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 Intel Deutschland GmbH 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of version 2 of the GNU General Public License as 9 * published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 14 * more details. 15 * 16 * You should have received a copy of the GNU General Public License along with 17 * this program; if not, write to the Free Software Foundation, Inc., 18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA 19 * 20 * The full GNU General Public License is included in this distribution in the 21 * file called LICENSE. 22 * 23 * Contact Information: 24 * Intel Linux Wireless <linuxwifi@intel.com> 25 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 26 * 27 *****************************************************************************/ 28 #include <linux/kernel.h> 29 #include <linux/skbuff.h> 30 #include <linux/slab.h> 31 #include <net/mac80211.h> 32 33 #include <linux/netdevice.h> 34 #include <linux/etherdevice.h> 35 #include <linux/delay.h> 36 37 #include <linux/workqueue.h> 38 #include "rs.h" 39 #include "fw-api.h" 40 #include "sta.h" 41 #include "iwl-op-mode.h" 42 #include "mvm.h" 43 #include "debugfs.h" 44 45 #define RS_NAME "iwl-mvm-rs" 46 47 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */ 48 49 /* Calculations of success ratio are done in fixed point where 12800 is 100%. 50 * Use this macro when dealing with thresholds consts set as a percentage 51 */ 52 #define RS_PERCENT(x) (128 * x) 53 54 static u8 rs_ht_to_legacy[] = { 55 [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX, 56 [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX, 57 [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX, 58 [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX, 59 [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX, 60 [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX, 61 [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX, 62 [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX, 63 [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX, 64 [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX, 65 }; 66 67 static const u8 ant_toggle_lookup[] = { 68 [ANT_NONE] = ANT_NONE, 69 [ANT_A] = ANT_B, 70 [ANT_B] = ANT_C, 71 [ANT_AB] = ANT_BC, 72 [ANT_C] = ANT_A, 73 [ANT_AC] = ANT_AB, 74 [ANT_BC] = ANT_AC, 75 [ANT_ABC] = ANT_ABC, 76 }; 77 78 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \ 79 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \ 80 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \ 81 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \ 82 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \ 83 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\ 84 IWL_RATE_##rp##M_INDEX, \ 85 IWL_RATE_##rn##M_INDEX } 86 87 #define IWL_DECLARE_MCS_RATE(s) \ 88 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \ 89 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \ 90 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \ 91 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \ 92 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \ 93 IWL_RATE_INVM_INDEX, \ 94 IWL_RATE_INVM_INDEX } 95 96 /* 97 * Parameter order: 98 * rate, ht rate, prev rate, next rate 99 * 100 * If there isn't a valid next or previous rate then INV is used which 101 * maps to IWL_RATE_INVALID 102 * 103 */ 104 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = { 105 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */ 106 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */ 107 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */ 108 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */ 109 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */ 110 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */ 111 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */ 112 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */ 113 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */ 114 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */ 115 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */ 116 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */ 117 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */ 118 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */ 119 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */ 120 }; 121 122 enum rs_action { 123 RS_ACTION_STAY = 0, 124 RS_ACTION_DOWNSCALE = -1, 125 RS_ACTION_UPSCALE = 1, 126 }; 127 128 enum rs_column_mode { 129 RS_INVALID = 0, 130 RS_LEGACY, 131 RS_SISO, 132 RS_MIMO2, 133 }; 134 135 #define MAX_NEXT_COLUMNS 7 136 #define MAX_COLUMN_CHECKS 3 137 138 struct rs_tx_column; 139 140 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm, 141 struct ieee80211_sta *sta, 142 struct rs_rate *rate, 143 const struct rs_tx_column *next_col); 144 145 struct rs_tx_column { 146 enum rs_column_mode mode; 147 u8 ant; 148 bool sgi; 149 enum rs_column next_columns[MAX_NEXT_COLUMNS]; 150 allow_column_func_t checks[MAX_COLUMN_CHECKS]; 151 }; 152 153 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 154 struct rs_rate *rate, 155 const struct rs_tx_column *next_col) 156 { 157 return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant); 158 } 159 160 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 161 struct rs_rate *rate, 162 const struct rs_tx_column *next_col) 163 { 164 if (!sta->ht_cap.ht_supported) 165 return false; 166 167 if (sta->smps_mode == IEEE80211_SMPS_STATIC) 168 return false; 169 170 if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2) 171 return false; 172 173 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 174 return false; 175 176 if (mvm->nvm_data->sku_cap_mimo_disabled) 177 return false; 178 179 return true; 180 } 181 182 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 183 struct rs_rate *rate, 184 const struct rs_tx_column *next_col) 185 { 186 if (!sta->ht_cap.ht_supported) 187 return false; 188 189 return true; 190 } 191 192 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 193 struct rs_rate *rate, 194 const struct rs_tx_column *next_col) 195 { 196 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 197 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; 198 199 if (is_ht20(rate) && (ht_cap->cap & 200 IEEE80211_HT_CAP_SGI_20)) 201 return true; 202 if (is_ht40(rate) && (ht_cap->cap & 203 IEEE80211_HT_CAP_SGI_40)) 204 return true; 205 if (is_ht80(rate) && (vht_cap->cap & 206 IEEE80211_VHT_CAP_SHORT_GI_80)) 207 return true; 208 if (is_ht160(rate) && (vht_cap->cap & 209 IEEE80211_VHT_CAP_SHORT_GI_160)) 210 return true; 211 212 return false; 213 } 214 215 static const struct rs_tx_column rs_tx_columns[] = { 216 [RS_COLUMN_LEGACY_ANT_A] = { 217 .mode = RS_LEGACY, 218 .ant = ANT_A, 219 .next_columns = { 220 RS_COLUMN_LEGACY_ANT_B, 221 RS_COLUMN_SISO_ANT_A, 222 RS_COLUMN_MIMO2, 223 RS_COLUMN_INVALID, 224 RS_COLUMN_INVALID, 225 RS_COLUMN_INVALID, 226 RS_COLUMN_INVALID, 227 }, 228 .checks = { 229 rs_ant_allow, 230 }, 231 }, 232 [RS_COLUMN_LEGACY_ANT_B] = { 233 .mode = RS_LEGACY, 234 .ant = ANT_B, 235 .next_columns = { 236 RS_COLUMN_LEGACY_ANT_A, 237 RS_COLUMN_SISO_ANT_B, 238 RS_COLUMN_MIMO2, 239 RS_COLUMN_INVALID, 240 RS_COLUMN_INVALID, 241 RS_COLUMN_INVALID, 242 RS_COLUMN_INVALID, 243 }, 244 .checks = { 245 rs_ant_allow, 246 }, 247 }, 248 [RS_COLUMN_SISO_ANT_A] = { 249 .mode = RS_SISO, 250 .ant = ANT_A, 251 .next_columns = { 252 RS_COLUMN_SISO_ANT_B, 253 RS_COLUMN_MIMO2, 254 RS_COLUMN_SISO_ANT_A_SGI, 255 RS_COLUMN_LEGACY_ANT_A, 256 RS_COLUMN_LEGACY_ANT_B, 257 RS_COLUMN_INVALID, 258 RS_COLUMN_INVALID, 259 }, 260 .checks = { 261 rs_siso_allow, 262 rs_ant_allow, 263 }, 264 }, 265 [RS_COLUMN_SISO_ANT_B] = { 266 .mode = RS_SISO, 267 .ant = ANT_B, 268 .next_columns = { 269 RS_COLUMN_SISO_ANT_A, 270 RS_COLUMN_MIMO2, 271 RS_COLUMN_SISO_ANT_B_SGI, 272 RS_COLUMN_LEGACY_ANT_A, 273 RS_COLUMN_LEGACY_ANT_B, 274 RS_COLUMN_INVALID, 275 RS_COLUMN_INVALID, 276 }, 277 .checks = { 278 rs_siso_allow, 279 rs_ant_allow, 280 }, 281 }, 282 [RS_COLUMN_SISO_ANT_A_SGI] = { 283 .mode = RS_SISO, 284 .ant = ANT_A, 285 .sgi = true, 286 .next_columns = { 287 RS_COLUMN_SISO_ANT_B_SGI, 288 RS_COLUMN_MIMO2_SGI, 289 RS_COLUMN_SISO_ANT_A, 290 RS_COLUMN_LEGACY_ANT_A, 291 RS_COLUMN_LEGACY_ANT_B, 292 RS_COLUMN_INVALID, 293 RS_COLUMN_INVALID, 294 }, 295 .checks = { 296 rs_siso_allow, 297 rs_ant_allow, 298 rs_sgi_allow, 299 }, 300 }, 301 [RS_COLUMN_SISO_ANT_B_SGI] = { 302 .mode = RS_SISO, 303 .ant = ANT_B, 304 .sgi = true, 305 .next_columns = { 306 RS_COLUMN_SISO_ANT_A_SGI, 307 RS_COLUMN_MIMO2_SGI, 308 RS_COLUMN_SISO_ANT_B, 309 RS_COLUMN_LEGACY_ANT_A, 310 RS_COLUMN_LEGACY_ANT_B, 311 RS_COLUMN_INVALID, 312 RS_COLUMN_INVALID, 313 }, 314 .checks = { 315 rs_siso_allow, 316 rs_ant_allow, 317 rs_sgi_allow, 318 }, 319 }, 320 [RS_COLUMN_MIMO2] = { 321 .mode = RS_MIMO2, 322 .ant = ANT_AB, 323 .next_columns = { 324 RS_COLUMN_SISO_ANT_A, 325 RS_COLUMN_MIMO2_SGI, 326 RS_COLUMN_LEGACY_ANT_A, 327 RS_COLUMN_LEGACY_ANT_B, 328 RS_COLUMN_INVALID, 329 RS_COLUMN_INVALID, 330 RS_COLUMN_INVALID, 331 }, 332 .checks = { 333 rs_mimo_allow, 334 }, 335 }, 336 [RS_COLUMN_MIMO2_SGI] = { 337 .mode = RS_MIMO2, 338 .ant = ANT_AB, 339 .sgi = true, 340 .next_columns = { 341 RS_COLUMN_SISO_ANT_A_SGI, 342 RS_COLUMN_MIMO2, 343 RS_COLUMN_LEGACY_ANT_A, 344 RS_COLUMN_LEGACY_ANT_B, 345 RS_COLUMN_INVALID, 346 RS_COLUMN_INVALID, 347 RS_COLUMN_INVALID, 348 }, 349 .checks = { 350 rs_mimo_allow, 351 rs_sgi_allow, 352 }, 353 }, 354 }; 355 356 static inline u8 rs_extract_rate(u32 rate_n_flags) 357 { 358 /* also works for HT because bits 7:6 are zero there */ 359 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK); 360 } 361 362 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags) 363 { 364 int idx = 0; 365 366 if (rate_n_flags & RATE_MCS_HT_MSK) { 367 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK; 368 idx += IWL_RATE_MCS_0_INDEX; 369 370 /* skip 9M not supported in HT*/ 371 if (idx >= IWL_RATE_9M_INDEX) 372 idx += 1; 373 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE)) 374 return idx; 375 } else if (rate_n_flags & RATE_MCS_VHT_MSK) { 376 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK; 377 idx += IWL_RATE_MCS_0_INDEX; 378 379 /* skip 9M not supported in VHT*/ 380 if (idx >= IWL_RATE_9M_INDEX) 381 idx++; 382 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE)) 383 return idx; 384 } else { 385 /* legacy rate format, search for match in table */ 386 387 u8 legacy_rate = rs_extract_rate(rate_n_flags); 388 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++) 389 if (iwl_rates[idx].plcp == legacy_rate) 390 return idx; 391 } 392 393 return IWL_RATE_INVALID; 394 } 395 396 static void rs_rate_scale_perform(struct iwl_mvm *mvm, 397 struct ieee80211_sta *sta, 398 struct iwl_lq_sta *lq_sta, 399 int tid, bool ndp); 400 static void rs_fill_lq_cmd(struct iwl_mvm *mvm, 401 struct ieee80211_sta *sta, 402 struct iwl_lq_sta *lq_sta, 403 const struct rs_rate *initial_rate); 404 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search); 405 406 /** 407 * The following tables contain the expected throughput metrics for all rates 408 * 409 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits 410 * 411 * where invalid entries are zeros. 412 * 413 * CCK rates are only valid in legacy table and will only be used in G 414 * (2.4 GHz) band. 415 */ 416 417 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = { 418 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0 419 }; 420 421 /* Expected TpT tables. 4 indexes: 422 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI 423 */ 424 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = { 425 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0}, 426 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0}, 427 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0}, 428 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0}, 429 }; 430 431 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = { 432 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275}, 433 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280}, 434 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173}, 435 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284}, 436 }; 437 438 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = { 439 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308}, 440 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312}, 441 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466}, 442 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691}, 443 }; 444 445 static const u16 expected_tpt_siso_160MHz[4][IWL_RATE_COUNT] = { 446 {0, 0, 0, 0, 191, 0, 244, 288, 298, 308, 313, 318, 323, 328, 330}, 447 {0, 0, 0, 0, 200, 0, 251, 293, 302, 312, 317, 322, 327, 332, 334}, 448 {0, 0, 0, 0, 439, 0, 875, 1307, 1736, 2584, 3419, 3831, 4240, 5049, 5581}, 449 {0, 0, 0, 0, 488, 0, 972, 1451, 1925, 2864, 3785, 4240, 4691, 5581, 6165}, 450 }; 451 452 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = { 453 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0}, 454 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0}, 455 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0}, 456 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0}, 457 }; 458 459 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = { 460 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300}, 461 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303}, 462 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053}, 463 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221}, 464 }; 465 466 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = { 467 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319}, 468 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320}, 469 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219}, 470 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545}, 471 }; 472 473 static const u16 expected_tpt_mimo2_160MHz[4][IWL_RATE_COUNT] = { 474 {0, 0, 0, 0, 240, 0, 278, 308, 313, 319, 322, 324, 328, 330, 334}, 475 {0, 0, 0, 0, 247, 0, 282, 310, 315, 320, 323, 325, 329, 332, 338}, 476 {0, 0, 0, 0, 875, 0, 1735, 2582, 3414, 5043, 6619, 7389, 8147, 9629, 10592}, 477 {0, 0, 0, 0, 971, 0, 1925, 2861, 3779, 5574, 7304, 8147, 8976, 10592, 11640}, 478 }; 479 480 /* mbps, mcs */ 481 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = { 482 { "1", "BPSK DSSS"}, 483 { "2", "QPSK DSSS"}, 484 {"5.5", "BPSK CCK"}, 485 { "11", "QPSK CCK"}, 486 { "6", "BPSK 1/2"}, 487 { "9", "BPSK 1/2"}, 488 { "12", "QPSK 1/2"}, 489 { "18", "QPSK 3/4"}, 490 { "24", "16QAM 1/2"}, 491 { "36", "16QAM 3/4"}, 492 { "48", "64QAM 2/3"}, 493 { "54", "64QAM 3/4"}, 494 { "60", "64QAM 5/6"}, 495 }; 496 497 #define MCS_INDEX_PER_STREAM (8) 498 499 static const char *rs_pretty_ant(u8 ant) 500 { 501 static const char * const ant_name[] = { 502 [ANT_NONE] = "None", 503 [ANT_A] = "A", 504 [ANT_B] = "B", 505 [ANT_AB] = "AB", 506 [ANT_C] = "C", 507 [ANT_AC] = "AC", 508 [ANT_BC] = "BC", 509 [ANT_ABC] = "ABC", 510 }; 511 512 if (ant > ANT_ABC) 513 return "UNKNOWN"; 514 515 return ant_name[ant]; 516 } 517 518 static const char *rs_pretty_lq_type(enum iwl_table_type type) 519 { 520 static const char * const lq_types[] = { 521 [LQ_NONE] = "NONE", 522 [LQ_LEGACY_A] = "LEGACY_A", 523 [LQ_LEGACY_G] = "LEGACY_G", 524 [LQ_HT_SISO] = "HT SISO", 525 [LQ_HT_MIMO2] = "HT MIMO", 526 [LQ_VHT_SISO] = "VHT SISO", 527 [LQ_VHT_MIMO2] = "VHT MIMO", 528 }; 529 530 if (type < LQ_NONE || type >= LQ_MAX) 531 return "UNKNOWN"; 532 533 return lq_types[type]; 534 } 535 536 static char *rs_pretty_rate(const struct rs_rate *rate) 537 { 538 static char buf[40]; 539 static const char * const legacy_rates[] = { 540 [IWL_RATE_1M_INDEX] = "1M", 541 [IWL_RATE_2M_INDEX] = "2M", 542 [IWL_RATE_5M_INDEX] = "5.5M", 543 [IWL_RATE_11M_INDEX] = "11M", 544 [IWL_RATE_6M_INDEX] = "6M", 545 [IWL_RATE_9M_INDEX] = "9M", 546 [IWL_RATE_12M_INDEX] = "12M", 547 [IWL_RATE_18M_INDEX] = "18M", 548 [IWL_RATE_24M_INDEX] = "24M", 549 [IWL_RATE_36M_INDEX] = "36M", 550 [IWL_RATE_48M_INDEX] = "48M", 551 [IWL_RATE_54M_INDEX] = "54M", 552 }; 553 static const char *const ht_vht_rates[] = { 554 [IWL_RATE_MCS_0_INDEX] = "MCS0", 555 [IWL_RATE_MCS_1_INDEX] = "MCS1", 556 [IWL_RATE_MCS_2_INDEX] = "MCS2", 557 [IWL_RATE_MCS_3_INDEX] = "MCS3", 558 [IWL_RATE_MCS_4_INDEX] = "MCS4", 559 [IWL_RATE_MCS_5_INDEX] = "MCS5", 560 [IWL_RATE_MCS_6_INDEX] = "MCS6", 561 [IWL_RATE_MCS_7_INDEX] = "MCS7", 562 [IWL_RATE_MCS_8_INDEX] = "MCS8", 563 [IWL_RATE_MCS_9_INDEX] = "MCS9", 564 }; 565 const char *rate_str; 566 567 if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX)) 568 rate_str = legacy_rates[rate->index]; 569 else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) && 570 (rate->index >= IWL_RATE_MCS_0_INDEX) && 571 (rate->index <= IWL_RATE_MCS_9_INDEX)) 572 rate_str = ht_vht_rates[rate->index]; 573 else 574 rate_str = "BAD_RATE"; 575 576 sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type), 577 rs_pretty_ant(rate->ant), rate_str); 578 return buf; 579 } 580 581 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate, 582 const char *prefix) 583 { 584 IWL_DEBUG_RATE(mvm, 585 "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n", 586 prefix, rs_pretty_rate(rate), rate->bw, 587 rate->sgi, rate->ldpc, rate->stbc); 588 } 589 590 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window) 591 { 592 window->data = 0; 593 window->success_counter = 0; 594 window->success_ratio = IWL_INVALID_VALUE; 595 window->counter = 0; 596 window->average_tpt = IWL_INVALID_VALUE; 597 } 598 599 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm, 600 struct iwl_scale_tbl_info *tbl) 601 { 602 int i; 603 604 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n"); 605 for (i = 0; i < IWL_RATE_COUNT; i++) 606 rs_rate_scale_clear_window(&tbl->win[i]); 607 608 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++) 609 rs_rate_scale_clear_window(&tbl->tpc_win[i]); 610 } 611 612 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type) 613 { 614 return (ant_type & valid_antenna) == ant_type; 615 } 616 617 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm, 618 struct iwl_lq_sta *lq_data, u8 tid, 619 struct ieee80211_sta *sta) 620 { 621 int ret = -EAGAIN; 622 623 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n", 624 sta->addr, tid); 625 ret = ieee80211_start_tx_ba_session(sta, tid, 5000); 626 if (ret == -EAGAIN) { 627 /* 628 * driver and mac80211 is out of sync 629 * this might be cause by reloading firmware 630 * stop the tx ba session here 631 */ 632 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n", 633 tid); 634 ieee80211_stop_tx_ba_session(sta, tid); 635 } 636 return ret; 637 } 638 639 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid, 640 struct iwl_lq_sta *lq_data, 641 struct ieee80211_sta *sta) 642 { 643 if (tid < IWL_MAX_TID_COUNT) 644 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta); 645 else 646 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n", 647 tid, IWL_MAX_TID_COUNT); 648 } 649 650 static inline int get_num_of_ant_from_rate(u32 rate_n_flags) 651 { 652 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) + 653 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) + 654 !!(rate_n_flags & RATE_MCS_ANT_C_MSK); 655 } 656 657 /* 658 * Static function to get the expected throughput from an iwl_scale_tbl_info 659 * that wraps a NULL pointer check 660 */ 661 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index) 662 { 663 if (tbl->expected_tpt) 664 return tbl->expected_tpt[rs_index]; 665 return 0; 666 } 667 668 /** 669 * rs_collect_tx_data - Update the success/failure sliding window 670 * 671 * We keep a sliding window of the last 62 packets transmitted 672 * at this rate. window->data contains the bitmask of successful 673 * packets. 674 */ 675 static int _rs_collect_tx_data(struct iwl_mvm *mvm, 676 struct iwl_scale_tbl_info *tbl, 677 int scale_index, int attempts, int successes, 678 struct iwl_rate_scale_data *window) 679 { 680 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1)); 681 s32 fail_count, tpt; 682 683 /* Get expected throughput */ 684 tpt = get_expected_tpt(tbl, scale_index); 685 686 /* 687 * Keep track of only the latest 62 tx frame attempts in this rate's 688 * history window; anything older isn't really relevant any more. 689 * If we have filled up the sliding window, drop the oldest attempt; 690 * if the oldest attempt (highest bit in bitmap) shows "success", 691 * subtract "1" from the success counter (this is the main reason 692 * we keep these bitmaps!). 693 */ 694 while (attempts > 0) { 695 if (window->counter >= IWL_RATE_MAX_WINDOW) { 696 /* remove earliest */ 697 window->counter = IWL_RATE_MAX_WINDOW - 1; 698 699 if (window->data & mask) { 700 window->data &= ~mask; 701 window->success_counter--; 702 } 703 } 704 705 /* Increment frames-attempted counter */ 706 window->counter++; 707 708 /* Shift bitmap by one frame to throw away oldest history */ 709 window->data <<= 1; 710 711 /* Mark the most recent #successes attempts as successful */ 712 if (successes > 0) { 713 window->success_counter++; 714 window->data |= 0x1; 715 successes--; 716 } 717 718 attempts--; 719 } 720 721 /* Calculate current success ratio, avoid divide-by-0! */ 722 if (window->counter > 0) 723 window->success_ratio = 128 * (100 * window->success_counter) 724 / window->counter; 725 else 726 window->success_ratio = IWL_INVALID_VALUE; 727 728 fail_count = window->counter - window->success_counter; 729 730 /* Calculate average throughput, if we have enough history. */ 731 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) || 732 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) 733 window->average_tpt = (window->success_ratio * tpt + 64) / 128; 734 else 735 window->average_tpt = IWL_INVALID_VALUE; 736 737 return 0; 738 } 739 740 static int rs_collect_tpc_data(struct iwl_mvm *mvm, 741 struct iwl_lq_sta *lq_sta, 742 struct iwl_scale_tbl_info *tbl, 743 int scale_index, int attempts, int successes, 744 u8 reduced_txp) 745 { 746 struct iwl_rate_scale_data *window = NULL; 747 748 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION)) 749 return -EINVAL; 750 751 window = &tbl->tpc_win[reduced_txp]; 752 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes, 753 window); 754 } 755 756 static int rs_collect_tlc_data(struct iwl_mvm *mvm, 757 struct iwl_lq_sta *lq_sta, 758 struct iwl_scale_tbl_info *tbl, 759 int scale_index, int attempts, int successes) 760 { 761 struct iwl_rate_scale_data *window = NULL; 762 763 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT) 764 return -EINVAL; 765 766 if (tbl->column != RS_COLUMN_INVALID) { 767 struct lq_sta_pers *pers = &lq_sta->pers; 768 769 pers->tx_stats[tbl->column][scale_index].total += attempts; 770 pers->tx_stats[tbl->column][scale_index].success += successes; 771 } 772 773 /* Select window for current tx bit rate */ 774 window = &(tbl->win[scale_index]); 775 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes, 776 window); 777 } 778 779 /* Convert rs_rate object into ucode rate bitmask */ 780 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm, 781 struct rs_rate *rate) 782 { 783 u32 ucode_rate = 0; 784 int index = rate->index; 785 786 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) & 787 RATE_MCS_ANT_ABC_MSK); 788 789 if (is_legacy(rate)) { 790 ucode_rate |= iwl_rates[index].plcp; 791 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE) 792 ucode_rate |= RATE_MCS_CCK_MSK; 793 return ucode_rate; 794 } 795 796 if (is_ht(rate)) { 797 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) { 798 IWL_ERR(mvm, "Invalid HT rate index %d\n", index); 799 index = IWL_LAST_HT_RATE; 800 } 801 ucode_rate |= RATE_MCS_HT_MSK; 802 803 if (is_ht_siso(rate)) 804 ucode_rate |= iwl_rates[index].plcp_ht_siso; 805 else if (is_ht_mimo2(rate)) 806 ucode_rate |= iwl_rates[index].plcp_ht_mimo2; 807 else 808 WARN_ON_ONCE(1); 809 } else if (is_vht(rate)) { 810 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) { 811 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index); 812 index = IWL_LAST_VHT_RATE; 813 } 814 ucode_rate |= RATE_MCS_VHT_MSK; 815 if (is_vht_siso(rate)) 816 ucode_rate |= iwl_rates[index].plcp_vht_siso; 817 else if (is_vht_mimo2(rate)) 818 ucode_rate |= iwl_rates[index].plcp_vht_mimo2; 819 else 820 WARN_ON_ONCE(1); 821 822 } else { 823 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type); 824 } 825 826 if (is_siso(rate) && rate->stbc) { 827 /* To enable STBC we need to set both a flag and ANT_AB */ 828 ucode_rate |= RATE_MCS_ANT_AB_MSK; 829 ucode_rate |= RATE_MCS_VHT_STBC_MSK; 830 } 831 832 ucode_rate |= rate->bw; 833 if (rate->sgi) 834 ucode_rate |= RATE_MCS_SGI_MSK; 835 if (rate->ldpc) 836 ucode_rate |= RATE_MCS_LDPC_MSK; 837 838 return ucode_rate; 839 } 840 841 /* Convert a ucode rate into an rs_rate object */ 842 static int rs_rate_from_ucode_rate(const u32 ucode_rate, 843 enum nl80211_band band, 844 struct rs_rate *rate) 845 { 846 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK; 847 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate); 848 u8 nss; 849 850 memset(rate, 0, sizeof(*rate)); 851 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate); 852 853 if (rate->index == IWL_RATE_INVALID) 854 return -EINVAL; 855 856 rate->ant = (ant_msk >> RATE_MCS_ANT_POS); 857 858 /* Legacy */ 859 if (!(ucode_rate & RATE_MCS_HT_MSK) && 860 !(ucode_rate & RATE_MCS_VHT_MSK)) { 861 if (num_of_ant == 1) { 862 if (band == NL80211_BAND_5GHZ) 863 rate->type = LQ_LEGACY_A; 864 else 865 rate->type = LQ_LEGACY_G; 866 } 867 868 return 0; 869 } 870 871 /* HT or VHT */ 872 if (ucode_rate & RATE_MCS_SGI_MSK) 873 rate->sgi = true; 874 if (ucode_rate & RATE_MCS_LDPC_MSK) 875 rate->ldpc = true; 876 if (ucode_rate & RATE_MCS_VHT_STBC_MSK) 877 rate->stbc = true; 878 if (ucode_rate & RATE_MCS_BF_MSK) 879 rate->bfer = true; 880 881 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK; 882 883 if (ucode_rate & RATE_MCS_HT_MSK) { 884 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >> 885 RATE_HT_MCS_NSS_POS) + 1; 886 887 if (nss == 1) { 888 rate->type = LQ_HT_SISO; 889 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 890 "stbc %d bfer %d", 891 rate->stbc, rate->bfer); 892 } else if (nss == 2) { 893 rate->type = LQ_HT_MIMO2; 894 WARN_ON_ONCE(num_of_ant != 2); 895 } else { 896 WARN_ON_ONCE(1); 897 } 898 } else if (ucode_rate & RATE_MCS_VHT_MSK) { 899 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >> 900 RATE_VHT_MCS_NSS_POS) + 1; 901 902 if (nss == 1) { 903 rate->type = LQ_VHT_SISO; 904 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 905 "stbc %d bfer %d", 906 rate->stbc, rate->bfer); 907 } else if (nss == 2) { 908 rate->type = LQ_VHT_MIMO2; 909 WARN_ON_ONCE(num_of_ant != 2); 910 } else { 911 WARN_ON_ONCE(1); 912 } 913 } 914 915 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 && 916 !is_vht(rate)); 917 918 return 0; 919 } 920 921 /* switch to another antenna/antennas and return 1 */ 922 /* if no other valid antenna found, return 0 */ 923 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate) 924 { 925 u8 new_ant_type; 926 927 if (!rate->ant || rate->ant > ANT_ABC) 928 return 0; 929 930 if (!rs_is_valid_ant(valid_ant, rate->ant)) 931 return 0; 932 933 new_ant_type = ant_toggle_lookup[rate->ant]; 934 935 while ((new_ant_type != rate->ant) && 936 !rs_is_valid_ant(valid_ant, new_ant_type)) 937 new_ant_type = ant_toggle_lookup[new_ant_type]; 938 939 if (new_ant_type == rate->ant) 940 return 0; 941 942 rate->ant = new_ant_type; 943 944 return 1; 945 } 946 947 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta, 948 struct rs_rate *rate) 949 { 950 if (is_legacy(rate)) 951 return lq_sta->active_legacy_rate; 952 else if (is_siso(rate)) 953 return lq_sta->active_siso_rate; 954 else if (is_mimo2(rate)) 955 return lq_sta->active_mimo2_rate; 956 957 WARN_ON_ONCE(1); 958 return 0; 959 } 960 961 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask, 962 int rate_type) 963 { 964 u8 high = IWL_RATE_INVALID; 965 u8 low = IWL_RATE_INVALID; 966 967 /* 802.11A or ht walks to the next literal adjacent rate in 968 * the rate table */ 969 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) { 970 int i; 971 u32 mask; 972 973 /* Find the previous rate that is in the rate mask */ 974 i = index - 1; 975 for (mask = (1 << i); i >= 0; i--, mask >>= 1) { 976 if (rate_mask & mask) { 977 low = i; 978 break; 979 } 980 } 981 982 /* Find the next rate that is in the rate mask */ 983 i = index + 1; 984 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) { 985 if (rate_mask & mask) { 986 high = i; 987 break; 988 } 989 } 990 991 return (high << 8) | low; 992 } 993 994 low = index; 995 while (low != IWL_RATE_INVALID) { 996 low = iwl_rates[low].prev_rs; 997 if (low == IWL_RATE_INVALID) 998 break; 999 if (rate_mask & (1 << low)) 1000 break; 1001 } 1002 1003 high = index; 1004 while (high != IWL_RATE_INVALID) { 1005 high = iwl_rates[high].next_rs; 1006 if (high == IWL_RATE_INVALID) 1007 break; 1008 if (rate_mask & (1 << high)) 1009 break; 1010 } 1011 1012 return (high << 8) | low; 1013 } 1014 1015 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta, 1016 struct rs_rate *rate) 1017 { 1018 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate); 1019 } 1020 1021 /* Get the next supported lower rate in the current column. 1022 * Return true if bottom rate in the current column was reached 1023 */ 1024 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta, 1025 struct rs_rate *rate) 1026 { 1027 u8 low; 1028 u16 high_low; 1029 u16 rate_mask; 1030 struct iwl_mvm *mvm = lq_sta->pers.drv; 1031 1032 rate_mask = rs_get_supported_rates(lq_sta, rate); 1033 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask, 1034 rate->type); 1035 low = high_low & 0xff; 1036 1037 /* Bottom rate of column reached */ 1038 if (low == IWL_RATE_INVALID) 1039 return true; 1040 1041 rate->index = low; 1042 return false; 1043 } 1044 1045 /* Get the next rate to use following a column downgrade */ 1046 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta, 1047 struct rs_rate *rate) 1048 { 1049 struct iwl_mvm *mvm = lq_sta->pers.drv; 1050 1051 if (is_legacy(rate)) { 1052 /* No column to downgrade from Legacy */ 1053 return; 1054 } else if (is_siso(rate)) { 1055 /* Downgrade to Legacy if we were in SISO */ 1056 if (lq_sta->band == NL80211_BAND_5GHZ) 1057 rate->type = LQ_LEGACY_A; 1058 else 1059 rate->type = LQ_LEGACY_G; 1060 1061 rate->bw = RATE_MCS_CHAN_WIDTH_20; 1062 1063 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX || 1064 rate->index > IWL_RATE_MCS_9_INDEX); 1065 1066 rate->index = rs_ht_to_legacy[rate->index]; 1067 rate->ldpc = false; 1068 } else { 1069 /* Downgrade to SISO with same MCS if in MIMO */ 1070 rate->type = is_vht_mimo2(rate) ? 1071 LQ_VHT_SISO : LQ_HT_SISO; 1072 } 1073 1074 if (num_of_ant(rate->ant) > 1) 1075 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm)); 1076 1077 /* Relevant in both switching to SISO or Legacy */ 1078 rate->sgi = false; 1079 1080 if (!rs_rate_supported(lq_sta, rate)) 1081 rs_get_lower_rate_in_column(lq_sta, rate); 1082 } 1083 1084 /* Check if both rates are identical 1085 * allow_ant_mismatch enables matching a SISO rate on ANT_A or ANT_B 1086 * with a rate indicating STBC/BFER and ANT_AB. 1087 */ 1088 static inline bool rs_rate_equal(struct rs_rate *a, 1089 struct rs_rate *b, 1090 bool allow_ant_mismatch) 1091 1092 { 1093 bool ant_match = (a->ant == b->ant) && (a->stbc == b->stbc) && 1094 (a->bfer == b->bfer); 1095 1096 if (allow_ant_mismatch) { 1097 if (a->stbc || a->bfer) { 1098 WARN_ONCE(a->ant != ANT_AB, "stbc %d bfer %d ant %d", 1099 a->stbc, a->bfer, a->ant); 1100 ant_match |= (b->ant == ANT_A || b->ant == ANT_B); 1101 } else if (b->stbc || b->bfer) { 1102 WARN_ONCE(b->ant != ANT_AB, "stbc %d bfer %d ant %d", 1103 b->stbc, b->bfer, b->ant); 1104 ant_match |= (a->ant == ANT_A || a->ant == ANT_B); 1105 } 1106 } 1107 1108 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) && 1109 (a->ldpc == b->ldpc) && (a->index == b->index) && ant_match; 1110 } 1111 1112 /* Check if both rates share the same column */ 1113 static inline bool rs_rate_column_match(struct rs_rate *a, 1114 struct rs_rate *b) 1115 { 1116 bool ant_match; 1117 1118 if (a->stbc || a->bfer) 1119 ant_match = (b->ant == ANT_A || b->ant == ANT_B); 1120 else 1121 ant_match = (a->ant == b->ant); 1122 1123 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) 1124 && ant_match; 1125 } 1126 1127 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate) 1128 { 1129 if (is_legacy(rate)) { 1130 if (rate->ant == ANT_A) 1131 return RS_COLUMN_LEGACY_ANT_A; 1132 1133 if (rate->ant == ANT_B) 1134 return RS_COLUMN_LEGACY_ANT_B; 1135 1136 goto err; 1137 } 1138 1139 if (is_siso(rate)) { 1140 if (rate->ant == ANT_A || rate->stbc || rate->bfer) 1141 return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI : 1142 RS_COLUMN_SISO_ANT_A; 1143 1144 if (rate->ant == ANT_B) 1145 return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI : 1146 RS_COLUMN_SISO_ANT_B; 1147 1148 goto err; 1149 } 1150 1151 if (is_mimo(rate)) 1152 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2; 1153 1154 err: 1155 return RS_COLUMN_INVALID; 1156 } 1157 1158 static u8 rs_get_tid(struct ieee80211_hdr *hdr) 1159 { 1160 u8 tid = IWL_MAX_TID_COUNT; 1161 1162 if (ieee80211_is_data_qos(hdr->frame_control)) { 1163 u8 *qc = ieee80211_get_qos_ctl(hdr); 1164 tid = qc[0] & 0xf; 1165 } 1166 1167 if (unlikely(tid > IWL_MAX_TID_COUNT)) 1168 tid = IWL_MAX_TID_COUNT; 1169 1170 return tid; 1171 } 1172 1173 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1174 int tid, struct ieee80211_tx_info *info, bool ndp) 1175 { 1176 int legacy_success; 1177 int retries; 1178 int i; 1179 struct iwl_lq_cmd *table; 1180 u32 lq_hwrate; 1181 struct rs_rate lq_rate, tx_resp_rate; 1182 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl; 1183 u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0]; 1184 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1]; 1185 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 1186 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta; 1187 bool allow_ant_mismatch = fw_has_api(&mvm->fw->ucode_capa, 1188 IWL_UCODE_TLV_API_LQ_SS_PARAMS); 1189 1190 /* Treat uninitialized rate scaling data same as non-existing. */ 1191 if (!lq_sta) { 1192 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n"); 1193 return; 1194 } else if (!lq_sta->pers.drv) { 1195 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n"); 1196 return; 1197 } 1198 1199 /* This packet was aggregated but doesn't carry status info */ 1200 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 1201 !(info->flags & IEEE80211_TX_STAT_AMPDU)) 1202 return; 1203 1204 rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate); 1205 1206 #ifdef CONFIG_MAC80211_DEBUGFS 1207 /* Disable last tx check if we are debugging with fixed rate but 1208 * update tx stats */ 1209 if (lq_sta->pers.dbg_fixed_rate) { 1210 int index = tx_resp_rate.index; 1211 enum rs_column column; 1212 int attempts, success; 1213 1214 column = rs_get_column_from_rate(&tx_resp_rate); 1215 if (WARN_ONCE(column == RS_COLUMN_INVALID, 1216 "Can't map rate 0x%x to column", 1217 tx_resp_hwrate)) 1218 return; 1219 1220 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 1221 attempts = info->status.ampdu_len; 1222 success = info->status.ampdu_ack_len; 1223 } else { 1224 attempts = info->status.rates[0].count; 1225 success = !!(info->flags & IEEE80211_TX_STAT_ACK); 1226 } 1227 1228 lq_sta->pers.tx_stats[column][index].total += attempts; 1229 lq_sta->pers.tx_stats[column][index].success += success; 1230 1231 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n", 1232 tx_resp_hwrate, success, attempts); 1233 return; 1234 } 1235 #endif 1236 1237 if (time_after(jiffies, 1238 (unsigned long)(lq_sta->last_tx + 1239 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) { 1240 int t; 1241 1242 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n"); 1243 for (t = 0; t < IWL_MAX_TID_COUNT; t++) 1244 ieee80211_stop_tx_ba_session(sta, t); 1245 1246 iwl_mvm_rs_rate_init(mvm, sta, info->band, false); 1247 return; 1248 } 1249 lq_sta->last_tx = jiffies; 1250 1251 /* Ignore this Tx frame response if its initial rate doesn't match 1252 * that of latest Link Quality command. There may be stragglers 1253 * from a previous Link Quality command, but we're no longer interested 1254 * in those; they're either from the "active" mode while we're trying 1255 * to check "search" mode, or a prior "search" mode after we've moved 1256 * to a new "search" mode (which might become the new "active" mode). 1257 */ 1258 table = &lq_sta->lq; 1259 lq_hwrate = le32_to_cpu(table->rs_table[0]); 1260 rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate); 1261 1262 /* Here we actually compare this rate to the latest LQ command */ 1263 if (!rs_rate_equal(&tx_resp_rate, &lq_rate, allow_ant_mismatch)) { 1264 IWL_DEBUG_RATE(mvm, 1265 "initial tx resp rate 0x%x does not match 0x%x\n", 1266 tx_resp_hwrate, lq_hwrate); 1267 1268 /* 1269 * Since rates mis-match, the last LQ command may have failed. 1270 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with 1271 * ... driver. 1272 */ 1273 lq_sta->missed_rate_counter++; 1274 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) { 1275 lq_sta->missed_rate_counter = 0; 1276 IWL_DEBUG_RATE(mvm, 1277 "Too many rates mismatch. Send sync LQ. rs_state %d\n", 1278 lq_sta->rs_state); 1279 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false); 1280 } 1281 /* Regardless, ignore this status info for outdated rate */ 1282 return; 1283 } else 1284 /* Rate did match, so reset the missed_rate_counter */ 1285 lq_sta->missed_rate_counter = 0; 1286 1287 if (!lq_sta->search_better_tbl) { 1288 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1289 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1290 } else { 1291 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1292 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1293 } 1294 1295 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) { 1296 IWL_DEBUG_RATE(mvm, 1297 "Neither active nor search matches tx rate\n"); 1298 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1299 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE"); 1300 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1301 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH"); 1302 rs_dump_rate(mvm, &lq_rate, "ACTUAL"); 1303 1304 /* 1305 * no matching table found, let's by-pass the data collection 1306 * and continue to perform rate scale to find the rate table 1307 */ 1308 rs_stay_in_table(lq_sta, true); 1309 goto done; 1310 } 1311 1312 /* 1313 * Updating the frame history depends on whether packets were 1314 * aggregated. 1315 * 1316 * For aggregation, all packets were transmitted at the same rate, the 1317 * first index into rate scale table. 1318 */ 1319 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 1320 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, lq_rate.index, 1321 info->status.ampdu_len, 1322 info->status.ampdu_ack_len, 1323 reduced_txp); 1324 1325 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat 1326 * it as a single frame loss as we don't want the success ratio 1327 * to dip too quickly because a BA wasn't received. 1328 * For TPC, there's no need for this optimisation since we want 1329 * to recover very quickly from a bad power reduction and, 1330 * therefore we'd like the success ratio to get an immediate hit 1331 * when failing to get a BA, so we'd switch back to a lower or 1332 * zero power reduction. When FW transmits agg with a rate 1333 * different from the initial rate, it will not use reduced txp 1334 * and will send BA notification twice (one empty with reduced 1335 * txp equal to the value from LQ and one with reduced txp 0). 1336 * We need to update counters for each txp level accordingly. 1337 */ 1338 if (info->status.ampdu_ack_len == 0) 1339 info->status.ampdu_len = 1; 1340 1341 rs_collect_tlc_data(mvm, lq_sta, curr_tbl, lq_rate.index, 1342 info->status.ampdu_len, 1343 info->status.ampdu_ack_len); 1344 1345 /* Update success/fail counts if not searching for new mode */ 1346 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1347 lq_sta->total_success += info->status.ampdu_ack_len; 1348 lq_sta->total_failed += (info->status.ampdu_len - 1349 info->status.ampdu_ack_len); 1350 } 1351 } else { 1352 /* For legacy, update frame history with for each Tx retry. */ 1353 retries = info->status.rates[0].count - 1; 1354 /* HW doesn't send more than 15 retries */ 1355 retries = min(retries, 15); 1356 1357 /* The last transmission may have been successful */ 1358 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK); 1359 /* Collect data for each rate used during failed TX attempts */ 1360 for (i = 0; i <= retries; ++i) { 1361 lq_hwrate = le32_to_cpu(table->rs_table[i]); 1362 rs_rate_from_ucode_rate(lq_hwrate, info->band, 1363 &lq_rate); 1364 /* 1365 * Only collect stats if retried rate is in the same RS 1366 * table as active/search. 1367 */ 1368 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate)) 1369 tmp_tbl = curr_tbl; 1370 else if (rs_rate_column_match(&lq_rate, 1371 &other_tbl->rate)) 1372 tmp_tbl = other_tbl; 1373 else 1374 continue; 1375 1376 rs_collect_tpc_data(mvm, lq_sta, tmp_tbl, 1377 lq_rate.index, 1, 1378 i < retries ? 0 : legacy_success, 1379 reduced_txp); 1380 rs_collect_tlc_data(mvm, lq_sta, tmp_tbl, 1381 lq_rate.index, 1, 1382 i < retries ? 0 : legacy_success); 1383 } 1384 1385 /* Update success/fail counts if not searching for new mode */ 1386 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1387 lq_sta->total_success += legacy_success; 1388 lq_sta->total_failed += retries + (1 - legacy_success); 1389 } 1390 } 1391 /* The last TX rate is cached in lq_sta; it's set in if/else above */ 1392 lq_sta->last_rate_n_flags = lq_hwrate; 1393 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp); 1394 done: 1395 /* See if there's a better rate or modulation mode to try. */ 1396 if (sta->supp_rates[info->band]) 1397 rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp); 1398 } 1399 1400 /* 1401 * mac80211 sends us Tx status 1402 */ 1403 static void rs_mac80211_tx_status(void *mvm_r, 1404 struct ieee80211_supported_band *sband, 1405 struct ieee80211_sta *sta, void *priv_sta, 1406 struct sk_buff *skb) 1407 { 1408 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1409 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r; 1410 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 1411 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1412 1413 if (!iwl_mvm_sta_from_mac80211(sta)->vif) 1414 return; 1415 1416 if (!ieee80211_is_data(hdr->frame_control) || 1417 info->flags & IEEE80211_TX_CTL_NO_ACK) 1418 return; 1419 1420 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info, 1421 ieee80211_is_qos_nullfunc(hdr->frame_control)); 1422 } 1423 1424 /* 1425 * Begin a period of staying with a selected modulation mode. 1426 * Set "stay_in_tbl" flag to prevent any mode switches. 1427 * Set frame tx success limits according to legacy vs. high-throughput, 1428 * and reset overall (spanning all rates) tx success history statistics. 1429 * These control how long we stay using same modulation mode before 1430 * searching for a new mode. 1431 */ 1432 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy, 1433 struct iwl_lq_sta *lq_sta) 1434 { 1435 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n"); 1436 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN; 1437 if (is_legacy) { 1438 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT; 1439 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT; 1440 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT; 1441 } else { 1442 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT; 1443 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT; 1444 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT; 1445 } 1446 lq_sta->table_count = 0; 1447 lq_sta->total_failed = 0; 1448 lq_sta->total_success = 0; 1449 lq_sta->flush_timer = jiffies; 1450 lq_sta->visited_columns = 0; 1451 } 1452 1453 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask) 1454 { 1455 if (rate_mask) 1456 return find_last_bit(&rate_mask, BITS_PER_LONG); 1457 return IWL_RATE_INVALID; 1458 } 1459 1460 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta, 1461 const struct rs_tx_column *column) 1462 { 1463 switch (column->mode) { 1464 case RS_LEGACY: 1465 return lq_sta->max_legacy_rate_idx; 1466 case RS_SISO: 1467 return lq_sta->max_siso_rate_idx; 1468 case RS_MIMO2: 1469 return lq_sta->max_mimo2_rate_idx; 1470 default: 1471 WARN_ON_ONCE(1); 1472 } 1473 1474 return lq_sta->max_legacy_rate_idx; 1475 } 1476 1477 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1478 const struct rs_tx_column *column, 1479 u32 bw) 1480 { 1481 /* Used to choose among HT tables */ 1482 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT]; 1483 1484 if (WARN_ON_ONCE(column->mode != RS_LEGACY && 1485 column->mode != RS_SISO && 1486 column->mode != RS_MIMO2)) 1487 return expected_tpt_legacy; 1488 1489 /* Legacy rates have only one table */ 1490 if (column->mode == RS_LEGACY) 1491 return expected_tpt_legacy; 1492 1493 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1494 /* Choose among many HT tables depending on number of streams 1495 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation 1496 * status */ 1497 if (column->mode == RS_SISO) { 1498 switch (bw) { 1499 case RATE_MCS_CHAN_WIDTH_20: 1500 ht_tbl_pointer = expected_tpt_siso_20MHz; 1501 break; 1502 case RATE_MCS_CHAN_WIDTH_40: 1503 ht_tbl_pointer = expected_tpt_siso_40MHz; 1504 break; 1505 case RATE_MCS_CHAN_WIDTH_80: 1506 ht_tbl_pointer = expected_tpt_siso_80MHz; 1507 break; 1508 case RATE_MCS_CHAN_WIDTH_160: 1509 ht_tbl_pointer = expected_tpt_siso_160MHz; 1510 break; 1511 default: 1512 WARN_ON_ONCE(1); 1513 } 1514 } else if (column->mode == RS_MIMO2) { 1515 switch (bw) { 1516 case RATE_MCS_CHAN_WIDTH_20: 1517 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1518 break; 1519 case RATE_MCS_CHAN_WIDTH_40: 1520 ht_tbl_pointer = expected_tpt_mimo2_40MHz; 1521 break; 1522 case RATE_MCS_CHAN_WIDTH_80: 1523 ht_tbl_pointer = expected_tpt_mimo2_80MHz; 1524 break; 1525 case RATE_MCS_CHAN_WIDTH_160: 1526 ht_tbl_pointer = expected_tpt_mimo2_160MHz; 1527 break; 1528 default: 1529 WARN_ON_ONCE(1); 1530 } 1531 } else { 1532 WARN_ON_ONCE(1); 1533 } 1534 1535 if (!column->sgi && !lq_sta->is_agg) /* Normal */ 1536 return ht_tbl_pointer[0]; 1537 else if (column->sgi && !lq_sta->is_agg) /* SGI */ 1538 return ht_tbl_pointer[1]; 1539 else if (!column->sgi && lq_sta->is_agg) /* AGG */ 1540 return ht_tbl_pointer[2]; 1541 else /* AGG+SGI */ 1542 return ht_tbl_pointer[3]; 1543 } 1544 1545 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1546 struct iwl_scale_tbl_info *tbl) 1547 { 1548 struct rs_rate *rate = &tbl->rate; 1549 const struct rs_tx_column *column = &rs_tx_columns[tbl->column]; 1550 1551 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw); 1552 } 1553 1554 static s32 rs_get_best_rate(struct iwl_mvm *mvm, 1555 struct iwl_lq_sta *lq_sta, 1556 struct iwl_scale_tbl_info *tbl, /* "search" */ 1557 unsigned long rate_mask, s8 index) 1558 { 1559 struct iwl_scale_tbl_info *active_tbl = 1560 &(lq_sta->lq_info[lq_sta->active_tbl]); 1561 s32 success_ratio = active_tbl->win[index].success_ratio; 1562 u16 expected_current_tpt = active_tbl->expected_tpt[index]; 1563 const u16 *tpt_tbl = tbl->expected_tpt; 1564 u16 high_low; 1565 u32 target_tpt; 1566 int rate_idx; 1567 1568 if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { 1569 target_tpt = 100 * expected_current_tpt; 1570 IWL_DEBUG_RATE(mvm, 1571 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n", 1572 success_ratio, target_tpt); 1573 } else { 1574 target_tpt = lq_sta->last_tpt; 1575 IWL_DEBUG_RATE(mvm, 1576 "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n", 1577 success_ratio, target_tpt); 1578 } 1579 1580 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG); 1581 1582 while (rate_idx != IWL_RATE_INVALID) { 1583 if (target_tpt < (100 * tpt_tbl[rate_idx])) 1584 break; 1585 1586 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask, 1587 tbl->rate.type); 1588 1589 rate_idx = (high_low >> 8) & 0xff; 1590 } 1591 1592 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n", 1593 rate_idx, target_tpt, 1594 rate_idx != IWL_RATE_INVALID ? 1595 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE); 1596 1597 return rate_idx; 1598 } 1599 1600 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta) 1601 { 1602 switch (sta->bandwidth) { 1603 case IEEE80211_STA_RX_BW_160: 1604 return RATE_MCS_CHAN_WIDTH_160; 1605 case IEEE80211_STA_RX_BW_80: 1606 return RATE_MCS_CHAN_WIDTH_80; 1607 case IEEE80211_STA_RX_BW_40: 1608 return RATE_MCS_CHAN_WIDTH_40; 1609 case IEEE80211_STA_RX_BW_20: 1610 default: 1611 return RATE_MCS_CHAN_WIDTH_20; 1612 } 1613 } 1614 1615 /* 1616 * Check whether we should continue using same modulation mode, or 1617 * begin search for a new mode, based on: 1618 * 1) # tx successes or failures while using this mode 1619 * 2) # times calling this function 1620 * 3) elapsed time in this mode (not used, for now) 1621 */ 1622 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search) 1623 { 1624 struct iwl_scale_tbl_info *tbl; 1625 int active_tbl; 1626 int flush_interval_passed = 0; 1627 struct iwl_mvm *mvm; 1628 1629 mvm = lq_sta->pers.drv; 1630 active_tbl = lq_sta->active_tbl; 1631 1632 tbl = &(lq_sta->lq_info[active_tbl]); 1633 1634 /* If we've been disallowing search, see if we should now allow it */ 1635 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1636 /* Elapsed time using current modulation mode */ 1637 if (lq_sta->flush_timer) 1638 flush_interval_passed = 1639 time_after(jiffies, 1640 (unsigned long)(lq_sta->flush_timer + 1641 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ))); 1642 1643 /* 1644 * Check if we should allow search for new modulation mode. 1645 * If many frames have failed or succeeded, or we've used 1646 * this same modulation for a long time, allow search, and 1647 * reset history stats that keep track of whether we should 1648 * allow a new search. Also (below) reset all bitmaps and 1649 * stats in active history. 1650 */ 1651 if (force_search || 1652 (lq_sta->total_failed > lq_sta->max_failure_limit) || 1653 (lq_sta->total_success > lq_sta->max_success_limit) || 1654 ((!lq_sta->search_better_tbl) && 1655 (lq_sta->flush_timer) && (flush_interval_passed))) { 1656 IWL_DEBUG_RATE(mvm, 1657 "LQ: stay is expired %d %d %d\n", 1658 lq_sta->total_failed, 1659 lq_sta->total_success, 1660 flush_interval_passed); 1661 1662 /* Allow search for new mode */ 1663 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED; 1664 IWL_DEBUG_RATE(mvm, 1665 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n"); 1666 lq_sta->total_failed = 0; 1667 lq_sta->total_success = 0; 1668 lq_sta->flush_timer = 0; 1669 /* mark the current column as visited */ 1670 lq_sta->visited_columns = BIT(tbl->column); 1671 /* 1672 * Else if we've used this modulation mode enough repetitions 1673 * (regardless of elapsed time or success/failure), reset 1674 * history bitmaps and rate-specific stats for all rates in 1675 * active table. 1676 */ 1677 } else { 1678 lq_sta->table_count++; 1679 if (lq_sta->table_count >= 1680 lq_sta->table_count_limit) { 1681 lq_sta->table_count = 0; 1682 1683 IWL_DEBUG_RATE(mvm, 1684 "LQ: stay in table clear win\n"); 1685 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1686 } 1687 } 1688 1689 /* If transitioning to allow "search", reset all history 1690 * bitmaps and stats in active table (this will become the new 1691 * "search" table). */ 1692 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) { 1693 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1694 } 1695 } 1696 } 1697 1698 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1699 struct iwl_scale_tbl_info *tbl, 1700 enum rs_action scale_action) 1701 { 1702 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta); 1703 1704 if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) || 1705 tbl->rate.index < IWL_RATE_MCS_5_INDEX || 1706 scale_action == RS_ACTION_DOWNSCALE) 1707 sta_priv->tlc_amsdu = false; 1708 else 1709 sta_priv->tlc_amsdu = true; 1710 } 1711 1712 /* 1713 * setup rate table in uCode 1714 */ 1715 static void rs_update_rate_tbl(struct iwl_mvm *mvm, 1716 struct ieee80211_sta *sta, 1717 struct iwl_lq_sta *lq_sta, 1718 struct iwl_scale_tbl_info *tbl) 1719 { 1720 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate); 1721 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false); 1722 } 1723 1724 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm, 1725 struct ieee80211_sta *sta, 1726 struct iwl_lq_sta *lq_sta, 1727 struct iwl_scale_tbl_info *tbl, 1728 enum rs_action scale_action) 1729 { 1730 if (sta->bandwidth != IEEE80211_STA_RX_BW_80) 1731 return false; 1732 1733 if (!is_vht_siso(&tbl->rate)) 1734 return false; 1735 1736 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) && 1737 (tbl->rate.index == IWL_RATE_MCS_0_INDEX) && 1738 (scale_action == RS_ACTION_DOWNSCALE)) { 1739 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20; 1740 tbl->rate.index = IWL_RATE_MCS_4_INDEX; 1741 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n"); 1742 goto tweaked; 1743 } 1744 1745 /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is 1746 * sustainable, i.e. we're past the test window. We can't go back 1747 * if MCS5 is just tested as this will happen always after switching 1748 * to 20Mhz MCS4 because the rate stats are cleared. 1749 */ 1750 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) && 1751 (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) && 1752 (scale_action == RS_ACTION_STAY)) || 1753 ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) && 1754 (scale_action == RS_ACTION_UPSCALE)))) { 1755 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80; 1756 tbl->rate.index = IWL_RATE_MCS_1_INDEX; 1757 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n"); 1758 goto tweaked; 1759 } 1760 1761 return false; 1762 1763 tweaked: 1764 rs_set_expected_tpt_table(lq_sta, tbl); 1765 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1766 return true; 1767 } 1768 1769 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm, 1770 struct iwl_lq_sta *lq_sta, 1771 struct ieee80211_sta *sta, 1772 struct iwl_scale_tbl_info *tbl) 1773 { 1774 int i, j, max_rate; 1775 enum rs_column next_col_id; 1776 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column]; 1777 const struct rs_tx_column *next_col; 1778 allow_column_func_t allow_func; 1779 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm); 1780 const u16 *expected_tpt_tbl; 1781 u16 tpt, max_expected_tpt; 1782 1783 for (i = 0; i < MAX_NEXT_COLUMNS; i++) { 1784 next_col_id = curr_col->next_columns[i]; 1785 1786 if (next_col_id == RS_COLUMN_INVALID) 1787 continue; 1788 1789 if (lq_sta->visited_columns & BIT(next_col_id)) { 1790 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n", 1791 next_col_id); 1792 continue; 1793 } 1794 1795 next_col = &rs_tx_columns[next_col_id]; 1796 1797 if (!rs_is_valid_ant(valid_ants, next_col->ant)) { 1798 IWL_DEBUG_RATE(mvm, 1799 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n", 1800 next_col_id, valid_ants, next_col->ant); 1801 continue; 1802 } 1803 1804 for (j = 0; j < MAX_COLUMN_CHECKS; j++) { 1805 allow_func = next_col->checks[j]; 1806 if (allow_func && !allow_func(mvm, sta, &tbl->rate, 1807 next_col)) 1808 break; 1809 } 1810 1811 if (j != MAX_COLUMN_CHECKS) { 1812 IWL_DEBUG_RATE(mvm, 1813 "Skip column %d: not allowed (check %d failed)\n", 1814 next_col_id, j); 1815 1816 continue; 1817 } 1818 1819 tpt = lq_sta->last_tpt / 100; 1820 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col, 1821 rs_bw_from_sta_bw(sta)); 1822 if (WARN_ON_ONCE(!expected_tpt_tbl)) 1823 continue; 1824 1825 max_rate = rs_get_max_allowed_rate(lq_sta, next_col); 1826 if (max_rate == IWL_RATE_INVALID) { 1827 IWL_DEBUG_RATE(mvm, 1828 "Skip column %d: no rate is allowed in this column\n", 1829 next_col_id); 1830 continue; 1831 } 1832 1833 max_expected_tpt = expected_tpt_tbl[max_rate]; 1834 if (tpt >= max_expected_tpt) { 1835 IWL_DEBUG_RATE(mvm, 1836 "Skip column %d: can't beat current TPT. Max expected %d current %d\n", 1837 next_col_id, max_expected_tpt, tpt); 1838 continue; 1839 } 1840 1841 IWL_DEBUG_RATE(mvm, 1842 "Found potential column %d. Max expected %d current %d\n", 1843 next_col_id, max_expected_tpt, tpt); 1844 break; 1845 } 1846 1847 if (i == MAX_NEXT_COLUMNS) 1848 return RS_COLUMN_INVALID; 1849 1850 return next_col_id; 1851 } 1852 1853 static int rs_switch_to_column(struct iwl_mvm *mvm, 1854 struct iwl_lq_sta *lq_sta, 1855 struct ieee80211_sta *sta, 1856 enum rs_column col_id) 1857 { 1858 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1859 struct iwl_scale_tbl_info *search_tbl = 1860 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 1861 struct rs_rate *rate = &search_tbl->rate; 1862 const struct rs_tx_column *column = &rs_tx_columns[col_id]; 1863 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column]; 1864 u32 sz = (sizeof(struct iwl_scale_tbl_info) - 1865 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); 1866 unsigned long rate_mask = 0; 1867 u32 rate_idx = 0; 1868 1869 memcpy(search_tbl, tbl, sz); 1870 1871 rate->sgi = column->sgi; 1872 rate->ant = column->ant; 1873 1874 if (column->mode == RS_LEGACY) { 1875 if (lq_sta->band == NL80211_BAND_5GHZ) 1876 rate->type = LQ_LEGACY_A; 1877 else 1878 rate->type = LQ_LEGACY_G; 1879 1880 rate->bw = RATE_MCS_CHAN_WIDTH_20; 1881 rate->ldpc = false; 1882 rate_mask = lq_sta->active_legacy_rate; 1883 } else if (column->mode == RS_SISO) { 1884 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; 1885 rate_mask = lq_sta->active_siso_rate; 1886 } else if (column->mode == RS_MIMO2) { 1887 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; 1888 rate_mask = lq_sta->active_mimo2_rate; 1889 } else { 1890 WARN_ONCE(1, "Bad column mode"); 1891 } 1892 1893 if (column->mode != RS_LEGACY) { 1894 rate->bw = rs_bw_from_sta_bw(sta); 1895 rate->ldpc = lq_sta->ldpc; 1896 } 1897 1898 search_tbl->column = col_id; 1899 rs_set_expected_tpt_table(lq_sta, search_tbl); 1900 1901 lq_sta->visited_columns |= BIT(col_id); 1902 1903 /* Get the best matching rate if we're changing modes. e.g. 1904 * SISO->MIMO, LEGACY->SISO, MIMO->SISO 1905 */ 1906 if (curr_column->mode != column->mode) { 1907 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl, 1908 rate_mask, rate->index); 1909 1910 if ((rate_idx == IWL_RATE_INVALID) || 1911 !(BIT(rate_idx) & rate_mask)) { 1912 IWL_DEBUG_RATE(mvm, 1913 "can not switch with index %d" 1914 " rate mask %lx\n", 1915 rate_idx, rate_mask); 1916 1917 goto err; 1918 } 1919 1920 rate->index = rate_idx; 1921 } 1922 1923 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n", 1924 col_id, rate->index); 1925 1926 return 0; 1927 1928 err: 1929 rate->type = LQ_NONE; 1930 return -1; 1931 } 1932 1933 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm, 1934 struct iwl_scale_tbl_info *tbl, 1935 s32 sr, int low, int high, 1936 int current_tpt, 1937 int low_tpt, int high_tpt) 1938 { 1939 enum rs_action action = RS_ACTION_STAY; 1940 1941 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) || 1942 (current_tpt == 0)) { 1943 IWL_DEBUG_RATE(mvm, 1944 "Decrease rate because of low SR\n"); 1945 return RS_ACTION_DOWNSCALE; 1946 } 1947 1948 if ((low_tpt == IWL_INVALID_VALUE) && 1949 (high_tpt == IWL_INVALID_VALUE) && 1950 (high != IWL_RATE_INVALID)) { 1951 IWL_DEBUG_RATE(mvm, 1952 "No data about high/low rates. Increase rate\n"); 1953 return RS_ACTION_UPSCALE; 1954 } 1955 1956 if ((high_tpt == IWL_INVALID_VALUE) && 1957 (high != IWL_RATE_INVALID) && 1958 (low_tpt != IWL_INVALID_VALUE) && 1959 (low_tpt < current_tpt)) { 1960 IWL_DEBUG_RATE(mvm, 1961 "No data about high rate and low rate is worse. Increase rate\n"); 1962 return RS_ACTION_UPSCALE; 1963 } 1964 1965 if ((high_tpt != IWL_INVALID_VALUE) && 1966 (high_tpt > current_tpt)) { 1967 IWL_DEBUG_RATE(mvm, 1968 "Higher rate is better. Increate rate\n"); 1969 return RS_ACTION_UPSCALE; 1970 } 1971 1972 if ((low_tpt != IWL_INVALID_VALUE) && 1973 (high_tpt != IWL_INVALID_VALUE) && 1974 (low_tpt < current_tpt) && 1975 (high_tpt < current_tpt)) { 1976 IWL_DEBUG_RATE(mvm, 1977 "Both high and low are worse. Maintain rate\n"); 1978 return RS_ACTION_STAY; 1979 } 1980 1981 if ((low_tpt != IWL_INVALID_VALUE) && 1982 (low_tpt > current_tpt)) { 1983 IWL_DEBUG_RATE(mvm, 1984 "Lower rate is better\n"); 1985 action = RS_ACTION_DOWNSCALE; 1986 goto out; 1987 } 1988 1989 if ((low_tpt == IWL_INVALID_VALUE) && 1990 (low != IWL_RATE_INVALID)) { 1991 IWL_DEBUG_RATE(mvm, 1992 "No data about lower rate\n"); 1993 action = RS_ACTION_DOWNSCALE; 1994 goto out; 1995 } 1996 1997 IWL_DEBUG_RATE(mvm, "Maintain rate\n"); 1998 1999 out: 2000 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) { 2001 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { 2002 IWL_DEBUG_RATE(mvm, 2003 "SR is above NO DECREASE. Avoid downscale\n"); 2004 action = RS_ACTION_STAY; 2005 } else if (current_tpt > (100 * tbl->expected_tpt[low])) { 2006 IWL_DEBUG_RATE(mvm, 2007 "Current TPT is higher than max expected in low rate. Avoid downscale\n"); 2008 action = RS_ACTION_STAY; 2009 } else { 2010 IWL_DEBUG_RATE(mvm, "Decrease rate\n"); 2011 } 2012 } 2013 2014 return action; 2015 } 2016 2017 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 2018 struct iwl_lq_sta *lq_sta) 2019 { 2020 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which 2021 * supports STBC of at least 1*SS 2022 */ 2023 if (!lq_sta->stbc_capable) 2024 return false; 2025 2026 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 2027 return false; 2028 2029 return true; 2030 } 2031 2032 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index, 2033 int *weaker, int *stronger) 2034 { 2035 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP; 2036 if (*weaker > TPC_MAX_REDUCTION) 2037 *weaker = TPC_INVALID; 2038 2039 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP; 2040 if (*stronger < 0) 2041 *stronger = TPC_INVALID; 2042 } 2043 2044 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif, 2045 struct rs_rate *rate, enum nl80211_band band) 2046 { 2047 int index = rate->index; 2048 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM); 2049 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION && 2050 !vif->bss_conf.ps); 2051 2052 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n", 2053 cam, sta_ps_disabled); 2054 /* 2055 * allow tpc only if power management is enabled, or bt coex 2056 * activity grade allows it and we are on 2.4Ghz. 2057 */ 2058 if ((cam || sta_ps_disabled) && 2059 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band)) 2060 return false; 2061 2062 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type); 2063 if (is_legacy(rate)) 2064 return index == IWL_RATE_54M_INDEX; 2065 if (is_ht(rate)) 2066 return index == IWL_RATE_MCS_7_INDEX; 2067 if (is_vht(rate)) 2068 return index == IWL_RATE_MCS_7_INDEX || 2069 index == IWL_RATE_MCS_8_INDEX || 2070 index == IWL_RATE_MCS_9_INDEX; 2071 2072 WARN_ON_ONCE(1); 2073 return false; 2074 } 2075 2076 enum tpc_action { 2077 TPC_ACTION_STAY, 2078 TPC_ACTION_DECREASE, 2079 TPC_ACTION_INCREASE, 2080 TPC_ACTION_NO_RESTIRCTION, 2081 }; 2082 2083 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm, 2084 s32 sr, int weak, int strong, 2085 int current_tpt, 2086 int weak_tpt, int strong_tpt) 2087 { 2088 /* stay until we have valid tpt */ 2089 if (current_tpt == IWL_INVALID_VALUE) { 2090 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n"); 2091 return TPC_ACTION_STAY; 2092 } 2093 2094 /* Too many failures, increase txp */ 2095 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) || 2096 current_tpt == 0) { 2097 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n"); 2098 return TPC_ACTION_NO_RESTIRCTION; 2099 } 2100 2101 /* try decreasing first if applicable */ 2102 if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) && 2103 weak != TPC_INVALID) { 2104 if (weak_tpt == IWL_INVALID_VALUE && 2105 (strong_tpt == IWL_INVALID_VALUE || 2106 current_tpt >= strong_tpt)) { 2107 IWL_DEBUG_RATE(mvm, 2108 "no weak txp measurement. decrease txp\n"); 2109 return TPC_ACTION_DECREASE; 2110 } 2111 2112 if (weak_tpt > current_tpt) { 2113 IWL_DEBUG_RATE(mvm, 2114 "lower txp has better tpt. decrease txp\n"); 2115 return TPC_ACTION_DECREASE; 2116 } 2117 } 2118 2119 /* next, increase if needed */ 2120 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) && 2121 strong != TPC_INVALID) { 2122 if (weak_tpt == IWL_INVALID_VALUE && 2123 strong_tpt != IWL_INVALID_VALUE && 2124 current_tpt < strong_tpt) { 2125 IWL_DEBUG_RATE(mvm, 2126 "higher txp has better tpt. increase txp\n"); 2127 return TPC_ACTION_INCREASE; 2128 } 2129 2130 if (weak_tpt < current_tpt && 2131 (strong_tpt == IWL_INVALID_VALUE || 2132 strong_tpt > current_tpt)) { 2133 IWL_DEBUG_RATE(mvm, 2134 "lower txp has worse tpt. increase txp\n"); 2135 return TPC_ACTION_INCREASE; 2136 } 2137 } 2138 2139 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n"); 2140 return TPC_ACTION_STAY; 2141 } 2142 2143 static bool rs_tpc_perform(struct iwl_mvm *mvm, 2144 struct ieee80211_sta *sta, 2145 struct iwl_lq_sta *lq_sta, 2146 struct iwl_scale_tbl_info *tbl) 2147 { 2148 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta); 2149 struct ieee80211_vif *vif = mvm_sta->vif; 2150 struct ieee80211_chanctx_conf *chanctx_conf; 2151 enum nl80211_band band; 2152 struct iwl_rate_scale_data *window; 2153 struct rs_rate *rate = &tbl->rate; 2154 enum tpc_action action; 2155 s32 sr; 2156 u8 cur = lq_sta->lq.reduced_tpc; 2157 int current_tpt; 2158 int weak, strong; 2159 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE; 2160 2161 #ifdef CONFIG_MAC80211_DEBUGFS 2162 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) { 2163 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n", 2164 lq_sta->pers.dbg_fixed_txp_reduction); 2165 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction; 2166 return cur != lq_sta->pers.dbg_fixed_txp_reduction; 2167 } 2168 #endif 2169 2170 rcu_read_lock(); 2171 chanctx_conf = rcu_dereference(vif->chanctx_conf); 2172 if (WARN_ON(!chanctx_conf)) 2173 band = NUM_NL80211_BANDS; 2174 else 2175 band = chanctx_conf->def.chan->band; 2176 rcu_read_unlock(); 2177 2178 if (!rs_tpc_allowed(mvm, vif, rate, band)) { 2179 IWL_DEBUG_RATE(mvm, 2180 "tpc is not allowed. remove txp restrictions\n"); 2181 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 2182 return cur != TPC_NO_REDUCTION; 2183 } 2184 2185 rs_get_adjacent_txp(mvm, cur, &weak, &strong); 2186 2187 /* Collect measured throughputs for current and adjacent rates */ 2188 window = tbl->tpc_win; 2189 sr = window[cur].success_ratio; 2190 current_tpt = window[cur].average_tpt; 2191 if (weak != TPC_INVALID) 2192 weak_tpt = window[weak].average_tpt; 2193 if (strong != TPC_INVALID) 2194 strong_tpt = window[strong].average_tpt; 2195 2196 IWL_DEBUG_RATE(mvm, 2197 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n", 2198 cur, current_tpt, sr, weak, strong, 2199 weak_tpt, strong_tpt); 2200 2201 action = rs_get_tpc_action(mvm, sr, weak, strong, 2202 current_tpt, weak_tpt, strong_tpt); 2203 2204 /* override actions if we are on the edge */ 2205 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) { 2206 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n"); 2207 action = TPC_ACTION_STAY; 2208 } else if (strong == TPC_INVALID && 2209 (action == TPC_ACTION_INCREASE || 2210 action == TPC_ACTION_NO_RESTIRCTION)) { 2211 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n"); 2212 action = TPC_ACTION_STAY; 2213 } 2214 2215 switch (action) { 2216 case TPC_ACTION_DECREASE: 2217 lq_sta->lq.reduced_tpc = weak; 2218 return true; 2219 case TPC_ACTION_INCREASE: 2220 lq_sta->lq.reduced_tpc = strong; 2221 return true; 2222 case TPC_ACTION_NO_RESTIRCTION: 2223 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 2224 return true; 2225 case TPC_ACTION_STAY: 2226 /* do nothing */ 2227 break; 2228 } 2229 return false; 2230 } 2231 2232 /* 2233 * Do rate scaling and search for new modulation mode. 2234 */ 2235 static void rs_rate_scale_perform(struct iwl_mvm *mvm, 2236 struct ieee80211_sta *sta, 2237 struct iwl_lq_sta *lq_sta, 2238 int tid, bool ndp) 2239 { 2240 int low = IWL_RATE_INVALID; 2241 int high = IWL_RATE_INVALID; 2242 int index; 2243 struct iwl_rate_scale_data *window = NULL; 2244 int current_tpt = IWL_INVALID_VALUE; 2245 int low_tpt = IWL_INVALID_VALUE; 2246 int high_tpt = IWL_INVALID_VALUE; 2247 u32 fail_count; 2248 enum rs_action scale_action = RS_ACTION_STAY; 2249 u16 rate_mask; 2250 u8 update_lq = 0; 2251 struct iwl_scale_tbl_info *tbl, *tbl1; 2252 u8 active_tbl = 0; 2253 u8 done_search = 0; 2254 u16 high_low; 2255 s32 sr; 2256 u8 prev_agg = lq_sta->is_agg; 2257 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta); 2258 struct iwl_mvm_tid_data *tid_data; 2259 struct rs_rate *rate; 2260 2261 lq_sta->is_agg = !!sta_priv->agg_tids; 2262 2263 /* 2264 * Select rate-scale / modulation-mode table to work with in 2265 * the rest of this function: "search" if searching for better 2266 * modulation mode, or "active" if doing rate scaling within a mode. 2267 */ 2268 if (!lq_sta->search_better_tbl) 2269 active_tbl = lq_sta->active_tbl; 2270 else 2271 active_tbl = 1 - lq_sta->active_tbl; 2272 2273 tbl = &(lq_sta->lq_info[active_tbl]); 2274 rate = &tbl->rate; 2275 2276 if (prev_agg != lq_sta->is_agg) { 2277 IWL_DEBUG_RATE(mvm, 2278 "Aggregation changed: prev %d current %d. Update expected TPT table\n", 2279 prev_agg, lq_sta->is_agg); 2280 rs_set_expected_tpt_table(lq_sta, tbl); 2281 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2282 } 2283 2284 /* current tx rate */ 2285 index = rate->index; 2286 2287 /* rates available for this association, and for modulation mode */ 2288 rate_mask = rs_get_supported_rates(lq_sta, rate); 2289 2290 if (!(BIT(index) & rate_mask)) { 2291 IWL_ERR(mvm, "Current Rate is not valid\n"); 2292 if (lq_sta->search_better_tbl) { 2293 /* revert to active table if search table is not valid*/ 2294 rate->type = LQ_NONE; 2295 lq_sta->search_better_tbl = 0; 2296 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 2297 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2298 } 2299 return; 2300 } 2301 2302 /* Get expected throughput table and history window for current rate */ 2303 if (!tbl->expected_tpt) { 2304 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n"); 2305 return; 2306 } 2307 2308 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2309 window = &(tbl->win[index]); 2310 2311 /* 2312 * If there is not enough history to calculate actual average 2313 * throughput, keep analyzing results of more tx frames, without 2314 * changing rate or mode (bypass most of the rest of this function). 2315 * Set up new rate table in uCode only if old rate is not supported 2316 * in current association (use new rate found above). 2317 */ 2318 fail_count = window->counter - window->success_counter; 2319 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) && 2320 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) { 2321 IWL_DEBUG_RATE(mvm, 2322 "%s: Test Window: succ %d total %d\n", 2323 rs_pretty_rate(rate), 2324 window->success_counter, window->counter); 2325 2326 /* Can't calculate this yet; not enough history */ 2327 window->average_tpt = IWL_INVALID_VALUE; 2328 2329 /* Should we stay with this modulation mode, 2330 * or search for a new one? */ 2331 rs_stay_in_table(lq_sta, false); 2332 2333 return; 2334 } 2335 2336 /* If we are searching for better modulation mode, check success. */ 2337 if (lq_sta->search_better_tbl) { 2338 /* If good success, continue using the "search" mode; 2339 * no need to send new link quality command, since we're 2340 * continuing to use the setup that we've been trying. */ 2341 if (window->average_tpt > lq_sta->last_tpt) { 2342 IWL_DEBUG_RATE(mvm, 2343 "SWITCHING TO NEW TABLE SR: %d " 2344 "cur-tpt %d old-tpt %d\n", 2345 window->success_ratio, 2346 window->average_tpt, 2347 lq_sta->last_tpt); 2348 2349 /* Swap tables; "search" becomes "active" */ 2350 lq_sta->active_tbl = active_tbl; 2351 current_tpt = window->average_tpt; 2352 /* Else poor success; go back to mode in "active" table */ 2353 } else { 2354 IWL_DEBUG_RATE(mvm, 2355 "GOING BACK TO THE OLD TABLE: SR %d " 2356 "cur-tpt %d old-tpt %d\n", 2357 window->success_ratio, 2358 window->average_tpt, 2359 lq_sta->last_tpt); 2360 2361 /* Nullify "search" table */ 2362 rate->type = LQ_NONE; 2363 2364 /* Revert to "active" table */ 2365 active_tbl = lq_sta->active_tbl; 2366 tbl = &(lq_sta->lq_info[active_tbl]); 2367 2368 /* Revert to "active" rate and throughput info */ 2369 index = tbl->rate.index; 2370 current_tpt = lq_sta->last_tpt; 2371 2372 /* Need to set up a new rate table in uCode */ 2373 update_lq = 1; 2374 } 2375 2376 /* Either way, we've made a decision; modulation mode 2377 * search is done, allow rate adjustment next time. */ 2378 lq_sta->search_better_tbl = 0; 2379 done_search = 1; /* Don't switch modes below! */ 2380 goto lq_update; 2381 } 2382 2383 /* (Else) not in search of better modulation mode, try for better 2384 * starting rate, while staying in this mode. */ 2385 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type); 2386 low = high_low & 0xff; 2387 high = (high_low >> 8) & 0xff; 2388 2389 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2390 2391 sr = window->success_ratio; 2392 2393 /* Collect measured throughputs for current and adjacent rates */ 2394 current_tpt = window->average_tpt; 2395 if (low != IWL_RATE_INVALID) 2396 low_tpt = tbl->win[low].average_tpt; 2397 if (high != IWL_RATE_INVALID) 2398 high_tpt = tbl->win[high].average_tpt; 2399 2400 IWL_DEBUG_RATE(mvm, 2401 "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n", 2402 rs_pretty_rate(rate), current_tpt, sr, 2403 low, high, low_tpt, high_tpt); 2404 2405 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high, 2406 current_tpt, low_tpt, high_tpt); 2407 2408 /* Force a search in case BT doesn't like us being in MIMO */ 2409 if (is_mimo(rate) && 2410 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) { 2411 IWL_DEBUG_RATE(mvm, 2412 "BT Coex forbids MIMO. Search for new config\n"); 2413 rs_stay_in_table(lq_sta, true); 2414 goto lq_update; 2415 } 2416 2417 switch (scale_action) { 2418 case RS_ACTION_DOWNSCALE: 2419 /* Decrease starting rate, update uCode's rate table */ 2420 if (low != IWL_RATE_INVALID) { 2421 update_lq = 1; 2422 index = low; 2423 } else { 2424 IWL_DEBUG_RATE(mvm, 2425 "At the bottom rate. Can't decrease\n"); 2426 } 2427 2428 break; 2429 case RS_ACTION_UPSCALE: 2430 /* Increase starting rate, update uCode's rate table */ 2431 if (high != IWL_RATE_INVALID) { 2432 update_lq = 1; 2433 index = high; 2434 } else { 2435 IWL_DEBUG_RATE(mvm, 2436 "At the top rate. Can't increase\n"); 2437 } 2438 2439 break; 2440 case RS_ACTION_STAY: 2441 /* No change */ 2442 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) 2443 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl); 2444 break; 2445 default: 2446 break; 2447 } 2448 2449 lq_update: 2450 /* Replace uCode's rate table for the destination station. */ 2451 if (update_lq) { 2452 tbl->rate.index = index; 2453 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK) 2454 rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action); 2455 rs_set_amsdu_len(mvm, sta, tbl, scale_action); 2456 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2457 } 2458 2459 rs_stay_in_table(lq_sta, false); 2460 2461 /* 2462 * Search for new modulation mode if we're: 2463 * 1) Not changing rates right now 2464 * 2) Not just finishing up a search 2465 * 3) Allowing a new search 2466 */ 2467 if (!update_lq && !done_search && 2468 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED 2469 && window->counter) { 2470 enum rs_column next_column; 2471 2472 /* Save current throughput to compare with "search" throughput*/ 2473 lq_sta->last_tpt = current_tpt; 2474 2475 IWL_DEBUG_RATE(mvm, 2476 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n", 2477 update_lq, done_search, lq_sta->rs_state, 2478 window->counter); 2479 2480 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl); 2481 if (next_column != RS_COLUMN_INVALID) { 2482 int ret = rs_switch_to_column(mvm, lq_sta, sta, 2483 next_column); 2484 if (!ret) 2485 lq_sta->search_better_tbl = 1; 2486 } else { 2487 IWL_DEBUG_RATE(mvm, 2488 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n"); 2489 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED; 2490 } 2491 2492 /* If new "search" mode was selected, set up in uCode table */ 2493 if (lq_sta->search_better_tbl) { 2494 /* Access the "search" table, clear its history. */ 2495 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 2496 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2497 2498 /* Use new "search" start rate */ 2499 index = tbl->rate.index; 2500 2501 rs_dump_rate(mvm, &tbl->rate, 2502 "Switch to SEARCH TABLE:"); 2503 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2504 } else { 2505 done_search = 1; 2506 } 2507 } 2508 2509 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) { 2510 /* If the "active" (non-search) mode was legacy, 2511 * and we've tried switching antennas, 2512 * but we haven't been able to try HT modes (not available), 2513 * stay with best antenna legacy modulation for a while 2514 * before next round of mode comparisons. */ 2515 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]); 2516 if (is_legacy(&tbl1->rate)) { 2517 IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n"); 2518 2519 if (tid != IWL_MAX_TID_COUNT) { 2520 tid_data = &sta_priv->tid_data[tid]; 2521 if (tid_data->state != IWL_AGG_OFF) { 2522 IWL_DEBUG_RATE(mvm, 2523 "Stop aggregation on tid %d\n", 2524 tid); 2525 ieee80211_stop_tx_ba_session(sta, tid); 2526 } 2527 } 2528 rs_set_stay_in_table(mvm, 1, lq_sta); 2529 } else { 2530 /* If we're in an HT mode, and all 3 mode switch actions 2531 * have been tried and compared, stay in this best modulation 2532 * mode for a while before next round of mode comparisons. */ 2533 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) && 2534 (lq_sta->tx_agg_tid_en & (1 << tid)) && 2535 (tid != IWL_MAX_TID_COUNT)) { 2536 tid_data = &sta_priv->tid_data[tid]; 2537 if (tid_data->state == IWL_AGG_OFF && !ndp) { 2538 IWL_DEBUG_RATE(mvm, 2539 "try to aggregate tid %d\n", 2540 tid); 2541 rs_tl_turn_on_agg(mvm, tid, 2542 lq_sta, sta); 2543 } 2544 } 2545 rs_set_stay_in_table(mvm, 0, lq_sta); 2546 } 2547 } 2548 } 2549 2550 struct rs_init_rate_info { 2551 s8 rssi; 2552 u8 rate_idx; 2553 }; 2554 2555 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = { 2556 { -60, IWL_RATE_54M_INDEX }, 2557 { -64, IWL_RATE_48M_INDEX }, 2558 { -68, IWL_RATE_36M_INDEX }, 2559 { -80, IWL_RATE_24M_INDEX }, 2560 { -84, IWL_RATE_18M_INDEX }, 2561 { -85, IWL_RATE_12M_INDEX }, 2562 { -86, IWL_RATE_11M_INDEX }, 2563 { -88, IWL_RATE_5M_INDEX }, 2564 { -90, IWL_RATE_2M_INDEX }, 2565 { S8_MIN, IWL_RATE_1M_INDEX }, 2566 }; 2567 2568 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = { 2569 { -60, IWL_RATE_54M_INDEX }, 2570 { -64, IWL_RATE_48M_INDEX }, 2571 { -72, IWL_RATE_36M_INDEX }, 2572 { -80, IWL_RATE_24M_INDEX }, 2573 { -84, IWL_RATE_18M_INDEX }, 2574 { -85, IWL_RATE_12M_INDEX }, 2575 { -87, IWL_RATE_9M_INDEX }, 2576 { S8_MIN, IWL_RATE_6M_INDEX }, 2577 }; 2578 2579 static const struct rs_init_rate_info rs_optimal_rates_ht[] = { 2580 { -60, IWL_RATE_MCS_7_INDEX }, 2581 { -64, IWL_RATE_MCS_6_INDEX }, 2582 { -68, IWL_RATE_MCS_5_INDEX }, 2583 { -72, IWL_RATE_MCS_4_INDEX }, 2584 { -80, IWL_RATE_MCS_3_INDEX }, 2585 { -84, IWL_RATE_MCS_2_INDEX }, 2586 { -85, IWL_RATE_MCS_1_INDEX }, 2587 { S8_MIN, IWL_RATE_MCS_0_INDEX}, 2588 }; 2589 2590 /* MCS index 9 is not valid for 20MHz VHT channel width, 2591 * but is ok for 40, 80 and 160MHz channels. 2592 */ 2593 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = { 2594 { -60, IWL_RATE_MCS_8_INDEX }, 2595 { -64, IWL_RATE_MCS_7_INDEX }, 2596 { -68, IWL_RATE_MCS_6_INDEX }, 2597 { -72, IWL_RATE_MCS_5_INDEX }, 2598 { -80, IWL_RATE_MCS_4_INDEX }, 2599 { -84, IWL_RATE_MCS_3_INDEX }, 2600 { -85, IWL_RATE_MCS_2_INDEX }, 2601 { -87, IWL_RATE_MCS_1_INDEX }, 2602 { S8_MIN, IWL_RATE_MCS_0_INDEX}, 2603 }; 2604 2605 static const struct rs_init_rate_info rs_optimal_rates_vht[] = { 2606 { -60, IWL_RATE_MCS_9_INDEX }, 2607 { -64, IWL_RATE_MCS_8_INDEX }, 2608 { -68, IWL_RATE_MCS_7_INDEX }, 2609 { -72, IWL_RATE_MCS_6_INDEX }, 2610 { -80, IWL_RATE_MCS_5_INDEX }, 2611 { -84, IWL_RATE_MCS_4_INDEX }, 2612 { -85, IWL_RATE_MCS_3_INDEX }, 2613 { -87, IWL_RATE_MCS_2_INDEX }, 2614 { -88, IWL_RATE_MCS_1_INDEX }, 2615 { S8_MIN, IWL_RATE_MCS_0_INDEX }, 2616 }; 2617 2618 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */ 2619 2620 /* Init the optimal rate based on STA caps 2621 * This combined with rssi is used to report the last tx rate 2622 * to userspace when we haven't transmitted enough frames. 2623 */ 2624 static void rs_init_optimal_rate(struct iwl_mvm *mvm, 2625 struct ieee80211_sta *sta, 2626 struct iwl_lq_sta *lq_sta) 2627 { 2628 struct rs_rate *rate = &lq_sta->optimal_rate; 2629 2630 if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID) 2631 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; 2632 else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID) 2633 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; 2634 else if (lq_sta->band == NL80211_BAND_5GHZ) 2635 rate->type = LQ_LEGACY_A; 2636 else 2637 rate->type = LQ_LEGACY_G; 2638 2639 rate->bw = rs_bw_from_sta_bw(sta); 2640 rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL); 2641 2642 /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */ 2643 2644 if (is_mimo(rate)) { 2645 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate; 2646 } else if (is_siso(rate)) { 2647 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate; 2648 } else { 2649 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate; 2650 2651 if (lq_sta->band == NL80211_BAND_5GHZ) { 2652 lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy; 2653 lq_sta->optimal_nentries = 2654 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy); 2655 } else { 2656 lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy; 2657 lq_sta->optimal_nentries = 2658 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy); 2659 } 2660 } 2661 2662 if (is_vht(rate)) { 2663 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) { 2664 lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz; 2665 lq_sta->optimal_nentries = 2666 ARRAY_SIZE(rs_optimal_rates_vht_20mhz); 2667 } else { 2668 lq_sta->optimal_rates = rs_optimal_rates_vht; 2669 lq_sta->optimal_nentries = 2670 ARRAY_SIZE(rs_optimal_rates_vht); 2671 } 2672 } else if (is_ht(rate)) { 2673 lq_sta->optimal_rates = rs_optimal_rates_ht; 2674 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht); 2675 } 2676 } 2677 2678 /* Compute the optimal rate index based on RSSI */ 2679 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm, 2680 struct iwl_lq_sta *lq_sta) 2681 { 2682 struct rs_rate *rate = &lq_sta->optimal_rate; 2683 int i; 2684 2685 rate->index = find_first_bit(&lq_sta->optimal_rate_mask, 2686 BITS_PER_LONG); 2687 2688 for (i = 0; i < lq_sta->optimal_nentries; i++) { 2689 int rate_idx = lq_sta->optimal_rates[i].rate_idx; 2690 2691 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) && 2692 (BIT(rate_idx) & lq_sta->optimal_rate_mask)) { 2693 rate->index = rate_idx; 2694 break; 2695 } 2696 } 2697 2698 return rate; 2699 } 2700 2701 /* Choose an initial legacy rate and antenna to use based on the RSSI 2702 * of last Rx 2703 */ 2704 static void rs_get_initial_rate(struct iwl_mvm *mvm, 2705 struct ieee80211_sta *sta, 2706 struct iwl_lq_sta *lq_sta, 2707 enum nl80211_band band, 2708 struct rs_rate *rate) 2709 { 2710 int i, nentries; 2711 unsigned long active_rate; 2712 s8 best_rssi = S8_MIN; 2713 u8 best_ant = ANT_NONE; 2714 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 2715 const struct rs_init_rate_info *initial_rates; 2716 2717 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { 2718 if (!(lq_sta->pers.chains & BIT(i))) 2719 continue; 2720 2721 if (lq_sta->pers.chain_signal[i] > best_rssi) { 2722 best_rssi = lq_sta->pers.chain_signal[i]; 2723 best_ant = BIT(i); 2724 } 2725 } 2726 2727 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n", 2728 rs_pretty_ant(best_ant), best_rssi); 2729 2730 if (best_ant != ANT_A && best_ant != ANT_B) 2731 rate->ant = first_antenna(valid_tx_ant); 2732 else 2733 rate->ant = best_ant; 2734 2735 rate->sgi = false; 2736 rate->ldpc = false; 2737 rate->bw = RATE_MCS_CHAN_WIDTH_20; 2738 2739 rate->index = find_first_bit(&lq_sta->active_legacy_rate, 2740 BITS_PER_LONG); 2741 2742 if (band == NL80211_BAND_5GHZ) { 2743 rate->type = LQ_LEGACY_A; 2744 initial_rates = rs_optimal_rates_5ghz_legacy; 2745 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy); 2746 } else { 2747 rate->type = LQ_LEGACY_G; 2748 initial_rates = rs_optimal_rates_24ghz_legacy; 2749 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy); 2750 } 2751 2752 if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE) 2753 goto out; 2754 2755 /* Start from a higher rate if the corresponding debug capability 2756 * is enabled. The rate is chosen according to AP capabilities. 2757 * In case of VHT/HT when the rssi is low fallback to the case of 2758 * legacy rates. 2759 */ 2760 if (sta->vht_cap.vht_supported && 2761 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { 2762 switch (sta->bandwidth) { 2763 case IEEE80211_STA_RX_BW_160: 2764 case IEEE80211_STA_RX_BW_80: 2765 case IEEE80211_STA_RX_BW_40: 2766 initial_rates = rs_optimal_rates_vht; 2767 nentries = ARRAY_SIZE(rs_optimal_rates_vht); 2768 break; 2769 case IEEE80211_STA_RX_BW_20: 2770 initial_rates = rs_optimal_rates_vht_20mhz; 2771 nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz); 2772 break; 2773 default: 2774 IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth); 2775 goto out; 2776 } 2777 2778 active_rate = lq_sta->active_siso_rate; 2779 rate->type = LQ_VHT_SISO; 2780 rate->bw = rs_bw_from_sta_bw(sta); 2781 } else if (sta->ht_cap.ht_supported && 2782 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { 2783 initial_rates = rs_optimal_rates_ht; 2784 nentries = ARRAY_SIZE(rs_optimal_rates_ht); 2785 active_rate = lq_sta->active_siso_rate; 2786 rate->type = LQ_HT_SISO; 2787 } else { 2788 active_rate = lq_sta->active_legacy_rate; 2789 } 2790 2791 for (i = 0; i < nentries; i++) { 2792 int rate_idx = initial_rates[i].rate_idx; 2793 2794 if ((best_rssi >= initial_rates[i].rssi) && 2795 (BIT(rate_idx) & active_rate)) { 2796 rate->index = rate_idx; 2797 break; 2798 } 2799 } 2800 2801 out: 2802 rs_dump_rate(mvm, rate, "INITIAL"); 2803 } 2804 2805 /* Save info about RSSI of last Rx */ 2806 void rs_update_last_rssi(struct iwl_mvm *mvm, 2807 struct iwl_lq_sta *lq_sta, 2808 struct ieee80211_rx_status *rx_status) 2809 { 2810 int i; 2811 2812 lq_sta->pers.chains = rx_status->chains; 2813 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0]; 2814 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1]; 2815 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2]; 2816 lq_sta->pers.last_rssi = S8_MIN; 2817 2818 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { 2819 if (!(lq_sta->pers.chains & BIT(i))) 2820 continue; 2821 2822 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi) 2823 lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i]; 2824 } 2825 } 2826 2827 /** 2828 * rs_initialize_lq - Initialize a station's hardware rate table 2829 * 2830 * The uCode's station table contains a table of fallback rates 2831 * for automatic fallback during transmission. 2832 * 2833 * NOTE: This sets up a default set of values. These will be replaced later 2834 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of 2835 * rc80211_simple. 2836 * 2837 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before 2838 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD, 2839 * which requires station table entry to exist). 2840 */ 2841 static void rs_initialize_lq(struct iwl_mvm *mvm, 2842 struct ieee80211_sta *sta, 2843 struct iwl_lq_sta *lq_sta, 2844 enum nl80211_band band, 2845 bool init) 2846 { 2847 struct iwl_scale_tbl_info *tbl; 2848 struct rs_rate *rate; 2849 u8 active_tbl = 0; 2850 2851 if (!sta || !lq_sta) 2852 return; 2853 2854 if (!lq_sta->search_better_tbl) 2855 active_tbl = lq_sta->active_tbl; 2856 else 2857 active_tbl = 1 - lq_sta->active_tbl; 2858 2859 tbl = &(lq_sta->lq_info[active_tbl]); 2860 rate = &tbl->rate; 2861 2862 rs_get_initial_rate(mvm, sta, lq_sta, band, rate); 2863 rs_init_optimal_rate(mvm, sta, lq_sta); 2864 2865 WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B); 2866 tbl->column = rs_get_column_from_rate(rate); 2867 2868 rs_set_expected_tpt_table(lq_sta, tbl); 2869 rs_fill_lq_cmd(mvm, sta, lq_sta, rate); 2870 /* TODO restore station should remember the lq cmd */ 2871 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init); 2872 } 2873 2874 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta, 2875 struct ieee80211_tx_rate_control *txrc) 2876 { 2877 struct sk_buff *skb = txrc->skb; 2878 struct iwl_op_mode *op_mode __maybe_unused = 2879 (struct iwl_op_mode *)mvm_r; 2880 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 2881 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2882 struct iwl_lq_sta *lq_sta = mvm_sta; 2883 struct rs_rate *optimal_rate; 2884 u32 last_ucode_rate; 2885 2886 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) { 2887 /* if vif isn't initialized mvm doesn't know about 2888 * this station, so don't do anything with the it 2889 */ 2890 sta = NULL; 2891 mvm_sta = NULL; 2892 } 2893 2894 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2895 2896 /* Treat uninitialized rate scaling data same as non-existing. */ 2897 if (lq_sta && !lq_sta->pers.drv) { 2898 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n"); 2899 mvm_sta = NULL; 2900 } 2901 2902 /* Send management frames and NO_ACK data using lowest rate. */ 2903 if (rate_control_send_low(sta, mvm_sta, txrc)) 2904 return; 2905 2906 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags, 2907 info->band, &info->control.rates[0]); 2908 info->control.rates[0].count = 1; 2909 2910 /* Report the optimal rate based on rssi and STA caps if we haven't 2911 * converged yet (too little traffic) or exploring other modulations 2912 */ 2913 if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) { 2914 optimal_rate = rs_get_optimal_rate(mvm, lq_sta); 2915 last_ucode_rate = ucode_rate_from_rs_rate(mvm, 2916 optimal_rate); 2917 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band, 2918 &txrc->reported_rate); 2919 } 2920 } 2921 2922 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta, 2923 gfp_t gfp) 2924 { 2925 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta); 2926 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate; 2927 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 2928 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta; 2929 2930 IWL_DEBUG_RATE(mvm, "create station rate scale window\n"); 2931 2932 lq_sta->pers.drv = mvm; 2933 #ifdef CONFIG_MAC80211_DEBUGFS 2934 lq_sta->pers.dbg_fixed_rate = 0; 2935 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID; 2936 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 2937 #endif 2938 lq_sta->pers.chains = 0; 2939 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal)); 2940 lq_sta->pers.last_rssi = S8_MIN; 2941 2942 return &sta_priv->lq_sta; 2943 } 2944 2945 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap, 2946 int nss) 2947 { 2948 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) & 2949 (0x3 << (2 * (nss - 1))); 2950 rx_mcs >>= (2 * (nss - 1)); 2951 2952 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7) 2953 return IWL_RATE_MCS_7_INDEX; 2954 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8) 2955 return IWL_RATE_MCS_8_INDEX; 2956 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9) 2957 return IWL_RATE_MCS_9_INDEX; 2958 2959 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED); 2960 return -1; 2961 } 2962 2963 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta, 2964 struct ieee80211_sta_vht_cap *vht_cap, 2965 struct iwl_lq_sta *lq_sta) 2966 { 2967 int i; 2968 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1); 2969 2970 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 2971 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 2972 if (i == IWL_RATE_9M_INDEX) 2973 continue; 2974 2975 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 2976 if (i == IWL_RATE_MCS_9_INDEX && 2977 sta->bandwidth == IEEE80211_STA_RX_BW_20) 2978 continue; 2979 2980 lq_sta->active_siso_rate |= BIT(i); 2981 } 2982 } 2983 2984 if (sta->rx_nss < 2) 2985 return; 2986 2987 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2); 2988 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 2989 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 2990 if (i == IWL_RATE_9M_INDEX) 2991 continue; 2992 2993 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 2994 if (i == IWL_RATE_MCS_9_INDEX && 2995 sta->bandwidth == IEEE80211_STA_RX_BW_20) 2996 continue; 2997 2998 lq_sta->active_mimo2_rate |= BIT(i); 2999 } 3000 } 3001 } 3002 3003 static void rs_ht_init(struct iwl_mvm *mvm, 3004 struct ieee80211_sta *sta, 3005 struct iwl_lq_sta *lq_sta, 3006 struct ieee80211_sta_ht_cap *ht_cap) 3007 { 3008 /* active_siso_rate mask includes 9 MBits (bit 5), 3009 * and CCK (bits 0-3), supp_rates[] does not; 3010 * shift to convert format, force 9 MBits off. 3011 */ 3012 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1; 3013 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1; 3014 lq_sta->active_siso_rate &= ~((u16)0x2); 3015 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE; 3016 3017 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1; 3018 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1; 3019 lq_sta->active_mimo2_rate &= ~((u16)0x2); 3020 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE; 3021 3022 if (mvm->cfg->ht_params->ldpc && 3023 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING)) 3024 lq_sta->ldpc = true; 3025 3026 if (mvm->cfg->ht_params->stbc && 3027 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 3028 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC)) 3029 lq_sta->stbc_capable = true; 3030 3031 lq_sta->is_vht = false; 3032 } 3033 3034 static void rs_vht_init(struct iwl_mvm *mvm, 3035 struct ieee80211_sta *sta, 3036 struct iwl_lq_sta *lq_sta, 3037 struct ieee80211_sta_vht_cap *vht_cap) 3038 { 3039 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta); 3040 3041 if (mvm->cfg->ht_params->ldpc && 3042 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC)) 3043 lq_sta->ldpc = true; 3044 3045 if (mvm->cfg->ht_params->stbc && 3046 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 3047 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK)) 3048 lq_sta->stbc_capable = true; 3049 3050 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) && 3051 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 3052 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE)) 3053 lq_sta->bfer_capable = true; 3054 3055 lq_sta->is_vht = true; 3056 } 3057 3058 #ifdef CONFIG_IWLWIFI_DEBUGFS 3059 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm) 3060 { 3061 spin_lock_bh(&mvm->drv_stats_lock); 3062 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats)); 3063 spin_unlock_bh(&mvm->drv_stats_lock); 3064 } 3065 3066 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg) 3067 { 3068 u8 nss = 0; 3069 3070 spin_lock(&mvm->drv_stats_lock); 3071 3072 if (agg) 3073 mvm->drv_rx_stats.agg_frames++; 3074 3075 mvm->drv_rx_stats.success_frames++; 3076 3077 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { 3078 case RATE_MCS_CHAN_WIDTH_20: 3079 mvm->drv_rx_stats.bw_20_frames++; 3080 break; 3081 case RATE_MCS_CHAN_WIDTH_40: 3082 mvm->drv_rx_stats.bw_40_frames++; 3083 break; 3084 case RATE_MCS_CHAN_WIDTH_80: 3085 mvm->drv_rx_stats.bw_80_frames++; 3086 break; 3087 case RATE_MCS_CHAN_WIDTH_160: 3088 mvm->drv_rx_stats.bw_160_frames++; 3089 break; 3090 default: 3091 WARN_ONCE(1, "bad BW. rate 0x%x", rate); 3092 } 3093 3094 if (rate & RATE_MCS_HT_MSK) { 3095 mvm->drv_rx_stats.ht_frames++; 3096 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1; 3097 } else if (rate & RATE_MCS_VHT_MSK) { 3098 mvm->drv_rx_stats.vht_frames++; 3099 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >> 3100 RATE_VHT_MCS_NSS_POS) + 1; 3101 } else { 3102 mvm->drv_rx_stats.legacy_frames++; 3103 } 3104 3105 if (nss == 1) 3106 mvm->drv_rx_stats.siso_frames++; 3107 else if (nss == 2) 3108 mvm->drv_rx_stats.mimo2_frames++; 3109 3110 if (rate & RATE_MCS_SGI_MSK) 3111 mvm->drv_rx_stats.sgi_frames++; 3112 else 3113 mvm->drv_rx_stats.ngi_frames++; 3114 3115 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate; 3116 mvm->drv_rx_stats.last_frame_idx = 3117 (mvm->drv_rx_stats.last_frame_idx + 1) % 3118 ARRAY_SIZE(mvm->drv_rx_stats.last_rates); 3119 3120 spin_unlock(&mvm->drv_stats_lock); 3121 } 3122 #endif 3123 3124 /* 3125 * Called after adding a new station to initialize rate scaling 3126 */ 3127 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 3128 enum nl80211_band band, bool init) 3129 { 3130 int i, j; 3131 struct ieee80211_hw *hw = mvm->hw; 3132 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 3133 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; 3134 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta); 3135 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta; 3136 struct ieee80211_supported_band *sband; 3137 unsigned long supp; /* must be unsigned long for for_each_set_bit */ 3138 3139 /* clear all non-persistent lq data */ 3140 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers)); 3141 3142 sband = hw->wiphy->bands[band]; 3143 3144 lq_sta->lq.sta_id = sta_priv->sta_id; 3145 sta_priv->tlc_amsdu = false; 3146 3147 for (j = 0; j < LQ_SIZE; j++) 3148 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]); 3149 3150 lq_sta->flush_timer = 0; 3151 lq_sta->last_tx = jiffies; 3152 3153 IWL_DEBUG_RATE(mvm, 3154 "LQ: *** rate scale station global init for station %d ***\n", 3155 sta_priv->sta_id); 3156 /* TODO: what is a good starting rate for STA? About middle? Maybe not 3157 * the lowest or the highest rate.. Could consider using RSSI from 3158 * previous packets? Need to have IEEE 802.1X auth succeed immediately 3159 * after assoc.. */ 3160 3161 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX; 3162 lq_sta->band = sband->band; 3163 /* 3164 * active legacy rates as per supported rates bitmap 3165 */ 3166 supp = sta->supp_rates[sband->band]; 3167 lq_sta->active_legacy_rate = 0; 3168 for_each_set_bit(i, &supp, BITS_PER_LONG) 3169 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value); 3170 3171 /* TODO: should probably account for rx_highest for both HT/VHT */ 3172 if (!vht_cap || !vht_cap->vht_supported) 3173 rs_ht_init(mvm, sta, lq_sta, ht_cap); 3174 else 3175 rs_vht_init(mvm, sta, lq_sta, vht_cap); 3176 3177 lq_sta->max_legacy_rate_idx = 3178 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate); 3179 lq_sta->max_siso_rate_idx = 3180 rs_get_max_rate_from_mask(lq_sta->active_siso_rate); 3181 lq_sta->max_mimo2_rate_idx = 3182 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate); 3183 3184 IWL_DEBUG_RATE(mvm, 3185 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n", 3186 lq_sta->active_legacy_rate, 3187 lq_sta->active_siso_rate, 3188 lq_sta->active_mimo2_rate, 3189 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable, 3190 lq_sta->bfer_capable); 3191 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n", 3192 lq_sta->max_legacy_rate_idx, 3193 lq_sta->max_siso_rate_idx, 3194 lq_sta->max_mimo2_rate_idx); 3195 3196 /* These values will be overridden later */ 3197 lq_sta->lq.single_stream_ant_msk = 3198 first_antenna(iwl_mvm_get_valid_tx_ant(mvm)); 3199 lq_sta->lq.dual_stream_ant_msk = ANT_AB; 3200 3201 /* as default allow aggregation for all tids */ 3202 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID; 3203 lq_sta->is_agg = 0; 3204 #ifdef CONFIG_IWLWIFI_DEBUGFS 3205 iwl_mvm_reset_frame_stats(mvm); 3206 #endif 3207 rs_initialize_lq(mvm, sta, lq_sta, band, init); 3208 } 3209 3210 static void rs_rate_update(void *mvm_r, 3211 struct ieee80211_supported_band *sband, 3212 struct cfg80211_chan_def *chandef, 3213 struct ieee80211_sta *sta, void *priv_sta, 3214 u32 changed) 3215 { 3216 u8 tid; 3217 struct iwl_op_mode *op_mode = 3218 (struct iwl_op_mode *)mvm_r; 3219 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 3220 3221 if (!iwl_mvm_sta_from_mac80211(sta)->vif) 3222 return; 3223 3224 /* Stop any ongoing aggregations as rs starts off assuming no agg */ 3225 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++) 3226 ieee80211_stop_tx_ba_session(sta, tid); 3227 3228 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false); 3229 } 3230 3231 #ifdef CONFIG_MAC80211_DEBUGFS 3232 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm, 3233 struct iwl_lq_cmd *lq_cmd, 3234 enum nl80211_band band, 3235 u32 ucode_rate) 3236 { 3237 struct rs_rate rate; 3238 int i; 3239 int num_rates = ARRAY_SIZE(lq_cmd->rs_table); 3240 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate); 3241 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; 3242 3243 for (i = 0; i < num_rates; i++) 3244 lq_cmd->rs_table[i] = ucode_rate_le32; 3245 3246 rs_rate_from_ucode_rate(ucode_rate, band, &rate); 3247 3248 if (is_mimo(&rate)) 3249 lq_cmd->mimo_delim = num_rates - 1; 3250 else 3251 lq_cmd->mimo_delim = 0; 3252 3253 lq_cmd->reduced_tpc = 0; 3254 3255 if (num_of_ant(ant) == 1) 3256 lq_cmd->single_stream_ant_msk = ant; 3257 3258 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF; 3259 } 3260 #endif /* CONFIG_MAC80211_DEBUGFS */ 3261 3262 static void rs_fill_rates_for_column(struct iwl_mvm *mvm, 3263 struct iwl_lq_sta *lq_sta, 3264 struct rs_rate *rate, 3265 __le32 *rs_table, int *rs_table_index, 3266 int num_rates, int num_retries, 3267 u8 valid_tx_ant, bool toggle_ant) 3268 { 3269 int i, j; 3270 __le32 ucode_rate; 3271 bool bottom_reached = false; 3272 int prev_rate_idx = rate->index; 3273 int end = LINK_QUAL_MAX_RETRY_NUM; 3274 int index = *rs_table_index; 3275 3276 for (i = 0; i < num_rates && index < end; i++) { 3277 for (j = 0; j < num_retries && index < end; j++, index++) { 3278 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm, 3279 rate)); 3280 rs_table[index] = ucode_rate; 3281 if (toggle_ant) 3282 rs_toggle_antenna(valid_tx_ant, rate); 3283 } 3284 3285 prev_rate_idx = rate->index; 3286 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate); 3287 if (bottom_reached && !is_legacy(rate)) 3288 break; 3289 } 3290 3291 if (!bottom_reached && !is_legacy(rate)) 3292 rate->index = prev_rate_idx; 3293 3294 *rs_table_index = index; 3295 } 3296 3297 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI 3298 * column the rate table should look like this: 3299 * 3300 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 3301 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 3302 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 3303 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 3304 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 3305 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 3306 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI 3307 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI 3308 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI 3309 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps 3310 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps 3311 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps 3312 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps 3313 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps 3314 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps 3315 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps 3316 */ 3317 static void rs_build_rates_table(struct iwl_mvm *mvm, 3318 struct ieee80211_sta *sta, 3319 struct iwl_lq_sta *lq_sta, 3320 const struct rs_rate *initial_rate) 3321 { 3322 struct rs_rate rate; 3323 int num_rates, num_retries, index = 0; 3324 u8 valid_tx_ant = 0; 3325 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3326 bool toggle_ant = false; 3327 3328 memcpy(&rate, initial_rate, sizeof(rate)); 3329 3330 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 3331 3332 /* TODO: remove old API when min FW API hits 14 */ 3333 if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) && 3334 rs_stbc_allow(mvm, sta, lq_sta)) 3335 rate.stbc = true; 3336 3337 if (is_siso(&rate)) { 3338 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES; 3339 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3340 } else if (is_mimo(&rate)) { 3341 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES; 3342 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3343 } else { 3344 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES; 3345 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES; 3346 toggle_ant = true; 3347 } 3348 3349 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3350 num_rates, num_retries, valid_tx_ant, 3351 toggle_ant); 3352 3353 rs_get_lower_rate_down_column(lq_sta, &rate); 3354 3355 if (is_siso(&rate)) { 3356 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES; 3357 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES; 3358 lq_cmd->mimo_delim = index; 3359 } else if (is_legacy(&rate)) { 3360 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3361 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3362 } else { 3363 WARN_ON_ONCE(1); 3364 } 3365 3366 toggle_ant = true; 3367 3368 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3369 num_rates, num_retries, valid_tx_ant, 3370 toggle_ant); 3371 3372 rs_get_lower_rate_down_column(lq_sta, &rate); 3373 3374 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3375 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3376 3377 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3378 num_rates, num_retries, valid_tx_ant, 3379 toggle_ant); 3380 3381 } 3382 3383 struct rs_bfer_active_iter_data { 3384 struct ieee80211_sta *exclude_sta; 3385 struct iwl_mvm_sta *bfer_mvmsta; 3386 }; 3387 3388 static void rs_bfer_active_iter(void *_data, 3389 struct ieee80211_sta *sta) 3390 { 3391 struct rs_bfer_active_iter_data *data = _data; 3392 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3393 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq; 3394 u32 ss_params = le32_to_cpu(lq_cmd->ss_params); 3395 3396 if (sta == data->exclude_sta) 3397 return; 3398 3399 /* The current sta has BFER allowed */ 3400 if (ss_params & LQ_SS_BFER_ALLOWED) { 3401 WARN_ON_ONCE(data->bfer_mvmsta != NULL); 3402 3403 data->bfer_mvmsta = mvmsta; 3404 } 3405 } 3406 3407 static int rs_bfer_priority(struct iwl_mvm_sta *sta) 3408 { 3409 int prio = -1; 3410 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif); 3411 3412 switch (viftype) { 3413 case NL80211_IFTYPE_AP: 3414 case NL80211_IFTYPE_P2P_GO: 3415 prio = 3; 3416 break; 3417 case NL80211_IFTYPE_P2P_CLIENT: 3418 prio = 2; 3419 break; 3420 case NL80211_IFTYPE_STATION: 3421 prio = 1; 3422 break; 3423 default: 3424 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id); 3425 prio = -1; 3426 } 3427 3428 return prio; 3429 } 3430 3431 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */ 3432 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1, 3433 struct iwl_mvm_sta *sta2) 3434 { 3435 int prio1 = rs_bfer_priority(sta1); 3436 int prio2 = rs_bfer_priority(sta2); 3437 3438 if (prio1 > prio2) 3439 return 1; 3440 if (prio1 < prio2) 3441 return -1; 3442 return 0; 3443 } 3444 3445 static void rs_set_lq_ss_params(struct iwl_mvm *mvm, 3446 struct ieee80211_sta *sta, 3447 struct iwl_lq_sta *lq_sta, 3448 const struct rs_rate *initial_rate) 3449 { 3450 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3451 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3452 struct rs_bfer_active_iter_data data = { 3453 .exclude_sta = sta, 3454 .bfer_mvmsta = NULL, 3455 }; 3456 struct iwl_mvm_sta *bfer_mvmsta = NULL; 3457 u32 ss_params = LQ_SS_PARAMS_VALID; 3458 3459 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 3460 goto out; 3461 3462 #ifdef CONFIG_MAC80211_DEBUGFS 3463 /* Check if forcing the decision is configured. 3464 * Note that SISO is forced by not allowing STBC or BFER 3465 */ 3466 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC) 3467 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE); 3468 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER) 3469 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE); 3470 3471 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) { 3472 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n", 3473 lq_sta->pers.ss_force); 3474 goto out; 3475 } 3476 #endif 3477 3478 if (lq_sta->stbc_capable) 3479 ss_params |= LQ_SS_STBC_1SS_ALLOWED; 3480 3481 if (!lq_sta->bfer_capable) 3482 goto out; 3483 3484 ieee80211_iterate_stations_atomic(mvm->hw, 3485 rs_bfer_active_iter, 3486 &data); 3487 bfer_mvmsta = data.bfer_mvmsta; 3488 3489 /* This code is safe as it doesn't run concurrently for different 3490 * stations. This is guaranteed by the fact that calls to 3491 * ieee80211_tx_status wouldn't run concurrently for a single HW. 3492 */ 3493 if (!bfer_mvmsta) { 3494 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n"); 3495 3496 ss_params |= LQ_SS_BFER_ALLOWED; 3497 goto out; 3498 } 3499 3500 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n", 3501 bfer_mvmsta->sta_id); 3502 3503 /* Disallow BFER on another STA if active and we're a higher priority */ 3504 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) { 3505 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq; 3506 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params); 3507 3508 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED; 3509 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params); 3510 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false); 3511 3512 ss_params |= LQ_SS_BFER_ALLOWED; 3513 IWL_DEBUG_RATE(mvm, 3514 "Lower priority BFER sta found (%d). Switch BFER\n", 3515 bfer_mvmsta->sta_id); 3516 } 3517 out: 3518 lq_cmd->ss_params = cpu_to_le32(ss_params); 3519 } 3520 3521 static void rs_fill_lq_cmd(struct iwl_mvm *mvm, 3522 struct ieee80211_sta *sta, 3523 struct iwl_lq_sta *lq_sta, 3524 const struct rs_rate *initial_rate) 3525 { 3526 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3527 struct iwl_mvm_sta *mvmsta; 3528 struct iwl_mvm_vif *mvmvif; 3529 3530 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START; 3531 lq_cmd->agg_time_limit = 3532 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT); 3533 3534 #ifdef CONFIG_MAC80211_DEBUGFS 3535 if (lq_sta->pers.dbg_fixed_rate) { 3536 rs_build_rates_table_from_fixed(mvm, lq_cmd, 3537 lq_sta->band, 3538 lq_sta->pers.dbg_fixed_rate); 3539 return; 3540 } 3541 #endif 3542 if (WARN_ON_ONCE(!sta || !initial_rate)) 3543 return; 3544 3545 rs_build_rates_table(mvm, sta, lq_sta, initial_rate); 3546 3547 if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS)) 3548 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate); 3549 3550 mvmsta = iwl_mvm_sta_from_mac80211(sta); 3551 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif); 3552 3553 if (num_of_ant(initial_rate->ant) == 1) 3554 lq_cmd->single_stream_ant_msk = initial_rate->ant; 3555 3556 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize; 3557 3558 /* 3559 * In case of low latency, tell the firmware to leave a frame in the 3560 * Tx Fifo so that it can start a transaction in the same TxOP. This 3561 * basically allows the firmware to send bursts. 3562 */ 3563 if (iwl_mvm_vif_low_latency(mvmvif)) 3564 lq_cmd->agg_frame_cnt_limit--; 3565 3566 if (mvmsta->vif->p2p) 3567 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK; 3568 3569 lq_cmd->agg_time_limit = 3570 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta)); 3571 } 3572 3573 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) 3574 { 3575 return hw->priv; 3576 } 3577 /* rate scale requires free function to be implemented */ 3578 static void rs_free(void *mvm_rate) 3579 { 3580 return; 3581 } 3582 3583 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, 3584 void *mvm_sta) 3585 { 3586 struct iwl_op_mode *op_mode __maybe_unused = mvm_r; 3587 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 3588 3589 IWL_DEBUG_RATE(mvm, "enter\n"); 3590 IWL_DEBUG_RATE(mvm, "leave\n"); 3591 } 3592 3593 #ifdef CONFIG_MAC80211_DEBUGFS 3594 int rs_pretty_print_rate(char *buf, const u32 rate) 3595 { 3596 3597 char *type, *bw; 3598 u8 mcs = 0, nss = 0; 3599 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; 3600 3601 if (!(rate & RATE_MCS_HT_MSK) && 3602 !(rate & RATE_MCS_VHT_MSK)) { 3603 int index = iwl_hwrate_to_plcp_idx(rate); 3604 3605 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n", 3606 rs_pretty_ant(ant), 3607 index == IWL_RATE_INVALID ? "BAD" : 3608 iwl_rate_mcs[index].mbps); 3609 } 3610 3611 if (rate & RATE_MCS_VHT_MSK) { 3612 type = "VHT"; 3613 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK; 3614 nss = ((rate & RATE_VHT_MCS_NSS_MSK) 3615 >> RATE_VHT_MCS_NSS_POS) + 1; 3616 } else if (rate & RATE_MCS_HT_MSK) { 3617 type = "HT"; 3618 mcs = rate & RATE_HT_MCS_INDEX_MSK; 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%s\n", 3641 type, rs_pretty_ant(ant), bw, mcs, nss, 3642 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ", 3643 (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "", 3644 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "", 3645 (rate & RATE_MCS_BF_MSK) ? "BF " : "", 3646 (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : ""); 3647 } 3648 3649 /** 3650 * Program the device to use fixed rate for frame transmit 3651 * This is for debugging/testing only 3652 * once the device start use fixed rate, we need to reload the module 3653 * to being back the normal operation. 3654 */ 3655 static void rs_program_fix_rate(struct iwl_mvm *mvm, 3656 struct iwl_lq_sta *lq_sta) 3657 { 3658 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */ 3659 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3660 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3661 3662 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n", 3663 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate); 3664 3665 if (lq_sta->pers.dbg_fixed_rate) { 3666 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL); 3667 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false); 3668 } 3669 } 3670 3671 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file, 3672 const char __user *user_buf, size_t count, loff_t *ppos) 3673 { 3674 struct iwl_lq_sta *lq_sta = file->private_data; 3675 struct iwl_mvm *mvm; 3676 char buf[64]; 3677 size_t buf_size; 3678 u32 parsed_rate; 3679 3680 mvm = lq_sta->pers.drv; 3681 memset(buf, 0, sizeof(buf)); 3682 buf_size = min(count, sizeof(buf) - 1); 3683 if (copy_from_user(buf, user_buf, buf_size)) 3684 return -EFAULT; 3685 3686 if (sscanf(buf, "%x", &parsed_rate) == 1) 3687 lq_sta->pers.dbg_fixed_rate = parsed_rate; 3688 else 3689 lq_sta->pers.dbg_fixed_rate = 0; 3690 3691 rs_program_fix_rate(mvm, lq_sta); 3692 3693 return count; 3694 } 3695 3696 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file, 3697 char __user *user_buf, size_t count, loff_t *ppos) 3698 { 3699 char *buff; 3700 int desc = 0; 3701 int i = 0; 3702 ssize_t ret; 3703 3704 struct iwl_lq_sta *lq_sta = file->private_data; 3705 struct iwl_mvm_sta *mvmsta = 3706 container_of(lq_sta, struct iwl_mvm_sta, lq_sta); 3707 struct iwl_mvm *mvm; 3708 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 3709 struct rs_rate *rate = &tbl->rate; 3710 u32 ss_params; 3711 3712 mvm = lq_sta->pers.drv; 3713 buff = kmalloc(2048, GFP_KERNEL); 3714 if (!buff) 3715 return -ENOMEM; 3716 3717 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id); 3718 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n", 3719 lq_sta->total_failed, lq_sta->total_success, 3720 lq_sta->active_legacy_rate); 3721 desc += sprintf(buff+desc, "fixed rate 0x%X\n", 3722 lq_sta->pers.dbg_fixed_rate); 3723 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n", 3724 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "", 3725 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "", 3726 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : ""); 3727 desc += sprintf(buff+desc, "lq type %s\n", 3728 (is_legacy(rate)) ? "legacy" : 3729 is_vht(rate) ? "VHT" : "HT"); 3730 if (!is_legacy(rate)) { 3731 desc += sprintf(buff + desc, " %s", 3732 (is_siso(rate)) ? "SISO" : "MIMO2"); 3733 desc += sprintf(buff + desc, " %s", 3734 (is_ht20(rate)) ? "20MHz" : 3735 (is_ht40(rate)) ? "40MHz" : 3736 (is_ht80(rate)) ? "80MHz" : 3737 (is_ht160(rate)) ? "160MHz" : "BAD BW"); 3738 desc += sprintf(buff + desc, " %s %s %s %s\n", 3739 (rate->sgi) ? "SGI" : "NGI", 3740 (rate->ldpc) ? "LDPC" : "BCC", 3741 (lq_sta->is_agg) ? "AGG on" : "", 3742 (mvmsta->tlc_amsdu) ? "AMSDU on" : ""); 3743 } 3744 desc += sprintf(buff+desc, "last tx rate=0x%X\n", 3745 lq_sta->last_rate_n_flags); 3746 desc += sprintf(buff+desc, 3747 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n", 3748 lq_sta->lq.flags, 3749 lq_sta->lq.mimo_delim, 3750 lq_sta->lq.single_stream_ant_msk, 3751 lq_sta->lq.dual_stream_ant_msk); 3752 3753 desc += sprintf(buff+desc, 3754 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n", 3755 le16_to_cpu(lq_sta->lq.agg_time_limit), 3756 lq_sta->lq.agg_disable_start_th, 3757 lq_sta->lq.agg_frame_cnt_limit); 3758 3759 desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc); 3760 ss_params = le32_to_cpu(lq_sta->lq.ss_params); 3761 desc += sprintf(buff+desc, "single stream params: %s%s%s%s\n", 3762 (ss_params & LQ_SS_PARAMS_VALID) ? 3763 "VALID" : "INVALID", 3764 (ss_params & LQ_SS_BFER_ALLOWED) ? 3765 ", BFER" : "", 3766 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ? 3767 ", STBC" : "", 3768 (ss_params & LQ_SS_FORCE) ? 3769 ", FORCE" : ""); 3770 desc += sprintf(buff+desc, 3771 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n", 3772 lq_sta->lq.initial_rate_index[0], 3773 lq_sta->lq.initial_rate_index[1], 3774 lq_sta->lq.initial_rate_index[2], 3775 lq_sta->lq.initial_rate_index[3]); 3776 3777 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) { 3778 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]); 3779 3780 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r); 3781 desc += rs_pretty_print_rate(buff+desc, r); 3782 } 3783 3784 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3785 kfree(buff); 3786 return ret; 3787 } 3788 3789 static const struct file_operations rs_sta_dbgfs_scale_table_ops = { 3790 .write = rs_sta_dbgfs_scale_table_write, 3791 .read = rs_sta_dbgfs_scale_table_read, 3792 .open = simple_open, 3793 .llseek = default_llseek, 3794 }; 3795 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file, 3796 char __user *user_buf, size_t count, loff_t *ppos) 3797 { 3798 char *buff; 3799 int desc = 0; 3800 int i, j; 3801 ssize_t ret; 3802 struct iwl_scale_tbl_info *tbl; 3803 struct rs_rate *rate; 3804 struct iwl_lq_sta *lq_sta = file->private_data; 3805 3806 buff = kmalloc(1024, GFP_KERNEL); 3807 if (!buff) 3808 return -ENOMEM; 3809 3810 for (i = 0; i < LQ_SIZE; i++) { 3811 tbl = &(lq_sta->lq_info[i]); 3812 rate = &tbl->rate; 3813 desc += sprintf(buff+desc, 3814 "%s type=%d SGI=%d BW=%s DUP=0\n" 3815 "index=%d\n", 3816 lq_sta->active_tbl == i ? "*" : "x", 3817 rate->type, 3818 rate->sgi, 3819 is_ht20(rate) ? "20MHz" : 3820 is_ht40(rate) ? "40MHz" : 3821 is_ht80(rate) ? "80MHz" : 3822 is_ht160(rate) ? "160MHz" : "ERR", 3823 rate->index); 3824 for (j = 0; j < IWL_RATE_COUNT; j++) { 3825 desc += sprintf(buff+desc, 3826 "counter=%d success=%d %%=%d\n", 3827 tbl->win[j].counter, 3828 tbl->win[j].success_counter, 3829 tbl->win[j].success_ratio); 3830 } 3831 } 3832 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3833 kfree(buff); 3834 return ret; 3835 } 3836 3837 static const struct file_operations rs_sta_dbgfs_stats_table_ops = { 3838 .read = rs_sta_dbgfs_stats_table_read, 3839 .open = simple_open, 3840 .llseek = default_llseek, 3841 }; 3842 3843 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file, 3844 char __user *user_buf, 3845 size_t count, loff_t *ppos) 3846 { 3847 static const char * const column_name[] = { 3848 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A", 3849 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B", 3850 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A", 3851 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B", 3852 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI", 3853 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI", 3854 [RS_COLUMN_MIMO2] = "MIMO2", 3855 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI", 3856 }; 3857 3858 static const char * const rate_name[] = { 3859 [IWL_RATE_1M_INDEX] = "1M", 3860 [IWL_RATE_2M_INDEX] = "2M", 3861 [IWL_RATE_5M_INDEX] = "5.5M", 3862 [IWL_RATE_11M_INDEX] = "11M", 3863 [IWL_RATE_6M_INDEX] = "6M|MCS0", 3864 [IWL_RATE_9M_INDEX] = "9M", 3865 [IWL_RATE_12M_INDEX] = "12M|MCS1", 3866 [IWL_RATE_18M_INDEX] = "18M|MCS2", 3867 [IWL_RATE_24M_INDEX] = "24M|MCS3", 3868 [IWL_RATE_36M_INDEX] = "36M|MCS4", 3869 [IWL_RATE_48M_INDEX] = "48M|MCS5", 3870 [IWL_RATE_54M_INDEX] = "54M|MCS6", 3871 [IWL_RATE_MCS_7_INDEX] = "MCS7", 3872 [IWL_RATE_MCS_8_INDEX] = "MCS8", 3873 [IWL_RATE_MCS_9_INDEX] = "MCS9", 3874 }; 3875 3876 char *buff, *pos, *endpos; 3877 int col, rate; 3878 ssize_t ret; 3879 struct iwl_lq_sta *lq_sta = file->private_data; 3880 struct rs_rate_stats *stats; 3881 static const size_t bufsz = 1024; 3882 3883 buff = kmalloc(bufsz, GFP_KERNEL); 3884 if (!buff) 3885 return -ENOMEM; 3886 3887 pos = buff; 3888 endpos = pos + bufsz; 3889 3890 pos += scnprintf(pos, endpos - pos, "COLUMN,"); 3891 for (rate = 0; rate < IWL_RATE_COUNT; rate++) 3892 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]); 3893 pos += scnprintf(pos, endpos - pos, "\n"); 3894 3895 for (col = 0; col < RS_COLUMN_COUNT; col++) { 3896 pos += scnprintf(pos, endpos - pos, 3897 "%s,", column_name[col]); 3898 3899 for (rate = 0; rate < IWL_RATE_COUNT; rate++) { 3900 stats = &(lq_sta->pers.tx_stats[col][rate]); 3901 pos += scnprintf(pos, endpos - pos, 3902 "%llu/%llu,", 3903 stats->success, 3904 stats->total); 3905 } 3906 pos += scnprintf(pos, endpos - pos, "\n"); 3907 } 3908 3909 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff); 3910 kfree(buff); 3911 return ret; 3912 } 3913 3914 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file, 3915 const char __user *user_buf, 3916 size_t count, loff_t *ppos) 3917 { 3918 struct iwl_lq_sta *lq_sta = file->private_data; 3919 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats)); 3920 3921 return count; 3922 } 3923 3924 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = { 3925 .read = rs_sta_dbgfs_drv_tx_stats_read, 3926 .write = rs_sta_dbgfs_drv_tx_stats_write, 3927 .open = simple_open, 3928 .llseek = default_llseek, 3929 }; 3930 3931 static ssize_t iwl_dbgfs_ss_force_read(struct file *file, 3932 char __user *user_buf, 3933 size_t count, loff_t *ppos) 3934 { 3935 struct iwl_lq_sta *lq_sta = file->private_data; 3936 char buf[12]; 3937 int bufsz = sizeof(buf); 3938 int pos = 0; 3939 static const char * const ss_force_name[] = { 3940 [RS_SS_FORCE_NONE] = "none", 3941 [RS_SS_FORCE_STBC] = "stbc", 3942 [RS_SS_FORCE_BFER] = "bfer", 3943 [RS_SS_FORCE_SISO] = "siso", 3944 }; 3945 3946 pos += scnprintf(buf+pos, bufsz-pos, "%s\n", 3947 ss_force_name[lq_sta->pers.ss_force]); 3948 return simple_read_from_buffer(user_buf, count, ppos, buf, pos); 3949 } 3950 3951 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf, 3952 size_t count, loff_t *ppos) 3953 { 3954 struct iwl_mvm *mvm = lq_sta->pers.drv; 3955 int ret = 0; 3956 3957 if (!strncmp("none", buf, 4)) { 3958 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 3959 } else if (!strncmp("siso", buf, 4)) { 3960 lq_sta->pers.ss_force = RS_SS_FORCE_SISO; 3961 } else if (!strncmp("stbc", buf, 4)) { 3962 if (lq_sta->stbc_capable) { 3963 lq_sta->pers.ss_force = RS_SS_FORCE_STBC; 3964 } else { 3965 IWL_ERR(mvm, 3966 "can't force STBC. peer doesn't support\n"); 3967 ret = -EINVAL; 3968 } 3969 } else if (!strncmp("bfer", buf, 4)) { 3970 if (lq_sta->bfer_capable) { 3971 lq_sta->pers.ss_force = RS_SS_FORCE_BFER; 3972 } else { 3973 IWL_ERR(mvm, 3974 "can't force BFER. peer doesn't support\n"); 3975 ret = -EINVAL; 3976 } 3977 } else { 3978 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n"); 3979 ret = -EINVAL; 3980 } 3981 return ret ?: count; 3982 } 3983 3984 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \ 3985 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta) 3986 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \ 3987 if (!debugfs_create_file(#name, mode, parent, lq_sta, \ 3988 &iwl_dbgfs_##name##_ops)) \ 3989 goto err; \ 3990 } while (0) 3991 3992 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32); 3993 3994 static void rs_add_debugfs(void *mvm, void *priv_sta, struct dentry *dir) 3995 { 3996 struct iwl_lq_sta *lq_sta = priv_sta; 3997 struct iwl_mvm_sta *mvmsta; 3998 3999 mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta); 4000 4001 if (!mvmsta->vif) 4002 return; 4003 4004 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir, 4005 lq_sta, &rs_sta_dbgfs_scale_table_ops); 4006 debugfs_create_file("rate_stats_table", S_IRUSR, dir, 4007 lq_sta, &rs_sta_dbgfs_stats_table_ops); 4008 debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir, 4009 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops); 4010 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir, 4011 &lq_sta->tx_agg_tid_en); 4012 debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir, 4013 &lq_sta->pers.dbg_fixed_txp_reduction); 4014 4015 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR); 4016 return; 4017 err: 4018 IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n"); 4019 } 4020 4021 static void rs_remove_debugfs(void *mvm, void *mvm_sta) 4022 { 4023 } 4024 #endif 4025 4026 /* 4027 * Initialization of rate scaling information is done by driver after 4028 * the station is added. Since mac80211 calls this function before a 4029 * station is added we ignore it. 4030 */ 4031 static void rs_rate_init_stub(void *mvm_r, 4032 struct ieee80211_supported_band *sband, 4033 struct cfg80211_chan_def *chandef, 4034 struct ieee80211_sta *sta, void *mvm_sta) 4035 { 4036 } 4037 4038 static const struct rate_control_ops rs_mvm_ops = { 4039 .name = RS_NAME, 4040 .tx_status = rs_mac80211_tx_status, 4041 .get_rate = rs_get_rate, 4042 .rate_init = rs_rate_init_stub, 4043 .alloc = rs_alloc, 4044 .free = rs_free, 4045 .alloc_sta = rs_alloc_sta, 4046 .free_sta = rs_free_sta, 4047 .rate_update = rs_rate_update, 4048 #ifdef CONFIG_MAC80211_DEBUGFS 4049 .add_sta_debugfs = rs_add_debugfs, 4050 .remove_sta_debugfs = rs_remove_debugfs, 4051 #endif 4052 }; 4053 4054 int iwl_mvm_rate_control_register(void) 4055 { 4056 return ieee80211_rate_control_register(&rs_mvm_ops); 4057 } 4058 4059 void iwl_mvm_rate_control_unregister(void) 4060 { 4061 ieee80211_rate_control_unregister(&rs_mvm_ops); 4062 } 4063 4064 /** 4065 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable 4066 * Tx protection, according to this request and previous requests, 4067 * and send the LQ command. 4068 * @mvmsta: The station 4069 * @enable: Enable Tx protection? 4070 */ 4071 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 4072 bool enable) 4073 { 4074 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq; 4075 4076 lockdep_assert_held(&mvm->mutex); 4077 4078 if (enable) { 4079 if (mvmsta->tx_protection == 0) 4080 lq->flags |= LQ_FLAG_USE_RTS_MSK; 4081 mvmsta->tx_protection++; 4082 } else { 4083 mvmsta->tx_protection--; 4084 if (mvmsta->tx_protection == 0) 4085 lq->flags &= ~LQ_FLAG_USE_RTS_MSK; 4086 } 4087 4088 return iwl_mvm_send_lq_cmd(mvm, lq, false); 4089 } 4090