Pileus Git - ~andy/linux/blob - drivers/net/wireless/iwlwifi/iwl-4965-rs.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2008 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  * James P. Ketrenos <ipw2100-admin@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/wireless.h>
  30 #include <net/mac80211.h>
  31
  32 #include <linux/netdevice.h>
  33 #include <linux/etherdevice.h>
  34 #include <linux/delay.h>
  35
  36 #include <linux/workqueue.h>
  37
  38 #include "../net/mac80211/rate.h"
  39
  40 #include "iwl-4965.h"
  41 #include "iwl-core.h"
  42 #include "iwl-helpers.h"
  43
  44 #define RS_NAME "iwl-4965-rs"
  45
  46 #define NUM_TRY_BEFORE_ANTENNA_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 time to accum history 2 seconds */
  55 #define IWL_RATE_SCALE_FLUSH_INTVL   (2*HZ)
  56
  57 static u8 rs_ht_to_legacy[] = {
  58         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  59         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  60         IWL_RATE_6M_INDEX,
  61         IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
  62         IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
  63         IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
  64         IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
  65 };
  66
  67 struct iwl4965_rate {
  68         u32 rate_n_flags;
  69 } __attribute__ ((packed));
  70
  71 /**
  72  * struct iwl4965_rate_scale_data -- tx success history for one rate
  73  */
  74 struct iwl4965_rate_scale_data {
  75         u64 data;               /* bitmap of successful frames */
  76         s32 success_counter;    /* number of frames successful */
  77         s32 success_ratio;      /* per-cent * 128  */
  78         s32 counter;            /* number of frames attempted */
  79         s32 average_tpt;        /* success ratio * expected throughput */
  80         unsigned long stamp;
  81 };
  82
  83 /**
  84  * struct iwl4965_scale_tbl_info -- tx params and success history for all rates
  85  *
  86  * There are two of these in struct iwl4965_lq_sta,
  87  * one for "active", and one for "search".
  88  */
  89 struct iwl4965_scale_tbl_info {
  90         enum iwl_table_type lq_type;
  91         u8 ant_type;
  92         u8 is_SGI;      /* 1 = short guard interval */
  93         u8 is_fat;      /* 1 = 40 MHz channel width */
  94         u8 is_dup;      /* 1 = duplicated data streams */
  95         u8 action;      /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
  96         s32 *expected_tpt;      /* throughput metrics; expected_tpt_G, etc. */
  97         struct iwl4965_rate current_rate;  /* rate_n_flags, uCode API format */
  98         struct iwl4965_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
  99 };
 100
 101 #ifdef CONFIG_IWL4965_HT
 102
 103 struct iwl4965_traffic_load {
 104         unsigned long time_stamp;       /* age of the oldest statistics */
 105         u32 packet_count[TID_QUEUE_MAX_SIZE];   /* packet count in this time
 106                                                  * slice */
 107         u32 total;                      /* total num of packets during the
 108                                          * last TID_MAX_TIME_DIFF */
 109         u8 queue_count;                 /* number of queues that has
 110                                          * been used since the last cleanup */
 111         u8 head;                        /* start of the circular buffer */
 112 };
 113
 114 #endif /* CONFIG_IWL4965_HT */
 115
 116 /**
 117  * struct iwl4965_lq_sta -- driver's rate scaling private structure
 118  *
 119  * Pointer to this gets passed back and forth between driver and mac80211.
 120  */
 121 struct iwl4965_lq_sta {
 122         u8 active_tbl;          /* index of active table, range 0-1 */
 123         u8 enable_counter;      /* indicates HT mode */
 124         u8 stay_in_tbl;         /* 1: disallow, 0: allow search for new mode */
 125         u8 search_better_tbl;   /* 1: currently trying alternate mode */
 126         s32 last_tpt;
 127
 128         /* The following determine when to search for a new mode */
 129         u32 table_count_limit;
 130         u32 max_failure_limit;  /* # failed frames before new search */
 131         u32 max_success_limit;  /* # successful frames before new search */
 132         u32 table_count;
 133         u32 total_failed;       /* total failed frames, any/all rates */
 134         u32 total_success;      /* total successful frames, any/all rates */
 135         u32 flush_timer;        /* time staying in mode before new search */
 136
 137         u8 action_counter;      /* # mode-switch actions tried */
 138         u8 antenna;
 139         u8 valid_antenna;
 140         u8 is_green;
 141         u8 is_dup;
 142         enum ieee80211_band band;
 143         u8 ibss_sta_added;
 144
 145         /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
 146         u32 supp_rates;
 147         u16 active_rate;
 148         u16 active_siso_rate;
 149         u16 active_mimo2_rate;
 150         u16 active_mimo3_rate;
 151         u16 active_rate_basic;
 152
 153         struct iwl_link_quality_cmd lq;
 154         struct iwl4965_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
 155 #ifdef CONFIG_IWL4965_HT
 156         struct iwl4965_traffic_load load[TID_MAX_LOAD_COUNT];
 157         u8 tx_agg_tid_en;
 158 #endif
 159 #ifdef CONFIG_MAC80211_DEBUGFS
 160         struct dentry *rs_sta_dbgfs_scale_table_file;
 161         struct dentry *rs_sta_dbgfs_stats_table_file;
 162 #ifdef CONFIG_IWL4965_HT
 163         struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
 164 #endif
 165         struct iwl4965_rate dbg_fixed;
 166         struct iwl_priv *drv;
 167 #endif
 168 };
 169
 170 static void rs_rate_scale_perform(struct iwl_priv *priv,
 171                                    struct net_device *dev,
 172                                    struct ieee80211_hdr *hdr,
 173                                    struct sta_info *sta);
 174 static void rs_fill_link_cmd(const struct iwl_priv *priv,
 175                              struct iwl4965_lq_sta *lq_sta,
 176                              struct iwl4965_rate *tx_mcs,
 177                              struct iwl_link_quality_cmd *tbl);
 178
 179
 180 #ifdef CONFIG_MAC80211_DEBUGFS
 181 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
 182                                 struct iwl4965_rate *mcs, int index);
 183 #else
 184 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
 185                                 struct iwl4965_rate *mcs, int index)
 186 {}
 187 #endif
 188
 189 /*
 190  * Expected throughput metrics for following rates:
 191  * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 192  * "G" is the only table that supports CCK (the first 4 rates).
 193  */
 194 /*FIXME:RS:need to spearate tables for MIMO2/MIMO3*/
 195 static s32 expected_tpt_A[IWL_RATE_COUNT] = {
 196         0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
 197 };
 198
 199 static s32 expected_tpt_G[IWL_RATE_COUNT] = {
 200         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
 201 };
 202
 203 static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
 204         0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
 205 };
 206
 207 static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
 208         0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
 209 };
 210
 211 static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
 212         0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
 213 };
 214
 215 static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
 216         0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
 217 };
 218
 219 static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
 220         0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
 221 };
 222
 223 static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
 224         0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
 225 };
 226
 227 static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
 228         0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
 229 };
 230
 231 static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
 232         0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
 233 };
 234
 235 static inline u8 iwl4965_rate_get_rate(u32 rate_n_flags)
 236 {
 237         return (u8)(rate_n_flags & 0xFF);
 238 }
 239
 240 static void rs_rate_scale_clear_window(struct iwl4965_rate_scale_data *window)
 241 {
 242         window->data = 0;
 243         window->success_counter = 0;
 244         window->success_ratio = IWL_INVALID_VALUE;
 245         window->counter = 0;
 246         window->average_tpt = IWL_INVALID_VALUE;
 247         window->stamp = 0;
 248 }
 249
 250 #ifdef CONFIG_IWL4965_HT
 251 /*
 252  *      removes the old data from the statistics. All data that is older than
 253  *      TID_MAX_TIME_DIFF, will be deleted.
 254  */
 255 static void rs_tl_rm_old_stats(struct iwl4965_traffic_load *tl, u32 curr_time)
 256 {
 257         /* The oldest age we want to keep */
 258         u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
 259
 260         while (tl->queue_count &&
 261                (tl->time_stamp < oldest_time)) {
 262                 tl->total -= tl->packet_count[tl->head];
 263                 tl->packet_count[tl->head] = 0;
 264                 tl->time_stamp += TID_QUEUE_CELL_SPACING;
 265                 tl->queue_count--;
 266                 tl->head++;
 267                 if (tl->head >= TID_QUEUE_MAX_SIZE)
 268                         tl->head = 0;
 269         }
 270 }
 271
 272 /*
 273  *      increment traffic load value for tid and also remove
 274  *      any old values if passed the certain time period
 275  */
 276 static void rs_tl_add_packet(struct iwl4965_lq_sta *lq_data, u8 tid)
 277 {
 278         u32 curr_time = jiffies_to_msecs(jiffies);
 279         u32 time_diff;
 280         s32 index;
 281         struct iwl4965_traffic_load *tl = NULL;
 282
 283         if (tid >= TID_MAX_LOAD_COUNT)
 284                 return;
 285
 286         tl = &lq_data->load[tid];
 287
 288         curr_time -= curr_time % TID_ROUND_VALUE;
 289
 290         /* Happens only for the first packet. Initialize the data */
 291         if (!(tl->queue_count)) {
 292                 tl->total = 1;
 293                 tl->time_stamp = curr_time;
 294                 tl->queue_count = 1;
 295                 tl->head = 0;
 296                 tl->packet_count[0] = 1;
 297                 return;
 298         }
 299
 300         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 301         index = time_diff / TID_QUEUE_CELL_SPACING;
 302
 303         /* The history is too long: remove data that is older than */
 304         /* TID_MAX_TIME_DIFF */
 305         if (index >= TID_QUEUE_MAX_SIZE)
 306                 rs_tl_rm_old_stats(tl, curr_time);
 307
 308         index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
 309         tl->packet_count[index] = tl->packet_count[index] + 1;
 310         tl->total = tl->total + 1;
 311
 312         if ((index + 1) > tl->queue_count)
 313                 tl->queue_count = index + 1;
 314 }
 315
 316 /*
 317         get the traffic load value for tid
 318 */
 319 static u32 rs_tl_get_load(struct iwl4965_lq_sta *lq_data, u8 tid)
 320 {
 321         u32 curr_time = jiffies_to_msecs(jiffies);
 322         u32 time_diff;
 323         s32 index;
 324         struct iwl4965_traffic_load *tl = NULL;
 325
 326         if (tid >= TID_MAX_LOAD_COUNT)
 327                 return 0;
 328
 329         tl = &(lq_data->load[tid]);
 330
 331         curr_time -= curr_time % TID_ROUND_VALUE;
 332
 333         if (!(tl->queue_count))
 334                 return 0;
 335
 336         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 337         index = time_diff / TID_QUEUE_CELL_SPACING;
 338
 339         /* The history is too long: remove data that is older than */
 340         /* TID_MAX_TIME_DIFF */
 341         if (index >= TID_QUEUE_MAX_SIZE)
 342                 rs_tl_rm_old_stats(tl, curr_time);
 343
 344         return tl->total;
 345 }
 346
 347 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
 348                                 struct iwl4965_lq_sta *lq_data, u8 tid,
 349                                 struct sta_info *sta)
 350 {
 351         unsigned long state;
 352         DECLARE_MAC_BUF(mac);
 353
 354         spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
 355         state = sta->ampdu_mlme.tid_state_tx[tid];
 356         spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
 357
 358         if (state == HT_AGG_STATE_IDLE &&
 359             rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
 360                 IWL_DEBUG_HT("Starting Tx agg: STA: %s tid: %d\n",
 361                                 print_mac(mac, sta->addr), tid);
 362                 ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
 363         }
 364 }
 365
 366 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
 367                                 struct iwl4965_lq_sta *lq_data,
 368                                 struct sta_info *sta)
 369 {
 370         if ((tid < TID_MAX_LOAD_COUNT))
 371                 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 372         else if (tid == IWL_AGG_ALL_TID)
 373                 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
 374                         rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 375 }
 376
 377 #endif /* CONFIG_IWLWIFI_HT */
 378
 379 static inline int get_num_of_ant_from_mcs(u32 mcs)
 380 {
 381         return (!!(mcs & RATE_MCS_ANT_A_MSK) +
 382                 !!(mcs & RATE_MCS_ANT_B_MSK) +
 383                 !!(mcs & RATE_MCS_ANT_C_MSK));
 384 }
 385
 386 /**
 387  * rs_collect_tx_data - Update the success/failure sliding window
 388  *
 389  * We keep a sliding window of the last 62 packets transmitted
 390  * at this rate.  window->data contains the bitmask of successful
 391  * packets.
 392  */
 393 static int rs_collect_tx_data(struct iwl4965_rate_scale_data *windows,
 394                               int scale_index, s32 tpt, int retries,
 395                               int successes)
 396 {
 397         struct iwl4965_rate_scale_data *window = NULL;
 398         u64 mask;
 399         u8 win_size = IWL_RATE_MAX_WINDOW;
 400         s32 fail_count;
 401
 402         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 403                 return -EINVAL;
 404
 405         /* Select data for current tx bit rate */
 406         window = &(windows[scale_index]);
 407
 408         /*
 409          * Keep track of only the latest 62 tx frame attempts in this rate's
 410          * history window; anything older isn't really relevant any more.
 411          * If we have filled up the sliding window, drop the oldest attempt;
 412          * if the oldest attempt (highest bit in bitmap) shows "success",
 413          * subtract "1" from the success counter (this is the main reason
 414          * we keep these bitmaps!).
 415          */
 416         while (retries > 0) {
 417                 if (window->counter >= win_size) {
 418                         window->counter = win_size - 1;
 419                         mask = 1;
 420                         mask = (mask << (win_size - 1));
 421                         if (window->data & mask) {
 422                                 window->data &= ~mask;
 423                                 window->success_counter =
 424                                         window->success_counter - 1;
 425                         }
 426                 }
 427
 428                 /* Increment frames-attempted counter */
 429                 window->counter++;
 430
 431                 /* Shift bitmap by one frame (throw away oldest history),
 432                  * OR in "1", and increment "success" if this
 433                  * frame was successful. */
 434                 mask = window->data;
 435                 window->data = (mask << 1);
 436                 if (successes > 0) {
 437                         window->success_counter = window->success_counter + 1;
 438                         window->data |= 0x1;
 439                         successes--;
 440                 }
 441
 442                 retries--;
 443         }
 444
 445         /* Calculate current success ratio, avoid divide-by-0! */
 446         if (window->counter > 0)
 447                 window->success_ratio = 128 * (100 * window->success_counter)
 448                                         / window->counter;
 449         else
 450                 window->success_ratio = IWL_INVALID_VALUE;
 451
 452         fail_count = window->counter - window->success_counter;
 453
 454         /* Calculate average throughput, if we have enough history. */
 455         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 456             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 457                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 458         else
 459                 window->average_tpt = IWL_INVALID_VALUE;
 460
 461         /* Tag this window as having been updated */
 462         window->stamp = jiffies;
 463
 464         return 0;
 465 }
 466
 467 /*
 468  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
 469  */
 470 static void rs_mcs_from_tbl(struct iwl4965_rate *mcs_rate,
 471                            struct iwl4965_scale_tbl_info *tbl,
 472                            int index, u8 use_green)
 473 {
 474         if (is_legacy(tbl->lq_type)) {
 475                 mcs_rate->rate_n_flags = iwl4965_rates[index].plcp;
 476                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 477                         mcs_rate->rate_n_flags |= RATE_MCS_CCK_MSK;
 478
 479         } else if (is_Ht(tbl->lq_type)) {
 480                 if (index > IWL_LAST_OFDM_RATE) {
 481                         IWL_ERROR("invalid HT rate index %d\n", index);
 482                         index = IWL_LAST_OFDM_RATE;
 483                 }
 484                 mcs_rate->rate_n_flags = RATE_MCS_HT_MSK;
 485
 486                 if (is_siso(tbl->lq_type))
 487                         mcs_rate->rate_n_flags |=
 488                                         iwl4965_rates[index].plcp_siso;
 489                 else if (is_mimo2(tbl->lq_type))
 490                         mcs_rate->rate_n_flags |=
 491                                         iwl4965_rates[index].plcp_mimo2;
 492                 else
 493                         mcs_rate->rate_n_flags |=
 494                                         iwl4965_rates[index].plcp_mimo3;
 495         } else {
 496                 IWL_ERROR("Invalid tbl->lq_type %d\n", tbl->lq_type);
 497         }
 498
 499         mcs_rate->rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
 500                                                      RATE_MCS_ANT_ABC_MSK);
 501
 502         if (is_legacy(tbl->lq_type))
 503                 return;
 504
 505         if (tbl->is_fat) {
 506                 if (tbl->is_dup)
 507                         mcs_rate->rate_n_flags |= RATE_MCS_DUP_MSK;
 508                 else
 509                         mcs_rate->rate_n_flags |= RATE_MCS_FAT_MSK;
 510         }
 511         if (tbl->is_SGI)
 512                 mcs_rate->rate_n_flags |= RATE_MCS_SGI_MSK;
 513
 514         if (use_green) {
 515                 mcs_rate->rate_n_flags |= RATE_MCS_GF_MSK;
 516                 if (is_siso(tbl->lq_type))
 517                         mcs_rate->rate_n_flags &= ~RATE_MCS_SGI_MSK;
 518         }
 519 }
 520
 521 /*
 522  * Interpret uCode API's rate_n_flags format,
 523  * fill "search" or "active" tx mode table.
 524  */
 525 static int rs_get_tbl_info_from_mcs(const struct iwl4965_rate *mcs_rate,
 526                                     enum ieee80211_band band,
 527                                     struct iwl4965_scale_tbl_info *tbl,
 528                                     int *rate_idx)
 529 {
 530         u32 ant_msk = (mcs_rate->rate_n_flags & RATE_MCS_ANT_ABC_MSK);
 531         u8 num_of_ant = get_num_of_ant_from_mcs(ant_msk);
 532
 533         *rate_idx = iwl4965_hwrate_to_plcp_idx(mcs_rate->rate_n_flags);
 534
 535         if (*rate_idx  == IWL_RATE_INVALID) {
 536                 *rate_idx = -1;
 537                 return -EINVAL;
 538         }
 539         tbl->is_SGI = 0;        /* default legacy setup */
 540         tbl->is_fat = 0;
 541         tbl->is_dup = 0;
 542         tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
 543         tbl->lq_type = LQ_NONE;
 544
 545         /* legacy rate format */
 546         if (!(mcs_rate->rate_n_flags & RATE_MCS_HT_MSK)) {
 547                 if (num_of_ant == 1) {
 548                         if (band == IEEE80211_BAND_5GHZ)
 549                                 tbl->lq_type = LQ_A;
 550                         else
 551                                 tbl->lq_type = LQ_G;
 552                 }
 553         /* HT rate format */
 554         } else {
 555                 if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK)
 556                         tbl->is_SGI = 1;
 557
 558                 if ((mcs_rate->rate_n_flags & RATE_MCS_FAT_MSK) ||
 559                     (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK))
 560                         tbl->is_fat = 1;
 561
 562                 if (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK)
 563                         tbl->is_dup = 1;
 564
 565                 /* SISO */
 566                 if (iwl4965_rate_get_rate(mcs_rate->rate_n_flags)
 567                                                 <= IWL_RATE_SISO_60M_PLCP) {
 568
 569                         if (num_of_ant == 1)
 570                                 tbl->lq_type = LQ_SISO; /*else NONE*/
 571                 /* MIMO2 */
 572                 } else if (iwl4965_rate_get_rate(mcs_rate->rate_n_flags)
 573                                                 <= IWL_RATE_MIMO2_60M_PLCP) {
 574                         if (num_of_ant == 2)
 575                                 tbl->lq_type = LQ_MIMO2;
 576                 /* MIMO3 */
 577                 } else {
 578                         if (num_of_ant == 3)
 579                                 tbl->lq_type = LQ_MIMO3;
 580                 }
 581         }
 582         return 0;
 583 }
 584 /* FIXME:RS: need to toggle also ANT_C, and also AB,AC,BC */
 585 static inline void rs_toggle_antenna(struct iwl4965_rate *new_rate,
 586                                      struct iwl4965_scale_tbl_info *tbl)
 587 {
 588         tbl->ant_type ^= ANT_AB;
 589         new_rate->rate_n_flags ^= (RATE_MCS_ANT_A_MSK|RATE_MCS_ANT_B_MSK);
 590 }
 591
 592 static inline u8 rs_use_green(struct iwl_priv *priv,
 593                               struct ieee80211_conf *conf)
 594 {
 595 #ifdef CONFIG_IWL4965_HT
 596         return ((conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) &&
 597                 priv->current_ht_config.is_green_field &&
 598                 !priv->current_ht_config.non_GF_STA_present);
 599 #endif  /* CONFIG_IWL4965_HT */
 600         return 0;
 601 }
 602
 603 /**
 604  * rs_get_supported_rates - get the available rates
 605  *
 606  * if management frame or broadcast frame only return
 607  * basic available rates.
 608  *
 609  */
 610 static void rs_get_supported_rates(struct iwl4965_lq_sta *lq_sta,
 611                                    struct ieee80211_hdr *hdr,
 612                                    enum iwl_table_type rate_type,
 613                                    u16 *data_rate)
 614 {
 615         if (is_legacy(rate_type))
 616                 *data_rate = lq_sta->active_rate;
 617         else {
 618                 if (is_siso(rate_type))
 619                         *data_rate = lq_sta->active_siso_rate;
 620                 else if (is_mimo2(rate_type))
 621                         *data_rate = lq_sta->active_mimo2_rate;
 622                 else
 623                         *data_rate = lq_sta->active_mimo3_rate;
 624         }
 625
 626         if (hdr && is_multicast_ether_addr(hdr->addr1) &&
 627             lq_sta->active_rate_basic) {
 628                 *data_rate = lq_sta->active_rate_basic;
 629         }
 630 }
 631
 632 static u16 rs_get_adjacent_rate(u8 index, u16 rate_mask, int rate_type)
 633 {
 634         u8 high = IWL_RATE_INVALID;
 635         u8 low = IWL_RATE_INVALID;
 636
 637         /* 802.11A or ht walks to the next literal adjacent rate in
 638          * the rate table */
 639         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 640                 int i;
 641                 u32 mask;
 642
 643                 /* Find the previous rate that is in the rate mask */
 644                 i = index - 1;
 645                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 646                         if (rate_mask & mask) {
 647                                 low = i;
 648                                 break;
 649                         }
 650                 }
 651
 652                 /* Find the next rate that is in the rate mask */
 653                 i = index + 1;
 654                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 655                         if (rate_mask & mask) {
 656                                 high = i;
 657                                 break;
 658                         }
 659                 }
 660
 661                 return (high << 8) | low;
 662         }
 663
 664         low = index;
 665         while (low != IWL_RATE_INVALID) {
 666                 low = iwl4965_rates[low].prev_rs;
 667                 if (low == IWL_RATE_INVALID)
 668                         break;
 669                 if (rate_mask & (1 << low))
 670                         break;
 671                 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
 672         }
 673
 674         high = index;
 675         while (high != IWL_RATE_INVALID) {
 676                 high = iwl4965_rates[high].next_rs;
 677                 if (high == IWL_RATE_INVALID)
 678                         break;
 679                 if (rate_mask & (1 << high))
 680                         break;
 681                 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
 682         }
 683
 684         return (high << 8) | low;
 685 }
 686
 687 static void rs_get_lower_rate(struct iwl4965_lq_sta *lq_sta,
 688                              struct iwl4965_scale_tbl_info *tbl, u8 scale_index,
 689                              u8 ht_possible, struct iwl4965_rate *mcs_rate)
 690 {
 691         s32 low;
 692         u16 rate_mask;
 693         u16 high_low;
 694         u8 switch_to_legacy = 0;
 695         u8 is_green = lq_sta->is_green;
 696
 697         /* check if we need to switch from HT to legacy rates.
 698          * assumption is that mandatory rates (1Mbps or 6Mbps)
 699          * are always supported (spec demand) */
 700         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
 701                 switch_to_legacy = 1;
 702                 scale_index = rs_ht_to_legacy[scale_index];
 703                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 704                         tbl->lq_type = LQ_A;
 705                 else
 706                         tbl->lq_type = LQ_G;
 707
 708                 if (num_of_ant(tbl->ant_type > 1))
 709                         tbl->ant_type = ANT_A;/*FIXME:RS*/
 710
 711                 tbl->is_fat = 0;
 712                 tbl->is_SGI = 0;
 713         }
 714
 715         rs_get_supported_rates(lq_sta, NULL, tbl->lq_type, &rate_mask);
 716
 717         /* Mask with station rate restriction */
 718         if (is_legacy(tbl->lq_type)) {
 719                 /* supp_rates has no CCK bits in A mode */
 720                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 721                         rate_mask  = (u16)(rate_mask &
 722                            (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
 723                 else
 724                         rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
 725         }
 726
 727         /* If we switched from HT to legacy, check current rate */
 728         if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
 729                 rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green);
 730                 return;
 731         }
 732
 733         high_low = rs_get_adjacent_rate(scale_index, rate_mask, tbl->lq_type);
 734         low = high_low & 0xff;
 735
 736         if (low != IWL_RATE_INVALID)
 737                 rs_mcs_from_tbl(mcs_rate, tbl, low, is_green);
 738         else
 739                 rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green);
 740 }
 741
 742 /*
 743  * mac80211 sends us Tx status
 744  */
 745 static void rs_tx_status(void *priv_rate, struct net_device *dev,
 746                          struct sk_buff *skb,
 747                          struct ieee80211_tx_status *tx_resp)
 748 {
 749         int status;
 750         u8 retries;
 751         int rs_index, index = 0;
 752         struct iwl4965_lq_sta *lq_sta;
 753         struct iwl_link_quality_cmd *table;
 754         struct sta_info *sta;
 755         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 756         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
 757         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 758         struct ieee80211_hw *hw = local_to_hw(local);
 759         struct iwl4965_rate_scale_data *window = NULL;
 760         struct iwl4965_rate_scale_data *search_win = NULL;
 761         struct iwl4965_rate tx_mcs;
 762         struct iwl4965_scale_tbl_info tbl_type;
 763         struct iwl4965_scale_tbl_info *curr_tbl, *search_tbl;
 764         u8 active_index = 0;
 765         u16 fc = le16_to_cpu(hdr->frame_control);
 766         s32 tpt = 0;
 767
 768         IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
 769
 770         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1))
 771                 return;
 772
 773         /* This packet was aggregated but doesn't carry rate scale info */
 774         if ((tx_resp->control.flags & IEEE80211_TXCTL_AMPDU) &&
 775             !(tx_resp->flags & IEEE80211_TX_STATUS_AMPDU))
 776                 return;
 777
 778         retries = tx_resp->retry_count;
 779
 780         if (retries > 15)
 781                 retries = 15;
 782
 783         rcu_read_lock();
 784
 785         sta = sta_info_get(local, hdr->addr1);
 786
 787         if (!sta || !sta->rate_ctrl_priv)
 788                 goto out;
 789
 790
 791         lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
 792
 793         if (!priv->lq_mngr.lq_ready)
 794                 goto out;
 795
 796         if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
 797             !lq_sta->ibss_sta_added)
 798                 goto out;
 799
 800         table = &lq_sta->lq;
 801         active_index = lq_sta->active_tbl;
 802
 803         lq_sta->antenna = lq_sta->valid_antenna;
 804
 805         curr_tbl = &(lq_sta->lq_info[active_index]);
 806         search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
 807         window = (struct iwl4965_rate_scale_data *)
 808             &(curr_tbl->win[0]);
 809         search_win = (struct iwl4965_rate_scale_data *)
 810             &(search_tbl->win[0]);
 811
 812         /*
 813          * Ignore this Tx frame response if its initial rate doesn't match
 814          * that of latest Link Quality command.  There may be stragglers
 815          * from a previous Link Quality command, but we're no longer interested
 816          * in those; they're either from the "active" mode while we're trying
 817          * to check "search" mode, or a prior "search" mode after we've moved
 818          * to a new "search" mode (which might become the new "active" mode).
 819          */
 820         tx_mcs.rate_n_flags = le32_to_cpu(table->rs_table[0].rate_n_flags);
 821         rs_get_tbl_info_from_mcs(&tx_mcs, priv->band, &tbl_type, &rs_index);
 822         if (priv->band == IEEE80211_BAND_5GHZ)
 823                 rs_index -= IWL_FIRST_OFDM_RATE;
 824
 825         if ((tx_resp->control.tx_rate == NULL) ||
 826             (tbl_type.is_SGI ^
 827                 !!(tx_resp->control.flags & IEEE80211_TXCTL_SHORT_GI)) ||
 828             (tbl_type.is_fat ^
 829                 !!(tx_resp->control.flags & IEEE80211_TXCTL_40_MHZ_WIDTH)) ||
 830             (tbl_type.is_dup ^
 831                 !!(tx_resp->control.flags & IEEE80211_TXCTL_DUP_DATA)) ||
 832             (tbl_type.ant_type ^ tx_resp->control.antenna_sel_tx) ||
 833             (!!(tx_mcs.rate_n_flags & RATE_MCS_HT_MSK) ^
 834                 !!(tx_resp->control.flags & IEEE80211_TXCTL_OFDM_HT)) ||
 835             (!!(tx_mcs.rate_n_flags & RATE_MCS_GF_MSK) ^
 836                 !!(tx_resp->control.flags & IEEE80211_TXCTL_GREEN_FIELD)) ||
 837             (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
 838                 tx_resp->control.tx_rate->bitrate)) {
 839                 IWL_DEBUG_RATE("initial rate does not match 0x%x\n",
 840                                 tx_mcs.rate_n_flags);
 841                 goto out;
 842         }
 843
 844         /* Update frame history window with "failure" for each Tx retry. */
 845         while (retries) {
 846                 /* Look up the rate and other info used for each tx attempt.
 847                  * Each tx attempt steps one entry deeper in the rate table. */
 848                 tx_mcs.rate_n_flags =
 849                     le32_to_cpu(table->rs_table[index].rate_n_flags);
 850                 rs_get_tbl_info_from_mcs(&tx_mcs, priv->band,
 851                                           &tbl_type, &rs_index);
 852
 853                 /* If type matches "search" table,
 854                  * add failure to "search" history */
 855                 if ((tbl_type.lq_type == search_tbl->lq_type) &&
 856                     (tbl_type.ant_type == search_tbl->ant_type) &&
 857                     (tbl_type.is_SGI == search_tbl->is_SGI)) {
 858                         if (search_tbl->expected_tpt)
 859                                 tpt = search_tbl->expected_tpt[rs_index];
 860                         else
 861                                 tpt = 0;
 862                         rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
 863
 864                 /* Else if type matches "current/active" table,
 865                  * add failure to "current/active" history */
 866                 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
 867                            (tbl_type.ant_type == curr_tbl->ant_type) &&
 868                            (tbl_type.is_SGI == curr_tbl->is_SGI)) {
 869                         if (curr_tbl->expected_tpt)
 870                                 tpt = curr_tbl->expected_tpt[rs_index];
 871                         else
 872                                 tpt = 0;
 873                         rs_collect_tx_data(window, rs_index, tpt, 1, 0);
 874                 }
 875
 876                 /* If not searching for a new mode, increment failed counter
 877                  * ... this helps determine when to start searching again */
 878                 if (lq_sta->stay_in_tbl)
 879                         lq_sta->total_failed++;
 880                 --retries;
 881                 index++;
 882
 883         }
 884
 885         /*
 886          * Find (by rate) the history window to update with final Tx attempt;
 887          * if Tx was successful first try, use original rate,
 888          * else look up the rate that was, finally, successful.
 889          */
 890         tx_mcs.rate_n_flags = le32_to_cpu(table->rs_table[index].rate_n_flags);
 891         rs_get_tbl_info_from_mcs(&tx_mcs, priv->band, &tbl_type, &rs_index);
 892
 893         /* Update frame history window with "success" if Tx got ACKed ... */
 894         if (tx_resp->flags & IEEE80211_TX_STATUS_ACK)
 895                 status = 1;
 896         else
 897                 status = 0;
 898
 899         /* If type matches "search" table,
 900          * add final tx status to "search" history */
 901         if ((tbl_type.lq_type == search_tbl->lq_type) &&
 902             (tbl_type.ant_type == search_tbl->ant_type) &&
 903             (tbl_type.is_SGI == search_tbl->is_SGI)) {
 904                 if (search_tbl->expected_tpt)
 905                         tpt = search_tbl->expected_tpt[rs_index];
 906                 else
 907                         tpt = 0;
 908                 if (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU)
 909                         rs_collect_tx_data(search_win, rs_index, tpt,
 910                                            tx_resp->ampdu_ack_len,
 911                                            tx_resp->ampdu_ack_map);
 912                 else
 913                         rs_collect_tx_data(search_win, rs_index, tpt,
 914                                            1, status);
 915         /* Else if type matches "current/active" table,
 916          * add final tx status to "current/active" history */
 917         } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
 918                    (tbl_type.ant_type == curr_tbl->ant_type) &&
 919                    (tbl_type.is_SGI == curr_tbl->is_SGI)) {
 920                 if (curr_tbl->expected_tpt)
 921                         tpt = curr_tbl->expected_tpt[rs_index];
 922                 else
 923                         tpt = 0;
 924                 if (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU)
 925                         rs_collect_tx_data(window, rs_index, tpt,
 926                                            tx_resp->ampdu_ack_len,
 927                                            tx_resp->ampdu_ack_map);
 928                 else
 929                         rs_collect_tx_data(window, rs_index, tpt,
 930                                            1, status);
 931         }
 932
 933         /* If not searching for new mode, increment success/failed counter
 934          * ... these help determine when to start searching again */
 935         if (lq_sta->stay_in_tbl) {
 936                 if (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU) {
 937                         lq_sta->total_success += tx_resp->ampdu_ack_map;
 938                         lq_sta->total_failed +=
 939                              (tx_resp->ampdu_ack_len - tx_resp->ampdu_ack_map);
 940                 } else {
 941                         if (status)
 942                                 lq_sta->total_success++;
 943                         else
 944                                 lq_sta->total_failed++;
 945                 }
 946         }
 947
 948         /* See if there's a better rate or modulation mode to try. */
 949         rs_rate_scale_perform(priv, dev, hdr, sta);
 950 out:
 951         rcu_read_unlock();
 952         return;
 953 }
 954
 955 static inline u8 rs_is_ant_connected(u8 valid_antenna, u8 ant_type)
 956 {
 957         return ((ant_type & valid_antenna) == ant_type);
 958 }
 959
 960 /*FIXME:RS: this function should be replaced*/
 961 static u8 rs_is_other_ant_connected(u8 valid_antenna, u8 ant_type)
 962 {
 963         if (ant_type == ANT_B)
 964                 return rs_is_ant_connected(valid_antenna, ANT_A);
 965         else
 966                 return rs_is_ant_connected(valid_antenna, ANT_B);
 967
 968         return 0;
 969 }
 970
 971 /*
 972  * Begin a period of staying with a selected modulation mode.
 973  * Set "stay_in_tbl" flag to prevent any mode switches.
 974  * Set frame tx success limits according to legacy vs. high-throughput,
 975  * and reset overall (spanning all rates) tx success history statistics.
 976  * These control how long we stay using same modulation mode before
 977  * searching for a new mode.
 978  */
 979 static void rs_set_stay_in_table(u8 is_legacy,
 980                                  struct iwl4965_lq_sta *lq_sta)
 981 {
 982         IWL_DEBUG_HT("we are staying in the same table\n");
 983         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
 984         if (is_legacy) {
 985                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
 986                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
 987                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
 988         } else {
 989                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
 990                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
 991                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
 992         }
 993         lq_sta->table_count = 0;
 994         lq_sta->total_failed = 0;
 995         lq_sta->total_success = 0;
 996 }
 997
 998 /*
 999  * Find correct throughput table for given mode of modulation
1000  */
1001 static void rs_get_expected_tpt_table(struct iwl4965_lq_sta *lq_sta,
1002                                       struct iwl4965_scale_tbl_info *tbl)
1003 {
1004         if (is_legacy(tbl->lq_type)) {
1005                 if (!is_a_band(tbl->lq_type))
1006                         tbl->expected_tpt = expected_tpt_G;
1007                 else
1008                         tbl->expected_tpt = expected_tpt_A;
1009         } else if (is_siso(tbl->lq_type)) {
1010                 if (tbl->is_fat && !lq_sta->is_dup)
1011                         if (tbl->is_SGI)
1012                                 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
1013                         else
1014                                 tbl->expected_tpt = expected_tpt_siso40MHz;
1015                 else if (tbl->is_SGI)
1016                         tbl->expected_tpt = expected_tpt_siso20MHzSGI;
1017                 else
1018                         tbl->expected_tpt = expected_tpt_siso20MHz;
1019
1020         } else if (is_mimo(tbl->lq_type)) { /* FIXME:need to separate mimo2/3 */
1021                 if (tbl->is_fat && !lq_sta->is_dup)
1022                         if (tbl->is_SGI)
1023                                 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
1024                         else
1025                                 tbl->expected_tpt = expected_tpt_mimo40MHz;
1026                 else if (tbl->is_SGI)
1027                         tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
1028                 else
1029                         tbl->expected_tpt = expected_tpt_mimo20MHz;
1030         } else
1031                 tbl->expected_tpt = expected_tpt_G;
1032 }
1033
1034 #ifdef CONFIG_IWL4965_HT
1035 /*
1036  * Find starting rate for new "search" high-throughput mode of modulation.
1037  * Goal is to find lowest expected rate (under perfect conditions) that is
1038  * above the current measured throughput of "active" mode, to give new mode
1039  * a fair chance to prove itself without too many challenges.
1040  *
1041  * This gets called when transitioning to more aggressive modulation
1042  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1043  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1044  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1045  * bit rate will typically need to increase, but not if performance was bad.
1046  */
1047 static s32 rs_get_best_rate(struct iwl_priv *priv,
1048                             struct iwl4965_lq_sta *lq_sta,
1049                             struct iwl4965_scale_tbl_info *tbl, /* "search" */
1050                             u16 rate_mask, s8 index, s8 rate)
1051 {
1052         /* "active" values */
1053         struct iwl4965_scale_tbl_info *active_tbl =
1054             &(lq_sta->lq_info[lq_sta->active_tbl]);
1055         s32 active_sr = active_tbl->win[index].success_ratio;
1056         s32 active_tpt = active_tbl->expected_tpt[index];
1057
1058         /* expected "search" throughput */
1059         s32 *tpt_tbl = tbl->expected_tpt;
1060
1061         s32 new_rate, high, low, start_hi;
1062         u16 high_low;
1063
1064         new_rate = high = low = start_hi = IWL_RATE_INVALID;
1065
1066         for (; ;) {
1067                 high_low = rs_get_adjacent_rate(rate, rate_mask, tbl->lq_type);
1068
1069                 low = high_low & 0xff;
1070                 high = (high_low >> 8) & 0xff;
1071
1072                 /*
1073                  * Lower the "search" bit rate, to give new "search" mode
1074                  * approximately the same throughput as "active" if:
1075                  *
1076                  * 1) "Active" mode has been working modestly well (but not
1077                  *    great), and expected "search" throughput (under perfect
1078                  *    conditions) at candidate rate is above the actual
1079                  *    measured "active" throughput (but less than expected
1080                  *    "active" throughput under perfect conditions).
1081                  * OR
1082                  * 2) "Active" mode has been working perfectly or very well
1083                  *    and expected "search" throughput (under perfect
1084                  *    conditions) at candidate rate is above expected
1085                  *    "active" throughput (under perfect conditions).
1086                  */
1087                 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1088                      ((active_sr > IWL_RATE_DECREASE_TH) &&
1089                       (active_sr <= IWL_RATE_HIGH_TH) &&
1090                       (tpt_tbl[rate] <= active_tpt))) ||
1091                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1092                      (tpt_tbl[rate] > active_tpt))) {
1093
1094                         /* (2nd or later pass)
1095                          * If we've already tried to raise the rate, and are
1096                          * now trying to lower it, use the higher rate. */
1097                         if (start_hi != IWL_RATE_INVALID) {
1098                                 new_rate = start_hi;
1099                                 break;
1100                         }
1101
1102                         new_rate = rate;
1103
1104                         /* Loop again with lower rate */
1105                         if (low != IWL_RATE_INVALID)
1106                                 rate = low;
1107
1108                         /* Lower rate not available, use the original */
1109                         else
1110                                 break;
1111
1112                 /* Else try to raise the "search" rate to match "active" */
1113                 } else {
1114                         /* (2nd or later pass)
1115                          * If we've already tried to lower the rate, and are
1116                          * now trying to raise it, use the lower rate. */
1117                         if (new_rate != IWL_RATE_INVALID)
1118                                 break;
1119
1120                         /* Loop again with higher rate */
1121                         else if (high != IWL_RATE_INVALID) {
1122                                 start_hi = high;
1123                                 rate = high;
1124
1125                         /* Higher rate not available, use the original */
1126                         } else {
1127                                 new_rate = rate;
1128                                 break;
1129                         }
1130                 }
1131         }
1132
1133         return new_rate;
1134 }
1135 #endif                          /* CONFIG_IWL4965_HT */
1136
1137 /*FIXME:RS:this function should be replaced*/
1138 static inline u8 rs_is_both_ant_supp(u8 valid_antenna)
1139 {
1140         return (rs_is_ant_connected(valid_antenna, ANT_AB));
1141 }
1142
1143 /*
1144  * Set up search table for MIMO
1145  */
1146 #ifdef CONFIG_IWL4965_HT
1147 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1148                              struct iwl4965_lq_sta *lq_sta,
1149                              struct ieee80211_conf *conf,
1150                              struct sta_info *sta,
1151                              struct iwl4965_scale_tbl_info *tbl, int index)
1152 {
1153         u16 rate_mask;
1154         s32 rate;
1155         s8 is_green = lq_sta->is_green;
1156
1157         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1158             !sta->ht_info.ht_supported)
1159                 return -1;
1160
1161         IWL_DEBUG_HT("LQ: try to switch to MIMO\n");
1162         tbl->lq_type = LQ_MIMO2;
1163         rs_get_supported_rates(lq_sta, NULL, tbl->lq_type,
1164                                 &rate_mask);
1165
1166         if (priv->current_ht_config.tx_mimo_ps_mode == IWL_MIMO_PS_STATIC)
1167                 return -1;
1168
1169         /* Need both Tx chains/antennas to support MIMO */
1170         if (!rs_is_both_ant_supp(priv->hw_params.valid_tx_ant))
1171                 return -1;
1172
1173         tbl->is_dup = lq_sta->is_dup;
1174         tbl->action = 0;
1175         if (priv->current_ht_config.supported_chan_width
1176             == IWL_CHANNEL_WIDTH_40MHZ)
1177                 tbl->is_fat = 1;
1178         else
1179                 tbl->is_fat = 0;
1180
1181         if (tbl->is_fat) {
1182                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1183                         tbl->is_SGI = 1;
1184                 else
1185                         tbl->is_SGI = 0;
1186         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1187                 tbl->is_SGI = 1;
1188         else
1189                 tbl->is_SGI = 0;
1190
1191         rs_get_expected_tpt_table(lq_sta, tbl);
1192
1193         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index, index);
1194
1195         IWL_DEBUG_HT("LQ: MIMO best rate %d mask %X\n", rate, rate_mask);
1196         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask))
1197                 return -1;
1198         rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green);
1199
1200         IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
1201                      tbl->current_rate.rate_n_flags, is_green);
1202         return 0;
1203 }
1204 #else
1205 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1206                              struct iwl4965_lq_sta *lq_sta,
1207                              struct ieee80211_conf *conf,
1208                              struct sta_info *sta,
1209                              struct iwl4965_scale_tbl_info *tbl, int index)
1210 {
1211         return -1;
1212 }
1213 #endif  /*CONFIG_IWL4965_HT */
1214
1215 /*
1216  * Set up search table for SISO
1217  */
1218 static int rs_switch_to_siso(struct iwl_priv *priv,
1219                              struct iwl4965_lq_sta *lq_sta,
1220                              struct ieee80211_conf *conf,
1221                              struct sta_info *sta,
1222                              struct iwl4965_scale_tbl_info *tbl, int index)
1223 {
1224 #ifdef CONFIG_IWL4965_HT
1225         u16 rate_mask;
1226         u8 is_green = lq_sta->is_green;
1227         s32 rate;
1228
1229         IWL_DEBUG_HT("LQ: try to switch to SISO\n");
1230         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1231             !sta->ht_info.ht_supported)
1232                 return -1;
1233
1234         tbl->is_dup = lq_sta->is_dup;
1235         tbl->lq_type = LQ_SISO;
1236         tbl->action = 0;
1237         rs_get_supported_rates(lq_sta, NULL, tbl->lq_type,
1238                                 &rate_mask);
1239
1240         if (priv->current_ht_config.supported_chan_width
1241             == IWL_CHANNEL_WIDTH_40MHZ)
1242                 tbl->is_fat = 1;
1243         else
1244                 tbl->is_fat = 0;
1245
1246         if (tbl->is_fat) {
1247                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1248                         tbl->is_SGI = 1;
1249                 else
1250                         tbl->is_SGI = 0;
1251         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1252                 tbl->is_SGI = 1;
1253         else
1254                 tbl->is_SGI = 0;
1255
1256         if (is_green)
1257                 tbl->is_SGI = 0;
1258
1259         rs_get_expected_tpt_table(lq_sta, tbl);
1260         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index, index);
1261
1262         IWL_DEBUG_HT("LQ: get best rate %d mask %X\n", rate, rate_mask);
1263         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1264                 IWL_DEBUG_HT("can not switch with index %d rate mask %x\n",
1265                              rate, rate_mask);
1266                 return -1;
1267         }
1268         rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green);
1269         IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
1270                      tbl->current_rate.rate_n_flags, is_green);
1271         return 0;
1272 #else
1273         return -1;
1274
1275 #endif  /*CONFIG_IWL4965_HT */
1276 }
1277
1278 /*
1279  * Try to switch to new modulation mode from legacy
1280  */
1281 static int rs_move_legacy_other(struct iwl_priv *priv,
1282                                 struct iwl4965_lq_sta *lq_sta,
1283                                 struct ieee80211_conf *conf,
1284                                 struct sta_info *sta,
1285                                 int index)
1286 {
1287         struct iwl4965_scale_tbl_info *tbl =
1288             &(lq_sta->lq_info[lq_sta->active_tbl]);
1289         struct iwl4965_scale_tbl_info *search_tbl =
1290             &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1291         struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1292         u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1293                   (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1294         u8 start_action = tbl->action;
1295         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1296         int ret = 0;
1297
1298         for (; ;) {
1299                 switch (tbl->action) {
1300                 case IWL_LEGACY_SWITCH_ANTENNA:
1301                         IWL_DEBUG_HT("LQ Legacy switch Antenna\n");
1302
1303                         search_tbl->lq_type = LQ_NONE;
1304                         lq_sta->action_counter++;
1305
1306                         /* Don't change antenna if success has been great */
1307                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1308                                 break;
1309
1310                         /* Don't change antenna if other one is not connected */
1311                         if (!rs_is_other_ant_connected(valid_tx_ant,
1312                                                         tbl->ant_type))
1313                                 break;
1314
1315                         /* Set up search table to try other antenna */
1316                         memcpy(search_tbl, tbl, sz);
1317
1318                         rs_toggle_antenna(&(search_tbl->current_rate),
1319                                            search_tbl);
1320                         rs_get_expected_tpt_table(lq_sta, search_tbl);
1321                         lq_sta->search_better_tbl = 1;
1322                         goto out;
1323
1324                 case IWL_LEGACY_SWITCH_SISO:
1325                         IWL_DEBUG_HT("LQ: Legacy switch to SISO\n");
1326
1327                         /* Set up search table to try SISO */
1328                         memcpy(search_tbl, tbl, sz);
1329                         search_tbl->lq_type = LQ_SISO;
1330                         search_tbl->is_SGI = 0;
1331                         search_tbl->is_fat = 0;
1332                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1333                                                  search_tbl, index);
1334                         if (!ret) {
1335                                 lq_sta->search_better_tbl = 1;
1336                                 lq_sta->action_counter = 0;
1337                                 goto out;
1338                         }
1339
1340                         break;
1341                 case IWL_LEGACY_SWITCH_MIMO2:
1342                         IWL_DEBUG_HT("LQ: Legacy switch MIMO\n");
1343
1344                         /* Set up search table to try MIMO */
1345                         memcpy(search_tbl, tbl, sz);
1346                         search_tbl->lq_type = LQ_MIMO2;
1347                         search_tbl->is_SGI = 0;
1348                         search_tbl->is_fat = 0;
1349                         search_tbl->ant_type = ANT_AB;/*FIXME:RS*/
1350                                 /*FIXME:RS:need to check ant validity*/
1351                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1352                                                  search_tbl, index);
1353                         if (!ret) {
1354                                 lq_sta->search_better_tbl = 1;
1355                                 lq_sta->action_counter = 0;
1356                                 goto out;
1357                         }
1358                         break;
1359                 }
1360                 tbl->action++;
1361                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2)
1362                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1363
1364                 if (tbl->action == start_action)
1365                         break;
1366
1367         }
1368         return 0;
1369
1370  out:
1371         tbl->action++;
1372         if (tbl->action > IWL_LEGACY_SWITCH_MIMO2)
1373                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1374         return 0;
1375
1376 }
1377
1378 /*
1379  * Try to switch to new modulation mode from SISO
1380  */
1381 static int rs_move_siso_to_other(struct iwl_priv *priv,
1382                                  struct iwl4965_lq_sta *lq_sta,
1383                                  struct ieee80211_conf *conf,
1384                                  struct sta_info *sta,
1385                                  int index)
1386 {
1387         u8 is_green = lq_sta->is_green;
1388         struct iwl4965_scale_tbl_info *tbl =
1389             &(lq_sta->lq_info[lq_sta->active_tbl]);
1390         struct iwl4965_scale_tbl_info *search_tbl =
1391             &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1392         struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1393         u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1394                   (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1395         u8 start_action = tbl->action;
1396         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1397         int ret;
1398
1399         for (;;) {
1400                 lq_sta->action_counter++;
1401                 switch (tbl->action) {
1402                 case IWL_SISO_SWITCH_ANTENNA:
1403                         IWL_DEBUG_HT("LQ: SISO SWITCH ANTENNA SISO\n");
1404                         search_tbl->lq_type = LQ_NONE;
1405                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1406                                 break;
1407                         if (!rs_is_other_ant_connected(valid_tx_ant,
1408                                                        tbl->ant_type))
1409                                 break;
1410
1411                         memcpy(search_tbl, tbl, sz);
1412                         search_tbl->action = IWL_SISO_SWITCH_MIMO2;
1413                         rs_toggle_antenna(&(search_tbl->current_rate),
1414                                            search_tbl);
1415                         lq_sta->search_better_tbl = 1;
1416
1417                         goto out;
1418
1419                 case IWL_SISO_SWITCH_MIMO2:
1420                         IWL_DEBUG_HT("LQ: SISO SWITCH TO MIMO2 FROM SISO\n");
1421                         memcpy(search_tbl, tbl, sz);
1422                         search_tbl->lq_type = LQ_MIMO2;
1423                         search_tbl->is_SGI = 0;
1424                         search_tbl->is_fat = 0;
1425                         search_tbl->ant_type = ANT_AB; /*FIXME:RS*/
1426                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1427                                                  search_tbl, index);
1428                         if (!ret) {
1429                                 lq_sta->search_better_tbl = 1;
1430                                 goto out;
1431                         }
1432                         break;
1433                 case IWL_SISO_SWITCH_GI:
1434                         IWL_DEBUG_HT("LQ: SISO SWITCH TO GI\n");
1435
1436                         memcpy(search_tbl, tbl, sz);
1437                         search_tbl->action = 0;
1438                         if (search_tbl->is_SGI)
1439                                 search_tbl->is_SGI = 0;
1440                         else if (!is_green)
1441                                 search_tbl->is_SGI = 1;
1442                         else
1443                                 break;
1444                         lq_sta->search_better_tbl = 1;
1445                         if ((tbl->lq_type == LQ_SISO) &&
1446                             (tbl->is_SGI)) {
1447                                 s32 tpt = lq_sta->last_tpt / 100;
1448                                 if (((!tbl->is_fat) &&
1449                                      (tpt >= expected_tpt_siso20MHz[index])) ||
1450                                     ((tbl->is_fat) &&
1451                                      (tpt >= expected_tpt_siso40MHz[index])))
1452                                         lq_sta->search_better_tbl = 0;
1453                         }
1454                         rs_get_expected_tpt_table(lq_sta, search_tbl);
1455                         rs_mcs_from_tbl(&search_tbl->current_rate,
1456                                              search_tbl, index, is_green);
1457                         goto out;
1458                 }
1459                 tbl->action++;
1460                 if (tbl->action > IWL_SISO_SWITCH_GI)
1461                         tbl->action = IWL_SISO_SWITCH_ANTENNA;
1462
1463                 if (tbl->action == start_action)
1464                         break;
1465         }
1466         return 0;
1467
1468  out:
1469         tbl->action++;
1470         if (tbl->action > IWL_SISO_SWITCH_GI)
1471                 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1472         return 0;
1473 }
1474
1475 /*
1476  * Try to switch to new modulation mode from MIMO
1477  */
1478 static int rs_move_mimo_to_other(struct iwl_priv *priv,
1479                                  struct iwl4965_lq_sta *lq_sta,
1480                                  struct ieee80211_conf *conf,
1481                                  struct sta_info *sta,
1482                                  int index)
1483 {
1484         int ret;
1485         s8 is_green = lq_sta->is_green;
1486         struct iwl4965_scale_tbl_info *tbl =
1487             &(lq_sta->lq_info[lq_sta->active_tbl]);
1488         struct iwl4965_scale_tbl_info *search_tbl =
1489             &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1490         u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1491                   (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1492         u8 start_action = tbl->action;
1493
1494         for (;;) {
1495                 lq_sta->action_counter++;
1496                 switch (tbl->action) {
1497                 case IWL_MIMO_SWITCH_ANTENNA_A:
1498                 case IWL_MIMO_SWITCH_ANTENNA_B:
1499                         IWL_DEBUG_HT("LQ: MIMO SWITCH TO SISO\n");
1500
1501
1502                         /* Set up new search table for SISO */
1503                         memcpy(search_tbl, tbl, sz);
1504                         search_tbl->lq_type = LQ_SISO;
1505                         search_tbl->is_SGI = 0;
1506                         search_tbl->is_fat = 0;
1507                                 /*FIXME:RS:need to check ant validity + C*/
1508                         if (tbl->action == IWL_MIMO_SWITCH_ANTENNA_A)
1509                                 search_tbl->ant_type = ANT_A;
1510                         else
1511                                 search_tbl->ant_type = ANT_B;
1512
1513                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1514                                                  search_tbl, index);
1515                         if (!ret) {
1516                                 lq_sta->search_better_tbl = 1;
1517                                 goto out;
1518                         }
1519                         break;
1520
1521                 case IWL_MIMO_SWITCH_GI:
1522                         IWL_DEBUG_HT("LQ: MIMO SWITCH TO GI\n");
1523
1524                         /* Set up new search table for MIMO */
1525                         memcpy(search_tbl, tbl, sz);
1526                         search_tbl->action = 0;
1527                         if (search_tbl->is_SGI)
1528                                 search_tbl->is_SGI = 0;
1529                         else
1530                                 search_tbl->is_SGI = 1;
1531                         lq_sta->search_better_tbl = 1;
1532
1533                         /*
1534                          * If active table already uses the fastest possible
1535                          * modulation (dual stream with short guard interval),
1536                          * and it's working well, there's no need to look
1537                          * for a better type of modulation!
1538                          */
1539                         if ((tbl->lq_type == LQ_MIMO2) &&
1540                             (tbl->is_SGI)) {
1541                                 s32 tpt = lq_sta->last_tpt / 100;
1542                                 if (((!tbl->is_fat) &&
1543                                      (tpt >= expected_tpt_mimo20MHz[index])) ||
1544                                     ((tbl->is_fat) &&
1545                                      (tpt >= expected_tpt_mimo40MHz[index])))
1546                                         lq_sta->search_better_tbl = 0;
1547                         }
1548                         rs_get_expected_tpt_table(lq_sta, search_tbl);
1549                         rs_mcs_from_tbl(&search_tbl->current_rate,
1550                                              search_tbl, index, is_green);
1551                         goto out;
1552
1553                 }
1554                 tbl->action++;
1555                 if (tbl->action > IWL_MIMO_SWITCH_GI)
1556                         tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1557
1558                 if (tbl->action == start_action)
1559                         break;
1560         }
1561
1562         return 0;
1563  out:
1564         tbl->action++;
1565         if (tbl->action > IWL_MIMO_SWITCH_GI)
1566                 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1567         return 0;
1568
1569 }
1570
1571 /*
1572  * Check whether we should continue using same modulation mode, or
1573  * begin search for a new mode, based on:
1574  * 1) # tx successes or failures while using this mode
1575  * 2) # times calling this function
1576  * 3) elapsed time in this mode (not used, for now)
1577  */
1578 static void rs_stay_in_table(struct iwl4965_lq_sta *lq_sta)
1579 {
1580         struct iwl4965_scale_tbl_info *tbl;
1581         int i;
1582         int active_tbl;
1583         int flush_interval_passed = 0;
1584
1585         active_tbl = lq_sta->active_tbl;
1586
1587         tbl = &(lq_sta->lq_info[active_tbl]);
1588
1589         /* If we've been disallowing search, see if we should now allow it */
1590         if (lq_sta->stay_in_tbl) {
1591
1592                 /* Elapsed time using current modulation mode */
1593                 if (lq_sta->flush_timer)
1594                         flush_interval_passed =
1595                             time_after(jiffies,
1596                                        (unsigned long)(lq_sta->flush_timer +
1597                                         IWL_RATE_SCALE_FLUSH_INTVL));
1598
1599                 /* For now, disable the elapsed time criterion */
1600                 flush_interval_passed = 0;
1601
1602                 /*
1603                  * Check if we should allow search for new modulation mode.
1604                  * If many frames have failed or succeeded, or we've used
1605                  * this same modulation for a long time, allow search, and
1606                  * reset history stats that keep track of whether we should
1607                  * allow a new search.  Also (below) reset all bitmaps and
1608                  * stats in active history.
1609                  */
1610                 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1611                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1612                     ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1613                      && (flush_interval_passed))) {
1614                         IWL_DEBUG_HT("LQ: stay is expired %d %d %d\n:",
1615                                      lq_sta->total_failed,
1616                                      lq_sta->total_success,
1617                                      flush_interval_passed);
1618
1619                         /* Allow search for new mode */
1620                         lq_sta->stay_in_tbl = 0;        /* only place reset */
1621                         lq_sta->total_failed = 0;
1622                         lq_sta->total_success = 0;
1623                         lq_sta->flush_timer = 0;
1624
1625                 /*
1626                  * Else if we've used this modulation mode enough repetitions
1627                  * (regardless of elapsed time or success/failure), reset
1628                  * history bitmaps and rate-specific stats for all rates in
1629                  * active table.
1630                  */
1631                 } else {
1632                         lq_sta->table_count++;
1633                         if (lq_sta->table_count >=
1634                             lq_sta->table_count_limit) {
1635                                 lq_sta->table_count = 0;
1636
1637                                 IWL_DEBUG_HT("LQ: stay in table clear win\n");
1638                                 for (i = 0; i < IWL_RATE_COUNT; i++)
1639                                         rs_rate_scale_clear_window(
1640                                                 &(tbl->win[i]));
1641                         }
1642                 }
1643
1644                 /* If transitioning to allow "search", reset all history
1645                  * bitmaps and stats in active table (this will become the new
1646                  * "search" table). */
1647                 if (!lq_sta->stay_in_tbl) {
1648                         for (i = 0; i < IWL_RATE_COUNT; i++)
1649                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1650                 }
1651         }
1652 }
1653
1654 /*
1655  * Do rate scaling and search for new modulation mode.
1656  */
1657 static void rs_rate_scale_perform(struct iwl_priv *priv,
1658                                   struct net_device *dev,
1659                                   struct ieee80211_hdr *hdr,
1660                                   struct sta_info *sta)
1661 {
1662         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1663         struct ieee80211_hw *hw = local_to_hw(local);
1664         struct ieee80211_conf *conf = &hw->conf;
1665         int low = IWL_RATE_INVALID;
1666         int high = IWL_RATE_INVALID;
1667         int index;
1668         int i;
1669         struct iwl4965_rate_scale_data *window = NULL;
1670         int current_tpt = IWL_INVALID_VALUE;
1671         int low_tpt = IWL_INVALID_VALUE;
1672         int high_tpt = IWL_INVALID_VALUE;
1673         u32 fail_count;
1674         s8 scale_action = 0;
1675         u16 fc, rate_mask;
1676         u8 update_lq = 0;
1677         struct iwl4965_lq_sta *lq_sta;
1678         struct iwl4965_scale_tbl_info *tbl, *tbl1;
1679         u16 rate_scale_index_msk = 0;
1680         struct iwl4965_rate mcs_rate;
1681         u8 is_green = 0;
1682         u8 active_tbl = 0;
1683         u8 done_search = 0;
1684         u16 high_low;
1685 #ifdef CONFIG_IWL4965_HT
1686         u8 tid = MAX_TID_COUNT;
1687         __le16 *qc;
1688 #endif
1689
1690         IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1691
1692         fc = le16_to_cpu(hdr->frame_control);
1693         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
1694                 /* Send management frames and broadcast/multicast data using
1695                  * lowest rate. */
1696                 /* TODO: this could probably be improved.. */
1697                 return;
1698         }
1699
1700         if (!sta || !sta->rate_ctrl_priv)
1701                 return;
1702
1703         if (!priv->lq_mngr.lq_ready) {
1704                 IWL_DEBUG_RATE("still rate scaling not ready\n");
1705                 return;
1706         }
1707         lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
1708
1709 #ifdef CONFIG_IWL4965_HT
1710         qc = ieee80211_get_qos_ctrl(hdr);
1711         if (qc) {
1712                 tid = (u8)(le16_to_cpu(*qc) & 0xf);
1713                 rs_tl_add_packet(lq_sta, tid);
1714         }
1715 #endif
1716         /*
1717          * Select rate-scale / modulation-mode table to work with in
1718          * the rest of this function:  "search" if searching for better
1719          * modulation mode, or "active" if doing rate scaling within a mode.
1720          */
1721         if (!lq_sta->search_better_tbl)
1722                 active_tbl = lq_sta->active_tbl;
1723         else
1724                 active_tbl = 1 - lq_sta->active_tbl;
1725
1726         tbl = &(lq_sta->lq_info[active_tbl]);
1727         is_green = lq_sta->is_green;
1728
1729         /* current tx rate */
1730         index = sta->last_txrate_idx;
1731
1732         IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1733                        tbl->lq_type);
1734
1735         /* rates available for this association, and for modulation mode */
1736         rs_get_supported_rates(lq_sta, hdr, tbl->lq_type,
1737                                 &rate_mask);
1738
1739         IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1740
1741         /* mask with station rate restriction */
1742         if (is_legacy(tbl->lq_type)) {
1743                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1744                         /* supp_rates has no CCK bits in A mode */
1745                         rate_scale_index_msk = (u16) (rate_mask &
1746                                 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1747                 else
1748                         rate_scale_index_msk = (u16) (rate_mask &
1749                                                       lq_sta->supp_rates);
1750
1751         } else
1752                 rate_scale_index_msk = rate_mask;
1753
1754         if (!rate_scale_index_msk)
1755                 rate_scale_index_msk = rate_mask;
1756
1757         /* If current rate is no longer supported on current association,
1758          * or user changed preferences for rates, find a new supported rate. */
1759         if (index < 0 || !((1 << index) & rate_scale_index_msk)) {
1760                 index = IWL_INVALID_VALUE;
1761                 update_lq = 1;
1762
1763                 /* get the highest available rate */
1764                 for (i = 0; i <= IWL_RATE_COUNT; i++) {
1765                         if ((1 << i) & rate_scale_index_msk)
1766                                 index = i;
1767                 }
1768
1769                 if (index == IWL_INVALID_VALUE) {
1770                         IWL_WARNING("Can not find a suitable rate\n");
1771                         return;
1772                 }
1773         }
1774
1775         /* Get expected throughput table and history window for current rate */
1776         if (!tbl->expected_tpt)
1777                 rs_get_expected_tpt_table(lq_sta, tbl);
1778
1779         window = &(tbl->win[index]);
1780
1781         /*
1782          * If there is not enough history to calculate actual average
1783          * throughput, keep analyzing results of more tx frames, without
1784          * changing rate or mode (bypass most of the rest of this function).
1785          * Set up new rate table in uCode only if old rate is not supported
1786          * in current association (use new rate found above).
1787          */
1788         fail_count = window->counter - window->success_counter;
1789         if (((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1790              (window->success_counter < IWL_RATE_MIN_SUCCESS_TH))
1791             || (tbl->expected_tpt == NULL)) {
1792                 IWL_DEBUG_RATE("LQ: still below TH succ %d total %d "
1793                                "for index %d\n",
1794                                window->success_counter, window->counter, index);
1795
1796                 /* Can't calculate this yet; not enough history */
1797                 window->average_tpt = IWL_INVALID_VALUE;
1798
1799                 /* Should we stay with this modulation mode,
1800                  * or search for a new one? */
1801                 rs_stay_in_table(lq_sta);
1802
1803                 /* Set up new rate table in uCode, if needed */
1804                 if (update_lq) {
1805                         rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green);
1806                         rs_fill_link_cmd(priv, lq_sta, &mcs_rate, &lq_sta->lq);
1807                         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1808                 }
1809                 goto out;
1810
1811         /* Else we have enough samples; calculate estimate of
1812          * actual average throughput */
1813         } else
1814                 window->average_tpt = ((window->success_ratio *
1815                                         tbl->expected_tpt[index] + 64) / 128);
1816
1817         /* If we are searching for better modulation mode, check success. */
1818         if (lq_sta->search_better_tbl) {
1819                 int success_limit = IWL_RATE_SCALE_SWITCH;
1820
1821                 /* If good success, continue using the "search" mode;
1822                  * no need to send new link quality command, since we're
1823                  * continuing to use the setup that we've been trying. */
1824                 if ((window->success_ratio > success_limit) ||
1825                     (window->average_tpt > lq_sta->last_tpt)) {
1826                         if (!is_legacy(tbl->lq_type)) {
1827                                 IWL_DEBUG_HT("LQ: we are switching to HT"
1828                                              " rate suc %d current tpt %d"
1829                                              " old tpt %d\n",
1830                                              window->success_ratio,
1831                                              window->average_tpt,
1832                                              lq_sta->last_tpt);
1833                                 lq_sta->enable_counter = 1;
1834                         }
1835                         /* Swap tables; "search" becomes "active" */
1836                         lq_sta->active_tbl = active_tbl;
1837                         current_tpt = window->average_tpt;
1838
1839                 /* Else poor success; go back to mode in "active" table */
1840                 } else {
1841                         /* Nullify "search" table */
1842                         tbl->lq_type = LQ_NONE;
1843
1844                         /* Revert to "active" table */
1845                         active_tbl = lq_sta->active_tbl;
1846                         tbl = &(lq_sta->lq_info[active_tbl]);
1847
1848                         /* Revert to "active" rate and throughput info */
1849                         index = iwl4965_hwrate_to_plcp_idx(
1850                                 tbl->current_rate.rate_n_flags);
1851                         current_tpt = lq_sta->last_tpt;
1852
1853                         /* Need to set up a new rate table in uCode */
1854                         update_lq = 1;
1855                         IWL_DEBUG_HT("XXY GO BACK TO OLD TABLE\n");
1856                 }
1857
1858                 /* Either way, we've made a decision; modulation mode
1859                  * search is done, allow rate adjustment next time. */
1860                 lq_sta->search_better_tbl = 0;
1861                 done_search = 1;        /* Don't switch modes below! */
1862                 goto lq_update;
1863         }
1864
1865         /* (Else) not in search of better modulation mode, try for better
1866          * starting rate, while staying in this mode. */
1867         high_low = rs_get_adjacent_rate(index, rate_scale_index_msk,
1868                                         tbl->lq_type);
1869         low = high_low & 0xff;
1870         high = (high_low >> 8) & 0xff;
1871
1872         /* Collect measured throughputs for current and adjacent rates */
1873         current_tpt = window->average_tpt;
1874         if (low != IWL_RATE_INVALID)
1875                 low_tpt = tbl->win[low].average_tpt;
1876         if (high != IWL_RATE_INVALID)
1877                 high_tpt = tbl->win[high].average_tpt;
1878
1879         /* Assume rate increase */
1880         scale_action = 1;
1881
1882         /* Too many failures, decrease rate */
1883         if ((window->success_ratio <= IWL_RATE_DECREASE_TH) ||
1884             (current_tpt == 0)) {
1885                 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1886                 scale_action = -1;
1887
1888         /* No throughput measured yet for adjacent rates; try increase. */
1889         } else if ((low_tpt == IWL_INVALID_VALUE) &&
1890                    (high_tpt == IWL_INVALID_VALUE))
1891                 scale_action = 1;
1892
1893         /* Both adjacent throughputs are measured, but neither one has better
1894          * throughput; we're using the best rate, don't change it! */
1895         else if ((low_tpt != IWL_INVALID_VALUE) &&
1896                  (high_tpt != IWL_INVALID_VALUE) &&
1897                  (low_tpt < current_tpt) &&
1898                  (high_tpt < current_tpt))
1899                 scale_action = 0;
1900
1901         /* At least one adjacent rate's throughput is measured,
1902          * and may have better performance. */
1903         else {
1904                 /* Higher adjacent rate's throughput is measured */
1905                 if (high_tpt != IWL_INVALID_VALUE) {
1906                         /* Higher rate has better throughput */
1907                         if (high_tpt > current_tpt)
1908                                 scale_action = 1;
1909                         else {
1910                                 IWL_DEBUG_RATE
1911                                     ("decrease rate because of high tpt\n");
1912                                 scale_action = -1;
1913                         }
1914
1915                 /* Lower adjacent rate's throughput is measured */
1916                 } else if (low_tpt != IWL_INVALID_VALUE) {
1917                         /* Lower rate has better throughput */
1918                         if (low_tpt > current_tpt) {
1919                                 IWL_DEBUG_RATE
1920                                     ("decrease rate because of low tpt\n");
1921                                 scale_action = -1;
1922                         } else
1923                                 scale_action = 1;
1924                 }
1925         }
1926
1927         /* Sanity check; asked for decrease, but success rate or throughput
1928          * has been good at old rate.  Don't change it. */
1929         if (scale_action == -1) {
1930                 if ((low != IWL_RATE_INVALID) &&
1931                     ((window->success_ratio > IWL_RATE_HIGH_TH) ||
1932                      (current_tpt > (100 * tbl->expected_tpt[low]))))
1933                         scale_action = 0;
1934
1935         /* Sanity check; asked for increase, but success rate has not been great
1936          * even at old rate, higher rate will be worse.  Don't change it. */
1937         } else if ((scale_action == 1) &&
1938                    (window->success_ratio < IWL_RATE_INCREASE_TH))
1939                 scale_action = 0;
1940
1941         switch (scale_action) {
1942         case -1:
1943                 /* Decrease starting rate, update uCode's rate table */
1944                 if (low != IWL_RATE_INVALID) {
1945                         update_lq = 1;
1946                         index = low;
1947                 }
1948                 break;
1949         case 1:
1950                 /* Increase starting rate, update uCode's rate table */
1951                 if (high != IWL_RATE_INVALID) {
1952                         update_lq = 1;
1953                         index = high;
1954                 }
1955
1956                 break;
1957         case 0:
1958                 /* No change */
1959         default:
1960                 break;
1961         }
1962
1963         IWL_DEBUG_HT("choose rate scale index %d action %d low %d "
1964                     "high %d type %d\n",
1965                      index, scale_action, low, high, tbl->lq_type);
1966
1967  lq_update:
1968         /* Replace uCode's rate table for the destination station. */
1969         if (update_lq) {
1970                 rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green);
1971                 rs_fill_link_cmd(priv, lq_sta, &mcs_rate, &lq_sta->lq);
1972                 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1973         }
1974
1975         /* Should we stay with this modulation mode, or search for a new one? */
1976         rs_stay_in_table(lq_sta);
1977
1978         /*
1979          * Search for new modulation mode if we're:
1980          * 1)  Not changing rates right now
1981          * 2)  Not just finishing up a search
1982          * 3)  Allowing a new search
1983          */
1984         if (!update_lq && !done_search && !lq_sta->stay_in_tbl) {
1985                 /* Save current throughput to compare with "search" throughput*/
1986                 lq_sta->last_tpt = current_tpt;
1987
1988                 /* Select a new "search" modulation mode to try.
1989                  * If one is found, set up the new "search" table. */
1990                 if (is_legacy(tbl->lq_type))
1991                         rs_move_legacy_other(priv, lq_sta, conf, sta, index);
1992                 else if (is_siso(tbl->lq_type))
1993                         rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
1994                 else
1995                         rs_move_mimo_to_other(priv, lq_sta, conf, sta, index);
1996
1997                 /* If new "search" mode was selected, set up in uCode table */
1998                 if (lq_sta->search_better_tbl) {
1999                         /* Access the "search" table, clear its history. */
2000                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2001                         for (i = 0; i < IWL_RATE_COUNT; i++)
2002                                 rs_rate_scale_clear_window(&(tbl->win[i]));
2003
2004                         /* Use new "search" start rate */
2005                         index = iwl4965_hwrate_to_plcp_idx(
2006                                         tbl->current_rate.rate_n_flags);
2007
2008                         IWL_DEBUG_HT("Switch current  mcs: %X index: %d\n",
2009                                      tbl->current_rate.rate_n_flags, index);
2010                         rs_fill_link_cmd(priv, lq_sta, &tbl->current_rate,
2011                                          &lq_sta->lq);
2012                         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2013                 }
2014
2015                 /* If the "active" (non-search) mode was legacy,
2016                  * and we've tried switching antennas,
2017                  * but we haven't been able to try HT modes (not available),
2018                  * stay with best antenna legacy modulation for a while
2019                  * before next round of mode comparisons. */
2020                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2021                 if (is_legacy(tbl1->lq_type) &&
2022 #ifdef CONFIG_IWL4965_HT
2023                    (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)) &&
2024 #endif
2025                     (lq_sta->action_counter >= 1)) {
2026                         lq_sta->action_counter = 0;
2027                         IWL_DEBUG_HT("LQ: STAY in legacy table\n");
2028                         rs_set_stay_in_table(1, lq_sta);
2029                 }
2030
2031                 /* If we're in an HT mode, and all 3 mode switch actions
2032                  * have been tried and compared, stay in this best modulation
2033                  * mode for a while before next round of mode comparisons. */
2034                 if (lq_sta->enable_counter &&
2035                     (lq_sta->action_counter >= IWL_ACTION_LIMIT)) {
2036 #ifdef CONFIG_IWL4965_HT
2037                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2038                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2039                             (tid != MAX_TID_COUNT)) {
2040                                 IWL_DEBUG_HT("try to aggregate tid %d\n", tid);
2041                                 rs_tl_turn_on_agg(priv, tid, lq_sta, sta);
2042                         }
2043 #endif /*CONFIG_IWL4965_HT */
2044                         lq_sta->action_counter = 0;
2045                         rs_set_stay_in_table(0, lq_sta);
2046                 }
2047
2048         /*
2049          * Else, don't search for a new modulation mode.
2050          * Put new timestamp in stay-in-modulation-mode flush timer if:
2051          * 1)  Not changing rates right now
2052          * 2)  Not just finishing up a search
2053          * 3)  flush timer is empty
2054          */
2055         } else {
2056                 if ((!update_lq) && (!done_search) && (!lq_sta->flush_timer))
2057                         lq_sta->flush_timer = jiffies;
2058         }
2059
2060 out:
2061         rs_mcs_from_tbl(&tbl->current_rate, tbl, index, is_green);
2062         i = index;
2063         sta->last_txrate_idx = i;
2064
2065         /* sta->txrate_idx is an index to A mode rates which start
2066          * at IWL_FIRST_OFDM_RATE
2067          */
2068         if (lq_sta->band == IEEE80211_BAND_5GHZ)
2069                 sta->txrate_idx = i - IWL_FIRST_OFDM_RATE;
2070         else
2071                 sta->txrate_idx = i;
2072
2073         return;
2074 }
2075
2076
2077 static void rs_initialize_lq(struct iwl_priv *priv,
2078                              struct ieee80211_conf *conf,
2079                              struct sta_info *sta)
2080 {
2081         int i;
2082         struct iwl4965_lq_sta *lq_sta;
2083         struct iwl4965_scale_tbl_info *tbl;
2084         u8 active_tbl = 0;
2085         int rate_idx;
2086         u8 use_green = rs_use_green(priv, conf);
2087         struct iwl4965_rate mcs_rate;
2088
2089         if (!sta || !sta->rate_ctrl_priv)
2090                 goto out;
2091
2092         lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
2093         i = sta->last_txrate_idx;
2094
2095         if ((lq_sta->lq.sta_id == 0xff) &&
2096             (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
2097                 goto out;
2098
2099         if (!lq_sta->search_better_tbl)
2100                 active_tbl = lq_sta->active_tbl;
2101         else
2102                 active_tbl = 1 - lq_sta->active_tbl;
2103
2104         tbl = &(lq_sta->lq_info[active_tbl]);
2105
2106         if ((i < 0) || (i >= IWL_RATE_COUNT))
2107                 i = 0;
2108
2109         /* FIXME:RS: This is also wrong in 4965 */
2110         mcs_rate.rate_n_flags = iwl4965_rates[i].plcp ;
2111         mcs_rate.rate_n_flags |= RATE_MCS_ANT_B_MSK;
2112         mcs_rate.rate_n_flags &= ~RATE_MCS_ANT_A_MSK;
2113
2114         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2115                 mcs_rate.rate_n_flags |= RATE_MCS_CCK_MSK;
2116
2117         tbl->ant_type = ANT_B;
2118         rs_get_tbl_info_from_mcs(&mcs_rate, priv->band, tbl, &rate_idx);
2119         if (!rs_is_ant_connected(priv->hw_params.valid_tx_ant, tbl->ant_type))
2120             rs_toggle_antenna(&mcs_rate, tbl);
2121
2122         rs_mcs_from_tbl(&mcs_rate, tbl, rate_idx, use_green);
2123         tbl->current_rate.rate_n_flags = mcs_rate.rate_n_flags;
2124         rs_get_expected_tpt_table(lq_sta, tbl);
2125         rs_fill_link_cmd(NULL, lq_sta, &mcs_rate, &lq_sta->lq);
2126         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2127  out:
2128         return;
2129 }
2130
2131 static void rs_get_rate(void *priv_rate, struct net_device *dev,
2132                         struct ieee80211_supported_band *sband,
2133                         struct sk_buff *skb,
2134                         struct rate_selection *sel)
2135 {
2136
2137         int i;
2138         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2139         struct ieee80211_conf *conf = &local->hw.conf;
2140         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2141         struct sta_info *sta;
2142         u16 fc;
2143         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
2144         struct iwl4965_lq_sta *lq_sta;
2145
2146         IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2147
2148         rcu_read_lock();
2149
2150         sta = sta_info_get(local, hdr->addr1);
2151
2152         /* Send management frames and broadcast/multicast data using lowest
2153          * rate. */
2154         fc = le16_to_cpu(hdr->frame_control);
2155         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1) ||
2156             !sta || !sta->rate_ctrl_priv) {
2157                 sel->rate = rate_lowest(local, sband, sta);
2158                 goto out;
2159         }
2160
2161         lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
2162         i = sta->last_txrate_idx;
2163
2164         if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
2165             !lq_sta->ibss_sta_added) {
2166                 u8 sta_id = iwl_find_station(priv, hdr->addr1);
2167                 DECLARE_MAC_BUF(mac);
2168
2169                 if (sta_id == IWL_INVALID_STATION) {
2170                         IWL_DEBUG_RATE("LQ: ADD station %s\n",
2171                                        print_mac(mac, hdr->addr1));
2172                         sta_id = iwl4965_add_station_flags(priv, hdr->addr1,
2173                                                         0, CMD_ASYNC, NULL);
2174                 }
2175                 if ((sta_id != IWL_INVALID_STATION)) {
2176                         lq_sta->lq.sta_id = sta_id;
2177                         lq_sta->lq.rs_table[0].rate_n_flags = 0;
2178                         lq_sta->ibss_sta_added = 1;
2179                         rs_initialize_lq(priv, conf, sta);
2180                 }
2181                 if (!lq_sta->ibss_sta_added)
2182                         goto done;
2183         }
2184
2185 done:
2186         if ((i < 0) || (i > IWL_RATE_COUNT)) {
2187                 sel->rate = rate_lowest(local, sband, sta);
2188                 goto out;
2189         }
2190
2191         sel->rate = &priv->ieee_rates[i];
2192 out:
2193         rcu_read_unlock();
2194 }
2195
2196 static void *rs_alloc_sta(void *priv, gfp_t gfp)
2197 {
2198         struct iwl4965_lq_sta *lq_sta;
2199         int i, j;
2200
2201         IWL_DEBUG_RATE("create station rate scale window\n");
2202
2203         lq_sta = kzalloc(sizeof(struct iwl4965_lq_sta), gfp);
2204
2205         if (lq_sta == NULL)
2206                 return NULL;
2207         lq_sta->lq.sta_id = 0xff;
2208
2209
2210         for (j = 0; j < LQ_SIZE; j++)
2211                 for (i = 0; i < IWL_RATE_COUNT; i++)
2212                         rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
2213
2214         return lq_sta;
2215 }
2216
2217 static void rs_rate_init(void *priv_rate, void *priv_sta,
2218                          struct ieee80211_local *local,
2219                          struct sta_info *sta)
2220 {
2221         int i, j;
2222         struct ieee80211_conf *conf = &local->hw.conf;
2223         struct ieee80211_supported_band *sband;
2224         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
2225         struct iwl4965_lq_sta *lq_sta = priv_sta;
2226
2227         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2228
2229         lq_sta->flush_timer = 0;
2230         lq_sta->supp_rates = sta->supp_rates[sband->band];
2231         sta->txrate_idx = 3;
2232         for (j = 0; j < LQ_SIZE; j++)
2233                 for (i = 0; i < IWL_RATE_COUNT; i++)
2234                         rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
2235
2236         IWL_DEBUG_RATE("rate scale global init\n");
2237         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2238          * the lowest or the highest rate.. Could consider using RSSI from
2239          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2240          * after assoc.. */
2241
2242         lq_sta->ibss_sta_added = 0;
2243         if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
2244                 u8 sta_id = iwl_find_station(priv, sta->addr);
2245                 DECLARE_MAC_BUF(mac);
2246
2247                 /* for IBSS the call are from tasklet */
2248                 IWL_DEBUG_HT("LQ: ADD station %s\n",
2249                              print_mac(mac, sta->addr));
2250
2251                 if (sta_id == IWL_INVALID_STATION) {
2252                         IWL_DEBUG_RATE("LQ: ADD station %s\n",
2253                                        print_mac(mac, sta->addr));
2254                         sta_id = iwl4965_add_station_flags(priv, sta->addr,
2255                                                         0, CMD_ASYNC, NULL);
2256                 }
2257                 if ((sta_id != IWL_INVALID_STATION)) {
2258                         lq_sta->lq.sta_id = sta_id;
2259                         lq_sta->lq.rs_table[0].rate_n_flags = 0;
2260                 }
2261                 /* FIXME: this is w/a remove it later */
2262                 priv->assoc_station_added = 1;
2263         }
2264
2265         /* Find highest tx rate supported by hardware and destination station */
2266         for (i = 0; i < sband->n_bitrates; i++)
2267                 if (sta->supp_rates[sband->band] & BIT(i))
2268                         sta->txrate_idx = i;
2269
2270         sta->last_txrate_idx = sta->txrate_idx;
2271         /* WTF is with this bogus comment? A doesn't have cck rates */
2272         /* For MODE_IEEE80211A, cck rates are at end of rate table */
2273         if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
2274                 sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2275
2276         lq_sta->is_dup = 0;
2277         lq_sta->is_green = rs_use_green(priv, conf);
2278         lq_sta->active_rate = priv->active_rate;
2279         lq_sta->active_rate &= ~(0x1000);
2280         lq_sta->active_rate_basic = priv->active_rate_basic;
2281         lq_sta->band = priv->band;
2282 #ifdef CONFIG_IWL4965_HT
2283         /*
2284          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2285          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2286          */
2287         lq_sta->active_siso_rate =
2288                 priv->current_ht_config.supp_mcs_set[0] << 1;
2289         lq_sta->active_siso_rate |=
2290                 priv->current_ht_config.supp_mcs_set[0] & 0x1;
2291         lq_sta->active_siso_rate &= ~((u16)0x2);
2292         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2293
2294         /* Same here */
2295         lq_sta->active_mimo2_rate =
2296                 priv->current_ht_config.supp_mcs_set[1] << 1;
2297         lq_sta->active_mimo2_rate |=
2298                 priv->current_ht_config.supp_mcs_set[1] & 0x1;
2299         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2300         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2301
2302         lq_sta->active_mimo3_rate =
2303                 priv->current_ht_config.supp_mcs_set[2] << 1;
2304         lq_sta->active_mimo3_rate |=
2305                 priv->current_ht_config.supp_mcs_set[2] & 0x1;
2306         lq_sta->active_mimo3_rate &= ~((u16)0x2);
2307         lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2308
2309         IWL_DEBUG_HT("SISO RATE %X MIMO2 RATE %X MIMO3 RATE %X\n",
2310                      lq_sta->active_siso_rate,
2311                      lq_sta->active_mimo2_rate,
2312                      lq_sta->active_mimo3_rate);
2313
2314         /* as default allow aggregation for all tids */
2315         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2316 #endif /*CONFIG_IWL4965_HT*/
2317 #ifdef CONFIG_MAC80211_DEBUGFS
2318         lq_sta->drv = priv;
2319 #endif
2320
2321         if (priv->assoc_station_added)
2322                 priv->lq_mngr.lq_ready = 1;
2323
2324         rs_initialize_lq(priv, conf, sta);
2325 }
2326
2327 static void rs_fill_link_cmd(const struct iwl_priv *priv,
2328                              struct iwl4965_lq_sta *lq_sta,
2329                              struct iwl4965_rate *tx_mcs,
2330                              struct iwl_link_quality_cmd *lq_cmd)
2331 {
2332         int index = 0;
2333         int rate_idx;
2334         int repeat_rate = 0;
2335         u8 ant_toggle_count = 0;
2336         u8 use_ht_possible = 1;
2337         struct iwl4965_rate new_rate;
2338         struct iwl4965_scale_tbl_info tbl_type = { 0 };
2339
2340         /* Override starting rate (index 0) if needed for debug purposes */
2341         rs_dbgfs_set_mcs(lq_sta, tx_mcs, index);
2342
2343         /* Interpret rate_n_flags */
2344         rs_get_tbl_info_from_mcs(tx_mcs, lq_sta->band,
2345                                   &tbl_type, &rate_idx);
2346
2347         /* How many times should we repeat the initial rate? */
2348         if (is_legacy(tbl_type.lq_type)) {
2349                 ant_toggle_count = 1;
2350                 repeat_rate = IWL_NUMBER_TRY;
2351         } else
2352                 repeat_rate = IWL_HT_NUMBER_TRY;
2353
2354         lq_cmd->general_params.mimo_delimiter =
2355                         is_mimo(tbl_type.lq_type) ? 1 : 0;
2356
2357         /* Fill 1st table entry (index 0) */
2358         lq_cmd->rs_table[index].rate_n_flags =
2359                         cpu_to_le32(tx_mcs->rate_n_flags);
2360         new_rate.rate_n_flags = tx_mcs->rate_n_flags;
2361
2362         /*FIXME:RS*/
2363         if (is_mimo(tbl_type.lq_type) || (tbl_type.ant_type == ANT_A))
2364                 lq_cmd->general_params.single_stream_ant_msk
2365                         = LINK_QUAL_ANT_A_MSK;
2366         else
2367                 lq_cmd->general_params.single_stream_ant_msk
2368                         = LINK_QUAL_ANT_B_MSK;
2369
2370         index++;
2371         repeat_rate--;
2372
2373         /* Fill rest of rate table */
2374         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2375                 /* Repeat initial/next rate.
2376                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2377                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2378                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2379                         if (is_legacy(tbl_type.lq_type)) {
2380                                 if (ant_toggle_count <
2381                                     NUM_TRY_BEFORE_ANTENNA_TOGGLE)
2382                                         ant_toggle_count++;
2383                                 else if (priv && rs_is_other_ant_connected(
2384                                                 priv->hw_params.valid_tx_ant,
2385                                                 tbl_type.ant_type)) {
2386                                         rs_toggle_antenna(&new_rate, &tbl_type);
2387                                         ant_toggle_count = 1;
2388                                 }
2389                         }
2390
2391                         /* Override next rate if needed for debug purposes */
2392                         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2393
2394                         /* Fill next table entry */
2395                         lq_cmd->rs_table[index].rate_n_flags =
2396                                         cpu_to_le32(new_rate.rate_n_flags);
2397                         repeat_rate--;
2398                         index++;
2399                 }
2400
2401                 rs_get_tbl_info_from_mcs(&new_rate, lq_sta->band, &tbl_type,
2402                                                 &rate_idx);
2403
2404                 /* Indicate to uCode which entries might be MIMO.
2405                  * If initial rate was MIMO, this will finally end up
2406                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2407                 if (is_mimo(tbl_type.lq_type))
2408                         lq_cmd->general_params.mimo_delimiter = index;
2409
2410                 /* Get next rate */
2411                 rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2412                                   use_ht_possible, &new_rate);
2413
2414                 /* How many times should we repeat the next rate? */
2415                 if (is_legacy(tbl_type.lq_type)) {
2416                         if (ant_toggle_count < NUM_TRY_BEFORE_ANTENNA_TOGGLE)
2417                                 ant_toggle_count++;
2418                         else if (priv && rs_is_other_ant_connected(
2419                                                 priv->hw_params.valid_tx_ant,
2420                                                 tbl_type.ant_type)) {
2421                                 rs_toggle_antenna(&new_rate, &tbl_type);
2422                                 ant_toggle_count = 1;
2423                         }
2424                         repeat_rate = IWL_NUMBER_TRY;
2425                 } else
2426                         repeat_rate = IWL_HT_NUMBER_TRY;
2427
2428                 /* Don't allow HT rates after next pass.
2429                  * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2430                 use_ht_possible = 0;
2431
2432                 /* Override next rate if needed for debug purposes */
2433                 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2434
2435                 /* Fill next table entry */
2436                 lq_cmd->rs_table[index].rate_n_flags =
2437                                 cpu_to_le32(new_rate.rate_n_flags);
2438
2439                 index++;
2440                 repeat_rate--;
2441         }
2442
2443         lq_cmd->general_params.dual_stream_ant_msk = 3;
2444         lq_cmd->agg_params.agg_dis_start_th = 3;
2445         lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
2446 }
2447
2448 static void *rs_alloc(struct ieee80211_local *local)
2449 {
2450         return local->hw.priv;
2451 }
2452 /* rate scale requires free function to be implemented */
2453 static void rs_free(void *priv_rate)
2454 {
2455         return;
2456 }
2457
2458 static void rs_clear(void *priv_rate)
2459 {
2460         struct iwl_priv *priv = (struct iwl_priv *) priv_rate;
2461
2462         IWL_DEBUG_RATE("enter\n");
2463
2464         priv->lq_mngr.lq_ready = 0;
2465
2466         IWL_DEBUG_RATE("leave\n");
2467 }
2468
2469 static void rs_free_sta(void *priv, void *priv_sta)
2470 {
2471         struct iwl4965_lq_sta *lq_sta = priv_sta;
2472
2473         IWL_DEBUG_RATE("enter\n");
2474         kfree(lq_sta);
2475         IWL_DEBUG_RATE("leave\n");
2476 }
2477
2478
2479 #ifdef CONFIG_MAC80211_DEBUGFS
2480 static int open_file_generic(struct inode *inode, struct file *file)
2481 {
2482         file->private_data = inode->i_private;
2483         return 0;
2484 }
2485 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
2486                                 struct iwl4965_rate *mcs, int index)
2487 {
2488         u32 base_rate;
2489
2490         if (lq_sta->band == IEEE80211_BAND_5GHZ)
2491                 base_rate = 0x800D;
2492         else
2493                 base_rate = 0x820A;
2494
2495         if (lq_sta->dbg_fixed.rate_n_flags) {
2496                 if (index < 12)
2497                         mcs->rate_n_flags = lq_sta->dbg_fixed.rate_n_flags;
2498                 else
2499                         mcs->rate_n_flags = base_rate;
2500                 IWL_DEBUG_RATE("Fixed rate ON\n");
2501                 return;
2502         }
2503
2504         IWL_DEBUG_RATE("Fixed rate OFF\n");
2505 }
2506
2507 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2508                         const char __user *user_buf, size_t count, loff_t *ppos)
2509 {
2510         struct iwl4965_lq_sta *lq_sta = file->private_data;
2511         char buf[64];
2512         int buf_size;
2513         u32 parsed_rate;
2514
2515         memset(buf, 0, sizeof(buf));
2516         buf_size = min(count, sizeof(buf) -  1);
2517         if (copy_from_user(buf, user_buf, buf_size))
2518                 return -EFAULT;
2519
2520         if (sscanf(buf, "%x", &parsed_rate) == 1)
2521                 lq_sta->dbg_fixed.rate_n_flags = parsed_rate;
2522         else
2523                 lq_sta->dbg_fixed.rate_n_flags = 0;
2524
2525         lq_sta->active_rate = 0x0FFF;   /* 1 - 54 MBits, includes CCK */
2526         lq_sta->active_siso_rate = 0x1FD0;      /* 6 - 60 MBits, no 9, no CCK */
2527         lq_sta->active_mimo2_rate = 0x1FD0;     /* 6 - 60 MBits, no 9, no CCK */
2528         lq_sta->active_mimo3_rate = 0x1FD0;     /* 6 - 60 MBits, no 9, no CCK */
2529
2530         IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2531                 lq_sta->lq.sta_id, lq_sta->dbg_fixed.rate_n_flags);
2532
2533         if (lq_sta->dbg_fixed.rate_n_flags) {
2534                 rs_fill_link_cmd(NULL, lq_sta, &lq_sta->dbg_fixed, &lq_sta->lq);
2535                 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2536         }
2537
2538         return count;
2539 }
2540
2541 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2542                         char __user *user_buf, size_t count, loff_t *ppos)
2543 {
2544         char buff[1024];
2545         int desc = 0;
2546         int i = 0;
2547
2548         struct iwl4965_lq_sta *lq_sta = file->private_data;
2549
2550         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2551         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2552                         lq_sta->total_failed, lq_sta->total_success,
2553                         lq_sta->active_rate);
2554         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2555                         lq_sta->dbg_fixed.rate_n_flags);
2556         desc += sprintf(buff+desc, "general:"
2557                 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2558                 lq_sta->lq.general_params.flags,
2559                 lq_sta->lq.general_params.mimo_delimiter,
2560                 lq_sta->lq.general_params.single_stream_ant_msk,
2561                 lq_sta->lq.general_params.dual_stream_ant_msk);
2562
2563         desc += sprintf(buff+desc, "agg:"
2564                         "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2565                         le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2566                         lq_sta->lq.agg_params.agg_dis_start_th,
2567                         lq_sta->lq.agg_params.agg_frame_cnt_limit);
2568
2569         desc += sprintf(buff+desc,
2570                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2571                         lq_sta->lq.general_params.start_rate_index[0],
2572                         lq_sta->lq.general_params.start_rate_index[1],
2573                         lq_sta->lq.general_params.start_rate_index[2],
2574                         lq_sta->lq.general_params.start_rate_index[3]);
2575
2576
2577         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2578                 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
2579                         i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2580
2581         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2582 }
2583
2584 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2585         .write = rs_sta_dbgfs_scale_table_write,
2586         .read = rs_sta_dbgfs_scale_table_read,
2587         .open = open_file_generic,
2588 };
2589 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2590                         char __user *user_buf, size_t count, loff_t *ppos)
2591 {
2592         char buff[1024];
2593         int desc = 0;
2594         int i, j;
2595
2596         struct iwl4965_lq_sta *lq_sta = file->private_data;
2597         for (i = 0; i < LQ_SIZE; i++) {
2598                 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2599                                 "rate=0x%X\n",
2600                                 lq_sta->active_tbl == i?"*":"x",
2601                                 lq_sta->lq_info[i].lq_type,
2602                                 lq_sta->lq_info[i].is_SGI,
2603                                 lq_sta->lq_info[i].is_fat,
2604                                 lq_sta->lq_info[i].is_dup,
2605                                 lq_sta->lq_info[i].current_rate.rate_n_flags);
2606                 for (j = 0; j < IWL_RATE_COUNT; j++) {
2607                         desc += sprintf(buff+desc,
2608                                 "counter=%d success=%d %%=%d\n",
2609                                 lq_sta->lq_info[i].win[j].counter,
2610                                 lq_sta->lq_info[i].win[j].success_counter,
2611                                 lq_sta->lq_info[i].win[j].success_ratio);
2612                 }
2613         }
2614         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2615 }
2616
2617 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2618         .read = rs_sta_dbgfs_stats_table_read,
2619         .open = open_file_generic,
2620 };
2621
2622 static void rs_add_debugfs(void *priv, void *priv_sta,
2623                                         struct dentry *dir)
2624 {
2625         struct iwl4965_lq_sta *lq_sta = priv_sta;
2626         lq_sta->rs_sta_dbgfs_scale_table_file =
2627                 debugfs_create_file("rate_scale_table", 0600, dir,
2628                                 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2629         lq_sta->rs_sta_dbgfs_stats_table_file =
2630                 debugfs_create_file("rate_stats_table", 0600, dir,
2631                         lq_sta, &rs_sta_dbgfs_stats_table_ops);
2632 #ifdef CONFIG_IWL4965_HT
2633         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2634                 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
2635                 &lq_sta->tx_agg_tid_en);
2636 #endif
2637
2638 }
2639
2640 static void rs_remove_debugfs(void *priv, void *priv_sta)
2641 {
2642         struct iwl4965_lq_sta *lq_sta = priv_sta;
2643         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2644         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2645 #ifdef CONFIG_IWL4965_HT
2646         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2647 #endif
2648 }
2649 #endif
2650
2651 static struct rate_control_ops rs_ops = {
2652         .module = NULL,
2653         .name = RS_NAME,
2654         .tx_status = rs_tx_status,
2655         .get_rate = rs_get_rate,
2656         .rate_init = rs_rate_init,
2657         .clear = rs_clear,
2658         .alloc = rs_alloc,
2659         .free = rs_free,
2660         .alloc_sta = rs_alloc_sta,
2661         .free_sta = rs_free_sta,
2662 #ifdef CONFIG_MAC80211_DEBUGFS
2663         .add_sta_debugfs = rs_add_debugfs,
2664         .remove_sta_debugfs = rs_remove_debugfs,
2665 #endif
2666 };
2667
2668 int iwl4965_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id)
2669 {
2670         struct ieee80211_local *local = hw_to_local(hw);
2671         struct iwl_priv *priv = hw->priv;
2672         struct iwl4965_lq_sta *lq_sta;
2673         struct sta_info *sta;
2674         int cnt = 0, i;
2675         u32 samples = 0, success = 0, good = 0;
2676         unsigned long now = jiffies;
2677         u32 max_time = 0;
2678         u8 lq_type, antenna;
2679
2680         rcu_read_lock();
2681
2682         sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
2683         if (!sta || !sta->rate_ctrl_priv) {
2684                 if (sta)
2685                         IWL_DEBUG_RATE("leave - no private rate data!\n");
2686                 else
2687                         IWL_DEBUG_RATE("leave - no station!\n");
2688                 rcu_read_unlock();
2689                 return sprintf(buf, "station %d not found\n", sta_id);
2690         }
2691
2692         lq_sta = (void *)sta->rate_ctrl_priv;
2693
2694         lq_type = lq_sta->lq_info[lq_sta->active_tbl].lq_type;
2695         antenna = lq_sta->lq_info[lq_sta->active_tbl].ant_type;
2696
2697         if (is_legacy(lq_type))
2698                 i = IWL_RATE_54M_INDEX;
2699         else
2700                 i = IWL_RATE_60M_INDEX;
2701         while (1) {
2702                 u64 mask;
2703                 int j;
2704                 int active = lq_sta->active_tbl;
2705
2706                 cnt +=
2707                     sprintf(&buf[cnt], " %2dMbs: ", iwl4965_rates[i].ieee / 2);
2708
2709                 mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1));
2710                 for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1)
2711                         buf[cnt++] =
2712                                 (lq_sta->lq_info[active].win[i].data & mask)
2713                                 ? '1' : '0';
2714
2715                 samples += lq_sta->lq_info[active].win[i].counter;
2716                 good += lq_sta->lq_info[active].win[i].success_counter;
2717                 success += lq_sta->lq_info[active].win[i].success_counter *
2718                            iwl4965_rates[i].ieee;
2719
2720                 if (lq_sta->lq_info[active].win[i].stamp) {
2721                         int delta =
2722                                    jiffies_to_msecs(now -
2723                                    lq_sta->lq_info[active].win[i].stamp);
2724
2725                         if (delta > max_time)
2726                                 max_time = delta;
2727
2728                         cnt += sprintf(&buf[cnt], "%5dms\n", delta);
2729                 } else
2730                         buf[cnt++] = '\n';
2731
2732                 j = iwl4965_get_prev_ieee_rate(i);
2733                 if (j == i)
2734                         break;
2735                 i = j;
2736         }
2737
2738         /* Display the average rate of all samples taken.
2739          *
2740          * NOTE:  We multiply # of samples by 2 since the IEEE measurement
2741          * added from iwl4965_rates is actually 2X the rate */
2742         if (samples)
2743                 cnt += sprintf(&buf[cnt],
2744                          "\nAverage rate is %3d.%02dMbs over last %4dms\n"
2745                          "%3d%% success (%d good packets over %d tries)\n",
2746                          success / (2 * samples), (success * 5 / samples) % 10,
2747                          max_time, good * 100 / samples, good, samples);
2748         else
2749                 cnt += sprintf(&buf[cnt], "\nAverage rate: 0Mbs\n");
2750
2751         cnt += sprintf(&buf[cnt], "\nrate scale type %d antenna %d "
2752                          "active_search %d rate index %d\n", lq_type, antenna,
2753                          lq_sta->search_better_tbl, sta->last_txrate_idx);
2754
2755         rcu_read_unlock();
2756         return cnt;
2757 }
2758
2759 void iwl4965_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
2760 {
2761         struct iwl_priv *priv = hw->priv;
2762
2763         priv->lq_mngr.lq_ready = 1;
2764 }
2765
2766 int iwl4965_rate_control_register(void)
2767 {
2768         return ieee80211_rate_control_register(&rs_ops);
2769 }
2770
2771 void iwl4965_rate_control_unregister(void)
2772 {
2773         ieee80211_rate_control_unregister(&rs_ops);
2774 }
2775