git.oblomov.eu Git - linux-2.6/blob - drivers/net/wireless/iwlwifi/iwl-4965-rs.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2008 Intel Corporation. All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  * Contact Information:
  22  * James P. Ketrenos <ipw2100-admin@linux.intel.com>
  23  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  24  *
  25  *****************************************************************************/
  26 #include <linux/kernel.h>
  27 #include <linux/init.h>
  28 #include <linux/skbuff.h>
  29 #include <linux/wireless.h>
  30 #include <net/mac80211.h>
  31
  32 #include <linux/netdevice.h>
  33 #include <linux/etherdevice.h>
  34 #include <linux/delay.h>
  35
  36 #include <linux/workqueue.h>
  37
  38 #include "../net/mac80211/rate.h"
  39
  40 #include "iwl-4965.h"
  41 #include "iwl-core.h"
  42 #include "iwl-helpers.h"
  43
  44 #define RS_NAME "iwl-4965-rs"
  45
  46 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
  47 #define IWL_NUMBER_TRY      1
  48 #define IWL_HT_NUMBER_TRY   3
  49
  50 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  51 #define IWL_RATE_MIN_FAILURE_TH         6       /* min failures to calc tpt */
  52 #define IWL_RATE_MIN_SUCCESS_TH         8       /* min successes to calc tpt */
  53
  54 /* max 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 static const u8 ant_toggle_lookup[] = {
  68         /*ANT_NONE -> */ ANT_NONE,
  69         /*ANT_A    -> */ ANT_B,
  70         /*ANT_B    -> */ ANT_C,
  71         /*ANT_AB   -> */ ANT_BC,
  72         /*ANT_C    -> */ ANT_A,
  73         /*ANT_AC   -> */ ANT_AB,
  74         /*ANT_BC   -> */ ANT_AC,
  75         /*ANT_ABC  -> */ ANT_ABC,
  76 };
  77
  78 /**
  79  * struct iwl4965_rate_scale_data -- tx success history for one rate
  80  */
  81 struct iwl4965_rate_scale_data {
  82         u64 data;               /* bitmap of successful frames */
  83         s32 success_counter;    /* number of frames successful */
  84         s32 success_ratio;      /* per-cent * 128  */
  85         s32 counter;            /* number of frames attempted */
  86         s32 average_tpt;        /* success ratio * expected throughput */
  87         unsigned long stamp;
  88 };
  89
  90 /**
  91  * struct iwl4965_scale_tbl_info -- tx params and success history for all rates
  92  *
  93  * There are two of these in struct iwl4965_lq_sta,
  94  * one for "active", and one for "search".
  95  */
  96 struct iwl4965_scale_tbl_info {
  97         enum iwl_table_type lq_type;
  98         u8 ant_type;
  99         u8 is_SGI;      /* 1 = short guard interval */
 100         u8 is_fat;      /* 1 = 40 MHz channel width */
 101         u8 is_dup;      /* 1 = duplicated data streams */
 102         u8 action;      /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
 103         s32 *expected_tpt;      /* throughput metrics; expected_tpt_G, etc. */
 104         u32 current_rate;  /* rate_n_flags, uCode API format */
 105         struct iwl4965_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
 106 };
 107
 108 #ifdef CONFIG_IWL4965_HT
 109
 110 struct iwl4965_traffic_load {
 111         unsigned long time_stamp;       /* age of the oldest statistics */
 112         u32 packet_count[TID_QUEUE_MAX_SIZE];   /* packet count in this time
 113                                                  * slice */
 114         u32 total;                      /* total num of packets during the
 115                                          * last TID_MAX_TIME_DIFF */
 116         u8 queue_count;                 /* number of queues that has
 117                                          * been used since the last cleanup */
 118         u8 head;                        /* start of the circular buffer */
 119 };
 120
 121 #endif /* CONFIG_IWL4965_HT */
 122
 123 /**
 124  * struct iwl4965_lq_sta -- driver's rate scaling private structure
 125  *
 126  * Pointer to this gets passed back and forth between driver and mac80211.
 127  */
 128 struct iwl4965_lq_sta {
 129         u8 active_tbl;          /* index of active table, range 0-1 */
 130         u8 enable_counter;      /* indicates HT mode */
 131         u8 stay_in_tbl;         /* 1: disallow, 0: allow search for new mode */
 132         u8 search_better_tbl;   /* 1: currently trying alternate mode */
 133         s32 last_tpt;
 134
 135         /* The following determine when to search for a new mode */
 136         u32 table_count_limit;
 137         u32 max_failure_limit;  /* # failed frames before new search */
 138         u32 max_success_limit;  /* # successful frames before new search */
 139         u32 table_count;
 140         u32 total_failed;       /* total failed frames, any/all rates */
 141         u32 total_success;      /* total successful frames, any/all rates */
 142         u32 flush_timer;        /* time staying in mode before new search */
 143
 144         u8 action_counter;      /* # mode-switch actions tried */
 145         u8 is_green;
 146         u8 is_dup;
 147         enum ieee80211_band band;
 148         u8 ibss_sta_added;
 149
 150         /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
 151         u32 supp_rates;
 152         u16 active_legacy_rate;
 153         u16 active_siso_rate;
 154         u16 active_mimo2_rate;
 155         u16 active_mimo3_rate;
 156         u16 active_rate_basic;
 157
 158         struct iwl_link_quality_cmd lq;
 159         struct iwl4965_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
 160 #ifdef CONFIG_IWL4965_HT
 161         struct iwl4965_traffic_load load[TID_MAX_LOAD_COUNT];
 162         u8 tx_agg_tid_en;
 163 #endif
 164 #ifdef CONFIG_MAC80211_DEBUGFS
 165         struct dentry *rs_sta_dbgfs_scale_table_file;
 166         struct dentry *rs_sta_dbgfs_stats_table_file;
 167 #ifdef CONFIG_IWL4965_HT
 168         struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
 169 #endif
 170         u32 dbg_fixed_rate;
 171         struct iwl_priv *drv;
 172 #endif
 173 };
 174
 175 static void rs_rate_scale_perform(struct iwl_priv *priv,
 176                                    struct net_device *dev,
 177                                    struct ieee80211_hdr *hdr,
 178                                    struct sta_info *sta);
 179 static void rs_fill_link_cmd(const struct iwl_priv *priv,
 180                              struct iwl4965_lq_sta *lq_sta,
 181                              u32 rate_n_flags);
 182
 183
 184 #ifdef CONFIG_MAC80211_DEBUGFS
 185 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
 186                                         u32 *rate_n_flags, int index);
 187 #else
 188 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
 189                                         u32 *rate_n_flags, int index)
 190 {}
 191 #endif
 192
 193 /*
 194  * Expected throughput metrics for following rates:
 195  * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 196  * "G" is the only table that supports CCK (the first 4 rates).
 197  */
 198 /*FIXME:RS:need to spearate tables for MIMO2/MIMO3*/
 199 static s32 expected_tpt_A[IWL_RATE_COUNT] = {
 200         0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
 201 };
 202
 203 static s32 expected_tpt_G[IWL_RATE_COUNT] = {
 204         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
 205 };
 206
 207 static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
 208         0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
 209 };
 210
 211 static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
 212         0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
 213 };
 214
 215 static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
 216         0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
 217 };
 218
 219 static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
 220         0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
 221 };
 222
 223 static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
 224         0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
 225 };
 226
 227 static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
 228         0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
 229 };
 230
 231 static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
 232         0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
 233 };
 234
 235 static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
 236         0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
 237 };
 238
 239 static inline u8 rs_extract_rate(u32 rate_n_flags)
 240 {
 241         return (u8)(rate_n_flags & 0xFF);
 242 }
 243
 244 static void rs_rate_scale_clear_window(struct iwl4965_rate_scale_data *window)
 245 {
 246         window->data = 0;
 247         window->success_counter = 0;
 248         window->success_ratio = IWL_INVALID_VALUE;
 249         window->counter = 0;
 250         window->average_tpt = IWL_INVALID_VALUE;
 251         window->stamp = 0;
 252 }
 253
 254 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 255 {
 256         return ((ant_type & valid_antenna) == ant_type);
 257 }
 258
 259 #ifdef CONFIG_IWL4965_HT
 260 /*
 261  *      removes the old data from the statistics. All data that is older than
 262  *      TID_MAX_TIME_DIFF, will be deleted.
 263  */
 264 static void rs_tl_rm_old_stats(struct iwl4965_traffic_load *tl, u32 curr_time)
 265 {
 266         /* The oldest age we want to keep */
 267         u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
 268
 269         while (tl->queue_count &&
 270                (tl->time_stamp < oldest_time)) {
 271                 tl->total -= tl->packet_count[tl->head];
 272                 tl->packet_count[tl->head] = 0;
 273                 tl->time_stamp += TID_QUEUE_CELL_SPACING;
 274                 tl->queue_count--;
 275                 tl->head++;
 276                 if (tl->head >= TID_QUEUE_MAX_SIZE)
 277                         tl->head = 0;
 278         }
 279 }
 280
 281 /*
 282  *      increment traffic load value for tid and also remove
 283  *      any old values if passed the certain time period
 284  */
 285 static void rs_tl_add_packet(struct iwl4965_lq_sta *lq_data, u8 tid)
 286 {
 287         u32 curr_time = jiffies_to_msecs(jiffies);
 288         u32 time_diff;
 289         s32 index;
 290         struct iwl4965_traffic_load *tl = NULL;
 291
 292         if (tid >= TID_MAX_LOAD_COUNT)
 293                 return;
 294
 295         tl = &lq_data->load[tid];
 296
 297         curr_time -= curr_time % TID_ROUND_VALUE;
 298
 299         /* Happens only for the first packet. Initialize the data */
 300         if (!(tl->queue_count)) {
 301                 tl->total = 1;
 302                 tl->time_stamp = curr_time;
 303                 tl->queue_count = 1;
 304                 tl->head = 0;
 305                 tl->packet_count[0] = 1;
 306                 return;
 307         }
 308
 309         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 310         index = time_diff / TID_QUEUE_CELL_SPACING;
 311
 312         /* The history is too long: remove data that is older than */
 313         /* TID_MAX_TIME_DIFF */
 314         if (index >= TID_QUEUE_MAX_SIZE)
 315                 rs_tl_rm_old_stats(tl, curr_time);
 316
 317         index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
 318         tl->packet_count[index] = tl->packet_count[index] + 1;
 319         tl->total = tl->total + 1;
 320
 321         if ((index + 1) > tl->queue_count)
 322                 tl->queue_count = index + 1;
 323 }
 324
 325 /*
 326         get the traffic load value for tid
 327 */
 328 static u32 rs_tl_get_load(struct iwl4965_lq_sta *lq_data, u8 tid)
 329 {
 330         u32 curr_time = jiffies_to_msecs(jiffies);
 331         u32 time_diff;
 332         s32 index;
 333         struct iwl4965_traffic_load *tl = NULL;
 334
 335         if (tid >= TID_MAX_LOAD_COUNT)
 336                 return 0;
 337
 338         tl = &(lq_data->load[tid]);
 339
 340         curr_time -= curr_time % TID_ROUND_VALUE;
 341
 342         if (!(tl->queue_count))
 343                 return 0;
 344
 345         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 346         index = time_diff / TID_QUEUE_CELL_SPACING;
 347
 348         /* The history is too long: remove data that is older than */
 349         /* TID_MAX_TIME_DIFF */
 350         if (index >= TID_QUEUE_MAX_SIZE)
 351                 rs_tl_rm_old_stats(tl, curr_time);
 352
 353         return tl->total;
 354 }
 355
 356 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
 357                                 struct iwl4965_lq_sta *lq_data, u8 tid,
 358                                 struct sta_info *sta)
 359 {
 360         unsigned long state;
 361         DECLARE_MAC_BUF(mac);
 362
 363         spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
 364         state = sta->ampdu_mlme.tid_state_tx[tid];
 365         spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
 366
 367         if (state == HT_AGG_STATE_IDLE &&
 368             rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
 369                 IWL_DEBUG_HT("Starting Tx agg: STA: %s tid: %d\n",
 370                                 print_mac(mac, sta->addr), tid);
 371                 ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
 372         }
 373 }
 374
 375 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
 376                                 struct iwl4965_lq_sta *lq_data,
 377                                 struct sta_info *sta)
 378 {
 379         if ((tid < TID_MAX_LOAD_COUNT))
 380                 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 381         else if (tid == IWL_AGG_ALL_TID)
 382                 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
 383                         rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 384 }
 385
 386 #endif /* CONFIG_IWLWIFI_HT */
 387
 388 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 389 {
 390         return (!!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 391                 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 392                 !!(rate_n_flags & RATE_MCS_ANT_C_MSK));
 393 }
 394
 395 /**
 396  * rs_collect_tx_data - Update the success/failure sliding window
 397  *
 398  * We keep a sliding window of the last 62 packets transmitted
 399  * at this rate.  window->data contains the bitmask of successful
 400  * packets.
 401  */
 402 static int rs_collect_tx_data(struct iwl4965_rate_scale_data *windows,
 403                               int scale_index, s32 tpt, int retries,
 404                               int successes)
 405 {
 406         struct iwl4965_rate_scale_data *window = NULL;
 407         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 408         s32 fail_count;
 409
 410         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 411                 return -EINVAL;
 412
 413         /* Select data for current tx bit rate */
 414         window = &(windows[scale_index]);
 415
 416         /*
 417          * Keep track of only the latest 62 tx frame attempts in this rate's
 418          * history window; anything older isn't really relevant any more.
 419          * If we have filled up the sliding window, drop the oldest attempt;
 420          * if the oldest attempt (highest bit in bitmap) shows "success",
 421          * subtract "1" from the success counter (this is the main reason
 422          * we keep these bitmaps!).
 423          */
 424         while (retries > 0) {
 425                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 426
 427                         /* remove earliest */
 428                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 429
 430                         if (window->data & mask) {
 431                                 window->data &= ~mask;
 432                                 window->success_counter--;
 433                         }
 434                 }
 435
 436                 /* Increment frames-attempted counter */
 437                 window->counter++;
 438
 439                 /* Shift bitmap by one frame (throw away oldest history),
 440                  * OR in "1", and increment "success" if this
 441                  * frame was successful. */
 442                 window->data <<= 1;;
 443                 if (successes > 0) {
 444                         window->success_counter++;
 445                         window->data |= 0x1;
 446                         successes--;
 447                 }
 448
 449                 retries--;
 450         }
 451
 452         /* Calculate current success ratio, avoid divide-by-0! */
 453         if (window->counter > 0)
 454                 window->success_ratio = 128 * (100 * window->success_counter)
 455                                         / window->counter;
 456         else
 457                 window->success_ratio = IWL_INVALID_VALUE;
 458
 459         fail_count = window->counter - window->success_counter;
 460
 461         /* Calculate average throughput, if we have enough history. */
 462         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 463             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 464                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 465         else
 466                 window->average_tpt = IWL_INVALID_VALUE;
 467
 468         /* Tag this window as having been updated */
 469         window->stamp = jiffies;
 470
 471         return 0;
 472 }
 473
 474 /*
 475  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
 476  */
 477 /* FIXME:RS:remove this function and put the flags statically in the table */
 478 static u32 rate_n_flags_from_tbl(struct iwl4965_scale_tbl_info *tbl,
 479                                        int index, u8 use_green)
 480 {
 481         u32 rate_n_flags = 0;
 482
 483         if (is_legacy(tbl->lq_type)) {
 484                 rate_n_flags = iwl4965_rates[index].plcp;
 485                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 486                         rate_n_flags |= RATE_MCS_CCK_MSK;
 487
 488         } else if (is_Ht(tbl->lq_type)) {
 489                 if (index > IWL_LAST_OFDM_RATE) {
 490                         IWL_ERROR("invalid HT rate index %d\n", index);
 491                         index = IWL_LAST_OFDM_RATE;
 492                 }
 493                 rate_n_flags = RATE_MCS_HT_MSK;
 494
 495                 if (is_siso(tbl->lq_type))
 496                         rate_n_flags |= iwl4965_rates[index].plcp_siso;
 497                 else if (is_mimo2(tbl->lq_type))
 498                         rate_n_flags |= iwl4965_rates[index].plcp_mimo2;
 499                 else
 500                         rate_n_flags |= iwl4965_rates[index].plcp_mimo3;
 501         } else {
 502                 IWL_ERROR("Invalid tbl->lq_type %d\n", tbl->lq_type);
 503         }
 504
 505         rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
 506                                                      RATE_MCS_ANT_ABC_MSK);
 507
 508         if (is_Ht(tbl->lq_type)) {
 509                 if (tbl->is_fat) {
 510                         if (tbl->is_dup)
 511                                 rate_n_flags |= RATE_MCS_DUP_MSK;
 512                         else
 513                                 rate_n_flags |= RATE_MCS_FAT_MSK;
 514                 }
 515                 if (tbl->is_SGI)
 516                         rate_n_flags |= RATE_MCS_SGI_MSK;
 517
 518                 if (use_green) {
 519                         rate_n_flags |= RATE_MCS_GF_MSK;
 520                         if (is_siso(tbl->lq_type) && tbl->is_SGI) {
 521                                 rate_n_flags &= ~RATE_MCS_SGI_MSK;
 522                                 IWL_ERROR("GF was set with SGI:SISO\n");
 523                         }
 524                 }
 525         }
 526         return rate_n_flags;
 527 }
 528
 529 /*
 530  * Interpret uCode API's rate_n_flags format,
 531  * fill "search" or "active" tx mode table.
 532  */
 533 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
 534                                     enum ieee80211_band band,
 535                                     struct iwl4965_scale_tbl_info *tbl,
 536                                     int *rate_idx)
 537 {
 538         u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
 539         u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
 540         u8 mcs;
 541
 542         *rate_idx = iwl4965_hwrate_to_plcp_idx(rate_n_flags);
 543
 544         if (*rate_idx  == IWL_RATE_INVALID) {
 545                 *rate_idx = -1;
 546                 return -EINVAL;
 547         }
 548         tbl->is_SGI = 0;        /* default legacy setup */
 549         tbl->is_fat = 0;
 550         tbl->is_dup = 0;
 551         tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
 552         tbl->lq_type = LQ_NONE;
 553
 554         /* legacy rate format */
 555         if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
 556                 if (num_of_ant == 1) {
 557                         if (band == IEEE80211_BAND_5GHZ)
 558                                 tbl->lq_type = LQ_A;
 559                         else
 560                                 tbl->lq_type = LQ_G;
 561                 }
 562         /* HT rate format */
 563         } else {
 564                 if (rate_n_flags & RATE_MCS_SGI_MSK)
 565                         tbl->is_SGI = 1;
 566
 567                 if ((rate_n_flags & RATE_MCS_FAT_MSK) ||
 568                     (rate_n_flags & RATE_MCS_DUP_MSK))
 569                         tbl->is_fat = 1;
 570
 571                 if (rate_n_flags & RATE_MCS_DUP_MSK)
 572                         tbl->is_dup = 1;
 573
 574                 mcs = rs_extract_rate(rate_n_flags);
 575
 576                 /* SISO */
 577                 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
 578                         if (num_of_ant == 1)
 579                                 tbl->lq_type = LQ_SISO; /*else NONE*/
 580                 /* MIMO2 */
 581                 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
 582                         if (num_of_ant == 2)
 583                                 tbl->lq_type = LQ_MIMO2;
 584                 /* MIMO3 */
 585                 } else {
 586                         if (num_of_ant == 3)
 587                                 tbl->lq_type = LQ_MIMO3;
 588                 }
 589         }
 590         return 0;
 591 }
 592
 593 /* switch to another antenna/antennas and return 1 */
 594 /* if no other valid antenna found, return 0 */
 595 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
 596                               struct iwl4965_scale_tbl_info *tbl)
 597 {
 598         u8 new_ant_type;
 599
 600         if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
 601                 return 0;
 602
 603         if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
 604                 return 0;
 605
 606         new_ant_type = ant_toggle_lookup[tbl->ant_type];
 607
 608         while ((new_ant_type != tbl->ant_type) &&
 609                !rs_is_valid_ant(valid_ant, new_ant_type))
 610                 new_ant_type = ant_toggle_lookup[new_ant_type];
 611
 612         if (new_ant_type == tbl->ant_type)
 613                 return 0;
 614
 615         tbl->ant_type = new_ant_type;
 616         *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
 617         *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
 618         return 1;
 619 }
 620
 621 /* FIXME:RS: in 4965 we don't use greenfield at all */
 622 /* FIXME:RS: don't use greenfield for now in TX */
 623 /* #ifdef CONFIG_IWL4965_HT */
 624 #if 0
 625 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
 626 {
 627         return ((conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) &&
 628                 priv->current_ht_config.is_green_field &&
 629                 !priv->current_ht_config.non_GF_STA_present);
 630 }
 631 #else
 632 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
 633 {
 634         return 0;
 635 }
 636 #endif  /* CONFIG_IWL4965_HT */
 637
 638 /**
 639  * rs_get_supported_rates - get the available rates
 640  *
 641  * if management frame or broadcast frame only return
 642  * basic available rates.
 643  *
 644  */
 645 static u16 rs_get_supported_rates(struct iwl4965_lq_sta *lq_sta,
 646                                    struct ieee80211_hdr *hdr,
 647                                    enum iwl_table_type rate_type)
 648 {
 649         if (hdr && is_multicast_ether_addr(hdr->addr1) &&
 650             lq_sta->active_rate_basic)
 651                 return lq_sta->active_rate_basic;
 652
 653         if (is_legacy(rate_type)) {
 654                 return lq_sta->active_legacy_rate;
 655         } else {
 656                 if (is_siso(rate_type))
 657                         return lq_sta->active_siso_rate;
 658                 else if (is_mimo2(rate_type))
 659                         return lq_sta->active_mimo2_rate;
 660                 else
 661                         return lq_sta->active_mimo3_rate;
 662         }
 663 }
 664
 665 static u16 rs_get_adjacent_rate(u8 index, u16 rate_mask, int rate_type)
 666 {
 667         u8 high = IWL_RATE_INVALID;
 668         u8 low = IWL_RATE_INVALID;
 669
 670         /* 802.11A or ht walks to the next literal adjacent rate in
 671          * the rate table */
 672         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 673                 int i;
 674                 u32 mask;
 675
 676                 /* Find the previous rate that is in the rate mask */
 677                 i = index - 1;
 678                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 679                         if (rate_mask & mask) {
 680                                 low = i;
 681                                 break;
 682                         }
 683                 }
 684
 685                 /* Find the next rate that is in the rate mask */
 686                 i = index + 1;
 687                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 688                         if (rate_mask & mask) {
 689                                 high = i;
 690                                 break;
 691                         }
 692                 }
 693
 694                 return (high << 8) | low;
 695         }
 696
 697         low = index;
 698         while (low != IWL_RATE_INVALID) {
 699                 low = iwl4965_rates[low].prev_rs;
 700                 if (low == IWL_RATE_INVALID)
 701                         break;
 702                 if (rate_mask & (1 << low))
 703                         break;
 704                 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
 705         }
 706
 707         high = index;
 708         while (high != IWL_RATE_INVALID) {
 709                 high = iwl4965_rates[high].next_rs;
 710                 if (high == IWL_RATE_INVALID)
 711                         break;
 712                 if (rate_mask & (1 << high))
 713                         break;
 714                 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
 715         }
 716
 717         return (high << 8) | low;
 718 }
 719
 720 static u32 rs_get_lower_rate(struct iwl4965_lq_sta *lq_sta,
 721                              struct iwl4965_scale_tbl_info *tbl, u8 scale_index,
 722                              u8 ht_possible)
 723 {
 724         s32 low;
 725         u16 rate_mask;
 726         u16 high_low;
 727         u8 switch_to_legacy = 0;
 728         u8 is_green = lq_sta->is_green;
 729
 730         /* check if we need to switch from HT to legacy rates.
 731          * assumption is that mandatory rates (1Mbps or 6Mbps)
 732          * are always supported (spec demand) */
 733         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
 734                 switch_to_legacy = 1;
 735                 scale_index = rs_ht_to_legacy[scale_index];
 736                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 737                         tbl->lq_type = LQ_A;
 738                 else
 739                         tbl->lq_type = LQ_G;
 740
 741                 if (num_of_ant(tbl->ant_type) > 1)
 742                         tbl->ant_type = ANT_A;/*FIXME:RS*/
 743
 744                 tbl->is_fat = 0;
 745                 tbl->is_SGI = 0;
 746         }
 747
 748         rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
 749
 750         /* Mask with station rate restriction */
 751         if (is_legacy(tbl->lq_type)) {
 752                 /* supp_rates has no CCK bits in A mode */
 753                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 754                         rate_mask  = (u16)(rate_mask &
 755                            (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
 756                 else
 757                         rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
 758         }
 759
 760         /* If we switched from HT to legacy, check current rate */
 761         if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
 762                 low = scale_index;
 763                 goto out;
 764         }
 765
 766         high_low = rs_get_adjacent_rate(scale_index, rate_mask, tbl->lq_type);
 767         low = high_low & 0xff;
 768
 769         if (low == IWL_RATE_INVALID)
 770                 low = scale_index;
 771
 772 out:
 773         return rate_n_flags_from_tbl(tbl, low, is_green);
 774 }
 775
 776 /*
 777  * mac80211 sends us Tx status
 778  */
 779 static void rs_tx_status(void *priv_rate, struct net_device *dev,
 780                          struct sk_buff *skb,
 781                          struct ieee80211_tx_status *tx_resp)
 782 {
 783         int status;
 784         u8 retries;
 785         int rs_index, index = 0;
 786         struct iwl4965_lq_sta *lq_sta;
 787         struct iwl_link_quality_cmd *table;
 788         struct sta_info *sta;
 789         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 790         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
 791         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 792         struct ieee80211_hw *hw = local_to_hw(local);
 793         struct iwl4965_rate_scale_data *window = NULL;
 794         struct iwl4965_rate_scale_data *search_win = NULL;
 795         u32 tx_rate;
 796         struct iwl4965_scale_tbl_info tbl_type;
 797         struct iwl4965_scale_tbl_info *curr_tbl, *search_tbl;
 798         u8 active_index = 0;
 799         u16 fc = le16_to_cpu(hdr->frame_control);
 800         s32 tpt = 0;
 801
 802         IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
 803
 804         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1))
 805                 return;
 806
 807         /* This packet was aggregated but doesn't carry rate scale info */
 808         if ((tx_resp->control.flags & IEEE80211_TXCTL_AMPDU) &&
 809             !(tx_resp->flags & IEEE80211_TX_STATUS_AMPDU))
 810                 return;
 811
 812         retries = tx_resp->retry_count;
 813
 814         if (retries > 15)
 815                 retries = 15;
 816
 817         rcu_read_lock();
 818
 819         sta = sta_info_get(local, hdr->addr1);
 820
 821         if (!sta || !sta->rate_ctrl_priv)
 822                 goto out;
 823
 824
 825         lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
 826
 827         if (!priv->lq_mngr.lq_ready)
 828                 goto out;
 829
 830         if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
 831             !lq_sta->ibss_sta_added)
 832                 goto out;
 833
 834         table = &lq_sta->lq;
 835         active_index = lq_sta->active_tbl;
 836
 837         curr_tbl = &(lq_sta->lq_info[active_index]);
 838         search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
 839         window = (struct iwl4965_rate_scale_data *)
 840             &(curr_tbl->win[0]);
 841         search_win = (struct iwl4965_rate_scale_data *)
 842             &(search_tbl->win[0]);
 843
 844         /*
 845          * Ignore this Tx frame response if its initial rate doesn't match
 846          * that of latest Link Quality command.  There may be stragglers
 847          * from a previous Link Quality command, but we're no longer interested
 848          * in those; they're either from the "active" mode while we're trying
 849          * to check "search" mode, or a prior "search" mode after we've moved
 850          * to a new "search" mode (which might become the new "active" mode).
 851          */
 852         tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
 853         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
 854         if (priv->band == IEEE80211_BAND_5GHZ)
 855                 rs_index -= IWL_FIRST_OFDM_RATE;
 856
 857         if ((tx_resp->control.tx_rate == NULL) ||
 858             (tbl_type.is_SGI ^
 859                 !!(tx_resp->control.flags & IEEE80211_TXCTL_SHORT_GI)) ||
 860             (tbl_type.is_fat ^
 861                 !!(tx_resp->control.flags & IEEE80211_TXCTL_40_MHZ_WIDTH)) ||
 862             (tbl_type.is_dup ^
 863                 !!(tx_resp->control.flags & IEEE80211_TXCTL_DUP_DATA)) ||
 864             (tbl_type.ant_type ^ tx_resp->control.antenna_sel_tx) ||
 865             (!!(tx_rate & RATE_MCS_HT_MSK) ^
 866                 !!(tx_resp->control.flags & IEEE80211_TXCTL_OFDM_HT)) ||
 867             (!!(tx_rate & RATE_MCS_GF_MSK) ^
 868                 !!(tx_resp->control.flags & IEEE80211_TXCTL_GREEN_FIELD)) ||
 869             (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
 870                 tx_resp->control.tx_rate->bitrate)) {
 871                 IWL_DEBUG_RATE("initial rate does not match 0x%x\n", tx_rate);
 872                 goto out;
 873         }
 874
 875         /* Update frame history window with "failure" for each Tx retry. */
 876         while (retries) {
 877                 /* Look up the rate and other info used for each tx attempt.
 878                  * Each tx attempt steps one entry deeper in the rate table. */
 879                 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
 880                 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
 881                                           &tbl_type, &rs_index);
 882
 883                 /* If type matches "search" table,
 884                  * add failure to "search" history */
 885                 if ((tbl_type.lq_type == search_tbl->lq_type) &&
 886                     (tbl_type.ant_type == search_tbl->ant_type) &&
 887                     (tbl_type.is_SGI == search_tbl->is_SGI)) {
 888                         if (search_tbl->expected_tpt)
 889                                 tpt = search_tbl->expected_tpt[rs_index];
 890                         else
 891                                 tpt = 0;
 892                         rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
 893
 894                 /* Else if type matches "current/active" table,
 895                  * add failure to "current/active" history */
 896                 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
 897                            (tbl_type.ant_type == curr_tbl->ant_type) &&
 898                            (tbl_type.is_SGI == curr_tbl->is_SGI)) {
 899                         if (curr_tbl->expected_tpt)
 900                                 tpt = curr_tbl->expected_tpt[rs_index];
 901                         else
 902                                 tpt = 0;
 903                         rs_collect_tx_data(window, rs_index, tpt, 1, 0);
 904                 }
 905
 906                 /* If not searching for a new mode, increment failed counter
 907                  * ... this helps determine when to start searching again */
 908                 if (lq_sta->stay_in_tbl)
 909                         lq_sta->total_failed++;
 910                 --retries;
 911                 index++;
 912
 913         }
 914
 915         /*
 916          * Find (by rate) the history window to update with final Tx attempt;
 917          * if Tx was successful first try, use original rate,
 918          * else look up the rate that was, finally, successful.
 919          */
 920         tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
 921         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
 922
 923         /* Update frame history window with "success" if Tx got ACKed ... */
 924         if (tx_resp->flags & IEEE80211_TX_STATUS_ACK)
 925                 status = 1;
 926         else
 927                 status = 0;
 928
 929         /* If type matches "search" table,
 930          * add final tx status to "search" history */
 931         if ((tbl_type.lq_type == search_tbl->lq_type) &&
 932             (tbl_type.ant_type == search_tbl->ant_type) &&
 933             (tbl_type.is_SGI == search_tbl->is_SGI)) {
 934                 if (search_tbl->expected_tpt)
 935                         tpt = search_tbl->expected_tpt[rs_index];
 936                 else
 937                         tpt = 0;
 938                 if (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU)
 939                         rs_collect_tx_data(search_win, rs_index, tpt,
 940                                            tx_resp->ampdu_ack_len,
 941                                            tx_resp->ampdu_ack_map);
 942                 else
 943                         rs_collect_tx_data(search_win, rs_index, tpt,
 944                                            1, status);
 945         /* Else if type matches "current/active" table,
 946          * add final tx status to "current/active" history */
 947         } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
 948                    (tbl_type.ant_type == curr_tbl->ant_type) &&
 949                    (tbl_type.is_SGI == curr_tbl->is_SGI)) {
 950                 if (curr_tbl->expected_tpt)
 951                         tpt = curr_tbl->expected_tpt[rs_index];
 952                 else
 953                         tpt = 0;
 954                 if (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU)
 955                         rs_collect_tx_data(window, rs_index, tpt,
 956                                            tx_resp->ampdu_ack_len,
 957                                            tx_resp->ampdu_ack_map);
 958                 else
 959                         rs_collect_tx_data(window, rs_index, tpt,
 960                                            1, status);
 961         }
 962
 963         /* If not searching for new mode, increment success/failed counter
 964          * ... these help determine when to start searching again */
 965         if (lq_sta->stay_in_tbl) {
 966                 if (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU) {
 967                         lq_sta->total_success += tx_resp->ampdu_ack_map;
 968                         lq_sta->total_failed +=
 969                              (tx_resp->ampdu_ack_len - tx_resp->ampdu_ack_map);
 970                 } else {
 971                         if (status)
 972                                 lq_sta->total_success++;
 973                         else
 974                                 lq_sta->total_failed++;
 975                 }
 976         }
 977
 978         /* See if there's a better rate or modulation mode to try. */
 979         rs_rate_scale_perform(priv, dev, hdr, sta);
 980 out:
 981         rcu_read_unlock();
 982         return;
 983 }
 984
 985 /*
 986  * Begin a period of staying with a selected modulation mode.
 987  * Set "stay_in_tbl" flag to prevent any mode switches.
 988  * Set frame tx success limits according to legacy vs. high-throughput,
 989  * and reset overall (spanning all rates) tx success history statistics.
 990  * These control how long we stay using same modulation mode before
 991  * searching for a new mode.
 992  */
 993 static void rs_set_stay_in_table(u8 is_legacy,
 994                                  struct iwl4965_lq_sta *lq_sta)
 995 {
 996         IWL_DEBUG_RATE("we are staying in the same table\n");
 997         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
 998         if (is_legacy) {
 999                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1000                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1001                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1002         } else {
1003                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1004                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1005                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1006         }
1007         lq_sta->table_count = 0;
1008         lq_sta->total_failed = 0;
1009         lq_sta->total_success = 0;
1010 }
1011
1012 /*
1013  * Find correct throughput table for given mode of modulation
1014  */
1015 static void rs_set_expected_tpt_table(struct iwl4965_lq_sta *lq_sta,
1016                                       struct iwl4965_scale_tbl_info *tbl)
1017 {
1018         if (is_legacy(tbl->lq_type)) {
1019                 if (!is_a_band(tbl->lq_type))
1020                         tbl->expected_tpt = expected_tpt_G;
1021                 else
1022                         tbl->expected_tpt = expected_tpt_A;
1023         } else if (is_siso(tbl->lq_type)) {
1024                 if (tbl->is_fat && !lq_sta->is_dup)
1025                         if (tbl->is_SGI)
1026                                 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
1027                         else
1028                                 tbl->expected_tpt = expected_tpt_siso40MHz;
1029                 else if (tbl->is_SGI)
1030                         tbl->expected_tpt = expected_tpt_siso20MHzSGI;
1031                 else
1032                         tbl->expected_tpt = expected_tpt_siso20MHz;
1033
1034         } else if (is_mimo(tbl->lq_type)) { /* FIXME:need to separate mimo2/3 */
1035                 if (tbl->is_fat && !lq_sta->is_dup)
1036                         if (tbl->is_SGI)
1037                                 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
1038                         else
1039                                 tbl->expected_tpt = expected_tpt_mimo40MHz;
1040                 else if (tbl->is_SGI)
1041                         tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
1042                 else
1043                         tbl->expected_tpt = expected_tpt_mimo20MHz;
1044         } else
1045                 tbl->expected_tpt = expected_tpt_G;
1046 }
1047
1048 #ifdef CONFIG_IWL4965_HT
1049 /*
1050  * Find starting rate for new "search" high-throughput mode of modulation.
1051  * Goal is to find lowest expected rate (under perfect conditions) that is
1052  * above the current measured throughput of "active" mode, to give new mode
1053  * a fair chance to prove itself without too many challenges.
1054  *
1055  * This gets called when transitioning to more aggressive modulation
1056  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1057  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1058  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1059  * bit rate will typically need to increase, but not if performance was bad.
1060  */
1061 static s32 rs_get_best_rate(struct iwl_priv *priv,
1062                             struct iwl4965_lq_sta *lq_sta,
1063                             struct iwl4965_scale_tbl_info *tbl, /* "search" */
1064                             u16 rate_mask, s8 index)
1065 {
1066         /* "active" values */
1067         struct iwl4965_scale_tbl_info *active_tbl =
1068             &(lq_sta->lq_info[lq_sta->active_tbl]);
1069         s32 active_sr = active_tbl->win[index].success_ratio;
1070         s32 active_tpt = active_tbl->expected_tpt[index];
1071
1072         /* expected "search" throughput */
1073         s32 *tpt_tbl = tbl->expected_tpt;
1074
1075         s32 new_rate, high, low, start_hi;
1076         u16 high_low;
1077         s8 rate = index;
1078
1079         new_rate = high = low = start_hi = IWL_RATE_INVALID;
1080
1081         for (; ;) {
1082                 high_low = rs_get_adjacent_rate(rate, rate_mask, tbl->lq_type);
1083
1084                 low = high_low & 0xff;
1085                 high = (high_low >> 8) & 0xff;
1086
1087                 /*
1088                  * Lower the "search" bit rate, to give new "search" mode
1089                  * approximately the same throughput as "active" if:
1090                  *
1091                  * 1) "Active" mode has been working modestly well (but not
1092                  *    great), and expected "search" throughput (under perfect
1093                  *    conditions) at candidate rate is above the actual
1094                  *    measured "active" throughput (but less than expected
1095                  *    "active" throughput under perfect conditions).
1096                  * OR
1097                  * 2) "Active" mode has been working perfectly or very well
1098                  *    and expected "search" throughput (under perfect
1099                  *    conditions) at candidate rate is above expected
1100                  *    "active" throughput (under perfect conditions).
1101                  */
1102                 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1103                      ((active_sr > IWL_RATE_DECREASE_TH) &&
1104                       (active_sr <= IWL_RATE_HIGH_TH) &&
1105                       (tpt_tbl[rate] <= active_tpt))) ||
1106                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1107                      (tpt_tbl[rate] > active_tpt))) {
1108
1109                         /* (2nd or later pass)
1110                          * If we've already tried to raise the rate, and are
1111                          * now trying to lower it, use the higher rate. */
1112                         if (start_hi != IWL_RATE_INVALID) {
1113                                 new_rate = start_hi;
1114                                 break;
1115                         }
1116
1117                         new_rate = rate;
1118
1119                         /* Loop again with lower rate */
1120                         if (low != IWL_RATE_INVALID)
1121                                 rate = low;
1122
1123                         /* Lower rate not available, use the original */
1124                         else
1125                                 break;
1126
1127                 /* Else try to raise the "search" rate to match "active" */
1128                 } else {
1129                         /* (2nd or later pass)
1130                          * If we've already tried to lower the rate, and are
1131                          * now trying to raise it, use the lower rate. */
1132                         if (new_rate != IWL_RATE_INVALID)
1133                                 break;
1134
1135                         /* Loop again with higher rate */
1136                         else if (high != IWL_RATE_INVALID) {
1137                                 start_hi = high;
1138                                 rate = high;
1139
1140                         /* Higher rate not available, use the original */
1141                         } else {
1142                                 new_rate = rate;
1143                                 break;
1144                         }
1145                 }
1146         }
1147
1148         return new_rate;
1149 }
1150 #endif                          /* CONFIG_IWL4965_HT */
1151
1152 /*
1153  * Set up search table for MIMO
1154  */
1155 #ifdef CONFIG_IWL4965_HT
1156 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1157                              struct iwl4965_lq_sta *lq_sta,
1158                              struct ieee80211_conf *conf,
1159                              struct sta_info *sta,
1160                              struct iwl4965_scale_tbl_info *tbl, int index)
1161 {
1162         u16 rate_mask;
1163         s32 rate;
1164         s8 is_green = lq_sta->is_green;
1165
1166         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1167             !sta->ht_info.ht_supported)
1168                 return -1;
1169
1170         if (priv->current_ht_config.tx_mimo_ps_mode == IWL_MIMO_PS_STATIC)
1171                 return -1;
1172
1173         /* Need both Tx chains/antennas to support MIMO */
1174         if (priv->hw_params.tx_chains_num < 2)
1175                 return -1;
1176
1177         IWL_DEBUG_RATE("LQ: try to switch to MIMO2\n");
1178
1179         tbl->lq_type = LQ_MIMO2;
1180         tbl->is_dup = lq_sta->is_dup;
1181         tbl->action = 0;
1182         rate_mask = lq_sta->active_mimo2_rate;
1183
1184         if (priv->current_ht_config.supported_chan_width
1185                                         == IWL_CHANNEL_WIDTH_40MHZ)
1186                 tbl->is_fat = 1;
1187         else
1188                 tbl->is_fat = 0;
1189
1190         /* FIXME: - don't toggle SGI here
1191         if (tbl->is_fat) {
1192                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1193                         tbl->is_SGI = 1;
1194                 else
1195                         tbl->is_SGI = 0;
1196         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1197                 tbl->is_SGI = 1;
1198         else
1199                 tbl->is_SGI = 0;
1200         */
1201
1202         rs_set_expected_tpt_table(lq_sta, tbl);
1203
1204         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1205
1206         IWL_DEBUG_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1207
1208         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1209                 IWL_DEBUG_RATE("Can't switch with index %d rate mask %x\n",
1210                                                 rate, rate_mask);
1211                 return -1;
1212         }
1213         tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1214
1215         IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1216                      tbl->current_rate, is_green);
1217         return 0;
1218 }
1219 #else
1220 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1221                              struct iwl4965_lq_sta *lq_sta,
1222                              struct ieee80211_conf *conf,
1223                              struct sta_info *sta,
1224                              struct iwl4965_scale_tbl_info *tbl, int index)
1225 {
1226         return -1;
1227 }
1228 #endif  /*CONFIG_IWL4965_HT */
1229
1230 /*
1231  * Set up search table for SISO
1232  */
1233 static int rs_switch_to_siso(struct iwl_priv *priv,
1234                              struct iwl4965_lq_sta *lq_sta,
1235                              struct ieee80211_conf *conf,
1236                              struct sta_info *sta,
1237                              struct iwl4965_scale_tbl_info *tbl, int index)
1238 {
1239 #ifdef CONFIG_IWL4965_HT
1240         u16 rate_mask;
1241         u8 is_green = lq_sta->is_green;
1242         s32 rate;
1243
1244         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1245             !sta->ht_info.ht_supported)
1246                 return -1;
1247
1248         IWL_DEBUG_RATE("LQ: try to switch to SISO\n");
1249
1250         tbl->is_dup = lq_sta->is_dup;
1251         tbl->lq_type = LQ_SISO;
1252         tbl->action = 0;
1253         rate_mask = lq_sta->active_siso_rate;
1254
1255         if (priv->current_ht_config.supported_chan_width
1256             == IWL_CHANNEL_WIDTH_40MHZ)
1257                 tbl->is_fat = 1;
1258         else
1259                 tbl->is_fat = 0;
1260
1261         /* FIXME: - don't toggle SGI here
1262         if (tbl->is_fat) {
1263                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1264                         tbl->is_SGI = 1;
1265                 else
1266                         tbl->is_SGI = 0;
1267         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1268                 tbl->is_SGI = 1;
1269         else
1270                 tbl->is_SGI = 0;
1271         */
1272
1273         if (is_green)
1274                 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1275
1276         rs_set_expected_tpt_table(lq_sta, tbl);
1277         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1278
1279         IWL_DEBUG_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask);
1280         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1281                 IWL_DEBUG_RATE("can not switch with index %d rate mask %x\n",
1282                              rate, rate_mask);
1283                 return -1;
1284         }
1285         tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1286         IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1287                      tbl->current_rate, is_green);
1288         return 0;
1289 #else
1290         return -1;
1291 #endif  /*CONFIG_IWL4965_HT */
1292 }
1293
1294 /*
1295  * Try to switch to new modulation mode from legacy
1296  */
1297 static int rs_move_legacy_other(struct iwl_priv *priv,
1298                                 struct iwl4965_lq_sta *lq_sta,
1299                                 struct ieee80211_conf *conf,
1300                                 struct sta_info *sta,
1301                                 int index)
1302 {
1303         struct iwl4965_scale_tbl_info *tbl =
1304             &(lq_sta->lq_info[lq_sta->active_tbl]);
1305         struct iwl4965_scale_tbl_info *search_tbl =
1306             &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1307         struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1308         u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1309                   (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1310         u8 start_action = tbl->action;
1311         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1312         int ret = 0;
1313
1314         for (; ;) {
1315                 switch (tbl->action) {
1316                 case IWL_LEGACY_SWITCH_ANTENNA:
1317                         IWL_DEBUG_RATE("LQ: Legacy toggle Antenna\n");
1318
1319                         lq_sta->action_counter++;
1320
1321                         /* Don't change antenna if success has been great */
1322                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1323                                 break;
1324
1325                         /* Set up search table to try other antenna */
1326                         memcpy(search_tbl, tbl, sz);
1327
1328                         if (rs_toggle_antenna(valid_tx_ant,
1329                                 &search_tbl->current_rate, search_tbl)) {
1330                                 lq_sta->search_better_tbl = 1;
1331                                 goto out;
1332                         }
1333
1334                 case IWL_LEGACY_SWITCH_SISO:
1335                         IWL_DEBUG_RATE("LQ: Legacy switch to SISO\n");
1336
1337                         /* Set up search table to try SISO */
1338                         memcpy(search_tbl, tbl, sz);
1339                         search_tbl->is_SGI = 0;
1340                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1341                                                  search_tbl, index);
1342                         if (!ret) {
1343                                 lq_sta->search_better_tbl = 1;
1344                                 lq_sta->action_counter = 0;
1345                                 goto out;
1346                         }
1347
1348                         break;
1349                 case IWL_LEGACY_SWITCH_MIMO2:
1350                         IWL_DEBUG_RATE("LQ: Legacy switch to MIMO2\n");
1351
1352                         /* Set up search table to try MIMO */
1353                         memcpy(search_tbl, tbl, sz);
1354                         search_tbl->is_SGI = 0;
1355                         search_tbl->ant_type = ANT_AB;/*FIXME:RS*/
1356                                 /*FIXME:RS:need to check ant validity*/
1357                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1358                                                  search_tbl, index);
1359                         if (!ret) {
1360                                 lq_sta->search_better_tbl = 1;
1361                                 lq_sta->action_counter = 0;
1362                                 goto out;
1363                         }
1364                         break;
1365                 }
1366                 tbl->action++;
1367                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2)
1368                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1369
1370                 if (tbl->action == start_action)
1371                         break;
1372
1373         }
1374         return 0;
1375
1376  out:
1377         tbl->action++;
1378         if (tbl->action > IWL_LEGACY_SWITCH_MIMO2)
1379                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1380         return 0;
1381
1382 }
1383
1384 /*
1385  * Try to switch to new modulation mode from SISO
1386  */
1387 static int rs_move_siso_to_other(struct iwl_priv *priv,
1388                                  struct iwl4965_lq_sta *lq_sta,
1389                                  struct ieee80211_conf *conf,
1390                                  struct sta_info *sta,
1391                                  int index)
1392 {
1393         u8 is_green = lq_sta->is_green;
1394         struct iwl4965_scale_tbl_info *tbl =
1395             &(lq_sta->lq_info[lq_sta->active_tbl]);
1396         struct iwl4965_scale_tbl_info *search_tbl =
1397             &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1398         struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1399         u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1400                   (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1401         u8 start_action = tbl->action;
1402         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1403         int ret;
1404
1405         for (;;) {
1406                 lq_sta->action_counter++;
1407                 switch (tbl->action) {
1408                 case IWL_SISO_SWITCH_ANTENNA:
1409                         IWL_DEBUG_RATE("LQ: SISO toggle Antenna\n");
1410                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1411                                 break;
1412
1413                         memcpy(search_tbl, tbl, sz);
1414                         if (rs_toggle_antenna(valid_tx_ant,
1415                                        &search_tbl->current_rate, search_tbl)) {
1416                                 lq_sta->search_better_tbl = 1;
1417                                 goto out;
1418                         }
1419
1420                 case IWL_SISO_SWITCH_MIMO2:
1421                         IWL_DEBUG_RATE("LQ: SISO switch to MIMO\n");
1422                         memcpy(search_tbl, tbl, sz);
1423                         search_tbl->is_SGI = 0;
1424                         search_tbl->ant_type = ANT_AB; /*FIXME:RS*/
1425                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1426                                                  search_tbl, index);
1427                         if (!ret) {
1428                                 lq_sta->search_better_tbl = 1;
1429                                 goto out;
1430                         }
1431                         break;
1432                 case IWL_SISO_SWITCH_GI:
1433                         IWL_DEBUG_RATE("LQ: SISO toggle SGI/NGI\n");
1434
1435                         memcpy(search_tbl, tbl, sz);
1436                         if (is_green) {
1437                                 if (!tbl->is_SGI)
1438                                         break;
1439                                 else
1440                                         IWL_ERROR("SGI was set in GF+SISO\n");
1441                         }
1442                         search_tbl->is_SGI = !tbl->is_SGI;
1443                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1444                         if (tbl->is_SGI) {
1445                                 s32 tpt = lq_sta->last_tpt / 100;
1446                                 if (tpt >= search_tbl->expected_tpt[index])
1447                                         break;
1448                         }
1449                         search_tbl->current_rate = rate_n_flags_from_tbl(
1450                                                 search_tbl, index, is_green);
1451                         lq_sta->search_better_tbl = 1;
1452                         goto out;
1453                 }
1454                 tbl->action++;
1455                 if (tbl->action > IWL_SISO_SWITCH_GI)
1456                         tbl->action = IWL_SISO_SWITCH_ANTENNA;
1457
1458                 if (tbl->action == start_action)
1459                         break;
1460         }
1461         return 0;
1462
1463  out:
1464         tbl->action++;
1465         if (tbl->action > IWL_SISO_SWITCH_GI)
1466                 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1467         return 0;
1468 }
1469
1470 /*
1471  * Try to switch to new modulation mode from MIMO
1472  */
1473 static int rs_move_mimo_to_other(struct iwl_priv *priv,
1474                                  struct iwl4965_lq_sta *lq_sta,
1475                                  struct ieee80211_conf *conf,
1476                                  struct sta_info *sta,
1477                                  int index)
1478 {
1479         s8 is_green = lq_sta->is_green;
1480         struct iwl4965_scale_tbl_info *tbl =
1481             &(lq_sta->lq_info[lq_sta->active_tbl]);
1482         struct iwl4965_scale_tbl_info *search_tbl =
1483             &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1484         u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1485                   (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1486         u8 start_action = tbl->action;
1487         /*u8 valid_tx_ant = priv->hw_params.valid_tx_ant;*/
1488         int ret;
1489
1490         for (;;) {
1491                 lq_sta->action_counter++;
1492                 switch (tbl->action) {
1493                 case IWL_MIMO_SWITCH_ANTENNA_A:
1494                 case IWL_MIMO_SWITCH_ANTENNA_B:
1495                         IWL_DEBUG_RATE("LQ: MIMO2 switch to SISO\n");
1496
1497                         /* Set up new search table for SISO */
1498                         memcpy(search_tbl, tbl, sz);
1499
1500                         /*FIXME:RS:need to check ant validity + C*/
1501                         if (tbl->action == IWL_MIMO_SWITCH_ANTENNA_A)
1502                                 search_tbl->ant_type = ANT_A;
1503                         else
1504                                 search_tbl->ant_type = ANT_B;
1505
1506                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1507                                                  search_tbl, index);
1508                         if (!ret) {
1509                                 lq_sta->search_better_tbl = 1;
1510                                 goto out;
1511                         }
1512                         break;
1513
1514                 case IWL_MIMO_SWITCH_GI:
1515                         IWL_DEBUG_RATE("LQ: MIMO toggle SGI/NGI\n");
1516
1517                         /* Set up new search table for MIMO */
1518                         memcpy(search_tbl, tbl, sz);
1519                         search_tbl->is_SGI = !tbl->is_SGI;
1520                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1521                         /*
1522                          * If active table already uses the fastest possible
1523                          * modulation (dual stream with short guard interval),
1524                          * and it's working well, there's no need to look
1525                          * for a better type of modulation!
1526                          */
1527                         if (tbl->is_SGI) {
1528                                 s32 tpt = lq_sta->last_tpt / 100;
1529                                 if (tpt >= search_tbl->expected_tpt[index])
1530                                         break;
1531                         }
1532                         search_tbl->current_rate = rate_n_flags_from_tbl(
1533                                                 search_tbl, index, is_green);
1534                         lq_sta->search_better_tbl = 1;
1535                         goto out;
1536
1537                 }
1538                 tbl->action++;
1539                 if (tbl->action > IWL_MIMO_SWITCH_GI)
1540                         tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1541
1542                 if (tbl->action == start_action)
1543                         break;
1544         }
1545
1546         return 0;
1547  out:
1548         tbl->action++;
1549         if (tbl->action > IWL_MIMO_SWITCH_GI)
1550                 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1551         return 0;
1552
1553 }
1554
1555 /*
1556  * Check whether we should continue using same modulation mode, or
1557  * begin search for a new mode, based on:
1558  * 1) # tx successes or failures while using this mode
1559  * 2) # times calling this function
1560  * 3) elapsed time in this mode (not used, for now)
1561  */
1562 static void rs_stay_in_table(struct iwl4965_lq_sta *lq_sta)
1563 {
1564         struct iwl4965_scale_tbl_info *tbl;
1565         int i;
1566         int active_tbl;
1567         int flush_interval_passed = 0;
1568
1569         active_tbl = lq_sta->active_tbl;
1570
1571         tbl = &(lq_sta->lq_info[active_tbl]);
1572
1573         /* If we've been disallowing search, see if we should now allow it */
1574         if (lq_sta->stay_in_tbl) {
1575
1576                 /* Elapsed time using current modulation mode */
1577                 if (lq_sta->flush_timer)
1578                         flush_interval_passed =
1579                             time_after(jiffies,
1580                                        (unsigned long)(lq_sta->flush_timer +
1581                                         IWL_RATE_SCALE_FLUSH_INTVL));
1582
1583                 /*
1584                  * Check if we should allow search for new modulation mode.
1585                  * If many frames have failed or succeeded, or we've used
1586                  * this same modulation for a long time, allow search, and
1587                  * reset history stats that keep track of whether we should
1588                  * allow a new search.  Also (below) reset all bitmaps and
1589                  * stats in active history.
1590                  */
1591                 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1592                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1593                     ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1594                      && (flush_interval_passed))) {
1595                         IWL_DEBUG_RATE("LQ: stay is expired %d %d %d\n:",
1596                                      lq_sta->total_failed,
1597                                      lq_sta->total_success,
1598                                      flush_interval_passed);
1599
1600                         /* Allow search for new mode */
1601                         lq_sta->stay_in_tbl = 0;        /* only place reset */
1602                         lq_sta->total_failed = 0;
1603                         lq_sta->total_success = 0;
1604                         lq_sta->flush_timer = 0;
1605
1606                 /*
1607                  * Else if we've used this modulation mode enough repetitions
1608                  * (regardless of elapsed time or success/failure), reset
1609                  * history bitmaps and rate-specific stats for all rates in
1610                  * active table.
1611                  */
1612                 } else {
1613                         lq_sta->table_count++;
1614                         if (lq_sta->table_count >=
1615                             lq_sta->table_count_limit) {
1616                                 lq_sta->table_count = 0;
1617
1618                                 IWL_DEBUG_RATE("LQ: stay in table clear win\n");
1619                                 for (i = 0; i < IWL_RATE_COUNT; i++)
1620                                         rs_rate_scale_clear_window(
1621                                                 &(tbl->win[i]));
1622                         }
1623                 }
1624
1625                 /* If transitioning to allow "search", reset all history
1626                  * bitmaps and stats in active table (this will become the new
1627                  * "search" table). */
1628                 if (!lq_sta->stay_in_tbl) {
1629                         for (i = 0; i < IWL_RATE_COUNT; i++)
1630                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1631                 }
1632         }
1633 }
1634
1635 /*
1636  * Do rate scaling and search for new modulation mode.
1637  */
1638 static void rs_rate_scale_perform(struct iwl_priv *priv,
1639                                   struct net_device *dev,
1640                                   struct ieee80211_hdr *hdr,
1641                                   struct sta_info *sta)
1642 {
1643         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1644         struct ieee80211_hw *hw = local_to_hw(local);
1645         struct ieee80211_conf *conf = &hw->conf;
1646         int low = IWL_RATE_INVALID;
1647         int high = IWL_RATE_INVALID;
1648         int index;
1649         int i;
1650         struct iwl4965_rate_scale_data *window = NULL;
1651         int current_tpt = IWL_INVALID_VALUE;
1652         int low_tpt = IWL_INVALID_VALUE;
1653         int high_tpt = IWL_INVALID_VALUE;
1654         u32 fail_count;
1655         s8 scale_action = 0;
1656         u16 fc, rate_mask;
1657         u8 update_lq = 0;
1658         struct iwl4965_lq_sta *lq_sta;
1659         struct iwl4965_scale_tbl_info *tbl, *tbl1;
1660         u16 rate_scale_index_msk = 0;
1661         u32 rate;
1662         u8 is_green = 0;
1663         u8 active_tbl = 0;
1664         u8 done_search = 0;
1665         u16 high_low;
1666 #ifdef CONFIG_IWL4965_HT
1667         u8 tid = MAX_TID_COUNT;
1668         __le16 *qc;
1669 #endif
1670
1671         IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1672
1673         fc = le16_to_cpu(hdr->frame_control);
1674         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
1675                 /* Send management frames and broadcast/multicast data using
1676                  * lowest rate. */
1677                 /* TODO: this could probably be improved.. */
1678                 return;
1679         }
1680
1681         if (!sta || !sta->rate_ctrl_priv)
1682                 return;
1683
1684         if (!priv->lq_mngr.lq_ready) {
1685                 IWL_DEBUG_RATE("still rate scaling not ready\n");
1686                 return;
1687         }
1688         lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
1689
1690 #ifdef CONFIG_IWL4965_HT
1691         qc = ieee80211_get_qos_ctrl(hdr);
1692         if (qc) {
1693                 tid = (u8)(le16_to_cpu(*qc) & 0xf);
1694                 rs_tl_add_packet(lq_sta, tid);
1695         }
1696 #endif
1697         /*
1698          * Select rate-scale / modulation-mode table to work with in
1699          * the rest of this function:  "search" if searching for better
1700          * modulation mode, or "active" if doing rate scaling within a mode.
1701          */
1702         if (!lq_sta->search_better_tbl)
1703                 active_tbl = lq_sta->active_tbl;
1704         else
1705                 active_tbl = 1 - lq_sta->active_tbl;
1706
1707         tbl = &(lq_sta->lq_info[active_tbl]);
1708         is_green = lq_sta->is_green;
1709
1710         /* current tx rate */
1711         index = sta->last_txrate_idx;
1712
1713         IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1714                        tbl->lq_type);
1715
1716         /* rates available for this association, and for modulation mode */
1717         rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
1718
1719         IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1720
1721         /* mask with station rate restriction */
1722         if (is_legacy(tbl->lq_type)) {
1723                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1724                         /* supp_rates has no CCK bits in A mode */
1725                         rate_scale_index_msk = (u16) (rate_mask &
1726                                 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1727                 else
1728                         rate_scale_index_msk = (u16) (rate_mask &
1729                                                       lq_sta->supp_rates);
1730
1731         } else
1732                 rate_scale_index_msk = rate_mask;
1733
1734         if (!rate_scale_index_msk)
1735                 rate_scale_index_msk = rate_mask;
1736
1737         if (!((1 << index) & rate_scale_index_msk)) {
1738                 IWL_ERROR("Current Rate is not valid\n");
1739                 return;
1740         }
1741
1742         /* Get expected throughput table and history window for current rate */
1743         if (!tbl->expected_tpt) {
1744                 IWL_ERROR("tbl->expected_tpt is NULL\n");
1745                 return;
1746         }
1747
1748         window = &(tbl->win[index]);
1749
1750         /*
1751          * If there is not enough history to calculate actual average
1752          * throughput, keep analyzing results of more tx frames, without
1753          * changing rate or mode (bypass most of the rest of this function).
1754          * Set up new rate table in uCode only if old rate is not supported
1755          * in current association (use new rate found above).
1756          */
1757         fail_count = window->counter - window->success_counter;
1758         if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1759                         (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
1760                 IWL_DEBUG_RATE("LQ: still below TH. succ=%d total=%d "
1761                                "for index %d\n",
1762                                window->success_counter, window->counter, index);
1763
1764                 /* Can't calculate this yet; not enough history */
1765                 window->average_tpt = IWL_INVALID_VALUE;
1766
1767                 /* Should we stay with this modulation mode,
1768                  * or search for a new one? */
1769                 rs_stay_in_table(lq_sta);
1770
1771                 goto out;
1772
1773         /* Else we have enough samples; calculate estimate of
1774          * actual average throughput */
1775         } else {
1776                 /*FIXME:RS remove this else if we don't get this error*/
1777                 if (window->average_tpt != ((window->success_ratio *
1778                                 tbl->expected_tpt[index] + 64) / 128)) {
1779                         IWL_ERROR("expected_tpt should have been calculated"
1780                                                                 " by now\n");
1781                         window->average_tpt = ((window->success_ratio *
1782                                         tbl->expected_tpt[index] + 64) / 128);
1783                 }
1784         }
1785
1786         /* If we are searching for better modulation mode, check success. */
1787         if (lq_sta->search_better_tbl) {
1788
1789                 /* If good success, continue using the "search" mode;
1790                  * no need to send new link quality command, since we're
1791                  * continuing to use the setup that we've been trying. */
1792                 if (window->average_tpt > lq_sta->last_tpt) {
1793
1794                         IWL_DEBUG_RATE("LQ: SWITCHING TO CURRENT TABLE "
1795                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
1796                                         window->success_ratio,
1797                                         window->average_tpt,
1798                                         lq_sta->last_tpt);
1799
1800                         if (!is_legacy(tbl->lq_type))
1801                                 lq_sta->enable_counter = 1;
1802
1803                         /* Swap tables; "search" becomes "active" */
1804                         lq_sta->active_tbl = active_tbl;
1805                         current_tpt = window->average_tpt;
1806
1807                 /* Else poor success; go back to mode in "active" table */
1808                 } else {
1809
1810                         IWL_DEBUG_RATE("LQ: GOING BACK TO THE OLD TABLE "
1811                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
1812                                         window->success_ratio,
1813                                         window->average_tpt,
1814                                         lq_sta->last_tpt);
1815
1816                         /* Nullify "search" table */
1817                         tbl->lq_type = LQ_NONE;
1818
1819                         /* Revert to "active" table */
1820                         active_tbl = lq_sta->active_tbl;
1821                         tbl = &(lq_sta->lq_info[active_tbl]);
1822
1823                         /* Revert to "active" rate and throughput info */
1824                         index = iwl4965_hwrate_to_plcp_idx(
1825                                                         tbl->current_rate);
1826                         current_tpt = lq_sta->last_tpt;
1827
1828                         /* Need to set up a new rate table in uCode */
1829                         update_lq = 1;
1830                 }
1831
1832                 /* Either way, we've made a decision; modulation mode
1833                  * search is done, allow rate adjustment next time. */
1834                 lq_sta->search_better_tbl = 0;
1835                 done_search = 1;        /* Don't switch modes below! */
1836                 goto lq_update;
1837         }
1838
1839         /* (Else) not in search of better modulation mode, try for better
1840          * starting rate, while staying in this mode. */
1841         high_low = rs_get_adjacent_rate(index, rate_scale_index_msk,
1842                                         tbl->lq_type);
1843         low = high_low & 0xff;
1844         high = (high_low >> 8) & 0xff;
1845
1846         /* Collect measured throughputs for current and adjacent rates */
1847         current_tpt = window->average_tpt;
1848         if (low != IWL_RATE_INVALID)
1849                 low_tpt = tbl->win[low].average_tpt;
1850         if (high != IWL_RATE_INVALID)
1851                 high_tpt = tbl->win[high].average_tpt;
1852
1853         /* Assume rate increase */
1854         scale_action = 1;
1855
1856         /* Too many failures, decrease rate */
1857         if ((window->success_ratio <= IWL_RATE_DECREASE_TH) ||
1858             (current_tpt == 0)) {
1859                 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1860                 scale_action = -1;
1861
1862         /* No throughput measured yet for adjacent rates; try increase. */
1863         } else if ((low_tpt == IWL_INVALID_VALUE) &&
1864                    (high_tpt == IWL_INVALID_VALUE))
1865                 scale_action = 1;
1866
1867         /* Both adjacent throughputs are measured, but neither one has better
1868          * throughput; we're using the best rate, don't change it! */
1869         else if ((low_tpt != IWL_INVALID_VALUE) &&
1870                  (high_tpt != IWL_INVALID_VALUE) &&
1871                  (low_tpt < current_tpt) &&
1872                  (high_tpt < current_tpt))
1873                 scale_action = 0;
1874
1875         /* At least one adjacent rate's throughput is measured,
1876          * and may have better performance. */
1877         else {
1878                 /* Higher adjacent rate's throughput is measured */
1879                 if (high_tpt != IWL_INVALID_VALUE) {
1880                         /* Higher rate has better throughput */
1881                         if (high_tpt > current_tpt)
1882                                 scale_action = 1;
1883                         else {
1884                                 IWL_DEBUG_RATE
1885                                     ("decrease rate because of high tpt\n");
1886                                 scale_action = -1;
1887                         }
1888
1889                 /* Lower adjacent rate's throughput is measured */
1890                 } else if (low_tpt != IWL_INVALID_VALUE) {
1891                         /* Lower rate has better throughput */
1892                         if (low_tpt > current_tpt) {
1893                                 IWL_DEBUG_RATE
1894                                     ("decrease rate because of low tpt\n");
1895                                 scale_action = -1;
1896                         } else
1897                                 scale_action = 1;
1898                 }
1899         }
1900
1901         /* Sanity check; asked for decrease, but success rate or throughput
1902          * has been good at old rate.  Don't change it. */
1903         if (scale_action == -1) {
1904                 if ((low != IWL_RATE_INVALID) &&
1905                     ((window->success_ratio > IWL_RATE_HIGH_TH) ||
1906                      (current_tpt > (100 * tbl->expected_tpt[low]))))
1907                         scale_action = 0;
1908
1909         /* Sanity check; asked for increase, but success rate has not been great
1910          * even at old rate, higher rate will be worse.  Don't change it. */
1911         } else if ((scale_action == 1) &&
1912                    (window->success_ratio < IWL_RATE_INCREASE_TH))
1913                 scale_action = 0;
1914
1915         switch (scale_action) {
1916         case -1:
1917                 /* Decrease starting rate, update uCode's rate table */
1918                 if (low != IWL_RATE_INVALID) {
1919                         update_lq = 1;
1920                         index = low;
1921                 }
1922                 break;
1923         case 1:
1924                 /* Increase starting rate, update uCode's rate table */
1925                 if (high != IWL_RATE_INVALID) {
1926                         update_lq = 1;
1927                         index = high;
1928                 }
1929
1930                 break;
1931         case 0:
1932                 /* No change */
1933         default:
1934                 break;
1935         }
1936
1937         IWL_DEBUG_RATE("choose rate scale index %d action %d low %d "
1938                     "high %d type %d\n",
1939                      index, scale_action, low, high, tbl->lq_type);
1940
1941  lq_update:
1942         /* Replace uCode's rate table for the destination station. */
1943         if (update_lq) {
1944                 rate = rate_n_flags_from_tbl(tbl, index, is_green);
1945                 rs_fill_link_cmd(priv, lq_sta, rate);
1946                 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1947         }
1948
1949         /* Should we stay with this modulation mode, or search for a new one? */
1950         rs_stay_in_table(lq_sta);
1951
1952         /*
1953          * Search for new modulation mode if we're:
1954          * 1)  Not changing rates right now
1955          * 2)  Not just finishing up a search
1956          * 3)  Allowing a new search
1957          */
1958         if (!update_lq && !done_search && !lq_sta->stay_in_tbl) {
1959                 /* Save current throughput to compare with "search" throughput*/
1960                 lq_sta->last_tpt = current_tpt;
1961
1962                 /* Select a new "search" modulation mode to try.
1963                  * If one is found, set up the new "search" table. */
1964                 if (is_legacy(tbl->lq_type))
1965                         rs_move_legacy_other(priv, lq_sta, conf, sta, index);
1966                 else if (is_siso(tbl->lq_type))
1967                         rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
1968                 else
1969                         rs_move_mimo_to_other(priv, lq_sta, conf, sta, index);
1970
1971                 /* If new "search" mode was selected, set up in uCode table */
1972                 if (lq_sta->search_better_tbl) {
1973                         /* Access the "search" table, clear its history. */
1974                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1975                         for (i = 0; i < IWL_RATE_COUNT; i++)
1976                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1977
1978                         /* Use new "search" start rate */
1979                         index = iwl4965_hwrate_to_plcp_idx(
1980                                                         tbl->current_rate);
1981
1982                         IWL_DEBUG_RATE("Switch current  mcs: %X index: %d\n",
1983                                      tbl->current_rate, index);
1984                         rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
1985                         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1986                 }
1987
1988                 /* If the "active" (non-search) mode was legacy,
1989                  * and we've tried switching antennas,
1990                  * but we haven't been able to try HT modes (not available),
1991                  * stay with best antenna legacy modulation for a while
1992                  * before next round of mode comparisons. */
1993                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
1994                 if (is_legacy(tbl1->lq_type) &&
1995 #ifdef CONFIG_IWL4965_HT
1996                    (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)) &&
1997 #endif
1998                     (lq_sta->action_counter >= 1)) {
1999                         lq_sta->action_counter = 0;
2000                         IWL_DEBUG_RATE("LQ: STAY in legacy table\n");
2001                         rs_set_stay_in_table(1, lq_sta);
2002                 }
2003
2004                 /* If we're in an HT mode, and all 3 mode switch actions
2005                  * have been tried and compared, stay in this best modulation
2006                  * mode for a while before next round of mode comparisons. */
2007                 if (lq_sta->enable_counter &&
2008                     (lq_sta->action_counter >= IWL_ACTION_LIMIT)) {
2009 #ifdef CONFIG_IWL4965_HT
2010                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2011                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2012                             (tid != MAX_TID_COUNT)) {
2013                                 IWL_DEBUG_RATE("try to aggregate tid %d\n", tid);
2014                                 rs_tl_turn_on_agg(priv, tid, lq_sta, sta);
2015                         }
2016 #endif /*CONFIG_IWL4965_HT */
2017                         lq_sta->action_counter = 0;
2018                         rs_set_stay_in_table(0, lq_sta);
2019                 }
2020
2021         /*
2022          * Else, don't search for a new modulation mode.
2023          * Put new timestamp in stay-in-modulation-mode flush timer if:
2024          * 1)  Not changing rates right now
2025          * 2)  Not just finishing up a search
2026          * 3)  flush timer is empty
2027          */
2028         } else {
2029                 if ((!update_lq) && (!done_search) && (!lq_sta->flush_timer))
2030                         lq_sta->flush_timer = jiffies;
2031         }
2032
2033 out:
2034         tbl->current_rate = rate_n_flags_from_tbl(tbl, index, is_green);
2035         i = index;
2036         sta->last_txrate_idx = i;
2037
2038         /* sta->txrate_idx is an index to A mode rates which start
2039          * at IWL_FIRST_OFDM_RATE
2040          */
2041         if (lq_sta->band == IEEE80211_BAND_5GHZ)
2042                 sta->txrate_idx = i - IWL_FIRST_OFDM_RATE;
2043         else
2044                 sta->txrate_idx = i;
2045
2046         return;
2047 }
2048
2049
2050 static void rs_initialize_lq(struct iwl_priv *priv,
2051                              struct ieee80211_conf *conf,
2052                              struct sta_info *sta)
2053 {
2054         struct iwl4965_lq_sta *lq_sta;
2055         struct iwl4965_scale_tbl_info *tbl;
2056         int rate_idx;
2057         int i;
2058         u32 rate;
2059         u8 use_green = rs_use_green(priv, conf);
2060         u8 active_tbl = 0;
2061         u8 valid_tx_ant;
2062
2063         if (!sta || !sta->rate_ctrl_priv)
2064                 goto out;
2065
2066         lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
2067         i = sta->last_txrate_idx;
2068
2069         if ((lq_sta->lq.sta_id == 0xff) &&
2070             (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
2071                 goto out;
2072
2073         valid_tx_ant = priv->hw_params.valid_tx_ant;
2074
2075         if (!lq_sta->search_better_tbl)
2076                 active_tbl = lq_sta->active_tbl;
2077         else
2078                 active_tbl = 1 - lq_sta->active_tbl;
2079
2080         tbl = &(lq_sta->lq_info[active_tbl]);
2081
2082         if ((i < 0) || (i >= IWL_RATE_COUNT))
2083                 i = 0;
2084
2085         /* FIXME:RS: This is also wrong in 4965 */
2086         rate = iwl4965_rates[i].plcp;
2087         rate |= RATE_MCS_ANT_B_MSK;
2088         rate &= ~RATE_MCS_ANT_A_MSK;
2089
2090         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2091                 rate |= RATE_MCS_CCK_MSK;
2092
2093         tbl->ant_type = ANT_B;
2094         rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2095         if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2096             rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2097
2098         rate = rate_n_flags_from_tbl(tbl, rate_idx, use_green);
2099         tbl->current_rate = rate;
2100         rs_set_expected_tpt_table(lq_sta, tbl);
2101         rs_fill_link_cmd(NULL, lq_sta, rate);
2102         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2103  out:
2104         return;
2105 }
2106
2107 static void rs_get_rate(void *priv_rate, struct net_device *dev,
2108                         struct ieee80211_supported_band *sband,
2109                         struct sk_buff *skb,
2110                         struct rate_selection *sel)
2111 {
2112
2113         int i;
2114         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2115         struct ieee80211_conf *conf = &local->hw.conf;
2116         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2117         struct sta_info *sta;
2118         u16 fc;
2119         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
2120         struct iwl4965_lq_sta *lq_sta;
2121
2122         IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2123
2124         rcu_read_lock();
2125
2126         sta = sta_info_get(local, hdr->addr1);
2127
2128         /* Send management frames and broadcast/multicast data using lowest
2129          * rate. */
2130         fc = le16_to_cpu(hdr->frame_control);
2131         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1) ||
2132             !sta || !sta->rate_ctrl_priv) {
2133                 sel->rate = rate_lowest(local, sband, sta);
2134                 goto out;
2135         }
2136
2137         lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
2138         i = sta->last_txrate_idx;
2139
2140         if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
2141             !lq_sta->ibss_sta_added) {
2142                 u8 sta_id = iwl_find_station(priv, hdr->addr1);
2143                 DECLARE_MAC_BUF(mac);
2144
2145                 if (sta_id == IWL_INVALID_STATION) {
2146                         IWL_DEBUG_RATE("LQ: ADD station %s\n",
2147                                        print_mac(mac, hdr->addr1));
2148                         sta_id = iwl4965_add_station_flags(priv, hdr->addr1,
2149                                                         0, CMD_ASYNC, NULL);
2150                 }
2151                 if ((sta_id != IWL_INVALID_STATION)) {
2152                         lq_sta->lq.sta_id = sta_id;
2153                         lq_sta->lq.rs_table[0].rate_n_flags = 0;
2154                         lq_sta->ibss_sta_added = 1;
2155                         rs_initialize_lq(priv, conf, sta);
2156                 }
2157                 if (!lq_sta->ibss_sta_added)
2158                         goto done;
2159         }
2160
2161 done:
2162         if ((i < 0) || (i > IWL_RATE_COUNT)) {
2163                 sel->rate = rate_lowest(local, sband, sta);
2164                 goto out;
2165         }
2166
2167         sel->rate = &priv->ieee_rates[i];
2168 out:
2169         rcu_read_unlock();
2170 }
2171
2172 static void *rs_alloc_sta(void *priv, gfp_t gfp)
2173 {
2174         struct iwl4965_lq_sta *lq_sta;
2175         int i, j;
2176
2177         IWL_DEBUG_RATE("create station rate scale window\n");
2178
2179         lq_sta = kzalloc(sizeof(struct iwl4965_lq_sta), gfp);
2180
2181         if (lq_sta == NULL)
2182                 return NULL;
2183         lq_sta->lq.sta_id = 0xff;
2184
2185
2186         for (j = 0; j < LQ_SIZE; j++)
2187                 for (i = 0; i < IWL_RATE_COUNT; i++)
2188                         rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
2189
2190         return lq_sta;
2191 }
2192
2193 static void rs_rate_init(void *priv_rate, void *priv_sta,
2194                          struct ieee80211_local *local,
2195                          struct sta_info *sta)
2196 {
2197         int i, j;
2198         struct ieee80211_conf *conf = &local->hw.conf;
2199         struct ieee80211_supported_band *sband;
2200         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
2201         struct iwl4965_lq_sta *lq_sta = priv_sta;
2202
2203         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2204
2205         lq_sta->flush_timer = 0;
2206         lq_sta->supp_rates = sta->supp_rates[sband->band];
2207         sta->txrate_idx = 3;
2208         for (j = 0; j < LQ_SIZE; j++)
2209                 for (i = 0; i < IWL_RATE_COUNT; i++)
2210                         rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
2211
2212         IWL_DEBUG_RATE("LQ: *** rate scale global init ***\n");
2213         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2214          * the lowest or the highest rate.. Could consider using RSSI from
2215          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2216          * after assoc.. */
2217
2218         lq_sta->ibss_sta_added = 0;
2219         if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
2220                 u8 sta_id = iwl_find_station(priv, sta->addr);
2221                 DECLARE_MAC_BUF(mac);
2222
2223                 /* for IBSS the call are from tasklet */
2224                 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2225                              print_mac(mac, sta->addr));
2226
2227                 if (sta_id == IWL_INVALID_STATION) {
2228                         IWL_DEBUG_RATE("LQ: ADD station %s\n",
2229                                        print_mac(mac, sta->addr));
2230                         sta_id = iwl4965_add_station_flags(priv, sta->addr,
2231                                                         0, CMD_ASYNC, NULL);
2232                 }
2233                 if ((sta_id != IWL_INVALID_STATION)) {
2234                         lq_sta->lq.sta_id = sta_id;
2235                         lq_sta->lq.rs_table[0].rate_n_flags = 0;
2236                 }
2237                 /* FIXME: this is w/a remove it later */
2238                 priv->assoc_station_added = 1;
2239         }
2240
2241         /* Find highest tx rate supported by hardware and destination station */
2242         for (i = 0; i < sband->n_bitrates; i++)
2243                 if (sta->supp_rates[sband->band] & BIT(i))
2244                         sta->txrate_idx = i;
2245
2246         sta->last_txrate_idx = sta->txrate_idx;
2247         /* WTF is with this bogus comment? A doesn't have cck rates */
2248         /* For MODE_IEEE80211A, cck rates are at end of rate table */
2249         if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
2250                 sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2251
2252         lq_sta->is_dup = 0;
2253         lq_sta->is_green = rs_use_green(priv, conf);
2254         lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2255         lq_sta->active_rate_basic = priv->active_rate_basic;
2256         lq_sta->band = priv->band;
2257 #ifdef CONFIG_IWL4965_HT
2258         /*
2259          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2260          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2261          */
2262         lq_sta->active_siso_rate =
2263                 priv->current_ht_config.supp_mcs_set[0] << 1;
2264         lq_sta->active_siso_rate |=
2265                 priv->current_ht_config.supp_mcs_set[0] & 0x1;
2266         lq_sta->active_siso_rate &= ~((u16)0x2);
2267         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2268
2269         /* Same here */
2270         lq_sta->active_mimo2_rate =
2271                 priv->current_ht_config.supp_mcs_set[1] << 1;
2272         lq_sta->active_mimo2_rate |=
2273                 priv->current_ht_config.supp_mcs_set[1] & 0x1;
2274         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2275         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2276
2277         lq_sta->active_mimo3_rate =
2278                 priv->current_ht_config.supp_mcs_set[2] << 1;
2279         lq_sta->active_mimo3_rate |=
2280                 priv->current_ht_config.supp_mcs_set[2] & 0x1;
2281         lq_sta->active_mimo3_rate &= ~((u16)0x2);
2282         lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2283
2284         IWL_DEBUG_RATE("SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2285                      lq_sta->active_siso_rate,
2286                      lq_sta->active_mimo2_rate,
2287                      lq_sta->active_mimo3_rate);
2288
2289         /* These values will be overriden later */
2290         lq_sta->lq.general_params.single_stream_ant_msk = ANT_A;
2291         lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2292
2293         /* as default allow aggregation for all tids */
2294         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2295 #endif /*CONFIG_IWL4965_HT*/
2296 #ifdef CONFIG_MAC80211_DEBUGFS
2297         lq_sta->drv = priv;
2298 #endif
2299
2300         if (priv->assoc_station_added)
2301                 priv->lq_mngr.lq_ready = 1;
2302
2303         rs_initialize_lq(priv, conf, sta);
2304 }
2305
2306 static void rs_fill_link_cmd(const struct iwl_priv *priv,
2307                              struct iwl4965_lq_sta *lq_sta,
2308                              u32 new_rate)
2309 {
2310         struct iwl4965_scale_tbl_info tbl_type;
2311         int index = 0;
2312         int rate_idx;
2313         int repeat_rate = 0;
2314         u8 ant_toggle_cnt = 0;
2315         u8 use_ht_possible = 1;
2316         u8 valid_tx_ant = 0;
2317         struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2318
2319         /* Override starting rate (index 0) if needed for debug purposes */
2320         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2321
2322         /* Interpret new_rate (rate_n_flags) */
2323         memset(&tbl_type, 0, sizeof(tbl_type));
2324         rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2325                                   &tbl_type, &rate_idx);
2326
2327         /* How many times should we repeat the initial rate? */
2328         if (is_legacy(tbl_type.lq_type)) {
2329                 ant_toggle_cnt = 1;
2330                 repeat_rate = IWL_NUMBER_TRY;
2331         } else {
2332                 repeat_rate = IWL_HT_NUMBER_TRY;
2333         }
2334
2335         lq_cmd->general_params.mimo_delimiter =
2336                         is_mimo(tbl_type.lq_type) ? 1 : 0;
2337
2338         /* Fill 1st table entry (index 0) */
2339         lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2340
2341         if (num_of_ant(tbl_type.ant_type) == 1) {
2342                 lq_cmd->general_params.single_stream_ant_msk =
2343                                                 tbl_type.ant_type;
2344         } else if (num_of_ant(tbl_type.ant_type) == 2) {
2345                 lq_cmd->general_params.dual_stream_ant_msk =
2346                                                 tbl_type.ant_type;
2347         } /* otherwise we don't modify the existing value */
2348
2349         index++;
2350         repeat_rate--;
2351
2352         if (priv)
2353                 valid_tx_ant = priv->hw_params.valid_tx_ant;
2354
2355         /* Fill rest of rate table */
2356         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2357                 /* Repeat initial/next rate.
2358                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2359                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2360                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2361                         if (is_legacy(tbl_type.lq_type)) {
2362                                 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2363                                         ant_toggle_cnt++;
2364                                 else if (priv &&
2365                                          rs_toggle_antenna(valid_tx_ant,
2366                                                         &new_rate, &tbl_type))
2367                                         ant_toggle_cnt = 1;
2368 }
2369
2370                         /* Override next rate if needed for debug purposes */
2371                         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2372
2373                         /* Fill next table entry */
2374                         lq_cmd->rs_table[index].rate_n_flags =
2375                                         cpu_to_le32(new_rate);
2376                         repeat_rate--;
2377                         index++;
2378                 }
2379
2380                 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2381                                                 &rate_idx);
2382
2383                 /* Indicate to uCode which entries might be MIMO.
2384                  * If initial rate was MIMO, this will finally end up
2385                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2386                 if (is_mimo(tbl_type.lq_type))
2387                         lq_cmd->general_params.mimo_delimiter = index;
2388
2389                 /* Get next rate */
2390                 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2391                                              use_ht_possible);
2392
2393                 /* How many times should we repeat the next rate? */
2394                 if (is_legacy(tbl_type.lq_type)) {
2395                         if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2396                                 ant_toggle_cnt++;
2397                         else if (priv &&
2398                                  rs_toggle_antenna(valid_tx_ant,
2399                                                    &new_rate, &tbl_type))
2400                                 ant_toggle_cnt = 1;
2401
2402                         repeat_rate = IWL_NUMBER_TRY;
2403                 } else {
2404                         repeat_rate = IWL_HT_NUMBER_TRY;
2405                 }
2406
2407                 /* Don't allow HT rates after next pass.
2408                  * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2409                 use_ht_possible = 0;
2410
2411                 /* Override next rate if needed for debug purposes */
2412                 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2413
2414                 /* Fill next table entry */
2415                 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2416
2417                 index++;
2418                 repeat_rate--;
2419         }
2420
2421         lq_cmd->agg_params.agg_dis_start_th = 3;
2422         lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
2423 }
2424
2425 static void *rs_alloc(struct ieee80211_local *local)
2426 {
2427         return local->hw.priv;
2428 }
2429 /* rate scale requires free function to be implemented */
2430 static void rs_free(void *priv_rate)
2431 {
2432         return;
2433 }
2434
2435 static void rs_clear(void *priv_rate)
2436 {
2437         struct iwl_priv *priv = (struct iwl_priv *) priv_rate;
2438
2439         IWL_DEBUG_RATE("enter\n");
2440
2441         priv->lq_mngr.lq_ready = 0;
2442
2443         IWL_DEBUG_RATE("leave\n");
2444 }
2445
2446 static void rs_free_sta(void *priv, void *priv_sta)
2447 {
2448         struct iwl4965_lq_sta *lq_sta = priv_sta;
2449
2450         IWL_DEBUG_RATE("enter\n");
2451         kfree(lq_sta);
2452         IWL_DEBUG_RATE("leave\n");
2453 }
2454
2455
2456 #ifdef CONFIG_MAC80211_DEBUGFS
2457 static int open_file_generic(struct inode *inode, struct file *file)
2458 {
2459         file->private_data = inode->i_private;
2460         return 0;
2461 }
2462 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
2463                                 u32 *rate_n_flags, int index)
2464 {
2465         if (lq_sta->dbg_fixed_rate) {
2466                 if (index < 12) {
2467                         *rate_n_flags = lq_sta->dbg_fixed_rate;
2468                 } else {
2469                         if (lq_sta->band == IEEE80211_BAND_5GHZ)
2470                                 *rate_n_flags = 0x800D;
2471                         else
2472                                 *rate_n_flags = 0x820A;
2473                 }
2474                 IWL_DEBUG_RATE("Fixed rate ON\n");
2475         } else {
2476                 IWL_DEBUG_RATE("Fixed rate OFF\n");
2477         }
2478 }
2479
2480 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2481                         const char __user *user_buf, size_t count, loff_t *ppos)
2482 {
2483         struct iwl4965_lq_sta *lq_sta = file->private_data;
2484         char buf[64];
2485         int buf_size;
2486         u32 parsed_rate;
2487
2488         memset(buf, 0, sizeof(buf));
2489         buf_size = min(count, sizeof(buf) -  1);
2490         if (copy_from_user(buf, user_buf, buf_size))
2491                 return -EFAULT;
2492
2493         if (sscanf(buf, "%x", &parsed_rate) == 1)
2494                 lq_sta->dbg_fixed_rate = parsed_rate;
2495         else
2496                 lq_sta->dbg_fixed_rate = 0;
2497
2498         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
2499         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2500         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2501         lq_sta->active_mimo3_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2502
2503         IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2504                 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2505
2506         if (lq_sta->dbg_fixed_rate) {
2507                 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2508                 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2509         }
2510
2511         return count;
2512 }
2513
2514 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2515                         char __user *user_buf, size_t count, loff_t *ppos)
2516 {
2517         char buff[1024];
2518         int desc = 0;
2519         int i = 0;
2520
2521         struct iwl4965_lq_sta *lq_sta = file->private_data;
2522
2523         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2524         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2525                         lq_sta->total_failed, lq_sta->total_success,
2526                         lq_sta->active_legacy_rate);
2527         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2528                         lq_sta->dbg_fixed_rate);
2529         desc += sprintf(buff+desc, "general:"
2530                 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2531                 lq_sta->lq.general_params.flags,
2532                 lq_sta->lq.general_params.mimo_delimiter,
2533                 lq_sta->lq.general_params.single_stream_ant_msk,
2534                 lq_sta->lq.general_params.dual_stream_ant_msk);
2535
2536         desc += sprintf(buff+desc, "agg:"
2537                         "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2538                         le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2539                         lq_sta->lq.agg_params.agg_dis_start_th,
2540                         lq_sta->lq.agg_params.agg_frame_cnt_limit);
2541
2542         desc += sprintf(buff+desc,
2543                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2544                         lq_sta->lq.general_params.start_rate_index[0],
2545                         lq_sta->lq.general_params.start_rate_index[1],
2546                         lq_sta->lq.general_params.start_rate_index[2],
2547                         lq_sta->lq.general_params.start_rate_index[3]);
2548
2549
2550         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2551                 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
2552                         i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2553
2554         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2555 }
2556
2557 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2558         .write = rs_sta_dbgfs_scale_table_write,
2559         .read = rs_sta_dbgfs_scale_table_read,
2560         .open = open_file_generic,
2561 };
2562 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2563                         char __user *user_buf, size_t count, loff_t *ppos)
2564 {
2565         char buff[1024];
2566         int desc = 0;
2567         int i, j;
2568
2569         struct iwl4965_lq_sta *lq_sta = file->private_data;
2570         for (i = 0; i < LQ_SIZE; i++) {
2571                 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2572                                 "rate=0x%X\n",
2573                                 lq_sta->active_tbl == i?"*":"x",
2574                                 lq_sta->lq_info[i].lq_type,
2575                                 lq_sta->lq_info[i].is_SGI,
2576                                 lq_sta->lq_info[i].is_fat,
2577                                 lq_sta->lq_info[i].is_dup,
2578                                 lq_sta->lq_info[i].current_rate);
2579                 for (j = 0; j < IWL_RATE_COUNT; j++) {
2580                         desc += sprintf(buff+desc,
2581                                 "counter=%d success=%d %%=%d\n",
2582                                 lq_sta->lq_info[i].win[j].counter,
2583                                 lq_sta->lq_info[i].win[j].success_counter,
2584                                 lq_sta->lq_info[i].win[j].success_ratio);
2585                 }
2586         }
2587         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2588 }
2589
2590 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2591         .read = rs_sta_dbgfs_stats_table_read,
2592         .open = open_file_generic,
2593 };
2594
2595 static void rs_add_debugfs(void *priv, void *priv_sta,
2596                                         struct dentry *dir)
2597 {
2598         struct iwl4965_lq_sta *lq_sta = priv_sta;
2599         lq_sta->rs_sta_dbgfs_scale_table_file =
2600                 debugfs_create_file("rate_scale_table", 0600, dir,
2601                                 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2602         lq_sta->rs_sta_dbgfs_stats_table_file =
2603                 debugfs_create_file("rate_stats_table", 0600, dir,
2604                         lq_sta, &rs_sta_dbgfs_stats_table_ops);
2605 #ifdef CONFIG_IWL4965_HT
2606         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2607                 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
2608                 &lq_sta->tx_agg_tid_en);
2609 #endif
2610
2611 }
2612
2613 static void rs_remove_debugfs(void *priv, void *priv_sta)
2614 {
2615         struct iwl4965_lq_sta *lq_sta = priv_sta;
2616         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2617         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2618 #ifdef CONFIG_IWL4965_HT
2619         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2620 #endif
2621 }
2622 #endif
2623
2624 static struct rate_control_ops rs_ops = {
2625         .module = NULL,
2626         .name = RS_NAME,
2627         .tx_status = rs_tx_status,
2628         .get_rate = rs_get_rate,
2629         .rate_init = rs_rate_init,
2630         .clear = rs_clear,
2631         .alloc = rs_alloc,
2632         .free = rs_free,
2633         .alloc_sta = rs_alloc_sta,
2634         .free_sta = rs_free_sta,
2635 #ifdef CONFIG_MAC80211_DEBUGFS
2636         .add_sta_debugfs = rs_add_debugfs,
2637         .remove_sta_debugfs = rs_remove_debugfs,
2638 #endif
2639 };
2640
2641 int iwl4965_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id)
2642 {
2643         struct ieee80211_local *local = hw_to_local(hw);
2644         struct iwl_priv *priv = hw->priv;
2645         struct iwl4965_lq_sta *lq_sta;
2646         struct sta_info *sta;
2647         int cnt = 0, i;
2648         u32 samples = 0, success = 0, good = 0;
2649         unsigned long now = jiffies;
2650         u32 max_time = 0;
2651         u8 lq_type, antenna;
2652
2653         rcu_read_lock();
2654
2655         sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
2656         if (!sta || !sta->rate_ctrl_priv) {
2657                 if (sta)
2658                         IWL_DEBUG_RATE("leave - no private rate data!\n");
2659                 else
2660                         IWL_DEBUG_RATE("leave - no station!\n");
2661                 rcu_read_unlock();
2662                 return sprintf(buf, "station %d not found\n", sta_id);
2663         }
2664
2665         lq_sta = (void *)sta->rate_ctrl_priv;
2666
2667         lq_type = lq_sta->lq_info[lq_sta->active_tbl].lq_type;
2668         antenna = lq_sta->lq_info[lq_sta->active_tbl].ant_type;
2669
2670         if (is_legacy(lq_type))
2671                 i = IWL_RATE_54M_INDEX;
2672         else
2673                 i = IWL_RATE_60M_INDEX;
2674         while (1) {
2675                 u64 mask;
2676                 int j;
2677                 int active = lq_sta->active_tbl;
2678
2679                 cnt +=
2680                     sprintf(&buf[cnt], " %2dMbs: ", iwl4965_rates[i].ieee / 2);
2681
2682                 mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1));
2683                 for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1)
2684                         buf[cnt++] =
2685                                 (lq_sta->lq_info[active].win[i].data & mask)
2686                                 ? '1' : '0';
2687
2688                 samples += lq_sta->lq_info[active].win[i].counter;
2689                 good += lq_sta->lq_info[active].win[i].success_counter;
2690                 success += lq_sta->lq_info[active].win[i].success_counter *
2691                            iwl4965_rates[i].ieee;
2692
2693                 if (lq_sta->lq_info[active].win[i].stamp) {
2694                         int delta =
2695                                    jiffies_to_msecs(now -
2696                                    lq_sta->lq_info[active].win[i].stamp);
2697
2698                         if (delta > max_time)
2699                                 max_time = delta;
2700
2701                         cnt += sprintf(&buf[cnt], "%5dms\n", delta);
2702                 } else
2703                         buf[cnt++] = '\n';
2704
2705                 j = iwl4965_get_prev_ieee_rate(i);
2706                 if (j == i)
2707                         break;
2708                 i = j;
2709         }
2710
2711         /* Display the average rate of all samples taken.
2712          *
2713          * NOTE:  We multiply # of samples by 2 since the IEEE measurement
2714          * added from iwl4965_rates is actually 2X the rate */
2715         if (samples)
2716                 cnt += sprintf(&buf[cnt],
2717                          "\nAverage rate is %3d.%02dMbs over last %4dms\n"
2718                          "%3d%% success (%d good packets over %d tries)\n",
2719                          success / (2 * samples), (success * 5 / samples) % 10,
2720                          max_time, good * 100 / samples, good, samples);
2721         else
2722                 cnt += sprintf(&buf[cnt], "\nAverage rate: 0Mbs\n");
2723
2724         cnt += sprintf(&buf[cnt], "\nrate scale type %d antenna %d "
2725                          "active_search %d rate index %d\n", lq_type, antenna,
2726                          lq_sta->search_better_tbl, sta->last_txrate_idx);
2727
2728         rcu_read_unlock();
2729         return cnt;
2730 }
2731
2732 void iwl4965_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
2733 {
2734         struct iwl_priv *priv = hw->priv;
2735
2736         priv->lq_mngr.lq_ready = 1;
2737 }
2738
2739 int iwl4965_rate_control_register(void)
2740 {
2741         return ieee80211_rate_control_register(&rs_ops);
2742 }
2743
2744 void iwl4965_rate_control_unregister(void)
2745 {
2746         ieee80211_rate_control_unregister(&rs_ops);
2747 }
2748