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pcmcia: CompactFlash driver for PA Semi Electra boards
[pv_ops_mirror.git] / drivers / net / wireless / iwlwifi / iwl-4965-rs.c
blob287c75705c44db0a72729dad2f0833294e5ac1ff
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
42 #define IWL 4965
43
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
63 static 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
73 struct iwl_rate {
74 u32 rate_n_flags;
75 } __attribute__ ((packed));
76
77 struct 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
86 struct 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
98 struct 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 u32 supp_rates;
119 u16 active_rate;
120 u16 active_siso_rate;
121 u16 active_mimo_rate;
122 u16 active_rate_basic;
123 struct iwl_link_quality_cmd lq;
124 struct iwl_scale_tbl_info lq_info[LQ_SIZE];
125 #ifdef CONFIG_MAC80211_DEBUGFS
126 struct dentry *rs_sta_dbgfs_scale_table_file;
127 struct dentry *rs_sta_dbgfs_stats_table_file;
128 struct iwl_rate dbg_fixed;
129 struct iwl_priv *drv;
130 #endif
131 };
132
133 static void rs_rate_scale_perform(struct iwl_priv *priv,
134 struct net_device *dev,
135 struct ieee80211_hdr *hdr,
136 struct sta_info *sta);
137 static void rs_fill_link_cmd(struct iwl_rate_scale_priv *lq_data,
138 struct iwl_rate *tx_mcs,
139 struct iwl_link_quality_cmd *tbl);
140
141
142 #ifdef CONFIG_MAC80211_DEBUGFS
143 static void rs_dbgfs_set_mcs(struct iwl_rate_scale_priv *rs_priv,
144 struct iwl_rate *mcs, int index);
145 #else
146 static void rs_dbgfs_set_mcs(struct iwl_rate_scale_priv *rs_priv,
147 struct iwl_rate *mcs, int index)
148 {}
149 #endif
150 static s32 expected_tpt_A[IWL_RATE_COUNT] = {
151 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
152 };
153
154 static s32 expected_tpt_G[IWL_RATE_COUNT] = {
155 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
156 };
157
158 static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
159 0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
160 };
161
162 static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
163 0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
164 };
165
166 static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
167 0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
168 };
169
170 static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
171 0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
172 };
173
174 static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
175 0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
176 };
177
178 static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
179 0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
180 };
181
182 static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
183 0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
184 };
185
186 static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
187 0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
188 };
189
190 static int iwl_lq_sync_callback(struct iwl_priv *priv,
191 struct iwl_cmd *cmd, struct sk_buff *skb)
192 {
193 /*We didn't cache the SKB; let the caller free it */
194 return 1;
195 }
196
197 static inline u8 iwl_rate_get_rate(u32 rate_n_flags)
198 {
199 return (u8)(rate_n_flags & 0xFF);
200 }
201
202 static int rs_send_lq_cmd(struct iwl_priv *priv,
203 struct iwl_link_quality_cmd *lq, u8 flags)
204 {
205 #ifdef CONFIG_IWLWIFI_DEBUG
206 int i;
207 #endif
208 int rc = -1;
209
210 struct iwl_host_cmd cmd = {
211 .id = REPLY_TX_LINK_QUALITY_CMD,
212 .len = sizeof(struct iwl_link_quality_cmd),
213 .meta.flags = flags,
214 .data = lq,
215 };
216
217 if ((lq->sta_id == 0xFF) &&
218 (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
219 return rc;
220
221 if (lq->sta_id == 0xFF)
222 lq->sta_id = IWL_AP_ID;
223
224 IWL_DEBUG_RATE("lq station id 0x%x\n", lq->sta_id);
225 IWL_DEBUG_RATE("lq dta 0x%X 0x%X\n",
226 lq->general_params.single_stream_ant_msk,
227 lq->general_params.dual_stream_ant_msk);
228 #ifdef CONFIG_IWLWIFI_DEBUG
229 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
230 IWL_DEBUG_RATE("lq index %d 0x%X\n",
231 i, lq->rs_table[i].rate_n_flags);
232 #endif
233
234 if (flags & CMD_ASYNC)
235 cmd.meta.u.callback = iwl_lq_sync_callback;
236
237 if (iwl_is_associated(priv) && priv->assoc_station_added &&
238 priv->lq_mngr.lq_ready)
239 rc = iwl_send_cmd(priv, &cmd);
240
241 return rc;
242 }
243
244 static int rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
245 {
246 window->data = 0;
247 window->success_counter = 0;
248 window->success_ratio = IWL_INVALID_VALUE;
249 window->counter = 0;
250 window->average_tpt = IWL_INVALID_VALUE;
251 window->stamp = 0;
252
253 return 0;
254 }
255
256 static int rs_collect_tx_data(struct iwl_rate_scale_data *windows,
257 int scale_index, s32 tpt, u32 status)
258 {
259 int rc = 0;
260 struct iwl_rate_scale_data *window = NULL;
261 u64 mask;
262 u8 win_size = IWL_RATE_MAX_WINDOW;
263 s32 fail_count;
264
265 if (scale_index < 0)
266 return -1;
267
268 if (scale_index >= IWL_RATE_COUNT)
269 return -1;
270
271 window = &(windows[scale_index]);
272
273 if (window->counter >= win_size) {
274
275 window->counter = win_size - 1;
276 mask = 1;
277 mask = (mask << (win_size - 1));
278 if ((window->data & mask)) {
279 window->data &= ~mask;
280 window->success_counter = window->success_counter - 1;
281 }
282 }
283
284 window->counter = window->counter + 1;
285 mask = window->data;
286 window->data = (mask << 1);
287 if (status != 0) {
288 window->success_counter = window->success_counter + 1;
289 window->data |= 0x1;
290 }
291
292 if (window->counter > 0)
293 window->success_ratio = 128 * (100 * window->success_counter)
294 / window->counter;
295 else
296 window->success_ratio = IWL_INVALID_VALUE;
297
298 fail_count = window->counter - window->success_counter;
299
300 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
301 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
302 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
303 else
304 window->average_tpt = IWL_INVALID_VALUE;
305
306 window->stamp = jiffies;
307
308 return rc;
309 }
310
311 int static rs_mcs_from_tbl(struct iwl_rate *mcs_rate,
312 struct iwl_scale_tbl_info *tbl,
313 int index, u8 use_green)
314 {
315 int rc = 0;
316
317 if (is_legacy(tbl->lq_type)) {
318 mcs_rate->rate_n_flags = iwl_rates[index].plcp;
319 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
320 mcs_rate->rate_n_flags |= RATE_MCS_CCK_MSK;
321
322 } else if (is_siso(tbl->lq_type)) {
323 if (index > IWL_LAST_OFDM_RATE)
324 index = IWL_LAST_OFDM_RATE;
325 mcs_rate->rate_n_flags = iwl_rates[index].plcp_siso |
326 RATE_MCS_HT_MSK;
327 } else {
328 if (index > IWL_LAST_OFDM_RATE)
329 index = IWL_LAST_OFDM_RATE;
330 mcs_rate->rate_n_flags = iwl_rates[index].plcp_mimo |
331 RATE_MCS_HT_MSK;
332 }
333
334 switch (tbl->antenna_type) {
335 case ANT_BOTH:
336 mcs_rate->rate_n_flags |= RATE_MCS_ANT_AB_MSK;
337 break;
338 case ANT_MAIN:
339 mcs_rate->rate_n_flags |= RATE_MCS_ANT_A_MSK;
340 break;
341 case ANT_AUX:
342 mcs_rate->rate_n_flags |= RATE_MCS_ANT_B_MSK;
343 break;
344 case ANT_NONE:
345 break;
346 }
347
348 if (is_legacy(tbl->lq_type))
349 return rc;
350
351 if (tbl->is_fat) {
352 if (tbl->is_dup)
353 mcs_rate->rate_n_flags |= RATE_MCS_DUP_MSK;
354 else
355 mcs_rate->rate_n_flags |= RATE_MCS_FAT_MSK;
356 }
357 if (tbl->is_SGI)
358 mcs_rate->rate_n_flags |= RATE_MCS_SGI_MSK;
359
360 if (use_green) {
361 mcs_rate->rate_n_flags |= RATE_MCS_GF_MSK;
362 if (is_siso(tbl->lq_type))
363 mcs_rate->rate_n_flags &= ~RATE_MCS_SGI_MSK;
364 }
365 return rc;
366 }
367
368 static int rs_get_tbl_info_from_mcs(const struct iwl_rate *mcs_rate,
369 int phymode, struct iwl_scale_tbl_info *tbl,
370 int *rate_idx)
371 {
372 int index;
373 u32 ant_msk;
374
375 index = iwl_rate_index_from_plcp(mcs_rate->rate_n_flags);
376
377 if (index == IWL_RATE_INVALID) {
378 *rate_idx = -1;
379 return -1;
380 }
381 tbl->is_SGI = 0;
382 tbl->is_fat = 0;
383 tbl->is_dup = 0;
384 tbl->antenna_type = ANT_BOTH;
385
386 if (!(mcs_rate->rate_n_flags & RATE_MCS_HT_MSK)) {
387 ant_msk = (mcs_rate->rate_n_flags & RATE_MCS_ANT_AB_MSK);
388
389 if (ant_msk == RATE_MCS_ANT_AB_MSK)
390 tbl->lq_type = LQ_NONE;
391 else {
392
393 if (phymode == MODE_IEEE80211A)
394 tbl->lq_type = LQ_A;
395 else
396 tbl->lq_type = LQ_G;
397
398 if (mcs_rate->rate_n_flags & RATE_MCS_ANT_A_MSK)
399 tbl->antenna_type = ANT_MAIN;
400 else
401 tbl->antenna_type = ANT_AUX;
402 }
403 *rate_idx = index;
404
405 } else if (iwl_rate_get_rate(mcs_rate->rate_n_flags)
406 <= IWL_RATE_SISO_60M_PLCP) {
407 tbl->lq_type = LQ_SISO;
408
409 ant_msk = (mcs_rate->rate_n_flags & RATE_MCS_ANT_AB_MSK);
410 if (ant_msk == RATE_MCS_ANT_AB_MSK)
411 tbl->lq_type = LQ_NONE;
412 else {
413 if (mcs_rate->rate_n_flags & RATE_MCS_ANT_A_MSK)
414 tbl->antenna_type = ANT_MAIN;
415 else
416 tbl->antenna_type = ANT_AUX;
417 }
418 if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK)
419 tbl->is_SGI = 1;
420
421 if ((mcs_rate->rate_n_flags & RATE_MCS_FAT_MSK) ||
422 (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK))
423 tbl->is_fat = 1;
424
425 if (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK)
426 tbl->is_dup = 1;
427
428 *rate_idx = index;
429 } else {
430 tbl->lq_type = LQ_MIMO;
431 if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK)
432 tbl->is_SGI = 1;
433
434 if ((mcs_rate->rate_n_flags & RATE_MCS_FAT_MSK) ||
435 (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK))
436 tbl->is_fat = 1;
437
438 if (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK)
439 tbl->is_dup = 1;
440 *rate_idx = index;
441 }
442 return 0;
443 }
444
445 static inline void rs_toggle_antenna(struct iwl_rate *new_rate,
446 struct iwl_scale_tbl_info *tbl)
447 {
448 if (tbl->antenna_type == ANT_AUX) {
449 tbl->antenna_type = ANT_MAIN;
450 new_rate->rate_n_flags &= ~RATE_MCS_ANT_B_MSK;
451 new_rate->rate_n_flags |= RATE_MCS_ANT_A_MSK;
452 } else {
453 tbl->antenna_type = ANT_AUX;
454 new_rate->rate_n_flags &= ~RATE_MCS_ANT_A_MSK;
455 new_rate->rate_n_flags |= RATE_MCS_ANT_B_MSK;
456 }
457 }
458
459 static inline s8 rs_use_green(struct iwl_priv *priv)
460 {
461 s8 rc = 0;
462 #ifdef CONFIG_IWLWIFI_HT
463 if (!priv->is_ht_enabled || !priv->current_assoc_ht.is_ht)
464 return 0;
465
466 if ((priv->current_assoc_ht.is_green_field) &&
467 !(priv->current_assoc_ht.operating_mode & 0x4))
468 rc = 1;
469 #endif /*CONFIG_IWLWIFI_HT */
470 return rc;
471 }
472
473 /**
474 * rs_get_supported_rates - get the available rates
475 *
476 * if management frame or broadcast frame only return
477 * basic available rates.
478 *
479 */
480 static void rs_get_supported_rates(struct iwl_rate_scale_priv *lq_data,
481 struct ieee80211_hdr *hdr,
482 enum iwl_table_type rate_type,
483 u16 *data_rate)
484 {
485 if (is_legacy(rate_type))
486 *data_rate = lq_data->active_rate;
487 else {
488 if (is_siso(rate_type))
489 *data_rate = lq_data->active_siso_rate;
490 else
491 *data_rate = lq_data->active_mimo_rate;
492 }
493
494 if (hdr && is_multicast_ether_addr(hdr->addr1) &&
495 lq_data->active_rate_basic)
496 *data_rate = lq_data->active_rate_basic;
497 }
498
499 static u16 rs_get_adjacent_rate(u8 index, u16 rate_mask, int rate_type)
500 {
501 u8 high = IWL_RATE_INVALID;
502 u8 low = IWL_RATE_INVALID;
503
504 /* 802.11A or ht walks to the next literal adjascent rate in
505 * the rate table */
506 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
507 int i;
508 u32 mask;
509
510 /* Find the previous rate that is in the rate mask */
511 i = index - 1;
512 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
513 if (rate_mask & mask) {
514 low = i;
515 break;
516 }
517 }
518
519 /* Find the next rate that is in the rate mask */
520 i = index + 1;
521 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
522 if (rate_mask & mask) {
523 high = i;
524 break;
525 }
526 }
527
528 return (high << 8) | low;
529 }
530
531 low = index;
532 while (low != IWL_RATE_INVALID) {
533 low = iwl_rates[low].prev_rs;
534 if (low == IWL_RATE_INVALID)
535 break;
536 if (rate_mask & (1 << low))
537 break;
538 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
539 }
540
541 high = index;
542 while (high != IWL_RATE_INVALID) {
543 high = iwl_rates[high].next_rs;
544 if (high == IWL_RATE_INVALID)
545 break;
546 if (rate_mask & (1 << high))
547 break;
548 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
549 }
550
551 return (high << 8) | low;
552 }
553
554 static int rs_get_lower_rate(struct iwl_rate_scale_priv *lq_data,
555 struct iwl_scale_tbl_info *tbl, u8 scale_index,
556 u8 ht_possible, struct iwl_rate *mcs_rate)
557 {
558 s32 low;
559 u16 rate_mask;
560 u16 high_low;
561 u8 switch_to_legacy = 0;
562 u8 is_green = lq_data->is_green;
563
564 /* check if we need to switch from HT to legacy rates.
565 * assumption is that mandatory rates (1Mbps or 6Mbps)
566 * are always supported (spec demand) */
567 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
568 switch_to_legacy = 1;
569 scale_index = rs_ht_to_legacy[scale_index];
570 if (lq_data->phymode == MODE_IEEE80211A)
571 tbl->lq_type = LQ_A;
572 else
573 tbl->lq_type = LQ_G;
574
575 if ((tbl->antenna_type == ANT_BOTH) ||
576 (tbl->antenna_type == ANT_NONE))
577 tbl->antenna_type = ANT_MAIN;
578
579 tbl->is_fat = 0;
580 tbl->is_SGI = 0;
581 }
582
583 rs_get_supported_rates(lq_data, NULL, tbl->lq_type, &rate_mask);
584
585 /* mask with station rate restriction */
586 if (is_legacy(tbl->lq_type)) {
587 if (lq_data->phymode == (u8) MODE_IEEE80211A)
588 rate_mask = (u16)(rate_mask &
589 (lq_data->supp_rates << IWL_FIRST_OFDM_RATE));
590 else
591 rate_mask = (u16)(rate_mask & lq_data->supp_rates);
592 }
593
594 /* if we did switched from HT to legacy check current rate */
595 if ((switch_to_legacy) &&
596 (rate_mask & (1 << scale_index))) {
597 rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green);
598 return 0;
599 }
600
601 high_low = rs_get_adjacent_rate(scale_index, rate_mask, tbl->lq_type);
602 low = high_low & 0xff;
603
604 if (low != IWL_RATE_INVALID)
605 rs_mcs_from_tbl(mcs_rate, tbl, low, is_green);
606 else
607 rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green);
608
609 return 0;
610 }
611
612 static void rs_tx_status(void *priv_rate,
613 struct net_device *dev,
614 struct sk_buff *skb,
615 struct ieee80211_tx_status *tx_resp)
616 {
617 int status;
618 u8 retries;
619 int rs_index, index = 0;
620 struct iwl_rate_scale_priv *lq;
621 struct iwl_link_quality_cmd *table;
622 struct sta_info *sta;
623 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
624 struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
625 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
626 struct iwl_rate_scale_data *window = NULL;
627 struct iwl_rate_scale_data *search_win = NULL;
628 struct iwl_rate tx_mcs;
629 struct iwl_scale_tbl_info tbl_type;
630 struct iwl_scale_tbl_info *curr_tbl, *search_tbl;
631 u8 active_index = 0;
632 u16 fc = le16_to_cpu(hdr->frame_control);
633 s32 tpt = 0;
634
635 IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
636
637 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1))
638 return;
639
640 retries = tx_resp->retry_count;
641
642 if (retries > 15)
643 retries = 15;
644
645
646 sta = sta_info_get(local, hdr->addr1);
647
648 if (!sta || !sta->rate_ctrl_priv) {
649 if (sta)
650 sta_info_put(sta);
651 return;
652 }
653
654 lq = (struct iwl_rate_scale_priv *)sta->rate_ctrl_priv;
655
656 if (!priv->lq_mngr.lq_ready)
657 return;
658
659 if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) && !lq->ibss_sta_added)
660 return;
661
662 table = &lq->lq;
663 active_index = lq->active_tbl;
664
665 lq->antenna = (lq->valid_antenna & local->hw.conf.antenna_sel_tx);
666 if (!lq->antenna)
667 lq->antenna = lq->valid_antenna;
668
669 lq->antenna = lq->valid_antenna;
670 curr_tbl = &(lq->lq_info[active_index]);
671 search_tbl = &(lq->lq_info[(1 - active_index)]);
672 window = (struct iwl_rate_scale_data *)
673 &(curr_tbl->win[0]);
674 search_win = (struct iwl_rate_scale_data *)
675 &(search_tbl->win[0]);
676
677 tx_mcs.rate_n_flags = tx_resp->control.tx_rate;
678
679 rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode,
680 &tbl_type, &rs_index);
681 if ((rs_index < 0) || (rs_index >= IWL_RATE_COUNT)) {
682 IWL_DEBUG_RATE("bad rate index at: %d rate 0x%X\n",
683 rs_index, tx_mcs.rate_n_flags);
684 sta_info_put(sta);
685 return;
686 }
687
688 if (retries &&
689 (tx_mcs.rate_n_flags !=
690 le32_to_cpu(table->rs_table[0].rate_n_flags))) {
691 IWL_DEBUG_RATE("initial rate does not match 0x%x 0x%x\n",
692 tx_mcs.rate_n_flags,
693 le32_to_cpu(table->rs_table[0].rate_n_flags));
694 sta_info_put(sta);
695 return;
696 }
697
698 while (retries) {
699 tx_mcs.rate_n_flags =
700 le32_to_cpu(table->rs_table[index].rate_n_flags);
701 rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode,
702 &tbl_type, &rs_index);
703
704 if ((tbl_type.lq_type == search_tbl->lq_type) &&
705 (tbl_type.antenna_type == search_tbl->antenna_type) &&
706 (tbl_type.is_SGI == search_tbl->is_SGI)) {
707 if (search_tbl->expected_tpt)
708 tpt = search_tbl->expected_tpt[rs_index];
709 else
710 tpt = 0;
711 rs_collect_tx_data(search_win,
712 rs_index, tpt, 0);
713 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
714 (tbl_type.antenna_type == curr_tbl->antenna_type) &&
715 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
716 if (curr_tbl->expected_tpt)
717 tpt = curr_tbl->expected_tpt[rs_index];
718 else
719 tpt = 0;
720 rs_collect_tx_data(window, rs_index, tpt, 0);
721 }
722 if (lq->stay_in_tbl)
723 lq->total_failed++;
724 --retries;
725 index++;
726
727 }
728
729 if (!tx_resp->retry_count)
730 tx_mcs.rate_n_flags = tx_resp->control.tx_rate;
731 else
732 tx_mcs.rate_n_flags =
733 le32_to_cpu(table->rs_table[index].rate_n_flags);
734
735 rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode,
736 &tbl_type, &rs_index);
737
738 if (tx_resp->flags & IEEE80211_TX_STATUS_ACK)
739 status = 1;
740 else
741 status = 0;
742
743 if ((tbl_type.lq_type == search_tbl->lq_type) &&
744 (tbl_type.antenna_type == search_tbl->antenna_type) &&
745 (tbl_type.is_SGI == search_tbl->is_SGI)) {
746 if (search_tbl->expected_tpt)
747 tpt = search_tbl->expected_tpt[rs_index];
748 else
749 tpt = 0;
750 rs_collect_tx_data(search_win,
751 rs_index, tpt, status);
752 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
753 (tbl_type.antenna_type == curr_tbl->antenna_type) &&
754 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
755 if (curr_tbl->expected_tpt)
756 tpt = curr_tbl->expected_tpt[rs_index];
757 else
758 tpt = 0;
759 rs_collect_tx_data(window, rs_index, tpt, status);
760 }
761
762 if (lq->stay_in_tbl) {
763 if (status)
764 lq->total_success++;
765 else
766 lq->total_failed++;
767 }
768
769 rs_rate_scale_perform(priv, dev, hdr, sta);
770 sta_info_put(sta);
771 return;
772 }
773
774 static u8 rs_is_ant_connected(u8 valid_antenna,
775 enum iwl_antenna_type antenna_type)
776 {
777 if (antenna_type == ANT_AUX)
778 return ((valid_antenna & 0x2) ? 1:0);
779 else if (antenna_type == ANT_MAIN)
780 return ((valid_antenna & 0x1) ? 1:0);
781 else if (antenna_type == ANT_BOTH) {
782 if ((valid_antenna & 0x3) == 0x3)
783 return 1;
784 else
785 return 0;
786 }
787
788 return 1;
789 }
790
791 static u8 rs_is_other_ant_connected(u8 valid_antenna,
792 enum iwl_antenna_type antenna_type)
793 {
794 if (antenna_type == ANT_AUX)
795 return (rs_is_ant_connected(valid_antenna, ANT_MAIN));
796 else
797 return (rs_is_ant_connected(valid_antenna, ANT_AUX));
798
799 return 0;
800 }
801
802 static void rs_set_stay_in_table(u8 is_legacy,
803 struct iwl_rate_scale_priv *lq_data)
804 {
805 IWL_DEBUG_HT("we are staying in the same table\n");
806 lq_data->stay_in_tbl = 1;
807 if (is_legacy) {
808 lq_data->table_count_limit = IWL_LEGACY_TABLE_COUNT;
809 lq_data->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
810 lq_data->max_success_limit = IWL_LEGACY_TABLE_COUNT;
811 } else {
812 lq_data->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
813 lq_data->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
814 lq_data->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
815 }
816 lq_data->table_count = 0;
817 lq_data->total_failed = 0;
818 lq_data->total_success = 0;
819 }
820
821 static void rs_get_expected_tpt_table(struct iwl_rate_scale_priv *lq_data,
822 struct iwl_scale_tbl_info *tbl)
823 {
824 if (is_legacy(tbl->lq_type)) {
825 if (!is_a_band(tbl->lq_type))
826 tbl->expected_tpt = expected_tpt_G;
827 else
828 tbl->expected_tpt = expected_tpt_A;
829 } else if (is_siso(tbl->lq_type)) {
830 if (tbl->is_fat && !lq_data->is_dup)
831 if (tbl->is_SGI)
832 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
833 else
834 tbl->expected_tpt = expected_tpt_siso40MHz;
835 else if (tbl->is_SGI)
836 tbl->expected_tpt = expected_tpt_siso20MHzSGI;
837 else
838 tbl->expected_tpt = expected_tpt_siso20MHz;
839
840 } else if (is_mimo(tbl->lq_type)) {
841 if (tbl->is_fat && !lq_data->is_dup)
842 if (tbl->is_SGI)
843 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
844 else
845 tbl->expected_tpt = expected_tpt_mimo40MHz;
846 else if (tbl->is_SGI)
847 tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
848 else
849 tbl->expected_tpt = expected_tpt_mimo20MHz;
850 } else
851 tbl->expected_tpt = expected_tpt_G;
852 }
853
854 #ifdef CONFIG_IWLWIFI_HT
855 static s32 rs_get_best_rate(struct iwl_priv *priv,
856 struct iwl_rate_scale_priv *lq_data,
857 struct iwl_scale_tbl_info *tbl,
858 u16 rate_mask, s8 index, s8 rate)
859 {
860 struct iwl_scale_tbl_info *active_tbl =
861 &(lq_data->lq_info[lq_data->active_tbl]);
862 s32 new_rate, high, low, start_hi;
863 s32 active_sr = active_tbl->win[index].success_ratio;
864 s32 *tpt_tbl = tbl->expected_tpt;
865 s32 active_tpt = active_tbl->expected_tpt[index];
866 u16 high_low;
867
868 new_rate = high = low = start_hi = IWL_RATE_INVALID;
869
870 for (; ;) {
871 high_low = rs_get_adjacent_rate(rate, rate_mask, tbl->lq_type);
872
873 low = high_low & 0xff;
874 high = (high_low >> 8) & 0xff;
875
876 if ((((100 * tpt_tbl[rate]) > lq_data->last_tpt) &&
877 ((active_sr > IWL_RATE_DECREASE_TH) &&
878 (active_sr <= IWL_RATE_HIGH_TH) &&
879 (tpt_tbl[rate] <= active_tpt))) ||
880 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
881 (tpt_tbl[rate] > active_tpt))) {
882
883 if (start_hi != IWL_RATE_INVALID) {
884 new_rate = start_hi;
885 break;
886 }
887 new_rate = rate;
888 if (low != IWL_RATE_INVALID)
889 rate = low;
890 else
891 break;
892 } else {
893 if (new_rate != IWL_RATE_INVALID)
894 break;
895 else if (high != IWL_RATE_INVALID) {
896 start_hi = high;
897 rate = high;
898 } else {
899 new_rate = rate;
900 break;
901 }
902 }
903 }
904
905 return new_rate;
906 }
907 #endif /* CONFIG_IWLWIFI_HT */
908
909 static inline u8 rs_is_both_ant_supp(u8 valid_antenna)
910 {
911 return (rs_is_ant_connected(valid_antenna, ANT_BOTH));
912 }
913
914 static int rs_switch_to_mimo(struct iwl_priv *priv,
915 struct iwl_rate_scale_priv *lq_data,
916 struct iwl_scale_tbl_info *tbl, int index)
917 {
918 int rc = -1;
919 #ifdef CONFIG_IWLWIFI_HT
920 u16 rate_mask;
921 s32 rate;
922 s8 is_green = lq_data->is_green;
923
924 if (!priv->is_ht_enabled || !priv->current_assoc_ht.is_ht)
925 return -1;
926
927 IWL_DEBUG_HT("LQ: try to switch to MIMO\n");
928 tbl->lq_type = LQ_MIMO;
929 rs_get_supported_rates(lq_data, NULL, tbl->lq_type,
930 &rate_mask);
931
932 if (priv->current_assoc_ht.tx_mimo_ps_mode == IWL_MIMO_PS_STATIC)
933 return -1;
934
935 if (!rs_is_both_ant_supp(lq_data->antenna))
936 return -1;
937
938 rc = 0;
939 tbl->is_dup = lq_data->is_dup;
940 tbl->action = 0;
941 if (priv->current_channel_width == IWL_CHANNEL_WIDTH_40MHZ)
942 tbl->is_fat = 1;
943 else
944 tbl->is_fat = 0;
945
946 if (tbl->is_fat) {
947 if (priv->current_assoc_ht.sgf & HT_SHORT_GI_40MHZ_ONLY)
948 tbl->is_SGI = 1;
949 else
950 tbl->is_SGI = 0;
951 } else if (priv->current_assoc_ht.sgf & HT_SHORT_GI_20MHZ_ONLY)
952 tbl->is_SGI = 1;
953 else
954 tbl->is_SGI = 0;
955
956 rs_get_expected_tpt_table(lq_data, tbl);
957
958 rate = rs_get_best_rate(priv, lq_data, tbl, rate_mask, index, index);
959
960 IWL_DEBUG_HT("LQ: MIMO best rate %d mask %X\n", rate, rate_mask);
961 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask))
962 return -1;
963 rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green);
964
965 IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
966 tbl->current_rate.rate_n_flags, is_green);
967
968 #endif /*CONFIG_IWLWIFI_HT */
969 return rc;
970 }
971
972 static int rs_switch_to_siso(struct iwl_priv *priv,
973 struct iwl_rate_scale_priv *lq_data,
974 struct iwl_scale_tbl_info *tbl, int index)
975 {
976 int rc = -1;
977 #ifdef CONFIG_IWLWIFI_HT
978 u16 rate_mask;
979 u8 is_green = lq_data->is_green;
980 s32 rate;
981
982 IWL_DEBUG_HT("LQ: try to switch to SISO\n");
983 if (!priv->is_ht_enabled || !priv->current_assoc_ht.is_ht)
984 return -1;
985
986 rc = 0;
987 tbl->is_dup = lq_data->is_dup;
988 tbl->lq_type = LQ_SISO;
989 tbl->action = 0;
990 rs_get_supported_rates(lq_data, NULL, tbl->lq_type,
991 &rate_mask);
992
993 if (priv->current_channel_width == IWL_CHANNEL_WIDTH_40MHZ)
994 tbl->is_fat = 1;
995 else
996 tbl->is_fat = 0;
997
998 if (tbl->is_fat) {
999 if (priv->current_assoc_ht.sgf & HT_SHORT_GI_40MHZ_ONLY)
1000 tbl->is_SGI = 1;
1001 else
1002 tbl->is_SGI = 0;
1003 } else if (priv->current_assoc_ht.sgf & HT_SHORT_GI_20MHZ_ONLY)
1004 tbl->is_SGI = 1;
1005 else
1006 tbl->is_SGI = 0;
1007
1008 if (is_green)
1009 tbl->is_SGI = 0;
1010
1011 rs_get_expected_tpt_table(lq_data, tbl);
1012 rate = rs_get_best_rate(priv, lq_data, tbl, rate_mask, index, index);
1013
1014 IWL_DEBUG_HT("LQ: get best rate %d mask %X\n", rate, rate_mask);
1015 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1016 IWL_DEBUG_HT("can not switch with index %d rate mask %x\n",
1017 rate, rate_mask);
1018 return -1;
1019 }
1020 rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green);
1021 IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
1022 tbl->current_rate.rate_n_flags, is_green);
1023
1024 #endif /*CONFIG_IWLWIFI_HT */
1025 return rc;
1026 }
1027
1028 static int rs_move_legacy_other(struct iwl_priv *priv,
1029 struct iwl_rate_scale_priv *lq_data,
1030 int index)
1031 {
1032 int rc = 0;
1033 struct iwl_scale_tbl_info *tbl =
1034 &(lq_data->lq_info[lq_data->active_tbl]);
1035 struct iwl_scale_tbl_info *search_tbl =
1036 &(lq_data->lq_info[(1 - lq_data->active_tbl)]);
1037 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1038 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1039 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1040 u8 start_action = tbl->action;
1041
1042 for (; ;) {
1043 switch (tbl->action) {
1044 case IWL_LEGACY_SWITCH_ANTENNA:
1045 IWL_DEBUG_HT("LQ Legacy switch Antenna\n");
1046
1047 search_tbl->lq_type = LQ_NONE;
1048 lq_data->action_counter++;
1049 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1050 break;
1051 if (!rs_is_other_ant_connected(lq_data->antenna,
1052 tbl->antenna_type))
1053 break;
1054
1055 memcpy(search_tbl, tbl, sz);
1056
1057 rs_toggle_antenna(&(search_tbl->current_rate),
1058 search_tbl);
1059 rs_get_expected_tpt_table(lq_data, search_tbl);
1060 lq_data->search_better_tbl = 1;
1061 goto out;
1062
1063 case IWL_LEGACY_SWITCH_SISO:
1064 IWL_DEBUG_HT("LQ: Legacy switch to SISO\n");
1065 memcpy(search_tbl, tbl, sz);
1066 search_tbl->lq_type = LQ_SISO;
1067 search_tbl->is_SGI = 0;
1068 search_tbl->is_fat = 0;
1069 rc = rs_switch_to_siso(priv, lq_data, search_tbl,
1070 index);
1071 if (!rc) {
1072 lq_data->search_better_tbl = 1;
1073 lq_data->action_counter = 0;
1074 }
1075 if (!rc)
1076 goto out;
1077
1078 break;
1079 case IWL_LEGACY_SWITCH_MIMO:
1080 IWL_DEBUG_HT("LQ: Legacy switch MIMO\n");
1081 memcpy(search_tbl, tbl, sz);
1082 search_tbl->lq_type = LQ_MIMO;
1083 search_tbl->is_SGI = 0;
1084 search_tbl->is_fat = 0;
1085 search_tbl->antenna_type = ANT_BOTH;
1086 rc = rs_switch_to_mimo(priv, lq_data, search_tbl,
1087 index);
1088 if (!rc) {
1089 lq_data->search_better_tbl = 1;
1090 lq_data->action_counter = 0;
1091 }
1092 if (!rc)
1093 goto out;
1094 break;
1095 }
1096 tbl->action++;
1097 if (tbl->action > IWL_LEGACY_SWITCH_MIMO)
1098 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1099
1100 if (tbl->action == start_action)
1101 break;
1102
1103 }
1104 return 0;
1105
1106 out:
1107 tbl->action++;
1108 if (tbl->action > IWL_LEGACY_SWITCH_MIMO)
1109 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1110 return 0;
1111
1112 }
1113
1114 static int rs_move_siso_to_other(struct iwl_priv *priv,
1115 struct iwl_rate_scale_priv *lq_data,
1116 int index)
1117 {
1118 int rc = -1;
1119 u8 is_green = lq_data->is_green;
1120 struct iwl_scale_tbl_info *tbl =
1121 &(lq_data->lq_info[lq_data->active_tbl]);
1122 struct iwl_scale_tbl_info *search_tbl =
1123 &(lq_data->lq_info[(1 - lq_data->active_tbl)]);
1124 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1125 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1126 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1127 u8 start_action = tbl->action;
1128
1129 for (;;) {
1130 lq_data->action_counter++;
1131 switch (tbl->action) {
1132 case IWL_SISO_SWITCH_ANTENNA:
1133 IWL_DEBUG_HT("LQ: SISO SWITCH ANTENNA SISO\n");
1134 search_tbl->lq_type = LQ_NONE;
1135 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1136 break;
1137 if (!rs_is_other_ant_connected(lq_data->antenna,
1138 tbl->antenna_type))
1139 break;
1140
1141 memcpy(search_tbl, tbl, sz);
1142 search_tbl->action = IWL_SISO_SWITCH_MIMO;
1143 rs_toggle_antenna(&(search_tbl->current_rate),
1144 search_tbl);
1145 lq_data->search_better_tbl = 1;
1146
1147 goto out;
1148
1149 case IWL_SISO_SWITCH_MIMO:
1150 IWL_DEBUG_HT("LQ: SISO SWITCH TO MIMO FROM SISO\n");
1151 memcpy(search_tbl, tbl, sz);
1152 search_tbl->lq_type = LQ_MIMO;
1153 search_tbl->is_SGI = 0;
1154 search_tbl->is_fat = 0;
1155 search_tbl->antenna_type = ANT_BOTH;
1156 rc = rs_switch_to_mimo(priv, lq_data, search_tbl,
1157 index);
1158 if (!rc)
1159 lq_data->search_better_tbl = 1;
1160
1161 if (!rc)
1162 goto out;
1163 break;
1164 case IWL_SISO_SWITCH_GI:
1165 IWL_DEBUG_HT("LQ: SISO SWITCH TO GI\n");
1166 memcpy(search_tbl, tbl, sz);
1167 search_tbl->action = 0;
1168 if (search_tbl->is_SGI)
1169 search_tbl->is_SGI = 0;
1170 else if (!is_green)
1171 search_tbl->is_SGI = 1;
1172 else
1173 break;
1174 lq_data->search_better_tbl = 1;
1175 if ((tbl->lq_type == LQ_SISO) &&
1176 (tbl->is_SGI)) {
1177 s32 tpt = lq_data->last_tpt / 100;
1178 if (((!tbl->is_fat) &&
1179 (tpt >= expected_tpt_siso20MHz[index])) ||
1180 ((tbl->is_fat) &&
1181 (tpt >= expected_tpt_siso40MHz[index])))
1182 lq_data->search_better_tbl = 0;
1183 }
1184 rs_get_expected_tpt_table(lq_data, search_tbl);
1185 rs_mcs_from_tbl(&search_tbl->current_rate,
1186 search_tbl, index, is_green);
1187 goto out;
1188 }
1189 tbl->action++;
1190 if (tbl->action > IWL_SISO_SWITCH_GI)
1191 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1192
1193 if (tbl->action == start_action)
1194 break;
1195 }
1196 return 0;
1197
1198 out:
1199 tbl->action++;
1200 if (tbl->action > IWL_SISO_SWITCH_GI)
1201 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1202 return 0;
1203 }
1204
1205 static int rs_move_mimo_to_other(struct iwl_priv *priv,
1206 struct iwl_rate_scale_priv *lq_data,
1207 int index)
1208 {
1209 int rc = -1;
1210 s8 is_green = lq_data->is_green;
1211 struct iwl_scale_tbl_info *tbl =
1212 &(lq_data->lq_info[lq_data->active_tbl]);
1213 struct iwl_scale_tbl_info *search_tbl =
1214 &(lq_data->lq_info[(1 - lq_data->active_tbl)]);
1215 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1216 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1217 u8 start_action = tbl->action;
1218
1219 for (;;) {
1220 lq_data->action_counter++;
1221 switch (tbl->action) {
1222 case IWL_MIMO_SWITCH_ANTENNA_A:
1223 case IWL_MIMO_SWITCH_ANTENNA_B:
1224 IWL_DEBUG_HT("LQ: MIMO SWITCH TO SISO\n");
1225 memcpy(search_tbl, tbl, sz);
1226 search_tbl->lq_type = LQ_SISO;
1227 search_tbl->is_SGI = 0;
1228 search_tbl->is_fat = 0;
1229 if (tbl->action == IWL_MIMO_SWITCH_ANTENNA_A)
1230 search_tbl->antenna_type = ANT_MAIN;
1231 else
1232 search_tbl->antenna_type = ANT_AUX;
1233
1234 rc = rs_switch_to_siso(priv, lq_data, search_tbl,
1235 index);
1236 if (!rc) {
1237 lq_data->search_better_tbl = 1;
1238 goto out;
1239 }
1240 break;
1241
1242 case IWL_MIMO_SWITCH_GI:
1243 IWL_DEBUG_HT("LQ: MIMO SWITCH TO GI\n");
1244 memcpy(search_tbl, tbl, sz);
1245 search_tbl->lq_type = LQ_MIMO;
1246 search_tbl->antenna_type = ANT_BOTH;
1247 search_tbl->action = 0;
1248 if (search_tbl->is_SGI)
1249 search_tbl->is_SGI = 0;
1250 else
1251 search_tbl->is_SGI = 1;
1252 lq_data->search_better_tbl = 1;
1253 if ((tbl->lq_type == LQ_MIMO) &&
1254 (tbl->is_SGI)) {
1255 s32 tpt = lq_data->last_tpt / 100;
1256 if (((!tbl->is_fat) &&
1257 (tpt >= expected_tpt_mimo20MHz[index])) ||
1258 ((tbl->is_fat) &&
1259 (tpt >= expected_tpt_mimo40MHz[index])))
1260 lq_data->search_better_tbl = 0;
1261 }
1262 rs_get_expected_tpt_table(lq_data, search_tbl);
1263 rs_mcs_from_tbl(&search_tbl->current_rate,
1264 search_tbl, index, is_green);
1265 goto out;
1266
1267 }
1268 tbl->action++;
1269 if (tbl->action > IWL_MIMO_SWITCH_GI)
1270 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1271
1272 if (tbl->action == start_action)
1273 break;
1274 }
1275
1276 return 0;
1277 out:
1278 tbl->action++;
1279 if (tbl->action > IWL_MIMO_SWITCH_GI)
1280 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1281 return 0;
1282
1283 }
1284
1285 static void rs_stay_in_table(struct iwl_rate_scale_priv *lq_data)
1286 {
1287 struct iwl_scale_tbl_info *tbl;
1288 int i;
1289 int active_tbl;
1290 int flush_interval_passed = 0;
1291
1292 active_tbl = lq_data->active_tbl;
1293
1294 tbl = &(lq_data->lq_info[active_tbl]);
1295
1296 if (lq_data->stay_in_tbl) {
1297
1298 if (lq_data->flush_timer)
1299 flush_interval_passed =
1300 time_after(jiffies,
1301 (unsigned long)(lq_data->flush_timer +
1302 IWL_RATE_SCALE_FLUSH_INTVL));
1303
1304 flush_interval_passed = 0;
1305 if ((lq_data->total_failed > lq_data->max_failure_limit) ||
1306 (lq_data->total_success > lq_data->max_success_limit) ||
1307 ((!lq_data->search_better_tbl) && (lq_data->flush_timer)
1308 && (flush_interval_passed))) {
1309 IWL_DEBUG_HT("LQ: stay is expired %d %d %d\n:",
1310 lq_data->total_failed,
1311 lq_data->total_success,
1312 flush_interval_passed);
1313 lq_data->stay_in_tbl = 0;
1314 lq_data->total_failed = 0;
1315 lq_data->total_success = 0;
1316 lq_data->flush_timer = 0;
1317 } else if (lq_data->table_count > 0) {
1318 lq_data->table_count++;
1319 if (lq_data->table_count >=
1320 lq_data->table_count_limit) {
1321 lq_data->table_count = 0;
1322
1323 IWL_DEBUG_HT("LQ: stay in table clear win\n");
1324 for (i = 0; i < IWL_RATE_COUNT; i++)
1325 rs_rate_scale_clear_window(
1326 &(tbl->win[i]));
1327 }
1328 }
1329
1330 if (!lq_data->stay_in_tbl) {
1331 for (i = 0; i < IWL_RATE_COUNT; i++)
1332 rs_rate_scale_clear_window(&(tbl->win[i]));
1333 }
1334 }
1335 }
1336
1337 static void rs_rate_scale_perform(struct iwl_priv *priv,
1338 struct net_device *dev,
1339 struct ieee80211_hdr *hdr,
1340 struct sta_info *sta)
1341 {
1342 int low = IWL_RATE_INVALID;
1343 int high = IWL_RATE_INVALID;
1344 int index;
1345 int i;
1346 struct iwl_rate_scale_data *window = NULL;
1347 int current_tpt = IWL_INVALID_VALUE;
1348 int low_tpt = IWL_INVALID_VALUE;
1349 int high_tpt = IWL_INVALID_VALUE;
1350 u32 fail_count;
1351 s8 scale_action = 0;
1352 u16 fc, rate_mask;
1353 u8 update_lq = 0;
1354 struct iwl_rate_scale_priv *lq_data;
1355 struct iwl_scale_tbl_info *tbl, *tbl1;
1356 u16 rate_scale_index_msk = 0;
1357 struct iwl_rate mcs_rate;
1358 u8 is_green = 0;
1359 u8 active_tbl = 0;
1360 u8 done_search = 0;
1361 u16 high_low;
1362
1363 IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1364
1365 fc = le16_to_cpu(hdr->frame_control);
1366 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
1367 /* Send management frames and broadcast/multicast data using
1368 * lowest rate. */
1369 /* TODO: this could probably be improved.. */
1370 return;
1371 }
1372
1373 if (!sta || !sta->rate_ctrl_priv)
1374 return;
1375
1376 if (!priv->lq_mngr.lq_ready) {
1377 IWL_DEBUG_RATE("still rate scaling not ready\n");
1378 return;
1379 }
1380 lq_data = (struct iwl_rate_scale_priv *)sta->rate_ctrl_priv;
1381
1382 if (!lq_data->search_better_tbl)
1383 active_tbl = lq_data->active_tbl;
1384 else
1385 active_tbl = 1 - lq_data->active_tbl;
1386
1387 tbl = &(lq_data->lq_info[active_tbl]);
1388 is_green = lq_data->is_green;
1389
1390 index = sta->last_txrate;
1391
1392 IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1393 tbl->lq_type);
1394
1395 rs_get_supported_rates(lq_data, hdr, tbl->lq_type,
1396 &rate_mask);
1397
1398 IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1399
1400 /* mask with station rate restriction */
1401 if (is_legacy(tbl->lq_type)) {
1402 if (lq_data->phymode == (u8) MODE_IEEE80211A)
1403 rate_scale_index_msk = (u16) (rate_mask &
1404 (lq_data->supp_rates << IWL_FIRST_OFDM_RATE));
1405 else
1406 rate_scale_index_msk = (u16) (rate_mask &
1407 lq_data->supp_rates);
1408
1409 } else
1410 rate_scale_index_msk = rate_mask;
1411
1412 if (!rate_scale_index_msk)
1413 rate_scale_index_msk = rate_mask;
1414
1415 if (index < 0 || !((1 << index) & rate_scale_index_msk)) {
1416 index = IWL_INVALID_VALUE;
1417 update_lq = 1;
1418
1419 /* get the lowest availabe rate */
1420 for (i = 0; i <= IWL_RATE_COUNT; i++) {
1421 if ((1 << i) & rate_scale_index_msk)
1422 index = i;
1423 }
1424
1425 if (index == IWL_INVALID_VALUE) {
1426 IWL_WARNING("Can not find a suitable rate\n");
1427 return;
1428 }
1429 }
1430
1431 if (!tbl->expected_tpt)
1432 rs_get_expected_tpt_table(lq_data, tbl);
1433
1434 window = &(tbl->win[index]);
1435
1436 fail_count = window->counter - window->success_counter;
1437 if (((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1438 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH))
1439 || (tbl->expected_tpt == NULL)) {
1440 IWL_DEBUG_RATE("LQ: still below TH succ %d total %d "
1441 "for index %d\n",
1442 window->success_counter, window->counter, index);
1443 window->average_tpt = IWL_INVALID_VALUE;
1444 rs_stay_in_table(lq_data);
1445 if (update_lq) {
1446 rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green);
1447 rs_fill_link_cmd(lq_data, &mcs_rate, &lq_data->lq);
1448 rs_send_lq_cmd(priv, &lq_data->lq, CMD_ASYNC);
1449 }
1450 goto out;
1451
1452 } else
1453 window->average_tpt = ((window->success_ratio *
1454 tbl->expected_tpt[index] + 64) / 128);
1455
1456 if (lq_data->search_better_tbl) {
1457 int success_limit = IWL_RATE_SCALE_SWITCH;
1458
1459 if ((window->success_ratio > success_limit) ||
1460 (window->average_tpt > lq_data->last_tpt)) {
1461 if (!is_legacy(tbl->lq_type)) {
1462 IWL_DEBUG_HT("LQ: we are switching to HT"
1463 " rate suc %d current tpt %d"
1464 " old tpt %d\n",
1465 window->success_ratio,
1466 window->average_tpt,
1467 lq_data->last_tpt);
1468 lq_data->enable_counter = 1;
1469 }
1470 lq_data->active_tbl = active_tbl;
1471 current_tpt = window->average_tpt;
1472 } else {
1473 tbl->lq_type = LQ_NONE;
1474 active_tbl = lq_data->active_tbl;
1475 tbl = &(lq_data->lq_info[active_tbl]);
1476
1477 index = iwl_rate_index_from_plcp(
1478 tbl->current_rate.rate_n_flags);
1479
1480 update_lq = 1;
1481 current_tpt = lq_data->last_tpt;
1482 IWL_DEBUG_HT("XXY GO BACK TO OLD TABLE\n");
1483 }
1484 lq_data->search_better_tbl = 0;
1485 done_search = 1;
1486 goto lq_update;
1487 }
1488
1489 high_low = rs_get_adjacent_rate(index, rate_scale_index_msk,
1490 tbl->lq_type);
1491 low = high_low & 0xff;
1492 high = (high_low >> 8) & 0xff;
1493
1494 current_tpt = window->average_tpt;
1495
1496 if (low != IWL_RATE_INVALID)
1497 low_tpt = tbl->win[low].average_tpt;
1498
1499 if (high != IWL_RATE_INVALID)
1500 high_tpt = tbl->win[high].average_tpt;
1501
1502
1503 scale_action = 1;
1504
1505 if ((window->success_ratio <= IWL_RATE_DECREASE_TH) ||
1506 (current_tpt == 0)) {
1507 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1508 scale_action = -1;
1509 } else if ((low_tpt == IWL_INVALID_VALUE) &&
1510 (high_tpt == IWL_INVALID_VALUE))
1511 scale_action = 1;
1512 else if ((low_tpt != IWL_INVALID_VALUE) &&
1513 (high_tpt != IWL_INVALID_VALUE) &&
1514 (low_tpt < current_tpt) &&
1515 (high_tpt < current_tpt))
1516 scale_action = 0;
1517 else {
1518 if (high_tpt != IWL_INVALID_VALUE) {
1519 if (high_tpt > current_tpt)
1520 scale_action = 1;
1521 else {
1522 IWL_DEBUG_RATE
1523 ("decrease rate because of high tpt\n");
1524 scale_action = -1;
1525 }
1526 } else if (low_tpt != IWL_INVALID_VALUE) {
1527 if (low_tpt > current_tpt) {
1528 IWL_DEBUG_RATE
1529 ("decrease rate because of low tpt\n");
1530 scale_action = -1;
1531 } else
1532 scale_action = 1;
1533 }
1534 }
1535
1536 if (scale_action == -1) {
1537 if ((low != IWL_RATE_INVALID) &&
1538 ((window->success_ratio > IWL_RATE_HIGH_TH) ||
1539 (current_tpt > (100 * tbl->expected_tpt[low]))))
1540 scale_action = 0;
1541 } else if ((scale_action == 1) &&
1542 (window->success_ratio < IWL_RATE_INCREASE_TH))
1543 scale_action = 0;
1544
1545 switch (scale_action) {
1546 case -1:
1547 if (low != IWL_RATE_INVALID) {
1548 update_lq = 1;
1549 index = low;
1550 }
1551 break;
1552 case 1:
1553 if (high != IWL_RATE_INVALID) {
1554 update_lq = 1;
1555 index = high;
1556 }
1557
1558 break;
1559 case 0:
1560 default:
1561 break;
1562 }
1563
1564 IWL_DEBUG_HT("choose rate scale index %d action %d low %d "
1565 "high %d type %d\n",
1566 index, scale_action, low, high, tbl->lq_type);
1567
1568 lq_update:
1569 if (update_lq) {
1570 rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green);
1571 rs_fill_link_cmd(lq_data, &mcs_rate, &lq_data->lq);
1572 rs_send_lq_cmd(priv, &lq_data->lq, CMD_ASYNC);
1573 }
1574 rs_stay_in_table(lq_data);
1575
1576 if (!update_lq && !done_search && !lq_data->stay_in_tbl) {
1577 lq_data->last_tpt = current_tpt;
1578
1579 if (is_legacy(tbl->lq_type))
1580 rs_move_legacy_other(priv, lq_data, index);
1581 else if (is_siso(tbl->lq_type))
1582 rs_move_siso_to_other(priv, lq_data, index);
1583 else
1584 rs_move_mimo_to_other(priv, lq_data, index);
1585
1586 if (lq_data->search_better_tbl) {
1587 tbl = &(lq_data->lq_info[(1 - lq_data->active_tbl)]);
1588 for (i = 0; i < IWL_RATE_COUNT; i++)
1589 rs_rate_scale_clear_window(&(tbl->win[i]));
1590
1591 index = iwl_rate_index_from_plcp(
1592 tbl->current_rate.rate_n_flags);
1593
1594 IWL_DEBUG_HT("Switch current mcs: %X index: %d\n",
1595 tbl->current_rate.rate_n_flags, index);
1596 rs_fill_link_cmd(lq_data, &tbl->current_rate,
1597 &lq_data->lq);
1598 rs_send_lq_cmd(priv, &lq_data->lq, CMD_ASYNC);
1599 }
1600 tbl1 = &(lq_data->lq_info[lq_data->active_tbl]);
1601
1602 if (is_legacy(tbl1->lq_type) &&
1603 #ifdef CONFIG_IWLWIFI_HT
1604 !priv->current_assoc_ht.is_ht &&
1605 #endif
1606 (lq_data->action_counter >= 1)) {
1607 lq_data->action_counter = 0;
1608 IWL_DEBUG_HT("LQ: STAY in legacy table\n");
1609 rs_set_stay_in_table(1, lq_data);
1610 }
1611
1612 if (lq_data->enable_counter &&
1613 (lq_data->action_counter >= IWL_ACTION_LIMIT)) {
1614 #ifdef CONFIG_IWLWIFI_HT_AGG
1615 if ((lq_data->last_tpt > TID_AGG_TPT_THREHOLD) &&
1616 (priv->lq_mngr.agg_ctrl.auto_agg)) {
1617 priv->lq_mngr.agg_ctrl.tid_retry =
1618 TID_ALL_SPECIFIED;
1619 schedule_work(&priv->agg_work);
1620 }
1621 #endif /*CONFIG_IWLWIFI_HT_AGG */
1622 lq_data->action_counter = 0;
1623 rs_set_stay_in_table(0, lq_data);
1624 }
1625 } else {
1626 if ((!update_lq) && (!done_search) && (!lq_data->flush_timer))
1627 lq_data->flush_timer = jiffies;
1628 }
1629
1630 out:
1631 rs_mcs_from_tbl(&tbl->current_rate, tbl, index, is_green);
1632 i = index;
1633 sta->last_txrate = i;
1634
1635 /* sta->txrate is an index to A mode rates which start
1636 * at IWL_FIRST_OFDM_RATE
1637 */
1638 if (lq_data->phymode == (u8) MODE_IEEE80211A)
1639 sta->txrate = i - IWL_FIRST_OFDM_RATE;
1640 else
1641 sta->txrate = i;
1642
1643 return;
1644 }
1645
1646
1647 static void rs_initialize_lq(struct iwl_priv *priv,
1648 struct sta_info *sta)
1649 {
1650 int i;
1651 struct iwl_rate_scale_priv *lq;
1652 struct iwl_scale_tbl_info *tbl;
1653 u8 active_tbl = 0;
1654 int rate_idx;
1655 u8 use_green = rs_use_green(priv);
1656 struct iwl_rate mcs_rate;
1657
1658 if (!sta || !sta->rate_ctrl_priv)
1659 goto out;
1660
1661 lq = (struct iwl_rate_scale_priv *)sta->rate_ctrl_priv;
1662 i = sta->last_txrate;
1663
1664 if ((lq->lq.sta_id == 0xff) &&
1665 (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
1666 goto out;
1667
1668 if (!lq->search_better_tbl)
1669 active_tbl = lq->active_tbl;
1670 else
1671 active_tbl = 1 - lq->active_tbl;
1672
1673 tbl = &(lq->lq_info[active_tbl]);
1674
1675 if ((i < 0) || (i >= IWL_RATE_COUNT))
1676 i = 0;
1677
1678 mcs_rate.rate_n_flags = iwl_rates[i].plcp ;
1679 mcs_rate.rate_n_flags |= RATE_MCS_ANT_B_MSK;
1680 mcs_rate.rate_n_flags &= ~RATE_MCS_ANT_A_MSK;
1681
1682 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
1683 mcs_rate.rate_n_flags |= RATE_MCS_CCK_MSK;
1684
1685 tbl->antenna_type = ANT_AUX;
1686 rs_get_tbl_info_from_mcs(&mcs_rate, priv->phymode, tbl, &rate_idx);
1687 if (!rs_is_ant_connected(priv->valid_antenna, tbl->antenna_type))
1688 rs_toggle_antenna(&mcs_rate, tbl);
1689
1690 rs_mcs_from_tbl(&mcs_rate, tbl, rate_idx, use_green);
1691 tbl->current_rate.rate_n_flags = mcs_rate.rate_n_flags;
1692 rs_get_expected_tpt_table(lq, tbl);
1693 rs_fill_link_cmd(lq, &mcs_rate, &lq->lq);
1694 rs_send_lq_cmd(priv, &lq->lq, CMD_ASYNC);
1695 out:
1696 return;
1697 }
1698
1699 static struct ieee80211_rate *rs_get_lowest_rate(struct ieee80211_local
1700 *local)
1701 {
1702 struct ieee80211_hw_mode *mode = local->oper_hw_mode;
1703 int i;
1704
1705 for (i = 0; i < mode->num_rates; i++) {
1706 struct ieee80211_rate *rate = &mode->rates[i];
1707
1708 if (rate->flags & IEEE80211_RATE_SUPPORTED)
1709 return rate;
1710 }
1711
1712 return &mode->rates[0];
1713 }
1714
1715 static struct ieee80211_rate *rs_get_rate(void *priv_rate,
1716 struct net_device *dev,
1717 struct sk_buff *skb,
1718 struct rate_control_extra
1719 *extra)
1720 {
1721
1722 int i;
1723 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1724 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1725 struct sta_info *sta;
1726 u16 fc;
1727 struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
1728 struct iwl_rate_scale_priv *lq;
1729
1730 IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
1731
1732 memset(extra, 0, sizeof(*extra));
1733
1734 fc = le16_to_cpu(hdr->frame_control);
1735 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
1736 /* Send management frames and broadcast/multicast data using
1737 * lowest rate. */
1738 /* TODO: this could probably be improved.. */
1739 return rs_get_lowest_rate(local);
1740 }
1741
1742 sta = sta_info_get(local, hdr->addr1);
1743
1744 if (!sta || !sta->rate_ctrl_priv) {
1745 if (sta)
1746 sta_info_put(sta);
1747 return rs_get_lowest_rate(local);
1748 }
1749
1750 lq = (struct iwl_rate_scale_priv *)sta->rate_ctrl_priv;
1751 i = sta->last_txrate;
1752
1753 if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) && !lq->ibss_sta_added) {
1754 u8 sta_id = iwl_hw_find_station(priv, hdr->addr1);
1755 DECLARE_MAC_BUF(mac);
1756
1757 if (sta_id == IWL_INVALID_STATION) {
1758 IWL_DEBUG_RATE("LQ: ADD station %s\n",
1759 print_mac(mac, hdr->addr1));
1760 sta_id = iwl_add_station(priv,
1761 hdr->addr1, 0, CMD_ASYNC);
1762 }
1763 if ((sta_id != IWL_INVALID_STATION)) {
1764 lq->lq.sta_id = sta_id;
1765 lq->lq.rs_table[0].rate_n_flags = 0;
1766 lq->ibss_sta_added = 1;
1767 rs_initialize_lq(priv, sta);
1768 }
1769 if (!lq->ibss_sta_added)
1770 goto done;
1771 }
1772
1773 done:
1774 sta_info_put(sta);
1775 if ((i < 0) || (i > IWL_RATE_COUNT))
1776 return rs_get_lowest_rate(local);
1777
1778 return &priv->ieee_rates[i];
1779 }
1780
1781 static void *rs_alloc_sta(void *priv, gfp_t gfp)
1782 {
1783 struct iwl_rate_scale_priv *crl;
1784 int i, j;
1785
1786 IWL_DEBUG_RATE("create station rate scale window\n");
1787
1788 crl = kzalloc(sizeof(struct iwl_rate_scale_priv), gfp);
1789
1790 if (crl == NULL)
1791 return NULL;
1792 crl->lq.sta_id = 0xff;
1793
1794
1795 for (j = 0; j < LQ_SIZE; j++)
1796 for (i = 0; i < IWL_RATE_COUNT; i++)
1797 rs_rate_scale_clear_window(&(crl->lq_info[j].win[i]));
1798
1799 return crl;
1800 }
1801
1802 static void rs_rate_init(void *priv_rate, void *priv_sta,
1803 struct ieee80211_local *local,
1804 struct sta_info *sta)
1805 {
1806 int i, j;
1807 struct ieee80211_hw_mode *mode = local->oper_hw_mode;
1808 struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
1809 struct iwl_rate_scale_priv *crl = priv_sta;
1810
1811 crl->flush_timer = 0;
1812 crl->supp_rates = sta->supp_rates;
1813 sta->txrate = 3;
1814 for (j = 0; j < LQ_SIZE; j++)
1815 for (i = 0; i < IWL_RATE_COUNT; i++)
1816 rs_rate_scale_clear_window(&(crl->lq_info[j].win[i]));
1817
1818 IWL_DEBUG_RATE("rate scale global init\n");
1819 /* TODO: what is a good starting rate for STA? About middle? Maybe not
1820 * the lowest or the highest rate.. Could consider using RSSI from
1821 * previous packets? Need to have IEEE 802.1X auth succeed immediately
1822 * after assoc.. */
1823
1824 crl->ibss_sta_added = 0;
1825 if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
1826 u8 sta_id = iwl_hw_find_station(priv, sta->addr);
1827 DECLARE_MAC_BUF(mac);
1828
1829 /* for IBSS the call are from tasklet */
1830 IWL_DEBUG_HT("LQ: ADD station %s\n",
1831 print_mac(mac, sta->addr));
1832
1833 if (sta_id == IWL_INVALID_STATION) {
1834 IWL_DEBUG_RATE("LQ: ADD station %s\n",
1835 print_mac(mac, sta->addr));
1836 sta_id = iwl_add_station(priv,
1837 sta->addr, 0, CMD_ASYNC);
1838 }
1839 if ((sta_id != IWL_INVALID_STATION)) {
1840 crl->lq.sta_id = sta_id;
1841 crl->lq.rs_table[0].rate_n_flags = 0;
1842 }
1843 /* FIXME: this is w/a remove it later */
1844 priv->assoc_station_added = 1;
1845 }
1846
1847 for (i = 0; i < mode->num_rates; i++) {
1848 if ((sta->supp_rates & BIT(i)) &&
1849 (mode->rates[i].flags & IEEE80211_RATE_SUPPORTED))
1850 sta->txrate = i;
1851 }
1852 sta->last_txrate = sta->txrate;
1853 /* For MODE_IEEE80211A mode cck rate are at end
1854 * rate table
1855 */
1856 if (local->hw.conf.phymode == MODE_IEEE80211A)
1857 sta->last_txrate += IWL_FIRST_OFDM_RATE;
1858
1859 crl->is_dup = priv->is_dup;
1860 crl->valid_antenna = priv->valid_antenna;
1861 crl->antenna = priv->antenna;
1862 crl->is_green = rs_use_green(priv);
1863 crl->active_rate = priv->active_rate;
1864 crl->active_rate &= ~(0x1000);
1865 crl->active_rate_basic = priv->active_rate_basic;
1866 crl->phymode = priv->phymode;
1867 #ifdef CONFIG_IWLWIFI_HT
1868 crl->active_siso_rate = (priv->current_assoc_ht.supp_rates[0] << 1);
1869 crl->active_siso_rate |= (priv->current_assoc_ht.supp_rates[0] & 0x1);
1870 crl->active_siso_rate &= ~((u16)0x2);
1871 crl->active_siso_rate = crl->active_siso_rate << IWL_FIRST_OFDM_RATE;
1872
1873 crl->active_mimo_rate = (priv->current_assoc_ht.supp_rates[1] << 1);
1874 crl->active_mimo_rate |= (priv->current_assoc_ht.supp_rates[1] & 0x1);
1875 crl->active_mimo_rate &= ~((u16)0x2);
1876 crl->active_mimo_rate = crl->active_mimo_rate << IWL_FIRST_OFDM_RATE;
1877 IWL_DEBUG_HT("MIMO RATE 0x%X SISO MASK 0x%X\n", crl->active_siso_rate,
1878 crl->active_mimo_rate);
1879 #endif /*CONFIG_IWLWIFI_HT*/
1880 #ifdef CONFIG_MAC80211_DEBUGFS
1881 crl->drv = priv;
1882 #endif
1883
1884 if (priv->assoc_station_added)
1885 priv->lq_mngr.lq_ready = 1;
1886
1887 rs_initialize_lq(priv, sta);
1888 }
1889
1890 static void rs_fill_link_cmd(struct iwl_rate_scale_priv *lq_data,
1891 struct iwl_rate *tx_mcs,
1892 struct iwl_link_quality_cmd *lq_cmd)
1893 {
1894 int index = 0;
1895 int rate_idx;
1896 int repeat_rate = 0;
1897 u8 ant_toggle_count = 0;
1898 u8 use_ht_possible = 1;
1899 struct iwl_rate new_rate;
1900 struct iwl_scale_tbl_info tbl_type = { 0 };
1901
1902 rs_dbgfs_set_mcs(lq_data, tx_mcs, index);
1903
1904 rs_get_tbl_info_from_mcs(tx_mcs, lq_data->phymode,
1905 &tbl_type, &rate_idx);
1906
1907 if (is_legacy(tbl_type.lq_type)) {
1908 ant_toggle_count = 1;
1909 repeat_rate = IWL_NUMBER_TRY;
1910 } else
1911 repeat_rate = IWL_HT_NUMBER_TRY;
1912
1913 lq_cmd->general_params.mimo_delimiter =
1914 is_mimo(tbl_type.lq_type) ? 1 : 0;
1915 lq_cmd->rs_table[index].rate_n_flags =
1916 cpu_to_le32(tx_mcs->rate_n_flags);
1917 new_rate.rate_n_flags = tx_mcs->rate_n_flags;
1918
1919 if (is_mimo(tbl_type.lq_type) || (tbl_type.antenna_type == ANT_MAIN))
1920 lq_cmd->general_params.single_stream_ant_msk = 1;
1921 else
1922 lq_cmd->general_params.single_stream_ant_msk = 2;
1923
1924 index++;
1925 repeat_rate--;
1926
1927 while (index < LINK_QUAL_MAX_RETRY_NUM) {
1928 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
1929 if (is_legacy(tbl_type.lq_type)) {
1930 if (ant_toggle_count <
1931 NUM_TRY_BEFORE_ANTENNA_TOGGLE)
1932 ant_toggle_count++;
1933 else {
1934 rs_toggle_antenna(&new_rate, &tbl_type);
1935 ant_toggle_count = 1;
1936 }
1937 }
1938
1939 rs_dbgfs_set_mcs(lq_data, &new_rate, index);
1940 lq_cmd->rs_table[index].rate_n_flags =
1941 cpu_to_le32(new_rate.rate_n_flags);
1942 repeat_rate--;
1943 index++;
1944 }
1945
1946 rs_get_tbl_info_from_mcs(&new_rate, lq_data->phymode, &tbl_type,
1947 &rate_idx);
1948
1949 if (is_mimo(tbl_type.lq_type))
1950 lq_cmd->general_params.mimo_delimiter = index;
1951
1952 rs_get_lower_rate(lq_data, &tbl_type, rate_idx,
1953 use_ht_possible, &new_rate);
1954
1955 if (is_legacy(tbl_type.lq_type)) {
1956 if (ant_toggle_count < NUM_TRY_BEFORE_ANTENNA_TOGGLE)
1957 ant_toggle_count++;
1958 else {
1959 rs_toggle_antenna(&new_rate, &tbl_type);
1960 ant_toggle_count = 1;
1961 }
1962 repeat_rate = IWL_NUMBER_TRY;
1963 } else
1964 repeat_rate = IWL_HT_NUMBER_TRY;
1965
1966 use_ht_possible = 0;
1967
1968 rs_dbgfs_set_mcs(lq_data, &new_rate, index);
1969 lq_cmd->rs_table[index].rate_n_flags =
1970 cpu_to_le32(new_rate.rate_n_flags);
1971
1972 index++;
1973 repeat_rate--;
1974 }
1975
1976 lq_cmd->general_params.dual_stream_ant_msk = 3;
1977 lq_cmd->agg_params.agg_dis_start_th = 3;
1978 lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
1979 }
1980
1981 static void *rs_alloc(struct ieee80211_local *local)
1982 {
1983 return local->hw.priv;
1984 }
1985 /* rate scale requires free function to be implemented */
1986 static void rs_free(void *priv_rate)
1987 {
1988 return;
1989 }
1990
1991 static void rs_clear(void *priv_rate)
1992 {
1993 struct iwl_priv *priv = (struct iwl_priv *) priv_rate;
1994
1995 IWL_DEBUG_RATE("enter\n");
1996
1997 priv->lq_mngr.lq_ready = 0;
1998 #ifdef CONFIG_IWLWIFI_HT
1999 #ifdef CONFIG_IWLWIFI_HT_AGG
2000 if (priv->lq_mngr.agg_ctrl.granted_ba)
2001 iwl4965_turn_off_agg(priv, TID_ALL_SPECIFIED);
2002 #endif /*CONFIG_IWLWIFI_HT_AGG */
2003 #endif /* CONFIG_IWLWIFI_HT */
2004
2005 IWL_DEBUG_RATE("leave\n");
2006 }
2007
2008 static void rs_free_sta(void *priv, void *priv_sta)
2009 {
2010 struct iwl_rate_scale_priv *rs_priv = priv_sta;
2011
2012 IWL_DEBUG_RATE("enter\n");
2013 kfree(rs_priv);
2014 IWL_DEBUG_RATE("leave\n");
2015 }
2016
2017
2018 #ifdef CONFIG_MAC80211_DEBUGFS
2019 static int open_file_generic(struct inode *inode, struct file *file)
2020 {
2021 file->private_data = inode->i_private;
2022 return 0;
2023 }
2024 static void rs_dbgfs_set_mcs(struct iwl_rate_scale_priv *rs_priv,
2025 struct iwl_rate *mcs, int index)
2026 {
2027 const u32 cck_rate = 0x820A;
2028 if (rs_priv->dbg_fixed.rate_n_flags) {
2029 if (index < 12)
2030 mcs->rate_n_flags = rs_priv->dbg_fixed.rate_n_flags;
2031 else
2032 mcs->rate_n_flags = cck_rate;
2033 IWL_DEBUG_RATE("Fixed rate ON\n");
2034 return;
2035 }
2036
2037 IWL_DEBUG_RATE("Fixed rate OFF\n");
2038 }
2039
2040 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2041 const char __user *user_buf, size_t count, loff_t *ppos)
2042 {
2043 struct iwl_rate_scale_priv *rs_priv = file->private_data;
2044 char buf[64];
2045 int buf_size;
2046 u32 parsed_rate;
2047
2048 memset(buf, 0, sizeof(buf));
2049 buf_size = min(count, sizeof(buf) - 1);
2050 if (copy_from_user(buf, user_buf, buf_size))
2051 return -EFAULT;
2052
2053 if (sscanf(buf, "%x", &parsed_rate) == 1)
2054 rs_priv->dbg_fixed.rate_n_flags = parsed_rate;
2055 else
2056 rs_priv->dbg_fixed.rate_n_flags = 0;
2057
2058 rs_priv->active_rate = 0x0FFF;
2059 rs_priv->active_siso_rate = 0x1FD0;
2060 rs_priv->active_mimo_rate = 0x1FD0;
2061
2062 IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2063 rs_priv->lq.sta_id, rs_priv->dbg_fixed.rate_n_flags);
2064
2065 if (rs_priv->dbg_fixed.rate_n_flags) {
2066 rs_fill_link_cmd(rs_priv, &rs_priv->dbg_fixed, &rs_priv->lq);
2067 rs_send_lq_cmd(rs_priv->drv, &rs_priv->lq, CMD_ASYNC);
2068 }
2069
2070 return count;
2071 }
2072
2073 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2074 char __user *user_buf, size_t count, loff_t *ppos)
2075 {
2076 char buff[1024];
2077 int desc = 0;
2078 int i = 0;
2079
2080 struct iwl_rate_scale_priv *rs_priv = file->private_data;
2081
2082 desc += sprintf(buff+desc, "sta_id %d\n", rs_priv->lq.sta_id);
2083 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2084 rs_priv->total_failed, rs_priv->total_success,
2085 rs_priv->active_rate);
2086 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2087 rs_priv->dbg_fixed.rate_n_flags);
2088 desc += sprintf(buff+desc, "general:"
2089 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2090 rs_priv->lq.general_params.flags,
2091 rs_priv->lq.general_params.mimo_delimiter,
2092 rs_priv->lq.general_params.single_stream_ant_msk,
2093 rs_priv->lq.general_params.dual_stream_ant_msk);
2094
2095 desc += sprintf(buff+desc, "agg:"
2096 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2097 le16_to_cpu(rs_priv->lq.agg_params.agg_time_limit),
2098 rs_priv->lq.agg_params.agg_dis_start_th,
2099 rs_priv->lq.agg_params.agg_frame_cnt_limit);
2100
2101 desc += sprintf(buff+desc,
2102 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2103 rs_priv->lq.general_params.start_rate_index[0],
2104 rs_priv->lq.general_params.start_rate_index[1],
2105 rs_priv->lq.general_params.start_rate_index[2],
2106 rs_priv->lq.general_params.start_rate_index[3]);
2107
2108
2109 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2110 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
2111 i, le32_to_cpu(rs_priv->lq.rs_table[i].rate_n_flags));
2112
2113 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2114 }
2115
2116 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2117 .write = rs_sta_dbgfs_scale_table_write,
2118 .read = rs_sta_dbgfs_scale_table_read,
2119 .open = open_file_generic,
2120 };
2121 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2122 char __user *user_buf, size_t count, loff_t *ppos)
2123 {
2124 char buff[1024];
2125 int desc = 0;
2126 int i, j;
2127
2128 struct iwl_rate_scale_priv *rs_priv = file->private_data;
2129 for (i = 0; i < LQ_SIZE; i++) {
2130 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2131 "rate=0x%X\n",
2132 rs_priv->active_tbl == i?"*":"x",
2133 rs_priv->lq_info[i].lq_type,
2134 rs_priv->lq_info[i].is_SGI,
2135 rs_priv->lq_info[i].is_fat,
2136 rs_priv->lq_info[i].is_dup,
2137 rs_priv->lq_info[i].current_rate.rate_n_flags);
2138 for (j = 0; j < IWL_RATE_COUNT; j++) {
2139 desc += sprintf(buff+desc,
2140 "counter=%d success=%d %%=%d\n",
2141 rs_priv->lq_info[i].win[j].counter,
2142 rs_priv->lq_info[i].win[j].success_counter,
2143 rs_priv->lq_info[i].win[j].success_ratio);
2144 }
2145 }
2146 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2147 }
2148
2149 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2150 .read = rs_sta_dbgfs_stats_table_read,
2151 .open = open_file_generic,
2152 };
2153
2154 static void rs_add_debugfs(void *priv, void *priv_sta,
2155 struct dentry *dir)
2156 {
2157 struct iwl_rate_scale_priv *rs_priv = priv_sta;
2158 rs_priv->rs_sta_dbgfs_scale_table_file =
2159 debugfs_create_file("rate_scale_table", 0600, dir,
2160 rs_priv, &rs_sta_dbgfs_scale_table_ops);
2161 rs_priv->rs_sta_dbgfs_stats_table_file =
2162 debugfs_create_file("rate_stats_table", 0600, dir,
2163 rs_priv, &rs_sta_dbgfs_stats_table_ops);
2164 }
2165
2166 static void rs_remove_debugfs(void *priv, void *priv_sta)
2167 {
2168 struct iwl_rate_scale_priv *rs_priv = priv_sta;
2169 debugfs_remove(rs_priv->rs_sta_dbgfs_scale_table_file);
2170 debugfs_remove(rs_priv->rs_sta_dbgfs_stats_table_file);
2171 }
2172 #endif
2173
2174 static struct rate_control_ops rs_ops = {
2175 .module = NULL,
2176 .name = RS_NAME,
2177 .tx_status = rs_tx_status,
2178 .get_rate = rs_get_rate,
2179 .rate_init = rs_rate_init,
2180 .clear = rs_clear,
2181 .alloc = rs_alloc,
2182 .free = rs_free,
2183 .alloc_sta = rs_alloc_sta,
2184 .free_sta = rs_free_sta,
2185 #ifdef CONFIG_MAC80211_DEBUGFS
2186 .add_sta_debugfs = rs_add_debugfs,
2187 .remove_sta_debugfs = rs_remove_debugfs,
2188 #endif
2189 };
2190
2191 int iwl_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id)
2192 {
2193 struct ieee80211_local *local = hw_to_local(hw);
2194 struct iwl_priv *priv = hw->priv;
2195 struct iwl_rate_scale_priv *rs_priv;
2196 struct sta_info *sta;
2197 int count = 0, i;
2198 u32 samples = 0, success = 0, good = 0;
2199 unsigned long now = jiffies;
2200 u32 max_time = 0;
2201 u8 lq_type, antenna;
2202
2203 sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
2204 if (!sta || !sta->rate_ctrl_priv) {
2205 if (sta) {
2206 sta_info_put(sta);
2207 IWL_DEBUG_RATE("leave - no private rate data!\n");
2208 } else
2209 IWL_DEBUG_RATE("leave - no station!\n");
2210 return sprintf(buf, "station %d not found\n", sta_id);
2211 }
2212
2213 rs_priv = (void *)sta->rate_ctrl_priv;
2214
2215 lq_type = rs_priv->lq_info[rs_priv->active_tbl].lq_type;
2216 antenna = rs_priv->lq_info[rs_priv->active_tbl].antenna_type;
2217
2218 if (is_legacy(lq_type))
2219 i = IWL_RATE_54M_INDEX;
2220 else
2221 i = IWL_RATE_60M_INDEX;
2222 while (1) {
2223 u64 mask;
2224 int j;
2225 int active = rs_priv->active_tbl;
2226
2227 count +=
2228 sprintf(&buf[count], " %2dMbs: ", iwl_rates[i].ieee / 2);
2229
2230 mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1));
2231 for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1)
2232 buf[count++] =
2233 (rs_priv->lq_info[active].win[i].data & mask)
2234 ? '1' : '0';
2235
2236 samples += rs_priv->lq_info[active].win[i].counter;
2237 good += rs_priv->lq_info[active].win[i].success_counter;
2238 success += rs_priv->lq_info[active].win[i].success_counter *
2239 iwl_rates[i].ieee;
2240
2241 if (rs_priv->lq_info[active].win[i].stamp) {
2242 int delta =
2243 jiffies_to_msecs(now -
2244 rs_priv->lq_info[active].win[i].stamp);
2245
2246 if (delta > max_time)
2247 max_time = delta;
2248
2249 count += sprintf(&buf[count], "%5dms\n", delta);
2250 } else
2251 buf[count++] = '\n';
2252
2253 j = iwl_get_prev_ieee_rate(i);
2254 if (j == i)
2255 break;
2256 i = j;
2257 }
2258
2259 /* Display the average rate of all samples taken.
2260 *
2261 * NOTE: We multiple # of samples by 2 since the IEEE measurement
2262 * added from iwl_rates is actually 2X the rate */
2263 if (samples)
2264 count += sprintf(&buf[count],
2265 "\nAverage rate is %3d.%02dMbs over last %4dms\n"
2266 "%3d%% success (%d good packets over %d tries)\n",
2267 success / (2 * samples), (success * 5 / samples) % 10,
2268 max_time, good * 100 / samples, good, samples);
2269 else
2270 count += sprintf(&buf[count], "\nAverage rate: 0Mbs\n");
2271 count += sprintf(&buf[count], "\nrate scale type %d anntena %d "
2272 "active_search %d rate index %d\n", lq_type, antenna,
2273 rs_priv->search_better_tbl, sta->last_txrate);
2274
2275 sta_info_put(sta);
2276 return count;
2277 }
2278
2279 void iwl_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
2280 {
2281 struct iwl_priv *priv = hw->priv;
2282
2283 priv->lq_mngr.lq_ready = 1;
2284 }
2285
2286 void iwl_rate_control_register(struct ieee80211_hw *hw)
2287 {
2288 ieee80211_rate_control_register(&rs_ops);
2289 }
2290
2291 void iwl_rate_control_unregister(struct ieee80211_hw *hw)
2292 {
2293 ieee80211_rate_control_unregister(&rs_ops);
2294 }
2295
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