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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2008 Intel Corporation. All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  * Contact Information:
  22  * James P. Ketrenos <ipw2100-admin@linux.intel.com>
  23  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  24  *
  25  *****************************************************************************/
  26 #include <linux/kernel.h>
  27 #include <linux/init.h>
  28 #include <linux/skbuff.h>
  29 #include <linux/wireless.h>
  30 #include <net/mac80211.h>
  31
  32 #include <linux/netdevice.h>
  33 #include <linux/etherdevice.h>
  34 #include <linux/delay.h>
  35
  36 #include <linux/workqueue.h>
  37
  38 #include "../net/mac80211/rate.h"
  39
  40 #include "iwl-4965.h"
  41 #include "iwl-core.h"
  42 #include "iwl-helpers.h"
  43
  44 #define RS_NAME "iwl-4965-rs"
  45
  46 #define NUM_TRY_BEFORE_ANTENNA_TOGGLE 1
  47 #define IWL_NUMBER_TRY      1
  48 #define IWL_HT_NUMBER_TRY   3
  49
  50 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  51 #define IWL_RATE_MIN_FAILURE_TH         6       /* min failures to calc tpt */
  52 #define IWL_RATE_MIN_SUCCESS_TH         8       /* min successes to calc tpt */
  53
  54 /* max time to accum history 2 seconds */
  55 #define IWL_RATE_SCALE_FLUSH_INTVL   (2*HZ)
  56
  57 static u8 rs_ht_to_legacy[] = {
  58         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  59         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  60         IWL_RATE_6M_INDEX,
  61         IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
  62         IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
  63         IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
  64         IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
  65 };
  66
  67 /**
  68  * struct iwl4965_rate_scale_data -- tx success history for one rate
  69  */
  70 struct iwl4965_rate_scale_data {
  71         u64 data;               /* bitmap of successful frames */
  72         s32 success_counter;    /* number of frames successful */
  73         s32 success_ratio;      /* per-cent * 128  */
  74         s32 counter;            /* number of frames attempted */
  75         s32 average_tpt;        /* success ratio * expected throughput */
  76         unsigned long stamp;
  77 };
  78
  79 /**
  80  * struct iwl4965_scale_tbl_info -- tx params and success history for all rates
  81  *
  82  * There are two of these in struct iwl4965_lq_sta,
  83  * one for "active", and one for "search".
  84  */
  85 struct iwl4965_scale_tbl_info {
  86         enum iwl_table_type lq_type;
  87         u8 ant_type;
  88         u8 is_SGI;      /* 1 = short guard interval */
  89         u8 is_fat;      /* 1 = 40 MHz channel width */
  90         u8 is_dup;      /* 1 = duplicated data streams */
  91         u8 action;      /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
  92         s32 *expected_tpt;      /* throughput metrics; expected_tpt_G, etc. */
  93         u32 current_rate;  /* rate_n_flags, uCode API format */
  94         struct iwl4965_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
  95 };
  96
  97 #ifdef CONFIG_IWL4965_HT
  98
  99 struct iwl4965_traffic_load {
 100         unsigned long time_stamp;       /* age of the oldest statistics */
 101         u32 packet_count[TID_QUEUE_MAX_SIZE];   /* packet count in this time
 102                                                  * slice */
 103         u32 total;                      /* total num of packets during the
 104                                          * last TID_MAX_TIME_DIFF */
 105         u8 queue_count;                 /* number of queues that has
 106                                          * been used since the last cleanup */
 107         u8 head;                        /* start of the circular buffer */
 108 };
 109
 110 #endif /* CONFIG_IWL4965_HT */
 111
 112 /**
 113  * struct iwl4965_lq_sta -- driver's rate scaling private structure
 114  *
 115  * Pointer to this gets passed back and forth between driver and mac80211.
 116  */
 117 struct iwl4965_lq_sta {
 118         u8 active_tbl;          /* index of active table, range 0-1 */
 119         u8 enable_counter;      /* indicates HT mode */
 120         u8 stay_in_tbl;         /* 1: disallow, 0: allow search for new mode */
 121         u8 search_better_tbl;   /* 1: currently trying alternate mode */
 122         s32 last_tpt;
 123
 124         /* The following determine when to search for a new mode */
 125         u32 table_count_limit;
 126         u32 max_failure_limit;  /* # failed frames before new search */
 127         u32 max_success_limit;  /* # successful frames before new search */
 128         u32 table_count;
 129         u32 total_failed;       /* total failed frames, any/all rates */
 130         u32 total_success;      /* total successful frames, any/all rates */
 131         u32 flush_timer;        /* time staying in mode before new search */
 132
 133         u8 action_counter;      /* # mode-switch actions tried */
 134         u8 antenna;
 135         u8 valid_antenna;
 136         u8 is_green;
 137         u8 is_dup;
 138         enum ieee80211_band band;
 139         u8 ibss_sta_added;
 140
 141         /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
 142         u32 supp_rates;
 143         u16 active_legacy_rate;
 144         u16 active_siso_rate;
 145         u16 active_mimo2_rate;
 146         u16 active_mimo3_rate;
 147         u16 active_rate_basic;
 148
 149         struct iwl_link_quality_cmd lq;
 150         struct iwl4965_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
 151 #ifdef CONFIG_IWL4965_HT
 152         struct iwl4965_traffic_load load[TID_MAX_LOAD_COUNT];
 153         u8 tx_agg_tid_en;
 154 #endif
 155 #ifdef CONFIG_MAC80211_DEBUGFS
 156         struct dentry *rs_sta_dbgfs_scale_table_file;
 157         struct dentry *rs_sta_dbgfs_stats_table_file;
 158 #ifdef CONFIG_IWL4965_HT
 159         struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
 160 #endif
 161         u32 dbg_fixed_rate;
 162         struct iwl_priv *drv;
 163 #endif
 164 };
 165
 166 static void rs_rate_scale_perform(struct iwl_priv *priv,
 167                                    struct net_device *dev,
 168                                    struct ieee80211_hdr *hdr,
 169                                    struct sta_info *sta);
 170 static void rs_fill_link_cmd(const struct iwl_priv *priv,
 171                              struct iwl4965_lq_sta *lq_sta,
 172                              u32 rate_n_flags,
 173                              struct iwl_link_quality_cmd *tbl);
 174
 175
 176 #ifdef CONFIG_MAC80211_DEBUGFS
 177 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
 178                                         u32 *rate_n_flags, int index);
 179 #else
 180 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
 181                                         u32 *rate_n_flags, int index)
 182 {}
 183 #endif
 184
 185 /*
 186  * Expected throughput metrics for following rates:
 187  * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 188  * "G" is the only table that supports CCK (the first 4 rates).
 189  */
 190 /*FIXME:RS:need to spearate tables for MIMO2/MIMO3*/
 191 static s32 expected_tpt_A[IWL_RATE_COUNT] = {
 192         0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
 193 };
 194
 195 static s32 expected_tpt_G[IWL_RATE_COUNT] = {
 196         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
 197 };
 198
 199 static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
 200         0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
 201 };
 202
 203 static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
 204         0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
 205 };
 206
 207 static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
 208         0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
 209 };
 210
 211 static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
 212         0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
 213 };
 214
 215 static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
 216         0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
 217 };
 218
 219 static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
 220         0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
 221 };
 222
 223 static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
 224         0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
 225 };
 226
 227 static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
 228         0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
 229 };
 230
 231 static inline u8 rs_extract_rate(u32 rate_n_flags)
 232 {
 233         return (u8)(rate_n_flags & 0xFF);
 234 }
 235
 236 static void rs_rate_scale_clear_window(struct iwl4965_rate_scale_data *window)
 237 {
 238         window->data = 0;
 239         window->success_counter = 0;
 240         window->success_ratio = IWL_INVALID_VALUE;
 241         window->counter = 0;
 242         window->average_tpt = IWL_INVALID_VALUE;
 243         window->stamp = 0;
 244 }
 245
 246 #ifdef CONFIG_IWL4965_HT
 247 /*
 248  *      removes the old data from the statistics. All data that is older than
 249  *      TID_MAX_TIME_DIFF, will be deleted.
 250  */
 251 static void rs_tl_rm_old_stats(struct iwl4965_traffic_load *tl, u32 curr_time)
 252 {
 253         /* The oldest age we want to keep */
 254         u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
 255
 256         while (tl->queue_count &&
 257                (tl->time_stamp < oldest_time)) {
 258                 tl->total -= tl->packet_count[tl->head];
 259                 tl->packet_count[tl->head] = 0;
 260                 tl->time_stamp += TID_QUEUE_CELL_SPACING;
 261                 tl->queue_count--;
 262                 tl->head++;
 263                 if (tl->head >= TID_QUEUE_MAX_SIZE)
 264                         tl->head = 0;
 265         }
 266 }
 267
 268 /*
 269  *      increment traffic load value for tid and also remove
 270  *      any old values if passed the certain time period
 271  */
 272 static void rs_tl_add_packet(struct iwl4965_lq_sta *lq_data, u8 tid)
 273 {
 274         u32 curr_time = jiffies_to_msecs(jiffies);
 275         u32 time_diff;
 276         s32 index;
 277         struct iwl4965_traffic_load *tl = NULL;
 278
 279         if (tid >= TID_MAX_LOAD_COUNT)
 280                 return;
 281
 282         tl = &lq_data->load[tid];
 283
 284         curr_time -= curr_time % TID_ROUND_VALUE;
 285
 286         /* Happens only for the first packet. Initialize the data */
 287         if (!(tl->queue_count)) {
 288                 tl->total = 1;
 289                 tl->time_stamp = curr_time;
 290                 tl->queue_count = 1;
 291                 tl->head = 0;
 292                 tl->packet_count[0] = 1;
 293                 return;
 294         }
 295
 296         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 297         index = time_diff / TID_QUEUE_CELL_SPACING;
 298
 299         /* The history is too long: remove data that is older than */
 300         /* TID_MAX_TIME_DIFF */
 301         if (index >= TID_QUEUE_MAX_SIZE)
 302                 rs_tl_rm_old_stats(tl, curr_time);
 303
 304         index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
 305         tl->packet_count[index] = tl->packet_count[index] + 1;
 306         tl->total = tl->total + 1;
 307
 308         if ((index + 1) > tl->queue_count)
 309                 tl->queue_count = index + 1;
 310 }
 311
 312 /*
 313         get the traffic load value for tid
 314 */
 315 static u32 rs_tl_get_load(struct iwl4965_lq_sta *lq_data, u8 tid)
 316 {
 317         u32 curr_time = jiffies_to_msecs(jiffies);
 318         u32 time_diff;
 319         s32 index;
 320         struct iwl4965_traffic_load *tl = NULL;
 321
 322         if (tid >= TID_MAX_LOAD_COUNT)
 323                 return 0;
 324
 325         tl = &(lq_data->load[tid]);
 326
 327         curr_time -= curr_time % TID_ROUND_VALUE;
 328
 329         if (!(tl->queue_count))
 330                 return 0;
 331
 332         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 333         index = time_diff / TID_QUEUE_CELL_SPACING;
 334
 335         /* The history is too long: remove data that is older than */
 336         /* TID_MAX_TIME_DIFF */
 337         if (index >= TID_QUEUE_MAX_SIZE)
 338                 rs_tl_rm_old_stats(tl, curr_time);
 339
 340         return tl->total;
 341 }
 342
 343 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
 344                                 struct iwl4965_lq_sta *lq_data, u8 tid,
 345                                 struct sta_info *sta)
 346 {
 347         unsigned long state;
 348         DECLARE_MAC_BUF(mac);
 349
 350         spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
 351         state = sta->ampdu_mlme.tid_state_tx[tid];
 352         spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
 353
 354         if (state == HT_AGG_STATE_IDLE &&
 355             rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
 356                 IWL_DEBUG_HT("Starting Tx agg: STA: %s tid: %d\n",
 357                                 print_mac(mac, sta->addr), tid);
 358                 ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
 359         }
 360 }
 361
 362 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
 363                                 struct iwl4965_lq_sta *lq_data,
 364                                 struct sta_info *sta)
 365 {
 366         if ((tid < TID_MAX_LOAD_COUNT))
 367                 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 368         else if (tid == IWL_AGG_ALL_TID)
 369                 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
 370                         rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 371 }
 372
 373 #endif /* CONFIG_IWLWIFI_HT */
 374
 375 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 376 {
 377         return (!!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 378                 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 379                 !!(rate_n_flags & RATE_MCS_ANT_C_MSK));
 380 }
 381
 382 /**
 383  * rs_collect_tx_data - Update the success/failure sliding window
 384  *
 385  * We keep a sliding window of the last 62 packets transmitted
 386  * at this rate.  window->data contains the bitmask of successful
 387  * packets.
 388  */
 389 static int rs_collect_tx_data(struct iwl4965_rate_scale_data *windows,
 390                               int scale_index, s32 tpt, int retries,
 391                               int successes)
 392 {
 393         struct iwl4965_rate_scale_data *window = NULL;
 394         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 395         s32 fail_count;
 396
 397         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 398                 return -EINVAL;
 399
 400         /* Select data for current tx bit rate */
 401         window = &(windows[scale_index]);
 402
 403         /*
 404          * Keep track of only the latest 62 tx frame attempts in this rate's
 405          * history window; anything older isn't really relevant any more.
 406          * If we have filled up the sliding window, drop the oldest attempt;
 407          * if the oldest attempt (highest bit in bitmap) shows "success",
 408          * subtract "1" from the success counter (this is the main reason
 409          * we keep these bitmaps!).
 410          */
 411         while (retries > 0) {
 412                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 413
 414                         /* remove earliest */
 415                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 416
 417                         if (window->data & mask) {
 418                                 window->data &= ~mask;
 419                                 window->success_counter--;
 420                         }
 421                 }
 422
 423                 /* Increment frames-attempted counter */
 424                 window->counter++;
 425
 426                 /* Shift bitmap by one frame (throw away oldest history),
 427                  * OR in "1", and increment "success" if this
 428                  * frame was successful. */
 429                 window->data <<= 1;;
 430                 if (successes > 0) {
 431                         window->success_counter++;
 432                         window->data |= 0x1;
 433                         successes--;
 434                 }
 435
 436                 retries--;
 437         }
 438
 439         /* Calculate current success ratio, avoid divide-by-0! */
 440         if (window->counter > 0)
 441                 window->success_ratio = 128 * (100 * window->success_counter)
 442                                         / window->counter;
 443         else
 444                 window->success_ratio = IWL_INVALID_VALUE;
 445
 446         fail_count = window->counter - window->success_counter;
 447
 448         /* Calculate average throughput, if we have enough history. */
 449         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 450             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 451                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 452         else
 453                 window->average_tpt = IWL_INVALID_VALUE;
 454
 455         /* Tag this window as having been updated */
 456         window->stamp = jiffies;
 457
 458         return 0;
 459 }
 460
 461 /*
 462  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
 463  */
 464 /* FIXME:RS:remove this function and put the flags statically in the table */
 465 static u32 rate_n_flags_from_tbl(struct iwl4965_scale_tbl_info *tbl,
 466                                        int index, u8 use_green)
 467 {
 468         u32 rate_n_flags = 0;
 469
 470         if (is_legacy(tbl->lq_type)) {
 471                 rate_n_flags = iwl4965_rates[index].plcp;
 472                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 473                         rate_n_flags |= RATE_MCS_CCK_MSK;
 474
 475         } else if (is_Ht(tbl->lq_type)) {
 476                 if (index > IWL_LAST_OFDM_RATE) {
 477                         IWL_ERROR("invalid HT rate index %d\n", index);
 478                         index = IWL_LAST_OFDM_RATE;
 479                 }
 480                 rate_n_flags = RATE_MCS_HT_MSK;
 481
 482                 if (is_siso(tbl->lq_type))
 483                         rate_n_flags |= iwl4965_rates[index].plcp_siso;
 484                 else if (is_mimo2(tbl->lq_type))
 485                         rate_n_flags |= iwl4965_rates[index].plcp_mimo2;
 486                 else
 487                         rate_n_flags |= iwl4965_rates[index].plcp_mimo3;
 488         } else {
 489                 IWL_ERROR("Invalid tbl->lq_type %d\n", tbl->lq_type);
 490         }
 491
 492         rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
 493                                                      RATE_MCS_ANT_ABC_MSK);
 494
 495         if (is_Ht(tbl->lq_type)) {
 496                 if (tbl->is_fat) {
 497                         if (tbl->is_dup)
 498                                 rate_n_flags |= RATE_MCS_DUP_MSK;
 499                         else
 500                                 rate_n_flags |= RATE_MCS_FAT_MSK;
 501                 }
 502                 if (tbl->is_SGI)
 503                         rate_n_flags |= RATE_MCS_SGI_MSK;
 504
 505                 if (use_green) {
 506                         rate_n_flags |= RATE_MCS_GF_MSK;
 507                         if (is_siso(tbl->lq_type) && tbl->is_SGI) {
 508                                 rate_n_flags &= ~RATE_MCS_SGI_MSK;
 509                                 IWL_ERROR("GF was set with SGI:SISO\n");
 510                         }
 511                 }
 512         }
 513         return rate_n_flags;
 514 }
 515
 516 /*
 517  * Interpret uCode API's rate_n_flags format,
 518  * fill "search" or "active" tx mode table.
 519  */
 520 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
 521                                     enum ieee80211_band band,
 522                                     struct iwl4965_scale_tbl_info *tbl,
 523                                     int *rate_idx)
 524 {
 525         u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
 526         u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
 527         u8 mcs;
 528
 529         *rate_idx = iwl4965_hwrate_to_plcp_idx(rate_n_flags);
 530
 531         if (*rate_idx  == IWL_RATE_INVALID) {
 532                 *rate_idx = -1;
 533                 return -EINVAL;
 534         }
 535         tbl->is_SGI = 0;        /* default legacy setup */
 536         tbl->is_fat = 0;
 537         tbl->is_dup = 0;
 538         tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
 539         tbl->lq_type = LQ_NONE;
 540
 541         /* legacy rate format */
 542         if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
 543                 if (num_of_ant == 1) {
 544                         if (band == IEEE80211_BAND_5GHZ)
 545                                 tbl->lq_type = LQ_A;
 546                         else
 547                                 tbl->lq_type = LQ_G;
 548                 }
 549         /* HT rate format */
 550         } else {
 551                 if (rate_n_flags & RATE_MCS_SGI_MSK)
 552                         tbl->is_SGI = 1;
 553
 554                 if ((rate_n_flags & RATE_MCS_FAT_MSK) ||
 555                     (rate_n_flags & RATE_MCS_DUP_MSK))
 556                         tbl->is_fat = 1;
 557
 558                 if (rate_n_flags & RATE_MCS_DUP_MSK)
 559                         tbl->is_dup = 1;
 560
 561                 mcs = rs_extract_rate(rate_n_flags);
 562
 563                 /* SISO */
 564                 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
 565                         if (num_of_ant == 1)
 566                                 tbl->lq_type = LQ_SISO; /*else NONE*/
 567                 /* MIMO2 */
 568                 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
 569                         if (num_of_ant == 2)
 570                                 tbl->lq_type = LQ_MIMO2;
 571                 /* MIMO3 */
 572                 } else {
 573                         if (num_of_ant == 3)
 574                                 tbl->lq_type = LQ_MIMO3;
 575                 }
 576         }
 577         return 0;
 578 }
 579 /* FIXME:RS: need to toggle also ANT_C, and also AB,AC,BC */
 580 static inline void rs_toggle_antenna(u32 *rate_n_flags,
 581                                      struct iwl4965_scale_tbl_info *tbl)
 582 {
 583         tbl->ant_type ^= ANT_AB;
 584         *rate_n_flags ^= (RATE_MCS_ANT_A_MSK|RATE_MCS_ANT_B_MSK);
 585 }
 586
 587 /* FIXME:RS: in 4965 we don't use greenfield at all */
 588 static inline u8 rs_use_green(struct iwl_priv *priv,
 589                               struct ieee80211_conf *conf)
 590 {
 591 #ifdef CONFIG_IWL4965_HT
 592         return ((conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) &&
 593                 priv->current_ht_config.is_green_field &&
 594                 !priv->current_ht_config.non_GF_STA_present);
 595 #else
 596         return 0;
 597 #endif  /* CONFIG_IWL4965_HT */
 598 }
 599
 600 /**
 601  * rs_get_supported_rates - get the available rates
 602  *
 603  * if management frame or broadcast frame only return
 604  * basic available rates.
 605  *
 606  */
 607 static u16 rs_get_supported_rates(struct iwl4965_lq_sta *lq_sta,
 608                                    struct ieee80211_hdr *hdr,
 609                                    enum iwl_table_type rate_type)
 610 {
 611         if (hdr && is_multicast_ether_addr(hdr->addr1) &&
 612             lq_sta->active_rate_basic)
 613                 return lq_sta->active_rate_basic;
 614
 615         if (is_legacy(rate_type)) {
 616                 return lq_sta->active_legacy_rate;
 617         } else {
 618                 if (is_siso(rate_type))
 619                         return lq_sta->active_siso_rate;
 620                 else if (is_mimo2(rate_type))
 621                         return lq_sta->active_mimo2_rate;
 622                 else
 623                         return lq_sta->active_mimo3_rate;
 624         }
 625 }
 626
 627 static u16 rs_get_adjacent_rate(u8 index, u16 rate_mask, int rate_type)
 628 {
 629         u8 high = IWL_RATE_INVALID;
 630         u8 low = IWL_RATE_INVALID;
 631
 632         /* 802.11A or ht walks to the next literal adjacent rate in
 633          * the rate table */
 634         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 635                 int i;
 636                 u32 mask;
 637
 638                 /* Find the previous rate that is in the rate mask */
 639                 i = index - 1;
 640                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 641                         if (rate_mask & mask) {
 642                                 low = i;
 643                                 break;
 644                         }
 645                 }
 646
 647                 /* Find the next rate that is in the rate mask */
 648                 i = index + 1;
 649                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 650                         if (rate_mask & mask) {
 651                                 high = i;
 652                                 break;
 653                         }
 654                 }
 655
 656                 return (high << 8) | low;
 657         }
 658
 659         low = index;
 660         while (low != IWL_RATE_INVALID) {
 661                 low = iwl4965_rates[low].prev_rs;
 662                 if (low == IWL_RATE_INVALID)
 663                         break;
 664                 if (rate_mask & (1 << low))
 665                         break;
 666                 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
 667         }
 668
 669         high = index;
 670         while (high != IWL_RATE_INVALID) {
 671                 high = iwl4965_rates[high].next_rs;
 672                 if (high == IWL_RATE_INVALID)
 673                         break;
 674                 if (rate_mask & (1 << high))
 675                         break;
 676                 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
 677         }
 678
 679         return (high << 8) | low;
 680 }
 681
 682 static u32 rs_get_lower_rate(struct iwl4965_lq_sta *lq_sta,
 683                              struct iwl4965_scale_tbl_info *tbl, u8 scale_index,
 684                              u8 ht_possible)
 685 {
 686         s32 low;
 687         u16 rate_mask;
 688         u16 high_low;
 689         u8 switch_to_legacy = 0;
 690         u8 is_green = lq_sta->is_green;
 691
 692         /* check if we need to switch from HT to legacy rates.
 693          * assumption is that mandatory rates (1Mbps or 6Mbps)
 694          * are always supported (spec demand) */
 695         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
 696                 switch_to_legacy = 1;
 697                 scale_index = rs_ht_to_legacy[scale_index];
 698                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 699                         tbl->lq_type = LQ_A;
 700                 else
 701                         tbl->lq_type = LQ_G;
 702
 703                 if (num_of_ant(tbl->ant_type > 1))
 704                         tbl->ant_type = ANT_A;/*FIXME:RS*/
 705
 706                 tbl->is_fat = 0;
 707                 tbl->is_SGI = 0;
 708         }
 709
 710         rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
 711
 712         /* Mask with station rate restriction */
 713         if (is_legacy(tbl->lq_type)) {
 714                 /* supp_rates has no CCK bits in A mode */
 715                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 716                         rate_mask  = (u16)(rate_mask &
 717                            (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
 718                 else
 719                         rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
 720         }
 721
 722         /* If we switched from HT to legacy, check current rate */
 723         if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
 724                 low = scale_index;
 725                 goto out;
 726         }
 727
 728         high_low = rs_get_adjacent_rate(scale_index, rate_mask, tbl->lq_type);
 729         low = high_low & 0xff;
 730
 731         if (low == IWL_RATE_INVALID)
 732                 low = scale_index;
 733
 734 out:
 735         return rate_n_flags_from_tbl(tbl, low, is_green);
 736 }
 737
 738 /*
 739  * mac80211 sends us Tx status
 740  */
 741 static void rs_tx_status(void *priv_rate, struct net_device *dev,
 742                          struct sk_buff *skb,
 743                          struct ieee80211_tx_status *tx_resp)
 744 {
 745         int status;
 746         u8 retries;
 747         int rs_index, index = 0;
 748         struct iwl4965_lq_sta *lq_sta;
 749         struct iwl_link_quality_cmd *table;
 750         struct sta_info *sta;
 751         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 752         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
 753         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 754         struct ieee80211_hw *hw = local_to_hw(local);
 755         struct iwl4965_rate_scale_data *window = NULL;
 756         struct iwl4965_rate_scale_data *search_win = NULL;
 757         u32 tx_rate;
 758         struct iwl4965_scale_tbl_info tbl_type;
 759         struct iwl4965_scale_tbl_info *curr_tbl, *search_tbl;
 760         u8 active_index = 0;
 761         u16 fc = le16_to_cpu(hdr->frame_control);
 762         s32 tpt = 0;
 763
 764         IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
 765
 766         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1))
 767                 return;
 768
 769         /* This packet was aggregated but doesn't carry rate scale info */
 770         if ((tx_resp->control.flags & IEEE80211_TXCTL_AMPDU) &&
 771             !(tx_resp->flags & IEEE80211_TX_STATUS_AMPDU))
 772                 return;
 773
 774         retries = tx_resp->retry_count;
 775
 776         if (retries > 15)
 777                 retries = 15;
 778
 779         rcu_read_lock();
 780
 781         sta = sta_info_get(local, hdr->addr1);
 782
 783         if (!sta || !sta->rate_ctrl_priv)
 784                 goto out;
 785
 786
 787         lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
 788
 789         if (!priv->lq_mngr.lq_ready)
 790                 goto out;
 791
 792         if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
 793             !lq_sta->ibss_sta_added)
 794                 goto out;
 795
 796         table = &lq_sta->lq;
 797         active_index = lq_sta->active_tbl;
 798
 799         lq_sta->antenna = lq_sta->valid_antenna;
 800
 801         curr_tbl = &(lq_sta->lq_info[active_index]);
 802         search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
 803         window = (struct iwl4965_rate_scale_data *)
 804             &(curr_tbl->win[0]);
 805         search_win = (struct iwl4965_rate_scale_data *)
 806             &(search_tbl->win[0]);
 807
 808         /*
 809          * Ignore this Tx frame response if its initial rate doesn't match
 810          * that of latest Link Quality command.  There may be stragglers
 811          * from a previous Link Quality command, but we're no longer interested
 812          * in those; they're either from the "active" mode while we're trying
 813          * to check "search" mode, or a prior "search" mode after we've moved
 814          * to a new "search" mode (which might become the new "active" mode).
 815          */
 816         tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
 817         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
 818         if (priv->band == IEEE80211_BAND_5GHZ)
 819                 rs_index -= IWL_FIRST_OFDM_RATE;
 820
 821         if ((tx_resp->control.tx_rate == NULL) ||
 822             (tbl_type.is_SGI ^
 823                 !!(tx_resp->control.flags & IEEE80211_TXCTL_SHORT_GI)) ||
 824             (tbl_type.is_fat ^
 825                 !!(tx_resp->control.flags & IEEE80211_TXCTL_40_MHZ_WIDTH)) ||
 826             (tbl_type.is_dup ^
 827                 !!(tx_resp->control.flags & IEEE80211_TXCTL_DUP_DATA)) ||
 828             (tbl_type.ant_type ^ tx_resp->control.antenna_sel_tx) ||
 829             (!!(tx_rate & RATE_MCS_HT_MSK) ^
 830                 !!(tx_resp->control.flags & IEEE80211_TXCTL_OFDM_HT)) ||
 831             (!!(tx_rate & RATE_MCS_GF_MSK) ^
 832                 !!(tx_resp->control.flags & IEEE80211_TXCTL_GREEN_FIELD)) ||
 833             (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
 834                 tx_resp->control.tx_rate->bitrate)) {
 835                 IWL_DEBUG_RATE("initial rate does not match 0x%x\n", tx_rate);
 836                 goto out;
 837         }
 838
 839         /* Update frame history window with "failure" for each Tx retry. */
 840         while (retries) {
 841                 /* Look up the rate and other info used for each tx attempt.
 842                  * Each tx attempt steps one entry deeper in the rate table. */
 843                 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
 844                 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
 845                                           &tbl_type, &rs_index);
 846
 847                 /* If type matches "search" table,
 848                  * add failure to "search" history */
 849                 if ((tbl_type.lq_type == search_tbl->lq_type) &&
 850                     (tbl_type.ant_type == search_tbl->ant_type) &&
 851                     (tbl_type.is_SGI == search_tbl->is_SGI)) {
 852                         if (search_tbl->expected_tpt)
 853                                 tpt = search_tbl->expected_tpt[rs_index];
 854                         else
 855                                 tpt = 0;
 856                         rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
 857
 858                 /* Else if type matches "current/active" table,
 859                  * add failure to "current/active" history */
 860                 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
 861                            (tbl_type.ant_type == curr_tbl->ant_type) &&
 862                            (tbl_type.is_SGI == curr_tbl->is_SGI)) {
 863                         if (curr_tbl->expected_tpt)
 864                                 tpt = curr_tbl->expected_tpt[rs_index];
 865                         else
 866                                 tpt = 0;
 867                         rs_collect_tx_data(window, rs_index, tpt, 1, 0);
 868                 }
 869
 870                 /* If not searching for a new mode, increment failed counter
 871                  * ... this helps determine when to start searching again */
 872                 if (lq_sta->stay_in_tbl)
 873                         lq_sta->total_failed++;
 874                 --retries;
 875                 index++;
 876
 877         }
 878
 879         /*
 880          * Find (by rate) the history window to update with final Tx attempt;
 881          * if Tx was successful first try, use original rate,
 882          * else look up the rate that was, finally, successful.
 883          */
 884         tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
 885         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
 886
 887         /* Update frame history window with "success" if Tx got ACKed ... */
 888         if (tx_resp->flags & IEEE80211_TX_STATUS_ACK)
 889                 status = 1;
 890         else
 891                 status = 0;
 892
 893         /* If type matches "search" table,
 894          * add final tx status to "search" history */
 895         if ((tbl_type.lq_type == search_tbl->lq_type) &&
 896             (tbl_type.ant_type == search_tbl->ant_type) &&
 897             (tbl_type.is_SGI == search_tbl->is_SGI)) {
 898                 if (search_tbl->expected_tpt)
 899                         tpt = search_tbl->expected_tpt[rs_index];
 900                 else
 901                         tpt = 0;
 902                 if (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU)
 903                         rs_collect_tx_data(search_win, rs_index, tpt,
 904                                            tx_resp->ampdu_ack_len,
 905                                            tx_resp->ampdu_ack_map);
 906                 else
 907                         rs_collect_tx_data(search_win, rs_index, tpt,
 908                                            1, status);
 909         /* Else if type matches "current/active" table,
 910          * add final tx status to "current/active" history */
 911         } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
 912                    (tbl_type.ant_type == curr_tbl->ant_type) &&
 913                    (tbl_type.is_SGI == curr_tbl->is_SGI)) {
 914                 if (curr_tbl->expected_tpt)
 915                         tpt = curr_tbl->expected_tpt[rs_index];
 916                 else
 917                         tpt = 0;
 918                 if (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU)
 919                         rs_collect_tx_data(window, rs_index, tpt,
 920                                            tx_resp->ampdu_ack_len,
 921                                            tx_resp->ampdu_ack_map);
 922                 else
 923                         rs_collect_tx_data(window, rs_index, tpt,
 924                                            1, status);
 925         }
 926
 927         /* If not searching for new mode, increment success/failed counter
 928          * ... these help determine when to start searching again */
 929         if (lq_sta->stay_in_tbl) {
 930                 if (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU) {
 931                         lq_sta->total_success += tx_resp->ampdu_ack_map;
 932                         lq_sta->total_failed +=
 933                              (tx_resp->ampdu_ack_len - tx_resp->ampdu_ack_map);
 934                 } else {
 935                         if (status)
 936                                 lq_sta->total_success++;
 937                         else
 938                                 lq_sta->total_failed++;
 939                 }
 940         }
 941
 942         /* See if there's a better rate or modulation mode to try. */
 943         rs_rate_scale_perform(priv, dev, hdr, sta);
 944 out:
 945         rcu_read_unlock();
 946         return;
 947 }
 948
 949 static inline u8 rs_is_ant_connected(u8 valid_antenna, u8 ant_type)
 950 {
 951         return ((ant_type & valid_antenna) == ant_type);
 952 }
 953
 954 /*FIXME:RS: this function should be replaced*/
 955 static u8 rs_is_other_ant_connected(u8 valid_antenna, u8 ant_type)
 956 {
 957         if (ant_type == ANT_B)
 958                 return rs_is_ant_connected(valid_antenna, ANT_A);
 959         else
 960                 return rs_is_ant_connected(valid_antenna, ANT_B);
 961
 962         return 0;
 963 }
 964
 965 /*
 966  * Begin a period of staying with a selected modulation mode.
 967  * Set "stay_in_tbl" flag to prevent any mode switches.
 968  * Set frame tx success limits according to legacy vs. high-throughput,
 969  * and reset overall (spanning all rates) tx success history statistics.
 970  * These control how long we stay using same modulation mode before
 971  * searching for a new mode.
 972  */
 973 static void rs_set_stay_in_table(u8 is_legacy,
 974                                  struct iwl4965_lq_sta *lq_sta)
 975 {
 976         IWL_DEBUG_RATE("we are staying in the same table\n");
 977         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
 978         if (is_legacy) {
 979                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
 980                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
 981                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
 982         } else {
 983                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
 984                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
 985                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
 986         }
 987         lq_sta->table_count = 0;
 988         lq_sta->total_failed = 0;
 989         lq_sta->total_success = 0;
 990 }
 991
 992 /*
 993  * Find correct throughput table for given mode of modulation
 994  */
 995 static void rs_set_expected_tpt_table(struct iwl4965_lq_sta *lq_sta,
 996                                       struct iwl4965_scale_tbl_info *tbl)
 997 {
 998         if (is_legacy(tbl->lq_type)) {
 999                 if (!is_a_band(tbl->lq_type))
1000                         tbl->expected_tpt = expected_tpt_G;
1001                 else
1002                         tbl->expected_tpt = expected_tpt_A;
1003         } else if (is_siso(tbl->lq_type)) {
1004                 if (tbl->is_fat && !lq_sta->is_dup)
1005                         if (tbl->is_SGI)
1006                                 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
1007                         else
1008                                 tbl->expected_tpt = expected_tpt_siso40MHz;
1009                 else if (tbl->is_SGI)
1010                         tbl->expected_tpt = expected_tpt_siso20MHzSGI;
1011                 else
1012                         tbl->expected_tpt = expected_tpt_siso20MHz;
1013
1014         } else if (is_mimo(tbl->lq_type)) { /* FIXME:need to separate mimo2/3 */
1015                 if (tbl->is_fat && !lq_sta->is_dup)
1016                         if (tbl->is_SGI)
1017                                 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
1018                         else
1019                                 tbl->expected_tpt = expected_tpt_mimo40MHz;
1020                 else if (tbl->is_SGI)
1021                         tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
1022                 else
1023                         tbl->expected_tpt = expected_tpt_mimo20MHz;
1024         } else
1025                 tbl->expected_tpt = expected_tpt_G;
1026 }
1027
1028 #ifdef CONFIG_IWL4965_HT
1029 /*
1030  * Find starting rate for new "search" high-throughput mode of modulation.
1031  * Goal is to find lowest expected rate (under perfect conditions) that is
1032  * above the current measured throughput of "active" mode, to give new mode
1033  * a fair chance to prove itself without too many challenges.
1034  *
1035  * This gets called when transitioning to more aggressive modulation
1036  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1037  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1038  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1039  * bit rate will typically need to increase, but not if performance was bad.
1040  */
1041 static s32 rs_get_best_rate(struct iwl_priv *priv,
1042                             struct iwl4965_lq_sta *lq_sta,
1043                             struct iwl4965_scale_tbl_info *tbl, /* "search" */
1044                             u16 rate_mask, s8 index, s8 rate)
1045 {
1046         /* "active" values */
1047         struct iwl4965_scale_tbl_info *active_tbl =
1048             &(lq_sta->lq_info[lq_sta->active_tbl]);
1049         s32 active_sr = active_tbl->win[index].success_ratio;
1050         s32 active_tpt = active_tbl->expected_tpt[index];
1051
1052         /* expected "search" throughput */
1053         s32 *tpt_tbl = tbl->expected_tpt;
1054
1055         s32 new_rate, high, low, start_hi;
1056         u16 high_low;
1057
1058         new_rate = high = low = start_hi = IWL_RATE_INVALID;
1059
1060         for (; ;) {
1061                 high_low = rs_get_adjacent_rate(rate, rate_mask, tbl->lq_type);
1062
1063                 low = high_low & 0xff;
1064                 high = (high_low >> 8) & 0xff;
1065
1066                 /*
1067                  * Lower the "search" bit rate, to give new "search" mode
1068                  * approximately the same throughput as "active" if:
1069                  *
1070                  * 1) "Active" mode has been working modestly well (but not
1071                  *    great), and expected "search" throughput (under perfect
1072                  *    conditions) at candidate rate is above the actual
1073                  *    measured "active" throughput (but less than expected
1074                  *    "active" throughput under perfect conditions).
1075                  * OR
1076                  * 2) "Active" mode has been working perfectly or very well
1077                  *    and expected "search" throughput (under perfect
1078                  *    conditions) at candidate rate is above expected
1079                  *    "active" throughput (under perfect conditions).
1080                  */
1081                 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1082                      ((active_sr > IWL_RATE_DECREASE_TH) &&
1083                       (active_sr <= IWL_RATE_HIGH_TH) &&
1084                       (tpt_tbl[rate] <= active_tpt))) ||
1085                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1086                      (tpt_tbl[rate] > active_tpt))) {
1087
1088                         /* (2nd or later pass)
1089                          * If we've already tried to raise the rate, and are
1090                          * now trying to lower it, use the higher rate. */
1091                         if (start_hi != IWL_RATE_INVALID) {
1092                                 new_rate = start_hi;
1093                                 break;
1094                         }
1095
1096                         new_rate = rate;
1097
1098                         /* Loop again with lower rate */
1099                         if (low != IWL_RATE_INVALID)
1100                                 rate = low;
1101
1102                         /* Lower rate not available, use the original */
1103                         else
1104                                 break;
1105
1106                 /* Else try to raise the "search" rate to match "active" */
1107                 } else {
1108                         /* (2nd or later pass)
1109                          * If we've already tried to lower the rate, and are
1110                          * now trying to raise it, use the lower rate. */
1111                         if (new_rate != IWL_RATE_INVALID)
1112                                 break;
1113
1114                         /* Loop again with higher rate */
1115                         else if (high != IWL_RATE_INVALID) {
1116                                 start_hi = high;
1117                                 rate = high;
1118
1119                         /* Higher rate not available, use the original */
1120                         } else {
1121                                 new_rate = rate;
1122                                 break;
1123                         }
1124                 }
1125         }
1126
1127         return new_rate;
1128 }
1129 #endif                          /* CONFIG_IWL4965_HT */
1130
1131 /*FIXME:RS:this function should be replaced*/
1132 static inline u8 rs_is_both_ant_supp(u8 valid_antenna)
1133 {
1134         return (rs_is_ant_connected(valid_antenna, ANT_AB));
1135 }
1136
1137 /*
1138  * Set up search table for MIMO
1139  */
1140 #ifdef CONFIG_IWL4965_HT
1141 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1142                              struct iwl4965_lq_sta *lq_sta,
1143                              struct ieee80211_conf *conf,
1144                              struct sta_info *sta,
1145                              struct iwl4965_scale_tbl_info *tbl, int index)
1146 {
1147         u16 rate_mask;
1148         s32 rate;
1149         s8 is_green = lq_sta->is_green;
1150
1151         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1152             !sta->ht_info.ht_supported)
1153                 return -1;
1154
1155         if (priv->current_ht_config.tx_mimo_ps_mode == IWL_MIMO_PS_STATIC)
1156                 return -1;
1157
1158         /* Need both Tx chains/antennas to support MIMO */
1159         if (!rs_is_both_ant_supp(priv->hw_params.valid_tx_ant))
1160                 return -1;
1161
1162         IWL_DEBUG_RATE("LQ: try to switch to MIMO2\n");
1163
1164         tbl->lq_type = LQ_MIMO2;
1165         tbl->is_dup = lq_sta->is_dup;
1166         tbl->action = 0;
1167         rate_mask = lq_sta->active_mimo2_rate;
1168
1169         if (priv->current_ht_config.supported_chan_width
1170                                         == IWL_CHANNEL_WIDTH_40MHZ)
1171                 tbl->is_fat = 1;
1172         else
1173                 tbl->is_fat = 0;
1174
1175         /* FIXME: - don't toggle SGI here
1176         if (tbl->is_fat) {
1177                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1178                         tbl->is_SGI = 1;
1179                 else
1180                         tbl->is_SGI = 0;
1181         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1182                 tbl->is_SGI = 1;
1183         else
1184                 tbl->is_SGI = 0;
1185         */
1186
1187         rs_set_expected_tpt_table(lq_sta, tbl);
1188
1189         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index, index);
1190
1191         IWL_DEBUG_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1192
1193         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1194                 IWL_DEBUG_RATE("Can't switch with index %d rate mask %x\n",
1195                                                 rate, rate_mask);
1196                 return -1;
1197         }
1198         tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1199
1200         IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1201                      tbl->current_rate, is_green);
1202         return 0;
1203 }
1204 #else
1205 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1206                              struct iwl4965_lq_sta *lq_sta,
1207                              struct ieee80211_conf *conf,
1208                              struct sta_info *sta,
1209                              struct iwl4965_scale_tbl_info *tbl, int index)
1210 {
1211         return -1;
1212 }
1213 #endif  /*CONFIG_IWL4965_HT */
1214
1215 /*
1216  * Set up search table for SISO
1217  */
1218 static int rs_switch_to_siso(struct iwl_priv *priv,
1219                              struct iwl4965_lq_sta *lq_sta,
1220                              struct ieee80211_conf *conf,
1221                              struct sta_info *sta,
1222                              struct iwl4965_scale_tbl_info *tbl, int index)
1223 {
1224 #ifdef CONFIG_IWL4965_HT
1225         u16 rate_mask;
1226         u8 is_green = lq_sta->is_green;
1227         s32 rate;
1228
1229         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1230             !sta->ht_info.ht_supported)
1231                 return -1;
1232
1233         IWL_DEBUG_RATE("LQ: try to switch to SISO\n");
1234
1235         tbl->is_dup = lq_sta->is_dup;
1236         tbl->lq_type = LQ_SISO;
1237         tbl->action = 0;
1238         rate_mask = lq_sta->active_siso_rate;
1239
1240         if (priv->current_ht_config.supported_chan_width
1241             == IWL_CHANNEL_WIDTH_40MHZ)
1242                 tbl->is_fat = 1;
1243         else
1244                 tbl->is_fat = 0;
1245
1246         /* FIXME: - don't toggle SGI here
1247         if (tbl->is_fat) {
1248                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1249                         tbl->is_SGI = 1;
1250                 else
1251                         tbl->is_SGI = 0;
1252         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1253                 tbl->is_SGI = 1;
1254         else
1255                 tbl->is_SGI = 0;
1256         */
1257
1258         if (is_green)
1259                 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1260
1261         rs_set_expected_tpt_table(lq_sta, tbl);
1262         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index, index);
1263
1264         IWL_DEBUG_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask);
1265         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1266                 IWL_DEBUG_RATE("can not switch with index %d rate mask %x\n",
1267                              rate, rate_mask);
1268                 return -1;
1269         }
1270         tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1271         IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1272                      tbl->current_rate, is_green);
1273         return 0;
1274 #else
1275         return -1;
1276
1277 #endif  /*CONFIG_IWL4965_HT */
1278 }
1279
1280 /*
1281  * Try to switch to new modulation mode from legacy
1282  */
1283 static int rs_move_legacy_other(struct iwl_priv *priv,
1284                                 struct iwl4965_lq_sta *lq_sta,
1285                                 struct ieee80211_conf *conf,
1286                                 struct sta_info *sta,
1287                                 int index)
1288 {
1289         struct iwl4965_scale_tbl_info *tbl =
1290             &(lq_sta->lq_info[lq_sta->active_tbl]);
1291         struct iwl4965_scale_tbl_info *search_tbl =
1292             &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1293         struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1294         u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1295                   (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1296         u8 start_action = tbl->action;
1297         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1298         int ret = 0;
1299
1300         for (; ;) {
1301                 switch (tbl->action) {
1302                 case IWL_LEGACY_SWITCH_ANTENNA:
1303                         IWL_DEBUG_RATE("LQ Legacy toggle Antenna\n");
1304
1305                         search_tbl->lq_type = LQ_NONE;
1306                         lq_sta->action_counter++;
1307
1308                         /* Don't change antenna if success has been great */
1309                         /*FIXME:RS:not sure this is really needed*/
1310                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1311                                 break;
1312
1313                         /* Don't change antenna if other one is not connected */
1314                         if (!rs_is_other_ant_connected(valid_tx_ant,
1315                                                         tbl->ant_type))
1316                                 break;
1317
1318                         /* Set up search table to try other antenna */
1319                         memcpy(search_tbl, tbl, sz);
1320
1321                         rs_toggle_antenna(&search_tbl->current_rate,
1322                                            search_tbl);
1323                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1324                         lq_sta->search_better_tbl = 1;
1325                         goto out;
1326
1327                 case IWL_LEGACY_SWITCH_SISO:
1328                         IWL_DEBUG_RATE("LQ: Legacy switch to SISO\n");
1329
1330                         /* Set up search table to try SISO */
1331                         memcpy(search_tbl, tbl, sz);
1332                         search_tbl->is_SGI = 0;
1333                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1334                                                  search_tbl, index);
1335                         if (!ret) {
1336                                 lq_sta->search_better_tbl = 1;
1337                                 lq_sta->action_counter = 0;
1338                                 goto out;
1339                         }
1340
1341                         break;
1342                 case IWL_LEGACY_SWITCH_MIMO2:
1343                         IWL_DEBUG_RATE("LQ: Legacy switch to MIMO2\n");
1344
1345                         /* Set up search table to try MIMO */
1346                         memcpy(search_tbl, tbl, sz);
1347                         search_tbl->is_SGI = 0;
1348                         search_tbl->ant_type = ANT_AB;/*FIXME:RS*/
1349                                 /*FIXME:RS:need to check ant validity*/
1350                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1351                                                  search_tbl, index);
1352                         if (!ret) {
1353                                 lq_sta->search_better_tbl = 1;
1354                                 lq_sta->action_counter = 0;
1355                                 goto out;
1356                         }
1357                         break;
1358                 }
1359                 tbl->action++;
1360                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2)
1361                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1362
1363                 if (tbl->action == start_action)
1364                         break;
1365
1366         }
1367         return 0;
1368
1369  out:
1370         tbl->action++;
1371         if (tbl->action > IWL_LEGACY_SWITCH_MIMO2)
1372                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1373         return 0;
1374
1375 }
1376
1377 /*
1378  * Try to switch to new modulation mode from SISO
1379  */
1380 static int rs_move_siso_to_other(struct iwl_priv *priv,
1381                                  struct iwl4965_lq_sta *lq_sta,
1382                                  struct ieee80211_conf *conf,
1383                                  struct sta_info *sta,
1384                                  int index)
1385 {
1386         u8 is_green = lq_sta->is_green;
1387         struct iwl4965_scale_tbl_info *tbl =
1388             &(lq_sta->lq_info[lq_sta->active_tbl]);
1389         struct iwl4965_scale_tbl_info *search_tbl =
1390             &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1391         struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1392         u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1393                   (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1394         u8 start_action = tbl->action;
1395         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1396         int ret;
1397
1398         for (;;) {
1399                 lq_sta->action_counter++;
1400                 switch (tbl->action) {
1401                 case IWL_SISO_SWITCH_ANTENNA:
1402                         IWL_DEBUG_RATE("LQ: SISO toggle Antenna\n");
1403                         /*FIXME:RS: is this really needed for SISO?*/
1404                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1405                                 break;
1406                         if (!rs_is_other_ant_connected(valid_tx_ant,
1407                                                        tbl->ant_type))
1408                                 break;
1409
1410                         memcpy(search_tbl, tbl, sz);
1411                         rs_toggle_antenna(&search_tbl->current_rate,
1412                                            search_tbl);
1413                         lq_sta->search_better_tbl = 1;
1414
1415                         goto out;
1416
1417                 case IWL_SISO_SWITCH_MIMO2:
1418                         IWL_DEBUG_RATE("LQ: SISO switch to MIMO\n");
1419                         memcpy(search_tbl, tbl, sz);
1420                         search_tbl->is_SGI = 0;
1421                         search_tbl->ant_type = ANT_AB; /*FIXME:RS*/
1422                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1423                                                  search_tbl, index);
1424                         if (!ret) {
1425                                 lq_sta->search_better_tbl = 1;
1426                                 goto out;
1427                         }
1428                         break;
1429                 case IWL_SISO_SWITCH_GI:
1430                         IWL_DEBUG_RATE("LQ: SISO toggle SGI/NGI\n");
1431
1432                         memcpy(search_tbl, tbl, sz);
1433                         if (is_green) {
1434                                 if (!tbl->is_SGI)
1435                                         break;
1436                                 else
1437                                         IWL_ERROR("SGI was set in GF+SISO\n");
1438                         }
1439                         search_tbl->is_SGI = !tbl->is_SGI;
1440                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1441                         if (tbl->is_SGI) {
1442                                 s32 tpt = lq_sta->last_tpt / 100;
1443                                 if (tpt >= search_tbl->expected_tpt[index])
1444                                         break;
1445                         }
1446                         search_tbl->current_rate = rate_n_flags_from_tbl(
1447                                                 search_tbl, index, is_green);
1448                         lq_sta->search_better_tbl = 1;
1449                         goto out;
1450                 }
1451                 tbl->action++;
1452                 if (tbl->action > IWL_SISO_SWITCH_GI)
1453                         tbl->action = IWL_SISO_SWITCH_ANTENNA;
1454
1455                 if (tbl->action == start_action)
1456                         break;
1457         }
1458         return 0;
1459
1460  out:
1461         tbl->action++;
1462         if (tbl->action > IWL_SISO_SWITCH_GI)
1463                 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1464         return 0;
1465 }
1466
1467 /*
1468  * Try to switch to new modulation mode from MIMO
1469  */
1470 static int rs_move_mimo_to_other(struct iwl_priv *priv,
1471                                  struct iwl4965_lq_sta *lq_sta,
1472                                  struct ieee80211_conf *conf,
1473                                  struct sta_info *sta,
1474                                  int index)
1475 {
1476         int ret;
1477         s8 is_green = lq_sta->is_green;
1478         struct iwl4965_scale_tbl_info *tbl =
1479             &(lq_sta->lq_info[lq_sta->active_tbl]);
1480         struct iwl4965_scale_tbl_info *search_tbl =
1481             &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1482         u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1483                   (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1484         u8 start_action = tbl->action;
1485
1486         for (;;) {
1487                 lq_sta->action_counter++;
1488                 switch (tbl->action) {
1489                 case IWL_MIMO_SWITCH_ANTENNA_A:
1490                 case IWL_MIMO_SWITCH_ANTENNA_B:
1491                         IWL_DEBUG_RATE("LQ: MIMO2 switch to SISO\n");
1492
1493                         /* Set up new search table for SISO */
1494                         memcpy(search_tbl, tbl, sz);
1495
1496                         /*FIXME:RS:need to check ant validity + C*/
1497                         if (tbl->action == IWL_MIMO_SWITCH_ANTENNA_A)
1498                                 search_tbl->ant_type = ANT_A;
1499                         else
1500                                 search_tbl->ant_type = ANT_B;
1501
1502                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1503                                                  search_tbl, index);
1504                         if (!ret) {
1505                                 lq_sta->search_better_tbl = 1;
1506                                 goto out;
1507                         }
1508                         break;
1509
1510                 case IWL_MIMO_SWITCH_GI:
1511                         IWL_DEBUG_RATE("LQ: MIMO toggle SGI/NGI\n");
1512
1513                         /* Set up new search table for MIMO */
1514                         memcpy(search_tbl, tbl, sz);
1515                         search_tbl->is_SGI = !tbl->is_SGI;
1516                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1517                         /*
1518                          * If active table already uses the fastest possible
1519                          * modulation (dual stream with short guard interval),
1520                          * and it's working well, there's no need to look
1521                          * for a better type of modulation!
1522                          */
1523                         if (tbl->is_SGI) {
1524                                 s32 tpt = lq_sta->last_tpt / 100;
1525                                 if (tpt >= search_tbl->expected_tpt[index])
1526                                         break;
1527                         }
1528                         search_tbl->current_rate = rate_n_flags_from_tbl(
1529                                                 search_tbl, index, is_green);
1530                         lq_sta->search_better_tbl = 1;
1531                         goto out;
1532
1533                 }
1534                 tbl->action++;
1535                 if (tbl->action > IWL_MIMO_SWITCH_GI)
1536                         tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1537
1538                 if (tbl->action == start_action)
1539                         break;
1540         }
1541
1542         return 0;
1543  out:
1544         tbl->action++;
1545         if (tbl->action > IWL_MIMO_SWITCH_GI)
1546                 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1547         return 0;
1548
1549 }
1550
1551 /*
1552  * Check whether we should continue using same modulation mode, or
1553  * begin search for a new mode, based on:
1554  * 1) # tx successes or failures while using this mode
1555  * 2) # times calling this function
1556  * 3) elapsed time in this mode (not used, for now)
1557  */
1558 static void rs_stay_in_table(struct iwl4965_lq_sta *lq_sta)
1559 {
1560         struct iwl4965_scale_tbl_info *tbl;
1561         int i;
1562         int active_tbl;
1563         int flush_interval_passed = 0;
1564
1565         active_tbl = lq_sta->active_tbl;
1566
1567         tbl = &(lq_sta->lq_info[active_tbl]);
1568
1569         /* If we've been disallowing search, see if we should now allow it */
1570         if (lq_sta->stay_in_tbl) {
1571
1572                 /* Elapsed time using current modulation mode */
1573                 if (lq_sta->flush_timer)
1574                         flush_interval_passed =
1575                             time_after(jiffies,
1576                                        (unsigned long)(lq_sta->flush_timer +
1577                                         IWL_RATE_SCALE_FLUSH_INTVL));
1578
1579                 /* For now, disable the elapsed time criterion */
1580                 flush_interval_passed = 0;
1581
1582                 /*
1583                  * Check if we should allow search for new modulation mode.
1584                  * If many frames have failed or succeeded, or we've used
1585                  * this same modulation for a long time, allow search, and
1586                  * reset history stats that keep track of whether we should
1587                  * allow a new search.  Also (below) reset all bitmaps and
1588                  * stats in active history.
1589                  */
1590                 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1591                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1592                     ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1593                      && (flush_interval_passed))) {
1594                         IWL_DEBUG_RATE("LQ: stay is expired %d %d %d\n:",
1595                                      lq_sta->total_failed,
1596                                      lq_sta->total_success,
1597                                      flush_interval_passed);
1598
1599                         /* Allow search for new mode */
1600                         lq_sta->stay_in_tbl = 0;        /* only place reset */
1601                         lq_sta->total_failed = 0;
1602                         lq_sta->total_success = 0;
1603                         lq_sta->flush_timer = 0;
1604
1605                 /*
1606                  * Else if we've used this modulation mode enough repetitions
1607                  * (regardless of elapsed time or success/failure), reset
1608                  * history bitmaps and rate-specific stats for all rates in
1609                  * active table.
1610                  */
1611                 } else {
1612                         lq_sta->table_count++;
1613                         if (lq_sta->table_count >=
1614                             lq_sta->table_count_limit) {
1615                                 lq_sta->table_count = 0;
1616
1617                                 IWL_DEBUG_RATE("LQ: stay in table clear win\n");
1618                                 for (i = 0; i < IWL_RATE_COUNT; i++)
1619                                         rs_rate_scale_clear_window(
1620                                                 &(tbl->win[i]));
1621                         }
1622                 }
1623
1624                 /* If transitioning to allow "search", reset all history
1625                  * bitmaps and stats in active table (this will become the new
1626                  * "search" table). */
1627                 if (!lq_sta->stay_in_tbl) {
1628                         for (i = 0; i < IWL_RATE_COUNT; i++)
1629                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1630                 }
1631         }
1632 }
1633
1634 /*
1635  * Do rate scaling and search for new modulation mode.
1636  */
1637 static void rs_rate_scale_perform(struct iwl_priv *priv,
1638                                   struct net_device *dev,
1639                                   struct ieee80211_hdr *hdr,
1640                                   struct sta_info *sta)
1641 {
1642         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1643         struct ieee80211_hw *hw = local_to_hw(local);
1644         struct ieee80211_conf *conf = &hw->conf;
1645         int low = IWL_RATE_INVALID;
1646         int high = IWL_RATE_INVALID;
1647         int index;
1648         int i;
1649         struct iwl4965_rate_scale_data *window = NULL;
1650         int current_tpt = IWL_INVALID_VALUE;
1651         int low_tpt = IWL_INVALID_VALUE;
1652         int high_tpt = IWL_INVALID_VALUE;
1653         u32 fail_count;
1654         s8 scale_action = 0;
1655         u16 fc, rate_mask;
1656         u8 update_lq = 0;
1657         struct iwl4965_lq_sta *lq_sta;
1658         struct iwl4965_scale_tbl_info *tbl, *tbl1;
1659         u16 rate_scale_index_msk = 0;
1660         u32 rate;
1661         u8 is_green = 0;
1662         u8 active_tbl = 0;
1663         u8 done_search = 0;
1664         u16 high_low;
1665 #ifdef CONFIG_IWL4965_HT
1666         u8 tid = MAX_TID_COUNT;
1667         __le16 *qc;
1668 #endif
1669
1670         IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1671
1672         fc = le16_to_cpu(hdr->frame_control);
1673         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
1674                 /* Send management frames and broadcast/multicast data using
1675                  * lowest rate. */
1676                 /* TODO: this could probably be improved.. */
1677                 return;
1678         }
1679
1680         if (!sta || !sta->rate_ctrl_priv)
1681                 return;
1682
1683         if (!priv->lq_mngr.lq_ready) {
1684                 IWL_DEBUG_RATE("still rate scaling not ready\n");
1685                 return;
1686         }
1687         lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
1688
1689 #ifdef CONFIG_IWL4965_HT
1690         qc = ieee80211_get_qos_ctrl(hdr);
1691         if (qc) {
1692                 tid = (u8)(le16_to_cpu(*qc) & 0xf);
1693                 rs_tl_add_packet(lq_sta, tid);
1694         }
1695 #endif
1696         /*
1697          * Select rate-scale / modulation-mode table to work with in
1698          * the rest of this function:  "search" if searching for better
1699          * modulation mode, or "active" if doing rate scaling within a mode.
1700          */
1701         if (!lq_sta->search_better_tbl)
1702                 active_tbl = lq_sta->active_tbl;
1703         else
1704                 active_tbl = 1 - lq_sta->active_tbl;
1705
1706         tbl = &(lq_sta->lq_info[active_tbl]);
1707         is_green = lq_sta->is_green;
1708
1709         /* current tx rate */
1710         index = sta->last_txrate_idx;
1711
1712         IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1713                        tbl->lq_type);
1714
1715         /* rates available for this association, and for modulation mode */
1716         rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
1717
1718         IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1719
1720         /* mask with station rate restriction */
1721         if (is_legacy(tbl->lq_type)) {
1722                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1723                         /* supp_rates has no CCK bits in A mode */
1724                         rate_scale_index_msk = (u16) (rate_mask &
1725                                 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1726                 else
1727                         rate_scale_index_msk = (u16) (rate_mask &
1728                                                       lq_sta->supp_rates);
1729
1730         } else
1731                 rate_scale_index_msk = rate_mask;
1732
1733         if (!rate_scale_index_msk)
1734                 rate_scale_index_msk = rate_mask;
1735
1736         /* If current rate is no longer supported on current association,
1737          * or user changed preferences for rates, find a new supported rate. */
1738         if (index < 0 || !((1 << index) & rate_scale_index_msk)) {
1739                 index = IWL_INVALID_VALUE;
1740                 update_lq = 1;
1741
1742                 /* get the highest available rate */
1743                 for (i = 0; i <= IWL_RATE_COUNT; i++) {
1744                         if ((1 << i) & rate_scale_index_msk)
1745                                 index = i;
1746                 }
1747
1748                 if (index == IWL_INVALID_VALUE) {
1749                         IWL_WARNING("Can not find a suitable rate\n");
1750                         return;
1751                 }
1752         }
1753
1754         /* Get expected throughput table and history window for current rate */
1755         if (!tbl->expected_tpt)
1756                 rs_set_expected_tpt_table(lq_sta, tbl);
1757
1758         window = &(tbl->win[index]);
1759
1760         /*
1761          * If there is not enough history to calculate actual average
1762          * throughput, keep analyzing results of more tx frames, without
1763          * changing rate or mode (bypass most of the rest of this function).
1764          * Set up new rate table in uCode only if old rate is not supported
1765          * in current association (use new rate found above).
1766          */
1767         fail_count = window->counter - window->success_counter;
1768         if (((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1769              (window->success_counter < IWL_RATE_MIN_SUCCESS_TH))
1770             || (tbl->expected_tpt == NULL)) {
1771                 IWL_DEBUG_RATE("LQ: still below TH succ %d total %d "
1772                                "for index %d\n",
1773                                window->success_counter, window->counter, index);
1774
1775                 /* Can't calculate this yet; not enough history */
1776                 window->average_tpt = IWL_INVALID_VALUE;
1777
1778                 /* Should we stay with this modulation mode,
1779                  * or search for a new one? */
1780                 rs_stay_in_table(lq_sta);
1781
1782                 /* Set up new rate table in uCode, if needed */
1783                 if (update_lq) {
1784                         rate = rate_n_flags_from_tbl(tbl, index, is_green);
1785                         rs_fill_link_cmd(priv, lq_sta, rate, &lq_sta->lq);
1786                         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1787                 }
1788                 goto out;
1789
1790         /* Else we have enough samples; calculate estimate of
1791          * actual average throughput */
1792         } else
1793                 window->average_tpt = ((window->success_ratio *
1794                                         tbl->expected_tpt[index] + 64) / 128);
1795
1796         /* If we are searching for better modulation mode, check success. */
1797         if (lq_sta->search_better_tbl) {
1798                 int success_limit = IWL_RATE_SCALE_SWITCH;
1799
1800                 /* If good success, continue using the "search" mode;
1801                  * no need to send new link quality command, since we're
1802                  * continuing to use the setup that we've been trying. */
1803                 if ((window->success_ratio > success_limit) ||
1804                     (window->average_tpt > lq_sta->last_tpt)) {
1805                         if (!is_legacy(tbl->lq_type)) {
1806                                 IWL_DEBUG_RATE("LQ: we are switching to HT"
1807                                              " rate suc %d current tpt %d"
1808                                              " old tpt %d\n",
1809                                              window->success_ratio,
1810                                              window->average_tpt,
1811                                              lq_sta->last_tpt);
1812                                 lq_sta->enable_counter = 1;
1813                         }
1814                         /* Swap tables; "search" becomes "active" */
1815                         lq_sta->active_tbl = active_tbl;
1816                         current_tpt = window->average_tpt;
1817
1818                 /* Else poor success; go back to mode in "active" table */
1819                 } else {
1820                         /* Nullify "search" table */
1821                         tbl->lq_type = LQ_NONE;
1822
1823                         /* Revert to "active" table */
1824                         active_tbl = lq_sta->active_tbl;
1825                         tbl = &(lq_sta->lq_info[active_tbl]);
1826
1827                         /* Revert to "active" rate and throughput info */
1828                         index = iwl4965_hwrate_to_plcp_idx(
1829                                                         tbl->current_rate);
1830                         current_tpt = lq_sta->last_tpt;
1831
1832                         /* Need to set up a new rate table in uCode */
1833                         update_lq = 1;
1834                         IWL_DEBUG_RATE("XXY GO BACK TO OLD TABLE\n");
1835                 }
1836
1837                 /* Either way, we've made a decision; modulation mode
1838                  * search is done, allow rate adjustment next time. */
1839                 lq_sta->search_better_tbl = 0;
1840                 done_search = 1;        /* Don't switch modes below! */
1841                 goto lq_update;
1842         }
1843
1844         /* (Else) not in search of better modulation mode, try for better
1845          * starting rate, while staying in this mode. */
1846         high_low = rs_get_adjacent_rate(index, rate_scale_index_msk,
1847                                         tbl->lq_type);
1848         low = high_low & 0xff;
1849         high = (high_low >> 8) & 0xff;
1850
1851         /* Collect measured throughputs for current and adjacent rates */
1852         current_tpt = window->average_tpt;
1853         if (low != IWL_RATE_INVALID)
1854                 low_tpt = tbl->win[low].average_tpt;
1855         if (high != IWL_RATE_INVALID)
1856                 high_tpt = tbl->win[high].average_tpt;
1857
1858         /* Assume rate increase */
1859         scale_action = 1;
1860
1861         /* Too many failures, decrease rate */
1862         if ((window->success_ratio <= IWL_RATE_DECREASE_TH) ||
1863             (current_tpt == 0)) {
1864                 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1865                 scale_action = -1;
1866
1867         /* No throughput measured yet for adjacent rates; try increase. */
1868         } else if ((low_tpt == IWL_INVALID_VALUE) &&
1869                    (high_tpt == IWL_INVALID_VALUE))
1870                 scale_action = 1;
1871
1872         /* Both adjacent throughputs are measured, but neither one has better
1873          * throughput; we're using the best rate, don't change it! */
1874         else if ((low_tpt != IWL_INVALID_VALUE) &&
1875                  (high_tpt != IWL_INVALID_VALUE) &&
1876                  (low_tpt < current_tpt) &&
1877                  (high_tpt < current_tpt))
1878                 scale_action = 0;
1879
1880         /* At least one adjacent rate's throughput is measured,
1881          * and may have better performance. */
1882         else {
1883                 /* Higher adjacent rate's throughput is measured */
1884                 if (high_tpt != IWL_INVALID_VALUE) {
1885                         /* Higher rate has better throughput */
1886                         if (high_tpt > current_tpt)
1887                                 scale_action = 1;
1888                         else {
1889                                 IWL_DEBUG_RATE
1890                                     ("decrease rate because of high tpt\n");
1891                                 scale_action = -1;
1892                         }
1893
1894                 /* Lower adjacent rate's throughput is measured */
1895                 } else if (low_tpt != IWL_INVALID_VALUE) {
1896                         /* Lower rate has better throughput */
1897                         if (low_tpt > current_tpt) {
1898                                 IWL_DEBUG_RATE
1899                                     ("decrease rate because of low tpt\n");
1900                                 scale_action = -1;
1901                         } else
1902                                 scale_action = 1;
1903                 }
1904         }
1905
1906         /* Sanity check; asked for decrease, but success rate or throughput
1907          * has been good at old rate.  Don't change it. */
1908         if (scale_action == -1) {
1909                 if ((low != IWL_RATE_INVALID) &&
1910                     ((window->success_ratio > IWL_RATE_HIGH_TH) ||
1911                      (current_tpt > (100 * tbl->expected_tpt[low]))))
1912                         scale_action = 0;
1913
1914         /* Sanity check; asked for increase, but success rate has not been great
1915          * even at old rate, higher rate will be worse.  Don't change it. */
1916         } else if ((scale_action == 1) &&
1917                    (window->success_ratio < IWL_RATE_INCREASE_TH))
1918                 scale_action = 0;
1919
1920         switch (scale_action) {
1921         case -1:
1922                 /* Decrease starting rate, update uCode's rate table */
1923                 if (low != IWL_RATE_INVALID) {
1924                         update_lq = 1;
1925                         index = low;
1926                 }
1927                 break;
1928         case 1:
1929                 /* Increase starting rate, update uCode's rate table */
1930                 if (high != IWL_RATE_INVALID) {
1931                         update_lq = 1;
1932                         index = high;
1933                 }
1934
1935                 break;
1936         case 0:
1937                 /* No change */
1938         default:
1939                 break;
1940         }
1941
1942         IWL_DEBUG_RATE("choose rate scale index %d action %d low %d "
1943                     "high %d type %d\n",
1944                      index, scale_action, low, high, tbl->lq_type);
1945
1946  lq_update:
1947         /* Replace uCode's rate table for the destination station. */
1948         if (update_lq) {
1949                 rate = rate_n_flags_from_tbl(tbl, index, is_green);
1950                 rs_fill_link_cmd(priv, lq_sta, rate, &lq_sta->lq);
1951                 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1952         }
1953
1954         /* Should we stay with this modulation mode, or search for a new one? */
1955         rs_stay_in_table(lq_sta);
1956
1957         /*
1958          * Search for new modulation mode if we're:
1959          * 1)  Not changing rates right now
1960          * 2)  Not just finishing up a search
1961          * 3)  Allowing a new search
1962          */
1963         if (!update_lq && !done_search && !lq_sta->stay_in_tbl) {
1964                 /* Save current throughput to compare with "search" throughput*/
1965                 lq_sta->last_tpt = current_tpt;
1966
1967                 /* Select a new "search" modulation mode to try.
1968                  * If one is found, set up the new "search" table. */
1969                 if (is_legacy(tbl->lq_type))
1970                         rs_move_legacy_other(priv, lq_sta, conf, sta, index);
1971                 else if (is_siso(tbl->lq_type))
1972                         rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
1973                 else
1974                         rs_move_mimo_to_other(priv, lq_sta, conf, sta, index);
1975
1976                 /* If new "search" mode was selected, set up in uCode table */
1977                 if (lq_sta->search_better_tbl) {
1978                         /* Access the "search" table, clear its history. */
1979                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1980                         for (i = 0; i < IWL_RATE_COUNT; i++)
1981                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1982
1983                         /* Use new "search" start rate */
1984                         index = iwl4965_hwrate_to_plcp_idx(
1985                                                         tbl->current_rate);
1986
1987                         IWL_DEBUG_RATE("Switch current  mcs: %X index: %d\n",
1988                                      tbl->current_rate, index);
1989                         rs_fill_link_cmd(priv, lq_sta, tbl->current_rate,
1990                                          &lq_sta->lq);
1991                         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1992                 }
1993
1994                 /* If the "active" (non-search) mode was legacy,
1995                  * and we've tried switching antennas,
1996                  * but we haven't been able to try HT modes (not available),
1997                  * stay with best antenna legacy modulation for a while
1998                  * before next round of mode comparisons. */
1999                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2000                 if (is_legacy(tbl1->lq_type) &&
2001 #ifdef CONFIG_IWL4965_HT
2002                    (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)) &&
2003 #endif
2004                     (lq_sta->action_counter >= 1)) {
2005                         lq_sta->action_counter = 0;
2006                         IWL_DEBUG_RATE("LQ: STAY in legacy table\n");
2007                         rs_set_stay_in_table(1, lq_sta);
2008                 }
2009
2010                 /* If we're in an HT mode, and all 3 mode switch actions
2011                  * have been tried and compared, stay in this best modulation
2012                  * mode for a while before next round of mode comparisons. */
2013                 if (lq_sta->enable_counter &&
2014                     (lq_sta->action_counter >= IWL_ACTION_LIMIT)) {
2015 #ifdef CONFIG_IWL4965_HT
2016                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2017                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2018                             (tid != MAX_TID_COUNT)) {
2019                                 IWL_DEBUG_RATE("try to aggregate tid %d\n", tid);
2020                                 rs_tl_turn_on_agg(priv, tid, lq_sta, sta);
2021                         }
2022 #endif /*CONFIG_IWL4965_HT */
2023                         lq_sta->action_counter = 0;
2024                         rs_set_stay_in_table(0, lq_sta);
2025                 }
2026
2027         /*
2028          * Else, don't search for a new modulation mode.
2029          * Put new timestamp in stay-in-modulation-mode flush timer if:
2030          * 1)  Not changing rates right now
2031          * 2)  Not just finishing up a search
2032          * 3)  flush timer is empty
2033          */
2034         } else {
2035                 if ((!update_lq) && (!done_search) && (!lq_sta->flush_timer))
2036                         lq_sta->flush_timer = jiffies;
2037         }
2038
2039 out:
2040         tbl->current_rate = rate_n_flags_from_tbl(tbl, index, is_green);
2041         i = index;
2042         sta->last_txrate_idx = i;
2043
2044         /* sta->txrate_idx is an index to A mode rates which start
2045          * at IWL_FIRST_OFDM_RATE
2046          */
2047         if (lq_sta->band == IEEE80211_BAND_5GHZ)
2048                 sta->txrate_idx = i - IWL_FIRST_OFDM_RATE;
2049         else
2050                 sta->txrate_idx = i;
2051
2052         return;
2053 }
2054
2055
2056 static void rs_initialize_lq(struct iwl_priv *priv,
2057                              struct ieee80211_conf *conf,
2058                              struct sta_info *sta)
2059 {
2060         int i;
2061         struct iwl4965_lq_sta *lq_sta;
2062         struct iwl4965_scale_tbl_info *tbl;
2063         u8 active_tbl = 0;
2064         int rate_idx;
2065         u8 use_green = rs_use_green(priv, conf);
2066         u32 rate;
2067
2068         if (!sta || !sta->rate_ctrl_priv)
2069                 goto out;
2070
2071         lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
2072         i = sta->last_txrate_idx;
2073
2074         if ((lq_sta->lq.sta_id == 0xff) &&
2075             (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
2076                 goto out;
2077
2078         if (!lq_sta->search_better_tbl)
2079                 active_tbl = lq_sta->active_tbl;
2080         else
2081                 active_tbl = 1 - lq_sta->active_tbl;
2082
2083         tbl = &(lq_sta->lq_info[active_tbl]);
2084
2085         if ((i < 0) || (i >= IWL_RATE_COUNT))
2086                 i = 0;
2087
2088         /* FIXME:RS: This is also wrong in 4965 */
2089         rate = iwl4965_rates[i].plcp;
2090         rate |= RATE_MCS_ANT_B_MSK;
2091         rate &= ~RATE_MCS_ANT_A_MSK;
2092
2093         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2094                 rate |= RATE_MCS_CCK_MSK;
2095
2096         tbl->ant_type = ANT_B;
2097         rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2098         if (!rs_is_ant_connected(priv->hw_params.valid_tx_ant, tbl->ant_type))
2099             rs_toggle_antenna(&rate, tbl);
2100
2101         rate = rate_n_flags_from_tbl(tbl, rate_idx, use_green);
2102         tbl->current_rate = rate;
2103         rs_set_expected_tpt_table(lq_sta, tbl);
2104         rs_fill_link_cmd(NULL, lq_sta, rate, &lq_sta->lq);
2105         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2106  out:
2107         return;
2108 }
2109
2110 static void rs_get_rate(void *priv_rate, struct net_device *dev,
2111                         struct ieee80211_supported_band *sband,
2112                         struct sk_buff *skb,
2113                         struct rate_selection *sel)
2114 {
2115
2116         int i;
2117         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2118         struct ieee80211_conf *conf = &local->hw.conf;
2119         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2120         struct sta_info *sta;
2121         u16 fc;
2122         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
2123         struct iwl4965_lq_sta *lq_sta;
2124
2125         IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2126
2127         rcu_read_lock();
2128
2129         sta = sta_info_get(local, hdr->addr1);
2130
2131         /* Send management frames and broadcast/multicast data using lowest
2132          * rate. */
2133         fc = le16_to_cpu(hdr->frame_control);
2134         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1) ||
2135             !sta || !sta->rate_ctrl_priv) {
2136                 sel->rate = rate_lowest(local, sband, sta);
2137                 goto out;
2138         }
2139
2140         lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
2141         i = sta->last_txrate_idx;
2142
2143         if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
2144             !lq_sta->ibss_sta_added) {
2145                 u8 sta_id = iwl_find_station(priv, hdr->addr1);
2146                 DECLARE_MAC_BUF(mac);
2147
2148                 if (sta_id == IWL_INVALID_STATION) {
2149                         IWL_DEBUG_RATE("LQ: ADD station %s\n",
2150                                        print_mac(mac, hdr->addr1));
2151                         sta_id = iwl4965_add_station_flags(priv, hdr->addr1,
2152                                                         0, CMD_ASYNC, NULL);
2153                 }
2154                 if ((sta_id != IWL_INVALID_STATION)) {
2155                         lq_sta->lq.sta_id = sta_id;
2156                         lq_sta->lq.rs_table[0].rate_n_flags = 0;
2157                         lq_sta->ibss_sta_added = 1;
2158                         rs_initialize_lq(priv, conf, sta);
2159                 }
2160                 if (!lq_sta->ibss_sta_added)
2161                         goto done;
2162         }
2163
2164 done:
2165         if ((i < 0) || (i > IWL_RATE_COUNT)) {
2166                 sel->rate = rate_lowest(local, sband, sta);
2167                 goto out;
2168         }
2169
2170         sel->rate = &priv->ieee_rates[i];
2171 out:
2172         rcu_read_unlock();
2173 }
2174
2175 static void *rs_alloc_sta(void *priv, gfp_t gfp)
2176 {
2177         struct iwl4965_lq_sta *lq_sta;
2178         int i, j;
2179
2180         IWL_DEBUG_RATE("create station rate scale window\n");
2181
2182         lq_sta = kzalloc(sizeof(struct iwl4965_lq_sta), gfp);
2183
2184         if (lq_sta == NULL)
2185                 return NULL;
2186         lq_sta->lq.sta_id = 0xff;
2187
2188
2189         for (j = 0; j < LQ_SIZE; j++)
2190                 for (i = 0; i < IWL_RATE_COUNT; i++)
2191                         rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
2192
2193         return lq_sta;
2194 }
2195
2196 static void rs_rate_init(void *priv_rate, void *priv_sta,
2197                          struct ieee80211_local *local,
2198                          struct sta_info *sta)
2199 {
2200         int i, j;
2201         struct ieee80211_conf *conf = &local->hw.conf;
2202         struct ieee80211_supported_band *sband;
2203         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
2204         struct iwl4965_lq_sta *lq_sta = priv_sta;
2205
2206         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2207
2208         lq_sta->flush_timer = 0;
2209         lq_sta->supp_rates = sta->supp_rates[sband->band];
2210         sta->txrate_idx = 3;
2211         for (j = 0; j < LQ_SIZE; j++)
2212                 for (i = 0; i < IWL_RATE_COUNT; i++)
2213                         rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
2214
2215         IWL_DEBUG_RATE("rate scale global init\n");
2216         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2217          * the lowest or the highest rate.. Could consider using RSSI from
2218          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2219          * after assoc.. */
2220
2221         lq_sta->ibss_sta_added = 0;
2222         if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
2223                 u8 sta_id = iwl_find_station(priv, sta->addr);
2224                 DECLARE_MAC_BUF(mac);
2225
2226                 /* for IBSS the call are from tasklet */
2227                 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2228                              print_mac(mac, sta->addr));
2229
2230                 if (sta_id == IWL_INVALID_STATION) {
2231                         IWL_DEBUG_RATE("LQ: ADD station %s\n",
2232                                        print_mac(mac, sta->addr));
2233                         sta_id = iwl4965_add_station_flags(priv, sta->addr,
2234                                                         0, CMD_ASYNC, NULL);
2235                 }
2236                 if ((sta_id != IWL_INVALID_STATION)) {
2237                         lq_sta->lq.sta_id = sta_id;
2238                         lq_sta->lq.rs_table[0].rate_n_flags = 0;
2239                 }
2240                 /* FIXME: this is w/a remove it later */
2241                 priv->assoc_station_added = 1;
2242         }
2243
2244         /* Find highest tx rate supported by hardware and destination station */
2245         for (i = 0; i < sband->n_bitrates; i++)
2246                 if (sta->supp_rates[sband->band] & BIT(i))
2247                         sta->txrate_idx = i;
2248
2249         sta->last_txrate_idx = sta->txrate_idx;
2250         /* WTF is with this bogus comment? A doesn't have cck rates */
2251         /* For MODE_IEEE80211A, cck rates are at end of rate table */
2252         if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
2253                 sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2254
2255         lq_sta->is_dup = 0;
2256         lq_sta->is_green = rs_use_green(priv, conf);
2257         lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2258         lq_sta->active_rate_basic = priv->active_rate_basic;
2259         lq_sta->band = priv->band;
2260 #ifdef CONFIG_IWL4965_HT
2261         /*
2262          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2263          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2264          */
2265         lq_sta->active_siso_rate =
2266                 priv->current_ht_config.supp_mcs_set[0] << 1;
2267         lq_sta->active_siso_rate |=
2268                 priv->current_ht_config.supp_mcs_set[0] & 0x1;
2269         lq_sta->active_siso_rate &= ~((u16)0x2);
2270         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2271
2272         /* Same here */
2273         lq_sta->active_mimo2_rate =
2274                 priv->current_ht_config.supp_mcs_set[1] << 1;
2275         lq_sta->active_mimo2_rate |=
2276                 priv->current_ht_config.supp_mcs_set[1] & 0x1;
2277         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2278         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2279
2280         lq_sta->active_mimo3_rate =
2281                 priv->current_ht_config.supp_mcs_set[2] << 1;
2282         lq_sta->active_mimo3_rate |=
2283                 priv->current_ht_config.supp_mcs_set[2] & 0x1;
2284         lq_sta->active_mimo3_rate &= ~((u16)0x2);
2285         lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2286
2287         IWL_DEBUG_RATE("SISO RATE %X MIMO2 RATE %X MIMO3 RATE %X\n",
2288                      lq_sta->active_siso_rate,
2289                      lq_sta->active_mimo2_rate,
2290                      lq_sta->active_mimo3_rate);
2291
2292         /* as default allow aggregation for all tids */
2293         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2294 #endif /*CONFIG_IWL4965_HT*/
2295 #ifdef CONFIG_MAC80211_DEBUGFS
2296         lq_sta->drv = priv;
2297 #endif
2298
2299         if (priv->assoc_station_added)
2300                 priv->lq_mngr.lq_ready = 1;
2301
2302         rs_initialize_lq(priv, conf, sta);
2303 }
2304
2305 static void rs_fill_link_cmd(const struct iwl_priv *priv,
2306                              struct iwl4965_lq_sta *lq_sta,
2307                              u32 new_rate,
2308                              struct iwl_link_quality_cmd *lq_cmd)
2309 {
2310         int index = 0;
2311         int rate_idx;
2312         int repeat_rate = 0;
2313         u8 ant_toggle_count = 0;
2314         u8 use_ht_possible = 1;
2315         struct iwl4965_scale_tbl_info tbl_type = { 0 };
2316
2317         /* Override starting rate (index 0) if needed for debug purposes */
2318         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2319
2320         /* Interpret new_rate (rate_n_flags) */
2321         rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2322                                   &tbl_type, &rate_idx);
2323
2324         /* How many times should we repeat the initial rate? */
2325         if (is_legacy(tbl_type.lq_type)) {
2326                 ant_toggle_count = 1;
2327                 repeat_rate = IWL_NUMBER_TRY;
2328         } else
2329                 repeat_rate = IWL_HT_NUMBER_TRY;
2330
2331         lq_cmd->general_params.mimo_delimiter =
2332                         is_mimo(tbl_type.lq_type) ? 1 : 0;
2333
2334         /* Fill 1st table entry (index 0) */
2335         lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2336
2337         /*FIXME:RS*/
2338         if (is_mimo(tbl_type.lq_type) || (tbl_type.ant_type == ANT_A))
2339                 lq_cmd->general_params.single_stream_ant_msk
2340                         = LINK_QUAL_ANT_A_MSK;
2341         else
2342                 lq_cmd->general_params.single_stream_ant_msk
2343                         = LINK_QUAL_ANT_B_MSK;
2344
2345         index++;
2346         repeat_rate--;
2347
2348         /* Fill rest of rate table */
2349         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2350                 /* Repeat initial/next rate.
2351                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2352                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2353                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2354                         if (is_legacy(tbl_type.lq_type)) {
2355                                 if (ant_toggle_count <
2356                                     NUM_TRY_BEFORE_ANTENNA_TOGGLE)
2357                                         ant_toggle_count++;
2358                                 else if (priv && rs_is_other_ant_connected(
2359                                                 priv->hw_params.valid_tx_ant,
2360                                                 tbl_type.ant_type)) {
2361                                         rs_toggle_antenna(&new_rate, &tbl_type);
2362                                         ant_toggle_count = 1;
2363                                 }
2364                         }
2365
2366                         /* Override next rate if needed for debug purposes */
2367                         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2368
2369                         /* Fill next table entry */
2370                         lq_cmd->rs_table[index].rate_n_flags =
2371                                         cpu_to_le32(new_rate);
2372                         repeat_rate--;
2373                         index++;
2374                 }
2375
2376                 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2377                                                 &rate_idx);
2378
2379                 /* Indicate to uCode which entries might be MIMO.
2380                  * If initial rate was MIMO, this will finally end up
2381                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2382                 if (is_mimo(tbl_type.lq_type))
2383                         lq_cmd->general_params.mimo_delimiter = index;
2384
2385                 /* Get next rate */
2386                 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2387                                              use_ht_possible);
2388
2389                 /* How many times should we repeat the next rate? */
2390                 if (is_legacy(tbl_type.lq_type)) {
2391                         if (ant_toggle_count < NUM_TRY_BEFORE_ANTENNA_TOGGLE)
2392                                 ant_toggle_count++;
2393                         else if (priv && rs_is_other_ant_connected(
2394                                                 priv->hw_params.valid_tx_ant,
2395                                                 tbl_type.ant_type)) {
2396                                 rs_toggle_antenna(&new_rate, &tbl_type);
2397                                 ant_toggle_count = 1;
2398                         }
2399                         repeat_rate = IWL_NUMBER_TRY;
2400                 } else
2401                         repeat_rate = IWL_HT_NUMBER_TRY;
2402
2403                 /* Don't allow HT rates after next pass.
2404                  * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2405                 use_ht_possible = 0;
2406
2407                 /* Override next rate if needed for debug purposes */
2408                 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2409
2410                 /* Fill next table entry */
2411                 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2412
2413                 index++;
2414                 repeat_rate--;
2415         }
2416
2417         lq_cmd->general_params.dual_stream_ant_msk = 3;
2418         lq_cmd->agg_params.agg_dis_start_th = 3;
2419         lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
2420 }
2421
2422 static void *rs_alloc(struct ieee80211_local *local)
2423 {
2424         return local->hw.priv;
2425 }
2426 /* rate scale requires free function to be implemented */
2427 static void rs_free(void *priv_rate)
2428 {
2429         return;
2430 }
2431
2432 static void rs_clear(void *priv_rate)
2433 {
2434         struct iwl_priv *priv = (struct iwl_priv *) priv_rate;
2435
2436         IWL_DEBUG_RATE("enter\n");
2437
2438         priv->lq_mngr.lq_ready = 0;
2439
2440         IWL_DEBUG_RATE("leave\n");
2441 }
2442
2443 static void rs_free_sta(void *priv, void *priv_sta)
2444 {
2445         struct iwl4965_lq_sta *lq_sta = priv_sta;
2446
2447         IWL_DEBUG_RATE("enter\n");
2448         kfree(lq_sta);
2449         IWL_DEBUG_RATE("leave\n");
2450 }
2451
2452
2453 #ifdef CONFIG_MAC80211_DEBUGFS
2454 static int open_file_generic(struct inode *inode, struct file *file)
2455 {
2456         file->private_data = inode->i_private;
2457         return 0;
2458 }
2459 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
2460                                 u32 *rate_n_flags, int index)
2461 {
2462         if (lq_sta->dbg_fixed_rate) {
2463                 if (index < 12) {
2464                         *rate_n_flags = lq_sta->dbg_fixed_rate;
2465                 } else {
2466                         if (lq_sta->band == IEEE80211_BAND_5GHZ)
2467                                 *rate_n_flags = 0x800D;
2468                         else
2469                                 *rate_n_flags = 0x820A;
2470                 }
2471                 IWL_DEBUG_RATE("Fixed rate ON\n");
2472         } else {
2473                 IWL_DEBUG_RATE("Fixed rate OFF\n");
2474         }
2475 }
2476
2477 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2478                         const char __user *user_buf, size_t count, loff_t *ppos)
2479 {
2480         struct iwl4965_lq_sta *lq_sta = file->private_data;
2481         char buf[64];
2482         int buf_size;
2483         u32 parsed_rate;
2484
2485         memset(buf, 0, sizeof(buf));
2486         buf_size = min(count, sizeof(buf) -  1);
2487         if (copy_from_user(buf, user_buf, buf_size))
2488                 return -EFAULT;
2489
2490         if (sscanf(buf, "%x", &parsed_rate) == 1)
2491                 lq_sta->dbg_fixed_rate = parsed_rate;
2492         else
2493                 lq_sta->dbg_fixed_rate = 0;
2494
2495         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
2496         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2497         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2498         lq_sta->active_mimo3_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2499
2500         IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2501                 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2502
2503         if (lq_sta->dbg_fixed_rate) {
2504                 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate,
2505                                                                 &lq_sta->lq);
2506                 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2507         }
2508
2509         return count;
2510 }
2511
2512 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2513                         char __user *user_buf, size_t count, loff_t *ppos)
2514 {
2515         char buff[1024];
2516         int desc = 0;
2517         int i = 0;
2518
2519         struct iwl4965_lq_sta *lq_sta = file->private_data;
2520
2521         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2522         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2523                         lq_sta->total_failed, lq_sta->total_success,
2524                         lq_sta->active_legacy_rate);
2525         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2526                         lq_sta->dbg_fixed_rate);
2527         desc += sprintf(buff+desc, "general:"
2528                 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2529                 lq_sta->lq.general_params.flags,
2530                 lq_sta->lq.general_params.mimo_delimiter,
2531                 lq_sta->lq.general_params.single_stream_ant_msk,
2532                 lq_sta->lq.general_params.dual_stream_ant_msk);
2533
2534         desc += sprintf(buff+desc, "agg:"
2535                         "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2536                         le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2537                         lq_sta->lq.agg_params.agg_dis_start_th,
2538                         lq_sta->lq.agg_params.agg_frame_cnt_limit);
2539
2540         desc += sprintf(buff+desc,
2541                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2542                         lq_sta->lq.general_params.start_rate_index[0],
2543                         lq_sta->lq.general_params.start_rate_index[1],
2544                         lq_sta->lq.general_params.start_rate_index[2],
2545                         lq_sta->lq.general_params.start_rate_index[3]);
2546
2547
2548         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2549                 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
2550                         i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2551
2552         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2553 }
2554
2555 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2556         .write = rs_sta_dbgfs_scale_table_write,
2557         .read = rs_sta_dbgfs_scale_table_read,
2558         .open = open_file_generic,
2559 };
2560 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2561                         char __user *user_buf, size_t count, loff_t *ppos)
2562 {
2563         char buff[1024];
2564         int desc = 0;
2565         int i, j;
2566
2567         struct iwl4965_lq_sta *lq_sta = file->private_data;
2568         for (i = 0; i < LQ_SIZE; i++) {
2569                 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2570                                 "rate=0x%X\n",
2571                                 lq_sta->active_tbl == i?"*":"x",
2572                                 lq_sta->lq_info[i].lq_type,
2573                                 lq_sta->lq_info[i].is_SGI,
2574                                 lq_sta->lq_info[i].is_fat,
2575                                 lq_sta->lq_info[i].is_dup,
2576                                 lq_sta->lq_info[i].current_rate);
2577                 for (j = 0; j < IWL_RATE_COUNT; j++) {
2578                         desc += sprintf(buff+desc,
2579                                 "counter=%d success=%d %%=%d\n",
2580                                 lq_sta->lq_info[i].win[j].counter,
2581                                 lq_sta->lq_info[i].win[j].success_counter,
2582                                 lq_sta->lq_info[i].win[j].success_ratio);
2583                 }
2584         }
2585         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2586 }
2587
2588 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2589         .read = rs_sta_dbgfs_stats_table_read,
2590         .open = open_file_generic,
2591 };
2592
2593 static void rs_add_debugfs(void *priv, void *priv_sta,
2594                                         struct dentry *dir)
2595 {
2596         struct iwl4965_lq_sta *lq_sta = priv_sta;
2597         lq_sta->rs_sta_dbgfs_scale_table_file =
2598                 debugfs_create_file("rate_scale_table", 0600, dir,
2599                                 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2600         lq_sta->rs_sta_dbgfs_stats_table_file =
2601                 debugfs_create_file("rate_stats_table", 0600, dir,
2602                         lq_sta, &rs_sta_dbgfs_stats_table_ops);
2603 #ifdef CONFIG_IWL4965_HT
2604         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2605                 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
2606                 &lq_sta->tx_agg_tid_en);
2607 #endif
2608
2609 }
2610
2611 static void rs_remove_debugfs(void *priv, void *priv_sta)
2612 {
2613         struct iwl4965_lq_sta *lq_sta = priv_sta;
2614         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2615         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2616 #ifdef CONFIG_IWL4965_HT
2617         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2618 #endif
2619 }
2620 #endif
2621
2622 static struct rate_control_ops rs_ops = {
2623         .module = NULL,
2624         .name = RS_NAME,
2625         .tx_status = rs_tx_status,
2626         .get_rate = rs_get_rate,
2627         .rate_init = rs_rate_init,
2628         .clear = rs_clear,
2629         .alloc = rs_alloc,
2630         .free = rs_free,
2631         .alloc_sta = rs_alloc_sta,
2632         .free_sta = rs_free_sta,
2633 #ifdef CONFIG_MAC80211_DEBUGFS
2634         .add_sta_debugfs = rs_add_debugfs,
2635         .remove_sta_debugfs = rs_remove_debugfs,
2636 #endif
2637 };
2638
2639 int iwl4965_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id)
2640 {
2641         struct ieee80211_local *local = hw_to_local(hw);
2642         struct iwl_priv *priv = hw->priv;
2643         struct iwl4965_lq_sta *lq_sta;
2644         struct sta_info *sta;
2645         int cnt = 0, i;
2646         u32 samples = 0, success = 0, good = 0;
2647         unsigned long now = jiffies;
2648         u32 max_time = 0;
2649         u8 lq_type, antenna;
2650
2651         rcu_read_lock();
2652
2653         sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
2654         if (!sta || !sta->rate_ctrl_priv) {
2655                 if (sta)
2656                         IWL_DEBUG_RATE("leave - no private rate data!\n");
2657                 else
2658                         IWL_DEBUG_RATE("leave - no station!\n");
2659                 rcu_read_unlock();
2660                 return sprintf(buf, "station %d not found\n", sta_id);
2661         }
2662
2663         lq_sta = (void *)sta->rate_ctrl_priv;
2664
2665         lq_type = lq_sta->lq_info[lq_sta->active_tbl].lq_type;
2666         antenna = lq_sta->lq_info[lq_sta->active_tbl].ant_type;
2667
2668         if (is_legacy(lq_type))
2669                 i = IWL_RATE_54M_INDEX;
2670         else
2671                 i = IWL_RATE_60M_INDEX;
2672         while (1) {
2673                 u64 mask;
2674                 int j;
2675                 int active = lq_sta->active_tbl;
2676
2677                 cnt +=
2678                     sprintf(&buf[cnt], " %2dMbs: ", iwl4965_rates[i].ieee / 2);
2679
2680                 mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1));
2681                 for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1)
2682                         buf[cnt++] =
2683                                 (lq_sta->lq_info[active].win[i].data & mask)
2684                                 ? '1' : '0';
2685
2686                 samples += lq_sta->lq_info[active].win[i].counter;
2687                 good += lq_sta->lq_info[active].win[i].success_counter;
2688                 success += lq_sta->lq_info[active].win[i].success_counter *
2689                            iwl4965_rates[i].ieee;
2690
2691                 if (lq_sta->lq_info[active].win[i].stamp) {
2692                         int delta =
2693                                    jiffies_to_msecs(now -
2694                                    lq_sta->lq_info[active].win[i].stamp);
2695
2696                         if (delta > max_time)
2697                                 max_time = delta;
2698
2699                         cnt += sprintf(&buf[cnt], "%5dms\n", delta);
2700                 } else
2701                         buf[cnt++] = '\n';
2702
2703                 j = iwl4965_get_prev_ieee_rate(i);
2704                 if (j == i)
2705                         break;
2706                 i = j;
2707         }
2708
2709         /* Display the average rate of all samples taken.
2710          *
2711          * NOTE:  We multiply # of samples by 2 since the IEEE measurement
2712          * added from iwl4965_rates is actually 2X the rate */
2713         if (samples)
2714                 cnt += sprintf(&buf[cnt],
2715                          "\nAverage rate is %3d.%02dMbs over last %4dms\n"
2716                          "%3d%% success (%d good packets over %d tries)\n",
2717                          success / (2 * samples), (success * 5 / samples) % 10,
2718                          max_time, good * 100 / samples, good, samples);
2719         else
2720                 cnt += sprintf(&buf[cnt], "\nAverage rate: 0Mbs\n");
2721
2722         cnt += sprintf(&buf[cnt], "\nrate scale type %d antenna %d "
2723                          "active_search %d rate index %d\n", lq_type, antenna,
2724                          lq_sta->search_better_tbl, sta->last_txrate_idx);
2725
2726         rcu_read_unlock();
2727         return cnt;
2728 }
2729
2730 void iwl4965_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
2731 {
2732         struct iwl_priv *priv = hw->priv;
2733
2734         priv->lq_mngr.lq_ready = 1;
2735 }
2736
2737 int iwl4965_rate_control_register(void)
2738 {
2739         return ieee80211_rate_control_register(&rs_ops);
2740 }
2741
2742 void iwl4965_rate_control_unregister(void)
2743 {
2744         ieee80211_rate_control_unregister(&rs_ops);
2745 }
2746