projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
iwlwifi: Change define and struct names in iwl-eeprom-parse.h
[deliverable/linux.git] / drivers / net / wireless / iwlwifi / dvm / rs.c
1 /******************************************************************************
2 *
3 * Copyright(c) 2005 - 2012 Intel Corporation. All rights reserved.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2 of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
17 *
18 * The full GNU General Public License is included in this distribution in the
19 * file called LICENSE.
20 *
21 * Contact Information:
22 * Intel Linux Wireless <ilw@linux.intel.com>
23 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
24 *
25 *****************************************************************************/
26 #include <linux/kernel.h>
27 #include <linux/init.h>
28 #include <linux/skbuff.h>
29 #include <linux/slab.h>
30 #include <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 "dev.h"
39 #include "agn.h"
40
41 #define RS_NAME "iwl-agn-rs"
42
43 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
44 #define IWL_NUMBER_TRY 1
45 #define IWL_HT_NUMBER_TRY 3
46
47 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
48 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
49 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
50
51 /* max allowed rate miss before sync LQ cmd */
52 #define IWL_MISSED_RATE_MAX 15
53 /* max time to accum history 2 seconds */
54 #define IWL_RATE_SCALE_FLUSH_INTVL (3*HZ)
55
56 static u8 rs_ht_to_legacy[] = {
57 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
58 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
59 IWL_RATE_6M_INDEX,
60 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
61 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
62 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
63 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
64 };
65
66 static const u8 ant_toggle_lookup[] = {
67 /*ANT_NONE -> */ ANT_NONE,
68 /*ANT_A -> */ ANT_B,
69 /*ANT_B -> */ ANT_C,
70 /*ANT_AB -> */ ANT_BC,
71 /*ANT_C -> */ ANT_A,
72 /*ANT_AC -> */ ANT_AB,
73 /*ANT_BC -> */ ANT_AC,
74 /*ANT_ABC -> */ ANT_ABC,
75 };
76
77 #define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np) \
78 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
79 IWL_RATE_SISO_##s##M_PLCP, \
80 IWL_RATE_MIMO2_##s##M_PLCP,\
81 IWL_RATE_MIMO3_##s##M_PLCP,\
82 IWL_RATE_##r##M_IEEE, \
83 IWL_RATE_##ip##M_INDEX, \
84 IWL_RATE_##in##M_INDEX, \
85 IWL_RATE_##rp##M_INDEX, \
86 IWL_RATE_##rn##M_INDEX, \
87 IWL_RATE_##pp##M_INDEX, \
88 IWL_RATE_##np##M_INDEX }
89
90 /*
91 * Parameter order:
92 * rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
93 *
94 * If there isn't a valid next or previous rate then INV is used which
95 * maps to IWL_RATE_INVALID
96 *
97 */
98 const struct iwl_rate_info iwl_rates[IWL_RATE_COUNT] = {
99 IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2), /* 1mbps */
100 IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5), /* 2mbps */
101 IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11), /*5.5mbps */
102 IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18), /* 11mbps */
103 IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11), /* 6mbps */
104 IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11), /* 9mbps */
105 IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18), /* 12mbps */
106 IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24), /* 18mbps */
107 IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36), /* 24mbps */
108 IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48), /* 36mbps */
109 IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54), /* 48mbps */
110 IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
111 IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
112 /* FIXME:RS: ^^ should be INV (legacy) */
113 };
114
115 static inline u8 rs_extract_rate(u32 rate_n_flags)
116 {
117 return (u8)(rate_n_flags & RATE_MCS_RATE_MSK);
118 }
119
120 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
121 {
122 int idx = 0;
123
124 /* HT rate format */
125 if (rate_n_flags & RATE_MCS_HT_MSK) {
126 idx = rs_extract_rate(rate_n_flags);
127
128 if (idx >= IWL_RATE_MIMO3_6M_PLCP)
129 idx = idx - IWL_RATE_MIMO3_6M_PLCP;
130 else if (idx >= IWL_RATE_MIMO2_6M_PLCP)
131 idx = idx - IWL_RATE_MIMO2_6M_PLCP;
132
133 idx += IWL_FIRST_OFDM_RATE;
134 /* skip 9M not supported in ht*/
135 if (idx >= IWL_RATE_9M_INDEX)
136 idx += 1;
137 if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE))
138 return idx;
139
140 /* legacy rate format, search for match in table */
141 } else {
142 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
143 if (iwl_rates[idx].plcp ==
144 rs_extract_rate(rate_n_flags))
145 return idx;
146 }
147
148 return -1;
149 }
150
151 static void rs_rate_scale_perform(struct iwl_priv *priv,
152 struct sk_buff *skb,
153 struct ieee80211_sta *sta,
154 struct iwl_lq_sta *lq_sta);
155 static void rs_fill_link_cmd(struct iwl_priv *priv,
156 struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
157 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
158
159
160 #ifdef CONFIG_MAC80211_DEBUGFS
161 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
162 u32 *rate_n_flags, int index);
163 #else
164 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
165 u32 *rate_n_flags, int index)
166 {}
167 #endif
168
169 /**
170 * The following tables contain the expected throughput metrics for all rates
171 *
172 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
173 *
174 * where invalid entries are zeros.
175 *
176 * CCK rates are only valid in legacy table and will only be used in G
177 * (2.4 GHz) band.
178 */
179
180 static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
181 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
182 };
183
184 static s32 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
185 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202}, /* Norm */
186 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210}, /* SGI */
187 {0, 0, 0, 0, 47, 0, 91, 133, 171, 242, 305, 334, 362}, /* AGG */
188 {0, 0, 0, 0, 52, 0, 101, 145, 187, 264, 330, 361, 390}, /* AGG+SGI */
189 };
190
191 static s32 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
192 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
193 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
194 {0, 0, 0, 0, 94, 0, 177, 249, 313, 423, 512, 550, 586}, /* AGG */
195 {0, 0, 0, 0, 104, 0, 193, 270, 338, 454, 545, 584, 620}, /* AGG+SGI */
196 };
197
198 static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
199 {0, 0, 0, 0, 74, 0, 123, 155, 179, 214, 236, 244, 251}, /* Norm */
200 {0, 0, 0, 0, 81, 0, 131, 164, 188, 223, 243, 251, 257}, /* SGI */
201 {0, 0, 0, 0, 89, 0, 167, 235, 296, 402, 488, 526, 560}, /* AGG */
202 {0, 0, 0, 0, 97, 0, 182, 255, 320, 431, 520, 558, 593}, /* AGG+SGI*/
203 };
204
205 static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
206 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
207 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
208 {0, 0, 0, 0, 171, 0, 305, 410, 496, 634, 731, 771, 805}, /* AGG */
209 {0, 0, 0, 0, 186, 0, 329, 439, 527, 667, 764, 803, 838}, /* AGG+SGI */
210 };
211
212 static s32 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = {
213 {0, 0, 0, 0, 99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */
214 {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */
215 {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */
216 {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */
217 };
218
219 static s32 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = {
220 {0, 0, 0, 0, 152, 0, 211, 239, 255, 279, 290, 294, 297}, /* Norm */
221 {0, 0, 0, 0, 160, 0, 219, 245, 261, 284, 294, 297, 300}, /* SGI */
222 {0, 0, 0, 0, 254, 0, 443, 584, 695, 868, 984, 1030, 1070}, /* AGG */
223 {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */
224 };
225
226 /* mbps, mcs */
227 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
228 { "1", "BPSK DSSS"},
229 { "2", "QPSK DSSS"},
230 {"5.5", "BPSK CCK"},
231 { "11", "QPSK CCK"},
232 { "6", "BPSK 1/2"},
233 { "9", "BPSK 1/2"},
234 { "12", "QPSK 1/2"},
235 { "18", "QPSK 3/4"},
236 { "24", "16QAM 1/2"},
237 { "36", "16QAM 3/4"},
238 { "48", "64QAM 2/3"},
239 { "54", "64QAM 3/4"},
240 { "60", "64QAM 5/6"},
241 };
242
243 #define MCS_INDEX_PER_STREAM (8)
244
245 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
246 {
247 window->data = 0;
248 window->success_counter = 0;
249 window->success_ratio = IWL_INVALID_VALUE;
250 window->counter = 0;
251 window->average_tpt = IWL_INVALID_VALUE;
252 window->stamp = 0;
253 }
254
255 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
256 {
257 return (ant_type & valid_antenna) == ant_type;
258 }
259
260 /*
261 * removes the old data from the statistics. All data that is older than
262 * TID_MAX_TIME_DIFF, will be deleted.
263 */
264 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
265 {
266 /* The oldest age we want to keep */
267 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
268
269 while (tl->queue_count &&
270 (tl->time_stamp < oldest_time)) {
271 tl->total -= tl->packet_count[tl->head];
272 tl->packet_count[tl->head] = 0;
273 tl->time_stamp += TID_QUEUE_CELL_SPACING;
274 tl->queue_count--;
275 tl->head++;
276 if (tl->head >= TID_QUEUE_MAX_SIZE)
277 tl->head = 0;
278 }
279 }
280
281 /*
282 * increment traffic load value for tid and also remove
283 * any old values if passed the certain time period
284 */
285 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
286 struct ieee80211_hdr *hdr)
287 {
288 u32 curr_time = jiffies_to_msecs(jiffies);
289 u32 time_diff;
290 s32 index;
291 struct iwl_traffic_load *tl = NULL;
292 u8 tid;
293
294 if (ieee80211_is_data_qos(hdr->frame_control)) {
295 u8 *qc = ieee80211_get_qos_ctl(hdr);
296 tid = qc[0] & 0xf;
297 } else
298 return IWL_MAX_TID_COUNT;
299
300 if (unlikely(tid >= IWL_MAX_TID_COUNT))
301 return IWL_MAX_TID_COUNT;
302
303 tl = &lq_data->load[tid];
304
305 curr_time -= curr_time % TID_ROUND_VALUE;
306
307 /* Happens only for the first packet. Initialize the data */
308 if (!(tl->queue_count)) {
309 tl->total = 1;
310 tl->time_stamp = curr_time;
311 tl->queue_count = 1;
312 tl->head = 0;
313 tl->packet_count[0] = 1;
314 return IWL_MAX_TID_COUNT;
315 }
316
317 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
318 index = time_diff / TID_QUEUE_CELL_SPACING;
319
320 /* The history is too long: remove data that is older than */
321 /* TID_MAX_TIME_DIFF */
322 if (index >= TID_QUEUE_MAX_SIZE)
323 rs_tl_rm_old_stats(tl, curr_time);
324
325 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
326 tl->packet_count[index] = tl->packet_count[index] + 1;
327 tl->total = tl->total + 1;
328
329 if ((index + 1) > tl->queue_count)
330 tl->queue_count = index + 1;
331
332 return tid;
333 }
334
335 #ifdef CONFIG_MAC80211_DEBUGFS
336 /**
337 * Program the device to use fixed rate for frame transmit
338 * This is for debugging/testing only
339 * once the device start use fixed rate, we need to reload the module
340 * to being back the normal operation.
341 */
342 static void rs_program_fix_rate(struct iwl_priv *priv,
343 struct iwl_lq_sta *lq_sta)
344 {
345 struct iwl_station_priv *sta_priv =
346 container_of(lq_sta, struct iwl_station_priv, lq_sta);
347 struct iwl_rxon_context *ctx = sta_priv->ctx;
348
349 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
350 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
351 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
352 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
353
354 #ifdef CONFIG_IWLWIFI_DEVICE_TESTMODE
355 /* testmode has higher priority to overwirte the fixed rate */
356 if (priv->tm_fixed_rate)
357 lq_sta->dbg_fixed_rate = priv->tm_fixed_rate;
358 #endif
359
360 IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
361 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
362
363 if (lq_sta->dbg_fixed_rate) {
364 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
365 iwl_send_lq_cmd(lq_sta->drv, ctx, &lq_sta->lq, CMD_ASYNC,
366 false);
367 }
368 }
369 #endif
370
371 /*
372 get the traffic load value for tid
373 */
374 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
375 {
376 u32 curr_time = jiffies_to_msecs(jiffies);
377 u32 time_diff;
378 s32 index;
379 struct iwl_traffic_load *tl = NULL;
380
381 if (tid >= IWL_MAX_TID_COUNT)
382 return 0;
383
384 tl = &(lq_data->load[tid]);
385
386 curr_time -= curr_time % TID_ROUND_VALUE;
387
388 if (!(tl->queue_count))
389 return 0;
390
391 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
392 index = time_diff / TID_QUEUE_CELL_SPACING;
393
394 /* The history is too long: remove data that is older than */
395 /* TID_MAX_TIME_DIFF */
396 if (index >= TID_QUEUE_MAX_SIZE)
397 rs_tl_rm_old_stats(tl, curr_time);
398
399 return tl->total;
400 }
401
402 static int rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
403 struct iwl_lq_sta *lq_data, u8 tid,
404 struct ieee80211_sta *sta)
405 {
406 int ret = -EAGAIN;
407 u32 load;
408
409 /*
410 * Don't create TX aggregation sessions when in high
411 * BT traffic, as they would just be disrupted by BT.
412 */
413 if (priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) {
414 IWL_ERR(priv, "BT traffic (%d), no aggregation allowed\n",
415 priv->bt_traffic_load);
416 return ret;
417 }
418
419 load = rs_tl_get_load(lq_data, tid);
420
421 if ((iwlwifi_mod_params.auto_agg) || (load > IWL_AGG_LOAD_THRESHOLD)) {
422 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
423 sta->addr, tid);
424 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
425 if (ret == -EAGAIN) {
426 /*
427 * driver and mac80211 is out of sync
428 * this might be cause by reloading firmware
429 * stop the tx ba session here
430 */
431 IWL_ERR(priv, "Fail start Tx agg on tid: %d\n",
432 tid);
433 ieee80211_stop_tx_ba_session(sta, tid);
434 }
435 } else {
436 IWL_DEBUG_HT(priv, "Aggregation not enabled for tid %d "
437 "because load = %u\n", tid, load);
438 }
439 return ret;
440 }
441
442 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
443 struct iwl_lq_sta *lq_data,
444 struct ieee80211_sta *sta)
445 {
446 if (tid < IWL_MAX_TID_COUNT)
447 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
448 else
449 IWL_ERR(priv, "tid exceeds max TID count: %d/%d\n",
450 tid, IWL_MAX_TID_COUNT);
451 }
452
453 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
454 {
455 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
456 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
457 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
458 }
459
460 /*
461 * Static function to get the expected throughput from an iwl_scale_tbl_info
462 * that wraps a NULL pointer check
463 */
464 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
465 {
466 if (tbl->expected_tpt)
467 return tbl->expected_tpt[rs_index];
468 return 0;
469 }
470
471 /**
472 * rs_collect_tx_data - Update the success/failure sliding window
473 *
474 * We keep a sliding window of the last 62 packets transmitted
475 * at this rate. window->data contains the bitmask of successful
476 * packets.
477 */
478 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
479 int scale_index, int attempts, int successes)
480 {
481 struct iwl_rate_scale_data *window = NULL;
482 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
483 s32 fail_count, tpt;
484
485 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
486 return -EINVAL;
487
488 /* Select window for current tx bit rate */
489 window = &(tbl->win[scale_index]);
490
491 /* Get expected throughput */
492 tpt = get_expected_tpt(tbl, scale_index);
493
494 /*
495 * Keep track of only the latest 62 tx frame attempts in this rate's
496 * history window; anything older isn't really relevant any more.
497 * If we have filled up the sliding window, drop the oldest attempt;
498 * if the oldest attempt (highest bit in bitmap) shows "success",
499 * subtract "1" from the success counter (this is the main reason
500 * we keep these bitmaps!).
501 */
502 while (attempts > 0) {
503 if (window->counter >= IWL_RATE_MAX_WINDOW) {
504
505 /* remove earliest */
506 window->counter = IWL_RATE_MAX_WINDOW - 1;
507
508 if (window->data & mask) {
509 window->data &= ~mask;
510 window->success_counter--;
511 }
512 }
513
514 /* Increment frames-attempted counter */
515 window->counter++;
516
517 /* Shift bitmap by one frame to throw away oldest history */
518 window->data <<= 1;
519
520 /* Mark the most recent #successes attempts as successful */
521 if (successes > 0) {
522 window->success_counter++;
523 window->data |= 0x1;
524 successes--;
525 }
526
527 attempts--;
528 }
529
530 /* Calculate current success ratio, avoid divide-by-0! */
531 if (window->counter > 0)
532 window->success_ratio = 128 * (100 * window->success_counter)
533 / window->counter;
534 else
535 window->success_ratio = IWL_INVALID_VALUE;
536
537 fail_count = window->counter - window->success_counter;
538
539 /* Calculate average throughput, if we have enough history. */
540 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
541 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
542 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
543 else
544 window->average_tpt = IWL_INVALID_VALUE;
545
546 /* Tag this window as having been updated */
547 window->stamp = jiffies;
548
549 return 0;
550 }
551
552 /*
553 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
554 */
555 /* FIXME:RS:remove this function and put the flags statically in the table */
556 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
557 struct iwl_scale_tbl_info *tbl,
558 int index, u8 use_green)
559 {
560 u32 rate_n_flags = 0;
561
562 if (is_legacy(tbl->lq_type)) {
563 rate_n_flags = iwl_rates[index].plcp;
564 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
565 rate_n_flags |= RATE_MCS_CCK_MSK;
566
567 } else if (is_Ht(tbl->lq_type)) {
568 if (index > IWL_LAST_OFDM_RATE) {
569 IWL_ERR(priv, "Invalid HT rate index %d\n", index);
570 index = IWL_LAST_OFDM_RATE;
571 }
572 rate_n_flags = RATE_MCS_HT_MSK;
573
574 if (is_siso(tbl->lq_type))
575 rate_n_flags |= iwl_rates[index].plcp_siso;
576 else if (is_mimo2(tbl->lq_type))
577 rate_n_flags |= iwl_rates[index].plcp_mimo2;
578 else
579 rate_n_flags |= iwl_rates[index].plcp_mimo3;
580 } else {
581 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
582 }
583
584 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
585 RATE_MCS_ANT_ABC_MSK);
586
587 if (is_Ht(tbl->lq_type)) {
588 if (tbl->is_ht40) {
589 if (tbl->is_dup)
590 rate_n_flags |= RATE_MCS_DUP_MSK;
591 else
592 rate_n_flags |= RATE_MCS_HT40_MSK;
593 }
594 if (tbl->is_SGI)
595 rate_n_flags |= RATE_MCS_SGI_MSK;
596
597 if (use_green) {
598 rate_n_flags |= RATE_MCS_GF_MSK;
599 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
600 rate_n_flags &= ~RATE_MCS_SGI_MSK;
601 IWL_ERR(priv, "GF was set with SGI:SISO\n");
602 }
603 }
604 }
605 return rate_n_flags;
606 }
607
608 /*
609 * Interpret uCode API's rate_n_flags format,
610 * fill "search" or "active" tx mode table.
611 */
612 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
613 enum ieee80211_band band,
614 struct iwl_scale_tbl_info *tbl,
615 int *rate_idx)
616 {
617 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
618 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
619 u8 mcs;
620
621 memset(tbl, 0, sizeof(struct iwl_scale_tbl_info));
622 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
623
624 if (*rate_idx == IWL_RATE_INVALID) {
625 *rate_idx = -1;
626 return -EINVAL;
627 }
628 tbl->is_SGI = 0; /* default legacy setup */
629 tbl->is_ht40 = 0;
630 tbl->is_dup = 0;
631 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
632 tbl->lq_type = LQ_NONE;
633 tbl->max_search = IWL_MAX_SEARCH;
634
635 /* legacy rate format */
636 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
637 if (num_of_ant == 1) {
638 if (band == IEEE80211_BAND_5GHZ)
639 tbl->lq_type = LQ_A;
640 else
641 tbl->lq_type = LQ_G;
642 }
643 /* HT rate format */
644 } else {
645 if (rate_n_flags & RATE_MCS_SGI_MSK)
646 tbl->is_SGI = 1;
647
648 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
649 (rate_n_flags & RATE_MCS_DUP_MSK))
650 tbl->is_ht40 = 1;
651
652 if (rate_n_flags & RATE_MCS_DUP_MSK)
653 tbl->is_dup = 1;
654
655 mcs = rs_extract_rate(rate_n_flags);
656
657 /* SISO */
658 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
659 if (num_of_ant == 1)
660 tbl->lq_type = LQ_SISO; /*else NONE*/
661 /* MIMO2 */
662 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
663 if (num_of_ant == 2)
664 tbl->lq_type = LQ_MIMO2;
665 /* MIMO3 */
666 } else {
667 if (num_of_ant == 3) {
668 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
669 tbl->lq_type = LQ_MIMO3;
670 }
671 }
672 }
673 return 0;
674 }
675
676 /* switch to another antenna/antennas and return 1 */
677 /* if no other valid antenna found, return 0 */
678 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
679 struct iwl_scale_tbl_info *tbl)
680 {
681 u8 new_ant_type;
682
683 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
684 return 0;
685
686 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
687 return 0;
688
689 new_ant_type = ant_toggle_lookup[tbl->ant_type];
690
691 while ((new_ant_type != tbl->ant_type) &&
692 !rs_is_valid_ant(valid_ant, new_ant_type))
693 new_ant_type = ant_toggle_lookup[new_ant_type];
694
695 if (new_ant_type == tbl->ant_type)
696 return 0;
697
698 tbl->ant_type = new_ant_type;
699 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
700 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
701 return 1;
702 }
703
704 /**
705 * Green-field mode is valid if the station supports it and
706 * there are no non-GF stations present in the BSS.
707 */
708 static bool rs_use_green(struct ieee80211_sta *sta)
709 {
710 /*
711 * There's a bug somewhere in this code that causes the
712 * scaling to get stuck because GF+SGI can't be combined
713 * in SISO rates. Until we find that bug, disable GF, it
714 * has only limited benefit and we still interoperate with
715 * GF APs since we can always receive GF transmissions.
716 */
717 return false;
718 }
719
720 /**
721 * rs_get_supported_rates - get the available rates
722 *
723 * if management frame or broadcast frame only return
724 * basic available rates.
725 *
726 */
727 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
728 struct ieee80211_hdr *hdr,
729 enum iwl_table_type rate_type)
730 {
731 if (is_legacy(rate_type)) {
732 return lq_sta->active_legacy_rate;
733 } else {
734 if (is_siso(rate_type))
735 return lq_sta->active_siso_rate;
736 else if (is_mimo2(rate_type))
737 return lq_sta->active_mimo2_rate;
738 else
739 return lq_sta->active_mimo3_rate;
740 }
741 }
742
743 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
744 int rate_type)
745 {
746 u8 high = IWL_RATE_INVALID;
747 u8 low = IWL_RATE_INVALID;
748
749 /* 802.11A or ht walks to the next literal adjacent rate in
750 * the rate table */
751 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
752 int i;
753 u32 mask;
754
755 /* Find the previous rate that is in the rate mask */
756 i = index - 1;
757 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
758 if (rate_mask & mask) {
759 low = i;
760 break;
761 }
762 }
763
764 /* Find the next rate that is in the rate mask */
765 i = index + 1;
766 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
767 if (rate_mask & mask) {
768 high = i;
769 break;
770 }
771 }
772
773 return (high << 8) | low;
774 }
775
776 low = index;
777 while (low != IWL_RATE_INVALID) {
778 low = iwl_rates[low].prev_rs;
779 if (low == IWL_RATE_INVALID)
780 break;
781 if (rate_mask & (1 << low))
782 break;
783 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
784 }
785
786 high = index;
787 while (high != IWL_RATE_INVALID) {
788 high = iwl_rates[high].next_rs;
789 if (high == IWL_RATE_INVALID)
790 break;
791 if (rate_mask & (1 << high))
792 break;
793 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
794 }
795
796 return (high << 8) | low;
797 }
798
799 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
800 struct iwl_scale_tbl_info *tbl,
801 u8 scale_index, u8 ht_possible)
802 {
803 s32 low;
804 u16 rate_mask;
805 u16 high_low;
806 u8 switch_to_legacy = 0;
807 u8 is_green = lq_sta->is_green;
808 struct iwl_priv *priv = lq_sta->drv;
809
810 /* check if we need to switch from HT to legacy rates.
811 * assumption is that mandatory rates (1Mbps or 6Mbps)
812 * are always supported (spec demand) */
813 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
814 switch_to_legacy = 1;
815 scale_index = rs_ht_to_legacy[scale_index];
816 if (lq_sta->band == IEEE80211_BAND_5GHZ)
817 tbl->lq_type = LQ_A;
818 else
819 tbl->lq_type = LQ_G;
820
821 if (num_of_ant(tbl->ant_type) > 1)
822 tbl->ant_type =
823 first_antenna(priv->nvm_data->valid_tx_ant);
824
825 tbl->is_ht40 = 0;
826 tbl->is_SGI = 0;
827 tbl->max_search = IWL_MAX_SEARCH;
828 }
829
830 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
831
832 /* Mask with station rate restriction */
833 if (is_legacy(tbl->lq_type)) {
834 /* supp_rates has no CCK bits in A mode */
835 if (lq_sta->band == IEEE80211_BAND_5GHZ)
836 rate_mask = (u16)(rate_mask &
837 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
838 else
839 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
840 }
841
842 /* If we switched from HT to legacy, check current rate */
843 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
844 low = scale_index;
845 goto out;
846 }
847
848 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
849 tbl->lq_type);
850 low = high_low & 0xff;
851
852 if (low == IWL_RATE_INVALID)
853 low = scale_index;
854
855 out:
856 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
857 }
858
859 /*
860 * Simple function to compare two rate scale table types
861 */
862 static bool table_type_matches(struct iwl_scale_tbl_info *a,
863 struct iwl_scale_tbl_info *b)
864 {
865 return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
866 (a->is_SGI == b->is_SGI);
867 }
868
869 static void rs_bt_update_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
870 struct iwl_lq_sta *lq_sta)
871 {
872 struct iwl_scale_tbl_info *tbl;
873 bool full_concurrent = priv->bt_full_concurrent;
874
875 if (priv->bt_ant_couple_ok) {
876 /*
877 * Is there a need to switch between
878 * full concurrency and 3-wire?
879 */
880 if (priv->bt_ci_compliance && priv->bt_ant_couple_ok)
881 full_concurrent = true;
882 else
883 full_concurrent = false;
884 }
885 if ((priv->bt_traffic_load != priv->last_bt_traffic_load) ||
886 (priv->bt_full_concurrent != full_concurrent)) {
887 priv->bt_full_concurrent = full_concurrent;
888 priv->last_bt_traffic_load = priv->bt_traffic_load;
889
890 /* Update uCode's rate table. */
891 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
892 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
893 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
894
895 queue_work(priv->workqueue, &priv->bt_full_concurrency);
896 }
897 }
898
899 /*
900 * mac80211 sends us Tx status
901 */
902 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
903 struct ieee80211_sta *sta, void *priv_sta,
904 struct sk_buff *skb)
905 {
906 int legacy_success;
907 int retries;
908 int rs_index, mac_index, i;
909 struct iwl_lq_sta *lq_sta = priv_sta;
910 struct iwl_link_quality_cmd *table;
911 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
912 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)priv_r;
913 struct iwl_priv *priv = IWL_OP_MODE_GET_DVM(op_mode);
914 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
915 enum mac80211_rate_control_flags mac_flags;
916 u32 tx_rate;
917 struct iwl_scale_tbl_info tbl_type;
918 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
919 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
920 struct iwl_rxon_context *ctx = sta_priv->ctx;
921
922 IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
923
924 /* Treat uninitialized rate scaling data same as non-existing. */
925 if (!lq_sta) {
926 IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n");
927 return;
928 } else if (!lq_sta->drv) {
929 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
930 return;
931 }
932
933 if (!ieee80211_is_data(hdr->frame_control) ||
934 info->flags & IEEE80211_TX_CTL_NO_ACK)
935 return;
936
937 /* This packet was aggregated but doesn't carry status info */
938 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
939 !(info->flags & IEEE80211_TX_STAT_AMPDU))
940 return;
941
942 /*
943 * Ignore this Tx frame response if its initial rate doesn't match
944 * that of latest Link Quality command. There may be stragglers
945 * from a previous Link Quality command, but we're no longer interested
946 * in those; they're either from the "active" mode while we're trying
947 * to check "search" mode, or a prior "search" mode after we've moved
948 * to a new "search" mode (which might become the new "active" mode).
949 */
950 table = &lq_sta->lq;
951 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
952 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
953 if (priv->band == IEEE80211_BAND_5GHZ)
954 rs_index -= IWL_FIRST_OFDM_RATE;
955 mac_flags = info->status.rates[0].flags;
956 mac_index = info->status.rates[0].idx;
957 /* For HT packets, map MCS to PLCP */
958 if (mac_flags & IEEE80211_TX_RC_MCS) {
959 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
960 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
961 mac_index++;
962 /*
963 * mac80211 HT index is always zero-indexed; we need to move
964 * HT OFDM rates after CCK rates in 2.4 GHz band
965 */
966 if (priv->band == IEEE80211_BAND_2GHZ)
967 mac_index += IWL_FIRST_OFDM_RATE;
968 }
969 /* Here we actually compare this rate to the latest LQ command */
970 if ((mac_index < 0) ||
971 (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
972 (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
973 (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
974 (tbl_type.ant_type != info->status.antenna) ||
975 (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
976 (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
977 (rs_index != mac_index)) {
978 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate);
979 /*
980 * Since rates mis-match, the last LQ command may have failed.
981 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
982 * ... driver.
983 */
984 lq_sta->missed_rate_counter++;
985 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
986 lq_sta->missed_rate_counter = 0;
987 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
988 }
989 /* Regardless, ignore this status info for outdated rate */
990 return;
991 } else
992 /* Rate did match, so reset the missed_rate_counter */
993 lq_sta->missed_rate_counter = 0;
994
995 /* Figure out if rate scale algorithm is in active or search table */
996 if (table_type_matches(&tbl_type,
997 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
998 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
999 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1000 } else if (table_type_matches(&tbl_type,
1001 &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
1002 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1003 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1004 } else {
1005 IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n");
1006 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1007 IWL_DEBUG_RATE(priv, "active- lq:%x, ant:%x, SGI:%d\n",
1008 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
1009 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1010 IWL_DEBUG_RATE(priv, "search- lq:%x, ant:%x, SGI:%d\n",
1011 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
1012 IWL_DEBUG_RATE(priv, "actual- lq:%x, ant:%x, SGI:%d\n",
1013 tbl_type.lq_type, tbl_type.ant_type, tbl_type.is_SGI);
1014 /*
1015 * no matching table found, let's by-pass the data collection
1016 * and continue to perform rate scale to find the rate table
1017 */
1018 rs_stay_in_table(lq_sta, true);
1019 goto done;
1020 }
1021
1022 /*
1023 * Updating the frame history depends on whether packets were
1024 * aggregated.
1025 *
1026 * For aggregation, all packets were transmitted at the same rate, the
1027 * first index into rate scale table.
1028 */
1029 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1030 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
1031 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
1032 &rs_index);
1033 rs_collect_tx_data(curr_tbl, rs_index,
1034 info->status.ampdu_len,
1035 info->status.ampdu_ack_len);
1036
1037 /* Update success/fail counts if not searching for new mode */
1038 if (lq_sta->stay_in_tbl) {
1039 lq_sta->total_success += info->status.ampdu_ack_len;
1040 lq_sta->total_failed += (info->status.ampdu_len -
1041 info->status.ampdu_ack_len);
1042 }
1043 } else {
1044 /*
1045 * For legacy, update frame history with for each Tx retry.
1046 */
1047 retries = info->status.rates[0].count - 1;
1048 /* HW doesn't send more than 15 retries */
1049 retries = min(retries, 15);
1050
1051 /* The last transmission may have been successful */
1052 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1053 /* Collect data for each rate used during failed TX attempts */
1054 for (i = 0; i <= retries; ++i) {
1055 tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
1056 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
1057 &tbl_type, &rs_index);
1058 /*
1059 * Only collect stats if retried rate is in the same RS
1060 * table as active/search.
1061 */
1062 if (table_type_matches(&tbl_type, curr_tbl))
1063 tmp_tbl = curr_tbl;
1064 else if (table_type_matches(&tbl_type, other_tbl))
1065 tmp_tbl = other_tbl;
1066 else
1067 continue;
1068 rs_collect_tx_data(tmp_tbl, rs_index, 1,
1069 i < retries ? 0 : legacy_success);
1070 }
1071
1072 /* Update success/fail counts if not searching for new mode */
1073 if (lq_sta->stay_in_tbl) {
1074 lq_sta->total_success += legacy_success;
1075 lq_sta->total_failed += retries + (1 - legacy_success);
1076 }
1077 }
1078 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1079 lq_sta->last_rate_n_flags = tx_rate;
1080 done:
1081 /* See if there's a better rate or modulation mode to try. */
1082 if (sta && sta->supp_rates[sband->band])
1083 rs_rate_scale_perform(priv, skb, sta, lq_sta);
1084
1085 #if defined(CONFIG_MAC80211_DEBUGFS) && defined(CONFIG_IWLWIFI_DEVICE_TESTMODE)
1086 if ((priv->tm_fixed_rate) &&
1087 (priv->tm_fixed_rate != lq_sta->dbg_fixed_rate))
1088 rs_program_fix_rate(priv, lq_sta);
1089 #endif
1090 if (priv->cfg->bt_params && priv->cfg->bt_params->advanced_bt_coexist)
1091 rs_bt_update_lq(priv, ctx, lq_sta);
1092 }
1093
1094 /*
1095 * Begin a period of staying with a selected modulation mode.
1096 * Set "stay_in_tbl" flag to prevent any mode switches.
1097 * Set frame tx success limits according to legacy vs. high-throughput,
1098 * and reset overall (spanning all rates) tx success history statistics.
1099 * These control how long we stay using same modulation mode before
1100 * searching for a new mode.
1101 */
1102 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
1103 struct iwl_lq_sta *lq_sta)
1104 {
1105 IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
1106 lq_sta->stay_in_tbl = 1; /* only place this gets set */
1107 if (is_legacy) {
1108 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1109 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1110 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1111 } else {
1112 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1113 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1114 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1115 }
1116 lq_sta->table_count = 0;
1117 lq_sta->total_failed = 0;
1118 lq_sta->total_success = 0;
1119 lq_sta->flush_timer = jiffies;
1120 lq_sta->action_counter = 0;
1121 }
1122
1123 /*
1124 * Find correct throughput table for given mode of modulation
1125 */
1126 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1127 struct iwl_scale_tbl_info *tbl)
1128 {
1129 /* Used to choose among HT tables */
1130 s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1131
1132 /* Check for invalid LQ type */
1133 if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1134 tbl->expected_tpt = expected_tpt_legacy;
1135 return;
1136 }
1137
1138 /* Legacy rates have only one table */
1139 if (is_legacy(tbl->lq_type)) {
1140 tbl->expected_tpt = expected_tpt_legacy;
1141 return;
1142 }
1143
1144 /* Choose among many HT tables depending on number of streams
1145 * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
1146 * status */
1147 if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1148 ht_tbl_pointer = expected_tpt_siso20MHz;
1149 else if (is_siso(tbl->lq_type))
1150 ht_tbl_pointer = expected_tpt_siso40MHz;
1151 else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1152 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1153 else if (is_mimo2(tbl->lq_type))
1154 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1155 else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1156 ht_tbl_pointer = expected_tpt_mimo3_20MHz;
1157 else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
1158 ht_tbl_pointer = expected_tpt_mimo3_40MHz;
1159
1160 if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */
1161 tbl->expected_tpt = ht_tbl_pointer[0];
1162 else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */
1163 tbl->expected_tpt = ht_tbl_pointer[1];
1164 else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */
1165 tbl->expected_tpt = ht_tbl_pointer[2];
1166 else /* AGG+SGI */
1167 tbl->expected_tpt = ht_tbl_pointer[3];
1168 }
1169
1170 /*
1171 * Find starting rate for new "search" high-throughput mode of modulation.
1172 * Goal is to find lowest expected rate (under perfect conditions) that is
1173 * above the current measured throughput of "active" mode, to give new mode
1174 * a fair chance to prove itself without too many challenges.
1175 *
1176 * This gets called when transitioning to more aggressive modulation
1177 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1178 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1179 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1180 * bit rate will typically need to increase, but not if performance was bad.
1181 */
1182 static s32 rs_get_best_rate(struct iwl_priv *priv,
1183 struct iwl_lq_sta *lq_sta,
1184 struct iwl_scale_tbl_info *tbl, /* "search" */
1185 u16 rate_mask, s8 index)
1186 {
1187 /* "active" values */
1188 struct iwl_scale_tbl_info *active_tbl =
1189 &(lq_sta->lq_info[lq_sta->active_tbl]);
1190 s32 active_sr = active_tbl->win[index].success_ratio;
1191 s32 active_tpt = active_tbl->expected_tpt[index];
1192
1193 /* expected "search" throughput */
1194 s32 *tpt_tbl = tbl->expected_tpt;
1195
1196 s32 new_rate, high, low, start_hi;
1197 u16 high_low;
1198 s8 rate = index;
1199
1200 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1201
1202 for (; ;) {
1203 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1204 tbl->lq_type);
1205
1206 low = high_low & 0xff;
1207 high = (high_low >> 8) & 0xff;
1208
1209 /*
1210 * Lower the "search" bit rate, to give new "search" mode
1211 * approximately the same throughput as "active" if:
1212 *
1213 * 1) "Active" mode has been working modestly well (but not
1214 * great), and expected "search" throughput (under perfect
1215 * conditions) at candidate rate is above the actual
1216 * measured "active" throughput (but less than expected
1217 * "active" throughput under perfect conditions).
1218 * OR
1219 * 2) "Active" mode has been working perfectly or very well
1220 * and expected "search" throughput (under perfect
1221 * conditions) at candidate rate is above expected
1222 * "active" throughput (under perfect conditions).
1223 */
1224 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1225 ((active_sr > IWL_RATE_DECREASE_TH) &&
1226 (active_sr <= IWL_RATE_HIGH_TH) &&
1227 (tpt_tbl[rate] <= active_tpt))) ||
1228 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1229 (tpt_tbl[rate] > active_tpt))) {
1230
1231 /* (2nd or later pass)
1232 * If we've already tried to raise the rate, and are
1233 * now trying to lower it, use the higher rate. */
1234 if (start_hi != IWL_RATE_INVALID) {
1235 new_rate = start_hi;
1236 break;
1237 }
1238
1239 new_rate = rate;
1240
1241 /* Loop again with lower rate */
1242 if (low != IWL_RATE_INVALID)
1243 rate = low;
1244
1245 /* Lower rate not available, use the original */
1246 else
1247 break;
1248
1249 /* Else try to raise the "search" rate to match "active" */
1250 } else {
1251 /* (2nd or later pass)
1252 * If we've already tried to lower the rate, and are
1253 * now trying to raise it, use the lower rate. */
1254 if (new_rate != IWL_RATE_INVALID)
1255 break;
1256
1257 /* Loop again with higher rate */
1258 else if (high != IWL_RATE_INVALID) {
1259 start_hi = high;
1260 rate = high;
1261
1262 /* Higher rate not available, use the original */
1263 } else {
1264 new_rate = rate;
1265 break;
1266 }
1267 }
1268 }
1269
1270 return new_rate;
1271 }
1272
1273 /*
1274 * Set up search table for MIMO2
1275 */
1276 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1277 struct iwl_lq_sta *lq_sta,
1278 struct ieee80211_conf *conf,
1279 struct ieee80211_sta *sta,
1280 struct iwl_scale_tbl_info *tbl, int index)
1281 {
1282 u16 rate_mask;
1283 s32 rate;
1284 s8 is_green = lq_sta->is_green;
1285 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1286 struct iwl_rxon_context *ctx = sta_priv->ctx;
1287
1288 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1289 return -1;
1290
1291 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1292 == WLAN_HT_CAP_SM_PS_STATIC)
1293 return -1;
1294
1295 /* Need both Tx chains/antennas to support MIMO */
1296 if (priv->hw_params.tx_chains_num < 2)
1297 return -1;
1298
1299 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1300
1301 tbl->lq_type = LQ_MIMO2;
1302 tbl->is_dup = lq_sta->is_dup;
1303 tbl->action = 0;
1304 tbl->max_search = IWL_MAX_SEARCH;
1305 rate_mask = lq_sta->active_mimo2_rate;
1306
1307 if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1308 tbl->is_ht40 = 1;
1309 else
1310 tbl->is_ht40 = 0;
1311
1312 rs_set_expected_tpt_table(lq_sta, tbl);
1313
1314 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1315
1316 IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1317 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1318 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1319 rate, rate_mask);
1320 return -1;
1321 }
1322 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1323
1324 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1325 tbl->current_rate, is_green);
1326 return 0;
1327 }
1328
1329 /*
1330 * Set up search table for MIMO3
1331 */
1332 static int rs_switch_to_mimo3(struct iwl_priv *priv,
1333 struct iwl_lq_sta *lq_sta,
1334 struct ieee80211_conf *conf,
1335 struct ieee80211_sta *sta,
1336 struct iwl_scale_tbl_info *tbl, int index)
1337 {
1338 u16 rate_mask;
1339 s32 rate;
1340 s8 is_green = lq_sta->is_green;
1341 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1342 struct iwl_rxon_context *ctx = sta_priv->ctx;
1343
1344 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1345 return -1;
1346
1347 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1348 == WLAN_HT_CAP_SM_PS_STATIC)
1349 return -1;
1350
1351 /* Need both Tx chains/antennas to support MIMO */
1352 if (priv->hw_params.tx_chains_num < 3)
1353 return -1;
1354
1355 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1356
1357 tbl->lq_type = LQ_MIMO3;
1358 tbl->is_dup = lq_sta->is_dup;
1359 tbl->action = 0;
1360 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1361 rate_mask = lq_sta->active_mimo3_rate;
1362
1363 if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1364 tbl->is_ht40 = 1;
1365 else
1366 tbl->is_ht40 = 0;
1367
1368 rs_set_expected_tpt_table(lq_sta, tbl);
1369
1370 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1371
1372 IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1373 rate, rate_mask);
1374 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1375 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1376 rate, rate_mask);
1377 return -1;
1378 }
1379 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1380
1381 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1382 tbl->current_rate, is_green);
1383 return 0;
1384 }
1385
1386 /*
1387 * Set up search table for SISO
1388 */
1389 static int rs_switch_to_siso(struct iwl_priv *priv,
1390 struct iwl_lq_sta *lq_sta,
1391 struct ieee80211_conf *conf,
1392 struct ieee80211_sta *sta,
1393 struct iwl_scale_tbl_info *tbl, int index)
1394 {
1395 u16 rate_mask;
1396 u8 is_green = lq_sta->is_green;
1397 s32 rate;
1398 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1399 struct iwl_rxon_context *ctx = sta_priv->ctx;
1400
1401 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1402 return -1;
1403
1404 IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1405
1406 tbl->is_dup = lq_sta->is_dup;
1407 tbl->lq_type = LQ_SISO;
1408 tbl->action = 0;
1409 tbl->max_search = IWL_MAX_SEARCH;
1410 rate_mask = lq_sta->active_siso_rate;
1411
1412 if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1413 tbl->is_ht40 = 1;
1414 else
1415 tbl->is_ht40 = 0;
1416
1417 if (is_green)
1418 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1419
1420 rs_set_expected_tpt_table(lq_sta, tbl);
1421 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1422
1423 IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1424 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1425 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1426 rate, rate_mask);
1427 return -1;
1428 }
1429 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1430 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1431 tbl->current_rate, is_green);
1432 return 0;
1433 }
1434
1435 /*
1436 * Try to switch to new modulation mode from legacy
1437 */
1438 static int rs_move_legacy_other(struct iwl_priv *priv,
1439 struct iwl_lq_sta *lq_sta,
1440 struct ieee80211_conf *conf,
1441 struct ieee80211_sta *sta,
1442 int index)
1443 {
1444 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1445 struct iwl_scale_tbl_info *search_tbl =
1446 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1447 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1448 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1449 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1450 u8 start_action;
1451 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1452 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1453 int ret = 0;
1454 u8 update_search_tbl_counter = 0;
1455
1456 switch (priv->bt_traffic_load) {
1457 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1458 /* nothing */
1459 break;
1460 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1461 /* avoid antenna B unless MIMO */
1462 if (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2)
1463 tbl->action = IWL_LEGACY_SWITCH_SISO;
1464 break;
1465 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1466 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1467 /* avoid antenna B and MIMO */
1468 valid_tx_ant =
1469 first_antenna(priv->nvm_data->valid_tx_ant);
1470 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2 &&
1471 tbl->action != IWL_LEGACY_SWITCH_SISO)
1472 tbl->action = IWL_LEGACY_SWITCH_SISO;
1473 break;
1474 default:
1475 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1476 break;
1477 }
1478
1479 if (!iwl_ht_enabled(priv))
1480 /* stay in Legacy */
1481 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1482 else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1483 tbl->action > IWL_LEGACY_SWITCH_SISO)
1484 tbl->action = IWL_LEGACY_SWITCH_SISO;
1485
1486 /* configure as 1x1 if bt full concurrency */
1487 if (priv->bt_full_concurrent) {
1488 if (!iwl_ht_enabled(priv))
1489 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1490 else if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1491 tbl->action = IWL_LEGACY_SWITCH_SISO;
1492 valid_tx_ant =
1493 first_antenna(priv->nvm_data->valid_tx_ant);
1494 }
1495
1496 start_action = tbl->action;
1497 for (; ;) {
1498 lq_sta->action_counter++;
1499 switch (tbl->action) {
1500 case IWL_LEGACY_SWITCH_ANTENNA1:
1501 case IWL_LEGACY_SWITCH_ANTENNA2:
1502 IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1503
1504 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1505 tx_chains_num <= 1) ||
1506 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1507 tx_chains_num <= 2))
1508 break;
1509
1510 /* Don't change antenna if success has been great */
1511 if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1512 !priv->bt_full_concurrent &&
1513 priv->bt_traffic_load ==
1514 IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1515 break;
1516
1517 /* Set up search table to try other antenna */
1518 memcpy(search_tbl, tbl, sz);
1519
1520 if (rs_toggle_antenna(valid_tx_ant,
1521 &search_tbl->current_rate, search_tbl)) {
1522 update_search_tbl_counter = 1;
1523 rs_set_expected_tpt_table(lq_sta, search_tbl);
1524 goto out;
1525 }
1526 break;
1527 case IWL_LEGACY_SWITCH_SISO:
1528 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1529
1530 /* Set up search table to try SISO */
1531 memcpy(search_tbl, tbl, sz);
1532 search_tbl->is_SGI = 0;
1533 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1534 search_tbl, index);
1535 if (!ret) {
1536 lq_sta->action_counter = 0;
1537 goto out;
1538 }
1539
1540 break;
1541 case IWL_LEGACY_SWITCH_MIMO2_AB:
1542 case IWL_LEGACY_SWITCH_MIMO2_AC:
1543 case IWL_LEGACY_SWITCH_MIMO2_BC:
1544 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1545
1546 /* Set up search table to try MIMO */
1547 memcpy(search_tbl, tbl, sz);
1548 search_tbl->is_SGI = 0;
1549
1550 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1551 search_tbl->ant_type = ANT_AB;
1552 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1553 search_tbl->ant_type = ANT_AC;
1554 else
1555 search_tbl->ant_type = ANT_BC;
1556
1557 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1558 break;
1559
1560 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1561 search_tbl, index);
1562 if (!ret) {
1563 lq_sta->action_counter = 0;
1564 goto out;
1565 }
1566 break;
1567
1568 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1569 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1570
1571 /* Set up search table to try MIMO3 */
1572 memcpy(search_tbl, tbl, sz);
1573 search_tbl->is_SGI = 0;
1574
1575 search_tbl->ant_type = ANT_ABC;
1576
1577 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1578 break;
1579
1580 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1581 search_tbl, index);
1582 if (!ret) {
1583 lq_sta->action_counter = 0;
1584 goto out;
1585 }
1586 break;
1587 }
1588 tbl->action++;
1589 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1590 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1591
1592 if (tbl->action == start_action)
1593 break;
1594
1595 }
1596 search_tbl->lq_type = LQ_NONE;
1597 return 0;
1598
1599 out:
1600 lq_sta->search_better_tbl = 1;
1601 tbl->action++;
1602 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1603 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1604 if (update_search_tbl_counter)
1605 search_tbl->action = tbl->action;
1606 return 0;
1607
1608 }
1609
1610 /*
1611 * Try to switch to new modulation mode from SISO
1612 */
1613 static int rs_move_siso_to_other(struct iwl_priv *priv,
1614 struct iwl_lq_sta *lq_sta,
1615 struct ieee80211_conf *conf,
1616 struct ieee80211_sta *sta, int index)
1617 {
1618 u8 is_green = lq_sta->is_green;
1619 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1620 struct iwl_scale_tbl_info *search_tbl =
1621 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1622 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1623 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1624 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1625 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1626 u8 start_action;
1627 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1628 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1629 u8 update_search_tbl_counter = 0;
1630 int ret;
1631
1632 switch (priv->bt_traffic_load) {
1633 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1634 /* nothing */
1635 break;
1636 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1637 /* avoid antenna B unless MIMO */
1638 if (tbl->action == IWL_SISO_SWITCH_ANTENNA2)
1639 tbl->action = IWL_SISO_SWITCH_MIMO2_AB;
1640 break;
1641 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1642 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1643 /* avoid antenna B and MIMO */
1644 valid_tx_ant =
1645 first_antenna(priv->nvm_data->valid_tx_ant);
1646 if (tbl->action != IWL_SISO_SWITCH_ANTENNA1)
1647 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1648 break;
1649 default:
1650 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1651 break;
1652 }
1653
1654 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1655 tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1656 /* stay in SISO */
1657 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1658 }
1659
1660 /* configure as 1x1 if bt full concurrency */
1661 if (priv->bt_full_concurrent) {
1662 valid_tx_ant =
1663 first_antenna(priv->nvm_data->valid_tx_ant);
1664 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1665 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1666 }
1667
1668 start_action = tbl->action;
1669 for (;;) {
1670 lq_sta->action_counter++;
1671 switch (tbl->action) {
1672 case IWL_SISO_SWITCH_ANTENNA1:
1673 case IWL_SISO_SWITCH_ANTENNA2:
1674 IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1675 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1676 tx_chains_num <= 1) ||
1677 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1678 tx_chains_num <= 2))
1679 break;
1680
1681 if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1682 !priv->bt_full_concurrent &&
1683 priv->bt_traffic_load ==
1684 IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1685 break;
1686
1687 memcpy(search_tbl, tbl, sz);
1688 if (rs_toggle_antenna(valid_tx_ant,
1689 &search_tbl->current_rate, search_tbl)) {
1690 update_search_tbl_counter = 1;
1691 goto out;
1692 }
1693 break;
1694 case IWL_SISO_SWITCH_MIMO2_AB:
1695 case IWL_SISO_SWITCH_MIMO2_AC:
1696 case IWL_SISO_SWITCH_MIMO2_BC:
1697 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1698 memcpy(search_tbl, tbl, sz);
1699 search_tbl->is_SGI = 0;
1700
1701 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1702 search_tbl->ant_type = ANT_AB;
1703 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1704 search_tbl->ant_type = ANT_AC;
1705 else
1706 search_tbl->ant_type = ANT_BC;
1707
1708 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1709 break;
1710
1711 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1712 search_tbl, index);
1713 if (!ret)
1714 goto out;
1715 break;
1716 case IWL_SISO_SWITCH_GI:
1717 if (!tbl->is_ht40 && !(ht_cap->cap &
1718 IEEE80211_HT_CAP_SGI_20))
1719 break;
1720 if (tbl->is_ht40 && !(ht_cap->cap &
1721 IEEE80211_HT_CAP_SGI_40))
1722 break;
1723
1724 IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1725
1726 memcpy(search_tbl, tbl, sz);
1727 if (is_green) {
1728 if (!tbl->is_SGI)
1729 break;
1730 else
1731 IWL_ERR(priv,
1732 "SGI was set in GF+SISO\n");
1733 }
1734 search_tbl->is_SGI = !tbl->is_SGI;
1735 rs_set_expected_tpt_table(lq_sta, search_tbl);
1736 if (tbl->is_SGI) {
1737 s32 tpt = lq_sta->last_tpt / 100;
1738 if (tpt >= search_tbl->expected_tpt[index])
1739 break;
1740 }
1741 search_tbl->current_rate =
1742 rate_n_flags_from_tbl(priv, search_tbl,
1743 index, is_green);
1744 update_search_tbl_counter = 1;
1745 goto out;
1746 case IWL_SISO_SWITCH_MIMO3_ABC:
1747 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1748 memcpy(search_tbl, tbl, sz);
1749 search_tbl->is_SGI = 0;
1750 search_tbl->ant_type = ANT_ABC;
1751
1752 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1753 break;
1754
1755 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1756 search_tbl, index);
1757 if (!ret)
1758 goto out;
1759 break;
1760 }
1761 tbl->action++;
1762 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1763 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1764
1765 if (tbl->action == start_action)
1766 break;
1767 }
1768 search_tbl->lq_type = LQ_NONE;
1769 return 0;
1770
1771 out:
1772 lq_sta->search_better_tbl = 1;
1773 tbl->action++;
1774 if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1775 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1776 if (update_search_tbl_counter)
1777 search_tbl->action = tbl->action;
1778
1779 return 0;
1780 }
1781
1782 /*
1783 * Try to switch to new modulation mode from MIMO2
1784 */
1785 static int rs_move_mimo2_to_other(struct iwl_priv *priv,
1786 struct iwl_lq_sta *lq_sta,
1787 struct ieee80211_conf *conf,
1788 struct ieee80211_sta *sta, int index)
1789 {
1790 s8 is_green = lq_sta->is_green;
1791 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1792 struct iwl_scale_tbl_info *search_tbl =
1793 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1794 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1795 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1796 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1797 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1798 u8 start_action;
1799 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1800 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1801 u8 update_search_tbl_counter = 0;
1802 int ret;
1803
1804 switch (priv->bt_traffic_load) {
1805 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1806 /* nothing */
1807 break;
1808 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1809 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1810 /* avoid antenna B and MIMO */
1811 if (tbl->action != IWL_MIMO2_SWITCH_SISO_A)
1812 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1813 break;
1814 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1815 /* avoid antenna B unless MIMO */
1816 if (tbl->action == IWL_MIMO2_SWITCH_SISO_B ||
1817 tbl->action == IWL_MIMO2_SWITCH_SISO_C)
1818 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1819 break;
1820 default:
1821 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1822 break;
1823 }
1824
1825 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1826 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1827 tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1828 /* switch in SISO */
1829 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1830 }
1831
1832 /* configure as 1x1 if bt full concurrency */
1833 if (priv->bt_full_concurrent &&
1834 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1835 tbl->action > IWL_MIMO2_SWITCH_SISO_C))
1836 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1837
1838 start_action = tbl->action;
1839 for (;;) {
1840 lq_sta->action_counter++;
1841 switch (tbl->action) {
1842 case IWL_MIMO2_SWITCH_ANTENNA1:
1843 case IWL_MIMO2_SWITCH_ANTENNA2:
1844 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1845
1846 if (tx_chains_num <= 2)
1847 break;
1848
1849 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1850 break;
1851
1852 memcpy(search_tbl, tbl, sz);
1853 if (rs_toggle_antenna(valid_tx_ant,
1854 &search_tbl->current_rate, search_tbl)) {
1855 update_search_tbl_counter = 1;
1856 goto out;
1857 }
1858 break;
1859 case IWL_MIMO2_SWITCH_SISO_A:
1860 case IWL_MIMO2_SWITCH_SISO_B:
1861 case IWL_MIMO2_SWITCH_SISO_C:
1862 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1863
1864 /* Set up new search table for SISO */
1865 memcpy(search_tbl, tbl, sz);
1866
1867 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1868 search_tbl->ant_type = ANT_A;
1869 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1870 search_tbl->ant_type = ANT_B;
1871 else
1872 search_tbl->ant_type = ANT_C;
1873
1874 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1875 break;
1876
1877 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1878 search_tbl, index);
1879 if (!ret)
1880 goto out;
1881
1882 break;
1883
1884 case IWL_MIMO2_SWITCH_GI:
1885 if (!tbl->is_ht40 && !(ht_cap->cap &
1886 IEEE80211_HT_CAP_SGI_20))
1887 break;
1888 if (tbl->is_ht40 && !(ht_cap->cap &
1889 IEEE80211_HT_CAP_SGI_40))
1890 break;
1891
1892 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1893
1894 /* Set up new search table for MIMO2 */
1895 memcpy(search_tbl, tbl, sz);
1896 search_tbl->is_SGI = !tbl->is_SGI;
1897 rs_set_expected_tpt_table(lq_sta, search_tbl);
1898 /*
1899 * If active table already uses the fastest possible
1900 * modulation (dual stream with short guard interval),
1901 * and it's working well, there's no need to look
1902 * for a better type of modulation!
1903 */
1904 if (tbl->is_SGI) {
1905 s32 tpt = lq_sta->last_tpt / 100;
1906 if (tpt >= search_tbl->expected_tpt[index])
1907 break;
1908 }
1909 search_tbl->current_rate =
1910 rate_n_flags_from_tbl(priv, search_tbl,
1911 index, is_green);
1912 update_search_tbl_counter = 1;
1913 goto out;
1914
1915 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1916 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1917 memcpy(search_tbl, tbl, sz);
1918 search_tbl->is_SGI = 0;
1919 search_tbl->ant_type = ANT_ABC;
1920
1921 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1922 break;
1923
1924 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1925 search_tbl, index);
1926 if (!ret)
1927 goto out;
1928
1929 break;
1930 }
1931 tbl->action++;
1932 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1933 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1934
1935 if (tbl->action == start_action)
1936 break;
1937 }
1938 search_tbl->lq_type = LQ_NONE;
1939 return 0;
1940 out:
1941 lq_sta->search_better_tbl = 1;
1942 tbl->action++;
1943 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1944 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1945 if (update_search_tbl_counter)
1946 search_tbl->action = tbl->action;
1947
1948 return 0;
1949
1950 }
1951
1952 /*
1953 * Try to switch to new modulation mode from MIMO3
1954 */
1955 static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1956 struct iwl_lq_sta *lq_sta,
1957 struct ieee80211_conf *conf,
1958 struct ieee80211_sta *sta, int index)
1959 {
1960 s8 is_green = lq_sta->is_green;
1961 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1962 struct iwl_scale_tbl_info *search_tbl =
1963 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1964 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1965 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1966 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1967 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1968 u8 start_action;
1969 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1970 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1971 int ret;
1972 u8 update_search_tbl_counter = 0;
1973
1974 switch (priv->bt_traffic_load) {
1975 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1976 /* nothing */
1977 break;
1978 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1979 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1980 /* avoid antenna B and MIMO */
1981 if (tbl->action != IWL_MIMO3_SWITCH_SISO_A)
1982 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1983 break;
1984 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1985 /* avoid antenna B unless MIMO */
1986 if (tbl->action == IWL_MIMO3_SWITCH_SISO_B ||
1987 tbl->action == IWL_MIMO3_SWITCH_SISO_C)
1988 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1989 break;
1990 default:
1991 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1992 break;
1993 }
1994
1995 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1996 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1997 tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1998 /* switch in SISO */
1999 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
2000 }
2001
2002 /* configure as 1x1 if bt full concurrency */
2003 if (priv->bt_full_concurrent &&
2004 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
2005 tbl->action > IWL_MIMO3_SWITCH_SISO_C))
2006 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
2007
2008 start_action = tbl->action;
2009 for (;;) {
2010 lq_sta->action_counter++;
2011 switch (tbl->action) {
2012 case IWL_MIMO3_SWITCH_ANTENNA1:
2013 case IWL_MIMO3_SWITCH_ANTENNA2:
2014 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
2015
2016 if (tx_chains_num <= 3)
2017 break;
2018
2019 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
2020 break;
2021
2022 memcpy(search_tbl, tbl, sz);
2023 if (rs_toggle_antenna(valid_tx_ant,
2024 &search_tbl->current_rate, search_tbl))
2025 goto out;
2026 break;
2027 case IWL_MIMO3_SWITCH_SISO_A:
2028 case IWL_MIMO3_SWITCH_SISO_B:
2029 case IWL_MIMO3_SWITCH_SISO_C:
2030 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
2031
2032 /* Set up new search table for SISO */
2033 memcpy(search_tbl, tbl, sz);
2034
2035 if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
2036 search_tbl->ant_type = ANT_A;
2037 else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
2038 search_tbl->ant_type = ANT_B;
2039 else
2040 search_tbl->ant_type = ANT_C;
2041
2042 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2043 break;
2044
2045 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
2046 search_tbl, index);
2047 if (!ret)
2048 goto out;
2049
2050 break;
2051
2052 case IWL_MIMO3_SWITCH_MIMO2_AB:
2053 case IWL_MIMO3_SWITCH_MIMO2_AC:
2054 case IWL_MIMO3_SWITCH_MIMO2_BC:
2055 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
2056
2057 memcpy(search_tbl, tbl, sz);
2058 search_tbl->is_SGI = 0;
2059 if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
2060 search_tbl->ant_type = ANT_AB;
2061 else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
2062 search_tbl->ant_type = ANT_AC;
2063 else
2064 search_tbl->ant_type = ANT_BC;
2065
2066 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2067 break;
2068
2069 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
2070 search_tbl, index);
2071 if (!ret)
2072 goto out;
2073
2074 break;
2075
2076 case IWL_MIMO3_SWITCH_GI:
2077 if (!tbl->is_ht40 && !(ht_cap->cap &
2078 IEEE80211_HT_CAP_SGI_20))
2079 break;
2080 if (tbl->is_ht40 && !(ht_cap->cap &
2081 IEEE80211_HT_CAP_SGI_40))
2082 break;
2083
2084 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
2085
2086 /* Set up new search table for MIMO */
2087 memcpy(search_tbl, tbl, sz);
2088 search_tbl->is_SGI = !tbl->is_SGI;
2089 rs_set_expected_tpt_table(lq_sta, search_tbl);
2090 /*
2091 * If active table already uses the fastest possible
2092 * modulation (dual stream with short guard interval),
2093 * and it's working well, there's no need to look
2094 * for a better type of modulation!
2095 */
2096 if (tbl->is_SGI) {
2097 s32 tpt = lq_sta->last_tpt / 100;
2098 if (tpt >= search_tbl->expected_tpt[index])
2099 break;
2100 }
2101 search_tbl->current_rate =
2102 rate_n_flags_from_tbl(priv, search_tbl,
2103 index, is_green);
2104 update_search_tbl_counter = 1;
2105 goto out;
2106 }
2107 tbl->action++;
2108 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2109 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2110
2111 if (tbl->action == start_action)
2112 break;
2113 }
2114 search_tbl->lq_type = LQ_NONE;
2115 return 0;
2116 out:
2117 lq_sta->search_better_tbl = 1;
2118 tbl->action++;
2119 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2120 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2121 if (update_search_tbl_counter)
2122 search_tbl->action = tbl->action;
2123
2124 return 0;
2125
2126 }
2127
2128 /*
2129 * Check whether we should continue using same modulation mode, or
2130 * begin search for a new mode, based on:
2131 * 1) # tx successes or failures while using this mode
2132 * 2) # times calling this function
2133 * 3) elapsed time in this mode (not used, for now)
2134 */
2135 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
2136 {
2137 struct iwl_scale_tbl_info *tbl;
2138 int i;
2139 int active_tbl;
2140 int flush_interval_passed = 0;
2141 struct iwl_priv *priv;
2142
2143 priv = lq_sta->drv;
2144 active_tbl = lq_sta->active_tbl;
2145
2146 tbl = &(lq_sta->lq_info[active_tbl]);
2147
2148 /* If we've been disallowing search, see if we should now allow it */
2149 if (lq_sta->stay_in_tbl) {
2150
2151 /* Elapsed time using current modulation mode */
2152 if (lq_sta->flush_timer)
2153 flush_interval_passed =
2154 time_after(jiffies,
2155 (unsigned long)(lq_sta->flush_timer +
2156 IWL_RATE_SCALE_FLUSH_INTVL));
2157
2158 /*
2159 * Check if we should allow search for new modulation mode.
2160 * If many frames have failed or succeeded, or we've used
2161 * this same modulation for a long time, allow search, and
2162 * reset history stats that keep track of whether we should
2163 * allow a new search. Also (below) reset all bitmaps and
2164 * stats in active history.
2165 */
2166 if (force_search ||
2167 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
2168 (lq_sta->total_success > lq_sta->max_success_limit) ||
2169 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
2170 && (flush_interval_passed))) {
2171 IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n",
2172 lq_sta->total_failed,
2173 lq_sta->total_success,
2174 flush_interval_passed);
2175
2176 /* Allow search for new mode */
2177 lq_sta->stay_in_tbl = 0; /* only place reset */
2178 lq_sta->total_failed = 0;
2179 lq_sta->total_success = 0;
2180 lq_sta->flush_timer = 0;
2181
2182 /*
2183 * Else if we've used this modulation mode enough repetitions
2184 * (regardless of elapsed time or success/failure), reset
2185 * history bitmaps and rate-specific stats for all rates in
2186 * active table.
2187 */
2188 } else {
2189 lq_sta->table_count++;
2190 if (lq_sta->table_count >=
2191 lq_sta->table_count_limit) {
2192 lq_sta->table_count = 0;
2193
2194 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
2195 for (i = 0; i < IWL_RATE_COUNT; i++)
2196 rs_rate_scale_clear_window(
2197 &(tbl->win[i]));
2198 }
2199 }
2200
2201 /* If transitioning to allow "search", reset all history
2202 * bitmaps and stats in active table (this will become the new
2203 * "search" table). */
2204 if (!lq_sta->stay_in_tbl) {
2205 for (i = 0; i < IWL_RATE_COUNT; i++)
2206 rs_rate_scale_clear_window(&(tbl->win[i]));
2207 }
2208 }
2209 }
2210
2211 /*
2212 * setup rate table in uCode
2213 */
2214 static void rs_update_rate_tbl(struct iwl_priv *priv,
2215 struct iwl_rxon_context *ctx,
2216 struct iwl_lq_sta *lq_sta,
2217 struct iwl_scale_tbl_info *tbl,
2218 int index, u8 is_green)
2219 {
2220 u32 rate;
2221
2222 /* Update uCode's rate table. */
2223 rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2224 rs_fill_link_cmd(priv, lq_sta, rate);
2225 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2226 }
2227
2228 /*
2229 * Do rate scaling and search for new modulation mode.
2230 */
2231 static void rs_rate_scale_perform(struct iwl_priv *priv,
2232 struct sk_buff *skb,
2233 struct ieee80211_sta *sta,
2234 struct iwl_lq_sta *lq_sta)
2235 {
2236 struct ieee80211_hw *hw = priv->hw;
2237 struct ieee80211_conf *conf = &hw->conf;
2238 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2239 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2240 int low = IWL_RATE_INVALID;
2241 int high = IWL_RATE_INVALID;
2242 int index;
2243 int i;
2244 struct iwl_rate_scale_data *window = NULL;
2245 int current_tpt = IWL_INVALID_VALUE;
2246 int low_tpt = IWL_INVALID_VALUE;
2247 int high_tpt = IWL_INVALID_VALUE;
2248 u32 fail_count;
2249 s8 scale_action = 0;
2250 u16 rate_mask;
2251 u8 update_lq = 0;
2252 struct iwl_scale_tbl_info *tbl, *tbl1;
2253 u16 rate_scale_index_msk = 0;
2254 u8 is_green = 0;
2255 u8 active_tbl = 0;
2256 u8 done_search = 0;
2257 u16 high_low;
2258 s32 sr;
2259 u8 tid = IWL_MAX_TID_COUNT;
2260 struct iwl_tid_data *tid_data;
2261 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
2262 struct iwl_rxon_context *ctx = sta_priv->ctx;
2263
2264 IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
2265
2266 /* Send management frames and NO_ACK data using lowest rate. */
2267 /* TODO: this could probably be improved.. */
2268 if (!ieee80211_is_data(hdr->frame_control) ||
2269 info->flags & IEEE80211_TX_CTL_NO_ACK)
2270 return;
2271
2272 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
2273
2274 tid = rs_tl_add_packet(lq_sta, hdr);
2275 if ((tid != IWL_MAX_TID_COUNT) &&
2276 (lq_sta->tx_agg_tid_en & (1 << tid))) {
2277 tid_data = &priv->tid_data[lq_sta->lq.sta_id][tid];
2278 if (tid_data->agg.state == IWL_AGG_OFF)
2279 lq_sta->is_agg = 0;
2280 else
2281 lq_sta->is_agg = 1;
2282 } else
2283 lq_sta->is_agg = 0;
2284
2285 /*
2286 * Select rate-scale / modulation-mode table to work with in
2287 * the rest of this function: "search" if searching for better
2288 * modulation mode, or "active" if doing rate scaling within a mode.
2289 */
2290 if (!lq_sta->search_better_tbl)
2291 active_tbl = lq_sta->active_tbl;
2292 else
2293 active_tbl = 1 - lq_sta->active_tbl;
2294
2295 tbl = &(lq_sta->lq_info[active_tbl]);
2296 if (is_legacy(tbl->lq_type))
2297 lq_sta->is_green = 0;
2298 else
2299 lq_sta->is_green = rs_use_green(sta);
2300 is_green = lq_sta->is_green;
2301
2302 /* current tx rate */
2303 index = lq_sta->last_txrate_idx;
2304
2305 IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2306 tbl->lq_type);
2307
2308 /* rates available for this association, and for modulation mode */
2309 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2310
2311 IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
2312
2313 /* mask with station rate restriction */
2314 if (is_legacy(tbl->lq_type)) {
2315 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2316 /* supp_rates has no CCK bits in A mode */
2317 rate_scale_index_msk = (u16) (rate_mask &
2318 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2319 else
2320 rate_scale_index_msk = (u16) (rate_mask &
2321 lq_sta->supp_rates);
2322
2323 } else
2324 rate_scale_index_msk = rate_mask;
2325
2326 if (!rate_scale_index_msk)
2327 rate_scale_index_msk = rate_mask;
2328
2329 if (!((1 << index) & rate_scale_index_msk)) {
2330 IWL_ERR(priv, "Current Rate is not valid\n");
2331 if (lq_sta->search_better_tbl) {
2332 /* revert to active table if search table is not valid*/
2333 tbl->lq_type = LQ_NONE;
2334 lq_sta->search_better_tbl = 0;
2335 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2336 /* get "active" rate info */
2337 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2338 rs_update_rate_tbl(priv, ctx, lq_sta, tbl,
2339 index, is_green);
2340 }
2341 return;
2342 }
2343
2344 /* Get expected throughput table and history window for current rate */
2345 if (!tbl->expected_tpt) {
2346 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2347 return;
2348 }
2349
2350 /* force user max rate if set by user */
2351 if ((lq_sta->max_rate_idx != -1) &&
2352 (lq_sta->max_rate_idx < index)) {
2353 index = lq_sta->max_rate_idx;
2354 update_lq = 1;
2355 window = &(tbl->win[index]);
2356 goto lq_update;
2357 }
2358
2359 window = &(tbl->win[index]);
2360
2361 /*
2362 * If there is not enough history to calculate actual average
2363 * throughput, keep analyzing results of more tx frames, without
2364 * changing rate or mode (bypass most of the rest of this function).
2365 * Set up new rate table in uCode only if old rate is not supported
2366 * in current association (use new rate found above).
2367 */
2368 fail_count = window->counter - window->success_counter;
2369 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2370 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2371 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2372 "for index %d\n",
2373 window->success_counter, window->counter, index);
2374
2375 /* Can't calculate this yet; not enough history */
2376 window->average_tpt = IWL_INVALID_VALUE;
2377
2378 /* Should we stay with this modulation mode,
2379 * or search for a new one? */
2380 rs_stay_in_table(lq_sta, false);
2381
2382 goto out;
2383 }
2384 /* Else we have enough samples; calculate estimate of
2385 * actual average throughput */
2386 if (window->average_tpt != ((window->success_ratio *
2387 tbl->expected_tpt[index] + 64) / 128)) {
2388 IWL_ERR(priv, "expected_tpt should have been calculated by now\n");
2389 window->average_tpt = ((window->success_ratio *
2390 tbl->expected_tpt[index] + 64) / 128);
2391 }
2392
2393 /* If we are searching for better modulation mode, check success. */
2394 if (lq_sta->search_better_tbl &&
2395 (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
2396 /* If good success, continue using the "search" mode;
2397 * no need to send new link quality command, since we're
2398 * continuing to use the setup that we've been trying. */
2399 if (window->average_tpt > lq_sta->last_tpt) {
2400
2401 IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2402 "suc=%d cur-tpt=%d old-tpt=%d\n",
2403 window->success_ratio,
2404 window->average_tpt,
2405 lq_sta->last_tpt);
2406
2407 if (!is_legacy(tbl->lq_type))
2408 lq_sta->enable_counter = 1;
2409
2410 /* Swap tables; "search" becomes "active" */
2411 lq_sta->active_tbl = active_tbl;
2412 current_tpt = window->average_tpt;
2413
2414 /* Else poor success; go back to mode in "active" table */
2415 } else {
2416
2417 IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2418 "suc=%d cur-tpt=%d old-tpt=%d\n",
2419 window->success_ratio,
2420 window->average_tpt,
2421 lq_sta->last_tpt);
2422
2423 /* Nullify "search" table */
2424 tbl->lq_type = LQ_NONE;
2425
2426 /* Revert to "active" table */
2427 active_tbl = lq_sta->active_tbl;
2428 tbl = &(lq_sta->lq_info[active_tbl]);
2429
2430 /* Revert to "active" rate and throughput info */
2431 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2432 current_tpt = lq_sta->last_tpt;
2433
2434 /* Need to set up a new rate table in uCode */
2435 update_lq = 1;
2436 }
2437
2438 /* Either way, we've made a decision; modulation mode
2439 * search is done, allow rate adjustment next time. */
2440 lq_sta->search_better_tbl = 0;
2441 done_search = 1; /* Don't switch modes below! */
2442 goto lq_update;
2443 }
2444
2445 /* (Else) not in search of better modulation mode, try for better
2446 * starting rate, while staying in this mode. */
2447 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2448 tbl->lq_type);
2449 low = high_low & 0xff;
2450 high = (high_low >> 8) & 0xff;
2451
2452 /* If user set max rate, dont allow higher than user constrain */
2453 if ((lq_sta->max_rate_idx != -1) &&
2454 (lq_sta->max_rate_idx < high))
2455 high = IWL_RATE_INVALID;
2456
2457 sr = window->success_ratio;
2458
2459 /* Collect measured throughputs for current and adjacent rates */
2460 current_tpt = window->average_tpt;
2461 if (low != IWL_RATE_INVALID)
2462 low_tpt = tbl->win[low].average_tpt;
2463 if (high != IWL_RATE_INVALID)
2464 high_tpt = tbl->win[high].average_tpt;
2465
2466 scale_action = 0;
2467
2468 /* Too many failures, decrease rate */
2469 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2470 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2471 scale_action = -1;
2472
2473 /* No throughput measured yet for adjacent rates; try increase. */
2474 } else if ((low_tpt == IWL_INVALID_VALUE) &&
2475 (high_tpt == IWL_INVALID_VALUE)) {
2476
2477 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2478 scale_action = 1;
2479 else if (low != IWL_RATE_INVALID)
2480 scale_action = 0;
2481 }
2482
2483 /* Both adjacent throughputs are measured, but neither one has better
2484 * throughput; we're using the best rate, don't change it! */
2485 else if ((low_tpt != IWL_INVALID_VALUE) &&
2486 (high_tpt != IWL_INVALID_VALUE) &&
2487 (low_tpt < current_tpt) &&
2488 (high_tpt < current_tpt))
2489 scale_action = 0;
2490
2491 /* At least one adjacent rate's throughput is measured,
2492 * and may have better performance. */
2493 else {
2494 /* Higher adjacent rate's throughput is measured */
2495 if (high_tpt != IWL_INVALID_VALUE) {
2496 /* Higher rate has better throughput */
2497 if (high_tpt > current_tpt &&
2498 sr >= IWL_RATE_INCREASE_TH) {
2499 scale_action = 1;
2500 } else {
2501 scale_action = 0;
2502 }
2503
2504 /* Lower adjacent rate's throughput is measured */
2505 } else if (low_tpt != IWL_INVALID_VALUE) {
2506 /* Lower rate has better throughput */
2507 if (low_tpt > current_tpt) {
2508 IWL_DEBUG_RATE(priv,
2509 "decrease rate because of low tpt\n");
2510 scale_action = -1;
2511 } else if (sr >= IWL_RATE_INCREASE_TH) {
2512 scale_action = 1;
2513 }
2514 }
2515 }
2516
2517 /* Sanity check; asked for decrease, but success rate or throughput
2518 * has been good at old rate. Don't change it. */
2519 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2520 ((sr > IWL_RATE_HIGH_TH) ||
2521 (current_tpt > (100 * tbl->expected_tpt[low]))))
2522 scale_action = 0;
2523 if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2524 scale_action = -1;
2525 if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
2526 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2527 scale_action = -1;
2528
2529 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2530 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2531 if (lq_sta->last_bt_traffic > priv->bt_traffic_load) {
2532 /*
2533 * don't set scale_action, don't want to scale up if
2534 * the rate scale doesn't otherwise think that is a
2535 * good idea.
2536 */
2537 } else if (lq_sta->last_bt_traffic <= priv->bt_traffic_load) {
2538 scale_action = -1;
2539 }
2540 }
2541 lq_sta->last_bt_traffic = priv->bt_traffic_load;
2542
2543 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2544 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2545 /* search for a new modulation */
2546 rs_stay_in_table(lq_sta, true);
2547 goto lq_update;
2548 }
2549
2550 switch (scale_action) {
2551 case -1:
2552 /* Decrease starting rate, update uCode's rate table */
2553 if (low != IWL_RATE_INVALID) {
2554 update_lq = 1;
2555 index = low;
2556 }
2557
2558 break;
2559 case 1:
2560 /* Increase starting rate, update uCode's rate table */
2561 if (high != IWL_RATE_INVALID) {
2562 update_lq = 1;
2563 index = high;
2564 }
2565
2566 break;
2567 case 0:
2568 /* No change */
2569 default:
2570 break;
2571 }
2572
2573 IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2574 "high %d type %d\n",
2575 index, scale_action, low, high, tbl->lq_type);
2576
2577 lq_update:
2578 /* Replace uCode's rate table for the destination station. */
2579 if (update_lq)
2580 rs_update_rate_tbl(priv, ctx, lq_sta, tbl, index, is_green);
2581
2582 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
2583 /* Should we stay with this modulation mode,
2584 * or search for a new one? */
2585 rs_stay_in_table(lq_sta, false);
2586 }
2587 /*
2588 * Search for new modulation mode if we're:
2589 * 1) Not changing rates right now
2590 * 2) Not just finishing up a search
2591 * 3) Allowing a new search
2592 */
2593 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2594 /* Save current throughput to compare with "search" throughput*/
2595 lq_sta->last_tpt = current_tpt;
2596
2597 /* Select a new "search" modulation mode to try.
2598 * If one is found, set up the new "search" table. */
2599 if (is_legacy(tbl->lq_type))
2600 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2601 else if (is_siso(tbl->lq_type))
2602 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2603 else if (is_mimo2(tbl->lq_type))
2604 rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2605 else
2606 rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2607
2608 /* If new "search" mode was selected, set up in uCode table */
2609 if (lq_sta->search_better_tbl) {
2610 /* Access the "search" table, clear its history. */
2611 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2612 for (i = 0; i < IWL_RATE_COUNT; i++)
2613 rs_rate_scale_clear_window(&(tbl->win[i]));
2614
2615 /* Use new "search" start rate */
2616 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2617
2618 IWL_DEBUG_RATE(priv, "Switch current mcs: %X index: %d\n",
2619 tbl->current_rate, index);
2620 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2621 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2622 } else
2623 done_search = 1;
2624 }
2625
2626 if (done_search && !lq_sta->stay_in_tbl) {
2627 /* If the "active" (non-search) mode was legacy,
2628 * and we've tried switching antennas,
2629 * but we haven't been able to try HT modes (not available),
2630 * stay with best antenna legacy modulation for a while
2631 * before next round of mode comparisons. */
2632 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2633 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2634 lq_sta->action_counter > tbl1->max_search) {
2635 IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2636 rs_set_stay_in_table(priv, 1, lq_sta);
2637 }
2638
2639 /* If we're in an HT mode, and all 3 mode switch actions
2640 * have been tried and compared, stay in this best modulation
2641 * mode for a while before next round of mode comparisons. */
2642 if (lq_sta->enable_counter &&
2643 (lq_sta->action_counter >= tbl1->max_search) &&
2644 iwl_ht_enabled(priv)) {
2645 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2646 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2647 (tid != IWL_MAX_TID_COUNT)) {
2648 u8 sta_id = lq_sta->lq.sta_id;
2649 tid_data = &priv->tid_data[sta_id][tid];
2650 if (tid_data->agg.state == IWL_AGG_OFF) {
2651 IWL_DEBUG_RATE(priv,
2652 "try to aggregate tid %d\n",
2653 tid);
2654 rs_tl_turn_on_agg(priv, tid,
2655 lq_sta, sta);
2656 }
2657 }
2658 rs_set_stay_in_table(priv, 0, lq_sta);
2659 }
2660 }
2661
2662 out:
2663 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2664 lq_sta->last_txrate_idx = index;
2665 }
2666
2667 /**
2668 * rs_initialize_lq - Initialize a station's hardware rate table
2669 *
2670 * The uCode's station table contains a table of fallback rates
2671 * for automatic fallback during transmission.
2672 *
2673 * NOTE: This sets up a default set of values. These will be replaced later
2674 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2675 * rc80211_simple.
2676 *
2677 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2678 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2679 * which requires station table entry to exist).
2680 */
2681 static void rs_initialize_lq(struct iwl_priv *priv,
2682 struct ieee80211_sta *sta,
2683 struct iwl_lq_sta *lq_sta)
2684 {
2685 struct iwl_scale_tbl_info *tbl;
2686 int rate_idx;
2687 int i;
2688 u32 rate;
2689 u8 use_green = rs_use_green(sta);
2690 u8 active_tbl = 0;
2691 u8 valid_tx_ant;
2692 struct iwl_station_priv *sta_priv;
2693 struct iwl_rxon_context *ctx;
2694
2695 if (!sta || !lq_sta)
2696 return;
2697
2698 sta_priv = (void *)sta->drv_priv;
2699 ctx = sta_priv->ctx;
2700
2701 i = lq_sta->last_txrate_idx;
2702
2703 valid_tx_ant = priv->nvm_data->valid_tx_ant;
2704
2705 if (!lq_sta->search_better_tbl)
2706 active_tbl = lq_sta->active_tbl;
2707 else
2708 active_tbl = 1 - lq_sta->active_tbl;
2709
2710 tbl = &(lq_sta->lq_info[active_tbl]);
2711
2712 if ((i < 0) || (i >= IWL_RATE_COUNT))
2713 i = 0;
2714
2715 rate = iwl_rates[i].plcp;
2716 tbl->ant_type = first_antenna(valid_tx_ant);
2717 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2718
2719 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2720 rate |= RATE_MCS_CCK_MSK;
2721
2722 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2723 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2724 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2725
2726 rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2727 tbl->current_rate = rate;
2728 rs_set_expected_tpt_table(lq_sta, tbl);
2729 rs_fill_link_cmd(NULL, lq_sta, rate);
2730 priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2731 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_SYNC, true);
2732 }
2733
2734 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2735 struct ieee80211_tx_rate_control *txrc)
2736 {
2737
2738 struct sk_buff *skb = txrc->skb;
2739 struct ieee80211_supported_band *sband = txrc->sband;
2740 struct iwl_op_mode *op_mode __maybe_unused =
2741 (struct iwl_op_mode *)priv_r;
2742 struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
2743 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2744 struct iwl_lq_sta *lq_sta = priv_sta;
2745 int rate_idx;
2746
2747 IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2748
2749 /* Get max rate if user set max rate */
2750 if (lq_sta) {
2751 lq_sta->max_rate_idx = txrc->max_rate_idx;
2752 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2753 (lq_sta->max_rate_idx != -1))
2754 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2755 if ((lq_sta->max_rate_idx < 0) ||
2756 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2757 lq_sta->max_rate_idx = -1;
2758 }
2759
2760 /* Treat uninitialized rate scaling data same as non-existing. */
2761 if (lq_sta && !lq_sta->drv) {
2762 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
2763 priv_sta = NULL;
2764 }
2765
2766 /* Send management frames and NO_ACK data using lowest rate. */
2767 if (rate_control_send_low(sta, priv_sta, txrc))
2768 return;
2769
2770 rate_idx = lq_sta->last_txrate_idx;
2771
2772 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2773 rate_idx -= IWL_FIRST_OFDM_RATE;
2774 /* 6M and 9M shared same MCS index */
2775 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2776 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2777 IWL_RATE_MIMO3_6M_PLCP)
2778 rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2779 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2780 IWL_RATE_MIMO2_6M_PLCP)
2781 rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2782 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2783 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2784 info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2785 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2786 info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
2787 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2788 info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2789 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2790 info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2791 } else {
2792 /* Check for invalid rates */
2793 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2794 ((sband->band == IEEE80211_BAND_5GHZ) &&
2795 (rate_idx < IWL_FIRST_OFDM_RATE)))
2796 rate_idx = rate_lowest_index(sband, sta);
2797 /* On valid 5 GHz rate, adjust index */
2798 else if (sband->band == IEEE80211_BAND_5GHZ)
2799 rate_idx -= IWL_FIRST_OFDM_RATE;
2800 info->control.rates[0].flags = 0;
2801 }
2802 info->control.rates[0].idx = rate_idx;
2803
2804 }
2805
2806 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2807 gfp_t gfp)
2808 {
2809 struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2810 struct iwl_op_mode *op_mode __maybe_unused =
2811 (struct iwl_op_mode *)priv_rate;
2812 struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
2813
2814 IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2815
2816 return &sta_priv->lq_sta;
2817 }
2818
2819 /*
2820 * Called after adding a new station to initialize rate scaling
2821 */
2822 void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id)
2823 {
2824 int i, j;
2825 struct ieee80211_hw *hw = priv->hw;
2826 struct ieee80211_conf *conf = &priv->hw->conf;
2827 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2828 struct iwl_station_priv *sta_priv;
2829 struct iwl_lq_sta *lq_sta;
2830 struct ieee80211_supported_band *sband;
2831 unsigned long supp; /* must be unsigned long for for_each_set_bit */
2832
2833 sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2834 lq_sta = &sta_priv->lq_sta;
2835 sband = hw->wiphy->bands[conf->channel->band];
2836
2837
2838 lq_sta->lq.sta_id = sta_id;
2839
2840 for (j = 0; j < LQ_SIZE; j++)
2841 for (i = 0; i < IWL_RATE_COUNT; i++)
2842 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2843
2844 lq_sta->flush_timer = 0;
2845 lq_sta->supp_rates = sta->supp_rates[sband->band];
2846 for (j = 0; j < LQ_SIZE; j++)
2847 for (i = 0; i < IWL_RATE_COUNT; i++)
2848 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2849
2850 IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n",
2851 sta_id);
2852 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2853 * the lowest or the highest rate.. Could consider using RSSI from
2854 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2855 * after assoc.. */
2856
2857 lq_sta->is_dup = 0;
2858 lq_sta->max_rate_idx = -1;
2859 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2860 lq_sta->is_green = rs_use_green(sta);
2861 lq_sta->band = sband->band;
2862 /*
2863 * active legacy rates as per supported rates bitmap
2864 */
2865 supp = sta->supp_rates[sband->band];
2866 lq_sta->active_legacy_rate = 0;
2867 for_each_set_bit(i, &supp, BITS_PER_LONG)
2868 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2869
2870 /*
2871 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2872 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2873 */
2874 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2875 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2876 lq_sta->active_siso_rate &= ~((u16)0x2);
2877 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2878
2879 /* Same here */
2880 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2881 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2882 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2883 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2884
2885 lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2886 lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2887 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2888 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2889
2890 IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2891 lq_sta->active_siso_rate,
2892 lq_sta->active_mimo2_rate,
2893 lq_sta->active_mimo3_rate);
2894
2895 /* These values will be overridden later */
2896 lq_sta->lq.general_params.single_stream_ant_msk =
2897 first_antenna(priv->nvm_data->valid_tx_ant);
2898 lq_sta->lq.general_params.dual_stream_ant_msk =
2899 priv->nvm_data->valid_tx_ant &
2900 ~first_antenna(priv->nvm_data->valid_tx_ant);
2901 if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2902 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2903 } else if (num_of_ant(priv->nvm_data->valid_tx_ant) == 2) {
2904 lq_sta->lq.general_params.dual_stream_ant_msk =
2905 priv->nvm_data->valid_tx_ant;
2906 }
2907
2908 /* as default allow aggregation for all tids */
2909 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2910 lq_sta->drv = priv;
2911
2912 /* Set last_txrate_idx to lowest rate */
2913 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2914 if (sband->band == IEEE80211_BAND_5GHZ)
2915 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2916 lq_sta->is_agg = 0;
2917 #ifdef CONFIG_IWLWIFI_DEVICE_TESTMODE
2918 priv->tm_fixed_rate = 0;
2919 #endif
2920 #ifdef CONFIG_MAC80211_DEBUGFS
2921 lq_sta->dbg_fixed_rate = 0;
2922 #endif
2923
2924 rs_initialize_lq(priv, sta, lq_sta);
2925 }
2926
2927 static void rs_fill_link_cmd(struct iwl_priv *priv,
2928 struct iwl_lq_sta *lq_sta, u32 new_rate)
2929 {
2930 struct iwl_scale_tbl_info tbl_type;
2931 int index = 0;
2932 int rate_idx;
2933 int repeat_rate = 0;
2934 u8 ant_toggle_cnt = 0;
2935 u8 use_ht_possible = 1;
2936 u8 valid_tx_ant = 0;
2937 struct iwl_station_priv *sta_priv =
2938 container_of(lq_sta, struct iwl_station_priv, lq_sta);
2939 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2940
2941 /* Override starting rate (index 0) if needed for debug purposes */
2942 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2943
2944 /* Interpret new_rate (rate_n_flags) */
2945 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2946 &tbl_type, &rate_idx);
2947
2948 if (priv && priv->bt_full_concurrent) {
2949 /* 1x1 only */
2950 tbl_type.ant_type =
2951 first_antenna(priv->nvm_data->valid_tx_ant);
2952 }
2953
2954 /* How many times should we repeat the initial rate? */
2955 if (is_legacy(tbl_type.lq_type)) {
2956 ant_toggle_cnt = 1;
2957 repeat_rate = IWL_NUMBER_TRY;
2958 } else {
2959 repeat_rate = min(IWL_HT_NUMBER_TRY,
2960 LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2961 }
2962
2963 lq_cmd->general_params.mimo_delimiter =
2964 is_mimo(tbl_type.lq_type) ? 1 : 0;
2965
2966 /* Fill 1st table entry (index 0) */
2967 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2968
2969 if (num_of_ant(tbl_type.ant_type) == 1) {
2970 lq_cmd->general_params.single_stream_ant_msk =
2971 tbl_type.ant_type;
2972 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2973 lq_cmd->general_params.dual_stream_ant_msk =
2974 tbl_type.ant_type;
2975 } /* otherwise we don't modify the existing value */
2976
2977 index++;
2978 repeat_rate--;
2979 if (priv) {
2980 if (priv->bt_full_concurrent)
2981 valid_tx_ant = ANT_A;
2982 else
2983 valid_tx_ant = priv->nvm_data->valid_tx_ant;
2984 }
2985
2986 /* Fill rest of rate table */
2987 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2988 /* Repeat initial/next rate.
2989 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2990 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2991 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2992 if (is_legacy(tbl_type.lq_type)) {
2993 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2994 ant_toggle_cnt++;
2995 else if (priv &&
2996 rs_toggle_antenna(valid_tx_ant,
2997 &new_rate, &tbl_type))
2998 ant_toggle_cnt = 1;
2999 }
3000
3001 /* Override next rate if needed for debug purposes */
3002 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
3003
3004 /* Fill next table entry */
3005 lq_cmd->rs_table[index].rate_n_flags =
3006 cpu_to_le32(new_rate);
3007 repeat_rate--;
3008 index++;
3009 }
3010
3011 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
3012 &rate_idx);
3013
3014 if (priv && priv->bt_full_concurrent) {
3015 /* 1x1 only */
3016 tbl_type.ant_type =
3017 first_antenna(priv->nvm_data->valid_tx_ant);
3018 }
3019
3020 /* Indicate to uCode which entries might be MIMO.
3021 * If initial rate was MIMO, this will finally end up
3022 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
3023 if (is_mimo(tbl_type.lq_type))
3024 lq_cmd->general_params.mimo_delimiter = index;
3025
3026 /* Get next rate */
3027 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
3028 use_ht_possible);
3029
3030 /* How many times should we repeat the next rate? */
3031 if (is_legacy(tbl_type.lq_type)) {
3032 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
3033 ant_toggle_cnt++;
3034 else if (priv &&
3035 rs_toggle_antenna(valid_tx_ant,
3036 &new_rate, &tbl_type))
3037 ant_toggle_cnt = 1;
3038
3039 repeat_rate = IWL_NUMBER_TRY;
3040 } else {
3041 repeat_rate = IWL_HT_NUMBER_TRY;
3042 }
3043
3044 /* Don't allow HT rates after next pass.
3045 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
3046 use_ht_possible = 0;
3047
3048 /* Override next rate if needed for debug purposes */
3049 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
3050
3051 /* Fill next table entry */
3052 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
3053
3054 index++;
3055 repeat_rate--;
3056 }
3057
3058 lq_cmd->agg_params.agg_frame_cnt_limit =
3059 sta_priv->max_agg_bufsize ?: LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3060 lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
3061
3062 lq_cmd->agg_params.agg_time_limit =
3063 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
3064 /*
3065 * overwrite if needed, pass aggregation time limit
3066 * to uCode in uSec
3067 */
3068 if (priv && priv->cfg->bt_params &&
3069 priv->cfg->bt_params->agg_time_limit &&
3070 priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH)
3071 lq_cmd->agg_params.agg_time_limit =
3072 cpu_to_le16(priv->cfg->bt_params->agg_time_limit);
3073 }
3074
3075 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3076 {
3077 return hw->priv;
3078 }
3079 /* rate scale requires free function to be implemented */
3080 static void rs_free(void *priv_rate)
3081 {
3082 return;
3083 }
3084
3085 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
3086 void *priv_sta)
3087 {
3088 struct iwl_op_mode *op_mode __maybe_unused = priv_r;
3089 struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
3090
3091 IWL_DEBUG_RATE(priv, "enter\n");
3092 IWL_DEBUG_RATE(priv, "leave\n");
3093 }
3094
3095 #ifdef CONFIG_MAC80211_DEBUGFS
3096 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
3097 u32 *rate_n_flags, int index)
3098 {
3099 struct iwl_priv *priv;
3100 u8 valid_tx_ant;
3101 u8 ant_sel_tx;
3102
3103 priv = lq_sta->drv;
3104 valid_tx_ant = priv->nvm_data->valid_tx_ant;
3105 if (lq_sta->dbg_fixed_rate) {
3106 ant_sel_tx =
3107 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
3108 >> RATE_MCS_ANT_POS);
3109 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
3110 *rate_n_flags = lq_sta->dbg_fixed_rate;
3111 IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
3112 } else {
3113 lq_sta->dbg_fixed_rate = 0;
3114 IWL_ERR(priv,
3115 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
3116 ant_sel_tx, valid_tx_ant);
3117 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3118 }
3119 } else {
3120 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3121 }
3122 }
3123
3124 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3125 const char __user *user_buf, size_t count, loff_t *ppos)
3126 {
3127 struct iwl_lq_sta *lq_sta = file->private_data;
3128 struct iwl_priv *priv;
3129 char buf[64];
3130 size_t buf_size;
3131 u32 parsed_rate;
3132
3133
3134 priv = lq_sta->drv;
3135 memset(buf, 0, sizeof(buf));
3136 buf_size = min(count, sizeof(buf) - 1);
3137 if (copy_from_user(buf, user_buf, buf_size))
3138 return -EFAULT;
3139
3140 if (sscanf(buf, "%x", &parsed_rate) == 1)
3141 lq_sta->dbg_fixed_rate = parsed_rate;
3142 else
3143 lq_sta->dbg_fixed_rate = 0;
3144
3145 rs_program_fix_rate(priv, lq_sta);
3146
3147 return count;
3148 }
3149
3150 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3151 char __user *user_buf, size_t count, loff_t *ppos)
3152 {
3153 char *buff;
3154 int desc = 0;
3155 int i = 0;
3156 int index = 0;
3157 ssize_t ret;
3158
3159 struct iwl_lq_sta *lq_sta = file->private_data;
3160 struct iwl_priv *priv;
3161 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3162
3163 priv = lq_sta->drv;
3164 buff = kmalloc(1024, GFP_KERNEL);
3165 if (!buff)
3166 return -ENOMEM;
3167
3168 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3169 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
3170 lq_sta->total_failed, lq_sta->total_success,
3171 lq_sta->active_legacy_rate);
3172 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3173 lq_sta->dbg_fixed_rate);
3174 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3175 (priv->nvm_data->valid_tx_ant & ANT_A) ? "ANT_A," : "",
3176 (priv->nvm_data->valid_tx_ant & ANT_B) ? "ANT_B," : "",
3177 (priv->nvm_data->valid_tx_ant & ANT_C) ? "ANT_C" : "");
3178 desc += sprintf(buff+desc, "lq type %s\n",
3179 (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
3180 if (is_Ht(tbl->lq_type)) {
3181 desc += sprintf(buff+desc, " %s",
3182 (is_siso(tbl->lq_type)) ? "SISO" :
3183 ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
3184 desc += sprintf(buff+desc, " %s",
3185 (tbl->is_ht40) ? "40MHz" : "20MHz");
3186 desc += sprintf(buff+desc, " %s %s %s\n", (tbl->is_SGI) ? "SGI" : "",
3187 (lq_sta->is_green) ? "GF enabled" : "",
3188 (lq_sta->is_agg) ? "AGG on" : "");
3189 }
3190 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3191 lq_sta->last_rate_n_flags);
3192 desc += sprintf(buff+desc, "general:"
3193 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
3194 lq_sta->lq.general_params.flags,
3195 lq_sta->lq.general_params.mimo_delimiter,
3196 lq_sta->lq.general_params.single_stream_ant_msk,
3197 lq_sta->lq.general_params.dual_stream_ant_msk);
3198
3199 desc += sprintf(buff+desc, "agg:"
3200 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3201 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
3202 lq_sta->lq.agg_params.agg_dis_start_th,
3203 lq_sta->lq.agg_params.agg_frame_cnt_limit);
3204
3205 desc += sprintf(buff+desc,
3206 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3207 lq_sta->lq.general_params.start_rate_index[0],
3208 lq_sta->lq.general_params.start_rate_index[1],
3209 lq_sta->lq.general_params.start_rate_index[2],
3210 lq_sta->lq.general_params.start_rate_index[3]);
3211
3212 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3213 index = iwl_hwrate_to_plcp_idx(
3214 le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
3215 if (is_legacy(tbl->lq_type)) {
3216 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
3217 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3218 iwl_rate_mcs[index].mbps);
3219 } else {
3220 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
3221 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3222 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
3223 }
3224 }
3225
3226 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3227 kfree(buff);
3228 return ret;
3229 }
3230
3231 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3232 .write = rs_sta_dbgfs_scale_table_write,
3233 .read = rs_sta_dbgfs_scale_table_read,
3234 .open = simple_open,
3235 .llseek = default_llseek,
3236 };
3237 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3238 char __user *user_buf, size_t count, loff_t *ppos)
3239 {
3240 char *buff;
3241 int desc = 0;
3242 int i, j;
3243 ssize_t ret;
3244
3245 struct iwl_lq_sta *lq_sta = file->private_data;
3246
3247 buff = kmalloc(1024, GFP_KERNEL);
3248 if (!buff)
3249 return -ENOMEM;
3250
3251 for (i = 0; i < LQ_SIZE; i++) {
3252 desc += sprintf(buff+desc,
3253 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
3254 "rate=0x%X\n",
3255 lq_sta->active_tbl == i ? "*" : "x",
3256 lq_sta->lq_info[i].lq_type,
3257 lq_sta->lq_info[i].is_SGI,
3258 lq_sta->lq_info[i].is_ht40,
3259 lq_sta->lq_info[i].is_dup,
3260 lq_sta->is_green,
3261 lq_sta->lq_info[i].current_rate);
3262 for (j = 0; j < IWL_RATE_COUNT; j++) {
3263 desc += sprintf(buff+desc,
3264 "counter=%d success=%d %%=%d\n",
3265 lq_sta->lq_info[i].win[j].counter,
3266 lq_sta->lq_info[i].win[j].success_counter,
3267 lq_sta->lq_info[i].win[j].success_ratio);
3268 }
3269 }
3270 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3271 kfree(buff);
3272 return ret;
3273 }
3274
3275 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3276 .read = rs_sta_dbgfs_stats_table_read,
3277 .open = simple_open,
3278 .llseek = default_llseek,
3279 };
3280
3281 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3282 char __user *user_buf, size_t count, loff_t *ppos)
3283 {
3284 struct iwl_lq_sta *lq_sta = file->private_data;
3285 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3286 char buff[120];
3287 int desc = 0;
3288
3289 if (is_Ht(tbl->lq_type))
3290 desc += sprintf(buff+desc,
3291 "Bit Rate= %d Mb/s\n",
3292 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3293 else
3294 desc += sprintf(buff+desc,
3295 "Bit Rate= %d Mb/s\n",
3296 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3297
3298 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3299 }
3300
3301 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3302 .read = rs_sta_dbgfs_rate_scale_data_read,
3303 .open = simple_open,
3304 .llseek = default_llseek,
3305 };
3306
3307 static void rs_add_debugfs(void *priv, void *priv_sta,
3308 struct dentry *dir)
3309 {
3310 struct iwl_lq_sta *lq_sta = priv_sta;
3311 lq_sta->rs_sta_dbgfs_scale_table_file =
3312 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3313 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3314 lq_sta->rs_sta_dbgfs_stats_table_file =
3315 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3316 lq_sta, &rs_sta_dbgfs_stats_table_ops);
3317 lq_sta->rs_sta_dbgfs_rate_scale_data_file =
3318 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
3319 lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
3320 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
3321 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3322 &lq_sta->tx_agg_tid_en);
3323
3324 }
3325
3326 static void rs_remove_debugfs(void *priv, void *priv_sta)
3327 {
3328 struct iwl_lq_sta *lq_sta = priv_sta;
3329 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3330 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
3331 debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
3332 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
3333 }
3334 #endif
3335
3336 /*
3337 * Initialization of rate scaling information is done by driver after
3338 * the station is added. Since mac80211 calls this function before a
3339 * station is added we ignore it.
3340 */
3341 static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband,
3342 struct ieee80211_sta *sta, void *priv_sta)
3343 {
3344 }
3345 static struct rate_control_ops rs_ops = {
3346 .module = NULL,
3347 .name = RS_NAME,
3348 .tx_status = rs_tx_status,
3349 .get_rate = rs_get_rate,
3350 .rate_init = rs_rate_init_stub,
3351 .alloc = rs_alloc,
3352 .free = rs_free,
3353 .alloc_sta = rs_alloc_sta,
3354 .free_sta = rs_free_sta,
3355 #ifdef CONFIG_MAC80211_DEBUGFS
3356 .add_sta_debugfs = rs_add_debugfs,
3357 .remove_sta_debugfs = rs_remove_debugfs,
3358 #endif
3359 };
3360
3361 int iwlagn_rate_control_register(void)
3362 {
3363 return ieee80211_rate_control_register(&rs_ops);
3364 }
3365
3366 void iwlagn_rate_control_unregister(void)
3367 {
3368 ieee80211_rate_control_unregister(&rs_ops);
3369 }
3370
Linux kernel - Deliverables
This page took 0.160382 seconds and 5 git commands to generate.