drivers/net/wireless/iwlwifi/iwl-agn-rs.c

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