d7e2856e41d3b0e90929d605096e9e40932f95ee
[linux-2.6.git] / drivers / net / wireless / iwlegacy / 4965-rs.c
1 /******************************************************************************
2  *
3  * Copyright(c) 2005 - 2011 Intel Corporation. All rights reserved.
4  *
5  * This program is free software; you can redistribute it and/or modify it
6  * under the terms of version 2 of the GNU General Public License as
7  * published by the Free Software Foundation.
8  *
9  * This program is distributed in the hope that it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
12  * more details.
13  *
14  * You should have received a copy of the GNU General Public License along with
15  * this program; if not, write to the Free Software Foundation, Inc.,
16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
17  *
18  * The full GNU General Public License is included in this distribution in the
19  * file called LICENSE.
20  *
21  * Contact Information:
22  *  Intel Linux Wireless <ilw@linux.intel.com>
23  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
24  *
25  *****************************************************************************/
26 #include <linux/kernel.h>
27 #include <linux/init.h>
28 #include <linux/skbuff.h>
29 #include <linux/slab.h>
30 #include <net/mac80211.h>
31
32 #include <linux/netdevice.h>
33 #include <linux/etherdevice.h>
34 #include <linux/delay.h>
35
36 #include <linux/workqueue.h>
37
38 #include "common.h"
39 #include "4965.h"
40
41 #define IL4965_RS_NAME "iwl-4965-rs"
42
43 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
44 #define IL_NUMBER_TRY      1
45 #define IL_HT_NUMBER_TRY   3
46
47 #define RATE_MAX_WINDOW         62      /* # tx in history win */
48 #define RATE_MIN_FAILURE_TH             6       /* min failures to calc tpt */
49 #define RATE_MIN_SUCCESS_TH             8       /* min successes to calc tpt */
50
51 /* max allowed rate miss before sync LQ cmd */
52 #define IL_MISSED_RATE_MAX              15
53 /* max time to accum history 2 seconds */
54 #define RATE_SCALE_FLUSH_INTVL   (3*HZ)
55
56 static u8 rs_ht_to_legacy[] = {
57         RATE_6M_IDX, RATE_6M_IDX,
58         RATE_6M_IDX, RATE_6M_IDX,
59         RATE_6M_IDX,
60         RATE_6M_IDX, RATE_9M_IDX,
61         RATE_12M_IDX, RATE_18M_IDX,
62         RATE_24M_IDX, RATE_36M_IDX,
63         RATE_48M_IDX, RATE_54M_IDX
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 IL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np)    \
78         [RATE_##r##M_IDX] = { RATE_##r##M_PLCP,      \
79                                     RATE_SISO_##s##M_PLCP, \
80                                     RATE_MIMO2_##s##M_PLCP,\
81                                     RATE_##r##M_IEEE,      \
82                                     RATE_##ip##M_IDX,    \
83                                     RATE_##in##M_IDX,    \
84                                     RATE_##rp##M_IDX,    \
85                                     RATE_##rn##M_IDX,    \
86                                     RATE_##pp##M_IDX,    \
87                                     RATE_##np##M_IDX }
88
89 /*
90  * Parameter order:
91  *   rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
92  *
93  * If there isn't a valid next or previous rate then INV is used which
94  * maps to RATE_INVALID
95  *
96  */
97 const struct il_rate_info il_rates[RATE_COUNT] = {
98         IL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2),   /*  1mbps */
99         IL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5),         /*  2mbps */
100         IL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11),       /*5.5mbps */
101         IL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18),     /* 11mbps */
102         IL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11),         /*  6mbps */
103         IL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11),        /*  9mbps */
104         IL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18),   /* 12mbps */
105         IL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24),   /* 18mbps */
106         IL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36),   /* 24mbps */
107         IL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48),   /* 36mbps */
108         IL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54),   /* 48mbps */
109         IL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
110         IL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
111 };
112
113 static int
114 il4965_hwrate_to_plcp_idx(u32 rate_n_flags)
115 {
116         int idx = 0;
117
118         /* HT rate format */
119         if (rate_n_flags & RATE_MCS_HT_MSK) {
120                 idx = (rate_n_flags & 0xff);
121
122                 if (idx >= RATE_MIMO2_6M_PLCP)
123                         idx = idx - RATE_MIMO2_6M_PLCP;
124
125                 idx += IL_FIRST_OFDM_RATE;
126                 /* skip 9M not supported in ht */
127                 if (idx >= RATE_9M_IDX)
128                         idx += 1;
129                 if (idx >= IL_FIRST_OFDM_RATE && idx <= IL_LAST_OFDM_RATE)
130                         return idx;
131
132                 /* legacy rate format, search for match in table */
133         } else {
134                 for (idx = 0; idx < ARRAY_SIZE(il_rates); idx++)
135                         if (il_rates[idx].plcp == (rate_n_flags & 0xFF))
136                                 return idx;
137         }
138
139         return -1;
140 }
141
142 static void il4965_rs_rate_scale_perform(struct il_priv *il,
143                                          struct sk_buff *skb,
144                                          struct ieee80211_sta *sta,
145                                          struct il_lq_sta *lq_sta);
146 static void il4965_rs_fill_link_cmd(struct il_priv *il,
147                                     struct il_lq_sta *lq_sta, u32 rate_n_flags);
148 static void il4965_rs_stay_in_table(struct il_lq_sta *lq_sta,
149                                     bool force_search);
150
151 #ifdef CONFIG_MAC80211_DEBUGFS
152 static void il4965_rs_dbgfs_set_mcs(struct il_lq_sta *lq_sta,
153                                     u32 *rate_n_flags, int idx);
154 #else
155 static void
156 il4965_rs_dbgfs_set_mcs(struct il_lq_sta *lq_sta, u32 * rate_n_flags, int idx)
157 {
158 }
159 #endif
160
161 /**
162  * The following tables contain the expected throughput metrics for all rates
163  *
164  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
165  *
166  * where invalid entries are zeros.
167  *
168  * CCK rates are only valid in legacy table and will only be used in G
169  * (2.4 GHz) band.
170  */
171
172 static s32 expected_tpt_legacy[RATE_COUNT] = {
173         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
174 };
175
176 static s32 expected_tpt_siso20MHz[4][RATE_COUNT] = {
177         {0, 0, 0, 0, 42, 0, 76, 102, 124, 158, 183, 193, 202},  /* Norm */
178         {0, 0, 0, 0, 46, 0, 82, 110, 132, 167, 192, 202, 210},  /* SGI */
179         {0, 0, 0, 0, 48, 0, 93, 135, 176, 251, 319, 351, 381},  /* AGG */
180         {0, 0, 0, 0, 53, 0, 102, 149, 193, 275, 348, 381, 413}, /* AGG+SGI */
181 };
182
183 static s32 expected_tpt_siso40MHz[4][RATE_COUNT] = {
184         {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
185         {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
186         {0, 0, 0, 0, 96, 0, 182, 259, 328, 451, 553, 598, 640}, /* AGG */
187         {0, 0, 0, 0, 106, 0, 199, 282, 357, 487, 593, 640, 683},        /* AGG+SGI */
188 };
189
190 static s32 expected_tpt_mimo2_20MHz[4][RATE_COUNT] = {
191         {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250}, /* Norm */
192         {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256}, /* SGI */
193         {0, 0, 0, 0, 92, 0, 175, 250, 317, 436, 534, 578, 619}, /* AGG */
194         {0, 0, 0, 0, 102, 0, 192, 273, 344, 470, 573, 619, 660},        /* AGG+SGI */
195 };
196
197 static s32 expected_tpt_mimo2_40MHz[4][RATE_COUNT] = {
198         {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289},        /* Norm */
199         {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293},        /* SGI */
200         {0, 0, 0, 0, 180, 0, 327, 446, 545, 708, 828, 878, 922},        /* AGG */
201         {0, 0, 0, 0, 197, 0, 355, 481, 584, 752, 872, 922, 966},        /* AGG+SGI */
202 };
203
204 /* mbps, mcs */
205 static const struct il_rate_mcs_info il_rate_mcs[RATE_COUNT] = {
206         {"1", "BPSK DSSS"},
207         {"2", "QPSK DSSS"},
208         {"5.5", "BPSK CCK"},
209         {"11", "QPSK CCK"},
210         {"6", "BPSK 1/2"},
211         {"9", "BPSK 1/2"},
212         {"12", "QPSK 1/2"},
213         {"18", "QPSK 3/4"},
214         {"24", "16QAM 1/2"},
215         {"36", "16QAM 3/4"},
216         {"48", "64QAM 2/3"},
217         {"54", "64QAM 3/4"},
218         {"60", "64QAM 5/6"},
219 };
220
221 #define MCS_IDX_PER_STREAM      (8)
222
223 static inline u8
224 il4965_rs_extract_rate(u32 rate_n_flags)
225 {
226         return (u8) (rate_n_flags & 0xFF);
227 }
228
229 static void
230 il4965_rs_rate_scale_clear_win(struct il_rate_scale_data *win)
231 {
232         win->data = 0;
233         win->success_counter = 0;
234         win->success_ratio = IL_INVALID_VALUE;
235         win->counter = 0;
236         win->average_tpt = IL_INVALID_VALUE;
237         win->stamp = 0;
238 }
239
240 static inline u8
241 il4965_rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
242 {
243         return (ant_type & valid_antenna) == ant_type;
244 }
245
246 /*
247  *      removes the old data from the stats. All data that is older than
248  *      TID_MAX_TIME_DIFF, will be deleted.
249  */
250 static void
251 il4965_rs_tl_rm_old_stats(struct il_traffic_load *tl, u32 curr_time)
252 {
253         /* The oldest age we want to keep */
254         u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
255
256         while (tl->queue_count && tl->time_stamp < oldest_time) {
257                 tl->total -= tl->packet_count[tl->head];
258                 tl->packet_count[tl->head] = 0;
259                 tl->time_stamp += TID_QUEUE_CELL_SPACING;
260                 tl->queue_count--;
261                 tl->head++;
262                 if (tl->head >= TID_QUEUE_MAX_SIZE)
263                         tl->head = 0;
264         }
265 }
266
267 /*
268  *      increment traffic load value for tid and also remove
269  *      any old values if passed the certain time period
270  */
271 static u8
272 il4965_rs_tl_add_packet(struct il_lq_sta *lq_data, struct ieee80211_hdr *hdr)
273 {
274         u32 curr_time = jiffies_to_msecs(jiffies);
275         u32 time_diff;
276         s32 idx;
277         struct il_traffic_load *tl = NULL;
278         u8 tid;
279
280         if (ieee80211_is_data_qos(hdr->frame_control)) {
281                 u8 *qc = ieee80211_get_qos_ctl(hdr);
282                 tid = qc[0] & 0xf;
283         } else
284                 return MAX_TID_COUNT;
285
286         if (unlikely(tid >= TID_MAX_LOAD_COUNT))
287                 return MAX_TID_COUNT;
288
289         tl = &lq_data->load[tid];
290
291         curr_time -= curr_time % TID_ROUND_VALUE;
292
293         /* Happens only for the first packet. Initialize the data */
294         if (!(tl->queue_count)) {
295                 tl->total = 1;
296                 tl->time_stamp = curr_time;
297                 tl->queue_count = 1;
298                 tl->head = 0;
299                 tl->packet_count[0] = 1;
300                 return MAX_TID_COUNT;
301         }
302
303         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
304         idx = time_diff / TID_QUEUE_CELL_SPACING;
305
306         /* The history is too long: remove data that is older than */
307         /* TID_MAX_TIME_DIFF */
308         if (idx >= TID_QUEUE_MAX_SIZE)
309                 il4965_rs_tl_rm_old_stats(tl, curr_time);
310
311         idx = (tl->head + idx) % TID_QUEUE_MAX_SIZE;
312         tl->packet_count[idx] = tl->packet_count[idx] + 1;
313         tl->total = tl->total + 1;
314
315         if ((idx + 1) > tl->queue_count)
316                 tl->queue_count = idx + 1;
317
318         return tid;
319 }
320
321 /*
322         get the traffic load value for tid
323 */
324 static u32
325 il4965_rs_tl_get_load(struct il_lq_sta *lq_data, u8 tid)
326 {
327         u32 curr_time = jiffies_to_msecs(jiffies);
328         u32 time_diff;
329         s32 idx;
330         struct il_traffic_load *tl = NULL;
331
332         if (tid >= TID_MAX_LOAD_COUNT)
333                 return 0;
334
335         tl = &(lq_data->load[tid]);
336
337         curr_time -= curr_time % TID_ROUND_VALUE;
338
339         if (!(tl->queue_count))
340                 return 0;
341
342         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
343         idx = time_diff / TID_QUEUE_CELL_SPACING;
344
345         /* The history is too long: remove data that is older than */
346         /* TID_MAX_TIME_DIFF */
347         if (idx >= TID_QUEUE_MAX_SIZE)
348                 il4965_rs_tl_rm_old_stats(tl, curr_time);
349
350         return tl->total;
351 }
352
353 static int
354 il4965_rs_tl_turn_on_agg_for_tid(struct il_priv *il, struct il_lq_sta *lq_data,
355                                  u8 tid, struct ieee80211_sta *sta)
356 {
357         int ret = -EAGAIN;
358         u32 load;
359
360         load = il4965_rs_tl_get_load(lq_data, tid);
361
362         if (load > IL_AGG_LOAD_THRESHOLD) {
363                 D_HT("Starting Tx agg: STA: %pM tid: %d\n", sta->addr, tid);
364                 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
365                 if (ret == -EAGAIN) {
366                         /*
367                          * driver and mac80211 is out of sync
368                          * this might be cause by reloading firmware
369                          * stop the tx ba session here
370                          */
371                         IL_ERR("Fail start Tx agg on tid: %d\n", tid);
372                         ieee80211_stop_tx_ba_session(sta, tid);
373                 }
374         } else
375                 D_HT("Aggregation not enabled for tid %d because load = %u\n",
376                      tid, load);
377
378         return ret;
379 }
380
381 static void
382 il4965_rs_tl_turn_on_agg(struct il_priv *il, u8 tid, struct il_lq_sta *lq_data,
383                          struct ieee80211_sta *sta)
384 {
385         if (tid < TID_MAX_LOAD_COUNT)
386                 il4965_rs_tl_turn_on_agg_for_tid(il, lq_data, tid, sta);
387         else
388                 IL_ERR("tid exceeds max load count: %d/%d\n", tid,
389                        TID_MAX_LOAD_COUNT);
390 }
391
392 static inline int
393 il4965_get_il4965_num_of_ant_from_rate(u32 rate_n_flags)
394 {
395         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
396             !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
397             !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
398 }
399
400 /*
401  * Static function to get the expected throughput from an il_scale_tbl_info
402  * that wraps a NULL pointer check
403  */
404 static s32
405 il4965_get_expected_tpt(struct il_scale_tbl_info *tbl, int rs_idx)
406 {
407         if (tbl->expected_tpt)
408                 return tbl->expected_tpt[rs_idx];
409         return 0;
410 }
411
412 /**
413  * il4965_rs_collect_tx_data - Update the success/failure sliding win
414  *
415  * We keep a sliding win of the last 62 packets transmitted
416  * at this rate.  win->data contains the bitmask of successful
417  * packets.
418  */
419 static int
420 il4965_rs_collect_tx_data(struct il_scale_tbl_info *tbl, int scale_idx,
421                           int attempts, int successes)
422 {
423         struct il_rate_scale_data *win = NULL;
424         static const u64 mask = (((u64) 1) << (RATE_MAX_WINDOW - 1));
425         s32 fail_count, tpt;
426
427         if (scale_idx < 0 || scale_idx >= RATE_COUNT)
428                 return -EINVAL;
429
430         /* Select win for current tx bit rate */
431         win = &(tbl->win[scale_idx]);
432
433         /* Get expected throughput */
434         tpt = il4965_get_expected_tpt(tbl, scale_idx);
435
436         /*
437          * Keep track of only the latest 62 tx frame attempts in this rate's
438          * history win; anything older isn't really relevant any more.
439          * If we have filled up the sliding win, drop the oldest attempt;
440          * if the oldest attempt (highest bit in bitmap) shows "success",
441          * subtract "1" from the success counter (this is the main reason
442          * we keep these bitmaps!).
443          */
444         while (attempts > 0) {
445                 if (win->counter >= RATE_MAX_WINDOW) {
446
447                         /* remove earliest */
448                         win->counter = RATE_MAX_WINDOW - 1;
449
450                         if (win->data & mask) {
451                                 win->data &= ~mask;
452                                 win->success_counter--;
453                         }
454                 }
455
456                 /* Increment frames-attempted counter */
457                 win->counter++;
458
459                 /* Shift bitmap by one frame to throw away oldest history */
460                 win->data <<= 1;
461
462                 /* Mark the most recent #successes attempts as successful */
463                 if (successes > 0) {
464                         win->success_counter++;
465                         win->data |= 0x1;
466                         successes--;
467                 }
468
469                 attempts--;
470         }
471
472         /* Calculate current success ratio, avoid divide-by-0! */
473         if (win->counter > 0)
474                 win->success_ratio =
475                     128 * (100 * win->success_counter) / win->counter;
476         else
477                 win->success_ratio = IL_INVALID_VALUE;
478
479         fail_count = win->counter - win->success_counter;
480
481         /* Calculate average throughput, if we have enough history. */
482         if (fail_count >= RATE_MIN_FAILURE_TH ||
483             win->success_counter >= RATE_MIN_SUCCESS_TH)
484                 win->average_tpt = (win->success_ratio * tpt + 64) / 128;
485         else
486                 win->average_tpt = IL_INVALID_VALUE;
487
488         /* Tag this win as having been updated */
489         win->stamp = jiffies;
490
491         return 0;
492 }
493
494 /*
495  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
496  */
497 static u32
498 il4965_rate_n_flags_from_tbl(struct il_priv *il, struct il_scale_tbl_info *tbl,
499                              int idx, u8 use_green)
500 {
501         u32 rate_n_flags = 0;
502
503         if (is_legacy(tbl->lq_type)) {
504                 rate_n_flags = il_rates[idx].plcp;
505                 if (idx >= IL_FIRST_CCK_RATE && idx <= IL_LAST_CCK_RATE)
506                         rate_n_flags |= RATE_MCS_CCK_MSK;
507
508         } else if (is_Ht(tbl->lq_type)) {
509                 if (idx > IL_LAST_OFDM_RATE) {
510                         IL_ERR("Invalid HT rate idx %d\n", idx);
511                         idx = IL_LAST_OFDM_RATE;
512                 }
513                 rate_n_flags = RATE_MCS_HT_MSK;
514
515                 if (is_siso(tbl->lq_type))
516                         rate_n_flags |= il_rates[idx].plcp_siso;
517                 else
518                         rate_n_flags |= il_rates[idx].plcp_mimo2;
519         } else {
520                 IL_ERR("Invalid tbl->lq_type %d\n", tbl->lq_type);
521         }
522
523         rate_n_flags |=
524             ((tbl->ant_type << RATE_MCS_ANT_POS) & RATE_MCS_ANT_ABC_MSK);
525
526         if (is_Ht(tbl->lq_type)) {
527                 if (tbl->is_ht40) {
528                         if (tbl->is_dup)
529                                 rate_n_flags |= RATE_MCS_DUP_MSK;
530                         else
531                                 rate_n_flags |= RATE_MCS_HT40_MSK;
532                 }
533                 if (tbl->is_SGI)
534                         rate_n_flags |= RATE_MCS_SGI_MSK;
535
536                 if (use_green) {
537                         rate_n_flags |= RATE_MCS_GF_MSK;
538                         if (is_siso(tbl->lq_type) && tbl->is_SGI) {
539                                 rate_n_flags &= ~RATE_MCS_SGI_MSK;
540                                 IL_ERR("GF was set with SGI:SISO\n");
541                         }
542                 }
543         }
544         return rate_n_flags;
545 }
546
547 /*
548  * Interpret uCode API's rate_n_flags format,
549  * fill "search" or "active" tx mode table.
550  */
551 static int
552 il4965_rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
553                                 enum ieee80211_band band,
554                                 struct il_scale_tbl_info *tbl, int *rate_idx)
555 {
556         u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
557         u8 il4965_num_of_ant =
558             il4965_get_il4965_num_of_ant_from_rate(rate_n_flags);
559         u8 mcs;
560
561         memset(tbl, 0, sizeof(struct il_scale_tbl_info));
562         *rate_idx = il4965_hwrate_to_plcp_idx(rate_n_flags);
563
564         if (*rate_idx == RATE_INVALID) {
565                 *rate_idx = -1;
566                 return -EINVAL;
567         }
568         tbl->is_SGI = 0;        /* default legacy setup */
569         tbl->is_ht40 = 0;
570         tbl->is_dup = 0;
571         tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
572         tbl->lq_type = LQ_NONE;
573         tbl->max_search = IL_MAX_SEARCH;
574
575         /* legacy rate format */
576         if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
577                 if (il4965_num_of_ant == 1) {
578                         if (band == IEEE80211_BAND_5GHZ)
579                                 tbl->lq_type = LQ_A;
580                         else
581                                 tbl->lq_type = LQ_G;
582                 }
583                 /* HT rate format */
584         } else {
585                 if (rate_n_flags & RATE_MCS_SGI_MSK)
586                         tbl->is_SGI = 1;
587
588                 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
589                     (rate_n_flags & RATE_MCS_DUP_MSK))
590                         tbl->is_ht40 = 1;
591
592                 if (rate_n_flags & RATE_MCS_DUP_MSK)
593                         tbl->is_dup = 1;
594
595                 mcs = il4965_rs_extract_rate(rate_n_flags);
596
597                 /* SISO */
598                 if (mcs <= RATE_SISO_60M_PLCP) {
599                         if (il4965_num_of_ant == 1)
600                                 tbl->lq_type = LQ_SISO; /*else NONE */
601                         /* MIMO2 */
602                 } else {
603                         if (il4965_num_of_ant == 2)
604                                 tbl->lq_type = LQ_MIMO2;
605                 }
606         }
607         return 0;
608 }
609
610 /* switch to another antenna/antennas and return 1 */
611 /* if no other valid antenna found, return 0 */
612 static int
613 il4965_rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
614                          struct il_scale_tbl_info *tbl)
615 {
616         u8 new_ant_type;
617
618         if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
619                 return 0;
620
621         if (!il4965_rs_is_valid_ant(valid_ant, tbl->ant_type))
622                 return 0;
623
624         new_ant_type = ant_toggle_lookup[tbl->ant_type];
625
626         while (new_ant_type != tbl->ant_type &&
627                !il4965_rs_is_valid_ant(valid_ant, new_ant_type))
628                 new_ant_type = ant_toggle_lookup[new_ant_type];
629
630         if (new_ant_type == tbl->ant_type)
631                 return 0;
632
633         tbl->ant_type = new_ant_type;
634         *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
635         *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
636         return 1;
637 }
638
639 /**
640  * Green-field mode is valid if the station supports it and
641  * there are no non-GF stations present in the BSS.
642  */
643 static bool
644 il4965_rs_use_green(struct il_priv *il, struct ieee80211_sta *sta)
645 {
646         return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
647                !il->ht.non_gf_sta_present;
648 }
649
650 /**
651  * il4965_rs_get_supported_rates - get the available rates
652  *
653  * if management frame or broadcast frame only return
654  * basic available rates.
655  *
656  */
657 static u16
658 il4965_rs_get_supported_rates(struct il_lq_sta *lq_sta,
659                               struct ieee80211_hdr *hdr,
660                               enum il_table_type rate_type)
661 {
662         if (is_legacy(rate_type)) {
663                 return lq_sta->active_legacy_rate;
664         } else {
665                 if (is_siso(rate_type))
666                         return lq_sta->active_siso_rate;
667                 else
668                         return lq_sta->active_mimo2_rate;
669         }
670 }
671
672 static u16
673 il4965_rs_get_adjacent_rate(struct il_priv *il, u8 idx, u16 rate_mask,
674                             int rate_type)
675 {
676         u8 high = RATE_INVALID;
677         u8 low = RATE_INVALID;
678
679         /* 802.11A or ht walks to the next literal adjacent rate in
680          * the rate table */
681         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
682                 int i;
683                 u32 mask;
684
685                 /* Find the previous rate that is in the rate mask */
686                 i = idx - 1;
687                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
688                         if (rate_mask & mask) {
689                                 low = i;
690                                 break;
691                         }
692                 }
693
694                 /* Find the next rate that is in the rate mask */
695                 i = idx + 1;
696                 for (mask = (1 << i); i < RATE_COUNT; i++, mask <<= 1) {
697                         if (rate_mask & mask) {
698                                 high = i;
699                                 break;
700                         }
701                 }
702
703                 return (high << 8) | low;
704         }
705
706         low = idx;
707         while (low != RATE_INVALID) {
708                 low = il_rates[low].prev_rs;
709                 if (low == RATE_INVALID)
710                         break;
711                 if (rate_mask & (1 << low))
712                         break;
713                 D_RATE("Skipping masked lower rate: %d\n", low);
714         }
715
716         high = idx;
717         while (high != RATE_INVALID) {
718                 high = il_rates[high].next_rs;
719                 if (high == RATE_INVALID)
720                         break;
721                 if (rate_mask & (1 << high))
722                         break;
723                 D_RATE("Skipping masked higher rate: %d\n", high);
724         }
725
726         return (high << 8) | low;
727 }
728
729 static u32
730 il4965_rs_get_lower_rate(struct il_lq_sta *lq_sta,
731                          struct il_scale_tbl_info *tbl, u8 scale_idx,
732                          u8 ht_possible)
733 {
734         s32 low;
735         u16 rate_mask;
736         u16 high_low;
737         u8 switch_to_legacy = 0;
738         u8 is_green = lq_sta->is_green;
739         struct il_priv *il = lq_sta->drv;
740
741         /* check if we need to switch from HT to legacy rates.
742          * assumption is that mandatory rates (1Mbps or 6Mbps)
743          * are always supported (spec demand) */
744         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_idx)) {
745                 switch_to_legacy = 1;
746                 scale_idx = rs_ht_to_legacy[scale_idx];
747                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
748                         tbl->lq_type = LQ_A;
749                 else
750                         tbl->lq_type = LQ_G;
751
752                 if (il4965_num_of_ant(tbl->ant_type) > 1)
753                         tbl->ant_type =
754                             il4965_first_antenna(il->hw_params.valid_tx_ant);
755
756                 tbl->is_ht40 = 0;
757                 tbl->is_SGI = 0;
758                 tbl->max_search = IL_MAX_SEARCH;
759         }
760
761         rate_mask = il4965_rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
762
763         /* Mask with station rate restriction */
764         if (is_legacy(tbl->lq_type)) {
765                 /* supp_rates has no CCK bits in A mode */
766                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
767                         rate_mask =
768                             (u16) (rate_mask &
769                                    (lq_sta->supp_rates << IL_FIRST_OFDM_RATE));
770                 else
771                         rate_mask = (u16) (rate_mask & lq_sta->supp_rates);
772         }
773
774         /* If we switched from HT to legacy, check current rate */
775         if (switch_to_legacy && (rate_mask & (1 << scale_idx))) {
776                 low = scale_idx;
777                 goto out;
778         }
779
780         high_low =
781             il4965_rs_get_adjacent_rate(lq_sta->drv, scale_idx, rate_mask,
782                                         tbl->lq_type);
783         low = high_low & 0xff;
784
785         if (low == RATE_INVALID)
786                 low = scale_idx;
787
788 out:
789         return il4965_rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
790 }
791
792 /*
793  * Simple function to compare two rate scale table types
794  */
795 static bool
796 il4965_table_type_matches(struct il_scale_tbl_info *a,
797                           struct il_scale_tbl_info *b)
798 {
799         return (a->lq_type == b->lq_type && a->ant_type == b->ant_type &&
800                 a->is_SGI == b->is_SGI);
801 }
802
803 /*
804  * mac80211 sends us Tx status
805  */
806 static void
807 il4965_rs_tx_status(void *il_r, struct ieee80211_supported_band *sband,
808                     struct ieee80211_sta *sta, void *il_sta,
809                     struct sk_buff *skb)
810 {
811         int legacy_success;
812         int retries;
813         int rs_idx, mac_idx, i;
814         struct il_lq_sta *lq_sta = il_sta;
815         struct il_link_quality_cmd *table;
816         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
817         struct il_priv *il = (struct il_priv *)il_r;
818         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
819         enum mac80211_rate_control_flags mac_flags;
820         u32 tx_rate;
821         struct il_scale_tbl_info tbl_type;
822         struct il_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
823
824         D_RATE("get frame ack response, update rate scale win\n");
825
826         /* Treat uninitialized rate scaling data same as non-existing. */
827         if (!lq_sta) {
828                 D_RATE("Station rate scaling not created yet.\n");
829                 return;
830         } else if (!lq_sta->drv) {
831                 D_RATE("Rate scaling not initialized yet.\n");
832                 return;
833         }
834
835         if (!ieee80211_is_data(hdr->frame_control) ||
836             (info->flags & IEEE80211_TX_CTL_NO_ACK))
837                 return;
838
839         /* This packet was aggregated but doesn't carry status info */
840         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
841             !(info->flags & IEEE80211_TX_STAT_AMPDU))
842                 return;
843
844         /*
845          * Ignore this Tx frame response if its initial rate doesn't match
846          * that of latest Link Quality command.  There may be stragglers
847          * from a previous Link Quality command, but we're no longer interested
848          * in those; they're either from the "active" mode while we're trying
849          * to check "search" mode, or a prior "search" mode after we've moved
850          * to a new "search" mode (which might become the new "active" mode).
851          */
852         table = &lq_sta->lq;
853         tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
854         il4965_rs_get_tbl_info_from_mcs(tx_rate, il->band, &tbl_type, &rs_idx);
855         if (il->band == IEEE80211_BAND_5GHZ)
856                 rs_idx -= IL_FIRST_OFDM_RATE;
857         mac_flags = info->status.rates[0].flags;
858         mac_idx = info->status.rates[0].idx;
859         /* For HT packets, map MCS to PLCP */
860         if (mac_flags & IEEE80211_TX_RC_MCS) {
861                 mac_idx &= RATE_MCS_CODE_MSK;   /* Remove # of streams */
862                 if (mac_idx >= (RATE_9M_IDX - IL_FIRST_OFDM_RATE))
863                         mac_idx++;
864                 /*
865                  * mac80211 HT idx is always zero-idxed; we need to move
866                  * HT OFDM rates after CCK rates in 2.4 GHz band
867                  */
868                 if (il->band == IEEE80211_BAND_2GHZ)
869                         mac_idx += IL_FIRST_OFDM_RATE;
870         }
871         /* Here we actually compare this rate to the latest LQ command */
872         if (mac_idx < 0 ||
873             tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI) ||
874             tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH) ||
875             tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA) ||
876             tbl_type.ant_type != info->antenna_sel_tx ||
877             !!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)
878             || !!(tx_rate & RATE_MCS_GF_MSK) !=
879             !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD) || rs_idx != mac_idx) {
880                 D_RATE("initial rate %d does not match %d (0x%x)\n", mac_idx,
881                        rs_idx, tx_rate);
882                 /*
883                  * Since rates mis-match, the last LQ command may have failed.
884                  * After IL_MISSED_RATE_MAX mis-matches, resync the uCode with
885                  * ... driver.
886                  */
887                 lq_sta->missed_rate_counter++;
888                 if (lq_sta->missed_rate_counter > IL_MISSED_RATE_MAX) {
889                         lq_sta->missed_rate_counter = 0;
890                         il_send_lq_cmd(il, &lq_sta->lq, CMD_ASYNC, false);
891                 }
892                 /* Regardless, ignore this status info for outdated rate */
893                 return;
894         } else
895                 /* Rate did match, so reset the missed_rate_counter */
896                 lq_sta->missed_rate_counter = 0;
897
898         /* Figure out if rate scale algorithm is in active or search table */
899         if (il4965_table_type_matches
900             (&tbl_type, &(lq_sta->lq_info[lq_sta->active_tbl]))) {
901                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
902                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
903         } else
904             if (il4965_table_type_matches
905                 (&tbl_type, &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
906                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
907                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
908         } else {
909                 D_RATE("Neither active nor search matches tx rate\n");
910                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
911                 D_RATE("active- lq:%x, ant:%x, SGI:%d\n", tmp_tbl->lq_type,
912                        tmp_tbl->ant_type, tmp_tbl->is_SGI);
913                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
914                 D_RATE("search- lq:%x, ant:%x, SGI:%d\n", tmp_tbl->lq_type,
915                        tmp_tbl->ant_type, tmp_tbl->is_SGI);
916                 D_RATE("actual- lq:%x, ant:%x, SGI:%d\n", tbl_type.lq_type,
917                        tbl_type.ant_type, tbl_type.is_SGI);
918                 /*
919                  * no matching table found, let's by-pass the data collection
920                  * and continue to perform rate scale to find the rate table
921                  */
922                 il4965_rs_stay_in_table(lq_sta, true);
923                 goto done;
924         }
925
926         /*
927          * Updating the frame history depends on whether packets were
928          * aggregated.
929          *
930          * For aggregation, all packets were transmitted at the same rate, the
931          * first idx into rate scale table.
932          */
933         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
934                 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
935                 il4965_rs_get_tbl_info_from_mcs(tx_rate, il->band, &tbl_type,
936                                                 &rs_idx);
937                 il4965_rs_collect_tx_data(curr_tbl, rs_idx,
938                                           info->status.ampdu_len,
939                                           info->status.ampdu_ack_len);
940
941                 /* Update success/fail counts if not searching for new mode */
942                 if (lq_sta->stay_in_tbl) {
943                         lq_sta->total_success += info->status.ampdu_ack_len;
944                         lq_sta->total_failed +=
945                             (info->status.ampdu_len -
946                              info->status.ampdu_ack_len);
947                 }
948         } else {
949                 /*
950                  * For legacy, update frame history with for each Tx retry.
951                  */
952                 retries = info->status.rates[0].count - 1;
953                 /* HW doesn't send more than 15 retries */
954                 retries = min(retries, 15);
955
956                 /* The last transmission may have been successful */
957                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
958                 /* Collect data for each rate used during failed TX attempts */
959                 for (i = 0; i <= retries; ++i) {
960                         tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
961                         il4965_rs_get_tbl_info_from_mcs(tx_rate, il->band,
962                                                         &tbl_type, &rs_idx);
963                         /*
964                          * Only collect stats if retried rate is in the same RS
965                          * table as active/search.
966                          */
967                         if (il4965_table_type_matches(&tbl_type, curr_tbl))
968                                 tmp_tbl = curr_tbl;
969                         else if (il4965_table_type_matches
970                                  (&tbl_type, other_tbl))
971                                 tmp_tbl = other_tbl;
972                         else
973                                 continue;
974                         il4965_rs_collect_tx_data(tmp_tbl, rs_idx, 1,
975                                                   i <
976                                                   retries ? 0 : legacy_success);
977                 }
978
979                 /* Update success/fail counts if not searching for new mode */
980                 if (lq_sta->stay_in_tbl) {
981                         lq_sta->total_success += legacy_success;
982                         lq_sta->total_failed += retries + (1 - legacy_success);
983                 }
984         }
985         /* The last TX rate is cached in lq_sta; it's set in if/else above */
986         lq_sta->last_rate_n_flags = tx_rate;
987 done:
988         /* See if there's a better rate or modulation mode to try. */
989         if (sta->supp_rates[sband->band])
990                 il4965_rs_rate_scale_perform(il, skb, sta, lq_sta);
991 }
992
993 /*
994  * Begin a period of staying with a selected modulation mode.
995  * Set "stay_in_tbl" flag to prevent any mode switches.
996  * Set frame tx success limits according to legacy vs. high-throughput,
997  * and reset overall (spanning all rates) tx success history stats.
998  * These control how long we stay using same modulation mode before
999  * searching for a new mode.
1000  */
1001 static void
1002 il4965_rs_set_stay_in_table(struct il_priv *il, u8 is_legacy,
1003                             struct il_lq_sta *lq_sta)
1004 {
1005         D_RATE("we are staying in the same table\n");
1006         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
1007         if (is_legacy) {
1008                 lq_sta->table_count_limit = IL_LEGACY_TBL_COUNT;
1009                 lq_sta->max_failure_limit = IL_LEGACY_FAILURE_LIMIT;
1010                 lq_sta->max_success_limit = IL_LEGACY_SUCCESS_LIMIT;
1011         } else {
1012                 lq_sta->table_count_limit = IL_NONE_LEGACY_TBL_COUNT;
1013                 lq_sta->max_failure_limit = IL_NONE_LEGACY_FAILURE_LIMIT;
1014                 lq_sta->max_success_limit = IL_NONE_LEGACY_SUCCESS_LIMIT;
1015         }
1016         lq_sta->table_count = 0;
1017         lq_sta->total_failed = 0;
1018         lq_sta->total_success = 0;
1019         lq_sta->flush_timer = jiffies;
1020         lq_sta->action_counter = 0;
1021 }
1022
1023 /*
1024  * Find correct throughput table for given mode of modulation
1025  */
1026 static void
1027 il4965_rs_set_expected_tpt_table(struct il_lq_sta *lq_sta,
1028                                  struct il_scale_tbl_info *tbl)
1029 {
1030         /* Used to choose among HT tables */
1031         s32(*ht_tbl_pointer)[RATE_COUNT];
1032
1033         /* Check for invalid LQ type */
1034         if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1035                 tbl->expected_tpt = expected_tpt_legacy;
1036                 return;
1037         }
1038
1039         /* Legacy rates have only one table */
1040         if (is_legacy(tbl->lq_type)) {
1041                 tbl->expected_tpt = expected_tpt_legacy;
1042                 return;
1043         }
1044
1045         /* Choose among many HT tables depending on number of streams
1046          * (SISO/MIMO2), channel width (20/40), SGI, and aggregation
1047          * status */
1048         if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1049                 ht_tbl_pointer = expected_tpt_siso20MHz;
1050         else if (is_siso(tbl->lq_type))
1051                 ht_tbl_pointer = expected_tpt_siso40MHz;
1052         else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1053                 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1054         else                    /* if (is_mimo2(tbl->lq_type)) <-- must be true */
1055                 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1056
1057         if (!tbl->is_SGI && !lq_sta->is_agg)    /* Normal */
1058                 tbl->expected_tpt = ht_tbl_pointer[0];
1059         else if (tbl->is_SGI && !lq_sta->is_agg)        /* SGI */
1060                 tbl->expected_tpt = ht_tbl_pointer[1];
1061         else if (!tbl->is_SGI && lq_sta->is_agg)        /* AGG */
1062                 tbl->expected_tpt = ht_tbl_pointer[2];
1063         else                    /* AGG+SGI */
1064                 tbl->expected_tpt = ht_tbl_pointer[3];
1065 }
1066
1067 /*
1068  * Find starting rate for new "search" high-throughput mode of modulation.
1069  * Goal is to find lowest expected rate (under perfect conditions) that is
1070  * above the current measured throughput of "active" mode, to give new mode
1071  * a fair chance to prove itself without too many challenges.
1072  *
1073  * This gets called when transitioning to more aggressive modulation
1074  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1075  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1076  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1077  * bit rate will typically need to increase, but not if performance was bad.
1078  */
1079 static s32
1080 il4965_rs_get_best_rate(struct il_priv *il, struct il_lq_sta *lq_sta,
1081                         struct il_scale_tbl_info *tbl,  /* "search" */
1082                         u16 rate_mask, s8 idx)
1083 {
1084         /* "active" values */
1085         struct il_scale_tbl_info *active_tbl =
1086             &(lq_sta->lq_info[lq_sta->active_tbl]);
1087         s32 active_sr = active_tbl->win[idx].success_ratio;
1088         s32 active_tpt = active_tbl->expected_tpt[idx];
1089
1090         /* expected "search" throughput */
1091         s32 *tpt_tbl = tbl->expected_tpt;
1092
1093         s32 new_rate, high, low, start_hi;
1094         u16 high_low;
1095         s8 rate = idx;
1096
1097         new_rate = high = low = start_hi = RATE_INVALID;
1098
1099         for (;;) {
1100                 high_low =
1101                     il4965_rs_get_adjacent_rate(il, rate, rate_mask,
1102                                                 tbl->lq_type);
1103
1104                 low = high_low & 0xff;
1105                 high = (high_low >> 8) & 0xff;
1106
1107                 /*
1108                  * Lower the "search" bit rate, to give new "search" mode
1109                  * approximately the same throughput as "active" if:
1110                  *
1111                  * 1) "Active" mode has been working modestly well (but not
1112                  *    great), and expected "search" throughput (under perfect
1113                  *    conditions) at candidate rate is above the actual
1114                  *    measured "active" throughput (but less than expected
1115                  *    "active" throughput under perfect conditions).
1116                  * OR
1117                  * 2) "Active" mode has been working perfectly or very well
1118                  *    and expected "search" throughput (under perfect
1119                  *    conditions) at candidate rate is above expected
1120                  *    "active" throughput (under perfect conditions).
1121                  */
1122                 if ((100 * tpt_tbl[rate] > lq_sta->last_tpt &&
1123                      (active_sr > RATE_DECREASE_TH && active_sr <= RATE_HIGH_TH
1124                       && tpt_tbl[rate] <= active_tpt)) ||
1125                     (active_sr >= RATE_SCALE_SWITCH &&
1126                      tpt_tbl[rate] > active_tpt)) {
1127
1128                         /* (2nd or later pass)
1129                          * If we've already tried to raise the rate, and are
1130                          * now trying to lower it, use the higher rate. */
1131                         if (start_hi != RATE_INVALID) {
1132                                 new_rate = start_hi;
1133                                 break;
1134                         }
1135
1136                         new_rate = rate;
1137
1138                         /* Loop again with lower rate */
1139                         if (low != RATE_INVALID)
1140                                 rate = low;
1141
1142                         /* Lower rate not available, use the original */
1143                         else
1144                                 break;
1145
1146                         /* Else try to raise the "search" rate to match "active" */
1147                 } else {
1148                         /* (2nd or later pass)
1149                          * If we've already tried to lower the rate, and are
1150                          * now trying to raise it, use the lower rate. */
1151                         if (new_rate != RATE_INVALID)
1152                                 break;
1153
1154                         /* Loop again with higher rate */
1155                         else if (high != RATE_INVALID) {
1156                                 start_hi = high;
1157                                 rate = high;
1158
1159                                 /* Higher rate not available, use the original */
1160                         } else {
1161                                 new_rate = rate;
1162                                 break;
1163                         }
1164                 }
1165         }
1166
1167         return new_rate;
1168 }
1169
1170 /*
1171  * Set up search table for MIMO2
1172  */
1173 static int
1174 il4965_rs_switch_to_mimo2(struct il_priv *il, struct il_lq_sta *lq_sta,
1175                           struct ieee80211_conf *conf,
1176                           struct ieee80211_sta *sta,
1177                           struct il_scale_tbl_info *tbl, int idx)
1178 {
1179         u16 rate_mask;
1180         s32 rate;
1181         s8 is_green = lq_sta->is_green;
1182
1183         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1184                 return -1;
1185
1186         if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2) ==
1187             WLAN_HT_CAP_SM_PS_STATIC)
1188                 return -1;
1189
1190         /* Need both Tx chains/antennas to support MIMO */
1191         if (il->hw_params.tx_chains_num < 2)
1192                 return -1;
1193
1194         D_RATE("LQ: try to switch to MIMO2\n");
1195
1196         tbl->lq_type = LQ_MIMO2;
1197         tbl->is_dup = lq_sta->is_dup;
1198         tbl->action = 0;
1199         tbl->max_search = IL_MAX_SEARCH;
1200         rate_mask = lq_sta->active_mimo2_rate;
1201
1202         if (il_is_ht40_tx_allowed(il, &sta->ht_cap))
1203                 tbl->is_ht40 = 1;
1204         else
1205                 tbl->is_ht40 = 0;
1206
1207         il4965_rs_set_expected_tpt_table(lq_sta, tbl);
1208
1209         rate = il4965_rs_get_best_rate(il, lq_sta, tbl, rate_mask, idx);
1210
1211         D_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1212         if (rate == RATE_INVALID || !((1 << rate) & rate_mask)) {
1213                 D_RATE("Can't switch with idx %d rate mask %x\n", rate,
1214                        rate_mask);
1215                 return -1;
1216         }
1217         tbl->current_rate =
1218             il4965_rate_n_flags_from_tbl(il, tbl, rate, is_green);
1219
1220         D_RATE("LQ: Switch to new mcs %X idx is green %X\n", tbl->current_rate,
1221                is_green);
1222         return 0;
1223 }
1224
1225 /*
1226  * Set up search table for SISO
1227  */
1228 static int
1229 il4965_rs_switch_to_siso(struct il_priv *il, struct il_lq_sta *lq_sta,
1230                          struct ieee80211_conf *conf, struct ieee80211_sta *sta,
1231                          struct il_scale_tbl_info *tbl, int idx)
1232 {
1233         u16 rate_mask;
1234         u8 is_green = lq_sta->is_green;
1235         s32 rate;
1236
1237         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1238                 return -1;
1239
1240         D_RATE("LQ: try to switch to SISO\n");
1241
1242         tbl->is_dup = lq_sta->is_dup;
1243         tbl->lq_type = LQ_SISO;
1244         tbl->action = 0;
1245         tbl->max_search = IL_MAX_SEARCH;
1246         rate_mask = lq_sta->active_siso_rate;
1247
1248         if (il_is_ht40_tx_allowed(il, &sta->ht_cap))
1249                 tbl->is_ht40 = 1;
1250         else
1251                 tbl->is_ht40 = 0;
1252
1253         if (is_green)
1254                 tbl->is_SGI = 0;        /*11n spec: no SGI in SISO+Greenfield */
1255
1256         il4965_rs_set_expected_tpt_table(lq_sta, tbl);
1257         rate = il4965_rs_get_best_rate(il, lq_sta, tbl, rate_mask, idx);
1258
1259         D_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask);
1260         if (rate == RATE_INVALID || !((1 << rate) & rate_mask)) {
1261                 D_RATE("can not switch with idx %d rate mask %x\n", rate,
1262                        rate_mask);
1263                 return -1;
1264         }
1265         tbl->current_rate =
1266             il4965_rate_n_flags_from_tbl(il, tbl, rate, is_green);
1267         D_RATE("LQ: Switch to new mcs %X idx is green %X\n", tbl->current_rate,
1268                is_green);
1269         return 0;
1270 }
1271
1272 /*
1273  * Try to switch to new modulation mode from legacy
1274  */
1275 static int
1276 il4965_rs_move_legacy_other(struct il_priv *il, struct il_lq_sta *lq_sta,
1277                             struct ieee80211_conf *conf,
1278                             struct ieee80211_sta *sta, int idx)
1279 {
1280         struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1281         struct il_scale_tbl_info *search_tbl =
1282             &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1283         struct il_rate_scale_data *win = &(tbl->win[idx]);
1284         u32 sz =
1285             (sizeof(struct il_scale_tbl_info) -
1286              (sizeof(struct il_rate_scale_data) * RATE_COUNT));
1287         u8 start_action;
1288         u8 valid_tx_ant = il->hw_params.valid_tx_ant;
1289         u8 tx_chains_num = il->hw_params.tx_chains_num;
1290         int ret = 0;
1291         u8 update_search_tbl_counter = 0;
1292
1293         tbl->action = IL_LEGACY_SWITCH_SISO;
1294
1295         start_action = tbl->action;
1296         for (;;) {
1297                 lq_sta->action_counter++;
1298                 switch (tbl->action) {
1299                 case IL_LEGACY_SWITCH_ANTENNA1:
1300                 case IL_LEGACY_SWITCH_ANTENNA2:
1301                         D_RATE("LQ: Legacy toggle Antenna\n");
1302
1303                         if ((tbl->action == IL_LEGACY_SWITCH_ANTENNA1 &&
1304                              tx_chains_num <= 1) ||
1305                             (tbl->action == IL_LEGACY_SWITCH_ANTENNA2 &&
1306                              tx_chains_num <= 2))
1307                                 break;
1308
1309                         /* Don't change antenna if success has been great */
1310                         if (win->success_ratio >= IL_RS_GOOD_RATIO)
1311                                 break;
1312
1313                         /* Set up search table to try other antenna */
1314                         memcpy(search_tbl, tbl, sz);
1315
1316                         if (il4965_rs_toggle_antenna
1317                             (valid_tx_ant, &search_tbl->current_rate,
1318                              search_tbl)) {
1319                                 update_search_tbl_counter = 1;
1320                                 il4965_rs_set_expected_tpt_table(lq_sta,
1321                                                                  search_tbl);
1322                                 goto out;
1323                         }
1324                         break;
1325                 case IL_LEGACY_SWITCH_SISO:
1326                         D_RATE("LQ: Legacy switch to SISO\n");
1327
1328                         /* Set up search table to try SISO */
1329                         memcpy(search_tbl, tbl, sz);
1330                         search_tbl->is_SGI = 0;
1331                         ret =
1332                             il4965_rs_switch_to_siso(il, lq_sta, conf, sta,
1333                                                      search_tbl, idx);
1334                         if (!ret) {
1335                                 lq_sta->action_counter = 0;
1336                                 goto out;
1337                         }
1338
1339                         break;
1340                 case IL_LEGACY_SWITCH_MIMO2_AB:
1341                 case IL_LEGACY_SWITCH_MIMO2_AC:
1342                 case IL_LEGACY_SWITCH_MIMO2_BC:
1343                         D_RATE("LQ: Legacy switch to MIMO2\n");
1344
1345                         /* Set up search table to try MIMO */
1346                         memcpy(search_tbl, tbl, sz);
1347                         search_tbl->is_SGI = 0;
1348
1349                         if (tbl->action == IL_LEGACY_SWITCH_MIMO2_AB)
1350                                 search_tbl->ant_type = ANT_AB;
1351                         else if (tbl->action == IL_LEGACY_SWITCH_MIMO2_AC)
1352                                 search_tbl->ant_type = ANT_AC;
1353                         else
1354                                 search_tbl->ant_type = ANT_BC;
1355
1356                         if (!il4965_rs_is_valid_ant
1357                             (valid_tx_ant, search_tbl->ant_type))
1358                                 break;
1359
1360                         ret =
1361                             il4965_rs_switch_to_mimo2(il, lq_sta, conf, sta,
1362                                                       search_tbl, idx);
1363                         if (!ret) {
1364                                 lq_sta->action_counter = 0;
1365                                 goto out;
1366                         }
1367                         break;
1368                 }
1369                 tbl->action++;
1370                 if (tbl->action > IL_LEGACY_SWITCH_MIMO2_BC)
1371                         tbl->action = IL_LEGACY_SWITCH_ANTENNA1;
1372
1373                 if (tbl->action == start_action)
1374                         break;
1375
1376         }
1377         search_tbl->lq_type = LQ_NONE;
1378         return 0;
1379
1380 out:
1381         lq_sta->search_better_tbl = 1;
1382         tbl->action++;
1383         if (tbl->action > IL_LEGACY_SWITCH_MIMO2_BC)
1384                 tbl->action = IL_LEGACY_SWITCH_ANTENNA1;
1385         if (update_search_tbl_counter)
1386                 search_tbl->action = tbl->action;
1387         return 0;
1388
1389 }
1390
1391 /*
1392  * Try to switch to new modulation mode from SISO
1393  */
1394 static int
1395 il4965_rs_move_siso_to_other(struct il_priv *il, struct il_lq_sta *lq_sta,
1396                              struct ieee80211_conf *conf,
1397                              struct ieee80211_sta *sta, int idx)
1398 {
1399         u8 is_green = lq_sta->is_green;
1400         struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1401         struct il_scale_tbl_info *search_tbl =
1402             &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1403         struct il_rate_scale_data *win = &(tbl->win[idx]);
1404         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1405         u32 sz =
1406             (sizeof(struct il_scale_tbl_info) -
1407              (sizeof(struct il_rate_scale_data) * RATE_COUNT));
1408         u8 start_action;
1409         u8 valid_tx_ant = il->hw_params.valid_tx_ant;
1410         u8 tx_chains_num = il->hw_params.tx_chains_num;
1411         u8 update_search_tbl_counter = 0;
1412         int ret;
1413
1414         start_action = tbl->action;
1415
1416         for (;;) {
1417                 lq_sta->action_counter++;
1418                 switch (tbl->action) {
1419                 case IL_SISO_SWITCH_ANTENNA1:
1420                 case IL_SISO_SWITCH_ANTENNA2:
1421                         D_RATE("LQ: SISO toggle Antenna\n");
1422                         if ((tbl->action == IL_SISO_SWITCH_ANTENNA1 &&
1423                              tx_chains_num <= 1) ||
1424                             (tbl->action == IL_SISO_SWITCH_ANTENNA2 &&
1425                              tx_chains_num <= 2))
1426                                 break;
1427
1428                         if (win->success_ratio >= IL_RS_GOOD_RATIO)
1429                                 break;
1430
1431                         memcpy(search_tbl, tbl, sz);
1432                         if (il4965_rs_toggle_antenna
1433                             (valid_tx_ant, &search_tbl->current_rate,
1434                              search_tbl)) {
1435                                 update_search_tbl_counter = 1;
1436                                 goto out;
1437                         }
1438                         break;
1439                 case IL_SISO_SWITCH_MIMO2_AB:
1440                 case IL_SISO_SWITCH_MIMO2_AC:
1441                 case IL_SISO_SWITCH_MIMO2_BC:
1442                         D_RATE("LQ: SISO switch to MIMO2\n");
1443                         memcpy(search_tbl, tbl, sz);
1444                         search_tbl->is_SGI = 0;
1445
1446                         if (tbl->action == IL_SISO_SWITCH_MIMO2_AB)
1447                                 search_tbl->ant_type = ANT_AB;
1448                         else if (tbl->action == IL_SISO_SWITCH_MIMO2_AC)
1449                                 search_tbl->ant_type = ANT_AC;
1450                         else
1451                                 search_tbl->ant_type = ANT_BC;
1452
1453                         if (!il4965_rs_is_valid_ant
1454                             (valid_tx_ant, search_tbl->ant_type))
1455                                 break;
1456
1457                         ret =
1458                             il4965_rs_switch_to_mimo2(il, lq_sta, conf, sta,
1459                                                       search_tbl, idx);
1460                         if (!ret)
1461                                 goto out;
1462                         break;
1463                 case IL_SISO_SWITCH_GI:
1464                         if (!tbl->is_ht40 &&
1465                             !(ht_cap->cap & IEEE80211_HT_CAP_SGI_20))
1466                                 break;
1467                         if (tbl->is_ht40 &&
1468                             !(ht_cap->cap & IEEE80211_HT_CAP_SGI_40))
1469                                 break;
1470
1471                         D_RATE("LQ: SISO toggle SGI/NGI\n");
1472
1473                         memcpy(search_tbl, tbl, sz);
1474                         if (is_green) {
1475                                 if (!tbl->is_SGI)
1476                                         break;
1477                                 else
1478                                         IL_ERR("SGI was set in GF+SISO\n");
1479                         }
1480                         search_tbl->is_SGI = !tbl->is_SGI;
1481                         il4965_rs_set_expected_tpt_table(lq_sta, search_tbl);
1482                         if (tbl->is_SGI) {
1483                                 s32 tpt = lq_sta->last_tpt / 100;
1484                                 if (tpt >= search_tbl->expected_tpt[idx])
1485                                         break;
1486                         }
1487                         search_tbl->current_rate =
1488                             il4965_rate_n_flags_from_tbl(il, search_tbl, idx,
1489                                                          is_green);
1490                         update_search_tbl_counter = 1;
1491                         goto out;
1492                 }
1493                 tbl->action++;
1494                 if (tbl->action > IL_SISO_SWITCH_GI)
1495                         tbl->action = IL_SISO_SWITCH_ANTENNA1;
1496
1497                 if (tbl->action == start_action)
1498                         break;
1499         }
1500         search_tbl->lq_type = LQ_NONE;
1501         return 0;
1502
1503 out:
1504         lq_sta->search_better_tbl = 1;
1505         tbl->action++;
1506         if (tbl->action > IL_SISO_SWITCH_GI)
1507                 tbl->action = IL_SISO_SWITCH_ANTENNA1;
1508         if (update_search_tbl_counter)
1509                 search_tbl->action = tbl->action;
1510
1511         return 0;
1512 }
1513
1514 /*
1515  * Try to switch to new modulation mode from MIMO2
1516  */
1517 static int
1518 il4965_rs_move_mimo2_to_other(struct il_priv *il, struct il_lq_sta *lq_sta,
1519                               struct ieee80211_conf *conf,
1520                               struct ieee80211_sta *sta, int idx)
1521 {
1522         s8 is_green = lq_sta->is_green;
1523         struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1524         struct il_scale_tbl_info *search_tbl =
1525             &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1526         struct il_rate_scale_data *win = &(tbl->win[idx]);
1527         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1528         u32 sz =
1529             (sizeof(struct il_scale_tbl_info) -
1530              (sizeof(struct il_rate_scale_data) * RATE_COUNT));
1531         u8 start_action;
1532         u8 valid_tx_ant = il->hw_params.valid_tx_ant;
1533         u8 tx_chains_num = il->hw_params.tx_chains_num;
1534         u8 update_search_tbl_counter = 0;
1535         int ret;
1536
1537         start_action = tbl->action;
1538         for (;;) {
1539                 lq_sta->action_counter++;
1540                 switch (tbl->action) {
1541                 case IL_MIMO2_SWITCH_ANTENNA1:
1542                 case IL_MIMO2_SWITCH_ANTENNA2:
1543                         D_RATE("LQ: MIMO2 toggle Antennas\n");
1544
1545                         if (tx_chains_num <= 2)
1546                                 break;
1547
1548                         if (win->success_ratio >= IL_RS_GOOD_RATIO)
1549                                 break;
1550
1551                         memcpy(search_tbl, tbl, sz);
1552                         if (il4965_rs_toggle_antenna
1553                             (valid_tx_ant, &search_tbl->current_rate,
1554                              search_tbl)) {
1555                                 update_search_tbl_counter = 1;
1556                                 goto out;
1557                         }
1558                         break;
1559                 case IL_MIMO2_SWITCH_SISO_A:
1560                 case IL_MIMO2_SWITCH_SISO_B:
1561                 case IL_MIMO2_SWITCH_SISO_C:
1562                         D_RATE("LQ: MIMO2 switch to SISO\n");
1563
1564                         /* Set up new search table for SISO */
1565                         memcpy(search_tbl, tbl, sz);
1566
1567                         if (tbl->action == IL_MIMO2_SWITCH_SISO_A)
1568                                 search_tbl->ant_type = ANT_A;
1569                         else if (tbl->action == IL_MIMO2_SWITCH_SISO_B)
1570                                 search_tbl->ant_type = ANT_B;
1571                         else
1572                                 search_tbl->ant_type = ANT_C;
1573
1574                         if (!il4965_rs_is_valid_ant
1575                             (valid_tx_ant, search_tbl->ant_type))
1576                                 break;
1577
1578                         ret =
1579                             il4965_rs_switch_to_siso(il, lq_sta, conf, sta,
1580                                                      search_tbl, idx);
1581                         if (!ret)
1582                                 goto out;
1583
1584                         break;
1585
1586                 case IL_MIMO2_SWITCH_GI:
1587                         if (!tbl->is_ht40 &&
1588                             !(ht_cap->cap & IEEE80211_HT_CAP_SGI_20))
1589                                 break;
1590                         if (tbl->is_ht40 &&
1591                             !(ht_cap->cap & IEEE80211_HT_CAP_SGI_40))
1592                                 break;
1593
1594                         D_RATE("LQ: MIMO2 toggle SGI/NGI\n");
1595
1596                         /* Set up new search table for MIMO2 */
1597                         memcpy(search_tbl, tbl, sz);
1598                         search_tbl->is_SGI = !tbl->is_SGI;
1599                         il4965_rs_set_expected_tpt_table(lq_sta, search_tbl);
1600                         /*
1601                          * If active table already uses the fastest possible
1602                          * modulation (dual stream with short guard interval),
1603                          * and it's working well, there's no need to look
1604                          * for a better type of modulation!
1605                          */
1606                         if (tbl->is_SGI) {
1607                                 s32 tpt = lq_sta->last_tpt / 100;
1608                                 if (tpt >= search_tbl->expected_tpt[idx])
1609                                         break;
1610                         }
1611                         search_tbl->current_rate =
1612                             il4965_rate_n_flags_from_tbl(il, search_tbl, idx,
1613                                                          is_green);
1614                         update_search_tbl_counter = 1;
1615                         goto out;
1616
1617                 }
1618                 tbl->action++;
1619                 if (tbl->action > IL_MIMO2_SWITCH_GI)
1620                         tbl->action = IL_MIMO2_SWITCH_ANTENNA1;
1621
1622                 if (tbl->action == start_action)
1623                         break;
1624         }
1625         search_tbl->lq_type = LQ_NONE;
1626         return 0;
1627 out:
1628         lq_sta->search_better_tbl = 1;
1629         tbl->action++;
1630         if (tbl->action > IL_MIMO2_SWITCH_GI)
1631                 tbl->action = IL_MIMO2_SWITCH_ANTENNA1;
1632         if (update_search_tbl_counter)
1633                 search_tbl->action = tbl->action;
1634
1635         return 0;
1636
1637 }
1638
1639 /*
1640  * Check whether we should continue using same modulation mode, or
1641  * begin search for a new mode, based on:
1642  * 1) # tx successes or failures while using this mode
1643  * 2) # times calling this function
1644  * 3) elapsed time in this mode (not used, for now)
1645  */
1646 static void
1647 il4965_rs_stay_in_table(struct il_lq_sta *lq_sta, bool force_search)
1648 {
1649         struct il_scale_tbl_info *tbl;
1650         int i;
1651         int active_tbl;
1652         int flush_interval_passed = 0;
1653         struct il_priv *il;
1654
1655         il = lq_sta->drv;
1656         active_tbl = lq_sta->active_tbl;
1657
1658         tbl = &(lq_sta->lq_info[active_tbl]);
1659
1660         /* If we've been disallowing search, see if we should now allow it */
1661         if (lq_sta->stay_in_tbl) {
1662
1663                 /* Elapsed time using current modulation mode */
1664                 if (lq_sta->flush_timer)
1665                         flush_interval_passed =
1666                             time_after(jiffies,
1667                                        (unsigned long)(lq_sta->flush_timer +
1668                                                        RATE_SCALE_FLUSH_INTVL));
1669
1670                 /*
1671                  * Check if we should allow search for new modulation mode.
1672                  * If many frames have failed or succeeded, or we've used
1673                  * this same modulation for a long time, allow search, and
1674                  * reset history stats that keep track of whether we should
1675                  * allow a new search.  Also (below) reset all bitmaps and
1676                  * stats in active history.
1677                  */
1678                 if (force_search ||
1679                     lq_sta->total_failed > lq_sta->max_failure_limit ||
1680                     lq_sta->total_success > lq_sta->max_success_limit ||
1681                     (!lq_sta->search_better_tbl && lq_sta->flush_timer &&
1682                      flush_interval_passed)) {
1683                         D_RATE("LQ: stay is expired %d %d %d\n:",
1684                                lq_sta->total_failed, lq_sta->total_success,
1685                                flush_interval_passed);
1686
1687                         /* Allow search for new mode */
1688                         lq_sta->stay_in_tbl = 0;        /* only place reset */
1689                         lq_sta->total_failed = 0;
1690                         lq_sta->total_success = 0;
1691                         lq_sta->flush_timer = 0;
1692
1693                         /*
1694                          * Else if we've used this modulation mode enough repetitions
1695                          * (regardless of elapsed time or success/failure), reset
1696                          * history bitmaps and rate-specific stats for all rates in
1697                          * active table.
1698                          */
1699                 } else {
1700                         lq_sta->table_count++;
1701                         if (lq_sta->table_count >= lq_sta->table_count_limit) {
1702                                 lq_sta->table_count = 0;
1703
1704                                 D_RATE("LQ: stay in table clear win\n");
1705                                 for (i = 0; i < RATE_COUNT; i++)
1706                                         il4965_rs_rate_scale_clear_win(&
1707                                                                        (tbl->
1708                                                                         win
1709                                                                         [i]));
1710                         }
1711                 }
1712
1713                 /* If transitioning to allow "search", reset all history
1714                  * bitmaps and stats in active table (this will become the new
1715                  * "search" table). */
1716                 if (!lq_sta->stay_in_tbl) {
1717                         for (i = 0; i < RATE_COUNT; i++)
1718                                 il4965_rs_rate_scale_clear_win(&(tbl->win[i]));
1719                 }
1720         }
1721 }
1722
1723 /*
1724  * setup rate table in uCode
1725  */
1726 static void
1727 il4965_rs_update_rate_tbl(struct il_priv *il, struct il_lq_sta *lq_sta,
1728                           struct il_scale_tbl_info *tbl, int idx, u8 is_green)
1729 {
1730         u32 rate;
1731
1732         /* Update uCode's rate table. */
1733         rate = il4965_rate_n_flags_from_tbl(il, tbl, idx, is_green);
1734         il4965_rs_fill_link_cmd(il, lq_sta, rate);
1735         il_send_lq_cmd(il, &lq_sta->lq, CMD_ASYNC, false);
1736 }
1737
1738 /*
1739  * Do rate scaling and search for new modulation mode.
1740  */
1741 static void
1742 il4965_rs_rate_scale_perform(struct il_priv *il, struct sk_buff *skb,
1743                              struct ieee80211_sta *sta,
1744                              struct il_lq_sta *lq_sta)
1745 {
1746         struct ieee80211_hw *hw = il->hw;
1747         struct ieee80211_conf *conf = &hw->conf;
1748         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1749         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1750         int low = RATE_INVALID;
1751         int high = RATE_INVALID;
1752         int idx;
1753         int i;
1754         struct il_rate_scale_data *win = NULL;
1755         int current_tpt = IL_INVALID_VALUE;
1756         int low_tpt = IL_INVALID_VALUE;
1757         int high_tpt = IL_INVALID_VALUE;
1758         u32 fail_count;
1759         s8 scale_action = 0;
1760         u16 rate_mask;
1761         u8 update_lq = 0;
1762         struct il_scale_tbl_info *tbl, *tbl1;
1763         u16 rate_scale_idx_msk = 0;
1764         u8 is_green = 0;
1765         u8 active_tbl = 0;
1766         u8 done_search = 0;
1767         u16 high_low;
1768         s32 sr;
1769         u8 tid = MAX_TID_COUNT;
1770         struct il_tid_data *tid_data;
1771
1772         D_RATE("rate scale calculate new rate for skb\n");
1773
1774         /* Send management frames and NO_ACK data using lowest rate. */
1775         /* TODO: this could probably be improved.. */
1776         if (!ieee80211_is_data(hdr->frame_control) ||
1777             (info->flags & IEEE80211_TX_CTL_NO_ACK))
1778                 return;
1779
1780         lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
1781
1782         tid = il4965_rs_tl_add_packet(lq_sta, hdr);
1783         if (tid != MAX_TID_COUNT && (lq_sta->tx_agg_tid_en & (1 << tid))) {
1784                 tid_data = &il->stations[lq_sta->lq.sta_id].tid[tid];
1785                 if (tid_data->agg.state == IL_AGG_OFF)
1786                         lq_sta->is_agg = 0;
1787                 else
1788                         lq_sta->is_agg = 1;
1789         } else
1790                 lq_sta->is_agg = 0;
1791
1792         /*
1793          * Select rate-scale / modulation-mode table to work with in
1794          * the rest of this function:  "search" if searching for better
1795          * modulation mode, or "active" if doing rate scaling within a mode.
1796          */
1797         if (!lq_sta->search_better_tbl)
1798                 active_tbl = lq_sta->active_tbl;
1799         else
1800                 active_tbl = 1 - lq_sta->active_tbl;
1801
1802         tbl = &(lq_sta->lq_info[active_tbl]);
1803         if (is_legacy(tbl->lq_type))
1804                 lq_sta->is_green = 0;
1805         else
1806                 lq_sta->is_green = il4965_rs_use_green(il, sta);
1807         is_green = lq_sta->is_green;
1808
1809         /* current tx rate */
1810         idx = lq_sta->last_txrate_idx;
1811
1812         D_RATE("Rate scale idx %d for type %d\n", idx, tbl->lq_type);
1813
1814         /* rates available for this association, and for modulation mode */
1815         rate_mask = il4965_rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
1816
1817         D_RATE("mask 0x%04X\n", rate_mask);
1818
1819         /* mask with station rate restriction */
1820         if (is_legacy(tbl->lq_type)) {
1821                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1822                         /* supp_rates has no CCK bits in A mode */
1823                         rate_scale_idx_msk =
1824                             (u16) (rate_mask &
1825                                    (lq_sta->supp_rates << IL_FIRST_OFDM_RATE));
1826                 else
1827                         rate_scale_idx_msk =
1828                             (u16) (rate_mask & lq_sta->supp_rates);
1829
1830         } else
1831                 rate_scale_idx_msk = rate_mask;
1832
1833         if (!rate_scale_idx_msk)
1834                 rate_scale_idx_msk = rate_mask;
1835
1836         if (!((1 << idx) & rate_scale_idx_msk)) {
1837                 IL_ERR("Current Rate is not valid\n");
1838                 if (lq_sta->search_better_tbl) {
1839                         /* revert to active table if search table is not valid */
1840                         tbl->lq_type = LQ_NONE;
1841                         lq_sta->search_better_tbl = 0;
1842                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1843                         /* get "active" rate info */
1844                         idx = il4965_hwrate_to_plcp_idx(tbl->current_rate);
1845                         il4965_rs_update_rate_tbl(il, lq_sta, tbl, idx,
1846                                                       is_green);
1847                 }
1848                 return;
1849         }
1850
1851         /* Get expected throughput table and history win for current rate */
1852         if (!tbl->expected_tpt) {
1853                 IL_ERR("tbl->expected_tpt is NULL\n");
1854                 return;
1855         }
1856
1857         /* force user max rate if set by user */
1858         if (lq_sta->max_rate_idx != -1 && lq_sta->max_rate_idx < idx) {
1859                 idx = lq_sta->max_rate_idx;
1860                 update_lq = 1;
1861                 win = &(tbl->win[idx]);
1862                 goto lq_update;
1863         }
1864
1865         win = &(tbl->win[idx]);
1866
1867         /*
1868          * If there is not enough history to calculate actual average
1869          * throughput, keep analyzing results of more tx frames, without
1870          * changing rate or mode (bypass most of the rest of this function).
1871          * Set up new rate table in uCode only if old rate is not supported
1872          * in current association (use new rate found above).
1873          */
1874         fail_count = win->counter - win->success_counter;
1875         if (fail_count < RATE_MIN_FAILURE_TH &&
1876             win->success_counter < RATE_MIN_SUCCESS_TH) {
1877                 D_RATE("LQ: still below TH. succ=%d total=%d " "for idx %d\n",
1878                        win->success_counter, win->counter, idx);
1879
1880                 /* Can't calculate this yet; not enough history */
1881                 win->average_tpt = IL_INVALID_VALUE;
1882
1883                 /* Should we stay with this modulation mode,
1884                  * or search for a new one? */
1885                 il4965_rs_stay_in_table(lq_sta, false);
1886
1887                 goto out;
1888         }
1889         /* Else we have enough samples; calculate estimate of
1890          * actual average throughput */
1891         if (win->average_tpt !=
1892             ((win->success_ratio * tbl->expected_tpt[idx] + 64) / 128)) {
1893                 IL_ERR("expected_tpt should have been calculated by now\n");
1894                 win->average_tpt =
1895                     ((win->success_ratio * tbl->expected_tpt[idx] + 64) / 128);
1896         }
1897
1898         /* If we are searching for better modulation mode, check success. */
1899         if (lq_sta->search_better_tbl) {
1900                 /* If good success, continue using the "search" mode;
1901                  * no need to send new link quality command, since we're
1902                  * continuing to use the setup that we've been trying. */
1903                 if (win->average_tpt > lq_sta->last_tpt) {
1904
1905                         D_RATE("LQ: SWITCHING TO NEW TBL "
1906                                "suc=%d cur-tpt=%d old-tpt=%d\n",
1907                                win->success_ratio, win->average_tpt,
1908                                lq_sta->last_tpt);
1909
1910                         if (!is_legacy(tbl->lq_type))
1911                                 lq_sta->enable_counter = 1;
1912
1913                         /* Swap tables; "search" becomes "active" */
1914                         lq_sta->active_tbl = active_tbl;
1915                         current_tpt = win->average_tpt;
1916
1917                         /* Else poor success; go back to mode in "active" table */
1918                 } else {
1919
1920                         D_RATE("LQ: GOING BACK TO THE OLD TBL "
1921                                "suc=%d cur-tpt=%d old-tpt=%d\n",
1922                                win->success_ratio, win->average_tpt,
1923                                lq_sta->last_tpt);
1924
1925                         /* Nullify "search" table */
1926                         tbl->lq_type = LQ_NONE;
1927
1928                         /* Revert to "active" table */
1929                         active_tbl = lq_sta->active_tbl;
1930                         tbl = &(lq_sta->lq_info[active_tbl]);
1931
1932                         /* Revert to "active" rate and throughput info */
1933                         idx = il4965_hwrate_to_plcp_idx(tbl->current_rate);
1934                         current_tpt = lq_sta->last_tpt;
1935
1936                         /* Need to set up a new rate table in uCode */
1937                         update_lq = 1;
1938                 }
1939
1940                 /* Either way, we've made a decision; modulation mode
1941                  * search is done, allow rate adjustment next time. */
1942                 lq_sta->search_better_tbl = 0;
1943                 done_search = 1;        /* Don't switch modes below! */
1944                 goto lq_update;
1945         }
1946
1947         /* (Else) not in search of better modulation mode, try for better
1948          * starting rate, while staying in this mode. */
1949         high_low =
1950             il4965_rs_get_adjacent_rate(il, idx, rate_scale_idx_msk,
1951                                         tbl->lq_type);
1952         low = high_low & 0xff;
1953         high = (high_low >> 8) & 0xff;
1954
1955         /* If user set max rate, dont allow higher than user constrain */
1956         if (lq_sta->max_rate_idx != -1 && lq_sta->max_rate_idx < high)
1957                 high = RATE_INVALID;
1958
1959         sr = win->success_ratio;
1960
1961         /* Collect measured throughputs for current and adjacent rates */
1962         current_tpt = win->average_tpt;
1963         if (low != RATE_INVALID)
1964                 low_tpt = tbl->win[low].average_tpt;
1965         if (high != RATE_INVALID)
1966                 high_tpt = tbl->win[high].average_tpt;
1967
1968         scale_action = 0;
1969
1970         /* Too many failures, decrease rate */
1971         if (sr <= RATE_DECREASE_TH || current_tpt == 0) {
1972                 D_RATE("decrease rate because of low success_ratio\n");
1973                 scale_action = -1;
1974
1975                 /* No throughput measured yet for adjacent rates; try increase. */
1976         } else if (low_tpt == IL_INVALID_VALUE && high_tpt == IL_INVALID_VALUE) {
1977
1978                 if (high != RATE_INVALID && sr >= RATE_INCREASE_TH)
1979                         scale_action = 1;
1980                 else if (low != RATE_INVALID)
1981                         scale_action = 0;
1982         }
1983
1984         /* Both adjacent throughputs are measured, but neither one has better
1985          * throughput; we're using the best rate, don't change it! */
1986         else if (low_tpt != IL_INVALID_VALUE && high_tpt != IL_INVALID_VALUE &&
1987                  low_tpt < current_tpt && high_tpt < current_tpt)
1988                 scale_action = 0;
1989
1990         /* At least one adjacent rate's throughput is measured,
1991          * and may have better performance. */
1992         else {
1993                 /* Higher adjacent rate's throughput is measured */
1994                 if (high_tpt != IL_INVALID_VALUE) {
1995                         /* Higher rate has better throughput */
1996                         if (high_tpt > current_tpt && sr >= RATE_INCREASE_TH)
1997                                 scale_action = 1;
1998                         else
1999                                 scale_action = 0;
2000
2001                         /* Lower adjacent rate's throughput is measured */
2002                 } else if (low_tpt != IL_INVALID_VALUE) {
2003                         /* Lower rate has better throughput */
2004                         if (low_tpt > current_tpt) {
2005                                 D_RATE("decrease rate because of low tpt\n");
2006                                 scale_action = -1;
2007                         } else if (sr >= RATE_INCREASE_TH) {
2008                                 scale_action = 1;
2009                         }
2010                 }
2011         }
2012
2013         /* Sanity check; asked for decrease, but success rate or throughput
2014          * has been good at old rate.  Don't change it. */
2015         if (scale_action == -1 && low != RATE_INVALID &&
2016             (sr > RATE_HIGH_TH || current_tpt > 100 * tbl->expected_tpt[low]))
2017                 scale_action = 0;
2018
2019         switch (scale_action) {
2020         case -1:
2021                 /* Decrease starting rate, update uCode's rate table */
2022                 if (low != RATE_INVALID) {
2023                         update_lq = 1;
2024                         idx = low;
2025                 }
2026
2027                 break;
2028         case 1:
2029                 /* Increase starting rate, update uCode's rate table */
2030                 if (high != RATE_INVALID) {
2031                         update_lq = 1;
2032                         idx = high;
2033                 }
2034
2035                 break;
2036         case 0:
2037                 /* No change */
2038         default:
2039                 break;
2040         }
2041
2042         D_RATE("choose rate scale idx %d action %d low %d " "high %d type %d\n",
2043                idx, scale_action, low, high, tbl->lq_type);
2044
2045 lq_update:
2046         /* Replace uCode's rate table for the destination station. */
2047         if (update_lq)
2048                 il4965_rs_update_rate_tbl(il, lq_sta, tbl, idx, is_green);
2049
2050         /* Should we stay with this modulation mode,
2051          * or search for a new one? */
2052         il4965_rs_stay_in_table(lq_sta, false);
2053
2054         /*
2055          * Search for new modulation mode if we're:
2056          * 1)  Not changing rates right now
2057          * 2)  Not just finishing up a search
2058          * 3)  Allowing a new search
2059          */
2060         if (!update_lq && !done_search && !lq_sta->stay_in_tbl && win->counter) {
2061                 /* Save current throughput to compare with "search" throughput */
2062                 lq_sta->last_tpt = current_tpt;
2063
2064                 /* Select a new "search" modulation mode to try.
2065                  * If one is found, set up the new "search" table. */
2066                 if (is_legacy(tbl->lq_type))
2067                         il4965_rs_move_legacy_other(il, lq_sta, conf, sta, idx);
2068                 else if (is_siso(tbl->lq_type))
2069                         il4965_rs_move_siso_to_other(il, lq_sta, conf, sta,
2070                                                      idx);
2071                 else            /* (is_mimo2(tbl->lq_type)) */
2072                         il4965_rs_move_mimo2_to_other(il, lq_sta, conf, sta,
2073                                                       idx);
2074
2075                 /* If new "search" mode was selected, set up in uCode table */
2076                 if (lq_sta->search_better_tbl) {
2077                         /* Access the "search" table, clear its history. */
2078                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2079                         for (i = 0; i < RATE_COUNT; i++)
2080                                 il4965_rs_rate_scale_clear_win(&(tbl->win[i]));
2081
2082                         /* Use new "search" start rate */
2083                         idx = il4965_hwrate_to_plcp_idx(tbl->current_rate);
2084
2085                         D_RATE("Switch current  mcs: %X idx: %d\n",
2086                                tbl->current_rate, idx);
2087                         il4965_rs_fill_link_cmd(il, lq_sta, tbl->current_rate);
2088                         il_send_lq_cmd(il, &lq_sta->lq, CMD_ASYNC, false);
2089                 } else
2090                         done_search = 1;
2091         }
2092
2093         if (done_search && !lq_sta->stay_in_tbl) {
2094                 /* If the "active" (non-search) mode was legacy,
2095                  * and we've tried switching antennas,
2096                  * but we haven't been able to try HT modes (not available),
2097                  * stay with best antenna legacy modulation for a while
2098                  * before next round of mode comparisons. */
2099                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2100                 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2101                     lq_sta->action_counter > tbl1->max_search) {
2102                         D_RATE("LQ: STAY in legacy table\n");
2103                         il4965_rs_set_stay_in_table(il, 1, lq_sta);
2104                 }
2105
2106                 /* If we're in an HT mode, and all 3 mode switch actions
2107                  * have been tried and compared, stay in this best modulation
2108                  * mode for a while before next round of mode comparisons. */
2109                 if (lq_sta->enable_counter &&
2110                     lq_sta->action_counter >= tbl1->max_search) {
2111                         if (lq_sta->last_tpt > IL_AGG_TPT_THREHOLD &&
2112                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2113                             tid != MAX_TID_COUNT) {
2114                                 tid_data =
2115                                     &il->stations[lq_sta->lq.sta_id].tid[tid];
2116                                 if (tid_data->agg.state == IL_AGG_OFF) {
2117                                         D_RATE("try to aggregate tid %d\n",
2118                                                tid);
2119                                         il4965_rs_tl_turn_on_agg(il, tid,
2120                                                                  lq_sta, sta);
2121                                 }
2122                         }
2123                         il4965_rs_set_stay_in_table(il, 0, lq_sta);
2124                 }
2125         }
2126
2127 out:
2128         tbl->current_rate =
2129             il4965_rate_n_flags_from_tbl(il, tbl, idx, is_green);
2130         i = idx;
2131         lq_sta->last_txrate_idx = i;
2132 }
2133
2134 /**
2135  * il4965_rs_initialize_lq - Initialize a station's hardware rate table
2136  *
2137  * The uCode's station table contains a table of fallback rates
2138  * for automatic fallback during transmission.
2139  *
2140  * NOTE: This sets up a default set of values.  These will be replaced later
2141  *       if the driver's iwl-4965-rs rate scaling algorithm is used, instead of
2142  *       rc80211_simple.
2143  *
2144  * NOTE: Run C_ADD_STA command to set up station table entry, before
2145  *       calling this function (which runs C_TX_LINK_QUALITY_CMD,
2146  *       which requires station table entry to exist).
2147  */
2148 static void
2149 il4965_rs_initialize_lq(struct il_priv *il, struct ieee80211_conf *conf,
2150                         struct ieee80211_sta *sta, struct il_lq_sta *lq_sta)
2151 {
2152         struct il_scale_tbl_info *tbl;
2153         int rate_idx;
2154         int i;
2155         u32 rate;
2156         u8 use_green = il4965_rs_use_green(il, sta);
2157         u8 active_tbl = 0;
2158         u8 valid_tx_ant;
2159         struct il_station_priv *sta_priv;
2160
2161         if (!sta || !lq_sta)
2162                 return;
2163
2164         sta_priv = (void *)sta->drv_priv;
2165
2166         i = lq_sta->last_txrate_idx;
2167
2168         valid_tx_ant = il->hw_params.valid_tx_ant;
2169
2170         if (!lq_sta->search_better_tbl)
2171                 active_tbl = lq_sta->active_tbl;
2172         else
2173                 active_tbl = 1 - lq_sta->active_tbl;
2174
2175         tbl = &(lq_sta->lq_info[active_tbl]);
2176
2177         if (i < 0 || i >= RATE_COUNT)
2178                 i = 0;
2179
2180         rate = il_rates[i].plcp;
2181         tbl->ant_type = il4965_first_antenna(valid_tx_ant);
2182         rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2183
2184         if (i >= IL_FIRST_CCK_RATE && i <= IL_LAST_CCK_RATE)
2185                 rate |= RATE_MCS_CCK_MSK;
2186
2187         il4965_rs_get_tbl_info_from_mcs(rate, il->band, tbl, &rate_idx);
2188         if (!il4965_rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2189                 il4965_rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2190
2191         rate = il4965_rate_n_flags_from_tbl(il, tbl, rate_idx, use_green);
2192         tbl->current_rate = rate;
2193         il4965_rs_set_expected_tpt_table(lq_sta, tbl);
2194         il4965_rs_fill_link_cmd(NULL, lq_sta, rate);
2195         il->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2196         il_send_lq_cmd(il, &lq_sta->lq, CMD_SYNC, true);
2197 }
2198
2199 static void
2200 il4965_rs_get_rate(void *il_r, struct ieee80211_sta *sta, void *il_sta,
2201                    struct ieee80211_tx_rate_control *txrc)
2202 {
2203
2204         struct sk_buff *skb = txrc->skb;
2205         struct ieee80211_supported_band *sband = txrc->sband;
2206         struct il_priv *il __maybe_unused = (struct il_priv *)il_r;
2207         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2208         struct il_lq_sta *lq_sta = il_sta;
2209         int rate_idx;
2210
2211         D_RATE("rate scale calculate new rate for skb\n");
2212
2213         /* Get max rate if user set max rate */
2214         if (lq_sta) {
2215                 lq_sta->max_rate_idx = txrc->max_rate_idx;
2216                 if (sband->band == IEEE80211_BAND_5GHZ &&
2217                     lq_sta->max_rate_idx != -1)
2218                         lq_sta->max_rate_idx += IL_FIRST_OFDM_RATE;
2219                 if (lq_sta->max_rate_idx < 0 ||
2220                     lq_sta->max_rate_idx >= RATE_COUNT)
2221                         lq_sta->max_rate_idx = -1;
2222         }
2223
2224         /* Treat uninitialized rate scaling data same as non-existing. */
2225         if (lq_sta && !lq_sta->drv) {
2226                 D_RATE("Rate scaling not initialized yet.\n");
2227                 il_sta = NULL;
2228         }
2229
2230         /* Send management frames and NO_ACK data using lowest rate. */
2231         if (rate_control_send_low(sta, il_sta, txrc))
2232                 return;
2233
2234         if (!lq_sta)
2235                 return;
2236
2237         rate_idx = lq_sta->last_txrate_idx;
2238
2239         if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2240                 rate_idx -= IL_FIRST_OFDM_RATE;
2241                 /* 6M and 9M shared same MCS idx */
2242                 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2243                 if (il4965_rs_extract_rate(lq_sta->last_rate_n_flags) >=
2244                     RATE_MIMO2_6M_PLCP)
2245                         rate_idx = rate_idx + MCS_IDX_PER_STREAM;
2246                 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2247                 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2248                         info->control.rates[0].flags |=
2249                             IEEE80211_TX_RC_SHORT_GI;
2250                 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2251                         info->control.rates[0].flags |=
2252                             IEEE80211_TX_RC_DUP_DATA;
2253                 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2254                         info->control.rates[0].flags |=
2255                             IEEE80211_TX_RC_40_MHZ_WIDTH;
2256                 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2257                         info->control.rates[0].flags |=
2258                             IEEE80211_TX_RC_GREEN_FIELD;
2259         } else {
2260                 /* Check for invalid rates */
2261                 if (rate_idx < 0 || rate_idx >= RATE_COUNT_LEGACY ||
2262                     (sband->band == IEEE80211_BAND_5GHZ &&
2263                      rate_idx < IL_FIRST_OFDM_RATE))
2264                         rate_idx = rate_lowest_index(sband, sta);
2265                 /* On valid 5 GHz rate, adjust idx */
2266                 else if (sband->band == IEEE80211_BAND_5GHZ)
2267                         rate_idx -= IL_FIRST_OFDM_RATE;
2268                 info->control.rates[0].flags = 0;
2269         }
2270         info->control.rates[0].idx = rate_idx;
2271
2272 }
2273
2274 static void *
2275 il4965_rs_alloc_sta(void *il_rate, struct ieee80211_sta *sta, gfp_t gfp)
2276 {
2277         struct il_station_priv *sta_priv =
2278             (struct il_station_priv *)sta->drv_priv;
2279         struct il_priv *il;
2280
2281         il = (struct il_priv *)il_rate;
2282         D_RATE("create station rate scale win\n");
2283
2284         return &sta_priv->lq_sta;
2285 }
2286
2287 /*
2288  * Called after adding a new station to initialize rate scaling
2289  */
2290 void
2291 il4965_rs_rate_init(struct il_priv *il, struct ieee80211_sta *sta, u8 sta_id)
2292 {
2293         int i, j;
2294         struct ieee80211_hw *hw = il->hw;
2295         struct ieee80211_conf *conf = &il->hw->conf;
2296         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2297         struct il_station_priv *sta_priv;
2298         struct il_lq_sta *lq_sta;
2299         struct ieee80211_supported_band *sband;
2300
2301         sta_priv = (struct il_station_priv *)sta->drv_priv;
2302         lq_sta = &sta_priv->lq_sta;
2303         sband = hw->wiphy->bands[conf->channel->band];
2304
2305         lq_sta->lq.sta_id = sta_id;
2306
2307         for (j = 0; j < LQ_SIZE; j++)
2308                 for (i = 0; i < RATE_COUNT; i++)
2309                         il4965_rs_rate_scale_clear_win(&lq_sta->lq_info[j].
2310                                                        win[i]);
2311
2312         lq_sta->flush_timer = 0;
2313         lq_sta->supp_rates = sta->supp_rates[sband->band];
2314         for (j = 0; j < LQ_SIZE; j++)
2315                 for (i = 0; i < RATE_COUNT; i++)
2316                         il4965_rs_rate_scale_clear_win(&lq_sta->lq_info[j].
2317                                                        win[i]);
2318
2319         D_RATE("LQ:" "*** rate scale station global init for station %d ***\n",
2320                sta_id);
2321         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2322          * the lowest or the highest rate.. Could consider using RSSI from
2323          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2324          * after assoc.. */
2325
2326         lq_sta->is_dup = 0;
2327         lq_sta->max_rate_idx = -1;
2328         lq_sta->missed_rate_counter = IL_MISSED_RATE_MAX;
2329         lq_sta->is_green = il4965_rs_use_green(il, sta);
2330         lq_sta->active_legacy_rate = il->active_rate & ~(0x1000);
2331         lq_sta->band = il->band;
2332         /*
2333          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2334          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2335          */
2336         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2337         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2338         lq_sta->active_siso_rate &= ~((u16) 0x2);
2339         lq_sta->active_siso_rate <<= IL_FIRST_OFDM_RATE;
2340
2341         /* Same here */
2342         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2343         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2344         lq_sta->active_mimo2_rate &= ~((u16) 0x2);
2345         lq_sta->active_mimo2_rate <<= IL_FIRST_OFDM_RATE;
2346
2347         /* These values will be overridden later */
2348         lq_sta->lq.general_params.single_stream_ant_msk =
2349             il4965_first_antenna(il->hw_params.valid_tx_ant);
2350         lq_sta->lq.general_params.dual_stream_ant_msk =
2351             il->hw_params.valid_tx_ant & ~il4965_first_antenna(il->hw_params.
2352                                                                valid_tx_ant);
2353         if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2354                 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2355         } else if (il4965_num_of_ant(il->hw_params.valid_tx_ant) == 2) {
2356                 lq_sta->lq.general_params.dual_stream_ant_msk =
2357                     il->hw_params.valid_tx_ant;
2358         }
2359
2360         /* as default allow aggregation for all tids */
2361         lq_sta->tx_agg_tid_en = IL_AGG_ALL_TID;
2362         lq_sta->drv = il;
2363
2364         /* Set last_txrate_idx to lowest rate */
2365         lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2366         if (sband->band == IEEE80211_BAND_5GHZ)
2367                 lq_sta->last_txrate_idx += IL_FIRST_OFDM_RATE;
2368         lq_sta->is_agg = 0;
2369
2370 #ifdef CONFIG_MAC80211_DEBUGFS
2371         lq_sta->dbg_fixed_rate = 0;
2372 #endif
2373
2374         il4965_rs_initialize_lq(il, conf, sta, lq_sta);
2375 }
2376
2377 static void
2378 il4965_rs_fill_link_cmd(struct il_priv *il, struct il_lq_sta *lq_sta,
2379                         u32 new_rate)
2380 {
2381         struct il_scale_tbl_info tbl_type;
2382         int idx = 0;
2383         int rate_idx;
2384         int repeat_rate = 0;
2385         u8 ant_toggle_cnt = 0;
2386         u8 use_ht_possible = 1;
2387         u8 valid_tx_ant = 0;
2388         struct il_link_quality_cmd *lq_cmd = &lq_sta->lq;
2389
2390         /* Override starting rate (idx 0) if needed for debug purposes */
2391         il4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, idx);
2392
2393         /* Interpret new_rate (rate_n_flags) */
2394         il4965_rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2395                                         &rate_idx);
2396
2397         /* How many times should we repeat the initial rate? */
2398         if (is_legacy(tbl_type.lq_type)) {
2399                 ant_toggle_cnt = 1;
2400                 repeat_rate = IL_NUMBER_TRY;
2401         } else {
2402                 repeat_rate = IL_HT_NUMBER_TRY;
2403         }
2404
2405         lq_cmd->general_params.mimo_delimiter =
2406             is_mimo(tbl_type.lq_type) ? 1 : 0;
2407
2408         /* Fill 1st table entry (idx 0) */
2409         lq_cmd->rs_table[idx].rate_n_flags = cpu_to_le32(new_rate);
2410
2411         if (il4965_num_of_ant(tbl_type.ant_type) == 1) {
2412                 lq_cmd->general_params.single_stream_ant_msk =
2413                     tbl_type.ant_type;
2414         } else if (il4965_num_of_ant(tbl_type.ant_type) == 2) {
2415                 lq_cmd->general_params.dual_stream_ant_msk = tbl_type.ant_type;
2416         }
2417         /* otherwise we don't modify the existing value */
2418         idx++;
2419         repeat_rate--;
2420         if (il)
2421                 valid_tx_ant = il->hw_params.valid_tx_ant;
2422
2423         /* Fill rest of rate table */
2424         while (idx < LINK_QUAL_MAX_RETRY_NUM) {
2425                 /* Repeat initial/next rate.
2426                  * For legacy IL_NUMBER_TRY == 1, this loop will not execute.
2427                  * For HT IL_HT_NUMBER_TRY == 3, this executes twice. */
2428                 while (repeat_rate > 0 && idx < LINK_QUAL_MAX_RETRY_NUM) {
2429                         if (is_legacy(tbl_type.lq_type)) {
2430                                 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2431                                         ant_toggle_cnt++;
2432                                 else if (il &&
2433                                          il4965_rs_toggle_antenna(valid_tx_ant,
2434                                                                   &new_rate,
2435                                                                   &tbl_type))
2436                                         ant_toggle_cnt = 1;
2437                         }
2438
2439                         /* Override next rate if needed for debug purposes */
2440                         il4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, idx);
2441
2442                         /* Fill next table entry */
2443                         lq_cmd->rs_table[idx].rate_n_flags =
2444                             cpu_to_le32(new_rate);
2445                         repeat_rate--;
2446                         idx++;
2447                 }
2448
2449                 il4965_rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2450                                                 &tbl_type, &rate_idx);
2451
2452                 /* Indicate to uCode which entries might be MIMO.
2453                  * If initial rate was MIMO, this will finally end up
2454                  * as (IL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2455                 if (is_mimo(tbl_type.lq_type))
2456                         lq_cmd->general_params.mimo_delimiter = idx;
2457
2458                 /* Get next rate */
2459                 new_rate =
2460                     il4965_rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2461                                              use_ht_possible);
2462
2463                 /* How many times should we repeat the next rate? */
2464                 if (is_legacy(tbl_type.lq_type)) {
2465                         if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2466                                 ant_toggle_cnt++;
2467                         else if (il &&
2468                                  il4965_rs_toggle_antenna(valid_tx_ant,
2469                                                           &new_rate, &tbl_type))
2470                                 ant_toggle_cnt = 1;
2471
2472                         repeat_rate = IL_NUMBER_TRY;
2473                 } else {
2474                         repeat_rate = IL_HT_NUMBER_TRY;
2475                 }
2476
2477                 /* Don't allow HT rates after next pass.
2478                  * il4965_rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2479                 use_ht_possible = 0;
2480
2481                 /* Override next rate if needed for debug purposes */
2482                 il4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, idx);
2483
2484                 /* Fill next table entry */
2485                 lq_cmd->rs_table[idx].rate_n_flags = cpu_to_le32(new_rate);
2486
2487                 idx++;
2488                 repeat_rate--;
2489         }
2490
2491         lq_cmd->agg_params.agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2492         lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2493
2494         lq_cmd->agg_params.agg_time_limit =
2495             cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2496 }
2497
2498 static void *
2499 il4965_rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2500 {
2501         return hw->priv;
2502 }
2503
2504 /* rate scale requires free function to be implemented */
2505 static void
2506 il4965_rs_free(void *il_rate)
2507 {
2508         return;
2509 }
2510
2511 static void
2512 il4965_rs_free_sta(void *il_r, struct ieee80211_sta *sta, void *il_sta)
2513 {
2514         struct il_priv *il __maybe_unused = il_r;
2515
2516         D_RATE("enter\n");
2517         D_RATE("leave\n");
2518 }
2519
2520 #ifdef CONFIG_MAC80211_DEBUGFS
2521 static int
2522 il4965_open_file_generic(struct inode *inode, struct file *file)
2523 {
2524         file->private_data = inode->i_private;
2525         return 0;
2526 }
2527
2528 static void
2529 il4965_rs_dbgfs_set_mcs(struct il_lq_sta *lq_sta, u32 * rate_n_flags, int idx)
2530 {
2531         struct il_priv *il;
2532         u8 valid_tx_ant;
2533         u8 ant_sel_tx;
2534
2535         il = lq_sta->drv;
2536         valid_tx_ant = il->hw_params.valid_tx_ant;
2537         if (lq_sta->dbg_fixed_rate) {
2538                 ant_sel_tx =
2539                     ((lq_sta->
2540                       dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK) >>
2541                      RATE_MCS_ANT_POS);
2542                 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
2543                         *rate_n_flags = lq_sta->dbg_fixed_rate;
2544                         D_RATE("Fixed rate ON\n");
2545                 } else {
2546                         lq_sta->dbg_fixed_rate = 0;
2547                         IL_ERR
2548                             ("Invalid antenna selection 0x%X, Valid is 0x%X\n",
2549                              ant_sel_tx, valid_tx_ant);
2550                         D_RATE("Fixed rate OFF\n");
2551                 }
2552         } else {
2553                 D_RATE("Fixed rate OFF\n");
2554         }
2555 }
2556
2557 static ssize_t
2558 il4965_rs_sta_dbgfs_scale_table_write(struct file *file,
2559                                       const char __user *user_buf,
2560                                       size_t count, loff_t *ppos)
2561 {
2562         struct il_lq_sta *lq_sta = file->private_data;
2563         struct il_priv *il;
2564         char buf[64];
2565         size_t buf_size;
2566         u32 parsed_rate;
2567
2568         il = lq_sta->drv;
2569         memset(buf, 0, sizeof(buf));
2570         buf_size = min(count, sizeof(buf) - 1);
2571         if (copy_from_user(buf, user_buf, buf_size))
2572                 return -EFAULT;
2573
2574         if (sscanf(buf, "%x", &parsed_rate) == 1)
2575                 lq_sta->dbg_fixed_rate = parsed_rate;
2576         else
2577                 lq_sta->dbg_fixed_rate = 0;
2578
2579         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
2580         lq_sta->active_siso_rate = 0x1FD0;      /* 6 - 60 MBits, no 9, no CCK */
2581         lq_sta->active_mimo2_rate = 0x1FD0;     /* 6 - 60 MBits, no 9, no CCK */
2582
2583         D_RATE("sta_id %d rate 0x%X\n", lq_sta->lq.sta_id,
2584                lq_sta->dbg_fixed_rate);
2585
2586         if (lq_sta->dbg_fixed_rate) {
2587                 il4965_rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2588                 il_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC, false);
2589         }
2590
2591         return count;
2592 }
2593
2594 static ssize_t
2595 il4965_rs_sta_dbgfs_scale_table_read(struct file *file, char __user *user_buf,
2596                                      size_t count, loff_t *ppos)
2597 {
2598         char *buff;
2599         int desc = 0;
2600         int i = 0;
2601         int idx = 0;
2602         ssize_t ret;
2603
2604         struct il_lq_sta *lq_sta = file->private_data;
2605         struct il_priv *il;
2606         struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2607
2608         il = lq_sta->drv;
2609         buff = kmalloc(1024, GFP_KERNEL);
2610         if (!buff)
2611                 return -ENOMEM;
2612
2613         desc += sprintf(buff + desc, "sta_id %d\n", lq_sta->lq.sta_id);
2614         desc +=
2615             sprintf(buff + desc, "failed=%d success=%d rate=0%X\n",
2616                     lq_sta->total_failed, lq_sta->total_success,
2617                     lq_sta->active_legacy_rate);
2618         desc +=
2619             sprintf(buff + desc, "fixed rate 0x%X\n", lq_sta->dbg_fixed_rate);
2620         desc +=
2621             sprintf(buff + desc, "valid_tx_ant %s%s%s\n",
2622                     (il->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
2623                     (il->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
2624                     (il->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
2625         desc +=
2626             sprintf(buff + desc, "lq type %s\n",
2627                     (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
2628         if (is_Ht(tbl->lq_type)) {
2629                 desc +=
2630                     sprintf(buff + desc, " %s",
2631                             (is_siso(tbl->lq_type)) ? "SISO" : "MIMO2");
2632                 desc +=
2633                     sprintf(buff + desc, " %s",
2634                             (tbl->is_ht40) ? "40MHz" : "20MHz");
2635                 desc +=
2636                     sprintf(buff + desc, " %s %s %s\n",
2637                             (tbl->is_SGI) ? "SGI" : "",
2638                             (lq_sta->is_green) ? "GF enabled" : "",
2639                             (lq_sta->is_agg) ? "AGG on" : "");
2640         }
2641         desc +=
2642             sprintf(buff + desc, "last tx rate=0x%X\n",
2643                     lq_sta->last_rate_n_flags);
2644         desc +=
2645             sprintf(buff + desc,
2646                     "general:" "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2647                     lq_sta->lq.general_params.flags,
2648                     lq_sta->lq.general_params.mimo_delimiter,
2649                     lq_sta->lq.general_params.single_stream_ant_msk,
2650                     lq_sta->lq.general_params.dual_stream_ant_msk);
2651
2652         desc +=
2653             sprintf(buff + desc,
2654                     "agg:"
2655                     "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2656                     le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2657                     lq_sta->lq.agg_params.agg_dis_start_th,
2658                     lq_sta->lq.agg_params.agg_frame_cnt_limit);
2659
2660         desc +=
2661             sprintf(buff + desc,
2662                     "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2663                     lq_sta->lq.general_params.start_rate_idx[0],
2664                     lq_sta->lq.general_params.start_rate_idx[1],
2665                     lq_sta->lq.general_params.start_rate_idx[2],
2666                     lq_sta->lq.general_params.start_rate_idx[3]);
2667
2668         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2669                 idx =
2670                     il4965_hwrate_to_plcp_idx(le32_to_cpu
2671                                               (lq_sta->lq.rs_table[i].
2672                                                rate_n_flags));
2673                 if (is_legacy(tbl->lq_type)) {
2674                         desc +=
2675                             sprintf(buff + desc, " rate[%d] 0x%X %smbps\n", i,
2676                                     le32_to_cpu(lq_sta->lq.rs_table[i].
2677                                                 rate_n_flags),
2678                                     il_rate_mcs[idx].mbps);
2679                 } else {
2680                         desc +=
2681                             sprintf(buff + desc, " rate[%d] 0x%X %smbps (%s)\n",
2682                                     i,
2683                                     le32_to_cpu(lq_sta->lq.rs_table[i].
2684                                                 rate_n_flags),
2685                                     il_rate_mcs[idx].mbps,
2686                                     il_rate_mcs[idx].mcs);
2687                 }
2688         }
2689
2690         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2691         kfree(buff);
2692         return ret;
2693 }
2694
2695 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2696         .write = il4965_rs_sta_dbgfs_scale_table_write,
2697         .read = il4965_rs_sta_dbgfs_scale_table_read,
2698         .open = il4965_open_file_generic,
2699         .llseek = default_llseek,
2700 };
2701
2702 static ssize_t
2703 il4965_rs_sta_dbgfs_stats_table_read(struct file *file, char __user *user_buf,
2704                                      size_t count, loff_t *ppos)
2705 {
2706         char *buff;
2707         int desc = 0;
2708         int i, j;
2709         ssize_t ret;
2710
2711         struct il_lq_sta *lq_sta = file->private_data;
2712
2713         buff = kmalloc(1024, GFP_KERNEL);
2714         if (!buff)
2715                 return -ENOMEM;
2716
2717         for (i = 0; i < LQ_SIZE; i++) {
2718                 desc +=
2719                     sprintf(buff + desc,
2720                             "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
2721                             "rate=0x%X\n", lq_sta->active_tbl == i ? "*" : "x",
2722                             lq_sta->lq_info[i].lq_type,
2723                             lq_sta->lq_info[i].is_SGI,
2724                             lq_sta->lq_info[i].is_ht40,
2725                             lq_sta->lq_info[i].is_dup, lq_sta->is_green,
2726                             lq_sta->lq_info[i].current_rate);
2727                 for (j = 0; j < RATE_COUNT; j++) {
2728                         desc +=
2729                             sprintf(buff + desc,
2730                                     "counter=%d success=%d %%=%d\n",
2731                                     lq_sta->lq_info[i].win[j].counter,
2732                                     lq_sta->lq_info[i].win[j].success_counter,
2733                                     lq_sta->lq_info[i].win[j].success_ratio);
2734                 }
2735         }
2736         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2737         kfree(buff);
2738         return ret;
2739 }
2740
2741 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2742         .read = il4965_rs_sta_dbgfs_stats_table_read,
2743         .open = il4965_open_file_generic,
2744         .llseek = default_llseek,
2745 };
2746
2747 static ssize_t
2748 il4965_rs_sta_dbgfs_rate_scale_data_read(struct file *file,
2749                                          char __user *user_buf, size_t count,
2750                                          loff_t *ppos)
2751 {
2752         char buff[120];
2753         int desc = 0;
2754         struct il_lq_sta *lq_sta = file->private_data;
2755         struct il_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
2756
2757         if (is_Ht(tbl->lq_type))
2758                 desc +=
2759                     sprintf(buff + desc, "Bit Rate= %d Mb/s\n",
2760                             tbl->expected_tpt[lq_sta->last_txrate_idx]);
2761         else
2762                 desc +=
2763                     sprintf(buff + desc, "Bit Rate= %d Mb/s\n",
2764                             il_rates[lq_sta->last_txrate_idx].ieee >> 1);
2765
2766         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2767 }
2768
2769 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
2770         .read = il4965_rs_sta_dbgfs_rate_scale_data_read,
2771         .open = il4965_open_file_generic,
2772         .llseek = default_llseek,
2773 };
2774
2775 static void
2776 il4965_rs_add_debugfs(void *il, void *il_sta, struct dentry *dir)
2777 {
2778         struct il_lq_sta *lq_sta = il_sta;
2779         lq_sta->rs_sta_dbgfs_scale_table_file =
2780             debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
2781                                 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2782         lq_sta->rs_sta_dbgfs_stats_table_file =
2783             debugfs_create_file("rate_stats_table", S_IRUSR, dir, lq_sta,
2784                                 &rs_sta_dbgfs_stats_table_ops);
2785         lq_sta->rs_sta_dbgfs_rate_scale_data_file =
2786             debugfs_create_file("rate_scale_data", S_IRUSR, dir, lq_sta,
2787                                 &rs_sta_dbgfs_rate_scale_data_ops);
2788         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2789             debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
2790                               &lq_sta->tx_agg_tid_en);
2791
2792 }
2793
2794 static void
2795 il4965_rs_remove_debugfs(void *il, void *il_sta)
2796 {
2797         struct il_lq_sta *lq_sta = il_sta;
2798         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2799         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2800         debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
2801         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2802 }
2803 #endif
2804
2805 /*
2806  * Initialization of rate scaling information is done by driver after
2807  * the station is added. Since mac80211 calls this function before a
2808  * station is added we ignore it.
2809  */
2810 static void
2811 il4965_rs_rate_init_stub(void *il_r, struct ieee80211_supported_band *sband,
2812                          struct ieee80211_sta *sta, void *il_sta)
2813 {
2814 }
2815
2816 static struct rate_control_ops rs_4965_ops = {
2817         .module = NULL,
2818         .name = IL4965_RS_NAME,
2819         .tx_status = il4965_rs_tx_status,
2820         .get_rate = il4965_rs_get_rate,
2821         .rate_init = il4965_rs_rate_init_stub,
2822         .alloc = il4965_rs_alloc,
2823         .free = il4965_rs_free,
2824         .alloc_sta = il4965_rs_alloc_sta,
2825         .free_sta = il4965_rs_free_sta,
2826 #ifdef CONFIG_MAC80211_DEBUGFS
2827         .add_sta_debugfs = il4965_rs_add_debugfs,
2828         .remove_sta_debugfs = il4965_rs_remove_debugfs,
2829 #endif
2830 };
2831
2832 int
2833 il4965_rate_control_register(void)
2834 {
2835         return ieee80211_rate_control_register(&rs_4965_ops);
2836 }
2837
2838 void
2839 il4965_rate_control_unregister(void)
2840 {
2841         ieee80211_rate_control_unregister(&rs_4965_ops);
2842 }