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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2011 Intel Corporation. All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  * Contact Information:
  22  *  Intel Linux Wireless <ilw@linux.intel.com>
  23  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  24  *
  25  *****************************************************************************/
  26 #include <linux/kernel.h>
  27 #include <linux/init.h>
  28 #include <linux/skbuff.h>
  29 #include <linux/slab.h>
  30 #include <net/mac80211.h>
  31
  32 #include <linux/netdevice.h>
  33 #include <linux/etherdevice.h>
  34 #include <linux/delay.h>
  35
  36 #include <linux/workqueue.h>
  37
  38 #include "iwl-dev.h"
  39 #include "iwl-sta.h"
  40 #include "iwl-core.h"
  41 #include "iwl-agn.h"
  42
  43 #define RS_NAME "iwl-agn-rs"
  44
  45 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
  46 #define IWL_NUMBER_TRY      1
  47 #define IWL_HT_NUMBER_TRY   3
  48
  49 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  50 #define IWL_RATE_MIN_FAILURE_TH         6       /* min failures to calc tpt */
  51 #define IWL_RATE_MIN_SUCCESS_TH         8       /* min successes to calc tpt */
  52
  53 /* max allowed rate miss before sync LQ cmd */
  54 #define IWL_MISSED_RATE_MAX             15
  55 /* max time to accum history 2 seconds */
  56 #define IWL_RATE_SCALE_FLUSH_INTVL   (3*HZ)
  57
  58 static u8 rs_ht_to_legacy[] = {
  59         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  60         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  61         IWL_RATE_6M_INDEX,
  62         IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
  63         IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
  64         IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
  65         IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
  66 };
  67
  68 static const u8 ant_toggle_lookup[] = {
  69         /*ANT_NONE -> */ ANT_NONE,
  70         /*ANT_A    -> */ ANT_B,
  71         /*ANT_B    -> */ ANT_C,
  72         /*ANT_AB   -> */ ANT_BC,
  73         /*ANT_C    -> */ ANT_A,
  74         /*ANT_AC   -> */ ANT_AB,
  75         /*ANT_BC   -> */ ANT_AC,
  76         /*ANT_ABC  -> */ ANT_ABC,
  77 };
  78
  79 #define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np)    \
  80         [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,      \
  81                                     IWL_RATE_SISO_##s##M_PLCP, \
  82                                     IWL_RATE_MIMO2_##s##M_PLCP,\
  83                                     IWL_RATE_MIMO3_##s##M_PLCP,\
  84                                     IWL_RATE_##r##M_IEEE,      \
  85                                     IWL_RATE_##ip##M_INDEX,    \
  86                                     IWL_RATE_##in##M_INDEX,    \
  87                                     IWL_RATE_##rp##M_INDEX,    \
  88                                     IWL_RATE_##rn##M_INDEX,    \
  89                                     IWL_RATE_##pp##M_INDEX,    \
  90                                     IWL_RATE_##np##M_INDEX }
  91
  92 /*
  93  * Parameter order:
  94  *   rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
  95  *
  96  * If there isn't a valid next or previous rate then INV is used which
  97  * maps to IWL_RATE_INVALID
  98  *
  99  */
 100 const struct iwl_rate_info iwl_rates[IWL_RATE_COUNT] = {
 101         IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2),    /*  1mbps */
 102         IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5),          /*  2mbps */
 103         IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11),        /*5.5mbps */
 104         IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18),      /* 11mbps */
 105         IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11),        /*  6mbps */
 106         IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11),       /*  9mbps */
 107         IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18),   /* 12mbps */
 108         IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24),   /* 18mbps */
 109         IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36),   /* 24mbps */
 110         IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48),   /* 36mbps */
 111         IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54),   /* 48mbps */
 112         IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
 113         IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
 114         /* FIXME:RS:          ^^    should be INV (legacy) */
 115 };
 116
 117 static inline u8 rs_extract_rate(u32 rate_n_flags)
 118 {
 119         return (u8)(rate_n_flags & RATE_MCS_RATE_MSK);
 120 }
 121
 122 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
 123 {
 124         int idx = 0;
 125
 126         /* HT rate format */
 127         if (rate_n_flags & RATE_MCS_HT_MSK) {
 128                 idx = rs_extract_rate(rate_n_flags);
 129
 130                 if (idx >= IWL_RATE_MIMO3_6M_PLCP)
 131                         idx = idx - IWL_RATE_MIMO3_6M_PLCP;
 132                 else if (idx >= IWL_RATE_MIMO2_6M_PLCP)
 133                         idx = idx - IWL_RATE_MIMO2_6M_PLCP;
 134
 135                 idx += IWL_FIRST_OFDM_RATE;
 136                 /* skip 9M not supported in ht*/
 137                 if (idx >= IWL_RATE_9M_INDEX)
 138                         idx += 1;
 139                 if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE))
 140                         return idx;
 141
 142         /* legacy rate format, search for match in table */
 143         } else {
 144                 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
 145                         if (iwl_rates[idx].plcp ==
 146                                         rs_extract_rate(rate_n_flags))
 147                                 return idx;
 148         }
 149
 150         return -1;
 151 }
 152
 153 static void rs_rate_scale_perform(struct iwl_priv *priv,
 154                                    struct sk_buff *skb,
 155                                    struct ieee80211_sta *sta,
 156                                    struct iwl_lq_sta *lq_sta);
 157 static void rs_fill_link_cmd(struct iwl_priv *priv,
 158                              struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
 159 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
 160
 161
 162 #ifdef CONFIG_MAC80211_DEBUGFS
 163 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 164                              u32 *rate_n_flags, int index);
 165 #else
 166 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 167                              u32 *rate_n_flags, int index)
 168 {}
 169 #endif
 170
 171 /**
 172  * The following tables contain the expected throughput metrics for all rates
 173  *
 174  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 175  *
 176  * where invalid entries are zeros.
 177  *
 178  * CCK rates are only valid in legacy table and will only be used in G
 179  * (2.4 GHz) band.
 180  */
 181
 182 static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
 183         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
 184 };
 185
 186 static s32 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
 187         {0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202}, /* Norm */
 188         {0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210}, /* SGI */
 189         {0, 0, 0, 0, 47, 0,  91, 133, 171, 242, 305, 334, 362}, /* AGG */
 190         {0, 0, 0, 0, 52, 0, 101, 145, 187, 264, 330, 361, 390}, /* AGG+SGI */
 191 };
 192
 193 static s32 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
 194         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
 195         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
 196         {0, 0, 0, 0,  94, 0, 177, 249, 313, 423, 512, 550, 586}, /* AGG */
 197         {0, 0, 0, 0, 104, 0, 193, 270, 338, 454, 545, 584, 620}, /* AGG+SGI */
 198 };
 199
 200 static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 201         {0, 0, 0, 0,  74, 0, 123, 155, 179, 214, 236, 244, 251}, /* Norm */
 202         {0, 0, 0, 0,  81, 0, 131, 164, 188, 223, 243, 251, 257}, /* SGI */
 203         {0, 0, 0, 0,  89, 0, 167, 235, 296, 402, 488, 526, 560}, /* AGG */
 204         {0, 0, 0, 0,  97, 0, 182, 255, 320, 431, 520, 558, 593}, /* AGG+SGI*/
 205 };
 206
 207 static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 208         {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
 209         {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
 210         {0, 0, 0, 0, 171, 0, 305, 410, 496, 634, 731, 771, 805}, /* AGG */
 211         {0, 0, 0, 0, 186, 0, 329, 439, 527, 667, 764, 803, 838}, /* AGG+SGI */
 212 };
 213
 214 static s32 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = {
 215         {0, 0, 0, 0,  99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */
 216         {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */
 217         {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */
 218         {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */
 219 };
 220
 221 static s32 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = {
 222         {0, 0, 0, 0, 152, 0, 211, 239, 255, 279,  290,  294,  297}, /* Norm */
 223         {0, 0, 0, 0, 160, 0, 219, 245, 261, 284,  294,  297,  300}, /* SGI */
 224         {0, 0, 0, 0, 254, 0, 443, 584, 695, 868,  984, 1030, 1070}, /* AGG */
 225         {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */
 226 };
 227
 228 /* mbps, mcs */
 229 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 230         {  "1", "BPSK DSSS"},
 231         {  "2", "QPSK DSSS"},
 232         {"5.5", "BPSK CCK"},
 233         { "11", "QPSK CCK"},
 234         {  "6", "BPSK 1/2"},
 235         {  "9", "BPSK 1/2"},
 236         { "12", "QPSK 1/2"},
 237         { "18", "QPSK 3/4"},
 238         { "24", "16QAM 1/2"},
 239         { "36", "16QAM 3/4"},
 240         { "48", "64QAM 2/3"},
 241         { "54", "64QAM 3/4"},
 242         { "60", "64QAM 5/6"},
 243 };
 244
 245 #define MCS_INDEX_PER_STREAM    (8)
 246
 247 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 248 {
 249         window->data = 0;
 250         window->success_counter = 0;
 251         window->success_ratio = IWL_INVALID_VALUE;
 252         window->counter = 0;
 253         window->average_tpt = IWL_INVALID_VALUE;
 254         window->stamp = 0;
 255 }
 256
 257 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 258 {
 259         return (ant_type & valid_antenna) == ant_type;
 260 }
 261
 262 /*
 263  *      removes the old data from the statistics. All data that is older than
 264  *      TID_MAX_TIME_DIFF, will be deleted.
 265  */
 266 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
 267 {
 268         /* The oldest age we want to keep */
 269         u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
 270
 271         while (tl->queue_count &&
 272                (tl->time_stamp < oldest_time)) {
 273                 tl->total -= tl->packet_count[tl->head];
 274                 tl->packet_count[tl->head] = 0;
 275                 tl->time_stamp += TID_QUEUE_CELL_SPACING;
 276                 tl->queue_count--;
 277                 tl->head++;
 278                 if (tl->head >= TID_QUEUE_MAX_SIZE)
 279                         tl->head = 0;
 280         }
 281 }
 282
 283 /*
 284  *      increment traffic load value for tid and also remove
 285  *      any old values if passed the certain time period
 286  */
 287 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
 288                            struct ieee80211_hdr *hdr)
 289 {
 290         u32 curr_time = jiffies_to_msecs(jiffies);
 291         u32 time_diff;
 292         s32 index;
 293         struct iwl_traffic_load *tl = NULL;
 294         u8 tid;
 295
 296         if (ieee80211_is_data_qos(hdr->frame_control)) {
 297                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 298                 tid = qc[0] & 0xf;
 299         } else
 300                 return MAX_TID_COUNT;
 301
 302         if (unlikely(tid >= TID_MAX_LOAD_COUNT))
 303                 return MAX_TID_COUNT;
 304
 305         tl = &lq_data->load[tid];
 306
 307         curr_time -= curr_time % TID_ROUND_VALUE;
 308
 309         /* Happens only for the first packet. Initialize the data */
 310         if (!(tl->queue_count)) {
 311                 tl->total = 1;
 312                 tl->time_stamp = curr_time;
 313                 tl->queue_count = 1;
 314                 tl->head = 0;
 315                 tl->packet_count[0] = 1;
 316                 return MAX_TID_COUNT;
 317         }
 318
 319         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 320         index = time_diff / TID_QUEUE_CELL_SPACING;
 321
 322         /* The history is too long: remove data that is older than */
 323         /* TID_MAX_TIME_DIFF */
 324         if (index >= TID_QUEUE_MAX_SIZE)
 325                 rs_tl_rm_old_stats(tl, curr_time);
 326
 327         index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
 328         tl->packet_count[index] = tl->packet_count[index] + 1;
 329         tl->total = tl->total + 1;
 330
 331         if ((index + 1) > tl->queue_count)
 332                 tl->queue_count = index + 1;
 333
 334         return tid;
 335 }
 336
 337 #ifdef CONFIG_MAC80211_DEBUGFS
 338 /**
 339  * Program the device to use fixed rate for frame transmit
 340  * This is for debugging/testing only
 341  * once the device start use fixed rate, we need to reload the module
 342  * to being back the normal operation.
 343  */
 344 static void rs_program_fix_rate(struct iwl_priv *priv,
 345                                 struct iwl_lq_sta *lq_sta)
 346 {
 347         struct iwl_station_priv *sta_priv =
 348                 container_of(lq_sta, struct iwl_station_priv, lq_sta);
 349         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
 350
 351         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
 352         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 353         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 354         lq_sta->active_mimo3_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 355
 356 #ifdef CONFIG_IWLWIFI_DEVICE_SVTOOL
 357         /* testmode has higher priority to overwirte the fixed rate */
 358         if (priv->tm_fixed_rate)
 359                 lq_sta->dbg_fixed_rate = priv->tm_fixed_rate;
 360 #endif
 361
 362         IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
 363                 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
 364
 365         if (lq_sta->dbg_fixed_rate) {
 366                 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
 367                 iwl_send_lq_cmd(lq_sta->drv, ctx, &lq_sta->lq, CMD_ASYNC,
 368                                 false);
 369         }
 370 }
 371 #endif
 372
 373 /*
 374         get the traffic load value for tid
 375 */
 376 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
 377 {
 378         u32 curr_time = jiffies_to_msecs(jiffies);
 379         u32 time_diff;
 380         s32 index;
 381         struct iwl_traffic_load *tl = NULL;
 382
 383         if (tid >= TID_MAX_LOAD_COUNT)
 384                 return 0;
 385
 386         tl = &(lq_data->load[tid]);
 387
 388         curr_time -= curr_time % TID_ROUND_VALUE;
 389
 390         if (!(tl->queue_count))
 391                 return 0;
 392
 393         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 394         index = time_diff / TID_QUEUE_CELL_SPACING;
 395
 396         /* The history is too long: remove data that is older than */
 397         /* TID_MAX_TIME_DIFF */
 398         if (index >= TID_QUEUE_MAX_SIZE)
 399                 rs_tl_rm_old_stats(tl, curr_time);
 400
 401         return tl->total;
 402 }
 403
 404 static int rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
 405                                       struct iwl_lq_sta *lq_data, u8 tid,
 406                                       struct ieee80211_sta *sta)
 407 {
 408         int ret = -EAGAIN;
 409         u32 load;
 410
 411         /*
 412          * Don't create TX aggregation sessions when in high
 413          * BT traffic, as they would just be disrupted by BT.
 414          */
 415         if (priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) {
 416                 IWL_ERR(priv, "BT traffic (%d), no aggregation allowed\n",
 417                         priv->bt_traffic_load);
 418                 return ret;
 419         }
 420
 421         load = rs_tl_get_load(lq_data, tid);
 422
 423         if (load > IWL_AGG_LOAD_THRESHOLD) {
 424                 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
 425                                 sta->addr, tid);
 426                 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
 427                 if (ret == -EAGAIN) {
 428                         /*
 429                          * driver and mac80211 is out of sync
 430                          * this might be cause by reloading firmware
 431                          * stop the tx ba session here
 432                          */
 433                         IWL_ERR(priv, "Fail start Tx agg on tid: %d\n",
 434                                 tid);
 435                         ieee80211_stop_tx_ba_session(sta, tid);
 436                 }
 437         } else {
 438                 IWL_DEBUG_HT(priv, "Aggregation not enabled for tid %d "
 439                         "because load = %u\n", tid, load);
 440         }
 441         return ret;
 442 }
 443
 444 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
 445                               struct iwl_lq_sta *lq_data,
 446                               struct ieee80211_sta *sta)
 447 {
 448         if (tid < TID_MAX_LOAD_COUNT)
 449                 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 450         else
 451                 IWL_ERR(priv, "tid exceeds max load count: %d/%d\n",
 452                         tid, TID_MAX_LOAD_COUNT);
 453 }
 454
 455 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 456 {
 457         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 458                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 459                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 460 }
 461
 462 /*
 463  * Static function to get the expected throughput from an iwl_scale_tbl_info
 464  * that wraps a NULL pointer check
 465  */
 466 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 467 {
 468         if (tbl->expected_tpt)
 469                 return tbl->expected_tpt[rs_index];
 470         return 0;
 471 }
 472
 473 /**
 474  * rs_collect_tx_data - Update the success/failure sliding window
 475  *
 476  * We keep a sliding window of the last 62 packets transmitted
 477  * at this rate.  window->data contains the bitmask of successful
 478  * packets.
 479  */
 480 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
 481                               int scale_index, int attempts, int successes)
 482 {
 483         struct iwl_rate_scale_data *window = NULL;
 484         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 485         s32 fail_count, tpt;
 486
 487         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 488                 return -EINVAL;
 489
 490         /* Select window for current tx bit rate */
 491         window = &(tbl->win[scale_index]);
 492
 493         /* Get expected throughput */
 494         tpt = get_expected_tpt(tbl, scale_index);
 495
 496         /*
 497          * Keep track of only the latest 62 tx frame attempts in this rate's
 498          * history window; anything older isn't really relevant any more.
 499          * If we have filled up the sliding window, drop the oldest attempt;
 500          * if the oldest attempt (highest bit in bitmap) shows "success",
 501          * subtract "1" from the success counter (this is the main reason
 502          * we keep these bitmaps!).
 503          */
 504         while (attempts > 0) {
 505                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 506
 507                         /* remove earliest */
 508                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 509
 510                         if (window->data & mask) {
 511                                 window->data &= ~mask;
 512                                 window->success_counter--;
 513                         }
 514                 }
 515
 516                 /* Increment frames-attempted counter */
 517                 window->counter++;
 518
 519                 /* Shift bitmap by one frame to throw away oldest history */
 520                 window->data <<= 1;
 521
 522                 /* Mark the most recent #successes attempts as successful */
 523                 if (successes > 0) {
 524                         window->success_counter++;
 525                         window->data |= 0x1;
 526                         successes--;
 527                 }
 528
 529                 attempts--;
 530         }
 531
 532         /* Calculate current success ratio, avoid divide-by-0! */
 533         if (window->counter > 0)
 534                 window->success_ratio = 128 * (100 * window->success_counter)
 535                                         / window->counter;
 536         else
 537                 window->success_ratio = IWL_INVALID_VALUE;
 538
 539         fail_count = window->counter - window->success_counter;
 540
 541         /* Calculate average throughput, if we have enough history. */
 542         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 543             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 544                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 545         else
 546                 window->average_tpt = IWL_INVALID_VALUE;
 547
 548         /* Tag this window as having been updated */
 549         window->stamp = jiffies;
 550
 551         return 0;
 552 }
 553
 554 /*
 555  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
 556  */
 557 /* FIXME:RS:remove this function and put the flags statically in the table */
 558 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
 559                                  struct iwl_scale_tbl_info *tbl,
 560                                  int index, u8 use_green)
 561 {
 562         u32 rate_n_flags = 0;
 563
 564         if (is_legacy(tbl->lq_type)) {
 565                 rate_n_flags = iwl_rates[index].plcp;
 566                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 567                         rate_n_flags |= RATE_MCS_CCK_MSK;
 568
 569         } else if (is_Ht(tbl->lq_type)) {
 570                 if (index > IWL_LAST_OFDM_RATE) {
 571                         IWL_ERR(priv, "Invalid HT rate index %d\n", index);
 572                         index = IWL_LAST_OFDM_RATE;
 573                 }
 574                 rate_n_flags = RATE_MCS_HT_MSK;
 575
 576                 if (is_siso(tbl->lq_type))
 577                         rate_n_flags |= iwl_rates[index].plcp_siso;
 578                 else if (is_mimo2(tbl->lq_type))
 579                         rate_n_flags |= iwl_rates[index].plcp_mimo2;
 580                 else
 581                         rate_n_flags |= iwl_rates[index].plcp_mimo3;
 582         } else {
 583                 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
 584         }
 585
 586         rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
 587                                                      RATE_MCS_ANT_ABC_MSK);
 588
 589         if (is_Ht(tbl->lq_type)) {
 590                 if (tbl->is_ht40) {
 591                         if (tbl->is_dup)
 592                                 rate_n_flags |= RATE_MCS_DUP_MSK;
 593                         else
 594                                 rate_n_flags |= RATE_MCS_HT40_MSK;
 595                 }
 596                 if (tbl->is_SGI)
 597                         rate_n_flags |= RATE_MCS_SGI_MSK;
 598
 599                 if (use_green) {
 600                         rate_n_flags |= RATE_MCS_GF_MSK;
 601                         if (is_siso(tbl->lq_type) && tbl->is_SGI) {
 602                                 rate_n_flags &= ~RATE_MCS_SGI_MSK;
 603                                 IWL_ERR(priv, "GF was set with SGI:SISO\n");
 604                         }
 605                 }
 606         }
 607         return rate_n_flags;
 608 }
 609
 610 /*
 611  * Interpret uCode API's rate_n_flags format,
 612  * fill "search" or "active" tx mode table.
 613  */
 614 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
 615                                     enum ieee80211_band band,
 616                                     struct iwl_scale_tbl_info *tbl,
 617                                     int *rate_idx)
 618 {
 619         u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
 620         u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
 621         u8 mcs;
 622
 623         memset(tbl, 0, sizeof(struct iwl_scale_tbl_info));
 624         *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
 625
 626         if (*rate_idx  == IWL_RATE_INVALID) {
 627                 *rate_idx = -1;
 628                 return -EINVAL;
 629         }
 630         tbl->is_SGI = 0;        /* default legacy setup */
 631         tbl->is_ht40 = 0;
 632         tbl->is_dup = 0;
 633         tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
 634         tbl->lq_type = LQ_NONE;
 635         tbl->max_search = IWL_MAX_SEARCH;
 636
 637         /* legacy rate format */
 638         if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
 639                 if (num_of_ant == 1) {
 640                         if (band == IEEE80211_BAND_5GHZ)
 641                                 tbl->lq_type = LQ_A;
 642                         else
 643                                 tbl->lq_type = LQ_G;
 644                 }
 645         /* HT rate format */
 646         } else {
 647                 if (rate_n_flags & RATE_MCS_SGI_MSK)
 648                         tbl->is_SGI = 1;
 649
 650                 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
 651                     (rate_n_flags & RATE_MCS_DUP_MSK))
 652                         tbl->is_ht40 = 1;
 653
 654                 if (rate_n_flags & RATE_MCS_DUP_MSK)
 655                         tbl->is_dup = 1;
 656
 657                 mcs = rs_extract_rate(rate_n_flags);
 658
 659                 /* SISO */
 660                 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
 661                         if (num_of_ant == 1)
 662                                 tbl->lq_type = LQ_SISO; /*else NONE*/
 663                 /* MIMO2 */
 664                 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
 665                         if (num_of_ant == 2)
 666                                 tbl->lq_type = LQ_MIMO2;
 667                 /* MIMO3 */
 668                 } else {
 669                         if (num_of_ant == 3) {
 670                                 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
 671                                 tbl->lq_type = LQ_MIMO3;
 672                         }
 673                 }
 674         }
 675         return 0;
 676 }
 677
 678 /* switch to another antenna/antennas and return 1 */
 679 /* if no other valid antenna found, return 0 */
 680 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
 681                              struct iwl_scale_tbl_info *tbl)
 682 {
 683         u8 new_ant_type;
 684
 685         if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
 686                 return 0;
 687
 688         if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
 689                 return 0;
 690
 691         new_ant_type = ant_toggle_lookup[tbl->ant_type];
 692
 693         while ((new_ant_type != tbl->ant_type) &&
 694                !rs_is_valid_ant(valid_ant, new_ant_type))
 695                 new_ant_type = ant_toggle_lookup[new_ant_type];
 696
 697         if (new_ant_type == tbl->ant_type)
 698                 return 0;
 699
 700         tbl->ant_type = new_ant_type;
 701         *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
 702         *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
 703         return 1;
 704 }
 705
 706 /**
 707  * Green-field mode is valid if the station supports it and
 708  * there are no non-GF stations present in the BSS.
 709  */
 710 static bool rs_use_green(struct ieee80211_sta *sta)
 711 {
 712         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
 713         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
 714
 715         return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
 716                 !(ctx->ht.non_gf_sta_present);
 717 }
 718
 719 /**
 720  * rs_get_supported_rates - get the available rates
 721  *
 722  * if management frame or broadcast frame only return
 723  * basic available rates.
 724  *
 725  */
 726 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 727                                   struct ieee80211_hdr *hdr,
 728                                   enum iwl_table_type rate_type)
 729 {
 730         if (is_legacy(rate_type)) {
 731                 return lq_sta->active_legacy_rate;
 732         } else {
 733                 if (is_siso(rate_type))
 734                         return lq_sta->active_siso_rate;
 735                 else if (is_mimo2(rate_type))
 736                         return lq_sta->active_mimo2_rate;
 737                 else
 738                         return lq_sta->active_mimo3_rate;
 739         }
 740 }
 741
 742 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
 743                                 int rate_type)
 744 {
 745         u8 high = IWL_RATE_INVALID;
 746         u8 low = IWL_RATE_INVALID;
 747
 748         /* 802.11A or ht walks to the next literal adjacent rate in
 749          * the rate table */
 750         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 751                 int i;
 752                 u32 mask;
 753
 754                 /* Find the previous rate that is in the rate mask */
 755                 i = index - 1;
 756                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 757                         if (rate_mask & mask) {
 758                                 low = i;
 759                                 break;
 760                         }
 761                 }
 762
 763                 /* Find the next rate that is in the rate mask */
 764                 i = index + 1;
 765                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 766                         if (rate_mask & mask) {
 767                                 high = i;
 768                                 break;
 769                         }
 770                 }
 771
 772                 return (high << 8) | low;
 773         }
 774
 775         low = index;
 776         while (low != IWL_RATE_INVALID) {
 777                 low = iwl_rates[low].prev_rs;
 778                 if (low == IWL_RATE_INVALID)
 779                         break;
 780                 if (rate_mask & (1 << low))
 781                         break;
 782                 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
 783         }
 784
 785         high = index;
 786         while (high != IWL_RATE_INVALID) {
 787                 high = iwl_rates[high].next_rs;
 788                 if (high == IWL_RATE_INVALID)
 789                         break;
 790                 if (rate_mask & (1 << high))
 791                         break;
 792                 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
 793         }
 794
 795         return (high << 8) | low;
 796 }
 797
 798 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
 799                              struct iwl_scale_tbl_info *tbl,
 800                              u8 scale_index, u8 ht_possible)
 801 {
 802         s32 low;
 803         u16 rate_mask;
 804         u16 high_low;
 805         u8 switch_to_legacy = 0;
 806         u8 is_green = lq_sta->is_green;
 807         struct iwl_priv *priv = lq_sta->drv;
 808
 809         /* check if we need to switch from HT to legacy rates.
 810          * assumption is that mandatory rates (1Mbps or 6Mbps)
 811          * are always supported (spec demand) */
 812         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
 813                 switch_to_legacy = 1;
 814                 scale_index = rs_ht_to_legacy[scale_index];
 815                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 816                         tbl->lq_type = LQ_A;
 817                 else
 818                         tbl->lq_type = LQ_G;
 819
 820                 if (num_of_ant(tbl->ant_type) > 1)
 821                         tbl->ant_type =
 822                                 first_antenna(priv->hw_params.valid_tx_ant);
 823
 824                 tbl->is_ht40 = 0;
 825                 tbl->is_SGI = 0;
 826                 tbl->max_search = IWL_MAX_SEARCH;
 827         }
 828
 829         rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
 830
 831         /* Mask with station rate restriction */
 832         if (is_legacy(tbl->lq_type)) {
 833                 /* supp_rates has no CCK bits in A mode */
 834                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 835                         rate_mask  = (u16)(rate_mask &
 836                            (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
 837                 else
 838                         rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
 839         }
 840
 841         /* If we switched from HT to legacy, check current rate */
 842         if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
 843                 low = scale_index;
 844                 goto out;
 845         }
 846
 847         high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
 848                                         tbl->lq_type);
 849         low = high_low & 0xff;
 850
 851         if (low == IWL_RATE_INVALID)
 852                 low = scale_index;
 853
 854 out:
 855         return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
 856 }
 857
 858 /*
 859  * Simple function to compare two rate scale table types
 860  */
 861 static bool table_type_matches(struct iwl_scale_tbl_info *a,
 862                                struct iwl_scale_tbl_info *b)
 863 {
 864         return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
 865                 (a->is_SGI == b->is_SGI);
 866 }
 867
 868 static void rs_bt_update_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 869                             struct iwl_lq_sta *lq_sta)
 870 {
 871         struct iwl_scale_tbl_info *tbl;
 872         bool full_concurrent = priv->bt_full_concurrent;
 873         unsigned long flags;
 874
 875         if (priv->bt_ant_couple_ok) {
 876                 /*
 877                  * Is there a need to switch between
 878                  * full concurrency and 3-wire?
 879                  */
 880                 spin_lock_irqsave(&priv->lock, flags);
 881                 if (priv->bt_ci_compliance && priv->bt_ant_couple_ok)
 882                         full_concurrent = true;
 883                 else
 884                         full_concurrent = false;
 885                 spin_unlock_irqrestore(&priv->lock, flags);
 886         }
 887         if ((priv->bt_traffic_load != priv->last_bt_traffic_load) ||
 888             (priv->bt_full_concurrent != full_concurrent)) {
 889                 priv->bt_full_concurrent = full_concurrent;
 890
 891                 /* Update uCode's rate table. */
 892                 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 893                 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
 894                 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
 895
 896                 queue_work(priv->workqueue, &priv->bt_full_concurrency);
 897         }
 898 }
 899
 900 /*
 901  * mac80211 sends us Tx status
 902  */
 903 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
 904                          struct ieee80211_sta *sta, void *priv_sta,
 905                          struct sk_buff *skb)
 906 {
 907         int legacy_success;
 908         int retries;
 909         int rs_index, mac_index, i;
 910         struct iwl_lq_sta *lq_sta = priv_sta;
 911         struct iwl_link_quality_cmd *table;
 912         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 913         struct iwl_priv *priv = (struct iwl_priv *)priv_r;
 914         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 915         enum mac80211_rate_control_flags mac_flags;
 916         u32 tx_rate;
 917         struct iwl_scale_tbl_info tbl_type;
 918         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
 919         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
 920         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
 921
 922         IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
 923
 924         /* Treat uninitialized rate scaling data same as non-existing. */
 925         if (!lq_sta) {
 926                 IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n");
 927                 return;
 928         } else if (!lq_sta->drv) {
 929                 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
 930                 return;
 931         }
 932
 933         if (!ieee80211_is_data(hdr->frame_control) ||
 934             info->flags & IEEE80211_TX_CTL_NO_ACK)
 935                 return;
 936
 937         /* This packet was aggregated but doesn't carry status info */
 938         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 939             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 940                 return;
 941
 942         /*
 943          * Ignore this Tx frame response if its initial rate doesn't match
 944          * that of latest Link Quality command.  There may be stragglers
 945          * from a previous Link Quality command, but we're no longer interested
 946          * in those; they're either from the "active" mode while we're trying
 947          * to check "search" mode, or a prior "search" mode after we've moved
 948          * to a new "search" mode (which might become the new "active" mode).
 949          */
 950         table = &lq_sta->lq;
 951         tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
 952         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
 953         if (priv->band == IEEE80211_BAND_5GHZ)
 954                 rs_index -= IWL_FIRST_OFDM_RATE;
 955         mac_flags = info->status.rates[0].flags;
 956         mac_index = info->status.rates[0].idx;
 957         /* For HT packets, map MCS to PLCP */
 958         if (mac_flags & IEEE80211_TX_RC_MCS) {
 959                 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
 960                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
 961                         mac_index++;
 962                 /*
 963                  * mac80211 HT index is always zero-indexed; we need to move
 964                  * HT OFDM rates after CCK rates in 2.4 GHz band
 965                  */
 966                 if (priv->band == IEEE80211_BAND_2GHZ)
 967                         mac_index += IWL_FIRST_OFDM_RATE;
 968         }
 969         /* Here we actually compare this rate to the latest LQ command */
 970         if ((mac_index < 0) ||
 971             (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
 972             (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
 973             (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
 974             (tbl_type.ant_type != info->antenna_sel_tx) ||
 975             (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
 976             (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
 977             (rs_index != mac_index)) {
 978                 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate);
 979                 /*
 980                  * Since rates mis-match, the last LQ command may have failed.
 981                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
 982                  * ... driver.
 983                  */
 984                 lq_sta->missed_rate_counter++;
 985                 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
 986                         lq_sta->missed_rate_counter = 0;
 987                         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
 988                 }
 989                 /* Regardless, ignore this status info for outdated rate */
 990                 return;
 991         } else
 992                 /* Rate did match, so reset the missed_rate_counter */
 993                 lq_sta->missed_rate_counter = 0;
 994
 995         /* Figure out if rate scale algorithm is in active or search table */
 996         if (table_type_matches(&tbl_type,
 997                                 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
 998                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 999                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1000         } else if (table_type_matches(&tbl_type,
1001                                 &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
1002                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1003                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1004         } else {
1005                 IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n");
1006                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1007                 IWL_DEBUG_RATE(priv, "active- lq:%x, ant:%x, SGI:%d\n",
1008                         tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
1009                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1010                 IWL_DEBUG_RATE(priv, "search- lq:%x, ant:%x, SGI:%d\n",
1011                         tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
1012                 IWL_DEBUG_RATE(priv, "actual- lq:%x, ant:%x, SGI:%d\n",
1013                         tbl_type.lq_type, tbl_type.ant_type, tbl_type.is_SGI);
1014                 /*
1015                  * no matching table found, let's by-pass the data collection
1016                  * and continue to perform rate scale to find the rate table
1017                  */
1018                 rs_stay_in_table(lq_sta, true);
1019                 goto done;
1020         }
1021
1022         /*
1023          * Updating the frame history depends on whether packets were
1024          * aggregated.
1025          *
1026          * For aggregation, all packets were transmitted at the same rate, the
1027          * first index into rate scale table.
1028          */
1029         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1030                 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
1031                 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
1032                                 &rs_index);
1033                 rs_collect_tx_data(curr_tbl, rs_index,
1034                                    info->status.ampdu_len,
1035                                    info->status.ampdu_ack_len);
1036
1037                 /* Update success/fail counts if not searching for new mode */
1038                 if (lq_sta->stay_in_tbl) {
1039                         lq_sta->total_success += info->status.ampdu_ack_len;
1040                         lq_sta->total_failed += (info->status.ampdu_len -
1041                                         info->status.ampdu_ack_len);
1042                 }
1043         } else {
1044         /*
1045          * For legacy, update frame history with for each Tx retry.
1046          */
1047                 retries = info->status.rates[0].count - 1;
1048                 /* HW doesn't send more than 15 retries */
1049                 retries = min(retries, 15);
1050
1051                 /* The last transmission may have been successful */
1052                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1053                 /* Collect data for each rate used during failed TX attempts */
1054                 for (i = 0; i <= retries; ++i) {
1055                         tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
1056                         rs_get_tbl_info_from_mcs(tx_rate, priv->band,
1057                                         &tbl_type, &rs_index);
1058                         /*
1059                          * Only collect stats if retried rate is in the same RS
1060                          * table as active/search.
1061                          */
1062                         if (table_type_matches(&tbl_type, curr_tbl))
1063                                 tmp_tbl = curr_tbl;
1064                         else if (table_type_matches(&tbl_type, other_tbl))
1065                                 tmp_tbl = other_tbl;
1066                         else
1067                                 continue;
1068                         rs_collect_tx_data(tmp_tbl, rs_index, 1,
1069                                            i < retries ? 0 : legacy_success);
1070                 }
1071
1072                 /* Update success/fail counts if not searching for new mode */
1073                 if (lq_sta->stay_in_tbl) {
1074                         lq_sta->total_success += legacy_success;
1075                         lq_sta->total_failed += retries + (1 - legacy_success);
1076                 }
1077         }
1078         /* The last TX rate is cached in lq_sta; it's set in if/else above */
1079         lq_sta->last_rate_n_flags = tx_rate;
1080 done:
1081         /* See if there's a better rate or modulation mode to try. */
1082         if (sta && sta->supp_rates[sband->band])
1083                 rs_rate_scale_perform(priv, skb, sta, lq_sta);
1084
1085 #if defined(CONFIG_MAC80211_DEBUGFS) && defined(CONFIG_IWLWIFI_DEVICE_SVTOOL)
1086         if ((priv->tm_fixed_rate) &&
1087             (priv->tm_fixed_rate != lq_sta->dbg_fixed_rate))
1088                 rs_program_fix_rate(priv, lq_sta);
1089 #endif
1090         if (priv->cfg->bt_params && priv->cfg->bt_params->advanced_bt_coexist)
1091                 rs_bt_update_lq(priv, ctx, lq_sta);
1092 }
1093
1094 /*
1095  * Begin a period of staying with a selected modulation mode.
1096  * Set "stay_in_tbl" flag to prevent any mode switches.
1097  * Set frame tx success limits according to legacy vs. high-throughput,
1098  * and reset overall (spanning all rates) tx success history statistics.
1099  * These control how long we stay using same modulation mode before
1100  * searching for a new mode.
1101  */
1102 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
1103                                  struct iwl_lq_sta *lq_sta)
1104 {
1105         IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
1106         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
1107         if (is_legacy) {
1108                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1109                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1110                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1111         } else {
1112                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1113                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1114                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1115         }
1116         lq_sta->table_count = 0;
1117         lq_sta->total_failed = 0;
1118         lq_sta->total_success = 0;
1119         lq_sta->flush_timer = jiffies;
1120         lq_sta->action_counter = 0;
1121 }
1122
1123 /*
1124  * Find correct throughput table for given mode of modulation
1125  */
1126 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1127                                       struct iwl_scale_tbl_info *tbl)
1128 {
1129         /* Used to choose among HT tables */
1130         s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1131
1132         /* Check for invalid LQ type */
1133         if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1134                 tbl->expected_tpt = expected_tpt_legacy;
1135                 return;
1136         }
1137
1138         /* Legacy rates have only one table */
1139         if (is_legacy(tbl->lq_type)) {
1140                 tbl->expected_tpt = expected_tpt_legacy;
1141                 return;
1142         }
1143
1144         /* Choose among many HT tables depending on number of streams
1145          * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
1146          * status */
1147         if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1148                 ht_tbl_pointer = expected_tpt_siso20MHz;
1149         else if (is_siso(tbl->lq_type))
1150                 ht_tbl_pointer = expected_tpt_siso40MHz;
1151         else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1152                 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1153         else if (is_mimo2(tbl->lq_type))
1154                 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1155         else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1156                 ht_tbl_pointer = expected_tpt_mimo3_20MHz;
1157         else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
1158                 ht_tbl_pointer = expected_tpt_mimo3_40MHz;
1159
1160         if (!tbl->is_SGI && !lq_sta->is_agg)            /* Normal */
1161                 tbl->expected_tpt = ht_tbl_pointer[0];
1162         else if (tbl->is_SGI && !lq_sta->is_agg)        /* SGI */
1163                 tbl->expected_tpt = ht_tbl_pointer[1];
1164         else if (!tbl->is_SGI && lq_sta->is_agg)        /* AGG */
1165                 tbl->expected_tpt = ht_tbl_pointer[2];
1166         else                                            /* AGG+SGI */
1167                 tbl->expected_tpt = ht_tbl_pointer[3];
1168 }
1169
1170 /*
1171  * Find starting rate for new "search" high-throughput mode of modulation.
1172  * Goal is to find lowest expected rate (under perfect conditions) that is
1173  * above the current measured throughput of "active" mode, to give new mode
1174  * a fair chance to prove itself without too many challenges.
1175  *
1176  * This gets called when transitioning to more aggressive modulation
1177  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1178  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1179  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1180  * bit rate will typically need to increase, but not if performance was bad.
1181  */
1182 static s32 rs_get_best_rate(struct iwl_priv *priv,
1183                             struct iwl_lq_sta *lq_sta,
1184                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1185                             u16 rate_mask, s8 index)
1186 {
1187         /* "active" values */
1188         struct iwl_scale_tbl_info *active_tbl =
1189             &(lq_sta->lq_info[lq_sta->active_tbl]);
1190         s32 active_sr = active_tbl->win[index].success_ratio;
1191         s32 active_tpt = active_tbl->expected_tpt[index];
1192
1193         /* expected "search" throughput */
1194         s32 *tpt_tbl = tbl->expected_tpt;
1195
1196         s32 new_rate, high, low, start_hi;
1197         u16 high_low;
1198         s8 rate = index;
1199
1200         new_rate = high = low = start_hi = IWL_RATE_INVALID;
1201
1202         for (; ;) {
1203                 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1204                                                 tbl->lq_type);
1205
1206                 low = high_low & 0xff;
1207                 high = (high_low >> 8) & 0xff;
1208
1209                 /*
1210                  * Lower the "search" bit rate, to give new "search" mode
1211                  * approximately the same throughput as "active" if:
1212                  *
1213                  * 1) "Active" mode has been working modestly well (but not
1214                  *    great), and expected "search" throughput (under perfect
1215                  *    conditions) at candidate rate is above the actual
1216                  *    measured "active" throughput (but less than expected
1217                  *    "active" throughput under perfect conditions).
1218                  * OR
1219                  * 2) "Active" mode has been working perfectly or very well
1220                  *    and expected "search" throughput (under perfect
1221                  *    conditions) at candidate rate is above expected
1222                  *    "active" throughput (under perfect conditions).
1223                  */
1224                 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1225                      ((active_sr > IWL_RATE_DECREASE_TH) &&
1226                       (active_sr <= IWL_RATE_HIGH_TH) &&
1227                       (tpt_tbl[rate] <= active_tpt))) ||
1228                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1229                      (tpt_tbl[rate] > active_tpt))) {
1230
1231                         /* (2nd or later pass)
1232                          * If we've already tried to raise the rate, and are
1233                          * now trying to lower it, use the higher rate. */
1234                         if (start_hi != IWL_RATE_INVALID) {
1235                                 new_rate = start_hi;
1236                                 break;
1237                         }
1238
1239                         new_rate = rate;
1240
1241                         /* Loop again with lower rate */
1242                         if (low != IWL_RATE_INVALID)
1243                                 rate = low;
1244
1245                         /* Lower rate not available, use the original */
1246                         else
1247                                 break;
1248
1249                 /* Else try to raise the "search" rate to match "active" */
1250                 } else {
1251                         /* (2nd or later pass)
1252                          * If we've already tried to lower the rate, and are
1253                          * now trying to raise it, use the lower rate. */
1254                         if (new_rate != IWL_RATE_INVALID)
1255                                 break;
1256
1257                         /* Loop again with higher rate */
1258                         else if (high != IWL_RATE_INVALID) {
1259                                 start_hi = high;
1260                                 rate = high;
1261
1262                         /* Higher rate not available, use the original */
1263                         } else {
1264                                 new_rate = rate;
1265                                 break;
1266                         }
1267                 }
1268         }
1269
1270         return new_rate;
1271 }
1272
1273 /*
1274  * Set up search table for MIMO2
1275  */
1276 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1277                              struct iwl_lq_sta *lq_sta,
1278                              struct ieee80211_conf *conf,
1279                              struct ieee80211_sta *sta,
1280                              struct iwl_scale_tbl_info *tbl, int index)
1281 {
1282         u16 rate_mask;
1283         s32 rate;
1284         s8 is_green = lq_sta->is_green;
1285         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1286         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1287
1288         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1289                 return -1;
1290
1291         if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1292                                                 == WLAN_HT_CAP_SM_PS_STATIC)
1293                 return -1;
1294
1295         /* Need both Tx chains/antennas to support MIMO */
1296         if (priv->hw_params.tx_chains_num < 2)
1297                 return -1;
1298
1299         IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1300
1301         tbl->lq_type = LQ_MIMO2;
1302         tbl->is_dup = lq_sta->is_dup;
1303         tbl->action = 0;
1304         tbl->max_search = IWL_MAX_SEARCH;
1305         rate_mask = lq_sta->active_mimo2_rate;
1306
1307         if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1308                 tbl->is_ht40 = 1;
1309         else
1310                 tbl->is_ht40 = 0;
1311
1312         rs_set_expected_tpt_table(lq_sta, tbl);
1313
1314         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1315
1316         IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1317         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1318                 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1319                                                 rate, rate_mask);
1320                 return -1;
1321         }
1322         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1323
1324         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1325                      tbl->current_rate, is_green);
1326         return 0;
1327 }
1328
1329 /*
1330  * Set up search table for MIMO3
1331  */
1332 static int rs_switch_to_mimo3(struct iwl_priv *priv,
1333                              struct iwl_lq_sta *lq_sta,
1334                              struct ieee80211_conf *conf,
1335                              struct ieee80211_sta *sta,
1336                              struct iwl_scale_tbl_info *tbl, int index)
1337 {
1338         u16 rate_mask;
1339         s32 rate;
1340         s8 is_green = lq_sta->is_green;
1341         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1342         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1343
1344         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1345                 return -1;
1346
1347         if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1348                                                 == WLAN_HT_CAP_SM_PS_STATIC)
1349                 return -1;
1350
1351         /* Need both Tx chains/antennas to support MIMO */
1352         if (priv->hw_params.tx_chains_num < 3)
1353                 return -1;
1354
1355         IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1356
1357         tbl->lq_type = LQ_MIMO3;
1358         tbl->is_dup = lq_sta->is_dup;
1359         tbl->action = 0;
1360         tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1361         rate_mask = lq_sta->active_mimo3_rate;
1362
1363         if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1364                 tbl->is_ht40 = 1;
1365         else
1366                 tbl->is_ht40 = 0;
1367
1368         rs_set_expected_tpt_table(lq_sta, tbl);
1369
1370         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1371
1372         IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1373                 rate, rate_mask);
1374         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1375                 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1376                                                 rate, rate_mask);
1377                 return -1;
1378         }
1379         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1380
1381         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1382                      tbl->current_rate, is_green);
1383         return 0;
1384 }
1385
1386 /*
1387  * Set up search table for SISO
1388  */
1389 static int rs_switch_to_siso(struct iwl_priv *priv,
1390                              struct iwl_lq_sta *lq_sta,
1391                              struct ieee80211_conf *conf,
1392                              struct ieee80211_sta *sta,
1393                              struct iwl_scale_tbl_info *tbl, int index)
1394 {
1395         u16 rate_mask;
1396         u8 is_green = lq_sta->is_green;
1397         s32 rate;
1398         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1399         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1400
1401         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1402                 return -1;
1403
1404         IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1405
1406         tbl->is_dup = lq_sta->is_dup;
1407         tbl->lq_type = LQ_SISO;
1408         tbl->action = 0;
1409         tbl->max_search = IWL_MAX_SEARCH;
1410         rate_mask = lq_sta->active_siso_rate;
1411
1412         if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1413                 tbl->is_ht40 = 1;
1414         else
1415                 tbl->is_ht40 = 0;
1416
1417         if (is_green)
1418                 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1419
1420         rs_set_expected_tpt_table(lq_sta, tbl);
1421         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1422
1423         IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1424         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1425                 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1426                              rate, rate_mask);
1427                 return -1;
1428         }
1429         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1430         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1431                      tbl->current_rate, is_green);
1432         return 0;
1433 }
1434
1435 /*
1436  * Try to switch to new modulation mode from legacy
1437  */
1438 static int rs_move_legacy_other(struct iwl_priv *priv,
1439                                 struct iwl_lq_sta *lq_sta,
1440                                 struct ieee80211_conf *conf,
1441                                 struct ieee80211_sta *sta,
1442                                 int index)
1443 {
1444         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1445         struct iwl_scale_tbl_info *search_tbl =
1446                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1447         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1448         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1449                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1450         u8 start_action;
1451         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1452         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1453         int ret = 0;
1454         u8 update_search_tbl_counter = 0;
1455
1456         switch (priv->bt_traffic_load) {
1457         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1458                 /* nothing */
1459                 break;
1460         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1461                 /* avoid antenna B unless MIMO */
1462                 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1463                 if (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2)
1464                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1465                 break;
1466         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1467         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1468                 /* avoid antenna B and MIMO */
1469                 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1470                 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2 &&
1471                     tbl->action != IWL_LEGACY_SWITCH_SISO)
1472                         tbl->action = IWL_LEGACY_SWITCH_SISO;
1473                 break;
1474         default:
1475                 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1476                 break;
1477         }
1478
1479         if (!iwl_ht_enabled(priv))
1480                 /* stay in Legacy */
1481                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1482         else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1483                    tbl->action > IWL_LEGACY_SWITCH_SISO)
1484                 tbl->action = IWL_LEGACY_SWITCH_SISO;
1485
1486         /* configure as 1x1 if bt full concurrency */
1487         if (priv->bt_full_concurrent) {
1488                 if (!iwl_ht_enabled(priv))
1489                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1490                 else if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1491                         tbl->action = IWL_LEGACY_SWITCH_SISO;
1492                 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1493         }
1494
1495         start_action = tbl->action;
1496         for (; ;) {
1497                 lq_sta->action_counter++;
1498                 switch (tbl->action) {
1499                 case IWL_LEGACY_SWITCH_ANTENNA1:
1500                 case IWL_LEGACY_SWITCH_ANTENNA2:
1501                         IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1502
1503                         if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1504                                                         tx_chains_num <= 1) ||
1505                             (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1506                                                         tx_chains_num <= 2))
1507                                 break;
1508
1509                         /* Don't change antenna if success has been great */
1510                         if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1511                             !priv->bt_full_concurrent &&
1512                             priv->bt_traffic_load ==
1513                                         IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1514                                 break;
1515
1516                         /* Set up search table to try other antenna */
1517                         memcpy(search_tbl, tbl, sz);
1518
1519                         if (rs_toggle_antenna(valid_tx_ant,
1520                                 &search_tbl->current_rate, search_tbl)) {
1521                                 update_search_tbl_counter = 1;
1522                                 rs_set_expected_tpt_table(lq_sta, search_tbl);
1523                                 goto out;
1524                         }
1525                         break;
1526                 case IWL_LEGACY_SWITCH_SISO:
1527                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1528
1529                         /* Set up search table to try SISO */
1530                         memcpy(search_tbl, tbl, sz);
1531                         search_tbl->is_SGI = 0;
1532                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1533                                                  search_tbl, index);
1534                         if (!ret) {
1535                                 lq_sta->action_counter = 0;
1536                                 goto out;
1537                         }
1538
1539                         break;
1540                 case IWL_LEGACY_SWITCH_MIMO2_AB:
1541                 case IWL_LEGACY_SWITCH_MIMO2_AC:
1542                 case IWL_LEGACY_SWITCH_MIMO2_BC:
1543                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1544
1545                         /* Set up search table to try MIMO */
1546                         memcpy(search_tbl, tbl, sz);
1547                         search_tbl->is_SGI = 0;
1548
1549                         if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1550                                 search_tbl->ant_type = ANT_AB;
1551                         else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1552                                 search_tbl->ant_type = ANT_AC;
1553                         else
1554                                 search_tbl->ant_type = ANT_BC;
1555
1556                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1557                                 break;
1558
1559                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1560                                                  search_tbl, index);
1561                         if (!ret) {
1562                                 lq_sta->action_counter = 0;
1563                                 goto out;
1564                         }
1565                         break;
1566
1567                 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1568                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1569
1570                         /* Set up search table to try MIMO3 */
1571                         memcpy(search_tbl, tbl, sz);
1572                         search_tbl->is_SGI = 0;
1573
1574                         search_tbl->ant_type = ANT_ABC;
1575
1576                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1577                                 break;
1578
1579                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1580                                                  search_tbl, index);
1581                         if (!ret) {
1582                                 lq_sta->action_counter = 0;
1583                                 goto out;
1584                         }
1585                         break;
1586                 }
1587                 tbl->action++;
1588                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1589                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1590
1591                 if (tbl->action == start_action)
1592                         break;
1593
1594         }
1595         search_tbl->lq_type = LQ_NONE;
1596         return 0;
1597
1598 out:
1599         lq_sta->search_better_tbl = 1;
1600         tbl->action++;
1601         if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1602                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1603         if (update_search_tbl_counter)
1604                 search_tbl->action = tbl->action;
1605         return 0;
1606
1607 }
1608
1609 /*
1610  * Try to switch to new modulation mode from SISO
1611  */
1612 static int rs_move_siso_to_other(struct iwl_priv *priv,
1613                                  struct iwl_lq_sta *lq_sta,
1614                                  struct ieee80211_conf *conf,
1615                                  struct ieee80211_sta *sta, int index)
1616 {
1617         u8 is_green = lq_sta->is_green;
1618         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1619         struct iwl_scale_tbl_info *search_tbl =
1620                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1621         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1622         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1623         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1624                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1625         u8 start_action;
1626         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1627         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1628         u8 update_search_tbl_counter = 0;
1629         int ret;
1630
1631         switch (priv->bt_traffic_load) {
1632         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1633                 /* nothing */
1634                 break;
1635         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1636                 /* avoid antenna B unless MIMO */
1637                 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1638                 if (tbl->action == IWL_SISO_SWITCH_ANTENNA2)
1639                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1640                 break;
1641         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1642         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1643                 /* avoid antenna B and MIMO */
1644                 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1645                 if (tbl->action != IWL_SISO_SWITCH_ANTENNA1)
1646                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1647                 break;
1648         default:
1649                 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1650                 break;
1651         }
1652
1653         if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1654             tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1655                 /* stay in SISO */
1656                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1657         }
1658
1659         /* configure as 1x1 if bt full concurrency */
1660         if (priv->bt_full_concurrent) {
1661                 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1662                 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1663                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1664         }
1665
1666         start_action = tbl->action;
1667         for (;;) {
1668                 lq_sta->action_counter++;
1669                 switch (tbl->action) {
1670                 case IWL_SISO_SWITCH_ANTENNA1:
1671                 case IWL_SISO_SWITCH_ANTENNA2:
1672                         IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1673                         if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1674                                                 tx_chains_num <= 1) ||
1675                             (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1676                                                 tx_chains_num <= 2))
1677                                 break;
1678
1679                         if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1680                             !priv->bt_full_concurrent &&
1681                             priv->bt_traffic_load ==
1682                                         IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1683                                 break;
1684
1685                         memcpy(search_tbl, tbl, sz);
1686                         if (rs_toggle_antenna(valid_tx_ant,
1687                                        &search_tbl->current_rate, search_tbl)) {
1688                                 update_search_tbl_counter = 1;
1689                                 goto out;
1690                         }
1691                         break;
1692                 case IWL_SISO_SWITCH_MIMO2_AB:
1693                 case IWL_SISO_SWITCH_MIMO2_AC:
1694                 case IWL_SISO_SWITCH_MIMO2_BC:
1695                         IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1696                         memcpy(search_tbl, tbl, sz);
1697                         search_tbl->is_SGI = 0;
1698
1699                         if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1700                                 search_tbl->ant_type = ANT_AB;
1701                         else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1702                                 search_tbl->ant_type = ANT_AC;
1703                         else
1704                                 search_tbl->ant_type = ANT_BC;
1705
1706                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1707                                 break;
1708
1709                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1710                                                  search_tbl, index);
1711                         if (!ret)
1712                                 goto out;
1713                         break;
1714                 case IWL_SISO_SWITCH_GI:
1715                         if (!tbl->is_ht40 && !(ht_cap->cap &
1716                                                 IEEE80211_HT_CAP_SGI_20))
1717                                 break;
1718                         if (tbl->is_ht40 && !(ht_cap->cap &
1719                                                 IEEE80211_HT_CAP_SGI_40))
1720                                 break;
1721
1722                         IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1723
1724                         memcpy(search_tbl, tbl, sz);
1725                         if (is_green) {
1726                                 if (!tbl->is_SGI)
1727                                         break;
1728                                 else
1729                                         IWL_ERR(priv,
1730                                                 "SGI was set in GF+SISO\n");
1731                         }
1732                         search_tbl->is_SGI = !tbl->is_SGI;
1733                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1734                         if (tbl->is_SGI) {
1735                                 s32 tpt = lq_sta->last_tpt / 100;
1736                                 if (tpt >= search_tbl->expected_tpt[index])
1737                                         break;
1738                         }
1739                         search_tbl->current_rate =
1740                                 rate_n_flags_from_tbl(priv, search_tbl,
1741                                                       index, is_green);
1742                         update_search_tbl_counter = 1;
1743                         goto out;
1744                 case IWL_SISO_SWITCH_MIMO3_ABC:
1745                         IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1746                         memcpy(search_tbl, tbl, sz);
1747                         search_tbl->is_SGI = 0;
1748                         search_tbl->ant_type = ANT_ABC;
1749
1750                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1751                                 break;
1752
1753                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1754                                                  search_tbl, index);
1755                         if (!ret)
1756                                 goto out;
1757                         break;
1758                 }
1759                 tbl->action++;
1760                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1761                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1762
1763                 if (tbl->action == start_action)
1764                         break;
1765         }
1766         search_tbl->lq_type = LQ_NONE;
1767         return 0;
1768
1769  out:
1770         lq_sta->search_better_tbl = 1;
1771         tbl->action++;
1772         if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1773                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1774         if (update_search_tbl_counter)
1775                 search_tbl->action = tbl->action;
1776
1777         return 0;
1778 }
1779
1780 /*
1781  * Try to switch to new modulation mode from MIMO2
1782  */
1783 static int rs_move_mimo2_to_other(struct iwl_priv *priv,
1784                                  struct iwl_lq_sta *lq_sta,
1785                                  struct ieee80211_conf *conf,
1786                                  struct ieee80211_sta *sta, int index)
1787 {
1788         s8 is_green = lq_sta->is_green;
1789         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1790         struct iwl_scale_tbl_info *search_tbl =
1791                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1792         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1793         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1794         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1795                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1796         u8 start_action;
1797         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1798         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1799         u8 update_search_tbl_counter = 0;
1800         int ret;
1801
1802         switch (priv->bt_traffic_load) {
1803         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1804                 /* nothing */
1805                 break;
1806         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1807         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1808                 /* avoid antenna B and MIMO */
1809                 if (tbl->action != IWL_MIMO2_SWITCH_SISO_A)
1810                         tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1811                 break;
1812         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1813                 /* avoid antenna B unless MIMO */
1814                 if (tbl->action == IWL_MIMO2_SWITCH_SISO_B ||
1815                     tbl->action == IWL_MIMO2_SWITCH_SISO_C)
1816                         tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1817                 break;
1818         default:
1819                 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1820                 break;
1821         }
1822
1823         if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1824             (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1825              tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1826                 /* switch in SISO */
1827                 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1828         }
1829
1830         /* configure as 1x1 if bt full concurrency */
1831         if (priv->bt_full_concurrent &&
1832             (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1833              tbl->action > IWL_MIMO2_SWITCH_SISO_C))
1834                 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1835
1836         start_action = tbl->action;
1837         for (;;) {
1838                 lq_sta->action_counter++;
1839                 switch (tbl->action) {
1840                 case IWL_MIMO2_SWITCH_ANTENNA1:
1841                 case IWL_MIMO2_SWITCH_ANTENNA2:
1842                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1843
1844                         if (tx_chains_num <= 2)
1845                                 break;
1846
1847                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1848                                 break;
1849
1850                         memcpy(search_tbl, tbl, sz);
1851                         if (rs_toggle_antenna(valid_tx_ant,
1852                                        &search_tbl->current_rate, search_tbl)) {
1853                                 update_search_tbl_counter = 1;
1854                                 goto out;
1855                         }
1856                         break;
1857                 case IWL_MIMO2_SWITCH_SISO_A:
1858                 case IWL_MIMO2_SWITCH_SISO_B:
1859                 case IWL_MIMO2_SWITCH_SISO_C:
1860                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1861
1862                         /* Set up new search table for SISO */
1863                         memcpy(search_tbl, tbl, sz);
1864
1865                         if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1866                                 search_tbl->ant_type = ANT_A;
1867                         else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1868                                 search_tbl->ant_type = ANT_B;
1869                         else
1870                                 search_tbl->ant_type = ANT_C;
1871
1872                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1873                                 break;
1874
1875                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1876                                                  search_tbl, index);
1877                         if (!ret)
1878                                 goto out;
1879
1880                         break;
1881
1882                 case IWL_MIMO2_SWITCH_GI:
1883                         if (!tbl->is_ht40 && !(ht_cap->cap &
1884                                                 IEEE80211_HT_CAP_SGI_20))
1885                                 break;
1886                         if (tbl->is_ht40 && !(ht_cap->cap &
1887                                                 IEEE80211_HT_CAP_SGI_40))
1888                                 break;
1889
1890                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1891
1892                         /* Set up new search table for MIMO2 */
1893                         memcpy(search_tbl, tbl, sz);
1894                         search_tbl->is_SGI = !tbl->is_SGI;
1895                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1896                         /*
1897                          * If active table already uses the fastest possible
1898                          * modulation (dual stream with short guard interval),
1899                          * and it's working well, there's no need to look
1900                          * for a better type of modulation!
1901                          */
1902                         if (tbl->is_SGI) {
1903                                 s32 tpt = lq_sta->last_tpt / 100;
1904                                 if (tpt >= search_tbl->expected_tpt[index])
1905                                         break;
1906                         }
1907                         search_tbl->current_rate =
1908                                 rate_n_flags_from_tbl(priv, search_tbl,
1909                                                       index, is_green);
1910                         update_search_tbl_counter = 1;
1911                         goto out;
1912
1913                 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1914                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1915                         memcpy(search_tbl, tbl, sz);
1916                         search_tbl->is_SGI = 0;
1917                         search_tbl->ant_type = ANT_ABC;
1918
1919                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1920                                 break;
1921
1922                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1923                                                  search_tbl, index);
1924                         if (!ret)
1925                                 goto out;
1926
1927                         break;
1928                 }
1929                 tbl->action++;
1930                 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1931                         tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1932
1933                 if (tbl->action == start_action)
1934                         break;
1935         }
1936         search_tbl->lq_type = LQ_NONE;
1937         return 0;
1938  out:
1939         lq_sta->search_better_tbl = 1;
1940         tbl->action++;
1941         if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1942                 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1943         if (update_search_tbl_counter)
1944                 search_tbl->action = tbl->action;
1945
1946         return 0;
1947
1948 }
1949
1950 /*
1951  * Try to switch to new modulation mode from MIMO3
1952  */
1953 static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1954                                  struct iwl_lq_sta *lq_sta,
1955                                  struct ieee80211_conf *conf,
1956                                  struct ieee80211_sta *sta, int index)
1957 {
1958         s8 is_green = lq_sta->is_green;
1959         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1960         struct iwl_scale_tbl_info *search_tbl =
1961                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1962         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1963         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1964         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1965                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1966         u8 start_action;
1967         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1968         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1969         int ret;
1970         u8 update_search_tbl_counter = 0;
1971
1972         switch (priv->bt_traffic_load) {
1973         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1974                 /* nothing */
1975                 break;
1976         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1977         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1978                 /* avoid antenna B and MIMO */
1979                 if (tbl->action != IWL_MIMO3_SWITCH_SISO_A)
1980                         tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1981                 break;
1982         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1983                 /* avoid antenna B unless MIMO */
1984                 if (tbl->action == IWL_MIMO3_SWITCH_SISO_B ||
1985                     tbl->action == IWL_MIMO3_SWITCH_SISO_C)
1986                         tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1987                 break;
1988         default:
1989                 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1990                 break;
1991         }
1992
1993         if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1994             (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1995              tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1996                 /* switch in SISO */
1997                 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1998         }
1999
2000         /* configure as 1x1 if bt full concurrency */
2001         if (priv->bt_full_concurrent &&
2002             (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
2003              tbl->action > IWL_MIMO3_SWITCH_SISO_C))
2004                 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
2005
2006         start_action = tbl->action;
2007         for (;;) {
2008                 lq_sta->action_counter++;
2009                 switch (tbl->action) {
2010                 case IWL_MIMO3_SWITCH_ANTENNA1:
2011                 case IWL_MIMO3_SWITCH_ANTENNA2:
2012                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
2013
2014                         if (tx_chains_num <= 3)
2015                                 break;
2016
2017                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
2018                                 break;
2019
2020                         memcpy(search_tbl, tbl, sz);
2021                         if (rs_toggle_antenna(valid_tx_ant,
2022                                        &search_tbl->current_rate, search_tbl))
2023                                 goto out;
2024                         break;
2025                 case IWL_MIMO3_SWITCH_SISO_A:
2026                 case IWL_MIMO3_SWITCH_SISO_B:
2027                 case IWL_MIMO3_SWITCH_SISO_C:
2028                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
2029
2030                         /* Set up new search table for SISO */
2031                         memcpy(search_tbl, tbl, sz);
2032
2033                         if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
2034                                 search_tbl->ant_type = ANT_A;
2035                         else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
2036                                 search_tbl->ant_type = ANT_B;
2037                         else
2038                                 search_tbl->ant_type = ANT_C;
2039
2040                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2041                                 break;
2042
2043                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
2044                                                  search_tbl, index);
2045                         if (!ret)
2046                                 goto out;
2047
2048                         break;
2049
2050                 case IWL_MIMO3_SWITCH_MIMO2_AB:
2051                 case IWL_MIMO3_SWITCH_MIMO2_AC:
2052                 case IWL_MIMO3_SWITCH_MIMO2_BC:
2053                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
2054
2055                         memcpy(search_tbl, tbl, sz);
2056                         search_tbl->is_SGI = 0;
2057                         if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
2058                                 search_tbl->ant_type = ANT_AB;
2059                         else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
2060                                 search_tbl->ant_type = ANT_AC;
2061                         else
2062                                 search_tbl->ant_type = ANT_BC;
2063
2064                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2065                                 break;
2066
2067                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
2068                                                  search_tbl, index);
2069                         if (!ret)
2070                                 goto out;
2071
2072                         break;
2073
2074                 case IWL_MIMO3_SWITCH_GI:
2075                         if (!tbl->is_ht40 && !(ht_cap->cap &
2076                                                 IEEE80211_HT_CAP_SGI_20))
2077                                 break;
2078                         if (tbl->is_ht40 && !(ht_cap->cap &
2079                                                 IEEE80211_HT_CAP_SGI_40))
2080                                 break;
2081
2082                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
2083
2084                         /* Set up new search table for MIMO */
2085                         memcpy(search_tbl, tbl, sz);
2086                         search_tbl->is_SGI = !tbl->is_SGI;
2087                         rs_set_expected_tpt_table(lq_sta, search_tbl);
2088                         /*
2089                          * If active table already uses the fastest possible
2090                          * modulation (dual stream with short guard interval),
2091                          * and it's working well, there's no need to look
2092                          * for a better type of modulation!
2093                          */
2094                         if (tbl->is_SGI) {
2095                                 s32 tpt = lq_sta->last_tpt / 100;
2096                                 if (tpt >= search_tbl->expected_tpt[index])
2097                                         break;
2098                         }
2099                         search_tbl->current_rate =
2100                                 rate_n_flags_from_tbl(priv, search_tbl,
2101                                                       index, is_green);
2102                         update_search_tbl_counter = 1;
2103                         goto out;
2104                 }
2105                 tbl->action++;
2106                 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2107                         tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2108
2109                 if (tbl->action == start_action)
2110                         break;
2111         }
2112         search_tbl->lq_type = LQ_NONE;
2113         return 0;
2114  out:
2115         lq_sta->search_better_tbl = 1;
2116         tbl->action++;
2117         if (tbl->action > IWL_MIMO3_SWITCH_GI)
2118                 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2119         if (update_search_tbl_counter)
2120                 search_tbl->action = tbl->action;
2121
2122         return 0;
2123
2124 }
2125
2126 /*
2127  * Check whether we should continue using same modulation mode, or
2128  * begin search for a new mode, based on:
2129  * 1) # tx successes or failures while using this mode
2130  * 2) # times calling this function
2131  * 3) elapsed time in this mode (not used, for now)
2132  */
2133 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
2134 {
2135         struct iwl_scale_tbl_info *tbl;
2136         int i;
2137         int active_tbl;
2138         int flush_interval_passed = 0;
2139         struct iwl_priv *priv;
2140
2141         priv = lq_sta->drv;
2142         active_tbl = lq_sta->active_tbl;
2143
2144         tbl = &(lq_sta->lq_info[active_tbl]);
2145
2146         /* If we've been disallowing search, see if we should now allow it */
2147         if (lq_sta->stay_in_tbl) {
2148
2149                 /* Elapsed time using current modulation mode */
2150                 if (lq_sta->flush_timer)
2151                         flush_interval_passed =
2152                         time_after(jiffies,
2153                                         (unsigned long)(lq_sta->flush_timer +
2154                                         IWL_RATE_SCALE_FLUSH_INTVL));
2155
2156                 /*
2157                  * Check if we should allow search for new modulation mode.
2158                  * If many frames have failed or succeeded, or we've used
2159                  * this same modulation for a long time, allow search, and
2160                  * reset history stats that keep track of whether we should
2161                  * allow a new search.  Also (below) reset all bitmaps and
2162                  * stats in active history.
2163                  */
2164                 if (force_search ||
2165                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
2166                     (lq_sta->total_success > lq_sta->max_success_limit) ||
2167                     ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
2168                      && (flush_interval_passed))) {
2169                         IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n:",
2170                                      lq_sta->total_failed,
2171                                      lq_sta->total_success,
2172                                      flush_interval_passed);
2173
2174                         /* Allow search for new mode */
2175                         lq_sta->stay_in_tbl = 0;        /* only place reset */
2176                         lq_sta->total_failed = 0;
2177                         lq_sta->total_success = 0;
2178                         lq_sta->flush_timer = 0;
2179
2180                 /*
2181                  * Else if we've used this modulation mode enough repetitions
2182                  * (regardless of elapsed time or success/failure), reset
2183                  * history bitmaps and rate-specific stats for all rates in
2184                  * active table.
2185                  */
2186                 } else {
2187                         lq_sta->table_count++;
2188                         if (lq_sta->table_count >=
2189                             lq_sta->table_count_limit) {
2190                                 lq_sta->table_count = 0;
2191
2192                                 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
2193                                 for (i = 0; i < IWL_RATE_COUNT; i++)
2194                                         rs_rate_scale_clear_window(
2195                                                 &(tbl->win[i]));
2196                         }
2197                 }
2198
2199                 /* If transitioning to allow "search", reset all history
2200                  * bitmaps and stats in active table (this will become the new
2201                  * "search" table). */
2202                 if (!lq_sta->stay_in_tbl) {
2203                         for (i = 0; i < IWL_RATE_COUNT; i++)
2204                                 rs_rate_scale_clear_window(&(tbl->win[i]));
2205                 }
2206         }
2207 }
2208
2209 /*
2210  * setup rate table in uCode
2211  * return rate_n_flags as used in the table
2212  */
2213 static void rs_update_rate_tbl(struct iwl_priv *priv,
2214                                struct iwl_rxon_context *ctx,
2215                                struct iwl_lq_sta *lq_sta,
2216                                struct iwl_scale_tbl_info *tbl,
2217                                int index, u8 is_green)
2218 {
2219         u32 rate;
2220
2221         /* Update uCode's rate table. */
2222         rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2223         rs_fill_link_cmd(priv, lq_sta, rate);
2224         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2225 }
2226
2227 /*
2228  * Do rate scaling and search for new modulation mode.
2229  */
2230 static void rs_rate_scale_perform(struct iwl_priv *priv,
2231                                   struct sk_buff *skb,
2232                                   struct ieee80211_sta *sta,
2233                                   struct iwl_lq_sta *lq_sta)
2234 {
2235         struct ieee80211_hw *hw = priv->hw;
2236         struct ieee80211_conf *conf = &hw->conf;
2237         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2238         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2239         int low = IWL_RATE_INVALID;
2240         int high = IWL_RATE_INVALID;
2241         int index;
2242         int i;
2243         struct iwl_rate_scale_data *window = NULL;
2244         int current_tpt = IWL_INVALID_VALUE;
2245         int low_tpt = IWL_INVALID_VALUE;
2246         int high_tpt = IWL_INVALID_VALUE;
2247         u32 fail_count;
2248         s8 scale_action = 0;
2249         u16 rate_mask;
2250         u8 update_lq = 0;
2251         struct iwl_scale_tbl_info *tbl, *tbl1;
2252         u16 rate_scale_index_msk = 0;
2253         u8 is_green = 0;
2254         u8 active_tbl = 0;
2255         u8 done_search = 0;
2256         u16 high_low;
2257         s32 sr;
2258         u8 tid = MAX_TID_COUNT;
2259         struct iwl_tid_data *tid_data;
2260         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
2261         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
2262
2263         IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
2264
2265         /* Send management frames and NO_ACK data using lowest rate. */
2266         /* TODO: this could probably be improved.. */
2267         if (!ieee80211_is_data(hdr->frame_control) ||
2268             info->flags & IEEE80211_TX_CTL_NO_ACK)
2269                 return;
2270
2271         if (!sta || !lq_sta)
2272                 return;
2273
2274         lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
2275
2276         tid = rs_tl_add_packet(lq_sta, hdr);
2277         if ((tid != MAX_TID_COUNT) && (lq_sta->tx_agg_tid_en & (1 << tid))) {
2278                 tid_data = &priv->stations[lq_sta->lq.sta_id].tid[tid];
2279                 if (tid_data->agg.state == IWL_AGG_OFF)
2280                         lq_sta->is_agg = 0;
2281                 else
2282                         lq_sta->is_agg = 1;
2283         } else
2284                 lq_sta->is_agg = 0;
2285
2286         /*
2287          * Select rate-scale / modulation-mode table to work with in
2288          * the rest of this function:  "search" if searching for better
2289          * modulation mode, or "active" if doing rate scaling within a mode.
2290          */
2291         if (!lq_sta->search_better_tbl)
2292                 active_tbl = lq_sta->active_tbl;
2293         else
2294                 active_tbl = 1 - lq_sta->active_tbl;
2295
2296         tbl = &(lq_sta->lq_info[active_tbl]);
2297         if (is_legacy(tbl->lq_type))
2298                 lq_sta->is_green = 0;
2299         else
2300                 lq_sta->is_green = rs_use_green(sta);
2301         is_green = lq_sta->is_green;
2302
2303         /* current tx rate */
2304         index = lq_sta->last_txrate_idx;
2305
2306         IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2307                        tbl->lq_type);
2308
2309         /* rates available for this association, and for modulation mode */
2310         rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2311
2312         IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
2313
2314         /* mask with station rate restriction */
2315         if (is_legacy(tbl->lq_type)) {
2316                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2317                         /* supp_rates has no CCK bits in A mode */
2318                         rate_scale_index_msk = (u16) (rate_mask &
2319                                 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2320                 else
2321                         rate_scale_index_msk = (u16) (rate_mask &
2322                                                       lq_sta->supp_rates);
2323
2324         } else
2325                 rate_scale_index_msk = rate_mask;
2326
2327         if (!rate_scale_index_msk)
2328                 rate_scale_index_msk = rate_mask;
2329
2330         if (!((1 << index) & rate_scale_index_msk)) {
2331                 IWL_ERR(priv, "Current Rate is not valid\n");
2332                 if (lq_sta->search_better_tbl) {
2333                         /* revert to active table if search table is not valid*/
2334                         tbl->lq_type = LQ_NONE;
2335                         lq_sta->search_better_tbl = 0;
2336                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2337                         /* get "active" rate info */
2338                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2339                         rs_update_rate_tbl(priv, ctx, lq_sta, tbl,
2340                                            index, is_green);
2341                 }
2342                 return;
2343         }
2344
2345         /* Get expected throughput table and history window for current rate */
2346         if (!tbl->expected_tpt) {
2347                 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2348                 return;
2349         }
2350
2351         /* force user max rate if set by user */
2352         if ((lq_sta->max_rate_idx != -1) &&
2353             (lq_sta->max_rate_idx < index)) {
2354                 index = lq_sta->max_rate_idx;
2355                 update_lq = 1;
2356                 window = &(tbl->win[index]);
2357                 goto lq_update;
2358         }
2359
2360         window = &(tbl->win[index]);
2361
2362         /*
2363          * If there is not enough history to calculate actual average
2364          * throughput, keep analyzing results of more tx frames, without
2365          * changing rate or mode (bypass most of the rest of this function).
2366          * Set up new rate table in uCode only if old rate is not supported
2367          * in current association (use new rate found above).
2368          */
2369         fail_count = window->counter - window->success_counter;
2370         if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2371                         (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2372                 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2373                                "for index %d\n",
2374                                window->success_counter, window->counter, index);
2375
2376                 /* Can't calculate this yet; not enough history */
2377                 window->average_tpt = IWL_INVALID_VALUE;
2378
2379                 /* Should we stay with this modulation mode,
2380                  * or search for a new one? */
2381                 rs_stay_in_table(lq_sta, false);
2382
2383                 goto out;
2384         }
2385         /* Else we have enough samples; calculate estimate of
2386          * actual average throughput */
2387         if (window->average_tpt != ((window->success_ratio *
2388                         tbl->expected_tpt[index] + 64) / 128)) {
2389                 IWL_ERR(priv, "expected_tpt should have been calculated by now\n");
2390                 window->average_tpt = ((window->success_ratio *
2391                                         tbl->expected_tpt[index] + 64) / 128);
2392         }
2393
2394         /* If we are searching for better modulation mode, check success. */
2395         if (lq_sta->search_better_tbl &&
2396             (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
2397                 /* If good success, continue using the "search" mode;
2398                  * no need to send new link quality command, since we're
2399                  * continuing to use the setup that we've been trying. */
2400                 if (window->average_tpt > lq_sta->last_tpt) {
2401
2402                         IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2403                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
2404                                         window->success_ratio,
2405                                         window->average_tpt,
2406                                         lq_sta->last_tpt);
2407
2408                         if (!is_legacy(tbl->lq_type))
2409                                 lq_sta->enable_counter = 1;
2410
2411                         /* Swap tables; "search" becomes "active" */
2412                         lq_sta->active_tbl = active_tbl;
2413                         current_tpt = window->average_tpt;
2414
2415                 /* Else poor success; go back to mode in "active" table */
2416                 } else {
2417
2418                         IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2419                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
2420                                         window->success_ratio,
2421                                         window->average_tpt,
2422                                         lq_sta->last_tpt);
2423
2424                         /* Nullify "search" table */
2425                         tbl->lq_type = LQ_NONE;
2426
2427                         /* Revert to "active" table */
2428                         active_tbl = lq_sta->active_tbl;
2429                         tbl = &(lq_sta->lq_info[active_tbl]);
2430
2431                         /* Revert to "active" rate and throughput info */
2432                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2433                         current_tpt = lq_sta->last_tpt;
2434
2435                         /* Need to set up a new rate table in uCode */
2436                         update_lq = 1;
2437                 }
2438
2439                 /* Either way, we've made a decision; modulation mode
2440                  * search is done, allow rate adjustment next time. */
2441                 lq_sta->search_better_tbl = 0;
2442                 done_search = 1;        /* Don't switch modes below! */
2443                 goto lq_update;
2444         }
2445
2446         /* (Else) not in search of better modulation mode, try for better
2447          * starting rate, while staying in this mode. */
2448         high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2449                                         tbl->lq_type);
2450         low = high_low & 0xff;
2451         high = (high_low >> 8) & 0xff;
2452
2453         /* If user set max rate, dont allow higher than user constrain */
2454         if ((lq_sta->max_rate_idx != -1) &&
2455             (lq_sta->max_rate_idx < high))
2456                 high = IWL_RATE_INVALID;
2457
2458         sr = window->success_ratio;
2459
2460         /* Collect measured throughputs for current and adjacent rates */
2461         current_tpt = window->average_tpt;
2462         if (low != IWL_RATE_INVALID)
2463                 low_tpt = tbl->win[low].average_tpt;
2464         if (high != IWL_RATE_INVALID)
2465                 high_tpt = tbl->win[high].average_tpt;
2466
2467         scale_action = 0;
2468
2469         /* Too many failures, decrease rate */
2470         if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2471                 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2472                 scale_action = -1;
2473
2474         /* No throughput measured yet for adjacent rates; try increase. */
2475         } else if ((low_tpt == IWL_INVALID_VALUE) &&
2476                    (high_tpt == IWL_INVALID_VALUE)) {
2477
2478                 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2479                         scale_action = 1;
2480                 else if (low != IWL_RATE_INVALID)
2481                         scale_action = 0;
2482         }
2483
2484         /* Both adjacent throughputs are measured, but neither one has better
2485          * throughput; we're using the best rate, don't change it! */
2486         else if ((low_tpt != IWL_INVALID_VALUE) &&
2487                  (high_tpt != IWL_INVALID_VALUE) &&
2488                  (low_tpt < current_tpt) &&
2489                  (high_tpt < current_tpt))
2490                 scale_action = 0;
2491
2492         /* At least one adjacent rate's throughput is measured,
2493          * and may have better performance. */
2494         else {
2495                 /* Higher adjacent rate's throughput is measured */
2496                 if (high_tpt != IWL_INVALID_VALUE) {
2497                         /* Higher rate has better throughput */
2498                         if (high_tpt > current_tpt &&
2499                                         sr >= IWL_RATE_INCREASE_TH) {
2500                                 scale_action = 1;
2501                         } else {
2502                                 scale_action = 0;
2503                         }
2504
2505                 /* Lower adjacent rate's throughput is measured */
2506                 } else if (low_tpt != IWL_INVALID_VALUE) {
2507                         /* Lower rate has better throughput */
2508                         if (low_tpt > current_tpt) {
2509                                 IWL_DEBUG_RATE(priv,
2510                                     "decrease rate because of low tpt\n");
2511                                 scale_action = -1;
2512                         } else if (sr >= IWL_RATE_INCREASE_TH) {
2513                                 scale_action = 1;
2514                         }
2515                 }
2516         }
2517
2518         /* Sanity check; asked for decrease, but success rate or throughput
2519          * has been good at old rate.  Don't change it. */
2520         if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2521                     ((sr > IWL_RATE_HIGH_TH) ||
2522                      (current_tpt > (100 * tbl->expected_tpt[low]))))
2523                 scale_action = 0;
2524         if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2525                 scale_action = -1;
2526         if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
2527                 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2528                 scale_action = -1;
2529
2530         if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2531              (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2532                 if (lq_sta->last_bt_traffic > priv->bt_traffic_load) {
2533                         /*
2534                          * don't set scale_action, don't want to scale up if
2535                          * the rate scale doesn't otherwise think that is a
2536                          * good idea.
2537                          */
2538                 } else if (lq_sta->last_bt_traffic <= priv->bt_traffic_load) {
2539                         scale_action = -1;
2540                 }
2541         }
2542         lq_sta->last_bt_traffic = priv->bt_traffic_load;
2543
2544         if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2545              (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2546                 /* search for a new modulation */
2547                 rs_stay_in_table(lq_sta, true);
2548                 goto lq_update;
2549         }
2550
2551         switch (scale_action) {
2552         case -1:
2553                 /* Decrease starting rate, update uCode's rate table */
2554                 if (low != IWL_RATE_INVALID) {
2555                         update_lq = 1;
2556                         index = low;
2557                 }
2558
2559                 break;
2560         case 1:
2561                 /* Increase starting rate, update uCode's rate table */
2562                 if (high != IWL_RATE_INVALID) {
2563                         update_lq = 1;
2564                         index = high;
2565                 }
2566
2567                 break;
2568         case 0:
2569                 /* No change */
2570         default:
2571                 break;
2572         }
2573
2574         IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2575                     "high %d type %d\n",
2576                      index, scale_action, low, high, tbl->lq_type);
2577
2578 lq_update:
2579         /* Replace uCode's rate table for the destination station. */
2580         if (update_lq)
2581                 rs_update_rate_tbl(priv, ctx, lq_sta, tbl, index, is_green);
2582
2583         if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
2584                 /* Should we stay with this modulation mode,
2585                  * or search for a new one? */
2586           rs_stay_in_table(lq_sta, false);
2587         }
2588         /*
2589          * Search for new modulation mode if we're:
2590          * 1)  Not changing rates right now
2591          * 2)  Not just finishing up a search
2592          * 3)  Allowing a new search
2593          */
2594         if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2595                 /* Save current throughput to compare with "search" throughput*/
2596                 lq_sta->last_tpt = current_tpt;
2597
2598                 /* Select a new "search" modulation mode to try.
2599                  * If one is found, set up the new "search" table. */
2600                 if (is_legacy(tbl->lq_type))
2601                         rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2602                 else if (is_siso(tbl->lq_type))
2603                         rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2604                 else if (is_mimo2(tbl->lq_type))
2605                         rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2606                 else
2607                         rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2608
2609                 /* If new "search" mode was selected, set up in uCode table */
2610                 if (lq_sta->search_better_tbl) {
2611                         /* Access the "search" table, clear its history. */
2612                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2613                         for (i = 0; i < IWL_RATE_COUNT; i++)
2614                                 rs_rate_scale_clear_window(&(tbl->win[i]));
2615
2616                         /* Use new "search" start rate */
2617                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2618
2619                         IWL_DEBUG_RATE(priv, "Switch current  mcs: %X index: %d\n",
2620                                      tbl->current_rate, index);
2621                         rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2622                         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2623                 } else
2624                         done_search = 1;
2625         }
2626
2627         if (done_search && !lq_sta->stay_in_tbl) {
2628                 /* If the "active" (non-search) mode was legacy,
2629                  * and we've tried switching antennas,
2630                  * but we haven't been able to try HT modes (not available),
2631                  * stay with best antenna legacy modulation for a while
2632                  * before next round of mode comparisons. */
2633                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2634                 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2635                     lq_sta->action_counter > tbl1->max_search) {
2636                         IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2637                         rs_set_stay_in_table(priv, 1, lq_sta);
2638                 }
2639
2640                 /* If we're in an HT mode, and all 3 mode switch actions
2641                  * have been tried and compared, stay in this best modulation
2642                  * mode for a while before next round of mode comparisons. */
2643                 if (lq_sta->enable_counter &&
2644                     (lq_sta->action_counter >= tbl1->max_search) &&
2645                     iwl_ht_enabled(priv)) {
2646                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2647                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2648                             (tid != MAX_TID_COUNT)) {
2649                                 tid_data =
2650                                    &priv->stations[lq_sta->lq.sta_id].tid[tid];
2651                                 if (tid_data->agg.state == IWL_AGG_OFF) {
2652                                         IWL_DEBUG_RATE(priv,
2653                                                        "try to aggregate tid %d\n",
2654                                                        tid);
2655                                         rs_tl_turn_on_agg(priv, tid,
2656                                                           lq_sta, sta);
2657                                 }
2658                         }
2659                         rs_set_stay_in_table(priv, 0, lq_sta);
2660                 }
2661         }
2662
2663 out:
2664         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2665         i = index;
2666         lq_sta->last_txrate_idx = i;
2667 }
2668
2669 /**
2670  * rs_initialize_lq - Initialize a station's hardware rate table
2671  *
2672  * The uCode's station table contains a table of fallback rates
2673  * for automatic fallback during transmission.
2674  *
2675  * NOTE: This sets up a default set of values.  These will be replaced later
2676  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2677  *       rc80211_simple.
2678  *
2679  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2680  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2681  *       which requires station table entry to exist).
2682  */
2683 static void rs_initialize_lq(struct iwl_priv *priv,
2684                              struct ieee80211_conf *conf,
2685                              struct ieee80211_sta *sta,
2686                              struct iwl_lq_sta *lq_sta)
2687 {
2688         struct iwl_scale_tbl_info *tbl;
2689         int rate_idx;
2690         int i;
2691         u32 rate;
2692         u8 use_green = rs_use_green(sta);
2693         u8 active_tbl = 0;
2694         u8 valid_tx_ant;
2695         struct iwl_station_priv *sta_priv;
2696         struct iwl_rxon_context *ctx;
2697
2698         if (!sta || !lq_sta)
2699                 return;
2700
2701         sta_priv = (void *)sta->drv_priv;
2702         ctx = sta_priv->common.ctx;
2703
2704         i = lq_sta->last_txrate_idx;
2705
2706         valid_tx_ant = priv->hw_params.valid_tx_ant;
2707
2708         if (!lq_sta->search_better_tbl)
2709                 active_tbl = lq_sta->active_tbl;
2710         else
2711                 active_tbl = 1 - lq_sta->active_tbl;
2712
2713         tbl = &(lq_sta->lq_info[active_tbl]);
2714
2715         if ((i < 0) || (i >= IWL_RATE_COUNT))
2716                 i = 0;
2717
2718         rate = iwl_rates[i].plcp;
2719         tbl->ant_type = first_antenna(valid_tx_ant);
2720         rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2721
2722         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2723                 rate |= RATE_MCS_CCK_MSK;
2724
2725         rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2726         if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2727             rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2728
2729         rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2730         tbl->current_rate = rate;
2731         rs_set_expected_tpt_table(lq_sta, tbl);
2732         rs_fill_link_cmd(NULL, lq_sta, rate);
2733         priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2734         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_SYNC, true);
2735 }
2736
2737 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2738                         struct ieee80211_tx_rate_control *txrc)
2739 {
2740
2741         struct sk_buff *skb = txrc->skb;
2742         struct ieee80211_supported_band *sband = txrc->sband;
2743         struct iwl_priv *priv __maybe_unused = (struct iwl_priv *)priv_r;
2744         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2745         struct iwl_lq_sta *lq_sta = priv_sta;
2746         int rate_idx;
2747
2748         IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2749
2750         /* Get max rate if user set max rate */
2751         if (lq_sta) {
2752                 lq_sta->max_rate_idx = txrc->max_rate_idx;
2753                 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2754                     (lq_sta->max_rate_idx != -1))
2755                         lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2756                 if ((lq_sta->max_rate_idx < 0) ||
2757                     (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2758                         lq_sta->max_rate_idx = -1;
2759         }
2760
2761         /* Treat uninitialized rate scaling data same as non-existing. */
2762         if (lq_sta && !lq_sta->drv) {
2763                 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
2764                 priv_sta = NULL;
2765         }
2766
2767         /* Send management frames and NO_ACK data using lowest rate. */
2768         if (rate_control_send_low(sta, priv_sta, txrc))
2769                 return;
2770
2771         rate_idx  = lq_sta->last_txrate_idx;
2772
2773         if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2774                 rate_idx -= IWL_FIRST_OFDM_RATE;
2775                 /* 6M and 9M shared same MCS index */
2776                 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2777                 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2778                     IWL_RATE_MIMO3_6M_PLCP)
2779                         rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2780                 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2781                          IWL_RATE_MIMO2_6M_PLCP)
2782                         rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2783                 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2784                 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2785                         info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2786                 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2787                         info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
2788                 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2789                         info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2790                 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2791                         info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2792         } else {
2793                 /* Check for invalid rates */
2794                 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2795                                 ((sband->band == IEEE80211_BAND_5GHZ) &&
2796                                  (rate_idx < IWL_FIRST_OFDM_RATE)))
2797                         rate_idx = rate_lowest_index(sband, sta);
2798                 /* On valid 5 GHz rate, adjust index */
2799                 else if (sband->band == IEEE80211_BAND_5GHZ)
2800                         rate_idx -= IWL_FIRST_OFDM_RATE;
2801                 info->control.rates[0].flags = 0;
2802         }
2803         info->control.rates[0].idx = rate_idx;
2804
2805 }
2806
2807 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2808                           gfp_t gfp)
2809 {
2810         struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2811         struct iwl_priv *priv;
2812
2813         priv = (struct iwl_priv *)priv_rate;
2814         IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2815
2816         return &sta_priv->lq_sta;
2817 }
2818
2819 /*
2820  * Called after adding a new station to initialize rate scaling
2821  */
2822 void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id)
2823 {
2824         int i, j;
2825         struct ieee80211_hw *hw = priv->hw;
2826         struct ieee80211_conf *conf = &priv->hw->conf;
2827         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2828         struct iwl_station_priv *sta_priv;
2829         struct iwl_lq_sta *lq_sta;
2830         struct ieee80211_supported_band *sband;
2831
2832         sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2833         lq_sta = &sta_priv->lq_sta;
2834         sband = hw->wiphy->bands[conf->channel->band];
2835
2836
2837         lq_sta->lq.sta_id = sta_id;
2838
2839         for (j = 0; j < LQ_SIZE; j++)
2840                 for (i = 0; i < IWL_RATE_COUNT; i++)
2841                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2842
2843         lq_sta->flush_timer = 0;
2844         lq_sta->supp_rates = sta->supp_rates[sband->band];
2845         for (j = 0; j < LQ_SIZE; j++)
2846                 for (i = 0; i < IWL_RATE_COUNT; i++)
2847                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2848
2849         IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n",
2850                        sta_id);
2851         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2852          * the lowest or the highest rate.. Could consider using RSSI from
2853          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2854          * after assoc.. */
2855
2856         lq_sta->is_dup = 0;
2857         lq_sta->max_rate_idx = -1;
2858         lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2859         lq_sta->is_green = rs_use_green(sta);
2860         lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2861         lq_sta->band = priv->band;
2862         /*
2863          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2864          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2865          */
2866         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2867         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2868         lq_sta->active_siso_rate &= ~((u16)0x2);
2869         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2870
2871         /* Same here */
2872         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2873         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2874         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2875         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2876
2877         lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2878         lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2879         lq_sta->active_mimo3_rate &= ~((u16)0x2);
2880         lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2881
2882         IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2883                      lq_sta->active_siso_rate,
2884                      lq_sta->active_mimo2_rate,
2885                      lq_sta->active_mimo3_rate);
2886
2887         /* These values will be overridden later */
2888         lq_sta->lq.general_params.single_stream_ant_msk =
2889                 first_antenna(priv->hw_params.valid_tx_ant);
2890         lq_sta->lq.general_params.dual_stream_ant_msk =
2891                 priv->hw_params.valid_tx_ant &
2892                 ~first_antenna(priv->hw_params.valid_tx_ant);
2893         if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2894                 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2895         } else if (num_of_ant(priv->hw_params.valid_tx_ant) == 2) {
2896                 lq_sta->lq.general_params.dual_stream_ant_msk =
2897                         priv->hw_params.valid_tx_ant;
2898         }
2899
2900         /* as default allow aggregation for all tids */
2901         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2902         lq_sta->drv = priv;
2903
2904         /* Set last_txrate_idx to lowest rate */
2905         lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2906         if (sband->band == IEEE80211_BAND_5GHZ)
2907                 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2908         lq_sta->is_agg = 0;
2909 #ifdef CONFIG_IWLWIFI_DEVICE_SVTOOL
2910         priv->tm_fixed_rate = 0;
2911 #endif
2912 #ifdef CONFIG_MAC80211_DEBUGFS
2913         lq_sta->dbg_fixed_rate = 0;
2914 #endif
2915
2916         rs_initialize_lq(priv, conf, sta, lq_sta);
2917 }
2918
2919 static void rs_fill_link_cmd(struct iwl_priv *priv,
2920                              struct iwl_lq_sta *lq_sta, u32 new_rate)
2921 {
2922         struct iwl_scale_tbl_info tbl_type;
2923         int index = 0;
2924         int rate_idx;
2925         int repeat_rate = 0;
2926         u8 ant_toggle_cnt = 0;
2927         u8 use_ht_possible = 1;
2928         u8 valid_tx_ant = 0;
2929         struct iwl_station_priv *sta_priv =
2930                 container_of(lq_sta, struct iwl_station_priv, lq_sta);
2931         struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2932
2933         /* Override starting rate (index 0) if needed for debug purposes */
2934         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2935
2936         /* Interpret new_rate (rate_n_flags) */
2937         rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2938                                   &tbl_type, &rate_idx);
2939
2940         if (priv && priv->bt_full_concurrent) {
2941                 /* 1x1 only */
2942                 tbl_type.ant_type =
2943                         first_antenna(priv->hw_params.valid_tx_ant);
2944         }
2945
2946         /* How many times should we repeat the initial rate? */
2947         if (is_legacy(tbl_type.lq_type)) {
2948                 ant_toggle_cnt = 1;
2949                 repeat_rate = IWL_NUMBER_TRY;
2950         } else {
2951                 repeat_rate = min(IWL_HT_NUMBER_TRY,
2952                                   LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2953         }
2954
2955         lq_cmd->general_params.mimo_delimiter =
2956                         is_mimo(tbl_type.lq_type) ? 1 : 0;
2957
2958         /* Fill 1st table entry (index 0) */
2959         lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2960
2961         if (num_of_ant(tbl_type.ant_type) == 1) {
2962                 lq_cmd->general_params.single_stream_ant_msk =
2963                                                 tbl_type.ant_type;
2964         } else if (num_of_ant(tbl_type.ant_type) == 2) {
2965                 lq_cmd->general_params.dual_stream_ant_msk =
2966                                                 tbl_type.ant_type;
2967         } /* otherwise we don't modify the existing value */
2968
2969         index++;
2970         repeat_rate--;
2971         if (priv) {
2972                 if (priv->bt_full_concurrent)
2973                         valid_tx_ant = ANT_A;
2974                 else
2975                         valid_tx_ant = priv->hw_params.valid_tx_ant;
2976         }
2977
2978         /* Fill rest of rate table */
2979         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2980                 /* Repeat initial/next rate.
2981                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2982                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2983                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2984                         if (is_legacy(tbl_type.lq_type)) {
2985                                 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2986                                         ant_toggle_cnt++;
2987                                 else if (priv &&
2988                                          rs_toggle_antenna(valid_tx_ant,
2989                                                         &new_rate, &tbl_type))
2990                                         ant_toggle_cnt = 1;
2991                         }
2992
2993                         /* Override next rate if needed for debug purposes */
2994                         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2995
2996                         /* Fill next table entry */
2997                         lq_cmd->rs_table[index].rate_n_flags =
2998                                         cpu_to_le32(new_rate);
2999                         repeat_rate--;
3000                         index++;
3001                 }
3002
3003                 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
3004                                                 &rate_idx);
3005
3006                 if (priv && priv->bt_full_concurrent) {
3007                         /* 1x1 only */
3008                         tbl_type.ant_type =
3009                                 first_antenna(priv->hw_params.valid_tx_ant);
3010                 }
3011
3012                 /* Indicate to uCode which entries might be MIMO.
3013                  * If initial rate was MIMO, this will finally end up
3014                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
3015                 if (is_mimo(tbl_type.lq_type))
3016                         lq_cmd->general_params.mimo_delimiter = index;
3017
3018                 /* Get next rate */
3019                 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
3020                                              use_ht_possible);
3021
3022                 /* How many times should we repeat the next rate? */
3023                 if (is_legacy(tbl_type.lq_type)) {
3024                         if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
3025                                 ant_toggle_cnt++;
3026                         else if (priv &&
3027                                  rs_toggle_antenna(valid_tx_ant,
3028                                                    &new_rate, &tbl_type))
3029                                 ant_toggle_cnt = 1;
3030
3031                         repeat_rate = IWL_NUMBER_TRY;
3032                 } else {
3033                         repeat_rate = IWL_HT_NUMBER_TRY;
3034                 }
3035
3036                 /* Don't allow HT rates after next pass.
3037                  * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
3038                 use_ht_possible = 0;
3039
3040                 /* Override next rate if needed for debug purposes */
3041                 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
3042
3043                 /* Fill next table entry */
3044                 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
3045
3046                 index++;
3047                 repeat_rate--;
3048         }
3049
3050         lq_cmd->agg_params.agg_frame_cnt_limit =
3051                 sta_priv->max_agg_bufsize ?: LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3052         lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
3053
3054         lq_cmd->agg_params.agg_time_limit =
3055                 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
3056         /*
3057          * overwrite if needed, pass aggregation time limit
3058          * to uCode in uSec
3059          */
3060         if (priv && priv->cfg->bt_params &&
3061             priv->cfg->bt_params->agg_time_limit &&
3062             priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH)
3063                 lq_cmd->agg_params.agg_time_limit =
3064                         cpu_to_le16(priv->cfg->bt_params->agg_time_limit);
3065 }
3066
3067 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3068 {
3069         return hw->priv;
3070 }
3071 /* rate scale requires free function to be implemented */
3072 static void rs_free(void *priv_rate)
3073 {
3074         return;
3075 }
3076
3077 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
3078                         void *priv_sta)
3079 {
3080         struct iwl_priv *priv __maybe_unused = priv_r;
3081
3082         IWL_DEBUG_RATE(priv, "enter\n");
3083         IWL_DEBUG_RATE(priv, "leave\n");
3084 }
3085
3086 #ifdef CONFIG_MAC80211_DEBUGFS
3087 static int open_file_generic(struct inode *inode, struct file *file)
3088 {
3089         file->private_data = inode->i_private;
3090         return 0;
3091 }
3092 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
3093                              u32 *rate_n_flags, int index)
3094 {
3095         struct iwl_priv *priv;
3096         u8 valid_tx_ant;
3097         u8 ant_sel_tx;
3098
3099         priv = lq_sta->drv;
3100         valid_tx_ant = priv->hw_params.valid_tx_ant;
3101         if (lq_sta->dbg_fixed_rate) {
3102                 ant_sel_tx =
3103                   ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
3104                   >> RATE_MCS_ANT_POS);
3105                 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
3106                         *rate_n_flags = lq_sta->dbg_fixed_rate;
3107                         IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
3108                 } else {
3109                         lq_sta->dbg_fixed_rate = 0;
3110                         IWL_ERR(priv,
3111                             "Invalid antenna selection 0x%X, Valid is 0x%X\n",
3112                             ant_sel_tx, valid_tx_ant);
3113                         IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3114                 }
3115         } else {
3116                 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3117         }
3118 }
3119
3120 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3121                         const char __user *user_buf, size_t count, loff_t *ppos)
3122 {
3123         struct iwl_lq_sta *lq_sta = file->private_data;
3124         struct iwl_priv *priv;
3125         char buf[64];
3126         size_t buf_size;
3127         u32 parsed_rate;
3128
3129
3130         priv = lq_sta->drv;
3131         memset(buf, 0, sizeof(buf));
3132         buf_size = min(count, sizeof(buf) -  1);
3133         if (copy_from_user(buf, user_buf, buf_size))
3134                 return -EFAULT;
3135
3136         if (sscanf(buf, "%x", &parsed_rate) == 1)
3137                 lq_sta->dbg_fixed_rate = parsed_rate;
3138         else
3139                 lq_sta->dbg_fixed_rate = 0;
3140
3141         rs_program_fix_rate(priv, lq_sta);
3142
3143         return count;
3144 }
3145
3146 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3147                         char __user *user_buf, size_t count, loff_t *ppos)
3148 {
3149         char *buff;
3150         int desc = 0;
3151         int i = 0;
3152         int index = 0;
3153         ssize_t ret;
3154
3155         struct iwl_lq_sta *lq_sta = file->private_data;
3156         struct iwl_priv *priv;
3157         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3158
3159         priv = lq_sta->drv;
3160         buff = kmalloc(1024, GFP_KERNEL);
3161         if (!buff)
3162                 return -ENOMEM;
3163
3164         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3165         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
3166                         lq_sta->total_failed, lq_sta->total_success,
3167                         lq_sta->active_legacy_rate);
3168         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3169                         lq_sta->dbg_fixed_rate);
3170         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3171             (priv->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
3172             (priv->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
3173             (priv->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
3174         desc += sprintf(buff+desc, "lq type %s\n",
3175            (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
3176         if (is_Ht(tbl->lq_type)) {
3177                 desc += sprintf(buff+desc, " %s",
3178                    (is_siso(tbl->lq_type)) ? "SISO" :
3179                    ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
3180                    desc += sprintf(buff+desc, " %s",
3181                    (tbl->is_ht40) ? "40MHz" : "20MHz");
3182                    desc += sprintf(buff+desc, " %s %s %s\n", (tbl->is_SGI) ? "SGI" : "",
3183                    (lq_sta->is_green) ? "GF enabled" : "",
3184                    (lq_sta->is_agg) ? "AGG on" : "");
3185         }
3186         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3187                 lq_sta->last_rate_n_flags);
3188         desc += sprintf(buff+desc, "general:"
3189                 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
3190                 lq_sta->lq.general_params.flags,
3191                 lq_sta->lq.general_params.mimo_delimiter,
3192                 lq_sta->lq.general_params.single_stream_ant_msk,
3193                 lq_sta->lq.general_params.dual_stream_ant_msk);
3194
3195         desc += sprintf(buff+desc, "agg:"
3196                         "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3197                         le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
3198                         lq_sta->lq.agg_params.agg_dis_start_th,
3199                         lq_sta->lq.agg_params.agg_frame_cnt_limit);
3200
3201         desc += sprintf(buff+desc,
3202                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3203                         lq_sta->lq.general_params.start_rate_index[0],
3204                         lq_sta->lq.general_params.start_rate_index[1],
3205                         lq_sta->lq.general_params.start_rate_index[2],
3206                         lq_sta->lq.general_params.start_rate_index[3]);
3207
3208         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3209                 index = iwl_hwrate_to_plcp_idx(
3210                         le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
3211                 if (is_legacy(tbl->lq_type)) {
3212                         desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
3213                                 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3214                                 iwl_rate_mcs[index].mbps);
3215                 } else {
3216                         desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
3217                                 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3218                                 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
3219                 }
3220         }
3221
3222         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3223         kfree(buff);
3224         return ret;
3225 }
3226
3227 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3228         .write = rs_sta_dbgfs_scale_table_write,
3229         .read = rs_sta_dbgfs_scale_table_read,
3230         .open = open_file_generic,
3231         .llseek = default_llseek,
3232 };
3233 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3234                         char __user *user_buf, size_t count, loff_t *ppos)
3235 {
3236         char *buff;
3237         int desc = 0;
3238         int i, j;
3239         ssize_t ret;
3240
3241         struct iwl_lq_sta *lq_sta = file->private_data;
3242
3243         buff = kmalloc(1024, GFP_KERNEL);
3244         if (!buff)
3245                 return -ENOMEM;
3246
3247         for (i = 0; i < LQ_SIZE; i++) {
3248                 desc += sprintf(buff+desc,
3249                                 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
3250                                 "rate=0x%X\n",
3251                                 lq_sta->active_tbl == i ? "*" : "x",
3252                                 lq_sta->lq_info[i].lq_type,
3253                                 lq_sta->lq_info[i].is_SGI,
3254                                 lq_sta->lq_info[i].is_ht40,
3255                                 lq_sta->lq_info[i].is_dup,
3256                                 lq_sta->is_green,
3257                                 lq_sta->lq_info[i].current_rate);
3258                 for (j = 0; j < IWL_RATE_COUNT; j++) {
3259                         desc += sprintf(buff+desc,
3260                                 "counter=%d success=%d %%=%d\n",
3261                                 lq_sta->lq_info[i].win[j].counter,
3262                                 lq_sta->lq_info[i].win[j].success_counter,
3263                                 lq_sta->lq_info[i].win[j].success_ratio);
3264                 }
3265         }
3266         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3267         kfree(buff);
3268         return ret;
3269 }
3270
3271 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3272         .read = rs_sta_dbgfs_stats_table_read,
3273         .open = open_file_generic,
3274         .llseek = default_llseek,
3275 };
3276
3277 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3278                         char __user *user_buf, size_t count, loff_t *ppos)
3279 {
3280         struct iwl_lq_sta *lq_sta = file->private_data;
3281         struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3282         char buff[120];
3283         int desc = 0;
3284
3285         if (is_Ht(tbl->lq_type))
3286                 desc += sprintf(buff+desc,
3287                                 "Bit Rate= %d Mb/s\n",
3288                                 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3289         else
3290                 desc += sprintf(buff+desc,
3291                                 "Bit Rate= %d Mb/s\n",
3292                                 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3293
3294         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3295 }
3296
3297 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3298         .read = rs_sta_dbgfs_rate_scale_data_read,
3299         .open = open_file_generic,
3300         .llseek = default_llseek,
3301 };
3302
3303 static void rs_add_debugfs(void *priv, void *priv_sta,
3304                                         struct dentry *dir)
3305 {
3306         struct iwl_lq_sta *lq_sta = priv_sta;
3307         lq_sta->rs_sta_dbgfs_scale_table_file =
3308                 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3309                                 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3310         lq_sta->rs_sta_dbgfs_stats_table_file =
3311                 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3312                         lq_sta, &rs_sta_dbgfs_stats_table_ops);
3313         lq_sta->rs_sta_dbgfs_rate_scale_data_file =
3314                 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
3315                         lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
3316         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
3317                 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3318                 &lq_sta->tx_agg_tid_en);
3319
3320 }
3321
3322 static void rs_remove_debugfs(void *priv, void *priv_sta)
3323 {
3324         struct iwl_lq_sta *lq_sta = priv_sta;
3325         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3326         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
3327         debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
3328         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
3329 }
3330 #endif
3331
3332 /*
3333  * Initialization of rate scaling information is done by driver after
3334  * the station is added. Since mac80211 calls this function before a
3335  * station is added we ignore it.
3336  */
3337 static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband,
3338                          struct ieee80211_sta *sta, void *priv_sta)
3339 {
3340 }
3341 static struct rate_control_ops rs_ops = {
3342         .module = NULL,
3343         .name = RS_NAME,
3344         .tx_status = rs_tx_status,
3345         .get_rate = rs_get_rate,
3346         .rate_init = rs_rate_init_stub,
3347         .alloc = rs_alloc,
3348         .free = rs_free,
3349         .alloc_sta = rs_alloc_sta,
3350         .free_sta = rs_free_sta,
3351 #ifdef CONFIG_MAC80211_DEBUGFS
3352         .add_sta_debugfs = rs_add_debugfs,
3353         .remove_sta_debugfs = rs_remove_debugfs,
3354 #endif
3355 };
3356
3357 int iwlagn_rate_control_register(void)
3358 {
3359         return ieee80211_rate_control_register(&rs_ops);
3360 }
3361
3362 void iwlagn_rate_control_unregister(void)
3363 {
3364         ieee80211_rate_control_unregister(&rs_ops);
3365 }
3366