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 #include <net/ieee80211.h>
  32
  33 #include <linux/netdevice.h>
  34 #include <linux/etherdevice.h>
  35 #include <linux/delay.h>
  36
  37 #include <linux/workqueue.h>
  38
  39 #include "../net/mac80211/ieee80211_rate.h"
  40
  41 #include "iwl-4965.h"
  42 #include "iwl-core.h"
  43 #include "iwl-helpers.h"
  44
  45 #define RS_NAME "iwl-4965-rs"
  46
  47 #define NUM_TRY_BEFORE_ANTENNA_TOGGLE 1
  48 #define IWL_NUMBER_TRY      1
  49 #define IWL_HT_NUMBER_TRY   3
  50
  51 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  52 #define IWL_RATE_MIN_FAILURE_TH         6       /* min failures to calc tpt */
  53 #define IWL_RATE_MIN_SUCCESS_TH         8       /* min successes to calc tpt */
  54
  55 /* max time to accum history 2 seconds */
  56 #define IWL_RATE_SCALE_FLUSH_INTVL   (2*HZ)
  57
  58 static u8 rs_ht_to_legacy[] = {
  59         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  60         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  61         IWL_RATE_6M_INDEX,
  62         IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
  63         IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
  64         IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
  65         IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
  66 };
  67
  68 struct iwl4965_rate {
  69         u32 rate_n_flags;
  70 } __attribute__ ((packed));
  71
  72 /**
  73  * struct iwl4965_rate_scale_data -- tx success history for one rate
  74  */
  75 struct iwl4965_rate_scale_data {
  76         u64 data;               /* bitmap of successful frames */
  77         s32 success_counter;    /* number of frames successful */
  78         s32 success_ratio;      /* per-cent * 128  */
  79         s32 counter;            /* number of frames attempted */
  80         s32 average_tpt;        /* success ratio * expected throughput */
  81         unsigned long stamp;
  82 };
  83
  84 /**
  85  * struct iwl4965_scale_tbl_info -- tx params and success history for all rates
  86  *
  87  * There are two of these in struct iwl4965_lq_sta,
  88  * one for "active", and one for "search".
  89  */
  90 struct iwl4965_scale_tbl_info {
  91         enum iwl4965_table_type lq_type;
  92         enum iwl4965_antenna_type antenna_type;
  93         u8 is_SGI;      /* 1 = short guard interval */
  94         u8 is_fat;      /* 1 = 40 MHz channel width */
  95         u8 is_dup;      /* 1 = duplicated data streams */
  96         u8 action;      /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
  97         s32 *expected_tpt;      /* throughput metrics; expected_tpt_G, etc. */
  98         struct iwl4965_rate current_rate;  /* rate_n_flags, uCode API format */
  99         struct iwl4965_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
 100 };
 101
 102 #ifdef CONFIG_IWL4965_HT
 103
 104 struct iwl4965_traffic_load {
 105         unsigned long time_stamp;       /* age of the oldest statistics */
 106         u32 packet_count[TID_QUEUE_MAX_SIZE];   /* packet count in this time
 107                                                  * slice */
 108         u32 total;                      /* total num of packets during the
 109                                          * last TID_MAX_TIME_DIFF */
 110         u8 queue_count;                 /* number of queues that has
 111                                          * been used since the last cleanup */
 112         u8 head;                        /* start of the circular buffer */
 113 };
 114
 115 #endif /* CONFIG_IWL4965_HT */
 116
 117 /**
 118  * struct iwl4965_lq_sta -- driver's rate scaling private structure
 119  *
 120  * Pointer to this gets passed back and forth between driver and mac80211.
 121  */
 122 struct iwl4965_lq_sta {
 123         u8 active_tbl;          /* index of active table, range 0-1 */
 124         u8 enable_counter;      /* indicates HT mode */
 125         u8 stay_in_tbl;         /* 1: disallow, 0: allow search for new mode */
 126         u8 search_better_tbl;   /* 1: currently trying alternate mode */
 127         s32 last_tpt;
 128
 129         /* The following determine when to search for a new mode */
 130         u32 table_count_limit;
 131         u32 max_failure_limit;  /* # failed frames before new search */
 132         u32 max_success_limit;  /* # successful frames before new search */
 133         u32 table_count;
 134         u32 total_failed;       /* total failed frames, any/all rates */
 135         u32 total_success;      /* total successful frames, any/all rates */
 136         u32 flush_timer;        /* time staying in mode before new search */
 137
 138         u8 action_counter;      /* # mode-switch actions tried */
 139         u8 antenna;
 140         u8 valid_antenna;
 141         u8 is_green;
 142         u8 is_dup;
 143         enum ieee80211_band band;
 144         u8 ibss_sta_added;
 145
 146         /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
 147         u32 supp_rates;
 148         u16 active_rate;
 149         u16 active_siso_rate;
 150         u16 active_mimo_rate;
 151         u16 active_rate_basic;
 152
 153         struct iwl4965_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(struct iwl4965_lq_sta *lq_sta,
 175                              struct iwl4965_rate *tx_mcs,
 176                              struct iwl4965_link_quality_cmd *tbl);
 177
 178
 179 #ifdef CONFIG_MAC80211_DEBUGFS
 180 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
 181                                 struct iwl4965_rate *mcs, int index);
 182 #else
 183 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
 184                                 struct iwl4965_rate *mcs, int index)
 185 {}
 186 #endif
 187
 188 /*
 189  * Expected throughput metrics for following rates:
 190  * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 191  * "G" is the only table that supports CCK (the first 4 rates).
 192  */
 193 static s32 expected_tpt_A[IWL_RATE_COUNT] = {
 194         0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
 195 };
 196
 197 static s32 expected_tpt_G[IWL_RATE_COUNT] = {
 198         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
 199 };
 200
 201 static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
 202         0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
 203 };
 204
 205 static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
 206         0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
 207 };
 208
 209 static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
 210         0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
 211 };
 212
 213 static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
 214         0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
 215 };
 216
 217 static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
 218         0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
 219 };
 220
 221 static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
 222         0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
 223 };
 224
 225 static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
 226         0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
 227 };
 228
 229 static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
 230         0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
 231 };
 232
 233 static int iwl4965_lq_sync_callback(struct iwl_priv *priv,
 234                                 struct iwl_cmd *cmd, struct sk_buff *skb)
 235 {
 236         /*We didn't cache the SKB; let the caller free it */
 237         return 1;
 238 }
 239
 240 static inline u8 iwl4965_rate_get_rate(u32 rate_n_flags)
 241 {
 242         return (u8)(rate_n_flags & 0xFF);
 243 }
 244
 245 static int rs_send_lq_cmd(struct iwl_priv *priv,
 246                           struct iwl4965_link_quality_cmd *lq, u8 flags)
 247 {
 248 #ifdef CONFIG_IWLWIFI_DEBUG
 249         int i;
 250 #endif
 251         struct iwl_host_cmd cmd = {
 252                 .id = REPLY_TX_LINK_QUALITY_CMD,
 253                 .len = sizeof(struct iwl4965_link_quality_cmd),
 254                 .meta.flags = flags,
 255                 .data = lq,
 256         };
 257
 258         if ((lq->sta_id == 0xFF) &&
 259             (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
 260                 return -EINVAL;
 261
 262         if (lq->sta_id == 0xFF)
 263                 lq->sta_id = IWL_AP_ID;
 264
 265         IWL_DEBUG_RATE("lq station id 0x%x\n", lq->sta_id);
 266         IWL_DEBUG_RATE("lq dta 0x%X 0x%X\n",
 267                        lq->general_params.single_stream_ant_msk,
 268                        lq->general_params.dual_stream_ant_msk);
 269 #ifdef CONFIG_IWLWIFI_DEBUG
 270         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
 271                 IWL_DEBUG_RATE("lq index %d 0x%X\n",
 272                                 i, lq->rs_table[i].rate_n_flags);
 273 #endif
 274
 275         if (flags & CMD_ASYNC)
 276                 cmd.meta.u.callback = iwl4965_lq_sync_callback;
 277
 278         if (iwl4965_is_associated(priv) && priv->assoc_station_added &&
 279             priv->lq_mngr.lq_ready)
 280                 return  iwl_send_cmd(priv, &cmd);
 281
 282         return 0;
 283 }
 284
 285 static void rs_rate_scale_clear_window(struct iwl4965_rate_scale_data *window)
 286 {
 287         window->data = 0;
 288         window->success_counter = 0;
 289         window->success_ratio = IWL_INVALID_VALUE;
 290         window->counter = 0;
 291         window->average_tpt = IWL_INVALID_VALUE;
 292         window->stamp = 0;
 293 }
 294
 295 #ifdef CONFIG_IWL4965_HT
 296 /*
 297  *      removes the old data from the statistics. All data that is older than
 298  *      TID_MAX_TIME_DIFF, will be deleted.
 299  */
 300 static void rs_tl_rm_old_stats(struct iwl4965_traffic_load *tl, u32 curr_time)
 301 {
 302         /* The oldest age we want to keep */
 303         u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
 304
 305         while (tl->queue_count &&
 306                (tl->time_stamp < oldest_time)) {
 307                 tl->total -= tl->packet_count[tl->head];
 308                 tl->packet_count[tl->head] = 0;
 309                 tl->time_stamp += TID_QUEUE_CELL_SPACING;
 310                 tl->queue_count--;
 311                 tl->head++;
 312                 if (tl->head >= TID_QUEUE_MAX_SIZE)
 313                         tl->head = 0;
 314         }
 315 }
 316
 317 /*
 318  *      increment traffic load value for tid and also remove
 319  *      any old values if passed the certain time period
 320  */
 321 static void rs_tl_add_packet(struct iwl4965_lq_sta *lq_data, u8 tid)
 322 {
 323         u32 curr_time = jiffies_to_msecs(jiffies);
 324         u32 time_diff;
 325         s32 index;
 326         struct iwl4965_traffic_load *tl = NULL;
 327
 328         if (tid >= TID_MAX_LOAD_COUNT)
 329                 return;
 330
 331         tl = &lq_data->load[tid];
 332
 333         curr_time -= curr_time % TID_ROUND_VALUE;
 334
 335         /* Happens only for the first packet. Initialize the data */
 336         if (!(tl->queue_count)) {
 337                 tl->total = 1;
 338                 tl->time_stamp = curr_time;
 339                 tl->queue_count = 1;
 340                 tl->head = 0;
 341                 tl->packet_count[0] = 1;
 342                 return;
 343         }
 344
 345         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 346         index = time_diff / TID_QUEUE_CELL_SPACING;
 347
 348         /* The history is too long: remove data that is older than */
 349         /* TID_MAX_TIME_DIFF */
 350         if (index >= TID_QUEUE_MAX_SIZE)
 351                 rs_tl_rm_old_stats(tl, curr_time);
 352
 353         index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
 354         tl->packet_count[index] = tl->packet_count[index] + 1;
 355         tl->total = tl->total + 1;
 356
 357         if ((index + 1) > tl->queue_count)
 358                 tl->queue_count = index + 1;
 359 }
 360
 361 /*
 362         get the traffic load value for tid
 363 */
 364 static u32 rs_tl_get_load(struct iwl4965_lq_sta *lq_data, u8 tid)
 365 {
 366         u32 curr_time = jiffies_to_msecs(jiffies);
 367         u32 time_diff;
 368         s32 index;
 369         struct iwl4965_traffic_load *tl = NULL;
 370
 371         if (tid >= TID_MAX_LOAD_COUNT)
 372                 return 0;
 373
 374         tl = &(lq_data->load[tid]);
 375
 376         curr_time -= curr_time % TID_ROUND_VALUE;
 377
 378         if (!(tl->queue_count))
 379                 return 0;
 380
 381         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 382         index = time_diff / TID_QUEUE_CELL_SPACING;
 383
 384         /* The history is too long: remove data that is older than */
 385         /* TID_MAX_TIME_DIFF */
 386         if (index >= TID_QUEUE_MAX_SIZE)
 387                 rs_tl_rm_old_stats(tl, curr_time);
 388
 389         return tl->total;
 390 }
 391
 392 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
 393                                 struct iwl4965_lq_sta *lq_data, u8 tid,
 394                                 struct sta_info *sta)
 395 {
 396         unsigned long state;
 397         DECLARE_MAC_BUF(mac);
 398
 399         spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
 400         state = sta->ampdu_mlme.tid_tx[tid].state;
 401         spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
 402
 403         if (state == HT_AGG_STATE_IDLE &&
 404             rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
 405                 IWL_DEBUG_HT("Starting Tx agg: STA: %s tid: %d\n",
 406                                 print_mac(mac, sta->addr), tid);
 407                 ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
 408         }
 409 }
 410
 411 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
 412                                 struct iwl4965_lq_sta *lq_data,
 413                                 struct sta_info *sta)
 414 {
 415         if ((tid < TID_MAX_LOAD_COUNT))
 416                 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 417         else if (tid == IWL_AGG_ALL_TID)
 418                 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
 419                         rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 420 }
 421
 422 #endif /* CONFIG_IWLWIFI_HT */
 423
 424 /**
 425  * rs_collect_tx_data - Update the success/failure sliding window
 426  *
 427  * We keep a sliding window of the last 62 packets transmitted
 428  * at this rate.  window->data contains the bitmask of successful
 429  * packets.
 430  */
 431 static int rs_collect_tx_data(struct iwl4965_rate_scale_data *windows,
 432                               int scale_index, s32 tpt, int retries,
 433                               int successes)
 434 {
 435         struct iwl4965_rate_scale_data *window = NULL;
 436         u64 mask;
 437         u8 win_size = IWL_RATE_MAX_WINDOW;
 438         s32 fail_count;
 439
 440         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 441                 return -EINVAL;
 442
 443         /* Select data for current tx bit rate */
 444         window = &(windows[scale_index]);
 445
 446         /*
 447          * Keep track of only the latest 62 tx frame attempts in this rate's
 448          * history window; anything older isn't really relevant any more.
 449          * If we have filled up the sliding window, drop the oldest attempt;
 450          * if the oldest attempt (highest bit in bitmap) shows "success",
 451          * subtract "1" from the success counter (this is the main reason
 452          * we keep these bitmaps!).
 453          */
 454         while (retries > 0) {
 455                 if (window->counter >= win_size) {
 456                         window->counter = win_size - 1;
 457                         mask = 1;
 458                         mask = (mask << (win_size - 1));
 459                         if (window->data & mask) {
 460                                 window->data &= ~mask;
 461                                 window->success_counter =
 462                                         window->success_counter - 1;
 463                         }
 464                 }
 465
 466                 /* Increment frames-attempted counter */
 467                 window->counter++;
 468
 469                 /* Shift bitmap by one frame (throw away oldest history),
 470                  * OR in "1", and increment "success" if this
 471                  * frame was successful. */
 472                 mask = window->data;
 473                 window->data = (mask << 1);
 474                 if (successes > 0) {
 475                         window->success_counter = window->success_counter + 1;
 476                         window->data |= 0x1;
 477                         successes--;
 478                 }
 479
 480                 retries--;
 481         }
 482
 483         /* Calculate current success ratio, avoid divide-by-0! */
 484         if (window->counter > 0)
 485                 window->success_ratio = 128 * (100 * window->success_counter)
 486                                         / window->counter;
 487         else
 488                 window->success_ratio = IWL_INVALID_VALUE;
 489
 490         fail_count = window->counter - window->success_counter;
 491
 492         /* Calculate average throughput, if we have enough history. */
 493         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 494             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 495                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 496         else
 497                 window->average_tpt = IWL_INVALID_VALUE;
 498
 499         /* Tag this window as having been updated */
 500         window->stamp = jiffies;
 501
 502         return 0;
 503 }
 504
 505 /*
 506  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
 507  */
 508 static void rs_mcs_from_tbl(struct iwl4965_rate *mcs_rate,
 509                            struct iwl4965_scale_tbl_info *tbl,
 510                            int index, u8 use_green)
 511 {
 512         if (is_legacy(tbl->lq_type)) {
 513                 mcs_rate->rate_n_flags = iwl4965_rates[index].plcp;
 514                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 515                         mcs_rate->rate_n_flags |= RATE_MCS_CCK_MSK;
 516
 517         } else if (is_siso(tbl->lq_type)) {
 518                 if (index > IWL_LAST_OFDM_RATE)
 519                         index = IWL_LAST_OFDM_RATE;
 520                  mcs_rate->rate_n_flags = iwl4965_rates[index].plcp_siso |
 521                                           RATE_MCS_HT_MSK;
 522         } else {
 523                 if (index > IWL_LAST_OFDM_RATE)
 524                         index = IWL_LAST_OFDM_RATE;
 525                 mcs_rate->rate_n_flags = iwl4965_rates[index].plcp_mimo |
 526                                          RATE_MCS_HT_MSK;
 527         }
 528
 529         switch (tbl->antenna_type) {
 530         case ANT_BOTH:
 531                 mcs_rate->rate_n_flags |= RATE_MCS_ANT_AB_MSK;
 532                 break;
 533         case ANT_MAIN:
 534                 mcs_rate->rate_n_flags |= RATE_MCS_ANT_A_MSK;
 535                 break;
 536         case ANT_AUX:
 537                 mcs_rate->rate_n_flags |= RATE_MCS_ANT_B_MSK;
 538                 break;
 539         case ANT_NONE:
 540                 break;
 541         }
 542
 543         if (is_legacy(tbl->lq_type))
 544                 return;
 545
 546         if (tbl->is_fat) {
 547                 if (tbl->is_dup)
 548                         mcs_rate->rate_n_flags |= RATE_MCS_DUP_MSK;
 549                 else
 550                         mcs_rate->rate_n_flags |= RATE_MCS_FAT_MSK;
 551         }
 552         if (tbl->is_SGI)
 553                 mcs_rate->rate_n_flags |= RATE_MCS_SGI_MSK;
 554
 555         if (use_green) {
 556                 mcs_rate->rate_n_flags |= RATE_MCS_GF_MSK;
 557                 if (is_siso(tbl->lq_type))
 558                         mcs_rate->rate_n_flags &= ~RATE_MCS_SGI_MSK;
 559         }
 560 }
 561
 562 /*
 563  * Interpret uCode API's rate_n_flags format,
 564  * fill "search" or "active" tx mode table.
 565  */
 566 static int rs_get_tbl_info_from_mcs(const struct iwl4965_rate *mcs_rate,
 567                                     enum ieee80211_band band,
 568                                     struct iwl4965_scale_tbl_info *tbl,
 569                                     int *rate_idx)
 570 {
 571         int index;
 572         u32 ant_msk;
 573
 574         index = iwl4965_hwrate_to_plcp_idx(mcs_rate->rate_n_flags);
 575
 576         if (index  == IWL_RATE_INVALID) {
 577                 *rate_idx = -1;
 578                 return -EINVAL;
 579         }
 580         tbl->is_SGI = 0;        /* default legacy setup */
 581         tbl->is_fat = 0;
 582         tbl->is_dup = 0;
 583         tbl->antenna_type = ANT_BOTH;   /* default MIMO setup */
 584
 585         /* legacy rate format */
 586         if (!(mcs_rate->rate_n_flags & RATE_MCS_HT_MSK)) {
 587                 ant_msk = (mcs_rate->rate_n_flags & RATE_MCS_ANT_AB_MSK);
 588
 589                 if (ant_msk == RATE_MCS_ANT_AB_MSK)
 590                         tbl->lq_type = LQ_NONE;
 591                 else {
 592
 593                         if (band == IEEE80211_BAND_5GHZ)
 594                                 tbl->lq_type = LQ_A;
 595                         else
 596                                 tbl->lq_type = LQ_G;
 597
 598                         if (mcs_rate->rate_n_flags & RATE_MCS_ANT_A_MSK)
 599                                 tbl->antenna_type = ANT_MAIN;
 600                         else
 601                                 tbl->antenna_type = ANT_AUX;
 602                 }
 603                 *rate_idx = index;
 604
 605         /* HT rate format, SISO (might be 20 MHz legacy or 40 MHz fat width) */
 606         } else if (iwl4965_rate_get_rate(mcs_rate->rate_n_flags)
 607                                         <= IWL_RATE_SISO_60M_PLCP) {
 608                 tbl->lq_type = LQ_SISO;
 609
 610                 ant_msk = (mcs_rate->rate_n_flags & RATE_MCS_ANT_AB_MSK);
 611                 if (ant_msk == RATE_MCS_ANT_AB_MSK)
 612                         tbl->lq_type = LQ_NONE;
 613                 else {
 614                         if (mcs_rate->rate_n_flags & RATE_MCS_ANT_A_MSK)
 615                                 tbl->antenna_type = ANT_MAIN;
 616                         else
 617                                 tbl->antenna_type = ANT_AUX;
 618                 }
 619                 if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK)
 620                         tbl->is_SGI = 1;
 621
 622                 if ((mcs_rate->rate_n_flags & RATE_MCS_FAT_MSK) ||
 623                     (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK))
 624                         tbl->is_fat = 1;
 625
 626                 if (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK)
 627                         tbl->is_dup = 1;
 628
 629                 *rate_idx = index;
 630
 631         /* HT rate format, MIMO (might be 20 MHz legacy or 40 MHz fat width) */
 632         } else {
 633                 tbl->lq_type = LQ_MIMO;
 634                 if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK)
 635                         tbl->is_SGI = 1;
 636
 637                 if ((mcs_rate->rate_n_flags & RATE_MCS_FAT_MSK) ||
 638                     (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK))
 639                         tbl->is_fat = 1;
 640
 641                 if (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK)
 642                         tbl->is_dup = 1;
 643                 *rate_idx = index;
 644         }
 645         return 0;
 646 }
 647
 648 static inline void rs_toggle_antenna(struct iwl4965_rate *new_rate,
 649                                      struct iwl4965_scale_tbl_info *tbl)
 650 {
 651         if (tbl->antenna_type == ANT_AUX) {
 652                 tbl->antenna_type = ANT_MAIN;
 653                 new_rate->rate_n_flags &= ~RATE_MCS_ANT_B_MSK;
 654                 new_rate->rate_n_flags |= RATE_MCS_ANT_A_MSK;
 655         } else {
 656                 tbl->antenna_type = ANT_AUX;
 657                 new_rate->rate_n_flags &= ~RATE_MCS_ANT_A_MSK;
 658                 new_rate->rate_n_flags |= RATE_MCS_ANT_B_MSK;
 659         }
 660 }
 661
 662 static inline u8 rs_use_green(struct iwl_priv *priv,
 663                               struct ieee80211_conf *conf)
 664 {
 665 #ifdef CONFIG_IWL4965_HT
 666         return ((conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) &&
 667                 priv->current_ht_config.is_green_field &&
 668                 !priv->current_ht_config.non_GF_STA_present);
 669 #endif  /* CONFIG_IWL4965_HT */
 670         return 0;
 671 }
 672
 673 /**
 674  * rs_get_supported_rates - get the available rates
 675  *
 676  * if management frame or broadcast frame only return
 677  * basic available rates.
 678  *
 679  */
 680 static void rs_get_supported_rates(struct iwl4965_lq_sta *lq_sta,
 681                                    struct ieee80211_hdr *hdr,
 682                                    enum iwl4965_table_type rate_type,
 683                                    u16 *data_rate)
 684 {
 685         if (is_legacy(rate_type))
 686                 *data_rate = lq_sta->active_rate;
 687         else {
 688                 if (is_siso(rate_type))
 689                         *data_rate = lq_sta->active_siso_rate;
 690                 else
 691                         *data_rate = lq_sta->active_mimo_rate;
 692         }
 693
 694         if (hdr && is_multicast_ether_addr(hdr->addr1) &&
 695             lq_sta->active_rate_basic) {
 696                 *data_rate = lq_sta->active_rate_basic;
 697         }
 698 }
 699
 700 static u16 rs_get_adjacent_rate(u8 index, u16 rate_mask, int rate_type)
 701 {
 702         u8 high = IWL_RATE_INVALID;
 703         u8 low = IWL_RATE_INVALID;
 704
 705         /* 802.11A or ht walks to the next literal adjacent rate in
 706          * the rate table */
 707         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 708                 int i;
 709                 u32 mask;
 710
 711                 /* Find the previous rate that is in the rate mask */
 712                 i = index - 1;
 713                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 714                         if (rate_mask & mask) {
 715                                 low = i;
 716                                 break;
 717                         }
 718                 }
 719
 720                 /* Find the next rate that is in the rate mask */
 721                 i = index + 1;
 722                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 723                         if (rate_mask & mask) {
 724                                 high = i;
 725                                 break;
 726                         }
 727                 }
 728
 729                 return (high << 8) | low;
 730         }
 731
 732         low = index;
 733         while (low != IWL_RATE_INVALID) {
 734                 low = iwl4965_rates[low].prev_rs;
 735                 if (low == IWL_RATE_INVALID)
 736                         break;
 737                 if (rate_mask & (1 << low))
 738                         break;
 739                 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
 740         }
 741
 742         high = index;
 743         while (high != IWL_RATE_INVALID) {
 744                 high = iwl4965_rates[high].next_rs;
 745                 if (high == IWL_RATE_INVALID)
 746                         break;
 747                 if (rate_mask & (1 << high))
 748                         break;
 749                 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
 750         }
 751
 752         return (high << 8) | low;
 753 }
 754
 755 static void rs_get_lower_rate(struct iwl4965_lq_sta *lq_sta,
 756                              struct iwl4965_scale_tbl_info *tbl, u8 scale_index,
 757                              u8 ht_possible, struct iwl4965_rate *mcs_rate)
 758 {
 759         s32 low;
 760         u16 rate_mask;
 761         u16 high_low;
 762         u8 switch_to_legacy = 0;
 763         u8 is_green = lq_sta->is_green;
 764
 765         /* check if we need to switch from HT to legacy rates.
 766          * assumption is that mandatory rates (1Mbps or 6Mbps)
 767          * are always supported (spec demand) */
 768         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
 769                 switch_to_legacy = 1;
 770                 scale_index = rs_ht_to_legacy[scale_index];
 771                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 772                         tbl->lq_type = LQ_A;
 773                 else
 774                         tbl->lq_type = LQ_G;
 775
 776                 if ((tbl->antenna_type == ANT_BOTH) ||
 777                     (tbl->antenna_type == ANT_NONE))
 778                         tbl->antenna_type = ANT_MAIN;
 779
 780                 tbl->is_fat = 0;
 781                 tbl->is_SGI = 0;
 782         }
 783
 784         rs_get_supported_rates(lq_sta, NULL, tbl->lq_type, &rate_mask);
 785
 786         /* Mask with station rate restriction */
 787         if (is_legacy(tbl->lq_type)) {
 788                 /* supp_rates has no CCK bits in A mode */
 789                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 790                         rate_mask  = (u16)(rate_mask &
 791                            (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
 792                 else
 793                         rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
 794         }
 795
 796         /* If we switched from HT to legacy, check current rate */
 797         if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
 798                 rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green);
 799                 return;
 800         }
 801
 802         high_low = rs_get_adjacent_rate(scale_index, rate_mask, tbl->lq_type);
 803         low = high_low & 0xff;
 804
 805         if (low != IWL_RATE_INVALID)
 806                 rs_mcs_from_tbl(mcs_rate, tbl, low, is_green);
 807         else
 808                 rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green);
 809 }
 810
 811 /*
 812  * mac80211 sends us Tx status
 813  */
 814 static void rs_tx_status(void *priv_rate, struct net_device *dev,
 815                          struct sk_buff *skb,
 816                          struct ieee80211_tx_status *tx_resp)
 817 {
 818         int status;
 819         u8 retries;
 820         int rs_index, index = 0;
 821         struct iwl4965_lq_sta *lq_sta;
 822         struct iwl4965_link_quality_cmd *table;
 823         struct sta_info *sta;
 824         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 825         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
 826         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 827         struct ieee80211_hw *hw = local_to_hw(local);
 828         struct iwl4965_rate_scale_data *window = NULL;
 829         struct iwl4965_rate_scale_data *search_win = NULL;
 830         struct iwl4965_rate tx_mcs;
 831         struct iwl4965_scale_tbl_info tbl_type;
 832         struct iwl4965_scale_tbl_info *curr_tbl, *search_tbl;
 833         u8 active_index = 0;
 834         u16 fc = le16_to_cpu(hdr->frame_control);
 835         s32 tpt = 0;
 836
 837         IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
 838
 839         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1))
 840                 return;
 841
 842         /* This packet was aggregated but doesn't carry rate scale info */
 843         if ((tx_resp->control.flags & IEEE80211_TXCTL_AMPDU) &&
 844             !(tx_resp->flags & IEEE80211_TX_STATUS_AMPDU))
 845                 return;
 846
 847         retries = tx_resp->retry_count;
 848
 849         if (retries > 15)
 850                 retries = 15;
 851
 852         rcu_read_lock();
 853
 854         sta = sta_info_get(local, hdr->addr1);
 855
 856         if (!sta || !sta->rate_ctrl_priv)
 857                 goto out;
 858
 859
 860         lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
 861
 862         if (!priv->lq_mngr.lq_ready)
 863                 goto out;
 864
 865         if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
 866             !lq_sta->ibss_sta_added)
 867                 goto out;
 868
 869         table = &lq_sta->lq;
 870         active_index = lq_sta->active_tbl;
 871
 872         /* Get mac80211 antenna info */
 873         lq_sta->antenna =
 874                 (lq_sta->valid_antenna & local->hw.conf.antenna_sel_tx);
 875         if (!lq_sta->antenna)
 876                 lq_sta->antenna = lq_sta->valid_antenna;
 877
 878         /* Ignore mac80211 antenna info for now */
 879         lq_sta->antenna = lq_sta->valid_antenna;
 880
 881         curr_tbl = &(lq_sta->lq_info[active_index]);
 882         search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
 883         window = (struct iwl4965_rate_scale_data *)
 884             &(curr_tbl->win[0]);
 885         search_win = (struct iwl4965_rate_scale_data *)
 886             &(search_tbl->win[0]);
 887
 888         /*
 889          * Ignore this Tx frame response if its initial rate doesn't match
 890          * that of latest Link Quality command.  There may be stragglers
 891          * from a previous Link Quality command, but we're no longer interested
 892          * in those; they're either from the "active" mode while we're trying
 893          * to check "search" mode, or a prior "search" mode after we've moved
 894          * to a new "search" mode (which might become the new "active" mode).
 895          */
 896         tx_mcs.rate_n_flags = le32_to_cpu(table->rs_table[0].rate_n_flags);
 897         rs_get_tbl_info_from_mcs(&tx_mcs, priv->band, &tbl_type, &rs_index);
 898         if (priv->band == IEEE80211_BAND_5GHZ)
 899                 rs_index -= IWL_FIRST_OFDM_RATE;
 900
 901         if ((tx_resp->control.tx_rate == NULL) ||
 902             (tbl_type.is_SGI ^
 903                 !!(tx_resp->control.flags & IEEE80211_TXCTL_SHORT_GI)) ||
 904             (tbl_type.is_fat ^
 905                 !!(tx_resp->control.flags & IEEE80211_TXCTL_40_MHZ_WIDTH)) ||
 906             (tbl_type.is_dup ^
 907                 !!(tx_resp->control.flags & IEEE80211_TXCTL_DUP_DATA)) ||
 908             (tbl_type.antenna_type ^
 909                 tx_resp->control.antenna_sel_tx) ||
 910             (!!(tx_mcs.rate_n_flags & RATE_MCS_HT_MSK) ^
 911                 !!(tx_resp->control.flags & IEEE80211_TXCTL_OFDM_HT)) ||
 912             (!!(tx_mcs.rate_n_flags & RATE_MCS_GF_MSK) ^
 913                 !!(tx_resp->control.flags & IEEE80211_TXCTL_GREEN_FIELD)) ||
 914             (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
 915                 tx_resp->control.tx_rate->bitrate)) {
 916                 IWL_DEBUG_RATE("initial rate does not match 0x%x\n",
 917                                 tx_mcs.rate_n_flags);
 918                 goto out;
 919         }
 920
 921         /* Update frame history window with "failure" for each Tx retry. */
 922         while (retries) {
 923                 /* Look up the rate and other info used for each tx attempt.
 924                  * Each tx attempt steps one entry deeper in the rate table. */
 925                 tx_mcs.rate_n_flags =
 926                     le32_to_cpu(table->rs_table[index].rate_n_flags);
 927                 rs_get_tbl_info_from_mcs(&tx_mcs, priv->band,
 928                                           &tbl_type, &rs_index);
 929
 930                 /* If type matches "search" table,
 931                  * add failure to "search" history */
 932                 if ((tbl_type.lq_type == search_tbl->lq_type) &&
 933                     (tbl_type.antenna_type == search_tbl->antenna_type) &&
 934                     (tbl_type.is_SGI == search_tbl->is_SGI)) {
 935                         if (search_tbl->expected_tpt)
 936                                 tpt = search_tbl->expected_tpt[rs_index];
 937                         else
 938                                 tpt = 0;
 939                         rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
 940
 941                 /* Else if type matches "current/active" table,
 942                  * add failure to "current/active" history */
 943                 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
 944                            (tbl_type.antenna_type == curr_tbl->antenna_type) &&
 945                            (tbl_type.is_SGI == curr_tbl->is_SGI)) {
 946                         if (curr_tbl->expected_tpt)
 947                                 tpt = curr_tbl->expected_tpt[rs_index];
 948                         else
 949                                 tpt = 0;
 950                         rs_collect_tx_data(window, rs_index, tpt, 1, 0);
 951                 }
 952
 953                 /* If not searching for a new mode, increment failed counter
 954                  * ... this helps determine when to start searching again */
 955                 if (lq_sta->stay_in_tbl)
 956                         lq_sta->total_failed++;
 957                 --retries;
 958                 index++;
 959
 960         }
 961
 962         /*
 963          * Find (by rate) the history window to update with final Tx attempt;
 964          * if Tx was successful first try, use original rate,
 965          * else look up the rate that was, finally, successful.
 966          */
 967         tx_mcs.rate_n_flags = le32_to_cpu(table->rs_table[index].rate_n_flags);
 968         rs_get_tbl_info_from_mcs(&tx_mcs, priv->band, &tbl_type, &rs_index);
 969
 970         /* Update frame history window with "success" if Tx got ACKed ... */
 971         if (tx_resp->flags & IEEE80211_TX_STATUS_ACK)
 972                 status = 1;
 973         else
 974                 status = 0;
 975
 976         /* If type matches "search" table,
 977          * add final tx status to "search" history */
 978         if ((tbl_type.lq_type == search_tbl->lq_type) &&
 979             (tbl_type.antenna_type == search_tbl->antenna_type) &&
 980             (tbl_type.is_SGI == search_tbl->is_SGI)) {
 981                 if (search_tbl->expected_tpt)
 982                         tpt = search_tbl->expected_tpt[rs_index];
 983                 else
 984                         tpt = 0;
 985                 if (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU)
 986                         rs_collect_tx_data(search_win, rs_index, tpt,
 987                                            tx_resp->ampdu_ack_len,
 988                                            tx_resp->ampdu_ack_map);
 989                 else
 990                         rs_collect_tx_data(search_win, rs_index, tpt,
 991                                            1, status);
 992         /* Else if type matches "current/active" table,
 993          * add final tx status to "current/active" history */
 994         } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
 995                    (tbl_type.antenna_type == curr_tbl->antenna_type) &&
 996                    (tbl_type.is_SGI == curr_tbl->is_SGI)) {
 997                 if (curr_tbl->expected_tpt)
 998                         tpt = curr_tbl->expected_tpt[rs_index];
 999                 else
1000                         tpt = 0;
1001                 if (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU)
1002                         rs_collect_tx_data(window, rs_index, tpt,
1003                                            tx_resp->ampdu_ack_len,
1004                                            tx_resp->ampdu_ack_map);
1005                 else
1006                         rs_collect_tx_data(window, rs_index, tpt,
1007                                            1, status);
1008         }
1009
1010         /* If not searching for new mode, increment success/failed counter
1011          * ... these help determine when to start searching again */
1012         if (lq_sta->stay_in_tbl) {
1013                 if (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU) {
1014                         lq_sta->total_success += tx_resp->ampdu_ack_map;
1015                         lq_sta->total_failed +=
1016                              (tx_resp->ampdu_ack_len - tx_resp->ampdu_ack_map);
1017                 } else {
1018                         if (status)
1019                                 lq_sta->total_success++;
1020                         else
1021                                 lq_sta->total_failed++;
1022                 }
1023         }
1024
1025         /* See if there's a better rate or modulation mode to try. */
1026         rs_rate_scale_perform(priv, dev, hdr, sta);
1027 out:
1028         rcu_read_unlock();
1029         return;
1030 }
1031
1032 static u8 rs_is_ant_connected(u8 valid_antenna,
1033                               enum iwl4965_antenna_type antenna_type)
1034 {
1035         if (antenna_type == ANT_AUX)
1036                 return ((valid_antenna & 0x2) ? 1:0);
1037         else if (antenna_type == ANT_MAIN)
1038                 return ((valid_antenna & 0x1) ? 1:0);
1039         else if (antenna_type == ANT_BOTH)
1040                 return ((valid_antenna & 0x3) == 0x3);
1041
1042         return 1;
1043 }
1044
1045 static u8 rs_is_other_ant_connected(u8 valid_antenna,
1046                                     enum iwl4965_antenna_type antenna_type)
1047 {
1048         if (antenna_type == ANT_AUX)
1049                 return rs_is_ant_connected(valid_antenna, ANT_MAIN);
1050         else
1051                 return rs_is_ant_connected(valid_antenna, ANT_AUX);
1052
1053         return 0;
1054 }
1055
1056 /*
1057  * Begin a period of staying with a selected modulation mode.
1058  * Set "stay_in_tbl" flag to prevent any mode switches.
1059  * Set frame tx success limits according to legacy vs. high-throughput,
1060  * and reset overall (spanning all rates) tx success history statistics.
1061  * These control how long we stay using same modulation mode before
1062  * searching for a new mode.
1063  */
1064 static void rs_set_stay_in_table(u8 is_legacy,
1065                                  struct iwl4965_lq_sta *lq_sta)
1066 {
1067         IWL_DEBUG_HT("we are staying in the same table\n");
1068         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
1069         if (is_legacy) {
1070                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1071                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1072                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1073         } else {
1074                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1075                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1076                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1077         }
1078         lq_sta->table_count = 0;
1079         lq_sta->total_failed = 0;
1080         lq_sta->total_success = 0;
1081 }
1082
1083 /*
1084  * Find correct throughput table for given mode of modulation
1085  */
1086 static void rs_get_expected_tpt_table(struct iwl4965_lq_sta *lq_sta,
1087                                       struct iwl4965_scale_tbl_info *tbl)
1088 {
1089         if (is_legacy(tbl->lq_type)) {
1090                 if (!is_a_band(tbl->lq_type))
1091                         tbl->expected_tpt = expected_tpt_G;
1092                 else
1093                         tbl->expected_tpt = expected_tpt_A;
1094         } else if (is_siso(tbl->lq_type)) {
1095                 if (tbl->is_fat && !lq_sta->is_dup)
1096                         if (tbl->is_SGI)
1097                                 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
1098                         else
1099                                 tbl->expected_tpt = expected_tpt_siso40MHz;
1100                 else if (tbl->is_SGI)
1101                         tbl->expected_tpt = expected_tpt_siso20MHzSGI;
1102                 else
1103                         tbl->expected_tpt = expected_tpt_siso20MHz;
1104
1105         } else if (is_mimo(tbl->lq_type)) {
1106                 if (tbl->is_fat && !lq_sta->is_dup)
1107                         if (tbl->is_SGI)
1108                                 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
1109                         else
1110                                 tbl->expected_tpt = expected_tpt_mimo40MHz;
1111                 else if (tbl->is_SGI)
1112                         tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
1113                 else
1114                         tbl->expected_tpt = expected_tpt_mimo20MHz;
1115         } else
1116                 tbl->expected_tpt = expected_tpt_G;
1117 }
1118
1119 #ifdef CONFIG_IWL4965_HT
1120 /*
1121  * Find starting rate for new "search" high-throughput mode of modulation.
1122  * Goal is to find lowest expected rate (under perfect conditions) that is
1123  * above the current measured throughput of "active" mode, to give new mode
1124  * a fair chance to prove itself without too many challenges.
1125  *
1126  * This gets called when transitioning to more aggressive modulation
1127  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1128  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1129  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1130  * bit rate will typically need to increase, but not if performance was bad.
1131  */
1132 static s32 rs_get_best_rate(struct iwl_priv *priv,
1133                             struct iwl4965_lq_sta *lq_sta,
1134                             struct iwl4965_scale_tbl_info *tbl, /* "search" */
1135                             u16 rate_mask, s8 index, s8 rate)
1136 {
1137         /* "active" values */
1138         struct iwl4965_scale_tbl_info *active_tbl =
1139             &(lq_sta->lq_info[lq_sta->active_tbl]);
1140         s32 active_sr = active_tbl->win[index].success_ratio;
1141         s32 active_tpt = active_tbl->expected_tpt[index];
1142
1143         /* expected "search" throughput */
1144         s32 *tpt_tbl = tbl->expected_tpt;
1145
1146         s32 new_rate, high, low, start_hi;
1147         u16 high_low;
1148
1149         new_rate = high = low = start_hi = IWL_RATE_INVALID;
1150
1151         for (; ;) {
1152                 high_low = rs_get_adjacent_rate(rate, rate_mask, tbl->lq_type);
1153
1154                 low = high_low & 0xff;
1155                 high = (high_low >> 8) & 0xff;
1156
1157                 /*
1158                  * Lower the "search" bit rate, to give new "search" mode
1159                  * approximately the same throughput as "active" if:
1160                  *
1161                  * 1) "Active" mode has been working modestly well (but not
1162                  *    great), and expected "search" throughput (under perfect
1163                  *    conditions) at candidate rate is above the actual
1164                  *    measured "active" throughput (but less than expected
1165                  *    "active" throughput under perfect conditions).
1166                  * OR
1167                  * 2) "Active" mode has been working perfectly or very well
1168                  *    and expected "search" throughput (under perfect
1169                  *    conditions) at candidate rate is above expected
1170                  *    "active" throughput (under perfect conditions).
1171                  */
1172                 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1173                      ((active_sr > IWL_RATE_DECREASE_TH) &&
1174                       (active_sr <= IWL_RATE_HIGH_TH) &&
1175                       (tpt_tbl[rate] <= active_tpt))) ||
1176                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1177                      (tpt_tbl[rate] > active_tpt))) {
1178
1179                         /* (2nd or later pass)
1180                          * If we've already tried to raise the rate, and are
1181                          * now trying to lower it, use the higher rate. */
1182                         if (start_hi != IWL_RATE_INVALID) {
1183                                 new_rate = start_hi;
1184                                 break;
1185                         }
1186
1187                         new_rate = rate;
1188
1189                         /* Loop again with lower rate */
1190                         if (low != IWL_RATE_INVALID)
1191                                 rate = low;
1192
1193                         /* Lower rate not available, use the original */
1194                         else
1195                                 break;
1196
1197                 /* Else try to raise the "search" rate to match "active" */
1198                 } else {
1199                         /* (2nd or later pass)
1200                          * If we've already tried to lower the rate, and are
1201                          * now trying to raise it, use the lower rate. */
1202                         if (new_rate != IWL_RATE_INVALID)
1203                                 break;
1204
1205                         /* Loop again with higher rate */
1206                         else if (high != IWL_RATE_INVALID) {
1207                                 start_hi = high;
1208                                 rate = high;
1209
1210                         /* Higher rate not available, use the original */
1211                         } else {
1212                                 new_rate = rate;
1213                                 break;
1214                         }
1215                 }
1216         }
1217
1218         return new_rate;
1219 }
1220 #endif                          /* CONFIG_IWL4965_HT */
1221
1222 static inline u8 rs_is_both_ant_supp(u8 valid_antenna)
1223 {
1224         return (rs_is_ant_connected(valid_antenna, ANT_BOTH));
1225 }
1226
1227 /*
1228  * Set up search table for MIMO
1229  */
1230 static int rs_switch_to_mimo(struct iwl_priv *priv,
1231                              struct iwl4965_lq_sta *lq_sta,
1232                              struct ieee80211_conf *conf,
1233                              struct sta_info *sta,
1234                              struct iwl4965_scale_tbl_info *tbl, int index)
1235 {
1236 #ifdef CONFIG_IWL4965_HT
1237         u16 rate_mask;
1238         s32 rate;
1239         s8 is_green = lq_sta->is_green;
1240
1241         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1242             !sta->ht_info.ht_supported)
1243                 return -1;
1244
1245         IWL_DEBUG_HT("LQ: try to switch to MIMO\n");
1246         tbl->lq_type = LQ_MIMO;
1247         rs_get_supported_rates(lq_sta, NULL, tbl->lq_type,
1248                                 &rate_mask);
1249
1250         if (priv->current_ht_config.tx_mimo_ps_mode == IWL_MIMO_PS_STATIC)
1251                 return -1;
1252
1253         /* Need both Tx chains/antennas to support MIMO */
1254         if (!rs_is_both_ant_supp(lq_sta->antenna))
1255                 return -1;
1256
1257         tbl->is_dup = lq_sta->is_dup;
1258         tbl->action = 0;
1259         if (priv->current_ht_config.supported_chan_width
1260             == IWL_CHANNEL_WIDTH_40MHZ)
1261                 tbl->is_fat = 1;
1262         else
1263                 tbl->is_fat = 0;
1264
1265         if (tbl->is_fat) {
1266                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1267                         tbl->is_SGI = 1;
1268                 else
1269                         tbl->is_SGI = 0;
1270         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1271                 tbl->is_SGI = 1;
1272         else
1273                 tbl->is_SGI = 0;
1274
1275         rs_get_expected_tpt_table(lq_sta, tbl);
1276
1277         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index, index);
1278
1279         IWL_DEBUG_HT("LQ: MIMO best rate %d mask %X\n", rate, rate_mask);
1280         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask))
1281                 return -1;
1282         rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green);
1283
1284         IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
1285                      tbl->current_rate.rate_n_flags, is_green);
1286         return 0;
1287 #else
1288         return -1;
1289 #endif  /*CONFIG_IWL4965_HT */
1290 }
1291
1292 /*
1293  * Set up search table for SISO
1294  */
1295 static int rs_switch_to_siso(struct iwl_priv *priv,
1296                              struct iwl4965_lq_sta *lq_sta,
1297                              struct ieee80211_conf *conf,
1298                              struct sta_info *sta,
1299                              struct iwl4965_scale_tbl_info *tbl, int index)
1300 {
1301 #ifdef CONFIG_IWL4965_HT
1302         u16 rate_mask;
1303         u8 is_green = lq_sta->is_green;
1304         s32 rate;
1305
1306         IWL_DEBUG_HT("LQ: try to switch to SISO\n");
1307         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1308             !sta->ht_info.ht_supported)
1309                 return -1;
1310
1311         tbl->is_dup = lq_sta->is_dup;
1312         tbl->lq_type = LQ_SISO;
1313         tbl->action = 0;
1314         rs_get_supported_rates(lq_sta, NULL, tbl->lq_type,
1315                                 &rate_mask);
1316
1317         if (priv->current_ht_config.supported_chan_width
1318             == IWL_CHANNEL_WIDTH_40MHZ)
1319                 tbl->is_fat = 1;
1320         else
1321                 tbl->is_fat = 0;
1322
1323         if (tbl->is_fat) {
1324                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1325                         tbl->is_SGI = 1;
1326                 else
1327                         tbl->is_SGI = 0;
1328         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1329                 tbl->is_SGI = 1;
1330         else
1331                 tbl->is_SGI = 0;
1332
1333         if (is_green)
1334                 tbl->is_SGI = 0;
1335
1336         rs_get_expected_tpt_table(lq_sta, tbl);
1337         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index, index);
1338
1339         IWL_DEBUG_HT("LQ: get best rate %d mask %X\n", rate, rate_mask);
1340         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1341                 IWL_DEBUG_HT("can not switch with index %d rate mask %x\n",
1342                              rate, rate_mask);
1343                 return -1;
1344         }
1345         rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green);
1346         IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
1347                      tbl->current_rate.rate_n_flags, is_green);
1348         return 0;
1349 #else
1350         return -1;
1351
1352 #endif  /*CONFIG_IWL4965_HT */
1353 }
1354
1355 /*
1356  * Try to switch to new modulation mode from legacy
1357  */
1358 static int rs_move_legacy_other(struct iwl_priv *priv,
1359                                 struct iwl4965_lq_sta *lq_sta,
1360                                 struct ieee80211_conf *conf,
1361                                 struct sta_info *sta,
1362                                 int index)
1363 {
1364         int ret = 0;
1365         struct iwl4965_scale_tbl_info *tbl =
1366             &(lq_sta->lq_info[lq_sta->active_tbl]);
1367         struct iwl4965_scale_tbl_info *search_tbl =
1368             &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1369         struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1370         u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1371                   (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1372         u8 start_action = tbl->action;
1373
1374         for (; ;) {
1375                 switch (tbl->action) {
1376                 case IWL_LEGACY_SWITCH_ANTENNA:
1377                         IWL_DEBUG_HT("LQ Legacy switch Antenna\n");
1378
1379                         search_tbl->lq_type = LQ_NONE;
1380                         lq_sta->action_counter++;
1381
1382                         /* Don't change antenna if success has been great */
1383                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1384                                 break;
1385
1386                         /* Don't change antenna if other one is not connected */
1387                         if (!rs_is_other_ant_connected(lq_sta->antenna,
1388                                                         tbl->antenna_type))
1389                                 break;
1390
1391                         /* Set up search table to try other antenna */
1392                         memcpy(search_tbl, tbl, sz);
1393
1394                         rs_toggle_antenna(&(search_tbl->current_rate),
1395                                            search_tbl);
1396                         rs_get_expected_tpt_table(lq_sta, search_tbl);
1397                         lq_sta->search_better_tbl = 1;
1398                         goto out;
1399
1400                 case IWL_LEGACY_SWITCH_SISO:
1401                         IWL_DEBUG_HT("LQ: Legacy switch to SISO\n");
1402
1403                         /* Set up search table to try SISO */
1404                         memcpy(search_tbl, tbl, sz);
1405                         search_tbl->lq_type = LQ_SISO;
1406                         search_tbl->is_SGI = 0;
1407                         search_tbl->is_fat = 0;
1408                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1409                                                  search_tbl, index);
1410                         if (!ret) {
1411                                 lq_sta->search_better_tbl = 1;
1412                                 lq_sta->action_counter = 0;
1413                                 goto out;
1414                         }
1415
1416                         break;
1417                 case IWL_LEGACY_SWITCH_MIMO:
1418                         IWL_DEBUG_HT("LQ: Legacy switch MIMO\n");
1419
1420                         /* Set up search table to try MIMO */
1421                         memcpy(search_tbl, tbl, sz);
1422                         search_tbl->lq_type = LQ_MIMO;
1423                         search_tbl->is_SGI = 0;
1424                         search_tbl->is_fat = 0;
1425                         search_tbl->antenna_type = ANT_BOTH;
1426                         ret = rs_switch_to_mimo(priv, lq_sta, conf, sta,
1427                                                  search_tbl, index);
1428                         if (!ret) {
1429                                 lq_sta->search_better_tbl = 1;
1430                                 lq_sta->action_counter = 0;
1431                                 goto out;
1432                         }
1433                         break;
1434                 }
1435                 tbl->action++;
1436                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO)
1437                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1438
1439                 if (tbl->action == start_action)
1440                         break;
1441
1442         }
1443         return 0;
1444
1445  out:
1446         tbl->action++;
1447         if (tbl->action > IWL_LEGACY_SWITCH_MIMO)
1448                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1449         return 0;
1450
1451 }
1452
1453 /*
1454  * Try to switch to new modulation mode from SISO
1455  */
1456 static int rs_move_siso_to_other(struct iwl_priv *priv,
1457                                  struct iwl4965_lq_sta *lq_sta,
1458                                  struct ieee80211_conf *conf,
1459                                  struct sta_info *sta,
1460                                  int index)
1461 {
1462         int ret;
1463         u8 is_green = lq_sta->is_green;
1464         struct iwl4965_scale_tbl_info *tbl =
1465             &(lq_sta->lq_info[lq_sta->active_tbl]);
1466         struct iwl4965_scale_tbl_info *search_tbl =
1467             &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1468         struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1469         u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1470                   (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1471         u8 start_action = tbl->action;
1472
1473         for (;;) {
1474                 lq_sta->action_counter++;
1475                 switch (tbl->action) {
1476                 case IWL_SISO_SWITCH_ANTENNA:
1477                         IWL_DEBUG_HT("LQ: SISO SWITCH ANTENNA SISO\n");
1478                         search_tbl->lq_type = LQ_NONE;
1479                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1480                                 break;
1481                         if (!rs_is_other_ant_connected(lq_sta->antenna,
1482                                                        tbl->antenna_type))
1483                                 break;
1484
1485                         memcpy(search_tbl, tbl, sz);
1486                         search_tbl->action = IWL_SISO_SWITCH_MIMO;
1487                         rs_toggle_antenna(&(search_tbl->current_rate),
1488                                            search_tbl);
1489                         lq_sta->search_better_tbl = 1;
1490
1491                         goto out;
1492
1493                 case IWL_SISO_SWITCH_MIMO:
1494                         IWL_DEBUG_HT("LQ: SISO SWITCH TO MIMO FROM SISO\n");
1495                         memcpy(search_tbl, tbl, sz);
1496                         search_tbl->lq_type = LQ_MIMO;
1497                         search_tbl->is_SGI = 0;
1498                         search_tbl->is_fat = 0;
1499                         search_tbl->antenna_type = ANT_BOTH;
1500                         ret = rs_switch_to_mimo(priv, lq_sta, conf, sta,
1501                                                  search_tbl, index);
1502                         if (!ret) {
1503                                 lq_sta->search_better_tbl = 1;
1504                                 goto out;
1505                         }
1506                         break;
1507                 case IWL_SISO_SWITCH_GI:
1508                         IWL_DEBUG_HT("LQ: SISO SWITCH TO GI\n");
1509
1510                         memcpy(search_tbl, tbl, sz);
1511                         search_tbl->action = 0;
1512                         if (search_tbl->is_SGI)
1513                                 search_tbl->is_SGI = 0;
1514                         else if (!is_green)
1515                                 search_tbl->is_SGI = 1;
1516                         else
1517                                 break;
1518                         lq_sta->search_better_tbl = 1;
1519                         if ((tbl->lq_type == LQ_SISO) &&
1520                             (tbl->is_SGI)) {
1521                                 s32 tpt = lq_sta->last_tpt / 100;
1522                                 if (((!tbl->is_fat) &&
1523                                      (tpt >= expected_tpt_siso20MHz[index])) ||
1524                                     ((tbl->is_fat) &&
1525                                      (tpt >= expected_tpt_siso40MHz[index])))
1526                                         lq_sta->search_better_tbl = 0;
1527                         }
1528                         rs_get_expected_tpt_table(lq_sta, search_tbl);
1529                         rs_mcs_from_tbl(&search_tbl->current_rate,
1530                                              search_tbl, index, is_green);
1531                         goto out;
1532                 }
1533                 tbl->action++;
1534                 if (tbl->action > IWL_SISO_SWITCH_GI)
1535                         tbl->action = IWL_SISO_SWITCH_ANTENNA;
1536
1537                 if (tbl->action == start_action)
1538                         break;
1539         }
1540         return 0;
1541
1542  out:
1543         tbl->action++;
1544         if (tbl->action > IWL_SISO_SWITCH_GI)
1545                 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1546         return 0;
1547 }
1548
1549 /*
1550  * Try to switch to new modulation mode from MIMO
1551  */
1552 static int rs_move_mimo_to_other(struct iwl_priv *priv,
1553                                  struct iwl4965_lq_sta *lq_sta,
1554                                  struct ieee80211_conf *conf,
1555                                  struct sta_info *sta,
1556                                  int index)
1557 {
1558         int ret;
1559         s8 is_green = lq_sta->is_green;
1560         struct iwl4965_scale_tbl_info *tbl =
1561             &(lq_sta->lq_info[lq_sta->active_tbl]);
1562         struct iwl4965_scale_tbl_info *search_tbl =
1563             &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1564         u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1565                   (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1566         u8 start_action = tbl->action;
1567
1568         for (;;) {
1569                 lq_sta->action_counter++;
1570                 switch (tbl->action) {
1571                 case IWL_MIMO_SWITCH_ANTENNA_A:
1572                 case IWL_MIMO_SWITCH_ANTENNA_B:
1573                         IWL_DEBUG_HT("LQ: MIMO SWITCH TO SISO\n");
1574
1575
1576                         /* Set up new search table for SISO */
1577                         memcpy(search_tbl, tbl, sz);
1578                         search_tbl->lq_type = LQ_SISO;
1579                         search_tbl->is_SGI = 0;
1580                         search_tbl->is_fat = 0;
1581                         if (tbl->action == IWL_MIMO_SWITCH_ANTENNA_A)
1582                                 search_tbl->antenna_type = ANT_MAIN;
1583                         else
1584                                 search_tbl->antenna_type = ANT_AUX;
1585
1586                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1587                                                  search_tbl, index);
1588                         if (!ret) {
1589                                 lq_sta->search_better_tbl = 1;
1590                                 goto out;
1591                         }
1592                         break;
1593
1594                 case IWL_MIMO_SWITCH_GI:
1595                         IWL_DEBUG_HT("LQ: MIMO SWITCH TO GI\n");
1596
1597                         /* Set up new search table for MIMO */
1598                         memcpy(search_tbl, tbl, sz);
1599                         search_tbl->lq_type = LQ_MIMO;
1600                         search_tbl->antenna_type = ANT_BOTH;
1601                         search_tbl->action = 0;
1602                         if (search_tbl->is_SGI)
1603                                 search_tbl->is_SGI = 0;
1604                         else
1605                                 search_tbl->is_SGI = 1;
1606                         lq_sta->search_better_tbl = 1;
1607
1608                         /*
1609                          * If active table already uses the fastest possible
1610                          * modulation (dual stream with short guard interval),
1611                          * and it's working well, there's no need to look
1612                          * for a better type of modulation!
1613                          */
1614                         if ((tbl->lq_type == LQ_MIMO) &&
1615                             (tbl->is_SGI)) {
1616                                 s32 tpt = lq_sta->last_tpt / 100;
1617                                 if (((!tbl->is_fat) &&
1618                                      (tpt >= expected_tpt_mimo20MHz[index])) ||
1619                                     ((tbl->is_fat) &&
1620                                      (tpt >= expected_tpt_mimo40MHz[index])))
1621                                         lq_sta->search_better_tbl = 0;
1622                         }
1623                         rs_get_expected_tpt_table(lq_sta, search_tbl);
1624                         rs_mcs_from_tbl(&search_tbl->current_rate,
1625                                              search_tbl, index, is_green);
1626                         goto out;
1627
1628                 }
1629                 tbl->action++;
1630                 if (tbl->action > IWL_MIMO_SWITCH_GI)
1631                         tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1632
1633                 if (tbl->action == start_action)
1634                         break;
1635         }
1636
1637         return 0;
1638  out:
1639         tbl->action++;
1640         if (tbl->action > IWL_MIMO_SWITCH_GI)
1641                 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1642         return 0;
1643
1644 }
1645
1646 /*
1647  * Check whether we should continue using same modulation mode, or
1648  * begin search for a new mode, based on:
1649  * 1) # tx successes or failures while using this mode
1650  * 2) # times calling this function
1651  * 3) elapsed time in this mode (not used, for now)
1652  */
1653 static void rs_stay_in_table(struct iwl4965_lq_sta *lq_sta)
1654 {
1655         struct iwl4965_scale_tbl_info *tbl;
1656         int i;
1657         int active_tbl;
1658         int flush_interval_passed = 0;
1659
1660         active_tbl = lq_sta->active_tbl;
1661
1662         tbl = &(lq_sta->lq_info[active_tbl]);
1663
1664         /* If we've been disallowing search, see if we should now allow it */
1665         if (lq_sta->stay_in_tbl) {
1666
1667                 /* Elapsed time using current modulation mode */
1668                 if (lq_sta->flush_timer)
1669                         flush_interval_passed =
1670                             time_after(jiffies,
1671                                        (unsigned long)(lq_sta->flush_timer +
1672                                         IWL_RATE_SCALE_FLUSH_INTVL));
1673
1674                 /* For now, disable the elapsed time criterion */
1675                 flush_interval_passed = 0;
1676
1677                 /*
1678                  * Check if we should allow search for new modulation mode.
1679                  * If many frames have failed or succeeded, or we've used
1680                  * this same modulation for a long time, allow search, and
1681                  * reset history stats that keep track of whether we should
1682                  * allow a new search.  Also (below) reset all bitmaps and
1683                  * stats in active history.
1684                  */
1685                 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1686                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1687                     ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1688                      && (flush_interval_passed))) {
1689                         IWL_DEBUG_HT("LQ: stay is expired %d %d %d\n:",
1690                                      lq_sta->total_failed,
1691                                      lq_sta->total_success,
1692                                      flush_interval_passed);
1693
1694                         /* Allow search for new mode */
1695                         lq_sta->stay_in_tbl = 0;        /* only place reset */
1696                         lq_sta->total_failed = 0;
1697                         lq_sta->total_success = 0;
1698                         lq_sta->flush_timer = 0;
1699
1700                 /*
1701                  * Else if we've used this modulation mode enough repetitions
1702                  * (regardless of elapsed time or success/failure), reset
1703                  * history bitmaps and rate-specific stats for all rates in
1704                  * active table.
1705                  */
1706                 } else {
1707                         lq_sta->table_count++;
1708                         if (lq_sta->table_count >=
1709                             lq_sta->table_count_limit) {
1710                                 lq_sta->table_count = 0;
1711
1712                                 IWL_DEBUG_HT("LQ: stay in table clear win\n");
1713                                 for (i = 0; i < IWL_RATE_COUNT; i++)
1714                                         rs_rate_scale_clear_window(
1715                                                 &(tbl->win[i]));
1716                         }
1717                 }
1718
1719                 /* If transitioning to allow "search", reset all history
1720                  * bitmaps and stats in active table (this will become the new
1721                  * "search" table). */
1722                 if (!lq_sta->stay_in_tbl) {
1723                         for (i = 0; i < IWL_RATE_COUNT; i++)
1724                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1725                 }
1726         }
1727 }
1728
1729 /*
1730  * Do rate scaling and search for new modulation mode.
1731  */
1732 static void rs_rate_scale_perform(struct iwl_priv *priv,
1733                                   struct net_device *dev,
1734                                   struct ieee80211_hdr *hdr,
1735                                   struct sta_info *sta)
1736 {
1737         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1738         struct ieee80211_hw *hw = local_to_hw(local);
1739         struct ieee80211_conf *conf = &hw->conf;
1740         int low = IWL_RATE_INVALID;
1741         int high = IWL_RATE_INVALID;
1742         int index;
1743         int i;
1744         struct iwl4965_rate_scale_data *window = NULL;
1745         int current_tpt = IWL_INVALID_VALUE;
1746         int low_tpt = IWL_INVALID_VALUE;
1747         int high_tpt = IWL_INVALID_VALUE;
1748         u32 fail_count;
1749         s8 scale_action = 0;
1750         u16 fc, rate_mask;
1751         u8 update_lq = 0;
1752         struct iwl4965_lq_sta *lq_sta;
1753         struct iwl4965_scale_tbl_info *tbl, *tbl1;
1754         u16 rate_scale_index_msk = 0;
1755         struct iwl4965_rate mcs_rate;
1756         u8 is_green = 0;
1757         u8 active_tbl = 0;
1758         u8 done_search = 0;
1759         u16 high_low;
1760 #ifdef CONFIG_IWL4965_HT
1761         u8 tid = MAX_TID_COUNT;
1762         __le16 *qc;
1763 #endif
1764
1765         IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1766
1767         fc = le16_to_cpu(hdr->frame_control);
1768         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
1769                 /* Send management frames and broadcast/multicast data using
1770                  * lowest rate. */
1771                 /* TODO: this could probably be improved.. */
1772                 return;
1773         }
1774
1775         if (!sta || !sta->rate_ctrl_priv)
1776                 return;
1777
1778         if (!priv->lq_mngr.lq_ready) {
1779                 IWL_DEBUG_RATE("still rate scaling not ready\n");
1780                 return;
1781         }
1782         lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
1783
1784 #ifdef CONFIG_IWL4965_HT
1785         qc = ieee80211_get_qos_ctrl(hdr);
1786         if (qc) {
1787                 tid = (u8)(le16_to_cpu(*qc) & 0xf);
1788                 rs_tl_add_packet(lq_sta, tid);
1789         }
1790 #endif
1791         /*
1792          * Select rate-scale / modulation-mode table to work with in
1793          * the rest of this function:  "search" if searching for better
1794          * modulation mode, or "active" if doing rate scaling within a mode.
1795          */
1796         if (!lq_sta->search_better_tbl)
1797                 active_tbl = lq_sta->active_tbl;
1798         else
1799                 active_tbl = 1 - lq_sta->active_tbl;
1800
1801         tbl = &(lq_sta->lq_info[active_tbl]);
1802         is_green = lq_sta->is_green;
1803
1804         /* current tx rate */
1805         index = sta->last_txrate_idx;
1806
1807         IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1808                        tbl->lq_type);
1809
1810         /* rates available for this association, and for modulation mode */
1811         rs_get_supported_rates(lq_sta, hdr, tbl->lq_type,
1812                                 &rate_mask);
1813
1814         IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1815
1816         /* mask with station rate restriction */
1817         if (is_legacy(tbl->lq_type)) {
1818                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1819                         /* supp_rates has no CCK bits in A mode */
1820                         rate_scale_index_msk = (u16) (rate_mask &
1821                                 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1822                 else
1823                         rate_scale_index_msk = (u16) (rate_mask &
1824                                                       lq_sta->supp_rates);
1825
1826         } else
1827                 rate_scale_index_msk = rate_mask;
1828
1829         if (!rate_scale_index_msk)
1830                 rate_scale_index_msk = rate_mask;
1831
1832         /* If current rate is no longer supported on current association,
1833          * or user changed preferences for rates, find a new supported rate. */
1834         if (index < 0 || !((1 << index) & rate_scale_index_msk)) {
1835                 index = IWL_INVALID_VALUE;
1836                 update_lq = 1;
1837
1838                 /* get the highest available rate */
1839                 for (i = 0; i <= IWL_RATE_COUNT; i++) {
1840                         if ((1 << i) & rate_scale_index_msk)
1841                                 index = i;
1842                 }
1843
1844                 if (index == IWL_INVALID_VALUE) {
1845                         IWL_WARNING("Can not find a suitable rate\n");
1846                         return;
1847                 }
1848         }
1849
1850         /* Get expected throughput table and history window for current rate */
1851         if (!tbl->expected_tpt)
1852                 rs_get_expected_tpt_table(lq_sta, tbl);
1853
1854         window = &(tbl->win[index]);
1855
1856         /*
1857          * If there is not enough history to calculate actual average
1858          * throughput, keep analyzing results of more tx frames, without
1859          * changing rate or mode (bypass most of the rest of this function).
1860          * Set up new rate table in uCode only if old rate is not supported
1861          * in current association (use new rate found above).
1862          */
1863         fail_count = window->counter - window->success_counter;
1864         if (((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1865              (window->success_counter < IWL_RATE_MIN_SUCCESS_TH))
1866             || (tbl->expected_tpt == NULL)) {
1867                 IWL_DEBUG_RATE("LQ: still below TH succ %d total %d "
1868                                "for index %d\n",
1869                                window->success_counter, window->counter, index);
1870
1871                 /* Can't calculate this yet; not enough history */
1872                 window->average_tpt = IWL_INVALID_VALUE;
1873
1874                 /* Should we stay with this modulation mode,
1875                  * or search for a new one? */
1876                 rs_stay_in_table(lq_sta);
1877
1878                 /* Set up new rate table in uCode, if needed */
1879                 if (update_lq) {
1880                         rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green);
1881                         rs_fill_link_cmd(lq_sta, &mcs_rate, &lq_sta->lq);
1882                         rs_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1883                 }
1884                 goto out;
1885
1886         /* Else we have enough samples; calculate estimate of
1887          * actual average throughput */
1888         } else
1889                 window->average_tpt = ((window->success_ratio *
1890                                         tbl->expected_tpt[index] + 64) / 128);
1891
1892         /* If we are searching for better modulation mode, check success. */
1893         if (lq_sta->search_better_tbl) {
1894                 int success_limit = IWL_RATE_SCALE_SWITCH;
1895
1896                 /* If good success, continue using the "search" mode;
1897                  * no need to send new link quality command, since we're
1898                  * continuing to use the setup that we've been trying. */
1899                 if ((window->success_ratio > success_limit) ||
1900                     (window->average_tpt > lq_sta->last_tpt)) {
1901                         if (!is_legacy(tbl->lq_type)) {
1902                                 IWL_DEBUG_HT("LQ: we are switching to HT"
1903                                              " rate suc %d current tpt %d"
1904                                              " old tpt %d\n",
1905                                              window->success_ratio,
1906                                              window->average_tpt,
1907                                              lq_sta->last_tpt);
1908                                 lq_sta->enable_counter = 1;
1909                         }
1910                         /* Swap tables; "search" becomes "active" */
1911                         lq_sta->active_tbl = active_tbl;
1912                         current_tpt = window->average_tpt;
1913
1914                 /* Else poor success; go back to mode in "active" table */
1915                 } else {
1916                         /* Nullify "search" table */
1917                         tbl->lq_type = LQ_NONE;
1918
1919                         /* Revert to "active" table */
1920                         active_tbl = lq_sta->active_tbl;
1921                         tbl = &(lq_sta->lq_info[active_tbl]);
1922
1923                         /* Revert to "active" rate and throughput info */
1924                         index = iwl4965_hwrate_to_plcp_idx(
1925                                 tbl->current_rate.rate_n_flags);
1926                         current_tpt = lq_sta->last_tpt;
1927
1928                         /* Need to set up a new rate table in uCode */
1929                         update_lq = 1;
1930                         IWL_DEBUG_HT("XXY GO BACK TO OLD TABLE\n");
1931                 }
1932
1933                 /* Either way, we've made a decision; modulation mode
1934                  * search is done, allow rate adjustment next time. */
1935                 lq_sta->search_better_tbl = 0;
1936                 done_search = 1;        /* Don't switch modes below! */
1937                 goto lq_update;
1938         }
1939
1940         /* (Else) not in search of better modulation mode, try for better
1941          * starting rate, while staying in this mode. */
1942         high_low = rs_get_adjacent_rate(index, rate_scale_index_msk,
1943                                         tbl->lq_type);
1944         low = high_low & 0xff;
1945         high = (high_low >> 8) & 0xff;
1946
1947         /* Collect measured throughputs for current and adjacent rates */
1948         current_tpt = window->average_tpt;
1949         if (low != IWL_RATE_INVALID)
1950                 low_tpt = tbl->win[low].average_tpt;
1951         if (high != IWL_RATE_INVALID)
1952                 high_tpt = tbl->win[high].average_tpt;
1953
1954         /* Assume rate increase */
1955         scale_action = 1;
1956
1957         /* Too many failures, decrease rate */
1958         if ((window->success_ratio <= IWL_RATE_DECREASE_TH) ||
1959             (current_tpt == 0)) {
1960                 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1961                 scale_action = -1;
1962
1963         /* No throughput measured yet for adjacent rates; try increase. */
1964         } else if ((low_tpt == IWL_INVALID_VALUE) &&
1965                    (high_tpt == IWL_INVALID_VALUE))
1966                 scale_action = 1;
1967
1968         /* Both adjacent throughputs are measured, but neither one has better
1969          * throughput; we're using the best rate, don't change it! */
1970         else if ((low_tpt != IWL_INVALID_VALUE) &&
1971                  (high_tpt != IWL_INVALID_VALUE) &&
1972                  (low_tpt < current_tpt) &&
1973                  (high_tpt < current_tpt))
1974                 scale_action = 0;
1975
1976         /* At least one adjacent rate's throughput is measured,
1977          * and may have better performance. */
1978         else {
1979                 /* Higher adjacent rate's throughput is measured */
1980                 if (high_tpt != IWL_INVALID_VALUE) {
1981                         /* Higher rate has better throughput */
1982                         if (high_tpt > current_tpt)
1983                                 scale_action = 1;
1984                         else {
1985                                 IWL_DEBUG_RATE
1986                                     ("decrease rate because of high tpt\n");
1987                                 scale_action = -1;
1988                         }
1989
1990                 /* Lower adjacent rate's throughput is measured */
1991                 } else if (low_tpt != IWL_INVALID_VALUE) {
1992                         /* Lower rate has better throughput */
1993                         if (low_tpt > current_tpt) {
1994                                 IWL_DEBUG_RATE
1995                                     ("decrease rate because of low tpt\n");
1996                                 scale_action = -1;
1997                         } else
1998                                 scale_action = 1;
1999                 }
2000         }
2001
2002         /* Sanity check; asked for decrease, but success rate or throughput
2003          * has been good at old rate.  Don't change it. */
2004         if (scale_action == -1) {
2005                 if ((low != IWL_RATE_INVALID) &&
2006                     ((window->success_ratio > IWL_RATE_HIGH_TH) ||
2007                      (current_tpt > (100 * tbl->expected_tpt[low]))))
2008                         scale_action = 0;
2009
2010         /* Sanity check; asked for increase, but success rate has not been great
2011          * even at old rate, higher rate will be worse.  Don't change it. */
2012         } else if ((scale_action == 1) &&
2013                    (window->success_ratio < IWL_RATE_INCREASE_TH))
2014                 scale_action = 0;
2015
2016         switch (scale_action) {
2017         case -1:
2018                 /* Decrease starting rate, update uCode's rate table */
2019                 if (low != IWL_RATE_INVALID) {
2020                         update_lq = 1;
2021                         index = low;
2022                 }
2023                 break;
2024         case 1:
2025                 /* Increase starting rate, update uCode's rate table */
2026                 if (high != IWL_RATE_INVALID) {
2027                         update_lq = 1;
2028                         index = high;
2029                 }
2030
2031                 break;
2032         case 0:
2033                 /* No change */
2034         default:
2035                 break;
2036         }
2037
2038         IWL_DEBUG_HT("choose rate scale index %d action %d low %d "
2039                     "high %d type %d\n",
2040                      index, scale_action, low, high, tbl->lq_type);
2041
2042  lq_update:
2043         /* Replace uCode's rate table for the destination station. */
2044         if (update_lq) {
2045                 rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green);
2046                 rs_fill_link_cmd(lq_sta, &mcs_rate, &lq_sta->lq);
2047                 rs_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2048         }
2049
2050         /* Should we stay with this modulation mode, or search for a new one? */
2051         rs_stay_in_table(lq_sta);
2052
2053         /*
2054          * Search for new modulation mode if we're:
2055          * 1)  Not changing rates right now
2056          * 2)  Not just finishing up a search
2057          * 3)  Allowing a new search
2058          */
2059         if (!update_lq && !done_search && !lq_sta->stay_in_tbl) {
2060                 /* Save current throughput to compare with "search" throughput*/
2061                 lq_sta->last_tpt = current_tpt;
2062
2063                 /* Select a new "search" modulation mode to try.
2064                  * If one is found, set up the new "search" table. */
2065                 if (is_legacy(tbl->lq_type))
2066                         rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2067                 else if (is_siso(tbl->lq_type))
2068                         rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2069                 else
2070                         rs_move_mimo_to_other(priv, lq_sta, conf, sta, index);
2071
2072                 /* If new "search" mode was selected, set up in uCode table */
2073                 if (lq_sta->search_better_tbl) {
2074                         /* Access the "search" table, clear its history. */
2075                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2076                         for (i = 0; i < IWL_RATE_COUNT; i++)
2077                                 rs_rate_scale_clear_window(&(tbl->win[i]));
2078
2079                         /* Use new "search" start rate */
2080                         index = iwl4965_hwrate_to_plcp_idx(
2081                                         tbl->current_rate.rate_n_flags);
2082
2083                         IWL_DEBUG_HT("Switch current  mcs: %X index: %d\n",
2084                                      tbl->current_rate.rate_n_flags, index);
2085                         rs_fill_link_cmd(lq_sta, &tbl->current_rate,
2086                                          &lq_sta->lq);
2087                         rs_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2088                 }
2089
2090                 /* If the "active" (non-search) mode was legacy,
2091                  * and we've tried switching antennas,
2092                  * but we haven't been able to try HT modes (not available),
2093                  * stay with best antenna legacy modulation for a while
2094                  * before next round of mode comparisons. */
2095                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2096                 if (is_legacy(tbl1->lq_type) &&
2097 #ifdef CONFIG_IWL4965_HT
2098                    (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)) &&
2099 #endif
2100                     (lq_sta->action_counter >= 1)) {
2101                         lq_sta->action_counter = 0;
2102                         IWL_DEBUG_HT("LQ: STAY in legacy table\n");
2103                         rs_set_stay_in_table(1, lq_sta);
2104                 }
2105
2106                 /* If we're in an HT mode, and all 3 mode switch actions
2107                  * have been tried and compared, stay in this best modulation
2108                  * mode for a while before next round of mode comparisons. */
2109                 if (lq_sta->enable_counter &&
2110                     (lq_sta->action_counter >= IWL_ACTION_LIMIT)) {
2111 #ifdef CONFIG_IWL4965_HT
2112                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2113                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2114                             (tid != MAX_TID_COUNT)) {
2115                                 IWL_DEBUG_HT("try to aggregate tid %d\n", tid);
2116                                 rs_tl_turn_on_agg(priv, tid, lq_sta, sta);
2117                         }
2118 #endif /*CONFIG_IWL4965_HT */
2119                         lq_sta->action_counter = 0;
2120                         rs_set_stay_in_table(0, lq_sta);
2121                 }
2122
2123         /*
2124          * Else, don't search for a new modulation mode.
2125          * Put new timestamp in stay-in-modulation-mode flush timer if:
2126          * 1)  Not changing rates right now
2127          * 2)  Not just finishing up a search
2128          * 3)  flush timer is empty
2129          */
2130         } else {
2131                 if ((!update_lq) && (!done_search) && (!lq_sta->flush_timer))
2132                         lq_sta->flush_timer = jiffies;
2133         }
2134
2135 out:
2136         rs_mcs_from_tbl(&tbl->current_rate, tbl, index, is_green);
2137         i = index;
2138         sta->last_txrate_idx = i;
2139
2140         /* sta->txrate_idx is an index to A mode rates which start
2141          * at IWL_FIRST_OFDM_RATE
2142          */
2143         if (lq_sta->band == IEEE80211_BAND_5GHZ)
2144                 sta->txrate_idx = i - IWL_FIRST_OFDM_RATE;
2145         else
2146                 sta->txrate_idx = i;
2147
2148         return;
2149 }
2150
2151
2152 static void rs_initialize_lq(struct iwl_priv *priv,
2153                              struct ieee80211_conf *conf,
2154                              struct sta_info *sta)
2155 {
2156         int i;
2157         struct iwl4965_lq_sta *lq_sta;
2158         struct iwl4965_scale_tbl_info *tbl;
2159         u8 active_tbl = 0;
2160         int rate_idx;
2161         u8 use_green = rs_use_green(priv, conf);
2162         struct iwl4965_rate mcs_rate;
2163
2164         if (!sta || !sta->rate_ctrl_priv)
2165                 goto out;
2166
2167         lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
2168         i = sta->last_txrate_idx;
2169
2170         if ((lq_sta->lq.sta_id == 0xff) &&
2171             (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
2172                 goto out;
2173
2174         if (!lq_sta->search_better_tbl)
2175                 active_tbl = lq_sta->active_tbl;
2176         else
2177                 active_tbl = 1 - lq_sta->active_tbl;
2178
2179         tbl = &(lq_sta->lq_info[active_tbl]);
2180
2181         if ((i < 0) || (i >= IWL_RATE_COUNT))
2182                 i = 0;
2183
2184         mcs_rate.rate_n_flags = iwl4965_rates[i].plcp ;
2185         mcs_rate.rate_n_flags |= RATE_MCS_ANT_B_MSK;
2186         mcs_rate.rate_n_flags &= ~RATE_MCS_ANT_A_MSK;
2187
2188         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2189                 mcs_rate.rate_n_flags |= RATE_MCS_CCK_MSK;
2190
2191         tbl->antenna_type = ANT_AUX;
2192         rs_get_tbl_info_from_mcs(&mcs_rate, priv->band, tbl, &rate_idx);
2193         if (!rs_is_ant_connected(priv->valid_antenna, tbl->antenna_type))
2194             rs_toggle_antenna(&mcs_rate, tbl);
2195
2196         rs_mcs_from_tbl(&mcs_rate, tbl, rate_idx, use_green);
2197         tbl->current_rate.rate_n_flags = mcs_rate.rate_n_flags;
2198         rs_get_expected_tpt_table(lq_sta, tbl);
2199         rs_fill_link_cmd(lq_sta, &mcs_rate, &lq_sta->lq);
2200         rs_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2201  out:
2202         return;
2203 }
2204
2205 static void rs_get_rate(void *priv_rate, struct net_device *dev,
2206                         struct ieee80211_supported_band *sband,
2207                         struct sk_buff *skb,
2208                         struct rate_selection *sel)
2209 {
2210
2211         int i;
2212         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2213         struct ieee80211_conf *conf = &local->hw.conf;
2214         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2215         struct sta_info *sta;
2216         u16 fc;
2217         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
2218         struct iwl4965_lq_sta *lq_sta;
2219
2220         IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2221
2222         rcu_read_lock();
2223
2224         sta = sta_info_get(local, hdr->addr1);
2225
2226         /* Send management frames and broadcast/multicast data using lowest
2227          * rate. */
2228         fc = le16_to_cpu(hdr->frame_control);
2229         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1) ||
2230             !sta || !sta->rate_ctrl_priv) {
2231                 sel->rate = rate_lowest(local, sband, sta);
2232                 goto out;
2233         }
2234
2235         lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
2236         i = sta->last_txrate_idx;
2237
2238         if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
2239             !lq_sta->ibss_sta_added) {
2240                 u8 sta_id = iwl4965_hw_find_station(priv, hdr->addr1);
2241                 DECLARE_MAC_BUF(mac);
2242
2243                 if (sta_id == IWL_INVALID_STATION) {
2244                         IWL_DEBUG_RATE("LQ: ADD station %s\n",
2245                                        print_mac(mac, hdr->addr1));
2246                         sta_id = iwl4965_add_station_flags(priv, hdr->addr1,
2247                                                         0, CMD_ASYNC, NULL);
2248                 }
2249                 if ((sta_id != IWL_INVALID_STATION)) {
2250                         lq_sta->lq.sta_id = sta_id;
2251                         lq_sta->lq.rs_table[0].rate_n_flags = 0;
2252                         lq_sta->ibss_sta_added = 1;
2253                         rs_initialize_lq(priv, conf, sta);
2254                 }
2255                 if (!lq_sta->ibss_sta_added)
2256                         goto done;
2257         }
2258
2259 done:
2260         if ((i < 0) || (i > IWL_RATE_COUNT)) {
2261                 sel->rate = rate_lowest(local, sband, sta);
2262                 goto out;
2263         }
2264
2265         sel->rate = &priv->ieee_rates[i];
2266 out:
2267         rcu_read_unlock();
2268 }
2269
2270 static void *rs_alloc_sta(void *priv, gfp_t gfp)
2271 {
2272         struct iwl4965_lq_sta *lq_sta;
2273         int i, j;
2274
2275         IWL_DEBUG_RATE("create station rate scale window\n");
2276
2277         lq_sta = kzalloc(sizeof(struct iwl4965_lq_sta), gfp);
2278
2279         if (lq_sta == NULL)
2280                 return NULL;
2281         lq_sta->lq.sta_id = 0xff;
2282
2283
2284         for (j = 0; j < LQ_SIZE; j++)
2285                 for (i = 0; i < IWL_RATE_COUNT; i++)
2286                         rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
2287
2288         return lq_sta;
2289 }
2290
2291 static void rs_rate_init(void *priv_rate, void *priv_sta,
2292                          struct ieee80211_local *local,
2293                          struct sta_info *sta)
2294 {
2295         int i, j;
2296         struct ieee80211_conf *conf = &local->hw.conf;
2297         struct ieee80211_supported_band *sband;
2298         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
2299         struct iwl4965_lq_sta *lq_sta = priv_sta;
2300
2301         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2302
2303         lq_sta->flush_timer = 0;
2304         lq_sta->supp_rates = sta->supp_rates[sband->band];
2305         sta->txrate_idx = 3;
2306         for (j = 0; j < LQ_SIZE; j++)
2307                 for (i = 0; i < IWL_RATE_COUNT; i++)
2308                         rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
2309
2310         IWL_DEBUG_RATE("rate scale global init\n");
2311         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2312          * the lowest or the highest rate.. Could consider using RSSI from
2313          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2314          * after assoc.. */
2315
2316         lq_sta->ibss_sta_added = 0;
2317         if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
2318                 u8 sta_id = iwl4965_hw_find_station(priv, sta->addr);
2319                 DECLARE_MAC_BUF(mac);
2320
2321                 /* for IBSS the call are from tasklet */
2322                 IWL_DEBUG_HT("LQ: ADD station %s\n",
2323                              print_mac(mac, sta->addr));
2324
2325                 if (sta_id == IWL_INVALID_STATION) {
2326                         IWL_DEBUG_RATE("LQ: ADD station %s\n",
2327                                        print_mac(mac, sta->addr));
2328                         sta_id = iwl4965_add_station_flags(priv, sta->addr,
2329                                                         0, CMD_ASYNC, NULL);
2330                 }
2331                 if ((sta_id != IWL_INVALID_STATION)) {
2332                         lq_sta->lq.sta_id = sta_id;
2333                         lq_sta->lq.rs_table[0].rate_n_flags = 0;
2334                 }
2335                 /* FIXME: this is w/a remove it later */
2336                 priv->assoc_station_added = 1;
2337         }
2338
2339         /* Find highest tx rate supported by hardware and destination station */
2340         for (i = 0; i < sband->n_bitrates; i++)
2341                 if (sta->supp_rates[sband->band] & BIT(i))
2342                         sta->txrate_idx = i;
2343
2344         sta->last_txrate_idx = sta->txrate_idx;
2345         /* WTF is with this bogus comment? A doesn't have cck rates */
2346         /* For MODE_IEEE80211A, cck rates are at end of rate table */
2347         if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
2348                 sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2349
2350         lq_sta->is_dup = 0;
2351         lq_sta->valid_antenna = priv->valid_antenna;
2352         lq_sta->antenna = priv->antenna;
2353         lq_sta->is_green = rs_use_green(priv, conf);
2354         lq_sta->active_rate = priv->active_rate;
2355         lq_sta->active_rate &= ~(0x1000);
2356         lq_sta->active_rate_basic = priv->active_rate_basic;
2357         lq_sta->band = priv->band;
2358 #ifdef CONFIG_IWL4965_HT
2359         /*
2360          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2361          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2362          */
2363         lq_sta->active_siso_rate = (priv->current_ht_config.supp_mcs_set[0] << 1);
2364         lq_sta->active_siso_rate |=
2365                         (priv->current_ht_config.supp_mcs_set[0] & 0x1);
2366         lq_sta->active_siso_rate &= ~((u16)0x2);
2367         lq_sta->active_siso_rate =
2368                         lq_sta->active_siso_rate << IWL_FIRST_OFDM_RATE;
2369
2370         /* Same here */
2371         lq_sta->active_mimo_rate = (priv->current_ht_config.supp_mcs_set[1] << 1);
2372         lq_sta->active_mimo_rate |=
2373                         (priv->current_ht_config.supp_mcs_set[1] & 0x1);
2374         lq_sta->active_mimo_rate &= ~((u16)0x2);
2375         lq_sta->active_mimo_rate =
2376                         lq_sta->active_mimo_rate << IWL_FIRST_OFDM_RATE;
2377         IWL_DEBUG_HT("SISO RATE 0x%X MIMO RATE 0x%X\n",
2378                      lq_sta->active_siso_rate,
2379                      lq_sta->active_mimo_rate);
2380         /* as default allow aggregation for all tids */
2381         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2382 #endif /*CONFIG_IWL4965_HT*/
2383 #ifdef CONFIG_MAC80211_DEBUGFS
2384         lq_sta->drv = priv;
2385 #endif
2386
2387         if (priv->assoc_station_added)
2388                 priv->lq_mngr.lq_ready = 1;
2389
2390         rs_initialize_lq(priv, conf, sta);
2391 }
2392
2393 static void rs_fill_link_cmd(struct iwl4965_lq_sta *lq_sta,
2394                             struct iwl4965_rate *tx_mcs,
2395                             struct iwl4965_link_quality_cmd *lq_cmd)
2396 {
2397         int index = 0;
2398         int rate_idx;
2399         int repeat_rate = 0;
2400         u8 ant_toggle_count = 0;
2401         u8 use_ht_possible = 1;
2402         struct iwl4965_rate new_rate;
2403         struct iwl4965_scale_tbl_info tbl_type = { 0 };
2404
2405         /* Override starting rate (index 0) if needed for debug purposes */
2406         rs_dbgfs_set_mcs(lq_sta, tx_mcs, index);
2407
2408         /* Interpret rate_n_flags */
2409         rs_get_tbl_info_from_mcs(tx_mcs, lq_sta->band,
2410                                   &tbl_type, &rate_idx);
2411
2412         /* How many times should we repeat the initial rate? */
2413         if (is_legacy(tbl_type.lq_type)) {
2414                 ant_toggle_count = 1;
2415                 repeat_rate = IWL_NUMBER_TRY;
2416         } else
2417                 repeat_rate = IWL_HT_NUMBER_TRY;
2418
2419         lq_cmd->general_params.mimo_delimiter =
2420                         is_mimo(tbl_type.lq_type) ? 1 : 0;
2421
2422         /* Fill 1st table entry (index 0) */
2423         lq_cmd->rs_table[index].rate_n_flags =
2424                         cpu_to_le32(tx_mcs->rate_n_flags);
2425         new_rate.rate_n_flags = tx_mcs->rate_n_flags;
2426
2427         if (is_mimo(tbl_type.lq_type) || (tbl_type.antenna_type == ANT_MAIN))
2428                 lq_cmd->general_params.single_stream_ant_msk
2429                         = LINK_QUAL_ANT_A_MSK;
2430         else
2431                 lq_cmd->general_params.single_stream_ant_msk
2432                         = LINK_QUAL_ANT_B_MSK;
2433
2434         index++;
2435         repeat_rate--;
2436
2437         /* Fill rest of rate table */
2438         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2439                 /* Repeat initial/next rate.
2440                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2441                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2442                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2443                         if (is_legacy(tbl_type.lq_type)) {
2444                                 if (ant_toggle_count <
2445                                     NUM_TRY_BEFORE_ANTENNA_TOGGLE)
2446                                         ant_toggle_count++;
2447                                 else {
2448                                         rs_toggle_antenna(&new_rate, &tbl_type);
2449                                         ant_toggle_count = 1;
2450                                 }
2451                         }
2452
2453                         /* Override next rate if needed for debug purposes */
2454                         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2455
2456                         /* Fill next table entry */
2457                         lq_cmd->rs_table[index].rate_n_flags =
2458                                         cpu_to_le32(new_rate.rate_n_flags);
2459                         repeat_rate--;
2460                         index++;
2461                 }
2462
2463                 rs_get_tbl_info_from_mcs(&new_rate, lq_sta->band, &tbl_type,
2464                                                 &rate_idx);
2465
2466                 /* Indicate to uCode which entries might be MIMO.
2467                  * If initial rate was MIMO, this will finally end up
2468                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2469                 if (is_mimo(tbl_type.lq_type))
2470                         lq_cmd->general_params.mimo_delimiter = index;
2471
2472                 /* Get next rate */
2473                 rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2474                                   use_ht_possible, &new_rate);
2475
2476                 /* How many times should we repeat the next rate? */
2477                 if (is_legacy(tbl_type.lq_type)) {
2478                         if (ant_toggle_count < NUM_TRY_BEFORE_ANTENNA_TOGGLE)
2479                                 ant_toggle_count++;
2480                         else {
2481                                 rs_toggle_antenna(&new_rate, &tbl_type);
2482                                 ant_toggle_count = 1;
2483                         }
2484                         repeat_rate = IWL_NUMBER_TRY;
2485                 } else
2486                         repeat_rate = IWL_HT_NUMBER_TRY;
2487
2488                 /* Don't allow HT rates after next pass.
2489                  * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2490                 use_ht_possible = 0;
2491
2492                 /* Override next rate if needed for debug purposes */
2493                 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2494
2495                 /* Fill next table entry */
2496                 lq_cmd->rs_table[index].rate_n_flags =
2497                                 cpu_to_le32(new_rate.rate_n_flags);
2498
2499                 index++;
2500                 repeat_rate--;
2501         }
2502
2503         lq_cmd->general_params.dual_stream_ant_msk = 3;
2504         lq_cmd->agg_params.agg_dis_start_th = 3;
2505         lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
2506 }
2507
2508 static void *rs_alloc(struct ieee80211_local *local)
2509 {
2510         return local->hw.priv;
2511 }
2512 /* rate scale requires free function to be implemented */
2513 static void rs_free(void *priv_rate)
2514 {
2515         return;
2516 }
2517
2518 static void rs_clear(void *priv_rate)
2519 {
2520         struct iwl_priv *priv = (struct iwl_priv *) priv_rate;
2521
2522         IWL_DEBUG_RATE("enter\n");
2523
2524         priv->lq_mngr.lq_ready = 0;
2525
2526         IWL_DEBUG_RATE("leave\n");
2527 }
2528
2529 static void rs_free_sta(void *priv, void *priv_sta)
2530 {
2531         struct iwl4965_lq_sta *lq_sta = priv_sta;
2532
2533         IWL_DEBUG_RATE("enter\n");
2534         kfree(lq_sta);
2535         IWL_DEBUG_RATE("leave\n");
2536 }
2537
2538
2539 #ifdef CONFIG_MAC80211_DEBUGFS
2540 static int open_file_generic(struct inode *inode, struct file *file)
2541 {
2542         file->private_data = inode->i_private;
2543         return 0;
2544 }
2545 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
2546                                 struct iwl4965_rate *mcs, int index)
2547 {
2548         u32 base_rate;
2549
2550         if (lq_sta->band == IEEE80211_BAND_5GHZ)
2551                 base_rate = 0x800D;
2552         else
2553                 base_rate = 0x820A;
2554
2555         if (lq_sta->dbg_fixed.rate_n_flags) {
2556                 if (index < 12)
2557                         mcs->rate_n_flags = lq_sta->dbg_fixed.rate_n_flags;
2558                 else
2559                         mcs->rate_n_flags = base_rate;
2560                 IWL_DEBUG_RATE("Fixed rate ON\n");
2561                 return;
2562         }
2563
2564         IWL_DEBUG_RATE("Fixed rate OFF\n");
2565 }
2566
2567 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2568                         const char __user *user_buf, size_t count, loff_t *ppos)
2569 {
2570         struct iwl4965_lq_sta *lq_sta = file->private_data;
2571         char buf[64];
2572         int buf_size;
2573         u32 parsed_rate;
2574
2575         memset(buf, 0, sizeof(buf));
2576         buf_size = min(count, sizeof(buf) -  1);
2577         if (copy_from_user(buf, user_buf, buf_size))
2578                 return -EFAULT;
2579
2580         if (sscanf(buf, "%x", &parsed_rate) == 1)
2581                 lq_sta->dbg_fixed.rate_n_flags = parsed_rate;
2582         else
2583                 lq_sta->dbg_fixed.rate_n_flags = 0;
2584
2585         lq_sta->active_rate = 0x0FFF;   /* 1 - 54 MBits, includes CCK */
2586         lq_sta->active_siso_rate = 0x1FD0;      /* 6 - 60 MBits, no 9, no CCK */
2587         lq_sta->active_mimo_rate = 0x1FD0;      /* 6 - 60 MBits, no 9, no CCK */
2588
2589         IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2590                 lq_sta->lq.sta_id, lq_sta->dbg_fixed.rate_n_flags);
2591
2592         if (lq_sta->dbg_fixed.rate_n_flags) {
2593                 rs_fill_link_cmd(lq_sta, &lq_sta->dbg_fixed, &lq_sta->lq);
2594                 rs_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2595         }
2596
2597         return count;
2598 }
2599
2600 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2601                         char __user *user_buf, size_t count, loff_t *ppos)
2602 {
2603         char buff[1024];
2604         int desc = 0;
2605         int i = 0;
2606
2607         struct iwl4965_lq_sta *lq_sta = file->private_data;
2608
2609         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2610         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2611                         lq_sta->total_failed, lq_sta->total_success,
2612                         lq_sta->active_rate);
2613         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2614                         lq_sta->dbg_fixed.rate_n_flags);
2615         desc += sprintf(buff+desc, "general:"
2616                 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2617                 lq_sta->lq.general_params.flags,
2618                 lq_sta->lq.general_params.mimo_delimiter,
2619                 lq_sta->lq.general_params.single_stream_ant_msk,
2620                 lq_sta->lq.general_params.dual_stream_ant_msk);
2621
2622         desc += sprintf(buff+desc, "agg:"
2623                         "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2624                         le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2625                         lq_sta->lq.agg_params.agg_dis_start_th,
2626                         lq_sta->lq.agg_params.agg_frame_cnt_limit);
2627
2628         desc += sprintf(buff+desc,
2629                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2630                         lq_sta->lq.general_params.start_rate_index[0],
2631                         lq_sta->lq.general_params.start_rate_index[1],
2632                         lq_sta->lq.general_params.start_rate_index[2],
2633                         lq_sta->lq.general_params.start_rate_index[3]);
2634
2635
2636         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2637                 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
2638                         i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2639
2640         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2641 }
2642
2643 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2644         .write = rs_sta_dbgfs_scale_table_write,
2645         .read = rs_sta_dbgfs_scale_table_read,
2646         .open = open_file_generic,
2647 };
2648 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2649                         char __user *user_buf, size_t count, loff_t *ppos)
2650 {
2651         char buff[1024];
2652         int desc = 0;
2653         int i, j;
2654
2655         struct iwl4965_lq_sta *lq_sta = file->private_data;
2656         for (i = 0; i < LQ_SIZE; i++) {
2657                 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2658                                 "rate=0x%X\n",
2659                                 lq_sta->active_tbl == i?"*":"x",
2660                                 lq_sta->lq_info[i].lq_type,
2661                                 lq_sta->lq_info[i].is_SGI,
2662                                 lq_sta->lq_info[i].is_fat,
2663                                 lq_sta->lq_info[i].is_dup,
2664                                 lq_sta->lq_info[i].current_rate.rate_n_flags);
2665                 for (j = 0; j < IWL_RATE_COUNT; j++) {
2666                         desc += sprintf(buff+desc,
2667                                 "counter=%d success=%d %%=%d\n",
2668                                 lq_sta->lq_info[i].win[j].counter,
2669                                 lq_sta->lq_info[i].win[j].success_counter,
2670                                 lq_sta->lq_info[i].win[j].success_ratio);
2671                 }
2672         }
2673         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2674 }
2675
2676 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2677         .read = rs_sta_dbgfs_stats_table_read,
2678         .open = open_file_generic,
2679 };
2680
2681 static void rs_add_debugfs(void *priv, void *priv_sta,
2682                                         struct dentry *dir)
2683 {
2684         struct iwl4965_lq_sta *lq_sta = priv_sta;
2685         lq_sta->rs_sta_dbgfs_scale_table_file =
2686                 debugfs_create_file("rate_scale_table", 0600, dir,
2687                                 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2688         lq_sta->rs_sta_dbgfs_stats_table_file =
2689                 debugfs_create_file("rate_stats_table", 0600, dir,
2690                         lq_sta, &rs_sta_dbgfs_stats_table_ops);
2691 #ifdef CONFIG_IWL4965_HT
2692         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2693                 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
2694                 &lq_sta->tx_agg_tid_en);
2695 #endif
2696
2697 }
2698
2699 static void rs_remove_debugfs(void *priv, void *priv_sta)
2700 {
2701         struct iwl4965_lq_sta *lq_sta = priv_sta;
2702         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2703         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2704 #ifdef CONFIG_IWL4965_HT
2705         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2706 #endif
2707 }
2708 #endif
2709
2710 static struct rate_control_ops rs_ops = {
2711         .module = NULL,
2712         .name = RS_NAME,
2713         .tx_status = rs_tx_status,
2714         .get_rate = rs_get_rate,
2715         .rate_init = rs_rate_init,
2716         .clear = rs_clear,
2717         .alloc = rs_alloc,
2718         .free = rs_free,
2719         .alloc_sta = rs_alloc_sta,
2720         .free_sta = rs_free_sta,
2721 #ifdef CONFIG_MAC80211_DEBUGFS
2722         .add_sta_debugfs = rs_add_debugfs,
2723         .remove_sta_debugfs = rs_remove_debugfs,
2724 #endif
2725 };
2726
2727 int iwl4965_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id)
2728 {
2729         struct ieee80211_local *local = hw_to_local(hw);
2730         struct iwl_priv *priv = hw->priv;
2731         struct iwl4965_lq_sta *lq_sta;
2732         struct sta_info *sta;
2733         int cnt = 0, i;
2734         u32 samples = 0, success = 0, good = 0;
2735         unsigned long now = jiffies;
2736         u32 max_time = 0;
2737         u8 lq_type, antenna;
2738
2739         rcu_read_lock();
2740
2741         sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
2742         if (!sta || !sta->rate_ctrl_priv) {
2743                 if (sta)
2744                         IWL_DEBUG_RATE("leave - no private rate data!\n");
2745                 else
2746                         IWL_DEBUG_RATE("leave - no station!\n");
2747                 rcu_read_unlock();
2748                 return sprintf(buf, "station %d not found\n", sta_id);
2749         }
2750
2751         lq_sta = (void *)sta->rate_ctrl_priv;
2752
2753         lq_type = lq_sta->lq_info[lq_sta->active_tbl].lq_type;
2754         antenna = lq_sta->lq_info[lq_sta->active_tbl].antenna_type;
2755
2756         if (is_legacy(lq_type))
2757                 i = IWL_RATE_54M_INDEX;
2758         else
2759                 i = IWL_RATE_60M_INDEX;
2760         while (1) {
2761                 u64 mask;
2762                 int j;
2763                 int active = lq_sta->active_tbl;
2764
2765                 cnt +=
2766                     sprintf(&buf[cnt], " %2dMbs: ", iwl4965_rates[i].ieee / 2);
2767
2768                 mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1));
2769                 for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1)
2770                         buf[cnt++] =
2771                                 (lq_sta->lq_info[active].win[i].data & mask)
2772                                 ? '1' : '0';
2773
2774                 samples += lq_sta->lq_info[active].win[i].counter;
2775                 good += lq_sta->lq_info[active].win[i].success_counter;
2776                 success += lq_sta->lq_info[active].win[i].success_counter *
2777                            iwl4965_rates[i].ieee;
2778
2779                 if (lq_sta->lq_info[active].win[i].stamp) {
2780                         int delta =
2781                                    jiffies_to_msecs(now -
2782                                    lq_sta->lq_info[active].win[i].stamp);
2783
2784                         if (delta > max_time)
2785                                 max_time = delta;
2786
2787                         cnt += sprintf(&buf[cnt], "%5dms\n", delta);
2788                 } else
2789                         buf[cnt++] = '\n';
2790
2791                 j = iwl4965_get_prev_ieee_rate(i);
2792                 if (j == i)
2793                         break;
2794                 i = j;
2795         }
2796
2797         /* Display the average rate of all samples taken.
2798          *
2799          * NOTE:  We multiply # of samples by 2 since the IEEE measurement
2800          * added from iwl4965_rates is actually 2X the rate */
2801         if (samples)
2802                 cnt += sprintf(&buf[cnt],
2803                          "\nAverage rate is %3d.%02dMbs over last %4dms\n"
2804                          "%3d%% success (%d good packets over %d tries)\n",
2805                          success / (2 * samples), (success * 5 / samples) % 10,
2806                          max_time, good * 100 / samples, good, samples);
2807         else
2808                 cnt += sprintf(&buf[cnt], "\nAverage rate: 0Mbs\n");
2809
2810         cnt += sprintf(&buf[cnt], "\nrate scale type %d antenna %d "
2811                          "active_search %d rate index %d\n", lq_type, antenna,
2812                          lq_sta->search_better_tbl, sta->last_txrate_idx);
2813
2814         rcu_read_unlock();
2815         return cnt;
2816 }
2817
2818 void iwl4965_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
2819 {
2820         struct iwl_priv *priv = hw->priv;
2821
2822         priv->lq_mngr.lq_ready = 1;
2823 }
2824
2825 void iwl4965_rate_control_register(struct ieee80211_hw *hw)
2826 {
2827         ieee80211_rate_control_register(&rs_ops);
2828 }
2829
2830 void iwl4965_rate_control_unregister(struct ieee80211_hw *hw)
2831 {
2832         ieee80211_rate_control_unregister(&rs_ops);
2833 }
2834