1 /****************************************************************************** 2 * 3 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved. 4 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH 5 * Copyright(c) 2016 Intel Deutschland GmbH 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of version 2 of the GNU General Public License as 9 * published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 14 * more details. 15 * 16 * You should have received a copy of the GNU General Public License along with 17 * this program; if not, write to the Free Software Foundation, Inc., 18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA 19 * 20 * The full GNU General Public License is included in this distribution in the 21 * file called LICENSE. 22 * 23 * Contact Information: 24 * Intel Linux Wireless <linuxwifi@intel.com> 25 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 26 * 27 *****************************************************************************/ 28 #include <linux/kernel.h> 29 #include <linux/skbuff.h> 30 #include <linux/slab.h> 31 #include <net/mac80211.h> 32 33 #include <linux/netdevice.h> 34 #include <linux/etherdevice.h> 35 #include <linux/delay.h> 36 37 #include <linux/workqueue.h> 38 #include "rs.h" 39 #include "fw-api.h" 40 #include "sta.h" 41 #include "iwl-op-mode.h" 42 #include "mvm.h" 43 #include "debugfs.h" 44 45 #define RS_NAME "iwl-mvm-rs" 46 47 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */ 48 49 /* Calculations of success ratio are done in fixed point where 12800 is 100%. 50 * Use this macro when dealing with thresholds consts set as a percentage 51 */ 52 #define RS_PERCENT(x) (128 * x) 53 54 static u8 rs_ht_to_legacy[] = { 55 [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX, 56 [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX, 57 [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX, 58 [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX, 59 [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX, 60 [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX, 61 [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX, 62 [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX, 63 [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX, 64 [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX, 65 }; 66 67 static const u8 ant_toggle_lookup[] = { 68 [ANT_NONE] = ANT_NONE, 69 [ANT_A] = ANT_B, 70 [ANT_B] = ANT_C, 71 [ANT_AB] = ANT_BC, 72 [ANT_C] = ANT_A, 73 [ANT_AC] = ANT_AB, 74 [ANT_BC] = ANT_AC, 75 [ANT_ABC] = ANT_ABC, 76 }; 77 78 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \ 79 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \ 80 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \ 81 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \ 82 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \ 83 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\ 84 IWL_RATE_##rp##M_INDEX, \ 85 IWL_RATE_##rn##M_INDEX } 86 87 #define IWL_DECLARE_MCS_RATE(s) \ 88 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \ 89 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \ 90 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \ 91 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \ 92 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \ 93 IWL_RATE_INVM_INDEX, \ 94 IWL_RATE_INVM_INDEX } 95 96 /* 97 * Parameter order: 98 * rate, ht rate, prev rate, next rate 99 * 100 * If there isn't a valid next or previous rate then INV is used which 101 * maps to IWL_RATE_INVALID 102 * 103 */ 104 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = { 105 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */ 106 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */ 107 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */ 108 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */ 109 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */ 110 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */ 111 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */ 112 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */ 113 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */ 114 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */ 115 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */ 116 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */ 117 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */ 118 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */ 119 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */ 120 }; 121 122 enum rs_action { 123 RS_ACTION_STAY = 0, 124 RS_ACTION_DOWNSCALE = -1, 125 RS_ACTION_UPSCALE = 1, 126 }; 127 128 enum rs_column_mode { 129 RS_INVALID = 0, 130 RS_LEGACY, 131 RS_SISO, 132 RS_MIMO2, 133 }; 134 135 #define MAX_NEXT_COLUMNS 7 136 #define MAX_COLUMN_CHECKS 3 137 138 struct rs_tx_column; 139 140 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm, 141 struct ieee80211_sta *sta, 142 struct rs_rate *rate, 143 const struct rs_tx_column *next_col); 144 145 struct rs_tx_column { 146 enum rs_column_mode mode; 147 u8 ant; 148 bool sgi; 149 enum rs_column next_columns[MAX_NEXT_COLUMNS]; 150 allow_column_func_t checks[MAX_COLUMN_CHECKS]; 151 }; 152 153 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 154 struct rs_rate *rate, 155 const struct rs_tx_column *next_col) 156 { 157 return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant); 158 } 159 160 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 161 struct rs_rate *rate, 162 const struct rs_tx_column *next_col) 163 { 164 struct iwl_mvm_sta *mvmsta; 165 struct iwl_mvm_vif *mvmvif; 166 167 if (!sta->ht_cap.ht_supported) 168 return false; 169 170 if (sta->smps_mode == IEEE80211_SMPS_STATIC) 171 return false; 172 173 if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2) 174 return false; 175 176 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 177 return false; 178 179 mvmsta = iwl_mvm_sta_from_mac80211(sta); 180 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif); 181 182 if (mvm->nvm_data->sku_cap_mimo_disabled) 183 return false; 184 185 return true; 186 } 187 188 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 189 struct rs_rate *rate, 190 const struct rs_tx_column *next_col) 191 { 192 if (!sta->ht_cap.ht_supported) 193 return false; 194 195 return true; 196 } 197 198 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 199 struct rs_rate *rate, 200 const struct rs_tx_column *next_col) 201 { 202 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 203 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; 204 205 if (is_ht20(rate) && (ht_cap->cap & 206 IEEE80211_HT_CAP_SGI_20)) 207 return true; 208 if (is_ht40(rate) && (ht_cap->cap & 209 IEEE80211_HT_CAP_SGI_40)) 210 return true; 211 if (is_ht80(rate) && (vht_cap->cap & 212 IEEE80211_VHT_CAP_SHORT_GI_80)) 213 return true; 214 if (is_ht160(rate) && (vht_cap->cap & 215 IEEE80211_VHT_CAP_SHORT_GI_160)) 216 return true; 217 218 return false; 219 } 220 221 static const struct rs_tx_column rs_tx_columns[] = { 222 [RS_COLUMN_LEGACY_ANT_A] = { 223 .mode = RS_LEGACY, 224 .ant = ANT_A, 225 .next_columns = { 226 RS_COLUMN_LEGACY_ANT_B, 227 RS_COLUMN_SISO_ANT_A, 228 RS_COLUMN_MIMO2, 229 RS_COLUMN_INVALID, 230 RS_COLUMN_INVALID, 231 RS_COLUMN_INVALID, 232 RS_COLUMN_INVALID, 233 }, 234 .checks = { 235 rs_ant_allow, 236 }, 237 }, 238 [RS_COLUMN_LEGACY_ANT_B] = { 239 .mode = RS_LEGACY, 240 .ant = ANT_B, 241 .next_columns = { 242 RS_COLUMN_LEGACY_ANT_A, 243 RS_COLUMN_SISO_ANT_B, 244 RS_COLUMN_MIMO2, 245 RS_COLUMN_INVALID, 246 RS_COLUMN_INVALID, 247 RS_COLUMN_INVALID, 248 RS_COLUMN_INVALID, 249 }, 250 .checks = { 251 rs_ant_allow, 252 }, 253 }, 254 [RS_COLUMN_SISO_ANT_A] = { 255 .mode = RS_SISO, 256 .ant = ANT_A, 257 .next_columns = { 258 RS_COLUMN_SISO_ANT_B, 259 RS_COLUMN_MIMO2, 260 RS_COLUMN_SISO_ANT_A_SGI, 261 RS_COLUMN_LEGACY_ANT_A, 262 RS_COLUMN_LEGACY_ANT_B, 263 RS_COLUMN_INVALID, 264 RS_COLUMN_INVALID, 265 }, 266 .checks = { 267 rs_siso_allow, 268 rs_ant_allow, 269 }, 270 }, 271 [RS_COLUMN_SISO_ANT_B] = { 272 .mode = RS_SISO, 273 .ant = ANT_B, 274 .next_columns = { 275 RS_COLUMN_SISO_ANT_A, 276 RS_COLUMN_MIMO2, 277 RS_COLUMN_SISO_ANT_B_SGI, 278 RS_COLUMN_LEGACY_ANT_A, 279 RS_COLUMN_LEGACY_ANT_B, 280 RS_COLUMN_INVALID, 281 RS_COLUMN_INVALID, 282 }, 283 .checks = { 284 rs_siso_allow, 285 rs_ant_allow, 286 }, 287 }, 288 [RS_COLUMN_SISO_ANT_A_SGI] = { 289 .mode = RS_SISO, 290 .ant = ANT_A, 291 .sgi = true, 292 .next_columns = { 293 RS_COLUMN_SISO_ANT_B_SGI, 294 RS_COLUMN_MIMO2_SGI, 295 RS_COLUMN_SISO_ANT_A, 296 RS_COLUMN_LEGACY_ANT_A, 297 RS_COLUMN_LEGACY_ANT_B, 298 RS_COLUMN_INVALID, 299 RS_COLUMN_INVALID, 300 }, 301 .checks = { 302 rs_siso_allow, 303 rs_ant_allow, 304 rs_sgi_allow, 305 }, 306 }, 307 [RS_COLUMN_SISO_ANT_B_SGI] = { 308 .mode = RS_SISO, 309 .ant = ANT_B, 310 .sgi = true, 311 .next_columns = { 312 RS_COLUMN_SISO_ANT_A_SGI, 313 RS_COLUMN_MIMO2_SGI, 314 RS_COLUMN_SISO_ANT_B, 315 RS_COLUMN_LEGACY_ANT_A, 316 RS_COLUMN_LEGACY_ANT_B, 317 RS_COLUMN_INVALID, 318 RS_COLUMN_INVALID, 319 }, 320 .checks = { 321 rs_siso_allow, 322 rs_ant_allow, 323 rs_sgi_allow, 324 }, 325 }, 326 [RS_COLUMN_MIMO2] = { 327 .mode = RS_MIMO2, 328 .ant = ANT_AB, 329 .next_columns = { 330 RS_COLUMN_SISO_ANT_A, 331 RS_COLUMN_MIMO2_SGI, 332 RS_COLUMN_LEGACY_ANT_A, 333 RS_COLUMN_LEGACY_ANT_B, 334 RS_COLUMN_INVALID, 335 RS_COLUMN_INVALID, 336 RS_COLUMN_INVALID, 337 }, 338 .checks = { 339 rs_mimo_allow, 340 }, 341 }, 342 [RS_COLUMN_MIMO2_SGI] = { 343 .mode = RS_MIMO2, 344 .ant = ANT_AB, 345 .sgi = true, 346 .next_columns = { 347 RS_COLUMN_SISO_ANT_A_SGI, 348 RS_COLUMN_MIMO2, 349 RS_COLUMN_LEGACY_ANT_A, 350 RS_COLUMN_LEGACY_ANT_B, 351 RS_COLUMN_INVALID, 352 RS_COLUMN_INVALID, 353 RS_COLUMN_INVALID, 354 }, 355 .checks = { 356 rs_mimo_allow, 357 rs_sgi_allow, 358 }, 359 }, 360 }; 361 362 static inline u8 rs_extract_rate(u32 rate_n_flags) 363 { 364 /* also works for HT because bits 7:6 are zero there */ 365 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK); 366 } 367 368 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags) 369 { 370 int idx = 0; 371 372 if (rate_n_flags & RATE_MCS_HT_MSK) { 373 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK; 374 idx += IWL_RATE_MCS_0_INDEX; 375 376 /* skip 9M not supported in HT*/ 377 if (idx >= IWL_RATE_9M_INDEX) 378 idx += 1; 379 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE)) 380 return idx; 381 } else if (rate_n_flags & RATE_MCS_VHT_MSK) { 382 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK; 383 idx += IWL_RATE_MCS_0_INDEX; 384 385 /* skip 9M not supported in VHT*/ 386 if (idx >= IWL_RATE_9M_INDEX) 387 idx++; 388 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE)) 389 return idx; 390 } else { 391 /* legacy rate format, search for match in table */ 392 393 u8 legacy_rate = rs_extract_rate(rate_n_flags); 394 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++) 395 if (iwl_rates[idx].plcp == legacy_rate) 396 return idx; 397 } 398 399 return IWL_RATE_INVALID; 400 } 401 402 static void rs_rate_scale_perform(struct iwl_mvm *mvm, 403 struct ieee80211_sta *sta, 404 struct iwl_lq_sta *lq_sta, 405 int tid, bool ndp); 406 static void rs_fill_lq_cmd(struct iwl_mvm *mvm, 407 struct ieee80211_sta *sta, 408 struct iwl_lq_sta *lq_sta, 409 const struct rs_rate *initial_rate); 410 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search); 411 412 /** 413 * The following tables contain the expected throughput metrics for all rates 414 * 415 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits 416 * 417 * where invalid entries are zeros. 418 * 419 * CCK rates are only valid in legacy table and will only be used in G 420 * (2.4 GHz) band. 421 */ 422 423 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = { 424 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0 425 }; 426 427 /* Expected TpT tables. 4 indexes: 428 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI 429 */ 430 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = { 431 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0}, 432 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0}, 433 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0}, 434 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0}, 435 }; 436 437 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = { 438 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275}, 439 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280}, 440 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173}, 441 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284}, 442 }; 443 444 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = { 445 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308}, 446 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312}, 447 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466}, 448 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691}, 449 }; 450 451 static const u16 expected_tpt_siso_160MHz[4][IWL_RATE_COUNT] = { 452 {0, 0, 0, 0, 191, 0, 244, 288, 298, 308, 313, 318, 323, 328, 330}, 453 {0, 0, 0, 0, 200, 0, 251, 293, 302, 312, 317, 322, 327, 332, 334}, 454 {0, 0, 0, 0, 439, 0, 875, 1307, 1736, 2584, 3419, 3831, 4240, 5049, 5581}, 455 {0, 0, 0, 0, 488, 0, 972, 1451, 1925, 2864, 3785, 4240, 4691, 5581, 6165}, 456 }; 457 458 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = { 459 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0}, 460 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0}, 461 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0}, 462 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0}, 463 }; 464 465 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = { 466 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300}, 467 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303}, 468 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053}, 469 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221}, 470 }; 471 472 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = { 473 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319}, 474 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320}, 475 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219}, 476 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545}, 477 }; 478 479 static const u16 expected_tpt_mimo2_160MHz[4][IWL_RATE_COUNT] = { 480 {0, 0, 0, 0, 240, 0, 278, 308, 313, 319, 322, 324, 328, 330, 334}, 481 {0, 0, 0, 0, 247, 0, 282, 310, 315, 320, 323, 325, 329, 332, 338}, 482 {0, 0, 0, 0, 875, 0, 1735, 2582, 3414, 5043, 6619, 7389, 8147, 9629, 10592}, 483 {0, 0, 0, 0, 971, 0, 1925, 2861, 3779, 5574, 7304, 8147, 8976, 10592, 11640}, 484 }; 485 486 /* mbps, mcs */ 487 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = { 488 { "1", "BPSK DSSS"}, 489 { "2", "QPSK DSSS"}, 490 {"5.5", "BPSK CCK"}, 491 { "11", "QPSK CCK"}, 492 { "6", "BPSK 1/2"}, 493 { "9", "BPSK 1/2"}, 494 { "12", "QPSK 1/2"}, 495 { "18", "QPSK 3/4"}, 496 { "24", "16QAM 1/2"}, 497 { "36", "16QAM 3/4"}, 498 { "48", "64QAM 2/3"}, 499 { "54", "64QAM 3/4"}, 500 { "60", "64QAM 5/6"}, 501 }; 502 503 #define MCS_INDEX_PER_STREAM (8) 504 505 static const char *rs_pretty_ant(u8 ant) 506 { 507 static const char * const ant_name[] = { 508 [ANT_NONE] = "None", 509 [ANT_A] = "A", 510 [ANT_B] = "B", 511 [ANT_AB] = "AB", 512 [ANT_C] = "C", 513 [ANT_AC] = "AC", 514 [ANT_BC] = "BC", 515 [ANT_ABC] = "ABC", 516 }; 517 518 if (ant > ANT_ABC) 519 return "UNKNOWN"; 520 521 return ant_name[ant]; 522 } 523 524 static const char *rs_pretty_lq_type(enum iwl_table_type type) 525 { 526 static const char * const lq_types[] = { 527 [LQ_NONE] = "NONE", 528 [LQ_LEGACY_A] = "LEGACY_A", 529 [LQ_LEGACY_G] = "LEGACY_G", 530 [LQ_HT_SISO] = "HT SISO", 531 [LQ_HT_MIMO2] = "HT MIMO", 532 [LQ_VHT_SISO] = "VHT SISO", 533 [LQ_VHT_MIMO2] = "VHT MIMO", 534 }; 535 536 if (type < LQ_NONE || type >= LQ_MAX) 537 return "UNKNOWN"; 538 539 return lq_types[type]; 540 } 541 542 static char *rs_pretty_rate(const struct rs_rate *rate) 543 { 544 static char buf[40]; 545 static const char * const legacy_rates[] = { 546 [IWL_RATE_1M_INDEX] = "1M", 547 [IWL_RATE_2M_INDEX] = "2M", 548 [IWL_RATE_5M_INDEX] = "5.5M", 549 [IWL_RATE_11M_INDEX] = "11M", 550 [IWL_RATE_6M_INDEX] = "6M", 551 [IWL_RATE_9M_INDEX] = "9M", 552 [IWL_RATE_12M_INDEX] = "12M", 553 [IWL_RATE_18M_INDEX] = "18M", 554 [IWL_RATE_24M_INDEX] = "24M", 555 [IWL_RATE_36M_INDEX] = "36M", 556 [IWL_RATE_48M_INDEX] = "48M", 557 [IWL_RATE_54M_INDEX] = "54M", 558 }; 559 static const char *const ht_vht_rates[] = { 560 [IWL_RATE_MCS_0_INDEX] = "MCS0", 561 [IWL_RATE_MCS_1_INDEX] = "MCS1", 562 [IWL_RATE_MCS_2_INDEX] = "MCS2", 563 [IWL_RATE_MCS_3_INDEX] = "MCS3", 564 [IWL_RATE_MCS_4_INDEX] = "MCS4", 565 [IWL_RATE_MCS_5_INDEX] = "MCS5", 566 [IWL_RATE_MCS_6_INDEX] = "MCS6", 567 [IWL_RATE_MCS_7_INDEX] = "MCS7", 568 [IWL_RATE_MCS_8_INDEX] = "MCS8", 569 [IWL_RATE_MCS_9_INDEX] = "MCS9", 570 }; 571 const char *rate_str; 572 573 if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX)) 574 rate_str = legacy_rates[rate->index]; 575 else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) && 576 (rate->index >= IWL_RATE_MCS_0_INDEX) && 577 (rate->index <= IWL_RATE_MCS_9_INDEX)) 578 rate_str = ht_vht_rates[rate->index]; 579 else 580 rate_str = "BAD_RATE"; 581 582 sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type), 583 rs_pretty_ant(rate->ant), rate_str); 584 return buf; 585 } 586 587 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate, 588 const char *prefix) 589 { 590 IWL_DEBUG_RATE(mvm, 591 "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n", 592 prefix, rs_pretty_rate(rate), rate->bw, 593 rate->sgi, rate->ldpc, rate->stbc); 594 } 595 596 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window) 597 { 598 window->data = 0; 599 window->success_counter = 0; 600 window->success_ratio = IWL_INVALID_VALUE; 601 window->counter = 0; 602 window->average_tpt = IWL_INVALID_VALUE; 603 } 604 605 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm, 606 struct iwl_scale_tbl_info *tbl) 607 { 608 int i; 609 610 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n"); 611 for (i = 0; i < IWL_RATE_COUNT; i++) 612 rs_rate_scale_clear_window(&tbl->win[i]); 613 614 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++) 615 rs_rate_scale_clear_window(&tbl->tpc_win[i]); 616 } 617 618 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type) 619 { 620 return (ant_type & valid_antenna) == ant_type; 621 } 622 623 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm, 624 struct iwl_lq_sta *lq_data, u8 tid, 625 struct ieee80211_sta *sta) 626 { 627 int ret = -EAGAIN; 628 629 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n", 630 sta->addr, tid); 631 ret = ieee80211_start_tx_ba_session(sta, tid, 5000); 632 if (ret == -EAGAIN) { 633 /* 634 * driver and mac80211 is out of sync 635 * this might be cause by reloading firmware 636 * stop the tx ba session here 637 */ 638 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n", 639 tid); 640 ieee80211_stop_tx_ba_session(sta, tid); 641 } 642 return ret; 643 } 644 645 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid, 646 struct iwl_lq_sta *lq_data, 647 struct ieee80211_sta *sta) 648 { 649 if (tid < IWL_MAX_TID_COUNT) 650 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta); 651 else 652 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n", 653 tid, IWL_MAX_TID_COUNT); 654 } 655 656 static inline int get_num_of_ant_from_rate(u32 rate_n_flags) 657 { 658 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) + 659 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) + 660 !!(rate_n_flags & RATE_MCS_ANT_C_MSK); 661 } 662 663 /* 664 * Static function to get the expected throughput from an iwl_scale_tbl_info 665 * that wraps a NULL pointer check 666 */ 667 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index) 668 { 669 if (tbl->expected_tpt) 670 return tbl->expected_tpt[rs_index]; 671 return 0; 672 } 673 674 /** 675 * rs_collect_tx_data - Update the success/failure sliding window 676 * 677 * We keep a sliding window of the last 62 packets transmitted 678 * at this rate. window->data contains the bitmask of successful 679 * packets. 680 */ 681 static int _rs_collect_tx_data(struct iwl_mvm *mvm, 682 struct iwl_scale_tbl_info *tbl, 683 int scale_index, int attempts, int successes, 684 struct iwl_rate_scale_data *window) 685 { 686 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1)); 687 s32 fail_count, tpt; 688 689 /* Get expected throughput */ 690 tpt = get_expected_tpt(tbl, scale_index); 691 692 /* 693 * Keep track of only the latest 62 tx frame attempts in this rate's 694 * history window; anything older isn't really relevant any more. 695 * If we have filled up the sliding window, drop the oldest attempt; 696 * if the oldest attempt (highest bit in bitmap) shows "success", 697 * subtract "1" from the success counter (this is the main reason 698 * we keep these bitmaps!). 699 */ 700 while (attempts > 0) { 701 if (window->counter >= IWL_RATE_MAX_WINDOW) { 702 /* remove earliest */ 703 window->counter = IWL_RATE_MAX_WINDOW - 1; 704 705 if (window->data & mask) { 706 window->data &= ~mask; 707 window->success_counter--; 708 } 709 } 710 711 /* Increment frames-attempted counter */ 712 window->counter++; 713 714 /* Shift bitmap by one frame to throw away oldest history */ 715 window->data <<= 1; 716 717 /* Mark the most recent #successes attempts as successful */ 718 if (successes > 0) { 719 window->success_counter++; 720 window->data |= 0x1; 721 successes--; 722 } 723 724 attempts--; 725 } 726 727 /* Calculate current success ratio, avoid divide-by-0! */ 728 if (window->counter > 0) 729 window->success_ratio = 128 * (100 * window->success_counter) 730 / window->counter; 731 else 732 window->success_ratio = IWL_INVALID_VALUE; 733 734 fail_count = window->counter - window->success_counter; 735 736 /* Calculate average throughput, if we have enough history. */ 737 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) || 738 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) 739 window->average_tpt = (window->success_ratio * tpt + 64) / 128; 740 else 741 window->average_tpt = IWL_INVALID_VALUE; 742 743 return 0; 744 } 745 746 static int rs_collect_tpc_data(struct iwl_mvm *mvm, 747 struct iwl_lq_sta *lq_sta, 748 struct iwl_scale_tbl_info *tbl, 749 int scale_index, int attempts, int successes, 750 u8 reduced_txp) 751 { 752 struct iwl_rate_scale_data *window = NULL; 753 754 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION)) 755 return -EINVAL; 756 757 window = &tbl->tpc_win[reduced_txp]; 758 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes, 759 window); 760 } 761 762 static int rs_collect_tlc_data(struct iwl_mvm *mvm, 763 struct iwl_lq_sta *lq_sta, 764 struct iwl_scale_tbl_info *tbl, 765 int scale_index, int attempts, int successes) 766 { 767 struct iwl_rate_scale_data *window = NULL; 768 769 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT) 770 return -EINVAL; 771 772 if (tbl->column != RS_COLUMN_INVALID) { 773 struct lq_sta_pers *pers = &lq_sta->pers; 774 775 pers->tx_stats[tbl->column][scale_index].total += attempts; 776 pers->tx_stats[tbl->column][scale_index].success += successes; 777 } 778 779 /* Select window for current tx bit rate */ 780 window = &(tbl->win[scale_index]); 781 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes, 782 window); 783 } 784 785 /* Convert rs_rate object into ucode rate bitmask */ 786 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm, 787 struct rs_rate *rate) 788 { 789 u32 ucode_rate = 0; 790 int index = rate->index; 791 792 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) & 793 RATE_MCS_ANT_ABC_MSK); 794 795 if (is_legacy(rate)) { 796 ucode_rate |= iwl_rates[index].plcp; 797 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE) 798 ucode_rate |= RATE_MCS_CCK_MSK; 799 return ucode_rate; 800 } 801 802 if (is_ht(rate)) { 803 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) { 804 IWL_ERR(mvm, "Invalid HT rate index %d\n", index); 805 index = IWL_LAST_HT_RATE; 806 } 807 ucode_rate |= RATE_MCS_HT_MSK; 808 809 if (is_ht_siso(rate)) 810 ucode_rate |= iwl_rates[index].plcp_ht_siso; 811 else if (is_ht_mimo2(rate)) 812 ucode_rate |= iwl_rates[index].plcp_ht_mimo2; 813 else 814 WARN_ON_ONCE(1); 815 } else if (is_vht(rate)) { 816 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) { 817 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index); 818 index = IWL_LAST_VHT_RATE; 819 } 820 ucode_rate |= RATE_MCS_VHT_MSK; 821 if (is_vht_siso(rate)) 822 ucode_rate |= iwl_rates[index].plcp_vht_siso; 823 else if (is_vht_mimo2(rate)) 824 ucode_rate |= iwl_rates[index].plcp_vht_mimo2; 825 else 826 WARN_ON_ONCE(1); 827 828 } else { 829 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type); 830 } 831 832 if (is_siso(rate) && rate->stbc) { 833 /* To enable STBC we need to set both a flag and ANT_AB */ 834 ucode_rate |= RATE_MCS_ANT_AB_MSK; 835 ucode_rate |= RATE_MCS_VHT_STBC_MSK; 836 } 837 838 ucode_rate |= rate->bw; 839 if (rate->sgi) 840 ucode_rate |= RATE_MCS_SGI_MSK; 841 if (rate->ldpc) 842 ucode_rate |= RATE_MCS_LDPC_MSK; 843 844 return ucode_rate; 845 } 846 847 /* Convert a ucode rate into an rs_rate object */ 848 static int rs_rate_from_ucode_rate(const u32 ucode_rate, 849 enum nl80211_band band, 850 struct rs_rate *rate) 851 { 852 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK; 853 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate); 854 u8 nss; 855 856 memset(rate, 0, sizeof(*rate)); 857 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate); 858 859 if (rate->index == IWL_RATE_INVALID) 860 return -EINVAL; 861 862 rate->ant = (ant_msk >> RATE_MCS_ANT_POS); 863 864 /* Legacy */ 865 if (!(ucode_rate & RATE_MCS_HT_MSK) && 866 !(ucode_rate & RATE_MCS_VHT_MSK)) { 867 if (num_of_ant == 1) { 868 if (band == NL80211_BAND_5GHZ) 869 rate->type = LQ_LEGACY_A; 870 else 871 rate->type = LQ_LEGACY_G; 872 } 873 874 return 0; 875 } 876 877 /* HT or VHT */ 878 if (ucode_rate & RATE_MCS_SGI_MSK) 879 rate->sgi = true; 880 if (ucode_rate & RATE_MCS_LDPC_MSK) 881 rate->ldpc = true; 882 if (ucode_rate & RATE_MCS_VHT_STBC_MSK) 883 rate->stbc = true; 884 if (ucode_rate & RATE_MCS_BF_MSK) 885 rate->bfer = true; 886 887 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK; 888 889 if (ucode_rate & RATE_MCS_HT_MSK) { 890 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >> 891 RATE_HT_MCS_NSS_POS) + 1; 892 893 if (nss == 1) { 894 rate->type = LQ_HT_SISO; 895 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 896 "stbc %d bfer %d", 897 rate->stbc, rate->bfer); 898 } else if (nss == 2) { 899 rate->type = LQ_HT_MIMO2; 900 WARN_ON_ONCE(num_of_ant != 2); 901 } else { 902 WARN_ON_ONCE(1); 903 } 904 } else if (ucode_rate & RATE_MCS_VHT_MSK) { 905 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >> 906 RATE_VHT_MCS_NSS_POS) + 1; 907 908 if (nss == 1) { 909 rate->type = LQ_VHT_SISO; 910 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 911 "stbc %d bfer %d", 912 rate->stbc, rate->bfer); 913 } else if (nss == 2) { 914 rate->type = LQ_VHT_MIMO2; 915 WARN_ON_ONCE(num_of_ant != 2); 916 } else { 917 WARN_ON_ONCE(1); 918 } 919 } 920 921 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 && 922 !is_vht(rate)); 923 924 return 0; 925 } 926 927 /* switch to another antenna/antennas and return 1 */ 928 /* if no other valid antenna found, return 0 */ 929 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate) 930 { 931 u8 new_ant_type; 932 933 if (!rate->ant || rate->ant > ANT_ABC) 934 return 0; 935 936 if (!rs_is_valid_ant(valid_ant, rate->ant)) 937 return 0; 938 939 new_ant_type = ant_toggle_lookup[rate->ant]; 940 941 while ((new_ant_type != rate->ant) && 942 !rs_is_valid_ant(valid_ant, new_ant_type)) 943 new_ant_type = ant_toggle_lookup[new_ant_type]; 944 945 if (new_ant_type == rate->ant) 946 return 0; 947 948 rate->ant = new_ant_type; 949 950 return 1; 951 } 952 953 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta, 954 struct rs_rate *rate) 955 { 956 if (is_legacy(rate)) 957 return lq_sta->active_legacy_rate; 958 else if (is_siso(rate)) 959 return lq_sta->active_siso_rate; 960 else if (is_mimo2(rate)) 961 return lq_sta->active_mimo2_rate; 962 963 WARN_ON_ONCE(1); 964 return 0; 965 } 966 967 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask, 968 int rate_type) 969 { 970 u8 high = IWL_RATE_INVALID; 971 u8 low = IWL_RATE_INVALID; 972 973 /* 802.11A or ht walks to the next literal adjacent rate in 974 * the rate table */ 975 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) { 976 int i; 977 u32 mask; 978 979 /* Find the previous rate that is in the rate mask */ 980 i = index - 1; 981 for (mask = (1 << i); i >= 0; i--, mask >>= 1) { 982 if (rate_mask & mask) { 983 low = i; 984 break; 985 } 986 } 987 988 /* Find the next rate that is in the rate mask */ 989 i = index + 1; 990 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) { 991 if (rate_mask & mask) { 992 high = i; 993 break; 994 } 995 } 996 997 return (high << 8) | low; 998 } 999 1000 low = index; 1001 while (low != IWL_RATE_INVALID) { 1002 low = iwl_rates[low].prev_rs; 1003 if (low == IWL_RATE_INVALID) 1004 break; 1005 if (rate_mask & (1 << low)) 1006 break; 1007 } 1008 1009 high = index; 1010 while (high != IWL_RATE_INVALID) { 1011 high = iwl_rates[high].next_rs; 1012 if (high == IWL_RATE_INVALID) 1013 break; 1014 if (rate_mask & (1 << high)) 1015 break; 1016 } 1017 1018 return (high << 8) | low; 1019 } 1020 1021 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta, 1022 struct rs_rate *rate) 1023 { 1024 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate); 1025 } 1026 1027 /* Get the next supported lower rate in the current column. 1028 * Return true if bottom rate in the current column was reached 1029 */ 1030 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta, 1031 struct rs_rate *rate) 1032 { 1033 u8 low; 1034 u16 high_low; 1035 u16 rate_mask; 1036 struct iwl_mvm *mvm = lq_sta->pers.drv; 1037 1038 rate_mask = rs_get_supported_rates(lq_sta, rate); 1039 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask, 1040 rate->type); 1041 low = high_low & 0xff; 1042 1043 /* Bottom rate of column reached */ 1044 if (low == IWL_RATE_INVALID) 1045 return true; 1046 1047 rate->index = low; 1048 return false; 1049 } 1050 1051 /* Get the next rate to use following a column downgrade */ 1052 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta, 1053 struct rs_rate *rate) 1054 { 1055 struct iwl_mvm *mvm = lq_sta->pers.drv; 1056 1057 if (is_legacy(rate)) { 1058 /* No column to downgrade from Legacy */ 1059 return; 1060 } else if (is_siso(rate)) { 1061 /* Downgrade to Legacy if we were in SISO */ 1062 if (lq_sta->band == NL80211_BAND_5GHZ) 1063 rate->type = LQ_LEGACY_A; 1064 else 1065 rate->type = LQ_LEGACY_G; 1066 1067 rate->bw = RATE_MCS_CHAN_WIDTH_20; 1068 1069 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX || 1070 rate->index > IWL_RATE_MCS_9_INDEX); 1071 1072 rate->index = rs_ht_to_legacy[rate->index]; 1073 rate->ldpc = false; 1074 } else { 1075 /* Downgrade to SISO with same MCS if in MIMO */ 1076 rate->type = is_vht_mimo2(rate) ? 1077 LQ_VHT_SISO : LQ_HT_SISO; 1078 } 1079 1080 if (num_of_ant(rate->ant) > 1) 1081 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm)); 1082 1083 /* Relevant in both switching to SISO or Legacy */ 1084 rate->sgi = false; 1085 1086 if (!rs_rate_supported(lq_sta, rate)) 1087 rs_get_lower_rate_in_column(lq_sta, rate); 1088 } 1089 1090 /* Check if both rates are identical 1091 * allow_ant_mismatch enables matching a SISO rate on ANT_A or ANT_B 1092 * with a rate indicating STBC/BFER and ANT_AB. 1093 */ 1094 static inline bool rs_rate_equal(struct rs_rate *a, 1095 struct rs_rate *b, 1096 bool allow_ant_mismatch) 1097 1098 { 1099 bool ant_match = (a->ant == b->ant) && (a->stbc == b->stbc) && 1100 (a->bfer == b->bfer); 1101 1102 if (allow_ant_mismatch) { 1103 if (a->stbc || a->bfer) { 1104 WARN_ONCE(a->ant != ANT_AB, "stbc %d bfer %d ant %d", 1105 a->stbc, a->bfer, a->ant); 1106 ant_match |= (b->ant == ANT_A || b->ant == ANT_B); 1107 } else if (b->stbc || b->bfer) { 1108 WARN_ONCE(b->ant != ANT_AB, "stbc %d bfer %d ant %d", 1109 b->stbc, b->bfer, b->ant); 1110 ant_match |= (a->ant == ANT_A || a->ant == ANT_B); 1111 } 1112 } 1113 1114 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) && 1115 (a->ldpc == b->ldpc) && (a->index == b->index) && ant_match; 1116 } 1117 1118 /* Check if both rates share the same column */ 1119 static inline bool rs_rate_column_match(struct rs_rate *a, 1120 struct rs_rate *b) 1121 { 1122 bool ant_match; 1123 1124 if (a->stbc || a->bfer) 1125 ant_match = (b->ant == ANT_A || b->ant == ANT_B); 1126 else 1127 ant_match = (a->ant == b->ant); 1128 1129 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) 1130 && ant_match; 1131 } 1132 1133 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate) 1134 { 1135 if (is_legacy(rate)) { 1136 if (rate->ant == ANT_A) 1137 return RS_COLUMN_LEGACY_ANT_A; 1138 1139 if (rate->ant == ANT_B) 1140 return RS_COLUMN_LEGACY_ANT_B; 1141 1142 goto err; 1143 } 1144 1145 if (is_siso(rate)) { 1146 if (rate->ant == ANT_A || rate->stbc || rate->bfer) 1147 return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI : 1148 RS_COLUMN_SISO_ANT_A; 1149 1150 if (rate->ant == ANT_B) 1151 return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI : 1152 RS_COLUMN_SISO_ANT_B; 1153 1154 goto err; 1155 } 1156 1157 if (is_mimo(rate)) 1158 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2; 1159 1160 err: 1161 return RS_COLUMN_INVALID; 1162 } 1163 1164 static u8 rs_get_tid(struct ieee80211_hdr *hdr) 1165 { 1166 u8 tid = IWL_MAX_TID_COUNT; 1167 1168 if (ieee80211_is_data_qos(hdr->frame_control)) { 1169 u8 *qc = ieee80211_get_qos_ctl(hdr); 1170 tid = qc[0] & 0xf; 1171 } 1172 1173 if (unlikely(tid > IWL_MAX_TID_COUNT)) 1174 tid = IWL_MAX_TID_COUNT; 1175 1176 return tid; 1177 } 1178 1179 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1180 int tid, struct ieee80211_tx_info *info, bool ndp) 1181 { 1182 int legacy_success; 1183 int retries; 1184 int i; 1185 struct iwl_lq_cmd *table; 1186 u32 lq_hwrate; 1187 struct rs_rate lq_rate, tx_resp_rate; 1188 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl; 1189 u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0]; 1190 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1]; 1191 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 1192 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta; 1193 bool allow_ant_mismatch = fw_has_api(&mvm->fw->ucode_capa, 1194 IWL_UCODE_TLV_API_LQ_SS_PARAMS); 1195 1196 /* Treat uninitialized rate scaling data same as non-existing. */ 1197 if (!lq_sta) { 1198 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n"); 1199 return; 1200 } else if (!lq_sta->pers.drv) { 1201 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n"); 1202 return; 1203 } 1204 1205 /* This packet was aggregated but doesn't carry status info */ 1206 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 1207 !(info->flags & IEEE80211_TX_STAT_AMPDU)) 1208 return; 1209 1210 rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate); 1211 1212 #ifdef CONFIG_MAC80211_DEBUGFS 1213 /* Disable last tx check if we are debugging with fixed rate but 1214 * update tx stats */ 1215 if (lq_sta->pers.dbg_fixed_rate) { 1216 int index = tx_resp_rate.index; 1217 enum rs_column column; 1218 int attempts, success; 1219 1220 column = rs_get_column_from_rate(&tx_resp_rate); 1221 if (WARN_ONCE(column == RS_COLUMN_INVALID, 1222 "Can't map rate 0x%x to column", 1223 tx_resp_hwrate)) 1224 return; 1225 1226 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 1227 attempts = info->status.ampdu_len; 1228 success = info->status.ampdu_ack_len; 1229 } else { 1230 attempts = info->status.rates[0].count; 1231 success = !!(info->flags & IEEE80211_TX_STAT_ACK); 1232 } 1233 1234 lq_sta->pers.tx_stats[column][index].total += attempts; 1235 lq_sta->pers.tx_stats[column][index].success += success; 1236 1237 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n", 1238 tx_resp_hwrate, success, attempts); 1239 return; 1240 } 1241 #endif 1242 1243 if (time_after(jiffies, 1244 (unsigned long)(lq_sta->last_tx + 1245 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) { 1246 int t; 1247 1248 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n"); 1249 for (t = 0; t < IWL_MAX_TID_COUNT; t++) 1250 ieee80211_stop_tx_ba_session(sta, t); 1251 1252 iwl_mvm_rs_rate_init(mvm, sta, info->band, false); 1253 return; 1254 } 1255 lq_sta->last_tx = jiffies; 1256 1257 /* Ignore this Tx frame response if its initial rate doesn't match 1258 * that of latest Link Quality command. There may be stragglers 1259 * from a previous Link Quality command, but we're no longer interested 1260 * in those; they're either from the "active" mode while we're trying 1261 * to check "search" mode, or a prior "search" mode after we've moved 1262 * to a new "search" mode (which might become the new "active" mode). 1263 */ 1264 table = &lq_sta->lq; 1265 lq_hwrate = le32_to_cpu(table->rs_table[0]); 1266 rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate); 1267 1268 /* Here we actually compare this rate to the latest LQ command */ 1269 if (!rs_rate_equal(&tx_resp_rate, &lq_rate, allow_ant_mismatch)) { 1270 IWL_DEBUG_RATE(mvm, 1271 "initial tx resp rate 0x%x does not match 0x%x\n", 1272 tx_resp_hwrate, lq_hwrate); 1273 1274 /* 1275 * Since rates mis-match, the last LQ command may have failed. 1276 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with 1277 * ... driver. 1278 */ 1279 lq_sta->missed_rate_counter++; 1280 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) { 1281 lq_sta->missed_rate_counter = 0; 1282 IWL_DEBUG_RATE(mvm, 1283 "Too many rates mismatch. Send sync LQ. rs_state %d\n", 1284 lq_sta->rs_state); 1285 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false); 1286 } 1287 /* Regardless, ignore this status info for outdated rate */ 1288 return; 1289 } else 1290 /* Rate did match, so reset the missed_rate_counter */ 1291 lq_sta->missed_rate_counter = 0; 1292 1293 if (!lq_sta->search_better_tbl) { 1294 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1295 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1296 } else { 1297 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1298 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1299 } 1300 1301 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) { 1302 IWL_DEBUG_RATE(mvm, 1303 "Neither active nor search matches tx rate\n"); 1304 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1305 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE"); 1306 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1307 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH"); 1308 rs_dump_rate(mvm, &lq_rate, "ACTUAL"); 1309 1310 /* 1311 * no matching table found, let's by-pass the data collection 1312 * and continue to perform rate scale to find the rate table 1313 */ 1314 rs_stay_in_table(lq_sta, true); 1315 goto done; 1316 } 1317 1318 /* 1319 * Updating the frame history depends on whether packets were 1320 * aggregated. 1321 * 1322 * For aggregation, all packets were transmitted at the same rate, the 1323 * first index into rate scale table. 1324 */ 1325 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 1326 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, lq_rate.index, 1327 info->status.ampdu_len, 1328 info->status.ampdu_ack_len, 1329 reduced_txp); 1330 1331 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat 1332 * it as a single frame loss as we don't want the success ratio 1333 * to dip too quickly because a BA wasn't received. 1334 * For TPC, there's no need for this optimisation since we want 1335 * to recover very quickly from a bad power reduction and, 1336 * therefore we'd like the success ratio to get an immediate hit 1337 * when failing to get a BA, so we'd switch back to a lower or 1338 * zero power reduction. When FW transmits agg with a rate 1339 * different from the initial rate, it will not use reduced txp 1340 * and will send BA notification twice (one empty with reduced 1341 * txp equal to the value from LQ and one with reduced txp 0). 1342 * We need to update counters for each txp level accordingly. 1343 */ 1344 if (info->status.ampdu_ack_len == 0) 1345 info->status.ampdu_len = 1; 1346 1347 rs_collect_tlc_data(mvm, lq_sta, curr_tbl, lq_rate.index, 1348 info->status.ampdu_len, 1349 info->status.ampdu_ack_len); 1350 1351 /* Update success/fail counts if not searching for new mode */ 1352 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1353 lq_sta->total_success += info->status.ampdu_ack_len; 1354 lq_sta->total_failed += (info->status.ampdu_len - 1355 info->status.ampdu_ack_len); 1356 } 1357 } else { 1358 /* For legacy, update frame history with for each Tx retry. */ 1359 retries = info->status.rates[0].count - 1; 1360 /* HW doesn't send more than 15 retries */ 1361 retries = min(retries, 15); 1362 1363 /* The last transmission may have been successful */ 1364 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK); 1365 /* Collect data for each rate used during failed TX attempts */ 1366 for (i = 0; i <= retries; ++i) { 1367 lq_hwrate = le32_to_cpu(table->rs_table[i]); 1368 rs_rate_from_ucode_rate(lq_hwrate, info->band, 1369 &lq_rate); 1370 /* 1371 * Only collect stats if retried rate is in the same RS 1372 * table as active/search. 1373 */ 1374 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate)) 1375 tmp_tbl = curr_tbl; 1376 else if (rs_rate_column_match(&lq_rate, 1377 &other_tbl->rate)) 1378 tmp_tbl = other_tbl; 1379 else 1380 continue; 1381 1382 rs_collect_tpc_data(mvm, lq_sta, tmp_tbl, 1383 lq_rate.index, 1, 1384 i < retries ? 0 : legacy_success, 1385 reduced_txp); 1386 rs_collect_tlc_data(mvm, lq_sta, tmp_tbl, 1387 lq_rate.index, 1, 1388 i < retries ? 0 : legacy_success); 1389 } 1390 1391 /* Update success/fail counts if not searching for new mode */ 1392 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1393 lq_sta->total_success += legacy_success; 1394 lq_sta->total_failed += retries + (1 - legacy_success); 1395 } 1396 } 1397 /* The last TX rate is cached in lq_sta; it's set in if/else above */ 1398 lq_sta->last_rate_n_flags = lq_hwrate; 1399 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp); 1400 done: 1401 /* See if there's a better rate or modulation mode to try. */ 1402 if (sta->supp_rates[info->band]) 1403 rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp); 1404 } 1405 1406 /* 1407 * mac80211 sends us Tx status 1408 */ 1409 static void rs_mac80211_tx_status(void *mvm_r, 1410 struct ieee80211_supported_band *sband, 1411 struct ieee80211_sta *sta, void *priv_sta, 1412 struct sk_buff *skb) 1413 { 1414 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1415 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r; 1416 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 1417 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1418 1419 if (!iwl_mvm_sta_from_mac80211(sta)->vif) 1420 return; 1421 1422 if (!ieee80211_is_data(hdr->frame_control) || 1423 info->flags & IEEE80211_TX_CTL_NO_ACK) 1424 return; 1425 1426 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info, 1427 ieee80211_is_qos_nullfunc(hdr->frame_control)); 1428 } 1429 1430 /* 1431 * Begin a period of staying with a selected modulation mode. 1432 * Set "stay_in_tbl" flag to prevent any mode switches. 1433 * Set frame tx success limits according to legacy vs. high-throughput, 1434 * and reset overall (spanning all rates) tx success history statistics. 1435 * These control how long we stay using same modulation mode before 1436 * searching for a new mode. 1437 */ 1438 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy, 1439 struct iwl_lq_sta *lq_sta) 1440 { 1441 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n"); 1442 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN; 1443 if (is_legacy) { 1444 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT; 1445 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT; 1446 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT; 1447 } else { 1448 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT; 1449 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT; 1450 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT; 1451 } 1452 lq_sta->table_count = 0; 1453 lq_sta->total_failed = 0; 1454 lq_sta->total_success = 0; 1455 lq_sta->flush_timer = jiffies; 1456 lq_sta->visited_columns = 0; 1457 } 1458 1459 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask) 1460 { 1461 if (rate_mask) 1462 return find_last_bit(&rate_mask, BITS_PER_LONG); 1463 return IWL_RATE_INVALID; 1464 } 1465 1466 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta, 1467 const struct rs_tx_column *column) 1468 { 1469 switch (column->mode) { 1470 case RS_LEGACY: 1471 return lq_sta->max_legacy_rate_idx; 1472 case RS_SISO: 1473 return lq_sta->max_siso_rate_idx; 1474 case RS_MIMO2: 1475 return lq_sta->max_mimo2_rate_idx; 1476 default: 1477 WARN_ON_ONCE(1); 1478 } 1479 1480 return lq_sta->max_legacy_rate_idx; 1481 } 1482 1483 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1484 const struct rs_tx_column *column, 1485 u32 bw) 1486 { 1487 /* Used to choose among HT tables */ 1488 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT]; 1489 1490 if (WARN_ON_ONCE(column->mode != RS_LEGACY && 1491 column->mode != RS_SISO && 1492 column->mode != RS_MIMO2)) 1493 return expected_tpt_legacy; 1494 1495 /* Legacy rates have only one table */ 1496 if (column->mode == RS_LEGACY) 1497 return expected_tpt_legacy; 1498 1499 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1500 /* Choose among many HT tables depending on number of streams 1501 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation 1502 * status */ 1503 if (column->mode == RS_SISO) { 1504 switch (bw) { 1505 case RATE_MCS_CHAN_WIDTH_20: 1506 ht_tbl_pointer = expected_tpt_siso_20MHz; 1507 break; 1508 case RATE_MCS_CHAN_WIDTH_40: 1509 ht_tbl_pointer = expected_tpt_siso_40MHz; 1510 break; 1511 case RATE_MCS_CHAN_WIDTH_80: 1512 ht_tbl_pointer = expected_tpt_siso_80MHz; 1513 break; 1514 case RATE_MCS_CHAN_WIDTH_160: 1515 ht_tbl_pointer = expected_tpt_siso_160MHz; 1516 break; 1517 default: 1518 WARN_ON_ONCE(1); 1519 } 1520 } else if (column->mode == RS_MIMO2) { 1521 switch (bw) { 1522 case RATE_MCS_CHAN_WIDTH_20: 1523 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1524 break; 1525 case RATE_MCS_CHAN_WIDTH_40: 1526 ht_tbl_pointer = expected_tpt_mimo2_40MHz; 1527 break; 1528 case RATE_MCS_CHAN_WIDTH_80: 1529 ht_tbl_pointer = expected_tpt_mimo2_80MHz; 1530 break; 1531 case RATE_MCS_CHAN_WIDTH_160: 1532 ht_tbl_pointer = expected_tpt_mimo2_160MHz; 1533 break; 1534 default: 1535 WARN_ON_ONCE(1); 1536 } 1537 } else { 1538 WARN_ON_ONCE(1); 1539 } 1540 1541 if (!column->sgi && !lq_sta->is_agg) /* Normal */ 1542 return ht_tbl_pointer[0]; 1543 else if (column->sgi && !lq_sta->is_agg) /* SGI */ 1544 return ht_tbl_pointer[1]; 1545 else if (!column->sgi && lq_sta->is_agg) /* AGG */ 1546 return ht_tbl_pointer[2]; 1547 else /* AGG+SGI */ 1548 return ht_tbl_pointer[3]; 1549 } 1550 1551 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1552 struct iwl_scale_tbl_info *tbl) 1553 { 1554 struct rs_rate *rate = &tbl->rate; 1555 const struct rs_tx_column *column = &rs_tx_columns[tbl->column]; 1556 1557 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw); 1558 } 1559 1560 static s32 rs_get_best_rate(struct iwl_mvm *mvm, 1561 struct iwl_lq_sta *lq_sta, 1562 struct iwl_scale_tbl_info *tbl, /* "search" */ 1563 unsigned long rate_mask, s8 index) 1564 { 1565 struct iwl_scale_tbl_info *active_tbl = 1566 &(lq_sta->lq_info[lq_sta->active_tbl]); 1567 s32 success_ratio = active_tbl->win[index].success_ratio; 1568 u16 expected_current_tpt = active_tbl->expected_tpt[index]; 1569 const u16 *tpt_tbl = tbl->expected_tpt; 1570 u16 high_low; 1571 u32 target_tpt; 1572 int rate_idx; 1573 1574 if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { 1575 target_tpt = 100 * expected_current_tpt; 1576 IWL_DEBUG_RATE(mvm, 1577 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n", 1578 success_ratio, target_tpt); 1579 } else { 1580 target_tpt = lq_sta->last_tpt; 1581 IWL_DEBUG_RATE(mvm, 1582 "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n", 1583 success_ratio, target_tpt); 1584 } 1585 1586 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG); 1587 1588 while (rate_idx != IWL_RATE_INVALID) { 1589 if (target_tpt < (100 * tpt_tbl[rate_idx])) 1590 break; 1591 1592 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask, 1593 tbl->rate.type); 1594 1595 rate_idx = (high_low >> 8) & 0xff; 1596 } 1597 1598 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n", 1599 rate_idx, target_tpt, 1600 rate_idx != IWL_RATE_INVALID ? 1601 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE); 1602 1603 return rate_idx; 1604 } 1605 1606 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta) 1607 { 1608 switch (sta->bandwidth) { 1609 case IEEE80211_STA_RX_BW_160: 1610 return RATE_MCS_CHAN_WIDTH_160; 1611 case IEEE80211_STA_RX_BW_80: 1612 return RATE_MCS_CHAN_WIDTH_80; 1613 case IEEE80211_STA_RX_BW_40: 1614 return RATE_MCS_CHAN_WIDTH_40; 1615 case IEEE80211_STA_RX_BW_20: 1616 default: 1617 return RATE_MCS_CHAN_WIDTH_20; 1618 } 1619 } 1620 1621 /* 1622 * Check whether we should continue using same modulation mode, or 1623 * begin search for a new mode, based on: 1624 * 1) # tx successes or failures while using this mode 1625 * 2) # times calling this function 1626 * 3) elapsed time in this mode (not used, for now) 1627 */ 1628 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search) 1629 { 1630 struct iwl_scale_tbl_info *tbl; 1631 int active_tbl; 1632 int flush_interval_passed = 0; 1633 struct iwl_mvm *mvm; 1634 1635 mvm = lq_sta->pers.drv; 1636 active_tbl = lq_sta->active_tbl; 1637 1638 tbl = &(lq_sta->lq_info[active_tbl]); 1639 1640 /* If we've been disallowing search, see if we should now allow it */ 1641 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1642 /* Elapsed time using current modulation mode */ 1643 if (lq_sta->flush_timer) 1644 flush_interval_passed = 1645 time_after(jiffies, 1646 (unsigned long)(lq_sta->flush_timer + 1647 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ))); 1648 1649 /* 1650 * Check if we should allow search for new modulation mode. 1651 * If many frames have failed or succeeded, or we've used 1652 * this same modulation for a long time, allow search, and 1653 * reset history stats that keep track of whether we should 1654 * allow a new search. Also (below) reset all bitmaps and 1655 * stats in active history. 1656 */ 1657 if (force_search || 1658 (lq_sta->total_failed > lq_sta->max_failure_limit) || 1659 (lq_sta->total_success > lq_sta->max_success_limit) || 1660 ((!lq_sta->search_better_tbl) && 1661 (lq_sta->flush_timer) && (flush_interval_passed))) { 1662 IWL_DEBUG_RATE(mvm, 1663 "LQ: stay is expired %d %d %d\n", 1664 lq_sta->total_failed, 1665 lq_sta->total_success, 1666 flush_interval_passed); 1667 1668 /* Allow search for new mode */ 1669 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED; 1670 IWL_DEBUG_RATE(mvm, 1671 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n"); 1672 lq_sta->total_failed = 0; 1673 lq_sta->total_success = 0; 1674 lq_sta->flush_timer = 0; 1675 /* mark the current column as visited */ 1676 lq_sta->visited_columns = BIT(tbl->column); 1677 /* 1678 * Else if we've used this modulation mode enough repetitions 1679 * (regardless of elapsed time or success/failure), reset 1680 * history bitmaps and rate-specific stats for all rates in 1681 * active table. 1682 */ 1683 } else { 1684 lq_sta->table_count++; 1685 if (lq_sta->table_count >= 1686 lq_sta->table_count_limit) { 1687 lq_sta->table_count = 0; 1688 1689 IWL_DEBUG_RATE(mvm, 1690 "LQ: stay in table clear win\n"); 1691 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1692 } 1693 } 1694 1695 /* If transitioning to allow "search", reset all history 1696 * bitmaps and stats in active table (this will become the new 1697 * "search" table). */ 1698 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) { 1699 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1700 } 1701 } 1702 } 1703 1704 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1705 struct iwl_scale_tbl_info *tbl, 1706 enum rs_action scale_action) 1707 { 1708 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta); 1709 1710 if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) || 1711 tbl->rate.index < IWL_RATE_MCS_5_INDEX || 1712 scale_action == RS_ACTION_DOWNSCALE) 1713 sta_priv->tlc_amsdu = false; 1714 else 1715 sta_priv->tlc_amsdu = true; 1716 } 1717 1718 /* 1719 * setup rate table in uCode 1720 */ 1721 static void rs_update_rate_tbl(struct iwl_mvm *mvm, 1722 struct ieee80211_sta *sta, 1723 struct iwl_lq_sta *lq_sta, 1724 struct iwl_scale_tbl_info *tbl) 1725 { 1726 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate); 1727 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false); 1728 } 1729 1730 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm, 1731 struct ieee80211_sta *sta, 1732 struct iwl_lq_sta *lq_sta, 1733 struct iwl_scale_tbl_info *tbl, 1734 enum rs_action scale_action) 1735 { 1736 if (sta->bandwidth != IEEE80211_STA_RX_BW_80) 1737 return false; 1738 1739 if (!is_vht_siso(&tbl->rate)) 1740 return false; 1741 1742 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) && 1743 (tbl->rate.index == IWL_RATE_MCS_0_INDEX) && 1744 (scale_action == RS_ACTION_DOWNSCALE)) { 1745 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20; 1746 tbl->rate.index = IWL_RATE_MCS_4_INDEX; 1747 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n"); 1748 goto tweaked; 1749 } 1750 1751 /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is 1752 * sustainable, i.e. we're past the test window. We can't go back 1753 * if MCS5 is just tested as this will happen always after switching 1754 * to 20Mhz MCS4 because the rate stats are cleared. 1755 */ 1756 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) && 1757 (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) && 1758 (scale_action == RS_ACTION_STAY)) || 1759 ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) && 1760 (scale_action == RS_ACTION_UPSCALE)))) { 1761 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80; 1762 tbl->rate.index = IWL_RATE_MCS_1_INDEX; 1763 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n"); 1764 goto tweaked; 1765 } 1766 1767 return false; 1768 1769 tweaked: 1770 rs_set_expected_tpt_table(lq_sta, tbl); 1771 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1772 return true; 1773 } 1774 1775 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm, 1776 struct iwl_lq_sta *lq_sta, 1777 struct ieee80211_sta *sta, 1778 struct iwl_scale_tbl_info *tbl) 1779 { 1780 int i, j, max_rate; 1781 enum rs_column next_col_id; 1782 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column]; 1783 const struct rs_tx_column *next_col; 1784 allow_column_func_t allow_func; 1785 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm); 1786 const u16 *expected_tpt_tbl; 1787 u16 tpt, max_expected_tpt; 1788 1789 for (i = 0; i < MAX_NEXT_COLUMNS; i++) { 1790 next_col_id = curr_col->next_columns[i]; 1791 1792 if (next_col_id == RS_COLUMN_INVALID) 1793 continue; 1794 1795 if (lq_sta->visited_columns & BIT(next_col_id)) { 1796 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n", 1797 next_col_id); 1798 continue; 1799 } 1800 1801 next_col = &rs_tx_columns[next_col_id]; 1802 1803 if (!rs_is_valid_ant(valid_ants, next_col->ant)) { 1804 IWL_DEBUG_RATE(mvm, 1805 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n", 1806 next_col_id, valid_ants, next_col->ant); 1807 continue; 1808 } 1809 1810 for (j = 0; j < MAX_COLUMN_CHECKS; j++) { 1811 allow_func = next_col->checks[j]; 1812 if (allow_func && !allow_func(mvm, sta, &tbl->rate, 1813 next_col)) 1814 break; 1815 } 1816 1817 if (j != MAX_COLUMN_CHECKS) { 1818 IWL_DEBUG_RATE(mvm, 1819 "Skip column %d: not allowed (check %d failed)\n", 1820 next_col_id, j); 1821 1822 continue; 1823 } 1824 1825 tpt = lq_sta->last_tpt / 100; 1826 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col, 1827 rs_bw_from_sta_bw(sta)); 1828 if (WARN_ON_ONCE(!expected_tpt_tbl)) 1829 continue; 1830 1831 max_rate = rs_get_max_allowed_rate(lq_sta, next_col); 1832 if (max_rate == IWL_RATE_INVALID) { 1833 IWL_DEBUG_RATE(mvm, 1834 "Skip column %d: no rate is allowed in this column\n", 1835 next_col_id); 1836 continue; 1837 } 1838 1839 max_expected_tpt = expected_tpt_tbl[max_rate]; 1840 if (tpt >= max_expected_tpt) { 1841 IWL_DEBUG_RATE(mvm, 1842 "Skip column %d: can't beat current TPT. Max expected %d current %d\n", 1843 next_col_id, max_expected_tpt, tpt); 1844 continue; 1845 } 1846 1847 IWL_DEBUG_RATE(mvm, 1848 "Found potential column %d. Max expected %d current %d\n", 1849 next_col_id, max_expected_tpt, tpt); 1850 break; 1851 } 1852 1853 if (i == MAX_NEXT_COLUMNS) 1854 return RS_COLUMN_INVALID; 1855 1856 return next_col_id; 1857 } 1858 1859 static int rs_switch_to_column(struct iwl_mvm *mvm, 1860 struct iwl_lq_sta *lq_sta, 1861 struct ieee80211_sta *sta, 1862 enum rs_column col_id) 1863 { 1864 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1865 struct iwl_scale_tbl_info *search_tbl = 1866 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 1867 struct rs_rate *rate = &search_tbl->rate; 1868 const struct rs_tx_column *column = &rs_tx_columns[col_id]; 1869 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column]; 1870 u32 sz = (sizeof(struct iwl_scale_tbl_info) - 1871 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); 1872 unsigned long rate_mask = 0; 1873 u32 rate_idx = 0; 1874 1875 memcpy(search_tbl, tbl, sz); 1876 1877 rate->sgi = column->sgi; 1878 rate->ant = column->ant; 1879 1880 if (column->mode == RS_LEGACY) { 1881 if (lq_sta->band == NL80211_BAND_5GHZ) 1882 rate->type = LQ_LEGACY_A; 1883 else 1884 rate->type = LQ_LEGACY_G; 1885 1886 rate->bw = RATE_MCS_CHAN_WIDTH_20; 1887 rate->ldpc = false; 1888 rate_mask = lq_sta->active_legacy_rate; 1889 } else if (column->mode == RS_SISO) { 1890 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; 1891 rate_mask = lq_sta->active_siso_rate; 1892 } else if (column->mode == RS_MIMO2) { 1893 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; 1894 rate_mask = lq_sta->active_mimo2_rate; 1895 } else { 1896 WARN_ONCE(1, "Bad column mode"); 1897 } 1898 1899 if (column->mode != RS_LEGACY) { 1900 rate->bw = rs_bw_from_sta_bw(sta); 1901 rate->ldpc = lq_sta->ldpc; 1902 } 1903 1904 search_tbl->column = col_id; 1905 rs_set_expected_tpt_table(lq_sta, search_tbl); 1906 1907 lq_sta->visited_columns |= BIT(col_id); 1908 1909 /* Get the best matching rate if we're changing modes. e.g. 1910 * SISO->MIMO, LEGACY->SISO, MIMO->SISO 1911 */ 1912 if (curr_column->mode != column->mode) { 1913 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl, 1914 rate_mask, rate->index); 1915 1916 if ((rate_idx == IWL_RATE_INVALID) || 1917 !(BIT(rate_idx) & rate_mask)) { 1918 IWL_DEBUG_RATE(mvm, 1919 "can not switch with index %d" 1920 " rate mask %lx\n", 1921 rate_idx, rate_mask); 1922 1923 goto err; 1924 } 1925 1926 rate->index = rate_idx; 1927 } 1928 1929 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n", 1930 col_id, rate->index); 1931 1932 return 0; 1933 1934 err: 1935 rate->type = LQ_NONE; 1936 return -1; 1937 } 1938 1939 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm, 1940 struct iwl_scale_tbl_info *tbl, 1941 s32 sr, int low, int high, 1942 int current_tpt, 1943 int low_tpt, int high_tpt) 1944 { 1945 enum rs_action action = RS_ACTION_STAY; 1946 1947 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) || 1948 (current_tpt == 0)) { 1949 IWL_DEBUG_RATE(mvm, 1950 "Decrease rate because of low SR\n"); 1951 return RS_ACTION_DOWNSCALE; 1952 } 1953 1954 if ((low_tpt == IWL_INVALID_VALUE) && 1955 (high_tpt == IWL_INVALID_VALUE) && 1956 (high != IWL_RATE_INVALID)) { 1957 IWL_DEBUG_RATE(mvm, 1958 "No data about high/low rates. Increase rate\n"); 1959 return RS_ACTION_UPSCALE; 1960 } 1961 1962 if ((high_tpt == IWL_INVALID_VALUE) && 1963 (high != IWL_RATE_INVALID) && 1964 (low_tpt != IWL_INVALID_VALUE) && 1965 (low_tpt < current_tpt)) { 1966 IWL_DEBUG_RATE(mvm, 1967 "No data about high rate and low rate is worse. Increase rate\n"); 1968 return RS_ACTION_UPSCALE; 1969 } 1970 1971 if ((high_tpt != IWL_INVALID_VALUE) && 1972 (high_tpt > current_tpt)) { 1973 IWL_DEBUG_RATE(mvm, 1974 "Higher rate is better. Increate rate\n"); 1975 return RS_ACTION_UPSCALE; 1976 } 1977 1978 if ((low_tpt != IWL_INVALID_VALUE) && 1979 (high_tpt != IWL_INVALID_VALUE) && 1980 (low_tpt < current_tpt) && 1981 (high_tpt < current_tpt)) { 1982 IWL_DEBUG_RATE(mvm, 1983 "Both high and low are worse. Maintain rate\n"); 1984 return RS_ACTION_STAY; 1985 } 1986 1987 if ((low_tpt != IWL_INVALID_VALUE) && 1988 (low_tpt > current_tpt)) { 1989 IWL_DEBUG_RATE(mvm, 1990 "Lower rate is better\n"); 1991 action = RS_ACTION_DOWNSCALE; 1992 goto out; 1993 } 1994 1995 if ((low_tpt == IWL_INVALID_VALUE) && 1996 (low != IWL_RATE_INVALID)) { 1997 IWL_DEBUG_RATE(mvm, 1998 "No data about lower rate\n"); 1999 action = RS_ACTION_DOWNSCALE; 2000 goto out; 2001 } 2002 2003 IWL_DEBUG_RATE(mvm, "Maintain rate\n"); 2004 2005 out: 2006 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) { 2007 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { 2008 IWL_DEBUG_RATE(mvm, 2009 "SR is above NO DECREASE. Avoid downscale\n"); 2010 action = RS_ACTION_STAY; 2011 } else if (current_tpt > (100 * tbl->expected_tpt[low])) { 2012 IWL_DEBUG_RATE(mvm, 2013 "Current TPT is higher than max expected in low rate. Avoid downscale\n"); 2014 action = RS_ACTION_STAY; 2015 } else { 2016 IWL_DEBUG_RATE(mvm, "Decrease rate\n"); 2017 } 2018 } 2019 2020 return action; 2021 } 2022 2023 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 2024 struct iwl_lq_sta *lq_sta) 2025 { 2026 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which 2027 * supports STBC of at least 1*SS 2028 */ 2029 if (!lq_sta->stbc_capable) 2030 return false; 2031 2032 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 2033 return false; 2034 2035 return true; 2036 } 2037 2038 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index, 2039 int *weaker, int *stronger) 2040 { 2041 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP; 2042 if (*weaker > TPC_MAX_REDUCTION) 2043 *weaker = TPC_INVALID; 2044 2045 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP; 2046 if (*stronger < 0) 2047 *stronger = TPC_INVALID; 2048 } 2049 2050 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif, 2051 struct rs_rate *rate, enum nl80211_band band) 2052 { 2053 int index = rate->index; 2054 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM); 2055 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION && 2056 !vif->bss_conf.ps); 2057 2058 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n", 2059 cam, sta_ps_disabled); 2060 /* 2061 * allow tpc only if power management is enabled, or bt coex 2062 * activity grade allows it and we are on 2.4Ghz. 2063 */ 2064 if ((cam || sta_ps_disabled) && 2065 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band)) 2066 return false; 2067 2068 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type); 2069 if (is_legacy(rate)) 2070 return index == IWL_RATE_54M_INDEX; 2071 if (is_ht(rate)) 2072 return index == IWL_RATE_MCS_7_INDEX; 2073 if (is_vht(rate)) 2074 return index == IWL_RATE_MCS_7_INDEX || 2075 index == IWL_RATE_MCS_8_INDEX || 2076 index == IWL_RATE_MCS_9_INDEX; 2077 2078 WARN_ON_ONCE(1); 2079 return false; 2080 } 2081 2082 enum tpc_action { 2083 TPC_ACTION_STAY, 2084 TPC_ACTION_DECREASE, 2085 TPC_ACTION_INCREASE, 2086 TPC_ACTION_NO_RESTIRCTION, 2087 }; 2088 2089 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm, 2090 s32 sr, int weak, int strong, 2091 int current_tpt, 2092 int weak_tpt, int strong_tpt) 2093 { 2094 /* stay until we have valid tpt */ 2095 if (current_tpt == IWL_INVALID_VALUE) { 2096 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n"); 2097 return TPC_ACTION_STAY; 2098 } 2099 2100 /* Too many failures, increase txp */ 2101 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) || 2102 current_tpt == 0) { 2103 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n"); 2104 return TPC_ACTION_NO_RESTIRCTION; 2105 } 2106 2107 /* try decreasing first if applicable */ 2108 if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) && 2109 weak != TPC_INVALID) { 2110 if (weak_tpt == IWL_INVALID_VALUE && 2111 (strong_tpt == IWL_INVALID_VALUE || 2112 current_tpt >= strong_tpt)) { 2113 IWL_DEBUG_RATE(mvm, 2114 "no weak txp measurement. decrease txp\n"); 2115 return TPC_ACTION_DECREASE; 2116 } 2117 2118 if (weak_tpt > current_tpt) { 2119 IWL_DEBUG_RATE(mvm, 2120 "lower txp has better tpt. decrease txp\n"); 2121 return TPC_ACTION_DECREASE; 2122 } 2123 } 2124 2125 /* next, increase if needed */ 2126 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) && 2127 strong != TPC_INVALID) { 2128 if (weak_tpt == IWL_INVALID_VALUE && 2129 strong_tpt != IWL_INVALID_VALUE && 2130 current_tpt < strong_tpt) { 2131 IWL_DEBUG_RATE(mvm, 2132 "higher txp has better tpt. increase txp\n"); 2133 return TPC_ACTION_INCREASE; 2134 } 2135 2136 if (weak_tpt < current_tpt && 2137 (strong_tpt == IWL_INVALID_VALUE || 2138 strong_tpt > current_tpt)) { 2139 IWL_DEBUG_RATE(mvm, 2140 "lower txp has worse tpt. increase txp\n"); 2141 return TPC_ACTION_INCREASE; 2142 } 2143 } 2144 2145 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n"); 2146 return TPC_ACTION_STAY; 2147 } 2148 2149 static bool rs_tpc_perform(struct iwl_mvm *mvm, 2150 struct ieee80211_sta *sta, 2151 struct iwl_lq_sta *lq_sta, 2152 struct iwl_scale_tbl_info *tbl) 2153 { 2154 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta); 2155 struct ieee80211_vif *vif = mvm_sta->vif; 2156 struct ieee80211_chanctx_conf *chanctx_conf; 2157 enum nl80211_band band; 2158 struct iwl_rate_scale_data *window; 2159 struct rs_rate *rate = &tbl->rate; 2160 enum tpc_action action; 2161 s32 sr; 2162 u8 cur = lq_sta->lq.reduced_tpc; 2163 int current_tpt; 2164 int weak, strong; 2165 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE; 2166 2167 #ifdef CONFIG_MAC80211_DEBUGFS 2168 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) { 2169 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n", 2170 lq_sta->pers.dbg_fixed_txp_reduction); 2171 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction; 2172 return cur != lq_sta->pers.dbg_fixed_txp_reduction; 2173 } 2174 #endif 2175 2176 rcu_read_lock(); 2177 chanctx_conf = rcu_dereference(vif->chanctx_conf); 2178 if (WARN_ON(!chanctx_conf)) 2179 band = NUM_NL80211_BANDS; 2180 else 2181 band = chanctx_conf->def.chan->band; 2182 rcu_read_unlock(); 2183 2184 if (!rs_tpc_allowed(mvm, vif, rate, band)) { 2185 IWL_DEBUG_RATE(mvm, 2186 "tpc is not allowed. remove txp restrictions\n"); 2187 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 2188 return cur != TPC_NO_REDUCTION; 2189 } 2190 2191 rs_get_adjacent_txp(mvm, cur, &weak, &strong); 2192 2193 /* Collect measured throughputs for current and adjacent rates */ 2194 window = tbl->tpc_win; 2195 sr = window[cur].success_ratio; 2196 current_tpt = window[cur].average_tpt; 2197 if (weak != TPC_INVALID) 2198 weak_tpt = window[weak].average_tpt; 2199 if (strong != TPC_INVALID) 2200 strong_tpt = window[strong].average_tpt; 2201 2202 IWL_DEBUG_RATE(mvm, 2203 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n", 2204 cur, current_tpt, sr, weak, strong, 2205 weak_tpt, strong_tpt); 2206 2207 action = rs_get_tpc_action(mvm, sr, weak, strong, 2208 current_tpt, weak_tpt, strong_tpt); 2209 2210 /* override actions if we are on the edge */ 2211 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) { 2212 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n"); 2213 action = TPC_ACTION_STAY; 2214 } else if (strong == TPC_INVALID && 2215 (action == TPC_ACTION_INCREASE || 2216 action == TPC_ACTION_NO_RESTIRCTION)) { 2217 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n"); 2218 action = TPC_ACTION_STAY; 2219 } 2220 2221 switch (action) { 2222 case TPC_ACTION_DECREASE: 2223 lq_sta->lq.reduced_tpc = weak; 2224 return true; 2225 case TPC_ACTION_INCREASE: 2226 lq_sta->lq.reduced_tpc = strong; 2227 return true; 2228 case TPC_ACTION_NO_RESTIRCTION: 2229 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 2230 return true; 2231 case TPC_ACTION_STAY: 2232 /* do nothing */ 2233 break; 2234 } 2235 return false; 2236 } 2237 2238 /* 2239 * Do rate scaling and search for new modulation mode. 2240 */ 2241 static void rs_rate_scale_perform(struct iwl_mvm *mvm, 2242 struct ieee80211_sta *sta, 2243 struct iwl_lq_sta *lq_sta, 2244 int tid, bool ndp) 2245 { 2246 int low = IWL_RATE_INVALID; 2247 int high = IWL_RATE_INVALID; 2248 int index; 2249 struct iwl_rate_scale_data *window = NULL; 2250 int current_tpt = IWL_INVALID_VALUE; 2251 int low_tpt = IWL_INVALID_VALUE; 2252 int high_tpt = IWL_INVALID_VALUE; 2253 u32 fail_count; 2254 enum rs_action scale_action = RS_ACTION_STAY; 2255 u16 rate_mask; 2256 u8 update_lq = 0; 2257 struct iwl_scale_tbl_info *tbl, *tbl1; 2258 u8 active_tbl = 0; 2259 u8 done_search = 0; 2260 u16 high_low; 2261 s32 sr; 2262 u8 prev_agg = lq_sta->is_agg; 2263 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta); 2264 struct iwl_mvm_tid_data *tid_data; 2265 struct rs_rate *rate; 2266 2267 lq_sta->is_agg = !!sta_priv->agg_tids; 2268 2269 /* 2270 * Select rate-scale / modulation-mode table to work with in 2271 * the rest of this function: "search" if searching for better 2272 * modulation mode, or "active" if doing rate scaling within a mode. 2273 */ 2274 if (!lq_sta->search_better_tbl) 2275 active_tbl = lq_sta->active_tbl; 2276 else 2277 active_tbl = 1 - lq_sta->active_tbl; 2278 2279 tbl = &(lq_sta->lq_info[active_tbl]); 2280 rate = &tbl->rate; 2281 2282 if (prev_agg != lq_sta->is_agg) { 2283 IWL_DEBUG_RATE(mvm, 2284 "Aggregation changed: prev %d current %d. Update expected TPT table\n", 2285 prev_agg, lq_sta->is_agg); 2286 rs_set_expected_tpt_table(lq_sta, tbl); 2287 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2288 } 2289 2290 /* current tx rate */ 2291 index = rate->index; 2292 2293 /* rates available for this association, and for modulation mode */ 2294 rate_mask = rs_get_supported_rates(lq_sta, rate); 2295 2296 if (!(BIT(index) & rate_mask)) { 2297 IWL_ERR(mvm, "Current Rate is not valid\n"); 2298 if (lq_sta->search_better_tbl) { 2299 /* revert to active table if search table is not valid*/ 2300 rate->type = LQ_NONE; 2301 lq_sta->search_better_tbl = 0; 2302 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 2303 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2304 } 2305 return; 2306 } 2307 2308 /* Get expected throughput table and history window for current rate */ 2309 if (!tbl->expected_tpt) { 2310 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n"); 2311 return; 2312 } 2313 2314 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2315 window = &(tbl->win[index]); 2316 2317 /* 2318 * If there is not enough history to calculate actual average 2319 * throughput, keep analyzing results of more tx frames, without 2320 * changing rate or mode (bypass most of the rest of this function). 2321 * Set up new rate table in uCode only if old rate is not supported 2322 * in current association (use new rate found above). 2323 */ 2324 fail_count = window->counter - window->success_counter; 2325 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) && 2326 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) { 2327 IWL_DEBUG_RATE(mvm, 2328 "%s: Test Window: succ %d total %d\n", 2329 rs_pretty_rate(rate), 2330 window->success_counter, window->counter); 2331 2332 /* Can't calculate this yet; not enough history */ 2333 window->average_tpt = IWL_INVALID_VALUE; 2334 2335 /* Should we stay with this modulation mode, 2336 * or search for a new one? */ 2337 rs_stay_in_table(lq_sta, false); 2338 2339 return; 2340 } 2341 2342 /* If we are searching for better modulation mode, check success. */ 2343 if (lq_sta->search_better_tbl) { 2344 /* If good success, continue using the "search" mode; 2345 * no need to send new link quality command, since we're 2346 * continuing to use the setup that we've been trying. */ 2347 if (window->average_tpt > lq_sta->last_tpt) { 2348 IWL_DEBUG_RATE(mvm, 2349 "SWITCHING TO NEW TABLE SR: %d " 2350 "cur-tpt %d old-tpt %d\n", 2351 window->success_ratio, 2352 window->average_tpt, 2353 lq_sta->last_tpt); 2354 2355 /* Swap tables; "search" becomes "active" */ 2356 lq_sta->active_tbl = active_tbl; 2357 current_tpt = window->average_tpt; 2358 /* Else poor success; go back to mode in "active" table */ 2359 } else { 2360 IWL_DEBUG_RATE(mvm, 2361 "GOING BACK TO THE OLD TABLE: SR %d " 2362 "cur-tpt %d old-tpt %d\n", 2363 window->success_ratio, 2364 window->average_tpt, 2365 lq_sta->last_tpt); 2366 2367 /* Nullify "search" table */ 2368 rate->type = LQ_NONE; 2369 2370 /* Revert to "active" table */ 2371 active_tbl = lq_sta->active_tbl; 2372 tbl = &(lq_sta->lq_info[active_tbl]); 2373 2374 /* Revert to "active" rate and throughput info */ 2375 index = tbl->rate.index; 2376 current_tpt = lq_sta->last_tpt; 2377 2378 /* Need to set up a new rate table in uCode */ 2379 update_lq = 1; 2380 } 2381 2382 /* Either way, we've made a decision; modulation mode 2383 * search is done, allow rate adjustment next time. */ 2384 lq_sta->search_better_tbl = 0; 2385 done_search = 1; /* Don't switch modes below! */ 2386 goto lq_update; 2387 } 2388 2389 /* (Else) not in search of better modulation mode, try for better 2390 * starting rate, while staying in this mode. */ 2391 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type); 2392 low = high_low & 0xff; 2393 high = (high_low >> 8) & 0xff; 2394 2395 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2396 2397 sr = window->success_ratio; 2398 2399 /* Collect measured throughputs for current and adjacent rates */ 2400 current_tpt = window->average_tpt; 2401 if (low != IWL_RATE_INVALID) 2402 low_tpt = tbl->win[low].average_tpt; 2403 if (high != IWL_RATE_INVALID) 2404 high_tpt = tbl->win[high].average_tpt; 2405 2406 IWL_DEBUG_RATE(mvm, 2407 "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n", 2408 rs_pretty_rate(rate), current_tpt, sr, 2409 low, high, low_tpt, high_tpt); 2410 2411 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high, 2412 current_tpt, low_tpt, high_tpt); 2413 2414 /* Force a search in case BT doesn't like us being in MIMO */ 2415 if (is_mimo(rate) && 2416 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) { 2417 IWL_DEBUG_RATE(mvm, 2418 "BT Coex forbids MIMO. Search for new config\n"); 2419 rs_stay_in_table(lq_sta, true); 2420 goto lq_update; 2421 } 2422 2423 switch (scale_action) { 2424 case RS_ACTION_DOWNSCALE: 2425 /* Decrease starting rate, update uCode's rate table */ 2426 if (low != IWL_RATE_INVALID) { 2427 update_lq = 1; 2428 index = low; 2429 } else { 2430 IWL_DEBUG_RATE(mvm, 2431 "At the bottom rate. Can't decrease\n"); 2432 } 2433 2434 break; 2435 case RS_ACTION_UPSCALE: 2436 /* Increase starting rate, update uCode's rate table */ 2437 if (high != IWL_RATE_INVALID) { 2438 update_lq = 1; 2439 index = high; 2440 } else { 2441 IWL_DEBUG_RATE(mvm, 2442 "At the top rate. Can't increase\n"); 2443 } 2444 2445 break; 2446 case RS_ACTION_STAY: 2447 /* No change */ 2448 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) 2449 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl); 2450 break; 2451 default: 2452 break; 2453 } 2454 2455 lq_update: 2456 /* Replace uCode's rate table for the destination station. */ 2457 if (update_lq) { 2458 tbl->rate.index = index; 2459 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK) 2460 rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action); 2461 rs_set_amsdu_len(mvm, sta, tbl, scale_action); 2462 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2463 } 2464 2465 rs_stay_in_table(lq_sta, false); 2466 2467 /* 2468 * Search for new modulation mode if we're: 2469 * 1) Not changing rates right now 2470 * 2) Not just finishing up a search 2471 * 3) Allowing a new search 2472 */ 2473 if (!update_lq && !done_search && 2474 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED 2475 && window->counter) { 2476 enum rs_column next_column; 2477 2478 /* Save current throughput to compare with "search" throughput*/ 2479 lq_sta->last_tpt = current_tpt; 2480 2481 IWL_DEBUG_RATE(mvm, 2482 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n", 2483 update_lq, done_search, lq_sta->rs_state, 2484 window->counter); 2485 2486 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl); 2487 if (next_column != RS_COLUMN_INVALID) { 2488 int ret = rs_switch_to_column(mvm, lq_sta, sta, 2489 next_column); 2490 if (!ret) 2491 lq_sta->search_better_tbl = 1; 2492 } else { 2493 IWL_DEBUG_RATE(mvm, 2494 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n"); 2495 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED; 2496 } 2497 2498 /* If new "search" mode was selected, set up in uCode table */ 2499 if (lq_sta->search_better_tbl) { 2500 /* Access the "search" table, clear its history. */ 2501 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 2502 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2503 2504 /* Use new "search" start rate */ 2505 index = tbl->rate.index; 2506 2507 rs_dump_rate(mvm, &tbl->rate, 2508 "Switch to SEARCH TABLE:"); 2509 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2510 } else { 2511 done_search = 1; 2512 } 2513 } 2514 2515 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) { 2516 /* If the "active" (non-search) mode was legacy, 2517 * and we've tried switching antennas, 2518 * but we haven't been able to try HT modes (not available), 2519 * stay with best antenna legacy modulation for a while 2520 * before next round of mode comparisons. */ 2521 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]); 2522 if (is_legacy(&tbl1->rate)) { 2523 IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n"); 2524 2525 if (tid != IWL_MAX_TID_COUNT) { 2526 tid_data = &sta_priv->tid_data[tid]; 2527 if (tid_data->state != IWL_AGG_OFF) { 2528 IWL_DEBUG_RATE(mvm, 2529 "Stop aggregation on tid %d\n", 2530 tid); 2531 ieee80211_stop_tx_ba_session(sta, tid); 2532 } 2533 } 2534 rs_set_stay_in_table(mvm, 1, lq_sta); 2535 } else { 2536 /* If we're in an HT mode, and all 3 mode switch actions 2537 * have been tried and compared, stay in this best modulation 2538 * mode for a while before next round of mode comparisons. */ 2539 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) && 2540 (lq_sta->tx_agg_tid_en & (1 << tid)) && 2541 (tid != IWL_MAX_TID_COUNT)) { 2542 tid_data = &sta_priv->tid_data[tid]; 2543 if (tid_data->state == IWL_AGG_OFF && !ndp) { 2544 IWL_DEBUG_RATE(mvm, 2545 "try to aggregate tid %d\n", 2546 tid); 2547 rs_tl_turn_on_agg(mvm, tid, 2548 lq_sta, sta); 2549 } 2550 } 2551 rs_set_stay_in_table(mvm, 0, lq_sta); 2552 } 2553 } 2554 } 2555 2556 struct rs_init_rate_info { 2557 s8 rssi; 2558 u8 rate_idx; 2559 }; 2560 2561 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = { 2562 { -60, IWL_RATE_54M_INDEX }, 2563 { -64, IWL_RATE_48M_INDEX }, 2564 { -68, IWL_RATE_36M_INDEX }, 2565 { -80, IWL_RATE_24M_INDEX }, 2566 { -84, IWL_RATE_18M_INDEX }, 2567 { -85, IWL_RATE_12M_INDEX }, 2568 { -86, IWL_RATE_11M_INDEX }, 2569 { -88, IWL_RATE_5M_INDEX }, 2570 { -90, IWL_RATE_2M_INDEX }, 2571 { S8_MIN, IWL_RATE_1M_INDEX }, 2572 }; 2573 2574 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = { 2575 { -60, IWL_RATE_54M_INDEX }, 2576 { -64, IWL_RATE_48M_INDEX }, 2577 { -72, IWL_RATE_36M_INDEX }, 2578 { -80, IWL_RATE_24M_INDEX }, 2579 { -84, IWL_RATE_18M_INDEX }, 2580 { -85, IWL_RATE_12M_INDEX }, 2581 { -87, IWL_RATE_9M_INDEX }, 2582 { S8_MIN, IWL_RATE_6M_INDEX }, 2583 }; 2584 2585 static const struct rs_init_rate_info rs_optimal_rates_ht[] = { 2586 { -60, IWL_RATE_MCS_7_INDEX }, 2587 { -64, IWL_RATE_MCS_6_INDEX }, 2588 { -68, IWL_RATE_MCS_5_INDEX }, 2589 { -72, IWL_RATE_MCS_4_INDEX }, 2590 { -80, IWL_RATE_MCS_3_INDEX }, 2591 { -84, IWL_RATE_MCS_2_INDEX }, 2592 { -85, IWL_RATE_MCS_1_INDEX }, 2593 { S8_MIN, IWL_RATE_MCS_0_INDEX}, 2594 }; 2595 2596 /* MCS index 9 is not valid for 20MHz VHT channel width, 2597 * but is ok for 40, 80 and 160MHz channels. 2598 */ 2599 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = { 2600 { -60, IWL_RATE_MCS_8_INDEX }, 2601 { -64, IWL_RATE_MCS_7_INDEX }, 2602 { -68, IWL_RATE_MCS_6_INDEX }, 2603 { -72, IWL_RATE_MCS_5_INDEX }, 2604 { -80, IWL_RATE_MCS_4_INDEX }, 2605 { -84, IWL_RATE_MCS_3_INDEX }, 2606 { -85, IWL_RATE_MCS_2_INDEX }, 2607 { -87, IWL_RATE_MCS_1_INDEX }, 2608 { S8_MIN, IWL_RATE_MCS_0_INDEX}, 2609 }; 2610 2611 static const struct rs_init_rate_info rs_optimal_rates_vht[] = { 2612 { -60, IWL_RATE_MCS_9_INDEX }, 2613 { -64, IWL_RATE_MCS_8_INDEX }, 2614 { -68, IWL_RATE_MCS_7_INDEX }, 2615 { -72, IWL_RATE_MCS_6_INDEX }, 2616 { -80, IWL_RATE_MCS_5_INDEX }, 2617 { -84, IWL_RATE_MCS_4_INDEX }, 2618 { -85, IWL_RATE_MCS_3_INDEX }, 2619 { -87, IWL_RATE_MCS_2_INDEX }, 2620 { -88, IWL_RATE_MCS_1_INDEX }, 2621 { S8_MIN, IWL_RATE_MCS_0_INDEX }, 2622 }; 2623 2624 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */ 2625 2626 /* Init the optimal rate based on STA caps 2627 * This combined with rssi is used to report the last tx rate 2628 * to userspace when we haven't transmitted enough frames. 2629 */ 2630 static void rs_init_optimal_rate(struct iwl_mvm *mvm, 2631 struct ieee80211_sta *sta, 2632 struct iwl_lq_sta *lq_sta) 2633 { 2634 struct rs_rate *rate = &lq_sta->optimal_rate; 2635 2636 if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID) 2637 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; 2638 else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID) 2639 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; 2640 else if (lq_sta->band == NL80211_BAND_5GHZ) 2641 rate->type = LQ_LEGACY_A; 2642 else 2643 rate->type = LQ_LEGACY_G; 2644 2645 rate->bw = rs_bw_from_sta_bw(sta); 2646 rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL); 2647 2648 /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */ 2649 2650 if (is_mimo(rate)) { 2651 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate; 2652 } else if (is_siso(rate)) { 2653 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate; 2654 } else { 2655 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate; 2656 2657 if (lq_sta->band == NL80211_BAND_5GHZ) { 2658 lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy; 2659 lq_sta->optimal_nentries = 2660 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy); 2661 } else { 2662 lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy; 2663 lq_sta->optimal_nentries = 2664 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy); 2665 } 2666 } 2667 2668 if (is_vht(rate)) { 2669 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) { 2670 lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz; 2671 lq_sta->optimal_nentries = 2672 ARRAY_SIZE(rs_optimal_rates_vht_20mhz); 2673 } else { 2674 lq_sta->optimal_rates = rs_optimal_rates_vht; 2675 lq_sta->optimal_nentries = 2676 ARRAY_SIZE(rs_optimal_rates_vht); 2677 } 2678 } else if (is_ht(rate)) { 2679 lq_sta->optimal_rates = rs_optimal_rates_ht; 2680 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht); 2681 } 2682 } 2683 2684 /* Compute the optimal rate index based on RSSI */ 2685 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm, 2686 struct iwl_lq_sta *lq_sta) 2687 { 2688 struct rs_rate *rate = &lq_sta->optimal_rate; 2689 int i; 2690 2691 rate->index = find_first_bit(&lq_sta->optimal_rate_mask, 2692 BITS_PER_LONG); 2693 2694 for (i = 0; i < lq_sta->optimal_nentries; i++) { 2695 int rate_idx = lq_sta->optimal_rates[i].rate_idx; 2696 2697 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) && 2698 (BIT(rate_idx) & lq_sta->optimal_rate_mask)) { 2699 rate->index = rate_idx; 2700 break; 2701 } 2702 } 2703 2704 return rate; 2705 } 2706 2707 /* Choose an initial legacy rate and antenna to use based on the RSSI 2708 * of last Rx 2709 */ 2710 static void rs_get_initial_rate(struct iwl_mvm *mvm, 2711 struct ieee80211_sta *sta, 2712 struct iwl_lq_sta *lq_sta, 2713 enum nl80211_band band, 2714 struct rs_rate *rate) 2715 { 2716 int i, nentries; 2717 unsigned long active_rate; 2718 s8 best_rssi = S8_MIN; 2719 u8 best_ant = ANT_NONE; 2720 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 2721 const struct rs_init_rate_info *initial_rates; 2722 2723 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { 2724 if (!(lq_sta->pers.chains & BIT(i))) 2725 continue; 2726 2727 if (lq_sta->pers.chain_signal[i] > best_rssi) { 2728 best_rssi = lq_sta->pers.chain_signal[i]; 2729 best_ant = BIT(i); 2730 } 2731 } 2732 2733 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n", 2734 rs_pretty_ant(best_ant), best_rssi); 2735 2736 if (best_ant != ANT_A && best_ant != ANT_B) 2737 rate->ant = first_antenna(valid_tx_ant); 2738 else 2739 rate->ant = best_ant; 2740 2741 rate->sgi = false; 2742 rate->ldpc = false; 2743 rate->bw = RATE_MCS_CHAN_WIDTH_20; 2744 2745 rate->index = find_first_bit(&lq_sta->active_legacy_rate, 2746 BITS_PER_LONG); 2747 2748 if (band == NL80211_BAND_5GHZ) { 2749 rate->type = LQ_LEGACY_A; 2750 initial_rates = rs_optimal_rates_5ghz_legacy; 2751 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy); 2752 } else { 2753 rate->type = LQ_LEGACY_G; 2754 initial_rates = rs_optimal_rates_24ghz_legacy; 2755 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy); 2756 } 2757 2758 if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE) 2759 goto out; 2760 2761 /* Start from a higher rate if the corresponding debug capability 2762 * is enabled. The rate is chosen according to AP capabilities. 2763 * In case of VHT/HT when the rssi is low fallback to the case of 2764 * legacy rates. 2765 */ 2766 if (sta->vht_cap.vht_supported && 2767 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { 2768 switch (sta->bandwidth) { 2769 case IEEE80211_STA_RX_BW_160: 2770 case IEEE80211_STA_RX_BW_80: 2771 case IEEE80211_STA_RX_BW_40: 2772 initial_rates = rs_optimal_rates_vht; 2773 nentries = ARRAY_SIZE(rs_optimal_rates_vht); 2774 break; 2775 case IEEE80211_STA_RX_BW_20: 2776 initial_rates = rs_optimal_rates_vht_20mhz; 2777 nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz); 2778 break; 2779 default: 2780 IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth); 2781 goto out; 2782 } 2783 2784 active_rate = lq_sta->active_siso_rate; 2785 rate->type = LQ_VHT_SISO; 2786 rate->bw = rs_bw_from_sta_bw(sta); 2787 } else if (sta->ht_cap.ht_supported && 2788 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { 2789 initial_rates = rs_optimal_rates_ht; 2790 nentries = ARRAY_SIZE(rs_optimal_rates_ht); 2791 active_rate = lq_sta->active_siso_rate; 2792 rate->type = LQ_HT_SISO; 2793 } else { 2794 active_rate = lq_sta->active_legacy_rate; 2795 } 2796 2797 for (i = 0; i < nentries; i++) { 2798 int rate_idx = initial_rates[i].rate_idx; 2799 2800 if ((best_rssi >= initial_rates[i].rssi) && 2801 (BIT(rate_idx) & active_rate)) { 2802 rate->index = rate_idx; 2803 break; 2804 } 2805 } 2806 2807 out: 2808 rs_dump_rate(mvm, rate, "INITIAL"); 2809 } 2810 2811 /* Save info about RSSI of last Rx */ 2812 void rs_update_last_rssi(struct iwl_mvm *mvm, 2813 struct iwl_lq_sta *lq_sta, 2814 struct ieee80211_rx_status *rx_status) 2815 { 2816 int i; 2817 2818 lq_sta->pers.chains = rx_status->chains; 2819 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0]; 2820 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1]; 2821 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2]; 2822 lq_sta->pers.last_rssi = S8_MIN; 2823 2824 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { 2825 if (!(lq_sta->pers.chains & BIT(i))) 2826 continue; 2827 2828 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi) 2829 lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i]; 2830 } 2831 } 2832 2833 /** 2834 * rs_initialize_lq - Initialize a station's hardware rate table 2835 * 2836 * The uCode's station table contains a table of fallback rates 2837 * for automatic fallback during transmission. 2838 * 2839 * NOTE: This sets up a default set of values. These will be replaced later 2840 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of 2841 * rc80211_simple. 2842 * 2843 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before 2844 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD, 2845 * which requires station table entry to exist). 2846 */ 2847 static void rs_initialize_lq(struct iwl_mvm *mvm, 2848 struct ieee80211_sta *sta, 2849 struct iwl_lq_sta *lq_sta, 2850 enum nl80211_band band, 2851 bool init) 2852 { 2853 struct iwl_scale_tbl_info *tbl; 2854 struct rs_rate *rate; 2855 u8 active_tbl = 0; 2856 2857 if (!sta || !lq_sta) 2858 return; 2859 2860 if (!lq_sta->search_better_tbl) 2861 active_tbl = lq_sta->active_tbl; 2862 else 2863 active_tbl = 1 - lq_sta->active_tbl; 2864 2865 tbl = &(lq_sta->lq_info[active_tbl]); 2866 rate = &tbl->rate; 2867 2868 rs_get_initial_rate(mvm, sta, lq_sta, band, rate); 2869 rs_init_optimal_rate(mvm, sta, lq_sta); 2870 2871 WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B); 2872 tbl->column = rs_get_column_from_rate(rate); 2873 2874 rs_set_expected_tpt_table(lq_sta, tbl); 2875 rs_fill_lq_cmd(mvm, sta, lq_sta, rate); 2876 /* TODO restore station should remember the lq cmd */ 2877 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init); 2878 } 2879 2880 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta, 2881 struct ieee80211_tx_rate_control *txrc) 2882 { 2883 struct sk_buff *skb = txrc->skb; 2884 struct iwl_op_mode *op_mode __maybe_unused = 2885 (struct iwl_op_mode *)mvm_r; 2886 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 2887 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2888 struct iwl_lq_sta *lq_sta = mvm_sta; 2889 struct rs_rate *optimal_rate; 2890 u32 last_ucode_rate; 2891 2892 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) { 2893 /* if vif isn't initialized mvm doesn't know about 2894 * this station, so don't do anything with the it 2895 */ 2896 sta = NULL; 2897 mvm_sta = NULL; 2898 } 2899 2900 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2901 2902 /* Treat uninitialized rate scaling data same as non-existing. */ 2903 if (lq_sta && !lq_sta->pers.drv) { 2904 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n"); 2905 mvm_sta = NULL; 2906 } 2907 2908 /* Send management frames and NO_ACK data using lowest rate. */ 2909 if (rate_control_send_low(sta, mvm_sta, txrc)) 2910 return; 2911 2912 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags, 2913 info->band, &info->control.rates[0]); 2914 info->control.rates[0].count = 1; 2915 2916 /* Report the optimal rate based on rssi and STA caps if we haven't 2917 * converged yet (too little traffic) or exploring other modulations 2918 */ 2919 if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) { 2920 optimal_rate = rs_get_optimal_rate(mvm, lq_sta); 2921 last_ucode_rate = ucode_rate_from_rs_rate(mvm, 2922 optimal_rate); 2923 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band, 2924 &txrc->reported_rate); 2925 } 2926 } 2927 2928 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta, 2929 gfp_t gfp) 2930 { 2931 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta); 2932 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate; 2933 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 2934 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta; 2935 2936 IWL_DEBUG_RATE(mvm, "create station rate scale window\n"); 2937 2938 lq_sta->pers.drv = mvm; 2939 #ifdef CONFIG_MAC80211_DEBUGFS 2940 lq_sta->pers.dbg_fixed_rate = 0; 2941 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID; 2942 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 2943 #endif 2944 lq_sta->pers.chains = 0; 2945 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal)); 2946 lq_sta->pers.last_rssi = S8_MIN; 2947 2948 return &sta_priv->lq_sta; 2949 } 2950 2951 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap, 2952 int nss) 2953 { 2954 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) & 2955 (0x3 << (2 * (nss - 1))); 2956 rx_mcs >>= (2 * (nss - 1)); 2957 2958 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7) 2959 return IWL_RATE_MCS_7_INDEX; 2960 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8) 2961 return IWL_RATE_MCS_8_INDEX; 2962 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9) 2963 return IWL_RATE_MCS_9_INDEX; 2964 2965 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED); 2966 return -1; 2967 } 2968 2969 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta, 2970 struct ieee80211_sta_vht_cap *vht_cap, 2971 struct iwl_lq_sta *lq_sta) 2972 { 2973 int i; 2974 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1); 2975 2976 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 2977 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 2978 if (i == IWL_RATE_9M_INDEX) 2979 continue; 2980 2981 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 2982 if (i == IWL_RATE_MCS_9_INDEX && 2983 sta->bandwidth == IEEE80211_STA_RX_BW_20) 2984 continue; 2985 2986 lq_sta->active_siso_rate |= BIT(i); 2987 } 2988 } 2989 2990 if (sta->rx_nss < 2) 2991 return; 2992 2993 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2); 2994 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 2995 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 2996 if (i == IWL_RATE_9M_INDEX) 2997 continue; 2998 2999 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 3000 if (i == IWL_RATE_MCS_9_INDEX && 3001 sta->bandwidth == IEEE80211_STA_RX_BW_20) 3002 continue; 3003 3004 lq_sta->active_mimo2_rate |= BIT(i); 3005 } 3006 } 3007 } 3008 3009 static void rs_ht_init(struct iwl_mvm *mvm, 3010 struct ieee80211_sta *sta, 3011 struct iwl_lq_sta *lq_sta, 3012 struct ieee80211_sta_ht_cap *ht_cap) 3013 { 3014 /* active_siso_rate mask includes 9 MBits (bit 5), 3015 * and CCK (bits 0-3), supp_rates[] does not; 3016 * shift to convert format, force 9 MBits off. 3017 */ 3018 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1; 3019 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1; 3020 lq_sta->active_siso_rate &= ~((u16)0x2); 3021 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE; 3022 3023 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1; 3024 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1; 3025 lq_sta->active_mimo2_rate &= ~((u16)0x2); 3026 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE; 3027 3028 if (mvm->cfg->ht_params->ldpc && 3029 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING)) 3030 lq_sta->ldpc = true; 3031 3032 if (mvm->cfg->ht_params->stbc && 3033 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 3034 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC)) 3035 lq_sta->stbc_capable = true; 3036 3037 lq_sta->is_vht = false; 3038 } 3039 3040 static void rs_vht_init(struct iwl_mvm *mvm, 3041 struct ieee80211_sta *sta, 3042 struct iwl_lq_sta *lq_sta, 3043 struct ieee80211_sta_vht_cap *vht_cap) 3044 { 3045 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta); 3046 3047 if (mvm->cfg->ht_params->ldpc && 3048 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC)) 3049 lq_sta->ldpc = true; 3050 3051 if (mvm->cfg->ht_params->stbc && 3052 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 3053 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK)) 3054 lq_sta->stbc_capable = true; 3055 3056 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) && 3057 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 3058 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE)) 3059 lq_sta->bfer_capable = true; 3060 3061 lq_sta->is_vht = true; 3062 } 3063 3064 #ifdef CONFIG_IWLWIFI_DEBUGFS 3065 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm) 3066 { 3067 spin_lock_bh(&mvm->drv_stats_lock); 3068 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats)); 3069 spin_unlock_bh(&mvm->drv_stats_lock); 3070 } 3071 3072 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg) 3073 { 3074 u8 nss = 0, mcs = 0; 3075 3076 spin_lock(&mvm->drv_stats_lock); 3077 3078 if (agg) 3079 mvm->drv_rx_stats.agg_frames++; 3080 3081 mvm->drv_rx_stats.success_frames++; 3082 3083 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { 3084 case RATE_MCS_CHAN_WIDTH_20: 3085 mvm->drv_rx_stats.bw_20_frames++; 3086 break; 3087 case RATE_MCS_CHAN_WIDTH_40: 3088 mvm->drv_rx_stats.bw_40_frames++; 3089 break; 3090 case RATE_MCS_CHAN_WIDTH_80: 3091 mvm->drv_rx_stats.bw_80_frames++; 3092 break; 3093 case RATE_MCS_CHAN_WIDTH_160: 3094 mvm->drv_rx_stats.bw_160_frames++; 3095 break; 3096 default: 3097 WARN_ONCE(1, "bad BW. rate 0x%x", rate); 3098 } 3099 3100 if (rate & RATE_MCS_HT_MSK) { 3101 mvm->drv_rx_stats.ht_frames++; 3102 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK; 3103 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1; 3104 } else if (rate & RATE_MCS_VHT_MSK) { 3105 mvm->drv_rx_stats.vht_frames++; 3106 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK; 3107 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >> 3108 RATE_VHT_MCS_NSS_POS) + 1; 3109 } else { 3110 mvm->drv_rx_stats.legacy_frames++; 3111 } 3112 3113 if (nss == 1) 3114 mvm->drv_rx_stats.siso_frames++; 3115 else if (nss == 2) 3116 mvm->drv_rx_stats.mimo2_frames++; 3117 3118 if (rate & RATE_MCS_SGI_MSK) 3119 mvm->drv_rx_stats.sgi_frames++; 3120 else 3121 mvm->drv_rx_stats.ngi_frames++; 3122 3123 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate; 3124 mvm->drv_rx_stats.last_frame_idx = 3125 (mvm->drv_rx_stats.last_frame_idx + 1) % 3126 ARRAY_SIZE(mvm->drv_rx_stats.last_rates); 3127 3128 spin_unlock(&mvm->drv_stats_lock); 3129 } 3130 #endif 3131 3132 /* 3133 * Called after adding a new station to initialize rate scaling 3134 */ 3135 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 3136 enum nl80211_band band, bool init) 3137 { 3138 int i, j; 3139 struct ieee80211_hw *hw = mvm->hw; 3140 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 3141 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; 3142 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta); 3143 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta; 3144 struct ieee80211_supported_band *sband; 3145 unsigned long supp; /* must be unsigned long for for_each_set_bit */ 3146 3147 /* clear all non-persistent lq data */ 3148 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers)); 3149 3150 sband = hw->wiphy->bands[band]; 3151 3152 lq_sta->lq.sta_id = sta_priv->sta_id; 3153 sta_priv->tlc_amsdu = false; 3154 3155 for (j = 0; j < LQ_SIZE; j++) 3156 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]); 3157 3158 lq_sta->flush_timer = 0; 3159 lq_sta->last_tx = jiffies; 3160 3161 IWL_DEBUG_RATE(mvm, 3162 "LQ: *** rate scale station global init for station %d ***\n", 3163 sta_priv->sta_id); 3164 /* TODO: what is a good starting rate for STA? About middle? Maybe not 3165 * the lowest or the highest rate.. Could consider using RSSI from 3166 * previous packets? Need to have IEEE 802.1X auth succeed immediately 3167 * after assoc.. */ 3168 3169 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX; 3170 lq_sta->band = sband->band; 3171 /* 3172 * active legacy rates as per supported rates bitmap 3173 */ 3174 supp = sta->supp_rates[sband->band]; 3175 lq_sta->active_legacy_rate = 0; 3176 for_each_set_bit(i, &supp, BITS_PER_LONG) 3177 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value); 3178 3179 /* TODO: should probably account for rx_highest for both HT/VHT */ 3180 if (!vht_cap || !vht_cap->vht_supported) 3181 rs_ht_init(mvm, sta, lq_sta, ht_cap); 3182 else 3183 rs_vht_init(mvm, sta, lq_sta, vht_cap); 3184 3185 lq_sta->max_legacy_rate_idx = 3186 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate); 3187 lq_sta->max_siso_rate_idx = 3188 rs_get_max_rate_from_mask(lq_sta->active_siso_rate); 3189 lq_sta->max_mimo2_rate_idx = 3190 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate); 3191 3192 IWL_DEBUG_RATE(mvm, 3193 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n", 3194 lq_sta->active_legacy_rate, 3195 lq_sta->active_siso_rate, 3196 lq_sta->active_mimo2_rate, 3197 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable, 3198 lq_sta->bfer_capable); 3199 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n", 3200 lq_sta->max_legacy_rate_idx, 3201 lq_sta->max_siso_rate_idx, 3202 lq_sta->max_mimo2_rate_idx); 3203 3204 /* These values will be overridden later */ 3205 lq_sta->lq.single_stream_ant_msk = 3206 first_antenna(iwl_mvm_get_valid_tx_ant(mvm)); 3207 lq_sta->lq.dual_stream_ant_msk = ANT_AB; 3208 3209 /* as default allow aggregation for all tids */ 3210 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID; 3211 lq_sta->is_agg = 0; 3212 #ifdef CONFIG_IWLWIFI_DEBUGFS 3213 iwl_mvm_reset_frame_stats(mvm); 3214 #endif 3215 rs_initialize_lq(mvm, sta, lq_sta, band, init); 3216 } 3217 3218 static void rs_rate_update(void *mvm_r, 3219 struct ieee80211_supported_band *sband, 3220 struct cfg80211_chan_def *chandef, 3221 struct ieee80211_sta *sta, void *priv_sta, 3222 u32 changed) 3223 { 3224 u8 tid; 3225 struct iwl_op_mode *op_mode = 3226 (struct iwl_op_mode *)mvm_r; 3227 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 3228 3229 if (!iwl_mvm_sta_from_mac80211(sta)->vif) 3230 return; 3231 3232 /* Stop any ongoing aggregations as rs starts off assuming no agg */ 3233 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++) 3234 ieee80211_stop_tx_ba_session(sta, tid); 3235 3236 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false); 3237 } 3238 3239 #ifdef CONFIG_MAC80211_DEBUGFS 3240 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm, 3241 struct iwl_lq_cmd *lq_cmd, 3242 enum nl80211_band band, 3243 u32 ucode_rate) 3244 { 3245 struct rs_rate rate; 3246 int i; 3247 int num_rates = ARRAY_SIZE(lq_cmd->rs_table); 3248 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate); 3249 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; 3250 3251 for (i = 0; i < num_rates; i++) 3252 lq_cmd->rs_table[i] = ucode_rate_le32; 3253 3254 rs_rate_from_ucode_rate(ucode_rate, band, &rate); 3255 3256 if (is_mimo(&rate)) 3257 lq_cmd->mimo_delim = num_rates - 1; 3258 else 3259 lq_cmd->mimo_delim = 0; 3260 3261 lq_cmd->reduced_tpc = 0; 3262 3263 if (num_of_ant(ant) == 1) 3264 lq_cmd->single_stream_ant_msk = ant; 3265 3266 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF; 3267 } 3268 #endif /* CONFIG_MAC80211_DEBUGFS */ 3269 3270 static void rs_fill_rates_for_column(struct iwl_mvm *mvm, 3271 struct iwl_lq_sta *lq_sta, 3272 struct rs_rate *rate, 3273 __le32 *rs_table, int *rs_table_index, 3274 int num_rates, int num_retries, 3275 u8 valid_tx_ant, bool toggle_ant) 3276 { 3277 int i, j; 3278 __le32 ucode_rate; 3279 bool bottom_reached = false; 3280 int prev_rate_idx = rate->index; 3281 int end = LINK_QUAL_MAX_RETRY_NUM; 3282 int index = *rs_table_index; 3283 3284 for (i = 0; i < num_rates && index < end; i++) { 3285 for (j = 0; j < num_retries && index < end; j++, index++) { 3286 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm, 3287 rate)); 3288 rs_table[index] = ucode_rate; 3289 if (toggle_ant) 3290 rs_toggle_antenna(valid_tx_ant, rate); 3291 } 3292 3293 prev_rate_idx = rate->index; 3294 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate); 3295 if (bottom_reached && !is_legacy(rate)) 3296 break; 3297 } 3298 3299 if (!bottom_reached && !is_legacy(rate)) 3300 rate->index = prev_rate_idx; 3301 3302 *rs_table_index = index; 3303 } 3304 3305 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI 3306 * column the rate table should look like this: 3307 * 3308 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 3309 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 3310 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 3311 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 3312 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 3313 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 3314 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI 3315 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI 3316 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI 3317 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps 3318 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps 3319 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps 3320 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps 3321 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps 3322 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps 3323 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps 3324 */ 3325 static void rs_build_rates_table(struct iwl_mvm *mvm, 3326 struct ieee80211_sta *sta, 3327 struct iwl_lq_sta *lq_sta, 3328 const struct rs_rate *initial_rate) 3329 { 3330 struct rs_rate rate; 3331 int num_rates, num_retries, index = 0; 3332 u8 valid_tx_ant = 0; 3333 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3334 bool toggle_ant = false; 3335 3336 memcpy(&rate, initial_rate, sizeof(rate)); 3337 3338 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 3339 3340 /* TODO: remove old API when min FW API hits 14 */ 3341 if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) && 3342 rs_stbc_allow(mvm, sta, lq_sta)) 3343 rate.stbc = true; 3344 3345 if (is_siso(&rate)) { 3346 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES; 3347 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3348 } else if (is_mimo(&rate)) { 3349 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES; 3350 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3351 } else { 3352 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES; 3353 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES; 3354 toggle_ant = true; 3355 } 3356 3357 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3358 num_rates, num_retries, valid_tx_ant, 3359 toggle_ant); 3360 3361 rs_get_lower_rate_down_column(lq_sta, &rate); 3362 3363 if (is_siso(&rate)) { 3364 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES; 3365 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES; 3366 lq_cmd->mimo_delim = index; 3367 } else if (is_legacy(&rate)) { 3368 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3369 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3370 } else { 3371 WARN_ON_ONCE(1); 3372 } 3373 3374 toggle_ant = true; 3375 3376 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3377 num_rates, num_retries, valid_tx_ant, 3378 toggle_ant); 3379 3380 rs_get_lower_rate_down_column(lq_sta, &rate); 3381 3382 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3383 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3384 3385 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3386 num_rates, num_retries, valid_tx_ant, 3387 toggle_ant); 3388 3389 } 3390 3391 struct rs_bfer_active_iter_data { 3392 struct ieee80211_sta *exclude_sta; 3393 struct iwl_mvm_sta *bfer_mvmsta; 3394 }; 3395 3396 static void rs_bfer_active_iter(void *_data, 3397 struct ieee80211_sta *sta) 3398 { 3399 struct rs_bfer_active_iter_data *data = _data; 3400 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3401 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq; 3402 u32 ss_params = le32_to_cpu(lq_cmd->ss_params); 3403 3404 if (sta == data->exclude_sta) 3405 return; 3406 3407 /* The current sta has BFER allowed */ 3408 if (ss_params & LQ_SS_BFER_ALLOWED) { 3409 WARN_ON_ONCE(data->bfer_mvmsta != NULL); 3410 3411 data->bfer_mvmsta = mvmsta; 3412 } 3413 } 3414 3415 static int rs_bfer_priority(struct iwl_mvm_sta *sta) 3416 { 3417 int prio = -1; 3418 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif); 3419 3420 switch (viftype) { 3421 case NL80211_IFTYPE_AP: 3422 case NL80211_IFTYPE_P2P_GO: 3423 prio = 3; 3424 break; 3425 case NL80211_IFTYPE_P2P_CLIENT: 3426 prio = 2; 3427 break; 3428 case NL80211_IFTYPE_STATION: 3429 prio = 1; 3430 break; 3431 default: 3432 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id); 3433 prio = -1; 3434 } 3435 3436 return prio; 3437 } 3438 3439 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */ 3440 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1, 3441 struct iwl_mvm_sta *sta2) 3442 { 3443 int prio1 = rs_bfer_priority(sta1); 3444 int prio2 = rs_bfer_priority(sta2); 3445 3446 if (prio1 > prio2) 3447 return 1; 3448 if (prio1 < prio2) 3449 return -1; 3450 return 0; 3451 } 3452 3453 static void rs_set_lq_ss_params(struct iwl_mvm *mvm, 3454 struct ieee80211_sta *sta, 3455 struct iwl_lq_sta *lq_sta, 3456 const struct rs_rate *initial_rate) 3457 { 3458 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3459 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3460 struct rs_bfer_active_iter_data data = { 3461 .exclude_sta = sta, 3462 .bfer_mvmsta = NULL, 3463 }; 3464 struct iwl_mvm_sta *bfer_mvmsta = NULL; 3465 u32 ss_params = LQ_SS_PARAMS_VALID; 3466 3467 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 3468 goto out; 3469 3470 #ifdef CONFIG_MAC80211_DEBUGFS 3471 /* Check if forcing the decision is configured. 3472 * Note that SISO is forced by not allowing STBC or BFER 3473 */ 3474 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC) 3475 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE); 3476 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER) 3477 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE); 3478 3479 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) { 3480 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n", 3481 lq_sta->pers.ss_force); 3482 goto out; 3483 } 3484 #endif 3485 3486 if (lq_sta->stbc_capable) 3487 ss_params |= LQ_SS_STBC_1SS_ALLOWED; 3488 3489 if (!lq_sta->bfer_capable) 3490 goto out; 3491 3492 ieee80211_iterate_stations_atomic(mvm->hw, 3493 rs_bfer_active_iter, 3494 &data); 3495 bfer_mvmsta = data.bfer_mvmsta; 3496 3497 /* This code is safe as it doesn't run concurrently for different 3498 * stations. This is guaranteed by the fact that calls to 3499 * ieee80211_tx_status wouldn't run concurrently for a single HW. 3500 */ 3501 if (!bfer_mvmsta) { 3502 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n"); 3503 3504 ss_params |= LQ_SS_BFER_ALLOWED; 3505 goto out; 3506 } 3507 3508 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n", 3509 bfer_mvmsta->sta_id); 3510 3511 /* Disallow BFER on another STA if active and we're a higher priority */ 3512 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) { 3513 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq; 3514 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params); 3515 3516 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED; 3517 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params); 3518 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false); 3519 3520 ss_params |= LQ_SS_BFER_ALLOWED; 3521 IWL_DEBUG_RATE(mvm, 3522 "Lower priority BFER sta found (%d). Switch BFER\n", 3523 bfer_mvmsta->sta_id); 3524 } 3525 out: 3526 lq_cmd->ss_params = cpu_to_le32(ss_params); 3527 } 3528 3529 static void rs_fill_lq_cmd(struct iwl_mvm *mvm, 3530 struct ieee80211_sta *sta, 3531 struct iwl_lq_sta *lq_sta, 3532 const struct rs_rate *initial_rate) 3533 { 3534 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3535 struct iwl_mvm_sta *mvmsta; 3536 struct iwl_mvm_vif *mvmvif; 3537 3538 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START; 3539 lq_cmd->agg_time_limit = 3540 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT); 3541 3542 #ifdef CONFIG_MAC80211_DEBUGFS 3543 if (lq_sta->pers.dbg_fixed_rate) { 3544 rs_build_rates_table_from_fixed(mvm, lq_cmd, 3545 lq_sta->band, 3546 lq_sta->pers.dbg_fixed_rate); 3547 return; 3548 } 3549 #endif 3550 if (WARN_ON_ONCE(!sta || !initial_rate)) 3551 return; 3552 3553 rs_build_rates_table(mvm, sta, lq_sta, initial_rate); 3554 3555 if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS)) 3556 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate); 3557 3558 mvmsta = iwl_mvm_sta_from_mac80211(sta); 3559 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif); 3560 3561 if (num_of_ant(initial_rate->ant) == 1) 3562 lq_cmd->single_stream_ant_msk = initial_rate->ant; 3563 3564 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize; 3565 3566 /* 3567 * In case of low latency, tell the firmware to leave a frame in the 3568 * Tx Fifo so that it can start a transaction in the same TxOP. This 3569 * basically allows the firmware to send bursts. 3570 */ 3571 if (iwl_mvm_vif_low_latency(mvmvif)) 3572 lq_cmd->agg_frame_cnt_limit--; 3573 3574 if (mvmsta->vif->p2p) 3575 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK; 3576 3577 lq_cmd->agg_time_limit = 3578 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta)); 3579 } 3580 3581 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) 3582 { 3583 return hw->priv; 3584 } 3585 /* rate scale requires free function to be implemented */ 3586 static void rs_free(void *mvm_rate) 3587 { 3588 return; 3589 } 3590 3591 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, 3592 void *mvm_sta) 3593 { 3594 struct iwl_op_mode *op_mode __maybe_unused = mvm_r; 3595 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 3596 3597 IWL_DEBUG_RATE(mvm, "enter\n"); 3598 IWL_DEBUG_RATE(mvm, "leave\n"); 3599 } 3600 3601 #ifdef CONFIG_MAC80211_DEBUGFS 3602 int rs_pretty_print_rate(char *buf, const u32 rate) 3603 { 3604 3605 char *type, *bw; 3606 u8 mcs = 0, nss = 0; 3607 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; 3608 3609 if (!(rate & RATE_MCS_HT_MSK) && 3610 !(rate & RATE_MCS_VHT_MSK)) { 3611 int index = iwl_hwrate_to_plcp_idx(rate); 3612 3613 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n", 3614 rs_pretty_ant(ant), 3615 index == IWL_RATE_INVALID ? "BAD" : 3616 iwl_rate_mcs[index].mbps); 3617 } 3618 3619 if (rate & RATE_MCS_VHT_MSK) { 3620 type = "VHT"; 3621 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK; 3622 nss = ((rate & RATE_VHT_MCS_NSS_MSK) 3623 >> RATE_VHT_MCS_NSS_POS) + 1; 3624 } else if (rate & RATE_MCS_HT_MSK) { 3625 type = "HT"; 3626 mcs = rate & RATE_HT_MCS_INDEX_MSK; 3627 } else { 3628 type = "Unknown"; /* shouldn't happen */ 3629 } 3630 3631 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { 3632 case RATE_MCS_CHAN_WIDTH_20: 3633 bw = "20Mhz"; 3634 break; 3635 case RATE_MCS_CHAN_WIDTH_40: 3636 bw = "40Mhz"; 3637 break; 3638 case RATE_MCS_CHAN_WIDTH_80: 3639 bw = "80Mhz"; 3640 break; 3641 case RATE_MCS_CHAN_WIDTH_160: 3642 bw = "160Mhz"; 3643 break; 3644 default: 3645 bw = "BAD BW"; 3646 } 3647 3648 return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n", 3649 type, rs_pretty_ant(ant), bw, mcs, nss, 3650 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ", 3651 (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "", 3652 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "", 3653 (rate & RATE_MCS_BF_MSK) ? "BF " : "", 3654 (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : ""); 3655 } 3656 3657 /** 3658 * Program the device to use fixed rate for frame transmit 3659 * This is for debugging/testing only 3660 * once the device start use fixed rate, we need to reload the module 3661 * to being back the normal operation. 3662 */ 3663 static void rs_program_fix_rate(struct iwl_mvm *mvm, 3664 struct iwl_lq_sta *lq_sta) 3665 { 3666 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */ 3667 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3668 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3669 3670 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n", 3671 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate); 3672 3673 if (lq_sta->pers.dbg_fixed_rate) { 3674 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL); 3675 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false); 3676 } 3677 } 3678 3679 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file, 3680 const char __user *user_buf, size_t count, loff_t *ppos) 3681 { 3682 struct iwl_lq_sta *lq_sta = file->private_data; 3683 struct iwl_mvm *mvm; 3684 char buf[64]; 3685 size_t buf_size; 3686 u32 parsed_rate; 3687 3688 mvm = lq_sta->pers.drv; 3689 memset(buf, 0, sizeof(buf)); 3690 buf_size = min(count, sizeof(buf) - 1); 3691 if (copy_from_user(buf, user_buf, buf_size)) 3692 return -EFAULT; 3693 3694 if (sscanf(buf, "%x", &parsed_rate) == 1) 3695 lq_sta->pers.dbg_fixed_rate = parsed_rate; 3696 else 3697 lq_sta->pers.dbg_fixed_rate = 0; 3698 3699 rs_program_fix_rate(mvm, lq_sta); 3700 3701 return count; 3702 } 3703 3704 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file, 3705 char __user *user_buf, size_t count, loff_t *ppos) 3706 { 3707 char *buff; 3708 int desc = 0; 3709 int i = 0; 3710 ssize_t ret; 3711 3712 struct iwl_lq_sta *lq_sta = file->private_data; 3713 struct iwl_mvm_sta *mvmsta = 3714 container_of(lq_sta, struct iwl_mvm_sta, lq_sta); 3715 struct iwl_mvm *mvm; 3716 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 3717 struct rs_rate *rate = &tbl->rate; 3718 u32 ss_params; 3719 3720 mvm = lq_sta->pers.drv; 3721 buff = kmalloc(2048, GFP_KERNEL); 3722 if (!buff) 3723 return -ENOMEM; 3724 3725 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id); 3726 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n", 3727 lq_sta->total_failed, lq_sta->total_success, 3728 lq_sta->active_legacy_rate); 3729 desc += sprintf(buff+desc, "fixed rate 0x%X\n", 3730 lq_sta->pers.dbg_fixed_rate); 3731 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n", 3732 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "", 3733 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "", 3734 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : ""); 3735 desc += sprintf(buff+desc, "lq type %s\n", 3736 (is_legacy(rate)) ? "legacy" : 3737 is_vht(rate) ? "VHT" : "HT"); 3738 if (!is_legacy(rate)) { 3739 desc += sprintf(buff + desc, " %s", 3740 (is_siso(rate)) ? "SISO" : "MIMO2"); 3741 desc += sprintf(buff + desc, " %s", 3742 (is_ht20(rate)) ? "20MHz" : 3743 (is_ht40(rate)) ? "40MHz" : 3744 (is_ht80(rate)) ? "80MHz" : 3745 (is_ht160(rate)) ? "160MHz" : "BAD BW"); 3746 desc += sprintf(buff + desc, " %s %s %s %s\n", 3747 (rate->sgi) ? "SGI" : "NGI", 3748 (rate->ldpc) ? "LDPC" : "BCC", 3749 (lq_sta->is_agg) ? "AGG on" : "", 3750 (mvmsta->tlc_amsdu) ? "AMSDU on" : ""); 3751 } 3752 desc += sprintf(buff+desc, "last tx rate=0x%X\n", 3753 lq_sta->last_rate_n_flags); 3754 desc += sprintf(buff+desc, 3755 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n", 3756 lq_sta->lq.flags, 3757 lq_sta->lq.mimo_delim, 3758 lq_sta->lq.single_stream_ant_msk, 3759 lq_sta->lq.dual_stream_ant_msk); 3760 3761 desc += sprintf(buff+desc, 3762 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n", 3763 le16_to_cpu(lq_sta->lq.agg_time_limit), 3764 lq_sta->lq.agg_disable_start_th, 3765 lq_sta->lq.agg_frame_cnt_limit); 3766 3767 desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc); 3768 ss_params = le32_to_cpu(lq_sta->lq.ss_params); 3769 desc += sprintf(buff+desc, "single stream params: %s%s%s%s\n", 3770 (ss_params & LQ_SS_PARAMS_VALID) ? 3771 "VALID" : "INVALID", 3772 (ss_params & LQ_SS_BFER_ALLOWED) ? 3773 ", BFER" : "", 3774 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ? 3775 ", STBC" : "", 3776 (ss_params & LQ_SS_FORCE) ? 3777 ", FORCE" : ""); 3778 desc += sprintf(buff+desc, 3779 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n", 3780 lq_sta->lq.initial_rate_index[0], 3781 lq_sta->lq.initial_rate_index[1], 3782 lq_sta->lq.initial_rate_index[2], 3783 lq_sta->lq.initial_rate_index[3]); 3784 3785 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) { 3786 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]); 3787 3788 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r); 3789 desc += rs_pretty_print_rate(buff+desc, r); 3790 } 3791 3792 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3793 kfree(buff); 3794 return ret; 3795 } 3796 3797 static const struct file_operations rs_sta_dbgfs_scale_table_ops = { 3798 .write = rs_sta_dbgfs_scale_table_write, 3799 .read = rs_sta_dbgfs_scale_table_read, 3800 .open = simple_open, 3801 .llseek = default_llseek, 3802 }; 3803 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file, 3804 char __user *user_buf, size_t count, loff_t *ppos) 3805 { 3806 char *buff; 3807 int desc = 0; 3808 int i, j; 3809 ssize_t ret; 3810 struct iwl_scale_tbl_info *tbl; 3811 struct rs_rate *rate; 3812 struct iwl_lq_sta *lq_sta = file->private_data; 3813 3814 buff = kmalloc(1024, GFP_KERNEL); 3815 if (!buff) 3816 return -ENOMEM; 3817 3818 for (i = 0; i < LQ_SIZE; i++) { 3819 tbl = &(lq_sta->lq_info[i]); 3820 rate = &tbl->rate; 3821 desc += sprintf(buff+desc, 3822 "%s type=%d SGI=%d BW=%s DUP=0\n" 3823 "index=%d\n", 3824 lq_sta->active_tbl == i ? "*" : "x", 3825 rate->type, 3826 rate->sgi, 3827 is_ht20(rate) ? "20MHz" : 3828 is_ht40(rate) ? "40MHz" : 3829 is_ht80(rate) ? "80MHz" : 3830 is_ht160(rate) ? "160MHz" : "ERR", 3831 rate->index); 3832 for (j = 0; j < IWL_RATE_COUNT; j++) { 3833 desc += sprintf(buff+desc, 3834 "counter=%d success=%d %%=%d\n", 3835 tbl->win[j].counter, 3836 tbl->win[j].success_counter, 3837 tbl->win[j].success_ratio); 3838 } 3839 } 3840 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3841 kfree(buff); 3842 return ret; 3843 } 3844 3845 static const struct file_operations rs_sta_dbgfs_stats_table_ops = { 3846 .read = rs_sta_dbgfs_stats_table_read, 3847 .open = simple_open, 3848 .llseek = default_llseek, 3849 }; 3850 3851 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file, 3852 char __user *user_buf, 3853 size_t count, loff_t *ppos) 3854 { 3855 static const char * const column_name[] = { 3856 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A", 3857 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B", 3858 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A", 3859 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B", 3860 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI", 3861 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI", 3862 [RS_COLUMN_MIMO2] = "MIMO2", 3863 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI", 3864 }; 3865 3866 static const char * const rate_name[] = { 3867 [IWL_RATE_1M_INDEX] = "1M", 3868 [IWL_RATE_2M_INDEX] = "2M", 3869 [IWL_RATE_5M_INDEX] = "5.5M", 3870 [IWL_RATE_11M_INDEX] = "11M", 3871 [IWL_RATE_6M_INDEX] = "6M|MCS0", 3872 [IWL_RATE_9M_INDEX] = "9M", 3873 [IWL_RATE_12M_INDEX] = "12M|MCS1", 3874 [IWL_RATE_18M_INDEX] = "18M|MCS2", 3875 [IWL_RATE_24M_INDEX] = "24M|MCS3", 3876 [IWL_RATE_36M_INDEX] = "36M|MCS4", 3877 [IWL_RATE_48M_INDEX] = "48M|MCS5", 3878 [IWL_RATE_54M_INDEX] = "54M|MCS6", 3879 [IWL_RATE_MCS_7_INDEX] = "MCS7", 3880 [IWL_RATE_MCS_8_INDEX] = "MCS8", 3881 [IWL_RATE_MCS_9_INDEX] = "MCS9", 3882 }; 3883 3884 char *buff, *pos, *endpos; 3885 int col, rate; 3886 ssize_t ret; 3887 struct iwl_lq_sta *lq_sta = file->private_data; 3888 struct rs_rate_stats *stats; 3889 static const size_t bufsz = 1024; 3890 3891 buff = kmalloc(bufsz, GFP_KERNEL); 3892 if (!buff) 3893 return -ENOMEM; 3894 3895 pos = buff; 3896 endpos = pos + bufsz; 3897 3898 pos += scnprintf(pos, endpos - pos, "COLUMN,"); 3899 for (rate = 0; rate < IWL_RATE_COUNT; rate++) 3900 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]); 3901 pos += scnprintf(pos, endpos - pos, "\n"); 3902 3903 for (col = 0; col < RS_COLUMN_COUNT; col++) { 3904 pos += scnprintf(pos, endpos - pos, 3905 "%s,", column_name[col]); 3906 3907 for (rate = 0; rate < IWL_RATE_COUNT; rate++) { 3908 stats = &(lq_sta->pers.tx_stats[col][rate]); 3909 pos += scnprintf(pos, endpos - pos, 3910 "%llu/%llu,", 3911 stats->success, 3912 stats->total); 3913 } 3914 pos += scnprintf(pos, endpos - pos, "\n"); 3915 } 3916 3917 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff); 3918 kfree(buff); 3919 return ret; 3920 } 3921 3922 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file, 3923 const char __user *user_buf, 3924 size_t count, loff_t *ppos) 3925 { 3926 struct iwl_lq_sta *lq_sta = file->private_data; 3927 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats)); 3928 3929 return count; 3930 } 3931 3932 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = { 3933 .read = rs_sta_dbgfs_drv_tx_stats_read, 3934 .write = rs_sta_dbgfs_drv_tx_stats_write, 3935 .open = simple_open, 3936 .llseek = default_llseek, 3937 }; 3938 3939 static ssize_t iwl_dbgfs_ss_force_read(struct file *file, 3940 char __user *user_buf, 3941 size_t count, loff_t *ppos) 3942 { 3943 struct iwl_lq_sta *lq_sta = file->private_data; 3944 char buf[12]; 3945 int bufsz = sizeof(buf); 3946 int pos = 0; 3947 static const char * const ss_force_name[] = { 3948 [RS_SS_FORCE_NONE] = "none", 3949 [RS_SS_FORCE_STBC] = "stbc", 3950 [RS_SS_FORCE_BFER] = "bfer", 3951 [RS_SS_FORCE_SISO] = "siso", 3952 }; 3953 3954 pos += scnprintf(buf+pos, bufsz-pos, "%s\n", 3955 ss_force_name[lq_sta->pers.ss_force]); 3956 return simple_read_from_buffer(user_buf, count, ppos, buf, pos); 3957 } 3958 3959 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf, 3960 size_t count, loff_t *ppos) 3961 { 3962 struct iwl_mvm *mvm = lq_sta->pers.drv; 3963 int ret = 0; 3964 3965 if (!strncmp("none", buf, 4)) { 3966 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 3967 } else if (!strncmp("siso", buf, 4)) { 3968 lq_sta->pers.ss_force = RS_SS_FORCE_SISO; 3969 } else if (!strncmp("stbc", buf, 4)) { 3970 if (lq_sta->stbc_capable) { 3971 lq_sta->pers.ss_force = RS_SS_FORCE_STBC; 3972 } else { 3973 IWL_ERR(mvm, 3974 "can't force STBC. peer doesn't support\n"); 3975 ret = -EINVAL; 3976 } 3977 } else if (!strncmp("bfer", buf, 4)) { 3978 if (lq_sta->bfer_capable) { 3979 lq_sta->pers.ss_force = RS_SS_FORCE_BFER; 3980 } else { 3981 IWL_ERR(mvm, 3982 "can't force BFER. peer doesn't support\n"); 3983 ret = -EINVAL; 3984 } 3985 } else { 3986 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n"); 3987 ret = -EINVAL; 3988 } 3989 return ret ?: count; 3990 } 3991 3992 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \ 3993 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta) 3994 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \ 3995 if (!debugfs_create_file(#name, mode, parent, lq_sta, \ 3996 &iwl_dbgfs_##name##_ops)) \ 3997 goto err; \ 3998 } while (0) 3999 4000 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32); 4001 4002 static void rs_add_debugfs(void *mvm, void *priv_sta, struct dentry *dir) 4003 { 4004 struct iwl_lq_sta *lq_sta = priv_sta; 4005 struct iwl_mvm_sta *mvmsta; 4006 4007 mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta); 4008 4009 if (!mvmsta->vif) 4010 return; 4011 4012 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir, 4013 lq_sta, &rs_sta_dbgfs_scale_table_ops); 4014 debugfs_create_file("rate_stats_table", S_IRUSR, dir, 4015 lq_sta, &rs_sta_dbgfs_stats_table_ops); 4016 debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir, 4017 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops); 4018 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir, 4019 &lq_sta->tx_agg_tid_en); 4020 debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir, 4021 &lq_sta->pers.dbg_fixed_txp_reduction); 4022 4023 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR); 4024 return; 4025 err: 4026 IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n"); 4027 } 4028 4029 static void rs_remove_debugfs(void *mvm, void *mvm_sta) 4030 { 4031 } 4032 #endif 4033 4034 /* 4035 * Initialization of rate scaling information is done by driver after 4036 * the station is added. Since mac80211 calls this function before a 4037 * station is added we ignore it. 4038 */ 4039 static void rs_rate_init_stub(void *mvm_r, 4040 struct ieee80211_supported_band *sband, 4041 struct cfg80211_chan_def *chandef, 4042 struct ieee80211_sta *sta, void *mvm_sta) 4043 { 4044 } 4045 4046 static const struct rate_control_ops rs_mvm_ops = { 4047 .name = RS_NAME, 4048 .tx_status = rs_mac80211_tx_status, 4049 .get_rate = rs_get_rate, 4050 .rate_init = rs_rate_init_stub, 4051 .alloc = rs_alloc, 4052 .free = rs_free, 4053 .alloc_sta = rs_alloc_sta, 4054 .free_sta = rs_free_sta, 4055 .rate_update = rs_rate_update, 4056 #ifdef CONFIG_MAC80211_DEBUGFS 4057 .add_sta_debugfs = rs_add_debugfs, 4058 .remove_sta_debugfs = rs_remove_debugfs, 4059 #endif 4060 }; 4061 4062 int iwl_mvm_rate_control_register(void) 4063 { 4064 return ieee80211_rate_control_register(&rs_mvm_ops); 4065 } 4066 4067 void iwl_mvm_rate_control_unregister(void) 4068 { 4069 ieee80211_rate_control_unregister(&rs_mvm_ops); 4070 } 4071 4072 /** 4073 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable 4074 * Tx protection, according to this request and previous requests, 4075 * and send the LQ command. 4076 * @mvmsta: The station 4077 * @enable: Enable Tx protection? 4078 */ 4079 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 4080 bool enable) 4081 { 4082 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq; 4083 4084 lockdep_assert_held(&mvm->mutex); 4085 4086 if (enable) { 4087 if (mvmsta->tx_protection == 0) 4088 lq->flags |= LQ_FLAG_USE_RTS_MSK; 4089 mvmsta->tx_protection++; 4090 } else { 4091 mvmsta->tx_protection--; 4092 if (mvmsta->tx_protection == 0) 4093 lq->flags &= ~LQ_FLAG_USE_RTS_MSK; 4094 } 4095 4096 return iwl_mvm_send_lq_cmd(mvm, lq, false); 4097 } 4098