1 /****************************************************************************** 2 * 3 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved. 4 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH 5 * Copyright(c) 2016 - 2017 Intel Deutschland GmbH 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of version 2 of the GNU General Public License as 9 * published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 14 * more details. 15 * 16 * You should have received a copy of the GNU General Public License along with 17 * this program; if not, write to the Free Software Foundation, Inc., 18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA 19 * 20 * The full GNU General Public License is included in this distribution in the 21 * file called LICENSE. 22 * 23 * Contact Information: 24 * Intel Linux Wireless <linuxwifi@intel.com> 25 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 26 * 27 *****************************************************************************/ 28 #include <linux/kernel.h> 29 #include <linux/skbuff.h> 30 #include <linux/slab.h> 31 #include <net/mac80211.h> 32 33 #include <linux/netdevice.h> 34 #include <linux/etherdevice.h> 35 #include <linux/delay.h> 36 37 #include <linux/workqueue.h> 38 #include "rs.h" 39 #include "fw-api.h" 40 #include "sta.h" 41 #include "iwl-op-mode.h" 42 #include "mvm.h" 43 #include "debugfs.h" 44 45 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */ 46 47 /* Calculations of success ratio are done in fixed point where 12800 is 100%. 48 * Use this macro when dealing with thresholds consts set as a percentage 49 */ 50 #define RS_PERCENT(x) (128 * x) 51 52 static u8 rs_ht_to_legacy[] = { 53 [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX, 54 [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX, 55 [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX, 56 [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX, 57 [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX, 58 [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX, 59 [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX, 60 [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX, 61 [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX, 62 [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX, 63 }; 64 65 static const u8 ant_toggle_lookup[] = { 66 [ANT_NONE] = ANT_NONE, 67 [ANT_A] = ANT_B, 68 [ANT_B] = ANT_A, 69 [ANT_AB] = ANT_AB, 70 }; 71 72 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \ 73 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \ 74 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \ 75 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \ 76 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \ 77 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\ 78 IWL_RATE_##rp##M_INDEX, \ 79 IWL_RATE_##rn##M_INDEX } 80 81 #define IWL_DECLARE_MCS_RATE(s) \ 82 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \ 83 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \ 84 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \ 85 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \ 86 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \ 87 IWL_RATE_INVM_INDEX, \ 88 IWL_RATE_INVM_INDEX } 89 90 /* 91 * Parameter order: 92 * rate, ht rate, prev rate, next rate 93 * 94 * If there isn't a valid next or previous rate then INV is used which 95 * maps to IWL_RATE_INVALID 96 * 97 */ 98 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = { 99 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */ 100 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */ 101 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */ 102 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */ 103 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */ 104 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */ 105 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */ 106 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */ 107 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */ 108 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */ 109 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */ 110 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */ 111 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */ 112 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */ 113 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */ 114 }; 115 116 enum rs_action { 117 RS_ACTION_STAY = 0, 118 RS_ACTION_DOWNSCALE = -1, 119 RS_ACTION_UPSCALE = 1, 120 }; 121 122 enum rs_column_mode { 123 RS_INVALID = 0, 124 RS_LEGACY, 125 RS_SISO, 126 RS_MIMO2, 127 }; 128 129 #define MAX_NEXT_COLUMNS 7 130 #define MAX_COLUMN_CHECKS 3 131 132 struct rs_tx_column; 133 134 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm, 135 struct ieee80211_sta *sta, 136 struct rs_rate *rate, 137 const struct rs_tx_column *next_col); 138 139 struct rs_tx_column { 140 enum rs_column_mode mode; 141 u8 ant; 142 bool sgi; 143 enum rs_column next_columns[MAX_NEXT_COLUMNS]; 144 allow_column_func_t checks[MAX_COLUMN_CHECKS]; 145 }; 146 147 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 148 struct rs_rate *rate, 149 const struct rs_tx_column *next_col) 150 { 151 return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant); 152 } 153 154 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 155 struct rs_rate *rate, 156 const struct rs_tx_column *next_col) 157 { 158 if (!sta->ht_cap.ht_supported) 159 return false; 160 161 if (sta->smps_mode == IEEE80211_SMPS_STATIC) 162 return false; 163 164 if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2) 165 return false; 166 167 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 168 return false; 169 170 if (mvm->nvm_data->sku_cap_mimo_disabled) 171 return false; 172 173 return true; 174 } 175 176 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 177 struct rs_rate *rate, 178 const struct rs_tx_column *next_col) 179 { 180 if (!sta->ht_cap.ht_supported) 181 return false; 182 183 return true; 184 } 185 186 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 187 struct rs_rate *rate, 188 const struct rs_tx_column *next_col) 189 { 190 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 191 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; 192 193 if (is_ht20(rate) && (ht_cap->cap & 194 IEEE80211_HT_CAP_SGI_20)) 195 return true; 196 if (is_ht40(rate) && (ht_cap->cap & 197 IEEE80211_HT_CAP_SGI_40)) 198 return true; 199 if (is_ht80(rate) && (vht_cap->cap & 200 IEEE80211_VHT_CAP_SHORT_GI_80)) 201 return true; 202 if (is_ht160(rate) && (vht_cap->cap & 203 IEEE80211_VHT_CAP_SHORT_GI_160)) 204 return true; 205 206 return false; 207 } 208 209 static const struct rs_tx_column rs_tx_columns[] = { 210 [RS_COLUMN_LEGACY_ANT_A] = { 211 .mode = RS_LEGACY, 212 .ant = ANT_A, 213 .next_columns = { 214 RS_COLUMN_LEGACY_ANT_B, 215 RS_COLUMN_SISO_ANT_A, 216 RS_COLUMN_MIMO2, 217 RS_COLUMN_INVALID, 218 RS_COLUMN_INVALID, 219 RS_COLUMN_INVALID, 220 RS_COLUMN_INVALID, 221 }, 222 .checks = { 223 rs_ant_allow, 224 }, 225 }, 226 [RS_COLUMN_LEGACY_ANT_B] = { 227 .mode = RS_LEGACY, 228 .ant = ANT_B, 229 .next_columns = { 230 RS_COLUMN_LEGACY_ANT_A, 231 RS_COLUMN_SISO_ANT_B, 232 RS_COLUMN_MIMO2, 233 RS_COLUMN_INVALID, 234 RS_COLUMN_INVALID, 235 RS_COLUMN_INVALID, 236 RS_COLUMN_INVALID, 237 }, 238 .checks = { 239 rs_ant_allow, 240 }, 241 }, 242 [RS_COLUMN_SISO_ANT_A] = { 243 .mode = RS_SISO, 244 .ant = ANT_A, 245 .next_columns = { 246 RS_COLUMN_SISO_ANT_B, 247 RS_COLUMN_MIMO2, 248 RS_COLUMN_SISO_ANT_A_SGI, 249 RS_COLUMN_LEGACY_ANT_A, 250 RS_COLUMN_LEGACY_ANT_B, 251 RS_COLUMN_INVALID, 252 RS_COLUMN_INVALID, 253 }, 254 .checks = { 255 rs_siso_allow, 256 rs_ant_allow, 257 }, 258 }, 259 [RS_COLUMN_SISO_ANT_B] = { 260 .mode = RS_SISO, 261 .ant = ANT_B, 262 .next_columns = { 263 RS_COLUMN_SISO_ANT_A, 264 RS_COLUMN_MIMO2, 265 RS_COLUMN_SISO_ANT_B_SGI, 266 RS_COLUMN_LEGACY_ANT_A, 267 RS_COLUMN_LEGACY_ANT_B, 268 RS_COLUMN_INVALID, 269 RS_COLUMN_INVALID, 270 }, 271 .checks = { 272 rs_siso_allow, 273 rs_ant_allow, 274 }, 275 }, 276 [RS_COLUMN_SISO_ANT_A_SGI] = { 277 .mode = RS_SISO, 278 .ant = ANT_A, 279 .sgi = true, 280 .next_columns = { 281 RS_COLUMN_SISO_ANT_B_SGI, 282 RS_COLUMN_MIMO2_SGI, 283 RS_COLUMN_SISO_ANT_A, 284 RS_COLUMN_LEGACY_ANT_A, 285 RS_COLUMN_LEGACY_ANT_B, 286 RS_COLUMN_INVALID, 287 RS_COLUMN_INVALID, 288 }, 289 .checks = { 290 rs_siso_allow, 291 rs_ant_allow, 292 rs_sgi_allow, 293 }, 294 }, 295 [RS_COLUMN_SISO_ANT_B_SGI] = { 296 .mode = RS_SISO, 297 .ant = ANT_B, 298 .sgi = true, 299 .next_columns = { 300 RS_COLUMN_SISO_ANT_A_SGI, 301 RS_COLUMN_MIMO2_SGI, 302 RS_COLUMN_SISO_ANT_B, 303 RS_COLUMN_LEGACY_ANT_A, 304 RS_COLUMN_LEGACY_ANT_B, 305 RS_COLUMN_INVALID, 306 RS_COLUMN_INVALID, 307 }, 308 .checks = { 309 rs_siso_allow, 310 rs_ant_allow, 311 rs_sgi_allow, 312 }, 313 }, 314 [RS_COLUMN_MIMO2] = { 315 .mode = RS_MIMO2, 316 .ant = ANT_AB, 317 .next_columns = { 318 RS_COLUMN_SISO_ANT_A, 319 RS_COLUMN_MIMO2_SGI, 320 RS_COLUMN_LEGACY_ANT_A, 321 RS_COLUMN_LEGACY_ANT_B, 322 RS_COLUMN_INVALID, 323 RS_COLUMN_INVALID, 324 RS_COLUMN_INVALID, 325 }, 326 .checks = { 327 rs_mimo_allow, 328 }, 329 }, 330 [RS_COLUMN_MIMO2_SGI] = { 331 .mode = RS_MIMO2, 332 .ant = ANT_AB, 333 .sgi = true, 334 .next_columns = { 335 RS_COLUMN_SISO_ANT_A_SGI, 336 RS_COLUMN_MIMO2, 337 RS_COLUMN_LEGACY_ANT_A, 338 RS_COLUMN_LEGACY_ANT_B, 339 RS_COLUMN_INVALID, 340 RS_COLUMN_INVALID, 341 RS_COLUMN_INVALID, 342 }, 343 .checks = { 344 rs_mimo_allow, 345 rs_sgi_allow, 346 }, 347 }, 348 }; 349 350 static inline u8 rs_extract_rate(u32 rate_n_flags) 351 { 352 /* also works for HT because bits 7:6 are zero there */ 353 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK); 354 } 355 356 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags) 357 { 358 int idx = 0; 359 360 if (rate_n_flags & RATE_MCS_HT_MSK) { 361 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK; 362 idx += IWL_RATE_MCS_0_INDEX; 363 364 /* skip 9M not supported in HT*/ 365 if (idx >= IWL_RATE_9M_INDEX) 366 idx += 1; 367 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE)) 368 return idx; 369 } else if (rate_n_flags & RATE_MCS_VHT_MSK) { 370 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK; 371 idx += IWL_RATE_MCS_0_INDEX; 372 373 /* skip 9M not supported in VHT*/ 374 if (idx >= IWL_RATE_9M_INDEX) 375 idx++; 376 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE)) 377 return idx; 378 } else { 379 /* legacy rate format, search for match in table */ 380 381 u8 legacy_rate = rs_extract_rate(rate_n_flags); 382 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++) 383 if (iwl_rates[idx].plcp == legacy_rate) 384 return idx; 385 } 386 387 return IWL_RATE_INVALID; 388 } 389 390 static void rs_rate_scale_perform(struct iwl_mvm *mvm, 391 struct ieee80211_sta *sta, 392 struct iwl_lq_sta *lq_sta, 393 int tid, bool ndp); 394 static void rs_fill_lq_cmd(struct iwl_mvm *mvm, 395 struct ieee80211_sta *sta, 396 struct iwl_lq_sta *lq_sta, 397 const struct rs_rate *initial_rate); 398 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search); 399 400 /** 401 * The following tables contain the expected throughput metrics for all rates 402 * 403 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits 404 * 405 * where invalid entries are zeros. 406 * 407 * CCK rates are only valid in legacy table and will only be used in G 408 * (2.4 GHz) band. 409 */ 410 411 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = { 412 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0 413 }; 414 415 /* Expected TpT tables. 4 indexes: 416 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI 417 */ 418 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = { 419 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0}, 420 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0}, 421 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0}, 422 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0}, 423 }; 424 425 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = { 426 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275}, 427 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280}, 428 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173}, 429 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284}, 430 }; 431 432 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = { 433 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308}, 434 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312}, 435 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466}, 436 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691}, 437 }; 438 439 static const u16 expected_tpt_siso_160MHz[4][IWL_RATE_COUNT] = { 440 {0, 0, 0, 0, 191, 0, 244, 288, 298, 308, 313, 318, 323, 328, 330}, 441 {0, 0, 0, 0, 200, 0, 251, 293, 302, 312, 317, 322, 327, 332, 334}, 442 {0, 0, 0, 0, 439, 0, 875, 1307, 1736, 2584, 3419, 3831, 4240, 5049, 5581}, 443 {0, 0, 0, 0, 488, 0, 972, 1451, 1925, 2864, 3785, 4240, 4691, 5581, 6165}, 444 }; 445 446 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = { 447 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0}, 448 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0}, 449 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0}, 450 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0}, 451 }; 452 453 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = { 454 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300}, 455 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303}, 456 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053}, 457 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221}, 458 }; 459 460 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = { 461 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319}, 462 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320}, 463 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219}, 464 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545}, 465 }; 466 467 static const u16 expected_tpt_mimo2_160MHz[4][IWL_RATE_COUNT] = { 468 {0, 0, 0, 0, 240, 0, 278, 308, 313, 319, 322, 324, 328, 330, 334}, 469 {0, 0, 0, 0, 247, 0, 282, 310, 315, 320, 323, 325, 329, 332, 338}, 470 {0, 0, 0, 0, 875, 0, 1735, 2582, 3414, 5043, 6619, 7389, 8147, 9629, 10592}, 471 {0, 0, 0, 0, 971, 0, 1925, 2861, 3779, 5574, 7304, 8147, 8976, 10592, 11640}, 472 }; 473 474 /* mbps, mcs */ 475 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = { 476 { "1", "BPSK DSSS"}, 477 { "2", "QPSK DSSS"}, 478 {"5.5", "BPSK CCK"}, 479 { "11", "QPSK CCK"}, 480 { "6", "BPSK 1/2"}, 481 { "9", "BPSK 1/2"}, 482 { "12", "QPSK 1/2"}, 483 { "18", "QPSK 3/4"}, 484 { "24", "16QAM 1/2"}, 485 { "36", "16QAM 3/4"}, 486 { "48", "64QAM 2/3"}, 487 { "54", "64QAM 3/4"}, 488 { "60", "64QAM 5/6"}, 489 }; 490 491 #define MCS_INDEX_PER_STREAM (8) 492 493 static const char *rs_pretty_ant(u8 ant) 494 { 495 static const char * const ant_name[] = { 496 [ANT_NONE] = "None", 497 [ANT_A] = "A", 498 [ANT_B] = "B", 499 [ANT_AB] = "AB", 500 [ANT_C] = "C", 501 [ANT_AC] = "AC", 502 [ANT_BC] = "BC", 503 [ANT_ABC] = "ABC", 504 }; 505 506 if (ant > ANT_ABC) 507 return "UNKNOWN"; 508 509 return ant_name[ant]; 510 } 511 512 static const char *rs_pretty_lq_type(enum iwl_table_type type) 513 { 514 static const char * const lq_types[] = { 515 [LQ_NONE] = "NONE", 516 [LQ_LEGACY_A] = "LEGACY_A", 517 [LQ_LEGACY_G] = "LEGACY_G", 518 [LQ_HT_SISO] = "HT SISO", 519 [LQ_HT_MIMO2] = "HT MIMO", 520 [LQ_VHT_SISO] = "VHT SISO", 521 [LQ_VHT_MIMO2] = "VHT MIMO", 522 }; 523 524 if (type < LQ_NONE || type >= LQ_MAX) 525 return "UNKNOWN"; 526 527 return lq_types[type]; 528 } 529 530 static char *rs_pretty_rate(const struct rs_rate *rate) 531 { 532 static char buf[40]; 533 static const char * const legacy_rates[] = { 534 [IWL_RATE_1M_INDEX] = "1M", 535 [IWL_RATE_2M_INDEX] = "2M", 536 [IWL_RATE_5M_INDEX] = "5.5M", 537 [IWL_RATE_11M_INDEX] = "11M", 538 [IWL_RATE_6M_INDEX] = "6M", 539 [IWL_RATE_9M_INDEX] = "9M", 540 [IWL_RATE_12M_INDEX] = "12M", 541 [IWL_RATE_18M_INDEX] = "18M", 542 [IWL_RATE_24M_INDEX] = "24M", 543 [IWL_RATE_36M_INDEX] = "36M", 544 [IWL_RATE_48M_INDEX] = "48M", 545 [IWL_RATE_54M_INDEX] = "54M", 546 }; 547 static const char *const ht_vht_rates[] = { 548 [IWL_RATE_MCS_0_INDEX] = "MCS0", 549 [IWL_RATE_MCS_1_INDEX] = "MCS1", 550 [IWL_RATE_MCS_2_INDEX] = "MCS2", 551 [IWL_RATE_MCS_3_INDEX] = "MCS3", 552 [IWL_RATE_MCS_4_INDEX] = "MCS4", 553 [IWL_RATE_MCS_5_INDEX] = "MCS5", 554 [IWL_RATE_MCS_6_INDEX] = "MCS6", 555 [IWL_RATE_MCS_7_INDEX] = "MCS7", 556 [IWL_RATE_MCS_8_INDEX] = "MCS8", 557 [IWL_RATE_MCS_9_INDEX] = "MCS9", 558 }; 559 const char *rate_str; 560 561 if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX)) 562 rate_str = legacy_rates[rate->index]; 563 else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) && 564 (rate->index >= IWL_RATE_MCS_0_INDEX) && 565 (rate->index <= IWL_RATE_MCS_9_INDEX)) 566 rate_str = ht_vht_rates[rate->index]; 567 else 568 rate_str = "BAD_RATE"; 569 570 sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type), 571 rs_pretty_ant(rate->ant), rate_str); 572 return buf; 573 } 574 575 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate, 576 const char *prefix) 577 { 578 IWL_DEBUG_RATE(mvm, 579 "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n", 580 prefix, rs_pretty_rate(rate), rate->bw, 581 rate->sgi, rate->ldpc, rate->stbc); 582 } 583 584 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window) 585 { 586 window->data = 0; 587 window->success_counter = 0; 588 window->success_ratio = IWL_INVALID_VALUE; 589 window->counter = 0; 590 window->average_tpt = IWL_INVALID_VALUE; 591 } 592 593 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm, 594 struct iwl_scale_tbl_info *tbl) 595 { 596 int i; 597 598 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n"); 599 for (i = 0; i < IWL_RATE_COUNT; i++) 600 rs_rate_scale_clear_window(&tbl->win[i]); 601 602 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++) 603 rs_rate_scale_clear_window(&tbl->tpc_win[i]); 604 } 605 606 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type) 607 { 608 return (ant_type & valid_antenna) == ant_type; 609 } 610 611 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm, 612 struct iwl_lq_sta *lq_data, u8 tid, 613 struct ieee80211_sta *sta) 614 { 615 int ret = -EAGAIN; 616 617 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n", 618 sta->addr, tid); 619 620 /* start BA session until the peer sends del BA */ 621 ret = ieee80211_start_tx_ba_session(sta, tid, 0); 622 if (ret == -EAGAIN) { 623 /* 624 * driver and mac80211 is out of sync 625 * this might be cause by reloading firmware 626 * stop the tx ba session here 627 */ 628 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n", 629 tid); 630 ieee80211_stop_tx_ba_session(sta, tid); 631 } 632 return ret; 633 } 634 635 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 636 u8 tid, struct iwl_lq_sta *lq_sta, 637 struct ieee80211_sta *sta) 638 { 639 struct iwl_mvm_tid_data *tid_data; 640 641 /* 642 * In AP mode, tid can be equal to IWL_MAX_TID_COUNT 643 * when the frame is not QoS 644 */ 645 if (WARN_ON_ONCE(tid > IWL_MAX_TID_COUNT)) { 646 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n", 647 tid, IWL_MAX_TID_COUNT); 648 return; 649 } else if (tid == IWL_MAX_TID_COUNT) { 650 return; 651 } 652 653 tid_data = &mvmsta->tid_data[tid]; 654 if ((tid_data->state == IWL_AGG_OFF) && 655 (lq_sta->tx_agg_tid_en & BIT(tid)) && 656 (tid_data->tx_count_last >= IWL_MVM_RS_AGG_START_THRESHOLD)) { 657 IWL_DEBUG_RATE(mvm, "try to aggregate tid %d\n", tid); 658 if (rs_tl_turn_on_agg_for_tid(mvm, lq_sta, tid, sta) == 0) 659 tid_data->state = IWL_AGG_QUEUED; 660 } 661 } 662 663 static inline int get_num_of_ant_from_rate(u32 rate_n_flags) 664 { 665 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) + 666 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) + 667 !!(rate_n_flags & RATE_MCS_ANT_C_MSK); 668 } 669 670 /* 671 * Static function to get the expected throughput from an iwl_scale_tbl_info 672 * that wraps a NULL pointer check 673 */ 674 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index) 675 { 676 if (tbl->expected_tpt) 677 return tbl->expected_tpt[rs_index]; 678 return 0; 679 } 680 681 /** 682 * rs_collect_tx_data - Update the success/failure sliding window 683 * 684 * We keep a sliding window of the last 62 packets transmitted 685 * at this rate. window->data contains the bitmask of successful 686 * packets. 687 */ 688 static int _rs_collect_tx_data(struct iwl_mvm *mvm, 689 struct iwl_scale_tbl_info *tbl, 690 int scale_index, int attempts, int successes, 691 struct iwl_rate_scale_data *window) 692 { 693 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1)); 694 s32 fail_count, tpt; 695 696 /* Get expected throughput */ 697 tpt = get_expected_tpt(tbl, scale_index); 698 699 /* 700 * Keep track of only the latest 62 tx frame attempts in this rate's 701 * history window; anything older isn't really relevant any more. 702 * If we have filled up the sliding window, drop the oldest attempt; 703 * if the oldest attempt (highest bit in bitmap) shows "success", 704 * subtract "1" from the success counter (this is the main reason 705 * we keep these bitmaps!). 706 */ 707 while (attempts > 0) { 708 if (window->counter >= IWL_RATE_MAX_WINDOW) { 709 /* remove earliest */ 710 window->counter = IWL_RATE_MAX_WINDOW - 1; 711 712 if (window->data & mask) { 713 window->data &= ~mask; 714 window->success_counter--; 715 } 716 } 717 718 /* Increment frames-attempted counter */ 719 window->counter++; 720 721 /* Shift bitmap by one frame to throw away oldest history */ 722 window->data <<= 1; 723 724 /* Mark the most recent #successes attempts as successful */ 725 if (successes > 0) { 726 window->success_counter++; 727 window->data |= 0x1; 728 successes--; 729 } 730 731 attempts--; 732 } 733 734 /* Calculate current success ratio, avoid divide-by-0! */ 735 if (window->counter > 0) 736 window->success_ratio = 128 * (100 * window->success_counter) 737 / window->counter; 738 else 739 window->success_ratio = IWL_INVALID_VALUE; 740 741 fail_count = window->counter - window->success_counter; 742 743 /* Calculate average throughput, if we have enough history. */ 744 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) || 745 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) 746 window->average_tpt = (window->success_ratio * tpt + 64) / 128; 747 else 748 window->average_tpt = IWL_INVALID_VALUE; 749 750 return 0; 751 } 752 753 static int rs_collect_tpc_data(struct iwl_mvm *mvm, 754 struct iwl_lq_sta *lq_sta, 755 struct iwl_scale_tbl_info *tbl, 756 int scale_index, int attempts, int successes, 757 u8 reduced_txp) 758 { 759 struct iwl_rate_scale_data *window = NULL; 760 761 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION)) 762 return -EINVAL; 763 764 window = &tbl->tpc_win[reduced_txp]; 765 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes, 766 window); 767 } 768 769 static void rs_update_tid_tpt_stats(struct iwl_mvm *mvm, 770 struct iwl_mvm_sta *mvmsta, 771 u8 tid, int successes) 772 { 773 struct iwl_mvm_tid_data *tid_data; 774 775 if (tid >= IWL_MAX_TID_COUNT) 776 return; 777 778 tid_data = &mvmsta->tid_data[tid]; 779 780 /* 781 * Measure if there're enough successful transmits per second. 782 * These statistics are used only to decide if we can start a 783 * BA session, so it should be updated only when A-MPDU is 784 * off. 785 */ 786 if (tid_data->state != IWL_AGG_OFF) 787 return; 788 789 if (time_is_before_jiffies(tid_data->tpt_meas_start + HZ) || 790 (tid_data->tx_count >= IWL_MVM_RS_AGG_START_THRESHOLD)) { 791 tid_data->tx_count_last = tid_data->tx_count; 792 tid_data->tx_count = 0; 793 tid_data->tpt_meas_start = jiffies; 794 } else { 795 tid_data->tx_count += successes; 796 } 797 } 798 799 static int rs_collect_tlc_data(struct iwl_mvm *mvm, 800 struct iwl_mvm_sta *mvmsta, u8 tid, 801 struct iwl_scale_tbl_info *tbl, 802 int scale_index, int attempts, int successes) 803 { 804 struct iwl_rate_scale_data *window = NULL; 805 806 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT) 807 return -EINVAL; 808 809 if (tbl->column != RS_COLUMN_INVALID) { 810 struct lq_sta_pers *pers = &mvmsta->lq_sta.rs_drv.pers; 811 812 pers->tx_stats[tbl->column][scale_index].total += attempts; 813 pers->tx_stats[tbl->column][scale_index].success += successes; 814 } 815 816 rs_update_tid_tpt_stats(mvm, mvmsta, tid, successes); 817 818 /* Select window for current tx bit rate */ 819 window = &(tbl->win[scale_index]); 820 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes, 821 window); 822 } 823 824 /* Convert rs_rate object into ucode rate bitmask */ 825 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm, 826 struct rs_rate *rate) 827 { 828 u32 ucode_rate = 0; 829 int index = rate->index; 830 831 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) & 832 RATE_MCS_ANT_ABC_MSK); 833 834 if (is_legacy(rate)) { 835 ucode_rate |= iwl_rates[index].plcp; 836 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE) 837 ucode_rate |= RATE_MCS_CCK_MSK; 838 return ucode_rate; 839 } 840 841 if (is_ht(rate)) { 842 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) { 843 IWL_ERR(mvm, "Invalid HT rate index %d\n", index); 844 index = IWL_LAST_HT_RATE; 845 } 846 ucode_rate |= RATE_MCS_HT_MSK; 847 848 if (is_ht_siso(rate)) 849 ucode_rate |= iwl_rates[index].plcp_ht_siso; 850 else if (is_ht_mimo2(rate)) 851 ucode_rate |= iwl_rates[index].plcp_ht_mimo2; 852 else 853 WARN_ON_ONCE(1); 854 } else if (is_vht(rate)) { 855 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) { 856 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index); 857 index = IWL_LAST_VHT_RATE; 858 } 859 ucode_rate |= RATE_MCS_VHT_MSK; 860 if (is_vht_siso(rate)) 861 ucode_rate |= iwl_rates[index].plcp_vht_siso; 862 else if (is_vht_mimo2(rate)) 863 ucode_rate |= iwl_rates[index].plcp_vht_mimo2; 864 else 865 WARN_ON_ONCE(1); 866 867 } else { 868 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type); 869 } 870 871 if (is_siso(rate) && rate->stbc) { 872 /* To enable STBC we need to set both a flag and ANT_AB */ 873 ucode_rate |= RATE_MCS_ANT_AB_MSK; 874 ucode_rate |= RATE_MCS_STBC_MSK; 875 } 876 877 ucode_rate |= rate->bw; 878 if (rate->sgi) 879 ucode_rate |= RATE_MCS_SGI_MSK; 880 if (rate->ldpc) 881 ucode_rate |= RATE_MCS_LDPC_MSK; 882 883 return ucode_rate; 884 } 885 886 /* Convert a ucode rate into an rs_rate object */ 887 static int rs_rate_from_ucode_rate(const u32 ucode_rate, 888 enum nl80211_band band, 889 struct rs_rate *rate) 890 { 891 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK; 892 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate); 893 u8 nss; 894 895 memset(rate, 0, sizeof(*rate)); 896 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate); 897 898 if (rate->index == IWL_RATE_INVALID) 899 return -EINVAL; 900 901 rate->ant = (ant_msk >> RATE_MCS_ANT_POS); 902 903 /* Legacy */ 904 if (!(ucode_rate & RATE_MCS_HT_MSK) && 905 !(ucode_rate & RATE_MCS_VHT_MSK)) { 906 if (num_of_ant == 1) { 907 if (band == NL80211_BAND_5GHZ) 908 rate->type = LQ_LEGACY_A; 909 else 910 rate->type = LQ_LEGACY_G; 911 } 912 913 return 0; 914 } 915 916 /* HT or VHT */ 917 if (ucode_rate & RATE_MCS_SGI_MSK) 918 rate->sgi = true; 919 if (ucode_rate & RATE_MCS_LDPC_MSK) 920 rate->ldpc = true; 921 if (ucode_rate & RATE_MCS_STBC_MSK) 922 rate->stbc = true; 923 if (ucode_rate & RATE_MCS_BF_MSK) 924 rate->bfer = true; 925 926 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK; 927 928 if (ucode_rate & RATE_MCS_HT_MSK) { 929 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >> 930 RATE_HT_MCS_NSS_POS) + 1; 931 932 if (nss == 1) { 933 rate->type = LQ_HT_SISO; 934 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 935 "stbc %d bfer %d", 936 rate->stbc, rate->bfer); 937 } else if (nss == 2) { 938 rate->type = LQ_HT_MIMO2; 939 WARN_ON_ONCE(num_of_ant != 2); 940 } else { 941 WARN_ON_ONCE(1); 942 } 943 } else if (ucode_rate & RATE_MCS_VHT_MSK) { 944 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >> 945 RATE_VHT_MCS_NSS_POS) + 1; 946 947 if (nss == 1) { 948 rate->type = LQ_VHT_SISO; 949 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 950 "stbc %d bfer %d", 951 rate->stbc, rate->bfer); 952 } else if (nss == 2) { 953 rate->type = LQ_VHT_MIMO2; 954 WARN_ON_ONCE(num_of_ant != 2); 955 } else { 956 WARN_ON_ONCE(1); 957 } 958 } 959 960 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 && 961 !is_vht(rate)); 962 963 return 0; 964 } 965 966 /* switch to another antenna/antennas and return 1 */ 967 /* if no other valid antenna found, return 0 */ 968 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate) 969 { 970 u8 new_ant_type; 971 972 if (!rate->ant || WARN_ON_ONCE(rate->ant & ANT_C)) 973 return 0; 974 975 if (!rs_is_valid_ant(valid_ant, rate->ant)) 976 return 0; 977 978 new_ant_type = ant_toggle_lookup[rate->ant]; 979 980 while ((new_ant_type != rate->ant) && 981 !rs_is_valid_ant(valid_ant, new_ant_type)) 982 new_ant_type = ant_toggle_lookup[new_ant_type]; 983 984 if (new_ant_type == rate->ant) 985 return 0; 986 987 rate->ant = new_ant_type; 988 989 return 1; 990 } 991 992 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta, 993 struct rs_rate *rate) 994 { 995 if (is_legacy(rate)) 996 return lq_sta->active_legacy_rate; 997 else if (is_siso(rate)) 998 return lq_sta->active_siso_rate; 999 else if (is_mimo2(rate)) 1000 return lq_sta->active_mimo2_rate; 1001 1002 WARN_ON_ONCE(1); 1003 return 0; 1004 } 1005 1006 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask, 1007 int rate_type) 1008 { 1009 u8 high = IWL_RATE_INVALID; 1010 u8 low = IWL_RATE_INVALID; 1011 1012 /* 802.11A or ht walks to the next literal adjacent rate in 1013 * the rate table */ 1014 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) { 1015 int i; 1016 u32 mask; 1017 1018 /* Find the previous rate that is in the rate mask */ 1019 i = index - 1; 1020 if (i >= 0) 1021 mask = BIT(i); 1022 for (; i >= 0; i--, mask >>= 1) { 1023 if (rate_mask & mask) { 1024 low = i; 1025 break; 1026 } 1027 } 1028 1029 /* Find the next rate that is in the rate mask */ 1030 i = index + 1; 1031 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) { 1032 if (rate_mask & mask) { 1033 high = i; 1034 break; 1035 } 1036 } 1037 1038 return (high << 8) | low; 1039 } 1040 1041 low = index; 1042 while (low != IWL_RATE_INVALID) { 1043 low = iwl_rates[low].prev_rs; 1044 if (low == IWL_RATE_INVALID) 1045 break; 1046 if (rate_mask & (1 << low)) 1047 break; 1048 } 1049 1050 high = index; 1051 while (high != IWL_RATE_INVALID) { 1052 high = iwl_rates[high].next_rs; 1053 if (high == IWL_RATE_INVALID) 1054 break; 1055 if (rate_mask & (1 << high)) 1056 break; 1057 } 1058 1059 return (high << 8) | low; 1060 } 1061 1062 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta, 1063 struct rs_rate *rate) 1064 { 1065 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate); 1066 } 1067 1068 /* Get the next supported lower rate in the current column. 1069 * Return true if bottom rate in the current column was reached 1070 */ 1071 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta, 1072 struct rs_rate *rate) 1073 { 1074 u8 low; 1075 u16 high_low; 1076 u16 rate_mask; 1077 struct iwl_mvm *mvm = lq_sta->pers.drv; 1078 1079 rate_mask = rs_get_supported_rates(lq_sta, rate); 1080 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask, 1081 rate->type); 1082 low = high_low & 0xff; 1083 1084 /* Bottom rate of column reached */ 1085 if (low == IWL_RATE_INVALID) 1086 return true; 1087 1088 rate->index = low; 1089 return false; 1090 } 1091 1092 /* Get the next rate to use following a column downgrade */ 1093 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta, 1094 struct rs_rate *rate) 1095 { 1096 struct iwl_mvm *mvm = lq_sta->pers.drv; 1097 1098 if (is_legacy(rate)) { 1099 /* No column to downgrade from Legacy */ 1100 return; 1101 } else if (is_siso(rate)) { 1102 /* Downgrade to Legacy if we were in SISO */ 1103 if (lq_sta->band == NL80211_BAND_5GHZ) 1104 rate->type = LQ_LEGACY_A; 1105 else 1106 rate->type = LQ_LEGACY_G; 1107 1108 rate->bw = RATE_MCS_CHAN_WIDTH_20; 1109 1110 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX || 1111 rate->index > IWL_RATE_MCS_9_INDEX); 1112 1113 rate->index = rs_ht_to_legacy[rate->index]; 1114 rate->ldpc = false; 1115 } else { 1116 /* Downgrade to SISO with same MCS if in MIMO */ 1117 rate->type = is_vht_mimo2(rate) ? 1118 LQ_VHT_SISO : LQ_HT_SISO; 1119 } 1120 1121 if (num_of_ant(rate->ant) > 1) 1122 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm)); 1123 1124 /* Relevant in both switching to SISO or Legacy */ 1125 rate->sgi = false; 1126 1127 if (!rs_rate_supported(lq_sta, rate)) 1128 rs_get_lower_rate_in_column(lq_sta, rate); 1129 } 1130 1131 /* Check if both rates share the same column */ 1132 static inline bool rs_rate_column_match(struct rs_rate *a, 1133 struct rs_rate *b) 1134 { 1135 bool ant_match; 1136 1137 if (a->stbc || a->bfer) 1138 ant_match = (b->ant == ANT_A || b->ant == ANT_B); 1139 else 1140 ant_match = (a->ant == b->ant); 1141 1142 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) 1143 && ant_match; 1144 } 1145 1146 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate) 1147 { 1148 if (is_legacy(rate)) { 1149 if (rate->ant == ANT_A) 1150 return RS_COLUMN_LEGACY_ANT_A; 1151 1152 if (rate->ant == ANT_B) 1153 return RS_COLUMN_LEGACY_ANT_B; 1154 1155 goto err; 1156 } 1157 1158 if (is_siso(rate)) { 1159 if (rate->ant == ANT_A || rate->stbc || rate->bfer) 1160 return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI : 1161 RS_COLUMN_SISO_ANT_A; 1162 1163 if (rate->ant == ANT_B) 1164 return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI : 1165 RS_COLUMN_SISO_ANT_B; 1166 1167 goto err; 1168 } 1169 1170 if (is_mimo(rate)) 1171 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2; 1172 1173 err: 1174 return RS_COLUMN_INVALID; 1175 } 1176 1177 static u8 rs_get_tid(struct ieee80211_hdr *hdr) 1178 { 1179 u8 tid = IWL_MAX_TID_COUNT; 1180 1181 if (ieee80211_is_data_qos(hdr->frame_control)) { 1182 u8 *qc = ieee80211_get_qos_ctl(hdr); 1183 tid = qc[0] & 0xf; 1184 } 1185 1186 if (unlikely(tid > IWL_MAX_TID_COUNT)) 1187 tid = IWL_MAX_TID_COUNT; 1188 1189 return tid; 1190 } 1191 1192 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1193 int tid, struct ieee80211_tx_info *info, bool ndp) 1194 { 1195 int legacy_success; 1196 int retries; 1197 int i; 1198 struct iwl_lq_cmd *table; 1199 u32 lq_hwrate; 1200 struct rs_rate lq_rate, tx_resp_rate; 1201 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl; 1202 u32 tlc_info = (uintptr_t)info->status.status_driver_data[0]; 1203 u8 reduced_txp = tlc_info & RS_DRV_DATA_TXP_MSK; 1204 u8 lq_color = RS_DRV_DATA_LQ_COLOR_GET(tlc_info); 1205 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1]; 1206 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 1207 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 1208 1209 /* Treat uninitialized rate scaling data same as non-existing. */ 1210 if (!lq_sta) { 1211 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n"); 1212 return; 1213 } else if (!lq_sta->pers.drv) { 1214 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n"); 1215 return; 1216 } 1217 1218 /* This packet was aggregated but doesn't carry status info */ 1219 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 1220 !(info->flags & IEEE80211_TX_STAT_AMPDU)) 1221 return; 1222 1223 rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate); 1224 1225 #ifdef CONFIG_MAC80211_DEBUGFS 1226 /* Disable last tx check if we are debugging with fixed rate but 1227 * update tx stats */ 1228 if (lq_sta->pers.dbg_fixed_rate) { 1229 int index = tx_resp_rate.index; 1230 enum rs_column column; 1231 int attempts, success; 1232 1233 column = rs_get_column_from_rate(&tx_resp_rate); 1234 if (WARN_ONCE(column == RS_COLUMN_INVALID, 1235 "Can't map rate 0x%x to column", 1236 tx_resp_hwrate)) 1237 return; 1238 1239 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 1240 attempts = info->status.ampdu_len; 1241 success = info->status.ampdu_ack_len; 1242 } else { 1243 attempts = info->status.rates[0].count; 1244 success = !!(info->flags & IEEE80211_TX_STAT_ACK); 1245 } 1246 1247 lq_sta->pers.tx_stats[column][index].total += attempts; 1248 lq_sta->pers.tx_stats[column][index].success += success; 1249 1250 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n", 1251 tx_resp_hwrate, success, attempts); 1252 return; 1253 } 1254 #endif 1255 1256 if (time_after(jiffies, 1257 (unsigned long)(lq_sta->last_tx + 1258 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) { 1259 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n"); 1260 iwl_mvm_rs_rate_init(mvm, sta, info->band, false); 1261 return; 1262 } 1263 lq_sta->last_tx = jiffies; 1264 1265 /* Ignore this Tx frame response if its initial rate doesn't match 1266 * that of latest Link Quality command. There may be stragglers 1267 * from a previous Link Quality command, but we're no longer interested 1268 * in those; they're either from the "active" mode while we're trying 1269 * to check "search" mode, or a prior "search" mode after we've moved 1270 * to a new "search" mode (which might become the new "active" mode). 1271 */ 1272 table = &lq_sta->lq; 1273 lq_hwrate = le32_to_cpu(table->rs_table[0]); 1274 rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate); 1275 1276 /* Here we actually compare this rate to the latest LQ command */ 1277 if (lq_color != LQ_FLAG_COLOR_GET(table->flags)) { 1278 IWL_DEBUG_RATE(mvm, 1279 "tx resp color 0x%x does not match 0x%x\n", 1280 lq_color, LQ_FLAG_COLOR_GET(table->flags)); 1281 1282 /* 1283 * Since rates mis-match, the last LQ command may have failed. 1284 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with 1285 * ... driver. 1286 */ 1287 lq_sta->missed_rate_counter++; 1288 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) { 1289 lq_sta->missed_rate_counter = 0; 1290 IWL_DEBUG_RATE(mvm, 1291 "Too many rates mismatch. Send sync LQ. rs_state %d\n", 1292 lq_sta->rs_state); 1293 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false); 1294 } 1295 /* Regardless, ignore this status info for outdated rate */ 1296 return; 1297 } else 1298 /* Rate did match, so reset the missed_rate_counter */ 1299 lq_sta->missed_rate_counter = 0; 1300 1301 if (!lq_sta->search_better_tbl) { 1302 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1303 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1304 } else { 1305 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1306 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1307 } 1308 1309 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) { 1310 IWL_DEBUG_RATE(mvm, 1311 "Neither active nor search matches tx rate\n"); 1312 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1313 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE"); 1314 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1315 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH"); 1316 rs_dump_rate(mvm, &lq_rate, "ACTUAL"); 1317 1318 /* 1319 * no matching table found, let's by-pass the data collection 1320 * and continue to perform rate scale to find the rate table 1321 */ 1322 rs_stay_in_table(lq_sta, true); 1323 goto done; 1324 } 1325 1326 /* 1327 * Updating the frame history depends on whether packets were 1328 * aggregated. 1329 * 1330 * For aggregation, all packets were transmitted at the same rate, the 1331 * first index into rate scale table. 1332 */ 1333 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 1334 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, tx_resp_rate.index, 1335 info->status.ampdu_len, 1336 info->status.ampdu_ack_len, 1337 reduced_txp); 1338 1339 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat 1340 * it as a single frame loss as we don't want the success ratio 1341 * to dip too quickly because a BA wasn't received. 1342 * For TPC, there's no need for this optimisation since we want 1343 * to recover very quickly from a bad power reduction and, 1344 * therefore we'd like the success ratio to get an immediate hit 1345 * when failing to get a BA, so we'd switch back to a lower or 1346 * zero power reduction. When FW transmits agg with a rate 1347 * different from the initial rate, it will not use reduced txp 1348 * and will send BA notification twice (one empty with reduced 1349 * txp equal to the value from LQ and one with reduced txp 0). 1350 * We need to update counters for each txp level accordingly. 1351 */ 1352 if (info->status.ampdu_ack_len == 0) 1353 info->status.ampdu_len = 1; 1354 1355 rs_collect_tlc_data(mvm, mvmsta, tid, curr_tbl, tx_resp_rate.index, 1356 info->status.ampdu_len, 1357 info->status.ampdu_ack_len); 1358 1359 /* Update success/fail counts if not searching for new mode */ 1360 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1361 lq_sta->total_success += info->status.ampdu_ack_len; 1362 lq_sta->total_failed += (info->status.ampdu_len - 1363 info->status.ampdu_ack_len); 1364 } 1365 } else { 1366 /* For legacy, update frame history with for each Tx retry. */ 1367 retries = info->status.rates[0].count - 1; 1368 /* HW doesn't send more than 15 retries */ 1369 retries = min(retries, 15); 1370 1371 /* The last transmission may have been successful */ 1372 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK); 1373 /* Collect data for each rate used during failed TX attempts */ 1374 for (i = 0; i <= retries; ++i) { 1375 lq_hwrate = le32_to_cpu(table->rs_table[i]); 1376 rs_rate_from_ucode_rate(lq_hwrate, info->band, 1377 &lq_rate); 1378 /* 1379 * Only collect stats if retried rate is in the same RS 1380 * table as active/search. 1381 */ 1382 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate)) 1383 tmp_tbl = curr_tbl; 1384 else if (rs_rate_column_match(&lq_rate, 1385 &other_tbl->rate)) 1386 tmp_tbl = other_tbl; 1387 else 1388 continue; 1389 1390 rs_collect_tpc_data(mvm, lq_sta, tmp_tbl, 1391 tx_resp_rate.index, 1, 1392 i < retries ? 0 : legacy_success, 1393 reduced_txp); 1394 rs_collect_tlc_data(mvm, mvmsta, tid, tmp_tbl, 1395 tx_resp_rate.index, 1, 1396 i < retries ? 0 : legacy_success); 1397 } 1398 1399 /* Update success/fail counts if not searching for new mode */ 1400 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1401 lq_sta->total_success += legacy_success; 1402 lq_sta->total_failed += retries + (1 - legacy_success); 1403 } 1404 } 1405 /* The last TX rate is cached in lq_sta; it's set in if/else above */ 1406 lq_sta->last_rate_n_flags = lq_hwrate; 1407 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp); 1408 done: 1409 /* See if there's a better rate or modulation mode to try. */ 1410 if (sta->supp_rates[info->band]) 1411 rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp); 1412 } 1413 1414 /* 1415 * mac80211 sends us Tx status 1416 */ 1417 static void rs_drv_mac80211_tx_status(void *mvm_r, 1418 struct ieee80211_supported_band *sband, 1419 struct ieee80211_sta *sta, void *priv_sta, 1420 struct sk_buff *skb) 1421 { 1422 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1423 struct iwl_op_mode *op_mode = mvm_r; 1424 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 1425 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1426 1427 if (!iwl_mvm_sta_from_mac80211(sta)->vif) 1428 return; 1429 1430 if (!ieee80211_is_data(hdr->frame_control) || 1431 info->flags & IEEE80211_TX_CTL_NO_ACK) 1432 return; 1433 1434 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info, 1435 ieee80211_is_qos_nullfunc(hdr->frame_control)); 1436 } 1437 1438 /* 1439 * Begin a period of staying with a selected modulation mode. 1440 * Set "stay_in_tbl" flag to prevent any mode switches. 1441 * Set frame tx success limits according to legacy vs. high-throughput, 1442 * and reset overall (spanning all rates) tx success history statistics. 1443 * These control how long we stay using same modulation mode before 1444 * searching for a new mode. 1445 */ 1446 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy, 1447 struct iwl_lq_sta *lq_sta) 1448 { 1449 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n"); 1450 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN; 1451 if (is_legacy) { 1452 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT; 1453 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT; 1454 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT; 1455 } else { 1456 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT; 1457 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT; 1458 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT; 1459 } 1460 lq_sta->table_count = 0; 1461 lq_sta->total_failed = 0; 1462 lq_sta->total_success = 0; 1463 lq_sta->flush_timer = jiffies; 1464 lq_sta->visited_columns = 0; 1465 } 1466 1467 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask) 1468 { 1469 if (rate_mask) 1470 return find_last_bit(&rate_mask, BITS_PER_LONG); 1471 return IWL_RATE_INVALID; 1472 } 1473 1474 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta, 1475 const struct rs_tx_column *column) 1476 { 1477 switch (column->mode) { 1478 case RS_LEGACY: 1479 return lq_sta->max_legacy_rate_idx; 1480 case RS_SISO: 1481 return lq_sta->max_siso_rate_idx; 1482 case RS_MIMO2: 1483 return lq_sta->max_mimo2_rate_idx; 1484 default: 1485 WARN_ON_ONCE(1); 1486 } 1487 1488 return lq_sta->max_legacy_rate_idx; 1489 } 1490 1491 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1492 const struct rs_tx_column *column, 1493 u32 bw) 1494 { 1495 /* Used to choose among HT tables */ 1496 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT]; 1497 1498 if (WARN_ON_ONCE(column->mode != RS_LEGACY && 1499 column->mode != RS_SISO && 1500 column->mode != RS_MIMO2)) 1501 return expected_tpt_legacy; 1502 1503 /* Legacy rates have only one table */ 1504 if (column->mode == RS_LEGACY) 1505 return expected_tpt_legacy; 1506 1507 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1508 /* Choose among many HT tables depending on number of streams 1509 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation 1510 * status */ 1511 if (column->mode == RS_SISO) { 1512 switch (bw) { 1513 case RATE_MCS_CHAN_WIDTH_20: 1514 ht_tbl_pointer = expected_tpt_siso_20MHz; 1515 break; 1516 case RATE_MCS_CHAN_WIDTH_40: 1517 ht_tbl_pointer = expected_tpt_siso_40MHz; 1518 break; 1519 case RATE_MCS_CHAN_WIDTH_80: 1520 ht_tbl_pointer = expected_tpt_siso_80MHz; 1521 break; 1522 case RATE_MCS_CHAN_WIDTH_160: 1523 ht_tbl_pointer = expected_tpt_siso_160MHz; 1524 break; 1525 default: 1526 WARN_ON_ONCE(1); 1527 } 1528 } else if (column->mode == RS_MIMO2) { 1529 switch (bw) { 1530 case RATE_MCS_CHAN_WIDTH_20: 1531 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1532 break; 1533 case RATE_MCS_CHAN_WIDTH_40: 1534 ht_tbl_pointer = expected_tpt_mimo2_40MHz; 1535 break; 1536 case RATE_MCS_CHAN_WIDTH_80: 1537 ht_tbl_pointer = expected_tpt_mimo2_80MHz; 1538 break; 1539 case RATE_MCS_CHAN_WIDTH_160: 1540 ht_tbl_pointer = expected_tpt_mimo2_160MHz; 1541 break; 1542 default: 1543 WARN_ON_ONCE(1); 1544 } 1545 } else { 1546 WARN_ON_ONCE(1); 1547 } 1548 1549 if (!column->sgi && !lq_sta->is_agg) /* Normal */ 1550 return ht_tbl_pointer[0]; 1551 else if (column->sgi && !lq_sta->is_agg) /* SGI */ 1552 return ht_tbl_pointer[1]; 1553 else if (!column->sgi && lq_sta->is_agg) /* AGG */ 1554 return ht_tbl_pointer[2]; 1555 else /* AGG+SGI */ 1556 return ht_tbl_pointer[3]; 1557 } 1558 1559 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1560 struct iwl_scale_tbl_info *tbl) 1561 { 1562 struct rs_rate *rate = &tbl->rate; 1563 const struct rs_tx_column *column = &rs_tx_columns[tbl->column]; 1564 1565 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw); 1566 } 1567 1568 static s32 rs_get_best_rate(struct iwl_mvm *mvm, 1569 struct iwl_lq_sta *lq_sta, 1570 struct iwl_scale_tbl_info *tbl, /* "search" */ 1571 unsigned long rate_mask, s8 index) 1572 { 1573 struct iwl_scale_tbl_info *active_tbl = 1574 &(lq_sta->lq_info[lq_sta->active_tbl]); 1575 s32 success_ratio = active_tbl->win[index].success_ratio; 1576 u16 expected_current_tpt = active_tbl->expected_tpt[index]; 1577 const u16 *tpt_tbl = tbl->expected_tpt; 1578 u16 high_low; 1579 u32 target_tpt; 1580 int rate_idx; 1581 1582 if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { 1583 target_tpt = 100 * expected_current_tpt; 1584 IWL_DEBUG_RATE(mvm, 1585 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n", 1586 success_ratio, target_tpt); 1587 } else { 1588 target_tpt = lq_sta->last_tpt; 1589 IWL_DEBUG_RATE(mvm, 1590 "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n", 1591 success_ratio, target_tpt); 1592 } 1593 1594 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG); 1595 1596 while (rate_idx != IWL_RATE_INVALID) { 1597 if (target_tpt < (100 * tpt_tbl[rate_idx])) 1598 break; 1599 1600 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask, 1601 tbl->rate.type); 1602 1603 rate_idx = (high_low >> 8) & 0xff; 1604 } 1605 1606 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n", 1607 rate_idx, target_tpt, 1608 rate_idx != IWL_RATE_INVALID ? 1609 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE); 1610 1611 return rate_idx; 1612 } 1613 1614 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta) 1615 { 1616 switch (sta->bandwidth) { 1617 case IEEE80211_STA_RX_BW_160: 1618 return RATE_MCS_CHAN_WIDTH_160; 1619 case IEEE80211_STA_RX_BW_80: 1620 return RATE_MCS_CHAN_WIDTH_80; 1621 case IEEE80211_STA_RX_BW_40: 1622 return RATE_MCS_CHAN_WIDTH_40; 1623 case IEEE80211_STA_RX_BW_20: 1624 default: 1625 return RATE_MCS_CHAN_WIDTH_20; 1626 } 1627 } 1628 1629 /* 1630 * Check whether we should continue using same modulation mode, or 1631 * begin search for a new mode, based on: 1632 * 1) # tx successes or failures while using this mode 1633 * 2) # times calling this function 1634 * 3) elapsed time in this mode (not used, for now) 1635 */ 1636 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search) 1637 { 1638 struct iwl_scale_tbl_info *tbl; 1639 int active_tbl; 1640 int flush_interval_passed = 0; 1641 struct iwl_mvm *mvm; 1642 1643 mvm = lq_sta->pers.drv; 1644 active_tbl = lq_sta->active_tbl; 1645 1646 tbl = &(lq_sta->lq_info[active_tbl]); 1647 1648 /* If we've been disallowing search, see if we should now allow it */ 1649 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1650 /* Elapsed time using current modulation mode */ 1651 if (lq_sta->flush_timer) 1652 flush_interval_passed = 1653 time_after(jiffies, 1654 (unsigned long)(lq_sta->flush_timer + 1655 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ))); 1656 1657 /* 1658 * Check if we should allow search for new modulation mode. 1659 * If many frames have failed or succeeded, or we've used 1660 * this same modulation for a long time, allow search, and 1661 * reset history stats that keep track of whether we should 1662 * allow a new search. Also (below) reset all bitmaps and 1663 * stats in active history. 1664 */ 1665 if (force_search || 1666 (lq_sta->total_failed > lq_sta->max_failure_limit) || 1667 (lq_sta->total_success > lq_sta->max_success_limit) || 1668 ((!lq_sta->search_better_tbl) && 1669 (lq_sta->flush_timer) && (flush_interval_passed))) { 1670 IWL_DEBUG_RATE(mvm, 1671 "LQ: stay is expired %d %d %d\n", 1672 lq_sta->total_failed, 1673 lq_sta->total_success, 1674 flush_interval_passed); 1675 1676 /* Allow search for new mode */ 1677 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED; 1678 IWL_DEBUG_RATE(mvm, 1679 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n"); 1680 lq_sta->total_failed = 0; 1681 lq_sta->total_success = 0; 1682 lq_sta->flush_timer = 0; 1683 /* mark the current column as visited */ 1684 lq_sta->visited_columns = BIT(tbl->column); 1685 /* 1686 * Else if we've used this modulation mode enough repetitions 1687 * (regardless of elapsed time or success/failure), reset 1688 * history bitmaps and rate-specific stats for all rates in 1689 * active table. 1690 */ 1691 } else { 1692 lq_sta->table_count++; 1693 if (lq_sta->table_count >= 1694 lq_sta->table_count_limit) { 1695 lq_sta->table_count = 0; 1696 1697 IWL_DEBUG_RATE(mvm, 1698 "LQ: stay in table clear win\n"); 1699 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1700 } 1701 } 1702 1703 /* If transitioning to allow "search", reset all history 1704 * bitmaps and stats in active table (this will become the new 1705 * "search" table). */ 1706 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) { 1707 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1708 } 1709 } 1710 } 1711 1712 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1713 struct iwl_scale_tbl_info *tbl, 1714 enum rs_action scale_action) 1715 { 1716 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 1717 1718 if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) || 1719 tbl->rate.index < IWL_RATE_MCS_5_INDEX || 1720 scale_action == RS_ACTION_DOWNSCALE) 1721 mvmsta->tlc_amsdu = false; 1722 else 1723 mvmsta->tlc_amsdu = true; 1724 } 1725 1726 /* 1727 * setup rate table in uCode 1728 */ 1729 static void rs_update_rate_tbl(struct iwl_mvm *mvm, 1730 struct ieee80211_sta *sta, 1731 struct iwl_lq_sta *lq_sta, 1732 struct iwl_scale_tbl_info *tbl) 1733 { 1734 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate); 1735 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false); 1736 } 1737 1738 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm, 1739 struct ieee80211_sta *sta, 1740 struct iwl_lq_sta *lq_sta, 1741 struct iwl_scale_tbl_info *tbl, 1742 enum rs_action scale_action) 1743 { 1744 if (sta->bandwidth != IEEE80211_STA_RX_BW_80) 1745 return false; 1746 1747 if (!is_vht_siso(&tbl->rate)) 1748 return false; 1749 1750 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) && 1751 (tbl->rate.index == IWL_RATE_MCS_0_INDEX) && 1752 (scale_action == RS_ACTION_DOWNSCALE)) { 1753 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20; 1754 tbl->rate.index = IWL_RATE_MCS_4_INDEX; 1755 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n"); 1756 goto tweaked; 1757 } 1758 1759 /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is 1760 * sustainable, i.e. we're past the test window. We can't go back 1761 * if MCS5 is just tested as this will happen always after switching 1762 * to 20Mhz MCS4 because the rate stats are cleared. 1763 */ 1764 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) && 1765 (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) && 1766 (scale_action == RS_ACTION_STAY)) || 1767 ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) && 1768 (scale_action == RS_ACTION_UPSCALE)))) { 1769 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80; 1770 tbl->rate.index = IWL_RATE_MCS_1_INDEX; 1771 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n"); 1772 goto tweaked; 1773 } 1774 1775 return false; 1776 1777 tweaked: 1778 rs_set_expected_tpt_table(lq_sta, tbl); 1779 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1780 return true; 1781 } 1782 1783 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm, 1784 struct iwl_lq_sta *lq_sta, 1785 struct ieee80211_sta *sta, 1786 struct iwl_scale_tbl_info *tbl) 1787 { 1788 int i, j, max_rate; 1789 enum rs_column next_col_id; 1790 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column]; 1791 const struct rs_tx_column *next_col; 1792 allow_column_func_t allow_func; 1793 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm); 1794 const u16 *expected_tpt_tbl; 1795 u16 tpt, max_expected_tpt; 1796 1797 for (i = 0; i < MAX_NEXT_COLUMNS; i++) { 1798 next_col_id = curr_col->next_columns[i]; 1799 1800 if (next_col_id == RS_COLUMN_INVALID) 1801 continue; 1802 1803 if (lq_sta->visited_columns & BIT(next_col_id)) { 1804 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n", 1805 next_col_id); 1806 continue; 1807 } 1808 1809 next_col = &rs_tx_columns[next_col_id]; 1810 1811 if (!rs_is_valid_ant(valid_ants, next_col->ant)) { 1812 IWL_DEBUG_RATE(mvm, 1813 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n", 1814 next_col_id, valid_ants, next_col->ant); 1815 continue; 1816 } 1817 1818 for (j = 0; j < MAX_COLUMN_CHECKS; j++) { 1819 allow_func = next_col->checks[j]; 1820 if (allow_func && !allow_func(mvm, sta, &tbl->rate, 1821 next_col)) 1822 break; 1823 } 1824 1825 if (j != MAX_COLUMN_CHECKS) { 1826 IWL_DEBUG_RATE(mvm, 1827 "Skip column %d: not allowed (check %d failed)\n", 1828 next_col_id, j); 1829 1830 continue; 1831 } 1832 1833 tpt = lq_sta->last_tpt / 100; 1834 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col, 1835 rs_bw_from_sta_bw(sta)); 1836 if (WARN_ON_ONCE(!expected_tpt_tbl)) 1837 continue; 1838 1839 max_rate = rs_get_max_allowed_rate(lq_sta, next_col); 1840 if (max_rate == IWL_RATE_INVALID) { 1841 IWL_DEBUG_RATE(mvm, 1842 "Skip column %d: no rate is allowed in this column\n", 1843 next_col_id); 1844 continue; 1845 } 1846 1847 max_expected_tpt = expected_tpt_tbl[max_rate]; 1848 if (tpt >= max_expected_tpt) { 1849 IWL_DEBUG_RATE(mvm, 1850 "Skip column %d: can't beat current TPT. Max expected %d current %d\n", 1851 next_col_id, max_expected_tpt, tpt); 1852 continue; 1853 } 1854 1855 IWL_DEBUG_RATE(mvm, 1856 "Found potential column %d. Max expected %d current %d\n", 1857 next_col_id, max_expected_tpt, tpt); 1858 break; 1859 } 1860 1861 if (i == MAX_NEXT_COLUMNS) 1862 return RS_COLUMN_INVALID; 1863 1864 return next_col_id; 1865 } 1866 1867 static int rs_switch_to_column(struct iwl_mvm *mvm, 1868 struct iwl_lq_sta *lq_sta, 1869 struct ieee80211_sta *sta, 1870 enum rs_column col_id) 1871 { 1872 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1873 struct iwl_scale_tbl_info *search_tbl = 1874 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 1875 struct rs_rate *rate = &search_tbl->rate; 1876 const struct rs_tx_column *column = &rs_tx_columns[col_id]; 1877 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column]; 1878 unsigned long rate_mask = 0; 1879 u32 rate_idx = 0; 1880 1881 memcpy(search_tbl, tbl, offsetof(struct iwl_scale_tbl_info, win)); 1882 1883 rate->sgi = column->sgi; 1884 rate->ant = column->ant; 1885 1886 if (column->mode == RS_LEGACY) { 1887 if (lq_sta->band == NL80211_BAND_5GHZ) 1888 rate->type = LQ_LEGACY_A; 1889 else 1890 rate->type = LQ_LEGACY_G; 1891 1892 rate->bw = RATE_MCS_CHAN_WIDTH_20; 1893 rate->ldpc = false; 1894 rate_mask = lq_sta->active_legacy_rate; 1895 } else if (column->mode == RS_SISO) { 1896 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; 1897 rate_mask = lq_sta->active_siso_rate; 1898 } else if (column->mode == RS_MIMO2) { 1899 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; 1900 rate_mask = lq_sta->active_mimo2_rate; 1901 } else { 1902 WARN_ONCE(1, "Bad column mode"); 1903 } 1904 1905 if (column->mode != RS_LEGACY) { 1906 rate->bw = rs_bw_from_sta_bw(sta); 1907 rate->ldpc = lq_sta->ldpc; 1908 } 1909 1910 search_tbl->column = col_id; 1911 rs_set_expected_tpt_table(lq_sta, search_tbl); 1912 1913 lq_sta->visited_columns |= BIT(col_id); 1914 1915 /* Get the best matching rate if we're changing modes. e.g. 1916 * SISO->MIMO, LEGACY->SISO, MIMO->SISO 1917 */ 1918 if (curr_column->mode != column->mode) { 1919 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl, 1920 rate_mask, rate->index); 1921 1922 if ((rate_idx == IWL_RATE_INVALID) || 1923 !(BIT(rate_idx) & rate_mask)) { 1924 IWL_DEBUG_RATE(mvm, 1925 "can not switch with index %d" 1926 " rate mask %lx\n", 1927 rate_idx, rate_mask); 1928 1929 goto err; 1930 } 1931 1932 rate->index = rate_idx; 1933 } 1934 1935 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n", 1936 col_id, rate->index); 1937 1938 return 0; 1939 1940 err: 1941 rate->type = LQ_NONE; 1942 return -1; 1943 } 1944 1945 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm, 1946 struct iwl_scale_tbl_info *tbl, 1947 s32 sr, int low, int high, 1948 int current_tpt, 1949 int low_tpt, int high_tpt) 1950 { 1951 enum rs_action action = RS_ACTION_STAY; 1952 1953 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) || 1954 (current_tpt == 0)) { 1955 IWL_DEBUG_RATE(mvm, 1956 "Decrease rate because of low SR\n"); 1957 return RS_ACTION_DOWNSCALE; 1958 } 1959 1960 if ((low_tpt == IWL_INVALID_VALUE) && 1961 (high_tpt == IWL_INVALID_VALUE) && 1962 (high != IWL_RATE_INVALID)) { 1963 IWL_DEBUG_RATE(mvm, 1964 "No data about high/low rates. Increase rate\n"); 1965 return RS_ACTION_UPSCALE; 1966 } 1967 1968 if ((high_tpt == IWL_INVALID_VALUE) && 1969 (high != IWL_RATE_INVALID) && 1970 (low_tpt != IWL_INVALID_VALUE) && 1971 (low_tpt < current_tpt)) { 1972 IWL_DEBUG_RATE(mvm, 1973 "No data about high rate and low rate is worse. Increase rate\n"); 1974 return RS_ACTION_UPSCALE; 1975 } 1976 1977 if ((high_tpt != IWL_INVALID_VALUE) && 1978 (high_tpt > current_tpt)) { 1979 IWL_DEBUG_RATE(mvm, 1980 "Higher rate is better. Increate rate\n"); 1981 return RS_ACTION_UPSCALE; 1982 } 1983 1984 if ((low_tpt != IWL_INVALID_VALUE) && 1985 (high_tpt != IWL_INVALID_VALUE) && 1986 (low_tpt < current_tpt) && 1987 (high_tpt < current_tpt)) { 1988 IWL_DEBUG_RATE(mvm, 1989 "Both high and low are worse. Maintain rate\n"); 1990 return RS_ACTION_STAY; 1991 } 1992 1993 if ((low_tpt != IWL_INVALID_VALUE) && 1994 (low_tpt > current_tpt)) { 1995 IWL_DEBUG_RATE(mvm, 1996 "Lower rate is better\n"); 1997 action = RS_ACTION_DOWNSCALE; 1998 goto out; 1999 } 2000 2001 if ((low_tpt == IWL_INVALID_VALUE) && 2002 (low != IWL_RATE_INVALID)) { 2003 IWL_DEBUG_RATE(mvm, 2004 "No data about lower rate\n"); 2005 action = RS_ACTION_DOWNSCALE; 2006 goto out; 2007 } 2008 2009 IWL_DEBUG_RATE(mvm, "Maintain rate\n"); 2010 2011 out: 2012 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) { 2013 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { 2014 IWL_DEBUG_RATE(mvm, 2015 "SR is above NO DECREASE. Avoid downscale\n"); 2016 action = RS_ACTION_STAY; 2017 } else if (current_tpt > (100 * tbl->expected_tpt[low])) { 2018 IWL_DEBUG_RATE(mvm, 2019 "Current TPT is higher than max expected in low rate. Avoid downscale\n"); 2020 action = RS_ACTION_STAY; 2021 } else { 2022 IWL_DEBUG_RATE(mvm, "Decrease rate\n"); 2023 } 2024 } 2025 2026 return action; 2027 } 2028 2029 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 2030 struct iwl_lq_sta *lq_sta) 2031 { 2032 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which 2033 * supports STBC of at least 1*SS 2034 */ 2035 if (!lq_sta->stbc_capable) 2036 return false; 2037 2038 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 2039 return false; 2040 2041 return true; 2042 } 2043 2044 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index, 2045 int *weaker, int *stronger) 2046 { 2047 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP; 2048 if (*weaker > TPC_MAX_REDUCTION) 2049 *weaker = TPC_INVALID; 2050 2051 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP; 2052 if (*stronger < 0) 2053 *stronger = TPC_INVALID; 2054 } 2055 2056 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif, 2057 struct rs_rate *rate, enum nl80211_band band) 2058 { 2059 int index = rate->index; 2060 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM); 2061 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION && 2062 !vif->bss_conf.ps); 2063 2064 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n", 2065 cam, sta_ps_disabled); 2066 /* 2067 * allow tpc only if power management is enabled, or bt coex 2068 * activity grade allows it and we are on 2.4Ghz. 2069 */ 2070 if ((cam || sta_ps_disabled) && 2071 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band)) 2072 return false; 2073 2074 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type); 2075 if (is_legacy(rate)) 2076 return index == IWL_RATE_54M_INDEX; 2077 if (is_ht(rate)) 2078 return index == IWL_RATE_MCS_7_INDEX; 2079 if (is_vht(rate)) 2080 return index == IWL_RATE_MCS_7_INDEX || 2081 index == IWL_RATE_MCS_8_INDEX || 2082 index == IWL_RATE_MCS_9_INDEX; 2083 2084 WARN_ON_ONCE(1); 2085 return false; 2086 } 2087 2088 enum tpc_action { 2089 TPC_ACTION_STAY, 2090 TPC_ACTION_DECREASE, 2091 TPC_ACTION_INCREASE, 2092 TPC_ACTION_NO_RESTIRCTION, 2093 }; 2094 2095 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm, 2096 s32 sr, int weak, int strong, 2097 int current_tpt, 2098 int weak_tpt, int strong_tpt) 2099 { 2100 /* stay until we have valid tpt */ 2101 if (current_tpt == IWL_INVALID_VALUE) { 2102 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n"); 2103 return TPC_ACTION_STAY; 2104 } 2105 2106 /* Too many failures, increase txp */ 2107 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) || 2108 current_tpt == 0) { 2109 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n"); 2110 return TPC_ACTION_NO_RESTIRCTION; 2111 } 2112 2113 /* try decreasing first if applicable */ 2114 if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) && 2115 weak != TPC_INVALID) { 2116 if (weak_tpt == IWL_INVALID_VALUE && 2117 (strong_tpt == IWL_INVALID_VALUE || 2118 current_tpt >= strong_tpt)) { 2119 IWL_DEBUG_RATE(mvm, 2120 "no weak txp measurement. decrease txp\n"); 2121 return TPC_ACTION_DECREASE; 2122 } 2123 2124 if (weak_tpt > current_tpt) { 2125 IWL_DEBUG_RATE(mvm, 2126 "lower txp has better tpt. decrease txp\n"); 2127 return TPC_ACTION_DECREASE; 2128 } 2129 } 2130 2131 /* next, increase if needed */ 2132 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) && 2133 strong != TPC_INVALID) { 2134 if (weak_tpt == IWL_INVALID_VALUE && 2135 strong_tpt != IWL_INVALID_VALUE && 2136 current_tpt < strong_tpt) { 2137 IWL_DEBUG_RATE(mvm, 2138 "higher txp has better tpt. increase txp\n"); 2139 return TPC_ACTION_INCREASE; 2140 } 2141 2142 if (weak_tpt < current_tpt && 2143 (strong_tpt == IWL_INVALID_VALUE || 2144 strong_tpt > current_tpt)) { 2145 IWL_DEBUG_RATE(mvm, 2146 "lower txp has worse tpt. increase txp\n"); 2147 return TPC_ACTION_INCREASE; 2148 } 2149 } 2150 2151 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n"); 2152 return TPC_ACTION_STAY; 2153 } 2154 2155 static bool rs_tpc_perform(struct iwl_mvm *mvm, 2156 struct ieee80211_sta *sta, 2157 struct iwl_lq_sta *lq_sta, 2158 struct iwl_scale_tbl_info *tbl) 2159 { 2160 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta); 2161 struct ieee80211_vif *vif = mvm_sta->vif; 2162 struct ieee80211_chanctx_conf *chanctx_conf; 2163 enum nl80211_band band; 2164 struct iwl_rate_scale_data *window; 2165 struct rs_rate *rate = &tbl->rate; 2166 enum tpc_action action; 2167 s32 sr; 2168 u8 cur = lq_sta->lq.reduced_tpc; 2169 int current_tpt; 2170 int weak, strong; 2171 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE; 2172 2173 #ifdef CONFIG_MAC80211_DEBUGFS 2174 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) { 2175 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n", 2176 lq_sta->pers.dbg_fixed_txp_reduction); 2177 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction; 2178 return cur != lq_sta->pers.dbg_fixed_txp_reduction; 2179 } 2180 #endif 2181 2182 rcu_read_lock(); 2183 chanctx_conf = rcu_dereference(vif->chanctx_conf); 2184 if (WARN_ON(!chanctx_conf)) 2185 band = NUM_NL80211_BANDS; 2186 else 2187 band = chanctx_conf->def.chan->band; 2188 rcu_read_unlock(); 2189 2190 if (!rs_tpc_allowed(mvm, vif, rate, band)) { 2191 IWL_DEBUG_RATE(mvm, 2192 "tpc is not allowed. remove txp restrictions\n"); 2193 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 2194 return cur != TPC_NO_REDUCTION; 2195 } 2196 2197 rs_get_adjacent_txp(mvm, cur, &weak, &strong); 2198 2199 /* Collect measured throughputs for current and adjacent rates */ 2200 window = tbl->tpc_win; 2201 sr = window[cur].success_ratio; 2202 current_tpt = window[cur].average_tpt; 2203 if (weak != TPC_INVALID) 2204 weak_tpt = window[weak].average_tpt; 2205 if (strong != TPC_INVALID) 2206 strong_tpt = window[strong].average_tpt; 2207 2208 IWL_DEBUG_RATE(mvm, 2209 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n", 2210 cur, current_tpt, sr, weak, strong, 2211 weak_tpt, strong_tpt); 2212 2213 action = rs_get_tpc_action(mvm, sr, weak, strong, 2214 current_tpt, weak_tpt, strong_tpt); 2215 2216 /* override actions if we are on the edge */ 2217 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) { 2218 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n"); 2219 action = TPC_ACTION_STAY; 2220 } else if (strong == TPC_INVALID && 2221 (action == TPC_ACTION_INCREASE || 2222 action == TPC_ACTION_NO_RESTIRCTION)) { 2223 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n"); 2224 action = TPC_ACTION_STAY; 2225 } 2226 2227 switch (action) { 2228 case TPC_ACTION_DECREASE: 2229 lq_sta->lq.reduced_tpc = weak; 2230 return true; 2231 case TPC_ACTION_INCREASE: 2232 lq_sta->lq.reduced_tpc = strong; 2233 return true; 2234 case TPC_ACTION_NO_RESTIRCTION: 2235 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 2236 return true; 2237 case TPC_ACTION_STAY: 2238 /* do nothing */ 2239 break; 2240 } 2241 return false; 2242 } 2243 2244 /* 2245 * Do rate scaling and search for new modulation mode. 2246 */ 2247 static void rs_rate_scale_perform(struct iwl_mvm *mvm, 2248 struct ieee80211_sta *sta, 2249 struct iwl_lq_sta *lq_sta, 2250 int tid, bool ndp) 2251 { 2252 int low = IWL_RATE_INVALID; 2253 int high = IWL_RATE_INVALID; 2254 int index; 2255 struct iwl_rate_scale_data *window = NULL; 2256 int current_tpt = IWL_INVALID_VALUE; 2257 int low_tpt = IWL_INVALID_VALUE; 2258 int high_tpt = IWL_INVALID_VALUE; 2259 u32 fail_count; 2260 enum rs_action scale_action = RS_ACTION_STAY; 2261 u16 rate_mask; 2262 u8 update_lq = 0; 2263 struct iwl_scale_tbl_info *tbl, *tbl1; 2264 u8 active_tbl = 0; 2265 u8 done_search = 0; 2266 u16 high_low; 2267 s32 sr; 2268 u8 prev_agg = lq_sta->is_agg; 2269 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 2270 struct rs_rate *rate; 2271 2272 lq_sta->is_agg = !!mvmsta->agg_tids; 2273 2274 /* 2275 * Select rate-scale / modulation-mode table to work with in 2276 * the rest of this function: "search" if searching for better 2277 * modulation mode, or "active" if doing rate scaling within a mode. 2278 */ 2279 if (!lq_sta->search_better_tbl) 2280 active_tbl = lq_sta->active_tbl; 2281 else 2282 active_tbl = 1 - lq_sta->active_tbl; 2283 2284 tbl = &(lq_sta->lq_info[active_tbl]); 2285 rate = &tbl->rate; 2286 2287 if (prev_agg != lq_sta->is_agg) { 2288 IWL_DEBUG_RATE(mvm, 2289 "Aggregation changed: prev %d current %d. Update expected TPT table\n", 2290 prev_agg, lq_sta->is_agg); 2291 rs_set_expected_tpt_table(lq_sta, tbl); 2292 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2293 } 2294 2295 /* current tx rate */ 2296 index = rate->index; 2297 2298 /* rates available for this association, and for modulation mode */ 2299 rate_mask = rs_get_supported_rates(lq_sta, rate); 2300 2301 if (!(BIT(index) & rate_mask)) { 2302 IWL_ERR(mvm, "Current Rate is not valid\n"); 2303 if (lq_sta->search_better_tbl) { 2304 /* revert to active table if search table is not valid*/ 2305 rate->type = LQ_NONE; 2306 lq_sta->search_better_tbl = 0; 2307 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 2308 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2309 } 2310 return; 2311 } 2312 2313 /* Get expected throughput table and history window for current rate */ 2314 if (!tbl->expected_tpt) { 2315 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n"); 2316 return; 2317 } 2318 2319 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2320 window = &(tbl->win[index]); 2321 2322 /* 2323 * If there is not enough history to calculate actual average 2324 * throughput, keep analyzing results of more tx frames, without 2325 * changing rate or mode (bypass most of the rest of this function). 2326 * Set up new rate table in uCode only if old rate is not supported 2327 * in current association (use new rate found above). 2328 */ 2329 fail_count = window->counter - window->success_counter; 2330 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) && 2331 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) { 2332 IWL_DEBUG_RATE(mvm, 2333 "%s: Test Window: succ %d total %d\n", 2334 rs_pretty_rate(rate), 2335 window->success_counter, window->counter); 2336 2337 /* Can't calculate this yet; not enough history */ 2338 window->average_tpt = IWL_INVALID_VALUE; 2339 2340 /* Should we stay with this modulation mode, 2341 * or search for a new one? */ 2342 rs_stay_in_table(lq_sta, false); 2343 2344 return; 2345 } 2346 2347 /* If we are searching for better modulation mode, check success. */ 2348 if (lq_sta->search_better_tbl) { 2349 /* If good success, continue using the "search" mode; 2350 * no need to send new link quality command, since we're 2351 * continuing to use the setup that we've been trying. */ 2352 if (window->average_tpt > lq_sta->last_tpt) { 2353 IWL_DEBUG_RATE(mvm, 2354 "SWITCHING TO NEW TABLE SR: %d " 2355 "cur-tpt %d old-tpt %d\n", 2356 window->success_ratio, 2357 window->average_tpt, 2358 lq_sta->last_tpt); 2359 2360 /* Swap tables; "search" becomes "active" */ 2361 lq_sta->active_tbl = active_tbl; 2362 current_tpt = window->average_tpt; 2363 /* Else poor success; go back to mode in "active" table */ 2364 } else { 2365 IWL_DEBUG_RATE(mvm, 2366 "GOING BACK TO THE OLD TABLE: SR %d " 2367 "cur-tpt %d old-tpt %d\n", 2368 window->success_ratio, 2369 window->average_tpt, 2370 lq_sta->last_tpt); 2371 2372 /* Nullify "search" table */ 2373 rate->type = LQ_NONE; 2374 2375 /* Revert to "active" table */ 2376 active_tbl = lq_sta->active_tbl; 2377 tbl = &(lq_sta->lq_info[active_tbl]); 2378 2379 /* Revert to "active" rate and throughput info */ 2380 index = tbl->rate.index; 2381 current_tpt = lq_sta->last_tpt; 2382 2383 /* Need to set up a new rate table in uCode */ 2384 update_lq = 1; 2385 } 2386 2387 /* Either way, we've made a decision; modulation mode 2388 * search is done, allow rate adjustment next time. */ 2389 lq_sta->search_better_tbl = 0; 2390 done_search = 1; /* Don't switch modes below! */ 2391 goto lq_update; 2392 } 2393 2394 /* (Else) not in search of better modulation mode, try for better 2395 * starting rate, while staying in this mode. */ 2396 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type); 2397 low = high_low & 0xff; 2398 high = (high_low >> 8) & 0xff; 2399 2400 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2401 2402 sr = window->success_ratio; 2403 2404 /* Collect measured throughputs for current and adjacent rates */ 2405 current_tpt = window->average_tpt; 2406 if (low != IWL_RATE_INVALID) 2407 low_tpt = tbl->win[low].average_tpt; 2408 if (high != IWL_RATE_INVALID) 2409 high_tpt = tbl->win[high].average_tpt; 2410 2411 IWL_DEBUG_RATE(mvm, 2412 "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n", 2413 rs_pretty_rate(rate), current_tpt, sr, 2414 low, high, low_tpt, high_tpt); 2415 2416 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high, 2417 current_tpt, low_tpt, high_tpt); 2418 2419 /* Force a search in case BT doesn't like us being in MIMO */ 2420 if (is_mimo(rate) && 2421 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) { 2422 IWL_DEBUG_RATE(mvm, 2423 "BT Coex forbids MIMO. Search for new config\n"); 2424 rs_stay_in_table(lq_sta, true); 2425 goto lq_update; 2426 } 2427 2428 switch (scale_action) { 2429 case RS_ACTION_DOWNSCALE: 2430 /* Decrease starting rate, update uCode's rate table */ 2431 if (low != IWL_RATE_INVALID) { 2432 update_lq = 1; 2433 index = low; 2434 } else { 2435 IWL_DEBUG_RATE(mvm, 2436 "At the bottom rate. Can't decrease\n"); 2437 } 2438 2439 break; 2440 case RS_ACTION_UPSCALE: 2441 /* Increase starting rate, update uCode's rate table */ 2442 if (high != IWL_RATE_INVALID) { 2443 update_lq = 1; 2444 index = high; 2445 } else { 2446 IWL_DEBUG_RATE(mvm, 2447 "At the top rate. Can't increase\n"); 2448 } 2449 2450 break; 2451 case RS_ACTION_STAY: 2452 /* No change */ 2453 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) 2454 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl); 2455 break; 2456 default: 2457 break; 2458 } 2459 2460 lq_update: 2461 /* Replace uCode's rate table for the destination station. */ 2462 if (update_lq) { 2463 tbl->rate.index = index; 2464 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK) 2465 rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action); 2466 rs_set_amsdu_len(mvm, sta, tbl, scale_action); 2467 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2468 } 2469 2470 rs_stay_in_table(lq_sta, false); 2471 2472 /* 2473 * Search for new modulation mode if we're: 2474 * 1) Not changing rates right now 2475 * 2) Not just finishing up a search 2476 * 3) Allowing a new search 2477 */ 2478 if (!update_lq && !done_search && 2479 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED 2480 && window->counter) { 2481 enum rs_column next_column; 2482 2483 /* Save current throughput to compare with "search" throughput*/ 2484 lq_sta->last_tpt = current_tpt; 2485 2486 IWL_DEBUG_RATE(mvm, 2487 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n", 2488 update_lq, done_search, lq_sta->rs_state, 2489 window->counter); 2490 2491 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl); 2492 if (next_column != RS_COLUMN_INVALID) { 2493 int ret = rs_switch_to_column(mvm, lq_sta, sta, 2494 next_column); 2495 if (!ret) 2496 lq_sta->search_better_tbl = 1; 2497 } else { 2498 IWL_DEBUG_RATE(mvm, 2499 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n"); 2500 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED; 2501 } 2502 2503 /* If new "search" mode was selected, set up in uCode table */ 2504 if (lq_sta->search_better_tbl) { 2505 /* Access the "search" table, clear its history. */ 2506 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 2507 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2508 2509 /* Use new "search" start rate */ 2510 index = tbl->rate.index; 2511 2512 rs_dump_rate(mvm, &tbl->rate, 2513 "Switch to SEARCH TABLE:"); 2514 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2515 } else { 2516 done_search = 1; 2517 } 2518 } 2519 2520 if (!ndp) 2521 rs_tl_turn_on_agg(mvm, mvmsta, tid, lq_sta, sta); 2522 2523 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) { 2524 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]); 2525 rs_set_stay_in_table(mvm, is_legacy(&tbl1->rate), lq_sta); 2526 } 2527 } 2528 2529 struct rs_init_rate_info { 2530 s8 rssi; 2531 u8 rate_idx; 2532 }; 2533 2534 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = { 2535 { -60, IWL_RATE_54M_INDEX }, 2536 { -64, IWL_RATE_48M_INDEX }, 2537 { -68, IWL_RATE_36M_INDEX }, 2538 { -80, IWL_RATE_24M_INDEX }, 2539 { -84, IWL_RATE_18M_INDEX }, 2540 { -85, IWL_RATE_12M_INDEX }, 2541 { -86, IWL_RATE_11M_INDEX }, 2542 { -88, IWL_RATE_5M_INDEX }, 2543 { -90, IWL_RATE_2M_INDEX }, 2544 { S8_MIN, IWL_RATE_1M_INDEX }, 2545 }; 2546 2547 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = { 2548 { -60, IWL_RATE_54M_INDEX }, 2549 { -64, IWL_RATE_48M_INDEX }, 2550 { -72, IWL_RATE_36M_INDEX }, 2551 { -80, IWL_RATE_24M_INDEX }, 2552 { -84, IWL_RATE_18M_INDEX }, 2553 { -85, IWL_RATE_12M_INDEX }, 2554 { -87, IWL_RATE_9M_INDEX }, 2555 { S8_MIN, IWL_RATE_6M_INDEX }, 2556 }; 2557 2558 static const struct rs_init_rate_info rs_optimal_rates_ht[] = { 2559 { -60, IWL_RATE_MCS_7_INDEX }, 2560 { -64, IWL_RATE_MCS_6_INDEX }, 2561 { -68, IWL_RATE_MCS_5_INDEX }, 2562 { -72, IWL_RATE_MCS_4_INDEX }, 2563 { -80, IWL_RATE_MCS_3_INDEX }, 2564 { -84, IWL_RATE_MCS_2_INDEX }, 2565 { -85, IWL_RATE_MCS_1_INDEX }, 2566 { S8_MIN, IWL_RATE_MCS_0_INDEX}, 2567 }; 2568 2569 /* MCS index 9 is not valid for 20MHz VHT channel width, 2570 * but is ok for 40, 80 and 160MHz channels. 2571 */ 2572 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = { 2573 { -60, IWL_RATE_MCS_8_INDEX }, 2574 { -64, IWL_RATE_MCS_7_INDEX }, 2575 { -68, IWL_RATE_MCS_6_INDEX }, 2576 { -72, IWL_RATE_MCS_5_INDEX }, 2577 { -80, IWL_RATE_MCS_4_INDEX }, 2578 { -84, IWL_RATE_MCS_3_INDEX }, 2579 { -85, IWL_RATE_MCS_2_INDEX }, 2580 { -87, IWL_RATE_MCS_1_INDEX }, 2581 { S8_MIN, IWL_RATE_MCS_0_INDEX}, 2582 }; 2583 2584 static const struct rs_init_rate_info rs_optimal_rates_vht[] = { 2585 { -60, IWL_RATE_MCS_9_INDEX }, 2586 { -64, IWL_RATE_MCS_8_INDEX }, 2587 { -68, IWL_RATE_MCS_7_INDEX }, 2588 { -72, IWL_RATE_MCS_6_INDEX }, 2589 { -80, IWL_RATE_MCS_5_INDEX }, 2590 { -84, IWL_RATE_MCS_4_INDEX }, 2591 { -85, IWL_RATE_MCS_3_INDEX }, 2592 { -87, IWL_RATE_MCS_2_INDEX }, 2593 { -88, IWL_RATE_MCS_1_INDEX }, 2594 { S8_MIN, IWL_RATE_MCS_0_INDEX }, 2595 }; 2596 2597 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */ 2598 2599 /* Init the optimal rate based on STA caps 2600 * This combined with rssi is used to report the last tx rate 2601 * to userspace when we haven't transmitted enough frames. 2602 */ 2603 static void rs_init_optimal_rate(struct iwl_mvm *mvm, 2604 struct ieee80211_sta *sta, 2605 struct iwl_lq_sta *lq_sta) 2606 { 2607 struct rs_rate *rate = &lq_sta->optimal_rate; 2608 2609 if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID) 2610 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; 2611 else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID) 2612 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; 2613 else if (lq_sta->band == NL80211_BAND_5GHZ) 2614 rate->type = LQ_LEGACY_A; 2615 else 2616 rate->type = LQ_LEGACY_G; 2617 2618 rate->bw = rs_bw_from_sta_bw(sta); 2619 rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL); 2620 2621 /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */ 2622 2623 if (is_mimo(rate)) { 2624 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate; 2625 } else if (is_siso(rate)) { 2626 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate; 2627 } else { 2628 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate; 2629 2630 if (lq_sta->band == NL80211_BAND_5GHZ) { 2631 lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy; 2632 lq_sta->optimal_nentries = 2633 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy); 2634 } else { 2635 lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy; 2636 lq_sta->optimal_nentries = 2637 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy); 2638 } 2639 } 2640 2641 if (is_vht(rate)) { 2642 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) { 2643 lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz; 2644 lq_sta->optimal_nentries = 2645 ARRAY_SIZE(rs_optimal_rates_vht_20mhz); 2646 } else { 2647 lq_sta->optimal_rates = rs_optimal_rates_vht; 2648 lq_sta->optimal_nentries = 2649 ARRAY_SIZE(rs_optimal_rates_vht); 2650 } 2651 } else if (is_ht(rate)) { 2652 lq_sta->optimal_rates = rs_optimal_rates_ht; 2653 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht); 2654 } 2655 } 2656 2657 /* Compute the optimal rate index based on RSSI */ 2658 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm, 2659 struct iwl_lq_sta *lq_sta) 2660 { 2661 struct rs_rate *rate = &lq_sta->optimal_rate; 2662 int i; 2663 2664 rate->index = find_first_bit(&lq_sta->optimal_rate_mask, 2665 BITS_PER_LONG); 2666 2667 for (i = 0; i < lq_sta->optimal_nentries; i++) { 2668 int rate_idx = lq_sta->optimal_rates[i].rate_idx; 2669 2670 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) && 2671 (BIT(rate_idx) & lq_sta->optimal_rate_mask)) { 2672 rate->index = rate_idx; 2673 break; 2674 } 2675 } 2676 2677 return rate; 2678 } 2679 2680 /* Choose an initial legacy rate and antenna to use based on the RSSI 2681 * of last Rx 2682 */ 2683 static void rs_get_initial_rate(struct iwl_mvm *mvm, 2684 struct ieee80211_sta *sta, 2685 struct iwl_lq_sta *lq_sta, 2686 enum nl80211_band band, 2687 struct rs_rate *rate) 2688 { 2689 int i, nentries; 2690 unsigned long active_rate; 2691 s8 best_rssi = S8_MIN; 2692 u8 best_ant = ANT_NONE; 2693 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 2694 const struct rs_init_rate_info *initial_rates; 2695 2696 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { 2697 if (!(lq_sta->pers.chains & BIT(i))) 2698 continue; 2699 2700 if (lq_sta->pers.chain_signal[i] > best_rssi) { 2701 best_rssi = lq_sta->pers.chain_signal[i]; 2702 best_ant = BIT(i); 2703 } 2704 } 2705 2706 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n", 2707 rs_pretty_ant(best_ant), best_rssi); 2708 2709 if (best_ant != ANT_A && best_ant != ANT_B) 2710 rate->ant = first_antenna(valid_tx_ant); 2711 else 2712 rate->ant = best_ant; 2713 2714 rate->sgi = false; 2715 rate->ldpc = false; 2716 rate->bw = RATE_MCS_CHAN_WIDTH_20; 2717 2718 rate->index = find_first_bit(&lq_sta->active_legacy_rate, 2719 BITS_PER_LONG); 2720 2721 if (band == NL80211_BAND_5GHZ) { 2722 rate->type = LQ_LEGACY_A; 2723 initial_rates = rs_optimal_rates_5ghz_legacy; 2724 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy); 2725 } else { 2726 rate->type = LQ_LEGACY_G; 2727 initial_rates = rs_optimal_rates_24ghz_legacy; 2728 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy); 2729 } 2730 2731 if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE) 2732 goto out; 2733 2734 /* Start from a higher rate if the corresponding debug capability 2735 * is enabled. The rate is chosen according to AP capabilities. 2736 * In case of VHT/HT when the rssi is low fallback to the case of 2737 * legacy rates. 2738 */ 2739 if (sta->vht_cap.vht_supported && 2740 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { 2741 switch (sta->bandwidth) { 2742 case IEEE80211_STA_RX_BW_160: 2743 case IEEE80211_STA_RX_BW_80: 2744 case IEEE80211_STA_RX_BW_40: 2745 initial_rates = rs_optimal_rates_vht; 2746 nentries = ARRAY_SIZE(rs_optimal_rates_vht); 2747 break; 2748 case IEEE80211_STA_RX_BW_20: 2749 initial_rates = rs_optimal_rates_vht_20mhz; 2750 nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz); 2751 break; 2752 default: 2753 IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth); 2754 goto out; 2755 } 2756 2757 active_rate = lq_sta->active_siso_rate; 2758 rate->type = LQ_VHT_SISO; 2759 rate->bw = rs_bw_from_sta_bw(sta); 2760 } else if (sta->ht_cap.ht_supported && 2761 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { 2762 initial_rates = rs_optimal_rates_ht; 2763 nentries = ARRAY_SIZE(rs_optimal_rates_ht); 2764 active_rate = lq_sta->active_siso_rate; 2765 rate->type = LQ_HT_SISO; 2766 } else { 2767 active_rate = lq_sta->active_legacy_rate; 2768 } 2769 2770 for (i = 0; i < nentries; i++) { 2771 int rate_idx = initial_rates[i].rate_idx; 2772 2773 if ((best_rssi >= initial_rates[i].rssi) && 2774 (BIT(rate_idx) & active_rate)) { 2775 rate->index = rate_idx; 2776 break; 2777 } 2778 } 2779 2780 out: 2781 rs_dump_rate(mvm, rate, "INITIAL"); 2782 } 2783 2784 /* Save info about RSSI of last Rx */ 2785 void rs_update_last_rssi(struct iwl_mvm *mvm, 2786 struct iwl_mvm_sta *mvmsta, 2787 struct ieee80211_rx_status *rx_status) 2788 { 2789 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 2790 int i; 2791 2792 lq_sta->pers.chains = rx_status->chains; 2793 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0]; 2794 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1]; 2795 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2]; 2796 lq_sta->pers.last_rssi = S8_MIN; 2797 2798 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { 2799 if (!(lq_sta->pers.chains & BIT(i))) 2800 continue; 2801 2802 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi) 2803 lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i]; 2804 } 2805 } 2806 2807 /** 2808 * rs_initialize_lq - Initialize a station's hardware rate table 2809 * 2810 * The uCode's station table contains a table of fallback rates 2811 * for automatic fallback during transmission. 2812 * 2813 * NOTE: This sets up a default set of values. These will be replaced later 2814 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of 2815 * rc80211_simple. 2816 * 2817 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before 2818 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD, 2819 * which requires station table entry to exist). 2820 */ 2821 static void rs_initialize_lq(struct iwl_mvm *mvm, 2822 struct ieee80211_sta *sta, 2823 struct iwl_lq_sta *lq_sta, 2824 enum nl80211_band band, 2825 bool init) 2826 { 2827 struct iwl_scale_tbl_info *tbl; 2828 struct rs_rate *rate; 2829 u8 active_tbl = 0; 2830 2831 if (!sta || !lq_sta) 2832 return; 2833 2834 if (!lq_sta->search_better_tbl) 2835 active_tbl = lq_sta->active_tbl; 2836 else 2837 active_tbl = 1 - lq_sta->active_tbl; 2838 2839 tbl = &(lq_sta->lq_info[active_tbl]); 2840 rate = &tbl->rate; 2841 2842 rs_get_initial_rate(mvm, sta, lq_sta, band, rate); 2843 rs_init_optimal_rate(mvm, sta, lq_sta); 2844 2845 WARN_ONCE(rate->ant != ANT_A && rate->ant != ANT_B, 2846 "ant: 0x%x, chains 0x%x, fw tx ant: 0x%x, nvm tx ant: 0x%x\n", 2847 rate->ant, lq_sta->pers.chains, mvm->fw->valid_tx_ant, 2848 mvm->nvm_data ? mvm->nvm_data->valid_tx_ant : ANT_INVALID); 2849 2850 tbl->column = rs_get_column_from_rate(rate); 2851 2852 rs_set_expected_tpt_table(lq_sta, tbl); 2853 rs_fill_lq_cmd(mvm, sta, lq_sta, rate); 2854 /* TODO restore station should remember the lq cmd */ 2855 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init); 2856 } 2857 2858 static void rs_drv_get_rate(void *mvm_r, struct ieee80211_sta *sta, 2859 void *mvm_sta, 2860 struct ieee80211_tx_rate_control *txrc) 2861 { 2862 struct iwl_op_mode *op_mode = mvm_r; 2863 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 2864 struct sk_buff *skb = txrc->skb; 2865 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2866 struct iwl_lq_sta *lq_sta; 2867 struct rs_rate *optimal_rate; 2868 u32 last_ucode_rate; 2869 2870 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) { 2871 /* if vif isn't initialized mvm doesn't know about 2872 * this station, so don't do anything with the it 2873 */ 2874 sta = NULL; 2875 mvm_sta = NULL; 2876 } 2877 2878 /* Send management frames and NO_ACK data using lowest rate. */ 2879 if (rate_control_send_low(sta, mvm_sta, txrc)) 2880 return; 2881 2882 if (!mvm_sta) 2883 return; 2884 2885 lq_sta = mvm_sta; 2886 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags, 2887 info->band, &info->control.rates[0]); 2888 info->control.rates[0].count = 1; 2889 2890 /* Report the optimal rate based on rssi and STA caps if we haven't 2891 * converged yet (too little traffic) or exploring other modulations 2892 */ 2893 if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) { 2894 optimal_rate = rs_get_optimal_rate(mvm, lq_sta); 2895 last_ucode_rate = ucode_rate_from_rs_rate(mvm, 2896 optimal_rate); 2897 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band, 2898 &txrc->reported_rate); 2899 } 2900 } 2901 2902 static void *rs_drv_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta, 2903 gfp_t gfp) 2904 { 2905 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 2906 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate; 2907 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 2908 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 2909 2910 IWL_DEBUG_RATE(mvm, "create station rate scale window\n"); 2911 2912 lq_sta->pers.drv = mvm; 2913 #ifdef CONFIG_MAC80211_DEBUGFS 2914 lq_sta->pers.dbg_fixed_rate = 0; 2915 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID; 2916 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 2917 #endif 2918 lq_sta->pers.chains = 0; 2919 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal)); 2920 lq_sta->pers.last_rssi = S8_MIN; 2921 2922 return lq_sta; 2923 } 2924 2925 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap, 2926 int nss) 2927 { 2928 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) & 2929 (0x3 << (2 * (nss - 1))); 2930 rx_mcs >>= (2 * (nss - 1)); 2931 2932 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7) 2933 return IWL_RATE_MCS_7_INDEX; 2934 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8) 2935 return IWL_RATE_MCS_8_INDEX; 2936 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9) 2937 return IWL_RATE_MCS_9_INDEX; 2938 2939 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED); 2940 return -1; 2941 } 2942 2943 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta, 2944 struct ieee80211_sta_vht_cap *vht_cap, 2945 struct iwl_lq_sta *lq_sta) 2946 { 2947 int i; 2948 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1); 2949 2950 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 2951 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 2952 if (i == IWL_RATE_9M_INDEX) 2953 continue; 2954 2955 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 2956 if (i == IWL_RATE_MCS_9_INDEX && 2957 sta->bandwidth == IEEE80211_STA_RX_BW_20) 2958 continue; 2959 2960 lq_sta->active_siso_rate |= BIT(i); 2961 } 2962 } 2963 2964 if (sta->rx_nss < 2) 2965 return; 2966 2967 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2); 2968 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 2969 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 2970 if (i == IWL_RATE_9M_INDEX) 2971 continue; 2972 2973 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 2974 if (i == IWL_RATE_MCS_9_INDEX && 2975 sta->bandwidth == IEEE80211_STA_RX_BW_20) 2976 continue; 2977 2978 lq_sta->active_mimo2_rate |= BIT(i); 2979 } 2980 } 2981 } 2982 2983 static void rs_ht_init(struct iwl_mvm *mvm, 2984 struct ieee80211_sta *sta, 2985 struct iwl_lq_sta *lq_sta, 2986 struct ieee80211_sta_ht_cap *ht_cap) 2987 { 2988 /* active_siso_rate mask includes 9 MBits (bit 5), 2989 * and CCK (bits 0-3), supp_rates[] does not; 2990 * shift to convert format, force 9 MBits off. 2991 */ 2992 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1; 2993 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1; 2994 lq_sta->active_siso_rate &= ~((u16)0x2); 2995 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE; 2996 2997 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1; 2998 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1; 2999 lq_sta->active_mimo2_rate &= ~((u16)0x2); 3000 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE; 3001 3002 if (mvm->cfg->ht_params->ldpc && 3003 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING)) 3004 lq_sta->ldpc = true; 3005 3006 if (mvm->cfg->ht_params->stbc && 3007 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 3008 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC)) 3009 lq_sta->stbc_capable = true; 3010 3011 lq_sta->is_vht = false; 3012 } 3013 3014 static void rs_vht_init(struct iwl_mvm *mvm, 3015 struct ieee80211_sta *sta, 3016 struct iwl_lq_sta *lq_sta, 3017 struct ieee80211_sta_vht_cap *vht_cap) 3018 { 3019 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta); 3020 3021 if (mvm->cfg->ht_params->ldpc && 3022 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC)) 3023 lq_sta->ldpc = true; 3024 3025 if (mvm->cfg->ht_params->stbc && 3026 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 3027 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK)) 3028 lq_sta->stbc_capable = true; 3029 3030 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) && 3031 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 3032 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE)) 3033 lq_sta->bfer_capable = true; 3034 3035 lq_sta->is_vht = true; 3036 } 3037 3038 #ifdef CONFIG_IWLWIFI_DEBUGFS 3039 void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm) 3040 { 3041 spin_lock_bh(&mvm->drv_stats_lock); 3042 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats)); 3043 spin_unlock_bh(&mvm->drv_stats_lock); 3044 } 3045 3046 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg) 3047 { 3048 u8 nss = 0; 3049 3050 spin_lock(&mvm->drv_stats_lock); 3051 3052 if (agg) 3053 mvm->drv_rx_stats.agg_frames++; 3054 3055 mvm->drv_rx_stats.success_frames++; 3056 3057 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { 3058 case RATE_MCS_CHAN_WIDTH_20: 3059 mvm->drv_rx_stats.bw_20_frames++; 3060 break; 3061 case RATE_MCS_CHAN_WIDTH_40: 3062 mvm->drv_rx_stats.bw_40_frames++; 3063 break; 3064 case RATE_MCS_CHAN_WIDTH_80: 3065 mvm->drv_rx_stats.bw_80_frames++; 3066 break; 3067 case RATE_MCS_CHAN_WIDTH_160: 3068 mvm->drv_rx_stats.bw_160_frames++; 3069 break; 3070 default: 3071 WARN_ONCE(1, "bad BW. rate 0x%x", rate); 3072 } 3073 3074 if (rate & RATE_MCS_HT_MSK) { 3075 mvm->drv_rx_stats.ht_frames++; 3076 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1; 3077 } else if (rate & RATE_MCS_VHT_MSK) { 3078 mvm->drv_rx_stats.vht_frames++; 3079 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >> 3080 RATE_VHT_MCS_NSS_POS) + 1; 3081 } else { 3082 mvm->drv_rx_stats.legacy_frames++; 3083 } 3084 3085 if (nss == 1) 3086 mvm->drv_rx_stats.siso_frames++; 3087 else if (nss == 2) 3088 mvm->drv_rx_stats.mimo2_frames++; 3089 3090 if (rate & RATE_MCS_SGI_MSK) 3091 mvm->drv_rx_stats.sgi_frames++; 3092 else 3093 mvm->drv_rx_stats.ngi_frames++; 3094 3095 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate; 3096 mvm->drv_rx_stats.last_frame_idx = 3097 (mvm->drv_rx_stats.last_frame_idx + 1) % 3098 ARRAY_SIZE(mvm->drv_rx_stats.last_rates); 3099 3100 spin_unlock(&mvm->drv_stats_lock); 3101 } 3102 #endif 3103 3104 /* 3105 * Called after adding a new station to initialize rate scaling 3106 */ 3107 static void rs_drv_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 3108 enum nl80211_band band, bool init) 3109 { 3110 int i, j; 3111 struct ieee80211_hw *hw = mvm->hw; 3112 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 3113 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; 3114 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3115 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 3116 struct ieee80211_supported_band *sband; 3117 unsigned long supp; /* must be unsigned long for for_each_set_bit */ 3118 3119 /* clear all non-persistent lq data */ 3120 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers)); 3121 3122 sband = hw->wiphy->bands[band]; 3123 3124 lq_sta->lq.sta_id = mvmsta->sta_id; 3125 mvmsta->tlc_amsdu = false; 3126 3127 for (j = 0; j < LQ_SIZE; j++) 3128 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]); 3129 3130 lq_sta->flush_timer = 0; 3131 lq_sta->last_tx = jiffies; 3132 3133 IWL_DEBUG_RATE(mvm, 3134 "LQ: *** rate scale station global init for station %d ***\n", 3135 mvmsta->sta_id); 3136 /* TODO: what is a good starting rate for STA? About middle? Maybe not 3137 * the lowest or the highest rate.. Could consider using RSSI from 3138 * previous packets? Need to have IEEE 802.1X auth succeed immediately 3139 * after assoc.. */ 3140 3141 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX; 3142 lq_sta->band = sband->band; 3143 /* 3144 * active legacy rates as per supported rates bitmap 3145 */ 3146 supp = sta->supp_rates[sband->band]; 3147 lq_sta->active_legacy_rate = 0; 3148 for_each_set_bit(i, &supp, BITS_PER_LONG) 3149 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value); 3150 3151 /* TODO: should probably account for rx_highest for both HT/VHT */ 3152 if (!vht_cap || !vht_cap->vht_supported) 3153 rs_ht_init(mvm, sta, lq_sta, ht_cap); 3154 else 3155 rs_vht_init(mvm, sta, lq_sta, vht_cap); 3156 3157 lq_sta->max_legacy_rate_idx = 3158 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate); 3159 lq_sta->max_siso_rate_idx = 3160 rs_get_max_rate_from_mask(lq_sta->active_siso_rate); 3161 lq_sta->max_mimo2_rate_idx = 3162 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate); 3163 3164 IWL_DEBUG_RATE(mvm, 3165 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n", 3166 lq_sta->active_legacy_rate, 3167 lq_sta->active_siso_rate, 3168 lq_sta->active_mimo2_rate, 3169 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable, 3170 lq_sta->bfer_capable); 3171 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n", 3172 lq_sta->max_legacy_rate_idx, 3173 lq_sta->max_siso_rate_idx, 3174 lq_sta->max_mimo2_rate_idx); 3175 3176 /* These values will be overridden later */ 3177 lq_sta->lq.single_stream_ant_msk = 3178 first_antenna(iwl_mvm_get_valid_tx_ant(mvm)); 3179 lq_sta->lq.dual_stream_ant_msk = ANT_AB; 3180 3181 /* as default allow aggregation for all tids */ 3182 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID; 3183 lq_sta->is_agg = 0; 3184 #ifdef CONFIG_IWLWIFI_DEBUGFS 3185 iwl_mvm_reset_frame_stats(mvm); 3186 #endif 3187 rs_initialize_lq(mvm, sta, lq_sta, band, init); 3188 } 3189 3190 static void rs_drv_rate_update(void *mvm_r, 3191 struct ieee80211_supported_band *sband, 3192 struct cfg80211_chan_def *chandef, 3193 struct ieee80211_sta *sta, 3194 void *priv_sta, u32 changed) 3195 { 3196 struct iwl_op_mode *op_mode = mvm_r; 3197 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 3198 u8 tid; 3199 3200 if (!iwl_mvm_sta_from_mac80211(sta)->vif) 3201 return; 3202 3203 /* Stop any ongoing aggregations as rs starts off assuming no agg */ 3204 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++) 3205 ieee80211_stop_tx_ba_session(sta, tid); 3206 3207 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false); 3208 } 3209 3210 #ifdef CONFIG_MAC80211_DEBUGFS 3211 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm, 3212 struct iwl_lq_cmd *lq_cmd, 3213 enum nl80211_band band, 3214 u32 ucode_rate) 3215 { 3216 struct rs_rate rate; 3217 int i; 3218 int num_rates = ARRAY_SIZE(lq_cmd->rs_table); 3219 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate); 3220 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; 3221 3222 for (i = 0; i < num_rates; i++) 3223 lq_cmd->rs_table[i] = ucode_rate_le32; 3224 3225 rs_rate_from_ucode_rate(ucode_rate, band, &rate); 3226 3227 if (is_mimo(&rate)) 3228 lq_cmd->mimo_delim = num_rates - 1; 3229 else 3230 lq_cmd->mimo_delim = 0; 3231 3232 lq_cmd->reduced_tpc = 0; 3233 3234 if (num_of_ant(ant) == 1) 3235 lq_cmd->single_stream_ant_msk = ant; 3236 3237 if (!mvm->trans->cfg->gen2) 3238 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF; 3239 else 3240 lq_cmd->agg_frame_cnt_limit = 3241 LINK_QUAL_AGG_FRAME_LIMIT_GEN2_DEF; 3242 } 3243 #endif /* CONFIG_MAC80211_DEBUGFS */ 3244 3245 static void rs_fill_rates_for_column(struct iwl_mvm *mvm, 3246 struct iwl_lq_sta *lq_sta, 3247 struct rs_rate *rate, 3248 __le32 *rs_table, int *rs_table_index, 3249 int num_rates, int num_retries, 3250 u8 valid_tx_ant, bool toggle_ant) 3251 { 3252 int i, j; 3253 __le32 ucode_rate; 3254 bool bottom_reached = false; 3255 int prev_rate_idx = rate->index; 3256 int end = LINK_QUAL_MAX_RETRY_NUM; 3257 int index = *rs_table_index; 3258 3259 for (i = 0; i < num_rates && index < end; i++) { 3260 for (j = 0; j < num_retries && index < end; j++, index++) { 3261 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm, 3262 rate)); 3263 rs_table[index] = ucode_rate; 3264 if (toggle_ant) 3265 rs_toggle_antenna(valid_tx_ant, rate); 3266 } 3267 3268 prev_rate_idx = rate->index; 3269 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate); 3270 if (bottom_reached && !is_legacy(rate)) 3271 break; 3272 } 3273 3274 if (!bottom_reached && !is_legacy(rate)) 3275 rate->index = prev_rate_idx; 3276 3277 *rs_table_index = index; 3278 } 3279 3280 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI 3281 * column the rate table should look like this: 3282 * 3283 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 3284 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 3285 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 3286 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 3287 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 3288 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 3289 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI 3290 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI 3291 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI 3292 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps 3293 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps 3294 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps 3295 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps 3296 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps 3297 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps 3298 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps 3299 */ 3300 static void rs_build_rates_table(struct iwl_mvm *mvm, 3301 struct ieee80211_sta *sta, 3302 struct iwl_lq_sta *lq_sta, 3303 const struct rs_rate *initial_rate) 3304 { 3305 struct rs_rate rate; 3306 int num_rates, num_retries, index = 0; 3307 u8 valid_tx_ant = 0; 3308 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3309 bool toggle_ant = false; 3310 u32 color; 3311 3312 memcpy(&rate, initial_rate, sizeof(rate)); 3313 3314 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 3315 3316 /* TODO: remove old API when min FW API hits 14 */ 3317 if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) && 3318 rs_stbc_allow(mvm, sta, lq_sta)) 3319 rate.stbc = true; 3320 3321 if (is_siso(&rate)) { 3322 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES; 3323 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3324 } else if (is_mimo(&rate)) { 3325 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES; 3326 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3327 } else { 3328 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES; 3329 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES; 3330 toggle_ant = true; 3331 } 3332 3333 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3334 num_rates, num_retries, valid_tx_ant, 3335 toggle_ant); 3336 3337 rs_get_lower_rate_down_column(lq_sta, &rate); 3338 3339 if (is_siso(&rate)) { 3340 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES; 3341 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES; 3342 lq_cmd->mimo_delim = index; 3343 } else if (is_legacy(&rate)) { 3344 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3345 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3346 } else { 3347 WARN_ON_ONCE(1); 3348 } 3349 3350 toggle_ant = true; 3351 3352 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3353 num_rates, num_retries, valid_tx_ant, 3354 toggle_ant); 3355 3356 rs_get_lower_rate_down_column(lq_sta, &rate); 3357 3358 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3359 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3360 3361 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3362 num_rates, num_retries, valid_tx_ant, 3363 toggle_ant); 3364 3365 /* update the color of the LQ command (as a counter at bits 1-3) */ 3366 color = LQ_FLAGS_COLOR_INC(LQ_FLAG_COLOR_GET(lq_cmd->flags)); 3367 lq_cmd->flags = LQ_FLAG_COLOR_SET(lq_cmd->flags, color); 3368 } 3369 3370 struct rs_bfer_active_iter_data { 3371 struct ieee80211_sta *exclude_sta; 3372 struct iwl_mvm_sta *bfer_mvmsta; 3373 }; 3374 3375 static void rs_bfer_active_iter(void *_data, 3376 struct ieee80211_sta *sta) 3377 { 3378 struct rs_bfer_active_iter_data *data = _data; 3379 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3380 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.rs_drv.lq; 3381 u32 ss_params = le32_to_cpu(lq_cmd->ss_params); 3382 3383 if (sta == data->exclude_sta) 3384 return; 3385 3386 /* The current sta has BFER allowed */ 3387 if (ss_params & LQ_SS_BFER_ALLOWED) { 3388 WARN_ON_ONCE(data->bfer_mvmsta != NULL); 3389 3390 data->bfer_mvmsta = mvmsta; 3391 } 3392 } 3393 3394 static int rs_bfer_priority(struct iwl_mvm_sta *sta) 3395 { 3396 int prio = -1; 3397 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif); 3398 3399 switch (viftype) { 3400 case NL80211_IFTYPE_AP: 3401 case NL80211_IFTYPE_P2P_GO: 3402 prio = 3; 3403 break; 3404 case NL80211_IFTYPE_P2P_CLIENT: 3405 prio = 2; 3406 break; 3407 case NL80211_IFTYPE_STATION: 3408 prio = 1; 3409 break; 3410 default: 3411 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id); 3412 prio = -1; 3413 } 3414 3415 return prio; 3416 } 3417 3418 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */ 3419 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1, 3420 struct iwl_mvm_sta *sta2) 3421 { 3422 int prio1 = rs_bfer_priority(sta1); 3423 int prio2 = rs_bfer_priority(sta2); 3424 3425 if (prio1 > prio2) 3426 return 1; 3427 if (prio1 < prio2) 3428 return -1; 3429 return 0; 3430 } 3431 3432 static void rs_set_lq_ss_params(struct iwl_mvm *mvm, 3433 struct ieee80211_sta *sta, 3434 struct iwl_lq_sta *lq_sta, 3435 const struct rs_rate *initial_rate) 3436 { 3437 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3438 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3439 struct rs_bfer_active_iter_data data = { 3440 .exclude_sta = sta, 3441 .bfer_mvmsta = NULL, 3442 }; 3443 struct iwl_mvm_sta *bfer_mvmsta = NULL; 3444 u32 ss_params = LQ_SS_PARAMS_VALID; 3445 3446 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 3447 goto out; 3448 3449 #ifdef CONFIG_MAC80211_DEBUGFS 3450 /* Check if forcing the decision is configured. 3451 * Note that SISO is forced by not allowing STBC or BFER 3452 */ 3453 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC) 3454 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE); 3455 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER) 3456 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE); 3457 3458 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) { 3459 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n", 3460 lq_sta->pers.ss_force); 3461 goto out; 3462 } 3463 #endif 3464 3465 if (lq_sta->stbc_capable) 3466 ss_params |= LQ_SS_STBC_1SS_ALLOWED; 3467 3468 if (!lq_sta->bfer_capable) 3469 goto out; 3470 3471 ieee80211_iterate_stations_atomic(mvm->hw, 3472 rs_bfer_active_iter, 3473 &data); 3474 bfer_mvmsta = data.bfer_mvmsta; 3475 3476 /* This code is safe as it doesn't run concurrently for different 3477 * stations. This is guaranteed by the fact that calls to 3478 * ieee80211_tx_status wouldn't run concurrently for a single HW. 3479 */ 3480 if (!bfer_mvmsta) { 3481 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n"); 3482 3483 ss_params |= LQ_SS_BFER_ALLOWED; 3484 goto out; 3485 } 3486 3487 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n", 3488 bfer_mvmsta->sta_id); 3489 3490 /* Disallow BFER on another STA if active and we're a higher priority */ 3491 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) { 3492 struct iwl_lq_cmd *bfersta_lq_cmd = 3493 &bfer_mvmsta->lq_sta.rs_drv.lq; 3494 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params); 3495 3496 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED; 3497 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params); 3498 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false); 3499 3500 ss_params |= LQ_SS_BFER_ALLOWED; 3501 IWL_DEBUG_RATE(mvm, 3502 "Lower priority BFER sta found (%d). Switch BFER\n", 3503 bfer_mvmsta->sta_id); 3504 } 3505 out: 3506 lq_cmd->ss_params = cpu_to_le32(ss_params); 3507 } 3508 3509 static void rs_fill_lq_cmd(struct iwl_mvm *mvm, 3510 struct ieee80211_sta *sta, 3511 struct iwl_lq_sta *lq_sta, 3512 const struct rs_rate *initial_rate) 3513 { 3514 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3515 struct iwl_mvm_sta *mvmsta; 3516 struct iwl_mvm_vif *mvmvif; 3517 3518 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START; 3519 lq_cmd->agg_time_limit = 3520 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT); 3521 3522 #ifdef CONFIG_MAC80211_DEBUGFS 3523 if (lq_sta->pers.dbg_fixed_rate) { 3524 rs_build_rates_table_from_fixed(mvm, lq_cmd, 3525 lq_sta->band, 3526 lq_sta->pers.dbg_fixed_rate); 3527 return; 3528 } 3529 #endif 3530 if (WARN_ON_ONCE(!sta || !initial_rate)) 3531 return; 3532 3533 rs_build_rates_table(mvm, sta, lq_sta, initial_rate); 3534 3535 if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS)) 3536 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate); 3537 3538 mvmsta = iwl_mvm_sta_from_mac80211(sta); 3539 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif); 3540 3541 if (num_of_ant(initial_rate->ant) == 1) 3542 lq_cmd->single_stream_ant_msk = initial_rate->ant; 3543 3544 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize; 3545 3546 /* 3547 * In case of low latency, tell the firmware to leave a frame in the 3548 * Tx Fifo so that it can start a transaction in the same TxOP. This 3549 * basically allows the firmware to send bursts. 3550 */ 3551 if (iwl_mvm_vif_low_latency(mvmvif)) 3552 lq_cmd->agg_frame_cnt_limit--; 3553 3554 if (mvmsta->vif->p2p) 3555 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK; 3556 3557 lq_cmd->agg_time_limit = 3558 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta)); 3559 } 3560 3561 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) 3562 { 3563 return hw->priv; 3564 } 3565 3566 /* rate scale requires free function to be implemented */ 3567 static void rs_free(void *mvm_rate) 3568 { 3569 return; 3570 } 3571 3572 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta) 3573 { 3574 struct iwl_op_mode *op_mode __maybe_unused = mvm_r; 3575 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 3576 3577 IWL_DEBUG_RATE(mvm, "enter\n"); 3578 IWL_DEBUG_RATE(mvm, "leave\n"); 3579 } 3580 3581 #ifdef CONFIG_MAC80211_DEBUGFS 3582 int rs_pretty_print_rate(char *buf, int bufsz, const u32 rate) 3583 { 3584 3585 char *type, *bw; 3586 u8 mcs = 0, nss = 0; 3587 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; 3588 3589 if (!(rate & RATE_MCS_HT_MSK) && 3590 !(rate & RATE_MCS_VHT_MSK)) { 3591 int index = iwl_hwrate_to_plcp_idx(rate); 3592 3593 return scnprintf(buf, bufsz, "Legacy | ANT: %s Rate: %s Mbps\n", 3594 rs_pretty_ant(ant), 3595 index == IWL_RATE_INVALID ? "BAD" : 3596 iwl_rate_mcs[index].mbps); 3597 } 3598 3599 if (rate & RATE_MCS_VHT_MSK) { 3600 type = "VHT"; 3601 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK; 3602 nss = ((rate & RATE_VHT_MCS_NSS_MSK) 3603 >> RATE_VHT_MCS_NSS_POS) + 1; 3604 } else if (rate & RATE_MCS_HT_MSK) { 3605 type = "HT"; 3606 mcs = rate & RATE_HT_MCS_INDEX_MSK; 3607 nss = ((rate & RATE_HT_MCS_NSS_MSK) 3608 >> RATE_HT_MCS_NSS_POS) + 1; 3609 } else { 3610 type = "Unknown"; /* shouldn't happen */ 3611 } 3612 3613 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { 3614 case RATE_MCS_CHAN_WIDTH_20: 3615 bw = "20Mhz"; 3616 break; 3617 case RATE_MCS_CHAN_WIDTH_40: 3618 bw = "40Mhz"; 3619 break; 3620 case RATE_MCS_CHAN_WIDTH_80: 3621 bw = "80Mhz"; 3622 break; 3623 case RATE_MCS_CHAN_WIDTH_160: 3624 bw = "160Mhz"; 3625 break; 3626 default: 3627 bw = "BAD BW"; 3628 } 3629 3630 return scnprintf(buf, bufsz, 3631 "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s\n", 3632 type, rs_pretty_ant(ant), bw, mcs, nss, 3633 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ", 3634 (rate & RATE_MCS_STBC_MSK) ? "STBC " : "", 3635 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "", 3636 (rate & RATE_MCS_BF_MSK) ? "BF " : ""); 3637 } 3638 3639 /** 3640 * Program the device to use fixed rate for frame transmit 3641 * This is for debugging/testing only 3642 * once the device start use fixed rate, we need to reload the module 3643 * to being back the normal operation. 3644 */ 3645 static void rs_program_fix_rate(struct iwl_mvm *mvm, 3646 struct iwl_lq_sta *lq_sta) 3647 { 3648 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */ 3649 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3650 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3651 3652 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n", 3653 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate); 3654 3655 if (lq_sta->pers.dbg_fixed_rate) { 3656 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL); 3657 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false); 3658 } 3659 } 3660 3661 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file, 3662 const char __user *user_buf, size_t count, loff_t *ppos) 3663 { 3664 struct iwl_lq_sta *lq_sta = file->private_data; 3665 struct iwl_mvm *mvm; 3666 char buf[64]; 3667 size_t buf_size; 3668 u32 parsed_rate; 3669 3670 mvm = lq_sta->pers.drv; 3671 memset(buf, 0, sizeof(buf)); 3672 buf_size = min(count, sizeof(buf) - 1); 3673 if (copy_from_user(buf, user_buf, buf_size)) 3674 return -EFAULT; 3675 3676 if (sscanf(buf, "%x", &parsed_rate) == 1) 3677 lq_sta->pers.dbg_fixed_rate = parsed_rate; 3678 else 3679 lq_sta->pers.dbg_fixed_rate = 0; 3680 3681 rs_program_fix_rate(mvm, lq_sta); 3682 3683 return count; 3684 } 3685 3686 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file, 3687 char __user *user_buf, size_t count, loff_t *ppos) 3688 { 3689 char *buff; 3690 int desc = 0; 3691 int i = 0; 3692 ssize_t ret; 3693 static const size_t bufsz = 2048; 3694 3695 struct iwl_lq_sta *lq_sta = file->private_data; 3696 struct iwl_mvm_sta *mvmsta = 3697 container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv); 3698 struct iwl_mvm *mvm; 3699 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 3700 struct rs_rate *rate = &tbl->rate; 3701 u32 ss_params; 3702 3703 mvm = lq_sta->pers.drv; 3704 buff = kmalloc(bufsz, GFP_KERNEL); 3705 if (!buff) 3706 return -ENOMEM; 3707 3708 desc += scnprintf(buff + desc, bufsz - desc, 3709 "sta_id %d\n", lq_sta->lq.sta_id); 3710 desc += scnprintf(buff + desc, bufsz - desc, 3711 "failed=%d success=%d rate=0%lX\n", 3712 lq_sta->total_failed, lq_sta->total_success, 3713 lq_sta->active_legacy_rate); 3714 desc += scnprintf(buff + desc, bufsz - desc, "fixed rate 0x%X\n", 3715 lq_sta->pers.dbg_fixed_rate); 3716 desc += scnprintf(buff + desc, bufsz - desc, "valid_tx_ant %s%s%s\n", 3717 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "", 3718 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "", 3719 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : ""); 3720 desc += scnprintf(buff + desc, bufsz - desc, "lq type %s\n", 3721 (is_legacy(rate)) ? "legacy" : 3722 is_vht(rate) ? "VHT" : "HT"); 3723 if (!is_legacy(rate)) { 3724 desc += scnprintf(buff + desc, bufsz - desc, " %s", 3725 (is_siso(rate)) ? "SISO" : "MIMO2"); 3726 desc += scnprintf(buff + desc, bufsz - desc, " %s", 3727 (is_ht20(rate)) ? "20MHz" : 3728 (is_ht40(rate)) ? "40MHz" : 3729 (is_ht80(rate)) ? "80MHz" : 3730 (is_ht160(rate)) ? "160MHz" : "BAD BW"); 3731 desc += scnprintf(buff + desc, bufsz - desc, " %s %s %s %s\n", 3732 (rate->sgi) ? "SGI" : "NGI", 3733 (rate->ldpc) ? "LDPC" : "BCC", 3734 (lq_sta->is_agg) ? "AGG on" : "", 3735 (mvmsta->tlc_amsdu) ? "AMSDU on" : ""); 3736 } 3737 desc += scnprintf(buff + desc, bufsz - desc, "last tx rate=0x%X\n", 3738 lq_sta->last_rate_n_flags); 3739 desc += scnprintf(buff + desc, bufsz - desc, 3740 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n", 3741 lq_sta->lq.flags, 3742 lq_sta->lq.mimo_delim, 3743 lq_sta->lq.single_stream_ant_msk, 3744 lq_sta->lq.dual_stream_ant_msk); 3745 3746 desc += scnprintf(buff + desc, bufsz - desc, 3747 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n", 3748 le16_to_cpu(lq_sta->lq.agg_time_limit), 3749 lq_sta->lq.agg_disable_start_th, 3750 lq_sta->lq.agg_frame_cnt_limit); 3751 3752 desc += scnprintf(buff + desc, bufsz - desc, "reduced tpc=%d\n", 3753 lq_sta->lq.reduced_tpc); 3754 ss_params = le32_to_cpu(lq_sta->lq.ss_params); 3755 desc += scnprintf(buff + desc, bufsz - desc, 3756 "single stream params: %s%s%s%s\n", 3757 (ss_params & LQ_SS_PARAMS_VALID) ? 3758 "VALID" : "INVALID", 3759 (ss_params & LQ_SS_BFER_ALLOWED) ? 3760 ", BFER" : "", 3761 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ? 3762 ", STBC" : "", 3763 (ss_params & LQ_SS_FORCE) ? 3764 ", FORCE" : ""); 3765 desc += scnprintf(buff + desc, bufsz - desc, 3766 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n", 3767 lq_sta->lq.initial_rate_index[0], 3768 lq_sta->lq.initial_rate_index[1], 3769 lq_sta->lq.initial_rate_index[2], 3770 lq_sta->lq.initial_rate_index[3]); 3771 3772 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) { 3773 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]); 3774 3775 desc += scnprintf(buff + desc, bufsz - desc, 3776 " rate[%d] 0x%X ", i, r); 3777 desc += rs_pretty_print_rate(buff + desc, bufsz - desc, r); 3778 } 3779 3780 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3781 kfree(buff); 3782 return ret; 3783 } 3784 3785 static const struct file_operations rs_sta_dbgfs_scale_table_ops = { 3786 .write = rs_sta_dbgfs_scale_table_write, 3787 .read = rs_sta_dbgfs_scale_table_read, 3788 .open = simple_open, 3789 .llseek = default_llseek, 3790 }; 3791 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file, 3792 char __user *user_buf, size_t count, loff_t *ppos) 3793 { 3794 char *buff; 3795 int desc = 0; 3796 int i, j; 3797 ssize_t ret; 3798 struct iwl_scale_tbl_info *tbl; 3799 struct rs_rate *rate; 3800 struct iwl_lq_sta *lq_sta = file->private_data; 3801 3802 buff = kmalloc(1024, GFP_KERNEL); 3803 if (!buff) 3804 return -ENOMEM; 3805 3806 for (i = 0; i < LQ_SIZE; i++) { 3807 tbl = &(lq_sta->lq_info[i]); 3808 rate = &tbl->rate; 3809 desc += sprintf(buff+desc, 3810 "%s type=%d SGI=%d BW=%s DUP=0\n" 3811 "index=%d\n", 3812 lq_sta->active_tbl == i ? "*" : "x", 3813 rate->type, 3814 rate->sgi, 3815 is_ht20(rate) ? "20MHz" : 3816 is_ht40(rate) ? "40MHz" : 3817 is_ht80(rate) ? "80MHz" : 3818 is_ht160(rate) ? "160MHz" : "ERR", 3819 rate->index); 3820 for (j = 0; j < IWL_RATE_COUNT; j++) { 3821 desc += sprintf(buff+desc, 3822 "counter=%d success=%d %%=%d\n", 3823 tbl->win[j].counter, 3824 tbl->win[j].success_counter, 3825 tbl->win[j].success_ratio); 3826 } 3827 } 3828 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3829 kfree(buff); 3830 return ret; 3831 } 3832 3833 static const struct file_operations rs_sta_dbgfs_stats_table_ops = { 3834 .read = rs_sta_dbgfs_stats_table_read, 3835 .open = simple_open, 3836 .llseek = default_llseek, 3837 }; 3838 3839 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file, 3840 char __user *user_buf, 3841 size_t count, loff_t *ppos) 3842 { 3843 static const char * const column_name[] = { 3844 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A", 3845 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B", 3846 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A", 3847 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B", 3848 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI", 3849 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI", 3850 [RS_COLUMN_MIMO2] = "MIMO2", 3851 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI", 3852 }; 3853 3854 static const char * const rate_name[] = { 3855 [IWL_RATE_1M_INDEX] = "1M", 3856 [IWL_RATE_2M_INDEX] = "2M", 3857 [IWL_RATE_5M_INDEX] = "5.5M", 3858 [IWL_RATE_11M_INDEX] = "11M", 3859 [IWL_RATE_6M_INDEX] = "6M|MCS0", 3860 [IWL_RATE_9M_INDEX] = "9M", 3861 [IWL_RATE_12M_INDEX] = "12M|MCS1", 3862 [IWL_RATE_18M_INDEX] = "18M|MCS2", 3863 [IWL_RATE_24M_INDEX] = "24M|MCS3", 3864 [IWL_RATE_36M_INDEX] = "36M|MCS4", 3865 [IWL_RATE_48M_INDEX] = "48M|MCS5", 3866 [IWL_RATE_54M_INDEX] = "54M|MCS6", 3867 [IWL_RATE_MCS_7_INDEX] = "MCS7", 3868 [IWL_RATE_MCS_8_INDEX] = "MCS8", 3869 [IWL_RATE_MCS_9_INDEX] = "MCS9", 3870 }; 3871 3872 char *buff, *pos, *endpos; 3873 int col, rate; 3874 ssize_t ret; 3875 struct iwl_lq_sta *lq_sta = file->private_data; 3876 struct rs_rate_stats *stats; 3877 static const size_t bufsz = 1024; 3878 3879 buff = kmalloc(bufsz, GFP_KERNEL); 3880 if (!buff) 3881 return -ENOMEM; 3882 3883 pos = buff; 3884 endpos = pos + bufsz; 3885 3886 pos += scnprintf(pos, endpos - pos, "COLUMN,"); 3887 for (rate = 0; rate < IWL_RATE_COUNT; rate++) 3888 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]); 3889 pos += scnprintf(pos, endpos - pos, "\n"); 3890 3891 for (col = 0; col < RS_COLUMN_COUNT; col++) { 3892 pos += scnprintf(pos, endpos - pos, 3893 "%s,", column_name[col]); 3894 3895 for (rate = 0; rate < IWL_RATE_COUNT; rate++) { 3896 stats = &(lq_sta->pers.tx_stats[col][rate]); 3897 pos += scnprintf(pos, endpos - pos, 3898 "%llu/%llu,", 3899 stats->success, 3900 stats->total); 3901 } 3902 pos += scnprintf(pos, endpos - pos, "\n"); 3903 } 3904 3905 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff); 3906 kfree(buff); 3907 return ret; 3908 } 3909 3910 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file, 3911 const char __user *user_buf, 3912 size_t count, loff_t *ppos) 3913 { 3914 struct iwl_lq_sta *lq_sta = file->private_data; 3915 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats)); 3916 3917 return count; 3918 } 3919 3920 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = { 3921 .read = rs_sta_dbgfs_drv_tx_stats_read, 3922 .write = rs_sta_dbgfs_drv_tx_stats_write, 3923 .open = simple_open, 3924 .llseek = default_llseek, 3925 }; 3926 3927 static ssize_t iwl_dbgfs_ss_force_read(struct file *file, 3928 char __user *user_buf, 3929 size_t count, loff_t *ppos) 3930 { 3931 struct iwl_lq_sta *lq_sta = file->private_data; 3932 char buf[12]; 3933 int bufsz = sizeof(buf); 3934 int pos = 0; 3935 static const char * const ss_force_name[] = { 3936 [RS_SS_FORCE_NONE] = "none", 3937 [RS_SS_FORCE_STBC] = "stbc", 3938 [RS_SS_FORCE_BFER] = "bfer", 3939 [RS_SS_FORCE_SISO] = "siso", 3940 }; 3941 3942 pos += scnprintf(buf+pos, bufsz-pos, "%s\n", 3943 ss_force_name[lq_sta->pers.ss_force]); 3944 return simple_read_from_buffer(user_buf, count, ppos, buf, pos); 3945 } 3946 3947 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf, 3948 size_t count, loff_t *ppos) 3949 { 3950 struct iwl_mvm *mvm = lq_sta->pers.drv; 3951 int ret = 0; 3952 3953 if (!strncmp("none", buf, 4)) { 3954 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 3955 } else if (!strncmp("siso", buf, 4)) { 3956 lq_sta->pers.ss_force = RS_SS_FORCE_SISO; 3957 } else if (!strncmp("stbc", buf, 4)) { 3958 if (lq_sta->stbc_capable) { 3959 lq_sta->pers.ss_force = RS_SS_FORCE_STBC; 3960 } else { 3961 IWL_ERR(mvm, 3962 "can't force STBC. peer doesn't support\n"); 3963 ret = -EINVAL; 3964 } 3965 } else if (!strncmp("bfer", buf, 4)) { 3966 if (lq_sta->bfer_capable) { 3967 lq_sta->pers.ss_force = RS_SS_FORCE_BFER; 3968 } else { 3969 IWL_ERR(mvm, 3970 "can't force BFER. peer doesn't support\n"); 3971 ret = -EINVAL; 3972 } 3973 } else { 3974 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n"); 3975 ret = -EINVAL; 3976 } 3977 return ret ?: count; 3978 } 3979 3980 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \ 3981 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta) 3982 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \ 3983 if (!debugfs_create_file(#name, mode, parent, lq_sta, \ 3984 &iwl_dbgfs_##name##_ops)) \ 3985 goto err; \ 3986 } while (0) 3987 3988 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32); 3989 3990 static void rs_drv_add_sta_debugfs(void *mvm, void *priv_sta, 3991 struct dentry *dir) 3992 { 3993 struct iwl_lq_sta *lq_sta = priv_sta; 3994 struct iwl_mvm_sta *mvmsta; 3995 3996 mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv); 3997 3998 if (!mvmsta->vif) 3999 return; 4000 4001 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir, 4002 lq_sta, &rs_sta_dbgfs_scale_table_ops); 4003 debugfs_create_file("rate_stats_table", S_IRUSR, dir, 4004 lq_sta, &rs_sta_dbgfs_stats_table_ops); 4005 debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir, 4006 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops); 4007 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir, 4008 &lq_sta->tx_agg_tid_en); 4009 debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir, 4010 &lq_sta->pers.dbg_fixed_txp_reduction); 4011 4012 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR); 4013 return; 4014 err: 4015 IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n"); 4016 } 4017 4018 void rs_remove_sta_debugfs(void *mvm, void *mvm_sta) 4019 { 4020 } 4021 #endif 4022 4023 /* 4024 * Initialization of rate scaling information is done by driver after 4025 * the station is added. Since mac80211 calls this function before a 4026 * station is added we ignore it. 4027 */ 4028 static void rs_rate_init_ops(void *mvm_r, 4029 struct ieee80211_supported_band *sband, 4030 struct cfg80211_chan_def *chandef, 4031 struct ieee80211_sta *sta, void *mvm_sta) 4032 { 4033 } 4034 4035 /* ops for rate scaling implemented in the driver */ 4036 static const struct rate_control_ops rs_mvm_ops_drv = { 4037 .name = RS_NAME, 4038 .tx_status = rs_drv_mac80211_tx_status, 4039 .get_rate = rs_drv_get_rate, 4040 .rate_init = rs_rate_init_ops, 4041 .alloc = rs_alloc, 4042 .free = rs_free, 4043 .alloc_sta = rs_drv_alloc_sta, 4044 .free_sta = rs_free_sta, 4045 .rate_update = rs_drv_rate_update, 4046 #ifdef CONFIG_MAC80211_DEBUGFS 4047 .add_sta_debugfs = rs_drv_add_sta_debugfs, 4048 .remove_sta_debugfs = rs_remove_sta_debugfs, 4049 #endif 4050 }; 4051 4052 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 4053 enum nl80211_band band, bool init) 4054 { 4055 if (iwl_mvm_has_tlc_offload(mvm)) 4056 rs_fw_rate_init(mvm, sta, band); 4057 else 4058 rs_drv_rate_init(mvm, sta, band, init); 4059 } 4060 4061 int iwl_mvm_rate_control_register(void) 4062 { 4063 return ieee80211_rate_control_register(&rs_mvm_ops_drv); 4064 } 4065 4066 void iwl_mvm_rate_control_unregister(void) 4067 { 4068 ieee80211_rate_control_unregister(&rs_mvm_ops_drv); 4069 } 4070 4071 static int rs_drv_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 4072 bool enable) 4073 { 4074 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.rs_drv.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 4091 /** 4092 * iwl_mvm_tx_protection - ask FW to enable RTS/CTS protection 4093 * @mvmsta: The station 4094 * @enable: Enable Tx protection? 4095 */ 4096 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 4097 bool enable) 4098 { 4099 if (iwl_mvm_has_tlc_offload(mvm)) 4100 return rs_fw_tx_protection(mvm, mvmsta, enable); 4101 else 4102 return rs_drv_tx_protection(mvm, mvmsta, enable); 4103 } 4104