1 /****************************************************************************** 2 * 3 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved. 4 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH 5 * Copyright(c) 2016 - 2017 Intel Deutschland GmbH 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of version 2 of the GNU General Public License as 9 * published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 14 * more details. 15 * 16 * You should have received a copy of the GNU General Public License along with 17 * this program; if not, write to the Free Software Foundation, Inc., 18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA 19 * 20 * The full GNU General Public License is included in this distribution in the 21 * file called LICENSE. 22 * 23 * Contact Information: 24 * Intel Linux Wireless <linuxwifi@intel.com> 25 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 26 * 27 *****************************************************************************/ 28 #include <linux/kernel.h> 29 #include <linux/skbuff.h> 30 #include <linux/slab.h> 31 #include <net/mac80211.h> 32 33 #include <linux/netdevice.h> 34 #include <linux/etherdevice.h> 35 #include <linux/delay.h> 36 37 #include <linux/workqueue.h> 38 #include "rs.h" 39 #include "fw-api.h" 40 #include "sta.h" 41 #include "iwl-op-mode.h" 42 #include "mvm.h" 43 #include "debugfs.h" 44 45 #define RS_NAME "iwl-mvm-rs" 46 47 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */ 48 49 /* Calculations of success ratio are done in fixed point where 12800 is 100%. 50 * Use this macro when dealing with thresholds consts set as a percentage 51 */ 52 #define RS_PERCENT(x) (128 * x) 53 54 static u8 rs_ht_to_legacy[] = { 55 [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX, 56 [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX, 57 [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX, 58 [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX, 59 [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX, 60 [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX, 61 [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX, 62 [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX, 63 [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX, 64 [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX, 65 }; 66 67 static const u8 ant_toggle_lookup[] = { 68 [ANT_NONE] = ANT_NONE, 69 [ANT_A] = ANT_B, 70 [ANT_B] = ANT_C, 71 [ANT_AB] = ANT_BC, 72 [ANT_C] = ANT_A, 73 [ANT_AC] = ANT_AB, 74 [ANT_BC] = ANT_AC, 75 [ANT_ABC] = ANT_ABC, 76 }; 77 78 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \ 79 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \ 80 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \ 81 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \ 82 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \ 83 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\ 84 IWL_RATE_##rp##M_INDEX, \ 85 IWL_RATE_##rn##M_INDEX } 86 87 #define IWL_DECLARE_MCS_RATE(s) \ 88 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \ 89 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \ 90 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \ 91 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \ 92 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \ 93 IWL_RATE_INVM_INDEX, \ 94 IWL_RATE_INVM_INDEX } 95 96 /* 97 * Parameter order: 98 * rate, ht rate, prev rate, next rate 99 * 100 * If there isn't a valid next or previous rate then INV is used which 101 * maps to IWL_RATE_INVALID 102 * 103 */ 104 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = { 105 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */ 106 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */ 107 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */ 108 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */ 109 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */ 110 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */ 111 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */ 112 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */ 113 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */ 114 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */ 115 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */ 116 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */ 117 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */ 118 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */ 119 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */ 120 }; 121 122 enum rs_action { 123 RS_ACTION_STAY = 0, 124 RS_ACTION_DOWNSCALE = -1, 125 RS_ACTION_UPSCALE = 1, 126 }; 127 128 enum rs_column_mode { 129 RS_INVALID = 0, 130 RS_LEGACY, 131 RS_SISO, 132 RS_MIMO2, 133 }; 134 135 #define MAX_NEXT_COLUMNS 7 136 #define MAX_COLUMN_CHECKS 3 137 138 struct rs_tx_column; 139 140 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm, 141 struct ieee80211_sta *sta, 142 struct rs_rate *rate, 143 const struct rs_tx_column *next_col); 144 145 struct rs_tx_column { 146 enum rs_column_mode mode; 147 u8 ant; 148 bool sgi; 149 enum rs_column next_columns[MAX_NEXT_COLUMNS]; 150 allow_column_func_t checks[MAX_COLUMN_CHECKS]; 151 }; 152 153 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 154 struct rs_rate *rate, 155 const struct rs_tx_column *next_col) 156 { 157 return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant); 158 } 159 160 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 161 struct rs_rate *rate, 162 const struct rs_tx_column *next_col) 163 { 164 if (!sta->ht_cap.ht_supported) 165 return false; 166 167 if (sta->smps_mode == IEEE80211_SMPS_STATIC) 168 return false; 169 170 if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2) 171 return false; 172 173 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 174 return false; 175 176 if (mvm->nvm_data->sku_cap_mimo_disabled) 177 return false; 178 179 return true; 180 } 181 182 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 183 struct rs_rate *rate, 184 const struct rs_tx_column *next_col) 185 { 186 if (!sta->ht_cap.ht_supported) 187 return false; 188 189 return true; 190 } 191 192 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 193 struct rs_rate *rate, 194 const struct rs_tx_column *next_col) 195 { 196 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 197 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; 198 199 if (is_ht20(rate) && (ht_cap->cap & 200 IEEE80211_HT_CAP_SGI_20)) 201 return true; 202 if (is_ht40(rate) && (ht_cap->cap & 203 IEEE80211_HT_CAP_SGI_40)) 204 return true; 205 if (is_ht80(rate) && (vht_cap->cap & 206 IEEE80211_VHT_CAP_SHORT_GI_80)) 207 return true; 208 if (is_ht160(rate) && (vht_cap->cap & 209 IEEE80211_VHT_CAP_SHORT_GI_160)) 210 return true; 211 212 return false; 213 } 214 215 static const struct rs_tx_column rs_tx_columns[] = { 216 [RS_COLUMN_LEGACY_ANT_A] = { 217 .mode = RS_LEGACY, 218 .ant = ANT_A, 219 .next_columns = { 220 RS_COLUMN_LEGACY_ANT_B, 221 RS_COLUMN_SISO_ANT_A, 222 RS_COLUMN_MIMO2, 223 RS_COLUMN_INVALID, 224 RS_COLUMN_INVALID, 225 RS_COLUMN_INVALID, 226 RS_COLUMN_INVALID, 227 }, 228 .checks = { 229 rs_ant_allow, 230 }, 231 }, 232 [RS_COLUMN_LEGACY_ANT_B] = { 233 .mode = RS_LEGACY, 234 .ant = ANT_B, 235 .next_columns = { 236 RS_COLUMN_LEGACY_ANT_A, 237 RS_COLUMN_SISO_ANT_B, 238 RS_COLUMN_MIMO2, 239 RS_COLUMN_INVALID, 240 RS_COLUMN_INVALID, 241 RS_COLUMN_INVALID, 242 RS_COLUMN_INVALID, 243 }, 244 .checks = { 245 rs_ant_allow, 246 }, 247 }, 248 [RS_COLUMN_SISO_ANT_A] = { 249 .mode = RS_SISO, 250 .ant = ANT_A, 251 .next_columns = { 252 RS_COLUMN_SISO_ANT_B, 253 RS_COLUMN_MIMO2, 254 RS_COLUMN_SISO_ANT_A_SGI, 255 RS_COLUMN_LEGACY_ANT_A, 256 RS_COLUMN_LEGACY_ANT_B, 257 RS_COLUMN_INVALID, 258 RS_COLUMN_INVALID, 259 }, 260 .checks = { 261 rs_siso_allow, 262 rs_ant_allow, 263 }, 264 }, 265 [RS_COLUMN_SISO_ANT_B] = { 266 .mode = RS_SISO, 267 .ant = ANT_B, 268 .next_columns = { 269 RS_COLUMN_SISO_ANT_A, 270 RS_COLUMN_MIMO2, 271 RS_COLUMN_SISO_ANT_B_SGI, 272 RS_COLUMN_LEGACY_ANT_A, 273 RS_COLUMN_LEGACY_ANT_B, 274 RS_COLUMN_INVALID, 275 RS_COLUMN_INVALID, 276 }, 277 .checks = { 278 rs_siso_allow, 279 rs_ant_allow, 280 }, 281 }, 282 [RS_COLUMN_SISO_ANT_A_SGI] = { 283 .mode = RS_SISO, 284 .ant = ANT_A, 285 .sgi = true, 286 .next_columns = { 287 RS_COLUMN_SISO_ANT_B_SGI, 288 RS_COLUMN_MIMO2_SGI, 289 RS_COLUMN_SISO_ANT_A, 290 RS_COLUMN_LEGACY_ANT_A, 291 RS_COLUMN_LEGACY_ANT_B, 292 RS_COLUMN_INVALID, 293 RS_COLUMN_INVALID, 294 }, 295 .checks = { 296 rs_siso_allow, 297 rs_ant_allow, 298 rs_sgi_allow, 299 }, 300 }, 301 [RS_COLUMN_SISO_ANT_B_SGI] = { 302 .mode = RS_SISO, 303 .ant = ANT_B, 304 .sgi = true, 305 .next_columns = { 306 RS_COLUMN_SISO_ANT_A_SGI, 307 RS_COLUMN_MIMO2_SGI, 308 RS_COLUMN_SISO_ANT_B, 309 RS_COLUMN_LEGACY_ANT_A, 310 RS_COLUMN_LEGACY_ANT_B, 311 RS_COLUMN_INVALID, 312 RS_COLUMN_INVALID, 313 }, 314 .checks = { 315 rs_siso_allow, 316 rs_ant_allow, 317 rs_sgi_allow, 318 }, 319 }, 320 [RS_COLUMN_MIMO2] = { 321 .mode = RS_MIMO2, 322 .ant = ANT_AB, 323 .next_columns = { 324 RS_COLUMN_SISO_ANT_A, 325 RS_COLUMN_MIMO2_SGI, 326 RS_COLUMN_LEGACY_ANT_A, 327 RS_COLUMN_LEGACY_ANT_B, 328 RS_COLUMN_INVALID, 329 RS_COLUMN_INVALID, 330 RS_COLUMN_INVALID, 331 }, 332 .checks = { 333 rs_mimo_allow, 334 }, 335 }, 336 [RS_COLUMN_MIMO2_SGI] = { 337 .mode = RS_MIMO2, 338 .ant = ANT_AB, 339 .sgi = true, 340 .next_columns = { 341 RS_COLUMN_SISO_ANT_A_SGI, 342 RS_COLUMN_MIMO2, 343 RS_COLUMN_LEGACY_ANT_A, 344 RS_COLUMN_LEGACY_ANT_B, 345 RS_COLUMN_INVALID, 346 RS_COLUMN_INVALID, 347 RS_COLUMN_INVALID, 348 }, 349 .checks = { 350 rs_mimo_allow, 351 rs_sgi_allow, 352 }, 353 }, 354 }; 355 356 static inline u8 rs_extract_rate(u32 rate_n_flags) 357 { 358 /* also works for HT because bits 7:6 are zero there */ 359 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK); 360 } 361 362 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags) 363 { 364 int idx = 0; 365 366 if (rate_n_flags & RATE_MCS_HT_MSK) { 367 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK; 368 idx += IWL_RATE_MCS_0_INDEX; 369 370 /* skip 9M not supported in HT*/ 371 if (idx >= IWL_RATE_9M_INDEX) 372 idx += 1; 373 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE)) 374 return idx; 375 } else if (rate_n_flags & RATE_MCS_VHT_MSK) { 376 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK; 377 idx += IWL_RATE_MCS_0_INDEX; 378 379 /* skip 9M not supported in VHT*/ 380 if (idx >= IWL_RATE_9M_INDEX) 381 idx++; 382 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE)) 383 return idx; 384 } else { 385 /* legacy rate format, search for match in table */ 386 387 u8 legacy_rate = rs_extract_rate(rate_n_flags); 388 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++) 389 if (iwl_rates[idx].plcp == legacy_rate) 390 return idx; 391 } 392 393 return IWL_RATE_INVALID; 394 } 395 396 static void rs_rate_scale_perform(struct iwl_mvm *mvm, 397 struct ieee80211_sta *sta, 398 struct iwl_lq_sta *lq_sta, 399 int tid, bool ndp); 400 static void rs_fill_lq_cmd(struct iwl_mvm *mvm, 401 struct ieee80211_sta *sta, 402 struct iwl_lq_sta *lq_sta, 403 const struct rs_rate *initial_rate); 404 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search); 405 406 /** 407 * The following tables contain the expected throughput metrics for all rates 408 * 409 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits 410 * 411 * where invalid entries are zeros. 412 * 413 * CCK rates are only valid in legacy table and will only be used in G 414 * (2.4 GHz) band. 415 */ 416 417 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = { 418 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0 419 }; 420 421 /* Expected TpT tables. 4 indexes: 422 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI 423 */ 424 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = { 425 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0}, 426 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0}, 427 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0}, 428 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0}, 429 }; 430 431 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = { 432 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275}, 433 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280}, 434 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173}, 435 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284}, 436 }; 437 438 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = { 439 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308}, 440 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312}, 441 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466}, 442 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691}, 443 }; 444 445 static const u16 expected_tpt_siso_160MHz[4][IWL_RATE_COUNT] = { 446 {0, 0, 0, 0, 191, 0, 244, 288, 298, 308, 313, 318, 323, 328, 330}, 447 {0, 0, 0, 0, 200, 0, 251, 293, 302, 312, 317, 322, 327, 332, 334}, 448 {0, 0, 0, 0, 439, 0, 875, 1307, 1736, 2584, 3419, 3831, 4240, 5049, 5581}, 449 {0, 0, 0, 0, 488, 0, 972, 1451, 1925, 2864, 3785, 4240, 4691, 5581, 6165}, 450 }; 451 452 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = { 453 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0}, 454 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0}, 455 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0}, 456 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0}, 457 }; 458 459 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = { 460 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300}, 461 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303}, 462 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053}, 463 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221}, 464 }; 465 466 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = { 467 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319}, 468 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320}, 469 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219}, 470 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545}, 471 }; 472 473 static const u16 expected_tpt_mimo2_160MHz[4][IWL_RATE_COUNT] = { 474 {0, 0, 0, 0, 240, 0, 278, 308, 313, 319, 322, 324, 328, 330, 334}, 475 {0, 0, 0, 0, 247, 0, 282, 310, 315, 320, 323, 325, 329, 332, 338}, 476 {0, 0, 0, 0, 875, 0, 1735, 2582, 3414, 5043, 6619, 7389, 8147, 9629, 10592}, 477 {0, 0, 0, 0, 971, 0, 1925, 2861, 3779, 5574, 7304, 8147, 8976, 10592, 11640}, 478 }; 479 480 /* mbps, mcs */ 481 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = { 482 { "1", "BPSK DSSS"}, 483 { "2", "QPSK DSSS"}, 484 {"5.5", "BPSK CCK"}, 485 { "11", "QPSK CCK"}, 486 { "6", "BPSK 1/2"}, 487 { "9", "BPSK 1/2"}, 488 { "12", "QPSK 1/2"}, 489 { "18", "QPSK 3/4"}, 490 { "24", "16QAM 1/2"}, 491 { "36", "16QAM 3/4"}, 492 { "48", "64QAM 2/3"}, 493 { "54", "64QAM 3/4"}, 494 { "60", "64QAM 5/6"}, 495 }; 496 497 #define MCS_INDEX_PER_STREAM (8) 498 499 static const char *rs_pretty_ant(u8 ant) 500 { 501 static const char * const ant_name[] = { 502 [ANT_NONE] = "None", 503 [ANT_A] = "A", 504 [ANT_B] = "B", 505 [ANT_AB] = "AB", 506 [ANT_C] = "C", 507 [ANT_AC] = "AC", 508 [ANT_BC] = "BC", 509 [ANT_ABC] = "ABC", 510 }; 511 512 if (ant > ANT_ABC) 513 return "UNKNOWN"; 514 515 return ant_name[ant]; 516 } 517 518 static const char *rs_pretty_lq_type(enum iwl_table_type type) 519 { 520 static const char * const lq_types[] = { 521 [LQ_NONE] = "NONE", 522 [LQ_LEGACY_A] = "LEGACY_A", 523 [LQ_LEGACY_G] = "LEGACY_G", 524 [LQ_HT_SISO] = "HT SISO", 525 [LQ_HT_MIMO2] = "HT MIMO", 526 [LQ_VHT_SISO] = "VHT SISO", 527 [LQ_VHT_MIMO2] = "VHT MIMO", 528 }; 529 530 if (type < LQ_NONE || type >= LQ_MAX) 531 return "UNKNOWN"; 532 533 return lq_types[type]; 534 } 535 536 static char *rs_pretty_rate(const struct rs_rate *rate) 537 { 538 static char buf[40]; 539 static const char * const legacy_rates[] = { 540 [IWL_RATE_1M_INDEX] = "1M", 541 [IWL_RATE_2M_INDEX] = "2M", 542 [IWL_RATE_5M_INDEX] = "5.5M", 543 [IWL_RATE_11M_INDEX] = "11M", 544 [IWL_RATE_6M_INDEX] = "6M", 545 [IWL_RATE_9M_INDEX] = "9M", 546 [IWL_RATE_12M_INDEX] = "12M", 547 [IWL_RATE_18M_INDEX] = "18M", 548 [IWL_RATE_24M_INDEX] = "24M", 549 [IWL_RATE_36M_INDEX] = "36M", 550 [IWL_RATE_48M_INDEX] = "48M", 551 [IWL_RATE_54M_INDEX] = "54M", 552 }; 553 static const char *const ht_vht_rates[] = { 554 [IWL_RATE_MCS_0_INDEX] = "MCS0", 555 [IWL_RATE_MCS_1_INDEX] = "MCS1", 556 [IWL_RATE_MCS_2_INDEX] = "MCS2", 557 [IWL_RATE_MCS_3_INDEX] = "MCS3", 558 [IWL_RATE_MCS_4_INDEX] = "MCS4", 559 [IWL_RATE_MCS_5_INDEX] = "MCS5", 560 [IWL_RATE_MCS_6_INDEX] = "MCS6", 561 [IWL_RATE_MCS_7_INDEX] = "MCS7", 562 [IWL_RATE_MCS_8_INDEX] = "MCS8", 563 [IWL_RATE_MCS_9_INDEX] = "MCS9", 564 }; 565 const char *rate_str; 566 567 if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX)) 568 rate_str = legacy_rates[rate->index]; 569 else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) && 570 (rate->index >= IWL_RATE_MCS_0_INDEX) && 571 (rate->index <= IWL_RATE_MCS_9_INDEX)) 572 rate_str = ht_vht_rates[rate->index]; 573 else 574 rate_str = "BAD_RATE"; 575 576 sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type), 577 rs_pretty_ant(rate->ant), rate_str); 578 return buf; 579 } 580 581 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate, 582 const char *prefix) 583 { 584 IWL_DEBUG_RATE(mvm, 585 "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n", 586 prefix, rs_pretty_rate(rate), rate->bw, 587 rate->sgi, rate->ldpc, rate->stbc); 588 } 589 590 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window) 591 { 592 window->data = 0; 593 window->success_counter = 0; 594 window->success_ratio = IWL_INVALID_VALUE; 595 window->counter = 0; 596 window->average_tpt = IWL_INVALID_VALUE; 597 } 598 599 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm, 600 struct iwl_scale_tbl_info *tbl) 601 { 602 int i; 603 604 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n"); 605 for (i = 0; i < IWL_RATE_COUNT; i++) 606 rs_rate_scale_clear_window(&tbl->win[i]); 607 608 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++) 609 rs_rate_scale_clear_window(&tbl->tpc_win[i]); 610 } 611 612 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type) 613 { 614 return (ant_type & valid_antenna) == ant_type; 615 } 616 617 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm, 618 struct iwl_lq_sta *lq_data, u8 tid, 619 struct ieee80211_sta *sta) 620 { 621 int ret = -EAGAIN; 622 623 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n", 624 sta->addr, tid); 625 ret = ieee80211_start_tx_ba_session(sta, tid, 5000); 626 if (ret == -EAGAIN) { 627 /* 628 * driver and mac80211 is out of sync 629 * this might be cause by reloading firmware 630 * stop the tx ba session here 631 */ 632 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n", 633 tid); 634 ieee80211_stop_tx_ba_session(sta, tid); 635 } 636 return ret; 637 } 638 639 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid, 640 struct iwl_lq_sta *lq_data, 641 struct ieee80211_sta *sta) 642 { 643 if (tid < IWL_MAX_TID_COUNT) 644 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta); 645 else 646 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n", 647 tid, IWL_MAX_TID_COUNT); 648 } 649 650 static inline int get_num_of_ant_from_rate(u32 rate_n_flags) 651 { 652 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) + 653 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) + 654 !!(rate_n_flags & RATE_MCS_ANT_C_MSK); 655 } 656 657 /* 658 * Static function to get the expected throughput from an iwl_scale_tbl_info 659 * that wraps a NULL pointer check 660 */ 661 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index) 662 { 663 if (tbl->expected_tpt) 664 return tbl->expected_tpt[rs_index]; 665 return 0; 666 } 667 668 /** 669 * rs_collect_tx_data - Update the success/failure sliding window 670 * 671 * We keep a sliding window of the last 62 packets transmitted 672 * at this rate. window->data contains the bitmask of successful 673 * packets. 674 */ 675 static int _rs_collect_tx_data(struct iwl_mvm *mvm, 676 struct iwl_scale_tbl_info *tbl, 677 int scale_index, int attempts, int successes, 678 struct iwl_rate_scale_data *window) 679 { 680 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1)); 681 s32 fail_count, tpt; 682 683 /* Get expected throughput */ 684 tpt = get_expected_tpt(tbl, scale_index); 685 686 /* 687 * Keep track of only the latest 62 tx frame attempts in this rate's 688 * history window; anything older isn't really relevant any more. 689 * If we have filled up the sliding window, drop the oldest attempt; 690 * if the oldest attempt (highest bit in bitmap) shows "success", 691 * subtract "1" from the success counter (this is the main reason 692 * we keep these bitmaps!). 693 */ 694 while (attempts > 0) { 695 if (window->counter >= IWL_RATE_MAX_WINDOW) { 696 /* remove earliest */ 697 window->counter = IWL_RATE_MAX_WINDOW - 1; 698 699 if (window->data & mask) { 700 window->data &= ~mask; 701 window->success_counter--; 702 } 703 } 704 705 /* Increment frames-attempted counter */ 706 window->counter++; 707 708 /* Shift bitmap by one frame to throw away oldest history */ 709 window->data <<= 1; 710 711 /* Mark the most recent #successes attempts as successful */ 712 if (successes > 0) { 713 window->success_counter++; 714 window->data |= 0x1; 715 successes--; 716 } 717 718 attempts--; 719 } 720 721 /* Calculate current success ratio, avoid divide-by-0! */ 722 if (window->counter > 0) 723 window->success_ratio = 128 * (100 * window->success_counter) 724 / window->counter; 725 else 726 window->success_ratio = IWL_INVALID_VALUE; 727 728 fail_count = window->counter - window->success_counter; 729 730 /* Calculate average throughput, if we have enough history. */ 731 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) || 732 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) 733 window->average_tpt = (window->success_ratio * tpt + 64) / 128; 734 else 735 window->average_tpt = IWL_INVALID_VALUE; 736 737 return 0; 738 } 739 740 static int rs_collect_tpc_data(struct iwl_mvm *mvm, 741 struct iwl_lq_sta *lq_sta, 742 struct iwl_scale_tbl_info *tbl, 743 int scale_index, int attempts, int successes, 744 u8 reduced_txp) 745 { 746 struct iwl_rate_scale_data *window = NULL; 747 748 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION)) 749 return -EINVAL; 750 751 window = &tbl->tpc_win[reduced_txp]; 752 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes, 753 window); 754 } 755 756 static int rs_collect_tlc_data(struct iwl_mvm *mvm, 757 struct iwl_lq_sta *lq_sta, 758 struct iwl_scale_tbl_info *tbl, 759 int scale_index, int attempts, int successes) 760 { 761 struct iwl_rate_scale_data *window = NULL; 762 763 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT) 764 return -EINVAL; 765 766 if (tbl->column != RS_COLUMN_INVALID) { 767 struct lq_sta_pers *pers = &lq_sta->pers; 768 769 pers->tx_stats[tbl->column][scale_index].total += attempts; 770 pers->tx_stats[tbl->column][scale_index].success += successes; 771 } 772 773 /* Select window for current tx bit rate */ 774 window = &(tbl->win[scale_index]); 775 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes, 776 window); 777 } 778 779 /* Convert rs_rate object into ucode rate bitmask */ 780 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm, 781 struct rs_rate *rate) 782 { 783 u32 ucode_rate = 0; 784 int index = rate->index; 785 786 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) & 787 RATE_MCS_ANT_ABC_MSK); 788 789 if (is_legacy(rate)) { 790 ucode_rate |= iwl_rates[index].plcp; 791 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE) 792 ucode_rate |= RATE_MCS_CCK_MSK; 793 return ucode_rate; 794 } 795 796 if (is_ht(rate)) { 797 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) { 798 IWL_ERR(mvm, "Invalid HT rate index %d\n", index); 799 index = IWL_LAST_HT_RATE; 800 } 801 ucode_rate |= RATE_MCS_HT_MSK; 802 803 if (is_ht_siso(rate)) 804 ucode_rate |= iwl_rates[index].plcp_ht_siso; 805 else if (is_ht_mimo2(rate)) 806 ucode_rate |= iwl_rates[index].plcp_ht_mimo2; 807 else 808 WARN_ON_ONCE(1); 809 } else if (is_vht(rate)) { 810 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) { 811 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index); 812 index = IWL_LAST_VHT_RATE; 813 } 814 ucode_rate |= RATE_MCS_VHT_MSK; 815 if (is_vht_siso(rate)) 816 ucode_rate |= iwl_rates[index].plcp_vht_siso; 817 else if (is_vht_mimo2(rate)) 818 ucode_rate |= iwl_rates[index].plcp_vht_mimo2; 819 else 820 WARN_ON_ONCE(1); 821 822 } else { 823 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type); 824 } 825 826 if (is_siso(rate) && rate->stbc) { 827 /* To enable STBC we need to set both a flag and ANT_AB */ 828 ucode_rate |= RATE_MCS_ANT_AB_MSK; 829 ucode_rate |= RATE_MCS_STBC_MSK; 830 } 831 832 ucode_rate |= rate->bw; 833 if (rate->sgi) 834 ucode_rate |= RATE_MCS_SGI_MSK; 835 if (rate->ldpc) 836 ucode_rate |= RATE_MCS_LDPC_MSK; 837 838 return ucode_rate; 839 } 840 841 /* Convert a ucode rate into an rs_rate object */ 842 static int rs_rate_from_ucode_rate(const u32 ucode_rate, 843 enum nl80211_band band, 844 struct rs_rate *rate) 845 { 846 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK; 847 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate); 848 u8 nss; 849 850 memset(rate, 0, sizeof(*rate)); 851 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate); 852 853 if (rate->index == IWL_RATE_INVALID) 854 return -EINVAL; 855 856 rate->ant = (ant_msk >> RATE_MCS_ANT_POS); 857 858 /* Legacy */ 859 if (!(ucode_rate & RATE_MCS_HT_MSK) && 860 !(ucode_rate & RATE_MCS_VHT_MSK)) { 861 if (num_of_ant == 1) { 862 if (band == NL80211_BAND_5GHZ) 863 rate->type = LQ_LEGACY_A; 864 else 865 rate->type = LQ_LEGACY_G; 866 } 867 868 return 0; 869 } 870 871 /* HT or VHT */ 872 if (ucode_rate & RATE_MCS_SGI_MSK) 873 rate->sgi = true; 874 if (ucode_rate & RATE_MCS_LDPC_MSK) 875 rate->ldpc = true; 876 if (ucode_rate & RATE_MCS_STBC_MSK) 877 rate->stbc = true; 878 if (ucode_rate & RATE_MCS_BF_MSK) 879 rate->bfer = true; 880 881 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK; 882 883 if (ucode_rate & RATE_MCS_HT_MSK) { 884 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >> 885 RATE_HT_MCS_NSS_POS) + 1; 886 887 if (nss == 1) { 888 rate->type = LQ_HT_SISO; 889 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 890 "stbc %d bfer %d", 891 rate->stbc, rate->bfer); 892 } else if (nss == 2) { 893 rate->type = LQ_HT_MIMO2; 894 WARN_ON_ONCE(num_of_ant != 2); 895 } else { 896 WARN_ON_ONCE(1); 897 } 898 } else if (ucode_rate & RATE_MCS_VHT_MSK) { 899 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >> 900 RATE_VHT_MCS_NSS_POS) + 1; 901 902 if (nss == 1) { 903 rate->type = LQ_VHT_SISO; 904 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 905 "stbc %d bfer %d", 906 rate->stbc, rate->bfer); 907 } else if (nss == 2) { 908 rate->type = LQ_VHT_MIMO2; 909 WARN_ON_ONCE(num_of_ant != 2); 910 } else { 911 WARN_ON_ONCE(1); 912 } 913 } 914 915 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 && 916 !is_vht(rate)); 917 918 return 0; 919 } 920 921 /* switch to another antenna/antennas and return 1 */ 922 /* if no other valid antenna found, return 0 */ 923 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate) 924 { 925 u8 new_ant_type; 926 927 if (!rate->ant || rate->ant > ANT_ABC) 928 return 0; 929 930 if (!rs_is_valid_ant(valid_ant, rate->ant)) 931 return 0; 932 933 new_ant_type = ant_toggle_lookup[rate->ant]; 934 935 while ((new_ant_type != rate->ant) && 936 !rs_is_valid_ant(valid_ant, new_ant_type)) 937 new_ant_type = ant_toggle_lookup[new_ant_type]; 938 939 if (new_ant_type == rate->ant) 940 return 0; 941 942 rate->ant = new_ant_type; 943 944 return 1; 945 } 946 947 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta, 948 struct rs_rate *rate) 949 { 950 if (is_legacy(rate)) 951 return lq_sta->active_legacy_rate; 952 else if (is_siso(rate)) 953 return lq_sta->active_siso_rate; 954 else if (is_mimo2(rate)) 955 return lq_sta->active_mimo2_rate; 956 957 WARN_ON_ONCE(1); 958 return 0; 959 } 960 961 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask, 962 int rate_type) 963 { 964 u8 high = IWL_RATE_INVALID; 965 u8 low = IWL_RATE_INVALID; 966 967 /* 802.11A or ht walks to the next literal adjacent rate in 968 * the rate table */ 969 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) { 970 int i; 971 u32 mask; 972 973 /* Find the previous rate that is in the rate mask */ 974 i = index - 1; 975 if (i >= 0) 976 mask = BIT(i); 977 for (; i >= 0; i--, mask >>= 1) { 978 if (rate_mask & mask) { 979 low = i; 980 break; 981 } 982 } 983 984 /* Find the next rate that is in the rate mask */ 985 i = index + 1; 986 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) { 987 if (rate_mask & mask) { 988 high = i; 989 break; 990 } 991 } 992 993 return (high << 8) | low; 994 } 995 996 low = index; 997 while (low != IWL_RATE_INVALID) { 998 low = iwl_rates[low].prev_rs; 999 if (low == IWL_RATE_INVALID) 1000 break; 1001 if (rate_mask & (1 << low)) 1002 break; 1003 } 1004 1005 high = index; 1006 while (high != IWL_RATE_INVALID) { 1007 high = iwl_rates[high].next_rs; 1008 if (high == IWL_RATE_INVALID) 1009 break; 1010 if (rate_mask & (1 << high)) 1011 break; 1012 } 1013 1014 return (high << 8) | low; 1015 } 1016 1017 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta, 1018 struct rs_rate *rate) 1019 { 1020 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate); 1021 } 1022 1023 /* Get the next supported lower rate in the current column. 1024 * Return true if bottom rate in the current column was reached 1025 */ 1026 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta, 1027 struct rs_rate *rate) 1028 { 1029 u8 low; 1030 u16 high_low; 1031 u16 rate_mask; 1032 struct iwl_mvm *mvm = lq_sta->pers.drv; 1033 1034 rate_mask = rs_get_supported_rates(lq_sta, rate); 1035 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask, 1036 rate->type); 1037 low = high_low & 0xff; 1038 1039 /* Bottom rate of column reached */ 1040 if (low == IWL_RATE_INVALID) 1041 return true; 1042 1043 rate->index = low; 1044 return false; 1045 } 1046 1047 /* Get the next rate to use following a column downgrade */ 1048 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta, 1049 struct rs_rate *rate) 1050 { 1051 struct iwl_mvm *mvm = lq_sta->pers.drv; 1052 1053 if (is_legacy(rate)) { 1054 /* No column to downgrade from Legacy */ 1055 return; 1056 } else if (is_siso(rate)) { 1057 /* Downgrade to Legacy if we were in SISO */ 1058 if (lq_sta->band == NL80211_BAND_5GHZ) 1059 rate->type = LQ_LEGACY_A; 1060 else 1061 rate->type = LQ_LEGACY_G; 1062 1063 rate->bw = RATE_MCS_CHAN_WIDTH_20; 1064 1065 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX || 1066 rate->index > IWL_RATE_MCS_9_INDEX); 1067 1068 rate->index = rs_ht_to_legacy[rate->index]; 1069 rate->ldpc = false; 1070 } else { 1071 /* Downgrade to SISO with same MCS if in MIMO */ 1072 rate->type = is_vht_mimo2(rate) ? 1073 LQ_VHT_SISO : LQ_HT_SISO; 1074 } 1075 1076 if (num_of_ant(rate->ant) > 1) 1077 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm)); 1078 1079 /* Relevant in both switching to SISO or Legacy */ 1080 rate->sgi = false; 1081 1082 if (!rs_rate_supported(lq_sta, rate)) 1083 rs_get_lower_rate_in_column(lq_sta, rate); 1084 } 1085 1086 /* Check if both rates share the same column */ 1087 static inline bool rs_rate_column_match(struct rs_rate *a, 1088 struct rs_rate *b) 1089 { 1090 bool ant_match; 1091 1092 if (a->stbc || a->bfer) 1093 ant_match = (b->ant == ANT_A || b->ant == ANT_B); 1094 else 1095 ant_match = (a->ant == b->ant); 1096 1097 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) 1098 && ant_match; 1099 } 1100 1101 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate) 1102 { 1103 if (is_legacy(rate)) { 1104 if (rate->ant == ANT_A) 1105 return RS_COLUMN_LEGACY_ANT_A; 1106 1107 if (rate->ant == ANT_B) 1108 return RS_COLUMN_LEGACY_ANT_B; 1109 1110 goto err; 1111 } 1112 1113 if (is_siso(rate)) { 1114 if (rate->ant == ANT_A || rate->stbc || rate->bfer) 1115 return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI : 1116 RS_COLUMN_SISO_ANT_A; 1117 1118 if (rate->ant == ANT_B) 1119 return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI : 1120 RS_COLUMN_SISO_ANT_B; 1121 1122 goto err; 1123 } 1124 1125 if (is_mimo(rate)) 1126 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2; 1127 1128 err: 1129 return RS_COLUMN_INVALID; 1130 } 1131 1132 static u8 rs_get_tid(struct ieee80211_hdr *hdr) 1133 { 1134 u8 tid = IWL_MAX_TID_COUNT; 1135 1136 if (ieee80211_is_data_qos(hdr->frame_control)) { 1137 u8 *qc = ieee80211_get_qos_ctl(hdr); 1138 tid = qc[0] & 0xf; 1139 } 1140 1141 if (unlikely(tid > IWL_MAX_TID_COUNT)) 1142 tid = IWL_MAX_TID_COUNT; 1143 1144 return tid; 1145 } 1146 1147 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1148 int tid, struct ieee80211_tx_info *info, bool ndp) 1149 { 1150 int legacy_success; 1151 int retries; 1152 int i; 1153 struct iwl_lq_cmd *table; 1154 u32 lq_hwrate; 1155 struct rs_rate lq_rate, tx_resp_rate; 1156 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl; 1157 u32 tlc_info = (uintptr_t)info->status.status_driver_data[0]; 1158 u8 reduced_txp = tlc_info & RS_DRV_DATA_TXP_MSK; 1159 u8 lq_color = RS_DRV_DATA_LQ_COLOR_GET(tlc_info); 1160 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1]; 1161 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 1162 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta; 1163 1164 /* Treat uninitialized rate scaling data same as non-existing. */ 1165 if (!lq_sta) { 1166 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n"); 1167 return; 1168 } else if (!lq_sta->pers.drv) { 1169 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n"); 1170 return; 1171 } 1172 1173 /* This packet was aggregated but doesn't carry status info */ 1174 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 1175 !(info->flags & IEEE80211_TX_STAT_AMPDU)) 1176 return; 1177 1178 rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate); 1179 1180 #ifdef CONFIG_MAC80211_DEBUGFS 1181 /* Disable last tx check if we are debugging with fixed rate but 1182 * update tx stats */ 1183 if (lq_sta->pers.dbg_fixed_rate) { 1184 int index = tx_resp_rate.index; 1185 enum rs_column column; 1186 int attempts, success; 1187 1188 column = rs_get_column_from_rate(&tx_resp_rate); 1189 if (WARN_ONCE(column == RS_COLUMN_INVALID, 1190 "Can't map rate 0x%x to column", 1191 tx_resp_hwrate)) 1192 return; 1193 1194 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 1195 attempts = info->status.ampdu_len; 1196 success = info->status.ampdu_ack_len; 1197 } else { 1198 attempts = info->status.rates[0].count; 1199 success = !!(info->flags & IEEE80211_TX_STAT_ACK); 1200 } 1201 1202 lq_sta->pers.tx_stats[column][index].total += attempts; 1203 lq_sta->pers.tx_stats[column][index].success += success; 1204 1205 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n", 1206 tx_resp_hwrate, success, attempts); 1207 return; 1208 } 1209 #endif 1210 1211 if (time_after(jiffies, 1212 (unsigned long)(lq_sta->last_tx + 1213 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) { 1214 int t; 1215 1216 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n"); 1217 for (t = 0; t < IWL_MAX_TID_COUNT; t++) 1218 ieee80211_stop_tx_ba_session(sta, t); 1219 1220 iwl_mvm_rs_rate_init(mvm, sta, info->band, false); 1221 return; 1222 } 1223 lq_sta->last_tx = jiffies; 1224 1225 /* Ignore this Tx frame response if its initial rate doesn't match 1226 * that of latest Link Quality command. There may be stragglers 1227 * from a previous Link Quality command, but we're no longer interested 1228 * in those; they're either from the "active" mode while we're trying 1229 * to check "search" mode, or a prior "search" mode after we've moved 1230 * to a new "search" mode (which might become the new "active" mode). 1231 */ 1232 table = &lq_sta->lq; 1233 lq_hwrate = le32_to_cpu(table->rs_table[0]); 1234 rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate); 1235 1236 /* Here we actually compare this rate to the latest LQ command */ 1237 if (lq_color != LQ_FLAG_COLOR_GET(table->flags)) { 1238 IWL_DEBUG_RATE(mvm, 1239 "tx resp color 0x%x does not match 0x%x\n", 1240 lq_color, LQ_FLAG_COLOR_GET(table->flags)); 1241 1242 /* 1243 * Since rates mis-match, the last LQ command may have failed. 1244 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with 1245 * ... driver. 1246 */ 1247 lq_sta->missed_rate_counter++; 1248 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) { 1249 lq_sta->missed_rate_counter = 0; 1250 IWL_DEBUG_RATE(mvm, 1251 "Too many rates mismatch. Send sync LQ. rs_state %d\n", 1252 lq_sta->rs_state); 1253 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false); 1254 } 1255 /* Regardless, ignore this status info for outdated rate */ 1256 return; 1257 } else 1258 /* Rate did match, so reset the missed_rate_counter */ 1259 lq_sta->missed_rate_counter = 0; 1260 1261 if (!lq_sta->search_better_tbl) { 1262 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1263 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1264 } else { 1265 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1266 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1267 } 1268 1269 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) { 1270 IWL_DEBUG_RATE(mvm, 1271 "Neither active nor search matches tx rate\n"); 1272 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1273 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE"); 1274 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1275 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH"); 1276 rs_dump_rate(mvm, &lq_rate, "ACTUAL"); 1277 1278 /* 1279 * no matching table found, let's by-pass the data collection 1280 * and continue to perform rate scale to find the rate table 1281 */ 1282 rs_stay_in_table(lq_sta, true); 1283 goto done; 1284 } 1285 1286 /* 1287 * Updating the frame history depends on whether packets were 1288 * aggregated. 1289 * 1290 * For aggregation, all packets were transmitted at the same rate, the 1291 * first index into rate scale table. 1292 */ 1293 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 1294 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, lq_rate.index, 1295 info->status.ampdu_len, 1296 info->status.ampdu_ack_len, 1297 reduced_txp); 1298 1299 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat 1300 * it as a single frame loss as we don't want the success ratio 1301 * to dip too quickly because a BA wasn't received. 1302 * For TPC, there's no need for this optimisation since we want 1303 * to recover very quickly from a bad power reduction and, 1304 * therefore we'd like the success ratio to get an immediate hit 1305 * when failing to get a BA, so we'd switch back to a lower or 1306 * zero power reduction. When FW transmits agg with a rate 1307 * different from the initial rate, it will not use reduced txp 1308 * and will send BA notification twice (one empty with reduced 1309 * txp equal to the value from LQ and one with reduced txp 0). 1310 * We need to update counters for each txp level accordingly. 1311 */ 1312 if (info->status.ampdu_ack_len == 0) 1313 info->status.ampdu_len = 1; 1314 1315 rs_collect_tlc_data(mvm, lq_sta, curr_tbl, lq_rate.index, 1316 info->status.ampdu_len, 1317 info->status.ampdu_ack_len); 1318 1319 /* Update success/fail counts if not searching for new mode */ 1320 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1321 lq_sta->total_success += info->status.ampdu_ack_len; 1322 lq_sta->total_failed += (info->status.ampdu_len - 1323 info->status.ampdu_ack_len); 1324 } 1325 } else { 1326 /* For legacy, update frame history with for each Tx retry. */ 1327 retries = info->status.rates[0].count - 1; 1328 /* HW doesn't send more than 15 retries */ 1329 retries = min(retries, 15); 1330 1331 /* The last transmission may have been successful */ 1332 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK); 1333 /* Collect data for each rate used during failed TX attempts */ 1334 for (i = 0; i <= retries; ++i) { 1335 lq_hwrate = le32_to_cpu(table->rs_table[i]); 1336 rs_rate_from_ucode_rate(lq_hwrate, info->band, 1337 &lq_rate); 1338 /* 1339 * Only collect stats if retried rate is in the same RS 1340 * table as active/search. 1341 */ 1342 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate)) 1343 tmp_tbl = curr_tbl; 1344 else if (rs_rate_column_match(&lq_rate, 1345 &other_tbl->rate)) 1346 tmp_tbl = other_tbl; 1347 else 1348 continue; 1349 1350 rs_collect_tpc_data(mvm, lq_sta, tmp_tbl, 1351 lq_rate.index, 1, 1352 i < retries ? 0 : legacy_success, 1353 reduced_txp); 1354 rs_collect_tlc_data(mvm, lq_sta, tmp_tbl, 1355 lq_rate.index, 1, 1356 i < retries ? 0 : legacy_success); 1357 } 1358 1359 /* Update success/fail counts if not searching for new mode */ 1360 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1361 lq_sta->total_success += legacy_success; 1362 lq_sta->total_failed += retries + (1 - legacy_success); 1363 } 1364 } 1365 /* The last TX rate is cached in lq_sta; it's set in if/else above */ 1366 lq_sta->last_rate_n_flags = lq_hwrate; 1367 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp); 1368 done: 1369 /* See if there's a better rate or modulation mode to try. */ 1370 if (sta->supp_rates[info->band]) 1371 rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp); 1372 } 1373 1374 /* 1375 * mac80211 sends us Tx status 1376 */ 1377 static void rs_mac80211_tx_status(void *mvm_r, 1378 struct ieee80211_supported_band *sband, 1379 struct ieee80211_sta *sta, void *priv_sta, 1380 struct sk_buff *skb) 1381 { 1382 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1383 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r; 1384 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 1385 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1386 1387 if (!iwl_mvm_sta_from_mac80211(sta)->vif) 1388 return; 1389 1390 if (!ieee80211_is_data(hdr->frame_control) || 1391 info->flags & IEEE80211_TX_CTL_NO_ACK) 1392 return; 1393 1394 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info, 1395 ieee80211_is_qos_nullfunc(hdr->frame_control)); 1396 } 1397 1398 /* 1399 * Begin a period of staying with a selected modulation mode. 1400 * Set "stay_in_tbl" flag to prevent any mode switches. 1401 * Set frame tx success limits according to legacy vs. high-throughput, 1402 * and reset overall (spanning all rates) tx success history statistics. 1403 * These control how long we stay using same modulation mode before 1404 * searching for a new mode. 1405 */ 1406 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy, 1407 struct iwl_lq_sta *lq_sta) 1408 { 1409 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n"); 1410 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN; 1411 if (is_legacy) { 1412 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT; 1413 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT; 1414 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT; 1415 } else { 1416 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT; 1417 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT; 1418 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT; 1419 } 1420 lq_sta->table_count = 0; 1421 lq_sta->total_failed = 0; 1422 lq_sta->total_success = 0; 1423 lq_sta->flush_timer = jiffies; 1424 lq_sta->visited_columns = 0; 1425 } 1426 1427 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask) 1428 { 1429 if (rate_mask) 1430 return find_last_bit(&rate_mask, BITS_PER_LONG); 1431 return IWL_RATE_INVALID; 1432 } 1433 1434 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta, 1435 const struct rs_tx_column *column) 1436 { 1437 switch (column->mode) { 1438 case RS_LEGACY: 1439 return lq_sta->max_legacy_rate_idx; 1440 case RS_SISO: 1441 return lq_sta->max_siso_rate_idx; 1442 case RS_MIMO2: 1443 return lq_sta->max_mimo2_rate_idx; 1444 default: 1445 WARN_ON_ONCE(1); 1446 } 1447 1448 return lq_sta->max_legacy_rate_idx; 1449 } 1450 1451 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1452 const struct rs_tx_column *column, 1453 u32 bw) 1454 { 1455 /* Used to choose among HT tables */ 1456 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT]; 1457 1458 if (WARN_ON_ONCE(column->mode != RS_LEGACY && 1459 column->mode != RS_SISO && 1460 column->mode != RS_MIMO2)) 1461 return expected_tpt_legacy; 1462 1463 /* Legacy rates have only one table */ 1464 if (column->mode == RS_LEGACY) 1465 return expected_tpt_legacy; 1466 1467 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1468 /* Choose among many HT tables depending on number of streams 1469 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation 1470 * status */ 1471 if (column->mode == RS_SISO) { 1472 switch (bw) { 1473 case RATE_MCS_CHAN_WIDTH_20: 1474 ht_tbl_pointer = expected_tpt_siso_20MHz; 1475 break; 1476 case RATE_MCS_CHAN_WIDTH_40: 1477 ht_tbl_pointer = expected_tpt_siso_40MHz; 1478 break; 1479 case RATE_MCS_CHAN_WIDTH_80: 1480 ht_tbl_pointer = expected_tpt_siso_80MHz; 1481 break; 1482 case RATE_MCS_CHAN_WIDTH_160: 1483 ht_tbl_pointer = expected_tpt_siso_160MHz; 1484 break; 1485 default: 1486 WARN_ON_ONCE(1); 1487 } 1488 } else if (column->mode == RS_MIMO2) { 1489 switch (bw) { 1490 case RATE_MCS_CHAN_WIDTH_20: 1491 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1492 break; 1493 case RATE_MCS_CHAN_WIDTH_40: 1494 ht_tbl_pointer = expected_tpt_mimo2_40MHz; 1495 break; 1496 case RATE_MCS_CHAN_WIDTH_80: 1497 ht_tbl_pointer = expected_tpt_mimo2_80MHz; 1498 break; 1499 case RATE_MCS_CHAN_WIDTH_160: 1500 ht_tbl_pointer = expected_tpt_mimo2_160MHz; 1501 break; 1502 default: 1503 WARN_ON_ONCE(1); 1504 } 1505 } else { 1506 WARN_ON_ONCE(1); 1507 } 1508 1509 if (!column->sgi && !lq_sta->is_agg) /* Normal */ 1510 return ht_tbl_pointer[0]; 1511 else if (column->sgi && !lq_sta->is_agg) /* SGI */ 1512 return ht_tbl_pointer[1]; 1513 else if (!column->sgi && lq_sta->is_agg) /* AGG */ 1514 return ht_tbl_pointer[2]; 1515 else /* AGG+SGI */ 1516 return ht_tbl_pointer[3]; 1517 } 1518 1519 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1520 struct iwl_scale_tbl_info *tbl) 1521 { 1522 struct rs_rate *rate = &tbl->rate; 1523 const struct rs_tx_column *column = &rs_tx_columns[tbl->column]; 1524 1525 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw); 1526 } 1527 1528 static s32 rs_get_best_rate(struct iwl_mvm *mvm, 1529 struct iwl_lq_sta *lq_sta, 1530 struct iwl_scale_tbl_info *tbl, /* "search" */ 1531 unsigned long rate_mask, s8 index) 1532 { 1533 struct iwl_scale_tbl_info *active_tbl = 1534 &(lq_sta->lq_info[lq_sta->active_tbl]); 1535 s32 success_ratio = active_tbl->win[index].success_ratio; 1536 u16 expected_current_tpt = active_tbl->expected_tpt[index]; 1537 const u16 *tpt_tbl = tbl->expected_tpt; 1538 u16 high_low; 1539 u32 target_tpt; 1540 int rate_idx; 1541 1542 if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { 1543 target_tpt = 100 * expected_current_tpt; 1544 IWL_DEBUG_RATE(mvm, 1545 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n", 1546 success_ratio, target_tpt); 1547 } else { 1548 target_tpt = lq_sta->last_tpt; 1549 IWL_DEBUG_RATE(mvm, 1550 "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n", 1551 success_ratio, target_tpt); 1552 } 1553 1554 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG); 1555 1556 while (rate_idx != IWL_RATE_INVALID) { 1557 if (target_tpt < (100 * tpt_tbl[rate_idx])) 1558 break; 1559 1560 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask, 1561 tbl->rate.type); 1562 1563 rate_idx = (high_low >> 8) & 0xff; 1564 } 1565 1566 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n", 1567 rate_idx, target_tpt, 1568 rate_idx != IWL_RATE_INVALID ? 1569 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE); 1570 1571 return rate_idx; 1572 } 1573 1574 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta) 1575 { 1576 switch (sta->bandwidth) { 1577 case IEEE80211_STA_RX_BW_160: 1578 return RATE_MCS_CHAN_WIDTH_160; 1579 case IEEE80211_STA_RX_BW_80: 1580 return RATE_MCS_CHAN_WIDTH_80; 1581 case IEEE80211_STA_RX_BW_40: 1582 return RATE_MCS_CHAN_WIDTH_40; 1583 case IEEE80211_STA_RX_BW_20: 1584 default: 1585 return RATE_MCS_CHAN_WIDTH_20; 1586 } 1587 } 1588 1589 /* 1590 * Check whether we should continue using same modulation mode, or 1591 * begin search for a new mode, based on: 1592 * 1) # tx successes or failures while using this mode 1593 * 2) # times calling this function 1594 * 3) elapsed time in this mode (not used, for now) 1595 */ 1596 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search) 1597 { 1598 struct iwl_scale_tbl_info *tbl; 1599 int active_tbl; 1600 int flush_interval_passed = 0; 1601 struct iwl_mvm *mvm; 1602 1603 mvm = lq_sta->pers.drv; 1604 active_tbl = lq_sta->active_tbl; 1605 1606 tbl = &(lq_sta->lq_info[active_tbl]); 1607 1608 /* If we've been disallowing search, see if we should now allow it */ 1609 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1610 /* Elapsed time using current modulation mode */ 1611 if (lq_sta->flush_timer) 1612 flush_interval_passed = 1613 time_after(jiffies, 1614 (unsigned long)(lq_sta->flush_timer + 1615 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ))); 1616 1617 /* 1618 * Check if we should allow search for new modulation mode. 1619 * If many frames have failed or succeeded, or we've used 1620 * this same modulation for a long time, allow search, and 1621 * reset history stats that keep track of whether we should 1622 * allow a new search. Also (below) reset all bitmaps and 1623 * stats in active history. 1624 */ 1625 if (force_search || 1626 (lq_sta->total_failed > lq_sta->max_failure_limit) || 1627 (lq_sta->total_success > lq_sta->max_success_limit) || 1628 ((!lq_sta->search_better_tbl) && 1629 (lq_sta->flush_timer) && (flush_interval_passed))) { 1630 IWL_DEBUG_RATE(mvm, 1631 "LQ: stay is expired %d %d %d\n", 1632 lq_sta->total_failed, 1633 lq_sta->total_success, 1634 flush_interval_passed); 1635 1636 /* Allow search for new mode */ 1637 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED; 1638 IWL_DEBUG_RATE(mvm, 1639 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n"); 1640 lq_sta->total_failed = 0; 1641 lq_sta->total_success = 0; 1642 lq_sta->flush_timer = 0; 1643 /* mark the current column as visited */ 1644 lq_sta->visited_columns = BIT(tbl->column); 1645 /* 1646 * Else if we've used this modulation mode enough repetitions 1647 * (regardless of elapsed time or success/failure), reset 1648 * history bitmaps and rate-specific stats for all rates in 1649 * active table. 1650 */ 1651 } else { 1652 lq_sta->table_count++; 1653 if (lq_sta->table_count >= 1654 lq_sta->table_count_limit) { 1655 lq_sta->table_count = 0; 1656 1657 IWL_DEBUG_RATE(mvm, 1658 "LQ: stay in table clear win\n"); 1659 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1660 } 1661 } 1662 1663 /* If transitioning to allow "search", reset all history 1664 * bitmaps and stats in active table (this will become the new 1665 * "search" table). */ 1666 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) { 1667 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1668 } 1669 } 1670 } 1671 1672 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1673 struct iwl_scale_tbl_info *tbl, 1674 enum rs_action scale_action) 1675 { 1676 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta); 1677 1678 if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) || 1679 tbl->rate.index < IWL_RATE_MCS_5_INDEX || 1680 scale_action == RS_ACTION_DOWNSCALE) 1681 sta_priv->tlc_amsdu = false; 1682 else 1683 sta_priv->tlc_amsdu = true; 1684 } 1685 1686 /* 1687 * setup rate table in uCode 1688 */ 1689 static void rs_update_rate_tbl(struct iwl_mvm *mvm, 1690 struct ieee80211_sta *sta, 1691 struct iwl_lq_sta *lq_sta, 1692 struct iwl_scale_tbl_info *tbl) 1693 { 1694 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate); 1695 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false); 1696 } 1697 1698 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm, 1699 struct ieee80211_sta *sta, 1700 struct iwl_lq_sta *lq_sta, 1701 struct iwl_scale_tbl_info *tbl, 1702 enum rs_action scale_action) 1703 { 1704 if (sta->bandwidth != IEEE80211_STA_RX_BW_80) 1705 return false; 1706 1707 if (!is_vht_siso(&tbl->rate)) 1708 return false; 1709 1710 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) && 1711 (tbl->rate.index == IWL_RATE_MCS_0_INDEX) && 1712 (scale_action == RS_ACTION_DOWNSCALE)) { 1713 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20; 1714 tbl->rate.index = IWL_RATE_MCS_4_INDEX; 1715 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n"); 1716 goto tweaked; 1717 } 1718 1719 /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is 1720 * sustainable, i.e. we're past the test window. We can't go back 1721 * if MCS5 is just tested as this will happen always after switching 1722 * to 20Mhz MCS4 because the rate stats are cleared. 1723 */ 1724 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) && 1725 (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) && 1726 (scale_action == RS_ACTION_STAY)) || 1727 ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) && 1728 (scale_action == RS_ACTION_UPSCALE)))) { 1729 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80; 1730 tbl->rate.index = IWL_RATE_MCS_1_INDEX; 1731 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n"); 1732 goto tweaked; 1733 } 1734 1735 return false; 1736 1737 tweaked: 1738 rs_set_expected_tpt_table(lq_sta, tbl); 1739 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1740 return true; 1741 } 1742 1743 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm, 1744 struct iwl_lq_sta *lq_sta, 1745 struct ieee80211_sta *sta, 1746 struct iwl_scale_tbl_info *tbl) 1747 { 1748 int i, j, max_rate; 1749 enum rs_column next_col_id; 1750 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column]; 1751 const struct rs_tx_column *next_col; 1752 allow_column_func_t allow_func; 1753 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm); 1754 const u16 *expected_tpt_tbl; 1755 u16 tpt, max_expected_tpt; 1756 1757 for (i = 0; i < MAX_NEXT_COLUMNS; i++) { 1758 next_col_id = curr_col->next_columns[i]; 1759 1760 if (next_col_id == RS_COLUMN_INVALID) 1761 continue; 1762 1763 if (lq_sta->visited_columns & BIT(next_col_id)) { 1764 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n", 1765 next_col_id); 1766 continue; 1767 } 1768 1769 next_col = &rs_tx_columns[next_col_id]; 1770 1771 if (!rs_is_valid_ant(valid_ants, next_col->ant)) { 1772 IWL_DEBUG_RATE(mvm, 1773 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n", 1774 next_col_id, valid_ants, next_col->ant); 1775 continue; 1776 } 1777 1778 for (j = 0; j < MAX_COLUMN_CHECKS; j++) { 1779 allow_func = next_col->checks[j]; 1780 if (allow_func && !allow_func(mvm, sta, &tbl->rate, 1781 next_col)) 1782 break; 1783 } 1784 1785 if (j != MAX_COLUMN_CHECKS) { 1786 IWL_DEBUG_RATE(mvm, 1787 "Skip column %d: not allowed (check %d failed)\n", 1788 next_col_id, j); 1789 1790 continue; 1791 } 1792 1793 tpt = lq_sta->last_tpt / 100; 1794 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col, 1795 rs_bw_from_sta_bw(sta)); 1796 if (WARN_ON_ONCE(!expected_tpt_tbl)) 1797 continue; 1798 1799 max_rate = rs_get_max_allowed_rate(lq_sta, next_col); 1800 if (max_rate == IWL_RATE_INVALID) { 1801 IWL_DEBUG_RATE(mvm, 1802 "Skip column %d: no rate is allowed in this column\n", 1803 next_col_id); 1804 continue; 1805 } 1806 1807 max_expected_tpt = expected_tpt_tbl[max_rate]; 1808 if (tpt >= max_expected_tpt) { 1809 IWL_DEBUG_RATE(mvm, 1810 "Skip column %d: can't beat current TPT. Max expected %d current %d\n", 1811 next_col_id, max_expected_tpt, tpt); 1812 continue; 1813 } 1814 1815 IWL_DEBUG_RATE(mvm, 1816 "Found potential column %d. Max expected %d current %d\n", 1817 next_col_id, max_expected_tpt, tpt); 1818 break; 1819 } 1820 1821 if (i == MAX_NEXT_COLUMNS) 1822 return RS_COLUMN_INVALID; 1823 1824 return next_col_id; 1825 } 1826 1827 static int rs_switch_to_column(struct iwl_mvm *mvm, 1828 struct iwl_lq_sta *lq_sta, 1829 struct ieee80211_sta *sta, 1830 enum rs_column col_id) 1831 { 1832 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1833 struct iwl_scale_tbl_info *search_tbl = 1834 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 1835 struct rs_rate *rate = &search_tbl->rate; 1836 const struct rs_tx_column *column = &rs_tx_columns[col_id]; 1837 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column]; 1838 u32 sz = (sizeof(struct iwl_scale_tbl_info) - 1839 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); 1840 unsigned long rate_mask = 0; 1841 u32 rate_idx = 0; 1842 1843 memcpy(search_tbl, tbl, sz); 1844 1845 rate->sgi = column->sgi; 1846 rate->ant = column->ant; 1847 1848 if (column->mode == RS_LEGACY) { 1849 if (lq_sta->band == NL80211_BAND_5GHZ) 1850 rate->type = LQ_LEGACY_A; 1851 else 1852 rate->type = LQ_LEGACY_G; 1853 1854 rate->bw = RATE_MCS_CHAN_WIDTH_20; 1855 rate->ldpc = false; 1856 rate_mask = lq_sta->active_legacy_rate; 1857 } else if (column->mode == RS_SISO) { 1858 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; 1859 rate_mask = lq_sta->active_siso_rate; 1860 } else if (column->mode == RS_MIMO2) { 1861 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; 1862 rate_mask = lq_sta->active_mimo2_rate; 1863 } else { 1864 WARN_ONCE(1, "Bad column mode"); 1865 } 1866 1867 if (column->mode != RS_LEGACY) { 1868 rate->bw = rs_bw_from_sta_bw(sta); 1869 rate->ldpc = lq_sta->ldpc; 1870 } 1871 1872 search_tbl->column = col_id; 1873 rs_set_expected_tpt_table(lq_sta, search_tbl); 1874 1875 lq_sta->visited_columns |= BIT(col_id); 1876 1877 /* Get the best matching rate if we're changing modes. e.g. 1878 * SISO->MIMO, LEGACY->SISO, MIMO->SISO 1879 */ 1880 if (curr_column->mode != column->mode) { 1881 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl, 1882 rate_mask, rate->index); 1883 1884 if ((rate_idx == IWL_RATE_INVALID) || 1885 !(BIT(rate_idx) & rate_mask)) { 1886 IWL_DEBUG_RATE(mvm, 1887 "can not switch with index %d" 1888 " rate mask %lx\n", 1889 rate_idx, rate_mask); 1890 1891 goto err; 1892 } 1893 1894 rate->index = rate_idx; 1895 } 1896 1897 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n", 1898 col_id, rate->index); 1899 1900 return 0; 1901 1902 err: 1903 rate->type = LQ_NONE; 1904 return -1; 1905 } 1906 1907 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm, 1908 struct iwl_scale_tbl_info *tbl, 1909 s32 sr, int low, int high, 1910 int current_tpt, 1911 int low_tpt, int high_tpt) 1912 { 1913 enum rs_action action = RS_ACTION_STAY; 1914 1915 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) || 1916 (current_tpt == 0)) { 1917 IWL_DEBUG_RATE(mvm, 1918 "Decrease rate because of low SR\n"); 1919 return RS_ACTION_DOWNSCALE; 1920 } 1921 1922 if ((low_tpt == IWL_INVALID_VALUE) && 1923 (high_tpt == IWL_INVALID_VALUE) && 1924 (high != IWL_RATE_INVALID)) { 1925 IWL_DEBUG_RATE(mvm, 1926 "No data about high/low rates. Increase rate\n"); 1927 return RS_ACTION_UPSCALE; 1928 } 1929 1930 if ((high_tpt == IWL_INVALID_VALUE) && 1931 (high != IWL_RATE_INVALID) && 1932 (low_tpt != IWL_INVALID_VALUE) && 1933 (low_tpt < current_tpt)) { 1934 IWL_DEBUG_RATE(mvm, 1935 "No data about high rate and low rate is worse. Increase rate\n"); 1936 return RS_ACTION_UPSCALE; 1937 } 1938 1939 if ((high_tpt != IWL_INVALID_VALUE) && 1940 (high_tpt > current_tpt)) { 1941 IWL_DEBUG_RATE(mvm, 1942 "Higher rate is better. Increate rate\n"); 1943 return RS_ACTION_UPSCALE; 1944 } 1945 1946 if ((low_tpt != IWL_INVALID_VALUE) && 1947 (high_tpt != IWL_INVALID_VALUE) && 1948 (low_tpt < current_tpt) && 1949 (high_tpt < current_tpt)) { 1950 IWL_DEBUG_RATE(mvm, 1951 "Both high and low are worse. Maintain rate\n"); 1952 return RS_ACTION_STAY; 1953 } 1954 1955 if ((low_tpt != IWL_INVALID_VALUE) && 1956 (low_tpt > current_tpt)) { 1957 IWL_DEBUG_RATE(mvm, 1958 "Lower rate is better\n"); 1959 action = RS_ACTION_DOWNSCALE; 1960 goto out; 1961 } 1962 1963 if ((low_tpt == IWL_INVALID_VALUE) && 1964 (low != IWL_RATE_INVALID)) { 1965 IWL_DEBUG_RATE(mvm, 1966 "No data about lower rate\n"); 1967 action = RS_ACTION_DOWNSCALE; 1968 goto out; 1969 } 1970 1971 IWL_DEBUG_RATE(mvm, "Maintain rate\n"); 1972 1973 out: 1974 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) { 1975 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { 1976 IWL_DEBUG_RATE(mvm, 1977 "SR is above NO DECREASE. Avoid downscale\n"); 1978 action = RS_ACTION_STAY; 1979 } else if (current_tpt > (100 * tbl->expected_tpt[low])) { 1980 IWL_DEBUG_RATE(mvm, 1981 "Current TPT is higher than max expected in low rate. Avoid downscale\n"); 1982 action = RS_ACTION_STAY; 1983 } else { 1984 IWL_DEBUG_RATE(mvm, "Decrease rate\n"); 1985 } 1986 } 1987 1988 return action; 1989 } 1990 1991 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1992 struct iwl_lq_sta *lq_sta) 1993 { 1994 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which 1995 * supports STBC of at least 1*SS 1996 */ 1997 if (!lq_sta->stbc_capable) 1998 return false; 1999 2000 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 2001 return false; 2002 2003 return true; 2004 } 2005 2006 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index, 2007 int *weaker, int *stronger) 2008 { 2009 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP; 2010 if (*weaker > TPC_MAX_REDUCTION) 2011 *weaker = TPC_INVALID; 2012 2013 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP; 2014 if (*stronger < 0) 2015 *stronger = TPC_INVALID; 2016 } 2017 2018 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif, 2019 struct rs_rate *rate, enum nl80211_band band) 2020 { 2021 int index = rate->index; 2022 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM); 2023 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION && 2024 !vif->bss_conf.ps); 2025 2026 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n", 2027 cam, sta_ps_disabled); 2028 /* 2029 * allow tpc only if power management is enabled, or bt coex 2030 * activity grade allows it and we are on 2.4Ghz. 2031 */ 2032 if ((cam || sta_ps_disabled) && 2033 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band)) 2034 return false; 2035 2036 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type); 2037 if (is_legacy(rate)) 2038 return index == IWL_RATE_54M_INDEX; 2039 if (is_ht(rate)) 2040 return index == IWL_RATE_MCS_7_INDEX; 2041 if (is_vht(rate)) 2042 return index == IWL_RATE_MCS_7_INDEX || 2043 index == IWL_RATE_MCS_8_INDEX || 2044 index == IWL_RATE_MCS_9_INDEX; 2045 2046 WARN_ON_ONCE(1); 2047 return false; 2048 } 2049 2050 enum tpc_action { 2051 TPC_ACTION_STAY, 2052 TPC_ACTION_DECREASE, 2053 TPC_ACTION_INCREASE, 2054 TPC_ACTION_NO_RESTIRCTION, 2055 }; 2056 2057 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm, 2058 s32 sr, int weak, int strong, 2059 int current_tpt, 2060 int weak_tpt, int strong_tpt) 2061 { 2062 /* stay until we have valid tpt */ 2063 if (current_tpt == IWL_INVALID_VALUE) { 2064 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n"); 2065 return TPC_ACTION_STAY; 2066 } 2067 2068 /* Too many failures, increase txp */ 2069 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) || 2070 current_tpt == 0) { 2071 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n"); 2072 return TPC_ACTION_NO_RESTIRCTION; 2073 } 2074 2075 /* try decreasing first if applicable */ 2076 if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) && 2077 weak != TPC_INVALID) { 2078 if (weak_tpt == IWL_INVALID_VALUE && 2079 (strong_tpt == IWL_INVALID_VALUE || 2080 current_tpt >= strong_tpt)) { 2081 IWL_DEBUG_RATE(mvm, 2082 "no weak txp measurement. decrease txp\n"); 2083 return TPC_ACTION_DECREASE; 2084 } 2085 2086 if (weak_tpt > current_tpt) { 2087 IWL_DEBUG_RATE(mvm, 2088 "lower txp has better tpt. decrease txp\n"); 2089 return TPC_ACTION_DECREASE; 2090 } 2091 } 2092 2093 /* next, increase if needed */ 2094 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) && 2095 strong != TPC_INVALID) { 2096 if (weak_tpt == IWL_INVALID_VALUE && 2097 strong_tpt != IWL_INVALID_VALUE && 2098 current_tpt < strong_tpt) { 2099 IWL_DEBUG_RATE(mvm, 2100 "higher txp has better tpt. increase txp\n"); 2101 return TPC_ACTION_INCREASE; 2102 } 2103 2104 if (weak_tpt < current_tpt && 2105 (strong_tpt == IWL_INVALID_VALUE || 2106 strong_tpt > current_tpt)) { 2107 IWL_DEBUG_RATE(mvm, 2108 "lower txp has worse tpt. increase txp\n"); 2109 return TPC_ACTION_INCREASE; 2110 } 2111 } 2112 2113 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n"); 2114 return TPC_ACTION_STAY; 2115 } 2116 2117 static bool rs_tpc_perform(struct iwl_mvm *mvm, 2118 struct ieee80211_sta *sta, 2119 struct iwl_lq_sta *lq_sta, 2120 struct iwl_scale_tbl_info *tbl) 2121 { 2122 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta); 2123 struct ieee80211_vif *vif = mvm_sta->vif; 2124 struct ieee80211_chanctx_conf *chanctx_conf; 2125 enum nl80211_band band; 2126 struct iwl_rate_scale_data *window; 2127 struct rs_rate *rate = &tbl->rate; 2128 enum tpc_action action; 2129 s32 sr; 2130 u8 cur = lq_sta->lq.reduced_tpc; 2131 int current_tpt; 2132 int weak, strong; 2133 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE; 2134 2135 #ifdef CONFIG_MAC80211_DEBUGFS 2136 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) { 2137 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n", 2138 lq_sta->pers.dbg_fixed_txp_reduction); 2139 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction; 2140 return cur != lq_sta->pers.dbg_fixed_txp_reduction; 2141 } 2142 #endif 2143 2144 rcu_read_lock(); 2145 chanctx_conf = rcu_dereference(vif->chanctx_conf); 2146 if (WARN_ON(!chanctx_conf)) 2147 band = NUM_NL80211_BANDS; 2148 else 2149 band = chanctx_conf->def.chan->band; 2150 rcu_read_unlock(); 2151 2152 if (!rs_tpc_allowed(mvm, vif, rate, band)) { 2153 IWL_DEBUG_RATE(mvm, 2154 "tpc is not allowed. remove txp restrictions\n"); 2155 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 2156 return cur != TPC_NO_REDUCTION; 2157 } 2158 2159 rs_get_adjacent_txp(mvm, cur, &weak, &strong); 2160 2161 /* Collect measured throughputs for current and adjacent rates */ 2162 window = tbl->tpc_win; 2163 sr = window[cur].success_ratio; 2164 current_tpt = window[cur].average_tpt; 2165 if (weak != TPC_INVALID) 2166 weak_tpt = window[weak].average_tpt; 2167 if (strong != TPC_INVALID) 2168 strong_tpt = window[strong].average_tpt; 2169 2170 IWL_DEBUG_RATE(mvm, 2171 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n", 2172 cur, current_tpt, sr, weak, strong, 2173 weak_tpt, strong_tpt); 2174 2175 action = rs_get_tpc_action(mvm, sr, weak, strong, 2176 current_tpt, weak_tpt, strong_tpt); 2177 2178 /* override actions if we are on the edge */ 2179 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) { 2180 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n"); 2181 action = TPC_ACTION_STAY; 2182 } else if (strong == TPC_INVALID && 2183 (action == TPC_ACTION_INCREASE || 2184 action == TPC_ACTION_NO_RESTIRCTION)) { 2185 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n"); 2186 action = TPC_ACTION_STAY; 2187 } 2188 2189 switch (action) { 2190 case TPC_ACTION_DECREASE: 2191 lq_sta->lq.reduced_tpc = weak; 2192 return true; 2193 case TPC_ACTION_INCREASE: 2194 lq_sta->lq.reduced_tpc = strong; 2195 return true; 2196 case TPC_ACTION_NO_RESTIRCTION: 2197 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 2198 return true; 2199 case TPC_ACTION_STAY: 2200 /* do nothing */ 2201 break; 2202 } 2203 return false; 2204 } 2205 2206 /* 2207 * Do rate scaling and search for new modulation mode. 2208 */ 2209 static void rs_rate_scale_perform(struct iwl_mvm *mvm, 2210 struct ieee80211_sta *sta, 2211 struct iwl_lq_sta *lq_sta, 2212 int tid, bool ndp) 2213 { 2214 int low = IWL_RATE_INVALID; 2215 int high = IWL_RATE_INVALID; 2216 int index; 2217 struct iwl_rate_scale_data *window = NULL; 2218 int current_tpt = IWL_INVALID_VALUE; 2219 int low_tpt = IWL_INVALID_VALUE; 2220 int high_tpt = IWL_INVALID_VALUE; 2221 u32 fail_count; 2222 enum rs_action scale_action = RS_ACTION_STAY; 2223 u16 rate_mask; 2224 u8 update_lq = 0; 2225 struct iwl_scale_tbl_info *tbl, *tbl1; 2226 u8 active_tbl = 0; 2227 u8 done_search = 0; 2228 u16 high_low; 2229 s32 sr; 2230 u8 prev_agg = lq_sta->is_agg; 2231 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta); 2232 struct iwl_mvm_tid_data *tid_data; 2233 struct rs_rate *rate; 2234 2235 lq_sta->is_agg = !!sta_priv->agg_tids; 2236 2237 /* 2238 * Select rate-scale / modulation-mode table to work with in 2239 * the rest of this function: "search" if searching for better 2240 * modulation mode, or "active" if doing rate scaling within a mode. 2241 */ 2242 if (!lq_sta->search_better_tbl) 2243 active_tbl = lq_sta->active_tbl; 2244 else 2245 active_tbl = 1 - lq_sta->active_tbl; 2246 2247 tbl = &(lq_sta->lq_info[active_tbl]); 2248 rate = &tbl->rate; 2249 2250 if (prev_agg != lq_sta->is_agg) { 2251 IWL_DEBUG_RATE(mvm, 2252 "Aggregation changed: prev %d current %d. Update expected TPT table\n", 2253 prev_agg, lq_sta->is_agg); 2254 rs_set_expected_tpt_table(lq_sta, tbl); 2255 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2256 } 2257 2258 /* current tx rate */ 2259 index = rate->index; 2260 2261 /* rates available for this association, and for modulation mode */ 2262 rate_mask = rs_get_supported_rates(lq_sta, rate); 2263 2264 if (!(BIT(index) & rate_mask)) { 2265 IWL_ERR(mvm, "Current Rate is not valid\n"); 2266 if (lq_sta->search_better_tbl) { 2267 /* revert to active table if search table is not valid*/ 2268 rate->type = LQ_NONE; 2269 lq_sta->search_better_tbl = 0; 2270 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 2271 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2272 } 2273 return; 2274 } 2275 2276 /* Get expected throughput table and history window for current rate */ 2277 if (!tbl->expected_tpt) { 2278 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n"); 2279 return; 2280 } 2281 2282 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2283 window = &(tbl->win[index]); 2284 2285 /* 2286 * If there is not enough history to calculate actual average 2287 * throughput, keep analyzing results of more tx frames, without 2288 * changing rate or mode (bypass most of the rest of this function). 2289 * Set up new rate table in uCode only if old rate is not supported 2290 * in current association (use new rate found above). 2291 */ 2292 fail_count = window->counter - window->success_counter; 2293 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) && 2294 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) { 2295 IWL_DEBUG_RATE(mvm, 2296 "%s: Test Window: succ %d total %d\n", 2297 rs_pretty_rate(rate), 2298 window->success_counter, window->counter); 2299 2300 /* Can't calculate this yet; not enough history */ 2301 window->average_tpt = IWL_INVALID_VALUE; 2302 2303 /* Should we stay with this modulation mode, 2304 * or search for a new one? */ 2305 rs_stay_in_table(lq_sta, false); 2306 2307 return; 2308 } 2309 2310 /* If we are searching for better modulation mode, check success. */ 2311 if (lq_sta->search_better_tbl) { 2312 /* If good success, continue using the "search" mode; 2313 * no need to send new link quality command, since we're 2314 * continuing to use the setup that we've been trying. */ 2315 if (window->average_tpt > lq_sta->last_tpt) { 2316 IWL_DEBUG_RATE(mvm, 2317 "SWITCHING TO NEW TABLE SR: %d " 2318 "cur-tpt %d old-tpt %d\n", 2319 window->success_ratio, 2320 window->average_tpt, 2321 lq_sta->last_tpt); 2322 2323 /* Swap tables; "search" becomes "active" */ 2324 lq_sta->active_tbl = active_tbl; 2325 current_tpt = window->average_tpt; 2326 /* Else poor success; go back to mode in "active" table */ 2327 } else { 2328 IWL_DEBUG_RATE(mvm, 2329 "GOING BACK TO THE OLD TABLE: SR %d " 2330 "cur-tpt %d old-tpt %d\n", 2331 window->success_ratio, 2332 window->average_tpt, 2333 lq_sta->last_tpt); 2334 2335 /* Nullify "search" table */ 2336 rate->type = LQ_NONE; 2337 2338 /* Revert to "active" table */ 2339 active_tbl = lq_sta->active_tbl; 2340 tbl = &(lq_sta->lq_info[active_tbl]); 2341 2342 /* Revert to "active" rate and throughput info */ 2343 index = tbl->rate.index; 2344 current_tpt = lq_sta->last_tpt; 2345 2346 /* Need to set up a new rate table in uCode */ 2347 update_lq = 1; 2348 } 2349 2350 /* Either way, we've made a decision; modulation mode 2351 * search is done, allow rate adjustment next time. */ 2352 lq_sta->search_better_tbl = 0; 2353 done_search = 1; /* Don't switch modes below! */ 2354 goto lq_update; 2355 } 2356 2357 /* (Else) not in search of better modulation mode, try for better 2358 * starting rate, while staying in this mode. */ 2359 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type); 2360 low = high_low & 0xff; 2361 high = (high_low >> 8) & 0xff; 2362 2363 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2364 2365 sr = window->success_ratio; 2366 2367 /* Collect measured throughputs for current and adjacent rates */ 2368 current_tpt = window->average_tpt; 2369 if (low != IWL_RATE_INVALID) 2370 low_tpt = tbl->win[low].average_tpt; 2371 if (high != IWL_RATE_INVALID) 2372 high_tpt = tbl->win[high].average_tpt; 2373 2374 IWL_DEBUG_RATE(mvm, 2375 "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n", 2376 rs_pretty_rate(rate), current_tpt, sr, 2377 low, high, low_tpt, high_tpt); 2378 2379 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high, 2380 current_tpt, low_tpt, high_tpt); 2381 2382 /* Force a search in case BT doesn't like us being in MIMO */ 2383 if (is_mimo(rate) && 2384 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) { 2385 IWL_DEBUG_RATE(mvm, 2386 "BT Coex forbids MIMO. Search for new config\n"); 2387 rs_stay_in_table(lq_sta, true); 2388 goto lq_update; 2389 } 2390 2391 switch (scale_action) { 2392 case RS_ACTION_DOWNSCALE: 2393 /* Decrease starting rate, update uCode's rate table */ 2394 if (low != IWL_RATE_INVALID) { 2395 update_lq = 1; 2396 index = low; 2397 } else { 2398 IWL_DEBUG_RATE(mvm, 2399 "At the bottom rate. Can't decrease\n"); 2400 } 2401 2402 break; 2403 case RS_ACTION_UPSCALE: 2404 /* Increase starting rate, update uCode's rate table */ 2405 if (high != IWL_RATE_INVALID) { 2406 update_lq = 1; 2407 index = high; 2408 } else { 2409 IWL_DEBUG_RATE(mvm, 2410 "At the top rate. Can't increase\n"); 2411 } 2412 2413 break; 2414 case RS_ACTION_STAY: 2415 /* No change */ 2416 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) 2417 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl); 2418 break; 2419 default: 2420 break; 2421 } 2422 2423 lq_update: 2424 /* Replace uCode's rate table for the destination station. */ 2425 if (update_lq) { 2426 tbl->rate.index = index; 2427 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK) 2428 rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action); 2429 rs_set_amsdu_len(mvm, sta, tbl, scale_action); 2430 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2431 } 2432 2433 rs_stay_in_table(lq_sta, false); 2434 2435 /* 2436 * Search for new modulation mode if we're: 2437 * 1) Not changing rates right now 2438 * 2) Not just finishing up a search 2439 * 3) Allowing a new search 2440 */ 2441 if (!update_lq && !done_search && 2442 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED 2443 && window->counter) { 2444 enum rs_column next_column; 2445 2446 /* Save current throughput to compare with "search" throughput*/ 2447 lq_sta->last_tpt = current_tpt; 2448 2449 IWL_DEBUG_RATE(mvm, 2450 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n", 2451 update_lq, done_search, lq_sta->rs_state, 2452 window->counter); 2453 2454 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl); 2455 if (next_column != RS_COLUMN_INVALID) { 2456 int ret = rs_switch_to_column(mvm, lq_sta, sta, 2457 next_column); 2458 if (!ret) 2459 lq_sta->search_better_tbl = 1; 2460 } else { 2461 IWL_DEBUG_RATE(mvm, 2462 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n"); 2463 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED; 2464 } 2465 2466 /* If new "search" mode was selected, set up in uCode table */ 2467 if (lq_sta->search_better_tbl) { 2468 /* Access the "search" table, clear its history. */ 2469 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 2470 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2471 2472 /* Use new "search" start rate */ 2473 index = tbl->rate.index; 2474 2475 rs_dump_rate(mvm, &tbl->rate, 2476 "Switch to SEARCH TABLE:"); 2477 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2478 } else { 2479 done_search = 1; 2480 } 2481 } 2482 2483 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) { 2484 /* If the "active" (non-search) mode was legacy, 2485 * and we've tried switching antennas, 2486 * but we haven't been able to try HT modes (not available), 2487 * stay with best antenna legacy modulation for a while 2488 * before next round of mode comparisons. */ 2489 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]); 2490 if (is_legacy(&tbl1->rate)) { 2491 IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n"); 2492 2493 if (tid != IWL_MAX_TID_COUNT) { 2494 tid_data = &sta_priv->tid_data[tid]; 2495 if (tid_data->state != IWL_AGG_OFF) { 2496 IWL_DEBUG_RATE(mvm, 2497 "Stop aggregation on tid %d\n", 2498 tid); 2499 ieee80211_stop_tx_ba_session(sta, tid); 2500 } 2501 } 2502 rs_set_stay_in_table(mvm, 1, lq_sta); 2503 } else { 2504 /* If we're in an HT mode, and all 3 mode switch actions 2505 * have been tried and compared, stay in this best modulation 2506 * mode for a while before next round of mode comparisons. */ 2507 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) && 2508 (lq_sta->tx_agg_tid_en & (1 << tid)) && 2509 (tid != IWL_MAX_TID_COUNT)) { 2510 tid_data = &sta_priv->tid_data[tid]; 2511 if (tid_data->state == IWL_AGG_OFF && !ndp) { 2512 IWL_DEBUG_RATE(mvm, 2513 "try to aggregate tid %d\n", 2514 tid); 2515 rs_tl_turn_on_agg(mvm, tid, 2516 lq_sta, sta); 2517 } 2518 } 2519 rs_set_stay_in_table(mvm, 0, lq_sta); 2520 } 2521 } 2522 } 2523 2524 struct rs_init_rate_info { 2525 s8 rssi; 2526 u8 rate_idx; 2527 }; 2528 2529 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = { 2530 { -60, IWL_RATE_54M_INDEX }, 2531 { -64, IWL_RATE_48M_INDEX }, 2532 { -68, IWL_RATE_36M_INDEX }, 2533 { -80, IWL_RATE_24M_INDEX }, 2534 { -84, IWL_RATE_18M_INDEX }, 2535 { -85, IWL_RATE_12M_INDEX }, 2536 { -86, IWL_RATE_11M_INDEX }, 2537 { -88, IWL_RATE_5M_INDEX }, 2538 { -90, IWL_RATE_2M_INDEX }, 2539 { S8_MIN, IWL_RATE_1M_INDEX }, 2540 }; 2541 2542 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = { 2543 { -60, IWL_RATE_54M_INDEX }, 2544 { -64, IWL_RATE_48M_INDEX }, 2545 { -72, IWL_RATE_36M_INDEX }, 2546 { -80, IWL_RATE_24M_INDEX }, 2547 { -84, IWL_RATE_18M_INDEX }, 2548 { -85, IWL_RATE_12M_INDEX }, 2549 { -87, IWL_RATE_9M_INDEX }, 2550 { S8_MIN, IWL_RATE_6M_INDEX }, 2551 }; 2552 2553 static const struct rs_init_rate_info rs_optimal_rates_ht[] = { 2554 { -60, IWL_RATE_MCS_7_INDEX }, 2555 { -64, IWL_RATE_MCS_6_INDEX }, 2556 { -68, IWL_RATE_MCS_5_INDEX }, 2557 { -72, IWL_RATE_MCS_4_INDEX }, 2558 { -80, IWL_RATE_MCS_3_INDEX }, 2559 { -84, IWL_RATE_MCS_2_INDEX }, 2560 { -85, IWL_RATE_MCS_1_INDEX }, 2561 { S8_MIN, IWL_RATE_MCS_0_INDEX}, 2562 }; 2563 2564 /* MCS index 9 is not valid for 20MHz VHT channel width, 2565 * but is ok for 40, 80 and 160MHz channels. 2566 */ 2567 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = { 2568 { -60, IWL_RATE_MCS_8_INDEX }, 2569 { -64, IWL_RATE_MCS_7_INDEX }, 2570 { -68, IWL_RATE_MCS_6_INDEX }, 2571 { -72, IWL_RATE_MCS_5_INDEX }, 2572 { -80, IWL_RATE_MCS_4_INDEX }, 2573 { -84, IWL_RATE_MCS_3_INDEX }, 2574 { -85, IWL_RATE_MCS_2_INDEX }, 2575 { -87, IWL_RATE_MCS_1_INDEX }, 2576 { S8_MIN, IWL_RATE_MCS_0_INDEX}, 2577 }; 2578 2579 static const struct rs_init_rate_info rs_optimal_rates_vht[] = { 2580 { -60, IWL_RATE_MCS_9_INDEX }, 2581 { -64, IWL_RATE_MCS_8_INDEX }, 2582 { -68, IWL_RATE_MCS_7_INDEX }, 2583 { -72, IWL_RATE_MCS_6_INDEX }, 2584 { -80, IWL_RATE_MCS_5_INDEX }, 2585 { -84, IWL_RATE_MCS_4_INDEX }, 2586 { -85, IWL_RATE_MCS_3_INDEX }, 2587 { -87, IWL_RATE_MCS_2_INDEX }, 2588 { -88, IWL_RATE_MCS_1_INDEX }, 2589 { S8_MIN, IWL_RATE_MCS_0_INDEX }, 2590 }; 2591 2592 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */ 2593 2594 /* Init the optimal rate based on STA caps 2595 * This combined with rssi is used to report the last tx rate 2596 * to userspace when we haven't transmitted enough frames. 2597 */ 2598 static void rs_init_optimal_rate(struct iwl_mvm *mvm, 2599 struct ieee80211_sta *sta, 2600 struct iwl_lq_sta *lq_sta) 2601 { 2602 struct rs_rate *rate = &lq_sta->optimal_rate; 2603 2604 if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID) 2605 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; 2606 else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID) 2607 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; 2608 else if (lq_sta->band == NL80211_BAND_5GHZ) 2609 rate->type = LQ_LEGACY_A; 2610 else 2611 rate->type = LQ_LEGACY_G; 2612 2613 rate->bw = rs_bw_from_sta_bw(sta); 2614 rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL); 2615 2616 /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */ 2617 2618 if (is_mimo(rate)) { 2619 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate; 2620 } else if (is_siso(rate)) { 2621 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate; 2622 } else { 2623 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate; 2624 2625 if (lq_sta->band == NL80211_BAND_5GHZ) { 2626 lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy; 2627 lq_sta->optimal_nentries = 2628 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy); 2629 } else { 2630 lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy; 2631 lq_sta->optimal_nentries = 2632 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy); 2633 } 2634 } 2635 2636 if (is_vht(rate)) { 2637 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) { 2638 lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz; 2639 lq_sta->optimal_nentries = 2640 ARRAY_SIZE(rs_optimal_rates_vht_20mhz); 2641 } else { 2642 lq_sta->optimal_rates = rs_optimal_rates_vht; 2643 lq_sta->optimal_nentries = 2644 ARRAY_SIZE(rs_optimal_rates_vht); 2645 } 2646 } else if (is_ht(rate)) { 2647 lq_sta->optimal_rates = rs_optimal_rates_ht; 2648 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht); 2649 } 2650 } 2651 2652 /* Compute the optimal rate index based on RSSI */ 2653 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm, 2654 struct iwl_lq_sta *lq_sta) 2655 { 2656 struct rs_rate *rate = &lq_sta->optimal_rate; 2657 int i; 2658 2659 rate->index = find_first_bit(&lq_sta->optimal_rate_mask, 2660 BITS_PER_LONG); 2661 2662 for (i = 0; i < lq_sta->optimal_nentries; i++) { 2663 int rate_idx = lq_sta->optimal_rates[i].rate_idx; 2664 2665 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) && 2666 (BIT(rate_idx) & lq_sta->optimal_rate_mask)) { 2667 rate->index = rate_idx; 2668 break; 2669 } 2670 } 2671 2672 return rate; 2673 } 2674 2675 /* Choose an initial legacy rate and antenna to use based on the RSSI 2676 * of last Rx 2677 */ 2678 static void rs_get_initial_rate(struct iwl_mvm *mvm, 2679 struct ieee80211_sta *sta, 2680 struct iwl_lq_sta *lq_sta, 2681 enum nl80211_band band, 2682 struct rs_rate *rate) 2683 { 2684 int i, nentries; 2685 unsigned long active_rate; 2686 s8 best_rssi = S8_MIN; 2687 u8 best_ant = ANT_NONE; 2688 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 2689 const struct rs_init_rate_info *initial_rates; 2690 2691 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { 2692 if (!(lq_sta->pers.chains & BIT(i))) 2693 continue; 2694 2695 if (lq_sta->pers.chain_signal[i] > best_rssi) { 2696 best_rssi = lq_sta->pers.chain_signal[i]; 2697 best_ant = BIT(i); 2698 } 2699 } 2700 2701 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n", 2702 rs_pretty_ant(best_ant), best_rssi); 2703 2704 if (best_ant != ANT_A && best_ant != ANT_B) 2705 rate->ant = first_antenna(valid_tx_ant); 2706 else 2707 rate->ant = best_ant; 2708 2709 rate->sgi = false; 2710 rate->ldpc = false; 2711 rate->bw = RATE_MCS_CHAN_WIDTH_20; 2712 2713 rate->index = find_first_bit(&lq_sta->active_legacy_rate, 2714 BITS_PER_LONG); 2715 2716 if (band == NL80211_BAND_5GHZ) { 2717 rate->type = LQ_LEGACY_A; 2718 initial_rates = rs_optimal_rates_5ghz_legacy; 2719 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy); 2720 } else { 2721 rate->type = LQ_LEGACY_G; 2722 initial_rates = rs_optimal_rates_24ghz_legacy; 2723 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy); 2724 } 2725 2726 if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE) 2727 goto out; 2728 2729 /* Start from a higher rate if the corresponding debug capability 2730 * is enabled. The rate is chosen according to AP capabilities. 2731 * In case of VHT/HT when the rssi is low fallback to the case of 2732 * legacy rates. 2733 */ 2734 if (sta->vht_cap.vht_supported && 2735 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { 2736 switch (sta->bandwidth) { 2737 case IEEE80211_STA_RX_BW_160: 2738 case IEEE80211_STA_RX_BW_80: 2739 case IEEE80211_STA_RX_BW_40: 2740 initial_rates = rs_optimal_rates_vht; 2741 nentries = ARRAY_SIZE(rs_optimal_rates_vht); 2742 break; 2743 case IEEE80211_STA_RX_BW_20: 2744 initial_rates = rs_optimal_rates_vht_20mhz; 2745 nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz); 2746 break; 2747 default: 2748 IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth); 2749 goto out; 2750 } 2751 2752 active_rate = lq_sta->active_siso_rate; 2753 rate->type = LQ_VHT_SISO; 2754 rate->bw = rs_bw_from_sta_bw(sta); 2755 } else if (sta->ht_cap.ht_supported && 2756 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { 2757 initial_rates = rs_optimal_rates_ht; 2758 nentries = ARRAY_SIZE(rs_optimal_rates_ht); 2759 active_rate = lq_sta->active_siso_rate; 2760 rate->type = LQ_HT_SISO; 2761 } else { 2762 active_rate = lq_sta->active_legacy_rate; 2763 } 2764 2765 for (i = 0; i < nentries; i++) { 2766 int rate_idx = initial_rates[i].rate_idx; 2767 2768 if ((best_rssi >= initial_rates[i].rssi) && 2769 (BIT(rate_idx) & active_rate)) { 2770 rate->index = rate_idx; 2771 break; 2772 } 2773 } 2774 2775 out: 2776 rs_dump_rate(mvm, rate, "INITIAL"); 2777 } 2778 2779 /* Save info about RSSI of last Rx */ 2780 void rs_update_last_rssi(struct iwl_mvm *mvm, 2781 struct iwl_lq_sta *lq_sta, 2782 struct ieee80211_rx_status *rx_status) 2783 { 2784 int i; 2785 2786 lq_sta->pers.chains = rx_status->chains; 2787 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0]; 2788 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1]; 2789 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2]; 2790 lq_sta->pers.last_rssi = S8_MIN; 2791 2792 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { 2793 if (!(lq_sta->pers.chains & BIT(i))) 2794 continue; 2795 2796 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi) 2797 lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i]; 2798 } 2799 } 2800 2801 /** 2802 * rs_initialize_lq - Initialize a station's hardware rate table 2803 * 2804 * The uCode's station table contains a table of fallback rates 2805 * for automatic fallback during transmission. 2806 * 2807 * NOTE: This sets up a default set of values. These will be replaced later 2808 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of 2809 * rc80211_simple. 2810 * 2811 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before 2812 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD, 2813 * which requires station table entry to exist). 2814 */ 2815 static void rs_initialize_lq(struct iwl_mvm *mvm, 2816 struct ieee80211_sta *sta, 2817 struct iwl_lq_sta *lq_sta, 2818 enum nl80211_band band, 2819 bool init) 2820 { 2821 struct iwl_scale_tbl_info *tbl; 2822 struct rs_rate *rate; 2823 u8 active_tbl = 0; 2824 2825 if (!sta || !lq_sta) 2826 return; 2827 2828 if (!lq_sta->search_better_tbl) 2829 active_tbl = lq_sta->active_tbl; 2830 else 2831 active_tbl = 1 - lq_sta->active_tbl; 2832 2833 tbl = &(lq_sta->lq_info[active_tbl]); 2834 rate = &tbl->rate; 2835 2836 rs_get_initial_rate(mvm, sta, lq_sta, band, rate); 2837 rs_init_optimal_rate(mvm, sta, lq_sta); 2838 2839 WARN_ONCE(rate->ant != ANT_A && rate->ant != ANT_B, 2840 "ant: 0x%x, chains 0x%x, fw tx ant: 0x%x, nvm tx ant: 0x%x\n", 2841 rate->ant, lq_sta->pers.chains, mvm->fw->valid_tx_ant, 2842 mvm->nvm_data ? mvm->nvm_data->valid_tx_ant : ANT_INVALID); 2843 2844 tbl->column = rs_get_column_from_rate(rate); 2845 2846 rs_set_expected_tpt_table(lq_sta, tbl); 2847 rs_fill_lq_cmd(mvm, sta, lq_sta, rate); 2848 /* TODO restore station should remember the lq cmd */ 2849 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init); 2850 } 2851 2852 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta, 2853 struct ieee80211_tx_rate_control *txrc) 2854 { 2855 struct sk_buff *skb = txrc->skb; 2856 struct iwl_op_mode *op_mode __maybe_unused = 2857 (struct iwl_op_mode *)mvm_r; 2858 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 2859 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2860 struct iwl_lq_sta *lq_sta = mvm_sta; 2861 struct rs_rate *optimal_rate; 2862 u32 last_ucode_rate; 2863 2864 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) { 2865 /* if vif isn't initialized mvm doesn't know about 2866 * this station, so don't do anything with the it 2867 */ 2868 sta = NULL; 2869 mvm_sta = NULL; 2870 } 2871 2872 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2873 2874 /* Treat uninitialized rate scaling data same as non-existing. */ 2875 if (lq_sta && !lq_sta->pers.drv) { 2876 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n"); 2877 mvm_sta = NULL; 2878 } 2879 2880 /* Send management frames and NO_ACK data using lowest rate. */ 2881 if (rate_control_send_low(sta, mvm_sta, txrc)) 2882 return; 2883 2884 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags, 2885 info->band, &info->control.rates[0]); 2886 info->control.rates[0].count = 1; 2887 2888 /* Report the optimal rate based on rssi and STA caps if we haven't 2889 * converged yet (too little traffic) or exploring other modulations 2890 */ 2891 if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) { 2892 optimal_rate = rs_get_optimal_rate(mvm, lq_sta); 2893 last_ucode_rate = ucode_rate_from_rs_rate(mvm, 2894 optimal_rate); 2895 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band, 2896 &txrc->reported_rate); 2897 } 2898 } 2899 2900 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta, 2901 gfp_t gfp) 2902 { 2903 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta); 2904 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate; 2905 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 2906 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta; 2907 2908 IWL_DEBUG_RATE(mvm, "create station rate scale window\n"); 2909 2910 lq_sta->pers.drv = mvm; 2911 #ifdef CONFIG_MAC80211_DEBUGFS 2912 lq_sta->pers.dbg_fixed_rate = 0; 2913 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID; 2914 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 2915 #endif 2916 lq_sta->pers.chains = 0; 2917 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal)); 2918 lq_sta->pers.last_rssi = S8_MIN; 2919 2920 return &sta_priv->lq_sta; 2921 } 2922 2923 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap, 2924 int nss) 2925 { 2926 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) & 2927 (0x3 << (2 * (nss - 1))); 2928 rx_mcs >>= (2 * (nss - 1)); 2929 2930 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7) 2931 return IWL_RATE_MCS_7_INDEX; 2932 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8) 2933 return IWL_RATE_MCS_8_INDEX; 2934 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9) 2935 return IWL_RATE_MCS_9_INDEX; 2936 2937 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED); 2938 return -1; 2939 } 2940 2941 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta, 2942 struct ieee80211_sta_vht_cap *vht_cap, 2943 struct iwl_lq_sta *lq_sta) 2944 { 2945 int i; 2946 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1); 2947 2948 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 2949 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 2950 if (i == IWL_RATE_9M_INDEX) 2951 continue; 2952 2953 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 2954 if (i == IWL_RATE_MCS_9_INDEX && 2955 sta->bandwidth == IEEE80211_STA_RX_BW_20) 2956 continue; 2957 2958 lq_sta->active_siso_rate |= BIT(i); 2959 } 2960 } 2961 2962 if (sta->rx_nss < 2) 2963 return; 2964 2965 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2); 2966 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 2967 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 2968 if (i == IWL_RATE_9M_INDEX) 2969 continue; 2970 2971 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 2972 if (i == IWL_RATE_MCS_9_INDEX && 2973 sta->bandwidth == IEEE80211_STA_RX_BW_20) 2974 continue; 2975 2976 lq_sta->active_mimo2_rate |= BIT(i); 2977 } 2978 } 2979 } 2980 2981 static void rs_ht_init(struct iwl_mvm *mvm, 2982 struct ieee80211_sta *sta, 2983 struct iwl_lq_sta *lq_sta, 2984 struct ieee80211_sta_ht_cap *ht_cap) 2985 { 2986 /* active_siso_rate mask includes 9 MBits (bit 5), 2987 * and CCK (bits 0-3), supp_rates[] does not; 2988 * shift to convert format, force 9 MBits off. 2989 */ 2990 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1; 2991 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1; 2992 lq_sta->active_siso_rate &= ~((u16)0x2); 2993 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE; 2994 2995 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1; 2996 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1; 2997 lq_sta->active_mimo2_rate &= ~((u16)0x2); 2998 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE; 2999 3000 if (mvm->cfg->ht_params->ldpc && 3001 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING)) 3002 lq_sta->ldpc = true; 3003 3004 if (mvm->cfg->ht_params->stbc && 3005 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 3006 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC)) 3007 lq_sta->stbc_capable = true; 3008 3009 lq_sta->is_vht = false; 3010 } 3011 3012 static void rs_vht_init(struct iwl_mvm *mvm, 3013 struct ieee80211_sta *sta, 3014 struct iwl_lq_sta *lq_sta, 3015 struct ieee80211_sta_vht_cap *vht_cap) 3016 { 3017 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta); 3018 3019 if (mvm->cfg->ht_params->ldpc && 3020 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC)) 3021 lq_sta->ldpc = true; 3022 3023 if (mvm->cfg->ht_params->stbc && 3024 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 3025 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK)) 3026 lq_sta->stbc_capable = true; 3027 3028 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) && 3029 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 3030 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE)) 3031 lq_sta->bfer_capable = true; 3032 3033 lq_sta->is_vht = true; 3034 } 3035 3036 #ifdef CONFIG_IWLWIFI_DEBUGFS 3037 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm) 3038 { 3039 spin_lock_bh(&mvm->drv_stats_lock); 3040 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats)); 3041 spin_unlock_bh(&mvm->drv_stats_lock); 3042 } 3043 3044 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg) 3045 { 3046 u8 nss = 0; 3047 3048 spin_lock(&mvm->drv_stats_lock); 3049 3050 if (agg) 3051 mvm->drv_rx_stats.agg_frames++; 3052 3053 mvm->drv_rx_stats.success_frames++; 3054 3055 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { 3056 case RATE_MCS_CHAN_WIDTH_20: 3057 mvm->drv_rx_stats.bw_20_frames++; 3058 break; 3059 case RATE_MCS_CHAN_WIDTH_40: 3060 mvm->drv_rx_stats.bw_40_frames++; 3061 break; 3062 case RATE_MCS_CHAN_WIDTH_80: 3063 mvm->drv_rx_stats.bw_80_frames++; 3064 break; 3065 case RATE_MCS_CHAN_WIDTH_160: 3066 mvm->drv_rx_stats.bw_160_frames++; 3067 break; 3068 default: 3069 WARN_ONCE(1, "bad BW. rate 0x%x", rate); 3070 } 3071 3072 if (rate & RATE_MCS_HT_MSK) { 3073 mvm->drv_rx_stats.ht_frames++; 3074 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1; 3075 } else if (rate & RATE_MCS_VHT_MSK) { 3076 mvm->drv_rx_stats.vht_frames++; 3077 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >> 3078 RATE_VHT_MCS_NSS_POS) + 1; 3079 } else { 3080 mvm->drv_rx_stats.legacy_frames++; 3081 } 3082 3083 if (nss == 1) 3084 mvm->drv_rx_stats.siso_frames++; 3085 else if (nss == 2) 3086 mvm->drv_rx_stats.mimo2_frames++; 3087 3088 if (rate & RATE_MCS_SGI_MSK) 3089 mvm->drv_rx_stats.sgi_frames++; 3090 else 3091 mvm->drv_rx_stats.ngi_frames++; 3092 3093 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate; 3094 mvm->drv_rx_stats.last_frame_idx = 3095 (mvm->drv_rx_stats.last_frame_idx + 1) % 3096 ARRAY_SIZE(mvm->drv_rx_stats.last_rates); 3097 3098 spin_unlock(&mvm->drv_stats_lock); 3099 } 3100 #endif 3101 3102 /* 3103 * Called after adding a new station to initialize rate scaling 3104 */ 3105 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 3106 enum nl80211_band band, bool init) 3107 { 3108 int i, j; 3109 struct ieee80211_hw *hw = mvm->hw; 3110 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 3111 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; 3112 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta); 3113 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta; 3114 struct ieee80211_supported_band *sband; 3115 unsigned long supp; /* must be unsigned long for for_each_set_bit */ 3116 3117 /* clear all non-persistent lq data */ 3118 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers)); 3119 3120 sband = hw->wiphy->bands[band]; 3121 3122 lq_sta->lq.sta_id = sta_priv->sta_id; 3123 sta_priv->tlc_amsdu = false; 3124 3125 for (j = 0; j < LQ_SIZE; j++) 3126 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]); 3127 3128 lq_sta->flush_timer = 0; 3129 lq_sta->last_tx = jiffies; 3130 3131 IWL_DEBUG_RATE(mvm, 3132 "LQ: *** rate scale station global init for station %d ***\n", 3133 sta_priv->sta_id); 3134 /* TODO: what is a good starting rate for STA? About middle? Maybe not 3135 * the lowest or the highest rate.. Could consider using RSSI from 3136 * previous packets? Need to have IEEE 802.1X auth succeed immediately 3137 * after assoc.. */ 3138 3139 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX; 3140 lq_sta->band = sband->band; 3141 /* 3142 * active legacy rates as per supported rates bitmap 3143 */ 3144 supp = sta->supp_rates[sband->band]; 3145 lq_sta->active_legacy_rate = 0; 3146 for_each_set_bit(i, &supp, BITS_PER_LONG) 3147 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value); 3148 3149 /* TODO: should probably account for rx_highest for both HT/VHT */ 3150 if (!vht_cap || !vht_cap->vht_supported) 3151 rs_ht_init(mvm, sta, lq_sta, ht_cap); 3152 else 3153 rs_vht_init(mvm, sta, lq_sta, vht_cap); 3154 3155 lq_sta->max_legacy_rate_idx = 3156 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate); 3157 lq_sta->max_siso_rate_idx = 3158 rs_get_max_rate_from_mask(lq_sta->active_siso_rate); 3159 lq_sta->max_mimo2_rate_idx = 3160 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate); 3161 3162 IWL_DEBUG_RATE(mvm, 3163 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n", 3164 lq_sta->active_legacy_rate, 3165 lq_sta->active_siso_rate, 3166 lq_sta->active_mimo2_rate, 3167 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable, 3168 lq_sta->bfer_capable); 3169 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n", 3170 lq_sta->max_legacy_rate_idx, 3171 lq_sta->max_siso_rate_idx, 3172 lq_sta->max_mimo2_rate_idx); 3173 3174 /* These values will be overridden later */ 3175 lq_sta->lq.single_stream_ant_msk = 3176 first_antenna(iwl_mvm_get_valid_tx_ant(mvm)); 3177 lq_sta->lq.dual_stream_ant_msk = ANT_AB; 3178 3179 /* as default allow aggregation for all tids */ 3180 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID; 3181 lq_sta->is_agg = 0; 3182 #ifdef CONFIG_IWLWIFI_DEBUGFS 3183 iwl_mvm_reset_frame_stats(mvm); 3184 #endif 3185 rs_initialize_lq(mvm, sta, lq_sta, band, init); 3186 } 3187 3188 static void rs_rate_update(void *mvm_r, 3189 struct ieee80211_supported_band *sband, 3190 struct cfg80211_chan_def *chandef, 3191 struct ieee80211_sta *sta, void *priv_sta, 3192 u32 changed) 3193 { 3194 u8 tid; 3195 struct iwl_op_mode *op_mode = 3196 (struct iwl_op_mode *)mvm_r; 3197 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 3198 3199 if (!iwl_mvm_sta_from_mac80211(sta)->vif) 3200 return; 3201 3202 /* Stop any ongoing aggregations as rs starts off assuming no agg */ 3203 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++) 3204 ieee80211_stop_tx_ba_session(sta, tid); 3205 3206 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false); 3207 } 3208 3209 #ifdef CONFIG_MAC80211_DEBUGFS 3210 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm, 3211 struct iwl_lq_cmd *lq_cmd, 3212 enum nl80211_band band, 3213 u32 ucode_rate) 3214 { 3215 struct rs_rate rate; 3216 int i; 3217 int num_rates = ARRAY_SIZE(lq_cmd->rs_table); 3218 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate); 3219 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; 3220 3221 for (i = 0; i < num_rates; i++) 3222 lq_cmd->rs_table[i] = ucode_rate_le32; 3223 3224 rs_rate_from_ucode_rate(ucode_rate, band, &rate); 3225 3226 if (is_mimo(&rate)) 3227 lq_cmd->mimo_delim = num_rates - 1; 3228 else 3229 lq_cmd->mimo_delim = 0; 3230 3231 lq_cmd->reduced_tpc = 0; 3232 3233 if (num_of_ant(ant) == 1) 3234 lq_cmd->single_stream_ant_msk = ant; 3235 3236 if (!mvm->trans->cfg->gen2) 3237 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF; 3238 else 3239 lq_cmd->agg_frame_cnt_limit = 3240 LINK_QUAL_AGG_FRAME_LIMIT_GEN2_DEF; 3241 } 3242 #endif /* CONFIG_MAC80211_DEBUGFS */ 3243 3244 static void rs_fill_rates_for_column(struct iwl_mvm *mvm, 3245 struct iwl_lq_sta *lq_sta, 3246 struct rs_rate *rate, 3247 __le32 *rs_table, int *rs_table_index, 3248 int num_rates, int num_retries, 3249 u8 valid_tx_ant, bool toggle_ant) 3250 { 3251 int i, j; 3252 __le32 ucode_rate; 3253 bool bottom_reached = false; 3254 int prev_rate_idx = rate->index; 3255 int end = LINK_QUAL_MAX_RETRY_NUM; 3256 int index = *rs_table_index; 3257 3258 for (i = 0; i < num_rates && index < end; i++) { 3259 for (j = 0; j < num_retries && index < end; j++, index++) { 3260 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm, 3261 rate)); 3262 rs_table[index] = ucode_rate; 3263 if (toggle_ant) 3264 rs_toggle_antenna(valid_tx_ant, rate); 3265 } 3266 3267 prev_rate_idx = rate->index; 3268 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate); 3269 if (bottom_reached && !is_legacy(rate)) 3270 break; 3271 } 3272 3273 if (!bottom_reached && !is_legacy(rate)) 3274 rate->index = prev_rate_idx; 3275 3276 *rs_table_index = index; 3277 } 3278 3279 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI 3280 * column the rate table should look like this: 3281 * 3282 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 3283 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 3284 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 3285 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 3286 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 3287 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 3288 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI 3289 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI 3290 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI 3291 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps 3292 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps 3293 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps 3294 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps 3295 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps 3296 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps 3297 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps 3298 */ 3299 static void rs_build_rates_table(struct iwl_mvm *mvm, 3300 struct ieee80211_sta *sta, 3301 struct iwl_lq_sta *lq_sta, 3302 const struct rs_rate *initial_rate) 3303 { 3304 struct rs_rate rate; 3305 int num_rates, num_retries, index = 0; 3306 u8 valid_tx_ant = 0; 3307 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3308 bool toggle_ant = false; 3309 u32 color; 3310 3311 memcpy(&rate, initial_rate, sizeof(rate)); 3312 3313 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 3314 3315 /* TODO: remove old API when min FW API hits 14 */ 3316 if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) && 3317 rs_stbc_allow(mvm, sta, lq_sta)) 3318 rate.stbc = true; 3319 3320 if (is_siso(&rate)) { 3321 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES; 3322 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3323 } else if (is_mimo(&rate)) { 3324 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES; 3325 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3326 } else { 3327 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES; 3328 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES; 3329 toggle_ant = true; 3330 } 3331 3332 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3333 num_rates, num_retries, valid_tx_ant, 3334 toggle_ant); 3335 3336 rs_get_lower_rate_down_column(lq_sta, &rate); 3337 3338 if (is_siso(&rate)) { 3339 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES; 3340 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES; 3341 lq_cmd->mimo_delim = index; 3342 } else if (is_legacy(&rate)) { 3343 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3344 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3345 } else { 3346 WARN_ON_ONCE(1); 3347 } 3348 3349 toggle_ant = true; 3350 3351 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3352 num_rates, num_retries, valid_tx_ant, 3353 toggle_ant); 3354 3355 rs_get_lower_rate_down_column(lq_sta, &rate); 3356 3357 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3358 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3359 3360 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3361 num_rates, num_retries, valid_tx_ant, 3362 toggle_ant); 3363 3364 /* update the color of the LQ command (as a counter at bits 1-3) */ 3365 color = LQ_FLAGS_COLOR_INC(LQ_FLAG_COLOR_GET(lq_cmd->flags)); 3366 lq_cmd->flags = LQ_FLAG_COLOR_SET(lq_cmd->flags, color); 3367 } 3368 3369 struct rs_bfer_active_iter_data { 3370 struct ieee80211_sta *exclude_sta; 3371 struct iwl_mvm_sta *bfer_mvmsta; 3372 }; 3373 3374 static void rs_bfer_active_iter(void *_data, 3375 struct ieee80211_sta *sta) 3376 { 3377 struct rs_bfer_active_iter_data *data = _data; 3378 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3379 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq; 3380 u32 ss_params = le32_to_cpu(lq_cmd->ss_params); 3381 3382 if (sta == data->exclude_sta) 3383 return; 3384 3385 /* The current sta has BFER allowed */ 3386 if (ss_params & LQ_SS_BFER_ALLOWED) { 3387 WARN_ON_ONCE(data->bfer_mvmsta != NULL); 3388 3389 data->bfer_mvmsta = mvmsta; 3390 } 3391 } 3392 3393 static int rs_bfer_priority(struct iwl_mvm_sta *sta) 3394 { 3395 int prio = -1; 3396 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif); 3397 3398 switch (viftype) { 3399 case NL80211_IFTYPE_AP: 3400 case NL80211_IFTYPE_P2P_GO: 3401 prio = 3; 3402 break; 3403 case NL80211_IFTYPE_P2P_CLIENT: 3404 prio = 2; 3405 break; 3406 case NL80211_IFTYPE_STATION: 3407 prio = 1; 3408 break; 3409 default: 3410 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id); 3411 prio = -1; 3412 } 3413 3414 return prio; 3415 } 3416 3417 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */ 3418 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1, 3419 struct iwl_mvm_sta *sta2) 3420 { 3421 int prio1 = rs_bfer_priority(sta1); 3422 int prio2 = rs_bfer_priority(sta2); 3423 3424 if (prio1 > prio2) 3425 return 1; 3426 if (prio1 < prio2) 3427 return -1; 3428 return 0; 3429 } 3430 3431 static void rs_set_lq_ss_params(struct iwl_mvm *mvm, 3432 struct ieee80211_sta *sta, 3433 struct iwl_lq_sta *lq_sta, 3434 const struct rs_rate *initial_rate) 3435 { 3436 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3437 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3438 struct rs_bfer_active_iter_data data = { 3439 .exclude_sta = sta, 3440 .bfer_mvmsta = NULL, 3441 }; 3442 struct iwl_mvm_sta *bfer_mvmsta = NULL; 3443 u32 ss_params = LQ_SS_PARAMS_VALID; 3444 3445 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 3446 goto out; 3447 3448 #ifdef CONFIG_MAC80211_DEBUGFS 3449 /* Check if forcing the decision is configured. 3450 * Note that SISO is forced by not allowing STBC or BFER 3451 */ 3452 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC) 3453 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE); 3454 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER) 3455 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE); 3456 3457 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) { 3458 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n", 3459 lq_sta->pers.ss_force); 3460 goto out; 3461 } 3462 #endif 3463 3464 if (lq_sta->stbc_capable) 3465 ss_params |= LQ_SS_STBC_1SS_ALLOWED; 3466 3467 if (!lq_sta->bfer_capable) 3468 goto out; 3469 3470 ieee80211_iterate_stations_atomic(mvm->hw, 3471 rs_bfer_active_iter, 3472 &data); 3473 bfer_mvmsta = data.bfer_mvmsta; 3474 3475 /* This code is safe as it doesn't run concurrently for different 3476 * stations. This is guaranteed by the fact that calls to 3477 * ieee80211_tx_status wouldn't run concurrently for a single HW. 3478 */ 3479 if (!bfer_mvmsta) { 3480 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n"); 3481 3482 ss_params |= LQ_SS_BFER_ALLOWED; 3483 goto out; 3484 } 3485 3486 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n", 3487 bfer_mvmsta->sta_id); 3488 3489 /* Disallow BFER on another STA if active and we're a higher priority */ 3490 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) { 3491 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq; 3492 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params); 3493 3494 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED; 3495 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params); 3496 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false); 3497 3498 ss_params |= LQ_SS_BFER_ALLOWED; 3499 IWL_DEBUG_RATE(mvm, 3500 "Lower priority BFER sta found (%d). Switch BFER\n", 3501 bfer_mvmsta->sta_id); 3502 } 3503 out: 3504 lq_cmd->ss_params = cpu_to_le32(ss_params); 3505 } 3506 3507 static void rs_fill_lq_cmd(struct iwl_mvm *mvm, 3508 struct ieee80211_sta *sta, 3509 struct iwl_lq_sta *lq_sta, 3510 const struct rs_rate *initial_rate) 3511 { 3512 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3513 struct iwl_mvm_sta *mvmsta; 3514 struct iwl_mvm_vif *mvmvif; 3515 3516 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START; 3517 lq_cmd->agg_time_limit = 3518 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT); 3519 3520 #ifdef CONFIG_MAC80211_DEBUGFS 3521 if (lq_sta->pers.dbg_fixed_rate) { 3522 rs_build_rates_table_from_fixed(mvm, lq_cmd, 3523 lq_sta->band, 3524 lq_sta->pers.dbg_fixed_rate); 3525 return; 3526 } 3527 #endif 3528 if (WARN_ON_ONCE(!sta || !initial_rate)) 3529 return; 3530 3531 rs_build_rates_table(mvm, sta, lq_sta, initial_rate); 3532 3533 if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS)) 3534 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate); 3535 3536 mvmsta = iwl_mvm_sta_from_mac80211(sta); 3537 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif); 3538 3539 if (num_of_ant(initial_rate->ant) == 1) 3540 lq_cmd->single_stream_ant_msk = initial_rate->ant; 3541 3542 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize; 3543 3544 /* 3545 * In case of low latency, tell the firmware to leave a frame in the 3546 * Tx Fifo so that it can start a transaction in the same TxOP. This 3547 * basically allows the firmware to send bursts. 3548 */ 3549 if (iwl_mvm_vif_low_latency(mvmvif)) 3550 lq_cmd->agg_frame_cnt_limit--; 3551 3552 if (mvmsta->vif->p2p) 3553 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK; 3554 3555 lq_cmd->agg_time_limit = 3556 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta)); 3557 } 3558 3559 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) 3560 { 3561 return hw->priv; 3562 } 3563 /* rate scale requires free function to be implemented */ 3564 static void rs_free(void *mvm_rate) 3565 { 3566 return; 3567 } 3568 3569 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, 3570 void *mvm_sta) 3571 { 3572 struct iwl_op_mode *op_mode __maybe_unused = mvm_r; 3573 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 3574 3575 IWL_DEBUG_RATE(mvm, "enter\n"); 3576 IWL_DEBUG_RATE(mvm, "leave\n"); 3577 } 3578 3579 #ifdef CONFIG_MAC80211_DEBUGFS 3580 int rs_pretty_print_rate(char *buf, const u32 rate) 3581 { 3582 3583 char *type, *bw; 3584 u8 mcs = 0, nss = 0; 3585 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; 3586 3587 if (!(rate & RATE_MCS_HT_MSK) && 3588 !(rate & RATE_MCS_VHT_MSK)) { 3589 int index = iwl_hwrate_to_plcp_idx(rate); 3590 3591 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n", 3592 rs_pretty_ant(ant), 3593 index == IWL_RATE_INVALID ? "BAD" : 3594 iwl_rate_mcs[index].mbps); 3595 } 3596 3597 if (rate & RATE_MCS_VHT_MSK) { 3598 type = "VHT"; 3599 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK; 3600 nss = ((rate & RATE_VHT_MCS_NSS_MSK) 3601 >> RATE_VHT_MCS_NSS_POS) + 1; 3602 } else if (rate & RATE_MCS_HT_MSK) { 3603 type = "HT"; 3604 mcs = rate & RATE_HT_MCS_INDEX_MSK; 3605 nss = ((rate & RATE_HT_MCS_NSS_MSK) 3606 >> RATE_HT_MCS_NSS_POS) + 1; 3607 } else { 3608 type = "Unknown"; /* shouldn't happen */ 3609 } 3610 3611 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { 3612 case RATE_MCS_CHAN_WIDTH_20: 3613 bw = "20Mhz"; 3614 break; 3615 case RATE_MCS_CHAN_WIDTH_40: 3616 bw = "40Mhz"; 3617 break; 3618 case RATE_MCS_CHAN_WIDTH_80: 3619 bw = "80Mhz"; 3620 break; 3621 case RATE_MCS_CHAN_WIDTH_160: 3622 bw = "160Mhz"; 3623 break; 3624 default: 3625 bw = "BAD BW"; 3626 } 3627 3628 return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s\n", 3629 type, rs_pretty_ant(ant), bw, mcs, nss, 3630 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ", 3631 (rate & RATE_MCS_STBC_MSK) ? "STBC " : "", 3632 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "", 3633 (rate & RATE_MCS_BF_MSK) ? "BF " : ""); 3634 } 3635 3636 /** 3637 * Program the device to use fixed rate for frame transmit 3638 * This is for debugging/testing only 3639 * once the device start use fixed rate, we need to reload the module 3640 * to being back the normal operation. 3641 */ 3642 static void rs_program_fix_rate(struct iwl_mvm *mvm, 3643 struct iwl_lq_sta *lq_sta) 3644 { 3645 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */ 3646 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3647 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3648 3649 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n", 3650 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate); 3651 3652 if (lq_sta->pers.dbg_fixed_rate) { 3653 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL); 3654 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false); 3655 } 3656 } 3657 3658 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file, 3659 const char __user *user_buf, size_t count, loff_t *ppos) 3660 { 3661 struct iwl_lq_sta *lq_sta = file->private_data; 3662 struct iwl_mvm *mvm; 3663 char buf[64]; 3664 size_t buf_size; 3665 u32 parsed_rate; 3666 3667 mvm = lq_sta->pers.drv; 3668 memset(buf, 0, sizeof(buf)); 3669 buf_size = min(count, sizeof(buf) - 1); 3670 if (copy_from_user(buf, user_buf, buf_size)) 3671 return -EFAULT; 3672 3673 if (sscanf(buf, "%x", &parsed_rate) == 1) 3674 lq_sta->pers.dbg_fixed_rate = parsed_rate; 3675 else 3676 lq_sta->pers.dbg_fixed_rate = 0; 3677 3678 rs_program_fix_rate(mvm, lq_sta); 3679 3680 return count; 3681 } 3682 3683 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file, 3684 char __user *user_buf, size_t count, loff_t *ppos) 3685 { 3686 char *buff; 3687 int desc = 0; 3688 int i = 0; 3689 ssize_t ret; 3690 3691 struct iwl_lq_sta *lq_sta = file->private_data; 3692 struct iwl_mvm_sta *mvmsta = 3693 container_of(lq_sta, struct iwl_mvm_sta, lq_sta); 3694 struct iwl_mvm *mvm; 3695 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 3696 struct rs_rate *rate = &tbl->rate; 3697 u32 ss_params; 3698 3699 mvm = lq_sta->pers.drv; 3700 buff = kmalloc(2048, GFP_KERNEL); 3701 if (!buff) 3702 return -ENOMEM; 3703 3704 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id); 3705 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n", 3706 lq_sta->total_failed, lq_sta->total_success, 3707 lq_sta->active_legacy_rate); 3708 desc += sprintf(buff+desc, "fixed rate 0x%X\n", 3709 lq_sta->pers.dbg_fixed_rate); 3710 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n", 3711 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "", 3712 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "", 3713 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : ""); 3714 desc += sprintf(buff+desc, "lq type %s\n", 3715 (is_legacy(rate)) ? "legacy" : 3716 is_vht(rate) ? "VHT" : "HT"); 3717 if (!is_legacy(rate)) { 3718 desc += sprintf(buff + desc, " %s", 3719 (is_siso(rate)) ? "SISO" : "MIMO2"); 3720 desc += sprintf(buff + desc, " %s", 3721 (is_ht20(rate)) ? "20MHz" : 3722 (is_ht40(rate)) ? "40MHz" : 3723 (is_ht80(rate)) ? "80MHz" : 3724 (is_ht160(rate)) ? "160MHz" : "BAD BW"); 3725 desc += sprintf(buff + desc, " %s %s %s %s\n", 3726 (rate->sgi) ? "SGI" : "NGI", 3727 (rate->ldpc) ? "LDPC" : "BCC", 3728 (lq_sta->is_agg) ? "AGG on" : "", 3729 (mvmsta->tlc_amsdu) ? "AMSDU on" : ""); 3730 } 3731 desc += sprintf(buff+desc, "last tx rate=0x%X\n", 3732 lq_sta->last_rate_n_flags); 3733 desc += sprintf(buff+desc, 3734 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n", 3735 lq_sta->lq.flags, 3736 lq_sta->lq.mimo_delim, 3737 lq_sta->lq.single_stream_ant_msk, 3738 lq_sta->lq.dual_stream_ant_msk); 3739 3740 desc += sprintf(buff+desc, 3741 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n", 3742 le16_to_cpu(lq_sta->lq.agg_time_limit), 3743 lq_sta->lq.agg_disable_start_th, 3744 lq_sta->lq.agg_frame_cnt_limit); 3745 3746 desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc); 3747 ss_params = le32_to_cpu(lq_sta->lq.ss_params); 3748 desc += sprintf(buff+desc, "single stream params: %s%s%s%s\n", 3749 (ss_params & LQ_SS_PARAMS_VALID) ? 3750 "VALID" : "INVALID", 3751 (ss_params & LQ_SS_BFER_ALLOWED) ? 3752 ", BFER" : "", 3753 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ? 3754 ", STBC" : "", 3755 (ss_params & LQ_SS_FORCE) ? 3756 ", FORCE" : ""); 3757 desc += sprintf(buff+desc, 3758 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n", 3759 lq_sta->lq.initial_rate_index[0], 3760 lq_sta->lq.initial_rate_index[1], 3761 lq_sta->lq.initial_rate_index[2], 3762 lq_sta->lq.initial_rate_index[3]); 3763 3764 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) { 3765 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]); 3766 3767 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r); 3768 desc += rs_pretty_print_rate(buff+desc, r); 3769 } 3770 3771 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3772 kfree(buff); 3773 return ret; 3774 } 3775 3776 static const struct file_operations rs_sta_dbgfs_scale_table_ops = { 3777 .write = rs_sta_dbgfs_scale_table_write, 3778 .read = rs_sta_dbgfs_scale_table_read, 3779 .open = simple_open, 3780 .llseek = default_llseek, 3781 }; 3782 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file, 3783 char __user *user_buf, size_t count, loff_t *ppos) 3784 { 3785 char *buff; 3786 int desc = 0; 3787 int i, j; 3788 ssize_t ret; 3789 struct iwl_scale_tbl_info *tbl; 3790 struct rs_rate *rate; 3791 struct iwl_lq_sta *lq_sta = file->private_data; 3792 3793 buff = kmalloc(1024, GFP_KERNEL); 3794 if (!buff) 3795 return -ENOMEM; 3796 3797 for (i = 0; i < LQ_SIZE; i++) { 3798 tbl = &(lq_sta->lq_info[i]); 3799 rate = &tbl->rate; 3800 desc += sprintf(buff+desc, 3801 "%s type=%d SGI=%d BW=%s DUP=0\n" 3802 "index=%d\n", 3803 lq_sta->active_tbl == i ? "*" : "x", 3804 rate->type, 3805 rate->sgi, 3806 is_ht20(rate) ? "20MHz" : 3807 is_ht40(rate) ? "40MHz" : 3808 is_ht80(rate) ? "80MHz" : 3809 is_ht160(rate) ? "160MHz" : "ERR", 3810 rate->index); 3811 for (j = 0; j < IWL_RATE_COUNT; j++) { 3812 desc += sprintf(buff+desc, 3813 "counter=%d success=%d %%=%d\n", 3814 tbl->win[j].counter, 3815 tbl->win[j].success_counter, 3816 tbl->win[j].success_ratio); 3817 } 3818 } 3819 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3820 kfree(buff); 3821 return ret; 3822 } 3823 3824 static const struct file_operations rs_sta_dbgfs_stats_table_ops = { 3825 .read = rs_sta_dbgfs_stats_table_read, 3826 .open = simple_open, 3827 .llseek = default_llseek, 3828 }; 3829 3830 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file, 3831 char __user *user_buf, 3832 size_t count, loff_t *ppos) 3833 { 3834 static const char * const column_name[] = { 3835 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A", 3836 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B", 3837 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A", 3838 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B", 3839 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI", 3840 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI", 3841 [RS_COLUMN_MIMO2] = "MIMO2", 3842 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI", 3843 }; 3844 3845 static const char * const rate_name[] = { 3846 [IWL_RATE_1M_INDEX] = "1M", 3847 [IWL_RATE_2M_INDEX] = "2M", 3848 [IWL_RATE_5M_INDEX] = "5.5M", 3849 [IWL_RATE_11M_INDEX] = "11M", 3850 [IWL_RATE_6M_INDEX] = "6M|MCS0", 3851 [IWL_RATE_9M_INDEX] = "9M", 3852 [IWL_RATE_12M_INDEX] = "12M|MCS1", 3853 [IWL_RATE_18M_INDEX] = "18M|MCS2", 3854 [IWL_RATE_24M_INDEX] = "24M|MCS3", 3855 [IWL_RATE_36M_INDEX] = "36M|MCS4", 3856 [IWL_RATE_48M_INDEX] = "48M|MCS5", 3857 [IWL_RATE_54M_INDEX] = "54M|MCS6", 3858 [IWL_RATE_MCS_7_INDEX] = "MCS7", 3859 [IWL_RATE_MCS_8_INDEX] = "MCS8", 3860 [IWL_RATE_MCS_9_INDEX] = "MCS9", 3861 }; 3862 3863 char *buff, *pos, *endpos; 3864 int col, rate; 3865 ssize_t ret; 3866 struct iwl_lq_sta *lq_sta = file->private_data; 3867 struct rs_rate_stats *stats; 3868 static const size_t bufsz = 1024; 3869 3870 buff = kmalloc(bufsz, GFP_KERNEL); 3871 if (!buff) 3872 return -ENOMEM; 3873 3874 pos = buff; 3875 endpos = pos + bufsz; 3876 3877 pos += scnprintf(pos, endpos - pos, "COLUMN,"); 3878 for (rate = 0; rate < IWL_RATE_COUNT; rate++) 3879 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]); 3880 pos += scnprintf(pos, endpos - pos, "\n"); 3881 3882 for (col = 0; col < RS_COLUMN_COUNT; col++) { 3883 pos += scnprintf(pos, endpos - pos, 3884 "%s,", column_name[col]); 3885 3886 for (rate = 0; rate < IWL_RATE_COUNT; rate++) { 3887 stats = &(lq_sta->pers.tx_stats[col][rate]); 3888 pos += scnprintf(pos, endpos - pos, 3889 "%llu/%llu,", 3890 stats->success, 3891 stats->total); 3892 } 3893 pos += scnprintf(pos, endpos - pos, "\n"); 3894 } 3895 3896 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff); 3897 kfree(buff); 3898 return ret; 3899 } 3900 3901 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file, 3902 const char __user *user_buf, 3903 size_t count, loff_t *ppos) 3904 { 3905 struct iwl_lq_sta *lq_sta = file->private_data; 3906 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats)); 3907 3908 return count; 3909 } 3910 3911 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = { 3912 .read = rs_sta_dbgfs_drv_tx_stats_read, 3913 .write = rs_sta_dbgfs_drv_tx_stats_write, 3914 .open = simple_open, 3915 .llseek = default_llseek, 3916 }; 3917 3918 static ssize_t iwl_dbgfs_ss_force_read(struct file *file, 3919 char __user *user_buf, 3920 size_t count, loff_t *ppos) 3921 { 3922 struct iwl_lq_sta *lq_sta = file->private_data; 3923 char buf[12]; 3924 int bufsz = sizeof(buf); 3925 int pos = 0; 3926 static const char * const ss_force_name[] = { 3927 [RS_SS_FORCE_NONE] = "none", 3928 [RS_SS_FORCE_STBC] = "stbc", 3929 [RS_SS_FORCE_BFER] = "bfer", 3930 [RS_SS_FORCE_SISO] = "siso", 3931 }; 3932 3933 pos += scnprintf(buf+pos, bufsz-pos, "%s\n", 3934 ss_force_name[lq_sta->pers.ss_force]); 3935 return simple_read_from_buffer(user_buf, count, ppos, buf, pos); 3936 } 3937 3938 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf, 3939 size_t count, loff_t *ppos) 3940 { 3941 struct iwl_mvm *mvm = lq_sta->pers.drv; 3942 int ret = 0; 3943 3944 if (!strncmp("none", buf, 4)) { 3945 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 3946 } else if (!strncmp("siso", buf, 4)) { 3947 lq_sta->pers.ss_force = RS_SS_FORCE_SISO; 3948 } else if (!strncmp("stbc", buf, 4)) { 3949 if (lq_sta->stbc_capable) { 3950 lq_sta->pers.ss_force = RS_SS_FORCE_STBC; 3951 } else { 3952 IWL_ERR(mvm, 3953 "can't force STBC. peer doesn't support\n"); 3954 ret = -EINVAL; 3955 } 3956 } else if (!strncmp("bfer", buf, 4)) { 3957 if (lq_sta->bfer_capable) { 3958 lq_sta->pers.ss_force = RS_SS_FORCE_BFER; 3959 } else { 3960 IWL_ERR(mvm, 3961 "can't force BFER. peer doesn't support\n"); 3962 ret = -EINVAL; 3963 } 3964 } else { 3965 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n"); 3966 ret = -EINVAL; 3967 } 3968 return ret ?: count; 3969 } 3970 3971 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \ 3972 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta) 3973 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \ 3974 if (!debugfs_create_file(#name, mode, parent, lq_sta, \ 3975 &iwl_dbgfs_##name##_ops)) \ 3976 goto err; \ 3977 } while (0) 3978 3979 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32); 3980 3981 static void rs_add_debugfs(void *mvm, void *priv_sta, struct dentry *dir) 3982 { 3983 struct iwl_lq_sta *lq_sta = priv_sta; 3984 struct iwl_mvm_sta *mvmsta; 3985 3986 mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta); 3987 3988 if (!mvmsta->vif) 3989 return; 3990 3991 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir, 3992 lq_sta, &rs_sta_dbgfs_scale_table_ops); 3993 debugfs_create_file("rate_stats_table", S_IRUSR, dir, 3994 lq_sta, &rs_sta_dbgfs_stats_table_ops); 3995 debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir, 3996 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops); 3997 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir, 3998 &lq_sta->tx_agg_tid_en); 3999 debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir, 4000 &lq_sta->pers.dbg_fixed_txp_reduction); 4001 4002 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR); 4003 return; 4004 err: 4005 IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n"); 4006 } 4007 4008 static void rs_remove_debugfs(void *mvm, void *mvm_sta) 4009 { 4010 } 4011 #endif 4012 4013 /* 4014 * Initialization of rate scaling information is done by driver after 4015 * the station is added. Since mac80211 calls this function before a 4016 * station is added we ignore it. 4017 */ 4018 static void rs_rate_init_stub(void *mvm_r, 4019 struct ieee80211_supported_band *sband, 4020 struct cfg80211_chan_def *chandef, 4021 struct ieee80211_sta *sta, void *mvm_sta) 4022 { 4023 } 4024 4025 static const struct rate_control_ops rs_mvm_ops = { 4026 .name = RS_NAME, 4027 .tx_status = rs_mac80211_tx_status, 4028 .get_rate = rs_get_rate, 4029 .rate_init = rs_rate_init_stub, 4030 .alloc = rs_alloc, 4031 .free = rs_free, 4032 .alloc_sta = rs_alloc_sta, 4033 .free_sta = rs_free_sta, 4034 .rate_update = rs_rate_update, 4035 #ifdef CONFIG_MAC80211_DEBUGFS 4036 .add_sta_debugfs = rs_add_debugfs, 4037 .remove_sta_debugfs = rs_remove_debugfs, 4038 #endif 4039 }; 4040 4041 int iwl_mvm_rate_control_register(void) 4042 { 4043 return ieee80211_rate_control_register(&rs_mvm_ops); 4044 } 4045 4046 void iwl_mvm_rate_control_unregister(void) 4047 { 4048 ieee80211_rate_control_unregister(&rs_mvm_ops); 4049 } 4050 4051 /** 4052 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable 4053 * Tx protection, according to this request and previous requests, 4054 * and send the LQ command. 4055 * @mvmsta: The station 4056 * @enable: Enable Tx protection? 4057 */ 4058 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 4059 bool enable) 4060 { 4061 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq; 4062 4063 lockdep_assert_held(&mvm->mutex); 4064 4065 if (enable) { 4066 if (mvmsta->tx_protection == 0) 4067 lq->flags |= LQ_FLAG_USE_RTS_MSK; 4068 mvmsta->tx_protection++; 4069 } else { 4070 mvmsta->tx_protection--; 4071 if (mvmsta->tx_protection == 0) 4072 lq->flags &= ~LQ_FLAG_USE_RTS_MSK; 4073 } 4074 4075 return iwl_mvm_send_lq_cmd(mvm, lq, false); 4076 } 4077