drivers/net/wireless/iwlwifi/iwl-agn-rs.h

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2003 - 2010 Intel Corporation. All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  * Contact Information:
  22  *  Intel Linux Wireless <ilw@linux.intel.com>
  23  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  24  *
  25  *****************************************************************************/
  26
  27 #ifndef __iwl_agn_rs_h__
  28 #define __iwl_agn_rs_h__
  29
  30 struct iwl_rate_info {
  31         u8 plcp;        /* uCode API:  IWL_RATE_6M_PLCP, etc. */
  32         u8 plcp_siso;   /* uCode API:  IWL_RATE_SISO_6M_PLCP, etc. */
  33         u8 plcp_mimo2;  /* uCode API:  IWL_RATE_MIMO2_6M_PLCP, etc. */
  34         u8 plcp_mimo3;  /* uCode API:  IWL_RATE_MIMO3_6M_PLCP, etc. */
  35         u8 ieee;        /* MAC header:  IWL_RATE_6M_IEEE, etc. */
  36         u8 prev_ieee;    /* previous rate in IEEE speeds */
  37         u8 next_ieee;    /* next rate in IEEE speeds */
  38         u8 prev_rs;      /* previous rate used in rs algo */
  39         u8 next_rs;      /* next rate used in rs algo */
  40         u8 prev_rs_tgg;  /* previous rate used in TGG rs algo */
  41         u8 next_rs_tgg;  /* next rate used in TGG rs algo */
  42 };
  43
  44 struct iwl3945_rate_info {
  45         u8 plcp;                /* uCode API:  IWL_RATE_6M_PLCP, etc. */
  46         u8 ieee;                /* MAC header:  IWL_RATE_6M_IEEE, etc. */
  47         u8 prev_ieee;           /* previous rate in IEEE speeds */
  48         u8 next_ieee;           /* next rate in IEEE speeds */
  49         u8 prev_rs;             /* previous rate used in rs algo */
  50         u8 next_rs;             /* next rate used in rs algo */
  51         u8 prev_rs_tgg;         /* previous rate used in TGG rs algo */
  52         u8 next_rs_tgg;         /* next rate used in TGG rs algo */
  53         u8 table_rs_index;      /* index in rate scale table cmd */
  54         u8 prev_table_rs;       /* prev in rate table cmd */
  55 };
  56
  57
  58 /*
  59  * These serve as indexes into
  60  * struct iwl_rate_info iwl_rates[IWL_RATE_COUNT];
  61  */
  62 enum {
  63         IWL_RATE_1M_INDEX = 0,
  64         IWL_RATE_2M_INDEX,
  65         IWL_RATE_5M_INDEX,
  66         IWL_RATE_11M_INDEX,
  67         IWL_RATE_6M_INDEX,
  68         IWL_RATE_9M_INDEX,
  69         IWL_RATE_12M_INDEX,
  70         IWL_RATE_18M_INDEX,
  71         IWL_RATE_24M_INDEX,
  72         IWL_RATE_36M_INDEX,
  73         IWL_RATE_48M_INDEX,
  74         IWL_RATE_54M_INDEX,
  75         IWL_RATE_60M_INDEX,
  76         IWL_RATE_COUNT, /*FIXME:RS:change to IWL_RATE_INDEX_COUNT,*/
  77         IWL_RATE_COUNT_LEGACY = IWL_RATE_COUNT - 1,     /* Excluding 60M */
  78         IWL_RATE_COUNT_3945 = IWL_RATE_COUNT - 1,
  79         IWL_RATE_INVM_INDEX = IWL_RATE_COUNT,
  80         IWL_RATE_INVALID = IWL_RATE_COUNT,
  81 };
  82
  83 enum {
  84         IWL_RATE_6M_INDEX_TABLE = 0,
  85         IWL_RATE_9M_INDEX_TABLE,
  86         IWL_RATE_12M_INDEX_TABLE,
  87         IWL_RATE_18M_INDEX_TABLE,
  88         IWL_RATE_24M_INDEX_TABLE,
  89         IWL_RATE_36M_INDEX_TABLE,
  90         IWL_RATE_48M_INDEX_TABLE,
  91         IWL_RATE_54M_INDEX_TABLE,
  92         IWL_RATE_1M_INDEX_TABLE,
  93         IWL_RATE_2M_INDEX_TABLE,
  94         IWL_RATE_5M_INDEX_TABLE,
  95         IWL_RATE_11M_INDEX_TABLE,
  96         IWL_RATE_INVM_INDEX_TABLE = IWL_RATE_INVM_INDEX - 1,
  97 };
  98
  99 enum {
 100         IWL_FIRST_OFDM_RATE = IWL_RATE_6M_INDEX,
 101         IWL39_LAST_OFDM_RATE = IWL_RATE_54M_INDEX,
 102         IWL_LAST_OFDM_RATE = IWL_RATE_60M_INDEX,
 103         IWL_FIRST_CCK_RATE = IWL_RATE_1M_INDEX,
 104         IWL_LAST_CCK_RATE = IWL_RATE_11M_INDEX,
 105 };
 106
 107 /* #define vs. enum to keep from defaulting to 'large integer' */
 108 #define IWL_RATE_6M_MASK   (1 << IWL_RATE_6M_INDEX)
 109 #define IWL_RATE_9M_MASK   (1 << IWL_RATE_9M_INDEX)
 110 #define IWL_RATE_12M_MASK  (1 << IWL_RATE_12M_INDEX)
 111 #define IWL_RATE_18M_MASK  (1 << IWL_RATE_18M_INDEX)
 112 #define IWL_RATE_24M_MASK  (1 << IWL_RATE_24M_INDEX)
 113 #define IWL_RATE_36M_MASK  (1 << IWL_RATE_36M_INDEX)
 114 #define IWL_RATE_48M_MASK  (1 << IWL_RATE_48M_INDEX)
 115 #define IWL_RATE_54M_MASK  (1 << IWL_RATE_54M_INDEX)
 116 #define IWL_RATE_60M_MASK  (1 << IWL_RATE_60M_INDEX)
 117 #define IWL_RATE_1M_MASK   (1 << IWL_RATE_1M_INDEX)
 118 #define IWL_RATE_2M_MASK   (1 << IWL_RATE_2M_INDEX)
 119 #define IWL_RATE_5M_MASK   (1 << IWL_RATE_5M_INDEX)
 120 #define IWL_RATE_11M_MASK  (1 << IWL_RATE_11M_INDEX)
 121
 122 /* uCode API values for legacy bit rates, both OFDM and CCK */
 123 enum {
 124         IWL_RATE_6M_PLCP  = 13,
 125         IWL_RATE_9M_PLCP  = 15,
 126         IWL_RATE_12M_PLCP = 5,
 127         IWL_RATE_18M_PLCP = 7,
 128         IWL_RATE_24M_PLCP = 9,
 129         IWL_RATE_36M_PLCP = 11,
 130         IWL_RATE_48M_PLCP = 1,
 131         IWL_RATE_54M_PLCP = 3,
 132         IWL_RATE_60M_PLCP = 3,/*FIXME:RS:should be removed*/
 133         IWL_RATE_1M_PLCP  = 10,
 134         IWL_RATE_2M_PLCP  = 20,
 135         IWL_RATE_5M_PLCP  = 55,
 136         IWL_RATE_11M_PLCP = 110,
 137         /*FIXME:RS:change to IWL_RATE_LEGACY_??M_PLCP */
 138         /*FIXME:RS:add IWL_RATE_LEGACY_INVM_PLCP = 0,*/
 139 };
 140
 141 /* uCode API values for OFDM high-throughput (HT) bit rates */
 142 enum {
 143         IWL_RATE_SISO_6M_PLCP = 0,
 144         IWL_RATE_SISO_12M_PLCP = 1,
 145         IWL_RATE_SISO_18M_PLCP = 2,
 146         IWL_RATE_SISO_24M_PLCP = 3,
 147         IWL_RATE_SISO_36M_PLCP = 4,
 148         IWL_RATE_SISO_48M_PLCP = 5,
 149         IWL_RATE_SISO_54M_PLCP = 6,
 150         IWL_RATE_SISO_60M_PLCP = 7,
 151         IWL_RATE_MIMO2_6M_PLCP  = 0x8,
 152         IWL_RATE_MIMO2_12M_PLCP = 0x9,
 153         IWL_RATE_MIMO2_18M_PLCP = 0xa,
 154         IWL_RATE_MIMO2_24M_PLCP = 0xb,
 155         IWL_RATE_MIMO2_36M_PLCP = 0xc,
 156         IWL_RATE_MIMO2_48M_PLCP = 0xd,
 157         IWL_RATE_MIMO2_54M_PLCP = 0xe,
 158         IWL_RATE_MIMO2_60M_PLCP = 0xf,
 159         IWL_RATE_MIMO3_6M_PLCP  = 0x10,
 160         IWL_RATE_MIMO3_12M_PLCP = 0x11,
 161         IWL_RATE_MIMO3_18M_PLCP = 0x12,
 162         IWL_RATE_MIMO3_24M_PLCP = 0x13,
 163         IWL_RATE_MIMO3_36M_PLCP = 0x14,
 164         IWL_RATE_MIMO3_48M_PLCP = 0x15,
 165         IWL_RATE_MIMO3_54M_PLCP = 0x16,
 166         IWL_RATE_MIMO3_60M_PLCP = 0x17,
 167         IWL_RATE_SISO_INVM_PLCP,
 168         IWL_RATE_MIMO2_INVM_PLCP = IWL_RATE_SISO_INVM_PLCP,
 169         IWL_RATE_MIMO3_INVM_PLCP = IWL_RATE_SISO_INVM_PLCP,
 170 };
 171
 172 /* MAC header values for bit rates */
 173 enum {
 174         IWL_RATE_6M_IEEE  = 12,
 175         IWL_RATE_9M_IEEE  = 18,
 176         IWL_RATE_12M_IEEE = 24,
 177         IWL_RATE_18M_IEEE = 36,
 178         IWL_RATE_24M_IEEE = 48,
 179         IWL_RATE_36M_IEEE = 72,
 180         IWL_RATE_48M_IEEE = 96,
 181         IWL_RATE_54M_IEEE = 108,
 182         IWL_RATE_60M_IEEE = 120,
 183         IWL_RATE_1M_IEEE  = 2,
 184         IWL_RATE_2M_IEEE  = 4,
 185         IWL_RATE_5M_IEEE  = 11,
 186         IWL_RATE_11M_IEEE = 22,
 187 };
 188
 189 #define IWL_CCK_BASIC_RATES_MASK    \
 190        (IWL_RATE_1M_MASK          | \
 191         IWL_RATE_2M_MASK)
 192
 193 #define IWL_CCK_RATES_MASK          \
 194        (IWL_CCK_BASIC_RATES_MASK  | \
 195         IWL_RATE_5M_MASK          | \
 196         IWL_RATE_11M_MASK)
 197
 198 #define IWL_OFDM_BASIC_RATES_MASK   \
 199         (IWL_RATE_6M_MASK         | \
 200         IWL_RATE_12M_MASK         | \
 201         IWL_RATE_24M_MASK)
 202
 203 #define IWL_OFDM_RATES_MASK         \
 204        (IWL_OFDM_BASIC_RATES_MASK | \
 205         IWL_RATE_9M_MASK          | \
 206         IWL_RATE_18M_MASK         | \
 207         IWL_RATE_36M_MASK         | \
 208         IWL_RATE_48M_MASK         | \
 209         IWL_RATE_54M_MASK)
 210
 211 #define IWL_BASIC_RATES_MASK         \
 212         (IWL_OFDM_BASIC_RATES_MASK | \
 213          IWL_CCK_BASIC_RATES_MASK)
 214
 215 #define IWL_RATES_MASK ((1 << IWL_RATE_COUNT) - 1)
 216
 217 #define IWL_INVALID_VALUE    -1
 218
 219 #define IWL_MIN_RSSI_VAL                 -100
 220 #define IWL_MAX_RSSI_VAL                    0
 221
 222 /* These values specify how many Tx frame attempts before
 223  * searching for a new modulation mode */
 224 #define IWL_LEGACY_FAILURE_LIMIT        160
 225 #define IWL_LEGACY_SUCCESS_LIMIT        480
 226 #define IWL_LEGACY_TABLE_COUNT          160
 227
 228 #define IWL_NONE_LEGACY_FAILURE_LIMIT   400
 229 #define IWL_NONE_LEGACY_SUCCESS_LIMIT   4500
 230 #define IWL_NONE_LEGACY_TABLE_COUNT     1500
 231
 232 /* Success ratio (ACKed / attempted tx frames) values (perfect is 128 * 100) */
 233 #define IWL_RS_GOOD_RATIO               12800   /* 100% */
 234 #define IWL_RATE_SCALE_SWITCH           10880   /*  85% */
 235 #define IWL_RATE_HIGH_TH                10880   /*  85% */
 236 #define IWL_RATE_INCREASE_TH            6400    /*  50% */
 237 #define IWL_RATE_DECREASE_TH            1920    /*  15% */
 238
 239 /* possible actions when in legacy mode */
 240 #define IWL_LEGACY_SWITCH_ANTENNA1      0
 241 #define IWL_LEGACY_SWITCH_ANTENNA2      1
 242 #define IWL_LEGACY_SWITCH_SISO          2
 243 #define IWL_LEGACY_SWITCH_MIMO2_AB      3
 244 #define IWL_LEGACY_SWITCH_MIMO2_AC      4
 245 #define IWL_LEGACY_SWITCH_MIMO2_BC      5
 246 #define IWL_LEGACY_SWITCH_MIMO3_ABC     6
 247
 248 /* possible actions when in siso mode */
 249 #define IWL_SISO_SWITCH_ANTENNA1        0
 250 #define IWL_SISO_SWITCH_ANTENNA2        1
 251 #define IWL_SISO_SWITCH_MIMO2_AB        2
 252 #define IWL_SISO_SWITCH_MIMO2_AC        3
 253 #define IWL_SISO_SWITCH_MIMO2_BC        4
 254 #define IWL_SISO_SWITCH_GI              5
 255 #define IWL_SISO_SWITCH_MIMO3_ABC       6
 256
 257
 258 /* possible actions when in mimo mode */
 259 #define IWL_MIMO2_SWITCH_ANTENNA1       0
 260 #define IWL_MIMO2_SWITCH_ANTENNA2       1
 261 #define IWL_MIMO2_SWITCH_SISO_A         2
 262 #define IWL_MIMO2_SWITCH_SISO_B         3
 263 #define IWL_MIMO2_SWITCH_SISO_C         4
 264 #define IWL_MIMO2_SWITCH_GI             5
 265 #define IWL_MIMO2_SWITCH_MIMO3_ABC      6
 266
 267
 268 /* possible actions when in mimo3 mode */
 269 #define IWL_MIMO3_SWITCH_ANTENNA1       0
 270 #define IWL_MIMO3_SWITCH_ANTENNA2       1
 271 #define IWL_MIMO3_SWITCH_SISO_A         2
 272 #define IWL_MIMO3_SWITCH_SISO_B         3
 273 #define IWL_MIMO3_SWITCH_SISO_C         4
 274 #define IWL_MIMO3_SWITCH_MIMO2_AB       5
 275 #define IWL_MIMO3_SWITCH_MIMO2_AC       6
 276 #define IWL_MIMO3_SWITCH_MIMO2_BC       7
 277 #define IWL_MIMO3_SWITCH_GI             8
 278
 279
 280 #define IWL_MAX_11N_MIMO3_SEARCH IWL_MIMO3_SWITCH_GI
 281 #define IWL_MAX_SEARCH IWL_MIMO2_SWITCH_MIMO3_ABC
 282
 283 /*FIXME:RS:add possible actions for MIMO3*/
 284
 285 #define IWL_ACTION_LIMIT                3       /* # possible actions */
 286
 287 #define LQ_SIZE         2       /* 2 mode tables:  "Active" and "Search" */
 288
 289 /* load per tid defines for A-MPDU activation */
 290 #define IWL_AGG_TPT_THREHOLD    0
 291 #define IWL_AGG_LOAD_THRESHOLD  10
 292 #define IWL_AGG_ALL_TID         0xff
 293 #define TID_QUEUE_CELL_SPACING  50      /*mS */
 294 #define TID_QUEUE_MAX_SIZE      20
 295 #define TID_ROUND_VALUE         5       /* mS */
 296 #define TID_MAX_LOAD_COUNT      8
 297
 298 #define TID_MAX_TIME_DIFF ((TID_QUEUE_MAX_SIZE - 1) * TID_QUEUE_CELL_SPACING)
 299 #define TIME_WRAP_AROUND(x, y) (((y) > (x)) ? (y) - (x) : (0-(x)) + (y))
 300
 301 extern const struct iwl_rate_info iwl_rates[IWL_RATE_COUNT];
 302
 303 enum iwl_table_type {
 304         LQ_NONE,
 305         LQ_G,           /* legacy types */
 306         LQ_A,
 307         LQ_SISO,        /* high-throughput types */
 308         LQ_MIMO2,
 309         LQ_MIMO3,
 310         LQ_MAX,
 311 };
 312
 313 #define is_legacy(tbl) (((tbl) == LQ_G) || ((tbl) == LQ_A))
 314 #define is_siso(tbl) ((tbl) == LQ_SISO)
 315 #define is_mimo2(tbl) ((tbl) == LQ_MIMO2)
 316 #define is_mimo3(tbl) ((tbl) == LQ_MIMO3)
 317 #define is_mimo(tbl) (is_mimo2(tbl) || is_mimo3(tbl))
 318 #define is_Ht(tbl) (is_siso(tbl) || is_mimo(tbl))
 319 #define is_a_band(tbl) ((tbl) == LQ_A)
 320 #define is_g_and(tbl) ((tbl) == LQ_G)
 321
 322 #define ANT_NONE        0x0
 323 #define ANT_A           BIT(0)
 324 #define ANT_B           BIT(1)
 325 #define ANT_AB          (ANT_A | ANT_B)
 326 #define ANT_C           BIT(2)
 327 #define ANT_AC          (ANT_A | ANT_C)
 328 #define ANT_BC          (ANT_B | ANT_C)
 329 #define ANT_ABC         (ANT_AB | ANT_C)
 330
 331 #define IWL_MAX_MCS_DISPLAY_SIZE        12
 332
 333 struct iwl_rate_mcs_info {
 334         char    mbps[IWL_MAX_MCS_DISPLAY_SIZE];
 335         char    mcs[IWL_MAX_MCS_DISPLAY_SIZE];
 336 };
 337
 338 /**
 339  * struct iwl_rate_scale_data -- tx success history for one rate
 340  */
 341 struct iwl_rate_scale_data {
 342         u64 data;               /* bitmap of successful frames */
 343         s32 success_counter;    /* number of frames successful */
 344         s32 success_ratio;      /* per-cent * 128  */
 345         s32 counter;            /* number of frames attempted */
 346         s32 average_tpt;        /* success ratio * expected throughput */
 347         unsigned long stamp;
 348 };
 349
 350 /**
 351  * struct iwl_scale_tbl_info -- tx params and success history for all rates
 352  *
 353  * There are two of these in struct iwl_lq_sta,
 354  * one for "active", and one for "search".
 355  */
 356 struct iwl_scale_tbl_info {
 357         enum iwl_table_type lq_type;
 358         u8 ant_type;
 359         u8 is_SGI;      /* 1 = short guard interval */
 360         u8 is_ht40;     /* 1 = 40 MHz channel width */
 361         u8 is_dup;      /* 1 = duplicated data streams */
 362         u8 action;      /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
 363         u8 max_search;  /* maximun number of tables we can search */
 364         s32 *expected_tpt;      /* throughput metrics; expected_tpt_G, etc. */
 365         u32 current_rate;  /* rate_n_flags, uCode API format */
 366         struct iwl_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
 367 };
 368
 369 struct iwl_traffic_load {
 370         unsigned long time_stamp;       /* age of the oldest statistics */
 371         u32 packet_count[TID_QUEUE_MAX_SIZE];   /* packet count in this time
 372                                                  * slice */
 373         u32 total;                      /* total num of packets during the
 374                                          * last TID_MAX_TIME_DIFF */
 375         u8 queue_count;                 /* number of queues that has
 376                                          * been used since the last cleanup */
 377         u8 head;                        /* start of the circular buffer */
 378 };
 379
 380 /**
 381  * struct iwl_lq_sta -- driver's rate scaling private structure
 382  *
 383  * Pointer to this gets passed back and forth between driver and mac80211.
 384  */
 385 struct iwl_lq_sta {
 386         u8 active_tbl;          /* index of active table, range 0-1 */
 387         u8 enable_counter;      /* indicates HT mode */
 388         u8 stay_in_tbl;         /* 1: disallow, 0: allow search for new mode */
 389         u8 search_better_tbl;   /* 1: currently trying alternate mode */
 390         s32 last_tpt;
 391
 392         /* The following determine when to search for a new mode */
 393         u32 table_count_limit;
 394         u32 max_failure_limit;  /* # failed frames before new search */
 395         u32 max_success_limit;  /* # successful frames before new search */
 396         u32 table_count;
 397         u32 total_failed;       /* total failed frames, any/all rates */
 398         u32 total_success;      /* total successful frames, any/all rates */
 399         u64 flush_timer;        /* time staying in mode before new search */
 400
 401         u8 action_counter;      /* # mode-switch actions tried */
 402         u8 is_green;
 403         u8 is_dup;
 404         enum ieee80211_band band;
 405
 406         /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
 407         u32 supp_rates;
 408         u16 active_legacy_rate;
 409         u16 active_siso_rate;
 410         u16 active_mimo2_rate;
 411         u16 active_mimo3_rate;
 412         s8 max_rate_idx;     /* Max rate set by user */
 413         u8 missed_rate_counter;
 414
 415         struct iwl_link_quality_cmd lq;
 416         struct iwl_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
 417         struct iwl_traffic_load load[TID_MAX_LOAD_COUNT];
 418         u8 tx_agg_tid_en;
 419 #ifdef CONFIG_MAC80211_DEBUGFS
 420         struct dentry *rs_sta_dbgfs_scale_table_file;
 421         struct dentry *rs_sta_dbgfs_stats_table_file;
 422         struct dentry *rs_sta_dbgfs_rate_scale_data_file;
 423         struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
 424         u32 dbg_fixed_rate;
 425 #endif
 426         struct iwl_priv *drv;
 427
 428         /* used to be in sta_info */
 429         int last_txrate_idx;
 430         /* last tx rate_n_flags */
 431         u32 last_rate_n_flags;
 432         /* packets destined for this STA are aggregated */
 433         u8 is_agg;
 434         /* BT traffic this sta was last updated in */
 435         u8 last_bt_traffic;
 436 };
 437
 438 static inline u8 num_of_ant(u8 mask)
 439 {
 440         return  !!((mask) & ANT_A) +
 441                 !!((mask) & ANT_B) +
 442                 !!((mask) & ANT_C);
 443 }
 444
 445 static inline u8 first_antenna(u8 mask)
 446 {
 447         if (mask & ANT_A)
 448                 return ANT_A;
 449         if (mask & ANT_B)
 450                 return ANT_B;
 451         return ANT_C;
 452 }
 453
 454
 455 /**
 456  * iwl3945_rate_scale_init - Initialize the rate scale table based on assoc info
 457  *
 458  * The specific throughput table used is based on the type of network
 459  * the associated with, including A, B, G, and G w/ TGG protection
 460  */
 461 extern void iwl3945_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id);
 462
 463 /* Initialize station's rate scaling information after adding station */
 464 extern void iwl_rs_rate_init(struct iwl_priv *priv,
 465                              struct ieee80211_sta *sta, u8 sta_id);
 466 extern void iwl3945_rs_rate_init(struct iwl_priv *priv,
 467                                  struct ieee80211_sta *sta, u8 sta_id);
 468
 469 /**
 470  * iwl_rate_control_register - Register the rate control algorithm callbacks
 471  *
 472  * Since the rate control algorithm is hardware specific, there is no need
 473  * or reason to place it as a stand alone module.  The driver can call
 474  * iwl_rate_control_register in order to register the rate control callbacks
 475  * with the mac80211 subsystem.  This should be performed prior to calling
 476  * ieee80211_register_hw
 477  *
 478  */
 479 extern int iwlagn_rate_control_register(void);
 480 extern int iwl3945_rate_control_register(void);
 481
 482 /**
 483  * iwl_rate_control_unregister - Unregister the rate control callbacks
 484  *
 485  * This should be called after calling ieee80211_unregister_hw, but before
 486  * the driver is unloaded.
 487  */
 488 extern void iwlagn_rate_control_unregister(void);
 489 extern void iwl3945_rate_control_unregister(void);
 490
 491 #endif /* __iwl_agn__rs__ */