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 * The full GNU General Public License is included in this distribution in the 15 * file called LICENSE. 16 * 17 * Contact Information: 18 * Intel Linux Wireless <linuxwifi@intel.com> 19 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 20 * 21 *****************************************************************************/ 22 #include <linux/kernel.h> 23 #include <linux/skbuff.h> 24 #include <linux/slab.h> 25 #include <net/mac80211.h> 26 27 #include <linux/netdevice.h> 28 #include <linux/etherdevice.h> 29 #include <linux/delay.h> 30 31 #include <linux/workqueue.h> 32 33 #include "dev.h" 34 #include "agn.h" 35 36 #define RS_NAME "iwl-agn-rs" 37 38 #define NUM_TRY_BEFORE_ANT_TOGGLE 1 39 #define IWL_NUMBER_TRY 1 40 #define IWL_HT_NUMBER_TRY 3 41 42 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */ 43 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */ 44 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */ 45 46 /* max allowed rate miss before sync LQ cmd */ 47 #define IWL_MISSED_RATE_MAX 15 48 /* max time to accum history 2 seconds */ 49 #define IWL_RATE_SCALE_FLUSH_INTVL (3*HZ) 50 51 static u8 rs_ht_to_legacy[] = { 52 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX, 53 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX, 54 IWL_RATE_6M_INDEX, 55 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX, 56 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX, 57 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX, 58 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX 59 }; 60 61 static const u8 ant_toggle_lookup[] = { 62 /*ANT_NONE -> */ ANT_NONE, 63 /*ANT_A -> */ ANT_B, 64 /*ANT_B -> */ ANT_C, 65 /*ANT_AB -> */ ANT_BC, 66 /*ANT_C -> */ ANT_A, 67 /*ANT_AC -> */ ANT_AB, 68 /*ANT_BC -> */ ANT_AC, 69 /*ANT_ABC -> */ ANT_ABC, 70 }; 71 72 #define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np) \ 73 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \ 74 IWL_RATE_SISO_##s##M_PLCP, \ 75 IWL_RATE_MIMO2_##s##M_PLCP,\ 76 IWL_RATE_MIMO3_##s##M_PLCP,\ 77 IWL_RATE_##r##M_IEEE, \ 78 IWL_RATE_##ip##M_INDEX, \ 79 IWL_RATE_##in##M_INDEX, \ 80 IWL_RATE_##rp##M_INDEX, \ 81 IWL_RATE_##rn##M_INDEX, \ 82 IWL_RATE_##pp##M_INDEX, \ 83 IWL_RATE_##np##M_INDEX } 84 85 /* 86 * Parameter order: 87 * rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate 88 * 89 * If there isn't a valid next or previous rate then INV is used which 90 * maps to IWL_RATE_INVALID 91 * 92 */ 93 const struct iwl_rate_info iwl_rates[IWL_RATE_COUNT] = { 94 IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2), /* 1mbps */ 95 IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5), /* 2mbps */ 96 IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11), /*5.5mbps */ 97 IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18), /* 11mbps */ 98 IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11), /* 6mbps */ 99 IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11), /* 9mbps */ 100 IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18), /* 12mbps */ 101 IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24), /* 18mbps */ 102 IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36), /* 24mbps */ 103 IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48), /* 36mbps */ 104 IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54), /* 48mbps */ 105 IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */ 106 IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */ 107 /* FIXME:RS: ^^ should be INV (legacy) */ 108 }; 109 110 static inline u8 rs_extract_rate(u32 rate_n_flags) 111 { 112 return (u8)(rate_n_flags & RATE_MCS_RATE_MSK); 113 } 114 115 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags) 116 { 117 int idx = 0; 118 119 /* HT rate format */ 120 if (rate_n_flags & RATE_MCS_HT_MSK) { 121 idx = rs_extract_rate(rate_n_flags); 122 123 if (idx >= IWL_RATE_MIMO3_6M_PLCP) 124 idx = idx - IWL_RATE_MIMO3_6M_PLCP; 125 else if (idx >= IWL_RATE_MIMO2_6M_PLCP) 126 idx = idx - IWL_RATE_MIMO2_6M_PLCP; 127 128 idx += IWL_FIRST_OFDM_RATE; 129 /* skip 9M not supported in ht*/ 130 if (idx >= IWL_RATE_9M_INDEX) 131 idx += 1; 132 if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE)) 133 return idx; 134 135 /* legacy rate format, search for match in table */ 136 } else { 137 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++) 138 if (iwl_rates[idx].plcp == 139 rs_extract_rate(rate_n_flags)) 140 return idx; 141 } 142 143 return -1; 144 } 145 146 static void rs_rate_scale_perform(struct iwl_priv *priv, 147 struct sk_buff *skb, 148 struct ieee80211_sta *sta, 149 struct iwl_lq_sta *lq_sta); 150 static void rs_fill_link_cmd(struct iwl_priv *priv, 151 struct iwl_lq_sta *lq_sta, u32 rate_n_flags); 152 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search); 153 154 155 #ifdef CONFIG_MAC80211_DEBUGFS 156 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta, 157 u32 *rate_n_flags, int index); 158 #else 159 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta, 160 u32 *rate_n_flags, int index) 161 {} 162 #endif 163 164 /** 165 * The following tables contain the expected throughput metrics for all rates 166 * 167 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits 168 * 169 * where invalid entries are zeros. 170 * 171 * CCK rates are only valid in legacy table and will only be used in G 172 * (2.4 GHz) band. 173 */ 174 175 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = { 176 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0 177 }; 178 179 static const u16 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = { 180 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202}, /* Norm */ 181 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210}, /* SGI */ 182 {0, 0, 0, 0, 47, 0, 91, 133, 171, 242, 305, 334, 362}, /* AGG */ 183 {0, 0, 0, 0, 52, 0, 101, 145, 187, 264, 330, 361, 390}, /* AGG+SGI */ 184 }; 185 186 static const u16 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = { 187 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */ 188 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */ 189 {0, 0, 0, 0, 94, 0, 177, 249, 313, 423, 512, 550, 586}, /* AGG */ 190 {0, 0, 0, 0, 104, 0, 193, 270, 338, 454, 545, 584, 620}, /* AGG+SGI */ 191 }; 192 193 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = { 194 {0, 0, 0, 0, 74, 0, 123, 155, 179, 214, 236, 244, 251}, /* Norm */ 195 {0, 0, 0, 0, 81, 0, 131, 164, 188, 223, 243, 251, 257}, /* SGI */ 196 {0, 0, 0, 0, 89, 0, 167, 235, 296, 402, 488, 526, 560}, /* AGG */ 197 {0, 0, 0, 0, 97, 0, 182, 255, 320, 431, 520, 558, 593}, /* AGG+SGI*/ 198 }; 199 200 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = { 201 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */ 202 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */ 203 {0, 0, 0, 0, 171, 0, 305, 410, 496, 634, 731, 771, 805}, /* AGG */ 204 {0, 0, 0, 0, 186, 0, 329, 439, 527, 667, 764, 803, 838}, /* AGG+SGI */ 205 }; 206 207 static const u16 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = { 208 {0, 0, 0, 0, 99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */ 209 {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */ 210 {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */ 211 {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */ 212 }; 213 214 static const u16 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = { 215 {0, 0, 0, 0, 152, 0, 211, 239, 255, 279, 290, 294, 297}, /* Norm */ 216 {0, 0, 0, 0, 160, 0, 219, 245, 261, 284, 294, 297, 300}, /* SGI */ 217 {0, 0, 0, 0, 254, 0, 443, 584, 695, 868, 984, 1030, 1070}, /* AGG */ 218 {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */ 219 }; 220 221 /* mbps, mcs */ 222 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = { 223 { "1", "BPSK DSSS"}, 224 { "2", "QPSK DSSS"}, 225 {"5.5", "BPSK CCK"}, 226 { "11", "QPSK CCK"}, 227 { "6", "BPSK 1/2"}, 228 { "9", "BPSK 1/2"}, 229 { "12", "QPSK 1/2"}, 230 { "18", "QPSK 3/4"}, 231 { "24", "16QAM 1/2"}, 232 { "36", "16QAM 3/4"}, 233 { "48", "64QAM 2/3"}, 234 { "54", "64QAM 3/4"}, 235 { "60", "64QAM 5/6"}, 236 }; 237 238 #define MCS_INDEX_PER_STREAM (8) 239 240 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window) 241 { 242 window->data = 0; 243 window->success_counter = 0; 244 window->success_ratio = IWL_INVALID_VALUE; 245 window->counter = 0; 246 window->average_tpt = IWL_INVALID_VALUE; 247 window->stamp = 0; 248 } 249 250 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type) 251 { 252 return (ant_type & valid_antenna) == ant_type; 253 } 254 255 /* 256 * removes the old data from the statistics. All data that is older than 257 * TID_MAX_TIME_DIFF, will be deleted. 258 */ 259 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time) 260 { 261 /* The oldest age we want to keep */ 262 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF; 263 264 while (tl->queue_count && 265 (tl->time_stamp < oldest_time)) { 266 tl->total -= tl->packet_count[tl->head]; 267 tl->packet_count[tl->head] = 0; 268 tl->time_stamp += TID_QUEUE_CELL_SPACING; 269 tl->queue_count--; 270 tl->head++; 271 if (tl->head >= TID_QUEUE_MAX_SIZE) 272 tl->head = 0; 273 } 274 } 275 276 /* 277 * increment traffic load value for tid and also remove 278 * any old values if passed the certain time period 279 */ 280 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data, 281 struct ieee80211_hdr *hdr) 282 { 283 u32 curr_time = jiffies_to_msecs(jiffies); 284 u32 time_diff; 285 s32 index; 286 struct iwl_traffic_load *tl = NULL; 287 u8 tid; 288 289 if (ieee80211_is_data_qos(hdr->frame_control)) { 290 u8 *qc = ieee80211_get_qos_ctl(hdr); 291 tid = qc[0] & 0xf; 292 } else 293 return IWL_MAX_TID_COUNT; 294 295 if (unlikely(tid >= IWL_MAX_TID_COUNT)) 296 return IWL_MAX_TID_COUNT; 297 298 tl = &lq_data->load[tid]; 299 300 curr_time -= curr_time % TID_ROUND_VALUE; 301 302 /* Happens only for the first packet. Initialize the data */ 303 if (!(tl->queue_count)) { 304 tl->total = 1; 305 tl->time_stamp = curr_time; 306 tl->queue_count = 1; 307 tl->head = 0; 308 tl->packet_count[0] = 1; 309 return IWL_MAX_TID_COUNT; 310 } 311 312 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time); 313 index = time_diff / TID_QUEUE_CELL_SPACING; 314 315 /* The history is too long: remove data that is older than */ 316 /* TID_MAX_TIME_DIFF */ 317 if (index >= TID_QUEUE_MAX_SIZE) 318 rs_tl_rm_old_stats(tl, curr_time); 319 320 index = (tl->head + index) % TID_QUEUE_MAX_SIZE; 321 tl->packet_count[index] = tl->packet_count[index] + 1; 322 tl->total = tl->total + 1; 323 324 if ((index + 1) > tl->queue_count) 325 tl->queue_count = index + 1; 326 327 return tid; 328 } 329 330 #ifdef CONFIG_MAC80211_DEBUGFS 331 /** 332 * Program the device to use fixed rate for frame transmit 333 * This is for debugging/testing only 334 * once the device start use fixed rate, we need to reload the module 335 * to being back the normal operation. 336 */ 337 static void rs_program_fix_rate(struct iwl_priv *priv, 338 struct iwl_lq_sta *lq_sta) 339 { 340 struct iwl_station_priv *sta_priv = 341 container_of(lq_sta, struct iwl_station_priv, lq_sta); 342 struct iwl_rxon_context *ctx = sta_priv->ctx; 343 344 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */ 345 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 346 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 347 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 348 349 IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n", 350 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate); 351 352 if (lq_sta->dbg_fixed_rate) { 353 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate); 354 iwl_send_lq_cmd(lq_sta->drv, ctx, &lq_sta->lq, CMD_ASYNC, 355 false); 356 } 357 } 358 #endif 359 360 /* 361 get the traffic load value for tid 362 */ 363 static void rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid) 364 { 365 u32 curr_time = jiffies_to_msecs(jiffies); 366 u32 time_diff; 367 s32 index; 368 struct iwl_traffic_load *tl = NULL; 369 370 if (tid >= IWL_MAX_TID_COUNT) 371 return; 372 373 tl = &(lq_data->load[tid]); 374 375 curr_time -= curr_time % TID_ROUND_VALUE; 376 377 if (!(tl->queue_count)) 378 return; 379 380 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time); 381 index = time_diff / TID_QUEUE_CELL_SPACING; 382 383 /* The history is too long: remove data that is older than */ 384 /* TID_MAX_TIME_DIFF */ 385 if (index >= TID_QUEUE_MAX_SIZE) 386 rs_tl_rm_old_stats(tl, curr_time); 387 } 388 389 static int rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv, 390 struct iwl_lq_sta *lq_data, u8 tid, 391 struct ieee80211_sta *sta) 392 { 393 int ret = -EAGAIN; 394 395 /* 396 * Don't create TX aggregation sessions when in high 397 * BT traffic, as they would just be disrupted by BT. 398 */ 399 if (priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) { 400 IWL_DEBUG_COEX(priv, 401 "BT traffic (%d), no aggregation allowed\n", 402 priv->bt_traffic_load); 403 return ret; 404 } 405 406 rs_tl_get_load(lq_data, tid); 407 408 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n", 409 sta->addr, tid); 410 ret = ieee80211_start_tx_ba_session(sta, tid, 5000); 411 if (ret == -EAGAIN) { 412 /* 413 * driver and mac80211 is out of sync 414 * this might be cause by reloading firmware 415 * stop the tx ba session here 416 */ 417 IWL_ERR(priv, "Fail start Tx agg on tid: %d\n", 418 tid); 419 ieee80211_stop_tx_ba_session(sta, tid); 420 } 421 return ret; 422 } 423 424 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid, 425 struct iwl_lq_sta *lq_data, 426 struct ieee80211_sta *sta) 427 { 428 if (tid < IWL_MAX_TID_COUNT) 429 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta); 430 else 431 IWL_ERR(priv, "tid exceeds max TID count: %d/%d\n", 432 tid, IWL_MAX_TID_COUNT); 433 } 434 435 static inline int get_num_of_ant_from_rate(u32 rate_n_flags) 436 { 437 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) + 438 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) + 439 !!(rate_n_flags & RATE_MCS_ANT_C_MSK); 440 } 441 442 /* 443 * Static function to get the expected throughput from an iwl_scale_tbl_info 444 * that wraps a NULL pointer check 445 */ 446 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index) 447 { 448 if (tbl->expected_tpt) 449 return tbl->expected_tpt[rs_index]; 450 return 0; 451 } 452 453 /** 454 * rs_collect_tx_data - Update the success/failure sliding window 455 * 456 * We keep a sliding window of the last 62 packets transmitted 457 * at this rate. window->data contains the bitmask of successful 458 * packets. 459 */ 460 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl, 461 int scale_index, int attempts, int successes) 462 { 463 struct iwl_rate_scale_data *window = NULL; 464 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1)); 465 s32 fail_count, tpt; 466 467 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT) 468 return -EINVAL; 469 470 /* Select window for current tx bit rate */ 471 window = &(tbl->win[scale_index]); 472 473 /* Get expected throughput */ 474 tpt = get_expected_tpt(tbl, scale_index); 475 476 /* 477 * Keep track of only the latest 62 tx frame attempts in this rate's 478 * history window; anything older isn't really relevant any more. 479 * If we have filled up the sliding window, drop the oldest attempt; 480 * if the oldest attempt (highest bit in bitmap) shows "success", 481 * subtract "1" from the success counter (this is the main reason 482 * we keep these bitmaps!). 483 */ 484 while (attempts > 0) { 485 if (window->counter >= IWL_RATE_MAX_WINDOW) { 486 487 /* remove earliest */ 488 window->counter = IWL_RATE_MAX_WINDOW - 1; 489 490 if (window->data & mask) { 491 window->data &= ~mask; 492 window->success_counter--; 493 } 494 } 495 496 /* Increment frames-attempted counter */ 497 window->counter++; 498 499 /* Shift bitmap by one frame to throw away oldest history */ 500 window->data <<= 1; 501 502 /* Mark the most recent #successes attempts as successful */ 503 if (successes > 0) { 504 window->success_counter++; 505 window->data |= 0x1; 506 successes--; 507 } 508 509 attempts--; 510 } 511 512 /* Calculate current success ratio, avoid divide-by-0! */ 513 if (window->counter > 0) 514 window->success_ratio = 128 * (100 * window->success_counter) 515 / window->counter; 516 else 517 window->success_ratio = IWL_INVALID_VALUE; 518 519 fail_count = window->counter - window->success_counter; 520 521 /* Calculate average throughput, if we have enough history. */ 522 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) || 523 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH)) 524 window->average_tpt = (window->success_ratio * tpt + 64) / 128; 525 else 526 window->average_tpt = IWL_INVALID_VALUE; 527 528 /* Tag this window as having been updated */ 529 window->stamp = jiffies; 530 531 return 0; 532 } 533 534 /* 535 * Fill uCode API rate_n_flags field, based on "search" or "active" table. 536 */ 537 /* FIXME:RS:remove this function and put the flags statically in the table */ 538 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv, 539 struct iwl_scale_tbl_info *tbl, 540 int index, u8 use_green) 541 { 542 u32 rate_n_flags = 0; 543 544 if (is_legacy(tbl->lq_type)) { 545 rate_n_flags = iwl_rates[index].plcp; 546 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE) 547 rate_n_flags |= RATE_MCS_CCK_MSK; 548 549 } else if (is_Ht(tbl->lq_type)) { 550 if (index > IWL_LAST_OFDM_RATE) { 551 IWL_ERR(priv, "Invalid HT rate index %d\n", index); 552 index = IWL_LAST_OFDM_RATE; 553 } 554 rate_n_flags = RATE_MCS_HT_MSK; 555 556 if (is_siso(tbl->lq_type)) 557 rate_n_flags |= iwl_rates[index].plcp_siso; 558 else if (is_mimo2(tbl->lq_type)) 559 rate_n_flags |= iwl_rates[index].plcp_mimo2; 560 else 561 rate_n_flags |= iwl_rates[index].plcp_mimo3; 562 } else { 563 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type); 564 } 565 566 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) & 567 RATE_MCS_ANT_ABC_MSK); 568 569 if (is_Ht(tbl->lq_type)) { 570 if (tbl->is_ht40) { 571 if (tbl->is_dup) 572 rate_n_flags |= RATE_MCS_DUP_MSK; 573 else 574 rate_n_flags |= RATE_MCS_HT40_MSK; 575 } 576 if (tbl->is_SGI) 577 rate_n_flags |= RATE_MCS_SGI_MSK; 578 579 if (use_green) { 580 rate_n_flags |= RATE_MCS_GF_MSK; 581 if (is_siso(tbl->lq_type) && tbl->is_SGI) { 582 rate_n_flags &= ~RATE_MCS_SGI_MSK; 583 IWL_ERR(priv, "GF was set with SGI:SISO\n"); 584 } 585 } 586 } 587 return rate_n_flags; 588 } 589 590 /* 591 * Interpret uCode API's rate_n_flags format, 592 * fill "search" or "active" tx mode table. 593 */ 594 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags, 595 enum nl80211_band band, 596 struct iwl_scale_tbl_info *tbl, 597 int *rate_idx) 598 { 599 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK); 600 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags); 601 u8 mcs; 602 603 memset(tbl, 0, sizeof(struct iwl_scale_tbl_info)); 604 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags); 605 606 if (*rate_idx == IWL_RATE_INVALID) { 607 *rate_idx = -1; 608 return -EINVAL; 609 } 610 tbl->is_SGI = 0; /* default legacy setup */ 611 tbl->is_ht40 = 0; 612 tbl->is_dup = 0; 613 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS); 614 tbl->lq_type = LQ_NONE; 615 tbl->max_search = IWL_MAX_SEARCH; 616 617 /* legacy rate format */ 618 if (!(rate_n_flags & RATE_MCS_HT_MSK)) { 619 if (num_of_ant == 1) { 620 if (band == NL80211_BAND_5GHZ) 621 tbl->lq_type = LQ_A; 622 else 623 tbl->lq_type = LQ_G; 624 } 625 /* HT rate format */ 626 } else { 627 if (rate_n_flags & RATE_MCS_SGI_MSK) 628 tbl->is_SGI = 1; 629 630 if ((rate_n_flags & RATE_MCS_HT40_MSK) || 631 (rate_n_flags & RATE_MCS_DUP_MSK)) 632 tbl->is_ht40 = 1; 633 634 if (rate_n_flags & RATE_MCS_DUP_MSK) 635 tbl->is_dup = 1; 636 637 mcs = rs_extract_rate(rate_n_flags); 638 639 /* SISO */ 640 if (mcs <= IWL_RATE_SISO_60M_PLCP) { 641 if (num_of_ant == 1) 642 tbl->lq_type = LQ_SISO; /*else NONE*/ 643 /* MIMO2 */ 644 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) { 645 if (num_of_ant == 2) 646 tbl->lq_type = LQ_MIMO2; 647 /* MIMO3 */ 648 } else { 649 if (num_of_ant == 3) { 650 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH; 651 tbl->lq_type = LQ_MIMO3; 652 } 653 } 654 } 655 return 0; 656 } 657 658 /* switch to another antenna/antennas and return 1 */ 659 /* if no other valid antenna found, return 0 */ 660 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags, 661 struct iwl_scale_tbl_info *tbl) 662 { 663 u8 new_ant_type; 664 665 if (!tbl->ant_type || tbl->ant_type > ANT_ABC) 666 return 0; 667 668 if (!rs_is_valid_ant(valid_ant, tbl->ant_type)) 669 return 0; 670 671 new_ant_type = ant_toggle_lookup[tbl->ant_type]; 672 673 while ((new_ant_type != tbl->ant_type) && 674 !rs_is_valid_ant(valid_ant, new_ant_type)) 675 new_ant_type = ant_toggle_lookup[new_ant_type]; 676 677 if (new_ant_type == tbl->ant_type) 678 return 0; 679 680 tbl->ant_type = new_ant_type; 681 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK; 682 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS; 683 return 1; 684 } 685 686 /** 687 * Green-field mode is valid if the station supports it and 688 * there are no non-GF stations present in the BSS. 689 */ 690 static bool rs_use_green(struct ieee80211_sta *sta) 691 { 692 /* 693 * There's a bug somewhere in this code that causes the 694 * scaling to get stuck because GF+SGI can't be combined 695 * in SISO rates. Until we find that bug, disable GF, it 696 * has only limited benefit and we still interoperate with 697 * GF APs since we can always receive GF transmissions. 698 */ 699 return false; 700 } 701 702 /** 703 * rs_get_supported_rates - get the available rates 704 * 705 * if management frame or broadcast frame only return 706 * basic available rates. 707 * 708 */ 709 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta, 710 struct ieee80211_hdr *hdr, 711 enum iwl_table_type rate_type) 712 { 713 if (is_legacy(rate_type)) { 714 return lq_sta->active_legacy_rate; 715 } else { 716 if (is_siso(rate_type)) 717 return lq_sta->active_siso_rate; 718 else if (is_mimo2(rate_type)) 719 return lq_sta->active_mimo2_rate; 720 else 721 return lq_sta->active_mimo3_rate; 722 } 723 } 724 725 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask, 726 int rate_type) 727 { 728 u8 high = IWL_RATE_INVALID; 729 u8 low = IWL_RATE_INVALID; 730 731 /* 802.11A or ht walks to the next literal adjacent rate in 732 * the rate table */ 733 if (is_a_band(rate_type) || !is_legacy(rate_type)) { 734 int i; 735 u32 mask; 736 737 /* Find the previous rate that is in the rate mask */ 738 i = index - 1; 739 if (i >= 0) 740 mask = BIT(i); 741 742 for (; i >= 0; i--, mask >>= 1) { 743 if (rate_mask & mask) { 744 low = i; 745 break; 746 } 747 } 748 749 /* Find the next rate that is in the rate mask */ 750 i = index + 1; 751 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) { 752 if (rate_mask & mask) { 753 high = i; 754 break; 755 } 756 } 757 758 return (high << 8) | low; 759 } 760 761 low = index; 762 while (low != IWL_RATE_INVALID) { 763 low = iwl_rates[low].prev_rs; 764 if (low == IWL_RATE_INVALID) 765 break; 766 if (rate_mask & (1 << low)) 767 break; 768 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low); 769 } 770 771 high = index; 772 while (high != IWL_RATE_INVALID) { 773 high = iwl_rates[high].next_rs; 774 if (high == IWL_RATE_INVALID) 775 break; 776 if (rate_mask & (1 << high)) 777 break; 778 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high); 779 } 780 781 return (high << 8) | low; 782 } 783 784 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta, 785 struct iwl_scale_tbl_info *tbl, 786 u8 scale_index, u8 ht_possible) 787 { 788 s32 low; 789 u16 rate_mask; 790 u16 high_low; 791 u8 switch_to_legacy = 0; 792 u8 is_green = lq_sta->is_green; 793 struct iwl_priv *priv = lq_sta->drv; 794 795 /* check if we need to switch from HT to legacy rates. 796 * assumption is that mandatory rates (1Mbps or 6Mbps) 797 * are always supported (spec demand) */ 798 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) { 799 switch_to_legacy = 1; 800 scale_index = rs_ht_to_legacy[scale_index]; 801 if (lq_sta->band == NL80211_BAND_5GHZ) 802 tbl->lq_type = LQ_A; 803 else 804 tbl->lq_type = LQ_G; 805 806 if (num_of_ant(tbl->ant_type) > 1) 807 tbl->ant_type = 808 first_antenna(priv->nvm_data->valid_tx_ant); 809 810 tbl->is_ht40 = 0; 811 tbl->is_SGI = 0; 812 tbl->max_search = IWL_MAX_SEARCH; 813 } 814 815 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type); 816 817 /* Mask with station rate restriction */ 818 if (is_legacy(tbl->lq_type)) { 819 /* supp_rates has no CCK bits in A mode */ 820 if (lq_sta->band == NL80211_BAND_5GHZ) 821 rate_mask = (u16)(rate_mask & 822 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE)); 823 else 824 rate_mask = (u16)(rate_mask & lq_sta->supp_rates); 825 } 826 827 /* If we switched from HT to legacy, check current rate */ 828 if (switch_to_legacy && (rate_mask & (1 << scale_index))) { 829 low = scale_index; 830 goto out; 831 } 832 833 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask, 834 tbl->lq_type); 835 low = high_low & 0xff; 836 837 if (low == IWL_RATE_INVALID) 838 low = scale_index; 839 840 out: 841 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green); 842 } 843 844 /* 845 * Simple function to compare two rate scale table types 846 */ 847 static bool table_type_matches(struct iwl_scale_tbl_info *a, 848 struct iwl_scale_tbl_info *b) 849 { 850 return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) && 851 (a->is_SGI == b->is_SGI); 852 } 853 854 static void rs_bt_update_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx, 855 struct iwl_lq_sta *lq_sta) 856 { 857 struct iwl_scale_tbl_info *tbl; 858 bool full_concurrent = priv->bt_full_concurrent; 859 860 if (priv->bt_ant_couple_ok) { 861 /* 862 * Is there a need to switch between 863 * full concurrency and 3-wire? 864 */ 865 if (priv->bt_ci_compliance && priv->bt_ant_couple_ok) 866 full_concurrent = true; 867 else 868 full_concurrent = false; 869 } 870 if ((priv->bt_traffic_load != priv->last_bt_traffic_load) || 871 (priv->bt_full_concurrent != full_concurrent)) { 872 priv->bt_full_concurrent = full_concurrent; 873 priv->last_bt_traffic_load = priv->bt_traffic_load; 874 875 /* Update uCode's rate table. */ 876 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 877 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate); 878 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false); 879 880 queue_work(priv->workqueue, &priv->bt_full_concurrency); 881 } 882 } 883 884 /* 885 * mac80211 sends us Tx status 886 */ 887 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband, 888 struct ieee80211_sta *sta, void *priv_sta, 889 struct sk_buff *skb) 890 { 891 int legacy_success; 892 int retries; 893 int rs_index, mac_index, i; 894 struct iwl_lq_sta *lq_sta = priv_sta; 895 struct iwl_link_quality_cmd *table; 896 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 897 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)priv_r; 898 struct iwl_priv *priv = IWL_OP_MODE_GET_DVM(op_mode); 899 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 900 enum mac80211_rate_control_flags mac_flags; 901 u32 tx_rate; 902 struct iwl_scale_tbl_info tbl_type; 903 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl; 904 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv; 905 struct iwl_rxon_context *ctx = sta_priv->ctx; 906 907 IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n"); 908 909 /* Treat uninitialized rate scaling data same as non-existing. */ 910 if (!lq_sta) { 911 IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n"); 912 return; 913 } else if (!lq_sta->drv) { 914 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n"); 915 return; 916 } 917 918 if (!ieee80211_is_data(hdr->frame_control) || 919 info->flags & IEEE80211_TX_CTL_NO_ACK) 920 return; 921 922 /* This packet was aggregated but doesn't carry status info */ 923 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 924 !(info->flags & IEEE80211_TX_STAT_AMPDU)) 925 return; 926 927 /* 928 * Ignore this Tx frame response if its initial rate doesn't match 929 * that of latest Link Quality command. There may be stragglers 930 * from a previous Link Quality command, but we're no longer interested 931 * in those; they're either from the "active" mode while we're trying 932 * to check "search" mode, or a prior "search" mode after we've moved 933 * to a new "search" mode (which might become the new "active" mode). 934 */ 935 table = &lq_sta->lq; 936 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags); 937 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index); 938 if (priv->band == NL80211_BAND_5GHZ) 939 rs_index -= IWL_FIRST_OFDM_RATE; 940 mac_flags = info->status.rates[0].flags; 941 mac_index = info->status.rates[0].idx; 942 /* For HT packets, map MCS to PLCP */ 943 if (mac_flags & IEEE80211_TX_RC_MCS) { 944 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */ 945 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE)) 946 mac_index++; 947 /* 948 * mac80211 HT index is always zero-indexed; we need to move 949 * HT OFDM rates after CCK rates in 2.4 GHz band 950 */ 951 if (priv->band == NL80211_BAND_2GHZ) 952 mac_index += IWL_FIRST_OFDM_RATE; 953 } 954 /* Here we actually compare this rate to the latest LQ command */ 955 if ((mac_index < 0) || 956 (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) || 957 (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) || 958 (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) || 959 (tbl_type.ant_type != info->status.antenna) || 960 (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) || 961 (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) || 962 (rs_index != mac_index)) { 963 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate); 964 /* 965 * Since rates mis-match, the last LQ command may have failed. 966 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with 967 * ... driver. 968 */ 969 lq_sta->missed_rate_counter++; 970 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) { 971 lq_sta->missed_rate_counter = 0; 972 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false); 973 } 974 /* Regardless, ignore this status info for outdated rate */ 975 return; 976 } else 977 /* Rate did match, so reset the missed_rate_counter */ 978 lq_sta->missed_rate_counter = 0; 979 980 /* Figure out if rate scale algorithm is in active or search table */ 981 if (table_type_matches(&tbl_type, 982 &(lq_sta->lq_info[lq_sta->active_tbl]))) { 983 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 984 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 985 } else if (table_type_matches(&tbl_type, 986 &lq_sta->lq_info[1 - lq_sta->active_tbl])) { 987 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 988 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 989 } else { 990 IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n"); 991 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 992 IWL_DEBUG_RATE(priv, "active- lq:%x, ant:%x, SGI:%d\n", 993 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI); 994 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 995 IWL_DEBUG_RATE(priv, "search- lq:%x, ant:%x, SGI:%d\n", 996 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI); 997 IWL_DEBUG_RATE(priv, "actual- lq:%x, ant:%x, SGI:%d\n", 998 tbl_type.lq_type, tbl_type.ant_type, tbl_type.is_SGI); 999 /* 1000 * no matching table found, let's by-pass the data collection 1001 * and continue to perform rate scale to find the rate table 1002 */ 1003 rs_stay_in_table(lq_sta, true); 1004 goto done; 1005 } 1006 1007 /* 1008 * Updating the frame history depends on whether packets were 1009 * aggregated. 1010 * 1011 * For aggregation, all packets were transmitted at the same rate, the 1012 * first index into rate scale table. 1013 */ 1014 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 1015 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags); 1016 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, 1017 &rs_index); 1018 rs_collect_tx_data(curr_tbl, rs_index, 1019 info->status.ampdu_len, 1020 info->status.ampdu_ack_len); 1021 1022 /* Update success/fail counts if not searching for new mode */ 1023 if (lq_sta->stay_in_tbl) { 1024 lq_sta->total_success += info->status.ampdu_ack_len; 1025 lq_sta->total_failed += (info->status.ampdu_len - 1026 info->status.ampdu_ack_len); 1027 } 1028 } else { 1029 /* 1030 * For legacy, update frame history with for each Tx retry. 1031 */ 1032 retries = info->status.rates[0].count - 1; 1033 /* HW doesn't send more than 15 retries */ 1034 retries = min(retries, 15); 1035 1036 /* The last transmission may have been successful */ 1037 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK); 1038 /* Collect data for each rate used during failed TX attempts */ 1039 for (i = 0; i <= retries; ++i) { 1040 tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags); 1041 rs_get_tbl_info_from_mcs(tx_rate, priv->band, 1042 &tbl_type, &rs_index); 1043 /* 1044 * Only collect stats if retried rate is in the same RS 1045 * table as active/search. 1046 */ 1047 if (table_type_matches(&tbl_type, curr_tbl)) 1048 tmp_tbl = curr_tbl; 1049 else if (table_type_matches(&tbl_type, other_tbl)) 1050 tmp_tbl = other_tbl; 1051 else 1052 continue; 1053 rs_collect_tx_data(tmp_tbl, rs_index, 1, 1054 i < retries ? 0 : legacy_success); 1055 } 1056 1057 /* Update success/fail counts if not searching for new mode */ 1058 if (lq_sta->stay_in_tbl) { 1059 lq_sta->total_success += legacy_success; 1060 lq_sta->total_failed += retries + (1 - legacy_success); 1061 } 1062 } 1063 /* The last TX rate is cached in lq_sta; it's set in if/else above */ 1064 lq_sta->last_rate_n_flags = tx_rate; 1065 done: 1066 /* See if there's a better rate or modulation mode to try. */ 1067 if (sta && sta->supp_rates[sband->band]) 1068 rs_rate_scale_perform(priv, skb, sta, lq_sta); 1069 1070 if (priv->lib->bt_params && priv->lib->bt_params->advanced_bt_coexist) 1071 rs_bt_update_lq(priv, ctx, lq_sta); 1072 } 1073 1074 /* 1075 * Begin a period of staying with a selected modulation mode. 1076 * Set "stay_in_tbl" flag to prevent any mode switches. 1077 * Set frame tx success limits according to legacy vs. high-throughput, 1078 * and reset overall (spanning all rates) tx success history statistics. 1079 * These control how long we stay using same modulation mode before 1080 * searching for a new mode. 1081 */ 1082 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy, 1083 struct iwl_lq_sta *lq_sta) 1084 { 1085 IWL_DEBUG_RATE(priv, "we are staying in the same table\n"); 1086 lq_sta->stay_in_tbl = 1; /* only place this gets set */ 1087 if (is_legacy) { 1088 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT; 1089 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT; 1090 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT; 1091 } else { 1092 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT; 1093 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT; 1094 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT; 1095 } 1096 lq_sta->table_count = 0; 1097 lq_sta->total_failed = 0; 1098 lq_sta->total_success = 0; 1099 lq_sta->flush_timer = jiffies; 1100 lq_sta->action_counter = 0; 1101 } 1102 1103 /* 1104 * Find correct throughput table for given mode of modulation 1105 */ 1106 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1107 struct iwl_scale_tbl_info *tbl) 1108 { 1109 /* Used to choose among HT tables */ 1110 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT]; 1111 1112 /* Check for invalid LQ type */ 1113 if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) { 1114 tbl->expected_tpt = expected_tpt_legacy; 1115 return; 1116 } 1117 1118 /* Legacy rates have only one table */ 1119 if (is_legacy(tbl->lq_type)) { 1120 tbl->expected_tpt = expected_tpt_legacy; 1121 return; 1122 } 1123 1124 /* Choose among many HT tables depending on number of streams 1125 * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation 1126 * status */ 1127 if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup)) 1128 ht_tbl_pointer = expected_tpt_siso20MHz; 1129 else if (is_siso(tbl->lq_type)) 1130 ht_tbl_pointer = expected_tpt_siso40MHz; 1131 else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup)) 1132 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1133 else if (is_mimo2(tbl->lq_type)) 1134 ht_tbl_pointer = expected_tpt_mimo2_40MHz; 1135 else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup)) 1136 ht_tbl_pointer = expected_tpt_mimo3_20MHz; 1137 else /* if (is_mimo3(tbl->lq_type)) <-- must be true */ 1138 ht_tbl_pointer = expected_tpt_mimo3_40MHz; 1139 1140 if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */ 1141 tbl->expected_tpt = ht_tbl_pointer[0]; 1142 else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */ 1143 tbl->expected_tpt = ht_tbl_pointer[1]; 1144 else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */ 1145 tbl->expected_tpt = ht_tbl_pointer[2]; 1146 else /* AGG+SGI */ 1147 tbl->expected_tpt = ht_tbl_pointer[3]; 1148 } 1149 1150 /* 1151 * Find starting rate for new "search" high-throughput mode of modulation. 1152 * Goal is to find lowest expected rate (under perfect conditions) that is 1153 * above the current measured throughput of "active" mode, to give new mode 1154 * a fair chance to prove itself without too many challenges. 1155 * 1156 * This gets called when transitioning to more aggressive modulation 1157 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive 1158 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need 1159 * to decrease to match "active" throughput. When moving from MIMO to SISO, 1160 * bit rate will typically need to increase, but not if performance was bad. 1161 */ 1162 static s32 rs_get_best_rate(struct iwl_priv *priv, 1163 struct iwl_lq_sta *lq_sta, 1164 struct iwl_scale_tbl_info *tbl, /* "search" */ 1165 u16 rate_mask, s8 index) 1166 { 1167 /* "active" values */ 1168 struct iwl_scale_tbl_info *active_tbl = 1169 &(lq_sta->lq_info[lq_sta->active_tbl]); 1170 s32 active_sr = active_tbl->win[index].success_ratio; 1171 s32 active_tpt = active_tbl->expected_tpt[index]; 1172 /* expected "search" throughput */ 1173 const u16 *tpt_tbl = tbl->expected_tpt; 1174 1175 s32 new_rate, high, low, start_hi; 1176 u16 high_low; 1177 s8 rate = index; 1178 1179 new_rate = high = low = start_hi = IWL_RATE_INVALID; 1180 1181 for (; ;) { 1182 high_low = rs_get_adjacent_rate(priv, rate, rate_mask, 1183 tbl->lq_type); 1184 1185 low = high_low & 0xff; 1186 high = (high_low >> 8) & 0xff; 1187 1188 /* 1189 * Lower the "search" bit rate, to give new "search" mode 1190 * approximately the same throughput as "active" if: 1191 * 1192 * 1) "Active" mode has been working modestly well (but not 1193 * great), and expected "search" throughput (under perfect 1194 * conditions) at candidate rate is above the actual 1195 * measured "active" throughput (but less than expected 1196 * "active" throughput under perfect conditions). 1197 * OR 1198 * 2) "Active" mode has been working perfectly or very well 1199 * and expected "search" throughput (under perfect 1200 * conditions) at candidate rate is above expected 1201 * "active" throughput (under perfect conditions). 1202 */ 1203 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) && 1204 ((active_sr > IWL_RATE_DECREASE_TH) && 1205 (active_sr <= IWL_RATE_HIGH_TH) && 1206 (tpt_tbl[rate] <= active_tpt))) || 1207 ((active_sr >= IWL_RATE_SCALE_SWITCH) && 1208 (tpt_tbl[rate] > active_tpt))) { 1209 1210 /* (2nd or later pass) 1211 * If we've already tried to raise the rate, and are 1212 * now trying to lower it, use the higher rate. */ 1213 if (start_hi != IWL_RATE_INVALID) { 1214 new_rate = start_hi; 1215 break; 1216 } 1217 1218 new_rate = rate; 1219 1220 /* Loop again with lower rate */ 1221 if (low != IWL_RATE_INVALID) 1222 rate = low; 1223 1224 /* Lower rate not available, use the original */ 1225 else 1226 break; 1227 1228 /* Else try to raise the "search" rate to match "active" */ 1229 } else { 1230 /* (2nd or later pass) 1231 * If we've already tried to lower the rate, and are 1232 * now trying to raise it, use the lower rate. */ 1233 if (new_rate != IWL_RATE_INVALID) 1234 break; 1235 1236 /* Loop again with higher rate */ 1237 else if (high != IWL_RATE_INVALID) { 1238 start_hi = high; 1239 rate = high; 1240 1241 /* Higher rate not available, use the original */ 1242 } else { 1243 new_rate = rate; 1244 break; 1245 } 1246 } 1247 } 1248 1249 return new_rate; 1250 } 1251 1252 /* 1253 * Set up search table for MIMO2 1254 */ 1255 static int rs_switch_to_mimo2(struct iwl_priv *priv, 1256 struct iwl_lq_sta *lq_sta, 1257 struct ieee80211_conf *conf, 1258 struct ieee80211_sta *sta, 1259 struct iwl_scale_tbl_info *tbl, int index) 1260 { 1261 u16 rate_mask; 1262 s32 rate; 1263 s8 is_green = lq_sta->is_green; 1264 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv; 1265 struct iwl_rxon_context *ctx = sta_priv->ctx; 1266 1267 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported) 1268 return -1; 1269 1270 if (sta->smps_mode == IEEE80211_SMPS_STATIC) 1271 return -1; 1272 1273 /* Need both Tx chains/antennas to support MIMO */ 1274 if (priv->hw_params.tx_chains_num < 2) 1275 return -1; 1276 1277 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n"); 1278 1279 tbl->lq_type = LQ_MIMO2; 1280 tbl->is_dup = lq_sta->is_dup; 1281 tbl->action = 0; 1282 tbl->max_search = IWL_MAX_SEARCH; 1283 rate_mask = lq_sta->active_mimo2_rate; 1284 1285 if (iwl_is_ht40_tx_allowed(priv, ctx, sta)) 1286 tbl->is_ht40 = 1; 1287 else 1288 tbl->is_ht40 = 0; 1289 1290 rs_set_expected_tpt_table(lq_sta, tbl); 1291 1292 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index); 1293 1294 IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask); 1295 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) { 1296 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n", 1297 rate, rate_mask); 1298 return -1; 1299 } 1300 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green); 1301 1302 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n", 1303 tbl->current_rate, is_green); 1304 return 0; 1305 } 1306 1307 /* 1308 * Set up search table for MIMO3 1309 */ 1310 static int rs_switch_to_mimo3(struct iwl_priv *priv, 1311 struct iwl_lq_sta *lq_sta, 1312 struct ieee80211_conf *conf, 1313 struct ieee80211_sta *sta, 1314 struct iwl_scale_tbl_info *tbl, int index) 1315 { 1316 u16 rate_mask; 1317 s32 rate; 1318 s8 is_green = lq_sta->is_green; 1319 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv; 1320 struct iwl_rxon_context *ctx = sta_priv->ctx; 1321 1322 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported) 1323 return -1; 1324 1325 if (sta->smps_mode == IEEE80211_SMPS_STATIC) 1326 return -1; 1327 1328 /* Need both Tx chains/antennas to support MIMO */ 1329 if (priv->hw_params.tx_chains_num < 3) 1330 return -1; 1331 1332 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n"); 1333 1334 tbl->lq_type = LQ_MIMO3; 1335 tbl->is_dup = lq_sta->is_dup; 1336 tbl->action = 0; 1337 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH; 1338 rate_mask = lq_sta->active_mimo3_rate; 1339 1340 if (iwl_is_ht40_tx_allowed(priv, ctx, sta)) 1341 tbl->is_ht40 = 1; 1342 else 1343 tbl->is_ht40 = 0; 1344 1345 rs_set_expected_tpt_table(lq_sta, tbl); 1346 1347 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index); 1348 1349 IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n", 1350 rate, rate_mask); 1351 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) { 1352 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n", 1353 rate, rate_mask); 1354 return -1; 1355 } 1356 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green); 1357 1358 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n", 1359 tbl->current_rate, is_green); 1360 return 0; 1361 } 1362 1363 /* 1364 * Set up search table for SISO 1365 */ 1366 static int rs_switch_to_siso(struct iwl_priv *priv, 1367 struct iwl_lq_sta *lq_sta, 1368 struct ieee80211_conf *conf, 1369 struct ieee80211_sta *sta, 1370 struct iwl_scale_tbl_info *tbl, int index) 1371 { 1372 u16 rate_mask; 1373 u8 is_green = lq_sta->is_green; 1374 s32 rate; 1375 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv; 1376 struct iwl_rxon_context *ctx = sta_priv->ctx; 1377 1378 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported) 1379 return -1; 1380 1381 IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n"); 1382 1383 tbl->is_dup = lq_sta->is_dup; 1384 tbl->lq_type = LQ_SISO; 1385 tbl->action = 0; 1386 tbl->max_search = IWL_MAX_SEARCH; 1387 rate_mask = lq_sta->active_siso_rate; 1388 1389 if (iwl_is_ht40_tx_allowed(priv, ctx, sta)) 1390 tbl->is_ht40 = 1; 1391 else 1392 tbl->is_ht40 = 0; 1393 1394 if (is_green) 1395 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/ 1396 1397 rs_set_expected_tpt_table(lq_sta, tbl); 1398 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index); 1399 1400 IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask); 1401 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) { 1402 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n", 1403 rate, rate_mask); 1404 return -1; 1405 } 1406 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green); 1407 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n", 1408 tbl->current_rate, is_green); 1409 return 0; 1410 } 1411 1412 /* 1413 * Try to switch to new modulation mode from legacy 1414 */ 1415 static void rs_move_legacy_other(struct iwl_priv *priv, 1416 struct iwl_lq_sta *lq_sta, 1417 struct ieee80211_conf *conf, 1418 struct ieee80211_sta *sta, 1419 int index) 1420 { 1421 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1422 struct iwl_scale_tbl_info *search_tbl = 1423 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 1424 struct iwl_rate_scale_data *window = &(tbl->win[index]); 1425 u32 sz = (sizeof(struct iwl_scale_tbl_info) - 1426 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); 1427 u8 start_action; 1428 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant; 1429 u8 tx_chains_num = priv->hw_params.tx_chains_num; 1430 int ret = 0; 1431 u8 update_search_tbl_counter = 0; 1432 1433 switch (priv->bt_traffic_load) { 1434 case IWL_BT_COEX_TRAFFIC_LOAD_NONE: 1435 /* nothing */ 1436 break; 1437 case IWL_BT_COEX_TRAFFIC_LOAD_LOW: 1438 /* avoid antenna B unless MIMO */ 1439 if (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2) 1440 tbl->action = IWL_LEGACY_SWITCH_SISO; 1441 break; 1442 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH: 1443 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS: 1444 /* avoid antenna B and MIMO */ 1445 valid_tx_ant = 1446 first_antenna(priv->nvm_data->valid_tx_ant); 1447 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2 && 1448 tbl->action != IWL_LEGACY_SWITCH_SISO) 1449 tbl->action = IWL_LEGACY_SWITCH_SISO; 1450 break; 1451 default: 1452 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load); 1453 break; 1454 } 1455 1456 if (!iwl_ht_enabled(priv)) 1457 /* stay in Legacy */ 1458 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1; 1459 else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE && 1460 tbl->action > IWL_LEGACY_SWITCH_SISO) 1461 tbl->action = IWL_LEGACY_SWITCH_SISO; 1462 1463 /* configure as 1x1 if bt full concurrency */ 1464 if (priv->bt_full_concurrent) { 1465 if (!iwl_ht_enabled(priv)) 1466 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1; 1467 else if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2) 1468 tbl->action = IWL_LEGACY_SWITCH_SISO; 1469 valid_tx_ant = 1470 first_antenna(priv->nvm_data->valid_tx_ant); 1471 } 1472 1473 start_action = tbl->action; 1474 for (; ;) { 1475 lq_sta->action_counter++; 1476 switch (tbl->action) { 1477 case IWL_LEGACY_SWITCH_ANTENNA1: 1478 case IWL_LEGACY_SWITCH_ANTENNA2: 1479 IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n"); 1480 1481 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 && 1482 tx_chains_num <= 1) || 1483 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 && 1484 tx_chains_num <= 2)) 1485 break; 1486 1487 /* Don't change antenna if success has been great */ 1488 if (window->success_ratio >= IWL_RS_GOOD_RATIO && 1489 !priv->bt_full_concurrent && 1490 priv->bt_traffic_load == 1491 IWL_BT_COEX_TRAFFIC_LOAD_NONE) 1492 break; 1493 1494 /* Set up search table to try other antenna */ 1495 memcpy(search_tbl, tbl, sz); 1496 1497 if (rs_toggle_antenna(valid_tx_ant, 1498 &search_tbl->current_rate, search_tbl)) { 1499 update_search_tbl_counter = 1; 1500 rs_set_expected_tpt_table(lq_sta, search_tbl); 1501 goto out; 1502 } 1503 break; 1504 case IWL_LEGACY_SWITCH_SISO: 1505 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n"); 1506 1507 /* Set up search table to try SISO */ 1508 memcpy(search_tbl, tbl, sz); 1509 search_tbl->is_SGI = 0; 1510 ret = rs_switch_to_siso(priv, lq_sta, conf, sta, 1511 search_tbl, index); 1512 if (!ret) { 1513 lq_sta->action_counter = 0; 1514 goto out; 1515 } 1516 1517 break; 1518 case IWL_LEGACY_SWITCH_MIMO2_AB: 1519 case IWL_LEGACY_SWITCH_MIMO2_AC: 1520 case IWL_LEGACY_SWITCH_MIMO2_BC: 1521 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n"); 1522 1523 /* Set up search table to try MIMO */ 1524 memcpy(search_tbl, tbl, sz); 1525 search_tbl->is_SGI = 0; 1526 1527 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB) 1528 search_tbl->ant_type = ANT_AB; 1529 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC) 1530 search_tbl->ant_type = ANT_AC; 1531 else 1532 search_tbl->ant_type = ANT_BC; 1533 1534 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 1535 break; 1536 1537 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta, 1538 search_tbl, index); 1539 if (!ret) { 1540 lq_sta->action_counter = 0; 1541 goto out; 1542 } 1543 break; 1544 1545 case IWL_LEGACY_SWITCH_MIMO3_ABC: 1546 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n"); 1547 1548 /* Set up search table to try MIMO3 */ 1549 memcpy(search_tbl, tbl, sz); 1550 search_tbl->is_SGI = 0; 1551 1552 search_tbl->ant_type = ANT_ABC; 1553 1554 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 1555 break; 1556 1557 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta, 1558 search_tbl, index); 1559 if (!ret) { 1560 lq_sta->action_counter = 0; 1561 goto out; 1562 } 1563 break; 1564 } 1565 tbl->action++; 1566 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC) 1567 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1; 1568 1569 if (tbl->action == start_action) 1570 break; 1571 1572 } 1573 search_tbl->lq_type = LQ_NONE; 1574 return; 1575 1576 out: 1577 lq_sta->search_better_tbl = 1; 1578 tbl->action++; 1579 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC) 1580 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1; 1581 if (update_search_tbl_counter) 1582 search_tbl->action = tbl->action; 1583 } 1584 1585 /* 1586 * Try to switch to new modulation mode from SISO 1587 */ 1588 static void rs_move_siso_to_other(struct iwl_priv *priv, 1589 struct iwl_lq_sta *lq_sta, 1590 struct ieee80211_conf *conf, 1591 struct ieee80211_sta *sta, int index) 1592 { 1593 u8 is_green = lq_sta->is_green; 1594 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1595 struct iwl_scale_tbl_info *search_tbl = 1596 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 1597 struct iwl_rate_scale_data *window = &(tbl->win[index]); 1598 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 1599 u32 sz = (sizeof(struct iwl_scale_tbl_info) - 1600 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); 1601 u8 start_action; 1602 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant; 1603 u8 tx_chains_num = priv->hw_params.tx_chains_num; 1604 u8 update_search_tbl_counter = 0; 1605 int ret; 1606 1607 switch (priv->bt_traffic_load) { 1608 case IWL_BT_COEX_TRAFFIC_LOAD_NONE: 1609 /* nothing */ 1610 break; 1611 case IWL_BT_COEX_TRAFFIC_LOAD_LOW: 1612 /* avoid antenna B unless MIMO */ 1613 if (tbl->action == IWL_SISO_SWITCH_ANTENNA2) 1614 tbl->action = IWL_SISO_SWITCH_MIMO2_AB; 1615 break; 1616 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH: 1617 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS: 1618 /* avoid antenna B and MIMO */ 1619 valid_tx_ant = 1620 first_antenna(priv->nvm_data->valid_tx_ant); 1621 if (tbl->action != IWL_SISO_SWITCH_ANTENNA1) 1622 tbl->action = IWL_SISO_SWITCH_ANTENNA1; 1623 break; 1624 default: 1625 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load); 1626 break; 1627 } 1628 1629 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE && 1630 tbl->action > IWL_SISO_SWITCH_ANTENNA2) { 1631 /* stay in SISO */ 1632 tbl->action = IWL_SISO_SWITCH_ANTENNA1; 1633 } 1634 1635 /* configure as 1x1 if bt full concurrency */ 1636 if (priv->bt_full_concurrent) { 1637 valid_tx_ant = 1638 first_antenna(priv->nvm_data->valid_tx_ant); 1639 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2) 1640 tbl->action = IWL_SISO_SWITCH_ANTENNA1; 1641 } 1642 1643 start_action = tbl->action; 1644 for (;;) { 1645 lq_sta->action_counter++; 1646 switch (tbl->action) { 1647 case IWL_SISO_SWITCH_ANTENNA1: 1648 case IWL_SISO_SWITCH_ANTENNA2: 1649 IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n"); 1650 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 && 1651 tx_chains_num <= 1) || 1652 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 && 1653 tx_chains_num <= 2)) 1654 break; 1655 1656 if (window->success_ratio >= IWL_RS_GOOD_RATIO && 1657 !priv->bt_full_concurrent && 1658 priv->bt_traffic_load == 1659 IWL_BT_COEX_TRAFFIC_LOAD_NONE) 1660 break; 1661 1662 memcpy(search_tbl, tbl, sz); 1663 if (rs_toggle_antenna(valid_tx_ant, 1664 &search_tbl->current_rate, search_tbl)) { 1665 update_search_tbl_counter = 1; 1666 goto out; 1667 } 1668 break; 1669 case IWL_SISO_SWITCH_MIMO2_AB: 1670 case IWL_SISO_SWITCH_MIMO2_AC: 1671 case IWL_SISO_SWITCH_MIMO2_BC: 1672 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n"); 1673 memcpy(search_tbl, tbl, sz); 1674 search_tbl->is_SGI = 0; 1675 1676 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB) 1677 search_tbl->ant_type = ANT_AB; 1678 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC) 1679 search_tbl->ant_type = ANT_AC; 1680 else 1681 search_tbl->ant_type = ANT_BC; 1682 1683 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 1684 break; 1685 1686 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta, 1687 search_tbl, index); 1688 if (!ret) 1689 goto out; 1690 break; 1691 case IWL_SISO_SWITCH_GI: 1692 if (!tbl->is_ht40 && !(ht_cap->cap & 1693 IEEE80211_HT_CAP_SGI_20)) 1694 break; 1695 if (tbl->is_ht40 && !(ht_cap->cap & 1696 IEEE80211_HT_CAP_SGI_40)) 1697 break; 1698 1699 IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n"); 1700 1701 memcpy(search_tbl, tbl, sz); 1702 if (is_green) { 1703 if (!tbl->is_SGI) 1704 break; 1705 else 1706 IWL_ERR(priv, 1707 "SGI was set in GF+SISO\n"); 1708 } 1709 search_tbl->is_SGI = !tbl->is_SGI; 1710 rs_set_expected_tpt_table(lq_sta, search_tbl); 1711 if (tbl->is_SGI) { 1712 s32 tpt = lq_sta->last_tpt / 100; 1713 if (tpt >= search_tbl->expected_tpt[index]) 1714 break; 1715 } 1716 search_tbl->current_rate = 1717 rate_n_flags_from_tbl(priv, search_tbl, 1718 index, is_green); 1719 update_search_tbl_counter = 1; 1720 goto out; 1721 case IWL_SISO_SWITCH_MIMO3_ABC: 1722 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n"); 1723 memcpy(search_tbl, tbl, sz); 1724 search_tbl->is_SGI = 0; 1725 search_tbl->ant_type = ANT_ABC; 1726 1727 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 1728 break; 1729 1730 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta, 1731 search_tbl, index); 1732 if (!ret) 1733 goto out; 1734 break; 1735 } 1736 tbl->action++; 1737 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC) 1738 tbl->action = IWL_SISO_SWITCH_ANTENNA1; 1739 1740 if (tbl->action == start_action) 1741 break; 1742 } 1743 search_tbl->lq_type = LQ_NONE; 1744 return; 1745 1746 out: 1747 lq_sta->search_better_tbl = 1; 1748 tbl->action++; 1749 if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC) 1750 tbl->action = IWL_SISO_SWITCH_ANTENNA1; 1751 if (update_search_tbl_counter) 1752 search_tbl->action = tbl->action; 1753 } 1754 1755 /* 1756 * Try to switch to new modulation mode from MIMO2 1757 */ 1758 static void rs_move_mimo2_to_other(struct iwl_priv *priv, 1759 struct iwl_lq_sta *lq_sta, 1760 struct ieee80211_conf *conf, 1761 struct ieee80211_sta *sta, int index) 1762 { 1763 s8 is_green = lq_sta->is_green; 1764 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1765 struct iwl_scale_tbl_info *search_tbl = 1766 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 1767 struct iwl_rate_scale_data *window = &(tbl->win[index]); 1768 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 1769 u32 sz = (sizeof(struct iwl_scale_tbl_info) - 1770 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); 1771 u8 start_action; 1772 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant; 1773 u8 tx_chains_num = priv->hw_params.tx_chains_num; 1774 u8 update_search_tbl_counter = 0; 1775 int ret; 1776 1777 switch (priv->bt_traffic_load) { 1778 case IWL_BT_COEX_TRAFFIC_LOAD_NONE: 1779 /* nothing */ 1780 break; 1781 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH: 1782 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS: 1783 /* avoid antenna B and MIMO */ 1784 if (tbl->action != IWL_MIMO2_SWITCH_SISO_A) 1785 tbl->action = IWL_MIMO2_SWITCH_SISO_A; 1786 break; 1787 case IWL_BT_COEX_TRAFFIC_LOAD_LOW: 1788 /* avoid antenna B unless MIMO */ 1789 if (tbl->action == IWL_MIMO2_SWITCH_SISO_B || 1790 tbl->action == IWL_MIMO2_SWITCH_SISO_C) 1791 tbl->action = IWL_MIMO2_SWITCH_SISO_A; 1792 break; 1793 default: 1794 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load); 1795 break; 1796 } 1797 1798 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) && 1799 (tbl->action < IWL_MIMO2_SWITCH_SISO_A || 1800 tbl->action > IWL_MIMO2_SWITCH_SISO_C)) { 1801 /* switch in SISO */ 1802 tbl->action = IWL_MIMO2_SWITCH_SISO_A; 1803 } 1804 1805 /* configure as 1x1 if bt full concurrency */ 1806 if (priv->bt_full_concurrent && 1807 (tbl->action < IWL_MIMO2_SWITCH_SISO_A || 1808 tbl->action > IWL_MIMO2_SWITCH_SISO_C)) 1809 tbl->action = IWL_MIMO2_SWITCH_SISO_A; 1810 1811 start_action = tbl->action; 1812 for (;;) { 1813 lq_sta->action_counter++; 1814 switch (tbl->action) { 1815 case IWL_MIMO2_SWITCH_ANTENNA1: 1816 case IWL_MIMO2_SWITCH_ANTENNA2: 1817 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n"); 1818 1819 if (tx_chains_num <= 2) 1820 break; 1821 1822 if (window->success_ratio >= IWL_RS_GOOD_RATIO) 1823 break; 1824 1825 memcpy(search_tbl, tbl, sz); 1826 if (rs_toggle_antenna(valid_tx_ant, 1827 &search_tbl->current_rate, search_tbl)) { 1828 update_search_tbl_counter = 1; 1829 goto out; 1830 } 1831 break; 1832 case IWL_MIMO2_SWITCH_SISO_A: 1833 case IWL_MIMO2_SWITCH_SISO_B: 1834 case IWL_MIMO2_SWITCH_SISO_C: 1835 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n"); 1836 1837 /* Set up new search table for SISO */ 1838 memcpy(search_tbl, tbl, sz); 1839 1840 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A) 1841 search_tbl->ant_type = ANT_A; 1842 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B) 1843 search_tbl->ant_type = ANT_B; 1844 else 1845 search_tbl->ant_type = ANT_C; 1846 1847 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 1848 break; 1849 1850 ret = rs_switch_to_siso(priv, lq_sta, conf, sta, 1851 search_tbl, index); 1852 if (!ret) 1853 goto out; 1854 1855 break; 1856 1857 case IWL_MIMO2_SWITCH_GI: 1858 if (!tbl->is_ht40 && !(ht_cap->cap & 1859 IEEE80211_HT_CAP_SGI_20)) 1860 break; 1861 if (tbl->is_ht40 && !(ht_cap->cap & 1862 IEEE80211_HT_CAP_SGI_40)) 1863 break; 1864 1865 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n"); 1866 1867 /* Set up new search table for MIMO2 */ 1868 memcpy(search_tbl, tbl, sz); 1869 search_tbl->is_SGI = !tbl->is_SGI; 1870 rs_set_expected_tpt_table(lq_sta, search_tbl); 1871 /* 1872 * If active table already uses the fastest possible 1873 * modulation (dual stream with short guard interval), 1874 * and it's working well, there's no need to look 1875 * for a better type of modulation! 1876 */ 1877 if (tbl->is_SGI) { 1878 s32 tpt = lq_sta->last_tpt / 100; 1879 if (tpt >= search_tbl->expected_tpt[index]) 1880 break; 1881 } 1882 search_tbl->current_rate = 1883 rate_n_flags_from_tbl(priv, search_tbl, 1884 index, is_green); 1885 update_search_tbl_counter = 1; 1886 goto out; 1887 1888 case IWL_MIMO2_SWITCH_MIMO3_ABC: 1889 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n"); 1890 memcpy(search_tbl, tbl, sz); 1891 search_tbl->is_SGI = 0; 1892 search_tbl->ant_type = ANT_ABC; 1893 1894 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 1895 break; 1896 1897 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta, 1898 search_tbl, index); 1899 if (!ret) 1900 goto out; 1901 1902 break; 1903 } 1904 tbl->action++; 1905 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC) 1906 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1; 1907 1908 if (tbl->action == start_action) 1909 break; 1910 } 1911 search_tbl->lq_type = LQ_NONE; 1912 return; 1913 out: 1914 lq_sta->search_better_tbl = 1; 1915 tbl->action++; 1916 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC) 1917 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1; 1918 if (update_search_tbl_counter) 1919 search_tbl->action = tbl->action; 1920 1921 } 1922 1923 /* 1924 * Try to switch to new modulation mode from MIMO3 1925 */ 1926 static void rs_move_mimo3_to_other(struct iwl_priv *priv, 1927 struct iwl_lq_sta *lq_sta, 1928 struct ieee80211_conf *conf, 1929 struct ieee80211_sta *sta, int index) 1930 { 1931 s8 is_green = lq_sta->is_green; 1932 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1933 struct iwl_scale_tbl_info *search_tbl = 1934 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 1935 struct iwl_rate_scale_data *window = &(tbl->win[index]); 1936 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 1937 u32 sz = (sizeof(struct iwl_scale_tbl_info) - 1938 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); 1939 u8 start_action; 1940 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant; 1941 u8 tx_chains_num = priv->hw_params.tx_chains_num; 1942 int ret; 1943 u8 update_search_tbl_counter = 0; 1944 1945 switch (priv->bt_traffic_load) { 1946 case IWL_BT_COEX_TRAFFIC_LOAD_NONE: 1947 /* nothing */ 1948 break; 1949 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH: 1950 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS: 1951 /* avoid antenna B and MIMO */ 1952 if (tbl->action != IWL_MIMO3_SWITCH_SISO_A) 1953 tbl->action = IWL_MIMO3_SWITCH_SISO_A; 1954 break; 1955 case IWL_BT_COEX_TRAFFIC_LOAD_LOW: 1956 /* avoid antenna B unless MIMO */ 1957 if (tbl->action == IWL_MIMO3_SWITCH_SISO_B || 1958 tbl->action == IWL_MIMO3_SWITCH_SISO_C) 1959 tbl->action = IWL_MIMO3_SWITCH_SISO_A; 1960 break; 1961 default: 1962 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load); 1963 break; 1964 } 1965 1966 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) && 1967 (tbl->action < IWL_MIMO3_SWITCH_SISO_A || 1968 tbl->action > IWL_MIMO3_SWITCH_SISO_C)) { 1969 /* switch in SISO */ 1970 tbl->action = IWL_MIMO3_SWITCH_SISO_A; 1971 } 1972 1973 /* configure as 1x1 if bt full concurrency */ 1974 if (priv->bt_full_concurrent && 1975 (tbl->action < IWL_MIMO3_SWITCH_SISO_A || 1976 tbl->action > IWL_MIMO3_SWITCH_SISO_C)) 1977 tbl->action = IWL_MIMO3_SWITCH_SISO_A; 1978 1979 start_action = tbl->action; 1980 for (;;) { 1981 lq_sta->action_counter++; 1982 switch (tbl->action) { 1983 case IWL_MIMO3_SWITCH_ANTENNA1: 1984 case IWL_MIMO3_SWITCH_ANTENNA2: 1985 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n"); 1986 1987 if (tx_chains_num <= 3) 1988 break; 1989 1990 if (window->success_ratio >= IWL_RS_GOOD_RATIO) 1991 break; 1992 1993 memcpy(search_tbl, tbl, sz); 1994 if (rs_toggle_antenna(valid_tx_ant, 1995 &search_tbl->current_rate, search_tbl)) 1996 goto out; 1997 break; 1998 case IWL_MIMO3_SWITCH_SISO_A: 1999 case IWL_MIMO3_SWITCH_SISO_B: 2000 case IWL_MIMO3_SWITCH_SISO_C: 2001 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n"); 2002 2003 /* Set up new search table for SISO */ 2004 memcpy(search_tbl, tbl, sz); 2005 2006 if (tbl->action == IWL_MIMO3_SWITCH_SISO_A) 2007 search_tbl->ant_type = ANT_A; 2008 else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B) 2009 search_tbl->ant_type = ANT_B; 2010 else 2011 search_tbl->ant_type = ANT_C; 2012 2013 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 2014 break; 2015 2016 ret = rs_switch_to_siso(priv, lq_sta, conf, sta, 2017 search_tbl, index); 2018 if (!ret) 2019 goto out; 2020 2021 break; 2022 2023 case IWL_MIMO3_SWITCH_MIMO2_AB: 2024 case IWL_MIMO3_SWITCH_MIMO2_AC: 2025 case IWL_MIMO3_SWITCH_MIMO2_BC: 2026 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n"); 2027 2028 memcpy(search_tbl, tbl, sz); 2029 search_tbl->is_SGI = 0; 2030 if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB) 2031 search_tbl->ant_type = ANT_AB; 2032 else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC) 2033 search_tbl->ant_type = ANT_AC; 2034 else 2035 search_tbl->ant_type = ANT_BC; 2036 2037 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 2038 break; 2039 2040 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta, 2041 search_tbl, index); 2042 if (!ret) 2043 goto out; 2044 2045 break; 2046 2047 case IWL_MIMO3_SWITCH_GI: 2048 if (!tbl->is_ht40 && !(ht_cap->cap & 2049 IEEE80211_HT_CAP_SGI_20)) 2050 break; 2051 if (tbl->is_ht40 && !(ht_cap->cap & 2052 IEEE80211_HT_CAP_SGI_40)) 2053 break; 2054 2055 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n"); 2056 2057 /* Set up new search table for MIMO */ 2058 memcpy(search_tbl, tbl, sz); 2059 search_tbl->is_SGI = !tbl->is_SGI; 2060 rs_set_expected_tpt_table(lq_sta, search_tbl); 2061 /* 2062 * If active table already uses the fastest possible 2063 * modulation (dual stream with short guard interval), 2064 * and it's working well, there's no need to look 2065 * for a better type of modulation! 2066 */ 2067 if (tbl->is_SGI) { 2068 s32 tpt = lq_sta->last_tpt / 100; 2069 if (tpt >= search_tbl->expected_tpt[index]) 2070 break; 2071 } 2072 search_tbl->current_rate = 2073 rate_n_flags_from_tbl(priv, search_tbl, 2074 index, is_green); 2075 update_search_tbl_counter = 1; 2076 goto out; 2077 } 2078 tbl->action++; 2079 if (tbl->action > IWL_MIMO3_SWITCH_GI) 2080 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1; 2081 2082 if (tbl->action == start_action) 2083 break; 2084 } 2085 search_tbl->lq_type = LQ_NONE; 2086 return; 2087 out: 2088 lq_sta->search_better_tbl = 1; 2089 tbl->action++; 2090 if (tbl->action > IWL_MIMO3_SWITCH_GI) 2091 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1; 2092 if (update_search_tbl_counter) 2093 search_tbl->action = tbl->action; 2094 } 2095 2096 /* 2097 * Check whether we should continue using same modulation mode, or 2098 * begin search for a new mode, based on: 2099 * 1) # tx successes or failures while using this mode 2100 * 2) # times calling this function 2101 * 3) elapsed time in this mode (not used, for now) 2102 */ 2103 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search) 2104 { 2105 struct iwl_scale_tbl_info *tbl; 2106 int i; 2107 int active_tbl; 2108 int flush_interval_passed = 0; 2109 struct iwl_priv *priv; 2110 2111 priv = lq_sta->drv; 2112 active_tbl = lq_sta->active_tbl; 2113 2114 tbl = &(lq_sta->lq_info[active_tbl]); 2115 2116 /* If we've been disallowing search, see if we should now allow it */ 2117 if (lq_sta->stay_in_tbl) { 2118 2119 /* Elapsed time using current modulation mode */ 2120 if (lq_sta->flush_timer) 2121 flush_interval_passed = 2122 time_after(jiffies, 2123 (unsigned long)(lq_sta->flush_timer + 2124 IWL_RATE_SCALE_FLUSH_INTVL)); 2125 2126 /* 2127 * Check if we should allow search for new modulation mode. 2128 * If many frames have failed or succeeded, or we've used 2129 * this same modulation for a long time, allow search, and 2130 * reset history stats that keep track of whether we should 2131 * allow a new search. Also (below) reset all bitmaps and 2132 * stats in active history. 2133 */ 2134 if (force_search || 2135 (lq_sta->total_failed > lq_sta->max_failure_limit) || 2136 (lq_sta->total_success > lq_sta->max_success_limit) || 2137 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer) 2138 && (flush_interval_passed))) { 2139 IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n", 2140 lq_sta->total_failed, 2141 lq_sta->total_success, 2142 flush_interval_passed); 2143 2144 /* Allow search for new mode */ 2145 lq_sta->stay_in_tbl = 0; /* only place reset */ 2146 lq_sta->total_failed = 0; 2147 lq_sta->total_success = 0; 2148 lq_sta->flush_timer = 0; 2149 2150 /* 2151 * Else if we've used this modulation mode enough repetitions 2152 * (regardless of elapsed time or success/failure), reset 2153 * history bitmaps and rate-specific stats for all rates in 2154 * active table. 2155 */ 2156 } else { 2157 lq_sta->table_count++; 2158 if (lq_sta->table_count >= 2159 lq_sta->table_count_limit) { 2160 lq_sta->table_count = 0; 2161 2162 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n"); 2163 for (i = 0; i < IWL_RATE_COUNT; i++) 2164 rs_rate_scale_clear_window( 2165 &(tbl->win[i])); 2166 } 2167 } 2168 2169 /* If transitioning to allow "search", reset all history 2170 * bitmaps and stats in active table (this will become the new 2171 * "search" table). */ 2172 if (!lq_sta->stay_in_tbl) { 2173 for (i = 0; i < IWL_RATE_COUNT; i++) 2174 rs_rate_scale_clear_window(&(tbl->win[i])); 2175 } 2176 } 2177 } 2178 2179 /* 2180 * setup rate table in uCode 2181 */ 2182 static void rs_update_rate_tbl(struct iwl_priv *priv, 2183 struct iwl_rxon_context *ctx, 2184 struct iwl_lq_sta *lq_sta, 2185 struct iwl_scale_tbl_info *tbl, 2186 int index, u8 is_green) 2187 { 2188 u32 rate; 2189 2190 /* Update uCode's rate table. */ 2191 rate = rate_n_flags_from_tbl(priv, tbl, index, is_green); 2192 rs_fill_link_cmd(priv, lq_sta, rate); 2193 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false); 2194 } 2195 2196 /* 2197 * Do rate scaling and search for new modulation mode. 2198 */ 2199 static void rs_rate_scale_perform(struct iwl_priv *priv, 2200 struct sk_buff *skb, 2201 struct ieee80211_sta *sta, 2202 struct iwl_lq_sta *lq_sta) 2203 { 2204 struct ieee80211_hw *hw = priv->hw; 2205 struct ieee80211_conf *conf = &hw->conf; 2206 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2207 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 2208 int low = IWL_RATE_INVALID; 2209 int high = IWL_RATE_INVALID; 2210 int index; 2211 int i; 2212 struct iwl_rate_scale_data *window = NULL; 2213 int current_tpt = IWL_INVALID_VALUE; 2214 int low_tpt = IWL_INVALID_VALUE; 2215 int high_tpt = IWL_INVALID_VALUE; 2216 u32 fail_count; 2217 s8 scale_action = 0; 2218 u16 rate_mask; 2219 u8 update_lq = 0; 2220 struct iwl_scale_tbl_info *tbl, *tbl1; 2221 u16 rate_scale_index_msk = 0; 2222 u8 is_green = 0; 2223 u8 active_tbl = 0; 2224 u8 done_search = 0; 2225 u16 high_low; 2226 s32 sr; 2227 u8 tid = IWL_MAX_TID_COUNT; 2228 struct iwl_tid_data *tid_data; 2229 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv; 2230 struct iwl_rxon_context *ctx = sta_priv->ctx; 2231 2232 IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n"); 2233 2234 /* Send management frames and NO_ACK data using lowest rate. */ 2235 /* TODO: this could probably be improved.. */ 2236 if (!ieee80211_is_data(hdr->frame_control) || 2237 info->flags & IEEE80211_TX_CTL_NO_ACK) 2238 return; 2239 2240 lq_sta->supp_rates = sta->supp_rates[lq_sta->band]; 2241 2242 tid = rs_tl_add_packet(lq_sta, hdr); 2243 if ((tid != IWL_MAX_TID_COUNT) && 2244 (lq_sta->tx_agg_tid_en & (1 << tid))) { 2245 tid_data = &priv->tid_data[lq_sta->lq.sta_id][tid]; 2246 if (tid_data->agg.state == IWL_AGG_OFF) 2247 lq_sta->is_agg = 0; 2248 else 2249 lq_sta->is_agg = 1; 2250 } else 2251 lq_sta->is_agg = 0; 2252 2253 /* 2254 * Select rate-scale / modulation-mode table to work with in 2255 * the rest of this function: "search" if searching for better 2256 * modulation mode, or "active" if doing rate scaling within a mode. 2257 */ 2258 if (!lq_sta->search_better_tbl) 2259 active_tbl = lq_sta->active_tbl; 2260 else 2261 active_tbl = 1 - lq_sta->active_tbl; 2262 2263 tbl = &(lq_sta->lq_info[active_tbl]); 2264 if (is_legacy(tbl->lq_type)) 2265 lq_sta->is_green = 0; 2266 else 2267 lq_sta->is_green = rs_use_green(sta); 2268 is_green = lq_sta->is_green; 2269 2270 /* current tx rate */ 2271 index = lq_sta->last_txrate_idx; 2272 2273 IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index, 2274 tbl->lq_type); 2275 2276 /* rates available for this association, and for modulation mode */ 2277 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type); 2278 2279 IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask); 2280 2281 /* mask with station rate restriction */ 2282 if (is_legacy(tbl->lq_type)) { 2283 if (lq_sta->band == NL80211_BAND_5GHZ) 2284 /* supp_rates has no CCK bits in A mode */ 2285 rate_scale_index_msk = (u16) (rate_mask & 2286 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE)); 2287 else 2288 rate_scale_index_msk = (u16) (rate_mask & 2289 lq_sta->supp_rates); 2290 2291 } else 2292 rate_scale_index_msk = rate_mask; 2293 2294 if (!rate_scale_index_msk) 2295 rate_scale_index_msk = rate_mask; 2296 2297 if (!((1 << index) & rate_scale_index_msk)) { 2298 IWL_ERR(priv, "Current Rate is not valid\n"); 2299 if (lq_sta->search_better_tbl) { 2300 /* revert to active table if search table is not valid*/ 2301 tbl->lq_type = LQ_NONE; 2302 lq_sta->search_better_tbl = 0; 2303 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 2304 /* get "active" rate info */ 2305 index = iwl_hwrate_to_plcp_idx(tbl->current_rate); 2306 rs_update_rate_tbl(priv, ctx, lq_sta, tbl, 2307 index, is_green); 2308 } 2309 return; 2310 } 2311 2312 /* Get expected throughput table and history window for current rate */ 2313 if (!tbl->expected_tpt) { 2314 IWL_ERR(priv, "tbl->expected_tpt is NULL\n"); 2315 return; 2316 } 2317 2318 /* force user max rate if set by user */ 2319 if ((lq_sta->max_rate_idx != -1) && 2320 (lq_sta->max_rate_idx < index)) { 2321 index = lq_sta->max_rate_idx; 2322 update_lq = 1; 2323 window = &(tbl->win[index]); 2324 goto lq_update; 2325 } 2326 2327 window = &(tbl->win[index]); 2328 2329 /* 2330 * If there is not enough history to calculate actual average 2331 * throughput, keep analyzing results of more tx frames, without 2332 * changing rate or mode (bypass most of the rest of this function). 2333 * Set up new rate table in uCode only if old rate is not supported 2334 * in current association (use new rate found above). 2335 */ 2336 fail_count = window->counter - window->success_counter; 2337 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) && 2338 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) { 2339 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d " 2340 "for index %d\n", 2341 window->success_counter, window->counter, index); 2342 2343 /* Can't calculate this yet; not enough history */ 2344 window->average_tpt = IWL_INVALID_VALUE; 2345 2346 /* Should we stay with this modulation mode, 2347 * or search for a new one? */ 2348 rs_stay_in_table(lq_sta, false); 2349 2350 goto out; 2351 } 2352 /* Else we have enough samples; calculate estimate of 2353 * actual average throughput */ 2354 if (window->average_tpt != ((window->success_ratio * 2355 tbl->expected_tpt[index] + 64) / 128)) { 2356 IWL_ERR(priv, "expected_tpt should have been calculated by now\n"); 2357 window->average_tpt = ((window->success_ratio * 2358 tbl->expected_tpt[index] + 64) / 128); 2359 } 2360 2361 /* If we are searching for better modulation mode, check success. */ 2362 if (lq_sta->search_better_tbl && 2363 (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) { 2364 /* If good success, continue using the "search" mode; 2365 * no need to send new link quality command, since we're 2366 * continuing to use the setup that we've been trying. */ 2367 if (window->average_tpt > lq_sta->last_tpt) { 2368 2369 IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE " 2370 "suc=%d cur-tpt=%d old-tpt=%d\n", 2371 window->success_ratio, 2372 window->average_tpt, 2373 lq_sta->last_tpt); 2374 2375 if (!is_legacy(tbl->lq_type)) 2376 lq_sta->enable_counter = 1; 2377 2378 /* Swap tables; "search" becomes "active" */ 2379 lq_sta->active_tbl = active_tbl; 2380 current_tpt = window->average_tpt; 2381 2382 /* Else poor success; go back to mode in "active" table */ 2383 } else { 2384 2385 IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE " 2386 "suc=%d cur-tpt=%d old-tpt=%d\n", 2387 window->success_ratio, 2388 window->average_tpt, 2389 lq_sta->last_tpt); 2390 2391 /* Nullify "search" table */ 2392 tbl->lq_type = LQ_NONE; 2393 2394 /* Revert to "active" table */ 2395 active_tbl = lq_sta->active_tbl; 2396 tbl = &(lq_sta->lq_info[active_tbl]); 2397 2398 /* Revert to "active" rate and throughput info */ 2399 index = iwl_hwrate_to_plcp_idx(tbl->current_rate); 2400 current_tpt = lq_sta->last_tpt; 2401 2402 /* Need to set up a new rate table in uCode */ 2403 update_lq = 1; 2404 } 2405 2406 /* Either way, we've made a decision; modulation mode 2407 * search is done, allow rate adjustment next time. */ 2408 lq_sta->search_better_tbl = 0; 2409 done_search = 1; /* Don't switch modes below! */ 2410 goto lq_update; 2411 } 2412 2413 /* (Else) not in search of better modulation mode, try for better 2414 * starting rate, while staying in this mode. */ 2415 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk, 2416 tbl->lq_type); 2417 low = high_low & 0xff; 2418 high = (high_low >> 8) & 0xff; 2419 2420 /* If user set max rate, dont allow higher than user constrain */ 2421 if ((lq_sta->max_rate_idx != -1) && 2422 (lq_sta->max_rate_idx < high)) 2423 high = IWL_RATE_INVALID; 2424 2425 sr = window->success_ratio; 2426 2427 /* Collect measured throughputs for current and adjacent rates */ 2428 current_tpt = window->average_tpt; 2429 if (low != IWL_RATE_INVALID) 2430 low_tpt = tbl->win[low].average_tpt; 2431 if (high != IWL_RATE_INVALID) 2432 high_tpt = tbl->win[high].average_tpt; 2433 2434 scale_action = 0; 2435 2436 /* Too many failures, decrease rate */ 2437 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) { 2438 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n"); 2439 scale_action = -1; 2440 2441 /* No throughput measured yet for adjacent rates; try increase. */ 2442 } else if ((low_tpt == IWL_INVALID_VALUE) && 2443 (high_tpt == IWL_INVALID_VALUE)) { 2444 2445 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH) 2446 scale_action = 1; 2447 else if (low != IWL_RATE_INVALID) 2448 scale_action = 0; 2449 } 2450 2451 /* Both adjacent throughputs are measured, but neither one has better 2452 * throughput; we're using the best rate, don't change it! */ 2453 else if ((low_tpt != IWL_INVALID_VALUE) && 2454 (high_tpt != IWL_INVALID_VALUE) && 2455 (low_tpt < current_tpt) && 2456 (high_tpt < current_tpt)) 2457 scale_action = 0; 2458 2459 /* At least one adjacent rate's throughput is measured, 2460 * and may have better performance. */ 2461 else { 2462 /* Higher adjacent rate's throughput is measured */ 2463 if (high_tpt != IWL_INVALID_VALUE) { 2464 /* Higher rate has better throughput */ 2465 if (high_tpt > current_tpt && 2466 sr >= IWL_RATE_INCREASE_TH) { 2467 scale_action = 1; 2468 } else { 2469 scale_action = 0; 2470 } 2471 2472 /* Lower adjacent rate's throughput is measured */ 2473 } else if (low_tpt != IWL_INVALID_VALUE) { 2474 /* Lower rate has better throughput */ 2475 if (low_tpt > current_tpt) { 2476 IWL_DEBUG_RATE(priv, 2477 "decrease rate because of low tpt\n"); 2478 scale_action = -1; 2479 } else if (sr >= IWL_RATE_INCREASE_TH) { 2480 scale_action = 1; 2481 } 2482 } 2483 } 2484 2485 /* Sanity check; asked for decrease, but success rate or throughput 2486 * has been good at old rate. Don't change it. */ 2487 if ((scale_action == -1) && (low != IWL_RATE_INVALID) && 2488 ((sr > IWL_RATE_HIGH_TH) || 2489 (current_tpt > (100 * tbl->expected_tpt[low])))) 2490 scale_action = 0; 2491 if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type)) 2492 scale_action = -1; 2493 if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI && 2494 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) 2495 scale_action = -1; 2496 2497 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) && 2498 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) { 2499 if (lq_sta->last_bt_traffic > priv->bt_traffic_load) { 2500 /* 2501 * don't set scale_action, don't want to scale up if 2502 * the rate scale doesn't otherwise think that is a 2503 * good idea. 2504 */ 2505 } else if (lq_sta->last_bt_traffic <= priv->bt_traffic_load) { 2506 scale_action = -1; 2507 } 2508 } 2509 lq_sta->last_bt_traffic = priv->bt_traffic_load; 2510 2511 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) && 2512 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) { 2513 /* search for a new modulation */ 2514 rs_stay_in_table(lq_sta, true); 2515 goto lq_update; 2516 } 2517 2518 switch (scale_action) { 2519 case -1: 2520 /* Decrease starting rate, update uCode's rate table */ 2521 if (low != IWL_RATE_INVALID) { 2522 update_lq = 1; 2523 index = low; 2524 } 2525 2526 break; 2527 case 1: 2528 /* Increase starting rate, update uCode's rate table */ 2529 if (high != IWL_RATE_INVALID) { 2530 update_lq = 1; 2531 index = high; 2532 } 2533 2534 break; 2535 case 0: 2536 /* No change */ 2537 default: 2538 break; 2539 } 2540 2541 IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d " 2542 "high %d type %d\n", 2543 index, scale_action, low, high, tbl->lq_type); 2544 2545 lq_update: 2546 /* Replace uCode's rate table for the destination station. */ 2547 if (update_lq) 2548 rs_update_rate_tbl(priv, ctx, lq_sta, tbl, index, is_green); 2549 2550 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) { 2551 /* Should we stay with this modulation mode, 2552 * or search for a new one? */ 2553 rs_stay_in_table(lq_sta, false); 2554 } 2555 /* 2556 * Search for new modulation mode if we're: 2557 * 1) Not changing rates right now 2558 * 2) Not just finishing up a search 2559 * 3) Allowing a new search 2560 */ 2561 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) { 2562 /* Save current throughput to compare with "search" throughput*/ 2563 lq_sta->last_tpt = current_tpt; 2564 2565 /* Select a new "search" modulation mode to try. 2566 * If one is found, set up the new "search" table. */ 2567 if (is_legacy(tbl->lq_type)) 2568 rs_move_legacy_other(priv, lq_sta, conf, sta, index); 2569 else if (is_siso(tbl->lq_type)) 2570 rs_move_siso_to_other(priv, lq_sta, conf, sta, index); 2571 else if (is_mimo2(tbl->lq_type)) 2572 rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index); 2573 else 2574 rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index); 2575 2576 /* If new "search" mode was selected, set up in uCode table */ 2577 if (lq_sta->search_better_tbl) { 2578 /* Access the "search" table, clear its history. */ 2579 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 2580 for (i = 0; i < IWL_RATE_COUNT; i++) 2581 rs_rate_scale_clear_window(&(tbl->win[i])); 2582 2583 /* Use new "search" start rate */ 2584 index = iwl_hwrate_to_plcp_idx(tbl->current_rate); 2585 2586 IWL_DEBUG_RATE(priv, "Switch current mcs: %X index: %d\n", 2587 tbl->current_rate, index); 2588 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate); 2589 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false); 2590 } else 2591 done_search = 1; 2592 } 2593 2594 if (done_search && !lq_sta->stay_in_tbl) { 2595 /* If the "active" (non-search) mode was legacy, 2596 * and we've tried switching antennas, 2597 * but we haven't been able to try HT modes (not available), 2598 * stay with best antenna legacy modulation for a while 2599 * before next round of mode comparisons. */ 2600 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]); 2601 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) && 2602 lq_sta->action_counter > tbl1->max_search) { 2603 IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n"); 2604 rs_set_stay_in_table(priv, 1, lq_sta); 2605 } 2606 2607 /* If we're in an HT mode, and all 3 mode switch actions 2608 * have been tried and compared, stay in this best modulation 2609 * mode for a while before next round of mode comparisons. */ 2610 if (lq_sta->enable_counter && 2611 (lq_sta->action_counter >= tbl1->max_search) && 2612 iwl_ht_enabled(priv)) { 2613 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) && 2614 (lq_sta->tx_agg_tid_en & (1 << tid)) && 2615 (tid != IWL_MAX_TID_COUNT)) { 2616 u8 sta_id = lq_sta->lq.sta_id; 2617 tid_data = &priv->tid_data[sta_id][tid]; 2618 if (tid_data->agg.state == IWL_AGG_OFF) { 2619 IWL_DEBUG_RATE(priv, 2620 "try to aggregate tid %d\n", 2621 tid); 2622 rs_tl_turn_on_agg(priv, tid, 2623 lq_sta, sta); 2624 } 2625 } 2626 rs_set_stay_in_table(priv, 0, lq_sta); 2627 } 2628 } 2629 2630 out: 2631 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green); 2632 lq_sta->last_txrate_idx = index; 2633 } 2634 2635 /** 2636 * rs_initialize_lq - Initialize a station's hardware rate table 2637 * 2638 * The uCode's station table contains a table of fallback rates 2639 * for automatic fallback during transmission. 2640 * 2641 * NOTE: This sets up a default set of values. These will be replaced later 2642 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of 2643 * rc80211_simple. 2644 * 2645 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before 2646 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD, 2647 * which requires station table entry to exist). 2648 */ 2649 static void rs_initialize_lq(struct iwl_priv *priv, 2650 struct ieee80211_sta *sta, 2651 struct iwl_lq_sta *lq_sta) 2652 { 2653 struct iwl_scale_tbl_info *tbl; 2654 int rate_idx; 2655 int i; 2656 u32 rate; 2657 u8 use_green = rs_use_green(sta); 2658 u8 active_tbl = 0; 2659 u8 valid_tx_ant; 2660 struct iwl_station_priv *sta_priv; 2661 struct iwl_rxon_context *ctx; 2662 2663 if (!sta || !lq_sta) 2664 return; 2665 2666 sta_priv = (void *)sta->drv_priv; 2667 ctx = sta_priv->ctx; 2668 2669 i = lq_sta->last_txrate_idx; 2670 2671 valid_tx_ant = priv->nvm_data->valid_tx_ant; 2672 2673 if (!lq_sta->search_better_tbl) 2674 active_tbl = lq_sta->active_tbl; 2675 else 2676 active_tbl = 1 - lq_sta->active_tbl; 2677 2678 tbl = &(lq_sta->lq_info[active_tbl]); 2679 2680 if ((i < 0) || (i >= IWL_RATE_COUNT)) 2681 i = 0; 2682 2683 rate = iwl_rates[i].plcp; 2684 tbl->ant_type = first_antenna(valid_tx_ant); 2685 rate |= tbl->ant_type << RATE_MCS_ANT_POS; 2686 2687 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE) 2688 rate |= RATE_MCS_CCK_MSK; 2689 2690 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx); 2691 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type)) 2692 rs_toggle_antenna(valid_tx_ant, &rate, tbl); 2693 2694 rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green); 2695 tbl->current_rate = rate; 2696 rs_set_expected_tpt_table(lq_sta, tbl); 2697 rs_fill_link_cmd(NULL, lq_sta, rate); 2698 priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq; 2699 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, 0, true); 2700 } 2701 2702 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta, 2703 struct ieee80211_tx_rate_control *txrc) 2704 { 2705 2706 struct sk_buff *skb = txrc->skb; 2707 struct ieee80211_supported_band *sband = txrc->sband; 2708 struct iwl_op_mode *op_mode __maybe_unused = 2709 (struct iwl_op_mode *)priv_r; 2710 struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode); 2711 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2712 struct iwl_lq_sta *lq_sta = priv_sta; 2713 int rate_idx; 2714 2715 IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n"); 2716 2717 /* Get max rate if user set max rate */ 2718 if (lq_sta) { 2719 lq_sta->max_rate_idx = fls(txrc->rate_idx_mask) - 1; 2720 if ((sband->band == NL80211_BAND_5GHZ) && 2721 (lq_sta->max_rate_idx != -1)) 2722 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE; 2723 if ((lq_sta->max_rate_idx < 0) || 2724 (lq_sta->max_rate_idx >= IWL_RATE_COUNT)) 2725 lq_sta->max_rate_idx = -1; 2726 } 2727 2728 /* Treat uninitialized rate scaling data same as non-existing. */ 2729 if (lq_sta && !lq_sta->drv) { 2730 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n"); 2731 priv_sta = NULL; 2732 } 2733 2734 /* Send management frames and NO_ACK data using lowest rate. */ 2735 if (rate_control_send_low(sta, priv_sta, txrc)) 2736 return; 2737 2738 rate_idx = lq_sta->last_txrate_idx; 2739 2740 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) { 2741 rate_idx -= IWL_FIRST_OFDM_RATE; 2742 /* 6M and 9M shared same MCS index */ 2743 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0; 2744 if (rs_extract_rate(lq_sta->last_rate_n_flags) >= 2745 IWL_RATE_MIMO3_6M_PLCP) 2746 rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM); 2747 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >= 2748 IWL_RATE_MIMO2_6M_PLCP) 2749 rate_idx = rate_idx + MCS_INDEX_PER_STREAM; 2750 info->control.rates[0].flags = IEEE80211_TX_RC_MCS; 2751 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK) 2752 info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI; 2753 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK) 2754 info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA; 2755 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK) 2756 info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2757 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK) 2758 info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD; 2759 } else { 2760 /* Check for invalid rates */ 2761 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) || 2762 ((sband->band == NL80211_BAND_5GHZ) && 2763 (rate_idx < IWL_FIRST_OFDM_RATE))) 2764 rate_idx = rate_lowest_index(sband, sta); 2765 /* On valid 5 GHz rate, adjust index */ 2766 else if (sband->band == NL80211_BAND_5GHZ) 2767 rate_idx -= IWL_FIRST_OFDM_RATE; 2768 info->control.rates[0].flags = 0; 2769 } 2770 info->control.rates[0].idx = rate_idx; 2771 info->control.rates[0].count = 1; 2772 } 2773 2774 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta, 2775 gfp_t gfp) 2776 { 2777 struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv; 2778 struct iwl_op_mode *op_mode __maybe_unused = 2779 (struct iwl_op_mode *)priv_rate; 2780 struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode); 2781 2782 IWL_DEBUG_RATE(priv, "create station rate scale window\n"); 2783 2784 return &sta_priv->lq_sta; 2785 } 2786 2787 /* 2788 * Called after adding a new station to initialize rate scaling 2789 */ 2790 void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id) 2791 { 2792 int i, j; 2793 struct ieee80211_hw *hw = priv->hw; 2794 struct ieee80211_conf *conf = &priv->hw->conf; 2795 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 2796 struct iwl_station_priv *sta_priv; 2797 struct iwl_lq_sta *lq_sta; 2798 struct ieee80211_supported_band *sband; 2799 unsigned long supp; /* must be unsigned long for for_each_set_bit */ 2800 2801 sta_priv = (struct iwl_station_priv *) sta->drv_priv; 2802 lq_sta = &sta_priv->lq_sta; 2803 sband = hw->wiphy->bands[conf->chandef.chan->band]; 2804 2805 2806 lq_sta->lq.sta_id = sta_id; 2807 2808 for (j = 0; j < LQ_SIZE; j++) 2809 for (i = 0; i < IWL_RATE_COUNT; i++) 2810 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]); 2811 2812 lq_sta->flush_timer = 0; 2813 lq_sta->supp_rates = sta->supp_rates[sband->band]; 2814 2815 IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n", 2816 sta_id); 2817 /* TODO: what is a good starting rate for STA? About middle? Maybe not 2818 * the lowest or the highest rate.. Could consider using RSSI from 2819 * previous packets? Need to have IEEE 802.1X auth succeed immediately 2820 * after assoc.. */ 2821 2822 lq_sta->is_dup = 0; 2823 lq_sta->max_rate_idx = -1; 2824 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX; 2825 lq_sta->is_green = rs_use_green(sta); 2826 lq_sta->band = sband->band; 2827 /* 2828 * active legacy rates as per supported rates bitmap 2829 */ 2830 supp = sta->supp_rates[sband->band]; 2831 lq_sta->active_legacy_rate = 0; 2832 for_each_set_bit(i, &supp, BITS_PER_LONG) 2833 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value); 2834 2835 /* 2836 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3), 2837 * supp_rates[] does not; shift to convert format, force 9 MBits off. 2838 */ 2839 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1; 2840 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1; 2841 lq_sta->active_siso_rate &= ~((u16)0x2); 2842 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE; 2843 2844 /* Same here */ 2845 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1; 2846 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1; 2847 lq_sta->active_mimo2_rate &= ~((u16)0x2); 2848 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE; 2849 2850 lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1; 2851 lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1; 2852 lq_sta->active_mimo3_rate &= ~((u16)0x2); 2853 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE; 2854 2855 IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n", 2856 lq_sta->active_siso_rate, 2857 lq_sta->active_mimo2_rate, 2858 lq_sta->active_mimo3_rate); 2859 2860 /* These values will be overridden later */ 2861 lq_sta->lq.general_params.single_stream_ant_msk = 2862 first_antenna(priv->nvm_data->valid_tx_ant); 2863 lq_sta->lq.general_params.dual_stream_ant_msk = 2864 priv->nvm_data->valid_tx_ant & 2865 ~first_antenna(priv->nvm_data->valid_tx_ant); 2866 if (!lq_sta->lq.general_params.dual_stream_ant_msk) { 2867 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB; 2868 } else if (num_of_ant(priv->nvm_data->valid_tx_ant) == 2) { 2869 lq_sta->lq.general_params.dual_stream_ant_msk = 2870 priv->nvm_data->valid_tx_ant; 2871 } 2872 2873 /* as default allow aggregation for all tids */ 2874 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID; 2875 lq_sta->drv = priv; 2876 2877 /* Set last_txrate_idx to lowest rate */ 2878 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta); 2879 if (sband->band == NL80211_BAND_5GHZ) 2880 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE; 2881 lq_sta->is_agg = 0; 2882 #ifdef CONFIG_MAC80211_DEBUGFS 2883 lq_sta->dbg_fixed_rate = 0; 2884 #endif 2885 2886 rs_initialize_lq(priv, sta, lq_sta); 2887 } 2888 2889 static void rs_fill_link_cmd(struct iwl_priv *priv, 2890 struct iwl_lq_sta *lq_sta, u32 new_rate) 2891 { 2892 struct iwl_scale_tbl_info tbl_type; 2893 int index = 0; 2894 int rate_idx; 2895 int repeat_rate = 0; 2896 u8 ant_toggle_cnt = 0; 2897 u8 use_ht_possible = 1; 2898 u8 valid_tx_ant = 0; 2899 struct iwl_station_priv *sta_priv = 2900 container_of(lq_sta, struct iwl_station_priv, lq_sta); 2901 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq; 2902 2903 /* Override starting rate (index 0) if needed for debug purposes */ 2904 rs_dbgfs_set_mcs(lq_sta, &new_rate, index); 2905 2906 /* Interpret new_rate (rate_n_flags) */ 2907 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, 2908 &tbl_type, &rate_idx); 2909 2910 if (priv && priv->bt_full_concurrent) { 2911 /* 1x1 only */ 2912 tbl_type.ant_type = 2913 first_antenna(priv->nvm_data->valid_tx_ant); 2914 } 2915 2916 /* How many times should we repeat the initial rate? */ 2917 if (is_legacy(tbl_type.lq_type)) { 2918 ant_toggle_cnt = 1; 2919 repeat_rate = IWL_NUMBER_TRY; 2920 } else { 2921 repeat_rate = min(IWL_HT_NUMBER_TRY, 2922 LINK_QUAL_AGG_DISABLE_START_DEF - 1); 2923 } 2924 2925 lq_cmd->general_params.mimo_delimiter = 2926 is_mimo(tbl_type.lq_type) ? 1 : 0; 2927 2928 /* Fill 1st table entry (index 0) */ 2929 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate); 2930 2931 if (num_of_ant(tbl_type.ant_type) == 1) { 2932 lq_cmd->general_params.single_stream_ant_msk = 2933 tbl_type.ant_type; 2934 } else if (num_of_ant(tbl_type.ant_type) == 2) { 2935 lq_cmd->general_params.dual_stream_ant_msk = 2936 tbl_type.ant_type; 2937 } /* otherwise we don't modify the existing value */ 2938 2939 index++; 2940 repeat_rate--; 2941 if (priv) { 2942 if (priv->bt_full_concurrent) 2943 valid_tx_ant = ANT_A; 2944 else 2945 valid_tx_ant = priv->nvm_data->valid_tx_ant; 2946 } 2947 2948 /* Fill rest of rate table */ 2949 while (index < LINK_QUAL_MAX_RETRY_NUM) { 2950 /* Repeat initial/next rate. 2951 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute. 2952 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */ 2953 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) { 2954 if (is_legacy(tbl_type.lq_type)) { 2955 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE) 2956 ant_toggle_cnt++; 2957 else if (priv && 2958 rs_toggle_antenna(valid_tx_ant, 2959 &new_rate, &tbl_type)) 2960 ant_toggle_cnt = 1; 2961 } 2962 2963 /* Override next rate if needed for debug purposes */ 2964 rs_dbgfs_set_mcs(lq_sta, &new_rate, index); 2965 2966 /* Fill next table entry */ 2967 lq_cmd->rs_table[index].rate_n_flags = 2968 cpu_to_le32(new_rate); 2969 repeat_rate--; 2970 index++; 2971 } 2972 2973 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type, 2974 &rate_idx); 2975 2976 if (priv && priv->bt_full_concurrent) { 2977 /* 1x1 only */ 2978 tbl_type.ant_type = 2979 first_antenna(priv->nvm_data->valid_tx_ant); 2980 } 2981 2982 /* Indicate to uCode which entries might be MIMO. 2983 * If initial rate was MIMO, this will finally end up 2984 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */ 2985 if (is_mimo(tbl_type.lq_type)) 2986 lq_cmd->general_params.mimo_delimiter = index; 2987 2988 /* Get next rate */ 2989 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx, 2990 use_ht_possible); 2991 2992 /* How many times should we repeat the next rate? */ 2993 if (is_legacy(tbl_type.lq_type)) { 2994 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE) 2995 ant_toggle_cnt++; 2996 else if (priv && 2997 rs_toggle_antenna(valid_tx_ant, 2998 &new_rate, &tbl_type)) 2999 ant_toggle_cnt = 1; 3000 3001 repeat_rate = IWL_NUMBER_TRY; 3002 } else { 3003 repeat_rate = IWL_HT_NUMBER_TRY; 3004 } 3005 3006 /* Don't allow HT rates after next pass. 3007 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */ 3008 use_ht_possible = 0; 3009 3010 /* Override next rate if needed for debug purposes */ 3011 rs_dbgfs_set_mcs(lq_sta, &new_rate, index); 3012 3013 /* Fill next table entry */ 3014 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate); 3015 3016 index++; 3017 repeat_rate--; 3018 } 3019 3020 lq_cmd->agg_params.agg_frame_cnt_limit = 3021 sta_priv->max_agg_bufsize ?: LINK_QUAL_AGG_FRAME_LIMIT_DEF; 3022 lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF; 3023 3024 lq_cmd->agg_params.agg_time_limit = 3025 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF); 3026 /* 3027 * overwrite if needed, pass aggregation time limit 3028 * to uCode in uSec 3029 */ 3030 if (priv && priv->lib->bt_params && 3031 priv->lib->bt_params->agg_time_limit && 3032 priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) 3033 lq_cmd->agg_params.agg_time_limit = 3034 cpu_to_le16(priv->lib->bt_params->agg_time_limit); 3035 } 3036 3037 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) 3038 { 3039 return hw->priv; 3040 } 3041 /* rate scale requires free function to be implemented */ 3042 static void rs_free(void *priv_rate) 3043 { 3044 return; 3045 } 3046 3047 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta, 3048 void *priv_sta) 3049 { 3050 struct iwl_op_mode *op_mode __maybe_unused = priv_r; 3051 struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode); 3052 3053 IWL_DEBUG_RATE(priv, "enter\n"); 3054 IWL_DEBUG_RATE(priv, "leave\n"); 3055 } 3056 3057 #ifdef CONFIG_MAC80211_DEBUGFS 3058 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta, 3059 u32 *rate_n_flags, int index) 3060 { 3061 struct iwl_priv *priv; 3062 u8 valid_tx_ant; 3063 u8 ant_sel_tx; 3064 3065 priv = lq_sta->drv; 3066 valid_tx_ant = priv->nvm_data->valid_tx_ant; 3067 if (lq_sta->dbg_fixed_rate) { 3068 ant_sel_tx = 3069 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK) 3070 >> RATE_MCS_ANT_POS); 3071 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) { 3072 *rate_n_flags = lq_sta->dbg_fixed_rate; 3073 IWL_DEBUG_RATE(priv, "Fixed rate ON\n"); 3074 } else { 3075 lq_sta->dbg_fixed_rate = 0; 3076 IWL_ERR(priv, 3077 "Invalid antenna selection 0x%X, Valid is 0x%X\n", 3078 ant_sel_tx, valid_tx_ant); 3079 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n"); 3080 } 3081 } else { 3082 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n"); 3083 } 3084 } 3085 3086 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file, 3087 const char __user *user_buf, size_t count, loff_t *ppos) 3088 { 3089 struct iwl_lq_sta *lq_sta = file->private_data; 3090 struct iwl_priv *priv; 3091 char buf[64]; 3092 size_t buf_size; 3093 u32 parsed_rate; 3094 3095 3096 priv = lq_sta->drv; 3097 memset(buf, 0, sizeof(buf)); 3098 buf_size = min(count, sizeof(buf) - 1); 3099 if (copy_from_user(buf, user_buf, buf_size)) 3100 return -EFAULT; 3101 3102 if (sscanf(buf, "%x", &parsed_rate) == 1) 3103 lq_sta->dbg_fixed_rate = parsed_rate; 3104 else 3105 lq_sta->dbg_fixed_rate = 0; 3106 3107 rs_program_fix_rate(priv, lq_sta); 3108 3109 return count; 3110 } 3111 3112 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file, 3113 char __user *user_buf, size_t count, loff_t *ppos) 3114 { 3115 char *buff; 3116 int desc = 0; 3117 int i = 0; 3118 int index = 0; 3119 ssize_t ret; 3120 3121 struct iwl_lq_sta *lq_sta = file->private_data; 3122 struct iwl_priv *priv; 3123 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 3124 3125 priv = lq_sta->drv; 3126 buff = kmalloc(1024, GFP_KERNEL); 3127 if (!buff) 3128 return -ENOMEM; 3129 3130 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id); 3131 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n", 3132 lq_sta->total_failed, lq_sta->total_success, 3133 lq_sta->active_legacy_rate); 3134 desc += sprintf(buff+desc, "fixed rate 0x%X\n", 3135 lq_sta->dbg_fixed_rate); 3136 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n", 3137 (priv->nvm_data->valid_tx_ant & ANT_A) ? "ANT_A," : "", 3138 (priv->nvm_data->valid_tx_ant & ANT_B) ? "ANT_B," : "", 3139 (priv->nvm_data->valid_tx_ant & ANT_C) ? "ANT_C" : ""); 3140 desc += sprintf(buff+desc, "lq type %s\n", 3141 (is_legacy(tbl->lq_type)) ? "legacy" : "HT"); 3142 if (is_Ht(tbl->lq_type)) { 3143 desc += sprintf(buff + desc, " %s", 3144 (is_siso(tbl->lq_type)) ? "SISO" : 3145 ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3")); 3146 desc += sprintf(buff + desc, " %s", 3147 (tbl->is_ht40) ? "40MHz" : "20MHz"); 3148 desc += sprintf(buff + desc, " %s %s %s\n", 3149 (tbl->is_SGI) ? "SGI" : "", 3150 (lq_sta->is_green) ? "GF enabled" : "", 3151 (lq_sta->is_agg) ? "AGG on" : ""); 3152 } 3153 desc += sprintf(buff+desc, "last tx rate=0x%X\n", 3154 lq_sta->last_rate_n_flags); 3155 desc += sprintf(buff+desc, "general:" 3156 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n", 3157 lq_sta->lq.general_params.flags, 3158 lq_sta->lq.general_params.mimo_delimiter, 3159 lq_sta->lq.general_params.single_stream_ant_msk, 3160 lq_sta->lq.general_params.dual_stream_ant_msk); 3161 3162 desc += sprintf(buff+desc, "agg:" 3163 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n", 3164 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit), 3165 lq_sta->lq.agg_params.agg_dis_start_th, 3166 lq_sta->lq.agg_params.agg_frame_cnt_limit); 3167 3168 desc += sprintf(buff+desc, 3169 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n", 3170 lq_sta->lq.general_params.start_rate_index[0], 3171 lq_sta->lq.general_params.start_rate_index[1], 3172 lq_sta->lq.general_params.start_rate_index[2], 3173 lq_sta->lq.general_params.start_rate_index[3]); 3174 3175 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) { 3176 index = iwl_hwrate_to_plcp_idx( 3177 le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags)); 3178 if (is_legacy(tbl->lq_type)) { 3179 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n", 3180 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags), 3181 iwl_rate_mcs[index].mbps); 3182 } else { 3183 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n", 3184 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags), 3185 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs); 3186 } 3187 } 3188 3189 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3190 kfree(buff); 3191 return ret; 3192 } 3193 3194 static const struct file_operations rs_sta_dbgfs_scale_table_ops = { 3195 .write = rs_sta_dbgfs_scale_table_write, 3196 .read = rs_sta_dbgfs_scale_table_read, 3197 .open = simple_open, 3198 .llseek = default_llseek, 3199 }; 3200 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file, 3201 char __user *user_buf, size_t count, loff_t *ppos) 3202 { 3203 char *buff; 3204 int desc = 0; 3205 int i, j; 3206 ssize_t ret; 3207 3208 struct iwl_lq_sta *lq_sta = file->private_data; 3209 3210 buff = kmalloc(1024, GFP_KERNEL); 3211 if (!buff) 3212 return -ENOMEM; 3213 3214 for (i = 0; i < LQ_SIZE; i++) { 3215 desc += sprintf(buff+desc, 3216 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n" 3217 "rate=0x%X\n", 3218 lq_sta->active_tbl == i ? "*" : "x", 3219 lq_sta->lq_info[i].lq_type, 3220 lq_sta->lq_info[i].is_SGI, 3221 lq_sta->lq_info[i].is_ht40, 3222 lq_sta->lq_info[i].is_dup, 3223 lq_sta->is_green, 3224 lq_sta->lq_info[i].current_rate); 3225 for (j = 0; j < IWL_RATE_COUNT; j++) { 3226 desc += sprintf(buff+desc, 3227 "counter=%d success=%d %%=%d\n", 3228 lq_sta->lq_info[i].win[j].counter, 3229 lq_sta->lq_info[i].win[j].success_counter, 3230 lq_sta->lq_info[i].win[j].success_ratio); 3231 } 3232 } 3233 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3234 kfree(buff); 3235 return ret; 3236 } 3237 3238 static const struct file_operations rs_sta_dbgfs_stats_table_ops = { 3239 .read = rs_sta_dbgfs_stats_table_read, 3240 .open = simple_open, 3241 .llseek = default_llseek, 3242 }; 3243 3244 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file, 3245 char __user *user_buf, size_t count, loff_t *ppos) 3246 { 3247 struct iwl_lq_sta *lq_sta = file->private_data; 3248 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl]; 3249 char buff[120]; 3250 int desc = 0; 3251 3252 if (is_Ht(tbl->lq_type)) 3253 desc += sprintf(buff+desc, 3254 "Bit Rate= %d Mb/s\n", 3255 tbl->expected_tpt[lq_sta->last_txrate_idx]); 3256 else 3257 desc += sprintf(buff+desc, 3258 "Bit Rate= %d Mb/s\n", 3259 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1); 3260 3261 return simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3262 } 3263 3264 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = { 3265 .read = rs_sta_dbgfs_rate_scale_data_read, 3266 .open = simple_open, 3267 .llseek = default_llseek, 3268 }; 3269 3270 static void rs_add_debugfs(void *priv, void *priv_sta, 3271 struct dentry *dir) 3272 { 3273 struct iwl_lq_sta *lq_sta = priv_sta; 3274 lq_sta->rs_sta_dbgfs_scale_table_file = 3275 debugfs_create_file("rate_scale_table", 0600, dir, 3276 lq_sta, &rs_sta_dbgfs_scale_table_ops); 3277 lq_sta->rs_sta_dbgfs_stats_table_file = 3278 debugfs_create_file("rate_stats_table", 0400, dir, 3279 lq_sta, &rs_sta_dbgfs_stats_table_ops); 3280 lq_sta->rs_sta_dbgfs_rate_scale_data_file = 3281 debugfs_create_file("rate_scale_data", 0400, dir, 3282 lq_sta, &rs_sta_dbgfs_rate_scale_data_ops); 3283 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file = 3284 debugfs_create_u8("tx_agg_tid_enable", 0600, dir, 3285 &lq_sta->tx_agg_tid_en); 3286 3287 } 3288 3289 static void rs_remove_debugfs(void *priv, void *priv_sta) 3290 { 3291 struct iwl_lq_sta *lq_sta = priv_sta; 3292 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file); 3293 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file); 3294 debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file); 3295 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file); 3296 } 3297 #endif 3298 3299 /* 3300 * Initialization of rate scaling information is done by driver after 3301 * the station is added. Since mac80211 calls this function before a 3302 * station is added we ignore it. 3303 */ 3304 static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband, 3305 struct cfg80211_chan_def *chandef, 3306 struct ieee80211_sta *sta, void *priv_sta) 3307 { 3308 } 3309 3310 static const struct rate_control_ops rs_ops = { 3311 .name = RS_NAME, 3312 .tx_status = rs_tx_status, 3313 .get_rate = rs_get_rate, 3314 .rate_init = rs_rate_init_stub, 3315 .alloc = rs_alloc, 3316 .free = rs_free, 3317 .alloc_sta = rs_alloc_sta, 3318 .free_sta = rs_free_sta, 3319 #ifdef CONFIG_MAC80211_DEBUGFS 3320 .add_sta_debugfs = rs_add_debugfs, 3321 .remove_sta_debugfs = rs_remove_debugfs, 3322 #endif 3323 }; 3324 3325 int iwlagn_rate_control_register(void) 3326 { 3327 return ieee80211_rate_control_register(&rs_ops); 3328 } 3329 3330 void iwlagn_rate_control_unregister(void) 3331 { 3332 ieee80211_rate_control_unregister(&rs_ops); 3333 } 3334 3335