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Linux 3.11-rc3
[cris-mirror.git] / drivers / net / wireless / iwlwifi / mvm / rs.c
blobb328a988c130ec6136f5198d78225870877aa1a4
1 /******************************************************************************
2 *
3 * Copyright(c) 2005 - 2013 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 #include "rs.h"
38 #include "fw-api.h"
39 #include "sta.h"
40 #include "iwl-op-mode.h"
41 #include "mvm.h"
42
43 #define RS_NAME "iwl-mvm-rs"
44
45 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
46 #define IWL_NUMBER_TRY 1
47 #define IWL_HT_NUMBER_TRY 3
48
49 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
50 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
51 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
52
53 /* max allowed rate miss before sync LQ cmd */
54 #define IWL_MISSED_RATE_MAX 15
55 /* max time to accum history 2 seconds */
56 #define IWL_RATE_SCALE_FLUSH_INTVL (3*HZ)
57
58 static u8 rs_ht_to_legacy[] = {
59 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
60 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
61 IWL_RATE_6M_INDEX,
62 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
63 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
64 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
65 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
66 };
67
68 static const u8 ant_toggle_lookup[] = {
69 /*ANT_NONE -> */ ANT_NONE,
70 /*ANT_A -> */ ANT_B,
71 /*ANT_B -> */ ANT_C,
72 /*ANT_AB -> */ ANT_BC,
73 /*ANT_C -> */ ANT_A,
74 /*ANT_AC -> */ ANT_AB,
75 /*ANT_BC -> */ ANT_AC,
76 /*ANT_ABC -> */ ANT_ABC,
77 };
78
79 #define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np) \
80 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
81 IWL_RATE_SISO_##s##M_PLCP, \
82 IWL_RATE_MIMO2_##s##M_PLCP,\
83 IWL_RATE_MIMO3_##s##M_PLCP,\
84 IWL_RATE_##r##M_IEEE, \
85 IWL_RATE_##ip##M_INDEX, \
86 IWL_RATE_##in##M_INDEX, \
87 IWL_RATE_##rp##M_INDEX, \
88 IWL_RATE_##rn##M_INDEX, \
89 IWL_RATE_##pp##M_INDEX, \
90 IWL_RATE_##np##M_INDEX }
91
92 /*
93 * Parameter order:
94 * rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
95 *
96 * If there isn't a valid next or previous rate then INV is used which
97 * maps to IWL_RATE_INVALID
98 *
99 */
100 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
101 IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2), /* 1mbps */
102 IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5), /* 2mbps */
103 IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11), /*5.5mbps */
104 IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18), /* 11mbps */
105 IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11), /* 6mbps */
106 IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11), /* 9mbps */
107 IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18), /* 12mbps */
108 IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24), /* 18mbps */
109 IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36), /* 24mbps */
110 IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48), /* 36mbps */
111 IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54), /* 48mbps */
112 IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
113 IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
114 /* FIXME:RS: ^^ should be INV (legacy) */
115 };
116
117 static inline u8 rs_extract_rate(u32 rate_n_flags)
118 {
119 /* also works for HT because bits 7:6 are zero there */
120 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
121 }
122
123 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
124 {
125 int idx = 0;
126
127 /* HT rate format */
128 if (rate_n_flags & RATE_MCS_HT_MSK) {
129 idx = rs_extract_rate(rate_n_flags);
130
131 if (idx >= IWL_RATE_MIMO3_6M_PLCP)
132 idx = idx - IWL_RATE_MIMO3_6M_PLCP;
133 else if (idx >= IWL_RATE_MIMO2_6M_PLCP)
134 idx = idx - IWL_RATE_MIMO2_6M_PLCP;
135
136 idx += IWL_FIRST_OFDM_RATE;
137 /* skip 9M not supported in ht*/
138 if (idx >= IWL_RATE_9M_INDEX)
139 idx += 1;
140 if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE))
141 return idx;
142
143 /* legacy rate format, search for match in table */
144 } else {
145 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
146 if (iwl_rates[idx].plcp ==
147 rs_extract_rate(rate_n_flags))
148 return idx;
149 }
150
151 return -1;
152 }
153
154 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
155 struct sk_buff *skb,
156 struct ieee80211_sta *sta,
157 struct iwl_lq_sta *lq_sta);
158 static void rs_fill_link_cmd(struct iwl_mvm *mvm,
159 struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
160 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
161
162
163 #ifdef CONFIG_MAC80211_DEBUGFS
164 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
165 u32 *rate_n_flags, int index);
166 #else
167 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
168 u32 *rate_n_flags, int index)
169 {}
170 #endif
171
172 /**
173 * The following tables contain the expected throughput metrics for all rates
174 *
175 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
176 *
177 * where invalid entries are zeros.
178 *
179 * CCK rates are only valid in legacy table and will only be used in G
180 * (2.4 GHz) band.
181 */
182
183 static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
184 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
185 };
186
187 static s32 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
188 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202}, /* Norm */
189 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210}, /* SGI */
190 {0, 0, 0, 0, 47, 0, 91, 133, 171, 242, 305, 334, 362}, /* AGG */
191 {0, 0, 0, 0, 52, 0, 101, 145, 187, 264, 330, 361, 390}, /* AGG+SGI */
192 };
193
194 static s32 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
195 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
196 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
197 {0, 0, 0, 0, 94, 0, 177, 249, 313, 423, 512, 550, 586}, /* AGG */
198 {0, 0, 0, 0, 104, 0, 193, 270, 338, 454, 545, 584, 620}, /* AGG+SGI */
199 };
200
201 static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
202 {0, 0, 0, 0, 74, 0, 123, 155, 179, 214, 236, 244, 251}, /* Norm */
203 {0, 0, 0, 0, 81, 0, 131, 164, 188, 223, 243, 251, 257}, /* SGI */
204 {0, 0, 0, 0, 89, 0, 167, 235, 296, 402, 488, 526, 560}, /* AGG */
205 {0, 0, 0, 0, 97, 0, 182, 255, 320, 431, 520, 558, 593}, /* AGG+SGI*/
206 };
207
208 static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
209 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
210 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
211 {0, 0, 0, 0, 171, 0, 305, 410, 496, 634, 731, 771, 805}, /* AGG */
212 {0, 0, 0, 0, 186, 0, 329, 439, 527, 667, 764, 803, 838}, /* AGG+SGI */
213 };
214
215 static s32 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = {
216 {0, 0, 0, 0, 99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */
217 {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */
218 {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */
219 {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */
220 };
221
222 static s32 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = {
223 {0, 0, 0, 0, 152, 0, 211, 239, 255, 279, 290, 294, 297}, /* Norm */
224 {0, 0, 0, 0, 160, 0, 219, 245, 261, 284, 294, 297, 300}, /* SGI */
225 {0, 0, 0, 0, 254, 0, 443, 584, 695, 868, 984, 1030, 1070}, /* AGG */
226 {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */
227 };
228
229 /* mbps, mcs */
230 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
231 { "1", "BPSK DSSS"},
232 { "2", "QPSK DSSS"},
233 {"5.5", "BPSK CCK"},
234 { "11", "QPSK CCK"},
235 { "6", "BPSK 1/2"},
236 { "9", "BPSK 1/2"},
237 { "12", "QPSK 1/2"},
238 { "18", "QPSK 3/4"},
239 { "24", "16QAM 1/2"},
240 { "36", "16QAM 3/4"},
241 { "48", "64QAM 2/3"},
242 { "54", "64QAM 3/4"},
243 { "60", "64QAM 5/6"},
244 };
245
246 #define MCS_INDEX_PER_STREAM (8)
247
248 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
249 {
250 window->data = 0;
251 window->success_counter = 0;
252 window->success_ratio = IWL_INVALID_VALUE;
253 window->counter = 0;
254 window->average_tpt = IWL_INVALID_VALUE;
255 window->stamp = 0;
256 }
257
258 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
259 {
260 return (ant_type & valid_antenna) == ant_type;
261 }
262
263 /*
264 * removes the old data from the statistics. All data that is older than
265 * TID_MAX_TIME_DIFF, will be deleted.
266 */
267 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
268 {
269 /* The oldest age we want to keep */
270 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
271
272 while (tl->queue_count &&
273 (tl->time_stamp < oldest_time)) {
274 tl->total -= tl->packet_count[tl->head];
275 tl->packet_count[tl->head] = 0;
276 tl->time_stamp += TID_QUEUE_CELL_SPACING;
277 tl->queue_count--;
278 tl->head++;
279 if (tl->head >= TID_QUEUE_MAX_SIZE)
280 tl->head = 0;
281 }
282 }
283
284 /*
285 * increment traffic load value for tid and also remove
286 * any old values if passed the certain time period
287 */
288 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
289 struct ieee80211_hdr *hdr)
290 {
291 u32 curr_time = jiffies_to_msecs(jiffies);
292 u32 time_diff;
293 s32 index;
294 struct iwl_traffic_load *tl = NULL;
295 u8 tid;
296
297 if (ieee80211_is_data_qos(hdr->frame_control)) {
298 u8 *qc = ieee80211_get_qos_ctl(hdr);
299 tid = qc[0] & 0xf;
300 } else {
301 return IWL_MAX_TID_COUNT;
302 }
303
304 if (unlikely(tid >= IWL_MAX_TID_COUNT))
305 return IWL_MAX_TID_COUNT;
306
307 tl = &lq_data->load[tid];
308
309 curr_time -= curr_time % TID_ROUND_VALUE;
310
311 /* Happens only for the first packet. Initialize the data */
312 if (!(tl->queue_count)) {
313 tl->total = 1;
314 tl->time_stamp = curr_time;
315 tl->queue_count = 1;
316 tl->head = 0;
317 tl->packet_count[0] = 1;
318 return IWL_MAX_TID_COUNT;
319 }
320
321 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
322 index = time_diff / TID_QUEUE_CELL_SPACING;
323
324 /* The history is too long: remove data that is older than */
325 /* TID_MAX_TIME_DIFF */
326 if (index >= TID_QUEUE_MAX_SIZE)
327 rs_tl_rm_old_stats(tl, curr_time);
328
329 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
330 tl->packet_count[index] = tl->packet_count[index] + 1;
331 tl->total = tl->total + 1;
332
333 if ((index + 1) > tl->queue_count)
334 tl->queue_count = index + 1;
335
336 return tid;
337 }
338
339 #ifdef CONFIG_MAC80211_DEBUGFS
340 /**
341 * Program the device to use fixed rate for frame transmit
342 * This is for debugging/testing only
343 * once the device start use fixed rate, we need to reload the module
344 * to being back the normal operation.
345 */
346 static void rs_program_fix_rate(struct iwl_mvm *mvm,
347 struct iwl_lq_sta *lq_sta)
348 {
349 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
350 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
351 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
352 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
353
354 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
355 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
356
357 if (lq_sta->dbg_fixed_rate) {
358 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
359 iwl_mvm_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC, false);
360 }
361 }
362 #endif
363
364 /*
365 get the traffic load value for tid
366 */
367 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
368 {
369 u32 curr_time = jiffies_to_msecs(jiffies);
370 u32 time_diff;
371 s32 index;
372 struct iwl_traffic_load *tl = NULL;
373
374 if (tid >= IWL_MAX_TID_COUNT)
375 return 0;
376
377 tl = &(lq_data->load[tid]);
378
379 curr_time -= curr_time % TID_ROUND_VALUE;
380
381 if (!(tl->queue_count))
382 return 0;
383
384 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
385 index = time_diff / TID_QUEUE_CELL_SPACING;
386
387 /* The history is too long: remove data that is older than */
388 /* TID_MAX_TIME_DIFF */
389 if (index >= TID_QUEUE_MAX_SIZE)
390 rs_tl_rm_old_stats(tl, curr_time);
391
392 return tl->total;
393 }
394
395 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
396 struct iwl_lq_sta *lq_data, u8 tid,
397 struct ieee80211_sta *sta)
398 {
399 int ret = -EAGAIN;
400 u32 load;
401
402 load = rs_tl_get_load(lq_data, tid);
403
404 /*
405 * Don't create TX aggregation sessions when in high
406 * BT traffic, as they would just be disrupted by BT.
407 */
408 if (BT_MBOX_MSG(&mvm->last_bt_notif, 3, TRAFFIC_LOAD) >= 2) {
409 IWL_DEBUG_COEX(mvm, "BT traffic (%d), no aggregation allowed\n",
410 BT_MBOX_MSG(&mvm->last_bt_notif,
411 3, TRAFFIC_LOAD));
412 return ret;
413 }
414
415 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
416 sta->addr, tid);
417 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
418 if (ret == -EAGAIN) {
419 /*
420 * driver and mac80211 is out of sync
421 * this might be cause by reloading firmware
422 * stop the tx ba session here
423 */
424 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
425 tid);
426 ieee80211_stop_tx_ba_session(sta, tid);
427 }
428 return ret;
429 }
430
431 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
432 struct iwl_lq_sta *lq_data,
433 struct ieee80211_sta *sta)
434 {
435 if (tid < IWL_MAX_TID_COUNT)
436 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
437 else
438 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
439 tid, IWL_MAX_TID_COUNT);
440 }
441
442 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
443 {
444 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
445 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
446 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
447 }
448
449 /*
450 * Static function to get the expected throughput from an iwl_scale_tbl_info
451 * that wraps a NULL pointer check
452 */
453 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
454 {
455 if (tbl->expected_tpt)
456 return tbl->expected_tpt[rs_index];
457 return 0;
458 }
459
460 /**
461 * rs_collect_tx_data - Update the success/failure sliding window
462 *
463 * We keep a sliding window of the last 62 packets transmitted
464 * at this rate. window->data contains the bitmask of successful
465 * packets.
466 */
467 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
468 int scale_index, int attempts, int successes)
469 {
470 struct iwl_rate_scale_data *window = NULL;
471 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
472 s32 fail_count, tpt;
473
474 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
475 return -EINVAL;
476
477 /* Select window for current tx bit rate */
478 window = &(tbl->win[scale_index]);
479
480 /* Get expected throughput */
481 tpt = get_expected_tpt(tbl, scale_index);
482
483 /*
484 * Keep track of only the latest 62 tx frame attempts in this rate's
485 * history window; anything older isn't really relevant any more.
486 * If we have filled up the sliding window, drop the oldest attempt;
487 * if the oldest attempt (highest bit in bitmap) shows "success",
488 * subtract "1" from the success counter (this is the main reason
489 * we keep these bitmaps!).
490 */
491 while (attempts > 0) {
492 if (window->counter >= IWL_RATE_MAX_WINDOW) {
493 /* remove earliest */
494 window->counter = IWL_RATE_MAX_WINDOW - 1;
495
496 if (window->data & mask) {
497 window->data &= ~mask;
498 window->success_counter--;
499 }
500 }
501
502 /* Increment frames-attempted counter */
503 window->counter++;
504
505 /* Shift bitmap by one frame to throw away oldest history */
506 window->data <<= 1;
507
508 /* Mark the most recent #successes attempts as successful */
509 if (successes > 0) {
510 window->success_counter++;
511 window->data |= 0x1;
512 successes--;
513 }
514
515 attempts--;
516 }
517
518 /* Calculate current success ratio, avoid divide-by-0! */
519 if (window->counter > 0)
520 window->success_ratio = 128 * (100 * window->success_counter)
521 / window->counter;
522 else
523 window->success_ratio = IWL_INVALID_VALUE;
524
525 fail_count = window->counter - window->success_counter;
526
527 /* Calculate average throughput, if we have enough history. */
528 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
529 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
530 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
531 else
532 window->average_tpt = IWL_INVALID_VALUE;
533
534 /* Tag this window as having been updated */
535 window->stamp = jiffies;
536
537 return 0;
538 }
539
540 /*
541 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
542 */
543 /* FIXME:RS:remove this function and put the flags statically in the table */
544 static u32 rate_n_flags_from_tbl(struct iwl_mvm *mvm,
545 struct iwl_scale_tbl_info *tbl,
546 int index, u8 use_green)
547 {
548 u32 rate_n_flags = 0;
549
550 if (is_legacy(tbl->lq_type)) {
551 rate_n_flags = iwl_rates[index].plcp;
552 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
553 rate_n_flags |= RATE_MCS_CCK_MSK;
554 } else if (is_Ht(tbl->lq_type)) {
555 if (index > IWL_LAST_OFDM_RATE) {
556 IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
557 index = IWL_LAST_OFDM_RATE;
558 }
559 rate_n_flags = RATE_MCS_HT_MSK;
560
561 if (is_siso(tbl->lq_type))
562 rate_n_flags |= iwl_rates[index].plcp_siso;
563 else if (is_mimo2(tbl->lq_type))
564 rate_n_flags |= iwl_rates[index].plcp_mimo2;
565 else
566 rate_n_flags |= iwl_rates[index].plcp_mimo3;
567 } else {
568 IWL_ERR(mvm, "Invalid tbl->lq_type %d\n", tbl->lq_type);
569 }
570
571 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
572 RATE_MCS_ANT_ABC_MSK);
573
574 if (is_Ht(tbl->lq_type)) {
575 if (tbl->is_ht40)
576 rate_n_flags |= RATE_MCS_CHAN_WIDTH_40;
577 if (tbl->is_SGI)
578 rate_n_flags |= RATE_MCS_SGI_MSK;
579
580 if (use_green) {
581 rate_n_flags |= RATE_HT_MCS_GF_MSK;
582 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
583 rate_n_flags &= ~RATE_MCS_SGI_MSK;
584 IWL_ERR(mvm, "GF was set with SGI:SISO\n");
585 }
586 }
587 }
588 return rate_n_flags;
589 }
590
591 /*
592 * Interpret uCode API's rate_n_flags format,
593 * fill "search" or "active" tx mode table.
594 */
595 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
596 enum ieee80211_band band,
597 struct iwl_scale_tbl_info *tbl,
598 int *rate_idx)
599 {
600 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
601 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
602 u8 mcs;
603
604 memset(tbl, 0, sizeof(struct iwl_scale_tbl_info));
605 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
606
607 if (*rate_idx == IWL_RATE_INVALID) {
608 *rate_idx = -1;
609 return -EINVAL;
610 }
611 tbl->is_SGI = 0; /* default legacy setup */
612 tbl->is_ht40 = 0;
613 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
614 tbl->lq_type = LQ_NONE;
615 tbl->max_search = IWL_MAX_SEARCH;
616
617 /* legacy rate format */
618 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
619 if (num_of_ant == 1) {
620 if (band == IEEE80211_BAND_5GHZ)
621 tbl->lq_type = LQ_A;
622 else
623 tbl->lq_type = LQ_G;
624 }
625 /* HT rate format */
626 } else {
627 if (rate_n_flags & RATE_MCS_SGI_MSK)
628 tbl->is_SGI = 1;
629
630 if (rate_n_flags & RATE_MCS_CHAN_WIDTH_40) /* TODO */
631 tbl->is_ht40 = 1;
632
633 mcs = rs_extract_rate(rate_n_flags);
634
635 /* SISO */
636 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
637 if (num_of_ant == 1)
638 tbl->lq_type = LQ_SISO; /*else NONE*/
639 /* MIMO2 */
640 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
641 if (num_of_ant == 2)
642 tbl->lq_type = LQ_MIMO2;
643 /* MIMO3 */
644 } else {
645 if (num_of_ant == 3) {
646 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
647 tbl->lq_type = LQ_MIMO3;
648 }
649 }
650 }
651 return 0;
652 }
653
654 /* switch to another antenna/antennas and return 1 */
655 /* if no other valid antenna found, return 0 */
656 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
657 struct iwl_scale_tbl_info *tbl)
658 {
659 u8 new_ant_type;
660
661 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
662 return 0;
663
664 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
665 return 0;
666
667 new_ant_type = ant_toggle_lookup[tbl->ant_type];
668
669 while ((new_ant_type != tbl->ant_type) &&
670 !rs_is_valid_ant(valid_ant, new_ant_type))
671 new_ant_type = ant_toggle_lookup[new_ant_type];
672
673 if (new_ant_type == tbl->ant_type)
674 return 0;
675
676 tbl->ant_type = new_ant_type;
677 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
678 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
679 return 1;
680 }
681
682 /**
683 * Green-field mode is valid if the station supports it and
684 * there are no non-GF stations present in the BSS.
685 */
686 static bool rs_use_green(struct ieee80211_sta *sta)
687 {
688 /*
689 * There's a bug somewhere in this code that causes the
690 * scaling to get stuck because GF+SGI can't be combined
691 * in SISO rates. Until we find that bug, disable GF, it
692 * has only limited benefit and we still interoperate with
693 * GF APs since we can always receive GF transmissions.
694 */
695 return false;
696 }
697
698 /**
699 * rs_get_supported_rates - get the available rates
700 *
701 * if management frame or broadcast frame only return
702 * basic available rates.
703 *
704 */
705 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
706 struct ieee80211_hdr *hdr,
707 enum iwl_table_type rate_type)
708 {
709 if (is_legacy(rate_type)) {
710 return lq_sta->active_legacy_rate;
711 } else {
712 if (is_siso(rate_type))
713 return lq_sta->active_siso_rate;
714 else if (is_mimo2(rate_type))
715 return lq_sta->active_mimo2_rate;
716 else
717 return lq_sta->active_mimo3_rate;
718 }
719 }
720
721 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
722 int rate_type)
723 {
724 u8 high = IWL_RATE_INVALID;
725 u8 low = IWL_RATE_INVALID;
726
727 /* 802.11A or ht walks to the next literal adjacent rate in
728 * the rate table */
729 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
730 int i;
731 u32 mask;
732
733 /* Find the previous rate that is in the rate mask */
734 i = index - 1;
735 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
736 if (rate_mask & mask) {
737 low = i;
738 break;
739 }
740 }
741
742 /* Find the next rate that is in the rate mask */
743 i = index + 1;
744 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
745 if (rate_mask & mask) {
746 high = i;
747 break;
748 }
749 }
750
751 return (high << 8) | low;
752 }
753
754 low = index;
755 while (low != IWL_RATE_INVALID) {
756 low = iwl_rates[low].prev_rs;
757 if (low == IWL_RATE_INVALID)
758 break;
759 if (rate_mask & (1 << low))
760 break;
761 IWL_DEBUG_RATE(mvm, "Skipping masked lower rate: %d\n", low);
762 }
763
764 high = index;
765 while (high != IWL_RATE_INVALID) {
766 high = iwl_rates[high].next_rs;
767 if (high == IWL_RATE_INVALID)
768 break;
769 if (rate_mask & (1 << high))
770 break;
771 IWL_DEBUG_RATE(mvm, "Skipping masked higher rate: %d\n", high);
772 }
773
774 return (high << 8) | low;
775 }
776
777 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
778 struct iwl_scale_tbl_info *tbl,
779 u8 scale_index, u8 ht_possible)
780 {
781 s32 low;
782 u16 rate_mask;
783 u16 high_low;
784 u8 switch_to_legacy = 0;
785 u8 is_green = lq_sta->is_green;
786 struct iwl_mvm *mvm = lq_sta->drv;
787
788 /* check if we need to switch from HT to legacy rates.
789 * assumption is that mandatory rates (1Mbps or 6Mbps)
790 * are always supported (spec demand) */
791 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
792 switch_to_legacy = 1;
793 scale_index = rs_ht_to_legacy[scale_index];
794 if (lq_sta->band == IEEE80211_BAND_5GHZ)
795 tbl->lq_type = LQ_A;
796 else
797 tbl->lq_type = LQ_G;
798
799 if (num_of_ant(tbl->ant_type) > 1)
800 tbl->ant_type =
801 first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
802
803 tbl->is_ht40 = 0;
804 tbl->is_SGI = 0;
805 tbl->max_search = IWL_MAX_SEARCH;
806 }
807
808 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
809
810 /* Mask with station rate restriction */
811 if (is_legacy(tbl->lq_type)) {
812 /* supp_rates has no CCK bits in A mode */
813 if (lq_sta->band == IEEE80211_BAND_5GHZ)
814 rate_mask = (u16)(rate_mask &
815 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
816 else
817 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
818 }
819
820 /* If we switched from HT to legacy, check current rate */
821 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
822 low = scale_index;
823 goto out;
824 }
825
826 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
827 tbl->lq_type);
828 low = high_low & 0xff;
829
830 if (low == IWL_RATE_INVALID)
831 low = scale_index;
832
833 out:
834 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
835 }
836
837 /*
838 * Simple function to compare two rate scale table types
839 */
840 static bool table_type_matches(struct iwl_scale_tbl_info *a,
841 struct iwl_scale_tbl_info *b)
842 {
843 return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
844 (a->is_SGI == b->is_SGI);
845 }
846
847 /*
848 * mac80211 sends us Tx status
849 */
850 static void rs_tx_status(void *mvm_r, struct ieee80211_supported_band *sband,
851 struct ieee80211_sta *sta, void *priv_sta,
852 struct sk_buff *skb)
853 {
854 int legacy_success;
855 int retries;
856 int rs_index, mac_index, i;
857 struct iwl_lq_sta *lq_sta = priv_sta;
858 struct iwl_lq_cmd *table;
859 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
860 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
861 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
862 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
863 enum mac80211_rate_control_flags mac_flags;
864 u32 tx_rate;
865 struct iwl_scale_tbl_info tbl_type;
866 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
867
868 IWL_DEBUG_RATE_LIMIT(mvm,
869 "get frame ack response, update rate scale window\n");
870
871 /* Treat uninitialized rate scaling data same as non-existing. */
872 if (!lq_sta) {
873 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
874 return;
875 } else if (!lq_sta->drv) {
876 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
877 return;
878 }
879
880 if (!ieee80211_is_data(hdr->frame_control) ||
881 info->flags & IEEE80211_TX_CTL_NO_ACK)
882 return;
883
884 /* This packet was aggregated but doesn't carry status info */
885 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
886 !(info->flags & IEEE80211_TX_STAT_AMPDU))
887 return;
888
889 /*
890 * Ignore this Tx frame response if its initial rate doesn't match
891 * that of latest Link Quality command. There may be stragglers
892 * from a previous Link Quality command, but we're no longer interested
893 * in those; they're either from the "active" mode while we're trying
894 * to check "search" mode, or a prior "search" mode after we've moved
895 * to a new "search" mode (which might become the new "active" mode).
896 */
897 table = &lq_sta->lq;
898 tx_rate = le32_to_cpu(table->rs_table[0]);
899 rs_get_tbl_info_from_mcs(tx_rate, info->band, &tbl_type, &rs_index);
900 if (info->band == IEEE80211_BAND_5GHZ)
901 rs_index -= IWL_FIRST_OFDM_RATE;
902 mac_flags = info->status.rates[0].flags;
903 mac_index = info->status.rates[0].idx;
904 /* For HT packets, map MCS to PLCP */
905 if (mac_flags & IEEE80211_TX_RC_MCS) {
906 /* Remove # of streams */
907 mac_index &= RATE_HT_MCS_RATE_CODE_MSK;
908 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
909 mac_index++;
910 /*
911 * mac80211 HT index is always zero-indexed; we need to move
912 * HT OFDM rates after CCK rates in 2.4 GHz band
913 */
914 if (info->band == IEEE80211_BAND_2GHZ)
915 mac_index += IWL_FIRST_OFDM_RATE;
916 }
917 /* Here we actually compare this rate to the latest LQ command */
918 if ((mac_index < 0) ||
919 (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
920 (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
921 (tbl_type.ant_type != info->status.antenna) ||
922 (!!(tx_rate & RATE_MCS_HT_MSK) !=
923 !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
924 (!!(tx_rate & RATE_HT_MCS_GF_MSK) !=
925 !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
926 (rs_index != mac_index)) {
927 IWL_DEBUG_RATE(mvm,
928 "initial rate %d does not match %d (0x%x)\n",
929 mac_index, rs_index, tx_rate);
930 /*
931 * Since rates mis-match, the last LQ command may have failed.
932 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
933 * ... driver.
934 */
935 lq_sta->missed_rate_counter++;
936 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
937 lq_sta->missed_rate_counter = 0;
938 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, CMD_ASYNC, false);
939 }
940 /* Regardless, ignore this status info for outdated rate */
941 return;
942 } else
943 /* Rate did match, so reset the missed_rate_counter */
944 lq_sta->missed_rate_counter = 0;
945
946 /* Figure out if rate scale algorithm is in active or search table */
947 if (table_type_matches(&tbl_type,
948 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
949 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
950 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
951 } else if (table_type_matches(
952 &tbl_type, &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
953 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
954 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
955 } else {
956 IWL_DEBUG_RATE(mvm,
957 "Neither active nor search matches tx rate\n");
958 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
959 IWL_DEBUG_RATE(mvm, "active- lq:%x, ant:%x, SGI:%d\n",
960 tmp_tbl->lq_type, tmp_tbl->ant_type,
961 tmp_tbl->is_SGI);
962 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
963 IWL_DEBUG_RATE(mvm, "search- lq:%x, ant:%x, SGI:%d\n",
964 tmp_tbl->lq_type, tmp_tbl->ant_type,
965 tmp_tbl->is_SGI);
966 IWL_DEBUG_RATE(mvm, "actual- lq:%x, ant:%x, SGI:%d\n",
967 tbl_type.lq_type, tbl_type.ant_type,
968 tbl_type.is_SGI);
969 /*
970 * no matching table found, let's by-pass the data collection
971 * and continue to perform rate scale to find the rate table
972 */
973 rs_stay_in_table(lq_sta, true);
974 goto done;
975 }
976
977 /*
978 * Updating the frame history depends on whether packets were
979 * aggregated.
980 *
981 * For aggregation, all packets were transmitted at the same rate, the
982 * first index into rate scale table.
983 */
984 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
985 tx_rate = le32_to_cpu(table->rs_table[0]);
986 rs_get_tbl_info_from_mcs(tx_rate, info->band, &tbl_type,
987 &rs_index);
988 rs_collect_tx_data(curr_tbl, rs_index,
989 info->status.ampdu_len,
990 info->status.ampdu_ack_len);
991
992 /* Update success/fail counts if not searching for new mode */
993 if (lq_sta->stay_in_tbl) {
994 lq_sta->total_success += info->status.ampdu_ack_len;
995 lq_sta->total_failed += (info->status.ampdu_len -
996 info->status.ampdu_ack_len);
997 }
998 } else {
999 /*
1000 * For legacy, update frame history with for each Tx retry.
1001 */
1002 retries = info->status.rates[0].count - 1;
1003 /* HW doesn't send more than 15 retries */
1004 retries = min(retries, 15);
1005
1006 /* The last transmission may have been successful */
1007 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1008 /* Collect data for each rate used during failed TX attempts */
1009 for (i = 0; i <= retries; ++i) {
1010 tx_rate = le32_to_cpu(table->rs_table[i]);
1011 rs_get_tbl_info_from_mcs(tx_rate, info->band,
1012 &tbl_type, &rs_index);
1013 /*
1014 * Only collect stats if retried rate is in the same RS
1015 * table as active/search.
1016 */
1017 if (table_type_matches(&tbl_type, curr_tbl))
1018 tmp_tbl = curr_tbl;
1019 else if (table_type_matches(&tbl_type, other_tbl))
1020 tmp_tbl = other_tbl;
1021 else
1022 continue;
1023 rs_collect_tx_data(tmp_tbl, rs_index, 1,
1024 i < retries ? 0 : legacy_success);
1025 }
1026
1027 /* Update success/fail counts if not searching for new mode */
1028 if (lq_sta->stay_in_tbl) {
1029 lq_sta->total_success += legacy_success;
1030 lq_sta->total_failed += retries + (1 - legacy_success);
1031 }
1032 }
1033 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1034 lq_sta->last_rate_n_flags = tx_rate;
1035 done:
1036 /* See if there's a better rate or modulation mode to try. */
1037 if (sta && sta->supp_rates[sband->band])
1038 rs_rate_scale_perform(mvm, skb, sta, lq_sta);
1039 }
1040
1041 /*
1042 * Begin a period of staying with a selected modulation mode.
1043 * Set "stay_in_tbl" flag to prevent any mode switches.
1044 * Set frame tx success limits according to legacy vs. high-throughput,
1045 * and reset overall (spanning all rates) tx success history statistics.
1046 * These control how long we stay using same modulation mode before
1047 * searching for a new mode.
1048 */
1049 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1050 struct iwl_lq_sta *lq_sta)
1051 {
1052 IWL_DEBUG_RATE(mvm, "we are staying in the same table\n");
1053 lq_sta->stay_in_tbl = 1; /* only place this gets set */
1054 if (is_legacy) {
1055 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1056 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1057 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1058 } else {
1059 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1060 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1061 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1062 }
1063 lq_sta->table_count = 0;
1064 lq_sta->total_failed = 0;
1065 lq_sta->total_success = 0;
1066 lq_sta->flush_timer = jiffies;
1067 lq_sta->action_counter = 0;
1068 }
1069
1070 /*
1071 * Find correct throughput table for given mode of modulation
1072 */
1073 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1074 struct iwl_scale_tbl_info *tbl)
1075 {
1076 /* Used to choose among HT tables */
1077 s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1078
1079 /* Check for invalid LQ type */
1080 if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1081 tbl->expected_tpt = expected_tpt_legacy;
1082 return;
1083 }
1084
1085 /* Legacy rates have only one table */
1086 if (is_legacy(tbl->lq_type)) {
1087 tbl->expected_tpt = expected_tpt_legacy;
1088 return;
1089 }
1090
1091 /* Choose among many HT tables depending on number of streams
1092 * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
1093 * status */
1094 if (is_siso(tbl->lq_type) && !tbl->is_ht40)
1095 ht_tbl_pointer = expected_tpt_siso20MHz;
1096 else if (is_siso(tbl->lq_type))
1097 ht_tbl_pointer = expected_tpt_siso40MHz;
1098 else if (is_mimo2(tbl->lq_type) && !tbl->is_ht40)
1099 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1100 else if (is_mimo2(tbl->lq_type))
1101 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1102 else if (is_mimo3(tbl->lq_type) && !tbl->is_ht40)
1103 ht_tbl_pointer = expected_tpt_mimo3_20MHz;
1104 else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
1105 ht_tbl_pointer = expected_tpt_mimo3_40MHz;
1106
1107 if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */
1108 tbl->expected_tpt = ht_tbl_pointer[0];
1109 else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */
1110 tbl->expected_tpt = ht_tbl_pointer[1];
1111 else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */
1112 tbl->expected_tpt = ht_tbl_pointer[2];
1113 else /* AGG+SGI */
1114 tbl->expected_tpt = ht_tbl_pointer[3];
1115 }
1116
1117 /*
1118 * Find starting rate for new "search" high-throughput mode of modulation.
1119 * Goal is to find lowest expected rate (under perfect conditions) that is
1120 * above the current measured throughput of "active" mode, to give new mode
1121 * a fair chance to prove itself without too many challenges.
1122 *
1123 * This gets called when transitioning to more aggressive modulation
1124 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1125 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1126 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1127 * bit rate will typically need to increase, but not if performance was bad.
1128 */
1129 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1130 struct iwl_lq_sta *lq_sta,
1131 struct iwl_scale_tbl_info *tbl, /* "search" */
1132 u16 rate_mask, s8 index)
1133 {
1134 /* "active" values */
1135 struct iwl_scale_tbl_info *active_tbl =
1136 &(lq_sta->lq_info[lq_sta->active_tbl]);
1137 s32 active_sr = active_tbl->win[index].success_ratio;
1138 s32 active_tpt = active_tbl->expected_tpt[index];
1139
1140 /* expected "search" throughput */
1141 s32 *tpt_tbl = tbl->expected_tpt;
1142
1143 s32 new_rate, high, low, start_hi;
1144 u16 high_low;
1145 s8 rate = index;
1146
1147 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1148
1149 while (1) {
1150 high_low = rs_get_adjacent_rate(mvm, rate, rate_mask,
1151 tbl->lq_type);
1152
1153 low = high_low & 0xff;
1154 high = (high_low >> 8) & 0xff;
1155
1156 /*
1157 * Lower the "search" bit rate, to give new "search" mode
1158 * approximately the same throughput as "active" if:
1159 *
1160 * 1) "Active" mode has been working modestly well (but not
1161 * great), and expected "search" throughput (under perfect
1162 * conditions) at candidate rate is above the actual
1163 * measured "active" throughput (but less than expected
1164 * "active" throughput under perfect conditions).
1165 * OR
1166 * 2) "Active" mode has been working perfectly or very well
1167 * and expected "search" throughput (under perfect
1168 * conditions) at candidate rate is above expected
1169 * "active" throughput (under perfect conditions).
1170 */
1171 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1172 ((active_sr > IWL_RATE_DECREASE_TH) &&
1173 (active_sr <= IWL_RATE_HIGH_TH) &&
1174 (tpt_tbl[rate] <= active_tpt))) ||
1175 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1176 (tpt_tbl[rate] > active_tpt))) {
1177 /* (2nd or later pass)
1178 * If we've already tried to raise the rate, and are
1179 * now trying to lower it, use the higher rate. */
1180 if (start_hi != IWL_RATE_INVALID) {
1181 new_rate = start_hi;
1182 break;
1183 }
1184
1185 new_rate = rate;
1186
1187 /* Loop again with lower rate */
1188 if (low != IWL_RATE_INVALID)
1189 rate = low;
1190
1191 /* Lower rate not available, use the original */
1192 else
1193 break;
1194
1195 /* Else try to raise the "search" rate to match "active" */
1196 } else {
1197 /* (2nd or later pass)
1198 * If we've already tried to lower the rate, and are
1199 * now trying to raise it, use the lower rate. */
1200 if (new_rate != IWL_RATE_INVALID)
1201 break;
1202
1203 /* Loop again with higher rate */
1204 else if (high != IWL_RATE_INVALID) {
1205 start_hi = high;
1206 rate = high;
1207
1208 /* Higher rate not available, use the original */
1209 } else {
1210 new_rate = rate;
1211 break;
1212 }
1213 }
1214 }
1215
1216 return new_rate;
1217 }
1218
1219 static bool iwl_is_ht40_tx_allowed(struct ieee80211_sta *sta)
1220 {
1221 return sta->bandwidth >= IEEE80211_STA_RX_BW_40;
1222 }
1223
1224 /*
1225 * Set up search table for MIMO2
1226 */
1227 static int rs_switch_to_mimo2(struct iwl_mvm *mvm,
1228 struct iwl_lq_sta *lq_sta,
1229 struct ieee80211_sta *sta,
1230 struct iwl_scale_tbl_info *tbl, int index)
1231 {
1232 u16 rate_mask;
1233 s32 rate;
1234 s8 is_green = lq_sta->is_green;
1235
1236 if (!sta->ht_cap.ht_supported)
1237 return -1;
1238
1239 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
1240 return -1;
1241
1242 /* Need both Tx chains/antennas to support MIMO */
1243 if (num_of_ant(iwl_fw_valid_tx_ant(mvm->fw)) < 2)
1244 return -1;
1245
1246 IWL_DEBUG_RATE(mvm, "LQ: try to switch to MIMO2\n");
1247
1248 tbl->lq_type = LQ_MIMO2;
1249 tbl->action = 0;
1250 tbl->max_search = IWL_MAX_SEARCH;
1251 rate_mask = lq_sta->active_mimo2_rate;
1252
1253 if (iwl_is_ht40_tx_allowed(sta))
1254 tbl->is_ht40 = 1;
1255 else
1256 tbl->is_ht40 = 0;
1257
1258 rs_set_expected_tpt_table(lq_sta, tbl);
1259
1260 rate = rs_get_best_rate(mvm, lq_sta, tbl, rate_mask, index);
1261
1262 IWL_DEBUG_RATE(mvm, "LQ: MIMO2 best rate %d mask %X\n",
1263 rate, rate_mask);
1264 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1265 IWL_DEBUG_RATE(mvm, "Can't switch with index %d rate mask %x\n",
1266 rate, rate_mask);
1267 return -1;
1268 }
1269 tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, rate, is_green);
1270
1271 IWL_DEBUG_RATE(mvm, "LQ: Switch to new mcs %X index is green %X\n",
1272 tbl->current_rate, is_green);
1273 return 0;
1274 }
1275
1276 /*
1277 * Set up search table for MIMO3
1278 */
1279 static int rs_switch_to_mimo3(struct iwl_mvm *mvm,
1280 struct iwl_lq_sta *lq_sta,
1281 struct ieee80211_sta *sta,
1282 struct iwl_scale_tbl_info *tbl, int index)
1283 {
1284 u16 rate_mask;
1285 s32 rate;
1286 s8 is_green = lq_sta->is_green;
1287
1288 if (!sta->ht_cap.ht_supported)
1289 return -1;
1290
1291 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
1292 return -1;
1293
1294 /* Need both Tx chains/antennas to support MIMO */
1295 if (num_of_ant(iwl_fw_valid_tx_ant(mvm->fw)) < 3)
1296 return -1;
1297
1298 IWL_DEBUG_RATE(mvm, "LQ: try to switch to MIMO3\n");
1299
1300 tbl->lq_type = LQ_MIMO3;
1301 tbl->action = 0;
1302 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1303 rate_mask = lq_sta->active_mimo3_rate;
1304
1305 if (iwl_is_ht40_tx_allowed(sta))
1306 tbl->is_ht40 = 1;
1307 else
1308 tbl->is_ht40 = 0;
1309
1310 rs_set_expected_tpt_table(lq_sta, tbl);
1311
1312 rate = rs_get_best_rate(mvm, lq_sta, tbl, rate_mask, index);
1313
1314 IWL_DEBUG_RATE(mvm, "LQ: MIMO3 best rate %d mask %X\n",
1315 rate, rate_mask);
1316 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1317 IWL_DEBUG_RATE(mvm, "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(mvm, tbl, rate, is_green);
1322
1323 IWL_DEBUG_RATE(mvm, "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 SISO
1330 */
1331 static int rs_switch_to_siso(struct iwl_mvm *mvm,
1332 struct iwl_lq_sta *lq_sta,
1333 struct ieee80211_sta *sta,
1334 struct iwl_scale_tbl_info *tbl, int index)
1335 {
1336 u16 rate_mask;
1337 u8 is_green = lq_sta->is_green;
1338 s32 rate;
1339
1340 if (!sta->ht_cap.ht_supported)
1341 return -1;
1342
1343 IWL_DEBUG_RATE(mvm, "LQ: try to switch to SISO\n");
1344
1345 tbl->lq_type = LQ_SISO;
1346 tbl->action = 0;
1347 tbl->max_search = IWL_MAX_SEARCH;
1348 rate_mask = lq_sta->active_siso_rate;
1349
1350 if (iwl_is_ht40_tx_allowed(sta))
1351 tbl->is_ht40 = 1;
1352 else
1353 tbl->is_ht40 = 0;
1354
1355 if (is_green)
1356 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1357
1358 rs_set_expected_tpt_table(lq_sta, tbl);
1359 rate = rs_get_best_rate(mvm, lq_sta, tbl, rate_mask, index);
1360
1361 IWL_DEBUG_RATE(mvm, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1362 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1363 IWL_DEBUG_RATE(mvm,
1364 "can not switch with index %d rate mask %x\n",
1365 rate, rate_mask);
1366 return -1;
1367 }
1368 tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, rate, is_green);
1369 IWL_DEBUG_RATE(mvm, "LQ: Switch to new mcs %X index is green %X\n",
1370 tbl->current_rate, is_green);
1371 return 0;
1372 }
1373
1374 /*
1375 * Try to switch to new modulation mode from legacy
1376 */
1377 static int rs_move_legacy_other(struct iwl_mvm *mvm,
1378 struct iwl_lq_sta *lq_sta,
1379 struct ieee80211_sta *sta,
1380 int index)
1381 {
1382 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1383 struct iwl_scale_tbl_info *search_tbl =
1384 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1385 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1386 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1387 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1388 u8 start_action;
1389 u8 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
1390 u8 tx_chains_num = num_of_ant(valid_tx_ant);
1391 int ret;
1392 u8 update_search_tbl_counter = 0;
1393
1394 start_action = tbl->action;
1395 while (1) {
1396 lq_sta->action_counter++;
1397 switch (tbl->action) {
1398 case IWL_LEGACY_SWITCH_ANTENNA1:
1399 case IWL_LEGACY_SWITCH_ANTENNA2:
1400 IWL_DEBUG_RATE(mvm, "LQ: Legacy toggle Antenna\n");
1401
1402 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1403 tx_chains_num <= 1) ||
1404 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1405 tx_chains_num <= 2))
1406 break;
1407
1408 /* Don't change antenna if success has been great */
1409 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1410 break;
1411
1412 /* Set up search table to try other antenna */
1413 memcpy(search_tbl, tbl, sz);
1414
1415 if (rs_toggle_antenna(valid_tx_ant,
1416 &search_tbl->current_rate,
1417 search_tbl)) {
1418 update_search_tbl_counter = 1;
1419 rs_set_expected_tpt_table(lq_sta, search_tbl);
1420 goto out;
1421 }
1422 break;
1423 case IWL_LEGACY_SWITCH_SISO:
1424 IWL_DEBUG_RATE(mvm, "LQ: Legacy switch to SISO\n");
1425
1426 /* Set up search table to try SISO */
1427 memcpy(search_tbl, tbl, sz);
1428 search_tbl->is_SGI = 0;
1429 ret = rs_switch_to_siso(mvm, lq_sta, sta,
1430 search_tbl, index);
1431 if (!ret) {
1432 lq_sta->action_counter = 0;
1433 goto out;
1434 }
1435
1436 break;
1437 case IWL_LEGACY_SWITCH_MIMO2_AB:
1438 case IWL_LEGACY_SWITCH_MIMO2_AC:
1439 case IWL_LEGACY_SWITCH_MIMO2_BC:
1440 IWL_DEBUG_RATE(mvm, "LQ: Legacy switch to MIMO2\n");
1441
1442 /* Set up search table to try MIMO */
1443 memcpy(search_tbl, tbl, sz);
1444 search_tbl->is_SGI = 0;
1445
1446 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1447 search_tbl->ant_type = ANT_AB;
1448 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1449 search_tbl->ant_type = ANT_AC;
1450 else
1451 search_tbl->ant_type = ANT_BC;
1452
1453 if (!rs_is_valid_ant(valid_tx_ant,
1454 search_tbl->ant_type))
1455 break;
1456
1457 ret = rs_switch_to_mimo2(mvm, lq_sta, sta,
1458 search_tbl, index);
1459 if (!ret) {
1460 lq_sta->action_counter = 0;
1461 goto out;
1462 }
1463 break;
1464
1465 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1466 IWL_DEBUG_RATE(mvm, "LQ: Legacy switch to MIMO3\n");
1467
1468 /* Set up search table to try MIMO3 */
1469 memcpy(search_tbl, tbl, sz);
1470 search_tbl->is_SGI = 0;
1471
1472 search_tbl->ant_type = ANT_ABC;
1473
1474 if (!rs_is_valid_ant(valid_tx_ant,
1475 search_tbl->ant_type))
1476 break;
1477
1478 ret = rs_switch_to_mimo3(mvm, lq_sta, sta,
1479 search_tbl, index);
1480 if (!ret) {
1481 lq_sta->action_counter = 0;
1482 goto out;
1483 }
1484 break;
1485 }
1486 tbl->action++;
1487 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1488 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1489
1490 if (tbl->action == start_action)
1491 break;
1492 }
1493 search_tbl->lq_type = LQ_NONE;
1494 return 0;
1495
1496 out:
1497 lq_sta->search_better_tbl = 1;
1498 tbl->action++;
1499 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1500 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1501 if (update_search_tbl_counter)
1502 search_tbl->action = tbl->action;
1503 return 0;
1504 }
1505
1506 /*
1507 * Try to switch to new modulation mode from SISO
1508 */
1509 static int rs_move_siso_to_other(struct iwl_mvm *mvm,
1510 struct iwl_lq_sta *lq_sta,
1511 struct ieee80211_sta *sta, int index)
1512 {
1513 u8 is_green = lq_sta->is_green;
1514 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1515 struct iwl_scale_tbl_info *search_tbl =
1516 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1517 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1518 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1519 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1520 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1521 u8 start_action;
1522 u8 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
1523 u8 tx_chains_num = num_of_ant(valid_tx_ant);
1524 u8 update_search_tbl_counter = 0;
1525 int ret;
1526
1527 switch (BT_MBOX_MSG(&mvm->last_bt_notif, 3, TRAFFIC_LOAD)) {
1528 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1529 /* nothing */
1530 break;
1531 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1532 /* avoid antenna B unless MIMO */
1533 if (tbl->action == IWL_SISO_SWITCH_ANTENNA2)
1534 tbl->action = IWL_SISO_SWITCH_MIMO2_AB;
1535 break;
1536 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1537 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1538 /* avoid antenna B and MIMO */
1539 valid_tx_ant =
1540 first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
1541 if (tbl->action != IWL_SISO_SWITCH_ANTENNA1)
1542 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1543 break;
1544 default:
1545 IWL_ERR(mvm, "Invalid BT load %d",
1546 BT_MBOX_MSG(&mvm->last_bt_notif, 3, TRAFFIC_LOAD));
1547 break;
1548 }
1549
1550 start_action = tbl->action;
1551 while (1) {
1552 lq_sta->action_counter++;
1553 switch (tbl->action) {
1554 case IWL_SISO_SWITCH_ANTENNA1:
1555 case IWL_SISO_SWITCH_ANTENNA2:
1556 IWL_DEBUG_RATE(mvm, "LQ: SISO toggle Antenna\n");
1557 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1558 tx_chains_num <= 1) ||
1559 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1560 tx_chains_num <= 2))
1561 break;
1562
1563 if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1564 BT_MBOX_MSG(&mvm->last_bt_notif, 3,
1565 TRAFFIC_LOAD) == 0)
1566 break;
1567
1568 memcpy(search_tbl, tbl, sz);
1569 if (rs_toggle_antenna(valid_tx_ant,
1570 &search_tbl->current_rate,
1571 search_tbl)) {
1572 update_search_tbl_counter = 1;
1573 goto out;
1574 }
1575 break;
1576 case IWL_SISO_SWITCH_MIMO2_AB:
1577 case IWL_SISO_SWITCH_MIMO2_AC:
1578 case IWL_SISO_SWITCH_MIMO2_BC:
1579 IWL_DEBUG_RATE(mvm, "LQ: SISO switch to MIMO2\n");
1580 memcpy(search_tbl, tbl, sz);
1581 search_tbl->is_SGI = 0;
1582
1583 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1584 search_tbl->ant_type = ANT_AB;
1585 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1586 search_tbl->ant_type = ANT_AC;
1587 else
1588 search_tbl->ant_type = ANT_BC;
1589
1590 if (!rs_is_valid_ant(valid_tx_ant,
1591 search_tbl->ant_type))
1592 break;
1593
1594 ret = rs_switch_to_mimo2(mvm, lq_sta, sta,
1595 search_tbl, index);
1596 if (!ret)
1597 goto out;
1598 break;
1599 case IWL_SISO_SWITCH_GI:
1600 if (!tbl->is_ht40 && !(ht_cap->cap &
1601 IEEE80211_HT_CAP_SGI_20))
1602 break;
1603 if (tbl->is_ht40 && !(ht_cap->cap &
1604 IEEE80211_HT_CAP_SGI_40))
1605 break;
1606
1607 IWL_DEBUG_RATE(mvm, "LQ: SISO toggle SGI/NGI\n");
1608
1609 memcpy(search_tbl, tbl, sz);
1610 if (is_green) {
1611 if (!tbl->is_SGI)
1612 break;
1613 else
1614 IWL_ERR(mvm,
1615 "SGI was set in GF+SISO\n");
1616 }
1617 search_tbl->is_SGI = !tbl->is_SGI;
1618 rs_set_expected_tpt_table(lq_sta, search_tbl);
1619 if (tbl->is_SGI) {
1620 s32 tpt = lq_sta->last_tpt / 100;
1621 if (tpt >= search_tbl->expected_tpt[index])
1622 break;
1623 }
1624 search_tbl->current_rate =
1625 rate_n_flags_from_tbl(mvm, search_tbl,
1626 index, is_green);
1627 update_search_tbl_counter = 1;
1628 goto out;
1629 case IWL_SISO_SWITCH_MIMO3_ABC:
1630 IWL_DEBUG_RATE(mvm, "LQ: SISO switch to MIMO3\n");
1631 memcpy(search_tbl, tbl, sz);
1632 search_tbl->is_SGI = 0;
1633 search_tbl->ant_type = ANT_ABC;
1634
1635 if (!rs_is_valid_ant(valid_tx_ant,
1636 search_tbl->ant_type))
1637 break;
1638
1639 ret = rs_switch_to_mimo3(mvm, lq_sta, sta,
1640 search_tbl, index);
1641 if (!ret)
1642 goto out;
1643 break;
1644 }
1645 tbl->action++;
1646 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1647 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1648
1649 if (tbl->action == start_action)
1650 break;
1651 }
1652 search_tbl->lq_type = LQ_NONE;
1653 return 0;
1654
1655 out:
1656 lq_sta->search_better_tbl = 1;
1657 tbl->action++;
1658 if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1659 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1660 if (update_search_tbl_counter)
1661 search_tbl->action = tbl->action;
1662
1663 return 0;
1664 }
1665
1666 /*
1667 * Try to switch to new modulation mode from MIMO2
1668 */
1669 static int rs_move_mimo2_to_other(struct iwl_mvm *mvm,
1670 struct iwl_lq_sta *lq_sta,
1671 struct ieee80211_sta *sta, int index)
1672 {
1673 s8 is_green = lq_sta->is_green;
1674 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1675 struct iwl_scale_tbl_info *search_tbl =
1676 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1677 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1678 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1679 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1680 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1681 u8 start_action;
1682 u8 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
1683 u8 tx_chains_num = num_of_ant(valid_tx_ant);
1684 u8 update_search_tbl_counter = 0;
1685 int ret;
1686
1687 switch (BT_MBOX_MSG(&mvm->last_bt_notif, 3, TRAFFIC_LOAD)) {
1688 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1689 /* nothing */
1690 break;
1691 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1692 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1693 /* avoid antenna B and MIMO */
1694 if (tbl->action != IWL_MIMO2_SWITCH_SISO_A)
1695 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1696 break;
1697 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1698 /* avoid antenna B unless MIMO */
1699 if (tbl->action == IWL_MIMO2_SWITCH_SISO_B ||
1700 tbl->action == IWL_MIMO2_SWITCH_SISO_C)
1701 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1702 break;
1703 default:
1704 IWL_ERR(mvm, "Invalid BT load %d",
1705 BT_MBOX_MSG(&mvm->last_bt_notif, 3, TRAFFIC_LOAD));
1706 break;
1707 }
1708
1709 start_action = tbl->action;
1710 while (1) {
1711 lq_sta->action_counter++;
1712 switch (tbl->action) {
1713 case IWL_MIMO2_SWITCH_ANTENNA1:
1714 case IWL_MIMO2_SWITCH_ANTENNA2:
1715 IWL_DEBUG_RATE(mvm, "LQ: MIMO2 toggle Antennas\n");
1716
1717 if (tx_chains_num <= 2)
1718 break;
1719
1720 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1721 break;
1722
1723 memcpy(search_tbl, tbl, sz);
1724 if (rs_toggle_antenna(valid_tx_ant,
1725 &search_tbl->current_rate,
1726 search_tbl)) {
1727 update_search_tbl_counter = 1;
1728 goto out;
1729 }
1730 break;
1731 case IWL_MIMO2_SWITCH_SISO_A:
1732 case IWL_MIMO2_SWITCH_SISO_B:
1733 case IWL_MIMO2_SWITCH_SISO_C:
1734 IWL_DEBUG_RATE(mvm, "LQ: MIMO2 switch to SISO\n");
1735
1736 /* Set up new search table for SISO */
1737 memcpy(search_tbl, tbl, sz);
1738
1739 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1740 search_tbl->ant_type = ANT_A;
1741 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1742 search_tbl->ant_type = ANT_B;
1743 else
1744 search_tbl->ant_type = ANT_C;
1745
1746 if (!rs_is_valid_ant(valid_tx_ant,
1747 search_tbl->ant_type))
1748 break;
1749
1750 ret = rs_switch_to_siso(mvm, lq_sta, sta,
1751 search_tbl, index);
1752 if (!ret)
1753 goto out;
1754
1755 break;
1756
1757 case IWL_MIMO2_SWITCH_GI:
1758 if (!tbl->is_ht40 && !(ht_cap->cap &
1759 IEEE80211_HT_CAP_SGI_20))
1760 break;
1761 if (tbl->is_ht40 && !(ht_cap->cap &
1762 IEEE80211_HT_CAP_SGI_40))
1763 break;
1764
1765 IWL_DEBUG_RATE(mvm, "LQ: MIMO2 toggle SGI/NGI\n");
1766
1767 /* Set up new search table for MIMO2 */
1768 memcpy(search_tbl, tbl, sz);
1769 search_tbl->is_SGI = !tbl->is_SGI;
1770 rs_set_expected_tpt_table(lq_sta, search_tbl);
1771 /*
1772 * If active table already uses the fastest possible
1773 * modulation (dual stream with short guard interval),
1774 * and it's working well, there's no need to look
1775 * for a better type of modulation!
1776 */
1777 if (tbl->is_SGI) {
1778 s32 tpt = lq_sta->last_tpt / 100;
1779 if (tpt >= search_tbl->expected_tpt[index])
1780 break;
1781 }
1782 search_tbl->current_rate =
1783 rate_n_flags_from_tbl(mvm, search_tbl,
1784 index, is_green);
1785 update_search_tbl_counter = 1;
1786 goto out;
1787
1788 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1789 IWL_DEBUG_RATE(mvm, "LQ: MIMO2 switch to MIMO3\n");
1790 memcpy(search_tbl, tbl, sz);
1791 search_tbl->is_SGI = 0;
1792 search_tbl->ant_type = ANT_ABC;
1793
1794 if (!rs_is_valid_ant(valid_tx_ant,
1795 search_tbl->ant_type))
1796 break;
1797
1798 ret = rs_switch_to_mimo3(mvm, lq_sta, sta,
1799 search_tbl, index);
1800 if (!ret)
1801 goto out;
1802
1803 break;
1804 }
1805 tbl->action++;
1806 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1807 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1808
1809 if (tbl->action == start_action)
1810 break;
1811 }
1812 search_tbl->lq_type = LQ_NONE;
1813 return 0;
1814 out:
1815 lq_sta->search_better_tbl = 1;
1816 tbl->action++;
1817 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1818 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1819 if (update_search_tbl_counter)
1820 search_tbl->action = tbl->action;
1821
1822 return 0;
1823 }
1824
1825 /*
1826 * Try to switch to new modulation mode from MIMO3
1827 */
1828 static int rs_move_mimo3_to_other(struct iwl_mvm *mvm,
1829 struct iwl_lq_sta *lq_sta,
1830 struct ieee80211_sta *sta, int index)
1831 {
1832 s8 is_green = lq_sta->is_green;
1833 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1834 struct iwl_scale_tbl_info *search_tbl =
1835 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1836 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1837 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1838 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1839 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1840 u8 start_action;
1841 u8 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
1842 u8 tx_chains_num = num_of_ant(valid_tx_ant);
1843 int ret;
1844 u8 update_search_tbl_counter = 0;
1845
1846 switch (BT_MBOX_MSG(&mvm->last_bt_notif, 3, TRAFFIC_LOAD)) {
1847 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1848 /* nothing */
1849 break;
1850 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1851 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1852 /* avoid antenna B and MIMO */
1853 if (tbl->action != IWL_MIMO3_SWITCH_SISO_A)
1854 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1855 break;
1856 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1857 /* avoid antenna B unless MIMO */
1858 if (tbl->action == IWL_MIMO3_SWITCH_SISO_B ||
1859 tbl->action == IWL_MIMO3_SWITCH_SISO_C)
1860 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1861 break;
1862 default:
1863 IWL_ERR(mvm, "Invalid BT load %d",
1864 BT_MBOX_MSG(&mvm->last_bt_notif, 3, TRAFFIC_LOAD));
1865 break;
1866 }
1867
1868 start_action = tbl->action;
1869 while (1) {
1870 lq_sta->action_counter++;
1871 switch (tbl->action) {
1872 case IWL_MIMO3_SWITCH_ANTENNA1:
1873 case IWL_MIMO3_SWITCH_ANTENNA2:
1874 IWL_DEBUG_RATE(mvm, "LQ: MIMO3 toggle Antennas\n");
1875
1876 if (tx_chains_num <= 3)
1877 break;
1878
1879 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1880 break;
1881
1882 memcpy(search_tbl, tbl, sz);
1883 if (rs_toggle_antenna(valid_tx_ant,
1884 &search_tbl->current_rate,
1885 search_tbl))
1886 goto out;
1887 break;
1888 case IWL_MIMO3_SWITCH_SISO_A:
1889 case IWL_MIMO3_SWITCH_SISO_B:
1890 case IWL_MIMO3_SWITCH_SISO_C:
1891 IWL_DEBUG_RATE(mvm, "LQ: MIMO3 switch to SISO\n");
1892
1893 /* Set up new search table for SISO */
1894 memcpy(search_tbl, tbl, sz);
1895
1896 if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
1897 search_tbl->ant_type = ANT_A;
1898 else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
1899 search_tbl->ant_type = ANT_B;
1900 else
1901 search_tbl->ant_type = ANT_C;
1902
1903 if (!rs_is_valid_ant(valid_tx_ant,
1904 search_tbl->ant_type))
1905 break;
1906
1907 ret = rs_switch_to_siso(mvm, lq_sta, sta,
1908 search_tbl, index);
1909 if (!ret)
1910 goto out;
1911
1912 break;
1913
1914 case IWL_MIMO3_SWITCH_MIMO2_AB:
1915 case IWL_MIMO3_SWITCH_MIMO2_AC:
1916 case IWL_MIMO3_SWITCH_MIMO2_BC:
1917 IWL_DEBUG_RATE(mvm, "LQ: MIMO3 switch to MIMO2\n");
1918
1919 memcpy(search_tbl, tbl, sz);
1920 search_tbl->is_SGI = 0;
1921 if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
1922 search_tbl->ant_type = ANT_AB;
1923 else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
1924 search_tbl->ant_type = ANT_AC;
1925 else
1926 search_tbl->ant_type = ANT_BC;
1927
1928 if (!rs_is_valid_ant(valid_tx_ant,
1929 search_tbl->ant_type))
1930 break;
1931
1932 ret = rs_switch_to_mimo2(mvm, lq_sta, sta,
1933 search_tbl, index);
1934 if (!ret)
1935 goto out;
1936
1937 break;
1938
1939 case IWL_MIMO3_SWITCH_GI:
1940 if (!tbl->is_ht40 && !(ht_cap->cap &
1941 IEEE80211_HT_CAP_SGI_20))
1942 break;
1943 if (tbl->is_ht40 && !(ht_cap->cap &
1944 IEEE80211_HT_CAP_SGI_40))
1945 break;
1946
1947 IWL_DEBUG_RATE(mvm, "LQ: MIMO3 toggle SGI/NGI\n");
1948
1949 /* Set up new search table for MIMO */
1950 memcpy(search_tbl, tbl, sz);
1951 search_tbl->is_SGI = !tbl->is_SGI;
1952 rs_set_expected_tpt_table(lq_sta, search_tbl);
1953 /*
1954 * If active table already uses the fastest possible
1955 * modulation (dual stream with short guard interval),
1956 * and it's working well, there's no need to look
1957 * for a better type of modulation!
1958 */
1959 if (tbl->is_SGI) {
1960 s32 tpt = lq_sta->last_tpt / 100;
1961 if (tpt >= search_tbl->expected_tpt[index])
1962 break;
1963 }
1964 search_tbl->current_rate =
1965 rate_n_flags_from_tbl(mvm, search_tbl,
1966 index, is_green);
1967 update_search_tbl_counter = 1;
1968 goto out;
1969 }
1970 tbl->action++;
1971 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1972 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1973
1974 if (tbl->action == start_action)
1975 break;
1976 }
1977 search_tbl->lq_type = LQ_NONE;
1978 return 0;
1979 out:
1980 lq_sta->search_better_tbl = 1;
1981 tbl->action++;
1982 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1983 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1984 if (update_search_tbl_counter)
1985 search_tbl->action = tbl->action;
1986
1987 return 0;
1988 }
1989
1990 /*
1991 * Check whether we should continue using same modulation mode, or
1992 * begin search for a new mode, based on:
1993 * 1) # tx successes or failures while using this mode
1994 * 2) # times calling this function
1995 * 3) elapsed time in this mode (not used, for now)
1996 */
1997 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1998 {
1999 struct iwl_scale_tbl_info *tbl;
2000 int i;
2001 int active_tbl;
2002 int flush_interval_passed = 0;
2003 struct iwl_mvm *mvm;
2004
2005 mvm = lq_sta->drv;
2006 active_tbl = lq_sta->active_tbl;
2007
2008 tbl = &(lq_sta->lq_info[active_tbl]);
2009
2010 /* If we've been disallowing search, see if we should now allow it */
2011 if (lq_sta->stay_in_tbl) {
2012 /* Elapsed time using current modulation mode */
2013 if (lq_sta->flush_timer)
2014 flush_interval_passed =
2015 time_after(jiffies,
2016 (unsigned long)(lq_sta->flush_timer +
2017 IWL_RATE_SCALE_FLUSH_INTVL));
2018
2019 /*
2020 * Check if we should allow search for new modulation mode.
2021 * If many frames have failed or succeeded, or we've used
2022 * this same modulation for a long time, allow search, and
2023 * reset history stats that keep track of whether we should
2024 * allow a new search. Also (below) reset all bitmaps and
2025 * stats in active history.
2026 */
2027 if (force_search ||
2028 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
2029 (lq_sta->total_success > lq_sta->max_success_limit) ||
2030 ((!lq_sta->search_better_tbl) &&
2031 (lq_sta->flush_timer) && (flush_interval_passed))) {
2032 IWL_DEBUG_RATE(mvm,
2033 "LQ: stay is expired %d %d %d\n",
2034 lq_sta->total_failed,
2035 lq_sta->total_success,
2036 flush_interval_passed);
2037
2038 /* Allow search for new mode */
2039 lq_sta->stay_in_tbl = 0; /* only place reset */
2040 lq_sta->total_failed = 0;
2041 lq_sta->total_success = 0;
2042 lq_sta->flush_timer = 0;
2043 /*
2044 * Else if we've used this modulation mode enough repetitions
2045 * (regardless of elapsed time or success/failure), reset
2046 * history bitmaps and rate-specific stats for all rates in
2047 * active table.
2048 */
2049 } else {
2050 lq_sta->table_count++;
2051 if (lq_sta->table_count >=
2052 lq_sta->table_count_limit) {
2053 lq_sta->table_count = 0;
2054
2055 IWL_DEBUG_RATE(mvm,
2056 "LQ: stay in table clear win\n");
2057 for (i = 0; i < IWL_RATE_COUNT; i++)
2058 rs_rate_scale_clear_window(
2059 &(tbl->win[i]));
2060 }
2061 }
2062
2063 /* If transitioning to allow "search", reset all history
2064 * bitmaps and stats in active table (this will become the new
2065 * "search" table). */
2066 if (!lq_sta->stay_in_tbl) {
2067 for (i = 0; i < IWL_RATE_COUNT; i++)
2068 rs_rate_scale_clear_window(&(tbl->win[i]));
2069 }
2070 }
2071 }
2072
2073 /*
2074 * setup rate table in uCode
2075 */
2076 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
2077 struct iwl_lq_sta *lq_sta,
2078 struct iwl_scale_tbl_info *tbl,
2079 int index, u8 is_green)
2080 {
2081 u32 rate;
2082
2083 /* Update uCode's rate table. */
2084 rate = rate_n_flags_from_tbl(mvm, tbl, index, is_green);
2085 rs_fill_link_cmd(mvm, lq_sta, rate);
2086 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, CMD_ASYNC, false);
2087 }
2088
2089 /*
2090 * Do rate scaling and search for new modulation mode.
2091 */
2092 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2093 struct sk_buff *skb,
2094 struct ieee80211_sta *sta,
2095 struct iwl_lq_sta *lq_sta)
2096 {
2097 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2098 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2099 int low = IWL_RATE_INVALID;
2100 int high = IWL_RATE_INVALID;
2101 int index;
2102 int i;
2103 struct iwl_rate_scale_data *window = NULL;
2104 int current_tpt = IWL_INVALID_VALUE;
2105 int low_tpt = IWL_INVALID_VALUE;
2106 int high_tpt = IWL_INVALID_VALUE;
2107 u32 fail_count;
2108 s8 scale_action = 0;
2109 u16 rate_mask;
2110 u8 update_lq = 0;
2111 struct iwl_scale_tbl_info *tbl, *tbl1;
2112 u16 rate_scale_index_msk = 0;
2113 u8 is_green = 0;
2114 u8 active_tbl = 0;
2115 u8 done_search = 0;
2116 u16 high_low;
2117 s32 sr;
2118 u8 tid = IWL_MAX_TID_COUNT;
2119 struct iwl_mvm_sta *sta_priv = (void *)sta->drv_priv;
2120 struct iwl_mvm_tid_data *tid_data;
2121
2122 IWL_DEBUG_RATE(mvm, "rate scale calculate new rate for skb\n");
2123
2124 /* Send management frames and NO_ACK data using lowest rate. */
2125 /* TODO: this could probably be improved.. */
2126 if (!ieee80211_is_data(hdr->frame_control) ||
2127 info->flags & IEEE80211_TX_CTL_NO_ACK)
2128 return;
2129
2130 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
2131
2132 tid = rs_tl_add_packet(lq_sta, hdr);
2133 if ((tid != IWL_MAX_TID_COUNT) &&
2134 (lq_sta->tx_agg_tid_en & (1 << tid))) {
2135 tid_data = &sta_priv->tid_data[tid];
2136 if (tid_data->state == IWL_AGG_OFF)
2137 lq_sta->is_agg = 0;
2138 else
2139 lq_sta->is_agg = 1;
2140 } else {
2141 lq_sta->is_agg = 0;
2142 }
2143
2144 /*
2145 * Select rate-scale / modulation-mode table to work with in
2146 * the rest of this function: "search" if searching for better
2147 * modulation mode, or "active" if doing rate scaling within a mode.
2148 */
2149 if (!lq_sta->search_better_tbl)
2150 active_tbl = lq_sta->active_tbl;
2151 else
2152 active_tbl = 1 - lq_sta->active_tbl;
2153
2154 tbl = &(lq_sta->lq_info[active_tbl]);
2155 if (is_legacy(tbl->lq_type))
2156 lq_sta->is_green = 0;
2157 else
2158 lq_sta->is_green = rs_use_green(sta);
2159 is_green = lq_sta->is_green;
2160
2161 /* current tx rate */
2162 index = lq_sta->last_txrate_idx;
2163
2164 IWL_DEBUG_RATE(mvm, "Rate scale index %d for type %d\n", index,
2165 tbl->lq_type);
2166
2167 /* rates available for this association, and for modulation mode */
2168 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2169
2170 IWL_DEBUG_RATE(mvm, "mask 0x%04X\n", rate_mask);
2171
2172 /* mask with station rate restriction */
2173 if (is_legacy(tbl->lq_type)) {
2174 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2175 /* supp_rates has no CCK bits in A mode */
2176 rate_scale_index_msk = (u16) (rate_mask &
2177 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2178 else
2179 rate_scale_index_msk = (u16) (rate_mask &
2180 lq_sta->supp_rates);
2181
2182 } else {
2183 rate_scale_index_msk = rate_mask;
2184 }
2185
2186 if (!rate_scale_index_msk)
2187 rate_scale_index_msk = rate_mask;
2188
2189 if (!((1 << index) & rate_scale_index_msk)) {
2190 IWL_ERR(mvm, "Current Rate is not valid\n");
2191 if (lq_sta->search_better_tbl) {
2192 /* revert to active table if search table is not valid*/
2193 tbl->lq_type = LQ_NONE;
2194 lq_sta->search_better_tbl = 0;
2195 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2196 /* get "active" rate info */
2197 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2198 rs_update_rate_tbl(mvm, lq_sta, tbl, index, is_green);
2199 }
2200 return;
2201 }
2202
2203 /* Get expected throughput table and history window for current rate */
2204 if (!tbl->expected_tpt) {
2205 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2206 return;
2207 }
2208
2209 /* force user max rate if set by user */
2210 if ((lq_sta->max_rate_idx != -1) &&
2211 (lq_sta->max_rate_idx < index)) {
2212 index = lq_sta->max_rate_idx;
2213 update_lq = 1;
2214 window = &(tbl->win[index]);
2215 goto lq_update;
2216 }
2217
2218 window = &(tbl->win[index]);
2219
2220 /*
2221 * If there is not enough history to calculate actual average
2222 * throughput, keep analyzing results of more tx frames, without
2223 * changing rate or mode (bypass most of the rest of this function).
2224 * Set up new rate table in uCode only if old rate is not supported
2225 * in current association (use new rate found above).
2226 */
2227 fail_count = window->counter - window->success_counter;
2228 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2229 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2230 IWL_DEBUG_RATE(mvm,
2231 "LQ: still below TH. succ=%d total=%d for index %d\n",
2232 window->success_counter, window->counter, index);
2233
2234 /* Can't calculate this yet; not enough history */
2235 window->average_tpt = IWL_INVALID_VALUE;
2236
2237 /* Should we stay with this modulation mode,
2238 * or search for a new one? */
2239 rs_stay_in_table(lq_sta, false);
2240
2241 goto out;
2242 }
2243 /* Else we have enough samples; calculate estimate of
2244 * actual average throughput */
2245 if (window->average_tpt != ((window->success_ratio *
2246 tbl->expected_tpt[index] + 64) / 128)) {
2247 IWL_ERR(mvm,
2248 "expected_tpt should have been calculated by now\n");
2249 window->average_tpt = ((window->success_ratio *
2250 tbl->expected_tpt[index] + 64) / 128);
2251 }
2252
2253 /* If we are searching for better modulation mode, check success. */
2254 if (lq_sta->search_better_tbl) {
2255 /* If good success, continue using the "search" mode;
2256 * no need to send new link quality command, since we're
2257 * continuing to use the setup that we've been trying. */
2258 if (window->average_tpt > lq_sta->last_tpt) {
2259 IWL_DEBUG_RATE(mvm,
2260 "LQ: SWITCHING TO NEW TABLE suc=%d cur-tpt=%d old-tpt=%d\n",
2261 window->success_ratio,
2262 window->average_tpt,
2263 lq_sta->last_tpt);
2264
2265 if (!is_legacy(tbl->lq_type))
2266 lq_sta->enable_counter = 1;
2267
2268 /* Swap tables; "search" becomes "active" */
2269 lq_sta->active_tbl = active_tbl;
2270 current_tpt = window->average_tpt;
2271 /* Else poor success; go back to mode in "active" table */
2272 } else {
2273 IWL_DEBUG_RATE(mvm,
2274 "LQ: GOING BACK TO THE OLD TABLE suc=%d cur-tpt=%d old-tpt=%d\n",
2275 window->success_ratio,
2276 window->average_tpt,
2277 lq_sta->last_tpt);
2278
2279 /* Nullify "search" table */
2280 tbl->lq_type = LQ_NONE;
2281
2282 /* Revert to "active" table */
2283 active_tbl = lq_sta->active_tbl;
2284 tbl = &(lq_sta->lq_info[active_tbl]);
2285
2286 /* Revert to "active" rate and throughput info */
2287 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2288 current_tpt = lq_sta->last_tpt;
2289
2290 /* Need to set up a new rate table in uCode */
2291 update_lq = 1;
2292 }
2293
2294 /* Either way, we've made a decision; modulation mode
2295 * search is done, allow rate adjustment next time. */
2296 lq_sta->search_better_tbl = 0;
2297 done_search = 1; /* Don't switch modes below! */
2298 goto lq_update;
2299 }
2300
2301 /* (Else) not in search of better modulation mode, try for better
2302 * starting rate, while staying in this mode. */
2303 high_low = rs_get_adjacent_rate(mvm, index, rate_scale_index_msk,
2304 tbl->lq_type);
2305 low = high_low & 0xff;
2306 high = (high_low >> 8) & 0xff;
2307
2308 /* If user set max rate, dont allow higher than user constrain */
2309 if ((lq_sta->max_rate_idx != -1) &&
2310 (lq_sta->max_rate_idx < high))
2311 high = IWL_RATE_INVALID;
2312
2313 sr = window->success_ratio;
2314
2315 /* Collect measured throughputs for current and adjacent rates */
2316 current_tpt = window->average_tpt;
2317 if (low != IWL_RATE_INVALID)
2318 low_tpt = tbl->win[low].average_tpt;
2319 if (high != IWL_RATE_INVALID)
2320 high_tpt = tbl->win[high].average_tpt;
2321
2322 scale_action = 0;
2323
2324 /* Too many failures, decrease rate */
2325 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2326 IWL_DEBUG_RATE(mvm,
2327 "decrease rate because of low success_ratio\n");
2328 scale_action = -1;
2329 /* No throughput measured yet for adjacent rates; try increase. */
2330 } else if ((low_tpt == IWL_INVALID_VALUE) &&
2331 (high_tpt == IWL_INVALID_VALUE)) {
2332 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2333 scale_action = 1;
2334 else if (low != IWL_RATE_INVALID)
2335 scale_action = 0;
2336 }
2337
2338 /* Both adjacent throughputs are measured, but neither one has better
2339 * throughput; we're using the best rate, don't change it! */
2340 else if ((low_tpt != IWL_INVALID_VALUE) &&
2341 (high_tpt != IWL_INVALID_VALUE) &&
2342 (low_tpt < current_tpt) &&
2343 (high_tpt < current_tpt))
2344 scale_action = 0;
2345
2346 /* At least one adjacent rate's throughput is measured,
2347 * and may have better performance. */
2348 else {
2349 /* Higher adjacent rate's throughput is measured */
2350 if (high_tpt != IWL_INVALID_VALUE) {
2351 /* Higher rate has better throughput */
2352 if (high_tpt > current_tpt &&
2353 sr >= IWL_RATE_INCREASE_TH) {
2354 scale_action = 1;
2355 } else {
2356 scale_action = 0;
2357 }
2358
2359 /* Lower adjacent rate's throughput is measured */
2360 } else if (low_tpt != IWL_INVALID_VALUE) {
2361 /* Lower rate has better throughput */
2362 if (low_tpt > current_tpt) {
2363 IWL_DEBUG_RATE(mvm,
2364 "decrease rate because of low tpt\n");
2365 scale_action = -1;
2366 } else if (sr >= IWL_RATE_INCREASE_TH) {
2367 scale_action = 1;
2368 }
2369 }
2370 }
2371
2372 /* Sanity check; asked for decrease, but success rate or throughput
2373 * has been good at old rate. Don't change it. */
2374 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2375 ((sr > IWL_RATE_HIGH_TH) ||
2376 (current_tpt > (100 * tbl->expected_tpt[low]))))
2377 scale_action = 0;
2378
2379 if ((BT_MBOX_MSG(&mvm->last_bt_notif, 3, TRAFFIC_LOAD) >=
2380 IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2381 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2382 if (lq_sta->last_bt_traffic >
2383 BT_MBOX_MSG(&mvm->last_bt_notif, 3, TRAFFIC_LOAD)) {
2384 /*
2385 * don't set scale_action, don't want to scale up if
2386 * the rate scale doesn't otherwise think that is a
2387 * good idea.
2388 */
2389 } else if (lq_sta->last_bt_traffic <=
2390 BT_MBOX_MSG(&mvm->last_bt_notif, 3, TRAFFIC_LOAD)) {
2391 scale_action = -1;
2392 }
2393 }
2394 lq_sta->last_bt_traffic =
2395 BT_MBOX_MSG(&mvm->last_bt_notif, 3, TRAFFIC_LOAD);
2396
2397 if ((BT_MBOX_MSG(&mvm->last_bt_notif, 3, TRAFFIC_LOAD) >=
2398 IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2399 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2400 /* search for a new modulation */
2401 rs_stay_in_table(lq_sta, true);
2402 goto lq_update;
2403 }
2404
2405 switch (scale_action) {
2406 case -1:
2407 /* Decrease starting rate, update uCode's rate table */
2408 if (low != IWL_RATE_INVALID) {
2409 update_lq = 1;
2410 index = low;
2411 }
2412
2413 break;
2414 case 1:
2415 /* Increase starting rate, update uCode's rate table */
2416 if (high != IWL_RATE_INVALID) {
2417 update_lq = 1;
2418 index = high;
2419 }
2420
2421 break;
2422 case 0:
2423 /* No change */
2424 default:
2425 break;
2426 }
2427
2428 IWL_DEBUG_RATE(mvm,
2429 "choose rate scale index %d action %d low %d high %d type %d\n",
2430 index, scale_action, low, high, tbl->lq_type);
2431
2432 lq_update:
2433 /* Replace uCode's rate table for the destination station. */
2434 if (update_lq)
2435 rs_update_rate_tbl(mvm, lq_sta, tbl, index, is_green);
2436
2437 rs_stay_in_table(lq_sta, false);
2438
2439 /*
2440 * Search for new modulation mode if we're:
2441 * 1) Not changing rates right now
2442 * 2) Not just finishing up a search
2443 * 3) Allowing a new search
2444 */
2445 if (!update_lq && !done_search &&
2446 !lq_sta->stay_in_tbl && window->counter) {
2447 /* Save current throughput to compare with "search" throughput*/
2448 lq_sta->last_tpt = current_tpt;
2449
2450 /* Select a new "search" modulation mode to try.
2451 * If one is found, set up the new "search" table. */
2452 if (is_legacy(tbl->lq_type))
2453 rs_move_legacy_other(mvm, lq_sta, sta, index);
2454 else if (is_siso(tbl->lq_type))
2455 rs_move_siso_to_other(mvm, lq_sta, sta, index);
2456 else if (is_mimo2(tbl->lq_type))
2457 rs_move_mimo2_to_other(mvm, lq_sta, sta, index);
2458 else
2459 rs_move_mimo3_to_other(mvm, lq_sta, sta, index);
2460
2461 /* If new "search" mode was selected, set up in uCode table */
2462 if (lq_sta->search_better_tbl) {
2463 /* Access the "search" table, clear its history. */
2464 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2465 for (i = 0; i < IWL_RATE_COUNT; i++)
2466 rs_rate_scale_clear_window(&(tbl->win[i]));
2467
2468 /* Use new "search" start rate */
2469 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2470
2471 IWL_DEBUG_RATE(mvm,
2472 "Switch current mcs: %X index: %d\n",
2473 tbl->current_rate, index);
2474 rs_fill_link_cmd(mvm, lq_sta, tbl->current_rate);
2475 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, CMD_ASYNC, false);
2476 } else {
2477 done_search = 1;
2478 }
2479 }
2480
2481 if (done_search && !lq_sta->stay_in_tbl) {
2482 /* If the "active" (non-search) mode was legacy,
2483 * and we've tried switching antennas,
2484 * but we haven't been able to try HT modes (not available),
2485 * stay with best antenna legacy modulation for a while
2486 * before next round of mode comparisons. */
2487 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2488 if (is_legacy(tbl1->lq_type) && !sta->ht_cap.ht_supported &&
2489 lq_sta->action_counter > tbl1->max_search) {
2490 IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2491 rs_set_stay_in_table(mvm, 1, lq_sta);
2492 }
2493
2494 /* If we're in an HT mode, and all 3 mode switch actions
2495 * have been tried and compared, stay in this best modulation
2496 * mode for a while before next round of mode comparisons. */
2497 if (lq_sta->enable_counter &&
2498 (lq_sta->action_counter >= tbl1->max_search)) {
2499 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2500 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2501 (tid != IWL_MAX_TID_COUNT)) {
2502 tid_data = &sta_priv->tid_data[tid];
2503 if (tid_data->state == IWL_AGG_OFF) {
2504 IWL_DEBUG_RATE(mvm,
2505 "try to aggregate tid %d\n",
2506 tid);
2507 rs_tl_turn_on_agg(mvm, tid,
2508 lq_sta, sta);
2509 }
2510 }
2511 rs_set_stay_in_table(mvm, 0, lq_sta);
2512 }
2513 }
2514
2515 out:
2516 tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, index, is_green);
2517 lq_sta->last_txrate_idx = index;
2518 }
2519
2520 /**
2521 * rs_initialize_lq - Initialize a station's hardware rate table
2522 *
2523 * The uCode's station table contains a table of fallback rates
2524 * for automatic fallback during transmission.
2525 *
2526 * NOTE: This sets up a default set of values. These will be replaced later
2527 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2528 * rc80211_simple.
2529 *
2530 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2531 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2532 * which requires station table entry to exist).
2533 */
2534 static void rs_initialize_lq(struct iwl_mvm *mvm,
2535 struct ieee80211_sta *sta,
2536 struct iwl_lq_sta *lq_sta,
2537 enum ieee80211_band band)
2538 {
2539 struct iwl_scale_tbl_info *tbl;
2540 int rate_idx;
2541 int i;
2542 u32 rate;
2543 u8 use_green = rs_use_green(sta);
2544 u8 active_tbl = 0;
2545 u8 valid_tx_ant;
2546
2547 if (!sta || !lq_sta)
2548 return;
2549
2550 i = lq_sta->last_txrate_idx;
2551
2552 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
2553
2554 if (!lq_sta->search_better_tbl)
2555 active_tbl = lq_sta->active_tbl;
2556 else
2557 active_tbl = 1 - lq_sta->active_tbl;
2558
2559 tbl = &(lq_sta->lq_info[active_tbl]);
2560
2561 if ((i < 0) || (i >= IWL_RATE_COUNT))
2562 i = 0;
2563
2564 rate = iwl_rates[i].plcp;
2565 tbl->ant_type = first_antenna(valid_tx_ant);
2566 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2567
2568 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2569 rate |= RATE_MCS_CCK_MSK;
2570
2571 rs_get_tbl_info_from_mcs(rate, band, tbl, &rate_idx);
2572 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2573 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2574
2575 rate = rate_n_flags_from_tbl(mvm, tbl, rate_idx, use_green);
2576 tbl->current_rate = rate;
2577 rs_set_expected_tpt_table(lq_sta, tbl);
2578 rs_fill_link_cmd(NULL, lq_sta, rate);
2579 /* TODO restore station should remember the lq cmd */
2580 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, CMD_SYNC, true);
2581 }
2582
2583 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2584 struct ieee80211_tx_rate_control *txrc)
2585 {
2586 struct sk_buff *skb = txrc->skb;
2587 struct ieee80211_supported_band *sband = txrc->sband;
2588 struct iwl_op_mode *op_mode __maybe_unused =
2589 (struct iwl_op_mode *)mvm_r;
2590 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2591 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2592 struct iwl_lq_sta *lq_sta = mvm_sta;
2593 int rate_idx;
2594
2595 IWL_DEBUG_RATE_LIMIT(mvm, "rate scale calculate new rate for skb\n");
2596
2597 /* Get max rate if user set max rate */
2598 if (lq_sta) {
2599 lq_sta->max_rate_idx = txrc->max_rate_idx;
2600 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2601 (lq_sta->max_rate_idx != -1))
2602 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2603 if ((lq_sta->max_rate_idx < 0) ||
2604 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2605 lq_sta->max_rate_idx = -1;
2606 }
2607
2608 /* Treat uninitialized rate scaling data same as non-existing. */
2609 if (lq_sta && !lq_sta->drv) {
2610 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2611 mvm_sta = NULL;
2612 }
2613
2614 /* Send management frames and NO_ACK data using lowest rate. */
2615 if (rate_control_send_low(sta, mvm_sta, txrc))
2616 return;
2617
2618 rate_idx = lq_sta->last_txrate_idx;
2619
2620 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2621 rate_idx -= IWL_FIRST_OFDM_RATE;
2622 /* 6M and 9M shared same MCS index */
2623 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2624 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2625 IWL_RATE_MIMO3_6M_PLCP)
2626 rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2627 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2628 IWL_RATE_MIMO2_6M_PLCP)
2629 rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2630 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2631 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2632 info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2633 if (lq_sta->last_rate_n_flags & RATE_MCS_CHAN_WIDTH_40) /* TODO */
2634 info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2635 if (lq_sta->last_rate_n_flags & RATE_HT_MCS_GF_MSK)
2636 info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2637 } else {
2638 /* Check for invalid rates */
2639 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2640 ((sband->band == IEEE80211_BAND_5GHZ) &&
2641 (rate_idx < IWL_FIRST_OFDM_RATE)))
2642 rate_idx = rate_lowest_index(sband, sta);
2643 /* On valid 5 GHz rate, adjust index */
2644 else if (sband->band == IEEE80211_BAND_5GHZ)
2645 rate_idx -= IWL_FIRST_OFDM_RATE;
2646 info->control.rates[0].flags = 0;
2647 }
2648 info->control.rates[0].idx = rate_idx;
2649 info->control.rates[0].count = 1;
2650 }
2651
2652 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2653 gfp_t gfp)
2654 {
2655 struct iwl_mvm_sta *sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2656 struct iwl_op_mode *op_mode __maybe_unused =
2657 (struct iwl_op_mode *)mvm_rate;
2658 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2659
2660 IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2661
2662 return &sta_priv->lq_sta;
2663 }
2664
2665 /*
2666 * Called after adding a new station to initialize rate scaling
2667 */
2668 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2669 enum ieee80211_band band)
2670 {
2671 int i, j;
2672 struct ieee80211_hw *hw = mvm->hw;
2673 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2674 struct iwl_mvm_sta *sta_priv;
2675 struct iwl_lq_sta *lq_sta;
2676 struct ieee80211_supported_band *sband;
2677 unsigned long supp; /* must be unsigned long for for_each_set_bit */
2678
2679 sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2680 lq_sta = &sta_priv->lq_sta;
2681 sband = hw->wiphy->bands[band];
2682
2683 lq_sta->lq.sta_id = sta_priv->sta_id;
2684
2685 for (j = 0; j < LQ_SIZE; j++)
2686 for (i = 0; i < IWL_RATE_COUNT; i++)
2687 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2688
2689 lq_sta->flush_timer = 0;
2690 lq_sta->supp_rates = sta->supp_rates[sband->band];
2691 for (j = 0; j < LQ_SIZE; j++)
2692 for (i = 0; i < IWL_RATE_COUNT; i++)
2693 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2694
2695 IWL_DEBUG_RATE(mvm,
2696 "LQ: *** rate scale station global init for station %d ***\n",
2697 sta_priv->sta_id);
2698 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2699 * the lowest or the highest rate.. Could consider using RSSI from
2700 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2701 * after assoc.. */
2702
2703 lq_sta->max_rate_idx = -1;
2704 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2705 lq_sta->is_green = rs_use_green(sta);
2706 lq_sta->band = sband->band;
2707 /*
2708 * active legacy rates as per supported rates bitmap
2709 */
2710 supp = sta->supp_rates[sband->band];
2711 lq_sta->active_legacy_rate = 0;
2712 for_each_set_bit(i, &supp, BITS_PER_LONG)
2713 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2714
2715 /*
2716 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2717 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2718 */
2719 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2720 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2721 lq_sta->active_siso_rate &= ~((u16)0x2);
2722 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2723
2724 /* Same here */
2725 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2726 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2727 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2728 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2729
2730 lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2731 lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2732 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2733 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2734
2735 IWL_DEBUG_RATE(mvm,
2736 "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2737 lq_sta->active_siso_rate,
2738 lq_sta->active_mimo2_rate,
2739 lq_sta->active_mimo3_rate);
2740
2741 /* These values will be overridden later */
2742 lq_sta->lq.single_stream_ant_msk =
2743 first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
2744 lq_sta->lq.dual_stream_ant_msk =
2745 iwl_fw_valid_tx_ant(mvm->fw) &
2746 ~first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
2747 if (!lq_sta->lq.dual_stream_ant_msk) {
2748 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
2749 } else if (num_of_ant(iwl_fw_valid_tx_ant(mvm->fw)) == 2) {
2750 lq_sta->lq.dual_stream_ant_msk =
2751 iwl_fw_valid_tx_ant(mvm->fw);
2752 }
2753
2754 /* as default allow aggregation for all tids */
2755 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2756 lq_sta->drv = mvm;
2757
2758 /* Set last_txrate_idx to lowest rate */
2759 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2760 if (sband->band == IEEE80211_BAND_5GHZ)
2761 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2762 lq_sta->is_agg = 0;
2763 #ifdef CONFIG_MAC80211_DEBUGFS
2764 lq_sta->dbg_fixed_rate = 0;
2765 #endif
2766
2767 rs_initialize_lq(mvm, sta, lq_sta, band);
2768 }
2769
2770 static void rs_fill_link_cmd(struct iwl_mvm *mvm,
2771 struct iwl_lq_sta *lq_sta, u32 new_rate)
2772 {
2773 struct iwl_scale_tbl_info tbl_type;
2774 int index = 0;
2775 int rate_idx;
2776 int repeat_rate = 0;
2777 u8 ant_toggle_cnt = 0;
2778 u8 use_ht_possible = 1;
2779 u8 valid_tx_ant = 0;
2780 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2781
2782 /* Override starting rate (index 0) if needed for debug purposes */
2783 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2784
2785 /* Interpret new_rate (rate_n_flags) */
2786 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2787 &tbl_type, &rate_idx);
2788
2789 /* How many times should we repeat the initial rate? */
2790 if (is_legacy(tbl_type.lq_type)) {
2791 ant_toggle_cnt = 1;
2792 repeat_rate = IWL_NUMBER_TRY;
2793 } else {
2794 repeat_rate = min(IWL_HT_NUMBER_TRY,
2795 LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2796 }
2797
2798 lq_cmd->mimo_delim = is_mimo(tbl_type.lq_type) ? 1 : 0;
2799
2800 /* Fill 1st table entry (index 0) */
2801 lq_cmd->rs_table[index] = cpu_to_le32(new_rate);
2802
2803 if (num_of_ant(tbl_type.ant_type) == 1)
2804 lq_cmd->single_stream_ant_msk = tbl_type.ant_type;
2805 else if (num_of_ant(tbl_type.ant_type) == 2)
2806 lq_cmd->dual_stream_ant_msk = tbl_type.ant_type;
2807 /* otherwise we don't modify the existing value */
2808
2809 index++;
2810 repeat_rate--;
2811 if (mvm)
2812 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
2813
2814 /* Fill rest of rate table */
2815 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2816 /* Repeat initial/next rate.
2817 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2818 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2819 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2820 if (is_legacy(tbl_type.lq_type)) {
2821 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2822 ant_toggle_cnt++;
2823 else if (mvm &&
2824 rs_toggle_antenna(valid_tx_ant,
2825 &new_rate, &tbl_type))
2826 ant_toggle_cnt = 1;
2827 }
2828
2829 /* Override next rate if needed for debug purposes */
2830 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2831
2832 /* Fill next table entry */
2833 lq_cmd->rs_table[index] =
2834 cpu_to_le32(new_rate);
2835 repeat_rate--;
2836 index++;
2837 }
2838
2839 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2840 &rate_idx);
2841
2842
2843 /* Indicate to uCode which entries might be MIMO.
2844 * If initial rate was MIMO, this will finally end up
2845 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2846 if (is_mimo(tbl_type.lq_type))
2847 lq_cmd->mimo_delim = index;
2848
2849 /* Get next rate */
2850 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2851 use_ht_possible);
2852
2853 /* How many times should we repeat the next rate? */
2854 if (is_legacy(tbl_type.lq_type)) {
2855 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2856 ant_toggle_cnt++;
2857 else if (mvm &&
2858 rs_toggle_antenna(valid_tx_ant,
2859 &new_rate, &tbl_type))
2860 ant_toggle_cnt = 1;
2861
2862 repeat_rate = IWL_NUMBER_TRY;
2863 } else {
2864 repeat_rate = IWL_HT_NUMBER_TRY;
2865 }
2866
2867 /* Don't allow HT rates after next pass.
2868 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2869 use_ht_possible = 0;
2870
2871 /* Override next rate if needed for debug purposes */
2872 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2873
2874 /* Fill next table entry */
2875 lq_cmd->rs_table[index] = cpu_to_le32(new_rate);
2876
2877 index++;
2878 repeat_rate--;
2879 }
2880
2881 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2882 lq_cmd->agg_disable_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2883
2884 lq_cmd->agg_time_limit =
2885 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2886
2887 /*
2888 * overwrite if needed, pass aggregation time limit
2889 * to uCode in uSec - This is racy - but heh, at least it helps...
2890 */
2891 if (mvm && BT_MBOX_MSG(&mvm->last_bt_notif, 3, TRAFFIC_LOAD) >= 2)
2892 lq_cmd->agg_time_limit = cpu_to_le16(1200);
2893 }
2894
2895 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2896 {
2897 return hw->priv;
2898 }
2899 /* rate scale requires free function to be implemented */
2900 static void rs_free(void *mvm_rate)
2901 {
2902 return;
2903 }
2904
2905 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
2906 void *mvm_sta)
2907 {
2908 struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
2909 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2910
2911 IWL_DEBUG_RATE(mvm, "enter\n");
2912 IWL_DEBUG_RATE(mvm, "leave\n");
2913 }
2914
2915 #ifdef CONFIG_MAC80211_DEBUGFS
2916 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2917 u32 *rate_n_flags, int index)
2918 {
2919 struct iwl_mvm *mvm;
2920 u8 valid_tx_ant;
2921 u8 ant_sel_tx;
2922
2923 mvm = lq_sta->drv;
2924 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
2925 if (lq_sta->dbg_fixed_rate) {
2926 ant_sel_tx =
2927 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
2928 >> RATE_MCS_ANT_POS);
2929 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
2930 *rate_n_flags = lq_sta->dbg_fixed_rate;
2931 IWL_DEBUG_RATE(mvm, "Fixed rate ON\n");
2932 } else {
2933 lq_sta->dbg_fixed_rate = 0;
2934 IWL_ERR(mvm,
2935 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
2936 ant_sel_tx, valid_tx_ant);
2937 IWL_DEBUG_RATE(mvm, "Fixed rate OFF\n");
2938 }
2939 } else {
2940 IWL_DEBUG_RATE(mvm, "Fixed rate OFF\n");
2941 }
2942 }
2943
2944 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2945 const char __user *user_buf, size_t count, loff_t *ppos)
2946 {
2947 struct iwl_lq_sta *lq_sta = file->private_data;
2948 struct iwl_mvm *mvm;
2949 char buf[64];
2950 size_t buf_size;
2951 u32 parsed_rate;
2952
2953
2954 mvm = lq_sta->drv;
2955 memset(buf, 0, sizeof(buf));
2956 buf_size = min(count, sizeof(buf) - 1);
2957 if (copy_from_user(buf, user_buf, buf_size))
2958 return -EFAULT;
2959
2960 if (sscanf(buf, "%x", &parsed_rate) == 1)
2961 lq_sta->dbg_fixed_rate = parsed_rate;
2962 else
2963 lq_sta->dbg_fixed_rate = 0;
2964
2965 rs_program_fix_rate(mvm, lq_sta);
2966
2967 return count;
2968 }
2969
2970 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2971 char __user *user_buf, size_t count, loff_t *ppos)
2972 {
2973 char *buff;
2974 int desc = 0;
2975 int i = 0;
2976 int index = 0;
2977 ssize_t ret;
2978
2979 struct iwl_lq_sta *lq_sta = file->private_data;
2980 struct iwl_mvm *mvm;
2981 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2982
2983 mvm = lq_sta->drv;
2984 buff = kmalloc(1024, GFP_KERNEL);
2985 if (!buff)
2986 return -ENOMEM;
2987
2988 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2989 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2990 lq_sta->total_failed, lq_sta->total_success,
2991 lq_sta->active_legacy_rate);
2992 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2993 lq_sta->dbg_fixed_rate);
2994 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
2995 (iwl_fw_valid_tx_ant(mvm->fw) & ANT_A) ? "ANT_A," : "",
2996 (iwl_fw_valid_tx_ant(mvm->fw) & ANT_B) ? "ANT_B," : "",
2997 (iwl_fw_valid_tx_ant(mvm->fw) & ANT_C) ? "ANT_C" : "");
2998 desc += sprintf(buff+desc, "lq type %s\n",
2999 (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
3000 if (is_Ht(tbl->lq_type)) {
3001 desc += sprintf(buff+desc, " %s",
3002 (is_siso(tbl->lq_type)) ? "SISO" :
3003 ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
3004 desc += sprintf(buff+desc, " %s",
3005 (tbl->is_ht40) ? "40MHz" : "20MHz");
3006 desc += sprintf(buff+desc, " %s %s %s\n",
3007 (tbl->is_SGI) ? "SGI" : "",
3008 (lq_sta->is_green) ? "GF enabled" : "",
3009 (lq_sta->is_agg) ? "AGG on" : "");
3010 }
3011 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3012 lq_sta->last_rate_n_flags);
3013 desc += sprintf(buff+desc,
3014 "general: flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
3015 lq_sta->lq.flags,
3016 lq_sta->lq.mimo_delim,
3017 lq_sta->lq.single_stream_ant_msk,
3018 lq_sta->lq.dual_stream_ant_msk);
3019
3020 desc += sprintf(buff+desc,
3021 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3022 le16_to_cpu(lq_sta->lq.agg_time_limit),
3023 lq_sta->lq.agg_disable_start_th,
3024 lq_sta->lq.agg_frame_cnt_limit);
3025
3026 desc += sprintf(buff+desc,
3027 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3028 lq_sta->lq.initial_rate_index[0],
3029 lq_sta->lq.initial_rate_index[1],
3030 lq_sta->lq.initial_rate_index[2],
3031 lq_sta->lq.initial_rate_index[3]);
3032
3033 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3034 index = iwl_hwrate_to_plcp_idx(
3035 le32_to_cpu(lq_sta->lq.rs_table[i]));
3036 if (is_legacy(tbl->lq_type)) {
3037 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
3038 i, le32_to_cpu(lq_sta->lq.rs_table[i]),
3039 iwl_rate_mcs[index].mbps);
3040 } else {
3041 desc += sprintf(buff+desc,
3042 " rate[%d] 0x%X %smbps (%s)\n",
3043 i, le32_to_cpu(lq_sta->lq.rs_table[i]),
3044 iwl_rate_mcs[index].mbps,
3045 iwl_rate_mcs[index].mcs);
3046 }
3047 }
3048
3049 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3050 kfree(buff);
3051 return ret;
3052 }
3053
3054 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3055 .write = rs_sta_dbgfs_scale_table_write,
3056 .read = rs_sta_dbgfs_scale_table_read,
3057 .open = simple_open,
3058 .llseek = default_llseek,
3059 };
3060 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3061 char __user *user_buf, size_t count, loff_t *ppos)
3062 {
3063 char *buff;
3064 int desc = 0;
3065 int i, j;
3066 ssize_t ret;
3067
3068 struct iwl_lq_sta *lq_sta = file->private_data;
3069
3070 buff = kmalloc(1024, GFP_KERNEL);
3071 if (!buff)
3072 return -ENOMEM;
3073
3074 for (i = 0; i < LQ_SIZE; i++) {
3075 desc += sprintf(buff+desc,
3076 "%s type=%d SGI=%d HT40=%d DUP=0 GF=%d\n"
3077 "rate=0x%X\n",
3078 lq_sta->active_tbl == i ? "*" : "x",
3079 lq_sta->lq_info[i].lq_type,
3080 lq_sta->lq_info[i].is_SGI,
3081 lq_sta->lq_info[i].is_ht40,
3082 lq_sta->is_green,
3083 lq_sta->lq_info[i].current_rate);
3084 for (j = 0; j < IWL_RATE_COUNT; j++) {
3085 desc += sprintf(buff+desc,
3086 "counter=%d success=%d %%=%d\n",
3087 lq_sta->lq_info[i].win[j].counter,
3088 lq_sta->lq_info[i].win[j].success_counter,
3089 lq_sta->lq_info[i].win[j].success_ratio);
3090 }
3091 }
3092 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3093 kfree(buff);
3094 return ret;
3095 }
3096
3097 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3098 .read = rs_sta_dbgfs_stats_table_read,
3099 .open = simple_open,
3100 .llseek = default_llseek,
3101 };
3102
3103 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3104 char __user *user_buf, size_t count, loff_t *ppos)
3105 {
3106 struct iwl_lq_sta *lq_sta = file->private_data;
3107 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3108 char buff[120];
3109 int desc = 0;
3110
3111 if (is_Ht(tbl->lq_type))
3112 desc += sprintf(buff+desc,
3113 "Bit Rate= %d Mb/s\n",
3114 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3115 else
3116 desc += sprintf(buff+desc,
3117 "Bit Rate= %d Mb/s\n",
3118 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3119
3120 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3121 }
3122
3123 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3124 .read = rs_sta_dbgfs_rate_scale_data_read,
3125 .open = simple_open,
3126 .llseek = default_llseek,
3127 };
3128
3129 static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir)
3130 {
3131 struct iwl_lq_sta *lq_sta = mvm_sta;
3132 lq_sta->rs_sta_dbgfs_scale_table_file =
3133 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3134 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3135 lq_sta->rs_sta_dbgfs_stats_table_file =
3136 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3137 lq_sta, &rs_sta_dbgfs_stats_table_ops);
3138 lq_sta->rs_sta_dbgfs_rate_scale_data_file =
3139 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
3140 lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
3141 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
3142 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3143 &lq_sta->tx_agg_tid_en);
3144 }
3145
3146 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
3147 {
3148 struct iwl_lq_sta *lq_sta = mvm_sta;
3149 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3150 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
3151 debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
3152 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
3153 }
3154 #endif
3155
3156 /*
3157 * Initialization of rate scaling information is done by driver after
3158 * the station is added. Since mac80211 calls this function before a
3159 * station is added we ignore it.
3160 */
3161 static void rs_rate_init_stub(void *mvm_r,
3162 struct ieee80211_supported_band *sband,
3163 struct ieee80211_sta *sta, void *mvm_sta)
3164 {
3165 }
3166 static struct rate_control_ops rs_mvm_ops = {
3167 .module = NULL,
3168 .name = RS_NAME,
3169 .tx_status = rs_tx_status,
3170 .get_rate = rs_get_rate,
3171 .rate_init = rs_rate_init_stub,
3172 .alloc = rs_alloc,
3173 .free = rs_free,
3174 .alloc_sta = rs_alloc_sta,
3175 .free_sta = rs_free_sta,
3176 #ifdef CONFIG_MAC80211_DEBUGFS
3177 .add_sta_debugfs = rs_add_debugfs,
3178 .remove_sta_debugfs = rs_remove_debugfs,
3179 #endif
3180 };
3181
3182 int iwl_mvm_rate_control_register(void)
3183 {
3184 return ieee80211_rate_control_register(&rs_mvm_ops);
3185 }
3186
3187 void iwl_mvm_rate_control_unregister(void)
3188 {
3189 ieee80211_rate_control_unregister(&rs_mvm_ops);
3190 }
3191
3192 /**
3193 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
3194 * Tx protection, according to this rquest and previous requests,
3195 * and send the LQ command.
3196 * @lq: The LQ command
3197 * @mvmsta: The station
3198 * @enable: Enable Tx protection?
3199 */
3200 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_lq_cmd *lq,
3201 struct iwl_mvm_sta *mvmsta, bool enable)
3202 {
3203 lockdep_assert_held(&mvm->mutex);
3204
3205 if (enable) {
3206 if (mvmsta->tx_protection == 0)
3207 lq->flags |= LQ_FLAG_SET_STA_TLC_RTS_MSK;
3208 mvmsta->tx_protection++;
3209 } else {
3210 mvmsta->tx_protection--;
3211 if (mvmsta->tx_protection == 0)
3212 lq->flags &= ~LQ_FLAG_SET_STA_TLC_RTS_MSK;
3213 }
3214
3215 return iwl_mvm_send_lq_cmd(mvm, lq, CMD_ASYNC, false);
3216 }
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