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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / drivers / net / wireless / iwlwifi / iwl-agn-rs.c
blob334b5ae8fdd454ac69d9f760e28359e2b97429b7
1 /******************************************************************************
2 *
3 * Copyright(c) 2005 - 2011 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 "iwl-dev.h"
39 #include "iwl-core.h"
40 #include "iwl-agn.h"
41
42 #define RS_NAME "iwl-agn-rs"
43
44 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
45 #define IWL_NUMBER_TRY 1
46 #define IWL_HT_NUMBER_TRY 3
47
48 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
49 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
50 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
51
52 /* max allowed rate miss before sync LQ cmd */
53 #define IWL_MISSED_RATE_MAX 15
54 /* max time to accum history 2 seconds */
55 #define IWL_RATE_SCALE_FLUSH_INTVL (3*HZ)
56
57 static u8 rs_ht_to_legacy[] = {
58 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
59 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
60 IWL_RATE_6M_INDEX,
61 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
62 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
63 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
64 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
65 };
66
67 static const u8 ant_toggle_lookup[] = {
68 /*ANT_NONE -> */ ANT_NONE,
69 /*ANT_A -> */ ANT_B,
70 /*ANT_B -> */ ANT_C,
71 /*ANT_AB -> */ ANT_BC,
72 /*ANT_C -> */ ANT_A,
73 /*ANT_AC -> */ ANT_AB,
74 /*ANT_BC -> */ ANT_AC,
75 /*ANT_ABC -> */ ANT_ABC,
76 };
77
78 #define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np) \
79 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
80 IWL_RATE_SISO_##s##M_PLCP, \
81 IWL_RATE_MIMO2_##s##M_PLCP,\
82 IWL_RATE_MIMO3_##s##M_PLCP,\
83 IWL_RATE_##r##M_IEEE, \
84 IWL_RATE_##ip##M_INDEX, \
85 IWL_RATE_##in##M_INDEX, \
86 IWL_RATE_##rp##M_INDEX, \
87 IWL_RATE_##rn##M_INDEX, \
88 IWL_RATE_##pp##M_INDEX, \
89 IWL_RATE_##np##M_INDEX }
90
91 /*
92 * Parameter order:
93 * rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
94 *
95 * If there isn't a valid next or previous rate then INV is used which
96 * maps to IWL_RATE_INVALID
97 *
98 */
99 const struct iwl_rate_info iwl_rates[IWL_RATE_COUNT] = {
100 IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2), /* 1mbps */
101 IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5), /* 2mbps */
102 IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11), /*5.5mbps */
103 IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18), /* 11mbps */
104 IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11), /* 6mbps */
105 IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11), /* 9mbps */
106 IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18), /* 12mbps */
107 IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24), /* 18mbps */
108 IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36), /* 24mbps */
109 IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48), /* 36mbps */
110 IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54), /* 48mbps */
111 IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
112 IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
113 /* FIXME:RS: ^^ should be INV (legacy) */
114 };
115
116 static inline u8 rs_extract_rate(u32 rate_n_flags)
117 {
118 return (u8)(rate_n_flags & RATE_MCS_RATE_MSK);
119 }
120
121 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
122 {
123 int idx = 0;
124
125 /* HT rate format */
126 if (rate_n_flags & RATE_MCS_HT_MSK) {
127 idx = rs_extract_rate(rate_n_flags);
128
129 if (idx >= IWL_RATE_MIMO3_6M_PLCP)
130 idx = idx - IWL_RATE_MIMO3_6M_PLCP;
131 else if (idx >= IWL_RATE_MIMO2_6M_PLCP)
132 idx = idx - IWL_RATE_MIMO2_6M_PLCP;
133
134 idx += IWL_FIRST_OFDM_RATE;
135 /* skip 9M not supported in ht*/
136 if (idx >= IWL_RATE_9M_INDEX)
137 idx += 1;
138 if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE))
139 return idx;
140
141 /* legacy rate format, search for match in table */
142 } else {
143 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
144 if (iwl_rates[idx].plcp ==
145 rs_extract_rate(rate_n_flags))
146 return idx;
147 }
148
149 return -1;
150 }
151
152 static void rs_rate_scale_perform(struct iwl_priv *priv,
153 struct sk_buff *skb,
154 struct ieee80211_sta *sta,
155 struct iwl_lq_sta *lq_sta);
156 static void rs_fill_link_cmd(struct iwl_priv *priv,
157 struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
158 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
159
160
161 #ifdef CONFIG_MAC80211_DEBUGFS
162 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
163 u32 *rate_n_flags, int index);
164 #else
165 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
166 u32 *rate_n_flags, int index)
167 {}
168 #endif
169
170 /**
171 * The following tables contain the expected throughput metrics for all rates
172 *
173 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
174 *
175 * where invalid entries are zeros.
176 *
177 * CCK rates are only valid in legacy table and will only be used in G
178 * (2.4 GHz) band.
179 */
180
181 static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
182 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
183 };
184
185 static s32 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
186 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202}, /* Norm */
187 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210}, /* SGI */
188 {0, 0, 0, 0, 47, 0, 91, 133, 171, 242, 305, 334, 362}, /* AGG */
189 {0, 0, 0, 0, 52, 0, 101, 145, 187, 264, 330, 361, 390}, /* AGG+SGI */
190 };
191
192 static s32 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
193 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
194 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
195 {0, 0, 0, 0, 94, 0, 177, 249, 313, 423, 512, 550, 586}, /* AGG */
196 {0, 0, 0, 0, 104, 0, 193, 270, 338, 454, 545, 584, 620}, /* AGG+SGI */
197 };
198
199 static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
200 {0, 0, 0, 0, 74, 0, 123, 155, 179, 214, 236, 244, 251}, /* Norm */
201 {0, 0, 0, 0, 81, 0, 131, 164, 188, 223, 243, 251, 257}, /* SGI */
202 {0, 0, 0, 0, 89, 0, 167, 235, 296, 402, 488, 526, 560}, /* AGG */
203 {0, 0, 0, 0, 97, 0, 182, 255, 320, 431, 520, 558, 593}, /* AGG+SGI*/
204 };
205
206 static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
207 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
208 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
209 {0, 0, 0, 0, 171, 0, 305, 410, 496, 634, 731, 771, 805}, /* AGG */
210 {0, 0, 0, 0, 186, 0, 329, 439, 527, 667, 764, 803, 838}, /* AGG+SGI */
211 };
212
213 static s32 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = {
214 {0, 0, 0, 0, 99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */
215 {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */
216 {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */
217 {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */
218 };
219
220 static s32 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = {
221 {0, 0, 0, 0, 152, 0, 211, 239, 255, 279, 290, 294, 297}, /* Norm */
222 {0, 0, 0, 0, 160, 0, 219, 245, 261, 284, 294, 297, 300}, /* SGI */
223 {0, 0, 0, 0, 254, 0, 443, 584, 695, 868, 984, 1030, 1070}, /* AGG */
224 {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */
225 };
226
227 /* mbps, mcs */
228 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
229 { "1", "BPSK DSSS"},
230 { "2", "QPSK DSSS"},
231 {"5.5", "BPSK CCK"},
232 { "11", "QPSK CCK"},
233 { "6", "BPSK 1/2"},
234 { "9", "BPSK 1/2"},
235 { "12", "QPSK 1/2"},
236 { "18", "QPSK 3/4"},
237 { "24", "16QAM 1/2"},
238 { "36", "16QAM 3/4"},
239 { "48", "64QAM 2/3"},
240 { "54", "64QAM 3/4"},
241 { "60", "64QAM 5/6"},
242 };
243
244 #define MCS_INDEX_PER_STREAM (8)
245
246 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
247 {
248 window->data = 0;
249 window->success_counter = 0;
250 window->success_ratio = IWL_INVALID_VALUE;
251 window->counter = 0;
252 window->average_tpt = IWL_INVALID_VALUE;
253 window->stamp = 0;
254 }
255
256 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
257 {
258 return (ant_type & valid_antenna) == ant_type;
259 }
260
261 /*
262 * removes the old data from the statistics. All data that is older than
263 * TID_MAX_TIME_DIFF, will be deleted.
264 */
265 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
266 {
267 /* The oldest age we want to keep */
268 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
269
270 while (tl->queue_count &&
271 (tl->time_stamp < oldest_time)) {
272 tl->total -= tl->packet_count[tl->head];
273 tl->packet_count[tl->head] = 0;
274 tl->time_stamp += TID_QUEUE_CELL_SPACING;
275 tl->queue_count--;
276 tl->head++;
277 if (tl->head >= TID_QUEUE_MAX_SIZE)
278 tl->head = 0;
279 }
280 }
281
282 /*
283 * increment traffic load value for tid and also remove
284 * any old values if passed the certain time period
285 */
286 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
287 struct ieee80211_hdr *hdr)
288 {
289 u32 curr_time = jiffies_to_msecs(jiffies);
290 u32 time_diff;
291 s32 index;
292 struct iwl_traffic_load *tl = NULL;
293 u8 tid;
294
295 if (ieee80211_is_data_qos(hdr->frame_control)) {
296 u8 *qc = ieee80211_get_qos_ctl(hdr);
297 tid = qc[0] & 0xf;
298 } else
299 return IWL_MAX_TID_COUNT;
300
301 if (unlikely(tid >= IWL_MAX_TID_COUNT))
302 return IWL_MAX_TID_COUNT;
303
304 tl = &lq_data->load[tid];
305
306 curr_time -= curr_time % TID_ROUND_VALUE;
307
308 /* Happens only for the first packet. Initialize the data */
309 if (!(tl->queue_count)) {
310 tl->total = 1;
311 tl->time_stamp = curr_time;
312 tl->queue_count = 1;
313 tl->head = 0;
314 tl->packet_count[0] = 1;
315 return IWL_MAX_TID_COUNT;
316 }
317
318 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
319 index = time_diff / TID_QUEUE_CELL_SPACING;
320
321 /* The history is too long: remove data that is older than */
322 /* TID_MAX_TIME_DIFF */
323 if (index >= TID_QUEUE_MAX_SIZE)
324 rs_tl_rm_old_stats(tl, curr_time);
325
326 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
327 tl->packet_count[index] = tl->packet_count[index] + 1;
328 tl->total = tl->total + 1;
329
330 if ((index + 1) > tl->queue_count)
331 tl->queue_count = index + 1;
332
333 return tid;
334 }
335
336 #ifdef CONFIG_MAC80211_DEBUGFS
337 /**
338 * Program the device to use fixed rate for frame transmit
339 * This is for debugging/testing only
340 * once the device start use fixed rate, we need to reload the module
341 * to being back the normal operation.
342 */
343 static void rs_program_fix_rate(struct iwl_priv *priv,
344 struct iwl_lq_sta *lq_sta)
345 {
346 struct iwl_station_priv *sta_priv =
347 container_of(lq_sta, struct iwl_station_priv, lq_sta);
348 struct iwl_rxon_context *ctx = sta_priv->ctx;
349
350 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
351 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
352 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
353 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
354
355 #ifdef CONFIG_IWLWIFI_DEVICE_TESTMODE
356 /* testmode has higher priority to overwirte the fixed rate */
357 if (priv->tm_fixed_rate)
358 lq_sta->dbg_fixed_rate = priv->tm_fixed_rate;
359 #endif
360
361 IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
362 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
363
364 if (lq_sta->dbg_fixed_rate) {
365 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
366 iwl_send_lq_cmd(lq_sta->drv, ctx, &lq_sta->lq, CMD_ASYNC,
367 false);
368 }
369 }
370 #endif
371
372 /*
373 get the traffic load value for tid
374 */
375 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
376 {
377 u32 curr_time = jiffies_to_msecs(jiffies);
378 u32 time_diff;
379 s32 index;
380 struct iwl_traffic_load *tl = NULL;
381
382 if (tid >= IWL_MAX_TID_COUNT)
383 return 0;
384
385 tl = &(lq_data->load[tid]);
386
387 curr_time -= curr_time % TID_ROUND_VALUE;
388
389 if (!(tl->queue_count))
390 return 0;
391
392 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
393 index = time_diff / TID_QUEUE_CELL_SPACING;
394
395 /* The history is too long: remove data that is older than */
396 /* TID_MAX_TIME_DIFF */
397 if (index >= TID_QUEUE_MAX_SIZE)
398 rs_tl_rm_old_stats(tl, curr_time);
399
400 return tl->total;
401 }
402
403 static int rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
404 struct iwl_lq_sta *lq_data, u8 tid,
405 struct ieee80211_sta *sta)
406 {
407 int ret = -EAGAIN;
408 u32 load;
409
410 /*
411 * Don't create TX aggregation sessions when in high
412 * BT traffic, as they would just be disrupted by BT.
413 */
414 if (priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) {
415 IWL_ERR(priv, "BT traffic (%d), no aggregation allowed\n",
416 priv->bt_traffic_load);
417 return ret;
418 }
419
420 load = rs_tl_get_load(lq_data, tid);
421
422 if ((iwlagn_mod_params.auto_agg) || (load > IWL_AGG_LOAD_THRESHOLD)) {
423 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
424 sta->addr, tid);
425 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
426 if (ret == -EAGAIN) {
427 /*
428 * driver and mac80211 is out of sync
429 * this might be cause by reloading firmware
430 * stop the tx ba session here
431 */
432 IWL_ERR(priv, "Fail start Tx agg on tid: %d\n",
433 tid);
434 ieee80211_stop_tx_ba_session(sta, tid);
435 }
436 } else {
437 IWL_DEBUG_HT(priv, "Aggregation not enabled for tid %d "
438 "because load = %u\n", tid, load);
439 }
440 return ret;
441 }
442
443 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
444 struct iwl_lq_sta *lq_data,
445 struct ieee80211_sta *sta)
446 {
447 if (tid < IWL_MAX_TID_COUNT)
448 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
449 else
450 IWL_ERR(priv, "tid exceeds max TID count: %d/%d\n",
451 tid, IWL_MAX_TID_COUNT);
452 }
453
454 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
455 {
456 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
457 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
458 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
459 }
460
461 /*
462 * Static function to get the expected throughput from an iwl_scale_tbl_info
463 * that wraps a NULL pointer check
464 */
465 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
466 {
467 if (tbl->expected_tpt)
468 return tbl->expected_tpt[rs_index];
469 return 0;
470 }
471
472 /**
473 * rs_collect_tx_data - Update the success/failure sliding window
474 *
475 * We keep a sliding window of the last 62 packets transmitted
476 * at this rate. window->data contains the bitmask of successful
477 * packets.
478 */
479 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
480 int scale_index, int attempts, int successes)
481 {
482 struct iwl_rate_scale_data *window = NULL;
483 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
484 s32 fail_count, tpt;
485
486 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
487 return -EINVAL;
488
489 /* Select window for current tx bit rate */
490 window = &(tbl->win[scale_index]);
491
492 /* Get expected throughput */
493 tpt = get_expected_tpt(tbl, scale_index);
494
495 /*
496 * Keep track of only the latest 62 tx frame attempts in this rate's
497 * history window; anything older isn't really relevant any more.
498 * If we have filled up the sliding window, drop the oldest attempt;
499 * if the oldest attempt (highest bit in bitmap) shows "success",
500 * subtract "1" from the success counter (this is the main reason
501 * we keep these bitmaps!).
502 */
503 while (attempts > 0) {
504 if (window->counter >= IWL_RATE_MAX_WINDOW) {
505
506 /* remove earliest */
507 window->counter = IWL_RATE_MAX_WINDOW - 1;
508
509 if (window->data & mask) {
510 window->data &= ~mask;
511 window->success_counter--;
512 }
513 }
514
515 /* Increment frames-attempted counter */
516 window->counter++;
517
518 /* Shift bitmap by one frame to throw away oldest history */
519 window->data <<= 1;
520
521 /* Mark the most recent #successes attempts as successful */
522 if (successes > 0) {
523 window->success_counter++;
524 window->data |= 0x1;
525 successes--;
526 }
527
528 attempts--;
529 }
530
531 /* Calculate current success ratio, avoid divide-by-0! */
532 if (window->counter > 0)
533 window->success_ratio = 128 * (100 * window->success_counter)
534 / window->counter;
535 else
536 window->success_ratio = IWL_INVALID_VALUE;
537
538 fail_count = window->counter - window->success_counter;
539
540 /* Calculate average throughput, if we have enough history. */
541 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
542 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
543 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
544 else
545 window->average_tpt = IWL_INVALID_VALUE;
546
547 /* Tag this window as having been updated */
548 window->stamp = jiffies;
549
550 return 0;
551 }
552
553 /*
554 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
555 */
556 /* FIXME:RS:remove this function and put the flags statically in the table */
557 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
558 struct iwl_scale_tbl_info *tbl,
559 int index, u8 use_green)
560 {
561 u32 rate_n_flags = 0;
562
563 if (is_legacy(tbl->lq_type)) {
564 rate_n_flags = iwl_rates[index].plcp;
565 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
566 rate_n_flags |= RATE_MCS_CCK_MSK;
567
568 } else if (is_Ht(tbl->lq_type)) {
569 if (index > IWL_LAST_OFDM_RATE) {
570 IWL_ERR(priv, "Invalid HT rate index %d\n", index);
571 index = IWL_LAST_OFDM_RATE;
572 }
573 rate_n_flags = RATE_MCS_HT_MSK;
574
575 if (is_siso(tbl->lq_type))
576 rate_n_flags |= iwl_rates[index].plcp_siso;
577 else if (is_mimo2(tbl->lq_type))
578 rate_n_flags |= iwl_rates[index].plcp_mimo2;
579 else
580 rate_n_flags |= iwl_rates[index].plcp_mimo3;
581 } else {
582 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
583 }
584
585 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
586 RATE_MCS_ANT_ABC_MSK);
587
588 if (is_Ht(tbl->lq_type)) {
589 if (tbl->is_ht40) {
590 if (tbl->is_dup)
591 rate_n_flags |= RATE_MCS_DUP_MSK;
592 else
593 rate_n_flags |= RATE_MCS_HT40_MSK;
594 }
595 if (tbl->is_SGI)
596 rate_n_flags |= RATE_MCS_SGI_MSK;
597
598 if (use_green) {
599 rate_n_flags |= RATE_MCS_GF_MSK;
600 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
601 rate_n_flags &= ~RATE_MCS_SGI_MSK;
602 IWL_ERR(priv, "GF was set with SGI:SISO\n");
603 }
604 }
605 }
606 return rate_n_flags;
607 }
608
609 /*
610 * Interpret uCode API's rate_n_flags format,
611 * fill "search" or "active" tx mode table.
612 */
613 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
614 enum ieee80211_band band,
615 struct iwl_scale_tbl_info *tbl,
616 int *rate_idx)
617 {
618 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
619 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
620 u8 mcs;
621
622 memset(tbl, 0, sizeof(struct iwl_scale_tbl_info));
623 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
624
625 if (*rate_idx == IWL_RATE_INVALID) {
626 *rate_idx = -1;
627 return -EINVAL;
628 }
629 tbl->is_SGI = 0; /* default legacy setup */
630 tbl->is_ht40 = 0;
631 tbl->is_dup = 0;
632 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
633 tbl->lq_type = LQ_NONE;
634 tbl->max_search = IWL_MAX_SEARCH;
635
636 /* legacy rate format */
637 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
638 if (num_of_ant == 1) {
639 if (band == IEEE80211_BAND_5GHZ)
640 tbl->lq_type = LQ_A;
641 else
642 tbl->lq_type = LQ_G;
643 }
644 /* HT rate format */
645 } else {
646 if (rate_n_flags & RATE_MCS_SGI_MSK)
647 tbl->is_SGI = 1;
648
649 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
650 (rate_n_flags & RATE_MCS_DUP_MSK))
651 tbl->is_ht40 = 1;
652
653 if (rate_n_flags & RATE_MCS_DUP_MSK)
654 tbl->is_dup = 1;
655
656 mcs = rs_extract_rate(rate_n_flags);
657
658 /* SISO */
659 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
660 if (num_of_ant == 1)
661 tbl->lq_type = LQ_SISO; /*else NONE*/
662 /* MIMO2 */
663 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
664 if (num_of_ant == 2)
665 tbl->lq_type = LQ_MIMO2;
666 /* MIMO3 */
667 } else {
668 if (num_of_ant == 3) {
669 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
670 tbl->lq_type = LQ_MIMO3;
671 }
672 }
673 }
674 return 0;
675 }
676
677 /* switch to another antenna/antennas and return 1 */
678 /* if no other valid antenna found, return 0 */
679 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
680 struct iwl_scale_tbl_info *tbl)
681 {
682 u8 new_ant_type;
683
684 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
685 return 0;
686
687 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
688 return 0;
689
690 new_ant_type = ant_toggle_lookup[tbl->ant_type];
691
692 while ((new_ant_type != tbl->ant_type) &&
693 !rs_is_valid_ant(valid_ant, new_ant_type))
694 new_ant_type = ant_toggle_lookup[new_ant_type];
695
696 if (new_ant_type == tbl->ant_type)
697 return 0;
698
699 tbl->ant_type = new_ant_type;
700 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
701 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
702 return 1;
703 }
704
705 /**
706 * Green-field mode is valid if the station supports it and
707 * there are no non-GF stations present in the BSS.
708 */
709 static bool rs_use_green(struct ieee80211_sta *sta)
710 {
711 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
712 struct iwl_rxon_context *ctx = sta_priv->ctx;
713
714 return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
715 !(ctx->ht.non_gf_sta_present);
716 }
717
718 /**
719 * rs_get_supported_rates - get the available rates
720 *
721 * if management frame or broadcast frame only return
722 * basic available rates.
723 *
724 */
725 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
726 struct ieee80211_hdr *hdr,
727 enum iwl_table_type rate_type)
728 {
729 if (is_legacy(rate_type)) {
730 return lq_sta->active_legacy_rate;
731 } else {
732 if (is_siso(rate_type))
733 return lq_sta->active_siso_rate;
734 else if (is_mimo2(rate_type))
735 return lq_sta->active_mimo2_rate;
736 else
737 return lq_sta->active_mimo3_rate;
738 }
739 }
740
741 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
742 int rate_type)
743 {
744 u8 high = IWL_RATE_INVALID;
745 u8 low = IWL_RATE_INVALID;
746
747 /* 802.11A or ht walks to the next literal adjacent rate in
748 * the rate table */
749 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
750 int i;
751 u32 mask;
752
753 /* Find the previous rate that is in the rate mask */
754 i = index - 1;
755 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
756 if (rate_mask & mask) {
757 low = i;
758 break;
759 }
760 }
761
762 /* Find the next rate that is in the rate mask */
763 i = index + 1;
764 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
765 if (rate_mask & mask) {
766 high = i;
767 break;
768 }
769 }
770
771 return (high << 8) | low;
772 }
773
774 low = index;
775 while (low != IWL_RATE_INVALID) {
776 low = iwl_rates[low].prev_rs;
777 if (low == IWL_RATE_INVALID)
778 break;
779 if (rate_mask & (1 << low))
780 break;
781 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
782 }
783
784 high = index;
785 while (high != IWL_RATE_INVALID) {
786 high = iwl_rates[high].next_rs;
787 if (high == IWL_RATE_INVALID)
788 break;
789 if (rate_mask & (1 << high))
790 break;
791 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
792 }
793
794 return (high << 8) | low;
795 }
796
797 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
798 struct iwl_scale_tbl_info *tbl,
799 u8 scale_index, u8 ht_possible)
800 {
801 s32 low;
802 u16 rate_mask;
803 u16 high_low;
804 u8 switch_to_legacy = 0;
805 u8 is_green = lq_sta->is_green;
806 struct iwl_priv *priv = lq_sta->drv;
807
808 /* check if we need to switch from HT to legacy rates.
809 * assumption is that mandatory rates (1Mbps or 6Mbps)
810 * are always supported (spec demand) */
811 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
812 switch_to_legacy = 1;
813 scale_index = rs_ht_to_legacy[scale_index];
814 if (lq_sta->band == IEEE80211_BAND_5GHZ)
815 tbl->lq_type = LQ_A;
816 else
817 tbl->lq_type = LQ_G;
818
819 if (num_of_ant(tbl->ant_type) > 1)
820 tbl->ant_type =
821 first_antenna(hw_params(priv).valid_tx_ant);
822
823 tbl->is_ht40 = 0;
824 tbl->is_SGI = 0;
825 tbl->max_search = IWL_MAX_SEARCH;
826 }
827
828 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
829
830 /* Mask with station rate restriction */
831 if (is_legacy(tbl->lq_type)) {
832 /* supp_rates has no CCK bits in A mode */
833 if (lq_sta->band == IEEE80211_BAND_5GHZ)
834 rate_mask = (u16)(rate_mask &
835 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
836 else
837 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
838 }
839
840 /* If we switched from HT to legacy, check current rate */
841 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
842 low = scale_index;
843 goto out;
844 }
845
846 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
847 tbl->lq_type);
848 low = high_low & 0xff;
849
850 if (low == IWL_RATE_INVALID)
851 low = scale_index;
852
853 out:
854 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
855 }
856
857 /*
858 * Simple function to compare two rate scale table types
859 */
860 static bool table_type_matches(struct iwl_scale_tbl_info *a,
861 struct iwl_scale_tbl_info *b)
862 {
863 return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
864 (a->is_SGI == b->is_SGI);
865 }
866
867 static void rs_bt_update_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
868 struct iwl_lq_sta *lq_sta)
869 {
870 struct iwl_scale_tbl_info *tbl;
871 bool full_concurrent = priv->bt_full_concurrent;
872 unsigned long flags;
873
874 if (priv->bt_ant_couple_ok) {
875 /*
876 * Is there a need to switch between
877 * full concurrency and 3-wire?
878 */
879 spin_lock_irqsave(&priv->shrd->lock, flags);
880 if (priv->bt_ci_compliance && priv->bt_ant_couple_ok)
881 full_concurrent = true;
882 else
883 full_concurrent = false;
884 spin_unlock_irqrestore(&priv->shrd->lock, flags);
885 }
886 if ((priv->bt_traffic_load != priv->last_bt_traffic_load) ||
887 (priv->bt_full_concurrent != full_concurrent)) {
888 priv->bt_full_concurrent = full_concurrent;
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->shrd->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_priv *priv = (struct iwl_priv *)priv_r;
913 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
914 enum mac80211_rate_control_flags mac_flags;
915 u32 tx_rate;
916 struct iwl_scale_tbl_info tbl_type;
917 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
918 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
919 struct iwl_rxon_context *ctx = sta_priv->ctx;
920
921 IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
922
923 /* Treat uninitialized rate scaling data same as non-existing. */
924 if (!lq_sta) {
925 IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n");
926 return;
927 } else if (!lq_sta->drv) {
928 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
929 return;
930 }
931
932 if (!ieee80211_is_data(hdr->frame_control) ||
933 info->flags & IEEE80211_TX_CTL_NO_ACK)
934 return;
935
936 /* This packet was aggregated but doesn't carry status info */
937 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
938 !(info->flags & IEEE80211_TX_STAT_AMPDU))
939 return;
940
941 /*
942 * Ignore this Tx frame response if its initial rate doesn't match
943 * that of latest Link Quality command. There may be stragglers
944 * from a previous Link Quality command, but we're no longer interested
945 * in those; they're either from the "active" mode while we're trying
946 * to check "search" mode, or a prior "search" mode after we've moved
947 * to a new "search" mode (which might become the new "active" mode).
948 */
949 table = &lq_sta->lq;
950 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
951 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
952 if (priv->band == IEEE80211_BAND_5GHZ)
953 rs_index -= IWL_FIRST_OFDM_RATE;
954 mac_flags = info->status.rates[0].flags;
955 mac_index = info->status.rates[0].idx;
956 /* For HT packets, map MCS to PLCP */
957 if (mac_flags & IEEE80211_TX_RC_MCS) {
958 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
959 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
960 mac_index++;
961 /*
962 * mac80211 HT index is always zero-indexed; we need to move
963 * HT OFDM rates after CCK rates in 2.4 GHz band
964 */
965 if (priv->band == IEEE80211_BAND_2GHZ)
966 mac_index += IWL_FIRST_OFDM_RATE;
967 }
968 /* Here we actually compare this rate to the latest LQ command */
969 if ((mac_index < 0) ||
970 (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
971 (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
972 (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
973 (tbl_type.ant_type != info->antenna_sel_tx) ||
974 (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
975 (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
976 (rs_index != mac_index)) {
977 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate);
978 /*
979 * Since rates mis-match, the last LQ command may have failed.
980 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
981 * ... driver.
982 */
983 lq_sta->missed_rate_counter++;
984 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
985 lq_sta->missed_rate_counter = 0;
986 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
987 }
988 /* Regardless, ignore this status info for outdated rate */
989 return;
990 } else
991 /* Rate did match, so reset the missed_rate_counter */
992 lq_sta->missed_rate_counter = 0;
993
994 /* Figure out if rate scale algorithm is in active or search table */
995 if (table_type_matches(&tbl_type,
996 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
997 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
998 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
999 } else if (table_type_matches(&tbl_type,
1000 &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
1001 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1002 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1003 } else {
1004 IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n");
1005 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1006 IWL_DEBUG_RATE(priv, "active- lq:%x, ant:%x, SGI:%d\n",
1007 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
1008 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1009 IWL_DEBUG_RATE(priv, "search- lq:%x, ant:%x, SGI:%d\n",
1010 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
1011 IWL_DEBUG_RATE(priv, "actual- lq:%x, ant:%x, SGI:%d\n",
1012 tbl_type.lq_type, tbl_type.ant_type, tbl_type.is_SGI);
1013 /*
1014 * no matching table found, let's by-pass the data collection
1015 * and continue to perform rate scale to find the rate table
1016 */
1017 rs_stay_in_table(lq_sta, true);
1018 goto done;
1019 }
1020
1021 /*
1022 * Updating the frame history depends on whether packets were
1023 * aggregated.
1024 *
1025 * For aggregation, all packets were transmitted at the same rate, the
1026 * first index into rate scale table.
1027 */
1028 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1029 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
1030 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
1031 &rs_index);
1032 rs_collect_tx_data(curr_tbl, rs_index,
1033 info->status.ampdu_len,
1034 info->status.ampdu_ack_len);
1035
1036 /* Update success/fail counts if not searching for new mode */
1037 if (lq_sta->stay_in_tbl) {
1038 lq_sta->total_success += info->status.ampdu_ack_len;
1039 lq_sta->total_failed += (info->status.ampdu_len -
1040 info->status.ampdu_ack_len);
1041 }
1042 } else {
1043 /*
1044 * For legacy, update frame history with for each Tx retry.
1045 */
1046 retries = info->status.rates[0].count - 1;
1047 /* HW doesn't send more than 15 retries */
1048 retries = min(retries, 15);
1049
1050 /* The last transmission may have been successful */
1051 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1052 /* Collect data for each rate used during failed TX attempts */
1053 for (i = 0; i <= retries; ++i) {
1054 tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
1055 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
1056 &tbl_type, &rs_index);
1057 /*
1058 * Only collect stats if retried rate is in the same RS
1059 * table as active/search.
1060 */
1061 if (table_type_matches(&tbl_type, curr_tbl))
1062 tmp_tbl = curr_tbl;
1063 else if (table_type_matches(&tbl_type, other_tbl))
1064 tmp_tbl = other_tbl;
1065 else
1066 continue;
1067 rs_collect_tx_data(tmp_tbl, rs_index, 1,
1068 i < retries ? 0 : legacy_success);
1069 }
1070
1071 /* Update success/fail counts if not searching for new mode */
1072 if (lq_sta->stay_in_tbl) {
1073 lq_sta->total_success += legacy_success;
1074 lq_sta->total_failed += retries + (1 - legacy_success);
1075 }
1076 }
1077 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1078 lq_sta->last_rate_n_flags = tx_rate;
1079 done:
1080 /* See if there's a better rate or modulation mode to try. */
1081 if (sta && sta->supp_rates[sband->band])
1082 rs_rate_scale_perform(priv, skb, sta, lq_sta);
1083
1084 #if defined(CONFIG_MAC80211_DEBUGFS) && defined(CONFIG_IWLWIFI_DEVICE_TESTMODE)
1085 if ((priv->tm_fixed_rate) &&
1086 (priv->tm_fixed_rate != lq_sta->dbg_fixed_rate))
1087 rs_program_fix_rate(priv, lq_sta);
1088 #endif
1089 if (cfg(priv)->bt_params && cfg(priv)->bt_params->advanced_bt_coexist)
1090 rs_bt_update_lq(priv, ctx, lq_sta);
1091 }
1092
1093 /*
1094 * Begin a period of staying with a selected modulation mode.
1095 * Set "stay_in_tbl" flag to prevent any mode switches.
1096 * Set frame tx success limits according to legacy vs. high-throughput,
1097 * and reset overall (spanning all rates) tx success history statistics.
1098 * These control how long we stay using same modulation mode before
1099 * searching for a new mode.
1100 */
1101 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
1102 struct iwl_lq_sta *lq_sta)
1103 {
1104 IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
1105 lq_sta->stay_in_tbl = 1; /* only place this gets set */
1106 if (is_legacy) {
1107 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1108 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1109 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1110 } else {
1111 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1112 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1113 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1114 }
1115 lq_sta->table_count = 0;
1116 lq_sta->total_failed = 0;
1117 lq_sta->total_success = 0;
1118 lq_sta->flush_timer = jiffies;
1119 lq_sta->action_counter = 0;
1120 }
1121
1122 /*
1123 * Find correct throughput table for given mode of modulation
1124 */
1125 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1126 struct iwl_scale_tbl_info *tbl)
1127 {
1128 /* Used to choose among HT tables */
1129 s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1130
1131 /* Check for invalid LQ type */
1132 if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1133 tbl->expected_tpt = expected_tpt_legacy;
1134 return;
1135 }
1136
1137 /* Legacy rates have only one table */
1138 if (is_legacy(tbl->lq_type)) {
1139 tbl->expected_tpt = expected_tpt_legacy;
1140 return;
1141 }
1142
1143 /* Choose among many HT tables depending on number of streams
1144 * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
1145 * status */
1146 if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1147 ht_tbl_pointer = expected_tpt_siso20MHz;
1148 else if (is_siso(tbl->lq_type))
1149 ht_tbl_pointer = expected_tpt_siso40MHz;
1150 else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1151 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1152 else if (is_mimo2(tbl->lq_type))
1153 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1154 else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1155 ht_tbl_pointer = expected_tpt_mimo3_20MHz;
1156 else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
1157 ht_tbl_pointer = expected_tpt_mimo3_40MHz;
1158
1159 if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */
1160 tbl->expected_tpt = ht_tbl_pointer[0];
1161 else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */
1162 tbl->expected_tpt = ht_tbl_pointer[1];
1163 else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */
1164 tbl->expected_tpt = ht_tbl_pointer[2];
1165 else /* AGG+SGI */
1166 tbl->expected_tpt = ht_tbl_pointer[3];
1167 }
1168
1169 /*
1170 * Find starting rate for new "search" high-throughput mode of modulation.
1171 * Goal is to find lowest expected rate (under perfect conditions) that is
1172 * above the current measured throughput of "active" mode, to give new mode
1173 * a fair chance to prove itself without too many challenges.
1174 *
1175 * This gets called when transitioning to more aggressive modulation
1176 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1177 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1178 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1179 * bit rate will typically need to increase, but not if performance was bad.
1180 */
1181 static s32 rs_get_best_rate(struct iwl_priv *priv,
1182 struct iwl_lq_sta *lq_sta,
1183 struct iwl_scale_tbl_info *tbl, /* "search" */
1184 u16 rate_mask, s8 index)
1185 {
1186 /* "active" values */
1187 struct iwl_scale_tbl_info *active_tbl =
1188 &(lq_sta->lq_info[lq_sta->active_tbl]);
1189 s32 active_sr = active_tbl->win[index].success_ratio;
1190 s32 active_tpt = active_tbl->expected_tpt[index];
1191
1192 /* expected "search" throughput */
1193 s32 *tpt_tbl = tbl->expected_tpt;
1194
1195 s32 new_rate, high, low, start_hi;
1196 u16 high_low;
1197 s8 rate = index;
1198
1199 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1200
1201 for (; ;) {
1202 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1203 tbl->lq_type);
1204
1205 low = high_low & 0xff;
1206 high = (high_low >> 8) & 0xff;
1207
1208 /*
1209 * Lower the "search" bit rate, to give new "search" mode
1210 * approximately the same throughput as "active" if:
1211 *
1212 * 1) "Active" mode has been working modestly well (but not
1213 * great), and expected "search" throughput (under perfect
1214 * conditions) at candidate rate is above the actual
1215 * measured "active" throughput (but less than expected
1216 * "active" throughput under perfect conditions).
1217 * OR
1218 * 2) "Active" mode has been working perfectly or very well
1219 * and expected "search" throughput (under perfect
1220 * conditions) at candidate rate is above expected
1221 * "active" throughput (under perfect conditions).
1222 */
1223 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1224 ((active_sr > IWL_RATE_DECREASE_TH) &&
1225 (active_sr <= IWL_RATE_HIGH_TH) &&
1226 (tpt_tbl[rate] <= active_tpt))) ||
1227 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1228 (tpt_tbl[rate] > active_tpt))) {
1229
1230 /* (2nd or later pass)
1231 * If we've already tried to raise the rate, and are
1232 * now trying to lower it, use the higher rate. */
1233 if (start_hi != IWL_RATE_INVALID) {
1234 new_rate = start_hi;
1235 break;
1236 }
1237
1238 new_rate = rate;
1239
1240 /* Loop again with lower rate */
1241 if (low != IWL_RATE_INVALID)
1242 rate = low;
1243
1244 /* Lower rate not available, use the original */
1245 else
1246 break;
1247
1248 /* Else try to raise the "search" rate to match "active" */
1249 } else {
1250 /* (2nd or later pass)
1251 * If we've already tried to lower the rate, and are
1252 * now trying to raise it, use the lower rate. */
1253 if (new_rate != IWL_RATE_INVALID)
1254 break;
1255
1256 /* Loop again with higher rate */
1257 else if (high != IWL_RATE_INVALID) {
1258 start_hi = high;
1259 rate = high;
1260
1261 /* Higher rate not available, use the original */
1262 } else {
1263 new_rate = rate;
1264 break;
1265 }
1266 }
1267 }
1268
1269 return new_rate;
1270 }
1271
1272 /*
1273 * Set up search table for MIMO2
1274 */
1275 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1276 struct iwl_lq_sta *lq_sta,
1277 struct ieee80211_conf *conf,
1278 struct ieee80211_sta *sta,
1279 struct iwl_scale_tbl_info *tbl, int index)
1280 {
1281 u16 rate_mask;
1282 s32 rate;
1283 s8 is_green = lq_sta->is_green;
1284 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1285 struct iwl_rxon_context *ctx = sta_priv->ctx;
1286
1287 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1288 return -1;
1289
1290 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1291 == WLAN_HT_CAP_SM_PS_STATIC)
1292 return -1;
1293
1294 /* Need both Tx chains/antennas to support MIMO */
1295 if (hw_params(priv).tx_chains_num < 2)
1296 return -1;
1297
1298 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1299
1300 tbl->lq_type = LQ_MIMO2;
1301 tbl->is_dup = lq_sta->is_dup;
1302 tbl->action = 0;
1303 tbl->max_search = IWL_MAX_SEARCH;
1304 rate_mask = lq_sta->active_mimo2_rate;
1305
1306 if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1307 tbl->is_ht40 = 1;
1308 else
1309 tbl->is_ht40 = 0;
1310
1311 rs_set_expected_tpt_table(lq_sta, tbl);
1312
1313 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1314
1315 IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1316 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1317 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1318 rate, rate_mask);
1319 return -1;
1320 }
1321 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1322
1323 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1324 tbl->current_rate, is_green);
1325 return 0;
1326 }
1327
1328 /*
1329 * Set up search table for MIMO3
1330 */
1331 static int rs_switch_to_mimo3(struct iwl_priv *priv,
1332 struct iwl_lq_sta *lq_sta,
1333 struct ieee80211_conf *conf,
1334 struct ieee80211_sta *sta,
1335 struct iwl_scale_tbl_info *tbl, int index)
1336 {
1337 u16 rate_mask;
1338 s32 rate;
1339 s8 is_green = lq_sta->is_green;
1340 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1341 struct iwl_rxon_context *ctx = sta_priv->ctx;
1342
1343 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1344 return -1;
1345
1346 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1347 == WLAN_HT_CAP_SM_PS_STATIC)
1348 return -1;
1349
1350 /* Need both Tx chains/antennas to support MIMO */
1351 if (hw_params(priv).tx_chains_num < 3)
1352 return -1;
1353
1354 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1355
1356 tbl->lq_type = LQ_MIMO3;
1357 tbl->is_dup = lq_sta->is_dup;
1358 tbl->action = 0;
1359 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1360 rate_mask = lq_sta->active_mimo3_rate;
1361
1362 if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1363 tbl->is_ht40 = 1;
1364 else
1365 tbl->is_ht40 = 0;
1366
1367 rs_set_expected_tpt_table(lq_sta, tbl);
1368
1369 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1370
1371 IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1372 rate, rate_mask);
1373 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1374 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1375 rate, rate_mask);
1376 return -1;
1377 }
1378 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1379
1380 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1381 tbl->current_rate, is_green);
1382 return 0;
1383 }
1384
1385 /*
1386 * Set up search table for SISO
1387 */
1388 static int rs_switch_to_siso(struct iwl_priv *priv,
1389 struct iwl_lq_sta *lq_sta,
1390 struct ieee80211_conf *conf,
1391 struct ieee80211_sta *sta,
1392 struct iwl_scale_tbl_info *tbl, int index)
1393 {
1394 u16 rate_mask;
1395 u8 is_green = lq_sta->is_green;
1396 s32 rate;
1397 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1398 struct iwl_rxon_context *ctx = sta_priv->ctx;
1399
1400 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1401 return -1;
1402
1403 IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1404
1405 tbl->is_dup = lq_sta->is_dup;
1406 tbl->lq_type = LQ_SISO;
1407 tbl->action = 0;
1408 tbl->max_search = IWL_MAX_SEARCH;
1409 rate_mask = lq_sta->active_siso_rate;
1410
1411 if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1412 tbl->is_ht40 = 1;
1413 else
1414 tbl->is_ht40 = 0;
1415
1416 if (is_green)
1417 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1418
1419 rs_set_expected_tpt_table(lq_sta, tbl);
1420 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1421
1422 IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1423 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1424 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1425 rate, rate_mask);
1426 return -1;
1427 }
1428 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1429 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1430 tbl->current_rate, is_green);
1431 return 0;
1432 }
1433
1434 /*
1435 * Try to switch to new modulation mode from legacy
1436 */
1437 static int rs_move_legacy_other(struct iwl_priv *priv,
1438 struct iwl_lq_sta *lq_sta,
1439 struct ieee80211_conf *conf,
1440 struct ieee80211_sta *sta,
1441 int index)
1442 {
1443 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1444 struct iwl_scale_tbl_info *search_tbl =
1445 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1446 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1447 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1448 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1449 u8 start_action;
1450 u8 valid_tx_ant = hw_params(priv).valid_tx_ant;
1451 u8 tx_chains_num = hw_params(priv).tx_chains_num;
1452 int ret = 0;
1453 u8 update_search_tbl_counter = 0;
1454
1455 switch (priv->bt_traffic_load) {
1456 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1457 /* nothing */
1458 break;
1459 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1460 /* avoid antenna B unless MIMO */
1461 if (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2)
1462 tbl->action = IWL_LEGACY_SWITCH_SISO;
1463 break;
1464 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1465 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1466 /* avoid antenna B and MIMO */
1467 valid_tx_ant =
1468 first_antenna(hw_params(priv).valid_tx_ant);
1469 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2 &&
1470 tbl->action != IWL_LEGACY_SWITCH_SISO)
1471 tbl->action = IWL_LEGACY_SWITCH_SISO;
1472 break;
1473 default:
1474 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1475 break;
1476 }
1477
1478 if (!iwl_ht_enabled(priv))
1479 /* stay in Legacy */
1480 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1481 else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1482 tbl->action > IWL_LEGACY_SWITCH_SISO)
1483 tbl->action = IWL_LEGACY_SWITCH_SISO;
1484
1485 /* configure as 1x1 if bt full concurrency */
1486 if (priv->bt_full_concurrent) {
1487 if (!iwl_ht_enabled(priv))
1488 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1489 else if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1490 tbl->action = IWL_LEGACY_SWITCH_SISO;
1491 valid_tx_ant =
1492 first_antenna(hw_params(priv).valid_tx_ant);
1493 }
1494
1495 start_action = tbl->action;
1496 for (; ;) {
1497 lq_sta->action_counter++;
1498 switch (tbl->action) {
1499 case IWL_LEGACY_SWITCH_ANTENNA1:
1500 case IWL_LEGACY_SWITCH_ANTENNA2:
1501 IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1502
1503 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1504 tx_chains_num <= 1) ||
1505 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1506 tx_chains_num <= 2))
1507 break;
1508
1509 /* Don't change antenna if success has been great */
1510 if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1511 !priv->bt_full_concurrent &&
1512 priv->bt_traffic_load ==
1513 IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1514 break;
1515
1516 /* Set up search table to try other antenna */
1517 memcpy(search_tbl, tbl, sz);
1518
1519 if (rs_toggle_antenna(valid_tx_ant,
1520 &search_tbl->current_rate, search_tbl)) {
1521 update_search_tbl_counter = 1;
1522 rs_set_expected_tpt_table(lq_sta, search_tbl);
1523 goto out;
1524 }
1525 break;
1526 case IWL_LEGACY_SWITCH_SISO:
1527 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1528
1529 /* Set up search table to try SISO */
1530 memcpy(search_tbl, tbl, sz);
1531 search_tbl->is_SGI = 0;
1532 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1533 search_tbl, index);
1534 if (!ret) {
1535 lq_sta->action_counter = 0;
1536 goto out;
1537 }
1538
1539 break;
1540 case IWL_LEGACY_SWITCH_MIMO2_AB:
1541 case IWL_LEGACY_SWITCH_MIMO2_AC:
1542 case IWL_LEGACY_SWITCH_MIMO2_BC:
1543 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1544
1545 /* Set up search table to try MIMO */
1546 memcpy(search_tbl, tbl, sz);
1547 search_tbl->is_SGI = 0;
1548
1549 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1550 search_tbl->ant_type = ANT_AB;
1551 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1552 search_tbl->ant_type = ANT_AC;
1553 else
1554 search_tbl->ant_type = ANT_BC;
1555
1556 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1557 break;
1558
1559 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1560 search_tbl, index);
1561 if (!ret) {
1562 lq_sta->action_counter = 0;
1563 goto out;
1564 }
1565 break;
1566
1567 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1568 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1569
1570 /* Set up search table to try MIMO3 */
1571 memcpy(search_tbl, tbl, sz);
1572 search_tbl->is_SGI = 0;
1573
1574 search_tbl->ant_type = ANT_ABC;
1575
1576 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1577 break;
1578
1579 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1580 search_tbl, index);
1581 if (!ret) {
1582 lq_sta->action_counter = 0;
1583 goto out;
1584 }
1585 break;
1586 }
1587 tbl->action++;
1588 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1589 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1590
1591 if (tbl->action == start_action)
1592 break;
1593
1594 }
1595 search_tbl->lq_type = LQ_NONE;
1596 return 0;
1597
1598 out:
1599 lq_sta->search_better_tbl = 1;
1600 tbl->action++;
1601 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1602 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1603 if (update_search_tbl_counter)
1604 search_tbl->action = tbl->action;
1605 return 0;
1606
1607 }
1608
1609 /*
1610 * Try to switch to new modulation mode from SISO
1611 */
1612 static int rs_move_siso_to_other(struct iwl_priv *priv,
1613 struct iwl_lq_sta *lq_sta,
1614 struct ieee80211_conf *conf,
1615 struct ieee80211_sta *sta, int index)
1616 {
1617 u8 is_green = lq_sta->is_green;
1618 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1619 struct iwl_scale_tbl_info *search_tbl =
1620 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1621 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1622 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1623 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1624 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1625 u8 start_action;
1626 u8 valid_tx_ant = hw_params(priv).valid_tx_ant;
1627 u8 tx_chains_num = hw_params(priv).tx_chains_num;
1628 u8 update_search_tbl_counter = 0;
1629 int ret;
1630
1631 switch (priv->bt_traffic_load) {
1632 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1633 /* nothing */
1634 break;
1635 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1636 /* avoid antenna B unless MIMO */
1637 if (tbl->action == IWL_SISO_SWITCH_ANTENNA2)
1638 tbl->action = IWL_SISO_SWITCH_MIMO2_AB;
1639 break;
1640 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1641 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1642 /* avoid antenna B and MIMO */
1643 valid_tx_ant =
1644 first_antenna(hw_params(priv).valid_tx_ant);
1645 if (tbl->action != IWL_SISO_SWITCH_ANTENNA1)
1646 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1647 break;
1648 default:
1649 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1650 break;
1651 }
1652
1653 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1654 tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1655 /* stay in SISO */
1656 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1657 }
1658
1659 /* configure as 1x1 if bt full concurrency */
1660 if (priv->bt_full_concurrent) {
1661 valid_tx_ant =
1662 first_antenna(hw_params(priv).valid_tx_ant);
1663 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1664 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1665 }
1666
1667 start_action = tbl->action;
1668 for (;;) {
1669 lq_sta->action_counter++;
1670 switch (tbl->action) {
1671 case IWL_SISO_SWITCH_ANTENNA1:
1672 case IWL_SISO_SWITCH_ANTENNA2:
1673 IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1674 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1675 tx_chains_num <= 1) ||
1676 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1677 tx_chains_num <= 2))
1678 break;
1679
1680 if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1681 !priv->bt_full_concurrent &&
1682 priv->bt_traffic_load ==
1683 IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1684 break;
1685
1686 memcpy(search_tbl, tbl, sz);
1687 if (rs_toggle_antenna(valid_tx_ant,
1688 &search_tbl->current_rate, search_tbl)) {
1689 update_search_tbl_counter = 1;
1690 goto out;
1691 }
1692 break;
1693 case IWL_SISO_SWITCH_MIMO2_AB:
1694 case IWL_SISO_SWITCH_MIMO2_AC:
1695 case IWL_SISO_SWITCH_MIMO2_BC:
1696 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1697 memcpy(search_tbl, tbl, sz);
1698 search_tbl->is_SGI = 0;
1699
1700 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1701 search_tbl->ant_type = ANT_AB;
1702 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1703 search_tbl->ant_type = ANT_AC;
1704 else
1705 search_tbl->ant_type = ANT_BC;
1706
1707 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1708 break;
1709
1710 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1711 search_tbl, index);
1712 if (!ret)
1713 goto out;
1714 break;
1715 case IWL_SISO_SWITCH_GI:
1716 if (!tbl->is_ht40 && !(ht_cap->cap &
1717 IEEE80211_HT_CAP_SGI_20))
1718 break;
1719 if (tbl->is_ht40 && !(ht_cap->cap &
1720 IEEE80211_HT_CAP_SGI_40))
1721 break;
1722
1723 IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1724
1725 memcpy(search_tbl, tbl, sz);
1726 if (is_green) {
1727 if (!tbl->is_SGI)
1728 break;
1729 else
1730 IWL_ERR(priv,
1731 "SGI was set in GF+SISO\n");
1732 }
1733 search_tbl->is_SGI = !tbl->is_SGI;
1734 rs_set_expected_tpt_table(lq_sta, search_tbl);
1735 if (tbl->is_SGI) {
1736 s32 tpt = lq_sta->last_tpt / 100;
1737 if (tpt >= search_tbl->expected_tpt[index])
1738 break;
1739 }
1740 search_tbl->current_rate =
1741 rate_n_flags_from_tbl(priv, search_tbl,
1742 index, is_green);
1743 update_search_tbl_counter = 1;
1744 goto out;
1745 case IWL_SISO_SWITCH_MIMO3_ABC:
1746 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1747 memcpy(search_tbl, tbl, sz);
1748 search_tbl->is_SGI = 0;
1749 search_tbl->ant_type = ANT_ABC;
1750
1751 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1752 break;
1753
1754 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1755 search_tbl, index);
1756 if (!ret)
1757 goto out;
1758 break;
1759 }
1760 tbl->action++;
1761 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1762 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1763
1764 if (tbl->action == start_action)
1765 break;
1766 }
1767 search_tbl->lq_type = LQ_NONE;
1768 return 0;
1769
1770 out:
1771 lq_sta->search_better_tbl = 1;
1772 tbl->action++;
1773 if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1774 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1775 if (update_search_tbl_counter)
1776 search_tbl->action = tbl->action;
1777
1778 return 0;
1779 }
1780
1781 /*
1782 * Try to switch to new modulation mode from MIMO2
1783 */
1784 static int rs_move_mimo2_to_other(struct iwl_priv *priv,
1785 struct iwl_lq_sta *lq_sta,
1786 struct ieee80211_conf *conf,
1787 struct ieee80211_sta *sta, int index)
1788 {
1789 s8 is_green = lq_sta->is_green;
1790 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1791 struct iwl_scale_tbl_info *search_tbl =
1792 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1793 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1794 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1795 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1796 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1797 u8 start_action;
1798 u8 valid_tx_ant = hw_params(priv).valid_tx_ant;
1799 u8 tx_chains_num = hw_params(priv).tx_chains_num;
1800 u8 update_search_tbl_counter = 0;
1801 int ret;
1802
1803 switch (priv->bt_traffic_load) {
1804 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1805 /* nothing */
1806 break;
1807 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1808 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1809 /* avoid antenna B and MIMO */
1810 if (tbl->action != IWL_MIMO2_SWITCH_SISO_A)
1811 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1812 break;
1813 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1814 /* avoid antenna B unless MIMO */
1815 if (tbl->action == IWL_MIMO2_SWITCH_SISO_B ||
1816 tbl->action == IWL_MIMO2_SWITCH_SISO_C)
1817 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1818 break;
1819 default:
1820 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1821 break;
1822 }
1823
1824 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1825 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1826 tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1827 /* switch in SISO */
1828 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1829 }
1830
1831 /* configure as 1x1 if bt full concurrency */
1832 if (priv->bt_full_concurrent &&
1833 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1834 tbl->action > IWL_MIMO2_SWITCH_SISO_C))
1835 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1836
1837 start_action = tbl->action;
1838 for (;;) {
1839 lq_sta->action_counter++;
1840 switch (tbl->action) {
1841 case IWL_MIMO2_SWITCH_ANTENNA1:
1842 case IWL_MIMO2_SWITCH_ANTENNA2:
1843 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1844
1845 if (tx_chains_num <= 2)
1846 break;
1847
1848 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1849 break;
1850
1851 memcpy(search_tbl, tbl, sz);
1852 if (rs_toggle_antenna(valid_tx_ant,
1853 &search_tbl->current_rate, search_tbl)) {
1854 update_search_tbl_counter = 1;
1855 goto out;
1856 }
1857 break;
1858 case IWL_MIMO2_SWITCH_SISO_A:
1859 case IWL_MIMO2_SWITCH_SISO_B:
1860 case IWL_MIMO2_SWITCH_SISO_C:
1861 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1862
1863 /* Set up new search table for SISO */
1864 memcpy(search_tbl, tbl, sz);
1865
1866 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1867 search_tbl->ant_type = ANT_A;
1868 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1869 search_tbl->ant_type = ANT_B;
1870 else
1871 search_tbl->ant_type = ANT_C;
1872
1873 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1874 break;
1875
1876 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1877 search_tbl, index);
1878 if (!ret)
1879 goto out;
1880
1881 break;
1882
1883 case IWL_MIMO2_SWITCH_GI:
1884 if (!tbl->is_ht40 && !(ht_cap->cap &
1885 IEEE80211_HT_CAP_SGI_20))
1886 break;
1887 if (tbl->is_ht40 && !(ht_cap->cap &
1888 IEEE80211_HT_CAP_SGI_40))
1889 break;
1890
1891 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1892
1893 /* Set up new search table for MIMO2 */
1894 memcpy(search_tbl, tbl, sz);
1895 search_tbl->is_SGI = !tbl->is_SGI;
1896 rs_set_expected_tpt_table(lq_sta, search_tbl);
1897 /*
1898 * If active table already uses the fastest possible
1899 * modulation (dual stream with short guard interval),
1900 * and it's working well, there's no need to look
1901 * for a better type of modulation!
1902 */
1903 if (tbl->is_SGI) {
1904 s32 tpt = lq_sta->last_tpt / 100;
1905 if (tpt >= search_tbl->expected_tpt[index])
1906 break;
1907 }
1908 search_tbl->current_rate =
1909 rate_n_flags_from_tbl(priv, search_tbl,
1910 index, is_green);
1911 update_search_tbl_counter = 1;
1912 goto out;
1913
1914 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1915 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1916 memcpy(search_tbl, tbl, sz);
1917 search_tbl->is_SGI = 0;
1918 search_tbl->ant_type = ANT_ABC;
1919
1920 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1921 break;
1922
1923 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1924 search_tbl, index);
1925 if (!ret)
1926 goto out;
1927
1928 break;
1929 }
1930 tbl->action++;
1931 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1932 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1933
1934 if (tbl->action == start_action)
1935 break;
1936 }
1937 search_tbl->lq_type = LQ_NONE;
1938 return 0;
1939 out:
1940 lq_sta->search_better_tbl = 1;
1941 tbl->action++;
1942 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1943 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1944 if (update_search_tbl_counter)
1945 search_tbl->action = tbl->action;
1946
1947 return 0;
1948
1949 }
1950
1951 /*
1952 * Try to switch to new modulation mode from MIMO3
1953 */
1954 static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1955 struct iwl_lq_sta *lq_sta,
1956 struct ieee80211_conf *conf,
1957 struct ieee80211_sta *sta, int index)
1958 {
1959 s8 is_green = lq_sta->is_green;
1960 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1961 struct iwl_scale_tbl_info *search_tbl =
1962 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1963 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1964 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1965 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1966 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1967 u8 start_action;
1968 u8 valid_tx_ant = hw_params(priv).valid_tx_ant;
1969 u8 tx_chains_num = hw_params(priv).tx_chains_num;
1970 int ret;
1971 u8 update_search_tbl_counter = 0;
1972
1973 switch (priv->bt_traffic_load) {
1974 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1975 /* nothing */
1976 break;
1977 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1978 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1979 /* avoid antenna B and MIMO */
1980 if (tbl->action != IWL_MIMO3_SWITCH_SISO_A)
1981 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1982 break;
1983 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1984 /* avoid antenna B unless MIMO */
1985 if (tbl->action == IWL_MIMO3_SWITCH_SISO_B ||
1986 tbl->action == IWL_MIMO3_SWITCH_SISO_C)
1987 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1988 break;
1989 default:
1990 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1991 break;
1992 }
1993
1994 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1995 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1996 tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1997 /* switch in SISO */
1998 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1999 }
2000
2001 /* configure as 1x1 if bt full concurrency */
2002 if (priv->bt_full_concurrent &&
2003 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
2004 tbl->action > IWL_MIMO3_SWITCH_SISO_C))
2005 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
2006
2007 start_action = tbl->action;
2008 for (;;) {
2009 lq_sta->action_counter++;
2010 switch (tbl->action) {
2011 case IWL_MIMO3_SWITCH_ANTENNA1:
2012 case IWL_MIMO3_SWITCH_ANTENNA2:
2013 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
2014
2015 if (tx_chains_num <= 3)
2016 break;
2017
2018 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
2019 break;
2020
2021 memcpy(search_tbl, tbl, sz);
2022 if (rs_toggle_antenna(valid_tx_ant,
2023 &search_tbl->current_rate, search_tbl))
2024 goto out;
2025 break;
2026 case IWL_MIMO3_SWITCH_SISO_A:
2027 case IWL_MIMO3_SWITCH_SISO_B:
2028 case IWL_MIMO3_SWITCH_SISO_C:
2029 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
2030
2031 /* Set up new search table for SISO */
2032 memcpy(search_tbl, tbl, sz);
2033
2034 if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
2035 search_tbl->ant_type = ANT_A;
2036 else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
2037 search_tbl->ant_type = ANT_B;
2038 else
2039 search_tbl->ant_type = ANT_C;
2040
2041 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2042 break;
2043
2044 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
2045 search_tbl, index);
2046 if (!ret)
2047 goto out;
2048
2049 break;
2050
2051 case IWL_MIMO3_SWITCH_MIMO2_AB:
2052 case IWL_MIMO3_SWITCH_MIMO2_AC:
2053 case IWL_MIMO3_SWITCH_MIMO2_BC:
2054 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
2055
2056 memcpy(search_tbl, tbl, sz);
2057 search_tbl->is_SGI = 0;
2058 if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
2059 search_tbl->ant_type = ANT_AB;
2060 else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
2061 search_tbl->ant_type = ANT_AC;
2062 else
2063 search_tbl->ant_type = ANT_BC;
2064
2065 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2066 break;
2067
2068 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
2069 search_tbl, index);
2070 if (!ret)
2071 goto out;
2072
2073 break;
2074
2075 case IWL_MIMO3_SWITCH_GI:
2076 if (!tbl->is_ht40 && !(ht_cap->cap &
2077 IEEE80211_HT_CAP_SGI_20))
2078 break;
2079 if (tbl->is_ht40 && !(ht_cap->cap &
2080 IEEE80211_HT_CAP_SGI_40))
2081 break;
2082
2083 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
2084
2085 /* Set up new search table for MIMO */
2086 memcpy(search_tbl, tbl, sz);
2087 search_tbl->is_SGI = !tbl->is_SGI;
2088 rs_set_expected_tpt_table(lq_sta, search_tbl);
2089 /*
2090 * If active table already uses the fastest possible
2091 * modulation (dual stream with short guard interval),
2092 * and it's working well, there's no need to look
2093 * for a better type of modulation!
2094 */
2095 if (tbl->is_SGI) {
2096 s32 tpt = lq_sta->last_tpt / 100;
2097 if (tpt >= search_tbl->expected_tpt[index])
2098 break;
2099 }
2100 search_tbl->current_rate =
2101 rate_n_flags_from_tbl(priv, search_tbl,
2102 index, is_green);
2103 update_search_tbl_counter = 1;
2104 goto out;
2105 }
2106 tbl->action++;
2107 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2108 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2109
2110 if (tbl->action == start_action)
2111 break;
2112 }
2113 search_tbl->lq_type = LQ_NONE;
2114 return 0;
2115 out:
2116 lq_sta->search_better_tbl = 1;
2117 tbl->action++;
2118 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2119 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2120 if (update_search_tbl_counter)
2121 search_tbl->action = tbl->action;
2122
2123 return 0;
2124
2125 }
2126
2127 /*
2128 * Check whether we should continue using same modulation mode, or
2129 * begin search for a new mode, based on:
2130 * 1) # tx successes or failures while using this mode
2131 * 2) # times calling this function
2132 * 3) elapsed time in this mode (not used, for now)
2133 */
2134 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
2135 {
2136 struct iwl_scale_tbl_info *tbl;
2137 int i;
2138 int active_tbl;
2139 int flush_interval_passed = 0;
2140 struct iwl_priv *priv;
2141
2142 priv = lq_sta->drv;
2143 active_tbl = lq_sta->active_tbl;
2144
2145 tbl = &(lq_sta->lq_info[active_tbl]);
2146
2147 /* If we've been disallowing search, see if we should now allow it */
2148 if (lq_sta->stay_in_tbl) {
2149
2150 /* Elapsed time using current modulation mode */
2151 if (lq_sta->flush_timer)
2152 flush_interval_passed =
2153 time_after(jiffies,
2154 (unsigned long)(lq_sta->flush_timer +
2155 IWL_RATE_SCALE_FLUSH_INTVL));
2156
2157 /*
2158 * Check if we should allow search for new modulation mode.
2159 * If many frames have failed or succeeded, or we've used
2160 * this same modulation for a long time, allow search, and
2161 * reset history stats that keep track of whether we should
2162 * allow a new search. Also (below) reset all bitmaps and
2163 * stats in active history.
2164 */
2165 if (force_search ||
2166 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
2167 (lq_sta->total_success > lq_sta->max_success_limit) ||
2168 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
2169 && (flush_interval_passed))) {
2170 IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n:",
2171 lq_sta->total_failed,
2172 lq_sta->total_success,
2173 flush_interval_passed);
2174
2175 /* Allow search for new mode */
2176 lq_sta->stay_in_tbl = 0; /* only place reset */
2177 lq_sta->total_failed = 0;
2178 lq_sta->total_success = 0;
2179 lq_sta->flush_timer = 0;
2180
2181 /*
2182 * Else if we've used this modulation mode enough repetitions
2183 * (regardless of elapsed time or success/failure), reset
2184 * history bitmaps and rate-specific stats for all rates in
2185 * active table.
2186 */
2187 } else {
2188 lq_sta->table_count++;
2189 if (lq_sta->table_count >=
2190 lq_sta->table_count_limit) {
2191 lq_sta->table_count = 0;
2192
2193 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
2194 for (i = 0; i < IWL_RATE_COUNT; i++)
2195 rs_rate_scale_clear_window(
2196 &(tbl->win[i]));
2197 }
2198 }
2199
2200 /* If transitioning to allow "search", reset all history
2201 * bitmaps and stats in active table (this will become the new
2202 * "search" table). */
2203 if (!lq_sta->stay_in_tbl) {
2204 for (i = 0; i < IWL_RATE_COUNT; i++)
2205 rs_rate_scale_clear_window(&(tbl->win[i]));
2206 }
2207 }
2208 }
2209
2210 /*
2211 * setup rate table in uCode
2212 */
2213 static void rs_update_rate_tbl(struct iwl_priv *priv,
2214 struct iwl_rxon_context *ctx,
2215 struct iwl_lq_sta *lq_sta,
2216 struct iwl_scale_tbl_info *tbl,
2217 int index, u8 is_green)
2218 {
2219 u32 rate;
2220
2221 /* Update uCode's rate table. */
2222 rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2223 rs_fill_link_cmd(priv, lq_sta, rate);
2224 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2225 }
2226
2227 /*
2228 * Do rate scaling and search for new modulation mode.
2229 */
2230 static void rs_rate_scale_perform(struct iwl_priv *priv,
2231 struct sk_buff *skb,
2232 struct ieee80211_sta *sta,
2233 struct iwl_lq_sta *lq_sta)
2234 {
2235 struct ieee80211_hw *hw = priv->hw;
2236 struct ieee80211_conf *conf = &hw->conf;
2237 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2238 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2239 int low = IWL_RATE_INVALID;
2240 int high = IWL_RATE_INVALID;
2241 int index;
2242 int i;
2243 struct iwl_rate_scale_data *window = NULL;
2244 int current_tpt = IWL_INVALID_VALUE;
2245 int low_tpt = IWL_INVALID_VALUE;
2246 int high_tpt = IWL_INVALID_VALUE;
2247 u32 fail_count;
2248 s8 scale_action = 0;
2249 u16 rate_mask;
2250 u8 update_lq = 0;
2251 struct iwl_scale_tbl_info *tbl, *tbl1;
2252 u16 rate_scale_index_msk = 0;
2253 u8 is_green = 0;
2254 u8 active_tbl = 0;
2255 u8 done_search = 0;
2256 u16 high_low;
2257 s32 sr;
2258 u8 tid = IWL_MAX_TID_COUNT;
2259 struct iwl_tid_data *tid_data;
2260 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
2261 struct iwl_rxon_context *ctx = sta_priv->ctx;
2262
2263 IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
2264
2265 /* Send management frames and NO_ACK data using lowest rate. */
2266 /* TODO: this could probably be improved.. */
2267 if (!ieee80211_is_data(hdr->frame_control) ||
2268 info->flags & IEEE80211_TX_CTL_NO_ACK)
2269 return;
2270
2271 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
2272
2273 tid = rs_tl_add_packet(lq_sta, hdr);
2274 if ((tid != IWL_MAX_TID_COUNT) &&
2275 (lq_sta->tx_agg_tid_en & (1 << tid))) {
2276 tid_data = &priv->tid_data[lq_sta->lq.sta_id][tid];
2277 if (tid_data->agg.state == IWL_AGG_OFF)
2278 lq_sta->is_agg = 0;
2279 else
2280 lq_sta->is_agg = 1;
2281 } else
2282 lq_sta->is_agg = 0;
2283
2284 /*
2285 * Select rate-scale / modulation-mode table to work with in
2286 * the rest of this function: "search" if searching for better
2287 * modulation mode, or "active" if doing rate scaling within a mode.
2288 */
2289 if (!lq_sta->search_better_tbl)
2290 active_tbl = lq_sta->active_tbl;
2291 else
2292 active_tbl = 1 - lq_sta->active_tbl;
2293
2294 tbl = &(lq_sta->lq_info[active_tbl]);
2295 if (is_legacy(tbl->lq_type))
2296 lq_sta->is_green = 0;
2297 else
2298 lq_sta->is_green = rs_use_green(sta);
2299 is_green = lq_sta->is_green;
2300
2301 /* current tx rate */
2302 index = lq_sta->last_txrate_idx;
2303
2304 IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2305 tbl->lq_type);
2306
2307 /* rates available for this association, and for modulation mode */
2308 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2309
2310 IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
2311
2312 /* mask with station rate restriction */
2313 if (is_legacy(tbl->lq_type)) {
2314 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2315 /* supp_rates has no CCK bits in A mode */
2316 rate_scale_index_msk = (u16) (rate_mask &
2317 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2318 else
2319 rate_scale_index_msk = (u16) (rate_mask &
2320 lq_sta->supp_rates);
2321
2322 } else
2323 rate_scale_index_msk = rate_mask;
2324
2325 if (!rate_scale_index_msk)
2326 rate_scale_index_msk = rate_mask;
2327
2328 if (!((1 << index) & rate_scale_index_msk)) {
2329 IWL_ERR(priv, "Current Rate is not valid\n");
2330 if (lq_sta->search_better_tbl) {
2331 /* revert to active table if search table is not valid*/
2332 tbl->lq_type = LQ_NONE;
2333 lq_sta->search_better_tbl = 0;
2334 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2335 /* get "active" rate info */
2336 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2337 rs_update_rate_tbl(priv, ctx, lq_sta, tbl,
2338 index, is_green);
2339 }
2340 return;
2341 }
2342
2343 /* Get expected throughput table and history window for current rate */
2344 if (!tbl->expected_tpt) {
2345 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2346 return;
2347 }
2348
2349 /* force user max rate if set by user */
2350 if ((lq_sta->max_rate_idx != -1) &&
2351 (lq_sta->max_rate_idx < index)) {
2352 index = lq_sta->max_rate_idx;
2353 update_lq = 1;
2354 window = &(tbl->win[index]);
2355 goto lq_update;
2356 }
2357
2358 window = &(tbl->win[index]);
2359
2360 /*
2361 * If there is not enough history to calculate actual average
2362 * throughput, keep analyzing results of more tx frames, without
2363 * changing rate or mode (bypass most of the rest of this function).
2364 * Set up new rate table in uCode only if old rate is not supported
2365 * in current association (use new rate found above).
2366 */
2367 fail_count = window->counter - window->success_counter;
2368 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2369 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2370 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2371 "for index %d\n",
2372 window->success_counter, window->counter, index);
2373
2374 /* Can't calculate this yet; not enough history */
2375 window->average_tpt = IWL_INVALID_VALUE;
2376
2377 /* Should we stay with this modulation mode,
2378 * or search for a new one? */
2379 rs_stay_in_table(lq_sta, false);
2380
2381 goto out;
2382 }
2383 /* Else we have enough samples; calculate estimate of
2384 * actual average throughput */
2385 if (window->average_tpt != ((window->success_ratio *
2386 tbl->expected_tpt[index] + 64) / 128)) {
2387 IWL_ERR(priv, "expected_tpt should have been calculated by now\n");
2388 window->average_tpt = ((window->success_ratio *
2389 tbl->expected_tpt[index] + 64) / 128);
2390 }
2391
2392 /* If we are searching for better modulation mode, check success. */
2393 if (lq_sta->search_better_tbl &&
2394 (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
2395 /* If good success, continue using the "search" mode;
2396 * no need to send new link quality command, since we're
2397 * continuing to use the setup that we've been trying. */
2398 if (window->average_tpt > lq_sta->last_tpt) {
2399
2400 IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2401 "suc=%d cur-tpt=%d old-tpt=%d\n",
2402 window->success_ratio,
2403 window->average_tpt,
2404 lq_sta->last_tpt);
2405
2406 if (!is_legacy(tbl->lq_type))
2407 lq_sta->enable_counter = 1;
2408
2409 /* Swap tables; "search" becomes "active" */
2410 lq_sta->active_tbl = active_tbl;
2411 current_tpt = window->average_tpt;
2412
2413 /* Else poor success; go back to mode in "active" table */
2414 } else {
2415
2416 IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2417 "suc=%d cur-tpt=%d old-tpt=%d\n",
2418 window->success_ratio,
2419 window->average_tpt,
2420 lq_sta->last_tpt);
2421
2422 /* Nullify "search" table */
2423 tbl->lq_type = LQ_NONE;
2424
2425 /* Revert to "active" table */
2426 active_tbl = lq_sta->active_tbl;
2427 tbl = &(lq_sta->lq_info[active_tbl]);
2428
2429 /* Revert to "active" rate and throughput info */
2430 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2431 current_tpt = lq_sta->last_tpt;
2432
2433 /* Need to set up a new rate table in uCode */
2434 update_lq = 1;
2435 }
2436
2437 /* Either way, we've made a decision; modulation mode
2438 * search is done, allow rate adjustment next time. */
2439 lq_sta->search_better_tbl = 0;
2440 done_search = 1; /* Don't switch modes below! */
2441 goto lq_update;
2442 }
2443
2444 /* (Else) not in search of better modulation mode, try for better
2445 * starting rate, while staying in this mode. */
2446 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2447 tbl->lq_type);
2448 low = high_low & 0xff;
2449 high = (high_low >> 8) & 0xff;
2450
2451 /* If user set max rate, dont allow higher than user constrain */
2452 if ((lq_sta->max_rate_idx != -1) &&
2453 (lq_sta->max_rate_idx < high))
2454 high = IWL_RATE_INVALID;
2455
2456 sr = window->success_ratio;
2457
2458 /* Collect measured throughputs for current and adjacent rates */
2459 current_tpt = window->average_tpt;
2460 if (low != IWL_RATE_INVALID)
2461 low_tpt = tbl->win[low].average_tpt;
2462 if (high != IWL_RATE_INVALID)
2463 high_tpt = tbl->win[high].average_tpt;
2464
2465 scale_action = 0;
2466
2467 /* Too many failures, decrease rate */
2468 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2469 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2470 scale_action = -1;
2471
2472 /* No throughput measured yet for adjacent rates; try increase. */
2473 } else if ((low_tpt == IWL_INVALID_VALUE) &&
2474 (high_tpt == IWL_INVALID_VALUE)) {
2475
2476 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2477 scale_action = 1;
2478 else if (low != IWL_RATE_INVALID)
2479 scale_action = 0;
2480 }
2481
2482 /* Both adjacent throughputs are measured, but neither one has better
2483 * throughput; we're using the best rate, don't change it! */
2484 else if ((low_tpt != IWL_INVALID_VALUE) &&
2485 (high_tpt != IWL_INVALID_VALUE) &&
2486 (low_tpt < current_tpt) &&
2487 (high_tpt < current_tpt))
2488 scale_action = 0;
2489
2490 /* At least one adjacent rate's throughput is measured,
2491 * and may have better performance. */
2492 else {
2493 /* Higher adjacent rate's throughput is measured */
2494 if (high_tpt != IWL_INVALID_VALUE) {
2495 /* Higher rate has better throughput */
2496 if (high_tpt > current_tpt &&
2497 sr >= IWL_RATE_INCREASE_TH) {
2498 scale_action = 1;
2499 } else {
2500 scale_action = 0;
2501 }
2502
2503 /* Lower adjacent rate's throughput is measured */
2504 } else if (low_tpt != IWL_INVALID_VALUE) {
2505 /* Lower rate has better throughput */
2506 if (low_tpt > current_tpt) {
2507 IWL_DEBUG_RATE(priv,
2508 "decrease rate because of low tpt\n");
2509 scale_action = -1;
2510 } else if (sr >= IWL_RATE_INCREASE_TH) {
2511 scale_action = 1;
2512 }
2513 }
2514 }
2515
2516 /* Sanity check; asked for decrease, but success rate or throughput
2517 * has been good at old rate. Don't change it. */
2518 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2519 ((sr > IWL_RATE_HIGH_TH) ||
2520 (current_tpt > (100 * tbl->expected_tpt[low]))))
2521 scale_action = 0;
2522 if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2523 scale_action = -1;
2524 if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
2525 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2526 scale_action = -1;
2527
2528 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2529 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2530 if (lq_sta->last_bt_traffic > priv->bt_traffic_load) {
2531 /*
2532 * don't set scale_action, don't want to scale up if
2533 * the rate scale doesn't otherwise think that is a
2534 * good idea.
2535 */
2536 } else if (lq_sta->last_bt_traffic <= priv->bt_traffic_load) {
2537 scale_action = -1;
2538 }
2539 }
2540 lq_sta->last_bt_traffic = priv->bt_traffic_load;
2541
2542 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2543 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2544 /* search for a new modulation */
2545 rs_stay_in_table(lq_sta, true);
2546 goto lq_update;
2547 }
2548
2549 switch (scale_action) {
2550 case -1:
2551 /* Decrease starting rate, update uCode's rate table */
2552 if (low != IWL_RATE_INVALID) {
2553 update_lq = 1;
2554 index = low;
2555 }
2556
2557 break;
2558 case 1:
2559 /* Increase starting rate, update uCode's rate table */
2560 if (high != IWL_RATE_INVALID) {
2561 update_lq = 1;
2562 index = high;
2563 }
2564
2565 break;
2566 case 0:
2567 /* No change */
2568 default:
2569 break;
2570 }
2571
2572 IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2573 "high %d type %d\n",
2574 index, scale_action, low, high, tbl->lq_type);
2575
2576 lq_update:
2577 /* Replace uCode's rate table for the destination station. */
2578 if (update_lq)
2579 rs_update_rate_tbl(priv, ctx, lq_sta, tbl, index, is_green);
2580
2581 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
2582 /* Should we stay with this modulation mode,
2583 * or search for a new one? */
2584 rs_stay_in_table(lq_sta, false);
2585 }
2586 /*
2587 * Search for new modulation mode if we're:
2588 * 1) Not changing rates right now
2589 * 2) Not just finishing up a search
2590 * 3) Allowing a new search
2591 */
2592 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2593 /* Save current throughput to compare with "search" throughput*/
2594 lq_sta->last_tpt = current_tpt;
2595
2596 /* Select a new "search" modulation mode to try.
2597 * If one is found, set up the new "search" table. */
2598 if (is_legacy(tbl->lq_type))
2599 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2600 else if (is_siso(tbl->lq_type))
2601 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2602 else if (is_mimo2(tbl->lq_type))
2603 rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2604 else
2605 rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2606
2607 /* If new "search" mode was selected, set up in uCode table */
2608 if (lq_sta->search_better_tbl) {
2609 /* Access the "search" table, clear its history. */
2610 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2611 for (i = 0; i < IWL_RATE_COUNT; i++)
2612 rs_rate_scale_clear_window(&(tbl->win[i]));
2613
2614 /* Use new "search" start rate */
2615 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2616
2617 IWL_DEBUG_RATE(priv, "Switch current mcs: %X index: %d\n",
2618 tbl->current_rate, index);
2619 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2620 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2621 } else
2622 done_search = 1;
2623 }
2624
2625 if (done_search && !lq_sta->stay_in_tbl) {
2626 /* If the "active" (non-search) mode was legacy,
2627 * and we've tried switching antennas,
2628 * but we haven't been able to try HT modes (not available),
2629 * stay with best antenna legacy modulation for a while
2630 * before next round of mode comparisons. */
2631 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2632 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2633 lq_sta->action_counter > tbl1->max_search) {
2634 IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2635 rs_set_stay_in_table(priv, 1, lq_sta);
2636 }
2637
2638 /* If we're in an HT mode, and all 3 mode switch actions
2639 * have been tried and compared, stay in this best modulation
2640 * mode for a while before next round of mode comparisons. */
2641 if (lq_sta->enable_counter &&
2642 (lq_sta->action_counter >= tbl1->max_search) &&
2643 iwl_ht_enabled(priv)) {
2644 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2645 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2646 (tid != IWL_MAX_TID_COUNT)) {
2647 u8 sta_id = lq_sta->lq.sta_id;
2648 tid_data = &priv->tid_data[sta_id][tid];
2649 if (tid_data->agg.state == IWL_AGG_OFF) {
2650 IWL_DEBUG_RATE(priv,
2651 "try to aggregate tid %d\n",
2652 tid);
2653 rs_tl_turn_on_agg(priv, tid,
2654 lq_sta, sta);
2655 }
2656 }
2657 rs_set_stay_in_table(priv, 0, lq_sta);
2658 }
2659 }
2660
2661 out:
2662 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2663 lq_sta->last_txrate_idx = index;
2664 }
2665
2666 /**
2667 * rs_initialize_lq - Initialize a station's hardware rate table
2668 *
2669 * The uCode's station table contains a table of fallback rates
2670 * for automatic fallback during transmission.
2671 *
2672 * NOTE: This sets up a default set of values. These will be replaced later
2673 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2674 * rc80211_simple.
2675 *
2676 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2677 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2678 * which requires station table entry to exist).
2679 */
2680 static void rs_initialize_lq(struct iwl_priv *priv,
2681 struct ieee80211_conf *conf,
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 = hw_params(priv).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_priv *priv __maybe_unused = (struct iwl_priv *)priv_r;
2741 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2742 struct iwl_lq_sta *lq_sta = priv_sta;
2743 int rate_idx;
2744
2745 IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2746
2747 /* Get max rate if user set max rate */
2748 if (lq_sta) {
2749 lq_sta->max_rate_idx = txrc->max_rate_idx;
2750 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2751 (lq_sta->max_rate_idx != -1))
2752 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2753 if ((lq_sta->max_rate_idx < 0) ||
2754 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2755 lq_sta->max_rate_idx = -1;
2756 }
2757
2758 /* Treat uninitialized rate scaling data same as non-existing. */
2759 if (lq_sta && !lq_sta->drv) {
2760 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
2761 priv_sta = NULL;
2762 }
2763
2764 /* Send management frames and NO_ACK data using lowest rate. */
2765 if (rate_control_send_low(sta, priv_sta, txrc))
2766 return;
2767
2768 rate_idx = lq_sta->last_txrate_idx;
2769
2770 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2771 rate_idx -= IWL_FIRST_OFDM_RATE;
2772 /* 6M and 9M shared same MCS index */
2773 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2774 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2775 IWL_RATE_MIMO3_6M_PLCP)
2776 rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2777 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2778 IWL_RATE_MIMO2_6M_PLCP)
2779 rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2780 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2781 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2782 info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2783 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2784 info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
2785 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2786 info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2787 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2788 info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2789 } else {
2790 /* Check for invalid rates */
2791 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2792 ((sband->band == IEEE80211_BAND_5GHZ) &&
2793 (rate_idx < IWL_FIRST_OFDM_RATE)))
2794 rate_idx = rate_lowest_index(sband, sta);
2795 /* On valid 5 GHz rate, adjust index */
2796 else if (sband->band == IEEE80211_BAND_5GHZ)
2797 rate_idx -= IWL_FIRST_OFDM_RATE;
2798 info->control.rates[0].flags = 0;
2799 }
2800 info->control.rates[0].idx = rate_idx;
2801
2802 }
2803
2804 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2805 gfp_t gfp)
2806 {
2807 struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2808 struct iwl_priv *priv;
2809
2810 priv = (struct iwl_priv *)priv_rate;
2811 IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2812
2813 return &sta_priv->lq_sta;
2814 }
2815
2816 /*
2817 * Called after adding a new station to initialize rate scaling
2818 */
2819 void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id)
2820 {
2821 int i, j;
2822 struct ieee80211_hw *hw = priv->hw;
2823 struct ieee80211_conf *conf = &priv->hw->conf;
2824 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2825 struct iwl_station_priv *sta_priv;
2826 struct iwl_lq_sta *lq_sta;
2827 struct ieee80211_supported_band *sband;
2828
2829 sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2830 lq_sta = &sta_priv->lq_sta;
2831 sband = hw->wiphy->bands[conf->channel->band];
2832
2833
2834 lq_sta->lq.sta_id = sta_id;
2835
2836 for (j = 0; j < LQ_SIZE; j++)
2837 for (i = 0; i < IWL_RATE_COUNT; i++)
2838 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2839
2840 lq_sta->flush_timer = 0;
2841 lq_sta->supp_rates = sta->supp_rates[sband->band];
2842 for (j = 0; j < LQ_SIZE; j++)
2843 for (i = 0; i < IWL_RATE_COUNT; i++)
2844 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2845
2846 IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n",
2847 sta_id);
2848 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2849 * the lowest or the highest rate.. Could consider using RSSI from
2850 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2851 * after assoc.. */
2852
2853 lq_sta->is_dup = 0;
2854 lq_sta->max_rate_idx = -1;
2855 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2856 lq_sta->is_green = rs_use_green(sta);
2857 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2858 lq_sta->band = priv->band;
2859 /*
2860 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2861 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2862 */
2863 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2864 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2865 lq_sta->active_siso_rate &= ~((u16)0x2);
2866 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2867
2868 /* Same here */
2869 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2870 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2871 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2872 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2873
2874 lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2875 lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2876 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2877 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2878
2879 IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2880 lq_sta->active_siso_rate,
2881 lq_sta->active_mimo2_rate,
2882 lq_sta->active_mimo3_rate);
2883
2884 /* These values will be overridden later */
2885 lq_sta->lq.general_params.single_stream_ant_msk =
2886 first_antenna(hw_params(priv).valid_tx_ant);
2887 lq_sta->lq.general_params.dual_stream_ant_msk =
2888 hw_params(priv).valid_tx_ant &
2889 ~first_antenna(hw_params(priv).valid_tx_ant);
2890 if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2891 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2892 } else if (num_of_ant(hw_params(priv).valid_tx_ant) == 2) {
2893 lq_sta->lq.general_params.dual_stream_ant_msk =
2894 hw_params(priv).valid_tx_ant;
2895 }
2896
2897 /* as default allow aggregation for all tids */
2898 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2899 lq_sta->drv = priv;
2900
2901 /* Set last_txrate_idx to lowest rate */
2902 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2903 if (sband->band == IEEE80211_BAND_5GHZ)
2904 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2905 lq_sta->is_agg = 0;
2906 #ifdef CONFIG_IWLWIFI_DEVICE_TESTMODE
2907 priv->tm_fixed_rate = 0;
2908 #endif
2909 #ifdef CONFIG_MAC80211_DEBUGFS
2910 lq_sta->dbg_fixed_rate = 0;
2911 #endif
2912
2913 rs_initialize_lq(priv, conf, sta, lq_sta);
2914 }
2915
2916 static void rs_fill_link_cmd(struct iwl_priv *priv,
2917 struct iwl_lq_sta *lq_sta, u32 new_rate)
2918 {
2919 struct iwl_scale_tbl_info tbl_type;
2920 int index = 0;
2921 int rate_idx;
2922 int repeat_rate = 0;
2923 u8 ant_toggle_cnt = 0;
2924 u8 use_ht_possible = 1;
2925 u8 valid_tx_ant = 0;
2926 struct iwl_station_priv *sta_priv =
2927 container_of(lq_sta, struct iwl_station_priv, lq_sta);
2928 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2929
2930 /* Override starting rate (index 0) if needed for debug purposes */
2931 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2932
2933 /* Interpret new_rate (rate_n_flags) */
2934 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2935 &tbl_type, &rate_idx);
2936
2937 if (priv && priv->bt_full_concurrent) {
2938 /* 1x1 only */
2939 tbl_type.ant_type =
2940 first_antenna(hw_params(priv).valid_tx_ant);
2941 }
2942
2943 /* How many times should we repeat the initial rate? */
2944 if (is_legacy(tbl_type.lq_type)) {
2945 ant_toggle_cnt = 1;
2946 repeat_rate = IWL_NUMBER_TRY;
2947 } else {
2948 repeat_rate = min(IWL_HT_NUMBER_TRY,
2949 LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2950 }
2951
2952 lq_cmd->general_params.mimo_delimiter =
2953 is_mimo(tbl_type.lq_type) ? 1 : 0;
2954
2955 /* Fill 1st table entry (index 0) */
2956 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2957
2958 if (num_of_ant(tbl_type.ant_type) == 1) {
2959 lq_cmd->general_params.single_stream_ant_msk =
2960 tbl_type.ant_type;
2961 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2962 lq_cmd->general_params.dual_stream_ant_msk =
2963 tbl_type.ant_type;
2964 } /* otherwise we don't modify the existing value */
2965
2966 index++;
2967 repeat_rate--;
2968 if (priv) {
2969 if (priv->bt_full_concurrent)
2970 valid_tx_ant = ANT_A;
2971 else
2972 valid_tx_ant = hw_params(priv).valid_tx_ant;
2973 }
2974
2975 /* Fill rest of rate table */
2976 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2977 /* Repeat initial/next rate.
2978 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2979 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2980 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2981 if (is_legacy(tbl_type.lq_type)) {
2982 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2983 ant_toggle_cnt++;
2984 else if (priv &&
2985 rs_toggle_antenna(valid_tx_ant,
2986 &new_rate, &tbl_type))
2987 ant_toggle_cnt = 1;
2988 }
2989
2990 /* Override next rate if needed for debug purposes */
2991 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2992
2993 /* Fill next table entry */
2994 lq_cmd->rs_table[index].rate_n_flags =
2995 cpu_to_le32(new_rate);
2996 repeat_rate--;
2997 index++;
2998 }
2999
3000 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
3001 &rate_idx);
3002
3003 if (priv && priv->bt_full_concurrent) {
3004 /* 1x1 only */
3005 tbl_type.ant_type =
3006 first_antenna(hw_params(priv).valid_tx_ant);
3007 }
3008
3009 /* Indicate to uCode which entries might be MIMO.
3010 * If initial rate was MIMO, this will finally end up
3011 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
3012 if (is_mimo(tbl_type.lq_type))
3013 lq_cmd->general_params.mimo_delimiter = index;
3014
3015 /* Get next rate */
3016 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
3017 use_ht_possible);
3018
3019 /* How many times should we repeat the next rate? */
3020 if (is_legacy(tbl_type.lq_type)) {
3021 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
3022 ant_toggle_cnt++;
3023 else if (priv &&
3024 rs_toggle_antenna(valid_tx_ant,
3025 &new_rate, &tbl_type))
3026 ant_toggle_cnt = 1;
3027
3028 repeat_rate = IWL_NUMBER_TRY;
3029 } else {
3030 repeat_rate = IWL_HT_NUMBER_TRY;
3031 }
3032
3033 /* Don't allow HT rates after next pass.
3034 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
3035 use_ht_possible = 0;
3036
3037 /* Override next rate if needed for debug purposes */
3038 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
3039
3040 /* Fill next table entry */
3041 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
3042
3043 index++;
3044 repeat_rate--;
3045 }
3046
3047 lq_cmd->agg_params.agg_frame_cnt_limit =
3048 sta_priv->max_agg_bufsize ?: LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3049 lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
3050
3051 lq_cmd->agg_params.agg_time_limit =
3052 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
3053 /*
3054 * overwrite if needed, pass aggregation time limit
3055 * to uCode in uSec
3056 */
3057 if (priv && cfg(priv)->bt_params &&
3058 cfg(priv)->bt_params->agg_time_limit &&
3059 priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH)
3060 lq_cmd->agg_params.agg_time_limit =
3061 cpu_to_le16(cfg(priv)->bt_params->agg_time_limit);
3062 }
3063
3064 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3065 {
3066 return hw->priv;
3067 }
3068 /* rate scale requires free function to be implemented */
3069 static void rs_free(void *priv_rate)
3070 {
3071 return;
3072 }
3073
3074 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
3075 void *priv_sta)
3076 {
3077 struct iwl_priv *priv __maybe_unused = priv_r;
3078
3079 IWL_DEBUG_RATE(priv, "enter\n");
3080 IWL_DEBUG_RATE(priv, "leave\n");
3081 }
3082
3083 #ifdef CONFIG_MAC80211_DEBUGFS
3084 static int open_file_generic(struct inode *inode, struct file *file)
3085 {
3086 file->private_data = inode->i_private;
3087 return 0;
3088 }
3089 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
3090 u32 *rate_n_flags, int index)
3091 {
3092 struct iwl_priv *priv;
3093 u8 valid_tx_ant;
3094 u8 ant_sel_tx;
3095
3096 priv = lq_sta->drv;
3097 valid_tx_ant = hw_params(priv).valid_tx_ant;
3098 if (lq_sta->dbg_fixed_rate) {
3099 ant_sel_tx =
3100 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
3101 >> RATE_MCS_ANT_POS);
3102 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
3103 *rate_n_flags = lq_sta->dbg_fixed_rate;
3104 IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
3105 } else {
3106 lq_sta->dbg_fixed_rate = 0;
3107 IWL_ERR(priv,
3108 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
3109 ant_sel_tx, valid_tx_ant);
3110 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3111 }
3112 } else {
3113 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3114 }
3115 }
3116
3117 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3118 const char __user *user_buf, size_t count, loff_t *ppos)
3119 {
3120 struct iwl_lq_sta *lq_sta = file->private_data;
3121 struct iwl_priv *priv;
3122 char buf[64];
3123 size_t buf_size;
3124 u32 parsed_rate;
3125
3126
3127 priv = lq_sta->drv;
3128 memset(buf, 0, sizeof(buf));
3129 buf_size = min(count, sizeof(buf) - 1);
3130 if (copy_from_user(buf, user_buf, buf_size))
3131 return -EFAULT;
3132
3133 if (sscanf(buf, "%x", &parsed_rate) == 1)
3134 lq_sta->dbg_fixed_rate = parsed_rate;
3135 else
3136 lq_sta->dbg_fixed_rate = 0;
3137
3138 rs_program_fix_rate(priv, lq_sta);
3139
3140 return count;
3141 }
3142
3143 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3144 char __user *user_buf, size_t count, loff_t *ppos)
3145 {
3146 char *buff;
3147 int desc = 0;
3148 int i = 0;
3149 int index = 0;
3150 ssize_t ret;
3151
3152 struct iwl_lq_sta *lq_sta = file->private_data;
3153 struct iwl_priv *priv;
3154 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3155
3156 priv = lq_sta->drv;
3157 buff = kmalloc(1024, GFP_KERNEL);
3158 if (!buff)
3159 return -ENOMEM;
3160
3161 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3162 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
3163 lq_sta->total_failed, lq_sta->total_success,
3164 lq_sta->active_legacy_rate);
3165 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3166 lq_sta->dbg_fixed_rate);
3167 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3168 (hw_params(priv).valid_tx_ant & ANT_A) ? "ANT_A," : "",
3169 (hw_params(priv).valid_tx_ant & ANT_B) ? "ANT_B," : "",
3170 (hw_params(priv).valid_tx_ant & ANT_C) ? "ANT_C" : "");
3171 desc += sprintf(buff+desc, "lq type %s\n",
3172 (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
3173 if (is_Ht(tbl->lq_type)) {
3174 desc += sprintf(buff+desc, " %s",
3175 (is_siso(tbl->lq_type)) ? "SISO" :
3176 ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
3177 desc += sprintf(buff+desc, " %s",
3178 (tbl->is_ht40) ? "40MHz" : "20MHz");
3179 desc += sprintf(buff+desc, " %s %s %s\n", (tbl->is_SGI) ? "SGI" : "",
3180 (lq_sta->is_green) ? "GF enabled" : "",
3181 (lq_sta->is_agg) ? "AGG on" : "");
3182 }
3183 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3184 lq_sta->last_rate_n_flags);
3185 desc += sprintf(buff+desc, "general:"
3186 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
3187 lq_sta->lq.general_params.flags,
3188 lq_sta->lq.general_params.mimo_delimiter,
3189 lq_sta->lq.general_params.single_stream_ant_msk,
3190 lq_sta->lq.general_params.dual_stream_ant_msk);
3191
3192 desc += sprintf(buff+desc, "agg:"
3193 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3194 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
3195 lq_sta->lq.agg_params.agg_dis_start_th,
3196 lq_sta->lq.agg_params.agg_frame_cnt_limit);
3197
3198 desc += sprintf(buff+desc,
3199 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3200 lq_sta->lq.general_params.start_rate_index[0],
3201 lq_sta->lq.general_params.start_rate_index[1],
3202 lq_sta->lq.general_params.start_rate_index[2],
3203 lq_sta->lq.general_params.start_rate_index[3]);
3204
3205 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3206 index = iwl_hwrate_to_plcp_idx(
3207 le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
3208 if (is_legacy(tbl->lq_type)) {
3209 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
3210 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3211 iwl_rate_mcs[index].mbps);
3212 } else {
3213 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
3214 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3215 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
3216 }
3217 }
3218
3219 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3220 kfree(buff);
3221 return ret;
3222 }
3223
3224 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3225 .write = rs_sta_dbgfs_scale_table_write,
3226 .read = rs_sta_dbgfs_scale_table_read,
3227 .open = open_file_generic,
3228 .llseek = default_llseek,
3229 };
3230 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3231 char __user *user_buf, size_t count, loff_t *ppos)
3232 {
3233 char *buff;
3234 int desc = 0;
3235 int i, j;
3236 ssize_t ret;
3237
3238 struct iwl_lq_sta *lq_sta = file->private_data;
3239
3240 buff = kmalloc(1024, GFP_KERNEL);
3241 if (!buff)
3242 return -ENOMEM;
3243
3244 for (i = 0; i < LQ_SIZE; i++) {
3245 desc += sprintf(buff+desc,
3246 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
3247 "rate=0x%X\n",
3248 lq_sta->active_tbl == i ? "*" : "x",
3249 lq_sta->lq_info[i].lq_type,
3250 lq_sta->lq_info[i].is_SGI,
3251 lq_sta->lq_info[i].is_ht40,
3252 lq_sta->lq_info[i].is_dup,
3253 lq_sta->is_green,
3254 lq_sta->lq_info[i].current_rate);
3255 for (j = 0; j < IWL_RATE_COUNT; j++) {
3256 desc += sprintf(buff+desc,
3257 "counter=%d success=%d %%=%d\n",
3258 lq_sta->lq_info[i].win[j].counter,
3259 lq_sta->lq_info[i].win[j].success_counter,
3260 lq_sta->lq_info[i].win[j].success_ratio);
3261 }
3262 }
3263 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3264 kfree(buff);
3265 return ret;
3266 }
3267
3268 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3269 .read = rs_sta_dbgfs_stats_table_read,
3270 .open = open_file_generic,
3271 .llseek = default_llseek,
3272 };
3273
3274 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3275 char __user *user_buf, size_t count, loff_t *ppos)
3276 {
3277 struct iwl_lq_sta *lq_sta = file->private_data;
3278 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3279 char buff[120];
3280 int desc = 0;
3281
3282 if (is_Ht(tbl->lq_type))
3283 desc += sprintf(buff+desc,
3284 "Bit Rate= %d Mb/s\n",
3285 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3286 else
3287 desc += sprintf(buff+desc,
3288 "Bit Rate= %d Mb/s\n",
3289 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3290
3291 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3292 }
3293
3294 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3295 .read = rs_sta_dbgfs_rate_scale_data_read,
3296 .open = open_file_generic,
3297 .llseek = default_llseek,
3298 };
3299
3300 static void rs_add_debugfs(void *priv, void *priv_sta,
3301 struct dentry *dir)
3302 {
3303 struct iwl_lq_sta *lq_sta = priv_sta;
3304 lq_sta->rs_sta_dbgfs_scale_table_file =
3305 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3306 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3307 lq_sta->rs_sta_dbgfs_stats_table_file =
3308 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3309 lq_sta, &rs_sta_dbgfs_stats_table_ops);
3310 lq_sta->rs_sta_dbgfs_rate_scale_data_file =
3311 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
3312 lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
3313 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
3314 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3315 &lq_sta->tx_agg_tid_en);
3316
3317 }
3318
3319 static void rs_remove_debugfs(void *priv, void *priv_sta)
3320 {
3321 struct iwl_lq_sta *lq_sta = priv_sta;
3322 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3323 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
3324 debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
3325 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
3326 }
3327 #endif
3328
3329 /*
3330 * Initialization of rate scaling information is done by driver after
3331 * the station is added. Since mac80211 calls this function before a
3332 * station is added we ignore it.
3333 */
3334 static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband,
3335 struct ieee80211_sta *sta, void *priv_sta)
3336 {
3337 }
3338 static struct rate_control_ops rs_ops = {
3339 .module = NULL,
3340 .name = RS_NAME,
3341 .tx_status = rs_tx_status,
3342 .get_rate = rs_get_rate,
3343 .rate_init = rs_rate_init_stub,
3344 .alloc = rs_alloc,
3345 .free = rs_free,
3346 .alloc_sta = rs_alloc_sta,
3347 .free_sta = rs_free_sta,
3348 #ifdef CONFIG_MAC80211_DEBUGFS
3349 .add_sta_debugfs = rs_add_debugfs,
3350 .remove_sta_debugfs = rs_remove_debugfs,
3351 #endif
3352 };
3353
3354 int iwlagn_rate_control_register(void)
3355 {
3356 return ieee80211_rate_control_register(&rs_ops);
3357 }
3358
3359 void iwlagn_rate_control_unregister(void)
3360 {
3361 ieee80211_rate_control_unregister(&rs_ops);
3362 }
3363