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 - 2023 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 36static 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 46static 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 */ 78const 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 95static inline u8 rs_extract_rate(u32 rate_n_flags) 96{ 97 return (u8)(rate_n_flags & RATE_MCS_RATE_MSK); 98} 99 100static 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 IWL_RATE_INVALID; 129} 130 131static 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); 135static void rs_fill_link_cmd(struct iwl_priv *priv, 136 struct iwl_lq_sta *lq_sta, u32 rate_n_flags); 137static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search); 138 139 140#ifdef CONFIG_MAC80211_DEBUGFS 141static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta, 142 u32 *rate_n_flags, int index); 143#else 144static 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 160static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = { 161 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0 162}; 163 164static 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 171static 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 178static 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 185static 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 192static 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 199static 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#define MCS_INDEX_PER_STREAM (8) 207 208static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window) 209{ 210 window->data = 0; 211 window->success_counter = 0; 212 window->success_ratio = IWL_INVALID_VALUE; 213 window->counter = 0; 214 window->average_tpt = IWL_INVALID_VALUE; 215 window->stamp = 0; 216} 217 218static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type) 219{ 220 return (ant_type & valid_antenna) == ant_type; 221} 222 223/* 224 * removes the old data from the statistics. All data that is older than 225 * TID_MAX_TIME_DIFF, will be deleted. 226 */ 227static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time) 228{ 229 /* The oldest age we want to keep */ 230 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF; 231 232 while (tl->queue_count && 233 (tl->time_stamp < oldest_time)) { 234 tl->total -= tl->packet_count[tl->head]; 235 tl->packet_count[tl->head] = 0; 236 tl->time_stamp += TID_QUEUE_CELL_SPACING; 237 tl->queue_count--; 238 tl->head++; 239 if (tl->head >= TID_QUEUE_MAX_SIZE) 240 tl->head = 0; 241 } 242} 243 244/* 245 * increment traffic load value for tid and also remove 246 * any old values if passed the certain time period 247 */ 248static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data, 249 struct ieee80211_hdr *hdr) 250{ 251 u32 curr_time = jiffies_to_msecs(jiffies); 252 u32 time_diff; 253 s32 index; 254 struct iwl_traffic_load *tl = NULL; 255 u8 tid; 256 257 if (ieee80211_is_data_qos(hdr->frame_control)) { 258 u8 *qc = ieee80211_get_qos_ctl(hdr); 259 tid = qc[0] & 0xf; 260 } else 261 return IWL_MAX_TID_COUNT; 262 263 if (unlikely(tid >= IWL_MAX_TID_COUNT)) 264 return IWL_MAX_TID_COUNT; 265 266 tl = &lq_data->load[tid]; 267 268 curr_time -= curr_time % TID_ROUND_VALUE; 269 270 /* Happens only for the first packet. Initialize the data */ 271 if (!(tl->queue_count)) { 272 tl->total = 1; 273 tl->time_stamp = curr_time; 274 tl->queue_count = 1; 275 tl->head = 0; 276 tl->packet_count[0] = 1; 277 return IWL_MAX_TID_COUNT; 278 } 279 280 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time); 281 index = time_diff / TID_QUEUE_CELL_SPACING; 282 283 /* The history is too long: remove data that is older than */ 284 /* TID_MAX_TIME_DIFF */ 285 if (index >= TID_QUEUE_MAX_SIZE) 286 rs_tl_rm_old_stats(tl, curr_time); 287 288 index = (tl->head + index) % TID_QUEUE_MAX_SIZE; 289 tl->packet_count[index] = tl->packet_count[index] + 1; 290 tl->total = tl->total + 1; 291 292 if ((index + 1) > tl->queue_count) 293 tl->queue_count = index + 1; 294 295 return tid; 296} 297 298#ifdef CONFIG_MAC80211_DEBUGFS 299/* 300 * Program the device to use fixed rate for frame transmit 301 * This is for debugging/testing only 302 * once the device start use fixed rate, we need to reload the module 303 * to being back the normal operation. 304 */ 305static void rs_program_fix_rate(struct iwl_priv *priv, 306 struct iwl_lq_sta *lq_sta) 307{ 308 struct iwl_station_priv *sta_priv = 309 container_of(lq_sta, struct iwl_station_priv, lq_sta); 310 struct iwl_rxon_context *ctx = sta_priv->ctx; 311 312 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */ 313 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 314 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 315 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 316 317 IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n", 318 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate); 319 320 if (lq_sta->dbg_fixed_rate) { 321 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate); 322 iwl_send_lq_cmd(lq_sta->drv, ctx, &lq_sta->lq, CMD_ASYNC, 323 false); 324 } 325} 326#endif 327 328/* 329 get the traffic load value for tid 330*/ 331static void rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid) 332{ 333 u32 curr_time = jiffies_to_msecs(jiffies); 334 u32 time_diff; 335 s32 index; 336 struct iwl_traffic_load *tl = NULL; 337 338 if (tid >= IWL_MAX_TID_COUNT) 339 return; 340 341 tl = &(lq_data->load[tid]); 342 343 curr_time -= curr_time % TID_ROUND_VALUE; 344 345 if (!(tl->queue_count)) 346 return; 347 348 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time); 349 index = time_diff / TID_QUEUE_CELL_SPACING; 350 351 /* The history is too long: remove data that is older than */ 352 /* TID_MAX_TIME_DIFF */ 353 if (index >= TID_QUEUE_MAX_SIZE) 354 rs_tl_rm_old_stats(tl, curr_time); 355} 356 357static int rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv, 358 struct iwl_lq_sta *lq_data, u8 tid, 359 struct ieee80211_sta *sta) 360{ 361 int ret = -EAGAIN; 362 363 /* 364 * Don't create TX aggregation sessions when in high 365 * BT traffic, as they would just be disrupted by BT. 366 */ 367 if (priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) { 368 IWL_DEBUG_COEX(priv, 369 "BT traffic (%d), no aggregation allowed\n", 370 priv->bt_traffic_load); 371 return ret; 372 } 373 374 rs_tl_get_load(lq_data, tid); 375 376 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n", 377 sta->addr, tid); 378 ret = ieee80211_start_tx_ba_session(sta, tid, 5000); 379 if (ret == -EAGAIN) { 380 /* 381 * driver and mac80211 is out of sync 382 * this might be cause by reloading firmware 383 * stop the tx ba session here 384 */ 385 IWL_ERR(priv, "Fail start Tx agg on tid: %d\n", 386 tid); 387 ieee80211_stop_tx_ba_session(sta, tid); 388 } 389 return ret; 390} 391 392static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid, 393 struct iwl_lq_sta *lq_data, 394 struct ieee80211_sta *sta) 395{ 396 if (tid < IWL_MAX_TID_COUNT) 397 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta); 398 else 399 IWL_ERR(priv, "tid exceeds max TID count: %d/%d\n", 400 tid, IWL_MAX_TID_COUNT); 401} 402 403static inline int get_num_of_ant_from_rate(u32 rate_n_flags) 404{ 405 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) + 406 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) + 407 !!(rate_n_flags & RATE_MCS_ANT_C_MSK); 408} 409 410/* 411 * Static function to get the expected throughput from an iwl_scale_tbl_info 412 * that wraps a NULL pointer check 413 */ 414static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index) 415{ 416 if (tbl->expected_tpt) 417 return tbl->expected_tpt[rs_index]; 418 return 0; 419} 420 421/* 422 * rs_collect_tx_data - Update the success/failure sliding window 423 * 424 * We keep a sliding window of the last 62 packets transmitted 425 * at this rate. window->data contains the bitmask of successful 426 * packets. 427 */ 428static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl, 429 int scale_index, int attempts, int successes) 430{ 431 struct iwl_rate_scale_data *window = NULL; 432 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1)); 433 s32 fail_count, tpt; 434 435 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT) 436 return -EINVAL; 437 438 /* Select window for current tx bit rate */ 439 window = &(tbl->win[scale_index]); 440 441 /* Get expected throughput */ 442 tpt = get_expected_tpt(tbl, scale_index); 443 444 /* 445 * Keep track of only the latest 62 tx frame attempts in this rate's 446 * history window; anything older isn't really relevant any more. 447 * If we have filled up the sliding window, drop the oldest attempt; 448 * if the oldest attempt (highest bit in bitmap) shows "success", 449 * subtract "1" from the success counter (this is the main reason 450 * we keep these bitmaps!). 451 */ 452 while (attempts > 0) { 453 if (window->counter >= IWL_RATE_MAX_WINDOW) { 454 455 /* remove earliest */ 456 window->counter = IWL_RATE_MAX_WINDOW - 1; 457 458 if (window->data & mask) { 459 window->data &= ~mask; 460 window->success_counter--; 461 } 462 } 463 464 /* Increment frames-attempted counter */ 465 window->counter++; 466 467 /* Shift bitmap by one frame to throw away oldest history */ 468 window->data <<= 1; 469 470 /* Mark the most recent #successes attempts as successful */ 471 if (successes > 0) { 472 window->success_counter++; 473 window->data |= 0x1; 474 successes--; 475 } 476 477 attempts--; 478 } 479 480 /* Calculate current success ratio, avoid divide-by-0! */ 481 if (window->counter > 0) 482 window->success_ratio = 128 * (100 * window->success_counter) 483 / window->counter; 484 else 485 window->success_ratio = IWL_INVALID_VALUE; 486 487 fail_count = window->counter - window->success_counter; 488 489 /* Calculate average throughput, if we have enough history. */ 490 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) || 491 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH)) 492 window->average_tpt = (window->success_ratio * tpt + 64) / 128; 493 else 494 window->average_tpt = IWL_INVALID_VALUE; 495 496 /* Tag this window as having been updated */ 497 window->stamp = jiffies; 498 499 return 0; 500} 501 502/* 503 * Fill uCode API rate_n_flags field, based on "search" or "active" table. 504 */ 505/* FIXME:RS:remove this function and put the flags statically in the table */ 506static u32 rate_n_flags_from_tbl(struct iwl_priv *priv, 507 struct iwl_scale_tbl_info *tbl, 508 int index, u8 use_green) 509{ 510 u32 rate_n_flags = 0; 511 512 if (is_legacy(tbl->lq_type)) { 513 rate_n_flags = iwl_rates[index].plcp; 514 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE) 515 rate_n_flags |= RATE_MCS_CCK_MSK; 516 517 } else if (is_Ht(tbl->lq_type)) { 518 if (index > IWL_LAST_OFDM_RATE) { 519 IWL_ERR(priv, "Invalid HT rate index %d\n", index); 520 index = IWL_LAST_OFDM_RATE; 521 } 522 rate_n_flags = RATE_MCS_HT_MSK; 523 524 if (is_siso(tbl->lq_type)) 525 rate_n_flags |= iwl_rates[index].plcp_siso; 526 else if (is_mimo2(tbl->lq_type)) 527 rate_n_flags |= iwl_rates[index].plcp_mimo2; 528 else 529 rate_n_flags |= iwl_rates[index].plcp_mimo3; 530 } else { 531 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type); 532 } 533 534 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) & 535 RATE_MCS_ANT_ABC_MSK); 536 537 if (is_Ht(tbl->lq_type)) { 538 if (tbl->is_ht40) { 539 if (tbl->is_dup) 540 rate_n_flags |= RATE_MCS_DUP_MSK; 541 else 542 rate_n_flags |= RATE_MCS_HT40_MSK; 543 } 544 if (tbl->is_SGI) 545 rate_n_flags |= RATE_MCS_SGI_MSK; 546 547 if (use_green) { 548 rate_n_flags |= RATE_MCS_GF_MSK; 549 if (is_siso(tbl->lq_type) && tbl->is_SGI) { 550 rate_n_flags &= ~RATE_MCS_SGI_MSK; 551 IWL_ERR(priv, "GF was set with SGI:SISO\n"); 552 } 553 } 554 } 555 return rate_n_flags; 556} 557 558/* 559 * Interpret uCode API's rate_n_flags format, 560 * fill "search" or "active" tx mode table. 561 */ 562static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags, 563 enum nl80211_band band, 564 struct iwl_scale_tbl_info *tbl, 565 int *rate_idx) 566{ 567 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK); 568 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags); 569 u8 mcs; 570 571 memset(tbl, 0, sizeof(struct iwl_scale_tbl_info)); 572 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags); 573 574 if (*rate_idx == IWL_RATE_INVALID) { 575 *rate_idx = -1; 576 return -EINVAL; 577 } 578 tbl->is_SGI = 0; /* default legacy setup */ 579 tbl->is_ht40 = 0; 580 tbl->is_dup = 0; 581 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS); 582 tbl->lq_type = LQ_NONE; 583 tbl->max_search = IWL_MAX_SEARCH; 584 585 /* legacy rate format */ 586 if (!(rate_n_flags & RATE_MCS_HT_MSK)) { 587 if (num_of_ant == 1) { 588 if (band == NL80211_BAND_5GHZ) 589 tbl->lq_type = LQ_A; 590 else 591 tbl->lq_type = LQ_G; 592 } 593 /* HT rate format */ 594 } else { 595 if (rate_n_flags & RATE_MCS_SGI_MSK) 596 tbl->is_SGI = 1; 597 598 if ((rate_n_flags & RATE_MCS_HT40_MSK) || 599 (rate_n_flags & RATE_MCS_DUP_MSK)) 600 tbl->is_ht40 = 1; 601 602 if (rate_n_flags & RATE_MCS_DUP_MSK) 603 tbl->is_dup = 1; 604 605 mcs = rs_extract_rate(rate_n_flags); 606 607 /* SISO */ 608 if (mcs <= IWL_RATE_SISO_60M_PLCP) { 609 if (num_of_ant == 1) 610 tbl->lq_type = LQ_SISO; /*else NONE*/ 611 /* MIMO2 */ 612 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) { 613 if (num_of_ant == 2) 614 tbl->lq_type = LQ_MIMO2; 615 /* MIMO3 */ 616 } else { 617 if (num_of_ant == 3) { 618 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH; 619 tbl->lq_type = LQ_MIMO3; 620 } 621 } 622 } 623 return 0; 624} 625 626/* switch to another antenna/antennas and return 1 */ 627/* if no other valid antenna found, return 0 */ 628static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags, 629 struct iwl_scale_tbl_info *tbl) 630{ 631 u8 new_ant_type; 632 633 if (!tbl->ant_type || tbl->ant_type > ANT_ABC) 634 return 0; 635 636 if (!rs_is_valid_ant(valid_ant, tbl->ant_type)) 637 return 0; 638 639 new_ant_type = ant_toggle_lookup[tbl->ant_type]; 640 641 while ((new_ant_type != tbl->ant_type) && 642 !rs_is_valid_ant(valid_ant, new_ant_type)) 643 new_ant_type = ant_toggle_lookup[new_ant_type]; 644 645 if (new_ant_type == tbl->ant_type) 646 return 0; 647 648 tbl->ant_type = new_ant_type; 649 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK; 650 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS; 651 return 1; 652} 653 654/* 655 * Green-field mode is valid if the station supports it and 656 * there are no non-GF stations present in the BSS. 657 */ 658static bool rs_use_green(struct ieee80211_sta *sta) 659{ 660 /* 661 * There's a bug somewhere in this code that causes the 662 * scaling to get stuck because GF+SGI can't be combined 663 * in SISO rates. Until we find that bug, disable GF, it 664 * has only limited benefit and we still interoperate with 665 * GF APs since we can always receive GF transmissions. 666 */ 667 return false; 668} 669 670/* 671 * rs_get_supported_rates - get the available rates 672 * 673 * if management frame or broadcast frame only return 674 * basic available rates. 675 * 676 */ 677static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta, 678 struct ieee80211_hdr *hdr, 679 enum iwl_table_type rate_type) 680{ 681 if (is_legacy(rate_type)) { 682 return lq_sta->active_legacy_rate; 683 } else { 684 if (is_siso(rate_type)) 685 return lq_sta->active_siso_rate; 686 else if (is_mimo2(rate_type)) 687 return lq_sta->active_mimo2_rate; 688 else 689 return lq_sta->active_mimo3_rate; 690 } 691} 692 693static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask, 694 int rate_type) 695{ 696 u8 high = IWL_RATE_INVALID; 697 u8 low = IWL_RATE_INVALID; 698 699 /* 802.11A or ht walks to the next literal adjacent rate in 700 * the rate table */ 701 if (is_a_band(rate_type) || !is_legacy(rate_type)) { 702 int i; 703 u32 mask; 704 705 /* Find the previous rate that is in the rate mask */ 706 i = index - 1; 707 if (i >= 0) 708 mask = BIT(i); 709 710 for (; i >= 0; i--, mask >>= 1) { 711 if (rate_mask & mask) { 712 low = i; 713 break; 714 } 715 } 716 717 /* Find the next rate that is in the rate mask */ 718 i = index + 1; 719 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) { 720 if (rate_mask & mask) { 721 high = i; 722 break; 723 } 724 } 725 726 return (high << 8) | low; 727 } 728 729 low = index; 730 while (low != IWL_RATE_INVALID) { 731 low = iwl_rates[low].prev_rs; 732 if (low == IWL_RATE_INVALID) 733 break; 734 if (rate_mask & (1 << low)) 735 break; 736 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low); 737 } 738 739 high = index; 740 while (high != IWL_RATE_INVALID) { 741 high = iwl_rates[high].next_rs; 742 if (high == IWL_RATE_INVALID) 743 break; 744 if (rate_mask & (1 << high)) 745 break; 746 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high); 747 } 748 749 return (high << 8) | low; 750} 751 752static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta, 753 struct iwl_scale_tbl_info *tbl, 754 u8 scale_index, u8 ht_possible) 755{ 756 s32 low; 757 u16 rate_mask; 758 u16 high_low; 759 u8 switch_to_legacy = 0; 760 u8 is_green = lq_sta->is_green; 761 struct iwl_priv *priv = lq_sta->drv; 762 763 /* check if we need to switch from HT to legacy rates. 764 * assumption is that mandatory rates (1Mbps or 6Mbps) 765 * are always supported (spec demand) */ 766 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) { 767 switch_to_legacy = 1; 768 scale_index = rs_ht_to_legacy[scale_index]; 769 if (lq_sta->band == NL80211_BAND_5GHZ) 770 tbl->lq_type = LQ_A; 771 else 772 tbl->lq_type = LQ_G; 773 774 if (num_of_ant(tbl->ant_type) > 1) 775 tbl->ant_type = 776 first_antenna(priv->nvm_data->valid_tx_ant); 777 778 tbl->is_ht40 = 0; 779 tbl->is_SGI = 0; 780 tbl->max_search = IWL_MAX_SEARCH; 781 } 782 783 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type); 784 785 /* Mask with station rate restriction */ 786 if (is_legacy(tbl->lq_type)) { 787 /* supp_rates has no CCK bits in A mode */ 788 if (lq_sta->band == NL80211_BAND_5GHZ) 789 rate_mask = (u16)(rate_mask & 790 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE)); 791 else 792 rate_mask = (u16)(rate_mask & lq_sta->supp_rates); 793 } 794 795 /* If we switched from HT to legacy, check current rate */ 796 if (switch_to_legacy && (rate_mask & (1 << scale_index))) { 797 low = scale_index; 798 goto out; 799 } 800 801 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask, 802 tbl->lq_type); 803 low = high_low & 0xff; 804 805 if (low == IWL_RATE_INVALID) 806 low = scale_index; 807 808out: 809 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green); 810} 811 812/* 813 * Simple function to compare two rate scale table types 814 */ 815static bool table_type_matches(struct iwl_scale_tbl_info *a, 816 struct iwl_scale_tbl_info *b) 817{ 818 return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) && 819 (a->is_SGI == b->is_SGI); 820} 821 822static void rs_bt_update_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx, 823 struct iwl_lq_sta *lq_sta) 824{ 825 struct iwl_scale_tbl_info *tbl; 826 bool full_concurrent = priv->bt_full_concurrent; 827 828 if ((priv->bt_traffic_load != priv->last_bt_traffic_load) || 829 (priv->bt_full_concurrent != full_concurrent)) { 830 priv->bt_full_concurrent = full_concurrent; 831 priv->last_bt_traffic_load = priv->bt_traffic_load; 832 833 /* Update uCode's rate table. */ 834 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 835 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate); 836 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false); 837 838 queue_work(priv->workqueue, &priv->bt_full_concurrency); 839 } 840} 841 842/* 843 * mac80211 sends us Tx status 844 */ 845static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband, 846 struct ieee80211_sta *sta, void *priv_sta, 847 struct sk_buff *skb) 848{ 849 int legacy_success; 850 int retries; 851 int rs_index, mac_index, i; 852 struct iwl_lq_sta *lq_sta = priv_sta; 853 struct iwl_link_quality_cmd *table; 854 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 855 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)priv_r; 856 struct iwl_priv *priv = IWL_OP_MODE_GET_DVM(op_mode); 857 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 858 enum mac80211_rate_control_flags mac_flags; 859 u32 tx_rate; 860 struct iwl_scale_tbl_info tbl_type; 861 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl; 862 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv; 863 struct iwl_rxon_context *ctx = sta_priv->ctx; 864 865 IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n"); 866 867 /* Treat uninitialized rate scaling data same as non-existing. */ 868 if (!lq_sta) { 869 IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n"); 870 return; 871 } else if (!lq_sta->drv) { 872 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n"); 873 return; 874 } 875 876 if (!ieee80211_is_data(hdr->frame_control) || 877 info->flags & IEEE80211_TX_CTL_NO_ACK) 878 return; 879 880 /* This packet was aggregated but doesn't carry status info */ 881 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 882 !(info->flags & IEEE80211_TX_STAT_AMPDU)) 883 return; 884 885 /* 886 * Ignore this Tx frame response if its initial rate doesn't match 887 * that of latest Link Quality command. There may be stragglers 888 * from a previous Link Quality command, but we're no longer interested 889 * in those; they're either from the "active" mode while we're trying 890 * to check "search" mode, or a prior "search" mode after we've moved 891 * to a new "search" mode (which might become the new "active" mode). 892 */ 893 table = &lq_sta->lq; 894 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags); 895 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index); 896 if (priv->band == NL80211_BAND_5GHZ) 897 rs_index -= IWL_FIRST_OFDM_RATE; 898 mac_flags = info->status.rates[0].flags; 899 mac_index = info->status.rates[0].idx; 900 /* For HT packets, map MCS to PLCP */ 901 if (mac_flags & IEEE80211_TX_RC_MCS) { 902 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */ 903 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE)) 904 mac_index++; 905 /* 906 * mac80211 HT index is always zero-indexed; we need to move 907 * HT OFDM rates after CCK rates in 2.4 GHz band 908 */ 909 if (priv->band == NL80211_BAND_2GHZ) 910 mac_index += IWL_FIRST_OFDM_RATE; 911 } 912 /* Here we actually compare this rate to the latest LQ command */ 913 if ((mac_index < 0) || 914 (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) || 915 (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) || 916 (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) || 917 (tbl_type.ant_type != info->status.antenna) || 918 (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) || 919 (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) || 920 (rs_index != mac_index)) { 921 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate); 922 /* 923 * Since rates mis-match, the last LQ command may have failed. 924 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with 925 * ... driver. 926 */ 927 lq_sta->missed_rate_counter++; 928 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) { 929 lq_sta->missed_rate_counter = 0; 930 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false); 931 } 932 /* Regardless, ignore this status info for outdated rate */ 933 return; 934 } else 935 /* Rate did match, so reset the missed_rate_counter */ 936 lq_sta->missed_rate_counter = 0; 937 938 /* Figure out if rate scale algorithm is in active or search table */ 939 if (table_type_matches(&tbl_type, 940 &(lq_sta->lq_info[lq_sta->active_tbl]))) { 941 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 942 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 943 } else if (table_type_matches(&tbl_type, 944 &lq_sta->lq_info[1 - lq_sta->active_tbl])) { 945 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 946 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 947 } else { 948 IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n"); 949 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 950 IWL_DEBUG_RATE(priv, "active- lq:%x, ant:%x, SGI:%d\n", 951 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI); 952 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 953 IWL_DEBUG_RATE(priv, "search- lq:%x, ant:%x, SGI:%d\n", 954 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI); 955 IWL_DEBUG_RATE(priv, "actual- lq:%x, ant:%x, SGI:%d\n", 956 tbl_type.lq_type, tbl_type.ant_type, tbl_type.is_SGI); 957 /* 958 * no matching table found, let's by-pass the data collection 959 * and continue to perform rate scale to find the rate table 960 */ 961 rs_stay_in_table(lq_sta, true); 962 goto done; 963 } 964 965 /* 966 * Updating the frame history depends on whether packets were 967 * aggregated. 968 * 969 * For aggregation, all packets were transmitted at the same rate, the 970 * first index into rate scale table. 971 */ 972 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 973 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags); 974 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, 975 &rs_index); 976 rs_collect_tx_data(curr_tbl, rs_index, 977 info->status.ampdu_len, 978 info->status.ampdu_ack_len); 979 980 /* Update success/fail counts if not searching for new mode */ 981 if (lq_sta->stay_in_tbl) { 982 lq_sta->total_success += info->status.ampdu_ack_len; 983 lq_sta->total_failed += (info->status.ampdu_len - 984 info->status.ampdu_ack_len); 985 } 986 } else { 987 /* 988 * For legacy, update frame history with for each Tx retry. 989 */ 990 retries = info->status.rates[0].count - 1; 991 /* HW doesn't send more than 15 retries */ 992 retries = min(retries, 15); 993 994 /* The last transmission may have been successful */ 995 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK); 996 /* Collect data for each rate used during failed TX attempts */ 997 for (i = 0; i <= retries; ++i) { 998 tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags); 999 rs_get_tbl_info_from_mcs(tx_rate, priv->band, 1000 &tbl_type, &rs_index); 1001 /* 1002 * Only collect stats if retried rate is in the same RS 1003 * table as active/search. 1004 */ 1005 if (table_type_matches(&tbl_type, curr_tbl)) 1006 tmp_tbl = curr_tbl; 1007 else if (table_type_matches(&tbl_type, other_tbl)) 1008 tmp_tbl = other_tbl; 1009 else 1010 continue; 1011 rs_collect_tx_data(tmp_tbl, rs_index, 1, 1012 i < retries ? 0 : legacy_success); 1013 } 1014 1015 /* Update success/fail counts if not searching for new mode */ 1016 if (lq_sta->stay_in_tbl) { 1017 lq_sta->total_success += legacy_success; 1018 lq_sta->total_failed += retries + (1 - legacy_success); 1019 } 1020 } 1021 /* The last TX rate is cached in lq_sta; it's set in if/else above */ 1022 lq_sta->last_rate_n_flags = tx_rate; 1023done: 1024 /* See if there's a better rate or modulation mode to try. */ 1025 if (sta && sta->deflink.supp_rates[sband->band]) 1026 rs_rate_scale_perform(priv, skb, sta, lq_sta); 1027 1028 if (priv->lib->bt_params && priv->lib->bt_params->advanced_bt_coexist) 1029 rs_bt_update_lq(priv, ctx, lq_sta); 1030} 1031 1032/* 1033 * Begin a period of staying with a selected modulation mode. 1034 * Set "stay_in_tbl" flag to prevent any mode switches. 1035 * Set frame tx success limits according to legacy vs. high-throughput, 1036 * and reset overall (spanning all rates) tx success history statistics. 1037 * These control how long we stay using same modulation mode before 1038 * searching for a new mode. 1039 */ 1040static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy, 1041 struct iwl_lq_sta *lq_sta) 1042{ 1043 IWL_DEBUG_RATE(priv, "we are staying in the same table\n"); 1044 lq_sta->stay_in_tbl = 1; /* only place this gets set */ 1045 if (is_legacy) { 1046 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT; 1047 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT; 1048 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT; 1049 } else { 1050 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT; 1051 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT; 1052 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT; 1053 } 1054 lq_sta->table_count = 0; 1055 lq_sta->total_failed = 0; 1056 lq_sta->total_success = 0; 1057 lq_sta->flush_timer = jiffies; 1058 lq_sta->action_counter = 0; 1059} 1060 1061/* 1062 * Find correct throughput table for given mode of modulation 1063 */ 1064static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1065 struct iwl_scale_tbl_info *tbl) 1066{ 1067 /* Used to choose among HT tables */ 1068 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT]; 1069 1070 /* Check for invalid LQ type */ 1071 if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) { 1072 tbl->expected_tpt = expected_tpt_legacy; 1073 return; 1074 } 1075 1076 /* Legacy rates have only one table */ 1077 if (is_legacy(tbl->lq_type)) { 1078 tbl->expected_tpt = expected_tpt_legacy; 1079 return; 1080 } 1081 1082 /* Choose among many HT tables depending on number of streams 1083 * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation 1084 * status */ 1085 if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup)) 1086 ht_tbl_pointer = expected_tpt_siso20MHz; 1087 else if (is_siso(tbl->lq_type)) 1088 ht_tbl_pointer = expected_tpt_siso40MHz; 1089 else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup)) 1090 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1091 else if (is_mimo2(tbl->lq_type)) 1092 ht_tbl_pointer = expected_tpt_mimo2_40MHz; 1093 else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup)) 1094 ht_tbl_pointer = expected_tpt_mimo3_20MHz; 1095 else /* if (is_mimo3(tbl->lq_type)) <-- must be true */ 1096 ht_tbl_pointer = expected_tpt_mimo3_40MHz; 1097 1098 if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */ 1099 tbl->expected_tpt = ht_tbl_pointer[0]; 1100 else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */ 1101 tbl->expected_tpt = ht_tbl_pointer[1]; 1102 else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */ 1103 tbl->expected_tpt = ht_tbl_pointer[2]; 1104 else /* AGG+SGI */ 1105 tbl->expected_tpt = ht_tbl_pointer[3]; 1106} 1107 1108/* 1109 * Find starting rate for new "search" high-throughput mode of modulation. 1110 * Goal is to find lowest expected rate (under perfect conditions) that is 1111 * above the current measured throughput of "active" mode, to give new mode 1112 * a fair chance to prove itself without too many challenges. 1113 * 1114 * This gets called when transitioning to more aggressive modulation 1115 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive 1116 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need 1117 * to decrease to match "active" throughput. When moving from MIMO to SISO, 1118 * bit rate will typically need to increase, but not if performance was bad. 1119 */ 1120static s32 rs_get_best_rate(struct iwl_priv *priv, 1121 struct iwl_lq_sta *lq_sta, 1122 struct iwl_scale_tbl_info *tbl, /* "search" */ 1123 u16 rate_mask, s8 index) 1124{ 1125 /* "active" values */ 1126 struct iwl_scale_tbl_info *active_tbl = 1127 &(lq_sta->lq_info[lq_sta->active_tbl]); 1128 s32 active_sr = active_tbl->win[index].success_ratio; 1129 s32 active_tpt = active_tbl->expected_tpt[index]; 1130 /* expected "search" throughput */ 1131 const u16 *tpt_tbl = tbl->expected_tpt; 1132 1133 s32 new_rate, high, low, start_hi; 1134 u16 high_low; 1135 s8 rate = index; 1136 1137 new_rate = high = low = start_hi = IWL_RATE_INVALID; 1138 1139 for (; ;) { 1140 high_low = rs_get_adjacent_rate(priv, rate, rate_mask, 1141 tbl->lq_type); 1142 1143 low = high_low & 0xff; 1144 high = (high_low >> 8) & 0xff; 1145 1146 /* 1147 * Lower the "search" bit rate, to give new "search" mode 1148 * approximately the same throughput as "active" if: 1149 * 1150 * 1) "Active" mode has been working modestly well (but not 1151 * great), and expected "search" throughput (under perfect 1152 * conditions) at candidate rate is above the actual 1153 * measured "active" throughput (but less than expected 1154 * "active" throughput under perfect conditions). 1155 * OR 1156 * 2) "Active" mode has been working perfectly or very well 1157 * and expected "search" throughput (under perfect 1158 * conditions) at candidate rate is above expected 1159 * "active" throughput (under perfect conditions). 1160 */ 1161 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) && 1162 ((active_sr > IWL_RATE_DECREASE_TH) && 1163 (active_sr <= IWL_RATE_HIGH_TH) && 1164 (tpt_tbl[rate] <= active_tpt))) || 1165 ((active_sr >= IWL_RATE_SCALE_SWITCH) && 1166 (tpt_tbl[rate] > active_tpt))) { 1167 1168 /* (2nd or later pass) 1169 * If we've already tried to raise the rate, and are 1170 * now trying to lower it, use the higher rate. */ 1171 if (start_hi != IWL_RATE_INVALID) { 1172 new_rate = start_hi; 1173 break; 1174 } 1175 1176 new_rate = rate; 1177 1178 /* Loop again with lower rate */ 1179 if (low != IWL_RATE_INVALID) 1180 rate = low; 1181 1182 /* Lower rate not available, use the original */ 1183 else 1184 break; 1185 1186 /* Else try to raise the "search" rate to match "active" */ 1187 } else { 1188 /* (2nd or later pass) 1189 * If we've already tried to lower the rate, and are 1190 * now trying to raise it, use the lower rate. */ 1191 if (new_rate != IWL_RATE_INVALID) 1192 break; 1193 1194 /* Loop again with higher rate */ 1195 else if (high != IWL_RATE_INVALID) { 1196 start_hi = high; 1197 rate = high; 1198 1199 /* Higher rate not available, use the original */ 1200 } else { 1201 new_rate = rate; 1202 break; 1203 } 1204 } 1205 } 1206 1207 return new_rate; 1208} 1209 1210/* 1211 * Set up search table for MIMO2 1212 */ 1213static int rs_switch_to_mimo2(struct iwl_priv *priv, 1214 struct iwl_lq_sta *lq_sta, 1215 struct ieee80211_conf *conf, 1216 struct ieee80211_sta *sta, 1217 struct iwl_scale_tbl_info *tbl, int index) 1218{ 1219 u16 rate_mask; 1220 s32 rate; 1221 s8 is_green = lq_sta->is_green; 1222 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv; 1223 struct iwl_rxon_context *ctx = sta_priv->ctx; 1224 1225 if (!conf_is_ht(conf) || !sta->deflink.ht_cap.ht_supported) 1226 return -1; 1227 1228 if (sta->deflink.smps_mode == IEEE80211_SMPS_STATIC) 1229 return -1; 1230 1231 /* Need both Tx chains/antennas to support MIMO */ 1232 if (priv->hw_params.tx_chains_num < 2) 1233 return -1; 1234 1235 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n"); 1236 1237 tbl->lq_type = LQ_MIMO2; 1238 tbl->is_dup = lq_sta->is_dup; 1239 tbl->action = 0; 1240 tbl->max_search = IWL_MAX_SEARCH; 1241 rate_mask = lq_sta->active_mimo2_rate; 1242 1243 if (iwl_is_ht40_tx_allowed(priv, ctx, sta)) 1244 tbl->is_ht40 = 1; 1245 else 1246 tbl->is_ht40 = 0; 1247 1248 rs_set_expected_tpt_table(lq_sta, tbl); 1249 1250 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index); 1251 1252 IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask); 1253 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) { 1254 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n", 1255 rate, rate_mask); 1256 return -1; 1257 } 1258 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green); 1259 1260 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n", 1261 tbl->current_rate, is_green); 1262 return 0; 1263} 1264 1265/* 1266 * Set up search table for MIMO3 1267 */ 1268static int rs_switch_to_mimo3(struct iwl_priv *priv, 1269 struct iwl_lq_sta *lq_sta, 1270 struct ieee80211_conf *conf, 1271 struct ieee80211_sta *sta, 1272 struct iwl_scale_tbl_info *tbl, int index) 1273{ 1274 u16 rate_mask; 1275 s32 rate; 1276 s8 is_green = lq_sta->is_green; 1277 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv; 1278 struct iwl_rxon_context *ctx = sta_priv->ctx; 1279 1280 if (!conf_is_ht(conf) || !sta->deflink.ht_cap.ht_supported) 1281 return -1; 1282 1283 if (sta->deflink.smps_mode == IEEE80211_SMPS_STATIC) 1284 return -1; 1285 1286 /* Need both Tx chains/antennas to support MIMO */ 1287 if (priv->hw_params.tx_chains_num < 3) 1288 return -1; 1289 1290 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n"); 1291 1292 tbl->lq_type = LQ_MIMO3; 1293 tbl->is_dup = lq_sta->is_dup; 1294 tbl->action = 0; 1295 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH; 1296 rate_mask = lq_sta->active_mimo3_rate; 1297 1298 if (iwl_is_ht40_tx_allowed(priv, ctx, sta)) 1299 tbl->is_ht40 = 1; 1300 else 1301 tbl->is_ht40 = 0; 1302 1303 rs_set_expected_tpt_table(lq_sta, tbl); 1304 1305 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index); 1306 1307 IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n", 1308 rate, rate_mask); 1309 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) { 1310 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n", 1311 rate, rate_mask); 1312 return -1; 1313 } 1314 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green); 1315 1316 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n", 1317 tbl->current_rate, is_green); 1318 return 0; 1319} 1320 1321/* 1322 * Set up search table for SISO 1323 */ 1324static int rs_switch_to_siso(struct iwl_priv *priv, 1325 struct iwl_lq_sta *lq_sta, 1326 struct ieee80211_conf *conf, 1327 struct ieee80211_sta *sta, 1328 struct iwl_scale_tbl_info *tbl, int index) 1329{ 1330 u16 rate_mask; 1331 u8 is_green = lq_sta->is_green; 1332 s32 rate; 1333 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv; 1334 struct iwl_rxon_context *ctx = sta_priv->ctx; 1335 1336 if (!conf_is_ht(conf) || !sta->deflink.ht_cap.ht_supported) 1337 return -1; 1338 1339 IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n"); 1340 1341 tbl->is_dup = lq_sta->is_dup; 1342 tbl->lq_type = LQ_SISO; 1343 tbl->action = 0; 1344 tbl->max_search = IWL_MAX_SEARCH; 1345 rate_mask = lq_sta->active_siso_rate; 1346 1347 if (iwl_is_ht40_tx_allowed(priv, ctx, sta)) 1348 tbl->is_ht40 = 1; 1349 else 1350 tbl->is_ht40 = 0; 1351 1352 if (is_green) 1353 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/ 1354 1355 rs_set_expected_tpt_table(lq_sta, tbl); 1356 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index); 1357 1358 IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask); 1359 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) { 1360 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n", 1361 rate, rate_mask); 1362 return -1; 1363 } 1364 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green); 1365 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n", 1366 tbl->current_rate, is_green); 1367 return 0; 1368} 1369 1370/* 1371 * Try to switch to new modulation mode from legacy 1372 */ 1373static void rs_move_legacy_other(struct iwl_priv *priv, 1374 struct iwl_lq_sta *lq_sta, 1375 struct ieee80211_conf *conf, 1376 struct ieee80211_sta *sta, 1377 int index) 1378{ 1379 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1380 struct iwl_scale_tbl_info *search_tbl = 1381 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 1382 struct iwl_rate_scale_data *window = &(tbl->win[index]); 1383 u32 sz = (sizeof(struct iwl_scale_tbl_info) - 1384 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); 1385 u8 start_action; 1386 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant; 1387 u8 tx_chains_num = priv->hw_params.tx_chains_num; 1388 int ret = 0; 1389 u8 update_search_tbl_counter = 0; 1390 1391 switch (priv->bt_traffic_load) { 1392 case IWL_BT_COEX_TRAFFIC_LOAD_NONE: 1393 /* nothing */ 1394 break; 1395 case IWL_BT_COEX_TRAFFIC_LOAD_LOW: 1396 /* avoid antenna B unless MIMO */ 1397 if (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2) 1398 tbl->action = IWL_LEGACY_SWITCH_SISO; 1399 break; 1400 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH: 1401 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS: 1402 /* avoid antenna B and MIMO */ 1403 valid_tx_ant = 1404 first_antenna(priv->nvm_data->valid_tx_ant); 1405 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2 && 1406 tbl->action != IWL_LEGACY_SWITCH_SISO) 1407 tbl->action = IWL_LEGACY_SWITCH_SISO; 1408 break; 1409 default: 1410 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load); 1411 break; 1412 } 1413 1414 if (!iwl_ht_enabled(priv)) 1415 /* stay in Legacy */ 1416 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1; 1417 else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE && 1418 tbl->action > IWL_LEGACY_SWITCH_SISO) 1419 tbl->action = IWL_LEGACY_SWITCH_SISO; 1420 1421 /* configure as 1x1 if bt full concurrency */ 1422 if (priv->bt_full_concurrent) { 1423 if (!iwl_ht_enabled(priv)) 1424 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1; 1425 else if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2) 1426 tbl->action = IWL_LEGACY_SWITCH_SISO; 1427 valid_tx_ant = 1428 first_antenna(priv->nvm_data->valid_tx_ant); 1429 } 1430 1431 start_action = tbl->action; 1432 for (; ;) { 1433 lq_sta->action_counter++; 1434 switch (tbl->action) { 1435 case IWL_LEGACY_SWITCH_ANTENNA1: 1436 case IWL_LEGACY_SWITCH_ANTENNA2: 1437 IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n"); 1438 1439 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 && 1440 tx_chains_num <= 1) || 1441 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 && 1442 tx_chains_num <= 2)) 1443 break; 1444 1445 /* Don't change antenna if success has been great */ 1446 if (window->success_ratio >= IWL_RS_GOOD_RATIO && 1447 !priv->bt_full_concurrent && 1448 priv->bt_traffic_load == 1449 IWL_BT_COEX_TRAFFIC_LOAD_NONE) 1450 break; 1451 1452 /* Set up search table to try other antenna */ 1453 memcpy(search_tbl, tbl, sz); 1454 1455 if (rs_toggle_antenna(valid_tx_ant, 1456 &search_tbl->current_rate, search_tbl)) { 1457 update_search_tbl_counter = 1; 1458 rs_set_expected_tpt_table(lq_sta, search_tbl); 1459 goto out; 1460 } 1461 break; 1462 case IWL_LEGACY_SWITCH_SISO: 1463 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n"); 1464 1465 /* Set up search table to try SISO */ 1466 memcpy(search_tbl, tbl, sz); 1467 search_tbl->is_SGI = 0; 1468 ret = rs_switch_to_siso(priv, lq_sta, conf, sta, 1469 search_tbl, index); 1470 if (!ret) { 1471 lq_sta->action_counter = 0; 1472 goto out; 1473 } 1474 1475 break; 1476 case IWL_LEGACY_SWITCH_MIMO2_AB: 1477 case IWL_LEGACY_SWITCH_MIMO2_AC: 1478 case IWL_LEGACY_SWITCH_MIMO2_BC: 1479 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n"); 1480 1481 /* Set up search table to try MIMO */ 1482 memcpy(search_tbl, tbl, sz); 1483 search_tbl->is_SGI = 0; 1484 1485 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB) 1486 search_tbl->ant_type = ANT_AB; 1487 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC) 1488 search_tbl->ant_type = ANT_AC; 1489 else 1490 search_tbl->ant_type = ANT_BC; 1491 1492 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 1493 break; 1494 1495 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta, 1496 search_tbl, index); 1497 if (!ret) { 1498 lq_sta->action_counter = 0; 1499 goto out; 1500 } 1501 break; 1502 1503 case IWL_LEGACY_SWITCH_MIMO3_ABC: 1504 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n"); 1505 1506 /* Set up search table to try MIMO3 */ 1507 memcpy(search_tbl, tbl, sz); 1508 search_tbl->is_SGI = 0; 1509 1510 search_tbl->ant_type = ANT_ABC; 1511 1512 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 1513 break; 1514 1515 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta, 1516 search_tbl, index); 1517 if (!ret) { 1518 lq_sta->action_counter = 0; 1519 goto out; 1520 } 1521 break; 1522 } 1523 tbl->action++; 1524 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC) 1525 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1; 1526 1527 if (tbl->action == start_action) 1528 break; 1529 1530 } 1531 search_tbl->lq_type = LQ_NONE; 1532 return; 1533 1534out: 1535 lq_sta->search_better_tbl = 1; 1536 tbl->action++; 1537 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC) 1538 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1; 1539 if (update_search_tbl_counter) 1540 search_tbl->action = tbl->action; 1541} 1542 1543/* 1544 * Try to switch to new modulation mode from SISO 1545 */ 1546static void rs_move_siso_to_other(struct iwl_priv *priv, 1547 struct iwl_lq_sta *lq_sta, 1548 struct ieee80211_conf *conf, 1549 struct ieee80211_sta *sta, int index) 1550{ 1551 u8 is_green = lq_sta->is_green; 1552 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1553 struct iwl_scale_tbl_info *search_tbl = 1554 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 1555 struct iwl_rate_scale_data *window = &(tbl->win[index]); 1556 struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap; 1557 u32 sz = (sizeof(struct iwl_scale_tbl_info) - 1558 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); 1559 u8 start_action; 1560 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant; 1561 u8 tx_chains_num = priv->hw_params.tx_chains_num; 1562 u8 update_search_tbl_counter = 0; 1563 int ret; 1564 1565 switch (priv->bt_traffic_load) { 1566 case IWL_BT_COEX_TRAFFIC_LOAD_NONE: 1567 /* nothing */ 1568 break; 1569 case IWL_BT_COEX_TRAFFIC_LOAD_LOW: 1570 /* avoid antenna B unless MIMO */ 1571 if (tbl->action == IWL_SISO_SWITCH_ANTENNA2) 1572 tbl->action = IWL_SISO_SWITCH_MIMO2_AB; 1573 break; 1574 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH: 1575 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS: 1576 /* avoid antenna B and MIMO */ 1577 valid_tx_ant = 1578 first_antenna(priv->nvm_data->valid_tx_ant); 1579 if (tbl->action != IWL_SISO_SWITCH_ANTENNA1) 1580 tbl->action = IWL_SISO_SWITCH_ANTENNA1; 1581 break; 1582 default: 1583 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load); 1584 break; 1585 } 1586 1587 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE && 1588 tbl->action > IWL_SISO_SWITCH_ANTENNA2) { 1589 /* stay in SISO */ 1590 tbl->action = IWL_SISO_SWITCH_ANTENNA1; 1591 } 1592 1593 /* configure as 1x1 if bt full concurrency */ 1594 if (priv->bt_full_concurrent) { 1595 valid_tx_ant = 1596 first_antenna(priv->nvm_data->valid_tx_ant); 1597 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2) 1598 tbl->action = IWL_SISO_SWITCH_ANTENNA1; 1599 } 1600 1601 start_action = tbl->action; 1602 for (;;) { 1603 lq_sta->action_counter++; 1604 switch (tbl->action) { 1605 case IWL_SISO_SWITCH_ANTENNA1: 1606 case IWL_SISO_SWITCH_ANTENNA2: 1607 IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n"); 1608 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 && 1609 tx_chains_num <= 1) || 1610 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 && 1611 tx_chains_num <= 2)) 1612 break; 1613 1614 if (window->success_ratio >= IWL_RS_GOOD_RATIO && 1615 !priv->bt_full_concurrent && 1616 priv->bt_traffic_load == 1617 IWL_BT_COEX_TRAFFIC_LOAD_NONE) 1618 break; 1619 1620 memcpy(search_tbl, tbl, sz); 1621 if (rs_toggle_antenna(valid_tx_ant, 1622 &search_tbl->current_rate, search_tbl)) { 1623 update_search_tbl_counter = 1; 1624 goto out; 1625 } 1626 break; 1627 case IWL_SISO_SWITCH_MIMO2_AB: 1628 case IWL_SISO_SWITCH_MIMO2_AC: 1629 case IWL_SISO_SWITCH_MIMO2_BC: 1630 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n"); 1631 memcpy(search_tbl, tbl, sz); 1632 search_tbl->is_SGI = 0; 1633 1634 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB) 1635 search_tbl->ant_type = ANT_AB; 1636 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC) 1637 search_tbl->ant_type = ANT_AC; 1638 else 1639 search_tbl->ant_type = ANT_BC; 1640 1641 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 1642 break; 1643 1644 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta, 1645 search_tbl, index); 1646 if (!ret) 1647 goto out; 1648 break; 1649 case IWL_SISO_SWITCH_GI: 1650 if (!tbl->is_ht40 && !(ht_cap->cap & 1651 IEEE80211_HT_CAP_SGI_20)) 1652 break; 1653 if (tbl->is_ht40 && !(ht_cap->cap & 1654 IEEE80211_HT_CAP_SGI_40)) 1655 break; 1656 1657 IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n"); 1658 1659 memcpy(search_tbl, tbl, sz); 1660 if (is_green) { 1661 if (!tbl->is_SGI) 1662 break; 1663 else 1664 IWL_ERR(priv, 1665 "SGI was set in GF+SISO\n"); 1666 } 1667 search_tbl->is_SGI = !tbl->is_SGI; 1668 rs_set_expected_tpt_table(lq_sta, search_tbl); 1669 if (tbl->is_SGI) { 1670 s32 tpt = lq_sta->last_tpt / 100; 1671 if (tpt >= search_tbl->expected_tpt[index]) 1672 break; 1673 } 1674 search_tbl->current_rate = 1675 rate_n_flags_from_tbl(priv, search_tbl, 1676 index, is_green); 1677 update_search_tbl_counter = 1; 1678 goto out; 1679 case IWL_SISO_SWITCH_MIMO3_ABC: 1680 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n"); 1681 memcpy(search_tbl, tbl, sz); 1682 search_tbl->is_SGI = 0; 1683 search_tbl->ant_type = ANT_ABC; 1684 1685 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 1686 break; 1687 1688 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta, 1689 search_tbl, index); 1690 if (!ret) 1691 goto out; 1692 break; 1693 } 1694 tbl->action++; 1695 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC) 1696 tbl->action = IWL_SISO_SWITCH_ANTENNA1; 1697 1698 if (tbl->action == start_action) 1699 break; 1700 } 1701 search_tbl->lq_type = LQ_NONE; 1702 return; 1703 1704 out: 1705 lq_sta->search_better_tbl = 1; 1706 tbl->action++; 1707 if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC) 1708 tbl->action = IWL_SISO_SWITCH_ANTENNA1; 1709 if (update_search_tbl_counter) 1710 search_tbl->action = tbl->action; 1711} 1712 1713/* 1714 * Try to switch to new modulation mode from MIMO2 1715 */ 1716static void rs_move_mimo2_to_other(struct iwl_priv *priv, 1717 struct iwl_lq_sta *lq_sta, 1718 struct ieee80211_conf *conf, 1719 struct ieee80211_sta *sta, int index) 1720{ 1721 s8 is_green = lq_sta->is_green; 1722 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1723 struct iwl_scale_tbl_info *search_tbl = 1724 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 1725 struct iwl_rate_scale_data *window = &(tbl->win[index]); 1726 struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap; 1727 u32 sz = (sizeof(struct iwl_scale_tbl_info) - 1728 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); 1729 u8 start_action; 1730 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant; 1731 u8 tx_chains_num = priv->hw_params.tx_chains_num; 1732 u8 update_search_tbl_counter = 0; 1733 int ret; 1734 1735 switch (priv->bt_traffic_load) { 1736 case IWL_BT_COEX_TRAFFIC_LOAD_NONE: 1737 /* nothing */ 1738 break; 1739 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH: 1740 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS: 1741 /* avoid antenna B and MIMO */ 1742 if (tbl->action != IWL_MIMO2_SWITCH_SISO_A) 1743 tbl->action = IWL_MIMO2_SWITCH_SISO_A; 1744 break; 1745 case IWL_BT_COEX_TRAFFIC_LOAD_LOW: 1746 /* avoid antenna B unless MIMO */ 1747 if (tbl->action == IWL_MIMO2_SWITCH_SISO_B || 1748 tbl->action == IWL_MIMO2_SWITCH_SISO_C) 1749 tbl->action = IWL_MIMO2_SWITCH_SISO_A; 1750 break; 1751 default: 1752 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load); 1753 break; 1754 } 1755 1756 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) && 1757 (tbl->action < IWL_MIMO2_SWITCH_SISO_A || 1758 tbl->action > IWL_MIMO2_SWITCH_SISO_C)) { 1759 /* switch in SISO */ 1760 tbl->action = IWL_MIMO2_SWITCH_SISO_A; 1761 } 1762 1763 /* configure as 1x1 if bt full concurrency */ 1764 if (priv->bt_full_concurrent && 1765 (tbl->action < IWL_MIMO2_SWITCH_SISO_A || 1766 tbl->action > IWL_MIMO2_SWITCH_SISO_C)) 1767 tbl->action = IWL_MIMO2_SWITCH_SISO_A; 1768 1769 start_action = tbl->action; 1770 for (;;) { 1771 lq_sta->action_counter++; 1772 switch (tbl->action) { 1773 case IWL_MIMO2_SWITCH_ANTENNA1: 1774 case IWL_MIMO2_SWITCH_ANTENNA2: 1775 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n"); 1776 1777 if (tx_chains_num <= 2) 1778 break; 1779 1780 if (window->success_ratio >= IWL_RS_GOOD_RATIO) 1781 break; 1782 1783 memcpy(search_tbl, tbl, sz); 1784 if (rs_toggle_antenna(valid_tx_ant, 1785 &search_tbl->current_rate, search_tbl)) { 1786 update_search_tbl_counter = 1; 1787 goto out; 1788 } 1789 break; 1790 case IWL_MIMO2_SWITCH_SISO_A: 1791 case IWL_MIMO2_SWITCH_SISO_B: 1792 case IWL_MIMO2_SWITCH_SISO_C: 1793 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n"); 1794 1795 /* Set up new search table for SISO */ 1796 memcpy(search_tbl, tbl, sz); 1797 1798 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A) 1799 search_tbl->ant_type = ANT_A; 1800 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B) 1801 search_tbl->ant_type = ANT_B; 1802 else 1803 search_tbl->ant_type = ANT_C; 1804 1805 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 1806 break; 1807 1808 ret = rs_switch_to_siso(priv, lq_sta, conf, sta, 1809 search_tbl, index); 1810 if (!ret) 1811 goto out; 1812 1813 break; 1814 1815 case IWL_MIMO2_SWITCH_GI: 1816 if (!tbl->is_ht40 && !(ht_cap->cap & 1817 IEEE80211_HT_CAP_SGI_20)) 1818 break; 1819 if (tbl->is_ht40 && !(ht_cap->cap & 1820 IEEE80211_HT_CAP_SGI_40)) 1821 break; 1822 1823 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n"); 1824 1825 /* Set up new search table for MIMO2 */ 1826 memcpy(search_tbl, tbl, sz); 1827 search_tbl->is_SGI = !tbl->is_SGI; 1828 rs_set_expected_tpt_table(lq_sta, search_tbl); 1829 /* 1830 * If active table already uses the fastest possible 1831 * modulation (dual stream with short guard interval), 1832 * and it's working well, there's no need to look 1833 * for a better type of modulation! 1834 */ 1835 if (tbl->is_SGI) { 1836 s32 tpt = lq_sta->last_tpt / 100; 1837 if (tpt >= search_tbl->expected_tpt[index]) 1838 break; 1839 } 1840 search_tbl->current_rate = 1841 rate_n_flags_from_tbl(priv, search_tbl, 1842 index, is_green); 1843 update_search_tbl_counter = 1; 1844 goto out; 1845 1846 case IWL_MIMO2_SWITCH_MIMO3_ABC: 1847 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n"); 1848 memcpy(search_tbl, tbl, sz); 1849 search_tbl->is_SGI = 0; 1850 search_tbl->ant_type = ANT_ABC; 1851 1852 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 1853 break; 1854 1855 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta, 1856 search_tbl, index); 1857 if (!ret) 1858 goto out; 1859 1860 break; 1861 } 1862 tbl->action++; 1863 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC) 1864 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1; 1865 1866 if (tbl->action == start_action) 1867 break; 1868 } 1869 search_tbl->lq_type = LQ_NONE; 1870 return; 1871 out: 1872 lq_sta->search_better_tbl = 1; 1873 tbl->action++; 1874 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC) 1875 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1; 1876 if (update_search_tbl_counter) 1877 search_tbl->action = tbl->action; 1878 1879} 1880 1881/* 1882 * Try to switch to new modulation mode from MIMO3 1883 */ 1884static void rs_move_mimo3_to_other(struct iwl_priv *priv, 1885 struct iwl_lq_sta *lq_sta, 1886 struct ieee80211_conf *conf, 1887 struct ieee80211_sta *sta, int index) 1888{ 1889 s8 is_green = lq_sta->is_green; 1890 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1891 struct iwl_scale_tbl_info *search_tbl = 1892 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 1893 struct iwl_rate_scale_data *window = &(tbl->win[index]); 1894 struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap; 1895 u32 sz = (sizeof(struct iwl_scale_tbl_info) - 1896 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); 1897 u8 start_action; 1898 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant; 1899 u8 tx_chains_num = priv->hw_params.tx_chains_num; 1900 int ret; 1901 u8 update_search_tbl_counter = 0; 1902 1903 switch (priv->bt_traffic_load) { 1904 case IWL_BT_COEX_TRAFFIC_LOAD_NONE: 1905 /* nothing */ 1906 break; 1907 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH: 1908 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS: 1909 /* avoid antenna B and MIMO */ 1910 if (tbl->action != IWL_MIMO3_SWITCH_SISO_A) 1911 tbl->action = IWL_MIMO3_SWITCH_SISO_A; 1912 break; 1913 case IWL_BT_COEX_TRAFFIC_LOAD_LOW: 1914 /* avoid antenna B unless MIMO */ 1915 if (tbl->action == IWL_MIMO3_SWITCH_SISO_B || 1916 tbl->action == IWL_MIMO3_SWITCH_SISO_C) 1917 tbl->action = IWL_MIMO3_SWITCH_SISO_A; 1918 break; 1919 default: 1920 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load); 1921 break; 1922 } 1923 1924 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) && 1925 (tbl->action < IWL_MIMO3_SWITCH_SISO_A || 1926 tbl->action > IWL_MIMO3_SWITCH_SISO_C)) { 1927 /* switch in SISO */ 1928 tbl->action = IWL_MIMO3_SWITCH_SISO_A; 1929 } 1930 1931 /* configure as 1x1 if bt full concurrency */ 1932 if (priv->bt_full_concurrent && 1933 (tbl->action < IWL_MIMO3_SWITCH_SISO_A || 1934 tbl->action > IWL_MIMO3_SWITCH_SISO_C)) 1935 tbl->action = IWL_MIMO3_SWITCH_SISO_A; 1936 1937 start_action = tbl->action; 1938 for (;;) { 1939 lq_sta->action_counter++; 1940 switch (tbl->action) { 1941 case IWL_MIMO3_SWITCH_ANTENNA1: 1942 case IWL_MIMO3_SWITCH_ANTENNA2: 1943 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n"); 1944 1945 if (tx_chains_num <= 3) 1946 break; 1947 1948 if (window->success_ratio >= IWL_RS_GOOD_RATIO) 1949 break; 1950 1951 memcpy(search_tbl, tbl, sz); 1952 if (rs_toggle_antenna(valid_tx_ant, 1953 &search_tbl->current_rate, search_tbl)) 1954 goto out; 1955 break; 1956 case IWL_MIMO3_SWITCH_SISO_A: 1957 case IWL_MIMO3_SWITCH_SISO_B: 1958 case IWL_MIMO3_SWITCH_SISO_C: 1959 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n"); 1960 1961 /* Set up new search table for SISO */ 1962 memcpy(search_tbl, tbl, sz); 1963 1964 if (tbl->action == IWL_MIMO3_SWITCH_SISO_A) 1965 search_tbl->ant_type = ANT_A; 1966 else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B) 1967 search_tbl->ant_type = ANT_B; 1968 else 1969 search_tbl->ant_type = ANT_C; 1970 1971 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 1972 break; 1973 1974 ret = rs_switch_to_siso(priv, lq_sta, conf, sta, 1975 search_tbl, index); 1976 if (!ret) 1977 goto out; 1978 1979 break; 1980 1981 case IWL_MIMO3_SWITCH_MIMO2_AB: 1982 case IWL_MIMO3_SWITCH_MIMO2_AC: 1983 case IWL_MIMO3_SWITCH_MIMO2_BC: 1984 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n"); 1985 1986 memcpy(search_tbl, tbl, sz); 1987 search_tbl->is_SGI = 0; 1988 if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB) 1989 search_tbl->ant_type = ANT_AB; 1990 else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC) 1991 search_tbl->ant_type = ANT_AC; 1992 else 1993 search_tbl->ant_type = ANT_BC; 1994 1995 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 1996 break; 1997 1998 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta, 1999 search_tbl, index); 2000 if (!ret) 2001 goto out; 2002 2003 break; 2004 2005 case IWL_MIMO3_SWITCH_GI: 2006 if (!tbl->is_ht40 && !(ht_cap->cap & 2007 IEEE80211_HT_CAP_SGI_20)) 2008 break; 2009 if (tbl->is_ht40 && !(ht_cap->cap & 2010 IEEE80211_HT_CAP_SGI_40)) 2011 break; 2012 2013 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n"); 2014 2015 /* Set up new search table for MIMO */ 2016 memcpy(search_tbl, tbl, sz); 2017 search_tbl->is_SGI = !tbl->is_SGI; 2018 rs_set_expected_tpt_table(lq_sta, search_tbl); 2019 /* 2020 * If active table already uses the fastest possible 2021 * modulation (dual stream with short guard interval), 2022 * and it's working well, there's no need to look 2023 * for a better type of modulation! 2024 */ 2025 if (tbl->is_SGI) { 2026 s32 tpt = lq_sta->last_tpt / 100; 2027 if (tpt >= search_tbl->expected_tpt[index]) 2028 break; 2029 } 2030 search_tbl->current_rate = 2031 rate_n_flags_from_tbl(priv, search_tbl, 2032 index, is_green); 2033 update_search_tbl_counter = 1; 2034 goto out; 2035 } 2036 tbl->action++; 2037 if (tbl->action > IWL_MIMO3_SWITCH_GI) 2038 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1; 2039 2040 if (tbl->action == start_action) 2041 break; 2042 } 2043 search_tbl->lq_type = LQ_NONE; 2044 return; 2045 out: 2046 lq_sta->search_better_tbl = 1; 2047 tbl->action++; 2048 if (tbl->action > IWL_MIMO3_SWITCH_GI) 2049 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1; 2050 if (update_search_tbl_counter) 2051 search_tbl->action = tbl->action; 2052} 2053 2054/* 2055 * Check whether we should continue using same modulation mode, or 2056 * begin search for a new mode, based on: 2057 * 1) # tx successes or failures while using this mode 2058 * 2) # times calling this function 2059 * 3) elapsed time in this mode (not used, for now) 2060 */ 2061static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search) 2062{ 2063 struct iwl_scale_tbl_info *tbl; 2064 int i; 2065 int active_tbl; 2066 int flush_interval_passed = 0; 2067 struct iwl_priv *priv; 2068 2069 priv = lq_sta->drv; 2070 active_tbl = lq_sta->active_tbl; 2071 2072 tbl = &(lq_sta->lq_info[active_tbl]); 2073 2074 /* If we've been disallowing search, see if we should now allow it */ 2075 if (lq_sta->stay_in_tbl) { 2076 2077 /* Elapsed time using current modulation mode */ 2078 if (lq_sta->flush_timer) 2079 flush_interval_passed = 2080 time_after(jiffies, 2081 (unsigned long)(lq_sta->flush_timer + 2082 IWL_RATE_SCALE_FLUSH_INTVL)); 2083 2084 /* 2085 * Check if we should allow search for new modulation mode. 2086 * If many frames have failed or succeeded, or we've used 2087 * this same modulation for a long time, allow search, and 2088 * reset history stats that keep track of whether we should 2089 * allow a new search. Also (below) reset all bitmaps and 2090 * stats in active history. 2091 */ 2092 if (force_search || 2093 (lq_sta->total_failed > lq_sta->max_failure_limit) || 2094 (lq_sta->total_success > lq_sta->max_success_limit) || 2095 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer) 2096 && (flush_interval_passed))) { 2097 IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n", 2098 lq_sta->total_failed, 2099 lq_sta->total_success, 2100 flush_interval_passed); 2101 2102 /* Allow search for new mode */ 2103 lq_sta->stay_in_tbl = 0; /* only place reset */ 2104 lq_sta->total_failed = 0; 2105 lq_sta->total_success = 0; 2106 lq_sta->flush_timer = 0; 2107 2108 /* 2109 * Else if we've used this modulation mode enough repetitions 2110 * (regardless of elapsed time or success/failure), reset 2111 * history bitmaps and rate-specific stats for all rates in 2112 * active table. 2113 */ 2114 } else { 2115 lq_sta->table_count++; 2116 if (lq_sta->table_count >= 2117 lq_sta->table_count_limit) { 2118 lq_sta->table_count = 0; 2119 2120 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n"); 2121 for (i = 0; i < IWL_RATE_COUNT; i++) 2122 rs_rate_scale_clear_window( 2123 &(tbl->win[i])); 2124 } 2125 } 2126 2127 /* If transitioning to allow "search", reset all history 2128 * bitmaps and stats in active table (this will become the new 2129 * "search" table). */ 2130 if (!lq_sta->stay_in_tbl) { 2131 for (i = 0; i < IWL_RATE_COUNT; i++) 2132 rs_rate_scale_clear_window(&(tbl->win[i])); 2133 } 2134 } 2135} 2136 2137/* 2138 * setup rate table in uCode 2139 */ 2140static void rs_update_rate_tbl(struct iwl_priv *priv, 2141 struct iwl_rxon_context *ctx, 2142 struct iwl_lq_sta *lq_sta, 2143 struct iwl_scale_tbl_info *tbl, 2144 int index, u8 is_green) 2145{ 2146 u32 rate; 2147 2148 /* Update uCode's rate table. */ 2149 rate = rate_n_flags_from_tbl(priv, tbl, index, is_green); 2150 rs_fill_link_cmd(priv, lq_sta, rate); 2151 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false); 2152} 2153 2154/* 2155 * Do rate scaling and search for new modulation mode. 2156 */ 2157static void rs_rate_scale_perform(struct iwl_priv *priv, 2158 struct sk_buff *skb, 2159 struct ieee80211_sta *sta, 2160 struct iwl_lq_sta *lq_sta) 2161{ 2162 struct ieee80211_hw *hw = priv->hw; 2163 struct ieee80211_conf *conf = &hw->conf; 2164 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2165 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 2166 int low = IWL_RATE_INVALID; 2167 int high = IWL_RATE_INVALID; 2168 int index; 2169 int i; 2170 struct iwl_rate_scale_data *window = NULL; 2171 int current_tpt = IWL_INVALID_VALUE; 2172 int low_tpt = IWL_INVALID_VALUE; 2173 int high_tpt = IWL_INVALID_VALUE; 2174 u32 fail_count; 2175 s8 scale_action = 0; 2176 u16 rate_mask; 2177 u8 update_lq = 0; 2178 struct iwl_scale_tbl_info *tbl, *tbl1; 2179 u16 rate_scale_index_msk = 0; 2180 u8 is_green = 0; 2181 u8 active_tbl = 0; 2182 u8 done_search = 0; 2183 u16 high_low; 2184 s32 sr; 2185 u8 tid = IWL_MAX_TID_COUNT; 2186 struct iwl_tid_data *tid_data; 2187 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv; 2188 struct iwl_rxon_context *ctx = sta_priv->ctx; 2189 2190 IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n"); 2191 2192 /* Send management frames and NO_ACK data using lowest rate. */ 2193 /* TODO: this could probably be improved.. */ 2194 if (!ieee80211_is_data(hdr->frame_control) || 2195 info->flags & IEEE80211_TX_CTL_NO_ACK) 2196 return; 2197 2198 lq_sta->supp_rates = sta->deflink.supp_rates[lq_sta->band]; 2199 2200 tid = rs_tl_add_packet(lq_sta, hdr); 2201 if ((tid != IWL_MAX_TID_COUNT) && 2202 (lq_sta->tx_agg_tid_en & (1 << tid))) { 2203 tid_data = &priv->tid_data[lq_sta->lq.sta_id][tid]; 2204 if (tid_data->agg.state == IWL_AGG_OFF) 2205 lq_sta->is_agg = 0; 2206 else 2207 lq_sta->is_agg = 1; 2208 } else 2209 lq_sta->is_agg = 0; 2210 2211 /* 2212 * Select rate-scale / modulation-mode table to work with in 2213 * the rest of this function: "search" if searching for better 2214 * modulation mode, or "active" if doing rate scaling within a mode. 2215 */ 2216 if (!lq_sta->search_better_tbl) 2217 active_tbl = lq_sta->active_tbl; 2218 else 2219 active_tbl = 1 - lq_sta->active_tbl; 2220 2221 tbl = &(lq_sta->lq_info[active_tbl]); 2222 if (is_legacy(tbl->lq_type)) 2223 lq_sta->is_green = 0; 2224 else 2225 lq_sta->is_green = rs_use_green(sta); 2226 is_green = lq_sta->is_green; 2227 2228 /* current tx rate */ 2229 index = lq_sta->last_txrate_idx; 2230 2231 IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index, 2232 tbl->lq_type); 2233 2234 /* rates available for this association, and for modulation mode */ 2235 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type); 2236 2237 IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask); 2238 2239 /* mask with station rate restriction */ 2240 if (is_legacy(tbl->lq_type)) { 2241 if (lq_sta->band == NL80211_BAND_5GHZ) 2242 /* supp_rates has no CCK bits in A mode */ 2243 rate_scale_index_msk = (u16) (rate_mask & 2244 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE)); 2245 else 2246 rate_scale_index_msk = (u16) (rate_mask & 2247 lq_sta->supp_rates); 2248 2249 } else 2250 rate_scale_index_msk = rate_mask; 2251 2252 if (!rate_scale_index_msk) 2253 rate_scale_index_msk = rate_mask; 2254 2255 if (!((1 << index) & rate_scale_index_msk)) { 2256 IWL_ERR(priv, "Current Rate is not valid\n"); 2257 if (lq_sta->search_better_tbl) { 2258 /* revert to active table if search table is not valid*/ 2259 tbl->lq_type = LQ_NONE; 2260 lq_sta->search_better_tbl = 0; 2261 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 2262 /* get "active" rate info */ 2263 index = iwl_hwrate_to_plcp_idx(tbl->current_rate); 2264 rs_update_rate_tbl(priv, ctx, lq_sta, tbl, 2265 index, is_green); 2266 } 2267 return; 2268 } 2269 2270 /* Get expected throughput table and history window for current rate */ 2271 if (!tbl->expected_tpt) { 2272 IWL_ERR(priv, "tbl->expected_tpt is NULL\n"); 2273 return; 2274 } 2275 2276 /* force user max rate if set by user */ 2277 if ((lq_sta->max_rate_idx != -1) && 2278 (lq_sta->max_rate_idx < index)) { 2279 index = lq_sta->max_rate_idx; 2280 update_lq = 1; 2281 window = &(tbl->win[index]); 2282 goto lq_update; 2283 } 2284 2285 window = &(tbl->win[index]); 2286 2287 /* 2288 * If there is not enough history to calculate actual average 2289 * throughput, keep analyzing results of more tx frames, without 2290 * changing rate or mode (bypass most of the rest of this function). 2291 * Set up new rate table in uCode only if old rate is not supported 2292 * in current association (use new rate found above). 2293 */ 2294 fail_count = window->counter - window->success_counter; 2295 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) && 2296 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) { 2297 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d " 2298 "for index %d\n", 2299 window->success_counter, window->counter, index); 2300 2301 /* Can't calculate this yet; not enough history */ 2302 window->average_tpt = IWL_INVALID_VALUE; 2303 2304 /* Should we stay with this modulation mode, 2305 * or search for a new one? */ 2306 rs_stay_in_table(lq_sta, false); 2307 2308 goto out; 2309 } 2310 /* Else we have enough samples; calculate estimate of 2311 * actual average throughput */ 2312 if (window->average_tpt != ((window->success_ratio * 2313 tbl->expected_tpt[index] + 64) / 128)) { 2314 IWL_ERR(priv, "expected_tpt should have been calculated by now\n"); 2315 window->average_tpt = ((window->success_ratio * 2316 tbl->expected_tpt[index] + 64) / 128); 2317 } 2318 2319 /* If we are searching for better modulation mode, check success. */ 2320 if (lq_sta->search_better_tbl && 2321 (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) { 2322 /* If good success, continue using the "search" mode; 2323 * no need to send new link quality command, since we're 2324 * continuing to use the setup that we've been trying. */ 2325 if (window->average_tpt > lq_sta->last_tpt) { 2326 2327 IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE " 2328 "suc=%d cur-tpt=%d old-tpt=%d\n", 2329 window->success_ratio, 2330 window->average_tpt, 2331 lq_sta->last_tpt); 2332 2333 if (!is_legacy(tbl->lq_type)) 2334 lq_sta->enable_counter = 1; 2335 2336 /* Swap tables; "search" becomes "active" */ 2337 lq_sta->active_tbl = active_tbl; 2338 current_tpt = window->average_tpt; 2339 2340 /* Else poor success; go back to mode in "active" table */ 2341 } else { 2342 2343 IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE " 2344 "suc=%d cur-tpt=%d old-tpt=%d\n", 2345 window->success_ratio, 2346 window->average_tpt, 2347 lq_sta->last_tpt); 2348 2349 /* Nullify "search" table */ 2350 tbl->lq_type = LQ_NONE; 2351 2352 /* Revert to "active" table */ 2353 active_tbl = lq_sta->active_tbl; 2354 tbl = &(lq_sta->lq_info[active_tbl]); 2355 2356 /* Revert to "active" rate and throughput info */ 2357 index = iwl_hwrate_to_plcp_idx(tbl->current_rate); 2358 current_tpt = lq_sta->last_tpt; 2359 2360 /* Need to set up a new rate table in uCode */ 2361 update_lq = 1; 2362 } 2363 2364 /* Either way, we've made a decision; modulation mode 2365 * search is done, allow rate adjustment next time. */ 2366 lq_sta->search_better_tbl = 0; 2367 done_search = 1; /* Don't switch modes below! */ 2368 goto lq_update; 2369 } 2370 2371 /* (Else) not in search of better modulation mode, try for better 2372 * starting rate, while staying in this mode. */ 2373 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk, 2374 tbl->lq_type); 2375 low = high_low & 0xff; 2376 high = (high_low >> 8) & 0xff; 2377 2378 /* If user set max rate, dont allow higher than user constrain */ 2379 if ((lq_sta->max_rate_idx != -1) && 2380 (lq_sta->max_rate_idx < high)) 2381 high = IWL_RATE_INVALID; 2382 2383 sr = window->success_ratio; 2384 2385 /* Collect measured throughputs for current and adjacent rates */ 2386 current_tpt = window->average_tpt; 2387 if (low != IWL_RATE_INVALID) 2388 low_tpt = tbl->win[low].average_tpt; 2389 if (high != IWL_RATE_INVALID) 2390 high_tpt = tbl->win[high].average_tpt; 2391 2392 scale_action = 0; 2393 2394 /* Too many failures, decrease rate */ 2395 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) { 2396 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n"); 2397 scale_action = -1; 2398 2399 /* No throughput measured yet for adjacent rates; try increase. */ 2400 } else if ((low_tpt == IWL_INVALID_VALUE) && 2401 (high_tpt == IWL_INVALID_VALUE)) { 2402 2403 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH) 2404 scale_action = 1; 2405 else if (low != IWL_RATE_INVALID) 2406 scale_action = 0; 2407 } 2408 2409 /* Both adjacent throughputs are measured, but neither one has better 2410 * throughput; we're using the best rate, don't change it! */ 2411 else if ((low_tpt != IWL_INVALID_VALUE) && 2412 (high_tpt != IWL_INVALID_VALUE) && 2413 (low_tpt < current_tpt) && 2414 (high_tpt < current_tpt)) 2415 scale_action = 0; 2416 2417 /* At least one adjacent rate's throughput is measured, 2418 * and may have better performance. */ 2419 else { 2420 /* Higher adjacent rate's throughput is measured */ 2421 if (high_tpt != IWL_INVALID_VALUE) { 2422 /* Higher rate has better throughput */ 2423 if (high_tpt > current_tpt && 2424 sr >= IWL_RATE_INCREASE_TH) { 2425 scale_action = 1; 2426 } else { 2427 scale_action = 0; 2428 } 2429 2430 /* Lower adjacent rate's throughput is measured */ 2431 } else if (low_tpt != IWL_INVALID_VALUE) { 2432 /* Lower rate has better throughput */ 2433 if (low_tpt > current_tpt) { 2434 IWL_DEBUG_RATE(priv, 2435 "decrease rate because of low tpt\n"); 2436 scale_action = -1; 2437 } else if (sr >= IWL_RATE_INCREASE_TH) { 2438 scale_action = 1; 2439 } 2440 } 2441 } 2442 2443 /* Sanity check; asked for decrease, but success rate or throughput 2444 * has been good at old rate. Don't change it. */ 2445 if ((scale_action == -1) && (low != IWL_RATE_INVALID) && 2446 ((sr > IWL_RATE_HIGH_TH) || 2447 (current_tpt > (100 * tbl->expected_tpt[low])))) 2448 scale_action = 0; 2449 if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type)) 2450 scale_action = -1; 2451 if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI && 2452 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) 2453 scale_action = -1; 2454 2455 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) && 2456 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) { 2457 if (lq_sta->last_bt_traffic > priv->bt_traffic_load) { 2458 /* 2459 * don't set scale_action, don't want to scale up if 2460 * the rate scale doesn't otherwise think that is a 2461 * good idea. 2462 */ 2463 } else if (lq_sta->last_bt_traffic <= priv->bt_traffic_load) { 2464 scale_action = -1; 2465 } 2466 } 2467 lq_sta->last_bt_traffic = priv->bt_traffic_load; 2468 2469 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) && 2470 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) { 2471 /* search for a new modulation */ 2472 rs_stay_in_table(lq_sta, true); 2473 goto lq_update; 2474 } 2475 2476 switch (scale_action) { 2477 case -1: 2478 /* Decrease starting rate, update uCode's rate table */ 2479 if (low != IWL_RATE_INVALID) { 2480 update_lq = 1; 2481 index = low; 2482 } 2483 2484 break; 2485 case 1: 2486 /* Increase starting rate, update uCode's rate table */ 2487 if (high != IWL_RATE_INVALID) { 2488 update_lq = 1; 2489 index = high; 2490 } 2491 2492 break; 2493 case 0: 2494 /* No change */ 2495 default: 2496 break; 2497 } 2498 2499 IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d " 2500 "high %d type %d\n", 2501 index, scale_action, low, high, tbl->lq_type); 2502 2503lq_update: 2504 /* Replace uCode's rate table for the destination station. */ 2505 if (update_lq) 2506 rs_update_rate_tbl(priv, ctx, lq_sta, tbl, index, is_green); 2507 2508 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) { 2509 /* Should we stay with this modulation mode, 2510 * or search for a new one? */ 2511 rs_stay_in_table(lq_sta, false); 2512 } 2513 /* 2514 * Search for new modulation mode if we're: 2515 * 1) Not changing rates right now 2516 * 2) Not just finishing up a search 2517 * 3) Allowing a new search 2518 */ 2519 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) { 2520 /* Save current throughput to compare with "search" throughput*/ 2521 lq_sta->last_tpt = current_tpt; 2522 2523 /* Select a new "search" modulation mode to try. 2524 * If one is found, set up the new "search" table. */ 2525 if (is_legacy(tbl->lq_type)) 2526 rs_move_legacy_other(priv, lq_sta, conf, sta, index); 2527 else if (is_siso(tbl->lq_type)) 2528 rs_move_siso_to_other(priv, lq_sta, conf, sta, index); 2529 else if (is_mimo2(tbl->lq_type)) 2530 rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index); 2531 else 2532 rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index); 2533 2534 /* If new "search" mode was selected, set up in uCode table */ 2535 if (lq_sta->search_better_tbl) { 2536 /* Access the "search" table, clear its history. */ 2537 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 2538 for (i = 0; i < IWL_RATE_COUNT; i++) 2539 rs_rate_scale_clear_window(&(tbl->win[i])); 2540 2541 /* Use new "search" start rate */ 2542 index = iwl_hwrate_to_plcp_idx(tbl->current_rate); 2543 2544 IWL_DEBUG_RATE(priv, "Switch current mcs: %X index: %d\n", 2545 tbl->current_rate, index); 2546 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate); 2547 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false); 2548 } else 2549 done_search = 1; 2550 } 2551 2552 if (done_search && !lq_sta->stay_in_tbl) { 2553 /* If the "active" (non-search) mode was legacy, 2554 * and we've tried switching antennas, 2555 * but we haven't been able to try HT modes (not available), 2556 * stay with best antenna legacy modulation for a while 2557 * before next round of mode comparisons. */ 2558 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]); 2559 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) && 2560 lq_sta->action_counter > tbl1->max_search) { 2561 IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n"); 2562 rs_set_stay_in_table(priv, 1, lq_sta); 2563 } 2564 2565 /* If we're in an HT mode, and all 3 mode switch actions 2566 * have been tried and compared, stay in this best modulation 2567 * mode for a while before next round of mode comparisons. */ 2568 if (lq_sta->enable_counter && 2569 (lq_sta->action_counter >= tbl1->max_search) && 2570 iwl_ht_enabled(priv)) { 2571 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) && 2572 (lq_sta->tx_agg_tid_en & (1 << tid)) && 2573 (tid != IWL_MAX_TID_COUNT)) { 2574 u8 sta_id = lq_sta->lq.sta_id; 2575 tid_data = &priv->tid_data[sta_id][tid]; 2576 if (tid_data->agg.state == IWL_AGG_OFF) { 2577 IWL_DEBUG_RATE(priv, 2578 "try to aggregate tid %d\n", 2579 tid); 2580 rs_tl_turn_on_agg(priv, tid, 2581 lq_sta, sta); 2582 } 2583 } 2584 rs_set_stay_in_table(priv, 0, lq_sta); 2585 } 2586 } 2587 2588out: 2589 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green); 2590 lq_sta->last_txrate_idx = index; 2591} 2592 2593/* 2594 * rs_initialize_lq - Initialize a station's hardware rate table 2595 * 2596 * The uCode's station table contains a table of fallback rates 2597 * for automatic fallback during transmission. 2598 * 2599 * NOTE: This sets up a default set of values. These will be replaced later 2600 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of 2601 * rc80211_simple. 2602 * 2603 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before 2604 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD, 2605 * which requires station table entry to exist). 2606 */ 2607static void rs_initialize_lq(struct iwl_priv *priv, 2608 struct ieee80211_sta *sta, 2609 struct iwl_lq_sta *lq_sta) 2610{ 2611 struct iwl_scale_tbl_info *tbl; 2612 int rate_idx; 2613 int i; 2614 u32 rate; 2615 u8 use_green = rs_use_green(sta); 2616 u8 active_tbl = 0; 2617 u8 valid_tx_ant; 2618 struct iwl_station_priv *sta_priv; 2619 struct iwl_rxon_context *ctx; 2620 2621 if (!sta || !lq_sta) 2622 return; 2623 2624 sta_priv = (void *)sta->drv_priv; 2625 ctx = sta_priv->ctx; 2626 2627 i = lq_sta->last_txrate_idx; 2628 2629 valid_tx_ant = priv->nvm_data->valid_tx_ant; 2630 2631 if (!lq_sta->search_better_tbl) 2632 active_tbl = lq_sta->active_tbl; 2633 else 2634 active_tbl = 1 - lq_sta->active_tbl; 2635 2636 tbl = &(lq_sta->lq_info[active_tbl]); 2637 2638 if ((i < 0) || (i >= IWL_RATE_COUNT)) 2639 i = 0; 2640 2641 rate = iwl_rates[i].plcp; 2642 tbl->ant_type = first_antenna(valid_tx_ant); 2643 rate |= tbl->ant_type << RATE_MCS_ANT_POS; 2644 2645 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE) 2646 rate |= RATE_MCS_CCK_MSK; 2647 2648 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx); 2649 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type)) 2650 rs_toggle_antenna(valid_tx_ant, &rate, tbl); 2651 2652 rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green); 2653 tbl->current_rate = rate; 2654 rs_set_expected_tpt_table(lq_sta, tbl); 2655 rs_fill_link_cmd(NULL, lq_sta, rate); 2656 priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq; 2657 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, 0, true); 2658} 2659 2660static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta, 2661 struct ieee80211_tx_rate_control *txrc) 2662{ 2663 2664 struct sk_buff *skb = txrc->skb; 2665 struct ieee80211_supported_band *sband = txrc->sband; 2666 struct iwl_op_mode *op_mode __maybe_unused = 2667 (struct iwl_op_mode *)priv_r; 2668 struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode); 2669 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2670 struct iwl_lq_sta *lq_sta = priv_sta; 2671 int rate_idx; 2672 2673 IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n"); 2674 2675 /* Get max rate if user set max rate */ 2676 if (lq_sta) { 2677 lq_sta->max_rate_idx = fls(txrc->rate_idx_mask) - 1; 2678 if ((sband->band == NL80211_BAND_5GHZ) && 2679 (lq_sta->max_rate_idx != -1)) 2680 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE; 2681 if ((lq_sta->max_rate_idx < 0) || 2682 (lq_sta->max_rate_idx >= IWL_RATE_COUNT)) 2683 lq_sta->max_rate_idx = -1; 2684 } 2685 2686 /* Treat uninitialized rate scaling data same as non-existing. */ 2687 if (lq_sta && !lq_sta->drv) { 2688 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n"); 2689 priv_sta = NULL; 2690 } 2691 2692 rate_idx = lq_sta->last_txrate_idx; 2693 2694 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) { 2695 rate_idx -= IWL_FIRST_OFDM_RATE; 2696 /* 6M and 9M shared same MCS index */ 2697 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0; 2698 if (rs_extract_rate(lq_sta->last_rate_n_flags) >= 2699 IWL_RATE_MIMO3_6M_PLCP) 2700 rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM); 2701 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >= 2702 IWL_RATE_MIMO2_6M_PLCP) 2703 rate_idx = rate_idx + MCS_INDEX_PER_STREAM; 2704 info->control.rates[0].flags = IEEE80211_TX_RC_MCS; 2705 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK) 2706 info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI; 2707 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK) 2708 info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA; 2709 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK) 2710 info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2711 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK) 2712 info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD; 2713 } else { 2714 /* Check for invalid rates */ 2715 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) || 2716 ((sband->band == NL80211_BAND_5GHZ) && 2717 (rate_idx < IWL_FIRST_OFDM_RATE))) 2718 rate_idx = rate_lowest_index(sband, sta); 2719 /* On valid 5 GHz rate, adjust index */ 2720 else if (sband->band == NL80211_BAND_5GHZ) 2721 rate_idx -= IWL_FIRST_OFDM_RATE; 2722 info->control.rates[0].flags = 0; 2723 } 2724 info->control.rates[0].idx = rate_idx; 2725 info->control.rates[0].count = 1; 2726} 2727 2728static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta, 2729 gfp_t gfp) 2730{ 2731 struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv; 2732 struct iwl_op_mode *op_mode __maybe_unused = 2733 (struct iwl_op_mode *)priv_rate; 2734 struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode); 2735 2736 IWL_DEBUG_RATE(priv, "create station rate scale window\n"); 2737 2738 return &sta_priv->lq_sta; 2739} 2740 2741/* 2742 * Called after adding a new station to initialize rate scaling 2743 */ 2744void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id) 2745{ 2746 int i, j; 2747 struct ieee80211_hw *hw = priv->hw; 2748 struct ieee80211_conf *conf = &priv->hw->conf; 2749 struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap; 2750 struct iwl_station_priv *sta_priv; 2751 struct iwl_lq_sta *lq_sta; 2752 struct ieee80211_supported_band *sband; 2753 unsigned long supp; /* must be unsigned long for for_each_set_bit */ 2754 2755 sta_priv = (struct iwl_station_priv *) sta->drv_priv; 2756 lq_sta = &sta_priv->lq_sta; 2757 sband = hw->wiphy->bands[conf->chandef.chan->band]; 2758 2759 2760 lq_sta->lq.sta_id = sta_id; 2761 2762 for (j = 0; j < LQ_SIZE; j++) 2763 for (i = 0; i < IWL_RATE_COUNT; i++) 2764 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]); 2765 2766 lq_sta->flush_timer = 0; 2767 lq_sta->supp_rates = sta->deflink.supp_rates[sband->band]; 2768 2769 IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n", 2770 sta_id); 2771 /* TODO: what is a good starting rate for STA? About middle? Maybe not 2772 * the lowest or the highest rate.. Could consider using RSSI from 2773 * previous packets? Need to have IEEE 802.1X auth succeed immediately 2774 * after assoc.. */ 2775 2776 lq_sta->is_dup = 0; 2777 lq_sta->max_rate_idx = -1; 2778 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX; 2779 lq_sta->is_green = rs_use_green(sta); 2780 lq_sta->band = sband->band; 2781 /* 2782 * active legacy rates as per supported rates bitmap 2783 */ 2784 supp = sta->deflink.supp_rates[sband->band]; 2785 lq_sta->active_legacy_rate = 0; 2786 for_each_set_bit(i, &supp, BITS_PER_LONG) 2787 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value); 2788 2789 /* 2790 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3), 2791 * supp_rates[] does not; shift to convert format, force 9 MBits off. 2792 */ 2793 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1; 2794 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1; 2795 lq_sta->active_siso_rate &= ~((u16)0x2); 2796 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE; 2797 2798 /* Same here */ 2799 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1; 2800 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1; 2801 lq_sta->active_mimo2_rate &= ~((u16)0x2); 2802 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE; 2803 2804 lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1; 2805 lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1; 2806 lq_sta->active_mimo3_rate &= ~((u16)0x2); 2807 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE; 2808 2809 IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n", 2810 lq_sta->active_siso_rate, 2811 lq_sta->active_mimo2_rate, 2812 lq_sta->active_mimo3_rate); 2813 2814 /* These values will be overridden later */ 2815 lq_sta->lq.general_params.single_stream_ant_msk = 2816 first_antenna(priv->nvm_data->valid_tx_ant); 2817 lq_sta->lq.general_params.dual_stream_ant_msk = 2818 priv->nvm_data->valid_tx_ant & 2819 ~first_antenna(priv->nvm_data->valid_tx_ant); 2820 if (!lq_sta->lq.general_params.dual_stream_ant_msk) { 2821 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB; 2822 } else if (num_of_ant(priv->nvm_data->valid_tx_ant) == 2) { 2823 lq_sta->lq.general_params.dual_stream_ant_msk = 2824 priv->nvm_data->valid_tx_ant; 2825 } 2826 2827 /* as default allow aggregation for all tids */ 2828 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID; 2829 lq_sta->drv = priv; 2830 2831 /* Set last_txrate_idx to lowest rate */ 2832 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta); 2833 if (sband->band == NL80211_BAND_5GHZ) 2834 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE; 2835 lq_sta->is_agg = 0; 2836#ifdef CONFIG_MAC80211_DEBUGFS 2837 lq_sta->dbg_fixed_rate = 0; 2838#endif 2839 2840 rs_initialize_lq(priv, sta, lq_sta); 2841} 2842 2843static void rs_fill_link_cmd(struct iwl_priv *priv, 2844 struct iwl_lq_sta *lq_sta, u32 new_rate) 2845{ 2846 struct iwl_scale_tbl_info tbl_type; 2847 int index = 0; 2848 int rate_idx; 2849 int repeat_rate = 0; 2850 u8 ant_toggle_cnt = 0; 2851 u8 use_ht_possible = 1; 2852 u8 valid_tx_ant = 0; 2853 struct iwl_station_priv *sta_priv = 2854 container_of(lq_sta, struct iwl_station_priv, lq_sta); 2855 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq; 2856 2857 /* Override starting rate (index 0) if needed for debug purposes */ 2858 rs_dbgfs_set_mcs(lq_sta, &new_rate, index); 2859 2860 /* Interpret new_rate (rate_n_flags) */ 2861 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, 2862 &tbl_type, &rate_idx); 2863 2864 if (priv && priv->bt_full_concurrent) { 2865 /* 1x1 only */ 2866 tbl_type.ant_type = 2867 first_antenna(priv->nvm_data->valid_tx_ant); 2868 } 2869 2870 /* How many times should we repeat the initial rate? */ 2871 if (is_legacy(tbl_type.lq_type)) { 2872 ant_toggle_cnt = 1; 2873 repeat_rate = IWL_NUMBER_TRY; 2874 } else { 2875 repeat_rate = min(IWL_HT_NUMBER_TRY, 2876 LINK_QUAL_AGG_DISABLE_START_DEF - 1); 2877 } 2878 2879 lq_cmd->general_params.mimo_delimiter = 2880 is_mimo(tbl_type.lq_type) ? 1 : 0; 2881 2882 /* Fill 1st table entry (index 0) */ 2883 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate); 2884 2885 if (num_of_ant(tbl_type.ant_type) == 1) { 2886 lq_cmd->general_params.single_stream_ant_msk = 2887 tbl_type.ant_type; 2888 } else if (num_of_ant(tbl_type.ant_type) == 2) { 2889 lq_cmd->general_params.dual_stream_ant_msk = 2890 tbl_type.ant_type; 2891 } /* otherwise we don't modify the existing value */ 2892 2893 index++; 2894 repeat_rate--; 2895 if (priv) { 2896 if (priv->bt_full_concurrent) 2897 valid_tx_ant = ANT_A; 2898 else 2899 valid_tx_ant = priv->nvm_data->valid_tx_ant; 2900 } 2901 2902 /* Fill rest of rate table */ 2903 while (index < LINK_QUAL_MAX_RETRY_NUM) { 2904 /* Repeat initial/next rate. 2905 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute. 2906 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */ 2907 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) { 2908 if (is_legacy(tbl_type.lq_type)) { 2909 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE) 2910 ant_toggle_cnt++; 2911 else if (priv && 2912 rs_toggle_antenna(valid_tx_ant, 2913 &new_rate, &tbl_type)) 2914 ant_toggle_cnt = 1; 2915 } 2916 2917 /* Override next rate if needed for debug purposes */ 2918 rs_dbgfs_set_mcs(lq_sta, &new_rate, index); 2919 2920 /* Fill next table entry */ 2921 lq_cmd->rs_table[index].rate_n_flags = 2922 cpu_to_le32(new_rate); 2923 repeat_rate--; 2924 index++; 2925 } 2926 2927 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type, 2928 &rate_idx); 2929 2930 if (priv && priv->bt_full_concurrent) { 2931 /* 1x1 only */ 2932 tbl_type.ant_type = 2933 first_antenna(priv->nvm_data->valid_tx_ant); 2934 } 2935 2936 /* Indicate to uCode which entries might be MIMO. 2937 * If initial rate was MIMO, this will finally end up 2938 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */ 2939 if (is_mimo(tbl_type.lq_type)) 2940 lq_cmd->general_params.mimo_delimiter = index; 2941 2942 /* Get next rate */ 2943 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx, 2944 use_ht_possible); 2945 2946 /* How many times should we repeat the next rate? */ 2947 if (is_legacy(tbl_type.lq_type)) { 2948 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE) 2949 ant_toggle_cnt++; 2950 else if (priv && 2951 rs_toggle_antenna(valid_tx_ant, 2952 &new_rate, &tbl_type)) 2953 ant_toggle_cnt = 1; 2954 2955 repeat_rate = IWL_NUMBER_TRY; 2956 } else { 2957 repeat_rate = IWL_HT_NUMBER_TRY; 2958 } 2959 2960 /* Don't allow HT rates after next pass. 2961 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */ 2962 use_ht_possible = 0; 2963 2964 /* Override next rate if needed for debug purposes */ 2965 rs_dbgfs_set_mcs(lq_sta, &new_rate, index); 2966 2967 /* Fill next table entry */ 2968 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate); 2969 2970 index++; 2971 repeat_rate--; 2972 } 2973 2974 lq_cmd->agg_params.agg_frame_cnt_limit = 2975 sta_priv->max_agg_bufsize ?: LINK_QUAL_AGG_FRAME_LIMIT_DEF; 2976 lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF; 2977 2978 lq_cmd->agg_params.agg_time_limit = 2979 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF); 2980 /* 2981 * overwrite if needed, pass aggregation time limit 2982 * to uCode in uSec 2983 */ 2984 if (priv && priv->lib->bt_params && 2985 priv->lib->bt_params->agg_time_limit && 2986 priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) 2987 lq_cmd->agg_params.agg_time_limit = 2988 cpu_to_le16(priv->lib->bt_params->agg_time_limit); 2989} 2990 2991static void *rs_alloc(struct ieee80211_hw *hw) 2992{ 2993 return hw->priv; 2994} 2995/* rate scale requires free function to be implemented */ 2996static void rs_free(void *priv_rate) 2997{ 2998 return; 2999} 3000 3001static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta, 3002 void *priv_sta) 3003{ 3004 struct iwl_op_mode *op_mode __maybe_unused = priv_r; 3005 struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode); 3006 3007 IWL_DEBUG_RATE(priv, "enter\n"); 3008 IWL_DEBUG_RATE(priv, "leave\n"); 3009} 3010 3011#ifdef CONFIG_MAC80211_DEBUGFS 3012static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta, 3013 u32 *rate_n_flags, int index) 3014{ 3015 struct iwl_priv *priv; 3016 u8 valid_tx_ant; 3017 u8 ant_sel_tx; 3018 3019 priv = lq_sta->drv; 3020 valid_tx_ant = priv->nvm_data->valid_tx_ant; 3021 if (lq_sta->dbg_fixed_rate) { 3022 ant_sel_tx = 3023 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK) 3024 >> RATE_MCS_ANT_POS); 3025 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) { 3026 *rate_n_flags = lq_sta->dbg_fixed_rate; 3027 IWL_DEBUG_RATE(priv, "Fixed rate ON\n"); 3028 } else { 3029 lq_sta->dbg_fixed_rate = 0; 3030 IWL_ERR(priv, 3031 "Invalid antenna selection 0x%X, Valid is 0x%X\n", 3032 ant_sel_tx, valid_tx_ant); 3033 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n"); 3034 } 3035 } else { 3036 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n"); 3037 } 3038} 3039 3040static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file, 3041 const char __user *user_buf, size_t count, loff_t *ppos) 3042{ 3043 struct iwl_lq_sta *lq_sta = file->private_data; 3044 struct iwl_priv *priv; 3045 char buf[64]; 3046 size_t buf_size; 3047 u32 parsed_rate; 3048 3049 3050 priv = lq_sta->drv; 3051 memset(buf, 0, sizeof(buf)); 3052 buf_size = min(count, sizeof(buf) - 1); 3053 if (copy_from_user(buf, user_buf, buf_size)) 3054 return -EFAULT; 3055 3056 if (sscanf(buf, "%x", &parsed_rate) == 1) 3057 lq_sta->dbg_fixed_rate = parsed_rate; 3058 else 3059 lq_sta->dbg_fixed_rate = 0; 3060 3061 rs_program_fix_rate(priv, lq_sta); 3062 3063 return count; 3064} 3065 3066static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file, 3067 char __user *user_buf, size_t count, loff_t *ppos) 3068{ 3069 char *buff; 3070 int desc = 0; 3071 int i = 0; 3072 int index = 0; 3073 ssize_t ret; 3074 3075 /* mbps, mcs */ 3076 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = { 3077 { "1", "BPSK DSSS"}, 3078 { "2", "QPSK DSSS"}, 3079 {"5.5", "BPSK CCK"}, 3080 { "11", "QPSK CCK"}, 3081 { "6", "BPSK 1/2"}, 3082 { "9", "BPSK 1/2"}, 3083 { "12", "QPSK 1/2"}, 3084 { "18", "QPSK 3/4"}, 3085 { "24", "16QAM 1/2"}, 3086 { "36", "16QAM 3/4"}, 3087 { "48", "64QAM 2/3"}, 3088 { "54", "64QAM 3/4"}, 3089 { "60", "64QAM 5/6"}, 3090 }; 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 (index == IWL_RATE_INVALID) { 3150 desc += sprintf(buff + desc, " rate[%d] 0x%X invalid rate\n", 3151 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags)); 3152 } else if (is_legacy(tbl->lq_type)) { 3153 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n", 3154 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags), 3155 iwl_rate_mcs[index].mbps); 3156 } else { 3157 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n", 3158 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags), 3159 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs); 3160 } 3161 } 3162 3163 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3164 kfree(buff); 3165 return ret; 3166} 3167 3168static const struct file_operations rs_sta_dbgfs_scale_table_ops = { 3169 .write = rs_sta_dbgfs_scale_table_write, 3170 .read = rs_sta_dbgfs_scale_table_read, 3171 .open = simple_open, 3172 .llseek = default_llseek, 3173}; 3174static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file, 3175 char __user *user_buf, size_t count, loff_t *ppos) 3176{ 3177 char *buff; 3178 int desc = 0; 3179 int i, j; 3180 ssize_t ret; 3181 3182 struct iwl_lq_sta *lq_sta = file->private_data; 3183 3184 buff = kmalloc(1024, GFP_KERNEL); 3185 if (!buff) 3186 return -ENOMEM; 3187 3188 for (i = 0; i < LQ_SIZE; i++) { 3189 desc += sprintf(buff+desc, 3190 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n" 3191 "rate=0x%X\n", 3192 lq_sta->active_tbl == i ? "*" : "x", 3193 lq_sta->lq_info[i].lq_type, 3194 lq_sta->lq_info[i].is_SGI, 3195 lq_sta->lq_info[i].is_ht40, 3196 lq_sta->lq_info[i].is_dup, 3197 lq_sta->is_green, 3198 lq_sta->lq_info[i].current_rate); 3199 for (j = 0; j < IWL_RATE_COUNT; j++) { 3200 desc += sprintf(buff+desc, 3201 "counter=%d success=%d %%=%d\n", 3202 lq_sta->lq_info[i].win[j].counter, 3203 lq_sta->lq_info[i].win[j].success_counter, 3204 lq_sta->lq_info[i].win[j].success_ratio); 3205 } 3206 } 3207 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3208 kfree(buff); 3209 return ret; 3210} 3211 3212static const struct file_operations rs_sta_dbgfs_stats_table_ops = { 3213 .read = rs_sta_dbgfs_stats_table_read, 3214 .open = simple_open, 3215 .llseek = default_llseek, 3216}; 3217 3218static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file, 3219 char __user *user_buf, size_t count, loff_t *ppos) 3220{ 3221 struct iwl_lq_sta *lq_sta = file->private_data; 3222 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl]; 3223 char buff[120]; 3224 int desc = 0; 3225 3226 if (is_Ht(tbl->lq_type)) 3227 desc += sprintf(buff+desc, 3228 "Bit Rate= %d Mb/s\n", 3229 tbl->expected_tpt[lq_sta->last_txrate_idx]); 3230 else 3231 desc += sprintf(buff+desc, 3232 "Bit Rate= %d Mb/s\n", 3233 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1); 3234 3235 return simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3236} 3237 3238static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = { 3239 .read = rs_sta_dbgfs_rate_scale_data_read, 3240 .open = simple_open, 3241 .llseek = default_llseek, 3242}; 3243 3244static void rs_add_debugfs(void *priv, void *priv_sta, 3245 struct dentry *dir) 3246{ 3247 struct iwl_lq_sta *lq_sta = priv_sta; 3248 3249 debugfs_create_file("rate_scale_table", 0600, dir, lq_sta, 3250 &rs_sta_dbgfs_scale_table_ops); 3251 debugfs_create_file("rate_stats_table", 0400, dir, lq_sta, 3252 &rs_sta_dbgfs_stats_table_ops); 3253 debugfs_create_file("rate_scale_data", 0400, dir, lq_sta, 3254 &rs_sta_dbgfs_rate_scale_data_ops); 3255 debugfs_create_u8("tx_agg_tid_enable", 0600, dir, 3256 &lq_sta->tx_agg_tid_en); 3257 3258} 3259#endif 3260 3261/* 3262 * Initialization of rate scaling information is done by driver after 3263 * the station is added. Since mac80211 calls this function before a 3264 * station is added we ignore it. 3265 */ 3266static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband, 3267 struct cfg80211_chan_def *chandef, 3268 struct ieee80211_sta *sta, void *priv_sta) 3269{ 3270} 3271 3272static const struct rate_control_ops rs_ops = { 3273 .name = RS_NAME, 3274 .tx_status = rs_tx_status, 3275 .get_rate = rs_get_rate, 3276 .rate_init = rs_rate_init_stub, 3277 .alloc = rs_alloc, 3278 .free = rs_free, 3279 .alloc_sta = rs_alloc_sta, 3280 .free_sta = rs_free_sta, 3281#ifdef CONFIG_MAC80211_DEBUGFS 3282 .add_sta_debugfs = rs_add_debugfs, 3283#endif 3284}; 3285 3286int iwlagn_rate_control_register(void) 3287{ 3288 return ieee80211_rate_control_register(&rs_ops); 3289} 3290 3291void iwlagn_rate_control_unregister(void) 3292{ 3293 ieee80211_rate_control_unregister(&rs_ops); 3294} 3295 3296