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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
56static 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
66static 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 */
97const 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
113static int
114il4965_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
142static 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);
146static void il4965_rs_fill_link_cmd(struct il_priv *il,
147 struct il_lq_sta *lq_sta, u32 rate_n_flags);
148static void il4965_rs_stay_in_table(struct il_lq_sta *lq_sta,
149 bool force_search);
150
151#ifdef CONFIG_MAC80211_DEBUGFS
152static void il4965_rs_dbgfs_set_mcs(struct il_lq_sta *lq_sta,
153 u32 *rate_n_flags, int idx);
154#else
155static void
156il4965_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
172static s32 expected_tpt_legacy[RATE_COUNT] = {
173 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
174};
175
176static 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
183static 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
190static 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
197static 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 */
205static 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
223static inline u8
224il4965_rs_extract_rate(u32 rate_n_flags)
225{
226 return (u8) (rate_n_flags & 0xFF);
227}
228
229static void
230il4965_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
240static inline u8
241il4965_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 */
250static void
251il4965_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 */
271static u8
272il4965_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*/
324static u32
325il4965_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
353static int
354il4965_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
381static void
382il4965_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
392static inline int
393il4965_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 */
404static s32
405il4965_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 */
419static int
420il4965_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 */
497static u32
498il4965_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 */
551static int
552il4965_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 */
612static int
613il4965_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 */
643static bool
644il4965_rs_use_green(struct il_priv *il, struct ieee80211_sta *sta)
645{
646 return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
647 !il->ht.non_gf_sta_present;
648}
649
650/**
651 * il4965_rs_get_supported_rates - get the available rates
652 *
653 * if management frame or broadcast frame only return
654 * basic available rates.
655 *
656 */
657static u16
658il4965_rs_get_supported_rates(struct il_lq_sta *lq_sta,
659 struct ieee80211_hdr *hdr,
660 enum il_table_type rate_type)
661{
662 if (is_legacy(rate_type)) {
663 return lq_sta->active_legacy_rate;
664 } else {
665 if (is_siso(rate_type))
666 return lq_sta->active_siso_rate;
667 else
668 return lq_sta->active_mimo2_rate;
669 }
670}
671
672static u16
673il4965_rs_get_adjacent_rate(struct il_priv *il, u8 idx, u16 rate_mask,
674 int rate_type)
675{
676 u8 high = RATE_INVALID;
677 u8 low = RATE_INVALID;
678
679 /* 802.11A or ht walks to the next literal adjacent rate in
680 * the rate table */
681 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
682 int i;
683 u32 mask;
684
685 /* Find the previous rate that is in the rate mask */
686 i = idx - 1;
687 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
688 if (rate_mask & mask) {
689 low = i;
690 break;
691 }
692 }
693
694 /* Find the next rate that is in the rate mask */
695 i = idx + 1;
696 for (mask = (1 << i); i < RATE_COUNT; i++, mask <<= 1) {
697 if (rate_mask & mask) {
698 high = i;
699 break;
700 }
701 }
702
703 return (high << 8) | low;
704 }
705
706 low = idx;
707 while (low != RATE_INVALID) {
708 low = il_rates[low].prev_rs;
709 if (low == RATE_INVALID)
710 break;
711 if (rate_mask & (1 << low))
712 break;
713 D_RATE("Skipping masked lower rate: %d\n", low);
714 }
715
716 high = idx;
717 while (high != RATE_INVALID) {
718 high = il_rates[high].next_rs;
719 if (high == RATE_INVALID)
720 break;
721 if (rate_mask & (1 << high))
722 break;
723 D_RATE("Skipping masked higher rate: %d\n", high);
724 }
725
726 return (high << 8) | low;
727}
728
729static u32
730il4965_rs_get_lower_rate(struct il_lq_sta *lq_sta,
731 struct il_scale_tbl_info *tbl, u8 scale_idx,
732 u8 ht_possible)
733{
734 s32 low;
735 u16 rate_mask;
736 u16 high_low;
737 u8 switch_to_legacy = 0;
738 u8 is_green = lq_sta->is_green;
739 struct il_priv *il = lq_sta->drv;
740
741 /* check if we need to switch from HT to legacy rates.
742 * assumption is that mandatory rates (1Mbps or 6Mbps)
743 * are always supported (spec demand) */
744 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_idx)) {
745 switch_to_legacy = 1;
746 scale_idx = rs_ht_to_legacy[scale_idx];
747 if (lq_sta->band == IEEE80211_BAND_5GHZ)
748 tbl->lq_type = LQ_A;
749 else
750 tbl->lq_type = LQ_G;
751
752 if (il4965_num_of_ant(tbl->ant_type) > 1)
753 tbl->ant_type =
754 il4965_first_antenna(il->hw_params.valid_tx_ant);
755
756 tbl->is_ht40 = 0;
757 tbl->is_SGI = 0;
758 tbl->max_search = IL_MAX_SEARCH;
759 }
760
761 rate_mask = il4965_rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
762
763 /* Mask with station rate restriction */
764 if (is_legacy(tbl->lq_type)) {
765 /* supp_rates has no CCK bits in A mode */
766 if (lq_sta->band == IEEE80211_BAND_5GHZ)
767 rate_mask =
768 (u16) (rate_mask &
769 (lq_sta->supp_rates << IL_FIRST_OFDM_RATE));
770 else
771 rate_mask = (u16) (rate_mask & lq_sta->supp_rates);
772 }
773
774 /* If we switched from HT to legacy, check current rate */
775 if (switch_to_legacy && (rate_mask & (1 << scale_idx))) {
776 low = scale_idx;
777 goto out;
778 }
779
780 high_low =
781 il4965_rs_get_adjacent_rate(lq_sta->drv, scale_idx, rate_mask,
782 tbl->lq_type);
783 low = high_low & 0xff;
784
785 if (low == RATE_INVALID)
786 low = scale_idx;
787
788out:
789 return il4965_rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
790}
791
792/*
793 * Simple function to compare two rate scale table types
794 */
795static bool
796il4965_table_type_matches(struct il_scale_tbl_info *a,
797 struct il_scale_tbl_info *b)
798{
799 return (a->lq_type == b->lq_type && a->ant_type == b->ant_type &&
800 a->is_SGI == b->is_SGI);
801}
802
803/*
804 * mac80211 sends us Tx status
805 */
806static void
807il4965_rs_tx_status(void *il_r, struct ieee80211_supported_band *sband,
808 struct ieee80211_sta *sta, void *il_sta,
809 struct sk_buff *skb)
810{
811 int legacy_success;
812 int retries;
813 int rs_idx, mac_idx, i;
814 struct il_lq_sta *lq_sta = il_sta;
815 struct il_link_quality_cmd *table;
816 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
817 struct il_priv *il = (struct il_priv *)il_r;
818 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
819 enum mac80211_rate_control_flags mac_flags;
820 u32 tx_rate;
821 struct il_scale_tbl_info tbl_type;
822 struct il_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
823
824 D_RATE("get frame ack response, update rate scale win\n");
825
826 /* Treat uninitialized rate scaling data same as non-existing. */
827 if (!lq_sta) {
828 D_RATE("Station rate scaling not created yet.\n");
829 return;
830 } else if (!lq_sta->drv) {
831 D_RATE("Rate scaling not initialized yet.\n");
832 return;
833 }
834
835 if (!ieee80211_is_data(hdr->frame_control) ||
836 (info->flags & IEEE80211_TX_CTL_NO_ACK))
837 return;
838
839 /* This packet was aggregated but doesn't carry status info */
840 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
841 !(info->flags & IEEE80211_TX_STAT_AMPDU))
842 return;
843
844 /*
845 * Ignore this Tx frame response if its initial rate doesn't match
846 * that of latest Link Quality command. There may be stragglers
847 * from a previous Link Quality command, but we're no longer interested
848 * in those; they're either from the "active" mode while we're trying
849 * to check "search" mode, or a prior "search" mode after we've moved
850 * to a new "search" mode (which might become the new "active" mode).
851 */
852 table = &lq_sta->lq;
853 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
854 il4965_rs_get_tbl_info_from_mcs(tx_rate, il->band, &tbl_type, &rs_idx);
855 if (il->band == IEEE80211_BAND_5GHZ)
856 rs_idx -= IL_FIRST_OFDM_RATE;
857 mac_flags = info->status.rates[0].flags;
858 mac_idx = info->status.rates[0].idx;
859 /* For HT packets, map MCS to PLCP */
860 if (mac_flags & IEEE80211_TX_RC_MCS) {
861 mac_idx &= RATE_MCS_CODE_MSK; /* Remove # of streams */
862 if (mac_idx >= (RATE_9M_IDX - IL_FIRST_OFDM_RATE))
863 mac_idx++;
864 /*
865 * mac80211 HT idx is always zero-idxed; we need to move
866 * HT OFDM rates after CCK rates in 2.4 GHz band
867 */
868 if (il->band == IEEE80211_BAND_2GHZ)
869 mac_idx += IL_FIRST_OFDM_RATE;
870 }
871 /* Here we actually compare this rate to the latest LQ command */
872 if (mac_idx < 0 ||
873 tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI) ||
874 tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH) ||
875 tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA) ||
876 tbl_type.ant_type != info->status.antenna ||
877 !!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)
878 || !!(tx_rate & RATE_MCS_GF_MSK) !=
879 !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD) || rs_idx != mac_idx) {
880 D_RATE("initial rate %d does not match %d (0x%x)\n", mac_idx,
881 rs_idx, tx_rate);
882 /*
883 * Since rates mis-match, the last LQ command may have failed.
884 * After IL_MISSED_RATE_MAX mis-matches, resync the uCode with
885 * ... driver.
886 */
887 lq_sta->missed_rate_counter++;
888 if (lq_sta->missed_rate_counter > IL_MISSED_RATE_MAX) {
889 lq_sta->missed_rate_counter = 0;
890 il_send_lq_cmd(il, &lq_sta->lq, CMD_ASYNC, false);
891 }
892 /* Regardless, ignore this status info for outdated rate */
893 return;
894 } else
895 /* Rate did match, so reset the missed_rate_counter */
896 lq_sta->missed_rate_counter = 0;
897
898 /* Figure out if rate scale algorithm is in active or search table */
899 if (il4965_table_type_matches
900 (&tbl_type, &(lq_sta->lq_info[lq_sta->active_tbl]))) {
901 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
902 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
903 } else
904 if (il4965_table_type_matches
905 (&tbl_type, &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
906 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
907 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
908 } else {
909 D_RATE("Neither active nor search matches tx rate\n");
910 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
911 D_RATE("active- lq:%x, ant:%x, SGI:%d\n", tmp_tbl->lq_type,
912 tmp_tbl->ant_type, tmp_tbl->is_SGI);
913 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
914 D_RATE("search- lq:%x, ant:%x, SGI:%d\n", tmp_tbl->lq_type,
915 tmp_tbl->ant_type, tmp_tbl->is_SGI);
916 D_RATE("actual- lq:%x, ant:%x, SGI:%d\n", tbl_type.lq_type,
917 tbl_type.ant_type, tbl_type.is_SGI);
918 /*
919 * no matching table found, let's by-pass the data collection
920 * and continue to perform rate scale to find the rate table
921 */
922 il4965_rs_stay_in_table(lq_sta, true);
923 goto done;
924 }
925
926 /*
927 * Updating the frame history depends on whether packets were
928 * aggregated.
929 *
930 * For aggregation, all packets were transmitted at the same rate, the
931 * first idx into rate scale table.
932 */
933 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
934 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
935 il4965_rs_get_tbl_info_from_mcs(tx_rate, il->band, &tbl_type,
936 &rs_idx);
937 il4965_rs_collect_tx_data(curr_tbl, rs_idx,
938 info->status.ampdu_len,
939 info->status.ampdu_ack_len);
940
941 /* Update success/fail counts if not searching for new mode */
942 if (lq_sta->stay_in_tbl) {
943 lq_sta->total_success += info->status.ampdu_ack_len;
944 lq_sta->total_failed +=
945 (info->status.ampdu_len -
946 info->status.ampdu_ack_len);
947 }
948 } else {
949 /*
950 * For legacy, update frame history with for each Tx retry.
951 */
952 retries = info->status.rates[0].count - 1;
953 /* HW doesn't send more than 15 retries */
954 retries = min(retries, 15);
955
956 /* The last transmission may have been successful */
957 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
958 /* Collect data for each rate used during failed TX attempts */
959 for (i = 0; i <= retries; ++i) {
960 tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
961 il4965_rs_get_tbl_info_from_mcs(tx_rate, il->band,
962 &tbl_type, &rs_idx);
963 /*
964 * Only collect stats if retried rate is in the same RS
965 * table as active/search.
966 */
967 if (il4965_table_type_matches(&tbl_type, curr_tbl))
968 tmp_tbl = curr_tbl;
969 else if (il4965_table_type_matches
970 (&tbl_type, other_tbl))
971 tmp_tbl = other_tbl;
972 else
973 continue;
974 il4965_rs_collect_tx_data(tmp_tbl, rs_idx, 1,
975 i <
976 retries ? 0 : legacy_success);
977 }
978
979 /* Update success/fail counts if not searching for new mode */
980 if (lq_sta->stay_in_tbl) {
981 lq_sta->total_success += legacy_success;
982 lq_sta->total_failed += retries + (1 - legacy_success);
983 }
984 }
985 /* The last TX rate is cached in lq_sta; it's set in if/else above */
986 lq_sta->last_rate_n_flags = tx_rate;
987done:
988 /* See if there's a better rate or modulation mode to try. */
989 if (sta->supp_rates[sband->band])
990 il4965_rs_rate_scale_perform(il, skb, sta, lq_sta);
991}
992
993/*
994 * Begin a period of staying with a selected modulation mode.
995 * Set "stay_in_tbl" flag to prevent any mode switches.
996 * Set frame tx success limits according to legacy vs. high-throughput,
997 * and reset overall (spanning all rates) tx success history stats.
998 * These control how long we stay using same modulation mode before
999 * searching for a new mode.
1000 */
1001static void
1002il4965_rs_set_stay_in_table(struct il_priv *il, u8 is_legacy,
1003 struct il_lq_sta *lq_sta)
1004{
1005 D_RATE("we are staying in the same table\n");
1006 lq_sta->stay_in_tbl = 1; /* only place this gets set */
1007 if (is_legacy) {
1008 lq_sta->table_count_limit = IL_LEGACY_TBL_COUNT;
1009 lq_sta->max_failure_limit = IL_LEGACY_FAILURE_LIMIT;
1010 lq_sta->max_success_limit = IL_LEGACY_SUCCESS_LIMIT;
1011 } else {
1012 lq_sta->table_count_limit = IL_NONE_LEGACY_TBL_COUNT;
1013 lq_sta->max_failure_limit = IL_NONE_LEGACY_FAILURE_LIMIT;
1014 lq_sta->max_success_limit = IL_NONE_LEGACY_SUCCESS_LIMIT;
1015 }
1016 lq_sta->table_count = 0;
1017 lq_sta->total_failed = 0;
1018 lq_sta->total_success = 0;
1019 lq_sta->flush_timer = jiffies;
1020 lq_sta->action_counter = 0;
1021}
1022
1023/*
1024 * Find correct throughput table for given mode of modulation
1025 */
1026static void
1027il4965_rs_set_expected_tpt_table(struct il_lq_sta *lq_sta,
1028 struct il_scale_tbl_info *tbl)
1029{
1030 /* Used to choose among HT tables */
1031 s32(*ht_tbl_pointer)[RATE_COUNT];
1032
1033 /* Check for invalid LQ type */
1034 if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1035 tbl->expected_tpt = expected_tpt_legacy;
1036 return;
1037 }
1038
1039 /* Legacy rates have only one table */
1040 if (is_legacy(tbl->lq_type)) {
1041 tbl->expected_tpt = expected_tpt_legacy;
1042 return;
1043 }
1044
1045 /* Choose among many HT tables depending on number of streams
1046 * (SISO/MIMO2), channel width (20/40), SGI, and aggregation
1047 * status */
1048 if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1049 ht_tbl_pointer = expected_tpt_siso20MHz;
1050 else if (is_siso(tbl->lq_type))
1051 ht_tbl_pointer = expected_tpt_siso40MHz;
1052 else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1053 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1054 else /* if (is_mimo2(tbl->lq_type)) <-- must be true */
1055 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1056
1057 if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */
1058 tbl->expected_tpt = ht_tbl_pointer[0];
1059 else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */
1060 tbl->expected_tpt = ht_tbl_pointer[1];
1061 else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */
1062 tbl->expected_tpt = ht_tbl_pointer[2];
1063 else /* AGG+SGI */
1064 tbl->expected_tpt = ht_tbl_pointer[3];
1065}
1066
1067/*
1068 * Find starting rate for new "search" high-throughput mode of modulation.
1069 * Goal is to find lowest expected rate (under perfect conditions) that is
1070 * above the current measured throughput of "active" mode, to give new mode
1071 * a fair chance to prove itself without too many challenges.
1072 *
1073 * This gets called when transitioning to more aggressive modulation
1074 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1075 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1076 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1077 * bit rate will typically need to increase, but not if performance was bad.
1078 */
1079static s32
1080il4965_rs_get_best_rate(struct il_priv *il, struct il_lq_sta *lq_sta,
1081 struct il_scale_tbl_info *tbl, /* "search" */
1082 u16 rate_mask, s8 idx)
1083{
1084 /* "active" values */
1085 struct il_scale_tbl_info *active_tbl =
1086 &(lq_sta->lq_info[lq_sta->active_tbl]);
1087 s32 active_sr = active_tbl->win[idx].success_ratio;
1088 s32 active_tpt = active_tbl->expected_tpt[idx];
1089
1090 /* expected "search" throughput */
1091 s32 *tpt_tbl = tbl->expected_tpt;
1092
1093 s32 new_rate, high, low, start_hi;
1094 u16 high_low;
1095 s8 rate = idx;
1096
1097 new_rate = high = low = start_hi = RATE_INVALID;
1098
1099 for (;;) {
1100 high_low =
1101 il4965_rs_get_adjacent_rate(il, rate, rate_mask,
1102 tbl->lq_type);
1103
1104 low = high_low & 0xff;
1105 high = (high_low >> 8) & 0xff;
1106
1107 /*
1108 * Lower the "search" bit rate, to give new "search" mode
1109 * approximately the same throughput as "active" if:
1110 *
1111 * 1) "Active" mode has been working modestly well (but not
1112 * great), and expected "search" throughput (under perfect
1113 * conditions) at candidate rate is above the actual
1114 * measured "active" throughput (but less than expected
1115 * "active" throughput under perfect conditions).
1116 * OR
1117 * 2) "Active" mode has been working perfectly or very well
1118 * and expected "search" throughput (under perfect
1119 * conditions) at candidate rate is above expected
1120 * "active" throughput (under perfect conditions).
1121 */
1122 if ((100 * tpt_tbl[rate] > lq_sta->last_tpt &&
1123 (active_sr > RATE_DECREASE_TH && active_sr <= RATE_HIGH_TH
1124 && tpt_tbl[rate] <= active_tpt)) ||
1125 (active_sr >= RATE_SCALE_SWITCH &&
1126 tpt_tbl[rate] > active_tpt)) {
1127
1128 /* (2nd or later pass)
1129 * If we've already tried to raise the rate, and are
1130 * now trying to lower it, use the higher rate. */
1131 if (start_hi != RATE_INVALID) {
1132 new_rate = start_hi;
1133 break;
1134 }
1135
1136 new_rate = rate;
1137
1138 /* Loop again with lower rate */
1139 if (low != RATE_INVALID)
1140 rate = low;
1141
1142 /* Lower rate not available, use the original */
1143 else
1144 break;
1145
1146 /* Else try to raise the "search" rate to match "active" */
1147 } else {
1148 /* (2nd or later pass)
1149 * If we've already tried to lower the rate, and are
1150 * now trying to raise it, use the lower rate. */
1151 if (new_rate != RATE_INVALID)
1152 break;
1153
1154 /* Loop again with higher rate */
1155 else if (high != RATE_INVALID) {
1156 start_hi = high;
1157 rate = high;
1158
1159 /* Higher rate not available, use the original */
1160 } else {
1161 new_rate = rate;
1162 break;
1163 }
1164 }
1165 }
1166
1167 return new_rate;
1168}
1169
1170/*
1171 * Set up search table for MIMO2
1172 */
1173static int
1174il4965_rs_switch_to_mimo2(struct il_priv *il, struct il_lq_sta *lq_sta,
1175 struct ieee80211_conf *conf,
1176 struct ieee80211_sta *sta,
1177 struct il_scale_tbl_info *tbl, int idx)
1178{
1179 u16 rate_mask;
1180 s32 rate;
1181 s8 is_green = lq_sta->is_green;
1182
1183 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1184 return -1;
1185
1186 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2) ==
1187 WLAN_HT_CAP_SM_PS_STATIC)
1188 return -1;
1189
1190 /* Need both Tx chains/antennas to support MIMO */
1191 if (il->hw_params.tx_chains_num < 2)
1192 return -1;
1193
1194 D_RATE("LQ: try to switch to MIMO2\n");
1195
1196 tbl->lq_type = LQ_MIMO2;
1197 tbl->is_dup = lq_sta->is_dup;
1198 tbl->action = 0;
1199 tbl->max_search = IL_MAX_SEARCH;
1200 rate_mask = lq_sta->active_mimo2_rate;
1201
1202 if (il_is_ht40_tx_allowed(il, &sta->ht_cap))
1203 tbl->is_ht40 = 1;
1204 else
1205 tbl->is_ht40 = 0;
1206
1207 il4965_rs_set_expected_tpt_table(lq_sta, tbl);
1208
1209 rate = il4965_rs_get_best_rate(il, lq_sta, tbl, rate_mask, idx);
1210
1211 D_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1212 if (rate == RATE_INVALID || !((1 << rate) & rate_mask)) {
1213 D_RATE("Can't switch with idx %d rate mask %x\n", rate,
1214 rate_mask);
1215 return -1;
1216 }
1217 tbl->current_rate =
1218 il4965_rate_n_flags_from_tbl(il, tbl, rate, is_green);
1219
1220 D_RATE("LQ: Switch to new mcs %X idx is green %X\n", tbl->current_rate,
1221 is_green);
1222 return 0;
1223}
1224
1225/*
1226 * Set up search table for SISO
1227 */
1228static int
1229il4965_rs_switch_to_siso(struct il_priv *il, struct il_lq_sta *lq_sta,
1230 struct ieee80211_conf *conf, struct ieee80211_sta *sta,
1231 struct il_scale_tbl_info *tbl, int idx)
1232{
1233 u16 rate_mask;
1234 u8 is_green = lq_sta->is_green;
1235 s32 rate;
1236
1237 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1238 return -1;
1239
1240 D_RATE("LQ: try to switch to SISO\n");
1241
1242 tbl->is_dup = lq_sta->is_dup;
1243 tbl->lq_type = LQ_SISO;
1244 tbl->action = 0;
1245 tbl->max_search = IL_MAX_SEARCH;
1246 rate_mask = lq_sta->active_siso_rate;
1247
1248 if (il_is_ht40_tx_allowed(il, &sta->ht_cap))
1249 tbl->is_ht40 = 1;
1250 else
1251 tbl->is_ht40 = 0;
1252
1253 if (is_green)
1254 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield */
1255
1256 il4965_rs_set_expected_tpt_table(lq_sta, tbl);
1257 rate = il4965_rs_get_best_rate(il, lq_sta, tbl, rate_mask, idx);
1258
1259 D_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask);
1260 if (rate == RATE_INVALID || !((1 << rate) & rate_mask)) {
1261 D_RATE("can not switch with idx %d rate mask %x\n", rate,
1262 rate_mask);
1263 return -1;
1264 }
1265 tbl->current_rate =
1266 il4965_rate_n_flags_from_tbl(il, tbl, rate, is_green);
1267 D_RATE("LQ: Switch to new mcs %X idx is green %X\n", tbl->current_rate,
1268 is_green);
1269 return 0;
1270}
1271
1272/*
1273 * Try to switch to new modulation mode from legacy
1274 */
1275static int
1276il4965_rs_move_legacy_other(struct il_priv *il, struct il_lq_sta *lq_sta,
1277 struct ieee80211_conf *conf,
1278 struct ieee80211_sta *sta, int idx)
1279{
1280 struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1281 struct il_scale_tbl_info *search_tbl =
1282 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1283 struct il_rate_scale_data *win = &(tbl->win[idx]);
1284 u32 sz =
1285 (sizeof(struct il_scale_tbl_info) -
1286 (sizeof(struct il_rate_scale_data) * RATE_COUNT));
1287 u8 start_action;
1288 u8 valid_tx_ant = il->hw_params.valid_tx_ant;
1289 u8 tx_chains_num = il->hw_params.tx_chains_num;
1290 int ret = 0;
1291 u8 update_search_tbl_counter = 0;
1292
1293 tbl->action = IL_LEGACY_SWITCH_SISO;
1294
1295 start_action = tbl->action;
1296 for (;;) {
1297 lq_sta->action_counter++;
1298 switch (tbl->action) {
1299 case IL_LEGACY_SWITCH_ANTENNA1:
1300 case IL_LEGACY_SWITCH_ANTENNA2:
1301 D_RATE("LQ: Legacy toggle Antenna\n");
1302
1303 if ((tbl->action == IL_LEGACY_SWITCH_ANTENNA1 &&
1304 tx_chains_num <= 1) ||
1305 (tbl->action == IL_LEGACY_SWITCH_ANTENNA2 &&
1306 tx_chains_num <= 2))
1307 break;
1308
1309 /* Don't change antenna if success has been great */
1310 if (win->success_ratio >= IL_RS_GOOD_RATIO)
1311 break;
1312
1313 /* Set up search table to try other antenna */
1314 memcpy(search_tbl, tbl, sz);
1315
1316 if (il4965_rs_toggle_antenna
1317 (valid_tx_ant, &search_tbl->current_rate,
1318 search_tbl)) {
1319 update_search_tbl_counter = 1;
1320 il4965_rs_set_expected_tpt_table(lq_sta,
1321 search_tbl);
1322 goto out;
1323 }
1324 break;
1325 case IL_LEGACY_SWITCH_SISO:
1326 D_RATE("LQ: Legacy switch to SISO\n");
1327
1328 /* Set up search table to try SISO */
1329 memcpy(search_tbl, tbl, sz);
1330 search_tbl->is_SGI = 0;
1331 ret =
1332 il4965_rs_switch_to_siso(il, lq_sta, conf, sta,
1333 search_tbl, idx);
1334 if (!ret) {
1335 lq_sta->action_counter = 0;
1336 goto out;
1337 }
1338
1339 break;
1340 case IL_LEGACY_SWITCH_MIMO2_AB:
1341 case IL_LEGACY_SWITCH_MIMO2_AC:
1342 case IL_LEGACY_SWITCH_MIMO2_BC:
1343 D_RATE("LQ: Legacy switch to MIMO2\n");
1344
1345 /* Set up search table to try MIMO */
1346 memcpy(search_tbl, tbl, sz);
1347 search_tbl->is_SGI = 0;
1348
1349 if (tbl->action == IL_LEGACY_SWITCH_MIMO2_AB)
1350 search_tbl->ant_type = ANT_AB;
1351 else if (tbl->action == IL_LEGACY_SWITCH_MIMO2_AC)
1352 search_tbl->ant_type = ANT_AC;
1353 else
1354 search_tbl->ant_type = ANT_BC;
1355
1356 if (!il4965_rs_is_valid_ant
1357 (valid_tx_ant, search_tbl->ant_type))
1358 break;
1359
1360 ret =
1361 il4965_rs_switch_to_mimo2(il, lq_sta, conf, sta,
1362 search_tbl, idx);
1363 if (!ret) {
1364 lq_sta->action_counter = 0;
1365 goto out;
1366 }
1367 break;
1368 }
1369 tbl->action++;
1370 if (tbl->action > IL_LEGACY_SWITCH_MIMO2_BC)
1371 tbl->action = IL_LEGACY_SWITCH_ANTENNA1;
1372
1373 if (tbl->action == start_action)
1374 break;
1375
1376 }
1377 search_tbl->lq_type = LQ_NONE;
1378 return 0;
1379
1380out:
1381 lq_sta->search_better_tbl = 1;
1382 tbl->action++;
1383 if (tbl->action > IL_LEGACY_SWITCH_MIMO2_BC)
1384 tbl->action = IL_LEGACY_SWITCH_ANTENNA1;
1385 if (update_search_tbl_counter)
1386 search_tbl->action = tbl->action;
1387 return 0;
1388
1389}
1390
1391/*
1392 * Try to switch to new modulation mode from SISO
1393 */
1394static int
1395il4965_rs_move_siso_to_other(struct il_priv *il, struct il_lq_sta *lq_sta,
1396 struct ieee80211_conf *conf,
1397 struct ieee80211_sta *sta, int idx)
1398{
1399 u8 is_green = lq_sta->is_green;
1400 struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1401 struct il_scale_tbl_info *search_tbl =
1402 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1403 struct il_rate_scale_data *win = &(tbl->win[idx]);
1404 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1405 u32 sz =
1406 (sizeof(struct il_scale_tbl_info) -
1407 (sizeof(struct il_rate_scale_data) * RATE_COUNT));
1408 u8 start_action;
1409 u8 valid_tx_ant = il->hw_params.valid_tx_ant;
1410 u8 tx_chains_num = il->hw_params.tx_chains_num;
1411 u8 update_search_tbl_counter = 0;
1412 int ret;
1413
1414 start_action = tbl->action;
1415
1416 for (;;) {
1417 lq_sta->action_counter++;
1418 switch (tbl->action) {
1419 case IL_SISO_SWITCH_ANTENNA1:
1420 case IL_SISO_SWITCH_ANTENNA2:
1421 D_RATE("LQ: SISO toggle Antenna\n");
1422 if ((tbl->action == IL_SISO_SWITCH_ANTENNA1 &&
1423 tx_chains_num <= 1) ||
1424 (tbl->action == IL_SISO_SWITCH_ANTENNA2 &&
1425 tx_chains_num <= 2))
1426 break;
1427
1428 if (win->success_ratio >= IL_RS_GOOD_RATIO)
1429 break;
1430
1431 memcpy(search_tbl, tbl, sz);
1432 if (il4965_rs_toggle_antenna
1433 (valid_tx_ant, &search_tbl->current_rate,
1434 search_tbl)) {
1435 update_search_tbl_counter = 1;
1436 goto out;
1437 }
1438 break;
1439 case IL_SISO_SWITCH_MIMO2_AB:
1440 case IL_SISO_SWITCH_MIMO2_AC:
1441 case IL_SISO_SWITCH_MIMO2_BC:
1442 D_RATE("LQ: SISO switch to MIMO2\n");
1443 memcpy(search_tbl, tbl, sz);
1444 search_tbl->is_SGI = 0;
1445
1446 if (tbl->action == IL_SISO_SWITCH_MIMO2_AB)
1447 search_tbl->ant_type = ANT_AB;
1448 else if (tbl->action == IL_SISO_SWITCH_MIMO2_AC)
1449 search_tbl->ant_type = ANT_AC;
1450 else
1451 search_tbl->ant_type = ANT_BC;
1452
1453 if (!il4965_rs_is_valid_ant
1454 (valid_tx_ant, search_tbl->ant_type))
1455 break;
1456
1457 ret =
1458 il4965_rs_switch_to_mimo2(il, lq_sta, conf, sta,
1459 search_tbl, idx);
1460 if (!ret)
1461 goto out;
1462 break;
1463 case IL_SISO_SWITCH_GI:
1464 if (!tbl->is_ht40 &&
1465 !(ht_cap->cap & IEEE80211_HT_CAP_SGI_20))
1466 break;
1467 if (tbl->is_ht40 &&
1468 !(ht_cap->cap & IEEE80211_HT_CAP_SGI_40))
1469 break;
1470
1471 D_RATE("LQ: SISO toggle SGI/NGI\n");
1472
1473 memcpy(search_tbl, tbl, sz);
1474 if (is_green) {
1475 if (!tbl->is_SGI)
1476 break;
1477 else
1478 IL_ERR("SGI was set in GF+SISO\n");
1479 }
1480 search_tbl->is_SGI = !tbl->is_SGI;
1481 il4965_rs_set_expected_tpt_table(lq_sta, search_tbl);
1482 if (tbl->is_SGI) {
1483 s32 tpt = lq_sta->last_tpt / 100;
1484 if (tpt >= search_tbl->expected_tpt[idx])
1485 break;
1486 }
1487 search_tbl->current_rate =
1488 il4965_rate_n_flags_from_tbl(il, search_tbl, idx,
1489 is_green);
1490 update_search_tbl_counter = 1;
1491 goto out;
1492 }
1493 tbl->action++;
1494 if (tbl->action > IL_SISO_SWITCH_GI)
1495 tbl->action = IL_SISO_SWITCH_ANTENNA1;
1496
1497 if (tbl->action == start_action)
1498 break;
1499 }
1500 search_tbl->lq_type = LQ_NONE;
1501 return 0;
1502
1503out:
1504 lq_sta->search_better_tbl = 1;
1505 tbl->action++;
1506 if (tbl->action > IL_SISO_SWITCH_GI)
1507 tbl->action = IL_SISO_SWITCH_ANTENNA1;
1508 if (update_search_tbl_counter)
1509 search_tbl->action = tbl->action;
1510
1511 return 0;
1512}
1513
1514/*
1515 * Try to switch to new modulation mode from MIMO2
1516 */
1517static int
1518il4965_rs_move_mimo2_to_other(struct il_priv *il, struct il_lq_sta *lq_sta,
1519 struct ieee80211_conf *conf,
1520 struct ieee80211_sta *sta, int idx)
1521{
1522 s8 is_green = lq_sta->is_green;
1523 struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1524 struct il_scale_tbl_info *search_tbl =
1525 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1526 struct il_rate_scale_data *win = &(tbl->win[idx]);
1527 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1528 u32 sz =
1529 (sizeof(struct il_scale_tbl_info) -
1530 (sizeof(struct il_rate_scale_data) * RATE_COUNT));
1531 u8 start_action;
1532 u8 valid_tx_ant = il->hw_params.valid_tx_ant;
1533 u8 tx_chains_num = il->hw_params.tx_chains_num;
1534 u8 update_search_tbl_counter = 0;
1535 int ret;
1536
1537 start_action = tbl->action;
1538 for (;;) {
1539 lq_sta->action_counter++;
1540 switch (tbl->action) {
1541 case IL_MIMO2_SWITCH_ANTENNA1:
1542 case IL_MIMO2_SWITCH_ANTENNA2:
1543 D_RATE("LQ: MIMO2 toggle Antennas\n");
1544
1545 if (tx_chains_num <= 2)
1546 break;
1547
1548 if (win->success_ratio >= IL_RS_GOOD_RATIO)
1549 break;
1550
1551 memcpy(search_tbl, tbl, sz);
1552 if (il4965_rs_toggle_antenna
1553 (valid_tx_ant, &search_tbl->current_rate,
1554 search_tbl)) {
1555 update_search_tbl_counter = 1;
1556 goto out;
1557 }
1558 break;
1559 case IL_MIMO2_SWITCH_SISO_A:
1560 case IL_MIMO2_SWITCH_SISO_B:
1561 case IL_MIMO2_SWITCH_SISO_C:
1562 D_RATE("LQ: MIMO2 switch to SISO\n");
1563
1564 /* Set up new search table for SISO */
1565 memcpy(search_tbl, tbl, sz);
1566
1567 if (tbl->action == IL_MIMO2_SWITCH_SISO_A)
1568 search_tbl->ant_type = ANT_A;
1569 else if (tbl->action == IL_MIMO2_SWITCH_SISO_B)
1570 search_tbl->ant_type = ANT_B;
1571 else
1572 search_tbl->ant_type = ANT_C;
1573
1574 if (!il4965_rs_is_valid_ant
1575 (valid_tx_ant, search_tbl->ant_type))
1576 break;
1577
1578 ret =
1579 il4965_rs_switch_to_siso(il, lq_sta, conf, sta,
1580 search_tbl, idx);
1581 if (!ret)
1582 goto out;
1583
1584 break;
1585
1586 case IL_MIMO2_SWITCH_GI:
1587 if (!tbl->is_ht40 &&
1588 !(ht_cap->cap & IEEE80211_HT_CAP_SGI_20))
1589 break;
1590 if (tbl->is_ht40 &&
1591 !(ht_cap->cap & IEEE80211_HT_CAP_SGI_40))
1592 break;
1593
1594 D_RATE("LQ: MIMO2 toggle SGI/NGI\n");
1595
1596 /* Set up new search table for MIMO2 */
1597 memcpy(search_tbl, tbl, sz);
1598 search_tbl->is_SGI = !tbl->is_SGI;
1599 il4965_rs_set_expected_tpt_table(lq_sta, search_tbl);
1600 /*
1601 * If active table already uses the fastest possible
1602 * modulation (dual stream with short guard interval),
1603 * and it's working well, there's no need to look
1604 * for a better type of modulation!
1605 */
1606 if (tbl->is_SGI) {
1607 s32 tpt = lq_sta->last_tpt / 100;
1608 if (tpt >= search_tbl->expected_tpt[idx])
1609 break;
1610 }
1611 search_tbl->current_rate =
1612 il4965_rate_n_flags_from_tbl(il, search_tbl, idx,
1613 is_green);
1614 update_search_tbl_counter = 1;
1615 goto out;
1616
1617 }
1618 tbl->action++;
1619 if (tbl->action > IL_MIMO2_SWITCH_GI)
1620 tbl->action = IL_MIMO2_SWITCH_ANTENNA1;
1621
1622 if (tbl->action == start_action)
1623 break;
1624 }
1625 search_tbl->lq_type = LQ_NONE;
1626 return 0;
1627out:
1628 lq_sta->search_better_tbl = 1;
1629 tbl->action++;
1630 if (tbl->action > IL_MIMO2_SWITCH_GI)
1631 tbl->action = IL_MIMO2_SWITCH_ANTENNA1;
1632 if (update_search_tbl_counter)
1633 search_tbl->action = tbl->action;
1634
1635 return 0;
1636
1637}
1638
1639/*
1640 * Check whether we should continue using same modulation mode, or
1641 * begin search for a new mode, based on:
1642 * 1) # tx successes or failures while using this mode
1643 * 2) # times calling this function
1644 * 3) elapsed time in this mode (not used, for now)
1645 */
1646static void
1647il4965_rs_stay_in_table(struct il_lq_sta *lq_sta, bool force_search)
1648{
1649 struct il_scale_tbl_info *tbl;
1650 int i;
1651 int active_tbl;
1652 int flush_interval_passed = 0;
1653 struct il_priv *il;
1654
1655 il = lq_sta->drv;
1656 active_tbl = lq_sta->active_tbl;
1657
1658 tbl = &(lq_sta->lq_info[active_tbl]);
1659
1660 /* If we've been disallowing search, see if we should now allow it */
1661 if (lq_sta->stay_in_tbl) {
1662
1663 /* Elapsed time using current modulation mode */
1664 if (lq_sta->flush_timer)
1665 flush_interval_passed =
1666 time_after(jiffies,
1667 (unsigned long)(lq_sta->flush_timer +
1668 RATE_SCALE_FLUSH_INTVL));
1669
1670 /*
1671 * Check if we should allow search for new modulation mode.
1672 * If many frames have failed or succeeded, or we've used
1673 * this same modulation for a long time, allow search, and
1674 * reset history stats that keep track of whether we should
1675 * allow a new search. Also (below) reset all bitmaps and
1676 * stats in active history.
1677 */
1678 if (force_search ||
1679 lq_sta->total_failed > lq_sta->max_failure_limit ||
1680 lq_sta->total_success > lq_sta->max_success_limit ||
1681 (!lq_sta->search_better_tbl && lq_sta->flush_timer &&
1682 flush_interval_passed)) {
1683 D_RATE("LQ: stay is expired %d %d %d\n:",
1684 lq_sta->total_failed, lq_sta->total_success,
1685 flush_interval_passed);
1686
1687 /* Allow search for new mode */
1688 lq_sta->stay_in_tbl = 0; /* only place reset */
1689 lq_sta->total_failed = 0;
1690 lq_sta->total_success = 0;
1691 lq_sta->flush_timer = 0;
1692
1693 /*
1694 * Else if we've used this modulation mode enough repetitions
1695 * (regardless of elapsed time or success/failure), reset
1696 * history bitmaps and rate-specific stats for all rates in
1697 * active table.
1698 */
1699 } else {
1700 lq_sta->table_count++;
1701 if (lq_sta->table_count >= lq_sta->table_count_limit) {
1702 lq_sta->table_count = 0;
1703
1704 D_RATE("LQ: stay in table clear win\n");
1705 for (i = 0; i < RATE_COUNT; i++)
1706 il4965_rs_rate_scale_clear_win(&
1707 (tbl->
1708 win
1709 [i]));
1710 }
1711 }
1712
1713 /* If transitioning to allow "search", reset all history
1714 * bitmaps and stats in active table (this will become the new
1715 * "search" table). */
1716 if (!lq_sta->stay_in_tbl) {
1717 for (i = 0; i < RATE_COUNT; i++)
1718 il4965_rs_rate_scale_clear_win(&(tbl->win[i]));
1719 }
1720 }
1721}
1722
1723/*
1724 * setup rate table in uCode
1725 */
1726static void
1727il4965_rs_update_rate_tbl(struct il_priv *il, struct il_lq_sta *lq_sta,
1728 struct il_scale_tbl_info *tbl, int idx, u8 is_green)
1729{
1730 u32 rate;
1731
1732 /* Update uCode's rate table. */
1733 rate = il4965_rate_n_flags_from_tbl(il, tbl, idx, is_green);
1734 il4965_rs_fill_link_cmd(il, lq_sta, rate);
1735 il_send_lq_cmd(il, &lq_sta->lq, CMD_ASYNC, false);
1736}
1737
1738/*
1739 * Do rate scaling and search for new modulation mode.
1740 */
1741static void
1742il4965_rs_rate_scale_perform(struct il_priv *il, struct sk_buff *skb,
1743 struct ieee80211_sta *sta,
1744 struct il_lq_sta *lq_sta)
1745{
1746 struct ieee80211_hw *hw = il->hw;
1747 struct ieee80211_conf *conf = &hw->conf;
1748 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1749 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1750 int low = RATE_INVALID;
1751 int high = RATE_INVALID;
1752 int idx;
1753 int i;
1754 struct il_rate_scale_data *win = NULL;
1755 int current_tpt = IL_INVALID_VALUE;
1756 int low_tpt = IL_INVALID_VALUE;
1757 int high_tpt = IL_INVALID_VALUE;
1758 u32 fail_count;
1759 s8 scale_action = 0;
1760 u16 rate_mask;
1761 u8 update_lq = 0;
1762 struct il_scale_tbl_info *tbl, *tbl1;
1763 u16 rate_scale_idx_msk = 0;
1764 u8 is_green = 0;
1765 u8 active_tbl = 0;
1766 u8 done_search = 0;
1767 u16 high_low;
1768 s32 sr;
1769 u8 tid = MAX_TID_COUNT;
1770 struct il_tid_data *tid_data;
1771
1772 D_RATE("rate scale calculate new rate for skb\n");
1773
1774 /* Send management frames and NO_ACK data using lowest rate. */
1775 /* TODO: this could probably be improved.. */
1776 if (!ieee80211_is_data(hdr->frame_control) ||
1777 (info->flags & IEEE80211_TX_CTL_NO_ACK))
1778 return;
1779
1780 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
1781
1782 tid = il4965_rs_tl_add_packet(lq_sta, hdr);
1783 if (tid != MAX_TID_COUNT && (lq_sta->tx_agg_tid_en & (1 << tid))) {
1784 tid_data = &il->stations[lq_sta->lq.sta_id].tid[tid];
1785 if (tid_data->agg.state == IL_AGG_OFF)
1786 lq_sta->is_agg = 0;
1787 else
1788 lq_sta->is_agg = 1;
1789 } else
1790 lq_sta->is_agg = 0;
1791
1792 /*
1793 * Select rate-scale / modulation-mode table to work with in
1794 * the rest of this function: "search" if searching for better
1795 * modulation mode, or "active" if doing rate scaling within a mode.
1796 */
1797 if (!lq_sta->search_better_tbl)
1798 active_tbl = lq_sta->active_tbl;
1799 else
1800 active_tbl = 1 - lq_sta->active_tbl;
1801
1802 tbl = &(lq_sta->lq_info[active_tbl]);
1803 if (is_legacy(tbl->lq_type))
1804 lq_sta->is_green = 0;
1805 else
1806 lq_sta->is_green = il4965_rs_use_green(il, sta);
1807 is_green = lq_sta->is_green;
1808
1809 /* current tx rate */
1810 idx = lq_sta->last_txrate_idx;
1811
1812 D_RATE("Rate scale idx %d for type %d\n", idx, tbl->lq_type);
1813
1814 /* rates available for this association, and for modulation mode */
1815 rate_mask = il4965_rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
1816
1817 D_RATE("mask 0x%04X\n", rate_mask);
1818
1819 /* mask with station rate restriction */
1820 if (is_legacy(tbl->lq_type)) {
1821 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1822 /* supp_rates has no CCK bits in A mode */
1823 rate_scale_idx_msk =
1824 (u16) (rate_mask &
1825 (lq_sta->supp_rates << IL_FIRST_OFDM_RATE));
1826 else
1827 rate_scale_idx_msk =
1828 (u16) (rate_mask & lq_sta->supp_rates);
1829
1830 } else
1831 rate_scale_idx_msk = rate_mask;
1832
1833 if (!rate_scale_idx_msk)
1834 rate_scale_idx_msk = rate_mask;
1835
1836 if (!((1 << idx) & rate_scale_idx_msk)) {
1837 IL_ERR("Current Rate is not valid\n");
1838 if (lq_sta->search_better_tbl) {
1839 /* revert to active table if search table is not valid */
1840 tbl->lq_type = LQ_NONE;
1841 lq_sta->search_better_tbl = 0;
1842 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1843 /* get "active" rate info */
1844 idx = il4965_hwrate_to_plcp_idx(tbl->current_rate);
1845 il4965_rs_update_rate_tbl(il, lq_sta, tbl, idx,
1846 is_green);
1847 }
1848 return;
1849 }
1850
1851 /* Get expected throughput table and history win for current rate */
1852 if (!tbl->expected_tpt) {
1853 IL_ERR("tbl->expected_tpt is NULL\n");
1854 return;
1855 }
1856
1857 /* force user max rate if set by user */
1858 if (lq_sta->max_rate_idx != -1 && lq_sta->max_rate_idx < idx) {
1859 idx = lq_sta->max_rate_idx;
1860 update_lq = 1;
1861 win = &(tbl->win[idx]);
1862 goto lq_update;
1863 }
1864
1865 win = &(tbl->win[idx]);
1866
1867 /*
1868 * If there is not enough history to calculate actual average
1869 * throughput, keep analyzing results of more tx frames, without
1870 * changing rate or mode (bypass most of the rest of this function).
1871 * Set up new rate table in uCode only if old rate is not supported
1872 * in current association (use new rate found above).
1873 */
1874 fail_count = win->counter - win->success_counter;
1875 if (fail_count < RATE_MIN_FAILURE_TH &&
1876 win->success_counter < RATE_MIN_SUCCESS_TH) {
1877 D_RATE("LQ: still below TH. succ=%d total=%d " "for idx %d\n",
1878 win->success_counter, win->counter, idx);
1879
1880 /* Can't calculate this yet; not enough history */
1881 win->average_tpt = IL_INVALID_VALUE;
1882
1883 /* Should we stay with this modulation mode,
1884 * or search for a new one? */
1885 il4965_rs_stay_in_table(lq_sta, false);
1886
1887 goto out;
1888 }
1889 /* Else we have enough samples; calculate estimate of
1890 * actual average throughput */
1891 if (win->average_tpt !=
1892 ((win->success_ratio * tbl->expected_tpt[idx] + 64) / 128)) {
1893 IL_ERR("expected_tpt should have been calculated by now\n");
1894 win->average_tpt =
1895 ((win->success_ratio * tbl->expected_tpt[idx] + 64) / 128);
1896 }
1897
1898 /* If we are searching for better modulation mode, check success. */
1899 if (lq_sta->search_better_tbl) {
1900 /* If good success, continue using the "search" mode;
1901 * no need to send new link quality command, since we're
1902 * continuing to use the setup that we've been trying. */
1903 if (win->average_tpt > lq_sta->last_tpt) {
1904
1905 D_RATE("LQ: SWITCHING TO NEW TBL "
1906 "suc=%d cur-tpt=%d old-tpt=%d\n",
1907 win->success_ratio, win->average_tpt,
1908 lq_sta->last_tpt);
1909
1910 if (!is_legacy(tbl->lq_type))
1911 lq_sta->enable_counter = 1;
1912
1913 /* Swap tables; "search" becomes "active" */
1914 lq_sta->active_tbl = active_tbl;
1915 current_tpt = win->average_tpt;
1916
1917 /* Else poor success; go back to mode in "active" table */
1918 } else {
1919
1920 D_RATE("LQ: GOING BACK TO THE OLD TBL "
1921 "suc=%d cur-tpt=%d old-tpt=%d\n",
1922 win->success_ratio, win->average_tpt,
1923 lq_sta->last_tpt);
1924
1925 /* Nullify "search" table */
1926 tbl->lq_type = LQ_NONE;
1927
1928 /* Revert to "active" table */
1929 active_tbl = lq_sta->active_tbl;
1930 tbl = &(lq_sta->lq_info[active_tbl]);
1931
1932 /* Revert to "active" rate and throughput info */
1933 idx = il4965_hwrate_to_plcp_idx(tbl->current_rate);
1934 current_tpt = lq_sta->last_tpt;
1935
1936 /* Need to set up a new rate table in uCode */
1937 update_lq = 1;
1938 }
1939
1940 /* Either way, we've made a decision; modulation mode
1941 * search is done, allow rate adjustment next time. */
1942 lq_sta->search_better_tbl = 0;
1943 done_search = 1; /* Don't switch modes below! */
1944 goto lq_update;
1945 }
1946
1947 /* (Else) not in search of better modulation mode, try for better
1948 * starting rate, while staying in this mode. */
1949 high_low =
1950 il4965_rs_get_adjacent_rate(il, idx, rate_scale_idx_msk,
1951 tbl->lq_type);
1952 low = high_low & 0xff;
1953 high = (high_low >> 8) & 0xff;
1954
1955 /* If user set max rate, dont allow higher than user constrain */
1956 if (lq_sta->max_rate_idx != -1 && lq_sta->max_rate_idx < high)
1957 high = RATE_INVALID;
1958
1959 sr = win->success_ratio;
1960
1961 /* Collect measured throughputs for current and adjacent rates */
1962 current_tpt = win->average_tpt;
1963 if (low != RATE_INVALID)
1964 low_tpt = tbl->win[low].average_tpt;
1965 if (high != RATE_INVALID)
1966 high_tpt = tbl->win[high].average_tpt;
1967
1968 scale_action = 0;
1969
1970 /* Too many failures, decrease rate */
1971 if (sr <= RATE_DECREASE_TH || current_tpt == 0) {
1972 D_RATE("decrease rate because of low success_ratio\n");
1973 scale_action = -1;
1974
1975 /* No throughput measured yet for adjacent rates; try increase. */
1976 } else if (low_tpt == IL_INVALID_VALUE && high_tpt == IL_INVALID_VALUE) {
1977
1978 if (high != RATE_INVALID && sr >= RATE_INCREASE_TH)
1979 scale_action = 1;
1980 else if (low != RATE_INVALID)
1981 scale_action = 0;
1982 }
1983
1984 /* Both adjacent throughputs are measured, but neither one has better
1985 * throughput; we're using the best rate, don't change it! */
1986 else if (low_tpt != IL_INVALID_VALUE && high_tpt != IL_INVALID_VALUE &&
1987 low_tpt < current_tpt && high_tpt < current_tpt)
1988 scale_action = 0;
1989
1990 /* At least one adjacent rate's throughput is measured,
1991 * and may have better performance. */
1992 else {
1993 /* Higher adjacent rate's throughput is measured */
1994 if (high_tpt != IL_INVALID_VALUE) {
1995 /* Higher rate has better throughput */
1996 if (high_tpt > current_tpt && sr >= RATE_INCREASE_TH)
1997 scale_action = 1;
1998 else
1999 scale_action = 0;
2000
2001 /* Lower adjacent rate's throughput is measured */
2002 } else if (low_tpt != IL_INVALID_VALUE) {
2003 /* Lower rate has better throughput */
2004 if (low_tpt > current_tpt) {
2005 D_RATE("decrease rate because of low tpt\n");
2006 scale_action = -1;
2007 } else if (sr >= RATE_INCREASE_TH) {
2008 scale_action = 1;
2009 }
2010 }
2011 }
2012
2013 /* Sanity check; asked for decrease, but success rate or throughput
2014 * has been good at old rate. Don't change it. */
2015 if (scale_action == -1 && low != RATE_INVALID &&
2016 (sr > RATE_HIGH_TH || current_tpt > 100 * tbl->expected_tpt[low]))
2017 scale_action = 0;
2018
2019 switch (scale_action) {
2020 case -1:
2021 /* Decrease starting rate, update uCode's rate table */
2022 if (low != RATE_INVALID) {
2023 update_lq = 1;
2024 idx = low;
2025 }
2026
2027 break;
2028 case 1:
2029 /* Increase starting rate, update uCode's rate table */
2030 if (high != RATE_INVALID) {
2031 update_lq = 1;
2032 idx = high;
2033 }
2034
2035 break;
2036 case 0:
2037 /* No change */
2038 default:
2039 break;
2040 }
2041
2042 D_RATE("choose rate scale idx %d action %d low %d " "high %d type %d\n",
2043 idx, scale_action, low, high, tbl->lq_type);
2044
2045lq_update:
2046 /* Replace uCode's rate table for the destination station. */
2047 if (update_lq)
2048 il4965_rs_update_rate_tbl(il, lq_sta, tbl, idx, is_green);
2049
2050 /* Should we stay with this modulation mode,
2051 * or search for a new one? */
2052 il4965_rs_stay_in_table(lq_sta, false);
2053
2054 /*
2055 * Search for new modulation mode if we're:
2056 * 1) Not changing rates right now
2057 * 2) Not just finishing up a search
2058 * 3) Allowing a new search
2059 */
2060 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && win->counter) {
2061 /* Save current throughput to compare with "search" throughput */
2062 lq_sta->last_tpt = current_tpt;
2063
2064 /* Select a new "search" modulation mode to try.
2065 * If one is found, set up the new "search" table. */
2066 if (is_legacy(tbl->lq_type))
2067 il4965_rs_move_legacy_other(il, lq_sta, conf, sta, idx);
2068 else if (is_siso(tbl->lq_type))
2069 il4965_rs_move_siso_to_other(il, lq_sta, conf, sta,
2070 idx);
2071 else /* (is_mimo2(tbl->lq_type)) */
2072 il4965_rs_move_mimo2_to_other(il, lq_sta, conf, sta,
2073 idx);
2074
2075 /* If new "search" mode was selected, set up in uCode table */
2076 if (lq_sta->search_better_tbl) {
2077 /* Access the "search" table, clear its history. */
2078 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2079 for (i = 0; i < RATE_COUNT; i++)
2080 il4965_rs_rate_scale_clear_win(&(tbl->win[i]));
2081
2082 /* Use new "search" start rate */
2083 idx = il4965_hwrate_to_plcp_idx(tbl->current_rate);
2084
2085 D_RATE("Switch current mcs: %X idx: %d\n",
2086 tbl->current_rate, idx);
2087 il4965_rs_fill_link_cmd(il, lq_sta, tbl->current_rate);
2088 il_send_lq_cmd(il, &lq_sta->lq, CMD_ASYNC, false);
2089 } else
2090 done_search = 1;
2091 }
2092
2093 if (done_search && !lq_sta->stay_in_tbl) {
2094 /* If the "active" (non-search) mode was legacy,
2095 * and we've tried switching antennas,
2096 * but we haven't been able to try HT modes (not available),
2097 * stay with best antenna legacy modulation for a while
2098 * before next round of mode comparisons. */
2099 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2100 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2101 lq_sta->action_counter > tbl1->max_search) {
2102 D_RATE("LQ: STAY in legacy table\n");
2103 il4965_rs_set_stay_in_table(il, 1, lq_sta);
2104 }
2105
2106 /* If we're in an HT mode, and all 3 mode switch actions
2107 * have been tried and compared, stay in this best modulation
2108 * mode for a while before next round of mode comparisons. */
2109 if (lq_sta->enable_counter &&
2110 lq_sta->action_counter >= tbl1->max_search) {
2111 if (lq_sta->last_tpt > IL_AGG_TPT_THREHOLD &&
2112 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2113 tid != MAX_TID_COUNT) {
2114 tid_data =
2115 &il->stations[lq_sta->lq.sta_id].tid[tid];
2116 if (tid_data->agg.state == IL_AGG_OFF) {
2117 D_RATE("try to aggregate tid %d\n",
2118 tid);
2119 il4965_rs_tl_turn_on_agg(il, tid,
2120 lq_sta, sta);
2121 }
2122 }
2123 il4965_rs_set_stay_in_table(il, 0, lq_sta);
2124 }
2125 }
2126
2127out:
2128 tbl->current_rate =
2129 il4965_rate_n_flags_from_tbl(il, tbl, idx, is_green);
2130 i = idx;
2131 lq_sta->last_txrate_idx = i;
2132}
2133
2134/**
2135 * il4965_rs_initialize_lq - Initialize a station's hardware rate table
2136 *
2137 * The uCode's station table contains a table of fallback rates
2138 * for automatic fallback during transmission.
2139 *
2140 * NOTE: This sets up a default set of values. These will be replaced later
2141 * if the driver's iwl-4965-rs rate scaling algorithm is used, instead of
2142 * rc80211_simple.
2143 *
2144 * NOTE: Run C_ADD_STA command to set up station table entry, before
2145 * calling this function (which runs C_TX_LINK_QUALITY_CMD,
2146 * which requires station table entry to exist).
2147 */
2148static void
2149il4965_rs_initialize_lq(struct il_priv *il, struct ieee80211_conf *conf,
2150 struct ieee80211_sta *sta, struct il_lq_sta *lq_sta)
2151{
2152 struct il_scale_tbl_info *tbl;
2153 int rate_idx;
2154 int i;
2155 u32 rate;
2156 u8 use_green = il4965_rs_use_green(il, sta);
2157 u8 active_tbl = 0;
2158 u8 valid_tx_ant;
2159 struct il_station_priv *sta_priv;
2160
2161 if (!sta || !lq_sta)
2162 return;
2163
2164 sta_priv = (void *)sta->drv_priv;
2165
2166 i = lq_sta->last_txrate_idx;
2167
2168 valid_tx_ant = il->hw_params.valid_tx_ant;
2169
2170 if (!lq_sta->search_better_tbl)
2171 active_tbl = lq_sta->active_tbl;
2172 else
2173 active_tbl = 1 - lq_sta->active_tbl;
2174
2175 tbl = &(lq_sta->lq_info[active_tbl]);
2176
2177 if (i < 0 || i >= RATE_COUNT)
2178 i = 0;
2179
2180 rate = il_rates[i].plcp;
2181 tbl->ant_type = il4965_first_antenna(valid_tx_ant);
2182 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2183
2184 if (i >= IL_FIRST_CCK_RATE && i <= IL_LAST_CCK_RATE)
2185 rate |= RATE_MCS_CCK_MSK;
2186
2187 il4965_rs_get_tbl_info_from_mcs(rate, il->band, tbl, &rate_idx);
2188 if (!il4965_rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2189 il4965_rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2190
2191 rate = il4965_rate_n_flags_from_tbl(il, tbl, rate_idx, use_green);
2192 tbl->current_rate = rate;
2193 il4965_rs_set_expected_tpt_table(lq_sta, tbl);
2194 il4965_rs_fill_link_cmd(NULL, lq_sta, rate);
2195 il->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2196 il_send_lq_cmd(il, &lq_sta->lq, CMD_SYNC, true);
2197}
2198
2199static void
2200il4965_rs_get_rate(void *il_r, struct ieee80211_sta *sta, void *il_sta,
2201 struct ieee80211_tx_rate_control *txrc)
2202{
2203
2204 struct sk_buff *skb = txrc->skb;
2205 struct ieee80211_supported_band *sband = txrc->sband;
2206 struct il_priv *il __maybe_unused = (struct il_priv *)il_r;
2207 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2208 struct il_lq_sta *lq_sta = il_sta;
2209 int rate_idx;
2210
2211 D_RATE("rate scale calculate new rate for skb\n");
2212
2213 /* Get max rate if user set max rate */
2214 if (lq_sta) {
2215 lq_sta->max_rate_idx = txrc->max_rate_idx;
2216 if (sband->band == IEEE80211_BAND_5GHZ &&
2217 lq_sta->max_rate_idx != -1)
2218 lq_sta->max_rate_idx += IL_FIRST_OFDM_RATE;
2219 if (lq_sta->max_rate_idx < 0 ||
2220 lq_sta->max_rate_idx >= RATE_COUNT)
2221 lq_sta->max_rate_idx = -1;
2222 }
2223
2224 /* Treat uninitialized rate scaling data same as non-existing. */
2225 if (lq_sta && !lq_sta->drv) {
2226 D_RATE("Rate scaling not initialized yet.\n");
2227 il_sta = NULL;
2228 }
2229
2230 /* Send management frames and NO_ACK data using lowest rate. */
2231 if (rate_control_send_low(sta, il_sta, txrc))
2232 return;
2233
2234 if (!lq_sta)
2235 return;
2236
2237 rate_idx = lq_sta->last_txrate_idx;
2238
2239 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2240 rate_idx -= IL_FIRST_OFDM_RATE;
2241 /* 6M and 9M shared same MCS idx */
2242 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2243 if (il4965_rs_extract_rate(lq_sta->last_rate_n_flags) >=
2244 RATE_MIMO2_6M_PLCP)
2245 rate_idx = rate_idx + MCS_IDX_PER_STREAM;
2246 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2247 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2248 info->control.rates[0].flags |=
2249 IEEE80211_TX_RC_SHORT_GI;
2250 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2251 info->control.rates[0].flags |=
2252 IEEE80211_TX_RC_DUP_DATA;
2253 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2254 info->control.rates[0].flags |=
2255 IEEE80211_TX_RC_40_MHZ_WIDTH;
2256 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2257 info->control.rates[0].flags |=
2258 IEEE80211_TX_RC_GREEN_FIELD;
2259 } else {
2260 /* Check for invalid rates */
2261 if (rate_idx < 0 || rate_idx >= RATE_COUNT_LEGACY ||
2262 (sband->band == IEEE80211_BAND_5GHZ &&
2263 rate_idx < IL_FIRST_OFDM_RATE))
2264 rate_idx = rate_lowest_index(sband, sta);
2265 /* On valid 5 GHz rate, adjust idx */
2266 else if (sband->band == IEEE80211_BAND_5GHZ)
2267 rate_idx -= IL_FIRST_OFDM_RATE;
2268 info->control.rates[0].flags = 0;
2269 }
2270 info->control.rates[0].idx = rate_idx;
2271
2272}
2273
2274static void *
2275il4965_rs_alloc_sta(void *il_rate, struct ieee80211_sta *sta, gfp_t gfp)
2276{
2277 struct il_station_priv *sta_priv =
2278 (struct il_station_priv *)sta->drv_priv;
2279 struct il_priv *il;
2280
2281 il = (struct il_priv *)il_rate;
2282 D_RATE("create station rate scale win\n");
2283
2284 return &sta_priv->lq_sta;
2285}
2286
2287/*
2288 * Called after adding a new station to initialize rate scaling
2289 */
2290void
2291il4965_rs_rate_init(struct il_priv *il, struct ieee80211_sta *sta, u8 sta_id)
2292{
2293 int i, j;
2294 struct ieee80211_hw *hw = il->hw;
2295 struct ieee80211_conf *conf = &il->hw->conf;
2296 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2297 struct il_station_priv *sta_priv;
2298 struct il_lq_sta *lq_sta;
2299 struct ieee80211_supported_band *sband;
2300
2301 sta_priv = (struct il_station_priv *)sta->drv_priv;
2302 lq_sta = &sta_priv->lq_sta;
2303 sband = hw->wiphy->bands[conf->channel->band];
2304
2305 lq_sta->lq.sta_id = sta_id;
2306
2307 for (j = 0; j < LQ_SIZE; j++)
2308 for (i = 0; i < RATE_COUNT; i++)
2309 il4965_rs_rate_scale_clear_win(&lq_sta->lq_info[j].
2310 win[i]);
2311
2312 lq_sta->flush_timer = 0;
2313 lq_sta->supp_rates = sta->supp_rates[sband->band];
2314 for (j = 0; j < LQ_SIZE; j++)
2315 for (i = 0; i < RATE_COUNT; i++)
2316 il4965_rs_rate_scale_clear_win(&lq_sta->lq_info[j].
2317 win[i]);
2318
2319 D_RATE("LQ:" "*** rate scale station global init for station %d ***\n",
2320 sta_id);
2321 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2322 * the lowest or the highest rate.. Could consider using RSSI from
2323 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2324 * after assoc.. */
2325
2326 lq_sta->is_dup = 0;
2327 lq_sta->max_rate_idx = -1;
2328 lq_sta->missed_rate_counter = IL_MISSED_RATE_MAX;
2329 lq_sta->is_green = il4965_rs_use_green(il, sta);
2330 lq_sta->active_legacy_rate = il->active_rate & ~(0x1000);
2331 lq_sta->band = il->band;
2332 /*
2333 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2334 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2335 */
2336 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2337 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2338 lq_sta->active_siso_rate &= ~((u16) 0x2);
2339 lq_sta->active_siso_rate <<= IL_FIRST_OFDM_RATE;
2340
2341 /* Same here */
2342 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2343 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2344 lq_sta->active_mimo2_rate &= ~((u16) 0x2);
2345 lq_sta->active_mimo2_rate <<= IL_FIRST_OFDM_RATE;
2346
2347 /* These values will be overridden later */
2348 lq_sta->lq.general_params.single_stream_ant_msk =
2349 il4965_first_antenna(il->hw_params.valid_tx_ant);
2350 lq_sta->lq.general_params.dual_stream_ant_msk =
2351 il->hw_params.valid_tx_ant & ~il4965_first_antenna(il->hw_params.
2352 valid_tx_ant);
2353 if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2354 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2355 } else if (il4965_num_of_ant(il->hw_params.valid_tx_ant) == 2) {
2356 lq_sta->lq.general_params.dual_stream_ant_msk =
2357 il->hw_params.valid_tx_ant;
2358 }
2359
2360 /* as default allow aggregation for all tids */
2361 lq_sta->tx_agg_tid_en = IL_AGG_ALL_TID;
2362 lq_sta->drv = il;
2363
2364 /* Set last_txrate_idx to lowest rate */
2365 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2366 if (sband->band == IEEE80211_BAND_5GHZ)
2367 lq_sta->last_txrate_idx += IL_FIRST_OFDM_RATE;
2368 lq_sta->is_agg = 0;
2369
2370#ifdef CONFIG_MAC80211_DEBUGFS
2371 lq_sta->dbg_fixed_rate = 0;
2372#endif
2373
2374 il4965_rs_initialize_lq(il, conf, sta, lq_sta);
2375}
2376
2377static void
2378il4965_rs_fill_link_cmd(struct il_priv *il, struct il_lq_sta *lq_sta,
2379 u32 new_rate)
2380{
2381 struct il_scale_tbl_info tbl_type;
2382 int idx = 0;
2383 int rate_idx;
2384 int repeat_rate = 0;
2385 u8 ant_toggle_cnt = 0;
2386 u8 use_ht_possible = 1;
2387 u8 valid_tx_ant = 0;
2388 struct il_link_quality_cmd *lq_cmd = &lq_sta->lq;
2389
2390 /* Override starting rate (idx 0) if needed for debug purposes */
2391 il4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, idx);
2392
2393 /* Interpret new_rate (rate_n_flags) */
2394 il4965_rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2395 &rate_idx);
2396
2397 /* How many times should we repeat the initial rate? */
2398 if (is_legacy(tbl_type.lq_type)) {
2399 ant_toggle_cnt = 1;
2400 repeat_rate = IL_NUMBER_TRY;
2401 } else {
2402 repeat_rate = IL_HT_NUMBER_TRY;
2403 }
2404
2405 lq_cmd->general_params.mimo_delimiter =
2406 is_mimo(tbl_type.lq_type) ? 1 : 0;
2407
2408 /* Fill 1st table entry (idx 0) */
2409 lq_cmd->rs_table[idx].rate_n_flags = cpu_to_le32(new_rate);
2410
2411 if (il4965_num_of_ant(tbl_type.ant_type) == 1) {
2412 lq_cmd->general_params.single_stream_ant_msk =
2413 tbl_type.ant_type;
2414 } else if (il4965_num_of_ant(tbl_type.ant_type) == 2) {
2415 lq_cmd->general_params.dual_stream_ant_msk = tbl_type.ant_type;
2416 }
2417 /* otherwise we don't modify the existing value */
2418 idx++;
2419 repeat_rate--;
2420 if (il)
2421 valid_tx_ant = il->hw_params.valid_tx_ant;
2422
2423 /* Fill rest of rate table */
2424 while (idx < LINK_QUAL_MAX_RETRY_NUM) {
2425 /* Repeat initial/next rate.
2426 * For legacy IL_NUMBER_TRY == 1, this loop will not execute.
2427 * For HT IL_HT_NUMBER_TRY == 3, this executes twice. */
2428 while (repeat_rate > 0 && idx < LINK_QUAL_MAX_RETRY_NUM) {
2429 if (is_legacy(tbl_type.lq_type)) {
2430 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2431 ant_toggle_cnt++;
2432 else if (il &&
2433 il4965_rs_toggle_antenna(valid_tx_ant,
2434 &new_rate,
2435 &tbl_type))
2436 ant_toggle_cnt = 1;
2437 }
2438
2439 /* Override next rate if needed for debug purposes */
2440 il4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, idx);
2441
2442 /* Fill next table entry */
2443 lq_cmd->rs_table[idx].rate_n_flags =
2444 cpu_to_le32(new_rate);
2445 repeat_rate--;
2446 idx++;
2447 }
2448
2449 il4965_rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2450 &tbl_type, &rate_idx);
2451
2452 /* Indicate to uCode which entries might be MIMO.
2453 * If initial rate was MIMO, this will finally end up
2454 * as (IL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2455 if (is_mimo(tbl_type.lq_type))
2456 lq_cmd->general_params.mimo_delimiter = idx;
2457
2458 /* Get next rate */
2459 new_rate =
2460 il4965_rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2461 use_ht_possible);
2462
2463 /* How many times should we repeat the next rate? */
2464 if (is_legacy(tbl_type.lq_type)) {
2465 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2466 ant_toggle_cnt++;
2467 else if (il &&
2468 il4965_rs_toggle_antenna(valid_tx_ant,
2469 &new_rate, &tbl_type))
2470 ant_toggle_cnt = 1;
2471
2472 repeat_rate = IL_NUMBER_TRY;
2473 } else {
2474 repeat_rate = IL_HT_NUMBER_TRY;
2475 }
2476
2477 /* Don't allow HT rates after next pass.
2478 * il4965_rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2479 use_ht_possible = 0;
2480
2481 /* Override next rate if needed for debug purposes */
2482 il4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, idx);
2483
2484 /* Fill next table entry */
2485 lq_cmd->rs_table[idx].rate_n_flags = cpu_to_le32(new_rate);
2486
2487 idx++;
2488 repeat_rate--;
2489 }
2490
2491 lq_cmd->agg_params.agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2492 lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2493
2494 lq_cmd->agg_params.agg_time_limit =
2495 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2496}
2497
2498static void *
2499il4965_rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2500{
2501 return hw->priv;
2502}
2503
2504/* rate scale requires free function to be implemented */
2505static void
2506il4965_rs_free(void *il_rate)
2507{
2508 return;
2509}
2510
2511static void
2512il4965_rs_free_sta(void *il_r, struct ieee80211_sta *sta, void *il_sta)
2513{
2514 struct il_priv *il __maybe_unused = il_r;
2515
2516 D_RATE("enter\n");
2517 D_RATE("leave\n");
2518}
2519
2520#ifdef CONFIG_MAC80211_DEBUGFS
2521
2522static void
2523il4965_rs_dbgfs_set_mcs(struct il_lq_sta *lq_sta, u32 * rate_n_flags, int idx)
2524{
2525 struct il_priv *il;
2526 u8 valid_tx_ant;
2527 u8 ant_sel_tx;
2528
2529 il = lq_sta->drv;
2530 valid_tx_ant = il->hw_params.valid_tx_ant;
2531 if (lq_sta->dbg_fixed_rate) {
2532 ant_sel_tx =
2533 ((lq_sta->
2534 dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK) >>
2535 RATE_MCS_ANT_POS);
2536 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
2537 *rate_n_flags = lq_sta->dbg_fixed_rate;
2538 D_RATE("Fixed rate ON\n");
2539 } else {
2540 lq_sta->dbg_fixed_rate = 0;
2541 IL_ERR
2542 ("Invalid antenna selection 0x%X, Valid is 0x%X\n",
2543 ant_sel_tx, valid_tx_ant);
2544 D_RATE("Fixed rate OFF\n");
2545 }
2546 } else {
2547 D_RATE("Fixed rate OFF\n");
2548 }
2549}
2550
2551static ssize_t
2552il4965_rs_sta_dbgfs_scale_table_write(struct file *file,
2553 const char __user *user_buf,
2554 size_t count, loff_t *ppos)
2555{
2556 struct il_lq_sta *lq_sta = file->private_data;
2557 struct il_priv *il;
2558 char buf[64];
2559 size_t buf_size;
2560 u32 parsed_rate;
2561
2562 il = lq_sta->drv;
2563 memset(buf, 0, sizeof(buf));
2564 buf_size = min(count, sizeof(buf) - 1);
2565 if (copy_from_user(buf, user_buf, buf_size))
2566 return -EFAULT;
2567
2568 if (sscanf(buf, "%x", &parsed_rate) == 1)
2569 lq_sta->dbg_fixed_rate = parsed_rate;
2570 else
2571 lq_sta->dbg_fixed_rate = 0;
2572
2573 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2574 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2575 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2576
2577 D_RATE("sta_id %d rate 0x%X\n", lq_sta->lq.sta_id,
2578 lq_sta->dbg_fixed_rate);
2579
2580 if (lq_sta->dbg_fixed_rate) {
2581 il4965_rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2582 il_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC, false);
2583 }
2584
2585 return count;
2586}
2587
2588static ssize_t
2589il4965_rs_sta_dbgfs_scale_table_read(struct file *file, char __user *user_buf,
2590 size_t count, loff_t *ppos)
2591{
2592 char *buff;
2593 int desc = 0;
2594 int i = 0;
2595 int idx = 0;
2596 ssize_t ret;
2597
2598 struct il_lq_sta *lq_sta = file->private_data;
2599 struct il_priv *il;
2600 struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2601
2602 il = lq_sta->drv;
2603 buff = kmalloc(1024, GFP_KERNEL);
2604 if (!buff)
2605 return -ENOMEM;
2606
2607 desc += sprintf(buff + desc, "sta_id %d\n", lq_sta->lq.sta_id);
2608 desc +=
2609 sprintf(buff + desc, "failed=%d success=%d rate=0%X\n",
2610 lq_sta->total_failed, lq_sta->total_success,
2611 lq_sta->active_legacy_rate);
2612 desc +=
2613 sprintf(buff + desc, "fixed rate 0x%X\n", lq_sta->dbg_fixed_rate);
2614 desc +=
2615 sprintf(buff + desc, "valid_tx_ant %s%s%s\n",
2616 (il->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
2617 (il->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
2618 (il->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
2619 desc +=
2620 sprintf(buff + desc, "lq type %s\n",
2621 (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
2622 if (is_Ht(tbl->lq_type)) {
2623 desc +=
2624 sprintf(buff + desc, " %s",
2625 (is_siso(tbl->lq_type)) ? "SISO" : "MIMO2");
2626 desc +=
2627 sprintf(buff + desc, " %s",
2628 (tbl->is_ht40) ? "40MHz" : "20MHz");
2629 desc +=
2630 sprintf(buff + desc, " %s %s %s\n",
2631 (tbl->is_SGI) ? "SGI" : "",
2632 (lq_sta->is_green) ? "GF enabled" : "",
2633 (lq_sta->is_agg) ? "AGG on" : "");
2634 }
2635 desc +=
2636 sprintf(buff + desc, "last tx rate=0x%X\n",
2637 lq_sta->last_rate_n_flags);
2638 desc +=
2639 sprintf(buff + desc,
2640 "general:" "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2641 lq_sta->lq.general_params.flags,
2642 lq_sta->lq.general_params.mimo_delimiter,
2643 lq_sta->lq.general_params.single_stream_ant_msk,
2644 lq_sta->lq.general_params.dual_stream_ant_msk);
2645
2646 desc +=
2647 sprintf(buff + desc,
2648 "agg:"
2649 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2650 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2651 lq_sta->lq.agg_params.agg_dis_start_th,
2652 lq_sta->lq.agg_params.agg_frame_cnt_limit);
2653
2654 desc +=
2655 sprintf(buff + desc,
2656 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2657 lq_sta->lq.general_params.start_rate_idx[0],
2658 lq_sta->lq.general_params.start_rate_idx[1],
2659 lq_sta->lq.general_params.start_rate_idx[2],
2660 lq_sta->lq.general_params.start_rate_idx[3]);
2661
2662 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2663 idx =
2664 il4965_hwrate_to_plcp_idx(le32_to_cpu
2665 (lq_sta->lq.rs_table[i].
2666 rate_n_flags));
2667 if (is_legacy(tbl->lq_type)) {
2668 desc +=
2669 sprintf(buff + desc, " rate[%d] 0x%X %smbps\n", i,
2670 le32_to_cpu(lq_sta->lq.rs_table[i].
2671 rate_n_flags),
2672 il_rate_mcs[idx].mbps);
2673 } else {
2674 desc +=
2675 sprintf(buff + desc, " rate[%d] 0x%X %smbps (%s)\n",
2676 i,
2677 le32_to_cpu(lq_sta->lq.rs_table[i].
2678 rate_n_flags),
2679 il_rate_mcs[idx].mbps,
2680 il_rate_mcs[idx].mcs);
2681 }
2682 }
2683
2684 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2685 kfree(buff);
2686 return ret;
2687}
2688
2689static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2690 .write = il4965_rs_sta_dbgfs_scale_table_write,
2691 .read = il4965_rs_sta_dbgfs_scale_table_read,
2692 .open = simple_open,
2693 .llseek = default_llseek,
2694};
2695
2696static ssize_t
2697il4965_rs_sta_dbgfs_stats_table_read(struct file *file, char __user *user_buf,
2698 size_t count, loff_t *ppos)
2699{
2700 char *buff;
2701 int desc = 0;
2702 int i, j;
2703 ssize_t ret;
2704
2705 struct il_lq_sta *lq_sta = file->private_data;
2706
2707 buff = kmalloc(1024, GFP_KERNEL);
2708 if (!buff)
2709 return -ENOMEM;
2710
2711 for (i = 0; i < LQ_SIZE; i++) {
2712 desc +=
2713 sprintf(buff + desc,
2714 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
2715 "rate=0x%X\n", lq_sta->active_tbl == i ? "*" : "x",
2716 lq_sta->lq_info[i].lq_type,
2717 lq_sta->lq_info[i].is_SGI,
2718 lq_sta->lq_info[i].is_ht40,
2719 lq_sta->lq_info[i].is_dup, lq_sta->is_green,
2720 lq_sta->lq_info[i].current_rate);
2721 for (j = 0; j < RATE_COUNT; j++) {
2722 desc +=
2723 sprintf(buff + desc,
2724 "counter=%d success=%d %%=%d\n",
2725 lq_sta->lq_info[i].win[j].counter,
2726 lq_sta->lq_info[i].win[j].success_counter,
2727 lq_sta->lq_info[i].win[j].success_ratio);
2728 }
2729 }
2730 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2731 kfree(buff);
2732 return ret;
2733}
2734
2735static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2736 .read = il4965_rs_sta_dbgfs_stats_table_read,
2737 .open = simple_open,
2738 .llseek = default_llseek,
2739};
2740
2741static ssize_t
2742il4965_rs_sta_dbgfs_rate_scale_data_read(struct file *file,
2743 char __user *user_buf, size_t count,
2744 loff_t *ppos)
2745{
2746 char buff[120];
2747 int desc = 0;
2748 struct il_lq_sta *lq_sta = file->private_data;
2749 struct il_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
2750
2751 if (is_Ht(tbl->lq_type))
2752 desc +=
2753 sprintf(buff + desc, "Bit Rate= %d Mb/s\n",
2754 tbl->expected_tpt[lq_sta->last_txrate_idx]);
2755 else
2756 desc +=
2757 sprintf(buff + desc, "Bit Rate= %d Mb/s\n",
2758 il_rates[lq_sta->last_txrate_idx].ieee >> 1);
2759
2760 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2761}
2762
2763static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
2764 .read = il4965_rs_sta_dbgfs_rate_scale_data_read,
2765 .open = simple_open,
2766 .llseek = default_llseek,
2767};
2768
2769static void
2770il4965_rs_add_debugfs(void *il, void *il_sta, struct dentry *dir)
2771{
2772 struct il_lq_sta *lq_sta = il_sta;
2773 lq_sta->rs_sta_dbgfs_scale_table_file =
2774 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
2775 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2776 lq_sta->rs_sta_dbgfs_stats_table_file =
2777 debugfs_create_file("rate_stats_table", S_IRUSR, dir, lq_sta,
2778 &rs_sta_dbgfs_stats_table_ops);
2779 lq_sta->rs_sta_dbgfs_rate_scale_data_file =
2780 debugfs_create_file("rate_scale_data", S_IRUSR, dir, lq_sta,
2781 &rs_sta_dbgfs_rate_scale_data_ops);
2782 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2783 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
2784 &lq_sta->tx_agg_tid_en);
2785
2786}
2787
2788static void
2789il4965_rs_remove_debugfs(void *il, void *il_sta)
2790{
2791 struct il_lq_sta *lq_sta = il_sta;
2792 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2793 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2794 debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
2795 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2796}
2797#endif
2798
2799/*
2800 * Initialization of rate scaling information is done by driver after
2801 * the station is added. Since mac80211 calls this function before a
2802 * station is added we ignore it.
2803 */
2804static void
2805il4965_rs_rate_init_stub(void *il_r, struct ieee80211_supported_band *sband,
2806 struct ieee80211_sta *sta, void *il_sta)
2807{
2808}
2809
2810static struct rate_control_ops rs_4965_ops = {
2811 .module = NULL,
2812 .name = IL4965_RS_NAME,
2813 .tx_status = il4965_rs_tx_status,
2814 .get_rate = il4965_rs_get_rate,
2815 .rate_init = il4965_rs_rate_init_stub,
2816 .alloc = il4965_rs_alloc,
2817 .free = il4965_rs_free,
2818 .alloc_sta = il4965_rs_alloc_sta,
2819 .free_sta = il4965_rs_free_sta,
2820#ifdef CONFIG_MAC80211_DEBUGFS
2821 .add_sta_debugfs = il4965_rs_add_debugfs,
2822 .remove_sta_debugfs = il4965_rs_remove_debugfs,
2823#endif
2824};
2825
2826int
2827il4965_rate_control_register(void)
2828{
2829 return ieee80211_rate_control_register(&rs_4965_ops);
2830}
2831
2832void
2833il4965_rate_control_unregister(void)
2834{
2835 ieee80211_rate_control_unregister(&rs_4965_ops);
2836}