Pileus Git - ~andy/linux/blob - drivers/net/wireless/iwlwifi/dvm/rs.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2014 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/skbuff.h>
  28 #include <linux/slab.h>
  29 #include <net/mac80211.h>
  30
  31 #include <linux/netdevice.h>
  32 #include <linux/etherdevice.h>
  33 #include <linux/delay.h>
  34
  35 #include <linux/workqueue.h>
  36
  37 #include "dev.h"
  38 #include "agn.h"
  39
  40 #define RS_NAME "iwl-agn-rs"
  41
  42 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
  43 #define IWL_NUMBER_TRY      1
  44 #define IWL_HT_NUMBER_TRY   3
  45
  46 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  47 #define IWL_RATE_MIN_FAILURE_TH         6       /* min failures to calc tpt */
  48 #define IWL_RATE_MIN_SUCCESS_TH         8       /* min successes to calc tpt */
  49
  50 /* max allowed rate miss before sync LQ cmd */
  51 #define IWL_MISSED_RATE_MAX             15
  52 /* max time to accum history 2 seconds */
  53 #define IWL_RATE_SCALE_FLUSH_INTVL   (3*HZ)
  54
  55 static u8 rs_ht_to_legacy[] = {
  56         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  57         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  58         IWL_RATE_6M_INDEX,
  59         IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
  60         IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
  61         IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
  62         IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
  63 };
  64
  65 static const u8 ant_toggle_lookup[] = {
  66         /*ANT_NONE -> */ ANT_NONE,
  67         /*ANT_A    -> */ ANT_B,
  68         /*ANT_B    -> */ ANT_C,
  69         /*ANT_AB   -> */ ANT_BC,
  70         /*ANT_C    -> */ ANT_A,
  71         /*ANT_AC   -> */ ANT_AB,
  72         /*ANT_BC   -> */ ANT_AC,
  73         /*ANT_ABC  -> */ ANT_ABC,
  74 };
  75
  76 #define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np)    \
  77         [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,      \
  78                                     IWL_RATE_SISO_##s##M_PLCP, \
  79                                     IWL_RATE_MIMO2_##s##M_PLCP,\
  80                                     IWL_RATE_MIMO3_##s##M_PLCP,\
  81                                     IWL_RATE_##r##M_IEEE,      \
  82                                     IWL_RATE_##ip##M_INDEX,    \
  83                                     IWL_RATE_##in##M_INDEX,    \
  84                                     IWL_RATE_##rp##M_INDEX,    \
  85                                     IWL_RATE_##rn##M_INDEX,    \
  86                                     IWL_RATE_##pp##M_INDEX,    \
  87                                     IWL_RATE_##np##M_INDEX }
  88
  89 /*
  90  * Parameter order:
  91  *   rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
  92  *
  93  * If there isn't a valid next or previous rate then INV is used which
  94  * maps to IWL_RATE_INVALID
  95  *
  96  */
  97 const struct iwl_rate_info iwl_rates[IWL_RATE_COUNT] = {
  98         IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2),    /*  1mbps */
  99         IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5),          /*  2mbps */
 100         IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11),        /*5.5mbps */
 101         IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18),      /* 11mbps */
 102         IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11),        /*  6mbps */
 103         IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11),       /*  9mbps */
 104         IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18),   /* 12mbps */
 105         IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24),   /* 18mbps */
 106         IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36),   /* 24mbps */
 107         IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48),   /* 36mbps */
 108         IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54),   /* 48mbps */
 109         IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
 110         IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
 111         /* FIXME:RS:          ^^    should be INV (legacy) */
 112 };
 113
 114 static inline u8 rs_extract_rate(u32 rate_n_flags)
 115 {
 116         return (u8)(rate_n_flags & RATE_MCS_RATE_MSK);
 117 }
 118
 119 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
 120 {
 121         int idx = 0;
 122
 123         /* HT rate format */
 124         if (rate_n_flags & RATE_MCS_HT_MSK) {
 125                 idx = rs_extract_rate(rate_n_flags);
 126
 127                 if (idx >= IWL_RATE_MIMO3_6M_PLCP)
 128                         idx = idx - IWL_RATE_MIMO3_6M_PLCP;
 129                 else if (idx >= IWL_RATE_MIMO2_6M_PLCP)
 130                         idx = idx - IWL_RATE_MIMO2_6M_PLCP;
 131
 132                 idx += IWL_FIRST_OFDM_RATE;
 133                 /* skip 9M not supported in ht*/
 134                 if (idx >= IWL_RATE_9M_INDEX)
 135                         idx += 1;
 136                 if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE))
 137                         return idx;
 138
 139         /* legacy rate format, search for match in table */
 140         } else {
 141                 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
 142                         if (iwl_rates[idx].plcp ==
 143                                         rs_extract_rate(rate_n_flags))
 144                                 return idx;
 145         }
 146
 147         return -1;
 148 }
 149
 150 static void rs_rate_scale_perform(struct iwl_priv *priv,
 151                                    struct sk_buff *skb,
 152                                    struct ieee80211_sta *sta,
 153                                    struct iwl_lq_sta *lq_sta);
 154 static void rs_fill_link_cmd(struct iwl_priv *priv,
 155                              struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
 156 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
 157
 158
 159 #ifdef CONFIG_MAC80211_DEBUGFS
 160 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 161                              u32 *rate_n_flags, int index);
 162 #else
 163 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 164                              u32 *rate_n_flags, int index)
 165 {}
 166 #endif
 167
 168 /**
 169  * The following tables contain the expected throughput metrics for all rates
 170  *
 171  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 172  *
 173  * where invalid entries are zeros.
 174  *
 175  * CCK rates are only valid in legacy table and will only be used in G
 176  * (2.4 GHz) band.
 177  */
 178
 179 static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
 180         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
 181 };
 182
 183 static s32 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
 184         {0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202}, /* Norm */
 185         {0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210}, /* SGI */
 186         {0, 0, 0, 0, 47, 0,  91, 133, 171, 242, 305, 334, 362}, /* AGG */
 187         {0, 0, 0, 0, 52, 0, 101, 145, 187, 264, 330, 361, 390}, /* AGG+SGI */
 188 };
 189
 190 static s32 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
 191         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
 192         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
 193         {0, 0, 0, 0,  94, 0, 177, 249, 313, 423, 512, 550, 586}, /* AGG */
 194         {0, 0, 0, 0, 104, 0, 193, 270, 338, 454, 545, 584, 620}, /* AGG+SGI */
 195 };
 196
 197 static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 198         {0, 0, 0, 0,  74, 0, 123, 155, 179, 214, 236, 244, 251}, /* Norm */
 199         {0, 0, 0, 0,  81, 0, 131, 164, 188, 223, 243, 251, 257}, /* SGI */
 200         {0, 0, 0, 0,  89, 0, 167, 235, 296, 402, 488, 526, 560}, /* AGG */
 201         {0, 0, 0, 0,  97, 0, 182, 255, 320, 431, 520, 558, 593}, /* AGG+SGI*/
 202 };
 203
 204 static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 205         {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
 206         {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
 207         {0, 0, 0, 0, 171, 0, 305, 410, 496, 634, 731, 771, 805}, /* AGG */
 208         {0, 0, 0, 0, 186, 0, 329, 439, 527, 667, 764, 803, 838}, /* AGG+SGI */
 209 };
 210
 211 static s32 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = {
 212         {0, 0, 0, 0,  99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */
 213         {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */
 214         {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */
 215         {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */
 216 };
 217
 218 static s32 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = {
 219         {0, 0, 0, 0, 152, 0, 211, 239, 255, 279,  290,  294,  297}, /* Norm */
 220         {0, 0, 0, 0, 160, 0, 219, 245, 261, 284,  294,  297,  300}, /* SGI */
 221         {0, 0, 0, 0, 254, 0, 443, 584, 695, 868,  984, 1030, 1070}, /* AGG */
 222         {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */
 223 };
 224
 225 /* mbps, mcs */
 226 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 227         {  "1", "BPSK DSSS"},
 228         {  "2", "QPSK DSSS"},
 229         {"5.5", "BPSK CCK"},
 230         { "11", "QPSK CCK"},
 231         {  "6", "BPSK 1/2"},
 232         {  "9", "BPSK 1/2"},
 233         { "12", "QPSK 1/2"},
 234         { "18", "QPSK 3/4"},
 235         { "24", "16QAM 1/2"},
 236         { "36", "16QAM 3/4"},
 237         { "48", "64QAM 2/3"},
 238         { "54", "64QAM 3/4"},
 239         { "60", "64QAM 5/6"},
 240 };
 241
 242 #define MCS_INDEX_PER_STREAM    (8)
 243
 244 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 245 {
 246         window->data = 0;
 247         window->success_counter = 0;
 248         window->success_ratio = IWL_INVALID_VALUE;
 249         window->counter = 0;
 250         window->average_tpt = IWL_INVALID_VALUE;
 251         window->stamp = 0;
 252 }
 253
 254 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 255 {
 256         return (ant_type & valid_antenna) == ant_type;
 257 }
 258
 259 /*
 260  *      removes the old data from the statistics. All data that is older than
 261  *      TID_MAX_TIME_DIFF, will be deleted.
 262  */
 263 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
 264 {
 265         /* The oldest age we want to keep */
 266         u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
 267
 268         while (tl->queue_count &&
 269                (tl->time_stamp < oldest_time)) {
 270                 tl->total -= tl->packet_count[tl->head];
 271                 tl->packet_count[tl->head] = 0;
 272                 tl->time_stamp += TID_QUEUE_CELL_SPACING;
 273                 tl->queue_count--;
 274                 tl->head++;
 275                 if (tl->head >= TID_QUEUE_MAX_SIZE)
 276                         tl->head = 0;
 277         }
 278 }
 279
 280 /*
 281  *      increment traffic load value for tid and also remove
 282  *      any old values if passed the certain time period
 283  */
 284 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
 285                            struct ieee80211_hdr *hdr)
 286 {
 287         u32 curr_time = jiffies_to_msecs(jiffies);
 288         u32 time_diff;
 289         s32 index;
 290         struct iwl_traffic_load *tl = NULL;
 291         u8 tid;
 292
 293         if (ieee80211_is_data_qos(hdr->frame_control)) {
 294                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 295                 tid = qc[0] & 0xf;
 296         } else
 297                 return IWL_MAX_TID_COUNT;
 298
 299         if (unlikely(tid >= IWL_MAX_TID_COUNT))
 300                 return IWL_MAX_TID_COUNT;
 301
 302         tl = &lq_data->load[tid];
 303
 304         curr_time -= curr_time % TID_ROUND_VALUE;
 305
 306         /* Happens only for the first packet. Initialize the data */
 307         if (!(tl->queue_count)) {
 308                 tl->total = 1;
 309                 tl->time_stamp = curr_time;
 310                 tl->queue_count = 1;
 311                 tl->head = 0;
 312                 tl->packet_count[0] = 1;
 313                 return IWL_MAX_TID_COUNT;
 314         }
 315
 316         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 317         index = time_diff / TID_QUEUE_CELL_SPACING;
 318
 319         /* The history is too long: remove data that is older than */
 320         /* TID_MAX_TIME_DIFF */
 321         if (index >= TID_QUEUE_MAX_SIZE)
 322                 rs_tl_rm_old_stats(tl, curr_time);
 323
 324         index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
 325         tl->packet_count[index] = tl->packet_count[index] + 1;
 326         tl->total = tl->total + 1;
 327
 328         if ((index + 1) > tl->queue_count)
 329                 tl->queue_count = index + 1;
 330
 331         return tid;
 332 }
 333
 334 #ifdef CONFIG_MAC80211_DEBUGFS
 335 /**
 336  * Program the device to use fixed rate for frame transmit
 337  * This is for debugging/testing only
 338  * once the device start use fixed rate, we need to reload the module
 339  * to being back the normal operation.
 340  */
 341 static void rs_program_fix_rate(struct iwl_priv *priv,
 342                                 struct iwl_lq_sta *lq_sta)
 343 {
 344         struct iwl_station_priv *sta_priv =
 345                 container_of(lq_sta, struct iwl_station_priv, lq_sta);
 346         struct iwl_rxon_context *ctx = sta_priv->ctx;
 347
 348         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
 349         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 350         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 351         lq_sta->active_mimo3_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 352
 353         IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
 354                 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
 355
 356         if (lq_sta->dbg_fixed_rate) {
 357                 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
 358                 iwl_send_lq_cmd(lq_sta->drv, ctx, &lq_sta->lq, CMD_ASYNC,
 359                                 false);
 360         }
 361 }
 362 #endif
 363
 364 /*
 365         get the traffic load value for tid
 366 */
 367 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
 368 {
 369         u32 curr_time = jiffies_to_msecs(jiffies);
 370         u32 time_diff;
 371         s32 index;
 372         struct iwl_traffic_load *tl = NULL;
 373
 374         if (tid >= IWL_MAX_TID_COUNT)
 375                 return 0;
 376
 377         tl = &(lq_data->load[tid]);
 378
 379         curr_time -= curr_time % TID_ROUND_VALUE;
 380
 381         if (!(tl->queue_count))
 382                 return 0;
 383
 384         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 385         index = time_diff / TID_QUEUE_CELL_SPACING;
 386
 387         /* The history is too long: remove data that is older than */
 388         /* TID_MAX_TIME_DIFF */
 389         if (index >= TID_QUEUE_MAX_SIZE)
 390                 rs_tl_rm_old_stats(tl, curr_time);
 391
 392         return tl->total;
 393 }
 394
 395 static int rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
 396                                       struct iwl_lq_sta *lq_data, u8 tid,
 397                                       struct ieee80211_sta *sta)
 398 {
 399         int ret = -EAGAIN;
 400         u32 load;
 401
 402         /*
 403          * Don't create TX aggregation sessions when in high
 404          * BT traffic, as they would just be disrupted by BT.
 405          */
 406         if (priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) {
 407                 IWL_DEBUG_COEX(priv,
 408                                "BT traffic (%d), no aggregation allowed\n",
 409                                priv->bt_traffic_load);
 410                 return ret;
 411         }
 412
 413         load = rs_tl_get_load(lq_data, tid);
 414
 415         IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
 416                         sta->addr, tid);
 417         ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
 418         if (ret == -EAGAIN) {
 419                 /*
 420                  * driver and mac80211 is out of sync
 421                  * this might be cause by reloading firmware
 422                  * stop the tx ba session here
 423                  */
 424                 IWL_ERR(priv, "Fail start Tx agg on tid: %d\n",
 425                         tid);
 426                 ieee80211_stop_tx_ba_session(sta, tid);
 427         }
 428         return ret;
 429 }
 430
 431 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
 432                               struct iwl_lq_sta *lq_data,
 433                               struct ieee80211_sta *sta)
 434 {
 435         if (tid < IWL_MAX_TID_COUNT)
 436                 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 437         else
 438                 IWL_ERR(priv, "tid exceeds max TID count: %d/%d\n",
 439                         tid, IWL_MAX_TID_COUNT);
 440 }
 441
 442 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 443 {
 444         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 445                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 446                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 447 }
 448
 449 /*
 450  * Static function to get the expected throughput from an iwl_scale_tbl_info
 451  * that wraps a NULL pointer check
 452  */
 453 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 454 {
 455         if (tbl->expected_tpt)
 456                 return tbl->expected_tpt[rs_index];
 457         return 0;
 458 }
 459
 460 /**
 461  * rs_collect_tx_data - Update the success/failure sliding window
 462  *
 463  * We keep a sliding window of the last 62 packets transmitted
 464  * at this rate.  window->data contains the bitmask of successful
 465  * packets.
 466  */
 467 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
 468                               int scale_index, int attempts, int successes)
 469 {
 470         struct iwl_rate_scale_data *window = NULL;
 471         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 472         s32 fail_count, tpt;
 473
 474         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 475                 return -EINVAL;
 476
 477         /* Select window for current tx bit rate */
 478         window = &(tbl->win[scale_index]);
 479
 480         /* Get expected throughput */
 481         tpt = get_expected_tpt(tbl, scale_index);
 482
 483         /*
 484          * Keep track of only the latest 62 tx frame attempts in this rate's
 485          * history window; anything older isn't really relevant any more.
 486          * If we have filled up the sliding window, drop the oldest attempt;
 487          * if the oldest attempt (highest bit in bitmap) shows "success",
 488          * subtract "1" from the success counter (this is the main reason
 489          * we keep these bitmaps!).
 490          */
 491         while (attempts > 0) {
 492                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 493
 494                         /* remove earliest */
 495                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 496
 497                         if (window->data & mask) {
 498                                 window->data &= ~mask;
 499                                 window->success_counter--;
 500                         }
 501                 }
 502
 503                 /* Increment frames-attempted counter */
 504                 window->counter++;
 505
 506                 /* Shift bitmap by one frame to throw away oldest history */
 507                 window->data <<= 1;
 508
 509                 /* Mark the most recent #successes attempts as successful */
 510                 if (successes > 0) {
 511                         window->success_counter++;
 512                         window->data |= 0x1;
 513                         successes--;
 514                 }
 515
 516                 attempts--;
 517         }
 518
 519         /* Calculate current success ratio, avoid divide-by-0! */
 520         if (window->counter > 0)
 521                 window->success_ratio = 128 * (100 * window->success_counter)
 522                                         / window->counter;
 523         else
 524                 window->success_ratio = IWL_INVALID_VALUE;
 525
 526         fail_count = window->counter - window->success_counter;
 527
 528         /* Calculate average throughput, if we have enough history. */
 529         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 530             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 531                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 532         else
 533                 window->average_tpt = IWL_INVALID_VALUE;
 534
 535         /* Tag this window as having been updated */
 536         window->stamp = jiffies;
 537
 538         return 0;
 539 }
 540
 541 /*
 542  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
 543  */
 544 /* FIXME:RS:remove this function and put the flags statically in the table */
 545 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
 546                                  struct iwl_scale_tbl_info *tbl,
 547                                  int index, u8 use_green)
 548 {
 549         u32 rate_n_flags = 0;
 550
 551         if (is_legacy(tbl->lq_type)) {
 552                 rate_n_flags = iwl_rates[index].plcp;
 553                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 554                         rate_n_flags |= RATE_MCS_CCK_MSK;
 555
 556         } else if (is_Ht(tbl->lq_type)) {
 557                 if (index > IWL_LAST_OFDM_RATE) {
 558                         IWL_ERR(priv, "Invalid HT rate index %d\n", index);
 559                         index = IWL_LAST_OFDM_RATE;
 560                 }
 561                 rate_n_flags = RATE_MCS_HT_MSK;
 562
 563                 if (is_siso(tbl->lq_type))
 564                         rate_n_flags |= iwl_rates[index].plcp_siso;
 565                 else if (is_mimo2(tbl->lq_type))
 566                         rate_n_flags |= iwl_rates[index].plcp_mimo2;
 567                 else
 568                         rate_n_flags |= iwl_rates[index].plcp_mimo3;
 569         } else {
 570                 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
 571         }
 572
 573         rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
 574                                                      RATE_MCS_ANT_ABC_MSK);
 575
 576         if (is_Ht(tbl->lq_type)) {
 577                 if (tbl->is_ht40) {
 578                         if (tbl->is_dup)
 579                                 rate_n_flags |= RATE_MCS_DUP_MSK;
 580                         else
 581                                 rate_n_flags |= RATE_MCS_HT40_MSK;
 582                 }
 583                 if (tbl->is_SGI)
 584                         rate_n_flags |= RATE_MCS_SGI_MSK;
 585
 586                 if (use_green) {
 587                         rate_n_flags |= RATE_MCS_GF_MSK;
 588                         if (is_siso(tbl->lq_type) && tbl->is_SGI) {
 589                                 rate_n_flags &= ~RATE_MCS_SGI_MSK;
 590                                 IWL_ERR(priv, "GF was set with SGI:SISO\n");
 591                         }
 592                 }
 593         }
 594         return rate_n_flags;
 595 }
 596
 597 /*
 598  * Interpret uCode API's rate_n_flags format,
 599  * fill "search" or "active" tx mode table.
 600  */
 601 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
 602                                     enum ieee80211_band band,
 603                                     struct iwl_scale_tbl_info *tbl,
 604                                     int *rate_idx)
 605 {
 606         u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
 607         u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
 608         u8 mcs;
 609
 610         memset(tbl, 0, sizeof(struct iwl_scale_tbl_info));
 611         *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
 612
 613         if (*rate_idx  == IWL_RATE_INVALID) {
 614                 *rate_idx = -1;
 615                 return -EINVAL;
 616         }
 617         tbl->is_SGI = 0;        /* default legacy setup */
 618         tbl->is_ht40 = 0;
 619         tbl->is_dup = 0;
 620         tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
 621         tbl->lq_type = LQ_NONE;
 622         tbl->max_search = IWL_MAX_SEARCH;
 623
 624         /* legacy rate format */
 625         if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
 626                 if (num_of_ant == 1) {
 627                         if (band == IEEE80211_BAND_5GHZ)
 628                                 tbl->lq_type = LQ_A;
 629                         else
 630                                 tbl->lq_type = LQ_G;
 631                 }
 632         /* HT rate format */
 633         } else {
 634                 if (rate_n_flags & RATE_MCS_SGI_MSK)
 635                         tbl->is_SGI = 1;
 636
 637                 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
 638                     (rate_n_flags & RATE_MCS_DUP_MSK))
 639                         tbl->is_ht40 = 1;
 640
 641                 if (rate_n_flags & RATE_MCS_DUP_MSK)
 642                         tbl->is_dup = 1;
 643
 644                 mcs = rs_extract_rate(rate_n_flags);
 645
 646                 /* SISO */
 647                 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
 648                         if (num_of_ant == 1)
 649                                 tbl->lq_type = LQ_SISO; /*else NONE*/
 650                 /* MIMO2 */
 651                 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
 652                         if (num_of_ant == 2)
 653                                 tbl->lq_type = LQ_MIMO2;
 654                 /* MIMO3 */
 655                 } else {
 656                         if (num_of_ant == 3) {
 657                                 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
 658                                 tbl->lq_type = LQ_MIMO3;
 659                         }
 660                 }
 661         }
 662         return 0;
 663 }
 664
 665 /* switch to another antenna/antennas and return 1 */
 666 /* if no other valid antenna found, return 0 */
 667 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
 668                              struct iwl_scale_tbl_info *tbl)
 669 {
 670         u8 new_ant_type;
 671
 672         if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
 673                 return 0;
 674
 675         if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
 676                 return 0;
 677
 678         new_ant_type = ant_toggle_lookup[tbl->ant_type];
 679
 680         while ((new_ant_type != tbl->ant_type) &&
 681                !rs_is_valid_ant(valid_ant, new_ant_type))
 682                 new_ant_type = ant_toggle_lookup[new_ant_type];
 683
 684         if (new_ant_type == tbl->ant_type)
 685                 return 0;
 686
 687         tbl->ant_type = new_ant_type;
 688         *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
 689         *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
 690         return 1;
 691 }
 692
 693 /**
 694  * Green-field mode is valid if the station supports it and
 695  * there are no non-GF stations present in the BSS.
 696  */
 697 static bool rs_use_green(struct ieee80211_sta *sta)
 698 {
 699         /*
 700          * There's a bug somewhere in this code that causes the
 701          * scaling to get stuck because GF+SGI can't be combined
 702          * in SISO rates. Until we find that bug, disable GF, it
 703          * has only limited benefit and we still interoperate with
 704          * GF APs since we can always receive GF transmissions.
 705          */
 706         return false;
 707 }
 708
 709 /**
 710  * rs_get_supported_rates - get the available rates
 711  *
 712  * if management frame or broadcast frame only return
 713  * basic available rates.
 714  *
 715  */
 716 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 717                                   struct ieee80211_hdr *hdr,
 718                                   enum iwl_table_type rate_type)
 719 {
 720         if (is_legacy(rate_type)) {
 721                 return lq_sta->active_legacy_rate;
 722         } else {
 723                 if (is_siso(rate_type))
 724                         return lq_sta->active_siso_rate;
 725                 else if (is_mimo2(rate_type))
 726                         return lq_sta->active_mimo2_rate;
 727                 else
 728                         return lq_sta->active_mimo3_rate;
 729         }
 730 }
 731
 732 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
 733                                 int rate_type)
 734 {
 735         u8 high = IWL_RATE_INVALID;
 736         u8 low = IWL_RATE_INVALID;
 737
 738         /* 802.11A or ht walks to the next literal adjacent rate in
 739          * the rate table */
 740         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 741                 int i;
 742                 u32 mask;
 743
 744                 /* Find the previous rate that is in the rate mask */
 745                 i = index - 1;
 746                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 747                         if (rate_mask & mask) {
 748                                 low = i;
 749                                 break;
 750                         }
 751                 }
 752
 753                 /* Find the next rate that is in the rate mask */
 754                 i = index + 1;
 755                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 756                         if (rate_mask & mask) {
 757                                 high = i;
 758                                 break;
 759                         }
 760                 }
 761
 762                 return (high << 8) | low;
 763         }
 764
 765         low = index;
 766         while (low != IWL_RATE_INVALID) {
 767                 low = iwl_rates[low].prev_rs;
 768                 if (low == IWL_RATE_INVALID)
 769                         break;
 770                 if (rate_mask & (1 << low))
 771                         break;
 772                 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
 773         }
 774
 775         high = index;
 776         while (high != IWL_RATE_INVALID) {
 777                 high = iwl_rates[high].next_rs;
 778                 if (high == IWL_RATE_INVALID)
 779                         break;
 780                 if (rate_mask & (1 << high))
 781                         break;
 782                 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
 783         }
 784
 785         return (high << 8) | low;
 786 }
 787
 788 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
 789                              struct iwl_scale_tbl_info *tbl,
 790                              u8 scale_index, u8 ht_possible)
 791 {
 792         s32 low;
 793         u16 rate_mask;
 794         u16 high_low;
 795         u8 switch_to_legacy = 0;
 796         u8 is_green = lq_sta->is_green;
 797         struct iwl_priv *priv = lq_sta->drv;
 798
 799         /* check if we need to switch from HT to legacy rates.
 800          * assumption is that mandatory rates (1Mbps or 6Mbps)
 801          * are always supported (spec demand) */
 802         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
 803                 switch_to_legacy = 1;
 804                 scale_index = rs_ht_to_legacy[scale_index];
 805                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 806                         tbl->lq_type = LQ_A;
 807                 else
 808                         tbl->lq_type = LQ_G;
 809
 810                 if (num_of_ant(tbl->ant_type) > 1)
 811                         tbl->ant_type =
 812                             first_antenna(priv->nvm_data->valid_tx_ant);
 813
 814                 tbl->is_ht40 = 0;
 815                 tbl->is_SGI = 0;
 816                 tbl->max_search = IWL_MAX_SEARCH;
 817         }
 818
 819         rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
 820
 821         /* Mask with station rate restriction */
 822         if (is_legacy(tbl->lq_type)) {
 823                 /* supp_rates has no CCK bits in A mode */
 824                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 825                         rate_mask  = (u16)(rate_mask &
 826                            (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
 827                 else
 828                         rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
 829         }
 830
 831         /* If we switched from HT to legacy, check current rate */
 832         if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
 833                 low = scale_index;
 834                 goto out;
 835         }
 836
 837         high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
 838                                         tbl->lq_type);
 839         low = high_low & 0xff;
 840
 841         if (low == IWL_RATE_INVALID)
 842                 low = scale_index;
 843
 844 out:
 845         return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
 846 }
 847
 848 /*
 849  * Simple function to compare two rate scale table types
 850  */
 851 static bool table_type_matches(struct iwl_scale_tbl_info *a,
 852                                struct iwl_scale_tbl_info *b)
 853 {
 854         return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
 855                 (a->is_SGI == b->is_SGI);
 856 }
 857
 858 static void rs_bt_update_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 859                             struct iwl_lq_sta *lq_sta)
 860 {
 861         struct iwl_scale_tbl_info *tbl;
 862         bool full_concurrent = priv->bt_full_concurrent;
 863
 864         if (priv->bt_ant_couple_ok) {
 865                 /*
 866                  * Is there a need to switch between
 867                  * full concurrency and 3-wire?
 868                  */
 869                 if (priv->bt_ci_compliance && priv->bt_ant_couple_ok)
 870                         full_concurrent = true;
 871                 else
 872                         full_concurrent = false;
 873         }
 874         if ((priv->bt_traffic_load != priv->last_bt_traffic_load) ||
 875             (priv->bt_full_concurrent != full_concurrent)) {
 876                 priv->bt_full_concurrent = full_concurrent;
 877                 priv->last_bt_traffic_load = priv->bt_traffic_load;
 878
 879                 /* Update uCode's rate table. */
 880                 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 881                 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
 882                 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
 883
 884                 queue_work(priv->workqueue, &priv->bt_full_concurrency);
 885         }
 886 }
 887
 888 /*
 889  * mac80211 sends us Tx status
 890  */
 891 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
 892                          struct ieee80211_sta *sta, void *priv_sta,
 893                          struct sk_buff *skb)
 894 {
 895         int legacy_success;
 896         int retries;
 897         int rs_index, mac_index, i;
 898         struct iwl_lq_sta *lq_sta = priv_sta;
 899         struct iwl_link_quality_cmd *table;
 900         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 901         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)priv_r;
 902         struct iwl_priv *priv = IWL_OP_MODE_GET_DVM(op_mode);
 903         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 904         enum mac80211_rate_control_flags mac_flags;
 905         u32 tx_rate;
 906         struct iwl_scale_tbl_info tbl_type;
 907         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
 908         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
 909         struct iwl_rxon_context *ctx = sta_priv->ctx;
 910
 911         IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
 912
 913         /* Treat uninitialized rate scaling data same as non-existing. */
 914         if (!lq_sta) {
 915                 IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n");
 916                 return;
 917         } else if (!lq_sta->drv) {
 918                 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
 919                 return;
 920         }
 921
 922         if (!ieee80211_is_data(hdr->frame_control) ||
 923             info->flags & IEEE80211_TX_CTL_NO_ACK)
 924                 return;
 925
 926         /* This packet was aggregated but doesn't carry status info */
 927         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 928             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 929                 return;
 930
 931         /*
 932          * Ignore this Tx frame response if its initial rate doesn't match
 933          * that of latest Link Quality command.  There may be stragglers
 934          * from a previous Link Quality command, but we're no longer interested
 935          * in those; they're either from the "active" mode while we're trying
 936          * to check "search" mode, or a prior "search" mode after we've moved
 937          * to a new "search" mode (which might become the new "active" mode).
 938          */
 939         table = &lq_sta->lq;
 940         tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
 941         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
 942         if (priv->band == IEEE80211_BAND_5GHZ)
 943                 rs_index -= IWL_FIRST_OFDM_RATE;
 944         mac_flags = info->status.rates[0].flags;
 945         mac_index = info->status.rates[0].idx;
 946         /* For HT packets, map MCS to PLCP */
 947         if (mac_flags & IEEE80211_TX_RC_MCS) {
 948                 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
 949                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
 950                         mac_index++;
 951                 /*
 952                  * mac80211 HT index is always zero-indexed; we need to move
 953                  * HT OFDM rates after CCK rates in 2.4 GHz band
 954                  */
 955                 if (priv->band == IEEE80211_BAND_2GHZ)
 956                         mac_index += IWL_FIRST_OFDM_RATE;
 957         }
 958         /* Here we actually compare this rate to the latest LQ command */
 959         if ((mac_index < 0) ||
 960             (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
 961             (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
 962             (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
 963             (tbl_type.ant_type != info->status.antenna) ||
 964             (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
 965             (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
 966             (rs_index != mac_index)) {
 967                 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate);
 968                 /*
 969                  * Since rates mis-match, the last LQ command may have failed.
 970                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
 971                  * ... driver.
 972                  */
 973                 lq_sta->missed_rate_counter++;
 974                 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
 975                         lq_sta->missed_rate_counter = 0;
 976                         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
 977                 }
 978                 /* Regardless, ignore this status info for outdated rate */
 979                 return;
 980         } else
 981                 /* Rate did match, so reset the missed_rate_counter */
 982                 lq_sta->missed_rate_counter = 0;
 983
 984         /* Figure out if rate scale algorithm is in active or search table */
 985         if (table_type_matches(&tbl_type,
 986                                 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
 987                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 988                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 989         } else if (table_type_matches(&tbl_type,
 990                                 &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
 991                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 992                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 993         } else {
 994                 IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n");
 995                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 996                 IWL_DEBUG_RATE(priv, "active- lq:%x, ant:%x, SGI:%d\n",
 997                         tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
 998                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 999                 IWL_DEBUG_RATE(priv, "search- lq:%x, ant:%x, SGI:%d\n",
1000                         tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
1001                 IWL_DEBUG_RATE(priv, "actual- lq:%x, ant:%x, SGI:%d\n",
1002                         tbl_type.lq_type, tbl_type.ant_type, tbl_type.is_SGI);
1003                 /*
1004                  * no matching table found, let's by-pass the data collection
1005                  * and continue to perform rate scale to find the rate table
1006                  */
1007                 rs_stay_in_table(lq_sta, true);
1008                 goto done;
1009         }
1010
1011         /*
1012          * Updating the frame history depends on whether packets were
1013          * aggregated.
1014          *
1015          * For aggregation, all packets were transmitted at the same rate, the
1016          * first index into rate scale table.
1017          */
1018         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1019                 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
1020                 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
1021                                 &rs_index);
1022                 rs_collect_tx_data(curr_tbl, rs_index,
1023                                    info->status.ampdu_len,
1024                                    info->status.ampdu_ack_len);
1025
1026                 /* Update success/fail counts if not searching for new mode */
1027                 if (lq_sta->stay_in_tbl) {
1028                         lq_sta->total_success += info->status.ampdu_ack_len;
1029                         lq_sta->total_failed += (info->status.ampdu_len -
1030                                         info->status.ampdu_ack_len);
1031                 }
1032         } else {
1033         /*
1034          * For legacy, update frame history with for each Tx retry.
1035          */
1036                 retries = info->status.rates[0].count - 1;
1037                 /* HW doesn't send more than 15 retries */
1038                 retries = min(retries, 15);
1039
1040                 /* The last transmission may have been successful */
1041                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1042                 /* Collect data for each rate used during failed TX attempts */
1043                 for (i = 0; i <= retries; ++i) {
1044                         tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
1045                         rs_get_tbl_info_from_mcs(tx_rate, priv->band,
1046                                         &tbl_type, &rs_index);
1047                         /*
1048                          * Only collect stats if retried rate is in the same RS
1049                          * table as active/search.
1050                          */
1051                         if (table_type_matches(&tbl_type, curr_tbl))
1052                                 tmp_tbl = curr_tbl;
1053                         else if (table_type_matches(&tbl_type, other_tbl))
1054                                 tmp_tbl = other_tbl;
1055                         else
1056                                 continue;
1057                         rs_collect_tx_data(tmp_tbl, rs_index, 1,
1058                                            i < retries ? 0 : legacy_success);
1059                 }
1060
1061                 /* Update success/fail counts if not searching for new mode */
1062                 if (lq_sta->stay_in_tbl) {
1063                         lq_sta->total_success += legacy_success;
1064                         lq_sta->total_failed += retries + (1 - legacy_success);
1065                 }
1066         }
1067         /* The last TX rate is cached in lq_sta; it's set in if/else above */
1068         lq_sta->last_rate_n_flags = tx_rate;
1069 done:
1070         /* See if there's a better rate or modulation mode to try. */
1071         if (sta && sta->supp_rates[sband->band])
1072                 rs_rate_scale_perform(priv, skb, sta, lq_sta);
1073
1074         if (priv->lib->bt_params && priv->lib->bt_params->advanced_bt_coexist)
1075                 rs_bt_update_lq(priv, ctx, lq_sta);
1076 }
1077
1078 /*
1079  * Begin a period of staying with a selected modulation mode.
1080  * Set "stay_in_tbl" flag to prevent any mode switches.
1081  * Set frame tx success limits according to legacy vs. high-throughput,
1082  * and reset overall (spanning all rates) tx success history statistics.
1083  * These control how long we stay using same modulation mode before
1084  * searching for a new mode.
1085  */
1086 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
1087                                  struct iwl_lq_sta *lq_sta)
1088 {
1089         IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
1090         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
1091         if (is_legacy) {
1092                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1093                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1094                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1095         } else {
1096                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1097                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1098                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1099         }
1100         lq_sta->table_count = 0;
1101         lq_sta->total_failed = 0;
1102         lq_sta->total_success = 0;
1103         lq_sta->flush_timer = jiffies;
1104         lq_sta->action_counter = 0;
1105 }
1106
1107 /*
1108  * Find correct throughput table for given mode of modulation
1109  */
1110 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1111                                       struct iwl_scale_tbl_info *tbl)
1112 {
1113         /* Used to choose among HT tables */
1114         s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1115
1116         /* Check for invalid LQ type */
1117         if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1118                 tbl->expected_tpt = expected_tpt_legacy;
1119                 return;
1120         }
1121
1122         /* Legacy rates have only one table */
1123         if (is_legacy(tbl->lq_type)) {
1124                 tbl->expected_tpt = expected_tpt_legacy;
1125                 return;
1126         }
1127
1128         /* Choose among many HT tables depending on number of streams
1129          * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
1130          * status */
1131         if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1132                 ht_tbl_pointer = expected_tpt_siso20MHz;
1133         else if (is_siso(tbl->lq_type))
1134                 ht_tbl_pointer = expected_tpt_siso40MHz;
1135         else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1136                 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1137         else if (is_mimo2(tbl->lq_type))
1138                 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1139         else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1140                 ht_tbl_pointer = expected_tpt_mimo3_20MHz;
1141         else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
1142                 ht_tbl_pointer = expected_tpt_mimo3_40MHz;
1143
1144         if (!tbl->is_SGI && !lq_sta->is_agg)            /* Normal */
1145                 tbl->expected_tpt = ht_tbl_pointer[0];
1146         else if (tbl->is_SGI && !lq_sta->is_agg)        /* SGI */
1147                 tbl->expected_tpt = ht_tbl_pointer[1];
1148         else if (!tbl->is_SGI && lq_sta->is_agg)        /* AGG */
1149                 tbl->expected_tpt = ht_tbl_pointer[2];
1150         else                                            /* AGG+SGI */
1151                 tbl->expected_tpt = ht_tbl_pointer[3];
1152 }
1153
1154 /*
1155  * Find starting rate for new "search" high-throughput mode of modulation.
1156  * Goal is to find lowest expected rate (under perfect conditions) that is
1157  * above the current measured throughput of "active" mode, to give new mode
1158  * a fair chance to prove itself without too many challenges.
1159  *
1160  * This gets called when transitioning to more aggressive modulation
1161  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1162  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1163  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1164  * bit rate will typically need to increase, but not if performance was bad.
1165  */
1166 static s32 rs_get_best_rate(struct iwl_priv *priv,
1167                             struct iwl_lq_sta *lq_sta,
1168                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1169                             u16 rate_mask, s8 index)
1170 {
1171         /* "active" values */
1172         struct iwl_scale_tbl_info *active_tbl =
1173             &(lq_sta->lq_info[lq_sta->active_tbl]);
1174         s32 active_sr = active_tbl->win[index].success_ratio;
1175         s32 active_tpt = active_tbl->expected_tpt[index];
1176
1177         /* expected "search" throughput */
1178         s32 *tpt_tbl = tbl->expected_tpt;
1179
1180         s32 new_rate, high, low, start_hi;
1181         u16 high_low;
1182         s8 rate = index;
1183
1184         new_rate = high = low = start_hi = IWL_RATE_INVALID;
1185
1186         for (; ;) {
1187                 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1188                                                 tbl->lq_type);
1189
1190                 low = high_low & 0xff;
1191                 high = (high_low >> 8) & 0xff;
1192
1193                 /*
1194                  * Lower the "search" bit rate, to give new "search" mode
1195                  * approximately the same throughput as "active" if:
1196                  *
1197                  * 1) "Active" mode has been working modestly well (but not
1198                  *    great), and expected "search" throughput (under perfect
1199                  *    conditions) at candidate rate is above the actual
1200                  *    measured "active" throughput (but less than expected
1201                  *    "active" throughput under perfect conditions).
1202                  * OR
1203                  * 2) "Active" mode has been working perfectly or very well
1204                  *    and expected "search" throughput (under perfect
1205                  *    conditions) at candidate rate is above expected
1206                  *    "active" throughput (under perfect conditions).
1207                  */
1208                 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1209                      ((active_sr > IWL_RATE_DECREASE_TH) &&
1210                       (active_sr <= IWL_RATE_HIGH_TH) &&
1211                       (tpt_tbl[rate] <= active_tpt))) ||
1212                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1213                      (tpt_tbl[rate] > active_tpt))) {
1214
1215                         /* (2nd or later pass)
1216                          * If we've already tried to raise the rate, and are
1217                          * now trying to lower it, use the higher rate. */
1218                         if (start_hi != IWL_RATE_INVALID) {
1219                                 new_rate = start_hi;
1220                                 break;
1221                         }
1222
1223                         new_rate = rate;
1224
1225                         /* Loop again with lower rate */
1226                         if (low != IWL_RATE_INVALID)
1227                                 rate = low;
1228
1229                         /* Lower rate not available, use the original */
1230                         else
1231                                 break;
1232
1233                 /* Else try to raise the "search" rate to match "active" */
1234                 } else {
1235                         /* (2nd or later pass)
1236                          * If we've already tried to lower the rate, and are
1237                          * now trying to raise it, use the lower rate. */
1238                         if (new_rate != IWL_RATE_INVALID)
1239                                 break;
1240
1241                         /* Loop again with higher rate */
1242                         else if (high != IWL_RATE_INVALID) {
1243                                 start_hi = high;
1244                                 rate = high;
1245
1246                         /* Higher rate not available, use the original */
1247                         } else {
1248                                 new_rate = rate;
1249                                 break;
1250                         }
1251                 }
1252         }
1253
1254         return new_rate;
1255 }
1256
1257 /*
1258  * Set up search table for MIMO2
1259  */
1260 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1261                              struct iwl_lq_sta *lq_sta,
1262                              struct ieee80211_conf *conf,
1263                              struct ieee80211_sta *sta,
1264                              struct iwl_scale_tbl_info *tbl, int index)
1265 {
1266         u16 rate_mask;
1267         s32 rate;
1268         s8 is_green = lq_sta->is_green;
1269         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1270         struct iwl_rxon_context *ctx = sta_priv->ctx;
1271
1272         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1273                 return -1;
1274
1275         if (sta->smps_mode == IEEE80211_SMPS_STATIC)
1276                 return -1;
1277
1278         /* Need both Tx chains/antennas to support MIMO */
1279         if (priv->hw_params.tx_chains_num < 2)
1280                 return -1;
1281
1282         IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1283
1284         tbl->lq_type = LQ_MIMO2;
1285         tbl->is_dup = lq_sta->is_dup;
1286         tbl->action = 0;
1287         tbl->max_search = IWL_MAX_SEARCH;
1288         rate_mask = lq_sta->active_mimo2_rate;
1289
1290         if (iwl_is_ht40_tx_allowed(priv, ctx, sta))
1291                 tbl->is_ht40 = 1;
1292         else
1293                 tbl->is_ht40 = 0;
1294
1295         rs_set_expected_tpt_table(lq_sta, tbl);
1296
1297         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1298
1299         IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1300         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1301                 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1302                                                 rate, rate_mask);
1303                 return -1;
1304         }
1305         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1306
1307         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1308                      tbl->current_rate, is_green);
1309         return 0;
1310 }
1311
1312 /*
1313  * Set up search table for MIMO3
1314  */
1315 static int rs_switch_to_mimo3(struct iwl_priv *priv,
1316                              struct iwl_lq_sta *lq_sta,
1317                              struct ieee80211_conf *conf,
1318                              struct ieee80211_sta *sta,
1319                              struct iwl_scale_tbl_info *tbl, int index)
1320 {
1321         u16 rate_mask;
1322         s32 rate;
1323         s8 is_green = lq_sta->is_green;
1324         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1325         struct iwl_rxon_context *ctx = sta_priv->ctx;
1326
1327         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1328                 return -1;
1329
1330         if (sta->smps_mode == IEEE80211_SMPS_STATIC)
1331                 return -1;
1332
1333         /* Need both Tx chains/antennas to support MIMO */
1334         if (priv->hw_params.tx_chains_num < 3)
1335                 return -1;
1336
1337         IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1338
1339         tbl->lq_type = LQ_MIMO3;
1340         tbl->is_dup = lq_sta->is_dup;
1341         tbl->action = 0;
1342         tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1343         rate_mask = lq_sta->active_mimo3_rate;
1344
1345         if (iwl_is_ht40_tx_allowed(priv, ctx, sta))
1346                 tbl->is_ht40 = 1;
1347         else
1348                 tbl->is_ht40 = 0;
1349
1350         rs_set_expected_tpt_table(lq_sta, tbl);
1351
1352         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1353
1354         IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1355                 rate, rate_mask);
1356         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1357                 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1358                                                 rate, rate_mask);
1359                 return -1;
1360         }
1361         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1362
1363         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1364                      tbl->current_rate, is_green);
1365         return 0;
1366 }
1367
1368 /*
1369  * Set up search table for SISO
1370  */
1371 static int rs_switch_to_siso(struct iwl_priv *priv,
1372                              struct iwl_lq_sta *lq_sta,
1373                              struct ieee80211_conf *conf,
1374                              struct ieee80211_sta *sta,
1375                              struct iwl_scale_tbl_info *tbl, int index)
1376 {
1377         u16 rate_mask;
1378         u8 is_green = lq_sta->is_green;
1379         s32 rate;
1380         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1381         struct iwl_rxon_context *ctx = sta_priv->ctx;
1382
1383         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1384                 return -1;
1385
1386         IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1387
1388         tbl->is_dup = lq_sta->is_dup;
1389         tbl->lq_type = LQ_SISO;
1390         tbl->action = 0;
1391         tbl->max_search = IWL_MAX_SEARCH;
1392         rate_mask = lq_sta->active_siso_rate;
1393
1394         if (iwl_is_ht40_tx_allowed(priv, ctx, sta))
1395                 tbl->is_ht40 = 1;
1396         else
1397                 tbl->is_ht40 = 0;
1398
1399         if (is_green)
1400                 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1401
1402         rs_set_expected_tpt_table(lq_sta, tbl);
1403         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1404
1405         IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1406         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1407                 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1408                              rate, rate_mask);
1409                 return -1;
1410         }
1411         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1412         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1413                      tbl->current_rate, is_green);
1414         return 0;
1415 }
1416
1417 /*
1418  * Try to switch to new modulation mode from legacy
1419  */
1420 static int rs_move_legacy_other(struct iwl_priv *priv,
1421                                 struct iwl_lq_sta *lq_sta,
1422                                 struct ieee80211_conf *conf,
1423                                 struct ieee80211_sta *sta,
1424                                 int index)
1425 {
1426         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1427         struct iwl_scale_tbl_info *search_tbl =
1428                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1429         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1430         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1431                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1432         u8 start_action;
1433         u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1434         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1435         int ret = 0;
1436         u8 update_search_tbl_counter = 0;
1437
1438         switch (priv->bt_traffic_load) {
1439         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1440                 /* nothing */
1441                 break;
1442         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1443                 /* avoid antenna B unless MIMO */
1444                 if (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2)
1445                         tbl->action = IWL_LEGACY_SWITCH_SISO;
1446                 break;
1447         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1448         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1449                 /* avoid antenna B and MIMO */
1450                 valid_tx_ant =
1451                         first_antenna(priv->nvm_data->valid_tx_ant);
1452                 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2 &&
1453                     tbl->action != IWL_LEGACY_SWITCH_SISO)
1454                         tbl->action = IWL_LEGACY_SWITCH_SISO;
1455                 break;
1456         default:
1457                 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1458                 break;
1459         }
1460
1461         if (!iwl_ht_enabled(priv))
1462                 /* stay in Legacy */
1463                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1464         else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1465                    tbl->action > IWL_LEGACY_SWITCH_SISO)
1466                 tbl->action = IWL_LEGACY_SWITCH_SISO;
1467
1468         /* configure as 1x1 if bt full concurrency */
1469         if (priv->bt_full_concurrent) {
1470                 if (!iwl_ht_enabled(priv))
1471                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1472                 else if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1473                         tbl->action = IWL_LEGACY_SWITCH_SISO;
1474                 valid_tx_ant =
1475                         first_antenna(priv->nvm_data->valid_tx_ant);
1476         }
1477
1478         start_action = tbl->action;
1479         for (; ;) {
1480                 lq_sta->action_counter++;
1481                 switch (tbl->action) {
1482                 case IWL_LEGACY_SWITCH_ANTENNA1:
1483                 case IWL_LEGACY_SWITCH_ANTENNA2:
1484                         IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1485
1486                         if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1487                                                         tx_chains_num <= 1) ||
1488                             (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1489                                                         tx_chains_num <= 2))
1490                                 break;
1491
1492                         /* Don't change antenna if success has been great */
1493                         if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1494                             !priv->bt_full_concurrent &&
1495                             priv->bt_traffic_load ==
1496                                         IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1497                                 break;
1498
1499                         /* Set up search table to try other antenna */
1500                         memcpy(search_tbl, tbl, sz);
1501
1502                         if (rs_toggle_antenna(valid_tx_ant,
1503                                 &search_tbl->current_rate, search_tbl)) {
1504                                 update_search_tbl_counter = 1;
1505                                 rs_set_expected_tpt_table(lq_sta, search_tbl);
1506                                 goto out;
1507                         }
1508                         break;
1509                 case IWL_LEGACY_SWITCH_SISO:
1510                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1511
1512                         /* Set up search table to try SISO */
1513                         memcpy(search_tbl, tbl, sz);
1514                         search_tbl->is_SGI = 0;
1515                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1516                                                  search_tbl, index);
1517                         if (!ret) {
1518                                 lq_sta->action_counter = 0;
1519                                 goto out;
1520                         }
1521
1522                         break;
1523                 case IWL_LEGACY_SWITCH_MIMO2_AB:
1524                 case IWL_LEGACY_SWITCH_MIMO2_AC:
1525                 case IWL_LEGACY_SWITCH_MIMO2_BC:
1526                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1527
1528                         /* Set up search table to try MIMO */
1529                         memcpy(search_tbl, tbl, sz);
1530                         search_tbl->is_SGI = 0;
1531
1532                         if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1533                                 search_tbl->ant_type = ANT_AB;
1534                         else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1535                                 search_tbl->ant_type = ANT_AC;
1536                         else
1537                                 search_tbl->ant_type = ANT_BC;
1538
1539                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1540                                 break;
1541
1542                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1543                                                  search_tbl, index);
1544                         if (!ret) {
1545                                 lq_sta->action_counter = 0;
1546                                 goto out;
1547                         }
1548                         break;
1549
1550                 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1551                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1552
1553                         /* Set up search table to try MIMO3 */
1554                         memcpy(search_tbl, tbl, sz);
1555                         search_tbl->is_SGI = 0;
1556
1557                         search_tbl->ant_type = ANT_ABC;
1558
1559                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1560                                 break;
1561
1562                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1563                                                  search_tbl, index);
1564                         if (!ret) {
1565                                 lq_sta->action_counter = 0;
1566                                 goto out;
1567                         }
1568                         break;
1569                 }
1570                 tbl->action++;
1571                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1572                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1573
1574                 if (tbl->action == start_action)
1575                         break;
1576
1577         }
1578         search_tbl->lq_type = LQ_NONE;
1579         return 0;
1580
1581 out:
1582         lq_sta->search_better_tbl = 1;
1583         tbl->action++;
1584         if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1585                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1586         if (update_search_tbl_counter)
1587                 search_tbl->action = tbl->action;
1588         return 0;
1589
1590 }
1591
1592 /*
1593  * Try to switch to new modulation mode from SISO
1594  */
1595 static int rs_move_siso_to_other(struct iwl_priv *priv,
1596                                  struct iwl_lq_sta *lq_sta,
1597                                  struct ieee80211_conf *conf,
1598                                  struct ieee80211_sta *sta, int index)
1599 {
1600         u8 is_green = lq_sta->is_green;
1601         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1602         struct iwl_scale_tbl_info *search_tbl =
1603                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1604         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1605         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1606         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1607                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1608         u8 start_action;
1609         u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1610         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1611         u8 update_search_tbl_counter = 0;
1612         int ret;
1613
1614         switch (priv->bt_traffic_load) {
1615         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1616                 /* nothing */
1617                 break;
1618         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1619                 /* avoid antenna B unless MIMO */
1620                 if (tbl->action == IWL_SISO_SWITCH_ANTENNA2)
1621                         tbl->action = IWL_SISO_SWITCH_MIMO2_AB;
1622                 break;
1623         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1624         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1625                 /* avoid antenna B and MIMO */
1626                 valid_tx_ant =
1627                         first_antenna(priv->nvm_data->valid_tx_ant);
1628                 if (tbl->action != IWL_SISO_SWITCH_ANTENNA1)
1629                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1630                 break;
1631         default:
1632                 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1633                 break;
1634         }
1635
1636         if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1637             tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1638                 /* stay in SISO */
1639                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1640         }
1641
1642         /* configure as 1x1 if bt full concurrency */
1643         if (priv->bt_full_concurrent) {
1644                 valid_tx_ant =
1645                         first_antenna(priv->nvm_data->valid_tx_ant);
1646                 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1647                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1648         }
1649
1650         start_action = tbl->action;
1651         for (;;) {
1652                 lq_sta->action_counter++;
1653                 switch (tbl->action) {
1654                 case IWL_SISO_SWITCH_ANTENNA1:
1655                 case IWL_SISO_SWITCH_ANTENNA2:
1656                         IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1657                         if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1658                                                 tx_chains_num <= 1) ||
1659                             (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1660                                                 tx_chains_num <= 2))
1661                                 break;
1662
1663                         if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1664                             !priv->bt_full_concurrent &&
1665                             priv->bt_traffic_load ==
1666                                         IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1667                                 break;
1668
1669                         memcpy(search_tbl, tbl, sz);
1670                         if (rs_toggle_antenna(valid_tx_ant,
1671                                        &search_tbl->current_rate, search_tbl)) {
1672                                 update_search_tbl_counter = 1;
1673                                 goto out;
1674                         }
1675                         break;
1676                 case IWL_SISO_SWITCH_MIMO2_AB:
1677                 case IWL_SISO_SWITCH_MIMO2_AC:
1678                 case IWL_SISO_SWITCH_MIMO2_BC:
1679                         IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1680                         memcpy(search_tbl, tbl, sz);
1681                         search_tbl->is_SGI = 0;
1682
1683                         if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1684                                 search_tbl->ant_type = ANT_AB;
1685                         else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1686                                 search_tbl->ant_type = ANT_AC;
1687                         else
1688                                 search_tbl->ant_type = ANT_BC;
1689
1690                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1691                                 break;
1692
1693                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1694                                                  search_tbl, index);
1695                         if (!ret)
1696                                 goto out;
1697                         break;
1698                 case IWL_SISO_SWITCH_GI:
1699                         if (!tbl->is_ht40 && !(ht_cap->cap &
1700                                                 IEEE80211_HT_CAP_SGI_20))
1701                                 break;
1702                         if (tbl->is_ht40 && !(ht_cap->cap &
1703                                                 IEEE80211_HT_CAP_SGI_40))
1704                                 break;
1705
1706                         IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1707
1708                         memcpy(search_tbl, tbl, sz);
1709                         if (is_green) {
1710                                 if (!tbl->is_SGI)
1711                                         break;
1712                                 else
1713                                         IWL_ERR(priv,
1714                                                 "SGI was set in GF+SISO\n");
1715                         }
1716                         search_tbl->is_SGI = !tbl->is_SGI;
1717                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1718                         if (tbl->is_SGI) {
1719                                 s32 tpt = lq_sta->last_tpt / 100;
1720                                 if (tpt >= search_tbl->expected_tpt[index])
1721                                         break;
1722                         }
1723                         search_tbl->current_rate =
1724                                 rate_n_flags_from_tbl(priv, search_tbl,
1725                                                       index, is_green);
1726                         update_search_tbl_counter = 1;
1727                         goto out;
1728                 case IWL_SISO_SWITCH_MIMO3_ABC:
1729                         IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1730                         memcpy(search_tbl, tbl, sz);
1731                         search_tbl->is_SGI = 0;
1732                         search_tbl->ant_type = ANT_ABC;
1733
1734                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1735                                 break;
1736
1737                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1738                                                  search_tbl, index);
1739                         if (!ret)
1740                                 goto out;
1741                         break;
1742                 }
1743                 tbl->action++;
1744                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1745                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1746
1747                 if (tbl->action == start_action)
1748                         break;
1749         }
1750         search_tbl->lq_type = LQ_NONE;
1751         return 0;
1752
1753  out:
1754         lq_sta->search_better_tbl = 1;
1755         tbl->action++;
1756         if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1757                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1758         if (update_search_tbl_counter)
1759                 search_tbl->action = tbl->action;
1760
1761         return 0;
1762 }
1763
1764 /*
1765  * Try to switch to new modulation mode from MIMO2
1766  */
1767 static int rs_move_mimo2_to_other(struct iwl_priv *priv,
1768                                  struct iwl_lq_sta *lq_sta,
1769                                  struct ieee80211_conf *conf,
1770                                  struct ieee80211_sta *sta, int index)
1771 {
1772         s8 is_green = lq_sta->is_green;
1773         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1774         struct iwl_scale_tbl_info *search_tbl =
1775                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1776         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1777         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1778         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1779                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1780         u8 start_action;
1781         u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1782         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1783         u8 update_search_tbl_counter = 0;
1784         int ret;
1785
1786         switch (priv->bt_traffic_load) {
1787         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1788                 /* nothing */
1789                 break;
1790         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1791         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1792                 /* avoid antenna B and MIMO */
1793                 if (tbl->action != IWL_MIMO2_SWITCH_SISO_A)
1794                         tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1795                 break;
1796         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1797                 /* avoid antenna B unless MIMO */
1798                 if (tbl->action == IWL_MIMO2_SWITCH_SISO_B ||
1799                     tbl->action == IWL_MIMO2_SWITCH_SISO_C)
1800                         tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1801                 break;
1802         default:
1803                 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1804                 break;
1805         }
1806
1807         if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1808             (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1809              tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1810                 /* switch in SISO */
1811                 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1812         }
1813
1814         /* configure as 1x1 if bt full concurrency */
1815         if (priv->bt_full_concurrent &&
1816             (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1817              tbl->action > IWL_MIMO2_SWITCH_SISO_C))
1818                 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1819
1820         start_action = tbl->action;
1821         for (;;) {
1822                 lq_sta->action_counter++;
1823                 switch (tbl->action) {
1824                 case IWL_MIMO2_SWITCH_ANTENNA1:
1825                 case IWL_MIMO2_SWITCH_ANTENNA2:
1826                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1827
1828                         if (tx_chains_num <= 2)
1829                                 break;
1830
1831                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1832                                 break;
1833
1834                         memcpy(search_tbl, tbl, sz);
1835                         if (rs_toggle_antenna(valid_tx_ant,
1836                                        &search_tbl->current_rate, search_tbl)) {
1837                                 update_search_tbl_counter = 1;
1838                                 goto out;
1839                         }
1840                         break;
1841                 case IWL_MIMO2_SWITCH_SISO_A:
1842                 case IWL_MIMO2_SWITCH_SISO_B:
1843                 case IWL_MIMO2_SWITCH_SISO_C:
1844                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1845
1846                         /* Set up new search table for SISO */
1847                         memcpy(search_tbl, tbl, sz);
1848
1849                         if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1850                                 search_tbl->ant_type = ANT_A;
1851                         else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1852                                 search_tbl->ant_type = ANT_B;
1853                         else
1854                                 search_tbl->ant_type = ANT_C;
1855
1856                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1857                                 break;
1858
1859                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1860                                                  search_tbl, index);
1861                         if (!ret)
1862                                 goto out;
1863
1864                         break;
1865
1866                 case IWL_MIMO2_SWITCH_GI:
1867                         if (!tbl->is_ht40 && !(ht_cap->cap &
1868                                                 IEEE80211_HT_CAP_SGI_20))
1869                                 break;
1870                         if (tbl->is_ht40 && !(ht_cap->cap &
1871                                                 IEEE80211_HT_CAP_SGI_40))
1872                                 break;
1873
1874                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1875
1876                         /* Set up new search table for MIMO2 */
1877                         memcpy(search_tbl, tbl, sz);
1878                         search_tbl->is_SGI = !tbl->is_SGI;
1879                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1880                         /*
1881                          * If active table already uses the fastest possible
1882                          * modulation (dual stream with short guard interval),
1883                          * and it's working well, there's no need to look
1884                          * for a better type of modulation!
1885                          */
1886                         if (tbl->is_SGI) {
1887                                 s32 tpt = lq_sta->last_tpt / 100;
1888                                 if (tpt >= search_tbl->expected_tpt[index])
1889                                         break;
1890                         }
1891                         search_tbl->current_rate =
1892                                 rate_n_flags_from_tbl(priv, search_tbl,
1893                                                       index, is_green);
1894                         update_search_tbl_counter = 1;
1895                         goto out;
1896
1897                 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1898                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1899                         memcpy(search_tbl, tbl, sz);
1900                         search_tbl->is_SGI = 0;
1901                         search_tbl->ant_type = ANT_ABC;
1902
1903                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1904                                 break;
1905
1906                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1907                                                  search_tbl, index);
1908                         if (!ret)
1909                                 goto out;
1910
1911                         break;
1912                 }
1913                 tbl->action++;
1914                 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1915                         tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1916
1917                 if (tbl->action == start_action)
1918                         break;
1919         }
1920         search_tbl->lq_type = LQ_NONE;
1921         return 0;
1922  out:
1923         lq_sta->search_better_tbl = 1;
1924         tbl->action++;
1925         if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1926                 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1927         if (update_search_tbl_counter)
1928                 search_tbl->action = tbl->action;
1929
1930         return 0;
1931
1932 }
1933
1934 /*
1935  * Try to switch to new modulation mode from MIMO3
1936  */
1937 static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1938                                  struct iwl_lq_sta *lq_sta,
1939                                  struct ieee80211_conf *conf,
1940                                  struct ieee80211_sta *sta, int index)
1941 {
1942         s8 is_green = lq_sta->is_green;
1943         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1944         struct iwl_scale_tbl_info *search_tbl =
1945                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1946         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1947         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1948         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1949                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1950         u8 start_action;
1951         u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1952         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1953         int ret;
1954         u8 update_search_tbl_counter = 0;
1955
1956         switch (priv->bt_traffic_load) {
1957         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1958                 /* nothing */
1959                 break;
1960         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1961         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1962                 /* avoid antenna B and MIMO */
1963                 if (tbl->action != IWL_MIMO3_SWITCH_SISO_A)
1964                         tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1965                 break;
1966         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1967                 /* avoid antenna B unless MIMO */
1968                 if (tbl->action == IWL_MIMO3_SWITCH_SISO_B ||
1969                     tbl->action == IWL_MIMO3_SWITCH_SISO_C)
1970                         tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1971                 break;
1972         default:
1973                 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1974                 break;
1975         }
1976
1977         if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1978             (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1979              tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1980                 /* switch in SISO */
1981                 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1982         }
1983
1984         /* configure as 1x1 if bt full concurrency */
1985         if (priv->bt_full_concurrent &&
1986             (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1987              tbl->action > IWL_MIMO3_SWITCH_SISO_C))
1988                 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1989
1990         start_action = tbl->action;
1991         for (;;) {
1992                 lq_sta->action_counter++;
1993                 switch (tbl->action) {
1994                 case IWL_MIMO3_SWITCH_ANTENNA1:
1995                 case IWL_MIMO3_SWITCH_ANTENNA2:
1996                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
1997
1998                         if (tx_chains_num <= 3)
1999                                 break;
2000
2001                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
2002                                 break;
2003
2004                         memcpy(search_tbl, tbl, sz);
2005                         if (rs_toggle_antenna(valid_tx_ant,
2006                                        &search_tbl->current_rate, search_tbl))
2007                                 goto out;
2008                         break;
2009                 case IWL_MIMO3_SWITCH_SISO_A:
2010                 case IWL_MIMO3_SWITCH_SISO_B:
2011                 case IWL_MIMO3_SWITCH_SISO_C:
2012                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
2013
2014                         /* Set up new search table for SISO */
2015                         memcpy(search_tbl, tbl, sz);
2016
2017                         if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
2018                                 search_tbl->ant_type = ANT_A;
2019                         else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
2020                                 search_tbl->ant_type = ANT_B;
2021                         else
2022                                 search_tbl->ant_type = ANT_C;
2023
2024                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2025                                 break;
2026
2027                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
2028                                                  search_tbl, index);
2029                         if (!ret)
2030                                 goto out;
2031
2032                         break;
2033
2034                 case IWL_MIMO3_SWITCH_MIMO2_AB:
2035                 case IWL_MIMO3_SWITCH_MIMO2_AC:
2036                 case IWL_MIMO3_SWITCH_MIMO2_BC:
2037                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
2038
2039                         memcpy(search_tbl, tbl, sz);
2040                         search_tbl->is_SGI = 0;
2041                         if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
2042                                 search_tbl->ant_type = ANT_AB;
2043                         else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
2044                                 search_tbl->ant_type = ANT_AC;
2045                         else
2046                                 search_tbl->ant_type = ANT_BC;
2047
2048                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2049                                 break;
2050
2051                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
2052                                                  search_tbl, index);
2053                         if (!ret)
2054                                 goto out;
2055
2056                         break;
2057
2058                 case IWL_MIMO3_SWITCH_GI:
2059                         if (!tbl->is_ht40 && !(ht_cap->cap &
2060                                                 IEEE80211_HT_CAP_SGI_20))
2061                                 break;
2062                         if (tbl->is_ht40 && !(ht_cap->cap &
2063                                                 IEEE80211_HT_CAP_SGI_40))
2064                                 break;
2065
2066                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
2067
2068                         /* Set up new search table for MIMO */
2069                         memcpy(search_tbl, tbl, sz);
2070                         search_tbl->is_SGI = !tbl->is_SGI;
2071                         rs_set_expected_tpt_table(lq_sta, search_tbl);
2072                         /*
2073                          * If active table already uses the fastest possible
2074                          * modulation (dual stream with short guard interval),
2075                          * and it's working well, there's no need to look
2076                          * for a better type of modulation!
2077                          */
2078                         if (tbl->is_SGI) {
2079                                 s32 tpt = lq_sta->last_tpt / 100;
2080                                 if (tpt >= search_tbl->expected_tpt[index])
2081                                         break;
2082                         }
2083                         search_tbl->current_rate =
2084                                 rate_n_flags_from_tbl(priv, search_tbl,
2085                                                       index, is_green);
2086                         update_search_tbl_counter = 1;
2087                         goto out;
2088                 }
2089                 tbl->action++;
2090                 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2091                         tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2092
2093                 if (tbl->action == start_action)
2094                         break;
2095         }
2096         search_tbl->lq_type = LQ_NONE;
2097         return 0;
2098  out:
2099         lq_sta->search_better_tbl = 1;
2100         tbl->action++;
2101         if (tbl->action > IWL_MIMO3_SWITCH_GI)
2102                 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2103         if (update_search_tbl_counter)
2104                 search_tbl->action = tbl->action;
2105
2106         return 0;
2107
2108 }
2109
2110 /*
2111  * Check whether we should continue using same modulation mode, or
2112  * begin search for a new mode, based on:
2113  * 1) # tx successes or failures while using this mode
2114  * 2) # times calling this function
2115  * 3) elapsed time in this mode (not used, for now)
2116  */
2117 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
2118 {
2119         struct iwl_scale_tbl_info *tbl;
2120         int i;
2121         int active_tbl;
2122         int flush_interval_passed = 0;
2123         struct iwl_priv *priv;
2124
2125         priv = lq_sta->drv;
2126         active_tbl = lq_sta->active_tbl;
2127
2128         tbl = &(lq_sta->lq_info[active_tbl]);
2129
2130         /* If we've been disallowing search, see if we should now allow it */
2131         if (lq_sta->stay_in_tbl) {
2132
2133                 /* Elapsed time using current modulation mode */
2134                 if (lq_sta->flush_timer)
2135                         flush_interval_passed =
2136                         time_after(jiffies,
2137                                         (unsigned long)(lq_sta->flush_timer +
2138                                         IWL_RATE_SCALE_FLUSH_INTVL));
2139
2140                 /*
2141                  * Check if we should allow search for new modulation mode.
2142                  * If many frames have failed or succeeded, or we've used
2143                  * this same modulation for a long time, allow search, and
2144                  * reset history stats that keep track of whether we should
2145                  * allow a new search.  Also (below) reset all bitmaps and
2146                  * stats in active history.
2147                  */
2148                 if (force_search ||
2149                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
2150                     (lq_sta->total_success > lq_sta->max_success_limit) ||
2151                     ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
2152                      && (flush_interval_passed))) {
2153                         IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n",
2154                                      lq_sta->total_failed,
2155                                      lq_sta->total_success,
2156                                      flush_interval_passed);
2157
2158                         /* Allow search for new mode */
2159                         lq_sta->stay_in_tbl = 0;        /* only place reset */
2160                         lq_sta->total_failed = 0;
2161                         lq_sta->total_success = 0;
2162                         lq_sta->flush_timer = 0;
2163
2164                 /*
2165                  * Else if we've used this modulation mode enough repetitions
2166                  * (regardless of elapsed time or success/failure), reset
2167                  * history bitmaps and rate-specific stats for all rates in
2168                  * active table.
2169                  */
2170                 } else {
2171                         lq_sta->table_count++;
2172                         if (lq_sta->table_count >=
2173                             lq_sta->table_count_limit) {
2174                                 lq_sta->table_count = 0;
2175
2176                                 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
2177                                 for (i = 0; i < IWL_RATE_COUNT; i++)
2178                                         rs_rate_scale_clear_window(
2179                                                 &(tbl->win[i]));
2180                         }
2181                 }
2182
2183                 /* If transitioning to allow "search", reset all history
2184                  * bitmaps and stats in active table (this will become the new
2185                  * "search" table). */
2186                 if (!lq_sta->stay_in_tbl) {
2187                         for (i = 0; i < IWL_RATE_COUNT; i++)
2188                                 rs_rate_scale_clear_window(&(tbl->win[i]));
2189                 }
2190         }
2191 }
2192
2193 /*
2194  * setup rate table in uCode
2195  */
2196 static void rs_update_rate_tbl(struct iwl_priv *priv,
2197                                struct iwl_rxon_context *ctx,
2198                                struct iwl_lq_sta *lq_sta,
2199                                struct iwl_scale_tbl_info *tbl,
2200                                int index, u8 is_green)
2201 {
2202         u32 rate;
2203
2204         /* Update uCode's rate table. */
2205         rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2206         rs_fill_link_cmd(priv, lq_sta, rate);
2207         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2208 }
2209
2210 /*
2211  * Do rate scaling and search for new modulation mode.
2212  */
2213 static void rs_rate_scale_perform(struct iwl_priv *priv,
2214                                   struct sk_buff *skb,
2215                                   struct ieee80211_sta *sta,
2216                                   struct iwl_lq_sta *lq_sta)
2217 {
2218         struct ieee80211_hw *hw = priv->hw;
2219         struct ieee80211_conf *conf = &hw->conf;
2220         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2221         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2222         int low = IWL_RATE_INVALID;
2223         int high = IWL_RATE_INVALID;
2224         int index;
2225         int i;
2226         struct iwl_rate_scale_data *window = NULL;
2227         int current_tpt = IWL_INVALID_VALUE;
2228         int low_tpt = IWL_INVALID_VALUE;
2229         int high_tpt = IWL_INVALID_VALUE;
2230         u32 fail_count;
2231         s8 scale_action = 0;
2232         u16 rate_mask;
2233         u8 update_lq = 0;
2234         struct iwl_scale_tbl_info *tbl, *tbl1;
2235         u16 rate_scale_index_msk = 0;
2236         u8 is_green = 0;
2237         u8 active_tbl = 0;
2238         u8 done_search = 0;
2239         u16 high_low;
2240         s32 sr;
2241         u8 tid = IWL_MAX_TID_COUNT;
2242         struct iwl_tid_data *tid_data;
2243         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
2244         struct iwl_rxon_context *ctx = sta_priv->ctx;
2245
2246         IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
2247
2248         /* Send management frames and NO_ACK data using lowest rate. */
2249         /* TODO: this could probably be improved.. */
2250         if (!ieee80211_is_data(hdr->frame_control) ||
2251             info->flags & IEEE80211_TX_CTL_NO_ACK)
2252                 return;
2253
2254         lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
2255
2256         tid = rs_tl_add_packet(lq_sta, hdr);
2257         if ((tid != IWL_MAX_TID_COUNT) &&
2258             (lq_sta->tx_agg_tid_en & (1 << tid))) {
2259                 tid_data = &priv->tid_data[lq_sta->lq.sta_id][tid];
2260                 if (tid_data->agg.state == IWL_AGG_OFF)
2261                         lq_sta->is_agg = 0;
2262                 else
2263                         lq_sta->is_agg = 1;
2264         } else
2265                 lq_sta->is_agg = 0;
2266
2267         /*
2268          * Select rate-scale / modulation-mode table to work with in
2269          * the rest of this function:  "search" if searching for better
2270          * modulation mode, or "active" if doing rate scaling within a mode.
2271          */
2272         if (!lq_sta->search_better_tbl)
2273                 active_tbl = lq_sta->active_tbl;
2274         else
2275                 active_tbl = 1 - lq_sta->active_tbl;
2276
2277         tbl = &(lq_sta->lq_info[active_tbl]);
2278         if (is_legacy(tbl->lq_type))
2279                 lq_sta->is_green = 0;
2280         else
2281                 lq_sta->is_green = rs_use_green(sta);
2282         is_green = lq_sta->is_green;
2283
2284         /* current tx rate */
2285         index = lq_sta->last_txrate_idx;
2286
2287         IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2288                        tbl->lq_type);
2289
2290         /* rates available for this association, and for modulation mode */
2291         rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2292
2293         IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
2294
2295         /* mask with station rate restriction */
2296         if (is_legacy(tbl->lq_type)) {
2297                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2298                         /* supp_rates has no CCK bits in A mode */
2299                         rate_scale_index_msk = (u16) (rate_mask &
2300                                 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2301                 else
2302                         rate_scale_index_msk = (u16) (rate_mask &
2303                                                       lq_sta->supp_rates);
2304
2305         } else
2306                 rate_scale_index_msk = rate_mask;
2307
2308         if (!rate_scale_index_msk)
2309                 rate_scale_index_msk = rate_mask;
2310
2311         if (!((1 << index) & rate_scale_index_msk)) {
2312                 IWL_ERR(priv, "Current Rate is not valid\n");
2313                 if (lq_sta->search_better_tbl) {
2314                         /* revert to active table if search table is not valid*/
2315                         tbl->lq_type = LQ_NONE;
2316                         lq_sta->search_better_tbl = 0;
2317                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2318                         /* get "active" rate info */
2319                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2320                         rs_update_rate_tbl(priv, ctx, lq_sta, tbl,
2321                                            index, is_green);
2322                 }
2323                 return;
2324         }
2325
2326         /* Get expected throughput table and history window for current rate */
2327         if (!tbl->expected_tpt) {
2328                 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2329                 return;
2330         }
2331
2332         /* force user max rate if set by user */
2333         if ((lq_sta->max_rate_idx != -1) &&
2334             (lq_sta->max_rate_idx < index)) {
2335                 index = lq_sta->max_rate_idx;
2336                 update_lq = 1;
2337                 window = &(tbl->win[index]);
2338                 goto lq_update;
2339         }
2340
2341         window = &(tbl->win[index]);
2342
2343         /*
2344          * If there is not enough history to calculate actual average
2345          * throughput, keep analyzing results of more tx frames, without
2346          * changing rate or mode (bypass most of the rest of this function).
2347          * Set up new rate table in uCode only if old rate is not supported
2348          * in current association (use new rate found above).
2349          */
2350         fail_count = window->counter - window->success_counter;
2351         if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2352                         (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2353                 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2354                                "for index %d\n",
2355                                window->success_counter, window->counter, index);
2356
2357                 /* Can't calculate this yet; not enough history */
2358                 window->average_tpt = IWL_INVALID_VALUE;
2359
2360                 /* Should we stay with this modulation mode,
2361                  * or search for a new one? */
2362                 rs_stay_in_table(lq_sta, false);
2363
2364                 goto out;
2365         }
2366         /* Else we have enough samples; calculate estimate of
2367          * actual average throughput */
2368         if (window->average_tpt != ((window->success_ratio *
2369                         tbl->expected_tpt[index] + 64) / 128)) {
2370                 IWL_ERR(priv, "expected_tpt should have been calculated by now\n");
2371                 window->average_tpt = ((window->success_ratio *
2372                                         tbl->expected_tpt[index] + 64) / 128);
2373         }
2374
2375         /* If we are searching for better modulation mode, check success. */
2376         if (lq_sta->search_better_tbl &&
2377             (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
2378                 /* If good success, continue using the "search" mode;
2379                  * no need to send new link quality command, since we're
2380                  * continuing to use the setup that we've been trying. */
2381                 if (window->average_tpt > lq_sta->last_tpt) {
2382
2383                         IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2384                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
2385                                         window->success_ratio,
2386                                         window->average_tpt,
2387                                         lq_sta->last_tpt);
2388
2389                         if (!is_legacy(tbl->lq_type))
2390                                 lq_sta->enable_counter = 1;
2391
2392                         /* Swap tables; "search" becomes "active" */
2393                         lq_sta->active_tbl = active_tbl;
2394                         current_tpt = window->average_tpt;
2395
2396                 /* Else poor success; go back to mode in "active" table */
2397                 } else {
2398
2399                         IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2400                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
2401                                         window->success_ratio,
2402                                         window->average_tpt,
2403                                         lq_sta->last_tpt);
2404
2405                         /* Nullify "search" table */
2406                         tbl->lq_type = LQ_NONE;
2407
2408                         /* Revert to "active" table */
2409                         active_tbl = lq_sta->active_tbl;
2410                         tbl = &(lq_sta->lq_info[active_tbl]);
2411
2412                         /* Revert to "active" rate and throughput info */
2413                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2414                         current_tpt = lq_sta->last_tpt;
2415
2416                         /* Need to set up a new rate table in uCode */
2417                         update_lq = 1;
2418                 }
2419
2420                 /* Either way, we've made a decision; modulation mode
2421                  * search is done, allow rate adjustment next time. */
2422                 lq_sta->search_better_tbl = 0;
2423                 done_search = 1;        /* Don't switch modes below! */
2424                 goto lq_update;
2425         }
2426
2427         /* (Else) not in search of better modulation mode, try for better
2428          * starting rate, while staying in this mode. */
2429         high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2430                                         tbl->lq_type);
2431         low = high_low & 0xff;
2432         high = (high_low >> 8) & 0xff;
2433
2434         /* If user set max rate, dont allow higher than user constrain */
2435         if ((lq_sta->max_rate_idx != -1) &&
2436             (lq_sta->max_rate_idx < high))
2437                 high = IWL_RATE_INVALID;
2438
2439         sr = window->success_ratio;
2440
2441         /* Collect measured throughputs for current and adjacent rates */
2442         current_tpt = window->average_tpt;
2443         if (low != IWL_RATE_INVALID)
2444                 low_tpt = tbl->win[low].average_tpt;
2445         if (high != IWL_RATE_INVALID)
2446                 high_tpt = tbl->win[high].average_tpt;
2447
2448         scale_action = 0;
2449
2450         /* Too many failures, decrease rate */
2451         if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2452                 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2453                 scale_action = -1;
2454
2455         /* No throughput measured yet for adjacent rates; try increase. */
2456         } else if ((low_tpt == IWL_INVALID_VALUE) &&
2457                    (high_tpt == IWL_INVALID_VALUE)) {
2458
2459                 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2460                         scale_action = 1;
2461                 else if (low != IWL_RATE_INVALID)
2462                         scale_action = 0;
2463         }
2464
2465         /* Both adjacent throughputs are measured, but neither one has better
2466          * throughput; we're using the best rate, don't change it! */
2467         else if ((low_tpt != IWL_INVALID_VALUE) &&
2468                  (high_tpt != IWL_INVALID_VALUE) &&
2469                  (low_tpt < current_tpt) &&
2470                  (high_tpt < current_tpt))
2471                 scale_action = 0;
2472
2473         /* At least one adjacent rate's throughput is measured,
2474          * and may have better performance. */
2475         else {
2476                 /* Higher adjacent rate's throughput is measured */
2477                 if (high_tpt != IWL_INVALID_VALUE) {
2478                         /* Higher rate has better throughput */
2479                         if (high_tpt > current_tpt &&
2480                                         sr >= IWL_RATE_INCREASE_TH) {
2481                                 scale_action = 1;
2482                         } else {
2483                                 scale_action = 0;
2484                         }
2485
2486                 /* Lower adjacent rate's throughput is measured */
2487                 } else if (low_tpt != IWL_INVALID_VALUE) {
2488                         /* Lower rate has better throughput */
2489                         if (low_tpt > current_tpt) {
2490                                 IWL_DEBUG_RATE(priv,
2491                                     "decrease rate because of low tpt\n");
2492                                 scale_action = -1;
2493                         } else if (sr >= IWL_RATE_INCREASE_TH) {
2494                                 scale_action = 1;
2495                         }
2496                 }
2497         }
2498
2499         /* Sanity check; asked for decrease, but success rate or throughput
2500          * has been good at old rate.  Don't change it. */
2501         if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2502                     ((sr > IWL_RATE_HIGH_TH) ||
2503                      (current_tpt > (100 * tbl->expected_tpt[low]))))
2504                 scale_action = 0;
2505         if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2506                 scale_action = -1;
2507         if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
2508                 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2509                 scale_action = -1;
2510
2511         if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2512              (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2513                 if (lq_sta->last_bt_traffic > priv->bt_traffic_load) {
2514                         /*
2515                          * don't set scale_action, don't want to scale up if
2516                          * the rate scale doesn't otherwise think that is a
2517                          * good idea.
2518                          */
2519                 } else if (lq_sta->last_bt_traffic <= priv->bt_traffic_load) {
2520                         scale_action = -1;
2521                 }
2522         }
2523         lq_sta->last_bt_traffic = priv->bt_traffic_load;
2524
2525         if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2526              (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2527                 /* search for a new modulation */
2528                 rs_stay_in_table(lq_sta, true);
2529                 goto lq_update;
2530         }
2531
2532         switch (scale_action) {
2533         case -1:
2534                 /* Decrease starting rate, update uCode's rate table */
2535                 if (low != IWL_RATE_INVALID) {
2536                         update_lq = 1;
2537                         index = low;
2538                 }
2539
2540                 break;
2541         case 1:
2542                 /* Increase starting rate, update uCode's rate table */
2543                 if (high != IWL_RATE_INVALID) {
2544                         update_lq = 1;
2545                         index = high;
2546                 }
2547
2548                 break;
2549         case 0:
2550                 /* No change */
2551         default:
2552                 break;
2553         }
2554
2555         IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2556                     "high %d type %d\n",
2557                      index, scale_action, low, high, tbl->lq_type);
2558
2559 lq_update:
2560         /* Replace uCode's rate table for the destination station. */
2561         if (update_lq)
2562                 rs_update_rate_tbl(priv, ctx, lq_sta, tbl, index, is_green);
2563
2564         if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
2565                 /* Should we stay with this modulation mode,
2566                  * or search for a new one? */
2567           rs_stay_in_table(lq_sta, false);
2568         }
2569         /*
2570          * Search for new modulation mode if we're:
2571          * 1)  Not changing rates right now
2572          * 2)  Not just finishing up a search
2573          * 3)  Allowing a new search
2574          */
2575         if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2576                 /* Save current throughput to compare with "search" throughput*/
2577                 lq_sta->last_tpt = current_tpt;
2578
2579                 /* Select a new "search" modulation mode to try.
2580                  * If one is found, set up the new "search" table. */
2581                 if (is_legacy(tbl->lq_type))
2582                         rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2583                 else if (is_siso(tbl->lq_type))
2584                         rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2585                 else if (is_mimo2(tbl->lq_type))
2586                         rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2587                 else
2588                         rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2589
2590                 /* If new "search" mode was selected, set up in uCode table */
2591                 if (lq_sta->search_better_tbl) {
2592                         /* Access the "search" table, clear its history. */
2593                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2594                         for (i = 0; i < IWL_RATE_COUNT; i++)
2595                                 rs_rate_scale_clear_window(&(tbl->win[i]));
2596
2597                         /* Use new "search" start rate */
2598                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2599
2600                         IWL_DEBUG_RATE(priv, "Switch current  mcs: %X index: %d\n",
2601                                      tbl->current_rate, index);
2602                         rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2603                         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2604                 } else
2605                         done_search = 1;
2606         }
2607
2608         if (done_search && !lq_sta->stay_in_tbl) {
2609                 /* If the "active" (non-search) mode was legacy,
2610                  * and we've tried switching antennas,
2611                  * but we haven't been able to try HT modes (not available),
2612                  * stay with best antenna legacy modulation for a while
2613                  * before next round of mode comparisons. */
2614                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2615                 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2616                     lq_sta->action_counter > tbl1->max_search) {
2617                         IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2618                         rs_set_stay_in_table(priv, 1, lq_sta);
2619                 }
2620
2621                 /* If we're in an HT mode, and all 3 mode switch actions
2622                  * have been tried and compared, stay in this best modulation
2623                  * mode for a while before next round of mode comparisons. */
2624                 if (lq_sta->enable_counter &&
2625                     (lq_sta->action_counter >= tbl1->max_search) &&
2626                     iwl_ht_enabled(priv)) {
2627                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2628                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2629                             (tid != IWL_MAX_TID_COUNT)) {
2630                                 u8 sta_id = lq_sta->lq.sta_id;
2631                                 tid_data = &priv->tid_data[sta_id][tid];
2632                                 if (tid_data->agg.state == IWL_AGG_OFF) {
2633                                         IWL_DEBUG_RATE(priv,
2634                                                        "try to aggregate tid %d\n",
2635                                                        tid);
2636                                         rs_tl_turn_on_agg(priv, tid,
2637                                                           lq_sta, sta);
2638                                 }
2639                         }
2640                         rs_set_stay_in_table(priv, 0, lq_sta);
2641                 }
2642         }
2643
2644 out:
2645         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2646         lq_sta->last_txrate_idx = index;
2647 }
2648
2649 /**
2650  * rs_initialize_lq - Initialize a station's hardware rate table
2651  *
2652  * The uCode's station table contains a table of fallback rates
2653  * for automatic fallback during transmission.
2654  *
2655  * NOTE: This sets up a default set of values.  These will be replaced later
2656  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2657  *       rc80211_simple.
2658  *
2659  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2660  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2661  *       which requires station table entry to exist).
2662  */
2663 static void rs_initialize_lq(struct iwl_priv *priv,
2664                              struct ieee80211_sta *sta,
2665                              struct iwl_lq_sta *lq_sta)
2666 {
2667         struct iwl_scale_tbl_info *tbl;
2668         int rate_idx;
2669         int i;
2670         u32 rate;
2671         u8 use_green = rs_use_green(sta);
2672         u8 active_tbl = 0;
2673         u8 valid_tx_ant;
2674         struct iwl_station_priv *sta_priv;
2675         struct iwl_rxon_context *ctx;
2676
2677         if (!sta || !lq_sta)
2678                 return;
2679
2680         sta_priv = (void *)sta->drv_priv;
2681         ctx = sta_priv->ctx;
2682
2683         i = lq_sta->last_txrate_idx;
2684
2685         valid_tx_ant = priv->nvm_data->valid_tx_ant;
2686
2687         if (!lq_sta->search_better_tbl)
2688                 active_tbl = lq_sta->active_tbl;
2689         else
2690                 active_tbl = 1 - lq_sta->active_tbl;
2691
2692         tbl = &(lq_sta->lq_info[active_tbl]);
2693
2694         if ((i < 0) || (i >= IWL_RATE_COUNT))
2695                 i = 0;
2696
2697         rate = iwl_rates[i].plcp;
2698         tbl->ant_type = first_antenna(valid_tx_ant);
2699         rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2700
2701         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2702                 rate |= RATE_MCS_CCK_MSK;
2703
2704         rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2705         if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2706             rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2707
2708         rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2709         tbl->current_rate = rate;
2710         rs_set_expected_tpt_table(lq_sta, tbl);
2711         rs_fill_link_cmd(NULL, lq_sta, rate);
2712         priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2713         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_SYNC, true);
2714 }
2715
2716 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2717                         struct ieee80211_tx_rate_control *txrc)
2718 {
2719
2720         struct sk_buff *skb = txrc->skb;
2721         struct ieee80211_supported_band *sband = txrc->sband;
2722         struct iwl_op_mode *op_mode __maybe_unused =
2723                         (struct iwl_op_mode *)priv_r;
2724         struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
2725         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2726         struct iwl_lq_sta *lq_sta = priv_sta;
2727         int rate_idx;
2728
2729         IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2730
2731         /* Get max rate if user set max rate */
2732         if (lq_sta) {
2733                 lq_sta->max_rate_idx = txrc->max_rate_idx;
2734                 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2735                     (lq_sta->max_rate_idx != -1))
2736                         lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2737                 if ((lq_sta->max_rate_idx < 0) ||
2738                     (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2739                         lq_sta->max_rate_idx = -1;
2740         }
2741
2742         /* Treat uninitialized rate scaling data same as non-existing. */
2743         if (lq_sta && !lq_sta->drv) {
2744                 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
2745                 priv_sta = NULL;
2746         }
2747
2748         /* Send management frames and NO_ACK data using lowest rate. */
2749         if (rate_control_send_low(sta, priv_sta, txrc))
2750                 return;
2751
2752         rate_idx  = lq_sta->last_txrate_idx;
2753
2754         if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2755                 rate_idx -= IWL_FIRST_OFDM_RATE;
2756                 /* 6M and 9M shared same MCS index */
2757                 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2758                 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2759                     IWL_RATE_MIMO3_6M_PLCP)
2760                         rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2761                 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2762                          IWL_RATE_MIMO2_6M_PLCP)
2763                         rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2764                 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2765                 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2766                         info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2767                 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2768                         info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
2769                 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2770                         info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2771                 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2772                         info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2773         } else {
2774                 /* Check for invalid rates */
2775                 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2776                                 ((sband->band == IEEE80211_BAND_5GHZ) &&
2777                                  (rate_idx < IWL_FIRST_OFDM_RATE)))
2778                         rate_idx = rate_lowest_index(sband, sta);
2779                 /* On valid 5 GHz rate, adjust index */
2780                 else if (sband->band == IEEE80211_BAND_5GHZ)
2781                         rate_idx -= IWL_FIRST_OFDM_RATE;
2782                 info->control.rates[0].flags = 0;
2783         }
2784         info->control.rates[0].idx = rate_idx;
2785         info->control.rates[0].count = 1;
2786 }
2787
2788 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2789                           gfp_t gfp)
2790 {
2791         struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2792         struct iwl_op_mode *op_mode __maybe_unused =
2793                         (struct iwl_op_mode *)priv_rate;
2794         struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
2795
2796         IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2797
2798         return &sta_priv->lq_sta;
2799 }
2800
2801 /*
2802  * Called after adding a new station to initialize rate scaling
2803  */
2804 void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id)
2805 {
2806         int i, j;
2807         struct ieee80211_hw *hw = priv->hw;
2808         struct ieee80211_conf *conf = &priv->hw->conf;
2809         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2810         struct iwl_station_priv *sta_priv;
2811         struct iwl_lq_sta *lq_sta;
2812         struct ieee80211_supported_band *sband;
2813         unsigned long supp; /* must be unsigned long for for_each_set_bit */
2814
2815         sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2816         lq_sta = &sta_priv->lq_sta;
2817         sband = hw->wiphy->bands[conf->chandef.chan->band];
2818
2819
2820         lq_sta->lq.sta_id = sta_id;
2821
2822         for (j = 0; j < LQ_SIZE; j++)
2823                 for (i = 0; i < IWL_RATE_COUNT; i++)
2824                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2825
2826         lq_sta->flush_timer = 0;
2827         lq_sta->supp_rates = sta->supp_rates[sband->band];
2828
2829         IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n",
2830                        sta_id);
2831         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2832          * the lowest or the highest rate.. Could consider using RSSI from
2833          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2834          * after assoc.. */
2835
2836         lq_sta->is_dup = 0;
2837         lq_sta->max_rate_idx = -1;
2838         lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2839         lq_sta->is_green = rs_use_green(sta);
2840         lq_sta->band = sband->band;
2841         /*
2842          * active legacy rates as per supported rates bitmap
2843          */
2844         supp = sta->supp_rates[sband->band];
2845         lq_sta->active_legacy_rate = 0;
2846         for_each_set_bit(i, &supp, BITS_PER_LONG)
2847                 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2848
2849         /*
2850          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2851          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2852          */
2853         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2854         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2855         lq_sta->active_siso_rate &= ~((u16)0x2);
2856         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2857
2858         /* Same here */
2859         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2860         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2861         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2862         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2863
2864         lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2865         lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2866         lq_sta->active_mimo3_rate &= ~((u16)0x2);
2867         lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2868
2869         IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2870                      lq_sta->active_siso_rate,
2871                      lq_sta->active_mimo2_rate,
2872                      lq_sta->active_mimo3_rate);
2873
2874         /* These values will be overridden later */
2875         lq_sta->lq.general_params.single_stream_ant_msk =
2876                 first_antenna(priv->nvm_data->valid_tx_ant);
2877         lq_sta->lq.general_params.dual_stream_ant_msk =
2878                 priv->nvm_data->valid_tx_ant &
2879                 ~first_antenna(priv->nvm_data->valid_tx_ant);
2880         if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2881                 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2882         } else if (num_of_ant(priv->nvm_data->valid_tx_ant) == 2) {
2883                 lq_sta->lq.general_params.dual_stream_ant_msk =
2884                         priv->nvm_data->valid_tx_ant;
2885         }
2886
2887         /* as default allow aggregation for all tids */
2888         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2889         lq_sta->drv = priv;
2890
2891         /* Set last_txrate_idx to lowest rate */
2892         lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2893         if (sband->band == IEEE80211_BAND_5GHZ)
2894                 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2895         lq_sta->is_agg = 0;
2896 #ifdef CONFIG_MAC80211_DEBUGFS
2897         lq_sta->dbg_fixed_rate = 0;
2898 #endif
2899
2900         rs_initialize_lq(priv, sta, lq_sta);
2901 }
2902
2903 static void rs_fill_link_cmd(struct iwl_priv *priv,
2904                              struct iwl_lq_sta *lq_sta, u32 new_rate)
2905 {
2906         struct iwl_scale_tbl_info tbl_type;
2907         int index = 0;
2908         int rate_idx;
2909         int repeat_rate = 0;
2910         u8 ant_toggle_cnt = 0;
2911         u8 use_ht_possible = 1;
2912         u8 valid_tx_ant = 0;
2913         struct iwl_station_priv *sta_priv =
2914                 container_of(lq_sta, struct iwl_station_priv, lq_sta);
2915         struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2916
2917         /* Override starting rate (index 0) if needed for debug purposes */
2918         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2919
2920         /* Interpret new_rate (rate_n_flags) */
2921         rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2922                                   &tbl_type, &rate_idx);
2923
2924         if (priv && priv->bt_full_concurrent) {
2925                 /* 1x1 only */
2926                 tbl_type.ant_type =
2927                         first_antenna(priv->nvm_data->valid_tx_ant);
2928         }
2929
2930         /* How many times should we repeat the initial rate? */
2931         if (is_legacy(tbl_type.lq_type)) {
2932                 ant_toggle_cnt = 1;
2933                 repeat_rate = IWL_NUMBER_TRY;
2934         } else {
2935                 repeat_rate = min(IWL_HT_NUMBER_TRY,
2936                                   LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2937         }
2938
2939         lq_cmd->general_params.mimo_delimiter =
2940                         is_mimo(tbl_type.lq_type) ? 1 : 0;
2941
2942         /* Fill 1st table entry (index 0) */
2943         lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2944
2945         if (num_of_ant(tbl_type.ant_type) == 1) {
2946                 lq_cmd->general_params.single_stream_ant_msk =
2947                                                 tbl_type.ant_type;
2948         } else if (num_of_ant(tbl_type.ant_type) == 2) {
2949                 lq_cmd->general_params.dual_stream_ant_msk =
2950                                                 tbl_type.ant_type;
2951         } /* otherwise we don't modify the existing value */
2952
2953         index++;
2954         repeat_rate--;
2955         if (priv) {
2956                 if (priv->bt_full_concurrent)
2957                         valid_tx_ant = ANT_A;
2958                 else
2959                         valid_tx_ant = priv->nvm_data->valid_tx_ant;
2960         }
2961
2962         /* Fill rest of rate table */
2963         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2964                 /* Repeat initial/next rate.
2965                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2966                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2967                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2968                         if (is_legacy(tbl_type.lq_type)) {
2969                                 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2970                                         ant_toggle_cnt++;
2971                                 else if (priv &&
2972                                          rs_toggle_antenna(valid_tx_ant,
2973                                                         &new_rate, &tbl_type))
2974                                         ant_toggle_cnt = 1;
2975                         }
2976
2977                         /* Override next rate if needed for debug purposes */
2978                         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2979
2980                         /* Fill next table entry */
2981                         lq_cmd->rs_table[index].rate_n_flags =
2982                                         cpu_to_le32(new_rate);
2983                         repeat_rate--;
2984                         index++;
2985                 }
2986
2987                 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2988                                                 &rate_idx);
2989
2990                 if (priv && priv->bt_full_concurrent) {
2991                         /* 1x1 only */
2992                         tbl_type.ant_type =
2993                             first_antenna(priv->nvm_data->valid_tx_ant);
2994                 }
2995
2996                 /* Indicate to uCode which entries might be MIMO.
2997                  * If initial rate was MIMO, this will finally end up
2998                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2999                 if (is_mimo(tbl_type.lq_type))
3000                         lq_cmd->general_params.mimo_delimiter = index;
3001
3002                 /* Get next rate */
3003                 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
3004                                              use_ht_possible);
3005
3006                 /* How many times should we repeat the next rate? */
3007                 if (is_legacy(tbl_type.lq_type)) {
3008                         if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
3009                                 ant_toggle_cnt++;
3010                         else if (priv &&
3011                                  rs_toggle_antenna(valid_tx_ant,
3012                                                    &new_rate, &tbl_type))
3013                                 ant_toggle_cnt = 1;
3014
3015                         repeat_rate = IWL_NUMBER_TRY;
3016                 } else {
3017                         repeat_rate = IWL_HT_NUMBER_TRY;
3018                 }
3019
3020                 /* Don't allow HT rates after next pass.
3021                  * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
3022                 use_ht_possible = 0;
3023
3024                 /* Override next rate if needed for debug purposes */
3025                 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
3026
3027                 /* Fill next table entry */
3028                 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
3029
3030                 index++;
3031                 repeat_rate--;
3032         }
3033
3034         lq_cmd->agg_params.agg_frame_cnt_limit =
3035                 sta_priv->max_agg_bufsize ?: LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3036         lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
3037
3038         lq_cmd->agg_params.agg_time_limit =
3039                 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
3040         /*
3041          * overwrite if needed, pass aggregation time limit
3042          * to uCode in uSec
3043          */
3044         if (priv && priv->lib->bt_params &&
3045             priv->lib->bt_params->agg_time_limit &&
3046             priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH)
3047                 lq_cmd->agg_params.agg_time_limit =
3048                         cpu_to_le16(priv->lib->bt_params->agg_time_limit);
3049 }
3050
3051 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3052 {
3053         return hw->priv;
3054 }
3055 /* rate scale requires free function to be implemented */
3056 static void rs_free(void *priv_rate)
3057 {
3058         return;
3059 }
3060
3061 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
3062                         void *priv_sta)
3063 {
3064         struct iwl_op_mode *op_mode __maybe_unused = priv_r;
3065         struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
3066
3067         IWL_DEBUG_RATE(priv, "enter\n");
3068         IWL_DEBUG_RATE(priv, "leave\n");
3069 }
3070
3071 #ifdef CONFIG_MAC80211_DEBUGFS
3072 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
3073                              u32 *rate_n_flags, int index)
3074 {
3075         struct iwl_priv *priv;
3076         u8 valid_tx_ant;
3077         u8 ant_sel_tx;
3078
3079         priv = lq_sta->drv;
3080         valid_tx_ant = priv->nvm_data->valid_tx_ant;
3081         if (lq_sta->dbg_fixed_rate) {
3082                 ant_sel_tx =
3083                   ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
3084                   >> RATE_MCS_ANT_POS);
3085                 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
3086                         *rate_n_flags = lq_sta->dbg_fixed_rate;
3087                         IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
3088                 } else {
3089                         lq_sta->dbg_fixed_rate = 0;
3090                         IWL_ERR(priv,
3091                             "Invalid antenna selection 0x%X, Valid is 0x%X\n",
3092                             ant_sel_tx, valid_tx_ant);
3093                         IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3094                 }
3095         } else {
3096                 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3097         }
3098 }
3099
3100 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3101                         const char __user *user_buf, size_t count, loff_t *ppos)
3102 {
3103         struct iwl_lq_sta *lq_sta = file->private_data;
3104         struct iwl_priv *priv;
3105         char buf[64];
3106         size_t buf_size;
3107         u32 parsed_rate;
3108
3109
3110         priv = lq_sta->drv;
3111         memset(buf, 0, sizeof(buf));
3112         buf_size = min(count, sizeof(buf) -  1);
3113         if (copy_from_user(buf, user_buf, buf_size))
3114                 return -EFAULT;
3115
3116         if (sscanf(buf, "%x", &parsed_rate) == 1)
3117                 lq_sta->dbg_fixed_rate = parsed_rate;
3118         else
3119                 lq_sta->dbg_fixed_rate = 0;
3120
3121         rs_program_fix_rate(priv, lq_sta);
3122
3123         return count;
3124 }
3125
3126 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3127                         char __user *user_buf, size_t count, loff_t *ppos)
3128 {
3129         char *buff;
3130         int desc = 0;
3131         int i = 0;
3132         int index = 0;
3133         ssize_t ret;
3134
3135         struct iwl_lq_sta *lq_sta = file->private_data;
3136         struct iwl_priv *priv;
3137         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3138
3139         priv = lq_sta->drv;
3140         buff = kmalloc(1024, GFP_KERNEL);
3141         if (!buff)
3142                 return -ENOMEM;
3143
3144         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3145         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
3146                         lq_sta->total_failed, lq_sta->total_success,
3147                         lq_sta->active_legacy_rate);
3148         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3149                         lq_sta->dbg_fixed_rate);
3150         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3151             (priv->nvm_data->valid_tx_ant & ANT_A) ? "ANT_A," : "",
3152             (priv->nvm_data->valid_tx_ant & ANT_B) ? "ANT_B," : "",
3153             (priv->nvm_data->valid_tx_ant & ANT_C) ? "ANT_C" : "");
3154         desc += sprintf(buff+desc, "lq type %s\n",
3155            (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
3156         if (is_Ht(tbl->lq_type)) {
3157                 desc += sprintf(buff+desc, " %s",
3158                    (is_siso(tbl->lq_type)) ? "SISO" :
3159                    ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
3160                    desc += sprintf(buff+desc, " %s",
3161                    (tbl->is_ht40) ? "40MHz" : "20MHz");
3162                    desc += sprintf(buff+desc, " %s %s %s\n", (tbl->is_SGI) ? "SGI" : "",
3163                    (lq_sta->is_green) ? "GF enabled" : "",
3164                    (lq_sta->is_agg) ? "AGG on" : "");
3165         }
3166         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3167                 lq_sta->last_rate_n_flags);
3168         desc += sprintf(buff+desc, "general:"
3169                 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
3170                 lq_sta->lq.general_params.flags,
3171                 lq_sta->lq.general_params.mimo_delimiter,
3172                 lq_sta->lq.general_params.single_stream_ant_msk,
3173                 lq_sta->lq.general_params.dual_stream_ant_msk);
3174
3175         desc += sprintf(buff+desc, "agg:"
3176                         "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3177                         le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
3178                         lq_sta->lq.agg_params.agg_dis_start_th,
3179                         lq_sta->lq.agg_params.agg_frame_cnt_limit);
3180
3181         desc += sprintf(buff+desc,
3182                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3183                         lq_sta->lq.general_params.start_rate_index[0],
3184                         lq_sta->lq.general_params.start_rate_index[1],
3185                         lq_sta->lq.general_params.start_rate_index[2],
3186                         lq_sta->lq.general_params.start_rate_index[3]);
3187
3188         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3189                 index = iwl_hwrate_to_plcp_idx(
3190                         le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
3191                 if (is_legacy(tbl->lq_type)) {
3192                         desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
3193                                 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3194                                 iwl_rate_mcs[index].mbps);
3195                 } else {
3196                         desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
3197                                 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3198                                 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
3199                 }
3200         }
3201
3202         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3203         kfree(buff);
3204         return ret;
3205 }
3206
3207 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3208         .write = rs_sta_dbgfs_scale_table_write,
3209         .read = rs_sta_dbgfs_scale_table_read,
3210         .open = simple_open,
3211         .llseek = default_llseek,
3212 };
3213 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3214                         char __user *user_buf, size_t count, loff_t *ppos)
3215 {
3216         char *buff;
3217         int desc = 0;
3218         int i, j;
3219         ssize_t ret;
3220
3221         struct iwl_lq_sta *lq_sta = file->private_data;
3222
3223         buff = kmalloc(1024, GFP_KERNEL);
3224         if (!buff)
3225                 return -ENOMEM;
3226
3227         for (i = 0; i < LQ_SIZE; i++) {
3228                 desc += sprintf(buff+desc,
3229                                 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
3230                                 "rate=0x%X\n",
3231                                 lq_sta->active_tbl == i ? "*" : "x",
3232                                 lq_sta->lq_info[i].lq_type,
3233                                 lq_sta->lq_info[i].is_SGI,
3234                                 lq_sta->lq_info[i].is_ht40,
3235                                 lq_sta->lq_info[i].is_dup,
3236                                 lq_sta->is_green,
3237                                 lq_sta->lq_info[i].current_rate);
3238                 for (j = 0; j < IWL_RATE_COUNT; j++) {
3239                         desc += sprintf(buff+desc,
3240                                 "counter=%d success=%d %%=%d\n",
3241                                 lq_sta->lq_info[i].win[j].counter,
3242                                 lq_sta->lq_info[i].win[j].success_counter,
3243                                 lq_sta->lq_info[i].win[j].success_ratio);
3244                 }
3245         }
3246         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3247         kfree(buff);
3248         return ret;
3249 }
3250
3251 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3252         .read = rs_sta_dbgfs_stats_table_read,
3253         .open = simple_open,
3254         .llseek = default_llseek,
3255 };
3256
3257 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3258                         char __user *user_buf, size_t count, loff_t *ppos)
3259 {
3260         struct iwl_lq_sta *lq_sta = file->private_data;
3261         struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3262         char buff[120];
3263         int desc = 0;
3264
3265         if (is_Ht(tbl->lq_type))
3266                 desc += sprintf(buff+desc,
3267                                 "Bit Rate= %d Mb/s\n",
3268                                 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3269         else
3270                 desc += sprintf(buff+desc,
3271                                 "Bit Rate= %d Mb/s\n",
3272                                 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3273
3274         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3275 }
3276
3277 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3278         .read = rs_sta_dbgfs_rate_scale_data_read,
3279         .open = simple_open,
3280         .llseek = default_llseek,
3281 };
3282
3283 static void rs_add_debugfs(void *priv, void *priv_sta,
3284                                         struct dentry *dir)
3285 {
3286         struct iwl_lq_sta *lq_sta = priv_sta;
3287         lq_sta->rs_sta_dbgfs_scale_table_file =
3288                 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3289                                 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3290         lq_sta->rs_sta_dbgfs_stats_table_file =
3291                 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3292                         lq_sta, &rs_sta_dbgfs_stats_table_ops);
3293         lq_sta->rs_sta_dbgfs_rate_scale_data_file =
3294                 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
3295                         lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
3296         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
3297                 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3298                 &lq_sta->tx_agg_tid_en);
3299
3300 }
3301
3302 static void rs_remove_debugfs(void *priv, void *priv_sta)
3303 {
3304         struct iwl_lq_sta *lq_sta = priv_sta;
3305         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3306         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
3307         debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
3308         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
3309 }
3310 #endif
3311
3312 /*
3313  * Initialization of rate scaling information is done by driver after
3314  * the station is added. Since mac80211 calls this function before a
3315  * station is added we ignore it.
3316  */
3317 static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband,
3318                               struct cfg80211_chan_def *chandef,
3319                               struct ieee80211_sta *sta, void *priv_sta)
3320 {
3321 }
3322 static struct rate_control_ops rs_ops = {
3323         .module = NULL,
3324         .name = RS_NAME,
3325         .tx_status = rs_tx_status,
3326         .get_rate = rs_get_rate,
3327         .rate_init = rs_rate_init_stub,
3328         .alloc = rs_alloc,
3329         .free = rs_free,
3330         .alloc_sta = rs_alloc_sta,
3331         .free_sta = rs_free_sta,
3332 #ifdef CONFIG_MAC80211_DEBUGFS
3333         .add_sta_debugfs = rs_add_debugfs,
3334         .remove_sta_debugfs = rs_remove_debugfs,
3335 #endif
3336 };
3337
3338 int iwlagn_rate_control_register(void)
3339 {
3340         return ieee80211_rate_control_register(&rs_ops);
3341 }
3342
3343 void iwlagn_rate_control_unregister(void)
3344 {
3345         ieee80211_rate_control_unregister(&rs_ops);
3346 }
3347