1 // SPDX-License-Identifier: GPL-2.0-only 2 /****************************************************************************** 3 * 4 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved. 5 * Copyright (C) 2019 - 2020, 2022 Intel Corporation 6 *****************************************************************************/ 7 #include <linux/kernel.h> 8 #include <linux/skbuff.h> 9 #include <linux/slab.h> 10 #include <net/mac80211.h> 11 12 #include <linux/netdevice.h> 13 #include <linux/etherdevice.h> 14 #include <linux/delay.h> 15 16 #include <linux/workqueue.h> 17 18 #include "dev.h" 19 #include "agn.h" 20 21 #define RS_NAME "iwl-agn-rs" 22 23 #define NUM_TRY_BEFORE_ANT_TOGGLE 1 24 #define IWL_NUMBER_TRY 1 25 #define IWL_HT_NUMBER_TRY 3 26 27 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */ 28 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */ 29 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */ 30 31 /* max allowed rate miss before sync LQ cmd */ 32 #define IWL_MISSED_RATE_MAX 15 33 /* max time to accum history 2 seconds */ 34 #define IWL_RATE_SCALE_FLUSH_INTVL (3*HZ) 35 36 static u8 rs_ht_to_legacy[] = { 37 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX, 38 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX, 39 IWL_RATE_6M_INDEX, 40 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX, 41 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX, 42 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX, 43 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX 44 }; 45 46 static const u8 ant_toggle_lookup[] = { 47 /*ANT_NONE -> */ ANT_NONE, 48 /*ANT_A -> */ ANT_B, 49 /*ANT_B -> */ ANT_C, 50 /*ANT_AB -> */ ANT_BC, 51 /*ANT_C -> */ ANT_A, 52 /*ANT_AC -> */ ANT_AB, 53 /*ANT_BC -> */ ANT_AC, 54 /*ANT_ABC -> */ ANT_ABC, 55 }; 56 57 #define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np) \ 58 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \ 59 IWL_RATE_SISO_##s##M_PLCP, \ 60 IWL_RATE_MIMO2_##s##M_PLCP,\ 61 IWL_RATE_MIMO3_##s##M_PLCP,\ 62 IWL_RATE_##r##M_IEEE, \ 63 IWL_RATE_##ip##M_INDEX, \ 64 IWL_RATE_##in##M_INDEX, \ 65 IWL_RATE_##rp##M_INDEX, \ 66 IWL_RATE_##rn##M_INDEX, \ 67 IWL_RATE_##pp##M_INDEX, \ 68 IWL_RATE_##np##M_INDEX } 69 70 /* 71 * Parameter order: 72 * rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate 73 * 74 * If there isn't a valid next or previous rate then INV is used which 75 * maps to IWL_RATE_INVALID 76 * 77 */ 78 const struct iwl_rate_info iwl_rates[IWL_RATE_COUNT] = { 79 IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2), /* 1mbps */ 80 IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5), /* 2mbps */ 81 IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11), /*5.5mbps */ 82 IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18), /* 11mbps */ 83 IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11), /* 6mbps */ 84 IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11), /* 9mbps */ 85 IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18), /* 12mbps */ 86 IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24), /* 18mbps */ 87 IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36), /* 24mbps */ 88 IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48), /* 36mbps */ 89 IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54), /* 48mbps */ 90 IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */ 91 IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */ 92 /* FIXME:RS: ^^ should be INV (legacy) */ 93 }; 94 95 static inline u8 rs_extract_rate(u32 rate_n_flags) 96 { 97 return (u8)(rate_n_flags & RATE_MCS_RATE_MSK); 98 } 99 100 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags) 101 { 102 int idx = 0; 103 104 /* HT rate format */ 105 if (rate_n_flags & RATE_MCS_HT_MSK) { 106 idx = rs_extract_rate(rate_n_flags); 107 108 if (idx >= IWL_RATE_MIMO3_6M_PLCP) 109 idx = idx - IWL_RATE_MIMO3_6M_PLCP; 110 else if (idx >= IWL_RATE_MIMO2_6M_PLCP) 111 idx = idx - IWL_RATE_MIMO2_6M_PLCP; 112 113 idx += IWL_FIRST_OFDM_RATE; 114 /* skip 9M not supported in ht*/ 115 if (idx >= IWL_RATE_9M_INDEX) 116 idx += 1; 117 if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE)) 118 return idx; 119 120 /* legacy rate format, search for match in table */ 121 } else { 122 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++) 123 if (iwl_rates[idx].plcp == 124 rs_extract_rate(rate_n_flags)) 125 return idx; 126 } 127 128 return -1; 129 } 130 131 static void rs_rate_scale_perform(struct iwl_priv *priv, 132 struct sk_buff *skb, 133 struct ieee80211_sta *sta, 134 struct iwl_lq_sta *lq_sta); 135 static void rs_fill_link_cmd(struct iwl_priv *priv, 136 struct iwl_lq_sta *lq_sta, u32 rate_n_flags); 137 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search); 138 139 140 #ifdef CONFIG_MAC80211_DEBUGFS 141 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta, 142 u32 *rate_n_flags, int index); 143 #else 144 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta, 145 u32 *rate_n_flags, int index) 146 {} 147 #endif 148 149 /* 150 * The following tables contain the expected throughput metrics for all rates 151 * 152 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits 153 * 154 * where invalid entries are zeros. 155 * 156 * CCK rates are only valid in legacy table and will only be used in G 157 * (2.4 GHz) band. 158 */ 159 160 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = { 161 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0 162 }; 163 164 static const u16 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = { 165 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202}, /* Norm */ 166 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210}, /* SGI */ 167 {0, 0, 0, 0, 47, 0, 91, 133, 171, 242, 305, 334, 362}, /* AGG */ 168 {0, 0, 0, 0, 52, 0, 101, 145, 187, 264, 330, 361, 390}, /* AGG+SGI */ 169 }; 170 171 static const u16 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = { 172 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */ 173 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */ 174 {0, 0, 0, 0, 94, 0, 177, 249, 313, 423, 512, 550, 586}, /* AGG */ 175 {0, 0, 0, 0, 104, 0, 193, 270, 338, 454, 545, 584, 620}, /* AGG+SGI */ 176 }; 177 178 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = { 179 {0, 0, 0, 0, 74, 0, 123, 155, 179, 214, 236, 244, 251}, /* Norm */ 180 {0, 0, 0, 0, 81, 0, 131, 164, 188, 223, 243, 251, 257}, /* SGI */ 181 {0, 0, 0, 0, 89, 0, 167, 235, 296, 402, 488, 526, 560}, /* AGG */ 182 {0, 0, 0, 0, 97, 0, 182, 255, 320, 431, 520, 558, 593}, /* AGG+SGI*/ 183 }; 184 185 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = { 186 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */ 187 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */ 188 {0, 0, 0, 0, 171, 0, 305, 410, 496, 634, 731, 771, 805}, /* AGG */ 189 {0, 0, 0, 0, 186, 0, 329, 439, 527, 667, 764, 803, 838}, /* AGG+SGI */ 190 }; 191 192 static const u16 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = { 193 {0, 0, 0, 0, 99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */ 194 {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */ 195 {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */ 196 {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */ 197 }; 198 199 static const u16 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = { 200 {0, 0, 0, 0, 152, 0, 211, 239, 255, 279, 290, 294, 297}, /* Norm */ 201 {0, 0, 0, 0, 160, 0, 219, 245, 261, 284, 294, 297, 300}, /* SGI */ 202 {0, 0, 0, 0, 254, 0, 443, 584, 695, 868, 984, 1030, 1070}, /* AGG */ 203 {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */ 204 }; 205 206 /* mbps, mcs */ 207 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = { 208 { "1", "BPSK DSSS"}, 209 { "2", "QPSK DSSS"}, 210 {"5.5", "BPSK CCK"}, 211 { "11", "QPSK CCK"}, 212 { "6", "BPSK 1/2"}, 213 { "9", "BPSK 1/2"}, 214 { "12", "QPSK 1/2"}, 215 { "18", "QPSK 3/4"}, 216 { "24", "16QAM 1/2"}, 217 { "36", "16QAM 3/4"}, 218 { "48", "64QAM 2/3"}, 219 { "54", "64QAM 3/4"}, 220 { "60", "64QAM 5/6"}, 221 }; 222 223 #define MCS_INDEX_PER_STREAM (8) 224 225 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window) 226 { 227 window->data = 0; 228 window->success_counter = 0; 229 window->success_ratio = IWL_INVALID_VALUE; 230 window->counter = 0; 231 window->average_tpt = IWL_INVALID_VALUE; 232 window->stamp = 0; 233 } 234 235 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type) 236 { 237 return (ant_type & valid_antenna) == ant_type; 238 } 239 240 /* 241 * removes the old data from the statistics. All data that is older than 242 * TID_MAX_TIME_DIFF, will be deleted. 243 */ 244 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time) 245 { 246 /* The oldest age we want to keep */ 247 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF; 248 249 while (tl->queue_count && 250 (tl->time_stamp < oldest_time)) { 251 tl->total -= tl->packet_count[tl->head]; 252 tl->packet_count[tl->head] = 0; 253 tl->time_stamp += TID_QUEUE_CELL_SPACING; 254 tl->queue_count--; 255 tl->head++; 256 if (tl->head >= TID_QUEUE_MAX_SIZE) 257 tl->head = 0; 258 } 259 } 260 261 /* 262 * increment traffic load value for tid and also remove 263 * any old values if passed the certain time period 264 */ 265 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data, 266 struct ieee80211_hdr *hdr) 267 { 268 u32 curr_time = jiffies_to_msecs(jiffies); 269 u32 time_diff; 270 s32 index; 271 struct iwl_traffic_load *tl = NULL; 272 u8 tid; 273 274 if (ieee80211_is_data_qos(hdr->frame_control)) { 275 u8 *qc = ieee80211_get_qos_ctl(hdr); 276 tid = qc[0] & 0xf; 277 } else 278 return IWL_MAX_TID_COUNT; 279 280 if (unlikely(tid >= IWL_MAX_TID_COUNT)) 281 return IWL_MAX_TID_COUNT; 282 283 tl = &lq_data->load[tid]; 284 285 curr_time -= curr_time % TID_ROUND_VALUE; 286 287 /* Happens only for the first packet. Initialize the data */ 288 if (!(tl->queue_count)) { 289 tl->total = 1; 290 tl->time_stamp = curr_time; 291 tl->queue_count = 1; 292 tl->head = 0; 293 tl->packet_count[0] = 1; 294 return IWL_MAX_TID_COUNT; 295 } 296 297 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time); 298 index = time_diff / TID_QUEUE_CELL_SPACING; 299 300 /* The history is too long: remove data that is older than */ 301 /* TID_MAX_TIME_DIFF */ 302 if (index >= TID_QUEUE_MAX_SIZE) 303 rs_tl_rm_old_stats(tl, curr_time); 304 305 index = (tl->head + index) % TID_QUEUE_MAX_SIZE; 306 tl->packet_count[index] = tl->packet_count[index] + 1; 307 tl->total = tl->total + 1; 308 309 if ((index + 1) > tl->queue_count) 310 tl->queue_count = index + 1; 311 312 return tid; 313 } 314 315 #ifdef CONFIG_MAC80211_DEBUGFS 316 /* 317 * Program the device to use fixed rate for frame transmit 318 * This is for debugging/testing only 319 * once the device start use fixed rate, we need to reload the module 320 * to being back the normal operation. 321 */ 322 static void rs_program_fix_rate(struct iwl_priv *priv, 323 struct iwl_lq_sta *lq_sta) 324 { 325 struct iwl_station_priv *sta_priv = 326 container_of(lq_sta, struct iwl_station_priv, lq_sta); 327 struct iwl_rxon_context *ctx = sta_priv->ctx; 328 329 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */ 330 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 331 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 332 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 333 334 IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n", 335 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate); 336 337 if (lq_sta->dbg_fixed_rate) { 338 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate); 339 iwl_send_lq_cmd(lq_sta->drv, ctx, &lq_sta->lq, CMD_ASYNC, 340 false); 341 } 342 } 343 #endif 344 345 /* 346 get the traffic load value for tid 347 */ 348 static void rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid) 349 { 350 u32 curr_time = jiffies_to_msecs(jiffies); 351 u32 time_diff; 352 s32 index; 353 struct iwl_traffic_load *tl = NULL; 354 355 if (tid >= IWL_MAX_TID_COUNT) 356 return; 357 358 tl = &(lq_data->load[tid]); 359 360 curr_time -= curr_time % TID_ROUND_VALUE; 361 362 if (!(tl->queue_count)) 363 return; 364 365 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time); 366 index = time_diff / TID_QUEUE_CELL_SPACING; 367 368 /* The history is too long: remove data that is older than */ 369 /* TID_MAX_TIME_DIFF */ 370 if (index >= TID_QUEUE_MAX_SIZE) 371 rs_tl_rm_old_stats(tl, curr_time); 372 } 373 374 static int rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv, 375 struct iwl_lq_sta *lq_data, u8 tid, 376 struct ieee80211_sta *sta) 377 { 378 int ret = -EAGAIN; 379 380 /* 381 * Don't create TX aggregation sessions when in high 382 * BT traffic, as they would just be disrupted by BT. 383 */ 384 if (priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) { 385 IWL_DEBUG_COEX(priv, 386 "BT traffic (%d), no aggregation allowed\n", 387 priv->bt_traffic_load); 388 return ret; 389 } 390 391 rs_tl_get_load(lq_data, tid); 392 393 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n", 394 sta->addr, tid); 395 ret = ieee80211_start_tx_ba_session(sta, tid, 5000); 396 if (ret == -EAGAIN) { 397 /* 398 * driver and mac80211 is out of sync 399 * this might be cause by reloading firmware 400 * stop the tx ba session here 401 */ 402 IWL_ERR(priv, "Fail start Tx agg on tid: %d\n", 403 tid); 404 ieee80211_stop_tx_ba_session(sta, tid); 405 } 406 return ret; 407 } 408 409 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid, 410 struct iwl_lq_sta *lq_data, 411 struct ieee80211_sta *sta) 412 { 413 if (tid < IWL_MAX_TID_COUNT) 414 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta); 415 else 416 IWL_ERR(priv, "tid exceeds max TID count: %d/%d\n", 417 tid, IWL_MAX_TID_COUNT); 418 } 419 420 static inline int get_num_of_ant_from_rate(u32 rate_n_flags) 421 { 422 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) + 423 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) + 424 !!(rate_n_flags & RATE_MCS_ANT_C_MSK); 425 } 426 427 /* 428 * Static function to get the expected throughput from an iwl_scale_tbl_info 429 * that wraps a NULL pointer check 430 */ 431 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index) 432 { 433 if (tbl->expected_tpt) 434 return tbl->expected_tpt[rs_index]; 435 return 0; 436 } 437 438 /* 439 * rs_collect_tx_data - Update the success/failure sliding window 440 * 441 * We keep a sliding window of the last 62 packets transmitted 442 * at this rate. window->data contains the bitmask of successful 443 * packets. 444 */ 445 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl, 446 int scale_index, int attempts, int successes) 447 { 448 struct iwl_rate_scale_data *window = NULL; 449 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1)); 450 s32 fail_count, tpt; 451 452 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT) 453 return -EINVAL; 454 455 /* Select window for current tx bit rate */ 456 window = &(tbl->win[scale_index]); 457 458 /* Get expected throughput */ 459 tpt = get_expected_tpt(tbl, scale_index); 460 461 /* 462 * Keep track of only the latest 62 tx frame attempts in this rate's 463 * history window; anything older isn't really relevant any more. 464 * If we have filled up the sliding window, drop the oldest attempt; 465 * if the oldest attempt (highest bit in bitmap) shows "success", 466 * subtract "1" from the success counter (this is the main reason 467 * we keep these bitmaps!). 468 */ 469 while (attempts > 0) { 470 if (window->counter >= IWL_RATE_MAX_WINDOW) { 471 472 /* remove earliest */ 473 window->counter = IWL_RATE_MAX_WINDOW - 1; 474 475 if (window->data & mask) { 476 window->data &= ~mask; 477 window->success_counter--; 478 } 479 } 480 481 /* Increment frames-attempted counter */ 482 window->counter++; 483 484 /* Shift bitmap by one frame to throw away oldest history */ 485 window->data <<= 1; 486 487 /* Mark the most recent #successes attempts as successful */ 488 if (successes > 0) { 489 window->success_counter++; 490 window->data |= 0x1; 491 successes--; 492 } 493 494 attempts--; 495 } 496 497 /* Calculate current success ratio, avoid divide-by-0! */ 498 if (window->counter > 0) 499 window->success_ratio = 128 * (100 * window->success_counter) 500 / window->counter; 501 else 502 window->success_ratio = IWL_INVALID_VALUE; 503 504 fail_count = window->counter - window->success_counter; 505 506 /* Calculate average throughput, if we have enough history. */ 507 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) || 508 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH)) 509 window->average_tpt = (window->success_ratio * tpt + 64) / 128; 510 else 511 window->average_tpt = IWL_INVALID_VALUE; 512 513 /* Tag this window as having been updated */ 514 window->stamp = jiffies; 515 516 return 0; 517 } 518 519 /* 520 * Fill uCode API rate_n_flags field, based on "search" or "active" table. 521 */ 522 /* FIXME:RS:remove this function and put the flags statically in the table */ 523 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv, 524 struct iwl_scale_tbl_info *tbl, 525 int index, u8 use_green) 526 { 527 u32 rate_n_flags = 0; 528 529 if (is_legacy(tbl->lq_type)) { 530 rate_n_flags = iwl_rates[index].plcp; 531 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE) 532 rate_n_flags |= RATE_MCS_CCK_MSK; 533 534 } else if (is_Ht(tbl->lq_type)) { 535 if (index > IWL_LAST_OFDM_RATE) { 536 IWL_ERR(priv, "Invalid HT rate index %d\n", index); 537 index = IWL_LAST_OFDM_RATE; 538 } 539 rate_n_flags = RATE_MCS_HT_MSK; 540 541 if (is_siso(tbl->lq_type)) 542 rate_n_flags |= iwl_rates[index].plcp_siso; 543 else if (is_mimo2(tbl->lq_type)) 544 rate_n_flags |= iwl_rates[index].plcp_mimo2; 545 else 546 rate_n_flags |= iwl_rates[index].plcp_mimo3; 547 } else { 548 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type); 549 } 550 551 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) & 552 RATE_MCS_ANT_ABC_MSK); 553 554 if (is_Ht(tbl->lq_type)) { 555 if (tbl->is_ht40) { 556 if (tbl->is_dup) 557 rate_n_flags |= RATE_MCS_DUP_MSK; 558 else 559 rate_n_flags |= RATE_MCS_HT40_MSK; 560 } 561 if (tbl->is_SGI) 562 rate_n_flags |= RATE_MCS_SGI_MSK; 563 564 if (use_green) { 565 rate_n_flags |= RATE_MCS_GF_MSK; 566 if (is_siso(tbl->lq_type) && tbl->is_SGI) { 567 rate_n_flags &= ~RATE_MCS_SGI_MSK; 568 IWL_ERR(priv, "GF was set with SGI:SISO\n"); 569 } 570 } 571 } 572 return rate_n_flags; 573 } 574 575 /* 576 * Interpret uCode API's rate_n_flags format, 577 * fill "search" or "active" tx mode table. 578 */ 579 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags, 580 enum nl80211_band band, 581 struct iwl_scale_tbl_info *tbl, 582 int *rate_idx) 583 { 584 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK); 585 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags); 586 u8 mcs; 587 588 memset(tbl, 0, sizeof(struct iwl_scale_tbl_info)); 589 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags); 590 591 if (*rate_idx == IWL_RATE_INVALID) { 592 *rate_idx = -1; 593 return -EINVAL; 594 } 595 tbl->is_SGI = 0; /* default legacy setup */ 596 tbl->is_ht40 = 0; 597 tbl->is_dup = 0; 598 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS); 599 tbl->lq_type = LQ_NONE; 600 tbl->max_search = IWL_MAX_SEARCH; 601 602 /* legacy rate format */ 603 if (!(rate_n_flags & RATE_MCS_HT_MSK)) { 604 if (num_of_ant == 1) { 605 if (band == NL80211_BAND_5GHZ) 606 tbl->lq_type = LQ_A; 607 else 608 tbl->lq_type = LQ_G; 609 } 610 /* HT rate format */ 611 } else { 612 if (rate_n_flags & RATE_MCS_SGI_MSK) 613 tbl->is_SGI = 1; 614 615 if ((rate_n_flags & RATE_MCS_HT40_MSK) || 616 (rate_n_flags & RATE_MCS_DUP_MSK)) 617 tbl->is_ht40 = 1; 618 619 if (rate_n_flags & RATE_MCS_DUP_MSK) 620 tbl->is_dup = 1; 621 622 mcs = rs_extract_rate(rate_n_flags); 623 624 /* SISO */ 625 if (mcs <= IWL_RATE_SISO_60M_PLCP) { 626 if (num_of_ant == 1) 627 tbl->lq_type = LQ_SISO; /*else NONE*/ 628 /* MIMO2 */ 629 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) { 630 if (num_of_ant == 2) 631 tbl->lq_type = LQ_MIMO2; 632 /* MIMO3 */ 633 } else { 634 if (num_of_ant == 3) { 635 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH; 636 tbl->lq_type = LQ_MIMO3; 637 } 638 } 639 } 640 return 0; 641 } 642 643 /* switch to another antenna/antennas and return 1 */ 644 /* if no other valid antenna found, return 0 */ 645 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags, 646 struct iwl_scale_tbl_info *tbl) 647 { 648 u8 new_ant_type; 649 650 if (!tbl->ant_type || tbl->ant_type > ANT_ABC) 651 return 0; 652 653 if (!rs_is_valid_ant(valid_ant, tbl->ant_type)) 654 return 0; 655 656 new_ant_type = ant_toggle_lookup[tbl->ant_type]; 657 658 while ((new_ant_type != tbl->ant_type) && 659 !rs_is_valid_ant(valid_ant, new_ant_type)) 660 new_ant_type = ant_toggle_lookup[new_ant_type]; 661 662 if (new_ant_type == tbl->ant_type) 663 return 0; 664 665 tbl->ant_type = new_ant_type; 666 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK; 667 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS; 668 return 1; 669 } 670 671 /* 672 * Green-field mode is valid if the station supports it and 673 * there are no non-GF stations present in the BSS. 674 */ 675 static bool rs_use_green(struct ieee80211_sta *sta) 676 { 677 /* 678 * There's a bug somewhere in this code that causes the 679 * scaling to get stuck because GF+SGI can't be combined 680 * in SISO rates. Until we find that bug, disable GF, it 681 * has only limited benefit and we still interoperate with 682 * GF APs since we can always receive GF transmissions. 683 */ 684 return false; 685 } 686 687 /* 688 * rs_get_supported_rates - get the available rates 689 * 690 * if management frame or broadcast frame only return 691 * basic available rates. 692 * 693 */ 694 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta, 695 struct ieee80211_hdr *hdr, 696 enum iwl_table_type rate_type) 697 { 698 if (is_legacy(rate_type)) { 699 return lq_sta->active_legacy_rate; 700 } else { 701 if (is_siso(rate_type)) 702 return lq_sta->active_siso_rate; 703 else if (is_mimo2(rate_type)) 704 return lq_sta->active_mimo2_rate; 705 else 706 return lq_sta->active_mimo3_rate; 707 } 708 } 709 710 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask, 711 int rate_type) 712 { 713 u8 high = IWL_RATE_INVALID; 714 u8 low = IWL_RATE_INVALID; 715 716 /* 802.11A or ht walks to the next literal adjacent rate in 717 * the rate table */ 718 if (is_a_band(rate_type) || !is_legacy(rate_type)) { 719 int i; 720 u32 mask; 721 722 /* Find the previous rate that is in the rate mask */ 723 i = index - 1; 724 if (i >= 0) 725 mask = BIT(i); 726 727 for (; i >= 0; i--, mask >>= 1) { 728 if (rate_mask & mask) { 729 low = i; 730 break; 731 } 732 } 733 734 /* Find the next rate that is in the rate mask */ 735 i = index + 1; 736 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) { 737 if (rate_mask & mask) { 738 high = i; 739 break; 740 } 741 } 742 743 return (high << 8) | low; 744 } 745 746 low = index; 747 while (low != IWL_RATE_INVALID) { 748 low = iwl_rates[low].prev_rs; 749 if (low == IWL_RATE_INVALID) 750 break; 751 if (rate_mask & (1 << low)) 752 break; 753 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low); 754 } 755 756 high = index; 757 while (high != IWL_RATE_INVALID) { 758 high = iwl_rates[high].next_rs; 759 if (high == IWL_RATE_INVALID) 760 break; 761 if (rate_mask & (1 << high)) 762 break; 763 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high); 764 } 765 766 return (high << 8) | low; 767 } 768 769 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta, 770 struct iwl_scale_tbl_info *tbl, 771 u8 scale_index, u8 ht_possible) 772 { 773 s32 low; 774 u16 rate_mask; 775 u16 high_low; 776 u8 switch_to_legacy = 0; 777 u8 is_green = lq_sta->is_green; 778 struct iwl_priv *priv = lq_sta->drv; 779 780 /* check if we need to switch from HT to legacy rates. 781 * assumption is that mandatory rates (1Mbps or 6Mbps) 782 * are always supported (spec demand) */ 783 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) { 784 switch_to_legacy = 1; 785 scale_index = rs_ht_to_legacy[scale_index]; 786 if (lq_sta->band == NL80211_BAND_5GHZ) 787 tbl->lq_type = LQ_A; 788 else 789 tbl->lq_type = LQ_G; 790 791 if (num_of_ant(tbl->ant_type) > 1) 792 tbl->ant_type = 793 first_antenna(priv->nvm_data->valid_tx_ant); 794 795 tbl->is_ht40 = 0; 796 tbl->is_SGI = 0; 797 tbl->max_search = IWL_MAX_SEARCH; 798 } 799 800 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type); 801 802 /* Mask with station rate restriction */ 803 if (is_legacy(tbl->lq_type)) { 804 /* supp_rates has no CCK bits in A mode */ 805 if (lq_sta->band == NL80211_BAND_5GHZ) 806 rate_mask = (u16)(rate_mask & 807 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE)); 808 else 809 rate_mask = (u16)(rate_mask & lq_sta->supp_rates); 810 } 811 812 /* If we switched from HT to legacy, check current rate */ 813 if (switch_to_legacy && (rate_mask & (1 << scale_index))) { 814 low = scale_index; 815 goto out; 816 } 817 818 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask, 819 tbl->lq_type); 820 low = high_low & 0xff; 821 822 if (low == IWL_RATE_INVALID) 823 low = scale_index; 824 825 out: 826 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green); 827 } 828 829 /* 830 * Simple function to compare two rate scale table types 831 */ 832 static bool table_type_matches(struct iwl_scale_tbl_info *a, 833 struct iwl_scale_tbl_info *b) 834 { 835 return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) && 836 (a->is_SGI == b->is_SGI); 837 } 838 839 static void rs_bt_update_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx, 840 struct iwl_lq_sta *lq_sta) 841 { 842 struct iwl_scale_tbl_info *tbl; 843 bool full_concurrent = priv->bt_full_concurrent; 844 845 if ((priv->bt_traffic_load != priv->last_bt_traffic_load) || 846 (priv->bt_full_concurrent != full_concurrent)) { 847 priv->bt_full_concurrent = full_concurrent; 848 priv->last_bt_traffic_load = priv->bt_traffic_load; 849 850 /* Update uCode's rate table. */ 851 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 852 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate); 853 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false); 854 855 queue_work(priv->workqueue, &priv->bt_full_concurrency); 856 } 857 } 858 859 /* 860 * mac80211 sends us Tx status 861 */ 862 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband, 863 struct ieee80211_sta *sta, void *priv_sta, 864 struct sk_buff *skb) 865 { 866 int legacy_success; 867 int retries; 868 int rs_index, mac_index, i; 869 struct iwl_lq_sta *lq_sta = priv_sta; 870 struct iwl_link_quality_cmd *table; 871 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 872 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)priv_r; 873 struct iwl_priv *priv = IWL_OP_MODE_GET_DVM(op_mode); 874 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 875 enum mac80211_rate_control_flags mac_flags; 876 u32 tx_rate; 877 struct iwl_scale_tbl_info tbl_type; 878 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl; 879 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv; 880 struct iwl_rxon_context *ctx = sta_priv->ctx; 881 882 IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n"); 883 884 /* Treat uninitialized rate scaling data same as non-existing. */ 885 if (!lq_sta) { 886 IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n"); 887 return; 888 } else if (!lq_sta->drv) { 889 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n"); 890 return; 891 } 892 893 if (!ieee80211_is_data(hdr->frame_control) || 894 info->flags & IEEE80211_TX_CTL_NO_ACK) 895 return; 896 897 /* This packet was aggregated but doesn't carry status info */ 898 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 899 !(info->flags & IEEE80211_TX_STAT_AMPDU)) 900 return; 901 902 /* 903 * Ignore this Tx frame response if its initial rate doesn't match 904 * that of latest Link Quality command. There may be stragglers 905 * from a previous Link Quality command, but we're no longer interested 906 * in those; they're either from the "active" mode while we're trying 907 * to check "search" mode, or a prior "search" mode after we've moved 908 * to a new "search" mode (which might become the new "active" mode). 909 */ 910 table = &lq_sta->lq; 911 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags); 912 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index); 913 if (priv->band == NL80211_BAND_5GHZ) 914 rs_index -= IWL_FIRST_OFDM_RATE; 915 mac_flags = info->status.rates[0].flags; 916 mac_index = info->status.rates[0].idx; 917 /* For HT packets, map MCS to PLCP */ 918 if (mac_flags & IEEE80211_TX_RC_MCS) { 919 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */ 920 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE)) 921 mac_index++; 922 /* 923 * mac80211 HT index is always zero-indexed; we need to move 924 * HT OFDM rates after CCK rates in 2.4 GHz band 925 */ 926 if (priv->band == NL80211_BAND_2GHZ) 927 mac_index += IWL_FIRST_OFDM_RATE; 928 } 929 /* Here we actually compare this rate to the latest LQ command */ 930 if ((mac_index < 0) || 931 (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) || 932 (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) || 933 (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) || 934 (tbl_type.ant_type != info->status.antenna) || 935 (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) || 936 (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) || 937 (rs_index != mac_index)) { 938 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate); 939 /* 940 * Since rates mis-match, the last LQ command may have failed. 941 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with 942 * ... driver. 943 */ 944 lq_sta->missed_rate_counter++; 945 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) { 946 lq_sta->missed_rate_counter = 0; 947 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false); 948 } 949 /* Regardless, ignore this status info for outdated rate */ 950 return; 951 } else 952 /* Rate did match, so reset the missed_rate_counter */ 953 lq_sta->missed_rate_counter = 0; 954 955 /* Figure out if rate scale algorithm is in active or search table */ 956 if (table_type_matches(&tbl_type, 957 &(lq_sta->lq_info[lq_sta->active_tbl]))) { 958 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 959 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 960 } else if (table_type_matches(&tbl_type, 961 &lq_sta->lq_info[1 - lq_sta->active_tbl])) { 962 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 963 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 964 } else { 965 IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n"); 966 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 967 IWL_DEBUG_RATE(priv, "active- lq:%x, ant:%x, SGI:%d\n", 968 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI); 969 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 970 IWL_DEBUG_RATE(priv, "search- lq:%x, ant:%x, SGI:%d\n", 971 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI); 972 IWL_DEBUG_RATE(priv, "actual- lq:%x, ant:%x, SGI:%d\n", 973 tbl_type.lq_type, tbl_type.ant_type, tbl_type.is_SGI); 974 /* 975 * no matching table found, let's by-pass the data collection 976 * and continue to perform rate scale to find the rate table 977 */ 978 rs_stay_in_table(lq_sta, true); 979 goto done; 980 } 981 982 /* 983 * Updating the frame history depends on whether packets were 984 * aggregated. 985 * 986 * For aggregation, all packets were transmitted at the same rate, the 987 * first index into rate scale table. 988 */ 989 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 990 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags); 991 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, 992 &rs_index); 993 rs_collect_tx_data(curr_tbl, rs_index, 994 info->status.ampdu_len, 995 info->status.ampdu_ack_len); 996 997 /* Update success/fail counts if not searching for new mode */ 998 if (lq_sta->stay_in_tbl) { 999 lq_sta->total_success += info->status.ampdu_ack_len; 1000 lq_sta->total_failed += (info->status.ampdu_len - 1001 info->status.ampdu_ack_len); 1002 } 1003 } else { 1004 /* 1005 * For legacy, update frame history with for each Tx retry. 1006 */ 1007 retries = info->status.rates[0].count - 1; 1008 /* HW doesn't send more than 15 retries */ 1009 retries = min(retries, 15); 1010 1011 /* The last transmission may have been successful */ 1012 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK); 1013 /* Collect data for each rate used during failed TX attempts */ 1014 for (i = 0; i <= retries; ++i) { 1015 tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags); 1016 rs_get_tbl_info_from_mcs(tx_rate, priv->band, 1017 &tbl_type, &rs_index); 1018 /* 1019 * Only collect stats if retried rate is in the same RS 1020 * table as active/search. 1021 */ 1022 if (table_type_matches(&tbl_type, curr_tbl)) 1023 tmp_tbl = curr_tbl; 1024 else if (table_type_matches(&tbl_type, other_tbl)) 1025 tmp_tbl = other_tbl; 1026 else 1027 continue; 1028 rs_collect_tx_data(tmp_tbl, rs_index, 1, 1029 i < retries ? 0 : legacy_success); 1030 } 1031 1032 /* Update success/fail counts if not searching for new mode */ 1033 if (lq_sta->stay_in_tbl) { 1034 lq_sta->total_success += legacy_success; 1035 lq_sta->total_failed += retries + (1 - legacy_success); 1036 } 1037 } 1038 /* The last TX rate is cached in lq_sta; it's set in if/else above */ 1039 lq_sta->last_rate_n_flags = tx_rate; 1040 done: 1041 /* See if there's a better rate or modulation mode to try. */ 1042 if (sta && sta->deflink.supp_rates[sband->band]) 1043 rs_rate_scale_perform(priv, skb, sta, lq_sta); 1044 1045 if (priv->lib->bt_params && priv->lib->bt_params->advanced_bt_coexist) 1046 rs_bt_update_lq(priv, ctx, lq_sta); 1047 } 1048 1049 /* 1050 * Begin a period of staying with a selected modulation mode. 1051 * Set "stay_in_tbl" flag to prevent any mode switches. 1052 * Set frame tx success limits according to legacy vs. high-throughput, 1053 * and reset overall (spanning all rates) tx success history statistics. 1054 * These control how long we stay using same modulation mode before 1055 * searching for a new mode. 1056 */ 1057 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy, 1058 struct iwl_lq_sta *lq_sta) 1059 { 1060 IWL_DEBUG_RATE(priv, "we are staying in the same table\n"); 1061 lq_sta->stay_in_tbl = 1; /* only place this gets set */ 1062 if (is_legacy) { 1063 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT; 1064 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT; 1065 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT; 1066 } else { 1067 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT; 1068 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT; 1069 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT; 1070 } 1071 lq_sta->table_count = 0; 1072 lq_sta->total_failed = 0; 1073 lq_sta->total_success = 0; 1074 lq_sta->flush_timer = jiffies; 1075 lq_sta->action_counter = 0; 1076 } 1077 1078 /* 1079 * Find correct throughput table for given mode of modulation 1080 */ 1081 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1082 struct iwl_scale_tbl_info *tbl) 1083 { 1084 /* Used to choose among HT tables */ 1085 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT]; 1086 1087 /* Check for invalid LQ type */ 1088 if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) { 1089 tbl->expected_tpt = expected_tpt_legacy; 1090 return; 1091 } 1092 1093 /* Legacy rates have only one table */ 1094 if (is_legacy(tbl->lq_type)) { 1095 tbl->expected_tpt = expected_tpt_legacy; 1096 return; 1097 } 1098 1099 /* Choose among many HT tables depending on number of streams 1100 * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation 1101 * status */ 1102 if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup)) 1103 ht_tbl_pointer = expected_tpt_siso20MHz; 1104 else if (is_siso(tbl->lq_type)) 1105 ht_tbl_pointer = expected_tpt_siso40MHz; 1106 else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup)) 1107 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1108 else if (is_mimo2(tbl->lq_type)) 1109 ht_tbl_pointer = expected_tpt_mimo2_40MHz; 1110 else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup)) 1111 ht_tbl_pointer = expected_tpt_mimo3_20MHz; 1112 else /* if (is_mimo3(tbl->lq_type)) <-- must be true */ 1113 ht_tbl_pointer = expected_tpt_mimo3_40MHz; 1114 1115 if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */ 1116 tbl->expected_tpt = ht_tbl_pointer[0]; 1117 else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */ 1118 tbl->expected_tpt = ht_tbl_pointer[1]; 1119 else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */ 1120 tbl->expected_tpt = ht_tbl_pointer[2]; 1121 else /* AGG+SGI */ 1122 tbl->expected_tpt = ht_tbl_pointer[3]; 1123 } 1124 1125 /* 1126 * Find starting rate for new "search" high-throughput mode of modulation. 1127 * Goal is to find lowest expected rate (under perfect conditions) that is 1128 * above the current measured throughput of "active" mode, to give new mode 1129 * a fair chance to prove itself without too many challenges. 1130 * 1131 * This gets called when transitioning to more aggressive modulation 1132 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive 1133 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need 1134 * to decrease to match "active" throughput. When moving from MIMO to SISO, 1135 * bit rate will typically need to increase, but not if performance was bad. 1136 */ 1137 static s32 rs_get_best_rate(struct iwl_priv *priv, 1138 struct iwl_lq_sta *lq_sta, 1139 struct iwl_scale_tbl_info *tbl, /* "search" */ 1140 u16 rate_mask, s8 index) 1141 { 1142 /* "active" values */ 1143 struct iwl_scale_tbl_info *active_tbl = 1144 &(lq_sta->lq_info[lq_sta->active_tbl]); 1145 s32 active_sr = active_tbl->win[index].success_ratio; 1146 s32 active_tpt = active_tbl->expected_tpt[index]; 1147 /* expected "search" throughput */ 1148 const u16 *tpt_tbl = tbl->expected_tpt; 1149 1150 s32 new_rate, high, low, start_hi; 1151 u16 high_low; 1152 s8 rate = index; 1153 1154 new_rate = high = low = start_hi = IWL_RATE_INVALID; 1155 1156 for (; ;) { 1157 high_low = rs_get_adjacent_rate(priv, rate, rate_mask, 1158 tbl->lq_type); 1159 1160 low = high_low & 0xff; 1161 high = (high_low >> 8) & 0xff; 1162 1163 /* 1164 * Lower the "search" bit rate, to give new "search" mode 1165 * approximately the same throughput as "active" if: 1166 * 1167 * 1) "Active" mode has been working modestly well (but not 1168 * great), and expected "search" throughput (under perfect 1169 * conditions) at candidate rate is above the actual 1170 * measured "active" throughput (but less than expected 1171 * "active" throughput under perfect conditions). 1172 * OR 1173 * 2) "Active" mode has been working perfectly or very well 1174 * and expected "search" throughput (under perfect 1175 * conditions) at candidate rate is above expected 1176 * "active" throughput (under perfect conditions). 1177 */ 1178 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) && 1179 ((active_sr > IWL_RATE_DECREASE_TH) && 1180 (active_sr <= IWL_RATE_HIGH_TH) && 1181 (tpt_tbl[rate] <= active_tpt))) || 1182 ((active_sr >= IWL_RATE_SCALE_SWITCH) && 1183 (tpt_tbl[rate] > active_tpt))) { 1184 1185 /* (2nd or later pass) 1186 * If we've already tried to raise the rate, and are 1187 * now trying to lower it, use the higher rate. */ 1188 if (start_hi != IWL_RATE_INVALID) { 1189 new_rate = start_hi; 1190 break; 1191 } 1192 1193 new_rate = rate; 1194 1195 /* Loop again with lower rate */ 1196 if (low != IWL_RATE_INVALID) 1197 rate = low; 1198 1199 /* Lower rate not available, use the original */ 1200 else 1201 break; 1202 1203 /* Else try to raise the "search" rate to match "active" */ 1204 } else { 1205 /* (2nd or later pass) 1206 * If we've already tried to lower the rate, and are 1207 * now trying to raise it, use the lower rate. */ 1208 if (new_rate != IWL_RATE_INVALID) 1209 break; 1210 1211 /* Loop again with higher rate */ 1212 else if (high != IWL_RATE_INVALID) { 1213 start_hi = high; 1214 rate = high; 1215 1216 /* Higher rate not available, use the original */ 1217 } else { 1218 new_rate = rate; 1219 break; 1220 } 1221 } 1222 } 1223 1224 return new_rate; 1225 } 1226 1227 /* 1228 * Set up search table for MIMO2 1229 */ 1230 static int rs_switch_to_mimo2(struct iwl_priv *priv, 1231 struct iwl_lq_sta *lq_sta, 1232 struct ieee80211_conf *conf, 1233 struct ieee80211_sta *sta, 1234 struct iwl_scale_tbl_info *tbl, int index) 1235 { 1236 u16 rate_mask; 1237 s32 rate; 1238 s8 is_green = lq_sta->is_green; 1239 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv; 1240 struct iwl_rxon_context *ctx = sta_priv->ctx; 1241 1242 if (!conf_is_ht(conf) || !sta->deflink.ht_cap.ht_supported) 1243 return -1; 1244 1245 if (sta->deflink.smps_mode == IEEE80211_SMPS_STATIC) 1246 return -1; 1247 1248 /* Need both Tx chains/antennas to support MIMO */ 1249 if (priv->hw_params.tx_chains_num < 2) 1250 return -1; 1251 1252 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n"); 1253 1254 tbl->lq_type = LQ_MIMO2; 1255 tbl->is_dup = lq_sta->is_dup; 1256 tbl->action = 0; 1257 tbl->max_search = IWL_MAX_SEARCH; 1258 rate_mask = lq_sta->active_mimo2_rate; 1259 1260 if (iwl_is_ht40_tx_allowed(priv, ctx, sta)) 1261 tbl->is_ht40 = 1; 1262 else 1263 tbl->is_ht40 = 0; 1264 1265 rs_set_expected_tpt_table(lq_sta, tbl); 1266 1267 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index); 1268 1269 IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask); 1270 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) { 1271 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n", 1272 rate, rate_mask); 1273 return -1; 1274 } 1275 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green); 1276 1277 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n", 1278 tbl->current_rate, is_green); 1279 return 0; 1280 } 1281 1282 /* 1283 * Set up search table for MIMO3 1284 */ 1285 static int rs_switch_to_mimo3(struct iwl_priv *priv, 1286 struct iwl_lq_sta *lq_sta, 1287 struct ieee80211_conf *conf, 1288 struct ieee80211_sta *sta, 1289 struct iwl_scale_tbl_info *tbl, int index) 1290 { 1291 u16 rate_mask; 1292 s32 rate; 1293 s8 is_green = lq_sta->is_green; 1294 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv; 1295 struct iwl_rxon_context *ctx = sta_priv->ctx; 1296 1297 if (!conf_is_ht(conf) || !sta->deflink.ht_cap.ht_supported) 1298 return -1; 1299 1300 if (sta->deflink.smps_mode == IEEE80211_SMPS_STATIC) 1301 return -1; 1302 1303 /* Need both Tx chains/antennas to support MIMO */ 1304 if (priv->hw_params.tx_chains_num < 3) 1305 return -1; 1306 1307 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n"); 1308 1309 tbl->lq_type = LQ_MIMO3; 1310 tbl->is_dup = lq_sta->is_dup; 1311 tbl->action = 0; 1312 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH; 1313 rate_mask = lq_sta->active_mimo3_rate; 1314 1315 if (iwl_is_ht40_tx_allowed(priv, ctx, sta)) 1316 tbl->is_ht40 = 1; 1317 else 1318 tbl->is_ht40 = 0; 1319 1320 rs_set_expected_tpt_table(lq_sta, tbl); 1321 1322 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index); 1323 1324 IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n", 1325 rate, rate_mask); 1326 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) { 1327 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n", 1328 rate, rate_mask); 1329 return -1; 1330 } 1331 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green); 1332 1333 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n", 1334 tbl->current_rate, is_green); 1335 return 0; 1336 } 1337 1338 /* 1339 * Set up search table for SISO 1340 */ 1341 static int rs_switch_to_siso(struct iwl_priv *priv, 1342 struct iwl_lq_sta *lq_sta, 1343 struct ieee80211_conf *conf, 1344 struct ieee80211_sta *sta, 1345 struct iwl_scale_tbl_info *tbl, int index) 1346 { 1347 u16 rate_mask; 1348 u8 is_green = lq_sta->is_green; 1349 s32 rate; 1350 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv; 1351 struct iwl_rxon_context *ctx = sta_priv->ctx; 1352 1353 if (!conf_is_ht(conf) || !sta->deflink.ht_cap.ht_supported) 1354 return -1; 1355 1356 IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n"); 1357 1358 tbl->is_dup = lq_sta->is_dup; 1359 tbl->lq_type = LQ_SISO; 1360 tbl->action = 0; 1361 tbl->max_search = IWL_MAX_SEARCH; 1362 rate_mask = lq_sta->active_siso_rate; 1363 1364 if (iwl_is_ht40_tx_allowed(priv, ctx, sta)) 1365 tbl->is_ht40 = 1; 1366 else 1367 tbl->is_ht40 = 0; 1368 1369 if (is_green) 1370 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/ 1371 1372 rs_set_expected_tpt_table(lq_sta, tbl); 1373 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index); 1374 1375 IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask); 1376 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) { 1377 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n", 1378 rate, rate_mask); 1379 return -1; 1380 } 1381 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green); 1382 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n", 1383 tbl->current_rate, is_green); 1384 return 0; 1385 } 1386 1387 /* 1388 * Try to switch to new modulation mode from legacy 1389 */ 1390 static void rs_move_legacy_other(struct iwl_priv *priv, 1391 struct iwl_lq_sta *lq_sta, 1392 struct ieee80211_conf *conf, 1393 struct ieee80211_sta *sta, 1394 int index) 1395 { 1396 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1397 struct iwl_scale_tbl_info *search_tbl = 1398 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 1399 struct iwl_rate_scale_data *window = &(tbl->win[index]); 1400 u32 sz = (sizeof(struct iwl_scale_tbl_info) - 1401 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); 1402 u8 start_action; 1403 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant; 1404 u8 tx_chains_num = priv->hw_params.tx_chains_num; 1405 int ret = 0; 1406 u8 update_search_tbl_counter = 0; 1407 1408 switch (priv->bt_traffic_load) { 1409 case IWL_BT_COEX_TRAFFIC_LOAD_NONE: 1410 /* nothing */ 1411 break; 1412 case IWL_BT_COEX_TRAFFIC_LOAD_LOW: 1413 /* avoid antenna B unless MIMO */ 1414 if (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2) 1415 tbl->action = IWL_LEGACY_SWITCH_SISO; 1416 break; 1417 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH: 1418 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS: 1419 /* avoid antenna B and MIMO */ 1420 valid_tx_ant = 1421 first_antenna(priv->nvm_data->valid_tx_ant); 1422 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2 && 1423 tbl->action != IWL_LEGACY_SWITCH_SISO) 1424 tbl->action = IWL_LEGACY_SWITCH_SISO; 1425 break; 1426 default: 1427 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load); 1428 break; 1429 } 1430 1431 if (!iwl_ht_enabled(priv)) 1432 /* stay in Legacy */ 1433 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1; 1434 else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE && 1435 tbl->action > IWL_LEGACY_SWITCH_SISO) 1436 tbl->action = IWL_LEGACY_SWITCH_SISO; 1437 1438 /* configure as 1x1 if bt full concurrency */ 1439 if (priv->bt_full_concurrent) { 1440 if (!iwl_ht_enabled(priv)) 1441 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1; 1442 else if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2) 1443 tbl->action = IWL_LEGACY_SWITCH_SISO; 1444 valid_tx_ant = 1445 first_antenna(priv->nvm_data->valid_tx_ant); 1446 } 1447 1448 start_action = tbl->action; 1449 for (; ;) { 1450 lq_sta->action_counter++; 1451 switch (tbl->action) { 1452 case IWL_LEGACY_SWITCH_ANTENNA1: 1453 case IWL_LEGACY_SWITCH_ANTENNA2: 1454 IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n"); 1455 1456 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 && 1457 tx_chains_num <= 1) || 1458 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 && 1459 tx_chains_num <= 2)) 1460 break; 1461 1462 /* Don't change antenna if success has been great */ 1463 if (window->success_ratio >= IWL_RS_GOOD_RATIO && 1464 !priv->bt_full_concurrent && 1465 priv->bt_traffic_load == 1466 IWL_BT_COEX_TRAFFIC_LOAD_NONE) 1467 break; 1468 1469 /* Set up search table to try other antenna */ 1470 memcpy(search_tbl, tbl, sz); 1471 1472 if (rs_toggle_antenna(valid_tx_ant, 1473 &search_tbl->current_rate, search_tbl)) { 1474 update_search_tbl_counter = 1; 1475 rs_set_expected_tpt_table(lq_sta, search_tbl); 1476 goto out; 1477 } 1478 break; 1479 case IWL_LEGACY_SWITCH_SISO: 1480 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n"); 1481 1482 /* Set up search table to try SISO */ 1483 memcpy(search_tbl, tbl, sz); 1484 search_tbl->is_SGI = 0; 1485 ret = rs_switch_to_siso(priv, lq_sta, conf, sta, 1486 search_tbl, index); 1487 if (!ret) { 1488 lq_sta->action_counter = 0; 1489 goto out; 1490 } 1491 1492 break; 1493 case IWL_LEGACY_SWITCH_MIMO2_AB: 1494 case IWL_LEGACY_SWITCH_MIMO2_AC: 1495 case IWL_LEGACY_SWITCH_MIMO2_BC: 1496 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n"); 1497 1498 /* Set up search table to try MIMO */ 1499 memcpy(search_tbl, tbl, sz); 1500 search_tbl->is_SGI = 0; 1501 1502 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB) 1503 search_tbl->ant_type = ANT_AB; 1504 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC) 1505 search_tbl->ant_type = ANT_AC; 1506 else 1507 search_tbl->ant_type = ANT_BC; 1508 1509 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 1510 break; 1511 1512 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta, 1513 search_tbl, index); 1514 if (!ret) { 1515 lq_sta->action_counter = 0; 1516 goto out; 1517 } 1518 break; 1519 1520 case IWL_LEGACY_SWITCH_MIMO3_ABC: 1521 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n"); 1522 1523 /* Set up search table to try MIMO3 */ 1524 memcpy(search_tbl, tbl, sz); 1525 search_tbl->is_SGI = 0; 1526 1527 search_tbl->ant_type = ANT_ABC; 1528 1529 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 1530 break; 1531 1532 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta, 1533 search_tbl, index); 1534 if (!ret) { 1535 lq_sta->action_counter = 0; 1536 goto out; 1537 } 1538 break; 1539 } 1540 tbl->action++; 1541 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC) 1542 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1; 1543 1544 if (tbl->action == start_action) 1545 break; 1546 1547 } 1548 search_tbl->lq_type = LQ_NONE; 1549 return; 1550 1551 out: 1552 lq_sta->search_better_tbl = 1; 1553 tbl->action++; 1554 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC) 1555 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1; 1556 if (update_search_tbl_counter) 1557 search_tbl->action = tbl->action; 1558 } 1559 1560 /* 1561 * Try to switch to new modulation mode from SISO 1562 */ 1563 static void rs_move_siso_to_other(struct iwl_priv *priv, 1564 struct iwl_lq_sta *lq_sta, 1565 struct ieee80211_conf *conf, 1566 struct ieee80211_sta *sta, int index) 1567 { 1568 u8 is_green = lq_sta->is_green; 1569 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1570 struct iwl_scale_tbl_info *search_tbl = 1571 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 1572 struct iwl_rate_scale_data *window = &(tbl->win[index]); 1573 struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap; 1574 u32 sz = (sizeof(struct iwl_scale_tbl_info) - 1575 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); 1576 u8 start_action; 1577 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant; 1578 u8 tx_chains_num = priv->hw_params.tx_chains_num; 1579 u8 update_search_tbl_counter = 0; 1580 int ret; 1581 1582 switch (priv->bt_traffic_load) { 1583 case IWL_BT_COEX_TRAFFIC_LOAD_NONE: 1584 /* nothing */ 1585 break; 1586 case IWL_BT_COEX_TRAFFIC_LOAD_LOW: 1587 /* avoid antenna B unless MIMO */ 1588 if (tbl->action == IWL_SISO_SWITCH_ANTENNA2) 1589 tbl->action = IWL_SISO_SWITCH_MIMO2_AB; 1590 break; 1591 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH: 1592 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS: 1593 /* avoid antenna B and MIMO */ 1594 valid_tx_ant = 1595 first_antenna(priv->nvm_data->valid_tx_ant); 1596 if (tbl->action != IWL_SISO_SWITCH_ANTENNA1) 1597 tbl->action = IWL_SISO_SWITCH_ANTENNA1; 1598 break; 1599 default: 1600 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load); 1601 break; 1602 } 1603 1604 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE && 1605 tbl->action > IWL_SISO_SWITCH_ANTENNA2) { 1606 /* stay in SISO */ 1607 tbl->action = IWL_SISO_SWITCH_ANTENNA1; 1608 } 1609 1610 /* configure as 1x1 if bt full concurrency */ 1611 if (priv->bt_full_concurrent) { 1612 valid_tx_ant = 1613 first_antenna(priv->nvm_data->valid_tx_ant); 1614 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2) 1615 tbl->action = IWL_SISO_SWITCH_ANTENNA1; 1616 } 1617 1618 start_action = tbl->action; 1619 for (;;) { 1620 lq_sta->action_counter++; 1621 switch (tbl->action) { 1622 case IWL_SISO_SWITCH_ANTENNA1: 1623 case IWL_SISO_SWITCH_ANTENNA2: 1624 IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n"); 1625 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 && 1626 tx_chains_num <= 1) || 1627 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 && 1628 tx_chains_num <= 2)) 1629 break; 1630 1631 if (window->success_ratio >= IWL_RS_GOOD_RATIO && 1632 !priv->bt_full_concurrent && 1633 priv->bt_traffic_load == 1634 IWL_BT_COEX_TRAFFIC_LOAD_NONE) 1635 break; 1636 1637 memcpy(search_tbl, tbl, sz); 1638 if (rs_toggle_antenna(valid_tx_ant, 1639 &search_tbl->current_rate, search_tbl)) { 1640 update_search_tbl_counter = 1; 1641 goto out; 1642 } 1643 break; 1644 case IWL_SISO_SWITCH_MIMO2_AB: 1645 case IWL_SISO_SWITCH_MIMO2_AC: 1646 case IWL_SISO_SWITCH_MIMO2_BC: 1647 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n"); 1648 memcpy(search_tbl, tbl, sz); 1649 search_tbl->is_SGI = 0; 1650 1651 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB) 1652 search_tbl->ant_type = ANT_AB; 1653 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC) 1654 search_tbl->ant_type = ANT_AC; 1655 else 1656 search_tbl->ant_type = ANT_BC; 1657 1658 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 1659 break; 1660 1661 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta, 1662 search_tbl, index); 1663 if (!ret) 1664 goto out; 1665 break; 1666 case IWL_SISO_SWITCH_GI: 1667 if (!tbl->is_ht40 && !(ht_cap->cap & 1668 IEEE80211_HT_CAP_SGI_20)) 1669 break; 1670 if (tbl->is_ht40 && !(ht_cap->cap & 1671 IEEE80211_HT_CAP_SGI_40)) 1672 break; 1673 1674 IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n"); 1675 1676 memcpy(search_tbl, tbl, sz); 1677 if (is_green) { 1678 if (!tbl->is_SGI) 1679 break; 1680 else 1681 IWL_ERR(priv, 1682 "SGI was set in GF+SISO\n"); 1683 } 1684 search_tbl->is_SGI = !tbl->is_SGI; 1685 rs_set_expected_tpt_table(lq_sta, search_tbl); 1686 if (tbl->is_SGI) { 1687 s32 tpt = lq_sta->last_tpt / 100; 1688 if (tpt >= search_tbl->expected_tpt[index]) 1689 break; 1690 } 1691 search_tbl->current_rate = 1692 rate_n_flags_from_tbl(priv, search_tbl, 1693 index, is_green); 1694 update_search_tbl_counter = 1; 1695 goto out; 1696 case IWL_SISO_SWITCH_MIMO3_ABC: 1697 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n"); 1698 memcpy(search_tbl, tbl, sz); 1699 search_tbl->is_SGI = 0; 1700 search_tbl->ant_type = ANT_ABC; 1701 1702 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 1703 break; 1704 1705 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta, 1706 search_tbl, index); 1707 if (!ret) 1708 goto out; 1709 break; 1710 } 1711 tbl->action++; 1712 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC) 1713 tbl->action = IWL_SISO_SWITCH_ANTENNA1; 1714 1715 if (tbl->action == start_action) 1716 break; 1717 } 1718 search_tbl->lq_type = LQ_NONE; 1719 return; 1720 1721 out: 1722 lq_sta->search_better_tbl = 1; 1723 tbl->action++; 1724 if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC) 1725 tbl->action = IWL_SISO_SWITCH_ANTENNA1; 1726 if (update_search_tbl_counter) 1727 search_tbl->action = tbl->action; 1728 } 1729 1730 /* 1731 * Try to switch to new modulation mode from MIMO2 1732 */ 1733 static void rs_move_mimo2_to_other(struct iwl_priv *priv, 1734 struct iwl_lq_sta *lq_sta, 1735 struct ieee80211_conf *conf, 1736 struct ieee80211_sta *sta, int index) 1737 { 1738 s8 is_green = lq_sta->is_green; 1739 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1740 struct iwl_scale_tbl_info *search_tbl = 1741 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 1742 struct iwl_rate_scale_data *window = &(tbl->win[index]); 1743 struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap; 1744 u32 sz = (sizeof(struct iwl_scale_tbl_info) - 1745 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); 1746 u8 start_action; 1747 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant; 1748 u8 tx_chains_num = priv->hw_params.tx_chains_num; 1749 u8 update_search_tbl_counter = 0; 1750 int ret; 1751 1752 switch (priv->bt_traffic_load) { 1753 case IWL_BT_COEX_TRAFFIC_LOAD_NONE: 1754 /* nothing */ 1755 break; 1756 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH: 1757 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS: 1758 /* avoid antenna B and MIMO */ 1759 if (tbl->action != IWL_MIMO2_SWITCH_SISO_A) 1760 tbl->action = IWL_MIMO2_SWITCH_SISO_A; 1761 break; 1762 case IWL_BT_COEX_TRAFFIC_LOAD_LOW: 1763 /* avoid antenna B unless MIMO */ 1764 if (tbl->action == IWL_MIMO2_SWITCH_SISO_B || 1765 tbl->action == IWL_MIMO2_SWITCH_SISO_C) 1766 tbl->action = IWL_MIMO2_SWITCH_SISO_A; 1767 break; 1768 default: 1769 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load); 1770 break; 1771 } 1772 1773 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) && 1774 (tbl->action < IWL_MIMO2_SWITCH_SISO_A || 1775 tbl->action > IWL_MIMO2_SWITCH_SISO_C)) { 1776 /* switch in SISO */ 1777 tbl->action = IWL_MIMO2_SWITCH_SISO_A; 1778 } 1779 1780 /* configure as 1x1 if bt full concurrency */ 1781 if (priv->bt_full_concurrent && 1782 (tbl->action < IWL_MIMO2_SWITCH_SISO_A || 1783 tbl->action > IWL_MIMO2_SWITCH_SISO_C)) 1784 tbl->action = IWL_MIMO2_SWITCH_SISO_A; 1785 1786 start_action = tbl->action; 1787 for (;;) { 1788 lq_sta->action_counter++; 1789 switch (tbl->action) { 1790 case IWL_MIMO2_SWITCH_ANTENNA1: 1791 case IWL_MIMO2_SWITCH_ANTENNA2: 1792 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n"); 1793 1794 if (tx_chains_num <= 2) 1795 break; 1796 1797 if (window->success_ratio >= IWL_RS_GOOD_RATIO) 1798 break; 1799 1800 memcpy(search_tbl, tbl, sz); 1801 if (rs_toggle_antenna(valid_tx_ant, 1802 &search_tbl->current_rate, search_tbl)) { 1803 update_search_tbl_counter = 1; 1804 goto out; 1805 } 1806 break; 1807 case IWL_MIMO2_SWITCH_SISO_A: 1808 case IWL_MIMO2_SWITCH_SISO_B: 1809 case IWL_MIMO2_SWITCH_SISO_C: 1810 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n"); 1811 1812 /* Set up new search table for SISO */ 1813 memcpy(search_tbl, tbl, sz); 1814 1815 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A) 1816 search_tbl->ant_type = ANT_A; 1817 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B) 1818 search_tbl->ant_type = ANT_B; 1819 else 1820 search_tbl->ant_type = ANT_C; 1821 1822 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 1823 break; 1824 1825 ret = rs_switch_to_siso(priv, lq_sta, conf, sta, 1826 search_tbl, index); 1827 if (!ret) 1828 goto out; 1829 1830 break; 1831 1832 case IWL_MIMO2_SWITCH_GI: 1833 if (!tbl->is_ht40 && !(ht_cap->cap & 1834 IEEE80211_HT_CAP_SGI_20)) 1835 break; 1836 if (tbl->is_ht40 && !(ht_cap->cap & 1837 IEEE80211_HT_CAP_SGI_40)) 1838 break; 1839 1840 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n"); 1841 1842 /* Set up new search table for MIMO2 */ 1843 memcpy(search_tbl, tbl, sz); 1844 search_tbl->is_SGI = !tbl->is_SGI; 1845 rs_set_expected_tpt_table(lq_sta, search_tbl); 1846 /* 1847 * If active table already uses the fastest possible 1848 * modulation (dual stream with short guard interval), 1849 * and it's working well, there's no need to look 1850 * for a better type of modulation! 1851 */ 1852 if (tbl->is_SGI) { 1853 s32 tpt = lq_sta->last_tpt / 100; 1854 if (tpt >= search_tbl->expected_tpt[index]) 1855 break; 1856 } 1857 search_tbl->current_rate = 1858 rate_n_flags_from_tbl(priv, search_tbl, 1859 index, is_green); 1860 update_search_tbl_counter = 1; 1861 goto out; 1862 1863 case IWL_MIMO2_SWITCH_MIMO3_ABC: 1864 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n"); 1865 memcpy(search_tbl, tbl, sz); 1866 search_tbl->is_SGI = 0; 1867 search_tbl->ant_type = ANT_ABC; 1868 1869 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 1870 break; 1871 1872 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta, 1873 search_tbl, index); 1874 if (!ret) 1875 goto out; 1876 1877 break; 1878 } 1879 tbl->action++; 1880 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC) 1881 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1; 1882 1883 if (tbl->action == start_action) 1884 break; 1885 } 1886 search_tbl->lq_type = LQ_NONE; 1887 return; 1888 out: 1889 lq_sta->search_better_tbl = 1; 1890 tbl->action++; 1891 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC) 1892 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1; 1893 if (update_search_tbl_counter) 1894 search_tbl->action = tbl->action; 1895 1896 } 1897 1898 /* 1899 * Try to switch to new modulation mode from MIMO3 1900 */ 1901 static void rs_move_mimo3_to_other(struct iwl_priv *priv, 1902 struct iwl_lq_sta *lq_sta, 1903 struct ieee80211_conf *conf, 1904 struct ieee80211_sta *sta, int index) 1905 { 1906 s8 is_green = lq_sta->is_green; 1907 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1908 struct iwl_scale_tbl_info *search_tbl = 1909 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 1910 struct iwl_rate_scale_data *window = &(tbl->win[index]); 1911 struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap; 1912 u32 sz = (sizeof(struct iwl_scale_tbl_info) - 1913 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); 1914 u8 start_action; 1915 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant; 1916 u8 tx_chains_num = priv->hw_params.tx_chains_num; 1917 int ret; 1918 u8 update_search_tbl_counter = 0; 1919 1920 switch (priv->bt_traffic_load) { 1921 case IWL_BT_COEX_TRAFFIC_LOAD_NONE: 1922 /* nothing */ 1923 break; 1924 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH: 1925 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS: 1926 /* avoid antenna B and MIMO */ 1927 if (tbl->action != IWL_MIMO3_SWITCH_SISO_A) 1928 tbl->action = IWL_MIMO3_SWITCH_SISO_A; 1929 break; 1930 case IWL_BT_COEX_TRAFFIC_LOAD_LOW: 1931 /* avoid antenna B unless MIMO */ 1932 if (tbl->action == IWL_MIMO3_SWITCH_SISO_B || 1933 tbl->action == IWL_MIMO3_SWITCH_SISO_C) 1934 tbl->action = IWL_MIMO3_SWITCH_SISO_A; 1935 break; 1936 default: 1937 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load); 1938 break; 1939 } 1940 1941 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) && 1942 (tbl->action < IWL_MIMO3_SWITCH_SISO_A || 1943 tbl->action > IWL_MIMO3_SWITCH_SISO_C)) { 1944 /* switch in SISO */ 1945 tbl->action = IWL_MIMO3_SWITCH_SISO_A; 1946 } 1947 1948 /* configure as 1x1 if bt full concurrency */ 1949 if (priv->bt_full_concurrent && 1950 (tbl->action < IWL_MIMO3_SWITCH_SISO_A || 1951 tbl->action > IWL_MIMO3_SWITCH_SISO_C)) 1952 tbl->action = IWL_MIMO3_SWITCH_SISO_A; 1953 1954 start_action = tbl->action; 1955 for (;;) { 1956 lq_sta->action_counter++; 1957 switch (tbl->action) { 1958 case IWL_MIMO3_SWITCH_ANTENNA1: 1959 case IWL_MIMO3_SWITCH_ANTENNA2: 1960 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n"); 1961 1962 if (tx_chains_num <= 3) 1963 break; 1964 1965 if (window->success_ratio >= IWL_RS_GOOD_RATIO) 1966 break; 1967 1968 memcpy(search_tbl, tbl, sz); 1969 if (rs_toggle_antenna(valid_tx_ant, 1970 &search_tbl->current_rate, search_tbl)) 1971 goto out; 1972 break; 1973 case IWL_MIMO3_SWITCH_SISO_A: 1974 case IWL_MIMO3_SWITCH_SISO_B: 1975 case IWL_MIMO3_SWITCH_SISO_C: 1976 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n"); 1977 1978 /* Set up new search table for SISO */ 1979 memcpy(search_tbl, tbl, sz); 1980 1981 if (tbl->action == IWL_MIMO3_SWITCH_SISO_A) 1982 search_tbl->ant_type = ANT_A; 1983 else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B) 1984 search_tbl->ant_type = ANT_B; 1985 else 1986 search_tbl->ant_type = ANT_C; 1987 1988 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 1989 break; 1990 1991 ret = rs_switch_to_siso(priv, lq_sta, conf, sta, 1992 search_tbl, index); 1993 if (!ret) 1994 goto out; 1995 1996 break; 1997 1998 case IWL_MIMO3_SWITCH_MIMO2_AB: 1999 case IWL_MIMO3_SWITCH_MIMO2_AC: 2000 case IWL_MIMO3_SWITCH_MIMO2_BC: 2001 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n"); 2002 2003 memcpy(search_tbl, tbl, sz); 2004 search_tbl->is_SGI = 0; 2005 if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB) 2006 search_tbl->ant_type = ANT_AB; 2007 else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC) 2008 search_tbl->ant_type = ANT_AC; 2009 else 2010 search_tbl->ant_type = ANT_BC; 2011 2012 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 2013 break; 2014 2015 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta, 2016 search_tbl, index); 2017 if (!ret) 2018 goto out; 2019 2020 break; 2021 2022 case IWL_MIMO3_SWITCH_GI: 2023 if (!tbl->is_ht40 && !(ht_cap->cap & 2024 IEEE80211_HT_CAP_SGI_20)) 2025 break; 2026 if (tbl->is_ht40 && !(ht_cap->cap & 2027 IEEE80211_HT_CAP_SGI_40)) 2028 break; 2029 2030 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n"); 2031 2032 /* Set up new search table for MIMO */ 2033 memcpy(search_tbl, tbl, sz); 2034 search_tbl->is_SGI = !tbl->is_SGI; 2035 rs_set_expected_tpt_table(lq_sta, search_tbl); 2036 /* 2037 * If active table already uses the fastest possible 2038 * modulation (dual stream with short guard interval), 2039 * and it's working well, there's no need to look 2040 * for a better type of modulation! 2041 */ 2042 if (tbl->is_SGI) { 2043 s32 tpt = lq_sta->last_tpt / 100; 2044 if (tpt >= search_tbl->expected_tpt[index]) 2045 break; 2046 } 2047 search_tbl->current_rate = 2048 rate_n_flags_from_tbl(priv, search_tbl, 2049 index, is_green); 2050 update_search_tbl_counter = 1; 2051 goto out; 2052 } 2053 tbl->action++; 2054 if (tbl->action > IWL_MIMO3_SWITCH_GI) 2055 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1; 2056 2057 if (tbl->action == start_action) 2058 break; 2059 } 2060 search_tbl->lq_type = LQ_NONE; 2061 return; 2062 out: 2063 lq_sta->search_better_tbl = 1; 2064 tbl->action++; 2065 if (tbl->action > IWL_MIMO3_SWITCH_GI) 2066 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1; 2067 if (update_search_tbl_counter) 2068 search_tbl->action = tbl->action; 2069 } 2070 2071 /* 2072 * Check whether we should continue using same modulation mode, or 2073 * begin search for a new mode, based on: 2074 * 1) # tx successes or failures while using this mode 2075 * 2) # times calling this function 2076 * 3) elapsed time in this mode (not used, for now) 2077 */ 2078 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search) 2079 { 2080 struct iwl_scale_tbl_info *tbl; 2081 int i; 2082 int active_tbl; 2083 int flush_interval_passed = 0; 2084 struct iwl_priv *priv; 2085 2086 priv = lq_sta->drv; 2087 active_tbl = lq_sta->active_tbl; 2088 2089 tbl = &(lq_sta->lq_info[active_tbl]); 2090 2091 /* If we've been disallowing search, see if we should now allow it */ 2092 if (lq_sta->stay_in_tbl) { 2093 2094 /* Elapsed time using current modulation mode */ 2095 if (lq_sta->flush_timer) 2096 flush_interval_passed = 2097 time_after(jiffies, 2098 (unsigned long)(lq_sta->flush_timer + 2099 IWL_RATE_SCALE_FLUSH_INTVL)); 2100 2101 /* 2102 * Check if we should allow search for new modulation mode. 2103 * If many frames have failed or succeeded, or we've used 2104 * this same modulation for a long time, allow search, and 2105 * reset history stats that keep track of whether we should 2106 * allow a new search. Also (below) reset all bitmaps and 2107 * stats in active history. 2108 */ 2109 if (force_search || 2110 (lq_sta->total_failed > lq_sta->max_failure_limit) || 2111 (lq_sta->total_success > lq_sta->max_success_limit) || 2112 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer) 2113 && (flush_interval_passed))) { 2114 IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n", 2115 lq_sta->total_failed, 2116 lq_sta->total_success, 2117 flush_interval_passed); 2118 2119 /* Allow search for new mode */ 2120 lq_sta->stay_in_tbl = 0; /* only place reset */ 2121 lq_sta->total_failed = 0; 2122 lq_sta->total_success = 0; 2123 lq_sta->flush_timer = 0; 2124 2125 /* 2126 * Else if we've used this modulation mode enough repetitions 2127 * (regardless of elapsed time or success/failure), reset 2128 * history bitmaps and rate-specific stats for all rates in 2129 * active table. 2130 */ 2131 } else { 2132 lq_sta->table_count++; 2133 if (lq_sta->table_count >= 2134 lq_sta->table_count_limit) { 2135 lq_sta->table_count = 0; 2136 2137 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n"); 2138 for (i = 0; i < IWL_RATE_COUNT; i++) 2139 rs_rate_scale_clear_window( 2140 &(tbl->win[i])); 2141 } 2142 } 2143 2144 /* If transitioning to allow "search", reset all history 2145 * bitmaps and stats in active table (this will become the new 2146 * "search" table). */ 2147 if (!lq_sta->stay_in_tbl) { 2148 for (i = 0; i < IWL_RATE_COUNT; i++) 2149 rs_rate_scale_clear_window(&(tbl->win[i])); 2150 } 2151 } 2152 } 2153 2154 /* 2155 * setup rate table in uCode 2156 */ 2157 static void rs_update_rate_tbl(struct iwl_priv *priv, 2158 struct iwl_rxon_context *ctx, 2159 struct iwl_lq_sta *lq_sta, 2160 struct iwl_scale_tbl_info *tbl, 2161 int index, u8 is_green) 2162 { 2163 u32 rate; 2164 2165 /* Update uCode's rate table. */ 2166 rate = rate_n_flags_from_tbl(priv, tbl, index, is_green); 2167 rs_fill_link_cmd(priv, lq_sta, rate); 2168 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false); 2169 } 2170 2171 /* 2172 * Do rate scaling and search for new modulation mode. 2173 */ 2174 static void rs_rate_scale_perform(struct iwl_priv *priv, 2175 struct sk_buff *skb, 2176 struct ieee80211_sta *sta, 2177 struct iwl_lq_sta *lq_sta) 2178 { 2179 struct ieee80211_hw *hw = priv->hw; 2180 struct ieee80211_conf *conf = &hw->conf; 2181 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2182 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 2183 int low = IWL_RATE_INVALID; 2184 int high = IWL_RATE_INVALID; 2185 int index; 2186 int i; 2187 struct iwl_rate_scale_data *window = NULL; 2188 int current_tpt = IWL_INVALID_VALUE; 2189 int low_tpt = IWL_INVALID_VALUE; 2190 int high_tpt = IWL_INVALID_VALUE; 2191 u32 fail_count; 2192 s8 scale_action = 0; 2193 u16 rate_mask; 2194 u8 update_lq = 0; 2195 struct iwl_scale_tbl_info *tbl, *tbl1; 2196 u16 rate_scale_index_msk = 0; 2197 u8 is_green = 0; 2198 u8 active_tbl = 0; 2199 u8 done_search = 0; 2200 u16 high_low; 2201 s32 sr; 2202 u8 tid = IWL_MAX_TID_COUNT; 2203 struct iwl_tid_data *tid_data; 2204 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv; 2205 struct iwl_rxon_context *ctx = sta_priv->ctx; 2206 2207 IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n"); 2208 2209 /* Send management frames and NO_ACK data using lowest rate. */ 2210 /* TODO: this could probably be improved.. */ 2211 if (!ieee80211_is_data(hdr->frame_control) || 2212 info->flags & IEEE80211_TX_CTL_NO_ACK) 2213 return; 2214 2215 lq_sta->supp_rates = sta->deflink.supp_rates[lq_sta->band]; 2216 2217 tid = rs_tl_add_packet(lq_sta, hdr); 2218 if ((tid != IWL_MAX_TID_COUNT) && 2219 (lq_sta->tx_agg_tid_en & (1 << tid))) { 2220 tid_data = &priv->tid_data[lq_sta->lq.sta_id][tid]; 2221 if (tid_data->agg.state == IWL_AGG_OFF) 2222 lq_sta->is_agg = 0; 2223 else 2224 lq_sta->is_agg = 1; 2225 } else 2226 lq_sta->is_agg = 0; 2227 2228 /* 2229 * Select rate-scale / modulation-mode table to work with in 2230 * the rest of this function: "search" if searching for better 2231 * modulation mode, or "active" if doing rate scaling within a mode. 2232 */ 2233 if (!lq_sta->search_better_tbl) 2234 active_tbl = lq_sta->active_tbl; 2235 else 2236 active_tbl = 1 - lq_sta->active_tbl; 2237 2238 tbl = &(lq_sta->lq_info[active_tbl]); 2239 if (is_legacy(tbl->lq_type)) 2240 lq_sta->is_green = 0; 2241 else 2242 lq_sta->is_green = rs_use_green(sta); 2243 is_green = lq_sta->is_green; 2244 2245 /* current tx rate */ 2246 index = lq_sta->last_txrate_idx; 2247 2248 IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index, 2249 tbl->lq_type); 2250 2251 /* rates available for this association, and for modulation mode */ 2252 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type); 2253 2254 IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask); 2255 2256 /* mask with station rate restriction */ 2257 if (is_legacy(tbl->lq_type)) { 2258 if (lq_sta->band == NL80211_BAND_5GHZ) 2259 /* supp_rates has no CCK bits in A mode */ 2260 rate_scale_index_msk = (u16) (rate_mask & 2261 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE)); 2262 else 2263 rate_scale_index_msk = (u16) (rate_mask & 2264 lq_sta->supp_rates); 2265 2266 } else 2267 rate_scale_index_msk = rate_mask; 2268 2269 if (!rate_scale_index_msk) 2270 rate_scale_index_msk = rate_mask; 2271 2272 if (!((1 << index) & rate_scale_index_msk)) { 2273 IWL_ERR(priv, "Current Rate is not valid\n"); 2274 if (lq_sta->search_better_tbl) { 2275 /* revert to active table if search table is not valid*/ 2276 tbl->lq_type = LQ_NONE; 2277 lq_sta->search_better_tbl = 0; 2278 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 2279 /* get "active" rate info */ 2280 index = iwl_hwrate_to_plcp_idx(tbl->current_rate); 2281 rs_update_rate_tbl(priv, ctx, lq_sta, tbl, 2282 index, is_green); 2283 } 2284 return; 2285 } 2286 2287 /* Get expected throughput table and history window for current rate */ 2288 if (!tbl->expected_tpt) { 2289 IWL_ERR(priv, "tbl->expected_tpt is NULL\n"); 2290 return; 2291 } 2292 2293 /* force user max rate if set by user */ 2294 if ((lq_sta->max_rate_idx != -1) && 2295 (lq_sta->max_rate_idx < index)) { 2296 index = lq_sta->max_rate_idx; 2297 update_lq = 1; 2298 window = &(tbl->win[index]); 2299 goto lq_update; 2300 } 2301 2302 window = &(tbl->win[index]); 2303 2304 /* 2305 * If there is not enough history to calculate actual average 2306 * throughput, keep analyzing results of more tx frames, without 2307 * changing rate or mode (bypass most of the rest of this function). 2308 * Set up new rate table in uCode only if old rate is not supported 2309 * in current association (use new rate found above). 2310 */ 2311 fail_count = window->counter - window->success_counter; 2312 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) && 2313 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) { 2314 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d " 2315 "for index %d\n", 2316 window->success_counter, window->counter, index); 2317 2318 /* Can't calculate this yet; not enough history */ 2319 window->average_tpt = IWL_INVALID_VALUE; 2320 2321 /* Should we stay with this modulation mode, 2322 * or search for a new one? */ 2323 rs_stay_in_table(lq_sta, false); 2324 2325 goto out; 2326 } 2327 /* Else we have enough samples; calculate estimate of 2328 * actual average throughput */ 2329 if (window->average_tpt != ((window->success_ratio * 2330 tbl->expected_tpt[index] + 64) / 128)) { 2331 IWL_ERR(priv, "expected_tpt should have been calculated by now\n"); 2332 window->average_tpt = ((window->success_ratio * 2333 tbl->expected_tpt[index] + 64) / 128); 2334 } 2335 2336 /* If we are searching for better modulation mode, check success. */ 2337 if (lq_sta->search_better_tbl && 2338 (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) { 2339 /* If good success, continue using the "search" mode; 2340 * no need to send new link quality command, since we're 2341 * continuing to use the setup that we've been trying. */ 2342 if (window->average_tpt > lq_sta->last_tpt) { 2343 2344 IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE " 2345 "suc=%d cur-tpt=%d old-tpt=%d\n", 2346 window->success_ratio, 2347 window->average_tpt, 2348 lq_sta->last_tpt); 2349 2350 if (!is_legacy(tbl->lq_type)) 2351 lq_sta->enable_counter = 1; 2352 2353 /* Swap tables; "search" becomes "active" */ 2354 lq_sta->active_tbl = active_tbl; 2355 current_tpt = window->average_tpt; 2356 2357 /* Else poor success; go back to mode in "active" table */ 2358 } else { 2359 2360 IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE " 2361 "suc=%d cur-tpt=%d old-tpt=%d\n", 2362 window->success_ratio, 2363 window->average_tpt, 2364 lq_sta->last_tpt); 2365 2366 /* Nullify "search" table */ 2367 tbl->lq_type = LQ_NONE; 2368 2369 /* Revert to "active" table */ 2370 active_tbl = lq_sta->active_tbl; 2371 tbl = &(lq_sta->lq_info[active_tbl]); 2372 2373 /* Revert to "active" rate and throughput info */ 2374 index = iwl_hwrate_to_plcp_idx(tbl->current_rate); 2375 current_tpt = lq_sta->last_tpt; 2376 2377 /* Need to set up a new rate table in uCode */ 2378 update_lq = 1; 2379 } 2380 2381 /* Either way, we've made a decision; modulation mode 2382 * search is done, allow rate adjustment next time. */ 2383 lq_sta->search_better_tbl = 0; 2384 done_search = 1; /* Don't switch modes below! */ 2385 goto lq_update; 2386 } 2387 2388 /* (Else) not in search of better modulation mode, try for better 2389 * starting rate, while staying in this mode. */ 2390 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk, 2391 tbl->lq_type); 2392 low = high_low & 0xff; 2393 high = (high_low >> 8) & 0xff; 2394 2395 /* If user set max rate, dont allow higher than user constrain */ 2396 if ((lq_sta->max_rate_idx != -1) && 2397 (lq_sta->max_rate_idx < high)) 2398 high = IWL_RATE_INVALID; 2399 2400 sr = window->success_ratio; 2401 2402 /* Collect measured throughputs for current and adjacent rates */ 2403 current_tpt = window->average_tpt; 2404 if (low != IWL_RATE_INVALID) 2405 low_tpt = tbl->win[low].average_tpt; 2406 if (high != IWL_RATE_INVALID) 2407 high_tpt = tbl->win[high].average_tpt; 2408 2409 scale_action = 0; 2410 2411 /* Too many failures, decrease rate */ 2412 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) { 2413 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n"); 2414 scale_action = -1; 2415 2416 /* No throughput measured yet for adjacent rates; try increase. */ 2417 } else if ((low_tpt == IWL_INVALID_VALUE) && 2418 (high_tpt == IWL_INVALID_VALUE)) { 2419 2420 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH) 2421 scale_action = 1; 2422 else if (low != IWL_RATE_INVALID) 2423 scale_action = 0; 2424 } 2425 2426 /* Both adjacent throughputs are measured, but neither one has better 2427 * throughput; we're using the best rate, don't change it! */ 2428 else if ((low_tpt != IWL_INVALID_VALUE) && 2429 (high_tpt != IWL_INVALID_VALUE) && 2430 (low_tpt < current_tpt) && 2431 (high_tpt < current_tpt)) 2432 scale_action = 0; 2433 2434 /* At least one adjacent rate's throughput is measured, 2435 * and may have better performance. */ 2436 else { 2437 /* Higher adjacent rate's throughput is measured */ 2438 if (high_tpt != IWL_INVALID_VALUE) { 2439 /* Higher rate has better throughput */ 2440 if (high_tpt > current_tpt && 2441 sr >= IWL_RATE_INCREASE_TH) { 2442 scale_action = 1; 2443 } else { 2444 scale_action = 0; 2445 } 2446 2447 /* Lower adjacent rate's throughput is measured */ 2448 } else if (low_tpt != IWL_INVALID_VALUE) { 2449 /* Lower rate has better throughput */ 2450 if (low_tpt > current_tpt) { 2451 IWL_DEBUG_RATE(priv, 2452 "decrease rate because of low tpt\n"); 2453 scale_action = -1; 2454 } else if (sr >= IWL_RATE_INCREASE_TH) { 2455 scale_action = 1; 2456 } 2457 } 2458 } 2459 2460 /* Sanity check; asked for decrease, but success rate or throughput 2461 * has been good at old rate. Don't change it. */ 2462 if ((scale_action == -1) && (low != IWL_RATE_INVALID) && 2463 ((sr > IWL_RATE_HIGH_TH) || 2464 (current_tpt > (100 * tbl->expected_tpt[low])))) 2465 scale_action = 0; 2466 if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type)) 2467 scale_action = -1; 2468 if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI && 2469 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) 2470 scale_action = -1; 2471 2472 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) && 2473 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) { 2474 if (lq_sta->last_bt_traffic > priv->bt_traffic_load) { 2475 /* 2476 * don't set scale_action, don't want to scale up if 2477 * the rate scale doesn't otherwise think that is a 2478 * good idea. 2479 */ 2480 } else if (lq_sta->last_bt_traffic <= priv->bt_traffic_load) { 2481 scale_action = -1; 2482 } 2483 } 2484 lq_sta->last_bt_traffic = priv->bt_traffic_load; 2485 2486 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) && 2487 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) { 2488 /* search for a new modulation */ 2489 rs_stay_in_table(lq_sta, true); 2490 goto lq_update; 2491 } 2492 2493 switch (scale_action) { 2494 case -1: 2495 /* Decrease starting rate, update uCode's rate table */ 2496 if (low != IWL_RATE_INVALID) { 2497 update_lq = 1; 2498 index = low; 2499 } 2500 2501 break; 2502 case 1: 2503 /* Increase starting rate, update uCode's rate table */ 2504 if (high != IWL_RATE_INVALID) { 2505 update_lq = 1; 2506 index = high; 2507 } 2508 2509 break; 2510 case 0: 2511 /* No change */ 2512 default: 2513 break; 2514 } 2515 2516 IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d " 2517 "high %d type %d\n", 2518 index, scale_action, low, high, tbl->lq_type); 2519 2520 lq_update: 2521 /* Replace uCode's rate table for the destination station. */ 2522 if (update_lq) 2523 rs_update_rate_tbl(priv, ctx, lq_sta, tbl, index, is_green); 2524 2525 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) { 2526 /* Should we stay with this modulation mode, 2527 * or search for a new one? */ 2528 rs_stay_in_table(lq_sta, false); 2529 } 2530 /* 2531 * Search for new modulation mode if we're: 2532 * 1) Not changing rates right now 2533 * 2) Not just finishing up a search 2534 * 3) Allowing a new search 2535 */ 2536 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) { 2537 /* Save current throughput to compare with "search" throughput*/ 2538 lq_sta->last_tpt = current_tpt; 2539 2540 /* Select a new "search" modulation mode to try. 2541 * If one is found, set up the new "search" table. */ 2542 if (is_legacy(tbl->lq_type)) 2543 rs_move_legacy_other(priv, lq_sta, conf, sta, index); 2544 else if (is_siso(tbl->lq_type)) 2545 rs_move_siso_to_other(priv, lq_sta, conf, sta, index); 2546 else if (is_mimo2(tbl->lq_type)) 2547 rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index); 2548 else 2549 rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index); 2550 2551 /* If new "search" mode was selected, set up in uCode table */ 2552 if (lq_sta->search_better_tbl) { 2553 /* Access the "search" table, clear its history. */ 2554 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 2555 for (i = 0; i < IWL_RATE_COUNT; i++) 2556 rs_rate_scale_clear_window(&(tbl->win[i])); 2557 2558 /* Use new "search" start rate */ 2559 index = iwl_hwrate_to_plcp_idx(tbl->current_rate); 2560 2561 IWL_DEBUG_RATE(priv, "Switch current mcs: %X index: %d\n", 2562 tbl->current_rate, index); 2563 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate); 2564 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false); 2565 } else 2566 done_search = 1; 2567 } 2568 2569 if (done_search && !lq_sta->stay_in_tbl) { 2570 /* If the "active" (non-search) mode was legacy, 2571 * and we've tried switching antennas, 2572 * but we haven't been able to try HT modes (not available), 2573 * stay with best antenna legacy modulation for a while 2574 * before next round of mode comparisons. */ 2575 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]); 2576 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) && 2577 lq_sta->action_counter > tbl1->max_search) { 2578 IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n"); 2579 rs_set_stay_in_table(priv, 1, lq_sta); 2580 } 2581 2582 /* If we're in an HT mode, and all 3 mode switch actions 2583 * have been tried and compared, stay in this best modulation 2584 * mode for a while before next round of mode comparisons. */ 2585 if (lq_sta->enable_counter && 2586 (lq_sta->action_counter >= tbl1->max_search) && 2587 iwl_ht_enabled(priv)) { 2588 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) && 2589 (lq_sta->tx_agg_tid_en & (1 << tid)) && 2590 (tid != IWL_MAX_TID_COUNT)) { 2591 u8 sta_id = lq_sta->lq.sta_id; 2592 tid_data = &priv->tid_data[sta_id][tid]; 2593 if (tid_data->agg.state == IWL_AGG_OFF) { 2594 IWL_DEBUG_RATE(priv, 2595 "try to aggregate tid %d\n", 2596 tid); 2597 rs_tl_turn_on_agg(priv, tid, 2598 lq_sta, sta); 2599 } 2600 } 2601 rs_set_stay_in_table(priv, 0, lq_sta); 2602 } 2603 } 2604 2605 out: 2606 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green); 2607 lq_sta->last_txrate_idx = index; 2608 } 2609 2610 /* 2611 * rs_initialize_lq - Initialize a station's hardware rate table 2612 * 2613 * The uCode's station table contains a table of fallback rates 2614 * for automatic fallback during transmission. 2615 * 2616 * NOTE: This sets up a default set of values. These will be replaced later 2617 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of 2618 * rc80211_simple. 2619 * 2620 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before 2621 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD, 2622 * which requires station table entry to exist). 2623 */ 2624 static void rs_initialize_lq(struct iwl_priv *priv, 2625 struct ieee80211_sta *sta, 2626 struct iwl_lq_sta *lq_sta) 2627 { 2628 struct iwl_scale_tbl_info *tbl; 2629 int rate_idx; 2630 int i; 2631 u32 rate; 2632 u8 use_green = rs_use_green(sta); 2633 u8 active_tbl = 0; 2634 u8 valid_tx_ant; 2635 struct iwl_station_priv *sta_priv; 2636 struct iwl_rxon_context *ctx; 2637 2638 if (!sta || !lq_sta) 2639 return; 2640 2641 sta_priv = (void *)sta->drv_priv; 2642 ctx = sta_priv->ctx; 2643 2644 i = lq_sta->last_txrate_idx; 2645 2646 valid_tx_ant = priv->nvm_data->valid_tx_ant; 2647 2648 if (!lq_sta->search_better_tbl) 2649 active_tbl = lq_sta->active_tbl; 2650 else 2651 active_tbl = 1 - lq_sta->active_tbl; 2652 2653 tbl = &(lq_sta->lq_info[active_tbl]); 2654 2655 if ((i < 0) || (i >= IWL_RATE_COUNT)) 2656 i = 0; 2657 2658 rate = iwl_rates[i].plcp; 2659 tbl->ant_type = first_antenna(valid_tx_ant); 2660 rate |= tbl->ant_type << RATE_MCS_ANT_POS; 2661 2662 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE) 2663 rate |= RATE_MCS_CCK_MSK; 2664 2665 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx); 2666 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type)) 2667 rs_toggle_antenna(valid_tx_ant, &rate, tbl); 2668 2669 rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green); 2670 tbl->current_rate = rate; 2671 rs_set_expected_tpt_table(lq_sta, tbl); 2672 rs_fill_link_cmd(NULL, lq_sta, rate); 2673 priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq; 2674 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, 0, true); 2675 } 2676 2677 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta, 2678 struct ieee80211_tx_rate_control *txrc) 2679 { 2680 2681 struct sk_buff *skb = txrc->skb; 2682 struct ieee80211_supported_band *sband = txrc->sband; 2683 struct iwl_op_mode *op_mode __maybe_unused = 2684 (struct iwl_op_mode *)priv_r; 2685 struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode); 2686 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2687 struct iwl_lq_sta *lq_sta = priv_sta; 2688 int rate_idx; 2689 2690 IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n"); 2691 2692 /* Get max rate if user set max rate */ 2693 if (lq_sta) { 2694 lq_sta->max_rate_idx = fls(txrc->rate_idx_mask) - 1; 2695 if ((sband->band == NL80211_BAND_5GHZ) && 2696 (lq_sta->max_rate_idx != -1)) 2697 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE; 2698 if ((lq_sta->max_rate_idx < 0) || 2699 (lq_sta->max_rate_idx >= IWL_RATE_COUNT)) 2700 lq_sta->max_rate_idx = -1; 2701 } 2702 2703 /* Treat uninitialized rate scaling data same as non-existing. */ 2704 if (lq_sta && !lq_sta->drv) { 2705 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n"); 2706 priv_sta = NULL; 2707 } 2708 2709 rate_idx = lq_sta->last_txrate_idx; 2710 2711 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) { 2712 rate_idx -= IWL_FIRST_OFDM_RATE; 2713 /* 6M and 9M shared same MCS index */ 2714 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0; 2715 if (rs_extract_rate(lq_sta->last_rate_n_flags) >= 2716 IWL_RATE_MIMO3_6M_PLCP) 2717 rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM); 2718 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >= 2719 IWL_RATE_MIMO2_6M_PLCP) 2720 rate_idx = rate_idx + MCS_INDEX_PER_STREAM; 2721 info->control.rates[0].flags = IEEE80211_TX_RC_MCS; 2722 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK) 2723 info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI; 2724 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK) 2725 info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA; 2726 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK) 2727 info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2728 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK) 2729 info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD; 2730 } else { 2731 /* Check for invalid rates */ 2732 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) || 2733 ((sband->band == NL80211_BAND_5GHZ) && 2734 (rate_idx < IWL_FIRST_OFDM_RATE))) 2735 rate_idx = rate_lowest_index(sband, sta); 2736 /* On valid 5 GHz rate, adjust index */ 2737 else if (sband->band == NL80211_BAND_5GHZ) 2738 rate_idx -= IWL_FIRST_OFDM_RATE; 2739 info->control.rates[0].flags = 0; 2740 } 2741 info->control.rates[0].idx = rate_idx; 2742 info->control.rates[0].count = 1; 2743 } 2744 2745 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta, 2746 gfp_t gfp) 2747 { 2748 struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv; 2749 struct iwl_op_mode *op_mode __maybe_unused = 2750 (struct iwl_op_mode *)priv_rate; 2751 struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode); 2752 2753 IWL_DEBUG_RATE(priv, "create station rate scale window\n"); 2754 2755 return &sta_priv->lq_sta; 2756 } 2757 2758 /* 2759 * Called after adding a new station to initialize rate scaling 2760 */ 2761 void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id) 2762 { 2763 int i, j; 2764 struct ieee80211_hw *hw = priv->hw; 2765 struct ieee80211_conf *conf = &priv->hw->conf; 2766 struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap; 2767 struct iwl_station_priv *sta_priv; 2768 struct iwl_lq_sta *lq_sta; 2769 struct ieee80211_supported_band *sband; 2770 unsigned long supp; /* must be unsigned long for for_each_set_bit */ 2771 2772 sta_priv = (struct iwl_station_priv *) sta->drv_priv; 2773 lq_sta = &sta_priv->lq_sta; 2774 sband = hw->wiphy->bands[conf->chandef.chan->band]; 2775 2776 2777 lq_sta->lq.sta_id = sta_id; 2778 2779 for (j = 0; j < LQ_SIZE; j++) 2780 for (i = 0; i < IWL_RATE_COUNT; i++) 2781 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]); 2782 2783 lq_sta->flush_timer = 0; 2784 lq_sta->supp_rates = sta->deflink.supp_rates[sband->band]; 2785 2786 IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n", 2787 sta_id); 2788 /* TODO: what is a good starting rate for STA? About middle? Maybe not 2789 * the lowest or the highest rate.. Could consider using RSSI from 2790 * previous packets? Need to have IEEE 802.1X auth succeed immediately 2791 * after assoc.. */ 2792 2793 lq_sta->is_dup = 0; 2794 lq_sta->max_rate_idx = -1; 2795 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX; 2796 lq_sta->is_green = rs_use_green(sta); 2797 lq_sta->band = sband->band; 2798 /* 2799 * active legacy rates as per supported rates bitmap 2800 */ 2801 supp = sta->deflink.supp_rates[sband->band]; 2802 lq_sta->active_legacy_rate = 0; 2803 for_each_set_bit(i, &supp, BITS_PER_LONG) 2804 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value); 2805 2806 /* 2807 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3), 2808 * supp_rates[] does not; shift to convert format, force 9 MBits off. 2809 */ 2810 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1; 2811 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1; 2812 lq_sta->active_siso_rate &= ~((u16)0x2); 2813 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE; 2814 2815 /* Same here */ 2816 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1; 2817 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1; 2818 lq_sta->active_mimo2_rate &= ~((u16)0x2); 2819 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE; 2820 2821 lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1; 2822 lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1; 2823 lq_sta->active_mimo3_rate &= ~((u16)0x2); 2824 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE; 2825 2826 IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n", 2827 lq_sta->active_siso_rate, 2828 lq_sta->active_mimo2_rate, 2829 lq_sta->active_mimo3_rate); 2830 2831 /* These values will be overridden later */ 2832 lq_sta->lq.general_params.single_stream_ant_msk = 2833 first_antenna(priv->nvm_data->valid_tx_ant); 2834 lq_sta->lq.general_params.dual_stream_ant_msk = 2835 priv->nvm_data->valid_tx_ant & 2836 ~first_antenna(priv->nvm_data->valid_tx_ant); 2837 if (!lq_sta->lq.general_params.dual_stream_ant_msk) { 2838 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB; 2839 } else if (num_of_ant(priv->nvm_data->valid_tx_ant) == 2) { 2840 lq_sta->lq.general_params.dual_stream_ant_msk = 2841 priv->nvm_data->valid_tx_ant; 2842 } 2843 2844 /* as default allow aggregation for all tids */ 2845 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID; 2846 lq_sta->drv = priv; 2847 2848 /* Set last_txrate_idx to lowest rate */ 2849 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta); 2850 if (sband->band == NL80211_BAND_5GHZ) 2851 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE; 2852 lq_sta->is_agg = 0; 2853 #ifdef CONFIG_MAC80211_DEBUGFS 2854 lq_sta->dbg_fixed_rate = 0; 2855 #endif 2856 2857 rs_initialize_lq(priv, sta, lq_sta); 2858 } 2859 2860 static void rs_fill_link_cmd(struct iwl_priv *priv, 2861 struct iwl_lq_sta *lq_sta, u32 new_rate) 2862 { 2863 struct iwl_scale_tbl_info tbl_type; 2864 int index = 0; 2865 int rate_idx; 2866 int repeat_rate = 0; 2867 u8 ant_toggle_cnt = 0; 2868 u8 use_ht_possible = 1; 2869 u8 valid_tx_ant = 0; 2870 struct iwl_station_priv *sta_priv = 2871 container_of(lq_sta, struct iwl_station_priv, lq_sta); 2872 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq; 2873 2874 /* Override starting rate (index 0) if needed for debug purposes */ 2875 rs_dbgfs_set_mcs(lq_sta, &new_rate, index); 2876 2877 /* Interpret new_rate (rate_n_flags) */ 2878 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, 2879 &tbl_type, &rate_idx); 2880 2881 if (priv && priv->bt_full_concurrent) { 2882 /* 1x1 only */ 2883 tbl_type.ant_type = 2884 first_antenna(priv->nvm_data->valid_tx_ant); 2885 } 2886 2887 /* How many times should we repeat the initial rate? */ 2888 if (is_legacy(tbl_type.lq_type)) { 2889 ant_toggle_cnt = 1; 2890 repeat_rate = IWL_NUMBER_TRY; 2891 } else { 2892 repeat_rate = min(IWL_HT_NUMBER_TRY, 2893 LINK_QUAL_AGG_DISABLE_START_DEF - 1); 2894 } 2895 2896 lq_cmd->general_params.mimo_delimiter = 2897 is_mimo(tbl_type.lq_type) ? 1 : 0; 2898 2899 /* Fill 1st table entry (index 0) */ 2900 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate); 2901 2902 if (num_of_ant(tbl_type.ant_type) == 1) { 2903 lq_cmd->general_params.single_stream_ant_msk = 2904 tbl_type.ant_type; 2905 } else if (num_of_ant(tbl_type.ant_type) == 2) { 2906 lq_cmd->general_params.dual_stream_ant_msk = 2907 tbl_type.ant_type; 2908 } /* otherwise we don't modify the existing value */ 2909 2910 index++; 2911 repeat_rate--; 2912 if (priv) { 2913 if (priv->bt_full_concurrent) 2914 valid_tx_ant = ANT_A; 2915 else 2916 valid_tx_ant = priv->nvm_data->valid_tx_ant; 2917 } 2918 2919 /* Fill rest of rate table */ 2920 while (index < LINK_QUAL_MAX_RETRY_NUM) { 2921 /* Repeat initial/next rate. 2922 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute. 2923 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */ 2924 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) { 2925 if (is_legacy(tbl_type.lq_type)) { 2926 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE) 2927 ant_toggle_cnt++; 2928 else if (priv && 2929 rs_toggle_antenna(valid_tx_ant, 2930 &new_rate, &tbl_type)) 2931 ant_toggle_cnt = 1; 2932 } 2933 2934 /* Override next rate if needed for debug purposes */ 2935 rs_dbgfs_set_mcs(lq_sta, &new_rate, index); 2936 2937 /* Fill next table entry */ 2938 lq_cmd->rs_table[index].rate_n_flags = 2939 cpu_to_le32(new_rate); 2940 repeat_rate--; 2941 index++; 2942 } 2943 2944 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type, 2945 &rate_idx); 2946 2947 if (priv && priv->bt_full_concurrent) { 2948 /* 1x1 only */ 2949 tbl_type.ant_type = 2950 first_antenna(priv->nvm_data->valid_tx_ant); 2951 } 2952 2953 /* Indicate to uCode which entries might be MIMO. 2954 * If initial rate was MIMO, this will finally end up 2955 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */ 2956 if (is_mimo(tbl_type.lq_type)) 2957 lq_cmd->general_params.mimo_delimiter = index; 2958 2959 /* Get next rate */ 2960 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx, 2961 use_ht_possible); 2962 2963 /* How many times should we repeat the next rate? */ 2964 if (is_legacy(tbl_type.lq_type)) { 2965 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE) 2966 ant_toggle_cnt++; 2967 else if (priv && 2968 rs_toggle_antenna(valid_tx_ant, 2969 &new_rate, &tbl_type)) 2970 ant_toggle_cnt = 1; 2971 2972 repeat_rate = IWL_NUMBER_TRY; 2973 } else { 2974 repeat_rate = IWL_HT_NUMBER_TRY; 2975 } 2976 2977 /* Don't allow HT rates after next pass. 2978 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */ 2979 use_ht_possible = 0; 2980 2981 /* Override next rate if needed for debug purposes */ 2982 rs_dbgfs_set_mcs(lq_sta, &new_rate, index); 2983 2984 /* Fill next table entry */ 2985 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate); 2986 2987 index++; 2988 repeat_rate--; 2989 } 2990 2991 lq_cmd->agg_params.agg_frame_cnt_limit = 2992 sta_priv->max_agg_bufsize ?: LINK_QUAL_AGG_FRAME_LIMIT_DEF; 2993 lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF; 2994 2995 lq_cmd->agg_params.agg_time_limit = 2996 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF); 2997 /* 2998 * overwrite if needed, pass aggregation time limit 2999 * to uCode in uSec 3000 */ 3001 if (priv && priv->lib->bt_params && 3002 priv->lib->bt_params->agg_time_limit && 3003 priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) 3004 lq_cmd->agg_params.agg_time_limit = 3005 cpu_to_le16(priv->lib->bt_params->agg_time_limit); 3006 } 3007 3008 static void *rs_alloc(struct ieee80211_hw *hw) 3009 { 3010 return hw->priv; 3011 } 3012 /* rate scale requires free function to be implemented */ 3013 static void rs_free(void *priv_rate) 3014 { 3015 return; 3016 } 3017 3018 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta, 3019 void *priv_sta) 3020 { 3021 struct iwl_op_mode *op_mode __maybe_unused = priv_r; 3022 struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode); 3023 3024 IWL_DEBUG_RATE(priv, "enter\n"); 3025 IWL_DEBUG_RATE(priv, "leave\n"); 3026 } 3027 3028 #ifdef CONFIG_MAC80211_DEBUGFS 3029 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta, 3030 u32 *rate_n_flags, int index) 3031 { 3032 struct iwl_priv *priv; 3033 u8 valid_tx_ant; 3034 u8 ant_sel_tx; 3035 3036 priv = lq_sta->drv; 3037 valid_tx_ant = priv->nvm_data->valid_tx_ant; 3038 if (lq_sta->dbg_fixed_rate) { 3039 ant_sel_tx = 3040 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK) 3041 >> RATE_MCS_ANT_POS); 3042 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) { 3043 *rate_n_flags = lq_sta->dbg_fixed_rate; 3044 IWL_DEBUG_RATE(priv, "Fixed rate ON\n"); 3045 } else { 3046 lq_sta->dbg_fixed_rate = 0; 3047 IWL_ERR(priv, 3048 "Invalid antenna selection 0x%X, Valid is 0x%X\n", 3049 ant_sel_tx, valid_tx_ant); 3050 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n"); 3051 } 3052 } else { 3053 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n"); 3054 } 3055 } 3056 3057 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file, 3058 const char __user *user_buf, size_t count, loff_t *ppos) 3059 { 3060 struct iwl_lq_sta *lq_sta = file->private_data; 3061 struct iwl_priv *priv; 3062 char buf[64]; 3063 size_t buf_size; 3064 u32 parsed_rate; 3065 3066 3067 priv = lq_sta->drv; 3068 memset(buf, 0, sizeof(buf)); 3069 buf_size = min(count, sizeof(buf) - 1); 3070 if (copy_from_user(buf, user_buf, buf_size)) 3071 return -EFAULT; 3072 3073 if (sscanf(buf, "%x", &parsed_rate) == 1) 3074 lq_sta->dbg_fixed_rate = parsed_rate; 3075 else 3076 lq_sta->dbg_fixed_rate = 0; 3077 3078 rs_program_fix_rate(priv, lq_sta); 3079 3080 return count; 3081 } 3082 3083 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file, 3084 char __user *user_buf, size_t count, loff_t *ppos) 3085 { 3086 char *buff; 3087 int desc = 0; 3088 int i = 0; 3089 int index = 0; 3090 ssize_t ret; 3091 3092 struct iwl_lq_sta *lq_sta = file->private_data; 3093 struct iwl_priv *priv; 3094 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 3095 3096 priv = lq_sta->drv; 3097 buff = kmalloc(1024, GFP_KERNEL); 3098 if (!buff) 3099 return -ENOMEM; 3100 3101 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id); 3102 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n", 3103 lq_sta->total_failed, lq_sta->total_success, 3104 lq_sta->active_legacy_rate); 3105 desc += sprintf(buff+desc, "fixed rate 0x%X\n", 3106 lq_sta->dbg_fixed_rate); 3107 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n", 3108 (priv->nvm_data->valid_tx_ant & ANT_A) ? "ANT_A," : "", 3109 (priv->nvm_data->valid_tx_ant & ANT_B) ? "ANT_B," : "", 3110 (priv->nvm_data->valid_tx_ant & ANT_C) ? "ANT_C" : ""); 3111 desc += sprintf(buff+desc, "lq type %s\n", 3112 (is_legacy(tbl->lq_type)) ? "legacy" : "HT"); 3113 if (is_Ht(tbl->lq_type)) { 3114 desc += sprintf(buff + desc, " %s", 3115 (is_siso(tbl->lq_type)) ? "SISO" : 3116 ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3")); 3117 desc += sprintf(buff + desc, " %s", 3118 (tbl->is_ht40) ? "40MHz" : "20MHz"); 3119 desc += sprintf(buff + desc, " %s %s %s\n", 3120 (tbl->is_SGI) ? "SGI" : "", 3121 (lq_sta->is_green) ? "GF enabled" : "", 3122 (lq_sta->is_agg) ? "AGG on" : ""); 3123 } 3124 desc += sprintf(buff+desc, "last tx rate=0x%X\n", 3125 lq_sta->last_rate_n_flags); 3126 desc += sprintf(buff+desc, "general:" 3127 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n", 3128 lq_sta->lq.general_params.flags, 3129 lq_sta->lq.general_params.mimo_delimiter, 3130 lq_sta->lq.general_params.single_stream_ant_msk, 3131 lq_sta->lq.general_params.dual_stream_ant_msk); 3132 3133 desc += sprintf(buff+desc, "agg:" 3134 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n", 3135 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit), 3136 lq_sta->lq.agg_params.agg_dis_start_th, 3137 lq_sta->lq.agg_params.agg_frame_cnt_limit); 3138 3139 desc += sprintf(buff+desc, 3140 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n", 3141 lq_sta->lq.general_params.start_rate_index[0], 3142 lq_sta->lq.general_params.start_rate_index[1], 3143 lq_sta->lq.general_params.start_rate_index[2], 3144 lq_sta->lq.general_params.start_rate_index[3]); 3145 3146 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) { 3147 index = iwl_hwrate_to_plcp_idx( 3148 le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags)); 3149 if (is_legacy(tbl->lq_type)) { 3150 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n", 3151 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags), 3152 iwl_rate_mcs[index].mbps); 3153 } else { 3154 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n", 3155 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags), 3156 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs); 3157 } 3158 } 3159 3160 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3161 kfree(buff); 3162 return ret; 3163 } 3164 3165 static const struct file_operations rs_sta_dbgfs_scale_table_ops = { 3166 .write = rs_sta_dbgfs_scale_table_write, 3167 .read = rs_sta_dbgfs_scale_table_read, 3168 .open = simple_open, 3169 .llseek = default_llseek, 3170 }; 3171 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file, 3172 char __user *user_buf, size_t count, loff_t *ppos) 3173 { 3174 char *buff; 3175 int desc = 0; 3176 int i, j; 3177 ssize_t ret; 3178 3179 struct iwl_lq_sta *lq_sta = file->private_data; 3180 3181 buff = kmalloc(1024, GFP_KERNEL); 3182 if (!buff) 3183 return -ENOMEM; 3184 3185 for (i = 0; i < LQ_SIZE; i++) { 3186 desc += sprintf(buff+desc, 3187 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n" 3188 "rate=0x%X\n", 3189 lq_sta->active_tbl == i ? "*" : "x", 3190 lq_sta->lq_info[i].lq_type, 3191 lq_sta->lq_info[i].is_SGI, 3192 lq_sta->lq_info[i].is_ht40, 3193 lq_sta->lq_info[i].is_dup, 3194 lq_sta->is_green, 3195 lq_sta->lq_info[i].current_rate); 3196 for (j = 0; j < IWL_RATE_COUNT; j++) { 3197 desc += sprintf(buff+desc, 3198 "counter=%d success=%d %%=%d\n", 3199 lq_sta->lq_info[i].win[j].counter, 3200 lq_sta->lq_info[i].win[j].success_counter, 3201 lq_sta->lq_info[i].win[j].success_ratio); 3202 } 3203 } 3204 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3205 kfree(buff); 3206 return ret; 3207 } 3208 3209 static const struct file_operations rs_sta_dbgfs_stats_table_ops = { 3210 .read = rs_sta_dbgfs_stats_table_read, 3211 .open = simple_open, 3212 .llseek = default_llseek, 3213 }; 3214 3215 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file, 3216 char __user *user_buf, size_t count, loff_t *ppos) 3217 { 3218 struct iwl_lq_sta *lq_sta = file->private_data; 3219 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl]; 3220 char buff[120]; 3221 int desc = 0; 3222 3223 if (is_Ht(tbl->lq_type)) 3224 desc += sprintf(buff+desc, 3225 "Bit Rate= %d Mb/s\n", 3226 tbl->expected_tpt[lq_sta->last_txrate_idx]); 3227 else 3228 desc += sprintf(buff+desc, 3229 "Bit Rate= %d Mb/s\n", 3230 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1); 3231 3232 return simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3233 } 3234 3235 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = { 3236 .read = rs_sta_dbgfs_rate_scale_data_read, 3237 .open = simple_open, 3238 .llseek = default_llseek, 3239 }; 3240 3241 static void rs_add_debugfs(void *priv, void *priv_sta, 3242 struct dentry *dir) 3243 { 3244 struct iwl_lq_sta *lq_sta = priv_sta; 3245 3246 debugfs_create_file("rate_scale_table", 0600, dir, lq_sta, 3247 &rs_sta_dbgfs_scale_table_ops); 3248 debugfs_create_file("rate_stats_table", 0400, dir, lq_sta, 3249 &rs_sta_dbgfs_stats_table_ops); 3250 debugfs_create_file("rate_scale_data", 0400, dir, lq_sta, 3251 &rs_sta_dbgfs_rate_scale_data_ops); 3252 debugfs_create_u8("tx_agg_tid_enable", 0600, dir, 3253 &lq_sta->tx_agg_tid_en); 3254 3255 } 3256 #endif 3257 3258 /* 3259 * Initialization of rate scaling information is done by driver after 3260 * the station is added. Since mac80211 calls this function before a 3261 * station is added we ignore it. 3262 */ 3263 static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband, 3264 struct cfg80211_chan_def *chandef, 3265 struct ieee80211_sta *sta, void *priv_sta) 3266 { 3267 } 3268 3269 static const struct rate_control_ops rs_ops = { 3270 .name = RS_NAME, 3271 .tx_status = rs_tx_status, 3272 .get_rate = rs_get_rate, 3273 .rate_init = rs_rate_init_stub, 3274 .alloc = rs_alloc, 3275 .free = rs_free, 3276 .alloc_sta = rs_alloc_sta, 3277 .free_sta = rs_free_sta, 3278 #ifdef CONFIG_MAC80211_DEBUGFS 3279 .add_sta_debugfs = rs_add_debugfs, 3280 #endif 3281 }; 3282 3283 int iwlagn_rate_control_register(void) 3284 { 3285 return ieee80211_rate_control_register(&rs_ops); 3286 } 3287 3288 void iwlagn_rate_control_unregister(void) 3289 { 3290 ieee80211_rate_control_unregister(&rs_ops); 3291 } 3292 3293