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