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rs.c
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2  *
3  * Copyright(c) 2005 - 2012 Intel Corporation. All rights reserved.
4  *
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17  *
18  * The full GNU General Public License is included in this distribution in the
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26 #include <linux/kernel.h>
27 #include <linux/init.h>
28 #include <linux/skbuff.h>
29 #include <linux/slab.h>
30 #include <net/mac80211.h>
31 
32 #include <linux/netdevice.h>
33 #include <linux/etherdevice.h>
34 #include <linux/delay.h>
35 
36 #include <linux/workqueue.h>
37 
38 #include "dev.h"
39 #include "agn.h"
40 
41 #define RS_NAME "iwl-agn-rs"
42 
43 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
44 #define IWL_NUMBER_TRY 1
45 #define IWL_HT_NUMBER_TRY 3
46 
47 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
48 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
49 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
50 
51 /* max allowed rate miss before sync LQ cmd */
52 #define IWL_MISSED_RATE_MAX 15
53 /* max time to accum history 2 seconds */
54 #define IWL_RATE_SCALE_FLUSH_INTVL (3*HZ)
55 
56 static u8 rs_ht_to_legacy[] = {
57  IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
58  IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
59  IWL_RATE_6M_INDEX,
60  IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
61  IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
62  IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
63  IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
64 };
65 
66 static const u8 ant_toggle_lookup[] = {
67  /*ANT_NONE -> */ ANT_NONE,
68  /*ANT_A -> */ ANT_B,
69  /*ANT_B -> */ ANT_C,
70  /*ANT_AB -> */ ANT_BC,
71  /*ANT_C -> */ ANT_A,
72  /*ANT_AC -> */ ANT_AB,
73  /*ANT_BC -> */ ANT_AC,
74  /*ANT_ABC -> */ ANT_ABC,
75 };
76 
77 #define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np) \
78  [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
79  IWL_RATE_SISO_##s##M_PLCP, \
80  IWL_RATE_MIMO2_##s##M_PLCP,\
81  IWL_RATE_MIMO3_##s##M_PLCP,\
82  IWL_RATE_##r##M_IEEE, \
83  IWL_RATE_##ip##M_INDEX, \
84  IWL_RATE_##in##M_INDEX, \
85  IWL_RATE_##rp##M_INDEX, \
86  IWL_RATE_##rn##M_INDEX, \
87  IWL_RATE_##pp##M_INDEX, \
88  IWL_RATE_##np##M_INDEX }
89 
90 /*
91  * Parameter order:
92  * rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
93  *
94  * If there isn't a valid next or previous rate then INV is used which
95  * maps to IWL_RATE_INVALID
96  *
97  */
98 const struct iwl_rate_info iwl_rates[IWL_RATE_COUNT] = {
99  IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2), /* 1mbps */
100  IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5), /* 2mbps */
101  IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11), /*5.5mbps */
102  IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18), /* 11mbps */
103  IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11), /* 6mbps */
104  IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11), /* 9mbps */
105  IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18), /* 12mbps */
106  IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24), /* 18mbps */
107  IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36), /* 24mbps */
108  IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48), /* 36mbps */
109  IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54), /* 48mbps */
110  IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
111  IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
112  /* FIXME:RS: ^^ should be INV (legacy) */
113 };
114 
115 static inline u8 rs_extract_rate(u32 rate_n_flags)
116 {
117  return (u8)(rate_n_flags & RATE_MCS_RATE_MSK);
118 }
119 
120 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
121 {
122  int idx = 0;
123 
124  /* HT rate format */
125  if (rate_n_flags & RATE_MCS_HT_MSK) {
126  idx = rs_extract_rate(rate_n_flags);
127 
128  if (idx >= IWL_RATE_MIMO3_6M_PLCP)
129  idx = idx - IWL_RATE_MIMO3_6M_PLCP;
130  else if (idx >= IWL_RATE_MIMO2_6M_PLCP)
131  idx = idx - IWL_RATE_MIMO2_6M_PLCP;
132 
133  idx += IWL_FIRST_OFDM_RATE;
134  /* skip 9M not supported in ht*/
135  if (idx >= IWL_RATE_9M_INDEX)
136  idx += 1;
137  if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE))
138  return idx;
139 
140  /* legacy rate format, search for match in table */
141  } else {
142  for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
143  if (iwl_rates[idx].plcp ==
144  rs_extract_rate(rate_n_flags))
145  return idx;
146  }
147 
148  return -1;
149 }
150 
151 static void rs_rate_scale_perform(struct iwl_priv *priv,
152  struct sk_buff *skb,
153  struct ieee80211_sta *sta,
154  struct iwl_lq_sta *lq_sta);
155 static void rs_fill_link_cmd(struct iwl_priv *priv,
156  struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
157 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
158 
159 
160 #ifdef CONFIG_MAC80211_DEBUGFS
161 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
162  u32 *rate_n_flags, int index);
163 #else
164 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
165  u32 *rate_n_flags, int index)
166 {}
167 #endif
168 
180 static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
181  7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
182 };
183 
184 static s32 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
185  {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202}, /* Norm */
186  {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210}, /* SGI */
187  {0, 0, 0, 0, 47, 0, 91, 133, 171, 242, 305, 334, 362}, /* AGG */
188  {0, 0, 0, 0, 52, 0, 101, 145, 187, 264, 330, 361, 390}, /* AGG+SGI */
189 };
190 
191 static s32 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
192  {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
193  {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
194  {0, 0, 0, 0, 94, 0, 177, 249, 313, 423, 512, 550, 586}, /* AGG */
195  {0, 0, 0, 0, 104, 0, 193, 270, 338, 454, 545, 584, 620}, /* AGG+SGI */
196 };
197 
198 static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
199  {0, 0, 0, 0, 74, 0, 123, 155, 179, 214, 236, 244, 251}, /* Norm */
200  {0, 0, 0, 0, 81, 0, 131, 164, 188, 223, 243, 251, 257}, /* SGI */
201  {0, 0, 0, 0, 89, 0, 167, 235, 296, 402, 488, 526, 560}, /* AGG */
202  {0, 0, 0, 0, 97, 0, 182, 255, 320, 431, 520, 558, 593}, /* AGG+SGI*/
203 };
204 
205 static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
206  {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
207  {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
208  {0, 0, 0, 0, 171, 0, 305, 410, 496, 634, 731, 771, 805}, /* AGG */
209  {0, 0, 0, 0, 186, 0, 329, 439, 527, 667, 764, 803, 838}, /* AGG+SGI */
210 };
211 
212 static s32 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = {
213  {0, 0, 0, 0, 99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */
214  {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */
215  {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */
216  {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */
217 };
218 
219 static s32 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = {
220  {0, 0, 0, 0, 152, 0, 211, 239, 255, 279, 290, 294, 297}, /* Norm */
221  {0, 0, 0, 0, 160, 0, 219, 245, 261, 284, 294, 297, 300}, /* SGI */
222  {0, 0, 0, 0, 254, 0, 443, 584, 695, 868, 984, 1030, 1070}, /* AGG */
223  {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */
224 };
225 
226 /* mbps, mcs */
227 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
228  { "1", "BPSK DSSS"},
229  { "2", "QPSK DSSS"},
230  {"5.5", "BPSK CCK"},
231  { "11", "QPSK CCK"},
232  { "6", "BPSK 1/2"},
233  { "9", "BPSK 1/2"},
234  { "12", "QPSK 1/2"},
235  { "18", "QPSK 3/4"},
236  { "24", "16QAM 1/2"},
237  { "36", "16QAM 3/4"},
238  { "48", "64QAM 2/3"},
239  { "54", "64QAM 3/4"},
240  { "60", "64QAM 5/6"},
241 };
242 
243 #define MCS_INDEX_PER_STREAM (8)
244 
245 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
246 {
247  window->data = 0;
248  window->success_counter = 0;
249  window->success_ratio = IWL_INVALID_VALUE;
250  window->counter = 0;
251  window->average_tpt = IWL_INVALID_VALUE;
252  window->stamp = 0;
253 }
254 
255 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
256 {
257  return (ant_type & valid_antenna) == ant_type;
258 }
259 
260 /*
261  * removes the old data from the statistics. All data that is older than
262  * TID_MAX_TIME_DIFF, will be deleted.
263  */
264 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
265 {
266  /* The oldest age we want to keep */
267  u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
268 
269  while (tl->queue_count &&
270  (tl->time_stamp < oldest_time)) {
271  tl->total -= tl->packet_count[tl->head];
272  tl->packet_count[tl->head] = 0;
273  tl->time_stamp += TID_QUEUE_CELL_SPACING;
274  tl->queue_count--;
275  tl->head++;
276  if (tl->head >= TID_QUEUE_MAX_SIZE)
277  tl->head = 0;
278  }
279 }
280 
281 /*
282  * increment traffic load value for tid and also remove
283  * any old values if passed the certain time period
284  */
285 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
286  struct ieee80211_hdr *hdr)
287 {
288  u32 curr_time = jiffies_to_msecs(jiffies);
289  u32 time_diff;
290  s32 index;
291  struct iwl_traffic_load *tl = NULL;
292  u8 tid;
293 
294  if (ieee80211_is_data_qos(hdr->frame_control)) {
295  u8 *qc = ieee80211_get_qos_ctl(hdr);
296  tid = qc[0] & 0xf;
297  } else
298  return IWL_MAX_TID_COUNT;
299 
300  if (unlikely(tid >= IWL_MAX_TID_COUNT))
301  return IWL_MAX_TID_COUNT;
302 
303  tl = &lq_data->load[tid];
304 
305  curr_time -= curr_time % TID_ROUND_VALUE;
306 
307  /* Happens only for the first packet. Initialize the data */
308  if (!(tl->queue_count)) {
309  tl->total = 1;
310  tl->time_stamp = curr_time;
311  tl->queue_count = 1;
312  tl->head = 0;
313  tl->packet_count[0] = 1;
314  return IWL_MAX_TID_COUNT;
315  }
316 
317  time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
318  index = time_diff / TID_QUEUE_CELL_SPACING;
319 
320  /* The history is too long: remove data that is older than */
321  /* TID_MAX_TIME_DIFF */
322  if (index >= TID_QUEUE_MAX_SIZE)
323  rs_tl_rm_old_stats(tl, curr_time);
324 
325  index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
326  tl->packet_count[index] = tl->packet_count[index] + 1;
327  tl->total = tl->total + 1;
328 
329  if ((index + 1) > tl->queue_count)
330  tl->queue_count = index + 1;
331 
332  return tid;
333 }
334 
335 #ifdef CONFIG_MAC80211_DEBUGFS
336 
342 static void rs_program_fix_rate(struct iwl_priv *priv,
343  struct iwl_lq_sta *lq_sta)
344 {
345  struct iwl_station_priv *sta_priv =
346  container_of(lq_sta, struct iwl_station_priv, lq_sta);
347  struct iwl_rxon_context *ctx = sta_priv->ctx;
348 
349  lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
350  lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
351  lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
352  lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
353 
354 #ifdef CONFIG_IWLWIFI_DEVICE_TESTMODE
355  /* testmode has higher priority to overwirte the fixed rate */
356  if (priv->tm_fixed_rate)
357  lq_sta->dbg_fixed_rate = priv->tm_fixed_rate;
358 #endif
359 
360  IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
361  lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
362 
363  if (lq_sta->dbg_fixed_rate) {
364  rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
365  iwl_send_lq_cmd(lq_sta->drv, ctx, &lq_sta->lq, CMD_ASYNC,
366  false);
367  }
368 }
369 #endif
370 
371 /*
372  get the traffic load value for tid
373 */
374 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
375 {
376  u32 curr_time = jiffies_to_msecs(jiffies);
377  u32 time_diff;
378  s32 index;
379  struct iwl_traffic_load *tl = NULL;
380 
381  if (tid >= IWL_MAX_TID_COUNT)
382  return 0;
383 
384  tl = &(lq_data->load[tid]);
385 
386  curr_time -= curr_time % TID_ROUND_VALUE;
387 
388  if (!(tl->queue_count))
389  return 0;
390 
391  time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
392  index = time_diff / TID_QUEUE_CELL_SPACING;
393 
394  /* The history is too long: remove data that is older than */
395  /* TID_MAX_TIME_DIFF */
396  if (index >= TID_QUEUE_MAX_SIZE)
397  rs_tl_rm_old_stats(tl, curr_time);
398 
399  return tl->total;
400 }
401 
402 static int rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
403  struct iwl_lq_sta *lq_data, u8 tid,
404  struct ieee80211_sta *sta)
405 {
406  int ret = -EAGAIN;
407  u32 load;
408 
409  /*
410  * Don't create TX aggregation sessions when in high
411  * BT traffic, as they would just be disrupted by BT.
412  */
413  if (priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) {
414  IWL_ERR(priv, "BT traffic (%d), no aggregation allowed\n",
415  priv->bt_traffic_load);
416  return ret;
417  }
418 
419  load = rs_tl_get_load(lq_data, tid);
420 
421  if ((iwlwifi_mod_params.auto_agg) || (load > IWL_AGG_LOAD_THRESHOLD)) {
422  IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
423  sta->addr, tid);
424  ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
425  if (ret == -EAGAIN) {
426  /*
427  * driver and mac80211 is out of sync
428  * this might be cause by reloading firmware
429  * stop the tx ba session here
430  */
431  IWL_ERR(priv, "Fail start Tx agg on tid: %d\n",
432  tid);
433  ieee80211_stop_tx_ba_session(sta, tid);
434  }
435  } else {
436  IWL_DEBUG_HT(priv, "Aggregation not enabled for tid %d "
437  "because load = %u\n", tid, load);
438  }
439  return ret;
440 }
441 
442 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
443  struct iwl_lq_sta *lq_data,
444  struct ieee80211_sta *sta)
445 {
446  if (tid < IWL_MAX_TID_COUNT)
447  rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
448  else
449  IWL_ERR(priv, "tid exceeds max TID count: %d/%d\n",
450  tid, IWL_MAX_TID_COUNT);
451 }
452 
453 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
454 {
455  return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
456  !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
457  !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
458 }
459 
460 /*
461  * Static function to get the expected throughput from an iwl_scale_tbl_info
462  * that wraps a NULL pointer check
463  */
464 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
465 {
466  if (tbl->expected_tpt)
467  return tbl->expected_tpt[rs_index];
468  return 0;
469 }
470 
478 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
479  int scale_index, int attempts, int successes)
480 {
481  struct iwl_rate_scale_data *window = NULL;
482  static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
483  s32 fail_count, tpt;
484 
485  if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
486  return -EINVAL;
487 
488  /* Select window for current tx bit rate */
489  window = &(tbl->win[scale_index]);
490 
491  /* Get expected throughput */
492  tpt = get_expected_tpt(tbl, scale_index);
493 
494  /*
495  * Keep track of only the latest 62 tx frame attempts in this rate's
496  * history window; anything older isn't really relevant any more.
497  * If we have filled up the sliding window, drop the oldest attempt;
498  * if the oldest attempt (highest bit in bitmap) shows "success",
499  * subtract "1" from the success counter (this is the main reason
500  * we keep these bitmaps!).
501  */
502  while (attempts > 0) {
503  if (window->counter >= IWL_RATE_MAX_WINDOW) {
504 
505  /* remove earliest */
506  window->counter = IWL_RATE_MAX_WINDOW - 1;
507 
508  if (window->data & mask) {
509  window->data &= ~mask;
510  window->success_counter--;
511  }
512  }
513 
514  /* Increment frames-attempted counter */
515  window->counter++;
516 
517  /* Shift bitmap by one frame to throw away oldest history */
518  window->data <<= 1;
519 
520  /* Mark the most recent #successes attempts as successful */
521  if (successes > 0) {
522  window->success_counter++;
523  window->data |= 0x1;
524  successes--;
525  }
526 
527  attempts--;
528  }
529 
530  /* Calculate current success ratio, avoid divide-by-0! */
531  if (window->counter > 0)
532  window->success_ratio = 128 * (100 * window->success_counter)
533  / window->counter;
534  else
535  window->success_ratio = IWL_INVALID_VALUE;
536 
537  fail_count = window->counter - window->success_counter;
538 
539  /* Calculate average throughput, if we have enough history. */
540  if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
541  (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
542  window->average_tpt = (window->success_ratio * tpt + 64) / 128;
543  else
544  window->average_tpt = IWL_INVALID_VALUE;
545 
546  /* Tag this window as having been updated */
547  window->stamp = jiffies;
548 
549  return 0;
550 }
551 
552 /*
553  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
554  */
555 /* FIXME:RS:remove this function and put the flags statically in the table */
556 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
557  struct iwl_scale_tbl_info *tbl,
558  int index, u8 use_green)
559 {
560  u32 rate_n_flags = 0;
561 
562  if (is_legacy(tbl->lq_type)) {
563  rate_n_flags = iwl_rates[index].plcp;
564  if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
565  rate_n_flags |= RATE_MCS_CCK_MSK;
566 
567  } else if (is_Ht(tbl->lq_type)) {
568  if (index > IWL_LAST_OFDM_RATE) {
569  IWL_ERR(priv, "Invalid HT rate index %d\n", index);
570  index = IWL_LAST_OFDM_RATE;
571  }
572  rate_n_flags = RATE_MCS_HT_MSK;
573 
574  if (is_siso(tbl->lq_type))
575  rate_n_flags |= iwl_rates[index].plcp_siso;
576  else if (is_mimo2(tbl->lq_type))
577  rate_n_flags |= iwl_rates[index].plcp_mimo2;
578  else
579  rate_n_flags |= iwl_rates[index].plcp_mimo3;
580  } else {
581  IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
582  }
583 
584  rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
585  RATE_MCS_ANT_ABC_MSK);
586 
587  if (is_Ht(tbl->lq_type)) {
588  if (tbl->is_ht40) {
589  if (tbl->is_dup)
590  rate_n_flags |= RATE_MCS_DUP_MSK;
591  else
592  rate_n_flags |= RATE_MCS_HT40_MSK;
593  }
594  if (tbl->is_SGI)
595  rate_n_flags |= RATE_MCS_SGI_MSK;
596 
597  if (use_green) {
598  rate_n_flags |= RATE_MCS_GF_MSK;
599  if (is_siso(tbl->lq_type) && tbl->is_SGI) {
600  rate_n_flags &= ~RATE_MCS_SGI_MSK;
601  IWL_ERR(priv, "GF was set with SGI:SISO\n");
602  }
603  }
604  }
605  return rate_n_flags;
606 }
607 
608 /*
609  * Interpret uCode API's rate_n_flags format,
610  * fill "search" or "active" tx mode table.
611  */
612 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
613  enum ieee80211_band band,
614  struct iwl_scale_tbl_info *tbl,
615  int *rate_idx)
616 {
617  u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
618  u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
619  u8 mcs;
620 
621  memset(tbl, 0, sizeof(struct iwl_scale_tbl_info));
622  *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
623 
624  if (*rate_idx == IWL_RATE_INVALID) {
625  *rate_idx = -1;
626  return -EINVAL;
627  }
628  tbl->is_SGI = 0; /* default legacy setup */
629  tbl->is_ht40 = 0;
630  tbl->is_dup = 0;
631  tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
632  tbl->lq_type = LQ_NONE;
633  tbl->max_search = IWL_MAX_SEARCH;
634 
635  /* legacy rate format */
636  if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
637  if (num_of_ant == 1) {
638  if (band == IEEE80211_BAND_5GHZ)
639  tbl->lq_type = LQ_A;
640  else
641  tbl->lq_type = LQ_G;
642  }
643  /* HT rate format */
644  } else {
645  if (rate_n_flags & RATE_MCS_SGI_MSK)
646  tbl->is_SGI = 1;
647 
648  if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
649  (rate_n_flags & RATE_MCS_DUP_MSK))
650  tbl->is_ht40 = 1;
651 
652  if (rate_n_flags & RATE_MCS_DUP_MSK)
653  tbl->is_dup = 1;
654 
655  mcs = rs_extract_rate(rate_n_flags);
656 
657  /* SISO */
658  if (mcs <= IWL_RATE_SISO_60M_PLCP) {
659  if (num_of_ant == 1)
660  tbl->lq_type = LQ_SISO; /*else NONE*/
661  /* MIMO2 */
662  } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
663  if (num_of_ant == 2)
664  tbl->lq_type = LQ_MIMO2;
665  /* MIMO3 */
666  } else {
667  if (num_of_ant == 3) {
668  tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
669  tbl->lq_type = LQ_MIMO3;
670  }
671  }
672  }
673  return 0;
674 }
675 
676 /* switch to another antenna/antennas and return 1 */
677 /* if no other valid antenna found, return 0 */
678 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
679  struct iwl_scale_tbl_info *tbl)
680 {
681  u8 new_ant_type;
682 
683  if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
684  return 0;
685 
686  if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
687  return 0;
688 
689  new_ant_type = ant_toggle_lookup[tbl->ant_type];
690 
691  while ((new_ant_type != tbl->ant_type) &&
692  !rs_is_valid_ant(valid_ant, new_ant_type))
693  new_ant_type = ant_toggle_lookup[new_ant_type];
694 
695  if (new_ant_type == tbl->ant_type)
696  return 0;
697 
698  tbl->ant_type = new_ant_type;
699  *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
700  *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
701  return 1;
702 }
703 
708 static bool rs_use_green(struct ieee80211_sta *sta)
709 {
710  /*
711  * There's a bug somewhere in this code that causes the
712  * scaling to get stuck because GF+SGI can't be combined
713  * in SISO rates. Until we find that bug, disable GF, it
714  * has only limited benefit and we still interoperate with
715  * GF APs since we can always receive GF transmissions.
716  */
717  return false;
718 }
719 
727 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
728  struct ieee80211_hdr *hdr,
729  enum iwl_table_type rate_type)
730 {
731  if (is_legacy(rate_type)) {
732  return lq_sta->active_legacy_rate;
733  } else {
734  if (is_siso(rate_type))
735  return lq_sta->active_siso_rate;
736  else if (is_mimo2(rate_type))
737  return lq_sta->active_mimo2_rate;
738  else
739  return lq_sta->active_mimo3_rate;
740  }
741 }
742 
743 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
744  int rate_type)
745 {
746  u8 high = IWL_RATE_INVALID;
747  u8 low = IWL_RATE_INVALID;
748 
749  /* 802.11A or ht walks to the next literal adjacent rate in
750  * the rate table */
751  if (is_a_band(rate_type) || !is_legacy(rate_type)) {
752  int i;
753  u32 mask;
754 
755  /* Find the previous rate that is in the rate mask */
756  i = index - 1;
757  for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
758  if (rate_mask & mask) {
759  low = i;
760  break;
761  }
762  }
763 
764  /* Find the next rate that is in the rate mask */
765  i = index + 1;
766  for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
767  if (rate_mask & mask) {
768  high = i;
769  break;
770  }
771  }
772 
773  return (high << 8) | low;
774  }
775 
776  low = index;
777  while (low != IWL_RATE_INVALID) {
778  low = iwl_rates[low].prev_rs;
779  if (low == IWL_RATE_INVALID)
780  break;
781  if (rate_mask & (1 << low))
782  break;
783  IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
784  }
785 
786  high = index;
787  while (high != IWL_RATE_INVALID) {
788  high = iwl_rates[high].next_rs;
789  if (high == IWL_RATE_INVALID)
790  break;
791  if (rate_mask & (1 << high))
792  break;
793  IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
794  }
795 
796  return (high << 8) | low;
797 }
798 
799 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
800  struct iwl_scale_tbl_info *tbl,
801  u8 scale_index, u8 ht_possible)
802 {
803  s32 low;
804  u16 rate_mask;
805  u16 high_low;
806  u8 switch_to_legacy = 0;
807  u8 is_green = lq_sta->is_green;
808  struct iwl_priv *priv = lq_sta->drv;
809 
810  /* check if we need to switch from HT to legacy rates.
811  * assumption is that mandatory rates (1Mbps or 6Mbps)
812  * are always supported (spec demand) */
813  if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
814  switch_to_legacy = 1;
815  scale_index = rs_ht_to_legacy[scale_index];
816  if (lq_sta->band == IEEE80211_BAND_5GHZ)
817  tbl->lq_type = LQ_A;
818  else
819  tbl->lq_type = LQ_G;
820 
821  if (num_of_ant(tbl->ant_type) > 1)
822  tbl->ant_type =
823  first_antenna(priv->eeprom_data->valid_tx_ant);
824 
825  tbl->is_ht40 = 0;
826  tbl->is_SGI = 0;
827  tbl->max_search = IWL_MAX_SEARCH;
828  }
829 
830  rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
831 
832  /* Mask with station rate restriction */
833  if (is_legacy(tbl->lq_type)) {
834  /* supp_rates has no CCK bits in A mode */
835  if (lq_sta->band == IEEE80211_BAND_5GHZ)
836  rate_mask = (u16)(rate_mask &
837  (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
838  else
839  rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
840  }
841 
842  /* If we switched from HT to legacy, check current rate */
843  if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
844  low = scale_index;
845  goto out;
846  }
847 
848  high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
849  tbl->lq_type);
850  low = high_low & 0xff;
851 
852  if (low == IWL_RATE_INVALID)
853  low = scale_index;
854 
855 out:
856  return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
857 }
858 
859 /*
860  * Simple function to compare two rate scale table types
861  */
862 static bool table_type_matches(struct iwl_scale_tbl_info *a,
863  struct iwl_scale_tbl_info *b)
864 {
865  return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
866  (a->is_SGI == b->is_SGI);
867 }
868 
869 static void rs_bt_update_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
870  struct iwl_lq_sta *lq_sta)
871 {
872  struct iwl_scale_tbl_info *tbl;
873  bool full_concurrent = priv->bt_full_concurrent;
874 
875  if (priv->bt_ant_couple_ok) {
876  /*
877  * Is there a need to switch between
878  * full concurrency and 3-wire?
879  */
880  if (priv->bt_ci_compliance && priv->bt_ant_couple_ok)
881  full_concurrent = true;
882  else
883  full_concurrent = false;
884  }
885  if ((priv->bt_traffic_load != priv->last_bt_traffic_load) ||
886  (priv->bt_full_concurrent != full_concurrent)) {
887  priv->bt_full_concurrent = full_concurrent;
888  priv->last_bt_traffic_load = priv->bt_traffic_load;
889 
890  /* Update uCode's rate table. */
891  tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
892  rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
893  iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
894 
895  queue_work(priv->workqueue, &priv->bt_full_concurrency);
896  }
897 }
898 
899 /*
900  * mac80211 sends us Tx status
901  */
902 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
903  struct ieee80211_sta *sta, void *priv_sta,
904  struct sk_buff *skb)
905 {
906  int legacy_success;
907  int retries;
908  int rs_index, mac_index, i;
909  struct iwl_lq_sta *lq_sta = priv_sta;
910  struct iwl_link_quality_cmd *table;
911  struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
912  struct iwl_op_mode *op_mode = (struct iwl_op_mode *)priv_r;
913  struct iwl_priv *priv = IWL_OP_MODE_GET_DVM(op_mode);
914  struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
915  enum mac80211_rate_control_flags mac_flags;
916  u32 tx_rate;
917  struct iwl_scale_tbl_info tbl_type;
918  struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
919  struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
920  struct iwl_rxon_context *ctx = sta_priv->ctx;
921 
922  IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
923 
924  /* Treat uninitialized rate scaling data same as non-existing. */
925  if (!lq_sta) {
926  IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n");
927  return;
928  } else if (!lq_sta->drv) {
929  IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
930  return;
931  }
932 
933  if (!ieee80211_is_data(hdr->frame_control) ||
934  info->flags & IEEE80211_TX_CTL_NO_ACK)
935  return;
936 
937  /* This packet was aggregated but doesn't carry status info */
938  if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
939  !(info->flags & IEEE80211_TX_STAT_AMPDU))
940  return;
941 
942  /*
943  * Ignore this Tx frame response if its initial rate doesn't match
944  * that of latest Link Quality command. There may be stragglers
945  * from a previous Link Quality command, but we're no longer interested
946  * in those; they're either from the "active" mode while we're trying
947  * to check "search" mode, or a prior "search" mode after we've moved
948  * to a new "search" mode (which might become the new "active" mode).
949  */
950  table = &lq_sta->lq;
951  tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
952  rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
953  if (priv->band == IEEE80211_BAND_5GHZ)
954  rs_index -= IWL_FIRST_OFDM_RATE;
955  mac_flags = info->status.rates[0].flags;
956  mac_index = info->status.rates[0].idx;
957  /* For HT packets, map MCS to PLCP */
958  if (mac_flags & IEEE80211_TX_RC_MCS) {
959  mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
960  if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
961  mac_index++;
962  /*
963  * mac80211 HT index is always zero-indexed; we need to move
964  * HT OFDM rates after CCK rates in 2.4 GHz band
965  */
966  if (priv->band == IEEE80211_BAND_2GHZ)
967  mac_index += IWL_FIRST_OFDM_RATE;
968  }
969  /* Here we actually compare this rate to the latest LQ command */
970  if ((mac_index < 0) ||
971  (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
972  (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
973  (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
974  (tbl_type.ant_type != info->status.antenna) ||
975  (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
976  (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
977  (rs_index != mac_index)) {
978  IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate);
979  /*
980  * Since rates mis-match, the last LQ command may have failed.
981  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
982  * ... driver.
983  */
984  lq_sta->missed_rate_counter++;
985  if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
986  lq_sta->missed_rate_counter = 0;
987  iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
988  }
989  /* Regardless, ignore this status info for outdated rate */
990  return;
991  } else
992  /* Rate did match, so reset the missed_rate_counter */
993  lq_sta->missed_rate_counter = 0;
994 
995  /* Figure out if rate scale algorithm is in active or search table */
996  if (table_type_matches(&tbl_type,
997  &(lq_sta->lq_info[lq_sta->active_tbl]))) {
998  curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
999  other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1000  } else if (table_type_matches(&tbl_type,
1001  &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
1002  curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1003  other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1004  } else {
1005  IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n");
1006  tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1007  IWL_DEBUG_RATE(priv, "active- lq:%x, ant:%x, SGI:%d\n",
1008  tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
1009  tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1010  IWL_DEBUG_RATE(priv, "search- lq:%x, ant:%x, SGI:%d\n",
1011  tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
1012  IWL_DEBUG_RATE(priv, "actual- lq:%x, ant:%x, SGI:%d\n",
1013  tbl_type.lq_type, tbl_type.ant_type, tbl_type.is_SGI);
1014  /*
1015  * no matching table found, let's by-pass the data collection
1016  * and continue to perform rate scale to find the rate table
1017  */
1018  rs_stay_in_table(lq_sta, true);
1019  goto done;
1020  }
1021 
1022  /*
1023  * Updating the frame history depends on whether packets were
1024  * aggregated.
1025  *
1026  * For aggregation, all packets were transmitted at the same rate, the
1027  * first index into rate scale table.
1028  */
1029  if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1030  tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
1031  rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
1032  &rs_index);
1033  rs_collect_tx_data(curr_tbl, rs_index,
1034  info->status.ampdu_len,
1035  info->status.ampdu_ack_len);
1036 
1037  /* Update success/fail counts if not searching for new mode */
1038  if (lq_sta->stay_in_tbl) {
1039  lq_sta->total_success += info->status.ampdu_ack_len;
1040  lq_sta->total_failed += (info->status.ampdu_len -
1041  info->status.ampdu_ack_len);
1042  }
1043  } else {
1044  /*
1045  * For legacy, update frame history with for each Tx retry.
1046  */
1047  retries = info->status.rates[0].count - 1;
1048  /* HW doesn't send more than 15 retries */
1049  retries = min(retries, 15);
1050 
1051  /* The last transmission may have been successful */
1052  legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1053  /* Collect data for each rate used during failed TX attempts */
1054  for (i = 0; i <= retries; ++i) {
1055  tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
1056  rs_get_tbl_info_from_mcs(tx_rate, priv->band,
1057  &tbl_type, &rs_index);
1058  /*
1059  * Only collect stats if retried rate is in the same RS
1060  * table as active/search.
1061  */
1062  if (table_type_matches(&tbl_type, curr_tbl))
1063  tmp_tbl = curr_tbl;
1064  else if (table_type_matches(&tbl_type, other_tbl))
1065  tmp_tbl = other_tbl;
1066  else
1067  continue;
1068  rs_collect_tx_data(tmp_tbl, rs_index, 1,
1069  i < retries ? 0 : legacy_success);
1070  }
1071 
1072  /* Update success/fail counts if not searching for new mode */
1073  if (lq_sta->stay_in_tbl) {
1074  lq_sta->total_success += legacy_success;
1075  lq_sta->total_failed += retries + (1 - legacy_success);
1076  }
1077  }
1078  /* The last TX rate is cached in lq_sta; it's set in if/else above */
1079  lq_sta->last_rate_n_flags = tx_rate;
1080 done:
1081  /* See if there's a better rate or modulation mode to try. */
1082  if (sta && sta->supp_rates[sband->band])
1083  rs_rate_scale_perform(priv, skb, sta, lq_sta);
1084 
1085 #if defined(CONFIG_MAC80211_DEBUGFS) && defined(CONFIG_IWLWIFI_DEVICE_TESTMODE)
1086  if ((priv->tm_fixed_rate) &&
1087  (priv->tm_fixed_rate != lq_sta->dbg_fixed_rate))
1088  rs_program_fix_rate(priv, lq_sta);
1089 #endif
1090  if (priv->cfg->bt_params && priv->cfg->bt_params->advanced_bt_coexist)
1091  rs_bt_update_lq(priv, ctx, lq_sta);
1092 }
1093 
1094 /*
1095  * Begin a period of staying with a selected modulation mode.
1096  * Set "stay_in_tbl" flag to prevent any mode switches.
1097  * Set frame tx success limits according to legacy vs. high-throughput,
1098  * and reset overall (spanning all rates) tx success history statistics.
1099  * These control how long we stay using same modulation mode before
1100  * searching for a new mode.
1101  */
1102 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
1103  struct iwl_lq_sta *lq_sta)
1104 {
1105  IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
1106  lq_sta->stay_in_tbl = 1; /* only place this gets set */
1107  if (is_legacy) {
1108  lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1109  lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1110  lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1111  } else {
1112  lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1113  lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1114  lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1115  }
1116  lq_sta->table_count = 0;
1117  lq_sta->total_failed = 0;
1118  lq_sta->total_success = 0;
1119  lq_sta->flush_timer = jiffies;
1120  lq_sta->action_counter = 0;
1121 }
1122 
1123 /*
1124  * Find correct throughput table for given mode of modulation
1125  */
1126 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1127  struct iwl_scale_tbl_info *tbl)
1128 {
1129  /* Used to choose among HT tables */
1130  s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1131 
1132  /* Check for invalid LQ type */
1133  if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1134  tbl->expected_tpt = expected_tpt_legacy;
1135  return;
1136  }
1137 
1138  /* Legacy rates have only one table */
1139  if (is_legacy(tbl->lq_type)) {
1140  tbl->expected_tpt = expected_tpt_legacy;
1141  return;
1142  }
1143 
1144  /* Choose among many HT tables depending on number of streams
1145  * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
1146  * status */
1147  if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1148  ht_tbl_pointer = expected_tpt_siso20MHz;
1149  else if (is_siso(tbl->lq_type))
1150  ht_tbl_pointer = expected_tpt_siso40MHz;
1151  else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1152  ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1153  else if (is_mimo2(tbl->lq_type))
1154  ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1155  else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1156  ht_tbl_pointer = expected_tpt_mimo3_20MHz;
1157  else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
1158  ht_tbl_pointer = expected_tpt_mimo3_40MHz;
1159 
1160  if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */
1161  tbl->expected_tpt = ht_tbl_pointer[0];
1162  else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */
1163  tbl->expected_tpt = ht_tbl_pointer[1];
1164  else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */
1165  tbl->expected_tpt = ht_tbl_pointer[2];
1166  else /* AGG+SGI */
1167  tbl->expected_tpt = ht_tbl_pointer[3];
1168 }
1169 
1170 /*
1171  * Find starting rate for new "search" high-throughput mode of modulation.
1172  * Goal is to find lowest expected rate (under perfect conditions) that is
1173  * above the current measured throughput of "active" mode, to give new mode
1174  * a fair chance to prove itself without too many challenges.
1175  *
1176  * This gets called when transitioning to more aggressive modulation
1177  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1178  * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1179  * to decrease to match "active" throughput. When moving from MIMO to SISO,
1180  * bit rate will typically need to increase, but not if performance was bad.
1181  */
1182 static s32 rs_get_best_rate(struct iwl_priv *priv,
1183  struct iwl_lq_sta *lq_sta,
1184  struct iwl_scale_tbl_info *tbl, /* "search" */
1185  u16 rate_mask, s8 index)
1186 {
1187  /* "active" values */
1188  struct iwl_scale_tbl_info *active_tbl =
1189  &(lq_sta->lq_info[lq_sta->active_tbl]);
1190  s32 active_sr = active_tbl->win[index].success_ratio;
1191  s32 active_tpt = active_tbl->expected_tpt[index];
1192 
1193  /* expected "search" throughput */
1194  s32 *tpt_tbl = tbl->expected_tpt;
1195 
1196  s32 new_rate, high, low, start_hi;
1197  u16 high_low;
1198  s8 rate = index;
1199 
1200  new_rate = high = low = start_hi = IWL_RATE_INVALID;
1201 
1202  for (; ;) {
1203  high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1204  tbl->lq_type);
1205 
1206  low = high_low & 0xff;
1207  high = (high_low >> 8) & 0xff;
1208 
1209  /*
1210  * Lower the "search" bit rate, to give new "search" mode
1211  * approximately the same throughput as "active" if:
1212  *
1213  * 1) "Active" mode has been working modestly well (but not
1214  * great), and expected "search" throughput (under perfect
1215  * conditions) at candidate rate is above the actual
1216  * measured "active" throughput (but less than expected
1217  * "active" throughput under perfect conditions).
1218  * OR
1219  * 2) "Active" mode has been working perfectly or very well
1220  * and expected "search" throughput (under perfect
1221  * conditions) at candidate rate is above expected
1222  * "active" throughput (under perfect conditions).
1223  */
1224  if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1225  ((active_sr > IWL_RATE_DECREASE_TH) &&
1226  (active_sr <= IWL_RATE_HIGH_TH) &&
1227  (tpt_tbl[rate] <= active_tpt))) ||
1228  ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1229  (tpt_tbl[rate] > active_tpt))) {
1230 
1231  /* (2nd or later pass)
1232  * If we've already tried to raise the rate, and are
1233  * now trying to lower it, use the higher rate. */
1234  if (start_hi != IWL_RATE_INVALID) {
1235  new_rate = start_hi;
1236  break;
1237  }
1238 
1239  new_rate = rate;
1240 
1241  /* Loop again with lower rate */
1242  if (low != IWL_RATE_INVALID)
1243  rate = low;
1244 
1245  /* Lower rate not available, use the original */
1246  else
1247  break;
1248 
1249  /* Else try to raise the "search" rate to match "active" */
1250  } else {
1251  /* (2nd or later pass)
1252  * If we've already tried to lower the rate, and are
1253  * now trying to raise it, use the lower rate. */
1254  if (new_rate != IWL_RATE_INVALID)
1255  break;
1256 
1257  /* Loop again with higher rate */
1258  else if (high != IWL_RATE_INVALID) {
1259  start_hi = high;
1260  rate = high;
1261 
1262  /* Higher rate not available, use the original */
1263  } else {
1264  new_rate = rate;
1265  break;
1266  }
1267  }
1268  }
1269 
1270  return new_rate;
1271 }
1272 
1273 /*
1274  * Set up search table for MIMO2
1275  */
1276 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1277  struct iwl_lq_sta *lq_sta,
1278  struct ieee80211_conf *conf,
1279  struct ieee80211_sta *sta,
1280  struct iwl_scale_tbl_info *tbl, int index)
1281 {
1282  u16 rate_mask;
1283  s32 rate;
1284  s8 is_green = lq_sta->is_green;
1285  struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1286  struct iwl_rxon_context *ctx = sta_priv->ctx;
1287 
1288  if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1289  return -1;
1290 
1291  if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1292  == WLAN_HT_CAP_SM_PS_STATIC)
1293  return -1;
1294 
1295  /* Need both Tx chains/antennas to support MIMO */
1296  if (priv->hw_params.tx_chains_num < 2)
1297  return -1;
1298 
1299  IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1300 
1301  tbl->lq_type = LQ_MIMO2;
1302  tbl->is_dup = lq_sta->is_dup;
1303  tbl->action = 0;
1304  tbl->max_search = IWL_MAX_SEARCH;
1305  rate_mask = lq_sta->active_mimo2_rate;
1306 
1307  if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1308  tbl->is_ht40 = 1;
1309  else
1310  tbl->is_ht40 = 0;
1311 
1312  rs_set_expected_tpt_table(lq_sta, tbl);
1313 
1314  rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1315 
1316  IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1317  if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1318  IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1319  rate, rate_mask);
1320  return -1;
1321  }
1322  tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1323 
1324  IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1325  tbl->current_rate, is_green);
1326  return 0;
1327 }
1328 
1329 /*
1330  * Set up search table for MIMO3
1331  */
1332 static int rs_switch_to_mimo3(struct iwl_priv *priv,
1333  struct iwl_lq_sta *lq_sta,
1334  struct ieee80211_conf *conf,
1335  struct ieee80211_sta *sta,
1336  struct iwl_scale_tbl_info *tbl, int index)
1337 {
1338  u16 rate_mask;
1339  s32 rate;
1340  s8 is_green = lq_sta->is_green;
1341  struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1342  struct iwl_rxon_context *ctx = sta_priv->ctx;
1343 
1344  if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1345  return -1;
1346 
1347  if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1348  == WLAN_HT_CAP_SM_PS_STATIC)
1349  return -1;
1350 
1351  /* Need both Tx chains/antennas to support MIMO */
1352  if (priv->hw_params.tx_chains_num < 3)
1353  return -1;
1354 
1355  IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1356 
1357  tbl->lq_type = LQ_MIMO3;
1358  tbl->is_dup = lq_sta->is_dup;
1359  tbl->action = 0;
1360  tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1361  rate_mask = lq_sta->active_mimo3_rate;
1362 
1363  if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1364  tbl->is_ht40 = 1;
1365  else
1366  tbl->is_ht40 = 0;
1367 
1368  rs_set_expected_tpt_table(lq_sta, tbl);
1369 
1370  rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1371 
1372  IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1373  rate, rate_mask);
1374  if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1375  IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1376  rate, rate_mask);
1377  return -1;
1378  }
1379  tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1380 
1381  IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1382  tbl->current_rate, is_green);
1383  return 0;
1384 }
1385 
1386 /*
1387  * Set up search table for SISO
1388  */
1389 static int rs_switch_to_siso(struct iwl_priv *priv,
1390  struct iwl_lq_sta *lq_sta,
1391  struct ieee80211_conf *conf,
1392  struct ieee80211_sta *sta,
1393  struct iwl_scale_tbl_info *tbl, int index)
1394 {
1395  u16 rate_mask;
1396  u8 is_green = lq_sta->is_green;
1397  s32 rate;
1398  struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1399  struct iwl_rxon_context *ctx = sta_priv->ctx;
1400 
1401  if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1402  return -1;
1403 
1404  IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1405 
1406  tbl->is_dup = lq_sta->is_dup;
1407  tbl->lq_type = LQ_SISO;
1408  tbl->action = 0;
1409  tbl->max_search = IWL_MAX_SEARCH;
1410  rate_mask = lq_sta->active_siso_rate;
1411 
1412  if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1413  tbl->is_ht40 = 1;
1414  else
1415  tbl->is_ht40 = 0;
1416 
1417  if (is_green)
1418  tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1419 
1420  rs_set_expected_tpt_table(lq_sta, tbl);
1421  rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1422 
1423  IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1424  if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1425  IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1426  rate, rate_mask);
1427  return -1;
1428  }
1429  tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1430  IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1431  tbl->current_rate, is_green);
1432  return 0;
1433 }
1434 
1435 /*
1436  * Try to switch to new modulation mode from legacy
1437  */
1438 static int rs_move_legacy_other(struct iwl_priv *priv,
1439  struct iwl_lq_sta *lq_sta,
1440  struct ieee80211_conf *conf,
1441  struct ieee80211_sta *sta,
1442  int index)
1443 {
1444  struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1445  struct iwl_scale_tbl_info *search_tbl =
1446  &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1447  struct iwl_rate_scale_data *window = &(tbl->win[index]);
1448  u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1449  (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1450  u8 start_action;
1451  u8 valid_tx_ant = priv->eeprom_data->valid_tx_ant;
1452  u8 tx_chains_num = priv->hw_params.tx_chains_num;
1453  int ret = 0;
1454  u8 update_search_tbl_counter = 0;
1455 
1456  switch (priv->bt_traffic_load) {
1457  case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1458  /* nothing */
1459  break;
1460  case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1461  /* avoid antenna B unless MIMO */
1462  if (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2)
1463  tbl->action = IWL_LEGACY_SWITCH_SISO;
1464  break;
1465  case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1466  case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1467  /* avoid antenna B and MIMO */
1468  valid_tx_ant =
1469  first_antenna(priv->eeprom_data->valid_tx_ant);
1470  if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2 &&
1471  tbl->action != IWL_LEGACY_SWITCH_SISO)
1472  tbl->action = IWL_LEGACY_SWITCH_SISO;
1473  break;
1474  default:
1475  IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1476  break;
1477  }
1478 
1479  if (!iwl_ht_enabled(priv))
1480  /* stay in Legacy */
1481  tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1482  else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1483  tbl->action > IWL_LEGACY_SWITCH_SISO)
1484  tbl->action = IWL_LEGACY_SWITCH_SISO;
1485 
1486  /* configure as 1x1 if bt full concurrency */
1487  if (priv->bt_full_concurrent) {
1488  if (!iwl_ht_enabled(priv))
1489  tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1490  else if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1491  tbl->action = IWL_LEGACY_SWITCH_SISO;
1492  valid_tx_ant =
1493  first_antenna(priv->eeprom_data->valid_tx_ant);
1494  }
1495 
1496  start_action = tbl->action;
1497  for (; ;) {
1498  lq_sta->action_counter++;
1499  switch (tbl->action) {
1500  case IWL_LEGACY_SWITCH_ANTENNA1:
1501  case IWL_LEGACY_SWITCH_ANTENNA2:
1502  IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1503 
1504  if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1505  tx_chains_num <= 1) ||
1506  (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1507  tx_chains_num <= 2))
1508  break;
1509 
1510  /* Don't change antenna if success has been great */
1511  if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1512  !priv->bt_full_concurrent &&
1513  priv->bt_traffic_load ==
1514  IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1515  break;
1516 
1517  /* Set up search table to try other antenna */
1518  memcpy(search_tbl, tbl, sz);
1519 
1520  if (rs_toggle_antenna(valid_tx_ant,
1521  &search_tbl->current_rate, search_tbl)) {
1522  update_search_tbl_counter = 1;
1523  rs_set_expected_tpt_table(lq_sta, search_tbl);
1524  goto out;
1525  }
1526  break;
1527  case IWL_LEGACY_SWITCH_SISO:
1528  IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1529 
1530  /* Set up search table to try SISO */
1531  memcpy(search_tbl, tbl, sz);
1532  search_tbl->is_SGI = 0;
1533  ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1534  search_tbl, index);
1535  if (!ret) {
1536  lq_sta->action_counter = 0;
1537  goto out;
1538  }
1539 
1540  break;
1541  case IWL_LEGACY_SWITCH_MIMO2_AB:
1542  case IWL_LEGACY_SWITCH_MIMO2_AC:
1543  case IWL_LEGACY_SWITCH_MIMO2_BC:
1544  IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1545 
1546  /* Set up search table to try MIMO */
1547  memcpy(search_tbl, tbl, sz);
1548  search_tbl->is_SGI = 0;
1549 
1550  if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1551  search_tbl->ant_type = ANT_AB;
1552  else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1553  search_tbl->ant_type = ANT_AC;
1554  else
1555  search_tbl->ant_type = ANT_BC;
1556 
1557  if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1558  break;
1559 
1560  ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1561  search_tbl, index);
1562  if (!ret) {
1563  lq_sta->action_counter = 0;
1564  goto out;
1565  }
1566  break;
1567 
1568  case IWL_LEGACY_SWITCH_MIMO3_ABC:
1569  IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1570 
1571  /* Set up search table to try MIMO3 */
1572  memcpy(search_tbl, tbl, sz);
1573  search_tbl->is_SGI = 0;
1574 
1575  search_tbl->ant_type = ANT_ABC;
1576 
1577  if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1578  break;
1579 
1580  ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1581  search_tbl, index);
1582  if (!ret) {
1583  lq_sta->action_counter = 0;
1584  goto out;
1585  }
1586  break;
1587  }
1588  tbl->action++;
1589  if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1590  tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1591 
1592  if (tbl->action == start_action)
1593  break;
1594 
1595  }
1596  search_tbl->lq_type = LQ_NONE;
1597  return 0;
1598 
1599 out:
1600  lq_sta->search_better_tbl = 1;
1601  tbl->action++;
1602  if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1603  tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1604  if (update_search_tbl_counter)
1605  search_tbl->action = tbl->action;
1606  return 0;
1607 
1608 }
1609 
1610 /*
1611  * Try to switch to new modulation mode from SISO
1612  */
1613 static int rs_move_siso_to_other(struct iwl_priv *priv,
1614  struct iwl_lq_sta *lq_sta,
1615  struct ieee80211_conf *conf,
1616  struct ieee80211_sta *sta, int index)
1617 {
1618  u8 is_green = lq_sta->is_green;
1619  struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1620  struct iwl_scale_tbl_info *search_tbl =
1621  &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1622  struct iwl_rate_scale_data *window = &(tbl->win[index]);
1623  struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1624  u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1625  (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1626  u8 start_action;
1627  u8 valid_tx_ant = priv->eeprom_data->valid_tx_ant;
1628  u8 tx_chains_num = priv->hw_params.tx_chains_num;
1629  u8 update_search_tbl_counter = 0;
1630  int ret;
1631 
1632  switch (priv->bt_traffic_load) {
1633  case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1634  /* nothing */
1635  break;
1636  case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1637  /* avoid antenna B unless MIMO */
1638  if (tbl->action == IWL_SISO_SWITCH_ANTENNA2)
1639  tbl->action = IWL_SISO_SWITCH_MIMO2_AB;
1640  break;
1641  case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1642  case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1643  /* avoid antenna B and MIMO */
1644  valid_tx_ant =
1645  first_antenna(priv->eeprom_data->valid_tx_ant);
1646  if (tbl->action != IWL_SISO_SWITCH_ANTENNA1)
1647  tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1648  break;
1649  default:
1650  IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1651  break;
1652  }
1653 
1654  if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1655  tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1656  /* stay in SISO */
1657  tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1658  }
1659 
1660  /* configure as 1x1 if bt full concurrency */
1661  if (priv->bt_full_concurrent) {
1662  valid_tx_ant =
1663  first_antenna(priv->eeprom_data->valid_tx_ant);
1664  if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1665  tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1666  }
1667 
1668  start_action = tbl->action;
1669  for (;;) {
1670  lq_sta->action_counter++;
1671  switch (tbl->action) {
1672  case IWL_SISO_SWITCH_ANTENNA1:
1673  case IWL_SISO_SWITCH_ANTENNA2:
1674  IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1675  if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1676  tx_chains_num <= 1) ||
1677  (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1678  tx_chains_num <= 2))
1679  break;
1680 
1681  if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1682  !priv->bt_full_concurrent &&
1683  priv->bt_traffic_load ==
1684  IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1685  break;
1686 
1687  memcpy(search_tbl, tbl, sz);
1688  if (rs_toggle_antenna(valid_tx_ant,
1689  &search_tbl->current_rate, search_tbl)) {
1690  update_search_tbl_counter = 1;
1691  goto out;
1692  }
1693  break;
1694  case IWL_SISO_SWITCH_MIMO2_AB:
1695  case IWL_SISO_SWITCH_MIMO2_AC:
1696  case IWL_SISO_SWITCH_MIMO2_BC:
1697  IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1698  memcpy(search_tbl, tbl, sz);
1699  search_tbl->is_SGI = 0;
1700 
1701  if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1702  search_tbl->ant_type = ANT_AB;
1703  else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1704  search_tbl->ant_type = ANT_AC;
1705  else
1706  search_tbl->ant_type = ANT_BC;
1707 
1708  if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1709  break;
1710 
1711  ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1712  search_tbl, index);
1713  if (!ret)
1714  goto out;
1715  break;
1716  case IWL_SISO_SWITCH_GI:
1717  if (!tbl->is_ht40 && !(ht_cap->cap &
1718  IEEE80211_HT_CAP_SGI_20))
1719  break;
1720  if (tbl->is_ht40 && !(ht_cap->cap &
1721  IEEE80211_HT_CAP_SGI_40))
1722  break;
1723 
1724  IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1725 
1726  memcpy(search_tbl, tbl, sz);
1727  if (is_green) {
1728  if (!tbl->is_SGI)
1729  break;
1730  else
1731  IWL_ERR(priv,
1732  "SGI was set in GF+SISO\n");
1733  }
1734  search_tbl->is_SGI = !tbl->is_SGI;
1735  rs_set_expected_tpt_table(lq_sta, search_tbl);
1736  if (tbl->is_SGI) {
1737  s32 tpt = lq_sta->last_tpt / 100;
1738  if (tpt >= search_tbl->expected_tpt[index])
1739  break;
1740  }
1741  search_tbl->current_rate =
1742  rate_n_flags_from_tbl(priv, search_tbl,
1743  index, is_green);
1744  update_search_tbl_counter = 1;
1745  goto out;
1746  case IWL_SISO_SWITCH_MIMO3_ABC:
1747  IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1748  memcpy(search_tbl, tbl, sz);
1749  search_tbl->is_SGI = 0;
1750  search_tbl->ant_type = ANT_ABC;
1751 
1752  if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1753  break;
1754 
1755  ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1756  search_tbl, index);
1757  if (!ret)
1758  goto out;
1759  break;
1760  }
1761  tbl->action++;
1762  if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1763  tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1764 
1765  if (tbl->action == start_action)
1766  break;
1767  }
1768  search_tbl->lq_type = LQ_NONE;
1769  return 0;
1770 
1771  out:
1772  lq_sta->search_better_tbl = 1;
1773  tbl->action++;
1774  if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1775  tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1776  if (update_search_tbl_counter)
1777  search_tbl->action = tbl->action;
1778 
1779  return 0;
1780 }
1781 
1782 /*
1783  * Try to switch to new modulation mode from MIMO2
1784  */
1785 static int rs_move_mimo2_to_other(struct iwl_priv *priv,
1786  struct iwl_lq_sta *lq_sta,
1787  struct ieee80211_conf *conf,
1788  struct ieee80211_sta *sta, int index)
1789 {
1790  s8 is_green = lq_sta->is_green;
1791  struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1792  struct iwl_scale_tbl_info *search_tbl =
1793  &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1794  struct iwl_rate_scale_data *window = &(tbl->win[index]);
1795  struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1796  u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1797  (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1798  u8 start_action;
1799  u8 valid_tx_ant = priv->eeprom_data->valid_tx_ant;
1800  u8 tx_chains_num = priv->hw_params.tx_chains_num;
1801  u8 update_search_tbl_counter = 0;
1802  int ret;
1803 
1804  switch (priv->bt_traffic_load) {
1805  case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1806  /* nothing */
1807  break;
1808  case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1809  case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1810  /* avoid antenna B and MIMO */
1811  if (tbl->action != IWL_MIMO2_SWITCH_SISO_A)
1812  tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1813  break;
1814  case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1815  /* avoid antenna B unless MIMO */
1816  if (tbl->action == IWL_MIMO2_SWITCH_SISO_B ||
1817  tbl->action == IWL_MIMO2_SWITCH_SISO_C)
1818  tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1819  break;
1820  default:
1821  IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1822  break;
1823  }
1824 
1825  if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1826  (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1827  tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1828  /* switch in SISO */
1829  tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1830  }
1831 
1832  /* configure as 1x1 if bt full concurrency */
1833  if (priv->bt_full_concurrent &&
1834  (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1835  tbl->action > IWL_MIMO2_SWITCH_SISO_C))
1836  tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1837 
1838  start_action = tbl->action;
1839  for (;;) {
1840  lq_sta->action_counter++;
1841  switch (tbl->action) {
1842  case IWL_MIMO2_SWITCH_ANTENNA1:
1843  case IWL_MIMO2_SWITCH_ANTENNA2:
1844  IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1845 
1846  if (tx_chains_num <= 2)
1847  break;
1848 
1849  if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1850  break;
1851 
1852  memcpy(search_tbl, tbl, sz);
1853  if (rs_toggle_antenna(valid_tx_ant,
1854  &search_tbl->current_rate, search_tbl)) {
1855  update_search_tbl_counter = 1;
1856  goto out;
1857  }
1858  break;
1859  case IWL_MIMO2_SWITCH_SISO_A:
1860  case IWL_MIMO2_SWITCH_SISO_B:
1861  case IWL_MIMO2_SWITCH_SISO_C:
1862  IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1863 
1864  /* Set up new search table for SISO */
1865  memcpy(search_tbl, tbl, sz);
1866 
1867  if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1868  search_tbl->ant_type = ANT_A;
1869  else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1870  search_tbl->ant_type = ANT_B;
1871  else
1872  search_tbl->ant_type = ANT_C;
1873 
1874  if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1875  break;
1876 
1877  ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1878  search_tbl, index);
1879  if (!ret)
1880  goto out;
1881 
1882  break;
1883 
1884  case IWL_MIMO2_SWITCH_GI:
1885  if (!tbl->is_ht40 && !(ht_cap->cap &
1886  IEEE80211_HT_CAP_SGI_20))
1887  break;
1888  if (tbl->is_ht40 && !(ht_cap->cap &
1889  IEEE80211_HT_CAP_SGI_40))
1890  break;
1891 
1892  IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1893 
1894  /* Set up new search table for MIMO2 */
1895  memcpy(search_tbl, tbl, sz);
1896  search_tbl->is_SGI = !tbl->is_SGI;
1897  rs_set_expected_tpt_table(lq_sta, search_tbl);
1898  /*
1899  * If active table already uses the fastest possible
1900  * modulation (dual stream with short guard interval),
1901  * and it's working well, there's no need to look
1902  * for a better type of modulation!
1903  */
1904  if (tbl->is_SGI) {
1905  s32 tpt = lq_sta->last_tpt / 100;
1906  if (tpt >= search_tbl->expected_tpt[index])
1907  break;
1908  }
1909  search_tbl->current_rate =
1910  rate_n_flags_from_tbl(priv, search_tbl,
1911  index, is_green);
1912  update_search_tbl_counter = 1;
1913  goto out;
1914 
1915  case IWL_MIMO2_SWITCH_MIMO3_ABC:
1916  IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1917  memcpy(search_tbl, tbl, sz);
1918  search_tbl->is_SGI = 0;
1919  search_tbl->ant_type = ANT_ABC;
1920 
1921  if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1922  break;
1923 
1924  ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1925  search_tbl, index);
1926  if (!ret)
1927  goto out;
1928 
1929  break;
1930  }
1931  tbl->action++;
1932  if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1933  tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1934 
1935  if (tbl->action == start_action)
1936  break;
1937  }
1938  search_tbl->lq_type = LQ_NONE;
1939  return 0;
1940  out:
1941  lq_sta->search_better_tbl = 1;
1942  tbl->action++;
1943  if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1944  tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1945  if (update_search_tbl_counter)
1946  search_tbl->action = tbl->action;
1947 
1948  return 0;
1949 
1950 }
1951 
1952 /*
1953  * Try to switch to new modulation mode from MIMO3
1954  */
1955 static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1956  struct iwl_lq_sta *lq_sta,
1957  struct ieee80211_conf *conf,
1958  struct ieee80211_sta *sta, int index)
1959 {
1960  s8 is_green = lq_sta->is_green;
1961  struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1962  struct iwl_scale_tbl_info *search_tbl =
1963  &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1964  struct iwl_rate_scale_data *window = &(tbl->win[index]);
1965  struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1966  u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1967  (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1968  u8 start_action;
1969  u8 valid_tx_ant = priv->eeprom_data->valid_tx_ant;
1970  u8 tx_chains_num = priv->hw_params.tx_chains_num;
1971  int ret;
1972  u8 update_search_tbl_counter = 0;
1973 
1974  switch (priv->bt_traffic_load) {
1975  case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1976  /* nothing */
1977  break;
1978  case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1979  case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1980  /* avoid antenna B and MIMO */
1981  if (tbl->action != IWL_MIMO3_SWITCH_SISO_A)
1982  tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1983  break;
1984  case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1985  /* avoid antenna B unless MIMO */
1986  if (tbl->action == IWL_MIMO3_SWITCH_SISO_B ||
1987  tbl->action == IWL_MIMO3_SWITCH_SISO_C)
1988  tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1989  break;
1990  default:
1991  IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1992  break;
1993  }
1994 
1995  if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1996  (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1997  tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1998  /* switch in SISO */
1999  tbl->action = IWL_MIMO3_SWITCH_SISO_A;
2000  }
2001 
2002  /* configure as 1x1 if bt full concurrency */
2003  if (priv->bt_full_concurrent &&
2004  (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
2005  tbl->action > IWL_MIMO3_SWITCH_SISO_C))
2006  tbl->action = IWL_MIMO3_SWITCH_SISO_A;
2007 
2008  start_action = tbl->action;
2009  for (;;) {
2010  lq_sta->action_counter++;
2011  switch (tbl->action) {
2012  case IWL_MIMO3_SWITCH_ANTENNA1:
2013  case IWL_MIMO3_SWITCH_ANTENNA2:
2014  IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
2015 
2016  if (tx_chains_num <= 3)
2017  break;
2018 
2019  if (window->success_ratio >= IWL_RS_GOOD_RATIO)
2020  break;
2021 
2022  memcpy(search_tbl, tbl, sz);
2023  if (rs_toggle_antenna(valid_tx_ant,
2024  &search_tbl->current_rate, search_tbl))
2025  goto out;
2026  break;
2027  case IWL_MIMO3_SWITCH_SISO_A:
2028  case IWL_MIMO3_SWITCH_SISO_B:
2029  case IWL_MIMO3_SWITCH_SISO_C:
2030  IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
2031 
2032  /* Set up new search table for SISO */
2033  memcpy(search_tbl, tbl, sz);
2034 
2035  if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
2036  search_tbl->ant_type = ANT_A;
2037  else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
2038  search_tbl->ant_type = ANT_B;
2039  else
2040  search_tbl->ant_type = ANT_C;
2041 
2042  if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2043  break;
2044 
2045  ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
2046  search_tbl, index);
2047  if (!ret)
2048  goto out;
2049 
2050  break;
2051 
2052  case IWL_MIMO3_SWITCH_MIMO2_AB:
2053  case IWL_MIMO3_SWITCH_MIMO2_AC:
2054  case IWL_MIMO3_SWITCH_MIMO2_BC:
2055  IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
2056 
2057  memcpy(search_tbl, tbl, sz);
2058  search_tbl->is_SGI = 0;
2059  if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
2060  search_tbl->ant_type = ANT_AB;
2061  else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
2062  search_tbl->ant_type = ANT_AC;
2063  else
2064  search_tbl->ant_type = ANT_BC;
2065 
2066  if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2067  break;
2068 
2069  ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
2070  search_tbl, index);
2071  if (!ret)
2072  goto out;
2073 
2074  break;
2075 
2076  case IWL_MIMO3_SWITCH_GI:
2077  if (!tbl->is_ht40 && !(ht_cap->cap &
2078  IEEE80211_HT_CAP_SGI_20))
2079  break;
2080  if (tbl->is_ht40 && !(ht_cap->cap &
2081  IEEE80211_HT_CAP_SGI_40))
2082  break;
2083 
2084  IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
2085 
2086  /* Set up new search table for MIMO */
2087  memcpy(search_tbl, tbl, sz);
2088  search_tbl->is_SGI = !tbl->is_SGI;
2089  rs_set_expected_tpt_table(lq_sta, search_tbl);
2090  /*
2091  * If active table already uses the fastest possible
2092  * modulation (dual stream with short guard interval),
2093  * and it's working well, there's no need to look
2094  * for a better type of modulation!
2095  */
2096  if (tbl->is_SGI) {
2097  s32 tpt = lq_sta->last_tpt / 100;
2098  if (tpt >= search_tbl->expected_tpt[index])
2099  break;
2100  }
2101  search_tbl->current_rate =
2102  rate_n_flags_from_tbl(priv, search_tbl,
2103  index, is_green);
2104  update_search_tbl_counter = 1;
2105  goto out;
2106  }
2107  tbl->action++;
2108  if (tbl->action > IWL_MIMO3_SWITCH_GI)
2109  tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2110 
2111  if (tbl->action == start_action)
2112  break;
2113  }
2114  search_tbl->lq_type = LQ_NONE;
2115  return 0;
2116  out:
2117  lq_sta->search_better_tbl = 1;
2118  tbl->action++;
2119  if (tbl->action > IWL_MIMO3_SWITCH_GI)
2120  tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2121  if (update_search_tbl_counter)
2122  search_tbl->action = tbl->action;
2123 
2124  return 0;
2125 
2126 }
2127 
2128 /*
2129  * Check whether we should continue using same modulation mode, or
2130  * begin search for a new mode, based on:
2131  * 1) # tx successes or failures while using this mode
2132  * 2) # times calling this function
2133  * 3) elapsed time in this mode (not used, for now)
2134  */
2135 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
2136 {
2137  struct iwl_scale_tbl_info *tbl;
2138  int i;
2139  int active_tbl;
2140  int flush_interval_passed = 0;
2141  struct iwl_priv *priv;
2142 
2143  priv = lq_sta->drv;
2144  active_tbl = lq_sta->active_tbl;
2145 
2146  tbl = &(lq_sta->lq_info[active_tbl]);
2147 
2148  /* If we've been disallowing search, see if we should now allow it */
2149  if (lq_sta->stay_in_tbl) {
2150 
2151  /* Elapsed time using current modulation mode */
2152  if (lq_sta->flush_timer)
2153  flush_interval_passed =
2154  time_after(jiffies,
2155  (unsigned long)(lq_sta->flush_timer +
2156  IWL_RATE_SCALE_FLUSH_INTVL));
2157 
2158  /*
2159  * Check if we should allow search for new modulation mode.
2160  * If many frames have failed or succeeded, or we've used
2161  * this same modulation for a long time, allow search, and
2162  * reset history stats that keep track of whether we should
2163  * allow a new search. Also (below) reset all bitmaps and
2164  * stats in active history.
2165  */
2166  if (force_search ||
2167  (lq_sta->total_failed > lq_sta->max_failure_limit) ||
2168  (lq_sta->total_success > lq_sta->max_success_limit) ||
2169  ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
2170  && (flush_interval_passed))) {
2171  IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n",
2172  lq_sta->total_failed,
2173  lq_sta->total_success,
2174  flush_interval_passed);
2175 
2176  /* Allow search for new mode */
2177  lq_sta->stay_in_tbl = 0; /* only place reset */
2178  lq_sta->total_failed = 0;
2179  lq_sta->total_success = 0;
2180  lq_sta->flush_timer = 0;
2181 
2182  /*
2183  * Else if we've used this modulation mode enough repetitions
2184  * (regardless of elapsed time or success/failure), reset
2185  * history bitmaps and rate-specific stats for all rates in
2186  * active table.
2187  */
2188  } else {
2189  lq_sta->table_count++;
2190  if (lq_sta->table_count >=
2191  lq_sta->table_count_limit) {
2192  lq_sta->table_count = 0;
2193 
2194  IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
2195  for (i = 0; i < IWL_RATE_COUNT; i++)
2196  rs_rate_scale_clear_window(
2197  &(tbl->win[i]));
2198  }
2199  }
2200 
2201  /* If transitioning to allow "search", reset all history
2202  * bitmaps and stats in active table (this will become the new
2203  * "search" table). */
2204  if (!lq_sta->stay_in_tbl) {
2205  for (i = 0; i < IWL_RATE_COUNT; i++)
2206  rs_rate_scale_clear_window(&(tbl->win[i]));
2207  }
2208  }
2209 }
2210 
2211 /*
2212  * setup rate table in uCode
2213  */
2214 static void rs_update_rate_tbl(struct iwl_priv *priv,
2215  struct iwl_rxon_context *ctx,
2216  struct iwl_lq_sta *lq_sta,
2217  struct iwl_scale_tbl_info *tbl,
2218  int index, u8 is_green)
2219 {
2220  u32 rate;
2221 
2222  /* Update uCode's rate table. */
2223  rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2224  rs_fill_link_cmd(priv, lq_sta, rate);
2225  iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2226 }
2227 
2228 /*
2229  * Do rate scaling and search for new modulation mode.
2230  */
2231 static void rs_rate_scale_perform(struct iwl_priv *priv,
2232  struct sk_buff *skb,
2233  struct ieee80211_sta *sta,
2234  struct iwl_lq_sta *lq_sta)
2235 {
2236  struct ieee80211_hw *hw = priv->hw;
2237  struct ieee80211_conf *conf = &hw->conf;
2238  struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2239  struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2240  int low = IWL_RATE_INVALID;
2241  int high = IWL_RATE_INVALID;
2242  int index;
2243  int i;
2244  struct iwl_rate_scale_data *window = NULL;
2245  int current_tpt = IWL_INVALID_VALUE;
2246  int low_tpt = IWL_INVALID_VALUE;
2247  int high_tpt = IWL_INVALID_VALUE;
2248  u32 fail_count;
2249  s8 scale_action = 0;
2250  u16 rate_mask;
2251  u8 update_lq = 0;
2252  struct iwl_scale_tbl_info *tbl, *tbl1;
2253  u16 rate_scale_index_msk = 0;
2254  u8 is_green = 0;
2255  u8 active_tbl = 0;
2256  u8 done_search = 0;
2257  u16 high_low;
2258  s32 sr;
2259  u8 tid = IWL_MAX_TID_COUNT;
2260  struct iwl_tid_data *tid_data;
2261  struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
2262  struct iwl_rxon_context *ctx = sta_priv->ctx;
2263 
2264  IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
2265 
2266  /* Send management frames and NO_ACK data using lowest rate. */
2267  /* TODO: this could probably be improved.. */
2268  if (!ieee80211_is_data(hdr->frame_control) ||
2269  info->flags & IEEE80211_TX_CTL_NO_ACK)
2270  return;
2271 
2272  lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
2273 
2274  tid = rs_tl_add_packet(lq_sta, hdr);
2275  if ((tid != IWL_MAX_TID_COUNT) &&
2276  (lq_sta->tx_agg_tid_en & (1 << tid))) {
2277  tid_data = &priv->tid_data[lq_sta->lq.sta_id][tid];
2278  if (tid_data->agg.state == IWL_AGG_OFF)
2279  lq_sta->is_agg = 0;
2280  else
2281  lq_sta->is_agg = 1;
2282  } else
2283  lq_sta->is_agg = 0;
2284 
2285  /*
2286  * Select rate-scale / modulation-mode table to work with in
2287  * the rest of this function: "search" if searching for better
2288  * modulation mode, or "active" if doing rate scaling within a mode.
2289  */
2290  if (!lq_sta->search_better_tbl)
2291  active_tbl = lq_sta->active_tbl;
2292  else
2293  active_tbl = 1 - lq_sta->active_tbl;
2294 
2295  tbl = &(lq_sta->lq_info[active_tbl]);
2296  if (is_legacy(tbl->lq_type))
2297  lq_sta->is_green = 0;
2298  else
2299  lq_sta->is_green = rs_use_green(sta);
2300  is_green = lq_sta->is_green;
2301 
2302  /* current tx rate */
2303  index = lq_sta->last_txrate_idx;
2304 
2305  IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2306  tbl->lq_type);
2307 
2308  /* rates available for this association, and for modulation mode */
2309  rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2310 
2311  IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
2312 
2313  /* mask with station rate restriction */
2314  if (is_legacy(tbl->lq_type)) {
2315  if (lq_sta->band == IEEE80211_BAND_5GHZ)
2316  /* supp_rates has no CCK bits in A mode */
2317  rate_scale_index_msk = (u16) (rate_mask &
2318  (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2319  else
2320  rate_scale_index_msk = (u16) (rate_mask &
2321  lq_sta->supp_rates);
2322 
2323  } else
2324  rate_scale_index_msk = rate_mask;
2325 
2326  if (!rate_scale_index_msk)
2327  rate_scale_index_msk = rate_mask;
2328 
2329  if (!((1 << index) & rate_scale_index_msk)) {
2330  IWL_ERR(priv, "Current Rate is not valid\n");
2331  if (lq_sta->search_better_tbl) {
2332  /* revert to active table if search table is not valid*/
2333  tbl->lq_type = LQ_NONE;
2334  lq_sta->search_better_tbl = 0;
2335  tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2336  /* get "active" rate info */
2337  index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2338  rs_update_rate_tbl(priv, ctx, lq_sta, tbl,
2339  index, is_green);
2340  }
2341  return;
2342  }
2343 
2344  /* Get expected throughput table and history window for current rate */
2345  if (!tbl->expected_tpt) {
2346  IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2347  return;
2348  }
2349 
2350  /* force user max rate if set by user */
2351  if ((lq_sta->max_rate_idx != -1) &&
2352  (lq_sta->max_rate_idx < index)) {
2353  index = lq_sta->max_rate_idx;
2354  update_lq = 1;
2355  window = &(tbl->win[index]);
2356  goto lq_update;
2357  }
2358 
2359  window = &(tbl->win[index]);
2360 
2361  /*
2362  * If there is not enough history to calculate actual average
2363  * throughput, keep analyzing results of more tx frames, without
2364  * changing rate or mode (bypass most of the rest of this function).
2365  * Set up new rate table in uCode only if old rate is not supported
2366  * in current association (use new rate found above).
2367  */
2368  fail_count = window->counter - window->success_counter;
2369  if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2370  (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2371  IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2372  "for index %d\n",
2373  window->success_counter, window->counter, index);
2374 
2375  /* Can't calculate this yet; not enough history */
2376  window->average_tpt = IWL_INVALID_VALUE;
2377 
2378  /* Should we stay with this modulation mode,
2379  * or search for a new one? */
2380  rs_stay_in_table(lq_sta, false);
2381 
2382  goto out;
2383  }
2384  /* Else we have enough samples; calculate estimate of
2385  * actual average throughput */
2386  if (window->average_tpt != ((window->success_ratio *
2387  tbl->expected_tpt[index] + 64) / 128)) {
2388  IWL_ERR(priv, "expected_tpt should have been calculated by now\n");
2389  window->average_tpt = ((window->success_ratio *
2390  tbl->expected_tpt[index] + 64) / 128);
2391  }
2392 
2393  /* If we are searching for better modulation mode, check success. */
2394  if (lq_sta->search_better_tbl &&
2395  (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
2396  /* If good success, continue using the "search" mode;
2397  * no need to send new link quality command, since we're
2398  * continuing to use the setup that we've been trying. */
2399  if (window->average_tpt > lq_sta->last_tpt) {
2400 
2401  IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2402  "suc=%d cur-tpt=%d old-tpt=%d\n",
2403  window->success_ratio,
2404  window->average_tpt,
2405  lq_sta->last_tpt);
2406 
2407  if (!is_legacy(tbl->lq_type))
2408  lq_sta->enable_counter = 1;
2409 
2410  /* Swap tables; "search" becomes "active" */
2411  lq_sta->active_tbl = active_tbl;
2412  current_tpt = window->average_tpt;
2413 
2414  /* Else poor success; go back to mode in "active" table */
2415  } else {
2416 
2417  IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2418  "suc=%d cur-tpt=%d old-tpt=%d\n",
2419  window->success_ratio,
2420  window->average_tpt,
2421  lq_sta->last_tpt);
2422 
2423  /* Nullify "search" table */
2424  tbl->lq_type = LQ_NONE;
2425 
2426  /* Revert to "active" table */
2427  active_tbl = lq_sta->active_tbl;
2428  tbl = &(lq_sta->lq_info[active_tbl]);
2429 
2430  /* Revert to "active" rate and throughput info */
2431  index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2432  current_tpt = lq_sta->last_tpt;
2433 
2434  /* Need to set up a new rate table in uCode */
2435  update_lq = 1;
2436  }
2437 
2438  /* Either way, we've made a decision; modulation mode
2439  * search is done, allow rate adjustment next time. */
2440  lq_sta->search_better_tbl = 0;
2441  done_search = 1; /* Don't switch modes below! */
2442  goto lq_update;
2443  }
2444 
2445  /* (Else) not in search of better modulation mode, try for better
2446  * starting rate, while staying in this mode. */
2447  high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2448  tbl->lq_type);
2449  low = high_low & 0xff;
2450  high = (high_low >> 8) & 0xff;
2451 
2452  /* If user set max rate, dont allow higher than user constrain */
2453  if ((lq_sta->max_rate_idx != -1) &&
2454  (lq_sta->max_rate_idx < high))
2455  high = IWL_RATE_INVALID;
2456 
2457  sr = window->success_ratio;
2458 
2459  /* Collect measured throughputs for current and adjacent rates */
2460  current_tpt = window->average_tpt;
2461  if (low != IWL_RATE_INVALID)
2462  low_tpt = tbl->win[low].average_tpt;
2463  if (high != IWL_RATE_INVALID)
2464  high_tpt = tbl->win[high].average_tpt;
2465 
2466  scale_action = 0;
2467 
2468  /* Too many failures, decrease rate */
2469  if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2470  IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2471  scale_action = -1;
2472 
2473  /* No throughput measured yet for adjacent rates; try increase. */
2474  } else if ((low_tpt == IWL_INVALID_VALUE) &&
2475  (high_tpt == IWL_INVALID_VALUE)) {
2476 
2477  if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2478  scale_action = 1;
2479  else if (low != IWL_RATE_INVALID)
2480  scale_action = 0;
2481  }
2482 
2483  /* Both adjacent throughputs are measured, but neither one has better
2484  * throughput; we're using the best rate, don't change it! */
2485  else if ((low_tpt != IWL_INVALID_VALUE) &&
2486  (high_tpt != IWL_INVALID_VALUE) &&
2487  (low_tpt < current_tpt) &&
2488  (high_tpt < current_tpt))
2489  scale_action = 0;
2490 
2491  /* At least one adjacent rate's throughput is measured,
2492  * and may have better performance. */
2493  else {
2494  /* Higher adjacent rate's throughput is measured */
2495  if (high_tpt != IWL_INVALID_VALUE) {
2496  /* Higher rate has better throughput */
2497  if (high_tpt > current_tpt &&
2498  sr >= IWL_RATE_INCREASE_TH) {
2499  scale_action = 1;
2500  } else {
2501  scale_action = 0;
2502  }
2503 
2504  /* Lower adjacent rate's throughput is measured */
2505  } else if (low_tpt != IWL_INVALID_VALUE) {
2506  /* Lower rate has better throughput */
2507  if (low_tpt > current_tpt) {
2508  IWL_DEBUG_RATE(priv,
2509  "decrease rate because of low tpt\n");
2510  scale_action = -1;
2511  } else if (sr >= IWL_RATE_INCREASE_TH) {
2512  scale_action = 1;
2513  }
2514  }
2515  }
2516 
2517  /* Sanity check; asked for decrease, but success rate or throughput
2518  * has been good at old rate. Don't change it. */
2519  if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2520  ((sr > IWL_RATE_HIGH_TH) ||
2521  (current_tpt > (100 * tbl->expected_tpt[low]))))
2522  scale_action = 0;
2523  if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2524  scale_action = -1;
2525  if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
2526  (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2527  scale_action = -1;
2528 
2529  if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2530  (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2531  if (lq_sta->last_bt_traffic > priv->bt_traffic_load) {
2532  /*
2533  * don't set scale_action, don't want to scale up if
2534  * the rate scale doesn't otherwise think that is a
2535  * good idea.
2536  */
2537  } else if (lq_sta->last_bt_traffic <= priv->bt_traffic_load) {
2538  scale_action = -1;
2539  }
2540  }
2541  lq_sta->last_bt_traffic = priv->bt_traffic_load;
2542 
2543  if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2544  (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2545  /* search for a new modulation */
2546  rs_stay_in_table(lq_sta, true);
2547  goto lq_update;
2548  }
2549 
2550  switch (scale_action) {
2551  case -1:
2552  /* Decrease starting rate, update uCode's rate table */
2553  if (low != IWL_RATE_INVALID) {
2554  update_lq = 1;
2555  index = low;
2556  }
2557 
2558  break;
2559  case 1:
2560  /* Increase starting rate, update uCode's rate table */
2561  if (high != IWL_RATE_INVALID) {
2562  update_lq = 1;
2563  index = high;
2564  }
2565 
2566  break;
2567  case 0:
2568  /* No change */
2569  default:
2570  break;
2571  }
2572 
2573  IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2574  "high %d type %d\n",
2575  index, scale_action, low, high, tbl->lq_type);
2576 
2577 lq_update:
2578  /* Replace uCode's rate table for the destination station. */
2579  if (update_lq)
2580  rs_update_rate_tbl(priv, ctx, lq_sta, tbl, index, is_green);
2581 
2582  if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
2583  /* Should we stay with this modulation mode,
2584  * or search for a new one? */
2585  rs_stay_in_table(lq_sta, false);
2586  }
2587  /*
2588  * Search for new modulation mode if we're:
2589  * 1) Not changing rates right now
2590  * 2) Not just finishing up a search
2591  * 3) Allowing a new search
2592  */
2593  if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2594  /* Save current throughput to compare with "search" throughput*/
2595  lq_sta->last_tpt = current_tpt;
2596 
2597  /* Select a new "search" modulation mode to try.
2598  * If one is found, set up the new "search" table. */
2599  if (is_legacy(tbl->lq_type))
2600  rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2601  else if (is_siso(tbl->lq_type))
2602  rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2603  else if (is_mimo2(tbl->lq_type))
2604  rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2605  else
2606  rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2607 
2608  /* If new "search" mode was selected, set up in uCode table */
2609  if (lq_sta->search_better_tbl) {
2610  /* Access the "search" table, clear its history. */
2611  tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2612  for (i = 0; i < IWL_RATE_COUNT; i++)
2613  rs_rate_scale_clear_window(&(tbl->win[i]));
2614 
2615  /* Use new "search" start rate */
2616  index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2617 
2618  IWL_DEBUG_RATE(priv, "Switch current mcs: %X index: %d\n",
2619  tbl->current_rate, index);
2620  rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2621  iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2622  } else
2623  done_search = 1;
2624  }
2625 
2626  if (done_search && !lq_sta->stay_in_tbl) {
2627  /* If the "active" (non-search) mode was legacy,
2628  * and we've tried switching antennas,
2629  * but we haven't been able to try HT modes (not available),
2630  * stay with best antenna legacy modulation for a while
2631  * before next round of mode comparisons. */
2632  tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2633  if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2634  lq_sta->action_counter > tbl1->max_search) {
2635  IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2636  rs_set_stay_in_table(priv, 1, lq_sta);
2637  }
2638 
2639  /* If we're in an HT mode, and all 3 mode switch actions
2640  * have been tried and compared, stay in this best modulation
2641  * mode for a while before next round of mode comparisons. */
2642  if (lq_sta->enable_counter &&
2643  (lq_sta->action_counter >= tbl1->max_search) &&
2644  iwl_ht_enabled(priv)) {
2645  if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2646  (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2647  (tid != IWL_MAX_TID_COUNT)) {
2648  u8 sta_id = lq_sta->lq.sta_id;
2649  tid_data = &priv->tid_data[sta_id][tid];
2650  if (tid_data->agg.state == IWL_AGG_OFF) {
2651  IWL_DEBUG_RATE(priv,
2652  "try to aggregate tid %d\n",
2653  tid);
2654  rs_tl_turn_on_agg(priv, tid,
2655  lq_sta, sta);
2656  }
2657  }
2658  rs_set_stay_in_table(priv, 0, lq_sta);
2659  }
2660  }
2661 
2662 out:
2663  tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2664  lq_sta->last_txrate_idx = index;
2665 }
2666 
2681 static void rs_initialize_lq(struct iwl_priv *priv,
2682  struct ieee80211_sta *sta,
2683  struct iwl_lq_sta *lq_sta)
2684 {
2685  struct iwl_scale_tbl_info *tbl;
2686  int rate_idx;
2687  int i;
2688  u32 rate;
2689  u8 use_green = rs_use_green(sta);
2690  u8 active_tbl = 0;
2691  u8 valid_tx_ant;
2692  struct iwl_station_priv *sta_priv;
2693  struct iwl_rxon_context *ctx;
2694 
2695  if (!sta || !lq_sta)
2696  return;
2697 
2698  sta_priv = (void *)sta->drv_priv;
2699  ctx = sta_priv->ctx;
2700 
2701  i = lq_sta->last_txrate_idx;
2702 
2703  valid_tx_ant = priv->eeprom_data->valid_tx_ant;
2704 
2705  if (!lq_sta->search_better_tbl)
2706  active_tbl = lq_sta->active_tbl;
2707  else
2708  active_tbl = 1 - lq_sta->active_tbl;
2709 
2710  tbl = &(lq_sta->lq_info[active_tbl]);
2711 
2712  if ((i < 0) || (i >= IWL_RATE_COUNT))
2713  i = 0;
2714 
2715  rate = iwl_rates[i].plcp;
2716  tbl->ant_type = first_antenna(valid_tx_ant);
2717  rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2718 
2719  if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2720  rate |= RATE_MCS_CCK_MSK;
2721 
2722  rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2723  if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2724  rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2725 
2726  rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2727  tbl->current_rate = rate;
2728  rs_set_expected_tpt_table(lq_sta, tbl);
2729  rs_fill_link_cmd(NULL, lq_sta, rate);
2730  priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2731  iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_SYNC, true);
2732 }
2733 
2734 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2735  struct ieee80211_tx_rate_control *txrc)
2736 {
2737 
2738  struct sk_buff *skb = txrc->skb;
2739  struct ieee80211_supported_band *sband = txrc->sband;
2740  struct iwl_op_mode *op_mode __maybe_unused =
2741  (struct iwl_op_mode *)priv_r;
2742  struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
2743  struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2744  struct iwl_lq_sta *lq_sta = priv_sta;
2745  int rate_idx;
2746 
2747  IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2748 
2749  /* Get max rate if user set max rate */
2750  if (lq_sta) {
2751  lq_sta->max_rate_idx = txrc->max_rate_idx;
2752  if ((sband->band == IEEE80211_BAND_5GHZ) &&
2753  (lq_sta->max_rate_idx != -1))
2754  lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2755  if ((lq_sta->max_rate_idx < 0) ||
2756  (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2757  lq_sta->max_rate_idx = -1;
2758  }
2759 
2760  /* Treat uninitialized rate scaling data same as non-existing. */
2761  if (lq_sta && !lq_sta->drv) {
2762  IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
2763  priv_sta = NULL;
2764  }
2765 
2766  /* Send management frames and NO_ACK data using lowest rate. */
2767  if (rate_control_send_low(sta, priv_sta, txrc))
2768  return;
2769 
2770  rate_idx = lq_sta->last_txrate_idx;
2771 
2772  if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2773  rate_idx -= IWL_FIRST_OFDM_RATE;
2774  /* 6M and 9M shared same MCS index */
2775  rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2776  if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2777  IWL_RATE_MIMO3_6M_PLCP)
2778  rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2779  else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2780  IWL_RATE_MIMO2_6M_PLCP)
2781  rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2782  info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2783  if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2784  info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2785  if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2786  info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
2787  if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2788  info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2789  if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2790  info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2791  } else {
2792  /* Check for invalid rates */
2793  if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2794  ((sband->band == IEEE80211_BAND_5GHZ) &&
2795  (rate_idx < IWL_FIRST_OFDM_RATE)))
2796  rate_idx = rate_lowest_index(sband, sta);
2797  /* On valid 5 GHz rate, adjust index */
2798  else if (sband->band == IEEE80211_BAND_5GHZ)
2799  rate_idx -= IWL_FIRST_OFDM_RATE;
2800  info->control.rates[0].flags = 0;
2801  }
2802  info->control.rates[0].idx = rate_idx;
2803 
2804 }
2805 
2806 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2807  gfp_t gfp)
2808 {
2809  struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2810  struct iwl_op_mode *op_mode __maybe_unused =
2811  (struct iwl_op_mode *)priv_rate;
2812  struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
2813 
2814  IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2815 
2816  return &sta_priv->lq_sta;
2817 }
2818 
2819 /*
2820  * Called after adding a new station to initialize rate scaling
2821  */
2822 void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id)
2823 {
2824  int i, j;
2825  struct ieee80211_hw *hw = priv->hw;
2826  struct ieee80211_conf *conf = &priv->hw->conf;
2827  struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2828  struct iwl_station_priv *sta_priv;
2829  struct iwl_lq_sta *lq_sta;
2830  struct ieee80211_supported_band *sband;
2831  unsigned long supp; /* must be unsigned long for for_each_set_bit */
2832 
2833  sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2834  lq_sta = &sta_priv->lq_sta;
2835  sband = hw->wiphy->bands[conf->channel->band];
2836 
2837 
2838  lq_sta->lq.sta_id = sta_id;
2839 
2840  for (j = 0; j < LQ_SIZE; j++)
2841  for (i = 0; i < IWL_RATE_COUNT; i++)
2842  rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2843 
2844  lq_sta->flush_timer = 0;
2845  lq_sta->supp_rates = sta->supp_rates[sband->band];
2846  for (j = 0; j < LQ_SIZE; j++)
2847  for (i = 0; i < IWL_RATE_COUNT; i++)
2848  rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2849 
2850  IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n",
2851  sta_id);
2852  /* TODO: what is a good starting rate for STA? About middle? Maybe not
2853  * the lowest or the highest rate.. Could consider using RSSI from
2854  * previous packets? Need to have IEEE 802.1X auth succeed immediately
2855  * after assoc.. */
2856 
2857  lq_sta->is_dup = 0;
2858  lq_sta->max_rate_idx = -1;
2859  lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2860  lq_sta->is_green = rs_use_green(sta);
2861  lq_sta->band = sband->band;
2862  /*
2863  * active legacy rates as per supported rates bitmap
2864  */
2865  supp = sta->supp_rates[sband->band];
2866  lq_sta->active_legacy_rate = 0;
2867  for_each_set_bit(i, &supp, BITS_PER_LONG)
2868  lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2869 
2870  /*
2871  * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2872  * supp_rates[] does not; shift to convert format, force 9 MBits off.
2873  */
2874  lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2875  lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2876  lq_sta->active_siso_rate &= ~((u16)0x2);
2877  lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2878 
2879  /* Same here */
2880  lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2881  lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2882  lq_sta->active_mimo2_rate &= ~((u16)0x2);
2883  lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2884 
2885  lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2886  lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2887  lq_sta->active_mimo3_rate &= ~((u16)0x2);
2888  lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2889 
2890  IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2891  lq_sta->active_siso_rate,
2892  lq_sta->active_mimo2_rate,
2893  lq_sta->active_mimo3_rate);
2894 
2895  /* These values will be overridden later */
2896  lq_sta->lq.general_params.single_stream_ant_msk =
2897  first_antenna(priv->eeprom_data->valid_tx_ant);
2898  lq_sta->lq.general_params.dual_stream_ant_msk =
2899  priv->eeprom_data->valid_tx_ant &
2900  ~first_antenna(priv->eeprom_data->valid_tx_ant);
2901  if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2902  lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2903  } else if (num_of_ant(priv->eeprom_data->valid_tx_ant) == 2) {
2904  lq_sta->lq.general_params.dual_stream_ant_msk =
2905  priv->eeprom_data->valid_tx_ant;
2906  }
2907 
2908  /* as default allow aggregation for all tids */
2909  lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2910  lq_sta->drv = priv;
2911 
2912  /* Set last_txrate_idx to lowest rate */
2913  lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2914  if (sband->band == IEEE80211_BAND_5GHZ)
2915  lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2916  lq_sta->is_agg = 0;
2917 #ifdef CONFIG_IWLWIFI_DEVICE_TESTMODE
2918  priv->tm_fixed_rate = 0;
2919 #endif
2920 #ifdef CONFIG_MAC80211_DEBUGFS
2921  lq_sta->dbg_fixed_rate = 0;
2922 #endif
2923 
2924  rs_initialize_lq(priv, sta, lq_sta);
2925 }
2926 
2927 static void rs_fill_link_cmd(struct iwl_priv *priv,
2928  struct iwl_lq_sta *lq_sta, u32 new_rate)
2929 {
2930  struct iwl_scale_tbl_info tbl_type;
2931  int index = 0;
2932  int rate_idx;
2933  int repeat_rate = 0;
2934  u8 ant_toggle_cnt = 0;
2935  u8 use_ht_possible = 1;
2936  u8 valid_tx_ant = 0;
2937  struct iwl_station_priv *sta_priv =
2938  container_of(lq_sta, struct iwl_station_priv, lq_sta);
2939  struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2940 
2941  /* Override starting rate (index 0) if needed for debug purposes */
2942  rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2943 
2944  /* Interpret new_rate (rate_n_flags) */
2945  rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2946  &tbl_type, &rate_idx);
2947 
2948  if (priv && priv->bt_full_concurrent) {
2949  /* 1x1 only */
2950  tbl_type.ant_type =
2951  first_antenna(priv->eeprom_data->valid_tx_ant);
2952  }
2953 
2954  /* How many times should we repeat the initial rate? */
2955  if (is_legacy(tbl_type.lq_type)) {
2956  ant_toggle_cnt = 1;
2957  repeat_rate = IWL_NUMBER_TRY;
2958  } else {
2959  repeat_rate = min(IWL_HT_NUMBER_TRY,
2960  LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2961  }
2962 
2963  lq_cmd->general_params.mimo_delimiter =
2964  is_mimo(tbl_type.lq_type) ? 1 : 0;
2965 
2966  /* Fill 1st table entry (index 0) */
2967  lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2968 
2969  if (num_of_ant(tbl_type.ant_type) == 1) {
2970  lq_cmd->general_params.single_stream_ant_msk =
2971  tbl_type.ant_type;
2972  } else if (num_of_ant(tbl_type.ant_type) == 2) {
2973  lq_cmd->general_params.dual_stream_ant_msk =
2974  tbl_type.ant_type;
2975  } /* otherwise we don't modify the existing value */
2976 
2977  index++;
2978  repeat_rate--;
2979  if (priv) {
2980  if (priv->bt_full_concurrent)
2981  valid_tx_ant = ANT_A;
2982  else
2983  valid_tx_ant = priv->eeprom_data->valid_tx_ant;
2984  }
2985 
2986  /* Fill rest of rate table */
2987  while (index < LINK_QUAL_MAX_RETRY_NUM) {
2988  /* Repeat initial/next rate.
2989  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2990  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2991  while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2992  if (is_legacy(tbl_type.lq_type)) {
2993  if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2994  ant_toggle_cnt++;
2995  else if (priv &&
2996  rs_toggle_antenna(valid_tx_ant,
2997  &new_rate, &tbl_type))
2998  ant_toggle_cnt = 1;
2999  }
3000 
3001  /* Override next rate if needed for debug purposes */
3002  rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
3003 
3004  /* Fill next table entry */
3005  lq_cmd->rs_table[index].rate_n_flags =
3006  cpu_to_le32(new_rate);
3007  repeat_rate--;
3008  index++;
3009  }
3010 
3011  rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
3012  &rate_idx);
3013 
3014  if (priv && priv->bt_full_concurrent) {
3015  /* 1x1 only */
3016  tbl_type.ant_type =
3017  first_antenna(priv->eeprom_data->valid_tx_ant);
3018  }
3019 
3020  /* Indicate to uCode which entries might be MIMO.
3021  * If initial rate was MIMO, this will finally end up
3022  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
3023  if (is_mimo(tbl_type.lq_type))
3024  lq_cmd->general_params.mimo_delimiter = index;
3025 
3026  /* Get next rate */
3027  new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
3028  use_ht_possible);
3029 
3030  /* How many times should we repeat the next rate? */
3031  if (is_legacy(tbl_type.lq_type)) {
3032  if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
3033  ant_toggle_cnt++;
3034  else if (priv &&
3035  rs_toggle_antenna(valid_tx_ant,
3036  &new_rate, &tbl_type))
3037  ant_toggle_cnt = 1;
3038 
3039  repeat_rate = IWL_NUMBER_TRY;
3040  } else {
3041  repeat_rate = IWL_HT_NUMBER_TRY;
3042  }
3043 
3044  /* Don't allow HT rates after next pass.
3045  * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
3046  use_ht_possible = 0;
3047 
3048  /* Override next rate if needed for debug purposes */
3049  rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
3050 
3051  /* Fill next table entry */
3052  lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
3053 
3054  index++;
3055  repeat_rate--;
3056  }
3057 
3058  lq_cmd->agg_params.agg_frame_cnt_limit =
3059  sta_priv->max_agg_bufsize ?: LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3060  lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
3061 
3062  lq_cmd->agg_params.agg_time_limit =
3063  cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
3064  /*
3065  * overwrite if needed, pass aggregation time limit
3066  * to uCode in uSec
3067  */
3068  if (priv && priv->cfg->bt_params &&
3069  priv->cfg->bt_params->agg_time_limit &&
3070  priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH)
3071  lq_cmd->agg_params.agg_time_limit =
3072  cpu_to_le16(priv->cfg->bt_params->agg_time_limit);
3073 }
3074 
3075 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3076 {
3077  return hw->priv;
3078 }
3079 /* rate scale requires free function to be implemented */
3080 static void rs_free(void *priv_rate)
3081 {
3082  return;
3083 }
3084 
3085 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
3086  void *priv_sta)
3087 {
3088  struct iwl_op_mode *op_mode __maybe_unused = priv_r;
3089  struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
3090 
3091  IWL_DEBUG_RATE(priv, "enter\n");
3092  IWL_DEBUG_RATE(priv, "leave\n");
3093 }
3094 
3095 #ifdef CONFIG_MAC80211_DEBUGFS
3096 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
3097  u32 *rate_n_flags, int index)
3098 {
3099  struct iwl_priv *priv;
3100  u8 valid_tx_ant;
3101  u8 ant_sel_tx;
3102 
3103  priv = lq_sta->drv;
3104  valid_tx_ant = priv->eeprom_data->valid_tx_ant;
3105  if (lq_sta->dbg_fixed_rate) {
3106  ant_sel_tx =
3107  ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
3108  >> RATE_MCS_ANT_POS);
3109  if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
3110  *rate_n_flags = lq_sta->dbg_fixed_rate;
3111  IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
3112  } else {
3113  lq_sta->dbg_fixed_rate = 0;
3114  IWL_ERR(priv,
3115  "Invalid antenna selection 0x%X, Valid is 0x%X\n",
3116  ant_sel_tx, valid_tx_ant);
3117  IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3118  }
3119  } else {
3120  IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3121  }
3122 }
3123 
3124 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3125  const char __user *user_buf, size_t count, loff_t *ppos)
3126 {
3127  struct iwl_lq_sta *lq_sta = file->private_data;
3128  struct iwl_priv *priv;
3129  char buf[64];
3130  size_t buf_size;
3131  u32 parsed_rate;
3132 
3133 
3134  priv = lq_sta->drv;
3135  memset(buf, 0, sizeof(buf));
3136  buf_size = min(count, sizeof(buf) - 1);
3137  if (copy_from_user(buf, user_buf, buf_size))
3138  return -EFAULT;
3139 
3140  if (sscanf(buf, "%x", &parsed_rate) == 1)
3141  lq_sta->dbg_fixed_rate = parsed_rate;
3142  else
3143  lq_sta->dbg_fixed_rate = 0;
3144 
3145  rs_program_fix_rate(priv, lq_sta);
3146 
3147  return count;
3148 }
3149 
3150 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3151  char __user *user_buf, size_t count, loff_t *ppos)
3152 {
3153  char *buff;
3154  int desc = 0;
3155  int i = 0;
3156  int index = 0;
3157  ssize_t ret;
3158 
3159  struct iwl_lq_sta *lq_sta = file->private_data;
3160  struct iwl_priv *priv;
3161  struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3162 
3163  priv = lq_sta->drv;
3164  buff = kmalloc(1024, GFP_KERNEL);
3165  if (!buff)
3166  return -ENOMEM;
3167 
3168  desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3169  desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
3170  lq_sta->total_failed, lq_sta->total_success,
3171  lq_sta->active_legacy_rate);
3172  desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3173  lq_sta->dbg_fixed_rate);
3174  desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3175  (priv->eeprom_data->valid_tx_ant & ANT_A) ? "ANT_A," : "",
3176  (priv->eeprom_data->valid_tx_ant & ANT_B) ? "ANT_B," : "",
3177  (priv->eeprom_data->valid_tx_ant & ANT_C) ? "ANT_C" : "");
3178  desc += sprintf(buff+desc, "lq type %s\n",
3179  (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
3180  if (is_Ht(tbl->lq_type)) {
3181  desc += sprintf(buff+desc, " %s",
3182  (is_siso(tbl->lq_type)) ? "SISO" :
3183  ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
3184  desc += sprintf(buff+desc, " %s",
3185  (tbl->is_ht40) ? "40MHz" : "20MHz");
3186  desc += sprintf(buff+desc, " %s %s %s\n", (tbl->is_SGI) ? "SGI" : "",
3187  (lq_sta->is_green) ? "GF enabled" : "",
3188  (lq_sta->is_agg) ? "AGG on" : "");
3189  }
3190  desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3191  lq_sta->last_rate_n_flags);
3192  desc += sprintf(buff+desc, "general:"
3193  "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
3194  lq_sta->lq.general_params.flags,
3195  lq_sta->lq.general_params.mimo_delimiter,
3196  lq_sta->lq.general_params.single_stream_ant_msk,
3197  lq_sta->lq.general_params.dual_stream_ant_msk);
3198 
3199  desc += sprintf(buff+desc, "agg:"
3200  "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3201  le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
3202  lq_sta->lq.agg_params.agg_dis_start_th,
3203  lq_sta->lq.agg_params.agg_frame_cnt_limit);
3204 
3205  desc += sprintf(buff+desc,
3206  "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3207  lq_sta->lq.general_params.start_rate_index[0],
3208  lq_sta->lq.general_params.start_rate_index[1],
3209  lq_sta->lq.general_params.start_rate_index[2],
3210  lq_sta->lq.general_params.start_rate_index[3]);
3211 
3212  for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3213  index = iwl_hwrate_to_plcp_idx(
3214  le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
3215  if (is_legacy(tbl->lq_type)) {
3216  desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
3217  i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3218  iwl_rate_mcs[index].mbps);
3219  } else {
3220  desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
3221  i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3222  iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
3223  }
3224  }
3225 
3226  ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3227  kfree(buff);
3228  return ret;
3229 }
3230 
3231 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3232  .write = rs_sta_dbgfs_scale_table_write,
3233  .read = rs_sta_dbgfs_scale_table_read,
3234  .open = simple_open,
3235  .llseek = default_llseek,
3236 };
3237 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3238  char __user *user_buf, size_t count, loff_t *ppos)
3239 {
3240  char *buff;
3241  int desc = 0;
3242  int i, j;
3243  ssize_t ret;
3244 
3245  struct iwl_lq_sta *lq_sta = file->private_data;
3246 
3247  buff = kmalloc(1024, GFP_KERNEL);
3248  if (!buff)
3249  return -ENOMEM;
3250 
3251  for (i = 0; i < LQ_SIZE; i++) {
3252  desc += sprintf(buff+desc,
3253  "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
3254  "rate=0x%X\n",
3255  lq_sta->active_tbl == i ? "*" : "x",
3256  lq_sta->lq_info[i].lq_type,
3257  lq_sta->lq_info[i].is_SGI,
3258  lq_sta->lq_info[i].is_ht40,
3259  lq_sta->lq_info[i].is_dup,
3260  lq_sta->is_green,
3261  lq_sta->lq_info[i].current_rate);
3262  for (j = 0; j < IWL_RATE_COUNT; j++) {
3263  desc += sprintf(buff+desc,
3264  "counter=%d success=%d %%=%d\n",
3265  lq_sta->lq_info[i].win[j].counter,
3266  lq_sta->lq_info[i].win[j].success_counter,
3267  lq_sta->lq_info[i].win[j].success_ratio);
3268  }
3269  }
3270  ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3271  kfree(buff);
3272  return ret;
3273 }
3274 
3275 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3276  .read = rs_sta_dbgfs_stats_table_read,
3277  .open = simple_open,
3278  .llseek = default_llseek,
3279 };
3280 
3281 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3282  char __user *user_buf, size_t count, loff_t *ppos)
3283 {
3284  struct iwl_lq_sta *lq_sta = file->private_data;
3285  struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3286  char buff[120];
3287  int desc = 0;
3288 
3289  if (is_Ht(tbl->lq_type))
3290  desc += sprintf(buff+desc,
3291  "Bit Rate= %d Mb/s\n",
3292  tbl->expected_tpt[lq_sta->last_txrate_idx]);
3293  else
3294  desc += sprintf(buff+desc,
3295  "Bit Rate= %d Mb/s\n",
3296  iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3297 
3298  return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3299 }
3300 
3301 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3302  .read = rs_sta_dbgfs_rate_scale_data_read,
3303  .open = simple_open,
3304  .llseek = default_llseek,
3305 };
3306 
3307 static void rs_add_debugfs(void *priv, void *priv_sta,
3308  struct dentry *dir)
3309 {
3310  struct iwl_lq_sta *lq_sta = priv_sta;
3311  lq_sta->rs_sta_dbgfs_scale_table_file =
3312  debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3313  lq_sta, &rs_sta_dbgfs_scale_table_ops);
3314  lq_sta->rs_sta_dbgfs_stats_table_file =
3315  debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3316  lq_sta, &rs_sta_dbgfs_stats_table_ops);
3317  lq_sta->rs_sta_dbgfs_rate_scale_data_file =
3318  debugfs_create_file("rate_scale_data", S_IRUSR, dir,
3319  lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
3320  lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
3321  debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3322  &lq_sta->tx_agg_tid_en);
3323 
3324 }
3325 
3326 static void rs_remove_debugfs(void *priv, void *priv_sta)
3327 {
3328  struct iwl_lq_sta *lq_sta = priv_sta;
3329  debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3330  debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
3331  debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
3332  debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
3333 }
3334 #endif
3335 
3336 /*
3337  * Initialization of rate scaling information is done by driver after
3338  * the station is added. Since mac80211 calls this function before a
3339  * station is added we ignore it.
3340  */
3341 static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband,
3342  struct ieee80211_sta *sta, void *priv_sta)
3343 {
3344 }
3345 static struct rate_control_ops rs_ops = {
3346  .module = NULL,
3347  .name = RS_NAME,
3348  .tx_status = rs_tx_status,
3349  .get_rate = rs_get_rate,
3350  .rate_init = rs_rate_init_stub,
3351  .alloc = rs_alloc,
3352  .free = rs_free,
3353  .alloc_sta = rs_alloc_sta,
3354  .free_sta = rs_free_sta,
3355 #ifdef CONFIG_MAC80211_DEBUGFS
3356  .add_sta_debugfs = rs_add_debugfs,
3357  .remove_sta_debugfs = rs_remove_debugfs,
3358 #endif
3359 };
3360 
3361 int iwlagn_rate_control_register(void)
3362 {
3363  return ieee80211_rate_control_register(&rs_ops);
3364 }
3365 
3366 void iwlagn_rate_control_unregister(void)
3367 {
3368  ieee80211_rate_control_unregister(&rs_ops);
3369 }
3370 
Generated on Thu Jan 10 2013 14:11:45 for Linux Kernel by   doxygen 1.8.2