
669 return lq_sta->active_siso_rate;
670 else
671 return lq_sta->active_mimo2_rate;
672 }
673 }
674
675 static u16
676 il4965_rs_get_adjacent_rate(struct il_priv *il, u8 idx, u16 rate_mask,
677 int rate_type)
678 {
679 u8 high = RATE_INVALID;
680 u8 low = RATE_INVALID;
681
682 /* 802.11A or ht walks to the next literal adjacent rate in
683 * the rate table */
684 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
685 int i;
686 u32 mask;
687
688 /* Find the previous rate that is in the rate mask */
689 i = idx - 1;
690 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
691 if (rate_mask & mask) {
692 low = i;
693 break;
694 }
695 }
696
697 /* Find the next rate that is in the rate mask */
698 i = idx + 1;
699 for (mask = (1 << i); i < RATE_COUNT; i++, mask <<= 1) {
700 if (rate_mask & mask) {
701 high = i;
702 break;
703 }
704 }
705
706 return (high << 8) | low;
707 }
708
709 low = idx;
710 while (low != RATE_INVALID) {
711 low = il_rates[low].prev_rs;
712 if (low == RATE_INVALID)
713 break;
714 if (rate_mask & (1 << low))
715 break;
716 D_RATE("Skipping masked lower rate: %d\n", low);
717 }
718
719 high = idx;
720 while (high != RATE_INVALID) {
721 high = il_rates[high].next_rs;
722 if (high == RATE_INVALID)
723 break;
724 if (rate_mask & (1 << high))
725 break;
726 D_RATE("Skipping masked higher rate: %d\n", high);
727 }
728
729 return (high << 8) | low;
730 }
731
732 static u32
733 il4965_rs_get_lower_rate(struct il_lq_sta *lq_sta,
734 struct il_scale_tbl_info *tbl, u8 scale_idx,
735 u8 ht_possible)
736 {
737 s32 low;
738 u16 rate_mask;
739 u16 high_low;
740 u8 switch_to_legacy = 0;
741 u8 is_green = lq_sta->is_green;
742 struct il_priv *il = lq_sta->drv;
743
744 /* check if we need to switch from HT to legacy rates.
745 * assumption is that mandatory rates (1Mbps or 6Mbps)
746 * are always supported (spec demand) */
747 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_idx)) {
748 switch_to_legacy = 1;
749 scale_idx = rs_ht_to_legacy[scale_idx];
750 if (lq_sta->band == IEEE80211_BAND_5GHZ)
751 tbl->lq_type = LQ_A;
752 else
753 tbl->lq_type = LQ_G;
754
755 if (il4965_num_of_ant(tbl->ant_type) > 1)
756 tbl->ant_type =
757 il4965_first_antenna(il->hw_params.valid_tx_ant);
758
759 tbl->is_ht40 = 0;
760 tbl->is_SGI = 0;
761 tbl->max_search = IL_MAX_SEARCH;
762 }
763
764 rate_mask = il4965_rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
765
766 /* Mask with station rate restriction */
767 if (is_legacy(tbl->lq_type)) {
768 /* supp_rates has no CCK bits in A mode */
769 if (lq_sta->band == IEEE80211_BAND_5GHZ)
770 rate_mask =
771 (u16) (rate_mask &
772 (lq_sta->supp_rates << IL_FIRST_OFDM_RATE));
773 else
774 rate_mask = (u16) (rate_mask & lq_sta->supp_rates);
775 }
776
777 /* If we switched from HT to legacy, check current rate */
778 if (switch_to_legacy && (rate_mask & (1 << scale_idx))) {
779 low = scale_idx;
780 goto out;
781 }
782
783 high_low =
784 il4965_rs_get_adjacent_rate(lq_sta->drv, scale_idx, rate_mask,
785 tbl->lq_type);
786 low = high_low & 0xff;
787
788 if (low == RATE_INVALID)
789 low = scale_idx;
790
791 out:
792 return il4965_rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
793 }
794
795 /*
796 * Simple function to compare two rate scale table types
797 */
798 static bool
799 il4965_table_type_matches(struct il_scale_tbl_info *a,
800 struct il_scale_tbl_info *b)
801 {
802 return (a->lq_type == b->lq_type && a->ant_type == b->ant_type &&
803 a->is_SGI == b->is_SGI);
804 }
805
806 /*
807 * mac80211 sends us Tx status
808 */
809 static void
810 il4965_rs_tx_status(void *il_r, struct ieee80211_supported_band *sband,
811 struct ieee80211_sta *sta, void *il_sta,
812 struct sk_buff *skb)
813 {
814 int legacy_success;
815 int retries;
816 int rs_idx, mac_idx, i;
817 struct il_lq_sta *lq_sta = il_sta;
818 struct il_link_quality_cmd *table;
819 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
820 struct il_priv *il = (struct il_priv *)il_r;
821 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
822 enum mac80211_rate_control_flags mac_flags;
823 u32 tx_rate;
824 struct il_scale_tbl_info tbl_type;
825 struct il_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
826 struct il_station_priv *sta_priv = (void *)sta->drv_priv;
827 struct il_rxon_context *ctx = sta_priv->common.ctx;
828
829 D_RATE("get frame ack response, update rate scale win\n");
830
831 /* Treat uninitialized rate scaling data same as non-existing. */
832 if (!lq_sta) {
833 D_RATE("Station rate scaling not created yet.\n");
834 return;
835 } else if (!lq_sta->drv) {
836 D_RATE("Rate scaling not initialized yet.\n");
837 return;
838 }
839
840 if (!ieee80211_is_data(hdr->frame_control) ||
841 (info->flags & IEEE80211_TX_CTL_NO_ACK))
842 return;
843
844 /* This packet was aggregated but doesn't carry status info */
845 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
846 !(info->flags & IEEE80211_TX_STAT_AMPDU))
847 return;
848
849 /*
850 * Ignore this Tx frame response if its initial rate doesn't match
851 * that of latest Link Quality command. There may be stragglers
852 * from a previous Link Quality command, but we're no longer interested
853 * in those; they're either from the "active" mode while we're trying
854 * to check "search" mode, or a prior "search" mode after we've moved
855 * to a new "search" mode (which might become the new "active" mode).
856 */
857 table = &lq_sta->lq;
858 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
859 il4965_rs_get_tbl_info_from_mcs(tx_rate, il->band, &tbl_type, &rs_idx);
860 if (il->band == IEEE80211_BAND_5GHZ)
861 rs_idx -= IL_FIRST_OFDM_RATE;
862 mac_flags = info->status.rates[0].flags;
863 mac_idx = info->status.rates[0].idx;
864 /* For HT packets, map MCS to PLCP */
865 if (mac_flags & IEEE80211_TX_RC_MCS) {
866 mac_idx &= RATE_MCS_CODE_MSK; /* Remove # of streams */
867 if (mac_idx >= (RATE_9M_IDX - IL_FIRST_OFDM_RATE))
868 mac_idx++;
869 /*
870 * mac80211 HT idx is always zero-idxed; we need to move
871 * HT OFDM rates after CCK rates in 2.4 GHz band
872 */
873 if (il->band == IEEE80211_BAND_2GHZ)
874 mac_idx += IL_FIRST_OFDM_RATE;
875 }
876 /* Here we actually compare this rate to the latest LQ command */
877 if (mac_idx < 0 ||
878 tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI) ||
879 tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH) ||
880 tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA) ||
881 tbl_type.ant_type != info->antenna_sel_tx ||
882 !!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)
883 || !!(tx_rate & RATE_MCS_GF_MSK) !=
884 !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD) || rs_idx != mac_idx) {
885 D_RATE("initial rate %d does not match %d (0x%x)\n", mac_idx,
886 rs_idx, tx_rate);
887 /*
888 * Since rates mis-match, the last LQ command may have failed.
889 * After IL_MISSED_RATE_MAX mis-matches, resync the uCode with
890 * ... driver.
891 */
892 lq_sta->missed_rate_counter++;
893 if (lq_sta->missed_rate_counter > IL_MISSED_RATE_MAX) {
894 lq_sta->missed_rate_counter = 0;
895 il_send_lq_cmd(il, ctx, &lq_sta->lq, CMD_ASYNC, false);
896 }
897 /* Regardless, ignore this status info for outdated rate */
898 return;
899 } else
900 /* Rate did match, so reset the missed_rate_counter */
901 lq_sta->missed_rate_counter = 0;
902
903 /* Figure out if rate scale algorithm is in active or search table */
904 if (il4965_table_type_matches
905 (&tbl_type, &(lq_sta->lq_info[lq_sta->active_tbl]))) {
906 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
907 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
908 } else
909 if (il4965_table_type_matches
910 (&tbl_type, &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
911 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
912 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
913 } else {
914 D_RATE("Neither active nor search matches tx rate\n");
915 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
916 D_RATE("active- lq:%x, ant:%x, SGI:%d\n", tmp_tbl->lq_type,
917 tmp_tbl->ant_type, tmp_tbl->is_SGI);
918 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
919 D_RATE("search- lq:%x, ant:%x, SGI:%d\n", tmp_tbl->lq_type,
920 tmp_tbl->ant_type, tmp_tbl->is_SGI);
921 D_RATE("actual- lq:%x, ant:%x, SGI:%d\n", tbl_type.lq_type,
922 tbl_type.ant_type, tbl_type.is_SGI);
923 /*
924 * no matching table found, let's by-pass the data collection
925 * and continue to perform rate scale to find the rate table
926 */
927 il4965_rs_stay_in_table(lq_sta, true);
928 goto done;
929 }
930
931 /*
932 * Updating the frame history depends on whether packets were
933 * aggregated.
934 *
935 * For aggregation, all packets were transmitted at the same rate, the
936 * first idx into rate scale table.
937 */
938 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
939 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
940 il4965_rs_get_tbl_info_from_mcs(tx_rate, il->band, &tbl_type,
941 &rs_idx);
942 il4965_rs_collect_tx_data(curr_tbl, rs_idx,
943 info->status.ampdu_len,
944 info->status.ampdu_ack_len);
945
946 /* Update success/fail counts if not searching for new mode */
947 if (lq_sta->stay_in_tbl) {
948 lq_sta->total_success += info->status.ampdu_ack_len;
949 lq_sta->total_failed +=
950 (info->status.ampdu_len -
951 info->status.ampdu_ack_len);
952 }
953 } else {
954 /*
955 * For legacy, update frame history with for each Tx retry.
956 */
957 retries = info->status.rates[0].count - 1;
958 /* HW doesn't send more than 15 retries */
959 retries = min(retries, 15);
960
961 /* The last transmission may have been successful */
962 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
963 /* Collect data for each rate used during failed TX attempts */
964 for (i = 0; i <= retries; ++i) {
965 tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
966 il4965_rs_get_tbl_info_from_mcs(tx_rate, il->band,
967 &tbl_type, &rs_idx);
968 /*
969 * Only collect stats if retried rate is in the same RS
970 * table as active/search.
971 */
972 if (il4965_table_type_matches(&tbl_type, curr_tbl))
973 tmp_tbl = curr_tbl;
974 else if (il4965_table_type_matches
975 (&tbl_type, other_tbl))
976 tmp_tbl = other_tbl;
977 else
978 continue;
979 il4965_rs_collect_tx_data(tmp_tbl, rs_idx, 1,
980 i <
981 retries ? 0 : legacy_success);
982 }
983
984 /* Update success/fail counts if not searching for new mode */
985 if (lq_sta->stay_in_tbl) {
986 lq_sta->total_success += legacy_success;
987 lq_sta->total_failed += retries + (1 - legacy_success);
988 }
989 }
990 /* The last TX rate is cached in lq_sta; it's set in if/else above */
991 lq_sta->last_rate_n_flags = tx_rate;
992 done:
993 /* See if there's a better rate or modulation mode to try. */
994 if (sta->supp_rates[sband->band])
995 il4965_rs_rate_scale_perform(il, skb, sta, lq_sta);
996 }
997
998 /*
999 * Begin a period of staying with a selected modulation mode.
1000 * Set "stay_in_tbl" flag to prevent any mode switches.
1001 * Set frame tx success limits according to legacy vs. high-throughput,
1002 * and reset overall (spanning all rates) tx success history stats.
1003 * These control how long we stay using same modulation mode before
1004 * searching for a new mode.
1005 */
1006 static void
1007 il4965_rs_set_stay_in_table(struct il_priv *il, u8 is_legacy,
1008 struct il_lq_sta *lq_sta)
1009 {
1010 D_RATE("we are staying in the same table\n");
1011 lq_sta->stay_in_tbl = 1; /* only place this gets set */
1012 if (is_legacy) {
1013 lq_sta->table_count_limit = IL_LEGACY_TBL_COUNT;
1014 lq_sta->max_failure_limit = IL_LEGACY_FAILURE_LIMIT;
1015 lq_sta->max_success_limit = IL_LEGACY_SUCCESS_LIMIT;
1016 } else {
1017 lq_sta->table_count_limit = IL_NONE_LEGACY_TBL_COUNT;
1018 lq_sta->max_failure_limit = IL_NONE_LEGACY_FAILURE_LIMIT;
1019 lq_sta->max_success_limit = IL_NONE_LEGACY_SUCCESS_LIMIT;
1020 }
1021 lq_sta->table_count = 0;
1022 lq_sta->total_failed = 0;
1023 lq_sta->total_success = 0;
1024 lq_sta->flush_timer = jiffies;
1025 lq_sta->action_counter = 0;
1026 }
1027
1028 /*
1029 * Find correct throughput table for given mode of modulation
1030 */
1031 static void
1032 il4965_rs_set_expected_tpt_table(struct il_lq_sta *lq_sta,
1033 struct il_scale_tbl_info *tbl)
1034 {
1035 /* Used to choose among HT tables */
1036 s32(*ht_tbl_pointer)[RATE_COUNT];
1037
1038 /* Check for invalid LQ type */
1039 if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1040 tbl->expected_tpt = expected_tpt_legacy;
1041 return;
1042 }
1043
1044 /* Legacy rates have only one table */
1045 if (is_legacy(tbl->lq_type)) {
1046 tbl->expected_tpt = expected_tpt_legacy;
1047 return;
1048 }
1049
1050 /* Choose among many HT tables depending on number of streams
1051 * (SISO/MIMO2), channel width (20/40), SGI, and aggregation
1052 * status */
1053 if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1054 ht_tbl_pointer = expected_tpt_siso20MHz;
1055 else if (is_siso(tbl->lq_type))
1056 ht_tbl_pointer = expected_tpt_siso40MHz;
1057 else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1058 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1059 else /* if (is_mimo2(tbl->lq_type)) <-- must be true */
1060 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1061
1062 if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */
1063 tbl->expected_tpt = ht_tbl_pointer[0];
1064 else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */
1065 tbl->expected_tpt = ht_tbl_pointer[1];
1066 else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */
1067 tbl->expected_tpt = ht_tbl_pointer[2];
1068 else /* AGG+SGI */
1069 tbl->expected_tpt = ht_tbl_pointer[3];
1070 }
1071
1072 /*
1073 * Find starting rate for new "search" high-throughput mode of modulation.
1074 * Goal is to find lowest expected rate (under perfect conditions) that is
1075 * above the current measured throughput of "active" mode, to give new mode
1076 * a fair chance to prove itself without too many challenges.
1077 *
1078 * This gets called when transitioning to more aggressive modulation
1079 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1080 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1081 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1082 * bit rate will typically need to increase, but not if performance was bad.
1083 */
1084 static s32
1085 il4965_rs_get_best_rate(struct il_priv *il, struct il_lq_sta *lq_sta,
1086 struct il_scale_tbl_info *tbl, /* "search" */
1087 u16 rate_mask, s8 idx)
1088 {
1089 /* "active" values */
1090 struct il_scale_tbl_info *active_tbl =
1091 &(lq_sta->lq_info[lq_sta->active_tbl]);
1092 s32 active_sr = active_tbl->win[idx].success_ratio;
1093 s32 active_tpt = active_tbl->expected_tpt[idx];
1094
1095 /* expected "search" throughput */
1096 s32 *tpt_tbl = tbl->expected_tpt;
1097
1098 s32 new_rate, high, low, start_hi;
1099 u16 high_low;
1100 s8 rate = idx;
1101
1102 new_rate = high = low = start_hi = RATE_INVALID;
1103
1104 for (;;) {
1105 high_low =
1106 il4965_rs_get_adjacent_rate(il, rate, rate_mask,
1107 tbl->lq_type);
1108
1109 low = high_low & 0xff;
1110 high = (high_low >> 8) & 0xff;
1111
1112 /*
1113 * Lower the "search" bit rate, to give new "search" mode
1114 * approximately the same throughput as "active" if:
1115 *
1116 * 1) "Active" mode has been working modestly well (but not
1117 * great), and expected "search" throughput (under perfect
1118 * conditions) at candidate rate is above the actual
1119 * measured "active" throughput (but less than expected
1120 * "active" throughput under perfect conditions).
1121 * OR
1122 * 2) "Active" mode has been working perfectly or very well
1123 * and expected "search" throughput (under perfect
1124 * conditions) at candidate rate is above expected
1125 * "active" throughput (under perfect conditions).
1126 */
1127 if ((100 * tpt_tbl[rate] > lq_sta->last_tpt &&
1128 (active_sr > RATE_DECREASE_TH && active_sr <= RATE_HIGH_TH
1129 && tpt_tbl[rate] <= active_tpt)) ||
1130 (active_sr >= RATE_SCALE_SWITCH &&
1131 tpt_tbl[rate] > active_tpt)) {
1132
1133 /* (2nd or later pass)
1134 * If we've already tried to raise the rate, and are
1135 * now trying to lower it, use the higher rate. */
1136 if (start_hi != RATE_INVALID) {
1137 new_rate = start_hi;
1138 break;
1139 }
1140
1141 new_rate = rate;
1142
1143 /* Loop again with lower rate */
1144 if (low != RATE_INVALID)
1145 rate = low;
1146
1147 /* Lower rate not available, use the original */
1148 else
1149 break;
1150
1151 /* Else try to raise the "search" rate to match "active" */
1152 } else {
1153 /* (2nd or later pass)
1154 * If we've already tried to lower the rate, and are
1155 * now trying to raise it, use the lower rate. */
1156 if (new_rate != RATE_INVALID)
1157 break;
1158
1159 /* Loop again with higher rate */
1160 else if (high != RATE_INVALID) {
1161 start_hi = high;
1162 rate = high;
1163
1164 /* Higher rate not available, use the original */
1165 } else {
1166 new_rate = rate;
1167 break;
1168 }
1169 }
1170 }
1171
1172 return new_rate;
1173 }
1174
1175 /*
1176 * Set up search table for MIMO2
1177 */
1178 static int
1179 il4965_rs_switch_to_mimo2(struct il_priv *il, struct il_lq_sta *lq_sta,
1180 struct ieee80211_conf *conf,
1181 struct ieee80211_sta *sta,
1182 struct il_scale_tbl_info *tbl, int idx)
1183 {
1184 u16 rate_mask;
1185 s32 rate;
1186 s8 is_green = lq_sta->is_green;
1187 struct il_station_priv *sta_priv = (void *)sta->drv_priv;
1188 struct il_rxon_context *ctx = sta_priv->common.ctx;
1189
1190 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1191 return -1;
1192
1193 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2) ==
1194 WLAN_HT_CAP_SM_PS_STATIC)
1195 return -1;
1196
1197 /* Need both Tx chains/antennas to support MIMO */
1198 if (il->hw_params.tx_chains_num < 2)
1199 return -1;
1200
1201 D_RATE("LQ: try to switch to MIMO2\n");
1202
1203 tbl->lq_type = LQ_MIMO2;
1204 tbl->is_dup = lq_sta->is_dup;
1205 tbl->action = 0;
1206 tbl->max_search = IL_MAX_SEARCH;
1207 rate_mask = lq_sta->active_mimo2_rate;
1208
1209 if (il_is_ht40_tx_allowed(il, ctx, &sta->ht_cap))
1210 tbl->is_ht40 = 1;
1211 else
1212 tbl->is_ht40 = 0;
1213
1214 il4965_rs_set_expected_tpt_table(lq_sta, tbl);
1215
1216 rate = il4965_rs_get_best_rate(il, lq_sta, tbl, rate_mask, idx);
1217
1218 D_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1219 if (rate == RATE_INVALID || !((1 << rate) & rate_mask)) {
1220 D_RATE("Can't switch with idx %d rate mask %x\n", rate,
1221 rate_mask);
1222 return -1;
1223 }
1224 tbl->current_rate =
1225 il4965_rate_n_flags_from_tbl(il, tbl, rate, is_green);
1226
1227 D_RATE("LQ: Switch to new mcs %X idx is green %X\n", tbl->current_rate,
1228 is_green);
1229 return 0;
1230 }
1231
1232 /*
1233 * Set up search table for SISO
1234 */
1235 static int
1236 il4965_rs_switch_to_siso(struct il_priv *il, struct il_lq_sta *lq_sta,
1237 struct ieee80211_conf *conf, struct ieee80211_sta *sta,
1238 struct il_scale_tbl_info *tbl, int idx)
1239 {
1240 u16 rate_mask;
1241 u8 is_green = lq_sta->is_green;
1242 s32 rate;
1243 struct il_station_priv *sta_priv = (void *)sta->drv_priv;
1244 struct il_rxon_context *ctx = sta_priv->common.ctx;
1245
1246 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1247 return -1;
1248
1249 D_RATE("LQ: try to switch to SISO\n");
1250
1251 tbl->is_dup = lq_sta->is_dup;
1252 tbl->lq_type = LQ_SISO;
1253 tbl->action = 0;
1254 tbl->max_search = IL_MAX_SEARCH;
1255 rate_mask = lq_sta->active_siso_rate;
1256
1257 if (il_is_ht40_tx_allowed(il, ctx, &sta->ht_cap))
1258 tbl->is_ht40 = 1;
1259 else
1260 tbl->is_ht40 = 0;
1261
1262 if (is_green)
1263 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield */
1264
1265 il4965_rs_set_expected_tpt_table(lq_sta, tbl);
1266 rate = il4965_rs_get_best_rate(il, lq_sta, tbl, rate_mask, idx);
1267
1268 D_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask);
1269 if (rate == RATE_INVALID || !((1 << rate) & rate_mask)) {
1270 D_RATE("can not switch with idx %d rate mask %x\n", rate,
1271 rate_mask);
1272 return -1;
1273 }
1274 tbl->current_rate =
1275 il4965_rate_n_flags_from_tbl(il, tbl, rate, is_green);
1276 D_RATE("LQ: Switch to new mcs %X idx is green %X\n", tbl->current_rate,
1277 is_green);
1278 return 0;
1279 }
1280
1281 /*
1282 * Try to switch to new modulation mode from legacy
1283 */
1284 static int
1285 il4965_rs_move_legacy_other(struct il_priv *il, struct il_lq_sta *lq_sta,
1286 struct ieee80211_conf *conf,
1287 struct ieee80211_sta *sta, int idx)
1288 {
1289 struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1290 struct il_scale_tbl_info *search_tbl =
1291 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1292 struct il_rate_scale_data *win = &(tbl->win[idx]);
1293 u32 sz =
1294 (sizeof(struct il_scale_tbl_info) -
1295 (sizeof(struct il_rate_scale_data) * RATE_COUNT));
1296 u8 start_action;
1297 u8 valid_tx_ant = il->hw_params.valid_tx_ant;
1298 u8 tx_chains_num = il->hw_params.tx_chains_num;
1299 int ret = 0;
1300 u8 update_search_tbl_counter = 0;
1301
1302 tbl->action = IL_LEGACY_SWITCH_SISO;
1303
1304 start_action = tbl->action;
1305 for (;;) {
1306 lq_sta->action_counter++;
1307 switch (tbl->action) {
1308 case IL_LEGACY_SWITCH_ANTENNA1:
1309 case IL_LEGACY_SWITCH_ANTENNA2:
1310 D_RATE("LQ: Legacy toggle Antenna\n");
1311
1312 if ((tbl->action == IL_LEGACY_SWITCH_ANTENNA1 &&
1313 tx_chains_num <= 1) ||
1314 (tbl->action == IL_LEGACY_SWITCH_ANTENNA2 &&
1315 tx_chains_num <= 2))
1316 break;
1317
1318 /* Don't change antenna if success has been great */
1319 if (win->success_ratio >= IL_RS_GOOD_RATIO)
1320 break;
1321
1322 /* Set up search table to try other antenna */
1323 memcpy(search_tbl, tbl, sz);
1324
1325 if (il4965_rs_toggle_antenna
1326 (valid_tx_ant, &search_tbl->current_rate,
1327 search_tbl)) {
1328 update_search_tbl_counter = 1;
1329 il4965_rs_set_expected_tpt_table(lq_sta,
1330 search_tbl);
1331 goto out;
1332 }
1333 break;
1334 case IL_LEGACY_SWITCH_SISO:
1335 D_RATE("LQ: Legacy switch to SISO\n");
1336
1337 /* Set up search table to try SISO */
1338 memcpy(search_tbl, tbl, sz);
1339 search_tbl->is_SGI = 0;
1340 ret =
1341 il4965_rs_switch_to_siso(il, lq_sta, conf, sta,
1342 search_tbl, idx);
1343 if (!ret) {
1344 lq_sta->action_counter = 0;
1345 goto out;
1346 }
1347
1348 break;
1349 case IL_LEGACY_SWITCH_MIMO2_AB:
1350 case IL_LEGACY_SWITCH_MIMO2_AC:
1351 case IL_LEGACY_SWITCH_MIMO2_BC:
1352 D_RATE("LQ: Legacy switch to MIMO2\n");
1353
1354 /* Set up search table to try MIMO */
1355 memcpy(search_tbl, tbl, sz);
1356 search_tbl->is_SGI = 0;
1357
1358 if (tbl->action == IL_LEGACY_SWITCH_MIMO2_AB)
1359 search_tbl->ant_type = ANT_AB;
1360 else if (tbl->action == IL_LEGACY_SWITCH_MIMO2_AC)
1361 search_tbl->ant_type = ANT_AC;
1362 else
1363 search_tbl->ant_type = ANT_BC;
1364
1365 if (!il4965_rs_is_valid_ant
1366 (valid_tx_ant, search_tbl->ant_type))
1367 break;
1368
1369 ret =
1370 il4965_rs_switch_to_mimo2(il, lq_sta, conf, sta,
1371 search_tbl, idx);
1372 if (!ret) {
1373 lq_sta->action_counter = 0;
1374 goto out;
1375 }
1376 break;
1377 }
1378 tbl->action++;
1379 if (tbl->action > IL_LEGACY_SWITCH_MIMO2_BC)
1380 tbl->action = IL_LEGACY_SWITCH_ANTENNA1;
1381
1382 if (tbl->action == start_action)
1383 break;
1384
1385 }
1386 search_tbl->lq_type = LQ_NONE;
1387 return 0;
1388
1389 out:
1390 lq_sta->search_better_tbl = 1;
1391 tbl->action++;
1392 if (tbl->action > IL_LEGACY_SWITCH_MIMO2_BC)
1393 tbl->action = IL_LEGACY_SWITCH_ANTENNA1;
1394 if (update_search_tbl_counter)
1395 search_tbl->action = tbl->action;
1396 return 0;
1397
1398 }
1399
1400 /*
1401 * Try to switch to new modulation mode from SISO
1402 */
1403 static int
1404 il4965_rs_move_siso_to_other(struct il_priv *il, struct il_lq_sta *lq_sta,
1405 struct ieee80211_conf *conf,
1406 struct ieee80211_sta *sta, int idx)
1407 {
1408 u8 is_green = lq_sta->is_green;
1409 struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1410 struct il_scale_tbl_info *search_tbl =
1411 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1412 struct il_rate_scale_data *win = &(tbl->win[idx]);
1413 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1414 u32 sz =
1415 (sizeof(struct il_scale_tbl_info) -
1416 (sizeof(struct il_rate_scale_data) * RATE_COUNT));
1417 u8 start_action;
1418 u8 valid_tx_ant = il->hw_params.valid_tx_ant;
1419 u8 tx_chains_num = il->hw_params.tx_chains_num;
1420 u8 update_search_tbl_counter = 0;
1421 int ret;
1422
1423 start_action = tbl->action;
1424
1425 for (;;) {
1426 lq_sta->action_counter++;
1427 switch (tbl->action) {
1428 case IL_SISO_SWITCH_ANTENNA1:
1429 case IL_SISO_SWITCH_ANTENNA2:
1430 D_RATE("LQ: SISO toggle Antenna\n");
1431 if ((tbl->action == IL_SISO_SWITCH_ANTENNA1 &&
1432 tx_chains_num <= 1) ||
1433 (tbl->action == IL_SISO_SWITCH_ANTENNA2 &&
1434 tx_chains_num <= 2))
1435 break;
1436
1437 if (win->success_ratio >= IL_RS_GOOD_RATIO)
1438 break;
1439
1440 memcpy(search_tbl, tbl, sz);
1441 if (il4965_rs_toggle_antenna
1442 (valid_tx_ant, &search_tbl->current_rate,
1443 search_tbl)) {
1444 update_search_tbl_counter = 1;
1445 goto out;
1446 }
1447 break;
1448 case IL_SISO_SWITCH_MIMO2_AB:
1449 case IL_SISO_SWITCH_MIMO2_AC:
1450 case IL_SISO_SWITCH_MIMO2_BC:
1451 D_RATE("LQ: SISO switch to MIMO2\n");
1452 memcpy(search_tbl, tbl, sz);
1453 search_tbl->is_SGI = 0;
1454
1455 if (tbl->action == IL_SISO_SWITCH_MIMO2_AB)
1456 search_tbl->ant_type = ANT_AB;
1457 else if (tbl->action == IL_SISO_SWITCH_MIMO2_AC)
1458 search_tbl->ant_type = ANT_AC;
1459 else
1460 search_tbl->ant_type = ANT_BC;
1461
1462 if (!il4965_rs_is_valid_ant
1463 (valid_tx_ant, search_tbl->ant_type))
1464 break;
1465
1466 ret =
1467 il4965_rs_switch_to_mimo2(il, lq_sta, conf, sta,
1468 search_tbl, idx);
1469 if (!ret)
1470 goto out;
1471 break;
1472 case IL_SISO_SWITCH_GI:
1473 if (!tbl->is_ht40 &&
1474 !(ht_cap->cap & IEEE80211_HT_CAP_SGI_20))
1475 break;
1476 if (tbl->is_ht40 &&
1477 !(ht_cap->cap & IEEE80211_HT_CAP_SGI_40))
1478 break;
1479
1480 D_RATE("LQ: SISO toggle SGI/NGI\n");
1481
1482 memcpy(search_tbl, tbl, sz);
1483 if (is_green) {
1484 if (!tbl->is_SGI)
1485 break;
1486 else
1487 IL_ERR("SGI was set in GF+SISO\n");
1488 }
1489 search_tbl->is_SGI = !tbl->is_SGI;
1490 il4965_rs_set_expected_tpt_table(lq_sta, search_tbl);
1491 if (tbl->is_SGI) {
1492 s32 tpt = lq_sta->last_tpt / 100;
1493 if (tpt >= search_tbl->expected_tpt[idx])
1494 break;
1495 }
1496 search_tbl->current_rate =
1497 il4965_rate_n_flags_from_tbl(il, search_tbl, idx,
1498 is_green);
1499 update_search_tbl_counter = 1;
1500 goto out;
1501 }
1502 tbl->action++;
1503 if (tbl->action > IL_SISO_SWITCH_GI)
1504 tbl->action = IL_SISO_SWITCH_ANTENNA1;
1505
1506 if (tbl->action == start_action)
1507 break;
1508 }
1509 search_tbl->lq_type = LQ_NONE;
1510 return 0;
1511
1512 out:
1513 lq_sta->search_better_tbl = 1;
1514 tbl->action++;
1515 if (tbl->action > IL_SISO_SWITCH_GI)
1516 tbl->action = IL_SISO_SWITCH_ANTENNA1;
1517 if (update_search_tbl_counter)
1518 search_tbl->action = tbl->action;
1519
1520 return 0;
1521 }
1522
1523 /*
1524 * Try to switch to new modulation mode from MIMO2
1525 */
1526 static int
1527 il4965_rs_move_mimo2_to_other(struct il_priv *il, struct il_lq_sta *lq_sta,
1528 struct ieee80211_conf *conf,
1529 struct ieee80211_sta *sta, int idx)
1530 {
1531 s8 is_green = lq_sta->is_green;
1532 struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1533 struct il_scale_tbl_info *search_tbl =
1534 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1535 struct il_rate_scale_data *win = &(tbl->win[idx]);
1536 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1537 u32 sz =
1538 (sizeof(struct il_scale_tbl_info) -
1539 (sizeof(struct il_rate_scale_data) * RATE_COUNT));
1540 u8 start_action;
1541 u8 valid_tx_ant = il->hw_params.valid_tx_ant;
1542 u8 tx_chains_num = il->hw_params.tx_chains_num;
1543 u8 update_search_tbl_counter = 0;
1544 int ret;
1545
1546 start_action = tbl->action;
1547 for (;;) {
1548 lq_sta->action_counter++;
1549 switch (tbl->action) {
1550 case IL_MIMO2_SWITCH_ANTENNA1:
1551 case IL_MIMO2_SWITCH_ANTENNA2:
1552 D_RATE("LQ: MIMO2 toggle Antennas\n");
1553
1554 if (tx_chains_num <= 2)
1555 break;
1556
1557 if (win->success_ratio >= IL_RS_GOOD_RATIO)
1558 break;
1559
1560 memcpy(search_tbl, tbl, sz);
1561 if (il4965_rs_toggle_antenna
1562 (valid_tx_ant, &search_tbl->current_rate,
1563 search_tbl)) {
1564 update_search_tbl_counter = 1;
1565 goto out;
1566 }
1567 break;
1568 case IL_MIMO2_SWITCH_SISO_A:
1569 case IL_MIMO2_SWITCH_SISO_B:
1570 case IL_MIMO2_SWITCH_SISO_C:
1571 D_RATE("LQ: MIMO2 switch to SISO\n");
1572
1573 /* Set up new search table for SISO */
1574 memcpy(search_tbl, tbl, sz);
1575
1576 if (tbl->action == IL_MIMO2_SWITCH_SISO_A)
1577 search_tbl->ant_type = ANT_A;
1578 else if (tbl->action == IL_MIMO2_SWITCH_SISO_B)
1579 search_tbl->ant_type = ANT_B;
1580 else
1581 search_tbl->ant_type = ANT_C;
1582
1583 if (!il4965_rs_is_valid_ant
1584 (valid_tx_ant, search_tbl->ant_type))
1585 break;
1586
1587 ret =
1588 il4965_rs_switch_to_siso(il, lq_sta, conf, sta,
1589 search_tbl, idx);
1590 if (!ret)
1591 goto out;
1592
1593 break;
1594
1595 case IL_MIMO2_SWITCH_GI:
1596 if (!tbl->is_ht40 &&
1597 !(ht_cap->cap & IEEE80211_HT_CAP_SGI_20))
1598 break;
1599 if (tbl->is_ht40 &&
1600 !(ht_cap->cap & IEEE80211_HT_CAP_SGI_40))
1601 break;
1602
1603 D_RATE("LQ: MIMO2 toggle SGI/NGI\n");
1604
1605 /* Set up new search table for MIMO2 */
1606 memcpy(search_tbl, tbl, sz);
1607 search_tbl->is_SGI = !tbl->is_SGI;
1608 il4965_rs_set_expected_tpt_table(lq_sta, search_tbl);
1609 /*
1610 * If active table already uses the fastest possible
1611 * modulation (dual stream with short guard interval),
1612 * and it's working well, there's no need to look
1613 * for a better type of modulation!
1614 */
1615 if (tbl->is_SGI) {
1616 s32 tpt = lq_sta->last_tpt / 100;
1617 if (tpt >= search_tbl->expected_tpt[idx])
1618 break;
1619 }
1620 search_tbl->current_rate =
1621 il4965_rate_n_flags_from_tbl(il, search_tbl, idx,
1622 is_green);
1623 update_search_tbl_counter = 1;
1624 goto out;
1625
1626 }
1627 tbl->action++;
1628 if (tbl->action > IL_MIMO2_SWITCH_GI)
1629 tbl->action = IL_MIMO2_SWITCH_ANTENNA1;
1630
1631 if (tbl->action == start_action)
1632 break;
1633 }
1634 search_tbl->lq_type = LQ_NONE;
1635 return 0;
1636 out:
1637 lq_sta->search_better_tbl = 1;
1638 tbl->action++;
1639 if (tbl->action > IL_MIMO2_SWITCH_GI)
1640 tbl->action = IL_MIMO2_SWITCH_ANTENNA1;
1641 if (update_search_tbl_counter)
1642 search_tbl->action = tbl->action;
1643
1644 return 0;
1645
1646 }
1647
1648 /*
1649 * Check whether we should continue using same modulation mode, or
1650 * begin search for a new mode, based on:
1651 * 1) # tx successes or failures while using this mode
1652 * 2) # times calling this function
1653 * 3) elapsed time in this mode (not used, for now)
1654 */
1655 static void
1656 il4965_rs_stay_in_table(struct il_lq_sta *lq_sta, bool force_search)
1657 {
1658 struct il_scale_tbl_info *tbl;
1659 int i;
1660 int active_tbl;
1661 int flush_interval_passed = 0;
1662 struct il_priv *il;
1663
1664 il = lq_sta->drv;
1665 active_tbl = lq_sta->active_tbl;
1666
1667 tbl = &(lq_sta->lq_info[active_tbl]);
1668
1669 /* If we've been disallowing search, see if we should now allow it */
1670 if (lq_sta->stay_in_tbl) {
1671
1672 /* Elapsed time using current modulation mode */
1673 if (lq_sta->flush_timer)
1674 flush_interval_passed =
1675 time_after(jiffies,
1676 (unsigned long)(lq_sta->flush_timer +
1677 RATE_SCALE_FLUSH_INTVL));
1678
1679 /*
1680 * Check if we should allow search for new modulation mode.
1681 * If many frames have failed or succeeded, or we've used
1682 * this same modulation for a long time, allow search, and
1683 * reset history stats that keep track of whether we should
1684 * allow a new search. Also (below) reset all bitmaps and
1685 * stats in active history.
1686 */
1687 if (force_search ||
1688 lq_sta->total_failed > lq_sta->max_failure_limit ||
1689 lq_sta->total_success > lq_sta->max_success_limit ||
1690 (!lq_sta->search_better_tbl && lq_sta->flush_timer &&
1691 flush_interval_passed)) {
1692 D_RATE("LQ: stay is expired %d %d %d\n:",
1693 lq_sta->total_failed, lq_sta->total_success,
1694 flush_interval_passed);
1695
1696 /* Allow search for new mode */
1697 lq_sta->stay_in_tbl = 0; /* only place reset */
1698 lq_sta->total_failed = 0;
1699 lq_sta->total_success = 0;
1700 lq_sta->flush_timer = 0;
1701
1702 /*
1703 * Else if we've used this modulation mode enough repetitions
1704 * (regardless of elapsed time or success/failure), reset
1705 * history bitmaps and rate-specific stats for all rates in
1706 * active table.
1707 */
1708 } else {
1709 lq_sta->table_count++;
1710 if (lq_sta->table_count >= lq_sta->table_count_limit) {
1711 lq_sta->table_count = 0;
1712
1713 D_RATE("LQ: stay in table clear win\n");
1714 for (i = 0; i < RATE_COUNT; i++)
1715 il4965_rs_rate_scale_clear_win(&
1716 (tbl->
1717 win
1718 [i]));
1719 }
1720 }
1721
1722 /* If transitioning to allow "search", reset all history
1723 * bitmaps and stats in active table (this will become the new
1724 * "search" table). */
1725 if (!lq_sta->stay_in_tbl) {
1726 for (i = 0; i < RATE_COUNT; i++)
1727 il4965_rs_rate_scale_clear_win(&(tbl->win[i]));
1728 }
1729 }
1730 }
1731
1732 /*
1733 * setup rate table in uCode
1734 */
1735 static void
1736 il4965_rs_update_rate_tbl(struct il_priv *il, struct il_rxon_context *ctx,
1737 struct il_lq_sta *lq_sta,
1738 struct il_scale_tbl_info *tbl, int idx, u8 is_green)
1739 {
1740 u32 rate;
1741
1742 /* Update uCode's rate table. */
1743 rate = il4965_rate_n_flags_from_tbl(il, tbl, idx, is_green);
1744 il4965_rs_fill_link_cmd(il, lq_sta, rate);
1745 il_send_lq_cmd(il, ctx, &lq_sta->lq, CMD_ASYNC, false);
1746 }
1747
1748 /*
1749 * Do rate scaling and search for new modulation mode.
1750 */
1751 static void
1752 il4965_rs_rate_scale_perform(struct il_priv *il, struct sk_buff *skb,
1753 struct ieee80211_sta *sta,
1754 struct il_lq_sta *lq_sta)
1755 {
1756 struct ieee80211_hw *hw = il->hw;
1757 struct ieee80211_conf *conf = &hw->conf;
1758 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1759 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1760 int low = RATE_INVALID;
1761 int high = RATE_INVALID;
1762 int idx;
1763 int i;
1764 struct il_rate_scale_data *win = NULL;
1765 int current_tpt = IL_INVALID_VALUE;
1766 int low_tpt = IL_INVALID_VALUE;
1767 int high_tpt = IL_INVALID_VALUE;
1768 u32 fail_count;
1769 s8 scale_action = 0;
1770 u16 rate_mask;
1771 u8 update_lq = 0;
1772 struct il_scale_tbl_info *tbl, *tbl1;
1773 u16 rate_scale_idx_msk = 0;
1774 u8 is_green = 0;
1775 u8 active_tbl = 0;
1776 u8 done_search = 0;
1777 u16 high_low;
1778 s32 sr;
1779 u8 tid = MAX_TID_COUNT;
1780 struct il_tid_data *tid_data;
1781 struct il_station_priv *sta_priv = (void *)sta->drv_priv;
1782 struct il_rxon_context *ctx = sta_priv->common.ctx;
1783
1784 D_RATE("rate scale calculate new rate for skb\n");
1785
1786 /* Send management frames and NO_ACK data using lowest rate. */
1787 /* TODO: this could probably be improved.. */
1788 if (!ieee80211_is_data(hdr->frame_control) ||
1789 (info->flags & IEEE80211_TX_CTL_NO_ACK))
1790 return;
1791
1792 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
1793
1794 tid = il4965_rs_tl_add_packet(lq_sta, hdr);
1795 if (tid != MAX_TID_COUNT && (lq_sta->tx_agg_tid_en & (1 << tid))) {
1796 tid_data = &il->stations[lq_sta->lq.sta_id].tid[tid];
1797 if (tid_data->agg.state == IL_AGG_OFF)
1798 lq_sta->is_agg = 0;
1799 else
1800 lq_sta->is_agg = 1;
1801 } else
1802 lq_sta->is_agg = 0;
1803
1804 /*
1805 * Select rate-scale / modulation-mode table to work with in
1806 * the rest of this function: "search" if searching for better
1807 * modulation mode, or "active" if doing rate scaling within a mode.
1808 */
1809 if (!lq_sta->search_better_tbl)
1810 active_tbl = lq_sta->active_tbl;
1811 else
1812 active_tbl = 1 - lq_sta->active_tbl;
1813
1814 tbl = &(lq_sta->lq_info[active_tbl]);
1815 if (is_legacy(tbl->lq_type))
1816 lq_sta->is_green = 0;
1817 else
1818 lq_sta->is_green = il4965_rs_use_green(sta);
1819 is_green = lq_sta->is_green;
1820
1821 /* current tx rate */
1822 idx = lq_sta->last_txrate_idx;
1823
1824 D_RATE("Rate scale idx %d for type %d\n", idx, tbl->lq_type);
1825
1826 /* rates available for this association, and for modulation mode */
1827 rate_mask = il4965_rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
1828
1829 D_RATE("mask 0x%04X\n", rate_mask);
1830
1831 /* mask with station rate restriction */
1832 if (is_legacy(tbl->lq_type)) {
1833 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1834 /* supp_rates has no CCK bits in A mode */
1835 rate_scale_idx_msk =
1836 (u16) (rate_mask &
1837 (lq_sta->supp_rates << IL_FIRST_OFDM_RATE));
1838 else
1839 rate_scale_idx_msk =
1840 (u16) (rate_mask & lq_sta->supp_rates);
1841
1842 } else
1843 rate_scale_idx_msk = rate_mask;
1844
1845 if (!rate_scale_idx_msk)
1846 rate_scale_idx_msk = rate_mask;
1847
1848 if (!((1 << idx) & rate_scale_idx_msk)) {
1849 IL_ERR("Current Rate is not valid\n");
1850 if (lq_sta->search_better_tbl) {
1851 /* revert to active table if search table is not valid */
1852 tbl->lq_type = LQ_NONE;
1853 lq_sta->search_better_tbl = 0;
1854 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1855 /* get "active" rate info */
1856 idx = il4965_hwrate_to_plcp_idx(tbl->current_rate);
1857 il4965_rs_update_rate_tbl(il, ctx, lq_sta, tbl, idx,
1858 is_green);
1859 }
1860 return;
1861 }
1862
1863 /* Get expected throughput table and history win for current rate */
1864 if (!tbl->expected_tpt) {
1865 IL_ERR("tbl->expected_tpt is NULL\n");
1866 return;
1867 }
1868
1869 /* force user max rate if set by user */
1870 if (lq_sta->max_rate_idx != -1 && lq_sta->max_rate_idx < idx) {
1871 idx = lq_sta->max_rate_idx;
1872 update_lq = 1;
1873 win = &(tbl->win[idx]);
1874 goto lq_update;
1875 }
1876
1877 win = &(tbl->win[idx]);
1878
1879 /*
1880 * If there is not enough history to calculate actual average
1881 * throughput, keep analyzing results of more tx frames, without
1882 * changing rate or mode (bypass most of the rest of this function).
1883 * Set up new rate table in uCode only if old rate is not supported
1884 * in current association (use new rate found above).
1885 */
1886 fail_count = win->counter - win->success_counter;
1887 if (fail_count < RATE_MIN_FAILURE_TH &&
1888 win->success_counter < RATE_MIN_SUCCESS_TH) {
1889 D_RATE("LQ: still below TH. succ=%d total=%d " "for idx %d\n",
1890 win->success_counter, win->counter, idx);
1891
1892 /* Can't calculate this yet; not enough history */
1893 win->average_tpt = IL_INVALID_VALUE;
1894
1895 /* Should we stay with this modulation mode,
1896 * or search for a new one? */
1897 il4965_rs_stay_in_table(lq_sta, false);
1898
1899 goto out;
1900 }
1901 /* Else we have enough samples; calculate estimate of
1902 * actual average throughput */
1903 if (win->average_tpt !=
1904 ((win->success_ratio * tbl->expected_tpt[idx] + 64) / 128)) {
1905 IL_ERR("expected_tpt should have been calculated by now\n");
1906 win->average_tpt =
1907 ((win->success_ratio * tbl->expected_tpt[idx] + 64) / 128);
1908 }
1909
1910 /* If we are searching for better modulation mode, check success. */
1911 if (lq_sta->search_better_tbl) {
1912 /* If good success, continue using the "search" mode;
1913 * no need to send new link quality command, since we're
1914 * continuing to use the setup that we've been trying. */
1915 if (win->average_tpt > lq_sta->last_tpt) {
1916
1917 D_RATE("LQ: SWITCHING TO NEW TBL "
1918 "suc=%d cur-tpt=%d old-tpt=%d\n",
1919 win->success_ratio, win->average_tpt,
1920 lq_sta->last_tpt);
1921
1922 if (!is_legacy(tbl->lq_type))
1923 lq_sta->enable_counter = 1;
1924
1925 /* Swap tables; "search" becomes "active" */
1926 lq_sta->active_tbl = active_tbl;
1927 current_tpt = win->average_tpt;
1928
1929 /* Else poor success; go back to mode in "active" table */
1930 } else {
1931
1932 D_RATE("LQ: GOING BACK TO THE OLD TBL "
1933 "suc=%d cur-tpt=%d old-tpt=%d\n",
1934 win->success_ratio, win->average_tpt,
1935 lq_sta->last_tpt);
1936
1937 /* Nullify "search" table */
1938 tbl->lq_type = LQ_NONE;
1939
1940 /* Revert to "active" table */
1941 active_tbl = lq_sta->active_tbl;
1942 tbl = &(lq_sta->lq_info[active_tbl]);
1943
1944 /* Revert to "active" rate and throughput info */
1945 idx = il4965_hwrate_to_plcp_idx(tbl->current_rate);
1946 current_tpt = lq_sta->last_tpt;
1947
1948 /* Need to set up a new rate table in uCode */
1949 update_lq = 1;
1950 }
1951
1952 /* Either way, we've made a decision; modulation mode
1953 * search is done, allow rate adjustment next time. */
1954 lq_sta->search_better_tbl = 0;
1955 done_search = 1; /* Don't switch modes below! */
1956 goto lq_update;
1957 }
1958
1959 /* (Else) not in search of better modulation mode, try for better
1960 * starting rate, while staying in this mode. */
1961 high_low =
1962 il4965_rs_get_adjacent_rate(il, idx, rate_scale_idx_msk,
1963 tbl->lq_type);
1964 low = high_low & 0xff;
1965 high = (high_low >> 8) & 0xff;
1966
1967 /* If user set max rate, dont allow higher than user constrain */
1968 if (lq_sta->max_rate_idx != -1 && lq_sta->max_rate_idx < high)
1969 high = RATE_INVALID;
1970
1971 sr = win->success_ratio;
1972
1973 /* Collect measured throughputs for current and adjacent rates */
1974 current_tpt = win->average_tpt;
1975 if (low != RATE_INVALID)
1976 low_tpt = tbl->win[low].average_tpt;
1977 if (high != RATE_INVALID)
1978 high_tpt = tbl->win[high].average_tpt;
1979
1980 scale_action = 0;
1981
1982 /* Too many failures, decrease rate */
1983 if (sr <= RATE_DECREASE_TH || current_tpt == 0) {
1984 D_RATE("decrease rate because of low success_ratio\n");
1985 scale_action = -1;
1986
1987 /* No throughput measured yet for adjacent rates; try increase. */
1988 } else if (low_tpt == IL_INVALID_VALUE && high_tpt == IL_INVALID_VALUE) {
1989
1990 if (high != RATE_INVALID && sr >= RATE_INCREASE_TH)
1991 scale_action = 1;
1992 else if (low != RATE_INVALID)
1993 scale_action = 0;
1994 }
1995
1996 /* Both adjacent throughputs are measured, but neither one has better
1997 * throughput; we're using the best rate, don't change it! */
1998 else if (low_tpt != IL_INVALID_VALUE && high_tpt != IL_INVALID_VALUE &&
1999 low_tpt < current_tpt && high_tpt < current_tpt)
2000 scale_action = 0;
2001
2002 /* At least one adjacent rate's throughput is measured,
2003 * and may have better performance. */
2004 else {
2005 /* Higher adjacent rate's throughput is measured */
2006 if (high_tpt != IL_INVALID_VALUE) {
2007 /* Higher rate has better throughput */
2008 if (high_tpt > current_tpt && sr >= RATE_INCREASE_TH)
2009 scale_action = 1;
2010 else
2011 scale_action = 0;
2012
2013 /* Lower adjacent rate's throughput is measured */
2014 } else if (low_tpt != IL_INVALID_VALUE) {
2015 /* Lower rate has better throughput */
2016 if (low_tpt > current_tpt) {
2017 D_RATE("decrease rate because of low tpt\n");
2018 scale_action = -1;
2019 } else if (sr >= RATE_INCREASE_TH) {
2020 scale_action = 1;
2021 }
2022 }
2023 }
2024
2025 /* Sanity check; asked for decrease, but success rate or throughput
2026 * has been good at old rate. Don't change it. */
2027 if (scale_action == -1 && low != RATE_INVALID &&
2028 (sr > RATE_HIGH_TH || current_tpt > 100 * tbl->expected_tpt[low]))
2029 scale_action = 0;
2030
2031 switch (scale_action) {
2032 case -1:
2033 /* Decrease starting rate, update uCode's rate table */
2034 if (low != RATE_INVALID) {
2035 update_lq = 1;
2036 idx = low;
2037 }
2038
2039 break;
2040 case 1:
2041 /* Increase starting rate, update uCode's rate table */
2042 if (high != RATE_INVALID) {
2043 update_lq = 1;
2044 idx = high;
2045 }
2046
2047 break;
2048 case 0:
2049 /* No change */
2050 default:
2051 break;
2052 }
2053
2054 D_RATE("choose rate scale idx %d action %d low %d " "high %d type %d\n",
2055 idx, scale_action, low, high, tbl->lq_type);
2056
2057 lq_update:
2058 /* Replace uCode's rate table for the destination station. */
2059 if (update_lq)
2060 il4965_rs_update_rate_tbl(il, ctx, lq_sta, tbl, idx,
2061 is_green);
2062
2063 /* Should we stay with this modulation mode,
2064 * or search for a new one? */
2065 il4965_rs_stay_in_table(lq_sta, false);
2066
2067 /*
2068 * Search for new modulation mode if we're:
2069 * 1) Not changing rates right now
2070 * 2) Not just finishing up a search
2071 * 3) Allowing a new search
2072 */
2073 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && win->counter) {
2074 /* Save current throughput to compare with "search" throughput */
2075 lq_sta->last_tpt = current_tpt;
2076
2077 /* Select a new "search" modulation mode to try.
2078 * If one is found, set up the new "search" table. */
2079 if (is_legacy(tbl->lq_type))
2080 il4965_rs_move_legacy_other(il, lq_sta, conf, sta, idx);
2081 else if (is_siso(tbl->lq_type))
2082 il4965_rs_move_siso_to_other(il, lq_sta, conf, sta,
2083 idx);
2084 else /* (is_mimo2(tbl->lq_type)) */
2085 il4965_rs_move_mimo2_to_other(il, lq_sta, conf, sta,
2086 idx);
2087
2088 /* If new "search" mode was selected, set up in uCode table */
2089 if (lq_sta->search_better_tbl) {
2090 /* Access the "search" table, clear its history. */
2091 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2092 for (i = 0; i < RATE_COUNT; i++)
2093 il4965_rs_rate_scale_clear_win(&(tbl->win[i]));
2094
2095 /* Use new "search" start rate */
2096 idx = il4965_hwrate_to_plcp_idx(tbl->current_rate);
2097
2098 D_RATE("Switch current mcs: %X idx: %d\n",
2099 tbl->current_rate, idx);
2100 il4965_rs_fill_link_cmd(il, lq_sta, tbl->current_rate);
2101 il_send_lq_cmd(il, ctx, &lq_sta->lq, CMD_ASYNC, false);
2102 } else
2103 done_search = 1;
2104 }
2105
2106 if (done_search && !lq_sta->stay_in_tbl) {
2107 /* If the "active" (non-search) mode was legacy,
2108 * and we've tried switching antennas,
2109 * but we haven't been able to try HT modes (not available),
2110 * stay with best antenna legacy modulation for a while
2111 * before next round of mode comparisons. */
2112 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2113 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2114 lq_sta->action_counter > tbl1->max_search) {
2115 D_RATE("LQ: STAY in legacy table\n");
2116 il4965_rs_set_stay_in_table(il, 1, lq_sta);
2117 }
2118
2119 /* If we're in an HT mode, and all 3 mode switch actions
2120 * have been tried and compared, stay in this best modulation
2121 * mode for a while before next round of mode comparisons. */
2122 if (lq_sta->enable_counter &&
2123 lq_sta->action_counter >= tbl1->max_search) {
2124 if (lq_sta->last_tpt > IL_AGG_TPT_THREHOLD &&
2125 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2126 tid != MAX_TID_COUNT) {
2127 tid_data =
2128 &il->stations[lq_sta->lq.sta_id].tid[tid];
2129 if (tid_data->agg.state == IL_AGG_OFF) {
2130 D_RATE("try to aggregate tid %d\n",
2131 tid);
2132 il4965_rs_tl_turn_on_agg(il, tid,
2133 lq_sta, sta);
2134 }
2135 }
2136 il4965_rs_set_stay_in_table(il, 0, lq_sta);
2137 }
2138 }
2139
2140 out:
2141 tbl->current_rate =
2142 il4965_rate_n_flags_from_tbl(il, tbl, idx, is_green);
2143 i = idx;
2144 lq_sta->last_txrate_idx = i;
2145 }
2146
2147 /**
2148 * il4965_rs_initialize_lq - Initialize a station's hardware rate table
2149 *
2150 * The uCode's station table contains a table of fallback rates
2151 * for automatic fallback during transmission.
2152 *
2153 * NOTE: This sets up a default set of values. These will be replaced later
2154 * if the driver's iwl-4965-rs rate scaling algorithm is used, instead of
2155 * rc80211_simple.
2156 *
2157 * NOTE: Run C_ADD_STA command to set up station table entry, before
2158 * calling this function (which runs C_TX_LINK_QUALITY_CMD,
2159 * which requires station table entry to exist).
2160 */
2161 static void
2162 il4965_rs_initialize_lq(struct il_priv *il, struct ieee80211_conf *conf,
2163 struct ieee80211_sta *sta, struct il_lq_sta *lq_sta)
2164 {
2165 struct il_scale_tbl_info *tbl;
2166 int rate_idx;
2167 int i;
2168 u32 rate;
2169 u8 use_green = il4965_rs_use_green(sta);
2170 u8 active_tbl = 0;
2171 u8 valid_tx_ant;
2172 struct il_station_priv *sta_priv;
2173 struct il_rxon_context *ctx;
2174
2175 if (!sta || !lq_sta)
2176 return;
2177
2178 sta_priv = (void *)sta->drv_priv;
2179 ctx = sta_priv->common.ctx;
2180
2181 i = lq_sta->last_txrate_idx;
2182
2183 valid_tx_ant = il->hw_params.valid_tx_ant;
2184
2185 if (!lq_sta->search_better_tbl)
2186 active_tbl = lq_sta->active_tbl;
2187 else
2188 active_tbl = 1 - lq_sta->active_tbl;
2189
2190 tbl = &(lq_sta->lq_info[active_tbl]);
2191
2192 if (i < 0 || i >= RATE_COUNT)
2193 i = 0;
2194
2195 rate = il_rates[i].plcp;
2196 tbl->ant_type = il4965_first_antenna(valid_tx_ant);
2197 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2198
2199 if (i >= IL_FIRST_CCK_RATE && i <= IL_LAST_CCK_RATE)
2200 rate |= RATE_MCS_CCK_MSK;
2201
2202 il4965_rs_get_tbl_info_from_mcs(rate, il->band, tbl, &rate_idx);
2203 if (!il4965_rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2204 il4965_rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2205
2206 rate = il4965_rate_n_flags_from_tbl(il, tbl, rate_idx, use_green);
2207 tbl->current_rate = rate;
2208 il4965_rs_set_expected_tpt_table(lq_sta, tbl);
2209 il4965_rs_fill_link_cmd(NULL, lq_sta, rate);
2210 il->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2211 il_send_lq_cmd(il, ctx, &lq_sta->lq, CMD_SYNC, true);
2212 }
2213
2214 static void
2215 il4965_rs_get_rate(void *il_r, struct ieee80211_sta *sta, void *il_sta,
2216 struct ieee80211_tx_rate_control *txrc)
2217 {
2218
2219 struct sk_buff *skb = txrc->skb;
2220 struct ieee80211_supported_band *sband = txrc->sband;
2221 struct il_priv *il __maybe_unused = (struct il_priv *)il_r;
2222 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2223 struct il_lq_sta *lq_sta = il_sta;
2224 int rate_idx;
2225
2226 D_RATE("rate scale calculate new rate for skb\n");
2227
2228 /* Get max rate if user set max rate */
2229 if (lq_sta) {
2230 lq_sta->max_rate_idx = txrc->max_rate_idx;
2231 if (sband->band == IEEE80211_BAND_5GHZ &&
2232 lq_sta->max_rate_idx != -1)
2233 lq_sta->max_rate_idx += IL_FIRST_OFDM_RATE;
2234 if (lq_sta->max_rate_idx < 0 ||
2235 lq_sta->max_rate_idx >= RATE_COUNT)
2236 lq_sta->max_rate_idx = -1;
2237 }
2238
2239 /* Treat uninitialized rate scaling data same as non-existing. */
2240 if (lq_sta && !lq_sta->drv) {
2241 D_RATE("Rate scaling not initialized yet.\n");
2242 il_sta = NULL;
2243 }
2244
2245 /* Send management frames and NO_ACK data using lowest rate. */
2246 if (rate_control_send_low(sta, il_sta, txrc))
2247 return;
2248
2249 if (!lq_sta)
2250 return;
2251
2252 rate_idx = lq_sta->last_txrate_idx;
2253
2254 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2255 rate_idx -= IL_FIRST_OFDM_RATE;
2256 /* 6M and 9M shared same MCS idx */
2257 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2258 if (il4965_rs_extract_rate(lq_sta->last_rate_n_flags) >=
2259 RATE_MIMO2_6M_PLCP)
2260 rate_idx = rate_idx + MCS_IDX_PER_STREAM;
2261 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2262 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2263 info->control.rates[0].flags |=
2264 IEEE80211_TX_RC_SHORT_GI;
2265 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2266 info->control.rates[0].flags |=
2267 IEEE80211_TX_RC_DUP_DATA;
2268 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2269 info->control.rates[0].flags |=
2270 IEEE80211_TX_RC_40_MHZ_WIDTH;
2271 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2272 info->control.rates[0].flags |=
2273 IEEE80211_TX_RC_GREEN_FIELD;
2274 } else {
2275 /* Check for invalid rates */
2276 if (rate_idx < 0 || rate_idx >= RATE_COUNT_LEGACY ||
2277 (sband->band == IEEE80211_BAND_5GHZ &&
2278 rate_idx < IL_FIRST_OFDM_RATE))
2279 rate_idx = rate_lowest_index(sband, sta);
2280 /* On valid 5 GHz rate, adjust idx */
2281 else if (sband->band == IEEE80211_BAND_5GHZ)
2282 rate_idx -= IL_FIRST_OFDM_RATE;
2283 info->control.rates[0].flags = 0;
2284 }
2285 info->control.rates[0].idx = rate_idx;
2286
2287 }
2288
2289 static void *
2290 il4965_rs_alloc_sta(void *il_rate, struct ieee80211_sta *sta, gfp_t gfp)
2291 {
2292 struct il_station_priv *sta_priv =
2293 (struct il_station_priv *)sta->drv_priv;
2294 struct il_priv *il;
2295
2296 il = (struct il_priv *)il_rate;
2297 D_RATE("create station rate scale win\n");
2298
2299 return &sta_priv->lq_sta;
2300 }
2301
2302 /*
2303 * Called after adding a new station to initialize rate scaling
2304 */
2305 void
2306 il4965_rs_rate_init(struct il_priv *il, struct ieee80211_sta *sta, u8 sta_id)
2307 {
2308 int i, j;
2309 struct ieee80211_hw *hw = il->hw;
2310 struct ieee80211_conf *conf = &il->hw->conf;
2311 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2312 struct il_station_priv *sta_priv;
2313 struct il_lq_sta *lq_sta;
2314 struct ieee80211_supported_band *sband;
2315
2316 sta_priv = (struct il_station_priv *)sta->drv_priv;
2317 lq_sta = &sta_priv->lq_sta;
2318 sband = hw->wiphy->bands[conf->channel->band];
2319
2320 lq_sta->lq.sta_id = sta_id;
2321
2322 for (j = 0; j < LQ_SIZE; j++)
2323 for (i = 0; i < RATE_COUNT; i++)
2324 il4965_rs_rate_scale_clear_win(&lq_sta->lq_info[j].
2325 win[i]);
2326
2327 lq_sta->flush_timer = 0;
2328 lq_sta->supp_rates = sta->supp_rates[sband->band];
2329 for (j = 0; j < LQ_SIZE; j++)
2330 for (i = 0; i < RATE_COUNT; i++)
2331 il4965_rs_rate_scale_clear_win(&lq_sta->lq_info[j].
2332 win[i]);
2333
2334 D_RATE("LQ:" "*** rate scale station global init for station %d ***\n",
2335 sta_id);
2336 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2337 * the lowest or the highest rate.. Could consider using RSSI from
2338 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2339 * after assoc.. */
2340
2341 lq_sta->is_dup = 0;
2342 lq_sta->max_rate_idx = -1;
2343 lq_sta->missed_rate_counter = IL_MISSED_RATE_MAX;
2344 lq_sta->is_green = il4965_rs_use_green(sta);
2345 lq_sta->active_legacy_rate = il->active_rate & ~(0x1000);
2346 lq_sta->band = il->band;
2347 /*
2348 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2349 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2350 */
2351 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2352 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2353 lq_sta->active_siso_rate &= ~((u16) 0x2);
2354 lq_sta->active_siso_rate <<= IL_FIRST_OFDM_RATE;
2355
2356 /* Same here */
2357 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2358 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2359 lq_sta->active_mimo2_rate &= ~((u16) 0x2);
2360 lq_sta->active_mimo2_rate <<= IL_FIRST_OFDM_RATE;
2361
2362 /* These values will be overridden later */
2363 lq_sta->lq.general_params.single_stream_ant_msk =
2364 il4965_first_antenna(il->hw_params.valid_tx_ant);
2365 lq_sta->lq.general_params.dual_stream_ant_msk =
2366 il->hw_params.valid_tx_ant & ~il4965_first_antenna(il->hw_params.
2367 valid_tx_ant);
2368 if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2369 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2370 } else if (il4965_num_of_ant(il->hw_params.valid_tx_ant) == 2) {
2371 lq_sta->lq.general_params.dual_stream_ant_msk =
2372 il->hw_params.valid_tx_ant;
2373 }
2374
2375 /* as default allow aggregation for all tids */
2376 lq_sta->tx_agg_tid_en = IL_AGG_ALL_TID;
2377 lq_sta->drv = il;
2378
2379 /* Set last_txrate_idx to lowest rate */
2380 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2381 if (sband->band == IEEE80211_BAND_5GHZ)
2382 lq_sta->last_txrate_idx += IL_FIRST_OFDM_RATE;
2383 lq_sta->is_agg = 0;
2384
2385 #ifdef CONFIG_MAC80211_DEBUGFS
2386 lq_sta->dbg_fixed_rate = 0;
2387 #endif
2388
2389 il4965_rs_initialize_lq(il, conf, sta, lq_sta);
2390 }
2391
2392 static void
2393 il4965_rs_fill_link_cmd(struct il_priv *il, struct il_lq_sta *lq_sta,
2394 u32 new_rate)
2395 {
2396 struct il_scale_tbl_info tbl_type;
2397 int idx = 0;
2398 int rate_idx;
2399 int repeat_rate = 0;
2400 u8 ant_toggle_cnt = 0;
2401 u8 use_ht_possible = 1;
2402 u8 valid_tx_ant = 0;
2403 struct il_link_quality_cmd *lq_cmd = &lq_sta->lq;
2404
2405 /* Override starting rate (idx 0) if needed for debug purposes */
2406 il4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, idx);
2407
2408 /* Interpret new_rate (rate_n_flags) */
2409 il4965_rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2410 &rate_idx);
2411
2412 /* How many times should we repeat the initial rate? */
2413 if (is_legacy(tbl_type.lq_type)) {
2414 ant_toggle_cnt = 1;
2415 repeat_rate = IL_NUMBER_TRY;
2416 } else {
2417 repeat_rate = IL_HT_NUMBER_TRY;
2418 }
2419
2420 lq_cmd->general_params.mimo_delimiter =
2421 is_mimo(tbl_type.lq_type) ? 1 : 0;
2422
2423 /* Fill 1st table entry (idx 0) */
2424 lq_cmd->rs_table[idx].rate_n_flags = cpu_to_le32(new_rate);
2425
2426 if (il4965_num_of_ant(tbl_type.ant_type) == 1) {
2427 lq_cmd->general_params.single_stream_ant_msk =
2428 tbl_type.ant_type;
2429 } else if (il4965_num_of_ant(tbl_type.ant_type) == 2) {
2430 lq_cmd->general_params.dual_stream_ant_msk = tbl_type.ant_type;
2431 }
2432 /* otherwise we don't modify the existing value */
2433 idx++;
2434 repeat_rate--;
2435 if (il)
2436 valid_tx_ant = il->hw_params.valid_tx_ant;
2437
2438 /* Fill rest of rate table */
2439 while (idx < LINK_QUAL_MAX_RETRY_NUM) {
2440 /* Repeat initial/next rate.
2441 * For legacy IL_NUMBER_TRY == 1, this loop will not execute.
2442 * For HT IL_HT_NUMBER_TRY == 3, this executes twice. */
2443 while (repeat_rate > 0 && idx < LINK_QUAL_MAX_RETRY_NUM) {
2444 if (is_legacy(tbl_type.lq_type)) {
2445 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2446 ant_toggle_cnt++;
2447 else if (il &&
2448 il4965_rs_toggle_antenna(valid_tx_ant,
2449 &new_rate,
2450 &tbl_type))
2451 ant_toggle_cnt = 1;
2452 }
2453
2454 /* Override next rate if needed for debug purposes */
2455 il4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, idx);
2456
2457 /* Fill next table entry */
2458 lq_cmd->rs_table[idx].rate_n_flags =
2459 cpu_to_le32(new_rate);
2460 repeat_rate--;
2461 idx++;
2462 }
2463
2464 il4965_rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2465 &tbl_type, &rate_idx);
2466
2467 /* Indicate to uCode which entries might be MIMO.
2468 * If initial rate was MIMO, this will finally end up
2469 * as (IL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2470 if (is_mimo(tbl_type.lq_type))
2471 lq_cmd->general_params.mimo_delimiter = idx;
2472
2473 /* Get next rate */
2474 new_rate =
2475 il4965_rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2476 use_ht_possible);
2477
2478 /* How many times should we repeat the next rate? */
2479 if (is_legacy(tbl_type.lq_type)) {
2480 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2481 ant_toggle_cnt++;
2482 else if (il &&
2483 il4965_rs_toggle_antenna(valid_tx_ant,
2484 &new_rate, &tbl_type))
2485 ant_toggle_cnt = 1;
2486
2487 repeat_rate = IL_NUMBER_TRY;
2488 } else {
2489 repeat_rate = IL_HT_NUMBER_TRY;
2490 }
2491
2492 /* Don't allow HT rates after next pass.
2493 * il4965_rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2494 use_ht_possible = 0;
2495
2496 /* Override next rate if needed for debug purposes */
2497 il4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, idx);
2498
2499 /* Fill next table entry */
2500 lq_cmd->rs_table[idx].rate_n_flags = cpu_to_le32(new_rate);
2501
2502 idx++;
2503 repeat_rate--;
2504 }
2505
2506 lq_cmd->agg_params.agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2507 lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2508
2509 lq_cmd->agg_params.agg_time_limit =
2510 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2511 }
2512
2513 static void *
2514 il4965_rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2515 {
2516 return hw->priv;
2517 }
2518
2519 /* rate scale requires free function to be implemented */
2520 static void
2521 il4965_rs_free(void *il_rate)
2522 {
2523 return;
2524 }
2525
2526 static void
2527 il4965_rs_free_sta(void *il_r, struct ieee80211_sta *sta, void *il_sta)
2528 {
2529 struct il_priv *il __maybe_unused = il_r;
2530
2531 D_RATE("enter\n");
2532 D_RATE("leave\n");
2533 }
2534
2535 #ifdef CONFIG_MAC80211_DEBUGFS
2536 static int
2537 il4965_open_file_generic(struct inode *inode, struct file *file)
2538 {
2539 file->private_data = inode->i_private;
2540 return 0;
2541 }
2542
2543 static void
2544 il4965_rs_dbgfs_set_mcs(struct il_lq_sta *lq_sta, u32 * rate_n_flags, int idx)
2545 {
2546 struct il_priv *il;
2547 u8 valid_tx_ant;
2548 u8 ant_sel_tx;
2549
2550 il = lq_sta->drv;
2551 valid_tx_ant = il->hw_params.valid_tx_ant;
2552 if (lq_sta->dbg_fixed_rate) {
2553 ant_sel_tx =
2554 ((lq_sta->
2555 dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK) >>
2556 RATE_MCS_ANT_POS);
2557 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
2558 *rate_n_flags = lq_sta->dbg_fixed_rate;
2559 D_RATE("Fixed rate ON\n");
2560 } else {
2561 lq_sta->dbg_fixed_rate = 0;
2562 IL_ERR
2563 ("Invalid antenna selection 0x%X, Valid is 0x%X\n",
2564 ant_sel_tx, valid_tx_ant);
2565 D_RATE("Fixed rate OFF\n");
2566 }
2567 } else {
2568 D_RATE("Fixed rate OFF\n");
2569 }
2570 }
2571
2572 static ssize_t
2573 il4965_rs_sta_dbgfs_scale_table_write(struct file *file,
2574 const char __user *user_buf,
2575 size_t count, loff_t *ppos)
2576 {
2577 struct il_lq_sta *lq_sta = file->private_data;
2578 struct il_priv *il;
2579 char buf[64];
2580 size_t buf_size;
2581 u32 parsed_rate;
2582 struct il_station_priv *sta_priv =
2583 container_of(lq_sta, struct il_station_priv, lq_sta);
2584 struct il_rxon_context *ctx = sta_priv->common.ctx;
2585
2586 il = lq_sta->drv;
2587 memset(buf, 0, sizeof(buf));
2588 buf_size = min(count, sizeof(buf) - 1);
2589 if (copy_from_user(buf, user_buf, buf_size))
2590 return -EFAULT;
2591
2592 if (sscanf(buf, "%x", &parsed_rate) == 1)
2593 lq_sta->dbg_fixed_rate = parsed_rate;
2594 else
2595 lq_sta->dbg_fixed_rate = 0;
2596
2597 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2598 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2599 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2600
2601 D_RATE("sta_id %d rate 0x%X\n", lq_sta->lq.sta_id,
2602 lq_sta->dbg_fixed_rate);
2603
2604 if (lq_sta->dbg_fixed_rate) {
2605 il4965_rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2606 il_send_lq_cmd(lq_sta->drv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2607 }
2608
2609 return count;
2610 }
2611
2612 static ssize_t
2613 il4965_rs_sta_dbgfs_scale_table_read(struct file *file, char __user *user_buf,
2614 size_t count, loff_t *ppos)
2615 {
2616 char *buff;
2617 int desc = 0;
2618 int i = 0;
2619 int idx = 0;
2620 ssize_t ret;
2621
2622 struct il_lq_sta *lq_sta = file->private_data;
2623 struct il_priv *il;
2624 struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2625
2626 il = lq_sta->drv;
2627 buff = kmalloc(1024, GFP_KERNEL);
2628 if (!buff)
2629 return -ENOMEM;
2630
2631 desc += sprintf(buff + desc, "sta_id %d\n", lq_sta->lq.sta_id);
2632 desc +=
2633 sprintf(buff + desc, "failed=%d success=%d rate=0%X\n",
2634 lq_sta->total_failed, lq_sta->total_success,
2635 lq_sta->active_legacy_rate);
2636 desc +=
2637 sprintf(buff + desc, "fixed rate 0x%X\n", lq_sta->dbg_fixed_rate);
2638 desc +=
2639 sprintf(buff + desc, "valid_tx_ant %s%s%s\n",
2640 (il->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
2641 (il->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
2642 (il->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
2643 desc +=
2644 sprintf(buff + desc, "lq type %s\n",
2645 (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
2646 if (is_Ht(tbl->lq_type)) {
2647 desc +=
2648 sprintf(buff + desc, " %s",
2649 (is_siso(tbl->lq_type)) ? "SISO" : "MIMO2");
2650 desc +=
2651 sprintf(buff + desc, " %s",
2652 (tbl->is_ht40) ? "40MHz" : "20MHz");
2653 desc +=
2654 sprintf(buff + desc, " %s %s %s\n",
2655 (tbl->is_SGI) ? "SGI" : "",
2656 (lq_sta->is_green) ? "GF enabled" : "",
2657 (lq_sta->is_agg) ? "AGG on" : "");
2658 }
2659 desc +=
2660 sprintf(buff + desc, "last tx rate=0x%X\n",
2661 lq_sta->last_rate_n_flags);
2662 desc +=
2663 sprintf(buff + desc,
2664 "general:" "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2665 lq_sta->lq.general_params.flags,
2666 lq_sta->lq.general_params.mimo_delimiter,
2667 lq_sta->lq.general_params.single_stream_ant_msk,
2668 lq_sta->lq.general_params.dual_stream_ant_msk);
2669
2670 desc +=
2671 sprintf(buff + desc,
2672 "agg:"
2673 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2674 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2675 lq_sta->lq.agg_params.agg_dis_start_th,
2676 lq_sta->lq.agg_params.agg_frame_cnt_limit);
2677
2678 desc +=
2679 sprintf(buff + desc,
2680 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2681 lq_sta->lq.general_params.start_rate_idx[0],
2682 lq_sta->lq.general_params.start_rate_idx[1],
2683 lq_sta->lq.general_params.start_rate_idx[2],
2684 lq_sta->lq.general_params.start_rate_idx[3]);
2685
2686 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2687 idx =
2688 il4965_hwrate_to_plcp_idx(le32_to_cpu
2689 (lq_sta->lq.rs_table[i].
2690 rate_n_flags));
2691 if (is_legacy(tbl->lq_type)) {
2692 desc +=
2693 sprintf(buff + desc, " rate[%d] 0x%X %smbps\n", i,
2694 le32_to_cpu(lq_sta->lq.rs_table[i].
2695 rate_n_flags),
2696 il_rate_mcs[idx].mbps);
2697 } else {
2698 desc +=
2699 sprintf(buff + desc, " rate[%d] 0x%X %smbps (%s)\n",
2700 i,
2701 le32_to_cpu(lq_sta->lq.rs_table[i].
2702 rate_n_flags),
2703 il_rate_mcs[idx].mbps,
2704 il_rate_mcs[idx].mcs);
2705 }
2706 }
2707
2708 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2709 kfree(buff);
2710 return ret;
2711 }
2712
2713 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2714 .write = il4965_rs_sta_dbgfs_scale_table_write,
2715 .read = il4965_rs_sta_dbgfs_scale_table_read,
2716 .open = il4965_open_file_generic,
2717 .llseek = default_llseek,
2718 };
2719
2720 static ssize_t
2721 il4965_rs_sta_dbgfs_stats_table_read(struct file *file, char __user *user_buf,
2722 size_t count, loff_t *ppos)
2723 {
2724 char *buff;
2725 int desc = 0;
2726 int i, j;
2727 ssize_t ret;
2728
2729 struct il_lq_sta *lq_sta = file->private_data;
2730
2731 buff = kmalloc(1024, GFP_KERNEL);
2732 if (!buff)
2733 return -ENOMEM;
2734
2735 for (i = 0; i < LQ_SIZE; i++) {
2736 desc +=
2737 sprintf(buff + desc,
2738 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
2739 "rate=0x%X\n", lq_sta->active_tbl == i ? "*" : "x",
2740 lq_sta->lq_info[i].lq_type,
2741 lq_sta->lq_info[i].is_SGI,
2742 lq_sta->lq_info[i].is_ht40,
2743 lq_sta->lq_info[i].is_dup, lq_sta->is_green,
2744 lq_sta->lq_info[i].current_rate);
2745 for (j = 0; j < RATE_COUNT; j++) {
2746 desc +=
2747 sprintf(buff + desc,
2748 "counter=%d success=%d %%=%d\n",
2749 lq_sta->lq_info[i].win[j].counter,
2750 lq_sta->lq_info[i].win[j].success_counter,
2751 lq_sta->lq_info[i].win[j].success_ratio);
2752 }
2753 }
2754 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2755 kfree(buff);
2756 return ret;
2757 }
2758
2759 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2760 .read = il4965_rs_sta_dbgfs_stats_table_read,
2761 .open = il4965_open_file_generic,
2762 .llseek = default_llseek,
2763 };
2764
2765 static ssize_t
2766 il4965_rs_sta_dbgfs_rate_scale_data_read(struct file *file,
2767 char __user *user_buf, size_t count,
2768 loff_t *ppos)
2769 {
2770 char buff[120];
2771 int desc = 0;
2772 struct il_lq_sta *lq_sta = file->private_data;
2773 struct il_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
2774
2775 if (is_Ht(tbl->lq_type))
2776 desc +=
2777 sprintf(buff + desc, "Bit Rate= %d Mb/s\n",
2778 tbl->expected_tpt[lq_sta->last_txrate_idx]);
2779 else
2780 desc +=
2781 sprintf(buff + desc, "Bit Rate= %d Mb/s\n",
2782 il_rates[lq_sta->last_txrate_idx].ieee >> 1);
2783
2784 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2785 }
2786
2787 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
2788 .read = il4965_rs_sta_dbgfs_rate_scale_data_read,
2789 .open = il4965_open_file_generic,
2790 .llseek = default_llseek,
2791 };
2792
2793 static void
2794 il4965_rs_add_debugfs(void *il, void *il_sta, struct dentry *dir)
2795 {
2796 struct il_lq_sta *lq_sta = il_sta;
2797 lq_sta->rs_sta_dbgfs_scale_table_file =
2798 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
2799 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2800 lq_sta->rs_sta_dbgfs_stats_table_file =
2801 debugfs_create_file("rate_stats_table", S_IRUSR, dir, lq_sta,
2802 &rs_sta_dbgfs_stats_table_ops);
2803 lq_sta->rs_sta_dbgfs_rate_scale_data_file =
2804 debugfs_create_file("rate_scale_data", S_IRUSR, dir, lq_sta,
2805 &rs_sta_dbgfs_rate_scale_data_ops);
2806 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2807 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
2808 &lq_sta->tx_agg_tid_en);
2809
2810 }
2811
2812 static void
2813 il4965_rs_remove_debugfs(void *il, void *il_sta)
2814 {
2815 struct il_lq_sta *lq_sta = il_sta;
2816 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2817 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2818 debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
2819 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2820 }
2821 #endif
2822
2823 /*
2824 * Initialization of rate scaling information is done by driver after
2825 * the station is added. Since mac80211 calls this function before a
2826 * station is added we ignore it.
2827 */
2828 static void
2829 il4965_rs_rate_init_stub(void *il_r, struct ieee80211_supported_band *sband,
2830 struct ieee80211_sta *sta, void *il_sta)
2831 {
2832 }
2833
2834 static struct rate_control_ops rs_4965_ops = {
2835 .module = NULL,
2836 .name = IL4965_RS_NAME,
2837 .tx_status = il4965_rs_tx_status,
2838 .get_rate = il4965_rs_get_rate,
2839 .rate_init = il4965_rs_rate_init_stub,
2840 .alloc = il4965_rs_alloc,
2841 .free = il4965_rs_free,
2842 .alloc_sta = il4965_rs_alloc_sta,
2843 .free_sta = il4965_rs_free_sta,
2844 #ifdef CONFIG_MAC80211_DEBUGFS
2845 .add_sta_debugfs = il4965_rs_add_debugfs,
2846 .remove_sta_debugfs = il4965_rs_remove_debugfs,
2847 #endif
2848 };
2849
2850 int
2851 il4965_rate_control_register(void)
2852 {
2853 return ieee80211_rate_control_register(&rs_4965_ops);
2854 }
2855
2856 void
2857 il4965_rate_control_unregister(void)
2858 {
2859 ieee80211_rate_control_unregister(&rs_4965_ops);
2860 }