1/****************************************************************************** 2 * 3 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved. 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms of version 2 of the GNU General Public License as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 12 * more details. 13 * 14 * You should have received a copy of the GNU General Public License along with 15 * this program; if not, write to the Free Software Foundation, Inc., 16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA 17 * 18 * The full GNU General Public License is included in this distribution in the 19 * file called LICENSE. 20 * 21 * Contact Information: 22 * Intel Linux Wireless <ilw@linux.intel.com> 23 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 24 * 25 *****************************************************************************/ 26#include <linux/kernel.h> 27#include <linux/skbuff.h> 28#include <linux/slab.h> 29#include <net/mac80211.h> 30 31#include <linux/netdevice.h> 32#include <linux/etherdevice.h> 33#include <linux/delay.h> 34 35#include <linux/workqueue.h> 36 37#include "dev.h" 38#include "agn.h" 39 40#define RS_NAME "iwl-agn-rs" 41 42#define NUM_TRY_BEFORE_ANT_TOGGLE 1 43#define IWL_NUMBER_TRY 1 44#define IWL_HT_NUMBER_TRY 3 45 46#define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */ 47#define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */ 48#define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */ 49 50/* max allowed rate miss before sync LQ cmd */ 51#define IWL_MISSED_RATE_MAX 15 52/* max time to accum history 2 seconds */ 53#define IWL_RATE_SCALE_FLUSH_INTVL (3*HZ) 54 55static u8 rs_ht_to_legacy[] = { 56 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX, 57 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX, 58 IWL_RATE_6M_INDEX, 59 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX, 60 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX, 61 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX, 62 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX 63}; 64 65static const u8 ant_toggle_lookup[] = { 66 /*ANT_NONE -> */ ANT_NONE, 67 /*ANT_A -> */ ANT_B, 68 /*ANT_B -> */ ANT_C, 69 /*ANT_AB -> */ ANT_BC, 70 /*ANT_C -> */ ANT_A, 71 /*ANT_AC -> */ ANT_AB, 72 /*ANT_BC -> */ ANT_AC, 73 /*ANT_ABC -> */ ANT_ABC, 74}; 75 76#define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np) \ 77 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \ 78 IWL_RATE_SISO_##s##M_PLCP, \ 79 IWL_RATE_MIMO2_##s##M_PLCP,\ 80 IWL_RATE_MIMO3_##s##M_PLCP,\ 81 IWL_RATE_##r##M_IEEE, \ 82 IWL_RATE_##ip##M_INDEX, \ 83 IWL_RATE_##in##M_INDEX, \ 84 IWL_RATE_##rp##M_INDEX, \ 85 IWL_RATE_##rn##M_INDEX, \ 86 IWL_RATE_##pp##M_INDEX, \ 87 IWL_RATE_##np##M_INDEX } 88 89/* 90 * Parameter order: 91 * rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate 92 * 93 * If there isn't a valid next or previous rate then INV is used which 94 * maps to IWL_RATE_INVALID 95 * 96 */ 97const struct iwl_rate_info iwl_rates[IWL_RATE_COUNT] = { 98 IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2), /* 1mbps */ 99 IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5), /* 2mbps */ 100 IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11), /*5.5mbps */ 101 IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18), /* 11mbps */ 102 IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11), /* 6mbps */ 103 IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11), /* 9mbps */ 104 IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18), /* 12mbps */ 105 IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24), /* 18mbps */ 106 IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36), /* 24mbps */ 107 IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48), /* 36mbps */ 108 IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54), /* 48mbps */ 109 IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */ 110 IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */ 111 /* FIXME:RS: ^^ should be INV (legacy) */ 112}; 113 114static inline u8 rs_extract_rate(u32 rate_n_flags) 115{ 116 return (u8)(rate_n_flags & RATE_MCS_RATE_MSK); 117} 118 119static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags) 120{ 121 int idx = 0; 122 123 /* HT rate format */ 124 if (rate_n_flags & RATE_MCS_HT_MSK) { 125 idx = rs_extract_rate(rate_n_flags); 126 127 if (idx >= IWL_RATE_MIMO3_6M_PLCP) 128 idx = idx - IWL_RATE_MIMO3_6M_PLCP; 129 else if (idx >= IWL_RATE_MIMO2_6M_PLCP) 130 idx = idx - IWL_RATE_MIMO2_6M_PLCP; 131 132 idx += IWL_FIRST_OFDM_RATE; 133 /* skip 9M not supported in ht*/ 134 if (idx >= IWL_RATE_9M_INDEX) 135 idx += 1; 136 if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE)) 137 return idx; 138 139 /* legacy rate format, search for match in table */ 140 } else { 141 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++) 142 if (iwl_rates[idx].plcp == 143 rs_extract_rate(rate_n_flags)) 144 return idx; 145 } 146 147 return -1; 148} 149 150static void rs_rate_scale_perform(struct iwl_priv *priv, 151 struct sk_buff *skb, 152 struct ieee80211_sta *sta, 153 struct iwl_lq_sta *lq_sta); 154static void rs_fill_link_cmd(struct iwl_priv *priv, 155 struct iwl_lq_sta *lq_sta, u32 rate_n_flags); 156static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search); 157 158 159#ifdef CONFIG_MAC80211_DEBUGFS 160static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta, 161 u32 *rate_n_flags, int index); 162#else 163static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta, 164 u32 *rate_n_flags, int index) 165{} 166#endif 167 168/** 169 * The following tables contain the expected throughput metrics for all rates 170 * 171 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits 172 * 173 * where invalid entries are zeros. 174 * 175 * CCK rates are only valid in legacy table and will only be used in G 176 * (2.4 GHz) band. 177 */ 178 179static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = { 180 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0 181}; 182 183static const u16 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = { 184 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202}, /* Norm */ 185 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210}, /* SGI */ 186 {0, 0, 0, 0, 47, 0, 91, 133, 171, 242, 305, 334, 362}, /* AGG */ 187 {0, 0, 0, 0, 52, 0, 101, 145, 187, 264, 330, 361, 390}, /* AGG+SGI */ 188}; 189 190static const u16 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = { 191 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */ 192 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */ 193 {0, 0, 0, 0, 94, 0, 177, 249, 313, 423, 512, 550, 586}, /* AGG */ 194 {0, 0, 0, 0, 104, 0, 193, 270, 338, 454, 545, 584, 620}, /* AGG+SGI */ 195}; 196 197static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = { 198 {0, 0, 0, 0, 74, 0, 123, 155, 179, 214, 236, 244, 251}, /* Norm */ 199 {0, 0, 0, 0, 81, 0, 131, 164, 188, 223, 243, 251, 257}, /* SGI */ 200 {0, 0, 0, 0, 89, 0, 167, 235, 296, 402, 488, 526, 560}, /* AGG */ 201 {0, 0, 0, 0, 97, 0, 182, 255, 320, 431, 520, 558, 593}, /* AGG+SGI*/ 202}; 203 204static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = { 205 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */ 206 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */ 207 {0, 0, 0, 0, 171, 0, 305, 410, 496, 634, 731, 771, 805}, /* AGG */ 208 {0, 0, 0, 0, 186, 0, 329, 439, 527, 667, 764, 803, 838}, /* AGG+SGI */ 209}; 210 211static const u16 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = { 212 {0, 0, 0, 0, 99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */ 213 {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */ 214 {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */ 215 {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */ 216}; 217 218static const u16 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = { 219 {0, 0, 0, 0, 152, 0, 211, 239, 255, 279, 290, 294, 297}, /* Norm */ 220 {0, 0, 0, 0, 160, 0, 219, 245, 261, 284, 294, 297, 300}, /* SGI */ 221 {0, 0, 0, 0, 254, 0, 443, 584, 695, 868, 984, 1030, 1070}, /* AGG */ 222 {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */ 223}; 224 225/* mbps, mcs */ 226static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = { 227 { "1", "BPSK DSSS"}, 228 { "2", "QPSK DSSS"}, 229 {"5.5", "BPSK CCK"}, 230 { "11", "QPSK CCK"}, 231 { "6", "BPSK 1/2"}, 232 { "9", "BPSK 1/2"}, 233 { "12", "QPSK 1/2"}, 234 { "18", "QPSK 3/4"}, 235 { "24", "16QAM 1/2"}, 236 { "36", "16QAM 3/4"}, 237 { "48", "64QAM 2/3"}, 238 { "54", "64QAM 3/4"}, 239 { "60", "64QAM 5/6"}, 240}; 241 242#define MCS_INDEX_PER_STREAM (8) 243 244static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window) 245{ 246 window->data = 0; 247 window->success_counter = 0; 248 window->success_ratio = IWL_INVALID_VALUE; 249 window->counter = 0; 250 window->average_tpt = IWL_INVALID_VALUE; 251 window->stamp = 0; 252} 253 254static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type) 255{ 256 return (ant_type & valid_antenna) == ant_type; 257} 258 259/* 260 * removes the old data from the statistics. All data that is older than 261 * TID_MAX_TIME_DIFF, will be deleted. 262 */ 263static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time) 264{ 265 /* The oldest age we want to keep */ 266 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF; 267 268 while (tl->queue_count && 269 (tl->time_stamp < oldest_time)) { 270 tl->total -= tl->packet_count[tl->head]; 271 tl->packet_count[tl->head] = 0; 272 tl->time_stamp += TID_QUEUE_CELL_SPACING; 273 tl->queue_count--; 274 tl->head++; 275 if (tl->head >= TID_QUEUE_MAX_SIZE) 276 tl->head = 0; 277 } 278} 279 280/* 281 * increment traffic load value for tid and also remove 282 * any old values if passed the certain time period 283 */ 284static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data, 285 struct ieee80211_hdr *hdr) 286{ 287 u32 curr_time = jiffies_to_msecs(jiffies); 288 u32 time_diff; 289 s32 index; 290 struct iwl_traffic_load *tl = NULL; 291 u8 tid; 292 293 if (ieee80211_is_data_qos(hdr->frame_control)) { 294 u8 *qc = ieee80211_get_qos_ctl(hdr); 295 tid = qc[0] & 0xf; 296 } else 297 return IWL_MAX_TID_COUNT; 298 299 if (unlikely(tid >= IWL_MAX_TID_COUNT)) 300 return IWL_MAX_TID_COUNT; 301 302 tl = &lq_data->load[tid]; 303 304 curr_time -= curr_time % TID_ROUND_VALUE; 305 306 /* Happens only for the first packet. Initialize the data */ 307 if (!(tl->queue_count)) { 308 tl->total = 1; 309 tl->time_stamp = curr_time; 310 tl->queue_count = 1; 311 tl->head = 0; 312 tl->packet_count[0] = 1; 313 return IWL_MAX_TID_COUNT; 314 } 315 316 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time); 317 index = time_diff / TID_QUEUE_CELL_SPACING; 318 319 /* The history is too long: remove data that is older than */ 320 /* TID_MAX_TIME_DIFF */ 321 if (index >= TID_QUEUE_MAX_SIZE) 322 rs_tl_rm_old_stats(tl, curr_time); 323 324 index = (tl->head + index) % TID_QUEUE_MAX_SIZE; 325 tl->packet_count[index] = tl->packet_count[index] + 1; 326 tl->total = tl->total + 1; 327 328 if ((index + 1) > tl->queue_count) 329 tl->queue_count = index + 1; 330 331 return tid; 332} 333 334#ifdef CONFIG_MAC80211_DEBUGFS 335/** 336 * Program the device to use fixed rate for frame transmit 337 * This is for debugging/testing only 338 * once the device start use fixed rate, we need to reload the module 339 * to being back the normal operation. 340 */ 341static void rs_program_fix_rate(struct iwl_priv *priv, 342 struct iwl_lq_sta *lq_sta) 343{ 344 struct iwl_station_priv *sta_priv = 345 container_of(lq_sta, struct iwl_station_priv, lq_sta); 346 struct iwl_rxon_context *ctx = sta_priv->ctx; 347 348 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */ 349 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 350 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 351 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 352 353 IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n", 354 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate); 355 356 if (lq_sta->dbg_fixed_rate) { 357 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate); 358 iwl_send_lq_cmd(lq_sta->drv, ctx, &lq_sta->lq, CMD_ASYNC, 359 false); 360 } 361} 362#endif 363 364/* 365 get the traffic load value for tid 366*/ 367static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid) 368{ 369 u32 curr_time = jiffies_to_msecs(jiffies); 370 u32 time_diff; 371 s32 index; 372 struct iwl_traffic_load *tl = NULL; 373 374 if (tid >= IWL_MAX_TID_COUNT) 375 return 0; 376 377 tl = &(lq_data->load[tid]); 378 379 curr_time -= curr_time % TID_ROUND_VALUE; 380 381 if (!(tl->queue_count)) 382 return 0; 383 384 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time); 385 index = time_diff / TID_QUEUE_CELL_SPACING; 386 387 /* The history is too long: remove data that is older than */ 388 /* TID_MAX_TIME_DIFF */ 389 if (index >= TID_QUEUE_MAX_SIZE) 390 rs_tl_rm_old_stats(tl, curr_time); 391 392 return tl->total; 393} 394 395static int rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv, 396 struct iwl_lq_sta *lq_data, u8 tid, 397 struct ieee80211_sta *sta) 398{ 399 int ret = -EAGAIN; 400 u32 load; 401 402 /* 403 * Don't create TX aggregation sessions when in high 404 * BT traffic, as they would just be disrupted by BT. 405 */ 406 if (priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) { 407 IWL_DEBUG_COEX(priv, 408 "BT traffic (%d), no aggregation allowed\n", 409 priv->bt_traffic_load); 410 return ret; 411 } 412 413 load = rs_tl_get_load(lq_data, tid); 414 415 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n", 416 sta->addr, tid); 417 ret = ieee80211_start_tx_ba_session(sta, tid, 5000); 418 if (ret == -EAGAIN) { 419 /* 420 * driver and mac80211 is out of sync 421 * this might be cause by reloading firmware 422 * stop the tx ba session here 423 */ 424 IWL_ERR(priv, "Fail start Tx agg on tid: %d\n", 425 tid); 426 ieee80211_stop_tx_ba_session(sta, tid); 427 } 428 return ret; 429} 430 431static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid, 432 struct iwl_lq_sta *lq_data, 433 struct ieee80211_sta *sta) 434{ 435 if (tid < IWL_MAX_TID_COUNT) 436 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta); 437 else 438 IWL_ERR(priv, "tid exceeds max TID count: %d/%d\n", 439 tid, IWL_MAX_TID_COUNT); 440} 441 442static inline int get_num_of_ant_from_rate(u32 rate_n_flags) 443{ 444 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) + 445 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) + 446 !!(rate_n_flags & RATE_MCS_ANT_C_MSK); 447} 448 449/* 450 * Static function to get the expected throughput from an iwl_scale_tbl_info 451 * that wraps a NULL pointer check 452 */ 453static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index) 454{ 455 if (tbl->expected_tpt) 456 return tbl->expected_tpt[rs_index]; 457 return 0; 458} 459 460/** 461 * rs_collect_tx_data - Update the success/failure sliding window 462 * 463 * We keep a sliding window of the last 62 packets transmitted 464 * at this rate. window->data contains the bitmask of successful 465 * packets. 466 */ 467static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl, 468 int scale_index, int attempts, int successes) 469{ 470 struct iwl_rate_scale_data *window = NULL; 471 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1)); 472 s32 fail_count, tpt; 473 474 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT) 475 return -EINVAL; 476 477 /* Select window for current tx bit rate */ 478 window = &(tbl->win[scale_index]); 479 480 /* Get expected throughput */ 481 tpt = get_expected_tpt(tbl, scale_index); 482 483 /* 484 * Keep track of only the latest 62 tx frame attempts in this rate's 485 * history window; anything older isn't really relevant any more. 486 * If we have filled up the sliding window, drop the oldest attempt; 487 * if the oldest attempt (highest bit in bitmap) shows "success", 488 * subtract "1" from the success counter (this is the main reason 489 * we keep these bitmaps!). 490 */ 491 while (attempts > 0) { 492 if (window->counter >= IWL_RATE_MAX_WINDOW) { 493 494 /* remove earliest */ 495 window->counter = IWL_RATE_MAX_WINDOW - 1; 496 497 if (window->data & mask) { 498 window->data &= ~mask; 499 window->success_counter--; 500 } 501 } 502 503 /* Increment frames-attempted counter */ 504 window->counter++; 505 506 /* Shift bitmap by one frame to throw away oldest history */ 507 window->data <<= 1; 508 509 /* Mark the most recent #successes attempts as successful */ 510 if (successes > 0) { 511 window->success_counter++; 512 window->data |= 0x1; 513 successes--; 514 } 515 516 attempts--; 517 } 518 519 /* Calculate current success ratio, avoid divide-by-0! */ 520 if (window->counter > 0) 521 window->success_ratio = 128 * (100 * window->success_counter) 522 / window->counter; 523 else 524 window->success_ratio = IWL_INVALID_VALUE; 525 526 fail_count = window->counter - window->success_counter; 527 528 /* Calculate average throughput, if we have enough history. */ 529 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) || 530 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH)) 531 window->average_tpt = (window->success_ratio * tpt + 64) / 128; 532 else 533 window->average_tpt = IWL_INVALID_VALUE; 534 535 /* Tag this window as having been updated */ 536 window->stamp = jiffies; 537 538 return 0; 539} 540 541/* 542 * Fill uCode API rate_n_flags field, based on "search" or "active" table. 543 */ 544/* FIXME:RS:remove this function and put the flags statically in the table */ 545static u32 rate_n_flags_from_tbl(struct iwl_priv *priv, 546 struct iwl_scale_tbl_info *tbl, 547 int index, u8 use_green) 548{ 549 u32 rate_n_flags = 0; 550 551 if (is_legacy(tbl->lq_type)) { 552 rate_n_flags = iwl_rates[index].plcp; 553 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE) 554 rate_n_flags |= RATE_MCS_CCK_MSK; 555 556 } else if (is_Ht(tbl->lq_type)) { 557 if (index > IWL_LAST_OFDM_RATE) { 558 IWL_ERR(priv, "Invalid HT rate index %d\n", index); 559 index = IWL_LAST_OFDM_RATE; 560 } 561 rate_n_flags = RATE_MCS_HT_MSK; 562 563 if (is_siso(tbl->lq_type)) 564 rate_n_flags |= iwl_rates[index].plcp_siso; 565 else if (is_mimo2(tbl->lq_type)) 566 rate_n_flags |= iwl_rates[index].plcp_mimo2; 567 else 568 rate_n_flags |= iwl_rates[index].plcp_mimo3; 569 } else { 570 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type); 571 } 572 573 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) & 574 RATE_MCS_ANT_ABC_MSK); 575 576 if (is_Ht(tbl->lq_type)) { 577 if (tbl->is_ht40) { 578 if (tbl->is_dup) 579 rate_n_flags |= RATE_MCS_DUP_MSK; 580 else 581 rate_n_flags |= RATE_MCS_HT40_MSK; 582 } 583 if (tbl->is_SGI) 584 rate_n_flags |= RATE_MCS_SGI_MSK; 585 586 if (use_green) { 587 rate_n_flags |= RATE_MCS_GF_MSK; 588 if (is_siso(tbl->lq_type) && tbl->is_SGI) { 589 rate_n_flags &= ~RATE_MCS_SGI_MSK; 590 IWL_ERR(priv, "GF was set with SGI:SISO\n"); 591 } 592 } 593 } 594 return rate_n_flags; 595} 596 597/* 598 * Interpret uCode API's rate_n_flags format, 599 * fill "search" or "active" tx mode table. 600 */ 601static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags, 602 enum ieee80211_band band, 603 struct iwl_scale_tbl_info *tbl, 604 int *rate_idx) 605{ 606 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK); 607 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags); 608 u8 mcs; 609 610 memset(tbl, 0, sizeof(struct iwl_scale_tbl_info)); 611 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags); 612 613 if (*rate_idx == IWL_RATE_INVALID) { 614 *rate_idx = -1; 615 return -EINVAL; 616 } 617 tbl->is_SGI = 0; /* default legacy setup */ 618 tbl->is_ht40 = 0; 619 tbl->is_dup = 0; 620 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS); 621 tbl->lq_type = LQ_NONE; 622 tbl->max_search = IWL_MAX_SEARCH; 623 624 /* legacy rate format */ 625 if (!(rate_n_flags & RATE_MCS_HT_MSK)) { 626 if (num_of_ant == 1) { 627 if (band == IEEE80211_BAND_5GHZ) 628 tbl->lq_type = LQ_A; 629 else 630 tbl->lq_type = LQ_G; 631 } 632 /* HT rate format */ 633 } else { 634 if (rate_n_flags & RATE_MCS_SGI_MSK) 635 tbl->is_SGI = 1; 636 637 if ((rate_n_flags & RATE_MCS_HT40_MSK) || 638 (rate_n_flags & RATE_MCS_DUP_MSK)) 639 tbl->is_ht40 = 1; 640 641 if (rate_n_flags & RATE_MCS_DUP_MSK) 642 tbl->is_dup = 1; 643 644 mcs = rs_extract_rate(rate_n_flags); 645 646 /* SISO */ 647 if (mcs <= IWL_RATE_SISO_60M_PLCP) { 648 if (num_of_ant == 1) 649 tbl->lq_type = LQ_SISO; /*else NONE*/ 650 /* MIMO2 */ 651 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) { 652 if (num_of_ant == 2) 653 tbl->lq_type = LQ_MIMO2; 654 /* MIMO3 */ 655 } else { 656 if (num_of_ant == 3) { 657 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH; 658 tbl->lq_type = LQ_MIMO3; 659 } 660 } 661 } 662 return 0; 663} 664 665/* switch to another antenna/antennas and return 1 */ 666/* if no other valid antenna found, return 0 */ 667static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags, 668 struct iwl_scale_tbl_info *tbl) 669{ 670 u8 new_ant_type; 671 672 if (!tbl->ant_type || tbl->ant_type > ANT_ABC) 673 return 0; 674 675 if (!rs_is_valid_ant(valid_ant, tbl->ant_type)) 676 return 0; 677 678 new_ant_type = ant_toggle_lookup[tbl->ant_type]; 679 680 while ((new_ant_type != tbl->ant_type) && 681 !rs_is_valid_ant(valid_ant, new_ant_type)) 682 new_ant_type = ant_toggle_lookup[new_ant_type]; 683 684 if (new_ant_type == tbl->ant_type) 685 return 0; 686 687 tbl->ant_type = new_ant_type; 688 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK; 689 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS; 690 return 1; 691} 692 693/** 694 * Green-field mode is valid if the station supports it and 695 * there are no non-GF stations present in the BSS. 696 */ 697static bool rs_use_green(struct ieee80211_sta *sta) 698{ 699 /* 700 * There's a bug somewhere in this code that causes the 701 * scaling to get stuck because GF+SGI can't be combined 702 * in SISO rates. Until we find that bug, disable GF, it 703 * has only limited benefit and we still interoperate with 704 * GF APs since we can always receive GF transmissions. 705 */ 706 return false; 707} 708 709/** 710 * rs_get_supported_rates - get the available rates 711 * 712 * if management frame or broadcast frame only return 713 * basic available rates. 714 * 715 */ 716static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta, 717 struct ieee80211_hdr *hdr, 718 enum iwl_table_type rate_type) 719{ 720 if (is_legacy(rate_type)) { 721 return lq_sta->active_legacy_rate; 722 } else { 723 if (is_siso(rate_type)) 724 return lq_sta->active_siso_rate; 725 else if (is_mimo2(rate_type)) 726 return lq_sta->active_mimo2_rate; 727 else 728 return lq_sta->active_mimo3_rate; 729 } 730} 731 732static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask, 733 int rate_type) 734{ 735 u8 high = IWL_RATE_INVALID; 736 u8 low = IWL_RATE_INVALID; 737 738 /* 802.11A or ht walks to the next literal adjacent rate in 739 * the rate table */ 740 if (is_a_band(rate_type) || !is_legacy(rate_type)) { 741 int i; 742 u32 mask; 743 744 /* Find the previous rate that is in the rate mask */ 745 i = index - 1; 746 for (mask = (1 << i); i >= 0; i--, mask >>= 1) { 747 if (rate_mask & mask) { 748 low = i; 749 break; 750 } 751 } 752 753 /* Find the next rate that is in the rate mask */ 754 i = index + 1; 755 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) { 756 if (rate_mask & mask) { 757 high = i; 758 break; 759 } 760 } 761 762 return (high << 8) | low; 763 } 764 765 low = index; 766 while (low != IWL_RATE_INVALID) { 767 low = iwl_rates[low].prev_rs; 768 if (low == IWL_RATE_INVALID) 769 break; 770 if (rate_mask & (1 << low)) 771 break; 772 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low); 773 } 774 775 high = index; 776 while (high != IWL_RATE_INVALID) { 777 high = iwl_rates[high].next_rs; 778 if (high == IWL_RATE_INVALID) 779 break; 780 if (rate_mask & (1 << high)) 781 break; 782 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high); 783 } 784 785 return (high << 8) | low; 786} 787 788static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta, 789 struct iwl_scale_tbl_info *tbl, 790 u8 scale_index, u8 ht_possible) 791{ 792 s32 low; 793 u16 rate_mask; 794 u16 high_low; 795 u8 switch_to_legacy = 0; 796 u8 is_green = lq_sta->is_green; 797 struct iwl_priv *priv = lq_sta->drv; 798 799 /* check if we need to switch from HT to legacy rates. 800 * assumption is that mandatory rates (1Mbps or 6Mbps) 801 * are always supported (spec demand) */ 802 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) { 803 switch_to_legacy = 1; 804 scale_index = rs_ht_to_legacy[scale_index]; 805 if (lq_sta->band == IEEE80211_BAND_5GHZ) 806 tbl->lq_type = LQ_A; 807 else 808 tbl->lq_type = LQ_G; 809 810 if (num_of_ant(tbl->ant_type) > 1) 811 tbl->ant_type = 812 first_antenna(priv->nvm_data->valid_tx_ant); 813 814 tbl->is_ht40 = 0; 815 tbl->is_SGI = 0; 816 tbl->max_search = IWL_MAX_SEARCH; 817 } 818 819 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type); 820 821 /* Mask with station rate restriction */ 822 if (is_legacy(tbl->lq_type)) { 823 /* supp_rates has no CCK bits in A mode */ 824 if (lq_sta->band == IEEE80211_BAND_5GHZ) 825 rate_mask = (u16)(rate_mask & 826 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE)); 827 else 828 rate_mask = (u16)(rate_mask & lq_sta->supp_rates); 829 } 830 831 /* If we switched from HT to legacy, check current rate */ 832 if (switch_to_legacy && (rate_mask & (1 << scale_index))) { 833 low = scale_index; 834 goto out; 835 } 836 837 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask, 838 tbl->lq_type); 839 low = high_low & 0xff; 840 841 if (low == IWL_RATE_INVALID) 842 low = scale_index; 843 844out: 845 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green); 846} 847 848/* 849 * Simple function to compare two rate scale table types 850 */ 851static bool table_type_matches(struct iwl_scale_tbl_info *a, 852 struct iwl_scale_tbl_info *b) 853{ 854 return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) && 855 (a->is_SGI == b->is_SGI); 856} 857 858static void rs_bt_update_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx, 859 struct iwl_lq_sta *lq_sta) 860{ 861 struct iwl_scale_tbl_info *tbl; 862 bool full_concurrent = priv->bt_full_concurrent; 863 864 if (priv->bt_ant_couple_ok) { 865 /* 866 * Is there a need to switch between 867 * full concurrency and 3-wire? 868 */ 869 if (priv->bt_ci_compliance && priv->bt_ant_couple_ok) 870 full_concurrent = true; 871 else 872 full_concurrent = false; 873 } 874 if ((priv->bt_traffic_load != priv->last_bt_traffic_load) || 875 (priv->bt_full_concurrent != full_concurrent)) { 876 priv->bt_full_concurrent = full_concurrent; 877 priv->last_bt_traffic_load = priv->bt_traffic_load; 878 879 /* Update uCode's rate table. */ 880 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 881 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate); 882 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false); 883 884 queue_work(priv->workqueue, &priv->bt_full_concurrency); 885 } 886} 887 888/* 889 * mac80211 sends us Tx status 890 */ 891static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband, 892 struct ieee80211_sta *sta, void *priv_sta, 893 struct sk_buff *skb) 894{ 895 int legacy_success; 896 int retries; 897 int rs_index, mac_index, i; 898 struct iwl_lq_sta *lq_sta = priv_sta; 899 struct iwl_link_quality_cmd *table; 900 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 901 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)priv_r; 902 struct iwl_priv *priv = IWL_OP_MODE_GET_DVM(op_mode); 903 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 904 enum mac80211_rate_control_flags mac_flags; 905 u32 tx_rate; 906 struct iwl_scale_tbl_info tbl_type; 907 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl; 908 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv; 909 struct iwl_rxon_context *ctx = sta_priv->ctx; 910 911 IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n"); 912 913 /* Treat uninitialized rate scaling data same as non-existing. */ 914 if (!lq_sta) { 915 IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n"); 916 return; 917 } else if (!lq_sta->drv) { 918 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n"); 919 return; 920 } 921 922 if (!ieee80211_is_data(hdr->frame_control) || 923 info->flags & IEEE80211_TX_CTL_NO_ACK) 924 return; 925 926 /* This packet was aggregated but doesn't carry status info */ 927 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 928 !(info->flags & IEEE80211_TX_STAT_AMPDU)) 929 return; 930 931 /* 932 * Ignore this Tx frame response if its initial rate doesn't match 933 * that of latest Link Quality command. There may be stragglers 934 * from a previous Link Quality command, but we're no longer interested 935 * in those; they're either from the "active" mode while we're trying 936 * to check "search" mode, or a prior "search" mode after we've moved 937 * to a new "search" mode (which might become the new "active" mode). 938 */ 939 table = &lq_sta->lq; 940 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags); 941 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index); 942 if (priv->band == IEEE80211_BAND_5GHZ) 943 rs_index -= IWL_FIRST_OFDM_RATE; 944 mac_flags = info->status.rates[0].flags; 945 mac_index = info->status.rates[0].idx; 946 /* For HT packets, map MCS to PLCP */ 947 if (mac_flags & IEEE80211_TX_RC_MCS) { 948 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */ 949 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE)) 950 mac_index++; 951 /* 952 * mac80211 HT index is always zero-indexed; we need to move 953 * HT OFDM rates after CCK rates in 2.4 GHz band 954 */ 955 if (priv->band == IEEE80211_BAND_2GHZ) 956 mac_index += IWL_FIRST_OFDM_RATE; 957 } 958 /* Here we actually compare this rate to the latest LQ command */ 959 if ((mac_index < 0) || 960 (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) || 961 (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) || 962 (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) || 963 (tbl_type.ant_type != info->status.antenna) || 964 (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) || 965 (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) || 966 (rs_index != mac_index)) { 967 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate); 968 /* 969 * Since rates mis-match, the last LQ command may have failed. 970 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with 971 * ... driver. 972 */ 973 lq_sta->missed_rate_counter++; 974 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) { 975 lq_sta->missed_rate_counter = 0; 976 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false); 977 } 978 /* Regardless, ignore this status info for outdated rate */ 979 return; 980 } else 981 /* Rate did match, so reset the missed_rate_counter */ 982 lq_sta->missed_rate_counter = 0; 983 984 /* Figure out if rate scale algorithm is in active or search table */ 985 if (table_type_matches(&tbl_type, 986 &(lq_sta->lq_info[lq_sta->active_tbl]))) { 987 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 988 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 989 } else if (table_type_matches(&tbl_type, 990 &lq_sta->lq_info[1 - lq_sta->active_tbl])) { 991 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 992 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 993 } else { 994 IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n"); 995 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 996 IWL_DEBUG_RATE(priv, "active- lq:%x, ant:%x, SGI:%d\n", 997 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI); 998 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 999 IWL_DEBUG_RATE(priv, "search- lq:%x, ant:%x, SGI:%d\n", 1000 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI); 1001 IWL_DEBUG_RATE(priv, "actual- lq:%x, ant:%x, SGI:%d\n", 1002 tbl_type.lq_type, tbl_type.ant_type, tbl_type.is_SGI); 1003 /* 1004 * no matching table found, let's by-pass the data collection 1005 * and continue to perform rate scale to find the rate table 1006 */ 1007 rs_stay_in_table(lq_sta, true); 1008 goto done; 1009 } 1010 1011 /* 1012 * Updating the frame history depends on whether packets were 1013 * aggregated. 1014 * 1015 * For aggregation, all packets were transmitted at the same rate, the 1016 * first index into rate scale table. 1017 */ 1018 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 1019 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags); 1020 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, 1021 &rs_index); 1022 rs_collect_tx_data(curr_tbl, rs_index, 1023 info->status.ampdu_len, 1024 info->status.ampdu_ack_len); 1025 1026 /* Update success/fail counts if not searching for new mode */ 1027 if (lq_sta->stay_in_tbl) { 1028 lq_sta->total_success += info->status.ampdu_ack_len; 1029 lq_sta->total_failed += (info->status.ampdu_len - 1030 info->status.ampdu_ack_len); 1031 } 1032 } else { 1033 /* 1034 * For legacy, update frame history with for each Tx retry. 1035 */ 1036 retries = info->status.rates[0].count - 1; 1037 /* HW doesn't send more than 15 retries */ 1038 retries = min(retries, 15); 1039 1040 /* The last transmission may have been successful */ 1041 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK); 1042 /* Collect data for each rate used during failed TX attempts */ 1043 for (i = 0; i <= retries; ++i) { 1044 tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags); 1045 rs_get_tbl_info_from_mcs(tx_rate, priv->band, 1046 &tbl_type, &rs_index); 1047 /* 1048 * Only collect stats if retried rate is in the same RS 1049 * table as active/search. 1050 */ 1051 if (table_type_matches(&tbl_type, curr_tbl)) 1052 tmp_tbl = curr_tbl; 1053 else if (table_type_matches(&tbl_type, other_tbl)) 1054 tmp_tbl = other_tbl; 1055 else 1056 continue; 1057 rs_collect_tx_data(tmp_tbl, rs_index, 1, 1058 i < retries ? 0 : legacy_success); 1059 } 1060 1061 /* Update success/fail counts if not searching for new mode */ 1062 if (lq_sta->stay_in_tbl) { 1063 lq_sta->total_success += legacy_success; 1064 lq_sta->total_failed += retries + (1 - legacy_success); 1065 } 1066 } 1067 /* The last TX rate is cached in lq_sta; it's set in if/else above */ 1068 lq_sta->last_rate_n_flags = tx_rate; 1069done: 1070 /* See if there's a better rate or modulation mode to try. */ 1071 if (sta && sta->supp_rates[sband->band]) 1072 rs_rate_scale_perform(priv, skb, sta, lq_sta); 1073 1074 if (priv->lib->bt_params && priv->lib->bt_params->advanced_bt_coexist) 1075 rs_bt_update_lq(priv, ctx, lq_sta); 1076} 1077 1078/* 1079 * Begin a period of staying with a selected modulation mode. 1080 * Set "stay_in_tbl" flag to prevent any mode switches. 1081 * Set frame tx success limits according to legacy vs. high-throughput, 1082 * and reset overall (spanning all rates) tx success history statistics. 1083 * These control how long we stay using same modulation mode before 1084 * searching for a new mode. 1085 */ 1086static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy, 1087 struct iwl_lq_sta *lq_sta) 1088{ 1089 IWL_DEBUG_RATE(priv, "we are staying in the same table\n"); 1090 lq_sta->stay_in_tbl = 1; /* only place this gets set */ 1091 if (is_legacy) { 1092 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT; 1093 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT; 1094 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT; 1095 } else { 1096 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT; 1097 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT; 1098 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT; 1099 } 1100 lq_sta->table_count = 0; 1101 lq_sta->total_failed = 0; 1102 lq_sta->total_success = 0; 1103 lq_sta->flush_timer = jiffies; 1104 lq_sta->action_counter = 0; 1105} 1106 1107/* 1108 * Find correct throughput table for given mode of modulation 1109 */ 1110static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1111 struct iwl_scale_tbl_info *tbl) 1112{ 1113 /* Used to choose among HT tables */ 1114 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT]; 1115 1116 /* Check for invalid LQ type */ 1117 if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) { 1118 tbl->expected_tpt = expected_tpt_legacy; 1119 return; 1120 } 1121 1122 /* Legacy rates have only one table */ 1123 if (is_legacy(tbl->lq_type)) { 1124 tbl->expected_tpt = expected_tpt_legacy; 1125 return; 1126 } 1127 1128 /* Choose among many HT tables depending on number of streams 1129 * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation 1130 * status */ 1131 if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup)) 1132 ht_tbl_pointer = expected_tpt_siso20MHz; 1133 else if (is_siso(tbl->lq_type)) 1134 ht_tbl_pointer = expected_tpt_siso40MHz; 1135 else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup)) 1136 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1137 else if (is_mimo2(tbl->lq_type)) 1138 ht_tbl_pointer = expected_tpt_mimo2_40MHz; 1139 else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup)) 1140 ht_tbl_pointer = expected_tpt_mimo3_20MHz; 1141 else /* if (is_mimo3(tbl->lq_type)) <-- must be true */ 1142 ht_tbl_pointer = expected_tpt_mimo3_40MHz; 1143 1144 if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */ 1145 tbl->expected_tpt = ht_tbl_pointer[0]; 1146 else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */ 1147 tbl->expected_tpt = ht_tbl_pointer[1]; 1148 else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */ 1149 tbl->expected_tpt = ht_tbl_pointer[2]; 1150 else /* AGG+SGI */ 1151 tbl->expected_tpt = ht_tbl_pointer[3]; 1152} 1153 1154/* 1155 * Find starting rate for new "search" high-throughput mode of modulation. 1156 * Goal is to find lowest expected rate (under perfect conditions) that is 1157 * above the current measured throughput of "active" mode, to give new mode 1158 * a fair chance to prove itself without too many challenges. 1159 * 1160 * This gets called when transitioning to more aggressive modulation 1161 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive 1162 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need 1163 * to decrease to match "active" throughput. When moving from MIMO to SISO, 1164 * bit rate will typically need to increase, but not if performance was bad. 1165 */ 1166static s32 rs_get_best_rate(struct iwl_priv *priv, 1167 struct iwl_lq_sta *lq_sta, 1168 struct iwl_scale_tbl_info *tbl, /* "search" */ 1169 u16 rate_mask, s8 index) 1170{ 1171 /* "active" values */ 1172 struct iwl_scale_tbl_info *active_tbl = 1173 &(lq_sta->lq_info[lq_sta->active_tbl]); 1174 s32 active_sr = active_tbl->win[index].success_ratio; 1175 s32 active_tpt = active_tbl->expected_tpt[index]; 1176 /* expected "search" throughput */ 1177 const u16 *tpt_tbl = tbl->expected_tpt; 1178 1179 s32 new_rate, high, low, start_hi; 1180 u16 high_low; 1181 s8 rate = index; 1182 1183 new_rate = high = low = start_hi = IWL_RATE_INVALID; 1184 1185 for (; ;) { 1186 high_low = rs_get_adjacent_rate(priv, rate, rate_mask, 1187 tbl->lq_type); 1188 1189 low = high_low & 0xff; 1190 high = (high_low >> 8) & 0xff; 1191 1192 /* 1193 * Lower the "search" bit rate, to give new "search" mode 1194 * approximately the same throughput as "active" if: 1195 * 1196 * 1) "Active" mode has been working modestly well (but not 1197 * great), and expected "search" throughput (under perfect 1198 * conditions) at candidate rate is above the actual 1199 * measured "active" throughput (but less than expected 1200 * "active" throughput under perfect conditions). 1201 * OR 1202 * 2) "Active" mode has been working perfectly or very well 1203 * and expected "search" throughput (under perfect 1204 * conditions) at candidate rate is above expected 1205 * "active" throughput (under perfect conditions). 1206 */ 1207 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) && 1208 ((active_sr > IWL_RATE_DECREASE_TH) && 1209 (active_sr <= IWL_RATE_HIGH_TH) && 1210 (tpt_tbl[rate] <= active_tpt))) || 1211 ((active_sr >= IWL_RATE_SCALE_SWITCH) && 1212 (tpt_tbl[rate] > active_tpt))) { 1213 1214 /* (2nd or later pass) 1215 * If we've already tried to raise the rate, and are 1216 * now trying to lower it, use the higher rate. */ 1217 if (start_hi != IWL_RATE_INVALID) { 1218 new_rate = start_hi; 1219 break; 1220 } 1221 1222 new_rate = rate; 1223 1224 /* Loop again with lower rate */ 1225 if (low != IWL_RATE_INVALID) 1226 rate = low; 1227 1228 /* Lower rate not available, use the original */ 1229 else 1230 break; 1231 1232 /* Else try to raise the "search" rate to match "active" */ 1233 } else { 1234 /* (2nd or later pass) 1235 * If we've already tried to lower the rate, and are 1236 * now trying to raise it, use the lower rate. */ 1237 if (new_rate != IWL_RATE_INVALID) 1238 break; 1239 1240 /* Loop again with higher rate */ 1241 else if (high != IWL_RATE_INVALID) { 1242 start_hi = high; 1243 rate = high; 1244 1245 /* Higher rate not available, use the original */ 1246 } else { 1247 new_rate = rate; 1248 break; 1249 } 1250 } 1251 } 1252 1253 return new_rate; 1254} 1255 1256/* 1257 * Set up search table for MIMO2 1258 */ 1259static int rs_switch_to_mimo2(struct iwl_priv *priv, 1260 struct iwl_lq_sta *lq_sta, 1261 struct ieee80211_conf *conf, 1262 struct ieee80211_sta *sta, 1263 struct iwl_scale_tbl_info *tbl, int index) 1264{ 1265 u16 rate_mask; 1266 s32 rate; 1267 s8 is_green = lq_sta->is_green; 1268 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv; 1269 struct iwl_rxon_context *ctx = sta_priv->ctx; 1270 1271 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported) 1272 return -1; 1273 1274 if (sta->smps_mode == IEEE80211_SMPS_STATIC) 1275 return -1; 1276 1277 /* Need both Tx chains/antennas to support MIMO */ 1278 if (priv->hw_params.tx_chains_num < 2) 1279 return -1; 1280 1281 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n"); 1282 1283 tbl->lq_type = LQ_MIMO2; 1284 tbl->is_dup = lq_sta->is_dup; 1285 tbl->action = 0; 1286 tbl->max_search = IWL_MAX_SEARCH; 1287 rate_mask = lq_sta->active_mimo2_rate; 1288 1289 if (iwl_is_ht40_tx_allowed(priv, ctx, sta)) 1290 tbl->is_ht40 = 1; 1291 else 1292 tbl->is_ht40 = 0; 1293 1294 rs_set_expected_tpt_table(lq_sta, tbl); 1295 1296 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index); 1297 1298 IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask); 1299 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) { 1300 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n", 1301 rate, rate_mask); 1302 return -1; 1303 } 1304 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green); 1305 1306 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n", 1307 tbl->current_rate, is_green); 1308 return 0; 1309} 1310 1311/* 1312 * Set up search table for MIMO3 1313 */ 1314static int rs_switch_to_mimo3(struct iwl_priv *priv, 1315 struct iwl_lq_sta *lq_sta, 1316 struct ieee80211_conf *conf, 1317 struct ieee80211_sta *sta, 1318 struct iwl_scale_tbl_info *tbl, int index) 1319{ 1320 u16 rate_mask; 1321 s32 rate; 1322 s8 is_green = lq_sta->is_green; 1323 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv; 1324 struct iwl_rxon_context *ctx = sta_priv->ctx; 1325 1326 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported) 1327 return -1; 1328 1329 if (sta->smps_mode == IEEE80211_SMPS_STATIC) 1330 return -1; 1331 1332 /* Need both Tx chains/antennas to support MIMO */ 1333 if (priv->hw_params.tx_chains_num < 3) 1334 return -1; 1335 1336 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n"); 1337 1338 tbl->lq_type = LQ_MIMO3; 1339 tbl->is_dup = lq_sta->is_dup; 1340 tbl->action = 0; 1341 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH; 1342 rate_mask = lq_sta->active_mimo3_rate; 1343 1344 if (iwl_is_ht40_tx_allowed(priv, ctx, sta)) 1345 tbl->is_ht40 = 1; 1346 else 1347 tbl->is_ht40 = 0; 1348 1349 rs_set_expected_tpt_table(lq_sta, tbl); 1350 1351 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index); 1352 1353 IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n", 1354 rate, rate_mask); 1355 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) { 1356 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n", 1357 rate, rate_mask); 1358 return -1; 1359 } 1360 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green); 1361 1362 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n", 1363 tbl->current_rate, is_green); 1364 return 0; 1365} 1366 1367/* 1368 * Set up search table for SISO 1369 */ 1370static int rs_switch_to_siso(struct iwl_priv *priv, 1371 struct iwl_lq_sta *lq_sta, 1372 struct ieee80211_conf *conf, 1373 struct ieee80211_sta *sta, 1374 struct iwl_scale_tbl_info *tbl, int index) 1375{ 1376 u16 rate_mask; 1377 u8 is_green = lq_sta->is_green; 1378 s32 rate; 1379 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv; 1380 struct iwl_rxon_context *ctx = sta_priv->ctx; 1381 1382 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported) 1383 return -1; 1384 1385 IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n"); 1386 1387 tbl->is_dup = lq_sta->is_dup; 1388 tbl->lq_type = LQ_SISO; 1389 tbl->action = 0; 1390 tbl->max_search = IWL_MAX_SEARCH; 1391 rate_mask = lq_sta->active_siso_rate; 1392 1393 if (iwl_is_ht40_tx_allowed(priv, ctx, sta)) 1394 tbl->is_ht40 = 1; 1395 else 1396 tbl->is_ht40 = 0; 1397 1398 if (is_green) 1399 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/ 1400 1401 rs_set_expected_tpt_table(lq_sta, tbl); 1402 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index); 1403 1404 IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask); 1405 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) { 1406 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n", 1407 rate, rate_mask); 1408 return -1; 1409 } 1410 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green); 1411 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n", 1412 tbl->current_rate, is_green); 1413 return 0; 1414} 1415 1416/* 1417 * Try to switch to new modulation mode from legacy 1418 */ 1419static int rs_move_legacy_other(struct iwl_priv *priv, 1420 struct iwl_lq_sta *lq_sta, 1421 struct ieee80211_conf *conf, 1422 struct ieee80211_sta *sta, 1423 int index) 1424{ 1425 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1426 struct iwl_scale_tbl_info *search_tbl = 1427 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 1428 struct iwl_rate_scale_data *window = &(tbl->win[index]); 1429 u32 sz = (sizeof(struct iwl_scale_tbl_info) - 1430 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); 1431 u8 start_action; 1432 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant; 1433 u8 tx_chains_num = priv->hw_params.tx_chains_num; 1434 int ret = 0; 1435 u8 update_search_tbl_counter = 0; 1436 1437 switch (priv->bt_traffic_load) { 1438 case IWL_BT_COEX_TRAFFIC_LOAD_NONE: 1439 /* nothing */ 1440 break; 1441 case IWL_BT_COEX_TRAFFIC_LOAD_LOW: 1442 /* avoid antenna B unless MIMO */ 1443 if (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2) 1444 tbl->action = IWL_LEGACY_SWITCH_SISO; 1445 break; 1446 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH: 1447 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS: 1448 /* avoid antenna B and MIMO */ 1449 valid_tx_ant = 1450 first_antenna(priv->nvm_data->valid_tx_ant); 1451 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2 && 1452 tbl->action != IWL_LEGACY_SWITCH_SISO) 1453 tbl->action = IWL_LEGACY_SWITCH_SISO; 1454 break; 1455 default: 1456 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load); 1457 break; 1458 } 1459 1460 if (!iwl_ht_enabled(priv)) 1461 /* stay in Legacy */ 1462 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1; 1463 else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE && 1464 tbl->action > IWL_LEGACY_SWITCH_SISO) 1465 tbl->action = IWL_LEGACY_SWITCH_SISO; 1466 1467 /* configure as 1x1 if bt full concurrency */ 1468 if (priv->bt_full_concurrent) { 1469 if (!iwl_ht_enabled(priv)) 1470 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1; 1471 else if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2) 1472 tbl->action = IWL_LEGACY_SWITCH_SISO; 1473 valid_tx_ant = 1474 first_antenna(priv->nvm_data->valid_tx_ant); 1475 } 1476 1477 start_action = tbl->action; 1478 for (; ;) { 1479 lq_sta->action_counter++; 1480 switch (tbl->action) { 1481 case IWL_LEGACY_SWITCH_ANTENNA1: 1482 case IWL_LEGACY_SWITCH_ANTENNA2: 1483 IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n"); 1484 1485 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 && 1486 tx_chains_num <= 1) || 1487 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 && 1488 tx_chains_num <= 2)) 1489 break; 1490 1491 /* Don't change antenna if success has been great */ 1492 if (window->success_ratio >= IWL_RS_GOOD_RATIO && 1493 !priv->bt_full_concurrent && 1494 priv->bt_traffic_load == 1495 IWL_BT_COEX_TRAFFIC_LOAD_NONE) 1496 break; 1497 1498 /* Set up search table to try other antenna */ 1499 memcpy(search_tbl, tbl, sz); 1500 1501 if (rs_toggle_antenna(valid_tx_ant, 1502 &search_tbl->current_rate, search_tbl)) { 1503 update_search_tbl_counter = 1; 1504 rs_set_expected_tpt_table(lq_sta, search_tbl); 1505 goto out; 1506 } 1507 break; 1508 case IWL_LEGACY_SWITCH_SISO: 1509 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n"); 1510 1511 /* Set up search table to try SISO */ 1512 memcpy(search_tbl, tbl, sz); 1513 search_tbl->is_SGI = 0; 1514 ret = rs_switch_to_siso(priv, lq_sta, conf, sta, 1515 search_tbl, index); 1516 if (!ret) { 1517 lq_sta->action_counter = 0; 1518 goto out; 1519 } 1520 1521 break; 1522 case IWL_LEGACY_SWITCH_MIMO2_AB: 1523 case IWL_LEGACY_SWITCH_MIMO2_AC: 1524 case IWL_LEGACY_SWITCH_MIMO2_BC: 1525 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n"); 1526 1527 /* Set up search table to try MIMO */ 1528 memcpy(search_tbl, tbl, sz); 1529 search_tbl->is_SGI = 0; 1530 1531 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB) 1532 search_tbl->ant_type = ANT_AB; 1533 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC) 1534 search_tbl->ant_type = ANT_AC; 1535 else 1536 search_tbl->ant_type = ANT_BC; 1537 1538 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 1539 break; 1540 1541 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta, 1542 search_tbl, index); 1543 if (!ret) { 1544 lq_sta->action_counter = 0; 1545 goto out; 1546 } 1547 break; 1548 1549 case IWL_LEGACY_SWITCH_MIMO3_ABC: 1550 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n"); 1551 1552 /* Set up search table to try MIMO3 */ 1553 memcpy(search_tbl, tbl, sz); 1554 search_tbl->is_SGI = 0; 1555 1556 search_tbl->ant_type = ANT_ABC; 1557 1558 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 1559 break; 1560 1561 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta, 1562 search_tbl, index); 1563 if (!ret) { 1564 lq_sta->action_counter = 0; 1565 goto out; 1566 } 1567 break; 1568 } 1569 tbl->action++; 1570 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC) 1571 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1; 1572 1573 if (tbl->action == start_action) 1574 break; 1575 1576 } 1577 search_tbl->lq_type = LQ_NONE; 1578 return 0; 1579 1580out: 1581 lq_sta->search_better_tbl = 1; 1582 tbl->action++; 1583 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC) 1584 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1; 1585 if (update_search_tbl_counter) 1586 search_tbl->action = tbl->action; 1587 return 0; 1588 1589} 1590 1591/* 1592 * Try to switch to new modulation mode from SISO 1593 */ 1594static int rs_move_siso_to_other(struct iwl_priv *priv, 1595 struct iwl_lq_sta *lq_sta, 1596 struct ieee80211_conf *conf, 1597 struct ieee80211_sta *sta, int index) 1598{ 1599 u8 is_green = lq_sta->is_green; 1600 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1601 struct iwl_scale_tbl_info *search_tbl = 1602 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 1603 struct iwl_rate_scale_data *window = &(tbl->win[index]); 1604 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 1605 u32 sz = (sizeof(struct iwl_scale_tbl_info) - 1606 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); 1607 u8 start_action; 1608 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant; 1609 u8 tx_chains_num = priv->hw_params.tx_chains_num; 1610 u8 update_search_tbl_counter = 0; 1611 int ret; 1612 1613 switch (priv->bt_traffic_load) { 1614 case IWL_BT_COEX_TRAFFIC_LOAD_NONE: 1615 /* nothing */ 1616 break; 1617 case IWL_BT_COEX_TRAFFIC_LOAD_LOW: 1618 /* avoid antenna B unless MIMO */ 1619 if (tbl->action == IWL_SISO_SWITCH_ANTENNA2) 1620 tbl->action = IWL_SISO_SWITCH_MIMO2_AB; 1621 break; 1622 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH: 1623 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS: 1624 /* avoid antenna B and MIMO */ 1625 valid_tx_ant = 1626 first_antenna(priv->nvm_data->valid_tx_ant); 1627 if (tbl->action != IWL_SISO_SWITCH_ANTENNA1) 1628 tbl->action = IWL_SISO_SWITCH_ANTENNA1; 1629 break; 1630 default: 1631 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load); 1632 break; 1633 } 1634 1635 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE && 1636 tbl->action > IWL_SISO_SWITCH_ANTENNA2) { 1637 /* stay in SISO */ 1638 tbl->action = IWL_SISO_SWITCH_ANTENNA1; 1639 } 1640 1641 /* configure as 1x1 if bt full concurrency */ 1642 if (priv->bt_full_concurrent) { 1643 valid_tx_ant = 1644 first_antenna(priv->nvm_data->valid_tx_ant); 1645 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2) 1646 tbl->action = IWL_SISO_SWITCH_ANTENNA1; 1647 } 1648 1649 start_action = tbl->action; 1650 for (;;) { 1651 lq_sta->action_counter++; 1652 switch (tbl->action) { 1653 case IWL_SISO_SWITCH_ANTENNA1: 1654 case IWL_SISO_SWITCH_ANTENNA2: 1655 IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n"); 1656 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 && 1657 tx_chains_num <= 1) || 1658 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 && 1659 tx_chains_num <= 2)) 1660 break; 1661 1662 if (window->success_ratio >= IWL_RS_GOOD_RATIO && 1663 !priv->bt_full_concurrent && 1664 priv->bt_traffic_load == 1665 IWL_BT_COEX_TRAFFIC_LOAD_NONE) 1666 break; 1667 1668 memcpy(search_tbl, tbl, sz); 1669 if (rs_toggle_antenna(valid_tx_ant, 1670 &search_tbl->current_rate, search_tbl)) { 1671 update_search_tbl_counter = 1; 1672 goto out; 1673 } 1674 break; 1675 case IWL_SISO_SWITCH_MIMO2_AB: 1676 case IWL_SISO_SWITCH_MIMO2_AC: 1677 case IWL_SISO_SWITCH_MIMO2_BC: 1678 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n"); 1679 memcpy(search_tbl, tbl, sz); 1680 search_tbl->is_SGI = 0; 1681 1682 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB) 1683 search_tbl->ant_type = ANT_AB; 1684 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC) 1685 search_tbl->ant_type = ANT_AC; 1686 else 1687 search_tbl->ant_type = ANT_BC; 1688 1689 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 1690 break; 1691 1692 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta, 1693 search_tbl, index); 1694 if (!ret) 1695 goto out; 1696 break; 1697 case IWL_SISO_SWITCH_GI: 1698 if (!tbl->is_ht40 && !(ht_cap->cap & 1699 IEEE80211_HT_CAP_SGI_20)) 1700 break; 1701 if (tbl->is_ht40 && !(ht_cap->cap & 1702 IEEE80211_HT_CAP_SGI_40)) 1703 break; 1704 1705 IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n"); 1706 1707 memcpy(search_tbl, tbl, sz); 1708 if (is_green) { 1709 if (!tbl->is_SGI) 1710 break; 1711 else 1712 IWL_ERR(priv, 1713 "SGI was set in GF+SISO\n"); 1714 } 1715 search_tbl->is_SGI = !tbl->is_SGI; 1716 rs_set_expected_tpt_table(lq_sta, search_tbl); 1717 if (tbl->is_SGI) { 1718 s32 tpt = lq_sta->last_tpt / 100; 1719 if (tpt >= search_tbl->expected_tpt[index]) 1720 break; 1721 } 1722 search_tbl->current_rate = 1723 rate_n_flags_from_tbl(priv, search_tbl, 1724 index, is_green); 1725 update_search_tbl_counter = 1; 1726 goto out; 1727 case IWL_SISO_SWITCH_MIMO3_ABC: 1728 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n"); 1729 memcpy(search_tbl, tbl, sz); 1730 search_tbl->is_SGI = 0; 1731 search_tbl->ant_type = ANT_ABC; 1732 1733 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 1734 break; 1735 1736 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta, 1737 search_tbl, index); 1738 if (!ret) 1739 goto out; 1740 break; 1741 } 1742 tbl->action++; 1743 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC) 1744 tbl->action = IWL_SISO_SWITCH_ANTENNA1; 1745 1746 if (tbl->action == start_action) 1747 break; 1748 } 1749 search_tbl->lq_type = LQ_NONE; 1750 return 0; 1751 1752 out: 1753 lq_sta->search_better_tbl = 1; 1754 tbl->action++; 1755 if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC) 1756 tbl->action = IWL_SISO_SWITCH_ANTENNA1; 1757 if (update_search_tbl_counter) 1758 search_tbl->action = tbl->action; 1759 1760 return 0; 1761} 1762 1763/* 1764 * Try to switch to new modulation mode from MIMO2 1765 */ 1766static int rs_move_mimo2_to_other(struct iwl_priv *priv, 1767 struct iwl_lq_sta *lq_sta, 1768 struct ieee80211_conf *conf, 1769 struct ieee80211_sta *sta, int index) 1770{ 1771 s8 is_green = lq_sta->is_green; 1772 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1773 struct iwl_scale_tbl_info *search_tbl = 1774 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 1775 struct iwl_rate_scale_data *window = &(tbl->win[index]); 1776 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 1777 u32 sz = (sizeof(struct iwl_scale_tbl_info) - 1778 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); 1779 u8 start_action; 1780 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant; 1781 u8 tx_chains_num = priv->hw_params.tx_chains_num; 1782 u8 update_search_tbl_counter = 0; 1783 int ret; 1784 1785 switch (priv->bt_traffic_load) { 1786 case IWL_BT_COEX_TRAFFIC_LOAD_NONE: 1787 /* nothing */ 1788 break; 1789 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH: 1790 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS: 1791 /* avoid antenna B and MIMO */ 1792 if (tbl->action != IWL_MIMO2_SWITCH_SISO_A) 1793 tbl->action = IWL_MIMO2_SWITCH_SISO_A; 1794 break; 1795 case IWL_BT_COEX_TRAFFIC_LOAD_LOW: 1796 /* avoid antenna B unless MIMO */ 1797 if (tbl->action == IWL_MIMO2_SWITCH_SISO_B || 1798 tbl->action == IWL_MIMO2_SWITCH_SISO_C) 1799 tbl->action = IWL_MIMO2_SWITCH_SISO_A; 1800 break; 1801 default: 1802 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load); 1803 break; 1804 } 1805 1806 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) && 1807 (tbl->action < IWL_MIMO2_SWITCH_SISO_A || 1808 tbl->action > IWL_MIMO2_SWITCH_SISO_C)) { 1809 /* switch in SISO */ 1810 tbl->action = IWL_MIMO2_SWITCH_SISO_A; 1811 } 1812 1813 /* configure as 1x1 if bt full concurrency */ 1814 if (priv->bt_full_concurrent && 1815 (tbl->action < IWL_MIMO2_SWITCH_SISO_A || 1816 tbl->action > IWL_MIMO2_SWITCH_SISO_C)) 1817 tbl->action = IWL_MIMO2_SWITCH_SISO_A; 1818 1819 start_action = tbl->action; 1820 for (;;) { 1821 lq_sta->action_counter++; 1822 switch (tbl->action) { 1823 case IWL_MIMO2_SWITCH_ANTENNA1: 1824 case IWL_MIMO2_SWITCH_ANTENNA2: 1825 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n"); 1826 1827 if (tx_chains_num <= 2) 1828 break; 1829 1830 if (window->success_ratio >= IWL_RS_GOOD_RATIO) 1831 break; 1832 1833 memcpy(search_tbl, tbl, sz); 1834 if (rs_toggle_antenna(valid_tx_ant, 1835 &search_tbl->current_rate, search_tbl)) { 1836 update_search_tbl_counter = 1; 1837 goto out; 1838 } 1839 break; 1840 case IWL_MIMO2_SWITCH_SISO_A: 1841 case IWL_MIMO2_SWITCH_SISO_B: 1842 case IWL_MIMO2_SWITCH_SISO_C: 1843 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n"); 1844 1845 /* Set up new search table for SISO */ 1846 memcpy(search_tbl, tbl, sz); 1847 1848 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A) 1849 search_tbl->ant_type = ANT_A; 1850 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B) 1851 search_tbl->ant_type = ANT_B; 1852 else 1853 search_tbl->ant_type = ANT_C; 1854 1855 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 1856 break; 1857 1858 ret = rs_switch_to_siso(priv, lq_sta, conf, sta, 1859 search_tbl, index); 1860 if (!ret) 1861 goto out; 1862 1863 break; 1864 1865 case IWL_MIMO2_SWITCH_GI: 1866 if (!tbl->is_ht40 && !(ht_cap->cap & 1867 IEEE80211_HT_CAP_SGI_20)) 1868 break; 1869 if (tbl->is_ht40 && !(ht_cap->cap & 1870 IEEE80211_HT_CAP_SGI_40)) 1871 break; 1872 1873 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n"); 1874 1875 /* Set up new search table for MIMO2 */ 1876 memcpy(search_tbl, tbl, sz); 1877 search_tbl->is_SGI = !tbl->is_SGI; 1878 rs_set_expected_tpt_table(lq_sta, search_tbl); 1879 /* 1880 * If active table already uses the fastest possible 1881 * modulation (dual stream with short guard interval), 1882 * and it's working well, there's no need to look 1883 * for a better type of modulation! 1884 */ 1885 if (tbl->is_SGI) { 1886 s32 tpt = lq_sta->last_tpt / 100; 1887 if (tpt >= search_tbl->expected_tpt[index]) 1888 break; 1889 } 1890 search_tbl->current_rate = 1891 rate_n_flags_from_tbl(priv, search_tbl, 1892 index, is_green); 1893 update_search_tbl_counter = 1; 1894 goto out; 1895 1896 case IWL_MIMO2_SWITCH_MIMO3_ABC: 1897 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n"); 1898 memcpy(search_tbl, tbl, sz); 1899 search_tbl->is_SGI = 0; 1900 search_tbl->ant_type = ANT_ABC; 1901 1902 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 1903 break; 1904 1905 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta, 1906 search_tbl, index); 1907 if (!ret) 1908 goto out; 1909 1910 break; 1911 } 1912 tbl->action++; 1913 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC) 1914 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1; 1915 1916 if (tbl->action == start_action) 1917 break; 1918 } 1919 search_tbl->lq_type = LQ_NONE; 1920 return 0; 1921 out: 1922 lq_sta->search_better_tbl = 1; 1923 tbl->action++; 1924 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC) 1925 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1; 1926 if (update_search_tbl_counter) 1927 search_tbl->action = tbl->action; 1928 1929 return 0; 1930 1931} 1932 1933/* 1934 * Try to switch to new modulation mode from MIMO3 1935 */ 1936static int rs_move_mimo3_to_other(struct iwl_priv *priv, 1937 struct iwl_lq_sta *lq_sta, 1938 struct ieee80211_conf *conf, 1939 struct ieee80211_sta *sta, int index) 1940{ 1941 s8 is_green = lq_sta->is_green; 1942 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1943 struct iwl_scale_tbl_info *search_tbl = 1944 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 1945 struct iwl_rate_scale_data *window = &(tbl->win[index]); 1946 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 1947 u32 sz = (sizeof(struct iwl_scale_tbl_info) - 1948 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); 1949 u8 start_action; 1950 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant; 1951 u8 tx_chains_num = priv->hw_params.tx_chains_num; 1952 int ret; 1953 u8 update_search_tbl_counter = 0; 1954 1955 switch (priv->bt_traffic_load) { 1956 case IWL_BT_COEX_TRAFFIC_LOAD_NONE: 1957 /* nothing */ 1958 break; 1959 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH: 1960 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS: 1961 /* avoid antenna B and MIMO */ 1962 if (tbl->action != IWL_MIMO3_SWITCH_SISO_A) 1963 tbl->action = IWL_MIMO3_SWITCH_SISO_A; 1964 break; 1965 case IWL_BT_COEX_TRAFFIC_LOAD_LOW: 1966 /* avoid antenna B unless MIMO */ 1967 if (tbl->action == IWL_MIMO3_SWITCH_SISO_B || 1968 tbl->action == IWL_MIMO3_SWITCH_SISO_C) 1969 tbl->action = IWL_MIMO3_SWITCH_SISO_A; 1970 break; 1971 default: 1972 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load); 1973 break; 1974 } 1975 1976 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) && 1977 (tbl->action < IWL_MIMO3_SWITCH_SISO_A || 1978 tbl->action > IWL_MIMO3_SWITCH_SISO_C)) { 1979 /* switch in SISO */ 1980 tbl->action = IWL_MIMO3_SWITCH_SISO_A; 1981 } 1982 1983 /* configure as 1x1 if bt full concurrency */ 1984 if (priv->bt_full_concurrent && 1985 (tbl->action < IWL_MIMO3_SWITCH_SISO_A || 1986 tbl->action > IWL_MIMO3_SWITCH_SISO_C)) 1987 tbl->action = IWL_MIMO3_SWITCH_SISO_A; 1988 1989 start_action = tbl->action; 1990 for (;;) { 1991 lq_sta->action_counter++; 1992 switch (tbl->action) { 1993 case IWL_MIMO3_SWITCH_ANTENNA1: 1994 case IWL_MIMO3_SWITCH_ANTENNA2: 1995 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n"); 1996 1997 if (tx_chains_num <= 3) 1998 break; 1999 2000 if (window->success_ratio >= IWL_RS_GOOD_RATIO) 2001 break; 2002 2003 memcpy(search_tbl, tbl, sz); 2004 if (rs_toggle_antenna(valid_tx_ant, 2005 &search_tbl->current_rate, search_tbl)) 2006 goto out; 2007 break; 2008 case IWL_MIMO3_SWITCH_SISO_A: 2009 case IWL_MIMO3_SWITCH_SISO_B: 2010 case IWL_MIMO3_SWITCH_SISO_C: 2011 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n"); 2012 2013 /* Set up new search table for SISO */ 2014 memcpy(search_tbl, tbl, sz); 2015 2016 if (tbl->action == IWL_MIMO3_SWITCH_SISO_A) 2017 search_tbl->ant_type = ANT_A; 2018 else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B) 2019 search_tbl->ant_type = ANT_B; 2020 else 2021 search_tbl->ant_type = ANT_C; 2022 2023 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 2024 break; 2025 2026 ret = rs_switch_to_siso(priv, lq_sta, conf, sta, 2027 search_tbl, index); 2028 if (!ret) 2029 goto out; 2030 2031 break; 2032 2033 case IWL_MIMO3_SWITCH_MIMO2_AB: 2034 case IWL_MIMO3_SWITCH_MIMO2_AC: 2035 case IWL_MIMO3_SWITCH_MIMO2_BC: 2036 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n"); 2037 2038 memcpy(search_tbl, tbl, sz); 2039 search_tbl->is_SGI = 0; 2040 if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB) 2041 search_tbl->ant_type = ANT_AB; 2042 else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC) 2043 search_tbl->ant_type = ANT_AC; 2044 else 2045 search_tbl->ant_type = ANT_BC; 2046 2047 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 2048 break; 2049 2050 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta, 2051 search_tbl, index); 2052 if (!ret) 2053 goto out; 2054 2055 break; 2056 2057 case IWL_MIMO3_SWITCH_GI: 2058 if (!tbl->is_ht40 && !(ht_cap->cap & 2059 IEEE80211_HT_CAP_SGI_20)) 2060 break; 2061 if (tbl->is_ht40 && !(ht_cap->cap & 2062 IEEE80211_HT_CAP_SGI_40)) 2063 break; 2064 2065 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n"); 2066 2067 /* Set up new search table for MIMO */ 2068 memcpy(search_tbl, tbl, sz); 2069 search_tbl->is_SGI = !tbl->is_SGI; 2070 rs_set_expected_tpt_table(lq_sta, search_tbl); 2071 /* 2072 * If active table already uses the fastest possible 2073 * modulation (dual stream with short guard interval), 2074 * and it's working well, there's no need to look 2075 * for a better type of modulation! 2076 */ 2077 if (tbl->is_SGI) { 2078 s32 tpt = lq_sta->last_tpt / 100; 2079 if (tpt >= search_tbl->expected_tpt[index]) 2080 break; 2081 } 2082 search_tbl->current_rate = 2083 rate_n_flags_from_tbl(priv, search_tbl, 2084 index, is_green); 2085 update_search_tbl_counter = 1; 2086 goto out; 2087 } 2088 tbl->action++; 2089 if (tbl->action > IWL_MIMO3_SWITCH_GI) 2090 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1; 2091 2092 if (tbl->action == start_action) 2093 break; 2094 } 2095 search_tbl->lq_type = LQ_NONE; 2096 return 0; 2097 out: 2098 lq_sta->search_better_tbl = 1; 2099 tbl->action++; 2100 if (tbl->action > IWL_MIMO3_SWITCH_GI) 2101 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1; 2102 if (update_search_tbl_counter) 2103 search_tbl->action = tbl->action; 2104 2105 return 0; 2106 2107} 2108 2109/* 2110 * Check whether we should continue using same modulation mode, or 2111 * begin search for a new mode, based on: 2112 * 1) # tx successes or failures while using this mode 2113 * 2) # times calling this function 2114 * 3) elapsed time in this mode (not used, for now) 2115 */ 2116static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search) 2117{ 2118 struct iwl_scale_tbl_info *tbl; 2119 int i; 2120 int active_tbl; 2121 int flush_interval_passed = 0; 2122 struct iwl_priv *priv; 2123 2124 priv = lq_sta->drv; 2125 active_tbl = lq_sta->active_tbl; 2126 2127 tbl = &(lq_sta->lq_info[active_tbl]); 2128 2129 /* If we've been disallowing search, see if we should now allow it */ 2130 if (lq_sta->stay_in_tbl) { 2131 2132 /* Elapsed time using current modulation mode */ 2133 if (lq_sta->flush_timer) 2134 flush_interval_passed = 2135 time_after(jiffies, 2136 (unsigned long)(lq_sta->flush_timer + 2137 IWL_RATE_SCALE_FLUSH_INTVL)); 2138 2139 /* 2140 * Check if we should allow search for new modulation mode. 2141 * If many frames have failed or succeeded, or we've used 2142 * this same modulation for a long time, allow search, and 2143 * reset history stats that keep track of whether we should 2144 * allow a new search. Also (below) reset all bitmaps and 2145 * stats in active history. 2146 */ 2147 if (force_search || 2148 (lq_sta->total_failed > lq_sta->max_failure_limit) || 2149 (lq_sta->total_success > lq_sta->max_success_limit) || 2150 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer) 2151 && (flush_interval_passed))) { 2152 IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n", 2153 lq_sta->total_failed, 2154 lq_sta->total_success, 2155 flush_interval_passed); 2156 2157 /* Allow search for new mode */ 2158 lq_sta->stay_in_tbl = 0; /* only place reset */ 2159 lq_sta->total_failed = 0; 2160 lq_sta->total_success = 0; 2161 lq_sta->flush_timer = 0; 2162 2163 /* 2164 * Else if we've used this modulation mode enough repetitions 2165 * (regardless of elapsed time or success/failure), reset 2166 * history bitmaps and rate-specific stats for all rates in 2167 * active table. 2168 */ 2169 } else { 2170 lq_sta->table_count++; 2171 if (lq_sta->table_count >= 2172 lq_sta->table_count_limit) { 2173 lq_sta->table_count = 0; 2174 2175 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n"); 2176 for (i = 0; i < IWL_RATE_COUNT; i++) 2177 rs_rate_scale_clear_window( 2178 &(tbl->win[i])); 2179 } 2180 } 2181 2182 /* If transitioning to allow "search", reset all history 2183 * bitmaps and stats in active table (this will become the new 2184 * "search" table). */ 2185 if (!lq_sta->stay_in_tbl) { 2186 for (i = 0; i < IWL_RATE_COUNT; i++) 2187 rs_rate_scale_clear_window(&(tbl->win[i])); 2188 } 2189 } 2190} 2191 2192/* 2193 * setup rate table in uCode 2194 */ 2195static void rs_update_rate_tbl(struct iwl_priv *priv, 2196 struct iwl_rxon_context *ctx, 2197 struct iwl_lq_sta *lq_sta, 2198 struct iwl_scale_tbl_info *tbl, 2199 int index, u8 is_green) 2200{ 2201 u32 rate; 2202 2203 /* Update uCode's rate table. */ 2204 rate = rate_n_flags_from_tbl(priv, tbl, index, is_green); 2205 rs_fill_link_cmd(priv, lq_sta, rate); 2206 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false); 2207} 2208 2209/* 2210 * Do rate scaling and search for new modulation mode. 2211 */ 2212static void rs_rate_scale_perform(struct iwl_priv *priv, 2213 struct sk_buff *skb, 2214 struct ieee80211_sta *sta, 2215 struct iwl_lq_sta *lq_sta) 2216{ 2217 struct ieee80211_hw *hw = priv->hw; 2218 struct ieee80211_conf *conf = &hw->conf; 2219 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2220 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 2221 int low = IWL_RATE_INVALID; 2222 int high = IWL_RATE_INVALID; 2223 int index; 2224 int i; 2225 struct iwl_rate_scale_data *window = NULL; 2226 int current_tpt = IWL_INVALID_VALUE; 2227 int low_tpt = IWL_INVALID_VALUE; 2228 int high_tpt = IWL_INVALID_VALUE; 2229 u32 fail_count; 2230 s8 scale_action = 0; 2231 u16 rate_mask; 2232 u8 update_lq = 0; 2233 struct iwl_scale_tbl_info *tbl, *tbl1; 2234 u16 rate_scale_index_msk = 0; 2235 u8 is_green = 0; 2236 u8 active_tbl = 0; 2237 u8 done_search = 0; 2238 u16 high_low; 2239 s32 sr; 2240 u8 tid = IWL_MAX_TID_COUNT; 2241 struct iwl_tid_data *tid_data; 2242 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv; 2243 struct iwl_rxon_context *ctx = sta_priv->ctx; 2244 2245 IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n"); 2246 2247 /* Send management frames and NO_ACK data using lowest rate. */ 2248 /* TODO: this could probably be improved.. */ 2249 if (!ieee80211_is_data(hdr->frame_control) || 2250 info->flags & IEEE80211_TX_CTL_NO_ACK) 2251 return; 2252 2253 lq_sta->supp_rates = sta->supp_rates[lq_sta->band]; 2254 2255 tid = rs_tl_add_packet(lq_sta, hdr); 2256 if ((tid != IWL_MAX_TID_COUNT) && 2257 (lq_sta->tx_agg_tid_en & (1 << tid))) { 2258 tid_data = &priv->tid_data[lq_sta->lq.sta_id][tid]; 2259 if (tid_data->agg.state == IWL_AGG_OFF) 2260 lq_sta->is_agg = 0; 2261 else 2262 lq_sta->is_agg = 1; 2263 } else 2264 lq_sta->is_agg = 0; 2265 2266 /* 2267 * Select rate-scale / modulation-mode table to work with in 2268 * the rest of this function: "search" if searching for better 2269 * modulation mode, or "active" if doing rate scaling within a mode. 2270 */ 2271 if (!lq_sta->search_better_tbl) 2272 active_tbl = lq_sta->active_tbl; 2273 else 2274 active_tbl = 1 - lq_sta->active_tbl; 2275 2276 tbl = &(lq_sta->lq_info[active_tbl]); 2277 if (is_legacy(tbl->lq_type)) 2278 lq_sta->is_green = 0; 2279 else 2280 lq_sta->is_green = rs_use_green(sta); 2281 is_green = lq_sta->is_green; 2282 2283 /* current tx rate */ 2284 index = lq_sta->last_txrate_idx; 2285 2286 IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index, 2287 tbl->lq_type); 2288 2289 /* rates available for this association, and for modulation mode */ 2290 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type); 2291 2292 IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask); 2293 2294 /* mask with station rate restriction */ 2295 if (is_legacy(tbl->lq_type)) { 2296 if (lq_sta->band == IEEE80211_BAND_5GHZ) 2297 /* supp_rates has no CCK bits in A mode */ 2298 rate_scale_index_msk = (u16) (rate_mask & 2299 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE)); 2300 else 2301 rate_scale_index_msk = (u16) (rate_mask & 2302 lq_sta->supp_rates); 2303 2304 } else 2305 rate_scale_index_msk = rate_mask; 2306 2307 if (!rate_scale_index_msk) 2308 rate_scale_index_msk = rate_mask; 2309 2310 if (!((1 << index) & rate_scale_index_msk)) { 2311 IWL_ERR(priv, "Current Rate is not valid\n"); 2312 if (lq_sta->search_better_tbl) { 2313 /* revert to active table if search table is not valid*/ 2314 tbl->lq_type = LQ_NONE; 2315 lq_sta->search_better_tbl = 0; 2316 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 2317 /* get "active" rate info */ 2318 index = iwl_hwrate_to_plcp_idx(tbl->current_rate); 2319 rs_update_rate_tbl(priv, ctx, lq_sta, tbl, 2320 index, is_green); 2321 } 2322 return; 2323 } 2324 2325 /* Get expected throughput table and history window for current rate */ 2326 if (!tbl->expected_tpt) { 2327 IWL_ERR(priv, "tbl->expected_tpt is NULL\n"); 2328 return; 2329 } 2330 2331 /* force user max rate if set by user */ 2332 if ((lq_sta->max_rate_idx != -1) && 2333 (lq_sta->max_rate_idx < index)) { 2334 index = lq_sta->max_rate_idx; 2335 update_lq = 1; 2336 window = &(tbl->win[index]); 2337 goto lq_update; 2338 } 2339 2340 window = &(tbl->win[index]); 2341 2342 /* 2343 * If there is not enough history to calculate actual average 2344 * throughput, keep analyzing results of more tx frames, without 2345 * changing rate or mode (bypass most of the rest of this function). 2346 * Set up new rate table in uCode only if old rate is not supported 2347 * in current association (use new rate found above). 2348 */ 2349 fail_count = window->counter - window->success_counter; 2350 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) && 2351 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) { 2352 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d " 2353 "for index %d\n", 2354 window->success_counter, window->counter, index); 2355 2356 /* Can't calculate this yet; not enough history */ 2357 window->average_tpt = IWL_INVALID_VALUE; 2358 2359 /* Should we stay with this modulation mode, 2360 * or search for a new one? */ 2361 rs_stay_in_table(lq_sta, false); 2362 2363 goto out; 2364 } 2365 /* Else we have enough samples; calculate estimate of 2366 * actual average throughput */ 2367 if (window->average_tpt != ((window->success_ratio * 2368 tbl->expected_tpt[index] + 64) / 128)) { 2369 IWL_ERR(priv, "expected_tpt should have been calculated by now\n"); 2370 window->average_tpt = ((window->success_ratio * 2371 tbl->expected_tpt[index] + 64) / 128); 2372 } 2373 2374 /* If we are searching for better modulation mode, check success. */ 2375 if (lq_sta->search_better_tbl && 2376 (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) { 2377 /* If good success, continue using the "search" mode; 2378 * no need to send new link quality command, since we're 2379 * continuing to use the setup that we've been trying. */ 2380 if (window->average_tpt > lq_sta->last_tpt) { 2381 2382 IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE " 2383 "suc=%d cur-tpt=%d old-tpt=%d\n", 2384 window->success_ratio, 2385 window->average_tpt, 2386 lq_sta->last_tpt); 2387 2388 if (!is_legacy(tbl->lq_type)) 2389 lq_sta->enable_counter = 1; 2390 2391 /* Swap tables; "search" becomes "active" */ 2392 lq_sta->active_tbl = active_tbl; 2393 current_tpt = window->average_tpt; 2394 2395 /* Else poor success; go back to mode in "active" table */ 2396 } else { 2397 2398 IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE " 2399 "suc=%d cur-tpt=%d old-tpt=%d\n", 2400 window->success_ratio, 2401 window->average_tpt, 2402 lq_sta->last_tpt); 2403 2404 /* Nullify "search" table */ 2405 tbl->lq_type = LQ_NONE; 2406 2407 /* Revert to "active" table */ 2408 active_tbl = lq_sta->active_tbl; 2409 tbl = &(lq_sta->lq_info[active_tbl]); 2410 2411 /* Revert to "active" rate and throughput info */ 2412 index = iwl_hwrate_to_plcp_idx(tbl->current_rate); 2413 current_tpt = lq_sta->last_tpt; 2414 2415 /* Need to set up a new rate table in uCode */ 2416 update_lq = 1; 2417 } 2418 2419 /* Either way, we've made a decision; modulation mode 2420 * search is done, allow rate adjustment next time. */ 2421 lq_sta->search_better_tbl = 0; 2422 done_search = 1; /* Don't switch modes below! */ 2423 goto lq_update; 2424 } 2425 2426 /* (Else) not in search of better modulation mode, try for better 2427 * starting rate, while staying in this mode. */ 2428 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk, 2429 tbl->lq_type); 2430 low = high_low & 0xff; 2431 high = (high_low >> 8) & 0xff; 2432 2433 /* If user set max rate, dont allow higher than user constrain */ 2434 if ((lq_sta->max_rate_idx != -1) && 2435 (lq_sta->max_rate_idx < high)) 2436 high = IWL_RATE_INVALID; 2437 2438 sr = window->success_ratio; 2439 2440 /* Collect measured throughputs for current and adjacent rates */ 2441 current_tpt = window->average_tpt; 2442 if (low != IWL_RATE_INVALID) 2443 low_tpt = tbl->win[low].average_tpt; 2444 if (high != IWL_RATE_INVALID) 2445 high_tpt = tbl->win[high].average_tpt; 2446 2447 scale_action = 0; 2448 2449 /* Too many failures, decrease rate */ 2450 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) { 2451 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n"); 2452 scale_action = -1; 2453 2454 /* No throughput measured yet for adjacent rates; try increase. */ 2455 } else if ((low_tpt == IWL_INVALID_VALUE) && 2456 (high_tpt == IWL_INVALID_VALUE)) { 2457 2458 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH) 2459 scale_action = 1; 2460 else if (low != IWL_RATE_INVALID) 2461 scale_action = 0; 2462 } 2463 2464 /* Both adjacent throughputs are measured, but neither one has better 2465 * throughput; we're using the best rate, don't change it! */ 2466 else if ((low_tpt != IWL_INVALID_VALUE) && 2467 (high_tpt != IWL_INVALID_VALUE) && 2468 (low_tpt < current_tpt) && 2469 (high_tpt < current_tpt)) 2470 scale_action = 0; 2471 2472 /* At least one adjacent rate's throughput is measured, 2473 * and may have better performance. */ 2474 else { 2475 /* Higher adjacent rate's throughput is measured */ 2476 if (high_tpt != IWL_INVALID_VALUE) { 2477 /* Higher rate has better throughput */ 2478 if (high_tpt > current_tpt && 2479 sr >= IWL_RATE_INCREASE_TH) { 2480 scale_action = 1; 2481 } else { 2482 scale_action = 0; 2483 } 2484 2485 /* Lower adjacent rate's throughput is measured */ 2486 } else if (low_tpt != IWL_INVALID_VALUE) { 2487 /* Lower rate has better throughput */ 2488 if (low_tpt > current_tpt) { 2489 IWL_DEBUG_RATE(priv, 2490 "decrease rate because of low tpt\n"); 2491 scale_action = -1; 2492 } else if (sr >= IWL_RATE_INCREASE_TH) { 2493 scale_action = 1; 2494 } 2495 } 2496 } 2497 2498 /* Sanity check; asked for decrease, but success rate or throughput 2499 * has been good at old rate. Don't change it. */ 2500 if ((scale_action == -1) && (low != IWL_RATE_INVALID) && 2501 ((sr > IWL_RATE_HIGH_TH) || 2502 (current_tpt > (100 * tbl->expected_tpt[low])))) 2503 scale_action = 0; 2504 if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type)) 2505 scale_action = -1; 2506 if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI && 2507 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) 2508 scale_action = -1; 2509 2510 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) && 2511 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) { 2512 if (lq_sta->last_bt_traffic > priv->bt_traffic_load) { 2513 /* 2514 * don't set scale_action, don't want to scale up if 2515 * the rate scale doesn't otherwise think that is a 2516 * good idea. 2517 */ 2518 } else if (lq_sta->last_bt_traffic <= priv->bt_traffic_load) { 2519 scale_action = -1; 2520 } 2521 } 2522 lq_sta->last_bt_traffic = priv->bt_traffic_load; 2523 2524 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) && 2525 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) { 2526 /* search for a new modulation */ 2527 rs_stay_in_table(lq_sta, true); 2528 goto lq_update; 2529 } 2530 2531 switch (scale_action) { 2532 case -1: 2533 /* Decrease starting rate, update uCode's rate table */ 2534 if (low != IWL_RATE_INVALID) { 2535 update_lq = 1; 2536 index = low; 2537 } 2538 2539 break; 2540 case 1: 2541 /* Increase starting rate, update uCode's rate table */ 2542 if (high != IWL_RATE_INVALID) { 2543 update_lq = 1; 2544 index = high; 2545 } 2546 2547 break; 2548 case 0: 2549 /* No change */ 2550 default: 2551 break; 2552 } 2553 2554 IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d " 2555 "high %d type %d\n", 2556 index, scale_action, low, high, tbl->lq_type); 2557 2558lq_update: 2559 /* Replace uCode's rate table for the destination station. */ 2560 if (update_lq) 2561 rs_update_rate_tbl(priv, ctx, lq_sta, tbl, index, is_green); 2562 2563 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) { 2564 /* Should we stay with this modulation mode, 2565 * or search for a new one? */ 2566 rs_stay_in_table(lq_sta, false); 2567 } 2568 /* 2569 * Search for new modulation mode if we're: 2570 * 1) Not changing rates right now 2571 * 2) Not just finishing up a search 2572 * 3) Allowing a new search 2573 */ 2574 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) { 2575 /* Save current throughput to compare with "search" throughput*/ 2576 lq_sta->last_tpt = current_tpt; 2577 2578 /* Select a new "search" modulation mode to try. 2579 * If one is found, set up the new "search" table. */ 2580 if (is_legacy(tbl->lq_type)) 2581 rs_move_legacy_other(priv, lq_sta, conf, sta, index); 2582 else if (is_siso(tbl->lq_type)) 2583 rs_move_siso_to_other(priv, lq_sta, conf, sta, index); 2584 else if (is_mimo2(tbl->lq_type)) 2585 rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index); 2586 else 2587 rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index); 2588 2589 /* If new "search" mode was selected, set up in uCode table */ 2590 if (lq_sta->search_better_tbl) { 2591 /* Access the "search" table, clear its history. */ 2592 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 2593 for (i = 0; i < IWL_RATE_COUNT; i++) 2594 rs_rate_scale_clear_window(&(tbl->win[i])); 2595 2596 /* Use new "search" start rate */ 2597 index = iwl_hwrate_to_plcp_idx(tbl->current_rate); 2598 2599 IWL_DEBUG_RATE(priv, "Switch current mcs: %X index: %d\n", 2600 tbl->current_rate, index); 2601 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate); 2602 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false); 2603 } else 2604 done_search = 1; 2605 } 2606 2607 if (done_search && !lq_sta->stay_in_tbl) { 2608 /* If the "active" (non-search) mode was legacy, 2609 * and we've tried switching antennas, 2610 * but we haven't been able to try HT modes (not available), 2611 * stay with best antenna legacy modulation for a while 2612 * before next round of mode comparisons. */ 2613 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]); 2614 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) && 2615 lq_sta->action_counter > tbl1->max_search) { 2616 IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n"); 2617 rs_set_stay_in_table(priv, 1, lq_sta); 2618 } 2619 2620 /* If we're in an HT mode, and all 3 mode switch actions 2621 * have been tried and compared, stay in this best modulation 2622 * mode for a while before next round of mode comparisons. */ 2623 if (lq_sta->enable_counter && 2624 (lq_sta->action_counter >= tbl1->max_search) && 2625 iwl_ht_enabled(priv)) { 2626 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) && 2627 (lq_sta->tx_agg_tid_en & (1 << tid)) && 2628 (tid != IWL_MAX_TID_COUNT)) { 2629 u8 sta_id = lq_sta->lq.sta_id; 2630 tid_data = &priv->tid_data[sta_id][tid]; 2631 if (tid_data->agg.state == IWL_AGG_OFF) { 2632 IWL_DEBUG_RATE(priv, 2633 "try to aggregate tid %d\n", 2634 tid); 2635 rs_tl_turn_on_agg(priv, tid, 2636 lq_sta, sta); 2637 } 2638 } 2639 rs_set_stay_in_table(priv, 0, lq_sta); 2640 } 2641 } 2642 2643out: 2644 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green); 2645 lq_sta->last_txrate_idx = index; 2646} 2647 2648/** 2649 * rs_initialize_lq - Initialize a station's hardware rate table 2650 * 2651 * The uCode's station table contains a table of fallback rates 2652 * for automatic fallback during transmission. 2653 * 2654 * NOTE: This sets up a default set of values. These will be replaced later 2655 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of 2656 * rc80211_simple. 2657 * 2658 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before 2659 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD, 2660 * which requires station table entry to exist). 2661 */ 2662static void rs_initialize_lq(struct iwl_priv *priv, 2663 struct ieee80211_sta *sta, 2664 struct iwl_lq_sta *lq_sta) 2665{ 2666 struct iwl_scale_tbl_info *tbl; 2667 int rate_idx; 2668 int i; 2669 u32 rate; 2670 u8 use_green = rs_use_green(sta); 2671 u8 active_tbl = 0; 2672 u8 valid_tx_ant; 2673 struct iwl_station_priv *sta_priv; 2674 struct iwl_rxon_context *ctx; 2675 2676 if (!sta || !lq_sta) 2677 return; 2678 2679 sta_priv = (void *)sta->drv_priv; 2680 ctx = sta_priv->ctx; 2681 2682 i = lq_sta->last_txrate_idx; 2683 2684 valid_tx_ant = priv->nvm_data->valid_tx_ant; 2685 2686 if (!lq_sta->search_better_tbl) 2687 active_tbl = lq_sta->active_tbl; 2688 else 2689 active_tbl = 1 - lq_sta->active_tbl; 2690 2691 tbl = &(lq_sta->lq_info[active_tbl]); 2692 2693 if ((i < 0) || (i >= IWL_RATE_COUNT)) 2694 i = 0; 2695 2696 rate = iwl_rates[i].plcp; 2697 tbl->ant_type = first_antenna(valid_tx_ant); 2698 rate |= tbl->ant_type << RATE_MCS_ANT_POS; 2699 2700 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE) 2701 rate |= RATE_MCS_CCK_MSK; 2702 2703 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx); 2704 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type)) 2705 rs_toggle_antenna(valid_tx_ant, &rate, tbl); 2706 2707 rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green); 2708 tbl->current_rate = rate; 2709 rs_set_expected_tpt_table(lq_sta, tbl); 2710 rs_fill_link_cmd(NULL, lq_sta, rate); 2711 priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq; 2712 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, 0, true); 2713} 2714 2715static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta, 2716 struct ieee80211_tx_rate_control *txrc) 2717{ 2718 2719 struct sk_buff *skb = txrc->skb; 2720 struct ieee80211_supported_band *sband = txrc->sband; 2721 struct iwl_op_mode *op_mode __maybe_unused = 2722 (struct iwl_op_mode *)priv_r; 2723 struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode); 2724 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2725 struct iwl_lq_sta *lq_sta = priv_sta; 2726 int rate_idx; 2727 2728 IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n"); 2729 2730 /* Get max rate if user set max rate */ 2731 if (lq_sta) { 2732 lq_sta->max_rate_idx = txrc->max_rate_idx; 2733 if ((sband->band == IEEE80211_BAND_5GHZ) && 2734 (lq_sta->max_rate_idx != -1)) 2735 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE; 2736 if ((lq_sta->max_rate_idx < 0) || 2737 (lq_sta->max_rate_idx >= IWL_RATE_COUNT)) 2738 lq_sta->max_rate_idx = -1; 2739 } 2740 2741 /* Treat uninitialized rate scaling data same as non-existing. */ 2742 if (lq_sta && !lq_sta->drv) { 2743 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n"); 2744 priv_sta = NULL; 2745 } 2746 2747 /* Send management frames and NO_ACK data using lowest rate. */ 2748 if (rate_control_send_low(sta, priv_sta, txrc)) 2749 return; 2750 2751 rate_idx = lq_sta->last_txrate_idx; 2752 2753 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) { 2754 rate_idx -= IWL_FIRST_OFDM_RATE; 2755 /* 6M and 9M shared same MCS index */ 2756 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0; 2757 if (rs_extract_rate(lq_sta->last_rate_n_flags) >= 2758 IWL_RATE_MIMO3_6M_PLCP) 2759 rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM); 2760 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >= 2761 IWL_RATE_MIMO2_6M_PLCP) 2762 rate_idx = rate_idx + MCS_INDEX_PER_STREAM; 2763 info->control.rates[0].flags = IEEE80211_TX_RC_MCS; 2764 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK) 2765 info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI; 2766 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK) 2767 info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA; 2768 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK) 2769 info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2770 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK) 2771 info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD; 2772 } else { 2773 /* Check for invalid rates */ 2774 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) || 2775 ((sband->band == IEEE80211_BAND_5GHZ) && 2776 (rate_idx < IWL_FIRST_OFDM_RATE))) 2777 rate_idx = rate_lowest_index(sband, sta); 2778 /* On valid 5 GHz rate, adjust index */ 2779 else if (sband->band == IEEE80211_BAND_5GHZ) 2780 rate_idx -= IWL_FIRST_OFDM_RATE; 2781 info->control.rates[0].flags = 0; 2782 } 2783 info->control.rates[0].idx = rate_idx; 2784 info->control.rates[0].count = 1; 2785} 2786 2787static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta, 2788 gfp_t gfp) 2789{ 2790 struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv; 2791 struct iwl_op_mode *op_mode __maybe_unused = 2792 (struct iwl_op_mode *)priv_rate; 2793 struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode); 2794 2795 IWL_DEBUG_RATE(priv, "create station rate scale window\n"); 2796 2797 return &sta_priv->lq_sta; 2798} 2799 2800/* 2801 * Called after adding a new station to initialize rate scaling 2802 */ 2803void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id) 2804{ 2805 int i, j; 2806 struct ieee80211_hw *hw = priv->hw; 2807 struct ieee80211_conf *conf = &priv->hw->conf; 2808 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 2809 struct iwl_station_priv *sta_priv; 2810 struct iwl_lq_sta *lq_sta; 2811 struct ieee80211_supported_band *sband; 2812 unsigned long supp; /* must be unsigned long for for_each_set_bit */ 2813 2814 sta_priv = (struct iwl_station_priv *) sta->drv_priv; 2815 lq_sta = &sta_priv->lq_sta; 2816 sband = hw->wiphy->bands[conf->chandef.chan->band]; 2817 2818 2819 lq_sta->lq.sta_id = sta_id; 2820 2821 for (j = 0; j < LQ_SIZE; j++) 2822 for (i = 0; i < IWL_RATE_COUNT; i++) 2823 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]); 2824 2825 lq_sta->flush_timer = 0; 2826 lq_sta->supp_rates = sta->supp_rates[sband->band]; 2827 2828 IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n", 2829 sta_id); 2830 /* TODO: what is a good starting rate for STA? About middle? Maybe not 2831 * the lowest or the highest rate.. Could consider using RSSI from 2832 * previous packets? Need to have IEEE 802.1X auth succeed immediately 2833 * after assoc.. */ 2834 2835 lq_sta->is_dup = 0; 2836 lq_sta->max_rate_idx = -1; 2837 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX; 2838 lq_sta->is_green = rs_use_green(sta); 2839 lq_sta->band = sband->band; 2840 /* 2841 * active legacy rates as per supported rates bitmap 2842 */ 2843 supp = sta->supp_rates[sband->band]; 2844 lq_sta->active_legacy_rate = 0; 2845 for_each_set_bit(i, &supp, BITS_PER_LONG) 2846 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value); 2847 2848 /* 2849 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3), 2850 * supp_rates[] does not; shift to convert format, force 9 MBits off. 2851 */ 2852 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1; 2853 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1; 2854 lq_sta->active_siso_rate &= ~((u16)0x2); 2855 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE; 2856 2857 /* Same here */ 2858 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1; 2859 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1; 2860 lq_sta->active_mimo2_rate &= ~((u16)0x2); 2861 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE; 2862 2863 lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1; 2864 lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1; 2865 lq_sta->active_mimo3_rate &= ~((u16)0x2); 2866 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE; 2867 2868 IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n", 2869 lq_sta->active_siso_rate, 2870 lq_sta->active_mimo2_rate, 2871 lq_sta->active_mimo3_rate); 2872 2873 /* These values will be overridden later */ 2874 lq_sta->lq.general_params.single_stream_ant_msk = 2875 first_antenna(priv->nvm_data->valid_tx_ant); 2876 lq_sta->lq.general_params.dual_stream_ant_msk = 2877 priv->nvm_data->valid_tx_ant & 2878 ~first_antenna(priv->nvm_data->valid_tx_ant); 2879 if (!lq_sta->lq.general_params.dual_stream_ant_msk) { 2880 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB; 2881 } else if (num_of_ant(priv->nvm_data->valid_tx_ant) == 2) { 2882 lq_sta->lq.general_params.dual_stream_ant_msk = 2883 priv->nvm_data->valid_tx_ant; 2884 } 2885 2886 /* as default allow aggregation for all tids */ 2887 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID; 2888 lq_sta->drv = priv; 2889 2890 /* Set last_txrate_idx to lowest rate */ 2891 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta); 2892 if (sband->band == IEEE80211_BAND_5GHZ) 2893 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE; 2894 lq_sta->is_agg = 0; 2895#ifdef CONFIG_MAC80211_DEBUGFS 2896 lq_sta->dbg_fixed_rate = 0; 2897#endif 2898 2899 rs_initialize_lq(priv, sta, lq_sta); 2900} 2901 2902static void rs_fill_link_cmd(struct iwl_priv *priv, 2903 struct iwl_lq_sta *lq_sta, u32 new_rate) 2904{ 2905 struct iwl_scale_tbl_info tbl_type; 2906 int index = 0; 2907 int rate_idx; 2908 int repeat_rate = 0; 2909 u8 ant_toggle_cnt = 0; 2910 u8 use_ht_possible = 1; 2911 u8 valid_tx_ant = 0; 2912 struct iwl_station_priv *sta_priv = 2913 container_of(lq_sta, struct iwl_station_priv, lq_sta); 2914 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq; 2915 2916 /* Override starting rate (index 0) if needed for debug purposes */ 2917 rs_dbgfs_set_mcs(lq_sta, &new_rate, index); 2918 2919 /* Interpret new_rate (rate_n_flags) */ 2920 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, 2921 &tbl_type, &rate_idx); 2922 2923 if (priv && priv->bt_full_concurrent) { 2924 /* 1x1 only */ 2925 tbl_type.ant_type = 2926 first_antenna(priv->nvm_data->valid_tx_ant); 2927 } 2928 2929 /* How many times should we repeat the initial rate? */ 2930 if (is_legacy(tbl_type.lq_type)) { 2931 ant_toggle_cnt = 1; 2932 repeat_rate = IWL_NUMBER_TRY; 2933 } else { 2934 repeat_rate = min(IWL_HT_NUMBER_TRY, 2935 LINK_QUAL_AGG_DISABLE_START_DEF - 1); 2936 } 2937 2938 lq_cmd->general_params.mimo_delimiter = 2939 is_mimo(tbl_type.lq_type) ? 1 : 0; 2940 2941 /* Fill 1st table entry (index 0) */ 2942 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate); 2943 2944 if (num_of_ant(tbl_type.ant_type) == 1) { 2945 lq_cmd->general_params.single_stream_ant_msk = 2946 tbl_type.ant_type; 2947 } else if (num_of_ant(tbl_type.ant_type) == 2) { 2948 lq_cmd->general_params.dual_stream_ant_msk = 2949 tbl_type.ant_type; 2950 } /* otherwise we don't modify the existing value */ 2951 2952 index++; 2953 repeat_rate--; 2954 if (priv) { 2955 if (priv->bt_full_concurrent) 2956 valid_tx_ant = ANT_A; 2957 else 2958 valid_tx_ant = priv->nvm_data->valid_tx_ant; 2959 } 2960 2961 /* Fill rest of rate table */ 2962 while (index < LINK_QUAL_MAX_RETRY_NUM) { 2963 /* Repeat initial/next rate. 2964 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute. 2965 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */ 2966 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) { 2967 if (is_legacy(tbl_type.lq_type)) { 2968 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE) 2969 ant_toggle_cnt++; 2970 else if (priv && 2971 rs_toggle_antenna(valid_tx_ant, 2972 &new_rate, &tbl_type)) 2973 ant_toggle_cnt = 1; 2974 } 2975 2976 /* Override next rate if needed for debug purposes */ 2977 rs_dbgfs_set_mcs(lq_sta, &new_rate, index); 2978 2979 /* Fill next table entry */ 2980 lq_cmd->rs_table[index].rate_n_flags = 2981 cpu_to_le32(new_rate); 2982 repeat_rate--; 2983 index++; 2984 } 2985 2986 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type, 2987 &rate_idx); 2988 2989 if (priv && priv->bt_full_concurrent) { 2990 /* 1x1 only */ 2991 tbl_type.ant_type = 2992 first_antenna(priv->nvm_data->valid_tx_ant); 2993 } 2994 2995 /* Indicate to uCode which entries might be MIMO. 2996 * If initial rate was MIMO, this will finally end up 2997 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */ 2998 if (is_mimo(tbl_type.lq_type)) 2999 lq_cmd->general_params.mimo_delimiter = index; 3000 3001 /* Get next rate */ 3002 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx, 3003 use_ht_possible); 3004 3005 /* How many times should we repeat the next rate? */ 3006 if (is_legacy(tbl_type.lq_type)) { 3007 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE) 3008 ant_toggle_cnt++; 3009 else if (priv && 3010 rs_toggle_antenna(valid_tx_ant, 3011 &new_rate, &tbl_type)) 3012 ant_toggle_cnt = 1; 3013 3014 repeat_rate = IWL_NUMBER_TRY; 3015 } else { 3016 repeat_rate = IWL_HT_NUMBER_TRY; 3017 } 3018 3019 /* Don't allow HT rates after next pass. 3020 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */ 3021 use_ht_possible = 0; 3022 3023 /* Override next rate if needed for debug purposes */ 3024 rs_dbgfs_set_mcs(lq_sta, &new_rate, index); 3025 3026 /* Fill next table entry */ 3027 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate); 3028 3029 index++; 3030 repeat_rate--; 3031 } 3032 3033 lq_cmd->agg_params.agg_frame_cnt_limit = 3034 sta_priv->max_agg_bufsize ?: LINK_QUAL_AGG_FRAME_LIMIT_DEF; 3035 lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF; 3036 3037 lq_cmd->agg_params.agg_time_limit = 3038 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF); 3039 /* 3040 * overwrite if needed, pass aggregation time limit 3041 * to uCode in uSec 3042 */ 3043 if (priv && priv->lib->bt_params && 3044 priv->lib->bt_params->agg_time_limit && 3045 priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) 3046 lq_cmd->agg_params.agg_time_limit = 3047 cpu_to_le16(priv->lib->bt_params->agg_time_limit); 3048} 3049 3050static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) 3051{ 3052 return hw->priv; 3053} 3054/* rate scale requires free function to be implemented */ 3055static void rs_free(void *priv_rate) 3056{ 3057 return; 3058} 3059 3060static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta, 3061 void *priv_sta) 3062{ 3063 struct iwl_op_mode *op_mode __maybe_unused = priv_r; 3064 struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode); 3065 3066 IWL_DEBUG_RATE(priv, "enter\n"); 3067 IWL_DEBUG_RATE(priv, "leave\n"); 3068} 3069 3070#ifdef CONFIG_MAC80211_DEBUGFS 3071static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta, 3072 u32 *rate_n_flags, int index) 3073{ 3074 struct iwl_priv *priv; 3075 u8 valid_tx_ant; 3076 u8 ant_sel_tx; 3077 3078 priv = lq_sta->drv; 3079 valid_tx_ant = priv->nvm_data->valid_tx_ant; 3080 if (lq_sta->dbg_fixed_rate) { 3081 ant_sel_tx = 3082 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK) 3083 >> RATE_MCS_ANT_POS); 3084 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) { 3085 *rate_n_flags = lq_sta->dbg_fixed_rate; 3086 IWL_DEBUG_RATE(priv, "Fixed rate ON\n"); 3087 } else { 3088 lq_sta->dbg_fixed_rate = 0; 3089 IWL_ERR(priv, 3090 "Invalid antenna selection 0x%X, Valid is 0x%X\n", 3091 ant_sel_tx, valid_tx_ant); 3092 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n"); 3093 } 3094 } else { 3095 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n"); 3096 } 3097} 3098 3099static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file, 3100 const char __user *user_buf, size_t count, loff_t *ppos) 3101{ 3102 struct iwl_lq_sta *lq_sta = file->private_data; 3103 struct iwl_priv *priv; 3104 char buf[64]; 3105 size_t buf_size; 3106 u32 parsed_rate; 3107 3108 3109 priv = lq_sta->drv; 3110 memset(buf, 0, sizeof(buf)); 3111 buf_size = min(count, sizeof(buf) - 1); 3112 if (copy_from_user(buf, user_buf, buf_size)) 3113 return -EFAULT; 3114 3115 if (sscanf(buf, "%x", &parsed_rate) == 1) 3116 lq_sta->dbg_fixed_rate = parsed_rate; 3117 else 3118 lq_sta->dbg_fixed_rate = 0; 3119 3120 rs_program_fix_rate(priv, lq_sta); 3121 3122 return count; 3123} 3124 3125static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file, 3126 char __user *user_buf, size_t count, loff_t *ppos) 3127{ 3128 char *buff; 3129 int desc = 0; 3130 int i = 0; 3131 int index = 0; 3132 ssize_t ret; 3133 3134 struct iwl_lq_sta *lq_sta = file->private_data; 3135 struct iwl_priv *priv; 3136 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 3137 3138 priv = lq_sta->drv; 3139 buff = kmalloc(1024, GFP_KERNEL); 3140 if (!buff) 3141 return -ENOMEM; 3142 3143 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id); 3144 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n", 3145 lq_sta->total_failed, lq_sta->total_success, 3146 lq_sta->active_legacy_rate); 3147 desc += sprintf(buff+desc, "fixed rate 0x%X\n", 3148 lq_sta->dbg_fixed_rate); 3149 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n", 3150 (priv->nvm_data->valid_tx_ant & ANT_A) ? "ANT_A," : "", 3151 (priv->nvm_data->valid_tx_ant & ANT_B) ? "ANT_B," : "", 3152 (priv->nvm_data->valid_tx_ant & ANT_C) ? "ANT_C" : ""); 3153 desc += sprintf(buff+desc, "lq type %s\n", 3154 (is_legacy(tbl->lq_type)) ? "legacy" : "HT"); 3155 if (is_Ht(tbl->lq_type)) { 3156 desc += sprintf(buff+desc, " %s", 3157 (is_siso(tbl->lq_type)) ? "SISO" : 3158 ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3")); 3159 desc += sprintf(buff+desc, " %s", 3160 (tbl->is_ht40) ? "40MHz" : "20MHz"); 3161 desc += sprintf(buff+desc, " %s %s %s\n", (tbl->is_SGI) ? "SGI" : "", 3162 (lq_sta->is_green) ? "GF enabled" : "", 3163 (lq_sta->is_agg) ? "AGG on" : ""); 3164 } 3165 desc += sprintf(buff+desc, "last tx rate=0x%X\n", 3166 lq_sta->last_rate_n_flags); 3167 desc += sprintf(buff+desc, "general:" 3168 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n", 3169 lq_sta->lq.general_params.flags, 3170 lq_sta->lq.general_params.mimo_delimiter, 3171 lq_sta->lq.general_params.single_stream_ant_msk, 3172 lq_sta->lq.general_params.dual_stream_ant_msk); 3173 3174 desc += sprintf(buff+desc, "agg:" 3175 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n", 3176 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit), 3177 lq_sta->lq.agg_params.agg_dis_start_th, 3178 lq_sta->lq.agg_params.agg_frame_cnt_limit); 3179 3180 desc += sprintf(buff+desc, 3181 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n", 3182 lq_sta->lq.general_params.start_rate_index[0], 3183 lq_sta->lq.general_params.start_rate_index[1], 3184 lq_sta->lq.general_params.start_rate_index[2], 3185 lq_sta->lq.general_params.start_rate_index[3]); 3186 3187 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) { 3188 index = iwl_hwrate_to_plcp_idx( 3189 le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags)); 3190 if (is_legacy(tbl->lq_type)) { 3191 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n", 3192 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags), 3193 iwl_rate_mcs[index].mbps); 3194 } else { 3195 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n", 3196 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags), 3197 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs); 3198 } 3199 } 3200 3201 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3202 kfree(buff); 3203 return ret; 3204} 3205 3206static const struct file_operations rs_sta_dbgfs_scale_table_ops = { 3207 .write = rs_sta_dbgfs_scale_table_write, 3208 .read = rs_sta_dbgfs_scale_table_read, 3209 .open = simple_open, 3210 .llseek = default_llseek, 3211}; 3212static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file, 3213 char __user *user_buf, size_t count, loff_t *ppos) 3214{ 3215 char *buff; 3216 int desc = 0; 3217 int i, j; 3218 ssize_t ret; 3219 3220 struct iwl_lq_sta *lq_sta = file->private_data; 3221 3222 buff = kmalloc(1024, GFP_KERNEL); 3223 if (!buff) 3224 return -ENOMEM; 3225 3226 for (i = 0; i < LQ_SIZE; i++) { 3227 desc += sprintf(buff+desc, 3228 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n" 3229 "rate=0x%X\n", 3230 lq_sta->active_tbl == i ? "*" : "x", 3231 lq_sta->lq_info[i].lq_type, 3232 lq_sta->lq_info[i].is_SGI, 3233 lq_sta->lq_info[i].is_ht40, 3234 lq_sta->lq_info[i].is_dup, 3235 lq_sta->is_green, 3236 lq_sta->lq_info[i].current_rate); 3237 for (j = 0; j < IWL_RATE_COUNT; j++) { 3238 desc += sprintf(buff+desc, 3239 "counter=%d success=%d %%=%d\n", 3240 lq_sta->lq_info[i].win[j].counter, 3241 lq_sta->lq_info[i].win[j].success_counter, 3242 lq_sta->lq_info[i].win[j].success_ratio); 3243 } 3244 } 3245 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3246 kfree(buff); 3247 return ret; 3248} 3249 3250static const struct file_operations rs_sta_dbgfs_stats_table_ops = { 3251 .read = rs_sta_dbgfs_stats_table_read, 3252 .open = simple_open, 3253 .llseek = default_llseek, 3254}; 3255 3256static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file, 3257 char __user *user_buf, size_t count, loff_t *ppos) 3258{ 3259 struct iwl_lq_sta *lq_sta = file->private_data; 3260 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl]; 3261 char buff[120]; 3262 int desc = 0; 3263 3264 if (is_Ht(tbl->lq_type)) 3265 desc += sprintf(buff+desc, 3266 "Bit Rate= %d Mb/s\n", 3267 tbl->expected_tpt[lq_sta->last_txrate_idx]); 3268 else 3269 desc += sprintf(buff+desc, 3270 "Bit Rate= %d Mb/s\n", 3271 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1); 3272 3273 return simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3274} 3275 3276static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = { 3277 .read = rs_sta_dbgfs_rate_scale_data_read, 3278 .open = simple_open, 3279 .llseek = default_llseek, 3280}; 3281 3282static void rs_add_debugfs(void *priv, void *priv_sta, 3283 struct dentry *dir) 3284{ 3285 struct iwl_lq_sta *lq_sta = priv_sta; 3286 lq_sta->rs_sta_dbgfs_scale_table_file = 3287 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir, 3288 lq_sta, &rs_sta_dbgfs_scale_table_ops); 3289 lq_sta->rs_sta_dbgfs_stats_table_file = 3290 debugfs_create_file("rate_stats_table", S_IRUSR, dir, 3291 lq_sta, &rs_sta_dbgfs_stats_table_ops); 3292 lq_sta->rs_sta_dbgfs_rate_scale_data_file = 3293 debugfs_create_file("rate_scale_data", S_IRUSR, dir, 3294 lq_sta, &rs_sta_dbgfs_rate_scale_data_ops); 3295 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file = 3296 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir, 3297 &lq_sta->tx_agg_tid_en); 3298 3299} 3300 3301static void rs_remove_debugfs(void *priv, void *priv_sta) 3302{ 3303 struct iwl_lq_sta *lq_sta = priv_sta; 3304 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file); 3305 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file); 3306 debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file); 3307 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file); 3308} 3309#endif 3310 3311/* 3312 * Initialization of rate scaling information is done by driver after 3313 * the station is added. Since mac80211 calls this function before a 3314 * station is added we ignore it. 3315 */ 3316static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband, 3317 struct cfg80211_chan_def *chandef, 3318 struct ieee80211_sta *sta, void *priv_sta) 3319{ 3320} 3321 3322static const struct rate_control_ops rs_ops = { 3323 .name = RS_NAME, 3324 .tx_status = rs_tx_status, 3325 .get_rate = rs_get_rate, 3326 .rate_init = rs_rate_init_stub, 3327 .alloc = rs_alloc, 3328 .free = rs_free, 3329 .alloc_sta = rs_alloc_sta, 3330 .free_sta = rs_free_sta, 3331#ifdef CONFIG_MAC80211_DEBUGFS 3332 .add_sta_debugfs = rs_add_debugfs, 3333 .remove_sta_debugfs = rs_remove_debugfs, 3334#endif 3335}; 3336 3337int iwlagn_rate_control_register(void) 3338{ 3339 return ieee80211_rate_control_register(&rs_ops); 3340} 3341 3342void iwlagn_rate_control_unregister(void) 3343{ 3344 ieee80211_rate_control_unregister(&rs_ops); 3345} 3346 3347