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