1 /****************************************************************************** 2 * 3 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved. 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms of version 2 of the GNU General Public License as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 12 * more details. 13 * 14 * You should have received a copy of the GNU General Public License along with 15 * this program; if not, write to the Free Software Foundation, Inc., 16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA 17 * 18 * The full GNU General Public License is included in this distribution in the 19 * file called LICENSE. 20 * 21 * Contact Information: 22 * Intel Linux Wireless <linuxwifi@intel.com> 23 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 24 * 25 *****************************************************************************/ 26 #include <linux/kernel.h> 27 #include <linux/skbuff.h> 28 #include <linux/slab.h> 29 #include <net/mac80211.h> 30 31 #include <linux/netdevice.h> 32 #include <linux/etherdevice.h> 33 #include <linux/delay.h> 34 35 #include <linux/workqueue.h> 36 37 #include "dev.h" 38 #include "agn.h" 39 40 #define RS_NAME "iwl-agn-rs" 41 42 #define NUM_TRY_BEFORE_ANT_TOGGLE 1 43 #define IWL_NUMBER_TRY 1 44 #define IWL_HT_NUMBER_TRY 3 45 46 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */ 47 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */ 48 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */ 49 50 /* max allowed rate miss before sync LQ cmd */ 51 #define IWL_MISSED_RATE_MAX 15 52 /* max time to accum history 2 seconds */ 53 #define IWL_RATE_SCALE_FLUSH_INTVL (3*HZ) 54 55 static u8 rs_ht_to_legacy[] = { 56 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX, 57 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX, 58 IWL_RATE_6M_INDEX, 59 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX, 60 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX, 61 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX, 62 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX 63 }; 64 65 static const u8 ant_toggle_lookup[] = { 66 /*ANT_NONE -> */ ANT_NONE, 67 /*ANT_A -> */ ANT_B, 68 /*ANT_B -> */ ANT_C, 69 /*ANT_AB -> */ ANT_BC, 70 /*ANT_C -> */ ANT_A, 71 /*ANT_AC -> */ ANT_AB, 72 /*ANT_BC -> */ ANT_AC, 73 /*ANT_ABC -> */ ANT_ABC, 74 }; 75 76 #define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np) \ 77 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \ 78 IWL_RATE_SISO_##s##M_PLCP, \ 79 IWL_RATE_MIMO2_##s##M_PLCP,\ 80 IWL_RATE_MIMO3_##s##M_PLCP,\ 81 IWL_RATE_##r##M_IEEE, \ 82 IWL_RATE_##ip##M_INDEX, \ 83 IWL_RATE_##in##M_INDEX, \ 84 IWL_RATE_##rp##M_INDEX, \ 85 IWL_RATE_##rn##M_INDEX, \ 86 IWL_RATE_##pp##M_INDEX, \ 87 IWL_RATE_##np##M_INDEX } 88 89 /* 90 * Parameter order: 91 * rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate 92 * 93 * If there isn't a valid next or previous rate then INV is used which 94 * maps to IWL_RATE_INVALID 95 * 96 */ 97 const struct iwl_rate_info iwl_rates[IWL_RATE_COUNT] = { 98 IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2), /* 1mbps */ 99 IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5), /* 2mbps */ 100 IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11), /*5.5mbps */ 101 IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18), /* 11mbps */ 102 IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11), /* 6mbps */ 103 IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11), /* 9mbps */ 104 IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18), /* 12mbps */ 105 IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24), /* 18mbps */ 106 IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36), /* 24mbps */ 107 IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48), /* 36mbps */ 108 IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54), /* 48mbps */ 109 IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */ 110 IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */ 111 /* FIXME:RS: ^^ should be INV (legacy) */ 112 }; 113 114 static inline u8 rs_extract_rate(u32 rate_n_flags) 115 { 116 return (u8)(rate_n_flags & RATE_MCS_RATE_MSK); 117 } 118 119 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags) 120 { 121 int idx = 0; 122 123 /* HT rate format */ 124 if (rate_n_flags & RATE_MCS_HT_MSK) { 125 idx = rs_extract_rate(rate_n_flags); 126 127 if (idx >= IWL_RATE_MIMO3_6M_PLCP) 128 idx = idx - IWL_RATE_MIMO3_6M_PLCP; 129 else if (idx >= IWL_RATE_MIMO2_6M_PLCP) 130 idx = idx - IWL_RATE_MIMO2_6M_PLCP; 131 132 idx += IWL_FIRST_OFDM_RATE; 133 /* skip 9M not supported in ht*/ 134 if (idx >= IWL_RATE_9M_INDEX) 135 idx += 1; 136 if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE)) 137 return idx; 138 139 /* legacy rate format, search for match in table */ 140 } else { 141 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++) 142 if (iwl_rates[idx].plcp == 143 rs_extract_rate(rate_n_flags)) 144 return idx; 145 } 146 147 return -1; 148 } 149 150 static void rs_rate_scale_perform(struct iwl_priv *priv, 151 struct sk_buff *skb, 152 struct ieee80211_sta *sta, 153 struct iwl_lq_sta *lq_sta); 154 static void rs_fill_link_cmd(struct iwl_priv *priv, 155 struct iwl_lq_sta *lq_sta, u32 rate_n_flags); 156 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search); 157 158 159 #ifdef CONFIG_MAC80211_DEBUGFS 160 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta, 161 u32 *rate_n_flags, int index); 162 #else 163 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta, 164 u32 *rate_n_flags, int index) 165 {} 166 #endif 167 168 /** 169 * The following tables contain the expected throughput metrics for all rates 170 * 171 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits 172 * 173 * where invalid entries are zeros. 174 * 175 * CCK rates are only valid in legacy table and will only be used in G 176 * (2.4 GHz) band. 177 */ 178 179 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = { 180 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0 181 }; 182 183 static const u16 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = { 184 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202}, /* Norm */ 185 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210}, /* SGI */ 186 {0, 0, 0, 0, 47, 0, 91, 133, 171, 242, 305, 334, 362}, /* AGG */ 187 {0, 0, 0, 0, 52, 0, 101, 145, 187, 264, 330, 361, 390}, /* AGG+SGI */ 188 }; 189 190 static const u16 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = { 191 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */ 192 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */ 193 {0, 0, 0, 0, 94, 0, 177, 249, 313, 423, 512, 550, 586}, /* AGG */ 194 {0, 0, 0, 0, 104, 0, 193, 270, 338, 454, 545, 584, 620}, /* AGG+SGI */ 195 }; 196 197 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = { 198 {0, 0, 0, 0, 74, 0, 123, 155, 179, 214, 236, 244, 251}, /* Norm */ 199 {0, 0, 0, 0, 81, 0, 131, 164, 188, 223, 243, 251, 257}, /* SGI */ 200 {0, 0, 0, 0, 89, 0, 167, 235, 296, 402, 488, 526, 560}, /* AGG */ 201 {0, 0, 0, 0, 97, 0, 182, 255, 320, 431, 520, 558, 593}, /* AGG+SGI*/ 202 }; 203 204 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = { 205 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */ 206 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */ 207 {0, 0, 0, 0, 171, 0, 305, 410, 496, 634, 731, 771, 805}, /* AGG */ 208 {0, 0, 0, 0, 186, 0, 329, 439, 527, 667, 764, 803, 838}, /* AGG+SGI */ 209 }; 210 211 static const u16 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = { 212 {0, 0, 0, 0, 99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */ 213 {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */ 214 {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */ 215 {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */ 216 }; 217 218 static const u16 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = { 219 {0, 0, 0, 0, 152, 0, 211, 239, 255, 279, 290, 294, 297}, /* Norm */ 220 {0, 0, 0, 0, 160, 0, 219, 245, 261, 284, 294, 297, 300}, /* SGI */ 221 {0, 0, 0, 0, 254, 0, 443, 584, 695, 868, 984, 1030, 1070}, /* AGG */ 222 {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */ 223 }; 224 225 /* mbps, mcs */ 226 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = { 227 { "1", "BPSK DSSS"}, 228 { "2", "QPSK DSSS"}, 229 {"5.5", "BPSK CCK"}, 230 { "11", "QPSK CCK"}, 231 { "6", "BPSK 1/2"}, 232 { "9", "BPSK 1/2"}, 233 { "12", "QPSK 1/2"}, 234 { "18", "QPSK 3/4"}, 235 { "24", "16QAM 1/2"}, 236 { "36", "16QAM 3/4"}, 237 { "48", "64QAM 2/3"}, 238 { "54", "64QAM 3/4"}, 239 { "60", "64QAM 5/6"}, 240 }; 241 242 #define MCS_INDEX_PER_STREAM (8) 243 244 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window) 245 { 246 window->data = 0; 247 window->success_counter = 0; 248 window->success_ratio = IWL_INVALID_VALUE; 249 window->counter = 0; 250 window->average_tpt = IWL_INVALID_VALUE; 251 window->stamp = 0; 252 } 253 254 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type) 255 { 256 return (ant_type & valid_antenna) == ant_type; 257 } 258 259 /* 260 * removes the old data from the statistics. All data that is older than 261 * TID_MAX_TIME_DIFF, will be deleted. 262 */ 263 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time) 264 { 265 /* The oldest age we want to keep */ 266 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF; 267 268 while (tl->queue_count && 269 (tl->time_stamp < oldest_time)) { 270 tl->total -= tl->packet_count[tl->head]; 271 tl->packet_count[tl->head] = 0; 272 tl->time_stamp += TID_QUEUE_CELL_SPACING; 273 tl->queue_count--; 274 tl->head++; 275 if (tl->head >= TID_QUEUE_MAX_SIZE) 276 tl->head = 0; 277 } 278 } 279 280 /* 281 * increment traffic load value for tid and also remove 282 * any old values if passed the certain time period 283 */ 284 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data, 285 struct ieee80211_hdr *hdr) 286 { 287 u32 curr_time = jiffies_to_msecs(jiffies); 288 u32 time_diff; 289 s32 index; 290 struct iwl_traffic_load *tl = NULL; 291 u8 tid; 292 293 if (ieee80211_is_data_qos(hdr->frame_control)) { 294 u8 *qc = ieee80211_get_qos_ctl(hdr); 295 tid = qc[0] & 0xf; 296 } else 297 return IWL_MAX_TID_COUNT; 298 299 if (unlikely(tid >= IWL_MAX_TID_COUNT)) 300 return IWL_MAX_TID_COUNT; 301 302 tl = &lq_data->load[tid]; 303 304 curr_time -= curr_time % TID_ROUND_VALUE; 305 306 /* Happens only for the first packet. Initialize the data */ 307 if (!(tl->queue_count)) { 308 tl->total = 1; 309 tl->time_stamp = curr_time; 310 tl->queue_count = 1; 311 tl->head = 0; 312 tl->packet_count[0] = 1; 313 return IWL_MAX_TID_COUNT; 314 } 315 316 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time); 317 index = time_diff / TID_QUEUE_CELL_SPACING; 318 319 /* The history is too long: remove data that is older than */ 320 /* TID_MAX_TIME_DIFF */ 321 if (index >= TID_QUEUE_MAX_SIZE) 322 rs_tl_rm_old_stats(tl, curr_time); 323 324 index = (tl->head + index) % TID_QUEUE_MAX_SIZE; 325 tl->packet_count[index] = tl->packet_count[index] + 1; 326 tl->total = tl->total + 1; 327 328 if ((index + 1) > tl->queue_count) 329 tl->queue_count = index + 1; 330 331 return tid; 332 } 333 334 #ifdef CONFIG_MAC80211_DEBUGFS 335 /** 336 * Program the device to use fixed rate for frame transmit 337 * This is for debugging/testing only 338 * once the device start use fixed rate, we need to reload the module 339 * to being back the normal operation. 340 */ 341 static void rs_program_fix_rate(struct iwl_priv *priv, 342 struct iwl_lq_sta *lq_sta) 343 { 344 struct iwl_station_priv *sta_priv = 345 container_of(lq_sta, struct iwl_station_priv, lq_sta); 346 struct iwl_rxon_context *ctx = sta_priv->ctx; 347 348 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */ 349 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 350 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 351 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 352 353 IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n", 354 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate); 355 356 if (lq_sta->dbg_fixed_rate) { 357 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate); 358 iwl_send_lq_cmd(lq_sta->drv, ctx, &lq_sta->lq, CMD_ASYNC, 359 false); 360 } 361 } 362 #endif 363 364 /* 365 get the traffic load value for tid 366 */ 367 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid) 368 { 369 u32 curr_time = jiffies_to_msecs(jiffies); 370 u32 time_diff; 371 s32 index; 372 struct iwl_traffic_load *tl = NULL; 373 374 if (tid >= IWL_MAX_TID_COUNT) 375 return 0; 376 377 tl = &(lq_data->load[tid]); 378 379 curr_time -= curr_time % TID_ROUND_VALUE; 380 381 if (!(tl->queue_count)) 382 return 0; 383 384 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time); 385 index = time_diff / TID_QUEUE_CELL_SPACING; 386 387 /* The history is too long: remove data that is older than */ 388 /* TID_MAX_TIME_DIFF */ 389 if (index >= TID_QUEUE_MAX_SIZE) 390 rs_tl_rm_old_stats(tl, curr_time); 391 392 return tl->total; 393 } 394 395 static int rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv, 396 struct iwl_lq_sta *lq_data, u8 tid, 397 struct ieee80211_sta *sta) 398 { 399 int ret = -EAGAIN; 400 u32 load; 401 402 /* 403 * Don't create TX aggregation sessions when in high 404 * BT traffic, as they would just be disrupted by BT. 405 */ 406 if (priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) { 407 IWL_DEBUG_COEX(priv, 408 "BT traffic (%d), no aggregation allowed\n", 409 priv->bt_traffic_load); 410 return ret; 411 } 412 413 load = rs_tl_get_load(lq_data, tid); 414 415 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n", 416 sta->addr, tid); 417 ret = ieee80211_start_tx_ba_session(sta, tid, 5000); 418 if (ret == -EAGAIN) { 419 /* 420 * driver and mac80211 is out of sync 421 * this might be cause by reloading firmware 422 * stop the tx ba session here 423 */ 424 IWL_ERR(priv, "Fail start Tx agg on tid: %d\n", 425 tid); 426 ieee80211_stop_tx_ba_session(sta, tid); 427 } 428 return ret; 429 } 430 431 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid, 432 struct iwl_lq_sta *lq_data, 433 struct ieee80211_sta *sta) 434 { 435 if (tid < IWL_MAX_TID_COUNT) 436 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta); 437 else 438 IWL_ERR(priv, "tid exceeds max TID count: %d/%d\n", 439 tid, IWL_MAX_TID_COUNT); 440 } 441 442 static inline int get_num_of_ant_from_rate(u32 rate_n_flags) 443 { 444 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) + 445 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) + 446 !!(rate_n_flags & RATE_MCS_ANT_C_MSK); 447 } 448 449 /* 450 * Static function to get the expected throughput from an iwl_scale_tbl_info 451 * that wraps a NULL pointer check 452 */ 453 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index) 454 { 455 if (tbl->expected_tpt) 456 return tbl->expected_tpt[rs_index]; 457 return 0; 458 } 459 460 /** 461 * rs_collect_tx_data - Update the success/failure sliding window 462 * 463 * We keep a sliding window of the last 62 packets transmitted 464 * at this rate. window->data contains the bitmask of successful 465 * packets. 466 */ 467 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl, 468 int scale_index, int attempts, int successes) 469 { 470 struct iwl_rate_scale_data *window = NULL; 471 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1)); 472 s32 fail_count, tpt; 473 474 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT) 475 return -EINVAL; 476 477 /* Select window for current tx bit rate */ 478 window = &(tbl->win[scale_index]); 479 480 /* Get expected throughput */ 481 tpt = get_expected_tpt(tbl, scale_index); 482 483 /* 484 * Keep track of only the latest 62 tx frame attempts in this rate's 485 * history window; anything older isn't really relevant any more. 486 * If we have filled up the sliding window, drop the oldest attempt; 487 * if the oldest attempt (highest bit in bitmap) shows "success", 488 * subtract "1" from the success counter (this is the main reason 489 * we keep these bitmaps!). 490 */ 491 while (attempts > 0) { 492 if (window->counter >= IWL_RATE_MAX_WINDOW) { 493 494 /* remove earliest */ 495 window->counter = IWL_RATE_MAX_WINDOW - 1; 496 497 if (window->data & mask) { 498 window->data &= ~mask; 499 window->success_counter--; 500 } 501 } 502 503 /* Increment frames-attempted counter */ 504 window->counter++; 505 506 /* Shift bitmap by one frame to throw away oldest history */ 507 window->data <<= 1; 508 509 /* Mark the most recent #successes attempts as successful */ 510 if (successes > 0) { 511 window->success_counter++; 512 window->data |= 0x1; 513 successes--; 514 } 515 516 attempts--; 517 } 518 519 /* Calculate current success ratio, avoid divide-by-0! */ 520 if (window->counter > 0) 521 window->success_ratio = 128 * (100 * window->success_counter) 522 / window->counter; 523 else 524 window->success_ratio = IWL_INVALID_VALUE; 525 526 fail_count = window->counter - window->success_counter; 527 528 /* Calculate average throughput, if we have enough history. */ 529 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) || 530 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH)) 531 window->average_tpt = (window->success_ratio * tpt + 64) / 128; 532 else 533 window->average_tpt = IWL_INVALID_VALUE; 534 535 /* Tag this window as having been updated */ 536 window->stamp = jiffies; 537 538 return 0; 539 } 540 541 /* 542 * Fill uCode API rate_n_flags field, based on "search" or "active" table. 543 */ 544 /* FIXME:RS:remove this function and put the flags statically in the table */ 545 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv, 546 struct iwl_scale_tbl_info *tbl, 547 int index, u8 use_green) 548 { 549 u32 rate_n_flags = 0; 550 551 if (is_legacy(tbl->lq_type)) { 552 rate_n_flags = iwl_rates[index].plcp; 553 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE) 554 rate_n_flags |= RATE_MCS_CCK_MSK; 555 556 } else if (is_Ht(tbl->lq_type)) { 557 if (index > IWL_LAST_OFDM_RATE) { 558 IWL_ERR(priv, "Invalid HT rate index %d\n", index); 559 index = IWL_LAST_OFDM_RATE; 560 } 561 rate_n_flags = RATE_MCS_HT_MSK; 562 563 if (is_siso(tbl->lq_type)) 564 rate_n_flags |= iwl_rates[index].plcp_siso; 565 else if (is_mimo2(tbl->lq_type)) 566 rate_n_flags |= iwl_rates[index].plcp_mimo2; 567 else 568 rate_n_flags |= iwl_rates[index].plcp_mimo3; 569 } else { 570 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type); 571 } 572 573 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) & 574 RATE_MCS_ANT_ABC_MSK); 575 576 if (is_Ht(tbl->lq_type)) { 577 if (tbl->is_ht40) { 578 if (tbl->is_dup) 579 rate_n_flags |= RATE_MCS_DUP_MSK; 580 else 581 rate_n_flags |= RATE_MCS_HT40_MSK; 582 } 583 if (tbl->is_SGI) 584 rate_n_flags |= RATE_MCS_SGI_MSK; 585 586 if (use_green) { 587 rate_n_flags |= RATE_MCS_GF_MSK; 588 if (is_siso(tbl->lq_type) && tbl->is_SGI) { 589 rate_n_flags &= ~RATE_MCS_SGI_MSK; 590 IWL_ERR(priv, "GF was set with SGI:SISO\n"); 591 } 592 } 593 } 594 return rate_n_flags; 595 } 596 597 /* 598 * Interpret uCode API's rate_n_flags format, 599 * fill "search" or "active" tx mode table. 600 */ 601 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags, 602 enum nl80211_band band, 603 struct iwl_scale_tbl_info *tbl, 604 int *rate_idx) 605 { 606 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK); 607 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags); 608 u8 mcs; 609 610 memset(tbl, 0, sizeof(struct iwl_scale_tbl_info)); 611 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags); 612 613 if (*rate_idx == IWL_RATE_INVALID) { 614 *rate_idx = -1; 615 return -EINVAL; 616 } 617 tbl->is_SGI = 0; /* default legacy setup */ 618 tbl->is_ht40 = 0; 619 tbl->is_dup = 0; 620 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS); 621 tbl->lq_type = LQ_NONE; 622 tbl->max_search = IWL_MAX_SEARCH; 623 624 /* legacy rate format */ 625 if (!(rate_n_flags & RATE_MCS_HT_MSK)) { 626 if (num_of_ant == 1) { 627 if (band == NL80211_BAND_5GHZ) 628 tbl->lq_type = LQ_A; 629 else 630 tbl->lq_type = LQ_G; 631 } 632 /* HT rate format */ 633 } else { 634 if (rate_n_flags & RATE_MCS_SGI_MSK) 635 tbl->is_SGI = 1; 636 637 if ((rate_n_flags & RATE_MCS_HT40_MSK) || 638 (rate_n_flags & RATE_MCS_DUP_MSK)) 639 tbl->is_ht40 = 1; 640 641 if (rate_n_flags & RATE_MCS_DUP_MSK) 642 tbl->is_dup = 1; 643 644 mcs = rs_extract_rate(rate_n_flags); 645 646 /* SISO */ 647 if (mcs <= IWL_RATE_SISO_60M_PLCP) { 648 if (num_of_ant == 1) 649 tbl->lq_type = LQ_SISO; /*else NONE*/ 650 /* MIMO2 */ 651 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) { 652 if (num_of_ant == 2) 653 tbl->lq_type = LQ_MIMO2; 654 /* MIMO3 */ 655 } else { 656 if (num_of_ant == 3) { 657 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH; 658 tbl->lq_type = LQ_MIMO3; 659 } 660 } 661 } 662 return 0; 663 } 664 665 /* switch to another antenna/antennas and return 1 */ 666 /* if no other valid antenna found, return 0 */ 667 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags, 668 struct iwl_scale_tbl_info *tbl) 669 { 670 u8 new_ant_type; 671 672 if (!tbl->ant_type || tbl->ant_type > ANT_ABC) 673 return 0; 674 675 if (!rs_is_valid_ant(valid_ant, tbl->ant_type)) 676 return 0; 677 678 new_ant_type = ant_toggle_lookup[tbl->ant_type]; 679 680 while ((new_ant_type != tbl->ant_type) && 681 !rs_is_valid_ant(valid_ant, new_ant_type)) 682 new_ant_type = ant_toggle_lookup[new_ant_type]; 683 684 if (new_ant_type == tbl->ant_type) 685 return 0; 686 687 tbl->ant_type = new_ant_type; 688 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK; 689 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS; 690 return 1; 691 } 692 693 /** 694 * Green-field mode is valid if the station supports it and 695 * there are no non-GF stations present in the BSS. 696 */ 697 static bool rs_use_green(struct ieee80211_sta *sta) 698 { 699 /* 700 * There's a bug somewhere in this code that causes the 701 * scaling to get stuck because GF+SGI can't be combined 702 * in SISO rates. Until we find that bug, disable GF, it 703 * has only limited benefit and we still interoperate with 704 * GF APs since we can always receive GF transmissions. 705 */ 706 return false; 707 } 708 709 /** 710 * rs_get_supported_rates - get the available rates 711 * 712 * if management frame or broadcast frame only return 713 * basic available rates. 714 * 715 */ 716 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta, 717 struct ieee80211_hdr *hdr, 718 enum iwl_table_type rate_type) 719 { 720 if (is_legacy(rate_type)) { 721 return lq_sta->active_legacy_rate; 722 } else { 723 if (is_siso(rate_type)) 724 return lq_sta->active_siso_rate; 725 else if (is_mimo2(rate_type)) 726 return lq_sta->active_mimo2_rate; 727 else 728 return lq_sta->active_mimo3_rate; 729 } 730 } 731 732 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask, 733 int rate_type) 734 { 735 u8 high = IWL_RATE_INVALID; 736 u8 low = IWL_RATE_INVALID; 737 738 /* 802.11A or ht walks to the next literal adjacent rate in 739 * the rate table */ 740 if (is_a_band(rate_type) || !is_legacy(rate_type)) { 741 int i; 742 u32 mask; 743 744 /* Find the previous rate that is in the rate mask */ 745 i = index - 1; 746 for (mask = (1 << i); i >= 0; i--, mask >>= 1) { 747 if (rate_mask & mask) { 748 low = i; 749 break; 750 } 751 } 752 753 /* Find the next rate that is in the rate mask */ 754 i = index + 1; 755 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) { 756 if (rate_mask & mask) { 757 high = i; 758 break; 759 } 760 } 761 762 return (high << 8) | low; 763 } 764 765 low = index; 766 while (low != IWL_RATE_INVALID) { 767 low = iwl_rates[low].prev_rs; 768 if (low == IWL_RATE_INVALID) 769 break; 770 if (rate_mask & (1 << low)) 771 break; 772 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low); 773 } 774 775 high = index; 776 while (high != IWL_RATE_INVALID) { 777 high = iwl_rates[high].next_rs; 778 if (high == IWL_RATE_INVALID) 779 break; 780 if (rate_mask & (1 << high)) 781 break; 782 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high); 783 } 784 785 return (high << 8) | low; 786 } 787 788 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta, 789 struct iwl_scale_tbl_info *tbl, 790 u8 scale_index, u8 ht_possible) 791 { 792 s32 low; 793 u16 rate_mask; 794 u16 high_low; 795 u8 switch_to_legacy = 0; 796 u8 is_green = lq_sta->is_green; 797 struct iwl_priv *priv = lq_sta->drv; 798 799 /* check if we need to switch from HT to legacy rates. 800 * assumption is that mandatory rates (1Mbps or 6Mbps) 801 * are always supported (spec demand) */ 802 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) { 803 switch_to_legacy = 1; 804 scale_index = rs_ht_to_legacy[scale_index]; 805 if (lq_sta->band == NL80211_BAND_5GHZ) 806 tbl->lq_type = LQ_A; 807 else 808 tbl->lq_type = LQ_G; 809 810 if (num_of_ant(tbl->ant_type) > 1) 811 tbl->ant_type = 812 first_antenna(priv->nvm_data->valid_tx_ant); 813 814 tbl->is_ht40 = 0; 815 tbl->is_SGI = 0; 816 tbl->max_search = IWL_MAX_SEARCH; 817 } 818 819 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type); 820 821 /* Mask with station rate restriction */ 822 if (is_legacy(tbl->lq_type)) { 823 /* supp_rates has no CCK bits in A mode */ 824 if (lq_sta->band == NL80211_BAND_5GHZ) 825 rate_mask = (u16)(rate_mask & 826 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE)); 827 else 828 rate_mask = (u16)(rate_mask & lq_sta->supp_rates); 829 } 830 831 /* If we switched from HT to legacy, check current rate */ 832 if (switch_to_legacy && (rate_mask & (1 << scale_index))) { 833 low = scale_index; 834 goto out; 835 } 836 837 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask, 838 tbl->lq_type); 839 low = high_low & 0xff; 840 841 if (low == IWL_RATE_INVALID) 842 low = scale_index; 843 844 out: 845 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green); 846 } 847 848 /* 849 * Simple function to compare two rate scale table types 850 */ 851 static bool table_type_matches(struct iwl_scale_tbl_info *a, 852 struct iwl_scale_tbl_info *b) 853 { 854 return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) && 855 (a->is_SGI == b->is_SGI); 856 } 857 858 static void rs_bt_update_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx, 859 struct iwl_lq_sta *lq_sta) 860 { 861 struct iwl_scale_tbl_info *tbl; 862 bool full_concurrent = priv->bt_full_concurrent; 863 864 if (priv->bt_ant_couple_ok) { 865 /* 866 * Is there a need to switch between 867 * full concurrency and 3-wire? 868 */ 869 if (priv->bt_ci_compliance && priv->bt_ant_couple_ok) 870 full_concurrent = true; 871 else 872 full_concurrent = false; 873 } 874 if ((priv->bt_traffic_load != priv->last_bt_traffic_load) || 875 (priv->bt_full_concurrent != full_concurrent)) { 876 priv->bt_full_concurrent = full_concurrent; 877 priv->last_bt_traffic_load = priv->bt_traffic_load; 878 879 /* Update uCode's rate table. */ 880 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 881 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate); 882 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false); 883 884 queue_work(priv->workqueue, &priv->bt_full_concurrency); 885 } 886 } 887 888 /* 889 * mac80211 sends us Tx status 890 */ 891 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband, 892 struct ieee80211_sta *sta, void *priv_sta, 893 struct sk_buff *skb) 894 { 895 int legacy_success; 896 int retries; 897 int rs_index, mac_index, i; 898 struct iwl_lq_sta *lq_sta = priv_sta; 899 struct iwl_link_quality_cmd *table; 900 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 901 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)priv_r; 902 struct iwl_priv *priv = IWL_OP_MODE_GET_DVM(op_mode); 903 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 904 enum mac80211_rate_control_flags mac_flags; 905 u32 tx_rate; 906 struct iwl_scale_tbl_info tbl_type; 907 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl; 908 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv; 909 struct iwl_rxon_context *ctx = sta_priv->ctx; 910 911 IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n"); 912 913 /* Treat uninitialized rate scaling data same as non-existing. */ 914 if (!lq_sta) { 915 IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n"); 916 return; 917 } else if (!lq_sta->drv) { 918 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n"); 919 return; 920 } 921 922 if (!ieee80211_is_data(hdr->frame_control) || 923 info->flags & IEEE80211_TX_CTL_NO_ACK) 924 return; 925 926 /* This packet was aggregated but doesn't carry status info */ 927 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 928 !(info->flags & IEEE80211_TX_STAT_AMPDU)) 929 return; 930 931 /* 932 * Ignore this Tx frame response if its initial rate doesn't match 933 * that of latest Link Quality command. There may be stragglers 934 * from a previous Link Quality command, but we're no longer interested 935 * in those; they're either from the "active" mode while we're trying 936 * to check "search" mode, or a prior "search" mode after we've moved 937 * to a new "search" mode (which might become the new "active" mode). 938 */ 939 table = &lq_sta->lq; 940 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags); 941 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index); 942 if (priv->band == NL80211_BAND_5GHZ) 943 rs_index -= IWL_FIRST_OFDM_RATE; 944 mac_flags = info->status.rates[0].flags; 945 mac_index = info->status.rates[0].idx; 946 /* For HT packets, map MCS to PLCP */ 947 if (mac_flags & IEEE80211_TX_RC_MCS) { 948 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */ 949 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE)) 950 mac_index++; 951 /* 952 * mac80211 HT index is always zero-indexed; we need to move 953 * HT OFDM rates after CCK rates in 2.4 GHz band 954 */ 955 if (priv->band == NL80211_BAND_2GHZ) 956 mac_index += IWL_FIRST_OFDM_RATE; 957 } 958 /* Here we actually compare this rate to the latest LQ command */ 959 if ((mac_index < 0) || 960 (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) || 961 (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) || 962 (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) || 963 (tbl_type.ant_type != info->status.antenna) || 964 (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) || 965 (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) || 966 (rs_index != mac_index)) { 967 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate); 968 /* 969 * Since rates mis-match, the last LQ command may have failed. 970 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with 971 * ... driver. 972 */ 973 lq_sta->missed_rate_counter++; 974 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) { 975 lq_sta->missed_rate_counter = 0; 976 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false); 977 } 978 /* Regardless, ignore this status info for outdated rate */ 979 return; 980 } else 981 /* Rate did match, so reset the missed_rate_counter */ 982 lq_sta->missed_rate_counter = 0; 983 984 /* Figure out if rate scale algorithm is in active or search table */ 985 if (table_type_matches(&tbl_type, 986 &(lq_sta->lq_info[lq_sta->active_tbl]))) { 987 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 988 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 989 } else if (table_type_matches(&tbl_type, 990 &lq_sta->lq_info[1 - lq_sta->active_tbl])) { 991 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 992 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 993 } else { 994 IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n"); 995 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 996 IWL_DEBUG_RATE(priv, "active- lq:%x, ant:%x, SGI:%d\n", 997 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI); 998 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 999 IWL_DEBUG_RATE(priv, "search- lq:%x, ant:%x, SGI:%d\n", 1000 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI); 1001 IWL_DEBUG_RATE(priv, "actual- lq:%x, ant:%x, SGI:%d\n", 1002 tbl_type.lq_type, tbl_type.ant_type, tbl_type.is_SGI); 1003 /* 1004 * no matching table found, let's by-pass the data collection 1005 * and continue to perform rate scale to find the rate table 1006 */ 1007 rs_stay_in_table(lq_sta, true); 1008 goto done; 1009 } 1010 1011 /* 1012 * Updating the frame history depends on whether packets were 1013 * aggregated. 1014 * 1015 * For aggregation, all packets were transmitted at the same rate, the 1016 * first index into rate scale table. 1017 */ 1018 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 1019 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags); 1020 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, 1021 &rs_index); 1022 rs_collect_tx_data(curr_tbl, rs_index, 1023 info->status.ampdu_len, 1024 info->status.ampdu_ack_len); 1025 1026 /* Update success/fail counts if not searching for new mode */ 1027 if (lq_sta->stay_in_tbl) { 1028 lq_sta->total_success += info->status.ampdu_ack_len; 1029 lq_sta->total_failed += (info->status.ampdu_len - 1030 info->status.ampdu_ack_len); 1031 } 1032 } else { 1033 /* 1034 * For legacy, update frame history with for each Tx retry. 1035 */ 1036 retries = info->status.rates[0].count - 1; 1037 /* HW doesn't send more than 15 retries */ 1038 retries = min(retries, 15); 1039 1040 /* The last transmission may have been successful */ 1041 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK); 1042 /* Collect data for each rate used during failed TX attempts */ 1043 for (i = 0; i <= retries; ++i) { 1044 tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags); 1045 rs_get_tbl_info_from_mcs(tx_rate, priv->band, 1046 &tbl_type, &rs_index); 1047 /* 1048 * Only collect stats if retried rate is in the same RS 1049 * table as active/search. 1050 */ 1051 if (table_type_matches(&tbl_type, curr_tbl)) 1052 tmp_tbl = curr_tbl; 1053 else if (table_type_matches(&tbl_type, other_tbl)) 1054 tmp_tbl = other_tbl; 1055 else 1056 continue; 1057 rs_collect_tx_data(tmp_tbl, rs_index, 1, 1058 i < retries ? 0 : legacy_success); 1059 } 1060 1061 /* Update success/fail counts if not searching for new mode */ 1062 if (lq_sta->stay_in_tbl) { 1063 lq_sta->total_success += legacy_success; 1064 lq_sta->total_failed += retries + (1 - legacy_success); 1065 } 1066 } 1067 /* The last TX rate is cached in lq_sta; it's set in if/else above */ 1068 lq_sta->last_rate_n_flags = tx_rate; 1069 done: 1070 /* See if there's a better rate or modulation mode to try. */ 1071 if (sta && sta->supp_rates[sband->band]) 1072 rs_rate_scale_perform(priv, skb, sta, lq_sta); 1073 1074 if (priv->lib->bt_params && priv->lib->bt_params->advanced_bt_coexist) 1075 rs_bt_update_lq(priv, ctx, lq_sta); 1076 } 1077 1078 /* 1079 * Begin a period of staying with a selected modulation mode. 1080 * Set "stay_in_tbl" flag to prevent any mode switches. 1081 * Set frame tx success limits according to legacy vs. high-throughput, 1082 * and reset overall (spanning all rates) tx success history statistics. 1083 * These control how long we stay using same modulation mode before 1084 * searching for a new mode. 1085 */ 1086 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy, 1087 struct iwl_lq_sta *lq_sta) 1088 { 1089 IWL_DEBUG_RATE(priv, "we are staying in the same table\n"); 1090 lq_sta->stay_in_tbl = 1; /* only place this gets set */ 1091 if (is_legacy) { 1092 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT; 1093 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT; 1094 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT; 1095 } else { 1096 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT; 1097 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT; 1098 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT; 1099 } 1100 lq_sta->table_count = 0; 1101 lq_sta->total_failed = 0; 1102 lq_sta->total_success = 0; 1103 lq_sta->flush_timer = jiffies; 1104 lq_sta->action_counter = 0; 1105 } 1106 1107 /* 1108 * Find correct throughput table for given mode of modulation 1109 */ 1110 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1111 struct iwl_scale_tbl_info *tbl) 1112 { 1113 /* Used to choose among HT tables */ 1114 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT]; 1115 1116 /* Check for invalid LQ type */ 1117 if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) { 1118 tbl->expected_tpt = expected_tpt_legacy; 1119 return; 1120 } 1121 1122 /* Legacy rates have only one table */ 1123 if (is_legacy(tbl->lq_type)) { 1124 tbl->expected_tpt = expected_tpt_legacy; 1125 return; 1126 } 1127 1128 /* Choose among many HT tables depending on number of streams 1129 * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation 1130 * status */ 1131 if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup)) 1132 ht_tbl_pointer = expected_tpt_siso20MHz; 1133 else if (is_siso(tbl->lq_type)) 1134 ht_tbl_pointer = expected_tpt_siso40MHz; 1135 else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup)) 1136 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1137 else if (is_mimo2(tbl->lq_type)) 1138 ht_tbl_pointer = expected_tpt_mimo2_40MHz; 1139 else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup)) 1140 ht_tbl_pointer = expected_tpt_mimo3_20MHz; 1141 else /* if (is_mimo3(tbl->lq_type)) <-- must be true */ 1142 ht_tbl_pointer = expected_tpt_mimo3_40MHz; 1143 1144 if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */ 1145 tbl->expected_tpt = ht_tbl_pointer[0]; 1146 else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */ 1147 tbl->expected_tpt = ht_tbl_pointer[1]; 1148 else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */ 1149 tbl->expected_tpt = ht_tbl_pointer[2]; 1150 else /* AGG+SGI */ 1151 tbl->expected_tpt = ht_tbl_pointer[3]; 1152 } 1153 1154 /* 1155 * Find starting rate for new "search" high-throughput mode of modulation. 1156 * Goal is to find lowest expected rate (under perfect conditions) that is 1157 * above the current measured throughput of "active" mode, to give new mode 1158 * a fair chance to prove itself without too many challenges. 1159 * 1160 * This gets called when transitioning to more aggressive modulation 1161 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive 1162 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need 1163 * to decrease to match "active" throughput. When moving from MIMO to SISO, 1164 * bit rate will typically need to increase, but not if performance was bad. 1165 */ 1166 static s32 rs_get_best_rate(struct iwl_priv *priv, 1167 struct iwl_lq_sta *lq_sta, 1168 struct iwl_scale_tbl_info *tbl, /* "search" */ 1169 u16 rate_mask, s8 index) 1170 { 1171 /* "active" values */ 1172 struct iwl_scale_tbl_info *active_tbl = 1173 &(lq_sta->lq_info[lq_sta->active_tbl]); 1174 s32 active_sr = active_tbl->win[index].success_ratio; 1175 s32 active_tpt = active_tbl->expected_tpt[index]; 1176 /* expected "search" throughput */ 1177 const u16 *tpt_tbl = tbl->expected_tpt; 1178 1179 s32 new_rate, high, low, start_hi; 1180 u16 high_low; 1181 s8 rate = index; 1182 1183 new_rate = high = low = start_hi = IWL_RATE_INVALID; 1184 1185 for (; ;) { 1186 high_low = rs_get_adjacent_rate(priv, rate, rate_mask, 1187 tbl->lq_type); 1188 1189 low = high_low & 0xff; 1190 high = (high_low >> 8) & 0xff; 1191 1192 /* 1193 * Lower the "search" bit rate, to give new "search" mode 1194 * approximately the same throughput as "active" if: 1195 * 1196 * 1) "Active" mode has been working modestly well (but not 1197 * great), and expected "search" throughput (under perfect 1198 * conditions) at candidate rate is above the actual 1199 * measured "active" throughput (but less than expected 1200 * "active" throughput under perfect conditions). 1201 * OR 1202 * 2) "Active" mode has been working perfectly or very well 1203 * and expected "search" throughput (under perfect 1204 * conditions) at candidate rate is above expected 1205 * "active" throughput (under perfect conditions). 1206 */ 1207 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) && 1208 ((active_sr > IWL_RATE_DECREASE_TH) && 1209 (active_sr <= IWL_RATE_HIGH_TH) && 1210 (tpt_tbl[rate] <= active_tpt))) || 1211 ((active_sr >= IWL_RATE_SCALE_SWITCH) && 1212 (tpt_tbl[rate] > active_tpt))) { 1213 1214 /* (2nd or later pass) 1215 * If we've already tried to raise the rate, and are 1216 * now trying to lower it, use the higher rate. */ 1217 if (start_hi != IWL_RATE_INVALID) { 1218 new_rate = start_hi; 1219 break; 1220 } 1221 1222 new_rate = rate; 1223 1224 /* Loop again with lower rate */ 1225 if (low != IWL_RATE_INVALID) 1226 rate = low; 1227 1228 /* Lower rate not available, use the original */ 1229 else 1230 break; 1231 1232 /* Else try to raise the "search" rate to match "active" */ 1233 } else { 1234 /* (2nd or later pass) 1235 * If we've already tried to lower the rate, and are 1236 * now trying to raise it, use the lower rate. */ 1237 if (new_rate != IWL_RATE_INVALID) 1238 break; 1239 1240 /* Loop again with higher rate */ 1241 else if (high != IWL_RATE_INVALID) { 1242 start_hi = high; 1243 rate = high; 1244 1245 /* Higher rate not available, use the original */ 1246 } else { 1247 new_rate = rate; 1248 break; 1249 } 1250 } 1251 } 1252 1253 return new_rate; 1254 } 1255 1256 /* 1257 * Set up search table for MIMO2 1258 */ 1259 static int rs_switch_to_mimo2(struct iwl_priv *priv, 1260 struct iwl_lq_sta *lq_sta, 1261 struct ieee80211_conf *conf, 1262 struct ieee80211_sta *sta, 1263 struct iwl_scale_tbl_info *tbl, int index) 1264 { 1265 u16 rate_mask; 1266 s32 rate; 1267 s8 is_green = lq_sta->is_green; 1268 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv; 1269 struct iwl_rxon_context *ctx = sta_priv->ctx; 1270 1271 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported) 1272 return -1; 1273 1274 if (sta->smps_mode == IEEE80211_SMPS_STATIC) 1275 return -1; 1276 1277 /* Need both Tx chains/antennas to support MIMO */ 1278 if (priv->hw_params.tx_chains_num < 2) 1279 return -1; 1280 1281 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n"); 1282 1283 tbl->lq_type = LQ_MIMO2; 1284 tbl->is_dup = lq_sta->is_dup; 1285 tbl->action = 0; 1286 tbl->max_search = IWL_MAX_SEARCH; 1287 rate_mask = lq_sta->active_mimo2_rate; 1288 1289 if (iwl_is_ht40_tx_allowed(priv, ctx, sta)) 1290 tbl->is_ht40 = 1; 1291 else 1292 tbl->is_ht40 = 0; 1293 1294 rs_set_expected_tpt_table(lq_sta, tbl); 1295 1296 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index); 1297 1298 IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask); 1299 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) { 1300 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n", 1301 rate, rate_mask); 1302 return -1; 1303 } 1304 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green); 1305 1306 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n", 1307 tbl->current_rate, is_green); 1308 return 0; 1309 } 1310 1311 /* 1312 * Set up search table for MIMO3 1313 */ 1314 static int rs_switch_to_mimo3(struct iwl_priv *priv, 1315 struct iwl_lq_sta *lq_sta, 1316 struct ieee80211_conf *conf, 1317 struct ieee80211_sta *sta, 1318 struct iwl_scale_tbl_info *tbl, int index) 1319 { 1320 u16 rate_mask; 1321 s32 rate; 1322 s8 is_green = lq_sta->is_green; 1323 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv; 1324 struct iwl_rxon_context *ctx = sta_priv->ctx; 1325 1326 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported) 1327 return -1; 1328 1329 if (sta->smps_mode == IEEE80211_SMPS_STATIC) 1330 return -1; 1331 1332 /* Need both Tx chains/antennas to support MIMO */ 1333 if (priv->hw_params.tx_chains_num < 3) 1334 return -1; 1335 1336 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n"); 1337 1338 tbl->lq_type = LQ_MIMO3; 1339 tbl->is_dup = lq_sta->is_dup; 1340 tbl->action = 0; 1341 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH; 1342 rate_mask = lq_sta->active_mimo3_rate; 1343 1344 if (iwl_is_ht40_tx_allowed(priv, ctx, sta)) 1345 tbl->is_ht40 = 1; 1346 else 1347 tbl->is_ht40 = 0; 1348 1349 rs_set_expected_tpt_table(lq_sta, tbl); 1350 1351 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index); 1352 1353 IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n", 1354 rate, rate_mask); 1355 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) { 1356 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n", 1357 rate, rate_mask); 1358 return -1; 1359 } 1360 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green); 1361 1362 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n", 1363 tbl->current_rate, is_green); 1364 return 0; 1365 } 1366 1367 /* 1368 * Set up search table for SISO 1369 */ 1370 static int rs_switch_to_siso(struct iwl_priv *priv, 1371 struct iwl_lq_sta *lq_sta, 1372 struct ieee80211_conf *conf, 1373 struct ieee80211_sta *sta, 1374 struct iwl_scale_tbl_info *tbl, int index) 1375 { 1376 u16 rate_mask; 1377 u8 is_green = lq_sta->is_green; 1378 s32 rate; 1379 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv; 1380 struct iwl_rxon_context *ctx = sta_priv->ctx; 1381 1382 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported) 1383 return -1; 1384 1385 IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n"); 1386 1387 tbl->is_dup = lq_sta->is_dup; 1388 tbl->lq_type = LQ_SISO; 1389 tbl->action = 0; 1390 tbl->max_search = IWL_MAX_SEARCH; 1391 rate_mask = lq_sta->active_siso_rate; 1392 1393 if (iwl_is_ht40_tx_allowed(priv, ctx, sta)) 1394 tbl->is_ht40 = 1; 1395 else 1396 tbl->is_ht40 = 0; 1397 1398 if (is_green) 1399 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/ 1400 1401 rs_set_expected_tpt_table(lq_sta, tbl); 1402 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index); 1403 1404 IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask); 1405 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) { 1406 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n", 1407 rate, rate_mask); 1408 return -1; 1409 } 1410 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green); 1411 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n", 1412 tbl->current_rate, is_green); 1413 return 0; 1414 } 1415 1416 /* 1417 * Try to switch to new modulation mode from legacy 1418 */ 1419 static void rs_move_legacy_other(struct iwl_priv *priv, 1420 struct iwl_lq_sta *lq_sta, 1421 struct ieee80211_conf *conf, 1422 struct ieee80211_sta *sta, 1423 int index) 1424 { 1425 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1426 struct iwl_scale_tbl_info *search_tbl = 1427 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 1428 struct iwl_rate_scale_data *window = &(tbl->win[index]); 1429 u32 sz = (sizeof(struct iwl_scale_tbl_info) - 1430 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); 1431 u8 start_action; 1432 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant; 1433 u8 tx_chains_num = priv->hw_params.tx_chains_num; 1434 int ret = 0; 1435 u8 update_search_tbl_counter = 0; 1436 1437 switch (priv->bt_traffic_load) { 1438 case IWL_BT_COEX_TRAFFIC_LOAD_NONE: 1439 /* nothing */ 1440 break; 1441 case IWL_BT_COEX_TRAFFIC_LOAD_LOW: 1442 /* avoid antenna B unless MIMO */ 1443 if (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2) 1444 tbl->action = IWL_LEGACY_SWITCH_SISO; 1445 break; 1446 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH: 1447 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS: 1448 /* avoid antenna B and MIMO */ 1449 valid_tx_ant = 1450 first_antenna(priv->nvm_data->valid_tx_ant); 1451 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2 && 1452 tbl->action != IWL_LEGACY_SWITCH_SISO) 1453 tbl->action = IWL_LEGACY_SWITCH_SISO; 1454 break; 1455 default: 1456 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load); 1457 break; 1458 } 1459 1460 if (!iwl_ht_enabled(priv)) 1461 /* stay in Legacy */ 1462 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1; 1463 else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE && 1464 tbl->action > IWL_LEGACY_SWITCH_SISO) 1465 tbl->action = IWL_LEGACY_SWITCH_SISO; 1466 1467 /* configure as 1x1 if bt full concurrency */ 1468 if (priv->bt_full_concurrent) { 1469 if (!iwl_ht_enabled(priv)) 1470 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1; 1471 else if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2) 1472 tbl->action = IWL_LEGACY_SWITCH_SISO; 1473 valid_tx_ant = 1474 first_antenna(priv->nvm_data->valid_tx_ant); 1475 } 1476 1477 start_action = tbl->action; 1478 for (; ;) { 1479 lq_sta->action_counter++; 1480 switch (tbl->action) { 1481 case IWL_LEGACY_SWITCH_ANTENNA1: 1482 case IWL_LEGACY_SWITCH_ANTENNA2: 1483 IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n"); 1484 1485 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 && 1486 tx_chains_num <= 1) || 1487 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 && 1488 tx_chains_num <= 2)) 1489 break; 1490 1491 /* Don't change antenna if success has been great */ 1492 if (window->success_ratio >= IWL_RS_GOOD_RATIO && 1493 !priv->bt_full_concurrent && 1494 priv->bt_traffic_load == 1495 IWL_BT_COEX_TRAFFIC_LOAD_NONE) 1496 break; 1497 1498 /* Set up search table to try other antenna */ 1499 memcpy(search_tbl, tbl, sz); 1500 1501 if (rs_toggle_antenna(valid_tx_ant, 1502 &search_tbl->current_rate, search_tbl)) { 1503 update_search_tbl_counter = 1; 1504 rs_set_expected_tpt_table(lq_sta, search_tbl); 1505 goto out; 1506 } 1507 break; 1508 case IWL_LEGACY_SWITCH_SISO: 1509 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n"); 1510 1511 /* Set up search table to try SISO */ 1512 memcpy(search_tbl, tbl, sz); 1513 search_tbl->is_SGI = 0; 1514 ret = rs_switch_to_siso(priv, lq_sta, conf, sta, 1515 search_tbl, index); 1516 if (!ret) { 1517 lq_sta->action_counter = 0; 1518 goto out; 1519 } 1520 1521 break; 1522 case IWL_LEGACY_SWITCH_MIMO2_AB: 1523 case IWL_LEGACY_SWITCH_MIMO2_AC: 1524 case IWL_LEGACY_SWITCH_MIMO2_BC: 1525 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n"); 1526 1527 /* Set up search table to try MIMO */ 1528 memcpy(search_tbl, tbl, sz); 1529 search_tbl->is_SGI = 0; 1530 1531 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB) 1532 search_tbl->ant_type = ANT_AB; 1533 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC) 1534 search_tbl->ant_type = ANT_AC; 1535 else 1536 search_tbl->ant_type = ANT_BC; 1537 1538 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 1539 break; 1540 1541 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta, 1542 search_tbl, index); 1543 if (!ret) { 1544 lq_sta->action_counter = 0; 1545 goto out; 1546 } 1547 break; 1548 1549 case IWL_LEGACY_SWITCH_MIMO3_ABC: 1550 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n"); 1551 1552 /* Set up search table to try MIMO3 */ 1553 memcpy(search_tbl, tbl, sz); 1554 search_tbl->is_SGI = 0; 1555 1556 search_tbl->ant_type = ANT_ABC; 1557 1558 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 1559 break; 1560 1561 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta, 1562 search_tbl, index); 1563 if (!ret) { 1564 lq_sta->action_counter = 0; 1565 goto out; 1566 } 1567 break; 1568 } 1569 tbl->action++; 1570 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC) 1571 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1; 1572 1573 if (tbl->action == start_action) 1574 break; 1575 1576 } 1577 search_tbl->lq_type = LQ_NONE; 1578 return; 1579 1580 out: 1581 lq_sta->search_better_tbl = 1; 1582 tbl->action++; 1583 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC) 1584 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1; 1585 if (update_search_tbl_counter) 1586 search_tbl->action = tbl->action; 1587 } 1588 1589 /* 1590 * Try to switch to new modulation mode from SISO 1591 */ 1592 static void rs_move_siso_to_other(struct iwl_priv *priv, 1593 struct iwl_lq_sta *lq_sta, 1594 struct ieee80211_conf *conf, 1595 struct ieee80211_sta *sta, int index) 1596 { 1597 u8 is_green = lq_sta->is_green; 1598 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1599 struct iwl_scale_tbl_info *search_tbl = 1600 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 1601 struct iwl_rate_scale_data *window = &(tbl->win[index]); 1602 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 1603 u32 sz = (sizeof(struct iwl_scale_tbl_info) - 1604 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); 1605 u8 start_action; 1606 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant; 1607 u8 tx_chains_num = priv->hw_params.tx_chains_num; 1608 u8 update_search_tbl_counter = 0; 1609 int ret; 1610 1611 switch (priv->bt_traffic_load) { 1612 case IWL_BT_COEX_TRAFFIC_LOAD_NONE: 1613 /* nothing */ 1614 break; 1615 case IWL_BT_COEX_TRAFFIC_LOAD_LOW: 1616 /* avoid antenna B unless MIMO */ 1617 if (tbl->action == IWL_SISO_SWITCH_ANTENNA2) 1618 tbl->action = IWL_SISO_SWITCH_MIMO2_AB; 1619 break; 1620 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH: 1621 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS: 1622 /* avoid antenna B and MIMO */ 1623 valid_tx_ant = 1624 first_antenna(priv->nvm_data->valid_tx_ant); 1625 if (tbl->action != IWL_SISO_SWITCH_ANTENNA1) 1626 tbl->action = IWL_SISO_SWITCH_ANTENNA1; 1627 break; 1628 default: 1629 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load); 1630 break; 1631 } 1632 1633 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE && 1634 tbl->action > IWL_SISO_SWITCH_ANTENNA2) { 1635 /* stay in SISO */ 1636 tbl->action = IWL_SISO_SWITCH_ANTENNA1; 1637 } 1638 1639 /* configure as 1x1 if bt full concurrency */ 1640 if (priv->bt_full_concurrent) { 1641 valid_tx_ant = 1642 first_antenna(priv->nvm_data->valid_tx_ant); 1643 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2) 1644 tbl->action = IWL_SISO_SWITCH_ANTENNA1; 1645 } 1646 1647 start_action = tbl->action; 1648 for (;;) { 1649 lq_sta->action_counter++; 1650 switch (tbl->action) { 1651 case IWL_SISO_SWITCH_ANTENNA1: 1652 case IWL_SISO_SWITCH_ANTENNA2: 1653 IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n"); 1654 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 && 1655 tx_chains_num <= 1) || 1656 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 && 1657 tx_chains_num <= 2)) 1658 break; 1659 1660 if (window->success_ratio >= IWL_RS_GOOD_RATIO && 1661 !priv->bt_full_concurrent && 1662 priv->bt_traffic_load == 1663 IWL_BT_COEX_TRAFFIC_LOAD_NONE) 1664 break; 1665 1666 memcpy(search_tbl, tbl, sz); 1667 if (rs_toggle_antenna(valid_tx_ant, 1668 &search_tbl->current_rate, search_tbl)) { 1669 update_search_tbl_counter = 1; 1670 goto out; 1671 } 1672 break; 1673 case IWL_SISO_SWITCH_MIMO2_AB: 1674 case IWL_SISO_SWITCH_MIMO2_AC: 1675 case IWL_SISO_SWITCH_MIMO2_BC: 1676 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n"); 1677 memcpy(search_tbl, tbl, sz); 1678 search_tbl->is_SGI = 0; 1679 1680 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB) 1681 search_tbl->ant_type = ANT_AB; 1682 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC) 1683 search_tbl->ant_type = ANT_AC; 1684 else 1685 search_tbl->ant_type = ANT_BC; 1686 1687 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 1688 break; 1689 1690 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta, 1691 search_tbl, index); 1692 if (!ret) 1693 goto out; 1694 break; 1695 case IWL_SISO_SWITCH_GI: 1696 if (!tbl->is_ht40 && !(ht_cap->cap & 1697 IEEE80211_HT_CAP_SGI_20)) 1698 break; 1699 if (tbl->is_ht40 && !(ht_cap->cap & 1700 IEEE80211_HT_CAP_SGI_40)) 1701 break; 1702 1703 IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n"); 1704 1705 memcpy(search_tbl, tbl, sz); 1706 if (is_green) { 1707 if (!tbl->is_SGI) 1708 break; 1709 else 1710 IWL_ERR(priv, 1711 "SGI was set in GF+SISO\n"); 1712 } 1713 search_tbl->is_SGI = !tbl->is_SGI; 1714 rs_set_expected_tpt_table(lq_sta, search_tbl); 1715 if (tbl->is_SGI) { 1716 s32 tpt = lq_sta->last_tpt / 100; 1717 if (tpt >= search_tbl->expected_tpt[index]) 1718 break; 1719 } 1720 search_tbl->current_rate = 1721 rate_n_flags_from_tbl(priv, search_tbl, 1722 index, is_green); 1723 update_search_tbl_counter = 1; 1724 goto out; 1725 case IWL_SISO_SWITCH_MIMO3_ABC: 1726 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n"); 1727 memcpy(search_tbl, tbl, sz); 1728 search_tbl->is_SGI = 0; 1729 search_tbl->ant_type = ANT_ABC; 1730 1731 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 1732 break; 1733 1734 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta, 1735 search_tbl, index); 1736 if (!ret) 1737 goto out; 1738 break; 1739 } 1740 tbl->action++; 1741 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC) 1742 tbl->action = IWL_SISO_SWITCH_ANTENNA1; 1743 1744 if (tbl->action == start_action) 1745 break; 1746 } 1747 search_tbl->lq_type = LQ_NONE; 1748 return; 1749 1750 out: 1751 lq_sta->search_better_tbl = 1; 1752 tbl->action++; 1753 if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC) 1754 tbl->action = IWL_SISO_SWITCH_ANTENNA1; 1755 if (update_search_tbl_counter) 1756 search_tbl->action = tbl->action; 1757 } 1758 1759 /* 1760 * Try to switch to new modulation mode from MIMO2 1761 */ 1762 static void rs_move_mimo2_to_other(struct iwl_priv *priv, 1763 struct iwl_lq_sta *lq_sta, 1764 struct ieee80211_conf *conf, 1765 struct ieee80211_sta *sta, int index) 1766 { 1767 s8 is_green = lq_sta->is_green; 1768 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1769 struct iwl_scale_tbl_info *search_tbl = 1770 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 1771 struct iwl_rate_scale_data *window = &(tbl->win[index]); 1772 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 1773 u32 sz = (sizeof(struct iwl_scale_tbl_info) - 1774 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); 1775 u8 start_action; 1776 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant; 1777 u8 tx_chains_num = priv->hw_params.tx_chains_num; 1778 u8 update_search_tbl_counter = 0; 1779 int ret; 1780 1781 switch (priv->bt_traffic_load) { 1782 case IWL_BT_COEX_TRAFFIC_LOAD_NONE: 1783 /* nothing */ 1784 break; 1785 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH: 1786 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS: 1787 /* avoid antenna B and MIMO */ 1788 if (tbl->action != IWL_MIMO2_SWITCH_SISO_A) 1789 tbl->action = IWL_MIMO2_SWITCH_SISO_A; 1790 break; 1791 case IWL_BT_COEX_TRAFFIC_LOAD_LOW: 1792 /* avoid antenna B unless MIMO */ 1793 if (tbl->action == IWL_MIMO2_SWITCH_SISO_B || 1794 tbl->action == IWL_MIMO2_SWITCH_SISO_C) 1795 tbl->action = IWL_MIMO2_SWITCH_SISO_A; 1796 break; 1797 default: 1798 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load); 1799 break; 1800 } 1801 1802 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) && 1803 (tbl->action < IWL_MIMO2_SWITCH_SISO_A || 1804 tbl->action > IWL_MIMO2_SWITCH_SISO_C)) { 1805 /* switch in SISO */ 1806 tbl->action = IWL_MIMO2_SWITCH_SISO_A; 1807 } 1808 1809 /* configure as 1x1 if bt full concurrency */ 1810 if (priv->bt_full_concurrent && 1811 (tbl->action < IWL_MIMO2_SWITCH_SISO_A || 1812 tbl->action > IWL_MIMO2_SWITCH_SISO_C)) 1813 tbl->action = IWL_MIMO2_SWITCH_SISO_A; 1814 1815 start_action = tbl->action; 1816 for (;;) { 1817 lq_sta->action_counter++; 1818 switch (tbl->action) { 1819 case IWL_MIMO2_SWITCH_ANTENNA1: 1820 case IWL_MIMO2_SWITCH_ANTENNA2: 1821 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n"); 1822 1823 if (tx_chains_num <= 2) 1824 break; 1825 1826 if (window->success_ratio >= IWL_RS_GOOD_RATIO) 1827 break; 1828 1829 memcpy(search_tbl, tbl, sz); 1830 if (rs_toggle_antenna(valid_tx_ant, 1831 &search_tbl->current_rate, search_tbl)) { 1832 update_search_tbl_counter = 1; 1833 goto out; 1834 } 1835 break; 1836 case IWL_MIMO2_SWITCH_SISO_A: 1837 case IWL_MIMO2_SWITCH_SISO_B: 1838 case IWL_MIMO2_SWITCH_SISO_C: 1839 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n"); 1840 1841 /* Set up new search table for SISO */ 1842 memcpy(search_tbl, tbl, sz); 1843 1844 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A) 1845 search_tbl->ant_type = ANT_A; 1846 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B) 1847 search_tbl->ant_type = ANT_B; 1848 else 1849 search_tbl->ant_type = ANT_C; 1850 1851 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 1852 break; 1853 1854 ret = rs_switch_to_siso(priv, lq_sta, conf, sta, 1855 search_tbl, index); 1856 if (!ret) 1857 goto out; 1858 1859 break; 1860 1861 case IWL_MIMO2_SWITCH_GI: 1862 if (!tbl->is_ht40 && !(ht_cap->cap & 1863 IEEE80211_HT_CAP_SGI_20)) 1864 break; 1865 if (tbl->is_ht40 && !(ht_cap->cap & 1866 IEEE80211_HT_CAP_SGI_40)) 1867 break; 1868 1869 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n"); 1870 1871 /* Set up new search table for MIMO2 */ 1872 memcpy(search_tbl, tbl, sz); 1873 search_tbl->is_SGI = !tbl->is_SGI; 1874 rs_set_expected_tpt_table(lq_sta, search_tbl); 1875 /* 1876 * If active table already uses the fastest possible 1877 * modulation (dual stream with short guard interval), 1878 * and it's working well, there's no need to look 1879 * for a better type of modulation! 1880 */ 1881 if (tbl->is_SGI) { 1882 s32 tpt = lq_sta->last_tpt / 100; 1883 if (tpt >= search_tbl->expected_tpt[index]) 1884 break; 1885 } 1886 search_tbl->current_rate = 1887 rate_n_flags_from_tbl(priv, search_tbl, 1888 index, is_green); 1889 update_search_tbl_counter = 1; 1890 goto out; 1891 1892 case IWL_MIMO2_SWITCH_MIMO3_ABC: 1893 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n"); 1894 memcpy(search_tbl, tbl, sz); 1895 search_tbl->is_SGI = 0; 1896 search_tbl->ant_type = ANT_ABC; 1897 1898 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 1899 break; 1900 1901 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta, 1902 search_tbl, index); 1903 if (!ret) 1904 goto out; 1905 1906 break; 1907 } 1908 tbl->action++; 1909 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC) 1910 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1; 1911 1912 if (tbl->action == start_action) 1913 break; 1914 } 1915 search_tbl->lq_type = LQ_NONE; 1916 return; 1917 out: 1918 lq_sta->search_better_tbl = 1; 1919 tbl->action++; 1920 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC) 1921 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1; 1922 if (update_search_tbl_counter) 1923 search_tbl->action = tbl->action; 1924 1925 } 1926 1927 /* 1928 * Try to switch to new modulation mode from MIMO3 1929 */ 1930 static void rs_move_mimo3_to_other(struct iwl_priv *priv, 1931 struct iwl_lq_sta *lq_sta, 1932 struct ieee80211_conf *conf, 1933 struct ieee80211_sta *sta, int index) 1934 { 1935 s8 is_green = lq_sta->is_green; 1936 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1937 struct iwl_scale_tbl_info *search_tbl = 1938 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 1939 struct iwl_rate_scale_data *window = &(tbl->win[index]); 1940 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 1941 u32 sz = (sizeof(struct iwl_scale_tbl_info) - 1942 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); 1943 u8 start_action; 1944 u8 valid_tx_ant = priv->nvm_data->valid_tx_ant; 1945 u8 tx_chains_num = priv->hw_params.tx_chains_num; 1946 int ret; 1947 u8 update_search_tbl_counter = 0; 1948 1949 switch (priv->bt_traffic_load) { 1950 case IWL_BT_COEX_TRAFFIC_LOAD_NONE: 1951 /* nothing */ 1952 break; 1953 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH: 1954 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS: 1955 /* avoid antenna B and MIMO */ 1956 if (tbl->action != IWL_MIMO3_SWITCH_SISO_A) 1957 tbl->action = IWL_MIMO3_SWITCH_SISO_A; 1958 break; 1959 case IWL_BT_COEX_TRAFFIC_LOAD_LOW: 1960 /* avoid antenna B unless MIMO */ 1961 if (tbl->action == IWL_MIMO3_SWITCH_SISO_B || 1962 tbl->action == IWL_MIMO3_SWITCH_SISO_C) 1963 tbl->action = IWL_MIMO3_SWITCH_SISO_A; 1964 break; 1965 default: 1966 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load); 1967 break; 1968 } 1969 1970 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) && 1971 (tbl->action < IWL_MIMO3_SWITCH_SISO_A || 1972 tbl->action > IWL_MIMO3_SWITCH_SISO_C)) { 1973 /* switch in SISO */ 1974 tbl->action = IWL_MIMO3_SWITCH_SISO_A; 1975 } 1976 1977 /* configure as 1x1 if bt full concurrency */ 1978 if (priv->bt_full_concurrent && 1979 (tbl->action < IWL_MIMO3_SWITCH_SISO_A || 1980 tbl->action > IWL_MIMO3_SWITCH_SISO_C)) 1981 tbl->action = IWL_MIMO3_SWITCH_SISO_A; 1982 1983 start_action = tbl->action; 1984 for (;;) { 1985 lq_sta->action_counter++; 1986 switch (tbl->action) { 1987 case IWL_MIMO3_SWITCH_ANTENNA1: 1988 case IWL_MIMO3_SWITCH_ANTENNA2: 1989 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n"); 1990 1991 if (tx_chains_num <= 3) 1992 break; 1993 1994 if (window->success_ratio >= IWL_RS_GOOD_RATIO) 1995 break; 1996 1997 memcpy(search_tbl, tbl, sz); 1998 if (rs_toggle_antenna(valid_tx_ant, 1999 &search_tbl->current_rate, search_tbl)) 2000 goto out; 2001 break; 2002 case IWL_MIMO3_SWITCH_SISO_A: 2003 case IWL_MIMO3_SWITCH_SISO_B: 2004 case IWL_MIMO3_SWITCH_SISO_C: 2005 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n"); 2006 2007 /* Set up new search table for SISO */ 2008 memcpy(search_tbl, tbl, sz); 2009 2010 if (tbl->action == IWL_MIMO3_SWITCH_SISO_A) 2011 search_tbl->ant_type = ANT_A; 2012 else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B) 2013 search_tbl->ant_type = ANT_B; 2014 else 2015 search_tbl->ant_type = ANT_C; 2016 2017 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 2018 break; 2019 2020 ret = rs_switch_to_siso(priv, lq_sta, conf, sta, 2021 search_tbl, index); 2022 if (!ret) 2023 goto out; 2024 2025 break; 2026 2027 case IWL_MIMO3_SWITCH_MIMO2_AB: 2028 case IWL_MIMO3_SWITCH_MIMO2_AC: 2029 case IWL_MIMO3_SWITCH_MIMO2_BC: 2030 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n"); 2031 2032 memcpy(search_tbl, tbl, sz); 2033 search_tbl->is_SGI = 0; 2034 if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB) 2035 search_tbl->ant_type = ANT_AB; 2036 else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC) 2037 search_tbl->ant_type = ANT_AC; 2038 else 2039 search_tbl->ant_type = ANT_BC; 2040 2041 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) 2042 break; 2043 2044 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta, 2045 search_tbl, index); 2046 if (!ret) 2047 goto out; 2048 2049 break; 2050 2051 case IWL_MIMO3_SWITCH_GI: 2052 if (!tbl->is_ht40 && !(ht_cap->cap & 2053 IEEE80211_HT_CAP_SGI_20)) 2054 break; 2055 if (tbl->is_ht40 && !(ht_cap->cap & 2056 IEEE80211_HT_CAP_SGI_40)) 2057 break; 2058 2059 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n"); 2060 2061 /* Set up new search table for MIMO */ 2062 memcpy(search_tbl, tbl, sz); 2063 search_tbl->is_SGI = !tbl->is_SGI; 2064 rs_set_expected_tpt_table(lq_sta, search_tbl); 2065 /* 2066 * If active table already uses the fastest possible 2067 * modulation (dual stream with short guard interval), 2068 * and it's working well, there's no need to look 2069 * for a better type of modulation! 2070 */ 2071 if (tbl->is_SGI) { 2072 s32 tpt = lq_sta->last_tpt / 100; 2073 if (tpt >= search_tbl->expected_tpt[index]) 2074 break; 2075 } 2076 search_tbl->current_rate = 2077 rate_n_flags_from_tbl(priv, search_tbl, 2078 index, is_green); 2079 update_search_tbl_counter = 1; 2080 goto out; 2081 } 2082 tbl->action++; 2083 if (tbl->action > IWL_MIMO3_SWITCH_GI) 2084 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1; 2085 2086 if (tbl->action == start_action) 2087 break; 2088 } 2089 search_tbl->lq_type = LQ_NONE; 2090 return; 2091 out: 2092 lq_sta->search_better_tbl = 1; 2093 tbl->action++; 2094 if (tbl->action > IWL_MIMO3_SWITCH_GI) 2095 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1; 2096 if (update_search_tbl_counter) 2097 search_tbl->action = tbl->action; 2098 } 2099 2100 /* 2101 * Check whether we should continue using same modulation mode, or 2102 * begin search for a new mode, based on: 2103 * 1) # tx successes or failures while using this mode 2104 * 2) # times calling this function 2105 * 3) elapsed time in this mode (not used, for now) 2106 */ 2107 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search) 2108 { 2109 struct iwl_scale_tbl_info *tbl; 2110 int i; 2111 int active_tbl; 2112 int flush_interval_passed = 0; 2113 struct iwl_priv *priv; 2114 2115 priv = lq_sta->drv; 2116 active_tbl = lq_sta->active_tbl; 2117 2118 tbl = &(lq_sta->lq_info[active_tbl]); 2119 2120 /* If we've been disallowing search, see if we should now allow it */ 2121 if (lq_sta->stay_in_tbl) { 2122 2123 /* Elapsed time using current modulation mode */ 2124 if (lq_sta->flush_timer) 2125 flush_interval_passed = 2126 time_after(jiffies, 2127 (unsigned long)(lq_sta->flush_timer + 2128 IWL_RATE_SCALE_FLUSH_INTVL)); 2129 2130 /* 2131 * Check if we should allow search for new modulation mode. 2132 * If many frames have failed or succeeded, or we've used 2133 * this same modulation for a long time, allow search, and 2134 * reset history stats that keep track of whether we should 2135 * allow a new search. Also (below) reset all bitmaps and 2136 * stats in active history. 2137 */ 2138 if (force_search || 2139 (lq_sta->total_failed > lq_sta->max_failure_limit) || 2140 (lq_sta->total_success > lq_sta->max_success_limit) || 2141 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer) 2142 && (flush_interval_passed))) { 2143 IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n", 2144 lq_sta->total_failed, 2145 lq_sta->total_success, 2146 flush_interval_passed); 2147 2148 /* Allow search for new mode */ 2149 lq_sta->stay_in_tbl = 0; /* only place reset */ 2150 lq_sta->total_failed = 0; 2151 lq_sta->total_success = 0; 2152 lq_sta->flush_timer = 0; 2153 2154 /* 2155 * Else if we've used this modulation mode enough repetitions 2156 * (regardless of elapsed time or success/failure), reset 2157 * history bitmaps and rate-specific stats for all rates in 2158 * active table. 2159 */ 2160 } else { 2161 lq_sta->table_count++; 2162 if (lq_sta->table_count >= 2163 lq_sta->table_count_limit) { 2164 lq_sta->table_count = 0; 2165 2166 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n"); 2167 for (i = 0; i < IWL_RATE_COUNT; i++) 2168 rs_rate_scale_clear_window( 2169 &(tbl->win[i])); 2170 } 2171 } 2172 2173 /* If transitioning to allow "search", reset all history 2174 * bitmaps and stats in active table (this will become the new 2175 * "search" table). */ 2176 if (!lq_sta->stay_in_tbl) { 2177 for (i = 0; i < IWL_RATE_COUNT; i++) 2178 rs_rate_scale_clear_window(&(tbl->win[i])); 2179 } 2180 } 2181 } 2182 2183 /* 2184 * setup rate table in uCode 2185 */ 2186 static void rs_update_rate_tbl(struct iwl_priv *priv, 2187 struct iwl_rxon_context *ctx, 2188 struct iwl_lq_sta *lq_sta, 2189 struct iwl_scale_tbl_info *tbl, 2190 int index, u8 is_green) 2191 { 2192 u32 rate; 2193 2194 /* Update uCode's rate table. */ 2195 rate = rate_n_flags_from_tbl(priv, tbl, index, is_green); 2196 rs_fill_link_cmd(priv, lq_sta, rate); 2197 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false); 2198 } 2199 2200 /* 2201 * Do rate scaling and search for new modulation mode. 2202 */ 2203 static void rs_rate_scale_perform(struct iwl_priv *priv, 2204 struct sk_buff *skb, 2205 struct ieee80211_sta *sta, 2206 struct iwl_lq_sta *lq_sta) 2207 { 2208 struct ieee80211_hw *hw = priv->hw; 2209 struct ieee80211_conf *conf = &hw->conf; 2210 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2211 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 2212 int low = IWL_RATE_INVALID; 2213 int high = IWL_RATE_INVALID; 2214 int index; 2215 int i; 2216 struct iwl_rate_scale_data *window = NULL; 2217 int current_tpt = IWL_INVALID_VALUE; 2218 int low_tpt = IWL_INVALID_VALUE; 2219 int high_tpt = IWL_INVALID_VALUE; 2220 u32 fail_count; 2221 s8 scale_action = 0; 2222 u16 rate_mask; 2223 u8 update_lq = 0; 2224 struct iwl_scale_tbl_info *tbl, *tbl1; 2225 u16 rate_scale_index_msk = 0; 2226 u8 is_green = 0; 2227 u8 active_tbl = 0; 2228 u8 done_search = 0; 2229 u16 high_low; 2230 s32 sr; 2231 u8 tid = IWL_MAX_TID_COUNT; 2232 struct iwl_tid_data *tid_data; 2233 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv; 2234 struct iwl_rxon_context *ctx = sta_priv->ctx; 2235 2236 IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n"); 2237 2238 /* Send management frames and NO_ACK data using lowest rate. */ 2239 /* TODO: this could probably be improved.. */ 2240 if (!ieee80211_is_data(hdr->frame_control) || 2241 info->flags & IEEE80211_TX_CTL_NO_ACK) 2242 return; 2243 2244 lq_sta->supp_rates = sta->supp_rates[lq_sta->band]; 2245 2246 tid = rs_tl_add_packet(lq_sta, hdr); 2247 if ((tid != IWL_MAX_TID_COUNT) && 2248 (lq_sta->tx_agg_tid_en & (1 << tid))) { 2249 tid_data = &priv->tid_data[lq_sta->lq.sta_id][tid]; 2250 if (tid_data->agg.state == IWL_AGG_OFF) 2251 lq_sta->is_agg = 0; 2252 else 2253 lq_sta->is_agg = 1; 2254 } else 2255 lq_sta->is_agg = 0; 2256 2257 /* 2258 * Select rate-scale / modulation-mode table to work with in 2259 * the rest of this function: "search" if searching for better 2260 * modulation mode, or "active" if doing rate scaling within a mode. 2261 */ 2262 if (!lq_sta->search_better_tbl) 2263 active_tbl = lq_sta->active_tbl; 2264 else 2265 active_tbl = 1 - lq_sta->active_tbl; 2266 2267 tbl = &(lq_sta->lq_info[active_tbl]); 2268 if (is_legacy(tbl->lq_type)) 2269 lq_sta->is_green = 0; 2270 else 2271 lq_sta->is_green = rs_use_green(sta); 2272 is_green = lq_sta->is_green; 2273 2274 /* current tx rate */ 2275 index = lq_sta->last_txrate_idx; 2276 2277 IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index, 2278 tbl->lq_type); 2279 2280 /* rates available for this association, and for modulation mode */ 2281 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type); 2282 2283 IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask); 2284 2285 /* mask with station rate restriction */ 2286 if (is_legacy(tbl->lq_type)) { 2287 if (lq_sta->band == NL80211_BAND_5GHZ) 2288 /* supp_rates has no CCK bits in A mode */ 2289 rate_scale_index_msk = (u16) (rate_mask & 2290 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE)); 2291 else 2292 rate_scale_index_msk = (u16) (rate_mask & 2293 lq_sta->supp_rates); 2294 2295 } else 2296 rate_scale_index_msk = rate_mask; 2297 2298 if (!rate_scale_index_msk) 2299 rate_scale_index_msk = rate_mask; 2300 2301 if (!((1 << index) & rate_scale_index_msk)) { 2302 IWL_ERR(priv, "Current Rate is not valid\n"); 2303 if (lq_sta->search_better_tbl) { 2304 /* revert to active table if search table is not valid*/ 2305 tbl->lq_type = LQ_NONE; 2306 lq_sta->search_better_tbl = 0; 2307 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 2308 /* get "active" rate info */ 2309 index = iwl_hwrate_to_plcp_idx(tbl->current_rate); 2310 rs_update_rate_tbl(priv, ctx, lq_sta, tbl, 2311 index, is_green); 2312 } 2313 return; 2314 } 2315 2316 /* Get expected throughput table and history window for current rate */ 2317 if (!tbl->expected_tpt) { 2318 IWL_ERR(priv, "tbl->expected_tpt is NULL\n"); 2319 return; 2320 } 2321 2322 /* force user max rate if set by user */ 2323 if ((lq_sta->max_rate_idx != -1) && 2324 (lq_sta->max_rate_idx < index)) { 2325 index = lq_sta->max_rate_idx; 2326 update_lq = 1; 2327 window = &(tbl->win[index]); 2328 goto lq_update; 2329 } 2330 2331 window = &(tbl->win[index]); 2332 2333 /* 2334 * If there is not enough history to calculate actual average 2335 * throughput, keep analyzing results of more tx frames, without 2336 * changing rate or mode (bypass most of the rest of this function). 2337 * Set up new rate table in uCode only if old rate is not supported 2338 * in current association (use new rate found above). 2339 */ 2340 fail_count = window->counter - window->success_counter; 2341 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) && 2342 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) { 2343 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d " 2344 "for index %d\n", 2345 window->success_counter, window->counter, index); 2346 2347 /* Can't calculate this yet; not enough history */ 2348 window->average_tpt = IWL_INVALID_VALUE; 2349 2350 /* Should we stay with this modulation mode, 2351 * or search for a new one? */ 2352 rs_stay_in_table(lq_sta, false); 2353 2354 goto out; 2355 } 2356 /* Else we have enough samples; calculate estimate of 2357 * actual average throughput */ 2358 if (window->average_tpt != ((window->success_ratio * 2359 tbl->expected_tpt[index] + 64) / 128)) { 2360 IWL_ERR(priv, "expected_tpt should have been calculated by now\n"); 2361 window->average_tpt = ((window->success_ratio * 2362 tbl->expected_tpt[index] + 64) / 128); 2363 } 2364 2365 /* If we are searching for better modulation mode, check success. */ 2366 if (lq_sta->search_better_tbl && 2367 (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) { 2368 /* If good success, continue using the "search" mode; 2369 * no need to send new link quality command, since we're 2370 * continuing to use the setup that we've been trying. */ 2371 if (window->average_tpt > lq_sta->last_tpt) { 2372 2373 IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE " 2374 "suc=%d cur-tpt=%d old-tpt=%d\n", 2375 window->success_ratio, 2376 window->average_tpt, 2377 lq_sta->last_tpt); 2378 2379 if (!is_legacy(tbl->lq_type)) 2380 lq_sta->enable_counter = 1; 2381 2382 /* Swap tables; "search" becomes "active" */ 2383 lq_sta->active_tbl = active_tbl; 2384 current_tpt = window->average_tpt; 2385 2386 /* Else poor success; go back to mode in "active" table */ 2387 } else { 2388 2389 IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE " 2390 "suc=%d cur-tpt=%d old-tpt=%d\n", 2391 window->success_ratio, 2392 window->average_tpt, 2393 lq_sta->last_tpt); 2394 2395 /* Nullify "search" table */ 2396 tbl->lq_type = LQ_NONE; 2397 2398 /* Revert to "active" table */ 2399 active_tbl = lq_sta->active_tbl; 2400 tbl = &(lq_sta->lq_info[active_tbl]); 2401 2402 /* Revert to "active" rate and throughput info */ 2403 index = iwl_hwrate_to_plcp_idx(tbl->current_rate); 2404 current_tpt = lq_sta->last_tpt; 2405 2406 /* Need to set up a new rate table in uCode */ 2407 update_lq = 1; 2408 } 2409 2410 /* Either way, we've made a decision; modulation mode 2411 * search is done, allow rate adjustment next time. */ 2412 lq_sta->search_better_tbl = 0; 2413 done_search = 1; /* Don't switch modes below! */ 2414 goto lq_update; 2415 } 2416 2417 /* (Else) not in search of better modulation mode, try for better 2418 * starting rate, while staying in this mode. */ 2419 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk, 2420 tbl->lq_type); 2421 low = high_low & 0xff; 2422 high = (high_low >> 8) & 0xff; 2423 2424 /* If user set max rate, dont allow higher than user constrain */ 2425 if ((lq_sta->max_rate_idx != -1) && 2426 (lq_sta->max_rate_idx < high)) 2427 high = IWL_RATE_INVALID; 2428 2429 sr = window->success_ratio; 2430 2431 /* Collect measured throughputs for current and adjacent rates */ 2432 current_tpt = window->average_tpt; 2433 if (low != IWL_RATE_INVALID) 2434 low_tpt = tbl->win[low].average_tpt; 2435 if (high != IWL_RATE_INVALID) 2436 high_tpt = tbl->win[high].average_tpt; 2437 2438 scale_action = 0; 2439 2440 /* Too many failures, decrease rate */ 2441 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) { 2442 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n"); 2443 scale_action = -1; 2444 2445 /* No throughput measured yet for adjacent rates; try increase. */ 2446 } else if ((low_tpt == IWL_INVALID_VALUE) && 2447 (high_tpt == IWL_INVALID_VALUE)) { 2448 2449 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH) 2450 scale_action = 1; 2451 else if (low != IWL_RATE_INVALID) 2452 scale_action = 0; 2453 } 2454 2455 /* Both adjacent throughputs are measured, but neither one has better 2456 * throughput; we're using the best rate, don't change it! */ 2457 else if ((low_tpt != IWL_INVALID_VALUE) && 2458 (high_tpt != IWL_INVALID_VALUE) && 2459 (low_tpt < current_tpt) && 2460 (high_tpt < current_tpt)) 2461 scale_action = 0; 2462 2463 /* At least one adjacent rate's throughput is measured, 2464 * and may have better performance. */ 2465 else { 2466 /* Higher adjacent rate's throughput is measured */ 2467 if (high_tpt != IWL_INVALID_VALUE) { 2468 /* Higher rate has better throughput */ 2469 if (high_tpt > current_tpt && 2470 sr >= IWL_RATE_INCREASE_TH) { 2471 scale_action = 1; 2472 } else { 2473 scale_action = 0; 2474 } 2475 2476 /* Lower adjacent rate's throughput is measured */ 2477 } else if (low_tpt != IWL_INVALID_VALUE) { 2478 /* Lower rate has better throughput */ 2479 if (low_tpt > current_tpt) { 2480 IWL_DEBUG_RATE(priv, 2481 "decrease rate because of low tpt\n"); 2482 scale_action = -1; 2483 } else if (sr >= IWL_RATE_INCREASE_TH) { 2484 scale_action = 1; 2485 } 2486 } 2487 } 2488 2489 /* Sanity check; asked for decrease, but success rate or throughput 2490 * has been good at old rate. Don't change it. */ 2491 if ((scale_action == -1) && (low != IWL_RATE_INVALID) && 2492 ((sr > IWL_RATE_HIGH_TH) || 2493 (current_tpt > (100 * tbl->expected_tpt[low])))) 2494 scale_action = 0; 2495 if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type)) 2496 scale_action = -1; 2497 if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI && 2498 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) 2499 scale_action = -1; 2500 2501 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) && 2502 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) { 2503 if (lq_sta->last_bt_traffic > priv->bt_traffic_load) { 2504 /* 2505 * don't set scale_action, don't want to scale up if 2506 * the rate scale doesn't otherwise think that is a 2507 * good idea. 2508 */ 2509 } else if (lq_sta->last_bt_traffic <= priv->bt_traffic_load) { 2510 scale_action = -1; 2511 } 2512 } 2513 lq_sta->last_bt_traffic = priv->bt_traffic_load; 2514 2515 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) && 2516 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) { 2517 /* search for a new modulation */ 2518 rs_stay_in_table(lq_sta, true); 2519 goto lq_update; 2520 } 2521 2522 switch (scale_action) { 2523 case -1: 2524 /* Decrease starting rate, update uCode's rate table */ 2525 if (low != IWL_RATE_INVALID) { 2526 update_lq = 1; 2527 index = low; 2528 } 2529 2530 break; 2531 case 1: 2532 /* Increase starting rate, update uCode's rate table */ 2533 if (high != IWL_RATE_INVALID) { 2534 update_lq = 1; 2535 index = high; 2536 } 2537 2538 break; 2539 case 0: 2540 /* No change */ 2541 default: 2542 break; 2543 } 2544 2545 IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d " 2546 "high %d type %d\n", 2547 index, scale_action, low, high, tbl->lq_type); 2548 2549 lq_update: 2550 /* Replace uCode's rate table for the destination station. */ 2551 if (update_lq) 2552 rs_update_rate_tbl(priv, ctx, lq_sta, tbl, index, is_green); 2553 2554 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) { 2555 /* Should we stay with this modulation mode, 2556 * or search for a new one? */ 2557 rs_stay_in_table(lq_sta, false); 2558 } 2559 /* 2560 * Search for new modulation mode if we're: 2561 * 1) Not changing rates right now 2562 * 2) Not just finishing up a search 2563 * 3) Allowing a new search 2564 */ 2565 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) { 2566 /* Save current throughput to compare with "search" throughput*/ 2567 lq_sta->last_tpt = current_tpt; 2568 2569 /* Select a new "search" modulation mode to try. 2570 * If one is found, set up the new "search" table. */ 2571 if (is_legacy(tbl->lq_type)) 2572 rs_move_legacy_other(priv, lq_sta, conf, sta, index); 2573 else if (is_siso(tbl->lq_type)) 2574 rs_move_siso_to_other(priv, lq_sta, conf, sta, index); 2575 else if (is_mimo2(tbl->lq_type)) 2576 rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index); 2577 else 2578 rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index); 2579 2580 /* If new "search" mode was selected, set up in uCode table */ 2581 if (lq_sta->search_better_tbl) { 2582 /* Access the "search" table, clear its history. */ 2583 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 2584 for (i = 0; i < IWL_RATE_COUNT; i++) 2585 rs_rate_scale_clear_window(&(tbl->win[i])); 2586 2587 /* Use new "search" start rate */ 2588 index = iwl_hwrate_to_plcp_idx(tbl->current_rate); 2589 2590 IWL_DEBUG_RATE(priv, "Switch current mcs: %X index: %d\n", 2591 tbl->current_rate, index); 2592 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate); 2593 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false); 2594 } else 2595 done_search = 1; 2596 } 2597 2598 if (done_search && !lq_sta->stay_in_tbl) { 2599 /* If the "active" (non-search) mode was legacy, 2600 * and we've tried switching antennas, 2601 * but we haven't been able to try HT modes (not available), 2602 * stay with best antenna legacy modulation for a while 2603 * before next round of mode comparisons. */ 2604 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]); 2605 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) && 2606 lq_sta->action_counter > tbl1->max_search) { 2607 IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n"); 2608 rs_set_stay_in_table(priv, 1, lq_sta); 2609 } 2610 2611 /* If we're in an HT mode, and all 3 mode switch actions 2612 * have been tried and compared, stay in this best modulation 2613 * mode for a while before next round of mode comparisons. */ 2614 if (lq_sta->enable_counter && 2615 (lq_sta->action_counter >= tbl1->max_search) && 2616 iwl_ht_enabled(priv)) { 2617 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) && 2618 (lq_sta->tx_agg_tid_en & (1 << tid)) && 2619 (tid != IWL_MAX_TID_COUNT)) { 2620 u8 sta_id = lq_sta->lq.sta_id; 2621 tid_data = &priv->tid_data[sta_id][tid]; 2622 if (tid_data->agg.state == IWL_AGG_OFF) { 2623 IWL_DEBUG_RATE(priv, 2624 "try to aggregate tid %d\n", 2625 tid); 2626 rs_tl_turn_on_agg(priv, tid, 2627 lq_sta, sta); 2628 } 2629 } 2630 rs_set_stay_in_table(priv, 0, lq_sta); 2631 } 2632 } 2633 2634 out: 2635 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green); 2636 lq_sta->last_txrate_idx = index; 2637 } 2638 2639 /** 2640 * rs_initialize_lq - Initialize a station's hardware rate table 2641 * 2642 * The uCode's station table contains a table of fallback rates 2643 * for automatic fallback during transmission. 2644 * 2645 * NOTE: This sets up a default set of values. These will be replaced later 2646 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of 2647 * rc80211_simple. 2648 * 2649 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before 2650 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD, 2651 * which requires station table entry to exist). 2652 */ 2653 static void rs_initialize_lq(struct iwl_priv *priv, 2654 struct ieee80211_sta *sta, 2655 struct iwl_lq_sta *lq_sta) 2656 { 2657 struct iwl_scale_tbl_info *tbl; 2658 int rate_idx; 2659 int i; 2660 u32 rate; 2661 u8 use_green = rs_use_green(sta); 2662 u8 active_tbl = 0; 2663 u8 valid_tx_ant; 2664 struct iwl_station_priv *sta_priv; 2665 struct iwl_rxon_context *ctx; 2666 2667 if (!sta || !lq_sta) 2668 return; 2669 2670 sta_priv = (void *)sta->drv_priv; 2671 ctx = sta_priv->ctx; 2672 2673 i = lq_sta->last_txrate_idx; 2674 2675 valid_tx_ant = priv->nvm_data->valid_tx_ant; 2676 2677 if (!lq_sta->search_better_tbl) 2678 active_tbl = lq_sta->active_tbl; 2679 else 2680 active_tbl = 1 - lq_sta->active_tbl; 2681 2682 tbl = &(lq_sta->lq_info[active_tbl]); 2683 2684 if ((i < 0) || (i >= IWL_RATE_COUNT)) 2685 i = 0; 2686 2687 rate = iwl_rates[i].plcp; 2688 tbl->ant_type = first_antenna(valid_tx_ant); 2689 rate |= tbl->ant_type << RATE_MCS_ANT_POS; 2690 2691 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE) 2692 rate |= RATE_MCS_CCK_MSK; 2693 2694 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx); 2695 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type)) 2696 rs_toggle_antenna(valid_tx_ant, &rate, tbl); 2697 2698 rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green); 2699 tbl->current_rate = rate; 2700 rs_set_expected_tpt_table(lq_sta, tbl); 2701 rs_fill_link_cmd(NULL, lq_sta, rate); 2702 priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq; 2703 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, 0, true); 2704 } 2705 2706 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta, 2707 struct ieee80211_tx_rate_control *txrc) 2708 { 2709 2710 struct sk_buff *skb = txrc->skb; 2711 struct ieee80211_supported_band *sband = txrc->sband; 2712 struct iwl_op_mode *op_mode __maybe_unused = 2713 (struct iwl_op_mode *)priv_r; 2714 struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode); 2715 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2716 struct iwl_lq_sta *lq_sta = priv_sta; 2717 int rate_idx; 2718 2719 IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n"); 2720 2721 /* Get max rate if user set max rate */ 2722 if (lq_sta) { 2723 lq_sta->max_rate_idx = txrc->max_rate_idx; 2724 if ((sband->band == NL80211_BAND_5GHZ) && 2725 (lq_sta->max_rate_idx != -1)) 2726 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE; 2727 if ((lq_sta->max_rate_idx < 0) || 2728 (lq_sta->max_rate_idx >= IWL_RATE_COUNT)) 2729 lq_sta->max_rate_idx = -1; 2730 } 2731 2732 /* Treat uninitialized rate scaling data same as non-existing. */ 2733 if (lq_sta && !lq_sta->drv) { 2734 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n"); 2735 priv_sta = NULL; 2736 } 2737 2738 /* Send management frames and NO_ACK data using lowest rate. */ 2739 if (rate_control_send_low(sta, priv_sta, txrc)) 2740 return; 2741 2742 rate_idx = lq_sta->last_txrate_idx; 2743 2744 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) { 2745 rate_idx -= IWL_FIRST_OFDM_RATE; 2746 /* 6M and 9M shared same MCS index */ 2747 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0; 2748 if (rs_extract_rate(lq_sta->last_rate_n_flags) >= 2749 IWL_RATE_MIMO3_6M_PLCP) 2750 rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM); 2751 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >= 2752 IWL_RATE_MIMO2_6M_PLCP) 2753 rate_idx = rate_idx + MCS_INDEX_PER_STREAM; 2754 info->control.rates[0].flags = IEEE80211_TX_RC_MCS; 2755 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK) 2756 info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI; 2757 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK) 2758 info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA; 2759 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK) 2760 info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2761 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK) 2762 info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD; 2763 } else { 2764 /* Check for invalid rates */ 2765 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) || 2766 ((sband->band == NL80211_BAND_5GHZ) && 2767 (rate_idx < IWL_FIRST_OFDM_RATE))) 2768 rate_idx = rate_lowest_index(sband, sta); 2769 /* On valid 5 GHz rate, adjust index */ 2770 else if (sband->band == NL80211_BAND_5GHZ) 2771 rate_idx -= IWL_FIRST_OFDM_RATE; 2772 info->control.rates[0].flags = 0; 2773 } 2774 info->control.rates[0].idx = rate_idx; 2775 info->control.rates[0].count = 1; 2776 } 2777 2778 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta, 2779 gfp_t gfp) 2780 { 2781 struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv; 2782 struct iwl_op_mode *op_mode __maybe_unused = 2783 (struct iwl_op_mode *)priv_rate; 2784 struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode); 2785 2786 IWL_DEBUG_RATE(priv, "create station rate scale window\n"); 2787 2788 return &sta_priv->lq_sta; 2789 } 2790 2791 /* 2792 * Called after adding a new station to initialize rate scaling 2793 */ 2794 void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id) 2795 { 2796 int i, j; 2797 struct ieee80211_hw *hw = priv->hw; 2798 struct ieee80211_conf *conf = &priv->hw->conf; 2799 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 2800 struct iwl_station_priv *sta_priv; 2801 struct iwl_lq_sta *lq_sta; 2802 struct ieee80211_supported_band *sband; 2803 unsigned long supp; /* must be unsigned long for for_each_set_bit */ 2804 2805 sta_priv = (struct iwl_station_priv *) sta->drv_priv; 2806 lq_sta = &sta_priv->lq_sta; 2807 sband = hw->wiphy->bands[conf->chandef.chan->band]; 2808 2809 2810 lq_sta->lq.sta_id = sta_id; 2811 2812 for (j = 0; j < LQ_SIZE; j++) 2813 for (i = 0; i < IWL_RATE_COUNT; i++) 2814 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]); 2815 2816 lq_sta->flush_timer = 0; 2817 lq_sta->supp_rates = sta->supp_rates[sband->band]; 2818 2819 IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n", 2820 sta_id); 2821 /* TODO: what is a good starting rate for STA? About middle? Maybe not 2822 * the lowest or the highest rate.. Could consider using RSSI from 2823 * previous packets? Need to have IEEE 802.1X auth succeed immediately 2824 * after assoc.. */ 2825 2826 lq_sta->is_dup = 0; 2827 lq_sta->max_rate_idx = -1; 2828 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX; 2829 lq_sta->is_green = rs_use_green(sta); 2830 lq_sta->band = sband->band; 2831 /* 2832 * active legacy rates as per supported rates bitmap 2833 */ 2834 supp = sta->supp_rates[sband->band]; 2835 lq_sta->active_legacy_rate = 0; 2836 for_each_set_bit(i, &supp, BITS_PER_LONG) 2837 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value); 2838 2839 /* 2840 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3), 2841 * supp_rates[] does not; shift to convert format, force 9 MBits off. 2842 */ 2843 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1; 2844 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1; 2845 lq_sta->active_siso_rate &= ~((u16)0x2); 2846 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE; 2847 2848 /* Same here */ 2849 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1; 2850 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1; 2851 lq_sta->active_mimo2_rate &= ~((u16)0x2); 2852 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE; 2853 2854 lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1; 2855 lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1; 2856 lq_sta->active_mimo3_rate &= ~((u16)0x2); 2857 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE; 2858 2859 IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n", 2860 lq_sta->active_siso_rate, 2861 lq_sta->active_mimo2_rate, 2862 lq_sta->active_mimo3_rate); 2863 2864 /* These values will be overridden later */ 2865 lq_sta->lq.general_params.single_stream_ant_msk = 2866 first_antenna(priv->nvm_data->valid_tx_ant); 2867 lq_sta->lq.general_params.dual_stream_ant_msk = 2868 priv->nvm_data->valid_tx_ant & 2869 ~first_antenna(priv->nvm_data->valid_tx_ant); 2870 if (!lq_sta->lq.general_params.dual_stream_ant_msk) { 2871 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB; 2872 } else if (num_of_ant(priv->nvm_data->valid_tx_ant) == 2) { 2873 lq_sta->lq.general_params.dual_stream_ant_msk = 2874 priv->nvm_data->valid_tx_ant; 2875 } 2876 2877 /* as default allow aggregation for all tids */ 2878 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID; 2879 lq_sta->drv = priv; 2880 2881 /* Set last_txrate_idx to lowest rate */ 2882 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta); 2883 if (sband->band == NL80211_BAND_5GHZ) 2884 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE; 2885 lq_sta->is_agg = 0; 2886 #ifdef CONFIG_MAC80211_DEBUGFS 2887 lq_sta->dbg_fixed_rate = 0; 2888 #endif 2889 2890 rs_initialize_lq(priv, sta, lq_sta); 2891 } 2892 2893 static void rs_fill_link_cmd(struct iwl_priv *priv, 2894 struct iwl_lq_sta *lq_sta, u32 new_rate) 2895 { 2896 struct iwl_scale_tbl_info tbl_type; 2897 int index = 0; 2898 int rate_idx; 2899 int repeat_rate = 0; 2900 u8 ant_toggle_cnt = 0; 2901 u8 use_ht_possible = 1; 2902 u8 valid_tx_ant = 0; 2903 struct iwl_station_priv *sta_priv = 2904 container_of(lq_sta, struct iwl_station_priv, lq_sta); 2905 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq; 2906 2907 /* Override starting rate (index 0) if needed for debug purposes */ 2908 rs_dbgfs_set_mcs(lq_sta, &new_rate, index); 2909 2910 /* Interpret new_rate (rate_n_flags) */ 2911 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, 2912 &tbl_type, &rate_idx); 2913 2914 if (priv && priv->bt_full_concurrent) { 2915 /* 1x1 only */ 2916 tbl_type.ant_type = 2917 first_antenna(priv->nvm_data->valid_tx_ant); 2918 } 2919 2920 /* How many times should we repeat the initial rate? */ 2921 if (is_legacy(tbl_type.lq_type)) { 2922 ant_toggle_cnt = 1; 2923 repeat_rate = IWL_NUMBER_TRY; 2924 } else { 2925 repeat_rate = min(IWL_HT_NUMBER_TRY, 2926 LINK_QUAL_AGG_DISABLE_START_DEF - 1); 2927 } 2928 2929 lq_cmd->general_params.mimo_delimiter = 2930 is_mimo(tbl_type.lq_type) ? 1 : 0; 2931 2932 /* Fill 1st table entry (index 0) */ 2933 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate); 2934 2935 if (num_of_ant(tbl_type.ant_type) == 1) { 2936 lq_cmd->general_params.single_stream_ant_msk = 2937 tbl_type.ant_type; 2938 } else if (num_of_ant(tbl_type.ant_type) == 2) { 2939 lq_cmd->general_params.dual_stream_ant_msk = 2940 tbl_type.ant_type; 2941 } /* otherwise we don't modify the existing value */ 2942 2943 index++; 2944 repeat_rate--; 2945 if (priv) { 2946 if (priv->bt_full_concurrent) 2947 valid_tx_ant = ANT_A; 2948 else 2949 valid_tx_ant = priv->nvm_data->valid_tx_ant; 2950 } 2951 2952 /* Fill rest of rate table */ 2953 while (index < LINK_QUAL_MAX_RETRY_NUM) { 2954 /* Repeat initial/next rate. 2955 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute. 2956 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */ 2957 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) { 2958 if (is_legacy(tbl_type.lq_type)) { 2959 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE) 2960 ant_toggle_cnt++; 2961 else if (priv && 2962 rs_toggle_antenna(valid_tx_ant, 2963 &new_rate, &tbl_type)) 2964 ant_toggle_cnt = 1; 2965 } 2966 2967 /* Override next rate if needed for debug purposes */ 2968 rs_dbgfs_set_mcs(lq_sta, &new_rate, index); 2969 2970 /* Fill next table entry */ 2971 lq_cmd->rs_table[index].rate_n_flags = 2972 cpu_to_le32(new_rate); 2973 repeat_rate--; 2974 index++; 2975 } 2976 2977 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type, 2978 &rate_idx); 2979 2980 if (priv && priv->bt_full_concurrent) { 2981 /* 1x1 only */ 2982 tbl_type.ant_type = 2983 first_antenna(priv->nvm_data->valid_tx_ant); 2984 } 2985 2986 /* Indicate to uCode which entries might be MIMO. 2987 * If initial rate was MIMO, this will finally end up 2988 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */ 2989 if (is_mimo(tbl_type.lq_type)) 2990 lq_cmd->general_params.mimo_delimiter = index; 2991 2992 /* Get next rate */ 2993 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx, 2994 use_ht_possible); 2995 2996 /* How many times should we repeat the next rate? */ 2997 if (is_legacy(tbl_type.lq_type)) { 2998 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE) 2999 ant_toggle_cnt++; 3000 else if (priv && 3001 rs_toggle_antenna(valid_tx_ant, 3002 &new_rate, &tbl_type)) 3003 ant_toggle_cnt = 1; 3004 3005 repeat_rate = IWL_NUMBER_TRY; 3006 } else { 3007 repeat_rate = IWL_HT_NUMBER_TRY; 3008 } 3009 3010 /* Don't allow HT rates after next pass. 3011 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */ 3012 use_ht_possible = 0; 3013 3014 /* Override next rate if needed for debug purposes */ 3015 rs_dbgfs_set_mcs(lq_sta, &new_rate, index); 3016 3017 /* Fill next table entry */ 3018 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate); 3019 3020 index++; 3021 repeat_rate--; 3022 } 3023 3024 lq_cmd->agg_params.agg_frame_cnt_limit = 3025 sta_priv->max_agg_bufsize ?: LINK_QUAL_AGG_FRAME_LIMIT_DEF; 3026 lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF; 3027 3028 lq_cmd->agg_params.agg_time_limit = 3029 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF); 3030 /* 3031 * overwrite if needed, pass aggregation time limit 3032 * to uCode in uSec 3033 */ 3034 if (priv && priv->lib->bt_params && 3035 priv->lib->bt_params->agg_time_limit && 3036 priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) 3037 lq_cmd->agg_params.agg_time_limit = 3038 cpu_to_le16(priv->lib->bt_params->agg_time_limit); 3039 } 3040 3041 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) 3042 { 3043 return hw->priv; 3044 } 3045 /* rate scale requires free function to be implemented */ 3046 static void rs_free(void *priv_rate) 3047 { 3048 return; 3049 } 3050 3051 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta, 3052 void *priv_sta) 3053 { 3054 struct iwl_op_mode *op_mode __maybe_unused = priv_r; 3055 struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode); 3056 3057 IWL_DEBUG_RATE(priv, "enter\n"); 3058 IWL_DEBUG_RATE(priv, "leave\n"); 3059 } 3060 3061 #ifdef CONFIG_MAC80211_DEBUGFS 3062 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta, 3063 u32 *rate_n_flags, int index) 3064 { 3065 struct iwl_priv *priv; 3066 u8 valid_tx_ant; 3067 u8 ant_sel_tx; 3068 3069 priv = lq_sta->drv; 3070 valid_tx_ant = priv->nvm_data->valid_tx_ant; 3071 if (lq_sta->dbg_fixed_rate) { 3072 ant_sel_tx = 3073 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK) 3074 >> RATE_MCS_ANT_POS); 3075 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) { 3076 *rate_n_flags = lq_sta->dbg_fixed_rate; 3077 IWL_DEBUG_RATE(priv, "Fixed rate ON\n"); 3078 } else { 3079 lq_sta->dbg_fixed_rate = 0; 3080 IWL_ERR(priv, 3081 "Invalid antenna selection 0x%X, Valid is 0x%X\n", 3082 ant_sel_tx, valid_tx_ant); 3083 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n"); 3084 } 3085 } else { 3086 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n"); 3087 } 3088 } 3089 3090 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file, 3091 const char __user *user_buf, size_t count, loff_t *ppos) 3092 { 3093 struct iwl_lq_sta *lq_sta = file->private_data; 3094 struct iwl_priv *priv; 3095 char buf[64]; 3096 size_t buf_size; 3097 u32 parsed_rate; 3098 3099 3100 priv = lq_sta->drv; 3101 memset(buf, 0, sizeof(buf)); 3102 buf_size = min(count, sizeof(buf) - 1); 3103 if (copy_from_user(buf, user_buf, buf_size)) 3104 return -EFAULT; 3105 3106 if (sscanf(buf, "%x", &parsed_rate) == 1) 3107 lq_sta->dbg_fixed_rate = parsed_rate; 3108 else 3109 lq_sta->dbg_fixed_rate = 0; 3110 3111 rs_program_fix_rate(priv, lq_sta); 3112 3113 return count; 3114 } 3115 3116 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file, 3117 char __user *user_buf, size_t count, loff_t *ppos) 3118 { 3119 char *buff; 3120 int desc = 0; 3121 int i = 0; 3122 int index = 0; 3123 ssize_t ret; 3124 3125 struct iwl_lq_sta *lq_sta = file->private_data; 3126 struct iwl_priv *priv; 3127 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 3128 3129 priv = lq_sta->drv; 3130 buff = kmalloc(1024, GFP_KERNEL); 3131 if (!buff) 3132 return -ENOMEM; 3133 3134 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id); 3135 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n", 3136 lq_sta->total_failed, lq_sta->total_success, 3137 lq_sta->active_legacy_rate); 3138 desc += sprintf(buff+desc, "fixed rate 0x%X\n", 3139 lq_sta->dbg_fixed_rate); 3140 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n", 3141 (priv->nvm_data->valid_tx_ant & ANT_A) ? "ANT_A," : "", 3142 (priv->nvm_data->valid_tx_ant & ANT_B) ? "ANT_B," : "", 3143 (priv->nvm_data->valid_tx_ant & ANT_C) ? "ANT_C" : ""); 3144 desc += sprintf(buff+desc, "lq type %s\n", 3145 (is_legacy(tbl->lq_type)) ? "legacy" : "HT"); 3146 if (is_Ht(tbl->lq_type)) { 3147 desc += sprintf(buff + desc, " %s", 3148 (is_siso(tbl->lq_type)) ? "SISO" : 3149 ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3")); 3150 desc += sprintf(buff + desc, " %s", 3151 (tbl->is_ht40) ? "40MHz" : "20MHz"); 3152 desc += sprintf(buff + desc, " %s %s %s\n", 3153 (tbl->is_SGI) ? "SGI" : "", 3154 (lq_sta->is_green) ? "GF enabled" : "", 3155 (lq_sta->is_agg) ? "AGG on" : ""); 3156 } 3157 desc += sprintf(buff+desc, "last tx rate=0x%X\n", 3158 lq_sta->last_rate_n_flags); 3159 desc += sprintf(buff+desc, "general:" 3160 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n", 3161 lq_sta->lq.general_params.flags, 3162 lq_sta->lq.general_params.mimo_delimiter, 3163 lq_sta->lq.general_params.single_stream_ant_msk, 3164 lq_sta->lq.general_params.dual_stream_ant_msk); 3165 3166 desc += sprintf(buff+desc, "agg:" 3167 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n", 3168 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit), 3169 lq_sta->lq.agg_params.agg_dis_start_th, 3170 lq_sta->lq.agg_params.agg_frame_cnt_limit); 3171 3172 desc += sprintf(buff+desc, 3173 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n", 3174 lq_sta->lq.general_params.start_rate_index[0], 3175 lq_sta->lq.general_params.start_rate_index[1], 3176 lq_sta->lq.general_params.start_rate_index[2], 3177 lq_sta->lq.general_params.start_rate_index[3]); 3178 3179 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) { 3180 index = iwl_hwrate_to_plcp_idx( 3181 le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags)); 3182 if (is_legacy(tbl->lq_type)) { 3183 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n", 3184 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags), 3185 iwl_rate_mcs[index].mbps); 3186 } else { 3187 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n", 3188 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags), 3189 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs); 3190 } 3191 } 3192 3193 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3194 kfree(buff); 3195 return ret; 3196 } 3197 3198 static const struct file_operations rs_sta_dbgfs_scale_table_ops = { 3199 .write = rs_sta_dbgfs_scale_table_write, 3200 .read = rs_sta_dbgfs_scale_table_read, 3201 .open = simple_open, 3202 .llseek = default_llseek, 3203 }; 3204 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file, 3205 char __user *user_buf, size_t count, loff_t *ppos) 3206 { 3207 char *buff; 3208 int desc = 0; 3209 int i, j; 3210 ssize_t ret; 3211 3212 struct iwl_lq_sta *lq_sta = file->private_data; 3213 3214 buff = kmalloc(1024, GFP_KERNEL); 3215 if (!buff) 3216 return -ENOMEM; 3217 3218 for (i = 0; i < LQ_SIZE; i++) { 3219 desc += sprintf(buff+desc, 3220 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n" 3221 "rate=0x%X\n", 3222 lq_sta->active_tbl == i ? "*" : "x", 3223 lq_sta->lq_info[i].lq_type, 3224 lq_sta->lq_info[i].is_SGI, 3225 lq_sta->lq_info[i].is_ht40, 3226 lq_sta->lq_info[i].is_dup, 3227 lq_sta->is_green, 3228 lq_sta->lq_info[i].current_rate); 3229 for (j = 0; j < IWL_RATE_COUNT; j++) { 3230 desc += sprintf(buff+desc, 3231 "counter=%d success=%d %%=%d\n", 3232 lq_sta->lq_info[i].win[j].counter, 3233 lq_sta->lq_info[i].win[j].success_counter, 3234 lq_sta->lq_info[i].win[j].success_ratio); 3235 } 3236 } 3237 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3238 kfree(buff); 3239 return ret; 3240 } 3241 3242 static const struct file_operations rs_sta_dbgfs_stats_table_ops = { 3243 .read = rs_sta_dbgfs_stats_table_read, 3244 .open = simple_open, 3245 .llseek = default_llseek, 3246 }; 3247 3248 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file, 3249 char __user *user_buf, size_t count, loff_t *ppos) 3250 { 3251 struct iwl_lq_sta *lq_sta = file->private_data; 3252 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl]; 3253 char buff[120]; 3254 int desc = 0; 3255 3256 if (is_Ht(tbl->lq_type)) 3257 desc += sprintf(buff+desc, 3258 "Bit Rate= %d Mb/s\n", 3259 tbl->expected_tpt[lq_sta->last_txrate_idx]); 3260 else 3261 desc += sprintf(buff+desc, 3262 "Bit Rate= %d Mb/s\n", 3263 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1); 3264 3265 return simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3266 } 3267 3268 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = { 3269 .read = rs_sta_dbgfs_rate_scale_data_read, 3270 .open = simple_open, 3271 .llseek = default_llseek, 3272 }; 3273 3274 static void rs_add_debugfs(void *priv, void *priv_sta, 3275 struct dentry *dir) 3276 { 3277 struct iwl_lq_sta *lq_sta = priv_sta; 3278 lq_sta->rs_sta_dbgfs_scale_table_file = 3279 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir, 3280 lq_sta, &rs_sta_dbgfs_scale_table_ops); 3281 lq_sta->rs_sta_dbgfs_stats_table_file = 3282 debugfs_create_file("rate_stats_table", S_IRUSR, dir, 3283 lq_sta, &rs_sta_dbgfs_stats_table_ops); 3284 lq_sta->rs_sta_dbgfs_rate_scale_data_file = 3285 debugfs_create_file("rate_scale_data", S_IRUSR, dir, 3286 lq_sta, &rs_sta_dbgfs_rate_scale_data_ops); 3287 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file = 3288 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir, 3289 &lq_sta->tx_agg_tid_en); 3290 3291 } 3292 3293 static void rs_remove_debugfs(void *priv, void *priv_sta) 3294 { 3295 struct iwl_lq_sta *lq_sta = priv_sta; 3296 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file); 3297 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file); 3298 debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file); 3299 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file); 3300 } 3301 #endif 3302 3303 /* 3304 * Initialization of rate scaling information is done by driver after 3305 * the station is added. Since mac80211 calls this function before a 3306 * station is added we ignore it. 3307 */ 3308 static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband, 3309 struct cfg80211_chan_def *chandef, 3310 struct ieee80211_sta *sta, void *priv_sta) 3311 { 3312 } 3313 3314 static const struct rate_control_ops rs_ops = { 3315 .name = RS_NAME, 3316 .tx_status = rs_tx_status, 3317 .get_rate = rs_get_rate, 3318 .rate_init = rs_rate_init_stub, 3319 .alloc = rs_alloc, 3320 .free = rs_free, 3321 .alloc_sta = rs_alloc_sta, 3322 .free_sta = rs_free_sta, 3323 #ifdef CONFIG_MAC80211_DEBUGFS 3324 .add_sta_debugfs = rs_add_debugfs, 3325 .remove_sta_debugfs = rs_remove_debugfs, 3326 #endif 3327 }; 3328 3329 int iwlagn_rate_control_register(void) 3330 { 3331 return ieee80211_rate_control_register(&rs_ops); 3332 } 3333 3334 void iwlagn_rate_control_unregister(void) 3335 { 3336 ieee80211_rate_control_unregister(&rs_ops); 3337 } 3338 3339