1/****************************************************************************** 2 * 3 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved. 4 * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of version 2 of the GNU General Public License as 8 * published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 13 * more details. 14 * 15 * You should have received a copy of the GNU General Public License along with 16 * this program; if not, write to the Free Software Foundation, Inc., 17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA 18 * 19 * The full GNU General Public License is included in this distribution in the 20 * file called LICENSE. 21 * 22 * Contact Information: 23 * Intel Linux Wireless <ilw@linux.intel.com> 24 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 25 * 26 *****************************************************************************/ 27#include <linux/kernel.h> 28#include <linux/skbuff.h> 29#include <linux/slab.h> 30#include <net/mac80211.h> 31 32#include <linux/netdevice.h> 33#include <linux/etherdevice.h> 34#include <linux/delay.h> 35 36#include <linux/workqueue.h> 37#include "rs.h" 38#include "fw-api.h" 39#include "sta.h" 40#include "iwl-op-mode.h" 41#include "mvm.h" 42#include "debugfs.h" 43 44#define RS_NAME "iwl-mvm-rs" 45 46#define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */ 47 48/* Calculations of success ratio are done in fixed point where 12800 is 100%. 49 * Use this macro when dealing with thresholds consts set as a percentage 50 */ 51#define RS_PERCENT(x) (128 * x) 52 53static u8 rs_ht_to_legacy[] = { 54 [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX, 55 [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX, 56 [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX, 57 [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX, 58 [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX, 59 [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX, 60 [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX, 61 [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX, 62 [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX, 63 [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX, 64}; 65 66static const u8 ant_toggle_lookup[] = { 67 [ANT_NONE] = ANT_NONE, 68 [ANT_A] = ANT_B, 69 [ANT_B] = ANT_C, 70 [ANT_AB] = ANT_BC, 71 [ANT_C] = ANT_A, 72 [ANT_AC] = ANT_AB, 73 [ANT_BC] = ANT_AC, 74 [ANT_ABC] = ANT_ABC, 75}; 76 77#define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \ 78 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \ 79 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \ 80 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \ 81 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \ 82 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\ 83 IWL_RATE_##rp##M_INDEX, \ 84 IWL_RATE_##rn##M_INDEX } 85 86#define IWL_DECLARE_MCS_RATE(s) \ 87 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \ 88 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \ 89 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \ 90 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \ 91 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \ 92 IWL_RATE_INVM_INDEX, \ 93 IWL_RATE_INVM_INDEX } 94 95/* 96 * Parameter order: 97 * rate, ht rate, prev rate, next rate 98 * 99 * If there isn't a valid next or previous rate then INV is used which 100 * maps to IWL_RATE_INVALID 101 * 102 */ 103static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = { 104 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */ 105 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */ 106 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */ 107 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */ 108 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */ 109 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */ 110 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */ 111 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */ 112 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */ 113 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */ 114 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */ 115 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */ 116 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */ 117 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */ 118 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */ 119}; 120 121enum rs_action { 122 RS_ACTION_STAY = 0, 123 RS_ACTION_DOWNSCALE = -1, 124 RS_ACTION_UPSCALE = 1, 125}; 126 127enum rs_column_mode { 128 RS_INVALID = 0, 129 RS_LEGACY, 130 RS_SISO, 131 RS_MIMO2, 132}; 133 134#define MAX_NEXT_COLUMNS 7 135#define MAX_COLUMN_CHECKS 3 136 137struct rs_tx_column; 138 139typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm, 140 struct ieee80211_sta *sta, 141 struct iwl_scale_tbl_info *tbl, 142 const struct rs_tx_column *next_col); 143 144struct rs_tx_column { 145 enum rs_column_mode mode; 146 u8 ant; 147 bool sgi; 148 enum rs_column next_columns[MAX_NEXT_COLUMNS]; 149 allow_column_func_t checks[MAX_COLUMN_CHECKS]; 150}; 151 152static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 153 struct iwl_scale_tbl_info *tbl, 154 const struct rs_tx_column *next_col) 155{ 156 return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant); 157} 158 159static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 160 struct iwl_scale_tbl_info *tbl, 161 const struct rs_tx_column *next_col) 162{ 163 struct iwl_mvm_sta *mvmsta; 164 struct iwl_mvm_vif *mvmvif; 165 166 if (!sta->ht_cap.ht_supported) 167 return false; 168 169 if (sta->smps_mode == IEEE80211_SMPS_STATIC) 170 return false; 171 172 if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2) 173 return false; 174 175 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 176 return false; 177 178 mvmsta = iwl_mvm_sta_from_mac80211(sta); 179 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif); 180 if (iwl_mvm_vif_low_latency(mvmvif) && mvmsta->vif->p2p) 181 return false; 182 183 if (mvm->nvm_data->sku_cap_mimo_disabled) 184 return false; 185 186 return true; 187} 188 189static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 190 struct iwl_scale_tbl_info *tbl, 191 const struct rs_tx_column *next_col) 192{ 193 if (!sta->ht_cap.ht_supported) 194 return false; 195 196 return true; 197} 198 199static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 200 struct iwl_scale_tbl_info *tbl, 201 const struct rs_tx_column *next_col) 202{ 203 struct rs_rate *rate = &tbl->rate; 204 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 205 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; 206 207 if (is_ht20(rate) && (ht_cap->cap & 208 IEEE80211_HT_CAP_SGI_20)) 209 return true; 210 if (is_ht40(rate) && (ht_cap->cap & 211 IEEE80211_HT_CAP_SGI_40)) 212 return true; 213 if (is_ht80(rate) && (vht_cap->cap & 214 IEEE80211_VHT_CAP_SHORT_GI_80)) 215 return true; 216 217 return false; 218} 219 220static const struct rs_tx_column rs_tx_columns[] = { 221 [RS_COLUMN_LEGACY_ANT_A] = { 222 .mode = RS_LEGACY, 223 .ant = ANT_A, 224 .next_columns = { 225 RS_COLUMN_LEGACY_ANT_B, 226 RS_COLUMN_SISO_ANT_A, 227 RS_COLUMN_MIMO2, 228 RS_COLUMN_INVALID, 229 RS_COLUMN_INVALID, 230 RS_COLUMN_INVALID, 231 RS_COLUMN_INVALID, 232 }, 233 .checks = { 234 rs_ant_allow, 235 }, 236 }, 237 [RS_COLUMN_LEGACY_ANT_B] = { 238 .mode = RS_LEGACY, 239 .ant = ANT_B, 240 .next_columns = { 241 RS_COLUMN_LEGACY_ANT_A, 242 RS_COLUMN_SISO_ANT_B, 243 RS_COLUMN_MIMO2, 244 RS_COLUMN_INVALID, 245 RS_COLUMN_INVALID, 246 RS_COLUMN_INVALID, 247 RS_COLUMN_INVALID, 248 }, 249 .checks = { 250 rs_ant_allow, 251 }, 252 }, 253 [RS_COLUMN_SISO_ANT_A] = { 254 .mode = RS_SISO, 255 .ant = ANT_A, 256 .next_columns = { 257 RS_COLUMN_SISO_ANT_B, 258 RS_COLUMN_MIMO2, 259 RS_COLUMN_SISO_ANT_A_SGI, 260 RS_COLUMN_LEGACY_ANT_A, 261 RS_COLUMN_LEGACY_ANT_B, 262 RS_COLUMN_INVALID, 263 RS_COLUMN_INVALID, 264 }, 265 .checks = { 266 rs_siso_allow, 267 rs_ant_allow, 268 }, 269 }, 270 [RS_COLUMN_SISO_ANT_B] = { 271 .mode = RS_SISO, 272 .ant = ANT_B, 273 .next_columns = { 274 RS_COLUMN_SISO_ANT_A, 275 RS_COLUMN_MIMO2, 276 RS_COLUMN_SISO_ANT_B_SGI, 277 RS_COLUMN_LEGACY_ANT_A, 278 RS_COLUMN_LEGACY_ANT_B, 279 RS_COLUMN_INVALID, 280 RS_COLUMN_INVALID, 281 }, 282 .checks = { 283 rs_siso_allow, 284 rs_ant_allow, 285 }, 286 }, 287 [RS_COLUMN_SISO_ANT_A_SGI] = { 288 .mode = RS_SISO, 289 .ant = ANT_A, 290 .sgi = true, 291 .next_columns = { 292 RS_COLUMN_SISO_ANT_B_SGI, 293 RS_COLUMN_MIMO2_SGI, 294 RS_COLUMN_SISO_ANT_A, 295 RS_COLUMN_LEGACY_ANT_A, 296 RS_COLUMN_LEGACY_ANT_B, 297 RS_COLUMN_INVALID, 298 RS_COLUMN_INVALID, 299 }, 300 .checks = { 301 rs_siso_allow, 302 rs_ant_allow, 303 rs_sgi_allow, 304 }, 305 }, 306 [RS_COLUMN_SISO_ANT_B_SGI] = { 307 .mode = RS_SISO, 308 .ant = ANT_B, 309 .sgi = true, 310 .next_columns = { 311 RS_COLUMN_SISO_ANT_A_SGI, 312 RS_COLUMN_MIMO2_SGI, 313 RS_COLUMN_SISO_ANT_B, 314 RS_COLUMN_LEGACY_ANT_A, 315 RS_COLUMN_LEGACY_ANT_B, 316 RS_COLUMN_INVALID, 317 RS_COLUMN_INVALID, 318 }, 319 .checks = { 320 rs_siso_allow, 321 rs_ant_allow, 322 rs_sgi_allow, 323 }, 324 }, 325 [RS_COLUMN_MIMO2] = { 326 .mode = RS_MIMO2, 327 .ant = ANT_AB, 328 .next_columns = { 329 RS_COLUMN_SISO_ANT_A, 330 RS_COLUMN_MIMO2_SGI, 331 RS_COLUMN_LEGACY_ANT_A, 332 RS_COLUMN_LEGACY_ANT_B, 333 RS_COLUMN_INVALID, 334 RS_COLUMN_INVALID, 335 RS_COLUMN_INVALID, 336 }, 337 .checks = { 338 rs_mimo_allow, 339 }, 340 }, 341 [RS_COLUMN_MIMO2_SGI] = { 342 .mode = RS_MIMO2, 343 .ant = ANT_AB, 344 .sgi = true, 345 .next_columns = { 346 RS_COLUMN_SISO_ANT_A_SGI, 347 RS_COLUMN_MIMO2, 348 RS_COLUMN_LEGACY_ANT_A, 349 RS_COLUMN_LEGACY_ANT_B, 350 RS_COLUMN_INVALID, 351 RS_COLUMN_INVALID, 352 RS_COLUMN_INVALID, 353 }, 354 .checks = { 355 rs_mimo_allow, 356 rs_sgi_allow, 357 }, 358 }, 359}; 360 361static inline u8 rs_extract_rate(u32 rate_n_flags) 362{ 363 /* also works for HT because bits 7:6 are zero there */ 364 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK); 365} 366 367static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags) 368{ 369 int idx = 0; 370 371 if (rate_n_flags & RATE_MCS_HT_MSK) { 372 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK; 373 idx += IWL_RATE_MCS_0_INDEX; 374 375 /* skip 9M not supported in HT*/ 376 if (idx >= IWL_RATE_9M_INDEX) 377 idx += 1; 378 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE)) 379 return idx; 380 } else if (rate_n_flags & RATE_MCS_VHT_MSK) { 381 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK; 382 idx += IWL_RATE_MCS_0_INDEX; 383 384 /* skip 9M not supported in VHT*/ 385 if (idx >= IWL_RATE_9M_INDEX) 386 idx++; 387 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE)) 388 return idx; 389 } else { 390 /* legacy rate format, search for match in table */ 391 392 u8 legacy_rate = rs_extract_rate(rate_n_flags); 393 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++) 394 if (iwl_rates[idx].plcp == legacy_rate) 395 return idx; 396 } 397 398 return IWL_RATE_INVALID; 399} 400 401static void rs_rate_scale_perform(struct iwl_mvm *mvm, 402 struct ieee80211_sta *sta, 403 struct iwl_lq_sta *lq_sta, 404 int tid); 405static void rs_fill_lq_cmd(struct iwl_mvm *mvm, 406 struct ieee80211_sta *sta, 407 struct iwl_lq_sta *lq_sta, 408 const struct rs_rate *initial_rate); 409static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search); 410 411/** 412 * The following tables contain the expected throughput metrics for all rates 413 * 414 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits 415 * 416 * where invalid entries are zeros. 417 * 418 * CCK rates are only valid in legacy table and will only be used in G 419 * (2.4 GHz) band. 420 */ 421 422static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = { 423 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0 424}; 425 426/* Expected TpT tables. 4 indexes: 427 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI 428 */ 429static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = { 430 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0}, 431 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0}, 432 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0}, 433 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0}, 434}; 435 436static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = { 437 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275}, 438 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280}, 439 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173}, 440 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284}, 441}; 442 443static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = { 444 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308}, 445 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312}, 446 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466}, 447 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691}, 448}; 449 450static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = { 451 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0}, 452 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0}, 453 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0}, 454 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0}, 455}; 456 457static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = { 458 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300}, 459 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303}, 460 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053}, 461 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221}, 462}; 463 464static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = { 465 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319}, 466 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320}, 467 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219}, 468 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545}, 469}; 470 471/* mbps, mcs */ 472static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = { 473 { "1", "BPSK DSSS"}, 474 { "2", "QPSK DSSS"}, 475 {"5.5", "BPSK CCK"}, 476 { "11", "QPSK CCK"}, 477 { "6", "BPSK 1/2"}, 478 { "9", "BPSK 1/2"}, 479 { "12", "QPSK 1/2"}, 480 { "18", "QPSK 3/4"}, 481 { "24", "16QAM 1/2"}, 482 { "36", "16QAM 3/4"}, 483 { "48", "64QAM 2/3"}, 484 { "54", "64QAM 3/4"}, 485 { "60", "64QAM 5/6"}, 486}; 487 488#define MCS_INDEX_PER_STREAM (8) 489 490static const char *rs_pretty_ant(u8 ant) 491{ 492 static const char * const ant_name[] = { 493 [ANT_NONE] = "None", 494 [ANT_A] = "A", 495 [ANT_B] = "B", 496 [ANT_AB] = "AB", 497 [ANT_C] = "C", 498 [ANT_AC] = "AC", 499 [ANT_BC] = "BC", 500 [ANT_ABC] = "ABC", 501 }; 502 503 if (ant > ANT_ABC) 504 return "UNKNOWN"; 505 506 return ant_name[ant]; 507} 508 509static const char *rs_pretty_lq_type(enum iwl_table_type type) 510{ 511 static const char * const lq_types[] = { 512 [LQ_NONE] = "NONE", 513 [LQ_LEGACY_A] = "LEGACY_A", 514 [LQ_LEGACY_G] = "LEGACY_G", 515 [LQ_HT_SISO] = "HT SISO", 516 [LQ_HT_MIMO2] = "HT MIMO", 517 [LQ_VHT_SISO] = "VHT SISO", 518 [LQ_VHT_MIMO2] = "VHT MIMO", 519 }; 520 521 if (type < LQ_NONE || type >= LQ_MAX) 522 return "UNKNOWN"; 523 524 return lq_types[type]; 525} 526 527static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate, 528 const char *prefix) 529{ 530 IWL_DEBUG_RATE(mvm, 531 "%s: (%s: %d) ANT: %s BW: %d SGI: %d LDPC: %d STBC: %d\n", 532 prefix, rs_pretty_lq_type(rate->type), 533 rate->index, rs_pretty_ant(rate->ant), 534 rate->bw, rate->sgi, rate->ldpc, rate->stbc); 535} 536 537static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window) 538{ 539 window->data = 0; 540 window->success_counter = 0; 541 window->success_ratio = IWL_INVALID_VALUE; 542 window->counter = 0; 543 window->average_tpt = IWL_INVALID_VALUE; 544} 545 546static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm, 547 struct iwl_scale_tbl_info *tbl) 548{ 549 int i; 550 551 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n"); 552 for (i = 0; i < IWL_RATE_COUNT; i++) 553 rs_rate_scale_clear_window(&tbl->win[i]); 554 555 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++) 556 rs_rate_scale_clear_window(&tbl->tpc_win[i]); 557} 558 559static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type) 560{ 561 return (ant_type & valid_antenna) == ant_type; 562} 563 564static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm, 565 struct iwl_lq_sta *lq_data, u8 tid, 566 struct ieee80211_sta *sta) 567{ 568 int ret = -EAGAIN; 569 570 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n", 571 sta->addr, tid); 572 ret = ieee80211_start_tx_ba_session(sta, tid, 5000); 573 if (ret == -EAGAIN) { 574 /* 575 * driver and mac80211 is out of sync 576 * this might be cause by reloading firmware 577 * stop the tx ba session here 578 */ 579 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n", 580 tid); 581 ieee80211_stop_tx_ba_session(sta, tid); 582 } 583 return ret; 584} 585 586static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid, 587 struct iwl_lq_sta *lq_data, 588 struct ieee80211_sta *sta) 589{ 590 if (tid < IWL_MAX_TID_COUNT) 591 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta); 592 else 593 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n", 594 tid, IWL_MAX_TID_COUNT); 595} 596 597static inline int get_num_of_ant_from_rate(u32 rate_n_flags) 598{ 599 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) + 600 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) + 601 !!(rate_n_flags & RATE_MCS_ANT_C_MSK); 602} 603 604/* 605 * Static function to get the expected throughput from an iwl_scale_tbl_info 606 * that wraps a NULL pointer check 607 */ 608static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index) 609{ 610 if (tbl->expected_tpt) 611 return tbl->expected_tpt[rs_index]; 612 return 0; 613} 614 615/** 616 * rs_collect_tx_data - Update the success/failure sliding window 617 * 618 * We keep a sliding window of the last 62 packets transmitted 619 * at this rate. window->data contains the bitmask of successful 620 * packets. 621 */ 622static int _rs_collect_tx_data(struct iwl_mvm *mvm, 623 struct iwl_scale_tbl_info *tbl, 624 int scale_index, int attempts, int successes, 625 struct iwl_rate_scale_data *window) 626{ 627 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1)); 628 s32 fail_count, tpt; 629 630 /* Get expected throughput */ 631 tpt = get_expected_tpt(tbl, scale_index); 632 633 /* 634 * Keep track of only the latest 62 tx frame attempts in this rate's 635 * history window; anything older isn't really relevant any more. 636 * If we have filled up the sliding window, drop the oldest attempt; 637 * if the oldest attempt (highest bit in bitmap) shows "success", 638 * subtract "1" from the success counter (this is the main reason 639 * we keep these bitmaps!). 640 */ 641 while (attempts > 0) { 642 if (window->counter >= IWL_RATE_MAX_WINDOW) { 643 /* remove earliest */ 644 window->counter = IWL_RATE_MAX_WINDOW - 1; 645 646 if (window->data & mask) { 647 window->data &= ~mask; 648 window->success_counter--; 649 } 650 } 651 652 /* Increment frames-attempted counter */ 653 window->counter++; 654 655 /* Shift bitmap by one frame to throw away oldest history */ 656 window->data <<= 1; 657 658 /* Mark the most recent #successes attempts as successful */ 659 if (successes > 0) { 660 window->success_counter++; 661 window->data |= 0x1; 662 successes--; 663 } 664 665 attempts--; 666 } 667 668 /* Calculate current success ratio, avoid divide-by-0! */ 669 if (window->counter > 0) 670 window->success_ratio = 128 * (100 * window->success_counter) 671 / window->counter; 672 else 673 window->success_ratio = IWL_INVALID_VALUE; 674 675 fail_count = window->counter - window->success_counter; 676 677 /* Calculate average throughput, if we have enough history. */ 678 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) || 679 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) 680 window->average_tpt = (window->success_ratio * tpt + 64) / 128; 681 else 682 window->average_tpt = IWL_INVALID_VALUE; 683 684 return 0; 685} 686 687static int rs_collect_tx_data(struct iwl_mvm *mvm, 688 struct iwl_lq_sta *lq_sta, 689 struct iwl_scale_tbl_info *tbl, 690 int scale_index, int attempts, int successes, 691 u8 reduced_txp) 692{ 693 struct iwl_rate_scale_data *window = NULL; 694 int ret; 695 696 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT) 697 return -EINVAL; 698 699 if (tbl->column != RS_COLUMN_INVALID) { 700 struct lq_sta_pers *pers = &lq_sta->pers; 701 702 pers->tx_stats[tbl->column][scale_index].total += attempts; 703 pers->tx_stats[tbl->column][scale_index].success += successes; 704 } 705 706 /* Select window for current tx bit rate */ 707 window = &(tbl->win[scale_index]); 708 709 ret = _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes, 710 window); 711 if (ret) 712 return ret; 713 714 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION)) 715 return -EINVAL; 716 717 window = &tbl->tpc_win[reduced_txp]; 718 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes, 719 window); 720} 721 722/* Convert rs_rate object into ucode rate bitmask */ 723static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm, 724 struct rs_rate *rate) 725{ 726 u32 ucode_rate = 0; 727 int index = rate->index; 728 729 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) & 730 RATE_MCS_ANT_ABC_MSK); 731 732 if (is_legacy(rate)) { 733 ucode_rate |= iwl_rates[index].plcp; 734 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE) 735 ucode_rate |= RATE_MCS_CCK_MSK; 736 return ucode_rate; 737 } 738 739 if (is_ht(rate)) { 740 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) { 741 IWL_ERR(mvm, "Invalid HT rate index %d\n", index); 742 index = IWL_LAST_HT_RATE; 743 } 744 ucode_rate |= RATE_MCS_HT_MSK; 745 746 if (is_ht_siso(rate)) 747 ucode_rate |= iwl_rates[index].plcp_ht_siso; 748 else if (is_ht_mimo2(rate)) 749 ucode_rate |= iwl_rates[index].plcp_ht_mimo2; 750 else 751 WARN_ON_ONCE(1); 752 } else if (is_vht(rate)) { 753 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) { 754 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index); 755 index = IWL_LAST_VHT_RATE; 756 } 757 ucode_rate |= RATE_MCS_VHT_MSK; 758 if (is_vht_siso(rate)) 759 ucode_rate |= iwl_rates[index].plcp_vht_siso; 760 else if (is_vht_mimo2(rate)) 761 ucode_rate |= iwl_rates[index].plcp_vht_mimo2; 762 else 763 WARN_ON_ONCE(1); 764 765 } else { 766 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type); 767 } 768 769 if (is_siso(rate) && rate->stbc) { 770 /* To enable STBC we need to set both a flag and ANT_AB */ 771 ucode_rate |= RATE_MCS_ANT_AB_MSK; 772 ucode_rate |= RATE_MCS_VHT_STBC_MSK; 773 } 774 775 ucode_rate |= rate->bw; 776 if (rate->sgi) 777 ucode_rate |= RATE_MCS_SGI_MSK; 778 if (rate->ldpc) 779 ucode_rate |= RATE_MCS_LDPC_MSK; 780 781 return ucode_rate; 782} 783 784/* Convert a ucode rate into an rs_rate object */ 785static int rs_rate_from_ucode_rate(const u32 ucode_rate, 786 enum ieee80211_band band, 787 struct rs_rate *rate) 788{ 789 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK; 790 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate); 791 u8 nss; 792 793 memset(rate, 0, sizeof(*rate)); 794 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate); 795 796 if (rate->index == IWL_RATE_INVALID) 797 return -EINVAL; 798 799 rate->ant = (ant_msk >> RATE_MCS_ANT_POS); 800 801 /* Legacy */ 802 if (!(ucode_rate & RATE_MCS_HT_MSK) && 803 !(ucode_rate & RATE_MCS_VHT_MSK)) { 804 if (num_of_ant == 1) { 805 if (band == IEEE80211_BAND_5GHZ) 806 rate->type = LQ_LEGACY_A; 807 else 808 rate->type = LQ_LEGACY_G; 809 } 810 811 return 0; 812 } 813 814 /* HT or VHT */ 815 if (ucode_rate & RATE_MCS_SGI_MSK) 816 rate->sgi = true; 817 if (ucode_rate & RATE_MCS_LDPC_MSK) 818 rate->ldpc = true; 819 if (ucode_rate & RATE_MCS_VHT_STBC_MSK) 820 rate->stbc = true; 821 if (ucode_rate & RATE_MCS_BF_MSK) 822 rate->bfer = true; 823 824 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK; 825 826 if (ucode_rate & RATE_MCS_HT_MSK) { 827 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >> 828 RATE_HT_MCS_NSS_POS) + 1; 829 830 if (nss == 1) { 831 rate->type = LQ_HT_SISO; 832 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 833 "stbc %d bfer %d", 834 rate->stbc, rate->bfer); 835 } else if (nss == 2) { 836 rate->type = LQ_HT_MIMO2; 837 WARN_ON_ONCE(num_of_ant != 2); 838 } else { 839 WARN_ON_ONCE(1); 840 } 841 } else if (ucode_rate & RATE_MCS_VHT_MSK) { 842 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >> 843 RATE_VHT_MCS_NSS_POS) + 1; 844 845 if (nss == 1) { 846 rate->type = LQ_VHT_SISO; 847 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 848 "stbc %d bfer %d", 849 rate->stbc, rate->bfer); 850 } else if (nss == 2) { 851 rate->type = LQ_VHT_MIMO2; 852 WARN_ON_ONCE(num_of_ant != 2); 853 } else { 854 WARN_ON_ONCE(1); 855 } 856 } 857 858 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160); 859 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 && 860 !is_vht(rate)); 861 862 return 0; 863} 864 865/* switch to another antenna/antennas and return 1 */ 866/* if no other valid antenna found, return 0 */ 867static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate) 868{ 869 u8 new_ant_type; 870 871 if (!rate->ant || rate->ant > ANT_ABC) 872 return 0; 873 874 if (!rs_is_valid_ant(valid_ant, rate->ant)) 875 return 0; 876 877 new_ant_type = ant_toggle_lookup[rate->ant]; 878 879 while ((new_ant_type != rate->ant) && 880 !rs_is_valid_ant(valid_ant, new_ant_type)) 881 new_ant_type = ant_toggle_lookup[new_ant_type]; 882 883 if (new_ant_type == rate->ant) 884 return 0; 885 886 rate->ant = new_ant_type; 887 888 return 1; 889} 890 891static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta, 892 struct rs_rate *rate) 893{ 894 if (is_legacy(rate)) 895 return lq_sta->active_legacy_rate; 896 else if (is_siso(rate)) 897 return lq_sta->active_siso_rate; 898 else if (is_mimo2(rate)) 899 return lq_sta->active_mimo2_rate; 900 901 WARN_ON_ONCE(1); 902 return 0; 903} 904 905static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask, 906 int rate_type) 907{ 908 u8 high = IWL_RATE_INVALID; 909 u8 low = IWL_RATE_INVALID; 910 911 /* 802.11A or ht walks to the next literal adjacent rate in 912 * the rate table */ 913 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) { 914 int i; 915 u32 mask; 916 917 /* Find the previous rate that is in the rate mask */ 918 i = index - 1; 919 for (mask = (1 << i); i >= 0; i--, mask >>= 1) { 920 if (rate_mask & mask) { 921 low = i; 922 break; 923 } 924 } 925 926 /* Find the next rate that is in the rate mask */ 927 i = index + 1; 928 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) { 929 if (rate_mask & mask) { 930 high = i; 931 break; 932 } 933 } 934 935 return (high << 8) | low; 936 } 937 938 low = index; 939 while (low != IWL_RATE_INVALID) { 940 low = iwl_rates[low].prev_rs; 941 if (low == IWL_RATE_INVALID) 942 break; 943 if (rate_mask & (1 << low)) 944 break; 945 } 946 947 high = index; 948 while (high != IWL_RATE_INVALID) { 949 high = iwl_rates[high].next_rs; 950 if (high == IWL_RATE_INVALID) 951 break; 952 if (rate_mask & (1 << high)) 953 break; 954 } 955 956 return (high << 8) | low; 957} 958 959static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta, 960 struct rs_rate *rate) 961{ 962 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate); 963} 964 965/* Get the next supported lower rate in the current column. 966 * Return true if bottom rate in the current column was reached 967 */ 968static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta, 969 struct rs_rate *rate) 970{ 971 u8 low; 972 u16 high_low; 973 u16 rate_mask; 974 struct iwl_mvm *mvm = lq_sta->pers.drv; 975 976 rate_mask = rs_get_supported_rates(lq_sta, rate); 977 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask, 978 rate->type); 979 low = high_low & 0xff; 980 981 /* Bottom rate of column reached */ 982 if (low == IWL_RATE_INVALID) 983 return true; 984 985 rate->index = low; 986 return false; 987} 988 989/* Get the next rate to use following a column downgrade */ 990static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta, 991 struct rs_rate *rate) 992{ 993 struct iwl_mvm *mvm = lq_sta->pers.drv; 994 995 if (is_legacy(rate)) { 996 /* No column to downgrade from Legacy */ 997 return; 998 } else if (is_siso(rate)) { 999 /* Downgrade to Legacy if we were in SISO */ 1000 if (lq_sta->band == IEEE80211_BAND_5GHZ) 1001 rate->type = LQ_LEGACY_A; 1002 else 1003 rate->type = LQ_LEGACY_G; 1004 1005 rate->bw = RATE_MCS_CHAN_WIDTH_20; 1006 1007 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX || 1008 rate->index > IWL_RATE_MCS_9_INDEX); 1009 1010 rate->index = rs_ht_to_legacy[rate->index]; 1011 rate->ldpc = false; 1012 } else { 1013 /* Downgrade to SISO with same MCS if in MIMO */ 1014 rate->type = is_vht_mimo2(rate) ? 1015 LQ_VHT_SISO : LQ_HT_SISO; 1016 } 1017 1018 if (num_of_ant(rate->ant) > 1) 1019 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm)); 1020 1021 /* Relevant in both switching to SISO or Legacy */ 1022 rate->sgi = false; 1023 1024 if (!rs_rate_supported(lq_sta, rate)) 1025 rs_get_lower_rate_in_column(lq_sta, rate); 1026} 1027 1028/* Check if both rates are identical 1029 * allow_ant_mismatch enables matching a SISO rate on ANT_A or ANT_B 1030 * with a rate indicating STBC/BFER and ANT_AB. 1031 */ 1032static inline bool rs_rate_equal(struct rs_rate *a, 1033 struct rs_rate *b, 1034 bool allow_ant_mismatch) 1035 1036{ 1037 bool ant_match = (a->ant == b->ant) && (a->stbc == b->stbc) && 1038 (a->bfer == b->bfer); 1039 1040 if (allow_ant_mismatch) { 1041 if (a->stbc || a->bfer) { 1042 WARN_ONCE(a->ant != ANT_AB, "stbc %d bfer %d ant %d", 1043 a->stbc, a->bfer, a->ant); 1044 ant_match |= (b->ant == ANT_A || b->ant == ANT_B); 1045 } else if (b->stbc || b->bfer) { 1046 WARN_ONCE(b->ant != ANT_AB, "stbc %d bfer %d ant %d", 1047 b->stbc, b->bfer, b->ant); 1048 ant_match |= (a->ant == ANT_A || a->ant == ANT_B); 1049 } 1050 } 1051 1052 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) && 1053 (a->ldpc == b->ldpc) && (a->index == b->index) && ant_match; 1054} 1055 1056/* Check if both rates share the same column */ 1057static inline bool rs_rate_column_match(struct rs_rate *a, 1058 struct rs_rate *b) 1059{ 1060 bool ant_match; 1061 1062 if (a->stbc || a->bfer) 1063 ant_match = (b->ant == ANT_A || b->ant == ANT_B); 1064 else 1065 ant_match = (a->ant == b->ant); 1066 1067 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) 1068 && ant_match; 1069} 1070 1071static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate) 1072{ 1073 if (is_legacy(rate)) { 1074 if (rate->ant == ANT_A) 1075 return RS_COLUMN_LEGACY_ANT_A; 1076 1077 if (rate->ant == ANT_B) 1078 return RS_COLUMN_LEGACY_ANT_B; 1079 1080 goto err; 1081 } 1082 1083 if (is_siso(rate)) { 1084 if (rate->ant == ANT_A || rate->stbc || rate->bfer) 1085 return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI : 1086 RS_COLUMN_SISO_ANT_A; 1087 1088 if (rate->ant == ANT_B) 1089 return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI : 1090 RS_COLUMN_SISO_ANT_B; 1091 1092 goto err; 1093 } 1094 1095 if (is_mimo(rate)) 1096 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2; 1097 1098err: 1099 return RS_COLUMN_INVALID; 1100} 1101 1102static u8 rs_get_tid(struct ieee80211_hdr *hdr) 1103{ 1104 u8 tid = IWL_MAX_TID_COUNT; 1105 1106 if (ieee80211_is_data_qos(hdr->frame_control)) { 1107 u8 *qc = ieee80211_get_qos_ctl(hdr); 1108 tid = qc[0] & 0xf; 1109 } 1110 1111 if (unlikely(tid > IWL_MAX_TID_COUNT)) 1112 tid = IWL_MAX_TID_COUNT; 1113 1114 return tid; 1115} 1116 1117void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1118 int tid, struct ieee80211_tx_info *info) 1119{ 1120 int legacy_success; 1121 int retries; 1122 int i; 1123 struct iwl_lq_cmd *table; 1124 u32 lq_hwrate; 1125 struct rs_rate lq_rate, tx_resp_rate; 1126 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl; 1127 u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0]; 1128 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1]; 1129 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 1130 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta; 1131 bool allow_ant_mismatch = mvm->fw->ucode_capa.api[0] & 1132 IWL_UCODE_TLV_API_LQ_SS_PARAMS; 1133 1134 /* Treat uninitialized rate scaling data same as non-existing. */ 1135 if (!lq_sta) { 1136 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n"); 1137 return; 1138 } else if (!lq_sta->pers.drv) { 1139 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n"); 1140 return; 1141 } 1142 1143 /* This packet was aggregated but doesn't carry status info */ 1144 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 1145 !(info->flags & IEEE80211_TX_STAT_AMPDU)) 1146 return; 1147 1148 rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate); 1149 1150#ifdef CONFIG_MAC80211_DEBUGFS 1151 /* Disable last tx check if we are debugging with fixed rate but 1152 * update tx stats */ 1153 if (lq_sta->pers.dbg_fixed_rate) { 1154 int index = tx_resp_rate.index; 1155 enum rs_column column; 1156 int attempts, success; 1157 1158 column = rs_get_column_from_rate(&tx_resp_rate); 1159 if (WARN_ONCE(column == RS_COLUMN_INVALID, 1160 "Can't map rate 0x%x to column", 1161 tx_resp_hwrate)) 1162 return; 1163 1164 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 1165 attempts = info->status.ampdu_len; 1166 success = info->status.ampdu_ack_len; 1167 } else { 1168 attempts = info->status.rates[0].count; 1169 success = !!(info->flags & IEEE80211_TX_STAT_ACK); 1170 } 1171 1172 lq_sta->pers.tx_stats[column][index].total += attempts; 1173 lq_sta->pers.tx_stats[column][index].success += success; 1174 1175 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n", 1176 tx_resp_hwrate, success, attempts); 1177 return; 1178 } 1179#endif 1180 1181 if (time_after(jiffies, 1182 (unsigned long)(lq_sta->last_tx + 1183 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) { 1184 int t; 1185 1186 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n"); 1187 for (t = 0; t < IWL_MAX_TID_COUNT; t++) 1188 ieee80211_stop_tx_ba_session(sta, t); 1189 1190 iwl_mvm_rs_rate_init(mvm, sta, info->band, false); 1191 return; 1192 } 1193 lq_sta->last_tx = jiffies; 1194 1195 /* Ignore this Tx frame response if its initial rate doesn't match 1196 * that of latest Link Quality command. There may be stragglers 1197 * from a previous Link Quality command, but we're no longer interested 1198 * in those; they're either from the "active" mode while we're trying 1199 * to check "search" mode, or a prior "search" mode after we've moved 1200 * to a new "search" mode (which might become the new "active" mode). 1201 */ 1202 table = &lq_sta->lq; 1203 lq_hwrate = le32_to_cpu(table->rs_table[0]); 1204 rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate); 1205 1206 /* Here we actually compare this rate to the latest LQ command */ 1207 if (!rs_rate_equal(&tx_resp_rate, &lq_rate, allow_ant_mismatch)) { 1208 IWL_DEBUG_RATE(mvm, 1209 "initial tx resp rate 0x%x does not match 0x%x\n", 1210 tx_resp_hwrate, lq_hwrate); 1211 1212 /* 1213 * Since rates mis-match, the last LQ command may have failed. 1214 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with 1215 * ... driver. 1216 */ 1217 lq_sta->missed_rate_counter++; 1218 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) { 1219 lq_sta->missed_rate_counter = 0; 1220 IWL_DEBUG_RATE(mvm, 1221 "Too many rates mismatch. Send sync LQ. rs_state %d\n", 1222 lq_sta->rs_state); 1223 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false); 1224 } 1225 /* Regardless, ignore this status info for outdated rate */ 1226 return; 1227 } else 1228 /* Rate did match, so reset the missed_rate_counter */ 1229 lq_sta->missed_rate_counter = 0; 1230 1231 if (!lq_sta->search_better_tbl) { 1232 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1233 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1234 } else { 1235 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1236 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1237 } 1238 1239 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) { 1240 IWL_DEBUG_RATE(mvm, 1241 "Neither active nor search matches tx rate\n"); 1242 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1243 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE"); 1244 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1245 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH"); 1246 rs_dump_rate(mvm, &lq_rate, "ACTUAL"); 1247 1248 /* 1249 * no matching table found, let's by-pass the data collection 1250 * and continue to perform rate scale to find the rate table 1251 */ 1252 rs_stay_in_table(lq_sta, true); 1253 goto done; 1254 } 1255 1256 /* 1257 * Updating the frame history depends on whether packets were 1258 * aggregated. 1259 * 1260 * For aggregation, all packets were transmitted at the same rate, the 1261 * first index into rate scale table. 1262 */ 1263 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 1264 /* ampdu_ack_len = 0 marks no BA was received. In this case 1265 * treat it as a single frame loss as we don't want the success 1266 * ratio to dip too quickly because a BA wasn't received 1267 */ 1268 if (info->status.ampdu_ack_len == 0) 1269 info->status.ampdu_len = 1; 1270 1271 rs_collect_tx_data(mvm, lq_sta, curr_tbl, lq_rate.index, 1272 info->status.ampdu_len, 1273 info->status.ampdu_ack_len, 1274 reduced_txp); 1275 1276 /* Update success/fail counts if not searching for new mode */ 1277 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1278 lq_sta->total_success += info->status.ampdu_ack_len; 1279 lq_sta->total_failed += (info->status.ampdu_len - 1280 info->status.ampdu_ack_len); 1281 } 1282 } else { 1283 /* For legacy, update frame history with for each Tx retry. */ 1284 retries = info->status.rates[0].count - 1; 1285 /* HW doesn't send more than 15 retries */ 1286 retries = min(retries, 15); 1287 1288 /* The last transmission may have been successful */ 1289 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK); 1290 /* Collect data for each rate used during failed TX attempts */ 1291 for (i = 0; i <= retries; ++i) { 1292 lq_hwrate = le32_to_cpu(table->rs_table[i]); 1293 rs_rate_from_ucode_rate(lq_hwrate, info->band, 1294 &lq_rate); 1295 /* 1296 * Only collect stats if retried rate is in the same RS 1297 * table as active/search. 1298 */ 1299 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate)) 1300 tmp_tbl = curr_tbl; 1301 else if (rs_rate_column_match(&lq_rate, 1302 &other_tbl->rate)) 1303 tmp_tbl = other_tbl; 1304 else 1305 continue; 1306 1307 rs_collect_tx_data(mvm, lq_sta, tmp_tbl, lq_rate.index, 1308 1, i < retries ? 0 : legacy_success, 1309 reduced_txp); 1310 } 1311 1312 /* Update success/fail counts if not searching for new mode */ 1313 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1314 lq_sta->total_success += legacy_success; 1315 lq_sta->total_failed += retries + (1 - legacy_success); 1316 } 1317 } 1318 /* The last TX rate is cached in lq_sta; it's set in if/else above */ 1319 lq_sta->last_rate_n_flags = lq_hwrate; 1320 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp); 1321done: 1322 /* See if there's a better rate or modulation mode to try. */ 1323 if (sta->supp_rates[info->band]) 1324 rs_rate_scale_perform(mvm, sta, lq_sta, tid); 1325} 1326 1327/* 1328 * mac80211 sends us Tx status 1329 */ 1330static void rs_mac80211_tx_status(void *mvm_r, 1331 struct ieee80211_supported_band *sband, 1332 struct ieee80211_sta *sta, void *priv_sta, 1333 struct sk_buff *skb) 1334{ 1335 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1336 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r; 1337 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 1338 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1339 1340 if (!iwl_mvm_sta_from_mac80211(sta)->vif) 1341 return; 1342 1343 if (!ieee80211_is_data(hdr->frame_control) || 1344 info->flags & IEEE80211_TX_CTL_NO_ACK) 1345 return; 1346 1347 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info); 1348} 1349 1350/* 1351 * Begin a period of staying with a selected modulation mode. 1352 * Set "stay_in_tbl" flag to prevent any mode switches. 1353 * Set frame tx success limits according to legacy vs. high-throughput, 1354 * and reset overall (spanning all rates) tx success history statistics. 1355 * These control how long we stay using same modulation mode before 1356 * searching for a new mode. 1357 */ 1358static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy, 1359 struct iwl_lq_sta *lq_sta) 1360{ 1361 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n"); 1362 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN; 1363 if (is_legacy) { 1364 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT; 1365 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT; 1366 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT; 1367 } else { 1368 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT; 1369 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT; 1370 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT; 1371 } 1372 lq_sta->table_count = 0; 1373 lq_sta->total_failed = 0; 1374 lq_sta->total_success = 0; 1375 lq_sta->flush_timer = jiffies; 1376 lq_sta->visited_columns = 0; 1377} 1378 1379static inline int rs_get_max_rate_from_mask(unsigned long rate_mask) 1380{ 1381 if (rate_mask) 1382 return find_last_bit(&rate_mask, BITS_PER_LONG); 1383 return IWL_RATE_INVALID; 1384} 1385 1386static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta, 1387 const struct rs_tx_column *column) 1388{ 1389 switch (column->mode) { 1390 case RS_LEGACY: 1391 return lq_sta->max_legacy_rate_idx; 1392 case RS_SISO: 1393 return lq_sta->max_siso_rate_idx; 1394 case RS_MIMO2: 1395 return lq_sta->max_mimo2_rate_idx; 1396 default: 1397 WARN_ON_ONCE(1); 1398 } 1399 1400 return lq_sta->max_legacy_rate_idx; 1401} 1402 1403static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1404 const struct rs_tx_column *column, 1405 u32 bw) 1406{ 1407 /* Used to choose among HT tables */ 1408 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT]; 1409 1410 if (WARN_ON_ONCE(column->mode != RS_LEGACY && 1411 column->mode != RS_SISO && 1412 column->mode != RS_MIMO2)) 1413 return expected_tpt_legacy; 1414 1415 /* Legacy rates have only one table */ 1416 if (column->mode == RS_LEGACY) 1417 return expected_tpt_legacy; 1418 1419 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1420 /* Choose among many HT tables depending on number of streams 1421 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation 1422 * status */ 1423 if (column->mode == RS_SISO) { 1424 switch (bw) { 1425 case RATE_MCS_CHAN_WIDTH_20: 1426 ht_tbl_pointer = expected_tpt_siso_20MHz; 1427 break; 1428 case RATE_MCS_CHAN_WIDTH_40: 1429 ht_tbl_pointer = expected_tpt_siso_40MHz; 1430 break; 1431 case RATE_MCS_CHAN_WIDTH_80: 1432 ht_tbl_pointer = expected_tpt_siso_80MHz; 1433 break; 1434 default: 1435 WARN_ON_ONCE(1); 1436 } 1437 } else if (column->mode == RS_MIMO2) { 1438 switch (bw) { 1439 case RATE_MCS_CHAN_WIDTH_20: 1440 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1441 break; 1442 case RATE_MCS_CHAN_WIDTH_40: 1443 ht_tbl_pointer = expected_tpt_mimo2_40MHz; 1444 break; 1445 case RATE_MCS_CHAN_WIDTH_80: 1446 ht_tbl_pointer = expected_tpt_mimo2_80MHz; 1447 break; 1448 default: 1449 WARN_ON_ONCE(1); 1450 } 1451 } else { 1452 WARN_ON_ONCE(1); 1453 } 1454 1455 if (!column->sgi && !lq_sta->is_agg) /* Normal */ 1456 return ht_tbl_pointer[0]; 1457 else if (column->sgi && !lq_sta->is_agg) /* SGI */ 1458 return ht_tbl_pointer[1]; 1459 else if (!column->sgi && lq_sta->is_agg) /* AGG */ 1460 return ht_tbl_pointer[2]; 1461 else /* AGG+SGI */ 1462 return ht_tbl_pointer[3]; 1463} 1464 1465static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1466 struct iwl_scale_tbl_info *tbl) 1467{ 1468 struct rs_rate *rate = &tbl->rate; 1469 const struct rs_tx_column *column = &rs_tx_columns[tbl->column]; 1470 1471 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw); 1472} 1473 1474static s32 rs_get_best_rate(struct iwl_mvm *mvm, 1475 struct iwl_lq_sta *lq_sta, 1476 struct iwl_scale_tbl_info *tbl, /* "search" */ 1477 unsigned long rate_mask, s8 index) 1478{ 1479 struct iwl_scale_tbl_info *active_tbl = 1480 &(lq_sta->lq_info[lq_sta->active_tbl]); 1481 s32 success_ratio = active_tbl->win[index].success_ratio; 1482 u16 expected_current_tpt = active_tbl->expected_tpt[index]; 1483 const u16 *tpt_tbl = tbl->expected_tpt; 1484 u16 high_low; 1485 u32 target_tpt; 1486 int rate_idx; 1487 1488 if (success_ratio > IWL_MVM_RS_SR_NO_DECREASE) { 1489 target_tpt = 100 * expected_current_tpt; 1490 IWL_DEBUG_RATE(mvm, 1491 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n", 1492 success_ratio, target_tpt); 1493 } else { 1494 target_tpt = lq_sta->last_tpt; 1495 IWL_DEBUG_RATE(mvm, 1496 "SR %d not thag good. Find rate exceeding ACTUAL_TPT %d\n", 1497 success_ratio, target_tpt); 1498 } 1499 1500 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG); 1501 1502 while (rate_idx != IWL_RATE_INVALID) { 1503 if (target_tpt < (100 * tpt_tbl[rate_idx])) 1504 break; 1505 1506 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask, 1507 tbl->rate.type); 1508 1509 rate_idx = (high_low >> 8) & 0xff; 1510 } 1511 1512 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n", 1513 rate_idx, target_tpt, 1514 rate_idx != IWL_RATE_INVALID ? 1515 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE); 1516 1517 return rate_idx; 1518} 1519 1520static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta) 1521{ 1522 if (sta->bandwidth >= IEEE80211_STA_RX_BW_80) 1523 return RATE_MCS_CHAN_WIDTH_80; 1524 else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40) 1525 return RATE_MCS_CHAN_WIDTH_40; 1526 1527 return RATE_MCS_CHAN_WIDTH_20; 1528} 1529 1530/* 1531 * Check whether we should continue using same modulation mode, or 1532 * begin search for a new mode, based on: 1533 * 1) # tx successes or failures while using this mode 1534 * 2) # times calling this function 1535 * 3) elapsed time in this mode (not used, for now) 1536 */ 1537static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search) 1538{ 1539 struct iwl_scale_tbl_info *tbl; 1540 int active_tbl; 1541 int flush_interval_passed = 0; 1542 struct iwl_mvm *mvm; 1543 1544 mvm = lq_sta->pers.drv; 1545 active_tbl = lq_sta->active_tbl; 1546 1547 tbl = &(lq_sta->lq_info[active_tbl]); 1548 1549 /* If we've been disallowing search, see if we should now allow it */ 1550 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1551 /* Elapsed time using current modulation mode */ 1552 if (lq_sta->flush_timer) 1553 flush_interval_passed = 1554 time_after(jiffies, 1555 (unsigned long)(lq_sta->flush_timer + 1556 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ))); 1557 1558 /* 1559 * Check if we should allow search for new modulation mode. 1560 * If many frames have failed or succeeded, or we've used 1561 * this same modulation for a long time, allow search, and 1562 * reset history stats that keep track of whether we should 1563 * allow a new search. Also (below) reset all bitmaps and 1564 * stats in active history. 1565 */ 1566 if (force_search || 1567 (lq_sta->total_failed > lq_sta->max_failure_limit) || 1568 (lq_sta->total_success > lq_sta->max_success_limit) || 1569 ((!lq_sta->search_better_tbl) && 1570 (lq_sta->flush_timer) && (flush_interval_passed))) { 1571 IWL_DEBUG_RATE(mvm, 1572 "LQ: stay is expired %d %d %d\n", 1573 lq_sta->total_failed, 1574 lq_sta->total_success, 1575 flush_interval_passed); 1576 1577 /* Allow search for new mode */ 1578 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED; 1579 IWL_DEBUG_RATE(mvm, 1580 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n"); 1581 lq_sta->total_failed = 0; 1582 lq_sta->total_success = 0; 1583 lq_sta->flush_timer = 0; 1584 /* mark the current column as visited */ 1585 lq_sta->visited_columns = BIT(tbl->column); 1586 /* 1587 * Else if we've used this modulation mode enough repetitions 1588 * (regardless of elapsed time or success/failure), reset 1589 * history bitmaps and rate-specific stats for all rates in 1590 * active table. 1591 */ 1592 } else { 1593 lq_sta->table_count++; 1594 if (lq_sta->table_count >= 1595 lq_sta->table_count_limit) { 1596 lq_sta->table_count = 0; 1597 1598 IWL_DEBUG_RATE(mvm, 1599 "LQ: stay in table clear win\n"); 1600 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1601 } 1602 } 1603 1604 /* If transitioning to allow "search", reset all history 1605 * bitmaps and stats in active table (this will become the new 1606 * "search" table). */ 1607 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) { 1608 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1609 } 1610 } 1611} 1612 1613/* 1614 * setup rate table in uCode 1615 */ 1616static void rs_update_rate_tbl(struct iwl_mvm *mvm, 1617 struct ieee80211_sta *sta, 1618 struct iwl_lq_sta *lq_sta, 1619 struct iwl_scale_tbl_info *tbl) 1620{ 1621 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate); 1622 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false); 1623} 1624 1625static enum rs_column rs_get_next_column(struct iwl_mvm *mvm, 1626 struct iwl_lq_sta *lq_sta, 1627 struct ieee80211_sta *sta, 1628 struct iwl_scale_tbl_info *tbl) 1629{ 1630 int i, j, max_rate; 1631 enum rs_column next_col_id; 1632 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column]; 1633 const struct rs_tx_column *next_col; 1634 allow_column_func_t allow_func; 1635 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm); 1636 const u16 *expected_tpt_tbl; 1637 u16 tpt, max_expected_tpt; 1638 1639 for (i = 0; i < MAX_NEXT_COLUMNS; i++) { 1640 next_col_id = curr_col->next_columns[i]; 1641 1642 if (next_col_id == RS_COLUMN_INVALID) 1643 continue; 1644 1645 if (lq_sta->visited_columns & BIT(next_col_id)) { 1646 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n", 1647 next_col_id); 1648 continue; 1649 } 1650 1651 next_col = &rs_tx_columns[next_col_id]; 1652 1653 if (!rs_is_valid_ant(valid_ants, next_col->ant)) { 1654 IWL_DEBUG_RATE(mvm, 1655 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n", 1656 next_col_id, valid_ants, next_col->ant); 1657 continue; 1658 } 1659 1660 for (j = 0; j < MAX_COLUMN_CHECKS; j++) { 1661 allow_func = next_col->checks[j]; 1662 if (allow_func && !allow_func(mvm, sta, tbl, next_col)) 1663 break; 1664 } 1665 1666 if (j != MAX_COLUMN_CHECKS) { 1667 IWL_DEBUG_RATE(mvm, 1668 "Skip column %d: not allowed (check %d failed)\n", 1669 next_col_id, j); 1670 1671 continue; 1672 } 1673 1674 tpt = lq_sta->last_tpt / 100; 1675 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col, 1676 rs_bw_from_sta_bw(sta)); 1677 if (WARN_ON_ONCE(!expected_tpt_tbl)) 1678 continue; 1679 1680 max_rate = rs_get_max_allowed_rate(lq_sta, next_col); 1681 if (max_rate == IWL_RATE_INVALID) { 1682 IWL_DEBUG_RATE(mvm, 1683 "Skip column %d: no rate is allowed in this column\n", 1684 next_col_id); 1685 continue; 1686 } 1687 1688 max_expected_tpt = expected_tpt_tbl[max_rate]; 1689 if (tpt >= max_expected_tpt) { 1690 IWL_DEBUG_RATE(mvm, 1691 "Skip column %d: can't beat current TPT. Max expected %d current %d\n", 1692 next_col_id, max_expected_tpt, tpt); 1693 continue; 1694 } 1695 1696 IWL_DEBUG_RATE(mvm, 1697 "Found potential column %d. Max expected %d current %d\n", 1698 next_col_id, max_expected_tpt, tpt); 1699 break; 1700 } 1701 1702 if (i == MAX_NEXT_COLUMNS) 1703 return RS_COLUMN_INVALID; 1704 1705 return next_col_id; 1706} 1707 1708static int rs_switch_to_column(struct iwl_mvm *mvm, 1709 struct iwl_lq_sta *lq_sta, 1710 struct ieee80211_sta *sta, 1711 enum rs_column col_id) 1712{ 1713 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1714 struct iwl_scale_tbl_info *search_tbl = 1715 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 1716 struct rs_rate *rate = &search_tbl->rate; 1717 const struct rs_tx_column *column = &rs_tx_columns[col_id]; 1718 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column]; 1719 u32 sz = (sizeof(struct iwl_scale_tbl_info) - 1720 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); 1721 unsigned long rate_mask = 0; 1722 u32 rate_idx = 0; 1723 1724 memcpy(search_tbl, tbl, sz); 1725 1726 rate->sgi = column->sgi; 1727 rate->ant = column->ant; 1728 1729 if (column->mode == RS_LEGACY) { 1730 if (lq_sta->band == IEEE80211_BAND_5GHZ) 1731 rate->type = LQ_LEGACY_A; 1732 else 1733 rate->type = LQ_LEGACY_G; 1734 1735 rate->bw = RATE_MCS_CHAN_WIDTH_20; 1736 rate->ldpc = false; 1737 rate_mask = lq_sta->active_legacy_rate; 1738 } else if (column->mode == RS_SISO) { 1739 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; 1740 rate_mask = lq_sta->active_siso_rate; 1741 } else if (column->mode == RS_MIMO2) { 1742 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; 1743 rate_mask = lq_sta->active_mimo2_rate; 1744 } else { 1745 WARN_ON_ONCE("Bad column mode"); 1746 } 1747 1748 if (column->mode != RS_LEGACY) { 1749 rate->bw = rs_bw_from_sta_bw(sta); 1750 rate->ldpc = lq_sta->ldpc; 1751 } 1752 1753 search_tbl->column = col_id; 1754 rs_set_expected_tpt_table(lq_sta, search_tbl); 1755 1756 lq_sta->visited_columns |= BIT(col_id); 1757 1758 /* Get the best matching rate if we're changing modes. e.g. 1759 * SISO->MIMO, LEGACY->SISO, MIMO->SISO 1760 */ 1761 if (curr_column->mode != column->mode) { 1762 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl, 1763 rate_mask, rate->index); 1764 1765 if ((rate_idx == IWL_RATE_INVALID) || 1766 !(BIT(rate_idx) & rate_mask)) { 1767 IWL_DEBUG_RATE(mvm, 1768 "can not switch with index %d" 1769 " rate mask %lx\n", 1770 rate_idx, rate_mask); 1771 1772 goto err; 1773 } 1774 1775 rate->index = rate_idx; 1776 } 1777 1778 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n", 1779 col_id, rate->index); 1780 1781 return 0; 1782 1783err: 1784 rate->type = LQ_NONE; 1785 return -1; 1786} 1787 1788static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm, 1789 struct iwl_scale_tbl_info *tbl, 1790 s32 sr, int low, int high, 1791 int current_tpt, 1792 int low_tpt, int high_tpt) 1793{ 1794 enum rs_action action = RS_ACTION_STAY; 1795 1796 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) || 1797 (current_tpt == 0)) { 1798 IWL_DEBUG_RATE(mvm, 1799 "Decrease rate because of low SR\n"); 1800 return RS_ACTION_DOWNSCALE; 1801 } 1802 1803 if ((low_tpt == IWL_INVALID_VALUE) && 1804 (high_tpt == IWL_INVALID_VALUE) && 1805 (high != IWL_RATE_INVALID)) { 1806 IWL_DEBUG_RATE(mvm, 1807 "No data about high/low rates. Increase rate\n"); 1808 return RS_ACTION_UPSCALE; 1809 } 1810 1811 if ((high_tpt == IWL_INVALID_VALUE) && 1812 (high != IWL_RATE_INVALID) && 1813 (low_tpt != IWL_INVALID_VALUE) && 1814 (low_tpt < current_tpt)) { 1815 IWL_DEBUG_RATE(mvm, 1816 "No data about high rate and low rate is worse. Increase rate\n"); 1817 return RS_ACTION_UPSCALE; 1818 } 1819 1820 if ((high_tpt != IWL_INVALID_VALUE) && 1821 (high_tpt > current_tpt)) { 1822 IWL_DEBUG_RATE(mvm, 1823 "Higher rate is better. Increate rate\n"); 1824 return RS_ACTION_UPSCALE; 1825 } 1826 1827 if ((low_tpt != IWL_INVALID_VALUE) && 1828 (high_tpt != IWL_INVALID_VALUE) && 1829 (low_tpt < current_tpt) && 1830 (high_tpt < current_tpt)) { 1831 IWL_DEBUG_RATE(mvm, 1832 "Both high and low are worse. Maintain rate\n"); 1833 return RS_ACTION_STAY; 1834 } 1835 1836 if ((low_tpt != IWL_INVALID_VALUE) && 1837 (low_tpt > current_tpt)) { 1838 IWL_DEBUG_RATE(mvm, 1839 "Lower rate is better\n"); 1840 action = RS_ACTION_DOWNSCALE; 1841 goto out; 1842 } 1843 1844 if ((low_tpt == IWL_INVALID_VALUE) && 1845 (low != IWL_RATE_INVALID)) { 1846 IWL_DEBUG_RATE(mvm, 1847 "No data about lower rate\n"); 1848 action = RS_ACTION_DOWNSCALE; 1849 goto out; 1850 } 1851 1852 IWL_DEBUG_RATE(mvm, "Maintain rate\n"); 1853 1854out: 1855 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) { 1856 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { 1857 IWL_DEBUG_RATE(mvm, 1858 "SR is above NO DECREASE. Avoid downscale\n"); 1859 action = RS_ACTION_STAY; 1860 } else if (current_tpt > (100 * tbl->expected_tpt[low])) { 1861 IWL_DEBUG_RATE(mvm, 1862 "Current TPT is higher than max expected in low rate. Avoid downscale\n"); 1863 action = RS_ACTION_STAY; 1864 } else { 1865 IWL_DEBUG_RATE(mvm, "Decrease rate\n"); 1866 } 1867 } 1868 1869 return action; 1870} 1871 1872static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1873 struct iwl_lq_sta *lq_sta) 1874{ 1875 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which 1876 * supports STBC of at least 1*SS 1877 */ 1878 if (!lq_sta->stbc_capable) 1879 return false; 1880 1881 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 1882 return false; 1883 1884 return true; 1885} 1886 1887static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index, 1888 int *weaker, int *stronger) 1889{ 1890 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP; 1891 if (*weaker > TPC_MAX_REDUCTION) 1892 *weaker = TPC_INVALID; 1893 1894 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP; 1895 if (*stronger < 0) 1896 *stronger = TPC_INVALID; 1897} 1898 1899static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif, 1900 struct rs_rate *rate, enum ieee80211_band band) 1901{ 1902 int index = rate->index; 1903 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM); 1904 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION && 1905 !vif->bss_conf.ps); 1906 1907 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n", 1908 cam, sta_ps_disabled); 1909 /* 1910 * allow tpc only if power management is enabled, or bt coex 1911 * activity grade allows it and we are on 2.4Ghz. 1912 */ 1913 if ((cam || sta_ps_disabled) && 1914 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band)) 1915 return false; 1916 1917 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type); 1918 if (is_legacy(rate)) 1919 return index == IWL_RATE_54M_INDEX; 1920 if (is_ht(rate)) 1921 return index == IWL_RATE_MCS_7_INDEX; 1922 if (is_vht(rate)) 1923 return index == IWL_RATE_MCS_7_INDEX || 1924 index == IWL_RATE_MCS_8_INDEX || 1925 index == IWL_RATE_MCS_9_INDEX; 1926 1927 WARN_ON_ONCE(1); 1928 return false; 1929} 1930 1931enum tpc_action { 1932 TPC_ACTION_STAY, 1933 TPC_ACTION_DECREASE, 1934 TPC_ACTION_INCREASE, 1935 TPC_ACTION_NO_RESTIRCTION, 1936}; 1937 1938static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm, 1939 s32 sr, int weak, int strong, 1940 int current_tpt, 1941 int weak_tpt, int strong_tpt) 1942{ 1943 /* stay until we have valid tpt */ 1944 if (current_tpt == IWL_INVALID_VALUE) { 1945 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n"); 1946 return TPC_ACTION_STAY; 1947 } 1948 1949 /* Too many failures, increase txp */ 1950 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) || 1951 current_tpt == 0) { 1952 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n"); 1953 return TPC_ACTION_NO_RESTIRCTION; 1954 } 1955 1956 /* try decreasing first if applicable */ 1957 if (weak != TPC_INVALID) { 1958 if (weak_tpt == IWL_INVALID_VALUE && 1959 (strong_tpt == IWL_INVALID_VALUE || 1960 current_tpt >= strong_tpt)) { 1961 IWL_DEBUG_RATE(mvm, 1962 "no weak txp measurement. decrease txp\n"); 1963 return TPC_ACTION_DECREASE; 1964 } 1965 1966 if (weak_tpt > current_tpt) { 1967 IWL_DEBUG_RATE(mvm, 1968 "lower txp has better tpt. decrease txp\n"); 1969 return TPC_ACTION_DECREASE; 1970 } 1971 } 1972 1973 /* next, increase if needed */ 1974 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) && 1975 strong != TPC_INVALID) { 1976 if (weak_tpt == IWL_INVALID_VALUE && 1977 strong_tpt != IWL_INVALID_VALUE && 1978 current_tpt < strong_tpt) { 1979 IWL_DEBUG_RATE(mvm, 1980 "higher txp has better tpt. increase txp\n"); 1981 return TPC_ACTION_INCREASE; 1982 } 1983 1984 if (weak_tpt < current_tpt && 1985 (strong_tpt == IWL_INVALID_VALUE || 1986 strong_tpt > current_tpt)) { 1987 IWL_DEBUG_RATE(mvm, 1988 "lower txp has worse tpt. increase txp\n"); 1989 return TPC_ACTION_INCREASE; 1990 } 1991 } 1992 1993 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n"); 1994 return TPC_ACTION_STAY; 1995} 1996 1997static bool rs_tpc_perform(struct iwl_mvm *mvm, 1998 struct ieee80211_sta *sta, 1999 struct iwl_lq_sta *lq_sta, 2000 struct iwl_scale_tbl_info *tbl) 2001{ 2002 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta); 2003 struct ieee80211_vif *vif = mvm_sta->vif; 2004 struct ieee80211_chanctx_conf *chanctx_conf; 2005 enum ieee80211_band band; 2006 struct iwl_rate_scale_data *window; 2007 struct rs_rate *rate = &tbl->rate; 2008 enum tpc_action action; 2009 s32 sr; 2010 u8 cur = lq_sta->lq.reduced_tpc; 2011 int current_tpt; 2012 int weak, strong; 2013 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE; 2014 2015#ifdef CONFIG_MAC80211_DEBUGFS 2016 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) { 2017 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n", 2018 lq_sta->pers.dbg_fixed_txp_reduction); 2019 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction; 2020 return cur != lq_sta->pers.dbg_fixed_txp_reduction; 2021 } 2022#endif 2023 2024 rcu_read_lock(); 2025 chanctx_conf = rcu_dereference(vif->chanctx_conf); 2026 if (WARN_ON(!chanctx_conf)) 2027 band = IEEE80211_NUM_BANDS; 2028 else 2029 band = chanctx_conf->def.chan->band; 2030 rcu_read_unlock(); 2031 2032 if (!rs_tpc_allowed(mvm, vif, rate, band)) { 2033 IWL_DEBUG_RATE(mvm, 2034 "tpc is not allowed. remove txp restrictions\n"); 2035 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 2036 return cur != TPC_NO_REDUCTION; 2037 } 2038 2039 rs_get_adjacent_txp(mvm, cur, &weak, &strong); 2040 2041 /* Collect measured throughputs for current and adjacent rates */ 2042 window = tbl->tpc_win; 2043 sr = window[cur].success_ratio; 2044 current_tpt = window[cur].average_tpt; 2045 if (weak != TPC_INVALID) 2046 weak_tpt = window[weak].average_tpt; 2047 if (strong != TPC_INVALID) 2048 strong_tpt = window[strong].average_tpt; 2049 2050 IWL_DEBUG_RATE(mvm, 2051 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n", 2052 cur, current_tpt, sr, weak, strong, 2053 weak_tpt, strong_tpt); 2054 2055 action = rs_get_tpc_action(mvm, sr, weak, strong, 2056 current_tpt, weak_tpt, strong_tpt); 2057 2058 /* override actions if we are on the edge */ 2059 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) { 2060 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n"); 2061 action = TPC_ACTION_STAY; 2062 } else if (strong == TPC_INVALID && 2063 (action == TPC_ACTION_INCREASE || 2064 action == TPC_ACTION_NO_RESTIRCTION)) { 2065 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n"); 2066 action = TPC_ACTION_STAY; 2067 } 2068 2069 switch (action) { 2070 case TPC_ACTION_DECREASE: 2071 lq_sta->lq.reduced_tpc = weak; 2072 return true; 2073 case TPC_ACTION_INCREASE: 2074 lq_sta->lq.reduced_tpc = strong; 2075 return true; 2076 case TPC_ACTION_NO_RESTIRCTION: 2077 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 2078 return true; 2079 case TPC_ACTION_STAY: 2080 /* do nothing */ 2081 break; 2082 } 2083 return false; 2084} 2085 2086/* 2087 * Do rate scaling and search for new modulation mode. 2088 */ 2089static void rs_rate_scale_perform(struct iwl_mvm *mvm, 2090 struct ieee80211_sta *sta, 2091 struct iwl_lq_sta *lq_sta, 2092 int tid) 2093{ 2094 int low = IWL_RATE_INVALID; 2095 int high = IWL_RATE_INVALID; 2096 int index; 2097 struct iwl_rate_scale_data *window = NULL; 2098 int current_tpt = IWL_INVALID_VALUE; 2099 int low_tpt = IWL_INVALID_VALUE; 2100 int high_tpt = IWL_INVALID_VALUE; 2101 u32 fail_count; 2102 enum rs_action scale_action = RS_ACTION_STAY; 2103 u16 rate_mask; 2104 u8 update_lq = 0; 2105 struct iwl_scale_tbl_info *tbl, *tbl1; 2106 u8 active_tbl = 0; 2107 u8 done_search = 0; 2108 u16 high_low; 2109 s32 sr; 2110 u8 prev_agg = lq_sta->is_agg; 2111 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta); 2112 struct iwl_mvm_tid_data *tid_data; 2113 struct rs_rate *rate; 2114 2115 lq_sta->is_agg = !!sta_priv->agg_tids; 2116 2117 /* 2118 * Select rate-scale / modulation-mode table to work with in 2119 * the rest of this function: "search" if searching for better 2120 * modulation mode, or "active" if doing rate scaling within a mode. 2121 */ 2122 if (!lq_sta->search_better_tbl) 2123 active_tbl = lq_sta->active_tbl; 2124 else 2125 active_tbl = 1 - lq_sta->active_tbl; 2126 2127 tbl = &(lq_sta->lq_info[active_tbl]); 2128 rate = &tbl->rate; 2129 2130 if (prev_agg != lq_sta->is_agg) { 2131 IWL_DEBUG_RATE(mvm, 2132 "Aggregation changed: prev %d current %d. Update expected TPT table\n", 2133 prev_agg, lq_sta->is_agg); 2134 rs_set_expected_tpt_table(lq_sta, tbl); 2135 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2136 } 2137 2138 /* current tx rate */ 2139 index = lq_sta->last_txrate_idx; 2140 2141 /* rates available for this association, and for modulation mode */ 2142 rate_mask = rs_get_supported_rates(lq_sta, rate); 2143 2144 if (!(BIT(index) & rate_mask)) { 2145 IWL_ERR(mvm, "Current Rate is not valid\n"); 2146 if (lq_sta->search_better_tbl) { 2147 /* revert to active table if search table is not valid*/ 2148 rate->type = LQ_NONE; 2149 lq_sta->search_better_tbl = 0; 2150 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 2151 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2152 } 2153 return; 2154 } 2155 2156 /* Get expected throughput table and history window for current rate */ 2157 if (!tbl->expected_tpt) { 2158 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n"); 2159 return; 2160 } 2161 2162 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2163 window = &(tbl->win[index]); 2164 2165 /* 2166 * If there is not enough history to calculate actual average 2167 * throughput, keep analyzing results of more tx frames, without 2168 * changing rate or mode (bypass most of the rest of this function). 2169 * Set up new rate table in uCode only if old rate is not supported 2170 * in current association (use new rate found above). 2171 */ 2172 fail_count = window->counter - window->success_counter; 2173 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) && 2174 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) { 2175 IWL_DEBUG_RATE(mvm, 2176 "(%s: %d): Test Window: succ %d total %d\n", 2177 rs_pretty_lq_type(rate->type), 2178 index, window->success_counter, window->counter); 2179 2180 /* Can't calculate this yet; not enough history */ 2181 window->average_tpt = IWL_INVALID_VALUE; 2182 2183 /* Should we stay with this modulation mode, 2184 * or search for a new one? */ 2185 rs_stay_in_table(lq_sta, false); 2186 2187 goto out; 2188 } 2189 /* Else we have enough samples; calculate estimate of 2190 * actual average throughput */ 2191 if (window->average_tpt != ((window->success_ratio * 2192 tbl->expected_tpt[index] + 64) / 128)) { 2193 window->average_tpt = ((window->success_ratio * 2194 tbl->expected_tpt[index] + 64) / 128); 2195 } 2196 2197 /* If we are searching for better modulation mode, check success. */ 2198 if (lq_sta->search_better_tbl) { 2199 /* If good success, continue using the "search" mode; 2200 * no need to send new link quality command, since we're 2201 * continuing to use the setup that we've been trying. */ 2202 if (window->average_tpt > lq_sta->last_tpt) { 2203 IWL_DEBUG_RATE(mvm, 2204 "SWITCHING TO NEW TABLE SR: %d " 2205 "cur-tpt %d old-tpt %d\n", 2206 window->success_ratio, 2207 window->average_tpt, 2208 lq_sta->last_tpt); 2209 2210 /* Swap tables; "search" becomes "active" */ 2211 lq_sta->active_tbl = active_tbl; 2212 current_tpt = window->average_tpt; 2213 /* Else poor success; go back to mode in "active" table */ 2214 } else { 2215 IWL_DEBUG_RATE(mvm, 2216 "GOING BACK TO THE OLD TABLE: SR %d " 2217 "cur-tpt %d old-tpt %d\n", 2218 window->success_ratio, 2219 window->average_tpt, 2220 lq_sta->last_tpt); 2221 2222 /* Nullify "search" table */ 2223 rate->type = LQ_NONE; 2224 2225 /* Revert to "active" table */ 2226 active_tbl = lq_sta->active_tbl; 2227 tbl = &(lq_sta->lq_info[active_tbl]); 2228 2229 /* Revert to "active" rate and throughput info */ 2230 index = tbl->rate.index; 2231 current_tpt = lq_sta->last_tpt; 2232 2233 /* Need to set up a new rate table in uCode */ 2234 update_lq = 1; 2235 } 2236 2237 /* Either way, we've made a decision; modulation mode 2238 * search is done, allow rate adjustment next time. */ 2239 lq_sta->search_better_tbl = 0; 2240 done_search = 1; /* Don't switch modes below! */ 2241 goto lq_update; 2242 } 2243 2244 /* (Else) not in search of better modulation mode, try for better 2245 * starting rate, while staying in this mode. */ 2246 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type); 2247 low = high_low & 0xff; 2248 high = (high_low >> 8) & 0xff; 2249 2250 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2251 2252 sr = window->success_ratio; 2253 2254 /* Collect measured throughputs for current and adjacent rates */ 2255 current_tpt = window->average_tpt; 2256 if (low != IWL_RATE_INVALID) 2257 low_tpt = tbl->win[low].average_tpt; 2258 if (high != IWL_RATE_INVALID) 2259 high_tpt = tbl->win[high].average_tpt; 2260 2261 IWL_DEBUG_RATE(mvm, 2262 "(%s: %d): cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n", 2263 rs_pretty_lq_type(rate->type), index, current_tpt, sr, 2264 low, high, low_tpt, high_tpt); 2265 2266 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high, 2267 current_tpt, low_tpt, high_tpt); 2268 2269 /* Force a search in case BT doesn't like us being in MIMO */ 2270 if (is_mimo(rate) && 2271 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) { 2272 IWL_DEBUG_RATE(mvm, 2273 "BT Coex forbids MIMO. Search for new config\n"); 2274 rs_stay_in_table(lq_sta, true); 2275 goto lq_update; 2276 } 2277 2278 switch (scale_action) { 2279 case RS_ACTION_DOWNSCALE: 2280 /* Decrease starting rate, update uCode's rate table */ 2281 if (low != IWL_RATE_INVALID) { 2282 update_lq = 1; 2283 index = low; 2284 } else { 2285 IWL_DEBUG_RATE(mvm, 2286 "At the bottom rate. Can't decrease\n"); 2287 } 2288 2289 break; 2290 case RS_ACTION_UPSCALE: 2291 /* Increase starting rate, update uCode's rate table */ 2292 if (high != IWL_RATE_INVALID) { 2293 update_lq = 1; 2294 index = high; 2295 } else { 2296 IWL_DEBUG_RATE(mvm, 2297 "At the top rate. Can't increase\n"); 2298 } 2299 2300 break; 2301 case RS_ACTION_STAY: 2302 /* No change */ 2303 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) 2304 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl); 2305 break; 2306 default: 2307 break; 2308 } 2309 2310lq_update: 2311 /* Replace uCode's rate table for the destination station. */ 2312 if (update_lq) { 2313 tbl->rate.index = index; 2314 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2315 } 2316 2317 rs_stay_in_table(lq_sta, false); 2318 2319 /* 2320 * Search for new modulation mode if we're: 2321 * 1) Not changing rates right now 2322 * 2) Not just finishing up a search 2323 * 3) Allowing a new search 2324 */ 2325 if (!update_lq && !done_search && 2326 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED 2327 && window->counter) { 2328 enum rs_column next_column; 2329 2330 /* Save current throughput to compare with "search" throughput*/ 2331 lq_sta->last_tpt = current_tpt; 2332 2333 IWL_DEBUG_RATE(mvm, 2334 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n", 2335 update_lq, done_search, lq_sta->rs_state, 2336 window->counter); 2337 2338 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl); 2339 if (next_column != RS_COLUMN_INVALID) { 2340 int ret = rs_switch_to_column(mvm, lq_sta, sta, 2341 next_column); 2342 if (!ret) 2343 lq_sta->search_better_tbl = 1; 2344 } else { 2345 IWL_DEBUG_RATE(mvm, 2346 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n"); 2347 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED; 2348 } 2349 2350 /* If new "search" mode was selected, set up in uCode table */ 2351 if (lq_sta->search_better_tbl) { 2352 /* Access the "search" table, clear its history. */ 2353 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 2354 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2355 2356 /* Use new "search" start rate */ 2357 index = tbl->rate.index; 2358 2359 rs_dump_rate(mvm, &tbl->rate, 2360 "Switch to SEARCH TABLE:"); 2361 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2362 } else { 2363 done_search = 1; 2364 } 2365 } 2366 2367 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) { 2368 /* If the "active" (non-search) mode was legacy, 2369 * and we've tried switching antennas, 2370 * but we haven't been able to try HT modes (not available), 2371 * stay with best antenna legacy modulation for a while 2372 * before next round of mode comparisons. */ 2373 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]); 2374 if (is_legacy(&tbl1->rate)) { 2375 IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n"); 2376 2377 if (tid != IWL_MAX_TID_COUNT) { 2378 tid_data = &sta_priv->tid_data[tid]; 2379 if (tid_data->state != IWL_AGG_OFF) { 2380 IWL_DEBUG_RATE(mvm, 2381 "Stop aggregation on tid %d\n", 2382 tid); 2383 ieee80211_stop_tx_ba_session(sta, tid); 2384 } 2385 } 2386 rs_set_stay_in_table(mvm, 1, lq_sta); 2387 } else { 2388 /* If we're in an HT mode, and all 3 mode switch actions 2389 * have been tried and compared, stay in this best modulation 2390 * mode for a while before next round of mode comparisons. */ 2391 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) && 2392 (lq_sta->tx_agg_tid_en & (1 << tid)) && 2393 (tid != IWL_MAX_TID_COUNT)) { 2394 tid_data = &sta_priv->tid_data[tid]; 2395 if (tid_data->state == IWL_AGG_OFF) { 2396 IWL_DEBUG_RATE(mvm, 2397 "try to aggregate tid %d\n", 2398 tid); 2399 rs_tl_turn_on_agg(mvm, tid, 2400 lq_sta, sta); 2401 } 2402 } 2403 rs_set_stay_in_table(mvm, 0, lq_sta); 2404 } 2405 } 2406 2407out: 2408 lq_sta->last_txrate_idx = index; 2409} 2410 2411struct rs_init_rate_info { 2412 s8 rssi; 2413 u8 rate_idx; 2414}; 2415 2416static const struct rs_init_rate_info rs_init_rates_24ghz[] = { 2417 { -60, IWL_RATE_54M_INDEX }, 2418 { -64, IWL_RATE_48M_INDEX }, 2419 { -68, IWL_RATE_36M_INDEX }, 2420 { -80, IWL_RATE_24M_INDEX }, 2421 { -84, IWL_RATE_18M_INDEX }, 2422 { -85, IWL_RATE_12M_INDEX }, 2423 { -86, IWL_RATE_11M_INDEX }, 2424 { -88, IWL_RATE_5M_INDEX }, 2425 { -90, IWL_RATE_2M_INDEX }, 2426 { S8_MIN, IWL_RATE_1M_INDEX }, 2427}; 2428 2429static const struct rs_init_rate_info rs_init_rates_5ghz[] = { 2430 { -60, IWL_RATE_54M_INDEX }, 2431 { -64, IWL_RATE_48M_INDEX }, 2432 { -72, IWL_RATE_36M_INDEX }, 2433 { -80, IWL_RATE_24M_INDEX }, 2434 { -84, IWL_RATE_18M_INDEX }, 2435 { -85, IWL_RATE_12M_INDEX }, 2436 { -87, IWL_RATE_9M_INDEX }, 2437 { S8_MIN, IWL_RATE_6M_INDEX }, 2438}; 2439 2440/* Choose an initial legacy rate and antenna to use based on the RSSI 2441 * of last Rx 2442 */ 2443static void rs_get_initial_rate(struct iwl_mvm *mvm, 2444 struct iwl_lq_sta *lq_sta, 2445 enum ieee80211_band band, 2446 struct rs_rate *rate) 2447{ 2448 int i, nentries; 2449 s8 best_rssi = S8_MIN; 2450 u8 best_ant = ANT_NONE; 2451 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 2452 const struct rs_init_rate_info *initial_rates; 2453 2454 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { 2455 if (!(lq_sta->pers.chains & BIT(i))) 2456 continue; 2457 2458 if (lq_sta->pers.chain_signal[i] > best_rssi) { 2459 best_rssi = lq_sta->pers.chain_signal[i]; 2460 best_ant = BIT(i); 2461 } 2462 } 2463 2464 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n", 2465 rs_pretty_ant(best_ant), best_rssi); 2466 2467 if (best_ant != ANT_A && best_ant != ANT_B) 2468 rate->ant = first_antenna(valid_tx_ant); 2469 else 2470 rate->ant = best_ant; 2471 2472 rate->sgi = false; 2473 rate->ldpc = false; 2474 rate->bw = RATE_MCS_CHAN_WIDTH_20; 2475 2476 rate->index = find_first_bit(&lq_sta->active_legacy_rate, 2477 BITS_PER_LONG); 2478 2479 if (band == IEEE80211_BAND_5GHZ) { 2480 rate->type = LQ_LEGACY_A; 2481 initial_rates = rs_init_rates_5ghz; 2482 nentries = ARRAY_SIZE(rs_init_rates_5ghz); 2483 } else { 2484 rate->type = LQ_LEGACY_G; 2485 initial_rates = rs_init_rates_24ghz; 2486 nentries = ARRAY_SIZE(rs_init_rates_24ghz); 2487 } 2488 2489 if (IWL_MVM_RS_RSSI_BASED_INIT_RATE) { 2490 for (i = 0; i < nentries; i++) { 2491 int rate_idx = initial_rates[i].rate_idx; 2492 if ((best_rssi >= initial_rates[i].rssi) && 2493 (BIT(rate_idx) & lq_sta->active_legacy_rate)) { 2494 rate->index = rate_idx; 2495 break; 2496 } 2497 } 2498 } 2499 2500 IWL_DEBUG_RATE(mvm, "rate_idx %d ANT %s\n", rate->index, 2501 rs_pretty_ant(rate->ant)); 2502} 2503 2504/* Save info about RSSI of last Rx */ 2505void rs_update_last_rssi(struct iwl_mvm *mvm, 2506 struct iwl_lq_sta *lq_sta, 2507 struct ieee80211_rx_status *rx_status) 2508{ 2509 lq_sta->pers.chains = rx_status->chains; 2510 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0]; 2511 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1]; 2512 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2]; 2513} 2514 2515/** 2516 * rs_initialize_lq - Initialize a station's hardware rate table 2517 * 2518 * The uCode's station table contains a table of fallback rates 2519 * for automatic fallback during transmission. 2520 * 2521 * NOTE: This sets up a default set of values. These will be replaced later 2522 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of 2523 * rc80211_simple. 2524 * 2525 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before 2526 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD, 2527 * which requires station table entry to exist). 2528 */ 2529static void rs_initialize_lq(struct iwl_mvm *mvm, 2530 struct ieee80211_sta *sta, 2531 struct iwl_lq_sta *lq_sta, 2532 enum ieee80211_band band, 2533 bool init) 2534{ 2535 struct iwl_scale_tbl_info *tbl; 2536 struct rs_rate *rate; 2537 u8 active_tbl = 0; 2538 2539 if (!sta || !lq_sta) 2540 return; 2541 2542 if (!lq_sta->search_better_tbl) 2543 active_tbl = lq_sta->active_tbl; 2544 else 2545 active_tbl = 1 - lq_sta->active_tbl; 2546 2547 tbl = &(lq_sta->lq_info[active_tbl]); 2548 rate = &tbl->rate; 2549 2550 rs_get_initial_rate(mvm, lq_sta, band, rate); 2551 lq_sta->last_txrate_idx = rate->index; 2552 2553 WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B); 2554 if (rate->ant == ANT_A) 2555 tbl->column = RS_COLUMN_LEGACY_ANT_A; 2556 else 2557 tbl->column = RS_COLUMN_LEGACY_ANT_B; 2558 2559 rs_set_expected_tpt_table(lq_sta, tbl); 2560 rs_fill_lq_cmd(mvm, sta, lq_sta, rate); 2561 /* TODO restore station should remember the lq cmd */ 2562 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init); 2563} 2564 2565static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta, 2566 struct ieee80211_tx_rate_control *txrc) 2567{ 2568 struct sk_buff *skb = txrc->skb; 2569 struct iwl_op_mode *op_mode __maybe_unused = 2570 (struct iwl_op_mode *)mvm_r; 2571 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 2572 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2573 struct iwl_lq_sta *lq_sta = mvm_sta; 2574 2575 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) { 2576 /* if vif isn't initialized mvm doesn't know about 2577 * this station, so don't do anything with the it 2578 */ 2579 sta = NULL; 2580 mvm_sta = NULL; 2581 } 2582 2583 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2584 2585 /* Treat uninitialized rate scaling data same as non-existing. */ 2586 if (lq_sta && !lq_sta->pers.drv) { 2587 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n"); 2588 mvm_sta = NULL; 2589 } 2590 2591 /* Send management frames and NO_ACK data using lowest rate. */ 2592 if (rate_control_send_low(sta, mvm_sta, txrc)) 2593 return; 2594 2595 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags, 2596 info->band, &info->control.rates[0]); 2597 2598 info->control.rates[0].count = 1; 2599} 2600 2601static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta, 2602 gfp_t gfp) 2603{ 2604 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta); 2605 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate; 2606 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 2607 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta; 2608 2609 IWL_DEBUG_RATE(mvm, "create station rate scale window\n"); 2610 2611 lq_sta->pers.drv = mvm; 2612#ifdef CONFIG_MAC80211_DEBUGFS 2613 lq_sta->pers.dbg_fixed_rate = 0; 2614 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID; 2615 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 2616#endif 2617 lq_sta->pers.chains = 0; 2618 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal)); 2619 2620 return &sta_priv->lq_sta; 2621} 2622 2623static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap, 2624 int nss) 2625{ 2626 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) & 2627 (0x3 << (2 * (nss - 1))); 2628 rx_mcs >>= (2 * (nss - 1)); 2629 2630 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7) 2631 return IWL_RATE_MCS_7_INDEX; 2632 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8) 2633 return IWL_RATE_MCS_8_INDEX; 2634 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9) 2635 return IWL_RATE_MCS_9_INDEX; 2636 2637 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED); 2638 return -1; 2639} 2640 2641static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta, 2642 struct ieee80211_sta_vht_cap *vht_cap, 2643 struct iwl_lq_sta *lq_sta) 2644{ 2645 int i; 2646 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1); 2647 2648 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 2649 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 2650 if (i == IWL_RATE_9M_INDEX) 2651 continue; 2652 2653 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 2654 if (i == IWL_RATE_MCS_9_INDEX && 2655 sta->bandwidth == IEEE80211_STA_RX_BW_20) 2656 continue; 2657 2658 lq_sta->active_siso_rate |= BIT(i); 2659 } 2660 } 2661 2662 if (sta->rx_nss < 2) 2663 return; 2664 2665 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2); 2666 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 2667 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 2668 if (i == IWL_RATE_9M_INDEX) 2669 continue; 2670 2671 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 2672 if (i == IWL_RATE_MCS_9_INDEX && 2673 sta->bandwidth == IEEE80211_STA_RX_BW_20) 2674 continue; 2675 2676 lq_sta->active_mimo2_rate |= BIT(i); 2677 } 2678 } 2679} 2680 2681static void rs_ht_init(struct iwl_mvm *mvm, 2682 struct ieee80211_sta *sta, 2683 struct iwl_lq_sta *lq_sta, 2684 struct ieee80211_sta_ht_cap *ht_cap) 2685{ 2686 /* active_siso_rate mask includes 9 MBits (bit 5), 2687 * and CCK (bits 0-3), supp_rates[] does not; 2688 * shift to convert format, force 9 MBits off. 2689 */ 2690 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1; 2691 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1; 2692 lq_sta->active_siso_rate &= ~((u16)0x2); 2693 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE; 2694 2695 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1; 2696 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1; 2697 lq_sta->active_mimo2_rate &= ~((u16)0x2); 2698 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE; 2699 2700 if (mvm->cfg->ht_params->ldpc && 2701 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING)) 2702 lq_sta->ldpc = true; 2703 2704 if (mvm->cfg->ht_params->stbc && 2705 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 2706 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC)) 2707 lq_sta->stbc_capable = true; 2708 2709 lq_sta->is_vht = false; 2710} 2711 2712static void rs_vht_init(struct iwl_mvm *mvm, 2713 struct ieee80211_sta *sta, 2714 struct iwl_lq_sta *lq_sta, 2715 struct ieee80211_sta_vht_cap *vht_cap) 2716{ 2717 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta); 2718 2719 if (mvm->cfg->ht_params->ldpc && 2720 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC)) 2721 lq_sta->ldpc = true; 2722 2723 if (mvm->cfg->ht_params->stbc && 2724 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 2725 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK)) 2726 lq_sta->stbc_capable = true; 2727 2728 if ((mvm->fw->ucode_capa.capa[0] & IWL_UCODE_TLV_CAPA_BEAMFORMER) && 2729 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 2730 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE)) 2731 lq_sta->bfer_capable = true; 2732 2733 lq_sta->is_vht = true; 2734} 2735 2736#ifdef CONFIG_IWLWIFI_DEBUGFS 2737static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm) 2738{ 2739 spin_lock_bh(&mvm->drv_stats_lock); 2740 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats)); 2741 spin_unlock_bh(&mvm->drv_stats_lock); 2742} 2743 2744void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg) 2745{ 2746 u8 nss = 0, mcs = 0; 2747 2748 spin_lock(&mvm->drv_stats_lock); 2749 2750 if (agg) 2751 mvm->drv_rx_stats.agg_frames++; 2752 2753 mvm->drv_rx_stats.success_frames++; 2754 2755 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { 2756 case RATE_MCS_CHAN_WIDTH_20: 2757 mvm->drv_rx_stats.bw_20_frames++; 2758 break; 2759 case RATE_MCS_CHAN_WIDTH_40: 2760 mvm->drv_rx_stats.bw_40_frames++; 2761 break; 2762 case RATE_MCS_CHAN_WIDTH_80: 2763 mvm->drv_rx_stats.bw_80_frames++; 2764 break; 2765 default: 2766 WARN_ONCE(1, "bad BW. rate 0x%x", rate); 2767 } 2768 2769 if (rate & RATE_MCS_HT_MSK) { 2770 mvm->drv_rx_stats.ht_frames++; 2771 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK; 2772 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1; 2773 } else if (rate & RATE_MCS_VHT_MSK) { 2774 mvm->drv_rx_stats.vht_frames++; 2775 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK; 2776 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >> 2777 RATE_VHT_MCS_NSS_POS) + 1; 2778 } else { 2779 mvm->drv_rx_stats.legacy_frames++; 2780 } 2781 2782 if (nss == 1) 2783 mvm->drv_rx_stats.siso_frames++; 2784 else if (nss == 2) 2785 mvm->drv_rx_stats.mimo2_frames++; 2786 2787 if (rate & RATE_MCS_SGI_MSK) 2788 mvm->drv_rx_stats.sgi_frames++; 2789 else 2790 mvm->drv_rx_stats.ngi_frames++; 2791 2792 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate; 2793 mvm->drv_rx_stats.last_frame_idx = 2794 (mvm->drv_rx_stats.last_frame_idx + 1) % 2795 ARRAY_SIZE(mvm->drv_rx_stats.last_rates); 2796 2797 spin_unlock(&mvm->drv_stats_lock); 2798} 2799#endif 2800 2801/* 2802 * Called after adding a new station to initialize rate scaling 2803 */ 2804void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 2805 enum ieee80211_band band, bool init) 2806{ 2807 int i, j; 2808 struct ieee80211_hw *hw = mvm->hw; 2809 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 2810 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; 2811 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta); 2812 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta; 2813 struct ieee80211_supported_band *sband; 2814 unsigned long supp; /* must be unsigned long for for_each_set_bit */ 2815 2816 /* clear all non-persistent lq data */ 2817 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers)); 2818 2819 sband = hw->wiphy->bands[band]; 2820 2821 lq_sta->lq.sta_id = sta_priv->sta_id; 2822 2823 for (j = 0; j < LQ_SIZE; j++) 2824 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]); 2825 2826 lq_sta->flush_timer = 0; 2827 lq_sta->last_tx = jiffies; 2828 2829 IWL_DEBUG_RATE(mvm, 2830 "LQ: *** rate scale station global init for station %d ***\n", 2831 sta_priv->sta_id); 2832 /* TODO: what is a good starting rate for STA? About middle? Maybe not 2833 * the lowest or the highest rate.. Could consider using RSSI from 2834 * previous packets? Need to have IEEE 802.1X auth succeed immediately 2835 * after assoc.. */ 2836 2837 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX; 2838 lq_sta->band = sband->band; 2839 /* 2840 * active legacy rates as per supported rates bitmap 2841 */ 2842 supp = sta->supp_rates[sband->band]; 2843 lq_sta->active_legacy_rate = 0; 2844 for_each_set_bit(i, &supp, BITS_PER_LONG) 2845 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value); 2846 2847 /* TODO: should probably account for rx_highest for both HT/VHT */ 2848 if (!vht_cap || !vht_cap->vht_supported) 2849 rs_ht_init(mvm, sta, lq_sta, ht_cap); 2850 else 2851 rs_vht_init(mvm, sta, lq_sta, vht_cap); 2852 2853 if (IWL_MVM_RS_DISABLE_P2P_MIMO && sta_priv->vif->p2p) 2854 lq_sta->active_mimo2_rate = 0; 2855 2856 lq_sta->max_legacy_rate_idx = 2857 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate); 2858 lq_sta->max_siso_rate_idx = 2859 rs_get_max_rate_from_mask(lq_sta->active_siso_rate); 2860 lq_sta->max_mimo2_rate_idx = 2861 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate); 2862 2863 IWL_DEBUG_RATE(mvm, 2864 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n", 2865 lq_sta->active_legacy_rate, 2866 lq_sta->active_siso_rate, 2867 lq_sta->active_mimo2_rate, 2868 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable, 2869 lq_sta->bfer_capable); 2870 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n", 2871 lq_sta->max_legacy_rate_idx, 2872 lq_sta->max_siso_rate_idx, 2873 lq_sta->max_mimo2_rate_idx); 2874 2875 /* These values will be overridden later */ 2876 lq_sta->lq.single_stream_ant_msk = 2877 first_antenna(iwl_mvm_get_valid_tx_ant(mvm)); 2878 lq_sta->lq.dual_stream_ant_msk = ANT_AB; 2879 2880 /* as default allow aggregation for all tids */ 2881 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID; 2882 lq_sta->is_agg = 0; 2883#ifdef CONFIG_IWLWIFI_DEBUGFS 2884 iwl_mvm_reset_frame_stats(mvm); 2885#endif 2886 rs_initialize_lq(mvm, sta, lq_sta, band, init); 2887} 2888 2889static void rs_rate_update(void *mvm_r, 2890 struct ieee80211_supported_band *sband, 2891 struct cfg80211_chan_def *chandef, 2892 struct ieee80211_sta *sta, void *priv_sta, 2893 u32 changed) 2894{ 2895 u8 tid; 2896 struct iwl_op_mode *op_mode = 2897 (struct iwl_op_mode *)mvm_r; 2898 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 2899 2900 if (!iwl_mvm_sta_from_mac80211(sta)->vif) 2901 return; 2902 2903 /* Stop any ongoing aggregations as rs starts off assuming no agg */ 2904 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++) 2905 ieee80211_stop_tx_ba_session(sta, tid); 2906 2907 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false); 2908} 2909 2910#ifdef CONFIG_MAC80211_DEBUGFS 2911static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm, 2912 struct iwl_lq_cmd *lq_cmd, 2913 enum ieee80211_band band, 2914 u32 ucode_rate) 2915{ 2916 struct rs_rate rate; 2917 int i; 2918 int num_rates = ARRAY_SIZE(lq_cmd->rs_table); 2919 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate); 2920 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; 2921 2922 for (i = 0; i < num_rates; i++) 2923 lq_cmd->rs_table[i] = ucode_rate_le32; 2924 2925 rs_rate_from_ucode_rate(ucode_rate, band, &rate); 2926 2927 if (is_mimo(&rate)) 2928 lq_cmd->mimo_delim = num_rates - 1; 2929 else 2930 lq_cmd->mimo_delim = 0; 2931 2932 lq_cmd->reduced_tpc = 0; 2933 2934 if (num_of_ant(ant) == 1) 2935 lq_cmd->single_stream_ant_msk = ant; 2936 2937 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF; 2938} 2939#endif /* CONFIG_MAC80211_DEBUGFS */ 2940 2941static void rs_fill_rates_for_column(struct iwl_mvm *mvm, 2942 struct iwl_lq_sta *lq_sta, 2943 struct rs_rate *rate, 2944 __le32 *rs_table, int *rs_table_index, 2945 int num_rates, int num_retries, 2946 u8 valid_tx_ant, bool toggle_ant) 2947{ 2948 int i, j; 2949 __le32 ucode_rate; 2950 bool bottom_reached = false; 2951 int prev_rate_idx = rate->index; 2952 int end = LINK_QUAL_MAX_RETRY_NUM; 2953 int index = *rs_table_index; 2954 2955 for (i = 0; i < num_rates && index < end; i++) { 2956 for (j = 0; j < num_retries && index < end; j++, index++) { 2957 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm, 2958 rate)); 2959 rs_table[index] = ucode_rate; 2960 if (toggle_ant) 2961 rs_toggle_antenna(valid_tx_ant, rate); 2962 } 2963 2964 prev_rate_idx = rate->index; 2965 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate); 2966 if (bottom_reached && !is_legacy(rate)) 2967 break; 2968 } 2969 2970 if (!bottom_reached && !is_legacy(rate)) 2971 rate->index = prev_rate_idx; 2972 2973 *rs_table_index = index; 2974} 2975 2976/* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI 2977 * column the rate table should look like this: 2978 * 2979 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 2980 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 2981 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 2982 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 2983 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 2984 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 2985 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI 2986 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI 2987 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI 2988 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps 2989 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps 2990 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps 2991 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps 2992 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps 2993 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps 2994 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps 2995 */ 2996static void rs_build_rates_table(struct iwl_mvm *mvm, 2997 struct ieee80211_sta *sta, 2998 struct iwl_lq_sta *lq_sta, 2999 const struct rs_rate *initial_rate) 3000{ 3001 struct rs_rate rate; 3002 int num_rates, num_retries, index = 0; 3003 u8 valid_tx_ant = 0; 3004 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3005 bool toggle_ant = false; 3006 3007 memcpy(&rate, initial_rate, sizeof(rate)); 3008 3009 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 3010 3011 /* TODO: remove old API when min FW API hits 14 */ 3012 if (!(mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LQ_SS_PARAMS) && 3013 rs_stbc_allow(mvm, sta, lq_sta)) 3014 rate.stbc = true; 3015 3016 if (is_siso(&rate)) { 3017 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES; 3018 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3019 } else if (is_mimo(&rate)) { 3020 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES; 3021 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3022 } else { 3023 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES; 3024 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES; 3025 toggle_ant = true; 3026 } 3027 3028 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3029 num_rates, num_retries, valid_tx_ant, 3030 toggle_ant); 3031 3032 rs_get_lower_rate_down_column(lq_sta, &rate); 3033 3034 if (is_siso(&rate)) { 3035 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES; 3036 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES; 3037 lq_cmd->mimo_delim = index; 3038 } else if (is_legacy(&rate)) { 3039 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3040 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3041 } else { 3042 WARN_ON_ONCE(1); 3043 } 3044 3045 toggle_ant = true; 3046 3047 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3048 num_rates, num_retries, valid_tx_ant, 3049 toggle_ant); 3050 3051 rs_get_lower_rate_down_column(lq_sta, &rate); 3052 3053 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3054 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3055 3056 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3057 num_rates, num_retries, valid_tx_ant, 3058 toggle_ant); 3059 3060} 3061 3062struct rs_bfer_active_iter_data { 3063 struct ieee80211_sta *exclude_sta; 3064 struct iwl_mvm_sta *bfer_mvmsta; 3065}; 3066 3067static void rs_bfer_active_iter(void *_data, 3068 struct ieee80211_sta *sta) 3069{ 3070 struct rs_bfer_active_iter_data *data = _data; 3071 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3072 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq; 3073 u32 ss_params = le32_to_cpu(lq_cmd->ss_params); 3074 3075 if (sta == data->exclude_sta) 3076 return; 3077 3078 /* The current sta has BFER allowed */ 3079 if (ss_params & LQ_SS_BFER_ALLOWED) { 3080 WARN_ON_ONCE(data->bfer_mvmsta != NULL); 3081 3082 data->bfer_mvmsta = mvmsta; 3083 } 3084} 3085 3086static int rs_bfer_priority(struct iwl_mvm_sta *sta) 3087{ 3088 int prio = -1; 3089 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif); 3090 3091 switch (viftype) { 3092 case NL80211_IFTYPE_AP: 3093 case NL80211_IFTYPE_P2P_GO: 3094 prio = 3; 3095 break; 3096 case NL80211_IFTYPE_P2P_CLIENT: 3097 prio = 2; 3098 break; 3099 case NL80211_IFTYPE_STATION: 3100 prio = 1; 3101 break; 3102 default: 3103 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id); 3104 prio = -1; 3105 } 3106 3107 return prio; 3108} 3109 3110/* Returns >0 if sta1 has a higher BFER priority compared to sta2 */ 3111static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1, 3112 struct iwl_mvm_sta *sta2) 3113{ 3114 int prio1 = rs_bfer_priority(sta1); 3115 int prio2 = rs_bfer_priority(sta2); 3116 3117 if (prio1 > prio2) 3118 return 1; 3119 if (prio1 < prio2) 3120 return -1; 3121 return 0; 3122} 3123 3124static void rs_set_lq_ss_params(struct iwl_mvm *mvm, 3125 struct ieee80211_sta *sta, 3126 struct iwl_lq_sta *lq_sta, 3127 const struct rs_rate *initial_rate) 3128{ 3129 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3130 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3131 struct rs_bfer_active_iter_data data = { 3132 .exclude_sta = sta, 3133 .bfer_mvmsta = NULL, 3134 }; 3135 struct iwl_mvm_sta *bfer_mvmsta = NULL; 3136 u32 ss_params = LQ_SS_PARAMS_VALID; 3137 3138 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 3139 goto out; 3140 3141#ifdef CONFIG_MAC80211_DEBUGFS 3142 /* Check if forcing the decision is configured. 3143 * Note that SISO is forced by not allowing STBC or BFER 3144 */ 3145 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC) 3146 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE); 3147 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER) 3148 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE); 3149 3150 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) { 3151 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n", 3152 lq_sta->pers.ss_force); 3153 goto out; 3154 } 3155#endif 3156 3157 if (lq_sta->stbc_capable) 3158 ss_params |= LQ_SS_STBC_1SS_ALLOWED; 3159 3160 if (!lq_sta->bfer_capable) 3161 goto out; 3162 3163 ieee80211_iterate_stations_atomic(mvm->hw, 3164 rs_bfer_active_iter, 3165 &data); 3166 bfer_mvmsta = data.bfer_mvmsta; 3167 3168 /* This code is safe as it doesn't run concurrently for different 3169 * stations. This is guaranteed by the fact that calls to 3170 * ieee80211_tx_status wouldn't run concurrently for a single HW. 3171 */ 3172 if (!bfer_mvmsta) { 3173 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n"); 3174 3175 ss_params |= LQ_SS_BFER_ALLOWED; 3176 goto out; 3177 } 3178 3179 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n", 3180 bfer_mvmsta->sta_id); 3181 3182 /* Disallow BFER on another STA if active and we're a higher priority */ 3183 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) { 3184 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq; 3185 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params); 3186 3187 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED; 3188 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params); 3189 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false); 3190 3191 ss_params |= LQ_SS_BFER_ALLOWED; 3192 IWL_DEBUG_RATE(mvm, 3193 "Lower priority BFER sta found (%d). Switch BFER\n", 3194 bfer_mvmsta->sta_id); 3195 } 3196out: 3197 lq_cmd->ss_params = cpu_to_le32(ss_params); 3198} 3199 3200static void rs_fill_lq_cmd(struct iwl_mvm *mvm, 3201 struct ieee80211_sta *sta, 3202 struct iwl_lq_sta *lq_sta, 3203 const struct rs_rate *initial_rate) 3204{ 3205 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3206 struct iwl_mvm_sta *mvmsta; 3207 struct iwl_mvm_vif *mvmvif; 3208 3209 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START; 3210 lq_cmd->agg_time_limit = 3211 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT); 3212 3213#ifdef CONFIG_MAC80211_DEBUGFS 3214 if (lq_sta->pers.dbg_fixed_rate) { 3215 rs_build_rates_table_from_fixed(mvm, lq_cmd, 3216 lq_sta->band, 3217 lq_sta->pers.dbg_fixed_rate); 3218 return; 3219 } 3220#endif 3221 if (WARN_ON_ONCE(!sta || !initial_rate)) 3222 return; 3223 3224 rs_build_rates_table(mvm, sta, lq_sta, initial_rate); 3225 3226 if (mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LQ_SS_PARAMS) 3227 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate); 3228 3229 if (num_of_ant(initial_rate->ant) == 1) 3230 lq_cmd->single_stream_ant_msk = initial_rate->ant; 3231 3232 mvmsta = iwl_mvm_sta_from_mac80211(sta); 3233 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif); 3234 3235 if (num_of_ant(initial_rate->ant) == 1) 3236 lq_cmd->single_stream_ant_msk = initial_rate->ant; 3237 3238 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize; 3239 3240 /* 3241 * In case of low latency, tell the firmware to leave a frame in the 3242 * Tx Fifo so that it can start a transaction in the same TxOP. This 3243 * basically allows the firmware to send bursts. 3244 */ 3245 if (iwl_mvm_vif_low_latency(mvmvif)) { 3246 lq_cmd->agg_frame_cnt_limit--; 3247 3248 if (mvm->low_latency_agg_frame_limit) 3249 lq_cmd->agg_frame_cnt_limit = 3250 min(lq_cmd->agg_frame_cnt_limit, 3251 mvm->low_latency_agg_frame_limit); 3252 } 3253 3254 if (mvmsta->vif->p2p) 3255 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK; 3256 3257 lq_cmd->agg_time_limit = 3258 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta)); 3259} 3260 3261static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) 3262{ 3263 return hw->priv; 3264} 3265/* rate scale requires free function to be implemented */ 3266static void rs_free(void *mvm_rate) 3267{ 3268 return; 3269} 3270 3271static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, 3272 void *mvm_sta) 3273{ 3274 struct iwl_op_mode *op_mode __maybe_unused = mvm_r; 3275 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 3276 3277 IWL_DEBUG_RATE(mvm, "enter\n"); 3278 IWL_DEBUG_RATE(mvm, "leave\n"); 3279} 3280 3281#ifdef CONFIG_MAC80211_DEBUGFS 3282int rs_pretty_print_rate(char *buf, const u32 rate) 3283{ 3284 3285 char *type, *bw; 3286 u8 mcs = 0, nss = 0; 3287 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; 3288 3289 if (!(rate & RATE_MCS_HT_MSK) && 3290 !(rate & RATE_MCS_VHT_MSK)) { 3291 int index = iwl_hwrate_to_plcp_idx(rate); 3292 3293 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n", 3294 rs_pretty_ant(ant), 3295 index == IWL_RATE_INVALID ? "BAD" : 3296 iwl_rate_mcs[index].mbps); 3297 } 3298 3299 if (rate & RATE_MCS_VHT_MSK) { 3300 type = "VHT"; 3301 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK; 3302 nss = ((rate & RATE_VHT_MCS_NSS_MSK) 3303 >> RATE_VHT_MCS_NSS_POS) + 1; 3304 } else if (rate & RATE_MCS_HT_MSK) { 3305 type = "HT"; 3306 mcs = rate & RATE_HT_MCS_INDEX_MSK; 3307 } else { 3308 type = "Unknown"; /* shouldn't happen */ 3309 } 3310 3311 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { 3312 case RATE_MCS_CHAN_WIDTH_20: 3313 bw = "20Mhz"; 3314 break; 3315 case RATE_MCS_CHAN_WIDTH_40: 3316 bw = "40Mhz"; 3317 break; 3318 case RATE_MCS_CHAN_WIDTH_80: 3319 bw = "80Mhz"; 3320 break; 3321 case RATE_MCS_CHAN_WIDTH_160: 3322 bw = "160Mhz"; 3323 break; 3324 default: 3325 bw = "BAD BW"; 3326 } 3327 3328 return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n", 3329 type, rs_pretty_ant(ant), bw, mcs, nss, 3330 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ", 3331 (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "", 3332 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "", 3333 (rate & RATE_MCS_BF_MSK) ? "BF " : "", 3334 (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : ""); 3335} 3336 3337/** 3338 * Program the device to use fixed rate for frame transmit 3339 * This is for debugging/testing only 3340 * once the device start use fixed rate, we need to reload the module 3341 * to being back the normal operation. 3342 */ 3343static void rs_program_fix_rate(struct iwl_mvm *mvm, 3344 struct iwl_lq_sta *lq_sta) 3345{ 3346 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */ 3347 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3348 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3349 3350 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n", 3351 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate); 3352 3353 if (lq_sta->pers.dbg_fixed_rate) { 3354 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL); 3355 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false); 3356 } 3357} 3358 3359static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file, 3360 const char __user *user_buf, size_t count, loff_t *ppos) 3361{ 3362 struct iwl_lq_sta *lq_sta = file->private_data; 3363 struct iwl_mvm *mvm; 3364 char buf[64]; 3365 size_t buf_size; 3366 u32 parsed_rate; 3367 3368 mvm = lq_sta->pers.drv; 3369 memset(buf, 0, sizeof(buf)); 3370 buf_size = min(count, sizeof(buf) - 1); 3371 if (copy_from_user(buf, user_buf, buf_size)) 3372 return -EFAULT; 3373 3374 if (sscanf(buf, "%x", &parsed_rate) == 1) 3375 lq_sta->pers.dbg_fixed_rate = parsed_rate; 3376 else 3377 lq_sta->pers.dbg_fixed_rate = 0; 3378 3379 rs_program_fix_rate(mvm, lq_sta); 3380 3381 return count; 3382} 3383 3384static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file, 3385 char __user *user_buf, size_t count, loff_t *ppos) 3386{ 3387 char *buff; 3388 int desc = 0; 3389 int i = 0; 3390 ssize_t ret; 3391 3392 struct iwl_lq_sta *lq_sta = file->private_data; 3393 struct iwl_mvm *mvm; 3394 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 3395 struct rs_rate *rate = &tbl->rate; 3396 u32 ss_params; 3397 mvm = lq_sta->pers.drv; 3398 buff = kmalloc(2048, GFP_KERNEL); 3399 if (!buff) 3400 return -ENOMEM; 3401 3402 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id); 3403 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n", 3404 lq_sta->total_failed, lq_sta->total_success, 3405 lq_sta->active_legacy_rate); 3406 desc += sprintf(buff+desc, "fixed rate 0x%X\n", 3407 lq_sta->pers.dbg_fixed_rate); 3408 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n", 3409 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "", 3410 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "", 3411 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : ""); 3412 desc += sprintf(buff+desc, "lq type %s\n", 3413 (is_legacy(rate)) ? "legacy" : 3414 is_vht(rate) ? "VHT" : "HT"); 3415 if (!is_legacy(rate)) { 3416 desc += sprintf(buff + desc, " %s", 3417 (is_siso(rate)) ? "SISO" : "MIMO2"); 3418 desc += sprintf(buff + desc, " %s", 3419 (is_ht20(rate)) ? "20MHz" : 3420 (is_ht40(rate)) ? "40MHz" : 3421 (is_ht80(rate)) ? "80Mhz" : "BAD BW"); 3422 desc += sprintf(buff + desc, " %s %s %s\n", 3423 (rate->sgi) ? "SGI" : "NGI", 3424 (rate->ldpc) ? "LDPC" : "BCC", 3425 (lq_sta->is_agg) ? "AGG on" : ""); 3426 } 3427 desc += sprintf(buff+desc, "last tx rate=0x%X\n", 3428 lq_sta->last_rate_n_flags); 3429 desc += sprintf(buff+desc, 3430 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n", 3431 lq_sta->lq.flags, 3432 lq_sta->lq.mimo_delim, 3433 lq_sta->lq.single_stream_ant_msk, 3434 lq_sta->lq.dual_stream_ant_msk); 3435 3436 desc += sprintf(buff+desc, 3437 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n", 3438 le16_to_cpu(lq_sta->lq.agg_time_limit), 3439 lq_sta->lq.agg_disable_start_th, 3440 lq_sta->lq.agg_frame_cnt_limit); 3441 3442 desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc); 3443 ss_params = le32_to_cpu(lq_sta->lq.ss_params); 3444 desc += sprintf(buff+desc, "single stream params: %s%s%s%s\n", 3445 (ss_params & LQ_SS_PARAMS_VALID) ? 3446 "VALID" : "INVALID", 3447 (ss_params & LQ_SS_BFER_ALLOWED) ? 3448 ", BFER" : "", 3449 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ? 3450 ", STBC" : "", 3451 (ss_params & LQ_SS_FORCE) ? 3452 ", FORCE" : ""); 3453 desc += sprintf(buff+desc, 3454 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n", 3455 lq_sta->lq.initial_rate_index[0], 3456 lq_sta->lq.initial_rate_index[1], 3457 lq_sta->lq.initial_rate_index[2], 3458 lq_sta->lq.initial_rate_index[3]); 3459 3460 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) { 3461 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]); 3462 3463 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r); 3464 desc += rs_pretty_print_rate(buff+desc, r); 3465 } 3466 3467 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3468 kfree(buff); 3469 return ret; 3470} 3471 3472static const struct file_operations rs_sta_dbgfs_scale_table_ops = { 3473 .write = rs_sta_dbgfs_scale_table_write, 3474 .read = rs_sta_dbgfs_scale_table_read, 3475 .open = simple_open, 3476 .llseek = default_llseek, 3477}; 3478static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file, 3479 char __user *user_buf, size_t count, loff_t *ppos) 3480{ 3481 char *buff; 3482 int desc = 0; 3483 int i, j; 3484 ssize_t ret; 3485 struct iwl_scale_tbl_info *tbl; 3486 struct rs_rate *rate; 3487 struct iwl_lq_sta *lq_sta = file->private_data; 3488 3489 buff = kmalloc(1024, GFP_KERNEL); 3490 if (!buff) 3491 return -ENOMEM; 3492 3493 for (i = 0; i < LQ_SIZE; i++) { 3494 tbl = &(lq_sta->lq_info[i]); 3495 rate = &tbl->rate; 3496 desc += sprintf(buff+desc, 3497 "%s type=%d SGI=%d BW=%s DUP=0\n" 3498 "index=%d\n", 3499 lq_sta->active_tbl == i ? "*" : "x", 3500 rate->type, 3501 rate->sgi, 3502 is_ht20(rate) ? "20Mhz" : 3503 is_ht40(rate) ? "40Mhz" : 3504 is_ht80(rate) ? "80Mhz" : "ERR", 3505 rate->index); 3506 for (j = 0; j < IWL_RATE_COUNT; j++) { 3507 desc += sprintf(buff+desc, 3508 "counter=%d success=%d %%=%d\n", 3509 tbl->win[j].counter, 3510 tbl->win[j].success_counter, 3511 tbl->win[j].success_ratio); 3512 } 3513 } 3514 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3515 kfree(buff); 3516 return ret; 3517} 3518 3519static const struct file_operations rs_sta_dbgfs_stats_table_ops = { 3520 .read = rs_sta_dbgfs_stats_table_read, 3521 .open = simple_open, 3522 .llseek = default_llseek, 3523}; 3524 3525static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file, 3526 char __user *user_buf, 3527 size_t count, loff_t *ppos) 3528{ 3529 static const char * const column_name[] = { 3530 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A", 3531 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B", 3532 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A", 3533 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B", 3534 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI", 3535 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI", 3536 [RS_COLUMN_MIMO2] = "MIMO2", 3537 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI", 3538 }; 3539 3540 static const char * const rate_name[] = { 3541 [IWL_RATE_1M_INDEX] = "1M", 3542 [IWL_RATE_2M_INDEX] = "2M", 3543 [IWL_RATE_5M_INDEX] = "5.5M", 3544 [IWL_RATE_11M_INDEX] = "11M", 3545 [IWL_RATE_6M_INDEX] = "6M|MCS0", 3546 [IWL_RATE_9M_INDEX] = "9M", 3547 [IWL_RATE_12M_INDEX] = "12M|MCS1", 3548 [IWL_RATE_18M_INDEX] = "18M|MCS2", 3549 [IWL_RATE_24M_INDEX] = "24M|MCS3", 3550 [IWL_RATE_36M_INDEX] = "36M|MCS4", 3551 [IWL_RATE_48M_INDEX] = "48M|MCS5", 3552 [IWL_RATE_54M_INDEX] = "54M|MCS6", 3553 [IWL_RATE_MCS_7_INDEX] = "MCS7", 3554 [IWL_RATE_MCS_8_INDEX] = "MCS8", 3555 [IWL_RATE_MCS_9_INDEX] = "MCS9", 3556 }; 3557 3558 char *buff, *pos, *endpos; 3559 int col, rate; 3560 ssize_t ret; 3561 struct iwl_lq_sta *lq_sta = file->private_data; 3562 struct rs_rate_stats *stats; 3563 static const size_t bufsz = 1024; 3564 3565 buff = kmalloc(bufsz, GFP_KERNEL); 3566 if (!buff) 3567 return -ENOMEM; 3568 3569 pos = buff; 3570 endpos = pos + bufsz; 3571 3572 pos += scnprintf(pos, endpos - pos, "COLUMN,"); 3573 for (rate = 0; rate < IWL_RATE_COUNT; rate++) 3574 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]); 3575 pos += scnprintf(pos, endpos - pos, "\n"); 3576 3577 for (col = 0; col < RS_COLUMN_COUNT; col++) { 3578 pos += scnprintf(pos, endpos - pos, 3579 "%s,", column_name[col]); 3580 3581 for (rate = 0; rate < IWL_RATE_COUNT; rate++) { 3582 stats = &(lq_sta->pers.tx_stats[col][rate]); 3583 pos += scnprintf(pos, endpos - pos, 3584 "%llu/%llu,", 3585 stats->success, 3586 stats->total); 3587 } 3588 pos += scnprintf(pos, endpos - pos, "\n"); 3589 } 3590 3591 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff); 3592 kfree(buff); 3593 return ret; 3594} 3595 3596static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file, 3597 const char __user *user_buf, 3598 size_t count, loff_t *ppos) 3599{ 3600 struct iwl_lq_sta *lq_sta = file->private_data; 3601 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats)); 3602 3603 return count; 3604} 3605 3606static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = { 3607 .read = rs_sta_dbgfs_drv_tx_stats_read, 3608 .write = rs_sta_dbgfs_drv_tx_stats_write, 3609 .open = simple_open, 3610 .llseek = default_llseek, 3611}; 3612 3613static ssize_t iwl_dbgfs_ss_force_read(struct file *file, 3614 char __user *user_buf, 3615 size_t count, loff_t *ppos) 3616{ 3617 struct iwl_lq_sta *lq_sta = file->private_data; 3618 char buf[12]; 3619 int bufsz = sizeof(buf); 3620 int pos = 0; 3621 static const char * const ss_force_name[] = { 3622 [RS_SS_FORCE_NONE] = "none", 3623 [RS_SS_FORCE_STBC] = "stbc", 3624 [RS_SS_FORCE_BFER] = "bfer", 3625 [RS_SS_FORCE_SISO] = "siso", 3626 }; 3627 3628 pos += scnprintf(buf+pos, bufsz-pos, "%s\n", 3629 ss_force_name[lq_sta->pers.ss_force]); 3630 return simple_read_from_buffer(user_buf, count, ppos, buf, pos); 3631} 3632 3633static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf, 3634 size_t count, loff_t *ppos) 3635{ 3636 struct iwl_mvm *mvm = lq_sta->pers.drv; 3637 int ret = 0; 3638 3639 if (!strncmp("none", buf, 4)) { 3640 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 3641 } else if (!strncmp("siso", buf, 4)) { 3642 lq_sta->pers.ss_force = RS_SS_FORCE_SISO; 3643 } else if (!strncmp("stbc", buf, 4)) { 3644 if (lq_sta->stbc_capable) { 3645 lq_sta->pers.ss_force = RS_SS_FORCE_STBC; 3646 } else { 3647 IWL_ERR(mvm, 3648 "can't force STBC. peer doesn't support\n"); 3649 ret = -EINVAL; 3650 } 3651 } else if (!strncmp("bfer", buf, 4)) { 3652 if (lq_sta->bfer_capable) { 3653 lq_sta->pers.ss_force = RS_SS_FORCE_BFER; 3654 } else { 3655 IWL_ERR(mvm, 3656 "can't force BFER. peer doesn't support\n"); 3657 ret = -EINVAL; 3658 } 3659 } else { 3660 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n"); 3661 ret = -EINVAL; 3662 } 3663 return ret ?: count; 3664} 3665 3666#define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \ 3667 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta) 3668#define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \ 3669 if (!debugfs_create_file(#name, mode, parent, lq_sta, \ 3670 &iwl_dbgfs_##name##_ops)) \ 3671 goto err; \ 3672 } while (0) 3673 3674MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32); 3675 3676static void rs_add_debugfs(void *mvm, void *priv_sta, struct dentry *dir) 3677{ 3678 struct iwl_lq_sta *lq_sta = priv_sta; 3679 struct iwl_mvm_sta *mvmsta; 3680 3681 mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta); 3682 3683 if (!mvmsta->vif) 3684 return; 3685 3686 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir, 3687 lq_sta, &rs_sta_dbgfs_scale_table_ops); 3688 debugfs_create_file("rate_stats_table", S_IRUSR, dir, 3689 lq_sta, &rs_sta_dbgfs_stats_table_ops); 3690 debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir, 3691 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops); 3692 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir, 3693 &lq_sta->tx_agg_tid_en); 3694 debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir, 3695 &lq_sta->pers.dbg_fixed_txp_reduction); 3696 3697 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR); 3698 return; 3699err: 3700 IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n"); 3701} 3702 3703static void rs_remove_debugfs(void *mvm, void *mvm_sta) 3704{ 3705} 3706#endif 3707 3708/* 3709 * Initialization of rate scaling information is done by driver after 3710 * the station is added. Since mac80211 calls this function before a 3711 * station is added we ignore it. 3712 */ 3713static void rs_rate_init_stub(void *mvm_r, 3714 struct ieee80211_supported_band *sband, 3715 struct cfg80211_chan_def *chandef, 3716 struct ieee80211_sta *sta, void *mvm_sta) 3717{ 3718} 3719 3720static const struct rate_control_ops rs_mvm_ops = { 3721 .name = RS_NAME, 3722 .tx_status = rs_mac80211_tx_status, 3723 .get_rate = rs_get_rate, 3724 .rate_init = rs_rate_init_stub, 3725 .alloc = rs_alloc, 3726 .free = rs_free, 3727 .alloc_sta = rs_alloc_sta, 3728 .free_sta = rs_free_sta, 3729 .rate_update = rs_rate_update, 3730#ifdef CONFIG_MAC80211_DEBUGFS 3731 .add_sta_debugfs = rs_add_debugfs, 3732 .remove_sta_debugfs = rs_remove_debugfs, 3733#endif 3734}; 3735 3736int iwl_mvm_rate_control_register(void) 3737{ 3738 return ieee80211_rate_control_register(&rs_mvm_ops); 3739} 3740 3741void iwl_mvm_rate_control_unregister(void) 3742{ 3743 ieee80211_rate_control_unregister(&rs_mvm_ops); 3744} 3745 3746/** 3747 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable 3748 * Tx protection, according to this request and previous requests, 3749 * and send the LQ command. 3750 * @mvmsta: The station 3751 * @enable: Enable Tx protection? 3752 */ 3753int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 3754 bool enable) 3755{ 3756 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq; 3757 3758 lockdep_assert_held(&mvm->mutex); 3759 3760 if (enable) { 3761 if (mvmsta->tx_protection == 0) 3762 lq->flags |= LQ_FLAG_USE_RTS_MSK; 3763 mvmsta->tx_protection++; 3764 } else { 3765 mvmsta->tx_protection--; 3766 if (mvmsta->tx_protection == 0) 3767 lq->flags &= ~LQ_FLAG_USE_RTS_MSK; 3768 } 3769 3770 return iwl_mvm_send_lq_cmd(mvm, lq, false); 3771} 3772