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