Loading...
Note: File does not exist in v6.8.
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 <linux/wireless.h>
31#include <net/mac80211.h>
32
33#include <linux/netdevice.h>
34#include <linux/etherdevice.h>
35#include <linux/delay.h>
36
37#include <linux/workqueue.h>
38
39#include "iwl-dev.h"
40#include "iwl-sta.h"
41#include "iwl-core.h"
42#include "iwl-4965.h"
43
44#define IWL4965_RS_NAME "iwl-4965-rs"
45
46#define NUM_TRY_BEFORE_ANT_TOGGLE 1
47#define IWL_NUMBER_TRY 1
48#define IWL_HT_NUMBER_TRY 3
49
50#define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
51#define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
52#define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
53
54/* max allowed rate miss before sync LQ cmd */
55#define IWL_MISSED_RATE_MAX 15
56/* max time to accum history 2 seconds */
57#define IWL_RATE_SCALE_FLUSH_INTVL (3*HZ)
58
59static u8 rs_ht_to_legacy[] = {
60 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
61 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
62 IWL_RATE_6M_INDEX,
63 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
64 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
65 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
66 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
67};
68
69static const u8 ant_toggle_lookup[] = {
70 /*ANT_NONE -> */ ANT_NONE,
71 /*ANT_A -> */ ANT_B,
72 /*ANT_B -> */ ANT_C,
73 /*ANT_AB -> */ ANT_BC,
74 /*ANT_C -> */ ANT_A,
75 /*ANT_AC -> */ ANT_AB,
76 /*ANT_BC -> */ ANT_AC,
77 /*ANT_ABC -> */ ANT_ABC,
78};
79
80#define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np) \
81 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
82 IWL_RATE_SISO_##s##M_PLCP, \
83 IWL_RATE_MIMO2_##s##M_PLCP,\
84 IWL_RATE_##r##M_IEEE, \
85 IWL_RATE_##ip##M_INDEX, \
86 IWL_RATE_##in##M_INDEX, \
87 IWL_RATE_##rp##M_INDEX, \
88 IWL_RATE_##rn##M_INDEX, \
89 IWL_RATE_##pp##M_INDEX, \
90 IWL_RATE_##np##M_INDEX }
91
92/*
93 * Parameter order:
94 * rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
95 *
96 * If there isn't a valid next or previous rate then INV is used which
97 * maps to IWL_RATE_INVALID
98 *
99 */
100const struct iwl_rate_info iwlegacy_rates[IWL_RATE_COUNT] = {
101 IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2), /* 1mbps */
102 IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5), /* 2mbps */
103 IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11), /*5.5mbps */
104 IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18), /* 11mbps */
105 IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11), /* 6mbps */
106 IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11), /* 9mbps */
107 IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18), /* 12mbps */
108 IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24), /* 18mbps */
109 IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36), /* 24mbps */
110 IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48), /* 36mbps */
111 IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54), /* 48mbps */
112 IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
113 IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
114};
115
116static int iwl4965_hwrate_to_plcp_idx(u32 rate_n_flags)
117{
118 int idx = 0;
119
120 /* HT rate format */
121 if (rate_n_flags & RATE_MCS_HT_MSK) {
122 idx = (rate_n_flags & 0xff);
123
124 if (idx >= IWL_RATE_MIMO2_6M_PLCP)
125 idx = idx - IWL_RATE_MIMO2_6M_PLCP;
126
127 idx += IWL_FIRST_OFDM_RATE;
128 /* skip 9M not supported in ht*/
129 if (idx >= IWL_RATE_9M_INDEX)
130 idx += 1;
131 if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE))
132 return idx;
133
134 /* legacy rate format, search for match in table */
135 } else {
136 for (idx = 0; idx < ARRAY_SIZE(iwlegacy_rates); idx++)
137 if (iwlegacy_rates[idx].plcp == (rate_n_flags & 0xFF))
138 return idx;
139 }
140
141 return -1;
142}
143
144static void iwl4965_rs_rate_scale_perform(struct iwl_priv *priv,
145 struct sk_buff *skb,
146 struct ieee80211_sta *sta,
147 struct iwl_lq_sta *lq_sta);
148static void iwl4965_rs_fill_link_cmd(struct iwl_priv *priv,
149 struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
150static void iwl4965_rs_stay_in_table(struct iwl_lq_sta *lq_sta,
151 bool force_search);
152
153#ifdef CONFIG_MAC80211_DEBUGFS
154static void iwl4965_rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
155 u32 *rate_n_flags, int index);
156#else
157static void iwl4965_rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
158 u32 *rate_n_flags, int index)
159{}
160#endif
161
162/**
163 * The following tables contain the expected throughput metrics for all rates
164 *
165 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
166 *
167 * where invalid entries are zeros.
168 *
169 * CCK rates are only valid in legacy table and will only be used in G
170 * (2.4 GHz) band.
171 */
172
173static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
174 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
175};
176
177static s32 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
178 {0, 0, 0, 0, 42, 0, 76, 102, 124, 158, 183, 193, 202}, /* Norm */
179 {0, 0, 0, 0, 46, 0, 82, 110, 132, 167, 192, 202, 210}, /* SGI */
180 {0, 0, 0, 0, 48, 0, 93, 135, 176, 251, 319, 351, 381}, /* AGG */
181 {0, 0, 0, 0, 53, 0, 102, 149, 193, 275, 348, 381, 413}, /* AGG+SGI */
182};
183
184static s32 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
185 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
186 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
187 {0, 0, 0, 0, 96, 0, 182, 259, 328, 451, 553, 598, 640}, /* AGG */
188 {0, 0, 0, 0, 106, 0, 199, 282, 357, 487, 593, 640, 683}, /* AGG+SGI */
189};
190
191static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
192 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250}, /* Norm */
193 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256}, /* SGI */
194 {0, 0, 0, 0, 92, 0, 175, 250, 317, 436, 534, 578, 619}, /* AGG */
195 {0, 0, 0, 0, 102, 0, 192, 273, 344, 470, 573, 619, 660}, /* AGG+SGI*/
196};
197
198static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
199 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
200 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
201 {0, 0, 0, 0, 180, 0, 327, 446, 545, 708, 828, 878, 922}, /* AGG */
202 {0, 0, 0, 0, 197, 0, 355, 481, 584, 752, 872, 922, 966}, /* AGG+SGI */
203};
204
205/* mbps, mcs */
206static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
207 { "1", "BPSK DSSS"},
208 { "2", "QPSK DSSS"},
209 {"5.5", "BPSK CCK"},
210 { "11", "QPSK CCK"},
211 { "6", "BPSK 1/2"},
212 { "9", "BPSK 1/2"},
213 { "12", "QPSK 1/2"},
214 { "18", "QPSK 3/4"},
215 { "24", "16QAM 1/2"},
216 { "36", "16QAM 3/4"},
217 { "48", "64QAM 2/3"},
218 { "54", "64QAM 3/4"},
219 { "60", "64QAM 5/6"},
220};
221
222#define MCS_INDEX_PER_STREAM (8)
223
224static inline u8 iwl4965_rs_extract_rate(u32 rate_n_flags)
225{
226 return (u8)(rate_n_flags & 0xFF);
227}
228
229static void
230iwl4965_rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
231{
232 window->data = 0;
233 window->success_counter = 0;
234 window->success_ratio = IWL_INVALID_VALUE;
235 window->counter = 0;
236 window->average_tpt = IWL_INVALID_VALUE;
237 window->stamp = 0;
238}
239
240static inline u8 iwl4965_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 statistics. All data that is older than
247 * TID_MAX_TIME_DIFF, will be deleted.
248 */
249static void
250iwl4965_rs_tl_rm_old_stats(struct iwl_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 &&
256 (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 iwl4965_rs_tl_add_packet(struct iwl_lq_sta *lq_data,
272 struct ieee80211_hdr *hdr)
273{
274 u32 curr_time = jiffies_to_msecs(jiffies);
275 u32 time_diff;
276 s32 index;
277 struct iwl_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 index = 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 (index >= TID_QUEUE_MAX_SIZE)
309 iwl4965_rs_tl_rm_old_stats(tl, curr_time);
310
311 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
312 tl->packet_count[index] = tl->packet_count[index] + 1;
313 tl->total = tl->total + 1;
314
315 if ((index + 1) > tl->queue_count)
316 tl->queue_count = index + 1;
317
318 return tid;
319}
320
321/*
322 get the traffic load value for tid
323*/
324static u32 iwl4965_rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
325{
326 u32 curr_time = jiffies_to_msecs(jiffies);
327 u32 time_diff;
328 s32 index;
329 struct iwl_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 index = 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 (index >= TID_QUEUE_MAX_SIZE)
347 iwl4965_rs_tl_rm_old_stats(tl, curr_time);
348
349 return tl->total;
350}
351
352static int iwl4965_rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
353 struct iwl_lq_sta *lq_data, u8 tid,
354 struct ieee80211_sta *sta)
355{
356 int ret = -EAGAIN;
357 u32 load;
358
359 load = iwl4965_rs_tl_get_load(lq_data, tid);
360
361 if (load > IWL_AGG_LOAD_THRESHOLD) {
362 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
363 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 IWL_ERR(priv, "Fail start Tx agg on tid: %d\n",
372 tid);
373 ieee80211_stop_tx_ba_session(sta, tid);
374 }
375 } else {
376 IWL_ERR(priv, "Aggregation not enabled for tid %d "
377 "because load = %u\n", tid, load);
378 }
379 return ret;
380}
381
382static void iwl4965_rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
383 struct iwl_lq_sta *lq_data,
384 struct ieee80211_sta *sta)
385{
386 if (tid < TID_MAX_LOAD_COUNT)
387 iwl4965_rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
388 else
389 IWL_ERR(priv, "tid exceeds max load count: %d/%d\n",
390 tid, TID_MAX_LOAD_COUNT);
391}
392
393static inline int iwl4965_get_iwl4965_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 iwl_scale_tbl_info
402 * that wraps a NULL pointer check
403 */
404static s32
405iwl4965_get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
406{
407 if (tbl->expected_tpt)
408 return tbl->expected_tpt[rs_index];
409 return 0;
410}
411
412/**
413 * iwl4965_rs_collect_tx_data - Update the success/failure sliding window
414 *
415 * We keep a sliding window of the last 62 packets transmitted
416 * at this rate. window->data contains the bitmask of successful
417 * packets.
418 */
419static int iwl4965_rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
420 int scale_index, int attempts, int successes)
421{
422 struct iwl_rate_scale_data *window = NULL;
423 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
424 s32 fail_count, tpt;
425
426 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
427 return -EINVAL;
428
429 /* Select window for current tx bit rate */
430 window = &(tbl->win[scale_index]);
431
432 /* Get expected throughput */
433 tpt = iwl4965_get_expected_tpt(tbl, scale_index);
434
435 /*
436 * Keep track of only the latest 62 tx frame attempts in this rate's
437 * history window; anything older isn't really relevant any more.
438 * If we have filled up the sliding window, 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 (window->counter >= IWL_RATE_MAX_WINDOW) {
445
446 /* remove earliest */
447 window->counter = IWL_RATE_MAX_WINDOW - 1;
448
449 if (window->data & mask) {
450 window->data &= ~mask;
451 window->success_counter--;
452 }
453 }
454
455 /* Increment frames-attempted counter */
456 window->counter++;
457
458 /* Shift bitmap by one frame to throw away oldest history */
459 window->data <<= 1;
460
461 /* Mark the most recent #successes attempts as successful */
462 if (successes > 0) {
463 window->success_counter++;
464 window->data |= 0x1;
465 successes--;
466 }
467
468 attempts--;
469 }
470
471 /* Calculate current success ratio, avoid divide-by-0! */
472 if (window->counter > 0)
473 window->success_ratio = 128 * (100 * window->success_counter)
474 / window->counter;
475 else
476 window->success_ratio = IWL_INVALID_VALUE;
477
478 fail_count = window->counter - window->success_counter;
479
480 /* Calculate average throughput, if we have enough history. */
481 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
482 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
483 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
484 else
485 window->average_tpt = IWL_INVALID_VALUE;
486
487 /* Tag this window as having been updated */
488 window->stamp = jiffies;
489
490 return 0;
491}
492
493/*
494 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
495 */
496static u32 iwl4965_rate_n_flags_from_tbl(struct iwl_priv *priv,
497 struct iwl_scale_tbl_info *tbl,
498 int index, u8 use_green)
499{
500 u32 rate_n_flags = 0;
501
502 if (is_legacy(tbl->lq_type)) {
503 rate_n_flags = iwlegacy_rates[index].plcp;
504 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
505 rate_n_flags |= RATE_MCS_CCK_MSK;
506
507 } else if (is_Ht(tbl->lq_type)) {
508 if (index > IWL_LAST_OFDM_RATE) {
509 IWL_ERR(priv, "Invalid HT rate index %d\n", index);
510 index = IWL_LAST_OFDM_RATE;
511 }
512 rate_n_flags = RATE_MCS_HT_MSK;
513
514 if (is_siso(tbl->lq_type))
515 rate_n_flags |= iwlegacy_rates[index].plcp_siso;
516 else
517 rate_n_flags |= iwlegacy_rates[index].plcp_mimo2;
518 } else {
519 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
520 }
521
522 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
523 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 IWL_ERR(priv, "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 */
550static int iwl4965_rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
551 enum ieee80211_band band,
552 struct iwl_scale_tbl_info *tbl,
553 int *rate_idx)
554{
555 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
556 u8 iwl4965_num_of_ant = iwl4965_get_iwl4965_num_of_ant_from_rate(rate_n_flags);
557 u8 mcs;
558
559 memset(tbl, 0, sizeof(struct iwl_scale_tbl_info));
560 *rate_idx = iwl4965_hwrate_to_plcp_idx(rate_n_flags);
561
562 if (*rate_idx == IWL_RATE_INVALID) {
563 *rate_idx = -1;
564 return -EINVAL;
565 }
566 tbl->is_SGI = 0; /* default legacy setup */
567 tbl->is_ht40 = 0;
568 tbl->is_dup = 0;
569 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
570 tbl->lq_type = LQ_NONE;
571 tbl->max_search = IWL_MAX_SEARCH;
572
573 /* legacy rate format */
574 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
575 if (iwl4965_num_of_ant == 1) {
576 if (band == IEEE80211_BAND_5GHZ)
577 tbl->lq_type = LQ_A;
578 else
579 tbl->lq_type = LQ_G;
580 }
581 /* HT rate format */
582 } else {
583 if (rate_n_flags & RATE_MCS_SGI_MSK)
584 tbl->is_SGI = 1;
585
586 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
587 (rate_n_flags & RATE_MCS_DUP_MSK))
588 tbl->is_ht40 = 1;
589
590 if (rate_n_flags & RATE_MCS_DUP_MSK)
591 tbl->is_dup = 1;
592
593 mcs = iwl4965_rs_extract_rate(rate_n_flags);
594
595 /* SISO */
596 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
597 if (iwl4965_num_of_ant == 1)
598 tbl->lq_type = LQ_SISO; /*else NONE*/
599 /* MIMO2 */
600 } else {
601 if (iwl4965_num_of_ant == 2)
602 tbl->lq_type = LQ_MIMO2;
603 }
604 }
605 return 0;
606}
607
608/* switch to another antenna/antennas and return 1 */
609/* if no other valid antenna found, return 0 */
610static int iwl4965_rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
611 struct iwl_scale_tbl_info *tbl)
612{
613 u8 new_ant_type;
614
615 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
616 return 0;
617
618 if (!iwl4965_rs_is_valid_ant(valid_ant, tbl->ant_type))
619 return 0;
620
621 new_ant_type = ant_toggle_lookup[tbl->ant_type];
622
623 while ((new_ant_type != tbl->ant_type) &&
624 !iwl4965_rs_is_valid_ant(valid_ant, new_ant_type))
625 new_ant_type = ant_toggle_lookup[new_ant_type];
626
627 if (new_ant_type == tbl->ant_type)
628 return 0;
629
630 tbl->ant_type = new_ant_type;
631 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
632 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
633 return 1;
634}
635
636/**
637 * Green-field mode is valid if the station supports it and
638 * there are no non-GF stations present in the BSS.
639 */
640static bool iwl4965_rs_use_green(struct ieee80211_sta *sta)
641{
642 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
643 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
644
645 return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
646 !(ctx->ht.non_gf_sta_present);
647}
648
649/**
650 * iwl4965_rs_get_supported_rates - get the available rates
651 *
652 * if management frame or broadcast frame only return
653 * basic available rates.
654 *
655 */
656static u16 iwl4965_rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
657 struct ieee80211_hdr *hdr,
658 enum iwl_table_type rate_type)
659{
660 if (is_legacy(rate_type)) {
661 return lq_sta->active_legacy_rate;
662 } else {
663 if (is_siso(rate_type))
664 return lq_sta->active_siso_rate;
665 else
666 return lq_sta->active_mimo2_rate;
667 }
668}
669
670static u16
671iwl4965_rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
672 int rate_type)
673{
674 u8 high = IWL_RATE_INVALID;
675 u8 low = IWL_RATE_INVALID;
676
677 /* 802.11A or ht walks to the next literal adjacent rate in
678 * the rate table */
679 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
680 int i;
681 u32 mask;
682
683 /* Find the previous rate that is in the rate mask */
684 i = index - 1;
685 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
686 if (rate_mask & mask) {
687 low = i;
688 break;
689 }
690 }
691
692 /* Find the next rate that is in the rate mask */
693 i = index + 1;
694 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
695 if (rate_mask & mask) {
696 high = i;
697 break;
698 }
699 }
700
701 return (high << 8) | low;
702 }
703
704 low = index;
705 while (low != IWL_RATE_INVALID) {
706 low = iwlegacy_rates[low].prev_rs;
707 if (low == IWL_RATE_INVALID)
708 break;
709 if (rate_mask & (1 << low))
710 break;
711 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
712 }
713
714 high = index;
715 while (high != IWL_RATE_INVALID) {
716 high = iwlegacy_rates[high].next_rs;
717 if (high == IWL_RATE_INVALID)
718 break;
719 if (rate_mask & (1 << high))
720 break;
721 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
722 }
723
724 return (high << 8) | low;
725}
726
727static u32 iwl4965_rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
728 struct iwl_scale_tbl_info *tbl,
729 u8 scale_index, u8 ht_possible)
730{
731 s32 low;
732 u16 rate_mask;
733 u16 high_low;
734 u8 switch_to_legacy = 0;
735 u8 is_green = lq_sta->is_green;
736 struct iwl_priv *priv = lq_sta->drv;
737
738 /* check if we need to switch from HT to legacy rates.
739 * assumption is that mandatory rates (1Mbps or 6Mbps)
740 * are always supported (spec demand) */
741 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
742 switch_to_legacy = 1;
743 scale_index = rs_ht_to_legacy[scale_index];
744 if (lq_sta->band == IEEE80211_BAND_5GHZ)
745 tbl->lq_type = LQ_A;
746 else
747 tbl->lq_type = LQ_G;
748
749 if (iwl4965_num_of_ant(tbl->ant_type) > 1)
750 tbl->ant_type =
751 iwl4965_first_antenna(priv->hw_params.valid_tx_ant);
752
753 tbl->is_ht40 = 0;
754 tbl->is_SGI = 0;
755 tbl->max_search = IWL_MAX_SEARCH;
756 }
757
758 rate_mask = iwl4965_rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
759
760 /* Mask with station rate restriction */
761 if (is_legacy(tbl->lq_type)) {
762 /* supp_rates has no CCK bits in A mode */
763 if (lq_sta->band == IEEE80211_BAND_5GHZ)
764 rate_mask = (u16)(rate_mask &
765 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
766 else
767 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
768 }
769
770 /* If we switched from HT to legacy, check current rate */
771 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
772 low = scale_index;
773 goto out;
774 }
775
776 high_low = iwl4965_rs_get_adjacent_rate(lq_sta->drv,
777 scale_index, rate_mask,
778 tbl->lq_type);
779 low = high_low & 0xff;
780
781 if (low == IWL_RATE_INVALID)
782 low = scale_index;
783
784out:
785 return iwl4965_rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
786}
787
788/*
789 * Simple function to compare two rate scale table types
790 */
791static bool iwl4965_table_type_matches(struct iwl_scale_tbl_info *a,
792 struct iwl_scale_tbl_info *b)
793{
794 return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
795 (a->is_SGI == b->is_SGI);
796}
797
798/*
799 * mac80211 sends us Tx status
800 */
801static void
802iwl4965_rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
803 struct ieee80211_sta *sta, void *priv_sta,
804 struct sk_buff *skb)
805{
806 int legacy_success;
807 int retries;
808 int rs_index, mac_index, i;
809 struct iwl_lq_sta *lq_sta = priv_sta;
810 struct iwl_link_quality_cmd *table;
811 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
812 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
813 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
814 enum mac80211_rate_control_flags mac_flags;
815 u32 tx_rate;
816 struct iwl_scale_tbl_info tbl_type;
817 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
818 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
819 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
820
821 IWL_DEBUG_RATE_LIMIT(priv,
822 "get frame ack response, update rate scale window\n");
823
824 /* Treat uninitialized rate scaling data same as non-existing. */
825 if (!lq_sta) {
826 IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n");
827 return;
828 } else if (!lq_sta->drv) {
829 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
830 return;
831 }
832
833 if (!ieee80211_is_data(hdr->frame_control) ||
834 info->flags & IEEE80211_TX_CTL_NO_ACK)
835 return;
836
837 /* This packet was aggregated but doesn't carry status info */
838 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
839 !(info->flags & IEEE80211_TX_STAT_AMPDU))
840 return;
841
842 /*
843 * Ignore this Tx frame response if its initial rate doesn't match
844 * that of latest Link Quality command. There may be stragglers
845 * from a previous Link Quality command, but we're no longer interested
846 * in those; they're either from the "active" mode while we're trying
847 * to check "search" mode, or a prior "search" mode after we've moved
848 * to a new "search" mode (which might become the new "active" mode).
849 */
850 table = &lq_sta->lq;
851 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
852 iwl4965_rs_get_tbl_info_from_mcs(tx_rate,
853 priv->band, &tbl_type, &rs_index);
854 if (priv->band == IEEE80211_BAND_5GHZ)
855 rs_index -= IWL_FIRST_OFDM_RATE;
856 mac_flags = info->status.rates[0].flags;
857 mac_index = info->status.rates[0].idx;
858 /* For HT packets, map MCS to PLCP */
859 if (mac_flags & IEEE80211_TX_RC_MCS) {
860 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
861 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
862 mac_index++;
863 /*
864 * mac80211 HT index is always zero-indexed; we need to move
865 * HT OFDM rates after CCK rates in 2.4 GHz band
866 */
867 if (priv->band == IEEE80211_BAND_2GHZ)
868 mac_index += IWL_FIRST_OFDM_RATE;
869 }
870 /* Here we actually compare this rate to the latest LQ command */
871 if ((mac_index < 0) ||
872 (tbl_type.is_SGI !=
873 !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
874 (tbl_type.is_ht40 !=
875 !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
876 (tbl_type.is_dup !=
877 !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
878 (tbl_type.ant_type != info->antenna_sel_tx) ||
879 (!!(tx_rate & RATE_MCS_HT_MSK) !=
880 !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
881 (!!(tx_rate & RATE_MCS_GF_MSK) !=
882 !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
883 (rs_index != mac_index)) {
884 IWL_DEBUG_RATE(priv,
885 "initial rate %d does not match %d (0x%x)\n",
886 mac_index, rs_index, tx_rate);
887 /*
888 * Since rates mis-match, the last LQ command may have failed.
889 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
890 * ... driver.
891 */
892 lq_sta->missed_rate_counter++;
893 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
894 lq_sta->missed_rate_counter = 0;
895 iwl_legacy_send_lq_cmd(priv, ctx, &lq_sta->lq,
896 CMD_ASYNC, false);
897 }
898 /* Regardless, ignore this status info for outdated rate */
899 return;
900 } else
901 /* Rate did match, so reset the missed_rate_counter */
902 lq_sta->missed_rate_counter = 0;
903
904 /* Figure out if rate scale algorithm is in active or search table */
905 if (iwl4965_table_type_matches(&tbl_type,
906 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
907 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
908 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
909 } else if (iwl4965_table_type_matches(&tbl_type,
910 &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
911 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
912 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
913 } else {
914 IWL_DEBUG_RATE(priv,
915 "Neither active nor search matches tx rate\n");
916 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
917 IWL_DEBUG_RATE(priv, "active- lq:%x, ant:%x, SGI:%d\n",
918 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
919 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
920 IWL_DEBUG_RATE(priv, "search- lq:%x, ant:%x, SGI:%d\n",
921 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
922 IWL_DEBUG_RATE(priv, "actual- lq:%x, ant:%x, SGI:%d\n",
923 tbl_type.lq_type, tbl_type.ant_type, tbl_type.is_SGI);
924 /*
925 * no matching table found, let's by-pass the data collection
926 * and continue to perform rate scale to find the rate table
927 */
928 iwl4965_rs_stay_in_table(lq_sta, true);
929 goto done;
930 }
931
932 /*
933 * Updating the frame history depends on whether packets were
934 * aggregated.
935 *
936 * For aggregation, all packets were transmitted at the same rate, the
937 * first index into rate scale table.
938 */
939 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
940 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
941 iwl4965_rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
942 &rs_index);
943 iwl4965_rs_collect_tx_data(curr_tbl, rs_index,
944 info->status.ampdu_len,
945 info->status.ampdu_ack_len);
946
947 /* Update success/fail counts if not searching for new mode */
948 if (lq_sta->stay_in_tbl) {
949 lq_sta->total_success += info->status.ampdu_ack_len;
950 lq_sta->total_failed += (info->status.ampdu_len -
951 info->status.ampdu_ack_len);
952 }
953 } else {
954 /*
955 * For legacy, update frame history with for each Tx retry.
956 */
957 retries = info->status.rates[0].count - 1;
958 /* HW doesn't send more than 15 retries */
959 retries = min(retries, 15);
960
961 /* The last transmission may have been successful */
962 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
963 /* Collect data for each rate used during failed TX attempts */
964 for (i = 0; i <= retries; ++i) {
965 tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
966 iwl4965_rs_get_tbl_info_from_mcs(tx_rate, priv->band,
967 &tbl_type, &rs_index);
968 /*
969 * Only collect stats if retried rate is in the same RS
970 * table as active/search.
971 */
972 if (iwl4965_table_type_matches(&tbl_type, curr_tbl))
973 tmp_tbl = curr_tbl;
974 else if (iwl4965_table_type_matches(&tbl_type,
975 other_tbl))
976 tmp_tbl = other_tbl;
977 else
978 continue;
979 iwl4965_rs_collect_tx_data(tmp_tbl, rs_index, 1,
980 i < retries ? 0 : legacy_success);
981 }
982
983 /* Update success/fail counts if not searching for new mode */
984 if (lq_sta->stay_in_tbl) {
985 lq_sta->total_success += legacy_success;
986 lq_sta->total_failed += retries + (1 - legacy_success);
987 }
988 }
989 /* The last TX rate is cached in lq_sta; it's set in if/else above */
990 lq_sta->last_rate_n_flags = tx_rate;
991done:
992 /* See if there's a better rate or modulation mode to try. */
993 if (sta && sta->supp_rates[sband->band])
994 iwl4965_rs_rate_scale_perform(priv, skb, sta, lq_sta);
995}
996
997/*
998 * Begin a period of staying with a selected modulation mode.
999 * Set "stay_in_tbl" flag to prevent any mode switches.
1000 * Set frame tx success limits according to legacy vs. high-throughput,
1001 * and reset overall (spanning all rates) tx success history statistics.
1002 * These control how long we stay using same modulation mode before
1003 * searching for a new mode.
1004 */
1005static void iwl4965_rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
1006 struct iwl_lq_sta *lq_sta)
1007{
1008 IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
1009 lq_sta->stay_in_tbl = 1; /* only place this gets set */
1010 if (is_legacy) {
1011 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1012 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1013 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1014 } else {
1015 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1016 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1017 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1018 }
1019 lq_sta->table_count = 0;
1020 lq_sta->total_failed = 0;
1021 lq_sta->total_success = 0;
1022 lq_sta->flush_timer = jiffies;
1023 lq_sta->action_counter = 0;
1024}
1025
1026/*
1027 * Find correct throughput table for given mode of modulation
1028 */
1029static void iwl4965_rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1030 struct iwl_scale_tbl_info *tbl)
1031{
1032 /* Used to choose among HT tables */
1033 s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1034
1035 /* Check for invalid LQ type */
1036 if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1037 tbl->expected_tpt = expected_tpt_legacy;
1038 return;
1039 }
1040
1041 /* Legacy rates have only one table */
1042 if (is_legacy(tbl->lq_type)) {
1043 tbl->expected_tpt = expected_tpt_legacy;
1044 return;
1045 }
1046
1047 /* Choose among many HT tables depending on number of streams
1048 * (SISO/MIMO2), channel width (20/40), SGI, and aggregation
1049 * status */
1050 if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1051 ht_tbl_pointer = expected_tpt_siso20MHz;
1052 else if (is_siso(tbl->lq_type))
1053 ht_tbl_pointer = expected_tpt_siso40MHz;
1054 else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1055 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1056 else /* if (is_mimo2(tbl->lq_type)) <-- must be true */
1057 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1058
1059 if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */
1060 tbl->expected_tpt = ht_tbl_pointer[0];
1061 else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */
1062 tbl->expected_tpt = ht_tbl_pointer[1];
1063 else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */
1064 tbl->expected_tpt = ht_tbl_pointer[2];
1065 else /* AGG+SGI */
1066 tbl->expected_tpt = ht_tbl_pointer[3];
1067}
1068
1069/*
1070 * Find starting rate for new "search" high-throughput mode of modulation.
1071 * Goal is to find lowest expected rate (under perfect conditions) that is
1072 * above the current measured throughput of "active" mode, to give new mode
1073 * a fair chance to prove itself without too many challenges.
1074 *
1075 * This gets called when transitioning to more aggressive modulation
1076 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1077 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1078 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1079 * bit rate will typically need to increase, but not if performance was bad.
1080 */
1081static s32 iwl4965_rs_get_best_rate(struct iwl_priv *priv,
1082 struct iwl_lq_sta *lq_sta,
1083 struct iwl_scale_tbl_info *tbl, /* "search" */
1084 u16 rate_mask, s8 index)
1085{
1086 /* "active" values */
1087 struct iwl_scale_tbl_info *active_tbl =
1088 &(lq_sta->lq_info[lq_sta->active_tbl]);
1089 s32 active_sr = active_tbl->win[index].success_ratio;
1090 s32 active_tpt = active_tbl->expected_tpt[index];
1091
1092 /* expected "search" throughput */
1093 s32 *tpt_tbl = tbl->expected_tpt;
1094
1095 s32 new_rate, high, low, start_hi;
1096 u16 high_low;
1097 s8 rate = index;
1098
1099 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1100
1101 for (; ;) {
1102 high_low = iwl4965_rs_get_adjacent_rate(priv, rate, rate_mask,
1103 tbl->lq_type);
1104
1105 low = high_low & 0xff;
1106 high = (high_low >> 8) & 0xff;
1107
1108 /*
1109 * Lower the "search" bit rate, to give new "search" mode
1110 * approximately the same throughput as "active" if:
1111 *
1112 * 1) "Active" mode has been working modestly well (but not
1113 * great), and expected "search" throughput (under perfect
1114 * conditions) at candidate rate is above the actual
1115 * measured "active" throughput (but less than expected
1116 * "active" throughput under perfect conditions).
1117 * OR
1118 * 2) "Active" mode has been working perfectly or very well
1119 * and expected "search" throughput (under perfect
1120 * conditions) at candidate rate is above expected
1121 * "active" throughput (under perfect conditions).
1122 */
1123 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1124 ((active_sr > IWL_RATE_DECREASE_TH) &&
1125 (active_sr <= IWL_RATE_HIGH_TH) &&
1126 (tpt_tbl[rate] <= active_tpt))) ||
1127 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1128 (tpt_tbl[rate] > active_tpt))) {
1129
1130 /* (2nd or later pass)
1131 * If we've already tried to raise the rate, and are
1132 * now trying to lower it, use the higher rate. */
1133 if (start_hi != IWL_RATE_INVALID) {
1134 new_rate = start_hi;
1135 break;
1136 }
1137
1138 new_rate = rate;
1139
1140 /* Loop again with lower rate */
1141 if (low != IWL_RATE_INVALID)
1142 rate = low;
1143
1144 /* Lower rate not available, use the original */
1145 else
1146 break;
1147
1148 /* Else try to raise the "search" rate to match "active" */
1149 } else {
1150 /* (2nd or later pass)
1151 * If we've already tried to lower the rate, and are
1152 * now trying to raise it, use the lower rate. */
1153 if (new_rate != IWL_RATE_INVALID)
1154 break;
1155
1156 /* Loop again with higher rate */
1157 else if (high != IWL_RATE_INVALID) {
1158 start_hi = high;
1159 rate = high;
1160
1161 /* Higher rate not available, use the original */
1162 } else {
1163 new_rate = rate;
1164 break;
1165 }
1166 }
1167 }
1168
1169 return new_rate;
1170}
1171
1172/*
1173 * Set up search table for MIMO2
1174 */
1175static int iwl4965_rs_switch_to_mimo2(struct iwl_priv *priv,
1176 struct iwl_lq_sta *lq_sta,
1177 struct ieee80211_conf *conf,
1178 struct ieee80211_sta *sta,
1179 struct iwl_scale_tbl_info *tbl, int index)
1180{
1181 u16 rate_mask;
1182 s32 rate;
1183 s8 is_green = lq_sta->is_green;
1184 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1185 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1186
1187 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1188 return -1;
1189
1190 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1191 == WLAN_HT_CAP_SM_PS_STATIC)
1192 return -1;
1193
1194 /* Need both Tx chains/antennas to support MIMO */
1195 if (priv->hw_params.tx_chains_num < 2)
1196 return -1;
1197
1198 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1199
1200 tbl->lq_type = LQ_MIMO2;
1201 tbl->is_dup = lq_sta->is_dup;
1202 tbl->action = 0;
1203 tbl->max_search = IWL_MAX_SEARCH;
1204 rate_mask = lq_sta->active_mimo2_rate;
1205
1206 if (iwl_legacy_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1207 tbl->is_ht40 = 1;
1208 else
1209 tbl->is_ht40 = 0;
1210
1211 iwl4965_rs_set_expected_tpt_table(lq_sta, tbl);
1212
1213 rate = iwl4965_rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1214
1215 IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n",
1216 rate, rate_mask);
1217 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1218 IWL_DEBUG_RATE(priv,
1219 "Can't switch with index %d rate mask %x\n",
1220 rate, rate_mask);
1221 return -1;
1222 }
1223 tbl->current_rate = iwl4965_rate_n_flags_from_tbl(priv,
1224 tbl, rate, is_green);
1225
1226 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1227 tbl->current_rate, is_green);
1228 return 0;
1229}
1230
1231/*
1232 * Set up search table for SISO
1233 */
1234static int iwl4965_rs_switch_to_siso(struct iwl_priv *priv,
1235 struct iwl_lq_sta *lq_sta,
1236 struct ieee80211_conf *conf,
1237 struct ieee80211_sta *sta,
1238 struct iwl_scale_tbl_info *tbl, int index)
1239{
1240 u16 rate_mask;
1241 u8 is_green = lq_sta->is_green;
1242 s32 rate;
1243 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1244 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1245
1246 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1247 return -1;
1248
1249 IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1250
1251 tbl->is_dup = lq_sta->is_dup;
1252 tbl->lq_type = LQ_SISO;
1253 tbl->action = 0;
1254 tbl->max_search = IWL_MAX_SEARCH;
1255 rate_mask = lq_sta->active_siso_rate;
1256
1257 if (iwl_legacy_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1258 tbl->is_ht40 = 1;
1259 else
1260 tbl->is_ht40 = 0;
1261
1262 if (is_green)
1263 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1264
1265 iwl4965_rs_set_expected_tpt_table(lq_sta, tbl);
1266 rate = iwl4965_rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1267
1268 IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1269 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1270 IWL_DEBUG_RATE(priv,
1271 "can not switch with index %d rate mask %x\n",
1272 rate, rate_mask);
1273 return -1;
1274 }
1275 tbl->current_rate = iwl4965_rate_n_flags_from_tbl(priv,
1276 tbl, rate, is_green);
1277 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1278 tbl->current_rate, is_green);
1279 return 0;
1280}
1281
1282/*
1283 * Try to switch to new modulation mode from legacy
1284 */
1285static int iwl4965_rs_move_legacy_other(struct iwl_priv *priv,
1286 struct iwl_lq_sta *lq_sta,
1287 struct ieee80211_conf *conf,
1288 struct ieee80211_sta *sta,
1289 int index)
1290{
1291 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1292 struct iwl_scale_tbl_info *search_tbl =
1293 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1294 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1295 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1296 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1297 u8 start_action;
1298 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1299 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1300 int ret = 0;
1301 u8 update_search_tbl_counter = 0;
1302
1303 tbl->action = IWL_LEGACY_SWITCH_SISO;
1304
1305 start_action = tbl->action;
1306 for (; ;) {
1307 lq_sta->action_counter++;
1308 switch (tbl->action) {
1309 case IWL_LEGACY_SWITCH_ANTENNA1:
1310 case IWL_LEGACY_SWITCH_ANTENNA2:
1311 IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1312
1313 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1314 tx_chains_num <= 1) ||
1315 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1316 tx_chains_num <= 2))
1317 break;
1318
1319 /* Don't change antenna if success has been great */
1320 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1321 break;
1322
1323 /* Set up search table to try other antenna */
1324 memcpy(search_tbl, tbl, sz);
1325
1326 if (iwl4965_rs_toggle_antenna(valid_tx_ant,
1327 &search_tbl->current_rate, search_tbl)) {
1328 update_search_tbl_counter = 1;
1329 iwl4965_rs_set_expected_tpt_table(lq_sta,
1330 search_tbl);
1331 goto out;
1332 }
1333 break;
1334 case IWL_LEGACY_SWITCH_SISO:
1335 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1336
1337 /* Set up search table to try SISO */
1338 memcpy(search_tbl, tbl, sz);
1339 search_tbl->is_SGI = 0;
1340 ret = iwl4965_rs_switch_to_siso(priv, lq_sta, conf, sta,
1341 search_tbl, index);
1342 if (!ret) {
1343 lq_sta->action_counter = 0;
1344 goto out;
1345 }
1346
1347 break;
1348 case IWL_LEGACY_SWITCH_MIMO2_AB:
1349 case IWL_LEGACY_SWITCH_MIMO2_AC:
1350 case IWL_LEGACY_SWITCH_MIMO2_BC:
1351 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1352
1353 /* Set up search table to try MIMO */
1354 memcpy(search_tbl, tbl, sz);
1355 search_tbl->is_SGI = 0;
1356
1357 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1358 search_tbl->ant_type = ANT_AB;
1359 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1360 search_tbl->ant_type = ANT_AC;
1361 else
1362 search_tbl->ant_type = ANT_BC;
1363
1364 if (!iwl4965_rs_is_valid_ant(valid_tx_ant,
1365 search_tbl->ant_type))
1366 break;
1367
1368 ret = iwl4965_rs_switch_to_mimo2(priv, lq_sta,
1369 conf, sta,
1370 search_tbl, index);
1371 if (!ret) {
1372 lq_sta->action_counter = 0;
1373 goto out;
1374 }
1375 break;
1376 }
1377 tbl->action++;
1378 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2_BC)
1379 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1380
1381 if (tbl->action == start_action)
1382 break;
1383
1384 }
1385 search_tbl->lq_type = LQ_NONE;
1386 return 0;
1387
1388out:
1389 lq_sta->search_better_tbl = 1;
1390 tbl->action++;
1391 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2_BC)
1392 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1393 if (update_search_tbl_counter)
1394 search_tbl->action = tbl->action;
1395 return 0;
1396
1397}
1398
1399/*
1400 * Try to switch to new modulation mode from SISO
1401 */
1402static int iwl4965_rs_move_siso_to_other(struct iwl_priv *priv,
1403 struct iwl_lq_sta *lq_sta,
1404 struct ieee80211_conf *conf,
1405 struct ieee80211_sta *sta, int index)
1406{
1407 u8 is_green = lq_sta->is_green;
1408 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1409 struct iwl_scale_tbl_info *search_tbl =
1410 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1411 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1412 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1413 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1414 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1415 u8 start_action;
1416 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1417 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1418 u8 update_search_tbl_counter = 0;
1419 int ret;
1420
1421 start_action = tbl->action;
1422
1423 for (;;) {
1424 lq_sta->action_counter++;
1425 switch (tbl->action) {
1426 case IWL_SISO_SWITCH_ANTENNA1:
1427 case IWL_SISO_SWITCH_ANTENNA2:
1428 IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1429 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1430 tx_chains_num <= 1) ||
1431 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1432 tx_chains_num <= 2))
1433 break;
1434
1435 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1436 break;
1437
1438 memcpy(search_tbl, tbl, sz);
1439 if (iwl4965_rs_toggle_antenna(valid_tx_ant,
1440 &search_tbl->current_rate, search_tbl)) {
1441 update_search_tbl_counter = 1;
1442 goto out;
1443 }
1444 break;
1445 case IWL_SISO_SWITCH_MIMO2_AB:
1446 case IWL_SISO_SWITCH_MIMO2_AC:
1447 case IWL_SISO_SWITCH_MIMO2_BC:
1448 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1449 memcpy(search_tbl, tbl, sz);
1450 search_tbl->is_SGI = 0;
1451
1452 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1453 search_tbl->ant_type = ANT_AB;
1454 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1455 search_tbl->ant_type = ANT_AC;
1456 else
1457 search_tbl->ant_type = ANT_BC;
1458
1459 if (!iwl4965_rs_is_valid_ant(valid_tx_ant,
1460 search_tbl->ant_type))
1461 break;
1462
1463 ret = iwl4965_rs_switch_to_mimo2(priv, lq_sta,
1464 conf, sta,
1465 search_tbl, index);
1466 if (!ret)
1467 goto out;
1468 break;
1469 case IWL_SISO_SWITCH_GI:
1470 if (!tbl->is_ht40 && !(ht_cap->cap &
1471 IEEE80211_HT_CAP_SGI_20))
1472 break;
1473 if (tbl->is_ht40 && !(ht_cap->cap &
1474 IEEE80211_HT_CAP_SGI_40))
1475 break;
1476
1477 IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1478
1479 memcpy(search_tbl, tbl, sz);
1480 if (is_green) {
1481 if (!tbl->is_SGI)
1482 break;
1483 else
1484 IWL_ERR(priv,
1485 "SGI was set in GF+SISO\n");
1486 }
1487 search_tbl->is_SGI = !tbl->is_SGI;
1488 iwl4965_rs_set_expected_tpt_table(lq_sta, search_tbl);
1489 if (tbl->is_SGI) {
1490 s32 tpt = lq_sta->last_tpt / 100;
1491 if (tpt >= search_tbl->expected_tpt[index])
1492 break;
1493 }
1494 search_tbl->current_rate =
1495 iwl4965_rate_n_flags_from_tbl(priv, search_tbl,
1496 index, is_green);
1497 update_search_tbl_counter = 1;
1498 goto out;
1499 }
1500 tbl->action++;
1501 if (tbl->action > IWL_SISO_SWITCH_GI)
1502 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1503
1504 if (tbl->action == start_action)
1505 break;
1506 }
1507 search_tbl->lq_type = LQ_NONE;
1508 return 0;
1509
1510 out:
1511 lq_sta->search_better_tbl = 1;
1512 tbl->action++;
1513 if (tbl->action > IWL_SISO_SWITCH_GI)
1514 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1515 if (update_search_tbl_counter)
1516 search_tbl->action = tbl->action;
1517
1518 return 0;
1519}
1520
1521/*
1522 * Try to switch to new modulation mode from MIMO2
1523 */
1524static int iwl4965_rs_move_mimo2_to_other(struct iwl_priv *priv,
1525 struct iwl_lq_sta *lq_sta,
1526 struct ieee80211_conf *conf,
1527 struct ieee80211_sta *sta, int index)
1528{
1529 s8 is_green = lq_sta->is_green;
1530 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1531 struct iwl_scale_tbl_info *search_tbl =
1532 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1533 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1534 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1535 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1536 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1537 u8 start_action;
1538 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1539 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1540 u8 update_search_tbl_counter = 0;
1541 int ret;
1542
1543 start_action = tbl->action;
1544 for (;;) {
1545 lq_sta->action_counter++;
1546 switch (tbl->action) {
1547 case IWL_MIMO2_SWITCH_ANTENNA1:
1548 case IWL_MIMO2_SWITCH_ANTENNA2:
1549 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1550
1551 if (tx_chains_num <= 2)
1552 break;
1553
1554 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1555 break;
1556
1557 memcpy(search_tbl, tbl, sz);
1558 if (iwl4965_rs_toggle_antenna(valid_tx_ant,
1559 &search_tbl->current_rate, search_tbl)) {
1560 update_search_tbl_counter = 1;
1561 goto out;
1562 }
1563 break;
1564 case IWL_MIMO2_SWITCH_SISO_A:
1565 case IWL_MIMO2_SWITCH_SISO_B:
1566 case IWL_MIMO2_SWITCH_SISO_C:
1567 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1568
1569 /* Set up new search table for SISO */
1570 memcpy(search_tbl, tbl, sz);
1571
1572 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1573 search_tbl->ant_type = ANT_A;
1574 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1575 search_tbl->ant_type = ANT_B;
1576 else
1577 search_tbl->ant_type = ANT_C;
1578
1579 if (!iwl4965_rs_is_valid_ant(valid_tx_ant,
1580 search_tbl->ant_type))
1581 break;
1582
1583 ret = iwl4965_rs_switch_to_siso(priv, lq_sta,
1584 conf, sta,
1585 search_tbl, index);
1586 if (!ret)
1587 goto out;
1588
1589 break;
1590
1591 case IWL_MIMO2_SWITCH_GI:
1592 if (!tbl->is_ht40 && !(ht_cap->cap &
1593 IEEE80211_HT_CAP_SGI_20))
1594 break;
1595 if (tbl->is_ht40 && !(ht_cap->cap &
1596 IEEE80211_HT_CAP_SGI_40))
1597 break;
1598
1599 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1600
1601 /* Set up new search table for MIMO2 */
1602 memcpy(search_tbl, tbl, sz);
1603 search_tbl->is_SGI = !tbl->is_SGI;
1604 iwl4965_rs_set_expected_tpt_table(lq_sta, search_tbl);
1605 /*
1606 * If active table already uses the fastest possible
1607 * modulation (dual stream with short guard interval),
1608 * and it's working well, there's no need to look
1609 * for a better type of modulation!
1610 */
1611 if (tbl->is_SGI) {
1612 s32 tpt = lq_sta->last_tpt / 100;
1613 if (tpt >= search_tbl->expected_tpt[index])
1614 break;
1615 }
1616 search_tbl->current_rate =
1617 iwl4965_rate_n_flags_from_tbl(priv, search_tbl,
1618 index, is_green);
1619 update_search_tbl_counter = 1;
1620 goto out;
1621
1622 }
1623 tbl->action++;
1624 if (tbl->action > IWL_MIMO2_SWITCH_GI)
1625 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1626
1627 if (tbl->action == start_action)
1628 break;
1629 }
1630 search_tbl->lq_type = LQ_NONE;
1631 return 0;
1632 out:
1633 lq_sta->search_better_tbl = 1;
1634 tbl->action++;
1635 if (tbl->action > IWL_MIMO2_SWITCH_GI)
1636 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1637 if (update_search_tbl_counter)
1638 search_tbl->action = tbl->action;
1639
1640 return 0;
1641
1642}
1643
1644/*
1645 * Check whether we should continue using same modulation mode, or
1646 * begin search for a new mode, based on:
1647 * 1) # tx successes or failures while using this mode
1648 * 2) # times calling this function
1649 * 3) elapsed time in this mode (not used, for now)
1650 */
1651static void
1652iwl4965_rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1653{
1654 struct iwl_scale_tbl_info *tbl;
1655 int i;
1656 int active_tbl;
1657 int flush_interval_passed = 0;
1658 struct iwl_priv *priv;
1659
1660 priv = lq_sta->drv;
1661 active_tbl = lq_sta->active_tbl;
1662
1663 tbl = &(lq_sta->lq_info[active_tbl]);
1664
1665 /* If we've been disallowing search, see if we should now allow it */
1666 if (lq_sta->stay_in_tbl) {
1667
1668 /* Elapsed time using current modulation mode */
1669 if (lq_sta->flush_timer)
1670 flush_interval_passed =
1671 time_after(jiffies,
1672 (unsigned long)(lq_sta->flush_timer +
1673 IWL_RATE_SCALE_FLUSH_INTVL));
1674
1675 /*
1676 * Check if we should allow search for new modulation mode.
1677 * If many frames have failed or succeeded, or we've used
1678 * this same modulation for a long time, allow search, and
1679 * reset history stats that keep track of whether we should
1680 * allow a new search. Also (below) reset all bitmaps and
1681 * stats in active history.
1682 */
1683 if (force_search ||
1684 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1685 (lq_sta->total_success > lq_sta->max_success_limit) ||
1686 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1687 && (flush_interval_passed))) {
1688 IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n:",
1689 lq_sta->total_failed,
1690 lq_sta->total_success,
1691 flush_interval_passed);
1692
1693 /* Allow search for new mode */
1694 lq_sta->stay_in_tbl = 0; /* only place reset */
1695 lq_sta->total_failed = 0;
1696 lq_sta->total_success = 0;
1697 lq_sta->flush_timer = 0;
1698
1699 /*
1700 * Else if we've used this modulation mode enough repetitions
1701 * (regardless of elapsed time or success/failure), reset
1702 * history bitmaps and rate-specific stats for all rates in
1703 * active table.
1704 */
1705 } else {
1706 lq_sta->table_count++;
1707 if (lq_sta->table_count >=
1708 lq_sta->table_count_limit) {
1709 lq_sta->table_count = 0;
1710
1711 IWL_DEBUG_RATE(priv,
1712 "LQ: stay in table clear win\n");
1713 for (i = 0; i < IWL_RATE_COUNT; i++)
1714 iwl4965_rs_rate_scale_clear_window(
1715 &(tbl->win[i]));
1716 }
1717 }
1718
1719 /* If transitioning to allow "search", reset all history
1720 * bitmaps and stats in active table (this will become the new
1721 * "search" table). */
1722 if (!lq_sta->stay_in_tbl) {
1723 for (i = 0; i < IWL_RATE_COUNT; i++)
1724 iwl4965_rs_rate_scale_clear_window(
1725 &(tbl->win[i]));
1726 }
1727 }
1728}
1729
1730/*
1731 * setup rate table in uCode
1732 * return rate_n_flags as used in the table
1733 */
1734static u32 iwl4965_rs_update_rate_tbl(struct iwl_priv *priv,
1735 struct iwl_rxon_context *ctx,
1736 struct iwl_lq_sta *lq_sta,
1737 struct iwl_scale_tbl_info *tbl,
1738 int index, u8 is_green)
1739{
1740 u32 rate;
1741
1742 /* Update uCode's rate table. */
1743 rate = iwl4965_rate_n_flags_from_tbl(priv, tbl, index, is_green);
1744 iwl4965_rs_fill_link_cmd(priv, lq_sta, rate);
1745 iwl_legacy_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
1746
1747 return rate;
1748}
1749
1750/*
1751 * Do rate scaling and search for new modulation mode.
1752 */
1753static void iwl4965_rs_rate_scale_perform(struct iwl_priv *priv,
1754 struct sk_buff *skb,
1755 struct ieee80211_sta *sta,
1756 struct iwl_lq_sta *lq_sta)
1757{
1758 struct ieee80211_hw *hw = priv->hw;
1759 struct ieee80211_conf *conf = &hw->conf;
1760 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1761 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1762 int low = IWL_RATE_INVALID;
1763 int high = IWL_RATE_INVALID;
1764 int index;
1765 int i;
1766 struct iwl_rate_scale_data *window = NULL;
1767 int current_tpt = IWL_INVALID_VALUE;
1768 int low_tpt = IWL_INVALID_VALUE;
1769 int high_tpt = IWL_INVALID_VALUE;
1770 u32 fail_count;
1771 s8 scale_action = 0;
1772 u16 rate_mask;
1773 u8 update_lq = 0;
1774 struct iwl_scale_tbl_info *tbl, *tbl1;
1775 u16 rate_scale_index_msk = 0;
1776 u32 rate;
1777 u8 is_green = 0;
1778 u8 active_tbl = 0;
1779 u8 done_search = 0;
1780 u16 high_low;
1781 s32 sr;
1782 u8 tid = MAX_TID_COUNT;
1783 struct iwl_tid_data *tid_data;
1784 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1785 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1786
1787 IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
1788
1789 /* Send management frames and NO_ACK data using lowest rate. */
1790 /* TODO: this could probably be improved.. */
1791 if (!ieee80211_is_data(hdr->frame_control) ||
1792 info->flags & IEEE80211_TX_CTL_NO_ACK)
1793 return;
1794
1795 if (!sta || !lq_sta)
1796 return;
1797
1798 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
1799
1800 tid = iwl4965_rs_tl_add_packet(lq_sta, hdr);
1801 if ((tid != MAX_TID_COUNT) && (lq_sta->tx_agg_tid_en & (1 << tid))) {
1802 tid_data = &priv->stations[lq_sta->lq.sta_id].tid[tid];
1803 if (tid_data->agg.state == IWL_AGG_OFF)
1804 lq_sta->is_agg = 0;
1805 else
1806 lq_sta->is_agg = 1;
1807 } else
1808 lq_sta->is_agg = 0;
1809
1810 /*
1811 * Select rate-scale / modulation-mode table to work with in
1812 * the rest of this function: "search" if searching for better
1813 * modulation mode, or "active" if doing rate scaling within a mode.
1814 */
1815 if (!lq_sta->search_better_tbl)
1816 active_tbl = lq_sta->active_tbl;
1817 else
1818 active_tbl = 1 - lq_sta->active_tbl;
1819
1820 tbl = &(lq_sta->lq_info[active_tbl]);
1821 if (is_legacy(tbl->lq_type))
1822 lq_sta->is_green = 0;
1823 else
1824 lq_sta->is_green = iwl4965_rs_use_green(sta);
1825 is_green = lq_sta->is_green;
1826
1827 /* current tx rate */
1828 index = lq_sta->last_txrate_idx;
1829
1830 IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
1831 tbl->lq_type);
1832
1833 /* rates available for this association, and for modulation mode */
1834 rate_mask = iwl4965_rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
1835
1836 IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
1837
1838 /* mask with station rate restriction */
1839 if (is_legacy(tbl->lq_type)) {
1840 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1841 /* supp_rates has no CCK bits in A mode */
1842 rate_scale_index_msk = (u16) (rate_mask &
1843 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1844 else
1845 rate_scale_index_msk = (u16) (rate_mask &
1846 lq_sta->supp_rates);
1847
1848 } else
1849 rate_scale_index_msk = rate_mask;
1850
1851 if (!rate_scale_index_msk)
1852 rate_scale_index_msk = rate_mask;
1853
1854 if (!((1 << index) & rate_scale_index_msk)) {
1855 IWL_ERR(priv, "Current Rate is not valid\n");
1856 if (lq_sta->search_better_tbl) {
1857 /* revert to active table if search table is not valid*/
1858 tbl->lq_type = LQ_NONE;
1859 lq_sta->search_better_tbl = 0;
1860 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1861 /* get "active" rate info */
1862 index = iwl4965_hwrate_to_plcp_idx(tbl->current_rate);
1863 rate = iwl4965_rs_update_rate_tbl(priv, ctx, lq_sta,
1864 tbl, index, is_green);
1865 }
1866 return;
1867 }
1868
1869 /* Get expected throughput table and history window for current rate */
1870 if (!tbl->expected_tpt) {
1871 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
1872 return;
1873 }
1874
1875 /* force user max rate if set by user */
1876 if ((lq_sta->max_rate_idx != -1) &&
1877 (lq_sta->max_rate_idx < index)) {
1878 index = lq_sta->max_rate_idx;
1879 update_lq = 1;
1880 window = &(tbl->win[index]);
1881 goto lq_update;
1882 }
1883
1884 window = &(tbl->win[index]);
1885
1886 /*
1887 * If there is not enough history to calculate actual average
1888 * throughput, keep analyzing results of more tx frames, without
1889 * changing rate or mode (bypass most of the rest of this function).
1890 * Set up new rate table in uCode only if old rate is not supported
1891 * in current association (use new rate found above).
1892 */
1893 fail_count = window->counter - window->success_counter;
1894 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1895 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
1896 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
1897 "for index %d\n",
1898 window->success_counter, window->counter, index);
1899
1900 /* Can't calculate this yet; not enough history */
1901 window->average_tpt = IWL_INVALID_VALUE;
1902
1903 /* Should we stay with this modulation mode,
1904 * or search for a new one? */
1905 iwl4965_rs_stay_in_table(lq_sta, false);
1906
1907 goto out;
1908 }
1909 /* Else we have enough samples; calculate estimate of
1910 * actual average throughput */
1911 if (window->average_tpt != ((window->success_ratio *
1912 tbl->expected_tpt[index] + 64) / 128)) {
1913 IWL_ERR(priv,
1914 "expected_tpt should have been calculated by now\n");
1915 window->average_tpt = ((window->success_ratio *
1916 tbl->expected_tpt[index] + 64) / 128);
1917 }
1918
1919 /* If we are searching for better modulation mode, check success. */
1920 if (lq_sta->search_better_tbl) {
1921 /* If good success, continue using the "search" mode;
1922 * no need to send new link quality command, since we're
1923 * continuing to use the setup that we've been trying. */
1924 if (window->average_tpt > lq_sta->last_tpt) {
1925
1926 IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
1927 "suc=%d cur-tpt=%d old-tpt=%d\n",
1928 window->success_ratio,
1929 window->average_tpt,
1930 lq_sta->last_tpt);
1931
1932 if (!is_legacy(tbl->lq_type))
1933 lq_sta->enable_counter = 1;
1934
1935 /* Swap tables; "search" becomes "active" */
1936 lq_sta->active_tbl = active_tbl;
1937 current_tpt = window->average_tpt;
1938
1939 /* Else poor success; go back to mode in "active" table */
1940 } else {
1941
1942 IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
1943 "suc=%d cur-tpt=%d old-tpt=%d\n",
1944 window->success_ratio,
1945 window->average_tpt,
1946 lq_sta->last_tpt);
1947
1948 /* Nullify "search" table */
1949 tbl->lq_type = LQ_NONE;
1950
1951 /* Revert to "active" table */
1952 active_tbl = lq_sta->active_tbl;
1953 tbl = &(lq_sta->lq_info[active_tbl]);
1954
1955 /* Revert to "active" rate and throughput info */
1956 index = iwl4965_hwrate_to_plcp_idx(tbl->current_rate);
1957 current_tpt = lq_sta->last_tpt;
1958
1959 /* Need to set up a new rate table in uCode */
1960 update_lq = 1;
1961 }
1962
1963 /* Either way, we've made a decision; modulation mode
1964 * search is done, allow rate adjustment next time. */
1965 lq_sta->search_better_tbl = 0;
1966 done_search = 1; /* Don't switch modes below! */
1967 goto lq_update;
1968 }
1969
1970 /* (Else) not in search of better modulation mode, try for better
1971 * starting rate, while staying in this mode. */
1972 high_low = iwl4965_rs_get_adjacent_rate(priv, index,
1973 rate_scale_index_msk,
1974 tbl->lq_type);
1975 low = high_low & 0xff;
1976 high = (high_low >> 8) & 0xff;
1977
1978 /* If user set max rate, dont allow higher than user constrain */
1979 if ((lq_sta->max_rate_idx != -1) &&
1980 (lq_sta->max_rate_idx < high))
1981 high = IWL_RATE_INVALID;
1982
1983 sr = window->success_ratio;
1984
1985 /* Collect measured throughputs for current and adjacent rates */
1986 current_tpt = window->average_tpt;
1987 if (low != IWL_RATE_INVALID)
1988 low_tpt = tbl->win[low].average_tpt;
1989 if (high != IWL_RATE_INVALID)
1990 high_tpt = tbl->win[high].average_tpt;
1991
1992 scale_action = 0;
1993
1994 /* Too many failures, decrease rate */
1995 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
1996 IWL_DEBUG_RATE(priv,
1997 "decrease rate because of low success_ratio\n");
1998 scale_action = -1;
1999
2000 /* No throughput measured yet for adjacent rates; try increase. */
2001 } else if ((low_tpt == IWL_INVALID_VALUE) &&
2002 (high_tpt == IWL_INVALID_VALUE)) {
2003
2004 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2005 scale_action = 1;
2006 else if (low != IWL_RATE_INVALID)
2007 scale_action = 0;
2008 }
2009
2010 /* Both adjacent throughputs are measured, but neither one has better
2011 * throughput; we're using the best rate, don't change it! */
2012 else if ((low_tpt != IWL_INVALID_VALUE) &&
2013 (high_tpt != IWL_INVALID_VALUE) &&
2014 (low_tpt < current_tpt) &&
2015 (high_tpt < current_tpt))
2016 scale_action = 0;
2017
2018 /* At least one adjacent rate's throughput is measured,
2019 * and may have better performance. */
2020 else {
2021 /* Higher adjacent rate's throughput is measured */
2022 if (high_tpt != IWL_INVALID_VALUE) {
2023 /* Higher rate has better throughput */
2024 if (high_tpt > current_tpt &&
2025 sr >= IWL_RATE_INCREASE_TH) {
2026 scale_action = 1;
2027 } else {
2028 scale_action = 0;
2029 }
2030
2031 /* Lower adjacent rate's throughput is measured */
2032 } else if (low_tpt != IWL_INVALID_VALUE) {
2033 /* Lower rate has better throughput */
2034 if (low_tpt > current_tpt) {
2035 IWL_DEBUG_RATE(priv,
2036 "decrease rate because of low tpt\n");
2037 scale_action = -1;
2038 } else if (sr >= IWL_RATE_INCREASE_TH) {
2039 scale_action = 1;
2040 }
2041 }
2042 }
2043
2044 /* Sanity check; asked for decrease, but success rate or throughput
2045 * has been good at old rate. Don't change it. */
2046 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2047 ((sr > IWL_RATE_HIGH_TH) ||
2048 (current_tpt > (100 * tbl->expected_tpt[low]))))
2049 scale_action = 0;
2050
2051 switch (scale_action) {
2052 case -1:
2053 /* Decrease starting rate, update uCode's rate table */
2054 if (low != IWL_RATE_INVALID) {
2055 update_lq = 1;
2056 index = low;
2057 }
2058
2059 break;
2060 case 1:
2061 /* Increase starting rate, update uCode's rate table */
2062 if (high != IWL_RATE_INVALID) {
2063 update_lq = 1;
2064 index = high;
2065 }
2066
2067 break;
2068 case 0:
2069 /* No change */
2070 default:
2071 break;
2072 }
2073
2074 IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2075 "high %d type %d\n",
2076 index, scale_action, low, high, tbl->lq_type);
2077
2078lq_update:
2079 /* Replace uCode's rate table for the destination station. */
2080 if (update_lq)
2081 rate = iwl4965_rs_update_rate_tbl(priv, ctx, lq_sta,
2082 tbl, index, is_green);
2083
2084 /* Should we stay with this modulation mode,
2085 * or search for a new one? */
2086 iwl4965_rs_stay_in_table(lq_sta, false);
2087
2088 /*
2089 * Search for new modulation mode if we're:
2090 * 1) Not changing rates right now
2091 * 2) Not just finishing up a search
2092 * 3) Allowing a new search
2093 */
2094 if (!update_lq && !done_search &&
2095 !lq_sta->stay_in_tbl && window->counter) {
2096 /* Save current throughput to compare with "search" throughput*/
2097 lq_sta->last_tpt = current_tpt;
2098
2099 /* Select a new "search" modulation mode to try.
2100 * If one is found, set up the new "search" table. */
2101 if (is_legacy(tbl->lq_type))
2102 iwl4965_rs_move_legacy_other(priv, lq_sta,
2103 conf, sta, index);
2104 else if (is_siso(tbl->lq_type))
2105 iwl4965_rs_move_siso_to_other(priv, lq_sta,
2106 conf, sta, index);
2107 else /* (is_mimo2(tbl->lq_type)) */
2108 iwl4965_rs_move_mimo2_to_other(priv, lq_sta,
2109 conf, sta, index);
2110
2111 /* If new "search" mode was selected, set up in uCode table */
2112 if (lq_sta->search_better_tbl) {
2113 /* Access the "search" table, clear its history. */
2114 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2115 for (i = 0; i < IWL_RATE_COUNT; i++)
2116 iwl4965_rs_rate_scale_clear_window(
2117 &(tbl->win[i]));
2118
2119 /* Use new "search" start rate */
2120 index = iwl4965_hwrate_to_plcp_idx(tbl->current_rate);
2121
2122 IWL_DEBUG_RATE(priv,
2123 "Switch current mcs: %X index: %d\n",
2124 tbl->current_rate, index);
2125 iwl4965_rs_fill_link_cmd(priv, lq_sta,
2126 tbl->current_rate);
2127 iwl_legacy_send_lq_cmd(priv, ctx,
2128 &lq_sta->lq, CMD_ASYNC, false);
2129 } else
2130 done_search = 1;
2131 }
2132
2133 if (done_search && !lq_sta->stay_in_tbl) {
2134 /* If the "active" (non-search) mode was legacy,
2135 * and we've tried switching antennas,
2136 * but we haven't been able to try HT modes (not available),
2137 * stay with best antenna legacy modulation for a while
2138 * before next round of mode comparisons. */
2139 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2140 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2141 lq_sta->action_counter > tbl1->max_search) {
2142 IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2143 iwl4965_rs_set_stay_in_table(priv, 1, lq_sta);
2144 }
2145
2146 /* If we're in an HT mode, and all 3 mode switch actions
2147 * have been tried and compared, stay in this best modulation
2148 * mode for a while before next round of mode comparisons. */
2149 if (lq_sta->enable_counter &&
2150 (lq_sta->action_counter >= tbl1->max_search)) {
2151 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2152 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2153 (tid != MAX_TID_COUNT)) {
2154 tid_data =
2155 &priv->stations[lq_sta->lq.sta_id].tid[tid];
2156 if (tid_data->agg.state == IWL_AGG_OFF) {
2157 IWL_DEBUG_RATE(priv,
2158 "try to aggregate tid %d\n",
2159 tid);
2160 iwl4965_rs_tl_turn_on_agg(priv, tid,
2161 lq_sta, sta);
2162 }
2163 }
2164 iwl4965_rs_set_stay_in_table(priv, 0, lq_sta);
2165 }
2166 }
2167
2168out:
2169 tbl->current_rate = iwl4965_rate_n_flags_from_tbl(priv, tbl,
2170 index, is_green);
2171 i = index;
2172 lq_sta->last_txrate_idx = i;
2173}
2174
2175/**
2176 * iwl4965_rs_initialize_lq - Initialize a station's hardware rate table
2177 *
2178 * The uCode's station table contains a table of fallback rates
2179 * for automatic fallback during transmission.
2180 *
2181 * NOTE: This sets up a default set of values. These will be replaced later
2182 * if the driver's iwl-4965-rs rate scaling algorithm is used, instead of
2183 * rc80211_simple.
2184 *
2185 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2186 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2187 * which requires station table entry to exist).
2188 */
2189static void iwl4965_rs_initialize_lq(struct iwl_priv *priv,
2190 struct ieee80211_conf *conf,
2191 struct ieee80211_sta *sta,
2192 struct iwl_lq_sta *lq_sta)
2193{
2194 struct iwl_scale_tbl_info *tbl;
2195 int rate_idx;
2196 int i;
2197 u32 rate;
2198 u8 use_green = iwl4965_rs_use_green(sta);
2199 u8 active_tbl = 0;
2200 u8 valid_tx_ant;
2201 struct iwl_station_priv *sta_priv;
2202 struct iwl_rxon_context *ctx;
2203
2204 if (!sta || !lq_sta)
2205 return;
2206
2207 sta_priv = (void *)sta->drv_priv;
2208 ctx = sta_priv->common.ctx;
2209
2210 i = lq_sta->last_txrate_idx;
2211
2212 valid_tx_ant = priv->hw_params.valid_tx_ant;
2213
2214 if (!lq_sta->search_better_tbl)
2215 active_tbl = lq_sta->active_tbl;
2216 else
2217 active_tbl = 1 - lq_sta->active_tbl;
2218
2219 tbl = &(lq_sta->lq_info[active_tbl]);
2220
2221 if ((i < 0) || (i >= IWL_RATE_COUNT))
2222 i = 0;
2223
2224 rate = iwlegacy_rates[i].plcp;
2225 tbl->ant_type = iwl4965_first_antenna(valid_tx_ant);
2226 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2227
2228 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2229 rate |= RATE_MCS_CCK_MSK;
2230
2231 iwl4965_rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2232 if (!iwl4965_rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2233 iwl4965_rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2234
2235 rate = iwl4965_rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2236 tbl->current_rate = rate;
2237 iwl4965_rs_set_expected_tpt_table(lq_sta, tbl);
2238 iwl4965_rs_fill_link_cmd(NULL, lq_sta, rate);
2239 priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2240 iwl_legacy_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_SYNC, true);
2241}
2242
2243static void
2244iwl4965_rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2245 struct ieee80211_tx_rate_control *txrc)
2246{
2247
2248 struct sk_buff *skb = txrc->skb;
2249 struct ieee80211_supported_band *sband = txrc->sband;
2250 struct iwl_priv *priv __maybe_unused = (struct iwl_priv *)priv_r;
2251 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2252 struct iwl_lq_sta *lq_sta = priv_sta;
2253 int rate_idx;
2254
2255 IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2256
2257 /* Get max rate if user set max rate */
2258 if (lq_sta) {
2259 lq_sta->max_rate_idx = txrc->max_rate_idx;
2260 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2261 (lq_sta->max_rate_idx != -1))
2262 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2263 if ((lq_sta->max_rate_idx < 0) ||
2264 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2265 lq_sta->max_rate_idx = -1;
2266 }
2267
2268 /* Treat uninitialized rate scaling data same as non-existing. */
2269 if (lq_sta && !lq_sta->drv) {
2270 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
2271 priv_sta = NULL;
2272 }
2273
2274 /* Send management frames and NO_ACK data using lowest rate. */
2275 if (rate_control_send_low(sta, priv_sta, txrc))
2276 return;
2277
2278 if (!lq_sta)
2279 return;
2280
2281 rate_idx = lq_sta->last_txrate_idx;
2282
2283 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2284 rate_idx -= IWL_FIRST_OFDM_RATE;
2285 /* 6M and 9M shared same MCS index */
2286 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2287 if (iwl4965_rs_extract_rate(lq_sta->last_rate_n_flags) >=
2288 IWL_RATE_MIMO2_6M_PLCP)
2289 rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2290 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2291 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2292 info->control.rates[0].flags |=
2293 IEEE80211_TX_RC_SHORT_GI;
2294 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2295 info->control.rates[0].flags |=
2296 IEEE80211_TX_RC_DUP_DATA;
2297 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2298 info->control.rates[0].flags |=
2299 IEEE80211_TX_RC_40_MHZ_WIDTH;
2300 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2301 info->control.rates[0].flags |=
2302 IEEE80211_TX_RC_GREEN_FIELD;
2303 } else {
2304 /* Check for invalid rates */
2305 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2306 ((sband->band == IEEE80211_BAND_5GHZ) &&
2307 (rate_idx < IWL_FIRST_OFDM_RATE)))
2308 rate_idx = rate_lowest_index(sband, sta);
2309 /* On valid 5 GHz rate, adjust index */
2310 else if (sband->band == IEEE80211_BAND_5GHZ)
2311 rate_idx -= IWL_FIRST_OFDM_RATE;
2312 info->control.rates[0].flags = 0;
2313 }
2314 info->control.rates[0].idx = rate_idx;
2315
2316}
2317
2318static void *iwl4965_rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2319 gfp_t gfp)
2320{
2321 struct iwl_lq_sta *lq_sta;
2322 struct iwl_station_priv *sta_priv =
2323 (struct iwl_station_priv *) sta->drv_priv;
2324 struct iwl_priv *priv;
2325
2326 priv = (struct iwl_priv *)priv_rate;
2327 IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2328
2329 lq_sta = &sta_priv->lq_sta;
2330
2331 return lq_sta;
2332}
2333
2334/*
2335 * Called after adding a new station to initialize rate scaling
2336 */
2337void
2338iwl4965_rs_rate_init(struct iwl_priv *priv,
2339 struct ieee80211_sta *sta,
2340 u8 sta_id)
2341{
2342 int i, j;
2343 struct ieee80211_hw *hw = priv->hw;
2344 struct ieee80211_conf *conf = &priv->hw->conf;
2345 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2346 struct iwl_station_priv *sta_priv;
2347 struct iwl_lq_sta *lq_sta;
2348 struct ieee80211_supported_band *sband;
2349
2350 sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2351 lq_sta = &sta_priv->lq_sta;
2352 sband = hw->wiphy->bands[conf->channel->band];
2353
2354
2355 lq_sta->lq.sta_id = sta_id;
2356
2357 for (j = 0; j < LQ_SIZE; j++)
2358 for (i = 0; i < IWL_RATE_COUNT; i++)
2359 iwl4965_rs_rate_scale_clear_window(
2360 &lq_sta->lq_info[j].win[i]);
2361
2362 lq_sta->flush_timer = 0;
2363 lq_sta->supp_rates = sta->supp_rates[sband->band];
2364 for (j = 0; j < LQ_SIZE; j++)
2365 for (i = 0; i < IWL_RATE_COUNT; i++)
2366 iwl4965_rs_rate_scale_clear_window(
2367 &lq_sta->lq_info[j].win[i]);
2368
2369 IWL_DEBUG_RATE(priv, "LQ:"
2370 "*** rate scale station global init for station %d ***\n",
2371 sta_id);
2372 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2373 * the lowest or the highest rate.. Could consider using RSSI from
2374 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2375 * after assoc.. */
2376
2377 lq_sta->is_dup = 0;
2378 lq_sta->max_rate_idx = -1;
2379 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2380 lq_sta->is_green = iwl4965_rs_use_green(sta);
2381 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2382 lq_sta->band = priv->band;
2383 /*
2384 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2385 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2386 */
2387 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2388 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2389 lq_sta->active_siso_rate &= ~((u16)0x2);
2390 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2391
2392 /* Same here */
2393 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2394 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2395 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2396 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2397
2398 /* These values will be overridden later */
2399 lq_sta->lq.general_params.single_stream_ant_msk =
2400 iwl4965_first_antenna(priv->hw_params.valid_tx_ant);
2401 lq_sta->lq.general_params.dual_stream_ant_msk =
2402 priv->hw_params.valid_tx_ant &
2403 ~iwl4965_first_antenna(priv->hw_params.valid_tx_ant);
2404 if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2405 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2406 } else if (iwl4965_num_of_ant(priv->hw_params.valid_tx_ant) == 2) {
2407 lq_sta->lq.general_params.dual_stream_ant_msk =
2408 priv->hw_params.valid_tx_ant;
2409 }
2410
2411 /* as default allow aggregation for all tids */
2412 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2413 lq_sta->drv = priv;
2414
2415 /* Set last_txrate_idx to lowest rate */
2416 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2417 if (sband->band == IEEE80211_BAND_5GHZ)
2418 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2419 lq_sta->is_agg = 0;
2420
2421#ifdef CONFIG_MAC80211_DEBUGFS
2422 lq_sta->dbg_fixed_rate = 0;
2423#endif
2424
2425 iwl4965_rs_initialize_lq(priv, conf, sta, lq_sta);
2426}
2427
2428static void iwl4965_rs_fill_link_cmd(struct iwl_priv *priv,
2429 struct iwl_lq_sta *lq_sta, u32 new_rate)
2430{
2431 struct iwl_scale_tbl_info tbl_type;
2432 int index = 0;
2433 int rate_idx;
2434 int repeat_rate = 0;
2435 u8 ant_toggle_cnt = 0;
2436 u8 use_ht_possible = 1;
2437 u8 valid_tx_ant = 0;
2438 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2439
2440 /* Override starting rate (index 0) if needed for debug purposes */
2441 iwl4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2442
2443 /* Interpret new_rate (rate_n_flags) */
2444 iwl4965_rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2445 &tbl_type, &rate_idx);
2446
2447 /* How many times should we repeat the initial rate? */
2448 if (is_legacy(tbl_type.lq_type)) {
2449 ant_toggle_cnt = 1;
2450 repeat_rate = IWL_NUMBER_TRY;
2451 } else {
2452 repeat_rate = IWL_HT_NUMBER_TRY;
2453 }
2454
2455 lq_cmd->general_params.mimo_delimiter =
2456 is_mimo(tbl_type.lq_type) ? 1 : 0;
2457
2458 /* Fill 1st table entry (index 0) */
2459 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2460
2461 if (iwl4965_num_of_ant(tbl_type.ant_type) == 1) {
2462 lq_cmd->general_params.single_stream_ant_msk =
2463 tbl_type.ant_type;
2464 } else if (iwl4965_num_of_ant(tbl_type.ant_type) == 2) {
2465 lq_cmd->general_params.dual_stream_ant_msk =
2466 tbl_type.ant_type;
2467 } /* otherwise we don't modify the existing value */
2468
2469 index++;
2470 repeat_rate--;
2471 if (priv)
2472 valid_tx_ant = priv->hw_params.valid_tx_ant;
2473
2474 /* Fill rest of rate table */
2475 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2476 /* Repeat initial/next rate.
2477 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2478 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2479 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2480 if (is_legacy(tbl_type.lq_type)) {
2481 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2482 ant_toggle_cnt++;
2483 else if (priv &&
2484 iwl4965_rs_toggle_antenna(valid_tx_ant,
2485 &new_rate, &tbl_type))
2486 ant_toggle_cnt = 1;
2487 }
2488
2489 /* Override next rate if needed for debug purposes */
2490 iwl4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2491
2492 /* Fill next table entry */
2493 lq_cmd->rs_table[index].rate_n_flags =
2494 cpu_to_le32(new_rate);
2495 repeat_rate--;
2496 index++;
2497 }
2498
2499 iwl4965_rs_get_tbl_info_from_mcs(new_rate,
2500 lq_sta->band, &tbl_type,
2501 &rate_idx);
2502
2503 /* Indicate to uCode which entries might be MIMO.
2504 * If initial rate was MIMO, this will finally end up
2505 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2506 if (is_mimo(tbl_type.lq_type))
2507 lq_cmd->general_params.mimo_delimiter = index;
2508
2509 /* Get next rate */
2510 new_rate = iwl4965_rs_get_lower_rate(lq_sta,
2511 &tbl_type, rate_idx,
2512 use_ht_possible);
2513
2514 /* How many times should we repeat the next rate? */
2515 if (is_legacy(tbl_type.lq_type)) {
2516 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2517 ant_toggle_cnt++;
2518 else if (priv &&
2519 iwl4965_rs_toggle_antenna(valid_tx_ant,
2520 &new_rate, &tbl_type))
2521 ant_toggle_cnt = 1;
2522
2523 repeat_rate = IWL_NUMBER_TRY;
2524 } else {
2525 repeat_rate = IWL_HT_NUMBER_TRY;
2526 }
2527
2528 /* Don't allow HT rates after next pass.
2529 * iwl4965_rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2530 use_ht_possible = 0;
2531
2532 /* Override next rate if needed for debug purposes */
2533 iwl4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2534
2535 /* Fill next table entry */
2536 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2537
2538 index++;
2539 repeat_rate--;
2540 }
2541
2542 lq_cmd->agg_params.agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2543 lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2544
2545 lq_cmd->agg_params.agg_time_limit =
2546 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2547}
2548
2549static void
2550*iwl4965_rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2551{
2552 return hw->priv;
2553}
2554/* rate scale requires free function to be implemented */
2555static void iwl4965_rs_free(void *priv_rate)
2556{
2557 return;
2558}
2559
2560static void iwl4965_rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
2561 void *priv_sta)
2562{
2563 struct iwl_priv *priv __maybe_unused = priv_r;
2564
2565 IWL_DEBUG_RATE(priv, "enter\n");
2566 IWL_DEBUG_RATE(priv, "leave\n");
2567}
2568
2569
2570#ifdef CONFIG_MAC80211_DEBUGFS
2571static int iwl4965_open_file_generic(struct inode *inode, struct file *file)
2572{
2573 file->private_data = inode->i_private;
2574 return 0;
2575}
2576static void iwl4965_rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2577 u32 *rate_n_flags, int index)
2578{
2579 struct iwl_priv *priv;
2580 u8 valid_tx_ant;
2581 u8 ant_sel_tx;
2582
2583 priv = lq_sta->drv;
2584 valid_tx_ant = priv->hw_params.valid_tx_ant;
2585 if (lq_sta->dbg_fixed_rate) {
2586 ant_sel_tx =
2587 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
2588 >> RATE_MCS_ANT_POS);
2589 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
2590 *rate_n_flags = lq_sta->dbg_fixed_rate;
2591 IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
2592 } else {
2593 lq_sta->dbg_fixed_rate = 0;
2594 IWL_ERR(priv,
2595 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
2596 ant_sel_tx, valid_tx_ant);
2597 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
2598 }
2599 } else {
2600 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
2601 }
2602}
2603
2604static ssize_t iwl4965_rs_sta_dbgfs_scale_table_write(struct file *file,
2605 const char __user *user_buf, size_t count, loff_t *ppos)
2606{
2607 struct iwl_lq_sta *lq_sta = file->private_data;
2608 struct iwl_priv *priv;
2609 char buf[64];
2610 size_t buf_size;
2611 u32 parsed_rate;
2612 struct iwl_station_priv *sta_priv =
2613 container_of(lq_sta, struct iwl_station_priv, lq_sta);
2614 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
2615
2616 priv = lq_sta->drv;
2617 memset(buf, 0, sizeof(buf));
2618 buf_size = min(count, sizeof(buf) - 1);
2619 if (copy_from_user(buf, user_buf, buf_size))
2620 return -EFAULT;
2621
2622 if (sscanf(buf, "%x", &parsed_rate) == 1)
2623 lq_sta->dbg_fixed_rate = parsed_rate;
2624 else
2625 lq_sta->dbg_fixed_rate = 0;
2626
2627 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2628 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2629 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2630
2631 IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
2632 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2633
2634 if (lq_sta->dbg_fixed_rate) {
2635 iwl4965_rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2636 iwl_legacy_send_lq_cmd(lq_sta->drv, ctx, &lq_sta->lq, CMD_ASYNC,
2637 false);
2638 }
2639
2640 return count;
2641}
2642
2643static ssize_t iwl4965_rs_sta_dbgfs_scale_table_read(struct file *file,
2644 char __user *user_buf, size_t count, loff_t *ppos)
2645{
2646 char *buff;
2647 int desc = 0;
2648 int i = 0;
2649 int index = 0;
2650 ssize_t ret;
2651
2652 struct iwl_lq_sta *lq_sta = file->private_data;
2653 struct iwl_priv *priv;
2654 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2655
2656 priv = lq_sta->drv;
2657 buff = kmalloc(1024, GFP_KERNEL);
2658 if (!buff)
2659 return -ENOMEM;
2660
2661 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2662 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2663 lq_sta->total_failed, lq_sta->total_success,
2664 lq_sta->active_legacy_rate);
2665 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2666 lq_sta->dbg_fixed_rate);
2667 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
2668 (priv->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
2669 (priv->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
2670 (priv->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
2671 desc += sprintf(buff+desc, "lq type %s\n",
2672 (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
2673 if (is_Ht(tbl->lq_type)) {
2674 desc += sprintf(buff+desc, " %s",
2675 (is_siso(tbl->lq_type)) ? "SISO" : "MIMO2");
2676 desc += sprintf(buff+desc, " %s",
2677 (tbl->is_ht40) ? "40MHz" : "20MHz");
2678 desc += sprintf(buff+desc, " %s %s %s\n",
2679 (tbl->is_SGI) ? "SGI" : "",
2680 (lq_sta->is_green) ? "GF enabled" : "",
2681 (lq_sta->is_agg) ? "AGG on" : "");
2682 }
2683 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
2684 lq_sta->last_rate_n_flags);
2685 desc += sprintf(buff+desc, "general:"
2686 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2687 lq_sta->lq.general_params.flags,
2688 lq_sta->lq.general_params.mimo_delimiter,
2689 lq_sta->lq.general_params.single_stream_ant_msk,
2690 lq_sta->lq.general_params.dual_stream_ant_msk);
2691
2692 desc += sprintf(buff+desc, "agg:"
2693 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2694 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2695 lq_sta->lq.agg_params.agg_dis_start_th,
2696 lq_sta->lq.agg_params.agg_frame_cnt_limit);
2697
2698 desc += sprintf(buff+desc,
2699 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2700 lq_sta->lq.general_params.start_rate_index[0],
2701 lq_sta->lq.general_params.start_rate_index[1],
2702 lq_sta->lq.general_params.start_rate_index[2],
2703 lq_sta->lq.general_params.start_rate_index[3]);
2704
2705 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2706 index = iwl4965_hwrate_to_plcp_idx(
2707 le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2708 if (is_legacy(tbl->lq_type)) {
2709 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
2710 i,
2711 le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
2712 iwl_rate_mcs[index].mbps);
2713 } else {
2714 desc += sprintf(buff+desc,
2715 " rate[%d] 0x%X %smbps (%s)\n",
2716 i,
2717 le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
2718 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
2719 }
2720 }
2721
2722 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2723 kfree(buff);
2724 return ret;
2725}
2726
2727static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2728 .write = iwl4965_rs_sta_dbgfs_scale_table_write,
2729 .read = iwl4965_rs_sta_dbgfs_scale_table_read,
2730 .open = iwl4965_open_file_generic,
2731 .llseek = default_llseek,
2732};
2733static ssize_t iwl4965_rs_sta_dbgfs_stats_table_read(struct file *file,
2734 char __user *user_buf, size_t count, loff_t *ppos)
2735{
2736 char *buff;
2737 int desc = 0;
2738 int i, j;
2739 ssize_t ret;
2740
2741 struct iwl_lq_sta *lq_sta = file->private_data;
2742
2743 buff = kmalloc(1024, GFP_KERNEL);
2744 if (!buff)
2745 return -ENOMEM;
2746
2747 for (i = 0; i < LQ_SIZE; i++) {
2748 desc += sprintf(buff+desc,
2749 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
2750 "rate=0x%X\n",
2751 lq_sta->active_tbl == i ? "*" : "x",
2752 lq_sta->lq_info[i].lq_type,
2753 lq_sta->lq_info[i].is_SGI,
2754 lq_sta->lq_info[i].is_ht40,
2755 lq_sta->lq_info[i].is_dup,
2756 lq_sta->is_green,
2757 lq_sta->lq_info[i].current_rate);
2758 for (j = 0; j < IWL_RATE_COUNT; j++) {
2759 desc += sprintf(buff+desc,
2760 "counter=%d success=%d %%=%d\n",
2761 lq_sta->lq_info[i].win[j].counter,
2762 lq_sta->lq_info[i].win[j].success_counter,
2763 lq_sta->lq_info[i].win[j].success_ratio);
2764 }
2765 }
2766 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2767 kfree(buff);
2768 return ret;
2769}
2770
2771static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2772 .read = iwl4965_rs_sta_dbgfs_stats_table_read,
2773 .open = iwl4965_open_file_generic,
2774 .llseek = default_llseek,
2775};
2776
2777static ssize_t iwl4965_rs_sta_dbgfs_rate_scale_data_read(struct file *file,
2778 char __user *user_buf, size_t count, loff_t *ppos)
2779{
2780 char buff[120];
2781 int desc = 0;
2782 ssize_t ret;
2783
2784 struct iwl_lq_sta *lq_sta = file->private_data;
2785 struct iwl_priv *priv;
2786 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
2787
2788 priv = lq_sta->drv;
2789
2790 if (is_Ht(tbl->lq_type))
2791 desc += sprintf(buff+desc,
2792 "Bit Rate= %d Mb/s\n",
2793 tbl->expected_tpt[lq_sta->last_txrate_idx]);
2794 else
2795 desc += sprintf(buff+desc,
2796 "Bit Rate= %d Mb/s\n",
2797 iwlegacy_rates[lq_sta->last_txrate_idx].ieee >> 1);
2798
2799 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2800 return ret;
2801}
2802
2803static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
2804 .read = iwl4965_rs_sta_dbgfs_rate_scale_data_read,
2805 .open = iwl4965_open_file_generic,
2806 .llseek = default_llseek,
2807};
2808
2809static void iwl4965_rs_add_debugfs(void *priv, void *priv_sta,
2810 struct dentry *dir)
2811{
2812 struct iwl_lq_sta *lq_sta = priv_sta;
2813 lq_sta->rs_sta_dbgfs_scale_table_file =
2814 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
2815 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2816 lq_sta->rs_sta_dbgfs_stats_table_file =
2817 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
2818 lq_sta, &rs_sta_dbgfs_stats_table_ops);
2819 lq_sta->rs_sta_dbgfs_rate_scale_data_file =
2820 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
2821 lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
2822 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2823 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
2824 &lq_sta->tx_agg_tid_en);
2825
2826}
2827
2828static void iwl4965_rs_remove_debugfs(void *priv, void *priv_sta)
2829{
2830 struct iwl_lq_sta *lq_sta = priv_sta;
2831 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2832 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2833 debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
2834 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2835}
2836#endif
2837
2838/*
2839 * Initialization of rate scaling information is done by driver after
2840 * the station is added. Since mac80211 calls this function before a
2841 * station is added we ignore it.
2842 */
2843static void
2844iwl4965_rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband,
2845 struct ieee80211_sta *sta, void *priv_sta)
2846{
2847}
2848static struct rate_control_ops rs_4965_ops = {
2849 .module = NULL,
2850 .name = IWL4965_RS_NAME,
2851 .tx_status = iwl4965_rs_tx_status,
2852 .get_rate = iwl4965_rs_get_rate,
2853 .rate_init = iwl4965_rs_rate_init_stub,
2854 .alloc = iwl4965_rs_alloc,
2855 .free = iwl4965_rs_free,
2856 .alloc_sta = iwl4965_rs_alloc_sta,
2857 .free_sta = iwl4965_rs_free_sta,
2858#ifdef CONFIG_MAC80211_DEBUGFS
2859 .add_sta_debugfs = iwl4965_rs_add_debugfs,
2860 .remove_sta_debugfs = iwl4965_rs_remove_debugfs,
2861#endif
2862};
2863
2864int iwl4965_rate_control_register(void)
2865{
2866 return ieee80211_rate_control_register(&rs_4965_ops);
2867}
2868
2869void iwl4965_rate_control_unregister(void)
2870{
2871 ieee80211_rate_control_unregister(&rs_4965_ops);
2872}