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i2c: gpio: fault-injector: refactor incomplete transfer
[linux/fpc-iii.git] / drivers / net / wireless / intel / iwlegacy / 4965-rs.c
blob54ff83829afb11dcc8c56871bac3d1543e3fa33b
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/skbuff.h>
28 #include <linux/slab.h>
29 #include <net/mac80211.h>
30
31 #include <linux/netdevice.h>
32 #include <linux/etherdevice.h>
33 #include <linux/delay.h>
34
35 #include <linux/workqueue.h>
36
37 #include "common.h"
38 #include "4965.h"
39
40 #define IL4965_RS_NAME "iwl-4965-rs"
41
42 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
43 #define IL_NUMBER_TRY 1
44 #define IL_HT_NUMBER_TRY 3
45
46 #define RATE_MAX_WINDOW 62 /* # tx in history win */
47 #define RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
48 #define RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
49
50 /* max allowed rate miss before sync LQ cmd */
51 #define IL_MISSED_RATE_MAX 15
52 /* max time to accum history 2 seconds */
53 #define RATE_SCALE_FLUSH_INTVL (3*HZ)
54
55 static u8 rs_ht_to_legacy[] = {
56 RATE_6M_IDX, RATE_6M_IDX,
57 RATE_6M_IDX, RATE_6M_IDX,
58 RATE_6M_IDX,
59 RATE_6M_IDX, RATE_9M_IDX,
60 RATE_12M_IDX, RATE_18M_IDX,
61 RATE_24M_IDX, RATE_36M_IDX,
62 RATE_48M_IDX, RATE_54M_IDX
63 };
64
65 static const u8 ant_toggle_lookup[] = {
66 /*ANT_NONE -> */ ANT_NONE,
67 /*ANT_A -> */ ANT_B,
68 /*ANT_B -> */ ANT_C,
69 /*ANT_AB -> */ ANT_BC,
70 /*ANT_C -> */ ANT_A,
71 /*ANT_AC -> */ ANT_AB,
72 /*ANT_BC -> */ ANT_AC,
73 /*ANT_ABC -> */ ANT_ABC,
74 };
75
76 #define IL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np) \
77 [RATE_##r##M_IDX] = { RATE_##r##M_PLCP, \
78 RATE_SISO_##s##M_PLCP, \
79 RATE_MIMO2_##s##M_PLCP,\
80 RATE_##r##M_IEEE, \
81 RATE_##ip##M_IDX, \
82 RATE_##in##M_IDX, \
83 RATE_##rp##M_IDX, \
84 RATE_##rn##M_IDX, \
85 RATE_##pp##M_IDX, \
86 RATE_##np##M_IDX }
87
88 /*
89 * Parameter order:
90 * rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
91 *
92 * If there isn't a valid next or previous rate then INV is used which
93 * maps to RATE_INVALID
94 *
95 */
96 const struct il_rate_info il_rates[RATE_COUNT] = {
97 IL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2), /* 1mbps */
98 IL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5), /* 2mbps */
99 IL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11), /*5.5mbps */
100 IL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18), /* 11mbps */
101 IL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11), /* 6mbps */
102 IL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11), /* 9mbps */
103 IL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18), /* 12mbps */
104 IL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24), /* 18mbps */
105 IL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36), /* 24mbps */
106 IL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48), /* 36mbps */
107 IL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54), /* 48mbps */
108 IL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
109 IL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
110 };
111
112 static int
113 il4965_hwrate_to_plcp_idx(u32 rate_n_flags)
114 {
115 int idx = 0;
116
117 /* HT rate format */
118 if (rate_n_flags & RATE_MCS_HT_MSK) {
119 idx = (rate_n_flags & 0xff);
120
121 if (idx >= RATE_MIMO2_6M_PLCP)
122 idx = idx - RATE_MIMO2_6M_PLCP;
123
124 idx += IL_FIRST_OFDM_RATE;
125 /* skip 9M not supported in ht */
126 if (idx >= RATE_9M_IDX)
127 idx += 1;
128 if (idx >= IL_FIRST_OFDM_RATE && idx <= IL_LAST_OFDM_RATE)
129 return idx;
130
131 /* legacy rate format, search for match in table */
132 } else {
133 for (idx = 0; idx < ARRAY_SIZE(il_rates); idx++)
134 if (il_rates[idx].plcp == (rate_n_flags & 0xFF))
135 return idx;
136 }
137
138 return -1;
139 }
140
141 static void il4965_rs_rate_scale_perform(struct il_priv *il,
142 struct sk_buff *skb,
143 struct ieee80211_sta *sta,
144 struct il_lq_sta *lq_sta);
145 static void il4965_rs_fill_link_cmd(struct il_priv *il,
146 struct il_lq_sta *lq_sta, u32 rate_n_flags);
147 static void il4965_rs_stay_in_table(struct il_lq_sta *lq_sta,
148 bool force_search);
149
150 #ifdef CONFIG_MAC80211_DEBUGFS
151 static void il4965_rs_dbgfs_set_mcs(struct il_lq_sta *lq_sta,
152 u32 *rate_n_flags, int idx);
153 #else
154 static void
155 il4965_rs_dbgfs_set_mcs(struct il_lq_sta *lq_sta, u32 * rate_n_flags, int idx)
156 {
157 }
158 #endif
159
160 /**
161 * The following tables contain the expected throughput metrics for all rates
162 *
163 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
164 *
165 * where invalid entries are zeros.
166 *
167 * CCK rates are only valid in legacy table and will only be used in G
168 * (2.4 GHz) band.
169 */
170
171 static s32 expected_tpt_legacy[RATE_COUNT] = {
172 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
173 };
174
175 static s32 expected_tpt_siso20MHz[4][RATE_COUNT] = {
176 {0, 0, 0, 0, 42, 0, 76, 102, 124, 158, 183, 193, 202}, /* Norm */
177 {0, 0, 0, 0, 46, 0, 82, 110, 132, 167, 192, 202, 210}, /* SGI */
178 {0, 0, 0, 0, 48, 0, 93, 135, 176, 251, 319, 351, 381}, /* AGG */
179 {0, 0, 0, 0, 53, 0, 102, 149, 193, 275, 348, 381, 413}, /* AGG+SGI */
180 };
181
182 static s32 expected_tpt_siso40MHz[4][RATE_COUNT] = {
183 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
184 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
185 {0, 0, 0, 0, 96, 0, 182, 259, 328, 451, 553, 598, 640}, /* AGG */
186 {0, 0, 0, 0, 106, 0, 199, 282, 357, 487, 593, 640, 683}, /* AGG+SGI */
187 };
188
189 static s32 expected_tpt_mimo2_20MHz[4][RATE_COUNT] = {
190 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250}, /* Norm */
191 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256}, /* SGI */
192 {0, 0, 0, 0, 92, 0, 175, 250, 317, 436, 534, 578, 619}, /* AGG */
193 {0, 0, 0, 0, 102, 0, 192, 273, 344, 470, 573, 619, 660}, /* AGG+SGI */
194 };
195
196 static s32 expected_tpt_mimo2_40MHz[4][RATE_COUNT] = {
197 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
198 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
199 {0, 0, 0, 0, 180, 0, 327, 446, 545, 708, 828, 878, 922}, /* AGG */
200 {0, 0, 0, 0, 197, 0, 355, 481, 584, 752, 872, 922, 966}, /* AGG+SGI */
201 };
202
203 /* mbps, mcs */
204 static const struct il_rate_mcs_info il_rate_mcs[RATE_COUNT] = {
205 {"1", "BPSK DSSS"},
206 {"2", "QPSK DSSS"},
207 {"5.5", "BPSK CCK"},
208 {"11", "QPSK CCK"},
209 {"6", "BPSK 1/2"},
210 {"9", "BPSK 1/2"},
211 {"12", "QPSK 1/2"},
212 {"18", "QPSK 3/4"},
213 {"24", "16QAM 1/2"},
214 {"36", "16QAM 3/4"},
215 {"48", "64QAM 2/3"},
216 {"54", "64QAM 3/4"},
217 {"60", "64QAM 5/6"},
218 };
219
220 #define MCS_IDX_PER_STREAM (8)
221
222 static inline u8
223 il4965_rs_extract_rate(u32 rate_n_flags)
224 {
225 return (u8) (rate_n_flags & 0xFF);
226 }
227
228 static void
229 il4965_rs_rate_scale_clear_win(struct il_rate_scale_data *win)
230 {
231 win->data = 0;
232 win->success_counter = 0;
233 win->success_ratio = IL_INVALID_VALUE;
234 win->counter = 0;
235 win->average_tpt = IL_INVALID_VALUE;
236 win->stamp = 0;
237 }
238
239 static inline u8
240 il4965_rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
241 {
242 return (ant_type & valid_antenna) == ant_type;
243 }
244
245 /*
246 * removes the old data from the stats. All data that is older than
247 * TID_MAX_TIME_DIFF, will be deleted.
248 */
249 static void
250 il4965_rs_tl_rm_old_stats(struct il_traffic_load *tl, u32 curr_time)
251 {
252 /* The oldest age we want to keep */
253 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
254
255 while (tl->queue_count && tl->time_stamp < oldest_time) {
256 tl->total -= tl->packet_count[tl->head];
257 tl->packet_count[tl->head] = 0;
258 tl->time_stamp += TID_QUEUE_CELL_SPACING;
259 tl->queue_count--;
260 tl->head++;
261 if (tl->head >= TID_QUEUE_MAX_SIZE)
262 tl->head = 0;
263 }
264 }
265
266 /*
267 * increment traffic load value for tid and also remove
268 * any old values if passed the certain time period
269 */
270 static u8
271 il4965_rs_tl_add_packet(struct il_lq_sta *lq_data, struct ieee80211_hdr *hdr)
272 {
273 u32 curr_time = jiffies_to_msecs(jiffies);
274 u32 time_diff;
275 s32 idx;
276 struct il_traffic_load *tl = NULL;
277 u8 tid;
278
279 if (ieee80211_is_data_qos(hdr->frame_control)) {
280 u8 *qc = ieee80211_get_qos_ctl(hdr);
281 tid = qc[0] & 0xf;
282 } else
283 return MAX_TID_COUNT;
284
285 if (unlikely(tid >= TID_MAX_LOAD_COUNT))
286 return MAX_TID_COUNT;
287
288 tl = &lq_data->load[tid];
289
290 curr_time -= curr_time % TID_ROUND_VALUE;
291
292 /* Happens only for the first packet. Initialize the data */
293 if (!(tl->queue_count)) {
294 tl->total = 1;
295 tl->time_stamp = curr_time;
296 tl->queue_count = 1;
297 tl->head = 0;
298 tl->packet_count[0] = 1;
299 return MAX_TID_COUNT;
300 }
301
302 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
303 idx = time_diff / TID_QUEUE_CELL_SPACING;
304
305 /* The history is too long: remove data that is older than */
306 /* TID_MAX_TIME_DIFF */
307 if (idx >= TID_QUEUE_MAX_SIZE)
308 il4965_rs_tl_rm_old_stats(tl, curr_time);
309
310 idx = (tl->head + idx) % TID_QUEUE_MAX_SIZE;
311 tl->packet_count[idx] = tl->packet_count[idx] + 1;
312 tl->total = tl->total + 1;
313
314 if ((idx + 1) > tl->queue_count)
315 tl->queue_count = idx + 1;
316
317 return tid;
318 }
319
320 /*
321 get the traffic load value for tid
322 */
323 static u32
324 il4965_rs_tl_get_load(struct il_lq_sta *lq_data, u8 tid)
325 {
326 u32 curr_time = jiffies_to_msecs(jiffies);
327 u32 time_diff;
328 s32 idx;
329 struct il_traffic_load *tl = NULL;
330
331 if (tid >= TID_MAX_LOAD_COUNT)
332 return 0;
333
334 tl = &(lq_data->load[tid]);
335
336 curr_time -= curr_time % TID_ROUND_VALUE;
337
338 if (!(tl->queue_count))
339 return 0;
340
341 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
342 idx = time_diff / TID_QUEUE_CELL_SPACING;
343
344 /* The history is too long: remove data that is older than */
345 /* TID_MAX_TIME_DIFF */
346 if (idx >= TID_QUEUE_MAX_SIZE)
347 il4965_rs_tl_rm_old_stats(tl, curr_time);
348
349 return tl->total;
350 }
351
352 static int
353 il4965_rs_tl_turn_on_agg_for_tid(struct il_priv *il, struct il_lq_sta *lq_data,
354 u8 tid, struct ieee80211_sta *sta)
355 {
356 int ret = -EAGAIN;
357 u32 load;
358
359 load = il4965_rs_tl_get_load(lq_data, tid);
360
361 if (load > IL_AGG_LOAD_THRESHOLD) {
362 D_HT("Starting Tx agg: STA: %pM tid: %d\n", sta->addr, tid);
363 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
364 if (ret == -EAGAIN) {
365 /*
366 * driver and mac80211 is out of sync
367 * this might be cause by reloading firmware
368 * stop the tx ba session here
369 */
370 IL_ERR("Fail start Tx agg on tid: %d\n", tid);
371 ieee80211_stop_tx_ba_session(sta, tid);
372 }
373 } else
374 D_HT("Aggregation not enabled for tid %d because load = %u\n",
375 tid, load);
376
377 return ret;
378 }
379
380 static void
381 il4965_rs_tl_turn_on_agg(struct il_priv *il, u8 tid, struct il_lq_sta *lq_data,
382 struct ieee80211_sta *sta)
383 {
384 if (tid < TID_MAX_LOAD_COUNT)
385 il4965_rs_tl_turn_on_agg_for_tid(il, lq_data, tid, sta);
386 else
387 IL_ERR("tid exceeds max load count: %d/%d\n", tid,
388 TID_MAX_LOAD_COUNT);
389 }
390
391 static inline int
392 il4965_get_il4965_num_of_ant_from_rate(u32 rate_n_flags)
393 {
394 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
395 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
396 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
397 }
398
399 /*
400 * Static function to get the expected throughput from an il_scale_tbl_info
401 * that wraps a NULL pointer check
402 */
403 static s32
404 il4965_get_expected_tpt(struct il_scale_tbl_info *tbl, int rs_idx)
405 {
406 if (tbl->expected_tpt)
407 return tbl->expected_tpt[rs_idx];
408 return 0;
409 }
410
411 /**
412 * il4965_rs_collect_tx_data - Update the success/failure sliding win
413 *
414 * We keep a sliding win of the last 62 packets transmitted
415 * at this rate. win->data contains the bitmask of successful
416 * packets.
417 */
418 static int
419 il4965_rs_collect_tx_data(struct il_scale_tbl_info *tbl, int scale_idx,
420 int attempts, int successes)
421 {
422 struct il_rate_scale_data *win = NULL;
423 static const u64 mask = (((u64) 1) << (RATE_MAX_WINDOW - 1));
424 s32 fail_count, tpt;
425
426 if (scale_idx < 0 || scale_idx >= RATE_COUNT)
427 return -EINVAL;
428
429 /* Select win for current tx bit rate */
430 win = &(tbl->win[scale_idx]);
431
432 /* Get expected throughput */
433 tpt = il4965_get_expected_tpt(tbl, scale_idx);
434
435 /*
436 * Keep track of only the latest 62 tx frame attempts in this rate's
437 * history win; anything older isn't really relevant any more.
438 * If we have filled up the sliding win, drop the oldest attempt;
439 * if the oldest attempt (highest bit in bitmap) shows "success",
440 * subtract "1" from the success counter (this is the main reason
441 * we keep these bitmaps!).
442 */
443 while (attempts > 0) {
444 if (win->counter >= RATE_MAX_WINDOW) {
445
446 /* remove earliest */
447 win->counter = RATE_MAX_WINDOW - 1;
448
449 if (win->data & mask) {
450 win->data &= ~mask;
451 win->success_counter--;
452 }
453 }
454
455 /* Increment frames-attempted counter */
456 win->counter++;
457
458 /* Shift bitmap by one frame to throw away oldest history */
459 win->data <<= 1;
460
461 /* Mark the most recent #successes attempts as successful */
462 if (successes > 0) {
463 win->success_counter++;
464 win->data |= 0x1;
465 successes--;
466 }
467
468 attempts--;
469 }
470
471 /* Calculate current success ratio, avoid divide-by-0! */
472 if (win->counter > 0)
473 win->success_ratio =
474 128 * (100 * win->success_counter) / win->counter;
475 else
476 win->success_ratio = IL_INVALID_VALUE;
477
478 fail_count = win->counter - win->success_counter;
479
480 /* Calculate average throughput, if we have enough history. */
481 if (fail_count >= RATE_MIN_FAILURE_TH ||
482 win->success_counter >= RATE_MIN_SUCCESS_TH)
483 win->average_tpt = (win->success_ratio * tpt + 64) / 128;
484 else
485 win->average_tpt = IL_INVALID_VALUE;
486
487 /* Tag this win as having been updated */
488 win->stamp = jiffies;
489
490 return 0;
491 }
492
493 /*
494 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
495 */
496 static u32
497 il4965_rate_n_flags_from_tbl(struct il_priv *il, struct il_scale_tbl_info *tbl,
498 int idx, u8 use_green)
499 {
500 u32 rate_n_flags = 0;
501
502 if (is_legacy(tbl->lq_type)) {
503 rate_n_flags = il_rates[idx].plcp;
504 if (idx >= IL_FIRST_CCK_RATE && idx <= IL_LAST_CCK_RATE)
505 rate_n_flags |= RATE_MCS_CCK_MSK;
506
507 } else if (is_Ht(tbl->lq_type)) {
508 if (idx > IL_LAST_OFDM_RATE) {
509 IL_ERR("Invalid HT rate idx %d\n", idx);
510 idx = IL_LAST_OFDM_RATE;
511 }
512 rate_n_flags = RATE_MCS_HT_MSK;
513
514 if (is_siso(tbl->lq_type))
515 rate_n_flags |= il_rates[idx].plcp_siso;
516 else
517 rate_n_flags |= il_rates[idx].plcp_mimo2;
518 } else {
519 IL_ERR("Invalid tbl->lq_type %d\n", tbl->lq_type);
520 }
521
522 rate_n_flags |=
523 ((tbl->ant_type << RATE_MCS_ANT_POS) & RATE_MCS_ANT_ABC_MSK);
524
525 if (is_Ht(tbl->lq_type)) {
526 if (tbl->is_ht40) {
527 if (tbl->is_dup)
528 rate_n_flags |= RATE_MCS_DUP_MSK;
529 else
530 rate_n_flags |= RATE_MCS_HT40_MSK;
531 }
532 if (tbl->is_SGI)
533 rate_n_flags |= RATE_MCS_SGI_MSK;
534
535 if (use_green) {
536 rate_n_flags |= RATE_MCS_GF_MSK;
537 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
538 rate_n_flags &= ~RATE_MCS_SGI_MSK;
539 IL_ERR("GF was set with SGI:SISO\n");
540 }
541 }
542 }
543 return rate_n_flags;
544 }
545
546 /*
547 * Interpret uCode API's rate_n_flags format,
548 * fill "search" or "active" tx mode table.
549 */
550 static int
551 il4965_rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
552 enum nl80211_band band,
553 struct il_scale_tbl_info *tbl, int *rate_idx)
554 {
555 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
556 u8 il4965_num_of_ant =
557 il4965_get_il4965_num_of_ant_from_rate(rate_n_flags);
558 u8 mcs;
559
560 memset(tbl, 0, sizeof(struct il_scale_tbl_info));
561 *rate_idx = il4965_hwrate_to_plcp_idx(rate_n_flags);
562
563 if (*rate_idx == RATE_INVALID) {
564 *rate_idx = -1;
565 return -EINVAL;
566 }
567 tbl->is_SGI = 0; /* default legacy setup */
568 tbl->is_ht40 = 0;
569 tbl->is_dup = 0;
570 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
571 tbl->lq_type = LQ_NONE;
572 tbl->max_search = IL_MAX_SEARCH;
573
574 /* legacy rate format */
575 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
576 if (il4965_num_of_ant == 1) {
577 if (band == NL80211_BAND_5GHZ)
578 tbl->lq_type = LQ_A;
579 else
580 tbl->lq_type = LQ_G;
581 }
582 /* HT rate format */
583 } else {
584 if (rate_n_flags & RATE_MCS_SGI_MSK)
585 tbl->is_SGI = 1;
586
587 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
588 (rate_n_flags & RATE_MCS_DUP_MSK))
589 tbl->is_ht40 = 1;
590
591 if (rate_n_flags & RATE_MCS_DUP_MSK)
592 tbl->is_dup = 1;
593
594 mcs = il4965_rs_extract_rate(rate_n_flags);
595
596 /* SISO */
597 if (mcs <= RATE_SISO_60M_PLCP) {
598 if (il4965_num_of_ant == 1)
599 tbl->lq_type = LQ_SISO; /*else NONE */
600 /* MIMO2 */
601 } else {
602 if (il4965_num_of_ant == 2)
603 tbl->lq_type = LQ_MIMO2;
604 }
605 }
606 return 0;
607 }
608
609 /* switch to another antenna/antennas and return 1 */
610 /* if no other valid antenna found, return 0 */
611 static int
612 il4965_rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
613 struct il_scale_tbl_info *tbl)
614 {
615 u8 new_ant_type;
616
617 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
618 return 0;
619
620 if (!il4965_rs_is_valid_ant(valid_ant, tbl->ant_type))
621 return 0;
622
623 new_ant_type = ant_toggle_lookup[tbl->ant_type];
624
625 while (new_ant_type != tbl->ant_type &&
626 !il4965_rs_is_valid_ant(valid_ant, new_ant_type))
627 new_ant_type = ant_toggle_lookup[new_ant_type];
628
629 if (new_ant_type == tbl->ant_type)
630 return 0;
631
632 tbl->ant_type = new_ant_type;
633 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
634 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
635 return 1;
636 }
637
638 /**
639 * Green-field mode is valid if the station supports it and
640 * there are no non-GF stations present in the BSS.
641 */
642 static bool
643 il4965_rs_use_green(struct il_priv *il, struct ieee80211_sta *sta)
644 {
645 return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
646 !il->ht.non_gf_sta_present;
647 }
648
649 /**
650 * il4965_rs_get_supported_rates - get the available rates
651 *
652 * if management frame or broadcast frame only return
653 * basic available rates.
654 *
655 */
656 static u16
657 il4965_rs_get_supported_rates(struct il_lq_sta *lq_sta,
658 struct ieee80211_hdr *hdr,
659 enum il_table_type rate_type)
660 {
661 if (is_legacy(rate_type)) {
662 return lq_sta->active_legacy_rate;
663 } else {
664 if (is_siso(rate_type))
665 return lq_sta->active_siso_rate;
666 else
667 return lq_sta->active_mimo2_rate;
668 }
669 }
670
671 static u16
672 il4965_rs_get_adjacent_rate(struct il_priv *il, u8 idx, u16 rate_mask,
673 int rate_type)
674 {
675 u8 high = RATE_INVALID;
676 u8 low = RATE_INVALID;
677
678 /* 802.11A or ht walks to the next literal adjacent rate in
679 * the rate table */
680 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
681 int i;
682 u32 mask;
683
684 /* Find the previous rate that is in the rate mask */
685 i = idx - 1;
686 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
687 if (rate_mask & mask) {
688 low = i;
689 break;
690 }
691 }
692
693 /* Find the next rate that is in the rate mask */
694 i = idx + 1;
695 for (mask = (1 << i); i < RATE_COUNT; i++, mask <<= 1) {
696 if (rate_mask & mask) {
697 high = i;
698 break;
699 }
700 }
701
702 return (high << 8) | low;
703 }
704
705 low = idx;
706 while (low != RATE_INVALID) {
707 low = il_rates[low].prev_rs;
708 if (low == RATE_INVALID)
709 break;
710 if (rate_mask & (1 << low))
711 break;
712 D_RATE("Skipping masked lower rate: %d\n", low);
713 }
714
715 high = idx;
716 while (high != RATE_INVALID) {
717 high = il_rates[high].next_rs;
718 if (high == RATE_INVALID)
719 break;
720 if (rate_mask & (1 << high))
721 break;
722 D_RATE("Skipping masked higher rate: %d\n", high);
723 }
724
725 return (high << 8) | low;
726 }
727
728 static u32
729 il4965_rs_get_lower_rate(struct il_lq_sta *lq_sta,
730 struct il_scale_tbl_info *tbl, u8 scale_idx,
731 u8 ht_possible)
732 {
733 s32 low;
734 u16 rate_mask;
735 u16 high_low;
736 u8 switch_to_legacy = 0;
737 u8 is_green = lq_sta->is_green;
738 struct il_priv *il = lq_sta->drv;
739
740 /* check if we need to switch from HT to legacy rates.
741 * assumption is that mandatory rates (1Mbps or 6Mbps)
742 * are always supported (spec demand) */
743 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_idx)) {
744 switch_to_legacy = 1;
745 scale_idx = rs_ht_to_legacy[scale_idx];
746 if (lq_sta->band == NL80211_BAND_5GHZ)
747 tbl->lq_type = LQ_A;
748 else
749 tbl->lq_type = LQ_G;
750
751 if (il4965_num_of_ant(tbl->ant_type) > 1)
752 tbl->ant_type =
753 il4965_first_antenna(il->hw_params.valid_tx_ant);
754
755 tbl->is_ht40 = 0;
756 tbl->is_SGI = 0;
757 tbl->max_search = IL_MAX_SEARCH;
758 }
759
760 rate_mask = il4965_rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
761
762 /* Mask with station rate restriction */
763 if (is_legacy(tbl->lq_type)) {
764 /* supp_rates has no CCK bits in A mode */
765 if (lq_sta->band == NL80211_BAND_5GHZ)
766 rate_mask =
767 (u16) (rate_mask &
768 (lq_sta->supp_rates << IL_FIRST_OFDM_RATE));
769 else
770 rate_mask = (u16) (rate_mask & lq_sta->supp_rates);
771 }
772
773 /* If we switched from HT to legacy, check current rate */
774 if (switch_to_legacy && (rate_mask & (1 << scale_idx))) {
775 low = scale_idx;
776 goto out;
777 }
778
779 high_low =
780 il4965_rs_get_adjacent_rate(lq_sta->drv, scale_idx, rate_mask,
781 tbl->lq_type);
782 low = high_low & 0xff;
783
784 if (low == RATE_INVALID)
785 low = scale_idx;
786
787 out:
788 return il4965_rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
789 }
790
791 /*
792 * Simple function to compare two rate scale table types
793 */
794 static bool
795 il4965_table_type_matches(struct il_scale_tbl_info *a,
796 struct il_scale_tbl_info *b)
797 {
798 return (a->lq_type == b->lq_type && a->ant_type == b->ant_type &&
799 a->is_SGI == b->is_SGI);
800 }
801
802 /*
803 * mac80211 sends us Tx status
804 */
805 static void
806 il4965_rs_tx_status(void *il_r, struct ieee80211_supported_band *sband,
807 struct ieee80211_sta *sta, void *il_sta,
808 struct sk_buff *skb)
809 {
810 int legacy_success;
811 int retries;
812 int rs_idx, mac_idx, i;
813 struct il_lq_sta *lq_sta = il_sta;
814 struct il_link_quality_cmd *table;
815 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
816 struct il_priv *il = (struct il_priv *)il_r;
817 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
818 enum mac80211_rate_control_flags mac_flags;
819 u32 tx_rate;
820 struct il_scale_tbl_info tbl_type;
821 struct il_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
822
823 D_RATE("get frame ack response, update rate scale win\n");
824
825 /* Treat uninitialized rate scaling data same as non-existing. */
826 if (!lq_sta) {
827 D_RATE("Station rate scaling not created yet.\n");
828 return;
829 } else if (!lq_sta->drv) {
830 D_RATE("Rate scaling not initialized yet.\n");
831 return;
832 }
833
834 if (!ieee80211_is_data(hdr->frame_control) ||
835 (info->flags & IEEE80211_TX_CTL_NO_ACK))
836 return;
837
838 /* This packet was aggregated but doesn't carry status info */
839 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
840 !(info->flags & IEEE80211_TX_STAT_AMPDU))
841 return;
842
843 /*
844 * Ignore this Tx frame response if its initial rate doesn't match
845 * that of latest Link Quality command. There may be stragglers
846 * from a previous Link Quality command, but we're no longer interested
847 * in those; they're either from the "active" mode while we're trying
848 * to check "search" mode, or a prior "search" mode after we've moved
849 * to a new "search" mode (which might become the new "active" mode).
850 */
851 table = &lq_sta->lq;
852 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
853 il4965_rs_get_tbl_info_from_mcs(tx_rate, il->band, &tbl_type, &rs_idx);
854 if (il->band == NL80211_BAND_5GHZ)
855 rs_idx -= IL_FIRST_OFDM_RATE;
856 mac_flags = info->status.rates[0].flags;
857 mac_idx = info->status.rates[0].idx;
858 /* For HT packets, map MCS to PLCP */
859 if (mac_flags & IEEE80211_TX_RC_MCS) {
860 mac_idx &= RATE_MCS_CODE_MSK; /* Remove # of streams */
861 if (mac_idx >= (RATE_9M_IDX - IL_FIRST_OFDM_RATE))
862 mac_idx++;
863 /*
864 * mac80211 HT idx is always zero-idxed; we need to move
865 * HT OFDM rates after CCK rates in 2.4 GHz band
866 */
867 if (il->band == NL80211_BAND_2GHZ)
868 mac_idx += IL_FIRST_OFDM_RATE;
869 }
870 /* Here we actually compare this rate to the latest LQ command */
871 if (mac_idx < 0 ||
872 tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI) ||
873 tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH) ||
874 tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA) ||
875 tbl_type.ant_type != info->status.antenna ||
876 !!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)
877 || !!(tx_rate & RATE_MCS_GF_MSK) !=
878 !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD) || rs_idx != mac_idx) {
879 D_RATE("initial rate %d does not match %d (0x%x)\n", mac_idx,
880 rs_idx, tx_rate);
881 /*
882 * Since rates mis-match, the last LQ command may have failed.
883 * After IL_MISSED_RATE_MAX mis-matches, resync the uCode with
884 * ... driver.
885 */
886 lq_sta->missed_rate_counter++;
887 if (lq_sta->missed_rate_counter > IL_MISSED_RATE_MAX) {
888 lq_sta->missed_rate_counter = 0;
889 il_send_lq_cmd(il, &lq_sta->lq, CMD_ASYNC, false);
890 }
891 /* Regardless, ignore this status info for outdated rate */
892 return;
893 } else
894 /* Rate did match, so reset the missed_rate_counter */
895 lq_sta->missed_rate_counter = 0;
896
897 /* Figure out if rate scale algorithm is in active or search table */
898 if (il4965_table_type_matches
899 (&tbl_type, &(lq_sta->lq_info[lq_sta->active_tbl]))) {
900 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
901 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
902 } else
903 if (il4965_table_type_matches
904 (&tbl_type, &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
905 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
906 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
907 } else {
908 D_RATE("Neither active nor search matches tx rate\n");
909 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
910 D_RATE("active- lq:%x, ant:%x, SGI:%d\n", tmp_tbl->lq_type,
911 tmp_tbl->ant_type, tmp_tbl->is_SGI);
912 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
913 D_RATE("search- lq:%x, ant:%x, SGI:%d\n", tmp_tbl->lq_type,
914 tmp_tbl->ant_type, tmp_tbl->is_SGI);
915 D_RATE("actual- lq:%x, ant:%x, SGI:%d\n", tbl_type.lq_type,
916 tbl_type.ant_type, tbl_type.is_SGI);
917 /*
918 * no matching table found, let's by-pass the data collection
919 * and continue to perform rate scale to find the rate table
920 */
921 il4965_rs_stay_in_table(lq_sta, true);
922 goto done;
923 }
924
925 /*
926 * Updating the frame history depends on whether packets were
927 * aggregated.
928 *
929 * For aggregation, all packets were transmitted at the same rate, the
930 * first idx into rate scale table.
931 */
932 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
933 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
934 il4965_rs_get_tbl_info_from_mcs(tx_rate, il->band, &tbl_type,
935 &rs_idx);
936 il4965_rs_collect_tx_data(curr_tbl, rs_idx,
937 info->status.ampdu_len,
938 info->status.ampdu_ack_len);
939
940 /* Update success/fail counts if not searching for new mode */
941 if (lq_sta->stay_in_tbl) {
942 lq_sta->total_success += info->status.ampdu_ack_len;
943 lq_sta->total_failed +=
944 (info->status.ampdu_len -
945 info->status.ampdu_ack_len);
946 }
947 } else {
948 /*
949 * For legacy, update frame history with for each Tx retry.
950 */
951 retries = info->status.rates[0].count - 1;
952 /* HW doesn't send more than 15 retries */
953 retries = min(retries, 15);
954
955 /* The last transmission may have been successful */
956 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
957 /* Collect data for each rate used during failed TX attempts */
958 for (i = 0; i <= retries; ++i) {
959 tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
960 il4965_rs_get_tbl_info_from_mcs(tx_rate, il->band,
961 &tbl_type, &rs_idx);
962 /*
963 * Only collect stats if retried rate is in the same RS
964 * table as active/search.
965 */
966 if (il4965_table_type_matches(&tbl_type, curr_tbl))
967 tmp_tbl = curr_tbl;
968 else if (il4965_table_type_matches
969 (&tbl_type, other_tbl))
970 tmp_tbl = other_tbl;
971 else
972 continue;
973 il4965_rs_collect_tx_data(tmp_tbl, rs_idx, 1,
974 i <
975 retries ? 0 : legacy_success);
976 }
977
978 /* Update success/fail counts if not searching for new mode */
979 if (lq_sta->stay_in_tbl) {
980 lq_sta->total_success += legacy_success;
981 lq_sta->total_failed += retries + (1 - legacy_success);
982 }
983 }
984 /* The last TX rate is cached in lq_sta; it's set in if/else above */
985 lq_sta->last_rate_n_flags = tx_rate;
986 done:
987 /* See if there's a better rate or modulation mode to try. */
988 if (sta->supp_rates[sband->band])
989 il4965_rs_rate_scale_perform(il, skb, sta, lq_sta);
990 }
991
992 /*
993 * Begin a period of staying with a selected modulation mode.
994 * Set "stay_in_tbl" flag to prevent any mode switches.
995 * Set frame tx success limits according to legacy vs. high-throughput,
996 * and reset overall (spanning all rates) tx success history stats.
997 * These control how long we stay using same modulation mode before
998 * searching for a new mode.
999 */
1000 static void
1001 il4965_rs_set_stay_in_table(struct il_priv *il, u8 is_legacy,
1002 struct il_lq_sta *lq_sta)
1003 {
1004 D_RATE("we are staying in the same table\n");
1005 lq_sta->stay_in_tbl = 1; /* only place this gets set */
1006 if (is_legacy) {
1007 lq_sta->table_count_limit = IL_LEGACY_TBL_COUNT;
1008 lq_sta->max_failure_limit = IL_LEGACY_FAILURE_LIMIT;
1009 lq_sta->max_success_limit = IL_LEGACY_SUCCESS_LIMIT;
1010 } else {
1011 lq_sta->table_count_limit = IL_NONE_LEGACY_TBL_COUNT;
1012 lq_sta->max_failure_limit = IL_NONE_LEGACY_FAILURE_LIMIT;
1013 lq_sta->max_success_limit = IL_NONE_LEGACY_SUCCESS_LIMIT;
1014 }
1015 lq_sta->table_count = 0;
1016 lq_sta->total_failed = 0;
1017 lq_sta->total_success = 0;
1018 lq_sta->flush_timer = jiffies;
1019 lq_sta->action_counter = 0;
1020 }
1021
1022 /*
1023 * Find correct throughput table for given mode of modulation
1024 */
1025 static void
1026 il4965_rs_set_expected_tpt_table(struct il_lq_sta *lq_sta,
1027 struct il_scale_tbl_info *tbl)
1028 {
1029 /* Used to choose among HT tables */
1030 s32(*ht_tbl_pointer)[RATE_COUNT];
1031
1032 /* Check for invalid LQ type */
1033 if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1034 tbl->expected_tpt = expected_tpt_legacy;
1035 return;
1036 }
1037
1038 /* Legacy rates have only one table */
1039 if (is_legacy(tbl->lq_type)) {
1040 tbl->expected_tpt = expected_tpt_legacy;
1041 return;
1042 }
1043
1044 /* Choose among many HT tables depending on number of streams
1045 * (SISO/MIMO2), channel width (20/40), SGI, and aggregation
1046 * status */
1047 if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1048 ht_tbl_pointer = expected_tpt_siso20MHz;
1049 else if (is_siso(tbl->lq_type))
1050 ht_tbl_pointer = expected_tpt_siso40MHz;
1051 else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1052 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1053 else /* if (is_mimo2(tbl->lq_type)) <-- must be true */
1054 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1055
1056 if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */
1057 tbl->expected_tpt = ht_tbl_pointer[0];
1058 else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */
1059 tbl->expected_tpt = ht_tbl_pointer[1];
1060 else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */
1061 tbl->expected_tpt = ht_tbl_pointer[2];
1062 else /* AGG+SGI */
1063 tbl->expected_tpt = ht_tbl_pointer[3];
1064 }
1065
1066 /*
1067 * Find starting rate for new "search" high-throughput mode of modulation.
1068 * Goal is to find lowest expected rate (under perfect conditions) that is
1069 * above the current measured throughput of "active" mode, to give new mode
1070 * a fair chance to prove itself without too many challenges.
1071 *
1072 * This gets called when transitioning to more aggressive modulation
1073 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1074 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1075 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1076 * bit rate will typically need to increase, but not if performance was bad.
1077 */
1078 static s32
1079 il4965_rs_get_best_rate(struct il_priv *il, struct il_lq_sta *lq_sta,
1080 struct il_scale_tbl_info *tbl, /* "search" */
1081 u16 rate_mask, s8 idx)
1082 {
1083 /* "active" values */
1084 struct il_scale_tbl_info *active_tbl =
1085 &(lq_sta->lq_info[lq_sta->active_tbl]);
1086 s32 active_sr = active_tbl->win[idx].success_ratio;
1087 s32 active_tpt = active_tbl->expected_tpt[idx];
1088
1089 /* expected "search" throughput */
1090 s32 *tpt_tbl = tbl->expected_tpt;
1091
1092 s32 new_rate, high, low, start_hi;
1093 u16 high_low;
1094 s8 rate = idx;
1095
1096 new_rate = high = low = start_hi = RATE_INVALID;
1097
1098 for (;;) {
1099 high_low =
1100 il4965_rs_get_adjacent_rate(il, rate, rate_mask,
1101 tbl->lq_type);
1102
1103 low = high_low & 0xff;
1104 high = (high_low >> 8) & 0xff;
1105
1106 /*
1107 * Lower the "search" bit rate, to give new "search" mode
1108 * approximately the same throughput as "active" if:
1109 *
1110 * 1) "Active" mode has been working modestly well (but not
1111 * great), and expected "search" throughput (under perfect
1112 * conditions) at candidate rate is above the actual
1113 * measured "active" throughput (but less than expected
1114 * "active" throughput under perfect conditions).
1115 * OR
1116 * 2) "Active" mode has been working perfectly or very well
1117 * and expected "search" throughput (under perfect
1118 * conditions) at candidate rate is above expected
1119 * "active" throughput (under perfect conditions).
1120 */
1121 if ((100 * tpt_tbl[rate] > lq_sta->last_tpt &&
1122 (active_sr > RATE_DECREASE_TH && active_sr <= RATE_HIGH_TH
1123 && tpt_tbl[rate] <= active_tpt)) ||
1124 (active_sr >= RATE_SCALE_SWITCH &&
1125 tpt_tbl[rate] > active_tpt)) {
1126
1127 /* (2nd or later pass)
1128 * If we've already tried to raise the rate, and are
1129 * now trying to lower it, use the higher rate. */
1130 if (start_hi != RATE_INVALID) {
1131 new_rate = start_hi;
1132 break;
1133 }
1134
1135 new_rate = rate;
1136
1137 /* Loop again with lower rate */
1138 if (low != RATE_INVALID)
1139 rate = low;
1140
1141 /* Lower rate not available, use the original */
1142 else
1143 break;
1144
1145 /* Else try to raise the "search" rate to match "active" */
1146 } else {
1147 /* (2nd or later pass)
1148 * If we've already tried to lower the rate, and are
1149 * now trying to raise it, use the lower rate. */
1150 if (new_rate != RATE_INVALID)
1151 break;
1152
1153 /* Loop again with higher rate */
1154 else if (high != RATE_INVALID) {
1155 start_hi = high;
1156 rate = high;
1157
1158 /* Higher rate not available, use the original */
1159 } else {
1160 new_rate = rate;
1161 break;
1162 }
1163 }
1164 }
1165
1166 return new_rate;
1167 }
1168
1169 /*
1170 * Set up search table for MIMO2
1171 */
1172 static int
1173 il4965_rs_switch_to_mimo2(struct il_priv *il, struct il_lq_sta *lq_sta,
1174 struct ieee80211_conf *conf,
1175 struct ieee80211_sta *sta,
1176 struct il_scale_tbl_info *tbl, int idx)
1177 {
1178 u16 rate_mask;
1179 s32 rate;
1180 s8 is_green = lq_sta->is_green;
1181
1182 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1183 return -1;
1184
1185 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
1186 return -1;
1187
1188 /* Need both Tx chains/antennas to support MIMO */
1189 if (il->hw_params.tx_chains_num < 2)
1190 return -1;
1191
1192 D_RATE("LQ: try to switch to MIMO2\n");
1193
1194 tbl->lq_type = LQ_MIMO2;
1195 tbl->is_dup = lq_sta->is_dup;
1196 tbl->action = 0;
1197 tbl->max_search = IL_MAX_SEARCH;
1198 rate_mask = lq_sta->active_mimo2_rate;
1199
1200 if (il_is_ht40_tx_allowed(il, &sta->ht_cap))
1201 tbl->is_ht40 = 1;
1202 else
1203 tbl->is_ht40 = 0;
1204
1205 il4965_rs_set_expected_tpt_table(lq_sta, tbl);
1206
1207 rate = il4965_rs_get_best_rate(il, lq_sta, tbl, rate_mask, idx);
1208
1209 D_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1210 if (rate == RATE_INVALID || !((1 << rate) & rate_mask)) {
1211 D_RATE("Can't switch with idx %d rate mask %x\n", rate,
1212 rate_mask);
1213 return -1;
1214 }
1215 tbl->current_rate =
1216 il4965_rate_n_flags_from_tbl(il, tbl, rate, is_green);
1217
1218 D_RATE("LQ: Switch to new mcs %X idx is green %X\n", tbl->current_rate,
1219 is_green);
1220 return 0;
1221 }
1222
1223 /*
1224 * Set up search table for SISO
1225 */
1226 static int
1227 il4965_rs_switch_to_siso(struct il_priv *il, struct il_lq_sta *lq_sta,
1228 struct ieee80211_conf *conf, struct ieee80211_sta *sta,
1229 struct il_scale_tbl_info *tbl, int idx)
1230 {
1231 u16 rate_mask;
1232 u8 is_green = lq_sta->is_green;
1233 s32 rate;
1234
1235 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1236 return -1;
1237
1238 D_RATE("LQ: try to switch to SISO\n");
1239
1240 tbl->is_dup = lq_sta->is_dup;
1241 tbl->lq_type = LQ_SISO;
1242 tbl->action = 0;
1243 tbl->max_search = IL_MAX_SEARCH;
1244 rate_mask = lq_sta->active_siso_rate;
1245
1246 if (il_is_ht40_tx_allowed(il, &sta->ht_cap))
1247 tbl->is_ht40 = 1;
1248 else
1249 tbl->is_ht40 = 0;
1250
1251 if (is_green)
1252 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield */
1253
1254 il4965_rs_set_expected_tpt_table(lq_sta, tbl);
1255 rate = il4965_rs_get_best_rate(il, lq_sta, tbl, rate_mask, idx);
1256
1257 D_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask);
1258 if (rate == RATE_INVALID || !((1 << rate) & rate_mask)) {
1259 D_RATE("can not switch with idx %d rate mask %x\n", rate,
1260 rate_mask);
1261 return -1;
1262 }
1263 tbl->current_rate =
1264 il4965_rate_n_flags_from_tbl(il, tbl, rate, is_green);
1265 D_RATE("LQ: Switch to new mcs %X idx is green %X\n", tbl->current_rate,
1266 is_green);
1267 return 0;
1268 }
1269
1270 /*
1271 * Try to switch to new modulation mode from legacy
1272 */
1273 static int
1274 il4965_rs_move_legacy_other(struct il_priv *il, struct il_lq_sta *lq_sta,
1275 struct ieee80211_conf *conf,
1276 struct ieee80211_sta *sta, int idx)
1277 {
1278 struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1279 struct il_scale_tbl_info *search_tbl =
1280 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1281 struct il_rate_scale_data *win = &(tbl->win[idx]);
1282 u32 sz =
1283 (sizeof(struct il_scale_tbl_info) -
1284 (sizeof(struct il_rate_scale_data) * RATE_COUNT));
1285 u8 start_action;
1286 u8 valid_tx_ant = il->hw_params.valid_tx_ant;
1287 u8 tx_chains_num = il->hw_params.tx_chains_num;
1288 int ret = 0;
1289 u8 update_search_tbl_counter = 0;
1290
1291 tbl->action = IL_LEGACY_SWITCH_SISO;
1292
1293 start_action = tbl->action;
1294 for (;;) {
1295 lq_sta->action_counter++;
1296 switch (tbl->action) {
1297 case IL_LEGACY_SWITCH_ANTENNA1:
1298 case IL_LEGACY_SWITCH_ANTENNA2:
1299 D_RATE("LQ: Legacy toggle Antenna\n");
1300
1301 if ((tbl->action == IL_LEGACY_SWITCH_ANTENNA1 &&
1302 tx_chains_num <= 1) ||
1303 (tbl->action == IL_LEGACY_SWITCH_ANTENNA2 &&
1304 tx_chains_num <= 2))
1305 break;
1306
1307 /* Don't change antenna if success has been great */
1308 if (win->success_ratio >= IL_RS_GOOD_RATIO)
1309 break;
1310
1311 /* Set up search table to try other antenna */
1312 memcpy(search_tbl, tbl, sz);
1313
1314 if (il4965_rs_toggle_antenna
1315 (valid_tx_ant, &search_tbl->current_rate,
1316 search_tbl)) {
1317 update_search_tbl_counter = 1;
1318 il4965_rs_set_expected_tpt_table(lq_sta,
1319 search_tbl);
1320 goto out;
1321 }
1322 break;
1323 case IL_LEGACY_SWITCH_SISO:
1324 D_RATE("LQ: Legacy switch to SISO\n");
1325
1326 /* Set up search table to try SISO */
1327 memcpy(search_tbl, tbl, sz);
1328 search_tbl->is_SGI = 0;
1329 ret =
1330 il4965_rs_switch_to_siso(il, lq_sta, conf, sta,
1331 search_tbl, idx);
1332 if (!ret) {
1333 lq_sta->action_counter = 0;
1334 goto out;
1335 }
1336
1337 break;
1338 case IL_LEGACY_SWITCH_MIMO2_AB:
1339 case IL_LEGACY_SWITCH_MIMO2_AC:
1340 case IL_LEGACY_SWITCH_MIMO2_BC:
1341 D_RATE("LQ: Legacy switch to MIMO2\n");
1342
1343 /* Set up search table to try MIMO */
1344 memcpy(search_tbl, tbl, sz);
1345 search_tbl->is_SGI = 0;
1346
1347 if (tbl->action == IL_LEGACY_SWITCH_MIMO2_AB)
1348 search_tbl->ant_type = ANT_AB;
1349 else if (tbl->action == IL_LEGACY_SWITCH_MIMO2_AC)
1350 search_tbl->ant_type = ANT_AC;
1351 else
1352 search_tbl->ant_type = ANT_BC;
1353
1354 if (!il4965_rs_is_valid_ant
1355 (valid_tx_ant, search_tbl->ant_type))
1356 break;
1357
1358 ret =
1359 il4965_rs_switch_to_mimo2(il, lq_sta, conf, sta,
1360 search_tbl, idx);
1361 if (!ret) {
1362 lq_sta->action_counter = 0;
1363 goto out;
1364 }
1365 break;
1366 }
1367 tbl->action++;
1368 if (tbl->action > IL_LEGACY_SWITCH_MIMO2_BC)
1369 tbl->action = IL_LEGACY_SWITCH_ANTENNA1;
1370
1371 if (tbl->action == start_action)
1372 break;
1373
1374 }
1375 search_tbl->lq_type = LQ_NONE;
1376 return 0;
1377
1378 out:
1379 lq_sta->search_better_tbl = 1;
1380 tbl->action++;
1381 if (tbl->action > IL_LEGACY_SWITCH_MIMO2_BC)
1382 tbl->action = IL_LEGACY_SWITCH_ANTENNA1;
1383 if (update_search_tbl_counter)
1384 search_tbl->action = tbl->action;
1385 return 0;
1386
1387 }
1388
1389 /*
1390 * Try to switch to new modulation mode from SISO
1391 */
1392 static int
1393 il4965_rs_move_siso_to_other(struct il_priv *il, struct il_lq_sta *lq_sta,
1394 struct ieee80211_conf *conf,
1395 struct ieee80211_sta *sta, int idx)
1396 {
1397 u8 is_green = lq_sta->is_green;
1398 struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1399 struct il_scale_tbl_info *search_tbl =
1400 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1401 struct il_rate_scale_data *win = &(tbl->win[idx]);
1402 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1403 u32 sz =
1404 (sizeof(struct il_scale_tbl_info) -
1405 (sizeof(struct il_rate_scale_data) * RATE_COUNT));
1406 u8 start_action;
1407 u8 valid_tx_ant = il->hw_params.valid_tx_ant;
1408 u8 tx_chains_num = il->hw_params.tx_chains_num;
1409 u8 update_search_tbl_counter = 0;
1410 int ret;
1411
1412 start_action = tbl->action;
1413
1414 for (;;) {
1415 lq_sta->action_counter++;
1416 switch (tbl->action) {
1417 case IL_SISO_SWITCH_ANTENNA1:
1418 case IL_SISO_SWITCH_ANTENNA2:
1419 D_RATE("LQ: SISO toggle Antenna\n");
1420 if ((tbl->action == IL_SISO_SWITCH_ANTENNA1 &&
1421 tx_chains_num <= 1) ||
1422 (tbl->action == IL_SISO_SWITCH_ANTENNA2 &&
1423 tx_chains_num <= 2))
1424 break;
1425
1426 if (win->success_ratio >= IL_RS_GOOD_RATIO)
1427 break;
1428
1429 memcpy(search_tbl, tbl, sz);
1430 if (il4965_rs_toggle_antenna
1431 (valid_tx_ant, &search_tbl->current_rate,
1432 search_tbl)) {
1433 update_search_tbl_counter = 1;
1434 goto out;
1435 }
1436 break;
1437 case IL_SISO_SWITCH_MIMO2_AB:
1438 case IL_SISO_SWITCH_MIMO2_AC:
1439 case IL_SISO_SWITCH_MIMO2_BC:
1440 D_RATE("LQ: SISO switch to MIMO2\n");
1441 memcpy(search_tbl, tbl, sz);
1442 search_tbl->is_SGI = 0;
1443
1444 if (tbl->action == IL_SISO_SWITCH_MIMO2_AB)
1445 search_tbl->ant_type = ANT_AB;
1446 else if (tbl->action == IL_SISO_SWITCH_MIMO2_AC)
1447 search_tbl->ant_type = ANT_AC;
1448 else
1449 search_tbl->ant_type = ANT_BC;
1450
1451 if (!il4965_rs_is_valid_ant
1452 (valid_tx_ant, search_tbl->ant_type))
1453 break;
1454
1455 ret =
1456 il4965_rs_switch_to_mimo2(il, lq_sta, conf, sta,
1457 search_tbl, idx);
1458 if (!ret)
1459 goto out;
1460 break;
1461 case IL_SISO_SWITCH_GI:
1462 if (!tbl->is_ht40 &&
1463 !(ht_cap->cap & IEEE80211_HT_CAP_SGI_20))
1464 break;
1465 if (tbl->is_ht40 &&
1466 !(ht_cap->cap & IEEE80211_HT_CAP_SGI_40))
1467 break;
1468
1469 D_RATE("LQ: SISO toggle SGI/NGI\n");
1470
1471 memcpy(search_tbl, tbl, sz);
1472 if (is_green) {
1473 if (!tbl->is_SGI)
1474 break;
1475 else
1476 IL_ERR("SGI was set in GF+SISO\n");
1477 }
1478 search_tbl->is_SGI = !tbl->is_SGI;
1479 il4965_rs_set_expected_tpt_table(lq_sta, search_tbl);
1480 if (tbl->is_SGI) {
1481 s32 tpt = lq_sta->last_tpt / 100;
1482 if (tpt >= search_tbl->expected_tpt[idx])
1483 break;
1484 }
1485 search_tbl->current_rate =
1486 il4965_rate_n_flags_from_tbl(il, search_tbl, idx,
1487 is_green);
1488 update_search_tbl_counter = 1;
1489 goto out;
1490 }
1491 tbl->action++;
1492 if (tbl->action > IL_SISO_SWITCH_GI)
1493 tbl->action = IL_SISO_SWITCH_ANTENNA1;
1494
1495 if (tbl->action == start_action)
1496 break;
1497 }
1498 search_tbl->lq_type = LQ_NONE;
1499 return 0;
1500
1501 out:
1502 lq_sta->search_better_tbl = 1;
1503 tbl->action++;
1504 if (tbl->action > IL_SISO_SWITCH_GI)
1505 tbl->action = IL_SISO_SWITCH_ANTENNA1;
1506 if (update_search_tbl_counter)
1507 search_tbl->action = tbl->action;
1508
1509 return 0;
1510 }
1511
1512 /*
1513 * Try to switch to new modulation mode from MIMO2
1514 */
1515 static int
1516 il4965_rs_move_mimo2_to_other(struct il_priv *il, struct il_lq_sta *lq_sta,
1517 struct ieee80211_conf *conf,
1518 struct ieee80211_sta *sta, int idx)
1519 {
1520 s8 is_green = lq_sta->is_green;
1521 struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1522 struct il_scale_tbl_info *search_tbl =
1523 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1524 struct il_rate_scale_data *win = &(tbl->win[idx]);
1525 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1526 u32 sz =
1527 (sizeof(struct il_scale_tbl_info) -
1528 (sizeof(struct il_rate_scale_data) * RATE_COUNT));
1529 u8 start_action;
1530 u8 valid_tx_ant = il->hw_params.valid_tx_ant;
1531 u8 tx_chains_num = il->hw_params.tx_chains_num;
1532 u8 update_search_tbl_counter = 0;
1533 int ret;
1534
1535 start_action = tbl->action;
1536 for (;;) {
1537 lq_sta->action_counter++;
1538 switch (tbl->action) {
1539 case IL_MIMO2_SWITCH_ANTENNA1:
1540 case IL_MIMO2_SWITCH_ANTENNA2:
1541 D_RATE("LQ: MIMO2 toggle Antennas\n");
1542
1543 if (tx_chains_num <= 2)
1544 break;
1545
1546 if (win->success_ratio >= IL_RS_GOOD_RATIO)
1547 break;
1548
1549 memcpy(search_tbl, tbl, sz);
1550 if (il4965_rs_toggle_antenna
1551 (valid_tx_ant, &search_tbl->current_rate,
1552 search_tbl)) {
1553 update_search_tbl_counter = 1;
1554 goto out;
1555 }
1556 break;
1557 case IL_MIMO2_SWITCH_SISO_A:
1558 case IL_MIMO2_SWITCH_SISO_B:
1559 case IL_MIMO2_SWITCH_SISO_C:
1560 D_RATE("LQ: MIMO2 switch to SISO\n");
1561
1562 /* Set up new search table for SISO */
1563 memcpy(search_tbl, tbl, sz);
1564
1565 if (tbl->action == IL_MIMO2_SWITCH_SISO_A)
1566 search_tbl->ant_type = ANT_A;
1567 else if (tbl->action == IL_MIMO2_SWITCH_SISO_B)
1568 search_tbl->ant_type = ANT_B;
1569 else
1570 search_tbl->ant_type = ANT_C;
1571
1572 if (!il4965_rs_is_valid_ant
1573 (valid_tx_ant, search_tbl->ant_type))
1574 break;
1575
1576 ret =
1577 il4965_rs_switch_to_siso(il, lq_sta, conf, sta,
1578 search_tbl, idx);
1579 if (!ret)
1580 goto out;
1581
1582 break;
1583
1584 case IL_MIMO2_SWITCH_GI:
1585 if (!tbl->is_ht40 &&
1586 !(ht_cap->cap & IEEE80211_HT_CAP_SGI_20))
1587 break;
1588 if (tbl->is_ht40 &&
1589 !(ht_cap->cap & IEEE80211_HT_CAP_SGI_40))
1590 break;
1591
1592 D_RATE("LQ: MIMO2 toggle SGI/NGI\n");
1593
1594 /* Set up new search table for MIMO2 */
1595 memcpy(search_tbl, tbl, sz);
1596 search_tbl->is_SGI = !tbl->is_SGI;
1597 il4965_rs_set_expected_tpt_table(lq_sta, search_tbl);
1598 /*
1599 * If active table already uses the fastest possible
1600 * modulation (dual stream with short guard interval),
1601 * and it's working well, there's no need to look
1602 * for a better type of modulation!
1603 */
1604 if (tbl->is_SGI) {
1605 s32 tpt = lq_sta->last_tpt / 100;
1606 if (tpt >= search_tbl->expected_tpt[idx])
1607 break;
1608 }
1609 search_tbl->current_rate =
1610 il4965_rate_n_flags_from_tbl(il, search_tbl, idx,
1611 is_green);
1612 update_search_tbl_counter = 1;
1613 goto out;
1614
1615 }
1616 tbl->action++;
1617 if (tbl->action > IL_MIMO2_SWITCH_GI)
1618 tbl->action = IL_MIMO2_SWITCH_ANTENNA1;
1619
1620 if (tbl->action == start_action)
1621 break;
1622 }
1623 search_tbl->lq_type = LQ_NONE;
1624 return 0;
1625 out:
1626 lq_sta->search_better_tbl = 1;
1627 tbl->action++;
1628 if (tbl->action > IL_MIMO2_SWITCH_GI)
1629 tbl->action = IL_MIMO2_SWITCH_ANTENNA1;
1630 if (update_search_tbl_counter)
1631 search_tbl->action = tbl->action;
1632
1633 return 0;
1634
1635 }
1636
1637 /*
1638 * Check whether we should continue using same modulation mode, or
1639 * begin search for a new mode, based on:
1640 * 1) # tx successes or failures while using this mode
1641 * 2) # times calling this function
1642 * 3) elapsed time in this mode (not used, for now)
1643 */
1644 static void
1645 il4965_rs_stay_in_table(struct il_lq_sta *lq_sta, bool force_search)
1646 {
1647 struct il_scale_tbl_info *tbl;
1648 int i;
1649 int active_tbl;
1650 int flush_interval_passed = 0;
1651 struct il_priv *il;
1652
1653 il = lq_sta->drv;
1654 active_tbl = lq_sta->active_tbl;
1655
1656 tbl = &(lq_sta->lq_info[active_tbl]);
1657
1658 /* If we've been disallowing search, see if we should now allow it */
1659 if (lq_sta->stay_in_tbl) {
1660
1661 /* Elapsed time using current modulation mode */
1662 if (lq_sta->flush_timer)
1663 flush_interval_passed =
1664 time_after(jiffies,
1665 (unsigned long)(lq_sta->flush_timer +
1666 RATE_SCALE_FLUSH_INTVL));
1667
1668 /*
1669 * Check if we should allow search for new modulation mode.
1670 * If many frames have failed or succeeded, or we've used
1671 * this same modulation for a long time, allow search, and
1672 * reset history stats that keep track of whether we should
1673 * allow a new search. Also (below) reset all bitmaps and
1674 * stats in active history.
1675 */
1676 if (force_search ||
1677 lq_sta->total_failed > lq_sta->max_failure_limit ||
1678 lq_sta->total_success > lq_sta->max_success_limit ||
1679 (!lq_sta->search_better_tbl && lq_sta->flush_timer &&
1680 flush_interval_passed)) {
1681 D_RATE("LQ: stay is expired %d %d %d\n",
1682 lq_sta->total_failed, lq_sta->total_success,
1683 flush_interval_passed);
1684
1685 /* Allow search for new mode */
1686 lq_sta->stay_in_tbl = 0; /* only place reset */
1687 lq_sta->total_failed = 0;
1688 lq_sta->total_success = 0;
1689 lq_sta->flush_timer = 0;
1690
1691 /*
1692 * Else if we've used this modulation mode enough repetitions
1693 * (regardless of elapsed time or success/failure), reset
1694 * history bitmaps and rate-specific stats for all rates in
1695 * active table.
1696 */
1697 } else {
1698 lq_sta->table_count++;
1699 if (lq_sta->table_count >= lq_sta->table_count_limit) {
1700 lq_sta->table_count = 0;
1701
1702 D_RATE("LQ: stay in table clear win\n");
1703 for (i = 0; i < RATE_COUNT; i++)
1704 il4965_rs_rate_scale_clear_win(&
1705 (tbl->
1706 win
1707 [i]));
1708 }
1709 }
1710
1711 /* If transitioning to allow "search", reset all history
1712 * bitmaps and stats in active table (this will become the new
1713 * "search" table). */
1714 if (!lq_sta->stay_in_tbl) {
1715 for (i = 0; i < RATE_COUNT; i++)
1716 il4965_rs_rate_scale_clear_win(&(tbl->win[i]));
1717 }
1718 }
1719 }
1720
1721 /*
1722 * setup rate table in uCode
1723 */
1724 static void
1725 il4965_rs_update_rate_tbl(struct il_priv *il, struct il_lq_sta *lq_sta,
1726 struct il_scale_tbl_info *tbl, int idx, u8 is_green)
1727 {
1728 u32 rate;
1729
1730 /* Update uCode's rate table. */
1731 rate = il4965_rate_n_flags_from_tbl(il, tbl, idx, is_green);
1732 il4965_rs_fill_link_cmd(il, lq_sta, rate);
1733 il_send_lq_cmd(il, &lq_sta->lq, CMD_ASYNC, false);
1734 }
1735
1736 /*
1737 * Do rate scaling and search for new modulation mode.
1738 */
1739 static void
1740 il4965_rs_rate_scale_perform(struct il_priv *il, struct sk_buff *skb,
1741 struct ieee80211_sta *sta,
1742 struct il_lq_sta *lq_sta)
1743 {
1744 struct ieee80211_hw *hw = il->hw;
1745 struct ieee80211_conf *conf = &hw->conf;
1746 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1747 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1748 int low = RATE_INVALID;
1749 int high = RATE_INVALID;
1750 int idx;
1751 int i;
1752 struct il_rate_scale_data *win = NULL;
1753 int current_tpt = IL_INVALID_VALUE;
1754 int low_tpt = IL_INVALID_VALUE;
1755 int high_tpt = IL_INVALID_VALUE;
1756 u32 fail_count;
1757 s8 scale_action = 0;
1758 u16 rate_mask;
1759 u8 update_lq = 0;
1760 struct il_scale_tbl_info *tbl, *tbl1;
1761 u16 rate_scale_idx_msk = 0;
1762 u8 is_green = 0;
1763 u8 active_tbl = 0;
1764 u8 done_search = 0;
1765 u16 high_low;
1766 s32 sr;
1767 u8 tid = MAX_TID_COUNT;
1768 struct il_tid_data *tid_data;
1769
1770 D_RATE("rate scale calculate new rate for skb\n");
1771
1772 /* Send management frames and NO_ACK data using lowest rate. */
1773 /* TODO: this could probably be improved.. */
1774 if (!ieee80211_is_data(hdr->frame_control) ||
1775 (info->flags & IEEE80211_TX_CTL_NO_ACK))
1776 return;
1777
1778 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
1779
1780 tid = il4965_rs_tl_add_packet(lq_sta, hdr);
1781 if (tid != MAX_TID_COUNT && (lq_sta->tx_agg_tid_en & (1 << tid))) {
1782 tid_data = &il->stations[lq_sta->lq.sta_id].tid[tid];
1783 if (tid_data->agg.state == IL_AGG_OFF)
1784 lq_sta->is_agg = 0;
1785 else
1786 lq_sta->is_agg = 1;
1787 } else
1788 lq_sta->is_agg = 0;
1789
1790 /*
1791 * Select rate-scale / modulation-mode table to work with in
1792 * the rest of this function: "search" if searching for better
1793 * modulation mode, or "active" if doing rate scaling within a mode.
1794 */
1795 if (!lq_sta->search_better_tbl)
1796 active_tbl = lq_sta->active_tbl;
1797 else
1798 active_tbl = 1 - lq_sta->active_tbl;
1799
1800 tbl = &(lq_sta->lq_info[active_tbl]);
1801 if (is_legacy(tbl->lq_type))
1802 lq_sta->is_green = 0;
1803 else
1804 lq_sta->is_green = il4965_rs_use_green(il, sta);
1805 is_green = lq_sta->is_green;
1806
1807 /* current tx rate */
1808 idx = lq_sta->last_txrate_idx;
1809
1810 D_RATE("Rate scale idx %d for type %d\n", idx, tbl->lq_type);
1811
1812 /* rates available for this association, and for modulation mode */
1813 rate_mask = il4965_rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
1814
1815 D_RATE("mask 0x%04X\n", rate_mask);
1816
1817 /* mask with station rate restriction */
1818 if (is_legacy(tbl->lq_type)) {
1819 if (lq_sta->band == NL80211_BAND_5GHZ)
1820 /* supp_rates has no CCK bits in A mode */
1821 rate_scale_idx_msk =
1822 (u16) (rate_mask &
1823 (lq_sta->supp_rates << IL_FIRST_OFDM_RATE));
1824 else
1825 rate_scale_idx_msk =
1826 (u16) (rate_mask & lq_sta->supp_rates);
1827
1828 } else
1829 rate_scale_idx_msk = rate_mask;
1830
1831 if (!rate_scale_idx_msk)
1832 rate_scale_idx_msk = rate_mask;
1833
1834 if (!((1 << idx) & rate_scale_idx_msk)) {
1835 IL_ERR("Current Rate is not valid\n");
1836 if (lq_sta->search_better_tbl) {
1837 /* revert to active table if search table is not valid */
1838 tbl->lq_type = LQ_NONE;
1839 lq_sta->search_better_tbl = 0;
1840 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1841 /* get "active" rate info */
1842 idx = il4965_hwrate_to_plcp_idx(tbl->current_rate);
1843 il4965_rs_update_rate_tbl(il, lq_sta, tbl, idx,
1844 is_green);
1845 }
1846 return;
1847 }
1848
1849 /* Get expected throughput table and history win for current rate */
1850 if (!tbl->expected_tpt) {
1851 IL_ERR("tbl->expected_tpt is NULL\n");
1852 return;
1853 }
1854
1855 /* force user max rate if set by user */
1856 if (lq_sta->max_rate_idx != -1 && lq_sta->max_rate_idx < idx) {
1857 idx = lq_sta->max_rate_idx;
1858 update_lq = 1;
1859 win = &(tbl->win[idx]);
1860 goto lq_update;
1861 }
1862
1863 win = &(tbl->win[idx]);
1864
1865 /*
1866 * If there is not enough history to calculate actual average
1867 * throughput, keep analyzing results of more tx frames, without
1868 * changing rate or mode (bypass most of the rest of this function).
1869 * Set up new rate table in uCode only if old rate is not supported
1870 * in current association (use new rate found above).
1871 */
1872 fail_count = win->counter - win->success_counter;
1873 if (fail_count < RATE_MIN_FAILURE_TH &&
1874 win->success_counter < RATE_MIN_SUCCESS_TH) {
1875 D_RATE("LQ: still below TH. succ=%d total=%d " "for idx %d\n",
1876 win->success_counter, win->counter, idx);
1877
1878 /* Can't calculate this yet; not enough history */
1879 win->average_tpt = IL_INVALID_VALUE;
1880
1881 /* Should we stay with this modulation mode,
1882 * or search for a new one? */
1883 il4965_rs_stay_in_table(lq_sta, false);
1884
1885 goto out;
1886 }
1887 /* Else we have enough samples; calculate estimate of
1888 * actual average throughput */
1889 if (win->average_tpt !=
1890 ((win->success_ratio * tbl->expected_tpt[idx] + 64) / 128)) {
1891 IL_ERR("expected_tpt should have been calculated by now\n");
1892 win->average_tpt =
1893 ((win->success_ratio * tbl->expected_tpt[idx] + 64) / 128);
1894 }
1895
1896 /* If we are searching for better modulation mode, check success. */
1897 if (lq_sta->search_better_tbl) {
1898 /* If good success, continue using the "search" mode;
1899 * no need to send new link quality command, since we're
1900 * continuing to use the setup that we've been trying. */
1901 if (win->average_tpt > lq_sta->last_tpt) {
1902
1903 D_RATE("LQ: SWITCHING TO NEW TBL "
1904 "suc=%d cur-tpt=%d old-tpt=%d\n",
1905 win->success_ratio, win->average_tpt,
1906 lq_sta->last_tpt);
1907
1908 if (!is_legacy(tbl->lq_type))
1909 lq_sta->enable_counter = 1;
1910
1911 /* Swap tables; "search" becomes "active" */
1912 lq_sta->active_tbl = active_tbl;
1913 current_tpt = win->average_tpt;
1914
1915 /* Else poor success; go back to mode in "active" table */
1916 } else {
1917
1918 D_RATE("LQ: GOING BACK TO THE OLD TBL "
1919 "suc=%d cur-tpt=%d old-tpt=%d\n",
1920 win->success_ratio, win->average_tpt,
1921 lq_sta->last_tpt);
1922
1923 /* Nullify "search" table */
1924 tbl->lq_type = LQ_NONE;
1925
1926 /* Revert to "active" table */
1927 active_tbl = lq_sta->active_tbl;
1928 tbl = &(lq_sta->lq_info[active_tbl]);
1929
1930 /* Revert to "active" rate and throughput info */
1931 idx = il4965_hwrate_to_plcp_idx(tbl->current_rate);
1932 current_tpt = lq_sta->last_tpt;
1933
1934 /* Need to set up a new rate table in uCode */
1935 update_lq = 1;
1936 }
1937
1938 /* Either way, we've made a decision; modulation mode
1939 * search is done, allow rate adjustment next time. */
1940 lq_sta->search_better_tbl = 0;
1941 done_search = 1; /* Don't switch modes below! */
1942 goto lq_update;
1943 }
1944
1945 /* (Else) not in search of better modulation mode, try for better
1946 * starting rate, while staying in this mode. */
1947 high_low =
1948 il4965_rs_get_adjacent_rate(il, idx, rate_scale_idx_msk,
1949 tbl->lq_type);
1950 low = high_low & 0xff;
1951 high = (high_low >> 8) & 0xff;
1952
1953 /* If user set max rate, dont allow higher than user constrain */
1954 if (lq_sta->max_rate_idx != -1 && lq_sta->max_rate_idx < high)
1955 high = RATE_INVALID;
1956
1957 sr = win->success_ratio;
1958
1959 /* Collect measured throughputs for current and adjacent rates */
1960 current_tpt = win->average_tpt;
1961 if (low != RATE_INVALID)
1962 low_tpt = tbl->win[low].average_tpt;
1963 if (high != RATE_INVALID)
1964 high_tpt = tbl->win[high].average_tpt;
1965
1966 scale_action = 0;
1967
1968 /* Too many failures, decrease rate */
1969 if (sr <= RATE_DECREASE_TH || current_tpt == 0) {
1970 D_RATE("decrease rate because of low success_ratio\n");
1971 scale_action = -1;
1972
1973 /* No throughput measured yet for adjacent rates; try increase. */
1974 } else if (low_tpt == IL_INVALID_VALUE && high_tpt == IL_INVALID_VALUE) {
1975
1976 if (high != RATE_INVALID && sr >= RATE_INCREASE_TH)
1977 scale_action = 1;
1978 else if (low != RATE_INVALID)
1979 scale_action = 0;
1980 }
1981
1982 /* Both adjacent throughputs are measured, but neither one has better
1983 * throughput; we're using the best rate, don't change it! */
1984 else if (low_tpt != IL_INVALID_VALUE && high_tpt != IL_INVALID_VALUE &&
1985 low_tpt < current_tpt && high_tpt < current_tpt)
1986 scale_action = 0;
1987
1988 /* At least one adjacent rate's throughput is measured,
1989 * and may have better performance. */
1990 else {
1991 /* Higher adjacent rate's throughput is measured */
1992 if (high_tpt != IL_INVALID_VALUE) {
1993 /* Higher rate has better throughput */
1994 if (high_tpt > current_tpt && sr >= RATE_INCREASE_TH)
1995 scale_action = 1;
1996 else
1997 scale_action = 0;
1998
1999 /* Lower adjacent rate's throughput is measured */
2000 } else if (low_tpt != IL_INVALID_VALUE) {
2001 /* Lower rate has better throughput */
2002 if (low_tpt > current_tpt) {
2003 D_RATE("decrease rate because of low tpt\n");
2004 scale_action = -1;
2005 } else if (sr >= RATE_INCREASE_TH) {
2006 scale_action = 1;
2007 }
2008 }
2009 }
2010
2011 /* Sanity check; asked for decrease, but success rate or throughput
2012 * has been good at old rate. Don't change it. */
2013 if (scale_action == -1 && low != RATE_INVALID &&
2014 (sr > RATE_HIGH_TH || current_tpt > 100 * tbl->expected_tpt[low]))
2015 scale_action = 0;
2016
2017 switch (scale_action) {
2018 case -1:
2019 /* Decrease starting rate, update uCode's rate table */
2020 if (low != RATE_INVALID) {
2021 update_lq = 1;
2022 idx = low;
2023 }
2024
2025 break;
2026 case 1:
2027 /* Increase starting rate, update uCode's rate table */
2028 if (high != RATE_INVALID) {
2029 update_lq = 1;
2030 idx = high;
2031 }
2032
2033 break;
2034 case 0:
2035 /* No change */
2036 default:
2037 break;
2038 }
2039
2040 D_RATE("choose rate scale idx %d action %d low %d " "high %d type %d\n",
2041 idx, scale_action, low, high, tbl->lq_type);
2042
2043 lq_update:
2044 /* Replace uCode's rate table for the destination station. */
2045 if (update_lq)
2046 il4965_rs_update_rate_tbl(il, lq_sta, tbl, idx, is_green);
2047
2048 /* Should we stay with this modulation mode,
2049 * or search for a new one? */
2050 il4965_rs_stay_in_table(lq_sta, false);
2051
2052 /*
2053 * Search for new modulation mode if we're:
2054 * 1) Not changing rates right now
2055 * 2) Not just finishing up a search
2056 * 3) Allowing a new search
2057 */
2058 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && win->counter) {
2059 /* Save current throughput to compare with "search" throughput */
2060 lq_sta->last_tpt = current_tpt;
2061
2062 /* Select a new "search" modulation mode to try.
2063 * If one is found, set up the new "search" table. */
2064 if (is_legacy(tbl->lq_type))
2065 il4965_rs_move_legacy_other(il, lq_sta, conf, sta, idx);
2066 else if (is_siso(tbl->lq_type))
2067 il4965_rs_move_siso_to_other(il, lq_sta, conf, sta,
2068 idx);
2069 else /* (is_mimo2(tbl->lq_type)) */
2070 il4965_rs_move_mimo2_to_other(il, lq_sta, conf, sta,
2071 idx);
2072
2073 /* If new "search" mode was selected, set up in uCode table */
2074 if (lq_sta->search_better_tbl) {
2075 /* Access the "search" table, clear its history. */
2076 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2077 for (i = 0; i < RATE_COUNT; i++)
2078 il4965_rs_rate_scale_clear_win(&(tbl->win[i]));
2079
2080 /* Use new "search" start rate */
2081 idx = il4965_hwrate_to_plcp_idx(tbl->current_rate);
2082
2083 D_RATE("Switch current mcs: %X idx: %d\n",
2084 tbl->current_rate, idx);
2085 il4965_rs_fill_link_cmd(il, lq_sta, tbl->current_rate);
2086 il_send_lq_cmd(il, &lq_sta->lq, CMD_ASYNC, false);
2087 } else
2088 done_search = 1;
2089 }
2090
2091 if (done_search && !lq_sta->stay_in_tbl) {
2092 /* If the "active" (non-search) mode was legacy,
2093 * and we've tried switching antennas,
2094 * but we haven't been able to try HT modes (not available),
2095 * stay with best antenna legacy modulation for a while
2096 * before next round of mode comparisons. */
2097 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2098 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2099 lq_sta->action_counter > tbl1->max_search) {
2100 D_RATE("LQ: STAY in legacy table\n");
2101 il4965_rs_set_stay_in_table(il, 1, lq_sta);
2102 }
2103
2104 /* If we're in an HT mode, and all 3 mode switch actions
2105 * have been tried and compared, stay in this best modulation
2106 * mode for a while before next round of mode comparisons. */
2107 if (lq_sta->enable_counter &&
2108 lq_sta->action_counter >= tbl1->max_search) {
2109 if (lq_sta->last_tpt > IL_AGG_TPT_THREHOLD &&
2110 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2111 tid != MAX_TID_COUNT) {
2112 tid_data =
2113 &il->stations[lq_sta->lq.sta_id].tid[tid];
2114 if (tid_data->agg.state == IL_AGG_OFF) {
2115 D_RATE("try to aggregate tid %d\n",
2116 tid);
2117 il4965_rs_tl_turn_on_agg(il, tid,
2118 lq_sta, sta);
2119 }
2120 }
2121 il4965_rs_set_stay_in_table(il, 0, lq_sta);
2122 }
2123 }
2124
2125 out:
2126 tbl->current_rate =
2127 il4965_rate_n_flags_from_tbl(il, tbl, idx, is_green);
2128 i = idx;
2129 lq_sta->last_txrate_idx = i;
2130 }
2131
2132 /**
2133 * il4965_rs_initialize_lq - Initialize a station's hardware rate table
2134 *
2135 * The uCode's station table contains a table of fallback rates
2136 * for automatic fallback during transmission.
2137 *
2138 * NOTE: This sets up a default set of values. These will be replaced later
2139 * if the driver's iwl-4965-rs rate scaling algorithm is used, instead of
2140 * rc80211_simple.
2141 *
2142 * NOTE: Run C_ADD_STA command to set up station table entry, before
2143 * calling this function (which runs C_TX_LINK_QUALITY_CMD,
2144 * which requires station table entry to exist).
2145 */
2146 static void
2147 il4965_rs_initialize_lq(struct il_priv *il, struct ieee80211_conf *conf,
2148 struct ieee80211_sta *sta, struct il_lq_sta *lq_sta)
2149 {
2150 struct il_scale_tbl_info *tbl;
2151 int rate_idx;
2152 int i;
2153 u32 rate;
2154 u8 use_green;
2155 u8 active_tbl = 0;
2156 u8 valid_tx_ant;
2157
2158 if (!sta || !lq_sta)
2159 return;
2160
2161 use_green = il4965_rs_use_green(il, sta);
2162
2163 i = lq_sta->last_txrate_idx;
2164
2165 valid_tx_ant = il->hw_params.valid_tx_ant;
2166
2167 if (!lq_sta->search_better_tbl)
2168 active_tbl = lq_sta->active_tbl;
2169 else
2170 active_tbl = 1 - lq_sta->active_tbl;
2171
2172 tbl = &(lq_sta->lq_info[active_tbl]);
2173
2174 if (i < 0 || i >= RATE_COUNT)
2175 i = 0;
2176
2177 rate = il_rates[i].plcp;
2178 tbl->ant_type = il4965_first_antenna(valid_tx_ant);
2179 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2180
2181 if (i >= IL_FIRST_CCK_RATE && i <= IL_LAST_CCK_RATE)
2182 rate |= RATE_MCS_CCK_MSK;
2183
2184 il4965_rs_get_tbl_info_from_mcs(rate, il->band, tbl, &rate_idx);
2185 if (!il4965_rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2186 il4965_rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2187
2188 rate = il4965_rate_n_flags_from_tbl(il, tbl, rate_idx, use_green);
2189 tbl->current_rate = rate;
2190 il4965_rs_set_expected_tpt_table(lq_sta, tbl);
2191 il4965_rs_fill_link_cmd(NULL, lq_sta, rate);
2192 il->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2193 il_send_lq_cmd(il, &lq_sta->lq, CMD_SYNC, true);
2194 }
2195
2196 static void
2197 il4965_rs_get_rate(void *il_r, struct ieee80211_sta *sta, void *il_sta,
2198 struct ieee80211_tx_rate_control *txrc)
2199 {
2200
2201 struct sk_buff *skb = txrc->skb;
2202 struct ieee80211_supported_band *sband = txrc->sband;
2203 struct il_priv *il __maybe_unused = (struct il_priv *)il_r;
2204 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2205 struct il_lq_sta *lq_sta = il_sta;
2206 int rate_idx;
2207
2208 D_RATE("rate scale calculate new rate for skb\n");
2209
2210 /* Get max rate if user set max rate */
2211 if (lq_sta) {
2212 lq_sta->max_rate_idx = fls(txrc->rate_idx_mask) - 1;
2213 if (sband->band == NL80211_BAND_5GHZ &&
2214 lq_sta->max_rate_idx != -1)
2215 lq_sta->max_rate_idx += IL_FIRST_OFDM_RATE;
2216 if (lq_sta->max_rate_idx < 0 ||
2217 lq_sta->max_rate_idx >= RATE_COUNT)
2218 lq_sta->max_rate_idx = -1;
2219 }
2220
2221 /* Treat uninitialized rate scaling data same as non-existing. */
2222 if (lq_sta && !lq_sta->drv) {
2223 D_RATE("Rate scaling not initialized yet.\n");
2224 il_sta = NULL;
2225 }
2226
2227 /* Send management frames and NO_ACK data using lowest rate. */
2228 if (rate_control_send_low(sta, il_sta, txrc))
2229 return;
2230
2231 if (!lq_sta)
2232 return;
2233
2234 rate_idx = lq_sta->last_txrate_idx;
2235
2236 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2237 rate_idx -= IL_FIRST_OFDM_RATE;
2238 /* 6M and 9M shared same MCS idx */
2239 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2240 if (il4965_rs_extract_rate(lq_sta->last_rate_n_flags) >=
2241 RATE_MIMO2_6M_PLCP)
2242 rate_idx = rate_idx + MCS_IDX_PER_STREAM;
2243 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2244 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2245 info->control.rates[0].flags |=
2246 IEEE80211_TX_RC_SHORT_GI;
2247 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2248 info->control.rates[0].flags |=
2249 IEEE80211_TX_RC_DUP_DATA;
2250 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2251 info->control.rates[0].flags |=
2252 IEEE80211_TX_RC_40_MHZ_WIDTH;
2253 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2254 info->control.rates[0].flags |=
2255 IEEE80211_TX_RC_GREEN_FIELD;
2256 } else {
2257 /* Check for invalid rates */
2258 if (rate_idx < 0 || rate_idx >= RATE_COUNT_LEGACY ||
2259 (sband->band == NL80211_BAND_5GHZ &&
2260 rate_idx < IL_FIRST_OFDM_RATE))
2261 rate_idx = rate_lowest_index(sband, sta);
2262 /* On valid 5 GHz rate, adjust idx */
2263 else if (sband->band == NL80211_BAND_5GHZ)
2264 rate_idx -= IL_FIRST_OFDM_RATE;
2265 info->control.rates[0].flags = 0;
2266 }
2267 info->control.rates[0].idx = rate_idx;
2268 info->control.rates[0].count = 1;
2269 }
2270
2271 static void *
2272 il4965_rs_alloc_sta(void *il_rate, struct ieee80211_sta *sta, gfp_t gfp)
2273 {
2274 struct il_station_priv *sta_priv =
2275 (struct il_station_priv *)sta->drv_priv;
2276 struct il_priv *il;
2277
2278 il = (struct il_priv *)il_rate;
2279 D_RATE("create station rate scale win\n");
2280
2281 return &sta_priv->lq_sta;
2282 }
2283
2284 /*
2285 * Called after adding a new station to initialize rate scaling
2286 */
2287 void
2288 il4965_rs_rate_init(struct il_priv *il, struct ieee80211_sta *sta, u8 sta_id)
2289 {
2290 int i, j;
2291 struct ieee80211_hw *hw = il->hw;
2292 struct ieee80211_conf *conf = &il->hw->conf;
2293 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2294 struct il_station_priv *sta_priv;
2295 struct il_lq_sta *lq_sta;
2296 struct ieee80211_supported_band *sband;
2297
2298 sta_priv = (struct il_station_priv *)sta->drv_priv;
2299 lq_sta = &sta_priv->lq_sta;
2300 sband = hw->wiphy->bands[conf->chandef.chan->band];
2301
2302 lq_sta->lq.sta_id = sta_id;
2303
2304 for (j = 0; j < LQ_SIZE; j++)
2305 for (i = 0; i < RATE_COUNT; i++)
2306 il4965_rs_rate_scale_clear_win(&lq_sta->lq_info[j].
2307 win[i]);
2308
2309 lq_sta->flush_timer = 0;
2310 lq_sta->supp_rates = sta->supp_rates[sband->band];
2311 for (j = 0; j < LQ_SIZE; j++)
2312 for (i = 0; i < RATE_COUNT; i++)
2313 il4965_rs_rate_scale_clear_win(&lq_sta->lq_info[j].
2314 win[i]);
2315
2316 D_RATE("LQ:" "*** rate scale station global init for station %d ***\n",
2317 sta_id);
2318 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2319 * the lowest or the highest rate.. Could consider using RSSI from
2320 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2321 * after assoc.. */
2322
2323 lq_sta->is_dup = 0;
2324 lq_sta->max_rate_idx = -1;
2325 lq_sta->missed_rate_counter = IL_MISSED_RATE_MAX;
2326 lq_sta->is_green = il4965_rs_use_green(il, sta);
2327 lq_sta->active_legacy_rate = il->active_rate & ~(0x1000);
2328 lq_sta->band = il->band;
2329 /*
2330 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2331 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2332 */
2333 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2334 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2335 lq_sta->active_siso_rate &= ~((u16) 0x2);
2336 lq_sta->active_siso_rate <<= IL_FIRST_OFDM_RATE;
2337
2338 /* Same here */
2339 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2340 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2341 lq_sta->active_mimo2_rate &= ~((u16) 0x2);
2342 lq_sta->active_mimo2_rate <<= IL_FIRST_OFDM_RATE;
2343
2344 /* These values will be overridden later */
2345 lq_sta->lq.general_params.single_stream_ant_msk =
2346 il4965_first_antenna(il->hw_params.valid_tx_ant);
2347 lq_sta->lq.general_params.dual_stream_ant_msk =
2348 il->hw_params.valid_tx_ant & ~il4965_first_antenna(il->hw_params.
2349 valid_tx_ant);
2350 if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2351 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2352 } else if (il4965_num_of_ant(il->hw_params.valid_tx_ant) == 2) {
2353 lq_sta->lq.general_params.dual_stream_ant_msk =
2354 il->hw_params.valid_tx_ant;
2355 }
2356
2357 /* as default allow aggregation for all tids */
2358 lq_sta->tx_agg_tid_en = IL_AGG_ALL_TID;
2359 lq_sta->drv = il;
2360
2361 /* Set last_txrate_idx to lowest rate */
2362 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2363 if (sband->band == NL80211_BAND_5GHZ)
2364 lq_sta->last_txrate_idx += IL_FIRST_OFDM_RATE;
2365 lq_sta->is_agg = 0;
2366
2367 #ifdef CONFIG_MAC80211_DEBUGFS
2368 lq_sta->dbg_fixed_rate = 0;
2369 #endif
2370
2371 il4965_rs_initialize_lq(il, conf, sta, lq_sta);
2372 }
2373
2374 static void
2375 il4965_rs_fill_link_cmd(struct il_priv *il, struct il_lq_sta *lq_sta,
2376 u32 new_rate)
2377 {
2378 struct il_scale_tbl_info tbl_type;
2379 int idx = 0;
2380 int rate_idx;
2381 int repeat_rate = 0;
2382 u8 ant_toggle_cnt = 0;
2383 u8 use_ht_possible = 1;
2384 u8 valid_tx_ant = 0;
2385 struct il_link_quality_cmd *lq_cmd = &lq_sta->lq;
2386
2387 /* Override starting rate (idx 0) if needed for debug purposes */
2388 il4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, idx);
2389
2390 /* Interpret new_rate (rate_n_flags) */
2391 il4965_rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2392 &rate_idx);
2393
2394 /* How many times should we repeat the initial rate? */
2395 if (is_legacy(tbl_type.lq_type)) {
2396 ant_toggle_cnt = 1;
2397 repeat_rate = IL_NUMBER_TRY;
2398 } else {
2399 repeat_rate = IL_HT_NUMBER_TRY;
2400 }
2401
2402 lq_cmd->general_params.mimo_delimiter =
2403 is_mimo(tbl_type.lq_type) ? 1 : 0;
2404
2405 /* Fill 1st table entry (idx 0) */
2406 lq_cmd->rs_table[idx].rate_n_flags = cpu_to_le32(new_rate);
2407
2408 if (il4965_num_of_ant(tbl_type.ant_type) == 1) {
2409 lq_cmd->general_params.single_stream_ant_msk =
2410 tbl_type.ant_type;
2411 } else if (il4965_num_of_ant(tbl_type.ant_type) == 2) {
2412 lq_cmd->general_params.dual_stream_ant_msk = tbl_type.ant_type;
2413 }
2414 /* otherwise we don't modify the existing value */
2415 idx++;
2416 repeat_rate--;
2417 if (il)
2418 valid_tx_ant = il->hw_params.valid_tx_ant;
2419
2420 /* Fill rest of rate table */
2421 while (idx < LINK_QUAL_MAX_RETRY_NUM) {
2422 /* Repeat initial/next rate.
2423 * For legacy IL_NUMBER_TRY == 1, this loop will not execute.
2424 * For HT IL_HT_NUMBER_TRY == 3, this executes twice. */
2425 while (repeat_rate > 0 && idx < LINK_QUAL_MAX_RETRY_NUM) {
2426 if (is_legacy(tbl_type.lq_type)) {
2427 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2428 ant_toggle_cnt++;
2429 else if (il &&
2430 il4965_rs_toggle_antenna(valid_tx_ant,
2431 &new_rate,
2432 &tbl_type))
2433 ant_toggle_cnt = 1;
2434 }
2435
2436 /* Override next rate if needed for debug purposes */
2437 il4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, idx);
2438
2439 /* Fill next table entry */
2440 lq_cmd->rs_table[idx].rate_n_flags =
2441 cpu_to_le32(new_rate);
2442 repeat_rate--;
2443 idx++;
2444 }
2445
2446 il4965_rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2447 &tbl_type, &rate_idx);
2448
2449 /* Indicate to uCode which entries might be MIMO.
2450 * If initial rate was MIMO, this will finally end up
2451 * as (IL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2452 if (is_mimo(tbl_type.lq_type))
2453 lq_cmd->general_params.mimo_delimiter = idx;
2454
2455 /* Get next rate */
2456 new_rate =
2457 il4965_rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2458 use_ht_possible);
2459
2460 /* How many times should we repeat the next rate? */
2461 if (is_legacy(tbl_type.lq_type)) {
2462 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2463 ant_toggle_cnt++;
2464 else if (il &&
2465 il4965_rs_toggle_antenna(valid_tx_ant,
2466 &new_rate, &tbl_type))
2467 ant_toggle_cnt = 1;
2468
2469 repeat_rate = IL_NUMBER_TRY;
2470 } else {
2471 repeat_rate = IL_HT_NUMBER_TRY;
2472 }
2473
2474 /* Don't allow HT rates after next pass.
2475 * il4965_rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2476 use_ht_possible = 0;
2477
2478 /* Override next rate if needed for debug purposes */
2479 il4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, idx);
2480
2481 /* Fill next table entry */
2482 lq_cmd->rs_table[idx].rate_n_flags = cpu_to_le32(new_rate);
2483
2484 idx++;
2485 repeat_rate--;
2486 }
2487
2488 lq_cmd->agg_params.agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2489 lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2490
2491 lq_cmd->agg_params.agg_time_limit =
2492 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2493 }
2494
2495 static void *
2496 il4965_rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2497 {
2498 return hw->priv;
2499 }
2500
2501 /* rate scale requires free function to be implemented */
2502 static void
2503 il4965_rs_free(void *il_rate)
2504 {
2505 return;
2506 }
2507
2508 static void
2509 il4965_rs_free_sta(void *il_r, struct ieee80211_sta *sta, void *il_sta)
2510 {
2511 struct il_priv *il __maybe_unused = il_r;
2512
2513 D_RATE("enter\n");
2514 D_RATE("leave\n");
2515 }
2516
2517 #ifdef CONFIG_MAC80211_DEBUGFS
2518
2519 static void
2520 il4965_rs_dbgfs_set_mcs(struct il_lq_sta *lq_sta, u32 * rate_n_flags, int idx)
2521 {
2522 struct il_priv *il;
2523 u8 valid_tx_ant;
2524 u8 ant_sel_tx;
2525
2526 il = lq_sta->drv;
2527 valid_tx_ant = il->hw_params.valid_tx_ant;
2528 if (lq_sta->dbg_fixed_rate) {
2529 ant_sel_tx =
2530 ((lq_sta->
2531 dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK) >>
2532 RATE_MCS_ANT_POS);
2533 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
2534 *rate_n_flags = lq_sta->dbg_fixed_rate;
2535 D_RATE("Fixed rate ON\n");
2536 } else {
2537 lq_sta->dbg_fixed_rate = 0;
2538 IL_ERR
2539 ("Invalid antenna selection 0x%X, Valid is 0x%X\n",
2540 ant_sel_tx, valid_tx_ant);
2541 D_RATE("Fixed rate OFF\n");
2542 }
2543 } else {
2544 D_RATE("Fixed rate OFF\n");
2545 }
2546 }
2547
2548 static ssize_t
2549 il4965_rs_sta_dbgfs_scale_table_write(struct file *file,
2550 const char __user *user_buf,
2551 size_t count, loff_t *ppos)
2552 {
2553 struct il_lq_sta *lq_sta = file->private_data;
2554 struct il_priv *il;
2555 char buf[64];
2556 size_t buf_size;
2557 u32 parsed_rate;
2558
2559 il = lq_sta->drv;
2560 memset(buf, 0, sizeof(buf));
2561 buf_size = min(count, sizeof(buf) - 1);
2562 if (copy_from_user(buf, user_buf, buf_size))
2563 return -EFAULT;
2564
2565 if (sscanf(buf, "%x", &parsed_rate) == 1)
2566 lq_sta->dbg_fixed_rate = parsed_rate;
2567 else
2568 lq_sta->dbg_fixed_rate = 0;
2569
2570 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2571 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2572 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2573
2574 D_RATE("sta_id %d rate 0x%X\n", lq_sta->lq.sta_id,
2575 lq_sta->dbg_fixed_rate);
2576
2577 if (lq_sta->dbg_fixed_rate) {
2578 il4965_rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2579 il_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC, false);
2580 }
2581
2582 return count;
2583 }
2584
2585 static ssize_t
2586 il4965_rs_sta_dbgfs_scale_table_read(struct file *file, char __user *user_buf,
2587 size_t count, loff_t *ppos)
2588 {
2589 char *buff;
2590 int desc = 0;
2591 int i = 0;
2592 int idx = 0;
2593 ssize_t ret;
2594
2595 struct il_lq_sta *lq_sta = file->private_data;
2596 struct il_priv *il;
2597 struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2598
2599 il = lq_sta->drv;
2600 buff = kmalloc(1024, GFP_KERNEL);
2601 if (!buff)
2602 return -ENOMEM;
2603
2604 desc += sprintf(buff + desc, "sta_id %d\n", lq_sta->lq.sta_id);
2605 desc +=
2606 sprintf(buff + desc, "failed=%d success=%d rate=0%X\n",
2607 lq_sta->total_failed, lq_sta->total_success,
2608 lq_sta->active_legacy_rate);
2609 desc +=
2610 sprintf(buff + desc, "fixed rate 0x%X\n", lq_sta->dbg_fixed_rate);
2611 desc +=
2612 sprintf(buff + desc, "valid_tx_ant %s%s%s\n",
2613 (il->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
2614 (il->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
2615 (il->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
2616 desc +=
2617 sprintf(buff + desc, "lq type %s\n",
2618 (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
2619 if (is_Ht(tbl->lq_type)) {
2620 desc +=
2621 sprintf(buff + desc, " %s",
2622 (is_siso(tbl->lq_type)) ? "SISO" : "MIMO2");
2623 desc +=
2624 sprintf(buff + desc, " %s",
2625 (tbl->is_ht40) ? "40MHz" : "20MHz");
2626 desc +=
2627 sprintf(buff + desc, " %s %s %s\n",
2628 (tbl->is_SGI) ? "SGI" : "",
2629 (lq_sta->is_green) ? "GF enabled" : "",
2630 (lq_sta->is_agg) ? "AGG on" : "");
2631 }
2632 desc +=
2633 sprintf(buff + desc, "last tx rate=0x%X\n",
2634 lq_sta->last_rate_n_flags);
2635 desc +=
2636 sprintf(buff + desc,
2637 "general:" "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2638 lq_sta->lq.general_params.flags,
2639 lq_sta->lq.general_params.mimo_delimiter,
2640 lq_sta->lq.general_params.single_stream_ant_msk,
2641 lq_sta->lq.general_params.dual_stream_ant_msk);
2642
2643 desc +=
2644 sprintf(buff + desc,
2645 "agg:"
2646 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2647 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2648 lq_sta->lq.agg_params.agg_dis_start_th,
2649 lq_sta->lq.agg_params.agg_frame_cnt_limit);
2650
2651 desc +=
2652 sprintf(buff + desc,
2653 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2654 lq_sta->lq.general_params.start_rate_idx[0],
2655 lq_sta->lq.general_params.start_rate_idx[1],
2656 lq_sta->lq.general_params.start_rate_idx[2],
2657 lq_sta->lq.general_params.start_rate_idx[3]);
2658
2659 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2660 idx =
2661 il4965_hwrate_to_plcp_idx(le32_to_cpu
2662 (lq_sta->lq.rs_table[i].
2663 rate_n_flags));
2664 if (is_legacy(tbl->lq_type)) {
2665 desc +=
2666 sprintf(buff + desc, " rate[%d] 0x%X %smbps\n", i,
2667 le32_to_cpu(lq_sta->lq.rs_table[i].
2668 rate_n_flags),
2669 il_rate_mcs[idx].mbps);
2670 } else {
2671 desc +=
2672 sprintf(buff + desc, " rate[%d] 0x%X %smbps (%s)\n",
2673 i,
2674 le32_to_cpu(lq_sta->lq.rs_table[i].
2675 rate_n_flags),
2676 il_rate_mcs[idx].mbps,
2677 il_rate_mcs[idx].mcs);
2678 }
2679 }
2680
2681 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2682 kfree(buff);
2683 return ret;
2684 }
2685
2686 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2687 .write = il4965_rs_sta_dbgfs_scale_table_write,
2688 .read = il4965_rs_sta_dbgfs_scale_table_read,
2689 .open = simple_open,
2690 .llseek = default_llseek,
2691 };
2692
2693 static ssize_t
2694 il4965_rs_sta_dbgfs_stats_table_read(struct file *file, char __user *user_buf,
2695 size_t count, loff_t *ppos)
2696 {
2697 char *buff;
2698 int desc = 0;
2699 int i, j;
2700 ssize_t ret;
2701
2702 struct il_lq_sta *lq_sta = file->private_data;
2703
2704 buff = kmalloc(1024, GFP_KERNEL);
2705 if (!buff)
2706 return -ENOMEM;
2707
2708 for (i = 0; i < LQ_SIZE; i++) {
2709 desc +=
2710 sprintf(buff + desc,
2711 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
2712 "rate=0x%X\n", lq_sta->active_tbl == i ? "*" : "x",
2713 lq_sta->lq_info[i].lq_type,
2714 lq_sta->lq_info[i].is_SGI,
2715 lq_sta->lq_info[i].is_ht40,
2716 lq_sta->lq_info[i].is_dup, lq_sta->is_green,
2717 lq_sta->lq_info[i].current_rate);
2718 for (j = 0; j < RATE_COUNT; j++) {
2719 desc +=
2720 sprintf(buff + desc,
2721 "counter=%d success=%d %%=%d\n",
2722 lq_sta->lq_info[i].win[j].counter,
2723 lq_sta->lq_info[i].win[j].success_counter,
2724 lq_sta->lq_info[i].win[j].success_ratio);
2725 }
2726 }
2727 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2728 kfree(buff);
2729 return ret;
2730 }
2731
2732 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2733 .read = il4965_rs_sta_dbgfs_stats_table_read,
2734 .open = simple_open,
2735 .llseek = default_llseek,
2736 };
2737
2738 static ssize_t
2739 il4965_rs_sta_dbgfs_rate_scale_data_read(struct file *file,
2740 char __user *user_buf, size_t count,
2741 loff_t *ppos)
2742 {
2743 char buff[120];
2744 int desc = 0;
2745 struct il_lq_sta *lq_sta = file->private_data;
2746 struct il_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
2747
2748 if (is_Ht(tbl->lq_type))
2749 desc +=
2750 sprintf(buff + desc, "Bit Rate= %d Mb/s\n",
2751 tbl->expected_tpt[lq_sta->last_txrate_idx]);
2752 else
2753 desc +=
2754 sprintf(buff + desc, "Bit Rate= %d Mb/s\n",
2755 il_rates[lq_sta->last_txrate_idx].ieee >> 1);
2756
2757 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2758 }
2759
2760 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
2761 .read = il4965_rs_sta_dbgfs_rate_scale_data_read,
2762 .open = simple_open,
2763 .llseek = default_llseek,
2764 };
2765
2766 static void
2767 il4965_rs_add_debugfs(void *il, void *il_sta, struct dentry *dir)
2768 {
2769 struct il_lq_sta *lq_sta = il_sta;
2770 lq_sta->rs_sta_dbgfs_scale_table_file =
2771 debugfs_create_file("rate_scale_table", 0600, dir,
2772 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2773 lq_sta->rs_sta_dbgfs_stats_table_file =
2774 debugfs_create_file("rate_stats_table", 0400, dir, lq_sta,
2775 &rs_sta_dbgfs_stats_table_ops);
2776 lq_sta->rs_sta_dbgfs_rate_scale_data_file =
2777 debugfs_create_file("rate_scale_data", 0400, dir, lq_sta,
2778 &rs_sta_dbgfs_rate_scale_data_ops);
2779 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2780 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
2781 &lq_sta->tx_agg_tid_en);
2782
2783 }
2784
2785 static void
2786 il4965_rs_remove_debugfs(void *il, void *il_sta)
2787 {
2788 struct il_lq_sta *lq_sta = il_sta;
2789 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2790 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2791 debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
2792 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2793 }
2794 #endif
2795
2796 /*
2797 * Initialization of rate scaling information is done by driver after
2798 * the station is added. Since mac80211 calls this function before a
2799 * station is added we ignore it.
2800 */
2801 static void
2802 il4965_rs_rate_init_stub(void *il_r, struct ieee80211_supported_band *sband,
2803 struct cfg80211_chan_def *chandef,
2804 struct ieee80211_sta *sta, void *il_sta)
2805 {
2806 }
2807
2808 static const struct rate_control_ops rs_4965_ops = {
2809 .name = IL4965_RS_NAME,
2810 .tx_status = il4965_rs_tx_status,
2811 .get_rate = il4965_rs_get_rate,
2812 .rate_init = il4965_rs_rate_init_stub,
2813 .alloc = il4965_rs_alloc,
2814 .free = il4965_rs_free,
2815 .alloc_sta = il4965_rs_alloc_sta,
2816 .free_sta = il4965_rs_free_sta,
2817 #ifdef CONFIG_MAC80211_DEBUGFS
2818 .add_sta_debugfs = il4965_rs_add_debugfs,
2819 .remove_sta_debugfs = il4965_rs_remove_debugfs,
2820 #endif
2821 };
2822
2823 int
2824 il4965_rate_control_register(void)
2825 {
2826 return ieee80211_rate_control_register(&rs_4965_ops);
2827 }
2828
2829 void
2830 il4965_rate_control_unregister(void)
2831 {
2832 ieee80211_rate_control_unregister(&rs_4965_ops);
2833 }
Linux with added FPC-III support