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Merge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus
[wrt350n-kernel.git] / drivers / net / wireless / iwlwifi / iwl-4965-rs.c
blobd06462264147450bc1da86a5b21665058bab8c15
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/ieee80211_rate.h"
40
41 #include "iwl-4965.h"
42 #include "iwl-helpers.h"
43
44 #define RS_NAME "iwl-4965-rs"
45
46 #define NUM_TRY_BEFORE_ANTENNA_TOGGLE 1
47 #define IWL_NUMBER_TRY 1
48 #define IWL_HT_NUMBER_TRY 3
49
50 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
51 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
52 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
53
54 /* max time to accum history 2 seconds */
55 #define IWL_RATE_SCALE_FLUSH_INTVL (2*HZ)
56
57 static u8 rs_ht_to_legacy[] = {
58 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
59 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
60 IWL_RATE_6M_INDEX,
61 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
62 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
63 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
64 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
65 };
66
67 struct iwl4965_rate {
68 u32 rate_n_flags;
69 } __attribute__ ((packed));
70
71 /**
72 * struct iwl4965_rate_scale_data -- tx success history for one rate
73 */
74 struct iwl4965_rate_scale_data {
75 u64 data; /* bitmap of successful frames */
76 s32 success_counter; /* number of frames successful */
77 s32 success_ratio; /* per-cent * 128 */
78 s32 counter; /* number of frames attempted */
79 s32 average_tpt; /* success ratio * expected throughput */
80 unsigned long stamp;
81 };
82
83 /**
84 * struct iwl4965_scale_tbl_info -- tx params and success history for all rates
85 *
86 * There are two of these in struct iwl_rate_scale_priv,
87 * one for "active", and one for "search".
88 */
89 struct iwl4965_scale_tbl_info {
90 enum iwl4965_table_type lq_type;
91 enum iwl4965_antenna_type antenna_type;
92 u8 is_SGI; /* 1 = short guard interval */
93 u8 is_fat; /* 1 = 40 MHz channel width */
94 u8 is_dup; /* 1 = duplicated data streams */
95 u8 action; /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
96 s32 *expected_tpt; /* throughput metrics; expected_tpt_G, etc. */
97 struct iwl4965_rate current_rate; /* rate_n_flags, uCode API format */
98 struct iwl4965_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
99 };
100
101 /**
102 * struct iwl_rate_scale_priv -- driver's rate scaling private structure
103 *
104 * Pointer to this gets passed back and forth between driver and mac80211.
105 */
106 struct iwl4965_lq_sta {
107 u8 active_tbl; /* index of active table, range 0-1 */
108 u8 enable_counter; /* indicates HT mode */
109 u8 stay_in_tbl; /* 1: disallow, 0: allow search for new mode */
110 u8 search_better_tbl; /* 1: currently trying alternate mode */
111 s32 last_tpt;
112
113 /* The following determine when to search for a new mode */
114 u32 table_count_limit;
115 u32 max_failure_limit; /* # failed frames before new search */
116 u32 max_success_limit; /* # successful frames before new search */
117 u32 table_count;
118 u32 total_failed; /* total failed frames, any/all rates */
119 u32 total_success; /* total successful frames, any/all rates */
120 u32 flush_timer; /* time staying in mode before new search */
121
122 u8 action_counter; /* # mode-switch actions tried */
123 u8 antenna;
124 u8 valid_antenna;
125 u8 is_green;
126 u8 is_dup;
127 u8 phymode;
128 u8 ibss_sta_added;
129
130 /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
131 u32 supp_rates;
132 u16 active_rate;
133 u16 active_siso_rate;
134 u16 active_mimo_rate;
135 u16 active_rate_basic;
136
137 struct iwl4965_link_quality_cmd lq;
138 struct iwl4965_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
139 #ifdef CONFIG_MAC80211_DEBUGFS
140 struct dentry *rs_sta_dbgfs_scale_table_file;
141 struct dentry *rs_sta_dbgfs_stats_table_file;
142 struct iwl4965_rate dbg_fixed;
143 struct iwl4965_priv *drv;
144 #endif
145 };
146
147 static void rs_rate_scale_perform(struct iwl4965_priv *priv,
148 struct net_device *dev,
149 struct ieee80211_hdr *hdr,
150 struct sta_info *sta);
151 static void rs_fill_link_cmd(struct iwl4965_lq_sta *lq_sta,
152 struct iwl4965_rate *tx_mcs,
153 struct iwl4965_link_quality_cmd *tbl);
154
155
156 #ifdef CONFIG_MAC80211_DEBUGFS
157 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
158 struct iwl4965_rate *mcs, int index);
159 #else
160 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
161 struct iwl4965_rate *mcs, int index)
162 {}
163 #endif
164
165 /*
166 * Expected throughput metrics for following rates:
167 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
168 * "G" is the only table that supports CCK (the first 4 rates).
169 */
170 static s32 expected_tpt_A[IWL_RATE_COUNT] = {
171 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
172 };
173
174 static s32 expected_tpt_G[IWL_RATE_COUNT] = {
175 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
176 };
177
178 static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
179 0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
180 };
181
182 static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
183 0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
184 };
185
186 static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
187 0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
188 };
189
190 static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
191 0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
192 };
193
194 static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
195 0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
196 };
197
198 static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
199 0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
200 };
201
202 static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
203 0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
204 };
205
206 static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
207 0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
208 };
209
210 static int iwl4965_lq_sync_callback(struct iwl4965_priv *priv,
211 struct iwl4965_cmd *cmd, struct sk_buff *skb)
212 {
213 /*We didn't cache the SKB; let the caller free it */
214 return 1;
215 }
216
217 static inline u8 iwl4965_rate_get_rate(u32 rate_n_flags)
218 {
219 return (u8)(rate_n_flags & 0xFF);
220 }
221
222 static int rs_send_lq_cmd(struct iwl4965_priv *priv,
223 struct iwl4965_link_quality_cmd *lq, u8 flags)
224 {
225 #ifdef CONFIG_IWL4965_DEBUG
226 int i;
227 #endif
228 struct iwl4965_host_cmd cmd = {
229 .id = REPLY_TX_LINK_QUALITY_CMD,
230 .len = sizeof(struct iwl4965_link_quality_cmd),
231 .meta.flags = flags,
232 .data = lq,
233 };
234
235 if ((lq->sta_id == 0xFF) &&
236 (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
237 return -EINVAL;
238
239 if (lq->sta_id == 0xFF)
240 lq->sta_id = IWL_AP_ID;
241
242 IWL_DEBUG_RATE("lq station id 0x%x\n", lq->sta_id);
243 IWL_DEBUG_RATE("lq dta 0x%X 0x%X\n",
244 lq->general_params.single_stream_ant_msk,
245 lq->general_params.dual_stream_ant_msk);
246 #ifdef CONFIG_IWL4965_DEBUG
247 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
248 IWL_DEBUG_RATE("lq index %d 0x%X\n",
249 i, lq->rs_table[i].rate_n_flags);
250 #endif
251
252 if (flags & CMD_ASYNC)
253 cmd.meta.u.callback = iwl4965_lq_sync_callback;
254
255 if (iwl4965_is_associated(priv) && priv->assoc_station_added &&
256 priv->lq_mngr.lq_ready)
257 return iwl4965_send_cmd(priv, &cmd);
258
259 return 0;
260 }
261
262 static void rs_rate_scale_clear_window(struct iwl4965_rate_scale_data *window)
263 {
264 window->data = 0;
265 window->success_counter = 0;
266 window->success_ratio = IWL_INVALID_VALUE;
267 window->counter = 0;
268 window->average_tpt = IWL_INVALID_VALUE;
269 window->stamp = 0;
270 }
271
272 /**
273 * rs_collect_tx_data - Update the success/failure sliding window
274 *
275 * We keep a sliding window of the last 62 packets transmitted
276 * at this rate. window->data contains the bitmask of successful
277 * packets.
278 */
279 static int rs_collect_tx_data(struct iwl4965_rate_scale_data *windows,
280 int scale_index, s32 tpt, u32 status)
281 {
282 struct iwl4965_rate_scale_data *window = NULL;
283 u64 mask;
284 u8 win_size = IWL_RATE_MAX_WINDOW;
285 s32 fail_count;
286
287 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
288 return -EINVAL;
289
290 /* Select data for current tx bit rate */
291 window = &(windows[scale_index]);
292
293 /*
294 * Keep track of only the latest 62 tx frame attempts in this rate's
295 * history window; anything older isn't really relevant any more.
296 * If we have filled up the sliding window, drop the oldest attempt;
297 * if the oldest attempt (highest bit in bitmap) shows "success",
298 * subtract "1" from the success counter (this is the main reason
299 * we keep these bitmaps!).
300 */
301 if (window->counter >= win_size) {
302 window->counter = win_size - 1;
303 mask = 1;
304 mask = (mask << (win_size - 1));
305 if ((window->data & mask)) {
306 window->data &= ~mask;
307 window->success_counter = window->success_counter - 1;
308 }
309 }
310
311 /* Increment frames-attempted counter */
312 window->counter = window->counter + 1;
313
314 /* Shift bitmap by one frame (throw away oldest history),
315 * OR in "1", and increment "success" if this frame was successful. */
316 mask = window->data;
317 window->data = (mask << 1);
318 if (status != 0) {
319 window->success_counter = window->success_counter + 1;
320 window->data |= 0x1;
321 }
322
323 /* Calculate current success ratio, avoid divide-by-0! */
324 if (window->counter > 0)
325 window->success_ratio = 128 * (100 * window->success_counter)
326 / window->counter;
327 else
328 window->success_ratio = IWL_INVALID_VALUE;
329
330 fail_count = window->counter - window->success_counter;
331
332 /* Calculate average throughput, if we have enough history. */
333 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
334 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
335 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
336 else
337 window->average_tpt = IWL_INVALID_VALUE;
338
339 /* Tag this window as having been updated */
340 window->stamp = jiffies;
341
342 return 0;
343 }
344
345 /*
346 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
347 */
348 static void rs_mcs_from_tbl(struct iwl4965_rate *mcs_rate,
349 struct iwl4965_scale_tbl_info *tbl,
350 int index, u8 use_green)
351 {
352 if (is_legacy(tbl->lq_type)) {
353 mcs_rate->rate_n_flags = iwl4965_rates[index].plcp;
354 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
355 mcs_rate->rate_n_flags |= RATE_MCS_CCK_MSK;
356
357 } else if (is_siso(tbl->lq_type)) {
358 if (index > IWL_LAST_OFDM_RATE)
359 index = IWL_LAST_OFDM_RATE;
360 mcs_rate->rate_n_flags = iwl4965_rates[index].plcp_siso |
361 RATE_MCS_HT_MSK;
362 } else {
363 if (index > IWL_LAST_OFDM_RATE)
364 index = IWL_LAST_OFDM_RATE;
365 mcs_rate->rate_n_flags = iwl4965_rates[index].plcp_mimo |
366 RATE_MCS_HT_MSK;
367 }
368
369 switch (tbl->antenna_type) {
370 case ANT_BOTH:
371 mcs_rate->rate_n_flags |= RATE_MCS_ANT_AB_MSK;
372 break;
373 case ANT_MAIN:
374 mcs_rate->rate_n_flags |= RATE_MCS_ANT_A_MSK;
375 break;
376 case ANT_AUX:
377 mcs_rate->rate_n_flags |= RATE_MCS_ANT_B_MSK;
378 break;
379 case ANT_NONE:
380 break;
381 }
382
383 if (is_legacy(tbl->lq_type))
384 return;
385
386 if (tbl->is_fat) {
387 if (tbl->is_dup)
388 mcs_rate->rate_n_flags |= RATE_MCS_DUP_MSK;
389 else
390 mcs_rate->rate_n_flags |= RATE_MCS_FAT_MSK;
391 }
392 if (tbl->is_SGI)
393 mcs_rate->rate_n_flags |= RATE_MCS_SGI_MSK;
394
395 if (use_green) {
396 mcs_rate->rate_n_flags |= RATE_MCS_GF_MSK;
397 if (is_siso(tbl->lq_type))
398 mcs_rate->rate_n_flags &= ~RATE_MCS_SGI_MSK;
399 }
400 }
401
402 /*
403 * Interpret uCode API's rate_n_flags format,
404 * fill "search" or "active" tx mode table.
405 */
406 static int rs_get_tbl_info_from_mcs(const struct iwl4965_rate *mcs_rate,
407 int phymode, struct iwl4965_scale_tbl_info *tbl,
408 int *rate_idx)
409 {
410 int index;
411 u32 ant_msk;
412
413 index = iwl4965_rate_index_from_plcp(mcs_rate->rate_n_flags);
414
415 if (index == IWL_RATE_INVALID) {
416 *rate_idx = -1;
417 return -EINVAL;
418 }
419 tbl->is_SGI = 0; /* default legacy setup */
420 tbl->is_fat = 0;
421 tbl->is_dup = 0;
422 tbl->antenna_type = ANT_BOTH; /* default MIMO setup */
423
424 /* legacy rate format */
425 if (!(mcs_rate->rate_n_flags & RATE_MCS_HT_MSK)) {
426 ant_msk = (mcs_rate->rate_n_flags & RATE_MCS_ANT_AB_MSK);
427
428 if (ant_msk == RATE_MCS_ANT_AB_MSK)
429 tbl->lq_type = LQ_NONE;
430 else {
431
432 if (phymode == MODE_IEEE80211A)
433 tbl->lq_type = LQ_A;
434 else
435 tbl->lq_type = LQ_G;
436
437 if (mcs_rate->rate_n_flags & RATE_MCS_ANT_A_MSK)
438 tbl->antenna_type = ANT_MAIN;
439 else
440 tbl->antenna_type = ANT_AUX;
441 }
442 *rate_idx = index;
443
444 /* HT rate format, SISO (might be 20 MHz legacy or 40 MHz fat width) */
445 } else if (iwl4965_rate_get_rate(mcs_rate->rate_n_flags)
446 <= IWL_RATE_SISO_60M_PLCP) {
447 tbl->lq_type = LQ_SISO;
448
449 ant_msk = (mcs_rate->rate_n_flags & RATE_MCS_ANT_AB_MSK);
450 if (ant_msk == RATE_MCS_ANT_AB_MSK)
451 tbl->lq_type = LQ_NONE;
452 else {
453 if (mcs_rate->rate_n_flags & RATE_MCS_ANT_A_MSK)
454 tbl->antenna_type = ANT_MAIN;
455 else
456 tbl->antenna_type = ANT_AUX;
457 }
458 if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK)
459 tbl->is_SGI = 1;
460
461 if ((mcs_rate->rate_n_flags & RATE_MCS_FAT_MSK) ||
462 (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK))
463 tbl->is_fat = 1;
464
465 if (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK)
466 tbl->is_dup = 1;
467
468 *rate_idx = index;
469
470 /* HT rate format, MIMO (might be 20 MHz legacy or 40 MHz fat width) */
471 } else {
472 tbl->lq_type = LQ_MIMO;
473 if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK)
474 tbl->is_SGI = 1;
475
476 if ((mcs_rate->rate_n_flags & RATE_MCS_FAT_MSK) ||
477 (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK))
478 tbl->is_fat = 1;
479
480 if (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK)
481 tbl->is_dup = 1;
482 *rate_idx = index;
483 }
484 return 0;
485 }
486
487 static inline void rs_toggle_antenna(struct iwl4965_rate *new_rate,
488 struct iwl4965_scale_tbl_info *tbl)
489 {
490 if (tbl->antenna_type == ANT_AUX) {
491 tbl->antenna_type = ANT_MAIN;
492 new_rate->rate_n_flags &= ~RATE_MCS_ANT_B_MSK;
493 new_rate->rate_n_flags |= RATE_MCS_ANT_A_MSK;
494 } else {
495 tbl->antenna_type = ANT_AUX;
496 new_rate->rate_n_flags &= ~RATE_MCS_ANT_A_MSK;
497 new_rate->rate_n_flags |= RATE_MCS_ANT_B_MSK;
498 }
499 }
500
501 static inline u8 rs_use_green(struct iwl4965_priv *priv,
502 struct ieee80211_conf *conf)
503 {
504 #ifdef CONFIG_IWL4965_HT
505 return ((conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) &&
506 priv->current_ht_config.is_green_field &&
507 !priv->current_ht_config.non_GF_STA_present);
508 #endif /* CONFIG_IWL4965_HT */
509 return 0;
510 }
511
512 /**
513 * rs_get_supported_rates - get the available rates
514 *
515 * if management frame or broadcast frame only return
516 * basic available rates.
517 *
518 */
519 static void rs_get_supported_rates(struct iwl4965_lq_sta *lq_sta,
520 struct ieee80211_hdr *hdr,
521 enum iwl4965_table_type rate_type,
522 u16 *data_rate)
523 {
524 if (is_legacy(rate_type))
525 *data_rate = lq_sta->active_rate;
526 else {
527 if (is_siso(rate_type))
528 *data_rate = lq_sta->active_siso_rate;
529 else
530 *data_rate = lq_sta->active_mimo_rate;
531 }
532
533 if (hdr && is_multicast_ether_addr(hdr->addr1) &&
534 lq_sta->active_rate_basic) {
535 *data_rate = lq_sta->active_rate_basic;
536 }
537 }
538
539 static u16 rs_get_adjacent_rate(u8 index, u16 rate_mask, int rate_type)
540 {
541 u8 high = IWL_RATE_INVALID;
542 u8 low = IWL_RATE_INVALID;
543
544 /* 802.11A or ht walks to the next literal adjacent rate in
545 * the rate table */
546 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
547 int i;
548 u32 mask;
549
550 /* Find the previous rate that is in the rate mask */
551 i = index - 1;
552 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
553 if (rate_mask & mask) {
554 low = i;
555 break;
556 }
557 }
558
559 /* Find the next rate that is in the rate mask */
560 i = index + 1;
561 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
562 if (rate_mask & mask) {
563 high = i;
564 break;
565 }
566 }
567
568 return (high << 8) | low;
569 }
570
571 low = index;
572 while (low != IWL_RATE_INVALID) {
573 low = iwl4965_rates[low].prev_rs;
574 if (low == IWL_RATE_INVALID)
575 break;
576 if (rate_mask & (1 << low))
577 break;
578 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
579 }
580
581 high = index;
582 while (high != IWL_RATE_INVALID) {
583 high = iwl4965_rates[high].next_rs;
584 if (high == IWL_RATE_INVALID)
585 break;
586 if (rate_mask & (1 << high))
587 break;
588 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
589 }
590
591 return (high << 8) | low;
592 }
593
594 static void rs_get_lower_rate(struct iwl4965_lq_sta *lq_sta,
595 struct iwl4965_scale_tbl_info *tbl, u8 scale_index,
596 u8 ht_possible, struct iwl4965_rate *mcs_rate)
597 {
598 s32 low;
599 u16 rate_mask;
600 u16 high_low;
601 u8 switch_to_legacy = 0;
602 u8 is_green = lq_sta->is_green;
603
604 /* check if we need to switch from HT to legacy rates.
605 * assumption is that mandatory rates (1Mbps or 6Mbps)
606 * are always supported (spec demand) */
607 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
608 switch_to_legacy = 1;
609 scale_index = rs_ht_to_legacy[scale_index];
610 if (lq_sta->phymode == MODE_IEEE80211A)
611 tbl->lq_type = LQ_A;
612 else
613 tbl->lq_type = LQ_G;
614
615 if ((tbl->antenna_type == ANT_BOTH) ||
616 (tbl->antenna_type == ANT_NONE))
617 tbl->antenna_type = ANT_MAIN;
618
619 tbl->is_fat = 0;
620 tbl->is_SGI = 0;
621 }
622
623 rs_get_supported_rates(lq_sta, NULL, tbl->lq_type, &rate_mask);
624
625 /* Mask with station rate restriction */
626 if (is_legacy(tbl->lq_type)) {
627 /* supp_rates has no CCK bits in A mode */
628 if (lq_sta->phymode == (u8) MODE_IEEE80211A)
629 rate_mask = (u16)(rate_mask &
630 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
631 else
632 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
633 }
634
635 /* If we switched from HT to legacy, check current rate */
636 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
637 rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green);
638 return;
639 }
640
641 high_low = rs_get_adjacent_rate(scale_index, rate_mask, tbl->lq_type);
642 low = high_low & 0xff;
643
644 if (low != IWL_RATE_INVALID)
645 rs_mcs_from_tbl(mcs_rate, tbl, low, is_green);
646 else
647 rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green);
648 }
649
650 /*
651 * mac80211 sends us Tx status
652 */
653 static void rs_tx_status(void *priv_rate, struct net_device *dev,
654 struct sk_buff *skb,
655 struct ieee80211_tx_status *tx_resp)
656 {
657 int status;
658 u8 retries;
659 int rs_index, index = 0;
660 struct iwl4965_lq_sta *lq_sta;
661 struct iwl4965_link_quality_cmd *table;
662 struct sta_info *sta;
663 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
664 struct iwl4965_priv *priv = (struct iwl4965_priv *)priv_rate;
665 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
666 struct iwl4965_rate_scale_data *window = NULL;
667 struct iwl4965_rate_scale_data *search_win = NULL;
668 struct iwl4965_rate tx_mcs;
669 struct iwl4965_scale_tbl_info tbl_type;
670 struct iwl4965_scale_tbl_info *curr_tbl, *search_tbl;
671 u8 active_index = 0;
672 u16 fc = le16_to_cpu(hdr->frame_control);
673 s32 tpt = 0;
674
675 IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
676
677 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1))
678 return;
679
680 retries = tx_resp->retry_count;
681
682 if (retries > 15)
683 retries = 15;
684
685
686 sta = sta_info_get(local, hdr->addr1);
687
688 if (!sta || !sta->rate_ctrl_priv) {
689 if (sta)
690 sta_info_put(sta);
691 return;
692 }
693
694 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
695
696 if (!priv->lq_mngr.lq_ready)
697 return;
698
699 if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
700 !lq_sta->ibss_sta_added)
701 return;
702
703 table = &lq_sta->lq;
704 active_index = lq_sta->active_tbl;
705
706 /* Get mac80211 antenna info */
707 lq_sta->antenna =
708 (lq_sta->valid_antenna & local->hw.conf.antenna_sel_tx);
709 if (!lq_sta->antenna)
710 lq_sta->antenna = lq_sta->valid_antenna;
711
712 /* Ignore mac80211 antenna info for now */
713 lq_sta->antenna = lq_sta->valid_antenna;
714
715 curr_tbl = &(lq_sta->lq_info[active_index]);
716 search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
717 window = (struct iwl4965_rate_scale_data *)
718 &(curr_tbl->win[0]);
719 search_win = (struct iwl4965_rate_scale_data *)
720 &(search_tbl->win[0]);
721
722 tx_mcs.rate_n_flags = tx_resp->control.tx_rate;
723
724 rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode,
725 &tbl_type, &rs_index);
726 if ((rs_index < 0) || (rs_index >= IWL_RATE_COUNT)) {
727 IWL_DEBUG_RATE("bad rate index at: %d rate 0x%X\n",
728 rs_index, tx_mcs.rate_n_flags);
729 sta_info_put(sta);
730 return;
731 }
732
733 /*
734 * Ignore this Tx frame response if its initial rate doesn't match
735 * that of latest Link Quality command. There may be stragglers
736 * from a previous Link Quality command, but we're no longer interested
737 * in those; they're either from the "active" mode while we're trying
738 * to check "search" mode, or a prior "search" mode after we've moved
739 * to a new "search" mode (which might become the new "active" mode).
740 */
741 if (retries &&
742 (tx_mcs.rate_n_flags !=
743 le32_to_cpu(table->rs_table[0].rate_n_flags))) {
744 IWL_DEBUG_RATE("initial rate does not match 0x%x 0x%x\n",
745 tx_mcs.rate_n_flags,
746 le32_to_cpu(table->rs_table[0].rate_n_flags));
747 sta_info_put(sta);
748 return;
749 }
750
751 /* Update frame history window with "failure" for each Tx retry. */
752 while (retries) {
753 /* Look up the rate and other info used for each tx attempt.
754 * Each tx attempt steps one entry deeper in the rate table. */
755 tx_mcs.rate_n_flags =
756 le32_to_cpu(table->rs_table[index].rate_n_flags);
757 rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode,
758 &tbl_type, &rs_index);
759
760 /* If type matches "search" table,
761 * add failure to "search" history */
762 if ((tbl_type.lq_type == search_tbl->lq_type) &&
763 (tbl_type.antenna_type == search_tbl->antenna_type) &&
764 (tbl_type.is_SGI == search_tbl->is_SGI)) {
765 if (search_tbl->expected_tpt)
766 tpt = search_tbl->expected_tpt[rs_index];
767 else
768 tpt = 0;
769 rs_collect_tx_data(search_win, rs_index, tpt, 0);
770
771 /* Else if type matches "current/active" table,
772 * add failure to "current/active" history */
773 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
774 (tbl_type.antenna_type == curr_tbl->antenna_type) &&
775 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
776 if (curr_tbl->expected_tpt)
777 tpt = curr_tbl->expected_tpt[rs_index];
778 else
779 tpt = 0;
780 rs_collect_tx_data(window, rs_index, tpt, 0);
781 }
782
783 /* If not searching for a new mode, increment failed counter
784 * ... this helps determine when to start searching again */
785 if (lq_sta->stay_in_tbl)
786 lq_sta->total_failed++;
787 --retries;
788 index++;
789
790 }
791
792 /*
793 * Find (by rate) the history window to update with final Tx attempt;
794 * if Tx was successful first try, use original rate,
795 * else look up the rate that was, finally, successful.
796 */
797 if (!tx_resp->retry_count)
798 tx_mcs.rate_n_flags = tx_resp->control.tx_rate;
799 else
800 tx_mcs.rate_n_flags =
801 le32_to_cpu(table->rs_table[index].rate_n_flags);
802
803 rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode,
804 &tbl_type, &rs_index);
805
806 /* Update frame history window with "success" if Tx got ACKed ... */
807 if (tx_resp->flags & IEEE80211_TX_STATUS_ACK)
808 status = 1;
809 else
810 status = 0;
811
812 /* If type matches "search" table,
813 * add final tx status to "search" history */
814 if ((tbl_type.lq_type == search_tbl->lq_type) &&
815 (tbl_type.antenna_type == search_tbl->antenna_type) &&
816 (tbl_type.is_SGI == search_tbl->is_SGI)) {
817 if (search_tbl->expected_tpt)
818 tpt = search_tbl->expected_tpt[rs_index];
819 else
820 tpt = 0;
821 rs_collect_tx_data(search_win,
822 rs_index, tpt, status);
823
824 /* Else if type matches "current/active" table,
825 * add final tx status to "current/active" history */
826 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
827 (tbl_type.antenna_type == curr_tbl->antenna_type) &&
828 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
829 if (curr_tbl->expected_tpt)
830 tpt = curr_tbl->expected_tpt[rs_index];
831 else
832 tpt = 0;
833 rs_collect_tx_data(window, rs_index, tpt, status);
834 }
835
836 /* If not searching for new mode, increment success/failed counter
837 * ... these help determine when to start searching again */
838 if (lq_sta->stay_in_tbl) {
839 if (status)
840 lq_sta->total_success++;
841 else
842 lq_sta->total_failed++;
843 }
844
845 /* See if there's a better rate or modulation mode to try. */
846 rs_rate_scale_perform(priv, dev, hdr, sta);
847 sta_info_put(sta);
848 return;
849 }
850
851 static u8 rs_is_ant_connected(u8 valid_antenna,
852 enum iwl4965_antenna_type antenna_type)
853 {
854 if (antenna_type == ANT_AUX)
855 return ((valid_antenna & 0x2) ? 1:0);
856 else if (antenna_type == ANT_MAIN)
857 return ((valid_antenna & 0x1) ? 1:0);
858 else if (antenna_type == ANT_BOTH)
859 return ((valid_antenna & 0x3) == 0x3);
860
861 return 1;
862 }
863
864 static u8 rs_is_other_ant_connected(u8 valid_antenna,
865 enum iwl4965_antenna_type antenna_type)
866 {
867 if (antenna_type == ANT_AUX)
868 return rs_is_ant_connected(valid_antenna, ANT_MAIN);
869 else
870 return rs_is_ant_connected(valid_antenna, ANT_AUX);
871
872 return 0;
873 }
874
875 /*
876 * Begin a period of staying with a selected modulation mode.
877 * Set "stay_in_tbl" flag to prevent any mode switches.
878 * Set frame tx success limits according to legacy vs. high-throughput,
879 * and reset overall (spanning all rates) tx success history statistics.
880 * These control how long we stay using same modulation mode before
881 * searching for a new mode.
882 */
883 static void rs_set_stay_in_table(u8 is_legacy,
884 struct iwl4965_lq_sta *lq_sta)
885 {
886 IWL_DEBUG_HT("we are staying in the same table\n");
887 lq_sta->stay_in_tbl = 1; /* only place this gets set */
888 if (is_legacy) {
889 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
890 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
891 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
892 } else {
893 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
894 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
895 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
896 }
897 lq_sta->table_count = 0;
898 lq_sta->total_failed = 0;
899 lq_sta->total_success = 0;
900 }
901
902 /*
903 * Find correct throughput table for given mode of modulation
904 */
905 static void rs_get_expected_tpt_table(struct iwl4965_lq_sta *lq_sta,
906 struct iwl4965_scale_tbl_info *tbl)
907 {
908 if (is_legacy(tbl->lq_type)) {
909 if (!is_a_band(tbl->lq_type))
910 tbl->expected_tpt = expected_tpt_G;
911 else
912 tbl->expected_tpt = expected_tpt_A;
913 } else if (is_siso(tbl->lq_type)) {
914 if (tbl->is_fat && !lq_sta->is_dup)
915 if (tbl->is_SGI)
916 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
917 else
918 tbl->expected_tpt = expected_tpt_siso40MHz;
919 else if (tbl->is_SGI)
920 tbl->expected_tpt = expected_tpt_siso20MHzSGI;
921 else
922 tbl->expected_tpt = expected_tpt_siso20MHz;
923
924 } else if (is_mimo(tbl->lq_type)) {
925 if (tbl->is_fat && !lq_sta->is_dup)
926 if (tbl->is_SGI)
927 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
928 else
929 tbl->expected_tpt = expected_tpt_mimo40MHz;
930 else if (tbl->is_SGI)
931 tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
932 else
933 tbl->expected_tpt = expected_tpt_mimo20MHz;
934 } else
935 tbl->expected_tpt = expected_tpt_G;
936 }
937
938 #ifdef CONFIG_IWL4965_HT
939 /*
940 * Find starting rate for new "search" high-throughput mode of modulation.
941 * Goal is to find lowest expected rate (under perfect conditions) that is
942 * above the current measured throughput of "active" mode, to give new mode
943 * a fair chance to prove itself without too many challenges.
944 *
945 * This gets called when transitioning to more aggressive modulation
946 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
947 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
948 * to decrease to match "active" throughput. When moving from MIMO to SISO,
949 * bit rate will typically need to increase, but not if performance was bad.
950 */
951 static s32 rs_get_best_rate(struct iwl4965_priv *priv,
952 struct iwl4965_lq_sta *lq_sta,
953 struct iwl4965_scale_tbl_info *tbl, /* "search" */
954 u16 rate_mask, s8 index, s8 rate)
955 {
956 /* "active" values */
957 struct iwl4965_scale_tbl_info *active_tbl =
958 &(lq_sta->lq_info[lq_sta->active_tbl]);
959 s32 active_sr = active_tbl->win[index].success_ratio;
960 s32 active_tpt = active_tbl->expected_tpt[index];
961
962 /* expected "search" throughput */
963 s32 *tpt_tbl = tbl->expected_tpt;
964
965 s32 new_rate, high, low, start_hi;
966 u16 high_low;
967
968 new_rate = high = low = start_hi = IWL_RATE_INVALID;
969
970 for (; ;) {
971 high_low = rs_get_adjacent_rate(rate, rate_mask, tbl->lq_type);
972
973 low = high_low & 0xff;
974 high = (high_low >> 8) & 0xff;
975
976 /*
977 * Lower the "search" bit rate, to give new "search" mode
978 * approximately the same throughput as "active" if:
979 *
980 * 1) "Active" mode has been working modestly well (but not
981 * great), and expected "search" throughput (under perfect
982 * conditions) at candidate rate is above the actual
983 * measured "active" throughput (but less than expected
984 * "active" throughput under perfect conditions).
985 * OR
986 * 2) "Active" mode has been working perfectly or very well
987 * and expected "search" throughput (under perfect
988 * conditions) at candidate rate is above expected
989 * "active" throughput (under perfect conditions).
990 */
991 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
992 ((active_sr > IWL_RATE_DECREASE_TH) &&
993 (active_sr <= IWL_RATE_HIGH_TH) &&
994 (tpt_tbl[rate] <= active_tpt))) ||
995 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
996 (tpt_tbl[rate] > active_tpt))) {
997
998 /* (2nd or later pass)
999 * If we've already tried to raise the rate, and are
1000 * now trying to lower it, use the higher rate. */
1001 if (start_hi != IWL_RATE_INVALID) {
1002 new_rate = start_hi;
1003 break;
1004 }
1005
1006 new_rate = rate;
1007
1008 /* Loop again with lower rate */
1009 if (low != IWL_RATE_INVALID)
1010 rate = low;
1011
1012 /* Lower rate not available, use the original */
1013 else
1014 break;
1015
1016 /* Else try to raise the "search" rate to match "active" */
1017 } else {
1018 /* (2nd or later pass)
1019 * If we've already tried to lower the rate, and are
1020 * now trying to raise it, use the lower rate. */
1021 if (new_rate != IWL_RATE_INVALID)
1022 break;
1023
1024 /* Loop again with higher rate */
1025 else if (high != IWL_RATE_INVALID) {
1026 start_hi = high;
1027 rate = high;
1028
1029 /* Higher rate not available, use the original */
1030 } else {
1031 new_rate = rate;
1032 break;
1033 }
1034 }
1035 }
1036
1037 return new_rate;
1038 }
1039 #endif /* CONFIG_IWL4965_HT */
1040
1041 static inline u8 rs_is_both_ant_supp(u8 valid_antenna)
1042 {
1043 return (rs_is_ant_connected(valid_antenna, ANT_BOTH));
1044 }
1045
1046 /*
1047 * Set up search table for MIMO
1048 */
1049 static int rs_switch_to_mimo(struct iwl4965_priv *priv,
1050 struct iwl4965_lq_sta *lq_sta,
1051 struct ieee80211_conf *conf,
1052 struct sta_info *sta,
1053 struct iwl4965_scale_tbl_info *tbl, int index)
1054 {
1055 #ifdef CONFIG_IWL4965_HT
1056 u16 rate_mask;
1057 s32 rate;
1058 s8 is_green = lq_sta->is_green;
1059
1060 if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1061 !sta->ht_info.ht_supported)
1062 return -1;
1063
1064 IWL_DEBUG_HT("LQ: try to switch to MIMO\n");
1065 tbl->lq_type = LQ_MIMO;
1066 rs_get_supported_rates(lq_sta, NULL, tbl->lq_type,
1067 &rate_mask);
1068
1069 if (priv->current_ht_config.tx_mimo_ps_mode == IWL_MIMO_PS_STATIC)
1070 return -1;
1071
1072 /* Need both Tx chains/antennas to support MIMO */
1073 if (!rs_is_both_ant_supp(lq_sta->antenna))
1074 return -1;
1075
1076 tbl->is_dup = lq_sta->is_dup;
1077 tbl->action = 0;
1078 if (priv->current_ht_config.supported_chan_width
1079 == IWL_CHANNEL_WIDTH_40MHZ)
1080 tbl->is_fat = 1;
1081 else
1082 tbl->is_fat = 0;
1083
1084 if (tbl->is_fat) {
1085 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1086 tbl->is_SGI = 1;
1087 else
1088 tbl->is_SGI = 0;
1089 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1090 tbl->is_SGI = 1;
1091 else
1092 tbl->is_SGI = 0;
1093
1094 rs_get_expected_tpt_table(lq_sta, tbl);
1095
1096 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index, index);
1097
1098 IWL_DEBUG_HT("LQ: MIMO best rate %d mask %X\n", rate, rate_mask);
1099 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask))
1100 return -1;
1101 rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green);
1102
1103 IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
1104 tbl->current_rate.rate_n_flags, is_green);
1105 return 0;
1106 #else
1107 return -1;
1108 #endif /*CONFIG_IWL4965_HT */
1109 }
1110
1111 /*
1112 * Set up search table for SISO
1113 */
1114 static int rs_switch_to_siso(struct iwl4965_priv *priv,
1115 struct iwl4965_lq_sta *lq_sta,
1116 struct ieee80211_conf *conf,
1117 struct sta_info *sta,
1118 struct iwl4965_scale_tbl_info *tbl, int index)
1119 {
1120 #ifdef CONFIG_IWL4965_HT
1121 u16 rate_mask;
1122 u8 is_green = lq_sta->is_green;
1123 s32 rate;
1124
1125 IWL_DEBUG_HT("LQ: try to switch to SISO\n");
1126 if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1127 !sta->ht_info.ht_supported)
1128 return -1;
1129
1130 tbl->is_dup = lq_sta->is_dup;
1131 tbl->lq_type = LQ_SISO;
1132 tbl->action = 0;
1133 rs_get_supported_rates(lq_sta, NULL, tbl->lq_type,
1134 &rate_mask);
1135
1136 if (priv->current_ht_config.supported_chan_width
1137 == IWL_CHANNEL_WIDTH_40MHZ)
1138 tbl->is_fat = 1;
1139 else
1140 tbl->is_fat = 0;
1141
1142 if (tbl->is_fat) {
1143 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1144 tbl->is_SGI = 1;
1145 else
1146 tbl->is_SGI = 0;
1147 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1148 tbl->is_SGI = 1;
1149 else
1150 tbl->is_SGI = 0;
1151
1152 if (is_green)
1153 tbl->is_SGI = 0;
1154
1155 rs_get_expected_tpt_table(lq_sta, tbl);
1156 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index, index);
1157
1158 IWL_DEBUG_HT("LQ: get best rate %d mask %X\n", rate, rate_mask);
1159 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1160 IWL_DEBUG_HT("can not switch with index %d rate mask %x\n",
1161 rate, rate_mask);
1162 return -1;
1163 }
1164 rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green);
1165 IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
1166 tbl->current_rate.rate_n_flags, is_green);
1167 return 0;
1168 #else
1169 return -1;
1170
1171 #endif /*CONFIG_IWL4965_HT */
1172 }
1173
1174 /*
1175 * Try to switch to new modulation mode from legacy
1176 */
1177 static int rs_move_legacy_other(struct iwl4965_priv *priv,
1178 struct iwl4965_lq_sta *lq_sta,
1179 struct ieee80211_conf *conf,
1180 struct sta_info *sta,
1181 int index)
1182 {
1183 int ret = 0;
1184 struct iwl4965_scale_tbl_info *tbl =
1185 &(lq_sta->lq_info[lq_sta->active_tbl]);
1186 struct iwl4965_scale_tbl_info *search_tbl =
1187 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1188 struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1189 u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1190 (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1191 u8 start_action = tbl->action;
1192
1193 for (; ;) {
1194 switch (tbl->action) {
1195 case IWL_LEGACY_SWITCH_ANTENNA:
1196 IWL_DEBUG_HT("LQ Legacy switch Antenna\n");
1197
1198 search_tbl->lq_type = LQ_NONE;
1199 lq_sta->action_counter++;
1200
1201 /* Don't change antenna if success has been great */
1202 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1203 break;
1204
1205 /* Don't change antenna if other one is not connected */
1206 if (!rs_is_other_ant_connected(lq_sta->antenna,
1207 tbl->antenna_type))
1208 break;
1209
1210 /* Set up search table to try other antenna */
1211 memcpy(search_tbl, tbl, sz);
1212
1213 rs_toggle_antenna(&(search_tbl->current_rate),
1214 search_tbl);
1215 rs_get_expected_tpt_table(lq_sta, search_tbl);
1216 lq_sta->search_better_tbl = 1;
1217 goto out;
1218
1219 case IWL_LEGACY_SWITCH_SISO:
1220 IWL_DEBUG_HT("LQ: Legacy switch to SISO\n");
1221
1222 /* Set up search table to try SISO */
1223 memcpy(search_tbl, tbl, sz);
1224 search_tbl->lq_type = LQ_SISO;
1225 search_tbl->is_SGI = 0;
1226 search_tbl->is_fat = 0;
1227 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1228 search_tbl, index);
1229 if (!ret) {
1230 lq_sta->search_better_tbl = 1;
1231 lq_sta->action_counter = 0;
1232 goto out;
1233 }
1234
1235 break;
1236 case IWL_LEGACY_SWITCH_MIMO:
1237 IWL_DEBUG_HT("LQ: Legacy switch MIMO\n");
1238
1239 /* Set up search table to try MIMO */
1240 memcpy(search_tbl, tbl, sz);
1241 search_tbl->lq_type = LQ_MIMO;
1242 search_tbl->is_SGI = 0;
1243 search_tbl->is_fat = 0;
1244 search_tbl->antenna_type = ANT_BOTH;
1245 ret = rs_switch_to_mimo(priv, lq_sta, conf, sta,
1246 search_tbl, index);
1247 if (!ret) {
1248 lq_sta->search_better_tbl = 1;
1249 lq_sta->action_counter = 0;
1250 goto out;
1251 }
1252 break;
1253 }
1254 tbl->action++;
1255 if (tbl->action > IWL_LEGACY_SWITCH_MIMO)
1256 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1257
1258 if (tbl->action == start_action)
1259 break;
1260
1261 }
1262 return 0;
1263
1264 out:
1265 tbl->action++;
1266 if (tbl->action > IWL_LEGACY_SWITCH_MIMO)
1267 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1268 return 0;
1269
1270 }
1271
1272 /*
1273 * Try to switch to new modulation mode from SISO
1274 */
1275 static int rs_move_siso_to_other(struct iwl4965_priv *priv,
1276 struct iwl4965_lq_sta *lq_sta,
1277 struct ieee80211_conf *conf,
1278 struct sta_info *sta,
1279 int index)
1280 {
1281 int ret;
1282 u8 is_green = lq_sta->is_green;
1283 struct iwl4965_scale_tbl_info *tbl =
1284 &(lq_sta->lq_info[lq_sta->active_tbl]);
1285 struct iwl4965_scale_tbl_info *search_tbl =
1286 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1287 struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1288 u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1289 (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1290 u8 start_action = tbl->action;
1291
1292 for (;;) {
1293 lq_sta->action_counter++;
1294 switch (tbl->action) {
1295 case IWL_SISO_SWITCH_ANTENNA:
1296 IWL_DEBUG_HT("LQ: SISO SWITCH ANTENNA SISO\n");
1297 search_tbl->lq_type = LQ_NONE;
1298 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1299 break;
1300 if (!rs_is_other_ant_connected(lq_sta->antenna,
1301 tbl->antenna_type))
1302 break;
1303
1304 memcpy(search_tbl, tbl, sz);
1305 search_tbl->action = IWL_SISO_SWITCH_MIMO;
1306 rs_toggle_antenna(&(search_tbl->current_rate),
1307 search_tbl);
1308 lq_sta->search_better_tbl = 1;
1309
1310 goto out;
1311
1312 case IWL_SISO_SWITCH_MIMO:
1313 IWL_DEBUG_HT("LQ: SISO SWITCH TO MIMO FROM SISO\n");
1314 memcpy(search_tbl, tbl, sz);
1315 search_tbl->lq_type = LQ_MIMO;
1316 search_tbl->is_SGI = 0;
1317 search_tbl->is_fat = 0;
1318 search_tbl->antenna_type = ANT_BOTH;
1319 ret = rs_switch_to_mimo(priv, lq_sta, conf, sta,
1320 search_tbl, index);
1321 if (!ret) {
1322 lq_sta->search_better_tbl = 1;
1323 goto out;
1324 }
1325 break;
1326 case IWL_SISO_SWITCH_GI:
1327 IWL_DEBUG_HT("LQ: SISO SWITCH TO GI\n");
1328 memcpy(search_tbl, tbl, sz);
1329 search_tbl->action = 0;
1330 if (search_tbl->is_SGI)
1331 search_tbl->is_SGI = 0;
1332 else if (!is_green)
1333 search_tbl->is_SGI = 1;
1334 else
1335 break;
1336 lq_sta->search_better_tbl = 1;
1337 if ((tbl->lq_type == LQ_SISO) &&
1338 (tbl->is_SGI)) {
1339 s32 tpt = lq_sta->last_tpt / 100;
1340 if (((!tbl->is_fat) &&
1341 (tpt >= expected_tpt_siso20MHz[index])) ||
1342 ((tbl->is_fat) &&
1343 (tpt >= expected_tpt_siso40MHz[index])))
1344 lq_sta->search_better_tbl = 0;
1345 }
1346 rs_get_expected_tpt_table(lq_sta, search_tbl);
1347 rs_mcs_from_tbl(&search_tbl->current_rate,
1348 search_tbl, index, is_green);
1349 goto out;
1350 }
1351 tbl->action++;
1352 if (tbl->action > IWL_SISO_SWITCH_GI)
1353 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1354
1355 if (tbl->action == start_action)
1356 break;
1357 }
1358 return 0;
1359
1360 out:
1361 tbl->action++;
1362 if (tbl->action > IWL_SISO_SWITCH_GI)
1363 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1364 return 0;
1365 }
1366
1367 /*
1368 * Try to switch to new modulation mode from MIMO
1369 */
1370 static int rs_move_mimo_to_other(struct iwl4965_priv *priv,
1371 struct iwl4965_lq_sta *lq_sta,
1372 struct ieee80211_conf *conf,
1373 struct sta_info *sta,
1374 int index)
1375 {
1376 int ret;
1377 s8 is_green = lq_sta->is_green;
1378 struct iwl4965_scale_tbl_info *tbl =
1379 &(lq_sta->lq_info[lq_sta->active_tbl]);
1380 struct iwl4965_scale_tbl_info *search_tbl =
1381 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1382 u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1383 (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1384 u8 start_action = tbl->action;
1385
1386 for (;;) {
1387 lq_sta->action_counter++;
1388 switch (tbl->action) {
1389 case IWL_MIMO_SWITCH_ANTENNA_A:
1390 case IWL_MIMO_SWITCH_ANTENNA_B:
1391 IWL_DEBUG_HT("LQ: MIMO SWITCH TO SISO\n");
1392
1393 /* Set up new search table for SISO */
1394 memcpy(search_tbl, tbl, sz);
1395 search_tbl->lq_type = LQ_SISO;
1396 search_tbl->is_SGI = 0;
1397 search_tbl->is_fat = 0;
1398 if (tbl->action == IWL_MIMO_SWITCH_ANTENNA_A)
1399 search_tbl->antenna_type = ANT_MAIN;
1400 else
1401 search_tbl->antenna_type = ANT_AUX;
1402
1403 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1404 search_tbl, index);
1405 if (!ret) {
1406 lq_sta->search_better_tbl = 1;
1407 goto out;
1408 }
1409 break;
1410
1411 case IWL_MIMO_SWITCH_GI:
1412 IWL_DEBUG_HT("LQ: MIMO SWITCH TO GI\n");
1413
1414 /* Set up new search table for MIMO */
1415 memcpy(search_tbl, tbl, sz);
1416 search_tbl->lq_type = LQ_MIMO;
1417 search_tbl->antenna_type = ANT_BOTH;
1418 search_tbl->action = 0;
1419 if (search_tbl->is_SGI)
1420 search_tbl->is_SGI = 0;
1421 else
1422 search_tbl->is_SGI = 1;
1423 lq_sta->search_better_tbl = 1;
1424
1425 /*
1426 * If active table already uses the fastest possible
1427 * modulation (dual stream with short guard interval),
1428 * and it's working well, there's no need to look
1429 * for a better type of modulation!
1430 */
1431 if ((tbl->lq_type == LQ_MIMO) &&
1432 (tbl->is_SGI)) {
1433 s32 tpt = lq_sta->last_tpt / 100;
1434 if (((!tbl->is_fat) &&
1435 (tpt >= expected_tpt_mimo20MHz[index])) ||
1436 ((tbl->is_fat) &&
1437 (tpt >= expected_tpt_mimo40MHz[index])))
1438 lq_sta->search_better_tbl = 0;
1439 }
1440 rs_get_expected_tpt_table(lq_sta, search_tbl);
1441 rs_mcs_from_tbl(&search_tbl->current_rate,
1442 search_tbl, index, is_green);
1443 goto out;
1444
1445 }
1446 tbl->action++;
1447 if (tbl->action > IWL_MIMO_SWITCH_GI)
1448 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1449
1450 if (tbl->action == start_action)
1451 break;
1452 }
1453
1454 return 0;
1455 out:
1456 tbl->action++;
1457 if (tbl->action > IWL_MIMO_SWITCH_GI)
1458 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1459 return 0;
1460
1461 }
1462
1463 /*
1464 * Check whether we should continue using same modulation mode, or
1465 * begin search for a new mode, based on:
1466 * 1) # tx successes or failures while using this mode
1467 * 2) # times calling this function
1468 * 3) elapsed time in this mode (not used, for now)
1469 */
1470 static void rs_stay_in_table(struct iwl4965_lq_sta *lq_sta)
1471 {
1472 struct iwl4965_scale_tbl_info *tbl;
1473 int i;
1474 int active_tbl;
1475 int flush_interval_passed = 0;
1476
1477 active_tbl = lq_sta->active_tbl;
1478
1479 tbl = &(lq_sta->lq_info[active_tbl]);
1480
1481 /* If we've been disallowing search, see if we should now allow it */
1482 if (lq_sta->stay_in_tbl) {
1483
1484 /* Elapsed time using current modulation mode */
1485 if (lq_sta->flush_timer)
1486 flush_interval_passed =
1487 time_after(jiffies,
1488 (unsigned long)(lq_sta->flush_timer +
1489 IWL_RATE_SCALE_FLUSH_INTVL));
1490
1491 /* For now, disable the elapsed time criterion */
1492 flush_interval_passed = 0;
1493
1494 /*
1495 * Check if we should allow search for new modulation mode.
1496 * If many frames have failed or succeeded, or we've used
1497 * this same modulation for a long time, allow search, and
1498 * reset history stats that keep track of whether we should
1499 * allow a new search. Also (below) reset all bitmaps and
1500 * stats in active history.
1501 */
1502 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1503 (lq_sta->total_success > lq_sta->max_success_limit) ||
1504 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1505 && (flush_interval_passed))) {
1506 IWL_DEBUG_HT("LQ: stay is expired %d %d %d\n:",
1507 lq_sta->total_failed,
1508 lq_sta->total_success,
1509 flush_interval_passed);
1510
1511 /* Allow search for new mode */
1512 lq_sta->stay_in_tbl = 0; /* only place reset */
1513 lq_sta->total_failed = 0;
1514 lq_sta->total_success = 0;
1515 lq_sta->flush_timer = 0;
1516
1517 /*
1518 * Else if we've used this modulation mode enough repetitions
1519 * (regardless of elapsed time or success/failure), reset
1520 * history bitmaps and rate-specific stats for all rates in
1521 * active table.
1522 */
1523 } else {
1524 lq_sta->table_count++;
1525 if (lq_sta->table_count >=
1526 lq_sta->table_count_limit) {
1527 lq_sta->table_count = 0;
1528
1529 IWL_DEBUG_HT("LQ: stay in table clear win\n");
1530 for (i = 0; i < IWL_RATE_COUNT; i++)
1531 rs_rate_scale_clear_window(
1532 &(tbl->win[i]));
1533 }
1534 }
1535
1536 /* If transitioning to allow "search", reset all history
1537 * bitmaps and stats in active table (this will become the new
1538 * "search" table). */
1539 if (!lq_sta->stay_in_tbl) {
1540 for (i = 0; i < IWL_RATE_COUNT; i++)
1541 rs_rate_scale_clear_window(&(tbl->win[i]));
1542 }
1543 }
1544 }
1545
1546 /*
1547 * Do rate scaling and search for new modulation mode.
1548 */
1549 static void rs_rate_scale_perform(struct iwl4965_priv *priv,
1550 struct net_device *dev,
1551 struct ieee80211_hdr *hdr,
1552 struct sta_info *sta)
1553 {
1554 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1555 struct ieee80211_hw *hw = local_to_hw(local);
1556 struct ieee80211_conf *conf = &hw->conf;
1557 int low = IWL_RATE_INVALID;
1558 int high = IWL_RATE_INVALID;
1559 int index;
1560 int i;
1561 struct iwl4965_rate_scale_data *window = NULL;
1562 int current_tpt = IWL_INVALID_VALUE;
1563 int low_tpt = IWL_INVALID_VALUE;
1564 int high_tpt = IWL_INVALID_VALUE;
1565 u32 fail_count;
1566 s8 scale_action = 0;
1567 u16 fc, rate_mask;
1568 u8 update_lq = 0;
1569 struct iwl4965_lq_sta *lq_sta;
1570 struct iwl4965_scale_tbl_info *tbl, *tbl1;
1571 u16 rate_scale_index_msk = 0;
1572 struct iwl4965_rate mcs_rate;
1573 u8 is_green = 0;
1574 u8 active_tbl = 0;
1575 u8 done_search = 0;
1576 u16 high_low;
1577
1578 IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1579
1580 fc = le16_to_cpu(hdr->frame_control);
1581 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
1582 /* Send management frames and broadcast/multicast data using
1583 * lowest rate. */
1584 /* TODO: this could probably be improved.. */
1585 return;
1586 }
1587
1588 if (!sta || !sta->rate_ctrl_priv)
1589 return;
1590
1591 if (!priv->lq_mngr.lq_ready) {
1592 IWL_DEBUG_RATE("still rate scaling not ready\n");
1593 return;
1594 }
1595 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
1596
1597 /*
1598 * Select rate-scale / modulation-mode table to work with in
1599 * the rest of this function: "search" if searching for better
1600 * modulation mode, or "active" if doing rate scaling within a mode.
1601 */
1602 if (!lq_sta->search_better_tbl)
1603 active_tbl = lq_sta->active_tbl;
1604 else
1605 active_tbl = 1 - lq_sta->active_tbl;
1606
1607 tbl = &(lq_sta->lq_info[active_tbl]);
1608 is_green = lq_sta->is_green;
1609
1610 /* current tx rate */
1611 index = sta->last_txrate;
1612
1613 IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1614 tbl->lq_type);
1615
1616 /* rates available for this association, and for modulation mode */
1617 rs_get_supported_rates(lq_sta, hdr, tbl->lq_type,
1618 &rate_mask);
1619
1620 IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1621
1622 /* mask with station rate restriction */
1623 if (is_legacy(tbl->lq_type)) {
1624 if (lq_sta->phymode == (u8) MODE_IEEE80211A)
1625 /* supp_rates has no CCK bits in A mode */
1626 rate_scale_index_msk = (u16) (rate_mask &
1627 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1628 else
1629 rate_scale_index_msk = (u16) (rate_mask &
1630 lq_sta->supp_rates);
1631
1632 } else
1633 rate_scale_index_msk = rate_mask;
1634
1635 if (!rate_scale_index_msk)
1636 rate_scale_index_msk = rate_mask;
1637
1638 /* If current rate is no longer supported on current association,
1639 * or user changed preferences for rates, find a new supported rate. */
1640 if (index < 0 || !((1 << index) & rate_scale_index_msk)) {
1641 index = IWL_INVALID_VALUE;
1642 update_lq = 1;
1643
1644 /* get the highest available rate */
1645 for (i = 0; i <= IWL_RATE_COUNT; i++) {
1646 if ((1 << i) & rate_scale_index_msk)
1647 index = i;
1648 }
1649
1650 if (index == IWL_INVALID_VALUE) {
1651 IWL_WARNING("Can not find a suitable rate\n");
1652 return;
1653 }
1654 }
1655
1656 /* Get expected throughput table and history window for current rate */
1657 if (!tbl->expected_tpt)
1658 rs_get_expected_tpt_table(lq_sta, tbl);
1659
1660 window = &(tbl->win[index]);
1661
1662 /*
1663 * If there is not enough history to calculate actual average
1664 * throughput, keep analyzing results of more tx frames, without
1665 * changing rate or mode (bypass most of the rest of this function).
1666 * Set up new rate table in uCode only if old rate is not supported
1667 * in current association (use new rate found above).
1668 */
1669 fail_count = window->counter - window->success_counter;
1670 if (((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1671 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH))
1672 || (tbl->expected_tpt == NULL)) {
1673 IWL_DEBUG_RATE("LQ: still below TH succ %d total %d "
1674 "for index %d\n",
1675 window->success_counter, window->counter, index);
1676
1677 /* Can't calculate this yet; not enough history */
1678 window->average_tpt = IWL_INVALID_VALUE;
1679
1680 /* Should we stay with this modulation mode,
1681 * or search for a new one? */
1682 rs_stay_in_table(lq_sta);
1683
1684 /* Set up new rate table in uCode, if needed */
1685 if (update_lq) {
1686 rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green);
1687 rs_fill_link_cmd(lq_sta, &mcs_rate, &lq_sta->lq);
1688 rs_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1689 }
1690 goto out;
1691
1692 /* Else we have enough samples; calculate estimate of
1693 * actual average throughput */
1694 } else
1695 window->average_tpt = ((window->success_ratio *
1696 tbl->expected_tpt[index] + 64) / 128);
1697
1698 /* If we are searching for better modulation mode, check success. */
1699 if (lq_sta->search_better_tbl) {
1700 int success_limit = IWL_RATE_SCALE_SWITCH;
1701
1702 /* If good success, continue using the "search" mode;
1703 * no need to send new link quality command, since we're
1704 * continuing to use the setup that we've been trying. */
1705 if ((window->success_ratio > success_limit) ||
1706 (window->average_tpt > lq_sta->last_tpt)) {
1707 if (!is_legacy(tbl->lq_type)) {
1708 IWL_DEBUG_HT("LQ: we are switching to HT"
1709 " rate suc %d current tpt %d"
1710 " old tpt %d\n",
1711 window->success_ratio,
1712 window->average_tpt,
1713 lq_sta->last_tpt);
1714 lq_sta->enable_counter = 1;
1715 }
1716 /* Swap tables; "search" becomes "active" */
1717 lq_sta->active_tbl = active_tbl;
1718 current_tpt = window->average_tpt;
1719
1720 /* Else poor success; go back to mode in "active" table */
1721 } else {
1722 /* Nullify "search" table */
1723 tbl->lq_type = LQ_NONE;
1724
1725 /* Revert to "active" table */
1726 active_tbl = lq_sta->active_tbl;
1727 tbl = &(lq_sta->lq_info[active_tbl]);
1728
1729 /* Revert to "active" rate and throughput info */
1730 index = iwl4965_rate_index_from_plcp(
1731 tbl->current_rate.rate_n_flags);
1732 current_tpt = lq_sta->last_tpt;
1733
1734 /* Need to set up a new rate table in uCode */
1735 update_lq = 1;
1736 IWL_DEBUG_HT("XXY GO BACK TO OLD TABLE\n");
1737 }
1738
1739 /* Either way, we've made a decision; modulation mode
1740 * search is done, allow rate adjustment next time. */
1741 lq_sta->search_better_tbl = 0;
1742 done_search = 1; /* Don't switch modes below! */
1743 goto lq_update;
1744 }
1745
1746 /* (Else) not in search of better modulation mode, try for better
1747 * starting rate, while staying in this mode. */
1748 high_low = rs_get_adjacent_rate(index, rate_scale_index_msk,
1749 tbl->lq_type);
1750 low = high_low & 0xff;
1751 high = (high_low >> 8) & 0xff;
1752
1753 /* Collect measured throughputs for current and adjacent rates */
1754 current_tpt = window->average_tpt;
1755 if (low != IWL_RATE_INVALID)
1756 low_tpt = tbl->win[low].average_tpt;
1757 if (high != IWL_RATE_INVALID)
1758 high_tpt = tbl->win[high].average_tpt;
1759
1760 /* Assume rate increase */
1761 scale_action = 1;
1762
1763 /* Too many failures, decrease rate */
1764 if ((window->success_ratio <= IWL_RATE_DECREASE_TH) ||
1765 (current_tpt == 0)) {
1766 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1767 scale_action = -1;
1768
1769 /* No throughput measured yet for adjacent rates; try increase. */
1770 } else if ((low_tpt == IWL_INVALID_VALUE) &&
1771 (high_tpt == IWL_INVALID_VALUE))
1772 scale_action = 1;
1773
1774 /* Both adjacent throughputs are measured, but neither one has better
1775 * throughput; we're using the best rate, don't change it! */
1776 else if ((low_tpt != IWL_INVALID_VALUE) &&
1777 (high_tpt != IWL_INVALID_VALUE) &&
1778 (low_tpt < current_tpt) &&
1779 (high_tpt < current_tpt))
1780 scale_action = 0;
1781
1782 /* At least one adjacent rate's throughput is measured,
1783 * and may have better performance. */
1784 else {
1785 /* Higher adjacent rate's throughput is measured */
1786 if (high_tpt != IWL_INVALID_VALUE) {
1787 /* Higher rate has better throughput */
1788 if (high_tpt > current_tpt)
1789 scale_action = 1;
1790 else {
1791 IWL_DEBUG_RATE
1792 ("decrease rate because of high tpt\n");
1793 scale_action = -1;
1794 }
1795
1796 /* Lower adjacent rate's throughput is measured */
1797 } else if (low_tpt != IWL_INVALID_VALUE) {
1798 /* Lower rate has better throughput */
1799 if (low_tpt > current_tpt) {
1800 IWL_DEBUG_RATE
1801 ("decrease rate because of low tpt\n");
1802 scale_action = -1;
1803 } else
1804 scale_action = 1;
1805 }
1806 }
1807
1808 /* Sanity check; asked for decrease, but success rate or throughput
1809 * has been good at old rate. Don't change it. */
1810 if (scale_action == -1) {
1811 if ((low != IWL_RATE_INVALID) &&
1812 ((window->success_ratio > IWL_RATE_HIGH_TH) ||
1813 (current_tpt > (100 * tbl->expected_tpt[low]))))
1814 scale_action = 0;
1815
1816 /* Sanity check; asked for increase, but success rate has not been great
1817 * even at old rate, higher rate will be worse. Don't change it. */
1818 } else if ((scale_action == 1) &&
1819 (window->success_ratio < IWL_RATE_INCREASE_TH))
1820 scale_action = 0;
1821
1822 switch (scale_action) {
1823 case -1:
1824 /* Decrease starting rate, update uCode's rate table */
1825 if (low != IWL_RATE_INVALID) {
1826 update_lq = 1;
1827 index = low;
1828 }
1829 break;
1830 case 1:
1831 /* Increase starting rate, update uCode's rate table */
1832 if (high != IWL_RATE_INVALID) {
1833 update_lq = 1;
1834 index = high;
1835 }
1836
1837 break;
1838 case 0:
1839 /* No change */
1840 default:
1841 break;
1842 }
1843
1844 IWL_DEBUG_HT("choose rate scale index %d action %d low %d "
1845 "high %d type %d\n",
1846 index, scale_action, low, high, tbl->lq_type);
1847
1848 lq_update:
1849 /* Replace uCode's rate table for the destination station. */
1850 if (update_lq) {
1851 rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green);
1852 rs_fill_link_cmd(lq_sta, &mcs_rate, &lq_sta->lq);
1853 rs_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1854 }
1855
1856 /* Should we stay with this modulation mode, or search for a new one? */
1857 rs_stay_in_table(lq_sta);
1858
1859 /*
1860 * Search for new modulation mode if we're:
1861 * 1) Not changing rates right now
1862 * 2) Not just finishing up a search
1863 * 3) Allowing a new search
1864 */
1865 if (!update_lq && !done_search && !lq_sta->stay_in_tbl) {
1866 /* Save current throughput to compare with "search" throughput*/
1867 lq_sta->last_tpt = current_tpt;
1868
1869 /* Select a new "search" modulation mode to try.
1870 * If one is found, set up the new "search" table. */
1871 if (is_legacy(tbl->lq_type))
1872 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
1873 else if (is_siso(tbl->lq_type))
1874 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
1875 else
1876 rs_move_mimo_to_other(priv, lq_sta, conf, sta, index);
1877
1878 /* If new "search" mode was selected, set up in uCode table */
1879 if (lq_sta->search_better_tbl) {
1880 /* Access the "search" table, clear its history. */
1881 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1882 for (i = 0; i < IWL_RATE_COUNT; i++)
1883 rs_rate_scale_clear_window(&(tbl->win[i]));
1884
1885 /* Use new "search" start rate */
1886 index = iwl4965_rate_index_from_plcp(
1887 tbl->current_rate.rate_n_flags);
1888
1889 IWL_DEBUG_HT("Switch current mcs: %X index: %d\n",
1890 tbl->current_rate.rate_n_flags, index);
1891 rs_fill_link_cmd(lq_sta, &tbl->current_rate,
1892 &lq_sta->lq);
1893 rs_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1894 }
1895
1896 /* If the "active" (non-search) mode was legacy,
1897 * and we've tried switching antennas,
1898 * but we haven't been able to try HT modes (not available),
1899 * stay with best antenna legacy modulation for a while
1900 * before next round of mode comparisons. */
1901 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
1902 if (is_legacy(tbl1->lq_type) &&
1903 #ifdef CONFIG_IWL4965_HT
1904 (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)) &&
1905 #endif
1906 (lq_sta->action_counter >= 1)) {
1907 lq_sta->action_counter = 0;
1908 IWL_DEBUG_HT("LQ: STAY in legacy table\n");
1909 rs_set_stay_in_table(1, lq_sta);
1910 }
1911
1912 /* If we're in an HT mode, and all 3 mode switch actions
1913 * have been tried and compared, stay in this best modulation
1914 * mode for a while before next round of mode comparisons. */
1915 if (lq_sta->enable_counter &&
1916 (lq_sta->action_counter >= IWL_ACTION_LIMIT)) {
1917 #ifdef CONFIG_IWL4965_HT_AGG
1918 /* If appropriate, set up aggregation! */
1919 if ((lq_sta->last_tpt > TID_AGG_TPT_THREHOLD) &&
1920 (priv->lq_mngr.agg_ctrl.auto_agg)) {
1921 priv->lq_mngr.agg_ctrl.tid_retry =
1922 TID_ALL_SPECIFIED;
1923 schedule_work(&priv->agg_work);
1924 }
1925 #endif /*CONFIG_IWL4965_HT_AGG */
1926 lq_sta->action_counter = 0;
1927 rs_set_stay_in_table(0, lq_sta);
1928 }
1929
1930 /*
1931 * Else, don't search for a new modulation mode.
1932 * Put new timestamp in stay-in-modulation-mode flush timer if:
1933 * 1) Not changing rates right now
1934 * 2) Not just finishing up a search
1935 * 3) flush timer is empty
1936 */
1937 } else {
1938 if ((!update_lq) && (!done_search) && (!lq_sta->flush_timer))
1939 lq_sta->flush_timer = jiffies;
1940 }
1941
1942 out:
1943 rs_mcs_from_tbl(&tbl->current_rate, tbl, index, is_green);
1944 i = index;
1945 sta->last_txrate = i;
1946
1947 /* sta->txrate is an index to A mode rates which start
1948 * at IWL_FIRST_OFDM_RATE
1949 */
1950 if (lq_sta->phymode == (u8) MODE_IEEE80211A)
1951 sta->txrate = i - IWL_FIRST_OFDM_RATE;
1952 else
1953 sta->txrate = i;
1954
1955 return;
1956 }
1957
1958
1959 static void rs_initialize_lq(struct iwl4965_priv *priv,
1960 struct ieee80211_conf *conf,
1961 struct sta_info *sta)
1962 {
1963 int i;
1964 struct iwl4965_lq_sta *lq_sta;
1965 struct iwl4965_scale_tbl_info *tbl;
1966 u8 active_tbl = 0;
1967 int rate_idx;
1968 u8 use_green = rs_use_green(priv, conf);
1969 struct iwl4965_rate mcs_rate;
1970
1971 if (!sta || !sta->rate_ctrl_priv)
1972 goto out;
1973
1974 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
1975 i = sta->last_txrate;
1976
1977 if ((lq_sta->lq.sta_id == 0xff) &&
1978 (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
1979 goto out;
1980
1981 if (!lq_sta->search_better_tbl)
1982 active_tbl = lq_sta->active_tbl;
1983 else
1984 active_tbl = 1 - lq_sta->active_tbl;
1985
1986 tbl = &(lq_sta->lq_info[active_tbl]);
1987
1988 if ((i < 0) || (i >= IWL_RATE_COUNT))
1989 i = 0;
1990
1991 mcs_rate.rate_n_flags = iwl4965_rates[i].plcp ;
1992 mcs_rate.rate_n_flags |= RATE_MCS_ANT_B_MSK;
1993 mcs_rate.rate_n_flags &= ~RATE_MCS_ANT_A_MSK;
1994
1995 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
1996 mcs_rate.rate_n_flags |= RATE_MCS_CCK_MSK;
1997
1998 tbl->antenna_type = ANT_AUX;
1999 rs_get_tbl_info_from_mcs(&mcs_rate, priv->phymode, tbl, &rate_idx);
2000 if (!rs_is_ant_connected(priv->valid_antenna, tbl->antenna_type))
2001 rs_toggle_antenna(&mcs_rate, tbl);
2002
2003 rs_mcs_from_tbl(&mcs_rate, tbl, rate_idx, use_green);
2004 tbl->current_rate.rate_n_flags = mcs_rate.rate_n_flags;
2005 rs_get_expected_tpt_table(lq_sta, tbl);
2006 rs_fill_link_cmd(lq_sta, &mcs_rate, &lq_sta->lq);
2007 rs_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2008 out:
2009 return;
2010 }
2011
2012 static void rs_get_rate(void *priv_rate, struct net_device *dev,
2013 struct ieee80211_hw_mode *mode, struct sk_buff *skb,
2014 struct rate_selection *sel)
2015 {
2016
2017 int i;
2018 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2019 struct ieee80211_conf *conf = &local->hw.conf;
2020 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2021 struct sta_info *sta;
2022 u16 fc;
2023 struct iwl4965_priv *priv = (struct iwl4965_priv *)priv_rate;
2024 struct iwl4965_lq_sta *lq_sta;
2025
2026 IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2027
2028 sta = sta_info_get(local, hdr->addr1);
2029
2030 /* Send management frames and broadcast/multicast data using lowest
2031 * rate. */
2032 fc = le16_to_cpu(hdr->frame_control);
2033 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1) ||
2034 !sta || !sta->rate_ctrl_priv) {
2035 sel->rate = rate_lowest(local, local->oper_hw_mode, sta);
2036 if (sta)
2037 sta_info_put(sta);
2038 return;
2039 }
2040
2041 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
2042 i = sta->last_txrate;
2043
2044 if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
2045 !lq_sta->ibss_sta_added) {
2046 u8 sta_id = iwl4965_hw_find_station(priv, hdr->addr1);
2047 DECLARE_MAC_BUF(mac);
2048
2049 if (sta_id == IWL_INVALID_STATION) {
2050 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2051 print_mac(mac, hdr->addr1));
2052 sta_id = iwl4965_add_station_flags(priv, hdr->addr1,
2053 0, CMD_ASYNC, NULL);
2054 }
2055 if ((sta_id != IWL_INVALID_STATION)) {
2056 lq_sta->lq.sta_id = sta_id;
2057 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2058 lq_sta->ibss_sta_added = 1;
2059 rs_initialize_lq(priv, conf, sta);
2060 }
2061 if (!lq_sta->ibss_sta_added)
2062 goto done;
2063 }
2064
2065 done:
2066 if ((i < 0) || (i > IWL_RATE_COUNT)) {
2067 sel->rate = rate_lowest(local, local->oper_hw_mode, sta);
2068 return;
2069 }
2070 sta_info_put(sta);
2071
2072 sel->rate = &priv->ieee_rates[i];
2073 }
2074
2075 static void *rs_alloc_sta(void *priv, gfp_t gfp)
2076 {
2077 struct iwl4965_lq_sta *lq_sta;
2078 int i, j;
2079
2080 IWL_DEBUG_RATE("create station rate scale window\n");
2081
2082 lq_sta = kzalloc(sizeof(struct iwl4965_lq_sta), gfp);
2083
2084 if (lq_sta == NULL)
2085 return NULL;
2086 lq_sta->lq.sta_id = 0xff;
2087
2088
2089 for (j = 0; j < LQ_SIZE; j++)
2090 for (i = 0; i < IWL_RATE_COUNT; i++)
2091 rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
2092
2093 return lq_sta;
2094 }
2095
2096 static void rs_rate_init(void *priv_rate, void *priv_sta,
2097 struct ieee80211_local *local,
2098 struct sta_info *sta)
2099 {
2100 int i, j;
2101 struct ieee80211_conf *conf = &local->hw.conf;
2102 struct ieee80211_hw_mode *mode = local->oper_hw_mode;
2103 struct iwl4965_priv *priv = (struct iwl4965_priv *)priv_rate;
2104 struct iwl4965_lq_sta *lq_sta = priv_sta;
2105
2106 lq_sta->flush_timer = 0;
2107 lq_sta->supp_rates = sta->supp_rates;
2108 sta->txrate = 3;
2109 for (j = 0; j < LQ_SIZE; j++)
2110 for (i = 0; i < IWL_RATE_COUNT; i++)
2111 rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
2112
2113 IWL_DEBUG_RATE("rate scale global init\n");
2114 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2115 * the lowest or the highest rate.. Could consider using RSSI from
2116 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2117 * after assoc.. */
2118
2119 lq_sta->ibss_sta_added = 0;
2120 if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
2121 u8 sta_id = iwl4965_hw_find_station(priv, sta->addr);
2122 DECLARE_MAC_BUF(mac);
2123
2124 /* for IBSS the call are from tasklet */
2125 IWL_DEBUG_HT("LQ: ADD station %s\n",
2126 print_mac(mac, sta->addr));
2127
2128 if (sta_id == IWL_INVALID_STATION) {
2129 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2130 print_mac(mac, sta->addr));
2131 sta_id = iwl4965_add_station_flags(priv, sta->addr,
2132 0, CMD_ASYNC, NULL);
2133 }
2134 if ((sta_id != IWL_INVALID_STATION)) {
2135 lq_sta->lq.sta_id = sta_id;
2136 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2137 }
2138 /* FIXME: this is w/a remove it later */
2139 priv->assoc_station_added = 1;
2140 }
2141
2142 /* Find highest tx rate supported by hardware and destination station */
2143 for (i = 0; i < mode->num_rates; i++) {
2144 if ((sta->supp_rates & BIT(i)) &&
2145 (mode->rates[i].flags & IEEE80211_RATE_SUPPORTED))
2146 sta->txrate = i;
2147 }
2148 sta->last_txrate = sta->txrate;
2149 /* For MODE_IEEE80211A, cck rates are at end of rate table */
2150 if (local->hw.conf.phymode == MODE_IEEE80211A)
2151 sta->last_txrate += IWL_FIRST_OFDM_RATE;
2152
2153 lq_sta->is_dup = 0;
2154 lq_sta->valid_antenna = priv->valid_antenna;
2155 lq_sta->antenna = priv->antenna;
2156 lq_sta->is_green = rs_use_green(priv, conf);
2157 lq_sta->active_rate = priv->active_rate;
2158 lq_sta->active_rate &= ~(0x1000);
2159 lq_sta->active_rate_basic = priv->active_rate_basic;
2160 lq_sta->phymode = priv->phymode;
2161 #ifdef CONFIG_IWL4965_HT
2162 /*
2163 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2164 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2165 */
2166 lq_sta->active_siso_rate = (priv->current_ht_config.supp_mcs_set[0] << 1);
2167 lq_sta->active_siso_rate |=
2168 (priv->current_ht_config.supp_mcs_set[0] & 0x1);
2169 lq_sta->active_siso_rate &= ~((u16)0x2);
2170 lq_sta->active_siso_rate =
2171 lq_sta->active_siso_rate << IWL_FIRST_OFDM_RATE;
2172
2173 /* Same here */
2174 lq_sta->active_mimo_rate = (priv->current_ht_config.supp_mcs_set[1] << 1);
2175 lq_sta->active_mimo_rate |=
2176 (priv->current_ht_config.supp_mcs_set[1] & 0x1);
2177 lq_sta->active_mimo_rate &= ~((u16)0x2);
2178 lq_sta->active_mimo_rate =
2179 lq_sta->active_mimo_rate << IWL_FIRST_OFDM_RATE;
2180 IWL_DEBUG_HT("SISO RATE 0x%X MIMO RATE 0x%X\n",
2181 lq_sta->active_siso_rate,
2182 lq_sta->active_mimo_rate);
2183 #endif /*CONFIG_IWL4965_HT*/
2184 #ifdef CONFIG_MAC80211_DEBUGFS
2185 lq_sta->drv = priv;
2186 #endif
2187
2188 if (priv->assoc_station_added)
2189 priv->lq_mngr.lq_ready = 1;
2190
2191 rs_initialize_lq(priv, conf, sta);
2192 }
2193
2194 static void rs_fill_link_cmd(struct iwl4965_lq_sta *lq_sta,
2195 struct iwl4965_rate *tx_mcs,
2196 struct iwl4965_link_quality_cmd *lq_cmd)
2197 {
2198 int index = 0;
2199 int rate_idx;
2200 int repeat_rate = 0;
2201 u8 ant_toggle_count = 0;
2202 u8 use_ht_possible = 1;
2203 struct iwl4965_rate new_rate;
2204 struct iwl4965_scale_tbl_info tbl_type = { 0 };
2205
2206 /* Override starting rate (index 0) if needed for debug purposes */
2207 rs_dbgfs_set_mcs(lq_sta, tx_mcs, index);
2208
2209 /* Interpret rate_n_flags */
2210 rs_get_tbl_info_from_mcs(tx_mcs, lq_sta->phymode,
2211 &tbl_type, &rate_idx);
2212
2213 /* How many times should we repeat the initial rate? */
2214 if (is_legacy(tbl_type.lq_type)) {
2215 ant_toggle_count = 1;
2216 repeat_rate = IWL_NUMBER_TRY;
2217 } else
2218 repeat_rate = IWL_HT_NUMBER_TRY;
2219
2220 lq_cmd->general_params.mimo_delimiter =
2221 is_mimo(tbl_type.lq_type) ? 1 : 0;
2222
2223 /* Fill 1st table entry (index 0) */
2224 lq_cmd->rs_table[index].rate_n_flags =
2225 cpu_to_le32(tx_mcs->rate_n_flags);
2226 new_rate.rate_n_flags = tx_mcs->rate_n_flags;
2227
2228 if (is_mimo(tbl_type.lq_type) || (tbl_type.antenna_type == ANT_MAIN))
2229 lq_cmd->general_params.single_stream_ant_msk
2230 = LINK_QUAL_ANT_A_MSK;
2231 else
2232 lq_cmd->general_params.single_stream_ant_msk
2233 = LINK_QUAL_ANT_B_MSK;
2234
2235 index++;
2236 repeat_rate--;
2237
2238 /* Fill rest of rate table */
2239 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2240 /* Repeat initial/next rate.
2241 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2242 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2243 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2244 if (is_legacy(tbl_type.lq_type)) {
2245 if (ant_toggle_count <
2246 NUM_TRY_BEFORE_ANTENNA_TOGGLE)
2247 ant_toggle_count++;
2248 else {
2249 rs_toggle_antenna(&new_rate, &tbl_type);
2250 ant_toggle_count = 1;
2251 }
2252 }
2253
2254 /* Override next rate if needed for debug purposes */
2255 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2256
2257 /* Fill next table entry */
2258 lq_cmd->rs_table[index].rate_n_flags =
2259 cpu_to_le32(new_rate.rate_n_flags);
2260 repeat_rate--;
2261 index++;
2262 }
2263
2264 rs_get_tbl_info_from_mcs(&new_rate, lq_sta->phymode, &tbl_type,
2265 &rate_idx);
2266
2267 /* Indicate to uCode which entries might be MIMO.
2268 * If initial rate was MIMO, this will finally end up
2269 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2270 if (is_mimo(tbl_type.lq_type))
2271 lq_cmd->general_params.mimo_delimiter = index;
2272
2273 /* Get next rate */
2274 rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2275 use_ht_possible, &new_rate);
2276
2277 /* How many times should we repeat the next rate? */
2278 if (is_legacy(tbl_type.lq_type)) {
2279 if (ant_toggle_count < NUM_TRY_BEFORE_ANTENNA_TOGGLE)
2280 ant_toggle_count++;
2281 else {
2282 rs_toggle_antenna(&new_rate, &tbl_type);
2283 ant_toggle_count = 1;
2284 }
2285 repeat_rate = IWL_NUMBER_TRY;
2286 } else
2287 repeat_rate = IWL_HT_NUMBER_TRY;
2288
2289 /* Don't allow HT rates after next pass.
2290 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2291 use_ht_possible = 0;
2292
2293 /* Override next rate if needed for debug purposes */
2294 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2295
2296 /* Fill next table entry */
2297 lq_cmd->rs_table[index].rate_n_flags =
2298 cpu_to_le32(new_rate.rate_n_flags);
2299
2300 index++;
2301 repeat_rate--;
2302 }
2303
2304 lq_cmd->general_params.dual_stream_ant_msk = 3;
2305 lq_cmd->agg_params.agg_dis_start_th = 3;
2306 lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
2307 }
2308
2309 static void *rs_alloc(struct ieee80211_local *local)
2310 {
2311 return local->hw.priv;
2312 }
2313 /* rate scale requires free function to be implemented */
2314 static void rs_free(void *priv_rate)
2315 {
2316 return;
2317 }
2318
2319 static void rs_clear(void *priv_rate)
2320 {
2321 struct iwl4965_priv *priv = (struct iwl4965_priv *) priv_rate;
2322
2323 IWL_DEBUG_RATE("enter\n");
2324
2325 priv->lq_mngr.lq_ready = 0;
2326 #ifdef CONFIG_IWL4965_HT
2327 #ifdef CONFIG_IWL4965_HT_AGG
2328 if (priv->lq_mngr.agg_ctrl.granted_ba)
2329 iwl4965_turn_off_agg(priv, TID_ALL_SPECIFIED);
2330 #endif /*CONFIG_IWL4965_HT_AGG */
2331 #endif /* CONFIG_IWL4965_HT */
2332
2333 IWL_DEBUG_RATE("leave\n");
2334 }
2335
2336 static void rs_free_sta(void *priv, void *priv_sta)
2337 {
2338 struct iwl4965_lq_sta *lq_sta = priv_sta;
2339
2340 IWL_DEBUG_RATE("enter\n");
2341 kfree(lq_sta);
2342 IWL_DEBUG_RATE("leave\n");
2343 }
2344
2345
2346 #ifdef CONFIG_MAC80211_DEBUGFS
2347 static int open_file_generic(struct inode *inode, struct file *file)
2348 {
2349 file->private_data = inode->i_private;
2350 return 0;
2351 }
2352 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
2353 struct iwl4965_rate *mcs, int index)
2354 {
2355 u32 base_rate;
2356
2357 if (lq_sta->phymode == (u8) MODE_IEEE80211A)
2358 base_rate = 0x800D;
2359 else
2360 base_rate = 0x820A;
2361
2362 if (lq_sta->dbg_fixed.rate_n_flags) {
2363 if (index < 12)
2364 mcs->rate_n_flags = lq_sta->dbg_fixed.rate_n_flags;
2365 else
2366 mcs->rate_n_flags = base_rate;
2367 IWL_DEBUG_RATE("Fixed rate ON\n");
2368 return;
2369 }
2370
2371 IWL_DEBUG_RATE("Fixed rate OFF\n");
2372 }
2373
2374 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2375 const char __user *user_buf, size_t count, loff_t *ppos)
2376 {
2377 struct iwl4965_lq_sta *lq_sta = file->private_data;
2378 char buf[64];
2379 int buf_size;
2380 u32 parsed_rate;
2381
2382 memset(buf, 0, sizeof(buf));
2383 buf_size = min(count, sizeof(buf) - 1);
2384 if (copy_from_user(buf, user_buf, buf_size))
2385 return -EFAULT;
2386
2387 if (sscanf(buf, "%x", &parsed_rate) == 1)
2388 lq_sta->dbg_fixed.rate_n_flags = parsed_rate;
2389 else
2390 lq_sta->dbg_fixed.rate_n_flags = 0;
2391
2392 lq_sta->active_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2393 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2394 lq_sta->active_mimo_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2395
2396 IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2397 lq_sta->lq.sta_id, lq_sta->dbg_fixed.rate_n_flags);
2398
2399 if (lq_sta->dbg_fixed.rate_n_flags) {
2400 rs_fill_link_cmd(lq_sta, &lq_sta->dbg_fixed, &lq_sta->lq);
2401 rs_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2402 }
2403
2404 return count;
2405 }
2406
2407 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2408 char __user *user_buf, size_t count, loff_t *ppos)
2409 {
2410 char buff[1024];
2411 int desc = 0;
2412 int i = 0;
2413
2414 struct iwl4965_lq_sta *lq_sta = file->private_data;
2415
2416 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2417 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2418 lq_sta->total_failed, lq_sta->total_success,
2419 lq_sta->active_rate);
2420 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2421 lq_sta->dbg_fixed.rate_n_flags);
2422 desc += sprintf(buff+desc, "general:"
2423 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2424 lq_sta->lq.general_params.flags,
2425 lq_sta->lq.general_params.mimo_delimiter,
2426 lq_sta->lq.general_params.single_stream_ant_msk,
2427 lq_sta->lq.general_params.dual_stream_ant_msk);
2428
2429 desc += sprintf(buff+desc, "agg:"
2430 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2431 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2432 lq_sta->lq.agg_params.agg_dis_start_th,
2433 lq_sta->lq.agg_params.agg_frame_cnt_limit);
2434
2435 desc += sprintf(buff+desc,
2436 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2437 lq_sta->lq.general_params.start_rate_index[0],
2438 lq_sta->lq.general_params.start_rate_index[1],
2439 lq_sta->lq.general_params.start_rate_index[2],
2440 lq_sta->lq.general_params.start_rate_index[3]);
2441
2442
2443 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2444 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
2445 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2446
2447 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2448 }
2449
2450 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2451 .write = rs_sta_dbgfs_scale_table_write,
2452 .read = rs_sta_dbgfs_scale_table_read,
2453 .open = open_file_generic,
2454 };
2455 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2456 char __user *user_buf, size_t count, loff_t *ppos)
2457 {
2458 char buff[1024];
2459 int desc = 0;
2460 int i, j;
2461
2462 struct iwl4965_lq_sta *lq_sta = file->private_data;
2463 for (i = 0; i < LQ_SIZE; i++) {
2464 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2465 "rate=0x%X\n",
2466 lq_sta->active_tbl == i?"*":"x",
2467 lq_sta->lq_info[i].lq_type,
2468 lq_sta->lq_info[i].is_SGI,
2469 lq_sta->lq_info[i].is_fat,
2470 lq_sta->lq_info[i].is_dup,
2471 lq_sta->lq_info[i].current_rate.rate_n_flags);
2472 for (j = 0; j < IWL_RATE_COUNT; j++) {
2473 desc += sprintf(buff+desc,
2474 "counter=%d success=%d %%=%d\n",
2475 lq_sta->lq_info[i].win[j].counter,
2476 lq_sta->lq_info[i].win[j].success_counter,
2477 lq_sta->lq_info[i].win[j].success_ratio);
2478 }
2479 }
2480 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2481 }
2482
2483 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2484 .read = rs_sta_dbgfs_stats_table_read,
2485 .open = open_file_generic,
2486 };
2487
2488 static void rs_add_debugfs(void *priv, void *priv_sta,
2489 struct dentry *dir)
2490 {
2491 struct iwl4965_lq_sta *lq_sta = priv_sta;
2492 lq_sta->rs_sta_dbgfs_scale_table_file =
2493 debugfs_create_file("rate_scale_table", 0600, dir,
2494 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2495 lq_sta->rs_sta_dbgfs_stats_table_file =
2496 debugfs_create_file("rate_stats_table", 0600, dir,
2497 lq_sta, &rs_sta_dbgfs_stats_table_ops);
2498 }
2499
2500 static void rs_remove_debugfs(void *priv, void *priv_sta)
2501 {
2502 struct iwl4965_lq_sta *lq_sta = priv_sta;
2503 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2504 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2505 }
2506 #endif
2507
2508 static struct rate_control_ops rs_ops = {
2509 .module = NULL,
2510 .name = RS_NAME,
2511 .tx_status = rs_tx_status,
2512 .get_rate = rs_get_rate,
2513 .rate_init = rs_rate_init,
2514 .clear = rs_clear,
2515 .alloc = rs_alloc,
2516 .free = rs_free,
2517 .alloc_sta = rs_alloc_sta,
2518 .free_sta = rs_free_sta,
2519 #ifdef CONFIG_MAC80211_DEBUGFS
2520 .add_sta_debugfs = rs_add_debugfs,
2521 .remove_sta_debugfs = rs_remove_debugfs,
2522 #endif
2523 };
2524
2525 int iwl4965_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id)
2526 {
2527 struct ieee80211_local *local = hw_to_local(hw);
2528 struct iwl4965_priv *priv = hw->priv;
2529 struct iwl4965_lq_sta *lq_sta;
2530 struct sta_info *sta;
2531 int cnt = 0, i;
2532 u32 samples = 0, success = 0, good = 0;
2533 unsigned long now = jiffies;
2534 u32 max_time = 0;
2535 u8 lq_type, antenna;
2536
2537 sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
2538 if (!sta || !sta->rate_ctrl_priv) {
2539 if (sta) {
2540 sta_info_put(sta);
2541 IWL_DEBUG_RATE("leave - no private rate data!\n");
2542 } else
2543 IWL_DEBUG_RATE("leave - no station!\n");
2544 return sprintf(buf, "station %d not found\n", sta_id);
2545 }
2546
2547 lq_sta = (void *)sta->rate_ctrl_priv;
2548
2549 lq_type = lq_sta->lq_info[lq_sta->active_tbl].lq_type;
2550 antenna = lq_sta->lq_info[lq_sta->active_tbl].antenna_type;
2551
2552 if (is_legacy(lq_type))
2553 i = IWL_RATE_54M_INDEX;
2554 else
2555 i = IWL_RATE_60M_INDEX;
2556 while (1) {
2557 u64 mask;
2558 int j;
2559 int active = lq_sta->active_tbl;
2560
2561 cnt +=
2562 sprintf(&buf[cnt], " %2dMbs: ", iwl4965_rates[i].ieee / 2);
2563
2564 mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1));
2565 for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1)
2566 buf[cnt++] =
2567 (lq_sta->lq_info[active].win[i].data & mask)
2568 ? '1' : '0';
2569
2570 samples += lq_sta->lq_info[active].win[i].counter;
2571 good += lq_sta->lq_info[active].win[i].success_counter;
2572 success += lq_sta->lq_info[active].win[i].success_counter *
2573 iwl4965_rates[i].ieee;
2574
2575 if (lq_sta->lq_info[active].win[i].stamp) {
2576 int delta =
2577 jiffies_to_msecs(now -
2578 lq_sta->lq_info[active].win[i].stamp);
2579
2580 if (delta > max_time)
2581 max_time = delta;
2582
2583 cnt += sprintf(&buf[cnt], "%5dms\n", delta);
2584 } else
2585 buf[cnt++] = '\n';
2586
2587 j = iwl4965_get_prev_ieee_rate(i);
2588 if (j == i)
2589 break;
2590 i = j;
2591 }
2592
2593 /* Display the average rate of all samples taken.
2594 *
2595 * NOTE: We multiply # of samples by 2 since the IEEE measurement
2596 * added from iwl4965_rates is actually 2X the rate */
2597 if (samples)
2598 cnt += sprintf(&buf[cnt],
2599 "\nAverage rate is %3d.%02dMbs over last %4dms\n"
2600 "%3d%% success (%d good packets over %d tries)\n",
2601 success / (2 * samples), (success * 5 / samples) % 10,
2602 max_time, good * 100 / samples, good, samples);
2603 else
2604 cnt += sprintf(&buf[cnt], "\nAverage rate: 0Mbs\n");
2605
2606 cnt += sprintf(&buf[cnt], "\nrate scale type %d antenna %d "
2607 "active_search %d rate index %d\n", lq_type, antenna,
2608 lq_sta->search_better_tbl, sta->last_txrate);
2609
2610 sta_info_put(sta);
2611 return cnt;
2612 }
2613
2614 void iwl4965_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
2615 {
2616 struct iwl4965_priv *priv = hw->priv;
2617
2618 priv->lq_mngr.lq_ready = 1;
2619 }
2620
2621 void iwl4965_rate_control_register(struct ieee80211_hw *hw)
2622 {
2623 ieee80211_rate_control_register(&rs_ops);
2624 }
2625
2626 void iwl4965_rate_control_unregister(struct ieee80211_hw *hw)
2627 {
2628 ieee80211_rate_control_unregister(&rs_ops);
2629 }
2630
WRT350N Kernel Patches