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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2007 Intel Corporation. All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  * Contact Information:
  22  * James P. Ketrenos <ipw2100-admin@linux.intel.com>
  23  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  24  *
  25  *****************************************************************************/
  26 #include <linux/kernel.h>
  27 #include <linux/init.h>
  28 #include <linux/skbuff.h>
  29 #include <linux/wireless.h>
  30 #include <net/mac80211.h>
  31 #include <net/ieee80211.h>
  32
  33 #include <linux/netdevice.h>
  34 #include <linux/etherdevice.h>
  35 #include <linux/delay.h>
  36
  37 #include <linux/workqueue.h>
  38
  39 #define IWL 4965
  40
  41 #include "../net/mac80211/ieee80211_rate.h"
  42
  43 #include "iwlwifi.h"
  44 #include "iwl-helpers.h"
  45
  46 #define RS_NAME "iwl-4965-rs"
  47
  48 #define NUM_TRY_BEFORE_ANTENNA_TOGGLE 1
  49 #define IWL_NUMBER_TRY      1
  50 #define IWL_HT_NUMBER_TRY   3
  51
  52 #define IWL_RATE_MAX_WINDOW             62
  53 #define IWL_RATE_HIGH_TH                10880
  54 #define IWL_RATE_MIN_FAILURE_TH         6
  55 #define IWL_RATE_MIN_SUCCESS_TH         8
  56 #define IWL_RATE_DECREASE_TH            1920
  57 #define IWL_RATE_INCREASE_TH            8960
  58 #define IWL_RATE_SCALE_FLUSH_INTVL   (2*HZ)        /*2 seconds */
  59
  60 static u8 rs_ht_to_legacy[] = {
  61         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  62         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  63         IWL_RATE_6M_INDEX,
  64         IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
  65         IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
  66         IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
  67         IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
  68 };
  69
  70 struct iwl_rate {
  71         u32 rate_n_flags;
  72 } __attribute__ ((packed));
  73
  74 struct iwl_rate_scale_data {
  75         u64 data;
  76         s32 success_counter;
  77         s32 success_ratio;
  78         s32 counter;
  79         s32 average_tpt;
  80         unsigned long stamp;
  81 };
  82
  83 struct iwl_scale_tbl_info {
  84         enum iwl_table_type lq_type;
  85         enum iwl_antenna_type antenna_type;
  86         u8 is_SGI;
  87         u8 is_fat;
  88         u8 is_dup;
  89         u8 action;
  90         s32 *expected_tpt;
  91         struct iwl_rate current_rate;
  92         struct iwl_rate_scale_data win[IWL_RATE_COUNT];
  93 };
  94
  95 struct iwl_rate_scale_priv {
  96         u8 active_tbl;
  97         u8 enable_counter;
  98         u8 stay_in_tbl;
  99         u8 search_better_tbl;
 100         s32 last_tpt;
 101         u32 table_count_limit;
 102         u32 max_failure_limit;
 103         u32 max_success_limit;
 104         u32 table_count;
 105         u32 total_failed;
 106         u32 total_success;
 107         u32 flush_timer;
 108         u8 action_counter;
 109         u8 antenna;
 110         u8 valid_antenna;
 111         u8 is_green;
 112         u8 is_dup;
 113         u8 phymode;
 114         u8 ibss_sta_added;
 115         u32 supp_rates;
 116         u16 active_rate;
 117         u16 active_siso_rate;
 118         u16 active_mimo_rate;
 119         u16 active_rate_basic;
 120         struct iwl_link_quality_cmd lq;
 121         struct iwl_scale_tbl_info lq_info[LQ_SIZE];
 122 #ifdef CONFIG_MAC80211_DEBUGFS
 123         struct dentry *rs_sta_dbgfs_scale_table_file;
 124         struct dentry *rs_sta_dbgfs_stats_table_file;
 125         struct iwl_rate dbg_fixed;
 126         struct iwl_priv *drv;
 127 #endif
 128 };
 129
 130 static void rs_rate_scale_perform(struct iwl_priv *priv,
 131                                    struct net_device *dev,
 132                                    struct ieee80211_hdr *hdr,
 133                                    struct sta_info *sta);
 134 static void rs_fill_link_cmd(struct iwl_rate_scale_priv *lq_data,
 135                              struct iwl_rate *tx_mcs,
 136                              struct iwl_link_quality_cmd *tbl);
 137
 138
 139 #ifdef CONFIG_MAC80211_DEBUGFS
 140 static void rs_dbgfs_set_mcs(struct iwl_rate_scale_priv *rs_priv,
 141                                 struct iwl_rate *mcs, int index);
 142 #else
 143 static void rs_dbgfs_set_mcs(struct iwl_rate_scale_priv *rs_priv,
 144                                 struct iwl_rate *mcs, int index)
 145 {}
 146 #endif
 147 static s32 expected_tpt_A[IWL_RATE_COUNT] = {
 148         0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
 149 };
 150
 151 static s32 expected_tpt_G[IWL_RATE_COUNT] = {
 152         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
 153 };
 154
 155 static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
 156         0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
 157 };
 158
 159 static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
 160         0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
 161 };
 162
 163 static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
 164         0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
 165 };
 166
 167 static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
 168         0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
 169 };
 170
 171 static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
 172         0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
 173 };
 174
 175 static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
 176         0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
 177 };
 178
 179 static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
 180         0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
 181 };
 182
 183 static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
 184         0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
 185 };
 186
 187 static int iwl_lq_sync_callback(struct iwl_priv *priv,
 188                                 struct iwl_cmd *cmd, struct sk_buff *skb)
 189 {
 190         /*We didn't cache the SKB; let the caller free it */
 191         return 1;
 192 }
 193
 194 static inline u8 iwl_rate_get_rate(u32 rate_n_flags)
 195 {
 196         return (u8)(rate_n_flags & 0xFF);
 197 }
 198
 199 static int rs_send_lq_cmd(struct iwl_priv *priv,
 200                           struct iwl_link_quality_cmd *lq, u8 flags)
 201 {
 202 #ifdef CONFIG_IWLWIFI_DEBUG
 203         int i;
 204 #endif
 205         struct iwl_host_cmd cmd = {
 206                 .id = REPLY_TX_LINK_QUALITY_CMD,
 207                 .len = sizeof(struct iwl_link_quality_cmd),
 208                 .meta.flags = flags,
 209                 .data = lq,
 210         };
 211
 212         if ((lq->sta_id == 0xFF) &&
 213             (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
 214                 return -EINVAL;
 215
 216         if (lq->sta_id == 0xFF)
 217                 lq->sta_id = IWL_AP_ID;
 218
 219         IWL_DEBUG_RATE("lq station id 0x%x\n", lq->sta_id);
 220         IWL_DEBUG_RATE("lq dta 0x%X 0x%X\n",
 221                        lq->general_params.single_stream_ant_msk,
 222                        lq->general_params.dual_stream_ant_msk);
 223 #ifdef CONFIG_IWLWIFI_DEBUG
 224         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
 225                 IWL_DEBUG_RATE("lq index %d 0x%X\n",
 226                                 i, lq->rs_table[i].rate_n_flags);
 227 #endif
 228
 229         if (flags & CMD_ASYNC)
 230                 cmd.meta.u.callback = iwl_lq_sync_callback;
 231
 232         if (iwl_is_associated(priv) && priv->assoc_station_added &&
 233             priv->lq_mngr.lq_ready)
 234                 return  iwl_send_cmd(priv, &cmd);
 235
 236         return 0;
 237 }
 238
 239 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 240 {
 241         window->data = 0;
 242         window->success_counter = 0;
 243         window->success_ratio = IWL_INVALID_VALUE;
 244         window->counter = 0;
 245         window->average_tpt = IWL_INVALID_VALUE;
 246         window->stamp = 0;
 247 }
 248
 249 static int rs_collect_tx_data(struct iwl_rate_scale_data *windows,
 250                               int scale_index, s32 tpt, u32 status)
 251 {
 252         struct iwl_rate_scale_data *window = NULL;
 253         u64 mask;
 254         u8 win_size = IWL_RATE_MAX_WINDOW;
 255         s32 fail_count;
 256
 257         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 258                 return -EINVAL;
 259
 260         window = &(windows[scale_index]);
 261
 262         if (window->counter >= win_size) {
 263
 264                 window->counter = win_size - 1;
 265                 mask = 1;
 266                 mask = (mask << (win_size - 1));
 267                 if ((window->data & mask)) {
 268                         window->data &= ~mask;
 269                         window->success_counter = window->success_counter - 1;
 270                 }
 271         }
 272
 273         window->counter = window->counter + 1;
 274         mask = window->data;
 275         window->data = (mask << 1);
 276         if (status != 0) {
 277                 window->success_counter = window->success_counter + 1;
 278                 window->data |= 0x1;
 279         }
 280
 281         if (window->counter > 0)
 282                 window->success_ratio = 128 * (100 * window->success_counter)
 283                                         / window->counter;
 284         else
 285                 window->success_ratio = IWL_INVALID_VALUE;
 286
 287         fail_count = window->counter - window->success_counter;
 288
 289         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 290             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 291                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 292         else
 293                 window->average_tpt = IWL_INVALID_VALUE;
 294
 295         window->stamp = jiffies;
 296
 297         return 0;
 298 }
 299
 300 static void rs_mcs_from_tbl(struct iwl_rate *mcs_rate,
 301                            struct iwl_scale_tbl_info *tbl,
 302                            int index, u8 use_green)
 303 {
 304         if (is_legacy(tbl->lq_type)) {
 305                 mcs_rate->rate_n_flags = iwl_rates[index].plcp;
 306                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 307                         mcs_rate->rate_n_flags |= RATE_MCS_CCK_MSK;
 308
 309         } else if (is_siso(tbl->lq_type)) {
 310                 if (index > IWL_LAST_OFDM_RATE)
 311                         index = IWL_LAST_OFDM_RATE;
 312                  mcs_rate->rate_n_flags = iwl_rates[index].plcp_siso |
 313                                           RATE_MCS_HT_MSK;
 314         } else {
 315                 if (index > IWL_LAST_OFDM_RATE)
 316                         index = IWL_LAST_OFDM_RATE;
 317                 mcs_rate->rate_n_flags = iwl_rates[index].plcp_mimo |
 318                                          RATE_MCS_HT_MSK;
 319         }
 320
 321         switch (tbl->antenna_type) {
 322         case ANT_BOTH:
 323                 mcs_rate->rate_n_flags |= RATE_MCS_ANT_AB_MSK;
 324                 break;
 325         case ANT_MAIN:
 326                 mcs_rate->rate_n_flags |= RATE_MCS_ANT_A_MSK;
 327                 break;
 328         case ANT_AUX:
 329                 mcs_rate->rate_n_flags |= RATE_MCS_ANT_B_MSK;
 330                 break;
 331         case ANT_NONE:
 332                 break;
 333         }
 334
 335         if (is_legacy(tbl->lq_type))
 336                 return;
 337
 338         if (tbl->is_fat) {
 339                 if (tbl->is_dup)
 340                         mcs_rate->rate_n_flags |= RATE_MCS_DUP_MSK;
 341                 else
 342                         mcs_rate->rate_n_flags |= RATE_MCS_FAT_MSK;
 343         }
 344         if (tbl->is_SGI)
 345                 mcs_rate->rate_n_flags |= RATE_MCS_SGI_MSK;
 346
 347         if (use_green) {
 348                 mcs_rate->rate_n_flags |= RATE_MCS_GF_MSK;
 349                 if (is_siso(tbl->lq_type))
 350                         mcs_rate->rate_n_flags &= ~RATE_MCS_SGI_MSK;
 351         }
 352 }
 353
 354 static int rs_get_tbl_info_from_mcs(const struct iwl_rate *mcs_rate,
 355                                     int phymode, struct iwl_scale_tbl_info *tbl,
 356                                     int *rate_idx)
 357 {
 358         int index;
 359         u32 ant_msk;
 360
 361         index = iwl_rate_index_from_plcp(mcs_rate->rate_n_flags);
 362
 363         if (index  == IWL_RATE_INVALID) {
 364                 *rate_idx = -1;
 365                 return -EINVAL;
 366         }
 367         tbl->is_SGI = 0;
 368         tbl->is_fat = 0;
 369         tbl->is_dup = 0;
 370         tbl->antenna_type = ANT_BOTH;
 371
 372         if (!(mcs_rate->rate_n_flags & RATE_MCS_HT_MSK)) {
 373                 ant_msk = (mcs_rate->rate_n_flags & RATE_MCS_ANT_AB_MSK);
 374
 375                 if (ant_msk == RATE_MCS_ANT_AB_MSK)
 376                         tbl->lq_type = LQ_NONE;
 377                 else {
 378
 379                         if (phymode == MODE_IEEE80211A)
 380                                 tbl->lq_type = LQ_A;
 381                         else
 382                                 tbl->lq_type = LQ_G;
 383
 384                         if (mcs_rate->rate_n_flags & RATE_MCS_ANT_A_MSK)
 385                                 tbl->antenna_type = ANT_MAIN;
 386                         else
 387                                 tbl->antenna_type = ANT_AUX;
 388                 }
 389                 *rate_idx = index;
 390
 391         } else if (iwl_rate_get_rate(mcs_rate->rate_n_flags)
 392                                         <= IWL_RATE_SISO_60M_PLCP) {
 393                 tbl->lq_type = LQ_SISO;
 394
 395                 ant_msk = (mcs_rate->rate_n_flags & RATE_MCS_ANT_AB_MSK);
 396                 if (ant_msk == RATE_MCS_ANT_AB_MSK)
 397                         tbl->lq_type = LQ_NONE;
 398                 else {
 399                         if (mcs_rate->rate_n_flags & RATE_MCS_ANT_A_MSK)
 400                                 tbl->antenna_type = ANT_MAIN;
 401                         else
 402                                 tbl->antenna_type = ANT_AUX;
 403                 }
 404                 if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK)
 405                         tbl->is_SGI = 1;
 406
 407                 if ((mcs_rate->rate_n_flags & RATE_MCS_FAT_MSK) ||
 408                     (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK))
 409                         tbl->is_fat = 1;
 410
 411                 if (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK)
 412                         tbl->is_dup = 1;
 413
 414                 *rate_idx = index;
 415         } else {
 416                 tbl->lq_type = LQ_MIMO;
 417                 if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK)
 418                         tbl->is_SGI = 1;
 419
 420                 if ((mcs_rate->rate_n_flags & RATE_MCS_FAT_MSK) ||
 421                     (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK))
 422                         tbl->is_fat = 1;
 423
 424                 if (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK)
 425                         tbl->is_dup = 1;
 426                 *rate_idx = index;
 427         }
 428         return 0;
 429 }
 430
 431 static inline void rs_toggle_antenna(struct iwl_rate *new_rate,
 432                                      struct iwl_scale_tbl_info *tbl)
 433 {
 434         if (tbl->antenna_type == ANT_AUX) {
 435                 tbl->antenna_type = ANT_MAIN;
 436                 new_rate->rate_n_flags &= ~RATE_MCS_ANT_B_MSK;
 437                 new_rate->rate_n_flags |= RATE_MCS_ANT_A_MSK;
 438         } else {
 439                 tbl->antenna_type = ANT_AUX;
 440                 new_rate->rate_n_flags &= ~RATE_MCS_ANT_A_MSK;
 441                 new_rate->rate_n_flags |= RATE_MCS_ANT_B_MSK;
 442         }
 443 }
 444
 445 static inline u8 rs_use_green(struct iwl_priv *priv)
 446 {
 447 #ifdef CONFIG_IWLWIFI_HT
 448         if (!priv->is_ht_enabled || !priv->current_assoc_ht.is_ht)
 449                 return 0;
 450
 451         return ((priv->current_assoc_ht.is_green_field) &&
 452             !(priv->current_assoc_ht.operating_mode & 0x4));
 453 #endif  /*CONFIG_IWLWIFI_HT */
 454         return 0;
 455 }
 456
 457 /**
 458  * rs_get_supported_rates - get the available rates
 459  *
 460  * if management frame or broadcast frame only return
 461  * basic available rates.
 462  *
 463  */
 464 static void rs_get_supported_rates(struct iwl_rate_scale_priv *lq_data,
 465                                    struct ieee80211_hdr *hdr,
 466                                    enum iwl_table_type rate_type,
 467                                    u16 *data_rate)
 468 {
 469         if (is_legacy(rate_type))
 470                 *data_rate = lq_data->active_rate;
 471         else {
 472                 if (is_siso(rate_type))
 473                         *data_rate = lq_data->active_siso_rate;
 474                 else
 475                         *data_rate = lq_data->active_mimo_rate;
 476         }
 477
 478         if (hdr && is_multicast_ether_addr(hdr->addr1) &&
 479             lq_data->active_rate_basic)
 480                 *data_rate = lq_data->active_rate_basic;
 481 }
 482
 483 static u16 rs_get_adjacent_rate(u8 index, u16 rate_mask, int rate_type)
 484 {
 485         u8 high = IWL_RATE_INVALID;
 486         u8 low = IWL_RATE_INVALID;
 487
 488         /* 802.11A or ht walks to the next literal adjacent rate in
 489          * the rate table */
 490         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 491                 int i;
 492                 u32 mask;
 493
 494                 /* Find the previous rate that is in the rate mask */
 495                 i = index - 1;
 496                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 497                         if (rate_mask & mask) {
 498                                 low = i;
 499                                 break;
 500                         }
 501                 }
 502
 503                 /* Find the next rate that is in the rate mask */
 504                 i = index + 1;
 505                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 506                         if (rate_mask & mask) {
 507                                 high = i;
 508                                 break;
 509                         }
 510                 }
 511
 512                 return (high << 8) | low;
 513         }
 514
 515         low = index;
 516         while (low != IWL_RATE_INVALID) {
 517                 low = iwl_rates[low].prev_rs;
 518                 if (low == IWL_RATE_INVALID)
 519                         break;
 520                 if (rate_mask & (1 << low))
 521                         break;
 522                 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
 523         }
 524
 525         high = index;
 526         while (high != IWL_RATE_INVALID) {
 527                 high = iwl_rates[high].next_rs;
 528                 if (high == IWL_RATE_INVALID)
 529                         break;
 530                 if (rate_mask & (1 << high))
 531                         break;
 532                 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
 533         }
 534
 535         return (high << 8) | low;
 536 }
 537
 538 static void rs_get_lower_rate(struct iwl_rate_scale_priv *lq_data,
 539                              struct iwl_scale_tbl_info *tbl, u8 scale_index,
 540                              u8 ht_possible, struct iwl_rate *mcs_rate)
 541 {
 542         s32 low;
 543         u16 rate_mask;
 544         u16 high_low;
 545         u8 switch_to_legacy = 0;
 546         u8 is_green = lq_data->is_green;
 547
 548         /* check if we need to switch from HT to legacy rates.
 549          * assumption is that mandatory rates (1Mbps or 6Mbps)
 550          * are always supported (spec demand) */
 551         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
 552                 switch_to_legacy = 1;
 553                 scale_index = rs_ht_to_legacy[scale_index];
 554                 if (lq_data->phymode == MODE_IEEE80211A)
 555                         tbl->lq_type = LQ_A;
 556                 else
 557                         tbl->lq_type = LQ_G;
 558
 559                 if ((tbl->antenna_type == ANT_BOTH) ||
 560                     (tbl->antenna_type == ANT_NONE))
 561                         tbl->antenna_type = ANT_MAIN;
 562
 563                 tbl->is_fat = 0;
 564                 tbl->is_SGI = 0;
 565         }
 566
 567         rs_get_supported_rates(lq_data, NULL, tbl->lq_type, &rate_mask);
 568
 569         /* mask with station rate restriction */
 570         if (is_legacy(tbl->lq_type)) {
 571                 if (lq_data->phymode == (u8) MODE_IEEE80211A)
 572                         rate_mask  = (u16)(rate_mask &
 573                            (lq_data->supp_rates << IWL_FIRST_OFDM_RATE));
 574                 else
 575                         rate_mask = (u16)(rate_mask & lq_data->supp_rates);
 576         }
 577
 578         /* if we did switched from HT to legacy check current rate */
 579         if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
 580                 rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green);
 581                 return;
 582         }
 583
 584         high_low = rs_get_adjacent_rate(scale_index, rate_mask, tbl->lq_type);
 585         low = high_low & 0xff;
 586
 587         if (low != IWL_RATE_INVALID)
 588                 rs_mcs_from_tbl(mcs_rate, tbl, low, is_green);
 589         else
 590                 rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green);
 591 }
 592
 593 static void rs_tx_status(void *priv_rate,
 594                          struct net_device *dev,
 595                          struct sk_buff *skb,
 596                          struct ieee80211_tx_status *tx_resp)
 597 {
 598         int status;
 599         u8 retries;
 600         int rs_index, index = 0;
 601         struct iwl_rate_scale_priv *lq;
 602         struct iwl_link_quality_cmd *table;
 603         struct sta_info *sta;
 604         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 605         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
 606         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 607         struct iwl_rate_scale_data *window = NULL;
 608         struct iwl_rate_scale_data *search_win = NULL;
 609         struct iwl_rate tx_mcs;
 610         struct iwl_scale_tbl_info tbl_type;
 611         struct iwl_scale_tbl_info *curr_tbl, *search_tbl;
 612         u8 active_index = 0;
 613         u16 fc = le16_to_cpu(hdr->frame_control);
 614         s32 tpt = 0;
 615
 616         IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
 617
 618         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1))
 619                 return;
 620
 621         retries = tx_resp->retry_count;
 622
 623         if (retries > 15)
 624                 retries = 15;
 625
 626
 627         sta = sta_info_get(local, hdr->addr1);
 628
 629         if (!sta || !sta->rate_ctrl_priv) {
 630                 if (sta)
 631                         sta_info_put(sta);
 632                 return;
 633         }
 634
 635         lq = (struct iwl_rate_scale_priv *)sta->rate_ctrl_priv;
 636
 637         if (!priv->lq_mngr.lq_ready)
 638                 return;
 639
 640         if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) && !lq->ibss_sta_added)
 641                 return;
 642
 643         table = &lq->lq;
 644         active_index = lq->active_tbl;
 645
 646         lq->antenna = (lq->valid_antenna & local->hw.conf.antenna_sel_tx);
 647         if (!lq->antenna)
 648                 lq->antenna = lq->valid_antenna;
 649
 650         lq->antenna = lq->valid_antenna;
 651         curr_tbl = &(lq->lq_info[active_index]);
 652         search_tbl = &(lq->lq_info[(1 - active_index)]);
 653         window = (struct iwl_rate_scale_data *)
 654             &(curr_tbl->win[0]);
 655         search_win = (struct iwl_rate_scale_data *)
 656             &(search_tbl->win[0]);
 657
 658         tx_mcs.rate_n_flags = tx_resp->control.tx_rate;
 659
 660         rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode,
 661                                   &tbl_type, &rs_index);
 662         if ((rs_index < 0) || (rs_index >= IWL_RATE_COUNT)) {
 663                 IWL_DEBUG_RATE("bad rate index at: %d rate 0x%X\n",
 664                              rs_index, tx_mcs.rate_n_flags);
 665                 sta_info_put(sta);
 666                 return;
 667         }
 668
 669         if (retries &&
 670             (tx_mcs.rate_n_flags !=
 671                                 le32_to_cpu(table->rs_table[0].rate_n_flags))) {
 672                 IWL_DEBUG_RATE("initial rate does not match 0x%x 0x%x\n",
 673                                 tx_mcs.rate_n_flags,
 674                                 le32_to_cpu(table->rs_table[0].rate_n_flags));
 675                 sta_info_put(sta);
 676                 return;
 677         }
 678
 679         while (retries) {
 680                 tx_mcs.rate_n_flags =
 681                     le32_to_cpu(table->rs_table[index].rate_n_flags);
 682                 rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode,
 683                                           &tbl_type, &rs_index);
 684
 685                 if ((tbl_type.lq_type == search_tbl->lq_type) &&
 686                     (tbl_type.antenna_type == search_tbl->antenna_type) &&
 687                     (tbl_type.is_SGI == search_tbl->is_SGI)) {
 688                         if (search_tbl->expected_tpt)
 689                                 tpt = search_tbl->expected_tpt[rs_index];
 690                         else
 691                                 tpt = 0;
 692                         rs_collect_tx_data(search_win,
 693                                             rs_index, tpt, 0);
 694                 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
 695                            (tbl_type.antenna_type == curr_tbl->antenna_type) &&
 696                            (tbl_type.is_SGI == curr_tbl->is_SGI)) {
 697                         if (curr_tbl->expected_tpt)
 698                                 tpt = curr_tbl->expected_tpt[rs_index];
 699                         else
 700                                 tpt = 0;
 701                         rs_collect_tx_data(window, rs_index, tpt, 0);
 702                 }
 703                 if (lq->stay_in_tbl)
 704                         lq->total_failed++;
 705                 --retries;
 706                 index++;
 707
 708         }
 709
 710         if (!tx_resp->retry_count)
 711                 tx_mcs.rate_n_flags = tx_resp->control.tx_rate;
 712         else
 713                 tx_mcs.rate_n_flags =
 714                         le32_to_cpu(table->rs_table[index].rate_n_flags);
 715
 716         rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode,
 717                                   &tbl_type, &rs_index);
 718
 719         if (tx_resp->flags & IEEE80211_TX_STATUS_ACK)
 720                 status = 1;
 721         else
 722                 status = 0;
 723
 724         if ((tbl_type.lq_type == search_tbl->lq_type) &&
 725             (tbl_type.antenna_type == search_tbl->antenna_type) &&
 726             (tbl_type.is_SGI == search_tbl->is_SGI)) {
 727                 if (search_tbl->expected_tpt)
 728                         tpt = search_tbl->expected_tpt[rs_index];
 729                 else
 730                         tpt = 0;
 731                 rs_collect_tx_data(search_win,
 732                                     rs_index, tpt, status);
 733         } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
 734                    (tbl_type.antenna_type == curr_tbl->antenna_type) &&
 735                    (tbl_type.is_SGI == curr_tbl->is_SGI)) {
 736                 if (curr_tbl->expected_tpt)
 737                         tpt = curr_tbl->expected_tpt[rs_index];
 738                 else
 739                         tpt = 0;
 740                 rs_collect_tx_data(window, rs_index, tpt, status);
 741         }
 742
 743         if (lq->stay_in_tbl) {
 744                 if (status)
 745                         lq->total_success++;
 746                 else
 747                         lq->total_failed++;
 748         }
 749
 750         rs_rate_scale_perform(priv, dev, hdr, sta);
 751         sta_info_put(sta);
 752         return;
 753 }
 754
 755 static u8 rs_is_ant_connected(u8 valid_antenna,
 756                               enum iwl_antenna_type antenna_type)
 757 {
 758         if (antenna_type == ANT_AUX)
 759                 return ((valid_antenna & 0x2) ? 1:0);
 760         else if (antenna_type == ANT_MAIN)
 761                 return ((valid_antenna & 0x1) ? 1:0);
 762         else if (antenna_type == ANT_BOTH)
 763                 return ((valid_antenna & 0x3) == 0x3);
 764
 765         return 1;
 766 }
 767
 768 static u8 rs_is_other_ant_connected(u8 valid_antenna,
 769                                     enum iwl_antenna_type antenna_type)
 770 {
 771         if (antenna_type == ANT_AUX)
 772                 return rs_is_ant_connected(valid_antenna, ANT_MAIN);
 773         else
 774                 return rs_is_ant_connected(valid_antenna, ANT_AUX);
 775
 776         return 0;
 777 }
 778
 779 static void rs_set_stay_in_table(u8 is_legacy,
 780                                  struct iwl_rate_scale_priv *lq_data)
 781 {
 782         IWL_DEBUG_HT("we are staying in the same table\n");
 783         lq_data->stay_in_tbl = 1;
 784         if (is_legacy) {
 785                 lq_data->table_count_limit = IWL_LEGACY_TABLE_COUNT;
 786                 lq_data->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
 787                 lq_data->max_success_limit = IWL_LEGACY_TABLE_COUNT;
 788         } else {
 789                 lq_data->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
 790                 lq_data->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
 791                 lq_data->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
 792         }
 793         lq_data->table_count = 0;
 794         lq_data->total_failed = 0;
 795         lq_data->total_success = 0;
 796 }
 797
 798 static void rs_get_expected_tpt_table(struct iwl_rate_scale_priv *lq_data,
 799                                       struct iwl_scale_tbl_info *tbl)
 800 {
 801         if (is_legacy(tbl->lq_type)) {
 802                 if (!is_a_band(tbl->lq_type))
 803                         tbl->expected_tpt = expected_tpt_G;
 804                 else
 805                         tbl->expected_tpt = expected_tpt_A;
 806         } else if (is_siso(tbl->lq_type)) {
 807                 if (tbl->is_fat && !lq_data->is_dup)
 808                         if (tbl->is_SGI)
 809                                 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
 810                         else
 811                                 tbl->expected_tpt = expected_tpt_siso40MHz;
 812                 else if (tbl->is_SGI)
 813                         tbl->expected_tpt = expected_tpt_siso20MHzSGI;
 814                 else
 815                         tbl->expected_tpt = expected_tpt_siso20MHz;
 816
 817         } else if (is_mimo(tbl->lq_type)) {
 818                 if (tbl->is_fat && !lq_data->is_dup)
 819                         if (tbl->is_SGI)
 820                                 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
 821                         else
 822                                 tbl->expected_tpt = expected_tpt_mimo40MHz;
 823                 else if (tbl->is_SGI)
 824                         tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
 825                 else
 826                         tbl->expected_tpt = expected_tpt_mimo20MHz;
 827         } else
 828                 tbl->expected_tpt = expected_tpt_G;
 829 }
 830
 831 #ifdef CONFIG_IWLWIFI_HT
 832 static s32 rs_get_best_rate(struct iwl_priv *priv,
 833                             struct iwl_rate_scale_priv *lq_data,
 834                             struct iwl_scale_tbl_info *tbl,
 835                             u16 rate_mask, s8 index, s8 rate)
 836 {
 837         struct iwl_scale_tbl_info *active_tbl =
 838             &(lq_data->lq_info[lq_data->active_tbl]);
 839         s32 new_rate, high, low, start_hi;
 840         s32 active_sr = active_tbl->win[index].success_ratio;
 841         s32 *tpt_tbl = tbl->expected_tpt;
 842         s32 active_tpt = active_tbl->expected_tpt[index];
 843         u16 high_low;
 844
 845         new_rate = high = low = start_hi = IWL_RATE_INVALID;
 846
 847         for (; ;) {
 848                 high_low = rs_get_adjacent_rate(rate, rate_mask, tbl->lq_type);
 849
 850                 low = high_low & 0xff;
 851                 high = (high_low >> 8) & 0xff;
 852
 853                 if ((((100 * tpt_tbl[rate]) > lq_data->last_tpt) &&
 854                      ((active_sr > IWL_RATE_DECREASE_TH) &&
 855                       (active_sr <= IWL_RATE_HIGH_TH) &&
 856                       (tpt_tbl[rate] <= active_tpt))) ||
 857                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
 858                      (tpt_tbl[rate] > active_tpt))) {
 859
 860                         if (start_hi != IWL_RATE_INVALID) {
 861                                 new_rate = start_hi;
 862                                 break;
 863                         }
 864                         new_rate = rate;
 865                         if (low != IWL_RATE_INVALID)
 866                                 rate = low;
 867                         else
 868                                 break;
 869                 } else {
 870                         if (new_rate != IWL_RATE_INVALID)
 871                                 break;
 872                         else if (high != IWL_RATE_INVALID) {
 873                                 start_hi = high;
 874                                 rate = high;
 875                         } else {
 876                                 new_rate = rate;
 877                                 break;
 878                         }
 879                 }
 880         }
 881
 882         return new_rate;
 883 }
 884 #endif                          /* CONFIG_IWLWIFI_HT */
 885
 886 static inline u8 rs_is_both_ant_supp(u8 valid_antenna)
 887 {
 888         return (rs_is_ant_connected(valid_antenna, ANT_BOTH));
 889 }
 890
 891 static int rs_switch_to_mimo(struct iwl_priv *priv,
 892                              struct iwl_rate_scale_priv *lq_data,
 893                              struct iwl_scale_tbl_info *tbl, int index)
 894 {
 895 #ifdef CONFIG_IWLWIFI_HT
 896         u16 rate_mask;
 897         s32 rate;
 898         s8 is_green = lq_data->is_green;
 899
 900         if (!priv->is_ht_enabled || !priv->current_assoc_ht.is_ht)
 901                 return -1;
 902
 903         IWL_DEBUG_HT("LQ: try to switch to MIMO\n");
 904         tbl->lq_type = LQ_MIMO;
 905         rs_get_supported_rates(lq_data, NULL, tbl->lq_type,
 906                                 &rate_mask);
 907
 908         if (priv->current_assoc_ht.tx_mimo_ps_mode == IWL_MIMO_PS_STATIC)
 909                 return -1;
 910
 911         if (!rs_is_both_ant_supp(lq_data->antenna))
 912                 return -1;
 913
 914         tbl->is_dup = lq_data->is_dup;
 915         tbl->action = 0;
 916         if (priv->current_channel_width == IWL_CHANNEL_WIDTH_40MHZ)
 917                 tbl->is_fat = 1;
 918         else
 919                 tbl->is_fat = 0;
 920
 921         if (tbl->is_fat) {
 922                 if (priv->current_assoc_ht.sgf & HT_SHORT_GI_40MHZ_ONLY)
 923                         tbl->is_SGI = 1;
 924                 else
 925                         tbl->is_SGI = 0;
 926         } else if (priv->current_assoc_ht.sgf & HT_SHORT_GI_20MHZ_ONLY)
 927                 tbl->is_SGI = 1;
 928         else
 929                 tbl->is_SGI = 0;
 930
 931         rs_get_expected_tpt_table(lq_data, tbl);
 932
 933         rate = rs_get_best_rate(priv, lq_data, tbl, rate_mask, index, index);
 934
 935         IWL_DEBUG_HT("LQ: MIMO best rate %d mask %X\n", rate, rate_mask);
 936         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask))
 937                 return -1;
 938         rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green);
 939
 940         IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
 941                      tbl->current_rate.rate_n_flags, is_green);
 942
 943 #endif                          /*CONFIG_IWLWIFI_HT */
 944         return 0;
 945 }
 946
 947 static int rs_switch_to_siso(struct iwl_priv *priv,
 948                              struct iwl_rate_scale_priv *lq_data,
 949                              struct iwl_scale_tbl_info *tbl, int index)
 950 {
 951 #ifdef CONFIG_IWLWIFI_HT
 952         u16 rate_mask;
 953         u8 is_green = lq_data->is_green;
 954         s32 rate;
 955
 956         IWL_DEBUG_HT("LQ: try to switch to SISO\n");
 957         if (!priv->is_ht_enabled || !priv->current_assoc_ht.is_ht)
 958                 return -1;
 959
 960         tbl->is_dup = lq_data->is_dup;
 961         tbl->lq_type = LQ_SISO;
 962         tbl->action = 0;
 963         rs_get_supported_rates(lq_data, NULL, tbl->lq_type,
 964                                 &rate_mask);
 965
 966         if (priv->current_channel_width == IWL_CHANNEL_WIDTH_40MHZ)
 967                 tbl->is_fat = 1;
 968         else
 969                 tbl->is_fat = 0;
 970
 971         if (tbl->is_fat) {
 972                 if (priv->current_assoc_ht.sgf & HT_SHORT_GI_40MHZ_ONLY)
 973                         tbl->is_SGI = 1;
 974                 else
 975                         tbl->is_SGI = 0;
 976         } else if (priv->current_assoc_ht.sgf & HT_SHORT_GI_20MHZ_ONLY)
 977                 tbl->is_SGI = 1;
 978         else
 979                 tbl->is_SGI = 0;
 980
 981         if (is_green)
 982                 tbl->is_SGI = 0;
 983
 984         rs_get_expected_tpt_table(lq_data, tbl);
 985         rate = rs_get_best_rate(priv, lq_data, tbl, rate_mask, index, index);
 986
 987         IWL_DEBUG_HT("LQ: get best rate %d mask %X\n", rate, rate_mask);
 988         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
 989                 IWL_DEBUG_HT("can not switch with index %d rate mask %x\n",
 990                              rate, rate_mask);
 991                 return -1;
 992         }
 993         rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green);
 994         IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
 995                      tbl->current_rate.rate_n_flags, is_green);
 996
 997 #endif                          /*CONFIG_IWLWIFI_HT */
 998         return 0;
 999 }
1000
1001 static int rs_move_legacy_other(struct iwl_priv *priv,
1002                                 struct iwl_rate_scale_priv *lq_data,
1003                                 int index)
1004 {
1005         int ret = 0;
1006         struct iwl_scale_tbl_info *tbl =
1007             &(lq_data->lq_info[lq_data->active_tbl]);
1008         struct iwl_scale_tbl_info *search_tbl =
1009             &(lq_data->lq_info[(1 - lq_data->active_tbl)]);
1010         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1011         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1012                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1013         u8 start_action = tbl->action;
1014
1015         for (; ;) {
1016                 switch (tbl->action) {
1017                 case IWL_LEGACY_SWITCH_ANTENNA:
1018                         IWL_DEBUG_HT("LQ Legacy switch Antenna\n");
1019
1020                         search_tbl->lq_type = LQ_NONE;
1021                         lq_data->action_counter++;
1022                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1023                                 break;
1024                         if (!rs_is_other_ant_connected(lq_data->antenna,
1025                                                         tbl->antenna_type))
1026                                 break;
1027
1028                         memcpy(search_tbl, tbl, sz);
1029
1030                         rs_toggle_antenna(&(search_tbl->current_rate),
1031                                            search_tbl);
1032                         rs_get_expected_tpt_table(lq_data, search_tbl);
1033                         lq_data->search_better_tbl = 1;
1034                         goto out;
1035
1036                 case IWL_LEGACY_SWITCH_SISO:
1037                         IWL_DEBUG_HT("LQ: Legacy switch to SISO\n");
1038                         memcpy(search_tbl, tbl, sz);
1039                         search_tbl->lq_type = LQ_SISO;
1040                         search_tbl->is_SGI = 0;
1041                         search_tbl->is_fat = 0;
1042                         ret = rs_switch_to_siso(priv, lq_data, search_tbl,
1043                                                index);
1044                         if (!ret) {
1045                                 lq_data->search_better_tbl = 1;
1046                                 lq_data->action_counter = 0;
1047                                 goto out;
1048                         }
1049
1050                         break;
1051                 case IWL_LEGACY_SWITCH_MIMO:
1052                         IWL_DEBUG_HT("LQ: Legacy switch MIMO\n");
1053                         memcpy(search_tbl, tbl, sz);
1054                         search_tbl->lq_type = LQ_MIMO;
1055                         search_tbl->is_SGI = 0;
1056                         search_tbl->is_fat = 0;
1057                         search_tbl->antenna_type = ANT_BOTH;
1058                         ret = rs_switch_to_mimo(priv, lq_data, search_tbl,
1059                                                index);
1060                         if (!ret) {
1061                                 lq_data->search_better_tbl = 1;
1062                                 lq_data->action_counter = 0;
1063                                 goto out;
1064                         }
1065                         break;
1066                 }
1067                 tbl->action++;
1068                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO)
1069                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1070
1071                 if (tbl->action == start_action)
1072                         break;
1073
1074         }
1075         return 0;
1076
1077  out:
1078         tbl->action++;
1079         if (tbl->action > IWL_LEGACY_SWITCH_MIMO)
1080                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1081         return 0;
1082
1083 }
1084
1085 static int rs_move_siso_to_other(struct iwl_priv *priv,
1086                                  struct iwl_rate_scale_priv *lq_data,
1087                                  int index)
1088 {
1089         int ret;
1090         u8 is_green = lq_data->is_green;
1091         struct iwl_scale_tbl_info *tbl =
1092             &(lq_data->lq_info[lq_data->active_tbl]);
1093         struct iwl_scale_tbl_info *search_tbl =
1094             &(lq_data->lq_info[(1 - lq_data->active_tbl)]);
1095         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1096         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1097                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1098         u8 start_action = tbl->action;
1099
1100         for (;;) {
1101                 lq_data->action_counter++;
1102                 switch (tbl->action) {
1103                 case IWL_SISO_SWITCH_ANTENNA:
1104                         IWL_DEBUG_HT("LQ: SISO SWITCH ANTENNA SISO\n");
1105                         search_tbl->lq_type = LQ_NONE;
1106                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1107                                 break;
1108                         if (!rs_is_other_ant_connected(lq_data->antenna,
1109                                                        tbl->antenna_type))
1110                                 break;
1111
1112                         memcpy(search_tbl, tbl, sz);
1113                         search_tbl->action = IWL_SISO_SWITCH_MIMO;
1114                         rs_toggle_antenna(&(search_tbl->current_rate),
1115                                            search_tbl);
1116                         lq_data->search_better_tbl = 1;
1117
1118                         goto out;
1119
1120                 case IWL_SISO_SWITCH_MIMO:
1121                         IWL_DEBUG_HT("LQ: SISO SWITCH TO MIMO FROM SISO\n");
1122                         memcpy(search_tbl, tbl, sz);
1123                         search_tbl->lq_type = LQ_MIMO;
1124                         search_tbl->is_SGI = 0;
1125                         search_tbl->is_fat = 0;
1126                         search_tbl->antenna_type = ANT_BOTH;
1127                         ret = rs_switch_to_mimo(priv, lq_data, search_tbl,
1128                                                index);
1129                         if (!ret) {
1130                                 lq_data->search_better_tbl = 1;
1131                                 goto out;
1132                         }
1133                         break;
1134                 case IWL_SISO_SWITCH_GI:
1135                         IWL_DEBUG_HT("LQ: SISO SWITCH TO GI\n");
1136                         memcpy(search_tbl, tbl, sz);
1137                         search_tbl->action = 0;
1138                         if (search_tbl->is_SGI)
1139                                 search_tbl->is_SGI = 0;
1140                         else if (!is_green)
1141                                 search_tbl->is_SGI = 1;
1142                         else
1143                                 break;
1144                         lq_data->search_better_tbl = 1;
1145                         if ((tbl->lq_type == LQ_SISO) &&
1146                             (tbl->is_SGI)) {
1147                                 s32 tpt = lq_data->last_tpt / 100;
1148                                 if (((!tbl->is_fat) &&
1149                                      (tpt >= expected_tpt_siso20MHz[index])) ||
1150                                     ((tbl->is_fat) &&
1151                                      (tpt >= expected_tpt_siso40MHz[index])))
1152                                         lq_data->search_better_tbl = 0;
1153                         }
1154                         rs_get_expected_tpt_table(lq_data, search_tbl);
1155                         rs_mcs_from_tbl(&search_tbl->current_rate,
1156                                              search_tbl, index, is_green);
1157                         goto out;
1158                 }
1159                 tbl->action++;
1160                 if (tbl->action > IWL_SISO_SWITCH_GI)
1161                         tbl->action = IWL_SISO_SWITCH_ANTENNA;
1162
1163                 if (tbl->action == start_action)
1164                         break;
1165         }
1166         return 0;
1167
1168  out:
1169         tbl->action++;
1170         if (tbl->action > IWL_SISO_SWITCH_GI)
1171                 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1172         return 0;
1173 }
1174
1175 static int rs_move_mimo_to_other(struct iwl_priv *priv,
1176                                  struct iwl_rate_scale_priv *lq_data,
1177                                  int index)
1178 {
1179         int ret;
1180         s8 is_green = lq_data->is_green;
1181         struct iwl_scale_tbl_info *tbl =
1182             &(lq_data->lq_info[lq_data->active_tbl]);
1183         struct iwl_scale_tbl_info *search_tbl =
1184             &(lq_data->lq_info[(1 - lq_data->active_tbl)]);
1185         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1186                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1187         u8 start_action = tbl->action;
1188
1189         for (;;) {
1190                 lq_data->action_counter++;
1191                 switch (tbl->action) {
1192                 case IWL_MIMO_SWITCH_ANTENNA_A:
1193                 case IWL_MIMO_SWITCH_ANTENNA_B:
1194                         IWL_DEBUG_HT("LQ: MIMO SWITCH TO SISO\n");
1195                         memcpy(search_tbl, tbl, sz);
1196                         search_tbl->lq_type = LQ_SISO;
1197                         search_tbl->is_SGI = 0;
1198                         search_tbl->is_fat = 0;
1199                         if (tbl->action == IWL_MIMO_SWITCH_ANTENNA_A)
1200                                 search_tbl->antenna_type = ANT_MAIN;
1201                         else
1202                                 search_tbl->antenna_type = ANT_AUX;
1203
1204                         ret = rs_switch_to_siso(priv, lq_data, search_tbl,
1205                                                index);
1206                         if (!ret) {
1207                                 lq_data->search_better_tbl = 1;
1208                                 goto out;
1209                         }
1210                         break;
1211
1212                 case IWL_MIMO_SWITCH_GI:
1213                         IWL_DEBUG_HT("LQ: MIMO SWITCH TO GI\n");
1214                         memcpy(search_tbl, tbl, sz);
1215                         search_tbl->lq_type = LQ_MIMO;
1216                         search_tbl->antenna_type = ANT_BOTH;
1217                         search_tbl->action = 0;
1218                         if (search_tbl->is_SGI)
1219                                 search_tbl->is_SGI = 0;
1220                         else
1221                                 search_tbl->is_SGI = 1;
1222                         lq_data->search_better_tbl = 1;
1223                         if ((tbl->lq_type == LQ_MIMO) &&
1224                             (tbl->is_SGI)) {
1225                                 s32 tpt = lq_data->last_tpt / 100;
1226                                 if (((!tbl->is_fat) &&
1227                                      (tpt >= expected_tpt_mimo20MHz[index])) ||
1228                                     ((tbl->is_fat) &&
1229                                      (tpt >= expected_tpt_mimo40MHz[index])))
1230                                         lq_data->search_better_tbl = 0;
1231                         }
1232                         rs_get_expected_tpt_table(lq_data, search_tbl);
1233                         rs_mcs_from_tbl(&search_tbl->current_rate,
1234                                              search_tbl, index, is_green);
1235                         goto out;
1236
1237                 }
1238                 tbl->action++;
1239                 if (tbl->action > IWL_MIMO_SWITCH_GI)
1240                         tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1241
1242                 if (tbl->action == start_action)
1243                         break;
1244         }
1245
1246         return 0;
1247  out:
1248         tbl->action++;
1249         if (tbl->action > IWL_MIMO_SWITCH_GI)
1250                 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1251         return 0;
1252
1253 }
1254
1255 static void rs_stay_in_table(struct iwl_rate_scale_priv *lq_data)
1256 {
1257         struct iwl_scale_tbl_info *tbl;
1258         int i;
1259         int active_tbl;
1260         int flush_interval_passed = 0;
1261
1262         active_tbl = lq_data->active_tbl;
1263
1264         tbl = &(lq_data->lq_info[active_tbl]);
1265
1266         if (lq_data->stay_in_tbl) {
1267
1268                 if (lq_data->flush_timer)
1269                         flush_interval_passed =
1270                             time_after(jiffies,
1271                                        (unsigned long)(lq_data->flush_timer +
1272                                         IWL_RATE_SCALE_FLUSH_INTVL));
1273
1274                 flush_interval_passed = 0;
1275                 if ((lq_data->total_failed > lq_data->max_failure_limit) ||
1276                     (lq_data->total_success > lq_data->max_success_limit) ||
1277                     ((!lq_data->search_better_tbl) && (lq_data->flush_timer)
1278                      && (flush_interval_passed))) {
1279                         IWL_DEBUG_HT("LQ: stay is expired %d %d %d\n:",
1280                                      lq_data->total_failed,
1281                                      lq_data->total_success,
1282                                      flush_interval_passed);
1283                         lq_data->stay_in_tbl = 0;
1284                         lq_data->total_failed = 0;
1285                         lq_data->total_success = 0;
1286                         lq_data->flush_timer = 0;
1287                 } else if (lq_data->table_count > 0) {
1288                         lq_data->table_count++;
1289                         if (lq_data->table_count >=
1290                             lq_data->table_count_limit) {
1291                                 lq_data->table_count = 0;
1292
1293                                 IWL_DEBUG_HT("LQ: stay in table clear win\n");
1294                                 for (i = 0; i < IWL_RATE_COUNT; i++)
1295                                         rs_rate_scale_clear_window(
1296                                                 &(tbl->win[i]));
1297                         }
1298                 }
1299
1300                 if (!lq_data->stay_in_tbl) {
1301                         for (i = 0; i < IWL_RATE_COUNT; i++)
1302                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1303                 }
1304         }
1305 }
1306
1307 static void rs_rate_scale_perform(struct iwl_priv *priv,
1308                                   struct net_device *dev,
1309                                   struct ieee80211_hdr *hdr,
1310                                   struct sta_info *sta)
1311 {
1312         int low = IWL_RATE_INVALID;
1313         int high = IWL_RATE_INVALID;
1314         int index;
1315         int i;
1316         struct iwl_rate_scale_data *window = NULL;
1317         int current_tpt = IWL_INVALID_VALUE;
1318         int low_tpt = IWL_INVALID_VALUE;
1319         int high_tpt = IWL_INVALID_VALUE;
1320         u32 fail_count;
1321         s8 scale_action = 0;
1322         u16 fc, rate_mask;
1323         u8 update_lq = 0;
1324         struct iwl_rate_scale_priv *lq_data;
1325         struct iwl_scale_tbl_info *tbl, *tbl1;
1326         u16 rate_scale_index_msk = 0;
1327         struct iwl_rate mcs_rate;
1328         u8 is_green = 0;
1329         u8 active_tbl = 0;
1330         u8 done_search = 0;
1331         u16 high_low;
1332
1333         IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1334
1335         fc = le16_to_cpu(hdr->frame_control);
1336         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
1337                 /* Send management frames and broadcast/multicast data using
1338                  * lowest rate. */
1339                 /* TODO: this could probably be improved.. */
1340                 return;
1341         }
1342
1343         if (!sta || !sta->rate_ctrl_priv)
1344                 return;
1345
1346         if (!priv->lq_mngr.lq_ready) {
1347                 IWL_DEBUG_RATE("still rate scaling not ready\n");
1348                 return;
1349         }
1350         lq_data = (struct iwl_rate_scale_priv *)sta->rate_ctrl_priv;
1351
1352         if (!lq_data->search_better_tbl)
1353                 active_tbl = lq_data->active_tbl;
1354         else
1355                 active_tbl = 1 - lq_data->active_tbl;
1356
1357         tbl = &(lq_data->lq_info[active_tbl]);
1358         is_green = lq_data->is_green;
1359
1360         index = sta->last_txrate;
1361
1362         IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1363                        tbl->lq_type);
1364
1365         rs_get_supported_rates(lq_data, hdr, tbl->lq_type,
1366                                 &rate_mask);
1367
1368         IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1369
1370         /* mask with station rate restriction */
1371         if (is_legacy(tbl->lq_type)) {
1372                 if (lq_data->phymode == (u8) MODE_IEEE80211A)
1373                         rate_scale_index_msk = (u16) (rate_mask &
1374                                 (lq_data->supp_rates << IWL_FIRST_OFDM_RATE));
1375                 else
1376                         rate_scale_index_msk = (u16) (rate_mask &
1377                                                       lq_data->supp_rates);
1378
1379         } else
1380                 rate_scale_index_msk = rate_mask;
1381
1382         if (!rate_scale_index_msk)
1383                 rate_scale_index_msk = rate_mask;
1384
1385         if (index < 0 || !((1 << index) & rate_scale_index_msk)) {
1386                 index = IWL_INVALID_VALUE;
1387                 update_lq = 1;
1388
1389                 /* get the lowest available rate */
1390                 for (i = 0; i <= IWL_RATE_COUNT; i++) {
1391                         if ((1 << i) & rate_scale_index_msk)
1392                                 index = i;
1393                 }
1394
1395                 if (index == IWL_INVALID_VALUE) {
1396                         IWL_WARNING("Can not find a suitable rate\n");
1397                         return;
1398                 }
1399         }
1400
1401         if (!tbl->expected_tpt)
1402                 rs_get_expected_tpt_table(lq_data, tbl);
1403
1404         window = &(tbl->win[index]);
1405
1406         fail_count = window->counter - window->success_counter;
1407         if (((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1408              (window->success_counter < IWL_RATE_MIN_SUCCESS_TH))
1409             || (tbl->expected_tpt == NULL)) {
1410                 IWL_DEBUG_RATE("LQ: still below TH succ %d total %d "
1411                                "for index %d\n",
1412                                window->success_counter, window->counter, index);
1413                 window->average_tpt = IWL_INVALID_VALUE;
1414                 rs_stay_in_table(lq_data);
1415                 if (update_lq) {
1416                         rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green);
1417                         rs_fill_link_cmd(lq_data, &mcs_rate, &lq_data->lq);
1418                         rs_send_lq_cmd(priv, &lq_data->lq, CMD_ASYNC);
1419                 }
1420                 goto out;
1421
1422         } else
1423                 window->average_tpt = ((window->success_ratio *
1424                                         tbl->expected_tpt[index] + 64) / 128);
1425
1426         if (lq_data->search_better_tbl) {
1427                 int success_limit = IWL_RATE_SCALE_SWITCH;
1428
1429                 if ((window->success_ratio > success_limit) ||
1430                     (window->average_tpt > lq_data->last_tpt)) {
1431                         if (!is_legacy(tbl->lq_type)) {
1432                                 IWL_DEBUG_HT("LQ: we are switching to HT"
1433                                              " rate suc %d current tpt %d"
1434                                              " old tpt %d\n",
1435                                              window->success_ratio,
1436                                              window->average_tpt,
1437                                              lq_data->last_tpt);
1438                                 lq_data->enable_counter = 1;
1439                         }
1440                         lq_data->active_tbl = active_tbl;
1441                         current_tpt = window->average_tpt;
1442                 } else {
1443                         tbl->lq_type = LQ_NONE;
1444                         active_tbl = lq_data->active_tbl;
1445                         tbl = &(lq_data->lq_info[active_tbl]);
1446
1447                         index = iwl_rate_index_from_plcp(
1448                                 tbl->current_rate.rate_n_flags);
1449
1450                         update_lq = 1;
1451                         current_tpt = lq_data->last_tpt;
1452                         IWL_DEBUG_HT("XXY GO BACK TO OLD TABLE\n");
1453                 }
1454                 lq_data->search_better_tbl = 0;
1455                 done_search = 1;
1456                 goto lq_update;
1457         }
1458
1459         high_low = rs_get_adjacent_rate(index, rate_scale_index_msk,
1460                                         tbl->lq_type);
1461         low = high_low & 0xff;
1462         high = (high_low >> 8) & 0xff;
1463
1464         current_tpt = window->average_tpt;
1465
1466         if (low != IWL_RATE_INVALID)
1467                 low_tpt = tbl->win[low].average_tpt;
1468
1469         if (high != IWL_RATE_INVALID)
1470                 high_tpt = tbl->win[high].average_tpt;
1471
1472
1473         scale_action = 1;
1474
1475         if ((window->success_ratio <= IWL_RATE_DECREASE_TH) ||
1476             (current_tpt == 0)) {
1477                 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1478                 scale_action = -1;
1479         } else if ((low_tpt == IWL_INVALID_VALUE) &&
1480                    (high_tpt == IWL_INVALID_VALUE))
1481                 scale_action = 1;
1482         else if ((low_tpt != IWL_INVALID_VALUE) &&
1483                  (high_tpt != IWL_INVALID_VALUE) &&
1484                  (low_tpt < current_tpt) &&
1485                  (high_tpt < current_tpt))
1486                 scale_action = 0;
1487         else {
1488                 if (high_tpt != IWL_INVALID_VALUE) {
1489                         if (high_tpt > current_tpt)
1490                                 scale_action = 1;
1491                         else {
1492                                 IWL_DEBUG_RATE
1493                                     ("decrease rate because of high tpt\n");
1494                                 scale_action = -1;
1495                         }
1496                 } else if (low_tpt != IWL_INVALID_VALUE) {
1497                         if (low_tpt > current_tpt) {
1498                                 IWL_DEBUG_RATE
1499                                     ("decrease rate because of low tpt\n");
1500                                 scale_action = -1;
1501                         } else
1502                                 scale_action = 1;
1503                 }
1504         }
1505
1506         if (scale_action == -1) {
1507                 if ((low != IWL_RATE_INVALID) &&
1508                     ((window->success_ratio > IWL_RATE_HIGH_TH) ||
1509                      (current_tpt > (100 * tbl->expected_tpt[low]))))
1510                         scale_action = 0;
1511         } else if ((scale_action == 1) &&
1512                    (window->success_ratio < IWL_RATE_INCREASE_TH))
1513                 scale_action = 0;
1514
1515         switch (scale_action) {
1516         case -1:
1517                 if (low != IWL_RATE_INVALID) {
1518                         update_lq = 1;
1519                         index = low;
1520                 }
1521                 break;
1522         case 1:
1523                 if (high != IWL_RATE_INVALID) {
1524                         update_lq = 1;
1525                         index = high;
1526                 }
1527
1528                 break;
1529         case 0:
1530         default:
1531                 break;
1532         }
1533
1534         IWL_DEBUG_HT("choose rate scale index %d action %d low %d "
1535                     "high %d type %d\n",
1536                      index, scale_action, low, high, tbl->lq_type);
1537
1538  lq_update:
1539         if (update_lq) {
1540                 rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green);
1541                 rs_fill_link_cmd(lq_data, &mcs_rate, &lq_data->lq);
1542                 rs_send_lq_cmd(priv, &lq_data->lq, CMD_ASYNC);
1543         }
1544         rs_stay_in_table(lq_data);
1545
1546         if (!update_lq && !done_search && !lq_data->stay_in_tbl) {
1547                 lq_data->last_tpt = current_tpt;
1548
1549                 if (is_legacy(tbl->lq_type))
1550                         rs_move_legacy_other(priv, lq_data, index);
1551                 else if (is_siso(tbl->lq_type))
1552                         rs_move_siso_to_other(priv, lq_data, index);
1553                 else
1554                         rs_move_mimo_to_other(priv, lq_data, index);
1555
1556                 if (lq_data->search_better_tbl) {
1557                         tbl = &(lq_data->lq_info[(1 - lq_data->active_tbl)]);
1558                         for (i = 0; i < IWL_RATE_COUNT; i++)
1559                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1560
1561                         index = iwl_rate_index_from_plcp(
1562                                         tbl->current_rate.rate_n_flags);
1563
1564                         IWL_DEBUG_HT("Switch current  mcs: %X index: %d\n",
1565                                      tbl->current_rate.rate_n_flags, index);
1566                         rs_fill_link_cmd(lq_data, &tbl->current_rate,
1567                                          &lq_data->lq);
1568                         rs_send_lq_cmd(priv, &lq_data->lq, CMD_ASYNC);
1569                 }
1570                 tbl1 = &(lq_data->lq_info[lq_data->active_tbl]);
1571
1572                 if (is_legacy(tbl1->lq_type) &&
1573 #ifdef CONFIG_IWLWIFI_HT
1574                     !priv->current_assoc_ht.is_ht &&
1575 #endif
1576                     (lq_data->action_counter >= 1)) {
1577                         lq_data->action_counter = 0;
1578                         IWL_DEBUG_HT("LQ: STAY in legacy table\n");
1579                         rs_set_stay_in_table(1, lq_data);
1580                 }
1581
1582                 if (lq_data->enable_counter &&
1583                     (lq_data->action_counter >= IWL_ACTION_LIMIT)) {
1584 #ifdef CONFIG_IWLWIFI_HT_AGG
1585                         if ((lq_data->last_tpt > TID_AGG_TPT_THREHOLD) &&
1586                             (priv->lq_mngr.agg_ctrl.auto_agg)) {
1587                                 priv->lq_mngr.agg_ctrl.tid_retry =
1588                                     TID_ALL_SPECIFIED;
1589                                 schedule_work(&priv->agg_work);
1590                         }
1591 #endif /*CONFIG_IWLWIFI_HT_AGG */
1592                         lq_data->action_counter = 0;
1593                         rs_set_stay_in_table(0, lq_data);
1594                 }
1595         } else {
1596                 if ((!update_lq) && (!done_search) && (!lq_data->flush_timer))
1597                         lq_data->flush_timer = jiffies;
1598         }
1599
1600 out:
1601         rs_mcs_from_tbl(&tbl->current_rate, tbl, index, is_green);
1602         i = index;
1603         sta->last_txrate = i;
1604
1605         /* sta->txrate is an index to A mode rates which start
1606          * at IWL_FIRST_OFDM_RATE
1607          */
1608         if (lq_data->phymode == (u8) MODE_IEEE80211A)
1609                 sta->txrate = i - IWL_FIRST_OFDM_RATE;
1610         else
1611                 sta->txrate = i;
1612
1613         return;
1614 }
1615
1616
1617 static void rs_initialize_lq(struct iwl_priv *priv,
1618                              struct sta_info *sta)
1619 {
1620         int i;
1621         struct iwl_rate_scale_priv *lq;
1622         struct iwl_scale_tbl_info *tbl;
1623         u8 active_tbl = 0;
1624         int rate_idx;
1625         u8 use_green = rs_use_green(priv);
1626         struct iwl_rate mcs_rate;
1627
1628         if (!sta || !sta->rate_ctrl_priv)
1629                 goto out;
1630
1631         lq = (struct iwl_rate_scale_priv *)sta->rate_ctrl_priv;
1632         i = sta->last_txrate;
1633
1634         if ((lq->lq.sta_id == 0xff) &&
1635             (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
1636                 goto out;
1637
1638         if (!lq->search_better_tbl)
1639                 active_tbl = lq->active_tbl;
1640         else
1641                 active_tbl = 1 - lq->active_tbl;
1642
1643         tbl = &(lq->lq_info[active_tbl]);
1644
1645         if ((i < 0) || (i >= IWL_RATE_COUNT))
1646                 i = 0;
1647
1648         mcs_rate.rate_n_flags = iwl_rates[i].plcp ;
1649         mcs_rate.rate_n_flags |= RATE_MCS_ANT_B_MSK;
1650         mcs_rate.rate_n_flags &= ~RATE_MCS_ANT_A_MSK;
1651
1652         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
1653                 mcs_rate.rate_n_flags |= RATE_MCS_CCK_MSK;
1654
1655         tbl->antenna_type = ANT_AUX;
1656         rs_get_tbl_info_from_mcs(&mcs_rate, priv->phymode, tbl, &rate_idx);
1657         if (!rs_is_ant_connected(priv->valid_antenna, tbl->antenna_type))
1658             rs_toggle_antenna(&mcs_rate, tbl);
1659
1660         rs_mcs_from_tbl(&mcs_rate, tbl, rate_idx, use_green);
1661         tbl->current_rate.rate_n_flags = mcs_rate.rate_n_flags;
1662         rs_get_expected_tpt_table(lq, tbl);
1663         rs_fill_link_cmd(lq, &mcs_rate, &lq->lq);
1664         rs_send_lq_cmd(priv, &lq->lq, CMD_ASYNC);
1665  out:
1666         return;
1667 }
1668
1669 static void rs_get_rate(void *priv_rate, struct net_device *dev,
1670                         struct ieee80211_hw_mode *mode, struct sk_buff *skb,
1671                         struct rate_selection *sel)
1672 {
1673
1674         int i;
1675         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1676         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1677         struct sta_info *sta;
1678         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
1679         struct iwl_rate_scale_priv *lq;
1680
1681         IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
1682
1683         sta = sta_info_get(local, hdr->addr1);
1684
1685         if (!sta || !sta->rate_ctrl_priv) {
1686                 sel->rate = rate_lowest(local, local->oper_hw_mode, sta);
1687                 if (sta)
1688                         sta_info_put(sta);
1689                 return;
1690         }
1691
1692         lq = (struct iwl_rate_scale_priv *)sta->rate_ctrl_priv;
1693         i = sta->last_txrate;
1694
1695         if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) && !lq->ibss_sta_added) {
1696                 u8 sta_id = iwl_hw_find_station(priv, hdr->addr1);
1697                 DECLARE_MAC_BUF(mac);
1698
1699                 if (sta_id == IWL_INVALID_STATION) {
1700                         IWL_DEBUG_RATE("LQ: ADD station %s\n",
1701                                        print_mac(mac, hdr->addr1));
1702                         sta_id = iwl_add_station(priv,
1703                                                  hdr->addr1, 0, CMD_ASYNC);
1704                 }
1705                 if ((sta_id != IWL_INVALID_STATION)) {
1706                         lq->lq.sta_id = sta_id;
1707                         lq->lq.rs_table[0].rate_n_flags = 0;
1708                         lq->ibss_sta_added = 1;
1709                         rs_initialize_lq(priv, sta);
1710                 }
1711                 if (!lq->ibss_sta_added)
1712                         goto done;
1713         }
1714
1715  done:
1716         if ((i < 0) || (i > IWL_RATE_COUNT)) {
1717                 sel->rate = rate_lowest(local, local->oper_hw_mode, sta);
1718                 return;
1719         }
1720         sta_info_put(sta);
1721
1722         sel->rate = &priv->ieee_rates[i];
1723 }
1724
1725 static void *rs_alloc_sta(void *priv, gfp_t gfp)
1726 {
1727         struct iwl_rate_scale_priv *crl;
1728         int i, j;
1729
1730         IWL_DEBUG_RATE("create station rate scale window\n");
1731
1732         crl = kzalloc(sizeof(struct iwl_rate_scale_priv), gfp);
1733
1734         if (crl == NULL)
1735                 return NULL;
1736         crl->lq.sta_id = 0xff;
1737
1738
1739         for (j = 0; j < LQ_SIZE; j++)
1740                 for (i = 0; i < IWL_RATE_COUNT; i++)
1741                         rs_rate_scale_clear_window(&(crl->lq_info[j].win[i]));
1742
1743         return crl;
1744 }
1745
1746 static void rs_rate_init(void *priv_rate, void *priv_sta,
1747                          struct ieee80211_local *local,
1748                          struct sta_info *sta)
1749 {
1750         int i, j;
1751         struct ieee80211_hw_mode *mode = local->oper_hw_mode;
1752         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
1753         struct iwl_rate_scale_priv *crl = priv_sta;
1754
1755         crl->flush_timer = 0;
1756         crl->supp_rates = sta->supp_rates;
1757         sta->txrate = 3;
1758         for (j = 0; j < LQ_SIZE; j++)
1759                 for (i = 0; i < IWL_RATE_COUNT; i++)
1760                         rs_rate_scale_clear_window(&(crl->lq_info[j].win[i]));
1761
1762         IWL_DEBUG_RATE("rate scale global init\n");
1763         /* TODO: what is a good starting rate for STA? About middle? Maybe not
1764          * the lowest or the highest rate.. Could consider using RSSI from
1765          * previous packets? Need to have IEEE 802.1X auth succeed immediately
1766          * after assoc.. */
1767
1768         crl->ibss_sta_added = 0;
1769         if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
1770                 u8 sta_id = iwl_hw_find_station(priv, sta->addr);
1771                 DECLARE_MAC_BUF(mac);
1772
1773                 /* for IBSS the call are from tasklet */
1774                 IWL_DEBUG_HT("LQ: ADD station %s\n",
1775                              print_mac(mac, sta->addr));
1776
1777                 if (sta_id == IWL_INVALID_STATION) {
1778                         IWL_DEBUG_RATE("LQ: ADD station %s\n",
1779                                        print_mac(mac, sta->addr));
1780                         sta_id = iwl_add_station(priv,
1781                                                  sta->addr, 0, CMD_ASYNC);
1782                 }
1783                 if ((sta_id != IWL_INVALID_STATION)) {
1784                         crl->lq.sta_id = sta_id;
1785                         crl->lq.rs_table[0].rate_n_flags = 0;
1786                 }
1787                 /* FIXME: this is w/a remove it later */
1788                 priv->assoc_station_added = 1;
1789         }
1790
1791         for (i = 0; i < mode->num_rates; i++) {
1792                 if ((sta->supp_rates & BIT(i)) &&
1793                     (mode->rates[i].flags & IEEE80211_RATE_SUPPORTED))
1794                         sta->txrate = i;
1795         }
1796         sta->last_txrate = sta->txrate;
1797         /* For MODE_IEEE80211A mode cck rate are at end
1798          * rate table
1799          */
1800         if (local->hw.conf.phymode == MODE_IEEE80211A)
1801                 sta->last_txrate += IWL_FIRST_OFDM_RATE;
1802
1803         crl->is_dup = priv->is_dup;
1804         crl->valid_antenna = priv->valid_antenna;
1805         crl->antenna = priv->antenna;
1806         crl->is_green = rs_use_green(priv);
1807         crl->active_rate = priv->active_rate;
1808         crl->active_rate &= ~(0x1000);
1809         crl->active_rate_basic = priv->active_rate_basic;
1810         crl->phymode = priv->phymode;
1811 #ifdef CONFIG_IWLWIFI_HT
1812         crl->active_siso_rate = (priv->current_assoc_ht.supp_rates[0] << 1);
1813         crl->active_siso_rate |= (priv->current_assoc_ht.supp_rates[0] & 0x1);
1814         crl->active_siso_rate &= ~((u16)0x2);
1815         crl->active_siso_rate = crl->active_siso_rate << IWL_FIRST_OFDM_RATE;
1816
1817         crl->active_mimo_rate = (priv->current_assoc_ht.supp_rates[1] << 1);
1818         crl->active_mimo_rate |= (priv->current_assoc_ht.supp_rates[1] & 0x1);
1819         crl->active_mimo_rate &= ~((u16)0x2);
1820         crl->active_mimo_rate = crl->active_mimo_rate << IWL_FIRST_OFDM_RATE;
1821         IWL_DEBUG_HT("MIMO RATE 0x%X SISO MASK 0x%X\n", crl->active_siso_rate,
1822                      crl->active_mimo_rate);
1823 #endif /*CONFIG_IWLWIFI_HT*/
1824 #ifdef CONFIG_MAC80211_DEBUGFS
1825         crl->drv = priv;
1826 #endif
1827
1828         if (priv->assoc_station_added)
1829                 priv->lq_mngr.lq_ready = 1;
1830
1831         rs_initialize_lq(priv, sta);
1832 }
1833
1834 static void rs_fill_link_cmd(struct iwl_rate_scale_priv *lq_data,
1835                             struct iwl_rate *tx_mcs,
1836                             struct iwl_link_quality_cmd *lq_cmd)
1837 {
1838         int index = 0;
1839         int rate_idx;
1840         int repeat_rate = 0;
1841         u8 ant_toggle_count = 0;
1842         u8 use_ht_possible = 1;
1843         struct iwl_rate new_rate;
1844         struct iwl_scale_tbl_info tbl_type = { 0 };
1845
1846         rs_dbgfs_set_mcs(lq_data, tx_mcs, index);
1847
1848         rs_get_tbl_info_from_mcs(tx_mcs, lq_data->phymode,
1849                                   &tbl_type, &rate_idx);
1850
1851         if (is_legacy(tbl_type.lq_type)) {
1852                 ant_toggle_count = 1;
1853                 repeat_rate = IWL_NUMBER_TRY;
1854         } else
1855                 repeat_rate = IWL_HT_NUMBER_TRY;
1856
1857         lq_cmd->general_params.mimo_delimiter =
1858                         is_mimo(tbl_type.lq_type) ? 1 : 0;
1859         lq_cmd->rs_table[index].rate_n_flags =
1860                         cpu_to_le32(tx_mcs->rate_n_flags);
1861         new_rate.rate_n_flags = tx_mcs->rate_n_flags;
1862
1863         if (is_mimo(tbl_type.lq_type) || (tbl_type.antenna_type == ANT_MAIN))
1864                 lq_cmd->general_params.single_stream_ant_msk = 1;
1865         else
1866                 lq_cmd->general_params.single_stream_ant_msk = 2;
1867
1868         index++;
1869         repeat_rate--;
1870
1871         while (index < LINK_QUAL_MAX_RETRY_NUM) {
1872                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
1873                         if (is_legacy(tbl_type.lq_type)) {
1874                                 if (ant_toggle_count <
1875                                     NUM_TRY_BEFORE_ANTENNA_TOGGLE)
1876                                         ant_toggle_count++;
1877                                 else {
1878                                         rs_toggle_antenna(&new_rate, &tbl_type);
1879                                         ant_toggle_count = 1;
1880                                 }
1881                         }
1882
1883                         rs_dbgfs_set_mcs(lq_data, &new_rate, index);
1884                         lq_cmd->rs_table[index].rate_n_flags =
1885                                         cpu_to_le32(new_rate.rate_n_flags);
1886                         repeat_rate--;
1887                         index++;
1888                 }
1889
1890                 rs_get_tbl_info_from_mcs(&new_rate, lq_data->phymode, &tbl_type,
1891                                                 &rate_idx);
1892
1893                 if (is_mimo(tbl_type.lq_type))
1894                         lq_cmd->general_params.mimo_delimiter = index;
1895
1896                 rs_get_lower_rate(lq_data, &tbl_type, rate_idx,
1897                                   use_ht_possible, &new_rate);
1898
1899                 if (is_legacy(tbl_type.lq_type)) {
1900                         if (ant_toggle_count < NUM_TRY_BEFORE_ANTENNA_TOGGLE)
1901                                 ant_toggle_count++;
1902                         else {
1903                                 rs_toggle_antenna(&new_rate, &tbl_type);
1904                                 ant_toggle_count = 1;
1905                         }
1906                         repeat_rate = IWL_NUMBER_TRY;
1907                 } else
1908                         repeat_rate = IWL_HT_NUMBER_TRY;
1909
1910                 use_ht_possible = 0;
1911
1912                 rs_dbgfs_set_mcs(lq_data, &new_rate, index);
1913                 lq_cmd->rs_table[index].rate_n_flags =
1914                                 cpu_to_le32(new_rate.rate_n_flags);
1915
1916                 index++;
1917                 repeat_rate--;
1918         }
1919
1920         lq_cmd->general_params.dual_stream_ant_msk = 3;
1921         lq_cmd->agg_params.agg_dis_start_th = 3;
1922         lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
1923 }
1924
1925 static void *rs_alloc(struct ieee80211_local *local)
1926 {
1927         return local->hw.priv;
1928 }
1929 /* rate scale requires free function to be implemented */
1930 static void rs_free(void *priv_rate)
1931 {
1932         return;
1933 }
1934
1935 static void rs_clear(void *priv_rate)
1936 {
1937         struct iwl_priv *priv = (struct iwl_priv *) priv_rate;
1938
1939         IWL_DEBUG_RATE("enter\n");
1940
1941         priv->lq_mngr.lq_ready = 0;
1942 #ifdef CONFIG_IWLWIFI_HT
1943 #ifdef CONFIG_IWLWIFI_HT_AGG
1944         if (priv->lq_mngr.agg_ctrl.granted_ba)
1945                 iwl4965_turn_off_agg(priv, TID_ALL_SPECIFIED);
1946 #endif /*CONFIG_IWLWIFI_HT_AGG */
1947 #endif /* CONFIG_IWLWIFI_HT */
1948
1949         IWL_DEBUG_RATE("leave\n");
1950 }
1951
1952 static void rs_free_sta(void *priv, void *priv_sta)
1953 {
1954         struct iwl_rate_scale_priv *rs_priv = priv_sta;
1955
1956         IWL_DEBUG_RATE("enter\n");
1957         kfree(rs_priv);
1958         IWL_DEBUG_RATE("leave\n");
1959 }
1960
1961
1962 #ifdef CONFIG_MAC80211_DEBUGFS
1963 static int open_file_generic(struct inode *inode, struct file *file)
1964 {
1965         file->private_data = inode->i_private;
1966         return 0;
1967 }
1968 static void rs_dbgfs_set_mcs(struct iwl_rate_scale_priv *rs_priv,
1969                                 struct iwl_rate *mcs, int index)
1970 {
1971         u32 base_rate;
1972
1973         if (rs_priv->phymode == (u8) MODE_IEEE80211A)
1974                 base_rate = 0x800D;
1975         else
1976                 base_rate = 0x820A;
1977
1978         if (rs_priv->dbg_fixed.rate_n_flags) {
1979                 if (index < 12)
1980                         mcs->rate_n_flags = rs_priv->dbg_fixed.rate_n_flags;
1981                 else
1982                         mcs->rate_n_flags = base_rate;
1983                 IWL_DEBUG_RATE("Fixed rate ON\n");
1984                 return;
1985         }
1986
1987         IWL_DEBUG_RATE("Fixed rate OFF\n");
1988 }
1989
1990 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
1991                         const char __user *user_buf, size_t count, loff_t *ppos)
1992 {
1993         struct iwl_rate_scale_priv *rs_priv = file->private_data;
1994         char buf[64];
1995         int buf_size;
1996         u32 parsed_rate;
1997
1998         memset(buf, 0, sizeof(buf));
1999         buf_size = min(count, sizeof(buf) -  1);
2000         if (copy_from_user(buf, user_buf, buf_size))
2001                 return -EFAULT;
2002
2003         if (sscanf(buf, "%x", &parsed_rate) == 1)
2004                 rs_priv->dbg_fixed.rate_n_flags = parsed_rate;
2005         else
2006                 rs_priv->dbg_fixed.rate_n_flags = 0;
2007
2008         rs_priv->active_rate = 0x0FFF;
2009         rs_priv->active_siso_rate = 0x1FD0;
2010         rs_priv->active_mimo_rate = 0x1FD0;
2011
2012         IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2013                 rs_priv->lq.sta_id, rs_priv->dbg_fixed.rate_n_flags);
2014
2015         if (rs_priv->dbg_fixed.rate_n_flags) {
2016                 rs_fill_link_cmd(rs_priv, &rs_priv->dbg_fixed, &rs_priv->lq);
2017                 rs_send_lq_cmd(rs_priv->drv, &rs_priv->lq, CMD_ASYNC);
2018         }
2019
2020         return count;
2021 }
2022
2023 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2024                         char __user *user_buf, size_t count, loff_t *ppos)
2025 {
2026         char buff[1024];
2027         int desc = 0;
2028         int i = 0;
2029
2030         struct iwl_rate_scale_priv *rs_priv = file->private_data;
2031
2032         desc += sprintf(buff+desc, "sta_id %d\n", rs_priv->lq.sta_id);
2033         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2034                         rs_priv->total_failed, rs_priv->total_success,
2035                         rs_priv->active_rate);
2036         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2037                         rs_priv->dbg_fixed.rate_n_flags);
2038         desc += sprintf(buff+desc, "general:"
2039                 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2040                 rs_priv->lq.general_params.flags,
2041                 rs_priv->lq.general_params.mimo_delimiter,
2042                 rs_priv->lq.general_params.single_stream_ant_msk,
2043                 rs_priv->lq.general_params.dual_stream_ant_msk);
2044
2045         desc += sprintf(buff+desc, "agg:"
2046                         "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2047                         le16_to_cpu(rs_priv->lq.agg_params.agg_time_limit),
2048                         rs_priv->lq.agg_params.agg_dis_start_th,
2049                         rs_priv->lq.agg_params.agg_frame_cnt_limit);
2050
2051         desc += sprintf(buff+desc,
2052                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2053                         rs_priv->lq.general_params.start_rate_index[0],
2054                         rs_priv->lq.general_params.start_rate_index[1],
2055                         rs_priv->lq.general_params.start_rate_index[2],
2056                         rs_priv->lq.general_params.start_rate_index[3]);
2057
2058
2059         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2060                 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
2061                         i, le32_to_cpu(rs_priv->lq.rs_table[i].rate_n_flags));
2062
2063         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2064 }
2065
2066 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2067         .write = rs_sta_dbgfs_scale_table_write,
2068         .read = rs_sta_dbgfs_scale_table_read,
2069         .open = open_file_generic,
2070 };
2071 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2072                         char __user *user_buf, size_t count, loff_t *ppos)
2073 {
2074         char buff[1024];
2075         int desc = 0;
2076         int i, j;
2077
2078         struct iwl_rate_scale_priv *rs_priv = file->private_data;
2079         for (i = 0; i < LQ_SIZE; i++) {
2080                 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2081                                 "rate=0x%X\n",
2082                                 rs_priv->active_tbl == i?"*":"x",
2083                                 rs_priv->lq_info[i].lq_type,
2084                                 rs_priv->lq_info[i].is_SGI,
2085                                 rs_priv->lq_info[i].is_fat,
2086                                 rs_priv->lq_info[i].is_dup,
2087                                 rs_priv->lq_info[i].current_rate.rate_n_flags);
2088                 for (j = 0; j < IWL_RATE_COUNT; j++) {
2089                         desc += sprintf(buff+desc,
2090                                         "counter=%d success=%d %%=%d\n",
2091                                         rs_priv->lq_info[i].win[j].counter,
2092                                         rs_priv->lq_info[i].win[j].success_counter,
2093                                         rs_priv->lq_info[i].win[j].success_ratio);
2094                 }
2095         }
2096         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2097 }
2098
2099 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2100         .read = rs_sta_dbgfs_stats_table_read,
2101         .open = open_file_generic,
2102 };
2103
2104 static void rs_add_debugfs(void *priv, void *priv_sta,
2105                                         struct dentry *dir)
2106 {
2107         struct iwl_rate_scale_priv *rs_priv = priv_sta;
2108         rs_priv->rs_sta_dbgfs_scale_table_file =
2109                 debugfs_create_file("rate_scale_table", 0600, dir,
2110                                 rs_priv, &rs_sta_dbgfs_scale_table_ops);
2111         rs_priv->rs_sta_dbgfs_stats_table_file =
2112                 debugfs_create_file("rate_stats_table", 0600, dir,
2113                         rs_priv, &rs_sta_dbgfs_stats_table_ops);
2114 }
2115
2116 static void rs_remove_debugfs(void *priv, void *priv_sta)
2117 {
2118         struct iwl_rate_scale_priv *rs_priv = priv_sta;
2119         debugfs_remove(rs_priv->rs_sta_dbgfs_scale_table_file);
2120         debugfs_remove(rs_priv->rs_sta_dbgfs_stats_table_file);
2121 }
2122 #endif
2123
2124 static struct rate_control_ops rs_ops = {
2125         .module = NULL,
2126         .name = RS_NAME,
2127         .tx_status = rs_tx_status,
2128         .get_rate = rs_get_rate,
2129         .rate_init = rs_rate_init,
2130         .clear = rs_clear,
2131         .alloc = rs_alloc,
2132         .free = rs_free,
2133         .alloc_sta = rs_alloc_sta,
2134         .free_sta = rs_free_sta,
2135 #ifdef CONFIG_MAC80211_DEBUGFS
2136         .add_sta_debugfs = rs_add_debugfs,
2137         .remove_sta_debugfs = rs_remove_debugfs,
2138 #endif
2139 };
2140
2141 int iwl_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id)
2142 {
2143         struct ieee80211_local *local = hw_to_local(hw);
2144         struct iwl_priv *priv = hw->priv;
2145         struct iwl_rate_scale_priv *rs_priv;
2146         struct sta_info *sta;
2147         int count = 0, i;
2148         u32 samples = 0, success = 0, good = 0;
2149         unsigned long now = jiffies;
2150         u32 max_time = 0;
2151         u8 lq_type, antenna;
2152
2153         sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
2154         if (!sta || !sta->rate_ctrl_priv) {
2155                 if (sta) {
2156                         sta_info_put(sta);
2157                         IWL_DEBUG_RATE("leave - no private rate data!\n");
2158                 } else
2159                         IWL_DEBUG_RATE("leave - no station!\n");
2160                 return sprintf(buf, "station %d not found\n", sta_id);
2161         }
2162
2163         rs_priv = (void *)sta->rate_ctrl_priv;
2164
2165         lq_type = rs_priv->lq_info[rs_priv->active_tbl].lq_type;
2166         antenna = rs_priv->lq_info[rs_priv->active_tbl].antenna_type;
2167
2168         if (is_legacy(lq_type))
2169                 i = IWL_RATE_54M_INDEX;
2170         else
2171                 i = IWL_RATE_60M_INDEX;
2172         while (1) {
2173                 u64 mask;
2174                 int j;
2175                 int active = rs_priv->active_tbl;
2176
2177                 count +=
2178                     sprintf(&buf[count], " %2dMbs: ", iwl_rates[i].ieee / 2);
2179
2180                 mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1));
2181                 for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1)
2182                         buf[count++] =
2183                                 (rs_priv->lq_info[active].win[i].data & mask)
2184                                 ? '1' : '0';
2185
2186                 samples += rs_priv->lq_info[active].win[i].counter;
2187                 good += rs_priv->lq_info[active].win[i].success_counter;
2188                 success += rs_priv->lq_info[active].win[i].success_counter *
2189                            iwl_rates[i].ieee;
2190
2191                 if (rs_priv->lq_info[active].win[i].stamp) {
2192                         int delta =
2193                                    jiffies_to_msecs(now -
2194                                    rs_priv->lq_info[active].win[i].stamp);
2195
2196                         if (delta > max_time)
2197                                 max_time = delta;
2198
2199                         count += sprintf(&buf[count], "%5dms\n", delta);
2200                 } else
2201                         buf[count++] = '\n';
2202
2203                 j = iwl_get_prev_ieee_rate(i);
2204                 if (j == i)
2205                         break;
2206                 i = j;
2207         }
2208
2209         /* Display the average rate of all samples taken.
2210          *
2211          * NOTE:  We multiple # of samples by 2 since the IEEE measurement
2212          * added from iwl_rates is actually 2X the rate */
2213         if (samples)
2214                 count += sprintf(&buf[count],
2215                          "\nAverage rate is %3d.%02dMbs over last %4dms\n"
2216                          "%3d%% success (%d good packets over %d tries)\n",
2217                          success / (2 * samples), (success * 5 / samples) % 10,
2218                          max_time, good * 100 / samples, good, samples);
2219         else
2220                 count += sprintf(&buf[count], "\nAverage rate: 0Mbs\n");
2221         count += sprintf(&buf[count], "\nrate scale type %d antenna %d "
2222                          "active_search %d rate index %d\n", lq_type, antenna,
2223                          rs_priv->search_better_tbl, sta->last_txrate);
2224
2225         sta_info_put(sta);
2226         return count;
2227 }
2228
2229 void iwl_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
2230 {
2231         struct iwl_priv *priv = hw->priv;
2232
2233         priv->lq_mngr.lq_ready = 1;
2234 }
2235
2236 void iwl_rate_control_register(struct ieee80211_hw *hw)
2237 {
2238         ieee80211_rate_control_register(&rs_ops);
2239 }
2240
2241 void iwl_rate_control_unregister(struct ieee80211_hw *hw)
2242 {
2243         ieee80211_rate_control_unregister(&rs_ops);
2244 }
2245