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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2011 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  *  Intel Linux Wireless <ilw@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/slab.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 "iwl-dev.h"
  39 #include "iwl-sta.h"
  40 #include "iwl-core.h"
  41 #include "iwl-4965.h"
  42
  43 #define IWL4965_RS_NAME "iwl-4965-rs"
  44
  45 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
  46 #define IWL_NUMBER_TRY      1
  47 #define IWL_HT_NUMBER_TRY   3
  48
  49 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  50 #define IWL_RATE_MIN_FAILURE_TH         6       /* min failures to calc tpt */
  51 #define IWL_RATE_MIN_SUCCESS_TH         8       /* min successes to calc tpt */
  52
  53 /* max allowed rate miss before sync LQ cmd */
  54 #define IWL_MISSED_RATE_MAX             15
  55 /* max time to accum history 2 seconds */
  56 #define IWL_RATE_SCALE_FLUSH_INTVL   (3*HZ)
  57
  58 static u8 rs_ht_to_legacy[] = {
  59         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  60         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  61         IWL_RATE_6M_INDEX,
  62         IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
  63         IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
  64         IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
  65         IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
  66 };
  67
  68 static const u8 ant_toggle_lookup[] = {
  69         /*ANT_NONE -> */ ANT_NONE,
  70         /*ANT_A    -> */ ANT_B,
  71         /*ANT_B    -> */ ANT_C,
  72         /*ANT_AB   -> */ ANT_BC,
  73         /*ANT_C    -> */ ANT_A,
  74         /*ANT_AC   -> */ ANT_AB,
  75         /*ANT_BC   -> */ ANT_AC,
  76         /*ANT_ABC  -> */ ANT_ABC,
  77 };
  78
  79 #define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np)    \
  80         [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,      \
  81                                     IWL_RATE_SISO_##s##M_PLCP, \
  82                                     IWL_RATE_MIMO2_##s##M_PLCP,\
  83                                     IWL_RATE_##r##M_IEEE,      \
  84                                     IWL_RATE_##ip##M_INDEX,    \
  85                                     IWL_RATE_##in##M_INDEX,    \
  86                                     IWL_RATE_##rp##M_INDEX,    \
  87                                     IWL_RATE_##rn##M_INDEX,    \
  88                                     IWL_RATE_##pp##M_INDEX,    \
  89                                     IWL_RATE_##np##M_INDEX }
  90
  91 /*
  92  * Parameter order:
  93  *   rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
  94  *
  95  * If there isn't a valid next or previous rate then INV is used which
  96  * maps to IWL_RATE_INVALID
  97  *
  98  */
  99 const struct iwl_rate_info iwlegacy_rates[IWL_RATE_COUNT] = {
 100         IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2),    /*  1mbps */
 101         IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5),          /*  2mbps */
 102         IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11),        /*5.5mbps */
 103         IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18),      /* 11mbps */
 104         IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11),        /*  6mbps */
 105         IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11),       /*  9mbps */
 106         IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18),   /* 12mbps */
 107         IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24),   /* 18mbps */
 108         IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36),   /* 24mbps */
 109         IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48),   /* 36mbps */
 110         IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54),   /* 48mbps */
 111         IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
 112         IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
 113 };
 114
 115 static int iwl4965_hwrate_to_plcp_idx(u32 rate_n_flags)
 116 {
 117         int idx = 0;
 118
 119         /* HT rate format */
 120         if (rate_n_flags & RATE_MCS_HT_MSK) {
 121                 idx = (rate_n_flags & 0xff);
 122
 123                 if (idx >= IWL_RATE_MIMO2_6M_PLCP)
 124                         idx = idx - IWL_RATE_MIMO2_6M_PLCP;
 125
 126                 idx += IWL_FIRST_OFDM_RATE;
 127                 /* skip 9M not supported in ht*/
 128                 if (idx >= IWL_RATE_9M_INDEX)
 129                         idx += 1;
 130                 if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE))
 131                         return idx;
 132
 133         /* legacy rate format, search for match in table */
 134         } else {
 135                 for (idx = 0; idx < ARRAY_SIZE(iwlegacy_rates); idx++)
 136                         if (iwlegacy_rates[idx].plcp == (rate_n_flags & 0xFF))
 137                                 return idx;
 138         }
 139
 140         return -1;
 141 }
 142
 143 static void iwl4965_rs_rate_scale_perform(struct iwl_priv *priv,
 144                                    struct sk_buff *skb,
 145                                    struct ieee80211_sta *sta,
 146                                    struct iwl_lq_sta *lq_sta);
 147 static void iwl4965_rs_fill_link_cmd(struct iwl_priv *priv,
 148                              struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
 149 static void iwl4965_rs_stay_in_table(struct iwl_lq_sta *lq_sta,
 150                                         bool force_search);
 151
 152 #ifdef CONFIG_MAC80211_DEBUGFS
 153 static void iwl4965_rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 154                              u32 *rate_n_flags, int index);
 155 #else
 156 static void iwl4965_rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 157                              u32 *rate_n_flags, int index)
 158 {}
 159 #endif
 160
 161 /**
 162  * The following tables contain the expected throughput metrics for all rates
 163  *
 164  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 165  *
 166  * where invalid entries are zeros.
 167  *
 168  * CCK rates are only valid in legacy table and will only be used in G
 169  * (2.4 GHz) band.
 170  */
 171
 172 static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
 173         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
 174 };
 175
 176 static s32 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
 177         {0, 0, 0, 0, 42, 0,  76, 102, 124, 158, 183, 193, 202}, /* Norm */
 178         {0, 0, 0, 0, 46, 0,  82, 110, 132, 167, 192, 202, 210}, /* SGI */
 179         {0, 0, 0, 0, 48, 0,  93, 135, 176, 251, 319, 351, 381}, /* AGG */
 180         {0, 0, 0, 0, 53, 0, 102, 149, 193, 275, 348, 381, 413}, /* AGG+SGI */
 181 };
 182
 183 static s32 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
 184         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
 185         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
 186         {0, 0, 0, 0,  96, 0, 182, 259, 328, 451, 553, 598, 640}, /* AGG */
 187         {0, 0, 0, 0, 106, 0, 199, 282, 357, 487, 593, 640, 683}, /* AGG+SGI */
 188 };
 189
 190 static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 191         {0, 0, 0, 0,  74, 0, 123, 155, 179, 213, 235, 243, 250}, /* Norm */
 192         {0, 0, 0, 0,  81, 0, 131, 164, 187, 221, 242, 250, 256}, /* SGI */
 193         {0, 0, 0, 0,  92, 0, 175, 250, 317, 436, 534, 578, 619}, /* AGG */
 194         {0, 0, 0, 0, 102, 0, 192, 273, 344, 470, 573, 619, 660}, /* AGG+SGI*/
 195 };
 196
 197 static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 198         {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
 199         {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
 200         {0, 0, 0, 0, 180, 0, 327, 446, 545, 708, 828, 878, 922}, /* AGG */
 201         {0, 0, 0, 0, 197, 0, 355, 481, 584, 752, 872, 922, 966}, /* AGG+SGI */
 202 };
 203
 204 /* mbps, mcs */
 205 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 206         {  "1", "BPSK DSSS"},
 207         {  "2", "QPSK DSSS"},
 208         {"5.5", "BPSK CCK"},
 209         { "11", "QPSK CCK"},
 210         {  "6", "BPSK 1/2"},
 211         {  "9", "BPSK 1/2"},
 212         { "12", "QPSK 1/2"},
 213         { "18", "QPSK 3/4"},
 214         { "24", "16QAM 1/2"},
 215         { "36", "16QAM 3/4"},
 216         { "48", "64QAM 2/3"},
 217         { "54", "64QAM 3/4"},
 218         { "60", "64QAM 5/6"},
 219 };
 220
 221 #define MCS_INDEX_PER_STREAM    (8)
 222
 223 static inline u8 iwl4965_rs_extract_rate(u32 rate_n_flags)
 224 {
 225         return (u8)(rate_n_flags & 0xFF);
 226 }
 227
 228 static void
 229 iwl4965_rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 230 {
 231         window->data = 0;
 232         window->success_counter = 0;
 233         window->success_ratio = IWL_INVALID_VALUE;
 234         window->counter = 0;
 235         window->average_tpt = IWL_INVALID_VALUE;
 236         window->stamp = 0;
 237 }
 238
 239 static inline u8 iwl4965_rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 240 {
 241         return (ant_type & valid_antenna) == ant_type;
 242 }
 243
 244 /*
 245  *      removes the old data from the statistics. All data that is older than
 246  *      TID_MAX_TIME_DIFF, will be deleted.
 247  */
 248 static void
 249 iwl4965_rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
 250 {
 251         /* The oldest age we want to keep */
 252         u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
 253
 254         while (tl->queue_count &&
 255                (tl->time_stamp < oldest_time)) {
 256                 tl->total -= tl->packet_count[tl->head];
 257                 tl->packet_count[tl->head] = 0;
 258                 tl->time_stamp += TID_QUEUE_CELL_SPACING;
 259                 tl->queue_count--;
 260                 tl->head++;
 261                 if (tl->head >= TID_QUEUE_MAX_SIZE)
 262                         tl->head = 0;
 263         }
 264 }
 265
 266 /*
 267  *      increment traffic load value for tid and also remove
 268  *      any old values if passed the certain time period
 269  */
 270 static u8 iwl4965_rs_tl_add_packet(struct iwl_lq_sta *lq_data,
 271                            struct ieee80211_hdr *hdr)
 272 {
 273         u32 curr_time = jiffies_to_msecs(jiffies);
 274         u32 time_diff;
 275         s32 index;
 276         struct iwl_traffic_load *tl = NULL;
 277         u8 tid;
 278
 279         if (ieee80211_is_data_qos(hdr->frame_control)) {
 280                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 281                 tid = qc[0] & 0xf;
 282         } else
 283                 return MAX_TID_COUNT;
 284
 285         if (unlikely(tid >= TID_MAX_LOAD_COUNT))
 286                 return MAX_TID_COUNT;
 287
 288         tl = &lq_data->load[tid];
 289
 290         curr_time -= curr_time % TID_ROUND_VALUE;
 291
 292         /* Happens only for the first packet. Initialize the data */
 293         if (!(tl->queue_count)) {
 294                 tl->total = 1;
 295                 tl->time_stamp = curr_time;
 296                 tl->queue_count = 1;
 297                 tl->head = 0;
 298                 tl->packet_count[0] = 1;
 299                 return MAX_TID_COUNT;
 300         }
 301
 302         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 303         index = time_diff / TID_QUEUE_CELL_SPACING;
 304
 305         /* The history is too long: remove data that is older than */
 306         /* TID_MAX_TIME_DIFF */
 307         if (index >= TID_QUEUE_MAX_SIZE)
 308                 iwl4965_rs_tl_rm_old_stats(tl, curr_time);
 309
 310         index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
 311         tl->packet_count[index] = tl->packet_count[index] + 1;
 312         tl->total = tl->total + 1;
 313
 314         if ((index + 1) > tl->queue_count)
 315                 tl->queue_count = index + 1;
 316
 317         return tid;
 318 }
 319
 320 /*
 321         get the traffic load value for tid
 322 */
 323 static u32 iwl4965_rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
 324 {
 325         u32 curr_time = jiffies_to_msecs(jiffies);
 326         u32 time_diff;
 327         s32 index;
 328         struct iwl_traffic_load *tl = NULL;
 329
 330         if (tid >= TID_MAX_LOAD_COUNT)
 331                 return 0;
 332
 333         tl = &(lq_data->load[tid]);
 334
 335         curr_time -= curr_time % TID_ROUND_VALUE;
 336
 337         if (!(tl->queue_count))
 338                 return 0;
 339
 340         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 341         index = time_diff / TID_QUEUE_CELL_SPACING;
 342
 343         /* The history is too long: remove data that is older than */
 344         /* TID_MAX_TIME_DIFF */
 345         if (index >= TID_QUEUE_MAX_SIZE)
 346                 iwl4965_rs_tl_rm_old_stats(tl, curr_time);
 347
 348         return tl->total;
 349 }
 350
 351 static int iwl4965_rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
 352                                       struct iwl_lq_sta *lq_data, u8 tid,
 353                                       struct ieee80211_sta *sta)
 354 {
 355         int ret = -EAGAIN;
 356         u32 load;
 357
 358         load = iwl4965_rs_tl_get_load(lq_data, tid);
 359
 360         if (load > IWL_AGG_LOAD_THRESHOLD) {
 361                 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
 362                                 sta->addr, tid);
 363                 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
 364                 if (ret == -EAGAIN) {
 365                         /*
 366                          * driver and mac80211 is out of sync
 367                          * this might be cause by reloading firmware
 368                          * stop the tx ba session here
 369                          */
 370                         IWL_ERR(priv, "Fail start Tx agg on tid: %d\n",
 371                                 tid);
 372                         ieee80211_stop_tx_ba_session(sta, tid);
 373                 }
 374         } else {
 375                 IWL_ERR(priv, "Aggregation not enabled for tid %d "
 376                         "because load = %u\n", tid, load);
 377         }
 378         return ret;
 379 }
 380
 381 static void iwl4965_rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
 382                               struct iwl_lq_sta *lq_data,
 383                               struct ieee80211_sta *sta)
 384 {
 385         if (tid < TID_MAX_LOAD_COUNT)
 386                 iwl4965_rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 387         else
 388                 IWL_ERR(priv, "tid exceeds max load count: %d/%d\n",
 389                         tid, TID_MAX_LOAD_COUNT);
 390 }
 391
 392 static inline int iwl4965_get_iwl4965_num_of_ant_from_rate(u32 rate_n_flags)
 393 {
 394         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 395                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 396                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 397 }
 398
 399 /*
 400  * Static function to get the expected throughput from an iwl_scale_tbl_info
 401  * that wraps a NULL pointer check
 402  */
 403 static s32
 404 iwl4965_get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 405 {
 406         if (tbl->expected_tpt)
 407                 return tbl->expected_tpt[rs_index];
 408         return 0;
 409 }
 410
 411 /**
 412  * iwl4965_rs_collect_tx_data - Update the success/failure sliding window
 413  *
 414  * We keep a sliding window of the last 62 packets transmitted
 415  * at this rate.  window->data contains the bitmask of successful
 416  * packets.
 417  */
 418 static int iwl4965_rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
 419                               int scale_index, int attempts, int successes)
 420 {
 421         struct iwl_rate_scale_data *window = NULL;
 422         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 423         s32 fail_count, tpt;
 424
 425         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 426                 return -EINVAL;
 427
 428         /* Select window for current tx bit rate */
 429         window = &(tbl->win[scale_index]);
 430
 431         /* Get expected throughput */
 432         tpt = iwl4965_get_expected_tpt(tbl, scale_index);
 433
 434         /*
 435          * Keep track of only the latest 62 tx frame attempts in this rate's
 436          * history window; anything older isn't really relevant any more.
 437          * If we have filled up the sliding window, drop the oldest attempt;
 438          * if the oldest attempt (highest bit in bitmap) shows "success",
 439          * subtract "1" from the success counter (this is the main reason
 440          * we keep these bitmaps!).
 441          */
 442         while (attempts > 0) {
 443                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 444
 445                         /* remove earliest */
 446                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 447
 448                         if (window->data & mask) {
 449                                 window->data &= ~mask;
 450                                 window->success_counter--;
 451                         }
 452                 }
 453
 454                 /* Increment frames-attempted counter */
 455                 window->counter++;
 456
 457                 /* Shift bitmap by one frame to throw away oldest history */
 458                 window->data <<= 1;
 459
 460                 /* Mark the most recent #successes attempts as successful */
 461                 if (successes > 0) {
 462                         window->success_counter++;
 463                         window->data |= 0x1;
 464                         successes--;
 465                 }
 466
 467                 attempts--;
 468         }
 469
 470         /* Calculate current success ratio, avoid divide-by-0! */
 471         if (window->counter > 0)
 472                 window->success_ratio = 128 * (100 * window->success_counter)
 473                                         / window->counter;
 474         else
 475                 window->success_ratio = IWL_INVALID_VALUE;
 476
 477         fail_count = window->counter - window->success_counter;
 478
 479         /* Calculate average throughput, if we have enough history. */
 480         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 481             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 482                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 483         else
 484                 window->average_tpt = IWL_INVALID_VALUE;
 485
 486         /* Tag this window as having been updated */
 487         window->stamp = jiffies;
 488
 489         return 0;
 490 }
 491
 492 /*
 493  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
 494  */
 495 static u32 iwl4965_rate_n_flags_from_tbl(struct iwl_priv *priv,
 496                                  struct iwl_scale_tbl_info *tbl,
 497                                  int index, u8 use_green)
 498 {
 499         u32 rate_n_flags = 0;
 500
 501         if (is_legacy(tbl->lq_type)) {
 502                 rate_n_flags = iwlegacy_rates[index].plcp;
 503                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 504                         rate_n_flags |= RATE_MCS_CCK_MSK;
 505
 506         } else if (is_Ht(tbl->lq_type)) {
 507                 if (index > IWL_LAST_OFDM_RATE) {
 508                         IWL_ERR(priv, "Invalid HT rate index %d\n", index);
 509                         index = IWL_LAST_OFDM_RATE;
 510                 }
 511                 rate_n_flags = RATE_MCS_HT_MSK;
 512
 513                 if (is_siso(tbl->lq_type))
 514                         rate_n_flags |= iwlegacy_rates[index].plcp_siso;
 515                 else
 516                         rate_n_flags |= iwlegacy_rates[index].plcp_mimo2;
 517         } else {
 518                 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
 519         }
 520
 521         rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
 522                                                      RATE_MCS_ANT_ABC_MSK);
 523
 524         if (is_Ht(tbl->lq_type)) {
 525                 if (tbl->is_ht40) {
 526                         if (tbl->is_dup)
 527                                 rate_n_flags |= RATE_MCS_DUP_MSK;
 528                         else
 529                                 rate_n_flags |= RATE_MCS_HT40_MSK;
 530                 }
 531                 if (tbl->is_SGI)
 532                         rate_n_flags |= RATE_MCS_SGI_MSK;
 533
 534                 if (use_green) {
 535                         rate_n_flags |= RATE_MCS_GF_MSK;
 536                         if (is_siso(tbl->lq_type) && tbl->is_SGI) {
 537                                 rate_n_flags &= ~RATE_MCS_SGI_MSK;
 538                                 IWL_ERR(priv, "GF was set with SGI:SISO\n");
 539                         }
 540                 }
 541         }
 542         return rate_n_flags;
 543 }
 544
 545 /*
 546  * Interpret uCode API's rate_n_flags format,
 547  * fill "search" or "active" tx mode table.
 548  */
 549 static int iwl4965_rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
 550                                     enum ieee80211_band band,
 551                                     struct iwl_scale_tbl_info *tbl,
 552                                     int *rate_idx)
 553 {
 554         u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
 555         u8 iwl4965_num_of_ant = iwl4965_get_iwl4965_num_of_ant_from_rate(rate_n_flags);
 556         u8 mcs;
 557
 558         memset(tbl, 0, sizeof(struct iwl_scale_tbl_info));
 559         *rate_idx = iwl4965_hwrate_to_plcp_idx(rate_n_flags);
 560
 561         if (*rate_idx  == IWL_RATE_INVALID) {
 562                 *rate_idx = -1;
 563                 return -EINVAL;
 564         }
 565         tbl->is_SGI = 0;        /* default legacy setup */
 566         tbl->is_ht40 = 0;
 567         tbl->is_dup = 0;
 568         tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
 569         tbl->lq_type = LQ_NONE;
 570         tbl->max_search = IWL_MAX_SEARCH;
 571
 572         /* legacy rate format */
 573         if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
 574                 if (iwl4965_num_of_ant == 1) {
 575                         if (band == IEEE80211_BAND_5GHZ)
 576                                 tbl->lq_type = LQ_A;
 577                         else
 578                                 tbl->lq_type = LQ_G;
 579                 }
 580         /* HT rate format */
 581         } else {
 582                 if (rate_n_flags & RATE_MCS_SGI_MSK)
 583                         tbl->is_SGI = 1;
 584
 585                 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
 586                     (rate_n_flags & RATE_MCS_DUP_MSK))
 587                         tbl->is_ht40 = 1;
 588
 589                 if (rate_n_flags & RATE_MCS_DUP_MSK)
 590                         tbl->is_dup = 1;
 591
 592                 mcs = iwl4965_rs_extract_rate(rate_n_flags);
 593
 594                 /* SISO */
 595                 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
 596                         if (iwl4965_num_of_ant == 1)
 597                                 tbl->lq_type = LQ_SISO; /*else NONE*/
 598                 /* MIMO2 */
 599                 } else {
 600                         if (iwl4965_num_of_ant == 2)
 601                                 tbl->lq_type = LQ_MIMO2;
 602                 }
 603         }
 604         return 0;
 605 }
 606
 607 /* switch to another antenna/antennas and return 1 */
 608 /* if no other valid antenna found, return 0 */
 609 static int iwl4965_rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
 610                              struct iwl_scale_tbl_info *tbl)
 611 {
 612         u8 new_ant_type;
 613
 614         if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
 615                 return 0;
 616
 617         if (!iwl4965_rs_is_valid_ant(valid_ant, tbl->ant_type))
 618                 return 0;
 619
 620         new_ant_type = ant_toggle_lookup[tbl->ant_type];
 621
 622         while ((new_ant_type != tbl->ant_type) &&
 623                !iwl4965_rs_is_valid_ant(valid_ant, new_ant_type))
 624                 new_ant_type = ant_toggle_lookup[new_ant_type];
 625
 626         if (new_ant_type == tbl->ant_type)
 627                 return 0;
 628
 629         tbl->ant_type = new_ant_type;
 630         *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
 631         *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
 632         return 1;
 633 }
 634
 635 /**
 636  * Green-field mode is valid if the station supports it and
 637  * there are no non-GF stations present in the BSS.
 638  */
 639 static bool iwl4965_rs_use_green(struct ieee80211_sta *sta)
 640 {
 641         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
 642         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
 643
 644         return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
 645                 !(ctx->ht.non_gf_sta_present);
 646 }
 647
 648 /**
 649  * iwl4965_rs_get_supported_rates - get the available rates
 650  *
 651  * if management frame or broadcast frame only return
 652  * basic available rates.
 653  *
 654  */
 655 static u16 iwl4965_rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 656                                   struct ieee80211_hdr *hdr,
 657                                   enum iwl_table_type rate_type)
 658 {
 659         if (is_legacy(rate_type)) {
 660                 return lq_sta->active_legacy_rate;
 661         } else {
 662                 if (is_siso(rate_type))
 663                         return lq_sta->active_siso_rate;
 664                 else
 665                         return lq_sta->active_mimo2_rate;
 666         }
 667 }
 668
 669 static u16
 670 iwl4965_rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
 671                                 int rate_type)
 672 {
 673         u8 high = IWL_RATE_INVALID;
 674         u8 low = IWL_RATE_INVALID;
 675
 676         /* 802.11A or ht walks to the next literal adjacent rate in
 677          * the rate table */
 678         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 679                 int i;
 680                 u32 mask;
 681
 682                 /* Find the previous rate that is in the rate mask */
 683                 i = index - 1;
 684                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 685                         if (rate_mask & mask) {
 686                                 low = i;
 687                                 break;
 688                         }
 689                 }
 690
 691                 /* Find the next rate that is in the rate mask */
 692                 i = index + 1;
 693                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 694                         if (rate_mask & mask) {
 695                                 high = i;
 696                                 break;
 697                         }
 698                 }
 699
 700                 return (high << 8) | low;
 701         }
 702
 703         low = index;
 704         while (low != IWL_RATE_INVALID) {
 705                 low = iwlegacy_rates[low].prev_rs;
 706                 if (low == IWL_RATE_INVALID)
 707                         break;
 708                 if (rate_mask & (1 << low))
 709                         break;
 710                 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
 711         }
 712
 713         high = index;
 714         while (high != IWL_RATE_INVALID) {
 715                 high = iwlegacy_rates[high].next_rs;
 716                 if (high == IWL_RATE_INVALID)
 717                         break;
 718                 if (rate_mask & (1 << high))
 719                         break;
 720                 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
 721         }
 722
 723         return (high << 8) | low;
 724 }
 725
 726 static u32 iwl4965_rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
 727                              struct iwl_scale_tbl_info *tbl,
 728                              u8 scale_index, u8 ht_possible)
 729 {
 730         s32 low;
 731         u16 rate_mask;
 732         u16 high_low;
 733         u8 switch_to_legacy = 0;
 734         u8 is_green = lq_sta->is_green;
 735         struct iwl_priv *priv = lq_sta->drv;
 736
 737         /* check if we need to switch from HT to legacy rates.
 738          * assumption is that mandatory rates (1Mbps or 6Mbps)
 739          * are always supported (spec demand) */
 740         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
 741                 switch_to_legacy = 1;
 742                 scale_index = rs_ht_to_legacy[scale_index];
 743                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 744                         tbl->lq_type = LQ_A;
 745                 else
 746                         tbl->lq_type = LQ_G;
 747
 748                 if (iwl4965_num_of_ant(tbl->ant_type) > 1)
 749                         tbl->ant_type =
 750                                 iwl4965_first_antenna(priv->hw_params.valid_tx_ant);
 751
 752                 tbl->is_ht40 = 0;
 753                 tbl->is_SGI = 0;
 754                 tbl->max_search = IWL_MAX_SEARCH;
 755         }
 756
 757         rate_mask = iwl4965_rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
 758
 759         /* Mask with station rate restriction */
 760         if (is_legacy(tbl->lq_type)) {
 761                 /* supp_rates has no CCK bits in A mode */
 762                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 763                         rate_mask  = (u16)(rate_mask &
 764                            (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
 765                 else
 766                         rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
 767         }
 768
 769         /* If we switched from HT to legacy, check current rate */
 770         if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
 771                 low = scale_index;
 772                 goto out;
 773         }
 774
 775         high_low = iwl4965_rs_get_adjacent_rate(lq_sta->drv,
 776                                         scale_index, rate_mask,
 777                                         tbl->lq_type);
 778         low = high_low & 0xff;
 779
 780         if (low == IWL_RATE_INVALID)
 781                 low = scale_index;
 782
 783 out:
 784         return iwl4965_rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
 785 }
 786
 787 /*
 788  * Simple function to compare two rate scale table types
 789  */
 790 static bool iwl4965_table_type_matches(struct iwl_scale_tbl_info *a,
 791                                struct iwl_scale_tbl_info *b)
 792 {
 793         return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
 794                 (a->is_SGI == b->is_SGI);
 795 }
 796
 797 /*
 798  * mac80211 sends us Tx status
 799  */
 800 static void
 801 iwl4965_rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
 802                          struct ieee80211_sta *sta, void *priv_sta,
 803                          struct sk_buff *skb)
 804 {
 805         int legacy_success;
 806         int retries;
 807         int rs_index, mac_index, i;
 808         struct iwl_lq_sta *lq_sta = priv_sta;
 809         struct iwl_link_quality_cmd *table;
 810         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 811         struct iwl_priv *priv = (struct iwl_priv *)priv_r;
 812         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 813         enum mac80211_rate_control_flags mac_flags;
 814         u32 tx_rate;
 815         struct iwl_scale_tbl_info tbl_type;
 816         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
 817         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
 818         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
 819
 820         IWL_DEBUG_RATE_LIMIT(priv,
 821                 "get frame ack response, update rate scale window\n");
 822
 823         /* Treat uninitialized rate scaling data same as non-existing. */
 824         if (!lq_sta) {
 825                 IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n");
 826                 return;
 827         } else if (!lq_sta->drv) {
 828                 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
 829                 return;
 830         }
 831
 832         if (!ieee80211_is_data(hdr->frame_control) ||
 833             info->flags & IEEE80211_TX_CTL_NO_ACK)
 834                 return;
 835
 836         /* This packet was aggregated but doesn't carry status info */
 837         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 838             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 839                 return;
 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         table = &lq_sta->lq;
 850         tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
 851         iwl4965_rs_get_tbl_info_from_mcs(tx_rate,
 852                          priv->band, &tbl_type, &rs_index);
 853         if (priv->band == IEEE80211_BAND_5GHZ)
 854                 rs_index -= IWL_FIRST_OFDM_RATE;
 855         mac_flags = info->status.rates[0].flags;
 856         mac_index = info->status.rates[0].idx;
 857         /* For HT packets, map MCS to PLCP */
 858         if (mac_flags & IEEE80211_TX_RC_MCS) {
 859                 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
 860                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
 861                         mac_index++;
 862                 /*
 863                  * mac80211 HT index is always zero-indexed; we need to move
 864                  * HT OFDM rates after CCK rates in 2.4 GHz band
 865                  */
 866                 if (priv->band == IEEE80211_BAND_2GHZ)
 867                         mac_index += IWL_FIRST_OFDM_RATE;
 868         }
 869         /* Here we actually compare this rate to the latest LQ command */
 870         if ((mac_index < 0) ||
 871             (tbl_type.is_SGI !=
 872                         !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
 873             (tbl_type.is_ht40 !=
 874                         !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
 875             (tbl_type.is_dup !=
 876                         !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
 877             (tbl_type.ant_type != info->antenna_sel_tx) ||
 878             (!!(tx_rate & RATE_MCS_HT_MSK) !=
 879                         !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
 880             (!!(tx_rate & RATE_MCS_GF_MSK) !=
 881                         !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
 882             (rs_index != mac_index)) {
 883                 IWL_DEBUG_RATE(priv,
 884                 "initial rate %d does not match %d (0x%x)\n",
 885                          mac_index, rs_index, tx_rate);
 886                 /*
 887                  * Since rates mis-match, the last LQ command may have failed.
 888                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
 889                  * ... driver.
 890                  */
 891                 lq_sta->missed_rate_counter++;
 892                 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
 893                         lq_sta->missed_rate_counter = 0;
 894                         iwl_legacy_send_lq_cmd(priv, ctx, &lq_sta->lq,
 895                                                         CMD_ASYNC, false);
 896                 }
 897                 /* Regardless, ignore this status info for outdated rate */
 898                 return;
 899         } else
 900                 /* Rate did match, so reset the missed_rate_counter */
 901                 lq_sta->missed_rate_counter = 0;
 902
 903         /* Figure out if rate scale algorithm is in active or search table */
 904         if (iwl4965_table_type_matches(&tbl_type,
 905                                 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
 906                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 907                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 908         } else if (iwl4965_table_type_matches(&tbl_type,
 909                                 &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
 910                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 911                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 912         } else {
 913                 IWL_DEBUG_RATE(priv,
 914                         "Neither active nor search matches tx rate\n");
 915                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 916                 IWL_DEBUG_RATE(priv, "active- lq:%x, ant:%x, SGI:%d\n",
 917                         tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
 918                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 919                 IWL_DEBUG_RATE(priv, "search- lq:%x, ant:%x, SGI:%d\n",
 920                         tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
 921                 IWL_DEBUG_RATE(priv, "actual- lq:%x, ant:%x, SGI:%d\n",
 922                         tbl_type.lq_type, tbl_type.ant_type, tbl_type.is_SGI);
 923                 /*
 924                  * no matching table found, let's by-pass the data collection
 925                  * and continue to perform rate scale to find the rate table
 926                  */
 927                 iwl4965_rs_stay_in_table(lq_sta, true);
 928                 goto done;
 929         }
 930
 931         /*
 932          * Updating the frame history depends on whether packets were
 933          * aggregated.
 934          *
 935          * For aggregation, all packets were transmitted at the same rate, the
 936          * first index into rate scale table.
 937          */
 938         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
 939                 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
 940                 iwl4965_rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
 941                                 &rs_index);
 942                 iwl4965_rs_collect_tx_data(curr_tbl, rs_index,
 943                                    info->status.ampdu_len,
 944                                    info->status.ampdu_ack_len);
 945
 946                 /* Update success/fail counts if not searching for new mode */
 947                 if (lq_sta->stay_in_tbl) {
 948                         lq_sta->total_success += info->status.ampdu_ack_len;
 949                         lq_sta->total_failed += (info->status.ampdu_len -
 950                                         info->status.ampdu_ack_len);
 951                 }
 952         } else {
 953         /*
 954          * For legacy, update frame history with for each Tx retry.
 955          */
 956                 retries = info->status.rates[0].count - 1;
 957                 /* HW doesn't send more than 15 retries */
 958                 retries = min(retries, 15);
 959
 960                 /* The last transmission may have been successful */
 961                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
 962                 /* Collect data for each rate used during failed TX attempts */
 963                 for (i = 0; i <= retries; ++i) {
 964                         tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
 965                         iwl4965_rs_get_tbl_info_from_mcs(tx_rate, priv->band,
 966                                         &tbl_type, &rs_index);
 967                         /*
 968                          * Only collect stats if retried rate is in the same RS
 969                          * table as active/search.
 970                          */
 971                         if (iwl4965_table_type_matches(&tbl_type, curr_tbl))
 972                                 tmp_tbl = curr_tbl;
 973                         else if (iwl4965_table_type_matches(&tbl_type,
 974                                                                  other_tbl))
 975                                 tmp_tbl = other_tbl;
 976                         else
 977                                 continue;
 978                         iwl4965_rs_collect_tx_data(tmp_tbl, rs_index, 1,
 979                                            i < retries ? 0 : legacy_success);
 980                 }
 981
 982                 /* Update success/fail counts if not searching for new mode */
 983                 if (lq_sta->stay_in_tbl) {
 984                         lq_sta->total_success += legacy_success;
 985                         lq_sta->total_failed += retries + (1 - legacy_success);
 986                 }
 987         }
 988         /* The last TX rate is cached in lq_sta; it's set in if/else above */
 989         lq_sta->last_rate_n_flags = tx_rate;
 990 done:
 991         /* See if there's a better rate or modulation mode to try. */
 992         if (sta && sta->supp_rates[sband->band])
 993                 iwl4965_rs_rate_scale_perform(priv, skb, sta, lq_sta);
 994 }
 995
 996 /*
 997  * Begin a period of staying with a selected modulation mode.
 998  * Set "stay_in_tbl" flag to prevent any mode switches.
 999  * Set frame tx success limits according to legacy vs. high-throughput,
1000  * and reset overall (spanning all rates) tx success history statistics.
1001  * These control how long we stay using same modulation mode before
1002  * searching for a new mode.
1003  */
1004 static void iwl4965_rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
1005                                  struct iwl_lq_sta *lq_sta)
1006 {
1007         IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
1008         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
1009         if (is_legacy) {
1010                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1011                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1012                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1013         } else {
1014                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1015                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1016                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1017         }
1018         lq_sta->table_count = 0;
1019         lq_sta->total_failed = 0;
1020         lq_sta->total_success = 0;
1021         lq_sta->flush_timer = jiffies;
1022         lq_sta->action_counter = 0;
1023 }
1024
1025 /*
1026  * Find correct throughput table for given mode of modulation
1027  */
1028 static void iwl4965_rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1029                                       struct iwl_scale_tbl_info *tbl)
1030 {
1031         /* Used to choose among HT tables */
1032         s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1033
1034         /* Check for invalid LQ type */
1035         if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1036                 tbl->expected_tpt = expected_tpt_legacy;
1037                 return;
1038         }
1039
1040         /* Legacy rates have only one table */
1041         if (is_legacy(tbl->lq_type)) {
1042                 tbl->expected_tpt = expected_tpt_legacy;
1043                 return;
1044         }
1045
1046         /* Choose among many HT tables depending on number of streams
1047          * (SISO/MIMO2), channel width (20/40), SGI, and aggregation
1048          * status */
1049         if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1050                 ht_tbl_pointer = expected_tpt_siso20MHz;
1051         else if (is_siso(tbl->lq_type))
1052                 ht_tbl_pointer = expected_tpt_siso40MHz;
1053         else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1054                 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1055         else /* if (is_mimo2(tbl->lq_type)) <-- must be true */
1056                 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1057
1058         if (!tbl->is_SGI && !lq_sta->is_agg)            /* Normal */
1059                 tbl->expected_tpt = ht_tbl_pointer[0];
1060         else if (tbl->is_SGI && !lq_sta->is_agg)        /* SGI */
1061                 tbl->expected_tpt = ht_tbl_pointer[1];
1062         else if (!tbl->is_SGI && lq_sta->is_agg)        /* AGG */
1063                 tbl->expected_tpt = ht_tbl_pointer[2];
1064         else                                            /* AGG+SGI */
1065                 tbl->expected_tpt = ht_tbl_pointer[3];
1066 }
1067
1068 /*
1069  * Find starting rate for new "search" high-throughput mode of modulation.
1070  * Goal is to find lowest expected rate (under perfect conditions) that is
1071  * above the current measured throughput of "active" mode, to give new mode
1072  * a fair chance to prove itself without too many challenges.
1073  *
1074  * This gets called when transitioning to more aggressive modulation
1075  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1076  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1077  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1078  * bit rate will typically need to increase, but not if performance was bad.
1079  */
1080 static s32 iwl4965_rs_get_best_rate(struct iwl_priv *priv,
1081                             struct iwl_lq_sta *lq_sta,
1082                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1083                             u16 rate_mask, s8 index)
1084 {
1085         /* "active" values */
1086         struct iwl_scale_tbl_info *active_tbl =
1087             &(lq_sta->lq_info[lq_sta->active_tbl]);
1088         s32 active_sr = active_tbl->win[index].success_ratio;
1089         s32 active_tpt = active_tbl->expected_tpt[index];
1090
1091         /* expected "search" throughput */
1092         s32 *tpt_tbl = tbl->expected_tpt;
1093
1094         s32 new_rate, high, low, start_hi;
1095         u16 high_low;
1096         s8 rate = index;
1097
1098         new_rate = high = low = start_hi = IWL_RATE_INVALID;
1099
1100         for (; ;) {
1101                 high_low = iwl4965_rs_get_adjacent_rate(priv, rate, rate_mask,
1102                                                 tbl->lq_type);
1103
1104                 low = high_low & 0xff;
1105                 high = (high_low >> 8) & 0xff;
1106
1107                 /*
1108                  * Lower the "search" bit rate, to give new "search" mode
1109                  * approximately the same throughput as "active" if:
1110                  *
1111                  * 1) "Active" mode has been working modestly well (but not
1112                  *    great), and expected "search" throughput (under perfect
1113                  *    conditions) at candidate rate is above the actual
1114                  *    measured "active" throughput (but less than expected
1115                  *    "active" throughput under perfect conditions).
1116                  * OR
1117                  * 2) "Active" mode has been working perfectly or very well
1118                  *    and expected "search" throughput (under perfect
1119                  *    conditions) at candidate rate is above expected
1120                  *    "active" throughput (under perfect conditions).
1121                  */
1122                 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1123                      ((active_sr > IWL_RATE_DECREASE_TH) &&
1124                       (active_sr <= IWL_RATE_HIGH_TH) &&
1125                       (tpt_tbl[rate] <= active_tpt))) ||
1126                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1127                      (tpt_tbl[rate] > active_tpt))) {
1128
1129                         /* (2nd or later pass)
1130                          * If we've already tried to raise the rate, and are
1131                          * now trying to lower it, use the higher rate. */
1132                         if (start_hi != IWL_RATE_INVALID) {
1133                                 new_rate = start_hi;
1134                                 break;
1135                         }
1136
1137                         new_rate = rate;
1138
1139                         /* Loop again with lower rate */
1140                         if (low != IWL_RATE_INVALID)
1141                                 rate = low;
1142
1143                         /* Lower rate not available, use the original */
1144                         else
1145                                 break;
1146
1147                 /* Else try to raise the "search" rate to match "active" */
1148                 } else {
1149                         /* (2nd or later pass)
1150                          * If we've already tried to lower the rate, and are
1151                          * now trying to raise it, use the lower rate. */
1152                         if (new_rate != IWL_RATE_INVALID)
1153                                 break;
1154
1155                         /* Loop again with higher rate */
1156                         else if (high != IWL_RATE_INVALID) {
1157                                 start_hi = high;
1158                                 rate = high;
1159
1160                         /* Higher rate not available, use the original */
1161                         } else {
1162                                 new_rate = rate;
1163                                 break;
1164                         }
1165                 }
1166         }
1167
1168         return new_rate;
1169 }
1170
1171 /*
1172  * Set up search table for MIMO2
1173  */
1174 static int iwl4965_rs_switch_to_mimo2(struct iwl_priv *priv,
1175                              struct iwl_lq_sta *lq_sta,
1176                              struct ieee80211_conf *conf,
1177                              struct ieee80211_sta *sta,
1178                              struct iwl_scale_tbl_info *tbl, int index)
1179 {
1180         u16 rate_mask;
1181         s32 rate;
1182         s8 is_green = lq_sta->is_green;
1183         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1184         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1185
1186         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1187                 return -1;
1188
1189         if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1190                                                 == WLAN_HT_CAP_SM_PS_STATIC)
1191                 return -1;
1192
1193         /* Need both Tx chains/antennas to support MIMO */
1194         if (priv->hw_params.tx_chains_num < 2)
1195                 return -1;
1196
1197         IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1198
1199         tbl->lq_type = LQ_MIMO2;
1200         tbl->is_dup = lq_sta->is_dup;
1201         tbl->action = 0;
1202         tbl->max_search = IWL_MAX_SEARCH;
1203         rate_mask = lq_sta->active_mimo2_rate;
1204
1205         if (iwl_legacy_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1206                 tbl->is_ht40 = 1;
1207         else
1208                 tbl->is_ht40 = 0;
1209
1210         iwl4965_rs_set_expected_tpt_table(lq_sta, tbl);
1211
1212         rate = iwl4965_rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1213
1214         IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n",
1215                                 rate, rate_mask);
1216         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1217                 IWL_DEBUG_RATE(priv,
1218                                 "Can't switch with index %d rate mask %x\n",
1219                                                 rate, rate_mask);
1220                 return -1;
1221         }
1222         tbl->current_rate = iwl4965_rate_n_flags_from_tbl(priv,
1223                                                  tbl, rate, is_green);
1224
1225         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1226                      tbl->current_rate, is_green);
1227         return 0;
1228 }
1229
1230 /*
1231  * Set up search table for SISO
1232  */
1233 static int iwl4965_rs_switch_to_siso(struct iwl_priv *priv,
1234                              struct iwl_lq_sta *lq_sta,
1235                              struct ieee80211_conf *conf,
1236                              struct ieee80211_sta *sta,
1237                              struct iwl_scale_tbl_info *tbl, int index)
1238 {
1239         u16 rate_mask;
1240         u8 is_green = lq_sta->is_green;
1241         s32 rate;
1242         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1243         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1244
1245         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1246                 return -1;
1247
1248         IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1249
1250         tbl->is_dup = lq_sta->is_dup;
1251         tbl->lq_type = LQ_SISO;
1252         tbl->action = 0;
1253         tbl->max_search = IWL_MAX_SEARCH;
1254         rate_mask = lq_sta->active_siso_rate;
1255
1256         if (iwl_legacy_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1257                 tbl->is_ht40 = 1;
1258         else
1259                 tbl->is_ht40 = 0;
1260
1261         if (is_green)
1262                 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1263
1264         iwl4965_rs_set_expected_tpt_table(lq_sta, tbl);
1265         rate = iwl4965_rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1266
1267         IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1268         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1269                 IWL_DEBUG_RATE(priv,
1270                         "can not switch with index %d rate mask %x\n",
1271                              rate, rate_mask);
1272                 return -1;
1273         }
1274         tbl->current_rate = iwl4965_rate_n_flags_from_tbl(priv,
1275                                                 tbl, rate, is_green);
1276         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1277                      tbl->current_rate, is_green);
1278         return 0;
1279 }
1280
1281 /*
1282  * Try to switch to new modulation mode from legacy
1283  */
1284 static int iwl4965_rs_move_legacy_other(struct iwl_priv *priv,
1285                                 struct iwl_lq_sta *lq_sta,
1286                                 struct ieee80211_conf *conf,
1287                                 struct ieee80211_sta *sta,
1288                                 int index)
1289 {
1290         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1291         struct iwl_scale_tbl_info *search_tbl =
1292                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1293         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1294         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1295                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1296         u8 start_action;
1297         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1298         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1299         int ret = 0;
1300         u8 update_search_tbl_counter = 0;
1301
1302         tbl->action = IWL_LEGACY_SWITCH_SISO;
1303
1304         start_action = tbl->action;
1305         for (; ;) {
1306                 lq_sta->action_counter++;
1307                 switch (tbl->action) {
1308                 case IWL_LEGACY_SWITCH_ANTENNA1:
1309                 case IWL_LEGACY_SWITCH_ANTENNA2:
1310                         IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1311
1312                         if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1313                                                         tx_chains_num <= 1) ||
1314                             (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1315                                                         tx_chains_num <= 2))
1316                                 break;
1317
1318                         /* Don't change antenna if success has been great */
1319                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1320                                 break;
1321
1322                         /* Set up search table to try other antenna */
1323                         memcpy(search_tbl, tbl, sz);
1324
1325                         if (iwl4965_rs_toggle_antenna(valid_tx_ant,
1326                                 &search_tbl->current_rate, search_tbl)) {
1327                                 update_search_tbl_counter = 1;
1328                                 iwl4965_rs_set_expected_tpt_table(lq_sta,
1329                                                                 search_tbl);
1330                                 goto out;
1331                         }
1332                         break;
1333                 case IWL_LEGACY_SWITCH_SISO:
1334                         IWL_DEBUG_RATE(priv, "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 = iwl4965_rs_switch_to_siso(priv, lq_sta, conf, sta,
1340                                                  search_tbl, index);
1341                         if (!ret) {
1342                                 lq_sta->action_counter = 0;
1343                                 goto out;
1344                         }
1345
1346                         break;
1347                 case IWL_LEGACY_SWITCH_MIMO2_AB:
1348                 case IWL_LEGACY_SWITCH_MIMO2_AC:
1349                 case IWL_LEGACY_SWITCH_MIMO2_BC:
1350                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1351
1352                         /* Set up search table to try MIMO */
1353                         memcpy(search_tbl, tbl, sz);
1354                         search_tbl->is_SGI = 0;
1355
1356                         if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1357                                 search_tbl->ant_type = ANT_AB;
1358                         else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1359                                 search_tbl->ant_type = ANT_AC;
1360                         else
1361                                 search_tbl->ant_type = ANT_BC;
1362
1363                         if (!iwl4965_rs_is_valid_ant(valid_tx_ant,
1364                                                 search_tbl->ant_type))
1365                                 break;
1366
1367                         ret = iwl4965_rs_switch_to_mimo2(priv, lq_sta,
1368                                                 conf, sta,
1369                                                  search_tbl, index);
1370                         if (!ret) {
1371                                 lq_sta->action_counter = 0;
1372                                 goto out;
1373                         }
1374                         break;
1375                 }
1376                 tbl->action++;
1377                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2_BC)
1378                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1379
1380                 if (tbl->action == start_action)
1381                         break;
1382
1383         }
1384         search_tbl->lq_type = LQ_NONE;
1385         return 0;
1386
1387 out:
1388         lq_sta->search_better_tbl = 1;
1389         tbl->action++;
1390         if (tbl->action > IWL_LEGACY_SWITCH_MIMO2_BC)
1391                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1392         if (update_search_tbl_counter)
1393                 search_tbl->action = tbl->action;
1394         return 0;
1395
1396 }
1397
1398 /*
1399  * Try to switch to new modulation mode from SISO
1400  */
1401 static int iwl4965_rs_move_siso_to_other(struct iwl_priv *priv,
1402                                  struct iwl_lq_sta *lq_sta,
1403                                  struct ieee80211_conf *conf,
1404                                  struct ieee80211_sta *sta, int index)
1405 {
1406         u8 is_green = lq_sta->is_green;
1407         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1408         struct iwl_scale_tbl_info *search_tbl =
1409                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1410         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1411         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1412         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1413                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1414         u8 start_action;
1415         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1416         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1417         u8 update_search_tbl_counter = 0;
1418         int ret;
1419
1420         start_action = tbl->action;
1421
1422         for (;;) {
1423                 lq_sta->action_counter++;
1424                 switch (tbl->action) {
1425                 case IWL_SISO_SWITCH_ANTENNA1:
1426                 case IWL_SISO_SWITCH_ANTENNA2:
1427                         IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1428                         if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1429                                                 tx_chains_num <= 1) ||
1430                             (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1431                                                 tx_chains_num <= 2))
1432                                 break;
1433
1434                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1435                                 break;
1436
1437                         memcpy(search_tbl, tbl, sz);
1438                         if (iwl4965_rs_toggle_antenna(valid_tx_ant,
1439                                        &search_tbl->current_rate, search_tbl)) {
1440                                 update_search_tbl_counter = 1;
1441                                 goto out;
1442                         }
1443                         break;
1444                 case IWL_SISO_SWITCH_MIMO2_AB:
1445                 case IWL_SISO_SWITCH_MIMO2_AC:
1446                 case IWL_SISO_SWITCH_MIMO2_BC:
1447                         IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1448                         memcpy(search_tbl, tbl, sz);
1449                         search_tbl->is_SGI = 0;
1450
1451                         if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1452                                 search_tbl->ant_type = ANT_AB;
1453                         else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1454                                 search_tbl->ant_type = ANT_AC;
1455                         else
1456                                 search_tbl->ant_type = ANT_BC;
1457
1458                         if (!iwl4965_rs_is_valid_ant(valid_tx_ant,
1459                                                  search_tbl->ant_type))
1460                                 break;
1461
1462                         ret = iwl4965_rs_switch_to_mimo2(priv, lq_sta,
1463                                                 conf, sta,
1464                                                  search_tbl, index);
1465                         if (!ret)
1466                                 goto out;
1467                         break;
1468                 case IWL_SISO_SWITCH_GI:
1469                         if (!tbl->is_ht40 && !(ht_cap->cap &
1470                                                 IEEE80211_HT_CAP_SGI_20))
1471                                 break;
1472                         if (tbl->is_ht40 && !(ht_cap->cap &
1473                                                 IEEE80211_HT_CAP_SGI_40))
1474                                 break;
1475
1476                         IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1477
1478                         memcpy(search_tbl, tbl, sz);
1479                         if (is_green) {
1480                                 if (!tbl->is_SGI)
1481                                         break;
1482                                 else
1483                                         IWL_ERR(priv,
1484                                                 "SGI was set in GF+SISO\n");
1485                         }
1486                         search_tbl->is_SGI = !tbl->is_SGI;
1487                         iwl4965_rs_set_expected_tpt_table(lq_sta, search_tbl);
1488                         if (tbl->is_SGI) {
1489                                 s32 tpt = lq_sta->last_tpt / 100;
1490                                 if (tpt >= search_tbl->expected_tpt[index])
1491                                         break;
1492                         }
1493                         search_tbl->current_rate =
1494                                 iwl4965_rate_n_flags_from_tbl(priv, search_tbl,
1495                                                       index, is_green);
1496                         update_search_tbl_counter = 1;
1497                         goto out;
1498                 }
1499                 tbl->action++;
1500                 if (tbl->action > IWL_SISO_SWITCH_GI)
1501                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1502
1503                 if (tbl->action == start_action)
1504                         break;
1505         }
1506         search_tbl->lq_type = LQ_NONE;
1507         return 0;
1508
1509  out:
1510         lq_sta->search_better_tbl = 1;
1511         tbl->action++;
1512         if (tbl->action > IWL_SISO_SWITCH_GI)
1513                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1514         if (update_search_tbl_counter)
1515                 search_tbl->action = tbl->action;
1516
1517         return 0;
1518 }
1519
1520 /*
1521  * Try to switch to new modulation mode from MIMO2
1522  */
1523 static int iwl4965_rs_move_mimo2_to_other(struct iwl_priv *priv,
1524                                  struct iwl_lq_sta *lq_sta,
1525                                  struct ieee80211_conf *conf,
1526                                  struct ieee80211_sta *sta, int index)
1527 {
1528         s8 is_green = lq_sta->is_green;
1529         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1530         struct iwl_scale_tbl_info *search_tbl =
1531                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1532         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1533         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1534         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1535                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1536         u8 start_action;
1537         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1538         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1539         u8 update_search_tbl_counter = 0;
1540         int ret;
1541
1542         start_action = tbl->action;
1543         for (;;) {
1544                 lq_sta->action_counter++;
1545                 switch (tbl->action) {
1546                 case IWL_MIMO2_SWITCH_ANTENNA1:
1547                 case IWL_MIMO2_SWITCH_ANTENNA2:
1548                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1549
1550                         if (tx_chains_num <= 2)
1551                                 break;
1552
1553                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1554                                 break;
1555
1556                         memcpy(search_tbl, tbl, sz);
1557                         if (iwl4965_rs_toggle_antenna(valid_tx_ant,
1558                                        &search_tbl->current_rate, search_tbl)) {
1559                                 update_search_tbl_counter = 1;
1560                                 goto out;
1561                         }
1562                         break;
1563                 case IWL_MIMO2_SWITCH_SISO_A:
1564                 case IWL_MIMO2_SWITCH_SISO_B:
1565                 case IWL_MIMO2_SWITCH_SISO_C:
1566                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1567
1568                         /* Set up new search table for SISO */
1569                         memcpy(search_tbl, tbl, sz);
1570
1571                         if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1572                                 search_tbl->ant_type = ANT_A;
1573                         else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1574                                 search_tbl->ant_type = ANT_B;
1575                         else
1576                                 search_tbl->ant_type = ANT_C;
1577
1578                         if (!iwl4965_rs_is_valid_ant(valid_tx_ant,
1579                                                 search_tbl->ant_type))
1580                                 break;
1581
1582                         ret = iwl4965_rs_switch_to_siso(priv, lq_sta,
1583                                                 conf, sta,
1584                                                  search_tbl, index);
1585                         if (!ret)
1586                                 goto out;
1587
1588                         break;
1589
1590                 case IWL_MIMO2_SWITCH_GI:
1591                         if (!tbl->is_ht40 && !(ht_cap->cap &
1592                                                 IEEE80211_HT_CAP_SGI_20))
1593                                 break;
1594                         if (tbl->is_ht40 && !(ht_cap->cap &
1595                                                 IEEE80211_HT_CAP_SGI_40))
1596                                 break;
1597
1598                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1599
1600                         /* Set up new search table for MIMO2 */
1601                         memcpy(search_tbl, tbl, sz);
1602                         search_tbl->is_SGI = !tbl->is_SGI;
1603                         iwl4965_rs_set_expected_tpt_table(lq_sta, search_tbl);
1604                         /*
1605                          * If active table already uses the fastest possible
1606                          * modulation (dual stream with short guard interval),
1607                          * and it's working well, there's no need to look
1608                          * for a better type of modulation!
1609                          */
1610                         if (tbl->is_SGI) {
1611                                 s32 tpt = lq_sta->last_tpt / 100;
1612                                 if (tpt >= search_tbl->expected_tpt[index])
1613                                         break;
1614                         }
1615                         search_tbl->current_rate =
1616                                 iwl4965_rate_n_flags_from_tbl(priv, search_tbl,
1617                                                       index, is_green);
1618                         update_search_tbl_counter = 1;
1619                         goto out;
1620
1621                 }
1622                 tbl->action++;
1623                 if (tbl->action > IWL_MIMO2_SWITCH_GI)
1624                         tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1625
1626                 if (tbl->action == start_action)
1627                         break;
1628         }
1629         search_tbl->lq_type = LQ_NONE;
1630         return 0;
1631  out:
1632         lq_sta->search_better_tbl = 1;
1633         tbl->action++;
1634         if (tbl->action > IWL_MIMO2_SWITCH_GI)
1635                 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1636         if (update_search_tbl_counter)
1637                 search_tbl->action = tbl->action;
1638
1639         return 0;
1640
1641 }
1642
1643 /*
1644  * Check whether we should continue using same modulation mode, or
1645  * begin search for a new mode, based on:
1646  * 1) # tx successes or failures while using this mode
1647  * 2) # times calling this function
1648  * 3) elapsed time in this mode (not used, for now)
1649  */
1650 static void
1651 iwl4965_rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1652 {
1653         struct iwl_scale_tbl_info *tbl;
1654         int i;
1655         int active_tbl;
1656         int flush_interval_passed = 0;
1657         struct iwl_priv *priv;
1658
1659         priv = lq_sta->drv;
1660         active_tbl = lq_sta->active_tbl;
1661
1662         tbl = &(lq_sta->lq_info[active_tbl]);
1663
1664         /* If we've been disallowing search, see if we should now allow it */
1665         if (lq_sta->stay_in_tbl) {
1666
1667                 /* Elapsed time using current modulation mode */
1668                 if (lq_sta->flush_timer)
1669                         flush_interval_passed =
1670                         time_after(jiffies,
1671                                         (unsigned long)(lq_sta->flush_timer +
1672                                         IWL_RATE_SCALE_FLUSH_INTVL));
1673
1674                 /*
1675                  * Check if we should allow search for new modulation mode.
1676                  * If many frames have failed or succeeded, or we've used
1677                  * this same modulation for a long time, allow search, and
1678                  * reset history stats that keep track of whether we should
1679                  * allow a new search.  Also (below) reset all bitmaps and
1680                  * stats in active history.
1681                  */
1682                 if (force_search ||
1683                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1684                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1685                     ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1686                      && (flush_interval_passed))) {
1687                         IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n:",
1688                                      lq_sta->total_failed,
1689                                      lq_sta->total_success,
1690                                      flush_interval_passed);
1691
1692                         /* Allow search for new mode */
1693                         lq_sta->stay_in_tbl = 0;        /* only place reset */
1694                         lq_sta->total_failed = 0;
1695                         lq_sta->total_success = 0;
1696                         lq_sta->flush_timer = 0;
1697
1698                 /*
1699                  * Else if we've used this modulation mode enough repetitions
1700                  * (regardless of elapsed time or success/failure), reset
1701                  * history bitmaps and rate-specific stats for all rates in
1702                  * active table.
1703                  */
1704                 } else {
1705                         lq_sta->table_count++;
1706                         if (lq_sta->table_count >=
1707                             lq_sta->table_count_limit) {
1708                                 lq_sta->table_count = 0;
1709
1710                                 IWL_DEBUG_RATE(priv,
1711                                         "LQ: stay in table clear win\n");
1712                                 for (i = 0; i < IWL_RATE_COUNT; i++)
1713                                         iwl4965_rs_rate_scale_clear_window(
1714                                                 &(tbl->win[i]));
1715                         }
1716                 }
1717
1718                 /* If transitioning to allow "search", reset all history
1719                  * bitmaps and stats in active table (this will become the new
1720                  * "search" table). */
1721                 if (!lq_sta->stay_in_tbl) {
1722                         for (i = 0; i < IWL_RATE_COUNT; i++)
1723                                 iwl4965_rs_rate_scale_clear_window(
1724                                                         &(tbl->win[i]));
1725                 }
1726         }
1727 }
1728
1729 /*
1730  * setup rate table in uCode
1731  * return rate_n_flags as used in the table
1732  */
1733 static u32 iwl4965_rs_update_rate_tbl(struct iwl_priv *priv,
1734                               struct iwl_rxon_context *ctx,
1735                                 struct iwl_lq_sta *lq_sta,
1736                                 struct iwl_scale_tbl_info *tbl,
1737                                 int index, u8 is_green)
1738 {
1739         u32 rate;
1740
1741         /* Update uCode's rate table. */
1742         rate = iwl4965_rate_n_flags_from_tbl(priv, tbl, index, is_green);
1743         iwl4965_rs_fill_link_cmd(priv, lq_sta, rate);
1744         iwl_legacy_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
1745
1746         return rate;
1747 }
1748
1749 /*
1750  * Do rate scaling and search for new modulation mode.
1751  */
1752 static void iwl4965_rs_rate_scale_perform(struct iwl_priv *priv,
1753                                   struct sk_buff *skb,
1754                                   struct ieee80211_sta *sta,
1755                                   struct iwl_lq_sta *lq_sta)
1756 {
1757         struct ieee80211_hw *hw = priv->hw;
1758         struct ieee80211_conf *conf = &hw->conf;
1759         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1760         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1761         int low = IWL_RATE_INVALID;
1762         int high = IWL_RATE_INVALID;
1763         int index;
1764         int i;
1765         struct iwl_rate_scale_data *window = NULL;
1766         int current_tpt = IWL_INVALID_VALUE;
1767         int low_tpt = IWL_INVALID_VALUE;
1768         int high_tpt = IWL_INVALID_VALUE;
1769         u32 fail_count;
1770         s8 scale_action = 0;
1771         u16 rate_mask;
1772         u8 update_lq = 0;
1773         struct iwl_scale_tbl_info *tbl, *tbl1;
1774         u16 rate_scale_index_msk = 0;
1775         u32 rate;
1776         u8 is_green = 0;
1777         u8 active_tbl = 0;
1778         u8 done_search = 0;
1779         u16 high_low;
1780         s32 sr;
1781         u8 tid = MAX_TID_COUNT;
1782         struct iwl_tid_data *tid_data;
1783         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1784         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1785
1786         IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
1787
1788         /* Send management frames and NO_ACK data using lowest rate. */
1789         /* TODO: this could probably be improved.. */
1790         if (!ieee80211_is_data(hdr->frame_control) ||
1791             info->flags & IEEE80211_TX_CTL_NO_ACK)
1792                 return;
1793
1794         if (!sta || !lq_sta)
1795                 return;
1796
1797         lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
1798
1799         tid = iwl4965_rs_tl_add_packet(lq_sta, hdr);
1800         if ((tid != MAX_TID_COUNT) && (lq_sta->tx_agg_tid_en & (1 << tid))) {
1801                 tid_data = &priv->stations[lq_sta->lq.sta_id].tid[tid];
1802                 if (tid_data->agg.state == IWL_AGG_OFF)
1803                         lq_sta->is_agg = 0;
1804                 else
1805                         lq_sta->is_agg = 1;
1806         } else
1807                 lq_sta->is_agg = 0;
1808
1809         /*
1810          * Select rate-scale / modulation-mode table to work with in
1811          * the rest of this function:  "search" if searching for better
1812          * modulation mode, or "active" if doing rate scaling within a mode.
1813          */
1814         if (!lq_sta->search_better_tbl)
1815                 active_tbl = lq_sta->active_tbl;
1816         else
1817                 active_tbl = 1 - lq_sta->active_tbl;
1818
1819         tbl = &(lq_sta->lq_info[active_tbl]);
1820         if (is_legacy(tbl->lq_type))
1821                 lq_sta->is_green = 0;
1822         else
1823                 lq_sta->is_green = iwl4965_rs_use_green(sta);
1824         is_green = lq_sta->is_green;
1825
1826         /* current tx rate */
1827         index = lq_sta->last_txrate_idx;
1828
1829         IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
1830                        tbl->lq_type);
1831
1832         /* rates available for this association, and for modulation mode */
1833         rate_mask = iwl4965_rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
1834
1835         IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
1836
1837         /* mask with station rate restriction */
1838         if (is_legacy(tbl->lq_type)) {
1839                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1840                         /* supp_rates has no CCK bits in A mode */
1841                         rate_scale_index_msk = (u16) (rate_mask &
1842                                 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1843                 else
1844                         rate_scale_index_msk = (u16) (rate_mask &
1845                                                       lq_sta->supp_rates);
1846
1847         } else
1848                 rate_scale_index_msk = rate_mask;
1849
1850         if (!rate_scale_index_msk)
1851                 rate_scale_index_msk = rate_mask;
1852
1853         if (!((1 << index) & rate_scale_index_msk)) {
1854                 IWL_ERR(priv, "Current Rate is not valid\n");
1855                 if (lq_sta->search_better_tbl) {
1856                         /* revert to active table if search table is not valid*/
1857                         tbl->lq_type = LQ_NONE;
1858                         lq_sta->search_better_tbl = 0;
1859                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1860                         /* get "active" rate info */
1861                         index = iwl4965_hwrate_to_plcp_idx(tbl->current_rate);
1862                         rate = iwl4965_rs_update_rate_tbl(priv, ctx, lq_sta,
1863                                                   tbl, index, is_green);
1864                 }
1865                 return;
1866         }
1867
1868         /* Get expected throughput table and history window for current rate */
1869         if (!tbl->expected_tpt) {
1870                 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
1871                 return;
1872         }
1873
1874         /* force user max rate if set by user */
1875         if ((lq_sta->max_rate_idx != -1) &&
1876             (lq_sta->max_rate_idx < index)) {
1877                 index = lq_sta->max_rate_idx;
1878                 update_lq = 1;
1879                 window = &(tbl->win[index]);
1880                 goto lq_update;
1881         }
1882
1883         window = &(tbl->win[index]);
1884
1885         /*
1886          * If there is not enough history to calculate actual average
1887          * throughput, keep analyzing results of more tx frames, without
1888          * changing rate or mode (bypass most of the rest of this function).
1889          * Set up new rate table in uCode only if old rate is not supported
1890          * in current association (use new rate found above).
1891          */
1892         fail_count = window->counter - window->success_counter;
1893         if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1894                         (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
1895                 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
1896                                "for index %d\n",
1897                                window->success_counter, window->counter, index);
1898
1899                 /* Can't calculate this yet; not enough history */
1900                 window->average_tpt = IWL_INVALID_VALUE;
1901
1902                 /* Should we stay with this modulation mode,
1903                  * or search for a new one? */
1904                 iwl4965_rs_stay_in_table(lq_sta, false);
1905
1906                 goto out;
1907         }
1908         /* Else we have enough samples; calculate estimate of
1909          * actual average throughput */
1910         if (window->average_tpt != ((window->success_ratio *
1911                         tbl->expected_tpt[index] + 64) / 128)) {
1912                 IWL_ERR(priv,
1913                          "expected_tpt should have been calculated by now\n");
1914                 window->average_tpt = ((window->success_ratio *
1915                                         tbl->expected_tpt[index] + 64) / 128);
1916         }
1917
1918         /* If we are searching for better modulation mode, check success. */
1919         if (lq_sta->search_better_tbl) {
1920                 /* If good success, continue using the "search" mode;
1921                  * no need to send new link quality command, since we're
1922                  * continuing to use the setup that we've been trying. */
1923                 if (window->average_tpt > lq_sta->last_tpt) {
1924
1925                         IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
1926                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
1927                                         window->success_ratio,
1928                                         window->average_tpt,
1929                                         lq_sta->last_tpt);
1930
1931                         if (!is_legacy(tbl->lq_type))
1932                                 lq_sta->enable_counter = 1;
1933
1934                         /* Swap tables; "search" becomes "active" */
1935                         lq_sta->active_tbl = active_tbl;
1936                         current_tpt = window->average_tpt;
1937
1938                 /* Else poor success; go back to mode in "active" table */
1939                 } else {
1940
1941                         IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
1942                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
1943                                         window->success_ratio,
1944                                         window->average_tpt,
1945                                         lq_sta->last_tpt);
1946
1947                         /* Nullify "search" table */
1948                         tbl->lq_type = LQ_NONE;
1949
1950                         /* Revert to "active" table */
1951                         active_tbl = lq_sta->active_tbl;
1952                         tbl = &(lq_sta->lq_info[active_tbl]);
1953
1954                         /* Revert to "active" rate and throughput info */
1955                         index = iwl4965_hwrate_to_plcp_idx(tbl->current_rate);
1956                         current_tpt = lq_sta->last_tpt;
1957
1958                         /* Need to set up a new rate table in uCode */
1959                         update_lq = 1;
1960                 }
1961
1962                 /* Either way, we've made a decision; modulation mode
1963                  * search is done, allow rate adjustment next time. */
1964                 lq_sta->search_better_tbl = 0;
1965                 done_search = 1;        /* Don't switch modes below! */
1966                 goto lq_update;
1967         }
1968
1969         /* (Else) not in search of better modulation mode, try for better
1970          * starting rate, while staying in this mode. */
1971         high_low = iwl4965_rs_get_adjacent_rate(priv, index,
1972                                         rate_scale_index_msk,
1973                                         tbl->lq_type);
1974         low = high_low & 0xff;
1975         high = (high_low >> 8) & 0xff;
1976
1977         /* If user set max rate, dont allow higher than user constrain */
1978         if ((lq_sta->max_rate_idx != -1) &&
1979             (lq_sta->max_rate_idx < high))
1980                 high = IWL_RATE_INVALID;
1981
1982         sr = window->success_ratio;
1983
1984         /* Collect measured throughputs for current and adjacent rates */
1985         current_tpt = window->average_tpt;
1986         if (low != IWL_RATE_INVALID)
1987                 low_tpt = tbl->win[low].average_tpt;
1988         if (high != IWL_RATE_INVALID)
1989                 high_tpt = tbl->win[high].average_tpt;
1990
1991         scale_action = 0;
1992
1993         /* Too many failures, decrease rate */
1994         if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
1995                 IWL_DEBUG_RATE(priv,
1996                         "decrease rate because of low success_ratio\n");
1997                 scale_action = -1;
1998
1999         /* No throughput measured yet for adjacent rates; try increase. */
2000         } else if ((low_tpt == IWL_INVALID_VALUE) &&
2001                    (high_tpt == IWL_INVALID_VALUE)) {
2002
2003                 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2004                         scale_action = 1;
2005                 else if (low != IWL_RATE_INVALID)
2006                         scale_action = 0;
2007         }
2008
2009         /* Both adjacent throughputs are measured, but neither one has better
2010          * throughput; we're using the best rate, don't change it! */
2011         else if ((low_tpt != IWL_INVALID_VALUE) &&
2012                  (high_tpt != IWL_INVALID_VALUE) &&
2013                  (low_tpt < current_tpt) &&
2014                  (high_tpt < current_tpt))
2015                 scale_action = 0;
2016
2017         /* At least one adjacent rate's throughput is measured,
2018          * and may have better performance. */
2019         else {
2020                 /* Higher adjacent rate's throughput is measured */
2021                 if (high_tpt != IWL_INVALID_VALUE) {
2022                         /* Higher rate has better throughput */
2023                         if (high_tpt > current_tpt &&
2024                                         sr >= IWL_RATE_INCREASE_TH) {
2025                                 scale_action = 1;
2026                         } else {
2027                                 scale_action = 0;
2028                         }
2029
2030                 /* Lower adjacent rate's throughput is measured */
2031                 } else if (low_tpt != IWL_INVALID_VALUE) {
2032                         /* Lower rate has better throughput */
2033                         if (low_tpt > current_tpt) {
2034                                 IWL_DEBUG_RATE(priv,
2035                                     "decrease rate because of low tpt\n");
2036                                 scale_action = -1;
2037                         } else if (sr >= IWL_RATE_INCREASE_TH) {
2038                                 scale_action = 1;
2039                         }
2040                 }
2041         }
2042
2043         /* Sanity check; asked for decrease, but success rate or throughput
2044          * has been good at old rate.  Don't change it. */
2045         if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2046                     ((sr > IWL_RATE_HIGH_TH) ||
2047                      (current_tpt > (100 * tbl->expected_tpt[low]))))
2048                 scale_action = 0;
2049
2050         switch (scale_action) {
2051         case -1:
2052                 /* Decrease starting rate, update uCode's rate table */
2053                 if (low != IWL_RATE_INVALID) {
2054                         update_lq = 1;
2055                         index = low;
2056                 }
2057
2058                 break;
2059         case 1:
2060                 /* Increase starting rate, update uCode's rate table */
2061                 if (high != IWL_RATE_INVALID) {
2062                         update_lq = 1;
2063                         index = high;
2064                 }
2065
2066                 break;
2067         case 0:
2068                 /* No change */
2069         default:
2070                 break;
2071         }
2072
2073         IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2074                     "high %d type %d\n",
2075                      index, scale_action, low, high, tbl->lq_type);
2076
2077 lq_update:
2078         /* Replace uCode's rate table for the destination station. */
2079         if (update_lq)
2080                 rate = iwl4965_rs_update_rate_tbl(priv, ctx, lq_sta,
2081                                           tbl, index, is_green);
2082
2083         /* Should we stay with this modulation mode,
2084          * or search for a new one? */
2085          iwl4965_rs_stay_in_table(lq_sta, false);
2086
2087         /*
2088          * Search for new modulation mode if we're:
2089          * 1)  Not changing rates right now
2090          * 2)  Not just finishing up a search
2091          * 3)  Allowing a new search
2092          */
2093         if (!update_lq && !done_search &&
2094                 !lq_sta->stay_in_tbl && window->counter) {
2095                 /* Save current throughput to compare with "search" throughput*/
2096                 lq_sta->last_tpt = current_tpt;
2097
2098                 /* Select a new "search" modulation mode to try.
2099                  * If one is found, set up the new "search" table. */
2100                 if (is_legacy(tbl->lq_type))
2101                         iwl4965_rs_move_legacy_other(priv, lq_sta,
2102                                                         conf, sta, index);
2103                 else if (is_siso(tbl->lq_type))
2104                         iwl4965_rs_move_siso_to_other(priv, lq_sta,
2105                                                         conf, sta, index);
2106                 else /* (is_mimo2(tbl->lq_type)) */
2107                         iwl4965_rs_move_mimo2_to_other(priv, lq_sta,
2108                                                         conf, sta, index);
2109
2110                 /* If new "search" mode was selected, set up in uCode table */
2111                 if (lq_sta->search_better_tbl) {
2112                         /* Access the "search" table, clear its history. */
2113                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2114                         for (i = 0; i < IWL_RATE_COUNT; i++)
2115                                 iwl4965_rs_rate_scale_clear_window(
2116                                                         &(tbl->win[i]));
2117
2118                         /* Use new "search" start rate */
2119                         index = iwl4965_hwrate_to_plcp_idx(tbl->current_rate);
2120
2121                         IWL_DEBUG_RATE(priv,
2122                                 "Switch current  mcs: %X index: %d\n",
2123                                      tbl->current_rate, index);
2124                         iwl4965_rs_fill_link_cmd(priv, lq_sta,
2125                                                 tbl->current_rate);
2126                         iwl_legacy_send_lq_cmd(priv, ctx,
2127                                                 &lq_sta->lq, CMD_ASYNC, false);
2128                 } else
2129                         done_search = 1;
2130         }
2131
2132         if (done_search && !lq_sta->stay_in_tbl) {
2133                 /* If the "active" (non-search) mode was legacy,
2134                  * and we've tried switching antennas,
2135                  * but we haven't been able to try HT modes (not available),
2136                  * stay with best antenna legacy modulation for a while
2137                  * before next round of mode comparisons. */
2138                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2139                 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2140                     lq_sta->action_counter > tbl1->max_search) {
2141                         IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2142                         iwl4965_rs_set_stay_in_table(priv, 1, lq_sta);
2143                 }
2144
2145                 /* If we're in an HT mode, and all 3 mode switch actions
2146                  * have been tried and compared, stay in this best modulation
2147                  * mode for a while before next round of mode comparisons. */
2148                 if (lq_sta->enable_counter &&
2149                     (lq_sta->action_counter >= tbl1->max_search)) {
2150                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2151                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2152                             (tid != MAX_TID_COUNT)) {
2153                                 tid_data =
2154                                    &priv->stations[lq_sta->lq.sta_id].tid[tid];
2155                                 if (tid_data->agg.state == IWL_AGG_OFF) {
2156                                         IWL_DEBUG_RATE(priv,
2157                                                        "try to aggregate tid %d\n",
2158                                                        tid);
2159                                         iwl4965_rs_tl_turn_on_agg(priv, tid,
2160                                                           lq_sta, sta);
2161                                 }
2162                         }
2163                         iwl4965_rs_set_stay_in_table(priv, 0, lq_sta);
2164                 }
2165         }
2166
2167 out:
2168         tbl->current_rate = iwl4965_rate_n_flags_from_tbl(priv, tbl,
2169                                                         index, is_green);
2170         i = index;
2171         lq_sta->last_txrate_idx = i;
2172 }
2173
2174 /**
2175  * iwl4965_rs_initialize_lq - Initialize a station's hardware rate table
2176  *
2177  * The uCode's station table contains a table of fallback rates
2178  * for automatic fallback during transmission.
2179  *
2180  * NOTE: This sets up a default set of values.  These will be replaced later
2181  *       if the driver's iwl-4965-rs rate scaling algorithm is used, instead of
2182  *       rc80211_simple.
2183  *
2184  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2185  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2186  *       which requires station table entry to exist).
2187  */
2188 static void iwl4965_rs_initialize_lq(struct iwl_priv *priv,
2189                              struct ieee80211_conf *conf,
2190                              struct ieee80211_sta *sta,
2191                              struct iwl_lq_sta *lq_sta)
2192 {
2193         struct iwl_scale_tbl_info *tbl;
2194         int rate_idx;
2195         int i;
2196         u32 rate;
2197         u8 use_green = iwl4965_rs_use_green(sta);
2198         u8 active_tbl = 0;
2199         u8 valid_tx_ant;
2200         struct iwl_station_priv *sta_priv;
2201         struct iwl_rxon_context *ctx;
2202
2203         if (!sta || !lq_sta)
2204                 return;
2205
2206         sta_priv = (void *)sta->drv_priv;
2207         ctx = sta_priv->common.ctx;
2208
2209         i = lq_sta->last_txrate_idx;
2210
2211         valid_tx_ant = priv->hw_params.valid_tx_ant;
2212
2213         if (!lq_sta->search_better_tbl)
2214                 active_tbl = lq_sta->active_tbl;
2215         else
2216                 active_tbl = 1 - lq_sta->active_tbl;
2217
2218         tbl = &(lq_sta->lq_info[active_tbl]);
2219
2220         if ((i < 0) || (i >= IWL_RATE_COUNT))
2221                 i = 0;
2222
2223         rate = iwlegacy_rates[i].plcp;
2224         tbl->ant_type = iwl4965_first_antenna(valid_tx_ant);
2225         rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2226
2227         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2228                 rate |= RATE_MCS_CCK_MSK;
2229
2230         iwl4965_rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2231         if (!iwl4965_rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2232                 iwl4965_rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2233
2234         rate = iwl4965_rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2235         tbl->current_rate = rate;
2236         iwl4965_rs_set_expected_tpt_table(lq_sta, tbl);
2237         iwl4965_rs_fill_link_cmd(NULL, lq_sta, rate);
2238         priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2239         iwl_legacy_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_SYNC, true);
2240 }
2241
2242 static void
2243 iwl4965_rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2244                         struct ieee80211_tx_rate_control *txrc)
2245 {
2246
2247         struct sk_buff *skb = txrc->skb;
2248         struct ieee80211_supported_band *sband = txrc->sband;
2249         struct iwl_priv *priv __maybe_unused = (struct iwl_priv *)priv_r;
2250         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2251         struct iwl_lq_sta *lq_sta = priv_sta;
2252         int rate_idx;
2253
2254         IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2255
2256         /* Get max rate if user set max rate */
2257         if (lq_sta) {
2258                 lq_sta->max_rate_idx = txrc->max_rate_idx;
2259                 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2260                     (lq_sta->max_rate_idx != -1))
2261                         lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2262                 if ((lq_sta->max_rate_idx < 0) ||
2263                     (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2264                         lq_sta->max_rate_idx = -1;
2265         }
2266
2267         /* Treat uninitialized rate scaling data same as non-existing. */
2268         if (lq_sta && !lq_sta->drv) {
2269                 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
2270                 priv_sta = NULL;
2271         }
2272
2273         /* Send management frames and NO_ACK data using lowest rate. */
2274         if (rate_control_send_low(sta, priv_sta, txrc))
2275                 return;
2276
2277         if (!lq_sta)
2278                 return;
2279
2280         rate_idx  = lq_sta->last_txrate_idx;
2281
2282         if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2283                 rate_idx -= IWL_FIRST_OFDM_RATE;
2284                 /* 6M and 9M shared same MCS index */
2285                 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2286                 if (iwl4965_rs_extract_rate(lq_sta->last_rate_n_flags) >=
2287                          IWL_RATE_MIMO2_6M_PLCP)
2288                         rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2289                 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2290                 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2291                         info->control.rates[0].flags |=
2292                                         IEEE80211_TX_RC_SHORT_GI;
2293                 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2294                         info->control.rates[0].flags |=
2295                                         IEEE80211_TX_RC_DUP_DATA;
2296                 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2297                         info->control.rates[0].flags |=
2298                                         IEEE80211_TX_RC_40_MHZ_WIDTH;
2299                 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2300                         info->control.rates[0].flags |=
2301                                         IEEE80211_TX_RC_GREEN_FIELD;
2302         } else {
2303                 /* Check for invalid rates */
2304                 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2305                                 ((sband->band == IEEE80211_BAND_5GHZ) &&
2306                                  (rate_idx < IWL_FIRST_OFDM_RATE)))
2307                         rate_idx = rate_lowest_index(sband, sta);
2308                 /* On valid 5 GHz rate, adjust index */
2309                 else if (sband->band == IEEE80211_BAND_5GHZ)
2310                         rate_idx -= IWL_FIRST_OFDM_RATE;
2311                 info->control.rates[0].flags = 0;
2312         }
2313         info->control.rates[0].idx = rate_idx;
2314
2315 }
2316
2317 static void *iwl4965_rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2318                           gfp_t gfp)
2319 {
2320         struct iwl_lq_sta *lq_sta;
2321         struct iwl_station_priv *sta_priv =
2322                                 (struct iwl_station_priv *) sta->drv_priv;
2323         struct iwl_priv *priv;
2324
2325         priv = (struct iwl_priv *)priv_rate;
2326         IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2327
2328         lq_sta = &sta_priv->lq_sta;
2329
2330         return lq_sta;
2331 }
2332
2333 /*
2334  * Called after adding a new station to initialize rate scaling
2335  */
2336 void
2337 iwl4965_rs_rate_init(struct iwl_priv *priv,
2338                         struct ieee80211_sta *sta,
2339                         u8 sta_id)
2340 {
2341         int i, j;
2342         struct ieee80211_hw *hw = priv->hw;
2343         struct ieee80211_conf *conf = &priv->hw->conf;
2344         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2345         struct iwl_station_priv *sta_priv;
2346         struct iwl_lq_sta *lq_sta;
2347         struct ieee80211_supported_band *sband;
2348
2349         sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2350         lq_sta = &sta_priv->lq_sta;
2351         sband = hw->wiphy->bands[conf->channel->band];
2352
2353
2354         lq_sta->lq.sta_id = sta_id;
2355
2356         for (j = 0; j < LQ_SIZE; j++)
2357                 for (i = 0; i < IWL_RATE_COUNT; i++)
2358                         iwl4965_rs_rate_scale_clear_window(
2359                                         &lq_sta->lq_info[j].win[i]);
2360
2361         lq_sta->flush_timer = 0;
2362         lq_sta->supp_rates = sta->supp_rates[sband->band];
2363         for (j = 0; j < LQ_SIZE; j++)
2364                 for (i = 0; i < IWL_RATE_COUNT; i++)
2365                         iwl4965_rs_rate_scale_clear_window(
2366                                         &lq_sta->lq_info[j].win[i]);
2367
2368         IWL_DEBUG_RATE(priv, "LQ:"
2369                         "*** rate scale station global init for station %d ***\n",
2370                        sta_id);
2371         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2372          * the lowest or the highest rate.. Could consider using RSSI from
2373          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2374          * after assoc.. */
2375
2376         lq_sta->is_dup = 0;
2377         lq_sta->max_rate_idx = -1;
2378         lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2379         lq_sta->is_green = iwl4965_rs_use_green(sta);
2380         lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2381         lq_sta->band = priv->band;
2382         /*
2383          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2384          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2385          */
2386         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2387         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2388         lq_sta->active_siso_rate &= ~((u16)0x2);
2389         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2390
2391         /* Same here */
2392         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2393         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2394         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2395         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2396
2397         /* These values will be overridden later */
2398         lq_sta->lq.general_params.single_stream_ant_msk =
2399                 iwl4965_first_antenna(priv->hw_params.valid_tx_ant);
2400         lq_sta->lq.general_params.dual_stream_ant_msk =
2401                 priv->hw_params.valid_tx_ant &
2402                 ~iwl4965_first_antenna(priv->hw_params.valid_tx_ant);
2403         if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2404                 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2405         } else if (iwl4965_num_of_ant(priv->hw_params.valid_tx_ant) == 2) {
2406                 lq_sta->lq.general_params.dual_stream_ant_msk =
2407                         priv->hw_params.valid_tx_ant;
2408         }
2409
2410         /* as default allow aggregation for all tids */
2411         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2412         lq_sta->drv = priv;
2413
2414         /* Set last_txrate_idx to lowest rate */
2415         lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2416         if (sband->band == IEEE80211_BAND_5GHZ)
2417                 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2418         lq_sta->is_agg = 0;
2419
2420 #ifdef CONFIG_MAC80211_DEBUGFS
2421         lq_sta->dbg_fixed_rate = 0;
2422 #endif
2423
2424         iwl4965_rs_initialize_lq(priv, conf, sta, lq_sta);
2425 }
2426
2427 static void iwl4965_rs_fill_link_cmd(struct iwl_priv *priv,
2428                              struct iwl_lq_sta *lq_sta, u32 new_rate)
2429 {
2430         struct iwl_scale_tbl_info tbl_type;
2431         int index = 0;
2432         int rate_idx;
2433         int repeat_rate = 0;
2434         u8 ant_toggle_cnt = 0;
2435         u8 use_ht_possible = 1;
2436         u8 valid_tx_ant = 0;
2437         struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2438
2439         /* Override starting rate (index 0) if needed for debug purposes */
2440         iwl4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2441
2442         /* Interpret new_rate (rate_n_flags) */
2443         iwl4965_rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2444                                   &tbl_type, &rate_idx);
2445
2446         /* How many times should we repeat the initial rate? */
2447         if (is_legacy(tbl_type.lq_type)) {
2448                 ant_toggle_cnt = 1;
2449                 repeat_rate = IWL_NUMBER_TRY;
2450         } else {
2451                 repeat_rate = IWL_HT_NUMBER_TRY;
2452         }
2453
2454         lq_cmd->general_params.mimo_delimiter =
2455                         is_mimo(tbl_type.lq_type) ? 1 : 0;
2456
2457         /* Fill 1st table entry (index 0) */
2458         lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2459
2460         if (iwl4965_num_of_ant(tbl_type.ant_type) == 1) {
2461                 lq_cmd->general_params.single_stream_ant_msk =
2462                                                 tbl_type.ant_type;
2463         } else if (iwl4965_num_of_ant(tbl_type.ant_type) == 2) {
2464                 lq_cmd->general_params.dual_stream_ant_msk =
2465                                                 tbl_type.ant_type;
2466         } /* otherwise we don't modify the existing value */
2467
2468         index++;
2469         repeat_rate--;
2470         if (priv)
2471                 valid_tx_ant = priv->hw_params.valid_tx_ant;
2472
2473         /* Fill rest of rate table */
2474         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2475                 /* Repeat initial/next rate.
2476                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2477                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2478                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2479                         if (is_legacy(tbl_type.lq_type)) {
2480                                 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2481                                         ant_toggle_cnt++;
2482                                 else if (priv &&
2483                                          iwl4965_rs_toggle_antenna(valid_tx_ant,
2484                                                         &new_rate, &tbl_type))
2485                                         ant_toggle_cnt = 1;
2486                         }
2487
2488                         /* Override next rate if needed for debug purposes */
2489                         iwl4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2490
2491                         /* Fill next table entry */
2492                         lq_cmd->rs_table[index].rate_n_flags =
2493                                         cpu_to_le32(new_rate);
2494                         repeat_rate--;
2495                         index++;
2496                 }
2497
2498                 iwl4965_rs_get_tbl_info_from_mcs(new_rate,
2499                                                 lq_sta->band, &tbl_type,
2500                                                 &rate_idx);
2501
2502                 /* Indicate to uCode which entries might be MIMO.
2503                  * If initial rate was MIMO, this will finally end up
2504                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2505                 if (is_mimo(tbl_type.lq_type))
2506                         lq_cmd->general_params.mimo_delimiter = index;
2507
2508                 /* Get next rate */
2509                 new_rate = iwl4965_rs_get_lower_rate(lq_sta,
2510                                         &tbl_type, rate_idx,
2511                                              use_ht_possible);
2512
2513                 /* How many times should we repeat the next rate? */
2514                 if (is_legacy(tbl_type.lq_type)) {
2515                         if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2516                                 ant_toggle_cnt++;
2517                         else if (priv &&
2518                                  iwl4965_rs_toggle_antenna(valid_tx_ant,
2519                                                    &new_rate, &tbl_type))
2520                                 ant_toggle_cnt = 1;
2521
2522                         repeat_rate = IWL_NUMBER_TRY;
2523                 } else {
2524                         repeat_rate = IWL_HT_NUMBER_TRY;
2525                 }
2526
2527                 /* Don't allow HT rates after next pass.
2528                  * iwl4965_rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2529                 use_ht_possible = 0;
2530
2531                 /* Override next rate if needed for debug purposes */
2532                 iwl4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2533
2534                 /* Fill next table entry */
2535                 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2536
2537                 index++;
2538                 repeat_rate--;
2539         }
2540
2541         lq_cmd->agg_params.agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2542         lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2543
2544         lq_cmd->agg_params.agg_time_limit =
2545                 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2546 }
2547
2548 static void
2549 *iwl4965_rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2550 {
2551         return hw->priv;
2552 }
2553 /* rate scale requires free function to be implemented */
2554 static void iwl4965_rs_free(void *priv_rate)
2555 {
2556         return;
2557 }
2558
2559 static void iwl4965_rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
2560                         void *priv_sta)
2561 {
2562         struct iwl_priv *priv __maybe_unused = priv_r;
2563
2564         IWL_DEBUG_RATE(priv, "enter\n");
2565         IWL_DEBUG_RATE(priv, "leave\n");
2566 }
2567
2568
2569 #ifdef CONFIG_MAC80211_DEBUGFS
2570 static int iwl4965_open_file_generic(struct inode *inode, struct file *file)
2571 {
2572         file->private_data = inode->i_private;
2573         return 0;
2574 }
2575 static void iwl4965_rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2576                              u32 *rate_n_flags, int index)
2577 {
2578         struct iwl_priv *priv;
2579         u8 valid_tx_ant;
2580         u8 ant_sel_tx;
2581
2582         priv = lq_sta->drv;
2583         valid_tx_ant = priv->hw_params.valid_tx_ant;
2584         if (lq_sta->dbg_fixed_rate) {
2585                 ant_sel_tx =
2586                   ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
2587                   >> RATE_MCS_ANT_POS);
2588                 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
2589                         *rate_n_flags = lq_sta->dbg_fixed_rate;
2590                         IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
2591                 } else {
2592                         lq_sta->dbg_fixed_rate = 0;
2593                         IWL_ERR(priv,
2594                             "Invalid antenna selection 0x%X, Valid is 0x%X\n",
2595                             ant_sel_tx, valid_tx_ant);
2596                         IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
2597                 }
2598         } else {
2599                 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
2600         }
2601 }
2602
2603 static ssize_t iwl4965_rs_sta_dbgfs_scale_table_write(struct file *file,
2604                         const char __user *user_buf, size_t count, loff_t *ppos)
2605 {
2606         struct iwl_lq_sta *lq_sta = file->private_data;
2607         struct iwl_priv *priv;
2608         char buf[64];
2609         size_t buf_size;
2610         u32 parsed_rate;
2611         struct iwl_station_priv *sta_priv =
2612                 container_of(lq_sta, struct iwl_station_priv, lq_sta);
2613         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
2614
2615         priv = lq_sta->drv;
2616         memset(buf, 0, sizeof(buf));
2617         buf_size = min(count, sizeof(buf) -  1);
2618         if (copy_from_user(buf, user_buf, buf_size))
2619                 return -EFAULT;
2620
2621         if (sscanf(buf, "%x", &parsed_rate) == 1)
2622                 lq_sta->dbg_fixed_rate = parsed_rate;
2623         else
2624                 lq_sta->dbg_fixed_rate = 0;
2625
2626         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
2627         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2628         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2629
2630         IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
2631                 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2632
2633         if (lq_sta->dbg_fixed_rate) {
2634                 iwl4965_rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2635                 iwl_legacy_send_lq_cmd(lq_sta->drv, ctx, &lq_sta->lq, CMD_ASYNC,
2636                                 false);
2637         }
2638
2639         return count;
2640 }
2641
2642 static ssize_t iwl4965_rs_sta_dbgfs_scale_table_read(struct file *file,
2643                         char __user *user_buf, size_t count, loff_t *ppos)
2644 {
2645         char *buff;
2646         int desc = 0;
2647         int i = 0;
2648         int index = 0;
2649         ssize_t ret;
2650
2651         struct iwl_lq_sta *lq_sta = file->private_data;
2652         struct iwl_priv *priv;
2653         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2654
2655         priv = lq_sta->drv;
2656         buff = kmalloc(1024, GFP_KERNEL);
2657         if (!buff)
2658                 return -ENOMEM;
2659
2660         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2661         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2662                         lq_sta->total_failed, lq_sta->total_success,
2663                         lq_sta->active_legacy_rate);
2664         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2665                         lq_sta->dbg_fixed_rate);
2666         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
2667             (priv->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
2668             (priv->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
2669             (priv->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
2670         desc += sprintf(buff+desc, "lq type %s\n",
2671            (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
2672         if (is_Ht(tbl->lq_type)) {
2673                 desc += sprintf(buff+desc, " %s",
2674                    (is_siso(tbl->lq_type)) ? "SISO" : "MIMO2");
2675                    desc += sprintf(buff+desc, " %s",
2676                    (tbl->is_ht40) ? "40MHz" : "20MHz");
2677                    desc += sprintf(buff+desc, " %s %s %s\n",
2678                         (tbl->is_SGI) ? "SGI" : "",
2679                    (lq_sta->is_green) ? "GF enabled" : "",
2680                    (lq_sta->is_agg) ? "AGG on" : "");
2681         }
2682         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
2683                 lq_sta->last_rate_n_flags);
2684         desc += sprintf(buff+desc, "general:"
2685                 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2686                 lq_sta->lq.general_params.flags,
2687                 lq_sta->lq.general_params.mimo_delimiter,
2688                 lq_sta->lq.general_params.single_stream_ant_msk,
2689                 lq_sta->lq.general_params.dual_stream_ant_msk);
2690
2691         desc += sprintf(buff+desc, "agg:"
2692                         "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2693                         le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2694                         lq_sta->lq.agg_params.agg_dis_start_th,
2695                         lq_sta->lq.agg_params.agg_frame_cnt_limit);
2696
2697         desc += sprintf(buff+desc,
2698                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2699                         lq_sta->lq.general_params.start_rate_index[0],
2700                         lq_sta->lq.general_params.start_rate_index[1],
2701                         lq_sta->lq.general_params.start_rate_index[2],
2702                         lq_sta->lq.general_params.start_rate_index[3]);
2703
2704         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2705                 index = iwl4965_hwrate_to_plcp_idx(
2706                         le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2707                 if (is_legacy(tbl->lq_type)) {
2708                         desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
2709                         i,
2710                         le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
2711                         iwl_rate_mcs[index].mbps);
2712                 } else {
2713                         desc += sprintf(buff+desc,
2714                         " rate[%d] 0x%X %smbps (%s)\n",
2715                         i,
2716                         le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
2717                         iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
2718                 }
2719         }
2720
2721         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2722         kfree(buff);
2723         return ret;
2724 }
2725
2726 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2727         .write = iwl4965_rs_sta_dbgfs_scale_table_write,
2728         .read = iwl4965_rs_sta_dbgfs_scale_table_read,
2729         .open = iwl4965_open_file_generic,
2730         .llseek = default_llseek,
2731 };
2732 static ssize_t iwl4965_rs_sta_dbgfs_stats_table_read(struct file *file,
2733                         char __user *user_buf, size_t count, loff_t *ppos)
2734 {
2735         char *buff;
2736         int desc = 0;
2737         int i, j;
2738         ssize_t ret;
2739
2740         struct iwl_lq_sta *lq_sta = file->private_data;
2741
2742         buff = kmalloc(1024, GFP_KERNEL);
2743         if (!buff)
2744                 return -ENOMEM;
2745
2746         for (i = 0; i < LQ_SIZE; i++) {
2747                 desc += sprintf(buff+desc,
2748                                 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
2749                                 "rate=0x%X\n",
2750                                 lq_sta->active_tbl == i ? "*" : "x",
2751                                 lq_sta->lq_info[i].lq_type,
2752                                 lq_sta->lq_info[i].is_SGI,
2753                                 lq_sta->lq_info[i].is_ht40,
2754                                 lq_sta->lq_info[i].is_dup,
2755                                 lq_sta->is_green,
2756                                 lq_sta->lq_info[i].current_rate);
2757                 for (j = 0; j < IWL_RATE_COUNT; j++) {
2758                         desc += sprintf(buff+desc,
2759                                 "counter=%d success=%d %%=%d\n",
2760                                 lq_sta->lq_info[i].win[j].counter,
2761                                 lq_sta->lq_info[i].win[j].success_counter,
2762                                 lq_sta->lq_info[i].win[j].success_ratio);
2763                 }
2764         }
2765         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2766         kfree(buff);
2767         return ret;
2768 }
2769
2770 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2771         .read = iwl4965_rs_sta_dbgfs_stats_table_read,
2772         .open = iwl4965_open_file_generic,
2773         .llseek = default_llseek,
2774 };
2775
2776 static ssize_t iwl4965_rs_sta_dbgfs_rate_scale_data_read(struct file *file,
2777                         char __user *user_buf, size_t count, loff_t *ppos)
2778 {
2779         char buff[120];
2780         int desc = 0;
2781         ssize_t ret;
2782
2783         struct iwl_lq_sta *lq_sta = file->private_data;
2784         struct iwl_priv *priv;
2785         struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
2786
2787         priv = lq_sta->drv;
2788
2789         if (is_Ht(tbl->lq_type))
2790                 desc += sprintf(buff+desc,
2791                                 "Bit Rate= %d Mb/s\n",
2792                                 tbl->expected_tpt[lq_sta->last_txrate_idx]);
2793         else
2794                 desc += sprintf(buff+desc,
2795                                 "Bit Rate= %d Mb/s\n",
2796                                 iwlegacy_rates[lq_sta->last_txrate_idx].ieee >> 1);
2797
2798         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2799         return ret;
2800 }
2801
2802 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
2803         .read = iwl4965_rs_sta_dbgfs_rate_scale_data_read,
2804         .open = iwl4965_open_file_generic,
2805         .llseek = default_llseek,
2806 };
2807
2808 static void iwl4965_rs_add_debugfs(void *priv, void *priv_sta,
2809                                         struct dentry *dir)
2810 {
2811         struct iwl_lq_sta *lq_sta = priv_sta;
2812         lq_sta->rs_sta_dbgfs_scale_table_file =
2813                 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
2814                                 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2815         lq_sta->rs_sta_dbgfs_stats_table_file =
2816                 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
2817                         lq_sta, &rs_sta_dbgfs_stats_table_ops);
2818         lq_sta->rs_sta_dbgfs_rate_scale_data_file =
2819                 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
2820                         lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
2821         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2822                 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
2823                 &lq_sta->tx_agg_tid_en);
2824
2825 }
2826
2827 static void iwl4965_rs_remove_debugfs(void *priv, void *priv_sta)
2828 {
2829         struct iwl_lq_sta *lq_sta = priv_sta;
2830         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2831         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2832         debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
2833         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2834 }
2835 #endif
2836
2837 /*
2838  * Initialization of rate scaling information is done by driver after
2839  * the station is added. Since mac80211 calls this function before a
2840  * station is added we ignore it.
2841  */
2842 static void
2843 iwl4965_rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband,
2844                          struct ieee80211_sta *sta, void *priv_sta)
2845 {
2846 }
2847 static struct rate_control_ops rs_4965_ops = {
2848         .module = NULL,
2849         .name = IWL4965_RS_NAME,
2850         .tx_status = iwl4965_rs_tx_status,
2851         .get_rate = iwl4965_rs_get_rate,
2852         .rate_init = iwl4965_rs_rate_init_stub,
2853         .alloc = iwl4965_rs_alloc,
2854         .free = iwl4965_rs_free,
2855         .alloc_sta = iwl4965_rs_alloc_sta,
2856         .free_sta = iwl4965_rs_free_sta,
2857 #ifdef CONFIG_MAC80211_DEBUGFS
2858         .add_sta_debugfs = iwl4965_rs_add_debugfs,
2859         .remove_sta_debugfs = iwl4965_rs_remove_debugfs,
2860 #endif
2861 };
2862
2863 int iwl4965_rate_control_register(void)
2864 {
2865         return ieee80211_rate_control_register(&rs_4965_ops);
2866 }
2867
2868 void iwl4965_rate_control_unregister(void)
2869 {
2870         ieee80211_rate_control_unregister(&rs_4965_ops);
2871 }