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[PATCH] iwlwifi: limit printouts on hot path
[deliverable/linux.git] / drivers / net / wireless / iwlwifi / iwl-4965-rs.c
CommitLineData
b481de9c
ZY		 1/******************************************************************************
2 *
3 * Copyright(c) 2005 - 2007 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 * James P. Ketrenos <ipw2100-admin@linux.intel.com>
23 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
24 *
25 *****************************************************************************/
26#include <linux/kernel.h>
27#include <linux/init.h>
28#include <linux/skbuff.h>
29#include <linux/wireless.h>
30#include <net/mac80211.h>
31#include <net/ieee80211.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 <net/mac80211.h>
40#include <linux/wireless.h>
41
1156b2c6
ZY		 42#define IWL 4965
43
b481de9c
ZY		 44#include "../net/mac80211/ieee80211_rate.h"
45
46#include "iwlwifi.h"
47#include "iwl-helpers.h"
48
49#define RS_NAME "iwl-4965-rs"
50
51#define NUM_TRY_BEFORE_ANTENNA_TOGGLE 1
52#define IWL_NUMBER_TRY 1
53#define IWL_HT_NUMBER_TRY 3
54
55#define IWL_RATE_MAX_WINDOW 62
56#define IWL_RATE_HIGH_TH 10880
57#define IWL_RATE_MIN_FAILURE_TH 6
58#define IWL_RATE_MIN_SUCCESS_TH 8
59#define IWL_RATE_DECREASE_TH 1920
60#define IWL_RATE_INCREASE_TH 8960
61#define IWL_RATE_SCALE_FLUSH_INTVL (2*HZ) /*2 seconds */
62
63static u8 rs_ht_to_legacy[] = {
64 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
65 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
66 IWL_RATE_6M_INDEX,
67 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
68 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
69 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
70 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
71};
72
73struct iwl_rate {
74 u32 rate_n_flags;
75} __attribute__ ((packed));
76
77struct iwl_rate_scale_data {
78 u64 data;
79 s32 success_counter;
80 s32 success_ratio;
81 s32 counter;
82 s32 average_tpt;
83 unsigned long stamp;
84};
85
86struct iwl_scale_tbl_info {
87 enum iwl_table_type lq_type;
88 enum iwl_antenna_type antenna_type;
89 u8 is_SGI;
90 u8 is_fat;
91 u8 is_dup;
92 u8 action;
93 s32 *expected_tpt;
94 struct iwl_rate current_rate;
95 struct iwl_rate_scale_data win[IWL_RATE_COUNT];
96};
97
98struct iwl_rate_scale_priv {
99 u8 active_tbl;
100 u8 enable_counter;
101 u8 stay_in_tbl;
102 u8 search_better_tbl;
103 s32 last_tpt;
104 u32 table_count_limit;
105 u32 max_failure_limit;
106 u32 max_success_limit;
107 u32 table_count;
108 u32 total_failed;
109 u32 total_success;
110 u32 flush_timer;
111 u8 action_counter;
112 u8 antenna;
113 u8 valid_antenna;
114 u8 is_green;
115 u8 is_dup;
116 u8 phymode;
117 u8 ibss_sta_added;
118 u16 active_rate;
119 u16 active_siso_rate;
120 u16 active_mimo_rate;
121 u16 active_rate_basic;
122 struct iwl_link_quality_cmd lq;
123 struct iwl_scale_tbl_info lq_info[LQ_SIZE];
5ae212c9
ZY		 124#ifdef CONFIG_MAC80211_DEBUGFS
125 struct dentry *rs_sta_dbgfs_scale_table_file;
126#endif
b481de9c
ZY		 127};
128
129static void rs_rate_scale_perform(struct iwl_priv *priv,
130 struct net_device *dev,
131 struct ieee80211_hdr *hdr,
132 struct sta_info *sta);
133static int rs_fill_link_cmd(struct iwl_rate_scale_priv *lq_data,
134 struct iwl_rate *tx_mcs,
135 struct iwl_link_quality_cmd *tbl,
136 struct sta_info *sta);
137
138
139static s32 expected_tpt_A[IWL_RATE_COUNT] = {
140 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
141};
142
143static s32 expected_tpt_G[IWL_RATE_COUNT] = {
144 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
145};
146
147static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
148 0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
149};
150
151static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
152 0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
153};
154
155static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
156 0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
157};
158
159static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
160 0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
161};
162
163static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
164 0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
165};
166
167static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
168 0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
169};
170
171static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
172 0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
173};
174
175static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
176 0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
177};
178
179static int iwl_lq_sync_callback(struct iwl_priv *priv,
180 struct iwl_cmd *cmd, struct sk_buff *skb)
181{
182 /*We didn't cache the SKB; let the caller free it */
183 return 1;
184}
185
186static inline u8 iwl_rate_get_rate(u32 rate_n_flags)
187{
188 return (u8)(rate_n_flags & 0xFF);
189}
190
191static int rs_send_lq_cmd(struct iwl_priv *priv,
192 struct iwl_link_quality_cmd *lq, u8 flags)
193{
194#ifdef CONFIG_IWLWIFI_DEBUG
195 int i;
196#endif
197 int rc = -1;
198
199 struct iwl_host_cmd cmd = {
200 .id = REPLY_TX_LINK_QUALITY_CMD,
201 .len = sizeof(struct iwl_link_quality_cmd),
202 .meta.flags = flags,
203 .data = lq,
204 };
205
206 if ((lq->sta_id == 0xFF) &&
207 (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
208 return rc;
209
210 if (lq->sta_id == 0xFF)
211 lq->sta_id = IWL_AP_ID;
212
213 IWL_DEBUG_RATE("lq station id 0x%x\n", lq->sta_id);
214 IWL_DEBUG_RATE("lq dta 0x%X 0x%X\n",
215 lq->general_params.single_stream_ant_msk,
216 lq->general_params.dual_stream_ant_msk);
217#ifdef CONFIG_IWLWIFI_DEBUG
218 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
219 IWL_DEBUG_RATE("lq index %d 0x%X\n",
220 i, lq->rs_table[i].rate_n_flags);
221#endif
222
223 if (flags & CMD_ASYNC)
224 cmd.meta.u.callback = iwl_lq_sync_callback;
225
226 if (iwl_is_associated(priv) && priv->assoc_station_added &&
227 priv->lq_mngr.lq_ready)
228 rc = iwl_send_cmd(priv, &cmd);
229
230 return rc;
231}
232
233static int rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
234{
235 window->data = 0;
236 window->success_counter = 0;
237 window->success_ratio = IWL_INVALID_VALUE;
238 window->counter = 0;
239 window->average_tpt = IWL_INVALID_VALUE;
240 window->stamp = 0;
241
242 return 0;
243}
244
245static int rs_collect_tx_data(struct iwl_rate_scale_data *windows,
246 int scale_index, s32 tpt, u32 status)
247{
248 int rc = 0;
249 struct iwl_rate_scale_data *window = NULL;
250 u64 mask;
251 u8 win_size = IWL_RATE_MAX_WINDOW;
252 s32 fail_count;
253
254 if (scale_index < 0)
255 return -1;
256
257 if (scale_index >= IWL_RATE_COUNT)
258 return -1;
259
260 window = &(windows[scale_index]);
261
262 if (window->counter >= win_size) {
263
264 window->counter = win_size - 1;
265 mask = 1;
266 mask = (mask << (win_size - 1));
267 if ((window->data & mask)) {
268 window->data &= ~mask;
269 window->success_counter = window->success_counter - 1;
270 }
271 }
272
273 window->counter = window->counter + 1;
274 mask = window->data;
275 window->data = (mask << 1);
276 if (status != 0) {
277 window->success_counter = window->success_counter + 1;
278 window->data |= 0x1;
279 }
280
281 if (window->counter > 0)
282 window->success_ratio = 128 * (100 * window->success_counter)
283 / window->counter;
284 else
285 window->success_ratio = IWL_INVALID_VALUE;
286
287 fail_count = window->counter - window->success_counter;
288
289 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
290 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
291 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
292 else
293 window->average_tpt = IWL_INVALID_VALUE;
294
295 window->stamp = jiffies;
296
297 return rc;
298}
299
300int static rs_mcs_from_tbl(struct iwl_rate *mcs_rate,
301 struct iwl_scale_tbl_info *tbl,
302 int index, u8 use_green)
303{
304 int rc = 0;
305
306 if (is_legacy(tbl->lq_type)) {
307 mcs_rate->rate_n_flags = iwl_rates[index].plcp;
308 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
309 mcs_rate->rate_n_flags |= RATE_MCS_CCK_MSK;
310
311 } else if (is_siso(tbl->lq_type)) {
312 if (index > IWL_LAST_OFDM_RATE)
313 index = IWL_LAST_OFDM_RATE;
314 mcs_rate->rate_n_flags = iwl_rates[index].plcp_siso |
315 RATE_MCS_HT_MSK;
316 } else {
317 if (index > IWL_LAST_OFDM_RATE)
318 index = IWL_LAST_OFDM_RATE;
319 mcs_rate->rate_n_flags = iwl_rates[index].plcp_mimo |
320 RATE_MCS_HT_MSK;
321 }
322
323 switch (tbl->antenna_type) {
324 case ANT_BOTH:
325 mcs_rate->rate_n_flags |= RATE_MCS_ANT_AB_MSK;
326 break;
327 case ANT_MAIN:
328 mcs_rate->rate_n_flags |= RATE_MCS_ANT_A_MSK;
329 break;
330 case ANT_AUX:
331 mcs_rate->rate_n_flags |= RATE_MCS_ANT_B_MSK;
332 break;
333 case ANT_NONE:
334 break;
335 }
336
337 if (is_legacy(tbl->lq_type))
338 return rc;
339
340 if (tbl->is_fat) {
341 if (tbl->is_dup)
342 mcs_rate->rate_n_flags |= RATE_MCS_DUP_MSK;
343 else
344 mcs_rate->rate_n_flags |= RATE_MCS_FAT_MSK;
345 }
346 if (tbl->is_SGI)
347 mcs_rate->rate_n_flags |= RATE_MCS_SGI_MSK;
348
349 if (use_green) {
350 mcs_rate->rate_n_flags |= RATE_MCS_GF_MSK;
351 if (is_siso(tbl->lq_type))
352 mcs_rate->rate_n_flags &= ~RATE_MCS_SGI_MSK;
353 }
354 return rc;
355}
356
357static int rs_get_tbl_info_from_mcs(const struct iwl_rate *mcs_rate,
358 int phymode, struct iwl_scale_tbl_info *tbl,
359 int *rate_idx)
360{
361 int index;
362 u32 ant_msk;
363
364 index = iwl_rate_index_from_plcp(mcs_rate->rate_n_flags);
365
366 if (index == IWL_RATE_INVALID) {
367 *rate_idx = -1;
368 return -1;
369 }
370 tbl->is_SGI = 0;
371 tbl->is_fat = 0;
372 tbl->is_dup = 0;
373 tbl->antenna_type = ANT_BOTH;
374
375 if (!(mcs_rate->rate_n_flags & RATE_MCS_HT_MSK)) {
376 ant_msk = (mcs_rate->rate_n_flags & RATE_MCS_ANT_AB_MSK);
377
378 if (ant_msk == RATE_MCS_ANT_AB_MSK)
379 tbl->lq_type = LQ_NONE;
380 else {
381
382 if (phymode == MODE_IEEE80211A)
383 tbl->lq_type = LQ_A;
384 else
385 tbl->lq_type = LQ_G;
386
387 if (mcs_rate->rate_n_flags & RATE_MCS_ANT_A_MSK)
388 tbl->antenna_type = ANT_MAIN;
389 else
390 tbl->antenna_type = ANT_AUX;
391 }
392 *rate_idx = index;
393
394 } else if (iwl_rate_get_rate(mcs_rate->rate_n_flags)
395 <= IWL_RATE_SISO_60M_PLCP) {
396 tbl->lq_type = LQ_SISO;
397
398 ant_msk = (mcs_rate->rate_n_flags & RATE_MCS_ANT_AB_MSK);
399 if (ant_msk == RATE_MCS_ANT_AB_MSK)
400 tbl->lq_type = LQ_NONE;
401 else {
402 if (mcs_rate->rate_n_flags & RATE_MCS_ANT_A_MSK)
403 tbl->antenna_type = ANT_MAIN;
404 else
405 tbl->antenna_type = ANT_AUX;
406 }
407 if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK)
408 tbl->is_SGI = 1;
409
410 if ((mcs_rate->rate_n_flags & RATE_MCS_FAT_MSK) ||
411 (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK))
412 tbl->is_fat = 1;
413
414 if (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK)
415 tbl->is_dup = 1;
416
417 *rate_idx = index;
418 } else {
419 tbl->lq_type = LQ_MIMO;
420 if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK)
421 tbl->is_SGI = 1;
422
423 if ((mcs_rate->rate_n_flags & RATE_MCS_FAT_MSK) ||
424 (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK))
425 tbl->is_fat = 1;
426
427 if (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK)
428 tbl->is_dup = 1;
429 *rate_idx = index;
430 }
431 return 0;
432}
433
434static inline void rs_toggle_antenna(struct iwl_rate *new_rate,
435 struct iwl_scale_tbl_info *tbl)
436{
437 if (tbl->antenna_type == ANT_AUX) {
438 tbl->antenna_type = ANT_MAIN;
439 new_rate->rate_n_flags &= ~RATE_MCS_ANT_B_MSK;
440 new_rate->rate_n_flags |= RATE_MCS_ANT_A_MSK;
441 } else {
442 tbl->antenna_type = ANT_AUX;
443 new_rate->rate_n_flags &= ~RATE_MCS_ANT_A_MSK;
444 new_rate->rate_n_flags |= RATE_MCS_ANT_B_MSK;
445 }
446}
447
448static inline s8 rs_use_green(struct iwl_priv *priv)
449{
450 s8 rc = 0;
451#ifdef CONFIG_IWLWIFI_HT
452 if (!priv->is_ht_enabled || !priv->current_assoc_ht.is_ht)
453 return 0;
454
455 if ((priv->current_assoc_ht.is_green_field) &&
456 !(priv->current_assoc_ht.operating_mode & 0x4))
457 rc = 1;
458#endif /*CONFIG_IWLWIFI_HT */
459 return rc;
460}
461
462/**
463 * rs_get_supported_rates - get the available rates
464 *
465 * if management frame or broadcast frame only return
466 * basic available rates.
467 *
468 */
469static void rs_get_supported_rates(struct iwl_rate_scale_priv *lq_data,
470 struct ieee80211_hdr *hdr,
471 enum iwl_table_type rate_type,
472 u16 *data_rate)
473{
474 if (is_legacy(rate_type))
475 *data_rate = lq_data->active_rate;
476 else {
477 if (is_siso(rate_type))
478 *data_rate = lq_data->active_siso_rate;
479 else
480 *data_rate = lq_data->active_mimo_rate;
481 }
482
483 if (hdr && is_multicast_ether_addr(hdr->addr1) &&
484 lq_data->active_rate_basic)
485 *data_rate = lq_data->active_rate_basic;
486}
487
488static u16 rs_get_adjacent_rate(u8 index, u16 rate_mask, int rate_type)
489{
490 u8 high = IWL_RATE_INVALID;
491 u8 low = IWL_RATE_INVALID;
492
493 /* 802.11A or ht walks to the next literal adjascent rate in
494 * the rate table */
495 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
496 int i;
497 u32 mask;
498
499 /* Find the previous rate that is in the rate mask */
500 i = index - 1;
501 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
502 if (rate_mask & mask) {
503 low = i;
504 break;
505 }
506 }
507
508 /* Find the next rate that is in the rate mask */
509 i = index + 1;
510 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
511 if (rate_mask & mask) {
512 high = i;
513 break;
514 }
515 }
516
517 return (high << 8) | low;
518 }
519
520 low = index;
521 while (low != IWL_RATE_INVALID) {
522 low = iwl_rates[low].prev_rs;
523 if (low == IWL_RATE_INVALID)
524 break;
525 if (rate_mask & (1 << low))
526 break;
527 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
528 }
529
530 high = index;
531 while (high != IWL_RATE_INVALID) {
532 high = iwl_rates[high].next_rs;
533 if (high == IWL_RATE_INVALID)
534 break;
535 if (rate_mask & (1 << high))
536 break;
537 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
538 }
539
540 return (high << 8) | low;
541}
542
543static int rs_get_lower_rate(struct iwl_rate_scale_priv *lq_data,
544 struct iwl_scale_tbl_info *tbl, u8 scale_index,
545 u8 ht_possible, struct iwl_rate *mcs_rate,
546 struct sta_info *sta)
547{
548 u8 is_green = lq_data->is_green;
549 s32 low;
550 u16 rate_mask;
551 u16 high_low;
552 u8 switch_to_legacy = 0;
553
554 /* check if we need to switch from HT to legacy rates.
555 * assumption is that mandatory rates (1Mbps or 6Mbps)
556 * are always supported (spec demand) */
557 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
558 switch_to_legacy = 1;
559 scale_index = rs_ht_to_legacy[scale_index];
560 if (lq_data->phymode == MODE_IEEE80211A)
561 tbl->lq_type = LQ_A;
562 else
563 tbl->lq_type = LQ_G;
564
565 if ((tbl->antenna_type == ANT_BOTH) ||
566 (tbl->antenna_type == ANT_NONE))
567 tbl->antenna_type = ANT_MAIN;
568
569 tbl->is_fat = 0;
570 tbl->is_SGI = 0;
571 }
572
573 rs_get_supported_rates(lq_data, NULL, tbl->lq_type, &rate_mask);
574
575 /* mask with station rate restriction */
576 if (is_legacy(tbl->lq_type)) {
577 if (lq_data->phymode == (u8) MODE_IEEE80211A)
578 rate_mask = (u16)(rate_mask &
579 (sta->supp_rates << IWL_FIRST_OFDM_RATE));
580 else
581 rate_mask = (u16)(rate_mask & sta->supp_rates);
582 }
583
584 /* if we did switched from HT to legacy check current rate */
585 if ((switch_to_legacy) &&
586 (rate_mask & (1 << scale_index))) {
587 rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green);
588 return 0;
589 }
590
591 high_low = rs_get_adjacent_rate(scale_index, rate_mask, tbl->lq_type);
592 low = high_low & 0xff;
593
594 if (low != IWL_RATE_INVALID)
595 rs_mcs_from_tbl(mcs_rate, tbl, low, is_green);
596 else
597 rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green);
598
599 return 0;
600}
601
602static void rs_tx_status(void *priv_rate,
603 struct net_device *dev,
604 struct sk_buff *skb,
605 struct ieee80211_tx_status *tx_resp)
606{
607 int status;
608 u8 retries;
609 int rs_index, index = 0;
610 struct iwl_rate_scale_priv *lq;
611 struct iwl_link_quality_cmd *table;
612 struct sta_info *sta;
613 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
614 struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
615 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
616 struct iwl_rate_scale_data *window = NULL;
617 struct iwl_rate_scale_data *search_win = NULL;
618 struct iwl_rate tx_mcs;
619 struct iwl_scale_tbl_info tbl_type;
620 struct iwl_scale_tbl_info *curr_tbl, *search_tbl;
621 u8 active_index = 0;
622 u16 fc = le16_to_cpu(hdr->frame_control);
623 s32 tpt = 0;
624
58826351 625 IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
b481de9c
ZY		 626
627 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1))
628 return;
629
630 retries = tx_resp->retry_count;
631
632 if (retries > 15)
633 retries = 15;
634
635
636 sta = sta_info_get(local, hdr->addr1);
637
638 if (!sta || !sta->rate_ctrl_priv) {
639 if (sta)
640 sta_info_put(sta);
641 return;
642 }
643
644 lq = (struct iwl_rate_scale_priv *)sta->rate_ctrl_priv;
645
646 if (!priv->lq_mngr.lq_ready)
647 return;
648
649 if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) && !lq->ibss_sta_added)
650 return;
651
652 table = &lq->lq;
653 active_index = lq->active_tbl;
654
655 lq->antenna = (lq->valid_antenna & local->hw.conf.antenna_sel_tx);
656 if (!lq->antenna)
657 lq->antenna = lq->valid_antenna;
658
659 lq->antenna = lq->valid_antenna;
660 curr_tbl = &(lq->lq_info[active_index]);
661 search_tbl = &(lq->lq_info[(1 - active_index)]);
662 window = (struct iwl_rate_scale_data *)
663 &(curr_tbl->win[0]);
664 search_win = (struct iwl_rate_scale_data *)
665 &(search_tbl->win[0]);
666
667 tx_mcs.rate_n_flags = tx_resp->control.tx_rate;
668
669 rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode,
670 &tbl_type, &rs_index);
671 if ((rs_index < 0) || (rs_index >= IWL_RATE_COUNT)) {
672 IWL_DEBUG_RATE("bad rate index at: %d rate 0x%X\n",
673 rs_index, tx_mcs.rate_n_flags);
674 sta_info_put(sta);
675 return;
676 }
677
678 if (retries &&
679 (tx_mcs.rate_n_flags !=
680 le32_to_cpu(table->rs_table[0].rate_n_flags))) {
681 IWL_DEBUG_RATE("initial rate does not match 0x%x 0x%x\n",
682 tx_mcs.rate_n_flags,
683 le32_to_cpu(table->rs_table[0].rate_n_flags));
684 sta_info_put(sta);
685 return;
686 }
687
688 while (retries) {
689 tx_mcs.rate_n_flags =
690 le32_to_cpu(table->rs_table[index].rate_n_flags);
691 rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode,
692 &tbl_type, &rs_index);
693
694 if ((tbl_type.lq_type == search_tbl->lq_type) &&
695 (tbl_type.antenna_type == search_tbl->antenna_type) &&
696 (tbl_type.is_SGI == search_tbl->is_SGI)) {
697 if (search_tbl->expected_tpt)
698 tpt = search_tbl->expected_tpt[rs_index];
699 else
700 tpt = 0;
701 rs_collect_tx_data(search_win,
702 rs_index, tpt, 0);
703 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
704 (tbl_type.antenna_type == curr_tbl->antenna_type) &&
705 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
706 if (curr_tbl->expected_tpt)
707 tpt = curr_tbl->expected_tpt[rs_index];
708 else
709 tpt = 0;
710 rs_collect_tx_data(window, rs_index, tpt, 0);
711 }
712 if (lq->stay_in_tbl)
713 lq->total_failed++;
714 --retries;
715 index++;
716
717 }
718
719 if (!tx_resp->retry_count)
720 tx_mcs.rate_n_flags = tx_resp->control.tx_rate;
721 else
722 tx_mcs.rate_n_flags =
723 le32_to_cpu(table->rs_table[index].rate_n_flags);
724
725 rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode,
726 &tbl_type, &rs_index);
727
728 if (tx_resp->flags & IEEE80211_TX_STATUS_ACK)
729 status = 1;
730 else
731 status = 0;
732
733 if ((tbl_type.lq_type == search_tbl->lq_type) &&
734 (tbl_type.antenna_type == search_tbl->antenna_type) &&
735 (tbl_type.is_SGI == search_tbl->is_SGI)) {
736 if (search_tbl->expected_tpt)
737 tpt = search_tbl->expected_tpt[rs_index];
738 else
739 tpt = 0;
740 rs_collect_tx_data(search_win,
741 rs_index, tpt, status);
742 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
743 (tbl_type.antenna_type == curr_tbl->antenna_type) &&
744 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
745 if (curr_tbl->expected_tpt)
746 tpt = curr_tbl->expected_tpt[rs_index];
747 else
748 tpt = 0;
749 rs_collect_tx_data(window, rs_index, tpt, status);
750 }
751
752 if (lq->stay_in_tbl) {
753 if (status)
754 lq->total_success++;
755 else
756 lq->total_failed++;
757 }
758
759 rs_rate_scale_perform(priv, dev, hdr, sta);
760 sta_info_put(sta);
761 return;
762}
763
764static u8 rs_is_ant_connected(u8 valid_antenna,
765 enum iwl_antenna_type antenna_type)
766{
767 if (antenna_type == ANT_AUX)
768 return ((valid_antenna & 0x2) ? 1:0);
769 else if (antenna_type == ANT_MAIN)
770 return ((valid_antenna & 0x1) ? 1:0);
771 else if (antenna_type == ANT_BOTH) {
772 if ((valid_antenna & 0x3) == 0x3)
773 return 1;
774 else
775 return 0;
776 }
777
778 return 1;
779}
780
781static u8 rs_is_other_ant_connected(u8 valid_antenna,
782 enum iwl_antenna_type antenna_type)
783{
784 if (antenna_type == ANT_AUX)
785 return (rs_is_ant_connected(valid_antenna, ANT_MAIN));
786 else
787 return (rs_is_ant_connected(valid_antenna, ANT_AUX));
788
789 return 0;
790}
791
792static void rs_set_stay_in_table(u8 is_legacy,
793 struct iwl_rate_scale_priv *lq_data)
794{
795 IWL_DEBUG_HT("we are staying in the same table\n");
796 lq_data->stay_in_tbl = 1;
797 if (is_legacy) {
798 lq_data->table_count_limit = IWL_LEGACY_TABLE_COUNT;
799 lq_data->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
800 lq_data->max_success_limit = IWL_LEGACY_TABLE_COUNT;
801 } else {
802 lq_data->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
803 lq_data->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
804 lq_data->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
805 }
806 lq_data->table_count = 0;
807 lq_data->total_failed = 0;
808 lq_data->total_success = 0;
809}
810
811static void rs_get_expected_tpt_table(struct iwl_rate_scale_priv *lq_data,
812 struct iwl_scale_tbl_info *tbl)
813{
814 if (is_legacy(tbl->lq_type)) {
815 if (!is_a_band(tbl->lq_type))
816 tbl->expected_tpt = expected_tpt_G;
817 else
818 tbl->expected_tpt = expected_tpt_A;
819 } else if (is_siso(tbl->lq_type)) {
820 if (tbl->is_fat && !lq_data->is_dup)
821 if (tbl->is_SGI)
822 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
823 else
824 tbl->expected_tpt = expected_tpt_siso40MHz;
825 else if (tbl->is_SGI)
826 tbl->expected_tpt = expected_tpt_siso20MHzSGI;
827 else
828 tbl->expected_tpt = expected_tpt_siso20MHz;
829
830 } else if (is_mimo(tbl->lq_type)) {
831 if (tbl->is_fat && !lq_data->is_dup)
832 if (tbl->is_SGI)
833 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
834 else
835 tbl->expected_tpt = expected_tpt_mimo40MHz;
836 else if (tbl->is_SGI)
837 tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
838 else
839 tbl->expected_tpt = expected_tpt_mimo20MHz;
840 } else
841 tbl->expected_tpt = expected_tpt_G;
842}
843
844#ifdef CONFIG_IWLWIFI_HT
845static s32 rs_get_best_rate(struct iwl_priv *priv,
846 struct iwl_rate_scale_priv *lq_data,
847 struct iwl_scale_tbl_info *tbl,
848 u16 rate_mask, s8 index, s8 rate)
849{
850 struct iwl_scale_tbl_info *active_tbl =
851 &(lq_data->lq_info[lq_data->active_tbl]);
852 s32 new_rate, high, low, start_hi;
853 s32 active_sr = active_tbl->win[index].success_ratio;
854 s32 *tpt_tbl = tbl->expected_tpt;
855 s32 active_tpt = active_tbl->expected_tpt[index];
856 u16 high_low;
857
858 new_rate = high = low = start_hi = IWL_RATE_INVALID;
859
860 for (; ;) {
861 high_low = rs_get_adjacent_rate(rate, rate_mask, tbl->lq_type);
862
863 low = high_low & 0xff;
864 high = (high_low >> 8) & 0xff;
865
866 if ((((100 * tpt_tbl[rate]) > lq_data->last_tpt) &&
867 ((active_sr > IWL_RATE_DECREASE_TH) &&
868 (active_sr <= IWL_RATE_HIGH_TH) &&
869 (tpt_tbl[rate] <= active_tpt))) ||
870 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
871 (tpt_tbl[rate] > active_tpt))) {
872
873 if (start_hi != IWL_RATE_INVALID) {
874 new_rate = start_hi;
875 break;
876 }
877 new_rate = rate;
878 if (low != IWL_RATE_INVALID)
879 rate = low;
880 else
881 break;
882 } else {
883 if (new_rate != IWL_RATE_INVALID)
884 break;
885 else if (high != IWL_RATE_INVALID) {
886 start_hi = high;
887 rate = high;
888 } else {
889 new_rate = rate;
890 break;
891 }
892 }
893 }
894
895 return new_rate;
896}
897#endif /* CONFIG_IWLWIFI_HT */
898
899static inline u8 rs_is_both_ant_supp(u8 valid_antenna)
900{
901 return (rs_is_ant_connected(valid_antenna, ANT_BOTH));
902}
903
904static int rs_switch_to_mimo(struct iwl_priv *priv,
905 struct iwl_rate_scale_priv *lq_data,
906 struct iwl_scale_tbl_info *tbl, int index)
907{
908 int rc = -1;
909#ifdef CONFIG_IWLWIFI_HT
910 u16 rate_mask;
911 s32 rate;
912 s8 is_green = lq_data->is_green;
913
914 if (!priv->is_ht_enabled || !priv->current_assoc_ht.is_ht)
915 return -1;
916
917 IWL_DEBUG_HT("LQ: try to switch to MIMO\n");
918 tbl->lq_type = LQ_MIMO;
919 rs_get_supported_rates(lq_data, NULL, tbl->lq_type,
920 &rate_mask);
921
922 if (priv->current_assoc_ht.tx_mimo_ps_mode == IWL_MIMO_PS_STATIC)
923 return -1;
924
925 if (!rs_is_both_ant_supp(lq_data->antenna))
926 return -1;
927
928 rc = 0;
929 tbl->is_dup = lq_data->is_dup;
930 tbl->action = 0;
931 if (priv->current_channel_width == IWL_CHANNEL_WIDTH_40MHZ)
932 tbl->is_fat = 1;
933 else
934 tbl->is_fat = 0;
935
936 if (tbl->is_fat) {
937 if (priv->current_assoc_ht.sgf & HT_SHORT_GI_40MHZ_ONLY)
938 tbl->is_SGI = 1;
939 else
940 tbl->is_SGI = 0;
941 } else if (priv->current_assoc_ht.sgf & HT_SHORT_GI_20MHZ_ONLY)
942 tbl->is_SGI = 1;
943 else
944 tbl->is_SGI = 0;
945
946 rs_get_expected_tpt_table(lq_data, tbl);
947
948 rate = rs_get_best_rate(priv, lq_data, tbl, rate_mask, index, index);
949
950 IWL_DEBUG_HT("LQ: MIMO best rate %d mask %X\n", rate, rate_mask);
951 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask))
952 return -1;
953 rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green);
954
955 IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
956 tbl->current_rate.rate_n_flags, is_green);
957
958#endif /*CONFIG_IWLWIFI_HT */
959 return rc;
960}
961
962static int rs_switch_to_siso(struct iwl_priv *priv,
963 struct iwl_rate_scale_priv *lq_data,
964 struct iwl_scale_tbl_info *tbl, int index)
965{
966 int rc = -1;
967#ifdef CONFIG_IWLWIFI_HT
968 u16 rate_mask;
969 u8 is_green = lq_data->is_green;
970 s32 rate;
971
972 IWL_DEBUG_HT("LQ: try to switch to SISO\n");
973 if (!priv->is_ht_enabled || !priv->current_assoc_ht.is_ht)
974 return -1;
975
976 rc = 0;
977 tbl->is_dup = lq_data->is_dup;
978 tbl->lq_type = LQ_SISO;
979 tbl->action = 0;
980 rs_get_supported_rates(lq_data, NULL, tbl->lq_type,
981 &rate_mask);
982
983 if (priv->current_channel_width == IWL_CHANNEL_WIDTH_40MHZ)
984 tbl->is_fat = 1;
985 else
986 tbl->is_fat = 0;
987
988 if (tbl->is_fat) {
989 if (priv->current_assoc_ht.sgf & HT_SHORT_GI_40MHZ_ONLY)
990 tbl->is_SGI = 1;
991 else
992 tbl->is_SGI = 0;
993 } else if (priv->current_assoc_ht.sgf & HT_SHORT_GI_20MHZ_ONLY)
994 tbl->is_SGI = 1;
995 else
996 tbl->is_SGI = 0;
997
998 if (is_green)
999 tbl->is_SGI = 0;
1000
1001 rs_get_expected_tpt_table(lq_data, tbl);
1002 rate = rs_get_best_rate(priv, lq_data, tbl, rate_mask, index, index);
1003
1004 IWL_DEBUG_HT("LQ: get best rate %d mask %X\n", rate, rate_mask);
1005 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1006 IWL_DEBUG_HT("can not switch with index %d rate mask %x\n",
1007 rate, rate_mask);
1008 return -1;
1009 }
1010 rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green);
1011 IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
1012 tbl->current_rate.rate_n_flags, is_green);
1013
1014#endif /*CONFIG_IWLWIFI_HT */
1015 return rc;
1016}
1017
1018static int rs_move_legacy_other(struct iwl_priv *priv,
1019 struct iwl_rate_scale_priv *lq_data,
1020 int index)
1021{
1022 int rc = 0;
1023 struct iwl_scale_tbl_info *tbl =
1024 &(lq_data->lq_info[lq_data->active_tbl]);
1025 struct iwl_scale_tbl_info *search_tbl =
1026 &(lq_data->lq_info[(1 - lq_data->active_tbl)]);
1027 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1028 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1029 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1030 u8 start_action = tbl->action;
1031
1032 for (; ;) {
1033 switch (tbl->action) {
1034 case IWL_LEGACY_SWITCH_ANTENNA:
1035 IWL_DEBUG_HT("LQ Legacy switch Antenna\n");
1036
1037 search_tbl->lq_type = LQ_NONE;
1038 lq_data->action_counter++;
1039 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1040 break;
1041 if (!rs_is_other_ant_connected(lq_data->antenna,
1042 tbl->antenna_type))
1043 break;
1044
1045 memcpy(search_tbl, tbl, sz);
1046
1047 rs_toggle_antenna(&(search_tbl->current_rate),
1048 search_tbl);
1049 rs_get_expected_tpt_table(lq_data, search_tbl);
1050 lq_data->search_better_tbl = 1;
1051 goto out;
1052
1053 case IWL_LEGACY_SWITCH_SISO:
1054 IWL_DEBUG_HT("LQ: Legacy switch to SISO\n");
1055 memcpy(search_tbl, tbl, sz);
1056 search_tbl->lq_type = LQ_SISO;
1057 search_tbl->is_SGI = 0;
1058 search_tbl->is_fat = 0;
1059 rc = rs_switch_to_siso(priv, lq_data, search_tbl,
1060 index);
1061 if (!rc) {
1062 lq_data->search_better_tbl = 1;
1063 lq_data->action_counter = 0;
1064 }
1065 if (!rc)
1066 goto out;
1067
1068 break;
1069 case IWL_LEGACY_SWITCH_MIMO:
1070 IWL_DEBUG_HT("LQ: Legacy switch MIMO\n");
1071 memcpy(search_tbl, tbl, sz);
1072 search_tbl->lq_type = LQ_MIMO;
1073 search_tbl->is_SGI = 0;
1074 search_tbl->is_fat = 0;
1075 search_tbl->antenna_type = ANT_BOTH;
1076 rc = rs_switch_to_mimo(priv, lq_data, search_tbl,
1077 index);
1078 if (!rc) {
1079 lq_data->search_better_tbl = 1;
1080 lq_data->action_counter = 0;
1081 }
1082 if (!rc)
1083 goto out;
1084 break;
1085 }
1086 tbl->action++;
1087 if (tbl->action > IWL_LEGACY_SWITCH_MIMO)
1088 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1089
1090 if (tbl->action == start_action)
1091 break;
1092
1093 }
1094 return 0;
1095
1096 out:
1097 tbl->action++;
1098 if (tbl->action > IWL_LEGACY_SWITCH_MIMO)
1099 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1100 return 0;
1101
1102}
1103
1104static int rs_move_siso_to_other(struct iwl_priv *priv,
1105 struct iwl_rate_scale_priv *lq_data,
1106 int index)
1107{
1108 int rc = -1;
1109 u8 is_green = lq_data->is_green;
1110 struct iwl_scale_tbl_info *tbl =
1111 &(lq_data->lq_info[lq_data->active_tbl]);
1112 struct iwl_scale_tbl_info *search_tbl =
1113 &(lq_data->lq_info[(1 - lq_data->active_tbl)]);
1114 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1115 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1116 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1117 u8 start_action = tbl->action;
1118
1119 for (;;) {
1120 lq_data->action_counter++;
1121 switch (tbl->action) {
1122 case IWL_SISO_SWITCH_ANTENNA:
1123 IWL_DEBUG_HT("LQ: SISO SWITCH ANTENNA SISO\n");
1124 search_tbl->lq_type = LQ_NONE;
1125 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1126 break;
1127 if (!rs_is_other_ant_connected(lq_data->antenna,
1128 tbl->antenna_type))
1129 break;
1130
1131 memcpy(search_tbl, tbl, sz);
1132 search_tbl->action = IWL_SISO_SWITCH_MIMO;
1133 rs_toggle_antenna(&(search_tbl->current_rate),
1134 search_tbl);
1135 lq_data->search_better_tbl = 1;
1136
1137 goto out;
1138
1139 case IWL_SISO_SWITCH_MIMO:
1140 IWL_DEBUG_HT("LQ: SISO SWITCH TO MIMO FROM SISO\n");
1141 memcpy(search_tbl, tbl, sz);
1142 search_tbl->lq_type = LQ_MIMO;
1143 search_tbl->is_SGI = 0;
1144 search_tbl->is_fat = 0;
1145 search_tbl->antenna_type = ANT_BOTH;
1146 rc = rs_switch_to_mimo(priv, lq_data, search_tbl,
1147 index);
1148 if (!rc)
1149 lq_data->search_better_tbl = 1;
1150
1151 if (!rc)
1152 goto out;
1153 break;
1154 case IWL_SISO_SWITCH_GI:
1155 IWL_DEBUG_HT("LQ: SISO SWITCH TO GI\n");
1156 memcpy(search_tbl, tbl, sz);
1157 search_tbl->action = 0;
1158 if (search_tbl->is_SGI)
1159 search_tbl->is_SGI = 0;
1160 else if (!is_green)
1161 search_tbl->is_SGI = 1;
1162 else
1163 break;
1164 lq_data->search_better_tbl = 1;
1165 if ((tbl->lq_type == LQ_SISO) &&
1166 (tbl->is_SGI)) {
1167 s32 tpt = lq_data->last_tpt / 100;
1168 if (((!tbl->is_fat) &&
1169 (tpt >= expected_tpt_siso20MHz[index])) ||
1170 ((tbl->is_fat) &&
1171 (tpt >= expected_tpt_siso40MHz[index])))
1172 lq_data->search_better_tbl = 0;
1173 }
1174 rs_get_expected_tpt_table(lq_data, search_tbl);
1175 rs_mcs_from_tbl(&search_tbl->current_rate,
1176 search_tbl, index, is_green);
1177 goto out;
1178 }
1179 tbl->action++;
1180 if (tbl->action > IWL_SISO_SWITCH_GI)
1181 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1182
1183 if (tbl->action == start_action)
1184 break;
1185 }
1186 return 0;
1187
1188 out:
1189 tbl->action++;
1190 if (tbl->action > IWL_SISO_SWITCH_GI)
1191 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1192 return 0;
1193}
1194
1195static int rs_move_mimo_to_other(struct iwl_priv *priv,
1196 struct iwl_rate_scale_priv *lq_data,
1197 int index)
1198{
1199 int rc = -1;
1200 s8 is_green = lq_data->is_green;
1201 struct iwl_scale_tbl_info *tbl =
1202 &(lq_data->lq_info[lq_data->active_tbl]);
1203 struct iwl_scale_tbl_info *search_tbl =
1204 &(lq_data->lq_info[(1 - lq_data->active_tbl)]);
1205 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1206 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1207 u8 start_action = tbl->action;
1208
1209 for (;;) {
1210 lq_data->action_counter++;
1211 switch (tbl->action) {
1212 case IWL_MIMO_SWITCH_ANTENNA_A:
1213 case IWL_MIMO_SWITCH_ANTENNA_B:
1214 IWL_DEBUG_HT("LQ: MIMO SWITCH TO SISO\n");
1215 memcpy(search_tbl, tbl, sz);
1216 search_tbl->lq_type = LQ_SISO;
1217 search_tbl->is_SGI = 0;
1218 search_tbl->is_fat = 0;
1219 if (tbl->action == IWL_MIMO_SWITCH_ANTENNA_A)
1220 search_tbl->antenna_type = ANT_MAIN;
1221 else
1222 search_tbl->antenna_type = ANT_AUX;
1223
1224 rc = rs_switch_to_siso(priv, lq_data, search_tbl,
1225 index);
1226 if (!rc) {
1227 lq_data->search_better_tbl = 1;
1228 goto out;
1229 }
1230 break;
1231
1232 case IWL_MIMO_SWITCH_GI:
1233 IWL_DEBUG_HT("LQ: MIMO SWITCH TO GI\n");
1234 memcpy(search_tbl, tbl, sz);
1235 search_tbl->lq_type = LQ_MIMO;
1236 search_tbl->antenna_type = ANT_BOTH;
1237 search_tbl->action = 0;
1238 if (search_tbl->is_SGI)
1239 search_tbl->is_SGI = 0;
1240 else
1241 search_tbl->is_SGI = 1;
1242 lq_data->search_better_tbl = 1;
1243 if ((tbl->lq_type == LQ_MIMO) &&
1244 (tbl->is_SGI)) {
1245 s32 tpt = lq_data->last_tpt / 100;
1246 if (((!tbl->is_fat) &&
1247 (tpt >= expected_tpt_mimo20MHz[index])) ||
1248 ((tbl->is_fat) &&
1249 (tpt >= expected_tpt_mimo40MHz[index])))
1250 lq_data->search_better_tbl = 0;
1251 }
1252 rs_get_expected_tpt_table(lq_data, search_tbl);
1253 rs_mcs_from_tbl(&search_tbl->current_rate,
1254 search_tbl, index, is_green);
1255 goto out;
1256
1257 }
1258 tbl->action++;
1259 if (tbl->action > IWL_MIMO_SWITCH_GI)
1260 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1261
1262 if (tbl->action == start_action)
1263 break;
1264 }
1265
1266 return 0;
1267 out:
1268 tbl->action++;
1269 if (tbl->action > IWL_MIMO_SWITCH_GI)
1270 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1271 return 0;
1272
1273}
1274
1275static void rs_stay_in_table(struct iwl_rate_scale_priv *lq_data)
1276{
1277 struct iwl_scale_tbl_info *tbl;
1278 int i;
1279 int active_tbl;
1280 int flush_interval_passed = 0;
1281
1282 active_tbl = lq_data->active_tbl;
1283
1284 tbl = &(lq_data->lq_info[active_tbl]);
1285
1286 if (lq_data->stay_in_tbl) {
1287
1288 if (lq_data->flush_timer)
1289 flush_interval_passed =
1290 time_after(jiffies,
1291 (unsigned long)(lq_data->flush_timer +
1292 IWL_RATE_SCALE_FLUSH_INTVL));
1293
1294 flush_interval_passed = 0;
1295 if ((lq_data->total_failed > lq_data->max_failure_limit) ||
1296 (lq_data->total_success > lq_data->max_success_limit) ||
1297 ((!lq_data->search_better_tbl) && (lq_data->flush_timer)
1298 && (flush_interval_passed))) {
1299 IWL_DEBUG_HT("LQ: stay is expired %d %d %d\n:",
1300 lq_data->total_failed,
1301 lq_data->total_success,
1302 flush_interval_passed);
1303 lq_data->stay_in_tbl = 0;
1304 lq_data->total_failed = 0;
1305 lq_data->total_success = 0;
1306 lq_data->flush_timer = 0;
1307 } else if (lq_data->table_count > 0) {
1308 lq_data->table_count++;
1309 if (lq_data->table_count >=
1310 lq_data->table_count_limit) {
1311 lq_data->table_count = 0;
1312
1313 IWL_DEBUG_HT("LQ: stay in table clear win\n");
1314 for (i = 0; i < IWL_RATE_COUNT; i++)
1315 rs_rate_scale_clear_window(
1316 &(tbl->win[i]));
1317 }
1318 }
1319
1320 if (!lq_data->stay_in_tbl) {
1321 for (i = 0; i < IWL_RATE_COUNT; i++)
1322 rs_rate_scale_clear_window(&(tbl->win[i]));
1323 }
1324 }
1325}
1326
1327static void rs_rate_scale_perform(struct iwl_priv *priv,
1328 struct net_device *dev,
1329 struct ieee80211_hdr *hdr,
1330 struct sta_info *sta)
1331{
1332 int low = IWL_RATE_INVALID;
1333 int high = IWL_RATE_INVALID;
1334 int index;
1335 int i;
1336 struct iwl_rate_scale_data *window = NULL;
1337 int current_tpt = IWL_INVALID_VALUE;
1338 int low_tpt = IWL_INVALID_VALUE;
1339 int high_tpt = IWL_INVALID_VALUE;
1340 u32 fail_count;
1341 s8 scale_action = 0;
1342 u16 fc, rate_mask;
1343 u8 update_lq = 0;
1344 struct iwl_rate_scale_priv *lq_data;
1345 struct iwl_scale_tbl_info *tbl, *tbl1;
1346 u16 rate_scale_index_msk = 0;
1347 struct iwl_rate mcs_rate;
1348 u8 is_green = 0;
1349 u8 active_tbl = 0;
1350 u8 done_search = 0;
1351 u16 high_low;
1352
1353 IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1354
1355 fc = le16_to_cpu(hdr->frame_control);
1356 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
1357 /* Send management frames and broadcast/multicast data using
1358 * lowest rate. */
1359 /* TODO: this could probably be improved.. */
1360 return;
1361 }
1362
1363 if (!sta || !sta->rate_ctrl_priv)
1364 return;
1365
1366 if (!priv->lq_mngr.lq_ready) {
1367 IWL_DEBUG_RATE("still rate scaling not ready\n");
1368 return;
1369 }
1370 lq_data = (struct iwl_rate_scale_priv *)sta->rate_ctrl_priv;
1371
1372 if (!lq_data->search_better_tbl)
1373 active_tbl = lq_data->active_tbl;
1374 else
1375 active_tbl = 1 - lq_data->active_tbl;
1376
1377 tbl = &(lq_data->lq_info[active_tbl]);
1378 is_green = lq_data->is_green;
1379
1380 index = sta->last_txrate;
1381
1382 IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1383 tbl->lq_type);
1384
1385 rs_get_supported_rates(lq_data, hdr, tbl->lq_type,
1386 &rate_mask);
1387
1388 IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1389
1390 /* mask with station rate restriction */
1391 if (is_legacy(tbl->lq_type)) {
1392 if (lq_data->phymode == (u8) MODE_IEEE80211A)
1393 rate_scale_index_msk = (u16) (rate_mask &
1394 (sta->supp_rates << IWL_FIRST_OFDM_RATE));
1395 else
1396 rate_scale_index_msk = (u16) (rate_mask &
1397 sta->supp_rates);
1398
1399 } else
1400 rate_scale_index_msk = rate_mask;
1401
1402 if (!rate_scale_index_msk)
1403 rate_scale_index_msk = rate_mask;
1404
1405 if (index < 0 || !((1 << index) & rate_scale_index_msk)) {
1406 index = IWL_INVALID_VALUE;
1407 update_lq = 1;
1408
1409 /* get the lowest availabe rate */
1410 for (i = 0; i <= IWL_RATE_COUNT; i++) {
1411 if ((1 << i) & rate_scale_index_msk)
1412 index = i;
1413 }
1414
1415 if (index == IWL_INVALID_VALUE) {
1416 IWL_WARNING("Can not find a suitable rate\n");
1417 return;
1418 }
1419 }
1420
1421 if (!tbl->expected_tpt)
1422 rs_get_expected_tpt_table(lq_data, tbl);
1423
1424 window = &(tbl->win[index]);
1425
1426 fail_count = window->counter - window->success_counter;
1427 if (((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1428 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH))
1429 || (tbl->expected_tpt == NULL)) {
1430 IWL_DEBUG_RATE("LQ: still below TH succ %d total %d "
1431 "for index %d\n",
1432 window->success_counter, window->counter, index);
1433 window->average_tpt = IWL_INVALID_VALUE;
1434 rs_stay_in_table(lq_data);
1435 if (update_lq) {
1436 rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green);
1437 rs_fill_link_cmd(lq_data, &mcs_rate, &lq_data->lq, sta);
1438 rs_send_lq_cmd(priv, &lq_data->lq, CMD_ASYNC);
1439 }
1440 goto out;
1441
1442 } else
1443 window->average_tpt = ((window->success_ratio *
1444 tbl->expected_tpt[index] + 64) / 128);
1445
1446 if (lq_data->search_better_tbl) {
1447 int success_limit = IWL_RATE_SCALE_SWITCH;
1448
1449 if ((window->success_ratio > success_limit) ||
1450 (window->average_tpt > lq_data->last_tpt)) {
1451 if (!is_legacy(tbl->lq_type)) {
1452 IWL_DEBUG_HT("LQ: we are switching to HT"
1453 " rate suc %d current tpt %d"
1454 " old tpt %d\n",
1455 window->success_ratio,
1456 window->average_tpt,
1457 lq_data->last_tpt);
1458 lq_data->enable_counter = 1;
1459 }
1460 lq_data->active_tbl = active_tbl;
1461 current_tpt = window->average_tpt;
1462 } else {
1463 tbl->lq_type = LQ_NONE;
1464 active_tbl = lq_data->active_tbl;
1465 tbl = &(lq_data->lq_info[active_tbl]);
1466
1467 index = iwl_rate_index_from_plcp(
1468 tbl->current_rate.rate_n_flags);
1469
1470 update_lq = 1;
1471 current_tpt = lq_data->last_tpt;
1472 IWL_DEBUG_HT("XXY GO BACK TO OLD TABLE\n");
1473 }
1474 lq_data->search_better_tbl = 0;
1475 done_search = 1;
1476 goto lq_update;
1477 }
1478
1479 high_low = rs_get_adjacent_rate(index, rate_scale_index_msk,
1480 tbl->lq_type);
1481 low = high_low & 0xff;
1482 high = (high_low >> 8) & 0xff;
1483
1484 current_tpt = window->average_tpt;
1485
1486 if (low != IWL_RATE_INVALID)
1487 low_tpt = tbl->win[low].average_tpt;
1488
1489 if (high != IWL_RATE_INVALID)
1490 high_tpt = tbl->win[high].average_tpt;
1491
1492
1493 scale_action = 1;
1494
1495 if ((window->success_ratio <= IWL_RATE_DECREASE_TH) ||
1496 (current_tpt == 0)) {
1497 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1498 scale_action = -1;
1499 } else if ((low_tpt == IWL_INVALID_VALUE) &&
1500 (high_tpt == IWL_INVALID_VALUE))
1501 scale_action = 1;
1502 else if ((low_tpt != IWL_INVALID_VALUE) &&
1503 (high_tpt != IWL_INVALID_VALUE) &&
1504 (low_tpt < current_tpt) &&
1505 (high_tpt < current_tpt))
1506 scale_action = 0;
1507 else {
1508 if (high_tpt != IWL_INVALID_VALUE) {
1509 if (high_tpt > current_tpt)
1510 scale_action = 1;
1511 else {
1512 IWL_DEBUG_RATE
1513 ("decrease rate because of high tpt\n");
1514 scale_action = -1;
1515 }
1516 } else if (low_tpt != IWL_INVALID_VALUE) {
1517 if (low_tpt > current_tpt) {
1518 IWL_DEBUG_RATE
1519 ("decrease rate because of low tpt\n");
1520 scale_action = -1;
1521 } else
1522 scale_action = 1;
1523 }
1524 }
1525
1526 if (scale_action == -1) {
1527 if ((low != IWL_RATE_INVALID) &&
1528 ((window->success_ratio > IWL_RATE_HIGH_TH) ||
1529 (current_tpt > (100 * tbl->expected_tpt[low]))))
1530 scale_action = 0;
1531 } else if ((scale_action == 1) &&
1532 (window->success_ratio < IWL_RATE_INCREASE_TH))
1533 scale_action = 0;
1534
1535 switch (scale_action) {
1536 case -1:
1537 if (low != IWL_RATE_INVALID) {
1538 update_lq = 1;
1539 index = low;
1540 }
1541 break;
1542 case 1:
1543 if (high != IWL_RATE_INVALID) {
1544 update_lq = 1;
1545 index = high;
1546 }
1547
1548 break;
1549 case 0:
1550 default:
1551 break;
1552 }
1553
1554 IWL_DEBUG_HT("choose rate scale index %d action %d low %d "
1555 "high %d type %d\n",
1556 index, scale_action, low, high, tbl->lq_type);
1557
1558 lq_update:
1559 if (update_lq) {
1560 rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green);
1561 rs_fill_link_cmd(lq_data, &mcs_rate, &lq_data->lq, sta);
1562 rs_send_lq_cmd(priv, &lq_data->lq, CMD_ASYNC);
1563 }
1564 rs_stay_in_table(lq_data);
1565
1566 if (!update_lq && !done_search && !lq_data->stay_in_tbl) {
1567 lq_data->last_tpt = current_tpt;
1568
1569 if (is_legacy(tbl->lq_type))
1570 rs_move_legacy_other(priv, lq_data, index);
1571 else if (is_siso(tbl->lq_type))
1572 rs_move_siso_to_other(priv, lq_data, index);
1573 else
1574 rs_move_mimo_to_other(priv, lq_data, index);
1575
1576 if (lq_data->search_better_tbl) {
1577 tbl = &(lq_data->lq_info[(1 - lq_data->active_tbl)]);
1578 for (i = 0; i < IWL_RATE_COUNT; i++)
1579 rs_rate_scale_clear_window(&(tbl->win[i]));
1580
1581 index = iwl_rate_index_from_plcp(
1582 tbl->current_rate.rate_n_flags);
1583
1584 IWL_DEBUG_HT("Switch current mcs: %X index: %d\n",
1585 tbl->current_rate.rate_n_flags, index);
1586 rs_fill_link_cmd(lq_data, &tbl->current_rate,
1587 &(lq_data->lq), sta);
1588 rs_send_lq_cmd(priv, &lq_data->lq, CMD_ASYNC);
1589 }
1590 tbl1 = &(lq_data->lq_info[lq_data->active_tbl]);
1591
1592 if (is_legacy(tbl1->lq_type) &&
1593#ifdef CONFIG_IWLWIFI_HT
1594 !priv->current_assoc_ht.is_ht &&
1595#endif
1596 (lq_data->action_counter >= 1)) {
1597 lq_data->action_counter = 0;
1598 IWL_DEBUG_HT("LQ: STAY in legacy table\n");
1599 rs_set_stay_in_table(1, lq_data);
1600 }
1601
1602 if (lq_data->enable_counter &&
1603 (lq_data->action_counter >= IWL_ACTION_LIMIT)) {
1604#ifdef CONFIG_IWLWIFI_HT_AGG
1605 if ((lq_data->last_tpt > TID_AGG_TPT_THREHOLD) &&
1606 (priv->lq_mngr.agg_ctrl.auto_agg)) {
1607 priv->lq_mngr.agg_ctrl.tid_retry =
1608 TID_ALL_SPECIFIED;
1609 schedule_work(&priv->agg_work);
1610 }
1611#endif /*CONFIG_IWLWIFI_HT_AGG */
1612 lq_data->action_counter = 0;
1613 rs_set_stay_in_table(0, lq_data);
1614 }
1615 } else {
1616 if ((!update_lq) && (!done_search) && (!lq_data->flush_timer))
1617 lq_data->flush_timer = jiffies;
1618 }
1619
1620out:
1621 rs_mcs_from_tbl(&tbl->current_rate, tbl, index, is_green);
1622 i = index;
1623 sta->last_txrate = i;
1624
1625 /* sta->txrate is an index to A mode rates which start
1626 * at IWL_FIRST_OFDM_RATE
1627 */
1628 if (lq_data->phymode == (u8) MODE_IEEE80211A)
1629 sta->txrate = i - IWL_FIRST_OFDM_RATE;
1630 else
1631 sta->txrate = i;
1632
1633 return;
1634}
1635
1636
1637static void rs_initialize_lq(struct iwl_priv *priv,
1638 struct sta_info *sta)
1639{
1640 int i;
1641 struct iwl_rate_scale_priv *lq;
1642 struct iwl_scale_tbl_info *tbl;
1643 u8 active_tbl = 0;
1644 int rate_idx;
1645 u8 use_green = rs_use_green(priv);
1646 struct iwl_rate mcs_rate;
1647
1648 if (!sta || !sta->rate_ctrl_priv)
1649 goto out;
1650
1651 lq = (struct iwl_rate_scale_priv *)sta->rate_ctrl_priv;
1652 i = sta->last_txrate;
1653
1654 if ((lq->lq.sta_id == 0xff) &&
1655 (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
1656 goto out;
1657
1658 if (!lq->search_better_tbl)
1659 active_tbl = lq->active_tbl;
1660 else
1661 active_tbl = 1 - lq->active_tbl;
1662
1663 tbl = &(lq->lq_info[active_tbl]);
1664
1665 if ((i < 0) || (i >= IWL_RATE_COUNT))
1666 i = 0;
1667
1668 mcs_rate.rate_n_flags = iwl_rates[i].plcp ;
1669 mcs_rate.rate_n_flags |= RATE_MCS_ANT_B_MSK;
1670 mcs_rate.rate_n_flags &= ~RATE_MCS_ANT_A_MSK;
1671
1672 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
1673 mcs_rate.rate_n_flags |= RATE_MCS_CCK_MSK;
1674
1675 tbl->antenna_type = ANT_AUX;
1676 rs_get_tbl_info_from_mcs(&mcs_rate, priv->phymode, tbl, &rate_idx);
1677 if (!rs_is_ant_connected(priv->valid_antenna, tbl->antenna_type))
46640a8c 1678 rs_toggle_antenna(&mcs_rate, tbl);
b481de9c
ZY		 1679
1680 rs_mcs_from_tbl(&mcs_rate, tbl, rate_idx, use_green);
1681 tbl->current_rate.rate_n_flags = mcs_rate.rate_n_flags;
1682 rs_get_expected_tpt_table(lq, tbl);
1683 rs_fill_link_cmd(lq, &mcs_rate, &(lq->lq), sta);
1684 rs_send_lq_cmd(priv, &lq->lq, CMD_ASYNC);
1685 out:
1686 return;
1687}
1688
1689static struct ieee80211_rate *rs_get_lowest_rate(struct ieee80211_local
1690 *local)
1691{
1692 struct ieee80211_hw_mode *mode = local->oper_hw_mode;
1693 int i;
1694
1695 for (i = 0; i < mode->num_rates; i++) {
1696 struct ieee80211_rate *rate = &mode->rates[i];
1697
1698 if (rate->flags & IEEE80211_RATE_SUPPORTED)
1699 return rate;
1700 }
1701
1702 return &mode->rates[0];
1703}
1704
1705static struct ieee80211_rate *rs_get_rate(void *priv_rate,
1706 struct net_device *dev,
1707 struct sk_buff *skb,
1708 struct rate_control_extra
1709 *extra)
1710{
1711
1712 int i;
1713 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1714 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1715 struct sta_info *sta;
1716 u16 fc;
1717 struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
1718 struct iwl_rate_scale_priv *lq;
1719
58826351 1720 IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
b481de9c
ZY		 1721
1722 memset(extra, 0, sizeof(*extra));
1723
1724 fc = le16_to_cpu(hdr->frame_control);
1725 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
1726 /* Send management frames and broadcast/multicast data using
1727 * lowest rate. */
1728 /* TODO: this could probably be improved.. */
1729 return rs_get_lowest_rate(local);
1730 }
1731
1732 sta = sta_info_get(local, hdr->addr1);
1733
1734 if (!sta || !sta->rate_ctrl_priv) {
1735 if (sta)
1736 sta_info_put(sta);
1737 return rs_get_lowest_rate(local);
1738 }
1739
1740 lq = (struct iwl_rate_scale_priv *)sta->rate_ctrl_priv;
1741 i = sta->last_txrate;
1742
1743 if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) && !lq->ibss_sta_added) {
1744 u8 sta_id = iwl_hw_find_station(priv, hdr->addr1);
0795af57 1745 DECLARE_MAC_BUF(mac);
b481de9c
ZY		 1746
1747 if (sta_id == IWL_INVALID_STATION) {
0795af57
JP		 1748 IWL_DEBUG_RATE("LQ: ADD station %s\n",
1749 print_mac(mac, hdr->addr1));
b481de9c
ZY		 1750 sta_id = iwl_add_station(priv,
1751 hdr->addr1, 0, CMD_ASYNC);
1752 }
1753 if ((sta_id != IWL_INVALID_STATION)) {
1754 lq->lq.sta_id = sta_id;
1755 lq->lq.rs_table[0].rate_n_flags = 0;
1756 lq->ibss_sta_added = 1;
1757 rs_initialize_lq(priv, sta);
1758 }
1759 if (!lq->ibss_sta_added)
1760 goto done;
1761 }
1762
1763 done:
1764 sta_info_put(sta);
1765 if ((i < 0) || (i > IWL_RATE_COUNT))
1766 return rs_get_lowest_rate(local);
1767
1768 return &priv->ieee_rates[i];
1769}
1770
1771static void *rs_alloc_sta(void *priv, gfp_t gfp)
1772{
1773 struct iwl_rate_scale_priv *crl;
1774 int i, j;
1775
1776 IWL_DEBUG_RATE("create station rate scale window\n");
1777
1778 crl = kzalloc(sizeof(struct iwl_rate_scale_priv), gfp);
1779
1780 if (crl == NULL)
1781 return NULL;
b481de9c
ZY		 1782 crl->lq.sta_id = 0xff;
1783
63fddb9f 1784
b481de9c
ZY		 1785 for (j = 0; j < LQ_SIZE; j++)
1786 for (i = 0; i < IWL_RATE_COUNT; i++)
1787 rs_rate_scale_clear_window(&(crl->lq_info[j].win[i]));
1788
1789 return crl;
1790}
1791
1792static void rs_rate_init(void *priv_rate, void *priv_sta,
1793 struct ieee80211_local *local,
1794 struct sta_info *sta)
1795{
1796 int i, j;
1797 struct ieee80211_hw_mode *mode = local->oper_hw_mode;
1798 struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
1799 struct iwl_rate_scale_priv *crl = priv_sta;
1800
b481de9c
ZY		 1801 crl->flush_timer = 0;
1802 sta->txrate = 3;
1803 for (j = 0; j < LQ_SIZE; j++)
1804 for (i = 0; i < IWL_RATE_COUNT; i++)
1805 rs_rate_scale_clear_window(&(crl->lq_info[j].win[i]));
1806
1807 IWL_DEBUG_RATE("rate scale global init\n");
1808 /* TODO: what is a good starting rate for STA? About middle? Maybe not
1809 * the lowest or the highest rate.. Could consider using RSSI from
1810 * previous packets? Need to have IEEE 802.1X auth succeed immediately
1811 * after assoc.. */
1812
1813 crl->ibss_sta_added = 0;
1814 if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
1815 u8 sta_id = iwl_hw_find_station(priv, sta->addr);
0795af57
JP		 1816 DECLARE_MAC_BUF(mac);
1817
b481de9c 1818 /* for IBSS the call are from tasklet */
0795af57
JP		 1819 IWL_DEBUG_HT("LQ: ADD station %s\n",
1820 print_mac(mac, sta->addr));
b481de9c
ZY		 1821
1822 if (sta_id == IWL_INVALID_STATION) {
0795af57
JP		 1823 IWL_DEBUG_RATE("LQ: ADD station %s\n",
1824 print_mac(mac, sta->addr));
1825 sta_id = iwl_add_station(priv,
b481de9c
ZY		 1826 sta->addr, 0, CMD_ASYNC);
1827 }
1828 if ((sta_id != IWL_INVALID_STATION)) {
1829 crl->lq.sta_id = sta_id;
1830 crl->lq.rs_table[0].rate_n_flags = 0;
1831 }
1832 /* FIXME: this is w/a remove it later */
1833 priv->assoc_station_added = 1;
1834 }
1835
1836 for (i = 0; i < mode->num_rates; i++) {
1837 if ((sta->supp_rates & BIT(i)) &&
1838 (mode->rates[i].flags & IEEE80211_RATE_SUPPORTED))
1839 sta->txrate = i;
1840 }
1841 sta->last_txrate = sta->txrate;
1842 /* For MODE_IEEE80211A mode cck rate are at end
1843 * rate table
1844 */
1845 if (local->hw.conf.phymode == MODE_IEEE80211A)
1846 sta->last_txrate += IWL_FIRST_OFDM_RATE;
1847
1848 crl->is_dup = priv->is_dup;
1849 crl->valid_antenna = priv->valid_antenna;
1850 crl->antenna = priv->antenna;
1851 crl->is_green = rs_use_green(priv);
1852 crl->active_rate = priv->active_rate;
1853 crl->active_rate &= ~(0x1000);
1854 crl->active_rate_basic = priv->active_rate_basic;
1855 crl->phymode = priv->phymode;
1856#ifdef CONFIG_IWLWIFI_HT
1857 crl->active_siso_rate = (priv->current_assoc_ht.supp_rates[0] << 1);
1858 crl->active_siso_rate |= (priv->current_assoc_ht.supp_rates[0] & 0x1);
1859 crl->active_siso_rate &= ~((u16)0x2);
1860 crl->active_siso_rate = crl->active_siso_rate << IWL_FIRST_OFDM_RATE;
1861
1862 crl->active_mimo_rate = (priv->current_assoc_ht.supp_rates[1] << 1);
1863 crl->active_mimo_rate |= (priv->current_assoc_ht.supp_rates[1] & 0x1);
1864 crl->active_mimo_rate &= ~((u16)0x2);
1865 crl->active_mimo_rate = crl->active_mimo_rate << IWL_FIRST_OFDM_RATE;
1866 IWL_DEBUG_HT("MIMO RATE 0x%X SISO MASK 0x%X\n", crl->active_siso_rate,
1867 crl->active_mimo_rate);
1868#endif /*CONFIG_IWLWIFI_HT*/
1869
1870 if (priv->assoc_station_added)
1871 priv->lq_mngr.lq_ready = 1;
1872
1873 rs_initialize_lq(priv, sta);
1874}
1875
1876static int rs_fill_link_cmd(struct iwl_rate_scale_priv *lq_data,
1877 struct iwl_rate *tx_mcs,
1878 struct iwl_link_quality_cmd *lq_cmd,
1879 struct sta_info *sta)
1880{
1881 int index = 0;
1882 int rc = 0;
1883 int rate_idx;
1884 u8 ant_toggle_count = 0;
1885 u8 use_ht_possible = 1;
1886 u8 repeat_cur_rate = 0;
1887 struct iwl_rate new_rate;
1888 struct iwl_scale_tbl_info tbl_type = { 0 };
1889
1890 rs_get_tbl_info_from_mcs(tx_mcs, lq_data->phymode,
1891 &tbl_type, &rate_idx);
1892
1893 if (is_legacy(tbl_type.lq_type)) {
1894 ant_toggle_count = 1;
1895 repeat_cur_rate = IWL_NUMBER_TRY;
1896 } else
1897 repeat_cur_rate = IWL_HT_NUMBER_TRY;
1898
1899 lq_cmd->general_params.mimo_delimiter =
1900 is_mimo(tbl_type.lq_type) ? 1 : 0;
1901 lq_cmd->rs_table[index].rate_n_flags =
1902 cpu_to_le32(tx_mcs->rate_n_flags);
1903 new_rate.rate_n_flags = tx_mcs->rate_n_flags;
1904
1905 if (is_mimo(tbl_type.lq_type) || (tbl_type.antenna_type == ANT_MAIN))
1906 lq_cmd->general_params.single_stream_ant_msk = 1;
1907 else
1908 lq_cmd->general_params.single_stream_ant_msk = 2;
1909
1910 index++;
1911 repeat_cur_rate--;
1912
1913 while (index < LINK_QUAL_MAX_RETRY_NUM) {
1914 while (repeat_cur_rate && (index < LINK_QUAL_MAX_RETRY_NUM)) {
1915 if (is_legacy(tbl_type.lq_type)) {
1916 if (ant_toggle_count <
1917 NUM_TRY_BEFORE_ANTENNA_TOGGLE)
1918 ant_toggle_count++;
1919 else {
1920 rs_toggle_antenna(&new_rate, &tbl_type);
1921 ant_toggle_count = 1;
1922 }
1923 }
1924 lq_cmd->rs_table[index].rate_n_flags =
1925 cpu_to_le32(new_rate.rate_n_flags);
1926 repeat_cur_rate--;
1927 index++;
1928 }
1929
1930 rs_get_tbl_info_from_mcs(&new_rate, lq_data->phymode, &tbl_type,
1931 &rate_idx);
1932
1933 if (is_mimo(tbl_type.lq_type))
1934 lq_cmd->general_params.mimo_delimiter = index;
1935
1936 rs_get_lower_rate(lq_data, &tbl_type, rate_idx,
1937 use_ht_possible, &new_rate, sta);
1938
1939 if (is_legacy(tbl_type.lq_type)) {
1940 if (ant_toggle_count < NUM_TRY_BEFORE_ANTENNA_TOGGLE)
1941 ant_toggle_count++;
1942 else {
1943 rs_toggle_antenna(&new_rate, &tbl_type);
1944 ant_toggle_count = 1;
1945 }
1946 repeat_cur_rate = IWL_NUMBER_TRY;
1947 } else
1948 repeat_cur_rate = IWL_HT_NUMBER_TRY;
1949
1950 use_ht_possible = 0;
1951
1952 lq_cmd->rs_table[index].rate_n_flags =
1953 cpu_to_le32(new_rate.rate_n_flags);
1954 /* lq_cmd->rs_table[index].rate_n_flags = 0x800d; */
1955
1956 index++;
1957 repeat_cur_rate--;
1958 }
1959
1960 /* lq_cmd->rs_table[0].rate_n_flags = 0x800d; */
1961
1962 lq_cmd->general_params.dual_stream_ant_msk = 3;
1963 lq_cmd->agg_params.agg_dis_start_th = 3;
1964 lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
1965 return rc;
1966}
1967
1968static void *rs_alloc(struct ieee80211_local *local)
1969{
1970 return local->hw.priv;
1971}
1972/* rate scale requires free function to be implemented */
1973static void rs_free(void *priv_rate)
1974{
1975 return;
1976}
1977
1978static void rs_clear(void *priv_rate)
1979{
1980 struct iwl_priv *priv = (struct iwl_priv *) priv_rate;
1981
1982 IWL_DEBUG_RATE("enter\n");
1983
1984 priv->lq_mngr.lq_ready = 0;
1985#ifdef CONFIG_IWLWIFI_HT
1986#ifdef CONFIG_IWLWIFI_HT_AGG
1987 if (priv->lq_mngr.agg_ctrl.granted_ba)
1988 iwl4965_turn_off_agg(priv, TID_ALL_SPECIFIED);
1989#endif /*CONFIG_IWLWIFI_HT_AGG */
1990#endif /* CONFIG_IWLWIFI_HT */
1991
1992 IWL_DEBUG_RATE("leave\n");
1993}
1994
1995static void rs_free_sta(void *priv, void *priv_sta)
1996{
1997 struct iwl_rate_scale_priv *rs_priv = priv_sta;
1998
1999 IWL_DEBUG_RATE("enter\n");
2000 kfree(rs_priv);
2001 IWL_DEBUG_RATE("leave\n");
2002}
2003
2004
93dc646a 2005#ifdef CONFIG_MAC80211_DEBUGFS
5ae212c9
ZY		 2006static int open_file_generic(struct inode *inode, struct file *file)
2007{
2008 file->private_data = inode->i_private;
2009 return 0;
2010}
2011
2012static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2013 char __user *user_buf, size_t count, loff_t *ppos)
2014{
2015 char buff[1024];
2016 int desc = 0;
2017 int i = 0;
2018
2019 struct iwl_rate_scale_priv *rs_priv = file->private_data;
2020
2021 desc += sprintf(buff+desc, "sta_id %d\n", rs_priv->lq.sta_id);
2022 desc += sprintf(buff+desc, "failed=%d success=%d rate=%X\n",
2023 rs_priv->total_failed, rs_priv->total_success,
2024 rs_priv->active_rate);
2025 desc += sprintf(buff+desc, "general:"
2026 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2027 rs_priv->lq.general_params.flags,
2028 rs_priv->lq.general_params.mimo_delimiter,
2029 rs_priv->lq.general_params.single_stream_ant_msk,
2030 rs_priv->lq.general_params.dual_stream_ant_msk);
2031
2032 desc += sprintf(buff+desc, "agg:"
2033 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2034 le16_to_cpu(rs_priv->lq.agg_params.agg_time_limit),
2035 rs_priv->lq.agg_params.agg_dis_start_th,
2036 rs_priv->lq.agg_params.agg_frame_cnt_limit);
2037
2038 desc += sprintf(buff+desc,
2039 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2040 rs_priv->lq.general_params.start_rate_index[0],
2041 rs_priv->lq.general_params.start_rate_index[1],
2042 rs_priv->lq.general_params.start_rate_index[2],
2043 rs_priv->lq.general_params.start_rate_index[3]);
2044
2045
2046 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2047 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
2048 i, le32_to_cpu(rs_priv->lq.rs_table[i].rate_n_flags));
2049
2050 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2051}
2052
2053static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2054 .read = rs_sta_dbgfs_scale_table_read,
2055 .open = open_file_generic,
2056};
2057
93dc646a
ZY		 2058static void rs_add_debugfs(void *priv, void *priv_sta,
2059 struct dentry *dir)
2060{
5ae212c9
ZY		 2061 struct iwl_rate_scale_priv *rs_priv = priv_sta;
2062 rs_priv->rs_sta_dbgfs_scale_table_file =
2063 debugfs_create_file("rate_scale_table", 0444, dir,
2064 rs_priv, &rs_sta_dbgfs_scale_table_ops);
93dc646a
ZY		 2065}
2066
2067static void rs_remove_debugfs(void *priv, void *priv_sta)
2068{
5ae212c9
ZY		 2069 struct iwl_rate_scale_priv *rs_priv = priv_sta;
2070 debugfs_remove(rs_priv->rs_sta_dbgfs_scale_table_file);
93dc646a
ZY		 2071}
2072#endif
2073
b481de9c
ZY		 2074static struct rate_control_ops rs_ops = {
2075 .module = NULL,
2076 .name = RS_NAME,
2077 .tx_status = rs_tx_status,
2078 .get_rate = rs_get_rate,
2079 .rate_init = rs_rate_init,
2080 .clear = rs_clear,
2081 .alloc = rs_alloc,
2082 .free = rs_free,
2083 .alloc_sta = rs_alloc_sta,
2084 .free_sta = rs_free_sta,
93dc646a
ZY		 2085#ifdef CONFIG_MAC80211_DEBUGFS
2086 .add_sta_debugfs = rs_add_debugfs,
2087 .remove_sta_debugfs = rs_remove_debugfs,
2088#endif
b481de9c
ZY		 2089};
2090
2091int iwl_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id)
2092{
2093 struct ieee80211_local *local = hw_to_local(hw);
2094 struct iwl_priv *priv = hw->priv;
2095 struct iwl_rate_scale_priv *rs_priv;
2096 struct sta_info *sta;
2097 int count = 0, i;
2098 u32 samples = 0, success = 0, good = 0;
2099 unsigned long now = jiffies;
2100 u32 max_time = 0;
2101 u8 lq_type, antenna;
2102
2103 sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
2104 if (!sta || !sta->rate_ctrl_priv) {
2105 if (sta) {
2106 sta_info_put(sta);
2107 IWL_DEBUG_RATE("leave - no private rate data!\n");
2108 } else
2109 IWL_DEBUG_RATE("leave - no station!\n");
2110 return sprintf(buf, "station %d not found\n", sta_id);
2111 }
2112
2113 rs_priv = (void *)sta->rate_ctrl_priv;
2114
2115 lq_type = rs_priv->lq_info[rs_priv->active_tbl].lq_type;
2116 antenna = rs_priv->lq_info[rs_priv->active_tbl].antenna_type;
2117
2118 if (is_legacy(lq_type))
2119 i = IWL_RATE_54M_INDEX;
2120 else
2121 i = IWL_RATE_60M_INDEX;
2122 while (1) {
2123 u64 mask;
2124 int j;
2125 int active = rs_priv->active_tbl;
2126
2127 count +=
2128 sprintf(&buf[count], " %2dMbs: ", iwl_rates[i].ieee / 2);
2129
2130 mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1));
2131 for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1)
2132 buf[count++] =
2133 (rs_priv->lq_info[active].win[i].data & mask)
2134 ? '1' : '0';
2135
2136 samples += rs_priv->lq_info[active].win[i].counter;
2137 good += rs_priv->lq_info[active].win[i].success_counter;
2138 success += rs_priv->lq_info[active].win[i].success_counter *
2139 iwl_rates[i].ieee;
2140
2141 if (rs_priv->lq_info[active].win[i].stamp) {
2142 int delta =
2143 jiffies_to_msecs(now -
2144 rs_priv->lq_info[active].win[i].stamp);
2145
2146 if (delta > max_time)
2147 max_time = delta;
2148
2149 count += sprintf(&buf[count], "%5dms\n", delta);
2150 } else
2151 buf[count++] = '\n';
2152
2153 j = iwl_get_prev_ieee_rate(i);
2154 if (j == i)
2155 break;
2156 i = j;
2157 }
2158
2159 /* Display the average rate of all samples taken.
2160 *
2161 * NOTE: We multiple # of samples by 2 since the IEEE measurement
2162 * added from iwl_rates is actually 2X the rate */
2163 if (samples)
2164 count += sprintf(&buf[count],
2165 "\nAverage rate is %3d.%02dMbs over last %4dms\n"
2166 "%3d%% success (%d good packets over %d tries)\n",
2167 success / (2 * samples), (success * 5 / samples) % 10,
2168 max_time, good * 100 / samples, good, samples);
2169 else
2170 count += sprintf(&buf[count], "\nAverage rate: 0Mbs\n");
2171 count += sprintf(&buf[count], "\nrate scale type %d anntena %d "
2172 "active_search %d rate index %d\n", lq_type, antenna,
2173 rs_priv->search_better_tbl, sta->last_txrate);
2174
2175 sta_info_put(sta);
2176 return count;
2177}
2178
2179void iwl_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
2180{
2181 struct iwl_priv *priv = hw->priv;
2182
2183 priv->lq_mngr.lq_ready = 1;
2184}
2185
2186void iwl_rate_control_register(struct ieee80211_hw *hw)
2187{
2188 ieee80211_rate_control_register(&rs_ops);
2189}
2190
2191void iwl_rate_control_unregister(struct ieee80211_hw *hw)
2192{
2193 ieee80211_rate_control_unregister(&rs_ops);
2194}
2195
Linux kernel - Deliverables
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