drivers/net/wireless/iwlegacy/iwl-4965-rs.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2011 Intel Corporation. All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  * Contact Information:
  22  *  Intel Linux Wireless <ilw@linux.intel.com>
  23  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  24  *
  25  *****************************************************************************/
  26 #include <linux/kernel.h>
  27 #include <linux/init.h>
  28 #include <linux/skbuff.h>
  29 #include <linux/slab.h>
  30 #include <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-4965.h"
  43
  44 #define IWL4965_RS_NAME "iwl-4965-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_##r##M_IEEE,      \
  85                                     IWL_RATE_##ip##M_INDEX,    \
  86                                     IWL_RATE_##in##M_INDEX,    \
  87                                     IWL_RATE_##rp##M_INDEX,    \
  88                                     IWL_RATE_##rn##M_INDEX,    \
  89                                     IWL_RATE_##pp##M_INDEX,    \
  90                                     IWL_RATE_##np##M_INDEX }
  91
  92 /*
  93  * Parameter order:
  94  *   rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
  95  *
  96  * If there isn't a valid next or previous rate then INV is used which
  97  * maps to IWL_RATE_INVALID
  98  *
  99  */
 100 const struct iwl_rate_info iwlegacy_rates[IWL_RATE_COUNT] = {
 101         IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2),    /*  1mbps */
 102         IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5),          /*  2mbps */
 103         IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11),        /*5.5mbps */
 104         IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18),      /* 11mbps */
 105         IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11),        /*  6mbps */
 106         IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11),       /*  9mbps */
 107         IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18),   /* 12mbps */
 108         IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24),   /* 18mbps */
 109         IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36),   /* 24mbps */
 110         IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48),   /* 36mbps */
 111         IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54),   /* 48mbps */
 112         IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
 113         IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
 114 };
 115
 116 static int iwl4965_hwrate_to_plcp_idx(u32 rate_n_flags)
 117 {
 118         int idx = 0;
 119
 120         /* HT rate format */
 121         if (rate_n_flags & RATE_MCS_HT_MSK) {
 122                 idx = (rate_n_flags & 0xff);
 123
 124                 if (idx >= IWL_RATE_MIMO2_6M_PLCP)
 125                         idx = idx - IWL_RATE_MIMO2_6M_PLCP;
 126
 127                 idx += IWL_FIRST_OFDM_RATE;
 128                 /* skip 9M not supported in ht*/
 129                 if (idx >= IWL_RATE_9M_INDEX)
 130                         idx += 1;
 131                 if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE))
 132                         return idx;
 133
 134         /* legacy rate format, search for match in table */
 135         } else {
 136                 for (idx = 0; idx < ARRAY_SIZE(iwlegacy_rates); idx++)
 137                         if (iwlegacy_rates[idx].plcp == (rate_n_flags & 0xFF))
 138                                 return idx;
 139         }
 140
 141         return -1;
 142 }
 143
 144 static void iwl4965_rs_rate_scale_perform(struct iwl_priv *priv,
 145                                    struct sk_buff *skb,
 146                                    struct ieee80211_sta *sta,
 147                                    struct iwl_lq_sta *lq_sta);
 148 static void iwl4965_rs_fill_link_cmd(struct iwl_priv *priv,
 149                              struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
 150 static void iwl4965_rs_stay_in_table(struct iwl_lq_sta *lq_sta,
 151                                         bool force_search);
 152
 153 #ifdef CONFIG_MAC80211_DEBUGFS
 154 static void iwl4965_rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 155                              u32 *rate_n_flags, int index);
 156 #else
 157 static void iwl4965_rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 158                              u32 *rate_n_flags, int index)
 159 {}
 160 #endif
 161
 162 /**
 163  * The following tables contain the expected throughput metrics for all rates
 164  *
 165  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 166  *
 167  * where invalid entries are zeros.
 168  *
 169  * CCK rates are only valid in legacy table and will only be used in G
 170  * (2.4 GHz) band.
 171  */
 172
 173 static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
 174         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
 175 };
 176
 177 static s32 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
 178         {0, 0, 0, 0, 42, 0,  76, 102, 124, 158, 183, 193, 202}, /* Norm */
 179         {0, 0, 0, 0, 46, 0,  82, 110, 132, 167, 192, 202, 210}, /* SGI */
 180         {0, 0, 0, 0, 48, 0,  93, 135, 176, 251, 319, 351, 381}, /* AGG */
 181         {0, 0, 0, 0, 53, 0, 102, 149, 193, 275, 348, 381, 413}, /* AGG+SGI */
 182 };
 183
 184 static s32 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
 185         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
 186         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
 187         {0, 0, 0, 0,  96, 0, 182, 259, 328, 451, 553, 598, 640}, /* AGG */
 188         {0, 0, 0, 0, 106, 0, 199, 282, 357, 487, 593, 640, 683}, /* AGG+SGI */
 189 };
 190
 191 static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 192         {0, 0, 0, 0,  74, 0, 123, 155, 179, 213, 235, 243, 250}, /* Norm */
 193         {0, 0, 0, 0,  81, 0, 131, 164, 187, 221, 242, 250, 256}, /* SGI */
 194         {0, 0, 0, 0,  92, 0, 175, 250, 317, 436, 534, 578, 619}, /* AGG */
 195         {0, 0, 0, 0, 102, 0, 192, 273, 344, 470, 573, 619, 660}, /* AGG+SGI*/
 196 };
 197
 198 static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 199         {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
 200         {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
 201         {0, 0, 0, 0, 180, 0, 327, 446, 545, 708, 828, 878, 922}, /* AGG */
 202         {0, 0, 0, 0, 197, 0, 355, 481, 584, 752, 872, 922, 966}, /* AGG+SGI */
 203 };
 204
 205 /* mbps, mcs */
 206 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 207         {  "1", "BPSK DSSS"},
 208         {  "2", "QPSK DSSS"},
 209         {"5.5", "BPSK CCK"},
 210         { "11", "QPSK CCK"},
 211         {  "6", "BPSK 1/2"},
 212         {  "9", "BPSK 1/2"},
 213         { "12", "QPSK 1/2"},
 214         { "18", "QPSK 3/4"},
 215         { "24", "16QAM 1/2"},
 216         { "36", "16QAM 3/4"},
 217         { "48", "64QAM 2/3"},
 218         { "54", "64QAM 3/4"},
 219         { "60", "64QAM 5/6"},
 220 };
 221
 222 #define MCS_INDEX_PER_STREAM    (8)
 223
 224 static inline u8 iwl4965_rs_extract_rate(u32 rate_n_flags)
 225 {
 226         return (u8)(rate_n_flags & 0xFF);
 227 }
 228
 229 static void
 230 iwl4965_rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 231 {
 232         window->data = 0;
 233         window->success_counter = 0;
 234         window->success_ratio = IWL_INVALID_VALUE;
 235         window->counter = 0;
 236         window->average_tpt = IWL_INVALID_VALUE;
 237         window->stamp = 0;
 238 }
 239
 240 static inline u8 iwl4965_rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 241 {
 242         return (ant_type & valid_antenna) == ant_type;
 243 }
 244
 245 /*
 246  *      removes the old data from the statistics. All data that is older than
 247  *      TID_MAX_TIME_DIFF, will be deleted.
 248  */
 249 static void
 250 iwl4965_rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
 251 {
 252         /* The oldest age we want to keep */
 253         u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
 254
 255         while (tl->queue_count &&
 256                (tl->time_stamp < oldest_time)) {
 257                 tl->total -= tl->packet_count[tl->head];
 258                 tl->packet_count[tl->head] = 0;
 259                 tl->time_stamp += TID_QUEUE_CELL_SPACING;
 260                 tl->queue_count--;
 261                 tl->head++;
 262                 if (tl->head >= TID_QUEUE_MAX_SIZE)
 263                         tl->head = 0;
 264         }
 265 }
 266
 267 /*
 268  *      increment traffic load value for tid and also remove
 269  *      any old values if passed the certain time period
 270  */
 271 static u8 iwl4965_rs_tl_add_packet(struct iwl_lq_sta *lq_data,
 272                            struct ieee80211_hdr *hdr)
 273 {
 274         u32 curr_time = jiffies_to_msecs(jiffies);
 275         u32 time_diff;
 276         s32 index;
 277         struct iwl_traffic_load *tl = NULL;
 278         u8 tid;
 279
 280         if (ieee80211_is_data_qos(hdr->frame_control)) {
 281                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 282                 tid = qc[0] & 0xf;
 283         } else
 284                 return MAX_TID_COUNT;
 285
 286         if (unlikely(tid >= TID_MAX_LOAD_COUNT))
 287                 return MAX_TID_COUNT;
 288
 289         tl = &lq_data->load[tid];
 290
 291         curr_time -= curr_time % TID_ROUND_VALUE;
 292
 293         /* Happens only for the first packet. Initialize the data */
 294         if (!(tl->queue_count)) {
 295                 tl->total = 1;
 296                 tl->time_stamp = curr_time;
 297                 tl->queue_count = 1;
 298                 tl->head = 0;
 299                 tl->packet_count[0] = 1;
 300                 return MAX_TID_COUNT;
 301         }
 302
 303         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 304         index = time_diff / TID_QUEUE_CELL_SPACING;
 305
 306         /* The history is too long: remove data that is older than */
 307         /* TID_MAX_TIME_DIFF */
 308         if (index >= TID_QUEUE_MAX_SIZE)
 309                 iwl4965_rs_tl_rm_old_stats(tl, curr_time);
 310
 311         index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
 312         tl->packet_count[index] = tl->packet_count[index] + 1;
 313         tl->total = tl->total + 1;
 314
 315         if ((index + 1) > tl->queue_count)
 316                 tl->queue_count = index + 1;
 317
 318         return tid;
 319 }
 320
 321 /*
 322         get the traffic load value for tid
 323 */
 324 static u32 iwl4965_rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
 325 {
 326         u32 curr_time = jiffies_to_msecs(jiffies);
 327         u32 time_diff;
 328         s32 index;
 329         struct iwl_traffic_load *tl = NULL;
 330
 331         if (tid >= TID_MAX_LOAD_COUNT)
 332                 return 0;
 333
 334         tl = &(lq_data->load[tid]);
 335
 336         curr_time -= curr_time % TID_ROUND_VALUE;
 337
 338         if (!(tl->queue_count))
 339                 return 0;
 340
 341         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 342         index = time_diff / TID_QUEUE_CELL_SPACING;
 343
 344         /* The history is too long: remove data that is older than */
 345         /* TID_MAX_TIME_DIFF */
 346         if (index >= TID_QUEUE_MAX_SIZE)
 347                 iwl4965_rs_tl_rm_old_stats(tl, curr_time);
 348
 349         return tl->total;
 350 }
 351
 352 static int iwl4965_rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
 353                                       struct iwl_lq_sta *lq_data, u8 tid,
 354                                       struct ieee80211_sta *sta)
 355 {
 356         int ret = -EAGAIN;
 357         u32 load;
 358
 359         load = iwl4965_rs_tl_get_load(lq_data, tid);
 360
 361         if (load > IWL_AGG_LOAD_THRESHOLD) {
 362                 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
 363                                 sta->addr, tid);
 364                 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
 365                 if (ret == -EAGAIN) {
 366                         /*
 367                          * driver and mac80211 is out of sync
 368                          * this might be cause by reloading firmware
 369                          * stop the tx ba session here
 370                          */
 371                         IWL_ERR(priv, "Fail start Tx agg on tid: %d\n",
 372                                 tid);
 373                         ieee80211_stop_tx_ba_session(sta, tid);
 374                 }
 375         } else {
 376                 IWL_ERR(priv, "Aggregation not enabled for tid %d "
 377                         "because load = %u\n", tid, load);
 378         }
 379         return ret;
 380 }
 381
 382 static void iwl4965_rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
 383                               struct iwl_lq_sta *lq_data,
 384                               struct ieee80211_sta *sta)
 385 {
 386         if (tid < TID_MAX_LOAD_COUNT)
 387                 iwl4965_rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 388         else
 389                 IWL_ERR(priv, "tid exceeds max load count: %d/%d\n",
 390                         tid, TID_MAX_LOAD_COUNT);
 391 }
 392
 393 static inline int iwl4965_get_iwl4965_num_of_ant_from_rate(u32 rate_n_flags)
 394 {
 395         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 396                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 397                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 398 }
 399
 400 /*
 401  * Static function to get the expected throughput from an iwl_scale_tbl_info
 402  * that wraps a NULL pointer check
 403  */
 404 static s32
 405 iwl4965_get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 406 {
 407         if (tbl->expected_tpt)
 408                 return tbl->expected_tpt[rs_index];
 409         return 0;
 410 }
 411
 412 /**
 413  * iwl4965_rs_collect_tx_data - Update the success/failure sliding window
 414  *
 415  * We keep a sliding window of the last 62 packets transmitted
 416  * at this rate.  window->data contains the bitmask of successful
 417  * packets.
 418  */
 419 static int iwl4965_rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
 420                               int scale_index, int attempts, int successes)
 421 {
 422         struct iwl_rate_scale_data *window = NULL;
 423         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 424         s32 fail_count, tpt;
 425
 426         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 427                 return -EINVAL;
 428
 429         /* Select window for current tx bit rate */
 430         window = &(tbl->win[scale_index]);
 431
 432         /* Get expected throughput */
 433         tpt = iwl4965_get_expected_tpt(tbl, scale_index);
 434
 435         /*
 436          * Keep track of only the latest 62 tx frame attempts in this rate's
 437          * history window; anything older isn't really relevant any more.
 438          * If we have filled up the sliding window, drop the oldest attempt;
 439          * if the oldest attempt (highest bit in bitmap) shows "success",
 440          * subtract "1" from the success counter (this is the main reason
 441          * we keep these bitmaps!).
 442          */
 443         while (attempts > 0) {
 444                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 445
 446                         /* remove earliest */
 447                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 448
 449                         if (window->data & mask) {
 450                                 window->data &= ~mask;
 451                                 window->success_counter--;
 452                         }
 453                 }
 454
 455                 /* Increment frames-attempted counter */
 456                 window->counter++;
 457
 458                 /* Shift bitmap by one frame to throw away oldest history */
 459                 window->data <<= 1;
 460
 461                 /* Mark the most recent #successes attempts as successful */
 462                 if (successes > 0) {
 463                         window->success_counter++;
 464                         window->data |= 0x1;
 465                         successes--;
 466                 }
 467
 468                 attempts--;
 469         }
 470
 471         /* Calculate current success ratio, avoid divide-by-0! */
 472         if (window->counter > 0)
 473                 window->success_ratio = 128 * (100 * window->success_counter)
 474                                         / window->counter;
 475         else
 476                 window->success_ratio = IWL_INVALID_VALUE;
 477
 478         fail_count = window->counter - window->success_counter;
 479
 480         /* Calculate average throughput, if we have enough history. */
 481         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 482             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 483                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 484         else
 485                 window->average_tpt = IWL_INVALID_VALUE;
 486
 487         /* Tag this window as having been updated */
 488         window->stamp = jiffies;
 489
 490         return 0;
 491 }
 492
 493 /*
 494  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
 495  */
 496 static u32 iwl4965_rate_n_flags_from_tbl(struct iwl_priv *priv,
 497                                  struct iwl_scale_tbl_info *tbl,
 498                                  int index, u8 use_green)
 499 {
 500         u32 rate_n_flags = 0;
 501
 502         if (is_legacy(tbl->lq_type)) {
 503                 rate_n_flags = iwlegacy_rates[index].plcp;
 504                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 505                         rate_n_flags |= RATE_MCS_CCK_MSK;
 506
 507         } else if (is_Ht(tbl->lq_type)) {
 508                 if (index > IWL_LAST_OFDM_RATE) {
 509                         IWL_ERR(priv, "Invalid HT rate index %d\n", index);
 510                         index = IWL_LAST_OFDM_RATE;
 511                 }
 512                 rate_n_flags = RATE_MCS_HT_MSK;
 513
 514                 if (is_siso(tbl->lq_type))
 515                         rate_n_flags |= iwlegacy_rates[index].plcp_siso;
 516                 else
 517                         rate_n_flags |= iwlegacy_rates[index].plcp_mimo2;
 518         } else {
 519                 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
 520         }
 521
 522         rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
 523                                                      RATE_MCS_ANT_ABC_MSK);
 524
 525         if (is_Ht(tbl->lq_type)) {
 526                 if (tbl->is_ht40) {
 527                         if (tbl->is_dup)
 528                                 rate_n_flags |= RATE_MCS_DUP_MSK;
 529                         else
 530                                 rate_n_flags |= RATE_MCS_HT40_MSK;
 531                 }
 532                 if (tbl->is_SGI)
 533                         rate_n_flags |= RATE_MCS_SGI_MSK;
 534
 535                 if (use_green) {
 536                         rate_n_flags |= RATE_MCS_GF_MSK;
 537                         if (is_siso(tbl->lq_type) && tbl->is_SGI) {
 538                                 rate_n_flags &= ~RATE_MCS_SGI_MSK;
 539                                 IWL_ERR(priv, "GF was set with SGI:SISO\n");
 540                         }
 541                 }
 542         }
 543         return rate_n_flags;
 544 }
 545
 546 /*
 547  * Interpret uCode API's rate_n_flags format,
 548  * fill "search" or "active" tx mode table.
 549  */
 550 static int iwl4965_rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
 551                                     enum ieee80211_band band,
 552                                     struct iwl_scale_tbl_info *tbl,
 553                                     int *rate_idx)
 554 {
 555         u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
 556         u8 iwl4965_num_of_ant = iwl4965_get_iwl4965_num_of_ant_from_rate(rate_n_flags);
 557         u8 mcs;
 558
 559         memset(tbl, 0, sizeof(struct iwl_scale_tbl_info));
 560         *rate_idx = iwl4965_hwrate_to_plcp_idx(rate_n_flags);
 561
 562         if (*rate_idx  == IWL_RATE_INVALID) {
 563                 *rate_idx = -1;
 564                 return -EINVAL;
 565         }
 566         tbl->is_SGI = 0;        /* default legacy setup */
 567         tbl->is_ht40 = 0;
 568         tbl->is_dup = 0;
 569         tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
 570         tbl->lq_type = LQ_NONE;
 571         tbl->max_search = IWL_MAX_SEARCH;
 572
 573         /* legacy rate format */
 574         if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
 575                 if (iwl4965_num_of_ant == 1) {
 576                         if (band == IEEE80211_BAND_5GHZ)
 577                                 tbl->lq_type = LQ_A;
 578                         else
 579                                 tbl->lq_type = LQ_G;
 580                 }
 581         /* HT rate format */
 582         } else {
 583                 if (rate_n_flags & RATE_MCS_SGI_MSK)
 584                         tbl->is_SGI = 1;
 585
 586                 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
 587                     (rate_n_flags & RATE_MCS_DUP_MSK))
 588                         tbl->is_ht40 = 1;
 589
 590                 if (rate_n_flags & RATE_MCS_DUP_MSK)
 591                         tbl->is_dup = 1;
 592
 593                 mcs = iwl4965_rs_extract_rate(rate_n_flags);
 594
 595                 /* SISO */
 596                 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
 597                         if (iwl4965_num_of_ant == 1)
 598                                 tbl->lq_type = LQ_SISO; /*else NONE*/
 599                 /* MIMO2 */
 600                 } else {
 601                         if (iwl4965_num_of_ant == 2)
 602                                 tbl->lq_type = LQ_MIMO2;
 603                 }
 604         }
 605         return 0;
 606 }
 607
 608 /* switch to another antenna/antennas and return 1 */
 609 /* if no other valid antenna found, return 0 */
 610 static int iwl4965_rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
 611                              struct iwl_scale_tbl_info *tbl)
 612 {
 613         u8 new_ant_type;
 614
 615         if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
 616                 return 0;
 617
 618         if (!iwl4965_rs_is_valid_ant(valid_ant, tbl->ant_type))
 619                 return 0;
 620
 621         new_ant_type = ant_toggle_lookup[tbl->ant_type];
 622
 623         while ((new_ant_type != tbl->ant_type) &&
 624                !iwl4965_rs_is_valid_ant(valid_ant, new_ant_type))
 625                 new_ant_type = ant_toggle_lookup[new_ant_type];
 626
 627         if (new_ant_type == tbl->ant_type)
 628                 return 0;
 629
 630         tbl->ant_type = new_ant_type;
 631         *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
 632         *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
 633         return 1;
 634 }
 635
 636 /**
 637  * Green-field mode is valid if the station supports it and
 638  * there are no non-GF stations present in the BSS.
 639  */
 640 static bool iwl4965_rs_use_green(struct ieee80211_sta *sta)
 641 {
 642         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
 643         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
 644
 645         return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
 646                 !(ctx->ht.non_gf_sta_present);
 647 }
 648
 649 /**
 650  * iwl4965_rs_get_supported_rates - get the available rates
 651  *
 652  * if management frame or broadcast frame only return
 653  * basic available rates.
 654  *
 655  */
 656 static u16 iwl4965_rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 657                                   struct ieee80211_hdr *hdr,
 658                                   enum iwl_table_type rate_type)
 659 {
 660         if (is_legacy(rate_type)) {
 661                 return lq_sta->active_legacy_rate;
 662         } else {
 663                 if (is_siso(rate_type))
 664                         return lq_sta->active_siso_rate;
 665                 else
 666                         return lq_sta->active_mimo2_rate;
 667         }
 668 }
 669
 670 static u16
 671 iwl4965_rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
 672                                 int rate_type)
 673 {
 674         u8 high = IWL_RATE_INVALID;
 675         u8 low = IWL_RATE_INVALID;
 676
 677         /* 802.11A or ht walks to the next literal adjacent rate in
 678          * the rate table */
 679         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 680                 int i;
 681                 u32 mask;
 682
 683                 /* Find the previous rate that is in the rate mask */
 684                 i = index - 1;
 685                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 686                         if (rate_mask & mask) {
 687                                 low = i;
 688                                 break;
 689                         }
 690                 }
 691
 692                 /* Find the next rate that is in the rate mask */
 693                 i = index + 1;
 694                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 695                         if (rate_mask & mask) {
 696                                 high = i;
 697                                 break;
 698                         }
 699                 }
 700
 701                 return (high << 8) | low;
 702         }
 703
 704         low = index;
 705         while (low != IWL_RATE_INVALID) {
 706                 low = iwlegacy_rates[low].prev_rs;
 707                 if (low == IWL_RATE_INVALID)
 708                         break;
 709                 if (rate_mask & (1 << low))
 710                         break;
 711                 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
 712         }
 713
 714         high = index;
 715         while (high != IWL_RATE_INVALID) {
 716                 high = iwlegacy_rates[high].next_rs;
 717                 if (high == IWL_RATE_INVALID)
 718                         break;
 719                 if (rate_mask & (1 << high))
 720                         break;
 721                 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
 722         }
 723
 724         return (high << 8) | low;
 725 }
 726
 727 static u32 iwl4965_rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
 728                              struct iwl_scale_tbl_info *tbl,
 729                              u8 scale_index, u8 ht_possible)
 730 {
 731         s32 low;
 732         u16 rate_mask;
 733         u16 high_low;
 734         u8 switch_to_legacy = 0;
 735         u8 is_green = lq_sta->is_green;
 736         struct iwl_priv *priv = lq_sta->drv;
 737
 738         /* check if we need to switch from HT to legacy rates.
 739          * assumption is that mandatory rates (1Mbps or 6Mbps)
 740          * are always supported (spec demand) */
 741         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
 742                 switch_to_legacy = 1;
 743                 scale_index = rs_ht_to_legacy[scale_index];
 744                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 745                         tbl->lq_type = LQ_A;
 746                 else
 747                         tbl->lq_type = LQ_G;
 748
 749                 if (iwl4965_num_of_ant(tbl->ant_type) > 1)
 750                         tbl->ant_type =
 751                                 iwl4965_first_antenna(priv->hw_params.valid_tx_ant);
 752
 753                 tbl->is_ht40 = 0;
 754                 tbl->is_SGI = 0;
 755                 tbl->max_search = IWL_MAX_SEARCH;
 756         }
 757
 758         rate_mask = iwl4965_rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
 759
 760         /* Mask with station rate restriction */
 761         if (is_legacy(tbl->lq_type)) {
 762                 /* supp_rates has no CCK bits in A mode */
 763                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 764                         rate_mask  = (u16)(rate_mask &
 765                            (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
 766                 else
 767                         rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
 768         }
 769
 770         /* If we switched from HT to legacy, check current rate */
 771         if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
 772                 low = scale_index;
 773                 goto out;
 774         }
 775
 776         high_low = iwl4965_rs_get_adjacent_rate(lq_sta->drv,
 777                                         scale_index, rate_mask,
 778                                         tbl->lq_type);
 779         low = high_low & 0xff;
 780
 781         if (low == IWL_RATE_INVALID)
 782                 low = scale_index;
 783
 784 out:
 785         return iwl4965_rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
 786 }
 787
 788 /*
 789  * Simple function to compare two rate scale table types
 790  */
 791 static bool iwl4965_table_type_matches(struct iwl_scale_tbl_info *a,
 792                                struct iwl_scale_tbl_info *b)
 793 {
 794         return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
 795                 (a->is_SGI == b->is_SGI);
 796 }
 797
 798 /*
 799  * mac80211 sends us Tx status
 800  */
 801 static void
 802 iwl4965_rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
 803                          struct ieee80211_sta *sta, void *priv_sta,
 804                          struct sk_buff *skb)
 805 {
 806         int legacy_success;
 807         int retries;
 808         int rs_index, mac_index, i;
 809         struct iwl_lq_sta *lq_sta = priv_sta;
 810         struct iwl_link_quality_cmd *table;
 811         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 812         struct iwl_priv *priv = (struct iwl_priv *)priv_r;
 813         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 814         enum mac80211_rate_control_flags mac_flags;
 815         u32 tx_rate;
 816         struct iwl_scale_tbl_info tbl_type;
 817         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
 818         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
 819         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
 820
 821         IWL_DEBUG_RATE_LIMIT(priv,
 822                 "get frame ack response, update rate scale window\n");
 823
 824         /* Treat uninitialized rate scaling data same as non-existing. */
 825         if (!lq_sta) {
 826                 IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n");
 827                 return;
 828         } else if (!lq_sta->drv) {
 829                 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
 830                 return;
 831         }
 832
 833         if (!ieee80211_is_data(hdr->frame_control) ||
 834             info->flags & IEEE80211_TX_CTL_NO_ACK)
 835                 return;
 836
 837         /* This packet was aggregated but doesn't carry status info */
 838         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 839             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 840                 return;
 841
 842         /*
 843          * Ignore this Tx frame response if its initial rate doesn't match
 844          * that of latest Link Quality command.  There may be stragglers
 845          * from a previous Link Quality command, but we're no longer interested
 846          * in those; they're either from the "active" mode while we're trying
 847          * to check "search" mode, or a prior "search" mode after we've moved
 848          * to a new "search" mode (which might become the new "active" mode).
 849          */
 850         table = &lq_sta->lq;
 851         tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
 852         iwl4965_rs_get_tbl_info_from_mcs(tx_rate,
 853                          priv->band, &tbl_type, &rs_index);
 854         if (priv->band == IEEE80211_BAND_5GHZ)
 855                 rs_index -= IWL_FIRST_OFDM_RATE;
 856         mac_flags = info->status.rates[0].flags;
 857         mac_index = info->status.rates[0].idx;
 858         /* For HT packets, map MCS to PLCP */
 859         if (mac_flags & IEEE80211_TX_RC_MCS) {
 860                 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
 861                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
 862                         mac_index++;
 863                 /*
 864                  * mac80211 HT index is always zero-indexed; we need to move
 865                  * HT OFDM rates after CCK rates in 2.4 GHz band
 866                  */
 867                 if (priv->band == IEEE80211_BAND_2GHZ)
 868                         mac_index += IWL_FIRST_OFDM_RATE;
 869         }
 870         /* Here we actually compare this rate to the latest LQ command */
 871         if ((mac_index < 0) ||
 872             (tbl_type.is_SGI !=
 873                         !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
 874             (tbl_type.is_ht40 !=
 875                         !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
 876             (tbl_type.is_dup !=
 877                         !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
 878             (tbl_type.ant_type != info->antenna_sel_tx) ||
 879             (!!(tx_rate & RATE_MCS_HT_MSK) !=
 880                         !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
 881             (!!(tx_rate & RATE_MCS_GF_MSK) !=
 882                         !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
 883             (rs_index != mac_index)) {
 884                 IWL_DEBUG_RATE(priv,
 885                 "initial rate %d does not match %d (0x%x)\n",
 886                          mac_index, rs_index, tx_rate);
 887                 /*
 888                  * Since rates mis-match, the last LQ command may have failed.
 889                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
 890                  * ... driver.
 891                  */
 892                 lq_sta->missed_rate_counter++;
 893                 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
 894                         lq_sta->missed_rate_counter = 0;
 895                         iwl_legacy_send_lq_cmd(priv, ctx, &lq_sta->lq,
 896                                                         CMD_ASYNC, false);
 897                 }
 898                 /* Regardless, ignore this status info for outdated rate */
 899                 return;
 900         } else
 901                 /* Rate did match, so reset the missed_rate_counter */
 902                 lq_sta->missed_rate_counter = 0;
 903
 904         /* Figure out if rate scale algorithm is in active or search table */
 905         if (iwl4965_table_type_matches(&tbl_type,
 906                                 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
 907                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 908                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 909         } else if (iwl4965_table_type_matches(&tbl_type,
 910                                 &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
 911                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 912                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 913         } else {
 914                 IWL_DEBUG_RATE(priv,
 915                         "Neither active nor search matches tx rate\n");
 916                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 917                 IWL_DEBUG_RATE(priv, "active- lq:%x, ant:%x, SGI:%d\n",
 918                         tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
 919                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 920                 IWL_DEBUG_RATE(priv, "search- lq:%x, ant:%x, SGI:%d\n",
 921                         tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
 922                 IWL_DEBUG_RATE(priv, "actual- lq:%x, ant:%x, SGI:%d\n",
 923                         tbl_type.lq_type, tbl_type.ant_type, tbl_type.is_SGI);
 924                 /*
 925                  * no matching table found, let's by-pass the data collection
 926                  * and continue to perform rate scale to find the rate table
 927                  */
 928                 iwl4965_rs_stay_in_table(lq_sta, true);
 929                 goto done;
 930         }
 931
 932         /*
 933          * Updating the frame history depends on whether packets were
 934          * aggregated.
 935          *
 936          * For aggregation, all packets were transmitted at the same rate, the
 937          * first index into rate scale table.
 938          */
 939         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
 940                 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
 941                 iwl4965_rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
 942                                 &rs_index);
 943                 iwl4965_rs_collect_tx_data(curr_tbl, rs_index,
 944                                    info->status.ampdu_len,
 945                                    info->status.ampdu_ack_len);
 946
 947                 /* Update success/fail counts if not searching for new mode */
 948                 if (lq_sta->stay_in_tbl) {
 949                         lq_sta->total_success += info->status.ampdu_ack_len;
 950                         lq_sta->total_failed += (info->status.ampdu_len -
 951                                         info->status.ampdu_ack_len);
 952                 }
 953         } else {
 954         /*
 955          * For legacy, update frame history with for each Tx retry.
 956          */
 957                 retries = info->status.rates[0].count - 1;
 958                 /* HW doesn't send more than 15 retries */
 959                 retries = min(retries, 15);
 960
 961                 /* The last transmission may have been successful */
 962                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
 963                 /* Collect data for each rate used during failed TX attempts */
 964                 for (i = 0; i <= retries; ++i) {
 965                         tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
 966                         iwl4965_rs_get_tbl_info_from_mcs(tx_rate, priv->band,
 967                                         &tbl_type, &rs_index);
 968                         /*
 969                          * Only collect stats if retried rate is in the same RS
 970                          * table as active/search.
 971                          */
 972                         if (iwl4965_table_type_matches(&tbl_type, curr_tbl))
 973                                 tmp_tbl = curr_tbl;
 974                         else if (iwl4965_table_type_matches(&tbl_type,
 975                                                                  other_tbl))
 976                                 tmp_tbl = other_tbl;
 977                         else
 978                                 continue;
 979                         iwl4965_rs_collect_tx_data(tmp_tbl, rs_index, 1,
 980                                            i < retries ? 0 : legacy_success);
 981                 }
 982
 983                 /* Update success/fail counts if not searching for new mode */
 984                 if (lq_sta->stay_in_tbl) {
 985                         lq_sta->total_success += legacy_success;
 986                         lq_sta->total_failed += retries + (1 - legacy_success);
 987                 }
 988         }
 989         /* The last TX rate is cached in lq_sta; it's set in if/else above */
 990         lq_sta->last_rate_n_flags = tx_rate;
 991 done:
 992         /* See if there's a better rate or modulation mode to try. */
 993         if (sta && sta->supp_rates[sband->band])
 994                 iwl4965_rs_rate_scale_perform(priv, skb, sta, lq_sta);
 995 }
 996
 997 /*
 998  * Begin a period of staying with a selected modulation mode.
 999  * Set "stay_in_tbl" flag to prevent any mode switches.
1000  * Set frame tx success limits according to legacy vs. high-throughput,
1001  * and reset overall (spanning all rates) tx success history statistics.
1002  * These control how long we stay using same modulation mode before
1003  * searching for a new mode.
1004  */
1005 static void iwl4965_rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
1006                                  struct iwl_lq_sta *lq_sta)
1007 {
1008         IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
1009         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
1010         if (is_legacy) {
1011                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1012                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1013                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1014         } else {
1015                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1016                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1017                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1018         }
1019         lq_sta->table_count = 0;
1020         lq_sta->total_failed = 0;
1021         lq_sta->total_success = 0;
1022         lq_sta->flush_timer = jiffies;
1023         lq_sta->action_counter = 0;
1024 }
1025
1026 /*
1027  * Find correct throughput table for given mode of modulation
1028  */
1029 static void iwl4965_rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1030                                       struct iwl_scale_tbl_info *tbl)
1031 {
1032         /* Used to choose among HT tables */
1033         s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1034
1035         /* Check for invalid LQ type */
1036         if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1037                 tbl->expected_tpt = expected_tpt_legacy;
1038                 return;
1039         }
1040
1041         /* Legacy rates have only one table */
1042         if (is_legacy(tbl->lq_type)) {
1043                 tbl->expected_tpt = expected_tpt_legacy;
1044                 return;
1045         }
1046
1047         /* Choose among many HT tables depending on number of streams
1048          * (SISO/MIMO2), channel width (20/40), SGI, and aggregation
1049          * status */
1050         if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1051                 ht_tbl_pointer = expected_tpt_siso20MHz;
1052         else if (is_siso(tbl->lq_type))
1053                 ht_tbl_pointer = expected_tpt_siso40MHz;
1054         else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1055                 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1056         else /* if (is_mimo2(tbl->lq_type)) <-- must be true */
1057                 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1058
1059         if (!tbl->is_SGI && !lq_sta->is_agg)            /* Normal */
1060                 tbl->expected_tpt = ht_tbl_pointer[0];
1061         else if (tbl->is_SGI && !lq_sta->is_agg)        /* SGI */
1062                 tbl->expected_tpt = ht_tbl_pointer[1];
1063         else if (!tbl->is_SGI && lq_sta->is_agg)        /* AGG */
1064                 tbl->expected_tpt = ht_tbl_pointer[2];
1065         else                                            /* AGG+SGI */
1066                 tbl->expected_tpt = ht_tbl_pointer[3];
1067 }
1068
1069 /*
1070  * Find starting rate for new "search" high-throughput mode of modulation.
1071  * Goal is to find lowest expected rate (under perfect conditions) that is
1072  * above the current measured throughput of "active" mode, to give new mode
1073  * a fair chance to prove itself without too many challenges.
1074  *
1075  * This gets called when transitioning to more aggressive modulation
1076  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1077  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1078  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1079  * bit rate will typically need to increase, but not if performance was bad.
1080  */
1081 static s32 iwl4965_rs_get_best_rate(struct iwl_priv *priv,
1082                             struct iwl_lq_sta *lq_sta,
1083                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1084                             u16 rate_mask, s8 index)
1085 {
1086         /* "active" values */
1087         struct iwl_scale_tbl_info *active_tbl =
1088             &(lq_sta->lq_info[lq_sta->active_tbl]);
1089         s32 active_sr = active_tbl->win[index].success_ratio;
1090         s32 active_tpt = active_tbl->expected_tpt[index];
1091
1092         /* expected "search" throughput */
1093         s32 *tpt_tbl = tbl->expected_tpt;
1094
1095         s32 new_rate, high, low, start_hi;
1096         u16 high_low;
1097         s8 rate = index;
1098
1099         new_rate = high = low = start_hi = IWL_RATE_INVALID;
1100
1101         for (; ;) {
1102                 high_low = iwl4965_rs_get_adjacent_rate(priv, rate, rate_mask,
1103                                                 tbl->lq_type);
1104
1105                 low = high_low & 0xff;
1106                 high = (high_low >> 8) & 0xff;
1107
1108                 /*
1109                  * Lower the "search" bit rate, to give new "search" mode
1110                  * approximately the same throughput as "active" if:
1111                  *
1112                  * 1) "Active" mode has been working modestly well (but not
1113                  *    great), and expected "search" throughput (under perfect
1114                  *    conditions) at candidate rate is above the actual
1115                  *    measured "active" throughput (but less than expected
1116                  *    "active" throughput under perfect conditions).
1117                  * OR
1118                  * 2) "Active" mode has been working perfectly or very well
1119                  *    and expected "search" throughput (under perfect
1120                  *    conditions) at candidate rate is above expected
1121                  *    "active" throughput (under perfect conditions).
1122                  */
1123                 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1124                      ((active_sr > IWL_RATE_DECREASE_TH) &&
1125                       (active_sr <= IWL_RATE_HIGH_TH) &&
1126                       (tpt_tbl[rate] <= active_tpt))) ||
1127                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1128                      (tpt_tbl[rate] > active_tpt))) {
1129
1130                         /* (2nd or later pass)
1131                          * If we've already tried to raise the rate, and are
1132                          * now trying to lower it, use the higher rate. */
1133                         if (start_hi != IWL_RATE_INVALID) {
1134                                 new_rate = start_hi;
1135                                 break;
1136                         }
1137
1138                         new_rate = rate;
1139
1140                         /* Loop again with lower rate */
1141                         if (low != IWL_RATE_INVALID)
1142                                 rate = low;
1143
1144                         /* Lower rate not available, use the original */
1145                         else
1146                                 break;
1147
1148                 /* Else try to raise the "search" rate to match "active" */
1149                 } else {
1150                         /* (2nd or later pass)
1151                          * If we've already tried to lower the rate, and are
1152                          * now trying to raise it, use the lower rate. */
1153                         if (new_rate != IWL_RATE_INVALID)
1154                                 break;
1155
1156                         /* Loop again with higher rate */
1157                         else if (high != IWL_RATE_INVALID) {
1158                                 start_hi = high;
1159                                 rate = high;
1160
1161                         /* Higher rate not available, use the original */
1162                         } else {
1163                                 new_rate = rate;
1164                                 break;
1165                         }
1166                 }
1167         }
1168
1169         return new_rate;
1170 }
1171
1172 /*
1173  * Set up search table for MIMO2
1174  */
1175 static int iwl4965_rs_switch_to_mimo2(struct iwl_priv *priv,
1176                              struct iwl_lq_sta *lq_sta,
1177                              struct ieee80211_conf *conf,
1178                              struct ieee80211_sta *sta,
1179                              struct iwl_scale_tbl_info *tbl, int index)
1180 {
1181         u16 rate_mask;
1182         s32 rate;
1183         s8 is_green = lq_sta->is_green;
1184         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1185         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1186
1187         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1188                 return -1;
1189
1190         if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1191                                                 == WLAN_HT_CAP_SM_PS_STATIC)
1192                 return -1;
1193
1194         /* Need both Tx chains/antennas to support MIMO */
1195         if (priv->hw_params.tx_chains_num < 2)
1196                 return -1;
1197
1198         IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1199
1200         tbl->lq_type = LQ_MIMO2;
1201         tbl->is_dup = lq_sta->is_dup;
1202         tbl->action = 0;
1203         tbl->max_search = IWL_MAX_SEARCH;
1204         rate_mask = lq_sta->active_mimo2_rate;
1205
1206         if (iwl_legacy_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1207                 tbl->is_ht40 = 1;
1208         else
1209                 tbl->is_ht40 = 0;
1210
1211         iwl4965_rs_set_expected_tpt_table(lq_sta, tbl);
1212
1213         rate = iwl4965_rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1214
1215         IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n",
1216                                 rate, rate_mask);
1217         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1218                 IWL_DEBUG_RATE(priv,
1219                                 "Can't switch with index %d rate mask %x\n",
1220                                                 rate, rate_mask);
1221                 return -1;
1222         }
1223         tbl->current_rate = iwl4965_rate_n_flags_from_tbl(priv,
1224                                                  tbl, rate, is_green);
1225
1226         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1227                      tbl->current_rate, is_green);
1228         return 0;
1229 }
1230
1231 /*
1232  * Set up search table for SISO
1233  */
1234 static int iwl4965_rs_switch_to_siso(struct iwl_priv *priv,
1235                              struct iwl_lq_sta *lq_sta,
1236                              struct ieee80211_conf *conf,
1237                              struct ieee80211_sta *sta,
1238                              struct iwl_scale_tbl_info *tbl, int index)
1239 {
1240         u16 rate_mask;
1241         u8 is_green = lq_sta->is_green;
1242         s32 rate;
1243         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1244         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1245
1246         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1247                 return -1;
1248
1249         IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1250
1251         tbl->is_dup = lq_sta->is_dup;
1252         tbl->lq_type = LQ_SISO;
1253         tbl->action = 0;
1254         tbl->max_search = IWL_MAX_SEARCH;
1255         rate_mask = lq_sta->active_siso_rate;
1256
1257         if (iwl_legacy_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1258                 tbl->is_ht40 = 1;
1259         else
1260                 tbl->is_ht40 = 0;
1261
1262         if (is_green)
1263                 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1264
1265         iwl4965_rs_set_expected_tpt_table(lq_sta, tbl);
1266         rate = iwl4965_rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1267
1268         IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1269         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1270                 IWL_DEBUG_RATE(priv,
1271                         "can not switch with index %d rate mask %x\n",
1272                              rate, rate_mask);
1273                 return -1;
1274         }
1275         tbl->current_rate = iwl4965_rate_n_flags_from_tbl(priv,
1276                                                 tbl, rate, is_green);
1277         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1278                      tbl->current_rate, is_green);
1279         return 0;
1280 }
1281
1282 /*
1283  * Try to switch to new modulation mode from legacy
1284  */
1285 static int iwl4965_rs_move_legacy_other(struct iwl_priv *priv,
1286                                 struct iwl_lq_sta *lq_sta,
1287                                 struct ieee80211_conf *conf,
1288                                 struct ieee80211_sta *sta,
1289                                 int index)
1290 {
1291         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1292         struct iwl_scale_tbl_info *search_tbl =
1293                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1294         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1295         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1296                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1297         u8 start_action;
1298         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1299         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1300         int ret = 0;
1301         u8 update_search_tbl_counter = 0;
1302
1303         tbl->action = IWL_LEGACY_SWITCH_SISO;
1304
1305         start_action = tbl->action;
1306         for (; ;) {
1307                 lq_sta->action_counter++;
1308                 switch (tbl->action) {
1309                 case IWL_LEGACY_SWITCH_ANTENNA1:
1310                 case IWL_LEGACY_SWITCH_ANTENNA2:
1311                         IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1312
1313                         if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1314                                                         tx_chains_num <= 1) ||
1315                             (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1316                                                         tx_chains_num <= 2))
1317                                 break;
1318
1319                         /* Don't change antenna if success has been great */
1320                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1321                                 break;
1322
1323                         /* Set up search table to try other antenna */
1324                         memcpy(search_tbl, tbl, sz);
1325
1326                         if (iwl4965_rs_toggle_antenna(valid_tx_ant,
1327                                 &search_tbl->current_rate, search_tbl)) {
1328                                 update_search_tbl_counter = 1;
1329                                 iwl4965_rs_set_expected_tpt_table(lq_sta,
1330                                                                 search_tbl);
1331                                 goto out;
1332                         }
1333                         break;
1334                 case IWL_LEGACY_SWITCH_SISO:
1335                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1336
1337                         /* Set up search table to try SISO */
1338                         memcpy(search_tbl, tbl, sz);
1339                         search_tbl->is_SGI = 0;
1340                         ret = iwl4965_rs_switch_to_siso(priv, lq_sta, conf, sta,
1341                                                  search_tbl, index);
1342                         if (!ret) {
1343                                 lq_sta->action_counter = 0;
1344                                 goto out;
1345                         }
1346
1347                         break;
1348                 case IWL_LEGACY_SWITCH_MIMO2_AB:
1349                 case IWL_LEGACY_SWITCH_MIMO2_AC:
1350                 case IWL_LEGACY_SWITCH_MIMO2_BC:
1351                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1352
1353                         /* Set up search table to try MIMO */
1354                         memcpy(search_tbl, tbl, sz);
1355                         search_tbl->is_SGI = 0;
1356
1357                         if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1358                                 search_tbl->ant_type = ANT_AB;
1359                         else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1360                                 search_tbl->ant_type = ANT_AC;
1361                         else
1362                                 search_tbl->ant_type = ANT_BC;
1363
1364                         if (!iwl4965_rs_is_valid_ant(valid_tx_ant,
1365                                                 search_tbl->ant_type))
1366                                 break;
1367
1368                         ret = iwl4965_rs_switch_to_mimo2(priv, lq_sta,
1369                                                 conf, sta,
1370                                                  search_tbl, index);
1371                         if (!ret) {
1372                                 lq_sta->action_counter = 0;
1373                                 goto out;
1374                         }
1375                         break;
1376                 }
1377                 tbl->action++;
1378                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2_BC)
1379                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1380
1381                 if (tbl->action == start_action)
1382                         break;
1383
1384         }
1385         search_tbl->lq_type = LQ_NONE;
1386         return 0;
1387
1388 out:
1389         lq_sta->search_better_tbl = 1;
1390         tbl->action++;
1391         if (tbl->action > IWL_LEGACY_SWITCH_MIMO2_BC)
1392                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1393         if (update_search_tbl_counter)
1394                 search_tbl->action = tbl->action;
1395         return 0;
1396
1397 }
1398
1399 /*
1400  * Try to switch to new modulation mode from SISO
1401  */
1402 static int iwl4965_rs_move_siso_to_other(struct iwl_priv *priv,
1403                                  struct iwl_lq_sta *lq_sta,
1404                                  struct ieee80211_conf *conf,
1405                                  struct ieee80211_sta *sta, int index)
1406 {
1407         u8 is_green = lq_sta->is_green;
1408         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1409         struct iwl_scale_tbl_info *search_tbl =
1410                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1411         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1412         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1413         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1414                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1415         u8 start_action;
1416         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1417         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1418         u8 update_search_tbl_counter = 0;
1419         int ret;
1420
1421         start_action = tbl->action;
1422
1423         for (;;) {
1424                 lq_sta->action_counter++;
1425                 switch (tbl->action) {
1426                 case IWL_SISO_SWITCH_ANTENNA1:
1427                 case IWL_SISO_SWITCH_ANTENNA2:
1428                         IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1429                         if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1430                                                 tx_chains_num <= 1) ||
1431                             (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1432                                                 tx_chains_num <= 2))
1433                                 break;
1434
1435                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1436                                 break;
1437
1438                         memcpy(search_tbl, tbl, sz);
1439                         if (iwl4965_rs_toggle_antenna(valid_tx_ant,
1440                                        &search_tbl->current_rate, search_tbl)) {
1441                                 update_search_tbl_counter = 1;
1442                                 goto out;
1443                         }
1444                         break;
1445                 case IWL_SISO_SWITCH_MIMO2_AB:
1446                 case IWL_SISO_SWITCH_MIMO2_AC:
1447                 case IWL_SISO_SWITCH_MIMO2_BC:
1448                         IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1449                         memcpy(search_tbl, tbl, sz);
1450                         search_tbl->is_SGI = 0;
1451
1452                         if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1453                                 search_tbl->ant_type = ANT_AB;
1454                         else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1455                                 search_tbl->ant_type = ANT_AC;
1456                         else
1457                                 search_tbl->ant_type = ANT_BC;
1458
1459                         if (!iwl4965_rs_is_valid_ant(valid_tx_ant,
1460                                                  search_tbl->ant_type))
1461                                 break;
1462
1463                         ret = iwl4965_rs_switch_to_mimo2(priv, lq_sta,
1464                                                 conf, sta,
1465                                                  search_tbl, index);
1466                         if (!ret)
1467                                 goto out;
1468                         break;
1469                 case IWL_SISO_SWITCH_GI:
1470                         if (!tbl->is_ht40 && !(ht_cap->cap &
1471                                                 IEEE80211_HT_CAP_SGI_20))
1472                                 break;
1473                         if (tbl->is_ht40 && !(ht_cap->cap &
1474                                                 IEEE80211_HT_CAP_SGI_40))
1475                                 break;
1476
1477                         IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1478
1479                         memcpy(search_tbl, tbl, sz);
1480                         if (is_green) {
1481                                 if (!tbl->is_SGI)
1482                                         break;
1483                                 else
1484                                         IWL_ERR(priv,
1485                                                 "SGI was set in GF+SISO\n");
1486                         }
1487                         search_tbl->is_SGI = !tbl->is_SGI;
1488                         iwl4965_rs_set_expected_tpt_table(lq_sta, search_tbl);
1489                         if (tbl->is_SGI) {
1490                                 s32 tpt = lq_sta->last_tpt / 100;
1491                                 if (tpt >= search_tbl->expected_tpt[index])
1492                                         break;
1493                         }
1494                         search_tbl->current_rate =
1495                                 iwl4965_rate_n_flags_from_tbl(priv, search_tbl,
1496                                                       index, is_green);
1497                         update_search_tbl_counter = 1;
1498                         goto out;
1499                 }
1500                 tbl->action++;
1501                 if (tbl->action > IWL_SISO_SWITCH_GI)
1502                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1503
1504                 if (tbl->action == start_action)
1505                         break;
1506         }
1507         search_tbl->lq_type = LQ_NONE;
1508         return 0;
1509
1510  out:
1511         lq_sta->search_better_tbl = 1;
1512         tbl->action++;
1513         if (tbl->action > IWL_SISO_SWITCH_GI)
1514                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1515         if (update_search_tbl_counter)
1516                 search_tbl->action = tbl->action;
1517
1518         return 0;
1519 }
1520
1521 /*
1522  * Try to switch to new modulation mode from MIMO2
1523  */
1524 static int iwl4965_rs_move_mimo2_to_other(struct iwl_priv *priv,
1525                                  struct iwl_lq_sta *lq_sta,
1526                                  struct ieee80211_conf *conf,
1527                                  struct ieee80211_sta *sta, int index)
1528 {
1529         s8 is_green = lq_sta->is_green;
1530         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1531         struct iwl_scale_tbl_info *search_tbl =
1532                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1533         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1534         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1535         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1536                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1537         u8 start_action;
1538         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1539         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1540         u8 update_search_tbl_counter = 0;
1541         int ret;
1542
1543         start_action = tbl->action;
1544         for (;;) {
1545                 lq_sta->action_counter++;
1546                 switch (tbl->action) {
1547                 case IWL_MIMO2_SWITCH_ANTENNA1:
1548                 case IWL_MIMO2_SWITCH_ANTENNA2:
1549                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1550
1551                         if (tx_chains_num <= 2)
1552                                 break;
1553
1554                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1555                                 break;
1556
1557                         memcpy(search_tbl, tbl, sz);
1558                         if (iwl4965_rs_toggle_antenna(valid_tx_ant,
1559                                        &search_tbl->current_rate, search_tbl)) {
1560                                 update_search_tbl_counter = 1;
1561                                 goto out;
1562                         }
1563                         break;
1564                 case IWL_MIMO2_SWITCH_SISO_A:
1565                 case IWL_MIMO2_SWITCH_SISO_B:
1566                 case IWL_MIMO2_SWITCH_SISO_C:
1567                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1568
1569                         /* Set up new search table for SISO */
1570                         memcpy(search_tbl, tbl, sz);
1571
1572                         if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1573                                 search_tbl->ant_type = ANT_A;
1574                         else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1575                                 search_tbl->ant_type = ANT_B;
1576                         else
1577                                 search_tbl->ant_type = ANT_C;
1578
1579                         if (!iwl4965_rs_is_valid_ant(valid_tx_ant,
1580                                                 search_tbl->ant_type))
1581                                 break;
1582
1583                         ret = iwl4965_rs_switch_to_siso(priv, lq_sta,
1584                                                 conf, sta,
1585                                                  search_tbl, index);
1586                         if (!ret)
1587                                 goto out;
1588
1589                         break;
1590
1591                 case IWL_MIMO2_SWITCH_GI:
1592                         if (!tbl->is_ht40 && !(ht_cap->cap &
1593                                                 IEEE80211_HT_CAP_SGI_20))
1594                                 break;
1595                         if (tbl->is_ht40 && !(ht_cap->cap &
1596                                                 IEEE80211_HT_CAP_SGI_40))
1597                                 break;
1598
1599                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1600
1601                         /* Set up new search table for MIMO2 */
1602                         memcpy(search_tbl, tbl, sz);
1603                         search_tbl->is_SGI = !tbl->is_SGI;
1604                         iwl4965_rs_set_expected_tpt_table(lq_sta, search_tbl);
1605                         /*
1606                          * If active table already uses the fastest possible
1607                          * modulation (dual stream with short guard interval),
1608                          * and it's working well, there's no need to look
1609                          * for a better type of modulation!
1610                          */
1611                         if (tbl->is_SGI) {
1612                                 s32 tpt = lq_sta->last_tpt / 100;
1613                                 if (tpt >= search_tbl->expected_tpt[index])
1614                                         break;
1615                         }
1616                         search_tbl->current_rate =
1617                                 iwl4965_rate_n_flags_from_tbl(priv, search_tbl,
1618                                                       index, is_green);
1619                         update_search_tbl_counter = 1;
1620                         goto out;
1621
1622                 }
1623                 tbl->action++;
1624                 if (tbl->action > IWL_MIMO2_SWITCH_GI)
1625                         tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1626
1627                 if (tbl->action == start_action)
1628                         break;
1629         }
1630         search_tbl->lq_type = LQ_NONE;
1631         return 0;
1632  out:
1633         lq_sta->search_better_tbl = 1;
1634         tbl->action++;
1635         if (tbl->action > IWL_MIMO2_SWITCH_GI)
1636                 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1637         if (update_search_tbl_counter)
1638                 search_tbl->action = tbl->action;
1639
1640         return 0;
1641
1642 }
1643
1644 /*
1645  * Check whether we should continue using same modulation mode, or
1646  * begin search for a new mode, based on:
1647  * 1) # tx successes or failures while using this mode
1648  * 2) # times calling this function
1649  * 3) elapsed time in this mode (not used, for now)
1650  */
1651 static void
1652 iwl4965_rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1653 {
1654         struct iwl_scale_tbl_info *tbl;
1655         int i;
1656         int active_tbl;
1657         int flush_interval_passed = 0;
1658         struct iwl_priv *priv;
1659
1660         priv = lq_sta->drv;
1661         active_tbl = lq_sta->active_tbl;
1662
1663         tbl = &(lq_sta->lq_info[active_tbl]);
1664
1665         /* If we've been disallowing search, see if we should now allow it */
1666         if (lq_sta->stay_in_tbl) {
1667
1668                 /* Elapsed time using current modulation mode */
1669                 if (lq_sta->flush_timer)
1670                         flush_interval_passed =
1671                         time_after(jiffies,
1672                                         (unsigned long)(lq_sta->flush_timer +
1673                                         IWL_RATE_SCALE_FLUSH_INTVL));
1674
1675                 /*
1676                  * Check if we should allow search for new modulation mode.
1677                  * If many frames have failed or succeeded, or we've used
1678                  * this same modulation for a long time, allow search, and
1679                  * reset history stats that keep track of whether we should
1680                  * allow a new search.  Also (below) reset all bitmaps and
1681                  * stats in active history.
1682                  */
1683                 if (force_search ||
1684                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1685                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1686                     ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1687                      && (flush_interval_passed))) {
1688                         IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n:",
1689                                      lq_sta->total_failed,
1690                                      lq_sta->total_success,
1691                                      flush_interval_passed);
1692
1693                         /* Allow search for new mode */
1694                         lq_sta->stay_in_tbl = 0;        /* only place reset */
1695                         lq_sta->total_failed = 0;
1696                         lq_sta->total_success = 0;
1697                         lq_sta->flush_timer = 0;
1698
1699                 /*
1700                  * Else if we've used this modulation mode enough repetitions
1701                  * (regardless of elapsed time or success/failure), reset
1702                  * history bitmaps and rate-specific stats for all rates in
1703                  * active table.
1704                  */
1705                 } else {
1706                         lq_sta->table_count++;
1707                         if (lq_sta->table_count >=
1708                             lq_sta->table_count_limit) {
1709                                 lq_sta->table_count = 0;
1710
1711                                 IWL_DEBUG_RATE(priv,
1712                                         "LQ: stay in table clear win\n");
1713                                 for (i = 0; i < IWL_RATE_COUNT; i++)
1714                                         iwl4965_rs_rate_scale_clear_window(
1715                                                 &(tbl->win[i]));
1716                         }
1717                 }
1718
1719                 /* If transitioning to allow "search", reset all history
1720                  * bitmaps and stats in active table (this will become the new
1721                  * "search" table). */
1722                 if (!lq_sta->stay_in_tbl) {
1723                         for (i = 0; i < IWL_RATE_COUNT; i++)
1724                                 iwl4965_rs_rate_scale_clear_window(
1725                                                         &(tbl->win[i]));
1726                 }
1727         }
1728 }
1729
1730 /*
1731  * setup rate table in uCode
1732  * return rate_n_flags as used in the table
1733  */
1734 static u32 iwl4965_rs_update_rate_tbl(struct iwl_priv *priv,
1735                               struct iwl_rxon_context *ctx,
1736                                 struct iwl_lq_sta *lq_sta,
1737                                 struct iwl_scale_tbl_info *tbl,
1738                                 int index, u8 is_green)
1739 {
1740         u32 rate;
1741
1742         /* Update uCode's rate table. */
1743         rate = iwl4965_rate_n_flags_from_tbl(priv, tbl, index, is_green);
1744         iwl4965_rs_fill_link_cmd(priv, lq_sta, rate);
1745         iwl_legacy_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
1746
1747         return rate;
1748 }
1749
1750 /*
1751  * Do rate scaling and search for new modulation mode.
1752  */
1753 static void iwl4965_rs_rate_scale_perform(struct iwl_priv *priv,
1754                                   struct sk_buff *skb,
1755                                   struct ieee80211_sta *sta,
1756                                   struct iwl_lq_sta *lq_sta)
1757 {
1758         struct ieee80211_hw *hw = priv->hw;
1759         struct ieee80211_conf *conf = &hw->conf;
1760         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1761         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1762         int low = IWL_RATE_INVALID;
1763         int high = IWL_RATE_INVALID;
1764         int index;
1765         int i;
1766         struct iwl_rate_scale_data *window = NULL;
1767         int current_tpt = IWL_INVALID_VALUE;
1768         int low_tpt = IWL_INVALID_VALUE;
1769         int high_tpt = IWL_INVALID_VALUE;
1770         u32 fail_count;
1771         s8 scale_action = 0;
1772         u16 rate_mask;
1773         u8 update_lq = 0;
1774         struct iwl_scale_tbl_info *tbl, *tbl1;
1775         u16 rate_scale_index_msk = 0;
1776         u32 rate;
1777         u8 is_green = 0;
1778         u8 active_tbl = 0;
1779         u8 done_search = 0;
1780         u16 high_low;
1781         s32 sr;
1782         u8 tid = MAX_TID_COUNT;
1783         struct iwl_tid_data *tid_data;
1784         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1785         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1786
1787         IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
1788
1789         /* Send management frames and NO_ACK data using lowest rate. */
1790         /* TODO: this could probably be improved.. */
1791         if (!ieee80211_is_data(hdr->frame_control) ||
1792             info->flags & IEEE80211_TX_CTL_NO_ACK)
1793                 return;
1794
1795         if (!sta || !lq_sta)
1796                 return;
1797
1798         lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
1799
1800         tid = iwl4965_rs_tl_add_packet(lq_sta, hdr);
1801         if ((tid != MAX_TID_COUNT) && (lq_sta->tx_agg_tid_en & (1 << tid))) {
1802                 tid_data = &priv->stations[lq_sta->lq.sta_id].tid[tid];
1803                 if (tid_data->agg.state == IWL_AGG_OFF)
1804                         lq_sta->is_agg = 0;
1805                 else
1806                         lq_sta->is_agg = 1;
1807         } else
1808                 lq_sta->is_agg = 0;
1809
1810         /*
1811          * Select rate-scale / modulation-mode table to work with in
1812          * the rest of this function:  "search" if searching for better
1813          * modulation mode, or "active" if doing rate scaling within a mode.
1814          */
1815         if (!lq_sta->search_better_tbl)
1816                 active_tbl = lq_sta->active_tbl;
1817         else
1818                 active_tbl = 1 - lq_sta->active_tbl;
1819
1820         tbl = &(lq_sta->lq_info[active_tbl]);
1821         if (is_legacy(tbl->lq_type))
1822                 lq_sta->is_green = 0;
1823         else
1824                 lq_sta->is_green = iwl4965_rs_use_green(sta);
1825         is_green = lq_sta->is_green;
1826
1827         /* current tx rate */
1828         index = lq_sta->last_txrate_idx;
1829
1830         IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
1831                        tbl->lq_type);
1832
1833         /* rates available for this association, and for modulation mode */
1834         rate_mask = iwl4965_rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
1835
1836         IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
1837
1838         /* mask with station rate restriction */
1839         if (is_legacy(tbl->lq_type)) {
1840                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1841                         /* supp_rates has no CCK bits in A mode */
1842                         rate_scale_index_msk = (u16) (rate_mask &
1843                                 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1844                 else
1845                         rate_scale_index_msk = (u16) (rate_mask &
1846                                                       lq_sta->supp_rates);
1847
1848         } else
1849                 rate_scale_index_msk = rate_mask;
1850
1851         if (!rate_scale_index_msk)
1852                 rate_scale_index_msk = rate_mask;
1853
1854         if (!((1 << index) & rate_scale_index_msk)) {
1855                 IWL_ERR(priv, "Current Rate is not valid\n");
1856                 if (lq_sta->search_better_tbl) {
1857                         /* revert to active table if search table is not valid*/
1858                         tbl->lq_type = LQ_NONE;
1859                         lq_sta->search_better_tbl = 0;
1860                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1861                         /* get "active" rate info */
1862                         index = iwl4965_hwrate_to_plcp_idx(tbl->current_rate);
1863                         rate = iwl4965_rs_update_rate_tbl(priv, ctx, lq_sta,
1864                                                   tbl, index, is_green);
1865                 }
1866                 return;
1867         }
1868
1869         /* Get expected throughput table and history window for current rate */
1870         if (!tbl->expected_tpt) {
1871                 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
1872                 return;
1873         }
1874
1875         /* force user max rate if set by user */
1876         if ((lq_sta->max_rate_idx != -1) &&
1877             (lq_sta->max_rate_idx < index)) {
1878                 index = lq_sta->max_rate_idx;
1879                 update_lq = 1;
1880                 window = &(tbl->win[index]);
1881                 goto lq_update;
1882         }
1883
1884         window = &(tbl->win[index]);
1885
1886         /*
1887          * If there is not enough history to calculate actual average
1888          * throughput, keep analyzing results of more tx frames, without
1889          * changing rate or mode (bypass most of the rest of this function).
1890          * Set up new rate table in uCode only if old rate is not supported
1891          * in current association (use new rate found above).
1892          */
1893         fail_count = window->counter - window->success_counter;
1894         if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1895                         (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
1896                 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
1897                                "for index %d\n",
1898                                window->success_counter, window->counter, index);
1899
1900                 /* Can't calculate this yet; not enough history */
1901                 window->average_tpt = IWL_INVALID_VALUE;
1902
1903                 /* Should we stay with this modulation mode,
1904                  * or search for a new one? */
1905                 iwl4965_rs_stay_in_table(lq_sta, false);
1906
1907                 goto out;
1908         }
1909         /* Else we have enough samples; calculate estimate of
1910          * actual average throughput */
1911         if (window->average_tpt != ((window->success_ratio *
1912                         tbl->expected_tpt[index] + 64) / 128)) {
1913                 IWL_ERR(priv,
1914                          "expected_tpt should have been calculated by now\n");
1915                 window->average_tpt = ((window->success_ratio *
1916                                         tbl->expected_tpt[index] + 64) / 128);
1917         }
1918
1919         /* If we are searching for better modulation mode, check success. */
1920         if (lq_sta->search_better_tbl) {
1921                 /* If good success, continue using the "search" mode;
1922                  * no need to send new link quality command, since we're
1923                  * continuing to use the setup that we've been trying. */
1924                 if (window->average_tpt > lq_sta->last_tpt) {
1925
1926                         IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
1927                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
1928                                         window->success_ratio,
1929                                         window->average_tpt,
1930                                         lq_sta->last_tpt);
1931
1932                         if (!is_legacy(tbl->lq_type))
1933                                 lq_sta->enable_counter = 1;
1934
1935                         /* Swap tables; "search" becomes "active" */
1936                         lq_sta->active_tbl = active_tbl;
1937                         current_tpt = window->average_tpt;
1938
1939                 /* Else poor success; go back to mode in "active" table */
1940                 } else {
1941
1942                         IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
1943                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
1944                                         window->success_ratio,
1945                                         window->average_tpt,
1946                                         lq_sta->last_tpt);
1947
1948                         /* Nullify "search" table */
1949                         tbl->lq_type = LQ_NONE;
1950
1951                         /* Revert to "active" table */
1952                         active_tbl = lq_sta->active_tbl;
1953                         tbl = &(lq_sta->lq_info[active_tbl]);
1954
1955                         /* Revert to "active" rate and throughput info */
1956                         index = iwl4965_hwrate_to_plcp_idx(tbl->current_rate);
1957                         current_tpt = lq_sta->last_tpt;
1958
1959                         /* Need to set up a new rate table in uCode */
1960                         update_lq = 1;
1961                 }
1962
1963                 /* Either way, we've made a decision; modulation mode
1964                  * search is done, allow rate adjustment next time. */
1965                 lq_sta->search_better_tbl = 0;
1966                 done_search = 1;        /* Don't switch modes below! */
1967                 goto lq_update;
1968         }
1969
1970         /* (Else) not in search of better modulation mode, try for better
1971          * starting rate, while staying in this mode. */
1972         high_low = iwl4965_rs_get_adjacent_rate(priv, index,
1973                                         rate_scale_index_msk,
1974                                         tbl->lq_type);
1975         low = high_low & 0xff;
1976         high = (high_low >> 8) & 0xff;
1977
1978         /* If user set max rate, dont allow higher than user constrain */
1979         if ((lq_sta->max_rate_idx != -1) &&
1980             (lq_sta->max_rate_idx < high))
1981                 high = IWL_RATE_INVALID;
1982
1983         sr = window->success_ratio;
1984
1985         /* Collect measured throughputs for current and adjacent rates */
1986         current_tpt = window->average_tpt;
1987         if (low != IWL_RATE_INVALID)
1988                 low_tpt = tbl->win[low].average_tpt;
1989         if (high != IWL_RATE_INVALID)
1990                 high_tpt = tbl->win[high].average_tpt;
1991
1992         scale_action = 0;
1993
1994         /* Too many failures, decrease rate */
1995         if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
1996                 IWL_DEBUG_RATE(priv,
1997                         "decrease rate because of low success_ratio\n");
1998                 scale_action = -1;
1999
2000         /* No throughput measured yet for adjacent rates; try increase. */
2001         } else if ((low_tpt == IWL_INVALID_VALUE) &&
2002                    (high_tpt == IWL_INVALID_VALUE)) {
2003
2004                 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2005                         scale_action = 1;
2006                 else if (low != IWL_RATE_INVALID)
2007                         scale_action = 0;
2008         }
2009
2010         /* Both adjacent throughputs are measured, but neither one has better
2011          * throughput; we're using the best rate, don't change it! */
2012         else if ((low_tpt != IWL_INVALID_VALUE) &&
2013                  (high_tpt != IWL_INVALID_VALUE) &&
2014                  (low_tpt < current_tpt) &&
2015                  (high_tpt < current_tpt))
2016                 scale_action = 0;
2017
2018         /* At least one adjacent rate's throughput is measured,
2019          * and may have better performance. */
2020         else {
2021                 /* Higher adjacent rate's throughput is measured */
2022                 if (high_tpt != IWL_INVALID_VALUE) {
2023                         /* Higher rate has better throughput */
2024                         if (high_tpt > current_tpt &&
2025                                         sr >= IWL_RATE_INCREASE_TH) {
2026                                 scale_action = 1;
2027                         } else {
2028                                 scale_action = 0;
2029                         }
2030
2031                 /* Lower adjacent rate's throughput is measured */
2032                 } else if (low_tpt != IWL_INVALID_VALUE) {
2033                         /* Lower rate has better throughput */
2034                         if (low_tpt > current_tpt) {
2035                                 IWL_DEBUG_RATE(priv,
2036                                     "decrease rate because of low tpt\n");
2037                                 scale_action = -1;
2038                         } else if (sr >= IWL_RATE_INCREASE_TH) {
2039                                 scale_action = 1;
2040                         }
2041                 }
2042         }
2043
2044         /* Sanity check; asked for decrease, but success rate or throughput
2045          * has been good at old rate.  Don't change it. */
2046         if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2047                     ((sr > IWL_RATE_HIGH_TH) ||
2048                      (current_tpt > (100 * tbl->expected_tpt[low]))))
2049                 scale_action = 0;
2050
2051         switch (scale_action) {
2052         case -1:
2053                 /* Decrease starting rate, update uCode's rate table */
2054                 if (low != IWL_RATE_INVALID) {
2055                         update_lq = 1;
2056                         index = low;
2057                 }
2058
2059                 break;
2060         case 1:
2061                 /* Increase starting rate, update uCode's rate table */
2062                 if (high != IWL_RATE_INVALID) {
2063                         update_lq = 1;
2064                         index = high;
2065                 }
2066
2067                 break;
2068         case 0:
2069                 /* No change */
2070         default:
2071                 break;
2072         }
2073
2074         IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2075                     "high %d type %d\n",
2076                      index, scale_action, low, high, tbl->lq_type);
2077
2078 lq_update:
2079         /* Replace uCode's rate table for the destination station. */
2080         if (update_lq)
2081                 rate = iwl4965_rs_update_rate_tbl(priv, ctx, lq_sta,
2082                                           tbl, index, is_green);
2083
2084         /* Should we stay with this modulation mode,
2085          * or search for a new one? */
2086          iwl4965_rs_stay_in_table(lq_sta, false);
2087
2088         /*
2089          * Search for new modulation mode if we're:
2090          * 1)  Not changing rates right now
2091          * 2)  Not just finishing up a search
2092          * 3)  Allowing a new search
2093          */
2094         if (!update_lq && !done_search &&
2095                 !lq_sta->stay_in_tbl && window->counter) {
2096                 /* Save current throughput to compare with "search" throughput*/
2097                 lq_sta->last_tpt = current_tpt;
2098
2099                 /* Select a new "search" modulation mode to try.
2100                  * If one is found, set up the new "search" table. */
2101                 if (is_legacy(tbl->lq_type))
2102                         iwl4965_rs_move_legacy_other(priv, lq_sta,
2103                                                         conf, sta, index);
2104                 else if (is_siso(tbl->lq_type))
2105                         iwl4965_rs_move_siso_to_other(priv, lq_sta,
2106                                                         conf, sta, index);
2107                 else /* (is_mimo2(tbl->lq_type)) */
2108                         iwl4965_rs_move_mimo2_to_other(priv, lq_sta,
2109                                                         conf, sta, index);
2110
2111                 /* If new "search" mode was selected, set up in uCode table */
2112                 if (lq_sta->search_better_tbl) {
2113                         /* Access the "search" table, clear its history. */
2114                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2115                         for (i = 0; i < IWL_RATE_COUNT; i++)
2116                                 iwl4965_rs_rate_scale_clear_window(
2117                                                         &(tbl->win[i]));
2118
2119                         /* Use new "search" start rate */
2120                         index = iwl4965_hwrate_to_plcp_idx(tbl->current_rate);
2121
2122                         IWL_DEBUG_RATE(priv,
2123                                 "Switch current  mcs: %X index: %d\n",
2124                                      tbl->current_rate, index);
2125                         iwl4965_rs_fill_link_cmd(priv, lq_sta,
2126                                                 tbl->current_rate);
2127                         iwl_legacy_send_lq_cmd(priv, ctx,
2128                                                 &lq_sta->lq, CMD_ASYNC, false);
2129                 } else
2130                         done_search = 1;
2131         }
2132
2133         if (done_search && !lq_sta->stay_in_tbl) {
2134                 /* If the "active" (non-search) mode was legacy,
2135                  * and we've tried switching antennas,
2136                  * but we haven't been able to try HT modes (not available),
2137                  * stay with best antenna legacy modulation for a while
2138                  * before next round of mode comparisons. */
2139                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2140                 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2141                     lq_sta->action_counter > tbl1->max_search) {
2142                         IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2143                         iwl4965_rs_set_stay_in_table(priv, 1, lq_sta);
2144                 }
2145
2146                 /* If we're in an HT mode, and all 3 mode switch actions
2147                  * have been tried and compared, stay in this best modulation
2148                  * mode for a while before next round of mode comparisons. */
2149                 if (lq_sta->enable_counter &&
2150                     (lq_sta->action_counter >= tbl1->max_search)) {
2151                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2152                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2153                             (tid != MAX_TID_COUNT)) {
2154                                 tid_data =
2155                                    &priv->stations[lq_sta->lq.sta_id].tid[tid];
2156                                 if (tid_data->agg.state == IWL_AGG_OFF) {
2157                                         IWL_DEBUG_RATE(priv,
2158                                                        "try to aggregate tid %d\n",
2159                                                        tid);
2160                                         iwl4965_rs_tl_turn_on_agg(priv, tid,
2161                                                           lq_sta, sta);
2162                                 }
2163                         }
2164                         iwl4965_rs_set_stay_in_table(priv, 0, lq_sta);
2165                 }
2166         }
2167
2168 out:
2169         tbl->current_rate = iwl4965_rate_n_flags_from_tbl(priv, tbl,
2170                                                         index, is_green);
2171         i = index;
2172         lq_sta->last_txrate_idx = i;
2173 }
2174
2175 /**
2176  * iwl4965_rs_initialize_lq - Initialize a station's hardware rate table
2177  *
2178  * The uCode's station table contains a table of fallback rates
2179  * for automatic fallback during transmission.
2180  *
2181  * NOTE: This sets up a default set of values.  These will be replaced later
2182  *       if the driver's iwl-4965-rs rate scaling algorithm is used, instead of
2183  *       rc80211_simple.
2184  *
2185  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2186  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2187  *       which requires station table entry to exist).
2188  */
2189 static void iwl4965_rs_initialize_lq(struct iwl_priv *priv,
2190                              struct ieee80211_conf *conf,
2191                              struct ieee80211_sta *sta,
2192                              struct iwl_lq_sta *lq_sta)
2193 {
2194         struct iwl_scale_tbl_info *tbl;
2195         int rate_idx;
2196         int i;
2197         u32 rate;
2198         u8 use_green = iwl4965_rs_use_green(sta);
2199         u8 active_tbl = 0;
2200         u8 valid_tx_ant;
2201         struct iwl_station_priv *sta_priv;
2202         struct iwl_rxon_context *ctx;
2203
2204         if (!sta || !lq_sta)
2205                 return;
2206
2207         sta_priv = (void *)sta->drv_priv;
2208         ctx = sta_priv->common.ctx;
2209
2210         i = lq_sta->last_txrate_idx;
2211
2212         valid_tx_ant = priv->hw_params.valid_tx_ant;
2213
2214         if (!lq_sta->search_better_tbl)
2215                 active_tbl = lq_sta->active_tbl;
2216         else
2217                 active_tbl = 1 - lq_sta->active_tbl;
2218
2219         tbl = &(lq_sta->lq_info[active_tbl]);
2220
2221         if ((i < 0) || (i >= IWL_RATE_COUNT))
2222                 i = 0;
2223
2224         rate = iwlegacy_rates[i].plcp;
2225         tbl->ant_type = iwl4965_first_antenna(valid_tx_ant);
2226         rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2227
2228         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2229                 rate |= RATE_MCS_CCK_MSK;
2230
2231         iwl4965_rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2232         if (!iwl4965_rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2233                 iwl4965_rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2234
2235         rate = iwl4965_rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2236         tbl->current_rate = rate;
2237         iwl4965_rs_set_expected_tpt_table(lq_sta, tbl);
2238         iwl4965_rs_fill_link_cmd(NULL, lq_sta, rate);
2239         priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2240         iwl_legacy_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_SYNC, true);
2241 }
2242
2243 static void
2244 iwl4965_rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2245                         struct ieee80211_tx_rate_control *txrc)
2246 {
2247
2248         struct sk_buff *skb = txrc->skb;
2249         struct ieee80211_supported_band *sband = txrc->sband;
2250         struct iwl_priv *priv __maybe_unused = (struct iwl_priv *)priv_r;
2251         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2252         struct iwl_lq_sta *lq_sta = priv_sta;
2253         int rate_idx;
2254
2255         IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2256
2257         /* Get max rate if user set max rate */
2258         if (lq_sta) {
2259                 lq_sta->max_rate_idx = txrc->max_rate_idx;
2260                 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2261                     (lq_sta->max_rate_idx != -1))
2262                         lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2263                 if ((lq_sta->max_rate_idx < 0) ||
2264                     (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2265                         lq_sta->max_rate_idx = -1;
2266         }
2267
2268         /* Treat uninitialized rate scaling data same as non-existing. */
2269         if (lq_sta && !lq_sta->drv) {
2270                 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
2271                 priv_sta = NULL;
2272         }
2273
2274         /* Send management frames and NO_ACK data using lowest rate. */
2275         if (rate_control_send_low(sta, priv_sta, txrc))
2276                 return;
2277
2278         rate_idx  = lq_sta->last_txrate_idx;
2279
2280         if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2281                 rate_idx -= IWL_FIRST_OFDM_RATE;
2282                 /* 6M and 9M shared same MCS index */
2283                 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2284                 if (iwl4965_rs_extract_rate(lq_sta->last_rate_n_flags) >=
2285                          IWL_RATE_MIMO2_6M_PLCP)
2286                         rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2287                 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2288                 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2289                         info->control.rates[0].flags |=
2290                                         IEEE80211_TX_RC_SHORT_GI;
2291                 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2292                         info->control.rates[0].flags |=
2293                                         IEEE80211_TX_RC_DUP_DATA;
2294                 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2295                         info->control.rates[0].flags |=
2296                                         IEEE80211_TX_RC_40_MHZ_WIDTH;
2297                 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2298                         info->control.rates[0].flags |=
2299                                         IEEE80211_TX_RC_GREEN_FIELD;
2300         } else {
2301                 /* Check for invalid rates */
2302                 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2303                                 ((sband->band == IEEE80211_BAND_5GHZ) &&
2304                                  (rate_idx < IWL_FIRST_OFDM_RATE)))
2305                         rate_idx = rate_lowest_index(sband, sta);
2306                 /* On valid 5 GHz rate, adjust index */
2307                 else if (sband->band == IEEE80211_BAND_5GHZ)
2308                         rate_idx -= IWL_FIRST_OFDM_RATE;
2309                 info->control.rates[0].flags = 0;
2310         }
2311         info->control.rates[0].idx = rate_idx;
2312
2313 }
2314
2315 static void *iwl4965_rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2316                           gfp_t gfp)
2317 {
2318         struct iwl_lq_sta *lq_sta;
2319         struct iwl_station_priv *sta_priv =
2320                                 (struct iwl_station_priv *) sta->drv_priv;
2321         struct iwl_priv *priv;
2322
2323         priv = (struct iwl_priv *)priv_rate;
2324         IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2325
2326         lq_sta = &sta_priv->lq_sta;
2327
2328         return lq_sta;
2329 }
2330
2331 /*
2332  * Called after adding a new station to initialize rate scaling
2333  */
2334 void
2335 iwl4965_rs_rate_init(struct iwl_priv *priv,
2336                         struct ieee80211_sta *sta,
2337                         u8 sta_id)
2338 {
2339         int i, j;
2340         struct ieee80211_hw *hw = priv->hw;
2341         struct ieee80211_conf *conf = &priv->hw->conf;
2342         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2343         struct iwl_station_priv *sta_priv;
2344         struct iwl_lq_sta *lq_sta;
2345         struct ieee80211_supported_band *sband;
2346
2347         sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2348         lq_sta = &sta_priv->lq_sta;
2349         sband = hw->wiphy->bands[conf->channel->band];
2350
2351
2352         lq_sta->lq.sta_id = sta_id;
2353
2354         for (j = 0; j < LQ_SIZE; j++)
2355                 for (i = 0; i < IWL_RATE_COUNT; i++)
2356                         iwl4965_rs_rate_scale_clear_window(
2357                                         &lq_sta->lq_info[j].win[i]);
2358
2359         lq_sta->flush_timer = 0;
2360         lq_sta->supp_rates = sta->supp_rates[sband->band];
2361         for (j = 0; j < LQ_SIZE; j++)
2362                 for (i = 0; i < IWL_RATE_COUNT; i++)
2363                         iwl4965_rs_rate_scale_clear_window(
2364                                         &lq_sta->lq_info[j].win[i]);
2365
2366         IWL_DEBUG_RATE(priv, "LQ:"
2367                         "*** rate scale station global init for station %d ***\n",
2368                        sta_id);
2369         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2370          * the lowest or the highest rate.. Could consider using RSSI from
2371          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2372          * after assoc.. */
2373
2374         lq_sta->is_dup = 0;
2375         lq_sta->max_rate_idx = -1;
2376         lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2377         lq_sta->is_green = iwl4965_rs_use_green(sta);
2378         lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2379         lq_sta->band = priv->band;
2380         /*
2381          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2382          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2383          */
2384         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2385         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2386         lq_sta->active_siso_rate &= ~((u16)0x2);
2387         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2388
2389         /* Same here */
2390         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2391         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2392         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2393         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2394
2395         /* These values will be overridden later */
2396         lq_sta->lq.general_params.single_stream_ant_msk =
2397                 iwl4965_first_antenna(priv->hw_params.valid_tx_ant);
2398         lq_sta->lq.general_params.dual_stream_ant_msk =
2399                 priv->hw_params.valid_tx_ant &
2400                 ~iwl4965_first_antenna(priv->hw_params.valid_tx_ant);
2401         if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2402                 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2403         } else if (iwl4965_num_of_ant(priv->hw_params.valid_tx_ant) == 2) {
2404                 lq_sta->lq.general_params.dual_stream_ant_msk =
2405                         priv->hw_params.valid_tx_ant;
2406         }
2407
2408         /* as default allow aggregation for all tids */
2409         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2410         lq_sta->drv = priv;
2411
2412         /* Set last_txrate_idx to lowest rate */
2413         lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2414         if (sband->band == IEEE80211_BAND_5GHZ)
2415                 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2416         lq_sta->is_agg = 0;
2417
2418 #ifdef CONFIG_MAC80211_DEBUGFS
2419         lq_sta->dbg_fixed_rate = 0;
2420 #endif
2421
2422         iwl4965_rs_initialize_lq(priv, conf, sta, lq_sta);
2423 }
2424
2425 static void iwl4965_rs_fill_link_cmd(struct iwl_priv *priv,
2426                              struct iwl_lq_sta *lq_sta, u32 new_rate)
2427 {
2428         struct iwl_scale_tbl_info tbl_type;
2429         int index = 0;
2430         int rate_idx;
2431         int repeat_rate = 0;
2432         u8 ant_toggle_cnt = 0;
2433         u8 use_ht_possible = 1;
2434         u8 valid_tx_ant = 0;
2435         struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2436
2437         /* Override starting rate (index 0) if needed for debug purposes */
2438         iwl4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2439
2440         /* Interpret new_rate (rate_n_flags) */
2441         iwl4965_rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2442                                   &tbl_type, &rate_idx);
2443
2444         /* How many times should we repeat the initial rate? */
2445         if (is_legacy(tbl_type.lq_type)) {
2446                 ant_toggle_cnt = 1;
2447                 repeat_rate = IWL_NUMBER_TRY;
2448         } else {
2449                 repeat_rate = IWL_HT_NUMBER_TRY;
2450         }
2451
2452         lq_cmd->general_params.mimo_delimiter =
2453                         is_mimo(tbl_type.lq_type) ? 1 : 0;
2454
2455         /* Fill 1st table entry (index 0) */
2456         lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2457
2458         if (iwl4965_num_of_ant(tbl_type.ant_type) == 1) {
2459                 lq_cmd->general_params.single_stream_ant_msk =
2460                                                 tbl_type.ant_type;
2461         } else if (iwl4965_num_of_ant(tbl_type.ant_type) == 2) {
2462                 lq_cmd->general_params.dual_stream_ant_msk =
2463                                                 tbl_type.ant_type;
2464         } /* otherwise we don't modify the existing value */
2465
2466         index++;
2467         repeat_rate--;
2468         if (priv)
2469                 valid_tx_ant = priv->hw_params.valid_tx_ant;
2470
2471         /* Fill rest of rate table */
2472         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2473                 /* Repeat initial/next rate.
2474                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2475                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2476                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2477                         if (is_legacy(tbl_type.lq_type)) {
2478                                 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2479                                         ant_toggle_cnt++;
2480                                 else if (priv &&
2481                                          iwl4965_rs_toggle_antenna(valid_tx_ant,
2482                                                         &new_rate, &tbl_type))
2483                                         ant_toggle_cnt = 1;
2484                         }
2485
2486                         /* Override next rate if needed for debug purposes */
2487                         iwl4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2488
2489                         /* Fill next table entry */
2490                         lq_cmd->rs_table[index].rate_n_flags =
2491                                         cpu_to_le32(new_rate);
2492                         repeat_rate--;
2493                         index++;
2494                 }
2495
2496                 iwl4965_rs_get_tbl_info_from_mcs(new_rate,
2497                                                 lq_sta->band, &tbl_type,
2498                                                 &rate_idx);
2499
2500                 /* Indicate to uCode which entries might be MIMO.
2501                  * If initial rate was MIMO, this will finally end up
2502                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2503                 if (is_mimo(tbl_type.lq_type))
2504                         lq_cmd->general_params.mimo_delimiter = index;
2505
2506                 /* Get next rate */
2507                 new_rate = iwl4965_rs_get_lower_rate(lq_sta,
2508                                         &tbl_type, rate_idx,
2509                                              use_ht_possible);
2510
2511                 /* How many times should we repeat the next rate? */
2512                 if (is_legacy(tbl_type.lq_type)) {
2513                         if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2514                                 ant_toggle_cnt++;
2515                         else if (priv &&
2516                                  iwl4965_rs_toggle_antenna(valid_tx_ant,
2517                                                    &new_rate, &tbl_type))
2518                                 ant_toggle_cnt = 1;
2519
2520                         repeat_rate = IWL_NUMBER_TRY;
2521                 } else {
2522                         repeat_rate = IWL_HT_NUMBER_TRY;
2523                 }
2524
2525                 /* Don't allow HT rates after next pass.
2526                  * iwl4965_rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2527                 use_ht_possible = 0;
2528
2529                 /* Override next rate if needed for debug purposes */
2530                 iwl4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2531
2532                 /* Fill next table entry */
2533                 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2534
2535                 index++;
2536                 repeat_rate--;
2537         }
2538
2539         lq_cmd->agg_params.agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2540         lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2541
2542         lq_cmd->agg_params.agg_time_limit =
2543                 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2544 }
2545
2546 static void
2547 *iwl4965_rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2548 {
2549         return hw->priv;
2550 }
2551 /* rate scale requires free function to be implemented */
2552 static void iwl4965_rs_free(void *priv_rate)
2553 {
2554         return;
2555 }
2556
2557 static void iwl4965_rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
2558                         void *priv_sta)
2559 {
2560         struct iwl_priv *priv __maybe_unused = priv_r;
2561
2562         IWL_DEBUG_RATE(priv, "enter\n");
2563         IWL_DEBUG_RATE(priv, "leave\n");
2564 }
2565
2566
2567 #ifdef CONFIG_MAC80211_DEBUGFS
2568 static int iwl4965_open_file_generic(struct inode *inode, struct file *file)
2569 {
2570         file->private_data = inode->i_private;
2571         return 0;
2572 }
2573 static void iwl4965_rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2574                              u32 *rate_n_flags, int index)
2575 {
2576         struct iwl_priv *priv;
2577         u8 valid_tx_ant;
2578         u8 ant_sel_tx;
2579
2580         priv = lq_sta->drv;
2581         valid_tx_ant = priv->hw_params.valid_tx_ant;
2582         if (lq_sta->dbg_fixed_rate) {
2583                 ant_sel_tx =
2584                   ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
2585                   >> RATE_MCS_ANT_POS);
2586                 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
2587                         *rate_n_flags = lq_sta->dbg_fixed_rate;
2588                         IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
2589                 } else {
2590                         lq_sta->dbg_fixed_rate = 0;
2591                         IWL_ERR(priv,
2592                             "Invalid antenna selection 0x%X, Valid is 0x%X\n",
2593                             ant_sel_tx, valid_tx_ant);
2594                         IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
2595                 }
2596         } else {
2597                 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
2598         }
2599 }
2600
2601 static ssize_t iwl4965_rs_sta_dbgfs_scale_table_write(struct file *file,
2602                         const char __user *user_buf, size_t count, loff_t *ppos)
2603 {
2604         struct iwl_lq_sta *lq_sta = file->private_data;
2605         struct iwl_priv *priv;
2606         char buf[64];
2607         size_t buf_size;
2608         u32 parsed_rate;
2609         struct iwl_station_priv *sta_priv =
2610                 container_of(lq_sta, struct iwl_station_priv, lq_sta);
2611         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
2612
2613         priv = lq_sta->drv;
2614         memset(buf, 0, sizeof(buf));
2615         buf_size = min(count, sizeof(buf) -  1);
2616         if (copy_from_user(buf, user_buf, buf_size))
2617                 return -EFAULT;
2618
2619         if (sscanf(buf, "%x", &parsed_rate) == 1)
2620                 lq_sta->dbg_fixed_rate = parsed_rate;
2621         else
2622                 lq_sta->dbg_fixed_rate = 0;
2623
2624         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
2625         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2626         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2627
2628         IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
2629                 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2630
2631         if (lq_sta->dbg_fixed_rate) {
2632                 iwl4965_rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2633                 iwl_legacy_send_lq_cmd(lq_sta->drv, ctx, &lq_sta->lq, CMD_ASYNC,
2634                                 false);
2635         }
2636
2637         return count;
2638 }
2639
2640 static ssize_t iwl4965_rs_sta_dbgfs_scale_table_read(struct file *file,
2641                         char __user *user_buf, size_t count, loff_t *ppos)
2642 {
2643         char *buff;
2644         int desc = 0;
2645         int i = 0;
2646         int index = 0;
2647         ssize_t ret;
2648
2649         struct iwl_lq_sta *lq_sta = file->private_data;
2650         struct iwl_priv *priv;
2651         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2652
2653         priv = lq_sta->drv;
2654         buff = kmalloc(1024, GFP_KERNEL);
2655         if (!buff)
2656                 return -ENOMEM;
2657
2658         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2659         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2660                         lq_sta->total_failed, lq_sta->total_success,
2661                         lq_sta->active_legacy_rate);
2662         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2663                         lq_sta->dbg_fixed_rate);
2664         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
2665             (priv->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
2666             (priv->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
2667             (priv->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
2668         desc += sprintf(buff+desc, "lq type %s\n",
2669            (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
2670         if (is_Ht(tbl->lq_type)) {
2671                 desc += sprintf(buff+desc, " %s",
2672                    (is_siso(tbl->lq_type)) ? "SISO" : "MIMO2");
2673                    desc += sprintf(buff+desc, " %s",
2674                    (tbl->is_ht40) ? "40MHz" : "20MHz");
2675                    desc += sprintf(buff+desc, " %s %s %s\n",
2676                         (tbl->is_SGI) ? "SGI" : "",
2677                    (lq_sta->is_green) ? "GF enabled" : "",
2678                    (lq_sta->is_agg) ? "AGG on" : "");
2679         }
2680         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
2681                 lq_sta->last_rate_n_flags);
2682         desc += sprintf(buff+desc, "general:"
2683                 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2684                 lq_sta->lq.general_params.flags,
2685                 lq_sta->lq.general_params.mimo_delimiter,
2686                 lq_sta->lq.general_params.single_stream_ant_msk,
2687                 lq_sta->lq.general_params.dual_stream_ant_msk);
2688
2689         desc += sprintf(buff+desc, "agg:"
2690                         "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2691                         le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2692                         lq_sta->lq.agg_params.agg_dis_start_th,
2693                         lq_sta->lq.agg_params.agg_frame_cnt_limit);
2694
2695         desc += sprintf(buff+desc,
2696                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2697                         lq_sta->lq.general_params.start_rate_index[0],
2698                         lq_sta->lq.general_params.start_rate_index[1],
2699                         lq_sta->lq.general_params.start_rate_index[2],
2700                         lq_sta->lq.general_params.start_rate_index[3]);
2701
2702         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2703                 index = iwl4965_hwrate_to_plcp_idx(
2704                         le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2705                 if (is_legacy(tbl->lq_type)) {
2706                         desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
2707                         i,
2708                         le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
2709                         iwl_rate_mcs[index].mbps);
2710                 } else {
2711                         desc += sprintf(buff+desc,
2712                         " rate[%d] 0x%X %smbps (%s)\n",
2713                         i,
2714                         le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
2715                         iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
2716                 }
2717         }
2718
2719         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2720         kfree(buff);
2721         return ret;
2722 }
2723
2724 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2725         .write = iwl4965_rs_sta_dbgfs_scale_table_write,
2726         .read = iwl4965_rs_sta_dbgfs_scale_table_read,
2727         .open = iwl4965_open_file_generic,
2728         .llseek = default_llseek,
2729 };
2730 static ssize_t iwl4965_rs_sta_dbgfs_stats_table_read(struct file *file,
2731                         char __user *user_buf, size_t count, loff_t *ppos)
2732 {
2733         char *buff;
2734         int desc = 0;
2735         int i, j;
2736         ssize_t ret;
2737
2738         struct iwl_lq_sta *lq_sta = file->private_data;
2739
2740         buff = kmalloc(1024, GFP_KERNEL);
2741         if (!buff)
2742                 return -ENOMEM;
2743
2744         for (i = 0; i < LQ_SIZE; i++) {
2745                 desc += sprintf(buff+desc,
2746                                 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
2747                                 "rate=0x%X\n",
2748                                 lq_sta->active_tbl == i ? "*" : "x",
2749                                 lq_sta->lq_info[i].lq_type,
2750                                 lq_sta->lq_info[i].is_SGI,
2751                                 lq_sta->lq_info[i].is_ht40,
2752                                 lq_sta->lq_info[i].is_dup,
2753                                 lq_sta->is_green,
2754                                 lq_sta->lq_info[i].current_rate);
2755                 for (j = 0; j < IWL_RATE_COUNT; j++) {
2756                         desc += sprintf(buff+desc,
2757                                 "counter=%d success=%d %%=%d\n",
2758                                 lq_sta->lq_info[i].win[j].counter,
2759                                 lq_sta->lq_info[i].win[j].success_counter,
2760                                 lq_sta->lq_info[i].win[j].success_ratio);
2761                 }
2762         }
2763         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2764         kfree(buff);
2765         return ret;
2766 }
2767
2768 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2769         .read = iwl4965_rs_sta_dbgfs_stats_table_read,
2770         .open = iwl4965_open_file_generic,
2771         .llseek = default_llseek,
2772 };
2773
2774 static ssize_t iwl4965_rs_sta_dbgfs_rate_scale_data_read(struct file *file,
2775                         char __user *user_buf, size_t count, loff_t *ppos)
2776 {
2777         char buff[120];
2778         int desc = 0;
2779         ssize_t ret;
2780
2781         struct iwl_lq_sta *lq_sta = file->private_data;
2782         struct iwl_priv *priv;
2783         struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
2784
2785         priv = lq_sta->drv;
2786
2787         if (is_Ht(tbl->lq_type))
2788                 desc += sprintf(buff+desc,
2789                                 "Bit Rate= %d Mb/s\n",
2790                                 tbl->expected_tpt[lq_sta->last_txrate_idx]);
2791         else
2792                 desc += sprintf(buff+desc,
2793                                 "Bit Rate= %d Mb/s\n",
2794                                 iwlegacy_rates[lq_sta->last_txrate_idx].ieee >> 1);
2795
2796         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2797         return ret;
2798 }
2799
2800 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
2801         .read = iwl4965_rs_sta_dbgfs_rate_scale_data_read,
2802         .open = iwl4965_open_file_generic,
2803         .llseek = default_llseek,
2804 };
2805
2806 static void iwl4965_rs_add_debugfs(void *priv, void *priv_sta,
2807                                         struct dentry *dir)
2808 {
2809         struct iwl_lq_sta *lq_sta = priv_sta;
2810         lq_sta->rs_sta_dbgfs_scale_table_file =
2811                 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
2812                                 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2813         lq_sta->rs_sta_dbgfs_stats_table_file =
2814                 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
2815                         lq_sta, &rs_sta_dbgfs_stats_table_ops);
2816         lq_sta->rs_sta_dbgfs_rate_scale_data_file =
2817                 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
2818                         lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
2819         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2820                 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
2821                 &lq_sta->tx_agg_tid_en);
2822
2823 }
2824
2825 static void iwl4965_rs_remove_debugfs(void *priv, void *priv_sta)
2826 {
2827         struct iwl_lq_sta *lq_sta = priv_sta;
2828         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2829         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2830         debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
2831         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2832 }
2833 #endif
2834
2835 /*
2836  * Initialization of rate scaling information is done by driver after
2837  * the station is added. Since mac80211 calls this function before a
2838  * station is added we ignore it.
2839  */
2840 static void
2841 iwl4965_rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband,
2842                          struct ieee80211_sta *sta, void *priv_sta)
2843 {
2844 }
2845 static struct rate_control_ops rs_4965_ops = {
2846         .module = NULL,
2847         .name = IWL4965_RS_NAME,
2848         .tx_status = iwl4965_rs_tx_status,
2849         .get_rate = iwl4965_rs_get_rate,
2850         .rate_init = iwl4965_rs_rate_init_stub,
2851         .alloc = iwl4965_rs_alloc,
2852         .free = iwl4965_rs_free,
2853         .alloc_sta = iwl4965_rs_alloc_sta,
2854         .free_sta = iwl4965_rs_free_sta,
2855 #ifdef CONFIG_MAC80211_DEBUGFS
2856         .add_sta_debugfs = iwl4965_rs_add_debugfs,
2857         .remove_sta_debugfs = iwl4965_rs_remove_debugfs,
2858 #endif
2859 };
2860
2861 int iwl4965_rate_control_register(void)
2862 {
2863         return ieee80211_rate_control_register(&rs_4965_ops);
2864 }
2865
2866 void iwl4965_rate_control_unregister(void)
2867 {
2868         ieee80211_rate_control_unregister(&rs_4965_ops);
2869 }