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); 625 626 /* start BA session until the peer sends del BA */ 627 ret = ieee80211_start_tx_ba_session(sta, tid, 0); 628 if (ret == -EAGAIN) { 629 /* 630 * driver and mac80211 is out of sync 631 * this might be cause by reloading firmware 632 * stop the tx ba session here 633 */ 634 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n", 635 tid); 636 ieee80211_stop_tx_ba_session(sta, tid); 637 } 638 return ret; 639 } 640 641 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 642 u8 tid, struct iwl_lq_sta *lq_sta, 643 struct ieee80211_sta *sta) 644 { 645 struct iwl_mvm_tid_data *tid_data; 646 647 /* 648 * In AP mode, tid can be equal to IWL_MAX_TID_COUNT 649 * when the frame is not QoS 650 */ 651 if (WARN_ON_ONCE(tid > IWL_MAX_TID_COUNT)) { 652 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n", 653 tid, IWL_MAX_TID_COUNT); 654 return; 655 } else if (tid == IWL_MAX_TID_COUNT) { 656 return; 657 } 658 659 tid_data = &mvmsta->tid_data[tid]; 660 if ((tid_data->state == IWL_AGG_OFF) && 661 (lq_sta->tx_agg_tid_en & BIT(tid)) && 662 (tid_data->tx_count_last >= IWL_MVM_RS_AGG_START_THRESHOLD)) { 663 IWL_DEBUG_RATE(mvm, "try to aggregate tid %d\n", tid); 664 rs_tl_turn_on_agg_for_tid(mvm, lq_sta, tid, sta); 665 } 666 } 667 668 static inline int get_num_of_ant_from_rate(u32 rate_n_flags) 669 { 670 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) + 671 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) + 672 !!(rate_n_flags & RATE_MCS_ANT_C_MSK); 673 } 674 675 /* 676 * Static function to get the expected throughput from an iwl_scale_tbl_info 677 * that wraps a NULL pointer check 678 */ 679 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index) 680 { 681 if (tbl->expected_tpt) 682 return tbl->expected_tpt[rs_index]; 683 return 0; 684 } 685 686 /** 687 * rs_collect_tx_data - Update the success/failure sliding window 688 * 689 * We keep a sliding window of the last 62 packets transmitted 690 * at this rate. window->data contains the bitmask of successful 691 * packets. 692 */ 693 static int _rs_collect_tx_data(struct iwl_mvm *mvm, 694 struct iwl_scale_tbl_info *tbl, 695 int scale_index, int attempts, int successes, 696 struct iwl_rate_scale_data *window) 697 { 698 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1)); 699 s32 fail_count, tpt; 700 701 /* Get expected throughput */ 702 tpt = get_expected_tpt(tbl, scale_index); 703 704 /* 705 * Keep track of only the latest 62 tx frame attempts in this rate's 706 * history window; anything older isn't really relevant any more. 707 * If we have filled up the sliding window, drop the oldest attempt; 708 * if the oldest attempt (highest bit in bitmap) shows "success", 709 * subtract "1" from the success counter (this is the main reason 710 * we keep these bitmaps!). 711 */ 712 while (attempts > 0) { 713 if (window->counter >= IWL_RATE_MAX_WINDOW) { 714 /* remove earliest */ 715 window->counter = IWL_RATE_MAX_WINDOW - 1; 716 717 if (window->data & mask) { 718 window->data &= ~mask; 719 window->success_counter--; 720 } 721 } 722 723 /* Increment frames-attempted counter */ 724 window->counter++; 725 726 /* Shift bitmap by one frame to throw away oldest history */ 727 window->data <<= 1; 728 729 /* Mark the most recent #successes attempts as successful */ 730 if (successes > 0) { 731 window->success_counter++; 732 window->data |= 0x1; 733 successes--; 734 } 735 736 attempts--; 737 } 738 739 /* Calculate current success ratio, avoid divide-by-0! */ 740 if (window->counter > 0) 741 window->success_ratio = 128 * (100 * window->success_counter) 742 / window->counter; 743 else 744 window->success_ratio = IWL_INVALID_VALUE; 745 746 fail_count = window->counter - window->success_counter; 747 748 /* Calculate average throughput, if we have enough history. */ 749 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) || 750 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) 751 window->average_tpt = (window->success_ratio * tpt + 64) / 128; 752 else 753 window->average_tpt = IWL_INVALID_VALUE; 754 755 return 0; 756 } 757 758 static int rs_collect_tpc_data(struct iwl_mvm *mvm, 759 struct iwl_lq_sta *lq_sta, 760 struct iwl_scale_tbl_info *tbl, 761 int scale_index, int attempts, int successes, 762 u8 reduced_txp) 763 { 764 struct iwl_rate_scale_data *window = NULL; 765 766 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION)) 767 return -EINVAL; 768 769 window = &tbl->tpc_win[reduced_txp]; 770 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes, 771 window); 772 } 773 774 static void rs_update_tid_tpt_stats(struct iwl_mvm *mvm, 775 struct iwl_mvm_sta *mvmsta, 776 u8 tid, int successes) 777 { 778 struct iwl_mvm_tid_data *tid_data; 779 780 if (tid >= IWL_MAX_TID_COUNT) 781 return; 782 783 tid_data = &mvmsta->tid_data[tid]; 784 785 /* 786 * Measure if there're enough successful transmits per second. 787 * These statistics are used only to decide if we can start a 788 * BA session, so it should be updated only when A-MPDU is 789 * off. 790 */ 791 if (tid_data->state != IWL_AGG_OFF) 792 return; 793 794 if (time_is_before_jiffies(tid_data->tpt_meas_start + HZ) || 795 (tid_data->tx_count >= IWL_MVM_RS_AGG_START_THRESHOLD)) { 796 tid_data->tx_count_last = tid_data->tx_count; 797 tid_data->tx_count = 0; 798 tid_data->tpt_meas_start = jiffies; 799 } else { 800 tid_data->tx_count += successes; 801 } 802 } 803 804 static int rs_collect_tlc_data(struct iwl_mvm *mvm, 805 struct iwl_mvm_sta *mvmsta, u8 tid, 806 struct iwl_scale_tbl_info *tbl, 807 int scale_index, int attempts, int successes) 808 { 809 struct iwl_rate_scale_data *window = NULL; 810 811 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT) 812 return -EINVAL; 813 814 if (tbl->column != RS_COLUMN_INVALID) { 815 struct lq_sta_pers *pers = &mvmsta->lq_sta.pers; 816 817 pers->tx_stats[tbl->column][scale_index].total += attempts; 818 pers->tx_stats[tbl->column][scale_index].success += successes; 819 } 820 821 rs_update_tid_tpt_stats(mvm, mvmsta, tid, successes); 822 823 /* Select window for current tx bit rate */ 824 window = &(tbl->win[scale_index]); 825 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes, 826 window); 827 } 828 829 /* Convert rs_rate object into ucode rate bitmask */ 830 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm, 831 struct rs_rate *rate) 832 { 833 u32 ucode_rate = 0; 834 int index = rate->index; 835 836 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) & 837 RATE_MCS_ANT_ABC_MSK); 838 839 if (is_legacy(rate)) { 840 ucode_rate |= iwl_rates[index].plcp; 841 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE) 842 ucode_rate |= RATE_MCS_CCK_MSK; 843 return ucode_rate; 844 } 845 846 if (is_ht(rate)) { 847 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) { 848 IWL_ERR(mvm, "Invalid HT rate index %d\n", index); 849 index = IWL_LAST_HT_RATE; 850 } 851 ucode_rate |= RATE_MCS_HT_MSK; 852 853 if (is_ht_siso(rate)) 854 ucode_rate |= iwl_rates[index].plcp_ht_siso; 855 else if (is_ht_mimo2(rate)) 856 ucode_rate |= iwl_rates[index].plcp_ht_mimo2; 857 else 858 WARN_ON_ONCE(1); 859 } else if (is_vht(rate)) { 860 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) { 861 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index); 862 index = IWL_LAST_VHT_RATE; 863 } 864 ucode_rate |= RATE_MCS_VHT_MSK; 865 if (is_vht_siso(rate)) 866 ucode_rate |= iwl_rates[index].plcp_vht_siso; 867 else if (is_vht_mimo2(rate)) 868 ucode_rate |= iwl_rates[index].plcp_vht_mimo2; 869 else 870 WARN_ON_ONCE(1); 871 872 } else { 873 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type); 874 } 875 876 if (is_siso(rate) && rate->stbc) { 877 /* To enable STBC we need to set both a flag and ANT_AB */ 878 ucode_rate |= RATE_MCS_ANT_AB_MSK; 879 ucode_rate |= RATE_MCS_STBC_MSK; 880 } 881 882 ucode_rate |= rate->bw; 883 if (rate->sgi) 884 ucode_rate |= RATE_MCS_SGI_MSK; 885 if (rate->ldpc) 886 ucode_rate |= RATE_MCS_LDPC_MSK; 887 888 return ucode_rate; 889 } 890 891 /* Convert a ucode rate into an rs_rate object */ 892 static int rs_rate_from_ucode_rate(const u32 ucode_rate, 893 enum nl80211_band band, 894 struct rs_rate *rate) 895 { 896 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK; 897 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate); 898 u8 nss; 899 900 memset(rate, 0, sizeof(*rate)); 901 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate); 902 903 if (rate->index == IWL_RATE_INVALID) 904 return -EINVAL; 905 906 rate->ant = (ant_msk >> RATE_MCS_ANT_POS); 907 908 /* Legacy */ 909 if (!(ucode_rate & RATE_MCS_HT_MSK) && 910 !(ucode_rate & RATE_MCS_VHT_MSK)) { 911 if (num_of_ant == 1) { 912 if (band == NL80211_BAND_5GHZ) 913 rate->type = LQ_LEGACY_A; 914 else 915 rate->type = LQ_LEGACY_G; 916 } 917 918 return 0; 919 } 920 921 /* HT or VHT */ 922 if (ucode_rate & RATE_MCS_SGI_MSK) 923 rate->sgi = true; 924 if (ucode_rate & RATE_MCS_LDPC_MSK) 925 rate->ldpc = true; 926 if (ucode_rate & RATE_MCS_STBC_MSK) 927 rate->stbc = true; 928 if (ucode_rate & RATE_MCS_BF_MSK) 929 rate->bfer = true; 930 931 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK; 932 933 if (ucode_rate & RATE_MCS_HT_MSK) { 934 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >> 935 RATE_HT_MCS_NSS_POS) + 1; 936 937 if (nss == 1) { 938 rate->type = LQ_HT_SISO; 939 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 940 "stbc %d bfer %d", 941 rate->stbc, rate->bfer); 942 } else if (nss == 2) { 943 rate->type = LQ_HT_MIMO2; 944 WARN_ON_ONCE(num_of_ant != 2); 945 } else { 946 WARN_ON_ONCE(1); 947 } 948 } else if (ucode_rate & RATE_MCS_VHT_MSK) { 949 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >> 950 RATE_VHT_MCS_NSS_POS) + 1; 951 952 if (nss == 1) { 953 rate->type = LQ_VHT_SISO; 954 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 955 "stbc %d bfer %d", 956 rate->stbc, rate->bfer); 957 } else if (nss == 2) { 958 rate->type = LQ_VHT_MIMO2; 959 WARN_ON_ONCE(num_of_ant != 2); 960 } else { 961 WARN_ON_ONCE(1); 962 } 963 } 964 965 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 && 966 !is_vht(rate)); 967 968 return 0; 969 } 970 971 /* switch to another antenna/antennas and return 1 */ 972 /* if no other valid antenna found, return 0 */ 973 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate) 974 { 975 u8 new_ant_type; 976 977 if (!rate->ant || rate->ant > ANT_ABC) 978 return 0; 979 980 if (!rs_is_valid_ant(valid_ant, rate->ant)) 981 return 0; 982 983 new_ant_type = ant_toggle_lookup[rate->ant]; 984 985 while ((new_ant_type != rate->ant) && 986 !rs_is_valid_ant(valid_ant, new_ant_type)) 987 new_ant_type = ant_toggle_lookup[new_ant_type]; 988 989 if (new_ant_type == rate->ant) 990 return 0; 991 992 rate->ant = new_ant_type; 993 994 return 1; 995 } 996 997 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta, 998 struct rs_rate *rate) 999 { 1000 if (is_legacy(rate)) 1001 return lq_sta->active_legacy_rate; 1002 else if (is_siso(rate)) 1003 return lq_sta->active_siso_rate; 1004 else if (is_mimo2(rate)) 1005 return lq_sta->active_mimo2_rate; 1006 1007 WARN_ON_ONCE(1); 1008 return 0; 1009 } 1010 1011 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask, 1012 int rate_type) 1013 { 1014 u8 high = IWL_RATE_INVALID; 1015 u8 low = IWL_RATE_INVALID; 1016 1017 /* 802.11A or ht walks to the next literal adjacent rate in 1018 * the rate table */ 1019 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) { 1020 int i; 1021 u32 mask; 1022 1023 /* Find the previous rate that is in the rate mask */ 1024 i = index - 1; 1025 if (i >= 0) 1026 mask = BIT(i); 1027 for (; i >= 0; i--, mask >>= 1) { 1028 if (rate_mask & mask) { 1029 low = i; 1030 break; 1031 } 1032 } 1033 1034 /* Find the next rate that is in the rate mask */ 1035 i = index + 1; 1036 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) { 1037 if (rate_mask & mask) { 1038 high = i; 1039 break; 1040 } 1041 } 1042 1043 return (high << 8) | low; 1044 } 1045 1046 low = index; 1047 while (low != IWL_RATE_INVALID) { 1048 low = iwl_rates[low].prev_rs; 1049 if (low == IWL_RATE_INVALID) 1050 break; 1051 if (rate_mask & (1 << low)) 1052 break; 1053 } 1054 1055 high = index; 1056 while (high != IWL_RATE_INVALID) { 1057 high = iwl_rates[high].next_rs; 1058 if (high == IWL_RATE_INVALID) 1059 break; 1060 if (rate_mask & (1 << high)) 1061 break; 1062 } 1063 1064 return (high << 8) | low; 1065 } 1066 1067 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta, 1068 struct rs_rate *rate) 1069 { 1070 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate); 1071 } 1072 1073 /* Get the next supported lower rate in the current column. 1074 * Return true if bottom rate in the current column was reached 1075 */ 1076 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta, 1077 struct rs_rate *rate) 1078 { 1079 u8 low; 1080 u16 high_low; 1081 u16 rate_mask; 1082 struct iwl_mvm *mvm = lq_sta->pers.drv; 1083 1084 rate_mask = rs_get_supported_rates(lq_sta, rate); 1085 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask, 1086 rate->type); 1087 low = high_low & 0xff; 1088 1089 /* Bottom rate of column reached */ 1090 if (low == IWL_RATE_INVALID) 1091 return true; 1092 1093 rate->index = low; 1094 return false; 1095 } 1096 1097 /* Get the next rate to use following a column downgrade */ 1098 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta, 1099 struct rs_rate *rate) 1100 { 1101 struct iwl_mvm *mvm = lq_sta->pers.drv; 1102 1103 if (is_legacy(rate)) { 1104 /* No column to downgrade from Legacy */ 1105 return; 1106 } else if (is_siso(rate)) { 1107 /* Downgrade to Legacy if we were in SISO */ 1108 if (lq_sta->band == NL80211_BAND_5GHZ) 1109 rate->type = LQ_LEGACY_A; 1110 else 1111 rate->type = LQ_LEGACY_G; 1112 1113 rate->bw = RATE_MCS_CHAN_WIDTH_20; 1114 1115 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX || 1116 rate->index > IWL_RATE_MCS_9_INDEX); 1117 1118 rate->index = rs_ht_to_legacy[rate->index]; 1119 rate->ldpc = false; 1120 } else { 1121 /* Downgrade to SISO with same MCS if in MIMO */ 1122 rate->type = is_vht_mimo2(rate) ? 1123 LQ_VHT_SISO : LQ_HT_SISO; 1124 } 1125 1126 if (num_of_ant(rate->ant) > 1) 1127 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm)); 1128 1129 /* Relevant in both switching to SISO or Legacy */ 1130 rate->sgi = false; 1131 1132 if (!rs_rate_supported(lq_sta, rate)) 1133 rs_get_lower_rate_in_column(lq_sta, rate); 1134 } 1135 1136 /* Check if both rates share the same column */ 1137 static inline bool rs_rate_column_match(struct rs_rate *a, 1138 struct rs_rate *b) 1139 { 1140 bool ant_match; 1141 1142 if (a->stbc || a->bfer) 1143 ant_match = (b->ant == ANT_A || b->ant == ANT_B); 1144 else 1145 ant_match = (a->ant == b->ant); 1146 1147 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) 1148 && ant_match; 1149 } 1150 1151 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate) 1152 { 1153 if (is_legacy(rate)) { 1154 if (rate->ant == ANT_A) 1155 return RS_COLUMN_LEGACY_ANT_A; 1156 1157 if (rate->ant == ANT_B) 1158 return RS_COLUMN_LEGACY_ANT_B; 1159 1160 goto err; 1161 } 1162 1163 if (is_siso(rate)) { 1164 if (rate->ant == ANT_A || rate->stbc || rate->bfer) 1165 return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI : 1166 RS_COLUMN_SISO_ANT_A; 1167 1168 if (rate->ant == ANT_B) 1169 return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI : 1170 RS_COLUMN_SISO_ANT_B; 1171 1172 goto err; 1173 } 1174 1175 if (is_mimo(rate)) 1176 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2; 1177 1178 err: 1179 return RS_COLUMN_INVALID; 1180 } 1181 1182 static u8 rs_get_tid(struct ieee80211_hdr *hdr) 1183 { 1184 u8 tid = IWL_MAX_TID_COUNT; 1185 1186 if (ieee80211_is_data_qos(hdr->frame_control)) { 1187 u8 *qc = ieee80211_get_qos_ctl(hdr); 1188 tid = qc[0] & 0xf; 1189 } 1190 1191 if (unlikely(tid > IWL_MAX_TID_COUNT)) 1192 tid = IWL_MAX_TID_COUNT; 1193 1194 return tid; 1195 } 1196 1197 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1198 int tid, struct ieee80211_tx_info *info, bool ndp) 1199 { 1200 int legacy_success; 1201 int retries; 1202 int i; 1203 struct iwl_lq_cmd *table; 1204 u32 lq_hwrate; 1205 struct rs_rate lq_rate, tx_resp_rate; 1206 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl; 1207 u32 tlc_info = (uintptr_t)info->status.status_driver_data[0]; 1208 u8 reduced_txp = tlc_info & RS_DRV_DATA_TXP_MSK; 1209 u8 lq_color = RS_DRV_DATA_LQ_COLOR_GET(tlc_info); 1210 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1]; 1211 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 1212 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta; 1213 1214 /* Treat uninitialized rate scaling data same as non-existing. */ 1215 if (!lq_sta) { 1216 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n"); 1217 return; 1218 } else if (!lq_sta->pers.drv) { 1219 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n"); 1220 return; 1221 } 1222 1223 /* This packet was aggregated but doesn't carry status info */ 1224 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 1225 !(info->flags & IEEE80211_TX_STAT_AMPDU)) 1226 return; 1227 1228 rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate); 1229 1230 #ifdef CONFIG_MAC80211_DEBUGFS 1231 /* Disable last tx check if we are debugging with fixed rate but 1232 * update tx stats */ 1233 if (lq_sta->pers.dbg_fixed_rate) { 1234 int index = tx_resp_rate.index; 1235 enum rs_column column; 1236 int attempts, success; 1237 1238 column = rs_get_column_from_rate(&tx_resp_rate); 1239 if (WARN_ONCE(column == RS_COLUMN_INVALID, 1240 "Can't map rate 0x%x to column", 1241 tx_resp_hwrate)) 1242 return; 1243 1244 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 1245 attempts = info->status.ampdu_len; 1246 success = info->status.ampdu_ack_len; 1247 } else { 1248 attempts = info->status.rates[0].count; 1249 success = !!(info->flags & IEEE80211_TX_STAT_ACK); 1250 } 1251 1252 lq_sta->pers.tx_stats[column][index].total += attempts; 1253 lq_sta->pers.tx_stats[column][index].success += success; 1254 1255 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n", 1256 tx_resp_hwrate, success, attempts); 1257 return; 1258 } 1259 #endif 1260 1261 if (time_after(jiffies, 1262 (unsigned long)(lq_sta->last_tx + 1263 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) { 1264 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n"); 1265 iwl_mvm_rs_rate_init(mvm, sta, info->band, false); 1266 return; 1267 } 1268 lq_sta->last_tx = jiffies; 1269 1270 /* Ignore this Tx frame response if its initial rate doesn't match 1271 * that of latest Link Quality command. There may be stragglers 1272 * from a previous Link Quality command, but we're no longer interested 1273 * in those; they're either from the "active" mode while we're trying 1274 * to check "search" mode, or a prior "search" mode after we've moved 1275 * to a new "search" mode (which might become the new "active" mode). 1276 */ 1277 table = &lq_sta->lq; 1278 lq_hwrate = le32_to_cpu(table->rs_table[0]); 1279 rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate); 1280 1281 /* Here we actually compare this rate to the latest LQ command */ 1282 if (lq_color != LQ_FLAG_COLOR_GET(table->flags)) { 1283 IWL_DEBUG_RATE(mvm, 1284 "tx resp color 0x%x does not match 0x%x\n", 1285 lq_color, LQ_FLAG_COLOR_GET(table->flags)); 1286 1287 /* 1288 * Since rates mis-match, the last LQ command may have failed. 1289 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with 1290 * ... driver. 1291 */ 1292 lq_sta->missed_rate_counter++; 1293 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) { 1294 lq_sta->missed_rate_counter = 0; 1295 IWL_DEBUG_RATE(mvm, 1296 "Too many rates mismatch. Send sync LQ. rs_state %d\n", 1297 lq_sta->rs_state); 1298 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false); 1299 } 1300 /* Regardless, ignore this status info for outdated rate */ 1301 return; 1302 } else 1303 /* Rate did match, so reset the missed_rate_counter */ 1304 lq_sta->missed_rate_counter = 0; 1305 1306 if (!lq_sta->search_better_tbl) { 1307 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1308 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1309 } else { 1310 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1311 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1312 } 1313 1314 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) { 1315 IWL_DEBUG_RATE(mvm, 1316 "Neither active nor search matches tx rate\n"); 1317 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1318 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE"); 1319 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1320 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH"); 1321 rs_dump_rate(mvm, &lq_rate, "ACTUAL"); 1322 1323 /* 1324 * no matching table found, let's by-pass the data collection 1325 * and continue to perform rate scale to find the rate table 1326 */ 1327 rs_stay_in_table(lq_sta, true); 1328 goto done; 1329 } 1330 1331 /* 1332 * Updating the frame history depends on whether packets were 1333 * aggregated. 1334 * 1335 * For aggregation, all packets were transmitted at the same rate, the 1336 * first index into rate scale table. 1337 */ 1338 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 1339 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, tx_resp_rate.index, 1340 info->status.ampdu_len, 1341 info->status.ampdu_ack_len, 1342 reduced_txp); 1343 1344 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat 1345 * it as a single frame loss as we don't want the success ratio 1346 * to dip too quickly because a BA wasn't received. 1347 * For TPC, there's no need for this optimisation since we want 1348 * to recover very quickly from a bad power reduction and, 1349 * therefore we'd like the success ratio to get an immediate hit 1350 * when failing to get a BA, so we'd switch back to a lower or 1351 * zero power reduction. When FW transmits agg with a rate 1352 * different from the initial rate, it will not use reduced txp 1353 * and will send BA notification twice (one empty with reduced 1354 * txp equal to the value from LQ and one with reduced txp 0). 1355 * We need to update counters for each txp level accordingly. 1356 */ 1357 if (info->status.ampdu_ack_len == 0) 1358 info->status.ampdu_len = 1; 1359 1360 rs_collect_tlc_data(mvm, mvmsta, tid, curr_tbl, tx_resp_rate.index, 1361 info->status.ampdu_len, 1362 info->status.ampdu_ack_len); 1363 1364 /* Update success/fail counts if not searching for new mode */ 1365 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1366 lq_sta->total_success += info->status.ampdu_ack_len; 1367 lq_sta->total_failed += (info->status.ampdu_len - 1368 info->status.ampdu_ack_len); 1369 } 1370 } else { 1371 /* For legacy, update frame history with for each Tx retry. */ 1372 retries = info->status.rates[0].count - 1; 1373 /* HW doesn't send more than 15 retries */ 1374 retries = min(retries, 15); 1375 1376 /* The last transmission may have been successful */ 1377 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK); 1378 /* Collect data for each rate used during failed TX attempts */ 1379 for (i = 0; i <= retries; ++i) { 1380 lq_hwrate = le32_to_cpu(table->rs_table[i]); 1381 rs_rate_from_ucode_rate(lq_hwrate, info->band, 1382 &lq_rate); 1383 /* 1384 * Only collect stats if retried rate is in the same RS 1385 * table as active/search. 1386 */ 1387 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate)) 1388 tmp_tbl = curr_tbl; 1389 else if (rs_rate_column_match(&lq_rate, 1390 &other_tbl->rate)) 1391 tmp_tbl = other_tbl; 1392 else 1393 continue; 1394 1395 rs_collect_tpc_data(mvm, lq_sta, tmp_tbl, 1396 tx_resp_rate.index, 1, 1397 i < retries ? 0 : legacy_success, 1398 reduced_txp); 1399 rs_collect_tlc_data(mvm, mvmsta, tid, tmp_tbl, 1400 tx_resp_rate.index, 1, 1401 i < retries ? 0 : legacy_success); 1402 } 1403 1404 /* Update success/fail counts if not searching for new mode */ 1405 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1406 lq_sta->total_success += legacy_success; 1407 lq_sta->total_failed += retries + (1 - legacy_success); 1408 } 1409 } 1410 /* The last TX rate is cached in lq_sta; it's set in if/else above */ 1411 lq_sta->last_rate_n_flags = lq_hwrate; 1412 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp); 1413 done: 1414 /* See if there's a better rate or modulation mode to try. */ 1415 if (sta->supp_rates[info->band]) 1416 rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp); 1417 } 1418 1419 /* 1420 * mac80211 sends us Tx status 1421 */ 1422 static void rs_mac80211_tx_status(void *mvm_r, 1423 struct ieee80211_supported_band *sband, 1424 struct ieee80211_sta *sta, void *priv_sta, 1425 struct sk_buff *skb) 1426 { 1427 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1428 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r; 1429 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 1430 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1431 1432 if (!iwl_mvm_sta_from_mac80211(sta)->vif) 1433 return; 1434 1435 if (!ieee80211_is_data(hdr->frame_control) || 1436 info->flags & IEEE80211_TX_CTL_NO_ACK) 1437 return; 1438 1439 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info, 1440 ieee80211_is_qos_nullfunc(hdr->frame_control)); 1441 } 1442 1443 /* 1444 * Begin a period of staying with a selected modulation mode. 1445 * Set "stay_in_tbl" flag to prevent any mode switches. 1446 * Set frame tx success limits according to legacy vs. high-throughput, 1447 * and reset overall (spanning all rates) tx success history statistics. 1448 * These control how long we stay using same modulation mode before 1449 * searching for a new mode. 1450 */ 1451 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy, 1452 struct iwl_lq_sta *lq_sta) 1453 { 1454 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n"); 1455 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN; 1456 if (is_legacy) { 1457 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT; 1458 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT; 1459 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT; 1460 } else { 1461 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT; 1462 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT; 1463 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT; 1464 } 1465 lq_sta->table_count = 0; 1466 lq_sta->total_failed = 0; 1467 lq_sta->total_success = 0; 1468 lq_sta->flush_timer = jiffies; 1469 lq_sta->visited_columns = 0; 1470 } 1471 1472 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask) 1473 { 1474 if (rate_mask) 1475 return find_last_bit(&rate_mask, BITS_PER_LONG); 1476 return IWL_RATE_INVALID; 1477 } 1478 1479 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta, 1480 const struct rs_tx_column *column) 1481 { 1482 switch (column->mode) { 1483 case RS_LEGACY: 1484 return lq_sta->max_legacy_rate_idx; 1485 case RS_SISO: 1486 return lq_sta->max_siso_rate_idx; 1487 case RS_MIMO2: 1488 return lq_sta->max_mimo2_rate_idx; 1489 default: 1490 WARN_ON_ONCE(1); 1491 } 1492 1493 return lq_sta->max_legacy_rate_idx; 1494 } 1495 1496 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1497 const struct rs_tx_column *column, 1498 u32 bw) 1499 { 1500 /* Used to choose among HT tables */ 1501 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT]; 1502 1503 if (WARN_ON_ONCE(column->mode != RS_LEGACY && 1504 column->mode != RS_SISO && 1505 column->mode != RS_MIMO2)) 1506 return expected_tpt_legacy; 1507 1508 /* Legacy rates have only one table */ 1509 if (column->mode == RS_LEGACY) 1510 return expected_tpt_legacy; 1511 1512 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1513 /* Choose among many HT tables depending on number of streams 1514 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation 1515 * status */ 1516 if (column->mode == RS_SISO) { 1517 switch (bw) { 1518 case RATE_MCS_CHAN_WIDTH_20: 1519 ht_tbl_pointer = expected_tpt_siso_20MHz; 1520 break; 1521 case RATE_MCS_CHAN_WIDTH_40: 1522 ht_tbl_pointer = expected_tpt_siso_40MHz; 1523 break; 1524 case RATE_MCS_CHAN_WIDTH_80: 1525 ht_tbl_pointer = expected_tpt_siso_80MHz; 1526 break; 1527 case RATE_MCS_CHAN_WIDTH_160: 1528 ht_tbl_pointer = expected_tpt_siso_160MHz; 1529 break; 1530 default: 1531 WARN_ON_ONCE(1); 1532 } 1533 } else if (column->mode == RS_MIMO2) { 1534 switch (bw) { 1535 case RATE_MCS_CHAN_WIDTH_20: 1536 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1537 break; 1538 case RATE_MCS_CHAN_WIDTH_40: 1539 ht_tbl_pointer = expected_tpt_mimo2_40MHz; 1540 break; 1541 case RATE_MCS_CHAN_WIDTH_80: 1542 ht_tbl_pointer = expected_tpt_mimo2_80MHz; 1543 break; 1544 case RATE_MCS_CHAN_WIDTH_160: 1545 ht_tbl_pointer = expected_tpt_mimo2_160MHz; 1546 break; 1547 default: 1548 WARN_ON_ONCE(1); 1549 } 1550 } else { 1551 WARN_ON_ONCE(1); 1552 } 1553 1554 if (!column->sgi && !lq_sta->is_agg) /* Normal */ 1555 return ht_tbl_pointer[0]; 1556 else if (column->sgi && !lq_sta->is_agg) /* SGI */ 1557 return ht_tbl_pointer[1]; 1558 else if (!column->sgi && lq_sta->is_agg) /* AGG */ 1559 return ht_tbl_pointer[2]; 1560 else /* AGG+SGI */ 1561 return ht_tbl_pointer[3]; 1562 } 1563 1564 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1565 struct iwl_scale_tbl_info *tbl) 1566 { 1567 struct rs_rate *rate = &tbl->rate; 1568 const struct rs_tx_column *column = &rs_tx_columns[tbl->column]; 1569 1570 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw); 1571 } 1572 1573 static s32 rs_get_best_rate(struct iwl_mvm *mvm, 1574 struct iwl_lq_sta *lq_sta, 1575 struct iwl_scale_tbl_info *tbl, /* "search" */ 1576 unsigned long rate_mask, s8 index) 1577 { 1578 struct iwl_scale_tbl_info *active_tbl = 1579 &(lq_sta->lq_info[lq_sta->active_tbl]); 1580 s32 success_ratio = active_tbl->win[index].success_ratio; 1581 u16 expected_current_tpt = active_tbl->expected_tpt[index]; 1582 const u16 *tpt_tbl = tbl->expected_tpt; 1583 u16 high_low; 1584 u32 target_tpt; 1585 int rate_idx; 1586 1587 if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { 1588 target_tpt = 100 * expected_current_tpt; 1589 IWL_DEBUG_RATE(mvm, 1590 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n", 1591 success_ratio, target_tpt); 1592 } else { 1593 target_tpt = lq_sta->last_tpt; 1594 IWL_DEBUG_RATE(mvm, 1595 "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n", 1596 success_ratio, target_tpt); 1597 } 1598 1599 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG); 1600 1601 while (rate_idx != IWL_RATE_INVALID) { 1602 if (target_tpt < (100 * tpt_tbl[rate_idx])) 1603 break; 1604 1605 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask, 1606 tbl->rate.type); 1607 1608 rate_idx = (high_low >> 8) & 0xff; 1609 } 1610 1611 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n", 1612 rate_idx, target_tpt, 1613 rate_idx != IWL_RATE_INVALID ? 1614 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE); 1615 1616 return rate_idx; 1617 } 1618 1619 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta) 1620 { 1621 switch (sta->bandwidth) { 1622 case IEEE80211_STA_RX_BW_160: 1623 return RATE_MCS_CHAN_WIDTH_160; 1624 case IEEE80211_STA_RX_BW_80: 1625 return RATE_MCS_CHAN_WIDTH_80; 1626 case IEEE80211_STA_RX_BW_40: 1627 return RATE_MCS_CHAN_WIDTH_40; 1628 case IEEE80211_STA_RX_BW_20: 1629 default: 1630 return RATE_MCS_CHAN_WIDTH_20; 1631 } 1632 } 1633 1634 /* 1635 * Check whether we should continue using same modulation mode, or 1636 * begin search for a new mode, based on: 1637 * 1) # tx successes or failures while using this mode 1638 * 2) # times calling this function 1639 * 3) elapsed time in this mode (not used, for now) 1640 */ 1641 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search) 1642 { 1643 struct iwl_scale_tbl_info *tbl; 1644 int active_tbl; 1645 int flush_interval_passed = 0; 1646 struct iwl_mvm *mvm; 1647 1648 mvm = lq_sta->pers.drv; 1649 active_tbl = lq_sta->active_tbl; 1650 1651 tbl = &(lq_sta->lq_info[active_tbl]); 1652 1653 /* If we've been disallowing search, see if we should now allow it */ 1654 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1655 /* Elapsed time using current modulation mode */ 1656 if (lq_sta->flush_timer) 1657 flush_interval_passed = 1658 time_after(jiffies, 1659 (unsigned long)(lq_sta->flush_timer + 1660 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ))); 1661 1662 /* 1663 * Check if we should allow search for new modulation mode. 1664 * If many frames have failed or succeeded, or we've used 1665 * this same modulation for a long time, allow search, and 1666 * reset history stats that keep track of whether we should 1667 * allow a new search. Also (below) reset all bitmaps and 1668 * stats in active history. 1669 */ 1670 if (force_search || 1671 (lq_sta->total_failed > lq_sta->max_failure_limit) || 1672 (lq_sta->total_success > lq_sta->max_success_limit) || 1673 ((!lq_sta->search_better_tbl) && 1674 (lq_sta->flush_timer) && (flush_interval_passed))) { 1675 IWL_DEBUG_RATE(mvm, 1676 "LQ: stay is expired %d %d %d\n", 1677 lq_sta->total_failed, 1678 lq_sta->total_success, 1679 flush_interval_passed); 1680 1681 /* Allow search for new mode */ 1682 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED; 1683 IWL_DEBUG_RATE(mvm, 1684 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n"); 1685 lq_sta->total_failed = 0; 1686 lq_sta->total_success = 0; 1687 lq_sta->flush_timer = 0; 1688 /* mark the current column as visited */ 1689 lq_sta->visited_columns = BIT(tbl->column); 1690 /* 1691 * Else if we've used this modulation mode enough repetitions 1692 * (regardless of elapsed time or success/failure), reset 1693 * history bitmaps and rate-specific stats for all rates in 1694 * active table. 1695 */ 1696 } else { 1697 lq_sta->table_count++; 1698 if (lq_sta->table_count >= 1699 lq_sta->table_count_limit) { 1700 lq_sta->table_count = 0; 1701 1702 IWL_DEBUG_RATE(mvm, 1703 "LQ: stay in table clear win\n"); 1704 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1705 } 1706 } 1707 1708 /* If transitioning to allow "search", reset all history 1709 * bitmaps and stats in active table (this will become the new 1710 * "search" table). */ 1711 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) { 1712 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1713 } 1714 } 1715 } 1716 1717 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1718 struct iwl_scale_tbl_info *tbl, 1719 enum rs_action scale_action) 1720 { 1721 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 1722 1723 if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) || 1724 tbl->rate.index < IWL_RATE_MCS_5_INDEX || 1725 scale_action == RS_ACTION_DOWNSCALE) 1726 mvmsta->tlc_amsdu = false; 1727 else 1728 mvmsta->tlc_amsdu = true; 1729 } 1730 1731 /* 1732 * setup rate table in uCode 1733 */ 1734 static void rs_update_rate_tbl(struct iwl_mvm *mvm, 1735 struct ieee80211_sta *sta, 1736 struct iwl_lq_sta *lq_sta, 1737 struct iwl_scale_tbl_info *tbl) 1738 { 1739 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate); 1740 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false); 1741 } 1742 1743 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm, 1744 struct ieee80211_sta *sta, 1745 struct iwl_lq_sta *lq_sta, 1746 struct iwl_scale_tbl_info *tbl, 1747 enum rs_action scale_action) 1748 { 1749 if (sta->bandwidth != IEEE80211_STA_RX_BW_80) 1750 return false; 1751 1752 if (!is_vht_siso(&tbl->rate)) 1753 return false; 1754 1755 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) && 1756 (tbl->rate.index == IWL_RATE_MCS_0_INDEX) && 1757 (scale_action == RS_ACTION_DOWNSCALE)) { 1758 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20; 1759 tbl->rate.index = IWL_RATE_MCS_4_INDEX; 1760 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n"); 1761 goto tweaked; 1762 } 1763 1764 /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is 1765 * sustainable, i.e. we're past the test window. We can't go back 1766 * if MCS5 is just tested as this will happen always after switching 1767 * to 20Mhz MCS4 because the rate stats are cleared. 1768 */ 1769 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) && 1770 (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) && 1771 (scale_action == RS_ACTION_STAY)) || 1772 ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) && 1773 (scale_action == RS_ACTION_UPSCALE)))) { 1774 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80; 1775 tbl->rate.index = IWL_RATE_MCS_1_INDEX; 1776 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n"); 1777 goto tweaked; 1778 } 1779 1780 return false; 1781 1782 tweaked: 1783 rs_set_expected_tpt_table(lq_sta, tbl); 1784 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1785 return true; 1786 } 1787 1788 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm, 1789 struct iwl_lq_sta *lq_sta, 1790 struct ieee80211_sta *sta, 1791 struct iwl_scale_tbl_info *tbl) 1792 { 1793 int i, j, max_rate; 1794 enum rs_column next_col_id; 1795 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column]; 1796 const struct rs_tx_column *next_col; 1797 allow_column_func_t allow_func; 1798 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm); 1799 const u16 *expected_tpt_tbl; 1800 u16 tpt, max_expected_tpt; 1801 1802 for (i = 0; i < MAX_NEXT_COLUMNS; i++) { 1803 next_col_id = curr_col->next_columns[i]; 1804 1805 if (next_col_id == RS_COLUMN_INVALID) 1806 continue; 1807 1808 if (lq_sta->visited_columns & BIT(next_col_id)) { 1809 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n", 1810 next_col_id); 1811 continue; 1812 } 1813 1814 next_col = &rs_tx_columns[next_col_id]; 1815 1816 if (!rs_is_valid_ant(valid_ants, next_col->ant)) { 1817 IWL_DEBUG_RATE(mvm, 1818 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n", 1819 next_col_id, valid_ants, next_col->ant); 1820 continue; 1821 } 1822 1823 for (j = 0; j < MAX_COLUMN_CHECKS; j++) { 1824 allow_func = next_col->checks[j]; 1825 if (allow_func && !allow_func(mvm, sta, &tbl->rate, 1826 next_col)) 1827 break; 1828 } 1829 1830 if (j != MAX_COLUMN_CHECKS) { 1831 IWL_DEBUG_RATE(mvm, 1832 "Skip column %d: not allowed (check %d failed)\n", 1833 next_col_id, j); 1834 1835 continue; 1836 } 1837 1838 tpt = lq_sta->last_tpt / 100; 1839 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col, 1840 rs_bw_from_sta_bw(sta)); 1841 if (WARN_ON_ONCE(!expected_tpt_tbl)) 1842 continue; 1843 1844 max_rate = rs_get_max_allowed_rate(lq_sta, next_col); 1845 if (max_rate == IWL_RATE_INVALID) { 1846 IWL_DEBUG_RATE(mvm, 1847 "Skip column %d: no rate is allowed in this column\n", 1848 next_col_id); 1849 continue; 1850 } 1851 1852 max_expected_tpt = expected_tpt_tbl[max_rate]; 1853 if (tpt >= max_expected_tpt) { 1854 IWL_DEBUG_RATE(mvm, 1855 "Skip column %d: can't beat current TPT. Max expected %d current %d\n", 1856 next_col_id, max_expected_tpt, tpt); 1857 continue; 1858 } 1859 1860 IWL_DEBUG_RATE(mvm, 1861 "Found potential column %d. Max expected %d current %d\n", 1862 next_col_id, max_expected_tpt, tpt); 1863 break; 1864 } 1865 1866 if (i == MAX_NEXT_COLUMNS) 1867 return RS_COLUMN_INVALID; 1868 1869 return next_col_id; 1870 } 1871 1872 static int rs_switch_to_column(struct iwl_mvm *mvm, 1873 struct iwl_lq_sta *lq_sta, 1874 struct ieee80211_sta *sta, 1875 enum rs_column col_id) 1876 { 1877 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1878 struct iwl_scale_tbl_info *search_tbl = 1879 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 1880 struct rs_rate *rate = &search_tbl->rate; 1881 const struct rs_tx_column *column = &rs_tx_columns[col_id]; 1882 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column]; 1883 u32 sz = (sizeof(struct iwl_scale_tbl_info) - 1884 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); 1885 unsigned long rate_mask = 0; 1886 u32 rate_idx = 0; 1887 1888 memcpy(search_tbl, tbl, sz); 1889 1890 rate->sgi = column->sgi; 1891 rate->ant = column->ant; 1892 1893 if (column->mode == RS_LEGACY) { 1894 if (lq_sta->band == NL80211_BAND_5GHZ) 1895 rate->type = LQ_LEGACY_A; 1896 else 1897 rate->type = LQ_LEGACY_G; 1898 1899 rate->bw = RATE_MCS_CHAN_WIDTH_20; 1900 rate->ldpc = false; 1901 rate_mask = lq_sta->active_legacy_rate; 1902 } else if (column->mode == RS_SISO) { 1903 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; 1904 rate_mask = lq_sta->active_siso_rate; 1905 } else if (column->mode == RS_MIMO2) { 1906 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; 1907 rate_mask = lq_sta->active_mimo2_rate; 1908 } else { 1909 WARN_ONCE(1, "Bad column mode"); 1910 } 1911 1912 if (column->mode != RS_LEGACY) { 1913 rate->bw = rs_bw_from_sta_bw(sta); 1914 rate->ldpc = lq_sta->ldpc; 1915 } 1916 1917 search_tbl->column = col_id; 1918 rs_set_expected_tpt_table(lq_sta, search_tbl); 1919 1920 lq_sta->visited_columns |= BIT(col_id); 1921 1922 /* Get the best matching rate if we're changing modes. e.g. 1923 * SISO->MIMO, LEGACY->SISO, MIMO->SISO 1924 */ 1925 if (curr_column->mode != column->mode) { 1926 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl, 1927 rate_mask, rate->index); 1928 1929 if ((rate_idx == IWL_RATE_INVALID) || 1930 !(BIT(rate_idx) & rate_mask)) { 1931 IWL_DEBUG_RATE(mvm, 1932 "can not switch with index %d" 1933 " rate mask %lx\n", 1934 rate_idx, rate_mask); 1935 1936 goto err; 1937 } 1938 1939 rate->index = rate_idx; 1940 } 1941 1942 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n", 1943 col_id, rate->index); 1944 1945 return 0; 1946 1947 err: 1948 rate->type = LQ_NONE; 1949 return -1; 1950 } 1951 1952 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm, 1953 struct iwl_scale_tbl_info *tbl, 1954 s32 sr, int low, int high, 1955 int current_tpt, 1956 int low_tpt, int high_tpt) 1957 { 1958 enum rs_action action = RS_ACTION_STAY; 1959 1960 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) || 1961 (current_tpt == 0)) { 1962 IWL_DEBUG_RATE(mvm, 1963 "Decrease rate because of low SR\n"); 1964 return RS_ACTION_DOWNSCALE; 1965 } 1966 1967 if ((low_tpt == IWL_INVALID_VALUE) && 1968 (high_tpt == IWL_INVALID_VALUE) && 1969 (high != IWL_RATE_INVALID)) { 1970 IWL_DEBUG_RATE(mvm, 1971 "No data about high/low rates. Increase rate\n"); 1972 return RS_ACTION_UPSCALE; 1973 } 1974 1975 if ((high_tpt == IWL_INVALID_VALUE) && 1976 (high != IWL_RATE_INVALID) && 1977 (low_tpt != IWL_INVALID_VALUE) && 1978 (low_tpt < current_tpt)) { 1979 IWL_DEBUG_RATE(mvm, 1980 "No data about high rate and low rate is worse. Increase rate\n"); 1981 return RS_ACTION_UPSCALE; 1982 } 1983 1984 if ((high_tpt != IWL_INVALID_VALUE) && 1985 (high_tpt > current_tpt)) { 1986 IWL_DEBUG_RATE(mvm, 1987 "Higher rate is better. Increate rate\n"); 1988 return RS_ACTION_UPSCALE; 1989 } 1990 1991 if ((low_tpt != IWL_INVALID_VALUE) && 1992 (high_tpt != IWL_INVALID_VALUE) && 1993 (low_tpt < current_tpt) && 1994 (high_tpt < current_tpt)) { 1995 IWL_DEBUG_RATE(mvm, 1996 "Both high and low are worse. Maintain rate\n"); 1997 return RS_ACTION_STAY; 1998 } 1999 2000 if ((low_tpt != IWL_INVALID_VALUE) && 2001 (low_tpt > current_tpt)) { 2002 IWL_DEBUG_RATE(mvm, 2003 "Lower rate is better\n"); 2004 action = RS_ACTION_DOWNSCALE; 2005 goto out; 2006 } 2007 2008 if ((low_tpt == IWL_INVALID_VALUE) && 2009 (low != IWL_RATE_INVALID)) { 2010 IWL_DEBUG_RATE(mvm, 2011 "No data about lower rate\n"); 2012 action = RS_ACTION_DOWNSCALE; 2013 goto out; 2014 } 2015 2016 IWL_DEBUG_RATE(mvm, "Maintain rate\n"); 2017 2018 out: 2019 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) { 2020 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { 2021 IWL_DEBUG_RATE(mvm, 2022 "SR is above NO DECREASE. Avoid downscale\n"); 2023 action = RS_ACTION_STAY; 2024 } else if (current_tpt > (100 * tbl->expected_tpt[low])) { 2025 IWL_DEBUG_RATE(mvm, 2026 "Current TPT is higher than max expected in low rate. Avoid downscale\n"); 2027 action = RS_ACTION_STAY; 2028 } else { 2029 IWL_DEBUG_RATE(mvm, "Decrease rate\n"); 2030 } 2031 } 2032 2033 return action; 2034 } 2035 2036 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 2037 struct iwl_lq_sta *lq_sta) 2038 { 2039 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which 2040 * supports STBC of at least 1*SS 2041 */ 2042 if (!lq_sta->stbc_capable) 2043 return false; 2044 2045 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 2046 return false; 2047 2048 return true; 2049 } 2050 2051 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index, 2052 int *weaker, int *stronger) 2053 { 2054 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP; 2055 if (*weaker > TPC_MAX_REDUCTION) 2056 *weaker = TPC_INVALID; 2057 2058 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP; 2059 if (*stronger < 0) 2060 *stronger = TPC_INVALID; 2061 } 2062 2063 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif, 2064 struct rs_rate *rate, enum nl80211_band band) 2065 { 2066 int index = rate->index; 2067 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM); 2068 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION && 2069 !vif->bss_conf.ps); 2070 2071 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n", 2072 cam, sta_ps_disabled); 2073 /* 2074 * allow tpc only if power management is enabled, or bt coex 2075 * activity grade allows it and we are on 2.4Ghz. 2076 */ 2077 if ((cam || sta_ps_disabled) && 2078 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band)) 2079 return false; 2080 2081 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type); 2082 if (is_legacy(rate)) 2083 return index == IWL_RATE_54M_INDEX; 2084 if (is_ht(rate)) 2085 return index == IWL_RATE_MCS_7_INDEX; 2086 if (is_vht(rate)) 2087 return index == IWL_RATE_MCS_7_INDEX || 2088 index == IWL_RATE_MCS_8_INDEX || 2089 index == IWL_RATE_MCS_9_INDEX; 2090 2091 WARN_ON_ONCE(1); 2092 return false; 2093 } 2094 2095 enum tpc_action { 2096 TPC_ACTION_STAY, 2097 TPC_ACTION_DECREASE, 2098 TPC_ACTION_INCREASE, 2099 TPC_ACTION_NO_RESTIRCTION, 2100 }; 2101 2102 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm, 2103 s32 sr, int weak, int strong, 2104 int current_tpt, 2105 int weak_tpt, int strong_tpt) 2106 { 2107 /* stay until we have valid tpt */ 2108 if (current_tpt == IWL_INVALID_VALUE) { 2109 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n"); 2110 return TPC_ACTION_STAY; 2111 } 2112 2113 /* Too many failures, increase txp */ 2114 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) || 2115 current_tpt == 0) { 2116 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n"); 2117 return TPC_ACTION_NO_RESTIRCTION; 2118 } 2119 2120 /* try decreasing first if applicable */ 2121 if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) && 2122 weak != TPC_INVALID) { 2123 if (weak_tpt == IWL_INVALID_VALUE && 2124 (strong_tpt == IWL_INVALID_VALUE || 2125 current_tpt >= strong_tpt)) { 2126 IWL_DEBUG_RATE(mvm, 2127 "no weak txp measurement. decrease txp\n"); 2128 return TPC_ACTION_DECREASE; 2129 } 2130 2131 if (weak_tpt > current_tpt) { 2132 IWL_DEBUG_RATE(mvm, 2133 "lower txp has better tpt. decrease txp\n"); 2134 return TPC_ACTION_DECREASE; 2135 } 2136 } 2137 2138 /* next, increase if needed */ 2139 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) && 2140 strong != TPC_INVALID) { 2141 if (weak_tpt == IWL_INVALID_VALUE && 2142 strong_tpt != IWL_INVALID_VALUE && 2143 current_tpt < strong_tpt) { 2144 IWL_DEBUG_RATE(mvm, 2145 "higher txp has better tpt. increase txp\n"); 2146 return TPC_ACTION_INCREASE; 2147 } 2148 2149 if (weak_tpt < current_tpt && 2150 (strong_tpt == IWL_INVALID_VALUE || 2151 strong_tpt > current_tpt)) { 2152 IWL_DEBUG_RATE(mvm, 2153 "lower txp has worse tpt. increase txp\n"); 2154 return TPC_ACTION_INCREASE; 2155 } 2156 } 2157 2158 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n"); 2159 return TPC_ACTION_STAY; 2160 } 2161 2162 static bool rs_tpc_perform(struct iwl_mvm *mvm, 2163 struct ieee80211_sta *sta, 2164 struct iwl_lq_sta *lq_sta, 2165 struct iwl_scale_tbl_info *tbl) 2166 { 2167 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta); 2168 struct ieee80211_vif *vif = mvm_sta->vif; 2169 struct ieee80211_chanctx_conf *chanctx_conf; 2170 enum nl80211_band band; 2171 struct iwl_rate_scale_data *window; 2172 struct rs_rate *rate = &tbl->rate; 2173 enum tpc_action action; 2174 s32 sr; 2175 u8 cur = lq_sta->lq.reduced_tpc; 2176 int current_tpt; 2177 int weak, strong; 2178 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE; 2179 2180 #ifdef CONFIG_MAC80211_DEBUGFS 2181 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) { 2182 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n", 2183 lq_sta->pers.dbg_fixed_txp_reduction); 2184 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction; 2185 return cur != lq_sta->pers.dbg_fixed_txp_reduction; 2186 } 2187 #endif 2188 2189 rcu_read_lock(); 2190 chanctx_conf = rcu_dereference(vif->chanctx_conf); 2191 if (WARN_ON(!chanctx_conf)) 2192 band = NUM_NL80211_BANDS; 2193 else 2194 band = chanctx_conf->def.chan->band; 2195 rcu_read_unlock(); 2196 2197 if (!rs_tpc_allowed(mvm, vif, rate, band)) { 2198 IWL_DEBUG_RATE(mvm, 2199 "tpc is not allowed. remove txp restrictions\n"); 2200 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 2201 return cur != TPC_NO_REDUCTION; 2202 } 2203 2204 rs_get_adjacent_txp(mvm, cur, &weak, &strong); 2205 2206 /* Collect measured throughputs for current and adjacent rates */ 2207 window = tbl->tpc_win; 2208 sr = window[cur].success_ratio; 2209 current_tpt = window[cur].average_tpt; 2210 if (weak != TPC_INVALID) 2211 weak_tpt = window[weak].average_tpt; 2212 if (strong != TPC_INVALID) 2213 strong_tpt = window[strong].average_tpt; 2214 2215 IWL_DEBUG_RATE(mvm, 2216 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n", 2217 cur, current_tpt, sr, weak, strong, 2218 weak_tpt, strong_tpt); 2219 2220 action = rs_get_tpc_action(mvm, sr, weak, strong, 2221 current_tpt, weak_tpt, strong_tpt); 2222 2223 /* override actions if we are on the edge */ 2224 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) { 2225 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n"); 2226 action = TPC_ACTION_STAY; 2227 } else if (strong == TPC_INVALID && 2228 (action == TPC_ACTION_INCREASE || 2229 action == TPC_ACTION_NO_RESTIRCTION)) { 2230 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n"); 2231 action = TPC_ACTION_STAY; 2232 } 2233 2234 switch (action) { 2235 case TPC_ACTION_DECREASE: 2236 lq_sta->lq.reduced_tpc = weak; 2237 return true; 2238 case TPC_ACTION_INCREASE: 2239 lq_sta->lq.reduced_tpc = strong; 2240 return true; 2241 case TPC_ACTION_NO_RESTIRCTION: 2242 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 2243 return true; 2244 case TPC_ACTION_STAY: 2245 /* do nothing */ 2246 break; 2247 } 2248 return false; 2249 } 2250 2251 /* 2252 * Do rate scaling and search for new modulation mode. 2253 */ 2254 static void rs_rate_scale_perform(struct iwl_mvm *mvm, 2255 struct ieee80211_sta *sta, 2256 struct iwl_lq_sta *lq_sta, 2257 int tid, bool ndp) 2258 { 2259 int low = IWL_RATE_INVALID; 2260 int high = IWL_RATE_INVALID; 2261 int index; 2262 struct iwl_rate_scale_data *window = NULL; 2263 int current_tpt = IWL_INVALID_VALUE; 2264 int low_tpt = IWL_INVALID_VALUE; 2265 int high_tpt = IWL_INVALID_VALUE; 2266 u32 fail_count; 2267 enum rs_action scale_action = RS_ACTION_STAY; 2268 u16 rate_mask; 2269 u8 update_lq = 0; 2270 struct iwl_scale_tbl_info *tbl, *tbl1; 2271 u8 active_tbl = 0; 2272 u8 done_search = 0; 2273 u16 high_low; 2274 s32 sr; 2275 u8 prev_agg = lq_sta->is_agg; 2276 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 2277 struct rs_rate *rate; 2278 2279 lq_sta->is_agg = !!mvmsta->agg_tids; 2280 2281 /* 2282 * Select rate-scale / modulation-mode table to work with in 2283 * the rest of this function: "search" if searching for better 2284 * modulation mode, or "active" if doing rate scaling within a mode. 2285 */ 2286 if (!lq_sta->search_better_tbl) 2287 active_tbl = lq_sta->active_tbl; 2288 else 2289 active_tbl = 1 - lq_sta->active_tbl; 2290 2291 tbl = &(lq_sta->lq_info[active_tbl]); 2292 rate = &tbl->rate; 2293 2294 if (prev_agg != lq_sta->is_agg) { 2295 IWL_DEBUG_RATE(mvm, 2296 "Aggregation changed: prev %d current %d. Update expected TPT table\n", 2297 prev_agg, lq_sta->is_agg); 2298 rs_set_expected_tpt_table(lq_sta, tbl); 2299 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2300 } 2301 2302 /* current tx rate */ 2303 index = rate->index; 2304 2305 /* rates available for this association, and for modulation mode */ 2306 rate_mask = rs_get_supported_rates(lq_sta, rate); 2307 2308 if (!(BIT(index) & rate_mask)) { 2309 IWL_ERR(mvm, "Current Rate is not valid\n"); 2310 if (lq_sta->search_better_tbl) { 2311 /* revert to active table if search table is not valid*/ 2312 rate->type = LQ_NONE; 2313 lq_sta->search_better_tbl = 0; 2314 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 2315 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2316 } 2317 return; 2318 } 2319 2320 /* Get expected throughput table and history window for current rate */ 2321 if (!tbl->expected_tpt) { 2322 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n"); 2323 return; 2324 } 2325 2326 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2327 window = &(tbl->win[index]); 2328 2329 /* 2330 * If there is not enough history to calculate actual average 2331 * throughput, keep analyzing results of more tx frames, without 2332 * changing rate or mode (bypass most of the rest of this function). 2333 * Set up new rate table in uCode only if old rate is not supported 2334 * in current association (use new rate found above). 2335 */ 2336 fail_count = window->counter - window->success_counter; 2337 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) && 2338 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) { 2339 IWL_DEBUG_RATE(mvm, 2340 "%s: Test Window: succ %d total %d\n", 2341 rs_pretty_rate(rate), 2342 window->success_counter, window->counter); 2343 2344 /* Can't calculate this yet; not enough history */ 2345 window->average_tpt = IWL_INVALID_VALUE; 2346 2347 /* Should we stay with this modulation mode, 2348 * or search for a new one? */ 2349 rs_stay_in_table(lq_sta, false); 2350 2351 return; 2352 } 2353 2354 /* If we are searching for better modulation mode, check success. */ 2355 if (lq_sta->search_better_tbl) { 2356 /* If good success, continue using the "search" mode; 2357 * no need to send new link quality command, since we're 2358 * continuing to use the setup that we've been trying. */ 2359 if (window->average_tpt > lq_sta->last_tpt) { 2360 IWL_DEBUG_RATE(mvm, 2361 "SWITCHING TO NEW TABLE SR: %d " 2362 "cur-tpt %d old-tpt %d\n", 2363 window->success_ratio, 2364 window->average_tpt, 2365 lq_sta->last_tpt); 2366 2367 /* Swap tables; "search" becomes "active" */ 2368 lq_sta->active_tbl = active_tbl; 2369 current_tpt = window->average_tpt; 2370 /* Else poor success; go back to mode in "active" table */ 2371 } else { 2372 IWL_DEBUG_RATE(mvm, 2373 "GOING BACK TO THE OLD TABLE: SR %d " 2374 "cur-tpt %d old-tpt %d\n", 2375 window->success_ratio, 2376 window->average_tpt, 2377 lq_sta->last_tpt); 2378 2379 /* Nullify "search" table */ 2380 rate->type = LQ_NONE; 2381 2382 /* Revert to "active" table */ 2383 active_tbl = lq_sta->active_tbl; 2384 tbl = &(lq_sta->lq_info[active_tbl]); 2385 2386 /* Revert to "active" rate and throughput info */ 2387 index = tbl->rate.index; 2388 current_tpt = lq_sta->last_tpt; 2389 2390 /* Need to set up a new rate table in uCode */ 2391 update_lq = 1; 2392 } 2393 2394 /* Either way, we've made a decision; modulation mode 2395 * search is done, allow rate adjustment next time. */ 2396 lq_sta->search_better_tbl = 0; 2397 done_search = 1; /* Don't switch modes below! */ 2398 goto lq_update; 2399 } 2400 2401 /* (Else) not in search of better modulation mode, try for better 2402 * starting rate, while staying in this mode. */ 2403 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type); 2404 low = high_low & 0xff; 2405 high = (high_low >> 8) & 0xff; 2406 2407 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2408 2409 sr = window->success_ratio; 2410 2411 /* Collect measured throughputs for current and adjacent rates */ 2412 current_tpt = window->average_tpt; 2413 if (low != IWL_RATE_INVALID) 2414 low_tpt = tbl->win[low].average_tpt; 2415 if (high != IWL_RATE_INVALID) 2416 high_tpt = tbl->win[high].average_tpt; 2417 2418 IWL_DEBUG_RATE(mvm, 2419 "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n", 2420 rs_pretty_rate(rate), current_tpt, sr, 2421 low, high, low_tpt, high_tpt); 2422 2423 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high, 2424 current_tpt, low_tpt, high_tpt); 2425 2426 /* Force a search in case BT doesn't like us being in MIMO */ 2427 if (is_mimo(rate) && 2428 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) { 2429 IWL_DEBUG_RATE(mvm, 2430 "BT Coex forbids MIMO. Search for new config\n"); 2431 rs_stay_in_table(lq_sta, true); 2432 goto lq_update; 2433 } 2434 2435 switch (scale_action) { 2436 case RS_ACTION_DOWNSCALE: 2437 /* Decrease starting rate, update uCode's rate table */ 2438 if (low != IWL_RATE_INVALID) { 2439 update_lq = 1; 2440 index = low; 2441 } else { 2442 IWL_DEBUG_RATE(mvm, 2443 "At the bottom rate. Can't decrease\n"); 2444 } 2445 2446 break; 2447 case RS_ACTION_UPSCALE: 2448 /* Increase starting rate, update uCode's rate table */ 2449 if (high != IWL_RATE_INVALID) { 2450 update_lq = 1; 2451 index = high; 2452 } else { 2453 IWL_DEBUG_RATE(mvm, 2454 "At the top rate. Can't increase\n"); 2455 } 2456 2457 break; 2458 case RS_ACTION_STAY: 2459 /* No change */ 2460 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) 2461 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl); 2462 break; 2463 default: 2464 break; 2465 } 2466 2467 lq_update: 2468 /* Replace uCode's rate table for the destination station. */ 2469 if (update_lq) { 2470 tbl->rate.index = index; 2471 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK) 2472 rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action); 2473 rs_set_amsdu_len(mvm, sta, tbl, scale_action); 2474 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2475 } 2476 2477 rs_stay_in_table(lq_sta, false); 2478 2479 /* 2480 * Search for new modulation mode if we're: 2481 * 1) Not changing rates right now 2482 * 2) Not just finishing up a search 2483 * 3) Allowing a new search 2484 */ 2485 if (!update_lq && !done_search && 2486 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED 2487 && window->counter) { 2488 enum rs_column next_column; 2489 2490 /* Save current throughput to compare with "search" throughput*/ 2491 lq_sta->last_tpt = current_tpt; 2492 2493 IWL_DEBUG_RATE(mvm, 2494 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n", 2495 update_lq, done_search, lq_sta->rs_state, 2496 window->counter); 2497 2498 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl); 2499 if (next_column != RS_COLUMN_INVALID) { 2500 int ret = rs_switch_to_column(mvm, lq_sta, sta, 2501 next_column); 2502 if (!ret) 2503 lq_sta->search_better_tbl = 1; 2504 } else { 2505 IWL_DEBUG_RATE(mvm, 2506 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n"); 2507 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED; 2508 } 2509 2510 /* If new "search" mode was selected, set up in uCode table */ 2511 if (lq_sta->search_better_tbl) { 2512 /* Access the "search" table, clear its history. */ 2513 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 2514 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2515 2516 /* Use new "search" start rate */ 2517 index = tbl->rate.index; 2518 2519 rs_dump_rate(mvm, &tbl->rate, 2520 "Switch to SEARCH TABLE:"); 2521 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2522 } else { 2523 done_search = 1; 2524 } 2525 } 2526 2527 if (!ndp) 2528 rs_tl_turn_on_agg(mvm, mvmsta, tid, lq_sta, sta); 2529 2530 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) { 2531 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]); 2532 rs_set_stay_in_table(mvm, is_legacy(&tbl1->rate), lq_sta); 2533 } 2534 } 2535 2536 struct rs_init_rate_info { 2537 s8 rssi; 2538 u8 rate_idx; 2539 }; 2540 2541 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = { 2542 { -60, IWL_RATE_54M_INDEX }, 2543 { -64, IWL_RATE_48M_INDEX }, 2544 { -68, IWL_RATE_36M_INDEX }, 2545 { -80, IWL_RATE_24M_INDEX }, 2546 { -84, IWL_RATE_18M_INDEX }, 2547 { -85, IWL_RATE_12M_INDEX }, 2548 { -86, IWL_RATE_11M_INDEX }, 2549 { -88, IWL_RATE_5M_INDEX }, 2550 { -90, IWL_RATE_2M_INDEX }, 2551 { S8_MIN, IWL_RATE_1M_INDEX }, 2552 }; 2553 2554 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = { 2555 { -60, IWL_RATE_54M_INDEX }, 2556 { -64, IWL_RATE_48M_INDEX }, 2557 { -72, IWL_RATE_36M_INDEX }, 2558 { -80, IWL_RATE_24M_INDEX }, 2559 { -84, IWL_RATE_18M_INDEX }, 2560 { -85, IWL_RATE_12M_INDEX }, 2561 { -87, IWL_RATE_9M_INDEX }, 2562 { S8_MIN, IWL_RATE_6M_INDEX }, 2563 }; 2564 2565 static const struct rs_init_rate_info rs_optimal_rates_ht[] = { 2566 { -60, IWL_RATE_MCS_7_INDEX }, 2567 { -64, IWL_RATE_MCS_6_INDEX }, 2568 { -68, IWL_RATE_MCS_5_INDEX }, 2569 { -72, IWL_RATE_MCS_4_INDEX }, 2570 { -80, IWL_RATE_MCS_3_INDEX }, 2571 { -84, IWL_RATE_MCS_2_INDEX }, 2572 { -85, IWL_RATE_MCS_1_INDEX }, 2573 { S8_MIN, IWL_RATE_MCS_0_INDEX}, 2574 }; 2575 2576 /* MCS index 9 is not valid for 20MHz VHT channel width, 2577 * but is ok for 40, 80 and 160MHz channels. 2578 */ 2579 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = { 2580 { -60, IWL_RATE_MCS_8_INDEX }, 2581 { -64, IWL_RATE_MCS_7_INDEX }, 2582 { -68, IWL_RATE_MCS_6_INDEX }, 2583 { -72, IWL_RATE_MCS_5_INDEX }, 2584 { -80, IWL_RATE_MCS_4_INDEX }, 2585 { -84, IWL_RATE_MCS_3_INDEX }, 2586 { -85, IWL_RATE_MCS_2_INDEX }, 2587 { -87, IWL_RATE_MCS_1_INDEX }, 2588 { S8_MIN, IWL_RATE_MCS_0_INDEX}, 2589 }; 2590 2591 static const struct rs_init_rate_info rs_optimal_rates_vht[] = { 2592 { -60, IWL_RATE_MCS_9_INDEX }, 2593 { -64, IWL_RATE_MCS_8_INDEX }, 2594 { -68, IWL_RATE_MCS_7_INDEX }, 2595 { -72, IWL_RATE_MCS_6_INDEX }, 2596 { -80, IWL_RATE_MCS_5_INDEX }, 2597 { -84, IWL_RATE_MCS_4_INDEX }, 2598 { -85, IWL_RATE_MCS_3_INDEX }, 2599 { -87, IWL_RATE_MCS_2_INDEX }, 2600 { -88, IWL_RATE_MCS_1_INDEX }, 2601 { S8_MIN, IWL_RATE_MCS_0_INDEX }, 2602 }; 2603 2604 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */ 2605 2606 /* Init the optimal rate based on STA caps 2607 * This combined with rssi is used to report the last tx rate 2608 * to userspace when we haven't transmitted enough frames. 2609 */ 2610 static void rs_init_optimal_rate(struct iwl_mvm *mvm, 2611 struct ieee80211_sta *sta, 2612 struct iwl_lq_sta *lq_sta) 2613 { 2614 struct rs_rate *rate = &lq_sta->optimal_rate; 2615 2616 if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID) 2617 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; 2618 else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID) 2619 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; 2620 else if (lq_sta->band == NL80211_BAND_5GHZ) 2621 rate->type = LQ_LEGACY_A; 2622 else 2623 rate->type = LQ_LEGACY_G; 2624 2625 rate->bw = rs_bw_from_sta_bw(sta); 2626 rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL); 2627 2628 /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */ 2629 2630 if (is_mimo(rate)) { 2631 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate; 2632 } else if (is_siso(rate)) { 2633 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate; 2634 } else { 2635 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate; 2636 2637 if (lq_sta->band == NL80211_BAND_5GHZ) { 2638 lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy; 2639 lq_sta->optimal_nentries = 2640 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy); 2641 } else { 2642 lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy; 2643 lq_sta->optimal_nentries = 2644 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy); 2645 } 2646 } 2647 2648 if (is_vht(rate)) { 2649 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) { 2650 lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz; 2651 lq_sta->optimal_nentries = 2652 ARRAY_SIZE(rs_optimal_rates_vht_20mhz); 2653 } else { 2654 lq_sta->optimal_rates = rs_optimal_rates_vht; 2655 lq_sta->optimal_nentries = 2656 ARRAY_SIZE(rs_optimal_rates_vht); 2657 } 2658 } else if (is_ht(rate)) { 2659 lq_sta->optimal_rates = rs_optimal_rates_ht; 2660 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht); 2661 } 2662 } 2663 2664 /* Compute the optimal rate index based on RSSI */ 2665 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm, 2666 struct iwl_lq_sta *lq_sta) 2667 { 2668 struct rs_rate *rate = &lq_sta->optimal_rate; 2669 int i; 2670 2671 rate->index = find_first_bit(&lq_sta->optimal_rate_mask, 2672 BITS_PER_LONG); 2673 2674 for (i = 0; i < lq_sta->optimal_nentries; i++) { 2675 int rate_idx = lq_sta->optimal_rates[i].rate_idx; 2676 2677 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) && 2678 (BIT(rate_idx) & lq_sta->optimal_rate_mask)) { 2679 rate->index = rate_idx; 2680 break; 2681 } 2682 } 2683 2684 return rate; 2685 } 2686 2687 /* Choose an initial legacy rate and antenna to use based on the RSSI 2688 * of last Rx 2689 */ 2690 static void rs_get_initial_rate(struct iwl_mvm *mvm, 2691 struct ieee80211_sta *sta, 2692 struct iwl_lq_sta *lq_sta, 2693 enum nl80211_band band, 2694 struct rs_rate *rate) 2695 { 2696 int i, nentries; 2697 unsigned long active_rate; 2698 s8 best_rssi = S8_MIN; 2699 u8 best_ant = ANT_NONE; 2700 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 2701 const struct rs_init_rate_info *initial_rates; 2702 2703 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { 2704 if (!(lq_sta->pers.chains & BIT(i))) 2705 continue; 2706 2707 if (lq_sta->pers.chain_signal[i] > best_rssi) { 2708 best_rssi = lq_sta->pers.chain_signal[i]; 2709 best_ant = BIT(i); 2710 } 2711 } 2712 2713 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n", 2714 rs_pretty_ant(best_ant), best_rssi); 2715 2716 if (best_ant != ANT_A && best_ant != ANT_B) 2717 rate->ant = first_antenna(valid_tx_ant); 2718 else 2719 rate->ant = best_ant; 2720 2721 rate->sgi = false; 2722 rate->ldpc = false; 2723 rate->bw = RATE_MCS_CHAN_WIDTH_20; 2724 2725 rate->index = find_first_bit(&lq_sta->active_legacy_rate, 2726 BITS_PER_LONG); 2727 2728 if (band == NL80211_BAND_5GHZ) { 2729 rate->type = LQ_LEGACY_A; 2730 initial_rates = rs_optimal_rates_5ghz_legacy; 2731 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy); 2732 } else { 2733 rate->type = LQ_LEGACY_G; 2734 initial_rates = rs_optimal_rates_24ghz_legacy; 2735 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy); 2736 } 2737 2738 if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE) 2739 goto out; 2740 2741 /* Start from a higher rate if the corresponding debug capability 2742 * is enabled. The rate is chosen according to AP capabilities. 2743 * In case of VHT/HT when the rssi is low fallback to the case of 2744 * legacy rates. 2745 */ 2746 if (sta->vht_cap.vht_supported && 2747 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { 2748 switch (sta->bandwidth) { 2749 case IEEE80211_STA_RX_BW_160: 2750 case IEEE80211_STA_RX_BW_80: 2751 case IEEE80211_STA_RX_BW_40: 2752 initial_rates = rs_optimal_rates_vht; 2753 nentries = ARRAY_SIZE(rs_optimal_rates_vht); 2754 break; 2755 case IEEE80211_STA_RX_BW_20: 2756 initial_rates = rs_optimal_rates_vht_20mhz; 2757 nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz); 2758 break; 2759 default: 2760 IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth); 2761 goto out; 2762 } 2763 2764 active_rate = lq_sta->active_siso_rate; 2765 rate->type = LQ_VHT_SISO; 2766 rate->bw = rs_bw_from_sta_bw(sta); 2767 } else if (sta->ht_cap.ht_supported && 2768 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { 2769 initial_rates = rs_optimal_rates_ht; 2770 nentries = ARRAY_SIZE(rs_optimal_rates_ht); 2771 active_rate = lq_sta->active_siso_rate; 2772 rate->type = LQ_HT_SISO; 2773 } else { 2774 active_rate = lq_sta->active_legacy_rate; 2775 } 2776 2777 for (i = 0; i < nentries; i++) { 2778 int rate_idx = initial_rates[i].rate_idx; 2779 2780 if ((best_rssi >= initial_rates[i].rssi) && 2781 (BIT(rate_idx) & active_rate)) { 2782 rate->index = rate_idx; 2783 break; 2784 } 2785 } 2786 2787 out: 2788 rs_dump_rate(mvm, rate, "INITIAL"); 2789 } 2790 2791 /* Save info about RSSI of last Rx */ 2792 void rs_update_last_rssi(struct iwl_mvm *mvm, 2793 struct iwl_lq_sta *lq_sta, 2794 struct ieee80211_rx_status *rx_status) 2795 { 2796 int i; 2797 2798 lq_sta->pers.chains = rx_status->chains; 2799 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0]; 2800 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1]; 2801 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2]; 2802 lq_sta->pers.last_rssi = S8_MIN; 2803 2804 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { 2805 if (!(lq_sta->pers.chains & BIT(i))) 2806 continue; 2807 2808 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi) 2809 lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i]; 2810 } 2811 } 2812 2813 /** 2814 * rs_initialize_lq - Initialize a station's hardware rate table 2815 * 2816 * The uCode's station table contains a table of fallback rates 2817 * for automatic fallback during transmission. 2818 * 2819 * NOTE: This sets up a default set of values. These will be replaced later 2820 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of 2821 * rc80211_simple. 2822 * 2823 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before 2824 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD, 2825 * which requires station table entry to exist). 2826 */ 2827 static void rs_initialize_lq(struct iwl_mvm *mvm, 2828 struct ieee80211_sta *sta, 2829 struct iwl_lq_sta *lq_sta, 2830 enum nl80211_band band, 2831 bool init) 2832 { 2833 struct iwl_scale_tbl_info *tbl; 2834 struct rs_rate *rate; 2835 u8 active_tbl = 0; 2836 2837 if (!sta || !lq_sta) 2838 return; 2839 2840 if (!lq_sta->search_better_tbl) 2841 active_tbl = lq_sta->active_tbl; 2842 else 2843 active_tbl = 1 - lq_sta->active_tbl; 2844 2845 tbl = &(lq_sta->lq_info[active_tbl]); 2846 rate = &tbl->rate; 2847 2848 rs_get_initial_rate(mvm, sta, lq_sta, band, rate); 2849 rs_init_optimal_rate(mvm, sta, lq_sta); 2850 2851 WARN_ONCE(rate->ant != ANT_A && rate->ant != ANT_B, 2852 "ant: 0x%x, chains 0x%x, fw tx ant: 0x%x, nvm tx ant: 0x%x\n", 2853 rate->ant, lq_sta->pers.chains, mvm->fw->valid_tx_ant, 2854 mvm->nvm_data ? mvm->nvm_data->valid_tx_ant : ANT_INVALID); 2855 2856 tbl->column = rs_get_column_from_rate(rate); 2857 2858 rs_set_expected_tpt_table(lq_sta, tbl); 2859 rs_fill_lq_cmd(mvm, sta, lq_sta, rate); 2860 /* TODO restore station should remember the lq cmd */ 2861 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init); 2862 } 2863 2864 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta, 2865 struct ieee80211_tx_rate_control *txrc) 2866 { 2867 struct sk_buff *skb = txrc->skb; 2868 struct iwl_op_mode *op_mode __maybe_unused = 2869 (struct iwl_op_mode *)mvm_r; 2870 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 2871 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2872 struct iwl_lq_sta *lq_sta = mvm_sta; 2873 struct rs_rate *optimal_rate; 2874 u32 last_ucode_rate; 2875 2876 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) { 2877 /* if vif isn't initialized mvm doesn't know about 2878 * this station, so don't do anything with the it 2879 */ 2880 sta = NULL; 2881 mvm_sta = NULL; 2882 } 2883 2884 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2885 2886 /* Treat uninitialized rate scaling data same as non-existing. */ 2887 if (lq_sta && !lq_sta->pers.drv) { 2888 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n"); 2889 mvm_sta = NULL; 2890 } 2891 2892 /* Send management frames and NO_ACK data using lowest rate. */ 2893 if (rate_control_send_low(sta, mvm_sta, txrc)) 2894 return; 2895 2896 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags, 2897 info->band, &info->control.rates[0]); 2898 info->control.rates[0].count = 1; 2899 2900 /* Report the optimal rate based on rssi and STA caps if we haven't 2901 * converged yet (too little traffic) or exploring other modulations 2902 */ 2903 if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) { 2904 optimal_rate = rs_get_optimal_rate(mvm, lq_sta); 2905 last_ucode_rate = ucode_rate_from_rs_rate(mvm, 2906 optimal_rate); 2907 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band, 2908 &txrc->reported_rate); 2909 } 2910 } 2911 2912 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta, 2913 gfp_t gfp) 2914 { 2915 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 2916 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate; 2917 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 2918 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta; 2919 2920 IWL_DEBUG_RATE(mvm, "create station rate scale window\n"); 2921 2922 lq_sta->pers.drv = mvm; 2923 #ifdef CONFIG_MAC80211_DEBUGFS 2924 lq_sta->pers.dbg_fixed_rate = 0; 2925 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID; 2926 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 2927 #endif 2928 lq_sta->pers.chains = 0; 2929 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal)); 2930 lq_sta->pers.last_rssi = S8_MIN; 2931 2932 return &mvmsta->lq_sta; 2933 } 2934 2935 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap, 2936 int nss) 2937 { 2938 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) & 2939 (0x3 << (2 * (nss - 1))); 2940 rx_mcs >>= (2 * (nss - 1)); 2941 2942 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7) 2943 return IWL_RATE_MCS_7_INDEX; 2944 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8) 2945 return IWL_RATE_MCS_8_INDEX; 2946 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9) 2947 return IWL_RATE_MCS_9_INDEX; 2948 2949 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED); 2950 return -1; 2951 } 2952 2953 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta, 2954 struct ieee80211_sta_vht_cap *vht_cap, 2955 struct iwl_lq_sta *lq_sta) 2956 { 2957 int i; 2958 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1); 2959 2960 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 2961 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 2962 if (i == IWL_RATE_9M_INDEX) 2963 continue; 2964 2965 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 2966 if (i == IWL_RATE_MCS_9_INDEX && 2967 sta->bandwidth == IEEE80211_STA_RX_BW_20) 2968 continue; 2969 2970 lq_sta->active_siso_rate |= BIT(i); 2971 } 2972 } 2973 2974 if (sta->rx_nss < 2) 2975 return; 2976 2977 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2); 2978 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 2979 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 2980 if (i == IWL_RATE_9M_INDEX) 2981 continue; 2982 2983 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 2984 if (i == IWL_RATE_MCS_9_INDEX && 2985 sta->bandwidth == IEEE80211_STA_RX_BW_20) 2986 continue; 2987 2988 lq_sta->active_mimo2_rate |= BIT(i); 2989 } 2990 } 2991 } 2992 2993 static void rs_ht_init(struct iwl_mvm *mvm, 2994 struct ieee80211_sta *sta, 2995 struct iwl_lq_sta *lq_sta, 2996 struct ieee80211_sta_ht_cap *ht_cap) 2997 { 2998 /* active_siso_rate mask includes 9 MBits (bit 5), 2999 * and CCK (bits 0-3), supp_rates[] does not; 3000 * shift to convert format, force 9 MBits off. 3001 */ 3002 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1; 3003 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1; 3004 lq_sta->active_siso_rate &= ~((u16)0x2); 3005 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE; 3006 3007 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1; 3008 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1; 3009 lq_sta->active_mimo2_rate &= ~((u16)0x2); 3010 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE; 3011 3012 if (mvm->cfg->ht_params->ldpc && 3013 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING)) 3014 lq_sta->ldpc = true; 3015 3016 if (mvm->cfg->ht_params->stbc && 3017 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 3018 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC)) 3019 lq_sta->stbc_capable = true; 3020 3021 lq_sta->is_vht = false; 3022 } 3023 3024 static void rs_vht_init(struct iwl_mvm *mvm, 3025 struct ieee80211_sta *sta, 3026 struct iwl_lq_sta *lq_sta, 3027 struct ieee80211_sta_vht_cap *vht_cap) 3028 { 3029 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta); 3030 3031 if (mvm->cfg->ht_params->ldpc && 3032 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC)) 3033 lq_sta->ldpc = true; 3034 3035 if (mvm->cfg->ht_params->stbc && 3036 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 3037 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK)) 3038 lq_sta->stbc_capable = true; 3039 3040 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) && 3041 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 3042 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE)) 3043 lq_sta->bfer_capable = true; 3044 3045 lq_sta->is_vht = true; 3046 } 3047 3048 #ifdef CONFIG_IWLWIFI_DEBUGFS 3049 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm) 3050 { 3051 spin_lock_bh(&mvm->drv_stats_lock); 3052 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats)); 3053 spin_unlock_bh(&mvm->drv_stats_lock); 3054 } 3055 3056 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg) 3057 { 3058 u8 nss = 0; 3059 3060 spin_lock(&mvm->drv_stats_lock); 3061 3062 if (agg) 3063 mvm->drv_rx_stats.agg_frames++; 3064 3065 mvm->drv_rx_stats.success_frames++; 3066 3067 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { 3068 case RATE_MCS_CHAN_WIDTH_20: 3069 mvm->drv_rx_stats.bw_20_frames++; 3070 break; 3071 case RATE_MCS_CHAN_WIDTH_40: 3072 mvm->drv_rx_stats.bw_40_frames++; 3073 break; 3074 case RATE_MCS_CHAN_WIDTH_80: 3075 mvm->drv_rx_stats.bw_80_frames++; 3076 break; 3077 case RATE_MCS_CHAN_WIDTH_160: 3078 mvm->drv_rx_stats.bw_160_frames++; 3079 break; 3080 default: 3081 WARN_ONCE(1, "bad BW. rate 0x%x", rate); 3082 } 3083 3084 if (rate & RATE_MCS_HT_MSK) { 3085 mvm->drv_rx_stats.ht_frames++; 3086 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1; 3087 } else if (rate & RATE_MCS_VHT_MSK) { 3088 mvm->drv_rx_stats.vht_frames++; 3089 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >> 3090 RATE_VHT_MCS_NSS_POS) + 1; 3091 } else { 3092 mvm->drv_rx_stats.legacy_frames++; 3093 } 3094 3095 if (nss == 1) 3096 mvm->drv_rx_stats.siso_frames++; 3097 else if (nss == 2) 3098 mvm->drv_rx_stats.mimo2_frames++; 3099 3100 if (rate & RATE_MCS_SGI_MSK) 3101 mvm->drv_rx_stats.sgi_frames++; 3102 else 3103 mvm->drv_rx_stats.ngi_frames++; 3104 3105 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate; 3106 mvm->drv_rx_stats.last_frame_idx = 3107 (mvm->drv_rx_stats.last_frame_idx + 1) % 3108 ARRAY_SIZE(mvm->drv_rx_stats.last_rates); 3109 3110 spin_unlock(&mvm->drv_stats_lock); 3111 } 3112 #endif 3113 3114 /* 3115 * Called after adding a new station to initialize rate scaling 3116 */ 3117 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 3118 enum nl80211_band band, bool init) 3119 { 3120 int i, j; 3121 struct ieee80211_hw *hw = mvm->hw; 3122 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 3123 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; 3124 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3125 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta; 3126 struct ieee80211_supported_band *sband; 3127 unsigned long supp; /* must be unsigned long for for_each_set_bit */ 3128 3129 /* clear all non-persistent lq data */ 3130 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers)); 3131 3132 sband = hw->wiphy->bands[band]; 3133 3134 lq_sta->lq.sta_id = mvmsta->sta_id; 3135 mvmsta->tlc_amsdu = false; 3136 3137 for (j = 0; j < LQ_SIZE; j++) 3138 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]); 3139 3140 lq_sta->flush_timer = 0; 3141 lq_sta->last_tx = jiffies; 3142 3143 IWL_DEBUG_RATE(mvm, 3144 "LQ: *** rate scale station global init for station %d ***\n", 3145 mvmsta->sta_id); 3146 /* TODO: what is a good starting rate for STA? About middle? Maybe not 3147 * the lowest or the highest rate.. Could consider using RSSI from 3148 * previous packets? Need to have IEEE 802.1X auth succeed immediately 3149 * after assoc.. */ 3150 3151 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX; 3152 lq_sta->band = sband->band; 3153 /* 3154 * active legacy rates as per supported rates bitmap 3155 */ 3156 supp = sta->supp_rates[sband->band]; 3157 lq_sta->active_legacy_rate = 0; 3158 for_each_set_bit(i, &supp, BITS_PER_LONG) 3159 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value); 3160 3161 /* TODO: should probably account for rx_highest for both HT/VHT */ 3162 if (!vht_cap || !vht_cap->vht_supported) 3163 rs_ht_init(mvm, sta, lq_sta, ht_cap); 3164 else 3165 rs_vht_init(mvm, sta, lq_sta, vht_cap); 3166 3167 lq_sta->max_legacy_rate_idx = 3168 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate); 3169 lq_sta->max_siso_rate_idx = 3170 rs_get_max_rate_from_mask(lq_sta->active_siso_rate); 3171 lq_sta->max_mimo2_rate_idx = 3172 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate); 3173 3174 IWL_DEBUG_RATE(mvm, 3175 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n", 3176 lq_sta->active_legacy_rate, 3177 lq_sta->active_siso_rate, 3178 lq_sta->active_mimo2_rate, 3179 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable, 3180 lq_sta->bfer_capable); 3181 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n", 3182 lq_sta->max_legacy_rate_idx, 3183 lq_sta->max_siso_rate_idx, 3184 lq_sta->max_mimo2_rate_idx); 3185 3186 /* These values will be overridden later */ 3187 lq_sta->lq.single_stream_ant_msk = 3188 first_antenna(iwl_mvm_get_valid_tx_ant(mvm)); 3189 lq_sta->lq.dual_stream_ant_msk = ANT_AB; 3190 3191 /* as default allow aggregation for all tids */ 3192 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID; 3193 lq_sta->is_agg = 0; 3194 #ifdef CONFIG_IWLWIFI_DEBUGFS 3195 iwl_mvm_reset_frame_stats(mvm); 3196 #endif 3197 rs_initialize_lq(mvm, sta, lq_sta, band, init); 3198 } 3199 3200 static void rs_rate_update(void *mvm_r, 3201 struct ieee80211_supported_band *sband, 3202 struct cfg80211_chan_def *chandef, 3203 struct ieee80211_sta *sta, void *priv_sta, 3204 u32 changed) 3205 { 3206 u8 tid; 3207 struct iwl_op_mode *op_mode = 3208 (struct iwl_op_mode *)mvm_r; 3209 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 3210 3211 if (!iwl_mvm_sta_from_mac80211(sta)->vif) 3212 return; 3213 3214 /* Stop any ongoing aggregations as rs starts off assuming no agg */ 3215 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++) 3216 ieee80211_stop_tx_ba_session(sta, tid); 3217 3218 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false); 3219 } 3220 3221 #ifdef CONFIG_MAC80211_DEBUGFS 3222 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm, 3223 struct iwl_lq_cmd *lq_cmd, 3224 enum nl80211_band band, 3225 u32 ucode_rate) 3226 { 3227 struct rs_rate rate; 3228 int i; 3229 int num_rates = ARRAY_SIZE(lq_cmd->rs_table); 3230 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate); 3231 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; 3232 3233 for (i = 0; i < num_rates; i++) 3234 lq_cmd->rs_table[i] = ucode_rate_le32; 3235 3236 rs_rate_from_ucode_rate(ucode_rate, band, &rate); 3237 3238 if (is_mimo(&rate)) 3239 lq_cmd->mimo_delim = num_rates - 1; 3240 else 3241 lq_cmd->mimo_delim = 0; 3242 3243 lq_cmd->reduced_tpc = 0; 3244 3245 if (num_of_ant(ant) == 1) 3246 lq_cmd->single_stream_ant_msk = ant; 3247 3248 if (!mvm->trans->cfg->gen2) 3249 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF; 3250 else 3251 lq_cmd->agg_frame_cnt_limit = 3252 LINK_QUAL_AGG_FRAME_LIMIT_GEN2_DEF; 3253 } 3254 #endif /* CONFIG_MAC80211_DEBUGFS */ 3255 3256 static void rs_fill_rates_for_column(struct iwl_mvm *mvm, 3257 struct iwl_lq_sta *lq_sta, 3258 struct rs_rate *rate, 3259 __le32 *rs_table, int *rs_table_index, 3260 int num_rates, int num_retries, 3261 u8 valid_tx_ant, bool toggle_ant) 3262 { 3263 int i, j; 3264 __le32 ucode_rate; 3265 bool bottom_reached = false; 3266 int prev_rate_idx = rate->index; 3267 int end = LINK_QUAL_MAX_RETRY_NUM; 3268 int index = *rs_table_index; 3269 3270 for (i = 0; i < num_rates && index < end; i++) { 3271 for (j = 0; j < num_retries && index < end; j++, index++) { 3272 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm, 3273 rate)); 3274 rs_table[index] = ucode_rate; 3275 if (toggle_ant) 3276 rs_toggle_antenna(valid_tx_ant, rate); 3277 } 3278 3279 prev_rate_idx = rate->index; 3280 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate); 3281 if (bottom_reached && !is_legacy(rate)) 3282 break; 3283 } 3284 3285 if (!bottom_reached && !is_legacy(rate)) 3286 rate->index = prev_rate_idx; 3287 3288 *rs_table_index = index; 3289 } 3290 3291 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI 3292 * column the rate table should look like this: 3293 * 3294 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 3295 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 3296 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 3297 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 3298 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 3299 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 3300 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI 3301 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI 3302 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI 3303 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps 3304 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps 3305 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps 3306 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps 3307 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps 3308 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps 3309 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps 3310 */ 3311 static void rs_build_rates_table(struct iwl_mvm *mvm, 3312 struct ieee80211_sta *sta, 3313 struct iwl_lq_sta *lq_sta, 3314 const struct rs_rate *initial_rate) 3315 { 3316 struct rs_rate rate; 3317 int num_rates, num_retries, index = 0; 3318 u8 valid_tx_ant = 0; 3319 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3320 bool toggle_ant = false; 3321 u32 color; 3322 3323 memcpy(&rate, initial_rate, sizeof(rate)); 3324 3325 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 3326 3327 /* TODO: remove old API when min FW API hits 14 */ 3328 if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) && 3329 rs_stbc_allow(mvm, sta, lq_sta)) 3330 rate.stbc = true; 3331 3332 if (is_siso(&rate)) { 3333 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES; 3334 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3335 } else if (is_mimo(&rate)) { 3336 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES; 3337 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3338 } else { 3339 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES; 3340 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES; 3341 toggle_ant = true; 3342 } 3343 3344 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3345 num_rates, num_retries, valid_tx_ant, 3346 toggle_ant); 3347 3348 rs_get_lower_rate_down_column(lq_sta, &rate); 3349 3350 if (is_siso(&rate)) { 3351 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES; 3352 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES; 3353 lq_cmd->mimo_delim = index; 3354 } else if (is_legacy(&rate)) { 3355 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3356 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3357 } else { 3358 WARN_ON_ONCE(1); 3359 } 3360 3361 toggle_ant = true; 3362 3363 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3364 num_rates, num_retries, valid_tx_ant, 3365 toggle_ant); 3366 3367 rs_get_lower_rate_down_column(lq_sta, &rate); 3368 3369 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3370 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3371 3372 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3373 num_rates, num_retries, valid_tx_ant, 3374 toggle_ant); 3375 3376 /* update the color of the LQ command (as a counter at bits 1-3) */ 3377 color = LQ_FLAGS_COLOR_INC(LQ_FLAG_COLOR_GET(lq_cmd->flags)); 3378 lq_cmd->flags = LQ_FLAG_COLOR_SET(lq_cmd->flags, color); 3379 } 3380 3381 struct rs_bfer_active_iter_data { 3382 struct ieee80211_sta *exclude_sta; 3383 struct iwl_mvm_sta *bfer_mvmsta; 3384 }; 3385 3386 static void rs_bfer_active_iter(void *_data, 3387 struct ieee80211_sta *sta) 3388 { 3389 struct rs_bfer_active_iter_data *data = _data; 3390 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3391 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq; 3392 u32 ss_params = le32_to_cpu(lq_cmd->ss_params); 3393 3394 if (sta == data->exclude_sta) 3395 return; 3396 3397 /* The current sta has BFER allowed */ 3398 if (ss_params & LQ_SS_BFER_ALLOWED) { 3399 WARN_ON_ONCE(data->bfer_mvmsta != NULL); 3400 3401 data->bfer_mvmsta = mvmsta; 3402 } 3403 } 3404 3405 static int rs_bfer_priority(struct iwl_mvm_sta *sta) 3406 { 3407 int prio = -1; 3408 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif); 3409 3410 switch (viftype) { 3411 case NL80211_IFTYPE_AP: 3412 case NL80211_IFTYPE_P2P_GO: 3413 prio = 3; 3414 break; 3415 case NL80211_IFTYPE_P2P_CLIENT: 3416 prio = 2; 3417 break; 3418 case NL80211_IFTYPE_STATION: 3419 prio = 1; 3420 break; 3421 default: 3422 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id); 3423 prio = -1; 3424 } 3425 3426 return prio; 3427 } 3428 3429 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */ 3430 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1, 3431 struct iwl_mvm_sta *sta2) 3432 { 3433 int prio1 = rs_bfer_priority(sta1); 3434 int prio2 = rs_bfer_priority(sta2); 3435 3436 if (prio1 > prio2) 3437 return 1; 3438 if (prio1 < prio2) 3439 return -1; 3440 return 0; 3441 } 3442 3443 static void rs_set_lq_ss_params(struct iwl_mvm *mvm, 3444 struct ieee80211_sta *sta, 3445 struct iwl_lq_sta *lq_sta, 3446 const struct rs_rate *initial_rate) 3447 { 3448 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3449 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3450 struct rs_bfer_active_iter_data data = { 3451 .exclude_sta = sta, 3452 .bfer_mvmsta = NULL, 3453 }; 3454 struct iwl_mvm_sta *bfer_mvmsta = NULL; 3455 u32 ss_params = LQ_SS_PARAMS_VALID; 3456 3457 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 3458 goto out; 3459 3460 #ifdef CONFIG_MAC80211_DEBUGFS 3461 /* Check if forcing the decision is configured. 3462 * Note that SISO is forced by not allowing STBC or BFER 3463 */ 3464 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC) 3465 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE); 3466 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER) 3467 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE); 3468 3469 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) { 3470 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n", 3471 lq_sta->pers.ss_force); 3472 goto out; 3473 } 3474 #endif 3475 3476 if (lq_sta->stbc_capable) 3477 ss_params |= LQ_SS_STBC_1SS_ALLOWED; 3478 3479 if (!lq_sta->bfer_capable) 3480 goto out; 3481 3482 ieee80211_iterate_stations_atomic(mvm->hw, 3483 rs_bfer_active_iter, 3484 &data); 3485 bfer_mvmsta = data.bfer_mvmsta; 3486 3487 /* This code is safe as it doesn't run concurrently for different 3488 * stations. This is guaranteed by the fact that calls to 3489 * ieee80211_tx_status wouldn't run concurrently for a single HW. 3490 */ 3491 if (!bfer_mvmsta) { 3492 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n"); 3493 3494 ss_params |= LQ_SS_BFER_ALLOWED; 3495 goto out; 3496 } 3497 3498 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n", 3499 bfer_mvmsta->sta_id); 3500 3501 /* Disallow BFER on another STA if active and we're a higher priority */ 3502 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) { 3503 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq; 3504 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params); 3505 3506 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED; 3507 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params); 3508 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false); 3509 3510 ss_params |= LQ_SS_BFER_ALLOWED; 3511 IWL_DEBUG_RATE(mvm, 3512 "Lower priority BFER sta found (%d). Switch BFER\n", 3513 bfer_mvmsta->sta_id); 3514 } 3515 out: 3516 lq_cmd->ss_params = cpu_to_le32(ss_params); 3517 } 3518 3519 static void rs_fill_lq_cmd(struct iwl_mvm *mvm, 3520 struct ieee80211_sta *sta, 3521 struct iwl_lq_sta *lq_sta, 3522 const struct rs_rate *initial_rate) 3523 { 3524 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3525 struct iwl_mvm_sta *mvmsta; 3526 struct iwl_mvm_vif *mvmvif; 3527 3528 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START; 3529 lq_cmd->agg_time_limit = 3530 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT); 3531 3532 #ifdef CONFIG_MAC80211_DEBUGFS 3533 if (lq_sta->pers.dbg_fixed_rate) { 3534 rs_build_rates_table_from_fixed(mvm, lq_cmd, 3535 lq_sta->band, 3536 lq_sta->pers.dbg_fixed_rate); 3537 return; 3538 } 3539 #endif 3540 if (WARN_ON_ONCE(!sta || !initial_rate)) 3541 return; 3542 3543 rs_build_rates_table(mvm, sta, lq_sta, initial_rate); 3544 3545 if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS)) 3546 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate); 3547 3548 mvmsta = iwl_mvm_sta_from_mac80211(sta); 3549 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif); 3550 3551 if (num_of_ant(initial_rate->ant) == 1) 3552 lq_cmd->single_stream_ant_msk = initial_rate->ant; 3553 3554 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize; 3555 3556 /* 3557 * In case of low latency, tell the firmware to leave a frame in the 3558 * Tx Fifo so that it can start a transaction in the same TxOP. This 3559 * basically allows the firmware to send bursts. 3560 */ 3561 if (iwl_mvm_vif_low_latency(mvmvif)) 3562 lq_cmd->agg_frame_cnt_limit--; 3563 3564 if (mvmsta->vif->p2p) 3565 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK; 3566 3567 lq_cmd->agg_time_limit = 3568 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta)); 3569 } 3570 3571 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) 3572 { 3573 return hw->priv; 3574 } 3575 /* rate scale requires free function to be implemented */ 3576 static void rs_free(void *mvm_rate) 3577 { 3578 return; 3579 } 3580 3581 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, 3582 void *mvm_sta) 3583 { 3584 struct iwl_op_mode *op_mode __maybe_unused = mvm_r; 3585 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 3586 3587 IWL_DEBUG_RATE(mvm, "enter\n"); 3588 IWL_DEBUG_RATE(mvm, "leave\n"); 3589 } 3590 3591 #ifdef CONFIG_MAC80211_DEBUGFS 3592 int rs_pretty_print_rate(char *buf, const u32 rate) 3593 { 3594 3595 char *type, *bw; 3596 u8 mcs = 0, nss = 0; 3597 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; 3598 3599 if (!(rate & RATE_MCS_HT_MSK) && 3600 !(rate & RATE_MCS_VHT_MSK)) { 3601 int index = iwl_hwrate_to_plcp_idx(rate); 3602 3603 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n", 3604 rs_pretty_ant(ant), 3605 index == IWL_RATE_INVALID ? "BAD" : 3606 iwl_rate_mcs[index].mbps); 3607 } 3608 3609 if (rate & RATE_MCS_VHT_MSK) { 3610 type = "VHT"; 3611 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK; 3612 nss = ((rate & RATE_VHT_MCS_NSS_MSK) 3613 >> RATE_VHT_MCS_NSS_POS) + 1; 3614 } else if (rate & RATE_MCS_HT_MSK) { 3615 type = "HT"; 3616 mcs = rate & RATE_HT_MCS_INDEX_MSK; 3617 nss = ((rate & RATE_HT_MCS_NSS_MSK) 3618 >> RATE_HT_MCS_NSS_POS) + 1; 3619 } else { 3620 type = "Unknown"; /* shouldn't happen */ 3621 } 3622 3623 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { 3624 case RATE_MCS_CHAN_WIDTH_20: 3625 bw = "20Mhz"; 3626 break; 3627 case RATE_MCS_CHAN_WIDTH_40: 3628 bw = "40Mhz"; 3629 break; 3630 case RATE_MCS_CHAN_WIDTH_80: 3631 bw = "80Mhz"; 3632 break; 3633 case RATE_MCS_CHAN_WIDTH_160: 3634 bw = "160Mhz"; 3635 break; 3636 default: 3637 bw = "BAD BW"; 3638 } 3639 3640 return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s\n", 3641 type, rs_pretty_ant(ant), bw, mcs, nss, 3642 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ", 3643 (rate & RATE_MCS_STBC_MSK) ? "STBC " : "", 3644 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "", 3645 (rate & RATE_MCS_BF_MSK) ? "BF " : ""); 3646 } 3647 3648 /** 3649 * Program the device to use fixed rate for frame transmit 3650 * This is for debugging/testing only 3651 * once the device start use fixed rate, we need to reload the module 3652 * to being back the normal operation. 3653 */ 3654 static void rs_program_fix_rate(struct iwl_mvm *mvm, 3655 struct iwl_lq_sta *lq_sta) 3656 { 3657 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */ 3658 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3659 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3660 3661 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n", 3662 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate); 3663 3664 if (lq_sta->pers.dbg_fixed_rate) { 3665 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL); 3666 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false); 3667 } 3668 } 3669 3670 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file, 3671 const char __user *user_buf, size_t count, loff_t *ppos) 3672 { 3673 struct iwl_lq_sta *lq_sta = file->private_data; 3674 struct iwl_mvm *mvm; 3675 char buf[64]; 3676 size_t buf_size; 3677 u32 parsed_rate; 3678 3679 mvm = lq_sta->pers.drv; 3680 memset(buf, 0, sizeof(buf)); 3681 buf_size = min(count, sizeof(buf) - 1); 3682 if (copy_from_user(buf, user_buf, buf_size)) 3683 return -EFAULT; 3684 3685 if (sscanf(buf, "%x", &parsed_rate) == 1) 3686 lq_sta->pers.dbg_fixed_rate = parsed_rate; 3687 else 3688 lq_sta->pers.dbg_fixed_rate = 0; 3689 3690 rs_program_fix_rate(mvm, lq_sta); 3691 3692 return count; 3693 } 3694 3695 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file, 3696 char __user *user_buf, size_t count, loff_t *ppos) 3697 { 3698 char *buff; 3699 int desc = 0; 3700 int i = 0; 3701 ssize_t ret; 3702 3703 struct iwl_lq_sta *lq_sta = file->private_data; 3704 struct iwl_mvm_sta *mvmsta = 3705 container_of(lq_sta, struct iwl_mvm_sta, lq_sta); 3706 struct iwl_mvm *mvm; 3707 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 3708 struct rs_rate *rate = &tbl->rate; 3709 u32 ss_params; 3710 3711 mvm = lq_sta->pers.drv; 3712 buff = kmalloc(2048, GFP_KERNEL); 3713 if (!buff) 3714 return -ENOMEM; 3715 3716 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id); 3717 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n", 3718 lq_sta->total_failed, lq_sta->total_success, 3719 lq_sta->active_legacy_rate); 3720 desc += sprintf(buff+desc, "fixed rate 0x%X\n", 3721 lq_sta->pers.dbg_fixed_rate); 3722 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n", 3723 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "", 3724 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "", 3725 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : ""); 3726 desc += sprintf(buff+desc, "lq type %s\n", 3727 (is_legacy(rate)) ? "legacy" : 3728 is_vht(rate) ? "VHT" : "HT"); 3729 if (!is_legacy(rate)) { 3730 desc += sprintf(buff + desc, " %s", 3731 (is_siso(rate)) ? "SISO" : "MIMO2"); 3732 desc += sprintf(buff + desc, " %s", 3733 (is_ht20(rate)) ? "20MHz" : 3734 (is_ht40(rate)) ? "40MHz" : 3735 (is_ht80(rate)) ? "80MHz" : 3736 (is_ht160(rate)) ? "160MHz" : "BAD BW"); 3737 desc += sprintf(buff + desc, " %s %s %s %s\n", 3738 (rate->sgi) ? "SGI" : "NGI", 3739 (rate->ldpc) ? "LDPC" : "BCC", 3740 (lq_sta->is_agg) ? "AGG on" : "", 3741 (mvmsta->tlc_amsdu) ? "AMSDU on" : ""); 3742 } 3743 desc += sprintf(buff+desc, "last tx rate=0x%X\n", 3744 lq_sta->last_rate_n_flags); 3745 desc += sprintf(buff+desc, 3746 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n", 3747 lq_sta->lq.flags, 3748 lq_sta->lq.mimo_delim, 3749 lq_sta->lq.single_stream_ant_msk, 3750 lq_sta->lq.dual_stream_ant_msk); 3751 3752 desc += sprintf(buff+desc, 3753 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n", 3754 le16_to_cpu(lq_sta->lq.agg_time_limit), 3755 lq_sta->lq.agg_disable_start_th, 3756 lq_sta->lq.agg_frame_cnt_limit); 3757 3758 desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc); 3759 ss_params = le32_to_cpu(lq_sta->lq.ss_params); 3760 desc += sprintf(buff+desc, "single stream params: %s%s%s%s\n", 3761 (ss_params & LQ_SS_PARAMS_VALID) ? 3762 "VALID" : "INVALID", 3763 (ss_params & LQ_SS_BFER_ALLOWED) ? 3764 ", BFER" : "", 3765 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ? 3766 ", STBC" : "", 3767 (ss_params & LQ_SS_FORCE) ? 3768 ", FORCE" : ""); 3769 desc += sprintf(buff+desc, 3770 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n", 3771 lq_sta->lq.initial_rate_index[0], 3772 lq_sta->lq.initial_rate_index[1], 3773 lq_sta->lq.initial_rate_index[2], 3774 lq_sta->lq.initial_rate_index[3]); 3775 3776 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) { 3777 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]); 3778 3779 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r); 3780 desc += rs_pretty_print_rate(buff+desc, r); 3781 } 3782 3783 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3784 kfree(buff); 3785 return ret; 3786 } 3787 3788 static const struct file_operations rs_sta_dbgfs_scale_table_ops = { 3789 .write = rs_sta_dbgfs_scale_table_write, 3790 .read = rs_sta_dbgfs_scale_table_read, 3791 .open = simple_open, 3792 .llseek = default_llseek, 3793 }; 3794 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file, 3795 char __user *user_buf, size_t count, loff_t *ppos) 3796 { 3797 char *buff; 3798 int desc = 0; 3799 int i, j; 3800 ssize_t ret; 3801 struct iwl_scale_tbl_info *tbl; 3802 struct rs_rate *rate; 3803 struct iwl_lq_sta *lq_sta = file->private_data; 3804 3805 buff = kmalloc(1024, GFP_KERNEL); 3806 if (!buff) 3807 return -ENOMEM; 3808 3809 for (i = 0; i < LQ_SIZE; i++) { 3810 tbl = &(lq_sta->lq_info[i]); 3811 rate = &tbl->rate; 3812 desc += sprintf(buff+desc, 3813 "%s type=%d SGI=%d BW=%s DUP=0\n" 3814 "index=%d\n", 3815 lq_sta->active_tbl == i ? "*" : "x", 3816 rate->type, 3817 rate->sgi, 3818 is_ht20(rate) ? "20MHz" : 3819 is_ht40(rate) ? "40MHz" : 3820 is_ht80(rate) ? "80MHz" : 3821 is_ht160(rate) ? "160MHz" : "ERR", 3822 rate->index); 3823 for (j = 0; j < IWL_RATE_COUNT; j++) { 3824 desc += sprintf(buff+desc, 3825 "counter=%d success=%d %%=%d\n", 3826 tbl->win[j].counter, 3827 tbl->win[j].success_counter, 3828 tbl->win[j].success_ratio); 3829 } 3830 } 3831 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3832 kfree(buff); 3833 return ret; 3834 } 3835 3836 static const struct file_operations rs_sta_dbgfs_stats_table_ops = { 3837 .read = rs_sta_dbgfs_stats_table_read, 3838 .open = simple_open, 3839 .llseek = default_llseek, 3840 }; 3841 3842 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file, 3843 char __user *user_buf, 3844 size_t count, loff_t *ppos) 3845 { 3846 static const char * const column_name[] = { 3847 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A", 3848 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B", 3849 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A", 3850 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B", 3851 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI", 3852 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI", 3853 [RS_COLUMN_MIMO2] = "MIMO2", 3854 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI", 3855 }; 3856 3857 static const char * const rate_name[] = { 3858 [IWL_RATE_1M_INDEX] = "1M", 3859 [IWL_RATE_2M_INDEX] = "2M", 3860 [IWL_RATE_5M_INDEX] = "5.5M", 3861 [IWL_RATE_11M_INDEX] = "11M", 3862 [IWL_RATE_6M_INDEX] = "6M|MCS0", 3863 [IWL_RATE_9M_INDEX] = "9M", 3864 [IWL_RATE_12M_INDEX] = "12M|MCS1", 3865 [IWL_RATE_18M_INDEX] = "18M|MCS2", 3866 [IWL_RATE_24M_INDEX] = "24M|MCS3", 3867 [IWL_RATE_36M_INDEX] = "36M|MCS4", 3868 [IWL_RATE_48M_INDEX] = "48M|MCS5", 3869 [IWL_RATE_54M_INDEX] = "54M|MCS6", 3870 [IWL_RATE_MCS_7_INDEX] = "MCS7", 3871 [IWL_RATE_MCS_8_INDEX] = "MCS8", 3872 [IWL_RATE_MCS_9_INDEX] = "MCS9", 3873 }; 3874 3875 char *buff, *pos, *endpos; 3876 int col, rate; 3877 ssize_t ret; 3878 struct iwl_lq_sta *lq_sta = file->private_data; 3879 struct rs_rate_stats *stats; 3880 static const size_t bufsz = 1024; 3881 3882 buff = kmalloc(bufsz, GFP_KERNEL); 3883 if (!buff) 3884 return -ENOMEM; 3885 3886 pos = buff; 3887 endpos = pos + bufsz; 3888 3889 pos += scnprintf(pos, endpos - pos, "COLUMN,"); 3890 for (rate = 0; rate < IWL_RATE_COUNT; rate++) 3891 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]); 3892 pos += scnprintf(pos, endpos - pos, "\n"); 3893 3894 for (col = 0; col < RS_COLUMN_COUNT; col++) { 3895 pos += scnprintf(pos, endpos - pos, 3896 "%s,", column_name[col]); 3897 3898 for (rate = 0; rate < IWL_RATE_COUNT; rate++) { 3899 stats = &(lq_sta->pers.tx_stats[col][rate]); 3900 pos += scnprintf(pos, endpos - pos, 3901 "%llu/%llu,", 3902 stats->success, 3903 stats->total); 3904 } 3905 pos += scnprintf(pos, endpos - pos, "\n"); 3906 } 3907 3908 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff); 3909 kfree(buff); 3910 return ret; 3911 } 3912 3913 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file, 3914 const char __user *user_buf, 3915 size_t count, loff_t *ppos) 3916 { 3917 struct iwl_lq_sta *lq_sta = file->private_data; 3918 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats)); 3919 3920 return count; 3921 } 3922 3923 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = { 3924 .read = rs_sta_dbgfs_drv_tx_stats_read, 3925 .write = rs_sta_dbgfs_drv_tx_stats_write, 3926 .open = simple_open, 3927 .llseek = default_llseek, 3928 }; 3929 3930 static ssize_t iwl_dbgfs_ss_force_read(struct file *file, 3931 char __user *user_buf, 3932 size_t count, loff_t *ppos) 3933 { 3934 struct iwl_lq_sta *lq_sta = file->private_data; 3935 char buf[12]; 3936 int bufsz = sizeof(buf); 3937 int pos = 0; 3938 static const char * const ss_force_name[] = { 3939 [RS_SS_FORCE_NONE] = "none", 3940 [RS_SS_FORCE_STBC] = "stbc", 3941 [RS_SS_FORCE_BFER] = "bfer", 3942 [RS_SS_FORCE_SISO] = "siso", 3943 }; 3944 3945 pos += scnprintf(buf+pos, bufsz-pos, "%s\n", 3946 ss_force_name[lq_sta->pers.ss_force]); 3947 return simple_read_from_buffer(user_buf, count, ppos, buf, pos); 3948 } 3949 3950 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf, 3951 size_t count, loff_t *ppos) 3952 { 3953 struct iwl_mvm *mvm = lq_sta->pers.drv; 3954 int ret = 0; 3955 3956 if (!strncmp("none", buf, 4)) { 3957 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 3958 } else if (!strncmp("siso", buf, 4)) { 3959 lq_sta->pers.ss_force = RS_SS_FORCE_SISO; 3960 } else if (!strncmp("stbc", buf, 4)) { 3961 if (lq_sta->stbc_capable) { 3962 lq_sta->pers.ss_force = RS_SS_FORCE_STBC; 3963 } else { 3964 IWL_ERR(mvm, 3965 "can't force STBC. peer doesn't support\n"); 3966 ret = -EINVAL; 3967 } 3968 } else if (!strncmp("bfer", buf, 4)) { 3969 if (lq_sta->bfer_capable) { 3970 lq_sta->pers.ss_force = RS_SS_FORCE_BFER; 3971 } else { 3972 IWL_ERR(mvm, 3973 "can't force BFER. peer doesn't support\n"); 3974 ret = -EINVAL; 3975 } 3976 } else { 3977 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n"); 3978 ret = -EINVAL; 3979 } 3980 return ret ?: count; 3981 } 3982 3983 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \ 3984 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta) 3985 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \ 3986 if (!debugfs_create_file(#name, mode, parent, lq_sta, \ 3987 &iwl_dbgfs_##name##_ops)) \ 3988 goto err; \ 3989 } while (0) 3990 3991 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32); 3992 3993 static void rs_add_debugfs(void *mvm, void *priv_sta, struct dentry *dir) 3994 { 3995 struct iwl_lq_sta *lq_sta = priv_sta; 3996 struct iwl_mvm_sta *mvmsta; 3997 3998 mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta); 3999 4000 if (!mvmsta->vif) 4001 return; 4002 4003 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir, 4004 lq_sta, &rs_sta_dbgfs_scale_table_ops); 4005 debugfs_create_file("rate_stats_table", S_IRUSR, dir, 4006 lq_sta, &rs_sta_dbgfs_stats_table_ops); 4007 debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir, 4008 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops); 4009 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir, 4010 &lq_sta->tx_agg_tid_en); 4011 debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir, 4012 &lq_sta->pers.dbg_fixed_txp_reduction); 4013 4014 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR); 4015 return; 4016 err: 4017 IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n"); 4018 } 4019 4020 static void rs_remove_debugfs(void *mvm, void *mvm_sta) 4021 { 4022 } 4023 #endif 4024 4025 /* 4026 * Initialization of rate scaling information is done by driver after 4027 * the station is added. Since mac80211 calls this function before a 4028 * station is added we ignore it. 4029 */ 4030 static void rs_rate_init_stub(void *mvm_r, 4031 struct ieee80211_supported_band *sband, 4032 struct cfg80211_chan_def *chandef, 4033 struct ieee80211_sta *sta, void *mvm_sta) 4034 { 4035 } 4036 4037 static const struct rate_control_ops rs_mvm_ops = { 4038 .name = RS_NAME, 4039 .tx_status = rs_mac80211_tx_status, 4040 .get_rate = rs_get_rate, 4041 .rate_init = rs_rate_init_stub, 4042 .alloc = rs_alloc, 4043 .free = rs_free, 4044 .alloc_sta = rs_alloc_sta, 4045 .free_sta = rs_free_sta, 4046 .rate_update = rs_rate_update, 4047 #ifdef CONFIG_MAC80211_DEBUGFS 4048 .add_sta_debugfs = rs_add_debugfs, 4049 .remove_sta_debugfs = rs_remove_debugfs, 4050 #endif 4051 }; 4052 4053 int iwl_mvm_rate_control_register(void) 4054 { 4055 return ieee80211_rate_control_register(&rs_mvm_ops); 4056 } 4057 4058 void iwl_mvm_rate_control_unregister(void) 4059 { 4060 ieee80211_rate_control_unregister(&rs_mvm_ops); 4061 } 4062 4063 /** 4064 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable 4065 * Tx protection, according to this request and previous requests, 4066 * and send the LQ command. 4067 * @mvmsta: The station 4068 * @enable: Enable Tx protection? 4069 */ 4070 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 4071 bool enable) 4072 { 4073 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq; 4074 4075 lockdep_assert_held(&mvm->mutex); 4076 4077 if (enable) { 4078 if (mvmsta->tx_protection == 0) 4079 lq->flags |= LQ_FLAG_USE_RTS_MSK; 4080 mvmsta->tx_protection++; 4081 } else { 4082 mvmsta->tx_protection--; 4083 if (mvmsta->tx_protection == 0) 4084 lq->flags &= ~LQ_FLAG_USE_RTS_MSK; 4085 } 4086 4087 return iwl_mvm_send_lq_cmd(mvm, lq, false); 4088 } 4089