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MIPS: Yosemite, Emma: Fix off-by-two in arcs_cmdline buffer size check
[linux-2.6/linux-mips.git] / drivers / net / wireless / iwlwifi / iwl-agn-rs.c
blob66118cea2af343d3f97a0b4fe52cfc7c7e093769
1 /******************************************************************************
2 *
3 * Copyright(c) 2005 - 2011 Intel Corporation. All rights reserved.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2 of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
17 *
18 * The full GNU General Public License is included in this distribution in the
19 * file called LICENSE.
20 *
21 * Contact Information:
22 * Intel Linux Wireless <ilw@linux.intel.com>
23 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
24 *
25 *****************************************************************************/
26 #include <linux/kernel.h>
27 #include <linux/init.h>
28 #include <linux/skbuff.h>
29 #include <linux/slab.h>
30 #include <net/mac80211.h>
31
32 #include <linux/netdevice.h>
33 #include <linux/etherdevice.h>
34 #include <linux/delay.h>
35
36 #include <linux/workqueue.h>
37
38 #include "iwl-dev.h"
39 #include "iwl-core.h"
40 #include "iwl-agn.h"
41
42 #define RS_NAME "iwl-agn-rs"
43
44 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
45 #define IWL_NUMBER_TRY 1
46 #define IWL_HT_NUMBER_TRY 3
47
48 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
49 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
50 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
51
52 /* max allowed rate miss before sync LQ cmd */
53 #define IWL_MISSED_RATE_MAX 15
54 /* max time to accum history 2 seconds */
55 #define IWL_RATE_SCALE_FLUSH_INTVL (3*HZ)
56
57 static u8 rs_ht_to_legacy[] = {
58 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
59 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
60 IWL_RATE_6M_INDEX,
61 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
62 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
63 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
64 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
65 };
66
67 static const u8 ant_toggle_lookup[] = {
68 /*ANT_NONE -> */ ANT_NONE,
69 /*ANT_A -> */ ANT_B,
70 /*ANT_B -> */ ANT_C,
71 /*ANT_AB -> */ ANT_BC,
72 /*ANT_C -> */ ANT_A,
73 /*ANT_AC -> */ ANT_AB,
74 /*ANT_BC -> */ ANT_AC,
75 /*ANT_ABC -> */ ANT_ABC,
76 };
77
78 #define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np) \
79 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
80 IWL_RATE_SISO_##s##M_PLCP, \
81 IWL_RATE_MIMO2_##s##M_PLCP,\
82 IWL_RATE_MIMO3_##s##M_PLCP,\
83 IWL_RATE_##r##M_IEEE, \
84 IWL_RATE_##ip##M_INDEX, \
85 IWL_RATE_##in##M_INDEX, \
86 IWL_RATE_##rp##M_INDEX, \
87 IWL_RATE_##rn##M_INDEX, \
88 IWL_RATE_##pp##M_INDEX, \
89 IWL_RATE_##np##M_INDEX }
90
91 /*
92 * Parameter order:
93 * rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
94 *
95 * If there isn't a valid next or previous rate then INV is used which
96 * maps to IWL_RATE_INVALID
97 *
98 */
99 const struct iwl_rate_info iwl_rates[IWL_RATE_COUNT] = {
100 IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2), /* 1mbps */
101 IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5), /* 2mbps */
102 IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11), /*5.5mbps */
103 IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18), /* 11mbps */
104 IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11), /* 6mbps */
105 IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11), /* 9mbps */
106 IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18), /* 12mbps */
107 IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24), /* 18mbps */
108 IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36), /* 24mbps */
109 IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48), /* 36mbps */
110 IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54), /* 48mbps */
111 IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
112 IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
113 /* FIXME:RS: ^^ should be INV (legacy) */
114 };
115
116 static inline u8 rs_extract_rate(u32 rate_n_flags)
117 {
118 return (u8)(rate_n_flags & RATE_MCS_RATE_MSK);
119 }
120
121 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
122 {
123 int idx = 0;
124
125 /* HT rate format */
126 if (rate_n_flags & RATE_MCS_HT_MSK) {
127 idx = rs_extract_rate(rate_n_flags);
128
129 if (idx >= IWL_RATE_MIMO3_6M_PLCP)
130 idx = idx - IWL_RATE_MIMO3_6M_PLCP;
131 else if (idx >= IWL_RATE_MIMO2_6M_PLCP)
132 idx = idx - IWL_RATE_MIMO2_6M_PLCP;
133
134 idx += IWL_FIRST_OFDM_RATE;
135 /* skip 9M not supported in ht*/
136 if (idx >= IWL_RATE_9M_INDEX)
137 idx += 1;
138 if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE))
139 return idx;
140
141 /* legacy rate format, search for match in table */
142 } else {
143 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
144 if (iwl_rates[idx].plcp ==
145 rs_extract_rate(rate_n_flags))
146 return idx;
147 }
148
149 return -1;
150 }
151
152 static void rs_rate_scale_perform(struct iwl_priv *priv,
153 struct sk_buff *skb,
154 struct ieee80211_sta *sta,
155 struct iwl_lq_sta *lq_sta);
156 static void rs_fill_link_cmd(struct iwl_priv *priv,
157 struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
158 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
159
160
161 #ifdef CONFIG_MAC80211_DEBUGFS
162 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
163 u32 *rate_n_flags, int index);
164 #else
165 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
166 u32 *rate_n_flags, int index)
167 {}
168 #endif
169
170 /**
171 * The following tables contain the expected throughput metrics for all rates
172 *
173 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
174 *
175 * where invalid entries are zeros.
176 *
177 * CCK rates are only valid in legacy table and will only be used in G
178 * (2.4 GHz) band.
179 */
180
181 static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
182 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
183 };
184
185 static s32 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
186 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202}, /* Norm */
187 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210}, /* SGI */
188 {0, 0, 0, 0, 47, 0, 91, 133, 171, 242, 305, 334, 362}, /* AGG */
189 {0, 0, 0, 0, 52, 0, 101, 145, 187, 264, 330, 361, 390}, /* AGG+SGI */
190 };
191
192 static s32 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
193 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
194 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
195 {0, 0, 0, 0, 94, 0, 177, 249, 313, 423, 512, 550, 586}, /* AGG */
196 {0, 0, 0, 0, 104, 0, 193, 270, 338, 454, 545, 584, 620}, /* AGG+SGI */
197 };
198
199 static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
200 {0, 0, 0, 0, 74, 0, 123, 155, 179, 214, 236, 244, 251}, /* Norm */
201 {0, 0, 0, 0, 81, 0, 131, 164, 188, 223, 243, 251, 257}, /* SGI */
202 {0, 0, 0, 0, 89, 0, 167, 235, 296, 402, 488, 526, 560}, /* AGG */
203 {0, 0, 0, 0, 97, 0, 182, 255, 320, 431, 520, 558, 593}, /* AGG+SGI*/
204 };
205
206 static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
207 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
208 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
209 {0, 0, 0, 0, 171, 0, 305, 410, 496, 634, 731, 771, 805}, /* AGG */
210 {0, 0, 0, 0, 186, 0, 329, 439, 527, 667, 764, 803, 838}, /* AGG+SGI */
211 };
212
213 static s32 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = {
214 {0, 0, 0, 0, 99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */
215 {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */
216 {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */
217 {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */
218 };
219
220 static s32 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = {
221 {0, 0, 0, 0, 152, 0, 211, 239, 255, 279, 290, 294, 297}, /* Norm */
222 {0, 0, 0, 0, 160, 0, 219, 245, 261, 284, 294, 297, 300}, /* SGI */
223 {0, 0, 0, 0, 254, 0, 443, 584, 695, 868, 984, 1030, 1070}, /* AGG */
224 {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */
225 };
226
227 /* mbps, mcs */
228 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
229 { "1", "BPSK DSSS"},
230 { "2", "QPSK DSSS"},
231 {"5.5", "BPSK CCK"},
232 { "11", "QPSK CCK"},
233 { "6", "BPSK 1/2"},
234 { "9", "BPSK 1/2"},
235 { "12", "QPSK 1/2"},
236 { "18", "QPSK 3/4"},
237 { "24", "16QAM 1/2"},
238 { "36", "16QAM 3/4"},
239 { "48", "64QAM 2/3"},
240 { "54", "64QAM 3/4"},
241 { "60", "64QAM 5/6"},
242 };
243
244 #define MCS_INDEX_PER_STREAM (8)
245
246 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
247 {
248 window->data = 0;
249 window->success_counter = 0;
250 window->success_ratio = IWL_INVALID_VALUE;
251 window->counter = 0;
252 window->average_tpt = IWL_INVALID_VALUE;
253 window->stamp = 0;
254 }
255
256 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
257 {
258 return (ant_type & valid_antenna) == ant_type;
259 }
260
261 /*
262 * removes the old data from the statistics. All data that is older than
263 * TID_MAX_TIME_DIFF, will be deleted.
264 */
265 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
266 {
267 /* The oldest age we want to keep */
268 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
269
270 while (tl->queue_count &&
271 (tl->time_stamp < oldest_time)) {
272 tl->total -= tl->packet_count[tl->head];
273 tl->packet_count[tl->head] = 0;
274 tl->time_stamp += TID_QUEUE_CELL_SPACING;
275 tl->queue_count--;
276 tl->head++;
277 if (tl->head >= TID_QUEUE_MAX_SIZE)
278 tl->head = 0;
279 }
280 }
281
282 /*
283 * increment traffic load value for tid and also remove
284 * any old values if passed the certain time period
285 */
286 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
287 struct ieee80211_hdr *hdr)
288 {
289 u32 curr_time = jiffies_to_msecs(jiffies);
290 u32 time_diff;
291 s32 index;
292 struct iwl_traffic_load *tl = NULL;
293 u8 tid;
294
295 if (ieee80211_is_data_qos(hdr->frame_control)) {
296 u8 *qc = ieee80211_get_qos_ctl(hdr);
297 tid = qc[0] & 0xf;
298 } else
299 return IWL_MAX_TID_COUNT;
300
301 if (unlikely(tid >= TID_MAX_LOAD_COUNT))
302 return IWL_MAX_TID_COUNT;
303
304 tl = &lq_data->load[tid];
305
306 curr_time -= curr_time % TID_ROUND_VALUE;
307
308 /* Happens only for the first packet. Initialize the data */
309 if (!(tl->queue_count)) {
310 tl->total = 1;
311 tl->time_stamp = curr_time;
312 tl->queue_count = 1;
313 tl->head = 0;
314 tl->packet_count[0] = 1;
315 return IWL_MAX_TID_COUNT;
316 }
317
318 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
319 index = time_diff / TID_QUEUE_CELL_SPACING;
320
321 /* The history is too long: remove data that is older than */
322 /* TID_MAX_TIME_DIFF */
323 if (index >= TID_QUEUE_MAX_SIZE)
324 rs_tl_rm_old_stats(tl, curr_time);
325
326 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
327 tl->packet_count[index] = tl->packet_count[index] + 1;
328 tl->total = tl->total + 1;
329
330 if ((index + 1) > tl->queue_count)
331 tl->queue_count = index + 1;
332
333 return tid;
334 }
335
336 #ifdef CONFIG_MAC80211_DEBUGFS
337 /**
338 * Program the device to use fixed rate for frame transmit
339 * This is for debugging/testing only
340 * once the device start use fixed rate, we need to reload the module
341 * to being back the normal operation.
342 */
343 static void rs_program_fix_rate(struct iwl_priv *priv,
344 struct iwl_lq_sta *lq_sta)
345 {
346 struct iwl_station_priv *sta_priv =
347 container_of(lq_sta, struct iwl_station_priv, lq_sta);
348 struct iwl_rxon_context *ctx = sta_priv->ctx;
349
350 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
351 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
352 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
353 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
354
355 #ifdef CONFIG_IWLWIFI_DEVICE_SVTOOL
356 /* testmode has higher priority to overwirte the fixed rate */
357 if (priv->tm_fixed_rate)
358 lq_sta->dbg_fixed_rate = priv->tm_fixed_rate;
359 #endif
360
361 IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
362 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
363
364 if (lq_sta->dbg_fixed_rate) {
365 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
366 iwl_send_lq_cmd(lq_sta->drv, ctx, &lq_sta->lq, CMD_ASYNC,
367 false);
368 }
369 }
370 #endif
371
372 /*
373 get the traffic load value for tid
374 */
375 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
376 {
377 u32 curr_time = jiffies_to_msecs(jiffies);
378 u32 time_diff;
379 s32 index;
380 struct iwl_traffic_load *tl = NULL;
381
382 if (tid >= TID_MAX_LOAD_COUNT)
383 return 0;
384
385 tl = &(lq_data->load[tid]);
386
387 curr_time -= curr_time % TID_ROUND_VALUE;
388
389 if (!(tl->queue_count))
390 return 0;
391
392 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
393 index = time_diff / TID_QUEUE_CELL_SPACING;
394
395 /* The history is too long: remove data that is older than */
396 /* TID_MAX_TIME_DIFF */
397 if (index >= TID_QUEUE_MAX_SIZE)
398 rs_tl_rm_old_stats(tl, curr_time);
399
400 return tl->total;
401 }
402
403 static int rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
404 struct iwl_lq_sta *lq_data, u8 tid,
405 struct ieee80211_sta *sta)
406 {
407 int ret = -EAGAIN;
408 u32 load;
409
410 /*
411 * Don't create TX aggregation sessions when in high
412 * BT traffic, as they would just be disrupted by BT.
413 */
414 if (priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) {
415 IWL_ERR(priv, "BT traffic (%d), no aggregation allowed\n",
416 priv->bt_traffic_load);
417 return ret;
418 }
419
420 load = rs_tl_get_load(lq_data, tid);
421
422 if ((iwlagn_mod_params.auto_agg) || (load > IWL_AGG_LOAD_THRESHOLD)) {
423 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
424 sta->addr, tid);
425 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
426 if (ret == -EAGAIN) {
427 /*
428 * driver and mac80211 is out of sync
429 * this might be cause by reloading firmware
430 * stop the tx ba session here
431 */
432 IWL_ERR(priv, "Fail start Tx agg on tid: %d\n",
433 tid);
434 ieee80211_stop_tx_ba_session(sta, tid);
435 }
436 } else {
437 IWL_DEBUG_HT(priv, "Aggregation not enabled for tid %d "
438 "because load = %u\n", tid, load);
439 }
440 return ret;
441 }
442
443 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
444 struct iwl_lq_sta *lq_data,
445 struct ieee80211_sta *sta)
446 {
447 if (tid < TID_MAX_LOAD_COUNT)
448 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
449 else
450 IWL_ERR(priv, "tid exceeds max load count: %d/%d\n",
451 tid, TID_MAX_LOAD_COUNT);
452 }
453
454 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
455 {
456 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
457 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
458 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
459 }
460
461 /*
462 * Static function to get the expected throughput from an iwl_scale_tbl_info
463 * that wraps a NULL pointer check
464 */
465 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
466 {
467 if (tbl->expected_tpt)
468 return tbl->expected_tpt[rs_index];
469 return 0;
470 }
471
472 /**
473 * rs_collect_tx_data - Update the success/failure sliding window
474 *
475 * We keep a sliding window of the last 62 packets transmitted
476 * at this rate. window->data contains the bitmask of successful
477 * packets.
478 */
479 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
480 int scale_index, int attempts, int successes)
481 {
482 struct iwl_rate_scale_data *window = NULL;
483 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
484 s32 fail_count, tpt;
485
486 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
487 return -EINVAL;
488
489 /* Select window for current tx bit rate */
490 window = &(tbl->win[scale_index]);
491
492 /* Get expected throughput */
493 tpt = get_expected_tpt(tbl, scale_index);
494
495 /*
496 * Keep track of only the latest 62 tx frame attempts in this rate's
497 * history window; anything older isn't really relevant any more.
498 * If we have filled up the sliding window, drop the oldest attempt;
499 * if the oldest attempt (highest bit in bitmap) shows "success",
500 * subtract "1" from the success counter (this is the main reason
501 * we keep these bitmaps!).
502 */
503 while (attempts > 0) {
504 if (window->counter >= IWL_RATE_MAX_WINDOW) {
505
506 /* remove earliest */
507 window->counter = IWL_RATE_MAX_WINDOW - 1;
508
509 if (window->data & mask) {
510 window->data &= ~mask;
511 window->success_counter--;
512 }
513 }
514
515 /* Increment frames-attempted counter */
516 window->counter++;
517
518 /* Shift bitmap by one frame to throw away oldest history */
519 window->data <<= 1;
520
521 /* Mark the most recent #successes attempts as successful */
522 if (successes > 0) {
523 window->success_counter++;
524 window->data |= 0x1;
525 successes--;
526 }
527
528 attempts--;
529 }
530
531 /* Calculate current success ratio, avoid divide-by-0! */
532 if (window->counter > 0)
533 window->success_ratio = 128 * (100 * window->success_counter)
534 / window->counter;
535 else
536 window->success_ratio = IWL_INVALID_VALUE;
537
538 fail_count = window->counter - window->success_counter;
539
540 /* Calculate average throughput, if we have enough history. */
541 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
542 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
543 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
544 else
545 window->average_tpt = IWL_INVALID_VALUE;
546
547 /* Tag this window as having been updated */
548 window->stamp = jiffies;
549
550 return 0;
551 }
552
553 /*
554 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
555 */
556 /* FIXME:RS:remove this function and put the flags statically in the table */
557 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
558 struct iwl_scale_tbl_info *tbl,
559 int index, u8 use_green)
560 {
561 u32 rate_n_flags = 0;
562
563 if (is_legacy(tbl->lq_type)) {
564 rate_n_flags = iwl_rates[index].plcp;
565 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
566 rate_n_flags |= RATE_MCS_CCK_MSK;
567
568 } else if (is_Ht(tbl->lq_type)) {
569 if (index > IWL_LAST_OFDM_RATE) {
570 IWL_ERR(priv, "Invalid HT rate index %d\n", index);
571 index = IWL_LAST_OFDM_RATE;
572 }
573 rate_n_flags = RATE_MCS_HT_MSK;
574
575 if (is_siso(tbl->lq_type))
576 rate_n_flags |= iwl_rates[index].plcp_siso;
577 else if (is_mimo2(tbl->lq_type))
578 rate_n_flags |= iwl_rates[index].plcp_mimo2;
579 else
580 rate_n_flags |= iwl_rates[index].plcp_mimo3;
581 } else {
582 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
583 }
584
585 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
586 RATE_MCS_ANT_ABC_MSK);
587
588 if (is_Ht(tbl->lq_type)) {
589 if (tbl->is_ht40) {
590 if (tbl->is_dup)
591 rate_n_flags |= RATE_MCS_DUP_MSK;
592 else
593 rate_n_flags |= RATE_MCS_HT40_MSK;
594 }
595 if (tbl->is_SGI)
596 rate_n_flags |= RATE_MCS_SGI_MSK;
597
598 if (use_green) {
599 rate_n_flags |= RATE_MCS_GF_MSK;
600 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
601 rate_n_flags &= ~RATE_MCS_SGI_MSK;
602 IWL_ERR(priv, "GF was set with SGI:SISO\n");
603 }
604 }
605 }
606 return rate_n_flags;
607 }
608
609 /*
610 * Interpret uCode API's rate_n_flags format,
611 * fill "search" or "active" tx mode table.
612 */
613 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
614 enum ieee80211_band band,
615 struct iwl_scale_tbl_info *tbl,
616 int *rate_idx)
617 {
618 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
619 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
620 u8 mcs;
621
622 memset(tbl, 0, sizeof(struct iwl_scale_tbl_info));
623 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
624
625 if (*rate_idx == IWL_RATE_INVALID) {
626 *rate_idx = -1;
627 return -EINVAL;
628 }
629 tbl->is_SGI = 0; /* default legacy setup */
630 tbl->is_ht40 = 0;
631 tbl->is_dup = 0;
632 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
633 tbl->lq_type = LQ_NONE;
634 tbl->max_search = IWL_MAX_SEARCH;
635
636 /* legacy rate format */
637 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
638 if (num_of_ant == 1) {
639 if (band == IEEE80211_BAND_5GHZ)
640 tbl->lq_type = LQ_A;
641 else
642 tbl->lq_type = LQ_G;
643 }
644 /* HT rate format */
645 } else {
646 if (rate_n_flags & RATE_MCS_SGI_MSK)
647 tbl->is_SGI = 1;
648
649 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
650 (rate_n_flags & RATE_MCS_DUP_MSK))
651 tbl->is_ht40 = 1;
652
653 if (rate_n_flags & RATE_MCS_DUP_MSK)
654 tbl->is_dup = 1;
655
656 mcs = rs_extract_rate(rate_n_flags);
657
658 /* SISO */
659 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
660 if (num_of_ant == 1)
661 tbl->lq_type = LQ_SISO; /*else NONE*/
662 /* MIMO2 */
663 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
664 if (num_of_ant == 2)
665 tbl->lq_type = LQ_MIMO2;
666 /* MIMO3 */
667 } else {
668 if (num_of_ant == 3) {
669 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
670 tbl->lq_type = LQ_MIMO3;
671 }
672 }
673 }
674 return 0;
675 }
676
677 /* switch to another antenna/antennas and return 1 */
678 /* if no other valid antenna found, return 0 */
679 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
680 struct iwl_scale_tbl_info *tbl)
681 {
682 u8 new_ant_type;
683
684 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
685 return 0;
686
687 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
688 return 0;
689
690 new_ant_type = ant_toggle_lookup[tbl->ant_type];
691
692 while ((new_ant_type != tbl->ant_type) &&
693 !rs_is_valid_ant(valid_ant, new_ant_type))
694 new_ant_type = ant_toggle_lookup[new_ant_type];
695
696 if (new_ant_type == tbl->ant_type)
697 return 0;
698
699 tbl->ant_type = new_ant_type;
700 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
701 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
702 return 1;
703 }
704
705 /**
706 * Green-field mode is valid if the station supports it and
707 * there are no non-GF stations present in the BSS.
708 */
709 static bool rs_use_green(struct ieee80211_sta *sta)
710 {
711 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
712 struct iwl_rxon_context *ctx = sta_priv->ctx;
713
714 return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
715 !(ctx->ht.non_gf_sta_present);
716 }
717
718 /**
719 * rs_get_supported_rates - get the available rates
720 *
721 * if management frame or broadcast frame only return
722 * basic available rates.
723 *
724 */
725 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
726 struct ieee80211_hdr *hdr,
727 enum iwl_table_type rate_type)
728 {
729 if (is_legacy(rate_type)) {
730 return lq_sta->active_legacy_rate;
731 } else {
732 if (is_siso(rate_type))
733 return lq_sta->active_siso_rate;
734 else if (is_mimo2(rate_type))
735 return lq_sta->active_mimo2_rate;
736 else
737 return lq_sta->active_mimo3_rate;
738 }
739 }
740
741 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
742 int rate_type)
743 {
744 u8 high = IWL_RATE_INVALID;
745 u8 low = IWL_RATE_INVALID;
746
747 /* 802.11A or ht walks to the next literal adjacent rate in
748 * the rate table */
749 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
750 int i;
751 u32 mask;
752
753 /* Find the previous rate that is in the rate mask */
754 i = index - 1;
755 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
756 if (rate_mask & mask) {
757 low = i;
758 break;
759 }
760 }
761
762 /* Find the next rate that is in the rate mask */
763 i = index + 1;
764 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
765 if (rate_mask & mask) {
766 high = i;
767 break;
768 }
769 }
770
771 return (high << 8) | low;
772 }
773
774 low = index;
775 while (low != IWL_RATE_INVALID) {
776 low = iwl_rates[low].prev_rs;
777 if (low == IWL_RATE_INVALID)
778 break;
779 if (rate_mask & (1 << low))
780 break;
781 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
782 }
783
784 high = index;
785 while (high != IWL_RATE_INVALID) {
786 high = iwl_rates[high].next_rs;
787 if (high == IWL_RATE_INVALID)
788 break;
789 if (rate_mask & (1 << high))
790 break;
791 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
792 }
793
794 return (high << 8) | low;
795 }
796
797 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
798 struct iwl_scale_tbl_info *tbl,
799 u8 scale_index, u8 ht_possible)
800 {
801 s32 low;
802 u16 rate_mask;
803 u16 high_low;
804 u8 switch_to_legacy = 0;
805 u8 is_green = lq_sta->is_green;
806 struct iwl_priv *priv = lq_sta->drv;
807
808 /* check if we need to switch from HT to legacy rates.
809 * assumption is that mandatory rates (1Mbps or 6Mbps)
810 * are always supported (spec demand) */
811 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
812 switch_to_legacy = 1;
813 scale_index = rs_ht_to_legacy[scale_index];
814 if (lq_sta->band == IEEE80211_BAND_5GHZ)
815 tbl->lq_type = LQ_A;
816 else
817 tbl->lq_type = LQ_G;
818
819 if (num_of_ant(tbl->ant_type) > 1)
820 tbl->ant_type =
821 first_antenna(hw_params(priv).valid_tx_ant);
822
823 tbl->is_ht40 = 0;
824 tbl->is_SGI = 0;
825 tbl->max_search = IWL_MAX_SEARCH;
826 }
827
828 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
829
830 /* Mask with station rate restriction */
831 if (is_legacy(tbl->lq_type)) {
832 /* supp_rates has no CCK bits in A mode */
833 if (lq_sta->band == IEEE80211_BAND_5GHZ)
834 rate_mask = (u16)(rate_mask &
835 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
836 else
837 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
838 }
839
840 /* If we switched from HT to legacy, check current rate */
841 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
842 low = scale_index;
843 goto out;
844 }
845
846 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
847 tbl->lq_type);
848 low = high_low & 0xff;
849
850 if (low == IWL_RATE_INVALID)
851 low = scale_index;
852
853 out:
854 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
855 }
856
857 /*
858 * Simple function to compare two rate scale table types
859 */
860 static bool table_type_matches(struct iwl_scale_tbl_info *a,
861 struct iwl_scale_tbl_info *b)
862 {
863 return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
864 (a->is_SGI == b->is_SGI);
865 }
866
867 static void rs_bt_update_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
868 struct iwl_lq_sta *lq_sta)
869 {
870 struct iwl_scale_tbl_info *tbl;
871 bool full_concurrent = priv->bt_full_concurrent;
872 unsigned long flags;
873
874 if (priv->bt_ant_couple_ok) {
875 /*
876 * Is there a need to switch between
877 * full concurrency and 3-wire?
878 */
879 spin_lock_irqsave(&priv->shrd->lock, flags);
880 if (priv->bt_ci_compliance && priv->bt_ant_couple_ok)
881 full_concurrent = true;
882 else
883 full_concurrent = false;
884 spin_unlock_irqrestore(&priv->shrd->lock, flags);
885 }
886 if ((priv->bt_traffic_load != priv->last_bt_traffic_load) ||
887 (priv->bt_full_concurrent != full_concurrent)) {
888 priv->bt_full_concurrent = full_concurrent;
889
890 /* Update uCode's rate table. */
891 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
892 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
893 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
894
895 queue_work(priv->shrd->workqueue, &priv->bt_full_concurrency);
896 }
897 }
898
899 /*
900 * mac80211 sends us Tx status
901 */
902 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
903 struct ieee80211_sta *sta, void *priv_sta,
904 struct sk_buff *skb)
905 {
906 int legacy_success;
907 int retries;
908 int rs_index, mac_index, i;
909 struct iwl_lq_sta *lq_sta = priv_sta;
910 struct iwl_link_quality_cmd *table;
911 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
912 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
913 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
914 enum mac80211_rate_control_flags mac_flags;
915 u32 tx_rate;
916 struct iwl_scale_tbl_info tbl_type;
917 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
918 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
919 struct iwl_rxon_context *ctx = sta_priv->ctx;
920
921 IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
922
923 /* Treat uninitialized rate scaling data same as non-existing. */
924 if (!lq_sta) {
925 IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n");
926 return;
927 } else if (!lq_sta->drv) {
928 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
929 return;
930 }
931
932 if (!ieee80211_is_data(hdr->frame_control) ||
933 info->flags & IEEE80211_TX_CTL_NO_ACK)
934 return;
935
936 /* This packet was aggregated but doesn't carry status info */
937 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
938 !(info->flags & IEEE80211_TX_STAT_AMPDU))
939 return;
940
941 /*
942 * Ignore this Tx frame response if its initial rate doesn't match
943 * that of latest Link Quality command. There may be stragglers
944 * from a previous Link Quality command, but we're no longer interested
945 * in those; they're either from the "active" mode while we're trying
946 * to check "search" mode, or a prior "search" mode after we've moved
947 * to a new "search" mode (which might become the new "active" mode).
948 */
949 table = &lq_sta->lq;
950 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
951 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
952 if (priv->band == IEEE80211_BAND_5GHZ)
953 rs_index -= IWL_FIRST_OFDM_RATE;
954 mac_flags = info->status.rates[0].flags;
955 mac_index = info->status.rates[0].idx;
956 /* For HT packets, map MCS to PLCP */
957 if (mac_flags & IEEE80211_TX_RC_MCS) {
958 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
959 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
960 mac_index++;
961 /*
962 * mac80211 HT index is always zero-indexed; we need to move
963 * HT OFDM rates after CCK rates in 2.4 GHz band
964 */
965 if (priv->band == IEEE80211_BAND_2GHZ)
966 mac_index += IWL_FIRST_OFDM_RATE;
967 }
968 /* Here we actually compare this rate to the latest LQ command */
969 if ((mac_index < 0) ||
970 (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
971 (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
972 (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
973 (tbl_type.ant_type != info->antenna_sel_tx) ||
974 (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
975 (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
976 (rs_index != mac_index)) {
977 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate);
978 /*
979 * Since rates mis-match, the last LQ command may have failed.
980 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
981 * ... driver.
982 */
983 lq_sta->missed_rate_counter++;
984 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
985 lq_sta->missed_rate_counter = 0;
986 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
987 }
988 /* Regardless, ignore this status info for outdated rate */
989 return;
990 } else
991 /* Rate did match, so reset the missed_rate_counter */
992 lq_sta->missed_rate_counter = 0;
993
994 /* Figure out if rate scale algorithm is in active or search table */
995 if (table_type_matches(&tbl_type,
996 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
997 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
998 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
999 } else if (table_type_matches(&tbl_type,
1000 &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
1001 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1002 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1003 } else {
1004 IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n");
1005 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1006 IWL_DEBUG_RATE(priv, "active- lq:%x, ant:%x, SGI:%d\n",
1007 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
1008 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1009 IWL_DEBUG_RATE(priv, "search- lq:%x, ant:%x, SGI:%d\n",
1010 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
1011 IWL_DEBUG_RATE(priv, "actual- lq:%x, ant:%x, SGI:%d\n",
1012 tbl_type.lq_type, tbl_type.ant_type, tbl_type.is_SGI);
1013 /*
1014 * no matching table found, let's by-pass the data collection
1015 * and continue to perform rate scale to find the rate table
1016 */
1017 rs_stay_in_table(lq_sta, true);
1018 goto done;
1019 }
1020
1021 /*
1022 * Updating the frame history depends on whether packets were
1023 * aggregated.
1024 *
1025 * For aggregation, all packets were transmitted at the same rate, the
1026 * first index into rate scale table.
1027 */
1028 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1029 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
1030 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
1031 &rs_index);
1032 rs_collect_tx_data(curr_tbl, rs_index,
1033 info->status.ampdu_len,
1034 info->status.ampdu_ack_len);
1035
1036 /* Update success/fail counts if not searching for new mode */
1037 if (lq_sta->stay_in_tbl) {
1038 lq_sta->total_success += info->status.ampdu_ack_len;
1039 lq_sta->total_failed += (info->status.ampdu_len -
1040 info->status.ampdu_ack_len);
1041 }
1042 } else {
1043 /*
1044 * For legacy, update frame history with for each Tx retry.
1045 */
1046 retries = info->status.rates[0].count - 1;
1047 /* HW doesn't send more than 15 retries */
1048 retries = min(retries, 15);
1049
1050 /* The last transmission may have been successful */
1051 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1052 /* Collect data for each rate used during failed TX attempts */
1053 for (i = 0; i <= retries; ++i) {
1054 tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
1055 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
1056 &tbl_type, &rs_index);
1057 /*
1058 * Only collect stats if retried rate is in the same RS
1059 * table as active/search.
1060 */
1061 if (table_type_matches(&tbl_type, curr_tbl))
1062 tmp_tbl = curr_tbl;
1063 else if (table_type_matches(&tbl_type, other_tbl))
1064 tmp_tbl = other_tbl;
1065 else
1066 continue;
1067 rs_collect_tx_data(tmp_tbl, rs_index, 1,
1068 i < retries ? 0 : legacy_success);
1069 }
1070
1071 /* Update success/fail counts if not searching for new mode */
1072 if (lq_sta->stay_in_tbl) {
1073 lq_sta->total_success += legacy_success;
1074 lq_sta->total_failed += retries + (1 - legacy_success);
1075 }
1076 }
1077 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1078 lq_sta->last_rate_n_flags = tx_rate;
1079 done:
1080 /* See if there's a better rate or modulation mode to try. */
1081 if (sta && sta->supp_rates[sband->band])
1082 rs_rate_scale_perform(priv, skb, sta, lq_sta);
1083
1084 #if defined(CONFIG_MAC80211_DEBUGFS) && defined(CONFIG_IWLWIFI_DEVICE_SVTOOL)
1085 if ((priv->tm_fixed_rate) &&
1086 (priv->tm_fixed_rate != lq_sta->dbg_fixed_rate))
1087 rs_program_fix_rate(priv, lq_sta);
1088 #endif
1089 if (priv->cfg->bt_params && priv->cfg->bt_params->advanced_bt_coexist)
1090 rs_bt_update_lq(priv, ctx, lq_sta);
1091 }
1092
1093 /*
1094 * Begin a period of staying with a selected modulation mode.
1095 * Set "stay_in_tbl" flag to prevent any mode switches.
1096 * Set frame tx success limits according to legacy vs. high-throughput,
1097 * and reset overall (spanning all rates) tx success history statistics.
1098 * These control how long we stay using same modulation mode before
1099 * searching for a new mode.
1100 */
1101 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
1102 struct iwl_lq_sta *lq_sta)
1103 {
1104 IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
1105 lq_sta->stay_in_tbl = 1; /* only place this gets set */
1106 if (is_legacy) {
1107 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1108 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1109 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1110 } else {
1111 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1112 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1113 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1114 }
1115 lq_sta->table_count = 0;
1116 lq_sta->total_failed = 0;
1117 lq_sta->total_success = 0;
1118 lq_sta->flush_timer = jiffies;
1119 lq_sta->action_counter = 0;
1120 }
1121
1122 /*
1123 * Find correct throughput table for given mode of modulation
1124 */
1125 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1126 struct iwl_scale_tbl_info *tbl)
1127 {
1128 /* Used to choose among HT tables */
1129 s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1130
1131 /* Check for invalid LQ type */
1132 if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1133 tbl->expected_tpt = expected_tpt_legacy;
1134 return;
1135 }
1136
1137 /* Legacy rates have only one table */
1138 if (is_legacy(tbl->lq_type)) {
1139 tbl->expected_tpt = expected_tpt_legacy;
1140 return;
1141 }
1142
1143 /* Choose among many HT tables depending on number of streams
1144 * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
1145 * status */
1146 if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1147 ht_tbl_pointer = expected_tpt_siso20MHz;
1148 else if (is_siso(tbl->lq_type))
1149 ht_tbl_pointer = expected_tpt_siso40MHz;
1150 else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1151 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1152 else if (is_mimo2(tbl->lq_type))
1153 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1154 else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1155 ht_tbl_pointer = expected_tpt_mimo3_20MHz;
1156 else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
1157 ht_tbl_pointer = expected_tpt_mimo3_40MHz;
1158
1159 if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */
1160 tbl->expected_tpt = ht_tbl_pointer[0];
1161 else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */
1162 tbl->expected_tpt = ht_tbl_pointer[1];
1163 else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */
1164 tbl->expected_tpt = ht_tbl_pointer[2];
1165 else /* AGG+SGI */
1166 tbl->expected_tpt = ht_tbl_pointer[3];
1167 }
1168
1169 /*
1170 * Find starting rate for new "search" high-throughput mode of modulation.
1171 * Goal is to find lowest expected rate (under perfect conditions) that is
1172 * above the current measured throughput of "active" mode, to give new mode
1173 * a fair chance to prove itself without too many challenges.
1174 *
1175 * This gets called when transitioning to more aggressive modulation
1176 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1177 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1178 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1179 * bit rate will typically need to increase, but not if performance was bad.
1180 */
1181 static s32 rs_get_best_rate(struct iwl_priv *priv,
1182 struct iwl_lq_sta *lq_sta,
1183 struct iwl_scale_tbl_info *tbl, /* "search" */
1184 u16 rate_mask, s8 index)
1185 {
1186 /* "active" values */
1187 struct iwl_scale_tbl_info *active_tbl =
1188 &(lq_sta->lq_info[lq_sta->active_tbl]);
1189 s32 active_sr = active_tbl->win[index].success_ratio;
1190 s32 active_tpt = active_tbl->expected_tpt[index];
1191
1192 /* expected "search" throughput */
1193 s32 *tpt_tbl = tbl->expected_tpt;
1194
1195 s32 new_rate, high, low, start_hi;
1196 u16 high_low;
1197 s8 rate = index;
1198
1199 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1200
1201 for (; ;) {
1202 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1203 tbl->lq_type);
1204
1205 low = high_low & 0xff;
1206 high = (high_low >> 8) & 0xff;
1207
1208 /*
1209 * Lower the "search" bit rate, to give new "search" mode
1210 * approximately the same throughput as "active" if:
1211 *
1212 * 1) "Active" mode has been working modestly well (but not
1213 * great), and expected "search" throughput (under perfect
1214 * conditions) at candidate rate is above the actual
1215 * measured "active" throughput (but less than expected
1216 * "active" throughput under perfect conditions).
1217 * OR
1218 * 2) "Active" mode has been working perfectly or very well
1219 * and expected "search" throughput (under perfect
1220 * conditions) at candidate rate is above expected
1221 * "active" throughput (under perfect conditions).
1222 */
1223 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1224 ((active_sr > IWL_RATE_DECREASE_TH) &&
1225 (active_sr <= IWL_RATE_HIGH_TH) &&
1226 (tpt_tbl[rate] <= active_tpt))) ||
1227 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1228 (tpt_tbl[rate] > active_tpt))) {
1229
1230 /* (2nd or later pass)
1231 * If we've already tried to raise the rate, and are
1232 * now trying to lower it, use the higher rate. */
1233 if (start_hi != IWL_RATE_INVALID) {
1234 new_rate = start_hi;
1235 break;
1236 }
1237
1238 new_rate = rate;
1239
1240 /* Loop again with lower rate */
1241 if (low != IWL_RATE_INVALID)
1242 rate = low;
1243
1244 /* Lower rate not available, use the original */
1245 else
1246 break;
1247
1248 /* Else try to raise the "search" rate to match "active" */
1249 } else {
1250 /* (2nd or later pass)
1251 * If we've already tried to lower the rate, and are
1252 * now trying to raise it, use the lower rate. */
1253 if (new_rate != IWL_RATE_INVALID)
1254 break;
1255
1256 /* Loop again with higher rate */
1257 else if (high != IWL_RATE_INVALID) {
1258 start_hi = high;
1259 rate = high;
1260
1261 /* Higher rate not available, use the original */
1262 } else {
1263 new_rate = rate;
1264 break;
1265 }
1266 }
1267 }
1268
1269 return new_rate;
1270 }
1271
1272 /*
1273 * Set up search table for MIMO2
1274 */
1275 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1276 struct iwl_lq_sta *lq_sta,
1277 struct ieee80211_conf *conf,
1278 struct ieee80211_sta *sta,
1279 struct iwl_scale_tbl_info *tbl, int index)
1280 {
1281 u16 rate_mask;
1282 s32 rate;
1283 s8 is_green = lq_sta->is_green;
1284 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1285 struct iwl_rxon_context *ctx = sta_priv->ctx;
1286
1287 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1288 return -1;
1289
1290 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1291 == WLAN_HT_CAP_SM_PS_STATIC)
1292 return -1;
1293
1294 /* Need both Tx chains/antennas to support MIMO */
1295 if (hw_params(priv).tx_chains_num < 2)
1296 return -1;
1297
1298 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1299
1300 tbl->lq_type = LQ_MIMO2;
1301 tbl->is_dup = lq_sta->is_dup;
1302 tbl->action = 0;
1303 tbl->max_search = IWL_MAX_SEARCH;
1304 rate_mask = lq_sta->active_mimo2_rate;
1305
1306 if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1307 tbl->is_ht40 = 1;
1308 else
1309 tbl->is_ht40 = 0;
1310
1311 rs_set_expected_tpt_table(lq_sta, tbl);
1312
1313 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1314
1315 IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1316 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1317 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1318 rate, rate_mask);
1319 return -1;
1320 }
1321 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1322
1323 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1324 tbl->current_rate, is_green);
1325 return 0;
1326 }
1327
1328 /*
1329 * Set up search table for MIMO3
1330 */
1331 static int rs_switch_to_mimo3(struct iwl_priv *priv,
1332 struct iwl_lq_sta *lq_sta,
1333 struct ieee80211_conf *conf,
1334 struct ieee80211_sta *sta,
1335 struct iwl_scale_tbl_info *tbl, int index)
1336 {
1337 u16 rate_mask;
1338 s32 rate;
1339 s8 is_green = lq_sta->is_green;
1340 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1341 struct iwl_rxon_context *ctx = sta_priv->ctx;
1342
1343 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1344 return -1;
1345
1346 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1347 == WLAN_HT_CAP_SM_PS_STATIC)
1348 return -1;
1349
1350 /* Need both Tx chains/antennas to support MIMO */
1351 if (hw_params(priv).tx_chains_num < 3)
1352 return -1;
1353
1354 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1355
1356 tbl->lq_type = LQ_MIMO3;
1357 tbl->is_dup = lq_sta->is_dup;
1358 tbl->action = 0;
1359 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1360 rate_mask = lq_sta->active_mimo3_rate;
1361
1362 if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1363 tbl->is_ht40 = 1;
1364 else
1365 tbl->is_ht40 = 0;
1366
1367 rs_set_expected_tpt_table(lq_sta, tbl);
1368
1369 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1370
1371 IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1372 rate, rate_mask);
1373 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1374 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1375 rate, rate_mask);
1376 return -1;
1377 }
1378 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1379
1380 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1381 tbl->current_rate, is_green);
1382 return 0;
1383 }
1384
1385 /*
1386 * Set up search table for SISO
1387 */
1388 static int rs_switch_to_siso(struct iwl_priv *priv,
1389 struct iwl_lq_sta *lq_sta,
1390 struct ieee80211_conf *conf,
1391 struct ieee80211_sta *sta,
1392 struct iwl_scale_tbl_info *tbl, int index)
1393 {
1394 u16 rate_mask;
1395 u8 is_green = lq_sta->is_green;
1396 s32 rate;
1397 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1398 struct iwl_rxon_context *ctx = sta_priv->ctx;
1399
1400 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1401 return -1;
1402
1403 IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1404
1405 tbl->is_dup = lq_sta->is_dup;
1406 tbl->lq_type = LQ_SISO;
1407 tbl->action = 0;
1408 tbl->max_search = IWL_MAX_SEARCH;
1409 rate_mask = lq_sta->active_siso_rate;
1410
1411 if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1412 tbl->is_ht40 = 1;
1413 else
1414 tbl->is_ht40 = 0;
1415
1416 if (is_green)
1417 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1418
1419 rs_set_expected_tpt_table(lq_sta, tbl);
1420 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1421
1422 IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1423 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1424 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1425 rate, rate_mask);
1426 return -1;
1427 }
1428 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1429 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1430 tbl->current_rate, is_green);
1431 return 0;
1432 }
1433
1434 /*
1435 * Try to switch to new modulation mode from legacy
1436 */
1437 static int rs_move_legacy_other(struct iwl_priv *priv,
1438 struct iwl_lq_sta *lq_sta,
1439 struct ieee80211_conf *conf,
1440 struct ieee80211_sta *sta,
1441 int index)
1442 {
1443 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1444 struct iwl_scale_tbl_info *search_tbl =
1445 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1446 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1447 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1448 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1449 u8 start_action;
1450 u8 valid_tx_ant = hw_params(priv).valid_tx_ant;
1451 u8 tx_chains_num = hw_params(priv).tx_chains_num;
1452 int ret = 0;
1453 u8 update_search_tbl_counter = 0;
1454
1455 switch (priv->bt_traffic_load) {
1456 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1457 /* nothing */
1458 break;
1459 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1460 /* avoid antenna B unless MIMO */
1461 valid_tx_ant =
1462 first_antenna(hw_params(priv).valid_tx_ant);
1463 if (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2)
1464 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1465 break;
1466 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1467 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1468 /* avoid antenna B and MIMO */
1469 valid_tx_ant =
1470 first_antenna(hw_params(priv).valid_tx_ant);
1471 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2 &&
1472 tbl->action != IWL_LEGACY_SWITCH_SISO)
1473 tbl->action = IWL_LEGACY_SWITCH_SISO;
1474 break;
1475 default:
1476 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1477 break;
1478 }
1479
1480 if (!iwl_ht_enabled(priv))
1481 /* stay in Legacy */
1482 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1483 else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1484 tbl->action > IWL_LEGACY_SWITCH_SISO)
1485 tbl->action = IWL_LEGACY_SWITCH_SISO;
1486
1487 /* configure as 1x1 if bt full concurrency */
1488 if (priv->bt_full_concurrent) {
1489 if (!iwl_ht_enabled(priv))
1490 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1491 else if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1492 tbl->action = IWL_LEGACY_SWITCH_SISO;
1493 valid_tx_ant =
1494 first_antenna(hw_params(priv).valid_tx_ant);
1495 }
1496
1497 start_action = tbl->action;
1498 for (; ;) {
1499 lq_sta->action_counter++;
1500 switch (tbl->action) {
1501 case IWL_LEGACY_SWITCH_ANTENNA1:
1502 case IWL_LEGACY_SWITCH_ANTENNA2:
1503 IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1504
1505 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1506 tx_chains_num <= 1) ||
1507 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1508 tx_chains_num <= 2))
1509 break;
1510
1511 /* Don't change antenna if success has been great */
1512 if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1513 !priv->bt_full_concurrent &&
1514 priv->bt_traffic_load ==
1515 IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1516 break;
1517
1518 /* Set up search table to try other antenna */
1519 memcpy(search_tbl, tbl, sz);
1520
1521 if (rs_toggle_antenna(valid_tx_ant,
1522 &search_tbl->current_rate, search_tbl)) {
1523 update_search_tbl_counter = 1;
1524 rs_set_expected_tpt_table(lq_sta, search_tbl);
1525 goto out;
1526 }
1527 break;
1528 case IWL_LEGACY_SWITCH_SISO:
1529 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1530
1531 /* Set up search table to try SISO */
1532 memcpy(search_tbl, tbl, sz);
1533 search_tbl->is_SGI = 0;
1534 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1535 search_tbl, index);
1536 if (!ret) {
1537 lq_sta->action_counter = 0;
1538 goto out;
1539 }
1540
1541 break;
1542 case IWL_LEGACY_SWITCH_MIMO2_AB:
1543 case IWL_LEGACY_SWITCH_MIMO2_AC:
1544 case IWL_LEGACY_SWITCH_MIMO2_BC:
1545 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1546
1547 /* Set up search table to try MIMO */
1548 memcpy(search_tbl, tbl, sz);
1549 search_tbl->is_SGI = 0;
1550
1551 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1552 search_tbl->ant_type = ANT_AB;
1553 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1554 search_tbl->ant_type = ANT_AC;
1555 else
1556 search_tbl->ant_type = ANT_BC;
1557
1558 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1559 break;
1560
1561 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1562 search_tbl, index);
1563 if (!ret) {
1564 lq_sta->action_counter = 0;
1565 goto out;
1566 }
1567 break;
1568
1569 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1570 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1571
1572 /* Set up search table to try MIMO3 */
1573 memcpy(search_tbl, tbl, sz);
1574 search_tbl->is_SGI = 0;
1575
1576 search_tbl->ant_type = ANT_ABC;
1577
1578 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1579 break;
1580
1581 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1582 search_tbl, index);
1583 if (!ret) {
1584 lq_sta->action_counter = 0;
1585 goto out;
1586 }
1587 break;
1588 }
1589 tbl->action++;
1590 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1591 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1592
1593 if (tbl->action == start_action)
1594 break;
1595
1596 }
1597 search_tbl->lq_type = LQ_NONE;
1598 return 0;
1599
1600 out:
1601 lq_sta->search_better_tbl = 1;
1602 tbl->action++;
1603 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1604 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1605 if (update_search_tbl_counter)
1606 search_tbl->action = tbl->action;
1607 return 0;
1608
1609 }
1610
1611 /*
1612 * Try to switch to new modulation mode from SISO
1613 */
1614 static int rs_move_siso_to_other(struct iwl_priv *priv,
1615 struct iwl_lq_sta *lq_sta,
1616 struct ieee80211_conf *conf,
1617 struct ieee80211_sta *sta, int index)
1618 {
1619 u8 is_green = lq_sta->is_green;
1620 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1621 struct iwl_scale_tbl_info *search_tbl =
1622 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1623 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1624 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1625 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1626 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1627 u8 start_action;
1628 u8 valid_tx_ant = hw_params(priv).valid_tx_ant;
1629 u8 tx_chains_num = hw_params(priv).tx_chains_num;
1630 u8 update_search_tbl_counter = 0;
1631 int ret;
1632
1633 switch (priv->bt_traffic_load) {
1634 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1635 /* nothing */
1636 break;
1637 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1638 /* avoid antenna B unless MIMO */
1639 valid_tx_ant =
1640 first_antenna(hw_params(priv).valid_tx_ant);
1641 if (tbl->action == IWL_SISO_SWITCH_ANTENNA2)
1642 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1643 break;
1644 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1645 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1646 /* avoid antenna B and MIMO */
1647 valid_tx_ant =
1648 first_antenna(hw_params(priv).valid_tx_ant);
1649 if (tbl->action != IWL_SISO_SWITCH_ANTENNA1)
1650 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1651 break;
1652 default:
1653 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1654 break;
1655 }
1656
1657 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1658 tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1659 /* stay in SISO */
1660 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1661 }
1662
1663 /* configure as 1x1 if bt full concurrency */
1664 if (priv->bt_full_concurrent) {
1665 valid_tx_ant =
1666 first_antenna(hw_params(priv).valid_tx_ant);
1667 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1668 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1669 }
1670
1671 start_action = tbl->action;
1672 for (;;) {
1673 lq_sta->action_counter++;
1674 switch (tbl->action) {
1675 case IWL_SISO_SWITCH_ANTENNA1:
1676 case IWL_SISO_SWITCH_ANTENNA2:
1677 IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1678 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1679 tx_chains_num <= 1) ||
1680 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1681 tx_chains_num <= 2))
1682 break;
1683
1684 if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1685 !priv->bt_full_concurrent &&
1686 priv->bt_traffic_load ==
1687 IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1688 break;
1689
1690 memcpy(search_tbl, tbl, sz);
1691 if (rs_toggle_antenna(valid_tx_ant,
1692 &search_tbl->current_rate, search_tbl)) {
1693 update_search_tbl_counter = 1;
1694 goto out;
1695 }
1696 break;
1697 case IWL_SISO_SWITCH_MIMO2_AB:
1698 case IWL_SISO_SWITCH_MIMO2_AC:
1699 case IWL_SISO_SWITCH_MIMO2_BC:
1700 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1701 memcpy(search_tbl, tbl, sz);
1702 search_tbl->is_SGI = 0;
1703
1704 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1705 search_tbl->ant_type = ANT_AB;
1706 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1707 search_tbl->ant_type = ANT_AC;
1708 else
1709 search_tbl->ant_type = ANT_BC;
1710
1711 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1712 break;
1713
1714 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1715 search_tbl, index);
1716 if (!ret)
1717 goto out;
1718 break;
1719 case IWL_SISO_SWITCH_GI:
1720 if (!tbl->is_ht40 && !(ht_cap->cap &
1721 IEEE80211_HT_CAP_SGI_20))
1722 break;
1723 if (tbl->is_ht40 && !(ht_cap->cap &
1724 IEEE80211_HT_CAP_SGI_40))
1725 break;
1726
1727 IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1728
1729 memcpy(search_tbl, tbl, sz);
1730 if (is_green) {
1731 if (!tbl->is_SGI)
1732 break;
1733 else
1734 IWL_ERR(priv,
1735 "SGI was set in GF+SISO\n");
1736 }
1737 search_tbl->is_SGI = !tbl->is_SGI;
1738 rs_set_expected_tpt_table(lq_sta, search_tbl);
1739 if (tbl->is_SGI) {
1740 s32 tpt = lq_sta->last_tpt / 100;
1741 if (tpt >= search_tbl->expected_tpt[index])
1742 break;
1743 }
1744 search_tbl->current_rate =
1745 rate_n_flags_from_tbl(priv, search_tbl,
1746 index, is_green);
1747 update_search_tbl_counter = 1;
1748 goto out;
1749 case IWL_SISO_SWITCH_MIMO3_ABC:
1750 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1751 memcpy(search_tbl, tbl, sz);
1752 search_tbl->is_SGI = 0;
1753 search_tbl->ant_type = ANT_ABC;
1754
1755 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1756 break;
1757
1758 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1759 search_tbl, index);
1760 if (!ret)
1761 goto out;
1762 break;
1763 }
1764 tbl->action++;
1765 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1766 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1767
1768 if (tbl->action == start_action)
1769 break;
1770 }
1771 search_tbl->lq_type = LQ_NONE;
1772 return 0;
1773
1774 out:
1775 lq_sta->search_better_tbl = 1;
1776 tbl->action++;
1777 if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1778 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1779 if (update_search_tbl_counter)
1780 search_tbl->action = tbl->action;
1781
1782 return 0;
1783 }
1784
1785 /*
1786 * Try to switch to new modulation mode from MIMO2
1787 */
1788 static int rs_move_mimo2_to_other(struct iwl_priv *priv,
1789 struct iwl_lq_sta *lq_sta,
1790 struct ieee80211_conf *conf,
1791 struct ieee80211_sta *sta, int index)
1792 {
1793 s8 is_green = lq_sta->is_green;
1794 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1795 struct iwl_scale_tbl_info *search_tbl =
1796 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1797 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1798 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1799 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1800 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1801 u8 start_action;
1802 u8 valid_tx_ant = hw_params(priv).valid_tx_ant;
1803 u8 tx_chains_num = hw_params(priv).tx_chains_num;
1804 u8 update_search_tbl_counter = 0;
1805 int ret;
1806
1807 switch (priv->bt_traffic_load) {
1808 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1809 /* nothing */
1810 break;
1811 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1812 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1813 /* avoid antenna B and MIMO */
1814 if (tbl->action != IWL_MIMO2_SWITCH_SISO_A)
1815 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1816 break;
1817 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1818 /* avoid antenna B unless MIMO */
1819 if (tbl->action == IWL_MIMO2_SWITCH_SISO_B ||
1820 tbl->action == IWL_MIMO2_SWITCH_SISO_C)
1821 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1822 break;
1823 default:
1824 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1825 break;
1826 }
1827
1828 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1829 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1830 tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1831 /* switch in SISO */
1832 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1833 }
1834
1835 /* configure as 1x1 if bt full concurrency */
1836 if (priv->bt_full_concurrent &&
1837 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1838 tbl->action > IWL_MIMO2_SWITCH_SISO_C))
1839 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1840
1841 start_action = tbl->action;
1842 for (;;) {
1843 lq_sta->action_counter++;
1844 switch (tbl->action) {
1845 case IWL_MIMO2_SWITCH_ANTENNA1:
1846 case IWL_MIMO2_SWITCH_ANTENNA2:
1847 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1848
1849 if (tx_chains_num <= 2)
1850 break;
1851
1852 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1853 break;
1854
1855 memcpy(search_tbl, tbl, sz);
1856 if (rs_toggle_antenna(valid_tx_ant,
1857 &search_tbl->current_rate, search_tbl)) {
1858 update_search_tbl_counter = 1;
1859 goto out;
1860 }
1861 break;
1862 case IWL_MIMO2_SWITCH_SISO_A:
1863 case IWL_MIMO2_SWITCH_SISO_B:
1864 case IWL_MIMO2_SWITCH_SISO_C:
1865 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1866
1867 /* Set up new search table for SISO */
1868 memcpy(search_tbl, tbl, sz);
1869
1870 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1871 search_tbl->ant_type = ANT_A;
1872 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1873 search_tbl->ant_type = ANT_B;
1874 else
1875 search_tbl->ant_type = ANT_C;
1876
1877 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1878 break;
1879
1880 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1881 search_tbl, index);
1882 if (!ret)
1883 goto out;
1884
1885 break;
1886
1887 case IWL_MIMO2_SWITCH_GI:
1888 if (!tbl->is_ht40 && !(ht_cap->cap &
1889 IEEE80211_HT_CAP_SGI_20))
1890 break;
1891 if (tbl->is_ht40 && !(ht_cap->cap &
1892 IEEE80211_HT_CAP_SGI_40))
1893 break;
1894
1895 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1896
1897 /* Set up new search table for MIMO2 */
1898 memcpy(search_tbl, tbl, sz);
1899 search_tbl->is_SGI = !tbl->is_SGI;
1900 rs_set_expected_tpt_table(lq_sta, search_tbl);
1901 /*
1902 * If active table already uses the fastest possible
1903 * modulation (dual stream with short guard interval),
1904 * and it's working well, there's no need to look
1905 * for a better type of modulation!
1906 */
1907 if (tbl->is_SGI) {
1908 s32 tpt = lq_sta->last_tpt / 100;
1909 if (tpt >= search_tbl->expected_tpt[index])
1910 break;
1911 }
1912 search_tbl->current_rate =
1913 rate_n_flags_from_tbl(priv, search_tbl,
1914 index, is_green);
1915 update_search_tbl_counter = 1;
1916 goto out;
1917
1918 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1919 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1920 memcpy(search_tbl, tbl, sz);
1921 search_tbl->is_SGI = 0;
1922 search_tbl->ant_type = ANT_ABC;
1923
1924 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1925 break;
1926
1927 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1928 search_tbl, index);
1929 if (!ret)
1930 goto out;
1931
1932 break;
1933 }
1934 tbl->action++;
1935 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1936 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1937
1938 if (tbl->action == start_action)
1939 break;
1940 }
1941 search_tbl->lq_type = LQ_NONE;
1942 return 0;
1943 out:
1944 lq_sta->search_better_tbl = 1;
1945 tbl->action++;
1946 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1947 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1948 if (update_search_tbl_counter)
1949 search_tbl->action = tbl->action;
1950
1951 return 0;
1952
1953 }
1954
1955 /*
1956 * Try to switch to new modulation mode from MIMO3
1957 */
1958 static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1959 struct iwl_lq_sta *lq_sta,
1960 struct ieee80211_conf *conf,
1961 struct ieee80211_sta *sta, int index)
1962 {
1963 s8 is_green = lq_sta->is_green;
1964 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1965 struct iwl_scale_tbl_info *search_tbl =
1966 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1967 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1968 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1969 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1970 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1971 u8 start_action;
1972 u8 valid_tx_ant = hw_params(priv).valid_tx_ant;
1973 u8 tx_chains_num = hw_params(priv).tx_chains_num;
1974 int ret;
1975 u8 update_search_tbl_counter = 0;
1976
1977 switch (priv->bt_traffic_load) {
1978 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1979 /* nothing */
1980 break;
1981 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1982 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1983 /* avoid antenna B and MIMO */
1984 if (tbl->action != IWL_MIMO3_SWITCH_SISO_A)
1985 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1986 break;
1987 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1988 /* avoid antenna B unless MIMO */
1989 if (tbl->action == IWL_MIMO3_SWITCH_SISO_B ||
1990 tbl->action == IWL_MIMO3_SWITCH_SISO_C)
1991 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1992 break;
1993 default:
1994 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1995 break;
1996 }
1997
1998 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1999 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
2000 tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
2001 /* switch in SISO */
2002 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
2003 }
2004
2005 /* configure as 1x1 if bt full concurrency */
2006 if (priv->bt_full_concurrent &&
2007 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
2008 tbl->action > IWL_MIMO3_SWITCH_SISO_C))
2009 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
2010
2011 start_action = tbl->action;
2012 for (;;) {
2013 lq_sta->action_counter++;
2014 switch (tbl->action) {
2015 case IWL_MIMO3_SWITCH_ANTENNA1:
2016 case IWL_MIMO3_SWITCH_ANTENNA2:
2017 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
2018
2019 if (tx_chains_num <= 3)
2020 break;
2021
2022 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
2023 break;
2024
2025 memcpy(search_tbl, tbl, sz);
2026 if (rs_toggle_antenna(valid_tx_ant,
2027 &search_tbl->current_rate, search_tbl))
2028 goto out;
2029 break;
2030 case IWL_MIMO3_SWITCH_SISO_A:
2031 case IWL_MIMO3_SWITCH_SISO_B:
2032 case IWL_MIMO3_SWITCH_SISO_C:
2033 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
2034
2035 /* Set up new search table for SISO */
2036 memcpy(search_tbl, tbl, sz);
2037
2038 if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
2039 search_tbl->ant_type = ANT_A;
2040 else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
2041 search_tbl->ant_type = ANT_B;
2042 else
2043 search_tbl->ant_type = ANT_C;
2044
2045 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2046 break;
2047
2048 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
2049 search_tbl, index);
2050 if (!ret)
2051 goto out;
2052
2053 break;
2054
2055 case IWL_MIMO3_SWITCH_MIMO2_AB:
2056 case IWL_MIMO3_SWITCH_MIMO2_AC:
2057 case IWL_MIMO3_SWITCH_MIMO2_BC:
2058 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
2059
2060 memcpy(search_tbl, tbl, sz);
2061 search_tbl->is_SGI = 0;
2062 if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
2063 search_tbl->ant_type = ANT_AB;
2064 else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
2065 search_tbl->ant_type = ANT_AC;
2066 else
2067 search_tbl->ant_type = ANT_BC;
2068
2069 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2070 break;
2071
2072 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
2073 search_tbl, index);
2074 if (!ret)
2075 goto out;
2076
2077 break;
2078
2079 case IWL_MIMO3_SWITCH_GI:
2080 if (!tbl->is_ht40 && !(ht_cap->cap &
2081 IEEE80211_HT_CAP_SGI_20))
2082 break;
2083 if (tbl->is_ht40 && !(ht_cap->cap &
2084 IEEE80211_HT_CAP_SGI_40))
2085 break;
2086
2087 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
2088
2089 /* Set up new search table for MIMO */
2090 memcpy(search_tbl, tbl, sz);
2091 search_tbl->is_SGI = !tbl->is_SGI;
2092 rs_set_expected_tpt_table(lq_sta, search_tbl);
2093 /*
2094 * If active table already uses the fastest possible
2095 * modulation (dual stream with short guard interval),
2096 * and it's working well, there's no need to look
2097 * for a better type of modulation!
2098 */
2099 if (tbl->is_SGI) {
2100 s32 tpt = lq_sta->last_tpt / 100;
2101 if (tpt >= search_tbl->expected_tpt[index])
2102 break;
2103 }
2104 search_tbl->current_rate =
2105 rate_n_flags_from_tbl(priv, search_tbl,
2106 index, is_green);
2107 update_search_tbl_counter = 1;
2108 goto out;
2109 }
2110 tbl->action++;
2111 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2112 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2113
2114 if (tbl->action == start_action)
2115 break;
2116 }
2117 search_tbl->lq_type = LQ_NONE;
2118 return 0;
2119 out:
2120 lq_sta->search_better_tbl = 1;
2121 tbl->action++;
2122 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2123 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2124 if (update_search_tbl_counter)
2125 search_tbl->action = tbl->action;
2126
2127 return 0;
2128
2129 }
2130
2131 /*
2132 * Check whether we should continue using same modulation mode, or
2133 * begin search for a new mode, based on:
2134 * 1) # tx successes or failures while using this mode
2135 * 2) # times calling this function
2136 * 3) elapsed time in this mode (not used, for now)
2137 */
2138 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
2139 {
2140 struct iwl_scale_tbl_info *tbl;
2141 int i;
2142 int active_tbl;
2143 int flush_interval_passed = 0;
2144 struct iwl_priv *priv;
2145
2146 priv = lq_sta->drv;
2147 active_tbl = lq_sta->active_tbl;
2148
2149 tbl = &(lq_sta->lq_info[active_tbl]);
2150
2151 /* If we've been disallowing search, see if we should now allow it */
2152 if (lq_sta->stay_in_tbl) {
2153
2154 /* Elapsed time using current modulation mode */
2155 if (lq_sta->flush_timer)
2156 flush_interval_passed =
2157 time_after(jiffies,
2158 (unsigned long)(lq_sta->flush_timer +
2159 IWL_RATE_SCALE_FLUSH_INTVL));
2160
2161 /*
2162 * Check if we should allow search for new modulation mode.
2163 * If many frames have failed or succeeded, or we've used
2164 * this same modulation for a long time, allow search, and
2165 * reset history stats that keep track of whether we should
2166 * allow a new search. Also (below) reset all bitmaps and
2167 * stats in active history.
2168 */
2169 if (force_search ||
2170 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
2171 (lq_sta->total_success > lq_sta->max_success_limit) ||
2172 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
2173 && (flush_interval_passed))) {
2174 IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n:",
2175 lq_sta->total_failed,
2176 lq_sta->total_success,
2177 flush_interval_passed);
2178
2179 /* Allow search for new mode */
2180 lq_sta->stay_in_tbl = 0; /* only place reset */
2181 lq_sta->total_failed = 0;
2182 lq_sta->total_success = 0;
2183 lq_sta->flush_timer = 0;
2184
2185 /*
2186 * Else if we've used this modulation mode enough repetitions
2187 * (regardless of elapsed time or success/failure), reset
2188 * history bitmaps and rate-specific stats for all rates in
2189 * active table.
2190 */
2191 } else {
2192 lq_sta->table_count++;
2193 if (lq_sta->table_count >=
2194 lq_sta->table_count_limit) {
2195 lq_sta->table_count = 0;
2196
2197 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
2198 for (i = 0; i < IWL_RATE_COUNT; i++)
2199 rs_rate_scale_clear_window(
2200 &(tbl->win[i]));
2201 }
2202 }
2203
2204 /* If transitioning to allow "search", reset all history
2205 * bitmaps and stats in active table (this will become the new
2206 * "search" table). */
2207 if (!lq_sta->stay_in_tbl) {
2208 for (i = 0; i < IWL_RATE_COUNT; i++)
2209 rs_rate_scale_clear_window(&(tbl->win[i]));
2210 }
2211 }
2212 }
2213
2214 /*
2215 * setup rate table in uCode
2216 */
2217 static void rs_update_rate_tbl(struct iwl_priv *priv,
2218 struct iwl_rxon_context *ctx,
2219 struct iwl_lq_sta *lq_sta,
2220 struct iwl_scale_tbl_info *tbl,
2221 int index, u8 is_green)
2222 {
2223 u32 rate;
2224
2225 /* Update uCode's rate table. */
2226 rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2227 rs_fill_link_cmd(priv, lq_sta, rate);
2228 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2229 }
2230
2231 /*
2232 * Do rate scaling and search for new modulation mode.
2233 */
2234 static void rs_rate_scale_perform(struct iwl_priv *priv,
2235 struct sk_buff *skb,
2236 struct ieee80211_sta *sta,
2237 struct iwl_lq_sta *lq_sta)
2238 {
2239 struct ieee80211_hw *hw = priv->hw;
2240 struct ieee80211_conf *conf = &hw->conf;
2241 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2242 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2243 int low = IWL_RATE_INVALID;
2244 int high = IWL_RATE_INVALID;
2245 int index;
2246 int i;
2247 struct iwl_rate_scale_data *window = NULL;
2248 int current_tpt = IWL_INVALID_VALUE;
2249 int low_tpt = IWL_INVALID_VALUE;
2250 int high_tpt = IWL_INVALID_VALUE;
2251 u32 fail_count;
2252 s8 scale_action = 0;
2253 u16 rate_mask;
2254 u8 update_lq = 0;
2255 struct iwl_scale_tbl_info *tbl, *tbl1;
2256 u16 rate_scale_index_msk = 0;
2257 u8 is_green = 0;
2258 u8 active_tbl = 0;
2259 u8 done_search = 0;
2260 u16 high_low;
2261 s32 sr;
2262 u8 tid = IWL_MAX_TID_COUNT;
2263 struct iwl_tid_data *tid_data;
2264 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
2265 struct iwl_rxon_context *ctx = sta_priv->ctx;
2266
2267 IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
2268
2269 /* Send management frames and NO_ACK data using lowest rate. */
2270 /* TODO: this could probably be improved.. */
2271 if (!ieee80211_is_data(hdr->frame_control) ||
2272 info->flags & IEEE80211_TX_CTL_NO_ACK)
2273 return;
2274
2275 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
2276
2277 tid = rs_tl_add_packet(lq_sta, hdr);
2278 if ((tid != IWL_MAX_TID_COUNT) &&
2279 (lq_sta->tx_agg_tid_en & (1 << tid))) {
2280 tid_data = &priv->shrd->tid_data[lq_sta->lq.sta_id][tid];
2281 if (tid_data->agg.state == IWL_AGG_OFF)
2282 lq_sta->is_agg = 0;
2283 else
2284 lq_sta->is_agg = 1;
2285 } else
2286 lq_sta->is_agg = 0;
2287
2288 /*
2289 * Select rate-scale / modulation-mode table to work with in
2290 * the rest of this function: "search" if searching for better
2291 * modulation mode, or "active" if doing rate scaling within a mode.
2292 */
2293 if (!lq_sta->search_better_tbl)
2294 active_tbl = lq_sta->active_tbl;
2295 else
2296 active_tbl = 1 - lq_sta->active_tbl;
2297
2298 tbl = &(lq_sta->lq_info[active_tbl]);
2299 if (is_legacy(tbl->lq_type))
2300 lq_sta->is_green = 0;
2301 else
2302 lq_sta->is_green = rs_use_green(sta);
2303 is_green = lq_sta->is_green;
2304
2305 /* current tx rate */
2306 index = lq_sta->last_txrate_idx;
2307
2308 IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2309 tbl->lq_type);
2310
2311 /* rates available for this association, and for modulation mode */
2312 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2313
2314 IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
2315
2316 /* mask with station rate restriction */
2317 if (is_legacy(tbl->lq_type)) {
2318 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2319 /* supp_rates has no CCK bits in A mode */
2320 rate_scale_index_msk = (u16) (rate_mask &
2321 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2322 else
2323 rate_scale_index_msk = (u16) (rate_mask &
2324 lq_sta->supp_rates);
2325
2326 } else
2327 rate_scale_index_msk = rate_mask;
2328
2329 if (!rate_scale_index_msk)
2330 rate_scale_index_msk = rate_mask;
2331
2332 if (!((1 << index) & rate_scale_index_msk)) {
2333 IWL_ERR(priv, "Current Rate is not valid\n");
2334 if (lq_sta->search_better_tbl) {
2335 /* revert to active table if search table is not valid*/
2336 tbl->lq_type = LQ_NONE;
2337 lq_sta->search_better_tbl = 0;
2338 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2339 /* get "active" rate info */
2340 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2341 rs_update_rate_tbl(priv, ctx, lq_sta, tbl,
2342 index, is_green);
2343 }
2344 return;
2345 }
2346
2347 /* Get expected throughput table and history window for current rate */
2348 if (!tbl->expected_tpt) {
2349 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2350 return;
2351 }
2352
2353 /* force user max rate if set by user */
2354 if ((lq_sta->max_rate_idx != -1) &&
2355 (lq_sta->max_rate_idx < index)) {
2356 index = lq_sta->max_rate_idx;
2357 update_lq = 1;
2358 window = &(tbl->win[index]);
2359 goto lq_update;
2360 }
2361
2362 window = &(tbl->win[index]);
2363
2364 /*
2365 * If there is not enough history to calculate actual average
2366 * throughput, keep analyzing results of more tx frames, without
2367 * changing rate or mode (bypass most of the rest of this function).
2368 * Set up new rate table in uCode only if old rate is not supported
2369 * in current association (use new rate found above).
2370 */
2371 fail_count = window->counter - window->success_counter;
2372 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2373 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2374 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2375 "for index %d\n",
2376 window->success_counter, window->counter, index);
2377
2378 /* Can't calculate this yet; not enough history */
2379 window->average_tpt = IWL_INVALID_VALUE;
2380
2381 /* Should we stay with this modulation mode,
2382 * or search for a new one? */
2383 rs_stay_in_table(lq_sta, false);
2384
2385 goto out;
2386 }
2387 /* Else we have enough samples; calculate estimate of
2388 * actual average throughput */
2389 if (window->average_tpt != ((window->success_ratio *
2390 tbl->expected_tpt[index] + 64) / 128)) {
2391 IWL_ERR(priv, "expected_tpt should have been calculated by now\n");
2392 window->average_tpt = ((window->success_ratio *
2393 tbl->expected_tpt[index] + 64) / 128);
2394 }
2395
2396 /* If we are searching for better modulation mode, check success. */
2397 if (lq_sta->search_better_tbl &&
2398 (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
2399 /* If good success, continue using the "search" mode;
2400 * no need to send new link quality command, since we're
2401 * continuing to use the setup that we've been trying. */
2402 if (window->average_tpt > lq_sta->last_tpt) {
2403
2404 IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2405 "suc=%d cur-tpt=%d old-tpt=%d\n",
2406 window->success_ratio,
2407 window->average_tpt,
2408 lq_sta->last_tpt);
2409
2410 if (!is_legacy(tbl->lq_type))
2411 lq_sta->enable_counter = 1;
2412
2413 /* Swap tables; "search" becomes "active" */
2414 lq_sta->active_tbl = active_tbl;
2415 current_tpt = window->average_tpt;
2416
2417 /* Else poor success; go back to mode in "active" table */
2418 } else {
2419
2420 IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2421 "suc=%d cur-tpt=%d old-tpt=%d\n",
2422 window->success_ratio,
2423 window->average_tpt,
2424 lq_sta->last_tpt);
2425
2426 /* Nullify "search" table */
2427 tbl->lq_type = LQ_NONE;
2428
2429 /* Revert to "active" table */
2430 active_tbl = lq_sta->active_tbl;
2431 tbl = &(lq_sta->lq_info[active_tbl]);
2432
2433 /* Revert to "active" rate and throughput info */
2434 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2435 current_tpt = lq_sta->last_tpt;
2436
2437 /* Need to set up a new rate table in uCode */
2438 update_lq = 1;
2439 }
2440
2441 /* Either way, we've made a decision; modulation mode
2442 * search is done, allow rate adjustment next time. */
2443 lq_sta->search_better_tbl = 0;
2444 done_search = 1; /* Don't switch modes below! */
2445 goto lq_update;
2446 }
2447
2448 /* (Else) not in search of better modulation mode, try for better
2449 * starting rate, while staying in this mode. */
2450 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2451 tbl->lq_type);
2452 low = high_low & 0xff;
2453 high = (high_low >> 8) & 0xff;
2454
2455 /* If user set max rate, dont allow higher than user constrain */
2456 if ((lq_sta->max_rate_idx != -1) &&
2457 (lq_sta->max_rate_idx < high))
2458 high = IWL_RATE_INVALID;
2459
2460 sr = window->success_ratio;
2461
2462 /* Collect measured throughputs for current and adjacent rates */
2463 current_tpt = window->average_tpt;
2464 if (low != IWL_RATE_INVALID)
2465 low_tpt = tbl->win[low].average_tpt;
2466 if (high != IWL_RATE_INVALID)
2467 high_tpt = tbl->win[high].average_tpt;
2468
2469 scale_action = 0;
2470
2471 /* Too many failures, decrease rate */
2472 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2473 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2474 scale_action = -1;
2475
2476 /* No throughput measured yet for adjacent rates; try increase. */
2477 } else if ((low_tpt == IWL_INVALID_VALUE) &&
2478 (high_tpt == IWL_INVALID_VALUE)) {
2479
2480 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2481 scale_action = 1;
2482 else if (low != IWL_RATE_INVALID)
2483 scale_action = 0;
2484 }
2485
2486 /* Both adjacent throughputs are measured, but neither one has better
2487 * throughput; we're using the best rate, don't change it! */
2488 else if ((low_tpt != IWL_INVALID_VALUE) &&
2489 (high_tpt != IWL_INVALID_VALUE) &&
2490 (low_tpt < current_tpt) &&
2491 (high_tpt < current_tpt))
2492 scale_action = 0;
2493
2494 /* At least one adjacent rate's throughput is measured,
2495 * and may have better performance. */
2496 else {
2497 /* Higher adjacent rate's throughput is measured */
2498 if (high_tpt != IWL_INVALID_VALUE) {
2499 /* Higher rate has better throughput */
2500 if (high_tpt > current_tpt &&
2501 sr >= IWL_RATE_INCREASE_TH) {
2502 scale_action = 1;
2503 } else {
2504 scale_action = 0;
2505 }
2506
2507 /* Lower adjacent rate's throughput is measured */
2508 } else if (low_tpt != IWL_INVALID_VALUE) {
2509 /* Lower rate has better throughput */
2510 if (low_tpt > current_tpt) {
2511 IWL_DEBUG_RATE(priv,
2512 "decrease rate because of low tpt\n");
2513 scale_action = -1;
2514 } else if (sr >= IWL_RATE_INCREASE_TH) {
2515 scale_action = 1;
2516 }
2517 }
2518 }
2519
2520 /* Sanity check; asked for decrease, but success rate or throughput
2521 * has been good at old rate. Don't change it. */
2522 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2523 ((sr > IWL_RATE_HIGH_TH) ||
2524 (current_tpt > (100 * tbl->expected_tpt[low]))))
2525 scale_action = 0;
2526 if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2527 scale_action = -1;
2528 if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
2529 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2530 scale_action = -1;
2531
2532 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2533 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2534 if (lq_sta->last_bt_traffic > priv->bt_traffic_load) {
2535 /*
2536 * don't set scale_action, don't want to scale up if
2537 * the rate scale doesn't otherwise think that is a
2538 * good idea.
2539 */
2540 } else if (lq_sta->last_bt_traffic <= priv->bt_traffic_load) {
2541 scale_action = -1;
2542 }
2543 }
2544 lq_sta->last_bt_traffic = priv->bt_traffic_load;
2545
2546 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2547 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2548 /* search for a new modulation */
2549 rs_stay_in_table(lq_sta, true);
2550 goto lq_update;
2551 }
2552
2553 switch (scale_action) {
2554 case -1:
2555 /* Decrease starting rate, update uCode's rate table */
2556 if (low != IWL_RATE_INVALID) {
2557 update_lq = 1;
2558 index = low;
2559 }
2560
2561 break;
2562 case 1:
2563 /* Increase starting rate, update uCode's rate table */
2564 if (high != IWL_RATE_INVALID) {
2565 update_lq = 1;
2566 index = high;
2567 }
2568
2569 break;
2570 case 0:
2571 /* No change */
2572 default:
2573 break;
2574 }
2575
2576 IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2577 "high %d type %d\n",
2578 index, scale_action, low, high, tbl->lq_type);
2579
2580 lq_update:
2581 /* Replace uCode's rate table for the destination station. */
2582 if (update_lq)
2583 rs_update_rate_tbl(priv, ctx, lq_sta, tbl, index, is_green);
2584
2585 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
2586 /* Should we stay with this modulation mode,
2587 * or search for a new one? */
2588 rs_stay_in_table(lq_sta, false);
2589 }
2590 /*
2591 * Search for new modulation mode if we're:
2592 * 1) Not changing rates right now
2593 * 2) Not just finishing up a search
2594 * 3) Allowing a new search
2595 */
2596 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2597 /* Save current throughput to compare with "search" throughput*/
2598 lq_sta->last_tpt = current_tpt;
2599
2600 /* Select a new "search" modulation mode to try.
2601 * If one is found, set up the new "search" table. */
2602 if (is_legacy(tbl->lq_type))
2603 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2604 else if (is_siso(tbl->lq_type))
2605 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2606 else if (is_mimo2(tbl->lq_type))
2607 rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2608 else
2609 rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2610
2611 /* If new "search" mode was selected, set up in uCode table */
2612 if (lq_sta->search_better_tbl) {
2613 /* Access the "search" table, clear its history. */
2614 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2615 for (i = 0; i < IWL_RATE_COUNT; i++)
2616 rs_rate_scale_clear_window(&(tbl->win[i]));
2617
2618 /* Use new "search" start rate */
2619 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2620
2621 IWL_DEBUG_RATE(priv, "Switch current mcs: %X index: %d\n",
2622 tbl->current_rate, index);
2623 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2624 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2625 } else
2626 done_search = 1;
2627 }
2628
2629 if (done_search && !lq_sta->stay_in_tbl) {
2630 /* If the "active" (non-search) mode was legacy,
2631 * and we've tried switching antennas,
2632 * but we haven't been able to try HT modes (not available),
2633 * stay with best antenna legacy modulation for a while
2634 * before next round of mode comparisons. */
2635 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2636 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2637 lq_sta->action_counter > tbl1->max_search) {
2638 IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2639 rs_set_stay_in_table(priv, 1, lq_sta);
2640 }
2641
2642 /* If we're in an HT mode, and all 3 mode switch actions
2643 * have been tried and compared, stay in this best modulation
2644 * mode for a while before next round of mode comparisons. */
2645 if (lq_sta->enable_counter &&
2646 (lq_sta->action_counter >= tbl1->max_search) &&
2647 iwl_ht_enabled(priv)) {
2648 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2649 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2650 (tid != IWL_MAX_TID_COUNT)) {
2651 u8 sta_id = lq_sta->lq.sta_id;
2652 tid_data =
2653 &priv->shrd->tid_data[sta_id][tid];
2654 if (tid_data->agg.state == IWL_AGG_OFF) {
2655 IWL_DEBUG_RATE(priv,
2656 "try to aggregate tid %d\n",
2657 tid);
2658 rs_tl_turn_on_agg(priv, tid,
2659 lq_sta, sta);
2660 }
2661 }
2662 rs_set_stay_in_table(priv, 0, lq_sta);
2663 }
2664 }
2665
2666 out:
2667 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2668 lq_sta->last_txrate_idx = index;
2669 }
2670
2671 /**
2672 * rs_initialize_lq - Initialize a station's hardware rate table
2673 *
2674 * The uCode's station table contains a table of fallback rates
2675 * for automatic fallback during transmission.
2676 *
2677 * NOTE: This sets up a default set of values. These will be replaced later
2678 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2679 * rc80211_simple.
2680 *
2681 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2682 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2683 * which requires station table entry to exist).
2684 */
2685 static void rs_initialize_lq(struct iwl_priv *priv,
2686 struct ieee80211_conf *conf,
2687 struct ieee80211_sta *sta,
2688 struct iwl_lq_sta *lq_sta)
2689 {
2690 struct iwl_scale_tbl_info *tbl;
2691 int rate_idx;
2692 int i;
2693 u32 rate;
2694 u8 use_green = rs_use_green(sta);
2695 u8 active_tbl = 0;
2696 u8 valid_tx_ant;
2697 struct iwl_station_priv *sta_priv;
2698 struct iwl_rxon_context *ctx;
2699
2700 if (!sta || !lq_sta)
2701 return;
2702
2703 sta_priv = (void *)sta->drv_priv;
2704 ctx = sta_priv->ctx;
2705
2706 i = lq_sta->last_txrate_idx;
2707
2708 valid_tx_ant = hw_params(priv).valid_tx_ant;
2709
2710 if (!lq_sta->search_better_tbl)
2711 active_tbl = lq_sta->active_tbl;
2712 else
2713 active_tbl = 1 - lq_sta->active_tbl;
2714
2715 tbl = &(lq_sta->lq_info[active_tbl]);
2716
2717 if ((i < 0) || (i >= IWL_RATE_COUNT))
2718 i = 0;
2719
2720 rate = iwl_rates[i].plcp;
2721 tbl->ant_type = first_antenna(valid_tx_ant);
2722 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2723
2724 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2725 rate |= RATE_MCS_CCK_MSK;
2726
2727 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2728 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2729 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2730
2731 rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2732 tbl->current_rate = rate;
2733 rs_set_expected_tpt_table(lq_sta, tbl);
2734 rs_fill_link_cmd(NULL, lq_sta, rate);
2735 priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2736 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_SYNC, true);
2737 }
2738
2739 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2740 struct ieee80211_tx_rate_control *txrc)
2741 {
2742
2743 struct sk_buff *skb = txrc->skb;
2744 struct ieee80211_supported_band *sband = txrc->sband;
2745 struct iwl_priv *priv __maybe_unused = (struct iwl_priv *)priv_r;
2746 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2747 struct iwl_lq_sta *lq_sta = priv_sta;
2748 int rate_idx;
2749
2750 IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2751
2752 /* Get max rate if user set max rate */
2753 if (lq_sta) {
2754 lq_sta->max_rate_idx = txrc->max_rate_idx;
2755 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2756 (lq_sta->max_rate_idx != -1))
2757 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2758 if ((lq_sta->max_rate_idx < 0) ||
2759 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2760 lq_sta->max_rate_idx = -1;
2761 }
2762
2763 /* Treat uninitialized rate scaling data same as non-existing. */
2764 if (lq_sta && !lq_sta->drv) {
2765 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
2766 priv_sta = NULL;
2767 }
2768
2769 /* Send management frames and NO_ACK data using lowest rate. */
2770 if (rate_control_send_low(sta, priv_sta, txrc))
2771 return;
2772
2773 rate_idx = lq_sta->last_txrate_idx;
2774
2775 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2776 rate_idx -= IWL_FIRST_OFDM_RATE;
2777 /* 6M and 9M shared same MCS index */
2778 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2779 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2780 IWL_RATE_MIMO3_6M_PLCP)
2781 rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2782 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2783 IWL_RATE_MIMO2_6M_PLCP)
2784 rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2785 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2786 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2787 info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2788 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2789 info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
2790 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2791 info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2792 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2793 info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2794 } else {
2795 /* Check for invalid rates */
2796 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2797 ((sband->band == IEEE80211_BAND_5GHZ) &&
2798 (rate_idx < IWL_FIRST_OFDM_RATE)))
2799 rate_idx = rate_lowest_index(sband, sta);
2800 /* On valid 5 GHz rate, adjust index */
2801 else if (sband->band == IEEE80211_BAND_5GHZ)
2802 rate_idx -= IWL_FIRST_OFDM_RATE;
2803 info->control.rates[0].flags = 0;
2804 }
2805 info->control.rates[0].idx = rate_idx;
2806
2807 }
2808
2809 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2810 gfp_t gfp)
2811 {
2812 struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2813 struct iwl_priv *priv;
2814
2815 priv = (struct iwl_priv *)priv_rate;
2816 IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2817
2818 return &sta_priv->lq_sta;
2819 }
2820
2821 /*
2822 * Called after adding a new station to initialize rate scaling
2823 */
2824 void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id)
2825 {
2826 int i, j;
2827 struct ieee80211_hw *hw = priv->hw;
2828 struct ieee80211_conf *conf = &priv->hw->conf;
2829 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2830 struct iwl_station_priv *sta_priv;
2831 struct iwl_lq_sta *lq_sta;
2832 struct ieee80211_supported_band *sband;
2833
2834 sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2835 lq_sta = &sta_priv->lq_sta;
2836 sband = hw->wiphy->bands[conf->channel->band];
2837
2838
2839 lq_sta->lq.sta_id = sta_id;
2840
2841 for (j = 0; j < LQ_SIZE; j++)
2842 for (i = 0; i < IWL_RATE_COUNT; i++)
2843 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2844
2845 lq_sta->flush_timer = 0;
2846 lq_sta->supp_rates = sta->supp_rates[sband->band];
2847 for (j = 0; j < LQ_SIZE; j++)
2848 for (i = 0; i < IWL_RATE_COUNT; i++)
2849 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2850
2851 IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n",
2852 sta_id);
2853 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2854 * the lowest or the highest rate.. Could consider using RSSI from
2855 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2856 * after assoc.. */
2857
2858 lq_sta->is_dup = 0;
2859 lq_sta->max_rate_idx = -1;
2860 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2861 lq_sta->is_green = rs_use_green(sta);
2862 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2863 lq_sta->band = priv->band;
2864 /*
2865 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2866 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2867 */
2868 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2869 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2870 lq_sta->active_siso_rate &= ~((u16)0x2);
2871 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2872
2873 /* Same here */
2874 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2875 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2876 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2877 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2878
2879 lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2880 lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2881 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2882 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2883
2884 IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2885 lq_sta->active_siso_rate,
2886 lq_sta->active_mimo2_rate,
2887 lq_sta->active_mimo3_rate);
2888
2889 /* These values will be overridden later */
2890 lq_sta->lq.general_params.single_stream_ant_msk =
2891 first_antenna(hw_params(priv).valid_tx_ant);
2892 lq_sta->lq.general_params.dual_stream_ant_msk =
2893 hw_params(priv).valid_tx_ant &
2894 ~first_antenna(hw_params(priv).valid_tx_ant);
2895 if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2896 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2897 } else if (num_of_ant(hw_params(priv).valid_tx_ant) == 2) {
2898 lq_sta->lq.general_params.dual_stream_ant_msk =
2899 hw_params(priv).valid_tx_ant;
2900 }
2901
2902 /* as default allow aggregation for all tids */
2903 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2904 lq_sta->drv = priv;
2905
2906 /* Set last_txrate_idx to lowest rate */
2907 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2908 if (sband->band == IEEE80211_BAND_5GHZ)
2909 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2910 lq_sta->is_agg = 0;
2911 #ifdef CONFIG_IWLWIFI_DEVICE_SVTOOL
2912 priv->tm_fixed_rate = 0;
2913 #endif
2914 #ifdef CONFIG_MAC80211_DEBUGFS
2915 lq_sta->dbg_fixed_rate = 0;
2916 #endif
2917
2918 rs_initialize_lq(priv, conf, sta, lq_sta);
2919 }
2920
2921 static void rs_fill_link_cmd(struct iwl_priv *priv,
2922 struct iwl_lq_sta *lq_sta, u32 new_rate)
2923 {
2924 struct iwl_scale_tbl_info tbl_type;
2925 int index = 0;
2926 int rate_idx;
2927 int repeat_rate = 0;
2928 u8 ant_toggle_cnt = 0;
2929 u8 use_ht_possible = 1;
2930 u8 valid_tx_ant = 0;
2931 struct iwl_station_priv *sta_priv =
2932 container_of(lq_sta, struct iwl_station_priv, lq_sta);
2933 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2934
2935 /* Override starting rate (index 0) if needed for debug purposes */
2936 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2937
2938 /* Interpret new_rate (rate_n_flags) */
2939 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2940 &tbl_type, &rate_idx);
2941
2942 if (priv && priv->bt_full_concurrent) {
2943 /* 1x1 only */
2944 tbl_type.ant_type =
2945 first_antenna(hw_params(priv).valid_tx_ant);
2946 }
2947
2948 /* How many times should we repeat the initial rate? */
2949 if (is_legacy(tbl_type.lq_type)) {
2950 ant_toggle_cnt = 1;
2951 repeat_rate = IWL_NUMBER_TRY;
2952 } else {
2953 repeat_rate = min(IWL_HT_NUMBER_TRY,
2954 LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2955 }
2956
2957 lq_cmd->general_params.mimo_delimiter =
2958 is_mimo(tbl_type.lq_type) ? 1 : 0;
2959
2960 /* Fill 1st table entry (index 0) */
2961 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2962
2963 if (num_of_ant(tbl_type.ant_type) == 1) {
2964 lq_cmd->general_params.single_stream_ant_msk =
2965 tbl_type.ant_type;
2966 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2967 lq_cmd->general_params.dual_stream_ant_msk =
2968 tbl_type.ant_type;
2969 } /* otherwise we don't modify the existing value */
2970
2971 index++;
2972 repeat_rate--;
2973 if (priv) {
2974 if (priv->bt_full_concurrent)
2975 valid_tx_ant = ANT_A;
2976 else
2977 valid_tx_ant = hw_params(priv).valid_tx_ant;
2978 }
2979
2980 /* Fill rest of rate table */
2981 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2982 /* Repeat initial/next rate.
2983 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2984 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2985 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2986 if (is_legacy(tbl_type.lq_type)) {
2987 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2988 ant_toggle_cnt++;
2989 else if (priv &&
2990 rs_toggle_antenna(valid_tx_ant,
2991 &new_rate, &tbl_type))
2992 ant_toggle_cnt = 1;
2993 }
2994
2995 /* Override next rate if needed for debug purposes */
2996 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2997
2998 /* Fill next table entry */
2999 lq_cmd->rs_table[index].rate_n_flags =
3000 cpu_to_le32(new_rate);
3001 repeat_rate--;
3002 index++;
3003 }
3004
3005 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
3006 &rate_idx);
3007
3008 if (priv && priv->bt_full_concurrent) {
3009 /* 1x1 only */
3010 tbl_type.ant_type =
3011 first_antenna(hw_params(priv).valid_tx_ant);
3012 }
3013
3014 /* Indicate to uCode which entries might be MIMO.
3015 * If initial rate was MIMO, this will finally end up
3016 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
3017 if (is_mimo(tbl_type.lq_type))
3018 lq_cmd->general_params.mimo_delimiter = index;
3019
3020 /* Get next rate */
3021 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
3022 use_ht_possible);
3023
3024 /* How many times should we repeat the next rate? */
3025 if (is_legacy(tbl_type.lq_type)) {
3026 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
3027 ant_toggle_cnt++;
3028 else if (priv &&
3029 rs_toggle_antenna(valid_tx_ant,
3030 &new_rate, &tbl_type))
3031 ant_toggle_cnt = 1;
3032
3033 repeat_rate = IWL_NUMBER_TRY;
3034 } else {
3035 repeat_rate = IWL_HT_NUMBER_TRY;
3036 }
3037
3038 /* Don't allow HT rates after next pass.
3039 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
3040 use_ht_possible = 0;
3041
3042 /* Override next rate if needed for debug purposes */
3043 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
3044
3045 /* Fill next table entry */
3046 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
3047
3048 index++;
3049 repeat_rate--;
3050 }
3051
3052 lq_cmd->agg_params.agg_frame_cnt_limit =
3053 sta_priv->max_agg_bufsize ?: LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3054 lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
3055
3056 lq_cmd->agg_params.agg_time_limit =
3057 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
3058 /*
3059 * overwrite if needed, pass aggregation time limit
3060 * to uCode in uSec
3061 */
3062 if (priv && priv->cfg->bt_params &&
3063 priv->cfg->bt_params->agg_time_limit &&
3064 priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH)
3065 lq_cmd->agg_params.agg_time_limit =
3066 cpu_to_le16(priv->cfg->bt_params->agg_time_limit);
3067 }
3068
3069 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3070 {
3071 return hw->priv;
3072 }
3073 /* rate scale requires free function to be implemented */
3074 static void rs_free(void *priv_rate)
3075 {
3076 return;
3077 }
3078
3079 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
3080 void *priv_sta)
3081 {
3082 struct iwl_priv *priv __maybe_unused = priv_r;
3083
3084 IWL_DEBUG_RATE(priv, "enter\n");
3085 IWL_DEBUG_RATE(priv, "leave\n");
3086 }
3087
3088 #ifdef CONFIG_MAC80211_DEBUGFS
3089 static int open_file_generic(struct inode *inode, struct file *file)
3090 {
3091 file->private_data = inode->i_private;
3092 return 0;
3093 }
3094 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
3095 u32 *rate_n_flags, int index)
3096 {
3097 struct iwl_priv *priv;
3098 u8 valid_tx_ant;
3099 u8 ant_sel_tx;
3100
3101 priv = lq_sta->drv;
3102 valid_tx_ant = hw_params(priv).valid_tx_ant;
3103 if (lq_sta->dbg_fixed_rate) {
3104 ant_sel_tx =
3105 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
3106 >> RATE_MCS_ANT_POS);
3107 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
3108 *rate_n_flags = lq_sta->dbg_fixed_rate;
3109 IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
3110 } else {
3111 lq_sta->dbg_fixed_rate = 0;
3112 IWL_ERR(priv,
3113 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
3114 ant_sel_tx, valid_tx_ant);
3115 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3116 }
3117 } else {
3118 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3119 }
3120 }
3121
3122 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3123 const char __user *user_buf, size_t count, loff_t *ppos)
3124 {
3125 struct iwl_lq_sta *lq_sta = file->private_data;
3126 struct iwl_priv *priv;
3127 char buf[64];
3128 size_t buf_size;
3129 u32 parsed_rate;
3130
3131
3132 priv = lq_sta->drv;
3133 memset(buf, 0, sizeof(buf));
3134 buf_size = min(count, sizeof(buf) - 1);
3135 if (copy_from_user(buf, user_buf, buf_size))
3136 return -EFAULT;
3137
3138 if (sscanf(buf, "%x", &parsed_rate) == 1)
3139 lq_sta->dbg_fixed_rate = parsed_rate;
3140 else
3141 lq_sta->dbg_fixed_rate = 0;
3142
3143 rs_program_fix_rate(priv, lq_sta);
3144
3145 return count;
3146 }
3147
3148 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3149 char __user *user_buf, size_t count, loff_t *ppos)
3150 {
3151 char *buff;
3152 int desc = 0;
3153 int i = 0;
3154 int index = 0;
3155 ssize_t ret;
3156
3157 struct iwl_lq_sta *lq_sta = file->private_data;
3158 struct iwl_priv *priv;
3159 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3160
3161 priv = lq_sta->drv;
3162 buff = kmalloc(1024, GFP_KERNEL);
3163 if (!buff)
3164 return -ENOMEM;
3165
3166 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3167 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
3168 lq_sta->total_failed, lq_sta->total_success,
3169 lq_sta->active_legacy_rate);
3170 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3171 lq_sta->dbg_fixed_rate);
3172 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3173 (hw_params(priv).valid_tx_ant & ANT_A) ? "ANT_A," : "",
3174 (hw_params(priv).valid_tx_ant & ANT_B) ? "ANT_B," : "",
3175 (hw_params(priv).valid_tx_ant & ANT_C) ? "ANT_C" : "");
3176 desc += sprintf(buff+desc, "lq type %s\n",
3177 (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
3178 if (is_Ht(tbl->lq_type)) {
3179 desc += sprintf(buff+desc, " %s",
3180 (is_siso(tbl->lq_type)) ? "SISO" :
3181 ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
3182 desc += sprintf(buff+desc, " %s",
3183 (tbl->is_ht40) ? "40MHz" : "20MHz");
3184 desc += sprintf(buff+desc, " %s %s %s\n", (tbl->is_SGI) ? "SGI" : "",
3185 (lq_sta->is_green) ? "GF enabled" : "",
3186 (lq_sta->is_agg) ? "AGG on" : "");
3187 }
3188 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3189 lq_sta->last_rate_n_flags);
3190 desc += sprintf(buff+desc, "general:"
3191 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
3192 lq_sta->lq.general_params.flags,
3193 lq_sta->lq.general_params.mimo_delimiter,
3194 lq_sta->lq.general_params.single_stream_ant_msk,
3195 lq_sta->lq.general_params.dual_stream_ant_msk);
3196
3197 desc += sprintf(buff+desc, "agg:"
3198 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3199 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
3200 lq_sta->lq.agg_params.agg_dis_start_th,
3201 lq_sta->lq.agg_params.agg_frame_cnt_limit);
3202
3203 desc += sprintf(buff+desc,
3204 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3205 lq_sta->lq.general_params.start_rate_index[0],
3206 lq_sta->lq.general_params.start_rate_index[1],
3207 lq_sta->lq.general_params.start_rate_index[2],
3208 lq_sta->lq.general_params.start_rate_index[3]);
3209
3210 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3211 index = iwl_hwrate_to_plcp_idx(
3212 le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
3213 if (is_legacy(tbl->lq_type)) {
3214 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
3215 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3216 iwl_rate_mcs[index].mbps);
3217 } else {
3218 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
3219 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3220 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
3221 }
3222 }
3223
3224 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3225 kfree(buff);
3226 return ret;
3227 }
3228
3229 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3230 .write = rs_sta_dbgfs_scale_table_write,
3231 .read = rs_sta_dbgfs_scale_table_read,
3232 .open = open_file_generic,
3233 .llseek = default_llseek,
3234 };
3235 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3236 char __user *user_buf, size_t count, loff_t *ppos)
3237 {
3238 char *buff;
3239 int desc = 0;
3240 int i, j;
3241 ssize_t ret;
3242
3243 struct iwl_lq_sta *lq_sta = file->private_data;
3244
3245 buff = kmalloc(1024, GFP_KERNEL);
3246 if (!buff)
3247 return -ENOMEM;
3248
3249 for (i = 0; i < LQ_SIZE; i++) {
3250 desc += sprintf(buff+desc,
3251 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
3252 "rate=0x%X\n",
3253 lq_sta->active_tbl == i ? "*" : "x",
3254 lq_sta->lq_info[i].lq_type,
3255 lq_sta->lq_info[i].is_SGI,
3256 lq_sta->lq_info[i].is_ht40,
3257 lq_sta->lq_info[i].is_dup,
3258 lq_sta->is_green,
3259 lq_sta->lq_info[i].current_rate);
3260 for (j = 0; j < IWL_RATE_COUNT; j++) {
3261 desc += sprintf(buff+desc,
3262 "counter=%d success=%d %%=%d\n",
3263 lq_sta->lq_info[i].win[j].counter,
3264 lq_sta->lq_info[i].win[j].success_counter,
3265 lq_sta->lq_info[i].win[j].success_ratio);
3266 }
3267 }
3268 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3269 kfree(buff);
3270 return ret;
3271 }
3272
3273 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3274 .read = rs_sta_dbgfs_stats_table_read,
3275 .open = open_file_generic,
3276 .llseek = default_llseek,
3277 };
3278
3279 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3280 char __user *user_buf, size_t count, loff_t *ppos)
3281 {
3282 struct iwl_lq_sta *lq_sta = file->private_data;
3283 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3284 char buff[120];
3285 int desc = 0;
3286
3287 if (is_Ht(tbl->lq_type))
3288 desc += sprintf(buff+desc,
3289 "Bit Rate= %d Mb/s\n",
3290 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3291 else
3292 desc += sprintf(buff+desc,
3293 "Bit Rate= %d Mb/s\n",
3294 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3295
3296 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3297 }
3298
3299 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3300 .read = rs_sta_dbgfs_rate_scale_data_read,
3301 .open = open_file_generic,
3302 .llseek = default_llseek,
3303 };
3304
3305 static void rs_add_debugfs(void *priv, void *priv_sta,
3306 struct dentry *dir)
3307 {
3308 struct iwl_lq_sta *lq_sta = priv_sta;
3309 lq_sta->rs_sta_dbgfs_scale_table_file =
3310 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3311 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3312 lq_sta->rs_sta_dbgfs_stats_table_file =
3313 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3314 lq_sta, &rs_sta_dbgfs_stats_table_ops);
3315 lq_sta->rs_sta_dbgfs_rate_scale_data_file =
3316 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
3317 lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
3318 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
3319 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3320 &lq_sta->tx_agg_tid_en);
3321
3322 }
3323
3324 static void rs_remove_debugfs(void *priv, void *priv_sta)
3325 {
3326 struct iwl_lq_sta *lq_sta = priv_sta;
3327 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3328 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
3329 debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
3330 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
3331 }
3332 #endif
3333
3334 /*
3335 * Initialization of rate scaling information is done by driver after
3336 * the station is added. Since mac80211 calls this function before a
3337 * station is added we ignore it.
3338 */
3339 static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband,
3340 struct ieee80211_sta *sta, void *priv_sta)
3341 {
3342 }
3343 static struct rate_control_ops rs_ops = {
3344 .module = NULL,
3345 .name = RS_NAME,
3346 .tx_status = rs_tx_status,
3347 .get_rate = rs_get_rate,
3348 .rate_init = rs_rate_init_stub,
3349 .alloc = rs_alloc,
3350 .free = rs_free,
3351 .alloc_sta = rs_alloc_sta,
3352 .free_sta = rs_free_sta,
3353 #ifdef CONFIG_MAC80211_DEBUGFS
3354 .add_sta_debugfs = rs_add_debugfs,
3355 .remove_sta_debugfs = rs_remove_debugfs,
3356 #endif
3357 };
3358
3359 int iwlagn_rate_control_register(void)
3360 {
3361 return ieee80211_rate_control_register(&rs_ops);
3362 }
3363
3364 void iwlagn_rate_control_unregister(void)
3365 {
3366 ieee80211_rate_control_unregister(&rs_ops);
3367 }
3368
Mirror of the linux-mips.org kernel tree