1 /****************************************************************************** 2 * 3 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved. 4 * Copyright(c) 2013 - 2015 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 <linuxwifi@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 53 static 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 66 static 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 */ 103 static 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 }; 120 121 enum rs_action { 122 RS_ACTION_STAY = 0, 123 RS_ACTION_DOWNSCALE = -1, 124 RS_ACTION_UPSCALE = 1, 125 }; 126 127 enum 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 3 136 137 struct rs_tx_column; 138 139 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm, 140 struct ieee80211_sta *sta, 141 struct rs_rate *rate, 142 const struct rs_tx_column *next_col); 143 144 struct 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 }; 151 152 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 153 struct rs_rate *rate, 154 const struct rs_tx_column *next_col) 155 { 156 return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant); 157 } 158 159 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 160 struct rs_rate *rate, 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); 180 181 if (mvm->nvm_data->sku_cap_mimo_disabled) 182 return false; 183 184 return true; 185 } 186 187 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 188 struct rs_rate *rate, 189 const struct rs_tx_column *next_col) 190 { 191 if (!sta->ht_cap.ht_supported) 192 return false; 193 194 return true; 195 } 196 197 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 198 struct rs_rate *rate, 199 const struct rs_tx_column *next_col) 200 { 201 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 202 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; 203 204 if (is_ht20(rate) && (ht_cap->cap & 205 IEEE80211_HT_CAP_SGI_20)) 206 return true; 207 if (is_ht40(rate) && (ht_cap->cap & 208 IEEE80211_HT_CAP_SGI_40)) 209 return true; 210 if (is_ht80(rate) && (vht_cap->cap & 211 IEEE80211_VHT_CAP_SHORT_GI_80)) 212 return true; 213 214 return false; 215 } 216 217 static const struct rs_tx_column rs_tx_columns[] = { 218 [RS_COLUMN_LEGACY_ANT_A] = { 219 .mode = RS_LEGACY, 220 .ant = ANT_A, 221 .next_columns = { 222 RS_COLUMN_LEGACY_ANT_B, 223 RS_COLUMN_SISO_ANT_A, 224 RS_COLUMN_MIMO2, 225 RS_COLUMN_INVALID, 226 RS_COLUMN_INVALID, 227 RS_COLUMN_INVALID, 228 RS_COLUMN_INVALID, 229 }, 230 .checks = { 231 rs_ant_allow, 232 }, 233 }, 234 [RS_COLUMN_LEGACY_ANT_B] = { 235 .mode = RS_LEGACY, 236 .ant = ANT_B, 237 .next_columns = { 238 RS_COLUMN_LEGACY_ANT_A, 239 RS_COLUMN_SISO_ANT_B, 240 RS_COLUMN_MIMO2, 241 RS_COLUMN_INVALID, 242 RS_COLUMN_INVALID, 243 RS_COLUMN_INVALID, 244 RS_COLUMN_INVALID, 245 }, 246 .checks = { 247 rs_ant_allow, 248 }, 249 }, 250 [RS_COLUMN_SISO_ANT_A] = { 251 .mode = RS_SISO, 252 .ant = ANT_A, 253 .next_columns = { 254 RS_COLUMN_SISO_ANT_B, 255 RS_COLUMN_MIMO2, 256 RS_COLUMN_SISO_ANT_A_SGI, 257 RS_COLUMN_LEGACY_ANT_A, 258 RS_COLUMN_LEGACY_ANT_B, 259 RS_COLUMN_INVALID, 260 RS_COLUMN_INVALID, 261 }, 262 .checks = { 263 rs_siso_allow, 264 rs_ant_allow, 265 }, 266 }, 267 [RS_COLUMN_SISO_ANT_B] = { 268 .mode = RS_SISO, 269 .ant = ANT_B, 270 .next_columns = { 271 RS_COLUMN_SISO_ANT_A, 272 RS_COLUMN_MIMO2, 273 RS_COLUMN_SISO_ANT_B_SGI, 274 RS_COLUMN_LEGACY_ANT_A, 275 RS_COLUMN_LEGACY_ANT_B, 276 RS_COLUMN_INVALID, 277 RS_COLUMN_INVALID, 278 }, 279 .checks = { 280 rs_siso_allow, 281 rs_ant_allow, 282 }, 283 }, 284 [RS_COLUMN_SISO_ANT_A_SGI] = { 285 .mode = RS_SISO, 286 .ant = ANT_A, 287 .sgi = true, 288 .next_columns = { 289 RS_COLUMN_SISO_ANT_B_SGI, 290 RS_COLUMN_MIMO2_SGI, 291 RS_COLUMN_SISO_ANT_A, 292 RS_COLUMN_LEGACY_ANT_A, 293 RS_COLUMN_LEGACY_ANT_B, 294 RS_COLUMN_INVALID, 295 RS_COLUMN_INVALID, 296 }, 297 .checks = { 298 rs_siso_allow, 299 rs_ant_allow, 300 rs_sgi_allow, 301 }, 302 }, 303 [RS_COLUMN_SISO_ANT_B_SGI] = { 304 .mode = RS_SISO, 305 .ant = ANT_B, 306 .sgi = true, 307 .next_columns = { 308 RS_COLUMN_SISO_ANT_A_SGI, 309 RS_COLUMN_MIMO2_SGI, 310 RS_COLUMN_SISO_ANT_B, 311 RS_COLUMN_LEGACY_ANT_A, 312 RS_COLUMN_LEGACY_ANT_B, 313 RS_COLUMN_INVALID, 314 RS_COLUMN_INVALID, 315 }, 316 .checks = { 317 rs_siso_allow, 318 rs_ant_allow, 319 rs_sgi_allow, 320 }, 321 }, 322 [RS_COLUMN_MIMO2] = { 323 .mode = RS_MIMO2, 324 .ant = ANT_AB, 325 .next_columns = { 326 RS_COLUMN_SISO_ANT_A, 327 RS_COLUMN_MIMO2_SGI, 328 RS_COLUMN_LEGACY_ANT_A, 329 RS_COLUMN_LEGACY_ANT_B, 330 RS_COLUMN_INVALID, 331 RS_COLUMN_INVALID, 332 RS_COLUMN_INVALID, 333 }, 334 .checks = { 335 rs_mimo_allow, 336 }, 337 }, 338 [RS_COLUMN_MIMO2_SGI] = { 339 .mode = RS_MIMO2, 340 .ant = ANT_AB, 341 .sgi = true, 342 .next_columns = { 343 RS_COLUMN_SISO_ANT_A_SGI, 344 RS_COLUMN_MIMO2, 345 RS_COLUMN_LEGACY_ANT_A, 346 RS_COLUMN_LEGACY_ANT_B, 347 RS_COLUMN_INVALID, 348 RS_COLUMN_INVALID, 349 RS_COLUMN_INVALID, 350 }, 351 .checks = { 352 rs_mimo_allow, 353 rs_sgi_allow, 354 }, 355 }, 356 }; 357 358 static inline u8 rs_extract_rate(u32 rate_n_flags) 359 { 360 /* also works for HT because bits 7:6 are zero there */ 361 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK); 362 } 363 364 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags) 365 { 366 int idx = 0; 367 368 if (rate_n_flags & RATE_MCS_HT_MSK) { 369 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK; 370 idx += IWL_RATE_MCS_0_INDEX; 371 372 /* skip 9M not supported in HT*/ 373 if (idx >= IWL_RATE_9M_INDEX) 374 idx += 1; 375 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE)) 376 return idx; 377 } else if (rate_n_flags & RATE_MCS_VHT_MSK) { 378 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK; 379 idx += IWL_RATE_MCS_0_INDEX; 380 381 /* skip 9M not supported in VHT*/ 382 if (idx >= IWL_RATE_9M_INDEX) 383 idx++; 384 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE)) 385 return idx; 386 } else { 387 /* legacy rate format, search for match in table */ 388 389 u8 legacy_rate = rs_extract_rate(rate_n_flags); 390 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++) 391 if (iwl_rates[idx].plcp == legacy_rate) 392 return idx; 393 } 394 395 return IWL_RATE_INVALID; 396 } 397 398 static void rs_rate_scale_perform(struct iwl_mvm *mvm, 399 struct ieee80211_sta *sta, 400 struct iwl_lq_sta *lq_sta, 401 int tid); 402 static void rs_fill_lq_cmd(struct iwl_mvm *mvm, 403 struct ieee80211_sta *sta, 404 struct iwl_lq_sta *lq_sta, 405 const struct rs_rate *initial_rate); 406 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search); 407 408 /** 409 * The following tables contain the expected throughput metrics for all rates 410 * 411 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits 412 * 413 * where invalid entries are zeros. 414 * 415 * CCK rates are only valid in legacy table and will only be used in G 416 * (2.4 GHz) band. 417 */ 418 419 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = { 420 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0 421 }; 422 423 /* Expected TpT tables. 4 indexes: 424 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI 425 */ 426 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = { 427 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0}, 428 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0}, 429 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0}, 430 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0}, 431 }; 432 433 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = { 434 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275}, 435 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280}, 436 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173}, 437 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284}, 438 }; 439 440 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = { 441 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308}, 442 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312}, 443 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466}, 444 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691}, 445 }; 446 447 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = { 448 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0}, 449 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0}, 450 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0}, 451 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0}, 452 }; 453 454 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = { 455 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300}, 456 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303}, 457 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053}, 458 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221}, 459 }; 460 461 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = { 462 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319}, 463 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320}, 464 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219}, 465 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545}, 466 }; 467 468 /* mbps, mcs */ 469 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = { 470 { "1", "BPSK DSSS"}, 471 { "2", "QPSK DSSS"}, 472 {"5.5", "BPSK CCK"}, 473 { "11", "QPSK CCK"}, 474 { "6", "BPSK 1/2"}, 475 { "9", "BPSK 1/2"}, 476 { "12", "QPSK 1/2"}, 477 { "18", "QPSK 3/4"}, 478 { "24", "16QAM 1/2"}, 479 { "36", "16QAM 3/4"}, 480 { "48", "64QAM 2/3"}, 481 { "54", "64QAM 3/4"}, 482 { "60", "64QAM 5/6"}, 483 }; 484 485 #define MCS_INDEX_PER_STREAM (8) 486 487 static const char *rs_pretty_ant(u8 ant) 488 { 489 static const char * const ant_name[] = { 490 [ANT_NONE] = "None", 491 [ANT_A] = "A", 492 [ANT_B] = "B", 493 [ANT_AB] = "AB", 494 [ANT_C] = "C", 495 [ANT_AC] = "AC", 496 [ANT_BC] = "BC", 497 [ANT_ABC] = "ABC", 498 }; 499 500 if (ant > ANT_ABC) 501 return "UNKNOWN"; 502 503 return ant_name[ant]; 504 } 505 506 static const char *rs_pretty_lq_type(enum iwl_table_type type) 507 { 508 static const char * const lq_types[] = { 509 [LQ_NONE] = "NONE", 510 [LQ_LEGACY_A] = "LEGACY_A", 511 [LQ_LEGACY_G] = "LEGACY_G", 512 [LQ_HT_SISO] = "HT SISO", 513 [LQ_HT_MIMO2] = "HT MIMO", 514 [LQ_VHT_SISO] = "VHT SISO", 515 [LQ_VHT_MIMO2] = "VHT MIMO", 516 }; 517 518 if (type < LQ_NONE || type >= LQ_MAX) 519 return "UNKNOWN"; 520 521 return lq_types[type]; 522 } 523 524 static char *rs_pretty_rate(const struct rs_rate *rate) 525 { 526 static char buf[40]; 527 static const char * const legacy_rates[] = { 528 [IWL_RATE_1M_INDEX] = "1M", 529 [IWL_RATE_2M_INDEX] = "2M", 530 [IWL_RATE_5M_INDEX] = "5.5M", 531 [IWL_RATE_11M_INDEX] = "11M", 532 [IWL_RATE_6M_INDEX] = "6M", 533 [IWL_RATE_9M_INDEX] = "9M", 534 [IWL_RATE_12M_INDEX] = "12M", 535 [IWL_RATE_18M_INDEX] = "18M", 536 [IWL_RATE_24M_INDEX] = "24M", 537 [IWL_RATE_36M_INDEX] = "36M", 538 [IWL_RATE_48M_INDEX] = "48M", 539 [IWL_RATE_54M_INDEX] = "54M", 540 }; 541 static const char *const ht_vht_rates[] = { 542 [IWL_RATE_MCS_0_INDEX] = "MCS0", 543 [IWL_RATE_MCS_1_INDEX] = "MCS1", 544 [IWL_RATE_MCS_2_INDEX] = "MCS2", 545 [IWL_RATE_MCS_3_INDEX] = "MCS3", 546 [IWL_RATE_MCS_4_INDEX] = "MCS4", 547 [IWL_RATE_MCS_5_INDEX] = "MCS5", 548 [IWL_RATE_MCS_6_INDEX] = "MCS6", 549 [IWL_RATE_MCS_7_INDEX] = "MCS7", 550 [IWL_RATE_MCS_8_INDEX] = "MCS8", 551 [IWL_RATE_MCS_9_INDEX] = "MCS9", 552 }; 553 const char *rate_str; 554 555 if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX)) 556 rate_str = legacy_rates[rate->index]; 557 else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) && 558 (rate->index <= IWL_RATE_MCS_9_INDEX)) 559 rate_str = ht_vht_rates[rate->index]; 560 else 561 rate_str = "BAD_RATE"; 562 563 sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type), 564 rs_pretty_ant(rate->ant), rate_str); 565 return buf; 566 } 567 568 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate, 569 const char *prefix) 570 { 571 IWL_DEBUG_RATE(mvm, 572 "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n", 573 prefix, rs_pretty_rate(rate), rate->bw, 574 rate->sgi, rate->ldpc, rate->stbc); 575 } 576 577 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window) 578 { 579 window->data = 0; 580 window->success_counter = 0; 581 window->success_ratio = IWL_INVALID_VALUE; 582 window->counter = 0; 583 window->average_tpt = IWL_INVALID_VALUE; 584 } 585 586 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm, 587 struct iwl_scale_tbl_info *tbl) 588 { 589 int i; 590 591 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n"); 592 for (i = 0; i < IWL_RATE_COUNT; i++) 593 rs_rate_scale_clear_window(&tbl->win[i]); 594 595 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++) 596 rs_rate_scale_clear_window(&tbl->tpc_win[i]); 597 } 598 599 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type) 600 { 601 return (ant_type & valid_antenna) == ant_type; 602 } 603 604 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm, 605 struct iwl_lq_sta *lq_data, u8 tid, 606 struct ieee80211_sta *sta) 607 { 608 int ret = -EAGAIN; 609 610 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n", 611 sta->addr, tid); 612 ret = ieee80211_start_tx_ba_session(sta, tid, 5000); 613 if (ret == -EAGAIN) { 614 /* 615 * driver and mac80211 is out of sync 616 * this might be cause by reloading firmware 617 * stop the tx ba session here 618 */ 619 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n", 620 tid); 621 ieee80211_stop_tx_ba_session(sta, tid); 622 } 623 return ret; 624 } 625 626 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid, 627 struct iwl_lq_sta *lq_data, 628 struct ieee80211_sta *sta) 629 { 630 if (tid < IWL_MAX_TID_COUNT) 631 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta); 632 else 633 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n", 634 tid, IWL_MAX_TID_COUNT); 635 } 636 637 static inline int get_num_of_ant_from_rate(u32 rate_n_flags) 638 { 639 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) + 640 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) + 641 !!(rate_n_flags & RATE_MCS_ANT_C_MSK); 642 } 643 644 /* 645 * Static function to get the expected throughput from an iwl_scale_tbl_info 646 * that wraps a NULL pointer check 647 */ 648 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index) 649 { 650 if (tbl->expected_tpt) 651 return tbl->expected_tpt[rs_index]; 652 return 0; 653 } 654 655 /** 656 * rs_collect_tx_data - Update the success/failure sliding window 657 * 658 * We keep a sliding window of the last 62 packets transmitted 659 * at this rate. window->data contains the bitmask of successful 660 * packets. 661 */ 662 static int _rs_collect_tx_data(struct iwl_mvm *mvm, 663 struct iwl_scale_tbl_info *tbl, 664 int scale_index, int attempts, int successes, 665 struct iwl_rate_scale_data *window) 666 { 667 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1)); 668 s32 fail_count, tpt; 669 670 /* Get expected throughput */ 671 tpt = get_expected_tpt(tbl, scale_index); 672 673 /* 674 * Keep track of only the latest 62 tx frame attempts in this rate's 675 * history window; anything older isn't really relevant any more. 676 * If we have filled up the sliding window, drop the oldest attempt; 677 * if the oldest attempt (highest bit in bitmap) shows "success", 678 * subtract "1" from the success counter (this is the main reason 679 * we keep these bitmaps!). 680 */ 681 while (attempts > 0) { 682 if (window->counter >= IWL_RATE_MAX_WINDOW) { 683 /* remove earliest */ 684 window->counter = IWL_RATE_MAX_WINDOW - 1; 685 686 if (window->data & mask) { 687 window->data &= ~mask; 688 window->success_counter--; 689 } 690 } 691 692 /* Increment frames-attempted counter */ 693 window->counter++; 694 695 /* Shift bitmap by one frame to throw away oldest history */ 696 window->data <<= 1; 697 698 /* Mark the most recent #successes attempts as successful */ 699 if (successes > 0) { 700 window->success_counter++; 701 window->data |= 0x1; 702 successes--; 703 } 704 705 attempts--; 706 } 707 708 /* Calculate current success ratio, avoid divide-by-0! */ 709 if (window->counter > 0) 710 window->success_ratio = 128 * (100 * window->success_counter) 711 / window->counter; 712 else 713 window->success_ratio = IWL_INVALID_VALUE; 714 715 fail_count = window->counter - window->success_counter; 716 717 /* Calculate average throughput, if we have enough history. */ 718 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) || 719 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) 720 window->average_tpt = (window->success_ratio * tpt + 64) / 128; 721 else 722 window->average_tpt = IWL_INVALID_VALUE; 723 724 return 0; 725 } 726 727 static int rs_collect_tx_data(struct iwl_mvm *mvm, 728 struct iwl_lq_sta *lq_sta, 729 struct iwl_scale_tbl_info *tbl, 730 int scale_index, int attempts, int successes, 731 u8 reduced_txp) 732 { 733 struct iwl_rate_scale_data *window = NULL; 734 int ret; 735 736 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT) 737 return -EINVAL; 738 739 if (tbl->column != RS_COLUMN_INVALID) { 740 struct lq_sta_pers *pers = &lq_sta->pers; 741 742 pers->tx_stats[tbl->column][scale_index].total += attempts; 743 pers->tx_stats[tbl->column][scale_index].success += successes; 744 } 745 746 /* Select window for current tx bit rate */ 747 window = &(tbl->win[scale_index]); 748 749 ret = _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes, 750 window); 751 if (ret) 752 return ret; 753 754 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION)) 755 return -EINVAL; 756 757 window = &tbl->tpc_win[reduced_txp]; 758 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes, 759 window); 760 } 761 762 /* Convert rs_rate object into ucode rate bitmask */ 763 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm, 764 struct rs_rate *rate) 765 { 766 u32 ucode_rate = 0; 767 int index = rate->index; 768 769 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) & 770 RATE_MCS_ANT_ABC_MSK); 771 772 if (is_legacy(rate)) { 773 ucode_rate |= iwl_rates[index].plcp; 774 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE) 775 ucode_rate |= RATE_MCS_CCK_MSK; 776 return ucode_rate; 777 } 778 779 if (is_ht(rate)) { 780 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) { 781 IWL_ERR(mvm, "Invalid HT rate index %d\n", index); 782 index = IWL_LAST_HT_RATE; 783 } 784 ucode_rate |= RATE_MCS_HT_MSK; 785 786 if (is_ht_siso(rate)) 787 ucode_rate |= iwl_rates[index].plcp_ht_siso; 788 else if (is_ht_mimo2(rate)) 789 ucode_rate |= iwl_rates[index].plcp_ht_mimo2; 790 else 791 WARN_ON_ONCE(1); 792 } else if (is_vht(rate)) { 793 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) { 794 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index); 795 index = IWL_LAST_VHT_RATE; 796 } 797 ucode_rate |= RATE_MCS_VHT_MSK; 798 if (is_vht_siso(rate)) 799 ucode_rate |= iwl_rates[index].plcp_vht_siso; 800 else if (is_vht_mimo2(rate)) 801 ucode_rate |= iwl_rates[index].plcp_vht_mimo2; 802 else 803 WARN_ON_ONCE(1); 804 805 } else { 806 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type); 807 } 808 809 if (is_siso(rate) && rate->stbc) { 810 /* To enable STBC we need to set both a flag and ANT_AB */ 811 ucode_rate |= RATE_MCS_ANT_AB_MSK; 812 ucode_rate |= RATE_MCS_VHT_STBC_MSK; 813 } 814 815 ucode_rate |= rate->bw; 816 if (rate->sgi) 817 ucode_rate |= RATE_MCS_SGI_MSK; 818 if (rate->ldpc) 819 ucode_rate |= RATE_MCS_LDPC_MSK; 820 821 return ucode_rate; 822 } 823 824 /* Convert a ucode rate into an rs_rate object */ 825 static int rs_rate_from_ucode_rate(const u32 ucode_rate, 826 enum ieee80211_band band, 827 struct rs_rate *rate) 828 { 829 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK; 830 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate); 831 u8 nss; 832 833 memset(rate, 0, sizeof(*rate)); 834 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate); 835 836 if (rate->index == IWL_RATE_INVALID) 837 return -EINVAL; 838 839 rate->ant = (ant_msk >> RATE_MCS_ANT_POS); 840 841 /* Legacy */ 842 if (!(ucode_rate & RATE_MCS_HT_MSK) && 843 !(ucode_rate & RATE_MCS_VHT_MSK)) { 844 if (num_of_ant == 1) { 845 if (band == IEEE80211_BAND_5GHZ) 846 rate->type = LQ_LEGACY_A; 847 else 848 rate->type = LQ_LEGACY_G; 849 } 850 851 return 0; 852 } 853 854 /* HT or VHT */ 855 if (ucode_rate & RATE_MCS_SGI_MSK) 856 rate->sgi = true; 857 if (ucode_rate & RATE_MCS_LDPC_MSK) 858 rate->ldpc = true; 859 if (ucode_rate & RATE_MCS_VHT_STBC_MSK) 860 rate->stbc = true; 861 if (ucode_rate & RATE_MCS_BF_MSK) 862 rate->bfer = true; 863 864 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK; 865 866 if (ucode_rate & RATE_MCS_HT_MSK) { 867 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >> 868 RATE_HT_MCS_NSS_POS) + 1; 869 870 if (nss == 1) { 871 rate->type = LQ_HT_SISO; 872 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 873 "stbc %d bfer %d", 874 rate->stbc, rate->bfer); 875 } else if (nss == 2) { 876 rate->type = LQ_HT_MIMO2; 877 WARN_ON_ONCE(num_of_ant != 2); 878 } else { 879 WARN_ON_ONCE(1); 880 } 881 } else if (ucode_rate & RATE_MCS_VHT_MSK) { 882 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >> 883 RATE_VHT_MCS_NSS_POS) + 1; 884 885 if (nss == 1) { 886 rate->type = LQ_VHT_SISO; 887 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 888 "stbc %d bfer %d", 889 rate->stbc, rate->bfer); 890 } else if (nss == 2) { 891 rate->type = LQ_VHT_MIMO2; 892 WARN_ON_ONCE(num_of_ant != 2); 893 } else { 894 WARN_ON_ONCE(1); 895 } 896 } 897 898 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160); 899 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 && 900 !is_vht(rate)); 901 902 return 0; 903 } 904 905 /* switch to another antenna/antennas and return 1 */ 906 /* if no other valid antenna found, return 0 */ 907 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate) 908 { 909 u8 new_ant_type; 910 911 if (!rate->ant || rate->ant > ANT_ABC) 912 return 0; 913 914 if (!rs_is_valid_ant(valid_ant, rate->ant)) 915 return 0; 916 917 new_ant_type = ant_toggle_lookup[rate->ant]; 918 919 while ((new_ant_type != rate->ant) && 920 !rs_is_valid_ant(valid_ant, new_ant_type)) 921 new_ant_type = ant_toggle_lookup[new_ant_type]; 922 923 if (new_ant_type == rate->ant) 924 return 0; 925 926 rate->ant = new_ant_type; 927 928 return 1; 929 } 930 931 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta, 932 struct rs_rate *rate) 933 { 934 if (is_legacy(rate)) 935 return lq_sta->active_legacy_rate; 936 else if (is_siso(rate)) 937 return lq_sta->active_siso_rate; 938 else if (is_mimo2(rate)) 939 return lq_sta->active_mimo2_rate; 940 941 WARN_ON_ONCE(1); 942 return 0; 943 } 944 945 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask, 946 int rate_type) 947 { 948 u8 high = IWL_RATE_INVALID; 949 u8 low = IWL_RATE_INVALID; 950 951 /* 802.11A or ht walks to the next literal adjacent rate in 952 * the rate table */ 953 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) { 954 int i; 955 u32 mask; 956 957 /* Find the previous rate that is in the rate mask */ 958 i = index - 1; 959 for (mask = (1 << i); i >= 0; i--, mask >>= 1) { 960 if (rate_mask & mask) { 961 low = i; 962 break; 963 } 964 } 965 966 /* Find the next rate that is in the rate mask */ 967 i = index + 1; 968 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) { 969 if (rate_mask & mask) { 970 high = i; 971 break; 972 } 973 } 974 975 return (high << 8) | low; 976 } 977 978 low = index; 979 while (low != IWL_RATE_INVALID) { 980 low = iwl_rates[low].prev_rs; 981 if (low == IWL_RATE_INVALID) 982 break; 983 if (rate_mask & (1 << low)) 984 break; 985 } 986 987 high = index; 988 while (high != IWL_RATE_INVALID) { 989 high = iwl_rates[high].next_rs; 990 if (high == IWL_RATE_INVALID) 991 break; 992 if (rate_mask & (1 << high)) 993 break; 994 } 995 996 return (high << 8) | low; 997 } 998 999 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta, 1000 struct rs_rate *rate) 1001 { 1002 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate); 1003 } 1004 1005 /* Get the next supported lower rate in the current column. 1006 * Return true if bottom rate in the current column was reached 1007 */ 1008 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta, 1009 struct rs_rate *rate) 1010 { 1011 u8 low; 1012 u16 high_low; 1013 u16 rate_mask; 1014 struct iwl_mvm *mvm = lq_sta->pers.drv; 1015 1016 rate_mask = rs_get_supported_rates(lq_sta, rate); 1017 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask, 1018 rate->type); 1019 low = high_low & 0xff; 1020 1021 /* Bottom rate of column reached */ 1022 if (low == IWL_RATE_INVALID) 1023 return true; 1024 1025 rate->index = low; 1026 return false; 1027 } 1028 1029 /* Get the next rate to use following a column downgrade */ 1030 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta, 1031 struct rs_rate *rate) 1032 { 1033 struct iwl_mvm *mvm = lq_sta->pers.drv; 1034 1035 if (is_legacy(rate)) { 1036 /* No column to downgrade from Legacy */ 1037 return; 1038 } else if (is_siso(rate)) { 1039 /* Downgrade to Legacy if we were in SISO */ 1040 if (lq_sta->band == IEEE80211_BAND_5GHZ) 1041 rate->type = LQ_LEGACY_A; 1042 else 1043 rate->type = LQ_LEGACY_G; 1044 1045 rate->bw = RATE_MCS_CHAN_WIDTH_20; 1046 1047 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX || 1048 rate->index > IWL_RATE_MCS_9_INDEX); 1049 1050 rate->index = rs_ht_to_legacy[rate->index]; 1051 rate->ldpc = false; 1052 } else { 1053 /* Downgrade to SISO with same MCS if in MIMO */ 1054 rate->type = is_vht_mimo2(rate) ? 1055 LQ_VHT_SISO : LQ_HT_SISO; 1056 } 1057 1058 if (num_of_ant(rate->ant) > 1) 1059 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm)); 1060 1061 /* Relevant in both switching to SISO or Legacy */ 1062 rate->sgi = false; 1063 1064 if (!rs_rate_supported(lq_sta, rate)) 1065 rs_get_lower_rate_in_column(lq_sta, rate); 1066 } 1067 1068 /* Check if both rates are identical 1069 * allow_ant_mismatch enables matching a SISO rate on ANT_A or ANT_B 1070 * with a rate indicating STBC/BFER and ANT_AB. 1071 */ 1072 static inline bool rs_rate_equal(struct rs_rate *a, 1073 struct rs_rate *b, 1074 bool allow_ant_mismatch) 1075 1076 { 1077 bool ant_match = (a->ant == b->ant) && (a->stbc == b->stbc) && 1078 (a->bfer == b->bfer); 1079 1080 if (allow_ant_mismatch) { 1081 if (a->stbc || a->bfer) { 1082 WARN_ONCE(a->ant != ANT_AB, "stbc %d bfer %d ant %d", 1083 a->stbc, a->bfer, a->ant); 1084 ant_match |= (b->ant == ANT_A || b->ant == ANT_B); 1085 } else if (b->stbc || b->bfer) { 1086 WARN_ONCE(b->ant != ANT_AB, "stbc %d bfer %d ant %d", 1087 b->stbc, b->bfer, b->ant); 1088 ant_match |= (a->ant == ANT_A || a->ant == ANT_B); 1089 } 1090 } 1091 1092 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) && 1093 (a->ldpc == b->ldpc) && (a->index == b->index) && ant_match; 1094 } 1095 1096 /* Check if both rates share the same column */ 1097 static inline bool rs_rate_column_match(struct rs_rate *a, 1098 struct rs_rate *b) 1099 { 1100 bool ant_match; 1101 1102 if (a->stbc || a->bfer) 1103 ant_match = (b->ant == ANT_A || b->ant == ANT_B); 1104 else 1105 ant_match = (a->ant == b->ant); 1106 1107 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) 1108 && ant_match; 1109 } 1110 1111 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate) 1112 { 1113 if (is_legacy(rate)) { 1114 if (rate->ant == ANT_A) 1115 return RS_COLUMN_LEGACY_ANT_A; 1116 1117 if (rate->ant == ANT_B) 1118 return RS_COLUMN_LEGACY_ANT_B; 1119 1120 goto err; 1121 } 1122 1123 if (is_siso(rate)) { 1124 if (rate->ant == ANT_A || rate->stbc || rate->bfer) 1125 return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI : 1126 RS_COLUMN_SISO_ANT_A; 1127 1128 if (rate->ant == ANT_B) 1129 return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI : 1130 RS_COLUMN_SISO_ANT_B; 1131 1132 goto err; 1133 } 1134 1135 if (is_mimo(rate)) 1136 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2; 1137 1138 err: 1139 return RS_COLUMN_INVALID; 1140 } 1141 1142 static u8 rs_get_tid(struct ieee80211_hdr *hdr) 1143 { 1144 u8 tid = IWL_MAX_TID_COUNT; 1145 1146 if (ieee80211_is_data_qos(hdr->frame_control)) { 1147 u8 *qc = ieee80211_get_qos_ctl(hdr); 1148 tid = qc[0] & 0xf; 1149 } 1150 1151 if (unlikely(tid > IWL_MAX_TID_COUNT)) 1152 tid = IWL_MAX_TID_COUNT; 1153 1154 return tid; 1155 } 1156 1157 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1158 int tid, struct ieee80211_tx_info *info) 1159 { 1160 int legacy_success; 1161 int retries; 1162 int i; 1163 struct iwl_lq_cmd *table; 1164 u32 lq_hwrate; 1165 struct rs_rate lq_rate, tx_resp_rate; 1166 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl; 1167 u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0]; 1168 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1]; 1169 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 1170 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta; 1171 bool allow_ant_mismatch = fw_has_api(&mvm->fw->ucode_capa, 1172 IWL_UCODE_TLV_API_LQ_SS_PARAMS); 1173 1174 /* Treat uninitialized rate scaling data same as non-existing. */ 1175 if (!lq_sta) { 1176 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n"); 1177 return; 1178 } else if (!lq_sta->pers.drv) { 1179 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n"); 1180 return; 1181 } 1182 1183 /* This packet was aggregated but doesn't carry status info */ 1184 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 1185 !(info->flags & IEEE80211_TX_STAT_AMPDU)) 1186 return; 1187 1188 rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate); 1189 1190 #ifdef CONFIG_MAC80211_DEBUGFS 1191 /* Disable last tx check if we are debugging with fixed rate but 1192 * update tx stats */ 1193 if (lq_sta->pers.dbg_fixed_rate) { 1194 int index = tx_resp_rate.index; 1195 enum rs_column column; 1196 int attempts, success; 1197 1198 column = rs_get_column_from_rate(&tx_resp_rate); 1199 if (WARN_ONCE(column == RS_COLUMN_INVALID, 1200 "Can't map rate 0x%x to column", 1201 tx_resp_hwrate)) 1202 return; 1203 1204 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 1205 attempts = info->status.ampdu_len; 1206 success = info->status.ampdu_ack_len; 1207 } else { 1208 attempts = info->status.rates[0].count; 1209 success = !!(info->flags & IEEE80211_TX_STAT_ACK); 1210 } 1211 1212 lq_sta->pers.tx_stats[column][index].total += attempts; 1213 lq_sta->pers.tx_stats[column][index].success += success; 1214 1215 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n", 1216 tx_resp_hwrate, success, attempts); 1217 return; 1218 } 1219 #endif 1220 1221 if (time_after(jiffies, 1222 (unsigned long)(lq_sta->last_tx + 1223 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) { 1224 int t; 1225 1226 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n"); 1227 for (t = 0; t < IWL_MAX_TID_COUNT; t++) 1228 ieee80211_stop_tx_ba_session(sta, t); 1229 1230 iwl_mvm_rs_rate_init(mvm, sta, info->band, false); 1231 return; 1232 } 1233 lq_sta->last_tx = jiffies; 1234 1235 /* Ignore this Tx frame response if its initial rate doesn't match 1236 * that of latest Link Quality command. There may be stragglers 1237 * from a previous Link Quality command, but we're no longer interested 1238 * in those; they're either from the "active" mode while we're trying 1239 * to check "search" mode, or a prior "search" mode after we've moved 1240 * to a new "search" mode (which might become the new "active" mode). 1241 */ 1242 table = &lq_sta->lq; 1243 lq_hwrate = le32_to_cpu(table->rs_table[0]); 1244 rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate); 1245 1246 /* Here we actually compare this rate to the latest LQ command */ 1247 if (!rs_rate_equal(&tx_resp_rate, &lq_rate, allow_ant_mismatch)) { 1248 IWL_DEBUG_RATE(mvm, 1249 "initial tx resp rate 0x%x does not match 0x%x\n", 1250 tx_resp_hwrate, lq_hwrate); 1251 1252 /* 1253 * Since rates mis-match, the last LQ command may have failed. 1254 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with 1255 * ... driver. 1256 */ 1257 lq_sta->missed_rate_counter++; 1258 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) { 1259 lq_sta->missed_rate_counter = 0; 1260 IWL_DEBUG_RATE(mvm, 1261 "Too many rates mismatch. Send sync LQ. rs_state %d\n", 1262 lq_sta->rs_state); 1263 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false); 1264 } 1265 /* Regardless, ignore this status info for outdated rate */ 1266 return; 1267 } else 1268 /* Rate did match, so reset the missed_rate_counter */ 1269 lq_sta->missed_rate_counter = 0; 1270 1271 if (!lq_sta->search_better_tbl) { 1272 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1273 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1274 } else { 1275 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1276 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1277 } 1278 1279 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) { 1280 IWL_DEBUG_RATE(mvm, 1281 "Neither active nor search matches tx rate\n"); 1282 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1283 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE"); 1284 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1285 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH"); 1286 rs_dump_rate(mvm, &lq_rate, "ACTUAL"); 1287 1288 /* 1289 * no matching table found, let's by-pass the data collection 1290 * and continue to perform rate scale to find the rate table 1291 */ 1292 rs_stay_in_table(lq_sta, true); 1293 goto done; 1294 } 1295 1296 /* 1297 * Updating the frame history depends on whether packets were 1298 * aggregated. 1299 * 1300 * For aggregation, all packets were transmitted at the same rate, the 1301 * first index into rate scale table. 1302 */ 1303 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 1304 /* ampdu_ack_len = 0 marks no BA was received. In this case 1305 * treat it as a single frame loss as we don't want the success 1306 * ratio to dip too quickly because a BA wasn't received 1307 */ 1308 if (info->status.ampdu_ack_len == 0) 1309 info->status.ampdu_len = 1; 1310 1311 rs_collect_tx_data(mvm, lq_sta, curr_tbl, lq_rate.index, 1312 info->status.ampdu_len, 1313 info->status.ampdu_ack_len, 1314 reduced_txp); 1315 1316 /* Update success/fail counts if not searching for new mode */ 1317 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1318 lq_sta->total_success += info->status.ampdu_ack_len; 1319 lq_sta->total_failed += (info->status.ampdu_len - 1320 info->status.ampdu_ack_len); 1321 } 1322 } else { 1323 /* For legacy, update frame history with for each Tx retry. */ 1324 retries = info->status.rates[0].count - 1; 1325 /* HW doesn't send more than 15 retries */ 1326 retries = min(retries, 15); 1327 1328 /* The last transmission may have been successful */ 1329 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK); 1330 /* Collect data for each rate used during failed TX attempts */ 1331 for (i = 0; i <= retries; ++i) { 1332 lq_hwrate = le32_to_cpu(table->rs_table[i]); 1333 rs_rate_from_ucode_rate(lq_hwrate, info->band, 1334 &lq_rate); 1335 /* 1336 * Only collect stats if retried rate is in the same RS 1337 * table as active/search. 1338 */ 1339 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate)) 1340 tmp_tbl = curr_tbl; 1341 else if (rs_rate_column_match(&lq_rate, 1342 &other_tbl->rate)) 1343 tmp_tbl = other_tbl; 1344 else 1345 continue; 1346 1347 rs_collect_tx_data(mvm, lq_sta, tmp_tbl, lq_rate.index, 1348 1, i < retries ? 0 : legacy_success, 1349 reduced_txp); 1350 } 1351 1352 /* Update success/fail counts if not searching for new mode */ 1353 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1354 lq_sta->total_success += legacy_success; 1355 lq_sta->total_failed += retries + (1 - legacy_success); 1356 } 1357 } 1358 /* The last TX rate is cached in lq_sta; it's set in if/else above */ 1359 lq_sta->last_rate_n_flags = lq_hwrate; 1360 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp); 1361 done: 1362 /* See if there's a better rate or modulation mode to try. */ 1363 if (sta->supp_rates[info->band]) 1364 rs_rate_scale_perform(mvm, sta, lq_sta, tid); 1365 } 1366 1367 /* 1368 * mac80211 sends us Tx status 1369 */ 1370 static void rs_mac80211_tx_status(void *mvm_r, 1371 struct ieee80211_supported_band *sband, 1372 struct ieee80211_sta *sta, void *priv_sta, 1373 struct sk_buff *skb) 1374 { 1375 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1376 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r; 1377 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 1378 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1379 1380 if (!iwl_mvm_sta_from_mac80211(sta)->vif) 1381 return; 1382 1383 if (!ieee80211_is_data(hdr->frame_control) || 1384 info->flags & IEEE80211_TX_CTL_NO_ACK) 1385 return; 1386 1387 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info); 1388 } 1389 1390 /* 1391 * Begin a period of staying with a selected modulation mode. 1392 * Set "stay_in_tbl" flag to prevent any mode switches. 1393 * Set frame tx success limits according to legacy vs. high-throughput, 1394 * and reset overall (spanning all rates) tx success history statistics. 1395 * These control how long we stay using same modulation mode before 1396 * searching for a new mode. 1397 */ 1398 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy, 1399 struct iwl_lq_sta *lq_sta) 1400 { 1401 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n"); 1402 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN; 1403 if (is_legacy) { 1404 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT; 1405 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT; 1406 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT; 1407 } else { 1408 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT; 1409 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT; 1410 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT; 1411 } 1412 lq_sta->table_count = 0; 1413 lq_sta->total_failed = 0; 1414 lq_sta->total_success = 0; 1415 lq_sta->flush_timer = jiffies; 1416 lq_sta->visited_columns = 0; 1417 } 1418 1419 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask) 1420 { 1421 if (rate_mask) 1422 return find_last_bit(&rate_mask, BITS_PER_LONG); 1423 return IWL_RATE_INVALID; 1424 } 1425 1426 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta, 1427 const struct rs_tx_column *column) 1428 { 1429 switch (column->mode) { 1430 case RS_LEGACY: 1431 return lq_sta->max_legacy_rate_idx; 1432 case RS_SISO: 1433 return lq_sta->max_siso_rate_idx; 1434 case RS_MIMO2: 1435 return lq_sta->max_mimo2_rate_idx; 1436 default: 1437 WARN_ON_ONCE(1); 1438 } 1439 1440 return lq_sta->max_legacy_rate_idx; 1441 } 1442 1443 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1444 const struct rs_tx_column *column, 1445 u32 bw) 1446 { 1447 /* Used to choose among HT tables */ 1448 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT]; 1449 1450 if (WARN_ON_ONCE(column->mode != RS_LEGACY && 1451 column->mode != RS_SISO && 1452 column->mode != RS_MIMO2)) 1453 return expected_tpt_legacy; 1454 1455 /* Legacy rates have only one table */ 1456 if (column->mode == RS_LEGACY) 1457 return expected_tpt_legacy; 1458 1459 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1460 /* Choose among many HT tables depending on number of streams 1461 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation 1462 * status */ 1463 if (column->mode == RS_SISO) { 1464 switch (bw) { 1465 case RATE_MCS_CHAN_WIDTH_20: 1466 ht_tbl_pointer = expected_tpt_siso_20MHz; 1467 break; 1468 case RATE_MCS_CHAN_WIDTH_40: 1469 ht_tbl_pointer = expected_tpt_siso_40MHz; 1470 break; 1471 case RATE_MCS_CHAN_WIDTH_80: 1472 ht_tbl_pointer = expected_tpt_siso_80MHz; 1473 break; 1474 default: 1475 WARN_ON_ONCE(1); 1476 } 1477 } else if (column->mode == RS_MIMO2) { 1478 switch (bw) { 1479 case RATE_MCS_CHAN_WIDTH_20: 1480 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1481 break; 1482 case RATE_MCS_CHAN_WIDTH_40: 1483 ht_tbl_pointer = expected_tpt_mimo2_40MHz; 1484 break; 1485 case RATE_MCS_CHAN_WIDTH_80: 1486 ht_tbl_pointer = expected_tpt_mimo2_80MHz; 1487 break; 1488 default: 1489 WARN_ON_ONCE(1); 1490 } 1491 } else { 1492 WARN_ON_ONCE(1); 1493 } 1494 1495 if (!column->sgi && !lq_sta->is_agg) /* Normal */ 1496 return ht_tbl_pointer[0]; 1497 else if (column->sgi && !lq_sta->is_agg) /* SGI */ 1498 return ht_tbl_pointer[1]; 1499 else if (!column->sgi && lq_sta->is_agg) /* AGG */ 1500 return ht_tbl_pointer[2]; 1501 else /* AGG+SGI */ 1502 return ht_tbl_pointer[3]; 1503 } 1504 1505 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1506 struct iwl_scale_tbl_info *tbl) 1507 { 1508 struct rs_rate *rate = &tbl->rate; 1509 const struct rs_tx_column *column = &rs_tx_columns[tbl->column]; 1510 1511 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw); 1512 } 1513 1514 static s32 rs_get_best_rate(struct iwl_mvm *mvm, 1515 struct iwl_lq_sta *lq_sta, 1516 struct iwl_scale_tbl_info *tbl, /* "search" */ 1517 unsigned long rate_mask, s8 index) 1518 { 1519 struct iwl_scale_tbl_info *active_tbl = 1520 &(lq_sta->lq_info[lq_sta->active_tbl]); 1521 s32 success_ratio = active_tbl->win[index].success_ratio; 1522 u16 expected_current_tpt = active_tbl->expected_tpt[index]; 1523 const u16 *tpt_tbl = tbl->expected_tpt; 1524 u16 high_low; 1525 u32 target_tpt; 1526 int rate_idx; 1527 1528 if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { 1529 target_tpt = 100 * expected_current_tpt; 1530 IWL_DEBUG_RATE(mvm, 1531 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n", 1532 success_ratio, target_tpt); 1533 } else { 1534 target_tpt = lq_sta->last_tpt; 1535 IWL_DEBUG_RATE(mvm, 1536 "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n", 1537 success_ratio, target_tpt); 1538 } 1539 1540 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG); 1541 1542 while (rate_idx != IWL_RATE_INVALID) { 1543 if (target_tpt < (100 * tpt_tbl[rate_idx])) 1544 break; 1545 1546 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask, 1547 tbl->rate.type); 1548 1549 rate_idx = (high_low >> 8) & 0xff; 1550 } 1551 1552 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n", 1553 rate_idx, target_tpt, 1554 rate_idx != IWL_RATE_INVALID ? 1555 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE); 1556 1557 return rate_idx; 1558 } 1559 1560 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta) 1561 { 1562 if (sta->bandwidth >= IEEE80211_STA_RX_BW_80) 1563 return RATE_MCS_CHAN_WIDTH_80; 1564 else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40) 1565 return RATE_MCS_CHAN_WIDTH_40; 1566 1567 return RATE_MCS_CHAN_WIDTH_20; 1568 } 1569 1570 /* 1571 * Check whether we should continue using same modulation mode, or 1572 * begin search for a new mode, based on: 1573 * 1) # tx successes or failures while using this mode 1574 * 2) # times calling this function 1575 * 3) elapsed time in this mode (not used, for now) 1576 */ 1577 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search) 1578 { 1579 struct iwl_scale_tbl_info *tbl; 1580 int active_tbl; 1581 int flush_interval_passed = 0; 1582 struct iwl_mvm *mvm; 1583 1584 mvm = lq_sta->pers.drv; 1585 active_tbl = lq_sta->active_tbl; 1586 1587 tbl = &(lq_sta->lq_info[active_tbl]); 1588 1589 /* If we've been disallowing search, see if we should now allow it */ 1590 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1591 /* Elapsed time using current modulation mode */ 1592 if (lq_sta->flush_timer) 1593 flush_interval_passed = 1594 time_after(jiffies, 1595 (unsigned long)(lq_sta->flush_timer + 1596 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ))); 1597 1598 /* 1599 * Check if we should allow search for new modulation mode. 1600 * If many frames have failed or succeeded, or we've used 1601 * this same modulation for a long time, allow search, and 1602 * reset history stats that keep track of whether we should 1603 * allow a new search. Also (below) reset all bitmaps and 1604 * stats in active history. 1605 */ 1606 if (force_search || 1607 (lq_sta->total_failed > lq_sta->max_failure_limit) || 1608 (lq_sta->total_success > lq_sta->max_success_limit) || 1609 ((!lq_sta->search_better_tbl) && 1610 (lq_sta->flush_timer) && (flush_interval_passed))) { 1611 IWL_DEBUG_RATE(mvm, 1612 "LQ: stay is expired %d %d %d\n", 1613 lq_sta->total_failed, 1614 lq_sta->total_success, 1615 flush_interval_passed); 1616 1617 /* Allow search for new mode */ 1618 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED; 1619 IWL_DEBUG_RATE(mvm, 1620 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n"); 1621 lq_sta->total_failed = 0; 1622 lq_sta->total_success = 0; 1623 lq_sta->flush_timer = 0; 1624 /* mark the current column as visited */ 1625 lq_sta->visited_columns = BIT(tbl->column); 1626 /* 1627 * Else if we've used this modulation mode enough repetitions 1628 * (regardless of elapsed time or success/failure), reset 1629 * history bitmaps and rate-specific stats for all rates in 1630 * active table. 1631 */ 1632 } else { 1633 lq_sta->table_count++; 1634 if (lq_sta->table_count >= 1635 lq_sta->table_count_limit) { 1636 lq_sta->table_count = 0; 1637 1638 IWL_DEBUG_RATE(mvm, 1639 "LQ: stay in table clear win\n"); 1640 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1641 } 1642 } 1643 1644 /* If transitioning to allow "search", reset all history 1645 * bitmaps and stats in active table (this will become the new 1646 * "search" table). */ 1647 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) { 1648 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1649 } 1650 } 1651 } 1652 1653 /* 1654 * setup rate table in uCode 1655 */ 1656 static void rs_update_rate_tbl(struct iwl_mvm *mvm, 1657 struct ieee80211_sta *sta, 1658 struct iwl_lq_sta *lq_sta, 1659 struct iwl_scale_tbl_info *tbl) 1660 { 1661 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate); 1662 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false); 1663 } 1664 1665 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm, 1666 struct ieee80211_sta *sta, 1667 struct iwl_lq_sta *lq_sta, 1668 struct iwl_scale_tbl_info *tbl, 1669 enum rs_action scale_action) 1670 { 1671 if (sta->bandwidth != IEEE80211_STA_RX_BW_80) 1672 return false; 1673 1674 if (!is_vht_siso(&tbl->rate)) 1675 return false; 1676 1677 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) && 1678 (tbl->rate.index == IWL_RATE_MCS_0_INDEX) && 1679 (scale_action == RS_ACTION_DOWNSCALE)) { 1680 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20; 1681 tbl->rate.index = IWL_RATE_MCS_4_INDEX; 1682 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n"); 1683 goto tweaked; 1684 } 1685 1686 /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is 1687 * sustainable, i.e. we're past the test window. We can't go back 1688 * if MCS5 is just tested as this will happen always after switching 1689 * to 20Mhz MCS4 because the rate stats are cleared. 1690 */ 1691 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) && 1692 (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) && 1693 (scale_action == RS_ACTION_STAY)) || 1694 ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) && 1695 (scale_action == RS_ACTION_UPSCALE)))) { 1696 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80; 1697 tbl->rate.index = IWL_RATE_MCS_1_INDEX; 1698 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n"); 1699 goto tweaked; 1700 } 1701 1702 return false; 1703 1704 tweaked: 1705 rs_set_expected_tpt_table(lq_sta, tbl); 1706 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1707 return true; 1708 } 1709 1710 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm, 1711 struct iwl_lq_sta *lq_sta, 1712 struct ieee80211_sta *sta, 1713 struct iwl_scale_tbl_info *tbl) 1714 { 1715 int i, j, max_rate; 1716 enum rs_column next_col_id; 1717 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column]; 1718 const struct rs_tx_column *next_col; 1719 allow_column_func_t allow_func; 1720 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm); 1721 const u16 *expected_tpt_tbl; 1722 u16 tpt, max_expected_tpt; 1723 1724 for (i = 0; i < MAX_NEXT_COLUMNS; i++) { 1725 next_col_id = curr_col->next_columns[i]; 1726 1727 if (next_col_id == RS_COLUMN_INVALID) 1728 continue; 1729 1730 if (lq_sta->visited_columns & BIT(next_col_id)) { 1731 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n", 1732 next_col_id); 1733 continue; 1734 } 1735 1736 next_col = &rs_tx_columns[next_col_id]; 1737 1738 if (!rs_is_valid_ant(valid_ants, next_col->ant)) { 1739 IWL_DEBUG_RATE(mvm, 1740 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n", 1741 next_col_id, valid_ants, next_col->ant); 1742 continue; 1743 } 1744 1745 for (j = 0; j < MAX_COLUMN_CHECKS; j++) { 1746 allow_func = next_col->checks[j]; 1747 if (allow_func && !allow_func(mvm, sta, &tbl->rate, 1748 next_col)) 1749 break; 1750 } 1751 1752 if (j != MAX_COLUMN_CHECKS) { 1753 IWL_DEBUG_RATE(mvm, 1754 "Skip column %d: not allowed (check %d failed)\n", 1755 next_col_id, j); 1756 1757 continue; 1758 } 1759 1760 tpt = lq_sta->last_tpt / 100; 1761 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col, 1762 rs_bw_from_sta_bw(sta)); 1763 if (WARN_ON_ONCE(!expected_tpt_tbl)) 1764 continue; 1765 1766 max_rate = rs_get_max_allowed_rate(lq_sta, next_col); 1767 if (max_rate == IWL_RATE_INVALID) { 1768 IWL_DEBUG_RATE(mvm, 1769 "Skip column %d: no rate is allowed in this column\n", 1770 next_col_id); 1771 continue; 1772 } 1773 1774 max_expected_tpt = expected_tpt_tbl[max_rate]; 1775 if (tpt >= max_expected_tpt) { 1776 IWL_DEBUG_RATE(mvm, 1777 "Skip column %d: can't beat current TPT. Max expected %d current %d\n", 1778 next_col_id, max_expected_tpt, tpt); 1779 continue; 1780 } 1781 1782 IWL_DEBUG_RATE(mvm, 1783 "Found potential column %d. Max expected %d current %d\n", 1784 next_col_id, max_expected_tpt, tpt); 1785 break; 1786 } 1787 1788 if (i == MAX_NEXT_COLUMNS) 1789 return RS_COLUMN_INVALID; 1790 1791 return next_col_id; 1792 } 1793 1794 static int rs_switch_to_column(struct iwl_mvm *mvm, 1795 struct iwl_lq_sta *lq_sta, 1796 struct ieee80211_sta *sta, 1797 enum rs_column col_id) 1798 { 1799 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1800 struct iwl_scale_tbl_info *search_tbl = 1801 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 1802 struct rs_rate *rate = &search_tbl->rate; 1803 const struct rs_tx_column *column = &rs_tx_columns[col_id]; 1804 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column]; 1805 u32 sz = (sizeof(struct iwl_scale_tbl_info) - 1806 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); 1807 unsigned long rate_mask = 0; 1808 u32 rate_idx = 0; 1809 1810 memcpy(search_tbl, tbl, sz); 1811 1812 rate->sgi = column->sgi; 1813 rate->ant = column->ant; 1814 1815 if (column->mode == RS_LEGACY) { 1816 if (lq_sta->band == IEEE80211_BAND_5GHZ) 1817 rate->type = LQ_LEGACY_A; 1818 else 1819 rate->type = LQ_LEGACY_G; 1820 1821 rate->bw = RATE_MCS_CHAN_WIDTH_20; 1822 rate->ldpc = false; 1823 rate_mask = lq_sta->active_legacy_rate; 1824 } else if (column->mode == RS_SISO) { 1825 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; 1826 rate_mask = lq_sta->active_siso_rate; 1827 } else if (column->mode == RS_MIMO2) { 1828 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; 1829 rate_mask = lq_sta->active_mimo2_rate; 1830 } else { 1831 WARN_ONCE(1, "Bad column mode"); 1832 } 1833 1834 if (column->mode != RS_LEGACY) { 1835 rate->bw = rs_bw_from_sta_bw(sta); 1836 rate->ldpc = lq_sta->ldpc; 1837 } 1838 1839 search_tbl->column = col_id; 1840 rs_set_expected_tpt_table(lq_sta, search_tbl); 1841 1842 lq_sta->visited_columns |= BIT(col_id); 1843 1844 /* Get the best matching rate if we're changing modes. e.g. 1845 * SISO->MIMO, LEGACY->SISO, MIMO->SISO 1846 */ 1847 if (curr_column->mode != column->mode) { 1848 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl, 1849 rate_mask, rate->index); 1850 1851 if ((rate_idx == IWL_RATE_INVALID) || 1852 !(BIT(rate_idx) & rate_mask)) { 1853 IWL_DEBUG_RATE(mvm, 1854 "can not switch with index %d" 1855 " rate mask %lx\n", 1856 rate_idx, rate_mask); 1857 1858 goto err; 1859 } 1860 1861 rate->index = rate_idx; 1862 } 1863 1864 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n", 1865 col_id, rate->index); 1866 1867 return 0; 1868 1869 err: 1870 rate->type = LQ_NONE; 1871 return -1; 1872 } 1873 1874 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm, 1875 struct iwl_scale_tbl_info *tbl, 1876 s32 sr, int low, int high, 1877 int current_tpt, 1878 int low_tpt, int high_tpt) 1879 { 1880 enum rs_action action = RS_ACTION_STAY; 1881 1882 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) || 1883 (current_tpt == 0)) { 1884 IWL_DEBUG_RATE(mvm, 1885 "Decrease rate because of low SR\n"); 1886 return RS_ACTION_DOWNSCALE; 1887 } 1888 1889 if ((low_tpt == IWL_INVALID_VALUE) && 1890 (high_tpt == IWL_INVALID_VALUE) && 1891 (high != IWL_RATE_INVALID)) { 1892 IWL_DEBUG_RATE(mvm, 1893 "No data about high/low rates. Increase rate\n"); 1894 return RS_ACTION_UPSCALE; 1895 } 1896 1897 if ((high_tpt == IWL_INVALID_VALUE) && 1898 (high != IWL_RATE_INVALID) && 1899 (low_tpt != IWL_INVALID_VALUE) && 1900 (low_tpt < current_tpt)) { 1901 IWL_DEBUG_RATE(mvm, 1902 "No data about high rate and low rate is worse. Increase rate\n"); 1903 return RS_ACTION_UPSCALE; 1904 } 1905 1906 if ((high_tpt != IWL_INVALID_VALUE) && 1907 (high_tpt > current_tpt)) { 1908 IWL_DEBUG_RATE(mvm, 1909 "Higher rate is better. Increate rate\n"); 1910 return RS_ACTION_UPSCALE; 1911 } 1912 1913 if ((low_tpt != IWL_INVALID_VALUE) && 1914 (high_tpt != IWL_INVALID_VALUE) && 1915 (low_tpt < current_tpt) && 1916 (high_tpt < current_tpt)) { 1917 IWL_DEBUG_RATE(mvm, 1918 "Both high and low are worse. Maintain rate\n"); 1919 return RS_ACTION_STAY; 1920 } 1921 1922 if ((low_tpt != IWL_INVALID_VALUE) && 1923 (low_tpt > current_tpt)) { 1924 IWL_DEBUG_RATE(mvm, 1925 "Lower rate is better\n"); 1926 action = RS_ACTION_DOWNSCALE; 1927 goto out; 1928 } 1929 1930 if ((low_tpt == IWL_INVALID_VALUE) && 1931 (low != IWL_RATE_INVALID)) { 1932 IWL_DEBUG_RATE(mvm, 1933 "No data about lower rate\n"); 1934 action = RS_ACTION_DOWNSCALE; 1935 goto out; 1936 } 1937 1938 IWL_DEBUG_RATE(mvm, "Maintain rate\n"); 1939 1940 out: 1941 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) { 1942 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { 1943 IWL_DEBUG_RATE(mvm, 1944 "SR is above NO DECREASE. Avoid downscale\n"); 1945 action = RS_ACTION_STAY; 1946 } else if (current_tpt > (100 * tbl->expected_tpt[low])) { 1947 IWL_DEBUG_RATE(mvm, 1948 "Current TPT is higher than max expected in low rate. Avoid downscale\n"); 1949 action = RS_ACTION_STAY; 1950 } else { 1951 IWL_DEBUG_RATE(mvm, "Decrease rate\n"); 1952 } 1953 } 1954 1955 return action; 1956 } 1957 1958 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1959 struct iwl_lq_sta *lq_sta) 1960 { 1961 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which 1962 * supports STBC of at least 1*SS 1963 */ 1964 if (!lq_sta->stbc_capable) 1965 return false; 1966 1967 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 1968 return false; 1969 1970 return true; 1971 } 1972 1973 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index, 1974 int *weaker, int *stronger) 1975 { 1976 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP; 1977 if (*weaker > TPC_MAX_REDUCTION) 1978 *weaker = TPC_INVALID; 1979 1980 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP; 1981 if (*stronger < 0) 1982 *stronger = TPC_INVALID; 1983 } 1984 1985 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif, 1986 struct rs_rate *rate, enum ieee80211_band band) 1987 { 1988 int index = rate->index; 1989 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM); 1990 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION && 1991 !vif->bss_conf.ps); 1992 1993 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n", 1994 cam, sta_ps_disabled); 1995 /* 1996 * allow tpc only if power management is enabled, or bt coex 1997 * activity grade allows it and we are on 2.4Ghz. 1998 */ 1999 if ((cam || sta_ps_disabled) && 2000 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band)) 2001 return false; 2002 2003 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type); 2004 if (is_legacy(rate)) 2005 return index == IWL_RATE_54M_INDEX; 2006 if (is_ht(rate)) 2007 return index == IWL_RATE_MCS_7_INDEX; 2008 if (is_vht(rate)) 2009 return index == IWL_RATE_MCS_7_INDEX || 2010 index == IWL_RATE_MCS_8_INDEX || 2011 index == IWL_RATE_MCS_9_INDEX; 2012 2013 WARN_ON_ONCE(1); 2014 return false; 2015 } 2016 2017 enum tpc_action { 2018 TPC_ACTION_STAY, 2019 TPC_ACTION_DECREASE, 2020 TPC_ACTION_INCREASE, 2021 TPC_ACTION_NO_RESTIRCTION, 2022 }; 2023 2024 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm, 2025 s32 sr, int weak, int strong, 2026 int current_tpt, 2027 int weak_tpt, int strong_tpt) 2028 { 2029 /* stay until we have valid tpt */ 2030 if (current_tpt == IWL_INVALID_VALUE) { 2031 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n"); 2032 return TPC_ACTION_STAY; 2033 } 2034 2035 /* Too many failures, increase txp */ 2036 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) || 2037 current_tpt == 0) { 2038 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n"); 2039 return TPC_ACTION_NO_RESTIRCTION; 2040 } 2041 2042 /* try decreasing first if applicable */ 2043 if (weak != TPC_INVALID) { 2044 if (weak_tpt == IWL_INVALID_VALUE && 2045 (strong_tpt == IWL_INVALID_VALUE || 2046 current_tpt >= strong_tpt)) { 2047 IWL_DEBUG_RATE(mvm, 2048 "no weak txp measurement. decrease txp\n"); 2049 return TPC_ACTION_DECREASE; 2050 } 2051 2052 if (weak_tpt > current_tpt) { 2053 IWL_DEBUG_RATE(mvm, 2054 "lower txp has better tpt. decrease txp\n"); 2055 return TPC_ACTION_DECREASE; 2056 } 2057 } 2058 2059 /* next, increase if needed */ 2060 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) && 2061 strong != TPC_INVALID) { 2062 if (weak_tpt == IWL_INVALID_VALUE && 2063 strong_tpt != IWL_INVALID_VALUE && 2064 current_tpt < strong_tpt) { 2065 IWL_DEBUG_RATE(mvm, 2066 "higher txp has better tpt. increase txp\n"); 2067 return TPC_ACTION_INCREASE; 2068 } 2069 2070 if (weak_tpt < current_tpt && 2071 (strong_tpt == IWL_INVALID_VALUE || 2072 strong_tpt > current_tpt)) { 2073 IWL_DEBUG_RATE(mvm, 2074 "lower txp has worse tpt. increase txp\n"); 2075 return TPC_ACTION_INCREASE; 2076 } 2077 } 2078 2079 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n"); 2080 return TPC_ACTION_STAY; 2081 } 2082 2083 static bool rs_tpc_perform(struct iwl_mvm *mvm, 2084 struct ieee80211_sta *sta, 2085 struct iwl_lq_sta *lq_sta, 2086 struct iwl_scale_tbl_info *tbl) 2087 { 2088 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta); 2089 struct ieee80211_vif *vif = mvm_sta->vif; 2090 struct ieee80211_chanctx_conf *chanctx_conf; 2091 enum ieee80211_band band; 2092 struct iwl_rate_scale_data *window; 2093 struct rs_rate *rate = &tbl->rate; 2094 enum tpc_action action; 2095 s32 sr; 2096 u8 cur = lq_sta->lq.reduced_tpc; 2097 int current_tpt; 2098 int weak, strong; 2099 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE; 2100 2101 #ifdef CONFIG_MAC80211_DEBUGFS 2102 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) { 2103 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n", 2104 lq_sta->pers.dbg_fixed_txp_reduction); 2105 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction; 2106 return cur != lq_sta->pers.dbg_fixed_txp_reduction; 2107 } 2108 #endif 2109 2110 rcu_read_lock(); 2111 chanctx_conf = rcu_dereference(vif->chanctx_conf); 2112 if (WARN_ON(!chanctx_conf)) 2113 band = IEEE80211_NUM_BANDS; 2114 else 2115 band = chanctx_conf->def.chan->band; 2116 rcu_read_unlock(); 2117 2118 if (!rs_tpc_allowed(mvm, vif, rate, band)) { 2119 IWL_DEBUG_RATE(mvm, 2120 "tpc is not allowed. remove txp restrictions\n"); 2121 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 2122 return cur != TPC_NO_REDUCTION; 2123 } 2124 2125 rs_get_adjacent_txp(mvm, cur, &weak, &strong); 2126 2127 /* Collect measured throughputs for current and adjacent rates */ 2128 window = tbl->tpc_win; 2129 sr = window[cur].success_ratio; 2130 current_tpt = window[cur].average_tpt; 2131 if (weak != TPC_INVALID) 2132 weak_tpt = window[weak].average_tpt; 2133 if (strong != TPC_INVALID) 2134 strong_tpt = window[strong].average_tpt; 2135 2136 IWL_DEBUG_RATE(mvm, 2137 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n", 2138 cur, current_tpt, sr, weak, strong, 2139 weak_tpt, strong_tpt); 2140 2141 action = rs_get_tpc_action(mvm, sr, weak, strong, 2142 current_tpt, weak_tpt, strong_tpt); 2143 2144 /* override actions if we are on the edge */ 2145 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) { 2146 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n"); 2147 action = TPC_ACTION_STAY; 2148 } else if (strong == TPC_INVALID && 2149 (action == TPC_ACTION_INCREASE || 2150 action == TPC_ACTION_NO_RESTIRCTION)) { 2151 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n"); 2152 action = TPC_ACTION_STAY; 2153 } 2154 2155 switch (action) { 2156 case TPC_ACTION_DECREASE: 2157 lq_sta->lq.reduced_tpc = weak; 2158 return true; 2159 case TPC_ACTION_INCREASE: 2160 lq_sta->lq.reduced_tpc = strong; 2161 return true; 2162 case TPC_ACTION_NO_RESTIRCTION: 2163 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 2164 return true; 2165 case TPC_ACTION_STAY: 2166 /* do nothing */ 2167 break; 2168 } 2169 return false; 2170 } 2171 2172 /* 2173 * Do rate scaling and search for new modulation mode. 2174 */ 2175 static void rs_rate_scale_perform(struct iwl_mvm *mvm, 2176 struct ieee80211_sta *sta, 2177 struct iwl_lq_sta *lq_sta, 2178 int tid) 2179 { 2180 int low = IWL_RATE_INVALID; 2181 int high = IWL_RATE_INVALID; 2182 int index; 2183 struct iwl_rate_scale_data *window = NULL; 2184 int current_tpt = IWL_INVALID_VALUE; 2185 int low_tpt = IWL_INVALID_VALUE; 2186 int high_tpt = IWL_INVALID_VALUE; 2187 u32 fail_count; 2188 enum rs_action scale_action = RS_ACTION_STAY; 2189 u16 rate_mask; 2190 u8 update_lq = 0; 2191 struct iwl_scale_tbl_info *tbl, *tbl1; 2192 u8 active_tbl = 0; 2193 u8 done_search = 0; 2194 u16 high_low; 2195 s32 sr; 2196 u8 prev_agg = lq_sta->is_agg; 2197 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta); 2198 struct iwl_mvm_tid_data *tid_data; 2199 struct rs_rate *rate; 2200 2201 lq_sta->is_agg = !!sta_priv->agg_tids; 2202 2203 /* 2204 * Select rate-scale / modulation-mode table to work with in 2205 * the rest of this function: "search" if searching for better 2206 * modulation mode, or "active" if doing rate scaling within a mode. 2207 */ 2208 if (!lq_sta->search_better_tbl) 2209 active_tbl = lq_sta->active_tbl; 2210 else 2211 active_tbl = 1 - lq_sta->active_tbl; 2212 2213 tbl = &(lq_sta->lq_info[active_tbl]); 2214 rate = &tbl->rate; 2215 2216 if (prev_agg != lq_sta->is_agg) { 2217 IWL_DEBUG_RATE(mvm, 2218 "Aggregation changed: prev %d current %d. Update expected TPT table\n", 2219 prev_agg, lq_sta->is_agg); 2220 rs_set_expected_tpt_table(lq_sta, tbl); 2221 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2222 } 2223 2224 /* current tx rate */ 2225 index = rate->index; 2226 2227 /* rates available for this association, and for modulation mode */ 2228 rate_mask = rs_get_supported_rates(lq_sta, rate); 2229 2230 if (!(BIT(index) & rate_mask)) { 2231 IWL_ERR(mvm, "Current Rate is not valid\n"); 2232 if (lq_sta->search_better_tbl) { 2233 /* revert to active table if search table is not valid*/ 2234 rate->type = LQ_NONE; 2235 lq_sta->search_better_tbl = 0; 2236 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 2237 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2238 } 2239 return; 2240 } 2241 2242 /* Get expected throughput table and history window for current rate */ 2243 if (!tbl->expected_tpt) { 2244 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n"); 2245 return; 2246 } 2247 2248 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2249 window = &(tbl->win[index]); 2250 2251 /* 2252 * If there is not enough history to calculate actual average 2253 * throughput, keep analyzing results of more tx frames, without 2254 * changing rate or mode (bypass most of the rest of this function). 2255 * Set up new rate table in uCode only if old rate is not supported 2256 * in current association (use new rate found above). 2257 */ 2258 fail_count = window->counter - window->success_counter; 2259 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) && 2260 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) { 2261 IWL_DEBUG_RATE(mvm, 2262 "%s: Test Window: succ %d total %d\n", 2263 rs_pretty_rate(rate), 2264 window->success_counter, window->counter); 2265 2266 /* Can't calculate this yet; not enough history */ 2267 window->average_tpt = IWL_INVALID_VALUE; 2268 2269 /* Should we stay with this modulation mode, 2270 * or search for a new one? */ 2271 rs_stay_in_table(lq_sta, false); 2272 2273 return; 2274 } 2275 2276 /* If we are searching for better modulation mode, check success. */ 2277 if (lq_sta->search_better_tbl) { 2278 /* If good success, continue using the "search" mode; 2279 * no need to send new link quality command, since we're 2280 * continuing to use the setup that we've been trying. */ 2281 if (window->average_tpt > lq_sta->last_tpt) { 2282 IWL_DEBUG_RATE(mvm, 2283 "SWITCHING TO NEW TABLE SR: %d " 2284 "cur-tpt %d old-tpt %d\n", 2285 window->success_ratio, 2286 window->average_tpt, 2287 lq_sta->last_tpt); 2288 2289 /* Swap tables; "search" becomes "active" */ 2290 lq_sta->active_tbl = active_tbl; 2291 current_tpt = window->average_tpt; 2292 /* Else poor success; go back to mode in "active" table */ 2293 } else { 2294 IWL_DEBUG_RATE(mvm, 2295 "GOING BACK TO THE OLD TABLE: SR %d " 2296 "cur-tpt %d old-tpt %d\n", 2297 window->success_ratio, 2298 window->average_tpt, 2299 lq_sta->last_tpt); 2300 2301 /* Nullify "search" table */ 2302 rate->type = LQ_NONE; 2303 2304 /* Revert to "active" table */ 2305 active_tbl = lq_sta->active_tbl; 2306 tbl = &(lq_sta->lq_info[active_tbl]); 2307 2308 /* Revert to "active" rate and throughput info */ 2309 index = tbl->rate.index; 2310 current_tpt = lq_sta->last_tpt; 2311 2312 /* Need to set up a new rate table in uCode */ 2313 update_lq = 1; 2314 } 2315 2316 /* Either way, we've made a decision; modulation mode 2317 * search is done, allow rate adjustment next time. */ 2318 lq_sta->search_better_tbl = 0; 2319 done_search = 1; /* Don't switch modes below! */ 2320 goto lq_update; 2321 } 2322 2323 /* (Else) not in search of better modulation mode, try for better 2324 * starting rate, while staying in this mode. */ 2325 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type); 2326 low = high_low & 0xff; 2327 high = (high_low >> 8) & 0xff; 2328 2329 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2330 2331 sr = window->success_ratio; 2332 2333 /* Collect measured throughputs for current and adjacent rates */ 2334 current_tpt = window->average_tpt; 2335 if (low != IWL_RATE_INVALID) 2336 low_tpt = tbl->win[low].average_tpt; 2337 if (high != IWL_RATE_INVALID) 2338 high_tpt = tbl->win[high].average_tpt; 2339 2340 IWL_DEBUG_RATE(mvm, 2341 "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n", 2342 rs_pretty_rate(rate), current_tpt, sr, 2343 low, high, low_tpt, high_tpt); 2344 2345 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high, 2346 current_tpt, low_tpt, high_tpt); 2347 2348 /* Force a search in case BT doesn't like us being in MIMO */ 2349 if (is_mimo(rate) && 2350 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) { 2351 IWL_DEBUG_RATE(mvm, 2352 "BT Coex forbids MIMO. Search for new config\n"); 2353 rs_stay_in_table(lq_sta, true); 2354 goto lq_update; 2355 } 2356 2357 switch (scale_action) { 2358 case RS_ACTION_DOWNSCALE: 2359 /* Decrease starting rate, update uCode's rate table */ 2360 if (low != IWL_RATE_INVALID) { 2361 update_lq = 1; 2362 index = low; 2363 } else { 2364 IWL_DEBUG_RATE(mvm, 2365 "At the bottom rate. Can't decrease\n"); 2366 } 2367 2368 break; 2369 case RS_ACTION_UPSCALE: 2370 /* Increase starting rate, update uCode's rate table */ 2371 if (high != IWL_RATE_INVALID) { 2372 update_lq = 1; 2373 index = high; 2374 } else { 2375 IWL_DEBUG_RATE(mvm, 2376 "At the top rate. Can't increase\n"); 2377 } 2378 2379 break; 2380 case RS_ACTION_STAY: 2381 /* No change */ 2382 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) 2383 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl); 2384 break; 2385 default: 2386 break; 2387 } 2388 2389 lq_update: 2390 /* Replace uCode's rate table for the destination station. */ 2391 if (update_lq) { 2392 tbl->rate.index = index; 2393 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK) 2394 rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action); 2395 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2396 } 2397 2398 rs_stay_in_table(lq_sta, false); 2399 2400 /* 2401 * Search for new modulation mode if we're: 2402 * 1) Not changing rates right now 2403 * 2) Not just finishing up a search 2404 * 3) Allowing a new search 2405 */ 2406 if (!update_lq && !done_search && 2407 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED 2408 && window->counter) { 2409 enum rs_column next_column; 2410 2411 /* Save current throughput to compare with "search" throughput*/ 2412 lq_sta->last_tpt = current_tpt; 2413 2414 IWL_DEBUG_RATE(mvm, 2415 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n", 2416 update_lq, done_search, lq_sta->rs_state, 2417 window->counter); 2418 2419 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl); 2420 if (next_column != RS_COLUMN_INVALID) { 2421 int ret = rs_switch_to_column(mvm, lq_sta, sta, 2422 next_column); 2423 if (!ret) 2424 lq_sta->search_better_tbl = 1; 2425 } else { 2426 IWL_DEBUG_RATE(mvm, 2427 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n"); 2428 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED; 2429 } 2430 2431 /* If new "search" mode was selected, set up in uCode table */ 2432 if (lq_sta->search_better_tbl) { 2433 /* Access the "search" table, clear its history. */ 2434 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 2435 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2436 2437 /* Use new "search" start rate */ 2438 index = tbl->rate.index; 2439 2440 rs_dump_rate(mvm, &tbl->rate, 2441 "Switch to SEARCH TABLE:"); 2442 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2443 } else { 2444 done_search = 1; 2445 } 2446 } 2447 2448 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) { 2449 /* If the "active" (non-search) mode was legacy, 2450 * and we've tried switching antennas, 2451 * but we haven't been able to try HT modes (not available), 2452 * stay with best antenna legacy modulation for a while 2453 * before next round of mode comparisons. */ 2454 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]); 2455 if (is_legacy(&tbl1->rate)) { 2456 IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n"); 2457 2458 if (tid != IWL_MAX_TID_COUNT) { 2459 tid_data = &sta_priv->tid_data[tid]; 2460 if (tid_data->state != IWL_AGG_OFF) { 2461 IWL_DEBUG_RATE(mvm, 2462 "Stop aggregation on tid %d\n", 2463 tid); 2464 ieee80211_stop_tx_ba_session(sta, tid); 2465 } 2466 } 2467 rs_set_stay_in_table(mvm, 1, lq_sta); 2468 } else { 2469 /* If we're in an HT mode, and all 3 mode switch actions 2470 * have been tried and compared, stay in this best modulation 2471 * mode for a while before next round of mode comparisons. */ 2472 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) && 2473 (lq_sta->tx_agg_tid_en & (1 << tid)) && 2474 (tid != IWL_MAX_TID_COUNT)) { 2475 tid_data = &sta_priv->tid_data[tid]; 2476 if (tid_data->state == IWL_AGG_OFF) { 2477 IWL_DEBUG_RATE(mvm, 2478 "try to aggregate tid %d\n", 2479 tid); 2480 rs_tl_turn_on_agg(mvm, tid, 2481 lq_sta, sta); 2482 } 2483 } 2484 rs_set_stay_in_table(mvm, 0, lq_sta); 2485 } 2486 } 2487 } 2488 2489 struct rs_init_rate_info { 2490 s8 rssi; 2491 u8 rate_idx; 2492 }; 2493 2494 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = { 2495 { -60, IWL_RATE_54M_INDEX }, 2496 { -64, IWL_RATE_48M_INDEX }, 2497 { -68, IWL_RATE_36M_INDEX }, 2498 { -80, IWL_RATE_24M_INDEX }, 2499 { -84, IWL_RATE_18M_INDEX }, 2500 { -85, IWL_RATE_12M_INDEX }, 2501 { -86, IWL_RATE_11M_INDEX }, 2502 { -88, IWL_RATE_5M_INDEX }, 2503 { -90, IWL_RATE_2M_INDEX }, 2504 { S8_MIN, IWL_RATE_1M_INDEX }, 2505 }; 2506 2507 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = { 2508 { -60, IWL_RATE_54M_INDEX }, 2509 { -64, IWL_RATE_48M_INDEX }, 2510 { -72, IWL_RATE_36M_INDEX }, 2511 { -80, IWL_RATE_24M_INDEX }, 2512 { -84, IWL_RATE_18M_INDEX }, 2513 { -85, IWL_RATE_12M_INDEX }, 2514 { -87, IWL_RATE_9M_INDEX }, 2515 { S8_MIN, IWL_RATE_6M_INDEX }, 2516 }; 2517 2518 static const struct rs_init_rate_info rs_optimal_rates_ht[] = { 2519 { -60, IWL_RATE_MCS_7_INDEX }, 2520 { -64, IWL_RATE_MCS_6_INDEX }, 2521 { -68, IWL_RATE_MCS_5_INDEX }, 2522 { -72, IWL_RATE_MCS_4_INDEX }, 2523 { -80, IWL_RATE_MCS_3_INDEX }, 2524 { -84, IWL_RATE_MCS_2_INDEX }, 2525 { -85, IWL_RATE_MCS_1_INDEX }, 2526 { S8_MIN, IWL_RATE_MCS_0_INDEX}, 2527 }; 2528 2529 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = { 2530 { -60, IWL_RATE_MCS_8_INDEX }, 2531 { -64, IWL_RATE_MCS_7_INDEX }, 2532 { -68, IWL_RATE_MCS_6_INDEX }, 2533 { -72, IWL_RATE_MCS_5_INDEX }, 2534 { -80, IWL_RATE_MCS_4_INDEX }, 2535 { -84, IWL_RATE_MCS_3_INDEX }, 2536 { -85, IWL_RATE_MCS_2_INDEX }, 2537 { -87, IWL_RATE_MCS_1_INDEX }, 2538 { S8_MIN, IWL_RATE_MCS_0_INDEX}, 2539 }; 2540 2541 static const struct rs_init_rate_info rs_optimal_rates_vht_40_80mhz[] = { 2542 { -60, IWL_RATE_MCS_9_INDEX }, 2543 { -64, IWL_RATE_MCS_8_INDEX }, 2544 { -68, IWL_RATE_MCS_7_INDEX }, 2545 { -72, IWL_RATE_MCS_6_INDEX }, 2546 { -80, IWL_RATE_MCS_5_INDEX }, 2547 { -84, IWL_RATE_MCS_4_INDEX }, 2548 { -85, IWL_RATE_MCS_3_INDEX }, 2549 { -87, IWL_RATE_MCS_2_INDEX }, 2550 { -88, IWL_RATE_MCS_1_INDEX }, 2551 { S8_MIN, IWL_RATE_MCS_0_INDEX }, 2552 }; 2553 2554 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */ 2555 2556 /* Init the optimal rate based on STA caps 2557 * This combined with rssi is used to report the last tx rate 2558 * to userspace when we haven't transmitted enough frames. 2559 */ 2560 static void rs_init_optimal_rate(struct iwl_mvm *mvm, 2561 struct ieee80211_sta *sta, 2562 struct iwl_lq_sta *lq_sta) 2563 { 2564 struct rs_rate *rate = &lq_sta->optimal_rate; 2565 2566 if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID) 2567 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; 2568 else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID) 2569 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; 2570 else if (lq_sta->band == IEEE80211_BAND_5GHZ) 2571 rate->type = LQ_LEGACY_A; 2572 else 2573 rate->type = LQ_LEGACY_G; 2574 2575 rate->bw = rs_bw_from_sta_bw(sta); 2576 rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL); 2577 2578 /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */ 2579 2580 if (is_mimo(rate)) { 2581 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate; 2582 } else if (is_siso(rate)) { 2583 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate; 2584 } else { 2585 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate; 2586 2587 if (lq_sta->band == IEEE80211_BAND_5GHZ) { 2588 lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy; 2589 lq_sta->optimal_nentries = 2590 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy); 2591 } else { 2592 lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy; 2593 lq_sta->optimal_nentries = 2594 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy); 2595 } 2596 } 2597 2598 if (is_vht(rate)) { 2599 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) { 2600 lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz; 2601 lq_sta->optimal_nentries = 2602 ARRAY_SIZE(rs_optimal_rates_vht_20mhz); 2603 } else { 2604 lq_sta->optimal_rates = rs_optimal_rates_vht_40_80mhz; 2605 lq_sta->optimal_nentries = 2606 ARRAY_SIZE(rs_optimal_rates_vht_40_80mhz); 2607 } 2608 } else if (is_ht(rate)) { 2609 lq_sta->optimal_rates = rs_optimal_rates_ht; 2610 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht); 2611 } 2612 } 2613 2614 /* Compute the optimal rate index based on RSSI */ 2615 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm, 2616 struct iwl_lq_sta *lq_sta) 2617 { 2618 struct rs_rate *rate = &lq_sta->optimal_rate; 2619 int i; 2620 2621 rate->index = find_first_bit(&lq_sta->optimal_rate_mask, 2622 BITS_PER_LONG); 2623 2624 for (i = 0; i < lq_sta->optimal_nentries; i++) { 2625 int rate_idx = lq_sta->optimal_rates[i].rate_idx; 2626 2627 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) && 2628 (BIT(rate_idx) & lq_sta->optimal_rate_mask)) { 2629 rate->index = rate_idx; 2630 break; 2631 } 2632 } 2633 2634 return rate; 2635 } 2636 2637 /* Choose an initial legacy rate and antenna to use based on the RSSI 2638 * of last Rx 2639 */ 2640 static void rs_get_initial_rate(struct iwl_mvm *mvm, 2641 struct ieee80211_sta *sta, 2642 struct iwl_lq_sta *lq_sta, 2643 enum ieee80211_band band, 2644 struct rs_rate *rate) 2645 { 2646 int i, nentries; 2647 unsigned long active_rate; 2648 s8 best_rssi = S8_MIN; 2649 u8 best_ant = ANT_NONE; 2650 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 2651 const struct rs_init_rate_info *initial_rates; 2652 2653 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { 2654 if (!(lq_sta->pers.chains & BIT(i))) 2655 continue; 2656 2657 if (lq_sta->pers.chain_signal[i] > best_rssi) { 2658 best_rssi = lq_sta->pers.chain_signal[i]; 2659 best_ant = BIT(i); 2660 } 2661 } 2662 2663 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n", 2664 rs_pretty_ant(best_ant), best_rssi); 2665 2666 if (best_ant != ANT_A && best_ant != ANT_B) 2667 rate->ant = first_antenna(valid_tx_ant); 2668 else 2669 rate->ant = best_ant; 2670 2671 rate->sgi = false; 2672 rate->ldpc = false; 2673 rate->bw = RATE_MCS_CHAN_WIDTH_20; 2674 2675 rate->index = find_first_bit(&lq_sta->active_legacy_rate, 2676 BITS_PER_LONG); 2677 2678 if (band == IEEE80211_BAND_5GHZ) { 2679 rate->type = LQ_LEGACY_A; 2680 initial_rates = rs_optimal_rates_5ghz_legacy; 2681 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy); 2682 } else { 2683 rate->type = LQ_LEGACY_G; 2684 initial_rates = rs_optimal_rates_24ghz_legacy; 2685 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy); 2686 } 2687 2688 if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE) 2689 goto out; 2690 2691 /* Start from a higher rate if the corresponding debug capability 2692 * is enabled. The rate is chosen according to AP capabilities. 2693 * In case of VHT/HT when the rssi is low fallback to the case of 2694 * legacy rates. 2695 */ 2696 if (sta->vht_cap.vht_supported && 2697 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { 2698 if (sta->bandwidth >= IEEE80211_STA_RX_BW_40) { 2699 initial_rates = rs_optimal_rates_vht_40_80mhz; 2700 nentries = ARRAY_SIZE(rs_optimal_rates_vht_40_80mhz); 2701 if (sta->bandwidth >= IEEE80211_STA_RX_BW_80) 2702 rate->bw = RATE_MCS_CHAN_WIDTH_80; 2703 else 2704 rate->bw = RATE_MCS_CHAN_WIDTH_40; 2705 } else if (sta->bandwidth == IEEE80211_STA_RX_BW_20) { 2706 initial_rates = rs_optimal_rates_vht_20mhz; 2707 nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz); 2708 rate->bw = RATE_MCS_CHAN_WIDTH_20; 2709 } else { 2710 IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth); 2711 goto out; 2712 } 2713 active_rate = lq_sta->active_siso_rate; 2714 rate->type = LQ_VHT_SISO; 2715 } else if (sta->ht_cap.ht_supported && 2716 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { 2717 initial_rates = rs_optimal_rates_ht; 2718 nentries = ARRAY_SIZE(rs_optimal_rates_ht); 2719 active_rate = lq_sta->active_siso_rate; 2720 rate->type = LQ_HT_SISO; 2721 } else { 2722 active_rate = lq_sta->active_legacy_rate; 2723 } 2724 2725 for (i = 0; i < nentries; i++) { 2726 int rate_idx = initial_rates[i].rate_idx; 2727 2728 if ((best_rssi >= initial_rates[i].rssi) && 2729 (BIT(rate_idx) & active_rate)) { 2730 rate->index = rate_idx; 2731 break; 2732 } 2733 } 2734 2735 out: 2736 rs_dump_rate(mvm, rate, "INITIAL"); 2737 } 2738 2739 /* Save info about RSSI of last Rx */ 2740 void rs_update_last_rssi(struct iwl_mvm *mvm, 2741 struct iwl_lq_sta *lq_sta, 2742 struct ieee80211_rx_status *rx_status) 2743 { 2744 int i; 2745 2746 lq_sta->pers.chains = rx_status->chains; 2747 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0]; 2748 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1]; 2749 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2]; 2750 lq_sta->pers.last_rssi = S8_MIN; 2751 2752 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { 2753 if (!(lq_sta->pers.chains & BIT(i))) 2754 continue; 2755 2756 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi) 2757 lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i]; 2758 } 2759 } 2760 2761 /** 2762 * rs_initialize_lq - Initialize a station's hardware rate table 2763 * 2764 * The uCode's station table contains a table of fallback rates 2765 * for automatic fallback during transmission. 2766 * 2767 * NOTE: This sets up a default set of values. These will be replaced later 2768 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of 2769 * rc80211_simple. 2770 * 2771 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before 2772 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD, 2773 * which requires station table entry to exist). 2774 */ 2775 static void rs_initialize_lq(struct iwl_mvm *mvm, 2776 struct ieee80211_sta *sta, 2777 struct iwl_lq_sta *lq_sta, 2778 enum ieee80211_band band, 2779 bool init) 2780 { 2781 struct iwl_scale_tbl_info *tbl; 2782 struct rs_rate *rate; 2783 u8 active_tbl = 0; 2784 2785 if (!sta || !lq_sta) 2786 return; 2787 2788 if (!lq_sta->search_better_tbl) 2789 active_tbl = lq_sta->active_tbl; 2790 else 2791 active_tbl = 1 - lq_sta->active_tbl; 2792 2793 tbl = &(lq_sta->lq_info[active_tbl]); 2794 rate = &tbl->rate; 2795 2796 rs_get_initial_rate(mvm, sta, lq_sta, band, rate); 2797 rs_init_optimal_rate(mvm, sta, lq_sta); 2798 2799 WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B); 2800 tbl->column = rs_get_column_from_rate(rate); 2801 2802 rs_set_expected_tpt_table(lq_sta, tbl); 2803 rs_fill_lq_cmd(mvm, sta, lq_sta, rate); 2804 /* TODO restore station should remember the lq cmd */ 2805 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init); 2806 } 2807 2808 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta, 2809 struct ieee80211_tx_rate_control *txrc) 2810 { 2811 struct sk_buff *skb = txrc->skb; 2812 struct iwl_op_mode *op_mode __maybe_unused = 2813 (struct iwl_op_mode *)mvm_r; 2814 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 2815 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2816 struct iwl_lq_sta *lq_sta = mvm_sta; 2817 struct rs_rate *optimal_rate; 2818 u32 last_ucode_rate; 2819 2820 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) { 2821 /* if vif isn't initialized mvm doesn't know about 2822 * this station, so don't do anything with the it 2823 */ 2824 sta = NULL; 2825 mvm_sta = NULL; 2826 } 2827 2828 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2829 2830 /* Treat uninitialized rate scaling data same as non-existing. */ 2831 if (lq_sta && !lq_sta->pers.drv) { 2832 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n"); 2833 mvm_sta = NULL; 2834 } 2835 2836 /* Send management frames and NO_ACK data using lowest rate. */ 2837 if (rate_control_send_low(sta, mvm_sta, txrc)) 2838 return; 2839 2840 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags, 2841 info->band, &info->control.rates[0]); 2842 info->control.rates[0].count = 1; 2843 2844 /* Report the optimal rate based on rssi and STA caps if we haven't 2845 * converged yet (too little traffic) or exploring other modulations 2846 */ 2847 if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) { 2848 optimal_rate = rs_get_optimal_rate(mvm, lq_sta); 2849 last_ucode_rate = ucode_rate_from_rs_rate(mvm, 2850 optimal_rate); 2851 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band, 2852 &txrc->reported_rate); 2853 } 2854 } 2855 2856 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta, 2857 gfp_t gfp) 2858 { 2859 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta); 2860 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate; 2861 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 2862 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta; 2863 2864 IWL_DEBUG_RATE(mvm, "create station rate scale window\n"); 2865 2866 lq_sta->pers.drv = mvm; 2867 #ifdef CONFIG_MAC80211_DEBUGFS 2868 lq_sta->pers.dbg_fixed_rate = 0; 2869 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID; 2870 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 2871 #endif 2872 lq_sta->pers.chains = 0; 2873 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal)); 2874 lq_sta->pers.last_rssi = S8_MIN; 2875 2876 return &sta_priv->lq_sta; 2877 } 2878 2879 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap, 2880 int nss) 2881 { 2882 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) & 2883 (0x3 << (2 * (nss - 1))); 2884 rx_mcs >>= (2 * (nss - 1)); 2885 2886 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7) 2887 return IWL_RATE_MCS_7_INDEX; 2888 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8) 2889 return IWL_RATE_MCS_8_INDEX; 2890 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9) 2891 return IWL_RATE_MCS_9_INDEX; 2892 2893 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED); 2894 return -1; 2895 } 2896 2897 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta, 2898 struct ieee80211_sta_vht_cap *vht_cap, 2899 struct iwl_lq_sta *lq_sta) 2900 { 2901 int i; 2902 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1); 2903 2904 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 2905 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 2906 if (i == IWL_RATE_9M_INDEX) 2907 continue; 2908 2909 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 2910 if (i == IWL_RATE_MCS_9_INDEX && 2911 sta->bandwidth == IEEE80211_STA_RX_BW_20) 2912 continue; 2913 2914 lq_sta->active_siso_rate |= BIT(i); 2915 } 2916 } 2917 2918 if (sta->rx_nss < 2) 2919 return; 2920 2921 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2); 2922 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 2923 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 2924 if (i == IWL_RATE_9M_INDEX) 2925 continue; 2926 2927 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 2928 if (i == IWL_RATE_MCS_9_INDEX && 2929 sta->bandwidth == IEEE80211_STA_RX_BW_20) 2930 continue; 2931 2932 lq_sta->active_mimo2_rate |= BIT(i); 2933 } 2934 } 2935 } 2936 2937 static void rs_ht_init(struct iwl_mvm *mvm, 2938 struct ieee80211_sta *sta, 2939 struct iwl_lq_sta *lq_sta, 2940 struct ieee80211_sta_ht_cap *ht_cap) 2941 { 2942 /* active_siso_rate mask includes 9 MBits (bit 5), 2943 * and CCK (bits 0-3), supp_rates[] does not; 2944 * shift to convert format, force 9 MBits off. 2945 */ 2946 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1; 2947 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1; 2948 lq_sta->active_siso_rate &= ~((u16)0x2); 2949 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE; 2950 2951 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1; 2952 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1; 2953 lq_sta->active_mimo2_rate &= ~((u16)0x2); 2954 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE; 2955 2956 if (mvm->cfg->ht_params->ldpc && 2957 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING)) 2958 lq_sta->ldpc = true; 2959 2960 if (mvm->cfg->ht_params->stbc && 2961 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 2962 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC)) 2963 lq_sta->stbc_capable = true; 2964 2965 lq_sta->is_vht = false; 2966 } 2967 2968 static void rs_vht_init(struct iwl_mvm *mvm, 2969 struct ieee80211_sta *sta, 2970 struct iwl_lq_sta *lq_sta, 2971 struct ieee80211_sta_vht_cap *vht_cap) 2972 { 2973 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta); 2974 2975 if (mvm->cfg->ht_params->ldpc && 2976 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC)) 2977 lq_sta->ldpc = true; 2978 2979 if (mvm->cfg->ht_params->stbc && 2980 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 2981 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK)) 2982 lq_sta->stbc_capable = true; 2983 2984 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) && 2985 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 2986 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE)) 2987 lq_sta->bfer_capable = true; 2988 2989 lq_sta->is_vht = true; 2990 } 2991 2992 #ifdef CONFIG_IWLWIFI_DEBUGFS 2993 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm) 2994 { 2995 spin_lock_bh(&mvm->drv_stats_lock); 2996 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats)); 2997 spin_unlock_bh(&mvm->drv_stats_lock); 2998 } 2999 3000 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg) 3001 { 3002 u8 nss = 0, mcs = 0; 3003 3004 spin_lock(&mvm->drv_stats_lock); 3005 3006 if (agg) 3007 mvm->drv_rx_stats.agg_frames++; 3008 3009 mvm->drv_rx_stats.success_frames++; 3010 3011 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { 3012 case RATE_MCS_CHAN_WIDTH_20: 3013 mvm->drv_rx_stats.bw_20_frames++; 3014 break; 3015 case RATE_MCS_CHAN_WIDTH_40: 3016 mvm->drv_rx_stats.bw_40_frames++; 3017 break; 3018 case RATE_MCS_CHAN_WIDTH_80: 3019 mvm->drv_rx_stats.bw_80_frames++; 3020 break; 3021 default: 3022 WARN_ONCE(1, "bad BW. rate 0x%x", rate); 3023 } 3024 3025 if (rate & RATE_MCS_HT_MSK) { 3026 mvm->drv_rx_stats.ht_frames++; 3027 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK; 3028 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1; 3029 } else if (rate & RATE_MCS_VHT_MSK) { 3030 mvm->drv_rx_stats.vht_frames++; 3031 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK; 3032 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >> 3033 RATE_VHT_MCS_NSS_POS) + 1; 3034 } else { 3035 mvm->drv_rx_stats.legacy_frames++; 3036 } 3037 3038 if (nss == 1) 3039 mvm->drv_rx_stats.siso_frames++; 3040 else if (nss == 2) 3041 mvm->drv_rx_stats.mimo2_frames++; 3042 3043 if (rate & RATE_MCS_SGI_MSK) 3044 mvm->drv_rx_stats.sgi_frames++; 3045 else 3046 mvm->drv_rx_stats.ngi_frames++; 3047 3048 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate; 3049 mvm->drv_rx_stats.last_frame_idx = 3050 (mvm->drv_rx_stats.last_frame_idx + 1) % 3051 ARRAY_SIZE(mvm->drv_rx_stats.last_rates); 3052 3053 spin_unlock(&mvm->drv_stats_lock); 3054 } 3055 #endif 3056 3057 /* 3058 * Called after adding a new station to initialize rate scaling 3059 */ 3060 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 3061 enum ieee80211_band band, bool init) 3062 { 3063 int i, j; 3064 struct ieee80211_hw *hw = mvm->hw; 3065 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 3066 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; 3067 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta); 3068 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta; 3069 struct ieee80211_supported_band *sband; 3070 unsigned long supp; /* must be unsigned long for for_each_set_bit */ 3071 3072 /* clear all non-persistent lq data */ 3073 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers)); 3074 3075 sband = hw->wiphy->bands[band]; 3076 3077 lq_sta->lq.sta_id = sta_priv->sta_id; 3078 3079 for (j = 0; j < LQ_SIZE; j++) 3080 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]); 3081 3082 lq_sta->flush_timer = 0; 3083 lq_sta->last_tx = jiffies; 3084 3085 IWL_DEBUG_RATE(mvm, 3086 "LQ: *** rate scale station global init for station %d ***\n", 3087 sta_priv->sta_id); 3088 /* TODO: what is a good starting rate for STA? About middle? Maybe not 3089 * the lowest or the highest rate.. Could consider using RSSI from 3090 * previous packets? Need to have IEEE 802.1X auth succeed immediately 3091 * after assoc.. */ 3092 3093 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX; 3094 lq_sta->band = sband->band; 3095 /* 3096 * active legacy rates as per supported rates bitmap 3097 */ 3098 supp = sta->supp_rates[sband->band]; 3099 lq_sta->active_legacy_rate = 0; 3100 for_each_set_bit(i, &supp, BITS_PER_LONG) 3101 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value); 3102 3103 /* TODO: should probably account for rx_highest for both HT/VHT */ 3104 if (!vht_cap || !vht_cap->vht_supported) 3105 rs_ht_init(mvm, sta, lq_sta, ht_cap); 3106 else 3107 rs_vht_init(mvm, sta, lq_sta, vht_cap); 3108 3109 lq_sta->max_legacy_rate_idx = 3110 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate); 3111 lq_sta->max_siso_rate_idx = 3112 rs_get_max_rate_from_mask(lq_sta->active_siso_rate); 3113 lq_sta->max_mimo2_rate_idx = 3114 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate); 3115 3116 IWL_DEBUG_RATE(mvm, 3117 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n", 3118 lq_sta->active_legacy_rate, 3119 lq_sta->active_siso_rate, 3120 lq_sta->active_mimo2_rate, 3121 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable, 3122 lq_sta->bfer_capable); 3123 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n", 3124 lq_sta->max_legacy_rate_idx, 3125 lq_sta->max_siso_rate_idx, 3126 lq_sta->max_mimo2_rate_idx); 3127 3128 /* These values will be overridden later */ 3129 lq_sta->lq.single_stream_ant_msk = 3130 first_antenna(iwl_mvm_get_valid_tx_ant(mvm)); 3131 lq_sta->lq.dual_stream_ant_msk = ANT_AB; 3132 3133 /* as default allow aggregation for all tids */ 3134 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID; 3135 lq_sta->is_agg = 0; 3136 #ifdef CONFIG_IWLWIFI_DEBUGFS 3137 iwl_mvm_reset_frame_stats(mvm); 3138 #endif 3139 rs_initialize_lq(mvm, sta, lq_sta, band, init); 3140 } 3141 3142 static void rs_rate_update(void *mvm_r, 3143 struct ieee80211_supported_band *sband, 3144 struct cfg80211_chan_def *chandef, 3145 struct ieee80211_sta *sta, void *priv_sta, 3146 u32 changed) 3147 { 3148 u8 tid; 3149 struct iwl_op_mode *op_mode = 3150 (struct iwl_op_mode *)mvm_r; 3151 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 3152 3153 if (!iwl_mvm_sta_from_mac80211(sta)->vif) 3154 return; 3155 3156 /* Stop any ongoing aggregations as rs starts off assuming no agg */ 3157 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++) 3158 ieee80211_stop_tx_ba_session(sta, tid); 3159 3160 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false); 3161 } 3162 3163 #ifdef CONFIG_MAC80211_DEBUGFS 3164 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm, 3165 struct iwl_lq_cmd *lq_cmd, 3166 enum ieee80211_band band, 3167 u32 ucode_rate) 3168 { 3169 struct rs_rate rate; 3170 int i; 3171 int num_rates = ARRAY_SIZE(lq_cmd->rs_table); 3172 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate); 3173 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; 3174 3175 for (i = 0; i < num_rates; i++) 3176 lq_cmd->rs_table[i] = ucode_rate_le32; 3177 3178 rs_rate_from_ucode_rate(ucode_rate, band, &rate); 3179 3180 if (is_mimo(&rate)) 3181 lq_cmd->mimo_delim = num_rates - 1; 3182 else 3183 lq_cmd->mimo_delim = 0; 3184 3185 lq_cmd->reduced_tpc = 0; 3186 3187 if (num_of_ant(ant) == 1) 3188 lq_cmd->single_stream_ant_msk = ant; 3189 3190 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF; 3191 } 3192 #endif /* CONFIG_MAC80211_DEBUGFS */ 3193 3194 static void rs_fill_rates_for_column(struct iwl_mvm *mvm, 3195 struct iwl_lq_sta *lq_sta, 3196 struct rs_rate *rate, 3197 __le32 *rs_table, int *rs_table_index, 3198 int num_rates, int num_retries, 3199 u8 valid_tx_ant, bool toggle_ant) 3200 { 3201 int i, j; 3202 __le32 ucode_rate; 3203 bool bottom_reached = false; 3204 int prev_rate_idx = rate->index; 3205 int end = LINK_QUAL_MAX_RETRY_NUM; 3206 int index = *rs_table_index; 3207 3208 for (i = 0; i < num_rates && index < end; i++) { 3209 for (j = 0; j < num_retries && index < end; j++, index++) { 3210 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm, 3211 rate)); 3212 rs_table[index] = ucode_rate; 3213 if (toggle_ant) 3214 rs_toggle_antenna(valid_tx_ant, rate); 3215 } 3216 3217 prev_rate_idx = rate->index; 3218 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate); 3219 if (bottom_reached && !is_legacy(rate)) 3220 break; 3221 } 3222 3223 if (!bottom_reached && !is_legacy(rate)) 3224 rate->index = prev_rate_idx; 3225 3226 *rs_table_index = index; 3227 } 3228 3229 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI 3230 * column the rate table should look like this: 3231 * 3232 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 3233 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 3234 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 3235 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 3236 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 3237 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 3238 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI 3239 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI 3240 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI 3241 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps 3242 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps 3243 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps 3244 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps 3245 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps 3246 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps 3247 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps 3248 */ 3249 static void rs_build_rates_table(struct iwl_mvm *mvm, 3250 struct ieee80211_sta *sta, 3251 struct iwl_lq_sta *lq_sta, 3252 const struct rs_rate *initial_rate) 3253 { 3254 struct rs_rate rate; 3255 int num_rates, num_retries, index = 0; 3256 u8 valid_tx_ant = 0; 3257 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3258 bool toggle_ant = false; 3259 3260 memcpy(&rate, initial_rate, sizeof(rate)); 3261 3262 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 3263 3264 /* TODO: remove old API when min FW API hits 14 */ 3265 if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) && 3266 rs_stbc_allow(mvm, sta, lq_sta)) 3267 rate.stbc = true; 3268 3269 if (is_siso(&rate)) { 3270 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES; 3271 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3272 } else if (is_mimo(&rate)) { 3273 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES; 3274 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3275 } else { 3276 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES; 3277 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES; 3278 toggle_ant = true; 3279 } 3280 3281 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3282 num_rates, num_retries, valid_tx_ant, 3283 toggle_ant); 3284 3285 rs_get_lower_rate_down_column(lq_sta, &rate); 3286 3287 if (is_siso(&rate)) { 3288 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES; 3289 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES; 3290 lq_cmd->mimo_delim = index; 3291 } else if (is_legacy(&rate)) { 3292 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3293 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3294 } else { 3295 WARN_ON_ONCE(1); 3296 } 3297 3298 toggle_ant = true; 3299 3300 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3301 num_rates, num_retries, valid_tx_ant, 3302 toggle_ant); 3303 3304 rs_get_lower_rate_down_column(lq_sta, &rate); 3305 3306 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3307 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3308 3309 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3310 num_rates, num_retries, valid_tx_ant, 3311 toggle_ant); 3312 3313 } 3314 3315 struct rs_bfer_active_iter_data { 3316 struct ieee80211_sta *exclude_sta; 3317 struct iwl_mvm_sta *bfer_mvmsta; 3318 }; 3319 3320 static void rs_bfer_active_iter(void *_data, 3321 struct ieee80211_sta *sta) 3322 { 3323 struct rs_bfer_active_iter_data *data = _data; 3324 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3325 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq; 3326 u32 ss_params = le32_to_cpu(lq_cmd->ss_params); 3327 3328 if (sta == data->exclude_sta) 3329 return; 3330 3331 /* The current sta has BFER allowed */ 3332 if (ss_params & LQ_SS_BFER_ALLOWED) { 3333 WARN_ON_ONCE(data->bfer_mvmsta != NULL); 3334 3335 data->bfer_mvmsta = mvmsta; 3336 } 3337 } 3338 3339 static int rs_bfer_priority(struct iwl_mvm_sta *sta) 3340 { 3341 int prio = -1; 3342 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif); 3343 3344 switch (viftype) { 3345 case NL80211_IFTYPE_AP: 3346 case NL80211_IFTYPE_P2P_GO: 3347 prio = 3; 3348 break; 3349 case NL80211_IFTYPE_P2P_CLIENT: 3350 prio = 2; 3351 break; 3352 case NL80211_IFTYPE_STATION: 3353 prio = 1; 3354 break; 3355 default: 3356 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id); 3357 prio = -1; 3358 } 3359 3360 return prio; 3361 } 3362 3363 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */ 3364 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1, 3365 struct iwl_mvm_sta *sta2) 3366 { 3367 int prio1 = rs_bfer_priority(sta1); 3368 int prio2 = rs_bfer_priority(sta2); 3369 3370 if (prio1 > prio2) 3371 return 1; 3372 if (prio1 < prio2) 3373 return -1; 3374 return 0; 3375 } 3376 3377 static void rs_set_lq_ss_params(struct iwl_mvm *mvm, 3378 struct ieee80211_sta *sta, 3379 struct iwl_lq_sta *lq_sta, 3380 const struct rs_rate *initial_rate) 3381 { 3382 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3383 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3384 struct rs_bfer_active_iter_data data = { 3385 .exclude_sta = sta, 3386 .bfer_mvmsta = NULL, 3387 }; 3388 struct iwl_mvm_sta *bfer_mvmsta = NULL; 3389 u32 ss_params = LQ_SS_PARAMS_VALID; 3390 3391 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 3392 goto out; 3393 3394 #ifdef CONFIG_MAC80211_DEBUGFS 3395 /* Check if forcing the decision is configured. 3396 * Note that SISO is forced by not allowing STBC or BFER 3397 */ 3398 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC) 3399 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE); 3400 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER) 3401 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE); 3402 3403 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) { 3404 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n", 3405 lq_sta->pers.ss_force); 3406 goto out; 3407 } 3408 #endif 3409 3410 if (lq_sta->stbc_capable) 3411 ss_params |= LQ_SS_STBC_1SS_ALLOWED; 3412 3413 if (!lq_sta->bfer_capable) 3414 goto out; 3415 3416 ieee80211_iterate_stations_atomic(mvm->hw, 3417 rs_bfer_active_iter, 3418 &data); 3419 bfer_mvmsta = data.bfer_mvmsta; 3420 3421 /* This code is safe as it doesn't run concurrently for different 3422 * stations. This is guaranteed by the fact that calls to 3423 * ieee80211_tx_status wouldn't run concurrently for a single HW. 3424 */ 3425 if (!bfer_mvmsta) { 3426 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n"); 3427 3428 ss_params |= LQ_SS_BFER_ALLOWED; 3429 goto out; 3430 } 3431 3432 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n", 3433 bfer_mvmsta->sta_id); 3434 3435 /* Disallow BFER on another STA if active and we're a higher priority */ 3436 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) { 3437 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq; 3438 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params); 3439 3440 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED; 3441 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params); 3442 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false); 3443 3444 ss_params |= LQ_SS_BFER_ALLOWED; 3445 IWL_DEBUG_RATE(mvm, 3446 "Lower priority BFER sta found (%d). Switch BFER\n", 3447 bfer_mvmsta->sta_id); 3448 } 3449 out: 3450 lq_cmd->ss_params = cpu_to_le32(ss_params); 3451 } 3452 3453 static void rs_fill_lq_cmd(struct iwl_mvm *mvm, 3454 struct ieee80211_sta *sta, 3455 struct iwl_lq_sta *lq_sta, 3456 const struct rs_rate *initial_rate) 3457 { 3458 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3459 struct iwl_mvm_sta *mvmsta; 3460 struct iwl_mvm_vif *mvmvif; 3461 3462 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START; 3463 lq_cmd->agg_time_limit = 3464 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT); 3465 3466 #ifdef CONFIG_MAC80211_DEBUGFS 3467 if (lq_sta->pers.dbg_fixed_rate) { 3468 rs_build_rates_table_from_fixed(mvm, lq_cmd, 3469 lq_sta->band, 3470 lq_sta->pers.dbg_fixed_rate); 3471 return; 3472 } 3473 #endif 3474 if (WARN_ON_ONCE(!sta || !initial_rate)) 3475 return; 3476 3477 rs_build_rates_table(mvm, sta, lq_sta, initial_rate); 3478 3479 if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS)) 3480 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate); 3481 3482 mvmsta = iwl_mvm_sta_from_mac80211(sta); 3483 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif); 3484 3485 if (num_of_ant(initial_rate->ant) == 1) 3486 lq_cmd->single_stream_ant_msk = initial_rate->ant; 3487 3488 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize; 3489 3490 /* 3491 * In case of low latency, tell the firmware to leave a frame in the 3492 * Tx Fifo so that it can start a transaction in the same TxOP. This 3493 * basically allows the firmware to send bursts. 3494 */ 3495 if (iwl_mvm_vif_low_latency(mvmvif)) 3496 lq_cmd->agg_frame_cnt_limit--; 3497 3498 if (mvmsta->vif->p2p) 3499 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK; 3500 3501 lq_cmd->agg_time_limit = 3502 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta)); 3503 } 3504 3505 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) 3506 { 3507 return hw->priv; 3508 } 3509 /* rate scale requires free function to be implemented */ 3510 static void rs_free(void *mvm_rate) 3511 { 3512 return; 3513 } 3514 3515 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, 3516 void *mvm_sta) 3517 { 3518 struct iwl_op_mode *op_mode __maybe_unused = mvm_r; 3519 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 3520 3521 IWL_DEBUG_RATE(mvm, "enter\n"); 3522 IWL_DEBUG_RATE(mvm, "leave\n"); 3523 } 3524 3525 #ifdef CONFIG_MAC80211_DEBUGFS 3526 int rs_pretty_print_rate(char *buf, const u32 rate) 3527 { 3528 3529 char *type, *bw; 3530 u8 mcs = 0, nss = 0; 3531 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; 3532 3533 if (!(rate & RATE_MCS_HT_MSK) && 3534 !(rate & RATE_MCS_VHT_MSK)) { 3535 int index = iwl_hwrate_to_plcp_idx(rate); 3536 3537 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n", 3538 rs_pretty_ant(ant), 3539 index == IWL_RATE_INVALID ? "BAD" : 3540 iwl_rate_mcs[index].mbps); 3541 } 3542 3543 if (rate & RATE_MCS_VHT_MSK) { 3544 type = "VHT"; 3545 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK; 3546 nss = ((rate & RATE_VHT_MCS_NSS_MSK) 3547 >> RATE_VHT_MCS_NSS_POS) + 1; 3548 } else if (rate & RATE_MCS_HT_MSK) { 3549 type = "HT"; 3550 mcs = rate & RATE_HT_MCS_INDEX_MSK; 3551 } else { 3552 type = "Unknown"; /* shouldn't happen */ 3553 } 3554 3555 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { 3556 case RATE_MCS_CHAN_WIDTH_20: 3557 bw = "20Mhz"; 3558 break; 3559 case RATE_MCS_CHAN_WIDTH_40: 3560 bw = "40Mhz"; 3561 break; 3562 case RATE_MCS_CHAN_WIDTH_80: 3563 bw = "80Mhz"; 3564 break; 3565 case RATE_MCS_CHAN_WIDTH_160: 3566 bw = "160Mhz"; 3567 break; 3568 default: 3569 bw = "BAD BW"; 3570 } 3571 3572 return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n", 3573 type, rs_pretty_ant(ant), bw, mcs, nss, 3574 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ", 3575 (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "", 3576 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "", 3577 (rate & RATE_MCS_BF_MSK) ? "BF " : "", 3578 (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : ""); 3579 } 3580 3581 /** 3582 * Program the device to use fixed rate for frame transmit 3583 * This is for debugging/testing only 3584 * once the device start use fixed rate, we need to reload the module 3585 * to being back the normal operation. 3586 */ 3587 static void rs_program_fix_rate(struct iwl_mvm *mvm, 3588 struct iwl_lq_sta *lq_sta) 3589 { 3590 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */ 3591 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3592 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3593 3594 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n", 3595 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate); 3596 3597 if (lq_sta->pers.dbg_fixed_rate) { 3598 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL); 3599 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false); 3600 } 3601 } 3602 3603 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file, 3604 const char __user *user_buf, size_t count, loff_t *ppos) 3605 { 3606 struct iwl_lq_sta *lq_sta = file->private_data; 3607 struct iwl_mvm *mvm; 3608 char buf[64]; 3609 size_t buf_size; 3610 u32 parsed_rate; 3611 3612 mvm = lq_sta->pers.drv; 3613 memset(buf, 0, sizeof(buf)); 3614 buf_size = min(count, sizeof(buf) - 1); 3615 if (copy_from_user(buf, user_buf, buf_size)) 3616 return -EFAULT; 3617 3618 if (sscanf(buf, "%x", &parsed_rate) == 1) 3619 lq_sta->pers.dbg_fixed_rate = parsed_rate; 3620 else 3621 lq_sta->pers.dbg_fixed_rate = 0; 3622 3623 rs_program_fix_rate(mvm, lq_sta); 3624 3625 return count; 3626 } 3627 3628 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file, 3629 char __user *user_buf, size_t count, loff_t *ppos) 3630 { 3631 char *buff; 3632 int desc = 0; 3633 int i = 0; 3634 ssize_t ret; 3635 3636 struct iwl_lq_sta *lq_sta = file->private_data; 3637 struct iwl_mvm *mvm; 3638 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 3639 struct rs_rate *rate = &tbl->rate; 3640 u32 ss_params; 3641 mvm = lq_sta->pers.drv; 3642 buff = kmalloc(2048, GFP_KERNEL); 3643 if (!buff) 3644 return -ENOMEM; 3645 3646 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id); 3647 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n", 3648 lq_sta->total_failed, lq_sta->total_success, 3649 lq_sta->active_legacy_rate); 3650 desc += sprintf(buff+desc, "fixed rate 0x%X\n", 3651 lq_sta->pers.dbg_fixed_rate); 3652 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n", 3653 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "", 3654 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "", 3655 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : ""); 3656 desc += sprintf(buff+desc, "lq type %s\n", 3657 (is_legacy(rate)) ? "legacy" : 3658 is_vht(rate) ? "VHT" : "HT"); 3659 if (!is_legacy(rate)) { 3660 desc += sprintf(buff + desc, " %s", 3661 (is_siso(rate)) ? "SISO" : "MIMO2"); 3662 desc += sprintf(buff + desc, " %s", 3663 (is_ht20(rate)) ? "20MHz" : 3664 (is_ht40(rate)) ? "40MHz" : 3665 (is_ht80(rate)) ? "80Mhz" : "BAD BW"); 3666 desc += sprintf(buff + desc, " %s %s %s\n", 3667 (rate->sgi) ? "SGI" : "NGI", 3668 (rate->ldpc) ? "LDPC" : "BCC", 3669 (lq_sta->is_agg) ? "AGG on" : ""); 3670 } 3671 desc += sprintf(buff+desc, "last tx rate=0x%X\n", 3672 lq_sta->last_rate_n_flags); 3673 desc += sprintf(buff+desc, 3674 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n", 3675 lq_sta->lq.flags, 3676 lq_sta->lq.mimo_delim, 3677 lq_sta->lq.single_stream_ant_msk, 3678 lq_sta->lq.dual_stream_ant_msk); 3679 3680 desc += sprintf(buff+desc, 3681 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n", 3682 le16_to_cpu(lq_sta->lq.agg_time_limit), 3683 lq_sta->lq.agg_disable_start_th, 3684 lq_sta->lq.agg_frame_cnt_limit); 3685 3686 desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc); 3687 ss_params = le32_to_cpu(lq_sta->lq.ss_params); 3688 desc += sprintf(buff+desc, "single stream params: %s%s%s%s\n", 3689 (ss_params & LQ_SS_PARAMS_VALID) ? 3690 "VALID" : "INVALID", 3691 (ss_params & LQ_SS_BFER_ALLOWED) ? 3692 ", BFER" : "", 3693 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ? 3694 ", STBC" : "", 3695 (ss_params & LQ_SS_FORCE) ? 3696 ", FORCE" : ""); 3697 desc += sprintf(buff+desc, 3698 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n", 3699 lq_sta->lq.initial_rate_index[0], 3700 lq_sta->lq.initial_rate_index[1], 3701 lq_sta->lq.initial_rate_index[2], 3702 lq_sta->lq.initial_rate_index[3]); 3703 3704 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) { 3705 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]); 3706 3707 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r); 3708 desc += rs_pretty_print_rate(buff+desc, r); 3709 } 3710 3711 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3712 kfree(buff); 3713 return ret; 3714 } 3715 3716 static const struct file_operations rs_sta_dbgfs_scale_table_ops = { 3717 .write = rs_sta_dbgfs_scale_table_write, 3718 .read = rs_sta_dbgfs_scale_table_read, 3719 .open = simple_open, 3720 .llseek = default_llseek, 3721 }; 3722 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file, 3723 char __user *user_buf, size_t count, loff_t *ppos) 3724 { 3725 char *buff; 3726 int desc = 0; 3727 int i, j; 3728 ssize_t ret; 3729 struct iwl_scale_tbl_info *tbl; 3730 struct rs_rate *rate; 3731 struct iwl_lq_sta *lq_sta = file->private_data; 3732 3733 buff = kmalloc(1024, GFP_KERNEL); 3734 if (!buff) 3735 return -ENOMEM; 3736 3737 for (i = 0; i < LQ_SIZE; i++) { 3738 tbl = &(lq_sta->lq_info[i]); 3739 rate = &tbl->rate; 3740 desc += sprintf(buff+desc, 3741 "%s type=%d SGI=%d BW=%s DUP=0\n" 3742 "index=%d\n", 3743 lq_sta->active_tbl == i ? "*" : "x", 3744 rate->type, 3745 rate->sgi, 3746 is_ht20(rate) ? "20Mhz" : 3747 is_ht40(rate) ? "40Mhz" : 3748 is_ht80(rate) ? "80Mhz" : "ERR", 3749 rate->index); 3750 for (j = 0; j < IWL_RATE_COUNT; j++) { 3751 desc += sprintf(buff+desc, 3752 "counter=%d success=%d %%=%d\n", 3753 tbl->win[j].counter, 3754 tbl->win[j].success_counter, 3755 tbl->win[j].success_ratio); 3756 } 3757 } 3758 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3759 kfree(buff); 3760 return ret; 3761 } 3762 3763 static const struct file_operations rs_sta_dbgfs_stats_table_ops = { 3764 .read = rs_sta_dbgfs_stats_table_read, 3765 .open = simple_open, 3766 .llseek = default_llseek, 3767 }; 3768 3769 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file, 3770 char __user *user_buf, 3771 size_t count, loff_t *ppos) 3772 { 3773 static const char * const column_name[] = { 3774 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A", 3775 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B", 3776 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A", 3777 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B", 3778 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI", 3779 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI", 3780 [RS_COLUMN_MIMO2] = "MIMO2", 3781 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI", 3782 }; 3783 3784 static const char * const rate_name[] = { 3785 [IWL_RATE_1M_INDEX] = "1M", 3786 [IWL_RATE_2M_INDEX] = "2M", 3787 [IWL_RATE_5M_INDEX] = "5.5M", 3788 [IWL_RATE_11M_INDEX] = "11M", 3789 [IWL_RATE_6M_INDEX] = "6M|MCS0", 3790 [IWL_RATE_9M_INDEX] = "9M", 3791 [IWL_RATE_12M_INDEX] = "12M|MCS1", 3792 [IWL_RATE_18M_INDEX] = "18M|MCS2", 3793 [IWL_RATE_24M_INDEX] = "24M|MCS3", 3794 [IWL_RATE_36M_INDEX] = "36M|MCS4", 3795 [IWL_RATE_48M_INDEX] = "48M|MCS5", 3796 [IWL_RATE_54M_INDEX] = "54M|MCS6", 3797 [IWL_RATE_MCS_7_INDEX] = "MCS7", 3798 [IWL_RATE_MCS_8_INDEX] = "MCS8", 3799 [IWL_RATE_MCS_9_INDEX] = "MCS9", 3800 }; 3801 3802 char *buff, *pos, *endpos; 3803 int col, rate; 3804 ssize_t ret; 3805 struct iwl_lq_sta *lq_sta = file->private_data; 3806 struct rs_rate_stats *stats; 3807 static const size_t bufsz = 1024; 3808 3809 buff = kmalloc(bufsz, GFP_KERNEL); 3810 if (!buff) 3811 return -ENOMEM; 3812 3813 pos = buff; 3814 endpos = pos + bufsz; 3815 3816 pos += scnprintf(pos, endpos - pos, "COLUMN,"); 3817 for (rate = 0; rate < IWL_RATE_COUNT; rate++) 3818 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]); 3819 pos += scnprintf(pos, endpos - pos, "\n"); 3820 3821 for (col = 0; col < RS_COLUMN_COUNT; col++) { 3822 pos += scnprintf(pos, endpos - pos, 3823 "%s,", column_name[col]); 3824 3825 for (rate = 0; rate < IWL_RATE_COUNT; rate++) { 3826 stats = &(lq_sta->pers.tx_stats[col][rate]); 3827 pos += scnprintf(pos, endpos - pos, 3828 "%llu/%llu,", 3829 stats->success, 3830 stats->total); 3831 } 3832 pos += scnprintf(pos, endpos - pos, "\n"); 3833 } 3834 3835 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff); 3836 kfree(buff); 3837 return ret; 3838 } 3839 3840 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file, 3841 const char __user *user_buf, 3842 size_t count, loff_t *ppos) 3843 { 3844 struct iwl_lq_sta *lq_sta = file->private_data; 3845 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats)); 3846 3847 return count; 3848 } 3849 3850 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = { 3851 .read = rs_sta_dbgfs_drv_tx_stats_read, 3852 .write = rs_sta_dbgfs_drv_tx_stats_write, 3853 .open = simple_open, 3854 .llseek = default_llseek, 3855 }; 3856 3857 static ssize_t iwl_dbgfs_ss_force_read(struct file *file, 3858 char __user *user_buf, 3859 size_t count, loff_t *ppos) 3860 { 3861 struct iwl_lq_sta *lq_sta = file->private_data; 3862 char buf[12]; 3863 int bufsz = sizeof(buf); 3864 int pos = 0; 3865 static const char * const ss_force_name[] = { 3866 [RS_SS_FORCE_NONE] = "none", 3867 [RS_SS_FORCE_STBC] = "stbc", 3868 [RS_SS_FORCE_BFER] = "bfer", 3869 [RS_SS_FORCE_SISO] = "siso", 3870 }; 3871 3872 pos += scnprintf(buf+pos, bufsz-pos, "%s\n", 3873 ss_force_name[lq_sta->pers.ss_force]); 3874 return simple_read_from_buffer(user_buf, count, ppos, buf, pos); 3875 } 3876 3877 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf, 3878 size_t count, loff_t *ppos) 3879 { 3880 struct iwl_mvm *mvm = lq_sta->pers.drv; 3881 int ret = 0; 3882 3883 if (!strncmp("none", buf, 4)) { 3884 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 3885 } else if (!strncmp("siso", buf, 4)) { 3886 lq_sta->pers.ss_force = RS_SS_FORCE_SISO; 3887 } else if (!strncmp("stbc", buf, 4)) { 3888 if (lq_sta->stbc_capable) { 3889 lq_sta->pers.ss_force = RS_SS_FORCE_STBC; 3890 } else { 3891 IWL_ERR(mvm, 3892 "can't force STBC. peer doesn't support\n"); 3893 ret = -EINVAL; 3894 } 3895 } else if (!strncmp("bfer", buf, 4)) { 3896 if (lq_sta->bfer_capable) { 3897 lq_sta->pers.ss_force = RS_SS_FORCE_BFER; 3898 } else { 3899 IWL_ERR(mvm, 3900 "can't force BFER. peer doesn't support\n"); 3901 ret = -EINVAL; 3902 } 3903 } else { 3904 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n"); 3905 ret = -EINVAL; 3906 } 3907 return ret ?: count; 3908 } 3909 3910 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \ 3911 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta) 3912 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \ 3913 if (!debugfs_create_file(#name, mode, parent, lq_sta, \ 3914 &iwl_dbgfs_##name##_ops)) \ 3915 goto err; \ 3916 } while (0) 3917 3918 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32); 3919 3920 static void rs_add_debugfs(void *mvm, void *priv_sta, struct dentry *dir) 3921 { 3922 struct iwl_lq_sta *lq_sta = priv_sta; 3923 struct iwl_mvm_sta *mvmsta; 3924 3925 mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta); 3926 3927 if (!mvmsta->vif) 3928 return; 3929 3930 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir, 3931 lq_sta, &rs_sta_dbgfs_scale_table_ops); 3932 debugfs_create_file("rate_stats_table", S_IRUSR, dir, 3933 lq_sta, &rs_sta_dbgfs_stats_table_ops); 3934 debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir, 3935 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops); 3936 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir, 3937 &lq_sta->tx_agg_tid_en); 3938 debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir, 3939 &lq_sta->pers.dbg_fixed_txp_reduction); 3940 3941 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR); 3942 return; 3943 err: 3944 IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n"); 3945 } 3946 3947 static void rs_remove_debugfs(void *mvm, void *mvm_sta) 3948 { 3949 } 3950 #endif 3951 3952 /* 3953 * Initialization of rate scaling information is done by driver after 3954 * the station is added. Since mac80211 calls this function before a 3955 * station is added we ignore it. 3956 */ 3957 static void rs_rate_init_stub(void *mvm_r, 3958 struct ieee80211_supported_band *sband, 3959 struct cfg80211_chan_def *chandef, 3960 struct ieee80211_sta *sta, void *mvm_sta) 3961 { 3962 } 3963 3964 static const struct rate_control_ops rs_mvm_ops = { 3965 .name = RS_NAME, 3966 .tx_status = rs_mac80211_tx_status, 3967 .get_rate = rs_get_rate, 3968 .rate_init = rs_rate_init_stub, 3969 .alloc = rs_alloc, 3970 .free = rs_free, 3971 .alloc_sta = rs_alloc_sta, 3972 .free_sta = rs_free_sta, 3973 .rate_update = rs_rate_update, 3974 #ifdef CONFIG_MAC80211_DEBUGFS 3975 .add_sta_debugfs = rs_add_debugfs, 3976 .remove_sta_debugfs = rs_remove_debugfs, 3977 #endif 3978 }; 3979 3980 int iwl_mvm_rate_control_register(void) 3981 { 3982 return ieee80211_rate_control_register(&rs_mvm_ops); 3983 } 3984 3985 void iwl_mvm_rate_control_unregister(void) 3986 { 3987 ieee80211_rate_control_unregister(&rs_mvm_ops); 3988 } 3989 3990 /** 3991 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable 3992 * Tx protection, according to this request and previous requests, 3993 * and send the LQ command. 3994 * @mvmsta: The station 3995 * @enable: Enable Tx protection? 3996 */ 3997 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 3998 bool enable) 3999 { 4000 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq; 4001 4002 lockdep_assert_held(&mvm->mutex); 4003 4004 if (enable) { 4005 if (mvmsta->tx_protection == 0) 4006 lq->flags |= LQ_FLAG_USE_RTS_MSK; 4007 mvmsta->tx_protection++; 4008 } else { 4009 mvmsta->tx_protection--; 4010 if (mvmsta->tx_protection == 0) 4011 lq->flags &= ~LQ_FLAG_USE_RTS_MSK; 4012 } 4013 4014 return iwl_mvm_send_lq_cmd(mvm, lq, false); 4015 } 4016