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

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