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1 | /****************************************************************************** | |
2 | * | |
3 | * Copyright(c) 2005 - 2008 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 | ||
32 | #include <linux/netdevice.h> | |
33 | #include <linux/etherdevice.h> | |
34 | #include <linux/delay.h> | |
35 | ||
36 | #include <linux/workqueue.h> | |
37 | ||
38 | #include "../net/mac80211/rate.h" | |
39 | ||
40 | #include "iwl-dev.h" | |
41 | #include "iwl-sta.h" | |
42 | #include "iwl-core.h" | |
43 | #include "iwl-helpers.h" | |
44 | ||
45 | #define RS_NAME "iwl-agn-rs" | |
46 | ||
47 | #define NUM_TRY_BEFORE_ANT_TOGGLE 1 | |
48 | #define IWL_NUMBER_TRY 1 | |
49 | #define IWL_HT_NUMBER_TRY 3 | |
50 | ||
51 | #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */ | |
52 | #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */ | |
53 | #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */ | |
54 | ||
55 | /* max time to accum history 2 seconds */ | |
56 | #define IWL_RATE_SCALE_FLUSH_INTVL (2*HZ) | |
57 | ||
58 | static u8 rs_ht_to_legacy[] = { | |
59 | IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX, | |
60 | IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX, | |
61 | IWL_RATE_6M_INDEX, | |
62 | IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX, | |
63 | IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX, | |
64 | IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX, | |
65 | IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX | |
66 | }; | |
67 | ||
68 | static const u8 ant_toggle_lookup[] = { | |
69 | /*ANT_NONE -> */ ANT_NONE, | |
70 | /*ANT_A -> */ ANT_B, | |
71 | /*ANT_B -> */ ANT_C, | |
72 | /*ANT_AB -> */ ANT_BC, | |
73 | /*ANT_C -> */ ANT_A, | |
74 | /*ANT_AC -> */ ANT_AB, | |
75 | /*ANT_BC -> */ ANT_AC, | |
76 | /*ANT_ABC -> */ ANT_ABC, | |
77 | }; | |
78 | ||
79 | /** | |
80 | * struct iwl_rate_scale_data -- tx success history for one rate | |
81 | */ | |
82 | struct iwl_rate_scale_data { | |
83 | u64 data; /* bitmap of successful frames */ | |
84 | s32 success_counter; /* number of frames successful */ | |
85 | s32 success_ratio; /* per-cent * 128 */ | |
86 | s32 counter; /* number of frames attempted */ | |
87 | s32 average_tpt; /* success ratio * expected throughput */ | |
88 | unsigned long stamp; | |
89 | }; | |
90 | ||
91 | /** | |
92 | * struct iwl_scale_tbl_info -- tx params and success history for all rates | |
93 | * | |
94 | * There are two of these in struct iwl_lq_sta, | |
95 | * one for "active", and one for "search". | |
96 | */ | |
97 | struct iwl_scale_tbl_info { | |
98 | enum iwl_table_type lq_type; | |
99 | u8 ant_type; | |
100 | u8 is_SGI; /* 1 = short guard interval */ | |
101 | u8 is_fat; /* 1 = 40 MHz channel width */ | |
102 | u8 is_dup; /* 1 = duplicated data streams */ | |
103 | u8 action; /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */ | |
104 | s32 *expected_tpt; /* throughput metrics; expected_tpt_G, etc. */ | |
105 | u32 current_rate; /* rate_n_flags, uCode API format */ | |
106 | struct iwl_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */ | |
107 | }; | |
108 | ||
109 | struct iwl_traffic_load { | |
110 | unsigned long time_stamp; /* age of the oldest statistics */ | |
111 | u32 packet_count[TID_QUEUE_MAX_SIZE]; /* packet count in this time | |
112 | * slice */ | |
113 | u32 total; /* total num of packets during the | |
114 | * last TID_MAX_TIME_DIFF */ | |
115 | u8 queue_count; /* number of queues that has | |
116 | * been used since the last cleanup */ | |
117 | u8 head; /* start of the circular buffer */ | |
118 | }; | |
119 | ||
120 | /** | |
121 | * struct iwl_lq_sta -- driver's rate scaling private structure | |
122 | * | |
123 | * Pointer to this gets passed back and forth between driver and mac80211. | |
124 | */ | |
125 | struct iwl_lq_sta { | |
126 | u8 active_tbl; /* index of active table, range 0-1 */ | |
127 | u8 enable_counter; /* indicates HT mode */ | |
128 | u8 stay_in_tbl; /* 1: disallow, 0: allow search for new mode */ | |
129 | u8 search_better_tbl; /* 1: currently trying alternate mode */ | |
130 | s32 last_tpt; | |
131 | ||
132 | /* The following determine when to search for a new mode */ | |
133 | u32 table_count_limit; | |
134 | u32 max_failure_limit; /* # failed frames before new search */ | |
135 | u32 max_success_limit; /* # successful frames before new search */ | |
136 | u32 table_count; | |
137 | u32 total_failed; /* total failed frames, any/all rates */ | |
138 | u32 total_success; /* total successful frames, any/all rates */ | |
139 | u32 flush_timer; /* time staying in mode before new search */ | |
140 | ||
141 | u8 action_counter; /* # mode-switch actions tried */ | |
142 | u8 is_green; | |
143 | u8 is_dup; | |
144 | enum ieee80211_band band; | |
145 | u8 ibss_sta_added; | |
146 | ||
147 | /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */ | |
148 | u32 supp_rates; | |
149 | u16 active_legacy_rate; | |
150 | u16 active_siso_rate; | |
151 | u16 active_mimo2_rate; | |
152 | u16 active_mimo3_rate; | |
153 | u16 active_rate_basic; | |
154 | ||
155 | struct iwl_link_quality_cmd lq; | |
156 | struct iwl_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */ | |
157 | struct iwl_traffic_load load[TID_MAX_LOAD_COUNT]; | |
158 | u8 tx_agg_tid_en; | |
159 | #ifdef CONFIG_MAC80211_DEBUGFS | |
160 | struct dentry *rs_sta_dbgfs_scale_table_file; | |
161 | struct dentry *rs_sta_dbgfs_stats_table_file; | |
162 | struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file; | |
163 | u32 dbg_fixed_rate; | |
164 | #endif | |
165 | struct iwl_priv *drv; | |
166 | ||
167 | /* used to be in sta_info */ | |
168 | int last_txrate_idx; | |
169 | }; | |
170 | ||
171 | static void rs_rate_scale_perform(struct iwl_priv *priv, | |
172 | struct net_device *dev, | |
173 | struct ieee80211_hdr *hdr, | |
174 | struct sta_info *sta); | |
175 | static void rs_fill_link_cmd(const struct iwl_priv *priv, | |
176 | struct iwl_lq_sta *lq_sta, u32 rate_n_flags); | |
177 | ||
178 | ||
179 | #ifdef CONFIG_MAC80211_DEBUGFS | |
180 | static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta, | |
181 | u32 *rate_n_flags, int index); | |
182 | #else | |
183 | static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta, | |
184 | u32 *rate_n_flags, int index) | |
185 | {} | |
186 | #endif | |
187 | ||
188 | /* | |
189 | * Expected throughput metrics for following rates: | |
190 | * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits | |
191 | * "G" is the only table that supports CCK (the first 4 rates). | |
192 | */ | |
193 | /*FIXME:RS:need to spearate tables for MIMO2/MIMO3*/ | |
194 | static s32 expected_tpt_A[IWL_RATE_COUNT] = { | |
195 | 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186 | |
196 | }; | |
197 | ||
198 | static s32 expected_tpt_G[IWL_RATE_COUNT] = { | |
199 | 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186 | |
200 | }; | |
201 | ||
202 | static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = { | |
203 | 0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202 | |
204 | }; | |
205 | ||
206 | static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = { | |
207 | 0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211 | |
208 | }; | |
209 | ||
210 | static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = { | |
211 | 0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251 | |
212 | }; | |
213 | ||
214 | static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = { | |
215 | 0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257 | |
216 | }; | |
217 | ||
218 | static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = { | |
219 | 0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257 | |
220 | }; | |
221 | ||
222 | static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = { | |
223 | 0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264 | |
224 | }; | |
225 | ||
226 | static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = { | |
227 | 0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289 | |
228 | }; | |
229 | ||
230 | static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = { | |
231 | 0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293 | |
232 | }; | |
233 | ||
234 | static inline u8 rs_extract_rate(u32 rate_n_flags) | |
235 | { | |
236 | return (u8)(rate_n_flags & 0xFF); | |
237 | } | |
238 | ||
239 | static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window) | |
240 | { | |
241 | window->data = 0; | |
242 | window->success_counter = 0; | |
243 | window->success_ratio = IWL_INVALID_VALUE; | |
244 | window->counter = 0; | |
245 | window->average_tpt = IWL_INVALID_VALUE; | |
246 | window->stamp = 0; | |
247 | } | |
248 | ||
249 | static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type) | |
250 | { | |
251 | return (ant_type & valid_antenna) == ant_type; | |
252 | } | |
253 | ||
254 | /* | |
255 | * removes the old data from the statistics. All data that is older than | |
256 | * TID_MAX_TIME_DIFF, will be deleted. | |
257 | */ | |
258 | static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time) | |
259 | { | |
260 | /* The oldest age we want to keep */ | |
261 | u32 oldest_time = curr_time - TID_MAX_TIME_DIFF; | |
262 | ||
263 | while (tl->queue_count && | |
264 | (tl->time_stamp < oldest_time)) { | |
265 | tl->total -= tl->packet_count[tl->head]; | |
266 | tl->packet_count[tl->head] = 0; | |
267 | tl->time_stamp += TID_QUEUE_CELL_SPACING; | |
268 | tl->queue_count--; | |
269 | tl->head++; | |
270 | if (tl->head >= TID_QUEUE_MAX_SIZE) | |
271 | tl->head = 0; | |
272 | } | |
273 | } | |
274 | ||
275 | /* | |
276 | * increment traffic load value for tid and also remove | |
277 | * any old values if passed the certain time period | |
278 | */ | |
279 | static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data, | |
280 | struct ieee80211_hdr *hdr) | |
281 | { | |
282 | u32 curr_time = jiffies_to_msecs(jiffies); | |
283 | u32 time_diff; | |
284 | s32 index; | |
285 | struct iwl_traffic_load *tl = NULL; | |
286 | __le16 fc = hdr->frame_control; | |
287 | u8 tid; | |
288 | ||
289 | if (ieee80211_is_data_qos(fc)) { | |
290 | u8 *qc = ieee80211_get_qos_ctl(hdr); | |
291 | tid = qc[0] & 0xf; | |
292 | } else | |
293 | return MAX_TID_COUNT; | |
294 | ||
295 | tl = &lq_data->load[tid]; | |
296 | ||
297 | curr_time -= curr_time % TID_ROUND_VALUE; | |
298 | ||
299 | /* Happens only for the first packet. Initialize the data */ | |
300 | if (!(tl->queue_count)) { | |
301 | tl->total = 1; | |
302 | tl->time_stamp = curr_time; | |
303 | tl->queue_count = 1; | |
304 | tl->head = 0; | |
305 | tl->packet_count[0] = 1; | |
306 | return MAX_TID_COUNT; | |
307 | } | |
308 | ||
309 | time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time); | |
310 | index = time_diff / TID_QUEUE_CELL_SPACING; | |
311 | ||
312 | /* The history is too long: remove data that is older than */ | |
313 | /* TID_MAX_TIME_DIFF */ | |
314 | if (index >= TID_QUEUE_MAX_SIZE) | |
315 | rs_tl_rm_old_stats(tl, curr_time); | |
316 | ||
317 | index = (tl->head + index) % TID_QUEUE_MAX_SIZE; | |
318 | tl->packet_count[index] = tl->packet_count[index] + 1; | |
319 | tl->total = tl->total + 1; | |
320 | ||
321 | if ((index + 1) > tl->queue_count) | |
322 | tl->queue_count = index + 1; | |
323 | ||
324 | return tid; | |
325 | } | |
326 | ||
327 | /* | |
328 | get the traffic load value for tid | |
329 | */ | |
330 | static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid) | |
331 | { | |
332 | u32 curr_time = jiffies_to_msecs(jiffies); | |
333 | u32 time_diff; | |
334 | s32 index; | |
335 | struct iwl_traffic_load *tl = NULL; | |
336 | ||
337 | if (tid >= TID_MAX_LOAD_COUNT) | |
338 | return 0; | |
339 | ||
340 | tl = &(lq_data->load[tid]); | |
341 | ||
342 | curr_time -= curr_time % TID_ROUND_VALUE; | |
343 | ||
344 | if (!(tl->queue_count)) | |
345 | return 0; | |
346 | ||
347 | time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time); | |
348 | index = time_diff / TID_QUEUE_CELL_SPACING; | |
349 | ||
350 | /* The history is too long: remove data that is older than */ | |
351 | /* TID_MAX_TIME_DIFF */ | |
352 | if (index >= TID_QUEUE_MAX_SIZE) | |
353 | rs_tl_rm_old_stats(tl, curr_time); | |
354 | ||
355 | return tl->total; | |
356 | } | |
357 | ||
358 | static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv, | |
359 | struct iwl_lq_sta *lq_data, u8 tid, | |
360 | struct sta_info *sta) | |
361 | { | |
362 | unsigned long state; | |
363 | DECLARE_MAC_BUF(mac); | |
364 | ||
365 | spin_lock_bh(&sta->lock); | |
366 | state = sta->ampdu_mlme.tid_state_tx[tid]; | |
367 | spin_unlock_bh(&sta->lock); | |
368 | ||
369 | if (state == HT_AGG_STATE_IDLE && | |
370 | rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) { | |
371 | IWL_DEBUG_HT("Starting Tx agg: STA: %s tid: %d\n", | |
372 | print_mac(mac, sta->sta.addr), tid); | |
373 | ieee80211_start_tx_ba_session(priv->hw, sta->sta.addr, tid); | |
374 | } | |
375 | } | |
376 | ||
377 | static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid, | |
378 | struct iwl_lq_sta *lq_data, | |
379 | struct sta_info *sta) | |
380 | { | |
381 | if ((tid < TID_MAX_LOAD_COUNT)) | |
382 | rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta); | |
383 | else if (tid == IWL_AGG_ALL_TID) | |
384 | for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++) | |
385 | rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta); | |
386 | } | |
387 | ||
388 | static inline int get_num_of_ant_from_rate(u32 rate_n_flags) | |
389 | { | |
390 | return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) + | |
391 | !!(rate_n_flags & RATE_MCS_ANT_B_MSK) + | |
392 | !!(rate_n_flags & RATE_MCS_ANT_C_MSK); | |
393 | } | |
394 | ||
395 | /** | |
396 | * rs_collect_tx_data - Update the success/failure sliding window | |
397 | * | |
398 | * We keep a sliding window of the last 62 packets transmitted | |
399 | * at this rate. window->data contains the bitmask of successful | |
400 | * packets. | |
401 | */ | |
402 | static int rs_collect_tx_data(struct iwl_rate_scale_data *windows, | |
403 | int scale_index, s32 tpt, int retries, | |
404 | int successes) | |
405 | { | |
406 | struct iwl_rate_scale_data *window = NULL; | |
407 | static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1)); | |
408 | s32 fail_count; | |
409 | ||
410 | if (scale_index < 0 || scale_index >= IWL_RATE_COUNT) | |
411 | return -EINVAL; | |
412 | ||
413 | /* Select data for current tx bit rate */ | |
414 | window = &(windows[scale_index]); | |
415 | ||
416 | /* | |
417 | * Keep track of only the latest 62 tx frame attempts in this rate's | |
418 | * history window; anything older isn't really relevant any more. | |
419 | * If we have filled up the sliding window, drop the oldest attempt; | |
420 | * if the oldest attempt (highest bit in bitmap) shows "success", | |
421 | * subtract "1" from the success counter (this is the main reason | |
422 | * we keep these bitmaps!). | |
423 | */ | |
424 | while (retries > 0) { | |
425 | if (window->counter >= IWL_RATE_MAX_WINDOW) { | |
426 | ||
427 | /* remove earliest */ | |
428 | window->counter = IWL_RATE_MAX_WINDOW - 1; | |
429 | ||
430 | if (window->data & mask) { | |
431 | window->data &= ~mask; | |
432 | window->success_counter--; | |
433 | } | |
434 | } | |
435 | ||
436 | /* Increment frames-attempted counter */ | |
437 | window->counter++; | |
438 | ||
439 | /* Shift bitmap by one frame (throw away oldest history), | |
440 | * OR in "1", and increment "success" if this | |
441 | * frame was successful. */ | |
442 | window->data <<= 1; | |
443 | if (successes > 0) { | |
444 | window->success_counter++; | |
445 | window->data |= 0x1; | |
446 | successes--; | |
447 | } | |
448 | ||
449 | retries--; | |
450 | } | |
451 | ||
452 | /* Calculate current success ratio, avoid divide-by-0! */ | |
453 | if (window->counter > 0) | |
454 | window->success_ratio = 128 * (100 * window->success_counter) | |
455 | / window->counter; | |
456 | else | |
457 | window->success_ratio = IWL_INVALID_VALUE; | |
458 | ||
459 | fail_count = window->counter - window->success_counter; | |
460 | ||
461 | /* Calculate average throughput, if we have enough history. */ | |
462 | if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) || | |
463 | (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH)) | |
464 | window->average_tpt = (window->success_ratio * tpt + 64) / 128; | |
465 | else | |
466 | window->average_tpt = IWL_INVALID_VALUE; | |
467 | ||
468 | /* Tag this window as having been updated */ | |
469 | window->stamp = jiffies; | |
470 | ||
471 | return 0; | |
472 | } | |
473 | ||
474 | /* | |
475 | * Fill uCode API rate_n_flags field, based on "search" or "active" table. | |
476 | */ | |
477 | /* FIXME:RS:remove this function and put the flags statically in the table */ | |
478 | static u32 rate_n_flags_from_tbl(struct iwl_scale_tbl_info *tbl, | |
479 | int index, u8 use_green) | |
480 | { | |
481 | u32 rate_n_flags = 0; | |
482 | ||
483 | if (is_legacy(tbl->lq_type)) { | |
484 | rate_n_flags = iwl_rates[index].plcp; | |
485 | if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE) | |
486 | rate_n_flags |= RATE_MCS_CCK_MSK; | |
487 | ||
488 | } else if (is_Ht(tbl->lq_type)) { | |
489 | if (index > IWL_LAST_OFDM_RATE) { | |
490 | IWL_ERROR("invalid HT rate index %d\n", index); | |
491 | index = IWL_LAST_OFDM_RATE; | |
492 | } | |
493 | rate_n_flags = RATE_MCS_HT_MSK; | |
494 | ||
495 | if (is_siso(tbl->lq_type)) | |
496 | rate_n_flags |= iwl_rates[index].plcp_siso; | |
497 | else if (is_mimo2(tbl->lq_type)) | |
498 | rate_n_flags |= iwl_rates[index].plcp_mimo2; | |
499 | else | |
500 | rate_n_flags |= iwl_rates[index].plcp_mimo3; | |
501 | } else { | |
502 | IWL_ERROR("Invalid tbl->lq_type %d\n", tbl->lq_type); | |
503 | } | |
504 | ||
505 | rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) & | |
506 | RATE_MCS_ANT_ABC_MSK); | |
507 | ||
508 | if (is_Ht(tbl->lq_type)) { | |
509 | if (tbl->is_fat) { | |
510 | if (tbl->is_dup) | |
511 | rate_n_flags |= RATE_MCS_DUP_MSK; | |
512 | else | |
513 | rate_n_flags |= RATE_MCS_FAT_MSK; | |
514 | } | |
515 | if (tbl->is_SGI) | |
516 | rate_n_flags |= RATE_MCS_SGI_MSK; | |
517 | ||
518 | if (use_green) { | |
519 | rate_n_flags |= RATE_MCS_GF_MSK; | |
520 | if (is_siso(tbl->lq_type) && tbl->is_SGI) { | |
521 | rate_n_flags &= ~RATE_MCS_SGI_MSK; | |
522 | IWL_ERROR("GF was set with SGI:SISO\n"); | |
523 | } | |
524 | } | |
525 | } | |
526 | return rate_n_flags; | |
527 | } | |
528 | ||
529 | /* | |
530 | * Interpret uCode API's rate_n_flags format, | |
531 | * fill "search" or "active" tx mode table. | |
532 | */ | |
533 | static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags, | |
534 | enum ieee80211_band band, | |
535 | struct iwl_scale_tbl_info *tbl, | |
536 | int *rate_idx) | |
537 | { | |
538 | u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK); | |
539 | u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags); | |
540 | u8 mcs; | |
541 | ||
542 | *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags); | |
543 | ||
544 | if (*rate_idx == IWL_RATE_INVALID) { | |
545 | *rate_idx = -1; | |
546 | return -EINVAL; | |
547 | } | |
548 | tbl->is_SGI = 0; /* default legacy setup */ | |
549 | tbl->is_fat = 0; | |
550 | tbl->is_dup = 0; | |
551 | tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS); | |
552 | tbl->lq_type = LQ_NONE; | |
553 | ||
554 | /* legacy rate format */ | |
555 | if (!(rate_n_flags & RATE_MCS_HT_MSK)) { | |
556 | if (num_of_ant == 1) { | |
557 | if (band == IEEE80211_BAND_5GHZ) | |
558 | tbl->lq_type = LQ_A; | |
559 | else | |
560 | tbl->lq_type = LQ_G; | |
561 | } | |
562 | /* HT rate format */ | |
563 | } else { | |
564 | if (rate_n_flags & RATE_MCS_SGI_MSK) | |
565 | tbl->is_SGI = 1; | |
566 | ||
567 | if ((rate_n_flags & RATE_MCS_FAT_MSK) || | |
568 | (rate_n_flags & RATE_MCS_DUP_MSK)) | |
569 | tbl->is_fat = 1; | |
570 | ||
571 | if (rate_n_flags & RATE_MCS_DUP_MSK) | |
572 | tbl->is_dup = 1; | |
573 | ||
574 | mcs = rs_extract_rate(rate_n_flags); | |
575 | ||
576 | /* SISO */ | |
577 | if (mcs <= IWL_RATE_SISO_60M_PLCP) { | |
578 | if (num_of_ant == 1) | |
579 | tbl->lq_type = LQ_SISO; /*else NONE*/ | |
580 | /* MIMO2 */ | |
581 | } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) { | |
582 | if (num_of_ant == 2) | |
583 | tbl->lq_type = LQ_MIMO2; | |
584 | /* MIMO3 */ | |
585 | } else { | |
586 | if (num_of_ant == 3) | |
587 | tbl->lq_type = LQ_MIMO3; | |
588 | } | |
589 | } | |
590 | return 0; | |
591 | } | |
592 | ||
593 | /* switch to another antenna/antennas and return 1 */ | |
594 | /* if no other valid antenna found, return 0 */ | |
595 | static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags, | |
596 | struct iwl_scale_tbl_info *tbl) | |
597 | { | |
598 | u8 new_ant_type; | |
599 | ||
600 | if (!tbl->ant_type || tbl->ant_type > ANT_ABC) | |
601 | return 0; | |
602 | ||
603 | if (!rs_is_valid_ant(valid_ant, tbl->ant_type)) | |
604 | return 0; | |
605 | ||
606 | new_ant_type = ant_toggle_lookup[tbl->ant_type]; | |
607 | ||
608 | while ((new_ant_type != tbl->ant_type) && | |
609 | !rs_is_valid_ant(valid_ant, new_ant_type)) | |
610 | new_ant_type = ant_toggle_lookup[new_ant_type]; | |
611 | ||
612 | if (new_ant_type == tbl->ant_type) | |
613 | return 0; | |
614 | ||
615 | tbl->ant_type = new_ant_type; | |
616 | *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK; | |
617 | *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS; | |
618 | return 1; | |
619 | } | |
620 | ||
621 | /* FIXME:RS: in 4965 we don't use greenfield at all */ | |
622 | /* FIXME:RS: don't use greenfield for now in TX */ | |
623 | #if 0 | |
624 | static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf) | |
625 | { | |
626 | return (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) && | |
627 | priv->current_ht_config.is_green_field && | |
628 | !priv->current_ht_config.non_GF_STA_present; | |
629 | } | |
630 | #endif | |
631 | static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf) | |
632 | { | |
633 | return 0; | |
634 | } | |
635 | ||
636 | /** | |
637 | * rs_get_supported_rates - get the available rates | |
638 | * | |
639 | * if management frame or broadcast frame only return | |
640 | * basic available rates. | |
641 | * | |
642 | */ | |
643 | static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta, | |
644 | struct ieee80211_hdr *hdr, | |
645 | enum iwl_table_type rate_type) | |
646 | { | |
647 | if (hdr && is_multicast_ether_addr(hdr->addr1) && | |
648 | lq_sta->active_rate_basic) | |
649 | return lq_sta->active_rate_basic; | |
650 | ||
651 | if (is_legacy(rate_type)) { | |
652 | return lq_sta->active_legacy_rate; | |
653 | } else { | |
654 | if (is_siso(rate_type)) | |
655 | return lq_sta->active_siso_rate; | |
656 | else if (is_mimo2(rate_type)) | |
657 | return lq_sta->active_mimo2_rate; | |
658 | else | |
659 | return lq_sta->active_mimo3_rate; | |
660 | } | |
661 | } | |
662 | ||
663 | static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask, | |
664 | int rate_type) | |
665 | { | |
666 | u8 high = IWL_RATE_INVALID; | |
667 | u8 low = IWL_RATE_INVALID; | |
668 | ||
669 | /* 802.11A or ht walks to the next literal adjacent rate in | |
670 | * the rate table */ | |
671 | if (is_a_band(rate_type) || !is_legacy(rate_type)) { | |
672 | int i; | |
673 | u32 mask; | |
674 | ||
675 | /* Find the previous rate that is in the rate mask */ | |
676 | i = index - 1; | |
677 | for (mask = (1 << i); i >= 0; i--, mask >>= 1) { | |
678 | if (rate_mask & mask) { | |
679 | low = i; | |
680 | break; | |
681 | } | |
682 | } | |
683 | ||
684 | /* Find the next rate that is in the rate mask */ | |
685 | i = index + 1; | |
686 | for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) { | |
687 | if (rate_mask & mask) { | |
688 | high = i; | |
689 | break; | |
690 | } | |
691 | } | |
692 | ||
693 | return (high << 8) | low; | |
694 | } | |
695 | ||
696 | low = index; | |
697 | while (low != IWL_RATE_INVALID) { | |
698 | low = iwl_rates[low].prev_rs; | |
699 | if (low == IWL_RATE_INVALID) | |
700 | break; | |
701 | if (rate_mask & (1 << low)) | |
702 | break; | |
703 | IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low); | |
704 | } | |
705 | ||
706 | high = index; | |
707 | while (high != IWL_RATE_INVALID) { | |
708 | high = iwl_rates[high].next_rs; | |
709 | if (high == IWL_RATE_INVALID) | |
710 | break; | |
711 | if (rate_mask & (1 << high)) | |
712 | break; | |
713 | IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high); | |
714 | } | |
715 | ||
716 | return (high << 8) | low; | |
717 | } | |
718 | ||
719 | static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta, | |
720 | struct iwl_scale_tbl_info *tbl, | |
721 | u8 scale_index, u8 ht_possible) | |
722 | { | |
723 | s32 low; | |
724 | u16 rate_mask; | |
725 | u16 high_low; | |
726 | u8 switch_to_legacy = 0; | |
727 | u8 is_green = lq_sta->is_green; | |
728 | ||
729 | /* check if we need to switch from HT to legacy rates. | |
730 | * assumption is that mandatory rates (1Mbps or 6Mbps) | |
731 | * are always supported (spec demand) */ | |
732 | if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) { | |
733 | switch_to_legacy = 1; | |
734 | scale_index = rs_ht_to_legacy[scale_index]; | |
735 | if (lq_sta->band == IEEE80211_BAND_5GHZ) | |
736 | tbl->lq_type = LQ_A; | |
737 | else | |
738 | tbl->lq_type = LQ_G; | |
739 | ||
740 | if (num_of_ant(tbl->ant_type) > 1) | |
741 | tbl->ant_type = ANT_A;/*FIXME:RS*/ | |
742 | ||
743 | tbl->is_fat = 0; | |
744 | tbl->is_SGI = 0; | |
745 | } | |
746 | ||
747 | rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type); | |
748 | ||
749 | /* Mask with station rate restriction */ | |
750 | if (is_legacy(tbl->lq_type)) { | |
751 | /* supp_rates has no CCK bits in A mode */ | |
752 | if (lq_sta->band == IEEE80211_BAND_5GHZ) | |
753 | rate_mask = (u16)(rate_mask & | |
754 | (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE)); | |
755 | else | |
756 | rate_mask = (u16)(rate_mask & lq_sta->supp_rates); | |
757 | } | |
758 | ||
759 | /* If we switched from HT to legacy, check current rate */ | |
760 | if (switch_to_legacy && (rate_mask & (1 << scale_index))) { | |
761 | low = scale_index; | |
762 | goto out; | |
763 | } | |
764 | ||
765 | high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask, | |
766 | tbl->lq_type); | |
767 | low = high_low & 0xff; | |
768 | ||
769 | if (low == IWL_RATE_INVALID) | |
770 | low = scale_index; | |
771 | ||
772 | out: | |
773 | return rate_n_flags_from_tbl(tbl, low, is_green); | |
774 | } | |
775 | ||
776 | /* | |
777 | * mac80211 sends us Tx status | |
778 | */ | |
779 | static void rs_tx_status(void *priv_rate, struct net_device *dev, | |
780 | struct sk_buff *skb) | |
781 | { | |
782 | int status; | |
783 | u8 retries; | |
784 | int rs_index, index = 0; | |
785 | struct iwl_lq_sta *lq_sta; | |
786 | struct iwl_link_quality_cmd *table; | |
787 | struct sta_info *sta; | |
788 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
789 | struct iwl_priv *priv = (struct iwl_priv *)priv_rate; | |
790 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
791 | struct ieee80211_hw *hw = local_to_hw(local); | |
792 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
793 | struct iwl_rate_scale_data *window = NULL; | |
794 | struct iwl_rate_scale_data *search_win = NULL; | |
795 | u32 tx_rate; | |
796 | struct iwl_scale_tbl_info tbl_type; | |
797 | struct iwl_scale_tbl_info *curr_tbl, *search_tbl; | |
798 | u8 active_index = 0; | |
799 | __le16 fc = hdr->frame_control; | |
800 | s32 tpt = 0; | |
801 | ||
802 | IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n"); | |
803 | ||
804 | if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) | |
805 | return; | |
806 | ||
807 | /* This packet was aggregated but doesn't carry rate scale info */ | |
808 | if ((info->flags & IEEE80211_TX_CTL_AMPDU) && | |
809 | !(info->flags & IEEE80211_TX_STAT_AMPDU)) | |
810 | return; | |
811 | ||
812 | retries = info->status.retry_count; | |
813 | ||
814 | if (retries > 15) | |
815 | retries = 15; | |
816 | ||
817 | rcu_read_lock(); | |
818 | ||
819 | sta = sta_info_get(local, hdr->addr1); | |
820 | ||
821 | if (!sta || !sta->rate_ctrl_priv) | |
822 | goto out; | |
823 | ||
824 | ||
825 | lq_sta = (struct iwl_lq_sta *)sta->rate_ctrl_priv; | |
826 | ||
827 | if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) && | |
828 | !lq_sta->ibss_sta_added) | |
829 | goto out; | |
830 | ||
831 | table = &lq_sta->lq; | |
832 | active_index = lq_sta->active_tbl; | |
833 | ||
834 | curr_tbl = &(lq_sta->lq_info[active_index]); | |
835 | search_tbl = &(lq_sta->lq_info[(1 - active_index)]); | |
836 | window = (struct iwl_rate_scale_data *)&(curr_tbl->win[0]); | |
837 | search_win = (struct iwl_rate_scale_data *)&(search_tbl->win[0]); | |
838 | ||
839 | /* | |
840 | * Ignore this Tx frame response if its initial rate doesn't match | |
841 | * that of latest Link Quality command. There may be stragglers | |
842 | * from a previous Link Quality command, but we're no longer interested | |
843 | * in those; they're either from the "active" mode while we're trying | |
844 | * to check "search" mode, or a prior "search" mode after we've moved | |
845 | * to a new "search" mode (which might become the new "active" mode). | |
846 | */ | |
847 | tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags); | |
848 | rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index); | |
849 | if (priv->band == IEEE80211_BAND_5GHZ) | |
850 | rs_index -= IWL_FIRST_OFDM_RATE; | |
851 | ||
852 | if ((info->tx_rate_idx < 0) || | |
853 | (tbl_type.is_SGI ^ | |
854 | !!(info->flags & IEEE80211_TX_CTL_SHORT_GI)) || | |
855 | (tbl_type.is_fat ^ | |
856 | !!(info->flags & IEEE80211_TX_CTL_40_MHZ_WIDTH)) || | |
857 | (tbl_type.is_dup ^ | |
858 | !!(info->flags & IEEE80211_TX_CTL_DUP_DATA)) || | |
859 | (tbl_type.ant_type ^ info->antenna_sel_tx) || | |
860 | (!!(tx_rate & RATE_MCS_HT_MSK) ^ | |
861 | !!(info->flags & IEEE80211_TX_CTL_OFDM_HT)) || | |
862 | (!!(tx_rate & RATE_MCS_GF_MSK) ^ | |
863 | !!(info->flags & IEEE80211_TX_CTL_GREEN_FIELD)) || | |
864 | (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate != | |
865 | hw->wiphy->bands[info->band]->bitrates[info->tx_rate_idx].bitrate)) { | |
866 | IWL_DEBUG_RATE("initial rate does not match 0x%x\n", tx_rate); | |
867 | goto out; | |
868 | } | |
869 | ||
870 | /* Update frame history window with "failure" for each Tx retry. */ | |
871 | while (retries) { | |
872 | /* Look up the rate and other info used for each tx attempt. | |
873 | * Each tx attempt steps one entry deeper in the rate table. */ | |
874 | tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags); | |
875 | rs_get_tbl_info_from_mcs(tx_rate, priv->band, | |
876 | &tbl_type, &rs_index); | |
877 | ||
878 | /* If type matches "search" table, | |
879 | * add failure to "search" history */ | |
880 | if ((tbl_type.lq_type == search_tbl->lq_type) && | |
881 | (tbl_type.ant_type == search_tbl->ant_type) && | |
882 | (tbl_type.is_SGI == search_tbl->is_SGI)) { | |
883 | if (search_tbl->expected_tpt) | |
884 | tpt = search_tbl->expected_tpt[rs_index]; | |
885 | else | |
886 | tpt = 0; | |
887 | rs_collect_tx_data(search_win, rs_index, tpt, 1, 0); | |
888 | ||
889 | /* Else if type matches "current/active" table, | |
890 | * add failure to "current/active" history */ | |
891 | } else if ((tbl_type.lq_type == curr_tbl->lq_type) && | |
892 | (tbl_type.ant_type == curr_tbl->ant_type) && | |
893 | (tbl_type.is_SGI == curr_tbl->is_SGI)) { | |
894 | if (curr_tbl->expected_tpt) | |
895 | tpt = curr_tbl->expected_tpt[rs_index]; | |
896 | else | |
897 | tpt = 0; | |
898 | rs_collect_tx_data(window, rs_index, tpt, 1, 0); | |
899 | } | |
900 | ||
901 | /* If not searching for a new mode, increment failed counter | |
902 | * ... this helps determine when to start searching again */ | |
903 | if (lq_sta->stay_in_tbl) | |
904 | lq_sta->total_failed++; | |
905 | --retries; | |
906 | index++; | |
907 | ||
908 | } | |
909 | ||
910 | /* | |
911 | * Find (by rate) the history window to update with final Tx attempt; | |
912 | * if Tx was successful first try, use original rate, | |
913 | * else look up the rate that was, finally, successful. | |
914 | */ | |
915 | tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags); | |
916 | rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index); | |
917 | ||
918 | /* Update frame history window with "success" if Tx got ACKed ... */ | |
919 | status = !!(info->flags & IEEE80211_TX_STAT_ACK); | |
920 | ||
921 | /* If type matches "search" table, | |
922 | * add final tx status to "search" history */ | |
923 | if ((tbl_type.lq_type == search_tbl->lq_type) && | |
924 | (tbl_type.ant_type == search_tbl->ant_type) && | |
925 | (tbl_type.is_SGI == search_tbl->is_SGI)) { | |
926 | if (search_tbl->expected_tpt) | |
927 | tpt = search_tbl->expected_tpt[rs_index]; | |
928 | else | |
929 | tpt = 0; | |
930 | if (info->flags & IEEE80211_TX_CTL_AMPDU) | |
931 | rs_collect_tx_data(search_win, rs_index, tpt, | |
932 | info->status.ampdu_ack_len, | |
933 | info->status.ampdu_ack_map); | |
934 | else | |
935 | rs_collect_tx_data(search_win, rs_index, tpt, | |
936 | 1, status); | |
937 | /* Else if type matches "current/active" table, | |
938 | * add final tx status to "current/active" history */ | |
939 | } else if ((tbl_type.lq_type == curr_tbl->lq_type) && | |
940 | (tbl_type.ant_type == curr_tbl->ant_type) && | |
941 | (tbl_type.is_SGI == curr_tbl->is_SGI)) { | |
942 | if (curr_tbl->expected_tpt) | |
943 | tpt = curr_tbl->expected_tpt[rs_index]; | |
944 | else | |
945 | tpt = 0; | |
946 | if (info->flags & IEEE80211_TX_CTL_AMPDU) | |
947 | rs_collect_tx_data(window, rs_index, tpt, | |
948 | info->status.ampdu_ack_len, | |
949 | info->status.ampdu_ack_map); | |
950 | else | |
951 | rs_collect_tx_data(window, rs_index, tpt, | |
952 | 1, status); | |
953 | } | |
954 | ||
955 | /* If not searching for new mode, increment success/failed counter | |
956 | * ... these help determine when to start searching again */ | |
957 | if (lq_sta->stay_in_tbl) { | |
958 | if (info->flags & IEEE80211_TX_CTL_AMPDU) { | |
959 | lq_sta->total_success += info->status.ampdu_ack_map; | |
960 | lq_sta->total_failed += | |
961 | (info->status.ampdu_ack_len - info->status.ampdu_ack_map); | |
962 | } else { | |
963 | if (status) | |
964 | lq_sta->total_success++; | |
965 | else | |
966 | lq_sta->total_failed++; | |
967 | } | |
968 | } | |
969 | ||
970 | /* See if there's a better rate or modulation mode to try. */ | |
971 | rs_rate_scale_perform(priv, dev, hdr, sta); | |
972 | out: | |
973 | rcu_read_unlock(); | |
974 | return; | |
975 | } | |
976 | ||
977 | /* | |
978 | * Begin a period of staying with a selected modulation mode. | |
979 | * Set "stay_in_tbl" flag to prevent any mode switches. | |
980 | * Set frame tx success limits according to legacy vs. high-throughput, | |
981 | * and reset overall (spanning all rates) tx success history statistics. | |
982 | * These control how long we stay using same modulation mode before | |
983 | * searching for a new mode. | |
984 | */ | |
985 | static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy, | |
986 | struct iwl_lq_sta *lq_sta) | |
987 | { | |
988 | IWL_DEBUG_RATE("we are staying in the same table\n"); | |
989 | lq_sta->stay_in_tbl = 1; /* only place this gets set */ | |
990 | if (is_legacy) { | |
991 | lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT; | |
992 | lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT; | |
993 | lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT; | |
994 | } else { | |
995 | lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT; | |
996 | lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT; | |
997 | lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT; | |
998 | } | |
999 | lq_sta->table_count = 0; | |
1000 | lq_sta->total_failed = 0; | |
1001 | lq_sta->total_success = 0; | |
1002 | } | |
1003 | ||
1004 | /* | |
1005 | * Find correct throughput table for given mode of modulation | |
1006 | */ | |
1007 | static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta, | |
1008 | struct iwl_scale_tbl_info *tbl) | |
1009 | { | |
1010 | if (is_legacy(tbl->lq_type)) { | |
1011 | if (!is_a_band(tbl->lq_type)) | |
1012 | tbl->expected_tpt = expected_tpt_G; | |
1013 | else | |
1014 | tbl->expected_tpt = expected_tpt_A; | |
1015 | } else if (is_siso(tbl->lq_type)) { | |
1016 | if (tbl->is_fat && !lq_sta->is_dup) | |
1017 | if (tbl->is_SGI) | |
1018 | tbl->expected_tpt = expected_tpt_siso40MHzSGI; | |
1019 | else | |
1020 | tbl->expected_tpt = expected_tpt_siso40MHz; | |
1021 | else if (tbl->is_SGI) | |
1022 | tbl->expected_tpt = expected_tpt_siso20MHzSGI; | |
1023 | else | |
1024 | tbl->expected_tpt = expected_tpt_siso20MHz; | |
1025 | ||
1026 | } else if (is_mimo(tbl->lq_type)) { /* FIXME:need to separate mimo2/3 */ | |
1027 | if (tbl->is_fat && !lq_sta->is_dup) | |
1028 | if (tbl->is_SGI) | |
1029 | tbl->expected_tpt = expected_tpt_mimo40MHzSGI; | |
1030 | else | |
1031 | tbl->expected_tpt = expected_tpt_mimo40MHz; | |
1032 | else if (tbl->is_SGI) | |
1033 | tbl->expected_tpt = expected_tpt_mimo20MHzSGI; | |
1034 | else | |
1035 | tbl->expected_tpt = expected_tpt_mimo20MHz; | |
1036 | } else | |
1037 | tbl->expected_tpt = expected_tpt_G; | |
1038 | } | |
1039 | ||
1040 | /* | |
1041 | * Find starting rate for new "search" high-throughput mode of modulation. | |
1042 | * Goal is to find lowest expected rate (under perfect conditions) that is | |
1043 | * above the current measured throughput of "active" mode, to give new mode | |
1044 | * a fair chance to prove itself without too many challenges. | |
1045 | * | |
1046 | * This gets called when transitioning to more aggressive modulation | |
1047 | * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive | |
1048 | * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need | |
1049 | * to decrease to match "active" throughput. When moving from MIMO to SISO, | |
1050 | * bit rate will typically need to increase, but not if performance was bad. | |
1051 | */ | |
1052 | static s32 rs_get_best_rate(struct iwl_priv *priv, | |
1053 | struct iwl_lq_sta *lq_sta, | |
1054 | struct iwl_scale_tbl_info *tbl, /* "search" */ | |
1055 | u16 rate_mask, s8 index) | |
1056 | { | |
1057 | /* "active" values */ | |
1058 | struct iwl_scale_tbl_info *active_tbl = | |
1059 | &(lq_sta->lq_info[lq_sta->active_tbl]); | |
1060 | s32 active_sr = active_tbl->win[index].success_ratio; | |
1061 | s32 active_tpt = active_tbl->expected_tpt[index]; | |
1062 | ||
1063 | /* expected "search" throughput */ | |
1064 | s32 *tpt_tbl = tbl->expected_tpt; | |
1065 | ||
1066 | s32 new_rate, high, low, start_hi; | |
1067 | u16 high_low; | |
1068 | s8 rate = index; | |
1069 | ||
1070 | new_rate = high = low = start_hi = IWL_RATE_INVALID; | |
1071 | ||
1072 | for (; ;) { | |
1073 | high_low = rs_get_adjacent_rate(priv, rate, rate_mask, | |
1074 | tbl->lq_type); | |
1075 | ||
1076 | low = high_low & 0xff; | |
1077 | high = (high_low >> 8) & 0xff; | |
1078 | ||
1079 | /* | |
1080 | * Lower the "search" bit rate, to give new "search" mode | |
1081 | * approximately the same throughput as "active" if: | |
1082 | * | |
1083 | * 1) "Active" mode has been working modestly well (but not | |
1084 | * great), and expected "search" throughput (under perfect | |
1085 | * conditions) at candidate rate is above the actual | |
1086 | * measured "active" throughput (but less than expected | |
1087 | * "active" throughput under perfect conditions). | |
1088 | * OR | |
1089 | * 2) "Active" mode has been working perfectly or very well | |
1090 | * and expected "search" throughput (under perfect | |
1091 | * conditions) at candidate rate is above expected | |
1092 | * "active" throughput (under perfect conditions). | |
1093 | */ | |
1094 | if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) && | |
1095 | ((active_sr > IWL_RATE_DECREASE_TH) && | |
1096 | (active_sr <= IWL_RATE_HIGH_TH) && | |
1097 | (tpt_tbl[rate] <= active_tpt))) || | |
1098 | ((active_sr >= IWL_RATE_SCALE_SWITCH) && | |
1099 | (tpt_tbl[rate] > active_tpt))) { | |
1100 | ||
1101 | /* (2nd or later pass) | |
1102 | * If we've already tried to raise the rate, and are | |
1103 | * now trying to lower it, use the higher rate. */ | |
1104 | if (start_hi != IWL_RATE_INVALID) { | |
1105 | new_rate = start_hi; | |
1106 | break; | |
1107 | } | |
1108 | ||
1109 | new_rate = rate; | |
1110 | ||
1111 | /* Loop again with lower rate */ | |
1112 | if (low != IWL_RATE_INVALID) | |
1113 | rate = low; | |
1114 | ||
1115 | /* Lower rate not available, use the original */ | |
1116 | else | |
1117 | break; | |
1118 | ||
1119 | /* Else try to raise the "search" rate to match "active" */ | |
1120 | } else { | |
1121 | /* (2nd or later pass) | |
1122 | * If we've already tried to lower the rate, and are | |
1123 | * now trying to raise it, use the lower rate. */ | |
1124 | if (new_rate != IWL_RATE_INVALID) | |
1125 | break; | |
1126 | ||
1127 | /* Loop again with higher rate */ | |
1128 | else if (high != IWL_RATE_INVALID) { | |
1129 | start_hi = high; | |
1130 | rate = high; | |
1131 | ||
1132 | /* Higher rate not available, use the original */ | |
1133 | } else { | |
1134 | new_rate = rate; | |
1135 | break; | |
1136 | } | |
1137 | } | |
1138 | } | |
1139 | ||
1140 | return new_rate; | |
1141 | } | |
1142 | ||
1143 | /* | |
1144 | * Set up search table for MIMO | |
1145 | */ | |
1146 | static int rs_switch_to_mimo2(struct iwl_priv *priv, | |
1147 | struct iwl_lq_sta *lq_sta, | |
1148 | struct ieee80211_conf *conf, | |
1149 | struct sta_info *sta, | |
1150 | struct iwl_scale_tbl_info *tbl, int index) | |
1151 | { | |
1152 | u16 rate_mask; | |
1153 | s32 rate; | |
1154 | s8 is_green = lq_sta->is_green; | |
1155 | ||
1156 | if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) || | |
1157 | !sta->sta.ht_info.ht_supported) | |
1158 | return -1; | |
1159 | ||
1160 | if (((sta->sta.ht_info.cap & IEEE80211_HT_CAP_SM_PS) >> 2) | |
1161 | == WLAN_HT_CAP_SM_PS_STATIC) | |
1162 | return -1; | |
1163 | ||
1164 | /* Need both Tx chains/antennas to support MIMO */ | |
1165 | if (priv->hw_params.tx_chains_num < 2) | |
1166 | return -1; | |
1167 | ||
1168 | IWL_DEBUG_RATE("LQ: try to switch to MIMO2\n"); | |
1169 | ||
1170 | tbl->lq_type = LQ_MIMO2; | |
1171 | tbl->is_dup = lq_sta->is_dup; | |
1172 | tbl->action = 0; | |
1173 | rate_mask = lq_sta->active_mimo2_rate; | |
1174 | ||
1175 | if (priv->current_ht_config.supported_chan_width | |
1176 | == IWL_CHANNEL_WIDTH_40MHZ) | |
1177 | tbl->is_fat = 1; | |
1178 | else | |
1179 | tbl->is_fat = 0; | |
1180 | ||
1181 | /* FIXME: - don't toggle SGI here | |
1182 | if (tbl->is_fat) { | |
1183 | if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY) | |
1184 | tbl->is_SGI = 1; | |
1185 | else | |
1186 | tbl->is_SGI = 0; | |
1187 | } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY) | |
1188 | tbl->is_SGI = 1; | |
1189 | else | |
1190 | tbl->is_SGI = 0; | |
1191 | */ | |
1192 | ||
1193 | rs_set_expected_tpt_table(lq_sta, tbl); | |
1194 | ||
1195 | rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index); | |
1196 | ||
1197 | IWL_DEBUG_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask); | |
1198 | ||
1199 | if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) { | |
1200 | IWL_DEBUG_RATE("Can't switch with index %d rate mask %x\n", | |
1201 | rate, rate_mask); | |
1202 | return -1; | |
1203 | } | |
1204 | tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green); | |
1205 | ||
1206 | IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n", | |
1207 | tbl->current_rate, is_green); | |
1208 | return 0; | |
1209 | } | |
1210 | ||
1211 | /* | |
1212 | * Set up search table for SISO | |
1213 | */ | |
1214 | static int rs_switch_to_siso(struct iwl_priv *priv, | |
1215 | struct iwl_lq_sta *lq_sta, | |
1216 | struct ieee80211_conf *conf, | |
1217 | struct sta_info *sta, | |
1218 | struct iwl_scale_tbl_info *tbl, int index) | |
1219 | { | |
1220 | u16 rate_mask; | |
1221 | u8 is_green = lq_sta->is_green; | |
1222 | s32 rate; | |
1223 | ||
1224 | if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) || | |
1225 | !sta->sta.ht_info.ht_supported) | |
1226 | return -1; | |
1227 | ||
1228 | IWL_DEBUG_RATE("LQ: try to switch to SISO\n"); | |
1229 | ||
1230 | tbl->is_dup = lq_sta->is_dup; | |
1231 | tbl->lq_type = LQ_SISO; | |
1232 | tbl->action = 0; | |
1233 | rate_mask = lq_sta->active_siso_rate; | |
1234 | ||
1235 | if (priv->current_ht_config.supported_chan_width | |
1236 | == IWL_CHANNEL_WIDTH_40MHZ) | |
1237 | tbl->is_fat = 1; | |
1238 | else | |
1239 | tbl->is_fat = 0; | |
1240 | ||
1241 | /* FIXME: - don't toggle SGI here | |
1242 | if (tbl->is_fat) { | |
1243 | if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY) | |
1244 | tbl->is_SGI = 1; | |
1245 | else | |
1246 | tbl->is_SGI = 0; | |
1247 | } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY) | |
1248 | tbl->is_SGI = 1; | |
1249 | else | |
1250 | tbl->is_SGI = 0; | |
1251 | */ | |
1252 | ||
1253 | if (is_green) | |
1254 | tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/ | |
1255 | ||
1256 | rs_set_expected_tpt_table(lq_sta, tbl); | |
1257 | rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index); | |
1258 | ||
1259 | IWL_DEBUG_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask); | |
1260 | if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) { | |
1261 | IWL_DEBUG_RATE("can not switch with index %d rate mask %x\n", | |
1262 | rate, rate_mask); | |
1263 | return -1; | |
1264 | } | |
1265 | tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green); | |
1266 | IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n", | |
1267 | tbl->current_rate, is_green); | |
1268 | return 0; | |
1269 | } | |
1270 | ||
1271 | /* | |
1272 | * Try to switch to new modulation mode from legacy | |
1273 | */ | |
1274 | static int rs_move_legacy_other(struct iwl_priv *priv, | |
1275 | struct iwl_lq_sta *lq_sta, | |
1276 | struct ieee80211_conf *conf, | |
1277 | struct sta_info *sta, | |
1278 | int index) | |
1279 | { | |
1280 | struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); | |
1281 | struct iwl_scale_tbl_info *search_tbl = | |
1282 | &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); | |
1283 | struct iwl_rate_scale_data *window = &(tbl->win[index]); | |
1284 | u32 sz = (sizeof(struct iwl_scale_tbl_info) - | |
1285 | (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); | |
1286 | u8 start_action = tbl->action; | |
1287 | u8 valid_tx_ant = priv->hw_params.valid_tx_ant; | |
1288 | u8 tx_chains_num = priv->hw_params.tx_chains_num; | |
1289 | int ret = 0; | |
1290 | ||
1291 | for (; ;) { | |
1292 | switch (tbl->action) { | |
1293 | case IWL_LEGACY_SWITCH_ANTENNA1: | |
1294 | case IWL_LEGACY_SWITCH_ANTENNA2: | |
1295 | IWL_DEBUG_RATE("LQ: Legacy toggle Antenna\n"); | |
1296 | ||
1297 | lq_sta->action_counter++; | |
1298 | ||
1299 | if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 && | |
1300 | tx_chains_num <= 1) || | |
1301 | (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 && | |
1302 | tx_chains_num <= 2)) | |
1303 | break; | |
1304 | ||
1305 | /* Don't change antenna if success has been great */ | |
1306 | if (window->success_ratio >= IWL_RS_GOOD_RATIO) | |
1307 | break; | |
1308 | ||
1309 | /* Set up search table to try other antenna */ | |
1310 | memcpy(search_tbl, tbl, sz); | |
1311 | ||
1312 | if (rs_toggle_antenna(valid_tx_ant, | |
1313 | &search_tbl->current_rate, search_tbl)) { | |
1314 | rs_set_expected_tpt_table(lq_sta, search_tbl); | |
1315 | goto out; | |
1316 | } | |
1317 | break; | |
1318 | case IWL_LEGACY_SWITCH_SISO: | |
1319 | IWL_DEBUG_RATE("LQ: Legacy switch to SISO\n"); | |
1320 | ||
1321 | /* Set up search table to try SISO */ | |
1322 | memcpy(search_tbl, tbl, sz); | |
1323 | search_tbl->is_SGI = 0; | |
1324 | ret = rs_switch_to_siso(priv, lq_sta, conf, sta, | |
1325 | search_tbl, index); | |
1326 | if (!ret) { | |
1327 | lq_sta->action_counter = 0; | |
1328 | goto out; | |
1329 | } | |
1330 | ||
1331 | break; | |
1332 | case IWL_LEGACY_SWITCH_MIMO2_AB: | |
1333 | case IWL_LEGACY_SWITCH_MIMO2_AC: | |
1334 | case IWL_LEGACY_SWITCH_MIMO2_BC: | |
1335 | IWL_DEBUG_RATE("LQ: Legacy switch to MIMO2\n"); | |
1336 | ||
1337 | /* Set up search table to try MIMO */ | |
1338 | memcpy(search_tbl, tbl, sz); | |
1339 | search_tbl->is_SGI = 0; | |
1340 | ||
1341 | if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB) | |
1342 | search_tbl->ant_type = ANT_AB; | |
1343 | else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC) | |
1344 | search_tbl->ant_type = ANT_AC; | |
1345 | else | |
1346 | search_tbl->ant_type = ANT_BC; | |
1347 | ||
1348 | if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) | |
1349 | break; | |
1350 | ||
1351 | ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta, | |
1352 | search_tbl, index); | |
1353 | if (!ret) { | |
1354 | lq_sta->action_counter = 0; | |
1355 | goto out; | |
1356 | } | |
1357 | break; | |
1358 | } | |
1359 | tbl->action++; | |
1360 | if (tbl->action > IWL_LEGACY_SWITCH_MIMO2_BC) | |
1361 | tbl->action = IWL_LEGACY_SWITCH_ANTENNA1; | |
1362 | ||
1363 | if (tbl->action == start_action) | |
1364 | break; | |
1365 | ||
1366 | } | |
1367 | search_tbl->lq_type = LQ_NONE; | |
1368 | return 0; | |
1369 | ||
1370 | out: | |
1371 | lq_sta->search_better_tbl = 1; | |
1372 | tbl->action++; | |
1373 | if (tbl->action > IWL_LEGACY_SWITCH_MIMO2_BC) | |
1374 | tbl->action = IWL_LEGACY_SWITCH_ANTENNA1; | |
1375 | return 0; | |
1376 | ||
1377 | } | |
1378 | ||
1379 | /* | |
1380 | * Try to switch to new modulation mode from SISO | |
1381 | */ | |
1382 | static int rs_move_siso_to_other(struct iwl_priv *priv, | |
1383 | struct iwl_lq_sta *lq_sta, | |
1384 | struct ieee80211_conf *conf, | |
1385 | struct sta_info *sta, int index) | |
1386 | { | |
1387 | u8 is_green = lq_sta->is_green; | |
1388 | struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); | |
1389 | struct iwl_scale_tbl_info *search_tbl = | |
1390 | &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); | |
1391 | struct iwl_rate_scale_data *window = &(tbl->win[index]); | |
1392 | u32 sz = (sizeof(struct iwl_scale_tbl_info) - | |
1393 | (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); | |
1394 | u8 start_action = tbl->action; | |
1395 | u8 valid_tx_ant = priv->hw_params.valid_tx_ant; | |
1396 | u8 tx_chains_num = priv->hw_params.tx_chains_num; | |
1397 | int ret; | |
1398 | ||
1399 | for (;;) { | |
1400 | lq_sta->action_counter++; | |
1401 | switch (tbl->action) { | |
1402 | case IWL_SISO_SWITCH_ANTENNA1: | |
1403 | case IWL_SISO_SWITCH_ANTENNA2: | |
1404 | IWL_DEBUG_RATE("LQ: SISO toggle Antenna\n"); | |
1405 | ||
1406 | if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 && | |
1407 | tx_chains_num <= 1) || | |
1408 | (tbl->action == IWL_SISO_SWITCH_ANTENNA2 && | |
1409 | tx_chains_num <= 2)) | |
1410 | break; | |
1411 | ||
1412 | if (window->success_ratio >= IWL_RS_GOOD_RATIO) | |
1413 | break; | |
1414 | ||
1415 | memcpy(search_tbl, tbl, sz); | |
1416 | if (rs_toggle_antenna(valid_tx_ant, | |
1417 | &search_tbl->current_rate, search_tbl)) | |
1418 | goto out; | |
1419 | break; | |
1420 | case IWL_SISO_SWITCH_MIMO2_AB: | |
1421 | case IWL_SISO_SWITCH_MIMO2_AC: | |
1422 | case IWL_SISO_SWITCH_MIMO2_BC: | |
1423 | IWL_DEBUG_RATE("LQ: SISO switch to MIMO2\n"); | |
1424 | memcpy(search_tbl, tbl, sz); | |
1425 | search_tbl->is_SGI = 0; | |
1426 | ||
1427 | if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB) | |
1428 | search_tbl->ant_type = ANT_AB; | |
1429 | else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC) | |
1430 | search_tbl->ant_type = ANT_AC; | |
1431 | else | |
1432 | search_tbl->ant_type = ANT_BC; | |
1433 | ||
1434 | if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) | |
1435 | break; | |
1436 | ||
1437 | ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta, | |
1438 | search_tbl, index); | |
1439 | if (!ret) | |
1440 | goto out; | |
1441 | break; | |
1442 | case IWL_SISO_SWITCH_GI: | |
1443 | if (!tbl->is_fat && | |
1444 | !(priv->current_ht_config.sgf & | |
1445 | HT_SHORT_GI_20MHZ)) | |
1446 | break; | |
1447 | if (tbl->is_fat && | |
1448 | !(priv->current_ht_config.sgf & | |
1449 | HT_SHORT_GI_40MHZ)) | |
1450 | break; | |
1451 | ||
1452 | IWL_DEBUG_RATE("LQ: SISO toggle SGI/NGI\n"); | |
1453 | ||
1454 | memcpy(search_tbl, tbl, sz); | |
1455 | if (is_green) { | |
1456 | if (!tbl->is_SGI) | |
1457 | break; | |
1458 | else | |
1459 | IWL_ERROR("SGI was set in GF+SISO\n"); | |
1460 | } | |
1461 | search_tbl->is_SGI = !tbl->is_SGI; | |
1462 | rs_set_expected_tpt_table(lq_sta, search_tbl); | |
1463 | if (tbl->is_SGI) { | |
1464 | s32 tpt = lq_sta->last_tpt / 100; | |
1465 | if (tpt >= search_tbl->expected_tpt[index]) | |
1466 | break; | |
1467 | } | |
1468 | search_tbl->current_rate = rate_n_flags_from_tbl( | |
1469 | search_tbl, index, is_green); | |
1470 | goto out; | |
1471 | } | |
1472 | tbl->action++; | |
1473 | if (tbl->action > IWL_SISO_SWITCH_GI) | |
1474 | tbl->action = IWL_SISO_SWITCH_ANTENNA1; | |
1475 | ||
1476 | if (tbl->action == start_action) | |
1477 | break; | |
1478 | } | |
1479 | search_tbl->lq_type = LQ_NONE; | |
1480 | return 0; | |
1481 | ||
1482 | out: | |
1483 | lq_sta->search_better_tbl = 1; | |
1484 | tbl->action++; | |
1485 | if (tbl->action > IWL_SISO_SWITCH_GI) | |
1486 | tbl->action = IWL_SISO_SWITCH_ANTENNA1; | |
1487 | return 0; | |
1488 | } | |
1489 | ||
1490 | /* | |
1491 | * Try to switch to new modulation mode from MIMO | |
1492 | */ | |
1493 | static int rs_move_mimo_to_other(struct iwl_priv *priv, | |
1494 | struct iwl_lq_sta *lq_sta, | |
1495 | struct ieee80211_conf *conf, | |
1496 | struct sta_info *sta, int index) | |
1497 | { | |
1498 | s8 is_green = lq_sta->is_green; | |
1499 | struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); | |
1500 | struct iwl_scale_tbl_info *search_tbl = | |
1501 | &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); | |
1502 | struct iwl_rate_scale_data *window = &(tbl->win[index]); | |
1503 | u32 sz = (sizeof(struct iwl_scale_tbl_info) - | |
1504 | (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); | |
1505 | u8 start_action = tbl->action; | |
1506 | u8 valid_tx_ant = priv->hw_params.valid_tx_ant; | |
1507 | u8 tx_chains_num = priv->hw_params.tx_chains_num; | |
1508 | int ret; | |
1509 | ||
1510 | for (;;) { | |
1511 | lq_sta->action_counter++; | |
1512 | switch (tbl->action) { | |
1513 | case IWL_MIMO2_SWITCH_ANTENNA1: | |
1514 | case IWL_MIMO2_SWITCH_ANTENNA2: | |
1515 | IWL_DEBUG_RATE("LQ: MIMO toggle Antennas\n"); | |
1516 | ||
1517 | if (tx_chains_num <= 2) | |
1518 | break; | |
1519 | ||
1520 | if (window->success_ratio >= IWL_RS_GOOD_RATIO) | |
1521 | break; | |
1522 | ||
1523 | memcpy(search_tbl, tbl, sz); | |
1524 | if (rs_toggle_antenna(valid_tx_ant, | |
1525 | &search_tbl->current_rate, search_tbl)) | |
1526 | goto out; | |
1527 | break; | |
1528 | case IWL_MIMO2_SWITCH_SISO_A: | |
1529 | case IWL_MIMO2_SWITCH_SISO_B: | |
1530 | case IWL_MIMO2_SWITCH_SISO_C: | |
1531 | IWL_DEBUG_RATE("LQ: MIMO2 switch to SISO\n"); | |
1532 | ||
1533 | /* Set up new search table for SISO */ | |
1534 | memcpy(search_tbl, tbl, sz); | |
1535 | ||
1536 | if (tbl->action == IWL_MIMO2_SWITCH_SISO_A) | |
1537 | search_tbl->ant_type = ANT_A; | |
1538 | else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B) | |
1539 | search_tbl->ant_type = ANT_B; | |
1540 | else | |
1541 | search_tbl->ant_type = ANT_C; | |
1542 | ||
1543 | if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) | |
1544 | break; | |
1545 | ||
1546 | ret = rs_switch_to_siso(priv, lq_sta, conf, sta, | |
1547 | search_tbl, index); | |
1548 | if (!ret) | |
1549 | goto out; | |
1550 | ||
1551 | break; | |
1552 | ||
1553 | case IWL_MIMO2_SWITCH_GI: | |
1554 | if (!tbl->is_fat && | |
1555 | !(priv->current_ht_config.sgf & | |
1556 | HT_SHORT_GI_20MHZ)) | |
1557 | break; | |
1558 | if (tbl->is_fat && | |
1559 | !(priv->current_ht_config.sgf & | |
1560 | HT_SHORT_GI_40MHZ)) | |
1561 | break; | |
1562 | ||
1563 | IWL_DEBUG_RATE("LQ: MIMO toggle SGI/NGI\n"); | |
1564 | ||
1565 | /* Set up new search table for MIMO */ | |
1566 | memcpy(search_tbl, tbl, sz); | |
1567 | search_tbl->is_SGI = !tbl->is_SGI; | |
1568 | rs_set_expected_tpt_table(lq_sta, search_tbl); | |
1569 | /* | |
1570 | * If active table already uses the fastest possible | |
1571 | * modulation (dual stream with short guard interval), | |
1572 | * and it's working well, there's no need to look | |
1573 | * for a better type of modulation! | |
1574 | */ | |
1575 | if (tbl->is_SGI) { | |
1576 | s32 tpt = lq_sta->last_tpt / 100; | |
1577 | if (tpt >= search_tbl->expected_tpt[index]) | |
1578 | break; | |
1579 | } | |
1580 | search_tbl->current_rate = rate_n_flags_from_tbl( | |
1581 | search_tbl, index, is_green); | |
1582 | goto out; | |
1583 | ||
1584 | } | |
1585 | tbl->action++; | |
1586 | if (tbl->action > IWL_MIMO2_SWITCH_GI) | |
1587 | tbl->action = IWL_MIMO2_SWITCH_ANTENNA1; | |
1588 | ||
1589 | if (tbl->action == start_action) | |
1590 | break; | |
1591 | } | |
1592 | search_tbl->lq_type = LQ_NONE; | |
1593 | return 0; | |
1594 | out: | |
1595 | lq_sta->search_better_tbl = 1; | |
1596 | tbl->action++; | |
1597 | if (tbl->action > IWL_MIMO2_SWITCH_GI) | |
1598 | tbl->action = IWL_MIMO2_SWITCH_ANTENNA1; | |
1599 | return 0; | |
1600 | ||
1601 | } | |
1602 | ||
1603 | /* | |
1604 | * Check whether we should continue using same modulation mode, or | |
1605 | * begin search for a new mode, based on: | |
1606 | * 1) # tx successes or failures while using this mode | |
1607 | * 2) # times calling this function | |
1608 | * 3) elapsed time in this mode (not used, for now) | |
1609 | */ | |
1610 | static void rs_stay_in_table(struct iwl_lq_sta *lq_sta) | |
1611 | { | |
1612 | struct iwl_scale_tbl_info *tbl; | |
1613 | int i; | |
1614 | int active_tbl; | |
1615 | int flush_interval_passed = 0; | |
1616 | struct iwl_priv *priv; | |
1617 | ||
1618 | priv = lq_sta->drv; | |
1619 | active_tbl = lq_sta->active_tbl; | |
1620 | ||
1621 | tbl = &(lq_sta->lq_info[active_tbl]); | |
1622 | ||
1623 | /* If we've been disallowing search, see if we should now allow it */ | |
1624 | if (lq_sta->stay_in_tbl) { | |
1625 | ||
1626 | /* Elapsed time using current modulation mode */ | |
1627 | if (lq_sta->flush_timer) | |
1628 | flush_interval_passed = | |
1629 | time_after(jiffies, | |
1630 | (unsigned long)(lq_sta->flush_timer + | |
1631 | IWL_RATE_SCALE_FLUSH_INTVL)); | |
1632 | ||
1633 | /* | |
1634 | * Check if we should allow search for new modulation mode. | |
1635 | * If many frames have failed or succeeded, or we've used | |
1636 | * this same modulation for a long time, allow search, and | |
1637 | * reset history stats that keep track of whether we should | |
1638 | * allow a new search. Also (below) reset all bitmaps and | |
1639 | * stats in active history. | |
1640 | */ | |
1641 | if ((lq_sta->total_failed > lq_sta->max_failure_limit) || | |
1642 | (lq_sta->total_success > lq_sta->max_success_limit) || | |
1643 | ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer) | |
1644 | && (flush_interval_passed))) { | |
1645 | IWL_DEBUG_RATE("LQ: stay is expired %d %d %d\n:", | |
1646 | lq_sta->total_failed, | |
1647 | lq_sta->total_success, | |
1648 | flush_interval_passed); | |
1649 | ||
1650 | /* Allow search for new mode */ | |
1651 | lq_sta->stay_in_tbl = 0; /* only place reset */ | |
1652 | lq_sta->total_failed = 0; | |
1653 | lq_sta->total_success = 0; | |
1654 | lq_sta->flush_timer = 0; | |
1655 | ||
1656 | /* | |
1657 | * Else if we've used this modulation mode enough repetitions | |
1658 | * (regardless of elapsed time or success/failure), reset | |
1659 | * history bitmaps and rate-specific stats for all rates in | |
1660 | * active table. | |
1661 | */ | |
1662 | } else { | |
1663 | lq_sta->table_count++; | |
1664 | if (lq_sta->table_count >= | |
1665 | lq_sta->table_count_limit) { | |
1666 | lq_sta->table_count = 0; | |
1667 | ||
1668 | IWL_DEBUG_RATE("LQ: stay in table clear win\n"); | |
1669 | for (i = 0; i < IWL_RATE_COUNT; i++) | |
1670 | rs_rate_scale_clear_window( | |
1671 | &(tbl->win[i])); | |
1672 | } | |
1673 | } | |
1674 | ||
1675 | /* If transitioning to allow "search", reset all history | |
1676 | * bitmaps and stats in active table (this will become the new | |
1677 | * "search" table). */ | |
1678 | if (!lq_sta->stay_in_tbl) { | |
1679 | for (i = 0; i < IWL_RATE_COUNT; i++) | |
1680 | rs_rate_scale_clear_window(&(tbl->win[i])); | |
1681 | } | |
1682 | } | |
1683 | } | |
1684 | ||
1685 | /* | |
1686 | * Do rate scaling and search for new modulation mode. | |
1687 | */ | |
1688 | static void rs_rate_scale_perform(struct iwl_priv *priv, | |
1689 | struct net_device *dev, | |
1690 | struct ieee80211_hdr *hdr, | |
1691 | struct sta_info *sta) | |
1692 | { | |
1693 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
1694 | struct ieee80211_hw *hw = local_to_hw(local); | |
1695 | struct ieee80211_conf *conf = &hw->conf; | |
1696 | int low = IWL_RATE_INVALID; | |
1697 | int high = IWL_RATE_INVALID; | |
1698 | int index; | |
1699 | int i; | |
1700 | struct iwl_rate_scale_data *window = NULL; | |
1701 | int current_tpt = IWL_INVALID_VALUE; | |
1702 | int low_tpt = IWL_INVALID_VALUE; | |
1703 | int high_tpt = IWL_INVALID_VALUE; | |
1704 | u32 fail_count; | |
1705 | s8 scale_action = 0; | |
1706 | __le16 fc; | |
1707 | u16 rate_mask; | |
1708 | u8 update_lq = 0; | |
1709 | struct iwl_lq_sta *lq_sta; | |
1710 | struct iwl_scale_tbl_info *tbl, *tbl1; | |
1711 | u16 rate_scale_index_msk = 0; | |
1712 | u32 rate; | |
1713 | u8 is_green = 0; | |
1714 | u8 active_tbl = 0; | |
1715 | u8 done_search = 0; | |
1716 | u16 high_low; | |
1717 | s32 sr; | |
1718 | u8 tid = MAX_TID_COUNT; | |
1719 | ||
1720 | IWL_DEBUG_RATE("rate scale calculate new rate for skb\n"); | |
1721 | ||
1722 | fc = hdr->frame_control; | |
1723 | if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) { | |
1724 | /* Send management frames and broadcast/multicast data using | |
1725 | * lowest rate. */ | |
1726 | /* TODO: this could probably be improved.. */ | |
1727 | return; | |
1728 | } | |
1729 | ||
1730 | if (!sta || !sta->rate_ctrl_priv) | |
1731 | return; | |
1732 | ||
1733 | lq_sta = (struct iwl_lq_sta *)sta->rate_ctrl_priv; | |
1734 | lq_sta->supp_rates = sta->sta.supp_rates[lq_sta->band]; | |
1735 | ||
1736 | tid = rs_tl_add_packet(lq_sta, hdr); | |
1737 | ||
1738 | /* | |
1739 | * Select rate-scale / modulation-mode table to work with in | |
1740 | * the rest of this function: "search" if searching for better | |
1741 | * modulation mode, or "active" if doing rate scaling within a mode. | |
1742 | */ | |
1743 | if (!lq_sta->search_better_tbl) | |
1744 | active_tbl = lq_sta->active_tbl; | |
1745 | else | |
1746 | active_tbl = 1 - lq_sta->active_tbl; | |
1747 | ||
1748 | tbl = &(lq_sta->lq_info[active_tbl]); | |
1749 | is_green = lq_sta->is_green; | |
1750 | ||
1751 | /* current tx rate */ | |
1752 | index = lq_sta->last_txrate_idx; | |
1753 | ||
1754 | IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index, | |
1755 | tbl->lq_type); | |
1756 | ||
1757 | /* rates available for this association, and for modulation mode */ | |
1758 | rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type); | |
1759 | ||
1760 | IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask); | |
1761 | ||
1762 | /* mask with station rate restriction */ | |
1763 | if (is_legacy(tbl->lq_type)) { | |
1764 | if (lq_sta->band == IEEE80211_BAND_5GHZ) | |
1765 | /* supp_rates has no CCK bits in A mode */ | |
1766 | rate_scale_index_msk = (u16) (rate_mask & | |
1767 | (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE)); | |
1768 | else | |
1769 | rate_scale_index_msk = (u16) (rate_mask & | |
1770 | lq_sta->supp_rates); | |
1771 | ||
1772 | } else | |
1773 | rate_scale_index_msk = rate_mask; | |
1774 | ||
1775 | if (!rate_scale_index_msk) | |
1776 | rate_scale_index_msk = rate_mask; | |
1777 | ||
1778 | if (!((1 << index) & rate_scale_index_msk)) { | |
1779 | IWL_ERROR("Current Rate is not valid\n"); | |
1780 | return; | |
1781 | } | |
1782 | ||
1783 | /* Get expected throughput table and history window for current rate */ | |
1784 | if (!tbl->expected_tpt) { | |
1785 | IWL_ERROR("tbl->expected_tpt is NULL\n"); | |
1786 | return; | |
1787 | } | |
1788 | ||
1789 | window = &(tbl->win[index]); | |
1790 | ||
1791 | /* | |
1792 | * If there is not enough history to calculate actual average | |
1793 | * throughput, keep analyzing results of more tx frames, without | |
1794 | * changing rate or mode (bypass most of the rest of this function). | |
1795 | * Set up new rate table in uCode only if old rate is not supported | |
1796 | * in current association (use new rate found above). | |
1797 | */ | |
1798 | fail_count = window->counter - window->success_counter; | |
1799 | if ((fail_count < IWL_RATE_MIN_FAILURE_TH) && | |
1800 | (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) { | |
1801 | IWL_DEBUG_RATE("LQ: still below TH. succ=%d total=%d " | |
1802 | "for index %d\n", | |
1803 | window->success_counter, window->counter, index); | |
1804 | ||
1805 | /* Can't calculate this yet; not enough history */ | |
1806 | window->average_tpt = IWL_INVALID_VALUE; | |
1807 | ||
1808 | /* Should we stay with this modulation mode, | |
1809 | * or search for a new one? */ | |
1810 | rs_stay_in_table(lq_sta); | |
1811 | ||
1812 | goto out; | |
1813 | } | |
1814 | ||
1815 | /* Else we have enough samples; calculate estimate of | |
1816 | * actual average throughput */ | |
1817 | ||
1818 | BUG_ON(window->average_tpt != ((window->success_ratio * | |
1819 | tbl->expected_tpt[index] + 64) / 128)); | |
1820 | ||
1821 | /* If we are searching for better modulation mode, check success. */ | |
1822 | if (lq_sta->search_better_tbl) { | |
1823 | ||
1824 | /* If good success, continue using the "search" mode; | |
1825 | * no need to send new link quality command, since we're | |
1826 | * continuing to use the setup that we've been trying. */ | |
1827 | if (window->average_tpt > lq_sta->last_tpt) { | |
1828 | ||
1829 | IWL_DEBUG_RATE("LQ: SWITCHING TO NEW TABLE " | |
1830 | "suc=%d cur-tpt=%d old-tpt=%d\n", | |
1831 | window->success_ratio, | |
1832 | window->average_tpt, | |
1833 | lq_sta->last_tpt); | |
1834 | ||
1835 | if (!is_legacy(tbl->lq_type)) | |
1836 | lq_sta->enable_counter = 1; | |
1837 | ||
1838 | /* Swap tables; "search" becomes "active" */ | |
1839 | lq_sta->active_tbl = active_tbl; | |
1840 | current_tpt = window->average_tpt; | |
1841 | ||
1842 | /* Else poor success; go back to mode in "active" table */ | |
1843 | } else { | |
1844 | ||
1845 | IWL_DEBUG_RATE("LQ: GOING BACK TO THE OLD TABLE " | |
1846 | "suc=%d cur-tpt=%d old-tpt=%d\n", | |
1847 | window->success_ratio, | |
1848 | window->average_tpt, | |
1849 | lq_sta->last_tpt); | |
1850 | ||
1851 | /* Nullify "search" table */ | |
1852 | tbl->lq_type = LQ_NONE; | |
1853 | ||
1854 | /* Revert to "active" table */ | |
1855 | active_tbl = lq_sta->active_tbl; | |
1856 | tbl = &(lq_sta->lq_info[active_tbl]); | |
1857 | ||
1858 | /* Revert to "active" rate and throughput info */ | |
1859 | index = iwl_hwrate_to_plcp_idx(tbl->current_rate); | |
1860 | current_tpt = lq_sta->last_tpt; | |
1861 | ||
1862 | /* Need to set up a new rate table in uCode */ | |
1863 | update_lq = 1; | |
1864 | } | |
1865 | ||
1866 | /* Either way, we've made a decision; modulation mode | |
1867 | * search is done, allow rate adjustment next time. */ | |
1868 | lq_sta->search_better_tbl = 0; | |
1869 | done_search = 1; /* Don't switch modes below! */ | |
1870 | goto lq_update; | |
1871 | } | |
1872 | ||
1873 | /* (Else) not in search of better modulation mode, try for better | |
1874 | * starting rate, while staying in this mode. */ | |
1875 | high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk, | |
1876 | tbl->lq_type); | |
1877 | low = high_low & 0xff; | |
1878 | high = (high_low >> 8) & 0xff; | |
1879 | ||
1880 | sr = window->success_ratio; | |
1881 | ||
1882 | /* Collect measured throughputs for current and adjacent rates */ | |
1883 | current_tpt = window->average_tpt; | |
1884 | if (low != IWL_RATE_INVALID) | |
1885 | low_tpt = tbl->win[low].average_tpt; | |
1886 | if (high != IWL_RATE_INVALID) | |
1887 | high_tpt = tbl->win[high].average_tpt; | |
1888 | ||
1889 | scale_action = 0; | |
1890 | ||
1891 | /* Too many failures, decrease rate */ | |
1892 | if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) { | |
1893 | IWL_DEBUG_RATE("decrease rate because of low success_ratio\n"); | |
1894 | scale_action = -1; | |
1895 | ||
1896 | /* No throughput measured yet for adjacent rates; try increase. */ | |
1897 | } else if ((low_tpt == IWL_INVALID_VALUE) && | |
1898 | (high_tpt == IWL_INVALID_VALUE)) { | |
1899 | ||
1900 | if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH) | |
1901 | scale_action = 1; | |
1902 | else if (low != IWL_RATE_INVALID) | |
1903 | scale_action = -1; | |
1904 | } | |
1905 | ||
1906 | /* Both adjacent throughputs are measured, but neither one has better | |
1907 | * throughput; we're using the best rate, don't change it! */ | |
1908 | else if ((low_tpt != IWL_INVALID_VALUE) && | |
1909 | (high_tpt != IWL_INVALID_VALUE) && | |
1910 | (low_tpt < current_tpt) && | |
1911 | (high_tpt < current_tpt)) | |
1912 | scale_action = 0; | |
1913 | ||
1914 | /* At least one adjacent rate's throughput is measured, | |
1915 | * and may have better performance. */ | |
1916 | else { | |
1917 | /* Higher adjacent rate's throughput is measured */ | |
1918 | if (high_tpt != IWL_INVALID_VALUE) { | |
1919 | /* Higher rate has better throughput */ | |
1920 | if (high_tpt > current_tpt && | |
1921 | sr >= IWL_RATE_INCREASE_TH) { | |
1922 | scale_action = 1; | |
1923 | } else { | |
1924 | IWL_DEBUG_RATE | |
1925 | ("decrease rate because of high tpt\n"); | |
1926 | scale_action = -1; | |
1927 | } | |
1928 | ||
1929 | /* Lower adjacent rate's throughput is measured */ | |
1930 | } else if (low_tpt != IWL_INVALID_VALUE) { | |
1931 | /* Lower rate has better throughput */ | |
1932 | if (low_tpt > current_tpt) { | |
1933 | IWL_DEBUG_RATE | |
1934 | ("decrease rate because of low tpt\n"); | |
1935 | scale_action = -1; | |
1936 | } else if (sr >= IWL_RATE_INCREASE_TH) { | |
1937 | scale_action = 1; | |
1938 | } | |
1939 | } | |
1940 | } | |
1941 | ||
1942 | /* Sanity check; asked for decrease, but success rate or throughput | |
1943 | * has been good at old rate. Don't change it. */ | |
1944 | if ((scale_action == -1) && (low != IWL_RATE_INVALID) && | |
1945 | ((sr > IWL_RATE_HIGH_TH) || | |
1946 | (current_tpt > (100 * tbl->expected_tpt[low])))) | |
1947 | scale_action = 0; | |
1948 | ||
1949 | switch (scale_action) { | |
1950 | case -1: | |
1951 | /* Decrease starting rate, update uCode's rate table */ | |
1952 | if (low != IWL_RATE_INVALID) { | |
1953 | update_lq = 1; | |
1954 | index = low; | |
1955 | } | |
1956 | break; | |
1957 | case 1: | |
1958 | /* Increase starting rate, update uCode's rate table */ | |
1959 | if (high != IWL_RATE_INVALID) { | |
1960 | update_lq = 1; | |
1961 | index = high; | |
1962 | } | |
1963 | ||
1964 | break; | |
1965 | case 0: | |
1966 | /* No change */ | |
1967 | default: | |
1968 | break; | |
1969 | } | |
1970 | ||
1971 | IWL_DEBUG_RATE("choose rate scale index %d action %d low %d " | |
1972 | "high %d type %d\n", | |
1973 | index, scale_action, low, high, tbl->lq_type); | |
1974 | ||
1975 | lq_update: | |
1976 | /* Replace uCode's rate table for the destination station. */ | |
1977 | if (update_lq) { | |
1978 | rate = rate_n_flags_from_tbl(tbl, index, is_green); | |
1979 | rs_fill_link_cmd(priv, lq_sta, rate); | |
1980 | iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC); | |
1981 | } | |
1982 | ||
1983 | /* Should we stay with this modulation mode, or search for a new one? */ | |
1984 | rs_stay_in_table(lq_sta); | |
1985 | ||
1986 | /* | |
1987 | * Search for new modulation mode if we're: | |
1988 | * 1) Not changing rates right now | |
1989 | * 2) Not just finishing up a search | |
1990 | * 3) Allowing a new search | |
1991 | */ | |
1992 | if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) { | |
1993 | /* Save current throughput to compare with "search" throughput*/ | |
1994 | lq_sta->last_tpt = current_tpt; | |
1995 | ||
1996 | /* Select a new "search" modulation mode to try. | |
1997 | * If one is found, set up the new "search" table. */ | |
1998 | if (is_legacy(tbl->lq_type)) | |
1999 | rs_move_legacy_other(priv, lq_sta, conf, sta, index); | |
2000 | else if (is_siso(tbl->lq_type)) | |
2001 | rs_move_siso_to_other(priv, lq_sta, conf, sta, index); | |
2002 | else | |
2003 | rs_move_mimo_to_other(priv, lq_sta, conf, sta, index); | |
2004 | ||
2005 | /* If new "search" mode was selected, set up in uCode table */ | |
2006 | if (lq_sta->search_better_tbl) { | |
2007 | /* Access the "search" table, clear its history. */ | |
2008 | tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); | |
2009 | for (i = 0; i < IWL_RATE_COUNT; i++) | |
2010 | rs_rate_scale_clear_window(&(tbl->win[i])); | |
2011 | ||
2012 | /* Use new "search" start rate */ | |
2013 | index = iwl_hwrate_to_plcp_idx(tbl->current_rate); | |
2014 | ||
2015 | IWL_DEBUG_RATE("Switch current mcs: %X index: %d\n", | |
2016 | tbl->current_rate, index); | |
2017 | rs_fill_link_cmd(priv, lq_sta, tbl->current_rate); | |
2018 | iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC); | |
2019 | } | |
2020 | ||
2021 | /* If the "active" (non-search) mode was legacy, | |
2022 | * and we've tried switching antennas, | |
2023 | * but we haven't been able to try HT modes (not available), | |
2024 | * stay with best antenna legacy modulation for a while | |
2025 | * before next round of mode comparisons. */ | |
2026 | tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]); | |
2027 | if (is_legacy(tbl1->lq_type) && | |
2028 | (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)) && | |
2029 | (lq_sta->action_counter >= 1)) { | |
2030 | lq_sta->action_counter = 0; | |
2031 | IWL_DEBUG_RATE("LQ: STAY in legacy table\n"); | |
2032 | rs_set_stay_in_table(priv, 1, lq_sta); | |
2033 | } | |
2034 | ||
2035 | /* If we're in an HT mode, and all 3 mode switch actions | |
2036 | * have been tried and compared, stay in this best modulation | |
2037 | * mode for a while before next round of mode comparisons. */ | |
2038 | if (lq_sta->enable_counter && | |
2039 | (lq_sta->action_counter >= IWL_ACTION_LIMIT)) { | |
2040 | if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) && | |
2041 | (lq_sta->tx_agg_tid_en & (1 << tid)) && | |
2042 | (tid != MAX_TID_COUNT)) { | |
2043 | IWL_DEBUG_RATE("try to aggregate tid %d\n", tid); | |
2044 | rs_tl_turn_on_agg(priv, tid, lq_sta, sta); | |
2045 | } | |
2046 | lq_sta->action_counter = 0; | |
2047 | rs_set_stay_in_table(priv, 0, lq_sta); | |
2048 | } | |
2049 | ||
2050 | /* | |
2051 | * Else, don't search for a new modulation mode. | |
2052 | * Put new timestamp in stay-in-modulation-mode flush timer if: | |
2053 | * 1) Not changing rates right now | |
2054 | * 2) Not just finishing up a search | |
2055 | * 3) flush timer is empty | |
2056 | */ | |
2057 | } else { | |
2058 | if ((!update_lq) && (!done_search) && (!lq_sta->flush_timer)) | |
2059 | lq_sta->flush_timer = jiffies; | |
2060 | } | |
2061 | ||
2062 | out: | |
2063 | tbl->current_rate = rate_n_flags_from_tbl(tbl, index, is_green); | |
2064 | i = index; | |
2065 | lq_sta->last_txrate_idx = i; | |
2066 | ||
2067 | return; | |
2068 | } | |
2069 | ||
2070 | ||
2071 | static void rs_initialize_lq(struct iwl_priv *priv, | |
2072 | struct ieee80211_conf *conf, | |
2073 | struct sta_info *sta) | |
2074 | { | |
2075 | struct iwl_lq_sta *lq_sta; | |
2076 | struct iwl_scale_tbl_info *tbl; | |
2077 | int rate_idx; | |
2078 | int i; | |
2079 | u32 rate; | |
2080 | u8 use_green = rs_use_green(priv, conf); | |
2081 | u8 active_tbl = 0; | |
2082 | u8 valid_tx_ant; | |
2083 | ||
2084 | if (!sta || !sta->rate_ctrl_priv) | |
2085 | goto out; | |
2086 | ||
2087 | lq_sta = (struct iwl_lq_sta *)sta->rate_ctrl_priv; | |
2088 | i = lq_sta->last_txrate_idx; | |
2089 | ||
2090 | if ((lq_sta->lq.sta_id == 0xff) && | |
2091 | (priv->iw_mode == NL80211_IFTYPE_ADHOC)) | |
2092 | goto out; | |
2093 | ||
2094 | valid_tx_ant = priv->hw_params.valid_tx_ant; | |
2095 | ||
2096 | if (!lq_sta->search_better_tbl) | |
2097 | active_tbl = lq_sta->active_tbl; | |
2098 | else | |
2099 | active_tbl = 1 - lq_sta->active_tbl; | |
2100 | ||
2101 | tbl = &(lq_sta->lq_info[active_tbl]); | |
2102 | ||
2103 | if ((i < 0) || (i >= IWL_RATE_COUNT)) | |
2104 | i = 0; | |
2105 | ||
2106 | /* FIXME:RS: This is also wrong in 4965 */ | |
2107 | rate = iwl_rates[i].plcp; | |
2108 | rate |= RATE_MCS_ANT_B_MSK; | |
2109 | rate &= ~RATE_MCS_ANT_A_MSK; | |
2110 | ||
2111 | if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE) | |
2112 | rate |= RATE_MCS_CCK_MSK; | |
2113 | ||
2114 | tbl->ant_type = ANT_B; | |
2115 | rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx); | |
2116 | if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type)) | |
2117 | rs_toggle_antenna(valid_tx_ant, &rate, tbl); | |
2118 | ||
2119 | rate = rate_n_flags_from_tbl(tbl, rate_idx, use_green); | |
2120 | tbl->current_rate = rate; | |
2121 | rs_set_expected_tpt_table(lq_sta, tbl); | |
2122 | rs_fill_link_cmd(NULL, lq_sta, rate); | |
2123 | iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC); | |
2124 | out: | |
2125 | return; | |
2126 | } | |
2127 | ||
2128 | static void rs_get_rate(void *priv_rate, struct net_device *dev, | |
2129 | struct ieee80211_supported_band *sband, | |
2130 | struct sk_buff *skb, | |
2131 | struct rate_selection *sel) | |
2132 | { | |
2133 | ||
2134 | int i; | |
2135 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
2136 | struct ieee80211_conf *conf = &local->hw.conf; | |
2137 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
2138 | struct sta_info *sta; | |
2139 | __le16 fc; | |
2140 | struct iwl_priv *priv = (struct iwl_priv *)priv_rate; | |
2141 | struct iwl_lq_sta *lq_sta; | |
2142 | ||
2143 | IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n"); | |
2144 | ||
2145 | rcu_read_lock(); | |
2146 | ||
2147 | sta = sta_info_get(local, hdr->addr1); | |
2148 | ||
2149 | /* Send management frames and broadcast/multicast data using lowest | |
2150 | * rate. */ | |
2151 | fc = hdr->frame_control; | |
2152 | if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1) || | |
2153 | !sta || !sta->rate_ctrl_priv) { | |
2154 | sel->rate_idx = rate_lowest_index(local, sband, sta); | |
2155 | goto out; | |
2156 | } | |
2157 | ||
2158 | lq_sta = (struct iwl_lq_sta *)sta->rate_ctrl_priv; | |
2159 | i = lq_sta->last_txrate_idx; | |
2160 | ||
2161 | if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) && | |
2162 | !lq_sta->ibss_sta_added) { | |
2163 | u8 sta_id = iwl_find_station(priv, hdr->addr1); | |
2164 | DECLARE_MAC_BUF(mac); | |
2165 | ||
2166 | if (sta_id == IWL_INVALID_STATION) { | |
2167 | IWL_DEBUG_RATE("LQ: ADD station %s\n", | |
2168 | print_mac(mac, hdr->addr1)); | |
2169 | sta_id = iwl_add_station_flags(priv, hdr->addr1, | |
2170 | 0, CMD_ASYNC, NULL); | |
2171 | } | |
2172 | if ((sta_id != IWL_INVALID_STATION)) { | |
2173 | lq_sta->lq.sta_id = sta_id; | |
2174 | lq_sta->lq.rs_table[0].rate_n_flags = 0; | |
2175 | lq_sta->ibss_sta_added = 1; | |
2176 | rs_initialize_lq(priv, conf, sta); | |
2177 | } | |
2178 | } | |
2179 | ||
2180 | if ((i < 0) || (i > IWL_RATE_COUNT)) { | |
2181 | sel->rate_idx = rate_lowest_index(local, sband, sta); | |
2182 | goto out; | |
2183 | } | |
2184 | ||
2185 | if (sband->band == IEEE80211_BAND_5GHZ) | |
2186 | i -= IWL_FIRST_OFDM_RATE; | |
2187 | sel->rate_idx = i; | |
2188 | out: | |
2189 | rcu_read_unlock(); | |
2190 | } | |
2191 | ||
2192 | static void *rs_alloc_sta(void *priv_rate, gfp_t gfp) | |
2193 | { | |
2194 | struct iwl_lq_sta *lq_sta; | |
2195 | struct iwl_priv *priv; | |
2196 | int i, j; | |
2197 | ||
2198 | priv = (struct iwl_priv *)priv_rate; | |
2199 | IWL_DEBUG_RATE("create station rate scale window\n"); | |
2200 | ||
2201 | lq_sta = kzalloc(sizeof(struct iwl_lq_sta), gfp); | |
2202 | ||
2203 | if (lq_sta == NULL) | |
2204 | return NULL; | |
2205 | lq_sta->lq.sta_id = 0xff; | |
2206 | ||
2207 | ||
2208 | for (j = 0; j < LQ_SIZE; j++) | |
2209 | for (i = 0; i < IWL_RATE_COUNT; i++) | |
2210 | rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]); | |
2211 | ||
2212 | return lq_sta; | |
2213 | } | |
2214 | ||
2215 | static void rs_rate_init(void *priv_rate, void *priv_sta, | |
2216 | struct ieee80211_local *local, | |
2217 | struct sta_info *sta) | |
2218 | { | |
2219 | int i, j; | |
2220 | struct ieee80211_conf *conf = &local->hw.conf; | |
2221 | struct ieee80211_supported_band *sband; | |
2222 | struct iwl_priv *priv = (struct iwl_priv *)priv_rate; | |
2223 | struct iwl_lq_sta *lq_sta = priv_sta; | |
2224 | ||
2225 | sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; | |
2226 | ||
2227 | lq_sta->flush_timer = 0; | |
2228 | lq_sta->supp_rates = sta->sta.supp_rates[sband->band]; | |
2229 | for (j = 0; j < LQ_SIZE; j++) | |
2230 | for (i = 0; i < IWL_RATE_COUNT; i++) | |
2231 | rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]); | |
2232 | ||
2233 | IWL_DEBUG_RATE("LQ: *** rate scale station global init ***\n"); | |
2234 | /* TODO: what is a good starting rate for STA? About middle? Maybe not | |
2235 | * the lowest or the highest rate.. Could consider using RSSI from | |
2236 | * previous packets? Need to have IEEE 802.1X auth succeed immediately | |
2237 | * after assoc.. */ | |
2238 | ||
2239 | lq_sta->ibss_sta_added = 0; | |
2240 | if (priv->iw_mode == NL80211_IFTYPE_AP) { | |
2241 | u8 sta_id = iwl_find_station(priv, sta->sta.addr); | |
2242 | DECLARE_MAC_BUF(mac); | |
2243 | ||
2244 | /* for IBSS the call are from tasklet */ | |
2245 | IWL_DEBUG_RATE("LQ: ADD station %s\n", | |
2246 | print_mac(mac, sta->sta.addr)); | |
2247 | ||
2248 | if (sta_id == IWL_INVALID_STATION) { | |
2249 | IWL_DEBUG_RATE("LQ: ADD station %s\n", | |
2250 | print_mac(mac, sta->sta.addr)); | |
2251 | sta_id = iwl_add_station_flags(priv, sta->sta.addr, | |
2252 | 0, CMD_ASYNC, NULL); | |
2253 | } | |
2254 | if ((sta_id != IWL_INVALID_STATION)) { | |
2255 | lq_sta->lq.sta_id = sta_id; | |
2256 | lq_sta->lq.rs_table[0].rate_n_flags = 0; | |
2257 | } | |
2258 | /* FIXME: this is w/a remove it later */ | |
2259 | priv->assoc_station_added = 1; | |
2260 | } | |
2261 | ||
2262 | /* Find highest tx rate supported by hardware and destination station */ | |
2263 | lq_sta->last_txrate_idx = 3; | |
2264 | for (i = 0; i < sband->n_bitrates; i++) | |
2265 | if (sta->sta.supp_rates[sband->band] & BIT(i)) | |
2266 | lq_sta->last_txrate_idx = i; | |
2267 | ||
2268 | /* For MODE_IEEE80211A, skip over cck rates in global rate table */ | |
2269 | if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ) | |
2270 | lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE; | |
2271 | ||
2272 | lq_sta->is_dup = 0; | |
2273 | lq_sta->is_green = rs_use_green(priv, conf); | |
2274 | lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000); | |
2275 | lq_sta->active_rate_basic = priv->active_rate_basic; | |
2276 | lq_sta->band = priv->band; | |
2277 | /* | |
2278 | * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3), | |
2279 | * supp_rates[] does not; shift to convert format, force 9 MBits off. | |
2280 | */ | |
2281 | lq_sta->active_siso_rate = conf->ht_conf.supp_mcs_set[0] << 1; | |
2282 | lq_sta->active_siso_rate |= conf->ht_conf.supp_mcs_set[0] & 0x1; | |
2283 | lq_sta->active_siso_rate &= ~((u16)0x2); | |
2284 | lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE; | |
2285 | ||
2286 | /* Same here */ | |
2287 | lq_sta->active_mimo2_rate = conf->ht_conf.supp_mcs_set[1] << 1; | |
2288 | lq_sta->active_mimo2_rate |= conf->ht_conf.supp_mcs_set[1] & 0x1; | |
2289 | lq_sta->active_mimo2_rate &= ~((u16)0x2); | |
2290 | lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE; | |
2291 | ||
2292 | lq_sta->active_mimo3_rate = conf->ht_conf.supp_mcs_set[2] << 1; | |
2293 | lq_sta->active_mimo3_rate |= conf->ht_conf.supp_mcs_set[2] & 0x1; | |
2294 | lq_sta->active_mimo3_rate &= ~((u16)0x2); | |
2295 | lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE; | |
2296 | ||
2297 | IWL_DEBUG_RATE("SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n", | |
2298 | lq_sta->active_siso_rate, | |
2299 | lq_sta->active_mimo2_rate, | |
2300 | lq_sta->active_mimo3_rate); | |
2301 | ||
2302 | /* These values will be overriden later */ | |
2303 | lq_sta->lq.general_params.single_stream_ant_msk = ANT_A; | |
2304 | lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB; | |
2305 | ||
2306 | /* as default allow aggregation for all tids */ | |
2307 | lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID; | |
2308 | lq_sta->drv = priv; | |
2309 | ||
2310 | rs_initialize_lq(priv, conf, sta); | |
2311 | } | |
2312 | ||
2313 | static void rs_fill_link_cmd(const struct iwl_priv *priv, | |
2314 | struct iwl_lq_sta *lq_sta, u32 new_rate) | |
2315 | { | |
2316 | struct iwl_scale_tbl_info tbl_type; | |
2317 | int index = 0; | |
2318 | int rate_idx; | |
2319 | int repeat_rate = 0; | |
2320 | u8 ant_toggle_cnt = 0; | |
2321 | u8 use_ht_possible = 1; | |
2322 | u8 valid_tx_ant = 0; | |
2323 | struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq; | |
2324 | ||
2325 | /* Override starting rate (index 0) if needed for debug purposes */ | |
2326 | rs_dbgfs_set_mcs(lq_sta, &new_rate, index); | |
2327 | ||
2328 | /* Interpret new_rate (rate_n_flags) */ | |
2329 | memset(&tbl_type, 0, sizeof(tbl_type)); | |
2330 | rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, | |
2331 | &tbl_type, &rate_idx); | |
2332 | ||
2333 | /* How many times should we repeat the initial rate? */ | |
2334 | if (is_legacy(tbl_type.lq_type)) { | |
2335 | ant_toggle_cnt = 1; | |
2336 | repeat_rate = IWL_NUMBER_TRY; | |
2337 | } else { | |
2338 | repeat_rate = IWL_HT_NUMBER_TRY; | |
2339 | } | |
2340 | ||
2341 | lq_cmd->general_params.mimo_delimiter = | |
2342 | is_mimo(tbl_type.lq_type) ? 1 : 0; | |
2343 | ||
2344 | /* Fill 1st table entry (index 0) */ | |
2345 | lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate); | |
2346 | ||
2347 | if (num_of_ant(tbl_type.ant_type) == 1) { | |
2348 | lq_cmd->general_params.single_stream_ant_msk = | |
2349 | tbl_type.ant_type; | |
2350 | } else if (num_of_ant(tbl_type.ant_type) == 2) { | |
2351 | lq_cmd->general_params.dual_stream_ant_msk = | |
2352 | tbl_type.ant_type; | |
2353 | } /* otherwise we don't modify the existing value */ | |
2354 | ||
2355 | index++; | |
2356 | repeat_rate--; | |
2357 | ||
2358 | if (priv) | |
2359 | valid_tx_ant = priv->hw_params.valid_tx_ant; | |
2360 | ||
2361 | /* Fill rest of rate table */ | |
2362 | while (index < LINK_QUAL_MAX_RETRY_NUM) { | |
2363 | /* Repeat initial/next rate. | |
2364 | * For legacy IWL_NUMBER_TRY == 1, this loop will not execute. | |
2365 | * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */ | |
2366 | while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) { | |
2367 | if (is_legacy(tbl_type.lq_type)) { | |
2368 | if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE) | |
2369 | ant_toggle_cnt++; | |
2370 | else if (priv && | |
2371 | rs_toggle_antenna(valid_tx_ant, | |
2372 | &new_rate, &tbl_type)) | |
2373 | ant_toggle_cnt = 1; | |
2374 | } | |
2375 | ||
2376 | /* Override next rate if needed for debug purposes */ | |
2377 | rs_dbgfs_set_mcs(lq_sta, &new_rate, index); | |
2378 | ||
2379 | /* Fill next table entry */ | |
2380 | lq_cmd->rs_table[index].rate_n_flags = | |
2381 | cpu_to_le32(new_rate); | |
2382 | repeat_rate--; | |
2383 | index++; | |
2384 | } | |
2385 | ||
2386 | rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type, | |
2387 | &rate_idx); | |
2388 | ||
2389 | /* Indicate to uCode which entries might be MIMO. | |
2390 | * If initial rate was MIMO, this will finally end up | |
2391 | * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */ | |
2392 | if (is_mimo(tbl_type.lq_type)) | |
2393 | lq_cmd->general_params.mimo_delimiter = index; | |
2394 | ||
2395 | /* Get next rate */ | |
2396 | new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx, | |
2397 | use_ht_possible); | |
2398 | ||
2399 | /* How many times should we repeat the next rate? */ | |
2400 | if (is_legacy(tbl_type.lq_type)) { | |
2401 | if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE) | |
2402 | ant_toggle_cnt++; | |
2403 | else if (priv && | |
2404 | rs_toggle_antenna(valid_tx_ant, | |
2405 | &new_rate, &tbl_type)) | |
2406 | ant_toggle_cnt = 1; | |
2407 | ||
2408 | repeat_rate = IWL_NUMBER_TRY; | |
2409 | } else { | |
2410 | repeat_rate = IWL_HT_NUMBER_TRY; | |
2411 | } | |
2412 | ||
2413 | /* Don't allow HT rates after next pass. | |
2414 | * rs_get_lower_rate() will change type to LQ_A or LQ_G. */ | |
2415 | use_ht_possible = 0; | |
2416 | ||
2417 | /* Override next rate if needed for debug purposes */ | |
2418 | rs_dbgfs_set_mcs(lq_sta, &new_rate, index); | |
2419 | ||
2420 | /* Fill next table entry */ | |
2421 | lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate); | |
2422 | ||
2423 | index++; | |
2424 | repeat_rate--; | |
2425 | } | |
2426 | ||
2427 | lq_cmd->agg_params.agg_frame_cnt_limit = 64; | |
2428 | lq_cmd->agg_params.agg_dis_start_th = 3; | |
2429 | lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000); | |
2430 | } | |
2431 | ||
2432 | static void *rs_alloc(struct ieee80211_local *local) | |
2433 | { | |
2434 | return local->hw.priv; | |
2435 | } | |
2436 | /* rate scale requires free function to be implemented */ | |
2437 | static void rs_free(void *priv_rate) | |
2438 | { | |
2439 | return; | |
2440 | } | |
2441 | ||
2442 | static void rs_clear(void *priv_rate) | |
2443 | { | |
2444 | #ifdef CONFIG_IWLWIFI_DEBUG | |
2445 | struct iwl_priv *priv = (struct iwl_priv *) priv_rate; | |
2446 | ||
2447 | IWL_DEBUG_RATE("enter\n"); | |
2448 | ||
2449 | /* TODO - add rate scale state reset */ | |
2450 | ||
2451 | IWL_DEBUG_RATE("leave\n"); | |
2452 | #endif /* CONFIG_IWLWIFI_DEBUG */ | |
2453 | } | |
2454 | ||
2455 | static void rs_free_sta(void *priv_rate, void *priv_sta) | |
2456 | { | |
2457 | struct iwl_lq_sta *lq_sta = priv_sta; | |
2458 | struct iwl_priv *priv; | |
2459 | ||
2460 | priv = (struct iwl_priv *)priv_rate; | |
2461 | IWL_DEBUG_RATE("enter\n"); | |
2462 | kfree(lq_sta); | |
2463 | IWL_DEBUG_RATE("leave\n"); | |
2464 | } | |
2465 | ||
2466 | ||
2467 | #ifdef CONFIG_MAC80211_DEBUGFS | |
2468 | static int open_file_generic(struct inode *inode, struct file *file) | |
2469 | { | |
2470 | file->private_data = inode->i_private; | |
2471 | return 0; | |
2472 | } | |
2473 | static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta, | |
2474 | u32 *rate_n_flags, int index) | |
2475 | { | |
2476 | struct iwl_priv *priv; | |
2477 | ||
2478 | priv = lq_sta->drv; | |
2479 | if (lq_sta->dbg_fixed_rate) { | |
2480 | if (index < 12) { | |
2481 | *rate_n_flags = lq_sta->dbg_fixed_rate; | |
2482 | } else { | |
2483 | if (lq_sta->band == IEEE80211_BAND_5GHZ) | |
2484 | *rate_n_flags = 0x800D; | |
2485 | else | |
2486 | *rate_n_flags = 0x820A; | |
2487 | } | |
2488 | IWL_DEBUG_RATE("Fixed rate ON\n"); | |
2489 | } else { | |
2490 | IWL_DEBUG_RATE("Fixed rate OFF\n"); | |
2491 | } | |
2492 | } | |
2493 | ||
2494 | static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file, | |
2495 | const char __user *user_buf, size_t count, loff_t *ppos) | |
2496 | { | |
2497 | struct iwl_lq_sta *lq_sta = file->private_data; | |
2498 | struct iwl_priv *priv; | |
2499 | char buf[64]; | |
2500 | int buf_size; | |
2501 | u32 parsed_rate; | |
2502 | ||
2503 | priv = lq_sta->drv; | |
2504 | memset(buf, 0, sizeof(buf)); | |
2505 | buf_size = min(count, sizeof(buf) - 1); | |
2506 | if (copy_from_user(buf, user_buf, buf_size)) | |
2507 | return -EFAULT; | |
2508 | ||
2509 | if (sscanf(buf, "%x", &parsed_rate) == 1) | |
2510 | lq_sta->dbg_fixed_rate = parsed_rate; | |
2511 | else | |
2512 | lq_sta->dbg_fixed_rate = 0; | |
2513 | ||
2514 | lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */ | |
2515 | lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ | |
2516 | lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ | |
2517 | lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ | |
2518 | ||
2519 | IWL_DEBUG_RATE("sta_id %d rate 0x%X\n", | |
2520 | lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate); | |
2521 | ||
2522 | if (lq_sta->dbg_fixed_rate) { | |
2523 | rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate); | |
2524 | iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC); | |
2525 | } | |
2526 | ||
2527 | return count; | |
2528 | } | |
2529 | ||
2530 | static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file, | |
2531 | char __user *user_buf, size_t count, loff_t *ppos) | |
2532 | { | |
2533 | char buff[1024]; | |
2534 | int desc = 0; | |
2535 | int i = 0; | |
2536 | ||
2537 | struct iwl_lq_sta *lq_sta = file->private_data; | |
2538 | ||
2539 | desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id); | |
2540 | desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n", | |
2541 | lq_sta->total_failed, lq_sta->total_success, | |
2542 | lq_sta->active_legacy_rate); | |
2543 | desc += sprintf(buff+desc, "fixed rate 0x%X\n", | |
2544 | lq_sta->dbg_fixed_rate); | |
2545 | desc += sprintf(buff+desc, "general:" | |
2546 | "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n", | |
2547 | lq_sta->lq.general_params.flags, | |
2548 | lq_sta->lq.general_params.mimo_delimiter, | |
2549 | lq_sta->lq.general_params.single_stream_ant_msk, | |
2550 | lq_sta->lq.general_params.dual_stream_ant_msk); | |
2551 | ||
2552 | desc += sprintf(buff+desc, "agg:" | |
2553 | "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n", | |
2554 | le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit), | |
2555 | lq_sta->lq.agg_params.agg_dis_start_th, | |
2556 | lq_sta->lq.agg_params.agg_frame_cnt_limit); | |
2557 | ||
2558 | desc += sprintf(buff+desc, | |
2559 | "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n", | |
2560 | lq_sta->lq.general_params.start_rate_index[0], | |
2561 | lq_sta->lq.general_params.start_rate_index[1], | |
2562 | lq_sta->lq.general_params.start_rate_index[2], | |
2563 | lq_sta->lq.general_params.start_rate_index[3]); | |
2564 | ||
2565 | ||
2566 | for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) | |
2567 | desc += sprintf(buff+desc, " rate[%d] 0x%X\n", | |
2568 | i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags)); | |
2569 | ||
2570 | return simple_read_from_buffer(user_buf, count, ppos, buff, desc); | |
2571 | } | |
2572 | ||
2573 | static const struct file_operations rs_sta_dbgfs_scale_table_ops = { | |
2574 | .write = rs_sta_dbgfs_scale_table_write, | |
2575 | .read = rs_sta_dbgfs_scale_table_read, | |
2576 | .open = open_file_generic, | |
2577 | }; | |
2578 | static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file, | |
2579 | char __user *user_buf, size_t count, loff_t *ppos) | |
2580 | { | |
2581 | char buff[1024]; | |
2582 | int desc = 0; | |
2583 | int i, j; | |
2584 | ||
2585 | struct iwl_lq_sta *lq_sta = file->private_data; | |
2586 | for (i = 0; i < LQ_SIZE; i++) { | |
2587 | desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n" | |
2588 | "rate=0x%X\n", | |
2589 | lq_sta->active_tbl == i?"*":"x", | |
2590 | lq_sta->lq_info[i].lq_type, | |
2591 | lq_sta->lq_info[i].is_SGI, | |
2592 | lq_sta->lq_info[i].is_fat, | |
2593 | lq_sta->lq_info[i].is_dup, | |
2594 | lq_sta->lq_info[i].current_rate); | |
2595 | for (j = 0; j < IWL_RATE_COUNT; j++) { | |
2596 | desc += sprintf(buff+desc, | |
2597 | "counter=%d success=%d %%=%d\n", | |
2598 | lq_sta->lq_info[i].win[j].counter, | |
2599 | lq_sta->lq_info[i].win[j].success_counter, | |
2600 | lq_sta->lq_info[i].win[j].success_ratio); | |
2601 | } | |
2602 | } | |
2603 | return simple_read_from_buffer(user_buf, count, ppos, buff, desc); | |
2604 | } | |
2605 | ||
2606 | static const struct file_operations rs_sta_dbgfs_stats_table_ops = { | |
2607 | .read = rs_sta_dbgfs_stats_table_read, | |
2608 | .open = open_file_generic, | |
2609 | }; | |
2610 | ||
2611 | static void rs_add_debugfs(void *priv, void *priv_sta, | |
2612 | struct dentry *dir) | |
2613 | { | |
2614 | struct iwl_lq_sta *lq_sta = priv_sta; | |
2615 | lq_sta->rs_sta_dbgfs_scale_table_file = | |
2616 | debugfs_create_file("rate_scale_table", 0600, dir, | |
2617 | lq_sta, &rs_sta_dbgfs_scale_table_ops); | |
2618 | lq_sta->rs_sta_dbgfs_stats_table_file = | |
2619 | debugfs_create_file("rate_stats_table", 0600, dir, | |
2620 | lq_sta, &rs_sta_dbgfs_stats_table_ops); | |
2621 | lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file = | |
2622 | debugfs_create_u8("tx_agg_tid_enable", 0600, dir, | |
2623 | &lq_sta->tx_agg_tid_en); | |
2624 | ||
2625 | } | |
2626 | ||
2627 | static void rs_remove_debugfs(void *priv, void *priv_sta) | |
2628 | { | |
2629 | struct iwl_lq_sta *lq_sta = priv_sta; | |
2630 | debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file); | |
2631 | debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file); | |
2632 | debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file); | |
2633 | } | |
2634 | #endif | |
2635 | ||
2636 | static struct rate_control_ops rs_ops = { | |
2637 | .module = NULL, | |
2638 | .name = RS_NAME, | |
2639 | .tx_status = rs_tx_status, | |
2640 | .get_rate = rs_get_rate, | |
2641 | .rate_init = rs_rate_init, | |
2642 | .clear = rs_clear, | |
2643 | .alloc = rs_alloc, | |
2644 | .free = rs_free, | |
2645 | .alloc_sta = rs_alloc_sta, | |
2646 | .free_sta = rs_free_sta, | |
2647 | #ifdef CONFIG_MAC80211_DEBUGFS | |
2648 | .add_sta_debugfs = rs_add_debugfs, | |
2649 | .remove_sta_debugfs = rs_remove_debugfs, | |
2650 | #endif | |
2651 | }; | |
2652 | ||
2653 | int iwlagn_rate_control_register(void) | |
2654 | { | |
2655 | return ieee80211_rate_control_register(&rs_ops); | |
2656 | } | |
2657 | ||
2658 | void iwlagn_rate_control_unregister(void) | |
2659 | { | |
2660 | ieee80211_rate_control_unregister(&rs_ops); | |
2661 | } | |
2662 |